CN115922541A

CN115922541A - Automobile crankshaft surface polishing device

Info

Publication number: CN115922541A
Application number: CN202310032782.6A
Authority: CN
Inventors: 陈君宝; 陈勇; 胡明茂
Original assignee: Hubei Zhongcheng Technology Industry Technology Research Institute Co ltd; Hubei University of Automotive Technology
Current assignee: Hubei Zhongcheng Technology Industry Technology Research Institute Co ltd; Hubei University of Automotive Technology
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-04-07

Abstract

The invention discloses a polishing device for the surface of an automobile crankshaft, which comprises an operation platform, wherein a supporting piece is fixed at the top end of the operation platform, and two ends of the crankshaft are fixed on the supporting piece and rotate relative to the supporting piece; the base is connected to the top end of the operation platform in a sliding mode, the top end of the base is connected with a polishing piece in a sliding mode, the polishing piece comprises a rough polishing wheel and a fine polishing wheel which move synchronously, and the crankshaft is located between the rough polishing wheel and the fine polishing wheel; the buckling piece is arranged on one side of the polishing piece, one end of the buckling piece is rotatably connected with the top end of the base, the other end of the buckling piece is detachably connected with the base, and the bottom end of the buckling piece is matched with the top end of the base and used for clamping the extending end on the polishing piece. The crankshaft polishing wheel can change the size of the crankshaft and facilitate the adjustment of the positions of two types of polishing wheels in the process of polishing the crankshaft, and the fixing effect is good.

Description

Automobile crankshaft surface polishing device

Technical Field

The invention relates to the technical field of crankshaft machining, in particular to an automobile crankshaft surface polishing device.

Background

The crankshaft is used as a main rotating part of the engine, the connecting rod can convert the up-and-down reciprocating motion of the connecting rod into the rotating motion after being arranged, and the main journal needs to be polished during the processing of the crankshaft in order to reduce the abrasion of the main journal during working.

Among the prior art, there is the equipment that is used for polishing the bent axle, but when the size of bent axle changes, the regulation polishing equipment that need be for go up the relative position of grinding wheel and bent axle to the realization is to the normal of bent axle being polished, and present polishing process is mainly for carrying out preliminary polishing earlier and then finely polishing simultaneously, and the position control of the grinding wheel among the existing equipment is comparatively loaded down with trivial details, and the stable effect after changing the position is relatively poor.

Therefore, the polishing device for the surface of the automobile crankshaft is provided, the positions of two types of polishing wheels can be conveniently adjusted in the processes of crankshaft size change and crankshaft polishing, and the fixing effect is good.

Disclosure of Invention

The invention aims to provide an automobile crankshaft surface polishing device, which is used for solving the problems in the prior art, can realize the purpose of conveniently adjusting the positions of two types of polishing wheels in the processes of crankshaft size change and crankshaft polishing, and has a good fixing effect.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a polishing device for the surface of an automobile crankshaft, which comprises,

the top end of the operating platform is fixedly provided with a supporting piece, and two ends of the crankshaft are fixed on the supporting piece and rotate relative to the supporting piece;

the base is connected to the top end of the operation platform in a sliding mode, the top end of the base is connected with a grinding piece in a sliding mode, the grinding piece comprises a rough grinding wheel and a fine grinding wheel which move synchronously, and the crankshaft is located between the rough grinding wheel and the fine grinding wheel;

the buckling piece is arranged on one side of the polishing piece, one end of the buckling piece is rotatably connected with the top end of the base, the other end of the buckling piece is detachably connected with the base, and the bottom end of the buckling piece is matched with the top end of the base to clamp an extending end on the polishing piece;

the fixing assembly comprises an adjusting piece and a clamping piece, the polishing piece is located between the adjusting piece and the clamping piece, the adjusting piece is in transmission connection with the rough polishing wheel, the clamping piece is abutted against one end of the fine polishing wheel, the movable end of the buckling piece is close to the clamping piece, a connecting piece is arranged at the top end of the base, and the connecting piece is connected with the clamping piece in a clamping manner through the movable end of the buckling piece.

Preferably, roughly polish the wheel with finely polish the wheel overcoat and be equipped with the dustcoat, the dustcoat with roughly polish the wheel with finely polish the wheel and rotate the connection, roughly polish the dustcoat outer wall rigid coupling that takes turns to and have first slide, finely polish the dustcoat outer wall rigid coupling that takes turns to and have the second slide, the spout has been seted up on the base top, first slide with the second slide all is located in the spout and with the spout adaptation, first slide with be fixed with the dead lever between the second slide.

Preferably, the holding tank is arranged at the top end of the base, the buckling piece comprises a buckling plate arranged in the holding tank, a rotating rod penetrates through one end, close to the rough grinding wheel, of the buckling plate, the rotating rod is fixedly connected with the base, the buckling plate is rotatably connected with the rotating rod, the buckling plate is located below the crankshaft, the extending end is a limiting plate fixedly connected with one side, close to the holding tank, of the first sliding seat and the second sliding seat, the limiting plate is located between the bottom end of the buckling plate and the top end of the base, and the bottom end of the buckling plate and the top end of the base are matched to clamp the limiting plate.

Preferably, a supporting block is fixedly connected in the accommodating groove, a lock rod is fixedly connected to the top end of the supporting block, a locking plate is rotatably connected to the top end of the lock rod, a through groove is formed in the top end of the buckling plate, the locking plate is matched with the through groove, and the locking plate is located above the buckling plate.

Preferably, the adjusting part comprises an adjusting screw rod, the adjusting screw rod penetrates through one end of the base and extends into the sliding groove, and one end of the adjusting screw rod is rotatably connected with the first sliding seat.

Preferably, the spout with the holding tank passes through the opening intercommunication, the connecting piece is including setting up torsion bar in the opening, the rigid coupling has the connecting plate on the torsion bar, the one end of connecting plate with the fastener corresponds the setting, the rigid coupling has the frame plate in the holding tank, wear to be equipped with the carriage release lever on the frame plate, the buckle plate be close to the one end of carriage release lever for the inclined plane and with the carriage release lever adaptation, the other end of carriage release lever with the connecting plate butt.

Preferably, the fastener is including setting up cardboard in the spout, cardboard lateral wall rigid coupling has a plurality of blocks protrudingly, the connecting plate with the protruding butt of card, the base is kept away from the one end rigid coupling of rough grinding wheel has the carriage, sliding connection has the diving board in the carriage, the diving board is close to one side of cardboard with the cardboard rigid coupling, the other end rigid coupling of diving board has compression spring, compression spring's the other end with carriage inner wall rigid coupling.

Preferably, the supporting part comprises two supporting frames fixed at the top end of the operating platform, one side of each supporting frame, which is close to the crankshaft, is fixedly connected with a clamping flange plate matched with the two ends of the crankshaft, and the clamping flange plates are connected with a driving motor in a transmission manner.

Preferably, a moving groove is formed in the top end of the operating platform, a moving plate matched with the moving groove is fixedly connected to the bottom end of the base, a telescopic cylinder is fixedly connected to one end of the operating platform, and the movable end of the telescopic cylinder is fixedly connected with the moving plate.

The invention discloses the following technical effects:

1. the rough grinding wheel and the fine grinding wheel move synchronously, so that when the rough grinding wheel is used for grinding the crankshaft, the fine grinding wheel is far away from the normal rotation in the crankshaft unaffected region, and switching of the two grinding wheels is facilitated.

2. Through buckling piece and fastener cooperation, when the buckling piece was to the extension end centre gripping of rough grinding wheel and fine grinding wheel, promote the connecting piece through the buckling piece and realize the fixed to the fastener to realize the fixed of rough grinding wheel and fine grinding wheel, its fixed effect is better.

3. The positions of the rough grinding wheel and the fine grinding wheel can be adjusted by releasing the locking state of the buckling piece, and the adjustment is convenient.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in 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 inventive exercise.

FIG. 1 is a perspective view of a polishing apparatus;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a perspective view of the moving abrading article;

FIG. 5 is a partial enlarged view of the portion B in FIG. 4;

FIG. 6 is a perspective view of the connection of the base to the abrading article;

the device comprises a workbench, a crankshaft, a base, a coarse grinding wheel, a fine grinding wheel, a cover, a first sliding seat, a second sliding seat, a sliding groove, a 10-fixing rod, a 11-accommodating groove, a 12-buckling plate, a 13-rotating rod, a 14-limiting plate, a 15-supporting block, a 16-locking rod, a 17-locking plate, an 18-through groove, a 19-adjusting screw rod, a 20-notch, a 21-torsion rod, a 22-connecting plate, a 23-frame plate, a 24-moving rod, a 25-clamping plate, a 26-clamping boss, a 27-connecting frame, a 28-elastic plate, a 29-compression spring, a 30-supporting frame, a 31-clamping flange plate, a 32-driving motor, a 33-moving groove, a 34-moving plate and a 35-telescopic cylinder, wherein the workbench is arranged on the workbench, the crankshaft, the base, the coarse grinding wheel, the rotating plate and the fine grinding wheel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.

Referring to fig. 1-6, the invention provides a polishing device for the surface of an automobile crankshaft, which comprises a workbench 1, wherein a supporting piece is fixed at the top end of the workbench 1, and two ends of a crankshaft 2 are fixed on the supporting piece and rotate relative to the supporting piece; the base 3 is connected to the top end of the operation platform 1 in a sliding mode, the top end of the base 3 is connected with a polishing piece in a sliding mode, the polishing piece comprises a coarse polishing wheel 4 and a fine polishing wheel 5 which move synchronously, and the crankshaft 2 is located between the coarse polishing wheel 4 and the fine polishing wheel 5; the buckling piece is arranged on one side of the polishing piece, one end of the buckling piece is rotatably connected with the top end of the base 3, the other end of the buckling piece is detachably connected with the base 3, and the bottom end of the buckling piece is matched with the top end of the base 3 and used for clamping an extending end on the polishing piece; the fixing assembly comprises an adjusting piece and a clamping piece, the polishing piece is located between the adjusting piece and the clamping piece, the adjusting piece is in transmission connection with the coarse polishing wheel 4, the clamping piece is abutted to one end of the fine polishing wheel 5, the movable end of the clamping piece is close to the clamping piece, a connecting piece is arranged on the top end of the base 3, and the connecting piece is connected with the clamping piece in a clamping mode through the movable end of the clamping piece.

When carrying out the trunnion of bent axle 2 and polishing, fix the both ends of bent axle 2 on support piece, the rotation regulating part, make rough grinding wheel 4 be close to bent axle 2, treat after rough grinding wheel 4 position control finishes, remove the buckling piece and lock the buckling piece, the buckling piece is fixed to rough grinding wheel 4 and the extension end centre gripping of thin grinding wheel 5 with the top cooperation of base 3, and simultaneously, the buckling piece contacts with the connecting piece, promote the connecting piece and remove the joint that realizes connecting piece and fastener, thereby the fastener can't remove under the effect of buckling piece and fix rough grinding wheel 4 and thin grinding wheel 5, start support piece afterwards, make bent axle 2 rotatory, earlier preliminarily polish bent axle 2, treat after preliminarily polishing, remove the locking of buckling piece, remove rough grinding wheel 4 and thin grinding wheel 5 position, make thin grinding wheel 5 and bent axle 2 contact, fix it afterwards and carry out subsequent meticulous polishing.

Wherein, the rough grinding wheel 4 can be selected from an oilstone grinding wheel, and the fine grinding wheel 5 can be selected from a sand paper grinding wheel.

Further optimize the scheme, 5 overcoat of wheel 4 and the thin emery wheel of polishing are equipped with dustcoat 6 for the thick emery wheel of polishing, dustcoat 6 rotates with wheel 4 and the thin emery wheel of polishing 5 for the thick emery wheel of polishing and is connected, 6 outer wall rigid couplings of dustcoat on the wheel 4 of polishing have first slide 7 for the thick emery wheel of polishing, 6 outer wall rigid couplings of dustcoat on the thin emery wheel of polishing 5 have second slide 8, spout 9 has been seted up on 3 tops of base, first slide 7 and second slide 8 all be located spout 9 and with spout 9 adaptations, be fixed with dead lever 10 between first slide 7 and the second slide 8.

The outer cover 6 is used for supporting the rough grinding wheel 4 and the fine grinding wheel 5, the first slide carriage 7 and the second slide carriage 8 are fixedly connected through a fixing rod 10, so that the first slide carriage 7 and the second slide carriage 8 can synchronously move in the sliding groove 9 to realize the synchronous movement of the rough grinding wheel 4 and the fine grinding wheel 5,

further optimization scheme, holding tank 11 has been seted up on 3 tops of base, the buckling piece is including setting up buckle board 12 in holding tank 11, the bull stick 13 is worn to be equipped with by buckle board 12 near the one end of rough grinding wheel 4,

bull stick

13 and 3 rigid couplings of base, buckle board 12 rotates with bull stick 13 to be connected, buckle board 12 is located 2 belows of bent axle, the extension end is limiting plate 14 that first slide 7 and second slide 8 are close to one side rigid coupling of holding tank 11, limiting plate 14 is located between buckle board 12 bottom and 3 tops of base, and buckle board 12 bottom and 3 tops of base cooperation centre gripping limiting plate 14.

Holding tank 11 is used for placing buckled plate 12, and buckled plate 12's one end is passed through bull stick 13 and is connected with base 3 rotation, and its other end can open and shut the activity near the one end of fine grinding wheel 5 promptly, and buckled plate 12 is located bent axle 2 below simultaneously, therefore buckled plate 12 can open and shut and rotate certain angle and relieve the centre gripping to limiting plate 14, and limiting plate 14 uses as the extension end of first slide 7 and second slide 8, and it uses with buckled plate 12 cooperation.

Further, a handle is fixed on the top end of the buckling plate 12. The presence of the handle facilitates the operator to rotate the opening of the snap-together plate 12.

Further optimization scheme, the supporting block 15 is fixedly connected in the accommodating groove 11, the lock rod 16 is fixedly connected to the top end of the supporting block 15, the lock rod 16 is rotatably connected to the top end of the lock rod 17, the through groove 18 is formed in the top end of the buckling plate 12, the lock plate 17 is matched with the through groove 18, and the lock plate 17 is located above the buckling plate 12. The lock plate 17 is rotatable with respect to the lock lever 16.

It can be understood that when the lock plate 14 is clamped, the lock plate 17 is perpendicular to the through groove 18, and in this state, the lock plate 17 cannot be matched with the through groove 18, so that the lock plate 17 is used for limit locking of the snap plate 12, and when the rough grinding wheel 4 and the fine grinding wheel 5 need to be moved, the lock plate 17 is rotated to match the lock plate 17 with the through groove 18, and in this state, the snap plate 12 can be opened.

Further optimize the scheme, the regulating part includes an adjusting screw 19, adjusting screw 19 wears to establish in the one end of base 3 and stretches into spout 9, and adjusting screw 19's one end is rotated with first slide 7 and is connected. The adjusting screw 19 is in threaded connection with the base 3, and when the adjusting screw 19 is rotated, the first slide 7 can be driven to move.

Specifically, the end of the adjusting screw 19 is connected to the first slide 7 through a bearing, so that the adjusting screw 19 drives the first slide 7 to move and rotate relative to the first slide 7.

Further optimize the scheme, spout 9 and holding tank 11 pass through opening 20 intercommunication, and the connecting piece is including setting up torsion bar 21 in opening 20, and the rigid coupling has connecting plate 22 on torsion bar 21, and the one end of connecting plate 22 corresponds the setting with the fastener, and the rigid coupling has frame plate 23 in the holding tank 11, wears to be equipped with carriage release lever 24 on the frame plate 23, and the one end that buckling plate 12 is close to carriage release lever 24 is the inclined plane and with carriage release lever 24 adaptation, the other end and the connecting plate 22 butt of carriage release lever 24.

It can be understood that, because one end of the buckling plate 12 close to the moving bar 24 is an inclined surface, when the buckling plate 12 is buckled, one end of the buckling plate 12 presses the moving bar 24, the other end of the moving bar 24 presses the connecting plate 22 to enable the connecting plate to be in a state vertical to the fastener, meanwhile, the connecting plate 22 is clamped with the fastener, locking of the first sliding seat 7 and the second sliding seat 8 is achieved, and when the buckling plate 12 does not press the moving bar 24 any more, the torsion bar 21 drives the connecting plate 22 to move under the self-action, so that the moving bar 24 is reset.

Specifically, the torsion bar 21 has a rod structure and a torsion spring (not shown), when the connecting plate 22 is not pressed by the moving rod 24, the torsion bar 21 makes the connecting plate 22 incline under the action of its own elasticity, and the connecting plate 22 is not clamped with the clamping member in this state, and meanwhile, the normal movement of the clamping member is not affected.

Further optimize the scheme, the fastener is including setting up the cardboard 25 in spout 9, cardboard 25 lateral wall rigid coupling has a plurality of protruding 26 of card, connecting plate 22 and the protruding 26 butt of card, the one end rigid coupling that rough grinding wheel 4 was kept away from to base 3 has a connection box 27, sliding connection has an elastic plate 28 in the connection box 27, one side and cardboard 25 rigid coupling that elastic plate 28 is close to cardboard 25, elastic plate 28's other end rigid coupling has compression spring 29, compression spring 29's the other end and the rigid coupling of connection box 27 inner wall. Protruding 26 of card and the cooperation of connecting plate 22 realize mutual joint, thereby make cardboard 25 unable removal, this structure cooperation adjusting screw 19 can be effectively fixed to first slide 7 and second slide 8, when connecting plate 22 does not contact with protruding 26 of card, when removing first slide 7, second slide 8 is followed and is removed, consequently compression spring 29 drives diving board 28 and removes, drive cardboard 25 by diving board 28 and remove, make cardboard 25 all the time with one side butt of second slide 8, when connecting plate 22 contacts with protruding 26 of card, can lock second slide 8.

According to the further optimization scheme, the supporting pieces comprise two supporting frames 30 fixed to the top end of the operation platform 1, one sides, close to the crankshaft 2, of the two supporting frames 30 are fixedly connected with clamping flange discs 31 matched with the two ends of the crankshaft 2 respectively, and any one of the clamping flange discs 31 is connected with a driving motor 32 in a transmission mode. The clamping flange 31 may be of an existing clamping construction, and the presence of the drive motor 32 is used to ensure rotation of the crankshaft 2.

According to the further optimized scheme, the top end of the operation platform 1 is provided with a moving groove 33, the bottom end of the base 3 is fixedly connected with a moving plate 34 matched with the moving groove 33, one end of the operation platform 1 is fixedly connected with a telescopic cylinder 35, and the movable end of the telescopic cylinder 35 is fixedly connected with the moving plate 34. The position of the base 3 on the work table 1 is adjusted by the telescopic cylinder 35.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims

1. The utility model provides an automobile crankshaft surface finish device which characterized in that: comprises the steps of (a) preparing a substrate,

the device comprises a workbench (1), wherein a supporting piece is fixed at the top end of the workbench (1), and two ends of a crankshaft (2) are fixed on the supporting piece and rotate relative to the supporting piece;

the base (3) is connected to the top end of the operation platform (1) in a sliding mode, the top end of the base (3) is connected with a grinding piece in a sliding mode, the grinding piece comprises a rough grinding wheel (4) and a fine grinding wheel (5) which move synchronously, and the crankshaft (2) is located between the rough grinding wheel (4) and the fine grinding wheel (5);

the buckling piece is arranged on one side of the polishing piece, one end of the buckling piece is rotatably connected with the top end of the base (3), the other end of the buckling piece is detachably connected with the base (3), and the bottom end of the buckling piece is matched with the top end of the base (3) and used for clamping the extending end on the polishing piece;

the fixing assembly comprises an adjusting piece and a clamping piece, the polishing piece is located between the adjusting piece and the clamping piece, the adjusting piece is in transmission connection with the rough polishing wheel (4), the clamping piece is abutted against one end of the fine polishing wheel (5), the movable end of the buckling piece is close to the clamping piece, a connecting piece is arranged at the top end of the base (3), and the connecting piece is clamped with the clamping piece through the movable end of the buckling piece.

2. The automotive crankshaft surface polishing device according to claim 1, characterized in that: roughly beat emery wheel (4) with finely beat emery wheel (5) overcoat and be equipped with dustcoat (6), dustcoat (6) with roughly beat emery wheel (4) with finely beat emery wheel (5) and rotate the connection, dustcoat (6) outer wall rigid coupling on roughly beat emery wheel (4) has first slide (7), finely beat dustcoat (6) outer wall rigid coupling on emery wheel (5) have second slide (8), spout (9) have been seted up on base (3) top, first slide (7) with second slide (8) all are located in spout (9) and with spout (9) adaptation, first slide (7) with be fixed with dead lever (10) between second slide (8).

3. The automotive crankshaft surface polishing device according to claim 2, characterized in that: holding tank (11) have been seted up on base (3) top, the buckling piece is including setting up buckling plate (12) in holding tank (11), turning bar (13) are worn to be equipped with by buckling plate (12) near the one end of rough grinding wheel (4), turning bar (13) with base (3) rigid coupling, buckling plate (12) with turning bar (13) rotate to be connected, buckling plate (12) are located bent axle (2) below, the extension end is first slide (7) and second slide (8) are close to limiting plate (14) of one side rigid coupling of holding tank (11), limiting plate (14) are located between buckling plate (12) bottom and base (3) top, just buckling plate (12) bottom with base (3) top cooperation centre gripping limiting plate (14).

4. The automotive crankshaft surface polishing device according to claim 3, wherein: the locking device is characterized in that a supporting block (15) is fixedly connected into the accommodating groove (11), a locking rod (16) is fixedly connected to the top end of the supporting block (15), a locking plate (17) is rotatably connected to the top end of the locking rod (16), a through groove (18) is formed in the top end of the buckling plate (12), the locking plate (17) is matched with the through groove (18), and the locking plate (17) is located above the buckling plate (12).

5. The automotive crankshaft surface polishing device according to claim 2, wherein: the adjusting part comprises an adjusting screw rod (19), the adjusting screw rod (19) penetrates through one end of the base (3) and extends into the sliding groove (9), and one end of the adjusting screw rod (19) is rotatably connected with the first sliding seat (7).

6. The automotive crankshaft surface polishing device according to claim 3, characterized in that: spout (9) with holding tank (11) are through opening (20) intercommunication, the connecting piece is including setting up torsion bar (21) in opening (20), the rigid coupling has connecting plate (22) on torsion bar (21), the one end of connecting plate (22) with the fastener corresponds the setting, the rigid coupling has frame plate (23) in holding tank (11), wear to be equipped with carriage release lever (24) on frame plate (23), lock board (12) are close to the one end of carriage release lever (24) be the inclined plane and with carriage release lever (24) adaptation, the other end of carriage release lever (24) with connecting plate (22) butt.

7. The automotive crankshaft surface polishing device as set forth in claim 6, wherein: fastener is including setting up cardboard (25) in spout (9), cardboard (25) lateral wall rigid coupling has a plurality of protruding (26) of card, connecting plate (22) with protruding (26) butt of card, base (3) are kept away from the one end rigid coupling of rough grinding wheel (4) has connecting frame (27), sliding connection has springboard (28) in connecting frame (27), springboard (28) are close to one side of cardboard (25) with cardboard (25) rigid coupling, the other end rigid coupling of springboard (28) has compression spring (29), the other end of compression spring (29) with connecting frame (27) inner wall rigid coupling.

8. The automotive crankshaft surface polishing device according to claim 1, characterized in that: the support piece is including fixing two support frames (30) on operation platform (1) top, two support frame (30) are close to one side of bent axle (2) respectively the rigid coupling have with the centre gripping flange dish (31) of bent axle (2) both ends adaptation, arbitrary centre gripping flange dish (31) transmission is connected with driving motor (32).

9. The automotive crankshaft surface polishing device according to claim 1, characterized in that: moving slot (33) have been seted up on operation platform (1) top, base (3) bottom rigid coupling have with moving plate (34) of moving slot (33) adaptation, the one end rigid coupling of operation platform (1) has telescopic cylinder (35), telescopic cylinder (35) the expansion end with moving plate (34) rigid coupling.