CN215470468U - Adjustable fixture - Google Patents

Abstract

The utility model relates to the field of preparation of metal and alloy metallographic specimens thereof, in particular to an adjustable clamp. An adjustable clamp comprises a force application rod 1, a force application shaft 2, a sample clamp guide rail 3, a connecting key 4, a sample clamp 5, a right-angle connecting rod 6, a spring A7, a disc 8, a base 9 and a bottom plate 10. The whole adjustable clamp has simple structural design and easy manufacture, can meet the grinding and polishing processing of metallographic samples with general shapes, can also meet the grinding and polishing of metallographic samples with different thickness sizes and different height welding lines, and achieves multiple purposes; the grinding and polishing direction and the grinding and polishing position can be changed and adjusted under the condition that the metallographic specimen is not changed; the force application size can be flexibly adjusted according to the grinding and polishing degree of the sample; and meanwhile, 4 metallographic samples are supported for grinding and polishing work, so that the grinding and polishing efficiency can be effectively improved, and the grinding and polishing time is greatly reduced.

Description

Adjustable fixture

Technical Field

The utility model belongs to the field of preparation of metal and alloy metallographic specimens thereof, and particularly relates to an adjustable clamp.

Background

After heat treatment is carried out on metal and alloy materials thereof or in the process of developing new materials, the influence of the process on the mechanical properties of the materials needs to be researched through corresponding experiments, and a metallographic experiment is an essential experiment. Before a metallographic microstructure observation experiment is carried out, a metallographic sample needs to be ground, polished and corroded, and then the sample can be placed under a microscope to observe a metal structure. The common metallographic specimen preparation process comprises the steps of coarse grinding, fine grinding, coarse polishing, fine polishing, corrosion and the like, and the quality of grinding and polishing determines the corrosion effect, so that the observation of a metal structure is influenced. At present, a sample is generally ground and polished by manually holding the sample in hand in the grinding and polishing work, and a large amount of manpower and material resources and a large amount of time are consumed in the process; and the standard metallographic specimen is generally small in size, and the rotating speed of the grinding and polishing machine is relatively high, so that the specimen is easy to fly out, and unnecessary safety accidents are caused. In addition, a large amount of sample materials are usually required to be observed in the metallographic experiment process to obtain a corresponding conclusion, and the single sample is simply held by hands to be ground and polished, so that the efficiency is low and the time consumption is increased; and due to human instability factors, the polished metallographic specimen has the phenomena of different heights, uneven flatness and partial specimen plane grinding deviation, so that the subsequent metallographic structure observation is inconvenient, and the observation quality is influenced. Although an automatic grinding and polishing machine is available in the market at present, the automatic grinding and polishing machine is expensive, and the applied force in the grinding and polishing process is generally fixed and cannot be automatically adjusted according to the current grinding and polishing situation, so that the grinding and polishing effect of a sample is influenced.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to an adjustable clamp to solve the above problems in the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme: an adjustable clamp comprises a force application rod 1, a force application shaft 2, a sample clamp guide rail 3, a connecting key 4, a sample clamp 5, a right-angle connecting rod 6, a spring A7, a disc 8, a base 9 and a bottom plate 10. The force application rod 1 is provided with 2M 6 threaded holes 11 and is connected with the right-angle connecting rod 6 and the base 9 through bolts; the handle 13 is designed to have a size according to the ergonomic principle and is provided with anti-skid lines; in order to reduce the weight of the whole device, the handle 12 is made of high-strength light aluminum alloy material.

Furthermore, 2M 4 threaded holes 31 are processed on both sides of the sample clamp guide rail 3 and are connected with the disc 8 through bolts; the groove features 32 with equal size and equal spacing are processed and matched with the features 412 of the key 41 to play a role in positioning and fixing; the guide rail inclined sliding groove 33 is mainly matched with the inclined sliding groove 423 of the connecting block 42 to play a role in connection and guidance; the opening feature 34 cooperates with the flat groove 422 of the connector block 42 for guidance.

Further, the connection key 4 is composed of a key 41, a connection block 42, a connection shaft 43 and a spring B44. The size of the characteristic 412 of the key 41 is equal to that of the groove of the sample clamp guide rail 3, and the positioning and fixing functions are realized; the fillet feature 411 is mainly to avoid stress concentration of the key; the key is provided with 2 through holes 413 which are connected with the connecting block 42 through a connecting shaft 43; the anti-slip pattern 414 is processed at the position where the key 42 applies force to press, so as to increase the friction force. 2M 4 threaded holes 425 are processed at the bottom of the connecting block 42 and are connected with the upper cover plate of the sample clamp 5 by bolts; the inclined sliding groove 423 is combined with the inclined sliding groove characteristic of the sample guide rail to play a role in connection and guidance; the flat slot 422 mates with the open feature of the disk 8; a through hole 421 is processed and connected with the key 41 through a connecting shaft 43; to reduce the weight of the connector block, a through hole 424 is formed. The spring B44 is a standard spring, one end of the spring is stretched to extend below the anti-slip pattern 414 of the key 41, and the spring is nested inside the connecting shaft 43; both ends of the connecting shaft 43 penetrate through the through holes of the keys and the connecting block.

Further, the sample clamp 5 adopts a modular combination design concept, the fixed clamp body 53, the movable clamp body 54 and the knob 57 form a lower module, and the bolt 51, the sleeve 52, the upper cover plate 55, the nut 56, the spring C58, the small shaft 59 and the nut 60 form an upper module. The fixed clamp body 53 is provided with a groove 535, so that the preparation of a metallographic sample of a welding seam can be assisted, and the grinding and polishing of the metallographic sample with a general shape and the grinding and polishing of the metallographic sample with a special shape can be assisted; simultaneously, a threaded hole and an inclined sliding groove are machined so as to be connected and combined with the movable clamp body 54, 4 positioning round holes 533 and 2 small protruding shafts 534 are machined in a circular truncated cone 531 on the base body of the fixed clamp body, and the circular truncated cone can be connected with the base body in a welding mode. The movable clamp body 6 is provided with a threaded hole 542 and an inclined sliding groove 541, and the distance between the two clamp bodies is adjusted by using a set screw nested in the knob 5. Through the design, the clamping of the sample can be realized, meanwhile, the clamp can also adapt to metallographic samples with different thicknesses, the clamp is prevented from being repeatedly designed, and the cost for replacing the product is greatly reduced.

Furthermore, 4 auxiliary clamping positioning grooves 523 with 90-degree intervals are processed at the bottom of the upper module sleeve 52 so as to be clamped and positioned with the small convex shaft 534 of the lower module, and meanwhile, the grinding and polishing direction of a metallographic sample can be changed under the condition that the metallographic sample is not detached and moved, so that human errors are avoided; two threaded holes 521 are processed at the upper part of the sleeve so as to be connected with the upper cover plate through cylindrical head screws 51; 4 round platform ladder through-holes 522 are processed to the inside processing of sleeve, adopt light aluminum alloy material processing preparation, realize the lightweight. The small shaft 59 is made of aluminum alloy materials, is machined into a stepped shaft form through a machining mode, one end of the small shaft is provided with threads, the spring C58 is embedded in the small shaft 59 and fixed inside the sleeve 52 through a hexagonal nut, the small shaft can only move up and down for a certain distance, the left and right swinging of the small shaft is limited, and the spring C58 and the hexagonal nut 60 are both standard parts.

Furthermore, the disc 8 is provided with 4 rectangular openings with equal size and equal spacing, and two sides of the disc are respectively provided with 2 threaded holes 81 of M4, and the disc is mainly used for fixing the guide rail 3; an inner groove 82 is formed at the bottom of the disc, so that the sample clamp 5 can move along the guide rail 3 conveniently; a concave hole and a threaded hole 83 are formed in the center of the disc 8 and are connected and fixed to the force application shaft 2 by bolts.

Further, the base 9 is processed with 2 small through holes 91 to place the force application shaft 2; a large through hole 92 is formed between the two small through holes, so that the spring A7 can be conveniently placed, and the weight of the device is reduced; a small bump is arranged on the side edge of the base, an M6 threaded hole 93 is processed on the bump, the bump is connected with the force application rod 1 through a bolt, and the small bump can be connected with the base through the bolt or a welding mode; the cuboid structure at the lower part of the base is a hollow structure, and a cylinder inscribed in the cuboid is arranged in the cuboid hollow structure, so that the supporting strength of the bottom of the base can be ensured, and the weight of the whole device can be reduced.

Compared with the prior art, the utility model has the beneficial effects that: the adjustable clamp can change the grinding and polishing directions of a metallographic sample under the condition that the metallographic sample is not detached and moved, so that artificial errors are avoided; the distance between the metallographic specimen and the center of the grinding and polishing machine can be adjusted by the action of the specimen clamp guide rail 3, so that the sand paper and the polishing cloth can be fully utilized; compared with the prior automatic grinding and polishing machine which applies fixed pressure, the device can apply certain pressure to the metallographic specimen through the action of the force application rod 1, the force application shaft 2 and the spring A7, and can also artificially and flexibly adjust the applied pressure according to the grinding and polishing degree so as to improve the grinding and polishing effect of the specimen; the adjustable fixture can simultaneously polish or polish 4 metallographic samples, greatly improves the polishing efficiency and saves the experimental time; the utility model provides a specimen holder 5 of anchor clamps with adjustable can be suitable for the general metallographic specimen on both ends plane, also can be applicable to the welding seam metallographic specimen to interval between the two anchor clamps bodies is adjustable, thereby can be applicable to the metallographic specimen of different thickness sizes, has enlarged adjustable fixture device's application scope, accomplishes one and has many purposes, reduction in production cost.

The bolt, the thread, the nut and the spring used by the adjustable clamp all adopt uniform standard parts; the whole adjustable clamp device adopts a modularized and serialized design. The sample clamp 5 consists of an upper module and a lower module, the lower module consists of a fixed clamp body 53, a movable clamp body 54 and a knob 57, and the lower module is mainly used for clamping metallographic samples with different shapes and different thicknesses; the upper module mainly comprises a screw 51, a sleeve 52, an upper cover plate 55, a nut 56, a spring C58, a small shaft 59, a nut 60 and the like, and mainly has the function of changing the grinding and polishing direction of a sample under the condition of no disassembly; the upper module and the lower module are positioned and connected through the clamping groove. The sample clamp guide rail 3 and the connecting key 4 form a module, and the module mainly plays a role in adjusting the distance between the metallographic sample and the center of the grinding and polishing machine. The force application rod 1, the force application shaft 2, the spring A7 and the like form a force application mechanism, and the force application mechanism has the main functions of flexibly adjusting applied pressure according to the grinding and polishing degree of a sample in the grinding and polishing process and ensuring the grinding and polishing effect of the sample. The base 9 and the bottom plate 10 form a fixed module, which mainly plays a bearing role.

An adjustable clamp is made of a high-strength light alloy material, a lightweight structural design conforming to ergonomics is carried out, parts are designed in a hole system positioning mode and a clamping groove positioning auxiliary mode, a metallographic sample can be kept in a stable state in the grinding and polishing process, and errors caused by shaking are avoided; the force application mechanism which is adjustable is designed, so that the applied pressure can be adjusted in time according to the grinding and polishing degree of the sample in the grinding and polishing process, and the grinding and polishing effect is ensured. The adjustable clamp is simple in structural design, convenient to assemble and disassemble, easy to machine and manufacture all parts, and capable of meeting the requirements of medium and small-batch production.

Drawings

FIG. 1 is a view of the overall structure of an adjustable fixture according to the present invention;

FIG. 2 is a structural diagram of a force application rod of an adjustable fixture according to the present invention;

FIG. 3 is a structural diagram of a force application shaft of an adjustable fixture according to the present invention;

FIG. 4 is a structural diagram of a sample holder guide rail of an adjustable holder according to the present invention;

FIG. 5 is a schematic view of a connection button and a part of a structure thereof of an adjustable fixture according to the present invention;

FIG. 6 is a schematic diagram of a sample holder and a part of the structure thereof;

FIG. 7 is a right angle type connecting rod structure of an adjustable clamp according to the present invention;

FIG. 8 is a diagram of a spring structure of an adjustable clamp according to the present invention;

FIG. 9 is a diagram of a disk structure of an adjustable fixture according to the present invention;

FIG. 10 is a schematic diagram of a base and a bottom plate of an adjustable fixture according to the present invention;

the reference symbols: 1-force application rod, 11-M6 threaded hole, 12-handle rod and 13-handle; 2-force application shaft, 21-M6 threaded hole; 3-sample clamp guide rail, 31-M4 threaded hole, 32-positioning clamping groove, 33-plane groove and 34-inclined sliding groove; 4-connecting a key, 41-a key, 42-a connecting block, 43-a small shaft, 44-a spring B, 411-a rounding characteristic, 412-a key clamping and positioning characteristic, 413-a connecting hole, 414-an anti-slip pattern, 421-a connecting hole, 422-a flat groove, 423-an inclined sliding groove, 424-a through hole and 425-M4 threaded holes; 5-a sample clamp, 51-a bolt, 52-a sleeve, 53-a fixed clamp body, 54-a movable clamp body, 55-an upper cover plate, 56-a thread, 57-a knob, 58-a spring C, 59-a small stepped shaft, 60-a nut, 521-M4 threaded holes, 522-a stepped through hole, 523-a clamping positioning groove, 524-a concave hole groove, 531-a circular truncated cone, 532-an inclined sliding groove, 533-a positioning hole, 534-a small convex shaft, 535-a groove, 541-an inclined sliding groove, 542-M4 threaded holes and 551-M4 threaded holes; the 6-right-angle connecting rod is provided with 61-M6 threaded holes and 61-M6 threaded holes; 7-spring A; 8-disc, 81-M4 threaded hole, 82-flat groove, 83-M6 threaded hole; 9-base, 91-round hole, 92-through slotted hole, 93-M6 threaded hole and 10-bottom plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Please refer to the attached fig. 1: the adjustable clamp comprises a force application rod 1, a force application shaft 2, a sample clamp guide rail 3, a connecting key 4, a sample clamp 5, a right-angle connecting rod 6, a spring A7, a disc 8, a base 9 and a bottom plate 10.

Please refer to fig. 2: the force application rod 1 is provided with two M6 threaded holes, is respectively connected with the base 9 and the right-angle connecting rod 6 through bolts, and is provided with anti-skid lines at the handle; the whole force application rod is made of high-strength light alloy materials, and meets the general requirements of ergonomic design.

Please refer to fig. 3: the force application shaft 2 is in a stepped shaft form, two threaded holes M6 are formed in two end faces of the force application shaft, the force application shaft is connected with the right-angle connecting rod 6 and the disc 8 through bolts, and the spring is nested in the force application shaft 2 and mainly plays a role in transferring force in the grinding and polishing process.

Please refer to fig. 4: two threaded holes 31 of M4 are respectively processed on two sides of the sample clamp guide rail 3 and are connected and fixed with the disc through bolts; the guide rail is provided with a clamping positioning groove 32, a flat groove 33 and an inclined sliding groove 34 which are connected and matched with the connecting key 4. The screw hole and groove features on the guide rail can be manufactured by milling and machining; the whole sample guide rail is made of high-strength light aluminum alloy materials, and lightweight design is achieved.

Please refer to fig. 5: the connecting button 4 consists of a button 41, a connecting block 42, a small shaft 43 and a spring B44. The key 41 is provided with anti-skid grains 414 and a round hole 413 for light weight design; a round hole 421, a threaded hole 425, a flat groove 422 and an inclined sliding groove 423 are processed on the connecting block 42, and a through hole characteristic 424 is designed for reducing the weight of the connecting block; the small shaft 43 connects the key 41 and the connecting block 42 together, the spring is nested in the small shaft, and is matched with the sample guide rail 3 through the groove characteristic of the connecting block, and the connecting key and the sample clamp are combined together by using a bolt. When the distance between the metallographic specimen and the center of the grinding and polishing machine needs to be adjusted, the sliding-proof line end of the key is pressed first, the key can be freely moved and connected to adjust the position, and the rear part feature 412 of the key is locked with the guide rail clamping positioning groove 32 after the key is loosened, so that the shaking phenomenon is avoided.

Please refer to fig. 6 of the specification: the sample clamp 5 consists of a bolt 51, a sleeve 52, a fixed clamp body 53, a movable clamp body 54, an upper cover plate 55, a thread 56, a knob 57, a spring C58, a small shaft 59 and a nut 60. The lower module adjusts the distance between the two clamp bodies through a knob 57 so as to adapt to metallographic samples with different thicknesses; one side of the fixed clamp body 53 is provided with a groove, and elastic plastic is used for adapting to weld metallographic samples with different heights, so that the function of the device for assisting in grinding and polishing metallographic samples with different shapes can be met; the upper module can change the sample polishing direction under the condition of no disassembly, thereby avoiding human errors. The upper and lower modules are integrally connected through the mutual combination of the small convex shaft 534 and the auxiliary clamping positioning groove 523. The round platform of the lower module fixing clamp body 53 upwards compresses the spring and then twists by a certain angle, so that the small protruding shaft is embedded into the clamping positioning groove of the sleeve 8, and the connection of the upper module and the lower module is realized.

Please refer to fig. 7: the right-angle connecting rod 6 is made of high-strength light aluminum alloy, obtains a basic shape through a stamping process, is provided with two threaded through holes in a machining mode on the side, and is connected with the force application rod 1 and the force application shaft 2 through bolts to play a role in transferring force.

Please refer to fig. 8: the spring A7 adopts the standard component, and the material is made for high strength carbon steel material, nests in application of force axle 2 inside, mainly utilizes the spring atress compression, and the principle that resets after loosening plays the effect of buffer force.

Please refer to fig. 9 of the specification: the disc 8 is provided with 4 equally-spaced and equally-sized notches, two threaded holes M4 are respectively formed in two sides of each notch, and the sample guide rail 3 is fixedly connected with the disc through bolts; grooves are processed below the 4 grooving openings, so that the sample clamp 5 can conveniently move and adjust the position along with the connecting key 4.

Please refer to fig. 10: base 9 and bottom plate 10 accessible welding or bolt combination of connecting, the below cuboid stand part of base 9 sets up to hollow structure to set up in this cuboid hollow structure with the drum of cuboid inscription, so both can guarantee the support intensity of base bottom, can alleviate the weight of whole device again. A small bump is arranged on the side edge of the base 9, an M6 threaded hole 93 is processed on the bump, the bump is connected with the force application rod 1 through a bolt, and the small bump can be connected with the base through a bolt or a welding mode; the base 9 is provided with two through holes 91 for conveniently placing the force application shaft 2, and a through hole 92 for placing a spring.

The adjustable clamp disclosed by the embodiment adopts a standardized and modularized design, and can be used for adjusting the distance between two clamp bodies by using the knob 57 and assisting elastic plastics according to a processing object in the fixed clamp body groove 535 of the sample clamp 5, so that the adjustable clamp can be suitable for metallographic samples with different thicknesses and metallographic samples with different weld joint heights, and is multipurpose; meanwhile, the grinding and polishing direction is changed under the condition that the metallographic specimen is not disassembled and changed by the interaction of the small convex shaft and the 4 clamping positioning grooves, and human errors are avoided. Through the effect of connecting button 4, can freely adjust the distance of metallographic specimen and polish machine center on sample anchor clamps guide rail 3 to make full use of abrasive paper and polishing cloth.

Through the force application module that application of force pole 1, application of force axle 2, spring A7 etc. constitute, can make things convenient for the user of service to in time adjust the application of force according to the sample degree of polishing, improve and polish the effect. The device can process 4 metallographic specimens simultaneously, improves greatly and grinds the efficiency of throwing. An adjustable clamp method of use and principles are described above. Through designing locating hole, chucking constant head tank and spout, realize the location and the connection of each part of anchor clamps.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. An adjustable clamp is characterized in that: including application of force pole (1), application of force axle (2), sample anchor clamps guide rail (3), connection button (4), sample anchor clamps (5), right angle type connecting rod (6), spring A (7), disc (8), base (9), bottom plate (10), application of force pole (1) processing have two M6's screw hole for be connected with right angle type connecting rod (6) and base (9), the one end of application of force pole is connected with the handle, processing has anti-skidding line on the handle.

2. The adjustable clamp of claim 1, wherein: the force application shaft (2) is processed into a stepped shaft form, M6 threaded holes (21) are processed at two ends of the force application shaft and are respectively connected and fixed with the right-angle connecting rod (6) and the disc (8), and the spring A (7) is embedded inside the force application shaft (2).

3. The adjustable clamp of claim 1, wherein: two threaded holes (31) of M4 are processed on both sides of the sample clamp guide rail (3), and are connected and fixed with the disc (8) through bolts; the two sides of the sample clamp are also provided with equally-spaced and equally-sized grooves (535) for positioning and clamping the sample clamp (5), the bottom of the sample clamp is provided with an inclined chute (532) characteristic for connecting and moving the connecting key (4) so as to adjust the distance between a metallographic sample and the center of the grinding and polishing machine, and the middle of the sample clamp guide rail (3) is provided with a notch for placing the connecting key (4).

4. The adjustable fixture according to claim 1, wherein the connecting button (4) is composed of a connecting block (42), a slot positioning key, a spring B (44) and a small shaft (43), the connecting block (42) and the slot positioning key are positioned through holes and connected through a shaft, the spring is nested inside the small shaft, M4 threaded holes are formed in two sides of the connecting block and connected with the sample fixture (5) through bolts, the connecting block (42) is provided with an inclined chute and a flat chute, the inclined chute is mainly matched with a sample fixture guide rail (3), and the flat chute is connected with an opening of the guide rail to play a role in guiding and supporting; the thickness and the length of the tail part characteristics of the clamping groove positioning key are consistent with the size of the guide rail groove, anti-skid lines are processed at the front force application position, the front part is pressed under stress, the rear part of the clamping groove positioning key is tilted under the action of a spring B (44), the whole sample clamp (5) can slide at the moment, the position of the whole sample clamp and the grinding and polishing center is adjusted, after the pressure is released, the spring resets, and the clamping groove positioning key is matched with the guide rail groove to realize positioning and clamping.

5. The adjustable clamp of claim 1, wherein: the test sample clamp (5) mainly comprises an upper cover plate (55), a sleeve (52), a fixed clamp body (53), a movable clamp body (54), a spring C (58) and a knob (57); threaded holes are processed on two sides of the upper cover plate, the upper cover plate is connected and combined with a connecting block of a connecting key (4) by using bolts, a groove is processed at the bottom of the fixed clamp body, a metallographic specimen with a special shape is convenient to place and clamp, a round table is attached to the upper part of the fixed clamp body, 4 small round holes and 2 small convex shafts are processed, the fixed clamp body is convenient to position and clamp, 4 auxiliary clamping positioning grooves are processed at the bottom of the sleeve, 4 round table stepped through holes are processed at the upper part of the sleeve, 4 small shafts and 4 springs are assembled inside the sleeve, and the springs are embedded into the small shafts; the clamp body can change the grinding and polishing direction under the condition that the metallographic specimen is not changed by adjusting the combination position of the small convex shaft and the clamping positioning groove, so that errors are avoided.

6. The adjustable clamp of claim 1, wherein: the two sides of the right-angle connecting rod (6) are provided with M6 threaded holes, and the right-angle connecting rod is respectively connected with the force application rod (1) and the force application shaft (2) through bolts to play a role in transferring force.

7. The adjustable clamp of claim 1, wherein: the spring A (7) adopts a national standard end part and is a tightly ground flat spring, the spring moves downwards together with the force application shaft (2) when stressed and compressed, and after the applied force is released, the spring A (7) resets due to the elastic principle to drive the sample clamp (5) to be far away from the grinding and polishing machine; the spring a acts as a relaxing force in the device.

8. The adjustable clamp of claim 1, wherein: disc (8) processing has 4 interval 90 fluting mouths for lay sample anchor clamps guide rail (3), and bolted connection is passed through with sample anchor clamps guide rail (3) in disc (8), and disc (8) processing has the flat groove in every notch bottom, is convenient for adjust the removal of sample anchor clamps (5), processes the screw hole that has M6 at the center of disc (8) to be connected with application of force axle (2) with the bolt.

9. The adjustable clamp of claim 1, wherein: a base (9) with a through hole on the upper part for placing the force application shaft (2) and the spring A (7) and reducing the weight of the base; the side surface is provided with a small bump, the bump can be connected with the base (9) through welding or a bolt, a threaded hole is processed in the small bump, the small bump is connected with the force application rod (1) through the bolt, and the base (9) can be connected with the bottom plate (10) through welding or can be connected through the bolt.

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