Crankshaft polishing equipment and polishing method

Abstract

The invention provides crankshaft polishing equipment and a crankshaft polishing method.The crankshaft polishing equipment comprises a shell, a crankshaft and a polishing mechanism, the inner walls of the two sides of the shell are each provided with an adjusting assembly for clamping and rotating the crankshaft, and the inner wall of the top of the shell is provided with a moving assembly for driving the polishing mechanism to move transversely and longitudinally; the polishing mechanism comprises two sets of driving parts, two sets of polishing parts, a fixing sleeve and a counterweight part, the upper ends of the driving parts are connected with the moving assembly, the lower ends of the driving parts are connected with the polishing parts, and the two sets of driving parts and the two sets of polishing parts are symmetrically arranged; according to the crankshaft polishing device, through mutual cooperation of the transverse moving assembly, the longitudinal moving assembly and the polishing mechanism, different positions of a crankshaft can be polished, the application range of the crankshaft polishing device is greatly widened, polishing equipment for other polishing procedures does not need to be additionally arranged, and the production cost is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of crankshaft polishing, and particularly relates to a crankshaft polishing device and a polishing method. Background Art

[0002] The crankshaft is the most important component in an engine. It bears the force transmitted by the connecting rod, converts it into torque, outputs it through the crankshaft, and drives other accessories on the engine to work. The crankshaft is jointly affected by the centrifugal force of the rotating mass, the periodically changing gas inertia force, and the reciprocating inertia force, which causes the crankshaft to bear the action of bending and torsional loads. Therefore, the crankshaft is required to have sufficient strength and stiffness, and the journal surface needs to be wear-resistant, work evenly, and have good balance. After the crankshaft is formed, in order to make the size of the crankshaft meet certain precision requirements, the crankshaft needs to be polished.

[0003] In the prior art, there are methods of polishing the crankshaft with abrasive belts or grinding wheels. For example, a Chinese patent document with the patent literature number CN111941172A discloses a grinding machine for synchronous machining of multiple crankshafts. By setting a grinding wheel at the connecting rod journal of the crankshaft, after rotating the crankshaft, the grinding wheel grinds the connecting rod journal of the crankshaft. This polishing method only grinds the connecting rod journal of the crankshaft and cannot grind other parts of the crankshaft, and other polishing processes need to be added, which greatly reduces the production efficiency. Therefore, the present invention proposes a crankshaft polishing device and a polishing method to solve the problems existing in the prior art. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a crankshaft polishing device and a polishing method. The crankshaft polishing device cooperates with a transverse movement component, a longitudinal movement component, and a polishing mechanism, so that different positions of the crankshaft can be polished, greatly increasing the application range of the device. It is a polishing device that does not require adding other polishing processes, and greatly reduces the production cost.

[0005] To achieve the purpose of the present invention, the present invention is realized through the following technical solutions: A crankshaft polishing device includes a housing, a crankshaft, and a polishing mechanism. Adjusting components for clamping and rotating the crankshaft are provided on the inner walls of both sides of the housing, and a moving component for driving the polishing mechanism to move horizontally and vertically is provided on the inner wall of the top of the housing; The polishing mechanism includes a driving part, a polishing part, a fixing sleeve, and a counterweight part. The upper end of the driving part is connected to the moving component, the lower end of the driving part is connected to the polishing part, and two groups of the driving part and the polishing part are symmetrically provided. The two groups of polishing parts are connected by a detachable fixing sleeve, and a counterweight part is also detachably installed on the fixing sleeve; The polishing part includes a mounting seat, locking columns, rotating shafts, fixed shafts, cross bars, vertical bars and a polishing belt. There are two sets of the mounting seats, one above and the other below. The locking columns are fixedly arranged on the end faces of the mounting seats. Fixed shafts are symmetrically installed on the inner sides of the two sets of mounting seats. Rotating shafts are rotatably installed at both ends of the fixed shafts, and the ends of the rotating shafts are rotatably connected to the inner walls of the mounting seats. A driving source for driving the rotating shafts to rotate is provided inside the fixed shafts. There are two sets of the cross bars, and the two sets of cross bars are respectively located between the symmetrically arranged fixed shafts on the left and right. There is one set of the vertical bars, and the vertical bars are located between the symmetrically arranged fixed shafts above and below. A support spring is arranged at the middle end of the vertical bars. The polishing belt is sleeved on the rotating shafts and is driven by the rotating shafts to rotate.

[0006] A further improvement lies in that: a groove is provided on the end face of the locking column, and a clamping groove is provided on the side wall of the locking column.

[0007] A further improvement lies in that: the fixing sleeve includes fixing blocks, connecting springs and first clamping plates. There are two sets of the fixing blocks symmetrically. The two sets of fixing blocks are connected by connecting springs. First clamping plates adapted to the clamping grooves are also provided on the fixing blocks. The central axes of the fixing blocks are aligned with the central axes of the grooves.

[0008] A further improvement lies in that: the counterweight part includes a counterweight ball and a screw rod. A screw rod is fixed on the counterweight ball. A threaded groove is provided at the central position of the fixing block. The counterweight ball is connected to the fixing block through the screw rod cooperating with the threaded groove, and one end of the screw rod is screwed into the groove.

[0009] A further improvement lies in that: the driving part includes a connecting block, a first motor and a clamping seat. The upper end of the connecting block is connected to the moving component. A first motor is fixed to the lower end of the connecting block. The output end of the first motor is fixedly connected to the clamping seat.

[0010] A further improvement lies in that: the clamping seat includes a clamping column, a second clamping plate and an electric push rod. One end of the clamping column is connected to the first motor. A second clamping plate adapted to the clamping groove is fixed to the other end of the clamping column. An electric push rod is also provided at the central position at the lower end of the clamping column. When the output end of the electric push rod extends, it is clamped into the groove.

[0011] A further improvement lies in that: the adjusting component includes a driving seat, a three-jaw chuck and a hydraulic cylinder. There are two sets of the driving seats symmetrically. One end of one set of the driving seats is fixedly connected to the inner wall of one side of the housing. A hydraulic cylinder is provided on the inner wall of the other side of the housing. The output end of the hydraulic cylinder is fixedly connected to the driving seat. A three-jaw chuck is provided inside the driving seat. The crankshaft is clamped between the two sets of three-jaw chucks.

[0012] A further improvement lies in that: the moving component includes a transverse moving component and a longitudinal moving component. The transverse moving component includes a first threaded rod, a guide rod, and a second motor. The first threaded rod is rotatably connected to the inner wall of the housing. A second motor for driving the first threaded rod to rotate is provided on the outer wall of the housing. A guide rod is provided on one side of the first threaded rod.

[0013] A further improvement lies in that: the longitudinal moving component includes a moving seat, a second threaded rod, a third threaded rod, and a third motor. The top of the moving seat is respectively threadedly connected to the first threaded rod and slidably connected to the guide rod. A second threaded rod is rotatably installed on the moving seat. A third threaded rod is provided on one side of the second threaded rod. Two groups of third motors are provided on the outer wall of the moving seat. The two groups of third motors respectively drive the second threaded rod and the third threaded rod to rotate. The second threaded rod and the third threaded rod are respectively threadedly connected to a group of connection blocks. The top of the connection block is slidably connected to the bottom of the moving seat.

[0014] The polishing method of the above crankshaft polishing equipment includes the following steps; S1. Positioning of the crankshaft. One end of the crankshaft is clamped by a three-jaw chuck, and the other end is pushed by a hydraulic cylinder to move the driving seat to the end of the crankshaft, and then clamped by the three-jaw chuck, so as to position crankshafts of different lengths. S2. Determining the polishing mode. The mode for polishing the connecting rod journal is defined as the first mode, the mode for polishing the main journal is defined as the second mode, and the mode for polishing the side wall of the crank is defined as the third mode. S3. Polishing in the first mode. The transverse moving mechanism moves the polishing mechanism to the position of the connecting rod journal. The longitudinal moving mechanism drives the polishing mechanism to move, so that the two polishing parts approach each other, and an angle is formed at the joint between the polishing belt and the connecting rod journal, and the angle should be less than 130°. At the same time, the support springs on the vertical rods are compressed synchronously. Then, the upper and lower ends of the two polishing parts are connected and fixed through the fixing sleeve, and the counterweight part is installed at the same time. Then, the driving part is separated from the polishing part, and then the driving part is moved to both sides through the longitudinal moving mechanism. At this time, the driving seat drives the crankshaft to rotate, and the two polishing parts rotate on the connecting rod journal by centrifugal force, so as to polish the connecting rod journal. To ensure the stable polishing of the connecting rod journal, the rotation speed of the crankshaft should be controlled at 60 r / min. S4. Polishing in the second mode. The transverse moving mechanism moves the polishing mechanism to the position of the main journal. The longitudinal moving mechanism drives the polishing mechanism to move, so that the two polishing parts approach each other, and an angle is formed at the joint between the polishing belt and the connecting rod journal. At the same time, the support springs on the vertical rods are compressed synchronously. Then, the driving seat drives the crankshaft to rotate, so that the polishing belt polishes the entire crankshaft journal while the crankshaft rotates. S5. Polishing in the third mode. The transverse movement mechanism cooperates with the longitudinal movement mechanism to move the polishing mechanism to the position between the two sets of cranks. Then, the driving part drives the polishing part to rotate by 90°. At this time, the polishing belt faces the side wall of the crank. Then, the moving component drives the polishing belt to fit the crank wall. After that, by starting the driving source on the fixed shaft and driving the polishing belt to rotate, the crank wall is polished. When polishing the surface of the crank, only need to adjust the polishing belt to be parallel to the polishing surface and cooperate with the rotation of the crankshaft by the driving seat to polish the surface of the crank.

[0015] The beneficial effects of the present invention are as follows: Through the mutual cooperation of the transverse movement component, the longitudinal movement component and the polishing mechanism, the present invention can polish different positions of the crankshaft, greatly increasing the application range of the device. There is no need to add other polishing equipment for polishing processes, greatly reducing the production cost. At the same time, the structure of the device is simple and compact, further reducing the equipment cost, which is conducive to popularization and use. Brief Description of the Drawings

[0016] Figure 1 is the three-dimensional schematic diagram of the present invention; Figure 2 is the polishing schematic diagram of the present invention in the first mode; Figure 3 is the polishing schematic diagram of the present invention in the second mode; Figure 4 is the polishing schematic diagram of the present invention in the third mode; Figure 5 is the structural schematic diagram of the polishing part of the present invention in the first mode; Figure 6 is the structural schematic diagram of the driving part of the present invention; Figure 7 is the installation schematic diagram of the polishing belt of the present invention; Figure 8 is the support structure schematic diagram of the polishing belt of the present invention; Figure 9 is the structural schematic diagram of the fixed sleeve of the present invention; Figure 10 is the structural schematic diagram of the crankshaft of the present invention.

[0017] Wherein: 1. housing; 2. crankshaft; 3. driving part; 4. polishing part; 5. fixing sleeve; 6. mounting seat; 7. locking column; 8. rotating shaft; 9. fixing shaft; 10. cross bar; 11. vertical bar; 12. polishing belt; 13. support spring; 14. groove; 15. clamping groove; 16. fixing block; 17. connecting spring; 18. first clamping plate; 19. counterweight ball; 20. screw; 21. thread groove; 22. connecting block; 23. first motor; 24. clamping seat; 25. clamping column; 26. second clamping plate; 27. electric push rod; 28. driving seat; 29. three-jaw chuck; 30. hydraulic cylinder; 31. first threaded rod; 32. guide rod; 33. second motor; 34. moving seat; 35. second threaded rod; 36. third threaded rod; 37. third motor. Detailed implementation mode

[0018] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

[0019] According to Figures 1 - 10 As shown, this embodiment proposes a crankshaft polishing device, including a housing 1, a crankshaft 2 and a polishing mechanism. Adjusting components for clamping and rotating the crankshaft 2 are provided on the inner walls of both sides of the housing 1, and a moving component for driving the polishing mechanism to move horizontally and vertically is provided on the inner wall of the top of the housing 1; The polishing mechanism includes a driving part 3, a polishing part 4, a fixing sleeve 5 and a counterweight part. The upper end of the driving part 3 is connected to the moving component, the lower end of the driving part 3 is connected to the polishing part 4. Two groups of the driving part 3 and the polishing part 4 are symmetrically arranged. The two groups of the polishing parts 4 are connected by a detachable fixing sleeve 5, and a counterweight part is detachably installed on the fixing sleeve 5; The driving part is used to adjust the shape of the polishing part. The fixing sleeve 5 is provided for the connection between the two groups of polishing parts, and the design of the counterweight part is used to change the dynamic balance between the upper and lower parts of the two groups of polishing parts. When subjected to centrifugal force, it can rotate accordingly. The polishing part 4 includes a mounting seat 6, a locking post 7, a rotating shaft 8, a fixed shaft 9, a cross bar 10, a vertical bar 11 and a polishing belt 12. There are two sets of the mounting seats 6 arranged up and down. The locking post 7 is fixedly arranged on the end face of the mounting seat 6. Fixed shafts 9 are symmetrically installed on the inner sides of the two sets of mounting seats 6. Rotating shafts 8 are rotatably installed at both ends of the fixed shaft 9. The end of the rotating shaft 8 is rotatably connected to the inner wall of the mounting seat 6. A driving source for driving the rotating shaft 8 to rotate is provided inside the fixed shaft 9. There are two sets of the cross bars 10, and the two sets of cross bars 10 are respectively located between the left and right symmetric fixed shafts 9. There is one set of the vertical bars 11, and the vertical bar 11 is located between the up and down symmetric fixed shafts 9. A support spring 13 is arranged at the middle end of the vertical bar 11. The polishing belt 12 is sleeved on the rotating shaft 8 and is driven by the rotating shaft 8 to rotate.

[0020] By arranging two sets of mounting seats 6 up and down and providing rotating shafts 8 on both the upper and lower sets of mounting seats 6, the polishing belt 12 is supported by the rotating shafts 8. At the same time, the device also sets the fixed shaft 9, which is used for driving the rotating shaft 8 and also cooperates with the cross bar 10 and the vertical bar 11 to further support the rotating shaft 8 and the polishing belt 12. The elastic design of the support spring 13 at the middle end of the vertical bar 11 enables the polishing belt 12 to form an angle with the polishing surface by extrusion during polishing, increasing the contact area. At the same time, to ensure the stable operation of the device, the total elastic potential energy of the support springs 13 on the two polishing parts 4 should be much greater than the overall gravity of the polishing mechanism.

[0021] A groove 14 is provided on the end face of the locking post 7, and a clamping groove 15 is provided on the side wall of the locking post 7.

[0022] The fixing sleeve 5 includes fixing blocks 16, a connecting spring 17 and a first clamping plate 18. There are two sets of the fixing blocks 16 arranged symmetrically. The two sets of fixing blocks 16 are connected by the connecting spring 17. A first clamping plate 18 adapted to the clamping groove 15 is also provided on the fixing block 16. The central axis of the fixing block 16 is aligned with the central axis of the groove 14.

[0023] By stretching the connecting spring 17, the first clamping plate 18 can be inserted into the clamping groove 15, and then the two fixing blocks 16 are pulled by the elastic potential energy of the connecting spring 17 to tightly hold the locking post 7.

[0024] The counterweight part includes a counterweight ball 19 and a screw 20. A screw 20 is fixed on the counterweight ball 19. A threaded groove 21 is provided at the central position of the fixing block 16. The counterweight ball 19 is connected to the fixing block 16 through the screw 20 cooperating with the threaded groove 21, and one end of the screw 20 is screwed into the groove 14.

[0025] When installing the counterweight part, the counterweight ball 19 is screwed into the threaded groove 21 through the screw 20. At the same time, the screwing end of the screw 20 is inserted into the groove 14 to form a limit, further increasing the fixing effect of the fixing sleeve 5.

[0026] The driving part 3 includes a connecting block 22, a first motor 23 and a clamping seat 24. The upper end of the connecting block 22 is connected to the moving component, the lower end of the connecting block 22 is fixed with a first motor 23, and the output end of the first motor 23 is fixedly connected to the clamping seat 24.

[0027] The clamping seat 24 includes a clamping post 25, a second clamping plate 26 and an electric push rod 27. One end of the clamping post 25 is connected to the first motor 23, the other end of the clamping post 25 is fixed with a second clamping plate 26 adapted to the clamping groove 15, and an electric push rod 27 is also provided at the central position of the lower end of the clamping post 25. When the output end of the electric push rod 27 extends, it is clamped into the groove 14.

[0028] Between the clamping seat 24 and the locking post 7, by clamping the second clamping plate 26 into the clamping groove 15 and then starting the electric push rod 27, one end of the electric push rod 27 is inserted into the groove 14 to form a limit, so that the clamping seat 24 and the locking post 7 are tightly connected. Then, the first motor 23 drives the clamping seat 24 to rotate, thereby driving the polishing part 4 to rotate, further adjusting the position of the polishing belt 12, and further performing polishing in different modes.

[0029] The adjusting component includes a driving seat 28, a three-jaw chuck 29 and a hydraulic cylinder 30. There are two sets of driving seats 28 symmetrically arranged. One end of a set of driving seats 28 is fixedly connected to the inner wall of one side of the housing 1, a hydraulic cylinder 30 is provided on the inner wall of the other side of the housing 1, the output end of the hydraulic cylinder 30 is fixedly connected to the driving seat 28, and a three-jaw chuck 29 is arranged inside the driving seat 28. The crankshaft 2 is clamped between the two sets of three-jaw chucks 29.

[0030] By clamping one end of the crankshaft 2 through the three-jaw chuck 29, pushing the driving seat 28 to move to the end of the crankshaft 2 through the hydraulic cylinder 30 at the other end, and then clamping it by the three-jaw chuck 29, the crankshaft 2 of different lengths can be positioned.

[0031] The moving component includes a transverse moving component and a longitudinal moving component. The transverse moving component includes a first threaded rod 31, a guide rod 32 and a second motor 33. The first threaded rod 31 is rotatably connected to the inner wall of the housing 1, the second motor 33 for driving the first threaded rod 31 to rotate is provided on the outer wall of the housing 1, and a guide rod 32 is arranged on one side of the first threaded rod 31.

[0032] The longitudinal movement assembly includes a moving seat 34, a second threaded rod 35, a third threaded rod 36 and a third motor 37. The top of the moving seat 34 is threadedly connected to the first threaded rod 31 and slidably connected to the guide rod 32. The second threaded rod 35 is rotatably installed on the moving seat 34. A third threaded rod 36 is provided on one side of the second threaded rod 35. Two groups of third motors 37 are provided on the outer wall of the moving seat 34. The two groups of third motors 37 respectively drive the second threaded rod 35 and the third threaded rod 36 to rotate. The second threaded rod 35 and the third threaded rod 36 are respectively threadedly connected to a group of connection blocks 22. The top of the connection block 22 is slidably connected to the bottom of the moving seat 34.

[0033] By starting the second motor 33, the second motor 33 drives the first threaded rod 31 to rotate, thereby driving the entire longitudinal movement assembly to move horizontally, and further driving the polishing mechanism installed below the longitudinal movement assembly to move horizontally. By starting the third motor 37, the third motor 37 drives the second threaded rod 35 or the third threaded rod 36 to rotate, thereby adjusting the longitudinal movement of the polishing mechanism. At the same time, the second threaded rod 35 and the third threaded rod 36 are respectively adjusted, so that the polishing part 4 can be adjusted in position as needed, so as to be suitable for different polishing modes.

[0034] The polishing method of the crankshaft polishing equipment includes the following steps; S1. Positioning of the crankshaft 2. One end of the crankshaft 2 is clamped by a three-jaw chuck 29, and the other end is pushed by a hydraulic cylinder 30 to move the driving seat 28 to the end of the crankshaft 2, and then clamped by the three-jaw chuck 29, so as to position the crankshaft 2 of different lengths; S2. Determine the polishing mode. The method for polishing the connecting rod journal is defined as the first mode, the method for polishing the main journal is defined as the second mode, and the method for polishing the side wall of the crank is defined as the third mode; S3. Polishing in the first mode. The transverse movement mechanism moves the polishing mechanism to the connecting rod journal. The longitudinal movement mechanism drives the polishing mechanism to move, so that the two polishing parts 4 approach each other, and an angle is formed at the joint between the polishing belt 12 and the connecting rod journal, and the angle should be less than 130°. At the same time, the support springs 13 on the vertical rods 11 are compressed synchronously. Then, the upper and lower ends of the two polishing parts 4 are connected and fixed by the fixing sleeve 5. At the same time, the counterweight part is installed. Then, the driving part 3 is separated from the polishing part 4. Then, the driving part 3 is moved to both sides by the longitudinal movement mechanism. At this time, the driving seat 28 drives the crankshaft 2 to rotate, and the two polishing parts 4 rotate on the connecting rod journal by centrifugal force, so as to polish the connecting rod journal. To ensure the stable polishing of the connecting rod journal, the rotation speed of the crankshaft 2 should be controlled at 60 r / min; S4. Polishing in the second mode: The traversing mechanism moves the polishing mechanism to the main journal. The longitudinal movement mechanism drives the polishing mechanism to move, causing the two polishing parts 4 to approach each other, forming an angle at the joint between the polishing belt 12 and the connecting rod journal. At the same time, the support spring 13 on the vertical rod 11 is compressed synchronously. Then, the driving seat 28 drives the crankshaft 2 to rotate, so that the polishing belt 12 grinds the entire crankshaft journal while the crankshaft 2 rotates. S5. Polishing in the third mode: The traversing mechanism cooperates with the longitudinal movement mechanism to move the polishing mechanism to the position between the two cranks. Then, the driving part 3 drives the polishing part 4 to rotate 90°. At this time, the polishing belt 12 faces the side wall of the crank. Then, the moving assembly drives the polishing belt 12 to fit with the crank wall. After that, by starting the driving source on the fixed shaft 9 and driving the polishing belt 12 to rotate, the crank wall can be ground. When grinding the surface of the crank, only need to adjust the polishing belt 12 to be parallel to the grinding surface, and then cooperate with the rotation of the crankshaft 2 by the driving seat 28, so that the surface of the crank can be ground.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crankshaft polishing device, comprising a housing (1), a crankshaft (2) and a polishing mechanism, characterized in that: On both inner walls of the housing (1), there are adjusting components for clamping and rotating the crankshaft (2), and on the inner wall of the top of the housing (1), there is a moving component for driving the polishing mechanism to move horizontally and vertically; The polishing mechanism includes a driving part (3), a polishing part (4), a fixing sleeve (5) and a counterweight part. The upper end of the driving part (3) is connected to the moving component, the lower end of the driving part (3) is connected to the polishing part (4), and two groups of the driving part (3) and the polishing part (4) are symmetrically arranged. The two groups of the polishing parts (4) are connected by a detachable fixing sleeve (5), and a counterweight part is detachably installed on the fixing sleeve (5); The polishing part (4) includes a mounting seat (6), a locking column (7), a rotating shaft (8), a fixing shaft (9), a cross bar (10), a vertical bar (11) and a polishing belt (12). There are two groups of the mounting seats (6) arranged up and down. The locking column (7) is fixedly arranged on the end face of the mounting seat (6). On the inner sides of the two groups of the mounting seats (6), fixing shafts (9) are symmetrically installed. At both ends of the fixing shaft (9), rotating shafts (8) are rotatably installed. The end of the rotating shaft (8) is rotatably connected to the inner wall of the mounting seat (6). A driving source for driving the rotating shaft (8) to rotate is arranged in the fixing shaft (9). There are two groups of the cross bars (10), and the two groups of the cross bars (10) are respectively located between the left and right symmetric fixing shafts (9). There is one group of the vertical bars (11), and the vertical bar (11) is located between the up and down symmetric fixing shafts (9). A support spring (13) is arranged at the middle end of the vertical bar (11). The polishing belt (12) is sleeved on the rotating shaft (8) and is driven by the rotating shaft (8) to rotate.

2. The crankshaft polishing equipment according to claim 1, characterized in that: The end face of the locking column (7) is provided with a groove (14), and the side wall of the locking column (7) is provided with a clamping groove (15).

3. A crankshaft polishing device according to claim 2, characterized in that: The fixing sleeve (5) includes fixing blocks (16), connecting springs (17) and first clamping plates (18). There are two groups of the fixing blocks (16) arranged symmetrically. The two groups of the fixing blocks (16) are connected by the connecting springs (17). The fixing blocks (16) are also provided with first clamping plates (18) adapted to the clamping grooves (15). The central axis of the fixing block (16) is aligned with the central axis of the groove (14).

4. The crankshaft polishing equipment according to claim 3, characterized in that: The counterweight part includes a counterweight ball (19) and a screw rod (20). A screw rod (20) is fixed on the counterweight ball (19). A threaded groove (21) is arranged at the central position of the fixing block (16). The counterweight ball (19) is connected to the fixing block (16) through the screw rod (20) cooperating with the threaded groove (21), and one end of the screw rod (20) is screwed into the groove (14).

5. The crankshaft polishing equipment according to claim 2, characterized in that: The driving part (3) includes a connecting block (22), a first motor (23) and a clamping seat (24). The upper end of the connecting block (22) is connected to the moving component, the lower end of the connecting block (22) is fixed with a first motor (23), and the output end of the first motor (23) is fixedly connected to the clamping seat (24).

6. The crankshaft polishing equipment according to claim 5, characterized in that: The clamping seat (24) includes a clamping post (25), a second clamping plate (26) and an electric push rod (27). One end of the clamping post (25) is connected to the first motor (23), and a second clamping plate (26) adapted to the card slot (15) is fixed at the other end of the clamping post (25). An electric push rod (27) is also provided at the central position of the lower end of the clamping post (25), and when the output end of the electric push rod (27) extends, it is clamped into the groove (14).

7. A crankshaft polishing device according to claim 1, characterized in that: The adjusting assembly includes a driving seat (28), a three-jaw chuck (29) and a hydraulic cylinder (30). There are two sets of the driving seats (28) symmetrically arranged. One end of one set of the driving seats (28) is fixedly connected to the inner wall of one side of the housing (1), and a hydraulic cylinder (30) is provided on the inner wall of the other side of the housing (1). The output end of the hydraulic cylinder (30) is fixedly connected to the driving seat (28). A three-jaw chuck (29) is provided inside the driving seat (28), and the crankshaft (2) is clamped between the two sets of three-jaw chucks (29).

8. A crankshaft polishing device according to claim 1, characterized in that: The moving assembly includes a transverse moving assembly and a longitudinal moving assembly. The transverse moving assembly includes a first threaded rod (31), a guide rod (32) and a second motor (33). The first threaded rod (31) is rotatably connected to the inner wall of the housing (1), and a second motor (33) for driving the first threaded rod (31) to rotate is provided on the outer wall of the housing (1). A guide rod (32) is provided on one side of the first threaded rod (31).

9. A crankshaft polishing device according to claim 1, characterized in that: The longitudinal moving assembly includes a moving seat (34), a second threaded rod (35), a third threaded rod (36) and a third motor (37). The top of the moving seat (34) is threadedly connected to the first threaded rod (31) and slidably connected to the guide rod (32). A second threaded rod (35) is rotatably installed on the moving seat (34), a third threaded rod (36) is provided on one side of the second threaded rod (35), and two sets of third motors (37) are provided on the outer wall of the moving seat (34). The two sets of third motors (37) drive the second threaded rod (35) and the third threaded rod (36) to rotate respectively. The second threaded rod (35) and the third threaded rod (36) are threadedly connected to a set of connecting blocks (22) respectively, and the top of the connecting block (22) is slidably connected to the bottom of the moving seat (34).

10. A polishing method for a crankshaft polishing device according to claims 1-9, characterized in that: Including the following steps; S1. Positioning of the crankshaft (2). One end of the crankshaft (2) is clamped by the three-jaw chuck (29), and the other end is pushed by the hydraulic cylinder (30) to move the driving seat (28) to the end of the crankshaft (2), and then clamped by the three-jaw chuck (29), so as to position the crankshaft (2) of different lengths. S2. Determining the polishing mode. The mode for polishing the connecting rod journal is defined as the first mode, the mode for polishing the main journal is defined as the second mode, and the mode for polishing the side wall of the crank is defined as the third mode. S3. Polishing in the first mode: The transverse movement mechanism moves the polishing mechanism to the crankpin. The longitudinal movement mechanism drives the polishing mechanism to move, causing the two polishing parts (4) to approach each other, forming an angle at the contact between the polishing belt (12) and the crankpin, and the angle should be less than 130°. At the same time, the support springs (13) on the vertical rods (11) are compressed synchronously. Then, the upper and lower ends of the two polishing parts (4) are connected and fixed through the fixing sleeve (5). Meanwhile, the counterweight part is installed. Then, the driving part (3) is separated from the polishing part (4). Then, the driving part (3) is moved to both sides through the longitudinal movement mechanism. At this time, the driving seat (28) drives the crankshaft (2) to rotate, and the two polishing parts (4) rotate on the crankpin by centrifugal force, thereby grinding the crankpin. To ensure the stable grinding of the crankpin, the rotation speed of the crankshaft (2) should be controlled at 60 r / min; S4. Polishing in the second mode: The transverse movement mechanism moves the polishing mechanism to the main journal. The longitudinal movement mechanism drives the polishing mechanism to move, causing the two polishing parts (4) to approach each other, forming an angle at the contact between the polishing belt (12) and the crankpin. At the same time, the support springs (13) on the vertical rods (11) are compressed synchronously. Then, the driving seat (28) drives the crankshaft (2) to rotate, and the polishing belt (12) grinds the entire crankshaft journal while the crankshaft (2) rotates; S5. Polishing in the third mode: The transverse movement mechanism cooperates with the longitudinal movement mechanism to move the polishing mechanism to the position between the two cranks. Then, the driving part (3) drives the polishing part (4) to rotate 90°. At this time, the polishing belt (12) faces the side wall of the crank. Then, the moving component is used to make the polishing belt (12) fit with the crank wall. Then, by starting the driving source on the fixed shaft (9), driving the polishing belt (12) to rotate, thereby grinding the crank wall. When grinding the surface of the crank, only need to adjust the polishing belt (12) to be parallel to the grinding surface, and then cooperate with the driving seat (28) to rotate the crankshaft (2), thereby grinding the surface of the crank.

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