A feeding device for a bearing end surface grinding machine

Abstract

The present invention discloses a feeding device for a bearing end surface grinder, which relates to the technical field of feeding equipment, and comprises a base, an operating table is arranged at the upper end of the base, and a transmission component is arranged in the inner cavity of the base and below the operating table, and the bearing is transported by the transmission component; the feeding device of the bearing end surface grinder pushes the telescopic rod to move up and down when the end away from the push block moves upward or downward, and since the outer surface of the telescopic rod is slidably connected with the inner wall of the guide cylinder, it is ensured that the telescopic rod remains stable as a whole when moving, and the telescopic rod is prevented from being offset when moving, thereby causing the bearing placement position to deviate; at the same time, when the telescopic rod moves, the lower end of the movable block connected to the upper end thereof is driven to be connected, so that when the telescopic rod moves, power can be provided to the pushing component, and the upper end of the guide cylinder is connected with the lower end of the limit column, so that the pushing component is stably located at the upper end of the guide cylinder, and it is prevented from falling off during transportation.

Description

Technical Field

[0001] The invention relates to a feeding equipment technology, in particular to a feeding device for a bearing end surface grinder. Background Art

[0002] A bearing is a component used to support a shaft or rotating mechanism, which can reduce friction and resistance and improve the efficiency of mechanical operation. The structure of a bearing is usually composed of components such as balls, rollers or tapered rollers, and is supported and fixed by a bearing cap or bearing seat. Bearings are widely used and are commonly found in various types of machinery and equipment components. Grinding machines are required in the bearing processing process.

[0003] The utility model patent with publication number CN218663785U discloses a feeding device for a bearing end face grinder. The feeding device for the bearing end face grinder installs a feeding turntable mechanism on the outlet side of the elevator. The elevator feeds the bearing workpiece into the turntable. The motor drives the turntable, which drives the bearing workpiece to rotate and move, so that the bearing workpiece with the outer diameter and height meeting the requirements enters the channel through the entrance of the channel. The turntable drives the bearing workpiece entering the channel to move toward the outlet of the channel, and causes the iron filings, impurities, carbon slag and other foreign matter carried on the bearing workpiece to fall off and be discharged through the leakage hole. The utility model feeding device can greatly reduce the problems of abnormal material jamming and material breaking of the end face grinder, effectively prevent foreign matter and bearing workpieces with abnormal size from entering the end face grinder, causing product quality abnormalities and equipment damage, and improve the product qualification rate of the bearing end face grinding process.

[0004] When the existing equipment is in use, the bearing is not accurately placed in the working position of the grinder during the loading process, which may lead to inaccurate processing, affect the processing quality of the bearing, or even damage the workpiece or grinder. In addition, the operation is unstable during transmission, causing the bearing to slip or fall during transportation, which may lead to production interruption, increased manual intervention, and even damage to the equipment. Therefore, a loading device for a bearing end face grinder was developed. Summary of the invention

[0005] The object of the present invention is to provide a feeding device for a bearing end surface grinder to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a feeding device for a bearing end surface grinder, comprising a base, an operating table is arranged at the upper end of the base, and a transmission component is arranged in the inner cavity of the base and below the operating table, and the bearing is transported through the transmission component;

[0007] A pushing assembly, which is assembled on the upper end of the base and is used to accurately place the bearing on the transmission assembly;

[0008] The pushing assembly includes a movable block, a limit column is provided on the outer surface of the movable block, an adjusting rod is slidably installed inside the limit column, an annular groove is provided at the lower end of the outer surface of the adjusting rod, and a positioning rod is provided at one end of the movable block, and the outer surface of the positioning rod is slidably connected to the inner wall of the annular groove;

[0009] The outer surface of the adjusting rod is provided with a positioning block, and a rotating drum is slidably mounted on the outer surfaces of the adjusting rod and the positioning block, and a sliding groove is provided on the outer surface of the rotating drum;

[0010] A protective tube is provided at the upper end of the limiting column, a fixing block is provided on the inner wall of the protective tube, and the outer surface of the fixing block is slidably connected to the inner wall of the sliding groove;

[0011] A baffle is provided at the upper end of the rotating cylinder, a rotating block is provided at the upper end of the adjusting rod, a sleeve is provided above the baffle, a movable groove is provided on the inner wall of the sleeve, the upper end of the rotating block penetrates and extends to the inner cavity of the sleeve, and the outer surface of the rotating block is slidably connected to the inner wall of the movable groove;

[0012] The inner cavity of the sleeve is provided with a material storage barrel, and the lower end of the material storage barrel is in contact with the upper end of the rotating block.

[0013] As a further optimization solution of the present invention, a through hole is opened at the lower end of the sleeve, and a delivery pipe is arranged on the inner wall of the through hole.

[0014] As a further optimization solution of the present invention, a ring is sleeved on the outer surface of the sleeve.

[0015] As a further optimization scheme of the present invention, the transmission component includes a driving member connected to the base, a driving shaft is provided at the end of the driving member, a plurality of groups of support rods are provided on the outer surface of the driving shaft, and the plurality of groups of support rods are evenly distributed on the outer surface of the driving shaft, and the lower end of the support rod is connected to the base.

[0016] As a further optimization solution of the present invention, a spiral block is provided on the outer surface of the driving shaft, and a push block is provided on the outer surface of the driving shaft and on one side of the spiral block.

[0017] As a further optimization scheme of the present invention, a connecting block is provided at the lower end of the inner cavity of the base, an adjusting plate is rotatably mounted on the upper end of the connecting block, and one end of the adjusting plate is fitted with the outer surface of the pushing block.

[0018] As a further optimization scheme of the present invention, a guide cylinder is provided at the upper end of the base, and a telescopic rod is slidably installed on the inner wall of the guide cylinder. The lower end of the telescopic rod passes through and extends to the lower end of the base, and the lower end of the telescopic rod is fitted with the end of the adjustment plate.

[0019] As a further optimization scheme of the present invention, a turntable is rotatably installed at the upper end of the inner cavity of the base, and multiple groups of protrusions are arranged at the lower end of the turntable, and the multiple groups of protrusions are evenly distributed at the lower end of the turntable, and the outer surface of the spiral block is meshed with the outer surface of the protrusion.

[0020] As a further optimization solution of the present invention, a limit block is arranged at the upper end of the turntable, the upper end of the limit block penetrates and extends to the upper end of the base, and a placement plate is arranged at the upper end of the limit block.

[0021] As a further optimization scheme of the present invention, an extension rod is arranged in the middle position of the upper end of the placement plate, the outer surface of the extension rod is slidably connected to the end of the ring away from the sleeve, the upper end of the telescopic rod is connected to the lower end of the movable block, and the upper end of the guide cylinder is connected to the lower end of the limit column.

[0022] Compared with the prior art, the feeding device of a bearing end face grinder provided by the present invention has the following beneficial effects: when the adjusting plate rotates around the connecting block, the end away from the pushing block is driven to move upward or downward, pushing the telescopic rod to move up and down. Since the outer surface of the telescopic rod is slidably connected to the inner wall of the guide cylinder, the telescopic rod is ensured to remain stable as a whole when moving, thereby avoiding the telescopic rod from shifting when moving, thereby causing the bearing placement position to deviate; at the same time, when the telescopic rod moves, the lower end of the movable block connected to its upper end is driven to connect, thereby providing power to the pushing assembly when the telescopic rod moves, and the upper end of the guide cylinder is connected to the lower end of the limit column, so that the pushing assembly is stably located at the upper end of the guide cylinder, avoiding it from falling off during transportation.

[0023] When the adjusting rod rotates, the rotating block arranged at its end is synchronously driven to rotate, and at the same time, the movable groove provided on the inner wall of the sleeve is slidably connected with the outer surface of the rotating block, and the entire sleeve rotates with the rotating block. The upper end of the rotating block fits with the lower end of the storage barrel, so that when the rotating block rotates, it is separated from the lower end of the storage barrel, so that the bearing inside it falls down, and after the bearing falls down, the rotating block returns to the initial position, and then the bearing inside the storage barrel is separated again, so that it falls evenly, so that it is accurately placed in the working position of the grinder, and at the same time, the processing accuracy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 A first schematic diagram of the overall structure provided by an embodiment of the present invention;

[0026] Figure 2 A first schematic diagram of the overall structure provided by an embodiment of the present invention;

[0027] Figure 3 A cross-sectional view of the overall internal structure provided by an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of the push component structure provided by an embodiment of the present invention;

[0029] Figure 5 A cross-sectional view of the internal structure of a pushing component provided in an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of a portion of the structure of a push component provided in an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of the protective tube structure provided by an embodiment of the present invention;

[0032] Figure 8 A cross-sectional view of the internal structure of the protective tube provided in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Base; 2. Transmission component; 3. Pushing component; 11. Operating table; 21. Driving member; 22. Support rod; 221. Driving shaft; 23. Screw block; 24. Pushing block; 25. Adjusting plate; 26. Connecting block; 27. Telescopic rod; 271. Guide cylinder; 28. Turntable; 281. Bump; 29. ​​Limiting block; 291. Placing plate; 292. Extension rod; 31. Movable block; 311. Positioning rod; 32. Limiting column; 33. Adjusting rod; 331. Annular groove; 332. Positioning block; 34. Rotating cylinder; 341. Slide groove; 35. Protective cylinder; 351. Fixed block; 36. Baffle; 37. Rotating block; 38. Sleeve; 381. Movable groove; 382. Through hole; 383. Conveying pipe; 384. Ring; 39. Storage cylinder. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and 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 limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Example: See Figure 1-Figure 8 A feeding device for a bearing end surface grinder comprises a base 1, an operating table 11 is arranged at the upper end of the base 1, and a transmission component 2 is arranged in the inner cavity of the base 1 and below the operating table 11, and the bearing is transported through the transmission component 2.

[0038] In this solution, a grinding device is provided at the upper end of the operating table 11 for grinding the bearings on the transmission component 2, and after the grinding is completed, it is directly transmitted to the next step.

[0039] Furthermore, the pushing component 3 is assembled on the upper end of the base 1 and is used to accurately place the bearing on the transmission component 2; wherein the pushing component 3 includes a movable block 31, a limiting column 32 is provided on the outer surface of the movable block 31, an adjusting rod 33 is slidably installed inside the limiting column 32, an annular groove 331 is provided at the lower end of the outer surface of the adjusting rod 33, and a positioning rod 311 is provided at one end of the movable block 31, and the outer surface of the positioning rod 311 is slidably connected to the inner wall of the annular groove 331.

[0040] In this embodiment, when the movable block 31 moves, the positioning rod 311 arranged at its end is synchronously driven to move. Since the outer surface of the positioning rod 311 is slidingly connected to the inner wall of the annular groove 331, when the movable block 31 moves, the adjusting rod 33 is driven to move, and the adjusting rod 33 is limited by the limiting column 32, so that the whole remains stable when the adjusting rod 33 moves.

[0041] Furthermore, a positioning block 332 is provided on the outer surface of the adjusting rod 33, and a rotating cylinder 34 is slidably installed on the outer surfaces of the adjusting rod 33 and the positioning block 332, and a sliding groove 341 is opened on the outer surface of the rotating cylinder 34; a protective cylinder 35 is provided on the upper end of the limiting column 32, and a fixed block 351 is provided on the inner wall of the protective cylinder 35, and the outer surface of the fixed block 351 is slidably connected to the inner wall of the sliding groove 341.

[0042] Specifically, a clamping groove is provided on the inner wall of the rotating drum 34 , wherein the inner wall of the clamping groove is slidably connected to the outer surface of the positioning block 332 , so that when the rotating drum 34 rotates, the adjusting rod 33 can be driven to rotate synchronously.

[0043] At the same time, the inner cavity of the protective cylinder 35 is provided with a fixed block 351, and the outer surface of the fixed block 351 is slidably connected to the inner wall of the slide groove 341. At the same time, the lower end of the protective cylinder 35 is connected to the upper end of the limit column 32, so that when the adjusting rod 33 moves upward, the rotating cylinder 34 is synchronously driven to move, so as to cooperate with the fixed block 351 to make the rotating cylinder 34 rotate, and synchronously drive the adjusting rod 33 to rotate.

[0044] Furthermore, a baffle 36 is provided at the upper end of the rotating drum 34, a rotating block 37 is provided at the upper end of the adjusting rod 33, a sleeve 38 is provided above the baffle 36, a movable groove 381 is provided on the inner wall of the sleeve 38, the upper end of the rotating block 37 passes through and extends to the inner cavity of the sleeve 38, and the outer surface of the rotating block 37 is slidably connected to the inner wall of the movable groove 381; a material storage barrel 39 is provided in the inner cavity of the sleeve 38, and the lower end of the material storage barrel 39 is in contact with the upper end of the rotating block 37.

[0045] Specifically, when the adjusting rod 33 rotates, the rotating block 37 arranged at its end is synchronously driven to rotate. At the same time, the movable groove 381 provided on the inner wall of the sleeve 38 is slidably connected with the outer surface of the rotating block 37, and the entire sleeve 38 rotates following the rotating block 37.

[0046] The upper end of the rotating block 37 fits with the lower end of the storage barrel 39, so that when the rotating block 37 rotates, it is separated from the lower end of the storage barrel 39, so that the bearing inside it falls, and after the bearing falls, the rotating block 37 returns to its initial position, and then the bearing inside the storage barrel 39 is isolated again, so that it falls evenly.

[0047] Furthermore, a through hole 382 is formed at the lower end of the sleeve 38, and a delivery pipe 383 is provided on the inner wall of the through hole 382. A collar 384 is sleeved on the outer surface of the sleeve 38.

[0048] Specifically, when the bearing falls, it passes through the through hole 382 and the interior of the conveying tube 383, and is transported to a designated position through the conveying tube 383, so as to facilitate subsequent processing.

[0049] Furthermore, the transmission component 2 includes a driving member 21 connected to the base 1, a driving shaft 221 is provided at the end of the driving member 21, a plurality of support rods 22 are provided on the outer surface of the driving shaft 221, and the plurality of support rods 22 are evenly distributed on the outer surface of the driving shaft 221, and the lower end of the support rod 22 is connected to the base 1.

[0050] In this embodiment, the driving member 21 is a device with power output such as a motor, and is connected to an external control device. When the driving member 21 is started, it synchronously drives the driving shaft 221 arranged at its output end to rotate, and cooperates with multiple groups of support rods 22 to support the driving shaft 221, so that the driving shaft 221 remains stable as a whole when rotating.

[0051] Furthermore, a spiral block 23 is provided on the outer surface of the driving shaft 221, and a push block 24 is provided on the outer surface of the driving shaft 221 and on one side of the spiral block 23. A connecting block 26 is provided at the lower end of the inner cavity of the base 1, and an adjusting plate 25 is rotatably mounted on the upper end of the connecting block 26, and one end of the adjusting plate 25 is in contact with the outer surface of the push block 24.

[0052] Specifically, when the driving shaft 221 rotates, the push block 24 disposed on the outer surface thereof is synchronously driven to rotate. The cross section of the push block 24 is elliptical, so that when the push block 24 rotates, the adjustment plate 25 is pushed to rotate around the connecting block 26.

[0053] Furthermore, a guide cylinder 271 is provided at the upper end of the base 1 , and a telescopic rod 27 is slidably installed on the inner wall of the guide cylinder 271 . The lower end of the telescopic rod 27 passes through and extends to the lower end of the base 1 , and the lower end of the telescopic rod 27 is in contact with the end of the adjustment plate 25 .

[0054] Specifically, when the adjustment plate 25 rotates around the connecting block 26, the end away from the push block 24 is driven to move upward or downward, thereby pushing the telescopic rod 27 to move up and down. At the same time, the outer surface of the telescopic rod 27 is slidably connected to the inner wall of the guide cylinder 271, thereby ensuring that the telescopic rod 27 remains stable as a whole when moving, avoiding the telescopic rod 27 from shifting when moving, thereby causing a deviation in the bearing placement position.

[0055] Furthermore, a turntable 28 is rotatably mounted at the upper end of the inner cavity of the base 1 , and a plurality of groups of protrusions 281 are arranged at the lower end of the turntable 28 , and the plurality of groups of protrusions 281 are evenly distributed at the lower end of the turntable 28 , and the outer surface of the spiral block 23 is meshed with the outer surface of the protrusion 281 .

[0056] Specifically, when the spiral block 23 mounted on the driving shaft 221 rotates, the protrusion 281 at the lower end of the turntable 28 meshes with the spiral block 23, thereby driving the turntable 28 engaged on the spiral block 23 to rotate.

[0057] Furthermore, a limiting block 29 is disposed at the upper end of the turntable 28 , and the upper end of the limiting block 29 penetrates and extends to the upper end of the base 1 , and a placing plate 291 is disposed at the upper end of the limiting block 29 .

[0058] Specifically, the turntable 28 is fixed by the limit block 29 so that the turntable 28 is stably located in the inner cavity of the base 1. At the same time, when the turntable 28 rotates, the placement plate 291 is synchronously driven to rotate, wherein a plurality of groups of grooves are provided on the upper end of the placement plate 291, and the outer surface of the grooves is connected to the outside, so that the polished bearings can be extracted synchronously.

[0059] Furthermore, an extension rod 292 is provided in the middle position of the upper end of the placement plate 291, and the outer surface of the extension rod 292 is slidably connected to the end of the ring 384 away from the sleeve 38, the upper end of the telescopic rod 27 is connected to the lower end of the movable block 31, and the upper end of the guide cylinder 271 is connected to the lower end of the limit column 32.

[0060] Specifically, since the inner wall of the collar 384 is provided with a docking block, the outer surface of the sleeve 38 is provided with a positioning groove, and the outer surface of the docking block is slidably connected to the inner wall of the docking groove, the sleeve 38 remains stable when the adjustment rod 33 rotates.

[0061] When the telescopic rod 27 moves, it drives the lower end of the movable block 31 connected to its upper end to connect, so that when the telescopic rod 27 moves, it can provide power for the pushing assembly 3, and the upper end of the guide cylinder 271 is connected to the lower end of the limiting column 32, so that the pushing assembly 3 is stably located at the upper end of the guide cylinder 271.

[0062] The control device can select a single-chip microcomputer as the control end. In this embodiment, the single-chip microcomputer is a typical embedded microcontroller (Micro controller unit), which is composed of an arithmetic unit, a controller, a memory, an input and output device, etc., which is equivalent to a microcomputer. Compared with the general-purpose microprocessor used in personal computers, it emphasizes self-supply (no external hardware) and cost saving. Its biggest advantage is that it is small in size and can be placed inside the instrument, but it has a small storage capacity, a simple input and output interface, and low functional consumption.

[0063] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A feeding device for a bearing end surface grinder, characterized in that: It comprises a base (1), an operating table (11) is arranged at the upper end of the base (1), and a transmission component (2) is arranged in the inner cavity of the base (1) and below the operating table (11), and the bearing is transported through the transmission component (2); A pushing assembly (3), which is assembled on the upper end of the base (1) and is used to accurately place the bearing on the transmission assembly (2); The pushing assembly (3) comprises a movable block (31), a limiting column (32) is arranged on the outer surface of the movable block (31), an adjusting rod (33) is slidably mounted inside the limiting column (32), an annular groove (331) is provided at the lower end of the outer surface of the adjusting rod (33), and a positioning rod (311) is arranged at one end of the movable block (31), and the outer surface of the positioning rod (311) is slidably connected to the inner wall of the annular groove (331); A positioning block (332) is provided on the outer surface of the adjusting rod (33), and a rotating drum (34) is slidably mounted on the outer surfaces of the adjusting rod (33) and the positioning block (332), and a sliding groove (341) is provided on the outer surface of the rotating drum (34); A protective tube (35) is provided at the upper end of the limiting column (32), a fixing block (351) is provided on the inner wall of the protective tube (35), and an outer surface of the fixing block (351) is slidably connected to the inner wall of the sliding groove (341); A baffle (36) is provided at the upper end of the rotating cylinder (34), a rotating block (37) is provided at the upper end of the adjusting rod (33), a sleeve (38) is provided above the baffle (36), an inner wall of the sleeve (38) is provided with a movable groove (381), the upper end of the rotating block (37) penetrates and extends to the inner cavity of the sleeve (38), and the outer surface of the rotating block (37) is slidably connected to the inner wall of the movable groove (381); The inner cavity of the sleeve (38) is provided with a material storage barrel (39), and the lower end of the material storage barrel (39) is in contact with the upper end of the rotating block (37); The outer surface of the sleeve (38) is sleeved with a collar (384); The transmission component (2) comprises a driving member (21) connected to the base (1), a driving shaft (221) being provided at the end of the driving member (21), a plurality of groups of support rods (22) being provided on the outer surface of the driving shaft (221), and the plurality of groups of support rods (22) being evenly distributed on the outer surface of the driving shaft (221), and the lower ends of the support rods (22) being connected to the base (1); A spiral block (23) is provided on the outer surface of the driving shaft (221), and a push block (24) is provided on the outer surface of the driving shaft (221) and located on one side of the spiral block (23); A connecting block (26) is provided at the lower end of the inner cavity of the base (1), an adjusting plate (25) is rotatably mounted on the upper end of the connecting block (26), and one end of the adjusting plate (25) is in contact with the outer surface of the pushing block (24); A guide cylinder (271) is provided at the upper end of the base (1), a telescopic rod (27) is slidably mounted on the inner wall of the guide cylinder (271), the lower end of the telescopic rod (27) passes through and extends to the lower end of the base (1), and the lower end of the telescopic rod (27) is in contact with the end of the adjustment plate (25).

2. A feeding device for a bearing end surface grinder according to claim 1, characterized in that: A through hole (382) is provided at the lower end of the sleeve (38), and a delivery pipe (383) is provided on the inner wall of the through hole (382).

3. The feeding device of a bearing end surface grinder according to claim 1, characterized in that: A turntable (28) is rotatably mounted on the upper end of the inner cavity of the base (1), and a plurality of groups of protrusions (281) are arranged on the lower end of the turntable (28). The plurality of groups of protrusions (281) are evenly distributed on the lower end of the turntable (28), and the outer surface of the spiral block (23) is meshed with the outer surface of the protrusion (281).

4. A feeding device for a bearing end surface grinder according to claim 3, characterized in that: A limit block (29) is provided at the upper end of the rotating disk (28), the upper end of the limit block (29) penetrates and extends to the upper end of the base (1), and a placement plate (291) is provided at the upper end of the limit block (29).

5. The feeding device of the bearing end surface grinding machine according to claim 4, characterized in that: An extension rod (292) is provided at the middle position of the upper end of the placement plate (291), and the outer surface of the extension rod (292) is slidably connected to the end of the ring (384) away from the sleeve (38), the upper end of the telescopic rod (27) is connected to the lower end of the movable block (31), and the upper end of the guide cylinder (271) is connected to the lower end of the limiting column (32).

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