Automobile crankshaft fixing and clamping device

Abstract

The utility model discloses an automobile crankshaft fixing and clamping device which comprises a top base and a side base, the top base is horizontally arranged in the transverse direction, a fixed supporting plate is fixedly installed on one side of the top face of the top base, and a movable supporting plate is placed on the other side of the top face of the top base. The rear portions of the top faces of the fixed supporting plate and the movable supporting plate are each provided with a shaft end pressing and fixing assembly used for fixedly clamping the shaft end of an automobile crankshaft. The device has the advantages that the distance between the fixed supporting plate and the movable supporting plate can be adjusted in the mode that a screw rod of the position adjusting assembly rotates to drive a nut base to transversely move, and then the distance between the fixed supporting plate and the movable supporting plate can adapt to automobile crankshafts with different axial lengths; the two shaft ends of the automobile crankshafts with different axial lengths are conveniently placed in the containing grooves in the two sides and then are limited and supported, the shaft end positions of the automobile crankshafts are fixedly clamped through the shaft end pressing and fixing assemblies, and fixing and clamping of the automobile crankshafts with different axial lengths are achieved.

Description

Technical Field

[0001] The utility model relates to the field of automobile crankshaft machining auxiliary components, in particular to an automobile crankshaft fixing and clamping device. Background Art

[0002] The automotive crankshaft is the most critical component in the engine. It receives force from the connecting rod, converts it into torque, and drives the engine's accessories. The crankshaft is subject to the combined effects of centrifugal force from the rotating mass, cyclically varying gas inertia, and reciprocating inertia, subjecting it to bending and torsional loads. Therefore, the crankshaft must possess sufficient strength and rigidity, a wear-resistant journal surface, uniform operation, and good balance.

[0003] The rough machining of automobile crankshafts widely uses CNC lathes, CNC internal milling machines, CNC turning and broaching machines and other equipment to perform CNC turning, internal milling, and turning-broaching on the main journal and connecting rod journal to effectively reduce the deformation of the crankshaft machining. Specifically, during the rough machining process of automobile crankshafts, the crankshaft needs to be clamped and fixed. However, since the axial length of the crankshaft has different dimensional specifications, the fixed clamping device of the same specification cannot complete the clamping and fixing of the crankshaft. It is necessary to design a variety of fixed clamping devices of different specifications, which increases the investment cost. Utility Model Content

[0004] The purpose of the present utility model is to provide a vehicle crankshaft fixing and clamping device in order to solve the above-mentioned problem. By rotating the screw of the position adjustment component to drive the nut seat to move horizontally, the distance between the fixed support plate and the movable support plate can be adjusted, and then the distance between the fixed support plate and the movable support plate can be adapted to vehicle crankshafts of different axial lengths, so that the two ends of vehicle crankshafts of different axial lengths can be conveniently placed in the storage slots at both sides and then supported by the limited support and the shaft end pressing component to fix and clamp the shaft end position of the vehicle crankshaft, thereby realizing the fixed clamping of vehicle crankshafts of different axial lengths. See the following for details.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The utility model provides an automobile crankshaft fixing and clamping device, comprising a top seat and a side seat, wherein the top seat is arranged horizontally in the transverse direction, a fixed support plate is fixedly installed on one side of the top surface of the top seat, and a movable support plate is placed on the other side of the top surface of the top seat, and the top surfaces of the fixed support plate and the movable support plate are both provided with a storage groove for positioning and placing the shaft end of the automobile crankshaft in the transverse direction, and the rear parts of the top surfaces of the fixed support plate and the movable support plate are both provided with a shaft end pressing assembly for fixing and clamping the shaft end of the automobile crankshaft;

[0007] The side seats are fixed vertically along the longitudinal direction on both sides of the bottom surface of the top seat, and a position adjustment component is installed between the side seats at both sides. The top of the position adjustment component is fixedly connected to the bottom surface of the movable support plate, so as to adjust the lateral position of the movable support plate through the position adjustment component, thereby adjusting the distance between the movable support plate and the fixed support plate;

[0008] The front part of the movable support plate is provided with an anti-movement component capable of locking the movable support plate so that it cannot move.

[0009] Preferably, the shaft end pressing components include an L-shaped mounting bracket and a cylinder body, the rear parts of the top surfaces of the fixed support plate and the movable support plate are fixedly mounted with the inverted L-shaped mounting bracket, and the horizontal parts of the top of the L-shaped mounting bracket are respectively suspended above the corresponding fixed support plate or the movable support plate, the top surfaces of the horizontal parts of the L-shaped mounting bracket are vertically fixed with the cylinder body, the push rods at the bottom of the cylinder body pass through the bottom surfaces of the horizontal parts of the corresponding L-shaped mounting brackets in a vertical sliding fit, and the bottom ends of the push rods are fixed with flat pressure plates through connecting sleeves, the bottom surfaces of the pressure plates are provided with pressure grooves in the transverse direction, and the pressure grooves are symmetrically distributed with the storage grooves on the corresponding sides.

[0010] Preferably, the pressing groove and the storage groove are both through grooves in the transverse direction, and both the pressing groove and the storage groove are V-shaped grooves.

[0011] Preferably, the inner surfaces of the pressing groove and the storage groove are both covered in parallel with a buffer lining fixed with a buffer material.

[0012] Preferably, the position adjustment assembly includes a drive motor, a bearing seat and a guide groove, the drive motor is fixed laterally on the outer side of the side seat at one side, and the bearing seat is fixedly installed on the inner side of the side seat at the other side, the motor shaft of the drive motor passes through the corresponding side seat in a transverse sliding fit and the end is coaxially fixed with a screw rod through a coupling, the other end of the screw rod is coaxially fixed to the inner ring of the rotary bearing built into the bearing seat, the outer periphery of the screw rod is engaged and inserted with a nut seat, and the outer top of the nut seat is vertically fixed with a guide seat, the top surface of the top seat is provided with the guide groove vertically in the transverse direction, the guide seat passes through the guide groove in a vertical sliding manner and the top end is fixedly connected to the bottom surface of the movable support plate.

[0013] Preferably, the guide groove is a waist-shaped groove arranged in the transverse direction, and both ends of the guide groove are respectively close to the two sides of the top seat.

[0014] Preferably, the position anti-movement assembly includes a wing plate and a clamping stud, the wing plate is fixedly extended horizontally in front of the movable support plate, and the wing plate is suspended above the top surface of the top seat, the wing plate is vertically inserted with the clamping stud in a threaded engagement manner, and the bottom end of the clamping stud is close to the top surface of the top seat, and the top end of the clamping stud is coaxially fixed with a handle for easy holding.

[0015] Preferably, an elastic pressing block with an outer diameter smaller than that of the clamping stud is coaxially fixed to the bottom end of the clamping stud.

[0016] Preferably, a connecting seat is horizontally fixed to the top surface of each side seat, and a plurality of connecting holes are vertically opened around each connecting seat.

[0017] The above-mentioned automobile crankshaft fixing and clamping device is adopted. Specifically, during the process of fixing and clamping the automobile crankshaft, the driving motor is energized by connecting to an external power supply cable. The driving motor drives the screw to rotate through the motor shaft. The screw drives the nut seat to move laterally during the rotation. During this process, the guide seat moves laterally along the guide groove, and the movable support plate is then laterally adjusted to adjust its position. The screw rotation of the position adjustment component drives the nut seat to move laterally, so that the distance between the fixed support plate and the movable support plate can be adjusted. Then, the distance between the fixed support plate and the movable support plate can be adapted to automobile crankshafts of different axial lengths, so that the two ends of automobile crankshafts of different axial lengths are placed in the storage slots at both sides respectively and are limited and supported, and the shaft end positions of the automobile crankshafts are fixed and clamped by the shaft end pressing component, thereby achieving fixed clamping of automobile crankshafts of different axial lengths. There is no need to design a variety of fixed clamping devices of different specifications, which reduces investment cost. Moreover, since the device is installed in front of the movable support plate, The position anti-movement component is provided, so that when the distance between the movable support plate and the fixed support plate is adjusted, the driving motor stops working, and then the elastic pressure block at the bottom is pressed against the top surface of the top seat by holding the hand wheel, so that the movable support plate can be locked and cannot move, thereby avoiding the situation that the movable support plate moves unexpectedly, thereby improving the fixed clamping stability of the automobile crankshaft shaft end, and specifically when the shaft end pressing component is used, the shaft end of the automobile crankshaft is limited and placed in the storage groove Afterwards, the cylinder body is ventilated by being connected to an external air supply pipeline, and the cylinder body drives the pressure plate to descend through the push rod. The cylinder body drives the pressure plate to descend so that the pressure groove can cooperate with the storage groove to fix and clamp the shaft end of the automobile crankshaft. The fixing and clamping method of the shaft end of the automobile crankshaft is simple and easy to implement, and since the storage groove and the pressure groove are both V-grooves, they can adapt to clamping and fixing the shaft ends of automobile crankshafts with different outer diameters, which is beneficial to improving the applicability of the shaft end pressing component.

[0018] The beneficial effects are as follows: 1. The utility model can adjust the distance between the fixed support plate and the movable support plate by rotating the screw of the position adjustment component to drive the nut seat to move horizontally, and then can make the distance between the fixed support plate and the movable support plate adapt to automobile crankshafts of different axial lengths, so that the two shaft ends of automobile crankshafts of different axial lengths can be conveniently placed in the storage grooves at both sides and then limited and supported, and the shaft end positions of the automobile crankshafts can be fixed and clamped by the shaft end pressing component, thereby achieving fixed clamping of automobile crankshafts of different axial lengths, without the need to design a variety of fixing and clamping devices of different specifications, thereby reducing investment costs;

[0019] 2. A position anti-movement component is installed in front of the movable support plate. When the distance between the movable support plate and the fixed support plate is adjusted, the movable support plate can be locked from moving by tightening the clamping stud to press the elastic pressure block at the bottom against the top surface of the top seat, thereby avoiding accidental movement of the movable support plate and improving the stability of the fixed clamping of the automobile crankshaft shaft end.

[0020] 3. By driving the pressure plate downward through the cylinder body, the pressure groove can cooperate with the placement groove to fix and clamp the shaft end of the automobile crankshaft. The fixing and clamping method of the automobile crankshaft shaft end is simple and easy to implement. At the same time, since the placement groove and the pressure groove are both V-shaped grooves, they can adapt to clamping and fixing automobile crankshaft shaft ends with different outer diameters, which is beneficial to improving the applicability of the shaft end pressing component. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is the overall axonometric diagram of the utility model Figure 1 ;

[0023] Figure 2 This is the overall axonometric diagram of the utility model Figure 2 ;

[0024] Figure 3 This utility model Figure 1 Cross-section diagram of Figure 1 ;

[0025] Figure 4 This utility model Figure 1 Cross-section diagram of Figure 2 ;

[0026] Figure 5 This utility model Figure 1 The front external view of

[0027] Figure 6 This utility model Figure 1 The left external view of

[0028] Figure 7 This utility model Figure 1 Top view of the exterior.

[0029] The following are the descriptions of the reference numerals:

[0030] 1. Movable support plate; 2. Fixed support plate; 3. Top seat; 4. Side seat; 401. Connecting seat; 402. Connecting hole; 5. Shaft end pressing assembly; 501. Cylinder body; 502. L-shaped mounting bracket; 503. Push rod; 504. Connecting sleeve; 505. Pressing plate; 506. Pressing groove; 507. Buffer lining; 6. Storage slot; 7. Position adjustment assembly; 701. Guide groove; 702. Drive motor; 703. Screw rod; 704. Guide seat; 705. Nut seat; 706. Bearing seat; 707. Motor shaft; 8. Position anti-movement assembly; 801. Handle; 802. Clamping stud; 803. Wing plate; 804. Elastic pressure block. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described 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 implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 7 As shown, the utility model provides a car crankshaft fixing and clamping device, including a top seat 3 and a side seat 4, the top seat 3 is horizontally arranged in the transverse direction, a fixed support plate 2 is fixedly installed on one side of the top surface of the top seat 3, and a movable support plate 1 is placed on the other side of the top surface of the top seat 3, and the top surfaces of the fixed support plate 2 and the movable support plate 1 are both provided with a storage groove 6 for positioning and placing the shaft end of the automobile crankshaft in the transverse direction, and the rear parts of the top surfaces of the fixed support plate 2 and the movable support plate 1 are both provided with a shaft end pressing component 5 for fixing and clamping the shaft end of the automobile crankshaft. Specifically, the shaft end pressing component 5 includes an L-shaped mounting bracket 502 and a cylinder body 501, and the rear parts of the top surfaces of the fixed support plate 2 and the movable support plate 1 are both fixedly installed with an inverted L-shaped mounting bracket 502, and the horizontal part of the top of the L-shaped mounting bracket 502 The L-shaped mounting bracket 502 is suspended above the corresponding fixed support plate 2 or the movable support plate 1 respectively. The top surface of the horizontal part of the L-shaped mounting bracket 502 is vertically fixed with a cylinder body 501. The push rod 503 at the bottom of the cylinder body 501 passes through the bottom surface of the horizontal part of the corresponding L-shaped mounting bracket 502 in a vertical sliding fit, and the bottom end of the push rod 503 is fixed with a flat pressing plate 505 through a connecting sleeve 504. The bottom surface of the pressing plate 505 is provided with a pressing groove 506 in the horizontal direction, and the pressing groove 506 is symmetrically distributed with the storage groove 6 on the corresponding side. The purpose of this arrangement is to enable the pressing groove 506 to cooperate with the storage groove 6 to fix and clamp the shaft end of the automobile crankshaft by driving the pressing plate 505 to descend by the cylinder body 501, and the fixing and clamping method of the shaft end of the automobile crankshaft is simple and easy to implement.

[0033] See also Figures 1-4As shown, side seats 4 are fixed vertically on both sides of the bottom surface of the top seat 3 along the longitudinal direction, and a position adjustment component 7 is installed between the side seats 4 on both sides. The top of the position adjustment component 7 is fixedly connected to the bottom surface of the movable support plate 1, so as to adjust the lateral position of the movable support plate 1 through the position adjustment component 7, and then adjust the distance between the movable support plate 1 and the fixed support plate 2. Specifically, the position adjustment component 7 includes a drive motor 702, a bearing seat 706 and a guide groove 701. The outer side of the side seat 4 on one side is fixed with a drive motor 702 along the transverse direction, and the inner side of the side seat 4 on the other side is fixed with a bearing seat 706. The motor shaft 707 of the drive motor 702 passes through the corresponding side seat 4 in a transverse sliding fit and the end is coaxially fixed with a screw rod 703 through a coupling. The other end of the screw rod 703 is built into the bearing seat 706. The inner ring of the rotary bearing is coaxially fixed, and the outer periphery of the screw rod 703 is meshed with a nut seat 705, and the outer top of the nut seat 705 is vertically fixed with a guide seat 704. The top surface of the top seat 3 is provided with a guide groove 701 vertically along the horizontal direction. The guide seat 704 passes through the guide groove 701 in a vertical sliding manner and the top end is fixed to the bottom surface of the movable support plate 1. The purpose of this arrangement is to adjust the distance between the fixed support plate 2 and the movable support plate 1 by rotating the screw rod 703 of the position adjustment component 7 to drive the nut seat 705 to move horizontally, and then the distance between the fixed support plate 2 and the movable support plate 1 can be adapted to automobile crankshafts of different axial lengths, so that the two ends of automobile crankshafts of different axial lengths are placed in the storage slots 6 on both sides respectively, and then are limited and supported, and the shaft end position of the automobile crankshaft is fixed and clamped by the shaft end pressing component 5.

[0034] See also Figures 1-4 As shown, the front portion of the movable support plate 1 is installed with a position anti-movement component 8 that can lock the movable support plate 1 from moving. Specifically, the position anti-movement component 8 includes a wing plate 803 and a clamping stud 802. The front of the movable support plate 1 is horizontally extended and fixed with a wing plate 803, and the wing plate 803 is suspended above the top surface of the top seat 3. The wing plate 803 is vertically interspersed with the clamping stud 802 in a threaded engagement manner, and the bottom end of the clamping stud 802 is close to the top surface of the top seat 3. The top end of the clamping stud 802 is coaxially fixed with a handle 801 for easy holding. The reason for this arrangement is that by holding the handwheel and twisting the clamping stud 802, the elastic pressure block 804 at the bottom is pressed against the top surface of the top seat 3, which can lock the movable support plate 1 from moving, thereby avoiding the situation where the movable support plate 1 moves accidentally.

[0035] See also Figures 1-4As shown, the shaft end pressing assembly 5, the position adjustment assembly 7, and the position anti-movement assembly 8 have been optimized as follows. Specifically, in the shaft end pressing assembly 5, the pressing groove 506 and the storage groove 6 are both through grooves in the transverse direction, and the pressing groove 506 and the storage groove 6 are both V-shaped grooves. With this arrangement, firstly, the storage groove 6 and the pressing groove 506 have good automatic alignment effects, and at the same time, they are suitable for clamping and fixing automobile crankshaft ends of different outer diameters. Optionally, the inner surfaces of the pressing groove 506 and the storage groove 6 are both covered with a buffer liner 507 fixed with a buffer material in parallel. This arrangement prevents the pressing plate 505 from damaging the shaft end of the automobile crankshaft by elastically deforming the buffer liner 507.

[0036] Specifically, in the position adjustment assembly 7, the guide groove 701 is a waist-shaped groove arranged horizontally, and the two ends of the guide groove 701 are respectively close to the two sides of the top seat 3. This allows the guide groove 701 to have a sufficiently wide adjustment range in the horizontal direction, facilitating the adjustment of the movable pressure plate 505 and the fixed pressure plate 505 to a variety of suitable spacings. Specifically, in the position anti-movement assembly 8, an elastic pressure block 804 with an outer diameter smaller than that of the clamping stud 802 is coaxially fixed to the bottom end of the clamping stud 802. This prevents damage to the top surface of the top seat 3 by deforming the elastic pressure block 804 and pressing it against it, while also improving the stability of the position locking limit of the movable pressure plate 505. Specifically for the side seat 4, a connecting seat 401 is horizontally fixed on the top surface of the side seat 4, and a plurality of connecting holes 402 are vertically opened around the connecting seat 401. This arrangement makes it easy to firmly fix the side seat 4 in the installation and use position by installing bolts to the installation position through the connecting holes 402 of the connecting seat 401.

[0037] With the above structure, specifically in the process of fixing and clamping the crankshaft of the automobile, the driving motor 702 is energized by connecting it to the external power supply cable, and the driving motor 702 drives the screw rod 703 to rotate through the motor shaft 707. The screw rod 703 drives the nut seat 705 to move laterally during the rotation. During this process, the guide seat 704 moves laterally along the guide groove 701, and the movable support plate 1 is then moved laterally to adjust its position. The fixed support plate 2 and the movable support plate 1 can be adjusted by rotating the screw rod 703 of the position adjustment component 7 to drive the nut seat 705 to move laterally. The distance between the movable support plates 1 can be adjusted, and then the distance between the fixed support plate 2 and the movable support plate 1 can be adapted to the automobile crankshafts of different axial lengths, so that the two ends of the automobile crankshafts of different axial lengths can be placed in the storage grooves 6 at both sides and then supported by the limited support and the shaft end pressing component 5 to fix the position of the automobile crankshaft, thereby achieving the fixed clamping of automobile crankshafts of different axial lengths. There is no need to design a variety of fixed clamping devices of different specifications, which reduces the investment cost. The anti-movement component 8 is set, so that when the distance between the movable support plate 1 and the fixed support plate 2 is adjusted, the driving motor 702 stops working, and then the hand wheel is held to twist the clamping stud 802 so that the elastic pressure block 804 at the bottom is pressed against the top surface of the top seat 3, so that the movable support plate 1 cannot move, thereby avoiding the situation where the movable support plate 1 moves unexpectedly, thereby helping to improve the fixed clamping stability of the automobile crankshaft shaft end, and specifically when using the shaft end pressing component 5, after the shaft end limit of the automobile crankshaft is placed in the storage groove 6, the cylinder body 501 is ventilated by being connected to an external air supply line. The cylinder body 501 drives the pressure plate 505 to descend through the push rod 503. The cylinder body 501 drives the pressure plate 505 to descend so that the pressure groove 506 can cooperate with the storage groove 6 to fix and clamp the shaft end of the automobile crankshaft. The fixing and clamping method of the shaft end of the automobile crankshaft is simple and easy to implement. Moreover, since the storage groove and the pressure groove 506 are both V-grooves, they can adapt to clamping and fixing the shaft ends of automobile crankshafts with different outer diameters, which is beneficial to improving the applicability of the shaft end pressing component 5.

[0038] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A vehicle crankshaft fixing and clamping device, comprising a top seat (3) and a side seat (4), characterized in that: The top seat (3) is arranged horizontally in the transverse direction, a fixed support plate (2) is fixedly installed on one side of the top surface of the top seat (3), and a movable support plate (1) is placed on the other side of the top surface of the top seat (3), and a storage groove (6) for positioning and placing the end of the automobile crankshaft is opened in the transverse direction on the top surface of the fixed support plate (2) and the movable support plate (1), and an end clamping assembly (5) for fixing and clamping the end of the automobile crankshaft is installed on the rear part of the top surface of the fixed support plate (2) and the movable support plate (1); The side seats (4) are fixed vertically along the longitudinal direction on both sides of the bottom surface of the top seat (3), and a position adjustment component (7) is installed between the side seats (4) at both sides. The top of the position adjustment component (7) is fixedly connected to the bottom surface of the movable support plate (1) to adjust the lateral position of the movable support plate (1) through the position adjustment component (7), thereby adjusting the distance between the movable support plate (1) and the fixed support plate (2); The front portion of the movable support plate (1) is provided with an anti-movement component (8) capable of locking the movable support plate (1) so that it cannot move.

2. The automobile crankshaft fixing and clamping device according to claim 1, characterized in that: The shaft end pressing assembly (5) includes an L-shaped mounting frame (502) and a cylinder body (501), and the rear portion of the top surface of the fixed support plate (2) and the movable support plate (1) are fixedly mounted with the inverted L-shaped mounting frame (502), and the horizontal portion of the top of the L-shaped mounting frame (502) is suspended above the corresponding fixed support plate (2) or the movable support plate (1), and the top surface of the horizontal portion of the L-shaped mounting frame (502) is vertically fixed with the The cylinder body (501) comprises a push rod (503) at the bottom of the cylinder body (501) which passes through the bottom surface of the horizontal portion of the corresponding L-shaped mounting frame (502) in a vertical sliding fit manner, and the bottom end of the push rod (503) is fixed with a flat pressing plate (505) through a connecting sleeve (504), and the bottom surface of the pressing plate (505) is provided with a pressing groove (506) in the horizontal direction, and the pressing groove (506) is symmetrically distributed with the storage groove (6) on the corresponding side.

3. The automobile crankshaft fixing and clamping device according to claim 2, characterized in that: The pressing groove (506) and the storage groove (6) are both through grooves in the transverse direction, and the pressing groove (506) and the storage groove (6) are both V-shaped grooves.

4. The automobile crankshaft fixing and clamping device according to claim 3, characterized in that: The inner surfaces of the pressing groove (506) and the storage groove (6) are both covered in parallel with a buffer lining (507) fixed with a buffer material.

5. The automobile crankshaft fixing and clamping device according to any one of claims 1 to 4, characterized in that: The position adjustment assembly (7) includes a drive motor (702), a bearing seat (706) and a guide groove (701), wherein the drive motor (702) is fixed laterally on the outer side of the side seat (4) at one side, and the bearing seat (706) is fixedly installed on the inner side of the side seat (4) at the other side, and the motor shaft (707) of the drive motor (702) passes through the corresponding side seat (4) in a transverse sliding fit manner and a screw rod (703) is coaxially fixed at the end thereof through a coupling. The other end of the screw rod (703) is coaxially fixed to the inner ring of the rotary bearing built into the bearing seat (706), the outer periphery of the screw rod (703) is meshed with a nut seat (705), and a guide seat (704) is vertically fixed to the top of the outer periphery of the nut seat (705), and the top surface of the top seat (3) is provided with the guide groove (701) vertically in the horizontal direction, and the guide seat (704) passes through the guide groove (701) in a vertical sliding manner and the top end is fixed to the bottom surface of the movable support plate (1).

6. The automobile crankshaft fixing and clamping device according to claim 5, characterized in that: The guide groove (701) is a waist-shaped groove arranged in the transverse direction, and both ends of the guide groove (701) are respectively close to the two sides of the top seat (3).

7. The automobile crankshaft fixing and clamping device according to claim 6, characterized in that: The position anti-movement assembly (8) includes a wing plate (803) and a clamping stud (802), the wing plate (803) is fixed to the front of the movable support plate (1) horizontally, and the wing plate (803) is suspended above the top surface of the top seat (3), the wing plate (803) is vertically inserted with the clamping stud (802) in a threaded engagement manner, and the bottom end of the clamping stud (802) is close to the top surface of the top seat (3), and the top end of the clamping stud (802) is coaxially fixed with a handle (801) for easy holding.

8. The automobile crankshaft fixing and clamping device according to claim 7, characterized in that: An elastic pressing block (804) having an outer diameter smaller than that of the pressing stud (802) is coaxially fixed to the bottom end of the pressing stud (802).

9. The automobile crankshaft fixing and clamping device according to claim 6, 7 or 8, characterized in that: A connecting seat (401) is horizontally fixed on the top surface of each side seat (4), and a plurality of connecting holes (402) are vertically opened around each connecting seat (401).

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