A needle-tube extrusion drill bit for rotary drilling rig

Abstract

The present invention discloses a needle-tube extrusion drill bit for a rotary drilling rig, comprising a drill barrel, the upper end of the drill barrel being fixedly connected to a square head upper plate assembly, a slag discharge part being movably connected to the drill barrel, the clamping part comprising a pressure rod slidably connected to the upper plate, the clamping spring being sleeved on the pressure rod, and the pressure rod comprising at least one long pressure rod and a short pressure rod; the slag discharge part comprises a slag discharge plate slidably connected to the drill barrel up and down, the upper end of the slag discharge plate being connected to the bottom end of the short pressure rod, the present invention connects the pressure rod and the slag discharge plate through long, middle and short joints, when the drill bit is lifted out of the hole, the disc on the drill rod presses down the pressure plate to push the pressure rod and thus push the slag discharge plate, thereby quickly pushing the slag in the drill barrel out of the drill barrel, and can be used for different soil layers, with low noise and a wide range of applications; in addition, the drill bit is easy to construct, there is no need to change the operating habits of the drilling rig, the construction efficiency is high, cost is saved, and economic benefits are improved.

Description

Technical Field

[0001] The invention relates to the technical field of drill bits for rotary drilling rigs, in particular to a pin-tube type extrusion drill bit for rotary drilling rigs. Background Art

[0002] With the development of science and technology, pile foundations are widely used in subway construction, stations, airports, and housing construction due to their large bearing capacity and stable structure. However, it is difficult to control the noise during the construction of existing pile drivers. The commonly used methods are: quickly rotating the drill rod forward and backward to drive the drill bit to throw out the debris; using the main cable to quickly retract and release to shake out the debris in the drill bit.

[0003] However, from the perspective of the currently commonly used construction, its defects mainly include the following aspects: 1. Long-term shaking of the main cable will accelerate the aging of the cable. 2. For the clay layer, it is difficult to throw out the slag, which is inefficient. 3. Rapid rotation of the drill rod will produce huge noise. Summary of the invention

[0004] The object of the present invention is to provide a needle-tube extrusion drill bit for a rotary drilling rig to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A needle-tube extrusion drill bit for a rotary drilling rig comprises a drill barrel, a cutting portion is arranged at the lower end of the drill barrel, a square head and a plate assembly is fixedly connected to the upper end of the drill barrel, a slag discharge portion is movably connected in the drill barrel, the slag discharge portion is located above the cutting portion and is slidably connected to the square head and a plate assembly through a pressing portion;

[0007] The square head and plate assembly comprises an upper plate fixedly connected to the drill tube, an end of the upper plate away from the drill tube is fixedly connected to a square head, and a square opening is formed on the square head and the upper plate;

[0008] The clamping part includes a pressure rod slidably connected to the upper plate, the top end of the pressure rod is slidably connected to the square head upper plate assembly through a pressure rod sleeve, a pressure spring is arranged between the pressure rod and the upper plate, the pressure spring is sleeved on the pressure rod, and the pressure rod includes at least one long pressure rod and one short pressure rod;

[0009] The cutting part comprises a cutting disc, one end of the cutting disc away from the drill tube is connected with cutting teeth, the upper end of the cutting disc is connected with a bottom plate, the bottom plate is clamped with the lower end of the drill tube, and the bottom plate is connected with the bottom end of the long pressure rod;

[0010] The slag discharge part comprises a slag discharge plate slidably connected to the drill tube up and down, a cone head is fixedly connected to the lower end of the slag discharge plate, and the upper end of the slag discharge plate is connected to the bottom end of the short pressure rod.

[0011] As a further solution of the present invention: at least one through hole is provided on the drill tube, and a drill tube arc notch and a clamping notch are provided at the position where the lower end of the drill tube is connected to the bottom plate.

[0012] As a further solution of the present invention: the square head is surrounded by a rectangular structure, a clamp is fixedly connected to the corner of the upper end of the square head, and an outer rib plate is fixedly connected between the upper plate and the square head.

[0013] As a further solution of the present invention: the square head is fixedly connected to a limiting block, the pressure rod sleeve is fixedly connected to the limiting block, the top end of the compression spring is fixedly connected to a pressure rod nut, and the pressure rod nut is located at the lower end of the limiting block.

[0014] As a further solution of the present invention: two short pressure rods are provided, and the short pressure rods pass through the lower end of the upper plate and are connected to a short joint. The lower end of the short joint is connected to the slag discharge plate through a middle joint and a long joint. The slag discharge plate is fixedly connected to a lifting ear, and the lower end of the long joint is rotatably connected to the lifting ear.

[0015] As a further solution of the present invention: the long pressure rod is provided with one, the long pressure rod passes through the upper plate and the slag discharge plate and is connected to the bottom plate through a connecting hook, a pressure relief hole is provided on the outside of the long pressure rod, and the pressure relief hole is fixedly connected to the inner wall of the drill barrel.

[0016] As a further solution of the present invention: a circular hole is opened on the slag discharge plate, a cover plate is fixedly connected to the lower end of the slag discharge plate, and the cover plate is fixedly connected to the lower end of the circular hole.

[0017] As a further solution of the present invention: the upper end of the base plate is fixedly connected with a door-shaped frame, and the door-shaped frame is clamped in the clamping notch at the lower end of the drill barrel; the upper end of the base plate is fixedly connected with an inclined sleeve and a shaft sleeve, and the inclined sleeve and the shaft sleeve are connected through a corner shaft, and the inclined sleeve and the shaft sleeve are clamped in the arc-shaped notch of the drill barrel at the lower end of the drill barrel; a drill barrel arc plate is connected to the corner shaft, and the drill barrel arc plate is clamped in the arc-shaped notch of the drill barrel.

[0018] As a further solution of the present invention: the cutting teeth include a first tooth plate, a second tooth plate and a third tooth plate, and two side shovels are symmetrically arranged at the outer edge of the cutting disc.

[0019] As a further solution of the present invention: the first tooth plate and the second tooth plate are radially symmetrical at the fixed points on the cutting disk, the bases of the first tooth plate and the second tooth plate are both triangular structures, four picks are installed on the first tooth plate, and five picks are installed on the second tooth plate. The picks on the first tooth plate and the second tooth plate are arranged obliquely to the cutting disk and the orientations of the picks on the first tooth plate and the second tooth plate are different, and two picks with different orientations are provided at the lower end of the third tooth plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention connects the pressure rod and the slag plate through long, medium and short joints. When the drill bit is lifted out of the hole, the disc on the drill rod presses down the pressure plate to push the pressure rod and thus push the slag plate, so that the slag in the drill tube can be quickly pushed out of the drill tube. It can be used for different soil layers, has low noise and a wide range of applications. In addition, the drill bit is easy to construct, does not need to change the operating habits of the drilling rig, has high construction efficiency, saves costs and improves economic benefits.

[0022] 2. The outer wall of the drill tube of the present invention is provided with wear-resistant strips and a reamer, which plays a great role in ensuring the hole diameter. The wear-resistant strips also enhance the strength of the drill tube.

[0023] 3. The invention produces little noise during construction and can be used normally in places where noise control is high. It has strong applicability, can effectively avoid noise pollution caused by construction, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of this embodiment;

[0025] Figure 2 It is an exploded schematic diagram of this embodiment;

[0026] Figure 3 This is a schematic diagram of the square head assembly structure of this embodiment;

[0027] Figure 4 Schematic diagram of the cutting disc structure of this embodiment.

[0028] In the figure:

[0029] 1-drill barrel, 11-through hole, 12-drill barrel arc notch, 13-clamping notch, 14-drill barrel arc plate;

[0030] 2-square head upper plate assembly; 21-upper plate, 22-outer rib plate, 23-square head, 24-hoop, 25-square opening;

[0031] 3-slag discharge part, 31-cone head, 32-slag discharge plate, 33-opening, 34-lifting ear, 35-cover plate;

[0032] 4-cutting part, 41-cutting disc, 42-cutting teeth, 421-first tooth plate, 422-second tooth plate, 423-third tooth plate, 43-side shovel, 44-bottom plate, 45-oblique sleeve, 46-shaft sleeve, 47-corner shaft, 48-door frame, 49-connecting hook;

[0033] 5-pressing part, 51-pressing spring, 52-pressing rod nut, 53-pressing rod sleeve, 54-long pressing rod, 55-short pressing rod, 56-pressure relief hole, 57-middle joint, 58-long joint, 59-short joint;

[0034] 6-drill barrel accessories, 61-wear strips, 62-reamer. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-4 In an embodiment of the present invention, a needle-tube extrusion drill bit for a rotary drilling rig comprises a drill tube 1, a cutting portion 4 is provided at the lower end of the drill tube 1, a square head upper plate assembly 2 is fixedly connected to the upper end of the drill tube 1, a slag discharge portion 3 is movably connected in the drill tube 1, and the slag discharge portion 3 is located above the cutting portion 4 and is slidably connected to the square head upper plate assembly 2 through a pressing portion 5;

[0037] At least one through hole 11 is provided on the drill tube 1. In this embodiment, two through holes 11 are symmetrically provided on the drill tube 1. Through the through holes 11, exhaust and drainage are performed. The position where the lower end of the drill tube 1 is connected to the bottom plate 44 is provided with a drill tube arc notch 12 and a clamping notch 13.

[0038] The square head and plate assembly 2 includes an upper plate 21 fixedly connected to the drill tube 1, and a square head 23 is fixedly connected to one end of the upper plate 21 away from the drill tube 1. The square head 23 is surrounded by a rectangular structure, and a clamp 24 is fixedly connected to the corner of the upper end of the square head 23. Four clamps 24 are provided and are connected and fixed to the four corners of the square head 23 in sequence, thereby strengthening the strength of the square head 23. An outer rib plate 22 is fixedly connected between the upper plate 21 and the square head 23, and the outer rib plate 22 provides additional support for the square head 23, thereby ensuring the stability of the square head 23. A square opening 25 is opened on the square head 23 and the upper plate 21 for connecting with the drill rod so as to drive the drill bit to rotate through the drill rod;

[0039] The clamping part 5 includes a pressure rod slidably connected to the upper plate 21, the top end of the pressure rod is slidably connected to the square head plate assembly 2 through a pressure rod sleeve 53, a limited block is fixedly connected to the square head 23, the pressure rod sleeve 53 is fixedly connected to the limit block, a pressure spring 51 is provided between the pressure rod and the upper plate 21, the pressure spring 51 is sleeved on the pressure rod, the top end of the pressure spring 51 is fixedly connected to a pressure rod nut 52, the pressure rod nut 52 is located at the lower end of the limit block, the pressure rod includes at least one long pressure rod 54 and one short pressure rod 55, in this embodiment, two short pressure rods 55 are provided, the short pressure rod 55 passes through the lower end of the upper plate 21 and is connected to a short joint 59, the lower end of the short joint 59 is connected to the middle joint 57 and the long joint 58 The slag plate 32 is connected, and the slag plate 32 is fixedly connected with a lifting ear 34. The lower end of the long joint 58 is rotatably connected with the lifting ear 34, and then the slag plate 32 can be pushed downward in the drill tube 1 through the short pressure rod 55, the short joint 59, the middle joint 57, and the long joint 58, so as to discharge the mud residue in the drill tube 1. The long pressure rod 54 is provided with a pressure relief hole 56 on the outside of the long pressure rod 54, and the pressure relief hole 56 is fixedly connected with the inner wall of the drill tube 1. In this embodiment, the pressure relief hole 56 is a V-shaped structure, and the upper plate 21 and the slag plate 32 are both provided with a V-shaped notch for the pressure relief hole 56 to pass through;

[0040] The cutting portion 4 includes a cutting disk 41, and a cutting tooth 42 is connected to the end of the cutting disk 41 away from the drill tube 1. The cutting tooth 42 includes a first tooth plate 421, a second tooth plate 422 and a third tooth plate 433. Two side shovels 43 are symmetrically arranged at the outer edge of the cutting disk 41. The bases of the first tooth plate 421 and the second tooth plate 422 are both triangular structures. The first tooth plate 421 and the second tooth plate 422 are radially symmetrical at a fixed point on the cutting disk 41. Four picks are installed on the first tooth plate 421, and five picks are installed on the second tooth plate 422. The picks on the first tooth plate 421 and the second tooth plate 422 are arranged obliquely with respect to the cutting disk 41, and the orientations of the picks on the first tooth plate 421 and the second tooth plate 422 are different, that is, the picks on the first tooth plate 421 are inclined in the clockwise direction, and the picks on the second tooth plate 422 are inclined in the clockwise direction. The cutting teeth on the cutting plate are inclined in the counterclockwise direction, and the lower end of the third tooth plate 433 is provided with two cutting teeth with different directions, and the directions of the two cutting teeth are respectively the same as those on the first tooth plate 421 and the second tooth plate 422. The upper end of the cutting disc 41 is connected to a bottom plate 44, and a long screw is fixedly connected to the middle part of the upper end of the cutting disc 41. The bottom plate 44 is sleeved on the long screw and fastened by a nut. The upper end of the bottom plate 44 is fixedly connected to a door frame 48, and the door frame 48 is clamped in the clamping notch 13 at the lower end of the drill barrel 1. The upper end of the bottom plate 44 is fixedly connected to an inclined sleeve 45 and a shaft sleeve 46, and the inclined sleeve 45 and the shaft sleeve 46 are connected by a corner shaft 47. The inclined sleeve 45 and the shaft sleeve 46 are clamped in the drill barrel arc notch 12 at the lower end of the drill barrel 1. The corner shaft 47 is connected to a drill barrel arc plate, and the drill barrel arc plate is clamped in the drill barrel arc notch 12;

[0041] The slag discharge part 3 includes a slag discharge plate 32 which is slidably connected to the drill tube 1 up and down. The lower end of the slag discharge plate 32 is fixedly connected to a cone head 31. The upper end of the slag discharge plate 32 is connected to the bottom end of the short pressure rod 55. A circular hole is opened on the slag discharge plate 32. The lower end of the slag discharge plate 32 is fixedly connected to a cover plate 35, and the cover plate 35 is fixedly connected to the lower end of the circular hole.

[0042] The present invention has a novel structure and stable operation. When the present invention is in use, when rotary drilling is required, the drill rod of the rotary drilling machine is passed through the square opening 25 of the square head upper plate assembly 2, and then the drill rod is connected to the drill bit through the square head 23, and then the drill bit is driven to rotate by the drill rod to perform rotary drilling. During the drilling process, mud residue will accumulate in the drill bit, which needs to be cleaned in time to ensure the continuous working ability of the drill bit. When mud residue accumulates in the drill bit, the drill bit is lifted out of the cast-in-place pile and moved to the periphery of the pile well through the drill rod, and then the short pressure rod 55 and the long pressure rod 54 are pressed down by the disc on the drill rod. The long pressure rod 54 pushes the bottom plate 44 and the cutting disc 41 to move downward, and opens the lower end of the drill barrel 1. At the same time, the short pressure rod 55 pushes the slag discharge plate 32 to move downward, and then the mud residue in the drill barrel 1 is pushed to the outside of the drill barrel 1, and the cleaning of the residue in the drill barrel 1 is completed.

[0043] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A needle-tube extrusion drill bit for a rotary drilling rig, comprising a drill barrel (1), characterized in that: The lower end of the drill tube (1) is provided with a cutting portion (4), the upper end of the drill tube (1) is fixedly connected to a square head upper disk assembly (2), and a slag discharge portion (3) is movably connected inside the drill tube (1). The slag discharge portion (3) is located above the cutting portion (4) and is slidably connected to the square head upper disk assembly (2) via a pressing portion (5); The square head upper plate assembly (2) comprises an upper plate (21) fixedly connected to the drill tube (1), a square head (23) being fixedly connected to one end of the upper plate (21) away from the drill tube (1), and a square opening (25) being provided on the square head (23) and the upper plate (21); The clamping part (5) comprises a pressure rod slidably connected to the upper plate (21), the top end of the pressure rod is slidably connected to the square head upper plate assembly (2) through a pressure rod sleeve (53), a pressure spring (51) is provided between the pressure rod and the upper plate (21), the pressure spring (51) is sleeved on the pressure rod, and the pressure rod comprises at least one long pressure rod (54) and one short pressure rod (55); The cutting portion (4) comprises a cutting disc (41), one end of the cutting disc (41) away from the drill tube (1) is connected to a cutting tooth (42), the upper end of the cutting disc (41) is connected to a bottom plate (44), the bottom plate (44) is clamped to the lower end of the drill tube (1), and the bottom plate (44) is connected to the bottom end of the long pressure rod (54); The slag discharge part (3) comprises a slag discharge plate (32) connected to the drill tube (1) in an upward and downward sliding manner, the lower end of the slag discharge plate (32) is fixedly connected to a cone head (31), and the upper end of the slag discharge plate (32) is connected to the bottom end of the short pressure rod (55); Two short pressure rods (55) are provided. The short pressure rods (55) pass through the lower end of the upper plate (21) and are connected to a short joint (59). The lower end of the short joint (59) is connected to the slag discharge plate (32) through a middle joint (57) and a long joint (58). The slag discharge plate (32) is fixedly connected to a lifting lug (34). The lower end of the long joint (58) is rotatably connected to the lifting lug (34). The long pressure rod (54) is provided with one. The long pressure rod (54) passes through the upper plate (21) and the slag discharge plate (32) and is connected to the bottom plate (44) through a connecting hook (49). A pressure relief hole (56) is provided on the outer side of the long pressure rod (54). The pressure relief hole (56) is fixedly connected to the inner wall of the drill pipe (1).

2. The needle-tube extrusion drill bit for a rotary drilling rig according to claim 1, characterized in that: At least one through hole (11) is provided on the drill tube (1), and a drill tube arc-shaped notch (12) and a clamping notch (13) are provided at the position where the lower end of the drill tube (1) is connected to the bottom plate (44).

3. The needle-tube extrusion drill bit for a rotary drilling rig according to claim 1, characterized in that: The square head (23) forms a rectangular structure, a clamp (24) is fixedly connected to the corner of the upper end of the square head (23), and an outer rib plate (22) is fixedly connected between the upper plate (21) and the square head (23).

4. The needle-tube extrusion drill bit for a rotary drilling rig according to claim 1, characterized in that: The square head (23) is fixedly connected to a limit block, the pressure rod sleeve (53) is fixedly connected to the limit block, the top end of the compression spring (51) is fixedly connected to a pressure rod nut (52), and the pressure rod nut (52) is located at the lower end of the limit block.

5. The needle-tube extrusion drill bit for a rotary drilling rig according to claim 1, characterized in that: A circular hole is formed on the slag discharge plate (32), and a cover plate (35) is fixedly connected to the lower end of the slag discharge plate (32), wherein the cover plate (35) is fixedly connected to the lower end of the circular hole.

6. The needle-tube extrusion drill bit for a rotary drilling rig according to claim 2, characterized in that: The upper end of the base plate (44) is fixedly connected to a door-shaped frame (48), and the door-shaped frame (48) is clamped in a clamping notch (13) at the lower end of the drill barrel (1). The upper end of the base plate (44) is fixedly connected to an inclined sleeve (45) and a shaft sleeve (46), and the inclined sleeve (45) and the shaft sleeve (46) are connected via a corner shaft (47). The inclined sleeve (45) and the shaft sleeve (46) are clamped in a drill barrel arc notch (12) at the lower end of the drill barrel (1). A drill barrel circular arc plate is connected to the corner shaft (47), and the drill barrel circular arc plate is clamped in the drill barrel arc notch (12).

7. The needle-tube extrusion drill bit for a rotary drilling rig according to claim 1, characterized in that: The cutting teeth (42) include a first tooth plate (421), a second tooth plate (422) and a third tooth plate (433), and two side shovels (43) are symmetrically arranged at the outer edge of the cutting disc (41).

8. The needle-tube extrusion drill bit for a rotary drilling rig according to claim 7, characterized in that: The first tooth plate (421) and the second tooth plate (422) are radially symmetrical at a fixed point on the cutting disk (41); the bases of the first tooth plate (421) and the second tooth plate (422) are both triangular structures; four cutting teeth are installed on the first tooth plate (421) and five cutting teeth are installed on the second tooth plate (422); the cutting teeth on the first tooth plate (421) and the second tooth plate (422) are arranged obliquely with respect to the cutting disk (41) and the orientations of the cutting teeth on the first tooth plate (421) and the second tooth plate (422) are different; and the lower end of the third tooth plate (433) is provided with two cutting teeth with different orientations.

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