A crankshaft processing production line

Abstract

The present application relates to the field of workpiece processing equipment, and particularly to a crankshaft processing production line, which includes several front processing centers arranged in a row for performing the same processing on workpieces, several rear processing centers arranged in a row for performing the same processing on workpieces and performing processing not carried out by the front processing centers, two long rails respectively provided above the front processing centers and above the rear processing centers, a front robotic arm slidably connected to the long rail near the front processing center and capable of clamping and moving the workpiece, a rear robotic arm slidably connected to the long rail near the rear processing center and capable of clamping and moving the workpiece, a loading table near the front processing center, a loading member driven by the receiving table and for positioning and placing the long shaft and the short shaft, a clamping jaw cylinder for clamping and moving the workpiece placed in the loading member, a positioning seat for receiving the workpiece clamped by the clamping jaw cylinder, and a positioning abutting block for forcing the middle piece to abut tightly against the positioning seat. The front robotic arm clamps the workpiece on the positioning seat to reduce the impact on the processing quality.

Description

Technical Field

[0001] This application relates to the field of workpiece processing equipment, and particularly to a crankshaft processing production line. Background Art

[0002] The crankshaft workpiece needs to be subjected to related operations such as milling, drilling, and grinding. For this purpose, the crankshaft workpiece needs to be placed in a numerical control machining center for processing by multiple tool heads. For example, for an existing crankshaft workpiece, refer to Figure 6 , which includes a long shaft 11. One end of the long shaft 11 is fixedly connected to a middle piece 12. A short shaft 13 is fixedly connected to the side of the middle piece 12 facing away from the long shaft 11. The short shaft 13 and the long shaft 11 have the same axial direction and are offset.

[0003] For an existing automated crankshaft production line loading and unloading transportation line with the publication number CN109352426A, the workpiece is driven by a robotic arm capable of translating and vertically moving through a first unit for turning, a second unit for milling, a third unit for grinding, and a fourth unit. And a buffer sampling station is provided between each processing device. When loading, the workpiece in the support seat on the conveyor belt is clamped by the robotic arm.

[0004] In view of the above related technologies, the workpiece in the support seat is manually placed in the initial position. And for the convenience of placement, the middle piece 12 of the workpiece is not restricted, that is, the workpiece can move a certain distance along the axial direction of the long shaft 11. When the robotic arm directly clamps the workpiece, the position is prone to slight deviation. When the robotic arm clamps the workpiece and moves it into the corresponding processing device for processing, there will be a certain deviation in the processing positions of different workpieces, affecting the processing quality of the workpiece. Summary of the Invention

[0005] In order to reduce the impact on the processing quality of the workpiece, this application provides a crankshaft processing production line.

[0006] The crankshaft processing production line provided by this application adopts the following technical solutions.

[0007] A crankshaft processing production line includes several front processing centers arranged in a row for performing the same processing on workpieces, several rear processing centers arranged in a row for performing the same processing on workpieces and processing that the front processing centers do not perform, two long rails respectively arranged above the front processing centers and above the rear processing centers in one-to-one correspondence, a front robotic arm slidably connected to the long rail close to the front processing center and capable of clamping and moving the workpiece, a rear robotic arm slidably connected to the long rail close to the rear processing center and capable of clamping and moving the workpiece, a loading table close to the front processing center, a loading member driven by the receiving table and for positioning and placing long shafts and short shafts, a clamping jaw cylinder for clamping and moving the workpiece placed in the loading member, a positioning seat for receiving the workpiece clamped by the clamping jaw cylinder, and a positioning abutting block for forcing the middle piece to abut tightly against the positioning seat along the axial direction of the long shaft. The front robotic arm clamps the workpiece on the positioning seat.

[0008] By adopting the above technical solution, the workpieces on the loading member can all be placed on the positioning seat, and the positioning abutting block enables the workpiece to obtain positioning along the axial direction of the long shaft, so that the positions of the workpieces clamped by the front robotic arm each time can be relatively consistent, and during the subsequent processing of the workpiece, the processing quality of the workpiece can be more stable and not easily affected.

[0009] Optionally, several rows of the loading members are arranged along the length direction of the long rail, several loading members are arranged along the width direction of the long rail in each row, the loading table is provided with a replenishment distance sensor and a material exhaustion distance sensor for controlling the loading member to move closer to the positioning seat corresponding to each row of loading members. The replenishment distance sensor and the material exhaustion distance sensor respectively face the long shaft or short shaft of a workpiece. The material exhaustion distance sensor faces the workpiece on the loading member closest to the positioning seat. The distance between the replenishment distance sensor and the positioning seat is greater than the distance between the material exhaustion distance sensor and the positioning seat.

[0010] By adopting the above technical solution, when the replenishment sensor cannot detect the workpiece, it indicates that the number of workpieces on the loading table is not much and the worker needs to replenish the workpieces in time. When the material exhaustion distance sensor cannot detect the workpiece, it indicates that there is no workpiece on the loading member closest to the long rail at this time, and the clamping jaw cylinder will no longer perform the workpiece clamping operation.

[0011] Optionally, the loading table is provided with several columns, a pushing cylinder is arranged at the upper end of each column, a positioning seat is fixedly connected to the power rod of each pushing cylinder. The loading table is provided with a gantry. A frame box is slidably connected to the gantry along the length direction of the long rail. A vertical rod driven by the frame box to move is slidably connected to the frame box along the vertical direction. A rotary cylinder is arranged on the vertical rod, and the rotary shaft of the rotary cylinder is fixedly connected to the clamping jaw cylinder.

[0012] By adopting the above technical solution, after the jaw cylinder grabs the workpiece, it rotates to tilt upward, and then the positioning seat is pushed out away from the column, so that one end of the workpiece grabbed by the jaw cylinder can pass through the positioning seat from top to bottom to place the workpiece on the positioning seat. Then the jaw cylinder moves away, and the positioning seat resets to complete the movement of the workpiece from the feeding part to the positioning seat.

[0013] Optionally, the column is provided with a positioning cylinder. The positioning abutting block is slidably connected to the positioning seat along the long-axis axis. The positioning abutting block is fixedly connected with a sleeve block slidably connected to the positioning seat. An inner rail of the block is fixedly connected inside the sleeve block. The power rod of the positioning cylinder is fixedly connected with a rod slider slidably connected to the inner rail of the block along the moving direction of the power rod of the pushing cylinder.

[0014] By adopting the above technical solution, the sleeve block can also move relative to the rod slider during the movement of the positioning seat, and the movement of the rod slider can push the sleeve block to move, so that the positioning abutting block can smoothly abut the workpiece against the positioning seat to complete the positioning work.

[0015] Optionally, the column is provided with a material-transfer proximity sensor facing the front robotic arm and a positioning proximity sensor facing the middle piece. The material-transfer proximity sensor can control the positioning cylinder to drive the positioning abutting block away from the middle piece, and the positioning proximity sensor can control the positioning cylinder to drive the positioning abutting block close to the middle piece.

[0016] By adopting the above technical solution, when the positioning seat resets after receiving the workpiece, the positioning proximity sensor detects the presence of the workpiece, causing the power rod of the positioning cylinder to extend. Then, when the material-transfer proximity sensor detects the descending front robotic arm, the power rod of the positioning cylinder shortens, so that the positioning abutting block no longer abuts tightly against the middle piece, enabling the front robotic arm to smoothly grab and move the workpiece.

[0017] Optionally, two wide rails are provided between the two long rails. Two buffer boxes for workpieces that are only processed in the front processing center are slidably connected to the two wide rails. The front robotic arm can move the workpiece into the buffer box, and the rear robotic arm can move the workpiece in the buffer box into the rear processing center.

[0018] By adopting the above technical solution, the workpiece can be conveniently transferred between the front processing center and the rear processing center.

[0019] Optionally, several box grooves for placing workpieces are formed in the buffer box, and the buffer box is provided with a transfer box distance sensor for detecting whether there is a workpiece in each corresponding box groove.

[0020] By adopting the above technical solution, the number of workpieces in the buffer box can be controlled, so that the external controller can more accurately control the movement of the buffer box.

[0021] Optionally, a blanking conveyor belt capable of receiving the processed workpieces is provided above the post-processing center, and a blanking chute for receiving the workpieces is provided at one end of the blanking conveyor belt where the workpieces fall.

[0022] By adopting the above technical solution, the rear robotic arm does not need to move to a lower position to lower the workpiece, so that the rear robotic arm can better move the workpieces into or out of multiple post-processing centers.

[0023] Optionally, guide rods are provided around the bottom end of the blanking chute. A receiving box that can receive the workpieces falling from the blanking chute is slidably connected to the guide rods. A turning plate that turns the workpiece into the material box is rotatably connected inside the receiving box. A side baffle is fixedly connected to one side of the turning plate away from its rotation point. The side baffle can abut against the side of the receiving box away from the rotation point of the turning plate. When the side baffle abuts against the receiving box, it is located at the lowest point of the turning plate. A forced turning rod that can abut against the turning plate to force the turning plate to rotate is fixedly connected to the lower part of the guide rod.

[0024] By adopting the above technical solution, when the workpiece falls onto the turning plate, the receiving box moves downward, and the bottom surface of the turning plate abuts against the forced turning rod, causing the turning plate to rotate, so as to drive the workpiece to rotate synchronously until the turning plate changes from the position where the side baffle is at the lowest point of the inclination of the turning plate to the position where the side baffle is at the highest point of the inclination of the turning plate, so that the workpiece can slide off the turning plate and enter the material box.

[0025] Optionally, a blanking distance sensor is provided on the guide rod at the position directly opposite to the side where the side baffle of the turning plate is provided. The blanking distance sensor can control the receiving box to move towards the forced turning rod when there is a workpiece on the turning plate.

[0026] By adopting the above technical solution, the blanking distance sensor can detect the workpiece falling onto the turning plate to realize the automatic blanking of the workpiece.

[0027] In summary, the present application has at least the following beneficial effects:

[0028] The positioning abutting block enables the workpiece to obtain positioning in the direction of the long axis, so that the position of the workpiece clamped by the front robotic arm each time can be relatively consistent, so that during the subsequent processing of the workpiece, the processing quality of the workpiece can be more stable and not easily affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the main structure of the present application;

[0030] Figure 2 is a schematic diagram of the structure at the material table and with a partial cross-section of a positioning seat;

[0031] Figure 3 is Figure 2 the enlarged view at A in

[0032] Figure 4 is Figure 1 The enlarged view at position B in

[0033] Figure 5 is Figure 1 The enlarged view at position C in

[0034] Figure 6 It is a schematic structural view of a crankshaft workpiece in the background art.

[0035] Explanation of reference numerals: 1, front processing center; 11, long shaft; 12, middle piece; 13, short shaft; 2, rear processing center; 21, turnover plate; 22, side baffle; 23, forced rotation rod; 24, blanking distance sensor; 25, inclined surface of the abutting block; 3, long rail; 31, positioning proximity sensor; 32, wide rail; 33, buffer box; 34, box groove; 35, box moving distance sensor; 36, blanking conveyor belt; 37, blanking chute; 38, guide rod; 39, receiving box; 4, front robot arm; 41, gantry; 42, rack box; 43, vertical rod; 44, rotating cylinder; 45, positioning cylinder; 46, sleeve block; 47, inner rail of the block; 48, rod slider; 49, material moving proximity sensor; 5, rear robot arm; 51, material table; 52, loading part; 53, clamping jaw cylinder; 54, positioning seat; 55, positioning abutting block; 56, replenishment distance sensor; 57, material exhaustion distance sensor; 58, column; 59, pushing cylinder. Detailed implementation manners

[0036] The following further elaborates on this application with reference to the accompanying drawings.

[0037] An embodiment of this application discloses a crankshaft processing production line. Referring to Figure 1 , it includes a row of front processing centers 1 and a row of rear processing centers 2 placed on the ground. Three front processing centers 1 and rear processing centers 2 can be arranged in the same direction. Long rails 3 are fixedly connected to the factory building skeletons directly above each row of front processing centers 1 and rear processing centers 2. The length direction of the long rails 3 is the same as the arrangement direction of the row of front processing centers 1. A front robot arm 4 is slidably connected to the long rail 3 close to the front processing center 1, and a rear robot arm 5 is slidably connected to the long rail 3 close to the rear processing center 2. Both the front robot arm 4 and the rear robot arm 5 can pick up workpieces and perform vertical, lengthwise, and widthwise movements along the long rail 3.

[0038] Referring to Figure 1 and Figure 2, a material table 51 is placed on the ground near the front processing center 1. Along the length direction of the long rail 3, several rows of loading parts 52 are evenly distributed on the material table 51. Corresponding to each row of loading parts 52, a chain, a sprocket and a motor are arranged in the material table 51. Several loading parts 52 are evenly distributed on the corresponding chain, so that each row of loading parts 52 can be driven along the horizontal width direction of the long rail 3. Each loading part 52 can vertically place the long axis 11 and the short axis 13 of a workpiece. The material table 51 is fixedly connected with three columns 58 that can be arranged near the long rail 3 for the front robot arm 4 to slide. The three columns 58 are arranged at equal intervals along the length direction of the long rail 3. The upper end of each column 58 is fixedly connected with a pushing cylinder 59. The power rod of the pushing cylinder 59 is fixedly connected with a positioning seat 54, so that the positioning seat 54 can move along the width direction of the long rail 3. The long axis 11 and the short axis 13 of the workpiece are placed vertically on the positioning seat 54.

[0039] Refer to Figure 2 , a vertical gantry 41 is fixedly connected to the material table 51. The length direction of the gantry 41 is consistent with the length direction of the long rail 3. The gantry 41 is slidably connected with a frame box 42 along its own length direction. The frame box 42 is sleeved and slidably connected with a vertical rod 43 along the vertical direction. A motor and a gear can be arranged inside the frame box 42 and cooperate with the racks on the gantry 41 and the vertical rod 43, so that the frame box 42 and the vertical rod 43 move correspondingly. The bottom end of the vertical rod 43 is fixedly connected with a rotary cylinder 44. The rotation axis direction of the rotary cylinder 44 is consistent with the length direction of the long rail 3. The rotating shaft of the rotary cylinder 44 is fixedly connected with a clamping jaw cylinder 53. The clamping jaw cylinder 53 can clamp the workpiece placed on the loading part 52 closest to the column 58 in each row. The clamping jaw cylinder 53 can be driven by the rotary cylinder 44 to rotate from the vertical state to a state where one end of the clamped workpiece is tilted upward, so that the workpiece can move from the loading part 52 to the positioning seat 54.

[0040] Refer to Figure 2 , the material table 51 is provided with a replenishment distance sensor 56 for each workpiece in one of the loading parts 52 in each row. The connecting direction of all the replenishment distance sensors 56 is consistent with the length direction of the gantry 41. The replenishment distance sensor 56 is located on the side of the gantry 41 away from the column 58. When the loading part 52 without a workpiece moves to the replenishment distance sensor 56, the detected distance by the replenishment distance sensor 56 is greater than the distance value preset by the external controller, so that the external sound and light alarm gives a corresponding alarm reminder, so that the worker can timely replenish the workpiece on the loading part 52. The material table 51 is provided with a material exhaustion distance sensor 57 for each workpiece in the loading part 52 closest to the column 58 in each row. When the material exhaustion distance sensor 57 cannot detect the existence of the workpiece, the external controller will make each row of loading parts 52 drive forward by the position of one loading part 52, so that the workpiece can continuously move to the position where the clamping jaw cylinder 53 can clamp.

[0041] Refer toFigure 2 and Figure 3 For each positioning seat 54, a positioning abutting block 55 is slidably connected to the gantry 41 in the length direction. The middle piece 12 is located between the positioning abutting block 55 and the vertical surface of the positioning seat 54. The positioning abutting block 55 abuts against the side surface of the middle piece 12 facing the short axis 13. A sleeve block 46 is fixedly connected to the side of the positioning abutting block 55 away from the middle piece 12. The sleeve block 46 is inserted through and slidably connected to the positioning seat 54 in the length direction of the gantry 41. An inner block slide rail 47 is fixedly connected to the sleeve block 46 along the moving direction of the power rod of the pushing cylinder 59. A rod slider 48 is slidably connected to the inner block slide rail 47 along the length direction of the inner block slide rail 47. A positioning cylinder 45 is fixedly connected to the column 58. The length direction of the power rod of the positioning cylinder 45 is consistent with the length direction of the gantry 41. The end of the power rod of the positioning cylinder 45 is fixedly connected to the rod slider 48, so that the positioning abutting block 55 can be driven by the positioning cylinder 45 while moving with the positioning seat 54 to tightly abut the middle piece 12 against the vertical surface of the positioning seat 54, thereby determining the position of the workpiece along the axis direction of the long axis 11. At the same time, an abutting block inclined surface 25 is formed on the side of the upper part of the positioning abutting block 55 away from the sleeve block 46, so that the middle piece 12 can move downward along the abutting block inclined surface 25 even if it falls on the upper part of the positioning abutting block 55, so that the workpiece can be placed in place on the positioning seat 54.

[0042] Referring to Figure 3 , a material transfer proximity sensor 49 and a positioning proximity sensor 31 are fixedly connected to the column 58. The positioning proximity sensor 31 faces the workpiece placed on the positioning seat 54. When the power rod of the pushing cylinder 59 shortens, the positioning seat 54 can drive the workpiece to face the positioning proximity sensor 31. At this time, the positioning proximity sensor 31 detects the presence of the workpiece, so that the external controller can make the power rod of the positioning cylinder 45 extend, so that the positioning abutting block 55 moves towards the middle piece 12 to position the workpiece. Then the front robotic arm 4 can move downward to clamp the workpiece on the positioning seat 54, so that the material transfer proximity sensor 49 detects that the front robotic arm 4 has moved in place, so that the external controller can control the shortening of the power rod of the positioning cylinder 45, so that the workpiece is no longer tightly abutted by the positioning abutting block 55, so that the workpiece can be smoothly clamped by the front robotic arm 4.

[0043] Referring to Figure 1 and Figure 4, two wide rails 32 are fixedly connected between the two long rails 3. The length direction of the wide rail 32 is consistent with the width direction of the long rail 3. Each wide rail 32 is slidably connected with a buffer box 33 along its own length direction. The two buffer boxes 33 are respectively close to the front processing center 1 and the rear processing center 2. The buffer box 33 can be provided with a motor and a gear and cooperate with the rack arranged on the wide rail 32 for directional movement. A plurality of box grooves 34 are uniformly arranged in the buffer box 33 along the length direction of the wide rail 32. Each box groove 34 is for a workpiece to be placed vertically. The buffer box 33 is provided with a transfer box distance sensor 35 for each workpiece placed in each box groove 34. When a workpiece is placed in the box groove 34, the distance value detected by the transfer box distance sensor 35 is less than the preset distance value in the external controller, so that the external controller knows that there is a workpiece in the corresponding box groove 34. When there is no workpiece in the buffer box 33 close to the rear processing center 2 and there is a workpiece in the buffer box 33 close to the front processing center 1, the two buffer boxes 33 move so that the workpiece processed by the front processing center 1 can move to the position where the rear robot arm 5 can clamp it.

[0044] Refer to Figure 1 and Figure 5 , at one end of the long rail 3 close to the upper part of the rear processing center 2, a blanking conveyor belt 36 is provided. The rear robot arm 5 places the workpiece processed by the rear processing center 2 on the blanking conveyor belt 36. At the end where the blanking conveyor belt 36 allows the workpiece to fall, a blanking chute 37 is fixedly connected. The highest end of the blanking chute 37 is directly opposite to the end of the blanking conveyor belt 36, so that the workpiece can slide down along the inclined surface of the blanking chute 37 from the blanking conveyor belt 36. A vertical guide rod 38 is fixedly connected to the ground at the bottom end of the blanking chute 37. The guide rod 38 is slidably connected with a receiving box 39 along the vertical direction. The receiving box 39 can be provided with a motor and a gear and cooperate with the rack on the guide rod 38 for stable movement. A turning plate 21 is rotatably connected in the receiving box 39. The rotation axis direction of the turning plate 21 is consistent with the transmission direction of the blanking conveyor belt 36. A side baffle 22 is fixedly connected to the side of the turning plate 21 away from its rotation point. The side baffle 22 can be perpendicular to the turning plate 21. The side baffle 22 can abut against the inner wall of the receiving box 39 away from the rotation point of the turning plate 21, so that the turning plate 21 can maintain the state where the side where the side baffle 22 is set is the lowest point, so that the workpiece falling from the blanking chute 37 falls onto the turning plate 21.

[0045] Refer to Figure 5, a blanking distance sensor 24 is fixedly connected to the upper end of the guide rod 38. The blanking distance sensor 24 faces the inclined upper surface of the tipping plate 21 near the side baffle 22. When a certain amount of workpieces fall on the tipping plate 21, the distance value detected by the blanking distance sensor 24 is less than the preset distance value in the external controller, causing the receiving box 39 to move downward. A vertical forced rotation rod 23 is fixedly connected to the bottom end of the guide rod 38. The upper end of the forced rotation rod 23 can abut against the inclined bottom surface of the tipping plate 21, causing the tipping plate 21 to rotate to the side where the side baffle 22 is provided as the highest point of the inclination of the tipping plate 21, so that the workpieces can slide down along the inclined surface of the tipping plate 21 and fall into the material box for collection. After the receiving box 39 moves upward and away from the forced rotation rod 23, the tipping plate 21 resets under the action of its own and the gravity of the side baffle 22.

[0046] The implementation principle of a crankshaft processing production line according to an embodiment of the present application is as follows: The loading member 52 moves the workpiece to the position closest to the positioning seat 54, and then the clamping jaw cylinder 53 clamps and places the workpiece on the positioning seat 54 pushed out by the power rod of the pushing cylinder 59 extending. Then, the power rod of the pushing cylinder 59 shortens, and the power rod of the positioning cylinder 45 extends to make the positioning abutting block 55 tightly abut the middle piece 12 against the positioning seat 54. Then, the front robotic arm 4 moves the workpiece from the positioning seat 54 into the front processing center 1 for corresponding processing. After the processing is completed, the front robotic arm 4 moves the workpiece into the buffer box 33 again.

[0047] The buffer box 33 moves towards the rear processing center 2, so that the rear robotic arm 5 can clamp the workpiece and move it into the rear processing center 2 for processing. Then, the rear robotic arm 5 clamps the workpiece and moves it onto the blanking conveyor belt 36 and sends it onto the blanking ramp 37 and then falls onto the tipping plate 21. Then, the receiving box 39 moves downward so that the forced rotation rod 23 abuts against the tipping plate 21, causing the tipping plate 21 to rotate to slide the workpiece into the material box.

[0048] The above are all the preferred embodiments of the present application. Without restricting the protection scope of the present application accordingly, therefore: All equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A crankshaft processing production line, characterized in that: It includes several pre - processing centers (1) arranged in a row for performing the same processing on workpieces, several post - processing centers (2) arranged in a row for performing the same processing on workpieces and processing that the pre - processing centers (1) do not perform, two long rails (3) respectively arranged above the pre - processing centers (1) and above the post - processing centers (2) in one - to - one correspondence, a front robotic arm (4) slidably connected to the long rail (3) near the pre - processing center (1) and capable of clamping and moving the workpiece, a rear robotic arm (5) slidably connected to the long rail (3) near the post - processing center (2) and capable of clamping and moving the workpiece, a loading table (51) near the pre - processing center (1), a loading part (52) driven by the loading table (51) and for positioning and placing the long shaft (11) and the short shaft (13), a jaw cylinder (53) for clamping and moving the workpiece placed in the loading part (52), a positioning seat (54) for receiving the workpiece clamped by the jaw cylinder (53), a positioning abutting block (55) for forcing the middle piece (12) to abut against the positioning seat (54) along the axis direction of the long shaft (11), and the front robotic arm (4) clamps the workpiece on the positioning seat (54); Above the post - processing center (2), there is a blanking conveyor belt (36) capable of receiving the processed workpiece. At the end of the blanking conveyor belt (36) where the workpiece falls, there is a blanking chute (37) for receiving the workpiece; There are guide rods (38) around the bottom end of the blanking chute (37). A receiving box (39) slidably connected to the guide rods (38) and capable of receiving the workpiece falling from the blanking chute (37) is provided. Inside the receiving box (39), there is a turning plate (21) rotatably connected for turning the workpiece into the material box. On the side of the turning plate (21) away from its rotation point, there is a side baffle (22) fixedly connected. The side baffle (22) can abut against the side of the receiving box (39) away from the rotation point of the turning plate (21). When the side baffle (22) abuts against the receiving box (39), it is at the lowest point of the turning plate (21). At the lower part of the guide rod (38), there is a forced - turning rod (23) fixedly connected and capable of abutting against the turning plate (21) to force the turning plate (21) to rotate.

2. The crankshaft processing production line according to claim 1, characterized in that: The loading parts (52) are arranged in several rows along the length direction of the long rail (3). Several loading parts (52) are arranged in each row along the width direction of the long rail (3). For each row of loading parts (52), the loading table (51) is respectively provided with a replenishment distance sensor (56) and a material - exhaustion distance sensor (57) for controlling the loading part (52) to move closer to the positioning seat (54). The replenishment distance sensor (56) and the material - exhaustion distance sensor (57) respectively face the long shaft (11) or the short shaft (13) of a workpiece. The material - exhaustion distance sensor (57) faces the workpiece of the loading part (52) closest to the positioning seat (54). The distance between the replenishment distance sensor (56) and the positioning seat (54) is greater than the distance between the material - exhaustion distance sensor (57) and the positioning seat (54).

3. A crankshaft processing production line according to claim 1, characterized in that: The material table (51) is provided with several columns (58). A pushing cylinder (59) is arranged at the upper end of each column (58). A positioning seat (54) is fixedly connected to the power rod of each pushing cylinder (59). The material table (51) is provided with a gantry (41). The gantry (41) is slidably connected with a frame box (42) along the length direction of the long rail (3). The frame box (42) is slidably connected with a vertical rod (43) that moves driven by the frame box (42) in the vertical direction. A rotating cylinder (44) is arranged on the vertical rod (43). The rotating shaft of the rotating cylinder (44) is fixedly connected to the clamping jaw cylinder (53).

4. A crankshaft processing production line according to claim 3, characterized in that: The column (58) is provided with a positioning cylinder (45). The positioning abutting block (55) is slidably connected to the positioning seat (54) along the axis direction of the long axis (11). The positioning abutting block (55) is fixedly connected to a sleeve block (46) that is slidably connected to the positioning seat (54). An inner block slide rail (47) is fixedly connected inside the sleeve block (46). The power rod of the positioning cylinder (45) is fixedly connected to a rod slider (48) that is slidably connected to the inner block slide rail (47) along the moving direction of the power rod of the pushing cylinder (59).

5. A crankshaft processing production line according to claim 4, characterized in that: The column (58) is provided with a material transfer proximity sensor (49) facing the front robot arm (4) and a positioning proximity sensor (31) facing the middle piece (12). The material transfer proximity sensor (49) can control the positioning cylinder (45) to drive the positioning abutting block (55) away from the middle piece (12), and the positioning proximity sensor (31) can control the positioning cylinder (45) to drive the positioning abutting block (55) close to the middle piece (12).

6. The crankshaft processing production line according to claim 1, characterized in that: Two wide rails (32) are arranged between the two long rails (3). Buffer boxes (33) for workpieces that have completed corresponding processing only in the front processing center (1) are slidably connected to the two wide rails (32). The front robot arm (4) can move the workpiece into the buffer box (33), and the rear robot arm (5) can move the workpiece in the buffer box (33) into the rear processing center (2).

7. A crankshaft processing production line according to claim 6, characterized in that: Several box grooves (34) for placing workpieces are formed in the buffer box (33). The buffer box (33) is provided with a transfer box distance sensor (35) corresponding to each box groove (34) for detecting whether there is a workpiece in the corresponding box groove (34).

8. A crankshaft processing production line according to claim 1, characterized in that: The guide rod (38) is provided with a blanking distance sensor (24) at the side where the side baffle (22) is arranged facing the turning plate (21). The blanking distance sensor (24) can control the receiving box (39) to move towards the forced turning rod (23) when there is a workpiece on the turning plate (21).

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