CN218696468U

CN218696468U - Automatic go up lathe of unloading

Info

Publication number: CN218696468U
Application number: CN202222548848.0U
Authority: CN
Inventors: 刘志斌; 叶国能; 李玉柳; 梁铠; 伍志成; 冯志江
Original assignee: Guangdong Kejie Technology Co Ltd
Current assignee: Guangdong Kejie Technology Co Ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2023-03-24
Anticipated expiration: 2032-09-23

Abstract

The utility model relates to a machine tool capable of automatically feeding and discharging materials, which comprises a machine tool and a feeding and discharging device; a machining channel is arranged in the machine tool; the feeding and discharging device comprises a rack and a portal frame; the gantry is arranged on one side of the machine tool, a conveying line is arranged at the top of the frame, and the gantry spans the conveying line and is arranged on the frame; a transverse beam of the portal frame is slidably provided with a transverse moving mechanism, the transverse moving mechanism is provided with a longitudinal moving mechanism, and the transverse moving mechanism can drive the longitudinal moving mechanism to extend into a processing channel of the machine tool; and the longitudinal moving mechanism is provided with a sucker, and the sucker is used for picking and placing workpieces from the processing channel of the machine tool or the conveying line. The utility model discloses effectively solve the problem of unloading dry-wet separation on the lathe, and easily control, low in manufacturing cost.

Description

Automatic go up lathe of unloading

Technical Field

The utility model relates to a technical field of unloading on the lathe especially relates to an automatic lathe of unloading of going up.

Background

Machine tools are important devices for industrial manufacturing. Most of existing machine tools are provided with 6-degree-of-freedom mechanical arms for loading and unloading workpieces to be machined and machined workpieces so as to achieve machining automation. However, because of the structural design and installation form of the conventional truss type robot arm, the robot arm needs to be installed near a machining channel in a machine tool, so that cutting fluid used in workpiece machining and waste scraps generated in machining can splash to the robot arm, affect the operation of the robot arm, and even damage the robot arm. In addition, the 6-degree-of-freedom mechanical arm is high in cost and needs a corresponding control system matched with the mechanical arm, and the production cost of an enterprise is obviously greatly increased.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model aims at providing an automatic lathe of unloading of going up, its operational environment that can improve when unloading in the automation, and low in manufacturing cost.

The utility model discloses a realize through following technical scheme:

a machine tool capable of automatically feeding and discharging comprises a machine tool and a feeding and discharging device; a machining channel is arranged in the machine tool; the feeding and discharging device comprises a rack and a portal frame; the gantry frame is arranged on the machine frame and spans the conveying line; a transverse beam of the portal frame is slidably provided with a transverse moving mechanism, the transverse moving mechanism is provided with a longitudinal moving mechanism, and the transverse moving mechanism can drive the longitudinal moving mechanism to extend into a processing channel of the machine tool; and the longitudinal moving mechanism is provided with a sucker, and the sucker is used for picking and placing workpieces from the processing channel of the machine tool or the conveying line.

Compared with the prior art, the utility model discloses a set up the unloader on the linear axis and replace 6 degrees of freedom arms on the lathe outside, make blank work piece and finished product all place in the lathe outside, make it not receive the influence of cutting fluid, effectively solve the problem of unloading dry-wet separation on the lathe, and easily control, low in manufacturing cost.

Further, the lateral moving mechanism comprises a first sliding plate, a second sliding plate and a linkage component; the first sliding plate is arranged on the cross beam and is transversely connected with the cross beam in a sliding manner; the second sliding plate is arranged on the first sliding plate and is transversely and slidably connected with the first sliding plate; the linkage assembly is respectively and fixedly connected with the first sliding plate and the second sliding plate, so that the first sliding plate is driven to synchronously and transversely slide when transversely moving.

Furthermore, the linkage assembly comprises a synchronous belt, two synchronous wheels matched with the synchronous belt and two clamping blocks; the two synchronous wheels are respectively arranged on two sides of the top of the first sliding block along the length direction of the first sliding block, and are in transmission connection through the synchronous belt; the two clamping blocks are respectively fixed on the cross beam and the second sliding plate and respectively clamp the synchronous belt.

Furthermore, a first transverse guide rail is arranged on the side face, opposite to the cross beam, of the first sliding plate, and a first transverse sliding block matched with the first transverse guide rail is arranged at the corresponding position of the cross beam; the first sliding plate is provided with a second transverse guide rail, the second sliding plate comprises a connecting part and an installation part, and a second transverse sliding block matched with the second transverse guide rail is arranged at the position, right opposite to the second transverse guide rail, of the connecting part.

Further, the longitudinal moving mechanism comprises a longitudinal telescopic cylinder, a transverse adjusting cylinder and a sucker connecting plate; the longitudinal telescopic cylinder is arranged on the mounting part of the second sliding plate and is provided with a telescopic shaft, and the transverse adjusting cylinder is fixedly connected and fixed on the telescopic shaft; the transverse adjusting cylinder is provided with an output shaft which can move transversely, and the sucker connecting plate is horizontally fixed on the output shaft of the transverse adjusting cylinder; the sucking disc is fixed on the sucking disc connecting plate, just the head orientation of sucking disc the transfer chain.

Furthermore, the number of the sucker connecting plates is two, the transverse adjusting cylinder is provided with two output shafts which are parallel to each other and can move in opposite directions, and the two sucker connecting plates are horizontally fixed on the two output shafts of the transverse adjusting cylinder respectively.

Further, the number of the longitudinal moving mechanisms is two, and the two longitudinal moving mechanisms are arranged on the mounting part of the second sliding plate in parallel.

Furthermore, the machine tool for automatic feeding and discharging also comprises two material tray lifting mechanisms, wherein the two material tray lifting mechanisms are respectively arranged at the upstream and the downstream of the portal frame along the conveying line; the material tray lifting mechanism comprises two lifting frames and two lifting cylinders which are respectively arranged at two sides of the conveying line, the lifting frames comprise a tray carrying part for placing the material tray and a supporting part for supporting the tray carrying part, the supporting part is vertical to the top of the rack, and the tray carrying part is horizontally arranged at the upper end of the supporting part; the lifting cylinder is provided with an output shaft which is fixedly connected with the lower end of the supporting part, and the lifting cylinder is used for driving the supporting part to ascend or descend along the vertical direction.

Furthermore, the top of each tray-carrying part is respectively provided with a positioning block to limit the position of the tray placed on the tray-carrying part.

Further, the tray lifting mechanism further comprises a linear bearing, and the linear bearing is slidably sleeved on the supporting part to guide the supporting part to move up and down along the vertical direction.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural view of the automatic loading and unloading machine tool of the present invention;

FIG. 2 is a schematic structural view of an upper and lower feeding device of a first embodiment of the automatic feeding and discharging machine tool of the present invention;

FIG. 3 is a schematic structural view of a linkage assembly of the first embodiment of the automatic loading and unloading machine tool of the present invention;

FIG. 4 is a schematic structural view of a longitudinal moving mechanism in a first embodiment of the automatic loading and unloading machine tool of the present invention;

FIG. 5 is a schematic structural view of an upper and lower feeding device of a second embodiment of the automatic feeding and discharging machine tool of the present invention;

reference numerals: 10-a machine tool, 102-a workbench in a machining channel of the machine tool, 20-a loading and unloading device, 22-a rack, 221-a conveying line, 2211-a guide rail, 24-a portal frame, 24 a-a cross beam, 24 b-a vertical column, a sliding groove of 241-a cross beam, 242-a transverse moving mechanism, 2421-a first sliding plate, 2421 a-a first transverse guide rail, 2421 b-a first transverse sliding block, 2421 c-a second transverse guide rail, 2421 d-a second transverse sliding block, 2422-a second sliding plate, a connecting part of 2422 a-a second sliding plate, a mounting part of 2422 b-a second sliding plate, 2423-a linkage component, 2423 a-a synchronous belt, 2423 b-a synchronous wheel, 2423 c-a clamping block, 243-a transverse driving mechanism, 2431-a transverse screw rod, 2433-a transverse driving motor, 244-a longitudinal moving mechanism, 2441-a longitudinal telescopic cylinder, 2442-a transverse adjusting cylinder, 2443-a suction cup, a connecting plate, 26-a tray lifting mechanism, 261-a lifting and a positioning block, 30-a workpiece to-be machined.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1-3, fig. 1-3 show a specific structure of a first embodiment of the automatic loading and unloading machine tool of the present invention, which includes a machine tool 10 and an loading and unloading device 20; a processing channel is arranged in the machine tool 10; the loading and unloading device 20 comprises a frame 22 and a portal frame 24. The frame 22 is disposed on one side of the machine tool 10 close to the machining passage, and specifically includes a support platform 221 and two triangular supports 222, the triangular supports 222 are fixed in parallel on one side of the machine tool 10, and the support platform 221 is horizontally disposed on the two triangular supports 222. The top of the frame 22 is provided with a conveying line 221, and the conveying line 221 is provided with a guide rail 2200 parallel to the extending direction of the conveying line 221. Gantry 24 spans conveyor line 221 and is disposed atop gantry 22. The beam 24a of the gantry 24 is provided with a lateral moving mechanism 242 sliding on one side surface in the width direction thereof, wherein the lateral moving direction of the lateral moving mechanism 242 is perpendicular to the extending direction of the guide rail 2200. The transverse moving mechanism 242 is provided with two longitudinal moving mechanisms 244, and the longitudinal moving mechanisms 244 are provided with suction cups 246 having heads facing the conveying line 221 and used for picking and placing the workpiece to be processed and the processed workpiece.

Specifically, the lateral moving mechanism 242 includes a first slide plate 2421, a second slide plate 2422, and a linkage assembly 2423. The first sliding plate 2421 is specifically a rectangular plate, and one side surface of the first sliding plate 2421, which faces the cross beam 24a, is provided with two first transverse guide rails 2421a which are parallel to the top surface of the rack 22, and the first transverse guide rails 2421a specifically include two transverse single rails; and a corresponding position on the cross beam 24a is provided with a first cross slide 2421b adapted to the first cross guide 2421 a. The top of the first sliding plate 2421 is further provided with a second cross guide 2421c parallel to the first cross guide 2421 a; the second sliding plate 2422 is specifically an inverted L-shaped plate, and includes a connection part 2422a and a mounting part 2422b, and a second transverse sliding block 2421d adapted to the second transverse guide 2421c is disposed at a position where the connection part 2422a is opposite to the second transverse guide 2421 c. Linkage assembly 2423 includes timing belt 2423a, two timing wheels 2423b adapted to timing belt 2423a, and two clamping blocks 2423c. The two synchronous wheels 2423b are respectively arranged at two sides of the top of the first sliding plate 2421 along the length direction thereof, and the synchronous belts 2423a are sleeved at the outer sides of the two synchronous wheels 2423b so as to realize the transmission connection of the two synchronous wheels 2423 b; the two holding blocks 2423c are fixed to the cross beam 24a and the second slide plate 2422, respectively, and hold the timing belts 2423a, respectively.

Further, the first slide plate 2421 is laterally moved by a lateral driving mechanism (not shown). A transverse driving mechanism (not shown) is provided on the cross beam 24a, and includes a transverse screw 2431, a transverse screw slider (not shown), and a transverse driving motor 2424. Specifically, the transverse screw 2431 is disposed on a side of the cross beam 24a opposite to the first slide plate 2421, and is parallel to the first transverse guide rail 2421 a; a transverse screw rod sliding block (not shown) is sleeved on the transverse screw rod 2431 and is fixedly connected with the first sliding plate 2421; the transverse driving motor 2433 is a servo motor, and has an output shaft fixedly connected to one end of the transverse screw 2431 to drive a transverse screw slider (not shown) to move along the transverse screw 2431, so as to drive the first sliding plate 2421 to move transversely. Preferably, the side of the beam 24a facing the first sliding plate is provided with a sliding slot 241, and a transverse driving mechanism (not shown) can be embedded in the sliding slot 241 to save space.

When a transverse driving mechanism (not shown) drives the first slide plate 2421 to slide transversely, the first slide plate 2421 and the cross beam 24a are relatively displaced, and since a clamping block 2423c provided at the cross beam 24a clamps the timing belt 2423a, the timing belt 2423a rotates with the relative displacement between the first slide plate 2421 and the cross beam 24 a; since the clamping block 2423c of the second slide plate 2422 clamps the timing belt 2423a, when the timing belt 2423a rotates, the second slide plate 2422 is synchronously driven to move transversely.

Referring to fig. 4, the longitudinal moving mechanism 244 includes a telescopic cylinder 2441, a transverse adjusting cylinder 2442 and two suction cup connecting plates 2443. Specifically, the telescopic cylinder 2441 has a telescopic shaft fixed thereto, and the telescopic cylinder 2441 is fixed to a side of the second slide plate 2422 facing away from the first slide plate 2421 such that the telescopic shaft faces downward. The transverse adjusting cylinder 2442 has two output shafts which are parallel to each other and can move in opposite directions, and the transverse adjusting cylinder 2442 is fixed to the front end of the telescopic shaft of the telescopic cylinder 2441 so that the output shaft of the transverse adjusting cylinder 2442 faces downward. Two sucking disc connecting plates 2443 are respectively and horizontally fixed at the front ends of two output shafts of the transverse adjusting cylinder 2442. The suction cups 246 are respectively fixedly arranged on the side surfaces of the suction cup connecting plates 2443, which face away from the transverse adjusting air cylinders 2442, and the heads of the suction cups 246 face downwards. The longitudinal movement mechanism 244 further includes a vacuum unit (not shown) in communication with the suction cup 246 for cooperating with the suction cup 246 to pick and place the workpiece. When the suction cup 246 is in contact with the workpiece, a vacuum is drawn on the cavity formed by the suction cup 246 and the workpiece, thereby sucking the workpiece, and when a vacuum unit (not shown) vents the cavity formed by the suction cup 246 and the workpiece, the workpiece is lowered. The vacuum unit (not shown) specifically includes a vacuum pump.

Referring to fig. 5, fig. 5 shows a specific structure of a second embodiment of the automatic loading and unloading machine tool of the present invention, and as an optimized solution to the above technical solution, the automatic loading and unloading machine tool of the present embodiment further includes tray lifting mechanisms 26 respectively disposed at the upstream and downstream of the gantry 24 along the conveying line 221.

Specifically, the tray lifting mechanism 26 includes lifting frames 261 provided on both sides of the conveying line 221, respectively, and the lifting frames include a tray loading portion 261a and a support portion 261b. The supporting portion 261 is two supporting rods perpendicular to the top of the rack 10, and the tray portion 261a is a long plate horizontally fixed at one end of the supporting portion 261b and parallel to the extending direction of the conveying line 221. The elevating cylinder (not shown) has an output shaft fixedly connected to the other end of the supporting portion 261b to drive the elevating frame 261 to be elevated or lowered in a vertical direction. The two ends of the top of the tray loading part 261a along the extension direction of the conveying line 221 are respectively provided with a positioning block 262, and the distance between the positioning blocks 262 on the two lifting frames is larger than the width of the tray, so as to limit the position of the tray placed on the tray loading part 261 a.

Further, the tray lifting mechanism further includes a linear bearing 263, and the linear bearing 263 is slidably sleeved on the supporting portion 261b to guide the movement of the supporting portion 261b along the vertical direction.

In operation of the preferred machine, the trays are placed on the lifting frame 261 of the tray lifting mechanism 26 upstream of the conveyor line 221, the lifting frame 261 is lowered until the bottoms of the trays 30 contact the linear module (not shown) on the guide rail 2211, and the linear module (not shown) drives the trays 30 to move along the guide rail 2211 to the gantry 24. When the tray 30 moves to be installed below the two longitudinal moving mechanisms 244 (the first longitudinal moving mechanism and the second longitudinal moving mechanism, respectively), the first horizontal adjusting cylinder of the first longitudinal moving mechanism adjusts the position between the two suction cup connecting plates 2443 according to the distance between the workpieces in the tray, thereby adjusting the distance between the suction cups 246. After the completion, the first longitudinal stretching cylinder drives the first transverse adjusting cylinder to move downwards along the vertical direction, so that the suction cups 246 on the two suction cup connecting plates 2443 are in contact with two adjacent workpieces 32 to be processed in the tray 30, and at this time, the vacuum pumping unit (not shown) is started, so that the suction cups 246 absorb the workpieces 32 to be processed. After the suction, the longitudinal stretching cylinder 2441 of the first longitudinal moving mechanism drives the suction cup 246 to reset. Next, the transverse driving motor 2433 drives the first sliding plate 2421 to move transversely, and drives the second sliding plate 2422 to move transversely synchronously through the linkage assembly 2423, so that the suction cups 246 on the two longitudinal moving mechanisms 244 extend into the processing channel of the machine tool 10, two working tables 102 are arranged in the processing channel, namely a first working table and a second working table, and the first working table and the second working table are respectively provided with a processed workpiece. After the two longitudinal moving mechanisms 244 are moved into the processing channel, the two suction cup connecting plates 2443 of the second longitudinal moving mechanism are aligned with the first worktable and the second worktable, and then the suction cups 246 on the two suction cup connecting plates 2443 are moved downward in the vertical direction at the same time, and by the vacuum pumping action of the vacuum pumping unit (not shown), the processed workpieces on the first worktable and the second worktable are respectively adsorbed. After the adsorption, the second longitudinal moving mechanism is reset. Next, the two longitudinal moving mechanisms 244 move laterally so that the two suction cup attachment plates 2443 of the first longitudinal moving mechanism are aligned with the first and second work tables, respectively, and then the suction cups 246 on the two suction cup attachment plates move downward in the vertical direction at the same time, and place the workpiece 32 to be machined on the first and second work tables, respectively, to machine the workpiece 32 to be machined. After the placement, the first longitudinal moving mechanism is reset. Then, the transverse driving mechanism 243 drives the transverse moving mechanism 242 to transversely move again, so that the first longitudinal moving mechanism and the second longitudinal moving mechanism move to the upper part of the conveying line 221, the two sucker connecting plates 2443 of the first longitudinal moving mechanism are aligned with the workpiece 32 to be processed on the material tray 30, and the second longitudinal moving mechanism is aligned with the vacant position on the material tray 30; then, the two longitudinal moving mechanisms 244 simultaneously move downward in the vertical direction, wherein the second longitudinal moving mechanism puts the processed workpiece into the vacant position of the tray 30, and the first longitudinal moving mechanism re-adsorbs the workpiece 32 to be processed from the tray 30. The above operation is repeated until the tray 30 is filled with the processed work pieces, the tray 30 is moved by the linear module (not shown) along the conveying line 221 to the tray lifting mechanism 26 located at the downstream of the gantry 24, the lifting frame 261 in the tray lifting mechanism 26 is lifted, and finally the tray 30 located at the downstream tray lifting mechanism 26 is removed.

Compared with the prior art, the feeding and discharging device of the linear shaft feeding and discharging device is arranged on the outer side of the machine tool to replace a mechanical arm with 6 degrees of freedom, so that a blank workpiece and a finished workpiece are both placed on the outer side of the machine tool, the feeding and discharging device is not influenced by cutting fluid, the problem of dry-wet separation of feeding and discharging of the machine tool is effectively solved, and the manufacturing cost is low and the control is easy; through setting up the flexible lateral shifting mechanism of two-stage, realize big stroke lateral shifting, simultaneously through setting up two longitudinal movement mechanism, make lateral shifting mechanism lateral shifting once, can accomplish simultaneously and go up the unloading, effectively improve the efficiency of going up the unloading, and save space and cost. In addition, by arranging the material tray lifting mechanism at the upper stream and the lower stream of the portal frame along the conveying line, the material changing is not required to be stopped, and the continuous production can be realized.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, to those skilled in the art, changes and modifications may be made without departing from the spirit of the invention, and it is intended that the invention also encompass such changes and modifications.

Claims

1. The utility model provides an automatic lathe of unloading, its characterized in that includes:

a machine tool and a loading and unloading device; a machining channel is arranged in the machine tool; the feeding and discharging device comprises a rack and a portal frame; the gantry is arranged on one side of the machine tool, a conveying line is arranged at the top of the frame, and the gantry spans the conveying line and is arranged on the frame;

a transverse beam of the portal frame is slidably provided with a transverse moving mechanism, the transverse moving mechanism is provided with a longitudinal moving mechanism, and the transverse moving mechanism can drive the longitudinal moving mechanism to extend into a processing channel of the machine tool;

and the longitudinal moving mechanism is provided with a sucker, and the sucker is used for taking and placing workpieces from the processing channel of the machine tool or the conveying line.

2. The automatic loading and unloading machine tool of claim 1,

the transverse moving mechanism comprises a first sliding plate, a second sliding plate and a linkage component;

the first sliding plate is arranged on the cross beam and is transversely connected with the cross beam in a sliding manner;

the second sliding plate is arranged on the first sliding plate and is transversely and slidably connected with the first sliding plate;

the linkage assembly is respectively and fixedly connected with the first sliding plate and the second sliding plate, so that the first sliding plate is driven to synchronously and transversely slide when transversely moving.

3. The automatic loading and unloading machine tool of claim 2,

the linkage assembly comprises a synchronous belt, two synchronous wheels matched with the synchronous belt and two clamping blocks;

the two synchronous wheels are respectively arranged on two sides of the top of the first sliding block along the length direction of the first sliding block, and are in transmission connection through the synchronous belt;

the two clamping blocks are respectively fixed on the cross beam and the second sliding plate and respectively clamp the synchronous belt.

4. The automatic loading and unloading machine tool of claim 3,

a first transverse guide rail is arranged on the side face, opposite to the cross beam, of the first sliding plate, and a first transverse sliding block matched with the first transverse guide rail is arranged at the corresponding position of the cross beam;

the first sliding plate is provided with a second transverse guide rail, the second sliding plate comprises a connecting part and an installation part, and a second transverse sliding block matched with the second transverse guide rail is arranged at the position, right opposite to the second transverse guide rail, of the connecting part.

5. The automatic loading and unloading machine tool of claim 4,

the longitudinal moving mechanism comprises a longitudinal telescopic cylinder, a transverse adjusting cylinder and a sucker connecting plate;

the longitudinal telescopic cylinder is arranged on the mounting part of the second sliding plate and is provided with a telescopic shaft, and the transverse adjusting cylinder is fixedly connected and fixed on the telescopic shaft;

the transverse adjusting cylinder is provided with an output shaft which can move transversely, and the sucker connecting plate is horizontally fixed on the output shaft of the transverse adjusting cylinder;

the sucking disc is fixed on the sucking disc connecting plate, just the head orientation of sucking disc the transfer chain.

6. The automatic loading and unloading machine tool of claim 5,

the two sucker connecting plates are arranged, the transverse adjusting cylinder is provided with two output shafts which are parallel to each other and can move in opposite directions, and the two sucker connecting plates are horizontally fixed on the two output shafts of the transverse adjusting cylinder respectively.

7. The automatic loading and unloading machine tool of claim 5,

the two longitudinal moving mechanisms are arranged on the mounting part of the second sliding plate in parallel.

8. The automatic loading and unloading machine tool as claimed in any one of claims 1 to 7,

the two material tray lifting mechanisms are respectively arranged at the upstream and the downstream of the portal frame along the conveying line;

the material tray lifting mechanism comprises two lifting frames and two lifting cylinders which are respectively arranged at two sides of the conveying line, the lifting frames comprise a tray carrying part for placing the material tray and a supporting part for supporting the tray carrying part, the supporting part is vertical to the top of the rack, and the tray carrying part is horizontally arranged at the upper end of the supporting part;

the lifting cylinder is provided with an output shaft which is fixedly connected with the lower end of the supporting part, and the lifting cylinder is used for driving the supporting part to ascend or descend along the vertical direction.

9. The automatic loading and unloading machine tool of claim 8,

and the top of each tray carrying part is respectively provided with a positioning block so as to limit the position of the tray placed on the tray carrying part.

10. The automatic loading and unloading machine tool of claim 9,

the tray lifting mechanism further comprises a linear bearing, and the linear bearing is slidably sleeved on the supporting part to guide the supporting part to move up and down along the vertical direction.