CN212311042U

CN212311042U - Automatic saw blade grinding machine

Info

Publication number: CN212311042U
Application number: CN202021347798.4U
Authority: CN
Inventors: 雷涛
Original assignee: Hubei University of Science and Technology
Current assignee: Tongshan Chuangsheng Optical Co ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2021-01-08
Anticipated expiration: 2030-07-10

Abstract

The utility model provides an automatic saw blade grinding machine, which belongs to the technical field of electromechanical. It includes a frame, a saw blade to be processed, a synchronous shaft rotatably connected to the frame, a drive motor fixed on the frame, a grinding wheel arranged on the output shaft of the drive motor, and a transposition mechanism that drives the saw blade to be processed to rotate, The shifting mechanism includes a synchronizing gear fixed on the synchronizing shaft, the synchronizing gear has a number of teeth corresponding to the teeth on the saw blade to be processed one-to-one, and the frame is rotatably connected with at least one worm that meshes with the synchronizing gear, A fixed sleeve is slidably connected to the synchronous shaft, the saw blade to be processed is fixed on the fixed sleeve, the fixed sleeve is splined on the synchronous shaft, a longitudinal return spring is arranged between the fixed sleeve and the synchronous shaft, and a number of cams are fixed on the worm. The cam is rotatably connected to the worm, and the cam and the worm are connected by a torsion spring; the protruding part of the cam can drive the saw blade to be processed to move down longitudinally. The utility model has the advantages of high grinding efficiency.

Description

Automatic saw blade grinding machine

Technical Field

The utility model belongs to the technical field of electromechanics, a saw blade machine is sawed in automatic grinding is related to.

Background

Disc saw blades for processing wood, stone and the like are easy to have the problems of tooth edge pause, deformation, uneven abrasion and the like after being used for a period of time, and the performance of the saw blade needs to be repaired by polishing.

Among the prior art, the thickness of polishing of different tooth sword is the homogeneous in same saw bit, in order to avoid the emery wheel of polishing to the damage of saw bit, the thickness of single polishing is also very little, need polish (rotatory a plurality of circles) many times through polishing the saw bit, the thickness of polishing of accomplishing the saw bit is polished in the gradual increase, this kind of mode is uneven has very big weakening to polishing efficiency, and the adjustment process when the thickness is polished in the increase at every turn need be shut down, the operation is complicated, the structure is complicated, be unfavorable for the restoration operation of saw bit.

In fact, the teeth edges of the saw blade are worn differently in the using process, but as long as the edges are sharp, the performance influence is not great, and the specification, the size, the inclination angle and the like of each saw tooth are not required to be completely consistent through one-by-one wear.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem that exists to current technique, provide an automatic saw blade grinding machine, the utility model aims to solve the technical problem how simplify the structure, improve the efficiency of polishing.

The purpose of the utility model can be realized by the following technical proposal: an automatic saw blade grinding machine is characterized by comprising a frame, a saw blade to be processed, a synchronizing shaft rotationally connected to the frame, a driving motor fixed to the frame, a grinding wheel arranged on an output shaft of the driving motor and a transposition mechanism driving the saw blade to be processed to rotate, wherein the grinding wheel is positioned on one side of the saw blade to be processed, the transposition mechanism comprises a synchronizing gear fixed to the synchronizing shaft, a plurality of teeth which correspond to the teeth on the saw blade to be processed in a one-to-one mode are arranged on the synchronizing gear, at least one worm meshed with the synchronizing gear is rotationally connected to the frame, a fixing sleeve is slidably connected to the synchronizing shaft, the saw blade to be processed is fixed to the fixing sleeve, the fixing sleeve is in splined connection with the synchronizing shaft, a longitudinal reset spring is arranged between the fixing sleeve and the synchronizing shaft, a plurality of cams are fixedly arranged on the worm, and the, the cam is connected with the worm through a torsion spring; the protruding part of the cam can drive the saw blade to be processed to move downwards longitudinally; the grinding wheel can be inserted into a tooth groove of the saw blade to be processed in the downward moving process of the saw blade to be processed, and the grinding wheel can be abutted against a tooth blade of the saw blade to be processed in the rotating process of the saw blade to be processed.

The worm rotates for one circle to drive the rotation angle of the synchronous gear to be the same as the angle between adjacent tooth blades on the saw blade to be processed, so that the synchronous gear can just switch the processing positions of the grinding wheel and the saw blade to be processed to the adjacent positions after rotating every time.

The saw blade to be processed and the synchronous gear are coaxial, but the saw blade to be processed is attached with a certain amplitude of longitudinal motion every time the saw blade to be processed rotates, specifically, the motion in one rotation period of the saw blade to be processed is divided into three steps, namely, the saw blade to be processed is in a circular motion state of slowly moving downwards and rotating, longitudinally moving upwards by a small amplitude and stopping rotating, and longitudinally and rapidly moving upwards and rotating.

The saw blade to be processed slowly moves downwards and rotates: the salient points of the cam extrude the upper surface of the saw blade to be processed and are acted by a torsion spring, the rotating speed of the salient points of the cam is lower than that of the worm, the torsion spring stores force, the moving speed of the saw blade to be processed is lower, and the rotation is still synchronous with the synchronous gear; in this state, a certain tooth edge of the saw blade to be processed is being polished by the grinding wheel.

The saw blade to be processed longitudinally moves upwards in a small range and stops rotating: when the torsion spring is pressed to the limit, the salient point of the cam rapidly crosses the upper surface of the saw blade to be processed, in the process, the torsion spring releases torque to enable the cam to rapidly rotate, the worm hardly rotates, the downward pressure of the gear to be processed is weakened instantly and moves upwards under the action of contact friction force of the saw blade to be processed and the grinding wheel, and the upward movement amplitude of the saw blade to be processed is not large; in this state, a certain tooth edge of the saw blade to be processed needs to be separated from the grinding wheel after the grinding is finished.

The saw blade to be processed longitudinally moves up and rotates quickly: when the saw blade to be machined moves to the position where the saw blade is separated from the grinding position of the grinding wheel, a gap exists between the cam and the saw blade to be machined, the gear to be machined moves up quickly under the action of the longitudinal return spring, and then the worm drives the gear to be machined to rotate so as to switch the machining position, namely, the gear to be machined is switched to the next tooth blade.

When the saw blade to be processed moves downwards, the tooth edge is gradually contacted with the grinding wheel, so that the tooth edge and the grinding wheel are ground while being pressed tightly, before the saw blade to be processed is not extruded by the convex points of the cam, the saw blade to be processed is positioned above the grinding position of the grinding wheel, the saw blade to be processed and the grinding wheel are not contacted, namely, the horizontal plane of the intersection position of the plane of the grinding wheel and the axis of the grinding wheel is positioned below the horizontal plane of the saw blade to be processed.

It is not difficult to see, under this kind of mode, the structure is very simple, but can realize treating the needs of processing saw bit processing and the needs of switching processing position, and at the in-process of polishing, emery wheel and serrated edge position compress tightly the contact, avoid the serrated edge at different positions wearing and tearing the degree of difficulty of polishing that leads to the fact not in the use, among the prior art, emery wheel position of polishing is balanced with the thickness of polishing of serrated edge, make the less serrated edge of wearing and tearing excessively polish in the use, and the great serrated edge of wearing and tearing is failed to be polished or is polished and is not up to standard in the use.

In this scheme, servo motor just can realize corresponding action with certain speed continuous operation, comparatively speaking, the inching mode has the great, the precision of error accumulation is lower, the great scheduling problem of the control degree of difficulty, and the processing of treating the processing saw bit can once only be accomplished to the mode of continuous operation, and the precision is high, control is simple, convenient operation.

Furthermore, the number of the worms is two, the two worms are symmetrically distributed on two sides of the synchronous gear, the two worms are both fixedly provided with a transmission gear, the two transmission gears are meshed with each other, and one of the worms is connected with a servo motor.

The two worms synchronously and reversely rotate, so that the rotating precision of the synchronizing shaft is higher, the stability is better, the problem of inaccurate positioning of the synchronizing shaft caused by the installation clearance can be avoided, and the two worms can enable the synchronizing gear to be always in a clamping state.

Furthermore, an inclination angle of 80-85 degrees is formed between the axis of the grinding wheel and the axis of the saw blade to be processed.

The inclination angle is the inclination angle of the joint tooth blade on one hand, and on the other hand, the blade part is not damaged in the separation process of the saw blade to be processed and the grinding wheel.

Furthermore, the grinding wheel is connected with an output shaft of the driving motor through a clamping tool capable of buffering the grinding wheel; the clamping tool comprises a positioning shaft sleeve, two chucks and two pressing pieces in one-to-one correspondence with the chucks, the positioning shaft sleeve is fixedly connected with an output shaft of a driving motor, the middle of the positioning shaft sleeve is fixedly provided with a positioning piece inserted between the two chucks, the two chucks are fixedly connected, a positioning notch is formed in the inner side surface of the chuck, a ball bearing against the positioning piece rolls in the positioning notch, the pressing piece is in threaded connection with the corresponding chucks, a grinding wheel is fixed between the two pressing pieces, the chucks are connected with the positioning shaft sleeve through a plurality of spring columns, the spring columns are circumferentially and uniformly distributed outside the positioning shaft sleeve, and a movable gap is formed between the positioning shaft sleeve and the chucks.

Because treat the processing saw bit and emery wheel rigid contact can cause the impaired of treating the processing saw bit, also can cause the life of emery wheel to shorten, need make the emery wheel have the buffering effect with the in-process of treating the processing saw bit contact, but the position of treating the processing saw bit needs accurate location, only can realize through carrying out flexonics to the emery wheel.

The flexible connection of the grinding wheel can not change the plane of the running track of the grinding wheel, and the grinding precision can be seriously operated by the grinding wheel. In order to realize the purpose, the grinding wheel is fixed through the two chucks, the positioning sheet fixedly connected to the positioning shaft sleeve can slide between the two chucks, so that the positioning sheet and the positioning shaft sleeve cannot move relative to the axis direction of the grinding wheel, only the grinding wheel can move in the radial line direction of the positioning shaft sleeve, the deformation resistance of the spring column needs to be overcome in the process of realizing relative movement between the positioning sheet and the positioning shaft sleeve, the spring column can be compressed and bent, the grinding wheel can be buffered when being subjected to large radial impact force and rotating torque, the grinding wheel is prevented from being in relatively high-strength contact with the saw blade to be processed, the saw blade to be processed and the grinding wheel are protected, the processing quality can be improved, and the polishing dead angle at the bottom of the tooth blade part.

Furthermore, the chuck is in threaded connection with a locking nut positioned on the outer side of the pressing sheet.

The locking nut locks the pressing sheet for clamping the grinding wheel, so that the reliability and firmness of the grinding wheel are improved, the grinding wheel can be dislocated in the radial direction, and the requirement on the mounting precision of the grinding wheel is relatively reduced.

Furthermore, the two chucks are fixedly connected through a plurality of dismounting bolts, and the dismounting bolts are positioned on the outer sides of the positioning pieces.

The dismounting bolt is used for fixing the two chucks and limiting the moving range of the relative movement of the positioning plate and the chucks so as to control the maximum amplitude of the relative movement of the positioning plate and the chucks.

Drawings

FIG. 1 is a front view of the present automatic lapping and sawing machine.

Fig. 2 is a bottom view of fig. 1.

Fig. 3 is a top view of fig. 1.

Fig. 4 is a schematic plan view of the yarn wheel and the yarn wheel clamping tool.

Fig. 5 is a left side view of fig. 4.

Fig. 6 is a sectional view taken in the direction of a-a in fig. 5.

Fig. 7 is a sectional view of the synchronizing shaft and the fixing sleeve.

Fig. 8 is a cross-sectional view of the worm and cam.

In the figure, 1, a frame; 2. a saw blade to be processed; 31. a synchronizing shaft; 32. a drive motor; 33. a grinding wheel; 34. a synchronizing gear; 35. a worm; 36. fixing a sleeve; 37. a longitudinal return spring; 38. a cam; 39. a torsion spring; 41. a transmission gear; 42. a servo motor; 51. positioning the shaft sleeve; 52. a chuck; 53. a compression sheet; 54. positioning plates; 55. a ball bearing; 56. a spring post; 57. locking the nut; 58. and (6) disassembling and assembling the bolts.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2, 3, 7 and 8, the saw comprises a frame 1, a saw blade 2 to be processed, a synchronizing shaft 31 rotatably connected to the frame 1, a driving motor 32 fixed to the frame 1, a grinding wheel 33 arranged on an output shaft of the driving motor 32, and a transposition mechanism for driving the saw blade to be processed to rotate, wherein the transposition mechanism comprises a synchronizing gear fixed to the synchronizing shaft, the synchronizing gear 34 is provided with a plurality of teeth corresponding to the teeth on the saw blade 2 to be processed, at least one worm 35 engaged with the synchronizing gear 34 is rotatably connected to the frame 1, a fixing sleeve 36 is slidably connected to the synchronizing shaft 31, the saw blade 2 to be processed is fixed to the fixing sleeve 36, the fixing sleeve 36 is splined to the synchronizing shaft 31, a longitudinal return spring 37 is arranged between the fixing sleeve 36 and the synchronizing shaft, a plurality of cams 38 are fixedly arranged on the worm 35, and the cams 38 are rotatably connected to the, the cam 38 is connected with the worm 35 through a torsion spring 39; the protruding portion of the cam 38 is capable of driving the saw blade 2 to be processed to move down longitudinally.

The worm 35 rotates once to drive the synchronous gear 34 to rotate by the same angle as the angle between adjacent teeth on the saw blade 2 to be processed, so that the grinding wheel 33 can be switched to the adjacent position with respect to the processing position of the saw blade 2 to be processed just after each rotation of the synchronous gear 34.

The saw blade 2 to be processed and the synchronous gear 34 are coaxial, but each rotation of the saw blade 2 to be processed is accompanied by a certain amplitude of longitudinal movement, specifically, the action within one rotation period of the saw blade 2 to be processed is divided into three steps, namely, the circular movement of slowly moving downwards and rotating, longitudinally moving upwards by a small amplitude and stopping rotating, longitudinally and rapidly moving upwards and rotating is formed in sequence.

The saw blade 2 to be processed slowly moves downwards and rotates: the salient points of the cam 38 extrude the upper surface of the saw blade 2 to be processed and are acted by the torsion spring 39, the rotating speed of the salient points of the cam 38 is lower than that of the worm 35, the torsion spring 39 stores the force, the moving speed of the saw blade 2 to be processed is lower, and the rotation is still synchronous with the synchronous gear 34; in this state, a certain tooth edge of the saw blade 2 to be processed is being ground by the grinding wheel 33.

The saw blade 2 to be processed moves upwards and stops rotating in a small longitudinal range: when the torsion spring 39 is pressed to the limit, the salient point of the cam 38 rapidly crosses the upper surface of the saw blade 2 to be processed, in the process, the torsion spring 39 releases torque to enable the cam 38 to rapidly rotate, the worm 35 does not almost rotate, the downward pressure of the gear to be processed is weakened instantly to move upwards, the gear to be processed is acted by the contact friction force of the saw blade 2 to be processed and the grinding wheel 33, and the upward movement amplitude of the saw blade 2 to be processed is not large; in this state, it is necessary to separate the grinding wheel 33 from the blade edge of the saw blade 2 to be processed after the grinding operation.

The saw blade 2 to be processed is quickly moved up and rotated in the longitudinal direction: when the saw blade 2 to be machined moves upwards to be separated from the grinding position of the grinding wheel 33, a gap exists between the cam 38 and the saw blade 2 to be machined, the gear to be machined moves upwards rapidly under the action of the longitudinal return spring 37, and then the worm 35 drives the gear to be machined to rotate so as to switch the machining position, namely the next tooth edge.

When the saw blade 2 to be processed moves downwards, the tooth edges are gradually contacted with the grinding wheel 33, so that the tooth edges and the grinding wheel 33 are ground while being pressed, before the saw blade 2 to be processed is not pressed by the salient points of the cam 38, the saw blade 2 to be processed is positioned above the grinding position of the grinding wheel 33, the two are not contacted at the moment, namely, the horizontal plane of the intersection position of the plane of the grinding wheel 33 and the axis of the grinding wheel 33 is positioned below the horizontal plane of the saw blade 2 to be processed.

It can be seen that, under this kind of mode, the structure is very simple, but can realize treating the needs of processing saw bit 2 processing and the needs of switching processing position, and at the in-process of polishing, emery wheel 33 and serrated edge position compress tightly the contact, avoid the serrated edge at different positions wearing and tearing the degree of difficulty of polishing that leads to the fact not in the use, among the prior art, emery wheel 33 polishes the thickness of polishing position and serrated edge and is balanced, make the less serrated edge of wearing and tearing excessively polish in the use, and the great serrated edge of wearing and tearing is failed to be polished or is polished and is not up to standard in the use.

In this scheme, servo motor 42 just can realize corresponding action with certain speed continuous operation, comparatively speaking, the inching mode has the great, the precision of error accumulation is lower, the great scheduling problem of the control degree of difficulty, and the processing of treating the processing saw bit can once only be accomplished to the mode of continuous operation, and the precision is high, control is simple, convenient operation.

Two worm gears 35 are provided, the two worm gears 35 are symmetrically distributed on two sides of the synchronous gear 34, a transmission gear 41 is fixedly arranged on each of the two worm gears 35, the two transmission gears 41 are meshed with each other, and one of the worm gears 35 is connected with a servo motor 42. The two worms 35 rotate in the opposite directions synchronously, so that the rotating precision of the synchronizing shaft 31 is high, the stability is good, the problem that the positioning of the synchronizing shaft 31 is inaccurate due to installation gaps can be avoided, and the two worms 35 can enable the synchronizing gear 34 to be in a clamping state all the time.

An inclination angle of 80-85 degrees is formed between the axis of the grinding wheel 33 and the axis of the saw blade 2 to be processed. The inclination angle is the inclination angle of the joint tooth blade on one hand, and on the other hand, the blade part is not damaged in the separation process of the saw blade 2 to be processed and the grinding wheel 33.

As shown in fig. 4, 5 and 6, the grinding wheel 33 is connected to an output shaft of the drive motor 32 via a clamping tool capable of buffering the grinding wheel 33; the clamping tool comprises a positioning shaft sleeve 51, two chucks 52 and two pressing sheets 53 in one-to-one correspondence with the chucks 52, the positioning shaft sleeve 51 is fixedly connected with an output shaft of the driving motor 32, a positioning sheet 54 inserted between the two chucks 52 is fixedly arranged in the middle of the positioning shaft sleeve 51, the two chucks 52 are fixedly connected, a positioning notch is formed in the inner side surface of each chuck 52, a ball 55 abutting against the positioning sheet 54 rolls in the positioning notch, the pressing sheets 53 are in threaded connection with the corresponding chucks 52, the grinding wheel 33 is fixed between the two pressing sheets 53, the chucks 52 are connected with the positioning shaft sleeve 51 through a plurality of spring columns 56, the spring columns 56 are circumferentially and uniformly distributed outside the positioning shaft sleeve 51, and a movable gap is formed between the positioning shaft sleeve 51 and the chucks 52.

Because the rigid contact of saw bit 2 and emery wheel 33 of waiting to process can cause the damage of saw bit 2 of waiting to process, also can cause the life of emery wheel 33 to shorten, need make emery wheel 33 have the buffering effect with the in-process of waiting to process saw bit 2 contact, but the position of saw bit 2 of waiting to process needs accurate location, only can realize through carrying out flexonics to emery wheel 33.

The flexible connection of the grinding wheel 33 can not change the plane of the running track of the grinding wheel 33, and the grinding precision can not be seriously operated. In order to achieve the purpose, the grinding wheel 33 is fixed through the two chucks 52, the positioning sheet 54 fixedly connected to the positioning shaft sleeve 51 can slide between the two chucks 52, so that the positioning sheet 54 and the positioning shaft sleeve 51 cannot move relative to the axis direction of the grinding wheel 33, only the grinding wheel 33 can move in the radial line direction of the positioning shaft sleeve 51, the deformation resistance of the spring column 56 needs to be overcome in the process of realizing the relative movement of the positioning sheet 54 and the positioning shaft sleeve 51, and the spring column 56 can be compressed and bent, so that the grinding wheel 33 can buffer when being subjected to large radial impact force and rotating torque, and the grinding wheel 33 is prevented from being in relatively high-strength contact with the saw blade 2 to be processed, the saw blade 2 to be processed and the grinding wheel 33 are protected, the processing quality can be improved, and the grinding dead angle at the bottom.

A lock nut 57 located outside the pressing piece 53 is threadedly coupled to the chuck 52. The lock nut 57 locks the pressing piece 53 holding the grinding wheel 33, and improves the reliability and the firmness of the grinding wheel 33, and the requirement for the mounting accuracy of the grinding wheel 33 is relatively lowered because the grinding wheel 33 can be displaced in the radial direction.

The two chucks 52 are fixedly connected by a plurality of assembling and disassembling bolts 58, and the assembling and disassembling bolts 58 are positioned at the outer sides of the positioning plates 54. The dismounting bolt 58 is used for fixing the two clamping discs 52, and also used for limiting the moving range of the relative movement between the positioning plate 54 and the clamping discs 52 so as to control the maximum amplitude of the relative movement.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. An automatic saw blade grinding machine, characterized in that it comprises a frame (1), a saw blade (2) to be processed, a synchronous shaft (31) rotatably connected to the frame (1), and a synchronous shaft (31) fixed on the frame (1). 1) on the driving motor (32), the grinding wheel (33) arranged on the output shaft of the driving motor (32), and the transposition mechanism for driving the saw blade (2) to be processed to rotate, the grinding wheel (33) is located at the position to be processed. On one side of the saw blade (2), the shifting mechanism includes a synchronizing gear (34) fixed on the synchronizing shaft (31), and the synchronizing gear (34) has a plurality of The serrations correspond to the teeth one by one, the frame (1) is rotatably connected with at least one worm (35) that meshes with the synchronizing gear (34), and the synchronizing shaft (31) is slidably connected with a fixed sleeve (35). 36), the saw blade (2) to be processed is fixed on a fixed sleeve (36), the fixed sleeve (36) is splined on the synchronizing shaft (31), and the fixed sleeve (36) is connected to the synchronizing shaft. A longitudinal return spring (37) is arranged between the worms (35), and a plurality of cams (38) are fixedly arranged on the worm (35). 35) are connected by a torsion spring (39); the protruding part of the cam (38) can drive the saw blade (2) to be processed downward longitudinally; the grinding wheel (33) can move down the saw blade to be processed During the process, the grinding wheel (33) is inserted into the tooth groove of the saw blade (2) to be processed, and the grinding wheel (33) can abut against the tooth edge of the saw blade (2) to be processed during the rotation process of the saw blade (2).

2. The automatic saw blade grinding machine according to claim 1, characterized in that, there are two worms (35), and the two worms (35) are symmetrically distributed on both sides of the synchronizing gear (34), and two A transmission gear (41) is fixedly arranged on the worm (35), and the two transmission gears (41) are meshed with each other, and one of the worms (35) is connected with a servo motor (42).

3. The automatic saw blade grinding machine according to claim 1 or 2, wherein the axis of the grinding wheel (33) and the axis of the saw blade (2) to be processed are at an angle of 80-85° inclination.

4. The automatic saw blade grinding machine according to claim 1 or 2, wherein the grinding wheel (33) is output by a clamping tool capable of buffering the grinding wheel (33) and the driving motor (32) shafts are connected to each other; the clamping tool includes a positioning sleeve (51), two chucks (52) and two pressing pieces (53) corresponding to the chucks (52) one-to-one, the positioning sleeve (51) ) is fixedly connected with the output shaft of the drive motor (32), the middle of the positioning sleeve (51) is fixedly provided with a positioning piece (54) inserted between the two clamping discs (52), the two clamping The discs (52) are fixedly connected, the inner side of the chuck (52) is provided with a positioning recess, and a ball (55) abutting on the positioning sheet (54) is rolled in the positioning recess, and the pressing sheet is (53) is screwed on the corresponding chuck (52), the grinding wheel (33) is fixed between the two pressing plates (53), and between the chuck (52) and the positioning shaft sleeve (51) Connected by a plurality of spring columns (56), the spring columns (56) are evenly distributed outside the positioning shaft sleeve (51) in the circumferential direction, and there is a movable gap between the positioning shaft sleeve (51) and the chuck (52).

5 . The automatic saw blade grinding machine according to claim 4 , wherein a locking nut ( 57 ) located on the outer side of the pressing plate ( 53 ) is threadedly connected to the chuck ( 52 ). 6 .

6 . The automatic saw blade sharpening machine according to claim 4 , wherein the two chucks ( 52 ) are fixedly connected by a plurality of disassembly bolts ( 58 ), and the disassembly bolts ( 58 ) are located at the positioning outside of the sheet (54).