CN212444405U - Accurate polishing equipment for surface of carbon-carbon revolution body - Google Patents

Abstract

The utility model discloses a carbon-carbon solid of revolution surface accurate equipment of polishing, including bed plate and grinding machanism, grinding machanism includes vertical support shell and third motor, third motor output shaft end passes through the second shaft coupling and is connected with the second lead screw lower extreme in the case casing, the case casing passes through on fixed connection board and the first fix with screw vertical support shell, set up second screw-nut on the second lead screw, and the fixed diaphragm that sets up of second screw-nut side stretches out logical groove, the terminal surface is provided with guide bar fixing base and guide bar before the diaphragm, the guide block phase-match on guide bar and the vertical fly leaf, the tip sets up pneumatic angle mill under the vertical fly leaf, pneumatic angle mill below sets up clamping mechanism. The utility model discloses it can realize the clamping to the carbon solid of revolution, carry and the operation of polishing, reduces artifical intensity of labour who polishes, improves the efficiency of polishing, satisfies the carbon-carbon composite solid of revolution demand of polishing of co-altitude and different models, and practicality and creativity are very strong.

Description

Accurate polishing equipment for surface of carbon-carbon revolution body

Technical Field

The utility model relates to a carbon solid of revolution technical field that polishes specifically is carbon solid of revolution surperficial accurate equipment of polishing.

Background

The carbon-carbon revolving body structure parts are very widely applied and have large market demand. In the preparation process of the product, the carbon fiber preform needs to be subjected to chemical vapor deposition, impregnation, carbonization and other processes for many times. After each process, a large number of burrs, carbon nodules, carbon powder and other attachments are generated on the surface of the carbon fiber preform, and therefore, the surface must be polished and cleaned.

Because carbon solid of revolution work piece is the drum structure mostly, in the processing operation process of polishing, have following technical problem: 1. the carbon revolving bodies have different models and specifications, the conventional fixed clamping device is difficult to perform self-centering positioning operation on the carbon revolving bodies, the clamping difficulty is high, the clamping efficiency is low, the phenomenon of uneven surface occurs in the polishing operation process, the polishing operation requirements of enterprises for large-batch processing are difficult to meet, the molding quality of the surfaces of the carbon revolving bodies polished and processed is poor, and the stability of the clamp is poor; 2. the clamped carbon-carbon revolving body needs to be conveyed to the position of the polishing mechanism by enterprise staff, so that the transportation difficulty is high, the labor intensity is high, the physical strength of the enterprise staff is greatly consumed, the transportation efficiency is poor, the labor cost of the enterprise is greatly increased, and the economic benefit is reduced; 3. in the process of conveying the clamped carbon-carbon revolving body to the position of the polishing mechanism, the workpiece and the clamp body are not free from vibration, and the larger the specification of the part to be processed is, the more easily the part to be processed is deviated and slides, so that the phenomenon of unstable clamping is caused; 4. the existing polishing mode is that a worker holds a polisher to polish the surface of a carbon revolving body, the labor intensity is high, the requirement on the arm strength of the worker is high, the polishing work is carried out continuously, the arm ache of the worker is difficult to carry out the polishing operation continuously, the polishing and forming quality of a product is poor, and 5, in the polishing operation process of a polishing device for polishing the clamped carbon revolving body, the workpiece can jump on a horizontal plane due to the uneven quality of the workpiece, the phenomenon of uneven or excessive polishing of the surface of the workpiece in the polishing process is caused, the processing quality and the appearance forming quality of the product are greatly influenced, the rejection rate is increased, and the enterprise development is not facilitated; therefore, the present invention is improved in view of the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at above problem, provide accurate equipment of polishing in carbon solid of revolution surface, it can realize the clamping to the carbon solid of revolution, carry and the operation of polishing, easy operation, and convenient to use reduces artifical intensity of labour who polishes, improves the efficiency of polishing, satisfies the carbon-carbon composite solid of revolution demand of polishing of co-altitude and different models, and practicality and creativity are very strong.

In order to realize the above purpose, the utility model adopts the technical scheme that: the carbon revolving body surface accurate polishing device comprises a base plate and a polishing mechanism, wherein the polishing mechanism comprises a vertical supporting shell and a third motor arranged on the base plate at intervals, the output shaft end of the third motor is connected with the lower end of a second screw rod in a box shell through a second coupling, the box shell is fixed on the vertical supporting shell through a fixed connecting plate and a first screw, a second bearing is arranged between the second screw rod and the box shell, a second screw rod nut is arranged on the second screw rod in a matched manner, a transverse plate fixedly arranged at the side end of the second screw rod nut extends out of a through groove, the front end surface of the transverse plate is provided with a guide rod fixing seat and a guide rod, the guide rod is matched with a guide block on a vertical movable plate, the lower end part of the vertical movable plate is provided with a pneumatic angle grinder for polishing the surface of a carbon revolving body, a clamping mechanism for clamping the carbon revolving, the lower tip that the pivot passed the support frame is connected through first shaft coupling and the first motor output shaft end on the movable table, and the movable table can be horizontal linear motion along the direction of the vertical support shell of perpendicular to on the bed plate, and is provided with the shock attenuation balance mechanism who plays the cushioning effect between movable table and the support frame.

As the utility model discloses a further optimization, the fixed revolving cylinder that sets up of terminal surface before the vertical fly leaf, the swing board is connected to the revolving cylinder output shaft end, and the pneumatic angle mill of buckle fixed connection through the semicircle ring structure form on the swing board, and the head of polishing of pneumatic angle mill can contact the carbon revolution surface.

As the utility model discloses a further optimization, vertical fly leaf passes through the second screw and crosses the cab apron and be connected with the flexible axle head of cylinder, and the cylinder sets up on the cylinder mount pad on bracket upper portion, and the bracket passes through third screw fixed mounting in the preceding tip of diaphragm.

As the utility model discloses a further optimization, clamping mechanism includes the end cover, and the end cover lower surface passes through the fourth bolt and is connected with the pivot upper end, and the end cover passes through third bolted connection lower cover plate, and the lower cover plate top is provided with the supporting seat, and the supporting seat top is provided with the spiral carousel, and the spiral carousel upper surface matches through the screw thread boss of thread groove and activity plate body lower surface, and the activity plate body upwards passes the upper cover plate and through first bolted connection jack catch, and the jack catch is the annular array along the upper cover plate center and distributes.

As the utility model discloses a further optimization, the supporting seat side just is provided with bevel gear in spiral carousel below, and bevel gear's conical tooth face and the transmission of spiral carousel bottom conical tooth face meshing, and bevel gear keeps away from the one end of supporting seat and is provided with the rectangle blind hole, and bevel gear can drive spiral carousel rotatory when doing rotary motion to make the activity plate body draw close each other or keep away from towards the upper cover plate center.

As the utility model discloses a further optimization, upper cover plate, supporting seat and apron are connected through the second bolt down, are provided with flexible pad down between apron and the end cover, and flexible pad adopts rubber materials to make, and the side of jack catch is provided with anti-skidding arch.

As the utility model discloses a further optimization, shock attenuation balance mechanism includes the upper junction plate, and the upper junction plate passes through fifth bolted connection support frame, sets up first bearing between support frame and the pivot, and in the piston rod of upper junction plate bottom central authorities stretched into the pipe box downwards, the inside spring that sets up of pipe box, the tip passed through the sixth bolt under the pipe box and connected the movable platform with lower connecting plate.

As the utility model discloses a further optimization, the movable table lower surface interval sets up the slider, and the guide rail phase-match on slider and the bed plate, and movable table bottom central authorities are fixed to be set up first screw-nut, and the first lead screw phase-match of first screw-nut and second motor output shaft end.

As a further optimization of the utility model, the use method of the carbon-carbon revolving body surface precise polishing equipment,

step A: placing the carbon-carbon revolving body between the clamping jaws, inserting a chuck wrench into the rectangular blind hole by a worker, and rotating the bevel gear to enable the clamping mechanism to clamp the carbon-carbon composite revolving body;

and B: driving a second motor, enabling the movable table to do longitudinal horizontal linear motion on the base plate, and conveying the clamping mechanism and the carbon-carbon composite material revolving body workpiece to the position right below the pneumatic angle grinder to prepare for grinding operation;

and C: and the pneumatic angle grinder is driven to grind the surface of the carbon-carbon composite material revolving body.

The utility model has the advantages that: the utility model provides a carbon solid of revolution surface accuracy equipment of polishing, it can realize the clamping to the carbon solid of revolution, carry and the operation of polishing, easy operation, and convenient to use reduces artifical intensity of labour who polishes, improves the efficiency of polishing, satisfies the carbon-carbon combined material solid of revolution demand of polishing of co-altitude and different models, and practicality and creativity are very strong.

1. The utility model discloses be provided with clamping mechanism, the staff inserts the chuck spanner to the rectangle blind hole in, rotates bevel gear, and bevel gear can drive the spiral carousel rotatory when being rotary motion to make the activity plate body draw close each other or keep away from towards the upper cover plate center, thereby make the jack catch from the tight carbon solid of revolution of centering clamp, stability is high, satisfies the carbon solid of revolution of different models and polishes the user demand of operation processing.

2. The utility model discloses be provided with second motor, movable table, slider, guide rail, first screw-nut, first lead screw, drive second motor can drive clamping mechanism and carbon solid of revolution work piece and pass vertical support shell, carries to pneumatic angle grinder under, has replaced traditional artifical mode of carrying, has reduced intensity of labour, has improved labor efficiency.

3. The utility model discloses be provided with shock attenuation balance mechanism, in carbon solid of revolution work piece and clamping mechanism transportation, shock attenuation balance mechanism can effectually avoid appearing violent vibrations, and at the in-process of polishing, shock attenuation balance mechanism can play and hinder the carbon solid of revolution to take place to rock, the effect of beating on the surface of water to it is inhomogeneous to avoid polishing the in-process appearance, the not beautiful phenomenon of upper and lower surface quality.

4. The utility model discloses be provided with grinding machanism, the staff is through driving actuating cylinder and third motor, makes pneumatic angle mill hover in the carbon-carbon composite solid of revolution and treats processing position department, drives pneumatic angle mill and polishes the operation to carbon-carbon composite solid of revolution surface, realizes mechanized and standardized operation of polishing, replaces the artifical handheld mode of polishing of tradition, has both reduced intensity of labour, has also improved the precision and the processingquality of polishing, and for the big batch carbon-carbon composite solid of revolution of enterprise operation improvement economic benefits of polishing.

Drawings

Fig. 1 is a schematic view of the structure of the present invention.

Fig. 2 is a schematic view of the top view structure of the present invention.

Fig. 3 is the structure diagram of the main view of the position of the middle clamping mechanism and the damping balance mechanism of the present invention.

Fig. 4 is a schematic view of the structure of the middle clamping mechanism of the present invention.

Fig. 5 is a schematic view of a three-dimensional structure at the middle jaw position of the present invention.

Fig. 6 is a schematic top view of the structure of fig. 5.

Fig. 7 is a schematic structural view of a second screw nut of the present invention.

Fig. 8 is a schematic view of the three-dimensional structure of the middle vertical movable plate of the present invention.

Fig. 9 is a schematic view of the three-dimensional structure of the pneumatic angle grinder of the present invention.

Fig. 10 is a schematic structural view of the middle damping balance mechanism of the present invention.

The text labels in the figures are represented as: 1. a clamping mechanism; 2. a base plate; 3. a polishing mechanism; 4. A shock absorbing balance mechanism; 101. a claw; 102. a first bolt; 103. a movable plate body; 104. a threaded boss; 105. an upper cover plate; 106. a second bolt; 107. a spiral turntable; 108. a flexible pad; 109. A supporting seat; 110. a third bolt; 111. a lower cover plate; 112. a bevel gear; 113. a rectangular blind hole; 114. an end cap; 201. a fourth bolt; 202. a support frame; 203. a first bearing; 204. a rotating shaft; 205. a first coupling; 206. a first motor; 207. a movable table; 208. a slider; 209. a guide rail; 210. a first lead screw nut; 211. a first lead screw; 212. a second motor; 301. a third motor; 302. a vertical support housing; 303. a second coupling; 304. fixing the connecting plate; 305. a first screw; 306. a second lead screw; 307. a case housing; 308. a through groove; 309. polishing head; 310. a second feed screw nut; 311. a second bearing; 312. a transverse plate; 313. a guide rod fixing seat; 314. a guide bar; 315. a guide block; 316. a vertical movable plate; 317. a transition plate; 318. a second screw; 319. A cylinder; 320. a third screw; 321. a bracket; 322. a cylinder mounting seat; 323. a rotating cylinder; 324. a swing plate; 325. a retaining ring; 326. a pneumatic angle grinder; 401. an upper connecting plate; 402. a fifth bolt; 403. a piston rod; 404. pipe sleeve; 405. a spring; 406. a sixth bolt; 407. a lower connecting plate.

Detailed Description

In order to make the technical solution of the present invention better understood, the present invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is only exemplary and explanatory, and should not be construed as limiting the scope of the present invention.

As shown in fig. 1-10, the specific structure of the present invention is: the grinding mechanism 3 comprises a base plate 2 and a grinding mechanism 3, the grinding mechanism 3 comprises a vertical support shell 302 and a third motor 301 arranged on the base plate 2 at intervals, the output shaft end of the third motor 301 is connected with the lower end of a second screw rod 306 in a box shell 307 through a second coupling 303, the box shell 307 is fixed on the vertical support shell 302 through a fixed connecting plate 304 and a first screw 305, a second bearing 311 is arranged between the second screw rod 306 and the box shell 307, a second screw rod nut 310 is arranged on the second screw rod 306 in a matching way, a transverse plate 312 fixedly arranged at the side end of the second screw rod nut 310 extends out of a through groove 308, a guide rod fixing seat 313 and a guide rod 314 are arranged on the front end surface of the transverse plate 312, the guide rod 314 is matched with a guide block 315 on a vertical movable plate 316, a pneumatic angle grinder 326 used for grinding the surface of a carbon revolution body is arranged at the lower end of the vertical movable plate 316, a clamping, the lower end of the clamping mechanism 1 is connected with a rotating shaft 204, the rotating shaft 204 passes through the lower end of the support frame 202 and is connected with the output shaft end of a first motor 206 on a movable table 207 through a first coupling 205, the movable table 207 can make horizontal linear motion on the base plate 2 along the direction perpendicular to the vertical support shell 302, and a damping balance mechanism 4 with a damping effect is arranged between the movable table 207 and the support frame 202.

Preferably, in order to facilitate the polishing operation on the surface of the carbon-carbon revolution body, a rotating cylinder 323 is fixedly arranged on the front end face of the vertical movable plate 316, the output shaft end of the rotating cylinder 323 is connected with a swinging plate 324, the swinging plate 324 is fixedly connected with a pneumatic angle grinder 326 through a retaining ring 325 of a semicircular ring, and a polishing head 309 of the pneumatic angle grinder 326 can contact the surface of the carbon-carbon revolution body.

Preferably, in order to facilitate the polishing operation on the surface of the carbon-carbon rotating body, the vertical movable plate 316 is connected to the telescopic shaft end of the cylinder 319 through the second screw 318 and the transition plate 317, the cylinder 319 is disposed on the cylinder mounting seat 322 on the upper portion of the bracket 321, and the bracket 321 is fixedly mounted on the front end portion of the transverse plate 312 through the third screw 320.

Preferably, in order to facilitate the implementation of the clamping operation on the carbon-carbon revolving body, the clamping mechanism 1 includes an end cover 114, a lower surface of the end cover 114 is connected with an upper end portion of the rotating shaft 204 through a fourth bolt 201, the end cover 114 is connected with a lower cover plate 111 through a third bolt 110, a supporting seat 109 is arranged above the lower cover plate 111, a spiral rotary table 107 is arranged above the supporting seat 109, an upper surface of the spiral rotary table 107 is matched with a thread boss 104 on a lower surface of the movable plate body 103 through a thread groove, the movable plate body 103 upwards passes through the upper cover plate 105 and is connected with the clamping jaws 101 through first bolts 102, and the clamping jaws 101 are distributed along.

Preferably, in order to facilitate the clamping operation of the carbon-carbon revolving body, a bevel gear 112 is arranged at the side end of the supporting seat 109 and below the spiral turntable 107, the bevel gear surface of the bevel gear 112 is in meshing transmission with the bevel gear surface at the bottom of the spiral turntable 107, a rectangular blind hole 113 is arranged at one end of the bevel gear 112, which is far away from the supporting seat 109, and the spiral turntable 107 can be driven to rotate when the bevel gear 112 rotates, so that the movable plate body 103 is close to or far away from the center of the upper cover plate 105.

Preferably, in order to facilitate the disassembly, maintenance and replacement of the clamping mechanism 1, the upper cover plate 105, the supporting seat 109 and the lower cover plate 111 are connected by the second bolt 106, a flexible pad 108 is arranged between the lower cover plate 111 and the end cover 114, the flexible pad 108 is made of rubber material, and the side surface of the claw 101 is provided with an anti-slip bulge.

Preferably, in order to be beneficial to achieving the effect of damping and buffering the carbon-carbon revolving body workpiece in the conveying process and preventing the clamping mechanism 1 and the workpiece from shaking and jumping in the grinding process, the damping balance mechanism 4 comprises an upper connecting plate 401, the upper connecting plate 401 is connected with the supporting frame 202 through a fifth bolt 402, a first bearing 203 is arranged between the supporting frame 202 and the rotating shaft 204, a piston rod 403 in the center of the bottom of the upper connecting plate 401 extends downwards into the pipe sleeve 404, a spring 405 is arranged inside the pipe sleeve 404, and the lower end part of the pipe sleeve 404 is connected with the movable table 207 through a sixth bolt 406 and a lower connecting plate 407.

Preferably, in order to facilitate the conveying operation of the carbon-carbon revolving body workpiece, the sliding blocks 208 are arranged on the lower surface of the movable table 207 at intervals, the sliding blocks 208 are matched with the guide rails 209 on the base plate 2, the first lead screw nut 210 is fixedly arranged at the center of the bottom of the movable table 207, and the first lead screw nut 210 is matched with the first lead screw 211 at the output shaft end of the second motor 212.

A use method of the precise grinding equipment for the surface of the carbon revolving body comprises the following steps:

step A: placing the carbon rotary body between the clamping jaws 101, inserting a chuck wrench into the rectangular blind hole 113 by a worker, and rotating the bevel gear 112 to enable the clamping mechanism 1 to clamp the carbon composite rotary body;

and B: driving a second motor 212, enabling the movable table 207 to do longitudinal horizontal linear motion on the base plate 2, and conveying the clamping mechanism 1 and the carbon-carbon composite material revolving body workpiece to be right below the pneumatic angle grinder 326 to prepare for grinding operation;

and C: the air cylinder 319 and the third motor 301 are driven, so that the pneumatic angle grinder 326 is suspended at the position to be processed of the carbon-carbon composite material revolving body, and the pneumatic angle grinder 326 is driven to grind the surface of the carbon-carbon composite material revolving body.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The principles and embodiments of the present invention have been explained herein using specific examples, which are presented only to assist in understanding the methods and their core concepts. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the above technical features can be combined in a proper manner; the application of these modifications, variations or combinations, or the application of the concepts and solutions of the present invention in other contexts without modification, is not intended to be considered as a limitation of the present invention.

Claims (8)

1. The carbon-carbon revolving body surface accurate grinding equipment is characterized by comprising a base plate (2) and a grinding mechanism (3), wherein the grinding mechanism (3) comprises a vertical supporting shell (302) and a third motor (301) arranged on the base plate (2) at intervals, the output shaft end of the third motor (301) is connected with the lower end of a second lead screw (306) in a box shell (307) through a second coupler (303), the box shell (307) is fixed on the vertical supporting shell (302) through a fixed connecting plate (304) and a first screw (305), a second bearing (311) is arranged between the second lead screw (306) and the box shell (307), a second lead screw nut (310) is arranged on the second lead screw (306) in a matching manner, a transverse plate (312) fixedly arranged at the side end of the second lead screw nut (310) extends out of a through groove (308), a guide rod fixing seat (313) and a guide rod (314) are arranged on the front end surface of the transverse plate (312), the guide rod (314) is matched with a guide block (315) on the vertical movable plate (316), a pneumatic angle grinder (326) used for grinding the surface of a carbon-carbon revolving body is arranged at the lower end part of the vertical movable plate (316), a clamping mechanism (1) used for clamping the carbon-carbon revolving body is arranged below the pneumatic angle grinder (326), the lower end part of the clamping mechanism (1) is connected with a rotating shaft (204), the rotating shaft (204) penetrates through the lower end part of the support frame (202) and is connected with the output shaft end of a first motor (206) on the movable table (207) through a first coupler (205), the movable table (207) can do horizontal linear motion along the direction perpendicular to the vertical support shell (302) on the base plate (2), and a damping balance mechanism (4) with a damping effect is arranged between the movable table (207) and the support frame (202).

2. The carbon-carbon revolution surface precision grinding equipment as claimed in claim 1, wherein a rotary cylinder (323) is fixedly arranged on the front end face of the vertical movable plate (316), the output shaft end of the rotary cylinder (323) is connected with a swing plate (324), the swing plate (324) is fixedly connected with a pneumatic angle grinder (326) through a semicircular ring-shaped retaining ring (325), and the grinding head (309) of the pneumatic angle grinder (326) can contact the surface of the carbon revolution.

3. The carbon-carbon revolution surface precision grinding equipment as claimed in claim 1, wherein the vertical movable plate (316) is connected with the telescopic shaft end of a cylinder (319) through a second screw (318) and a transition plate (317), the cylinder (319) is arranged on a cylinder mounting seat (322) on the upper portion of a bracket (321), and the bracket (321) is fixedly mounted on the front end portion of the transverse plate (312) through a third screw (320).

4. The carbon-carbon revolution surface precision grinding equipment is characterized in that the clamping mechanism (1) comprises an end cover (114), the lower surface of the end cover (114) is connected with the upper end of a rotating shaft (204) through a fourth bolt (201), the end cover (114) is connected with a lower cover plate (111) through a third bolt (110), a supporting seat (109) is arranged above the lower cover plate (111), a spiral turntable (107) is arranged above the supporting seat (109), the upper surface of the spiral turntable (107) is matched with a threaded boss (104) on the lower surface of a movable plate body (103) through a threaded groove, the movable plate body (103) penetrates through the upper cover plate (105) upwards and is connected with clamping jaws (101) through first bolts (102), and the clamping jaws (101) are distributed along the center of the upper cover plate (105) in an annular array.

5. The carbon-carbon revolving body surface accurate grinding equipment as claimed in claim 4, wherein a bevel gear (112) is arranged at the side end of the supporting seat (109) and below the spiral rotary table (107), the bevel gear surface of the bevel gear (112) is in meshing transmission with the bevel gear surface at the bottom of the spiral rotary table (107), a rectangular blind hole (113) is arranged at one end of the bevel gear (112) far away from the supporting seat (109), and the spiral rotary table (107) can be driven to rotate when the bevel gear (112) rotates, so that the movable plate bodies (103) are close to or far away from each other towards the center of the upper cover plate (105).

6. The carbon-carbon revolving body surface precision grinding equipment is characterized in that the upper cover plate (105), the supporting seat (109) and the lower cover plate (111) are connected through a second bolt (106), a flexible pad (108) is arranged between the lower cover plate (111) and the end cover (114), the flexible pad (108) is made of rubber materials, and the side face of the claw (101) is provided with an anti-skidding bulge.

7. The carbon-carbon rotary body surface accurate grinding equipment is characterized in that the damping balance mechanism (4) comprises an upper connecting plate (401), the upper connecting plate (401) is connected with a support frame (202) through a fifth bolt (402), a first bearing (203) is arranged between the support frame (202) and a rotating shaft (204), a piston rod (403) in the center of the bottom of the upper connecting plate (401) extends downwards into a pipe sleeve (404), a spring (405) is arranged inside the pipe sleeve (404), and the lower end of the pipe sleeve (404) is connected with a movable table (207) through a sixth bolt (406) and a lower connecting plate (407).

8. The carbon-carbon revolution surface precision grinding equipment as claimed in claim 1, wherein the sliding blocks (208) are arranged on the lower surface of the movable table (207) at intervals, the sliding blocks (208) are matched with the guide rails (209) on the base plate (2), the center of the bottom of the movable table (207) is fixedly provided with the first lead screw nut (210), and the first lead screw nut (210) is matched with the first lead screw (211) at the output shaft end of the second motor (212).

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