Automatic production line for drilling pin holes and chamfering bolts

Abstract

The present invention discloses an automatic production line for drilling pin holes and chamfering bolts, which relates to the technical field of bolt processing in electric power, railway equipment, and mechanical engineering. The production line includes a loading box, a lifting mechanism, a workpiece flipping mechanism, a workpiece pressing device, and a drilling and chamfering device. The workpiece flipping mechanism includes a first workpiece transfer pipeline, a second workpiece transfer pipeline, a workpiece pushing pump, and a workpiece receiving plate. The workpiece receiving plate is provided with a workpiece receiving groove for receiving bolts. The workpiece pressing device includes a workpiece transfer mechanism, which includes a workpiece feeding plate, a fixed connecting rod, a first rotating connecting rod, and a second rotating connecting rod. One end of the first rotating connecting rod and one end of the second rotating connecting rod are respectively movably connected to the left and right ends of the fixed connecting rod and can rotate circumferentially around the movable connection points. The other ends of the first rotating connecting rod and the second rotating connecting rod are respectively fixedly connected to the workpiece feeding plate. The present invention can automatically load, process, and unload bolts, improving the processing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of bolt processing in the power industry, railway equipment, and mechanical engineering, and specifically to an automatic production line for drilling pin holes and chamfering bolts. Background Art

[0002] In the power industry and many other industries, a large number of bolts are used. Due to long-term operation and vibration, nuts will gradually loosen. Therefore, we need to drill pin holes in various types of bolts. However, burrs will be generated after drilling, so chamfering is required. Since the processing volume is huge, thousands of sets need to be processed every day, and it is easy for workers to get fatigued and prone to accidents during operation. Based on this, a fully automatic processing line is designed, which greatly improves production efficiency and saves labor costs. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an automatic production line for drilling pin holes and chamfering bolts. This production line does not require programming. During debugging, only the time interval and the position clearance of the products need to be adjusted. Just put the workpieces (unprocessed bolts) into the feed box, and the finished products will come out automatically. Workers only need to transfer the workpieces, and one worker can monitor multiple automatic production lines, which greatly improves production efficiency and reduces the labor intensity of workers.

[0004] The purpose of the present invention is achieved through the following technical solutions: An automatic production line for drilling pin holes and chamfering bolts, the automatic production line includes a loading box, a lifting mechanism, a workpiece flipping mechanism, a workpiece pressing device, and a drilling and chamfering device. The loading box is connected to the workpiece flipping mechanism through a chain conveyor belt. The workpiece flipping mechanism includes a workpiece transfer pipeline, a pushing pump, and a workpiece receiving plate. The workpiece transfer pipeline includes a first workpiece transfer pipeline and a second workpiece transfer pipeline. The workpiece receiving plate is provided with a workpiece receiving groove for receiving bolts. The first workpiece transfer pipeline is arranged above the workpiece receiving plate, and the second workpiece transfer pipeline is arranged on the right side of the workpiece receiving plate. The inlet of the first workpiece transfer pipeline faces the chain conveyor belt, facilitating the entry of bolts on the chain conveyor belt into the first workpiece transfer pipeline. The outlet of the first workpiece transfer pipeline faces the workpiece receiving groove on the workpiece receiving plate, facilitating the bolts to fall from the first workpiece transfer pipeline and partially catch in the workpiece receiving groove. The pushing pump is arranged above the workpiece receiving groove. The centers of the pushing pump, the workpiece receiving plate, and the second workpiece transfer pipeline are all on the same straight line, enabling the pushing pump to accurately push the bolts into the inlet of the second workpiece transfer pipeline.

[0005] Further, the workpiece pressing device is arranged below the workpiece flipping mechanism. The workpiece pressing device includes a workpiece placing bracket, a baffle, a workpiece conveying mechanism and a pressing mechanism. The workpiece conveying mechanism includes a workpiece feeding plate, a fixed connecting rod and a rotating connecting rod. The rotating connecting rod includes a first rotating connecting rod and a second rotating connecting rod. One end of the first rotating connecting rod and one end of the second rotating connecting rod are respectively movably connected to the left and right ends of the fixed connecting rod and can rotate circumferentially around the movable connection. The other end of the first rotating connecting rod and the other end of the second rotating connecting rod are respectively fixedly connected to the workpiece feeding plate. After the workpiece feeding plate, the fixed connecting rod, the first rotating connecting rod and the second rotating connecting rod are connected, they form a parallelogram shape. The workpiece placing bracket and the workpiece feeding plate are both provided with several slots for placing bolts, which is convenient for the workpiece conveying mechanism to drive the bolts into the next slot during the circumferential rotation movement.

[0006] Further, a feeding opening is arranged at the top of the loading box. Inside the loading box, two first feeding steps and a second feeding step with increasing heights are arranged at intervals from left to right. The lifting mechanism is arranged below the loading box. The lifting mechanism includes a lifting plate, a speed reducer and a base. Three first plates, a second plate and a third plate with increasing heights are arranged at intervals from left to right on the lifting plate. The first plate, the second plate and the third plate penetrate into the inside of the loading box. The first plate and the second plate are respectively arranged on the left and right sides of the first feeding step. The second plate and the third plate are respectively arranged on the left and right sides of the second feeding step. The position of the lifting plate is opposite to the feeding opening, and the third plate penetrates out of the feeding opening, which is convenient for the bolts to fall onto the chain conveyor belt. The lifting plate is fixedly connected to the base through a lifting plate guide post. The speed reducer is arranged on the base and connected to the lifting plate. The loading box is fixedly connected to the base through a column. The loading box is arranged to be inclined downward. The height of the loading box at the position where the lifting plate is located is lower than the height of the loading box at the position where the column is located. The speed reducer includes a reduction box and a first motor. The reduction box is connected to the first motor. The reduction box is provided with a first connecting rod. The first connecting rod is connected to a second connecting rod through a first connecting hinge. The bottom of the lifting plate is connected to the second connecting rod through a second connecting hinge. When the first motor starts to rotate, the first connecting rod starts to perform a circumferential movement. The first connecting rod drives the second connecting rod, and the second connecting rod drives the lifting plate to perform a reciprocating up and down movement. The first plate, the second plate and the third plate follow to perform a reciprocating up and down movement. After the bolts are put into the loading box, they will roll along the inclined angle to the first plate. When the first plate moves down to the same height as the bottom of the loading box, the bolts roll onto the first plate. The first plate starts to move up to the same height as the first feeding step, and the bolts roll from the first plate onto the first feeding step. When the second plate moves down to the same height as the first feeding step, the bolts roll from the first feeding step onto the second plate, and so on, until the bolts roll from the feeding opening onto the chain conveyor belt.

[0007] Furthermore, the chain conveyor belt and the workpiece transfer mechanism are both provided with reduction motors to facilitate speed control.

[0008] Preferably, the bolt includes a nut and a screw rod. The width of the connector slot is smaller than the width of the nut, and the width of the connector slot is not less than the diameter of the screw rod. When the screw rod end faces downward, the screw rod is inserted into the connector slot, and the pusher pump pushes the bolt, causing the bolt to flip so that the nut end faces downward and falls into the second workpiece transfer pipe. When the nut end faces downward, the nut is larger than the width of the connector slot, resulting in the nut being on the top plane of the connector plate. At this time, the pusher pump pushes the bolt, causing the bolt to translate so that the nut end faces downward and falls into the second workpiece transfer pipe, and the nuts of the bolts face in the same direction.

[0009] Furthermore, the pressing mechanism includes a presser and a pressing pump. The presser is opposite to the bottom of the bolt placed in the slot, the baffle is arranged at the head position of the bolt, the pressing pump is connected to the presser, and the presser presses the bolt towards the baffle.

[0010] Furthermore, the drilling and chamfering device is arranged above the workpiece pressing device. The drilling and chamfering device includes a drilling bit, a chamfering bit and a second motor. First pulleys, third pulleys and second pulleys are respectively arranged at the tops of the drilling bit, the chamfering bit and the second motor. The first pulley, the second pulley and the third pulley are connected by a belt, and the first pulley, the second pulley and the third pulley are all on the same horizontal plane, facilitating the rotation of the first pulley, the second pulley and the third pulley together.

[0011] Furthermore, the drilling and chamfering device further includes a bracket. The bracket is fixedly connected to the drilling bit, the chamfering bit and the second motor respectively. A lifting pump is arranged at the top of the bracket, and the lifting pump drives the bracket to rise or fall, thereby driving the drilling bit and the chamfering bit to rise or fall.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The present invention makes the nut end of the bolt fall downward by restricting the width of the connector slot, so that the bolts have the same orientation on the workpiece pressing device.

[0014] 2. The present invention uses the workpiece transfer mechanism to send the bolts of unprocessed bolts to the position for drilling, send the drilled bolts to the position for chamfering, and at the same time send the bolts that have completed both drilling and chamfering to the blanking position for collection.

[0015] 3. The present invention presses the bolts tightly through the pressing mechanism to prevent the bolts from moving and improve the machining accuracy.

[0016] 4. The drilling and chamfering device of the present invention can perform drilling and chamfering operations simultaneously, greatly reducing the processing time and improving the processing efficiency.

[0017] 5. The present invention adopts an automated production method, which greatly improves the safety guarantee of operators and effectively avoids the occurrence of production accidents that endanger personal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a flowchart of the automatic production line for drilling pin holes and chamfering bolts of the present invention;

[0019] Figure 2 is a schematic structural diagram of the loading box, lifting mechanism, workpiece flipping mechanism, workpiece pressing device and drilling and chamfering device of the present invention;

[0020] Figure 3 is a front view of the loading box and lifting mechanism of the present invention;

[0021] Figure 4 is Figure 3 a left view of the lifting plate with the guide posts removed;

[0022] Figure 5 is a schematic structural diagram of the lifting plate of the present invention;

[0023] Figure 6 is a front view of the workpiece flipping mechanism when the bolt falls with the bottom facing down;

[0024] Figure 7 is Figure 6 a top view of the first workpiece transfer pipeline removed;

[0025] Figure 8 is a front view of the workpiece flipping mechanism when the bolt falls with the head facing down;

[0026] Figure 9 is Figure 8 a top view of the first workpiece transfer pipeline removed;

[0027] Figure 10 is a front view of the workpiece pressing device of the present invention;

[0028] Figure 11 is Figure 10 a top view of

[0029] Figure 12 is a schematic structural diagram of the workpiece transfer mechanism of the present invention;

[0030] Figure 13 is a front view of the drilling and chamfering device of the present invention;

[0031] Figure 14 is Figure 13 a left view of

[0032] In the figure: 1 - loading box, 2 - lifting mechanism, 3 - workpiece flipping mechanism, 4 - workpiece pressing device, 5 - drilling and chamfering device, 6 - base, 7 - reducer, 8 - lifting plate guide pillar, 9 - reduction box, 10 - first motor, 11 - first connecting rod, 12 - second connecting rod, 13 - first connecting hinge, 14 - second connecting hinge, 15 - chain conveyor belt, 16 - first board, 17 - first workpiece transfer pipe, 18 - second workpiece transfer pipe, 19 - workpiece pushing pump, 20 - workpiece receiving board, 21 - workpiece receiving groove, 22 - bolt, 23 - workpiece transfer mechanism, 24 - workpiece placing bracket, 25 - first loading step, 26 - workpiece feeding board, 27 - fixed connecting rod, 28 - first rotating connecting rod, 29 - second rotating connecting rod, 30 - baffle, 31 - presser, 32 - pressing pump, 33 - pressing mechanism, 34 - groove, 35 - drilling bit, 36 - chamfering bit, 37 - second motor, 38 - first pulley, 39 - second pulley, 40 - third pulley, 41 - bracket, 42 - lifting pump, 43 - second loading step, 44 - second board, 45 - third board. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] As Figures 1 to 14As shown in the figure, there is an automatic production line for drilling pin holes and chamfering bolts. The automatic production line includes a loading box 1, a lifting mechanism 2, a workpiece flipping mechanism 3, a workpiece pressing device 4, and a drilling and chamfering device 5. The loading box 1 is connected to the workpiece flipping mechanism 3 through a chain conveyor 15. The workpiece flipping mechanism 3 includes a workpiece transfer pipeline, a pushing pump 19, and a workpiece receiving plate 20. The workpiece transfer pipeline includes a first workpiece transfer pipeline 17 and a second workpiece transfer pipeline 18. The workpiece receiving plate 20 is provided with a workpiece receiving groove 21 for receiving the bolt 22. The first workpiece transfer pipeline 17 is arranged above the workpiece receiving plate 20, and the second workpiece transfer pipeline 18 is arranged on the right side of the workpiece receiving plate 20. The inlet of the first workpiece transfer pipeline 17 faces the chain conveyor 15, and the outlet of the first workpiece transfer pipeline 17 faces the workpiece receiving groove 21 on the workpiece receiving plate 20. The pushing pump 19 is arranged above the workpiece receiving groove 21. The centers of the pushing pump 19, the workpiece receiving plate 20, and the second workpiece transfer pipeline 18 are all on the same straight line. First, the worker puts the bolts 22 to be processed into the loading box 1. The bolts 22 to be processed are sent from bottom to top to the chain conveyor 15 through the lifting mechanism 2, and then conveyed to the workpiece flipping mechanism 3 through the chain conveyor 15. The bolts 22 falling down along the first workpiece transfer pipeline 17 are partially stuck in the workpiece receiving groove 21. Under the push of the pushing pump 19, the bolts 22 are flipped into the second workpiece transfer pipeline 18.

[0036] As Figures 10 to 12 shown in the figure, the workpiece pressing device 4 is arranged below the workpiece flipping mechanism 3. The workpiece pressing device 4 includes a workpiece placing bracket 24, a baffle 30, a workpiece transfer mechanism 23, and a pressing mechanism 33. The workpiece transfer mechanism 23 includes a workpiece sending plate 26, a fixed connecting rod 27, and a rotating connecting rod. The rotating connecting rod includes a first rotating connecting rod 28 and a second rotating connecting rod 29. One end of the first rotating connecting rod 28 and one end of the second rotating connecting rod 29 are respectively movably connected to the left and right ends of the fixed connecting rod 27 and can rotate in a circular motion around the movable connection. The other end of the first rotating connecting rod 28 and the other end of the second rotating connecting rod 29 are respectively fixedly connected to the workpiece sending plate 26. The workpiece placing bracket 24 and the workpiece sending plate 26 are both provided with several grooves 34 for placing the bolts 22. The bolts 22 fall from the second workpiece transfer pipeline 18 and roll down along the slope arranged on the left side of the workpiece placing bracket 24. The workpiece sending plate 26, the fixed connecting rod 27, and the rotating connecting rod are connected into a parallelogram. The second rotating connecting rod 29 starts to make a circular motion, and at the same time drives the workpiece sending plate 26. The workpiece sending plate 26 drives the first rotating connecting rod 28 to make a circular motion together. The grooves 34 on the workpiece sending plate 26 accurately lift the bolts 22 rolling at the bottom of the slope, and along the circular motion route, send the bolts 22 to the grooves 34 on the workpiece placing bracket 24 and then continue to make a circular motion. And the bolts 22 start to be processed. The processed bolts 22 are taken away by the grooves 34 on the workpiece sending plate 26 making a second circular motion, and sent to the top of the slope arranged on the right side of the workpiece placing bracket 24, so that the processed bolts 22 roll down along the slope for collection.

[0037] As shown Figures 2 to 5 In the figure, a feeding port is provided at the top of the loading bin 1. Inside the loading bin 1, two first feeding steps 25 and second feeding steps 43 with increasing heights are arranged at intervals from left to right. The lifting mechanism 2 is arranged below the loading bin 1. The lifting mechanism 2 includes a lifting plate, a speed reducer 7 and a base 6. Three first plates 16, second plates 44 and third plates 45 with increasing heights are arranged at intervals from left to right on the lifting plate. The first plates 16, second plates 44 and third plates 45 penetrate into the inside of the loading bin 1. The first plates 16 and second plates 44 are respectively arranged on the left and right sides of the first feeding step 25. The second plates 44 and third plates 45 are respectively arranged on the left and right sides of the second feeding step 43. The position of the lifting plate is opposite to the feeding port, and the third plate 45 penetrates out of the feeding port. The lifting plate is fixedly connected to the base 6 through a lifting plate guide post 8. The speed reducer 7 is arranged on the base 6 and connected to the lifting plate. The loading bin 1 is fixedly connected to the base 6 through a column. The loading bin 1 is arranged to incline downward. The height of the loading bin 1 at the position where the lifting plate is located is lower than the height of the loading bin 1 at the position where the column is located. The speed reducer 7 includes a reduction box 9 and a first motor 10. The reduction box 9 is connected to the first motor 10. The reduction box 9 is provided with a first connecting rod 11. The first connecting rod 11 is connected to the second connecting rod 12 through a first connecting hinge 13. The bottom of the lifting plate is connected to the second connecting rod 12 through a second connecting hinge 14. First, the worker puts the bolts 22 to be processed into the loading bin 1. The bolts 22 will roll to the first plate 16 along the inclination angle of the loading bin 1. Start the first motor 10. The first motor 10 decelerates through the reduction box 9. The first connecting rod 11 starts to make a circular motion and drives the second connecting rod 12 to move together. The lifting plate makes a reciprocating up and down motion under the action of the lifting plate guide post 8 (that is, when the first connecting rod 11 makes a circular motion once, the lifting plate moves up and down once). When the first plate 16 moves down to the same height as the bottom of the loading bin 1, the bolts 22 roll onto the first plate 16. The first plate 16 starts to move up to the same height as the first feeding step 25. The bolts 22 roll from the first plate 16 onto the first feeding step 25. When the second plate 44 moves down to the same height as the first feeding step 25, the bolts 22 roll from the first feeding step 25 onto the second plate 44. The second plate 44 starts to move up to the same height as the second feeding step 43. The bolts 22 roll from the second plate 44 onto the second feeding step 43. When the third plate 45 moves down to the same height as the second feeding step 43, the bolts 22 roll from the second feeding step 43 onto the third plate 45. The third plate 45 starts to move up to a height exceeding the feeding port. The bolts 22 roll off the third plate 45 and fall onto the chain conveyor belt 15.

[0038] Both the chain conveyor 15 and the workpiece transfer mechanism 23 are provided with reduction motors. The bolts 22 to be processed slide from the loading port onto the chain conveyor 15. The reduction motor drives the sprocket of the chain conveyor 15 to rotate clockwise. The chain of the chain conveyor 15 makes a parallel movement under the action of two sprockets (one driving sprocket and one driven sprocket), and conveys the bolts 22 to be processed into the first workpiece transfer pipe 17. The rotation of the reduction motor drives the second rotating link 29 to make a circular motion.

[0039] As Figures 6 to 9 shown, the bolt 22 includes a nut and a screw rod. The width of the receiving slot 21 is smaller than the width of the nut, and the width of the receiving slot 21 is not less than the diameter of the screw rod. The workpiece flipping mechanism 3 makes the directions of the bolts 22 to be processed consistent (i.e., the heads of the bolts 22 are all facing downwards), and this is achieved through the receiving slot 21 and the pushing pump 19. The head orientations of the bolts 22 during the conveying process are random, while the subsequent processes require the head orientations of the bolts 22 to be consistent. There are two situations for the bolts 22 falling down along the first workpiece transfer pipe 17: one is that the bottom (i.e., the screw rod end) of the bolt 22 is facing downwards, and the screw rod directly gets stuck in the receiving slot 21. Under the push of the pushing pump 19, the bolt 22 flips, causing the head (i.e., the nut end) of the bolt 22 to face downwards and enter the second workpiece transfer pipe 18; the other is that the nut end of the bolt 22 is facing downwards, the nut is larger than the receiving slot 21, and the nut is on the top plane of the receiving plate 20. Under the push of the pushing pump 19, the bolt 22 translates with the nut end facing downwards and enters the second workpiece transfer pipe 18.

[0040] As Figures 10 to 11 shown, the pressing mechanism 33 includes a presser 31 and a pressing pump 32. The presser 31 is opposite to the bottom of the bolt 22 placed in the slot 34, and the baffle 30 is set at the head position of the bolt 22. The pressing pump 32 is connected to the presser 31. When the pressing pump 32 starts to work, the presser 31 presses against the screw rod of the bolt 22 to press the nut of the bolt 22 towards the baffle 30, ensuring that the bolt 22 will not move during processing. After processing is completed, the pressing pump 32 resets, and the presser 31 no longer presses against the bolt 22.

[0041] As Figures 13 to 14As shown in the figure, the drilling and chamfering device 5 is arranged above the workpiece pressing device 4. The drilling and chamfering device 5 includes a drilling bit 35, a chamfering bit 36 and a second motor 37. First pulleys 38, third pulleys 40 and second pulleys 39 are respectively arranged at the tops of the drilling bit 35, the chamfering bit 36 and the second motor 37. The first pulley 38, the second pulley 39 and the third pulley 40 are connected by a belt. The first pulley 38, the second pulley 39 and the third pulley 40 are all in the same horizontal plane. The drilling and chamfering device 5 further includes a bracket 41. The bracket 41 is fixedly connected to the drilling bit 35, the chamfering bit 36 and the second motor 37 respectively. A lifting pump 42 is arranged at the top of the bracket 41. The drilling and chamfering device 5 can perform drilling and chamfering operations simultaneously. The second motor 37 starts to rotate and drives the second pulley 39 to rotate. The second pulley 39 drives the first pulley 38 and the third pulley 40 to rotate together through the belt. The first pulley 38 and the third pulley 40 respectively drive the drilling bit 35 and the chamfering bit 36 to rotate. Under the action of the lifting pump 42, the drilling bit 35 and the chamfering bit 36 are pressed down to the position of the bolt 22 for processing. After the processing is completed, the lifting pump 42 resets and drives the drilling bit 35 and the chamfering bit 36 to rise. Each time the workpiece conveying mechanism 23 sends the drilled bolt 22 to the chamfering station, and at the same time sends the unprocessed bolt 22 to the drilling station, and runs in a cycle to achieve the purpose of continuous processing.

[0042] It takes 8 seconds for the automatic production line to complete a cycle of feeding, pressing by the feeding and pressing mechanism 33, drilling, chamfering and discharging, that is, 8 seconds per piece. It takes 8 - 10 seconds for manual drilling of one piece and 6 - 8 seconds for manual chamfering of one piece. On average, it takes 16 seconds to produce one bolt with both drilling and chamfering completed, not counting the time for manual handling, pressing and collecting bolts. The production efficiency of the automatic production line is more than doubled compared with manual production efficiency. If one person operates two or even three machines, the efficiency can increase exponentially. At the same time, manual operation requires manual control of the workpiece (template) and manual operation of the drilling machine for drilling. The machining accuracy is IT10 - IT13, and the surface roughness is Ra12.5 - Ra25um. The devices of the automatic production line move at a constant speed, with stable quality. The machining accuracy is IT9 - IT10, and the surface roughness is Ra3.2 - Ra6.3um. The automatic production line can ensure higher machining accuracy.

[0043] The above description is only the preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. And the changes and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. An automatic production line for drilling pin holes and chamfering bolts, characterized in that: It includes a loading box (1), a lifting mechanism (2), a workpiece flipping mechanism (3), a workpiece pressing device (4) and a drilling and chamfering device (5). There is a feeding port at the top of the loading box (1). Inside the loading box (1), two first feeding steps (25) and a second feeding step (43) with increasing heights are arranged at intervals from left to right. The lifting mechanism (2) is arranged below the loading box (1). The lifting mechanism (2) includes a lifting plate, a speed reducer (7) and a base (6). The lifting plate is provided with three plates with increasing heights, namely a first plate (16), a second plate (44) and a third plate (45), at intervals from left to right. The first plate (16), the second plate (44) and the third plate (45) penetrate into the inside of the loading box (1). The first plate (16) and the second plate (44) are respectively arranged on the left and right sides of the first feeding step (25). The second plate (44) and the third plate (45) are respectively arranged on the left and right sides of the second feeding step (43). The position of the lifting plate is opposite to the feeding port, and the third plate (45) penetrates out of the feeding port. The lifting plate is fixedly connected to the base (6) through a lifting plate guide post (8). The speed reducer (7) is arranged on the base (6) and connected to the lifting plate. The loading box (1) is fixedly connected to the base (6) through a column. The loading box (1) is arranged in a downward inclined manner. The height of the loading box (1) at the position where the lifting plate is located is lower than the height of the loading box (1) at the position where the column is located. The loading box (1) is connected to the workpiece flipping mechanism (3) through a chain conveyor belt (15). The workpiece flipping mechanism (3) includes a workpiece conveying pipeline, a pushing pump (19) and a workpiece receiving plate (20). The workpiece conveying pipeline includes a first workpiece conveying pipeline (17) and a second workpiece conveying pipeline (18). The workpiece receiving plate (20) is provided with a workpiece receiving groove (21) for receiving a bolt (22). The first workpiece conveying pipeline (17) is arranged above the workpiece receiving plate (20). The second workpiece conveying pipeline (18) is arranged on the right side of the workpiece receiving plate (20). The inlet of the first workpiece conveying pipeline (17) is opposite to the chain conveyor belt (15). The outlet of the first workpiece conveying pipeline (17) is opposite to the workpiece receiving groove (21) on the workpiece receiving plate (20). The pushing pump (19) is arranged above the workpiece receiving groove (21). The centers of the pushing pump (19), the workpiece receiving plate (20) and the second workpiece conveying pipeline (18) are all on the same straight line; The workpiece pressing device (4) is arranged below the workpiece flipping mechanism (3). The workpiece pressing device (4) includes a workpiece placing bracket (24), a baffle (30), a workpiece conveying mechanism (23) and a pressing mechanism (33). The workpiece conveying mechanism (23) includes a workpiece feeding plate (26), a fixed connecting rod (27) and a rotating connecting rod. The rotating connecting rod includes a first rotating connecting rod (28) and a second rotating connecting rod (29). One end of the first rotating connecting rod (28) and one end of the second rotating connecting rod (29) are respectively movably connected to the left and right ends of the fixed connecting rod (27) and can rotate circumferentially around the movable connection. The other end of the first rotating connecting rod (28) and the other end of the second rotating connecting rod (29) are respectively fixedly connected to the workpiece feeding plate (26). The workpiece placing bracket (24) and the workpiece feeding plate (26) are both provided with slots (34) for placing bolts (22). The chain conveyor belt (15) and the workpiece conveying mechanism (23) are both provided with reduction motors.

2. The automatic production line for drilling pin holes and chamfering bolts according to claim 1, characterized in that: The speed reducer (7) includes a reduction gearbox (9) and a first motor (10). The reduction gearbox (9) is connected to the first motor (10). The reduction gearbox (9) is provided with a first connecting rod (11). The first connecting rod (11) is connected to a second connecting rod (12) through a first connecting hinge (13). The bottom of the lifting plate is connected to the second connecting rod (12) through a second connecting hinge (14).

3. The automatic production line for drilling pin holes and chamfering bolts according to claim 1, characterized in that: The bolt (22) includes a nut and a screw rod. The width of the workpiece receiving slot (21) is smaller than the width of the nut, and the width of the workpiece receiving slot (21) is not less than the diameter of the screw rod.

4. The automatic production line for drilling pin holes and chamfering bolts according to claim 1, characterized in that: The pressing mechanism (33) includes a presser (31) and a pressing pump (32). The presser (31) is opposite to the bottom of the bolt (22) placed in the slot (34). The baffle (30) is arranged at the head position of the bolt (22). The pressing pump (32) is connected to the presser (31).

5. The automatic production line for drilling pin holes and chamfering bolts according to claim 1, characterized in that: The drilling and chamfering device (5) is arranged above the workpiece pressing device (4). The drilling and chamfering device (5) includes a drilling bit (35), a chamfering bit (36) and a second motor (37). The tops of the drilling bit (35), the chamfering bit (36) and the second motor (37) are respectively provided with a first pulley (38), a third pulley (40) and a second pulley (39). The first pulley (38), the second pulley (39) and the third pulley (40) are connected by a belt.

6. The automatic production line for drilling pin holes and chamfering bolts according to claim 5, characterized in that: The first pulley (38), the second pulley (39) and the third pulley (40) are all on the same horizontal plane.

7. The automatic production line for drilling pin holes and chamfering bolts according to claim 5 or 6, characterized in that: the drilling and chamfering device (5) further includes a bracket (41), the bracket (41) is fixedly connected to the drilling bit (35), the chamfering bit (36), and the second motor (37) respectively, and a lifting pump (42) is arranged at the top of the bracket (41).

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