CN213828339U

CN213828339U - Automatic device of polisher emery wheel crashproof protection

Info

Publication number: CN213828339U
Application number: CN202022438788.8U
Authority: CN
Inventors: 姚承享; 成和银
Original assignee: Hubei Shengda Electromechanical Co ltd
Current assignee: Hubei Shengda Electromechanical Co ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-07-30
Anticipated expiration: 2030-10-27

Abstract

The utility model relates to a polisher field discloses an automatic device of polisher emery wheel crashproof protection, including the frame, set up in glide machanism, fixture, feeding mechanism in the frame, be used for supporting fixture's supporting mechanism, actuating mechanism and buffer gear, actuating mechanism is used for the drive the supporting mechanism is in glide machanism is last to slide. The utility model discloses the position that the work piece was placed is not rigid, and when the emery wheel met great arch on the work piece or exceeded the position of round pin volume, the emery wheel was kept away from automatically to the work piece, and the protection emery wheel does not receive the striking, avoids the damage to the emery wheel to the life of emery wheel has been prolonged.

Description

Automatic device of polisher emery wheel crashproof protection

Technical Field

The utility model relates to a polisher technical field, in particular to automatic device of polisher emery wheel crashproof protection.

Background

A grinding machine is a machine for performing finish machining and surface polishing on a workpiece to be machined, and generally clamps the workpiece on a station of the grinding machine, and then grinds the workpiece by the feed amount of a rotating grinding wheel, thereby achieving the purpose of finish machining and surface polishing.

However, the position where the workpiece is placed is rigid, and when the grinding wheel hits the workpiece with irregular outer circle, only the part larger than the feed amount can be rigidly ground, so that the grinding wheel may be damaged when hitting a locally large bulge of the workpiece during grinding.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an automatic device of polisher emery wheel crashproof protection aims at solving and runs into the problem that probably damages the emery wheel when the local great protruding of work piece when the grinding.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides an automatic device of polisher emery wheel crashproof protection, includes the frame, set up in glide machanism in the frame, be used for the fixture of centre gripping work piece, will the work piece is delivered to the feeding mechanism of fixture department, be used for supporting fixture's supporting mechanism, set up in actuating mechanism in the frame and be used for buffering the buffer gear of the impact that receives when the work piece was polished, actuating mechanism is used for the drive the supporting mechanism is in glide machanism goes up to slide, supporting mechanism with glide machanism slides and links to each other and is located glide machanism's top, actuating mechanism buffer gear all with the supporting mechanism links to each other and all is located supporting mechanism's below, feeding mechanism fixture all set up in on the supporting mechanism and all is located glide machanism's top.

According to the technical scheme, the workpiece is conveyed to the clamping mechanism by the feeding mechanism, the clamping mechanism clamps the workpiece to be machined, the driving mechanism drives the supporting mechanism supporting the clamping mechanism to slide on the sliding mechanism, so that the workpiece is slowly close to the rotating grinding wheel, the grinding wheel slowly moves to grind and pin-machine the workpiece, when a part exceeding a set grinding pin amount or a local part on the workpiece has a large bulge, the workpiece pushes the clamping mechanism to displace, the clamping mechanism pushes the supporting mechanism to displace, the supporting mechanism pushes the buffer mechanism to displace, the buffer mechanism buffers the impact of a pushing force generated by pushing the workpiece on the rack, meanwhile, the distance between the workpiece exceeding the set grinding pin amount and the grinding wheel is increased, the damage of the workpiece on the grinding wheel is avoided, and when the pin is normally ground, the workpiece is driven by the driving mechanism to be close to the rotating grinding wheel to grind the pin. Wherein, having set up glide machanism, actuating mechanism and buffer gear, the position that the work piece was placed is not rigid to when the emery wheel met great arch on the work piece or surpassed the position of round pin volume, the emery wheel was kept away from automatically to the work piece, and the protection emery wheel does not receive the striking, avoids the damage to the emery wheel, thereby has prolonged the life of emery wheel.

It should be understood that other arrangements of the sander, such as sanding wheels, are common prior art and will not be described in any greater detail herein.

The utility model discloses a further set up to: the sliding mechanism comprises two sliding rails arranged on the rack, and the two sliding rails are parallel.

Through above-mentioned technical scheme, supporting mechanism can stably slide on the slide rail of two parallels of level setting, and two slide rails that set up can realize supporting mechanism's the sliding, and its position is also comparatively stable simultaneously.

The utility model discloses a further set up to: the supporting mechanism include with slide rail clearance fit's the glide, set up in the lower bolster at glide top, be located last backup pad and a plurality of bracing piece, a plurality of the lower bolster top the both ends of bracing piece respectively with go up the backup pad the lower bolster is connected.

Through above-mentioned technical scheme, the slider slides under actuating mechanism's drive with slide rail clearance fit, slider drives backup pad, bracing piece and goes up the backup pad and slide as a whole down.

The utility model discloses a further set up to: the bracing piece is provided with four, the bracing piece with go up the junction of backup pad, the bracing piece with the junction of bottom suspension fagging is the rectangle and distributes.

Through the technical scheme, the relative positions of the upper supporting plate and the lower supporting plate are fixed by the four supporting rods, so that the whole supporting mechanism is stable, and meanwhile, the workpiece is not hindered from being close to the grinding wheel and the grinding wheel grinding pin workpiece.

The utility model discloses a further set up to: the clamping mechanism comprises a liftable pressure plate and a rotatable workpiece tray, the pressure plate is located right above the workpiece tray, and the axis of the pressure plate and the axis of the workpiece tray are on the same straight line.

Through above-mentioned technical scheme, place the work piece on rotatable work piece tray, the pressure disk downstream of liftable is to compressing tightly the work piece, and the work piece is held promptly, and self is rotatable simultaneously.

The utility model discloses a further set up to: the top of going up the backup pad is provided with driving cylinder one, the bottom of driving cylinder one is provided with drive shaft one, drive shaft one the top of pressure disk links to each other, the bottom of bottom suspension fagging is provided with the rotation motor, the top of rotating the motor is provided with the output shaft, the output shaft with the bottom of work piece tray links to each other.

Through the technical scheme, the first driving cylinder provides power, and the first driving shaft stretches, so that the lifting of the pressure plate connected with the first driving shaft is realized; and starting the rotating motor, and rotating the output shaft to drive the workpiece tray connected with the output shaft to rotate.

It should be understood that the first driving cylinder (which may be a cylinder, a hydraulic cylinder) and the rotating motor are conventional technical means in the art, and the working principle and function thereof are also common in the prior art, and will not be described in detail herein.

The utility model discloses a further set up to: the driving mechanism comprises a second driving cylinder fixedly connected with the rack and a second driving shaft connected with the second driving cylinder, a first connecting plate is arranged at the bottom of the lower supporting plate, and the second driving shaft is connected with the side part of the first connecting plate.

Through the technical scheme, the driving cylinder II provides power, the driving shaft II stretches out and draws back to drive the connecting plate I connected with the driving shaft II, the whole supporting mechanism is driven to slide on the sliding rail, and therefore the workpiece clamped on the clamping mechanism is driven to displace.

It should be understood that the second driving cylinder (which may be an air cylinder or a hydraulic cylinder) is a conventional technical means in the art, and the working principle and function thereof are also common prior art, and will not be described herein in detail.

The utility model discloses a further set up to: feeding mechanism include with the continuous longitudinal section of glide be L shape connecting plate two, with connecting plate two deviates from the continuous driving cylinder three of one side of bottom suspension fagging and with the continuous drive shaft three of driving cylinder three, drive shaft three is kept away from the one end of driving cylinder three is provided with connecting block one and the connecting block two that links to each other with connecting block one bottom plate, the top of connecting block two is provided with connecting piece one, the both ends of connecting piece one are provided with connecting piece two respectively, two connecting piece two is kept away from the tip of connecting piece one is rotated and is provided with two pay-off gyro wheels, two the plane at pay-off gyro wheel place is located between pressure disk and the work piece tray, two the straight line at pay-off gyro wheel axle center place with the pressure disk with the straight line at work piece tray axle center place is parallel.

Through the technical scheme: the workpiece is placed between a workpiece tray and a pressure plate (the position of the workpiece is not completely aligned with the workpiece tray and the pressure plate), then a third driving cylinder is opened, the third driving cylinder provides power, a third driving shaft stretches out and draws back, the positions of a first connecting block, a second connecting block, a first connecting piece, a second connecting piece and two feeding rollers which are connected with the driving shaft translate, the two feeding rollers translate to be in contact with the workpiece, then the translation is continued, and the workpiece is pushed to be completely aligned with the positions of the workpiece tray and the pressure plate and can be used for machining. Wherein, set up feeding mechanism, promoted the degree of accuracy of pay-off, avoided artifical pay-off the degree of accuracy not enough and influence the processing effect.

It should be understood that the third driving cylinder (which may be an air cylinder or a hydraulic cylinder) is a conventional technical means in the art, and the working principle and function thereof are also common in the prior art, and will not be described in detail herein.

The utility model discloses a further set up to: the buffer mechanism comprises a sliding shaft connected with the side part of the first connecting plate, a compression spring connected with the rack and a guide sleeve sleeved in the middle of the sliding shaft, the compression spring is connected with the sliding shaft, a guide rod is arranged at the bottom end of the guide sleeve, and the guide rod is fixedly connected with the rack.

Through the technical scheme, when the part exceeding the set grinding pin amount or the local part of the workpiece has a large bulge, the workpiece pushes the clamping mechanism to displace, the clamping mechanism pushes the supporting mechanism to displace, the connecting plate drives the sliding shaft to slide towards the direction of the compression spring, the compression spring is compressed, and the connecting plate can not impact on the rack, so that the buffering effect is achieved, and the whole device is protected.

The utility model discloses a further set up to: the improved compressor is characterized in that a fixing hole is formed in the rack, a fixing gasket is arranged on the compression spring, the diameter of the fixing gasket is larger than the inner diameter of the fixing hole, a fixing screw rod penetrating through the fixing hole is arranged on the fixing gasket, a fixing nut is connected to the fixing screw rod through threads, and the fixing nut is abutted to the rack.

Through the technical scheme, the fixing screw penetrates through the fixing hole, and the fixing nut is screwed tightly, namely the compression spring is fixed on the rack; and the fixing nut is unscrewed to separate the fixing screw rod from the fixing hole, namely the compression spring is separated from the rack, and the compression spring is convenient to replace when the compression spring is old and needs to be replaced.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the sliding mechanism, the driving mechanism and the buffering mechanism are arranged, the position where the workpiece is placed is not rigid, when the grinding wheel meets a large bulge on the workpiece or exceeds the position of the grinding pin amount, the workpiece is automatically far away from the grinding wheel, the grinding wheel is protected from being impacted, the damage to the grinding wheel is avoided, and therefore the service life of the grinding wheel is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a first schematic structural diagram of an embodiment of an anti-collision protection device for a grinding wheel of an automatic grinding machine of the present invention;

FIG. 2 is an enlarged view at A in FIG. 1;

fig. 3 is a schematic structural diagram of an embodiment of the device for impact protection of the grinding wheel of the automatic grinding machine of the present invention;

fig. 4 is a cross-sectional view of an embodiment of the present invention of an automatic sander for wheel impact protection;

FIG. 5 is an enlarged view at B in FIG. 4;

fig. 6 is an enlarged view at C in fig. 4.

In the figure, 1, a frame; 2. a slide rail; 3. a slider; 4. a lower support plate; 5. an upper support plate; 6. a support bar; 7. a platen; 8. a workpiece tray; 9. a first driving cylinder; 10. a first driving shaft; 11. rotating the motor; 12. an output shaft; 13. a second driving cylinder; 14. a second driving shaft; 15. a first connecting plate; 16. a second connecting plate; 17. a third driving cylinder; 18. a third driving shaft; 19. a first connecting block; 20. a second connecting block; 21. a first connecting piece; 22. a second connecting piece; 23. a feeding roller; 24. a sliding shaft; 25. a compression spring; 26. a guide sleeve; 27. a guide bar; 28. a fixing hole; 29. fixing a gasket; 30. fixing the screw rod; 31. and (5) fixing the nut.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings and specific embodiments. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

An anti-collision protection device for a grinding wheel of an automatic grinding machine, as shown in fig. 1 to 6, comprises a frame 1, a sliding mechanism arranged on the frame 1, a clamping mechanism for clamping a workpiece, a feeding mechanism for feeding the workpiece to the clamping mechanism, a supporting mechanism for supporting the clamping mechanism, a driving mechanism arranged on the frame 1 and a buffer mechanism for buffering the impact force applied to the workpiece during grinding, the driving mechanism is used for driving the supporting mechanism to slide on the sliding mechanism, the supporting mechanism is connected with the sliding mechanism in a sliding manner and is positioned above the sliding mechanism, the driving mechanism and the buffer mechanism are both connected with the supporting mechanism and are both positioned below the supporting mechanism, the feeding mechanism and the clamping mechanism are arranged on the supporting mechanism and are located above the sliding mechanism.

The use process comprises the following steps: the workpiece is conveyed to the clamping mechanism by using the feeding mechanism, the clamping mechanism clamps the workpiece to be machined, the driving mechanism drives the supporting mechanism supporting the clamping mechanism to slide on the sliding mechanism, so that the workpiece slowly approaches to the rotating grinding wheel, the grinding wheel slowly moves to grind and pin the workpiece, when a part exceeding a set grinding pin amount or a local part on the workpiece has a large bulge, the workpiece pushes the clamping mechanism to displace, the clamping mechanism pushes the supporting mechanism to displace, the supporting mechanism pushes the buffer mechanism to displace, the buffer mechanism buffers the impact of a pushing force generated by pushing the workpiece on the rack 1, and meanwhile, the distance between the workpiece exceeding the set grinding pin amount and the grinding wheel is increased, so that the damage of the workpiece on the grinding wheel is avoided, and when the grinding pin is normal, the workpiece approaches to the rotating grinding wheel to grind and pin under the driving of the driving mechanism. Wherein, having set up glide machanism, actuating mechanism and buffer gear, the position that the work piece was placed is not rigid to when the emery wheel met great arch on the work piece or surpassed the position of round pin volume, the emery wheel was kept away from automatically to the work piece, and the protection emery wheel does not receive the striking, avoids the damage to the emery wheel, thereby has prolonged the life of emery wheel.

The glide machanism including set up in slide rail 2 in the frame 1, slide rail 2 level is provided with two, two slide rail 2 parallels, and supporting mechanism can stably slide on the slide rail 2 of two parallels of level setting, and two slide rail 2 that set up can realize supporting mechanism's sliding, and its position is also comparatively stable simultaneously.

The supporting mechanism include with 2 clearance fit's of slide rail glide 3, set up in the bottom suspension fagging 4 at 3 tops of glide, be located last backup pad 5 and a plurality of bracing piece 6, a plurality of 4 tops of bottom suspension fagging 6 both ends respectively with go up backup pad 5 the bottom suspension fagging 4 is connected,

glide

3 and 2 clearance fit of slide rail, glide 3 slides under actuating mechanism's drive, and glide 3 drives bottom suspension fagging 4, bracing piece 6 and goes up backup pad 5 and slides as a whole.

The bracing piece 6 is provided with four, the bracing piece 6 with go up the junction of backup pad 5 the bracing piece 6 with the junction of bottom suspension fagging 4 is the rectangle and distributes, and four spinal branch vaulting poles 6 make the relative position of going up backup pad 5 and bottom suspension fagging 4 fixed, make whole supporting mechanism comparatively firm, do not hinder going on of work piece near emery wheel, emery wheel round pin work piece again simultaneously.

Fixture includes liftable pressure disk 7 and rotatable work piece tray 8, pressure disk 7 is located directly over work piece tray 8, the axle center of pressure disk 7 with work piece tray 8's axle center is on same straight line, places the work piece on rotatable work piece tray 8, and liftable pressure disk 7 downstream is to compressing tightly the work piece, and the work piece is held promptly, and self is rotatable simultaneously.

The top of the upper supporting plate 5 is provided with a first driving cylinder 9, the bottom of the first driving cylinder 9 is provided with a first driving shaft 10, the first driving shaft 10 is connected with the top of the pressing plate 7, the bottom of the lower supporting plate 4 is provided with a rotating motor 11, the top of the rotating motor 11 is provided with an output shaft 12, the output shaft 12 is connected with the bottom of the workpiece tray 8, the first driving cylinder 9 provides power, and the first driving shaft 10 extends and retracts to realize the lifting of the pressing plate 7 connected with the first driving shaft 10; the rotating motor 11 is started, and the output shaft 12 rotates, namely, the workpiece tray 8 connected with the output shaft 12 is driven to rotate.

It should be understood that the first driving cylinder 9 (which may be a cylinder, a hydraulic cylinder) and the rotating motor 11 are conventional technical means in the art, and the working principle and function thereof are also common in the prior art and will not be described in detail herein.

The driving mechanism comprises a second driving cylinder 13 fixedly connected with the rack 1 and a second driving shaft 14 connected with the second driving cylinder 13, a first connecting plate 15 is arranged at the bottom of the lower supporting plate 4, the second driving shaft 14 is connected with the side part of the first connecting plate 15, the second driving cylinder 13 provides power, the second driving shaft 14 stretches and retracts to drive the first connecting plate 15 connected with the second driving shaft 14, and the whole supporting mechanism is driven to slide on the sliding rail 2, so that a workpiece clamped on the clamping mechanism is driven to displace.

It should be understood that the second driving cylinder 13 (which may be an air cylinder or a hydraulic cylinder) is a conventional technical means in the art, and the working principle and function thereof are also common in the prior art, and will not be described herein in detail.

The feeding mechanism comprises a second connecting plate 16 which is connected with the sliding body 3 and has an L-shaped longitudinal section, a third driving cylinder 17 which is connected with one side of the second connecting plate 16, which is far away from the lower supporting plate 4, and a third driving shaft 18 which is connected with the third driving cylinder 17, wherein one end of the third driving shaft 18, which is far away from the third driving cylinder 17, is provided with a first connecting block 19 and a second connecting block 20 which is connected with a bottom plate of the first connecting block 19, the top of the second connecting block 20 is provided with a first connecting piece 21, two ends of the first connecting piece 21 are respectively provided with a second connecting piece 22, the ends, which are far away from the first connecting piece 21, of the two connecting pieces 22 are rotatably provided with two feeding rollers 23, the planes of the two feeding rollers 23 are positioned between the pressure plate 7 and the workpiece tray 8, and the straight lines of the axes of the two feeding rollers 23 are parallel to the straight lines of the axes of the pressure plate 7 and the workpiece tray 8, the workpiece is placed between the workpiece tray 8 and the pressure plate 7 (the position of the workpiece is not completely aligned with the workpiece tray 8 and the pressure plate 7), then the driving cylinder III 17 is opened, the driving cylinder III 17 provides power, the driving shaft III 18 extends and retracts, the positions of the connecting block I19, the connecting block II 20, the connecting piece I21, the connecting piece II 22 and the two feeding rollers 23 connected with the driving shaft translate, the two feeding rollers 23 are translated to be in contact with the workpiece, then translation is continued, and the workpiece is pushed to be completely aligned with the positions of the workpiece tray 8 and the pressure plate 7 and can be used for machining. Wherein, set up feeding mechanism, promoted the degree of accuracy of pay-off, avoided artifical pay-off the degree of accuracy not enough and influence the processing effect.

It should be understood that the third driving cylinder 17 (which may be a pneumatic cylinder or a hydraulic cylinder) is a conventional technical means in the art, and the working principle and function thereof are also common in the prior art, and will not be described in detail herein.

The buffer mechanism comprises a sliding shaft 24 connected with the side part of the first connecting plate 15, a compression spring 25 connected with the rack 1 and a guide sleeve 26 sleeved in the middle of the sliding shaft 24, the compression spring 25 is connected with the sliding shaft 24, a guide rod 27 is arranged at the bottom end of the guide sleeve 26, the guide rod 27 is fixedly connected with the rack 1, when a part exceeding a set grinding pin amount or a local part of the workpiece has a large bulge, the workpiece pushes the clamping mechanism to displace, the clamping mechanism pushes the supporting mechanism to displace, the first connecting plate 15 drives the sliding shaft 24 to slide towards the compression spring 25, the compression spring 25 is compressed, the first connecting plate 15 cannot impact on the rack 1, the buffer effect is achieved, and the whole device is protected.

A fixing hole 28 is formed in the frame 1, a fixing gasket 29 is arranged on the compression spring 25, the diameter of the fixing gasket 29 is larger than the inner diameter of the fixing hole 28, a fixing screw 30 penetrating through the fixing hole 28 is arranged on the fixing gasket 29, a fixing nut 31 is connected to the fixing screw 30 in a threaded manner, the fixing nut 31 is abutted against the frame 1, the fixing screw 30 penetrates through the fixing hole 28, and the fixing nut 31 is screwed tightly, so that the compression spring 25 is fixed on the frame 1; the fixing nut 31 is unscrewed to separate the fixing screw 30 from the fixing hole 28, i.e. to separate the compression spring 25 from the frame 1, so that the compression spring 25 is convenient to replace when the compression spring 25 is old and needs to be replaced.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims

1. The utility model provides an automatic device of polisher emery wheel crashproof protection which characterized in that: including frame (1), set up in glide machanism on frame (1), be used for the fixture of centre gripping work piece, with the work piece is delivered to the feeding mechanism of fixture department, be used for supporting fixture's supporting mechanism, set up in actuating mechanism on frame (1) and be used for buffering the buffer gear of the impact that receives when the work piece is polished, actuating mechanism is used for the drive the supporting mechanism is in glide machanism goes up to slide, supporting mechanism with glide machanism slides and links to each other and is located glide machanism's top, actuating mechanism buffer gear all with the supporting mechanism links to each other and all is located supporting mechanism's below, feeding mechanism fixture all set up in on the supporting mechanism and all be located glide machanism's top.

2. The device for protecting the grinding wheel of an automatic grinding machine against collision according to claim 1, characterized in that: the sliding mechanism comprises sliding rails (2) arranged on the rack (1), wherein the two sliding rails (2) are horizontally arranged, and the two sliding rails (2) are parallel.

3. The device for protecting the grinding wheel of an automatic grinding machine against collision according to claim 2, characterized in that: the supporting mechanism include with slide rail (2) clearance fit's glide (3), set up in lower backup pad (4) at glide (3) top, be located last backup pad (5) and a plurality of bracing piece (6) of lower backup pad (4) top, a plurality of the both ends of bracing piece (6) respectively with go up backup pad (5) lower backup pad (4) are connected.

4. The device for protecting the grinding wheel of an automatic grinding machine against collision according to claim 3, wherein: the support rods (6) are four, and the joints of the support rods (6) and the upper support plate (5) and the joints of the support rods (6) and the lower support plate (4) are distributed in a rectangular shape.

5. The device for protecting the grinding wheel of an automatic grinding machine against collision according to claim 3, wherein: fixture includes liftable pressure disk (7) and rotatable work piece tray (8), pressure disk (7) are located directly over work piece tray (8), the axle center of pressure disk (7) with the axle center of work piece tray (8) is on same straight line.

6. The device for protecting the grinding wheel of an automatic grinding machine against collision according to claim 5, wherein: go up the top of backup pad (5) and be provided with driving cylinder (9), the bottom of driving cylinder (9) is provided with drive shaft (10), drive shaft (10) the top of pressure disk (7) links to each other, the bottom of lower backup pad (4) is provided with rotates motor (11), the top of rotating motor (11) is provided with output shaft (12), output shaft (12) with the bottom of work piece tray (8) links to each other.

7. The device for protecting the grinding wheel of an automatic grinding machine against collision according to claim 3, wherein: the driving mechanism comprises a second driving cylinder (13) fixedly connected with the rack (1) and a second driving shaft (14) connected with the second driving cylinder (13), a first connecting plate (15) is arranged at the bottom of the lower supporting plate (4), and the second driving shaft (14) is connected with the side part of the first connecting plate (15).

8. The device for protecting the grinding wheel of an automatic grinding machine against collision according to claim 5, wherein: the feeding mechanism comprises a connecting plate II (16) which is connected with the sliding body (3) and has an L-shaped longitudinal section, a driving cylinder III (17) which is connected with one side of the connecting plate II (16) departing from the lower supporting plate (4), and a driving shaft III (18) which is connected with the driving cylinder III (17), wherein one end of the driving shaft III (18) far away from the driving cylinder III (17) is provided with a connecting block I (19) and a connecting block II (20) which is connected with a bottom plate of the connecting block I (19), the top of the connecting block II (20) is provided with a connecting piece I (21), two ends of the connecting piece I (21) are respectively provided with a connecting piece II (22), the end parts of the two connecting piece II (22) far away from the connecting piece I (21) are rotatably provided with two feeding rollers (23), and the plane where the two feeding rollers (23) are positioned is positioned between the pressure plate (7) and the workpiece tray (8), the straight line where the axes of the two feeding rollers (23) are located is parallel to the straight line where the axes of the pressure plate (7) and the workpiece tray (8) are located.

9. The device for protecting the grinding wheel of an automatic grinding machine against collision according to claim 7, wherein: buffer gear include with slide shaft (24) that the lateral part of connecting plate (15) links to each other, with compression spring (25) that frame (1) links to each other and cup joint in two guide sleeve (26) in slide shaft (24) middle part, compression spring (25) with slide shaft (24) link to each other, two the bottom of guide sleeve (26) all is provided with guide bar (27), guide bar (27) with frame (1) is fixed links to each other.

10. The device for protecting the grinding wheel of an automatic grinding machine against impacts according to claim 9, characterized in that: the improved structure is characterized in that a fixing hole (28) is formed in the rack (1), a fixing gasket (29) is arranged on the compression spring (25), the diameter of the fixing gasket (29) is larger than the inner diameter of the fixing hole (28), a fixing screw rod (30) penetrating through the fixing hole (28) is arranged on the fixing gasket (29), a fixing nut (31) is connected to the fixing screw rod (30) in a threaded mode, and the fixing nut (31) is abutted to the rack (1).