Self-adaptive magnetorheological polishing machine

By using a combination of PLC control cabinet, polishing motor, sensor and adjustment mechanism in the polishing machine, efficient polishing of irregular polishing objects is achieved, the problem of the inability to maintain constant polishing force is solved, processing stability and efficiency are improved, and resource recycling is realized.

CN222767938UActive Publication Date: 2025-04-18CHANGCHUN UNIV OF TECH
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Patent Information

Application Number
CN202420886022.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-06
Publication Date
2025-04-18
Estimated Expiration
2035-03-06

AI Technical Summary

Technical Problem

When existing polishing machines deal with irregular polishing objects, the polishing force cannot be kept constant, resulting in low polishing efficiency.

Method used

An adaptive magnetorheological polishing machine is designed, which adopts a polishing mechanism including a PLC control cabinet, a polishing motor, a sensor and a adjustment mechanism. The signal is detected through the sensor and the operation of the polishing motor is controlled to keep the polishing force constant, and three-dimensional movement is realized through the adjustment mechanism to adapt to polishing at different locations.

Benefits of technology

By keeping the polishing force constant, the stability and accuracy of processing are significantly improved, the cleanliness of the working environment and the effective recycling of resources are ensured, and the polishing efficiency is improved.

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Abstract

The utility model relates to the technical field of magneto-rheological polishing machines, in particular to a self-adaptive magneto-rheological polishing machine which comprises a polishing mechanism, the polishing mechanism comprises a PLC control cabinet and a fixing frame, the top of a T-shaped groove is fixedly connected with a fixing base through a bolt, a limiting wheel drives a belt to rotate, the belt drives the other limiting wheel to rotate, and the other limiting wheel drives the fixing base to rotate. One limiting wheel drives the polishing head to rotate in the limiting plate and the fixing frame, the other limiting wheel drives the polishing head to rotate in the limiting plate and the fixing frame, the polishing head is arranged at the top of the disc-shaped workpiece but not in contact with the disc-shaped workpiece, the disc-shaped workpiece is polished through magneto-rheological, and finally redundant magneto-rheological fluid smoothly flows out through the fluid outlet and can be recycled after proper treatment. And under the action of the polishing mechanism, the polishing force can be kept constant in the whole machining process, so that the machining stability and precision are remarkably improved, the cleanliness and safety of the working environment are ensured by recycling the magnetorheological fluid, and the effect of effectively recycling resources is achieved.
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Description

Technical Field

[0001] The utility model relates to the technical field of magnetorheological polishing machines, in particular to an adaptive magnetorheological polishing machine. Background Art

[0002] In recent years, with the rapid development of electronic information technology, the demand for new optical materials has become increasingly strong. As a new type of optical material, hard and brittle materials have been widely used in aerospace, optoelectronic communications and civil industries due to their superior physical and chemical properties. In order to ensure that the physical and chemical properties of hard and brittle materials are well utilized, ultra-precision machining technology is required to obtain high surface quality and machining efficiency. Magnetorheological polishing technology, as an emerging technology in ultra-precision machining, is widely used in ultra-precision machining of hard and brittle materials. However, in magnetorheological polishing technology, the polishing device plays a decisive role in the machining efficiency and machining accuracy of hard and brittle materials.

[0003] Most of the existing polishing machines require the polishing head to directly contact the object to be polished. If an irregular polishing object is encountered, it is not convenient to polish it, and the polishing force cannot be kept constant throughout the entire processing process, resulting in low polishing efficiency. Therefore, an adaptive magnetorheological polishing machine is developed. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the fact that most of the above-mentioned or existing technologies require the polishing head to directly contact the object to be polished, if an irregular polishing object is encountered, it is inconvenient to polish it, and the polishing force cannot be kept constant throughout the entire processing flow, resulting in low polishing efficiency, the present utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a self-adaptive magnetorheological polishing machine.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] As a preferred solution of the adaptive magnetorheological polishing machine of the utility model, it comprises: a bearing mechanism, comprising a workbench, a side door is hingedly connected to one side of the workbench, and a T-shaped groove is arranged on the inner surface of the workbench;

[0009] As a preferred solution of the adaptive magnetorheological polishing machine of the utility model, wherein: a polishing mechanism is arranged on the top of the T-shaped groove, and an adjusting mechanism is arranged inside the workbench.

[0010] As a preferred solution of the adaptive magnetorheological polishing machine of the utility model, the polishing mechanism includes a PLC control cabinet and a fixed frame, the top of the T-slot is fixedly connected to a fixed base by bolts, the top of the fixed base is fixedly installed with a hollow column, the top of the hollow column is fixedly connected to a collecting cover, the top of the collecting cover is provided with a fixed platform, the top of the fixed platform is fixedly connected with a storage tank, the bottom of the collecting cover is connected to a drain port, the inner surface of the hollow column is fixedly installed with a fixed cross plate, and the top of the fixed cross plate is provided with a sensor.

[0011] As a preferred solution of the adaptive magnetorheological polishing machine of the utility model, one side of the fixed frame is fixedly connected to a limit plate by bolts, an adapter block is fixedly installed on the top of the limit plate, a polishing motor is adaptably installed on the top of the adapter block, a limit wheel is fixedly provided on the outer surface of the output end of the polishing motor, a belt is transmission-connected to the outer surface of the limit wheel, and a polishing head is rotationally connected to the inside of the limit plate.

[0012] As a preferred solution of the adaptive magnetorheological polishing machine of the utility model, the sensor is electrically connected to the PLC control cabinet, the sensor is located at the center of the storage tank and the fixed platform hole, the fixed base is adapted to the T-slot, there are two limit wheels, both limit wheels are connected by belt drive, the other limit wheel is fixedly sleeved on the outer surface of the polishing head, the polishing head is rotatably connected to the inside of the fixed frame, and the polishing head is located on the top of the collecting cover.

[0013] As a preferred solution of the adaptive magnetorheological polishing machine of the utility model, the adjustment mechanism includes a groove plate, one side of the groove plate is adapted to be installed with a lateral displacement motor, the output end of the lateral displacement motor is fixedly installed with a lateral threaded rod, the outer surface of the lateral threaded rod is threadedly connected with an L-shaped plate, and the top of the L-shaped plate is adapted to be installed with a longitudinal displacement motor.

[0014] As a preferred solution of the adaptive magnetorheological polishing machine of the utility model, wherein: the output end of the longitudinal displacement motor is fixedly connected with a longitudinal threaded rod, the inside of the L-shaped plate is slidably connected with a telescopic block, and a telescopic cylinder is arranged inside the telescopic block.

[0015] As a preferred solution of the adaptive magnetorheological polishing machine of the utility model, wherein: the groove plate is fixedly installed inside the workbench, the other end of the transverse threaded rod is rotatably connected to the groove plate, the L-shaped plate is slidably connected inside the groove plate, the other end of the longitudinal threaded rod is rotatably connected to the L-shaped plate, the telescopic block is threadedly connected to the outer surface of the longitudinal displacement motor, and the other side of the telescopic block and the telescopic cylinder are both fixedly connected to the fixed frame.

[0016] The beneficial effects of the adaptive magnetorheological polishing machine of the utility model are as follows: through the action of the polishing mechanism, the polishing force can be kept constant in the entire processing process, thereby significantly improving the stability and accuracy of the processing; by recycling the magnetorheological fluid, it not only ensures the cleanliness and safety of the working environment, but also realizes the effective recycling of resources; by using the adjustment mechanism, a three-dimensional motion state is achieved, thereby performing polishing at different positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0018] Figure 1 It is an overall schematic diagram of the utility model.

[0019] Figure 2 It is a partial structural schematic diagram of the utility model.

[0020] Figure 3 It is a partial cross-sectional schematic diagram of the polishing mechanism of the utility model.

[0021] Figure 4 For the utility model Figure 3 A magnified schematic diagram of B.

[0022] Figure 5 For the utility model Figure 4 A is an enlarged schematic diagram.

[0023] Figure 6 It is a structural schematic diagram of the adjustment mechanism of the utility model.

[0024] Legend: 100, bearing mechanism; 101, workbench; 102, T-slot; 103, side door; 200, polishing mechanism; 201, PLC control cabinet; 202, polishing motor; 203, fixed base; 204, hollow column; 205, drain port; 206, collection cover; 207, sensor; 208, storage tank; 209, fixed table; 210, fixed cross plate; 211, adapter block; 212, fixed frame; 213, limit plate; 214, polishing head; 215, belt; 216, limit wheel; 300, adjustment mechanism; 301, lateral displacement motor; 302, groove plate; 303, L-shaped plate; 304, telescopic cylinder; 305, longitudinal displacement motor; 306, longitudinal threaded rod; 307, lateral threaded rod; 308, telescopic block. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included. Example

[0029] Reference Figure 2 , 3 and 4, which is the first embodiment of the utility model, which provides a polishing mechanism 200, which can keep the polishing force constant throughout the entire processing process, thereby significantly improving the stability and accuracy of the processing.

[0030] Specifically, the polishing mechanism 200 includes a PLC control cabinet 201 and a fixed frame 212. The top of the T-slot 102 is fixedly connected to a fixed base 203 by bolts. The top of the fixed base 203 is fixedly installed with a hollow column 204. The top of the hollow column 204 is fixedly connected to a collecting cover 206. The top of the collecting cover 206 is provided with a fixed platform 209. The top of the fixed platform 209 is fixedly connected with a storage tank 208. The bottom of the collecting cover 206 is connected to a drain port 205. The inner surface of the hollow column 204 is fixedly installed with a fixed horizontal plate 210, and the top of the fixed horizontal plate 210 is provided with a sensor 207.

[0031] Furthermore, one side of the fixing frame 212 is fixedly connected to the limiting plate 213 by bolts, the top of the limiting plate 213 is fixedly installed with an adapter block 211, the top of the adapter block 211 is adapter-installed with a polishing motor 202, the outer surface of the output end of the polishing motor 202 is fixedly sleeved with a limiting wheel 216, the outer surface of the limiting wheel 216 is transmission-connected with a belt 215, and the internal rotation of the limiting plate 213 is connected to a polishing head 214.

[0032] Among them, the sensor 207 is electrically connected to the PLC control cabinet 201, the sensor 207 is located at the center of the storage tank 208 and the hole of the fixed platform 209, the fixed base 203 is adapted to the T-slot 102, there are two limit wheels 216, and the two limit wheels 216 are connected by belts 215. The other limit wheel 216 is fixedly mounted on the outer surface of the polishing head 214, and the polishing head 214 is rotatably connected to the inside of the fixed frame 212. The polishing head 214 is located at the top of the collection cover 206.

[0033] When in use, the disc-shaped workpiece to be processed is placed in the collecting cover 206, the disc-shaped workpiece is tightly fitted with the storage tank 208, a certain amount of magnetorheological fluid is placed above the disc-shaped workpiece, and the sensor 207 below the disc-shaped workpiece detects relevant signals, and quickly transmits the detected signals to the PLC control cabinet 201 through wires. At this time, polishing can be carried out, and the operation of the polishing motor 202 is controlled. The polishing motor 202 drives the limit wheel 216 to rotate, the limit wheel 216 drives the belt 215 to rotate, the belt 215 drives another limit wheel 216 to rotate, and the other limit wheel 216 drives the polishing head 214 to rotate in the limit plate 213 and the fixed frame 212, and the polishing head 214 is placed on the top of the disc-shaped workpiece but not in contact, and the disc-shaped workpiece is polished by magnetorheology. Finally, the excess magnetorheological fluid flows out smoothly through the drain port 205 and can be recycled again after proper treatment.

[0034] In summary, through the action of the polishing mechanism 200, the polishing force can be kept constant throughout the entire processing process, thereby significantly improving the stability and accuracy of the processing. By recycling the magnetorheological fluid, the cleanliness and safety of the working environment are ensured, and the effective recycling of resources is achieved. Example

[0035] Reference Figure 2 , 5 6 is the second embodiment of the utility model. Different from the previous embodiment, this embodiment provides an adjustment mechanism 300 to achieve a three-dimensional motion state, adapt to different positions of the workpiece to be polished, and improve the polishing efficiency.

[0036] Specifically, the adjustment mechanism 300 includes a groove plate 302, one side of the groove plate 302 is adapted to be installed with a lateral displacement motor 301, the output end of the lateral displacement motor 301 is fixedly installed with a lateral threaded rod 307, the outer surface of the lateral threaded rod 307 is threadedly connected with an L-shaped plate 303, and the top of the L-shaped plate 303 is adapted to be installed with a longitudinal displacement motor 305.

[0037] Furthermore, the output end of the longitudinal displacement motor 305 is fixedly connected with a longitudinal threaded rod 306 , the inside of the L-shaped plate 303 is slidably connected with a telescopic block 308 , and the inside of the telescopic block 308 is provided with a telescopic cylinder 304 .

[0038] Among them, the groove plate 302 is fixedly installed inside the workbench 101, the other end of the transverse threaded rod 307 is rotatably connected to the groove plate 302, the L-shaped plate 303 is slidably connected inside the groove plate 302, the other end of the longitudinal threaded rod 306 is rotatably connected to the L-shaped plate 303, the telescopic block 308 is threadedly connected to the outer surface of the longitudinal displacement motor 305, and the other side of the telescopic block 308 and the telescopic cylinder 304 are fixedly connected to the fixed frame 212.

[0039] When in use, when it is necessary to adapt to polishing in different positions and when it is necessary to move the polishing sideways, the operation of the lateral displacement motor 301 is controlled, and the lateral displacement motor 301 drives the lateral threaded rod 307 to rotate with the assistance of the groove plate 302, and the lateral threaded rod 307 drives the L-shaped plate 303 to move in the groove plate 302, and the lateral threaded rod 307 drives the telescopic block 308 to move, and the telescopic block 308 drives the fixed frame 212 to move, and the fixed frame 212 drives the limit plate 213 to move, and the limit plate 213 drives the adapter block 211 to move, and the adapter block 211 drives the polishing The photomotor 202 moves, and the fixed frame 212 drives the polishing head 214 to move to adapt to different required polishing positions. When longitudinal movement is required, the longitudinal displacement motor 305 is controlled to run, and the longitudinal displacement motor 305 drives the telescopic block 308 to move in the L-shaped plate 303, and the L-shaped plate 303 drives the telescopic cylinder 304 and the fixed frame 212 to move. Similarly, to adapt to the height of different workpieces, when forward and backward movement is required, the operation of the telescopic cylinder 304 is controlled, and the telescopic cylinder 304 drives the fixed frame 212 to move with the assistance of the telescopic block 308. Similarly, it adapts to the front and rear positions of the workpieces.

[0040] In summary, by using the adjustment mechanism 300, a three-dimensional motion state is achieved, which adapts to different positions of the workpiece to be polished, improves the polishing efficiency, and enables better polishing of the workpiece, thereby performing polishing at different positions. Example

[0041] Reference Figure 2 , 4 , 5 and 6 are the third embodiment of the utility model. Different from the previous embodiment, this embodiment provides an adjustment mechanism 300 to achieve a three-dimensional motion state and adapt to different positions of the workpiece to be polished. Through the polishing mechanism 200, the polishing force can be kept constant throughout the entire processing flow, thereby significantly improving the stability and accuracy of the processing.

[0042] Specifically, the polishing mechanism 200 includes a PLC control cabinet 201 and a fixed frame 212. The top of the T-slot 102 is fixedly connected to a fixed base 203 by bolts. The top of the fixed base 203 is fixedly installed with a hollow column 204. The top of the hollow column 204 is fixedly connected to a collecting cover 206. The top of the collecting cover 206 is provided with a fixed platform 209. The top of the fixed platform 209 is fixedly connected with a storage tank 208. The bottom of the collecting cover 206 is connected to a drain port 205. The inner surface of the hollow column 204 is fixedly installed with a fixed horizontal plate 210, and the top of the fixed horizontal plate 210 is provided with a sensor 207.

[0043] Furthermore, the adjustment mechanism 300 includes a groove plate 302, one side of the groove plate 302 is adapted to be installed with a lateral displacement motor 301, the output end of the lateral displacement motor 301 is fixedly installed with a lateral threaded rod 307, the outer surface of the lateral threaded rod 307 is threadedly connected with an L-shaped plate 303, and the top of the L-shaped plate 303 is adapted to be installed with a longitudinal displacement motor 305.

[0044] When in use, the disc-shaped workpiece fits tightly with the storage slot 208, a certain amount of magnetorheological fluid is placed above the disc-shaped workpiece, and the sensor 207 below the disc-shaped workpiece detects relevant signals, and quickly transmits the detected signals to the PLC control cabinet 201 through wires. At this time, polishing can be carried out, and the transverse displacement motor 301 drives the transverse threaded rod 307 to rotate with the assistance of the groove plate 302, and the transverse threaded rod 307 drives the L-shaped plate 303 to move in the groove plate 302, and the transverse threaded rod 307 drives the telescopic block 308 to move, and the telescopic block 308 drives the fixed frame 212 to move, and the fixed frame 212 drives the limit plate 213 to move, and the limit plate 213 drives the adapter block 211 to move.

[0045] In summary, by using the adjustment mechanism 300, a three-dimensional motion state is achieved, the polishing efficiency is improved, and the workpiece can be better polished. Under the action of the polishing mechanism 200, the polishing force can be kept constant throughout the entire processing process, thereby improving the stability of the processing. The recovery of the magnetorheological fluid ensures a clean working environment and realizes the role of resource recycling.

[0046] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also an equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0047] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention).

[0048] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An adaptive magnetorheological polishing machine, characterized in that: include, The bearing mechanism (100) comprises a workbench (101), a side door (103) being hingedly connected to one side of the workbench (101), and a T-shaped groove (102) being provided on the inner surface of the workbench (101); Furthermore, a polishing mechanism (200) is provided on the top of the T-shaped groove (102), and an adjusting mechanism (300) is provided inside the workbench (101).

2. The adaptive magnetorheological polishing machine according to claim 1, characterized in that: The polishing mechanism (200) comprises a PLC control cabinet (201) and a fixed frame (212); the top of the T-slot (102) is fixedly connected to a fixed base (203) by means of bolts; the top of the fixed base (203) is fixedly mounted with a hollow column (204); the top of the hollow column (204) is fixedly connected to a collecting hood (206); the top of the collecting hood (206) is provided with a fixed platform (209); the top of the fixed platform (209) is fixedly connected to a storage tank (208); the bottom of the collecting hood (206) is connected to a drain port (205); the inner surface of the hollow column (204) is fixedly mounted with a fixed horizontal plate (210); the top of the fixed horizontal plate (210) is provided with a sensor (207).

3. The adaptive magnetorheological polishing machine according to claim 2, characterized in that: One side of the fixing frame (212) is fixedly connected to a limit plate (213) by means of bolts, an adaptor block (211) is fixedly mounted on the top of the limit plate (213), a polishing motor (202) is adaptably mounted on the top of the adaptor block (211), a limit wheel (216) is fixedly sleeved on the outer surface of the output end of the polishing motor (202), a belt (215) is transmission-connected to the outer surface of the limit wheel (216), and a polishing head (214) is rotationally connected to the inside of the limit plate (213).

4. The adaptive magnetorheological polishing machine according to claim 3, characterized in that: The sensor (207) is electrically connected to the PLC control cabinet (201); the sensor (207) is located at the center of the storage tank (208) and the hole of the fixed platform (209); the fixed base (203) is adapted to the T-shaped slot (102); there are two limit wheels (216); the two limit wheels (216) are connected by belt (215); the other limit wheel (216) is fixedly sleeved on the outer surface of the polishing head (214); the polishing head (214) is rotatably connected to the inside of the fixed frame (212); and the polishing head (214) is located on the top of the collection cover (206).

5. The adaptive magnetorheological polishing machine according to claim 4, characterized in that: The adjustment mechanism (300) comprises a groove plate (302), a lateral displacement motor (301) being adapted to be mounted on one side of the groove plate (302), a lateral threaded rod (307) being fixedly mounted on the output end of the lateral displacement motor (301), an L-shaped plate (303) being threadedly connected to the outer surface of the lateral threaded rod (307), and a longitudinal displacement motor (305) being adapted to be mounted on the top of the L-shaped plate (303).

6. The adaptive magnetorheological polishing machine according to claim 5, characterized in that: The output end of the longitudinal displacement motor (305) is fixedly connected to a longitudinal threaded rod (306), the interior of the L-shaped plate (303) is slidably connected to a telescopic block (308), and a telescopic cylinder (304) is disposed inside the telescopic block (308).

7. The adaptive magnetorheological polishing machine according to claim 6, characterized in that: The groove plate (302) is fixedly mounted inside the workbench (101); the other end of the transverse threaded rod (307) is rotatably connected to the groove plate (302); the L-shaped plate (303) is slidably connected inside the groove plate (302); the other end of the longitudinal threaded rod (306) is rotatably connected to the L-shaped plate (303); the telescopic block (308) is threadedly connected to the outer surface of the longitudinal displacement motor (305); and the other sides of the telescopic block (308) and the telescopic cylinder (304) are both fixedly connected to the fixed frame (212).