High-precision crankshaft cylindrical grinder

Abstract

The application relates to the field of workpiece polishing processing, in particular to a high-precision crankshaft outer circle grinding machine which comprises a bed body, a clamping main shaft arranged on the bed body and used for clamping one end of a crankshaft, a grinding main body arranged on the bed body and used for grinding the outer circle of one end of the crankshaft fixed by the clamping main shaft, the bed body is provided with a clamping auxiliary shaft used for fixing the one end of the crankshaft after polishing, the bed body is provided with a grinding auxiliary body used for grinding the outer circle of the crankshaft fixed by the clamping auxiliary shaft, the circular rotation track formed by the rotation of the one end of the crankshaft clamped by the clamping main shaft around the rotation axis of the clamping main shaft is a rotation circle, the axial direction of the clamping auxiliary shaft is consistent with the axial direction of the clamping main shaft, and a straight line where the rotation shaft of the clamping auxiliary shaft is located passes through the rotation circle, so that after the one end of the crankshaft clamped by the clamping main shaft is polished, the clamping main shaft and the clamping auxiliary shaft rotate to the designated positions of the clamping main shaft and the clamping auxiliary shaft respectively, the clamping auxiliary shaft can clamp the workpiece clamped by the clamping main shaft, and the two ends of the crankshaft can be polished.

Description

Technical Field

[0001] This application relates to the field of workpiece grinding and machining, and in particular to a high-precision crankshaft cylindrical grinding machine. Background Technology

[0002] A small crankshaft is used in refrigerator compressors. Due to the small size of the crankshaft and the high precision requirements of its operating conditions, the precision requirements for grinding the outer diameter of the crankshaft are also high.

[0003] To achieve high-precision grinding of crankshafts, CNC grinding machines are required for external cylindrical grinding. For example, the CNC crankshaft crank external cylindrical grinding machine with announcement number CN201214201Y has one end of the crankshaft clamped in an eccentric fixture on the spindle, causing the crankshaft to rotate around the axis of the end to be machined. At the same time, the spindle can move along its own axial direction. A grinding wheel head that can move radially along the spindle is installed on the machine bed. The grinding wheel head drives the grinding wheel to move toward the outer circle of one end of the crankshaft to achieve external cylindrical grinding.

[0004] Regarding the aforementioned technologies, since both ends of the crankshaft need to be ground and the two ends of the crankshaft are eccentrically set, after one end is ground, the crankshaft needs to be removed and placed on another grinding machine to grind the other end, which makes the crankshaft processing very inconvenient. Summary of the Invention

[0005] To facilitate the grinding of both ends of the crankshaft, this application provides a high-precision crankshaft external cylindrical grinding machine.

[0006] The high-precision crankshaft external cylindrical grinding machine provided in this application adopts the following technical solution.

[0007] A high-precision crankshaft cylindrical grinding machine includes a bed, a clamping spindle mounted on the bed and clamping one end of the crankshaft, and a grinding body mounted on the bed and capable of grinding the outer diameter of the crankshaft end fixed by the clamping spindle. The bed is provided with a clamping sub-spindle that fixes the ground end of the crankshaft, and the bed is provided with a grinding sub-body that grinds the outer diameter of the crankshaft fixed by the clamping sub-spindle. The circular rotation trajectory formed by the crankshaft end clamped by the clamping spindle rotating around the rotation axis of the clamping spindle is called a rotation circle. The axial direction of the clamping sub-spindle is consistent with the axial direction of the clamping spindle, and the straight line of the rotation axis of the clamping sub-spindle passes through the rotation circle.

[0008] By adopting the above technical solution, after grinding one end of the crankshaft, the clamping subshaft is rotated to a predetermined position, so that the axis of the clamping main shaft is aligned with the position where the clamping subshaft is used to clamp the crankshaft. Then the clamping main shaft and the clamping subshaft move closer together, so that the crankshaft is transferred to the clamping subshaft. Then the grinding sub-body grinds the remaining end of the crankshaft, so that the grinding operation at both ends of the crankshaft can be completed relatively quickly, improving the overall grinding efficiency of the crankshaft.

[0009] Optionally, the clamping sub-shaft and the clamping main shaft are each provided with a measuring hole at a position away from the position where the crankshaft is clamped. The bed is provided with a detection frame, which is provided with two ranging elements that can emit light beams and are applied one to one to detect the position of the measuring hole of the clamping sub-shaft and the clamping main shaft.

[0010] By adopting the above technical solution, the clamping sub-shaft and the clamping main shaft can each rotate no more than one revolution, so that the clamping sub-shaft and the clamping main shaft can complete the alignment adjustment more quickly.

[0011] Optionally, the measuring hole is inclined, and the opening of the measuring hole at the end face of the clamping spindle or clamping sub-spindle is far away from the axis of the corresponding clamping spindle or clamping sub-spindle.

[0012] By adopting the above technical solution, even if cutting fluid enters the measuring hole during grinding, the cutting fluid in the measuring hole will be thrown out due to the rotation of the clamping spindle or clamping sub-spindle, making it difficult for a large amount of cutting fluid to remain in the measuring hole, and making the detection of the measuring hole by the measuring component less affected.

[0013] Optionally, a protrusion that can be partially exposed outside the measuring hole is slidably connected inside the measuring hole along its own axis. The protrusion is fixedly connected to a spring block that is slidably connected inside the clamping sub-shaft or clamping main shaft. The spring block abuts against a push-in spring that forces the protrusion into the measuring hole. The clamping main shaft or clamping sub-shaft is detachably connected to a mounting block for the push-in spring to abut against at the periphery of the measuring hole.

[0014] By adopting the above technical solution, when the main shaft or the secondary shaft is clamped and rotated, the protruding part will be exposed outside the measuring hole, making it difficult for the cutting fluid during grinding to enter the measuring hole, so as to keep the inner wall of the measuring hole dry and further improve the accuracy of the measuring component in detecting the position of the measuring hole.

[0015] Optionally, the bed is provided with a loading and conveying section for conveying the crankshaft to be polished to the clamping spindle. Several positioning fixtures for placing the crankshaft are fixedly connected to the conveying surface of the loading and conveying section. The loading and conveying section is provided with a loading and transfer mechanism for transferring the crankshaft in the positioning fixture to the clamping spindle for fixing.

[0016] By adopting the above technical solution, the crankshaft can be transported in a certain posture on the positioning fixture, so that the crankshaft can be fed quickly and stably, which helps to improve the efficiency of crankshaft grinding.

[0017] Optionally, the feeding and transfer mechanism includes a material rack located on the side of the feeding and transfer section, a rotating block rotatably connected to the material rack, a rotary cylinder located on the material rack and driving the rotating block to rotate, an extension cylinder located on the rotating block, and a pneumatic finger located on the power rod of the extension cylinder and clamping the crankshaft.

[0018] By adopting the above technical solution, the crankshaft can be clamped and driven to the clamping spindle for clamping and fixing.

[0019] Optionally, the bed is provided with a material transfer mechanism for removing the crankshaft held by the clamping sub-shaft. The bed is provided with a material transfer section on the upper part of the inclined surface to receive the crankshaft removed by the material transfer mechanism. A material box for receiving the polished crankshaft is provided directly below the lowest point of the inclined surface of the material transfer section.

[0020] By adopting the above technical solution, the crankshaft that has been polished at both ends can be removed and fed into the material box via the feeding chute, so as to facilitate the collection of the finally polished crankshaft, and the crankshaft is not easily damaged by large impacts.

[0021] Optionally, baffles are fixedly connected to both inclined sides of the feed slope, and pulleys are rotatably connected to both ends of the baffles. The baffles are equipped with pulley motors that rotate the pulleys. A synchronous belt is connected between the two pulleys, and a pusher plate that can move close to the inclined surface of the feed slope is fixedly connected to the synchronous belt.

[0022] By adopting the above technical solution, when the crankshaft stops moving on the unloading slope and cannot fall smoothly, the baffle can drive the crankshaft to move downward, so that the crankshaft is less likely to be pushed and accumulated on the unloading slope.

[0023] Optionally, the synchronous belt always drives in one direction, and the distance between the pusher plate and the feeding slope when the pusher plate moves from bottom to top along the inclined direction of the feeding slope is greater than the maximum distance between the crankshaft and the feeding slope when the crankshaft is located on the inclined surface of the feeding slope.

[0024] By adopting the above technical solution, when the pusher plate moves from the low point to the high point of the discharge slope, even if there is a crankshaft on the discharge slope at this time, the pusher plate will not push the crankshaft to move upward. Furthermore, when the pusher plate moves to the side of the slope away from the timing belt, the pusher plate can stop moving until there is a certain amount of crankshaft on the discharge slope, and then the pusher plate moves again.

[0025] Optionally, the lowest point of the inclined surface of the feeding ramp is lower than the height of the pulley with the lowest height, so that the pusher plate can move close to the lower side of the inclined surface of the feeding ramp.

[0026] By adopting the above technical solution, the pusher plate can smoothly push the crankshaft that is stuck at the bottom of the inclined surface of the unloading slope.

[0027] In summary, this application includes at least one of the following beneficial effects:

[0028] 1. To complete the grinding operation at both ends of the crankshaft more quickly, thereby improving the overall grinding efficiency of the crankshaft;

[0029] 2. The crankshaft can be loaded and unloaded automatically, reducing labor costs and improving overall grinding efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the main structure of this application;

[0031] Figure 2 This is a partial cross-sectional view of the end of the main spindle where the measuring hole is located.

[0032] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0033] Figure 4 This is a structural diagram of the inclined section for material feeding.

[0034] Explanation of reference numerals in the attached drawings: 1. Bed; 2. Clamping spindle; 3. Grinding body; 31. Material box; 32. Baffle; 33. Pulley; 34. Synchronous belt; 35. Push plate; 36. Pulley motor; 37. Side guide; 4. Clamping sub-spindle; 41. Positioning fixture; 42. Loading and transferring mechanism; 43. Material rack; 44. Rotary block; 45. Rotary cylinder; 46. Extending cylinder; 47. Pneumatic finger; 48. Unloading and transferring mechanism; 49. Unloading inclined section; 5. Grinding sub-body; 51. Rotary ring; 52. Measuring hole; 53. Detection frame; 54. Distance measuring component; 55. Protrusion block; 56. Spring block; 57. Push-in spring; 58. Mounting block; 59. Loading and conveying section. Detailed Implementation

[0035] The present application will be further described in detail below with reference to the accompanying drawings.

[0036] This application discloses a high-precision crankshaft cylindrical grinding machine, referring to... Figure 1 The machine includes a horizontally positioned bed 1 placed on the ground. A clamping spindle 2 and a clamping sub-spindle 4 are mounted directly above the bed 1. Both the clamping spindle 2 and the clamping sub-spindle 4 are equipped with eccentric clamps to hold one end of the workpiece. The clamping spindle 2 and the clamping sub-spindle 4 each move via a corresponding spindle box. The axes of the clamping spindle 2 and the clamping sub-spindle 4 are in the same direction and both move along their own axial direction. The bed 1 is equipped with a grinding body 3 and a grinding sub-body 5 that can move horizontally radially along the clamping spindle 2. The grinding body 3 performs outer diameter grinding on one end of the crankshaft held by the clamping spindle 2. Then, the clamping sub-spindle 4 clamps the crankshaft end that has been ground at one end, allowing the grinding sub-body 5 to grind the remaining end of the crankshaft held by the clamping sub-spindle 4, thus completing the grinding of both ends of the crankshaft.

[0037] Reference Figure 1A feeding conveyor 59 is placed on the ground on one side of the bed 1. The feeding conveyor 59 can be a belt conveyor. Several positioning fixtures 41 are evenly fixedly connected to the conveying surface of the feeding conveyor 59 along its own conveying direction. Each positioning fixture 41 is used to place a crankshaft in a predetermined posture, and the end of the crankshaft that is being polished by the polishing body 3 is exposed outside the positioning fixture 41 so that the crankshaft can be easily clamped. The feeding and transfer unit 59 is provided with a feeding and transfer mechanism 42 for transferring the crankshaft in the positioning fixture 41 to the clamping spindle 2 for fixing. The feeding and transfer mechanism 42 includes a material rack 43 detachably connected to one end of the frame of the feeding and transfer unit 59 near the clamping spindle 2. A rotating block 44 is rotatably connected to the upper end of the material rack 43. The rotation axis of the rotating block 44 is aligned with the axis of the clamping spindle 2. A rotary cylinder 45 with an output shaft coaxially fixed to the rotating block 44 is fixedly connected to the material rack 43. An extension cylinder 46, which is a linear cylinder, is detachably connected to the rotating block 44. A pneumatic finger 47 is detachably connected to the end of the power rod of the extension cylinder 46.

[0038] After the pneumatic finger 47 clamps one end of the crankshaft in the positioning fixture 41, the extension cylinder 46 drives the pneumatic finger 47 to move upward. Then, the rotating cylinder 45 drives the rotating block 44 to rotate 90°, so that the extension cylinder 46 changes from vertical to horizontal. Then, the power rod of the extension cylinder 46 extends, so that the end of the crankshaft clamped by the pneumatic finger 47 moves to a position coaxial with the axis of the clamping spindle 2. Then, the clamping spindle 2 moves along its own axis to clamp and fix the crankshaft.

[0039] Reference Figure 1 The bed 1 is detachably connected to a vertically oriented detection frame 53. The detection frame 53 is detachably connected to a ranging element 54. The ranging element 54 can be a laser ranging sensor that emits a laser beam for distance detection. The end face of the clamping spindle 2 facing the ranging element 54 has a positioning hole 52. The positioning hole 52 is away from the position where the eccentric clamp is set on the clamping spindle 2. When the ranging element 54 is directly opposite the positioning hole 52, the distance value detected by the ranging element 54 increases. When the external controller receives the signal input from the ranging element 54, it can know that the eccentric clamp used for crankshaft clamping on the clamping spindle 2 is directly opposite the end of the crankshaft clamped by the pneumatic finger 47 away from the pneumatic finger 47. At this time, the clamping spindle 2 stops rotating and moves toward the crankshaft to successfully clamp the crankshaft.

[0040] Reference Figure 1A measuring hole 52 is also provided at the location of the clamping sub-shaft 4 away from the position where the eccentric fixture is set. The detection frame 53 is equipped with two measuring elements 54, which correspond one-to-one with the measuring holes 52 of the clamping main shaft 2 and the clamping sub-shaft 4 to detect the position. The axis of the clamping sub-shaft 4 and the axis of the clamping main shaft 2 are located in the same vertical plane. The height of the axis of the clamping sub-shaft 4 is lower than the height of the axis of the clamping main shaft 2. The circular trajectory formed by the rotation of the clamping main shaft 2 around the axis of the clamping main shaft 2 at the position where the eccentric fixture is set is called a rotation circle 51. The axis of the clamping sub-shaft 4 passes through the lowest point of the rotation circle 51. After the grinding body 3 finishes grinding one end of the crankshaft, the clamping subshaft 4 rotates until its measuring hole 52 is at its lowest point and its eccentric clamp is at its highest point. At this point, the eccentric clamp of the clamping subshaft 4 is directly opposite the end of the crankshaft that has been ground. Then, the clamping main shaft 2 and the clamping subshaft 4 move closer together so that the ground end of the crankshaft is held by the clamping subshaft 4, allowing the subsequent grinding body 5 to grind the end of the crankshaft away from the clamping subshaft 4. Furthermore, the crankshaft can smoothly pass between the two measuring elements 54.

[0041] Reference Figure 2 and Figure 3 Since the measuring holes 52 for clamping the main spindle 2 and the secondary spindle 4 are identical, the measuring hole 52 for clamping the main spindle 2 will be used as an example for explanation. The measuring hole 52 is inclined, and the end of the measuring hole 52 near the measuring member 54 is away from the axis of the clamping main spindle 2. A protrusion 55 is slidably connected to the inner wall of the measuring hole 52 along its own axis. A spring block 56 is fixedly connected to the end of the protrusion 55 located inside the measuring hole 52. A side channel 37 is opened on the end face of the clamping main spindle 2 where the measuring hole 52 is opened, which is connected to the measuring hole 52. The length direction of the side channel 37 is consistent with the length direction of the measuring hole 52. The spring block 56 is slidably connected to the inner wall of the side channel 37 along the length direction of the side channel 37. The spring block 56 abuts against a push-in spring 57. A mounting block 58 is detachably connected to the opening of the side channel 37 for the end of the push-in spring 57 away from the spring block 56 to abut against.

[0042] Pushing in the spring 57 causes the spring block 56 to move toward the inside of the clamping spindle 2, so that the protrusion 55 tends to be located inside the measuring hole 52. At this time, the protrusion 55 will not affect the position of the measuring element 54 in detecting the measuring hole 52. When the clamping spindle 2 rotates at high speed to grind the crankshaft, the protrusion 55 is exposed to the measuring hole 52 by centrifugal force, making it difficult for the cutting fluid to enter the measuring hole 52. This reduces the impact on the measuring element 54 when aligning the point furthest from the measuring element 54 on the inclined circumferential outer wall of the measuring hole 52.

[0043] Reference Figure 1After the grinding sub-body 5 has finished grinding, the clamping sub-shaft 4 rotates again until its measuring hole 52 is at its lowest point and its eccentric clamp is at its highest point. The bed 1 is equipped with a unloading transfer mechanism 48 with the same structure as the loading transfer mechanism 42. The unloading transfer mechanism 48 is used to remove the crankshaft clamped on the clamping sub-shaft 4. The bed 1 is fixedly connected to the unloading inclined section 49 at the position opposite to the unloading transfer mechanism 48. The upper end of the inclined surface of the unloading inclined section 49 is used to place the crankshaft clamped by the unloading transfer mechanism 48. Baffles 32 are fixedly connected to both inclined sides of the inclined surface of the unloading inclined section 49. The length direction of the baffles 32 is consistent with the inclination direction of the inclined surface of the unloading inclined section 49. The material box 31 is placed on the ground directly below the lowest point of the inclined surface of the unloading inclined section 49.

[0044] Reference Figure 4 A pulley 33 is rotatably connected to both ends of a baffle 32. A synchronous belt 34 is connected between the two pulleys 33. The length direction of the synchronous belt 34 is consistent with the length direction of the baffle 32. A pulley motor 36 with an output shaft coaxially connected to the bottom of the baffle 32 is fixedly connected to the pulley 33. A pusher plate 35 is fixedly connected to one side of the synchronous belt 34. The end of the pusher plate 35 away from the synchronous belt 34 is close to the baffle 32 away from the synchronous belt 34. When the pusher plate 35 is located on the side of the synchronous belt 34 with a lower height, the bottom surface of the pusher plate 35 is close to the inclined surface of the unloading slope 49. When the pusher plate 35 is located on the side of the synchronous belt 34 with a higher height, the crankshaft can pass smoothly between the bottom surface of the pusher plate 35 and the inclined surface of the unloading slope 49, so that the synchronous belt 34 can transmit in the same direction and is less likely to affect the fall of the crankshaft. The height of the pulley 33 is lower than the height of the lowest point of the inclined surface of the unloading slope 49, so that the pusher plate 35 can move past the lowest point of the inclined surface of the unloading slope 49, so that the crankshaft can be smoothly pushed into the material box 31 by the pusher plate 35.

[0045] The implementation principle of a high-precision crankshaft cylindrical grinding machine according to an embodiment of this application is as follows: The crankshaft is placed in the positioning fixture 41 and transported to the loading transfer mechanism 42 by the loading transfer unit 59. The loading transfer mechanism 42 clamps and sends it to the position directly opposite the clamping spindle 2. Then, the clamping spindle 2 rotates until its eccentric fixture is aligned with the unclamped end of the crankshaft. Then, the clamping spindle 2 moves along its own axial direction so that the clamping spindle 2 can clamp the workpiece. Then, the grinding body 3 grinds the outer diameter of one end of the crankshaft. After the grinding is completed, the clamping sub-shaft 4 rotates until its eccentric fixture is aligned with the ground end of the crankshaft. Then, the clamping sub-shaft 4 and the clamping spindle 2 move closer together so that the clamping sub-shaft 4 clamps the ground end of the crankshaft. At this time, the grinding sub-body 5 can grind the remaining end of the crankshaft. At the same time, the loading transfer mechanism 42 can send a new crankshaft to the clamping spindle 2 so that the grinding of the two crankshafts can be performed simultaneously.

[0046] After the grinding sub-body 5 is finished grinding, the clamping sub-shaft 4 is rotated and adjusted so that its own eccentric clamp is aligned with the axis of the clamping main shaft 2. Then the unloading transfer mechanism 48 removes the crankshaft clamped by the clamping sub-shaft 4 and places it at the upper end of the inclined surface of the unloading slope 49, so that the crankshaft with both ends ground falls into the material box 31 along the inclined surface of the unloading slope 49.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-precision crankshaft external cylindrical grinding machine, comprising a bed (1), a clamping spindle (2) disposed on the bed (1) and clamping one end of the crankshaft, and a grinding body (3) disposed on the bed (1) and capable of grinding the outer diameter of one end of the crankshaft fixed by the clamping spindle (2), characterized in that: The bed (1) is provided with a clamping sub-shaft (4) for fixing one end of the crankshaft after grinding, and the bed (1) is provided with a grinding sub-body (5) for grinding the outer circle of the crankshaft fixed by the clamping sub-shaft (4). The circular rotation trajectory formed by the crankshaft one end clamped by the clamping main shaft (2) rotating around the rotation axis of the clamping main shaft (2) is a circle (51). The axial direction of the clamping sub-shaft (4) is consistent with the axial direction of the clamping main shaft (2), and the straight line where the rotation axis of the clamping sub-shaft (4) is located passes through the circle (51). The clamping sub-shaft (4) and the clamping main shaft (2) are each provided with a measuring hole (52) at a position away from the position where the crankshaft is clamped. The bed (1) is provided with a detection frame (53). The detection frame (53) is provided with two distance measuring elements (54) that can emit light beams and are applied one to one to detect the position of the measuring hole (52) of the clamping sub-shaft (4) and the clamping main shaft (2). The measuring hole (52) is inclined, and the opening of the measuring hole (52) at the end face of the clamping main shaft (2) or the clamping secondary shaft (4) is far away from the axis of the corresponding clamping main shaft (2) or clamping secondary shaft (4); The measuring hole (52) has a protrusion (55) that is partially exposed in the measuring hole (52) along its own axis. The protrusion (55) is fixedly connected to a spring block (56) that is slidably connected to the clamping sub-shaft (4) or the clamping main shaft (2). The spring block (56) abuts against a push spring (57) that forces the protrusion (55) to retract into the measuring hole (52). The clamping main shaft (2) or the clamping sub-shaft (4) is detachably connected to a mounting block (58) for the push spring (57) to abut against at the periphery of the measuring hole (52).

2. The high-precision crankshaft external cylindrical grinding machine according to claim 1, characterized in that: The bed (1) is provided with a loading and conveying section (59) for conveying the crankshaft to be polished to the clamping spindle (2). Several positioning fixtures (41) for placing the crankshaft are fixedly connected to the conveying surface of the loading and conveying section (59). The loading and conveying section (59) is provided with a loading and transfer mechanism (42) for transferring the crankshaft in the positioning fixture (41) to the clamping spindle (2) for fixing.

3. A high-precision crankshaft external cylindrical grinding machine according to claim 2, characterized in that: The loading and transfer mechanism (42) includes a material rack (43) located on the side of the loading and transfer section (59), a rotating block (44) rotatably connected to the material rack (43), a rotary cylinder (45) located on the material rack (43) and driving the rotating block (44) to rotate, an extension cylinder (46) located on the rotating block (44), and a pneumatic finger (47) located on the power rod of the extension cylinder (46) and clamping the crankshaft.

4. A high-precision crankshaft external cylindrical grinding machine according to claim 2, characterized in that: The bed (1) is provided with a material transfer mechanism (48) for removing the crankshaft held by the clamping sub-shaft (4). The bed (1) is provided with a material transfer section (49) on the upper part of the inclined surface to receive the crankshaft removed by the material transfer mechanism (48). A material box (31) for receiving the polished crankshaft is provided directly below the lowest point of the inclined surface of the material transfer section (49).

5. A high-precision crankshaft external cylindrical grinding machine according to claim 4, characterized in that: The feeding slope (49) is fixedly connected to two inclined sides of the slope with baffles (32). Both ends of the baffles (32) are rotatably connected to pulleys (33). The baffles (32) are equipped with pulley motors (36) that make the pulleys (33) rotate. The two pulleys (33) are connected by a synchronous belt (34). The synchronous belt (34) is fixedly connected to a pusher plate (35) that can move close to the inclined surface of the feeding slope (49).

6. A high-precision crankshaft external cylindrical grinding machine according to claim 5, characterized in that: The synchronous belt (34) always drives in one direction. When the pusher plate (35) moves from bottom to top along the inclined direction of the feeding slope (49), the distance between it and the feeding slope (49) is greater than the maximum distance between the crankshaft and the feeding slope (49) when the crankshaft is located on the inclined surface of the feeding slope (49).

7. A high-precision crankshaft external cylindrical grinding machine according to claim 5, characterized in that: The lowest point of the inclined surface of the feeding slope (49) is lower than the height of the low-height pulley (33) so that the pusher plate (35) can move close to the lower side of the inclined surface of the feeding slope (49).

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