Crankshaft positioning clamp

Abstract

The invention relates to the field of positioning fixture equipment, and discloses a crankshaft positioning fixture. A fixed plate is welded to the upper surface of one side of a supporting plate, a movable plate is movably connected to the upper surface of the side, away from the fixed plate, of the supporting plate, a clamping main body is welded to the upper surface of the fixed plate, a clamping main body is also welded to the upper surface of the movable plate, and a deformable clamping and fixing block is movably connected to the outer surface of the clamping main body; an adjusting rod is fixedly connected to the outer surface of the deformable clamping and fixing block, a threaded rod is arranged on the inner surface of the end, away from the deformable clamping and fixing block, of the adjusting rod, a fixing block is welded to the outer surface of the deformable clamping and fixing block, the crankshaft is inserted into the deformable clamping and fixing block, and a rotatable threaded ring is arranged at one end of the adjusting rod; the threaded rod stretches out and draws back corresponding to the threaded groove, the length of the crankshaft is fixed, the crankshaft is placed above the main clamping block, then the fixed block is placed above the main clamping block, and by rotating the rocker and the movable rack, the main clamping block gets close to the middle to clamp the fixed block.

Description

Technical Field

[0001] The invention belongs to the technical field of positioning fixture equipment, in particular to a positioning fixture for a crankshaft. Background Art

[0002] The crankshaft is the most important part of the engine. It bears the force from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine. The crankshaft is subjected to the combined effects of the centrifugal force of the rotating mass, the periodically changing gas inertia force and the reciprocating inertia force, which makes the crankshaft subject to bending and torsional loads.

[0003] The crankshaft positioning fixture is a tool specially used for the processing and assembly of automobile engine crankshafts. It ensures the stability and accuracy of the crankshaft during processing or assembly through precise positioning and clamping, thereby improving processing accuracy and production efficiency. This fixture is usually adjustable and can adapt to crankshafts of different specifications. It has a strong structure and can withstand various forces and impacts during processing. The crankshaft positioning fixture plays a vital role in the automobile manufacturing and maintenance industry, providing effective protection for ensuring engine performance and reliability.

[0004] However, crankshaft processing and assembly require a series of tests before use to ensure its performance and reliability. The existing test fixture is clamped for measurement and then needs to be disassembled for assembly. In certain scenarios, the assembly location has a small space and limited movable positions, making assembly impossible. Summary of the invention

[0005] The purpose of the present invention is to provide a positioning fixture for a crankshaft in order to solve the above-mentioned problem.

[0006] The technical solution adopted by the present invention is as follows: a positioning fixture for a crankshaft comprises a support plate, a fixed plate is welded on the upper surface of one side of the support plate, a movable plate is movably connected to the upper surface of the support plate away from the fixed plate, a clamping body is welded on the upper surface of the fixed plate, a clamping body is also welded on the upper surface of the movable plate, a deformable clamping block is movably connected to the outer surface of the clamping body, a connecting strip is movably connected to the outer surface of the deformable clamping blocks, a connecting hinge is staggered and movably connected to the outer surface of the deformable clamping blocks and the connecting strip, an adjusting rod is fixedly connected to the outer surface of the deformable clamping block, a threaded rod is provided on the inner surface of one end of the adjusting rod away from the deformable clamping block, and a fixed block is welded to the outer surface of the deformable clamping block.

[0007] By adopting the above technical scheme, the crankshaft is inserted into the deformable clamping block, and a rotatable threaded ring is set at one end of the adjusting rod. The threaded rod is extended and retracted corresponding to the threaded groove to complete the length fixation of the crankshaft. It is placed above the main clamping block, and the fixed block is placed above the main clamping block. By rotating the rocker, the movable rack and the main clamping block are moved closer to the middle to clamp the fixed block. After the equipment completes the clamping, the clamping adjustment amount is slightly reduced, and the deformable clamping block can be pulled out. The deformable clamping block corresponds to the position to be installed. The connecting strip facilitates the left and right angle adjustment of the two adjacent layers. The function of the connecting hinge facilitates the front and rear activity adjustment of the two adjacent layers. Under the overall action of the staggered threaded rods and the fixed block, the stability of the length and the stable displacement of the crankshaft are guaranteed. By applying force outward at the fixed block, it is pushed out and directly inserted into the installation position. After the corresponding detection is completed, the placement and installation of the crankshaft is completed directly.

[0008] In a preferred embodiment, adjustment baffles are welded to upper surfaces of both sides of the support plate corresponding to the movable plate, and the outer surfaces of the adjustment baffles are movably connected to limit clamping strips.

[0009] By adopting the above technical solution, the limit card strip is taken out, the movable plate can be displaced at the support plate to adjust the support length, and then the limit card strip is inserted into the corresponding protrusion of the movable plate to complete the fixation, and the baffle is adjusted to ensure that the movable plate does not fall off.

[0010] In a preferred embodiment, a rocker is movably connected to the inner surface of the clamping body, a movable rack is movably connected to the inner surface of the clamping body corresponding to the rocker, and a main clamping block is welded to the outer surface of the movable rack away from the rocker.

[0011] By adopting the above technical solution, the rotation of the rocker drives the movable rack and the main clamping block to move inward or outward at the same time, which is convenient for clamping the crankshaft. The lower ends of the main clamping blocks are inserted into support rods corresponding to each other, which is convenient for placing and fixing the crankshaft or the fixed block.

[0012] In a preferred embodiment, the upper surface of the support plate is movably connected to a movable base, the inner surface of the movable base is movably connected to a supporting oblique rod, and the supporting oblique rod is movably connected to a connecting piece away from the outer surface of the movable base.

[0013] By adopting the above technical solution, the connection between the movable base, the supporting diagonal rod and the connecting piece facilitates the support of the support table. The connecting piece has built-in deformable metal, and the corresponding supporting diagonal rod support has a certain elastic space to avoid the crankshaft being subjected to large deformation force during the clamping process, causing irreversible bending.

[0014] In a preferred embodiment, an auxiliary cross bar is provided on the outer surface of the connecting piece, and the auxiliary cross bar passes through the outer surface of the movable plate and is movably connected with a nut.

[0015] By adopting the above technical solution, the rotation of the nut at the auxiliary cross bar extrudes the distance between the connecting parts, and then adjusts the height of the support platform with the cooperation of the movable base and the supporting diagonal rod to complete the adjustment of the support.

[0016] In a preferred embodiment, a support platform is provided on the outer surface above the supporting diagonal rod corresponding to the movable base, a support window is provided on the outer surface of the fixed plate, and a support window is also provided on the outer surface at the corresponding position of the movable plate.

[0017] By adopting the above technical solution, the support platform is raised and lowered to contact the crankshaft to complete the support of the middle crankshaft position. The purpose of the support window is to provide a position for inserting auxiliary support plates, adjustment plates or inserting supports at both ends of the crankshaft.

[0018] In a preferred embodiment, an auxiliary support plate is movably connected to the inner surface of the support window, and an adjustment plate is movably connected to the inner surface of the auxiliary support plate.

[0019] By adopting the above technical solution, support windows are inserted into both ends of the auxiliary support plate to assist in supporting, and the adjustment plate prevents the lifting and lowering of the support platform from being blocked and unable to complete the corresponding function.

[0020] In a preferred embodiment, a side fixing frame is welded to the side surface of the support plate, an adjusting support rod is movably connected to the inner surface of the side fixing frame, and a telescopic joint is fixedly connected to the outer surface of the upper end of the adjusting support rod.

[0021] By adopting the above technical solution, the adjusting support rod is fixed by screws after the side fixed frame is adjusted, the fixed end of the telescopic joint is a sleeve, and the movable end is fixed with the raised block after the built-in spring to form the movable end in the sleeve, and the rotation of the crankshaft is detected, and the surface of the shaft contacts the movable end.

[0022] In a preferred embodiment, a fixed rail is fixedly connected to the upper surface of the fixed end of the telescopic joint, a slider is movably connected to the upper surface of the telescopic joint, a connecting rod is movably inserted into the upper surface of the movable end of the telescopic joint, and a pointer is movably inserted into the upper surface of the telescopic joint next to the connecting rod.

[0023] By adopting the above technical solution, the connecting rod can be inserted to detect whether the displacement of the same groove is uniform. After the insertion pointer corresponds to the groove and contacts the expansion joint, the pointer displacement corresponds to the displacement of the slider to measure the radial runout of the crankshaft. The fixed rail ensures that the slider always moves inside to prevent it from falling.

[0024] In a preferred embodiment, a scale is fixedly connected to the side surface of the support plate, and a base is fixedly connected to the lower surface of the support plate.

[0025] By adopting the above technical solution, the scale helps to measure the crankshaft length, and the base further ensures the stability of the equipment.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] 1. After the equipment completes the clamping, it can perform simple measurements. By pulling out the deformable clamping block, the deformable clamping block corresponds to the position to be installed. By applying force outwards at the fixed block, the equipment can slightly reduce the clamping adjustment amount and then pull out the deformable clamping block. The deformable clamping block corresponds to the position to be installed. The connecting strip facilitates the left and right angle adjustment of the two adjacent layers. The function of the connecting hinge facilitates the front and back activity adjustment of the two adjacent layers. Under the overall action of the staggered threaded rods and the fixed block, the length stability and the stable displacement of the crankshaft are guaranteed. By applying force outwards at the fixed block, it is pushed out and directly snapped into the installation position. After the corresponding detection is completed, the placement and installation of the crankshaft is completed directly;

[0028] 2. The whole equipment and its components provide adjustment structures for clamping crankshafts of different sizes, making it convenient for users to clamp and fix crankshafts of different lengths and widths;

[0029] 3. The fixed end of the expansion joint is a sleeve, which is fixed with a raised block after a built-in spring to form a movable end in the sleeve. The rotation detection of the crankshaft is that the surface of the shaft contacts the movable end. The insertion of the connecting rod can detect whether the displacement of the same groove is uniform. After the insertion pointer contacts the expansion joint in the corresponding groove, the displacement of the pointer corresponds to the displacement against the slider to measure the radial runout of the crankshaft.

[0030] 4. The equipment can be fixed by inserting the crankshaft into the deformable clamping block, or by inserting the support window for fixed measurement. Similarly, the auxiliary support plate and the adjustment plate can assist in fixation. The side fixed frame, the adjustment support rod, and the telescopic joint can be measured as a whole, and it is convenient to support them on the side, which increases the overall utilization efficiency of the parts and also provides multiple support points to ensure the positioning of the crankshaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a front view of the overall appearance of the device of the present invention;

[0032] Figure 2 It is a back view of the overall appearance of the device in the present invention;

[0033] Figure 3 This is a diagram showing the overall appearance of the device in the present invention;

[0034] Figure 4 It is a schematic diagram of the main clamping structure of the device in the present invention;

[0035] Figure 5 This is a schematic diagram of the auxiliary support structure of the equipment in the present invention;

[0036] Figure 6This is a schematic diagram of the interior of the clamping body of the device in the present invention;

[0037] Figure 7 It is a schematic diagram of the clamping structure of the device in the present invention.

[0038] Markings in the figure: 1. Support plate; 2. Fixed plate; 3. Movable plate; 4. Clamping body; 5. Deformable clamping block; 6. Connecting strip; 7. Connecting hinge; 8. Adjusting rod; 9. Threaded rod; 10. Fixed block; 11. Adjusting baffle; 12. Limiting card strip; 13. Rocker; 14. Movable rack; 15. Main clamping block; 16. Movable base; 17. Support diagonal rod; 18. Connecting piece; 19. Auxiliary cross bar; 20. Nut; 21. Support table; 22. Support window; 23. Auxiliary support plate; 24. Adjusting plate; 25. Side fixing frame; 26. Adjusting support rod; 27. Telescopic joint; 28. Fixed rail; 29. ​​Slider; 30. Connecting rod; 31. Pointer; 32. Scale; 33. Base. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Reference Figure 1-7 ,

[0041] Example:

[0042] A positioning fixture for a crankshaft comprises a support plate 1, a fixed plate 2 is welded to the upper surface of one side of the support plate 1, a movable plate 3 is movably connected to the upper surface of the support plate 1 away from the fixed plate 2, a clamping body 4 is welded to the upper surface of the fixed plate 2, a clamping body 4 is also welded to the upper surface of the movable plate 3, a deformable clamping block 5 is movably connected to the outer surface of the clamping body 4, a connecting strip 6 is movably connected to the outer surface between the deformable clamping blocks 5, a connecting hinge 7 is staggered and movably connected to the outer surface of the deformable clamping blocks 5 and the connecting strip 6, an adjusting rod 8 is fixedly connected to the outer surface of the deformable clamping block 5, a threaded rod 9 is provided on the inner surface of the end of the adjusting rod 8 away from the deformable clamping block 5, and a fixed block 10 is welded to the outer surface of the deformable clamping block 5.

[0043] The crankshaft is inserted into the deformable clamping block 5, and a rotatable threaded ring is set at one end of the adjusting rod 8. The threaded rod 9 is extended and retracted corresponding to the threaded groove to complete the length fixing of the crankshaft. It is placed above the main clamping block 15, and the fixed block 10 is placed above the main clamping block 15. By rotating the rocker 13, the movable rack 14 and the main clamping block 15 are moved closer to the middle to clamp the fixed block 10. After the equipment completes the clamping, the clamping adjustment amount is slightly reduced, and the deformable clamping block 5 can be pulled out. The deformable clamping block 5 corresponds to the position to be installed, the connecting strip 6 facilitates the left and right angle adjustment of the two adjacent layers, and the function of the connecting hinge 7 facilitates the front and rear activity adjustment of the two adjacent layers. Under the overall action of the staggered threaded rods 9 and the fixed block 10, the stability of the length and the stable displacement of the crankshaft are guaranteed. By applying force outward at the fixed block 10, it is pushed out and directly inserted into the installation position. After the corresponding detection is completed, the placement and installation of the crankshaft is directly completed.

[0044] Adjustment baffles 11 are welded on the upper surfaces of both sides of the support plate 1 corresponding to the movable plate 3 , and the outer surfaces of the adjustment baffles 11 are movably connected with limit clamping strips 12 .

[0045] By taking out the limiting card strip 12, the movable plate 3 can be displaced at the support plate 1 to adjust the support length, and then the limiting card strip 12 is inserted into the corresponding protrusion of the movable plate 3 to complete the fixation, and the baffle 11 is adjusted to ensure that the movable plate 3 does not fall off.

[0046] A rocker 13 is movably connected to the inner surface of the clamping body 4 , and a movable rack 14 is movably connected to the inner surface of the clamping body 4 corresponding to the rocker 13 . A main clamping block 15 is welded to the outer surface of the movable rack 14 away from the rocker 13 .

[0047] The rotation of the rocker 13 drives the movable rack 14 and the main clamping block 15 to move inward or outward at the same time, which is convenient for clamping the crankshaft. The lower ends of the main clamping blocks 15 are inserted into supporting rods corresponding to each other, which is convenient for placing and fixing the crankshaft or the fixed block 10.

[0048] The upper surface of the support plate 1 is movably connected to a movable base 16 , the inner surface of the movable base 16 is movably connected to a supporting inclined rod 17 , and the outer surface of the supporting inclined rod 17 away from the movable base 16 is movably connected to a connecting piece 18 .

[0049] The connection between the movable base 16, the supporting diagonal rod 17 and the connecting piece 18 facilitates the support of the support platform 21. The connecting piece 18 has a built-in deformable metal, and the corresponding supporting diagonal rod 17 supports a certain elastic space to prevent the crankshaft from being subjected to large deformation force during the clamping process, causing irreversible bending.

[0050] An auxiliary cross bar 19 is disposed on the outer surface of the connecting member 18 , and the auxiliary cross bar 19 passes through the outer surface of the movable plate 3 and is movably connected with a nut 20 .

[0051] The rotation of the nut 20 at the auxiliary cross bar 19 extrudes the distance between the connecting pieces 18, and then with the cooperation of the movable base 16 and the supporting diagonal rod 17, the height of the supporting platform 21 is adjusted to complete the adjustment of the support.

[0052] A support platform 21 is provided on the outer surface of the supporting inclined rod 17 corresponding to the upper side of the movable base 16 , a support window 22 is provided on the outer surface of the fixed plate 2 , and a support window 22 is also provided on the outer surface of the corresponding position of the movable plate 3 .

[0053] The support platform 21 is raised and lowered to contact the crankshaft to support the middle crankshaft position. The support window 22 is used to provide a position for inserting the auxiliary support plate 23 and the adjustment plate 24 or inserting the supports at both ends of the crankshaft.

[0054] An auxiliary support plate 23 is movably connected to the inner surface of the support window 22 , and an adjustment plate 24 is movably connected to the inner surface of the auxiliary support plate 23 .

[0055] Both ends of the auxiliary support plate 23 are inserted into the support window 22 to assist in supporting, and the adjustment plate 24 prevents the lifting and lowering of the support platform 21 from being blocked and unable to complete the corresponding function.

[0056] A side fixing frame 25 is welded to the side surface of the support plate 1 , an adjusting support rod 26 is movably connected to the inner surface of the side fixing frame 25 , and a telescopic joint 27 is fixedly connected to the outer surface of the upper end of the adjusting support rod 26 .

[0057] The adjusting support rod 26 is fixed by screws after the side fixing frame 25 is adjusted. The fixed end of the telescopic joint 27 is a sleeve, and the movable end is fixed with the raised block after the built-in spring to form the movable end in the sleeve. The rotation detection of the crankshaft is that the surface of the shaft contacts the movable end.

[0058] A fixed rail 28 is fixedly connected to the upper surface of the fixed end of the telescopic joint 27, a slider 29 is movably connected to the upper surface of the telescopic joint 27, a connecting rod 30 is movably inserted into the upper surface of the movable end of the telescopic joint 27, and a pointer 31 is movably inserted into the upper surface of the telescopic joint 27 next to the connecting rod 30.

[0059] Inserting the connecting rod 30 can detect whether the displacement of the same groove is uniform. After the corresponding groove of the inserted pointer 31 contacts the telescopic joint 27, the displacement of the pointer 31 corresponds to the displacement of the slider 29 to measure the radial runout of the crankshaft. The fixed rail 28 ensures that the movement of the slider 29 is always inside to prevent it from falling.

[0060] A scale 32 is fixedly connected to the side surface of the support plate 1 , and a base 33 is fixedly connected to the lower surface of the support plate 1 .

[0061] The scale 32 assists in measuring the length of the crankshaft, and the base 33 further ensures the stability of the equipment.

[0062] The implementation principle of a crankshaft positioning fixture embodiment of the present invention is:

[0063] The crankshaft is inserted into the deformable clamping block 5, and a rotatable threaded ring is set at one end of the adjusting rod 8. The threaded rod 9 is extended and retracted corresponding to the threaded groove to complete the length fixing of the crankshaft. It is placed above the main clamping block 15, and the fixed block 10 is placed above the main clamping block 15. By rotating the rocker 13, the movable rack 14 and the main clamping block 15 are moved closer to the middle to clamp the fixed block 10, and the limit card strip 12 is removed upward. The movable plate 3 is movable to adjust the length of the support, and then the limit card strip 12 is inserted into the corresponding convex block of the movable plate 3 to complete the fixation. The rotation of the nut 20 at the auxiliary cross bar 19 squeezes the distance between the connecting piece 18, and then with the cooperation of the movable base 16 and the supporting diagonal rod 17, the height of the support platform 21 is adjusted to complete the adjustment of the support. The connecting piece 18 has a built-in deformable metal, and the corresponding supporting diagonal rod 17 supports a certain elastic space to avoid the crankshaft from being subjected to large deformation force during the clamping process. The bending is irreversible, and the adjusting support rod 26 is fixed by screws after the side fixing frame 25 adjusts its position. The fixed end of the telescopic joint 27 is A sleeve, after having a built-in spring, is fixed with the raised block to form a movable end in the sleeve, the rotation detection of the crankshaft, the surface of the shaft contacts the movable end, and the insertion of the connecting rod 30 can detect whether the displacement of the same groove is uniform. After the corresponding groove of the inserted pointer 31 contacts the telescopic joint 27, the displacement of the pointer 31 corresponds to the displacement against the slider 29 to measure the radial runout of the crankshaft. After the equipment completes the clamping, the deformable clamping block 5 is pulled out, and the deformable clamping block 5 corresponds to the position to be installed. The fixed block 10 is used to apply force outward. After the equipment completes the clamping, the clamping adjustment amount is slightly reduced, and the deformable clamping block 5 can be pulled out. The deformable clamping block 5 corresponds to the position to be installed. The connecting strip 6 facilitates the left and right angle adjustment of the adjacent two layers. The function of the connecting hinge 7 facilitates the front and rear activity adjustment of the adjacent two layers. Under the overall action of the staggered threaded rod 9 and the fixed block 10, the stability of the length and the stable displacement of the crankshaft are guaranteed. The fixed block 10 is used to apply force outward to push it out and directly snap it into the installation position. After the corresponding detection is completed, the placement and installation of the crankshaft is directly completed.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A crankshaft positioning fixture, comprising a support plate (1), characterized in that: A fixed plate (2) is welded to the upper surface of one side of the support plate (1); a movable plate (3) is movably connected to the upper surface of the support plate (1) away from the fixed plate (2); a clamping body (4) is welded to the upper surface of the fixed plate (2); a clamping body (4) is also welded to the upper surface of the movable plate (3); a deformable clamping block (5) is movably connected to the outer surface of the clamping body (4); a connecting strip (6) is movably connected to the outer surface of the deformable clamping blocks (5); a connecting hinge (7) is staggered and movably connected to the outer surface of the deformable clamping blocks (5) and the connecting strip (6); an adjusting rod (8) is fixedly connected to the outer surface of the deformable clamping block (5); a threaded rod (9) is provided on the inner surface of the end of the adjusting rod (8) away from the deformable clamping block (5); and a fixed block (10) is welded to the outer surface of the deformable clamping block (5).

2. A crankshaft positioning fixture as claimed in claim 1, characterized in that: Adjustment baffles (11) are welded to the upper surfaces of both sides of the support plate (1) corresponding to the movable plate (3), and the outer surface of the adjustment baffle (11) is movably connected to a limit clamping strip (12).

3. A crankshaft positioning fixture as claimed in claim 1, characterized in that: The inner surface of the clamping body (4) is movably connected to a rocker (13), and the inner surface of the clamping body (4) corresponding to the rocker (13) is movably connected to a movable rack (14), and the outer surface of the movable rack (14) away from the rocker (13) is welded with a main clamping block (15).

4. A crankshaft positioning fixture as claimed in claim 1, characterized in that: The upper surface of the support plate (1) is movably connected to a movable base (16), the inner surface of the movable base (16) is movably connected to a supporting inclined rod (17), and the outer surface of the supporting inclined rod (17) away from the movable base (16) is movably connected to a connecting piece (18).

5. A crankshaft positioning fixture as claimed in claim 4, characterized in that: An auxiliary cross bar (19) is provided on the outer surface of the connecting piece (18), and the auxiliary cross bar (19) penetrates the outer surface of the movable plate (3) and is movably connected to a nut (20).

6. A crankshaft positioning fixture as claimed in claim 4, characterized in that: The supporting inclined rod (17) is provided with a supporting platform (21) on the outer surface above the corresponding movable base (16), the fixed plate (2) is provided with a supporting window (22) on the outer surface, and the movable plate (3) is also provided with a supporting window (22) on the outer surface at the corresponding position.

7. A crankshaft positioning fixture as claimed in claim 6, characterized in that: The inner surface of the support window (22) is movably connected to an auxiliary support plate (23), and the inner surface of the auxiliary support plate (23) is movably connected to an adjustment plate (24).

8. A crankshaft positioning fixture as claimed in claim 1, characterized in that: A side fixing frame (25) is welded to the side surface of the support plate (1); an adjusting support rod (26) is movably connected to the inner surface of the side fixing frame (25); and a telescopic joint (27) is fixedly connected to the outer surface of the upper end of the adjusting support rod (26).

9. A crankshaft positioning fixture as claimed in claim 8, characterized in that: The upper surface of the fixed end of the telescopic joint (27) is fixedly connected to a fixed rail (28), the upper surface of the telescopic joint (27) is movably connected to a slider (29), the upper surface of the movable end of the telescopic joint (27) is movably plugged with a connecting rod (30), and the upper surface of the telescopic joint (27) next to the connecting rod (30) is movably plugged with a pointer (31).

10. A crankshaft positioning fixture as claimed in claim 1, characterized in that: A scale (32) is fixedly connected to the side surface of the support plate (1), and a base (33) is fixedly connected to the lower surface of the support plate (1).

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