CN103726801A - Deslagging device and rotary drilling rig - Google Patents

Abstract

The invention discloses a slag discharge device and a rotary drilling machine. The slag discharge device includes an inner pipe, a first outer pipe, an upper slag discharge pipe, a lower slag discharge pipe and a slag suction pump, wherein the first outer pipe is sleeved outside the inner pipe, and the inner pipe is driven by the drill pipe of the rotary drilling rig Rotation; the first outer pipe is provided with an outer slag discharge hole for the upper slag discharge pipe; one end of the upper slag discharge pipe extends into the first outer pipe through the outer slag discharge hole, and the other end is connected with the slag suction pump; the inner pipe There is an upper slag discharge hole opposite to the outer slag discharge hole, and a lower slag discharge hole for the lower slag discharge pipe to pass through. One end of the lower slag discharge pipe extends into the inner pipe through the lower slag discharge hole; the lower slag discharge pipe The other end is used to connect with the drilling tool of the rotary drilling rig. The slag discharge can not only reduce the probability of secondary crushing of the drilling slag, but also prevent the drilling slag from sticking, thereby improving the crushing rate of the primary rock layer or soil layer, and protecting the drill bit teeth; During the construction process, the number of drilling slags is lifted to improve the drilling efficiency.

Description

Slagging devices and rotary drilling rigs

technical field

The invention relates to the field of engineering machinery, in particular to a slag discharge device and a rotary drilling rig.

Background technique

Rotary drilling rig is a construction machine for taking soil and forming holes for cast-in-place piles. It has the advantages of stable power transmission and high efficiency. It is widely used in various foundation constructions such as cast-in-place piles, continuous walls, and foundation reinforcement. The rotary drilling rig is mainly composed of a chassis and a working device. The chassis includes a traveling mechanism, an underframe and a car slewing system. Working devices usually include luffing mechanism, mast assembly, main winch, auxiliary winch, power head, drill pipe and drilling tools, etc.

The process of drilling a hole with a rotary drilling rig is roughly as follows: the drilling tool (such as a rotary bucket) reaches the pile position through the traveling mechanism of the drilling rig and the mast luffing mechanism, and the drill pipe is lowered under the guidance of the mast. This process will be set at the bottom of the drill pipe. The drilling tool is placed in the hole position, the torque is provided for the drill rod through the power head, and the pressure is transmitted to the drill rod and the drilling tool by the pressurizing device through the pressurizing power head, so that the drilling tool breaks the rock and soil and is directly installed into the drilling tool, and then the rotary bucket is lifted out of the hole by the lifting device and the telescopic drill pipe to unload the soil. This cycle is repeated, and the soil is continuously fetched and unloaded until the drill reaches the design depth.

The defect of existing rotary drilling rigs is that during the drilling process, the primary rock layer or soil layer is broken into drilling slag by the drill bit, and some brick slag will inevitably stay near the drill bit. The secondary crushing of drilling slag affects the drilling efficiency of the original rock or soil layer, and accelerates tooth wear; Soil crushing efficiency.

Contents of the invention

In view of this, the present invention proposes a slag discharge device to reduce the secondary crushing of the drilling slag by the rotary drilling rig and avoid sticking of the drilling slag. In order to achieve the above object, technical solution of the present invention is achieved in that way:

The present invention provides a slag discharge device for rotary drilling rigs. The slag discharge device includes: an inner pipe, a first outer pipe, an upper slag discharge pipe, a lower slag discharge pipe and a slag suction pump, wherein the first An outer pipe is sheathed outside the inner pipe, and the inner pipe is driven to rotate by the drill rod of the rotary drilling rig; the first outer pipe is provided with an outer slag discharge pipe for the upper slag discharge pipe to pass through. hole; one end of the upper slag discharge pipe extends into the first outer pipe through the outer slag discharge hole, and the other end is connected with the slag suction pump; the inner pipe is provided with a The upper slag discharge hole provided, and the lower slag discharge hole for the lower slag discharge pipe to pass through, one end of the lower slag discharge pipe extends into the inner pipe through the lower slag discharge hole; the lower slag discharge pipe The other end of the slag pipe is used to be connected with the drilling tool of the rotary drilling rig.

Further, the slag discharge device also includes an upper slewing bearing, the inner ring of the upper slewing bearing is connected with the upper end of the inner pipe, and the outer ring is connected with the upper end of the first outer pipe; the inner ring is connected with the upper end of the first outer pipe. Drill pipe key connection.

Further, the slag discharge device further includes a rotary seal assembly installed between the inner pipe and the first outer pipe, the rotary seal assembly includes an upper rotary seal located above the upper slag discharge hole, and a lower rotary seal located below the upper slag discharge hole.

Further, the number of the upper slag discharge holes is multiple, which are evenly arranged along the circumferential direction of the inner pipe.

Further, the slag discharge device also includes a lower connection mechanism, a lower slewing bearing, a second outer tube and a support wing; wherein, the lower end of the inner tube is connected with the drilling tool through the lower connection mechanism; the lower The connecting mechanism is coaxially linked with the inner tube, and can move along the axial direction of the inner tube; the inner ring of the lower slewing bearing is connected with the lower connecting mechanism, and the outer ring is connected with the second outer tube; The hinged ends of the support wings are respectively hinged to the first outer tube and the second outer tube.

Further, the lower connection mechanism includes a first connection part, the first connection part is keyed to the inner tube, and the keyway and the key bar of the keyed connection are arranged along the axial direction of the inner tube.

Further, the outer wall of the inner tube is provided with a key bar, the first connecting part is sleeved on the periphery of the lower part of the inner tube, and the inner wall of the first connecting part is provided with a key groove matching the key bar .

Further, the lower connection mechanism also includes a connection plate, which is connected to the inner ring of the upper and lower slewing bearings; the connection plate is provided with a through hole for the lower slag discharge pipe to pass through. The other end of the lower slag discharge pipe extends into the drilling tool through the through hole.

Further, the support wing includes: a support plate, an upper hinge rod and a lower hinge rod; the hinged end of the upper hinge rod is hinged to the inner tube, and the other end is connected to the support plate; the hinged end of the lower hinge rod It is hinged with the second outer tube, and the other end is connected with the support plate.

On the other hand, the present invention also provides a rotary drilling rig, which is provided with the slag discharge device described in any one of the above.

The invention provides a slag discharge device. Under the action of the slag discharge pump of the slag discharge device, the upper slag discharge pipe, the gap between the first outer pipe and the inner pipe, the interior of the inner pipe, and the lower slag discharge pipe in the device form a The negative pressure slag discharge channel can suck out the drill slag near the drill tooth in time, which can not only reduce the probability of secondary crushing of the drill slag, but also prevent the drill slag from sticking, thus improving the protection of the original rock layer or soil layer. In addition, since most of the drilling slag can be discharged from the pile hole through the slag discharge device, it can reduce the number of drilling slag lifting during the construction process of the rotary drilling rig and improve the drilling efficiency.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a schematic cross-sectional structure diagram of a slag discharge device provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of a partial three-dimensional structure of a slag discharge device provided by an embodiment of the present invention.

Explanation of reference signs:

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. Below in conjunction with accompanying drawing, each preferred embodiment of the present invention is described further:

Please refer to FIG. 1 , which shows the structure of the slag discharge device provided by the embodiment of the present invention. In order to more clearly show the connection relationship and working principle of the components, the figure also shows a drill pipe 11 and a drill tool 12 . The slag discharge device provided in this embodiment is used for rotary drilling rigs, including: an inner pipe 1, a first outer pipe 2, an upper slag discharge pipe 3, a lower slag discharge pipe 4 and a slag suction pump (not shown in the figure), wherein ,

The first outer tube 2 is sleeved outside the inner tube 1, and the inner tube 1 is driven to rotate by the drill rod 11 of the rotary drilling rig; the first outer tube 2 does not rotate;

The first outer pipe 2 is provided with an outer slag discharge hole for the upper slag discharge pipe 3 to pass through; one end of the upper slag discharge pipe 3 extends into the first outer pipe 2 through the outer slag discharge hole, and the other end is connected to the slag suction pump ;

The inner pipe 1 is provided with an upper slag discharge hole 101 opposite to the outer slag discharge hole, and a lower slag discharge hole for the lower slag discharge pipe 4 to pass through. One end of the lower slag discharge pipe 4 extends into the inner pipe through the lower slag discharge hole 1; the other end of the lower slag discharge pipe 4 is used to connect with the drilling tool 12 of the rotary drilling rig.

The slag discharge device provided in this embodiment is used to suck out the drill slag near the drill teeth of the drilling tool, thereby reducing the probability of secondary crushing and drill slag sticking. For this reason, the slag discharge device provided in this embodiment is provided with a slag suction pump, which communicates with the upper slag discharge pipe 3, and the upper slag discharge pipe 3 passes through the gap between the inner pipe 1 and the first outer pipe 2 in turn, and the inner pipe 1 The pipe 1 and the lower slag discharge pipe 4 communicate with the drilling tool 12. Those skilled in the art can understand that one end of the upper slag discharge pipe 3 should be located inside the first outer pipe 2 and outside the inner pipe 1, that is, it should be located on the first outer pipe 2. between the inner wall of tube 2 and the outer wall of inner tube 1. The inner pipe 1 is coaxially linked with the drill pipe 11 and the drilling tool 12; when the rotary drilling rig is working, the drill pipe 11 transmits the torque to the inner pipe 1, and the inner pipe 1 transmits the torque to the drilling tool 12. The above three components Turn together. During the rotation process, turn on the slag suction pump. The slag suction pump is used as a pump suction device to generate negative pressure near the drilling tool. The drilling slag around the drill teeth passes through the lower slag discharge pipe 4, inner pipe 1, It is discharged from the upper slag discharge hole 101, and then enters the upper slag discharge pipe 3 through the gap between the inner pipe 1 and the first outer pipe 2, and finally is discharged from the pile hole.

The function of the inner pipe 1 in the above-mentioned slag discharge device is to rotate together with the drilling tool 12, suck out the drilling slag near the drilling tool through the lower slag discharge pipe 4, and transport it outward through the inner channel of the pipe. The function of installing the first outer pipe 2 is to prevent the slag discharge pipe from being wound during the slag discharge process. Specifically, the slag suction pump usually does not rotate when it is working, so the corresponding upper slag discharge pipe 3 is also required. The position is relatively fixed, that is, the first outer pipe 2 is required not to rotate; by setting the upper slag discharge hole 101 opposite to the upper slag discharge pipe 3 on the inner pipe 1, the lower slag discharge pipe 4 can rotate with the drilling tool 12 to absorb slag, the upper slag discharge pipe 3 can not move the slag discharge to prevent the slag discharge pipe from winding.

Further, in order to prevent the drilling slag discharged from the upper slag discharge hole 101 of the inner pipe 1 from leaking through the gap between the inner pipe 1 and the first outer pipe 2, the slag discharge device provided in this embodiment also includes a and the rotary seal assembly between the first outer pipe 2 , the rotary seal assembly includes an upper rotary seal 51 located above the upper slag discharge hole 101 , and a lower rotary seal 52 located below the upper slag discharge hole 101 . In this way, the relative rotation between the inner pipe 1 and the first outer pipe 2 can be ensured, and the leakage of drilling slag can be effectively prevented. In order to prevent drilling slag from leaking through the slag discharge hole (outer slag discharge hole and lower slag discharge hole), a first sealing gasket can also be arranged between the upper slag discharge pipe 3 and the upper slag discharge hole 101; A second sealing gasket is arranged between the slag discharge holes. In addition, in order to improve the slag absorption rate per unit time, the number of the upper slag discharge holes 101 of the inner pipe 1 is preferably multiple, and are evenly arranged along the circumferential direction of the inner pipe 1 .

As for the fixing method of the inner pipe 1 and the first outer pipe 2, this embodiment can be realized by adopting an upper slewing support. Specifically, the slag discharge device also includes an upper slewing support 71, the inner ring of the upper slewing support 71 is connected with the upper end of the inner pipe 1, and the outer ring is connected with the upper end of the first outer pipe 2; the inner ring of the upper slewing support 71 is The ring is keyed to the drill rod 11, so that the torque of the drill rod 11 can be transmitted to the inner pipe 1 through the inner ring of the upper slewing bearing 71. More specifically, a key bar may be provided at the connection side of the bottom of the drill rod 11 , and the inner ring of the upper slewing support 71 may be provided with a key groove matching the key bar, or provided with a corresponding key sleeve.

In addition, in order to prevent the pile hole from collapsing during the drilling process, the slag discharge device provided by this embodiment preferably also includes a lower connection mechanism 6, a lower slewing bearing 72, a second outer tube 8 and a support wing 9; wherein,

The lower end of the inner tube 1 is connected to the drilling tool 12 through the lower connecting mechanism 6; the lower connecting mechanism 6 is coaxially linked with the inner tube 1 and can move along the axial direction of the inner tube 1;

The inner ring of the lower slewing bearing 72 is connected with the lower connecting mechanism 6, and the outer ring is connected with the second outer tube 8;

The hinged ends of the support wings 9 are hinged to the first outer tube 2 and the second outer tube 8 respectively.

The effect that support wing 9 is set is: after it is opened, it is supported on the pile hole inner wall, effectively preventing pile hole from collapsing; it can be retracted after the drilling operation is finished, to guarantee the smooth progress of lifting the drill. The hinged ends of the supporting wings are respectively hinged to the first outer tube 2 and the second outer tube 8, when the relative distance between the first outer tube 2 and the second outer tube 8 decreases, the supporting wings 9 are opened, and its supporting plate and pile The holes are pressed against each other; when the relative increase of the first outer tube 2 and the second outer tube 8 decreases, the support wing 9 retracts, and its support plate is separated from the pile hole.

The supporting wing 9 may specifically include (see FIG. 2 ): a supporting plate 91 , an upper hinged rod 92 and a lower hinged rod 93 ; the hinged end of the upper hinged rod 92 is hinged to the inner tube 1 , and the other end is connected to the supporting plate 91 ; The hinged end of the lower hinged rod 93 is hinged with the second outer tube 8 , and the other end is also connected with the support plate 91 ; the upper hinged rod 92 and the lower hinged rod 93 are preferably hinged with the support plate 91 . The number of above-mentioned upper hinged rods 92 and lower hinged rods 93 can be one or more. In addition, the number of the above-mentioned supporting wings 9 may also be one or more, preferably, the number of the supporting wings 9 is not less than three.

The opening and retracting of the support wings 9 is realized by changing the relative positions of the first outer tube 2 and the second outer tube 8, and the change of the relative positions between the first outer tube 2 and the second outer tube 8 is achieved by the inner tube 1 The relative movement with the lower connecting mechanism 6 is realized, specifically: when drilling, the drill pipe 11 together with the inner pipe 1 moves downward under the action of the pressurizing device of the rotary drilling rig until it is connected with the lower connecting mechanism 6 Pressing contact, now the first outer tube 2 also moves downward, the relative distance between the first outer tube 2 and the second outer tube 8 decreases, driving the upper support rods 92 and lower support rods 93 of the support wings 9 The included angle with the vertical surface becomes larger, and the support plate 91 of the support wing 9 is propped up on the inner wall of the pile hole correspondingly; The distance between the inner pipe 1 and the lower connecting mechanism 6 becomes larger, and now the relative distance between the first outer pipe 2 and the second outer pipe 8 also becomes larger, and the upper support rod and 92 and the lower support rod 93 and the vertical The included angle of the surface becomes smaller, and the support plate 91 of the support wing 9 is retracted correspondingly.

The function of the lower connection mechanism 6 is to realize the relative movement of the first outer tube 2 and the second outer tube 8 through the relative movement with the inner tube 1, and then realize the opening and closing of the support wings 9; Torque is transmitted to the drilling tool 12. The effect of setting the lower slewing support 72 is: while ensuring the above-mentioned functions, the second outer tube 8 can not rotate with the lower connection mechanism 6 .

Specifically, in order to ensure the torque transmission function, the lower connecting mechanism 6 can be keyed to the inner tube 1, specifically: the lower connecting mechanism 6 can include a first connecting portion 61, and the first connecting portion 61 can be keyed to the inner tube 1 At the same time, in order to ensure the relative movement of the inner tube 1 and the lower connecting mechanism 6 along the axial direction, the key grooves and key strips of the key connection are arranged along the axial direction of the inner tube 1 . More specifically, the specific way of key connection can be any one of the following ways:

The outer wall of the inner tube 1 is provided with a key bar, the first connecting part 61 is sheathed on the periphery of the lower part of the inner tube 1 , and the inner wall of the first connecting part 61 is provided with a key groove matching the key bar.

The outer wall of the inner tube 1 is provided with a keyway, the first connecting part 61 is sheathed on the periphery of the lower part of the inner tube 1 , and the inner wall of the first connecting part 61 is provided with a key bar matching the keyway.

In addition, in order not to affect the connection between the lower slag discharge pipe 4 and the drilling tool 12, the lower connection mechanism 6 may also include a connecting plate 62, which is connected to the inner ring of the lower slewing bearing 72; The lower slag discharge pipe 4 is pierced through a through hole through which the other end of the lower slag discharge pipe 4 extends into the drilling tool 12 . The lower connecting mechanism 6 may also include a second connecting portion 63 for connecting with the drilling tool 12 , specifically, it may be connected with the drilling tool 12 with a square key or a bolt.

The working process of the slagging device provided by the present embodiment is as follows:

Before use, connect the upper slewing support 71 with the drill pipe 11, connect the lower connection mechanism 6 with the drilling tool 12, and the installation is completed;

During the drilling process of the rotary drilling rig, the slag suction pump is turned on, and the upper slag discharge pipe 3, the gap between the first outer pipe 2 and the inner pipe 1, the inside of the inner pipe 1, and the lower slag discharge pipe 4 form a negative pressure slag discharge channel, thus The drilling slag near the drill teeth of the drilling tool 12 is discharged from the pile hole along the above-mentioned slag discharge channel under the action of negative pressure. The discharge stroke is shown in the direction of the arrow in FIG. 1 for details. At the same time, under the action of the pressurizing device of the rotary drilling rig, the inner pipe 1 moves downward until it contacts the lower connecting mechanism 6, and at the same time drives the relative distance between the first outer pipe 2 and the second outer pipe 8 to decrease, The support wings 9 are opened.

After the drilling of the rotary drilling rig is completed, the slag suction pump is turned off, and during the drilling process, under the gravity of the lower connecting mechanism 6 and the drilling tool 12, the inner pipe 1 moves upward relative to the lower connecting mechanism 6, and at the same time drives the first outer pipe 2 The relative distance to the second outer tube 8 increases, and the support wings 9 retract.

It can be seen from the above that the slag discharge device provided by the embodiment of the present invention has the following advantages:

Under the action of the slag discharge pump, the upper slag discharge pipe 3, the gap between the first outer pipe 2 and the inner pipe 1, the inside of the inner pipe 1, and the lower slag discharge pipe 4 form a negative pressure slag discharge channel, and then the drill teeth can be moved in time. The suction of the nearby drilling slag can not only reduce the probability of secondary crushing of the drilling slag, but also prevent the drilling slag from sticking, thereby improving the crushing rate of the original rock layer or soil layer, and protecting the drill bit teeth;

Since most of the drilling slag can be discharged from the pile hole through the slag discharge device, the number of drilling slag lifting during the construction process of the rotary drilling rig can be reduced, and the drilling efficiency can be improved.

The embodiment of the present invention also provides a rotary drilling rig, the rotary drilling rig is provided with any one of the above slag discharge devices. Specifically, the upper slewing bearing 71 in the slag discharge device is drivingly connected to the drill pipe 11 (such as a key connection), and the bottom of the inner pipe 1 (when the lower connecting mechanism 6 is not provided) or the lower connecting mechanism 6 is connected to the drilling tool 12; The lower slag discharge pipe 4 communicates with the inside of the drill pipe of the drilling tool 12 or communicates with the bottom surface of the drilling tool 12. Those skilled in the art can choose which part of the slag discharge pipe 4 communicates with the drilling tool 12 according to the specific type of the drilling tool.

Since any of the above-mentioned slagging devices has the above-mentioned technical effects, the rotary drilling rig equipped with the slag discharging device should also have corresponding technical effects.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. A slagging device for rotary drilling rigs, characterized in that the slagging device comprises: Inner pipe (1), first outer pipe (2), upper slag discharge pipe (3), lower slag discharge pipe (4) and slag suction pump, wherein, The first outer tube (2) is sheathed outside the inner tube (1), and the inner tube (1) is driven to rotate by the drill rod (11) of the rotary drilling rig; The first outer pipe (2) is provided with an outer slag discharge hole for the upper slag discharge pipe (3); one end of the upper slag discharge pipe (3) extends into the The other end of the first outer pipe (2) is connected to the slag suction pump; The inner pipe (1) is provided with an upper slag discharge hole (101) opposite to the outer slag discharge hole, and a lower slag discharge hole for the lower slag discharge pipe (4). One end of the slag discharge pipe (4) extends into the inner pipe (1) through the lower slag discharge hole; the other end of the lower slag discharge pipe (4) is used to connect with the drilling tool of the rotary drilling rig ( 12) Connected. 2. The slag discharge device according to claim 1, characterized in that it further comprises an upper slewing support (71), the inner ring of the upper slewing support (71) is connected with the upper end of the inner pipe (1), and the outer The ring is connected to the upper end of the first outer pipe (2); the inner ring is keyed to the drill pipe (11). 3. The slagging device according to claim 1, further comprising a rotary seal assembly installed between the inner pipe (1) and the first outer pipe (2), the rotary seal assembly It includes an upper rotary seal (51) located above the upper slag discharge hole (101), and a lower rotary seal (52) located below the upper slag discharge hole (101). 4. The slag discharge device according to claim 1, characterized in that the number of the upper slag discharge holes (101) is multiple, and are uniformly arranged along the circumferential direction of the inner pipe (1). 5. The slag discharge device according to any one of claims 1 to 4, characterized in that it also includes a lower connection mechanism (6), a lower slewing bearing (72), a second outer pipe (8) and a support wing (9 );in, The lower end of the inner tube (1) is connected to the drilling tool (12) through the lower connecting mechanism (6); the lower connecting mechanism (6) is coaxially linked with the inner tube (1), and along The axial direction of the inner tube (1) can be moved; The inner ring of the lower slewing bearing (72) is connected with the lower connecting mechanism (6), and the outer ring is connected with the second outer pipe (8); The hinged ends of the support wings (9) are respectively hinged to the first outer tube (2) and the second outer tube (8). 6. The slag discharge device according to claim 5, characterized in that, the lower connection mechanism (6) includes a first connection part (61), the first connection part (61) and the inner pipe ( 1) Key connection, and the key slots and key strips of the key connection are arranged along the axial direction of the inner tube (1). 7. The slag discharge device according to claim 6, characterized in that, the outer wall of the inner pipe (1) is provided with key strips, and the first connecting part (61) is sleeved on the inner pipe (1) On the outer periphery of the lower part, the inner wall of the first connecting part (61) is provided with a key groove adapted to the key bar. 8. The slag discharge device according to claim 6, characterized in that, the lower connecting mechanism (6) further includes a connecting plate (62), and the connecting plate (62) and the upper and lower slewing bearings (72) The inner ring is connected; the connecting plate (62) is provided with a through hole for the lower slag discharge pipe (4) to pass through, and the other end of the lower slag discharge pipe (4) extends into the inside the drilling tool (12). 9. The slag discharge device according to claim 5, characterized in that, the support wing (9) comprises: a support plate (91), an upper hinge rod (92) and a lower hinge rod (93); the upper hinge The hinged end of the rod (92) is hinged with the inner tube (1), and the other end is connected with the support plate (91); the hinged end of the lower hinged rod (93) is hinged with the second outer tube (8), The other end is connected with the support plate (91). 10. A rotary drilling rig, characterized in that it is provided with the slag discharge device according to any one of claims 1 to 9.

Images