A centralizer for a screw drill

Abstract

The application discloses a centralizer for a screw drill, and belongs to the technical field of oil exploitation.The technical scheme is as follows: the centralizer for the screw drill comprises a centralizer body, the centralizer body is fixedly connected with a transmission shaft outer shell, and further comprises a centralizing assembly.The centralizing assembly comprises centralizing plates, centralizing springs and support frames;the centralizing plates are provided in plurality;the plurality of centralizing plates are evenly arranged in a circumferential direction along the outer wall of the centralizer body;one end of the centralizing spring is connected with one end of the centralizing plate close to the centralizer body;the other end of the centralizing spring is connected with the outer wall of the centralizer body close to one side of the centralizing plate;the support frames are correspondingly provided in plurality;two support frames and one centralizing plate form a group;the support frames in the same group are respectively located at the two ends of the centralizing plate;the support frames are fixedly connected with the centralizer body;and the support frames are relatively detachably connected with the centralizing plates, so that the centralizer can adjust the axis of the transmission shaft according to the deviation.

Description

Technical Field

[0001] This invention relates to the field of oil extraction, and in particular to a centralizer for screw drill bits. Background Technology

[0002] Currently, petroleum is a complex mixture consisting of gaseous, liquid, and solid hydrocarbon compounds that exist in nature, as well as a small amount of impurities; petroleum extraction refers to the act of digging and extracting petroleum from places where petroleum is stored.

[0003] In oil extraction, screw drills are used to drill to target locations. A screw drill is a volumetric downhole power drill that uses drilling fluid as a power source, converting fluid pressure energy into mechanical energy. The screw drill includes a drive shaft, a drive shaft housing, and a drill bit connected to the drive shaft. Driving the drive shaft rotates the drill bit, which penetrates multiple layers to reach the target layer, forming a stable channel for oil and gas extraction or injection. During drilling, the drill bit may vibrate or deviate due to terrain and other factors, causing friction between the drive shaft housing and the rock formation during rotation. This wear can damage or break the drive shaft, affecting drilling operations. To reduce friction between the drive shaft housing and the rock formation, a spiral stabilizer is typically welded to the outer wall of the drive shaft housing. This reduces the gap between the housing and the formation, and the stabilizer also prevents friction between the housing and the inner wall of the rock formation.

[0004] Because the stabilizer is connected to the outer wall of the drive shaft housing through a welding process, when the axis of the drive shaft housing is offset, the outer wall of the drive shaft housing will continuously rub against the rock formation. This results in a defect that the stabilizer cannot easily adjust the axis of the drive shaft housing according to the offset. When the stabilizer wears unevenly, the straightening effect deteriorates, which may affect the normal progress of drilling operations. Summary of the Invention

[0005] In order to enable the centralizer to adjust the axis of the drive shaft housing according to the offset, the present invention provides a centralizer for screw drills.

[0006] The present invention provides a centralizer for screw drill bits, which adopts the following technical solution:

[0007] A centralizer for a screw drill bit includes a centralizer body fixedly connected to a drive shaft housing, and a centralizer assembly comprising a centralizer plate, a centralizer spring, and support frames. Multiple centralizer plates are evenly arranged circumferentially along the outer wall of the centralizer body. One end of each centralizer spring is connected to the end of a centralizer plate near the centralizer body, and the other end is connected to the outer wall of the centralizer body near the centralizer plate. Multiple support frames are correspondingly arranged, with two support frames and one centralizer plate forming a group. Support frames in the same group are located at both ends of the centralizer plate. The support frames are fixedly connected to the centralizer body and detachably connected to the centralizer plate.

[0008] By adopting the above technical solution, when the straightening plate comes into contact with the rock stratum, the force on the drive shaft housing in all directions can be made more uniform under the action of the straightening spring. This allows the axis of the drive shaft housing to be automatically adjusted when the straightener deviates, reducing wear between the drive shaft housing and the rock stratum. The straightening plate and the support frame are detachably connected, making it easy for workers to load and unload the straightening plate. When the straightening plate is worn to the point of being unusable, it can be quickly replaced, improving the straightening effect.

[0009] Preferably, the body of the straightener has a plurality of straightening grooves corresponding to the position of the straightening plate, the length direction of the straightening grooves is parallel to the length direction of the straightening plate, and the end of the straightening spring away from the straightening plate is connected to the inner wall of the straightening groove.

[0010] By adopting the above technical solution, the straightening groove can provide more space for the compression of the straightening spring, enabling the straightening spring to more stably balance the pressure on the straightening plate and extend the service life of the straightening spring.

[0011] Preferably, the straightening plate is connected to an mounting plate, and two mounting plates and one straightening plate form a group. The two mounting plates in the same group are fixedly connected to both ends of the straightening plate, and the mounting plate is slidably connected to the support frame. The straightening assembly also includes a limiting member for limiting the relative position of the mounting plate and the support frame. The limiting member is connected to the support frame.

[0012] By adopting the above technical solution, the straightening plate is detachably connected to the support frame via the mounting plate, which makes it convenient for staff to remove the mounting plate that needs to be replaced in a timely manner. The limiting component can restrict the relative position of the mounting plate and the support frame, making it difficult for the mounting plate to fall off the support frame, thereby causing the straightening plate to lose its straightening effect.

[0013] Preferably, the limiting member is a limiting bolt, and multiple limiting bolts are provided. The support frame has an installation groove for the mounting plate to slide into. The multiple limiting bolts pass through the end of the support frame that has the installation groove, and the limiting bolts are threadedly connected to the support frame.

[0014] By adopting the above technical solution, the limiting bolt is threadedly connected to the support frame, which can stably limit the mounting plate without affecting the sliding of the mounting plate.

[0015] Preferably, the length direction of the straightening plate is parallel to the length direction of the straightening device body.

[0016] By adopting the above technical solution, the length direction of the straightening plate is parallel to the length direction of the straightener, which can increase the force-bearing area of ​​the straightening plate along the axial direction of the straightener body, disperse the pressure on the straightening plate during the rotation of the drive shaft housing, and extend the service life of the straightening plate.

[0017] Preferably, the straightener body is connected to a lubrication assembly for lubricating the worn areas of the straightener plate.

[0018] By adopting the above technical solution, the lubrication component can reduce the friction between the worn area of ​​the straightening plate and the rock layer, reduce the wear of the straightening plate, extend the service life of the straightening plate, and enhance the effect of the straightening plate and the straightening spring in adjusting the axis of the drive shaft housing.

[0019] Preferably, the lubrication assembly includes a reservoir sleeve and lubrication tubes. The reservoir sleeve, which stores lubricating fluid, is connected to the centralizer body at the end closest to it and furthest from the drill bit. The reservoir sleeve has multiple outlet holes on its bottom surface, and multiple lubrication tubes are correspondingly provided. The multiple lubrication tubes are rotatably connected to the reservoir sleeve. The lubrication tubes are evenly distributed circumferentially along the bottom surface of the reservoir sleeve and are located above the support frame. The reservoir sleeve has drip holes for lubricating fluid to flow out.

[0020] By adopting the above technical solution, the liquid storage sleeve can store a certain amount of lubricating fluid. The lubricating fluid flows through the lubrication pipe to the contact point between the straightening plate and the inner wall of the rock stratum, which can provide lubrication for the straightening plate and prevent it from being damaged by long-term friction with the rock stratum, thereby affecting the straightening effect.

[0021] Preferably, a conversion head is fixedly connected to the end of the lubrication tube away from the dripping hole. The conversion head is located inside the liquid outlet and is rotatably connected to the bottom surface of the liquid storage sleeve. The longitudinal section of the conversion head is circular, and a liquid receiving hole is opened on the side of the conversion head away from the dripping hole.

[0022] By adopting the above technical solution, when the lubrication pipe is in a horizontal position, the converter can block the liquid storage sleeve, preventing the lubricant in the liquid storage sleeve from flowing into the lubrication pipe. As a result, the lubricant in the lubrication pipe is thrown to the outside during the rotation of the lubrication pipe driven by the drive shaft housing, causing unnecessary waste. When the lubrication pipe rotates, the liquid receiving hole and the liquid outlet hole are connected, connecting the liquid storage sleeve and the lubrication pipe, and allowing the lubricant to flow to the outside through the drip hole. This achieves the effect of controlling the flow of lubricant by controlling the angle of the lubrication pipe.

[0023] Preferably, the lubrication assembly further includes a moving rod, a transition rod, and an adjusting rod. One end of the moving rod is fixedly connected to the side of the mounting plate near the centralizer body, and the other end is connected to one end of the transition rod. The end of the transition rod away from the moving rod is hinged to one end of the adjusting rod, and the end of the adjusting rod away from the transition rod is hinged to the lubrication pipe.

[0024] By adopting the above technical solution, when the drive shaft housing deviates, the straightening plate that is in contact with the rock layer is compressed under pressure, thereby driving the moving rod to move closer to the straightener body. The moving rod drives the transition rod to move, causing the transition rod to rotate the adjusting rod and the lubrication pipe to rotate downward. The conversion head follows the rotation of the lubrication pipe, and the liquid inlet and outlet are connected, allowing the lubricating fluid in the storage sleeve to flow into the lubrication pipe through the liquid inlet and flow to the part of the straightening plate that is in contact with the rock layer through the dripping hole, reducing the wear between the straightening plate and the rock layer and extending its service life. Since the greater the distance the straightening plate moves towards the straightener body, the greater the angle of the lubrication pipe rotating downward, and the more lubricating fluid flows out in the same amount of time, the more the axis of the drive shaft housing deviates, the more sufficient lubrication can be provided to assist the straightening plate and the straightening spring in adjusting the axis of the drive shaft housing.

[0025] Preferably, the centralizer body has a transition groove for the transition rod to slide in, and the centralizer body is fixedly connected to a limiting block for preventing the transition rod from disengaging from the centralizer body, the limiting block being located within the transition groove.

[0026] By adopting the above technical solution, the limiting block can restrict the position of the transition rod in the transition groove, making it difficult for the limiting block to fall out of the transition groove, thereby affecting the straightening effect of the straightener.

[0027] In summary, the present invention has the following beneficial effects:

[0028] 1. The centralizer body can increase the overall diameter of the drive shaft housing, making it less prone to displacement. The centralizing plate is connected to the centralizer body through a centralizing spring, which can balance the forces in all directions when the drive shaft housing is displaced, automatically adjust the position of the drive shaft housing, and reduce the angular deviation of the drive shaft housing axis. The centralizing plate and the support frame can be detachably connected, which makes it convenient for workers to replace the centralizing plate in a timely manner according to the wear condition of the centralizing plate, extend the service life of the overall structure, and improve the centralizing effect.

[0029] 2. The limit bolts can restrict the position of the mounting plate in the mounting groove, thereby preventing the straightening plate from being easily disconnected from the mounting frame and losing its straightening effect.

[0030] 3. When the straightening plate moves and drives the moving rod and transition rod to move, the adjusting rod drives the lubrication pipe to rotate downward, so that the liquid receiving hole rotates to below the liquid outlet hole. The lubricating fluid stored in the liquid storage sleeve flows through the lubrication pipe to the position where the straightening plate rubs against the rock layer, reducing the friction between the straightening plate and the rock layer and extending the service life of the straightening plate. At the same time, it facilitates the straightening spring to adjust the position of the drive shaft housing through the reaction force, thereby adjusting the axis of the drive shaft housing. Attached Figure Description

[0031] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0032] Figure 2 This embodiment of the application is intended to show a partial structural diagram of the straightening component.

[0033] Figure 3 This is a schematic diagram of a partial structure of the transition rod, as shown in the embodiments of this application.

[0034] Figure 4 This is a schematic diagram illustrating a partial structure of the liquid pores in an embodiment of this application.

[0035] Figure 5 This embodiment of the application is intended to show a partial enlarged view of the converter head.

[0036] Figure 6 This is a partial cross-sectional view of the transition groove, as shown in the embodiments of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Drive shaft housing; 2. Centralizer body; 21. Centralizing groove; 22. Adjusting groove; 23. Transition groove; 24. Limiting block; 3. Centralizing assembly; 31. Centralizing plate; 311. Mounting plate; 32. Centralizing spring; 33. Support frame; 331. Mounting groove; 332. Sliding groove; 34. Limiting bolt; 4. Lubrication assembly; 41. Liquid storage sleeve; 411. Liquid outlet; 42. Lubrication pipe; 421. Drip hole; 422. Converter head; 4221. Liquid receiving hole; 43. Moving rod; 44. Transition rod; 45. Adjusting rod. Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings.

[0040] A centralizer for screw drill bits, such as Figure 1 As shown, it includes a centralizer body 2, a centralizer assembly 3, and a lubrication assembly 4. The centralizer body 2 is connected to the drive shaft housing 1. The centralizer assembly 3 is connected to the centralizer body 2 for further centralizing the drive shaft housing 1. The lubrication assembly 4 is connected to the centralizer assembly 3.

[0041] like Figure 1 As shown, the centralizer body 2 is a circular tube structure with its length direction parallel to the length direction of the drive shaft housing 1. The centralizer body 2 is sleeved on the drive shaft housing 1 and fixedly connected to the drive shaft housing 1.

[0042] like Figure 2 As shown, the straightening assembly 3 includes a straightening plate 31, a straightening spring 32, a support frame 33, and a limiting bolt 34. The length direction of the straightening plate 31 is parallel to the length direction of the straightener body 2. Multiple straightening plates 31 are provided, and the multiple straightening plates 31 are evenly arranged circumferentially around the outer wall of the straightener body 2. The straightener body 2 is provided with multiple straightening grooves 21. The length direction of the straightening grooves 21 is parallel to the length direction of the straightener body 2. One end of the straightening spring 32 is welded to the side of the straightening plate 31 near the straightener body 2, and the other end is connected to the side wall of the straightening groove 21 near the straightening plate 31, so that the straightening plate 31 can slide in the direction of approaching or away from the straightener body 2.

[0043] like Figure 2As shown, the straightening plate 31 is connected to the mounting plate 311. The longitudinal section of the mounting plate 311 is L-shaped. Multiple mounting plates 311 are provided. One straightening plate 31 and two mounting plates 311 form a group. The mounting plates 311 in the same group are symmetrically fixed to both ends of the straightening plate 31. Multiple support frames 33 are provided. One mounting plate 311 and one support frame 33 form a group. The mounting plates 311 in the same group are slidably connected to the support frame 33. The support frame 33 is fixedly connected to the outer wall of the straightener body 2. The support frame 33 has a mounting groove 331 for the mounting plate 311 to slide into. The mounting groove 331 is connected to one side of the support frame 33. The support frame 33 also has a sliding groove 332 for the mounting plate 311 to slide in the direction close to or away from the straightener body 2. The sliding groove 332 is connected to the mounting groove 331.

[0044] like Figure 2 As shown, the limiting component can be a buckle, which is connected to one side of the support frame 33 where the mounting groove 331 is opened, and is used to limit the position of the mounting plate 311 in the mounting groove 331. Alternatively, it can be a limiting bolt 34. In this embodiment, the limiting bolt 34 is used. Multiple limiting bolts 34 are provided. The limiting bolt 34 passes through one side of the support frame 33 where the mounting groove 331 is opened and is threadedly connected to the mounting groove 331, so that the limiting bolt 34 restricts the position of the mounting plate 311, thereby making it difficult for the mounting plate 311 to fall out of the mounting groove 331, and facilitating the loading, unloading and straightening of the plate 31 by the workers.

[0045] In use, the operator slides the mounting plate 311 in the mounting groove 331 until it connects with the support frame 33, and tightens the limiting bolt 34 to limit the position of the mounting plate 311 in the support frame 33, thus completing the installation of the straightening plate 31. When the straightening plate 31 and the drive shaft housing 1 rotate, the side of the multiple straightening plates 31 away from the straightener body 2 comes into contact with and rubs against the rock layer. When the drive shaft housing 1 deviates, the straightening spring 32 is squeezed by the straightening plate 31 and the straightener body 2, and at the same time generates a reaction force, pushing the deviated position of the drive shaft housing 1 towards the center, thereby achieving the effect of adjusting the drive shaft housing 1 according to the deviation, reducing the excessive friction between the drive shaft housing 1 and the rock layer due to excessive deviation.

[0046] like Figure 2 and Figure 3 As shown, the lubrication assembly 4 includes a reservoir sleeve 41, a lubrication pipe 42, a moving rod 43, a transition rod 44, and an adjusting rod 45. The reservoir sleeve 41 is sleeved on the centralizer body 2 and fixedly connected to the centralizer body 2. The reservoir sleeve 41 is located near the end of the centralizer body 2 away from the drill bit. The bottom surface of the reservoir sleeve 41 has multiple outlet holes 411 (e.g., ...). Figure 4 As shown in the figure, multiple liquid outlet holes 411 are located above the straightening tank 21.

[0047] like Figure 5 and Figure 6 As shown, a lubricating pipe 42, which is rotatably connected to the liquid storage sleeve 41, has a drip hole 421 at one end. The centralizer body 2 has an adjustment groove 22 for the lubricating pipe 42 to rotate. A conversion head 422 is connected to the end of the lubricating pipe 42 away from the drip hole 421. The longitudinal section of the conversion head 422 is circular. A liquid receiving hole 4221 is opened on the side of the conversion head 422 away from the drip hole 421. The conversion head 422 is engaged with the liquid outlet 411 so that when the lubricating pipe 42 is horizontal, the conversion head 422 can block the liquid outlet 411. When the lubricating pipe 42 rotates downward, the lubricating fluid stored in the liquid storage sleeve 41 can flow into the lubricating pipe 42 through the liquid receiving hole 4221 and flow out from the drip hole 421.

[0048] like Figure 6 As shown, one end of the moving rod 43 is fixedly connected to the side of the mounting plate 311 near the centralizer body 2. The outer wall of the centralizer body 2 is provided with a transition groove 23 for the moving rod 43 to slide. The transition groove 23 is located below the adjustment groove 22 and communicates with the adjustment groove 22. One end of the transition rod 44 is fixedly connected to the end of the moving rod 43 away from the mounting plate 311. The transition rod 44 is located in the transition groove 23 and is slidably connected to the centralizer body 2. The centralizer body 2 is connected to a limiting block 24. The limiting block 24 is located in the transition groove 23 and is fixedly connected to the centralizer body 2. One side of the limiting block 24 is flush with the outer wall of the centralizer body 2 and is used to limit the position of the transition rod 44 in the transition groove 23. One end of the adjustment rod 45 is hinged to the end of the transition rod 44 away from the moving rod 43, and the other end is hinged to the side wall of the lubrication pipe 42 with a drip hole 421.

[0049] The usage process of this invention is as follows:

[0050] Slide the mounting plate 311 into the mounting groove 331, rotate the limiting bolt 34 to connect the limiting bolt 34 with the support frame 33, which can limit the position of the mounting plate 311 in the mounting groove 331, so that the mounting plate 311 can slide stably in the sliding groove 332. Weld the two ends of the straightening spring 32 to the straightening plate 31 and the straightener body 2 respectively to complete the installation of the straightening plate 31.

[0051] When the drive shaft housing 1 rotates, the stabilizer body 2 and the stabilizer plate 31 rotate with the drive shaft housing 1. The stabilizer plate 31 remains in contact with the rock layer. When the drive shaft housing 1 deviates, the stabilizer plate 31 on one side moves towards the stabilizer body 2, causing the stabilizer spring 32 to compress. Multiple stabilizer springs 32 balance the force on the drive shaft housing 1 through deformation, causing the axis of the drive shaft housing 1 to gradually approach the rock layer, achieving the stabilization effect.

[0052] As the straightening plate 31 gradually moves closer to the rock stratum, the moving rod 43 and the transition rod 44 follow the straightening plate 31 and move closer to the straightener body 2, causing the adjusting rod 45 to rotate downwards. This causes the lubrication pipe 42 to rotate from horizontal to downward tilt, and the liquid receiving hole 4221 rotates to below the liquid outlet hole 411, so that the liquid storage sleeve 41 is connected to the lubrication pipe 42. The liquid in the liquid storage sleeve 41 flows through the drip hole 421 to the space between the straightening plate 31 and the rock stratum, reducing the friction between them. The smaller the distance between the straightening plate 31 and the straightener body 2, the greater the downward tilt angle of the lubrication pipe 42, and the more lubricating liquid flows out, which helps to reduce the wear of the straightening plate 31.

[0053] When the straightening plate 31 needs to be replaced, the straightening spring 32 can be cut off and the limiting bolt 34 can be rotated to disengage from the support frame 33, and the mounting plate 311 can be slid out of the mounting groove 331.

[0054] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A centralizer for a screw drill bit, comprising a centralizer body (2), wherein the centralizer body (2) is fixedly connected to a drive shaft housing (1), characterized in that: It also includes a straightening component (3), which includes a straightening plate (31), a straightening spring (32), and a support frame (33). Multiple straightening plates (31) are provided, and the multiple straightening plates (31) are evenly arranged circumferentially along the outer wall of the straightener body (2). One end of the straightening spring (32) is connected to the end of the straightening plate (31) near the straightener body (2), and the other end is connected to the side of the outer wall of the straightener body (2) near the straightening plate (31). Multiple support frames (33) are provided accordingly. Two support frames (33) and one straightening plate (31) form a group. The support frames (33) in the same group are located at both ends of the straightening plate (31). The support frames (33) are fixedly connected to the straightener body (2), and the support frames (33) and the straightening plate (31) are detachably connected. The straightener body (2) is connected to a lubrication assembly (4) for lubricating the worn parts of the straightener plate (31); The lubrication assembly (4) includes a reservoir sleeve (41) and a lubrication tube (42). The reservoir sleeve (41), which stores the lubricating fluid, is located near the end of the stabilizer body (2) away from the drill bit and is connected to the stabilizer body (2). The reservoir sleeve (41) has multiple outlet holes (411) on its bottom surface. The lubrication tube (42) is provided with multiple outlet holes (411) respectively. The multiple lubrication tubes (42) are rotatably connected to the reservoir sleeve (41) relative to each other. The lubrication tubes (42) are evenly distributed around the bottom surface of the reservoir sleeve (41) and are located above the support frame (33). The reservoir sleeve (41) has a drip hole (421) for the lubricating fluid to flow out. The end of the lubrication tube (42) away from the drip hole (421) is fixedly connected to a conversion head (422). The conversion head (422) is located inside the liquid outlet (411) and is rotatably connected to the bottom surface of the liquid storage sleeve (41). The longitudinal section of the conversion head (422) is circular, and a liquid receiving hole (4221) is opened on the side of the conversion head (422) away from the drip hole (421).

2. A centralizer for a screw drill bit according to claim 1, characterized in that: The body (2) of the straightener has a plurality of straightening grooves (21) corresponding to the position of the straightening plate (31). The length direction of the straightening grooves (21) is parallel to the length direction of the straightening plate (31). The end of the straightening spring (32) away from the straightening plate (31) is connected to the inner wall of the straightening groove (21).

3. A centralizer for a screw drill bit according to claim 2, characterized in that: The straightening plate (31) is connected to the mounting plate (311). Two mounting plates (311) and one straightening plate (31) form a group. The two mounting plates (311) in the same group are fixedly connected to both ends of the straightening plate (31). The mounting plate (311) is slidably connected to the support frame (33). The straightening component (3) also includes a limiting member for limiting the relative position of the mounting plate (311) and the support frame (33). The limiting member is connected to the support frame (33).

4. A centralizer for a screw drill bit according to claim 3, characterized in that: The limiting component is a limiting bolt (34), and multiple limiting bolts (34) are provided. The support frame (33) has an installation groove (331) for the mounting plate (311) to slide into. The multiple limiting bolts (34) pass through one end of the support frame (33) where the installation groove (331) is opened, and the limiting bolts (34) are threadedly connected to the support frame (33).

5. A centralizer for a screw drill bit according to claim 4, characterized in that: The length direction of the straightening plate (31) is parallel to the length direction of the straightening body (2).

6. A centralizer for a screw drill bit according to claim 3, characterized in that: The lubrication assembly (4) further includes a moving rod (43), a transition rod (44), and an adjusting rod (45). One end of the moving rod (43) is fixedly connected to the side of the mounting plate (311) near the centralizer body (2), and the other end is connected to one end of the transition rod (44). The end of the transition rod (44) away from the moving rod (43) is hinged to one end of the adjusting rod (45), and the end of the adjusting rod (45) away from the transition rod (44) is hinged to the lubrication pipe (42).

7. A centralizer for a screw drill bit according to claim 6, characterized in that: The body (2) of the stabilizer has a transition groove (23) for sliding the transition rod (44). The body (2) of the stabilizer is fixedly connected to a limiting block (24) for making it difficult for the transition rod (44) to detach from the body (2). The limiting block (24) is located in the transition groove (23).

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