CN211465965U - Polishing device of chair for teaching - Google Patents

Abstract

The utility model discloses a grinding device of chair for teaching, include: a frame; the upper end of the positioning block is provided with four positioning grooves distributed at the vertexes of a rectangle, and the lower end of the positioning block is provided with a strut which is fixed at the bottom of the rack; the support plate is positioned below the positioning block, two sliding rails and a cylinder IV are respectively arranged at two ends of the support plate, sliding blocks in sliding connection are arranged on the sliding rails, a polisher is arranged on one side, opposite to the sliding blocks, of the two ends of the support plate, polishing pieces of the polisher are consistent in height, a piston rod of the cylinder IV is connected with the sliding blocks, the cylinder IV can push the sliding blocks at the two ends to slide on the sliding rails in a reverse direction or a reverse direction, and the positioning grooves are respectively positioned on moving tracks of the polishers; the lifting assembly is positioned on the side surface of the rack and can drive the support plate to vertically lift; clamping component is located the top of frame, and this grinds paper-back edition and puts's application method is simple, and it is efficient to polish, can once only polish four stabilizer blades, ensures that stabilizer blade bottom highly uniform, avoids appearing the phenomenon that the seat rocked.

Description

Polishing device of chair for teaching

Technical Field

The utility model relates to a seat processing equipment field especially indicates a polishing device of chair for teaching.

Background

The chair for teaching is generally made for woodwork or combined material, four feet of seat and seat itself adopt the bolt to fix usually, because the preparation or the installation error of foot, cause the foot of seat to appear highly different's the condition easily in its bottom after fixed, the seat produces rocking of small amplitude easily when using, influence use comfort, in-process in follow-up use, because the long-term misuse of user, cause four feet wearing and tearing of seat to differ, thereby easily produce when using and rock, reduce the comfort of follow-up use.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a polishing device for a chair for teaching purpose, which solves all or one of the above-mentioned drawbacks of the prior art.

Based on the above object the utility model provides a grinding device of chair is used in teaching, include:

a frame;

the upper end of the positioning block is provided with four positioning grooves distributed at the vertexes of a rectangle, and the lower end of the positioning block is provided with a strut which is fixed at the bottom of the rack;

the support plate is positioned below the positioning block, two sliding rails and a cylinder IV are respectively arranged at two ends of the support plate, sliding blocks in sliding connection are arranged on the sliding rails, a polisher is arranged on one side, opposite to the sliding blocks, of the two ends of the support plate, polishing pieces of the polisher are consistent in height, a piston rod of the cylinder IV is connected with the sliding blocks, the cylinder IV can push the sliding blocks at the two ends to slide on the sliding rails in a reverse direction or a reverse direction, and the positioning grooves are respectively positioned on moving tracks of the polishers;

the lifting assembly is positioned on the side surface of the rack and can drive the support plate to vertically lift;

and the clamping assembly is positioned at the top of the frame and can horizontally clamp and lift the seat.

Optionally, the middle of the support plate is recessed downwards, the lower end of the support plate is provided with four cylinders five aligned with the positioning grooves, the upper end of a piston rod of each cylinder five is provided with a sleeve, the lower end of each positioning groove is provided with a guide hole, the sleeve extends into the guide hole, a first spring is arranged inside the sleeve, the top of the first spring is provided with a slide rod, the slide rod is in sliding connection with the sleeve, the top of the slide rod is provided with a groove, a light touch switch is arranged in the groove, a contact of the light touch switch is higher than the upper end face of the slide rod in a non-pressed state, sliding grooves are arranged on two sides of the groove, the bottom of the sliding groove is provided with a second spring, the elastic coefficient of the second spring is smaller than that of the first spring, the upper end of the second spring is provided with a connecting rod, the connecting rod is in sliding connection with the, when the tact switch is pressed and triggered, the warning lamp is turned on, when the tact switch is not pressed, the warning lamp is turned off, when a piston rod of the cylinder five extends to the maximum stroke, and when the spring two is in a natural state, the height of the polishing piece of the polishing machine is the same as that of the detection plate.

Optionally, the lifting assembly comprises a motor and a fixed seat which are arranged on two sides of the frame, a lead screw is arranged on an inner ring of a bearing of the fixed seat, one end of the lead screw is connected with an output shaft of the motor, and two ends of the support plate are in threaded connection with the lead screws on two sides of the frame.

Optionally, the clamping assembly comprises a first cylinder arranged at the top of the rack, a piston rod of the first cylinder extends downwards, a pressing plate is arranged at the front end of the piston rod of the first cylinder, two ends of the top of the rack are provided with a second cylinder, a piston rod of the second cylinder extends downwards, a mounting plate is arranged at the front end of the piston rod of the second cylinder, a third cylinder and two ends of the piston rod of the third cylinder extend outwards or retract backwards, a supporting rod in an L shape is arranged at the front end of the piston rod of the third cylinder, and a gasket is arranged at the front end of the supporting rod.

Optionally, an arc-shaped opening expanding outwards is formed in the upper portion of the positioning groove.

Optionally, the two ends of the mounting plate are provided with a supporting seat at the adjacent end, and the supporting rod is connected with the supporting seat in a sliding manner.

Optionally, the cylinder four is a low-speed cylinder.

From the above, the utility model discloses a grinding device of chair for teaching has following advantage: the feet of the seat are positioned and detected through the positioning grooves, so that the feet are respectively positioned on the moving tracks of all the grinding machines, the seat is horizontally clamped and lifted through the clamping assembly, the height of the grinding machines is adjusted through the lifting assembly, the feet of the seat are simultaneously ground through the grinding machines with the consistent grinding piece height, the foot height of the seat is consistent, the using method is simple, the grinding efficiency is high, the foot height of the seat is guaranteed to be consistent, and no shaking phenomenon occurs during use; the height of each support leg is detected by extruding the light touch switch through the detection plate, when the warning lamp is completely lightened, the polishing sheet of the polishing machine rises to the upper end of the support leg with a height slightly higher than the highest bottom, at the moment, the polishing sheet of the polishing machine is higher than the bottom of the support leg and has a small height exceeding distance, and the support leg reduces the polishing length on the premise of ensuring that the support leg can be completely polished, so that the waste of wood is avoided, and a worker can conveniently control the height of the support plate through the lifting assembly; the support plate can be stably lifted through the rotation of the screw rod; the seat is horizontally lifted through the support rod, and is horizontally clamped through the pressing plate, so that the horizontal clamping of the seat is realized; the arc-shaped opening is formed in the upper portion of the positioning groove, so that a worker can conveniently insert four support legs of the seat into the positioning groove, the support rod is supported by the support seat arranged on the mounting plate, the support rod is prevented from being bent downwards when the seat is jacked up, and the seat is guaranteed to be horizontally clamped; and the cylinder IV adopts a low-speed cylinder, so that the sliding block is slowly pushed, the low-speed movement of the grinding machine is ensured, and the grinding effect is improved.

Drawings

Fig. 1 is a schematic structural view of a polishing device of a chair for teaching of the present invention;

fig. 2 is a schematic structural view of a sleeve part of the present invention;

fig. 3 is a schematic view of the upper end surface of the positioning block of the present invention;

FIG. 4 is a schematic view of the seat support leg of the present invention inserted into the positioning groove;

fig. 5 is a schematic view of the chair of the present invention when clamped;

fig. 6 is a schematic view of the seat leg of the present invention when it is ground.

The device comprises a first air cylinder, a second air cylinder, a pressing plate, a 3 rack, a second 4 air cylinder, a 5 mounting plate, a third 6 air cylinder, a support rod, a 8 gasket, a 9 support seat, a 10 guide hole, a 11 motor, a 12 lead screw, a 13 support plate, a 14 fixing seat, a fourth 15 air cylinder, a 16 sliding block, a 17 sliding rail, an 18 sander, a 19 sleeve, a 191 groove, a first 192 spring, a 193 detection plate, a 194 sliding rod, a second 195 spring, a 196 warning lamp, a 197 sliding chute, a 198 connecting rod, a 199-tact switch, a 20 positioning block, a 21 support, a 22 positioning groove and a fifth 23 air cylinder.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.

It should be noted that all expressions of "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name or different parameters, and it is understood that "first" and "second" are only for convenience of expression and should not be construed as limitations of the embodiments of the present invention, and that the terms of direction and position such as "up", "middle", "down", "front", "back", "left", "right", "inner", "outer", "side", etc. in the embodiments of the present invention refer to directions and positions of the attached drawings, and therefore, the terms of direction and position are used for illustration and understanding of the present invention, and are not used to limit the present invention from the following embodiments.

Based on the grinding device of chair for teaching that above-mentioned purpose provided, include:

a frame 3;

the upper end of the positioning block 20 is provided with four positioning grooves 22 distributed at the rectangular vertexes, the lower end of the positioning block is provided with a support column 21, and the support column 21 is fixed at the bottom of the rack 3;

the support plate 13 is positioned below the positioning block 20, two slide rails 17 and a cylinder four 15 are respectively arranged at two ends of the support plate, a slide block 16 in sliding connection is arranged on the slide rail 17, grinding machines 18 are arranged on the opposite sides of the slide blocks 16 at the two ends, the grinding pieces of the grinding machines 18 are consistent in height, a piston rod of the cylinder four 15 is connected with the slide block 16, the cylinder four 15 can push the slide blocks 16 at the two ends to slide on the slide rails 17 in a reverse direction or a reverse direction, and the positioning grooves 22 are respectively positioned on the moving tracks of the grinding machines 18;

the lifting assembly is positioned on the side surface of the frame 3 and can drive the support plate 13 to vertically lift;

and the clamping assembly is positioned at the top of the frame 3 and can horizontally clamp and lift the seat.

Referring to fig. 1-6, as an embodiment, the polishing device of the chair for teaching of the present invention, four positioning grooves 22 are matched with four supporting legs of the chair, when in use, the supporting plate 13 is lowered to a certain height by the lifting assembly, the four supporting legs of the chair are inserted into the positioning grooves 22, if the chair can be inserted smoothly, the supporting legs of the chair are installed without deviation, if the chair cannot be inserted smoothly, the supporting legs are installed ineligibly, two sliding rails 17 are respectively arranged at two ends of the supporting plate 13, a sliding block 16 is arranged on each sliding rail 17, a polisher 18 is arranged on each sliding block 16, i.e. there are four polishers 18 in total, the four supporting legs of the chair are polished flat respectively, after the chair is inserted, the chair is clamped and lifted horizontally by the clamping assembly, then the lifting assembly is used to control the supporting plate 13 to be lifted, so that the polishing pieces of the polish, the piston rods of the four control cylinders 15 extend out to enable the sliding blocks 16 at two ends to slide towards the support legs of the seat, the sliding blocks 16 drive the grinding machines 18 to move towards the support legs, when the grinding machines 18 move to the lower ends of the support legs, the grinding machines 18 are ground, the positioning grooves 22 not only carry out installation detection on the support legs of the seat, but also enable the support legs of the seat to be located on the moving tracks of the grinding machines 18, so that the four grinding machines 18 can be conveniently ground when moving towards the support legs, the sliding blocks 16 do linear motion on the sliding rails 17, the grinding machines 18 are guaranteed not to shake up and down when moving horizontally, the four grinding machines 18 respectively grind the four support legs of the seat, as the grinding sheets of the grinding machines 18 are the same in height, and in the grinding process, the clamping assemblies horizontally clamp the seat, the bottoms of the four ground support legs are the same in height, and when the seat, the grinding device is simple in use method and high in grinding efficiency, can grind the four support legs at one time, ensures the height consistency of the bottom of the support legs, and avoids the phenomenon that the seat shakes.

Furthermore, the middle of the support plate 13 is recessed downwards, the lower end of the support plate is provided with four air cylinders five 23 aligned with the positioning grooves 22, the upper end of a piston rod of each air cylinder five 23 is provided with a sleeve 19, the lower end of each positioning groove 22 is provided with a guide hole 10, each sleeve 19 extends into each guide hole 10, a first spring 192 is arranged inside each sleeve 19, the top of each first spring 192 is provided with a slide rod 194, each slide rod 194 is connected with the corresponding sleeve 19 in a sliding manner, the top of each slide rod 194 is provided with a groove 191, each groove 191 is internally provided with a tact switch 199, the contact of each tact switch 199 is higher than the upper end face of each slide rod 194 in an unpressed state, sliding grooves 197 are arranged on two sides of each groove 191, the bottoms of the sliding grooves 197 are provided with second spring 195, the elastic coefficient of the second spring 195 is smaller than that of the first spring 192, the upper ends of the second spring 195 are provided with, the side of the sliding rod 194 is provided with a warning light 196, the warning light 196 is electrically connected with a tact switch 199, when the tact switch 199 is pressed and triggered, the warning light 196 is turned on, when the tact switch 199 is not pressed, the warning light 196 is turned off, when a piston rod of the cylinder five 23 extends to the maximum stroke, when the spring two 195 is in a natural state, the height of a grinding sheet of the grinding machine 18 is the same as that of the detection plate 193, when the seat is horizontally clamped and lifted from the positioning groove 22 by the clamping assembly, the support plate 13 is driven to ascend by the lifting assembly, the piston rod of the cylinder five 23 is controlled to extend upwards to the maximum stroke, in the ascending process of the support plate 13, the sleeve 19 extends upwards from the guide hole 10, the guide hole 10 enables the sleeve 19 to move in the vertical direction, the sleeve 19 is prevented from shaking, subsequent detection precision is influenced, and the sleeve 19 extends out from the positioning groove 22 and then moves towards the, with the rising of the support plate 13, the detection plate 193 contacts with the bottoms of the legs of the seat firstly, then the second spring 195 is compressed firstly, the connecting rod 198 moves towards the bottom of the sliding groove 197, the distance between the detection plate 193 and the top of the sliding rod 194 is reduced, finally the detection plate 193 is attached to the top of the sliding rod 194, meanwhile, the detection plate 193 presses the tact switch 199 to enable the caution light 196 to be lightened, if the caution lights 196 on the four sliding rods 194 are lightened simultaneously, the four legs of the seat are contacted with the detection plate 193 simultaneously and press the tact switch 199 through the detection plate 193 simultaneously, the bottoms of the four legs of the seat are consistent in height and do not need to be polished, if the four caution lights 196 cannot be lightened simultaneously, the heights of the bottoms of the legs of the seat are inconsistent, the support plate 13 is lifted continuously through the lifting component, when the sleeve 19 with the lightened caution light 196 is lifted continuously, the first spring 192 is compressed, and, the tact switch 199 is arranged in the groove 191, after the detection plate 193 is contacted with the top of the sliding rod 194, pressure is not continuously applied to the tact switch 199, so that the tact switch 199 is protected, when the sleeve 19 with the warning lamps 196 not lighted continuously rises, as the elastic coefficient of the spring II 195 is smaller than that of the spring I192, the spring II 195 is compressed first, the detection plate 193 approaches to the top of the sliding rod 194 first, when all the warning lamps 196 are lighted, the lifting of the support plate 13 is stopped, the grinding plate 18 is lifted synchronously while the grinding machine is lifted, the height of the grinding sheet of the grinding machine 18 is consistent with that of the detection plate 193 when the spring II 195 is in a natural state, the lower the height of the bottom of the leg is, the warning lamps 196 are lighted first, after the last warning lamp 196 is lighted, the grinding sheet of the grinding machine 18 is lifted to be slightly higher than the upper end of the leg with the highest bottom, and the height of the grinding sheet of the grinding machine 18 is higher, and the height is short, the grinding length is reduced and the wood waste is avoided on the premise that the support legs can be completely ground, the piston rod of the cylinder five 23 is controlled to be retracted, the sleeve 19 is lowered to the height which does not affect the grinding, then the grinding machine 18 is started, and meanwhile, the cylinder four 15 is controlled to push the slider 16 to move towards the support legs of the seat, so that the grinding machine 18 can grind the feet of the seat.

Further, the lifting assembly comprises a motor 11 and a fixed seat 14 which are arranged on two sides of the rack 3, a screw rod 12 is arranged on a bearing inner ring of the fixed seat 14, one end of the screw rod 12 is connected with an output shaft of the motor 11, two ends of the support plate 13 are in threaded connection with the screw rods 12 on two sides of the rack 3, the screw rod 12 is driven to rotate through rotation of the motor 11, the support plate 13 is in threaded connection with the screw rod 12, and the screw rod 12 drives the support plate 13 to stably ascend or descend when rotating.

Further, the clamping assembly comprises a first air cylinder 1 arranged at the top of a rack 3, a piston rod of the first air cylinder 1 extends downwards, a pressing plate 2 is arranged at the front end of the piston rod, two air cylinders 4 are arranged at two ends of the top of the rack 3, a piston rod of the second air cylinder 4 extends downwards, a mounting plate 5 is arranged at the front end of the piston rod, a third air cylinder 6 is arranged at the lower end of the mounting plate 5, piston rods of the third air cylinders 6 at two ends of the piston rod horizontally extend oppositely or retract reversely, an L-shaped supporting rod 7 is arranged at the front end of the piston rod of the third air cylinder 6, a gasket 8 is arranged at the front end of the supporting rod 7, when the foot of the seat is inserted into the positioning groove 22, the piston rod of the third air cylinder 6 is controlled to extend out, the supporting rod 7 extends towards the seat, when the gasket 8 at the front end of the supporting rod 7 is positioned below the seat, the mounting plate 5 is lifted upwards by the second cylinder 4, the supporting rod 7 is lifted, the gasket 8 at the front end of the supporting rod 7 is jacked up after being contacted with the bottom of the seat, and the pressing plate 2 extending downwards presses the gasket 8 from the upper part of the seat, so that the horizontal clamping of the seat is realized, the contact area between the supporting rod 7 and the seat is increased by the gasket 8, and the wood seat is prevented from being damaged due to overlarge stress.

Further, the upper portion of the positioning slot 22 is provided with an arc-shaped opening expanding outwards, the lower portion of the positioning slot 22 is matched with the shape and size of the foot of the seat, whether the installation of the seat support leg is qualified can be detected, and the upper portion is slightly larger than the arc-shaped opening of the foot of the seat, so that a worker can conveniently insert the seat into the positioning slot 22 quickly.

Further, both ends the close one end of mounting panel 5 is equipped with supporting seat 9, branch 7 and supporting seat 9 sliding connection, supporting seat 9 play direction and supporting role to branch 7, and branch 7 is when lifting up the seat, and supporting seat 9 provides a strong point in the middle part of branch 7, avoids branch 7 downwarping, makes the seat can not the level clamp tightly.

Further, the cylinder four 15 is a low-speed cylinder, and the sliding block 16 is pushed to move slowly, so that the low-speed movement of the sander 18 is ensured, and the sanding effect is improved.

In combination with the above description, the utility model discloses a grinding device of chair for teaching has following advantage: the feet of the seat are positioned and detected through the positioning grooves 22, so that the feet are respectively positioned on the moving tracks of all the grinding machines 18, the seat is horizontally clamped and lifted through the clamping assembly, the height of the grinding machines 18 is adjusted through the lifting assembly, the feet of the seat are simultaneously ground through the grinding machines 18 with consistent grinding piece heights, the heights of the feet of the seat are consistent, the using method is simple, the grinding efficiency is high, the feet of the seat are consistent, and no shaking phenomenon occurs during use; the height of each supporting leg is detected by extruding the tact switch 199 through the detection plate 193, when the warning lamp 196 is completely lightened, the polishing sheet of the polisher 18 rises to be slightly higher than the upper end of the supporting leg with the highest bottom, at the moment, the polishing sheet of the polisher 18 is higher than the bottom of the supporting leg, the height of the polishing sheet is small, the supporting leg can be completely polished, the polishing length is reduced, wood waste is avoided, and workers can conveniently control the height of the supporting plate 13 through the lifting assembly; the support plate 13 can be stably lifted through the rotation of the screw rod 12; the seat is horizontally lifted through the supporting rod 7, and is horizontally clamped through the pressing plate 2, so that the horizontal clamping of the seat is realized; the arc-shaped opening is formed in the upper portion of the positioning groove 22, so that a worker can conveniently insert four support legs of the seat into the positioning groove 22, the supporting rod 7 is supported by the supporting seat 9 arranged on the mounting plate 5, the support rod 7 is prevented from being bent downwards when the seat is jacked up, and the seat is guaranteed to be horizontally clamped; the cylinder four 15 adopts a low-speed cylinder, so that the sliding block 16 is slowly pushed, the low-speed movement of the grinding machine 18 is ensured, and the grinding effect is improved.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.

While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.

The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (7)

1. The utility model provides a grinding device of chair for teaching which characterized in that includes:

a frame (3);

the upper end of the positioning block (20) is provided with four positioning grooves (22) distributed at the top of a rectangle, the lower end of the positioning block is provided with a support column (21), and the support column (21) is fixed at the bottom of the rack (3);

the support plate (13) is positioned below the positioning block (20), two sliding rails (17) and a cylinder four (15) are arranged at two ends of the support plate respectively, a sliding block (16) in sliding connection is arranged on the sliding rail (17), a grinding machine (18) is arranged on one side, opposite to the sliding block (16), of the two ends of the support plate, the grinding pieces of the grinding machine (18) are consistent in height, a piston rod of the cylinder four (15) is connected with the sliding block (16), the cylinder four (15) can push the sliding blocks (16) at the two ends to slide on the sliding rail (17) in an opposite or opposite direction, and the positioning grooves (22) are positioned on the moving tracks of the grinding machines (18) respectively;

the lifting assembly is positioned on the side surface of the rack (3) and can drive the support plate (13) to vertically lift;

and the clamping assembly is positioned at the top of the frame (3) and can horizontally clamp and lift the seat.

2. The polishing device of the chair for teaching according to claim 1, wherein the middle of the support plate (13) is recessed downwards, the lower end of the support plate is provided with four cylinders five (23) aligned with the positioning grooves (22), the upper end of the piston rod of the cylinders five (23) is provided with a sleeve (19), the lower end of the positioning grooves (22) is provided with a guide hole (10), the sleeve (19) extends into the guide hole (10), a spring one (192) is arranged inside the sleeve (19), the top of the spring one (192) is provided with a slide rod (194), the slide rod (194) is connected with the sleeve (19) in a sliding manner, the top of the slide rod (194) is provided with a groove (191), a tact switch (199) is arranged in the groove (191), the tact switch (199) is higher than the upper end surface of the slide rod (194) in an unpressed state, and sliding grooves (197) are arranged on two sides of the groove (191), the bottom of the sliding groove (197) is provided with a second spring (195), the elastic coefficient of the second spring (195) is smaller than that of the first spring (192), the upper end of the second spring (195) is provided with a connecting rod (198), the connecting rod (198) is in sliding connection with the sliding rod (194), the top of the connecting rod (198) is provided with a detection plate (193), the side face of the sliding rod (194) is provided with a warning lamp (196), the warning lamp (196) is electrically connected with the tact switch (199), when the tact switch (199) is pressed and triggered, the warning lamp (196) is turned on, when the tact switch (199) is not pressed, the warning lamp (196) is turned off, when the piston rod of the five cylinder (23) extends to the maximum stroke, and when the second spring (195) is in a natural state, the height of the polishing piece of the polishing machine (18) is the same as that of the detection.

3. The polishing device of the chair for teaching according to claim 1, wherein the lifting assembly comprises a motor (11) and a fixed seat (14) which are arranged at two sides of the frame (3), a screw rod (12) is arranged at the inner ring of a bearing of the fixed seat (14), one end of the screw rod (12) is connected with an output shaft of the motor (11), and two ends of the support plate (13) are in threaded connection with the screw rods (12) at two sides of the frame (3).

4. The polishing device for the teaching chair according to claim 1, wherein the clamping assembly comprises a first cylinder (1) arranged at the top of the rack (3), a piston rod of the first cylinder (1) extends downwards, a pressing plate (2) is arranged at the front end of the piston rod, two cylinders (4) are arranged at two ends of the top of the rack (3), a piston rod of the second cylinder (4) extends downwards, a mounting plate (5) is arranged at the front end of the piston rod, a third cylinder (6) is arranged at the lower end of the mounting plate (5), piston rods of the third cylinders (6) extend out horizontally or retract backwards, an L-shaped supporting rod (7) is arranged at the front end of the piston rod of the third cylinder (6), and a gasket (8) is arranged at the front end of the supporting rod (7).

5. The grinding device of a chair for teaching as claimed in claim 1, characterized in that the upper part of the positioning slot (22) is provided with an outwardly flared arc-shaped opening.

6. The grinding device of the chair for teaching as claimed in claim 4, characterized in that a support (9) is provided at the end of the mounting plate (5) near the two ends, and the support rod (7) is connected with the support (9) in a sliding manner.

7. The chair polishing device as claimed in claim 1, wherein said cylinder four (15) is a low speed cylinder.

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