Self-adaptive slip

Abstract

A self-adaptive slip relates to the technical field of drill rod clamping and is characterized in that a support is provided with a claw in each of two arc grooves, the right side of each claw is an arc surface, the arc surfaces are in clearance fit with the arc grooves, the left side of each claw is fixedly connected with a rubber body in a vulcanized manner, the rubber body is totally contained in the claw except the left side, and a row of clamping strips are fixed on the left side of the rubber body in a vulcanized manner. The drill rod clamping device has the beneficial effects that the clamping faces of the two clamping jaws are attached to the outer circle of a drill rod, due to the fact that the clamping strips are flexibly connected to the rubber body, along with the larger and larger clamping force of the two supports, due to the incompressibility of hydraulic oil, the clamping strips moving towards the inner side can cause other clamping strips to move outwards, and the drill rod is clamped. Each clamping strip starts to respectively clamp the drill rod along with the appearance curve of the drill rod, so that the clamping surface can automatically adapt to drill rods with different diameters in a certain range, and meanwhile, the flexibly connected clamping strips can also adapt to roundness deviation caused by surface damage of the drill rod.

Description

Technical Field

[0001] The invention relates to the technical field of drill rod clamping, and in particular to an adaptive slip. Background Art

[0002] For drilling equipment such as trenchless horizontal directional drilling rigs, the front and rear sections of the drill pipe need to be clamped during installation and removal. The slip mechanism is generally a left-right symmetrical structure, which uses a hydraulic cylinder to push the left and right slip bodies to move relative to each other to clamp the drill pipe. The slip structure is only suitable for drill pipes of one diameter, but in actual applications, drill pipes have multiple diameters. Different slips need to be replaced when using drill pipes of different specifications. Even drill pipes with similar diameters need to be replaced, which causes inconvenience in construction and low efficiency. Summary of the invention

[0003] In order to solve the problem of frequent replacement of slips in current trenchless horizontal directional drilling rigs, the present invention provides an adaptive slip.

[0004] The technical solution provided by the present invention is: an adaptive slip, comprising a support, two symmetrical arc grooves are formed on the left end surface of the support, the two arc grooves are formed so that the support forms a cover plate on the upper side of the arc groove and a support plate on the lower side, a clamping claw is installed in each of the two arc grooves, the right side of the clamping claw is an arc surface, the arc surface and the arc groove are gap-matched, a through hole B is formed on the clamping claw, and a through hole A is formed on the support at a position corresponding to the through hole B, the clamping claw and the support are connected by a pin shaft, and the pin shaft passes through the through hole A and the through hole B; The left side of the clamping claw is vulcanized and fixed to the rubber body. The rubber body is entirely contained in the clamping claw except the left side. A row of clamping strips is vulcanized and fixed to the left side of the rubber body. The clamping strips are vertically arranged up and down. Multiple clamping strips form an arc-shaped clamping surface. The clamping surfaces of the two clamping claws have a center. The rubber body is provided with a cavity inside the clamping strip, and the cavity is filled with hydraulic oil. The wrap angle of the arc groove is that the left side of the arc groove crosses the vertical center line of the two claws, and the right side of the arc groove crosses the horizontal center line of the claws.

[0005] The support is provided with an upper baffle plate on the upper side of the claw, and the support is provided with a lower baffle plate on the lower side of the claw. The upper baffle plate and the lower baffle plate have the same structure. The upper baffle plate is located between the claw and the cover plate, and the lower baffle plate is located between the claw and the support plate. The upper baffle plate and the lower baffle plate are both provided with a through hole C to accommodate the pin shaft to pass through. The upper baffle plate, the lower baffle plate and the claw are fixedly connected by a locating pin. The left end faces of the upper baffle plate and the lower baffle plate are arc-shaped, and the left end face edges of the upper baffle plate and the lower baffle plate press half the width of the clamping strip.

[0006] Adjacent clamping strips do not contact each other, and rubber bodies are vulcanized between adjacent clamping strips.

[0007] The left end faces of the cover plate and the support plate are provided with a notch, and the notch allows the clamping surface of the clamping claw to be opened.

[0008] A compression spring is arranged between the two claws.

[0009] The beneficial effects of the present invention are as follows: when clamping the drill rod, the two supports move toward the drill rod from both sides, and the clamping surfaces of the two clamping claws are attached to the outer circle of the drill rod. Since the clamping strip is flexibly connected to the rubber body, due to the incompressibility of the hydraulic oil, the clamping strip moving inward will cause other clamping strips to move outward, and each clamping strip begins to clamp the drill rod respectively along the outer curve of the drill rod, so the clamping surface can automatically adapt to drill rods of different diameters within a certain range. At the same time, the flexibly connected clamping strip can also adapt to the roundness deviation caused by surface damage of the drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 It is a schematic diagram of the structure of the present invention; Attached Figure 2 Yes Figure 1 AA section view; Attached Figure 3 It is a structural schematic diagram of the clamping claw in the present invention; Attached Figure 4 Yes Figure 3 A magnified view of point B; Attached Figure 5 It is a structural schematic diagram of the support in the present invention; Attached Figure 6 It is a structural schematic diagram of the upper baffle in the present invention In the figure, 1-support, 101-arc groove, 102-notch, 103-through hole A, 104-support plate, 105-cover plate, 2-claw, 201-arc surface, 202-through hole B, 203-rubber body, 204-clamping strip, 205-clamping surface, 206-cavity, 3-pin shaft, 4-upper baffle, 401-left end surface, 402-through hole C, 5-lower baffle, 6-locating pin, 7-compression spring. DETAILED DESCRIPTION

[0011] like Figures 1 to 6 As shown, an adaptive slip comprises a support 1, the left end face of the support 1 is provided with two symmetrical arc grooves 101, the two arc grooves 101 are provided so that the support 1 forms a cover plate 105 on the upper side of the arc grooves and a support plate 104 on the lower side, a claw 2 is installed in each of the two arc grooves 101 of the support 1, the right side of the claw 2 is an arc surface 201, the arc surface 201 and the arc groove 101 are clearance-matched, a through hole B202 is provided on the claw 2, a through hole A103 is provided on the support 1 at a position corresponding to the through hole B202, the claw 2 and the support 1 are connected by a pin shaft 3, and the pin shaft 3 passes through the through hole A103 and the through hole B202; The left side of the clamping jaw 2 is vulcanized and fixedly connected to the rubber body 203. The rubber body 203 is entirely contained in the clamping jaw 2 except for the left side. A row of clamping strips 204 are vulcanized and fixedly connected to the left side of the rubber body 203. The clamping strips 204 are vertically arranged up and down. A plurality of clamping strips 204 form an arc-shaped clamping surface 205. The clamping surfaces 205 of the two clamping jaws 2 have a center. The rubber body 203 is provided with a cavity 206 on the inner side of the clamping strip 204. The cavity 206 is filled with hydraulic oil. The wrap angle of the arc groove 101 is that the left side of the arc groove 101 crosses the vertical center lines of the two claws 2 , and the right side of the arc groove 101 crosses the horizontal center lines of the claws 2 .

[0012] When clamping the drill pipe, the two supports 1 move toward the drill pipe from both sides, and the clamping surfaces 205 of the two claws 2 are attached to the outer circle of the drill pipe. Since the clamping strips 204 are flexibly connected to the rubber body 203 and due to the incompressibility of the hydraulic oil, the clamping strips 204 moving inward will cause other clamping strips 204 to move outward, and each clamping strip 204 begins to clamp the drill pipe respectively along the outer curve of the drill pipe. Therefore, the clamping surface 205 can automatically adapt to drill pipes of different diameters within a certain range. At present, a set of slips can achieve a drill pipe diameter range of 60-76. At the same time, the flexibly connected clamping strips 204 can also adapt to the roundness deviation caused by surface damage of the drill pipe.

[0013] The support 1 is provided with an upper baffle 4 on the upper side of the claw 2, and the support 1 is provided with a lower baffle 5 on the lower side of the claw 2. The upper baffle 4 and the lower baffle 5 have the same structure. The upper baffle 4 is located between the claw 2 and the cover plate 105, and the lower baffle 5 is located between the claw 2 and the support plate 104. The upper baffle 4 and the lower baffle 5 are both provided with a through hole C402 to accommodate the passage of the pin shaft 3. The upper baffle 4, the lower baffle 5 and the claw 2 are fixedly connected by a locating pin 6. The left end faces 401 of the upper baffle 4 and the lower baffle 5 are arc-shaped. The edges of the left end faces 401 of the upper baffle 4 and the lower baffle 5 press half the width of the clamping strip 204 to limit the upper and lower positions of the clamping strip 204.

[0014] There is no contact between adjacent clamping strips 204 , and a rubber body 203 is vulcanized between adjacent clamping strips 204 , so that the clamping strips 204 have space to move.

[0015] A notch 102 is formed on the left side end surface of the cover plate 105 and the support plate 104 , and the notch 102 allows the clamping surface 205 of the clamping claw 2 to be opened.

[0016] A compression spring 7 is provided between the two clamping claws 2. In the absence of external force, the two clamping claws 2 are open.

Claims

1. An adaptive slip, comprising a support (1), characterized in that: The support (1) has two symmetrical arc grooves (101) on its left end surface. The two arc grooves (101) are formed so that the support (1) forms a cover plate (105) on the upper side of the arc grooves and a support plate (104) on the lower side. The support (1) is provided with a clamping claw (2) in each of the two arc grooves (101). The right side of the clamping claw (2) is an arc surface (201). The arc surface (201) and the arc groove (101) are clearance-matched. The clamping claw (2) has a through hole B (202) that passes through from top to bottom. The support (1) has a through hole A (103) at a position corresponding to the through hole B (202). The clamping claw (2) and the support (1) are connected via a pin shaft (3). The pin shaft (3) passes through the through hole A (103) and the through hole B (202). The left side of the clamping claw (2) is vulcanized and fixedly connected to the rubber body (203). The rubber body (203) is entirely contained in the clamping claw (2) except for the left side. A row of clamping strips (204) are vulcanized and fixedly connected to the left side of the rubber body (203). The clamping strips (204) are vertically arranged up and down. A plurality of clamping strips (204) form an arc-shaped clamping surface (205). The clamping surfaces (205) of the two clamping claws (2) have a center. The rubber body (203) is provided with a cavity (206) on the inner side of the clamping strip (204). The cavity (206) is filled with hydraulic oil. The wrap angle of the circular arc groove (101) is such that the left side of the circular arc groove (101) crosses the vertical center lines of the two claws (2), and the right side of the circular arc groove (101) crosses the horizontal center line of the claws (2).

2. The adaptive slip according to claim 1, characterized in that: The support (1) is provided with an upper baffle (4) on the upper side of the clamping claw (2), and the support (1) is provided with a lower baffle (5) on the lower side of the clamping claw (2). The upper baffle (4) and the lower baffle (5) have the same structure. The upper baffle (4) is located between the clamping claw (2) and the cover plate (105), and the lower baffle (5) is located between the clamping claw (2) and the support plate (104). Both the upper baffle (4) and the lower baffle (5) are provided with a through hole C (402) to accommodate the pin shaft (3) to pass through. The upper baffle (4), the lower baffle (5) and the clamping claw (2) are fixedly connected by a positioning pin (6). The left end faces (401) of the upper baffle (4) and the lower baffle (5) are in an arc shape, and the edges of the left end faces (401) of the upper baffle (4) and the lower baffle (5) press half the width of the clamping strip (204).

3. The adaptive slip according to claim 1, characterized in that: Adjacent clamping strips (204) are not in contact with each other, and rubber bodies (203) are vulcanized between adjacent clamping strips (204).

4. The adaptive slip according to claim 1, characterized in that: A notch (102) is formed on the left end faces of the cover plate (105) and the support plate (104), and the notch (102) allows the clamping surface (205) of the clamping claw (2) to be opened.

5. The adaptive slip according to claim 1, characterized in that: A compression spring (7) is provided between the two claws (2).

Images