CN220128393U - Polishing and lifting assembly - Google Patents

Abstract

The utility model discloses a polishing and lifting assembly, which comprises two lifting assemblies and polishing assemblies, wherein the number of the polishing assemblies is two, the lifting assemblies are connected with the polishing assemblies in a matched manner, the lifting assemblies comprise a first sliding block, a fixed support, a first side plate, a lifting support, a linear sliding rail, a rotating ring, a fixed seat, gears, a lifting chain, a rotating shaft, a protection plate, a connecting ring, a bottom plate, a working motor and a first baffle, the linear sliding rail is fixedly connected to two sides of the fixed support, the first sliding block is connected to the linear sliding rail in a sliding manner, and the first sliding block is fixedly connected to the first side plate; the device is provided with lifting unit and polishing subassembly, and the polishing subassembly is located lifting unit's both sides, consequently, has increased the station of polishing, has improved the efficiency of polishing, and is provided with the dust absorption pipe, is convenient for concentrate the collection to the sweeps that the grinding produced.

Description

Polishing and lifting assembly

Technical Field

The utility model relates to the technical field of grinding machine accessories, in particular to a grinding and lifting assembly.

Background

The polisher is polishing processing equipment, and the in-process of use is polished the surface of processing to the product through the polishing subassembly of inside setting, but current polisher generally only has a grinding machanism, and the station of polishing is few to reduced polishing efficiency, consequently increase the required expense of polishing when polishing the material, the sweeps that produces at the in-process of polishing are unfavorable for collecting in a concentrated way simultaneously.

Disclosure of Invention

First, the technical problem to be solved

The utility model aims to provide a polishing and lifting assembly which is used for solving the existing defects.

(II) summary of the utility model

In order to solve the technical problems, the utility model provides the following technical scheme: the utility model provides a polishing and lifting assembly, including lifting assembly and lifting assembly, the quantity of polishing assembly is two, simultaneously the cooperation of polishing assembly is connected with lifting assembly, and lifting assembly includes first slider, the fixed bolster, first curb plate, lifting support, linear slide rail, the swivel becket, the fixing base, the gear, lift chain, the axis of rotation, the protection shield, the go-between, the bottom plate, work motor and first baffle, the both sides fixedly connected with linear slide rail of fixed bolster, and sliding connection has first slider on the linear slide rail, first slider fixedly connected with is on first curb plate, simultaneously, through bolt and triangle-shaped fixedly connected with lifting support on the first curb plate, and be connected with lift chain through U type seat rotation on the lifting support, and lift chain meshing is connected on the gear, cup joint and be fixed with the axis of rotation on the gear, the both ends of axis of rotation are connected with swivel becket and go-between respectively, and swivel becket imbeds respectively and install on fixing base and protection shield, fixing base and protection shield fixedly connected on the bottom plate, and bottom plate fixedly connected with is on the fixed bolster simultaneously, the top fixedly connected with work motor of fixed bolster, one side fixedly connected with of work motor, and work motor is connected with a baffle on the output end of work motor, and one of swing lever is connected with one of the swing lever on the curb plate.

Preferably, the polishing assembly comprises a first connecting plate, a polishing cylinder, a containing box, a second connecting plate, a polishing shaft, a belt pulley, a box body, a fixing sheet, a trapezoid plate, a second side plate, an electric push rod, a first supporting plate, a rotating shaft, a first side box, a second baffle, a connecting sliding rail, supporting feet, a top cover, a workbench, a first telescopic cover, a first screw rod, a supporting column, a limiting plate, supporting legs, a first protective cover, a second telescopic cover, a second screw rod, a limiting sliding rail, a connecting frame, a first fixing block, a third telescopic cover, a second fixing block, a second sliding block, a second supporting plate, a first motor, a fourth telescopic cover, a connecting shell, a sliding seat, a polishing motor, a second side box, a second protective cover, a dust suction pipe and a separating plate.

Preferably, the top fixedly connected with top cap of box body, through second safety cover fixedly connected with motor of polishing on the top cap simultaneously, and the output fixedly connected with of motor of polishing is polished the axle, one side fixedly connected with division board of motor simultaneously polishes, the axle of polishing is connected with through the belt pulley cooperation simultaneously and polishes a section of thick bamboo, and the top fixedly connected with second connecting plate of axle of polishing, the second connecting plate cup joints simultaneously and fixes on the connecting axle, and the epaxial fixedly connected with first connecting plate of connecting, this connecting axle fixedly connected on the top cap simultaneously, and the bottom fixedly connected with dust absorption pipe of box body, the bottom of second safety cover is provided with the slide, and slide sliding connection is on the removal slide rail, this removal slide rail fixed connection is on electric putter simultaneously.

Preferably, the one end fixedly connected with rotation axis of electric putter, the junction of box body and rotation axis is provided with the stationary blade simultaneously, and the other end fixed connection of rotation axis is on the second protective cover, the top fixedly connected with second curb plate and the trapezoidal plate of first backup pad simultaneously, the top fixedly connected with rotation axis of first backup pad simultaneously, and rotate on the rotation axis and be connected with the axle of polishing, the bottom both sides fixedly connected with second side box and the first side box of box body simultaneously, and the bottom fixedly connected with of first side box and second side box is in the first backup pad, the bottom of first backup pad passes through ball nut cooperation and connects on first lead screw, the one end fixed connection of first lead screw is on the second motor simultaneously, second motor fixed connection is in the inside of connecting the shell, the bottom fixed connection of first flexible cover and fourth flexible cover simultaneously is in the second backup pad.

Preferably, the first flexible cover of both ends fixedly connected with and the flexible cover of fourth of first backup pad, the bottom fixedly connected with of connection slide rail is in the second backup pad, sliding connection has first backup pad in the second backup pad simultaneously, the bottom of second backup pad is through the spacing slide rail of the second slider sliding connection who sets up, spacing slide rail fixedly connected with is on the workstation simultaneously, and the top four corners fixedly connected with supporting leg of workstation, and the bottom fixedly connected with supporting leg of supporting leg, horizontal fixedly connected with limiting plate on the supporting leg simultaneously, and the junction fixedly connected with support column of limiting plate and supporting leg, the second backup pad passes through ball nut cooperation and is connected with the second lead screw.

Preferably, one end fixedly connected with first motor of second lead screw, and the other end cooperation of second lead screw is connected with second fixed block and first fixed block, and second fixed block and first fixed block fixed connection are on the workstation simultaneously, and the top both sides of second backup pad pass through link fixedly connected with second flexible cover and the flexible cover of third simultaneously, and the flexible cover of second and the flexible cover of third fixed connection in the both sides of second backup pad, and first motor fixed connection is in the inside of first guard simultaneously, and first guard fixed connection is on the workstation simultaneously.

(III) beneficial effects

The polishing and lifting assembly provided by the utility model has the advantages that: according to the utility model, the lifting assembly and the polishing assembly are arranged, and the polishing assemblies are positioned at two sides of the lifting assembly, so that the polishing station is increased, the polishing efficiency is improved, and meanwhile, the positions of the materials and the polishing cylinder can be adjusted in real time according to actual requirements in the polishing process, so that the polishing treatment is convenient and accurate, and the quality of the polished materials is improved; the dust collection pipe is arranged, so that waste scraps generated by grinding can be collected intensively.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a schematic perspective view of a lifting assembly according to the present utility model;

FIG. 3 is an exploded view of the lift assembly of the present utility model;

FIG. 4 is a schematic perspective view of a sanding assembly of the present utility model;

fig. 5 is an exploded view of the sanding assembly of the present utility model.

In the figure: 1. a lifting assembly; 2. a polishing assembly; 101. a first slider; 102. a fixed bracket; 103. a first side plate; 104. a lifting bracket; 105. a linear slide rail; 106. a rotating ring; 107. a fixing seat; 108. a gear; 109. a lifting chain; 110. a rotating shaft; 111. a protective plate; 112. a connecting ring; 113. a bottom plate; 114. a working motor; 115. a first baffle; 201. a first connection plate; 202. polishing a cylinder; 203. a housing case; 204. a second connecting plate; 205. polishing the shaft; 206. a belt pulley; 207. a case body; 208. a fixing piece; 209. a trapezoidal plate; 210. a second side plate; 211. an electric push rod; 212. a first support plate; 213. a rotation shaft; 214. a first side case; 215. a second baffle; 216. the connecting slide rail; 217. supporting feet; 218. a top cover; 219. a work table; 220. a first telescoping shield; 221. a first screw rod; 222. a support column; 223. a limiting plate; 224. support legs; 225. a first protective cover; 226. a second telescoping shield; 227. a second screw rod; 228. a limit sliding rail; 229. a connecting frame; 230. a first fixed block; 231. a third telescoping shield; 232. a second fixed block; 233. a second slider; 234. a second support plate; 235. a first motor; 236. a fourth telescoping shield; 237. a connection housing; 238. a slide; 239. polishing a motor; 240. a second side case; 241. a second protective cover; 242. a dust collection pipe; 243. a partition plate.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by one of ordinary skill in the art without inventive faculty, are intended to be within the scope of the present utility model, based on the embodiments of the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1-5, an embodiment of the present utility model is provided: the polishing and lifting assembly comprises a lifting assembly 1 and a polishing assembly 2, wherein the number of the polishing assemblies 2 is two, the polishing assembly 2 is matched and connected with the lifting assembly 1, the lifting assembly 1 comprises a first sliding block 101, a fixed support 102, a first side plate 103, a lifting support 104, a linear sliding rail 105, a rotating ring 106, a fixed seat 107, a gear 108, a lifting chain 109, a rotating shaft 110, a protection plate 111, a connecting ring 112, a bottom plate 113, a working motor 114 and a first baffle 115, the two sides of the fixed support 102 are fixedly connected with the linear sliding rail 105, the linear sliding rail 105 is slidingly connected with the first sliding block 101, the first sliding block 101 is fixedly connected with the first side plate 103, the first side plate 103 is fixedly connected with a lifting support 104 through a bolt and a triangle plate, the lifting support 104 is rotationally connected with the lifting chain 109 through a U-shaped seat, the lifting chain 109 is meshed and connected with the gear 108, the gear 108 is sleeved and fixed with a rotating shaft 110, two ends of the rotating shaft 110 are respectively connected with a rotating ring 106 and a connecting ring 112 in a rotating way, the rotating ring 106 and the connecting ring 112 are respectively embedded and installed on a fixed seat 107 and a protection plate 111, the fixed seat 107 and the protection plate 111 are fixedly connected on a bottom plate 113, the bottom plate 113 is fixedly connected on a fixed bracket 102, the top end of the fixed bracket 102 is fixedly connected with a working motor 114, one side of the working motor 114 is fixedly connected with a first baffle 115, the output end of the working motor 114 is rotationally connected with a swinging rod, one end of the swinging rod is rotationally connected on one of the first side plates 103, a polishing assembly 2 comprises a first connecting plate 201, a polishing barrel 202, a containing box 203, a second connecting plate 204, a polishing shaft 205, a belt pulley 206, a box 207, a fixing piece 208, a trapezoidal plate 209, a second side plate 210, an electric push rod 211, the first support plate 212, the rotation shaft 213, the first side case 214, the second baffle 215, the connection slide rail 216, the support leg 217, the top cover 218, the workbench 219, the first telescopic cover 220, the first screw rod 221, the support column 222, the limit plate 223, the support leg 224, the first protective cover 225, the second telescopic cover 226, the second screw rod 227, the limit slide rail 228, the connection frame 229, the first fixing block 230, the third telescopic cover 231, the second fixing block 232, the second slide block 233, the second support plate 234, the first motor 235, the fourth telescopic cover 236, the connection shell 237, the slide seat 238, the polishing motor 239, the second side case 240, the second protective cover 241, the dust suction pipe 242 and the partition plate 243, the top end of the case 207 is fixedly connected with the top cover 218, the polishing motor 239 is fixedly connected with the top cover 218 through the second protective cover 241, and the output end of the polishing motor 239 is fixedly connected with the polishing shaft 205, simultaneously, one side of the polishing motor 239 is fixedly connected with a splitter plate 243, simultaneously, the polishing shaft 205 is connected with the polishing cylinder 202 in a matched manner through the belt pulley 206, the top end of the polishing shaft 205 is fixedly connected with the second connecting plate 204, simultaneously, the second connecting plate 204 is sleeved and fixed on the connecting shaft, the first connecting plate 201 is fixedly connected on the connecting shaft, simultaneously, the connecting shaft is fixedly connected on the top cover 218, the bottom end of the box body 207 is fixedly connected with the dust suction pipe 242, the bottom end of the second protecting cover 241 is provided with a sliding seat 238, the sliding seat 238 is slidingly connected on a movable sliding rail, simultaneously, the movable sliding rail is fixedly connected on the electric push rod 211, one end of the electric push rod 211 is fixedly connected with one end of the rotating shaft 213, simultaneously, the joint of the box body 207 and the rotating shaft 213 is provided with a fixing piece 208, and the other end of the rotating shaft 213 is fixedly connected on the second protecting cover 241, simultaneously, the top end of the first supporting plate 212 is fixedly connected with the second side plate 210 and the trapezoid 209, simultaneously, the top end of the first supporting plate 212 is fixedly connected with a rotating shaft 213, the rotating shaft 213 is rotationally connected with a polishing shaft 205, simultaneously, two sides of the bottom end of the box body 207 are fixedly connected with a second side box 240 and a first side box 214, the bottom ends of the first side box 214 and the second side box 240 are fixedly connected with the first supporting plate 212, the bottom end of the first supporting plate 212 is connected with a first screw rod 221 in a matched manner through a ball nut, simultaneously, one end of the first screw rod 221 is fixedly connected with a second motor, the second motor is fixedly connected with the inside of a connecting shell 237, simultaneously, the bottom ends of a first telescopic cover 220 and a fourth telescopic cover 236 are fixedly connected with a second supporting plate 234, two ends of the first supporting plate 212 are fixedly connected with a first telescopic cover 220 and a fourth telescopic cover 236, the bottom end of a connecting sliding rail 216 is fixedly connected with the second supporting plate 234, simultaneously, the first supporting plate 212 is slidingly connected with the second supporting plate 234, the bottom end of the second supporting plate 234 is slidably connected with a limit sliding rail 228 through a second sliding block 233, the limit sliding rail 228 is fixedly connected with a workbench 219, four corners of the top end of the workbench 219 are fixedly connected with supporting legs 217, the bottom end of each supporting leg 217 is fixedly connected with supporting legs 224, the supporting legs 224 are horizontally and fixedly connected with limit plates 223, the connection parts of the limit plates 223 and the supporting legs 224 are fixedly connected with supporting columns 222, the second supporting plate 234 is matched and connected with a second screw rod 227 through ball nuts, one end of the second screw rod 227 is fixedly connected with a first motor 235, the other end of the second screw rod 227 is matched and connected with a second fixed block 232 and a first fixed block 230, the second fixed block 232 and the first fixed block 230 are fixedly connected with the workbench 219, two sides of the top end of the second supporting plate 234 are fixedly connected with a second telescopic cover 226 and a third telescopic cover 231 through connecting frames 229, the second telescopic cover 226 and the third telescopic cover 231 are fixedly connected to both sides of the second supporting plate 234, and simultaneously the first motor 235 is fixedly connected to the inside of the first protective cover 225, and simultaneously the first protective cover 225 is fixedly connected to the workbench 219;

specifically, when in use, firstly, the lifting operation of the material is completed through the lifting assembly 1, and the lifting assembly 1 only needs to open the working motor 114 in the lifting process, the working of the working motor 114 is utilized to drive the swinging of the swinging rod, and then the first side plate 103 on one side of the fixed support 102 is driven to move, as the lifting chains 109 are connected between the two first side plates 103, and simultaneously the lifting chains 109 are engaged and connected on the gear 108, when the lifting support 104 on one side of the fixed support 102 is in the moving process, the lifting support 104 arranged on the other side of the fixed support 102 is in the descending state, thus completing the material supplementing operation, the cyclic operation is sequentially carried out, and the lifted material is polished by using the polishing assembly 2 arranged, and in the polishing process, the polishing shaft 205, the belt pulley 206 and the polishing barrel 202 are driven to rotate by using the working of the polishing motor 239, and then the polishing operation of the material is completed by using the rotation of the polishing shaft 205, the belt pulley 206 and the polishing barrel 202, and simultaneously, the second support plate 234 and the first support plate 212 can be driven to move, and then the polishing position relationship between the polishing motor 202 and the polishing barrel 202 is driven, and the material can be uniformly collected by using the first dust collection tube 242 which is simultaneously completed by using the rotating and the polishing barrel arranged in the first process.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (6)

1. Polishing and lifting assembly, including lifting assembly (1) and polishing assembly (2), its characterized in that: the number of the polishing assemblies (2) is two, the polishing assemblies (2) are matched and connected with the lifting assemblies (1) at the same time, the lifting assemblies (1) comprise a first sliding block (101), a fixed support (102), a first side plate (103), a lifting support (104), a linear sliding rail (105), a rotating ring (106), a fixed seat (107), a gear (108), a lifting chain (109), a rotating shaft (110), a protection plate (111), a connecting ring (112), a bottom plate (113), a working motor (114) and a first baffle (115), the linear sliding rail (105) is fixedly connected to two sides of the fixed support (102), the linear sliding rail (105) is slidingly connected with the first sliding block (101), the first sliding block (101) is fixedly connected to the first side plate (103), the lifting support (104) is fixedly connected to the first side plate (103) through bolts and the triangular plate, the lifting support (104) is rotatably connected with the lifting chain (109) through a U-shaped seat, the lifting chain (109) is meshed and connected to the gear (108), the rotating shaft (110) is fixedly connected to the gear (108) in a sleeved mode, the rotating shaft (110) is rotatably connected to the two ends of the rotating ring (106) and the connecting ring (112) respectively, and swivel becket (106) and go-between (112) are embedded respectively and are installed on fixing base (107) and protection shield (111), and fixing base (107) and protection shield (111) fixed connection are on bottom plate (113) simultaneously, and bottom plate (113) fixed connection is on fixed bolster (102), and the top fixedly connected with work motor (114) of fixed bolster (102) simultaneously, one side fixedly connected with first baffle (115) of work motor (114), and rotate on the output of work motor (114) and be connected with the swinging arms, and the one end rotation of swinging arms is connected on one of them first curb plate (103).

2. The sanding and lifting assembly of claim 1, wherein: the polishing assembly (2) comprises a first connecting plate (201), a polishing cylinder (202), a containing box (203), a second connecting plate (204), a polishing shaft (205), a belt pulley (206), a box body (207), a fixing piece (208), a trapezoid plate (209), a second side plate (210), an electric push rod (211), a first supporting plate (212), a rotating shaft (213), a first side box (214), a second baffle (215), a connecting sliding rail (216), supporting feet (217), a top cover (218), a workbench (219), a first telescopic cover (220), a first screw rod (221), a supporting column (222), a limiting plate (223), supporting legs (224), a first protective cover (225), a second telescopic cover (226), a second screw rod (227), a limiting sliding rail (228), a connecting frame (229), a first fixing block (230), a third telescopic cover (231), a second fixing block (232), a second sliding block (233), a second supporting plate (234), a first motor (235), a fourth telescopic cover (236), a connecting shell (237), a sliding seat (238), a polishing motor (239), a second side box (241) and a second protective cover (241), A dust suction pipe (242) and a partition plate (243).

3. The sanding and lifting assembly of claim 2, wherein: the top fixedly connected with top cap (218) of box body (207), simultaneously through second safety cover (241) fixedly connected with motor (239) of polishing on top cap (218), and the output fixedly connected with motor (205) of polishing, one side fixedly connected with division board (243) of motor (239) of polishing simultaneously, motor (205) are connected with section of thick bamboo (202) of polishing through belt pulley (206) cooperation, and the top fixedly connected with second connecting plate (204) of motor (205) of polishing, simultaneously second connecting plate (204) cup joint the fixing on the connecting axle, and fixedly connected with first connecting plate (201) on the connecting axle, simultaneously this connecting axle fixedly connected with dust absorption pipe (242) on top cap (218), and the bottom fixedly connected with dust absorption pipe (242) of box body (207), the bottom of second safety cover (241) is provided with slide (238), and slide (238) sliding connection is on the removal slide rail, simultaneously this removal slide rail fixedly connected on electric putter (211).

4. A sanding and lifting assembly as defined in claim 3, wherein: one end fixedly connected with rotation axis (213) of electric putter (211), the junction of box body (207) and rotation axis (213) is provided with stationary blade (208) simultaneously, and the other end fixed connection of rotation axis (213) is on second safety cover (241), the top fixedly connected with second curb plate (210) and trapezoidal board (209) of first backup pad (212) simultaneously, the top fixedly connected with rotation axis (213) of first backup pad (212) simultaneously, and rotate on rotation axis (213) and be connected with grinding shaft (205), the bottom both sides fixedly connected with second side box (240) and first side box (214) of box body (207) simultaneously, and the bottom fixed connection of first side box (214) and second side box (240) is on first backup pad (212), the bottom of first backup pad (212) is on first lead screw (221) through ball nut cooperation connection, the one end fixed connection of first lead screw (221) is on the second motor simultaneously, the inside of second motor fixed connection at connection shell (237), the bottom fixed connection of first flexible cover (220) and fourth flexible cover (236) is on second backup pad (234) simultaneously.

5. The sanding and lifting assembly of claim 4, wherein: the utility model discloses a flexible cover of both ends fixedly connected with first flexible cover (220) and fourth flexible cover (236) of first backup pad (212), the bottom fixed connection of connection slide rail (216) is on second backup pad (234), sliding connection has first backup pad (212) on second backup pad (234) simultaneously, the bottom of second backup pad (234) is through the second slider (233) sliding connection that sets up spacing slide rail (228), spacing slide rail (228) fixedly connected with is on workstation (219) simultaneously, and the top four corners fixedly connected with supporting legs (217) of workstation (219), and the bottom fixedly connected with supporting leg (224) of supporting legs (217), horizontal fixedly connected with limiting plate (223) on supporting leg (224) simultaneously, and the junction fixedly connected with support column (222) of limiting plate (223) and supporting leg (224), second backup pad (234) are connected with second lead screw (227) through ball nut cooperation.

6. The sanding and lifting assembly of claim 5, wherein: one end fixedly connected with first motor (235) of second lead screw (227), and the other end cooperation of second lead screw (227) is connected with second fixed block (232) and first fixed block (230), second fixed block (232) and first fixed block (230) fixed connection are on workstation (219) simultaneously, the top both sides of second backup pad (234) are through link (229) fixedly connected with second flexible cover (226) and third flexible cover (231), and second flexible cover (226) and the both sides of third flexible cover (231) fixed connection in second backup pad (234), first motor (235) fixed connection is in the inside of first guard (225) simultaneously, first guard (225) fixed connection is on workstation (219) simultaneously.