A steel bar conveying device

Abstract

The present application belongs to the technical field of mechanical manufacturing, and relates to a recyclable jig and a steel bar grabbing device, which comprises a control system and a double-layer conveying frame. A plurality of blocking cylinders are arranged on the double-layer conveying frame. A jig lifting mechanism is arranged at each end of the double-layer conveying frame. A variable-distance clamping mechanism is arranged on the double-layer conveying frame. A feeding mechanism matched with the variable-distance clamping mechanism is arranged at the rear of the double-layer conveying frame. The feeding mechanism, the variable-distance clamping mechanism, the jig lifting mechanism and the blocking cylinders are connected with the control system. Through the cooperation of the double-layer conveying frame and the two jig lifting mechanisms, multiple jigs can be automatically transported and repeatedly used on the double-layer conveying frame. During the conveying process on the upper layer, the variable-distance clamping mechanism and the feeding mechanism are matched to realize automatic clamping and feeding, replacing manual placement of steel bars, improving work efficiency, reducing the working intensity of employees, realizing the automatic recycling function of the jig, and finally realizing automatic production.

Description

Technical Field

[0001] This invention relates to a steel bar conveying device, belonging to the field of mechanical manufacturing technology. Background Technology

[0002] With the development of automatic control technology, automatic systems are increasingly being applied to fields such as mechanical manufacturing technology and industrial manufacturing. In the process of mechanized production operations, the gripping of workpieces and the cyclical handling of fixtures are operations that need to be used frequently.

[0003] The existing technology has the following technical defects:

[0004] The existing manual loading and unloading method is too slow and labor-intensive, resulting in low work efficiency. Furthermore, the recycling and transportation of fixtures requires workers to transfer them and place them on the work line, which increases the workload of workers and affects production efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a steel bar conveying device.

[0006] The recyclable jig and steel bar gripping device of the present invention is characterized by: a control system and a double-layer conveyor frame; a plurality of blocking cylinders are provided on the double-layer conveyor frame; a jig lifting mechanism is provided at both ends of the double-layer conveyor frame; a variable-pitch clamping mechanism is provided on the double-layer conveyor frame; a feeding mechanism cooperating with the variable-pitch clamping mechanism is provided at the rear of the double-layer conveyor frame; the feeding mechanism, the variable-pitch clamping mechanism, the jig lifting mechanism, and the blocking cylinders are all connected to the control system; a lower drive motor and an upper drive motor are provided on the double-layer conveyor frame; the lower drive motor and the upper drive motor are respectively connected to a lower drive shaft and an upper drive shaft; both the lower drive shaft and the upper drive shaft are provided with a drive gear; the double-layer conveyor frame is also provided with driven gears that cooperate with each drive gear; a conveyor chain is wound around each cooperating drive gear and driven gear; the conveyor chains are all covered by jig guide rails.

[0007] Working process or working principle:

[0008] During operation, the control system controls the feeding mechanism to feed steel bars, and simultaneously controls the variable-pitch clamping mechanism to clamp the fed steel bars onto the fixture to be processed. The fixture carrying the steel bars is transported on the upper layer of the double-layer conveyor frame, undergoes multiple processing steps, and finally the workpiece is removed. The fixture is then transported on the upper layer to the fixture lifting mechanism on the right. The right fixture lifting mechanism lowers the fixture to the lower layer of the double-layer conveyor frame, and the fixture is then transported on the lower layer to the fixture lifting mechanism on the left. The left fixture lifting mechanism raises the fixture to the upper layer of the double-layer conveyor frame, realizing the recycling of the fixture. Similarly, the variable-pitch clamping mechanism repeats the previous clamping and feeding action, clamping and placing steel bars on a new fixture, realizing the automatic cycle of steel bar clamping and picking.

[0009] The feeding mechanism includes a feeding hopper, a feeding cylinder, and two linear guides. A fixture sliding working plate is slidably connected to the two linear guides via a slider. The fixture sliding working plate has several steel bar grooves arranged longitudinally and two gripper through grooves arranged transversely. The bottom of the feeding hopper has steel bar drop grooves corresponding to the steel bar grooves. A baffle is provided on the rear side of the fixture sliding working plate. The feeding cylinder is fixedly connected to the fixture sliding working plate via a cylinder front seat and is connected to the control system. Several steel bars are placed in the feeding hopper. The steel bars are screened and aligned with the steel bar drop grooves at the bottom of the hopper and fall into the steel bar grooves on the fixture sliding working plate. Then, the cylinder pushes them to the working position of the variable-pitch clamping mechanism to wait for the steel bars to be clamped. This action is repeated to cooperate with the variable-pitch clamping mechanism to achieve automatic feeding. A baffle is provided on the rear side of the fixture sliding working plate to prevent the steel bars in the feeding hopper from falling continuously when pushed out.

[0010] The recyclable fixture and steel bar gripping device includes a fixture lifting mechanism comprising a lifting frame, a cylinder support plate fixedly connected to the lifting frame, a fixture lifting cylinder fixedly connected to the cylinder support plate, a fixture lifting bracket fixedly connected to the cylinder rod of the fixture lifting cylinder, a conveyor belt motor mounted on the fixture lifting bracket, a conveyor belt motor connected to the conveyor belt motor, and a contact switch mounted on the fixture lifting bracket. Both the contact switch and the fixture lifting cylinder are connected to the conveyor belt motor. When the fixture enters the fixture lifting bracket and touches the contact switch, the contact switch sends a signal to the motor to stop operating, and the fixture lifting cylinder begins to rise or fall. When the fixture lifting cylinder reaches its maximum or minimum stroke, it sends a signal to the conveyor belt motor to start reversing, transporting the fixture to a double-layer conveyor frame via the conveyor belt. After the fixture is successfully delivered, the fixture lifting frame resets and repeats this action to achieve automatic lifting and transport of the fixture.

[0011] The variable-pitch clamping mechanism includes a gripper frame, on which a guide shaft and a gripper front and rear drive assembly are fixedly connected. A gripper lifting cylinder moving block is slidably connected to the guide shaft. A gripper lifting cylinder and a synchronous belt pressure plate are fixedly connected to the gripper lifting cylinder moving block. The synchronous belt pressure plate is connected to the gripper front and rear drive assembly. The cylinder rod of the gripper lifting cylinder passes through the gripper lifting cylinder moving block and is fixedly connected to a variable-pitch assembly. Several steel bar grippers are slidably connected to the variable-pitch assembly. The gripper front and rear drive assembly, the gripper lifting cylinder, and the steel bar grippers are all connected to a control system. The front and rear drive assembly drives the gripper lifting cylinder moving block to reciprocate back and forth on the guide shaft. When the steel bar grippers move to the position of clamping or releasing steel bars, the gripper lifting cylinder drives the variable-pitch assembly to descend or rise, thereby driving the steel bar grippers to rise or fall to achieve the clamping and releasing of steel bars.

[0012] The gripper's forward and backward drive assembly includes a servo motor, which is connected to a synchronous pulley via a synchronous belt. The synchronous belt pressure plate is connected to the synchronous belt, and the servo motor is connected to the control system. The synchronous belt pressure plate moves with the synchronous belt by meshing with the belt teeth, thereby driving the pitch-changing assembly to move forward and backward.

[0013] The variable pitch assembly includes a mounting plate fixedly connected to the cylinder rod of the gripper lifting cylinder. A rotary motor is fixedly connected to the bottom of the mounting plate, and a lead screw is connected to the rotary motor. A nut seat is connected to the lead screw. An ear plate is fixedly connected to both ends of the mounting plate, and a gripper guide rail is fixedly connected between the two ear plates. Several gripper sliders are slidably connected to the gripper guide rail. Two steel bar grippers are connected to each gripper slider. Each gripper slider is connected to the other by a telescopic hinge. The left-end gripper slider is fixedly connected to the nut seat. The rotary motor is connected to the control system. The rotation of the rotary motor drives the nut seat to move on the lead screw, thereby driving the gripper slider fixedly connected to the nut seat to move on the gripper guide rail. The telescopic hinge drives the connected gripper sliders to move synchronously, thereby realizing the variable pitch of the gripper.

[0014] The steel bar gripper includes a left gripper and a right gripper. Both the left and right grippers have semi-circular holes adapted to fit the steel bar. The upper ends of the left and right grippers are hinged to a right push-pull electromagnet, which is fixedly connected to the gripper slider. The lower ends of the left and right grippers have rounded corners. The push-pull electromagnet is connected to the control system. When not gripping, the push-pull electromagnet is not energized. When gripping the steel bar, the left and right grippers are pressed against the steel bar. The steel bar is squeezed open by the rounded corners at the bottom of the left and right grippers and enters the semi-circular holes. The spring inside the push-pull electromagnet resets the left and right grippers to achieve the gripping of the steel bar. When placing the steel bar, the control system controls the push-pull electromagnet to be energized. The cylinder inside the push-pull electromagnet presses down to separate the left and right grippers, and the steel bar falls down.

[0015] The double-layer conveyor frame is provided with a transition support at each end. Since the double-layer conveyor frame and the lifting frame are two separate mechanisms, there is a certain gap between the two mechanisms, which causes the fixture to be unstable when passing through. The transition support fills the gap between the two mechanisms, so that the fixture can remain stable when transported between the two mechanisms.

[0016] The conveyor chain is equipped with a damping bearing. When the fixture is blocked by the blocking cylinder, the damping bearing will rotate as it passes through the bottom of the fixture, without causing hard friction on the bottom of the fixture, thus reducing the wear caused by friction.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] By combining the double-layer conveyor frame and two jig lifting mechanisms of this invention, multiple jigs can be automatically transported and reused on the double-layer conveyor frame. During the upper layer transport process, the variable-pitch clamping mechanism and the feeding mechanism work together to achieve automatic clamping and feeding, replacing manual placement of steel bars, improving work efficiency and reducing the workload of employees. During the upper layer transport process, the workpiece is finally removed from the jig through other processing steps, and the jig is recycled from the lower layer to the upper layer for reuse through the jig lifting mechanism, realizing the automatic recycling function of jigs and ultimately achieving automated production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is the front view of the present invention.

[0021] Figure 3 This is the left view of the present invention.

[0022] Figure 4 This is the right view of the present invention.

[0023] Figure 5 This is a top view of the present invention.

[0024] Figure 6 This is the rear-view axonometric drawing of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the feeding funnel and the sliding working plate of the fixture in the feeding mechanism of the present invention.

[0026] Figure 8 This is a schematic diagram of the fixture lifting mechanism in this invention.

[0027] Figure 9 This is one of the structural schematic diagrams of the variable-pitch clamping mechanism in this invention.

[0028] Figure 10This is the second schematic diagram of the variable-pitch clamping mechanism in this invention.

[0029] Figure 11 This is a schematic diagram of the steel bar gripper structure in this invention.

[0030] Figure 12 This is a schematic diagram of the structure of the lower conveyor chain and the upper conveyor chain in this invention.

[0031] In the diagram: 1. Lifting frame; 2. Contact switch; 3. Fixture; 4. Gripper frame; 5. Feeding hopper; 6. Steel bar drop trough; 7. Linear guide rail; 8. Gripper through-slot; 9. Steel bar trough; 10. Fixture sliding work plate; 11. Blocking cylinder; 12. Fixture guide rail; 13. Conveyor chain; 14. Upper drive motor; 15. Upper drive shaft; 16. Drive gear; 17. Double-layer conveyor frame; 18. Fixture lifting cylinder; 19. Lower drive shaft; 20. Driven gear; 21. Rotary motor; 22. Lead screw; 23. Nut seat; 24. Gripper guide rail; 25. Telescopic hinge; 6. Gripper slider; 27. Push-pull electromagnet; 28. Feeding cylinder; 29. ​​Lower drive motor; 30. Ear plate; 31. Damping bearing; 32. Left gripper; 33. Right gripper; 34. Semicircular hole; 35. Synchronous pulley; 36. Guide shaft; 37. Synchronous belt; 38. Gripper lifting cylinder; 39. Gripper lifting cylinder moving block; 40. Synchronous belt pressure plate; 41. Mounting plate; 42. Servo motor; 43. Fixture lifting bracket; 44. Conveyor belt motor; 45. Conveyor belt; 46. Cylinder support plate; 47. Cylinder front seat; 48. Slider; 49. Baffle; 50. Transition support. Detailed Implementation

[0032] Example 1

[0033] like Figures 1-12As shown, the recyclable jig and steel bar gripping device of the present invention includes a control system and a double-layer conveyor frame 17. The double-layer conveyor frame 17 is equipped with several blocking cylinders 11. A jig lifting mechanism is provided at both ends of the double-layer conveyor frame 17. A variable-pitch clamping mechanism is provided on the double-layer conveyor frame 17. A feeding mechanism cooperating with the variable-pitch clamping mechanism is provided at the rear of the double-layer conveyor frame 17. The feeding mechanism, variable-pitch clamping mechanism, jig lifting mechanism, and blocking cylinders 11 are all connected to the control system. The double-layer conveyor frame 17 is equipped with... The system includes a lower drive motor 29 and an upper drive motor 14, which are respectively connected to a lower drive shaft 19 and an upper drive shaft 15. Both the lower drive shaft 19 and the upper drive shaft 15 are equipped with drive gears 16. The double-layer conveyor frame 17 also has driven gears 20 that mesh with the drive gears 16. A conveyor chain 13 is wound around both the meshing drive gears 16 and driven gears 20, and the conveyor chains 13 are all covered by fixture guide rails 12. The feeding mechanism includes a funnel... The bucket frame is fixedly connected to a feeding funnel 5, a feeding cylinder 28, and two linear guide rails 7. A fixture sliding work plate 10 is slidably connected to the two linear guide rails 7 via a slider 48. The fixture sliding work plate 10 has several longitudinally arranged steel bar grooves 9 and two transversely arranged gripper grooves 8. The bottom of the feeding funnel 5 has steel bar drop grooves 6 corresponding to the steel bar grooves 9. A baffle 49 is provided on the rear side of the fixture sliding work plate 10. The feeding cylinder 28 is connected to the fixture sliding work plate 10 via a cylinder front seat 47. The work plate 10 is fixedly connected, and the feeding cylinder 28 is connected to the control system. Several steel bars are placed in the feeding funnel 5. The steel bars are screened by the steel bar drop groove 6 at the bottom of the material funnel and leveled so that they fall into the steel bar groove 9 on the sliding work plate 10 of the fixture. Then, the cylinder pushes them to the working position of the variable pitch clamping mechanism to wait for the steel bars to be clamped. Then, this action is repeated and cooperates with the variable pitch clamping mechanism to realize the automatic feeding function. A baffle 49 is provided on the rear side of the sliding work plate 10 of the fixture to prevent the steel bars in the feeding funnel 5 from falling continuously when pushed out.The fixture lifting mechanism includes a lifting frame 1, on which a cylinder support plate 46 is fixedly connected. A fixture lifting cylinder 18, penetrating the cylinder support plate 46, is fixedly connected to the cylinder support plate 46. A fixture lifting bracket 43 is fixedly connected to the cylinder rod of the fixture lifting cylinder 18. A conveyor belt motor 44 is mounted on the fixture lifting bracket 43, and a conveyor belt 45 is connected to the conveyor belt motor 44. A contact switch 2 is mounted on the fixture lifting bracket 43. Both the contact switch 2 and the lifting cylinder are connected to the conveyor belt motor 44. When the fixture 3 enters the fixture lifting bracket 43 and touches the contact switch 2, the... The touch switch 2 sends a signal to the conveyor belt motor 44 to stop operating, and at the same time, the fixture lifting cylinder 18 starts to rise or fall. When the fixture lifting cylinder 18 reaches its maximum or minimum stroke, it sends a signal to the conveyor belt motor 44 to start reversing, and the fixture 3 is transported to the double-layer conveyor frame 17 via the conveyor belt 45. After the fixture 3 is successfully delivered, the fixture lifting bracket 43 resets and repeats this action to achieve automatic lifting and transport of the fixture 3. The variable pitch clamping mechanism includes a gripper frame 4, on which a guide shaft 36 and a gripper front and rear drive assembly are fixedly connected. A slidable moving block 39 for the gripper lifting cylinder is connected to the gripper 6. A gripper lifting cylinder 38 and a synchronous belt pressure plate 40 are fixedly connected to the gripper lifting cylinder moving block 39. The synchronous belt pressure plate 40 is connected to the gripper's front and rear drive assembly. The cylinder rod of the gripper lifting cylinder 38 passes through the gripper lifting cylinder moving block 39 and is fixedly connected to a pitch-changing assembly. Several steel bar grippers are slidably connected to the pitch-changing assembly. The gripper's front and rear drive assembly, the gripper lifting cylinder 38, and the steel bar grippers are all connected to the control system. The front and rear drive assembly drives the gripper lifting cylinder moving block 39 to reciprocate back and forth on the guide shaft 36. When the steel bar... When the gripper moves to the position for gripping or placing the steel bar, the gripper lifting cylinder 38 drives the pitch-changing assembly to descend or rise, thereby driving the steel bar gripper to rise or fall to achieve the gripping and placement of the steel bar; the gripper front and rear drive assembly includes a servo motor 42, the servo motor 42 is connected to a synchronous pulley 35 via a synchronous belt 37, the synchronous belt pressure plate 40 is connected to the synchronous belt 37, the servo motor 42 is connected to the control system, and the synchronous belt pressure plate 40 moves with the synchronous belt 37 by meshing with the teeth on the synchronous belt 37, thereby driving the pitch-changing assembly to move back and forth;The variable pitch assembly includes a mounting plate 41 fixedly connected to the cylinder rod of the gripper lifting cylinder 38. A rotary motor 21 is fixedly connected to the bottom of the mounting plate 41. The rotary motor 21 is connected to a lead screw 22, and a nut seat 23 is connected to the lead screw 22. An ear plate 30 is fixedly connected to each end of the mounting plate 41. A gripper guide rail 24 is fixedly connected between the two ear plates 30. Several gripper sliders 26 are slidably connected to the gripper guide rail 24. Two steel bar grippers are connected to each gripper slider 26. Each gripper slider 26 is connected to the other by a telescopic hinge 25. The left-end gripper slider 26 is fixed to the nut seat 23. The rotary motor 21 is connected to the control system. The rotation of the rotary motor 21 drives the nut seat 23 to move on the lead screw 22, thereby driving the gripper slider 26, which is fixedly connected to the nut seat 23, to move on the gripper guide rail 24. Through the telescopic hinge 25, each gripper slider 26 connected to it moves synchronously, thus achieving variable pitch of the gripper. The steel bar gripper includes a left gripper 32 and a right gripper 33. Both the left and right grippers 32 and 33 are provided with semi-circular holes 34 adapted to the steel bar. The upper ends of the left and right grippers 32 and 33 are hinged to a right push-pull electromagnet 27. The push-pull electromagnet 27 and the gripper slider 26... The conveyor is fixedly connected, with rounded corners at the lower ends of the left and right grippers 32 and 33. The push-pull electromagnet 27 is connected to the control system. When not clamping, the push-pull electromagnet 27 is not energized. When clamping a steel bar, the left and right grippers are pressed against the bar, and the bar is squeezed open by the rounded corners at the bottom of the grippers, entering the semi-circular hole 34. The spring inside the push-pull electromagnet 27 resets the grippers, thus clamping the steel bar. When placing a steel bar, the control system energizes the push-pull electromagnet 27, causing the cylinder inside to press down, separating the grippers and allowing the steel bar to fall. This is the double-layer conveyor. Each end of the frame 17 is provided with a transition support 50. Since the double-layer conveyor frame 17 and the lifting frame 1 are two separate mechanisms, there is a certain gap between the two mechanisms, which causes the fixture 3 to be unstable when passing through. The transition support 50 fills the gap between the two mechanisms, so that the fixture 3 can remain stable when transported between the two mechanisms. The conveyor chain 13 is provided with a damping bearing 31. Through the damping bearing 31, when the fixture 3 is blocked by the blocking cylinder 11, the damping bearing 31 will rotate as it passes through the bottom of the fixture 3, without hard friction on the bottom of the fixture 3, which can reduce the wear caused by friction.

[0034] Working process or working principle:

[0035] During operation, several steel bars are placed in the feeding hopper 5. The steel bars are screened and leveled by the steel bar drop trough 6 at the bottom of the hopper, allowing them to fall into the steel bar groove 9 on the sliding working plate 10 of the fixture. The feeding cylinder 28, controlled by the control system, pushes the steel bars to the working position of the steel bar gripper, waiting for them to be picked up. This action is repeated, cooperating with the steel bar gripper to achieve automatic feeding. A baffle 49 is provided on the rear side of the sliding working plate 10 to prevent the steel bars in the feeding hopper 5 from falling continuously when pushed out. Then, the servo motor 42 of the control system starts, thereby driving the mounting plate 41 to move to the sliding working plate 10 of the fixture. Simultaneously with the exit position, the rotary motor 21 starts, moving the nut seat 23 to move each gripper slider 26 until the distance between them and the steel strip groove 9 on the fixture sliding work plate 10 is the same. Then, the gripper lifting cylinder 38 pushes out, causing the mounting plate 41 to descend, pressing the left and right grippers against the steel strip. The steel strip is squeezed open by the rounded corners at the bottom of the left and right grippers and enters the semi-circular hole 34. The spring inside the push-pull electromagnet 27 resets the left and right grippers, thus clamping the steel strip. Afterward, the gripper lifting cylinder 38, rotary motor 21, and servo motor 42 are adjusted to move the clamped steel strip above the fixture 3. The gripper lifting cylinder 38 descends further, and the control system energizes the push-pull electromagnet 27. The cylinder inside the push-pull electromagnet 27 presses down, causing the left and right grippers to separate. The steel bar then falls onto the fixture 3. The fixture 3, carrying the steel bar, undergoes multiple processing steps during its transport on the upper layer of the double-layer conveyor frame 17, finally removing the workpiece. The fixture 3 is then transported on the upper layer to the fixture lifting bracket 43 at the right end and touches the contact switch 2. The contact switch 2 transmits a signal to the conveyor belt motor 44 to stop operating. Simultaneously, the fixture lifting cylinder 18 begins to descend. When the fixture lifting cylinder 18 reaches its minimum stroke, it transmits a signal to the conveyor belt motor 44 to stop operating. The conveyor motor 44 starts to work in reverse, and the jig 3 is transported to the lower layer of the double-layer conveyor frame 17 via the conveyor belt 45. After the jig 3 is successfully delivered, the jig 3, after being transported from the lower layer, reaches the jig lifting bracket 43 at the left end. The process is the same as that of the jig 3 being transported downwards at the right end, and the jig 3 is sent to the upper layer of the double-layer conveyor frame 17. The jig lifting bracket 43 is reset and this action is repeated to realize the automatic lifting and transportation of the jig 3, thereby realizing the recycling of the jig 3. Similarly, the steel bar clamping and feeding action is performed to clamp and place steel bars on the new jig 3 to realize the automatic cycle of steel bar clamping.

[0036] Through the cooperation of the double-layer conveyor frame 17 and two jig lifting mechanisms of the present invention, multiple jigs 3 can be automatically transported and repeatedly used on the double-layer conveyor frame 17. During the upper layer transport process, the variable pitch clamping mechanism and the feeding mechanism are used to realize automatic clamping and feeding, which replaces the manual placement of steel bars, improves work efficiency, and reduces the workload of employees. During the upper layer transport process, the workpieces on the jigs 3 are finally removed through other processing processes, and the jigs 3 are recycled from the lower layer to the upper layer for reuse through the jig lifting mechanism, realizing the automatic recycling function of jigs 3, and finally realizing automated production.

[0037] The descriptions of the orientation and relative positional relationships of the structures in this invention, such as front, back, left, right, up, and down, do not constitute a limitation of this invention, but are merely for the convenience of description.

Claims

1. A steel bar conveying device, characterized in that: The system includes a control system and a double-layer conveyor frame (17). The double-layer conveyor frame (17) is equipped with several blocking cylinders (11). Both ends of the double-layer conveyor frame (17) are equipped with a jig lifting mechanism. The double-layer conveyor frame (17) is equipped with a variable-pitch clamping mechanism. The double-layer conveyor frame (17) is equipped with a feeding mechanism that cooperates with the variable-pitch clamping mechanism at the rear. The feeding mechanism, variable-pitch clamping mechanism, jig lifting mechanism and blocking cylinders (11) are all connected to the control system. The double-layer conveyor frame (17) is equipped with a lower drive motor (29) and an upper drive motor. The motor (14), the lower drive motor (29) and the upper drive motor (14) are respectively connected to the lower drive shaft (19) and the upper drive shaft (15). The lower drive shaft (19) and the upper drive shaft (15) are both equipped with drive gears (16). The double-layer conveyor frame (17) is also equipped with driven gears (20) that cooperate with the drive gears (16). The drive gears (16) and driven gears (20) that cooperate with each other are both wrapped with conveyor chains (13). The conveyor chains (13) are all covered by the fixture guide rail (12). The feeding mechanism includes a feeding funnel (5), a feeding cylinder (28), and two linear guide rails (7). A fixture sliding working plate (10) is slidably connected to the two linear guide rails (7) via a slider (48). The fixture sliding working plate (10) has several steel bar grooves (9) arranged longitudinally and two gripper through grooves (8) arranged laterally. The bottom of the feeding funnel (5) has a steel bar drop groove (6) corresponding to the steel bar grooves (9). A baffle (49) is provided on the rear side of the fixture sliding working plate (10). The feeding cylinder (28) is fixedly connected to the fixture sliding working plate (10) via a cylinder front seat (47). The feeding cylinder (28) is connected to the control system. The fixture lifting mechanism includes a lifting frame (1), a cylinder support plate (46) is fixedly connected to the lifting frame (1), a fixture lifting cylinder (18) that passes through the cylinder support plate (46) is fixedly connected to the cylinder support plate (46), a fixture lifting bracket (43) is fixedly connected to the cylinder rod of the fixture lifting cylinder (18), a conveyor belt motor (44) is provided on the fixture lifting bracket (43), a conveyor belt motor (44) is connected to the conveyor belt (45), a contact switch (2) is provided on the fixture lifting bracket (43), and both the contact switch (2) and the fixture lifting cylinder (18) are connected to the conveyor belt motor (44). The variable pitch clamping mechanism includes a gripper frame (4), a guide shaft (36) and a gripper front and rear drive assembly are fixedly connected to the gripper frame (4), a gripper lifting cylinder moving block (39) is slidably connected to the guide shaft (36), a gripper lifting cylinder (38) and a synchronous belt pressure plate (40) are fixedly connected to the gripper lifting cylinder moving block (39), the synchronous belt pressure plate (40) is connected to the gripper front and rear drive assembly, the cylinder rod of the gripper lifting cylinder (38) passes through the gripper lifting cylinder moving block (39) and is fixedly connected to a variable pitch assembly, a number of steel bar grippers are slidably connected to the variable pitch assembly, and the gripper front and rear drive assembly, the gripper lifting cylinder (38) and the steel bar grippers are all connected to the control system; The gripper front and rear drive assembly includes a servo motor (42), which is connected to a synchronous pulley (35) via a synchronous belt (37). The synchronous belt pressure plate (40) is connected to the synchronous belt (37), and the servo motor (42) is connected to the control system. The variable pitch assembly includes a mounting plate (41) fixedly connected to the cylinder rod of the gripper lifting cylinder (38). A rotary motor (21) is fixedly connected to the bottom of the mounting plate (41). A lead screw (22) is connected to the rotary motor (21). A nut seat (23) is connected to the lead screw (22). An ear plate (30) is fixedly connected to both ends of the mounting plate (41). A gripper guide rail (24) is fixedly connected between the two ear plates (30). Several gripper sliders (26) are slidably connected to the gripper guide rail (24). Two steel bar grippers are connected to each gripper slider (26). Each gripper slider (26) is connected to each other by a telescopic hinge (25). The left gripper slider (26) is fixedly connected to the nut seat (23). The rotary motor (21) is connected to the control system. The steel bar gripper includes a left gripper (32) and a right gripper (33). Both the left gripper (32) and the right gripper (33) are provided with semi-circular holes (34) that are adapted to the steel bar. The upper ends of the left gripper (32) and the right gripper (33) are hinged to a right push-pull electromagnet (27). The push-pull electromagnet (27) is fixedly connected to the gripper slider (26). The lower ends of the left gripper (32) and the right gripper (33) are provided with rounded corners. The push-pull electromagnet (27) is connected to the control system. The double-layer conveyor frame (17) is provided with a transition support (50) at each end; The conveyor chain (13) is equipped with a damping bearing (31).

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