JP2858523B2 - Pipe inner surface grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube inner surface grinding apparatus for grinding an inner surface of a cast iron tube before coating, for example, in order to perform anticorrosion powder coating on the inner surface of the tube.

[0002]

2. Description of the Related Art In order to enhance the corrosion resistance of the inner surface of a cast iron tube, powder coating is performed by spraying and welding resin powder to the inner surface of a heated cast iron tube. By the way, a scale such as an oxide film is adhered to the inner surface of the cast iron tube cast by the centrifugal casting method, and powder coating is difficult in this state. Therefore, an operation of grinding the inner surface of the pipe using a grindstone before coating (centering operation) is performed.

[0003] A conventional grinding device for performing a centering operation is to place a cast iron tube on a plurality of rotating rollers, rotate the cast iron tube around an axis, and rotate the cast iron tube at high speed around an axis parallel to the rotation axis. A grindstone was inserted into the cast iron tube and was applied to the inner surface of the cast iron tube to grind the inner surface.

[0004]

However, it is difficult to rotate the cast iron tube itself with a large-diameter, heavy-weight cast iron tube, a cast iron tube having a projection on its outer peripheral surface, or a deformed tube.
He had to work by hand.

An object of the present invention is to provide a pipe inner surface grinding apparatus capable of automatically grinding the inner surface of a pipe which cannot solve the above problems and cannot rotate the pipe itself around its axis. Aim.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a pipe inner surface grinding apparatus according to the present invention is a pipe inner surface grinding apparatus for grinding an inner surface of a pipe arranged on a table, which is installed near a table. A movable table arranged on the bed to be able to move back and forth with respect to the table, a turning member rotatably provided around the axis in the moving direction on the moving table, A work shaft that is protruded in the moving direction of the movable table at a set position and that can be inserted into the pipe, and a grinding tool that is attached to the tip of the working shaft so as to be rotatable around the axis in the moving direction. is there.

[0007]

In the above construction, the movable table is moved to the table side, the working shaft is inserted into the pipe, the outer peripheral surface of the high-speed rotating grinding tool is pressed against the inner surface of the pipe, and the rotating member is slowly rotated. Moves the grinding tool along the inner surface of the tube to grind the entire circumference. After one round, the movable table is further moved to the next work position, and the entire circumference is ground by rotation of the turning member. By repeating this, the entire inner surface of the pipe placed on the table can be ground.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a pipe inner surface grinding apparatus according to the present invention will be described below with reference to FIGS. The pipe inner surface grinding apparatus is capable of grinding not only a large diameter cast iron pipe but also an inner pipe of a different diameter pipe in which rotation of the pipe itself is difficult.

In FIG. 1, reference numeral 1 denotes a rotary table on which a pipe P for performing internal grinding is placed. On a bed 2 installed near the rotary table 1, a feed drive device 10 controls the rotary table 1 with respect to the rotary table. A movable base 3 that can move in and out is installed. The movable base 3 is provided with a revolving face plate (revolving member) 5 that is rotatable about a revolving shaft 4 in the retracting direction. Further, a saddle 7 whose position can be adjusted in the rotational radius direction via a pipe diameter adjusting device 6 is disposed on the turning face plate 5, and the saddle 7 has a working shaft protruding in the moving direction of the movable base 3 and capable of being inserted into the pipe. 8 are provided. A grinding wheel (grinding tool) 9 that is driven to rotate around the axis in the retreating direction is provided at the tip of the working shaft 8.

On a rotary table 1 rotatable about a vertical axis 11 (FIG. 3), a pipe P is arranged via a mounting jig 12 so that its axis O _P is along a horizontal plane. A movable table 3 is arranged on the bed 2 via a guide member (not shown) such as a guide rail so as to be movable in directions of arrows A and B approaching and separating from the rotary table 1. The feed drive device 10 for the movable base 3 has a feed screw shaft 13 disposed on the bed 2 along the moving direction of the movable base 3 so as to be rotatable, and one end of the feed screw shaft 13 is connected to the feed motor 14. Are linked. Then, the female screw member 15 provided at the bottom of the movable base 3 is screwed to the feed screw shaft 13, and the movable base 3 can be moved back and forth by the feed motor 14 via the feed screw shaft 13.

A swivel shaft 4 is rotatably supported on the movable base 3 via a main bearing 16, and a timing gear 1 is provided on a base end side.
7 is attached. A turning motor 18 for turning the working shaft 8 via the turning shaft 4 is provided on the movable base 3,
Timing gear 1 provided on output shaft of turning motor 18
The timing gear 9 and the timing gear 17 of the turning shaft 4 are linked to each other via a timing belt 20. In addition, a slip ring 21 for supplying drive power to equipment and a rotary valve 22 for supplying compressed air are provided at a base end of the turning shaft.

In the tube diameter adjusting device 6, an adjusting screw shaft 31 is rotatably supported in the diameter direction on the front surface of the rotating face plate 5, and a diameter adjusting motor 32 is connected to one end of the adjusting screw shaft 31. One of the screw portions 31a and 31b formed on the adjustment screw shaft 31 in the opposite directions to each other.
A saddle 7 is attached to 1a via a female screw member 33, and a balance weight 35 is provided to the other screw portion 31b via a female screw member 34.

As shown in FIG. 2, a bearing 37 is rotatably supported on the saddle 7 via a pair of tangential trunnion shafts 36. The piston rod of the cylinder 38 for grinding and pressing provided on the saddle 7 via the mounting member 37 is connected to a bracket 39 provided on the base end side of the bearing body 37. Therefore, by contracting the grinding press cylinder 38, the bearing 37 is rotated in the direction of arrow C about the trunnion shaft 36, and the working shaft 8 provided on the bearing 37 is moved outward in the rotational radial direction. And the grinding wheel 9 is pressed against the inner surface of the pipe P to obtain a grinding pressure.

On the bearing body 37, a support shaft 41 parallel to the turning shaft 4 is rotatably supported via a bearing.
The working shaft 8 is attached to the front end of the work 1 via a connecting member 42. The working shaft 8 is formed in a tapered portion 8a having a hollow shape and a tapered front half portion.
The rotary drive shaft 44 is rotatably arranged via the third shaft 3. A cylindrical grinding wheel 9 is fixed to the distal end of the rotary drive shaft 44, and a passive timing gear 45 is attached to the proximal end. A grinding motor 46 is disposed on the connection member 42, and a drive timing gear 47 and a passive timing gear 45 attached to an output shaft of the grinding motor 46 are interlocked and connected via a timing belt 48. Rotation drive shaft 4 by grinding motor 46
The grinding wheel 9 can be driven to rotate at high speed around the grinding axis O ₂ via the shaft 4.

Between the bracket 42a of the connecting member 42 and the reaction force support 49 provided on the movable base 3, two bendable torque support links 50 are provided in the radial direction and the tangential direction of the turning shaft 4, respectively. The torque support link 50 is rotatably connected and holds a power cable 51 for supplying a power source to the grinding motor 46. Then, the torque support link 50 is rotated between the solid line and the imaginary line according to the turning movement of the saddle 7, and
2 and the grinding motor 46 are held in an upward posture, and the grinding reaction force transmitted from the grinding wheel 9 to the grinding motor 46 via the rotary drive shaft 44 and the timing belt 48 is supported.

Next, for example, the inner surface grinding operation of the different diameter pipe P 'will be described with reference to FIGS. The different-diameter pipe P ′ is composed of a receiving port 61 to a receiving-portion-side linear portion 62, a curved portion 63, an insertion-portion-side linear portion 64, and a port 65.

(1) First, the different diameter pipe P 'is connected to the pipe axis O _P
Are located in a horizontal plane, and the vertical axis 11 of the turntable 1 is
So it becomes the axis O _P near the curved portion 63 and fixed via a jig. Receptacle 61 is stopped towards the grinding apparatus to substantially match the axial center O _P and the axis of the pivot shaft 4 of the receiving-side straight portion 62. The diameter adjusting motor 32 of the pipe diameter adjusting device 6
Is driven to rotate the adjustment screw shaft 31 to adjust the position of the saddle 7 to change the turning radius of the outer peripheral surface of the grinding wheel 9 to the different diameter pipe P ′.
To the grinding inner diameter of

(2) With the grinding press cylinder 38 contracted and the grinding wheel 9 rocked in the direction of arrow D, the feed drive device 10 is started to move the movable table 3 in the direction of arrow A, The grinding wheel 9 at the tip of the working shaft 8 is inserted from the receiving port 61 to the inlet side of the receiving-portion-side linear portion 62. The grinding motor 46 is started to rotate the grinding wheel 9 at a high speed, and the grinding press cylinder 38 is advanced to swing the working shaft 8 in the direction of arrow C about the trunnion shaft 36 so that the outer peripheral surface of the grinding wheel 9 is removed. The grinding is started by pressing the inner surface of the receiving-side linear portion 62 with a constant pressure.

(3) The turning motor 18 is driven to rotate the turning shaft 4 slowly, and the working shaft 8 is turned through the turning face plate 5 to move the grinding wheel 9 onto the inner surface of the receiving-portion-side linear portion 62. And move it along the entire circumference. Next, the movable table 3 is moved to the next grinding inner surface by the feed driving device 10 in accordance with the width of the grinding wheel 9, and the turning motor 18 is driven to grind the entire circumference. This is repeated to finish the inner surface grinding of the receiving-side straight portion 62 (FIG. 3). During the feeding movement of the grinding wheel 9, the grinding pressing cylinder 38 is appropriately operated so that an unreasonable load is not applied to the grinding wheel 9.

(4) When approaching the curved portion 63, the rotary table 1 is rotated in the direction of arrow E in accordance with the feed amount in addition to the above-mentioned feed movement. As a result, the axis O of the turning shaft 4 is
₁ and along a substantially tangential direction of Kanjikukokoro O _P, it can be pivoted moving the grinding wheel 9 smoothly along the inner surface of the curved portion 63. In this state, the first half 63a up to the center of the curved portion 63 is ground. (FIG. 4) (5) Once the movable table 3 is retracted by the feed drive device 10, the grinding wheel 9 is pulled out from the different diameter tube P ', and the rotary table 1 is rotated by about 180 degrees so that the insertion opening 64 is placed on the grinding device side. a is opposed, substantially match the axis O ₁ of the pivot shaft 4 to the tube axis O _P of the inserting side straight portion 64.

(6) The insertion-port-side linear portion 64 is ground by repeating (2) to (4), and the latter half of the curved portion 63 while rotating the rotary table 1 in the direction of arrow F in accordance with the feed amount. Grind 63a.

The swing around the grinding work, particularly the axis of the pivot shaft 4 at the curved portion 63 may deviate slightly relative to the tangent of the tube axis O _P, work axis 8 trunnion shaft 36 This can be absorbed. Further, the grinding reaction force of the grinding wheel 9 is supported by the rotation regulating link 50 connected between the grinding wheel 9 and the reaction force support 49, and the rotation regulating link 50 may be broken by an excessive grinding reaction force. Even if there is
The support shaft 41, which is rotatably mounted on the bearing body 37 via a bearing, rotates so that the pipe diameter adjusting device 6, the turning face plate 5, and the turning shaft 4 are not affected, and damage is minimized. be able to.

According to the above embodiment, the movable table 3 is moved to the rotary table 1 side by the feed driving device 10, the working shaft 8 is inserted into the pipes P and P ', and the work shaft 8 is rotated at a high speed by the grinding press cylinder 38. The outer peripheral surface of the grinding wheel 9 is pressed against the inner surface of the pipe P for grinding, and the turning face plate 5 is slowly rotated to move the grinding wheel 9 along the inner surface of the pipe P to grind the entire circumference. After making one round, the movable table 3 is further moved to the next work position, and the entire circumference is ground by rotating the revolving face plate 5. By repeating this, even if the pipe cannot be rotated around the axis, the pipe is rotated. The entire inner surface of the tube P placed on the table 1 can be ground. In addition, by rotating the rotary table 1 in accordance with the feed movement of the grinding wheel 9, the inner surface of the curved tube portion 63 can also be ground, and the different diameter tube P 'can be ground.

FIG. 6 shows another embodiment. This example is
The revolving face plate 5 is provided with a pair of saddles 7, a working shaft 8, and a grinding wheel 9, and the same members as those in the previous embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0025] pair of bearing members 37 disposed in symmetrical positions with respect to the axis O ₁ of the pivot shaft 4, the support shaft 72 with a built-in grinding motor 71 via a bearing is rotatably supported, respectively I have. The output shaft of the grinding motor 71 is connected to the base end of the rotary drive shaft 44 via a coupling 73. In addition, a torque support link 76 whose middle portion is bendable is connected between a bracket 74 attached to the base end of the working arm 8 and a reaction force support member 75 provided at the center of the rotating face plate 5. In addition, the cutting reaction forces of the grinding wheels 9 generated in the relative directions to each other are mutually absorbed, and the load applied to the guide surfaces of the rotating face plate 5 and the saddle 7 is reduced. The main power cable is connected to the grinding motor 71 via the slip ring 21.

Further, the saddle 7 is provided with a displacement detector 77 for detecting the amount of rotation of the bearing body 37. After the grinding wheel 8 is inserted into the pipe P, the displacement detector 77 presses the grinding pressure cylinder 38 during grinding, and the bearing body 37 is pressed.
, The amount of wear of the grinding wheel 9 is detected, and the diameter adjusting motor 32 is driven based on the detected value so that the working shaft 8 is parallel to the axis O ₁ of the turning shaft 4. Saddle 7
By controlling the constant value to adjust the position of the grinding wheel 9
Can be made to abut against the inner surface of the pipe P over the entire width, and can be uniformly worn to improve the grinding efficiency.

According to the above embodiment, the inner surface of the different diameter pipe P 'can be ground in the same manner as in the previous embodiment, and the grinding can be simultaneously performed by the two grinding wheels 9, so that the grinding time can be reduced to half. Moreover, the torque reaction link 76 reduces and reduces the grinding reaction force generated by the two grinding wheels 9 by canceling each other.
The load can be reduced and the structure can be simplified.

Further, by the constant value control of the saddle 7 based on the detection value of the displacement detector 77, the grinding by the full width of the grinding wheel 9 and the uniform wear can be realized, and the grinding efficiency can be improved.

FIG. 7 shows a motor support member 7 attached to the base end of the working shaft 8 by connecting a drive source from a main power cable to a grinding motor 71 via a slip ring 21.
8 are provided integrally, and the motor support member 7
The grinding reaction force applied to the shaft 8 is stopped and supported by the saddle 7 via the trunnion shaft 36. For example, when this is adopted in the embodiment of FIG. 6, the load (moment) about the four axis O _{1 of the} turning shaft applied to both saddles 7 respectively.
Are offset each other because the excavation reaction force of both grinding wheels 9 is in the relative direction. Thus, the reaction force support member 75 and the torque support link 76 can be omitted, and the overall structure can be simplified.

[0030]

As described above, according to the present invention, a movable table which can move back and forth with respect to a table is provided with a turning member which is rotatable around an axis extending in the moving direction. Since the grinding tool was provided via the working shaft projecting in the table's egress and retraction directions, the movable table was moved to insert the working shaft into the pipe, and the outer peripheral surface of the rotating grinding tool was pressed against the inner surface of the pipe for grinding. Further, by rotating the turning member, the grinding tool can be moved along the inner surface of the tube to grind the entire circumference. Therefore, even if the pipe cannot rotate around the axis, the inner surface of the pipe can be ground over the entire circumference.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view showing one embodiment of a pipe inner surface grinding apparatus according to the present invention.

FIG. 2 is a cross-sectional view showing a saddle portion of the pipe inner surface grinding device.

FIG. 3 is a schematic plan view illustrating a grinding operation by the pipe inner surface grinding device.

FIG. 4 is a schematic plan view illustrating a grinding operation by the pipe inner surface grinding device.

FIG. 5 is a schematic plan view illustrating a grinding operation by the pipe inner surface grinding device.

FIG. 6 is a partial side sectional view showing another embodiment of the pipe inner surface grinding apparatus according to the present invention.

FIG. 7 is a side sectional view showing another embodiment of the saddle portion.

[Explanation of symbols]

 P pipe P 'Different diameter pipe O Pipe axis 1 Rotary table 2 Bed 3 Movable table 4 Revolving axis 5 Revolving face plate (Revolving member) 6 Pipe diameter adjusting device 7 Saddle 8 Work axis 9 Grinding wheel (grinding tool) 10 Feed drive 13 Feed screw shaft 14 Feed motor 18 Rotation motor 31 Adjustment screw shaft 32 Diameter adjustment motor 36 Trunnion shaft 37 Bearing body 38 Grinding pressing cylinder 44 Rotary drive shaft 46 Grinding motor 49 Reaction force support 50 Torque support link

Claims (1)

(57) [Claims] 1. A tube inner surface grinding device for grinding an inner surface of a tube disposed on a table, comprising: a movable table which is disposed on a bed installed near the table so as to be able to move back and forth with respect to the table; A pivoting member provided on the movable table so as to be rotatable around the axis in the retracting direction, and a working shaft protruding in the retracting direction of the movable table at a position away from the rotational axis of the pivoting member and capable of being inserted into the pipe, A pipe inner surface grinding apparatus comprising: a grinding tool rotatably mounted on a tip end of the working shaft so as to be rotatable around an axis in a retracting direction.