CN113601358B

CN113601358B - Automatic sand paper loading and unloading device of grinding machine

Info

Publication number: CN113601358B
Application number: CN202111003240.3A
Authority: CN
Inventors: 郭洪江; 张志勇; 杜小兵
Original assignee: Clp Pengcheng Intelligent Equipment Co ltd
Current assignee: Clp Pengcheng Intelligent Equipment Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-06-17
Anticipated expiration: 2041-08-30
Also published as: CN113601358A

Abstract

The invention discloses an automatic sand paper loading and unloading device of a grinding machine, which comprises a base, wherein a sand paper loading device for loading new sand paper and a sand paper loading and unloading device for replacing the sand paper on the grinding machine are arranged on the base; the clamp opening and closing cylinders are symmetrically arranged on two sides of the abrasive paper loading and unloading station to open and close an abrasive paper clamp on the sander, and an edge folding mechanism for folding the side edge of the abrasive paper and facilitating clamping of the sander is arranged below the abrasive paper transferring and sucking table; according to the invention, the clamp opens and closes the air cylinder to open and close the abrasive paper clamp of the polisher, the abrasive paper loading device and the abrasive paper unloading device automatically disassemble and install the abrasive paper, manual operation is not needed, the difficulty of replacing the abrasive paper is reduced, the working efficiency is improved, automatic assembly is realized, and the working efficiency is improved.

Description

Automatic sand paper loading and unloading device of grinding machine

Technical Field

The invention relates to the technical field of grinding and polishing, in particular to an automatic sand paper loading and unloading device of a grinding machine.

Background

In order to ensure the reliability of the fingerprint chip coating process, the chip epoxy resin needs to be polished. At present, a handheld grinding machine is mainly adopted in the market to grind and polish the chip epoxy resin so as to meet the coating requirement. The prior handheld grinding machine is difficult to assemble and disassemble abrasive paper; the method comprises the following steps that (1) a clamp is arranged at one end of two clamps, the sand paper clamp at one end is manually opened by hand, sand paper is placed in the clamp, the clamp is opened again to clamp the sand paper, and the clamp at the other end is opened again to clamp the sand paper; force is required to be applied to break and clamp, the labor intensity of manual operation is high, the installed abrasive paper is not tight, and the abrasive paper needs to be repeatedly pressed to enable the abrasive paper to be tightly installed and be flat; unload the abrasive paper and also break off with the fingers and thumb and clip and take out abrasive paper, it is inconvenient to load and unload abrasive paper manual operation like this, influences work efficiency.

Disclosure of Invention

The technical purpose is as follows: aiming at the problem that the existing sander sand paper is inconvenient to assemble and disassemble, the invention discloses an automatic sander sand paper assembling and disassembling device which solves the problem that manual operation for assembling and disassembling sand paper is inconvenient and realizes automatic sander sand paper assembling and disassembling.

The technical scheme is as follows: in order to achieve the technical purpose, the invention adopts the following technical scheme:

an automatic sand paper loading and unloading device of a grinding machine comprises a base, wherein a sand paper loading device used for loading new sand paper and a sand paper loading and unloading device used for replacing the sand paper on the grinding machine are arranged on the base, the sand paper loading and unloading device comprises a clamp opening and closing cylinder, a sand paper unloading device and a sand paper transferring and sucking table used for conveying the new sand paper of the sand paper loading device to a sand paper installation station, and the sand paper transferring and sucking table is in sliding connection with the base; anchor clamps open and shut cylinder symmetry and set up in the both sides of abrasive paper loading and unloading station, carry out opening and closing that the abrasive paper pressed from both sides on the polisher, move to carry at abrasive paper and inhale a below setting of platform and be used for the tight hem mechanism of polisher clamp of being convenient for of abrasive paper side hem, press from both sides tightly abrasive paper by the abrasive paper of polisher behind the abrasive paper hem.

Preferably, the abrasive paper feeding device comprises a mounting plate which is arranged on one side of the base and is vertical to the base, the abrasive paper feeding device is arranged on the inner side surface of the mounting plate, the abrasive paper feeding device comprises an abrasive paper feeding box and an abrasive paper taking mechanism, one side of the abrasive paper feeding box, which is close to the abrasive paper taking mechanism, is provided with an abrasive paper outlet, and the abrasive paper feeding box is provided with an abrasive paper arranging mechanism for arranging and conveying abrasive paper;

the abrasive paper taking mechanism comprises a first rotating shaft and a second rotating shaft which are arranged along the direction vertical to the surface of a mounting plate, one end of the first rotating shaft is rotatably connected with the mounting plate through a fixed bearing, the other end of the first rotating shaft is connected with a linear bearing, a linear lifting shaft vertical to the side surface of a sand paper outlet of an abrasive paper feeding box is arranged in the linear bearing in a penetrating manner, one end of the linear lifting shaft is connected with the linear bearing in a sliding manner, an abrasive paper taking sucker is fixed at the other end of the linear lifting shaft, and the disc surface of the abrasive paper taking sucker is opposite to the sand paper outlet of the abrasive paper feeding box; second pivot one end is connected with the mounting panel through moving bearing, and the other end and sharp lift axle fixed connection are equipped with on the mounting panel and are used for moving the gliding first slide opening of bearing and get the abrasive paper cylinder, get the slip of abrasive paper cylinder drive mobile bearing, drive and get abrasive paper sucking disc and sharp lift axle and rotate along with first pivot is downwards, place abrasive paper and move the carrying suction table on the surface at abrasive paper.

Preferably, the ends, close to the inner side, of the sandpaper feeding box and the first sliding hole are both inclined downwards, and the inclination angle of the first sliding hole is larger than that of the sandpaper feeding box.

Preferably, the sand paper arranging mechanism comprises a push plate assembly arranged on one side opposite to the sand paper outlet and a pressing plate arranged above the sand paper outlet for arranging sand paper, wherein the pressing plate is symmetrically arranged above the sand paper outlet; the incline direction of push pedal subassembly along abrasive paper material loading box and the bottom plate sliding connection of abrasive paper material loading box, the push pedal subassembly is including setting up the first push pedal in the bottom plate below of abrasive paper material loading box, sliding guide and bottom plate sliding connection are passed through to first push pedal, there is the second push pedal in the bilateral symmetry of first push pedal, the second push pedal sets up with the bottom plate is perpendicular, the upper end of second push pedal is located abrasive paper material loading box after passing the bottom plate in, along with first push pedal synchronous slip, set up on the bottom plate and be used for the gliding second sliding opening of second push pedal, be connected with the third push pedal between the side that two second push pedals are close to abrasive paper place one side, the face of third push pedal and the terminal surface laminating of abrasive paper, it removes to go out abrasive paper mouth to push away abrasive paper under the action of gravity at abrasive paper material loading in-process.

Preferably, the upper surface of the sand paper transferring and sucking table is a sand paper adsorption surface, a supporting plate is arranged below the sand paper transferring and sucking table, the sand paper transferring and sucking table is connected with the base in a sliding mode through the supporting plate, the edge folding mechanism comprises a sand paper folding plate surrounding the periphery of the sand paper adsorption surface and a sand paper folding cylinder used for pushing the sand paper folding plate to move up and down, the sand paper folding cylinder is fixed on the supporting plate, a guide rod is arranged on the supporting plate in the direction perpendicular to the plate surface, the bottom of the guide rod is fixedly connected with the supporting plate, and the top of the guide rod penetrates through the sand paper folding plate.

Preferably, the base is provided with a sand paper transferring cylinder for driving the sand paper transferring suction table to slide, and the supporting plate is pushed by the sand paper transferring cylinder to move.

Preferably, the sand paper unloading device is arranged at the end part of the sand paper transferring and sucking table in the sliding direction and comprises a sand paper unloading cylinder and a sand paper unloading sucking plate, the sand paper unloading cylinder is arranged in the sliding direction perpendicular to the sand paper transferring and sucking table, the sand paper unloading sucking plate is of a door-shaped structure, the side surface of the sand paper unloading sucking plate is fixedly connected with the sand paper unloading cylinder, a sucking disc is arranged on the surface of the sand paper unloading sucking plate, the sand paper unloading cylinder drives the sand paper unloading sucking plate to rotate, and when sand paper on a grinding machine is disassembled, the sand paper is sucked through the sucking disc.

Has the advantages that: the automatic sand paper loading and unloading device for the grinding machine provided by the invention has the following beneficial effects:

1. according to the invention, the clamp opens and closes the air cylinder to open and close the abrasive paper clamp of the grinding machine, the abrasive paper loading device and the abrasive paper unloading device are used for automatically disassembling and installing the abrasive paper, manual operation is not needed, the difficulty in replacing the abrasive paper is reduced, the working efficiency is improved, and automatic assembly is realized.

2. According to the sand paper box, the feeding box is obliquely arranged, the sand paper outlet is formed in one end which is obliquely inclined, the sand paper taking mechanism is matched with the linear lifting shaft through the first rotating shaft, the second rotating shaft and the linear lifting shaft, the sand paper taking sucking disc rotates downwards along with the movement of the moving bearing, sand paper is placed on the sand paper transferring sucking table, a sand paper feeding procedure is simplified, only the sand paper taking cylinder needs to move in a reciprocating mode, and a complex operation procedure does not need to be set.

3. The sand paper arranging mechanism fully utilizes the inclination of a sand paper feeding box, utilizes the gravity, automatically pushes the sand paper downwards to complete feeding when the outermost sand paper is removed under the action of the gravity of the first, second and third push plates, and completes arranging of the sand paper by matching with the press plate, thereby ensuring the neatness of the sand paper in the box, avoiding scattering and influencing the positioning of the sand paper in the subsequent process.

4. The edge folding mechanism pushes the abrasive paper folding plate to fold the edge of the abrasive paper through the abrasive paper folding cylinder, so that edge folding is completed quickly, clamping of an abrasive paper clamp is facilitated, and the smoothness of the surface of the abrasive paper is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is an overall structural view of the present invention;

FIG. 2 is a diagram of a sandpaper feeding device according to the present invention;

FIG. 3 is a top structure view of a sandpaper feeding box according to the present invention;

FIG. 4 is a bottom structure view of a sandpaper feeding box of the invention;

FIG. 5 is a view of the configuration of a sandpaper mounting and dismounting apparatus according to the present invention;

FIG. 6 is a structural view of a state of discharging the coated abrasive paper according to the present invention;

wherein, 1-a base, 2-a sand paper feeding device, 3-a sand paper loading and unloading device, 4-a clamp opening and closing cylinder, 5-a sand paper unloading device, 6-a sand paper transferring and sucking platform, 7-a flanging mechanism, 8-a mounting plate, 9-a sand paper feeding box, 10-a sand paper taking mechanism, 11-a sand paper outlet, 12-a sand paper arranging mechanism, 13-a first rotating shaft, 14-a second rotating shaft, 15-a fixed bearing, 16-a linear bearing, 17-a linear lifting shaft, 18-a sand paper taking sucking disc, 19-a movable bearing, 20-a first slide hole, 21-a sand paper taking cylinder, 22-a pressing plate, 23-a bottom plate, 24-a first push plate, 25-a slide guide rail, 26-a second push plate, 27-a second slide hole, 28-a third push plate, 29-support plate, 30-sand folding paper plate, 31-sand folding paper cylinder, 32-guide rod, 33-sand paper transferring cylinder, 34-sand paper discharging cylinder, 35-sand paper discharging suction plate and 36-suction cup.

Detailed Description

The present invention will be more fully described by way of a preferred embodiment in conjunction with the accompanying drawings, without limiting the scope of the invention as such.

As shown in fig. 1, the automatic sand paper handling device of a sander provided by the invention comprises a base 1, a sand paper feeding device 2 for feeding new sand paper and a sand paper handling device 3 for replacing the sand paper on the sander, wherein the sand paper handling device 3 comprises a clamp opening and closing cylinder 4, a sand paper discharging device 5 and a sand paper transferring and sucking table 6 for conveying the new sand paper of the sand paper feeding device 2 to a sand paper mounting station, and the sand paper transferring and sucking table 6 is in sliding connection with the base 1; anchor clamps open and shut 4 symmetries of cylinder and set up in the both sides of abrasive paper loading and unloading station, carry out opening and closing that the abrasive paper pressed from both sides on the polisher, move to carry at abrasive paper and inhale 6 below settings of platform and be used for the tight hem mechanism 7 of polisher clamp of being convenient for of abrasive paper side hem, press from both sides tightly abrasive paper by the abrasive paper of polisher behind the hem to abrasive paper.

As shown in fig. 2, the sand paper feeding device 2 of the present invention includes a mounting plate 8 disposed on one side of a base 1 and perpendicular to the base 1, the sand paper feeding device 2 is disposed on an inner side surface of the mounting plate 8, the sand paper feeding device 2 includes a sand paper feeding box 9 and a sand paper taking mechanism 10, a sand paper outlet 11 is disposed on one side of the sand paper feeding box 9 close to the sand paper taking mechanism, and a sand paper arranging mechanism 12 for arranging and conveying the sand paper is disposed on the sand paper feeding box 9;

the abrasive paper taking mechanism 10 comprises a first rotating shaft 13 and a second rotating shaft 14 which are arranged along the direction perpendicular to the surface direction of the mounting plate 8, one end of the first rotating shaft 13 is rotatably connected with the mounting plate 8 through a fixed bearing 15, the other end of the first rotating shaft is connected with a linear bearing 16, a linear lifting shaft 17 which is perpendicular to the side surface where the abrasive paper outlet 11 of the abrasive paper feeding box is located is arranged in the linear bearing 16 in a penetrating mode, one end of the linear lifting shaft 17 is slidably connected with the linear bearing 16, an abrasive paper taking suction cup 18 is fixed to the other end of the linear lifting shaft, and the disc surface of the abrasive paper taking suction cup 18 is opposite to the abrasive paper outlet 11 of the abrasive paper feeding box; second pivot 14 one end is connected with mounting panel 8 through moving bearing 19, the other end and straight line lift axle 17 fixed connection, be equipped with on mounting panel 8 and be used for moving the gliding first slide opening 20 of bearing 19 and get abrasive paper cylinder 21, it slides to get abrasive paper cylinder 21 drive moving bearing 19, it rotates downwards along with first pivot 13 to drive to get abrasive paper sucking disc 18 and straight line lift axle 17, place abrasive paper on the surface that the suction table 6 was carried to abrasive paper, the equal downward sloping of the inboard one end of abrasive paper feeding box 9 and first slide opening 20 is close to, the inclination of first slide opening 20 is greater than the inclination of abrasive paper feeding box 9, the preferred 15 degrees of inclination of abrasive paper feeding box 9, guarantee along with the downward sliding of moving bearing 19, can drive abrasive paper and get suction disc 18 and remove downwards, place the absorption on carrying suction table 6.

The specific feeding process comprises the steps that the sand paper taking cylinder 21 drives the movable bearing 19 to slide downwards in the first sliding hole 20, the linear lifting shaft 17 slides in the linear bearing, partial torque is caused due to inclination difference, the second rotating shaft 14 rotates relative to the movable bearing, the first rotating shaft 13 rotates relative to the fixed bearing 15, the sand paper taking sucker 18 is driven to rotate downwards, and sucked sand paper can be placed on the sand paper transferring suction table.

As shown in fig. 3 and 4, the sand paper tidying mechanism of the invention comprises a push plate component arranged on the opposite side of the sand paper outlet 11 and a press plate 22 arranged above the sand paper outlet for tidying sand paper, wherein the press plate 22 is symmetrically arranged above the sand paper outlet 11; the base plate 23 sliding connection of magazine 9 on the incline direction of push pedal subassembly along magazine 9 on the abrasive paper and abrasive paper, the push pedal subassembly is including setting up the first push pedal 24 in the base plate 23 below of magazine on the abrasive paper, first push pedal 24 passes through sliding guide 25 and base plate 232 sliding connection, there is second push pedal 26 at the bilateral symmetry of first push pedal 24, second push pedal 26 sets up with base plate 23 is perpendicular, the upper end of second push pedal 26 is located magazine 9 on the abrasive paper after passing base plate 23, slide in step along with first push pedal 24, set up on base plate 23 and be used for the gliding second slide opening 27 of second push pedal 26, be connected with third push pedal 28 between the side that two second push pedals are close to one side of abrasive paper place, the face of third push pedal 28 and the terminal surface laminating of abrasive paper, push paper under the effect of gravity in the material loading process and move to the abrasive paper mouth.

As shown in fig. 5 and 6, the base 1 of the present invention is provided with a sand paper transferring cylinder 33 for driving a sand paper transferring suction table to slide, the supporting plate 29 is pushed by the sand paper transferring cylinder 33 to move, the upper surface of the sand paper transferring suction table 6 is a sand paper adsorption surface, the supporting plate 29 is arranged below the sand paper transferring suction table 6, the sand paper transferring suction table 6 is connected with the base 1 by the supporting plate 29 in a sliding manner, the edge folding mechanism 7 comprises a sand paper folding plate 30 surrounding the periphery of the sand paper adsorption surface and a sand paper folding cylinder 31 for pushing the sand paper folding plate to move up and down, the sand paper folding cylinder 31 is fixed on the supporting plate 29, be equipped with guide bar 32 along perpendicular to face direction on backup pad 29, guide bar 32 bottom and backup pad 29 fixed connection, the top is passed and is rolled over abrasive paper board 30, moves the outer lane rebound that inhales platform 6 along abrasive paper shifting by rolling over abrasive paper cylinder 31 promotion and roll over abrasive paper board 30, carries out the hem at abrasive paper edge, does benefit to the clamp of follow-up polisher abrasive paper clamp and gets.

The invention provides a sand paper discharging device 5 arranged at the end part of a sand paper transferring suction table 6 in the sliding direction, which comprises a sand paper discharging cylinder 34 and a sand paper discharging suction plate 35, wherein the sand paper discharging cylinder 34 is arranged along the sliding direction vertical to the sand paper transferring suction table 6, the sand paper discharging suction plate 35 adopts a door-shaped structure, the side surface is fixedly connected with the sand paper discharging cylinder 34, a suction cup 36 is arranged on the surface of the sand paper discharging suction plate 35, the sand paper discharging cylinder 34 drives the sand paper discharging suction plate 35 to rotate, when the sand paper on a polisher is disassembled, the sand paper is sucked by the suction cup 36, when the sand paper is disassembled, the sand paper transferring suction table is in the state shown in figure 6, the sand paper discharging cylinder 34 drives the sand paper discharging suction plate 35 to rotate clockwise along the state shown in the figure to the horizontal position, the old sand paper on the polisher is sucked, then the sand paper transferring suction table 6 is moved rightwards after the reset, a new sand paper is conveyed to a sand paper assembling and disassembling station, and the sand paper assembling and disassembling station are sequentially folded, And clamping to complete the installation of the new sand paper.

When the automatic sand paper feeding device is used, sand paper is placed in a sand paper feeding box 9 to be fed, a sand paper clamp of a polisher is moved between two clamp opening and closing cylinders 4, a sand paper discharging suction plate 35 rotates to a sand paper discharging position to suck the sand paper, the clamp opening and closing cylinders 4 pull the sand paper clamp open, a 36 sucking disc sucks the sand paper, the sand paper is thrown into a waste material box through rotation, a sand paper sucking disc 18 sucks one piece of sand paper, the sand paper is rotated to a sand paper transferring suction table 6 through a sand paper taking mechanism 10, a push plate assembly automatically pushes the back sand paper to supplement a vacant position, subsequent feeding is facilitated, and the sand paper transferring cylinder 33 transfers the sand paper on the sand paper transferring suction table 6 to the position shown in the figure 5 to be loaded with the sand paper; anchor clamps are opened and shut cylinder 4 and are pulled open sandpaper clamp, roll over the jacking of sandpaper cylinder 31, will roll over the 7mm of the up jacking of sandpaper board 30, go up rolling over the sandpaper both ends, then the anchor clamps are opened and shut the cylinder and are stretched out, and sandpaper is cliied to the sandpaper clamp, accomplishes the action of going up sandpaper.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims

1. The automatic abrasive paper loading and unloading device of the grinding machine is characterized by comprising a base (1), wherein an abrasive paper loading device (2) used for loading new abrasive paper is arranged on the base (1), and an abrasive paper loading and unloading device (3) used for replacing the abrasive paper on the grinding machine is arranged on the base (1), the abrasive paper loading and unloading device (3) comprises a clamp opening and closing cylinder (4), an abrasive paper unloading device (5) and an abrasive paper transferring and sucking table (6) used for conveying the new abrasive paper of the abrasive paper loading device (2) to an abrasive paper installation station, and the abrasive paper transferring and sucking table (6) is in sliding connection with the base (1); the clamp opening and closing cylinders (4) are symmetrically arranged on two sides of the abrasive paper loading and unloading station to open and close an abrasive paper clamp on the sander, a folding mechanism (7) used for folding the side edge of the abrasive paper and facilitating clamping of the sander is arranged below the abrasive paper transferring and sucking table (6), and the abrasive paper is clamped by the abrasive paper clamp of the sander after the edge of the abrasive paper is folded;

the sand paper feeding device (2) comprises a mounting plate (8) which is arranged on one side of a base (1) and is vertical to the base (1), the sand paper feeding device (2) is arranged on the inner side surface of the mounting plate (8), the sand paper feeding device (2) comprises a sand paper feeding box (9) and a sand paper taking mechanism (10), a sand paper outlet (11) is formed in one side, close to the sand paper taking mechanism, of the sand paper feeding box (9), and a sand paper arranging mechanism (12) for arranging and conveying the sand paper is arranged on the sand paper feeding box (9);

the abrasive paper taking mechanism (10) comprises a first rotating shaft (13) and a second rotating shaft (14) which are arranged along the direction perpendicular to the surface direction of the mounting plate (8), one end of the first rotating shaft (13) is rotatably connected with the mounting plate (8) through a fixed bearing (15), the other end of the first rotating shaft is connected with a linear bearing (16), a linear lifting shaft (17) perpendicular to the side surface of the abrasive paper feeding box abrasive paper outlet (11) is arranged in the linear bearing (16) in a penetrating manner, one end of the linear lifting shaft (17) is slidably connected with the linear bearing (16), the other end of the linear lifting shaft is fixedly provided with an abrasive paper taking sucker (18), and the disc surface of the abrasive paper taking sucker (18) is just opposite to the abrasive paper outlet (11) of the abrasive paper feeding box; second pivot (14) one end is passed through removal bearing (19) and is connected with mounting panel (8), the other end and straight line lift axle (17) fixed connection, be equipped with on mounting panel (8) and be used for first slide opening (20) of removal bearing (19) gliding and get abrasive paper cylinder (21), it slides to get abrasive paper cylinder (21) drive removal bearing (19), it rotates downwards along with first pivot (13) to drive to get abrasive paper sucking disc (18) and straight line lift axle (17), place abrasive paper on the surface that the platform (6) was inhaled in the transfer of abrasive paper.

2. An automatic loading and unloading device for sandpaper of a sander according to claim 1, wherein the ends of the sandpaper loading box (9) and the first slide hole (20) near the inside are both inclined downward, and the inclination angle of the first slide hole (20) is larger than that of the sandpaper loading box (9).

3. A sander sand paper automatic loading and unloading device according to claim 2, characterized in that the sand paper tidying mechanism (12) comprises a push plate assembly arranged at the side opposite to the sand paper outlet (11) and a pressure plate (22) arranged above the sand paper outlet for tidying sand paper, and the pressure plate (22) is symmetrically arranged above the sand paper outlet (11); the push plate component is in sliding connection with a bottom plate (23) of the abrasive paper feeding box (9) along the inclined direction of the abrasive paper feeding box (9), the push plate component comprises a first push plate (24) arranged below the bottom plate (23) of the abrasive paper feeding box, the first push plate (24) is in sliding connection with the bottom plate (23) through a sliding guide rail (25), second push plates (26) are symmetrically connected to two sides of the first push plate (24), the second push plate (26) is perpendicular to the bottom plate (23), the upper end of the second push plate (26) penetrates through the bottom plate (23) and then is located in the abrasive paper feeding box (9), the second push plate (26) slides synchronously along with the first push plate (24), a second sliding hole (27) for the second push plate (26) to slide is formed in the bottom plate (23), a third push plate (28) is connected between the side faces of the two second push plates close to one side of the abrasive paper, the face of the third push plate (28) is attached to the end face of the abrasive paper, the sand paper is pushed to move towards the sand paper outlet under the action of gravity in the sand paper feeding process.

4. The automatic loading and unloading device for the sandpaper of the grinding machine according to claim 1, wherein the upper surface of the sandpaper transferring and sucking table (6) is a sandpaper adsorption surface, a supporting plate (29) is arranged below the sandpaper transferring and sucking table (6) and the base (1) are slidably connected through the supporting plate (29), the edge folding mechanism (7) comprises a sandpaper folding plate (30) surrounding the periphery of the sandpaper adsorption surface and a sandpaper folding cylinder (31) used for pushing the sandpaper folding plate to move up and down, the sandpaper folding cylinder (31) is fixed on the supporting plate (29), a guide rod (32) is arranged on the supporting plate (29) in a direction perpendicular to the plate surface, the bottom of the guide rod (32) is fixedly connected with the supporting plate (29), and the top of the guide rod penetrates through the sandpaper folding plate (30).

5. A sander automatic loading and unloading apparatus according to claim 4, characterized in that a sandpaper transfer cylinder (33) for driving a sandpaper transfer suction table to slide is provided on the base (1), and the supporting plate (29) is moved by being pushed by the sandpaper transfer cylinder (33).

6. A sander sand paper automatic handling device according to claim 1, characterized in that said sand paper unloading device (5) is arranged at the end of the sand paper transfer suction table (6) in the sliding direction, and comprises a sand paper unloading cylinder (34) and a sand paper unloading suction plate (35), the sand paper unloading cylinder (34) is arranged in the sliding direction perpendicular to the sand paper transfer suction table (6), the sand paper unloading suction plate (35) is of a gate structure, the side surface of the sand paper unloading suction plate is fixedly connected with the sand paper unloading cylinder (34), a suction cup (36) is arranged on the surface of the sand paper unloading suction plate (35), the sand paper unloading cylinder (34) drives the sand paper unloading suction plate (35) to rotate, and when the sand paper on the sander is disassembled, the sand paper is sucked by the suction cup (36).