Hydraulic casing power tongs for petroleum energy exploitation

Abstract

The invention relates to the technical field of power tongs, and discloses a hydraulic casing power tong for petroleum energy exploitation, which comprises a tong head and an oil cylinder, the oil cylinder is fixedly mounted on the tong head, the end of the tong head far away from the oil cylinder is open, a mold is mounted in the tong head from an opening, the bottom in the opening is provided with an overturning groove, and the top in the opening is provided with a locking groove. The bottom end of the locking block is installed in the overturning groove through a lower overturning assembly, a locking screw rod is installed at the top end of the locking block, when the locking block is overturned upwards, the locking screw rod slides into the locking groove, the locking nut is installed on the locking screw rod, and the locking block abuts against the mold. According to the hydraulic casing pipe power tongs for petroleum energy exploitation, compared with a plug pin, direct insertion is not needed, the locking block can be disassembled and assembled only through overturning, due to the fact that the locking groove and the overturning groove communicate with the opening, due to the open groove type arrangement, no hiding space exists in sand grains, the sand grains cannot be blocked in the open groove type arrangement, and fixing is stable.

Description

Technical Field

[0001] The invention relates to the technical field of power tongs, in particular to a hydraulic casing power tong used in petroleum energy development. Background Art

[0002] Chinese patent document CN214997527U discloses a hydraulic casing power tongs for oil energy development, including a tongs head, a mold, a cylinder and a handle, both sides of the bottom end of the tongs head are provided with limit holes, and the inside of the tongs head is movably connected with the mold, one side of the tongs head is movably connected with a latch, and the top of the latch is fixedly connected with a pull head, one side of the tongs head is fixedly connected with a cylinder, and the top of the cylinder is movably connected with a pressure rod, one side of the cylinder is movably connected with a sleeve rod, and one side of the top of the sleeve rod is fixedly connected with a hollow block. The hydraulic casing power tongs is provided with a sleeve rod outside the connecting rod, and the sleeve rod can slide outside the connecting rod, so that the overall length between the connecting rod and the sleeve rod can be adjusted. At this time, the limit bolt can be rotated inside the fixing nut, and the limit bolt can move inside the fixing nut and be inserted into the jack at this position, so as to fix the position of the sleeve rod, and the use length of the handle can be adjusted according to demand. The mold in the hydraulic casing power tongs is fixed to the tongs head by a pin. The purpose of setting the pin is to achieve the fixation and unlocking of the mold. However, in actual use, the insertion and removal of the pin need to be vertically facing. In addition, due to the influence of dust and sediment in the mining area, if sand blocks the limit hole, it will not only be difficult to remove, but the spring cannot drive the limit head to reset in time, which will also cause the pin to be unstable. Summary of the invention

[0003] To achieve the above-mentioned purpose, the present invention discloses a hydraulic casing power tongs for oil energy exploitation, comprising a tongs head and an oil cylinder, wherein the oil cylinder is fixedly mounted on the tongs head, the tongs head is arranged in an open type away from the oil cylinder end, the mold is installed in the tongs head from the open end, a turning groove is provided at the bottom of the open end, a locking groove is provided at the top of the open end, the bottom end of the locking block is installed in the turning groove through a lower turning assembly, a locking screw is installed at the top of the locking block, when the locking block is turned up, the locking screw slides into the locking groove, the locking nut is installed on the locking screw, and the locking block is set against the mold.

[0004] Preferably, the connecting rod is installed on the end of the oil cylinder away from the clamp head, and the pressure rod is movably connected to the oil cylinder and arranged close to the connecting rod.

[0005] Preferably, the bottom and top of the opening are also provided with limiting slide grooves to facilitate the sliding of the mold, the width of the flip groove is greater than the limiting slide groove, the limiting slide groove is arranged to avoid the flip groove, the width of the locking groove is smaller than the limiting slide groove, and the locking groove is connected to the limiting slide groove.

[0006] Preferably, the bottom flip assembly comprises:

[0007] A left guide slot and a right guide slot, the left guide slot and the right guide slot are oppositely arranged on the inner wall of the flip slot, the right guide slot is connected to the side end of the clamp head, and when the locking block is flipped up to a horizontal state, it is covered on the left guide slot and the right guide slot;

[0008] A guide slider, the guide slider is slidably connected in the left guide slot, and the guide slider is fixedly connected to the locking block;

[0009] The cylindrical shell is slidably connected in the right guide slot, the cylindrical shell is fixedly connected to the locking block, and four retractable blocks are distributed in a circular array on the side end of the cylindrical shell. When the four blocks are extended, they are synchronously abutted against the inner wall of the right guide slot to limit the rotation of the cylindrical shell.

[0010] Preferably, the central fixed shaft extends into the cylindrical shell from the end away from the locking block and is connected to the side fixed seat, the side fixed seat is fixedly mounted on the inner wall of the cylindrical shell, four side slide groove circular arrays are distributed on the central fixed shaft, the side slider is slidably connected in the side slide groove, one end of the flip rod is rotatably mounted on the side slider, the other end of the flip rod is rotatably mounted on the clamping block, the inner screw sleeve is sleeved on the central fixed shaft, the inner screw sleeve is connected to each side slider through a side mounting frame, the side mounting frame is sleeved on the central fixed shaft, the outer screw sleeve is threadedly connected to the inner screw sleeve, the outer screw sleeve is sleeved on the central fixed shaft away from the inner screw sleeve end, and extends out of the side end of the pliers head.

[0011] Preferably, an auxiliary rotating rod is installed at the end of the outer screw sleeve away from the inner screw sleeve, and an auxiliary rotating block is installed at the end of the central fixed shaft away from the side fixed seat.

[0012] Preferably, a return spring 1 is connected between the side fixing seat and the clamping block.

[0013] Preferably, a second reset spring is provided near the end of the inner screw sleeve on the outer screw sleeve, one end of the second reset spring is connected to the side mounting frame, and the other end of the second reset spring is against an outer limit ring, which is integrally formed on the outer screw sleeve.

[0014] Preferably, the end of the central fixed shaft away from the side fixed seat is integrally formed with an outer limiting ring 2, and the end of the outer screw sleeve away from the inner screw sleeve is disposed on the outer limiting ring 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1The structure of the present invention is schematically shown Figure 1 ;

[0017] Figure 2 The open position section of the clamp head of the present invention is Figure 1 ;

[0018] Figure 3 This is a front cross-sectional view of the bottom flip assembly of the present invention. Figure 1 (When the card block is extended);

[0019] Figure 4 The side cross-section of the downward flip assembly of the present invention Figure 1 (When the card block is extended);

[0020] Figure 5 This is a front cross-sectional view of the bottom flip assembly of the present invention. Figure 2 (When the card block is in the retracted state);

[0021] Figure 6 The side cross-section of the downward flip assembly of the present invention Figure 2 (When the card block is in the retracted state);

[0022] Figure 7 It is a schematic diagram of the locking block of the present invention sliding in a direction away from the mold;

[0023] Figure 8 It is a schematic diagram of the locking block of the present invention in a state of flipping downward;

[0024] Fig. 9 The open position section of the clamp head of the present invention is Figure 2 .

[0025] In the figure: 10. pliers head; 11. oil cylinder; 12. mold; 13. open mouth; 14. flip groove; 15. locking groove; 16. locking block; 17. lower flip assembly; 18. locking screw; 19. locking nut; 20. connecting rod; 21. pressure rod; 22. left guide slide groove; 23. right guide slide groove; 24. guide slide block; 25. cylindrical shell; 26. block; 27. central fixed shaft; 28. side slide groove; 29. ​​side slide block; 30. flip rod; 31. side fixing seat; 32. inner screw sleeve; 33. side mounting bracket; 34. outer screw sleeve; 35. auxiliary rotating rod; 36. auxiliary rotating block; 37. reset spring one; 38. reset spring two; 39. outer limit ring one; 40. outer limit ring two. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0027] Example

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] like Figures 1 to 9 As shown, the present embodiment provides a hydraulic casing power tongs for oil energy development, comprising a tongs head 10 and a cylinder 11, wherein the cylinder 11 is fixedly mounted on the tongs head 10, and the tongs head 10 is open-ended away from the cylinder 11, and a mold 12 is mounted in the tongs head 10 from an opening 13, a turning groove 14 is provided at the bottom of the opening 13, a locking groove 15 is provided at the top of the opening 13, the bottom end of a locking block 16 is mounted in the turning groove 14 through a lower turning assembly 17, a locking screw 18 is mounted on the top of the locking block 16, and when the locking block 16 is turned up, the locking screw 18 slides into the locking groove 15, a locking nut 19 is mounted on the locking screw 18, and the locking block 16 is abutted against the mold 12.

[0030] The working principle and beneficial effects of the above technical solution are:

[0031] The present invention provides a hydraulic casing power tong for oil energy development. When the mold 12 needs to be replaced, after the locking nut 19 is loosened, the locking screw 18 is released from the locking groove 15, the locking block 16 is pulled, and the locking block 16 is flipped in the direction away from the oil cylinder 11 with the lower flip assembly 17 as the center, and the opening 13 is opened. After the mold 12 is replaced from the opening 13, the locking block 16 is pulled in the opposite direction, and the locking block 16 is flipped in the direction close to the oil cylinder 11 with the lower flip assembly 17 as the center, and the locking screw 18 slides into the locking groove 15, and the locking block 16 is set on the mold 12, and then the locking nut 19 is locked on the locking screw 18. The invention discloses a hydraulic casing power tong for oil energy exploitation. Compared with a latch, the locking block 16 can be assembled and disassembled by simply flipping it, without the need for a straight-on insertion. Moreover, because the locking groove 15 and the flipping groove 14 are both connected to the opening 13, such a slotted arrangement leaves no space for sand to hide therein and thus cannot be blocked therein, so that the fixing is stable.

[0032] In this embodiment, the connecting rod 20 is installed at the end of the oil cylinder 11 away from the clamp head 10 , and the pressure rod 21 is movably connected to the oil cylinder 11 and is arranged close to the connecting rod 14 .

[0033] The working principle and beneficial effects of the above technical solution are:

[0034] The connecting rod 20 is used to fix the oil cylinder 11 and the clamp head 10 connected to the oil cylinder 11 , while the pressure rod 21 is used for the operation of the oil cylinder 11 .

[0035] In this embodiment, the bottom and top of the opening 13 are also provided with limiting slide grooves to facilitate the sliding of the mold 12. The width of the flip groove 14 is greater than that of the limiting slide groove, and the limiting slide groove is arranged to avoid the flip groove 14. The width of the locking groove 15 is less than that of the limiting slide groove, and the locking groove 15 is connected to the limiting slide groove.

[0036] The working principle and beneficial effects of the above technical solution are:

[0037] The width of the flipping groove 14 is greater than that of the limiting slide groove, so as to facilitate the flipping of the bottom end of the locking block 16, and the width of the locking groove 15 is less than that of the limiting slide groove, so as to facilitate the locking screw 18 to slide into the locking groove 15. The setting of the opening 13 makes the pliers head 10 semi-open, and thus makes the flipping groove 14 and the locking groove 15 connected to the opening 13 both semi-open. In this way, there is no hiding space for sand particles in the flipping groove 14 and the locking groove 15, and thus they cannot be blocked in the flipping groove 14 and the locking groove 15.

[0038] In this embodiment, the lower flip assembly 17 includes:

[0039] The left guide slot 22 and the right guide slot 23 are oppositely disposed on the inner wall of the flip slot 14, and the right guide slot 23 is connected to the side end of the clamp head 10. When the locking block 16 is flipped up to a horizontal state, it is covered on the left guide slot 22 and the right guide slot 23;

[0040] A guide slider 24, the guide slider 24 is slidably connected in the left guide slot 22, and the guide slider 24 is fixedly connected to the locking block 16;

[0041] The cylindrical shell 25 is slidably connected in the right guide slot 23. The cylindrical shell 25 is fixedly connected to the locking block 16. Four retractable blocks 26 are distributed in a circular array on the side end of the cylindrical shell 25. When the four blocks 26 are extended, they are synchronously abutted against the inner wall of the right guide slot 23 to limit the rotation of the cylindrical shell 25.

[0042] The working principle and beneficial effects of the above technical solution are:

[0043] The left guide slot 22 and the right guide slot 23 are oppositely formed on the inner wall of the flip slot 14, and the slotting directions of the left guide slot 22 and the right guide slot 23 are parallel to the moving direction of the mold 12 in the pliers head 10. When the mold 12 needs to be replaced, after the locking nut 19 is loosened, the locking screw 18 is released from the locking slot 15, and the locking block 16 is pulled to slide in the direction away from the mold 12. The locking screw 18 at the top of the locking block 16 slides in the locking slot 15, and the guide slider 24 and the cylindrical shell 25 at the bottom of the locking block 16 slide in the left guide slot 22 and the right guide slot 23 respectively. At this time, the four blocks 26 are in an extended state and are synchronously against the inner wall of the right guide slot 23, so that the cylindrical shell 25 can be easily moved. When the cylindrical shell 25 slides in the right guide slot 23, it cannot rotate by itself. The locking block 16 is pulled and the locking block 16 can only slide in a vertical state, which facilitates the locking screw 18 to slide out of the locking slot 15. Then, after the four blocks 26 are contracted, the cylindrical shell 25 can rotate by itself in the right guide slot 23. After the locking block 16 is flipped 90° in the direction away from the cylinder 11 with the cylindrical shell 25 and the guide slider 24 as the center, the four blocks 26 resume the extended state, and the opening 13 is opened. Then, the locking block 16 is pushed to slide in the flip groove 14 in the direction close to the cylinder 11, and is covered on the left guide slot 22 and the right guide slot 23. In this way, when the mold 12 is installed, sand particles can be prevented from falling into the left guide slot 22 and the right guide slot 23 as much as possible. After the mold 12 is installed in the pliers head 10 from the opening 13 along the limiting slide groove, the locking block 16 is pulled to slide in the flip groove 14 in the direction away from the cylinder 11, the four clamping blocks 26 are contracted, and the locking block 16 is flipped up. After the locking block 16 is flipped 90° in the direction close to the cylinder 11 with the cylindrical shell 25 and the guide slider 24 as the center, the locking screw 18 slides into the locking groove 15, the four clamping blocks 26 resume the extended state, and push the locking block 16, so that the locking block 16 is against the mold 12, and the locking nut 19 is re-locked on the locking screw 18, and the locking screw 18 is fastened to the locking groove 15.

[0044] When working in a narrow space or climbing, the locking block 16 is flipped 180° away from the cylinder 11 with the cylindrical shell 25 and the guide slider 24 as the center, and the four clamping blocks 26 resume the extended state. After the original mold is taken out from the opening 13, the locking block 16 is lifted to expose the flip groove 14. In this way, the new mold can be installed from the end of the pliers head 10 close to the flip groove 14, so that the pliers head 10 has two adjacent installation ports, the opening 13 and the flip groove 14, and there is no need to adjust the opening 13 to a position close to the operator, so that the pliers head 10 can more adaptably complete the installation of the mold 12.

[0045] In this embodiment, the central fixed shaft 27 extends into the cylindrical shell 25 from the end away from the locking block 16 and is connected to the side fixed seat 31. The side fixed seat 31 is fixedly installed on the inner wall of the cylindrical shell 25. Four side slide grooves 28 are distributed in a circular array on the central fixed shaft 27. The side slider 29 is slidably connected in the side slide groove 28. One end of the flip rod 30 is rotatably installed on the side slider 29, and the other end of the flip rod 30 is rotatably installed on the clamping block 26. The inner thread sleeve 32 is sleeved on the central fixed shaft 27. The inner thread sleeve 32 is connected to each side slider 29 through a side mounting frame 33. The side mounting frame 33 is sleeved on the central fixed shaft 27. The outer thread sleeve 34 is screwed on the inner thread sleeve 32. The outer thread sleeve 34 is sleeved on the central fixed shaft 27 away from the end of the inner thread sleeve 32 and extends out of the side end of the pliers head 10.

[0046] The working principle and beneficial effects of the above technical solution are:

[0047] The outer screw sleeve 34 is rotated, and after the outer screw sleeve 34 rotates on the central fixed shaft 27, the inner screw sleeve 32 engaged with the outer screw sleeve 34 is driven to slide along the central fixed shaft 27, and the inner screw sleeve 32 drives the side slide block 29 to slide in the side slide groove 28 in the direction away from the side fixed seat 31 through the side mounting frame 33. After the four side slide blocks 29 slide synchronously, the flip rod 30 connected thereto and the block 26 installed on the flip rod 30 away from the end of the side slide block 29 move. After the four blocks 26 shrink on the cylindrical shell 25, the four blocks 26 are released from the inner wall of the right guide slot 23. At this time, the cylindrical shell 25 can rotate freely in the right guide slot 23, thereby making the locking block 16 connected to the cylindrical shell 25 can rotate freely in the flip slot 14, and when the four blocks 26 are restored to be against the inner wall of the right guide slot 23, the cylindrical shell 25 can only slide in the right guide slot 23 again.

[0048] Furthermore, the guide sliding block 24 is a round block structure and can slide and rotate freely in the left guide sliding groove 22 .

[0049] In this embodiment, an auxiliary rotating rod 35 is installed at the end of the outer screw sleeve 34 away from the inner screw sleeve 32 , and an auxiliary rotating block 36 is installed at the end of the central fixed shaft 27 away from the side fixed seat 31 .

[0050] The beneficial effects of the above technical solution are:

[0051] The function of the auxiliary rotating rod 35 is to facilitate the rotation of the outer screw sleeve 34, thereby facilitating the telescopic action of the four clamping blocks 26, and the function of the auxiliary rotating block 36 is to facilitate the rotation of the central fixed shaft 27, thereby facilitating the rotation of the cylindrical shell 25 connected to the central fixed shaft 37 through the side fixing seat 31 and the locking block 16 connected to the cylindrical shell 25.

[0052] In this embodiment, a return spring 37 is connected between the side fixing seat 31 and the clamping block 26 .

[0053] The working principle and beneficial effects of the above technical solution are:

[0054] In the initial state of the return spring 37, the block 26 is in a contracted state, and when the return spring 37 is stretched, the block 26 is in an extended state. When the return spring 37 returns to the initial state, it is beneficial to the contraction of the block 26.

[0055] In this embodiment, a return spring 2 38 is provided near the end of the inner screw sleeve 32 of the outer screw sleeve 34 , one end of the return spring 2 38 is connected to the side mounting frame 33 , and the other end of the return spring 2 38 is abutted against an outer limit ring 1 39 , and the outer limit ring 1 39 is integrally formed on the outer screw sleeve 34 .

[0056] The working principle and beneficial effects of the above technical solution are:

[0057] In the initial state of the return spring 2 38 , the block 26 is in an extended state, and when the return spring 1 37 is stretched, the block 26 is in a contracted state. When the return spring 2 38 returns to its initial state, it is beneficial for the block 26 to extend. The elastic force of the return spring 2 38 is greater than that of the return spring 1 37 .

[0058] In this embodiment, the end of the central fixed shaft 27 away from the side fixed seat 31 is integrally formed with an outer limiting ring 2 40 , and the end of the outer screw sleeve 34 away from the inner screw sleeve 32 is disposed on the outer limiting ring 2 40 .

[0059] The working principle and beneficial effects of the above technical solution are:

[0060] The provision of the second outer limiting ring 40 facilitates the limiting of the outer screw sleeve 34 on the central fixed shaft 27 .

[0061] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A hydraulic casing power tong for oil energy development, comprising a tong head (10) and a cylinder (11), wherein the cylinder (11) is fixedly mounted on the tong head (10), the tong head (10) is arranged in an open-end manner away from the cylinder (11), and a mold (12) is installed in the tong head (10) from the open end (13), characterized in that: A turning groove (14) is provided at the bottom of the opening (13), a locking groove (15) is provided at the top of the opening (13), the bottom end of a locking block (16) is installed in the turning groove (14) through a lower turning assembly (17), a locking screw (18) is installed at the top of the locking block (16), when the locking block (16) turns up, the locking screw (18) slides into the locking groove (15), a locking nut (19) is installed on the locking screw (18), and the locking block (16) is abutted against the mold (12).

2. The hydraulic casing power tongs for oil energy development according to claim 1 are characterized in that: The connecting rod (20) is installed on the end of the oil cylinder (11) away from the clamp head (10), and the pressure rod (21) is movably connected to the oil cylinder (11) and is arranged close to the connecting rod (14).

3. The hydraulic casing power tongs for oil energy development according to claim 1 are characterized in that: The bottom and top of the opening (13) are also provided with limiting slide grooves for facilitating the sliding of the mold (12); the width of the turnover groove (14) is greater than the limiting slide groove, the limiting slide groove is arranged to avoid the turnover groove (14); the width of the locking groove (15) is less than the limiting slide groove, and the locking groove (15) is connected to the limiting slide groove.

4. The hydraulic casing power tongs for oil energy development according to claim 1 are characterized in that: The lower flip assembly (17) comprises: a left guide slot (22) and a right guide slot (23) which are oppositely arranged on the inner wall of the flip slot (14); the right guide slot (23) is connected to the side end of the clamp head (10); when the locking block (16) flips up to a horizontal state, it is covered on the left guide slot (22) and the right guide slot (23); a guide slider (24) is slidably connected in the left guide slot (22); the guide slider (24) is fixedly connected to the locking block (16); a cylindrical shell (25) is slidably connected in the right guide slot (23); the cylindrical shell (25) is fixedly connected to the locking block (16); four retractable blocks (26) are distributed in a circular array on the side end of the cylindrical shell (25); when the four blocks (26) are extended, they are synchronously abutted against the inner wall of the right guide slot (23) to limit the rotation of the cylindrical shell (25).

5. The hydraulic casing power tongs for oil energy development according to claim 4 are characterized in that: The central fixed shaft (27) extends from the end of the cylindrical shell (25) away from the locking block (16) into the cylindrical shell and is connected to the side fixed seat (31). The side fixed seat (31) is fixedly installed on the inner wall of the cylindrical shell (25). Four side slide grooves (28) are distributed in a circular array on the central fixed shaft (27). The side slider (29) is slidably connected in the side slide groove (28). One end of the flip rod (30) is rotatably installed on the side slider (29). The other end of the flip rod (30) is rotatably installed on the side slider (29). One end is rotatably mounted on the clamping block (26); the inner screw sleeve (32) is sleeved on the central fixed shaft (27); the inner screw sleeve (32) is connected to each side slide block (29) through a side mounting frame (33); the side mounting frame (33) is sleeved on the central fixed shaft (27); the outer screw sleeve (34) is screwed on the inner screw sleeve (32); the end of the outer screw sleeve (34) away from the inner screw sleeve (32) is sleeved on the central fixed shaft (27) and extends out of the side end of the clamp head (10).

6. The hydraulic casing power tongs for oil energy development according to claim 5, characterized in that: An auxiliary rotating rod (35) is installed at the end of the outer screw sleeve (34) away from the inner screw sleeve (32), and an auxiliary rotating block (36) is installed at the end of the central fixed shaft (27) away from the side fixed seat (31).

7. The hydraulic casing power tongs for oil energy development according to claim 5, characterized in that: A return spring 1 (37) is connected between the side fixing seat (31) and the clamping block (26).

8. The hydraulic casing power tongs for oil energy development according to claim 5, characterized in that: The outer screw sleeve (34) is provided with a second return spring (38) near the end of the inner screw sleeve (32), one end of the second return spring (38) is connected to the side mounting frame (33), and the other end of the second return spring (38) is abutted against an outer limit ring (39), and the outer limit ring (39) is integrally formed on the outer screw sleeve (34).

9. The hydraulic casing power tongs for oil energy development according to claim 5 are characterized in that The end of the central fixed shaft (27) away from the side fixed seat (31) is integrally formed with an outer limiting ring 2 (40). The end of the outer screw sleeve (34) away from the inner screw sleeve (32) is disposed on the second outer limiting ring (40).

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