A positioning device for machining automobile crankshafts

Abstract

The present invention relates to the technical field of automobile engine part processing, and specifically relates to a positioning device for processing an automobile crankshaft. The positioning device includes a box body. A rectangular opening is formed in the upper part of the box body, and a fixing plate is fixed in the middle of the rectangular opening. A plurality of first supporting blocks are equidistantly arranged on the upper part of the fixing plate. Second supporting blocks are fixed on both sides of the upper part of the box body, and first clamping blocks are arranged on the upper parts of the second supporting blocks. A plurality of second clamping blocks are movably arranged on both sides inside the box body, and the second clamping blocks on both sides are arranged in a staggered manner. A movable plate is movably arranged at the lower part inside the box body, and a plurality of L-shaped rods are arranged on both sides of the movable plate. The second clamping blocks on both sides are respectively installed at the upper ends of the L-shaped rods on both sides. Hydraulic rods are fixed on both sides of the bottom of the fixing plate, and the output ends of the hydraulic rods are fixed on the upper part of the movable plate. In the present invention, the crankshaft can be quickly fixed, the fixing effect is good, the crankshaft will not swing during processing, and the processing accuracy is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of automobile engine parts processing, in particular to a positioning device for automobile crankshaft processing. Background Art

[0002] The crankshaft is an important component in the automobile engine. One end of the crankshaft is connected to the power input end and the other end is connected to the power output end. It has high requirements for processing accuracy. During the processing of the automobile crankshaft, the crankshaft needs to be completely fixed. Due to the structural characteristics of the automobile crankshaft, it has multiple main journals and multiple side journals, and the main journals and side journals are staggered. After being fixed with conventional fixtures, it is still easy to move and rotate, resulting in reduced processing quality and accuracy.

[0003] CN212552749U is retrieved and disclosed as a positioning device for automobile crankshaft processing, comprising a base plate, a second clamping plate fixedly connected to one side of the upper surface of the base plate, a vertical plate fixedly connected to the other side of the upper surface of the base plate, an electric push rod fixedly connected to the side of the vertical plate close to the second clamping plate, sliding mechanisms are respectively arranged between the two sides of the lower end of the first clamping plate and the upper surface of the base plate, a positioning mechanism is arranged between the middle position of the bottom of one side of the first clamping plate close to the vertical plate and the upper surface of the base plate, the positioning mechanism comprises a connecting rod and a plurality of positioning grooves, the connecting rod is hinged at the middle position of the bottom of one side of the first clamping plate, a plurality of positioning grooves are evenly arranged on the upper surface of the base plate, a clamping block is fixedly connected to one end of the connecting rod, and a spring is fixedly connected to the lower surface of the connecting rod. The positioning device for automobile crankshaft processing can conveniently clamp and fix the workpiece, and has high positioning accuracy and strong stability.

[0004] However, the inventors have discovered that this technical solution still has at least the following defects:

[0005] The above patent only uses conventional clamps to fix the crankshaft. Since the crankshaft has multiple journals and the multiple journals are not on the same axis, the crankshaft will still swing after being clamped by the conventional clamp of the above patent, causing shaking during processing. The fixing effect is poor, which is not conducive to improving the processing accuracy. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a positioning device for automobile crankshaft processing to solve the problem that the existing crankshaft positioning mechanism is unstable in clamping and easily shakes during processing.

[0007] Based on the above purpose, the present invention provides a positioning device for automobile crankshaft processing

[0008] A positioning device for machining an automobile crankshaft, comprising a box body. A rectangular opening is formed in the upper part of the box body, and a fixing plate is fixed in the middle of the rectangular opening. A plurality of first supporting blocks are equidistantly arranged on the upper part of the fixing plate. Second supporting blocks are fixed on both sides of the upper part of the box body. The second supporting blocks and the first supporting blocks are located on the same axis. First clamping blocks are arranged on the upper parts of the second supporting blocks, and the first clamping blocks can cooperate with the second supporting blocks to clamp both ends of the crankshaft tightly.

[0009] A plurality of second clamping blocks are movably arranged on both sides inside the box body, and the second clamping blocks on both sides are arranged in a staggered manner. A movable plate is movably arranged at the lower part inside the box body, and a plurality of L-shaped rods are arranged on both sides of the movable plate. The second clamping blocks on both sides are respectively installed at the upper ends of the L-shaped rods on both sides. Hydraulic rods are fixed on both sides of the bottom of the fixing plate, and the output ends of the hydraulic rods are fixed on the upper part of the movable plate. A linkage mechanism is arranged between both first clamping blocks and the movable plate, and the linkage mechanism is used for driving both first clamping blocks to lift when the movable plate lifts.

[0010] Adjusting mechanisms are arranged on both sides of the box body, and the adjusting mechanisms are used for adjusting the horizontal positions of the second clamping blocks on both sides.

[0011] Furthermore, a plurality of groups of positioning holes are equidistantly formed in the fixing plate. Two positioning pins are fixed at the bottom of each first supporting block, and the positioning pins are adapted to the positioning holes.

[0012] Furthermore, the linkage mechanism comprises two sliding rods which are respectively slidably arranged on both sides of the upper part of the box body, and one ends of the sliding rods extend into the box body. The upper ends of the two sliding rods are respectively arranged on the two first clamping blocks. Tooth grooves are formed on one side of each sliding rod. Gears are rotatably arranged on both sides inside the box body, and both sliding rods are meshed with the two gears through the tooth grooves. Rack bars are fixed at both ends of the movable plate. When the movable plate rises, the two rack bars can be respectively meshed with the two gears.

[0013] Furthermore, a first notch is formed in the upper part of each first clamping block, and one end of each sliding rod is slidably arranged in the first notch. A first spring is arranged in the first notch. Second guiding columns are fixed on both sides of the bottom wall inside the box body, and second notches are formed at the bottoms of the sliding rods. The two second guiding columns are respectively inserted into the two second notches, and second springs are arranged in the second notches.

[0014] Furthermore, the adjusting mechanism comprises adjusting plates arranged on both sides inside the box body. A cross bar is fixed between the plurality of L-shaped rods on both sides, and a roller is rotatably arranged on one side of each cross bar. The two rollers respectively abut against one side of the two adjusting plates. Threaded columns are rotatably arranged on the other sides of the adjusting plates, and the other ends of the threaded columns penetrate through the box body and are fixed with hand wheels. The threaded columns are in threaded connection with the box body. First guiding columns are fixed at both ends of one side of each adjusting plate, and the other ends of the first guiding columns penetrate through the box body and are slidably connected with the box body.

[0015] Further, connecting rods are fixed to one ends of the two first guide posts located at the upper part, and measuring rods are hinged to the upper ends of the connecting rods.

[0016] Further, limit pins are fixed to the upper ends of one sides of the connecting rods. After the measuring rods are turned to one side, their bottoms abut against the limit pins and remain in a horizontal state.

[0017] Further, a plurality of third notches are formed on both sides of the movable plate, and the lower ends of the plurality of L-shaped rods are respectively slidably inserted into the corresponding third notches. Third springs are arranged in the third notches. Fixed seats are fixed to the upper ends of the L-shaped rods, and the second clamping blocks are respectively slidably arranged on the upper parts of the corresponding fixed seats.

[0018] Further, a strip-shaped groove is formed in the upper part of the fixed seat. A slider is slidably arranged in the strip-shaped groove. The slider is fixed to the bottom of the second clamping block. A guide pin is fixed in the strip-shaped groove, and the guide pin penetrates through both sides of the slider and is slidably connected with the slider. Return springs are sleeved on both ends of the guide pin.

[0019] Further, V-shaped pressing grooves are formed on one sides of the first supporting block, the second supporting block, the first clamping block and the second clamping block.

[0020] Advantages of the present invention:

[0021] 1. In the present invention, through the arranged first supporting block, second supporting block, first clamping block and second clamping block, and in cooperation with the linkage mechanism, when machining and positioning a crankshaft, the two ends of the crankshaft can be placed on the two second supporting blocks. At this time, a plurality of main journals are lapped on the plurality of first supporting blocks. Then, the hydraulic rod is started to pull the movable plate to move upward, so that the plurality of second clamping blocks move upward to contact the plurality of side journals. At the same time, when the movable plate moves upward through the linkage mechanism, the two first clamping blocks move downward to cooperate with the second supporting block to clamp and fix the two ends of the crankshaft. Furthermore, the plurality of second clamping blocks on both sides lift and abut against the side journals. There is an upward thrust on both sides of the crankshaft and a downward pressure in the middle of the crankshaft, realizing rapid fixation of the crankshaft. The fixation effect is good, and the crankshaft will not swing during machining, ensuring the machining accuracy. Description of the drawings

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a three-dimensional schematic diagram of an embodiment of the present invention;

[0024] Figure 2 is a top view schematic diagram of an embodiment of the present invention;

[0025] Figure 3 Schematic three-dimensional diagram of the sliding rod and the movable plate according to an embodiment of the present invention;

[0026] Figure 4 Schematic three-dimensional diagram of the adjusting mechanism according to an embodiment of the present invention;

[0027] Figure 5 Schematic three-dimensional diagram of the second clamping block and the fixed seat in an unfolded state according to an embodiment of the present invention;

[0028] Figure 6 Schematic three-dimensional diagram of the first supporting block according to an embodiment of the present invention;

[0029] Figure 7 Schematic side-sectional view according to an embodiment of the present invention.

[0030] The markings in the figure are:

[0031] 1, box body; 2, rectangular opening; 3, fixing plate; 4, first supporting block; 5, second supporting block; 6, first clamping block; 7, sliding rod; 8, connecting rod; 9, measuring rod; 10, handwheel; 11, first guiding column; 12, positioning hole; 13, threaded column; 14, second guiding column; 15, adjusting plate; 16, movable plate; 17, hydraulic rod; 18, teeth; 19, gear; 20, rack; 21, roller; 22, cross bar; 23, L-shaped rod; 24, second clamping block; 25, fixed seat; 26, limit pin; 27, return spring; 28, slider; 29, guiding pin; 30, strip-shaped groove; 31, positioning pin. Detailed implementation manners

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0033] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0034] As Figure 1-7As shown in the figure, a positioning device for machining an automobile crankshaft includes a box body 1. A rectangular opening 2 is formed in the upper part of the box body 1, and a fixing plate 3 is fixed in the middle of the rectangular opening 2. A plurality of first supporting blocks 4 are equidistantly arranged on the upper part of the fixing plate 3. Both sides of the upper part of the box body 1 are fixed with second supporting blocks 5. The second supporting blocks 5 and the first supporting blocks 4 are located on the same axis. First clamping blocks 6 are arranged on the upper parts of the second supporting blocks 5. The first clamping blocks 6 can cooperate with the second supporting blocks 5 to clamp both ends of the crankshaft tightly.

[0035] A plurality of second clamping blocks 24 are movably arranged on both sides inside the box body 1, and the second clamping blocks 24 on both sides are arranged in a staggered manner. A movable plate 16 is movably arranged in the lower part inside the box body 1. A plurality of L-shaped rods 23 are arranged on both sides of the movable plate 16. The second clamping blocks 24 on both sides are respectively installed at the upper ends of the L-shaped rods 23 on both sides. Both sides of the bottom of the fixing plate 3 are fixed with hydraulic rods 17, and the output ends of the hydraulic rods 17 are fixed to the upper part of the movable plate 16. A linkage mechanism is arranged between both first clamping blocks 6 and the movable plate 16. The linkage mechanism is used to drive both first clamping blocks 6 to lift when the movable plate 16 lifts. The crankshaft is fixed quickly, with multiple points interacting with each other, and the fixing effect is good. During the processing operation, swinging is avoided, ensuring the processing accuracy.

[0036] Adjusting mechanisms are arranged on both sides of the box body 1. The adjusting mechanisms are used to adjust the horizontal positions of the second clamping blocks 24 on both sides.

[0037] Multiple groups of positioning holes 12 are equidistantly formed in the fixing plate 3. Two positioning pins 31 are fixed at the bottom of each first supporting block 4. The positioning pins 31 are adapted to the positioning holes 12. The position of the first supporting blocks 4 can be changed or their quantity can be increased or decreased according to the crankshaft with different numbers of cylinders.

[0038] The linkage mechanism includes two sliding rods 7. The two sliding rods 7 are respectively slidably arranged on both sides of the upper part of the box body 1, and one end of each sliding rod 7 extends into the inside of the box body 1. The upper ends of the two sliding rods 7 are respectively arranged on the two first clamping blocks 6. Tooth grooves 18 are formed on one side of each sliding rod 7. Gears 19 are respectively rotatably arranged on both sides inside the box body 1. The two sliding rods 7 are respectively meshed with the two gears 19 through the tooth grooves. Rack bars 20 are fixed at both ends of the movable plate 16. When the movable plate 16 rises, the two rack bars 20 can be respectively meshed with the two gears 19. When the movable plate 16 moves upward, the rack bars 20 on both sides thereof contact the gears 19 on both sides and drive them to rotate, and then drive the two sliding rods 7 to move downward through the tooth grooves 18, driving the two first clamping blocks 6 to move downward to cooperate with the second supporting blocks 5 to clamp and fix both ends of the crankshaft tightly.

[0039] A first slot is formed in the upper part of the first clamping block 6, and one end of each sliding rod 7 is slidably arranged in the first slot. A first spring is arranged in the first slot, so that after the first clamping block 6 and the second supporting block 5 are pressed tightly, a certain buffering stroke can be achieved to ensure that the second clamping block 24 can continue to move upward after being pressed tightly. On both sides of the inner bottom wall of the box body 1, second guiding columns 14 are fixedly arranged. Second slots are formed at the bottoms of the sliding rods 7, and the two second guiding columns 14 are respectively inserted into the two second slots, and second springs are arranged in the second slots.

[0040] The adjusting mechanism includes adjusting plates 15 arranged on both sides inside the box body 1. A cross bar 22 is fixed between multiple L-shaped rods 23 located on both sides, and a roller 21 is rotatably arranged on one side of each cross bar 22. The two rollers 21 are respectively abutted against one side of the two adjusting plates 15. Threaded columns 13 are rotatably arranged on the other side of the adjusting plates 15, and the other ends of the threaded columns 13 respectively penetrate through the box body 1 and are fixed with hand wheels 10. The threaded columns 13 are threadedly connected with the box body 1. At both ends of one side of the adjusting plates 15, first guiding columns 11 are fixedly arranged, and the other ends of the first guiding columns 11 respectively penetrate through the box body 1 and are slidably connected therewith. By shaking the hand wheels 10 to rotate the threaded columns 13, the adjusting plates 15 move horizontally. The adjusting plates 15 move to squeeze the rollers 21 to drive the L-shaped rods 23 to move, so that the positions of multiple second clamping blocks 24 are changed.

[0041] One ends of two first guiding columns 11 located in the upper part are both fixed with connecting rods 8, and measuring rods 9 are hinged to the upper ends of the connecting rods 8.

[0042] Limit pins 26 are fixedly arranged on one side of the upper ends of the connecting rods 8. After the measuring rod 9 is flipped to one side, its bottom abuts against the limit pin 26 and remains in a horizontal state. When one end of the upper measuring rod 9 contacts the outer wall of the side journal of the crankshaft, it means that the adjustment is in place. At this time, after driving the second clamping block 24 to move upward, it can just be aligned with the side journal of the crankshaft.

[0043] Multiple third slots are formed on both sides of the movable plate 16, and the lower ends of multiple L-shaped rods 23 are respectively slidably inserted into the corresponding third slots. Third springs are arranged in the third slots. Fixed seats 25 are fixedly arranged at the upper ends of the L-shaped rods 23, and the second clamping blocks 24 are respectively slidably arranged on the upper parts of the corresponding fixed seats 25.

[0044] A strip-shaped slot 30 is formed in the upper part of the fixed seat 25. A slider 28 is slidably arranged in the strip-shaped slot 30. The slider 28 is fixed to the bottom of the second clamping block 24. A guiding pin 29 is fixed in the strip-shaped slot 30, and the guiding pin 29 penetrates through both sides of the slider 28 and is slidably connected therewith. Return springs 27 are sleeved at both ends of the guiding pin 29. When the second clamping block 24 contacts the crankshaft, fine adjustment can be performed under the action of the slider 28, the guiding pin 29 and the return spring 27 to ensure complete fitting with the side journal of the crankshaft.

[0045] The first supporting block 4, the second supporting block 5, the first clamping block 6, and one side of the second clamping block 24 all have V-shaped pressing grooves.

[0046] Working principle: When using this device to process and position the crankshaft, the two ends of the crankshaft can be placed on the two second supporting blocks 5. At this time, multiple main journals are lapped on the multiple first supporting blocks 4. Then, start the two hydraulic rods 17 to pull the movable plate 16 upward, so that the multiple second clamping blocks 24 move upward to contact the multiple side journals of the crankshaft. When the movable plate 16 moves upward, the racks 20 on both sides thereof contact the gears 19 on both sides and drive them to rotate. Then, drive the two sliding rods 7 to move downward through the teeth 18, drive the two first clamping blocks 6 to move downward, and cooperate with the second supporting blocks 5 to tightly press and fix the two ends of the crankshaft. Furthermore, when the movable plate 16 continues to move upward, the multiple second clamping blocks 24 on both sides lift and tightly press against the side journals. At this time, there is an upward thrust on both sides of the crankshaft and a downward pressure in the middle, quickly fixing the crankshaft. When positioning crankshafts of different specifications, the two measuring rods 9 can be flipped to one side so that their bottoms contact the limit pins 26 to keep horizontal. Then, turn the handwheel 10 to rotate the threaded column 13, so that the adjusting plate 15 moves horizontally. The adjusting plate 15 moves to squeeze the roller 21 to drive the L-shaped rod 23 to move, thereby changing the positions of the multiple second clamping blocks 24. When one end of the upper measuring rod 9 contacts the outer wall of the side journal of the crankshaft, it means that the adjustment is in place. At this time, after driving the second clamping blocks 24 to move upward, they can just align with the side journals of the crankshaft. When the second clamping blocks (24) contact the side journals of the crankshaft, fine adjustment can be performed under the action of the slider 28, the guide pin 29, and the return spring 27 to ensure complete fitting with the side journals of the crankshaft.

[0047] Those of ordinary skill in the art should understand that the discussion of any above embodiment is only exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0048] The present invention aims to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A positioning device for machining an automobile crankshaft, comprising a box body (1), characterized in that, a rectangular opening (2) is formed in the upper part of the box body (1), and a fixing plate (3) is fixed in the middle of the rectangular opening (2). A plurality of first supporting blocks (4) are equidistantly arranged on the upper part of the fixing plate (3). Second supporting blocks (5) are fixed on both sides of the upper part of the box body (1). The second supporting blocks (5) and the first supporting blocks (4) are located on the same axis. First clamping blocks (6) are arranged on the upper parts of the second supporting blocks (5). The first clamping blocks (6) can cooperate with the second supporting blocks (5) to clamp both ends of the crankshaft tightly; a plurality of second clamping blocks (24) are movably arranged on both sides inside the box body (1), and the second clamping blocks (24) on both sides are arranged in a staggered manner. A movable plate (16) is movably arranged in the lower part inside the box body (1). A plurality of L-shaped rods (23) are arranged on both sides of the movable plate (16). The second clamping blocks (24) on both sides are respectively installed at the upper ends of the L-shaped rods (23) on both sides. Hydraulic rods (17) are fixed on both sides of the bottom of the fixing plate (3), and the output ends of the hydraulic rods (17) are fixed on the upper part of the movable plate (16). A linkage mechanism is arranged between both first clamping blocks (6) and the movable plate (16). The linkage mechanism is used to drive both first clamping blocks (6) to lift when the movable plate (16) lifts; adjusting mechanisms are arranged on both sides of the box body (1). The adjusting mechanisms are used to adjust the horizontal positions of the second clamping blocks (24) on both sides; the linkage mechanism includes two sliding rods (7). The two sliding rods (7) are respectively slidably arranged on both sides of the upper part of the box body (1), and one ends of the sliding rods (7) extend into the box body (1). The upper ends of the two sliding rods (7) are respectively arranged on the two first clamping blocks (6). Tooth teeth (18) are formed on one side of each sliding rod (7). Gears (19) are rotatably arranged on both sides inside the box body (1). The two sliding rods (7) are respectively meshed with the two gears (19) through the tooth teeth. Rack bars (20) are fixed at both ends of the movable plate (16). When the movable plate (16) rises, the two rack bars (20) can be respectively meshed with the two gears (19); the adjusting mechanism includes adjusting plates (15) arranged on both sides inside the box body (1). A cross bar (22) is fixed between the L-shaped rods (23) on both sides. A roller (21) is rotatably arranged on one side of each cross bar (22). The two rollers (21) respectively abut against one side of the two adjusting plates (15). Threaded columns (13) are rotatably arranged on the other side of each adjusting plate (15). The other ends of the threaded columns (13) penetrate through the box body (1) and are fixed with hand wheels (10). The threaded columns (13) are in threaded connection with the box body (1). First guiding columns (11) are fixed at both ends of one side of each adjusting plate (15). The other ends of the first guiding columns (11) penetrate through the box body (1) and are slidably connected with the box body (1); Both sides of the movable plate (16) are provided with a plurality of third notches, and the lower ends of the plurality of L-shaped rods (23) are respectively slidably inserted into the corresponding third notches. Third springs are arranged in the third notches. Fixed seats (25) are fixed at the upper ends of the L-shaped rods (23), and the second clamping blocks (24) are respectively slidably arranged on the upper parts of the corresponding fixed seats (25). A strip-shaped groove (30) is formed in the upper part of the fixed seat (25). A slider (28) is slidably arranged in the strip-shaped groove (30). The slider (28) is fixed to the bottom of the second clamping block (24). A guide pin (29) is fixed in the strip-shaped groove (30), and the guide pin (29) penetrates through both sides of the slider (28) and is slidably connected therewith. Return springs (27) are sleeved at both ends of the guide pin (29).

2. A positioning device for machining an automobile crankshaft according to claim 1, characterized in that, A plurality of groups of positioning holes (12) are equidistantly formed in the fixing plate (3). Two positioning pins (31) are fixed to the bottom of the first supporting block (4). The positioning pins (31) are adapted to the positioning holes (12).

3. A positioning device for machining an automobile crankshaft according to claim 2, characterized in that, A first notch is formed in the upper part of the first clamping block (6). One ends of the sliding rods (7) are respectively slidably arranged in the first notch. A first spring is arranged in the first notch. Second guiding columns (14) are fixed to both sides of the inner bottom wall of the box body (1). Second notches are formed at the bottoms of the sliding rods (7). The two second guiding columns (14) are respectively inserted into the two second notches, and second springs are arranged in the second notches.

4. A positioning device for machining an automobile crankshaft according to claim 3, characterized in that, Connecting rods (8) are fixed to one ends of the two upper first guiding columns (11), and measuring rods (9) are hinged to the upper ends of the connecting rods (8).

5. A positioning device for machining an automobile crankshaft according to claim 4, characterized in that, Limit pins (26) are fixed to the upper sides of the connecting rods (8). After the measuring rod (9) is turned to one side, its bottom abuts against the limit pin (26) and maintains a horizontal state.

6. A positioning device for machining an automobile crankshaft according to any one of claims 1-5, characterized in that, V-shaped pressing grooves are formed on one sides of the first supporting block (4), the second supporting block (5), the first clamping block (6) and the second clamping block (24).

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