JPH0995710A - Spray device for spraying material for forming iron tapping runner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and precisely execute the repairing of worn position in the inner surface of an iron tapping runner in a short time by holding a spraying nozzle head so as to be freely swung and slid at the time of spraying a spraying material for repairing to a bed part and wall parts of an iron tapping runner of a blast furnace. SOLUTION: A spray unit 30 is held to the tip part of a boom 28 fitted to a mobile carriage so as to be freely attached/detached with a chucking device 33. The nozzle head 91 is held to this spray unit 30 through a head rotating device 80 so as to be freely swung and slid. This nozzle head 91 is set to the spray starting position of the bed part and the wall parts of the iron tapping runner. The spraying material and the water are forcedly bed respectively from a material hose 11 and a water hose 12 to the inner hole of a nozzle 90 of the nozzle head 91, kneaded and injected from the tip part of the nozzle. At this time, while leveling the ununiformity of the spraying material in the spraying range by circularly swinging the nozzle 90, the spraying range is gradually moved and widened to apply a working lining to the damaged part of the bed part and the wall parts of the iron tapping runner.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to hot metal from a blast furnace.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spraying material spraying device for forming a tapping metal gutter, which forms a working lining in contact with the so-called hot metal of a tapping gutter such as a large gutter through which a slag flows by spraying a spraying material.

[0002]

2. Description of the Related Art A schematic structure of a conventional taphole is shown in FIG. An outer shell portion A, which is the outermost shell of the taphole, is made of refractory brick, and a lining B made of a castable layer having a predetermined thickness and having a predetermined gutter shape is formed inside thereof. Since the part of the lining B with which the pig iron comes into contact gradually wears down, for example, when the tapping gutter has already been used for actual tapping and the wear of the lining B reaches a predetermined control value or more, 29, as shown in FIG. 29, the worn castable layer of the old lining B is dismantled and removed, and the inner frame C of the predetermined gutter shape is set inside thereof, and the inner frame C and the refractory brick are set. A flowable material called a casting material D is poured between the layer and the outer shell portion A, and the middle frame C is deframed in a state where the casting material D is solidified to some extent, and a burner or the like is used as necessary. The pouring material D is dried while being heated by using the heating means,
The lining B made of the castable layer is solidified and restored. When a new tappipe is newly created, it is started by setting the inner frame C after creating the outer shell portion A made of the refractory brick layer.

The lining B made of the castable layer of such a casting material generally has a low porosity, and therefore has a large bulk specific gravity and an excellent mechanical strength. Since the service life from construction or new construction to the next restoration construction is long, it is conventionally considered to be the most practical construction of a taphole gutter. For partial or local wear of the lining B made of the castable layer, a repair material called a spray material obtained by kneading an adhesive powder material with water is compared to the wear portion. It is sprayed with a relatively low discharge pressure to make an emergency repair. However, this conventional spraying material is generally considered to have a high porosity, a low bulk specific gravity, and cannot withstand actual tapping for a long time from the viewpoint of strength and wear rate, and it is not until the next restoration work. It is used as an emergency repair material. Of course, with such emergency repair, it is not possible to stop tapping for a long time, so in a relatively short time, that is, because the tapping gutter is still hot, spraying material is used for repair. This spraying construction is also called hot spraying construction.

As a device for performing such spraying work,
For example, there is one described in Japanese Patent Laid-Open No. 6-116611. This spraying equipment is installed on both sides of the gutter so that the gate-type frame is lifted by a crane to straddle the gutter, and a refractory supply tank is installed in the vicinity of the grate-type frame and fireproof. With the object supply tank connected with a supply hose or an air hose, the damage condition of the locally damaged part of the gutter can be accurately detected, and the nozzle provided on the gate frame can be automatically controlled according to the damage condition. By spraying the irregular-shaped refractory stored in the refractory supply tank, the hot repair work of the large gutter is semi-automatically performed by remote control.

[0005]

However, in the construction of the conventional taphole gutter and its restoration construction or new construction, for example, a middle frame is set, and in the restoration construction, the old lining is dismantled and removed. It takes a lot of time and effort to do so. Further, when the lining construction body is dried, as the porosity of the castable layer made of the casting material is low as described above, the volatile components of the casting material and the escape of non-volatile components that are to be vaporized by heating or heating. Therefore, the castable layer itself does not burst (also called explosion) due to the accumulation of these vaporized components or the expansion of the vaporized components due to heating, or the casting material dries rapidly. Therefore, it is necessary to slowly and slowly perform the process so that the volume may change and the cause of so-called shrinkage crack. Of course, the labor required during this period is also great. Furthermore, in the step of pouring the pouring material, as shown in FIG. 30, the personnel required for kneading the pouring material, the personnel for moving the same, the personnel for putting this into a bucket, mounting it, and constructing it. It can be seen that this requires a certain amount of time and effort. In this way, not only a great deal of time and labor is required for the construction and construction of the conventional tappipe, but also the unit price of the casting material is high and the amount of its use is large, so the overall cost is high. Moreover, since the tapping must be stopped for a long time, there are serious problems in terms of production efficiency and yield.

Therefore, it is conceivable to form the working lining by using an inexpensive spraying material which has been conventionally used as a repair material instead of the casting material. In this case,
As a result of various experiments, the inventors of the present invention showed that the discharge pressure of the spraying material was relatively high at 3 kgf / cm ² or more, and the nozzle tip was circularly swung to move laterally while spraying in a spiral shape.
It has been found that a precise working line can be formed and a working lining can be used instead of the casting material.

In order to form the working lining in this way, when spraying the spraying material at a high discharge pressure, it is almost impossible to spray the spraying material while manually holding the nozzle. As in the conventional example, a gate-type frame is placed so as to straddle a large gutter, and a refractory supply tank is installed in the vicinity of the structure, but this conventional method is used for partial repair of the large gutter. However, in the case of constructing the working lining continuously, it is necessary to move the gate-type frame itself along the gutter, which is suitable for spraying while reciprocating within a predetermined range. In addition, when there is an abnormality in the nozzle etc. provided in the gate type frame, it is necessary to remove the gate type frame from the track and repair the abnormal part such as the nozzle, and the repair time becomes long and it is great for spraying work. Influence there is an unsolved problem of giving.

Therefore, according to the present invention, when the working lining of the tappipe is formed of a spray material, when the nozzle or the like has an abnormality, it can be easily replaced and the repair time can be shortened. It is an object of the present invention to provide a spray material spraying device for forming a tappipe which can easily and accurately perform reciprocating spraying within a predetermined distance.

[0009]

Therefore, a spray material spraying device for forming a taphole gutter according to claim 1 of the present invention is a laying part and a wall part which come into contact with molten iron or the like of a taphole gutter of a blast furnace. In a spray material spraying device for forming a tappipe for spraying a predetermined spraying material with a predetermined discharge pressure onto a working lining, a self-propelled carriage having a boom and chucking at the boom tip of the self-propelled carriage. And a spraying unit removably held by the device, wherein the spraying unit has a structure for swingably and slidably holding at least a nozzle head for spraying the spraying material.

As described above, in the apparatus according to the first aspect, since the spraying unit is detachably supported by the chucking device on the boom of the self-propelled carriage, the spraying of the spraying material at a high discharge pressure is easy. In addition to being able to perform reliably, when an abnormality occurs in the spraying unit, the spraying unit is removed by the chucking device and a new spraying unit is attached, so that the abnormality of the spraying unit can be attached to the boom. It is possible to significantly reduce the interruption time of the spraying work as compared with the case of repairing.

[0012] According to a second aspect of the present invention, there is provided a spray material spraying device for forming a taphole gutter according to the first aspect of the invention, wherein the spraying unit holds a nozzle head so as to be rotatable, and the head rotating device. And a slide device that slidably holds the rotating device, and the slide device is held on the boom by a chucking device.

In the present invention, since the nozzle head can be slid in the predetermined direction by the slide mechanism and the nozzle head can be swung by the head rotating device, the self-propelled carriage can be stopped in the stopped state.
Spray construction can be automatically performed in the construction section of a predetermined length. Furthermore, in the spray material spraying device for forming a tappipe according to claim 3, in the invention of claim 1 or 2, the nozzle head drives a nozzle for discharging the spray material such that a tip of the nozzle head is circularly swirled. It is characterized in that it is equipped with a nozzle swiveling mechanism.

According to the third aspect of the present invention, since the tip of the nozzle is circularly swung by the nozzle swivel mechanism, the spray material can be spirally sprayed by moving the nozzle head in the predetermined direction. Furthermore, in the invention of claim 1 or 2, the spraying material spraying device for forming a tappipe according to claim 4 is characterized in that, in the invention of claim 1 or 2, the chucking device is detachable from a base part attached to a boom tip. A disassembled body, the base portion movably holds a plurality of balls in the radial direction, and a cam member for projecting the balls outward in the radial direction is slidably held in the vertical direction, and The body is characterized in that a ball storage portion for storing a part of the ball is formed.

In the present invention, the base and the divided body can be connected by a plurality of balls, and the connected state and the separated state can be easily switched by sliding the cam member in the vertical direction. Therefore, it is possible to easily and surely attach and detach the spraying unit.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of a tappipe construction apparatus according to the present invention will be described in detail with reference to the drawings. First,
FIG. 1 shows the overall configuration of the tappipe construction device of this embodiment.
This embodiment is mainly used for the construction of a large gutter part that flows before the hot metal sent out from the blast furnace is separated from the molten slag, and particularly, it is possible to exhibit sufficient mobility even in a complicated ground environment. A spraying vehicle 1 as a spraying material spraying device for forming a tappipe, in which a nozzle portion for spraying spraying material is provided on a single self-propelled carriage, and the spraying vehicle for sending the spraying material to the spraying vehicle 1. 1 and a spraying material supply device 2 for sending out spraying material, which is mounted on a carriage different from that of 1.

In the spraying material supply device 2, water is supplied from a fixed individual water supply source 3 via a water hose 4, and pressurized air is supplied from an individually installed air compressor 5 via an air hose 6. Also, electric power is supplied from a fixed individual power source 7 through a power panel 8 and a power cable 9. Further, the raw material of the spray material packed in the container bag 10 is put into the spray material supply device 2. On the other hand, to the spraying vehicle 1, the spraying material injected into the spraying material supply device 2 is pressure-fed by the pressurized air for air transportation supplied to the spraying material supply device 2 through the material hose 11. Further, water is supplied via the water hose 12 and electric power is supplied via the power cable 13, and at the same time, a control signal for controlling each device of the sprayed vehicle 1 is transmitted via the control cable 14.

The spraying vehicle 1 is a modification of an ordinary crawler type heavy machine as shown in FIG. 2, and a well-known hydraulic power source 23 is provided in a chassis 22 disposed above an existing caterpillar propulsion device 21. The chassis 22 that is installed and can rotate 360 ° in the lateral direction of the vehicle by a turning device 27 that includes a pinion 25 of a hydraulic motor 24 that operates with hydraulic pressure supplied from the hydraulic power source 23 and a ring gear 26. A boom 28 divided into three parts is attached to the front of the chassis 22 and hydraulic cylinders 29a, 29b, 29 are respectively attached to the booms 28.
It is possible to move the tip end portion of the boom 28 within a predetermined range within an arbitrary plane in the vehicle height direction by providing c.

A spraying unit 30 for spraying material as shown in FIG. 3 is attached to the tip of the boom 28. More specifically, the spraying unit 30 is attached via a chucking device 33 below a plate 32 installed so as to be always flat in the lateral direction of the vehicle by a parallel link 31 provided at the tip of the boom 28. Has been. The chucking device 33 will be described with reference to FIG. 4. The chuck 35 is a base 35 fixed horizontally to the plate 32 via a mounting plate 34, and the split body 3.
It is roughly divided into 6. First, the base portion 35 includes a hollow shaft portion 37 supported by the mounting plate 34, a sensor mounting member 38 joined to a flange portion 37a formed at a lower end portion of the hollow shaft portion 37, and the hollow shaft portion similarly. A cylindrical cylinder housing 39 attached to the flange portion 37a of the portion 37, a ball support member 40 fixed to the lower end portion of the cylinder housing 39 and closing the lower end opening of the cylinder 39a of the cylinder housing 39, and the cylinder A piston member 41 installed inside a cylinder 39a of the housing 39 and a cam member 4 fixed to a piston rod 42 projecting downward from the piston member 41 and pressing a ball 43 below the ball support member 40.
4 and these are integrally fastened by a bolt member 45.

Proximity switches 46a and 46b are attached to upper and lower portions of a cylindrical portion 38a projecting from the sensor mounting member 38 into the inner hole of the hollow shaft portion 37, and their signal lines are connected to the hollow shaft portion. It is connected to an external control device through the flange. Further, a sensor bar 47 screwed and fixed to the upper end of the piston member 41 and protruding upward from the upper end of the piston member 41 is passed through the sensor mounting member 38 into the inner hole of the cylindrical portion 38a, and the upper end thereof is provided. Is formed with a sensing portion 47a having an outer diameter larger than that. Further, pistons for supplying pressurized air are respectively lowered to the upper end of the cylinder 39a of the cylinder housing 39 closed by the sensor mounting member 38 and the lower end of the cylinder 39a closed by the ball support member 40. An air supply hole 39b and a piston raising air supply hole 39c are formed and are connected to an external pressurized air supply control device.

Further, the mounting flange portion 40 of the ball supporting member 40 mounted on the cylinder housing 39.
Two positioning pins 40b are projectingly provided on the lower end surface of a. In addition, through holes 40d are formed at a lower end portion of a cylindrical portion 40c extending downward from the ball support member 40 at predetermined circumferential directions, and the balls 43 are supported in the through holes 40d. There is. Further, the cam member 44 is fixed to the piston rod 42 penetrating into the inner hole of the cylindrical portion 40c of the ball support member 40 by the bolt member 45. The outer peripheral surface of the cam member 44 is A maximum outer diameter portion 44a tightly fitted into the inner hole of the cylindrical portion 40c, a step portion 44b having an outer diameter smaller than that, a slope portion 44c connecting the two, and a slope further tapered from the step portion 44b. The cam surface 44e is provided with a portion 44d, and the ball 43 is always in contact with the cam surface 44e. The joint between the sensor mounting member 38 and the cylinder housing 39, the penetrating portion of the sensor bar 47 into the sensor mounting member 38, the contact portion between the piston 41 and the inner wall of the cylinder, and the penetrating portion of the piston rod 42 into the ball supporting member 40. , And O-rings are respectively provided at the joints between the ball support member 40 and the cylinder housing 39 to prevent pressurized air supplied into the cylinder 39a from leaking, as will be described later.

On the other hand, the divided body 36 is formed in a thick ring shape, and a gear 48 for turning a spraying unit, which will be described later, is attached to the outer periphery of the divided body 36. Also, this divided body 3
6, the ball support member 40 of the base 35
From the position corresponding to the pin 40b protruding downward from
The lower end surface of the divided body 36 is reached and the pin 40b
A through hole 36a having an inner diameter for tightly fitting is formed. Further, on the inner hole surface of the divided body 36, a ball passing portion 36b having an inner diameter slightly larger than the outer diameter of the cylindrical portion 40c of the ball supporting member 40, a ball accommodating portion 36c having an inner diameter larger than that, and 36d connecting the
And a slope portion 36e having an inner diameter that decreases downward from the ball storage portion.

Therefore, first, in a state in which the split body 36 to which the gear 48 is fitted is separated from the base portion 35, pressurized air is supplied from the piston raising air supply hole 39c communicating with the lower end portion of the cylinder 39a. When supplied, the piston 41 rises as shown in the left half of FIG. 4, and the cam member 44 rises accordingly, so that the ball 43 supported by the ball support member 40 is at the lowermost end of the cam surface 44e. The ball 43 is drawn inward in the radial direction of the cylindrical portion 40c from the through hole 40d in which the ball 43 is supported so as to come into contact with the slope portion 44d. In addition, the piston 41 is connected to the cylinder 39a.
When it reaches the upper end of the
7a is disengaged from the upper proximity switch 46a,
The piston rising end can be detected from the signal.
In this state, the position of the through hole 36a of the divided body 36 in which the gear 48 is fitted is aligned with the position of the pin 40b protruding from the base portion 35, and the base portion 35 is placed in the inner hole of the divided body 36. When the divided body 36 is pushed up from below so as to insert the cylindrical portion 40c of the ball support member 40, the ball 43 is inserted into the ball passage portion 36b of the inner hole surface.
Since the ball 43 is drawn inward, the divided body 36 can be pushed up to a position where the ball 43 faces the ball storage portion 36c through the passage.

In this state, when pressurized air is supplied from the piston descending air supply hole 39b communicating with the upper end of the cylinder 39a, the piston 41 descends as shown in the right half of FIG. Since the cam member 44 descends, the ball 43 supported by the ball support member 40 passes through the step portion 44b of the cam surface 44e and the upper slope portion 44c so as to come into contact with the maximum outer diameter portion 44a. 43 is pushed out from the through hole 40d in which it is supported to the outside in the radial direction of the cylindrical portion 40c. Then, the ball 43 makes point contact with the housing portion 36c of the inner hole surface of the split body 36 and the two slope portions 36d and 36e, and at the same time, the cam surface 4
The slope portion 44c of 4e exhibits a wedge effect, and the cam member 44 and the divided body 36 are firmly fixed via the ball 43. When the piston 41 descends to the lower end of the cylinder 39a, the sensing portion 47a of the sensor bar 47 is disengaged from the lower proximity switch 46b, and the piston descending end can be detected from the signal.

In order to separate the divided body 36, to which the gear 48 is fitted, from the base portion 35 again, an operation may be carried out in the reverse order of the above procedure. At the time of replacement, if each divided unit 36 is attached to each spray unit 30 in advance, it is possible to replace it with a single touch, and when an abnormality occurs in the spray unit 30, repair it on site. By replacing the spraying unit 30 with a new spraying unit 30, it is possible to shorten the suspension time of the spraying work.

On the other hand, as mentioned above, the gear 48 is externally fitted to the divided body 36 of the chucking device 33. The gear 48 and the divided body 36 are fixed to the entire spray unit 30. In addition, the plate 3 on the side of the boom 28
2, a hydraulic motor 50 is arranged as shown in FIG. 3, and a pinion 51 attached to the rotary shaft of the hydraulic motor 50 meshes with a gear 48 on the spray unit 30 side. Therefore, when the hydraulic motor 50 is rotated, the entire spray unit 30 can be freely rotated in the lateral direction.

As shown in FIG. 3, the spraying unit 30 includes a slide device 60 attached to the lower end of the divided body 36 of the chucking device 33, and the slide device 6.
A head rotating device 80 attached to one end side of 0 and a nozzle 90 that is rotatably supported by the head rotating device 80 and ejects the spraying material are used as generatrix lines and the tip end portion of the nozzle is conical with a predetermined radius. And a nozzle head 91 for rotating.

Of these, first, the head slide device 60
Is a main body 61 having a U-shaped cross section in which both ends in the width direction hang down,
A slider 62 having an H-shaped cross section, which is inserted into the lower opening of the main body 61 and in which the flange portions 62a and 62b are provided so as to project in the vertical direction in the vertical direction, and the gear 48 is provided on the upper surface of the main body 61. And the split body 36 is fixed.
Further, a chain 63 is stretched over the upper flange portion 62a of the slider 62 along the length thereof, and both ends of the chain are slid through an existing chain tensioner 64 for adjusting the tension of the chain 63. It is connected to 62.

On the other hand, a hydraulic motor 65 is attached to the center of one widthwise end of the main body 61.
A sprocket 66 is attached to a rotary shaft 65a that projects through the opening of the main body 61. Rotating shafts are also arranged on both sides of the sprocket 66 via bearings, and sprotes 67 and 68 are attached to the rotating shafts so as to be in line with the sprocket 66 of the hydraulic motor 65. The chain 63 on the 62 includes a hydraulic motor 65 from below the sprocket 67 on one of the rotating shafts.
It is laid out so as to pass above the sprocket 66 and hang below the sprocket 68 of the other rotating shaft.

A support shaft 69 vertically facing the upper flange portion 62a of the slider 62 having the H-shaped cross section is provided from both longitudinal end portions of the both widthwise end portions hanging from the main body 61.
A roller 70 that abuts on the upper and lower surfaces of the upper flange portion 62a is rotatably attached to each support shaft 69 via a bearing (not shown). Also, the main body 6
From the both ends in the longitudinal direction of the both ends in the width direction, stays 71 arranged vertically are further extended toward the longitudinal direction, and support shafts 72 project downward from the respective stays 71 to support each support. A roller 73 that abuts on both end faces in the width direction of the upper and lower flange portions having an H-shaped cross section through a bearing (not shown) on the shaft 72.
Is rotatably attached. Therefore, when the hydraulic motor 65 is rotated, the slider 62 moves the rollers 70,
While the flange portions 62a and 62b are being guided by 73, the sprocket 66 of the hydraulic motor 65 simultaneously winds and pays out the chain 63, and the slider 62 is moved so as to hand the chain 63.

The head rotating device 80 has a box-shaped frame 81 attached to the lower surface of the left end of the slider 62 of the head slide device 60, and a hydraulic motor 82 and a bearing 83 are provided in the frame 81. The respective axes are aligned vertically with the moving direction of the slider 62 and are arranged vertically. A pinion 84 is attached to the rotary shaft of the hydraulic motor 82 that projects further leftward from the frame 81. On the other hand, a support base 85 that supports the nozzle head 91
A gear 86 is attached to the gear shaft 86, and a support shaft 87 is provided so as to coincide with the center of the gear 86.
Is rotatably supported by a bearing 83 in the frame 81, and a gear 86 serves as a pinion 8 for the hydraulic motor 82.
It meshes with 4. Therefore, when the hydraulic motor 82 is rotated, the nozzle head 91 is rotated around the support shaft 87 and the gear 86, that is, in the plane orthogonal to the moving direction of the slide device 60 in the clockwise and counterclockwise directions to support it. It is possible to adjust the swinging angle of the existing nozzle head 91.

Further, as clearly shown in FIGS. 3 and 5, the nozzle head 91 has a cylindrical portion 92 whose upper end is closed.
It is housed in a cylindrical casing 92 composed of a and a tapered portion 92b having a conical shape extending at the lower end of the cylindrical portion 92a and having an open front end. This is also to ensure the operation of each device or mechanism from dust of the spray material described later.

The spray material injection nozzle 90 used in the nozzle head 91 has a ceramic hose (50A) inserted in a pipe to improve the wear resistance, and the material is formed at the root of the material. The hose 11 and the water hose 12 are connected via a connection mechanism 110, which will be described later. Of the outer diameter of the nozzle 90, a ball portion 93 having a predetermined radius is provided at two locations apart from the root portion. 94 is formed. Then, as further shown in FIG. 6, the root portion of the nozzle 90 is inserted from the opening portion of the tapered portion 92b of the casing 92, and the protruding tip portion of the nozzle 90 out of the sphere portions 93, 94. The near spherical portion 93 is the tapered portion 9
2b is rotatably or slidably supported in a spherical recess 95a of a partition wall 95 provided in 2b.
The existing dust seal 96 is disposed at a position closer to the protruding end of the nozzle 90, and the existing oil seal 97 is disposed at a position closer to the root of the nozzle.

On the other hand, of the balls 93, 94, the ball 94 closer to the root of the nozzle is rotatable or slidable in a spherical recess 98a formed at a position eccentric from the central axis of the gear 98. This gear 98 is supported by the housing 92.
Two opposing brackets 99 arranged at a predetermined angle in the cylindrical portion 92a and protruding in the cylindrical portion 92a.
The three pinions 100a to 100c are rotatably supported via bearings or the like between a and 99b, and one of the pinions 100a is attached to the rotary shaft of the hydraulic motor 101. Also, each of the brackets 99
From the outer end surfaces of a and 99b, the bearing shafts 102a and 102b are provided, and the support shafts 103a and
103b is rotatably projected, and each support shaft 103a, 1
Rollers 104a and 104b that are in contact with both end surfaces of the gear 98 are attached to the wheel 03b. The center axis of rotation of the gear 98 and the support axis of the ball portion 93 near the tip of the nozzle are aligned with the axis of the casing 92.

Therefore, when the hydraulic motor 101 is rotated, the gear 98 is rotated along with the rotation of the pinion 100a, but this rotation center axis and the support shaft of the ball portion 94 near the nozzle root portion are eccentric. Moreover, since the rotation center axis of the gear 98 and the support axis of the ball portion 93 near the nozzle tip portion are aligned, the ball portion 93 near the nozzle tip portion.
The center of the nozzle is used to swing the tip of the nozzle into a conical shape as shown by the solid line and the chain double-dashed line in FIG. At this time, the rotational diameter of the nozzle tip portion that is circularly moved by swinging is the distance between the two spheres 93, 94, the distance from the sphere portion 93 near the nozzle tip portion to the nozzle tip portion, and the nozzle root portion closer. Since it is determined by the amount of eccentricity of the support shaft of the sphere portion 94 with respect to the rotation center axis of the gear 98, these specifications may be set according to the diameter of the spraying circular motion of the spraying material described later. Further, when the radius of gyration of the nozzle tip is made variable, the eccentric amount of the support shaft of the ball portion 94 near the nozzle root portion with respect to the rotation center axis of the gear 98 is changed and set among the parameters that are the determining factors. Since it is difficult to do so, for example, the support position of the ball portion 93 near the nozzle tip portion may be moved back and forth, that is, in the longitudinal direction of the housing 92 so that the remaining two specifications are relatively changed and set. .

Further, as described above, the material hose 11 and the water hose 12 are connected to the root of the nozzle 90 via the connecting mechanism 110 as shown in FIG. This connection mechanism 110 itself is an improvement over the existing one for mixing two substances in the nozzle 90, and the hose 11 for the blowing material that has been pumped with the pressurized air is a water hose with a normal fastening member. The hose 11 is attached to the connection attachment 111, and the attachment 111 is connected to the root of the nozzle 90 by a normal connecting member.
The inner side of is directly communicated with the inner hole of the nozzle 90. On the other hand, the water hose connection attachment 111 is connected to the protrusion 112 that connects the tip of the water hose 12, and a storage that communicates with the protrusion 112 and stops water outside the inner hole of the nozzle 90 and circulates in an annular shape. And a water section 113. Then, a kneading member 11 described later is provided between the water storage portion 113 and the nozzle inner hole.
4 to connect the attachment 111 to the connecting member 11
5 to connect to the nozzle 90. This kneading member 114
To the attachment 11 via the connecting member 115.
When connecting 1 to the nozzle 90, several communication holes 11 that communicate between the water storage section 113 and the inner hole of the nozzle 90
6 is formed, and the water sprayed into the inner hole of the nozzle 90 through the communication hole 116 and the spray material pressure-fed from the material hose 11 are kneaded and sprayed from the tip of the nozzle.

Therefore, in this embodiment, as shown in FIG. 7, four communication holes 116a to 116d are formed on the same circumference of the surface of the kneading member facing the water storage section 113. The set angles θ _{1 to} θ _{4 of} these communication holes 116a to 116d with respect to the central axis of each nozzle are different. More specifically, in FIG. 7, the setting angle θ ₁ of the lower communication hole 116a is set.
Is the largest, and then the communication holes 116b, 1 clockwise.
The set angles θ ₂ and θ _{3 of} 16c are small, and the set angle θ ₄ of the communication hole 116d on the right side in FIG. 7 is the smallest. Therefore, the lengths L _{1 to} L ₄ at which the communication holes 116a to 116d reach the inner surface of the nozzle inner hole are gradually increased, contrary to the set angles θ _{1 to} θ ₄ . Therefore, each communication hole 116
The spray angle and spray position of the water sprayed from a to 116d will change spirally in a time series, and the spray material pumped from behind will be more efficiently kneaded with water and the nozzle tip. Jetted from the department. In order to obtain the same effect, for example, a baffle plate which forms a spiral shape or a part thereof is arranged in the inner hole of the nozzle 90, and the water or spraying material that abuts on the baffle plate is moved by the spiral motion. You may make it knead | mix efficiently. Further, although difficulties in production are expected, it is possible to achieve more efficient kneading by twisting the communication hole itself in a spiral shape.

Next, the structure of the spray material supplying device 2 will be described with reference to FIG. A detailed description of the carriage 200 itself will be omitted. This spray material supply device 2 is provided with two hoppers 201A and 201B. This is, as will be described later, during tapping which flows through the tapping gutter,
Although hot metal and molten slag are mixed, as is known, due to the difference in specific gravity between the two, they are separated in a relatively short time, and the molten iron flows under the molten slag. Considering the wear and tear that both parties give to the tappipe, it was necessary to change the composition and properties of the spray material used in each of the hot metal and slag basins (the reason for this will be described in detail later). Due to such a reason, two hoppers for individually storing two kinds of spray materials, that is, the spray material for the hot metal basin and the spray material for the molten slag basin, are provided. In addition, above each hopper 201A, 201B,
As described above, the sacking blade 202 for sacking the spray material conveyed in the container bag 10 is provided.

Below the hoppers 201A and 201B, independent screw feeders 203A and 20B are provided.
3B is provided. These screw feeders 2
03A and 203B have the same or substantially the same structure and operation as those of the existing ones, and the screws 204A and 2
When 04B is rotated by the rotational driving force of the motors 205A and 205B, the spray material slipped off from the hoppers 201A and 201B is pushed in the material propelling direction (lead direction) of the screws 204A and 204B.
And the two screw feeders 203A, 203B
In the material propelling direction, a drop opening is opened, and a common spray gun 210 is installed below the drop openings of both screw feeders 203A and 203B. This spray gun 210 mixes a spray material sliding down from its upper opening into a predetermined amount of pressurized air whose pressure is adjusted or flow rate is adjusted by an air valve unit 212 described later to press the spray material. The material is pressure-fed into the material hose 11 by the pressure of air. Therefore, in the spraying material supply device 2, the air valve unit 212, the additive water valve unit 214 for adjusting the pressure or the flow rate of the additive water supplied from the water hose 12 to the nozzle 90, and these are integrated. A control panel 216 for controlling the above is provided.

Next, the configurations of the air valve unit 212 and the added water valve unit 214 will be described with reference to FIG. The pneumatic circuit shown in FIG.
1A, 201B and the spray gun 210 are comprehensively described. The air valve unit 212 receives high-pressure pressurized air from the air compressor 5 as the air source valve 220.
Via a pressure reducing valve 221 driven by an electric motor 221a, an air release valve 222 for supplying and shutting off pressurized air reduced by the pressure reducing valve 221, and a supply through this air release valve 222. A flow meter 225 having stop valves 223 and 224 on the inlet side and the outlet side for measuring the flow rate of the pressurized air, the outlet side of the flow meter 225 and the spray gun 2 respectively.
The air transfer system having a check valve 226 interposed between the inlet side and the inlet side of 10 and a bypass flow passage 228 having a stop valve 227 inserted in the middle of bypassing the flowmeter 225, and an air source valve 220. And the pressurized air between the pressure reducing valve 221 and the filter 2
A pressure reducing valve 231 which is supplied via 30 to reduce the pressure to a lower operation pressure than a predetermined pressurized air for air transportation, and a 3 port which supplies the operation pressure reduced by the pressure reducing valve 231 to the air release valve 222. Between the two-direction electromagnetic directional control valve 232, the electromagnetic on-off valve 234 that similarly supplies and shuts off the operating pressure reduced by the pressure reducing valve 231 to the vibrator 233 of the spray gun 210, and between the outlet side and the vibrator. An operation system including a stop valve 205 that is inserted.

The added water valve unit 214 includes an electromagnetic opening / closing valve 242 to which added water having a predetermined pressure is supplied via a water source valve 240 and a filter 241, and the electromagnetic opening / closing valve 24.
A motor-driven variable throttle valve 24 connected to the outlet side of
3 and stop valves 244 and 2 on the inlet side and the outlet side for measuring the flow rate of the added water connected to the outlet side of the variable throttle valve 243, respectively.
45 having a flow meter 245, a check valve 247 inserted between the outlet side of the flow meter 246 and the water hose 12, and a bypass having a stop valve 248 inserted in the middle of bypassing the flow meter 246. And a flow path 249.

Then, the electromagnetic directional control valve 232 that operates the air release valve 222 of the air valve unit 212 and the electromagnetic on-off valve 234 that operates the vibrator 233, the electromagnetic on-off valve 242 and the variable throttle valve 243 of the additive water valve unit 214 are the carriage. The drive is controlled by a programmable controller 250 provided in a control panel 216 mounted on the 200. This programmable controller 25
As shown in FIG. 10, 0 is a level that is provided on the input side of the receiving circuit 252 that receives and decodes a command signal from the portable control box 251, which will be described later, and on the upper and lower parts of the hopper of the spray gun 210. Switch 253
254, level switches 255A and 255B arranged below the hoppers 201A and 201B are connected, and a transmission circuit 261 for transmitting a lamp lighting command to the portable control box 251 to the output side, and a pressure reducing valve 221 of the air valve unit 212. , Electromagnetic direction switching valve 232, electromagnetic on-off valve 234, electromagnetic on-off valve 242 of added water valve unit 214 and variable throttle valve 243, gun motor 262 for cutting out spray gun 210, each screw feeder 20.
3A and 203B drive motors 205A and 205B are connected.

Here, the portable control box 251
As shown in FIG. 11, the operator selected to spray the hot metal gutter has a size that can be carried around the waist, etc., and the traveling position of the spraying vehicle 1 and the movement of the boom are remotely controlled on the upper surface of the spraying position. Spraying vehicle operation unit 271 for setting
And a spraying operation unit 272 that remotely controls the spraying material supply device 2 to operate spraying construction.

The spraying vehicle operating section 271 is composed of a switch section 273 for selecting a working mode such as traveling, boom operation, and turning operation of the spraying vehicle 1, and two sets of operating directions for the modes selected by the switch section 273. It is composed of joystick levers 274 and 275.
Joystick lever 2 with the mode selected in 3.
By operating 74, 275, traveling of the spray vehicle,
It is possible to remotely control the turning and bending of the boom.

The spraying operation section 272 has an operable lamp 281 for notifying whether or not a spraying operation can be performed.
A nozzle rotation start push button 282 for instructing to start the rotation operation of the spray material injection nozzle 90 by rotationally driving the hydraulic motor 101 of the nozzle head 91, a nozzle rotation stop push button 283 for instructing stop, and the hoppers 201A, 20.
A hopper selection switch 284 for selecting 1B, a spraying start push button 285 for instructing the start of spraying work, a spraying end push button 286 for instructing the end, an emergency stop switch 287, and a swing of the nozzle head 91. Joystick lever 288 for instructing, a joystick lever 289 for instructing the flow rate of the added water, a joystick lever 290 for instructing slide and swivel of the nozzle head 91, and a sliding speed of the nozzle head 91 in two steps of high and low or in multiple steps. A slide speed selection switch 291 for switching to a stage is provided.

The programmable controller 25
0 performs sequence control based on the command signal from the portable controller box 251 according to the time chart shown in FIG. That is, when the receiving circuit 252 receives the start signal from the portable controller box 251 and the selection signal for selecting the hopper 201A, for example, at the time t ₁ , the screw feeder 201 corresponding to the selection signal is received.
The drive motor 205A of A is rotationally driven, whereby the blowing material for the hot metal flow region in the hopper 201A is started to be fed into the hopper 210a of the spray gun 210, and the operable lamp 2 for the portable control box 251 is operated.
A lamp control signal for controlling the blinking of 81 is sent to the transmission circuit 261, the operable lamp 281 of the portable control box 251 is blinked, and the air valve unit 212 is further operated.
The secondary side pressure of the pressure reducing valve 221 is set to a pressure according to the blowing material for the hot metal flow region.

When the upper level switch 253 of the spray gun 210 is turned on at the time point t ₂ , the rotation of the drive motor 205A of the screw feeder 203A is stopped accordingly, and the spray preparation is completed. Accordingly, the operable lamp 281 is controlled to be in a lighting state.
In this state, at time t ₃ , the portable control box 2
When the receiving circuit 252 receives the spray start command from the air conditioner 51, first, the electromagnetic directional control valve 2 of the air valve unit 212 is received.
By switching 32 from the normal position to the offset position, the air release valve 222 is opened, and thereby the pressurized air for air transportation of a predetermined pressure is started to be supplied to the spray gun 210.

[0047] Then, the solenoid valve 242 added water valve unit 214 from the time t ₃ at t ₄ after the predetermined time T1 has elapsed is operated to open, thereby the addition water spray material injection nozzle 90 of the spray vehicle 1 Supply is started. afterwards,
Start the quantitative extraction of hot metal basin for spraying material Ganmota 262 of spray gun 210 from the time t ₄ at t ₅ after a predetermined time T2 has elapsed is stored are rotated in the hopper 210A, spraying vehicle No. 1 spraying material injection nozzle 9
The spray material for hot metal basin is pressure-fed at a predetermined pressure to 0, mixed with added water by this spray material injection nozzle, and sprayed at a predetermined construction position.

By continuing this construction state, the amount of the hot metal basin spray material stored in the hopper 210A of the spray gun 210 decreases, and the spray gun 2 is correspondingly reduced.
When the upper level switch 253 of 10 is turned off at time t ₆ , the drive motor 205A of the screw feeder 203A is driven to rotate again, and the hot metal blasting material is thrown into the hopper 210a of the spray gun 210 from the hopper 201A. When the upper level switch 253 is turned on at time t ₇ , the drive motor 205A of the screw feeder 203A is stopped.

After that, at time t ₈ , when the spraying construction of the hot metal basin is completed and the stop signal from the portable control box 251 is received by the receiving circuit 252, first, the gun motor 262 of the spray gun 210 is stopped. While the pressure feed of the hot metal blasting material to the spraying material injection nozzle 90 is stopped, the operable lamp 281 is returned to the blinking state.

After that, at a time t ₉ after a lapse of a predetermined time T 3 from the time t _8, the electromagnetic opening / closing valve 242 of the addition water valve unit 214 is closed to cut off the supply of the addition water to the spray material injection nozzle 90. by directional control valve 232 of the air valve unit 212 at time t ₁₀ the further predetermined time T4 elapses after the time point t ₉ is switched to the normal position the air release valve 222 is closed, spray gun 210
The supply of the pressurized air for air transportation to the air is shut off, the electromagnetic opening / closing valve 234 is closed and the vibrator 233 is stopped, and further, the operable lamp 281 is extinguished, and the next operation, for example, the slag flow area blowing is performed. The operation for attachment work can be started.

In the spraying work for the molten metal basin, the spraying material for the molten metal basin is introduced into the spray gun 210 from the hopper 201B instead of the hopper 201A in the spraying work for the molten pig iron basin, and the air valve unit is used. 212
The same operation as described above is performed except that the secondary pressure of the pressure reducing valve 221 is changed to a pressure according to the spray material for the molten slag flow region.

When the receiving circuit 252 receives the flow rate command signal of the added water from the portable control box 251, the variable throttle valve 243 of the added water valve unit 214 is operated accordingly. Then, the amount of added water is adjusted to a flow rate according to the flow rate command signal. Also,
Hopper 210a of spray gun 210 at the time of spraying construction
When the spray material bridging phenomenon occurs in the inside or the spray material from the hoppers 201A and 201B is not supplied for some reason and the lower level switch 254 of the spray gun 210 is turned on, an alarm circuit 263 is generated. An alarm signal is output to notify the occurrence of an abnormal situation.

Similarly, the amount of spray material in the hoppers 201A and 201B is reduced and the level switches 255A and 255B are reduced.
Is turned on, an alarm signal is output to the alarm circuit 263 to issue a warning prompting the charging of the spray material to the hoppers 201A and 201B. Next, the operation of the tappipe construction apparatus of this embodiment, an example of use including the construction method, and its operating principle will be described.

First of all, the tap iron gutter used in this embodiment is shown in FIG.
As shown in FIG. 3, although it may be existing or newly installed, as in the conventional case, the portion of the gutter that is the outermost shell is formed of the fire brick 301. Then, the back lining 302 made of a castable layer having a predetermined thickness is formed on the floor (the portion corresponding to the bottom of the gutter) and the wall (the portion corresponding to the side surface of the gutter) by using the conventional casting method. After the back lining 302 is completely cured, the blast furnace gutter construction device described above is optionally used on the back lining 302 to carry out the details of the spraying method to be described later while carrying out the spraying of the spray material. Sprayed on the floor and wall, and each has a predetermined thickness (for example, 200 mm
Above) Working lining 30 consisting of spray material layer
Make up 3.

Further, as shown in FIG. 14, when the tappipe is used for actual tapping and is worn out, when the working lining 303 remains with a predetermined thickness, the tapping construction device is used. Is used as necessary to spray the sprayed material onto the damaged portion, and the working lining 3
03 is restored as it was. FIG. 15 briefly shows the outline of the repair procedure. First, the surface of the worn working lining 303 is cleaned, or the surface of the working lining 303 is prepared by shaping the sprayed material so that the spray material can be easily joined. Next, the sprayed material is sprayed on the surface of the old working lining 303, and if necessary, a heating means such as a burner is used to cure the sprayed material and bond it to the sprayed material of the old working lining. To restore the new working lining 303 as a whole.

Here, the composition of the spray material is briefly described.
For this reason, this type of spray material has a non-uniform particle size.
In addition, particles having various particle sizes are mixed. This is finished
The strength of the spray material layer as a repair layer, that is, the wear rate
While making it smaller, the amount of dust generated and rebound loss
The spraying rate of the spray material called is reduced and the tip of the nozzle
Phenomenon that the kneading spray material drips from the part (hereinafter,
This is to prevent the occurrence of (nozzle drooling)
More specifically, the spray pressure is 3 to 5 kgf / cm²When
25 to 30 components called fine powder having a particle size of 75 μm or less
%, The component called coarse particles with a particle size of 1 mm or more is 25%
Approximately 30%, spray pressure is 5-7kgf / cm ²When
Fine powder 15-20% and coarse particles 15-25%
As the coarse particles, as shown in FIG.
With a sharp and sharp shape, these coarse particles will take precedence.
Struck or was buried in the spray material being sprayed
This helps reduce rebound loss.
It should be noted that such sharp coarse particles are used for the spray material once solidified.
Crushed with a suitable impeller (blade-shaped crusher)
Can be obtained by

Further, in order to shorten the construction time, it is necessary to increase or secure the injection amount of the spraying material from the nozzle. For that purpose, the amount of pressurized air supplied is increased and the hose is increased. It is necessary to reduce the pressure loss of the nozzle. Therefore, in this embodiment, the pipe diameter of the pressurized air and the hose diameter are increased, and the material hose diameter and the nozzle diameter are also increased. Further, it is necessary to finely adjust the added water for kneading the spray material, and if the pressure or flow rate of the added water is not proper, nozzle dripping may occur or rebound loss may increase. Therefore, more specifically, the supply water pressure is about 10% higher than the spraying material supply pressure, and the flow rate is about 12 to 15% of the spraying material supply amount.
It is preferable to set it to a degree. Further, in order to improve the kneadability of the spraying material with the added water, it was found that the length of the nozzle is also involved, but this is changed by improving the kneading efficiency by using the kneading member or the like. In order to
It is necessary to set the nozzle length in consideration of the kneading efficiency in the nozzle.

Next, the construction procedure of the construction body to be actually constructed will be described. In the most outline, as shown in FIG. 17, first, the spraying material is sprayed on the laying portion 310 which is the construction body, then the spraying material is sprayed on the one wall portion 311 and then the other wall. The spray material is sprayed onto the part 312. At this time, it is important to spray the next spray material before all the spray materials have dried or hardened so that the dried or hardened construction body (entire working lining) is integrated. Is. For example, as shown in FIG. 18, when the spraying material is sprayed only on the wall portion 311 where the back lining 302 is exposed, at the time of tapping, the spraying material is sprayed from the thinnest boundary portion. This is because peeling starts, and in order to prevent this as much as possible, it is necessary to integrate the spray material to be sprayed so as not to create a boundary portion.

Further, when a new spraying material is sprayed onto the worn working lining to restore the working lining, the thickness of the old working lining (hereinafter, referred to as the residual thickness) must be taken into consideration. .
As described above, in the tap iron flowing through the tap pipe, the basins are separated so that the hot metal flows below the hot metal and the molten metal flows above it. Of these, as shown in FIG. 19, the region in which the hot metal flows is referred to as a metal line (ML), and the region in which the molten metal flows is referred to as a slag line (SL). FIG. 20 shows the occurrence rate of peeling at tapping when the working lining having the predetermined thickness is restored by spraying another spraying material. As is clear from the figure, when the remaining thickness of the old working lining is less than 50 mm, the floor, the slag line (SL), and the metal line (ML) show a high peeling occurrence rate, but the remaining thickness is 50 to 50 mm. In the range of 100 mm, the peeling occurrence rate is extremely reduced, and when the remaining thickness is thicker than 100 mm, peeling does not occur in all parts. Therefore, in this embodiment, when the remaining thickness of the old working lining is 50 mm or more, preferably 100 mm or more, a new blowing material is sprayed to restore and repair the working lining.

In view of this, the working lining thickness of the spray material layer initially constructed is at least 200 mm or more for reasons such as repair frequency and avoidance of cracks or explosions of the spray material currently used. Is desired. The crack of the sprayed material here means a crack generated in the construction body due to shrinkage that occurs when the sprayed material is dried and solidified. Further, the explosion of the sprayed material means that the volatile components, water, and non-volatile components mixed in the sprayed material are accumulated between the lining component and the back lining during the heating and drying, and when the volatile component, the water, and the non-volatile component expand due to heating, the construction body itself Shows a burst from the back lining that occurs in the. Further, in order to protect the entire hot metal gutter structure (including the refractory brick layer) from such damage of the working lining, the backing thickness made of the casting material is 100 mm or more in this embodiment. The maximum thickness of each of these linings is calculated back from the width and depth of the hot metal gutter that should be originally secured and the width and depth of the groove formed of the refractory brick layer, and in this embodiment, the working lining thickness is 400 mm or less. did.

Further, when the working lining is worn out, particularly when the tapping is stopped and the working material is sprayed and repaired, the residual heat temperature of the old working lining is controlled to 30 to 120 ° C. Further, when the spraying material is sprayed in the above control residual heat temperature range to restore / construct the working lining, the curing time of the spraying material is also an important management item. That is, if the spray material cures quickly, a large amount of water, which escapes during drying, accumulates on the back side of the construction body, that is, the old working lining or back lining side, and the adhesion with them is impaired. It
In addition, when the spray material cures slowly, the shape retention described above is poor, and shrinkage cracks easily occur in the construction body. Therefore,
In the present embodiment, for example, when the hardening of the construction body is defined as that the gold rod having a diameter of 5 mm does not penetrate into the construction body, the curing time of the spray material in the control residual heat temperature range is set to 1 to 3 hours. By doing so, it was set up to solve the above problems.

Next, a more specific spraying method of the spraying material will be described. In this embodiment, since it is premised that the spray material is sprayed so that the floor part of the gutter and the both wall parts can be integrated as described above, the floor part and then the both wall parts are sprayed in this order. In this case, unlike the conventional method, the nozzle tip is first circularly swung while moving the nozzle tip in the flow direction of the tapped metal, that is, the longitudinal direction of the gutter. Spray the sprayed material on the surface so that a predetermined overlapping area with the previously sprayed area will occur,
Here, the spraying work of the spraying material is repeatedly performed over a predetermined range (hereinafter referred to as a block) of the floor portion over 1 to 3 m. Then, as shown in FIG. 21 (b), the nozzle tip portion is circularly swirled with respect to one of the wall portions in the same manner as described above, while flowing in the flow direction of tapping metal (substantially in the opposite direction to the flow direction). Good), that is, by moving in the longitudinal direction of the gutter over the length of the block range and spraying the spraying material on the lowermost stage of the wall part so that a predetermined overlapping range with the previously sprayed part is generated as described above. Then, this is repeated within the block range so as to be sequentially stacked on top, and the spraying material is sprayed on the wall part, and the same procedure is followed to spray within the equivalent block range on the other wall part. The material is sprayed. Then, these series of spraying operations are sequentially performed within the block range of the adjacent gutter to complete the spraying operation on the entire gutter.

Particularly in the spraying of the spraying material on the gutter wall portion, if the nozzle is simply moved horizontally, that is, in the flow direction of tapping metal or in the opposite direction, as in the conventional case, the spraying range of Coarse particles of the spraying material are concentrated in the central portion of the center, and fine powder of the spraying material is concentrated in the periphery thereof, so that the construction body becomes heterogeneous. Therefore, while rotating the nozzle circularly to even out the non-uniformity of the spray material within the spray range, the spray range is gradually moved to expand the spray range. The circular turning radius of the nozzle tip portion in this embodiment of the nozzle head described above is set so that the spraying range diameter of the spraying material is about 300 mm, as shown in FIG. Then, as shown in FIG. 23, the spraying of the lowermost stage is performed so that a predetermined thickness of the working lining is secured by spraying the first stage of the wall portion. Furthermore, returning to FIG. 22, for example, about 100 m with respect to the lower spray material layer.
By providing an overlap of about m, the step difference between the two is eliminated, and the spray material layer at the upper end is sprayed in the same spraying range diameter of about 300 mm, and the spray material layer at the lower stage is repeated by repeating this procedure. The upper layer of spray material is laminated while utilizing the shape retention property of No. 3, and spraying is performed without collapsing the working lining of the wall. According to the head rotating device 80 of the construction device described above, in spraying the wall portion, the spray layer can be sequentially moved to the upper stage only by rotating the nozzle head 91.

Further, FIG. 24 shows the relationship between the spraying range (block length) and the rebound loss in this embodiment. As is clear from the figure, when the spraying range becomes longer than a certain block range length, the rebound loss increases.
Thus, when the spray material is sprayed by superposing the previous spray material layer and the next spray material layer, if the block range, that is, the spray range of the spray material layer becomes too long, Since the time required for spraying becomes long, the outer peripheral portion of the spraying circle layer of the preceding spraying material layer begins to harden, and the rebound occurs when the spraying material of the next spraying material layer is sprayed onto this. It was confirmed that the loss increased. This is all related to the curing time of the spray material layer.
That is, depending on the construction thickness of the spray material, the discharge capacity of the nozzle, the curing time of the spray material itself, including the amount of water added to the spray material, etc., the block range length that does not increase the revan odor should be set. By doing so, the adhesiveness between the preceding layer and the succeeding layer is secured, and the boundary between them does not occur. By the way, for example, the curing time of the spray material is 1
The discharge capacity of the sprayed material by the nozzle is 3t / h in about time.
r, the construction body thickness is 100 to 300 mm, the blowing air pressure is 3 to 7 kgf / cm ² , and when the block width is set to 1 to 3 m in the gutter shape of this embodiment, an increase in rebound loss is suppressed. In addition, the spraying work range could be integrated.

According to the above-described construction device, the moving direction of the slider 62 of the slide device 60 is made to coincide with the moving direction of the nozzle 90, and its moving range is made to coincide with the rotating range of the hydraulic motor 65. The spraying construction within the block range can be easily implemented. Furthermore, it is necessary to set an appropriate range for the spraying distance of the spraying material from the nozzle 90. First, if the spraying distance of the spraying material from the nozzle is short, the spraying pressure is not sufficiently dispersed and the spraying pressure on the spraying surface becomes too high. There is a problem that the material is displaced by the spraying pressure or the spraying layer is peeled off. The lower limit value of the spraying distance of the spraying material from the nozzle where such a problem does not occur was 400 mm.
Further, if the spraying distance of the spraying material from the nozzle is long, the range of scattering of the fine powder that has not been completely kneaded with water yet spreads with the dispersion of the spraying pressure, and the amount of dust generation increases. . FIG. 25 shows the relationship between the spraying distance of the spraying material from the nozzle and the dust generation level. From the figure, the spraying distance upper limit value of this embodiment satisfying the allowable value of the dust generation level. Was 1200 mm.

The operation of the nozzle 90 and the spraying operation of the spraying material are performed by the portable control box 2 described above.
The operator carries 51 and controls the boom 28 after stopping the spraying vehicle 1 at the spraying position by the spraying vehicle operation unit 271, and at the same time, one end of the slider 62 is brought closer to the main body 61 side by the spraying operation unit 272. The nozzle head 91 is set to the spraying start position by moving it to the above position, and the hydraulic motor 50 is rotationally driven to rotate the gear 48 of the chucking device 33 to spray the moving direction of the slider 62. After matching the advancing direction, the nozzle rotation start push button 282 of the spraying operation portion 272 is pressed to rotationally drive the hydraulic motor 101 of the nozzle head 91 to rotate the nozzle 90, and in this state, the spraying start push button 285 is pressed. As a result, the spraying material supply device 2 is sequence-controlled by the programmable controller 250 as described above. It is carried out by.

At this time, in particular, when the wall portion is sprayed for the first time, it is desirable that the spraying is performed in a plurality of layers in order to obtain a predetermined thickness of 200 mm or more.
In this case, first, for the first layer (construction thickness of about 30 mm) at the start of spraying, the discharge pressure from the nozzle 90 is 3.0 to 5.0 kgf according to the physical properties of the spray material.
The pressure is set to a low pressure of / cm ² , and in this state, the nozzle head 91 is first fixed at the spraying start position, the spraying material is sprayed in a circular shape while rotating the nozzle 90 to form a predetermined thickness, and then the slider 62 is formed. As shown in FIG.
As shown in FIG. 1 (b), the spraying of the lowermost stage is performed, then the slider 62 is returned to the starting position, and the nozzle head 91 is rotated by the head rotating device 80 so that a predetermined overlap is sequentially formed on the upper stage side. Hold and spray construction, first
When the spraying of the layer is completed, the discharge pressure from the nozzle 90 is adjusted to 5.0 to 7.0 kg according to the physical properties of the spray material.
The high pressure of f / cm ² is set and the spraying of the second and subsequent layers is performed in the same manner as the first layer.

As described above, the spraying pressure of the first layer is set to 3.
By setting a low pressure of 0 to 5.0 kgf / cm ² , it is possible to reduce the rebound loss by lowering the collision speed of coarse particles against the back lining 302 during spraying on the hardened back lining 302. ,
After that, in the second layer and thereafter, spraying is performed at a high pressure of 5.0 to 7.0 kgf / cm ² to reduce the porosity of the construction body as shown in Table 1 below and to show in Table 2. As described above, it is possible to obtain a dense construction body by reducing the wear rate represented by a relative value with the wear rate being 100 when the discharge pressure is 3.0 kgf / cm ² .

[0069]

[Table 1]

[0070]

[Table 2] Further, during spraying, when a problem such as nozzle clogging occurs in the spraying unit 30 including the nozzle head 91, the boom 28 is swung, and the slide device 60 of the spraying unit 30 is moved to the side of the tappipe. It is mounted on a predetermined mounting table installed, and in this state, as described above, pressurized air is supplied from the piston raising air supply hole 39c of the chucking device 33, as shown in the left half of FIG. By raising the piston 41 and then the boom 28 to raise the cylinder housing 39, the ball 43 is drawn inward from the through hole 40d by the slope portion 36d of the split body 36 in the radial direction of the cylindrical portion 40c. The engaged state of the cylinder housing 39 and the divided body 36 is released. In this state, the boom 28 is moved to insert the cylinder housing 39 into the split body 36 of the new spraying unit 30 placed on the same mounting table, and pressurize air from the piston lowering air supply hole 39b. By supplying, the piston 41 is lowered and the balls 43 are pushed out into the ball storage portion 36c of the divided body 36, whereby the cylinder housing 39 and the divided body 36 are integrated.

As described above, since the entire spraying unit 30 can be replaced by the chucking device 33 with one touch, it is possible to minimize the hindrance to the spraying work. In the above embodiment, the case where the tip of the nozzle 90 is circularly swung by the swivel gear 98 having the spherical recess 98a formed at a position eccentric from the central axis has been described, but the present invention is not limited to this.
It may be configured as shown in FIGS. 26 and 27.

That is, the support base 8 of the head rotating device 80.
The upper end of the support bracket 301 attached to the tip side of the rotary shaft 5 has a T-shaped rotating shaft 30 when viewed from above by the bearing 302.
3, the long shaft portion 303a is rotatably supported, and the tip end of the support arm 305 forming the nozzle head 304 is rotatably attached to the short shaft portion 303b protruding from the bearing 302 of the rotary shaft 303. A support arm 305 is connected to 301 in a universal joint configuration.

The nozzle head 304 includes a support arm 305.
A vertically extending cylinder 306 integrally attached to the lower end of the cylinder, a connection mechanism 308 for connecting the material hose 11 and the water hose 12 to the spray nozzle 307 connected to the upper end of the cylinder 306, and the cylinder A nozzle swirling mechanism 309 that gives a circular motion is provided at the lower end of 306. The nozzle swivel mechanism 309 is provided between the attachment 311 for generating an eccentric rotational force keyed to the rotary shaft 310a of the hydraulic motor 310 fixed to the support base 85, and the attachment 311 and the cylindrical body 306 of the nozzle head 304. And a connecting rod 312 for connecting.

Here, the attachment 311 is a cylindrical support 314 key-connected to the rotary shaft 310a of the hydraulic motor 310, and the lower end surface of the cylindrical support 314 passes through the central axis thereof in the radial direction orthogonal to it. Formed dovetail 3
15, a slide body 317 that is slidably arranged in engagement with the lower end surface and has a support shaft 316 that protrudes downward, and that is provided on one end side of the dovetail groove 315 on the lower end surface of the cylindrical support body 314. Adjusting bolt 318 rotatably and immovably supported by the supporting piece 314 a, one end of which is rotatably and axially immovably engaged with the sliding body 317, and the adjusting bolt 318 is screwed. An engaging ring portion 312a formed at one end of the connecting rod 312 is slidably inserted into the support shaft 316 of the sliding body 317 so as to be slidable, and a retainer for retaining is provided at the lower end side thereof. 320 is fitted. Here, the support shaft 316 is attached to the sliding body 317.
Long holes 317a and 317b are symmetrically provided with the
Fixing bolts 317c, to these long holes 317a, 317b,
The sliding position is fixed by inserting 371d, screwing it into the cylindrical support 314, and tightening.

A T-shaped portion 312b is provided on the other end of the connecting rod 312.
Is formed, and the T-shaped portion 312 b is formed by the nozzle head 304.
Is supported by a pair of brackets 321 formed on the lower surface of the cylindrical body 306 so as to be rotatable and non-slidable in the axial direction. Then, in order to make the spray material discharge end of the spray nozzle 307 rotate circularly, first, the set nut 319 of the attachment 311 of the nozzle rotation mechanism 309 is loosened and the adjustment bolt 318 is rotated to move the slide body 317 into the dovetail groove 315. By sliding along the sliding shaft 317, the eccentricity e of the support shaft 316 protruding from the sliding body 317 and the rotary shaft 310a of the hydraulic motor 310 is changed according to the turning radius of the spraying material discharge end of the spraying nozzle 307. Set.

In this state, the hydraulic motor 310 is rotated to drive the support shaft 316 of the attachment 311.
Performs a circular motion according to the eccentricity e, and this circular motion is transmitted to the cylindrical body 306 of the nozzle head 304 via the connecting rod 312. For this reason, since the nozzle head 304 is supported by the universal joint portion constituted by the T-shaped rotating shaft 303, the nozzle head 304 makes a circular motion with this joint portion as a fulcrum, and the spray nozzle 307 The discharge end part makes a circular motion with a radius according to the nozzle length.

Here, when changing the circular movement radius of the tip of the spray nozzle 307, the eccentric amount of the support shaft 316 may be adjusted by the adjusting bolt 318 of the attachment 311 as described above. Further, the configuration of the slide mechanism 60 is not limited to the above-described configuration, and the guide mechanism is guided by a linear motion guide mechanism using a linear guide device or the like, and the drive mechanism is changed to a chain, and a screw shaft rotated by a hydraulic motor is used. It may be configured with a nut that is screwed into this, and the point is that it is configured so that it can be moved by a distance corresponding to a predetermined section or more.

Further, the chucking device 33 is not limited to the above structure, and an electromagnetic chuck or another chuck mechanism can be applied. Furthermore, in the above embodiment, the case where the spraying vehicle and the spraying material supply device are separate bodies has been described, but the present invention is not limited to this, and the spraying material supply device is mounted on the spraying vehicle. You may make it integrated.

[0079]

As described above, according to the spray material spraying device for forming a tappipe according to the first aspect, the spraying unit is detachably supported by the chucking device on the boom of the self-propelled carriage. Therefore, it is possible to easily and reliably perform the high-pressure spraying of the spraying material, and when an abnormality occurs in the spraying unit, remove the spraying unit by the chucking device and mount a new spraying unit. As a result, it is possible to obtain an effect that the interruption time of the spraying work can be significantly shortened as compared with the case where the abnormality of the spraying unit is repaired in the state of being mounted on the boom.

Further, according to the spray material spraying device for forming the tappipe according to the second aspect, the nozzle head can be slid in the predetermined direction by the slide mechanism, and the nozzle head can be swung by the head rotating device. Therefore, it is possible to automatically perform the spraying construction in the construction section having the predetermined length while the self-propelled carriage is stopped.

Further, according to the spray material spraying device for forming the tap gutter according to the third aspect of the present invention, since the tip of the spray nozzle is circularly swung by the nozzle swivel mechanism, the nozzle head is blown by moving in a predetermined direction. The effect that the attachment material can be sprayed in a spiral shape is obtained. Still further, claim 4
According to the tapping material spraying device for forming a tappipe according to the present invention, the base portion and the split body can be connected by a plurality of balls, and the cam member can be slid vertically in this connection state and its detached state. Thus, it is possible to easily switch the spray units, and it is possible to easily and surely attach and detach the spray unit.

[Brief description of drawings]

FIG. 1 is a schematic overall configuration diagram showing an embodiment of a tappipe construction device that implements the tappipe construction method of the present invention.

FIG. 2 is a detailed view of the spray truck of FIG.

FIG. 3 is a detailed view of the nozzle unit of FIG.

FIG. 4 is a detailed view of the chucking device of FIG.

5 is an overall view of the nozzle head of FIG.

FIG. 6 is a detailed view of the nozzle head of FIG.

7 is a detailed view of a kneading member used in the nozzle of FIG.

FIG. 8 is a detailed view of the spray material supply device of FIG.

9 is an explanatory diagram of a pneumatic / hydraulic circuit of the tappipe construction device of FIG. 1. FIG.

FIG. 10 is a block diagram of a programmable controller that controls the tap iron construction device in FIG. 1.

11 is an explanatory diagram of a portable control box for manually operating the tappipe construction device of FIG. 1. FIG.

FIG. 12 is a timing chart of sequence control of a spray material supply device of the tappipe construction device of FIG. 1.

FIG. 13 is a schematic overall configuration diagram of a taphole gutter completed by the tappipe construction method of the present invention.

FIG. 14 is a schematic overall configuration diagram of a tap iron gutter restored by the tap iron gutter construction method of the present invention.

15 is an explanatory view of the restoration construction of the tap iron gutter of FIG.

FIG. 16 is a detailed explanatory diagram of a coarse particle shape of the spray material in the present embodiment.

FIG. 17 is an explanatory view of the spraying procedure of the spraying material in the restoration construction of the lining.

FIG. 18 is an explanatory diagram of the start of peeling of the sprayed material construction body that has been restored.

FIG. 19 is an explanatory diagram of the remaining thickness of the worn spray material lining.

FIG. 20 is a correlation explanatory view between the residual thickness of the spray material lining and the peeling occurrence rate in the present embodiment.

FIG. 21 is an explanatory diagram of a spraying method of spraying material.

FIG. 22 is a detailed explanatory diagram of a method of spraying a spraying material onto the lining wall portion.

FIG. 23 is a detailed explanatory diagram of the order of spraying the spraying material onto the lining wall portion.

FIG. 24 is a characteristic diagram of the spraying range length and the rebound loss of the spraying material in this example.

FIG. 25 is a characteristic diagram of the dust generation level when the spray distance is changed in the present embodiment.

FIG. 26 is a partial cross-sectional front view showing another embodiment of a nozzle head.

27 is a side view of the attachment of FIG. 26. FIG.

FIG. 28 is a schematic overall configuration diagram of a conventional taphole gutter.

FIG. 29 is an explanatory view of the restoration construction of the conventional taphole.

FIG. 30 is an explanatory diagram of the personnel required for construction of a conventional tappipe.

[Explanation of symbols]

 1 is a spray vehicle 2 is a spray material supply device 30 is a spray unit 33 is a chucking device 60 is a head slide device 80 is a head rotation device 90 is a nozzle 91 is a nozzle head 110 is a connection mechanism 114 is a kneading member 304 is a nozzle head 307 Is a spray nozzle 308 is a connection mechanism 309 is a nozzle swivel mechanism 310 is a hydraulic motor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Yamamoto 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Prefecture (no house number) Inside the Mizushima Works, Kawasaki Steel Co., Ltd. (72) Osamu Kawate, 1-shima Kawasaki-dori, Kurashiki-shi, Okayama Prefecture Chome (No. No.) Kawasaki Steel Co., Ltd. Mizushima Steel Works (72) Inventor Sadayuki Yamazaki 2 1576, Nakasaki, Ako-shi, Hyogo 2 156, Kawasaki Furnace Co., Ltd. (72) Inventor Hiromichi Oka Akaho, Hyogo Prefecture 2 Kawasaki Furnace Co., Ltd., 1576, Higashioki, Ichichu-Chi (72) Inventor Shinichi Maehara 2 Kawasaki Furnace Co., Ltd., 1576, East-Koki, Ako-shi, Hyogo (72) Inventor Kido Yukihisa 29, 3 Higashigura, Kurashiki City, Okayama Prefecture

Claims (4)

[Claims] 1. A sprayed material for forming a tappipe, in which a predetermined spraying material is sprayed at a predetermined discharge pressure on a laying portion and a wall portion which come into contact with molten iron or the like of a taphole gutter of a blast furnace to apply a working lining. The apparatus includes a self-propelled carriage having a boom, and a spray unit detachably held by a chucking device at a boom tip of the self-propelled carriage, and the spray unit sprays at least the spray material. A spraying material spraying device for forming a tappipe, which has a structure for holding a nozzle head so as to be rotatable and slidable. 2. The spraying unit includes a head rotating device that holds a nozzle head so that the nozzle head can rotate, and a slide device that holds the head rotating device so that the head rotating device can slide. The slide device is a chucking device. The spray material spraying device for forming a tap pipe according to claim 1, wherein the spray material spraying device is held by a boom. 3. The nozzle head is provided with a nozzle swivel mechanism for driving a nozzle for ejecting a spray material so that the tip of the nozzle swirls.
The spray material spraying device for forming a tap pipe as described in. 4. The chucking device has a base part attached to the tip of the boom and a disassembled body detachable from the base part, and the base part movably holds a plurality of balls in the radial direction, A cam member for projecting the ball outward in the radial direction is slidably held in the vertical direction, and a ball accommodating portion for accommodating a part of the ball is formed in the divided body. Item 1. A spray material spraying device for forming a tappipe according to item 1 or 2.