A device for cutting the inner wall of a pipe

Abstract

The utility model belongs to pipeline processing technical field, specifically disclose a device for pipeline inner wall cutting, include: base, clamping assembly, moving assembly, cutting assembly and conversion sleeve subassembly, clamping assembly and moving assembly install on the base, cutting assembly is connected with one end of moving assembly, conversion sleeve subassembly includes transmission inner spline shaft, transmission outer spline shaft, sleeve body, transmission nut shaft and handle, sleeve body sets up between transmission inner spline shaft and transmission outer spline shaft, handle is connected with sleeve body through transmission nut shaft, pulls handle, and sleeve body can selectably connect through transmission outer spline shaft with moving assembly, or connect through transmission inner spline shaft with clamping assembly, rotates handle, drives cutting assembly to move or drives clamping assembly to be close to / away from pipeline inner wall. The device avoids the damage to the outer surface of the pipeline during clamping, simplifies the device structure and reduces the maintenance difficulty.

Description

Technical Field

[0001] This utility model belongs to the field of pipe processing technology, specifically relating to a device for cutting the inner wall of a pipe. Background Technology

[0002] Pipelines, used for transporting gases, liquids, or fluids containing solid particles, are widely used in water supply, drainage, heating, gas supply, long-distance transport of oil and natural gas, agricultural irrigation, and water conservancy projects. Most pipelines are manufactured to a predetermined length, but need to be cut into sections or connected to the required length according to actual standards for field use.

[0003] Existing pipe cutting methods involve placing the pipe on a fixed processing platform, marking the required length on the outside or inside of the pipe, and then cutting along the lines using a cutting tool. For example, a pipe cutting machine disclosed in patent publication number CN216828876U, which facilitates clamping and positioning of the workpiece, places the pipe body to be cut on a fixed clamp, with the left end pressed against a vertical block. After turning on the drive motor, the drive shaft rotates the lead screw, and the moving block threaded onto it moves downwards to press and fix the pipe body through a first connecting rod and a slot connection and limit. Depending on the cutting position, a cylinder is activated to move the moving shell, which in turn moves the cutting blade horizontally. After turning on the cutting motor, the cutting blade rotates and is lowered by a hydraulic telescopic column to perform the cutting operation. However, this cutting machine has the following problems: 1. External surface damage: The clamping mechanism is located on the outside of the pipe, which inevitably damages the outer surface of the pipe and affects its appearance, such as indoor decorative pipes; 2. Complex structure: The clamping mechanism and the cutting mechanism are driven by two different drive sources, which makes the structure of the equipment complex, increases the probability of failure, and also increases the difficulty of equipment maintenance. Utility Model Content

[0004] The purpose of this invention is to provide a device for cutting the inner wall of a pipe, avoiding damage to the outer surface of the pipe during clamping, while simplifying the device structure and reducing maintenance difficulty.

[0005] The purpose of this utility model is achieved through the following technical solution: a device for cutting the inner wall of a pipe, comprising: a base, a clamping assembly, a moving assembly, a cutting assembly, and a conversion sleeve assembly; the clamping assembly and the moving assembly are mounted on the base, and one end of the cutting assembly is connected to the moving assembly; the conversion sleeve assembly includes a transmission inner spline shaft, a transmission outer spline shaft, a sleeve body, a transmission nut shaft, and a handle, with the sleeve body positioned between the transmission inner spline shaft and the transmission outer spline shaft; the handle is connected to the sleeve body via the transmission nut shaft; pulling the handle allows the sleeve body to selectively connect to the moving assembly via the transmission outer spline shaft, or to the clamping assembly via the transmission inner spline shaft; rotating the handle drives the cutting assembly to move or drives the clamping assembly to move closer to / away from the inner wall of the pipe.

[0006] Preferably, the clamping assembly includes a transmission disk and a plurality of T-shaped claws. The T-shaped claws are spaced apart circumferentially along the transmission disk. Each T-shaped claw includes an abutment block, a sliding screw, and a roller. The surface of the transmission disk is provided with a corresponding arc-shaped groove for each T-shaped claw to move. The surface of the base is provided with a groove that mates with the arc-shaped groove. The sliding screw passes through the arc-shaped groove and the groove, with one end connected to the abutment block and the other end connected to the roller. The abutment block is located on the outer side of the base surface, and the roller is located on the inner side of the transmission disk.

[0007] Preferably, the clamping assembly further includes a brake rod, a threaded hole is provided on the outer circumference of the base, the brake rod is threadedly engaged with the threaded hole, and the transmission disc is provided with a locking groove along the circumference that engages with the brake rod.

[0008] Preferably, the moving component includes a nut and a lead screw, the nut being mounted on the base and threadedly engaged with the lead screw.

[0009] Preferably, the cutting assembly includes a laser head holder and a laser head, with the laser head holder mounted on the movable assembly and the laser head mounted on the laser head holder.

[0010] Preferably, the cutting assembly further includes a laser cable, the lead screw has a hollow groove along its axis, the laser cable is placed in the hollow groove, one end of the laser cable is connected to a power source, and the other end is connected to a laser head.

[0011] Preferably, the base is also provided with an indexing plate, and a synchronous indexing pin is provided between the sleeve body and the transmission nut shaft. The conversion sleeve assembly also includes a lead screw brake pad and a brake pad spring that cooperates with the lead screw brake pad.

[0012] Due to the adoption of the above technical solution, this utility model has the following advantages: This utility model's clamping assembly acts on the inner wall of the pipe, avoiding damage to the outer surface of the pipe during clamping and affecting its appearance. It is equipped with a conversion sleeve assembly, and the sleeve body can be selectively connected to the moving assembly or the clamping assembly via a handle. This allows for selective driving of the clamping assembly to clamp the pipe, or driving the moving assembly to move to a preset position, and the cutting assembly to cut the pipe. The device structure is simplified, reducing maintenance difficulty. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 This is a schematic diagram of the structure of a device for cutting the inner wall of a pipe according to the present invention; Figure 2 This is an enlarged view of point A; Figure 3 This is a schematic diagram of the sleeve body. Figure 4 This is a schematic diagram of the clamping assembly. Figure 5 This is an enlarged view of point B; Figure 6 This is a schematic diagram of the cutting component. Figure 7 This is a schematic diagram of the combination of the device and piping.

[0015] Figure label: 1-Base, 11-Outer shell base, 111-Slot, 12-Outer shell cover, 121-Second bolt, 13-First bearing, 14-Bearing cover, 141-First bolt, 15-Indexing plate, 16-Synchronous indexing pin, 17-Mounting cavity; 2-Clamping assembly, 21-Transmission disc, 211-Arc groove, 212-Locking groove, 22-T-shaped claw, 221-Abutting block, 222-Sliding screw, 223-Roller, 23-Third bearing, 24-Transmission disc end cover, 241-Third bolt, 25-Brake lever, 251-Ball head, 252-Rod body, 253-Abutting head; 3-Moving component, 31-Nut, 32-Lead screw, 321-Hollow groove; 4-Cutting assembly, 41-Laser head holder, 411-Screw, 412-Mounting base, 413-Third internal thread, 414-Sixth bolt, 42-Laser head, 43-Laser cable; 5-Converter sleeve assembly; 51-Drive internal spline shaft; 511-Second bearing; 512-Fourth bolt; 52-Drive external spline shaft; 521-Fifth bolt; 53-Sleeve body; 531-First internal spline; 532-Second external spline; 533-First internal thread; 534-Groove frame; 535-Slide groove; 54-Drive nut shaft; 541-Key; 55-Handle; 56-Screw brake pad; 57-Brake pad spring; 6-Pipe. Detailed Implementation

[0016] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0017] Please see Figure 1 , Figure 2 , Figure 3 and Figure 7 A device for cutting the inner wall of a pipe includes: a base 1, a clamping assembly 2, a moving assembly 3, a cutting assembly 4, and a conversion sleeve assembly 5; the clamping assembly 2 and the moving assembly 3 are mounted on the base 1, the cutting assembly 4 is connected to one end of the moving assembly 3, the conversion sleeve assembly 5 includes a drive inner spline shaft 51, a drive outer spline shaft 52, a sleeve body 53, a drive nut shaft 54, and a handle 55, the sleeve body 53 is disposed between the drive inner spline shaft 51 and the drive outer spline shaft 52; the handle 55 is connected to the sleeve body 53 through the drive nut shaft 54, pulling the handle 55 allows the sleeve body 53 to be selectively connected to the moving assembly 3 through the drive outer spline shaft 52, or to the clamping assembly 2 through the drive inner spline shaft 51; rotating the handle 55 drives the cutting assembly 4 to move or drives the clamping assembly 2 to move closer to / away from the inner wall of the pipe 6. Specifically, the base 1 includes a housing base 11 and a housing cover 12. The housing cover 12 is installed on one side of the housing base 11 by a second bolt 121. The housing cover 12 seals the housing base 11 and forms a mounting cavity 17 with the housing base 11. The clamping assembly 2, the moving assembly 3, and the conversion sleeve assembly 5 are disposed in the mounting cavity 17. One end of the sleeve body 53 has a first internal spline 531 on its inner wall, and one end of the transmission external spline shaft 52 has a first external spline that mates with the first internal spline 531. The other end of the sleeve body 53 has a second external spline 532 on its outer side, and one end of the transmission internal spline shaft 51 has a second internal spline that mates with the second external spline 532 on its inner wall. The sleeve body 53 has a first internal thread 533 on its inner wall at one end of the second external spline 532, and one end of the transmission nut shaft 54 ​​has a first external thread that mates with the first internal thread 533 on its outer side. The transmission nut shaft 54 ​​is connected to the handle 55 by a key 541. The end of the transmission inner spline shaft 51 closest to the second inner spline is connected to the outer casing 12 via the second bearing 511. The end of the transmission inner spline shaft 51 furthest from the second inner spline is connected to the clamping assembly 2 via the fourth bolt 512. The moving assembly 3 is connected to the transmission outer spline shaft 52 via the fifth bolt 521.

[0018] This utility model discloses a device for cutting the inner wall of a pipe. In use, the pipe 6 is placed on several conventional support frames to support it, facilitating the placement of the pipe 6 after cutting. The device is inserted into one end of the pipe 6. Pulling the handle 55 backward engages the sleeve body 53 with the inner spline shaft 51. Rotating the handle 55 causes the clamping assembly 2 to rotate synchronously with the inner spline shaft 51, driving the clamping assembly 2 to move towards the inner wall of the pipe 6 until it is in close contact with the inner wall. Then, pushing the handle 55 forward disengages the sleeve body 53 from the inner spline shaft 51, switching it to connect with the outer spline shaft 52. Rotating the handle 55 causes the outer spline shaft 52 to rotate synchronously with the moving assembly 3, driving the cutting assembly 4 to move forward or backward along the axis of the pipe 6. Once the predetermined position is reached, the cutting assembly 4 can be activated for cutting. The movement position of the cutting component 4 can be calculated using existing technology, such as the rotary encoder used in authorization announcement number CN213702435U, which calculates the number of rotations. A rotary encoder is installed on the handle 55, recording the number of rotations of the handle 55. The lead screw lead multiplied by the number of rotations yields the predetermined forward extension distance. After cutting, the sleeve body 53 is retracted to engage with the transmission inner spline shaft 51. The handle 55 is rotated in the opposite direction, driving the clamping component 2 away from the inner wall of the pipe 6, separating the device from the pipe 6, and the device can be removed. The clamping component 2 of this device acts on the inner wall of the pipe 6, avoiding damage to the outer surface of the pipe 6 during clamping and affecting its appearance. A conversion sleeve component 5 is provided, which can be selectively connected to the moving component 3 or the clamping component 2, thereby selectively driving the clamping component 2 to clamp the pipe 6, or driving the moving component 3 to move to a preset position. The device structure is simplified, reducing maintenance difficulty.

[0019] Further, please refer to Figure 4The clamping assembly 2 includes a transmission disk 21 and several T-shaped claws 22. The T-shaped claws 22 are spaced apart around the circumference of the transmission disk 21. Each T-shaped claw 22 includes an abutment block 221, a sliding screw 222, and a roller 223. The surface of the transmission disk 21 is provided with a corresponding arc-shaped groove 211 for each T-shaped claw 22 to move. The surface of the base 1 is provided with a groove 111 that cooperates with the arc-shaped groove 211. The sliding screw 222 passes through the arc-shaped groove 211 and the groove 111, with one end connected to the abutment block 221 and the other end connected to the roller 223. The abutment block 221 is located on the outer side of the surface of the base 1, and the roller 223 is located in the arc-shaped groove 211. Specifically, the transmission disk 21 is disposed in the mounting cavity 17. The base 1 also includes a first bearing 13 and a bearing cover 14. The inner circumference of the first bearing 13 is connected to the moving component 3, and the outer circumference is connected to the outer housing base 11. The bearing cover 14 is disposed on the outer side of the first bearing 13. The outer housing base 11 and the bearing cover 14 are connected by a first bolt 141. Preferably, three grooves 111 are arranged radially along the outer housing base 11. The clamping component 2 also includes a third bearing 23 and a transmission disk end cover 24. The inner circumference of the third bearing 23 is connected to the moving component 3, and the outer circumference is connected to the transmission disk 21. The transmission disk 21 and the transmission disk end cover 24 are connected by a third bolt 241. The transmission disk 21 and the transmission inner spline shaft 51 are connected by a fourth bolt 512. One end of the sliding screw 222 is connected to the abutment block 221 by a threaded connection, and the other end is connected to the roller 223 by welding. In use, the transmission disc 21 cooperates with the inner spline shaft 51 of the transmission. When the handle 55 is turned, the T-shaped pawl 22 moves synchronously along the groove 111 and the arc groove 211, thereby moving closer to or away from the inner wall of the pipe 6.

[0020] Further, please refer to Figure 1 , Figure 4 and Figure 5 The clamping assembly 2 also includes a brake lever 25. A threaded hole is provided on the outer circumference of the base 1, and the brake lever 25 is threadedly engaged with the threaded hole. The transmission disc 21 is provided with a locking groove 212 along the circumference to engage with the brake lever 25. Specifically, the brake lever 25 includes a ball head 251, a rod body 252, and an abutment head 253. A threaded hole is provided on the outer circumference of the outer casing base 11. One end of the rod body 252 near the abutment head 253 is provided with a second external thread, and the other end is provided with a ball head 251. The brake lever 25 is threadedly engaged with the threaded hole. By holding the ball head 251 and rotating the ball head 251, the rod body 252 is screwed into or out of the threaded hole, thereby moving the abutment head 253 away from or towards the locking groove 212. When the abutment head 253 extends into the locking groove 212, the brake lever 25 is in close contact with the inner wall of the locking groove 212, locking the transmission disc 21 by friction and preventing it from rotating. Preferably, the contact head 253 is wedge-shaped, and correspondingly, the locking groove 212 has a wedge-shaped cross-section to increase friction.

[0021] Further, please refer to Figure 1 and Figure 2 The moving component 3 includes a nut 31 and a lead screw 32. The nut 31 is mounted on the base 1 and is threadedly engaged with the lead screw 32. Specifically, the moving component 3 is sleeved around the center of the shaft of the base 1, the cutting component 4 is mounted at the end away from the base 1, the inner circumferences of the first bearing 13 and the third bearing 23 respectively abut against the nut 31, the nut 31 is connected to the transmission external spline shaft 52 by the fifth bolt 521, and the conversion sleeve component 5 is sleeved on the outside of the lead screw 32. The sleeve body 53 engages with the transmission external spline shaft 52, and when the handle 55 is turned, the transmission external spline shaft 52 and the nut 31 rotate synchronously, and the nut 31 engages with the lead screw 32, thereby causing the lead screw 32 to move forward or backward along the axis of the pipe 6.

[0022] Further, please refer to Figure 1 and Figure 6 The cutting assembly 4 includes a laser head mounting base 41 and a laser head 42. The laser head mounting base 41 is mounted on the moving assembly 3, and the laser head 42 is mounted on the laser head mounting base 41. Specifically, the laser head mounting base 41 includes a screw 411 and a mounting seat 412. One end of the screw 411 is connected to the mounting seat 412 by welding, and the inner wall of the other end is provided with a third internal thread 413 that mates with the thread of the lead screw 32. The laser head 42 is connected to the mounting seat 412 by a sixth bolt 414.

[0023] Further, please refer to Figure 1 The cutting assembly 4 also includes a laser cable 43. A hollow groove 321 is provided along the axis of the lead screw 32, and the laser cable 43 is placed in the hollow groove 321. One end of the laser cable 43 is connected to the power supply, and the other end is connected to the laser head. The laser cable 43 rotates in the hollow groove 321 as the laser head 42 rotates. This structure facilitates the placement of the laser cable 43 within the device and prevents interference with other components. By adjusting the output current of the power supply, the laser emitted by the laser head 42 can cut the pipe 6 or scribble lines on the pipe 6.

[0024] Further, please refer to Figure 1 and Figure 2The base 1 is also provided with an indexing plate 15, and a synchronous indexing pin 16 is provided between the sleeve body 53 and the transmission nut shaft 54. The conversion sleeve assembly 5 also includes a lead screw brake pad 56 and a brake pad spring 57 that cooperates with the lead screw brake pad 56. Specifically, the sleeve body 53 is provided with a groove frame 534, the lead screw brake pad 56 is disposed in the groove frame 534, one end of the brake pad spring 57 abuts against the inner wall of the sleeve body 53, and the other end abuts against the lower surface of the lead screw brake pad 56. The sleeve body 53 is provided with a groove 535 for the synchronous indexing needle 16 to move. The indexing plate 15 is located on the outside of the outer cover 12. When the synchronous indexing needle 16 is ejected, one end of the synchronous indexing needle 16 presses against the upper surface of the lead screw brake 56. There will be no relative movement between the transmission external spline shaft 52, the nut 31, and the lead screw 32, thus making the lead screw 32, the nut 31, and the handle 55 a single unit. The lead screw 32 can only rotate with the handle 55. At this time, the synchronous indexing needle 16 is exactly in contact with the indexing plate 15. Rotating the handle 55 will indicate the rotation to the specified angle. Using this structure, the pipe 6 can be partially cut or scribed at an angle. When the synchronous indexing needle 16 is withdrawn, the synchronous indexing needle 16 disengages from the upper surface of the lead screw brake 56, and the lead screw brake 56 returns to its original position under the action of the brake spring 57. The synchronous relationship between the lead screw 32, the nut 31, and the handle 55 is released.

[0025] In use, first move the device to one end of pipe 6 so that the T-shaped chuck 22 is on the inner wall of pipe 6. Pull the handle 55 backward to engage the sleeve body 53 with the inner spline shaft 51 of the transmission. Rotate the handle 55 to move the T-shaped chuck 22 in the groove 111 and the arc groove 211, so that the contact block 221 is in close contact with the inner wall of pipe 6. Rotate the brake lever 25, and the brake lever 25 is in close contact with the inner wall of the locking groove 212, so that the transmission disc 21 cannot rotate.

[0026] Then pull the handle 55 forward to make the sleeve body 53 engage with the transmission external spline shaft 52. Turn the handle 55, and the transmission external spline shaft 52 and nut 31 rotate synchronously. The nut 31 engages with the lead screw 32, so that the lead screw moves forward along the axis of the pipe 6. The lead screw is equipped with a laser head 42. After reaching the predetermined position, the laser head 42 can be turned on to scribing or cutting.

[0027] Optionally, pulling handle 55 forward causes sleeve body 53 to engage with transmission external spline shaft 52, pushing out synchronous indexing pointer 16. One end of pointer 16 presses against lead screw brake 56, thus making lead screw 32, nut 31, and handle 55 a single unit. At this time, synchronous indexing pointer 16 is in contact with indexing plate 15. By rotating handle 55 to a specified angle, the laser head can be activated to scribing lines at a preset angle. After scribing is completed, synchronous indexing pointer 16 is deactivated, the synchronization relationship between lead screw 32, nut 31, and handle 55 is released, and lead screw brake 56 returns to its original position under the action of brake spring 57.

[0028] Finally, after marking the lines, pull the handle 55 back to engage with the inner spline shaft 51 of the transmission, disengage the brake lever 25, rotate the handle 55, and the T-shaped pawl 22 will disengage from the inner wall of the pipe 6, and the device can be removed.

[0029] The clamping component 2 of this invention acts on the inner wall of the pipe 6, avoiding damage to the outer surface of the pipe 6 during clamping and affecting its appearance. A conversion sleeve component 5 is provided, with the sleeve body 53 selectively connected to either the moving component 3 or the clamping component 2. This allows for selective driving of the clamping component 2 to clamp the pipe 6, or driving the moving component 3 to move the cutting component 4 to a preset position. This simplifies the device structure and reduces maintenance difficulty. The lead screw 32 has a hollow groove 321 along its axis, facilitating the placement of the laser cable 43 within the device without interference with other components. By incorporating an indexing plate 15, a synchronous indexing pin 16, a lead screw brake 56, and a brake spring 57, the pipe 6 can be locally cut or scribed at an angle.

[0030] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific implementation method of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the scope of the spirit of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for cutting the inner wall of a pipe, characterized in that, include: The base (1), clamping assembly (2), moving assembly (3), cutting assembly (4), and conversion sleeve assembly (5); the clamping assembly (2) and moving assembly (3) are mounted on the base (1), and the cutting assembly (4) is connected to one end of the moving assembly (3); the conversion sleeve assembly (5) includes a transmission inner spline shaft (51), a transmission outer spline shaft (52), a sleeve body (53), a transmission nut shaft (54), and a handle (55), the sleeve body (53) being disposed on the transmission inner spline shaft. Between the key shaft (51) and the transmission external spline shaft (52); the handle (55) is connected to the sleeve body (53) via the transmission nut shaft (54); by pulling the handle (55), the sleeve body (53) can be selectively connected to the moving component (3) via the transmission external spline shaft (52), or connected to the clamping component (2) via the transmission internal spline shaft (51); by rotating the handle (55), the cutting component (4) is moved or the clamping component (2) is moved closer to / away from the inner wall of the pipe (6).

2. The device for cutting the inner wall of a pipe according to claim 1, characterized in that, The clamping assembly (2) includes a transmission disk (21) and several T-shaped claws (22). The T-shaped claws (22) are spaced apart around the circumference of the transmission disk (21). Each T-shaped claw (22) includes an abutment block (221), a sliding screw (222), and a roller (223). The surface of the transmission disk (21) is provided with a corresponding arc groove (211) for each T-shaped claw (22) to move. The surface of the base (1) is provided with a groove (111) that cooperates with the arc groove (211). The sliding screw (222) passes through the arc groove (211) and the groove (111), with one end connected to the abutment block (221) and the other end connected to the roller (223). The abutment block (221) is located on the outer side of the surface of the base (1), and the roller (223) is located on the inner side of the transmission disk (21).

3. The apparatus for cutting the inner wall of a pipe according to claim 1 or 2, characterized in that, The clamping assembly (2) also includes a brake lever (25). A threaded hole is provided on the outer circumference of the base (1). The brake lever (25) is threadedly engaged with the threaded hole. The transmission disc (21) is provided with a locking groove (212) along the circumference that engages with the brake lever (25).

4. The apparatus for cutting the inner wall of a pipe according to claim 1 or 2, characterized in that, The moving component (3) includes a nut (31) and a lead screw (32). The nut (31) is mounted on the base (1) and the nut (31) is threadedly engaged with the lead screw (32).

5. The apparatus for cutting the inner wall of a pipe according to claim 3, characterized in that, The moving component (3) includes a nut (31) and a lead screw (32). The nut (31) is mounted on the base (1) and the nut (31) is threadedly engaged with the lead screw (32).

6. The apparatus for cutting the inner wall of a pipe according to claim 1, 2, or 5, characterized in that, The cutting assembly (4) includes a laser head holder (41) and a laser head (42). The laser head holder (41) is mounted on the moving assembly (3), and the laser head (42) is mounted on the laser head holder (41).

7. The apparatus for cutting the inner wall of a pipe according to claim 6, characterized in that, The cutting assembly (4) also includes a laser cable (43). The lead screw (32) has a hollow groove (321) along its axis. The laser cable (43) is placed in the hollow groove (321). One end of the laser cable (43) is connected to the power supply, and the other end is connected to the laser head (42).

8. The apparatus for cutting the inner wall of a pipe according to claim 1, 2, 5 or 7, characterized in that, The base (1) is also provided with an indexing plate (15), and a synchronous indexing pin (16) is provided between the sleeve body (53) and the transmission nut shaft (54). The conversion sleeve assembly (5) also includes a lead screw brake pad (56) and a brake pad spring (57) that cooperates with the lead screw brake pad (56).

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