Adapter sleeve machining clamping tool capable of preventing extrusion deformation

Abstract

The invention relates to the technical field of adapter sleeve machining, and discloses an adapter sleeve machining clamping tool capable of preventing extrusion deformation, which comprises a table body, a clamping mechanism and a driving mechanism are mounted on the surface of the table body, the driving mechanism is arranged on the surface of the clamping mechanism, the clamping mechanism comprises a clamping assembly and a limiting assembly, and the limiting assembly is arranged on the surface of the clamping mechanism. The clamping assembly is installed on the surface of the table body, the limiting assembly is installed on the surface of the clamping assembly and located at the bottom of the table body, the driving mechanism comprises a driving assembly and a linkage assembly, and the driving assembly is installed on the surfaces of the limiting assembly and the table body. According to the clamping device, the adapter sleeve can be conveniently and rapidly clamped, the clamping assembly is limited under the self-locking effect of the lead screw, then the adapter sleeve is not prone to disengagement after being fixed, extrusion deformation caused by large force application when the adapter sleeve is fixed can be avoided, and the function of rotationally adjusting the fixed adapter sleeve can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of adapter sleeve processing, in particular to an adapter sleeve processing clamping tool for preventing extrusion deformation. Background Art

[0002] The adapter sleeve is the most commonly used component when positioning a bearing with a tapered hole on a cylindrical shaft. Because this sleeve can be used for a smooth shaft or a stepped shaft, it is mostly used on annular tubular objects such as bearings and water pipes. The main purpose is to fix the object. There are openings on the circular bushing of the adapter sleeve. Therefore, when processing the adapter sleeve, it is usually necessary to cut the circular ring of the adapter sleeve, and when cutting the adapter sleeve, it needs to be clamped and fixed first.

[0003] After searching, the Chinese patent with publication number CN115971933A discloses a clamping device for positioning a clamping sleeve, but there are still the following problems: 1. The transmission between multiple bevel gears and screw rods is set to make multiple clamping rods close to each other to fix the adapter sleeve, which is not convenient and fast enough. At the same time, the motor is used as the driving source for the clamping operation. When the clamping force is too large, the adapter sleeve is easily squeezed and deformed; 2. After the adapter sleeve is clamped and fixed, the position cannot be adjusted. The operator needs to release the limit and then make adjustments. The operation is cumbersome, and the flexibility and practicality are low, which cannot meet the use requirements. Summary of the invention

[0004] Technical issues solved In view of the shortcomings of the prior art, the present invention provides a clamping tool for processing a tightening sleeve that prevents extrusion and deformation, mainly to solve the problem that clamping is not convenient and quick enough, and the clamping operation is performed by using a motor as a driving source. When the clamping force is too large, the tightening sleeve is easily squeezed and deformed, and the position cannot be adjusted, the operation is cumbersome, and the flexibility and practicality are low.

[0005] Technical Solution To achieve the above object, the present invention provides the following technical solutions: A clamping tool for processing a tightening sleeve to prevent extrusion deformation comprises a table body, a clamping mechanism and a driving mechanism are installed on the surface of the table body, the driving mechanism is arranged on the surface of the clamping mechanism, the clamping mechanism comprises a clamping assembly and a limiting assembly, the clamping assembly is installed on the surface of the table body, the limiting assembly is installed on the surface of the clamping assembly and is located at the bottom of the table body, the driving mechanism comprises a driving assembly and a linkage assembly, the driving assembly is installed on the surface of the limiting assembly and the table body and is located at the bottom of the table body, and the linkage assembly is installed on the surfaces of the driving assembly and the clamping assembly.

[0006] As a further solution of the present invention, the clamping assembly also includes a rotating rod, a roller, a rubber sleeve and a roller. The rotating rod passes through the vertical cylinder and is rotatably connected to the inner wall of the vertical cylinder through a bearing. The roller is fixedly connected to the upper end of the rotating rod. The rubber sleeve is fixedly mounted on the surface of the roller. The roller is rotatably connected to the surface of the slider through a bearing.

[0007] As a further solution of the present invention, the clamping assembly also includes a rotating rod, a roller, a rubber sleeve and a roller. The rotating rod passes through the vertical cylinder and is rotatably connected to the inner wall of the vertical cylinder through a bearing. The roller is fixedly connected to the upper end of the rotating rod. The rubber sleeve is fixedly mounted on the surface of the roller. The roller is rotatably connected to the surface of the slider through a bearing.

[0008] As a further solution of the present invention, the limiting assembly includes a vertical rod, a circular gear, a fixed plate, a screw and a moving block. The vertical rod is rotatably connected to the bottom of the platform body through a bearing, the circular gear is fixedly connected to the lower end of the vertical rod, the fixed plate is fixedly connected to the bottom of the platform body, the screw is rotatably connected to the surface of the fixed plate through a bearing, the moving block is threadedly sleeved on the surface of the screw, and the guide plate is fixedly connected to the surface of the vertical rod.

[0009] As a further solution of the present invention, the limit assembly also includes a tooth plate, a guide rod and a docking groove. The tooth plate is fixedly connected to the surface of the moving block and meshes with the circular gear. The guide rod slides through the moving block and is fixedly connected to the surface of the fixed plate. The docking groove is opened on the surface of one end of the screw rod.

[0010] As a further solution of the present invention, the driving assembly includes a support plate, a spline rod and a docking column. The support plate is fixedly connected to the bottom of the platform, the spline rod slides through the support plate and is fixedly connected to one end of the docking column, and the docking groove is adapted to the docking column.

[0011] As a further solution of the present invention, the drive assembly also includes a first short plate, a fixed rod, a second short plate, a limiting ring and a handle. The first short plate is movably sleeved on the surface of one end of the spline rod, the second short plate is fixedly sleeved on the surface of one end of the screw rod, the two ends of the fixed rod are respectively fixedly connected to the surfaces of the first short plate and the second short plate, the limiting rings are two in number and fixedly sleeved on the surface of one end of the spline rod close to the screw rod, and the handle is fixedly connected to the end of the spline rod away from the screw rod.

[0012] As a further solution of the present invention, the linkage assembly includes a connecting plate, a spline tube, a first bevel gear and a second bevel gear. The connecting plate is fixedly sleeved on the surface of the lower end of the vertical cylinder, the spline tube is slidably sleeved on the surface of the spline rod and is rotatably connected to the surface of the connecting plate through a bearing, the first bevel gear is fixedly connected to the lower end of the rotating rod, the second bevel gear is fixedly sleeved on the surface of the spline tube, and the first bevel gear is meshed with the second bevel gear.

[0013] Beneficial Effects Compared with the prior art, the present invention provides a clamping tool for processing an adapter sleeve to prevent extrusion deformation, which has the following beneficial effects: 1. The present invention realizes the function of quickly clamping and fixing the adapter sleeve through the cooperation of the slider, the vertical cylinder, the guide plate, the rotating rod, the drum, the rubber sleeve and the roller, solves the problem of requiring transmission between multiple bevel gears and screw rods to make multiple clamping rods close to each other to fix the adapter sleeve, and can clamp the adapter sleeve conveniently and quickly.

[0014] 2. The present invention realizes the function of driving the clamping assembly through the cooperation of the vertical rod, circular gear, fixed plate, screw rod, movable block, tooth plate, guide rod and docking groove, and limits the clamping assembly under the self-locking action of the screw rod, so that the clamping sleeve will not be easily detached after being fixed.

[0015] 3. The present invention realizes the function of manually driving the limit assembly to operate through the cooperation of the support plate, the spline rod, the docking column, the first short plate, the fixing rod, the second short plate, the limit ring and the handle, so that the clamping assembly can be operated to fix the tightening sleeve, and whether to stop is determined according to the feedback from the hand to avoid large force when fixing the tightening sleeve to cause extrusion and deformation.

[0016] 4. The present invention realizes the function of rotationally adjusting the fixed adapter sleeve through the cooperation of the connecting plate, the spline tube, the first bevel gear, the second bevel gear, the spline rod and the rotating rod. The operator does not need to release the limit to make adjustments. The operation is simple and the flexibility and practicality are high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front three-dimensional structure of a clamping tool for processing an adapter sleeve to prevent extrusion deformation proposed by the present invention; Figure 2 A bottom-up three-dimensional structural schematic diagram of a clamping tool for processing an adapter sleeve for preventing extrusion deformation proposed by the present invention; Figure 3 A schematic diagram of a front side partial cross-sectional three-dimensional structure of a clamping tool for processing an adapter sleeve to prevent extrusion deformation proposed by the present invention; Figure 4 The invention provides a clamping tool for processing a clamping sleeve to prevent extrusion deformation. Figure 3 A is a schematic diagram of the enlarged structure of the middle part; Figure 5 The invention provides a clamping tool for processing a clamping sleeve to prevent extrusion deformation. Figure 3 Schematic diagram of the enlarged structure of B; Figure 6 The present invention is a schematic diagram of the three-dimensional structure of a docking column and a limiting ring of a clamping tool for processing an adapter sleeve to prevent extrusion deformation.

[0018] In the figure: 1, table body; 2, clamping mechanism; 3, driving mechanism; 21, clamping assembly; 22, limiting assembly; 31, driving assembly; 32, linkage assembly; 211, slider; 212, vertical cylinder; 213, guide plate; 214, rotating rod; 215, roller; 216, rubber sleeve; 217, roller; 221, vertical rod; 222, circular gear; 223, fixed plate; 224, screw rod; 225, moving block; 226, tooth plate; 227, guide rod; 228, docking groove; 311, supporting plate; 312, spline rod; 313, docking column; 314, first short plate; 315, fixed rod; 316, second short plate; 317, limiting ring; 318, handle; 321, connecting plate; 322, spline tube; 323, first bevel gear; 324, second bevel gear. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0021] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] Reference Figure 1-Figure 6 A clamping tool for processing a tightening sleeve to prevent extrusion deformation includes a table body 1, a clamping mechanism 2 and a driving mechanism 3 are installed on the surface of the table body 1, the driving mechanism 3 is arranged on the surface of the clamping mechanism 2, the clamping mechanism 2 includes a clamping component 21 and a limiting component 22, the clamping component 21 is installed on the surface of the table body 1, the limiting component 22 is installed on the surface of the clamping component 21 and is located at the bottom of the table body 1, the driving mechanism 3 includes a driving component 31 and a linkage component 32, the driving component 31 is installed on the surface of the limiting component 22 and the table body 1 and is located at the bottom of the table body 1, and the linkage component 32 is installed on the surfaces of the driving component 31 and the clamping component 21.

[0023] In particular, in the present invention, the clamping assembly 21 includes a slider 211, a vertical cylinder 212 and a guide plate 213. The slider 211 is slidably clamped on the surface of the platform 1, the vertical cylinder 212 penetrates and is fixedly connected to the surface of the slider 211, the guide plate 213 is sleeved on the surface of the vertical cylinder 212, and is installed on the surface of the limit assembly 22.

[0024] It should be noted that there are four sliders 211, four vertical cylinders 212 and four guide plates 213. The vertical cylinder 212 inside the guide plate 213 can be squeezed by rotating, so that the vertical cylinder 212 and the slider 211 can be moved. A sliding groove compatible with the slider 211 is provided on the surface of the platform 1. The slider 211 is slidably connected in the sliding groove, and the sliding groove serves as a limiting guide for the slider 211.

[0025] In particular, in the present invention, the clamping assembly 21 also includes a rotating rod 214, a roller 215, a rubber sleeve 216 and a roller 217. The rotating rod 214 penetrates the vertical cylinder 212 and is rotatably connected to its inner wall through a bearing. The roller 215 is fixedly connected to the upper end of the rotating rod 214. The rubber sleeve 216 is fixedly sleeved on the surface of the roller 215. The roller 217 is rotatably connected to the surface of the slider 211 through a bearing.

[0026] It should be noted that there are four rollers 215 and four rubber sleeves 216. The four rollers 215 are respectively fixedly connected to the upper ends of the four rotating rods 214. The friction between the rubber sleeves 216 and the tightening sleeve is increased, so that the roller 215 can better fix the tightening sleeve. At the same time, the tightening sleeve is protected to prevent the roller 215 from directly contacting and clamping the tightening sleeve and causing damage.

[0027] In particular, in the present invention, the limiting assembly 22 includes a vertical rod 221, a circular gear 222, a fixed plate 223, a screw rod 224 and a moving block 225. The vertical rod 221 is rotatably connected to the bottom of the platform 1 through a bearing, the circular gear 222 is fixedly connected to the lower end of the vertical rod 221, the fixed plate 223 is fixedly connected to the bottom of the platform 1, the screw rod 224 is rotatably connected to the surface of the fixed plate 223 through a bearing, the moving block 225 is threadedly sleeved on the surface of the screw rod 224, and the guide plate 213 is fixedly connected to the surface of the vertical rod 221.

[0028] It should be noted that there are two fixed plates 223, and both are fixedly connected to the bottom of the platform 1. The rotation of the screw rod 224 can drive the moving block 225 to move, and then the tooth plate 226 moves to drive the circular gear 222 to rotate, so that the vertical rod 221 rotates to drive the guide plate 213 to rotate, and the vertical cylinder 212 is squeezed and moved, so that the four rollers 215 are close to each other to fix the tightening sleeve.

[0029] In particular, in the present invention, the limiting assembly 22 also includes a tooth plate 226, a guide rod 227 and a docking groove 228. The tooth plate 226 is fixedly connected to the surface of the moving block 225 and meshes with the circular gear 222. The guide rod 227 slides through the moving block 225 and is fixedly connected to the surface of the fixed plate 223. The docking groove 228 is opened on the surface of one end of the screw rod 224.

[0030] It should be noted that there are two guide rods 227, which serve as guides and limits for the moving block 225, so that the moving block 225 does not rotate when it moves with the rotation of the screw rod 224. When the docking column 313 is inserted into it through the docking groove 228, the rotating spline rod 312 can drive the screw rod 224 to rotate, thereby realizing the adjustment of the moving block 225 and the tooth plate 226.

[0031] In particular, in the present invention, the driving assembly 31 includes a support plate 311, a spline rod 312 and a docking column 313. The support plate 311 is fixedly connected to the bottom of the platform 1, the spline rod 312 slides through the support plate 311 and is fixedly connected to one end of the docking column 313, and the docking groove 228 is adapted to the docking column 313.

[0032] It should be noted that the spline rod 312 is limited by the support plate 311, and the spline rod 312 can move and rotate on its surface. By disengaging the docking column 313 from the docking groove 228, the spline rod 312 can independently drive the linkage assembly 32 to operate, thereby rotating the rotating rod 214, the roller 215 and the rubber sleeve 216 to achieve adjustment of the position of the fixing sleeve.

[0033] In particular, in the present invention, the driving assembly 31 also includes a first short plate 314, a fixed rod 315, a second short plate 316, a limiting ring 317 and a handle 318. The first short plate 314 is movably sleeved on the surface of one end of the spline rod 312, the second short plate 316 is fixedly sleeved on the surface of one end of the screw rod 224, the two ends of the fixed rod 315 are respectively fixedly connected to the surfaces of the first short plate 314 and the second short plate 316, the number of the limiting rings 317 is two, and they are fixedly sleeved on the surface of one end of the spline rod 312 close to the screw rod 224, and the handle 318 is fixedly connected to the end of the spline rod 312 away from the screw rod 224.

[0034] It should be noted that, through the setting of the limit ring 317, the spline rod 312 will not be separated from the first short plate 314, and under the action of the second short plate 316 and the fixing rod 315, the spline rod 312 and the screw rod 224 are limited, and the spline rod 312 will not be affected by the first short plate 314 when rotating. When the docking column 313 is inserted into the docking groove 228 on the screw rod 224, rotating the spline rod 312 can drive the screw rod 224 to rotate. When the spline rod 312 is pulled outward to make the docking column 313 disengage from the docking groove 228 on the screw rod 224, rotating the spline rod 312 will not drive the screw rod 224 to rotate, and then drive the corresponding roller 215 to rotate independently.

[0035] In particular, in the present invention, the linkage assembly 32 includes a connecting plate 321, a spline tube 322, a first bevel gear 323 and a second bevel gear 324. The connecting plate 321 is fixedly sleeved on the surface of the lower end of the vertical cylinder 212, the spline tube 322 is slidably sleeved on the surface of the spline rod 312, and is rotatably connected to the surface of the connecting plate 321 through a bearing. The first bevel gear 323 is fixedly connected to the lower end of the rotating rod 214, and the second bevel gear 324 is fixedly sleeved on the surface of the spline tube 322. The first bevel gear 323 is meshed with the second bevel gear 324.

[0036] It should be noted that the spline rod 312 can move in the spline tube 322 and when the spline rod 312 rotates, it can drive the spline tube 322 to rotate, thereby rotating the second bevel gear 324, the first bevel gear 323, the rotating rod 214 and the roller 215.

[0037] The working principle of the present invention is as follows: when in use, the adapter sleeve is placed on the platform 1, the handle 318 is held to move the spline rod 312, the docking column 313 is inserted into the docking groove 228, and then the handle 318 is turned to rotate the spline rod 312 and the spline tube 322. The rotation of the spline rod 312 causes the docking column 313, the screw rod 224, the second short plate 316, the fixed rod 315 and the first short plate 314 to rotate, and the moving block 225 is driven by the screw rod 224 to rotate. The guide plate 213 rotates and moves the vertical cylinder 212, thereby driving the slider 211, the roller 215, the rubber sleeve 216 and the roller 217 to move. Due to the chamfering treatment of one end of the roller 217, when the roller 217 contacts and squeezes the adapter sleeve, the adapter sleeve is supported on the roller 217. 7 surface, as the roller 215 and the rubber sleeve 216 move and are in close contact with the adapter sleeve, the adapter sleeve is fixed. During the fixing process, the rotation of the spline tube 322 causes the second bevel gear 324 and the first bevel gear 323 to rotate, thereby causing the rotating rod 214 and the roller 215 to rotate. When the handle 318 is no longer rotated after the fixing is completed, the roller 215 no longer rotates, and the fixing of the adapter sleeve is completed. When the adapter sleeve needs to be rotated, the handle 318 is held to move the spline rod 312 outward to disengage the docking column 313 from the docking groove 228 on the screw rod 224, and then the handle 318 is rotated to cause the spline rod 312 to drive the spline tube 322 to rotate. Under the transmission of the second bevel gear 324 and the first bevel gear 323, the rotating rod 214, the roller 215 and the rubber sleeve 216 are rotated, thereby driving the adapter sleeve to rotate. After the adjustment is completed, the docking column 313 is inserted into the docking groove 228 for limiting.

[0038] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The above embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A clamping tool for processing a clamping sleeve to prevent extrusion deformation, comprising a table (1), characterized in that: The surface of the platform (1) is provided with a clamping mechanism (2) and a driving mechanism (3); the driving mechanism (3) is arranged on the surface of the clamping mechanism (2); the clamping mechanism (2) comprises a clamping component (21) and a limiting component (22); the clamping component (21) is installed on the surface of the platform (1); the limiting component (22) is installed on the surface of the clamping component (21) and is located at the bottom of the platform (1); the driving mechanism (3) comprises a driving component (31) and a linkage component (32); the driving component (31) is installed on the limiting component (22) and the surface of the platform (1) and is located at the bottom of the platform (1); and the linkage component (32) is installed on the surfaces of the driving component (31) and the clamping component (21).

2. The clamping tool for processing an adapter sleeve to prevent extrusion deformation according to claim 1 is characterized in that: The clamping assembly (21) comprises a slider (211), a vertical cylinder (212) and a guide plate (213); the slider (211) is slidably clamped on the surface of the platform (1); the vertical cylinder (212) penetrates and is fixedly connected to the surface of the slider (211); the guide plate (213) is sleeved on the surface of the vertical cylinder (212) and mounted on the surface of the limit assembly (22).

3. The clamping tool for processing an adapter sleeve to prevent extrusion deformation according to claim 2, characterized in that: The clamping assembly (21) further comprises a rotating rod (214), a roller (215), a rubber sleeve (216) and a roller (217); the rotating rod (214) passes through the vertical cylinder (212) and is rotatably connected to the inner wall thereof via a bearing; the roller (215) is fixedly connected to the upper end of the rotating rod (214); the rubber sleeve (216) is fixedly sleeved on the surface of the roller (215); and the roller (217) is rotatably connected to the surface of the slider (211) via a bearing.

4. The clamping tool for processing an adapter sleeve to prevent extrusion deformation according to claim 2, characterized in that: The position limiting assembly (22) comprises a vertical rod (221), a circular gear (222), a fixed plate (223), a screw rod (224) and a moving block (225); the vertical rod (221) is rotatably connected to the bottom of the platform (1) via a bearing; the circular gear (222) is fixedly connected to the lower end of the vertical rod (221); the fixed plate (223) is fixedly connected to the bottom of the platform (1); the screw rod (224) is rotatably connected to the surface of the fixed plate (223) via a bearing; the moving block (225) is threadedly sleeved on the surface of the screw rod (224); and the guide plate (213) is fixedly connected to the surface of the vertical rod (221).

5. The clamping tool for processing an adapter sleeve to prevent extrusion deformation according to claim 4, characterized in that: The limit assembly (22) further comprises a tooth plate (226), a guide rod (227) and a docking groove (228); the tooth plate (226) is fixedly connected to the surface of the moving block (225) and meshes with the circular gear (222); the guide rod (227) slides through the moving block (225) and is fixedly connected to the surface of the fixed plate (223); and the docking groove (228) is formed on the surface of one end of the screw rod (224).

6. The clamping tool for processing an adapter sleeve to prevent extrusion deformation according to claim 5, characterized in that: The driving assembly (31) comprises a support plate (311), a spline rod (312) and a docking column (313); the support plate (311) is fixedly connected to the bottom of the platform (1); the spline rod (312) slides through the support plate (311) and is fixedly connected to one end of the docking column (313); and the docking groove (228) is adapted to the docking column (313).

7. The clamping tool for processing an adapter sleeve to prevent extrusion deformation according to claim 6, characterized in that: The driving assembly (31) further comprises a first short plate (314), a fixing rod (315), a second short plate (316), a limiting ring (317) and a handle (318); the first short plate (314) is movably sleeved on the surface of one end of the spline rod (312); the second short plate (316) is fixedly sleeved on the surface of one end of the screw rod (224); the two ends of the fixing rod (315) are respectively fixedly connected to the surfaces of the first short plate (314) and the second short plate (316); there are two limiting rings (317) which are fixedly sleeved on the surface of one end of the spline rod (312) close to the screw rod (224); and the handle (318) is fixedly connected to the end of the spline rod (312) away from the screw rod (224).

8. The clamping tool for processing an adapter sleeve to prevent extrusion deformation according to claim 2, characterized in that: The linkage assembly (32) comprises a connecting plate (321), a spline tube (322), a first bevel gear (323) and a second bevel gear (324); the connecting plate (321) is fixedly sleeved on the surface of the lower end of the vertical cylinder (212); the spline tube (322) is slidably sleeved on the surface of the spline rod (312) and is rotationally connected to the surface of the connecting plate (321) via a bearing; the first bevel gear (323) is fixedly connected to the lower end of the rotating rod (214); the second bevel gear (324) is fixedly sleeved on the surface of the spline tube (322); and the first bevel gear (323) is meshed with the second bevel gear (324).

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