Grinding device for outer surfaces of automobile forgings

Abstract

The invention relates to an automobile forge piece outer surface polishing device which comprises a base, an auxiliary feeding mechanism used for feeding and discharging a crankshaft, a clamping mechanism used for clamping and fixing the crankshaft and a polishing mechanism used for polishing the crankshaft are installed on the base, and the auxiliary feeding mechanism comprises a supporting frame installed on the base; axial rotation of the to-be-polished main journal is guaranteed, then in the polishing process, uniform polishing is achieved, it is guaranteed that the polishing wheel can make uniform contact with all the surfaces of the main journal, local excessive abrasion or uneven polishing is avoided, the surface quality is improved, the polishing wheel continuously acts on the surface of a crankshaft through rotation movement, the pause and adjustment time is shortened, and the working efficiency is improved. Axial rotation is beneficial for maintaining the geometrical shape of the crankshaft, deformation caused by single-side stress is avoided, and it is ensured that the size and the shape meet the requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive forging processing, and particularly to a grinding device for the outer surface of automotive forgings. Background Art

[0002] Automotive forgings refer to automotive components manufactured by forging processes. Forging is a processing method that uses forging machinery to apply pressure to metal billets, causing them to undergo plastic deformation to obtain forgings with certain mechanical properties, shapes, and dimensions. Due to their excellent mechanical properties and reliability, automotive forgings are widely used in key parts of automobiles.

[0003] The crankshaft is an important component of the engine, which is made by forging process. After forging, a grinding device is used to grind and polish the main journal of the crankshaft.

[0004] The handling of crankshafts relies on manual labor, which is inefficient and labor-intensive. Especially for large or heavy crankshafts, it increases the operation time, reduces production efficiency, and is prone to causing fatigue or injury to operators. At the same time, when the existing grinding devices are grinding, they achieve the axial rotation of the entire crankshaft, that is, the axial rotation is carried out at the end of the crankshaft. Generally, a flexible grinding belt is used to grind the main journals of different parts. In this grinding method, the grinding belt cannot evenly contact all surfaces of the main journal, resulting in local excessive wear or uneven grinding. The grinding belt acts on the crankshaft surface intermittently, increasing the pause and adjustment time, and is also prone to deformation caused by unilateral force. Summary of the Invention

[0005] The problem solved by the present invention is to provide a grinding device for the outer surface of automotive forgings, which solves the technical problems that the handling of crankshafts relies on manual labor, is inefficient and labor-intensive, especially for large or heavy crankshafts, increases the operation time, reduces production efficiency, and is prone to causing fatigue or injury to operators. At the same time, when the existing grinding devices are grinding, they achieve the axial rotation of the entire crankshaft, that is, the axial rotation is carried out at the end of the crankshaft. Generally, a flexible grinding belt is used to grind the main journals of different parts. In this grinding method, the grinding belt cannot evenly contact all surfaces of the main journal, resulting in local excessive wear or uneven grinding. The grinding belt acts on the crankshaft surface intermittently, increasing the pause and adjustment time, and is also prone to deformation caused by unilateral force.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An external surface grinding device for automobile forgings, comprising a base, on which an auxiliary feeding mechanism for loading and unloading crankshafts, a clamping mechanism for clamping and fixing the crankshaft, and a grinding mechanism for grinding the crankshaft are installed. The auxiliary feeding mechanism includes a support frame installed on the base. A translation seat is slidably installed on the bottom side of the support frame. Wheel seats are slidably installed on the bottom sides of both ends of the translation seat, and a connecting rope is retractably installed on the bottom side of the wheel seat. A hook is installed at the bottom end of the connecting rope;

[0008] The clamping mechanism includes a sliding table slidably installed on the base. Slide frames are slidably installed at both ends of the top side of the sliding table. A rotating table is rotatably installed inside the slide frame. A turntable is slidably installed on the rotating table. A three-jaw chuck is rotatably installed at the center of the turntable. Adjusting seats are symmetrically installed on both sides of the sliding table. Slide arms are slidably installed on both of the adjusting seats. A laser distance sensor is installed on the slide arm. The laser distance sensor and the center of the three-jaw chuck are on the same horizontal line;

[0009] The grinding mechanism includes an electric slide rail installed on the base. A grinding wheel frame is slidably installed on the electric slide rail. A grinding wheel is rotatably installed inside the grinding wheel frame.

[0010] Preferably, a first motor is installed on the support frame. A first threaded rod threadedly connected to the translation seat is installed at the output end of the first motor. A first slide rail slidably connected to the translation seat is installed on the bottom side of the top of the support frame.

[0011] Preferably, a second motor is installed at the end of the translation seat. A second threaded rod is installed at the output end of the second motor. The threading directions of both ends of the second threaded rod are opposite, and both ends of the second threaded rod are threadedly connected to the wheel seats respectively. A second slide rail slidably connected to the wheel seats is installed on the bottom side of the translation seat.

[0012] Preferably, a third motor is installed on the outer side of the wheel seat. A wire wheel is installed inside the wheel seat at the output end of the third motor, and the wire wheel is connected to the connecting rope.

[0013] Preferably, a fourth motor is installed on the base. A third threaded rod threadedly connected to the sliding table is installed at the output end of the fourth motor. A third slide rail slidably connected to the sliding table is installed on the base;

[0014] A fifth motor is installed at the end of the sliding table. A fourth threaded rod is installed at the output end of the fifth motor. The threading directions of both ends of the fourth threaded rod are opposite, and both ends of the fourth threaded rod are threadedly connected to the two slide frames respectively. A fourth slide rail slidably connected to the slide frames is installed on the sliding table

[0015] Preferably, a sixth motor is installed at the end of the rotating table. A fifth threaded rod is installed inside the rotating table at the output end of the sixth motor, and the fifth threaded rod is threadedly connected to the turntable.

[0016] Preferably, a speed reducer is installed on the outside of one of the sliding brackets. The output end of the speed reducer is connected to the center of the turntable, and the input end of the speed reducer is connected to the output end of the seventh motor;

[0017] External teeth are provided on the outside of one of the three-jaw chucks. An eighth motor is installed on the turntable. The output end of the eighth motor is installed with a rotating gear, and the rotating gear meshes with the external teeth.

[0018] Preferably, transmission boxes are installed at the ends of the two adjusting seats. Synchronous wheels are installed at both ends inside the transmission boxes, and the two synchronous wheels are connected by a synchronous belt. Sixth threaded rods are installed on both of the synchronous wheels, and the sixth threaded rods are located inside the adjusting seats and are threadedly connected to the sliding arms. Fifth slide rails that are slidably connected to the sliding arms are installed on the adjusting seats. A ninth motor is installed on the transmission box, and the output end of the ninth motor is connected to one of the synchronous wheels.

[0019] Preferably, a tenth motor is installed on the grinding wheel frame, and the output end of the tenth motor is connected to the grinding wheel.

[0020] Preferably, the specific operation steps of the device are as follows:

[0021] Step 1: The third motor works to drive the wire wheel to rotate, wind and unwind the connecting rope, and realize the lifting of the hook. At the same time, the second motor works to drive the second threaded rod to rotate, and then drive the wheel seat connected by threads to translate, adjust the distance between the two hooks to match the length of the crankshaft, hang the hooks on both ends of the crankshaft, the wire wheel rotates to drive the crankshaft to move upward, the fourth motor works to drive the third threaded rod to rotate, and then drive the slide table connected by threads to move longitudinally, move the clamping mechanism to below the support frame. At this time, the auxiliary feeding mechanism moves the crankshaft downward to correspond to the three-jaw chuck. The fifth motor works to drive the fourth threaded rod to rotate, and then drive the two sliding brackets to move, adjust the distance between the two three-jaw chucks, insert the end of the crankshaft into the three-jaw chuck, clamp and fix the crankshaft through the three-jaw chuck, and then move the clamping mechanism to the grinding station;

[0022] Step 2: The eighth motor works to drive the rotating gear to rotate, which cooperates with the meshing external teeth to drive the three-jaw chuck and the crankshaft to rotate, and rotate the main journal part of the crankshaft to the horizontal state. At this time, the ninth motor works, and through the synchronous pulley and synchronous belt drive, drives the two sixth threaded rods to rotate synchronously, and the two sliding arms move synchronously to both sides of the main journal of the crankshaft. The laser distance sensor measures the distance. At this time, the sixth motor on the horizontally arranged turntable works to drive the fifth threaded rod to rotate, and then drives the threaded-connected turntable to move until the two laser distance sensors measure the same distance from the main journal of the crankshaft. At this time, the main journal of the crankshaft and the output end of the reducer are concentric. Through the work of the seventh motor, the main journal of the crankshaft rotates axially, the grinding wheel frame moves along the electric slide rail to adjust the position of the grinding wheel, the tenth motor drives the grinding wheel to rotate, and the slide table moves to drive the main journal of the crankshaft to contact the grinding wheel to complete the grinding;

[0023] Step 3: Repeat the work in Step 2, adjust the main journals on the crankshaft to be concentric with the output end of the reducer in turn, then realize the axial rotation of the main journal, and complete the grinding of the main journal by the grinding wheel. After grinding, move the clamping mechanism under the auxiliary loading and unloading mechanism, and perform the loading and unloading of the crankshaft through the auxiliary loading and unloading mechanism.

[0024] The beneficial effects of the present invention are: through the mutual cooperation of the auxiliary loading and unloading mechanism and the clamping mechanism, it is convenient to complete the loading and unloading of crankshafts of different specifications on the clamping mechanism, realize convenient loading and unloading, and greatly improve the processing efficiency of the crankshaft;

[0025] Through the rotation of the three-jaw chuck and the crankshaft, the main journal part of the crankshaft is rotated to the horizontal state. The two sliding arms move synchronously to both sides of the main journal of the crankshaft. The laser distance sensor measures the distance. The turntable moves to adjust the distance between the main journal of the crankshaft and the two laser distance sensors to be the same, realizing the centering operation of the main journal and the reducer. Furthermore, when the three-jaw chuck and the crankshaft rotate, it is ensured that the main journal to be ground rotates axially. Furthermore, during the grinding process, uniform grinding is realized, ensuring that the grinding wheel can uniformly contact each surface of the main journal, avoiding local excessive wear or uneven grinding, improving the surface quality. The rotational movement enables the grinding wheel to continuously act on the surface of the crankshaft, reducing the pause and adjustment time, improving the working efficiency, helping to disperse the grinding force, reducing vibration, reducing the risk of damage to the crankshaft and tools, and improving the operation safety. The axial rotation helps to maintain the geometric shape of the crankshaft, avoiding deformation caused by unilateral force and ensuring that the dimensions and shape meet the requirements. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the auxiliary loading and unloading mechanism of the present invention;

[0028] Figure 3 The first structural schematic diagram of the clamping mechanism of the present invention;

[0029] Figure 4 The second structural schematic diagram of the clamping mechanism of the present invention;

[0030] Figure 5 The sectional view of the base and the sliding table of the present invention;

[0031] Figure 6 The structural schematic diagram of the grinding mechanism of the present invention;

[0032] Figure 7 The rear view of the present invention.

[0033] Legend:

[0034] 1. Base; 2. Auxiliary feeding mechanism; 3. Clamping mechanism; 4. Grinding mechanism; 5. Support frame; 6. First motor; 7. First threaded rod; 8. Translation seat; 9. Second motor; 10. Second threaded rod; 11. Wheel seat; 12. Third motor; 13. Wire wheel; 14. Connecting rope; 15. Hook; 16. Fourth motor; 17. Third threaded rod; 18. Sliding table; 19. Fifth motor; 20. Fourth threaded rod; 21. Sliding frame; 22. Turntable; 23. Sixth motor; 24. Fifth threaded rod; 25. Turntable; 26. Three-jaw chuck; 27. Reducer; 28. Seventh motor; 29. External teeth; 30. Eighth motor; 31. Rotating teeth; 32. Adjusting seat; 33. Sixth threaded rod; 34. Sliding arm; 35. Laser ranging sensor; 36. Transmission box; 37. Ninth motor; 38. Electric slide rail; 39. Grinding wheel frame; 40. Grinding wheel; 41. Tenth motor. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0036] The following gives specific embodiments.

[0037] See Figures 1 to 7, An external surface grinding device for automobile forgings, including a base 1, on which an auxiliary feeding mechanism 2 for loading and unloading crankshafts, a clamping mechanism 3 for clamping and fixing the crankshaft, and a grinding mechanism 4 for grinding the crankshaft are installed. The auxiliary feeding mechanism 2 includes a support frame 5 installed on the base 1. A translation seat 8 is slidably installed on the bottom side of the support frame 5. Wheel seats 11 are slidably installed on the bottom sides of both ends of the translation seat 8. And a connecting rope 14 is retractably installed on the bottom side of the wheel seat 11. A hook 15 is installed at the bottom end of the connecting rope 14. A first motor 6 is installed on the support frame 5. A first threaded rod 7 threadedly connected to the translation seat 8 is installed at the output end of the first motor 6. A first slide rail slidably connected to the translation seat 8 is installed on the bottom side of the top of the support frame 5. A second motor 9 is installed at the end of the translation seat 8. A second threaded rod 10 is installed at the output end of the second motor 9. The threading directions of both ends of the second threaded rod 10 are opposite, and both ends of the second threaded rod 10 are respectively threadedly connected to the wheel seats 11. A second slide rail slidably connected to the wheel seats 11 is installed on the bottom side of the translation seat 8. A third motor 12 is installed on the outside of the wheel seat 11. A wire reel 13 is installed inside the wheel seat 11 at the output end of the third motor 12. And the wire reel 13 is connected to the connecting rope 14. By the operation of the first motor 6, the first threaded rod 7 rotates, thereby driving the translation seat 8 in threaded connection to move, facilitating the removal of the ground crankshaft from the crankshaft transport rack and at the same time lifting and installing the unground crankshaft. By the operation of the third motor 12, the wire reel 13 rotates to wind and unwind the connecting rope 14, realizing the lifting and lowering of the hook 15. At the same time, the second motor 9 operates to drive the second threaded rod 10 to rotate, thereby driving the wheel seats 11 in threaded connection to translate, adjusting the distance between the two hooks 15 to match the length of the crankshaft, hanging the hooks 15 at both ends of the crankshaft, and the wire reel 13 rotates to drive the crankshaft to move upward;

[0038] The clamping mechanism 3 includes a slide table 18 slidably installed on the base 1. Slide frames 21 are slidably installed at both ends of the top side of the slide table 18. A turntable 22 is rotatably installed inside the slide frame 21. A turntable 25 is slidably installed on the turntable 22. A three-jaw chuck 26 is rotatably installed at the center of the turntable 25. Adjusting seats 32 are symmetrically installed on both sides of the slide table 18. Slide arms 34 are slidably installed on both of the two adjusting seats 32. A laser distance sensor 35 is installed on the slide arm 34. The laser distance sensor 35 and the center of the three-jaw chuck 26 are on the same horizontal line;

[0039] The grinding mechanism 4 includes an electric slide rail 38 installed on the base 1. A grinding wheel frame 39 is slidably installed on the electric slide rail 38. A grinding wheel 40 is rotatably installed inside the grinding wheel frame 39.

[0040] A fourth motor 16 is installed on the base 1. The output end of the fourth motor 16 is installed with a third threaded rod 17 that is threadedly connected to the sliding table 18. A third slide rail that is slidably connected to the sliding table 18 is installed on the base 1. The end of the sliding table 18 is installed with a fifth motor 19. The output end of the fifth motor 19 is installed with a fourth threaded rod 20. The thread directions at both ends of the fourth threaded rod 20 are opposite, and both ends of the fourth threaded rod 20 are respectively threadedly connected to two sliding frames 21. A fourth slide rail that is slidably connected to the sliding frame 21 is installed on the sliding table 18. The end of the turntable 22 is installed with a sixth motor 23. The output end of the sixth motor 23 is installed with a fifth threaded rod 24 inside the turntable 22, and the fifth threaded rod 24 is threadedly connected to the turntable 25. A speed reducer 27 is installed on the outside of one of the sliding frames 21. The output end of the speed reducer 27 is connected to the center of the turntable 22. The input end of the speed reducer 27 is connected to the output end of a seventh motor 28. External teeth 29 are provided on the outside of one of the three-jaw chucks 26. An eighth motor 30 is installed on the turntable 25. The output end of the eighth motor 30 is installed with a rotating gear 31, and the rotating gear 31 meshes with the external teeth 29. Transmission boxes 36 are installed at the ends of two adjusting seats 32. Synchronous wheels are installed at both ends inside the transmission boxes 36, and the two synchronous wheels are connected by a synchronous belt. Sixth threaded rods 33 are installed on both synchronous wheels, and the sixth threaded rods 33 are located inside the adjusting seats 32 and are threadedly connected to the sliding arms 34. Fifth slide rails that are slidably connected to the sliding arms 34 are installed on the adjusting seats 32. A ninth motor 37 is installed on the transmission box 36, and the output end of the ninth motor 37 is connected to one of the synchronous wheels. By the operation of the fourth motor 16, the third threaded rod 17 rotates, thereby driving the longitudinally moving sliding table 18 that is threadedly connected, and moving the clamping mechanism 3 below the support frame 5. At this time, the auxiliary feeding mechanism 2 moves the crankshaft downward to correspond to the three-jaw chuck 26. By the operation of the fifth motor 19, the fourth threaded rod 20 rotates, thereby driving the two sliding frames 21 to move, adjusting the distance between the two three-jaw chucks 26, inserting the end of the crankshaft into the three-jaw chuck 26, and clamping and fixing the crankshaft by the three-jaw chuck 26. Then, the clamping mechanism 3 moves to the grinding station. By the operation of the eighth motor 30, the rotating gear 31 rotates, and in cooperation with the engaged external teeth 29, drives the three-jaw chuck 26 and the crankshaft to rotate, rotating the main journal part of the crankshaft to the horizontal state. At this time, by the operation of the ninth motor 37, through the transmission of the synchronous wheels and the synchronous belt, the two sixth threaded rods 33 are driven to rotate synchronously, and the two sliding arms 34 move synchronously to the two sides of the main journal of the crankshaft. The distance is measured by the laser distance sensor 35. At this time, the sixth motor 23 on the horizontally arranged turntable 22 operates to drive the fifth threaded rod 24 to rotate, thereby driving the threadedly connected turntable 25 to move until the two laser distance sensors 35 measure the same distance from the main journal of the crankshaft. At this time, the main journal of the crankshaft and the output end of the speed reducer 27 are concentric. By the operation of the seventh motor 28, the main journal of the crankshaft rotates axially. The grinding wheel frame 39 moves along the electric slide rail 38 to adjust the position of the grinding wheel 40. Repeat the operation to adjust the main journal on the crankshaft to be concentric with the output end of the speed reducer 27.Then, the axial rotation of the main journal is realized, and the main journal is polished by the grinding wheel 40. After polishing, the clamping mechanism 3 is moved below the auxiliary loading and unloading mechanism 2, and the crankshaft is loaded and unloaded through the auxiliary loading and unloading mechanism 2.

[0041] A tenth motor 41 is installed on the grinding wheel frame 39. The output end of the tenth motor 41 is connected to the grinding wheel 40. The grinding wheel 40 is driven to rotate by the tenth motor 41. The movement of the sliding table 18 drives the main journal of the crankshaft to contact the grinding wheel 40 to complete the polishing.

[0042] Through the mutual cooperation of the auxiliary loading and unloading mechanism 2 and the clamping mechanism 3, it is convenient to load and unload crankshafts of different specifications on the clamping mechanism 3, realizing convenient loading and unloading, greatly improving the processing efficiency of the crankshaft;

[0043] Through the three-jaw chuck 26 and the rotation of the crankshaft, the main journal part of the crankshaft is rotated to the horizontal state. The two sliding arms 34 move synchronously to both sides of the main journal of the crankshaft. Through the laser distance sensor 35 for distance measurement, the turntable 25 moves to adjust the distances between the main journal of the crankshaft and the two laser distance sensors 35 to be the same, realizing the centering operation of the main journal and the reducer 27. Furthermore, when the three-jaw chuck 26 and the crankshaft rotate, it is ensured that the main journal to be polished rotates axially. Thus, during the polishing process, uniform polishing is achieved, ensuring that the grinding wheel 40 can uniformly contact each surface of the main journal, avoiding local excessive wear or uneven polishing, improving the surface quality. The rotational movement enables the grinding wheel 40 to continuously act on the surface of the crankshaft, reducing the pause and adjustment time, improving the working efficiency, helping to disperse the polishing force, reducing vibration, reducing the risk of damage to the crankshaft and the tool, and improving the operation safety. The axial rotation helps to maintain the geometric shape of the crankshaft, avoiding deformation caused by unilateral force and ensuring that the dimensions and shape meet the requirements.

[0044] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A device for polishing the outer surface of automobile forgings, characterized in that: The invention comprises a base (1), on which an auxiliary loading mechanism (2) for loading and unloading crankshafts, a clamping mechanism (3) for clamping and fixing the crankshafts, and a grinding mechanism (4) for grinding the crankshafts are installed. The auxiliary loading mechanism (2) comprises a support frame (5) installed on the base (1), a translation seat (8) is slidably installed on the bottom side of the support frame (5), wheel seats (11) are slidably installed on the bottom sides of both ends of the translation seat (8), and a connecting rope (14) is retractably installed on the bottom side of the wheel seat (11), and a hook (15) is installed at the bottom end of the connecting rope (14); The clamping mechanism (3) comprises a slide (18) slidably mounted on a base (1), slides (21) are slidably mounted on both ends of the top side of the slide (18), a turntable (22) is rotatably mounted inside the slide (21), a turntable (25) is slidably mounted on the turntable (22), a three-jaw chuck (26) is rotatably mounted at the center of the turntable (25), adjustment seats (32) are symmetrically mounted on both sides of the slide (18), slide arms (34) are slidably mounted on the two adjustment seats (32), a laser distance sensor (35) is mounted on the slide arm (34), and the laser distance sensor (35) and the center of the three-jaw chuck (26) are located on the same horizontal line; The grinding mechanism (4) comprises an electric slide rail (38) mounted on a base (1), a grinding wheel frame (39) being slidably mounted on the electric slide rail (38), and a grinding wheel (40) being rotatably mounted in the grinding wheel frame (39).

2. The device for polishing the outer surface of automobile forgings according to claim 1, characterized in that: A first motor (6) is installed on the support frame (5); a first threaded rod (7) threadedly connected to the translation seat (8) is installed at the output end of the first motor (6); and a first slide rail slidably connected to the translation seat (8) is installed on the bottom side of the top of the support frame (5).

3. The device for polishing the outer surface of automobile forgings according to claim 2, characterized in that: A second motor (9) is installed at the end of the translation seat (8), and a second threaded rod (10) is installed at the output end of the second motor (9). The threads at both ends of the second threaded rod (10) are in opposite directions, and the two ends of the second threaded rod (10) are respectively threadedly connected to the wheel seat (11), and a second slide rail slidably connected to the wheel seat (11) is installed on the bottom side of the translation seat (8).

4. The device for polishing the outer surface of automobile forgings according to claim 3, characterized in that: A third motor (12) is installed outside the wheel seat (11); an output end of the third motor (12) is located inside the wheel seat (11); a wire wheel (13) is installed inside the wheel seat (11); and the wire wheel (13) is connected to a connecting rope (14).

5. The device for polishing the outer surface of automobile forgings according to claim 4, characterized in that: A fourth motor (16) is mounted on the base (1); a third threaded rod (17) threadedly connected to a slide table (18) is mounted on an output end of the fourth motor (16); and a third slide rail slidably connected to the slide table (18) is mounted on the base (1); A fifth motor (19) is installed at the end of the slide (18), a fourth threaded rod (20) is installed at the output end of the fifth motor (19), the threads at both ends of the fourth threaded rod (20) are in opposite directions, and the two ends of the fourth threaded rod (20) are respectively threadedly connected to two slides (21), and a fourth slide rail slidably connected to the slide (21) is installed on the slide (18).

6. The device for polishing the outer surface of automobile forgings according to claim 5, characterized in that: A sixth motor (23) is installed at the end of the turntable (22); a fifth threaded rod (24) is installed at the output end of the sixth motor (23) located inside the turntable (22); and the fifth threaded rod (24) is threadedly connected to the turntable (25).

7. The device for polishing the outer surface of automobile forgings according to claim 6, characterized in that: A reducer (27) is installed on the outside of one of the slides (21), the output end of the reducer (27) is connected to the center of the turntable (22), and the input end of the reducer (27) is connected to the output end of the seventh motor (28); One of the three-jaw chucks (26) is provided with external teeth (29) on its outer side, an eighth motor (30) is mounted on the rotary disk (25), a rotating tooth (31) is mounted on the output end of the eighth motor (30), and the rotating tooth (31) is meshed with the external teeth (29).

8. The device for polishing the outer surface of automobile forgings according to claim 7, characterized in that: A transmission box (36) is installed at the ends of the two adjustment seats (32), synchronous wheels are installed at both ends of the transmission box (36), and the two synchronous wheels are connected by a synchronous belt, and the two synchronous wheels are both installed with a sixth threaded rod (33), and the sixth threaded rod (33) is located in the adjustment seat (32) and is threadedly connected to the slide arm (34), and a fifth slide rail slidably connected to the slide arm (34) is installed on the adjustment seat (32), and a ninth motor (37) is installed on the transmission box (36), and the output end of the ninth motor (37) is connected to one of the synchronous wheels.

9. The device for polishing the outer surface of automobile forgings according to claim 8, characterized in that: A tenth motor (41) is mounted on the grinding wheel frame (39), and an output end of the tenth motor (41) is connected to a grinding wheel (40).

10. The device for polishing the outer surface of automobile forgings according to claim 9, characterized in that: The specific operation steps of the device are as follows: Step 1: The third motor (12) is driven to rotate the wire wheel (13), and the connecting rope (14) is wound and unwound to realize the lifting and lowering of the hook (15). At the same time, the second motor (9) is driven to rotate the second threaded rod (10), thereby driving the threaded wheel seat (11) to translate, and adjusting the distance between the two hooks (15) to match the length of the crankshaft. The hooks (15) are hung on both ends of the crankshaft. The wire wheel (13) rotates to drive the crankshaft upward, and the fourth motor (16) is driven to rotate the third threaded rod (17), thereby driving The threaded slide (18) moves longitudinally to move the clamping mechanism (3) to the bottom of the support frame (5). At this time, the auxiliary feeding mechanism (2) moves the crankshaft downward to correspond to the three-jaw chuck (26). The fourth threaded rod (20) is driven to rotate by the fifth motor (19), thereby driving the two slides (21) to move, adjusting the distance between the two three-jaw chucks (26), inserting the end of the crankshaft into the three-jaw chuck (26), and clamping and fixing the crankshaft by the three-jaw chuck (26). Then, the clamping mechanism (3) moves to the grinding station. Step 2: The eighth motor (30) drives the rotating gear (31) to rotate, cooperates with the meshing external gear (29), drives the three-jaw chuck (26) and the crankshaft to rotate, and rotates the main shaft neck of the crankshaft to a horizontal state. At this time, the ninth motor (37) drives the two sixth threaded rods (33) to rotate synchronously through the synchronous wheel and the synchronous belt transmission. The two sliding arms (34) move synchronously to the two sides of the main shaft neck of the crankshaft, and the laser distance sensor (35) measures the distance. At this time, the sixth motor (23) on the horizontally arranged turntable (22) drives the fifth threaded rod (33) to rotate synchronously. The rod (24) rotates, thereby driving the threaded turntable (25) to move, until the two laser distance measuring sensors (35) measure the same distance with the main journal of the crankshaft, at which time the main journal of the crankshaft and the output end of the reducer (27) are cocentric, and the seventh motor (28) works to cause the main journal of the crankshaft to rotate axially, and the grinding wheel frame (39) moves along the electric slide rail (38) to adjust the position of the grinding wheel (40), and the grinding wheel (40) is driven to rotate by the tenth motor (41), and the slide table (18) moves to drive the main journal of the crankshaft to contact the grinding wheel (40) to complete the grinding; Step 3: Repeat the work of step 2, adjust the main journal on the crankshaft to be co-centric with the output end of the reducer (27), and then realize the axial rotation of the main journal. The main journal is polished by the grinding wheel (40). After polishing, the clamping mechanism (3) is moved to the bottom of the auxiliary loading mechanism (2), and the crankshaft is loaded and unloaded by the auxiliary loading mechanism (2).

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