Automatic feeding device and feeding method for punching machine

Abstract

The automatic feeding device comprises a feeding mechanism installed on the side face of the punching machine and a positioning mechanism installed on the front face of the punching machine, the feeding mechanism comprises a feeding sliding way and a material pushing air cylinder located in the feeding sliding way, and a push plate is vertically arranged on a piston rod of the material pushing air cylinder; therefore, the workpieces are pushed and fed towards the stamping machining position along the material pushing slide way. The positioning mechanism is composed of a chain, a guide rod, a guide base, a spring, a positioning block and the like, and secondary positioning is conducted on the workpiece pushed to the stamping machining position. In the feeding pushing direction, a discharging sliding way is arranged on the other side of the stamping machining position, and the machined workpieces are pushed out along the discharging sliding way by means of the pushing force transmitted between the workpieces. Workpieces are automatically fed into the machining area of the punching equipment to be machined and automatically discharged, industrial accidents caused by the fact that the hands of workers stretch into a punching machine are avoided, the production industrial injury rate is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to a feeding device, in particular to an automatic feeding device and a feeding method for a punching machine. Background Art

[0002] Stamping is an efficient, high-precision, and widely applicable metal processing technology. Existing highly automated machine tools have the function of automatically identifying workpieces, and can stop stamping in time through the automatic control system, which protects the operator. For some specific parts, traditional punching machines are still needed, and manual feeding is required for processing, which can easily lead to dangers if not handled with caution. Although safety gratings can be added on both sides of the slider movement area to ensure that the operator will not press until he leaves the stamping area, it will reduce production efficiency.

[0003] The invention with the authorization announcement number CN 221184470 U discloses a stamping automatic feeding device, including: a feeding mechanism, the feeding mechanism is used to realize automatic feeding of the workpiece to be processed; a stamping platform, the stamping platform is used to place the workpiece for stamping; a workbench, the workbench is used to install the feeding mechanism and the stamping platform; and also includes: a positioning mechanism, the positioning mechanism includes a block, a bracket, a telescopic rod and a positioning plate, three blocks are arranged on the front and rear sides and the right side of the stamping platform, the telescopic rod is fixed to the top of the block through the bracket, and the output end of the telescopic rod faces the center of the stamping platform and is fixedly connected to the positioning plate; wherein the positioning mechanism is arranged on the stamping platform, after the feeding mechanism sends the workpiece to the stamping platform, the output ends of the three telescopic rods extend to drive the positioning plate to move toward the center of the stamping platform, adjust the position of the workpiece, and avoid the workpiece from shifting on the stamping platform. However, it can only complete automatic feeding, and cannot realize automatic discharging, so the application scope is limited, and the production efficiency is reduced. Summary of the invention

[0004] The present invention provides an automatic feeding device and feeding method for a punching machine, which enables feeding, punching processing and discharging to be completed automatically, thus avoiding harm to personnel, and greatly improving the feeding efficiency and production efficiency.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An automatic feeding device for a stamping machine comprises a feeding mechanism installed on the side of the stamping machine and a positioning mechanism installed on the front of the stamping machine, the feeding mechanism comprises a feeding slide extending in the left and right directions and a pushing cylinder located in the feeding slide, a pushing plate is vertically provided on the piston rod of the pushing cylinder, so as to push the workpiece along the pushing slide to the stamping processing position for feeding, the positioning mechanism comprises an upper plate seat, a positioning block, a spring, a guide rod, a guide seat, a supporting wheel, a chain, a positioning base plate, a positioning block guide seat and a supporting wheel fixing seat, the guide seat, the supporting wheel fixing seat and the positioning block guide seat are all fixed on the positioning base plate, the supporting wheel is fixed on the supporting wheel fixing seat through a shaft, and the upper plate seat is vertically fixed on the slider of the stamping machine The upper end of the chain is hinged to the connecting column, and the lower end of the chain bypasses the supporting wheel and the guide rod and extends out of the guide seat, and the positioning block is limited in the positioning block guide seat and moves back and forth with the drive of the chain, so as to perform secondary positioning of the workpiece pushed to the stamping processing position (improve the stamping processing accuracy). Along the feeding direction, a discharge chute is provided on the other side of the stamping processing position, and one end of the discharge chute is connected to the feeding chute through a connecting groove to form a stamping processing position in the connecting groove. A blanking plate is provided at the other end of the discharge chute.

[0006] Furthermore, the feeding chute and the discharging pipe are both composed of a chute bottom plate with a groove (to ensure the installation accuracy of the chute) and two relatively arranged L-shaped angle steels. A chute is formed between the two relatively arranged L-shaped angle steels. The two L-shaped angle steels are respectively pressed on the edges on both sides of the groove of the chute bottom plate by a number of clamping blocks. The chute bottom plate of the feeding chute is fixed on the feeding chute base, and the chute bottom plate, positioning bottom plate and connecting groove of the discharging chute are all fixed on the lower template of the punching machine. Furthermore, a rear top plate is provided at the right end of the feeding slide, and an adjustment top screw is passed through the rear top plate. The left end of the adjustment top screw is connected to the top of the pushing cylinder, which is used to adjust the position of the pushing cylinder along the direction of the feeding slide, so that the pushing cylinder pushes the workpiece to stop accurately at the predetermined position of the stamping process.

[0007] Furthermore, the upper end surfaces of the clamping blocks on both sides of the push cylinder are provided with pressure plates, and the pressure plates are provided with fastening bolts, and the lower ends of the fastening bolts are against the push cylinder to clamp and fix the push cylinder.

[0008] Furthermore, a brush is provided above the feeding slide on the left side of the pushing cylinder. The brush and the bottom surface of the feeding slide are arranged opposite to each other. The brush is fixed on the clamping blocks on both sides of the feeding slide. The friction generated between the brush and the workpiece is used to prevent the workpiece from moving in the slide. The moving distance is not controllable due to inertia, thereby ensuring that the workpiece moves the same distance each time.

[0009] Furthermore, a magnetic switch for detecting whether the cylinder is extended into position and a magnetic switch for detecting whether the cylinder is retracted into position are installed on the pushing cylinder.

[0010] Furthermore, a gasket and a nut are provided on one end of the guide rod extending out of the guide seat and on one end connected to the positioning block.

[0011] Furthermore, a notch is provided at one end of the positioning block facing the stamping processing position to better guide the workpiece.

[0012] Furthermore, the unloading plate is provided with a unloading chute corresponding to the chute of the unloading chute.

[0013] Furthermore, a notch is provided on a side of the connection groove away from the positioning mechanism to facilitate observation of the stamping processing position.

[0014] The method of feeding using the above-mentioned automatic feeding device of the punching machine is as follows: (1) The magnetic switch on the push cylinder and the cam controller of the press slide are connected to the PLC control system so that the logical relationship between the action of the push cylinder and the punching action of the punch on the press slide is controlled by the PLC control system. After the workpiece is manually placed in the feeding slide, the PLC control system simultaneously receives the signal that the push cylinder has retracted into position and the press slide is at the top dead center. By stepping on the foot switch, the push cylinder extends and pushes the workpiece through the push plate, so that the workpiece in the feeding slide moves to the stamping processing position. When the push cylinder is extended into position, the workpiece moves to the predetermined position. When the PLC control system receives the signal from the magnetic switch that the push cylinder is extended into position, it controls the push cylinder to retract and return to position, and at the same time gives the press a downward command. At the same time, the press slide is pressed down, the tension on the chain disappears, and the spring pushes the positioning block to extend toward the stamping processing position, pushing the workpiece, and performing secondary correction on the workpiece. (2) After the stamping action is completed, the punching machine slider moves up, and the upper plate seat drives the chain to pull the positioning block. When the punching machine slider is at the top dead center, the chain is tightened and drives the positioning block to withdraw away from the stamping processing position. At the same time, a new workpiece is placed in the feeding slide. When the PLC control system simultaneously receives the signal that the push cylinder has retracted into place and the punching machine slider is at the top dead center, the foot switch is stepped on, and the push cylinder pushes the new workpiece to the predetermined position, thereby displacing the previous workpiece by a distance of the length of the workpiece. The workpiece that has completed stamping is pushed out along the discharge slide by relying on the thrust transmitted between the workpieces, and is sent out through the unloading plate and the conveyor belt arranged under the unloading plate.

[0015] When in use, the logical relationship between the action of the push plate and the punching action of the punch of the punching machine during the working process of the feeding device is controlled by the PLC. A magnetic switch is installed on the push cylinder to detect whether the cylinder is extended and retracted. When the PLC receives the signal that the cylinder is retracted and the punch slide is at the top dead center at the same time, the push plate will be extended to push the workpiece by stepping on the foot switch. When the PLC receives the signal that the cylinder is extended, it controls the cylinder to retract and return to its original position, and at the same time gives the punch press a downward pressure command to complete the punching action.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The feed chute and the discharge chute are connected by a connecting groove, and can be used to guide the workpiece. During the stamping process, the upper die punches the material core separated by stamping into the lower die, and it comes out along the discharge hole at the bottom of the stamping machine bottom plate. The workpiece after stamping is demoulded by the elastic stripper installed on the upper and lower dies to prevent the workpiece from being stuck on the die core. In order to facilitate the workpiece along the discharge chute, the thrust of the push cylinder transmitted between the workpieces is used to push the stamped workpiece along the discharge chute.

[0017] The present invention realizes automatic delivery of workpieces into the processing area of ​​the punching equipment for processing and automatic discharge, so as to avoid industrial accidents caused by workers putting their hands into the punching machine, reduce the production injury rate and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic structural diagram of the present invention; Figure 2 It is a structural diagram of the feeding mechanism; Figure 3 It is a structural schematic diagram of the positioning mechanism; Figure 4 It is a connection position diagram of the connection trough and the feeding slideway, the discharging slideway and the positioning mechanism; In the figure: 1. Adjusting top screw; 2. Rear top plate; 3. Pushing cylinder; 4. Pressing plate; 5. Pushing plate; 6. Feeding slide; 7. Clamping block; 8. Brush; 9. Feeding slide bottom plate; 10. Feeding slide base; 11. Punching machine; 111. Sliding block; 112. Lower template; 12. Upper plate seat; 121. Connecting column; 13. Stamping processing position; 14. Discharging slide; 15. Positioning block; 16. Spring; 17. Guide rod; 18. Guide seat; 19. Support wheel; 20. Chain; 21 Positioning bottom plate; 22. Connecting groove; 23. Positioning block guide seat; 24. Support wheel fixing seat; 25. Discharging slide bottom plate; 26. L-shaped angle steel, 27. Discharging plate. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be fully described below in conjunction with the accompanying drawings.

[0020] An automatic feeding device for a punching machine, such as Figures 1 to 4As shown, it includes a feeding mechanism installed on the side of the punching machine 11 and a positioning mechanism installed on the front of the punching machine, the feeding mechanism includes a feeding slide 6 extending in the left and right directions and a pushing cylinder 3 located in the feeding slide 6, a pushing plate 5 is vertically provided on the piston rod of the pushing cylinder 3, so as to push the workpiece along the pushing slide 6 to the stamping processing position 13 for feeding, the positioning mechanism includes an upper plate seat 12, a positioning block 15, a spring 16, a guide rod 17, a guide seat 18, a supporting wheel 19, a chain 20, a positioning base plate 21, a positioning block guide seat 23 and a supporting wheel fixing seat 24, the guide seat 18, the supporting wheel fixing seat 24 and the positioning block guide seat 23 are all fixed on the positioning base plate 21, the supporting wheel 19 is fixed on the supporting wheel fixing seat 24 through an axis, the upper plate seat 12 is vertically fixed on the slider 111 of the punching machine 11, and extends A connecting column 121 extending downward is provided at the outlet end, one end of the guide rod 17 passes through the guide seat 18, the other end of the guide rod 17 is sleeved with a spring 16 and the end is fixedly connected to the positioning block 15, the upper end of the chain 20 is hinged to the connecting column 121, and the lower end of the chain 20 bypasses the support wheel 19 and the guide rod 17 and extends out of the guide seat 18, and is hinged, the positioning block 15 is limited in the positioning block guide seat 23 and moves back and forth with the drive of the chain 20, so as to perform secondary positioning on the workpiece pushed to the stamping processing position 13, and along the feeding advancement direction, a discharge chute 14 is provided on the other side of the stamping processing position 13, one end of the discharge chute 14 is connected to the feeding chute 6 through a connecting groove 22, and the stamping processing position 13 is formed in the connecting groove 22, and the other end of the discharge chute 14 is hinged with a blanking plate 27 through a hinge.

[0021] The feeding chute 6 is composed of a feeding chute bottom plate 9 with a trough and two L-shaped angle steels 26 arranged oppositely, and the discharging pipe is composed of a discharging chute bottom plate 25 with a trough and two L-shaped angle steels 26 arranged oppositely, and a feeding chute and a discharging chute are formed between the two L-shaped angle steels 26 arranged oppositely, and the pushing cylinder 3 is located in the feeding chute. The L-shaped angle steels 26 are respectively pressed on the sides of the trough of the feeding chute bottom plate 9 or the discharging chute bottom plate 25 by a plurality of pressing blocks 7, and the feeding chute bottom plate 9 is fixed on the feeding chute base 10, and the discharging chute bottom plate 25, the positioning bottom plate 21 and the connecting groove 22 are all fixed on the lower template 112 of the punching machine. A rear top plate 2 is provided at the right end of the feeding chute 6, and an adjusting top screw 1 is passed through the rear top plate 2. The left end of the adjusting top screw 1 is connected to the pushing cylinder 3, which is used to adjust the position of the pushing cylinder 3 along the direction of the feeding chute 6, so that the pushing cylinder 3 pushes the workpiece to stop accurately at the predetermined position of the stamping process.

[0022] The upper end surfaces of the pressing blocks 7 on both sides of the push cylinder 3 are provided with pressing plates 4, and the pressing plates 4 are provided with fastening bolts. The lower ends of the fastening bolts abut against the push cylinder 3 to press and fix the push cylinder 3.

[0023] A brush 8 is provided above the feeding slide 6 on the left side of the pushing cylinder 3 , the brush 8 and the bottom surface of the feeding slide are arranged opposite to each other, and the brush 8 is fixed on the pressing blocks on both sides of the feeding slide 6 .

[0024] The push cylinder 3 is provided with a magnetic switch for detecting whether the cylinder is extended into position and a magnetic switch for detecting whether the cylinder is retracted into position.

[0025] The end of the guide rod 17 extending out of the guide seat 18 and the end connected to the positioning block 15 are both provided with a gasket and a nut.

[0026] The end of the positioning block 15 facing the stamping processing position 13 is provided with notches of different shapes according to the characteristics of the workpiece to better guide the workpiece, such as semicircular, elliptical, W-shaped, and V-shaped. In the present application, the end of the positioning block 15 facing the stamping processing position 13 is provided with a V-shaped notch.

[0027] A notch is provided on one side of the connection groove 22 away from the positioning mechanism to form an observation window for conveniently observing the condition of the stamping processing position 13 .

[0028] The unloading plate 27 is provided with an unloading chute corresponding to the chute of the unloading chute 14 .

[0029] The method of feeding using the above-mentioned automatic feeding device of the punching machine is as follows: (1) The magnetic switch on the push cylinder 3 and the cam controller of the punch slide 111 are connected to the PLC control system so that the logical relationship between the action of the push cylinder 3 and the punching action of the punch on the punch slide 111 is controlled by the PLC control system. After the workpiece is manually placed in the feeding slide 6, the PLC control system simultaneously obtains the signal that the push cylinder 3 is retracted and the punch slide 111 is at the top dead center. The foot switch is stepped on, the push cylinder 3 extends, and the workpiece is pushed by the push plate 5, so that the workpiece in the feeding slide 6 moves to the stamping processing position 13. When the push cylinder 3 is extended into position, the workpiece moves to the predetermined position. When the PLC control system receives the signal of the magnetic switch that the push cylinder 3 is extended into position, it controls the push cylinder 3 to retract and return to position, and at the same time gives the punch 11 a downward pressing instruction. At the same time, the punch slide 111 is pressed down, the tension on the chain 20 disappears, and the spring 16 pushes the positioning block 15 to extend toward the stamping processing position 13, pushing the workpiece, and performing secondary correction on the workpiece; (2) After the punching action is completed, the punching machine slide 111 moves upward, and the upper plate seat 12 drives the chain 20 to pull the positioning block 15. When the punching machine slide 111 is at the upper dead center, the chain 20 is tightened and drives the positioning block 15 to withdraw in the direction away from the punching processing position 13. At the same time, a new workpiece is placed in the feeding slide 6. When the PLC control system simultaneously receives the signal that the push cylinder 3 has retracted into place and the punching machine slide 111 is at the upper dead center, the foot switch is stepped on, and the push cylinder 3 pushes the new workpiece to move to the predetermined position, thereby displacing the previous workpiece by a distance of the length of the workpiece. The workpiece that has completed the stamping is pushed out along the discharge slide 14 by relying on the thrust transmitted between the workpieces, and is sent out through the unloading plate 27 and the conveyor belt arranged under the unloading plate 27.

[0030] It should be noted that the embodiments described above are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. An automatic feeding device for a punching machine, characterized in that: It includes a feeding mechanism installed on the side of the punching machine and a positioning mechanism installed on the front of the punching machine. The feeding mechanism includes a feeding slide extending in the left and right directions and a pushing cylinder located in the feeding slide. A pushing plate is vertically arranged on the piston rod of the pushing cylinder, so as to push the workpiece along the pushing slide to the stamping processing position for feeding. The positioning mechanism includes an upper plate seat, a positioning block, a spring, a guide rod, a guide seat, a supporting wheel, a chain, a positioning base plate, a positioning block guide seat and a supporting wheel fixing seat. The guide seat, the supporting wheel fixing seat and the positioning block guide seat are all fixed on the positioning base plate. The supporting wheel is fixed on the supporting wheel fixing seat through a shaft. The upper plate seat is vertically fixed on the slider of the punching machine. The protruding end is provided with a connecting column extending downward, one end of the guide rod passes through the guide seat, the other end of the guide rod is sleeved with a spring and the end is fixedly connected to the positioning block, the upper end of the chain is hinged to the connecting column, the lower end of the chain bypasses the supporting wheel and the guide rod and extends out of one end of the guide seat, the positioning block is limited in the positioning block guide seat and moves back and forth driven by the chain, so as to perform secondary positioning on the workpiece pushed to the stamping processing position, along the feeding direction, a discharging chute is provided on the other side of the stamping processing position, one end of the discharging chute is connected to the feeding chute through a connecting groove, and a stamping processing position is formed in the connecting groove, and a blanking plate is provided at the other end of the discharging chute.

2. The automatic feeding device for a punching machine according to claim 1, characterized in that: The feeding chute and the discharging pipe are both composed of a chute bottom plate with a sink groove and two oppositely arranged L-shaped angle steels. A chute is formed between the two oppositely arranged L-shaped angle steels. The two L-shaped angle steels are respectively pressed on the edges on both sides of the sink groove of the chute bottom plate by a number of clamping blocks. The chute bottom plate of the feeding chute is fixed on the feeding chute base, and the chute bottom plate, positioning bottom plate and connecting groove of the discharging chute are all fixed on the lower template of the punching machine.

3. The automatic feeding device for a punching machine according to claim 1, characterized in that: A rear top plate is provided at the right end of the slide bottom plate of the feeding slide, and an adjusting top screw is passed through the rear top plate. The left end of the adjusting top screw is connected to the top of the pushing cylinder, which is used to adjust the position of the pushing cylinder along the direction of the feeding slide, so that the pushing cylinder pushes the workpiece to stop accurately at the predetermined position of the stamping process.

4. The automatic feeding device for a punching machine according to claim 2, characterized in that: The upper end surfaces of the pressing blocks on both sides of the push cylinder are provided with pressing plates, and fastening bolts are arranged on the pressing plates. The lower ends of the fastening bolts abut against the push cylinder to press and fix the push cylinder.

5. The automatic feeding device for a punching machine according to claim 2, characterized in that: A brush is arranged above the feeding slideway on the left side of the push cylinder. The brush and the bottom surface of the feeding slideway are arranged opposite to each other. The brush is fixed on the pressing blocks on both sides of the feeding slideway.

6. The automatic feeding device for a punching machine according to claim 1, characterized in that: The push cylinder is equipped with a magnetic switch for detecting whether the cylinder is extended into position and a magnetic switch for retracting into position; a notch is provided at one end of the positioning block facing the stamping processing position so as to better guide the workpiece.

7. The automatic feeding device for a punching machine according to claim 1, characterized in that: A gasket and a nut are provided on one end of the guide rod extending out of the guide seat and on the other end connected with the positioning block.

8. The automatic feeding device for a punching machine according to claim 1, characterized in that: The unloading plate is provided with a unloading chute corresponding to the chute of the unloading chute.

9. The automatic feeding device for a punching machine according to claim 1, characterized in that: A notch is provided on one side of the connection groove away from the positioning mechanism so as to facilitate observation of the stamping processing position.

10. A method for feeding materials using the automatic feeding device for a punching machine according to any one of claims 1 to 9, characterized in that: The process is as follows: (1) The magnetic switch on the push cylinder and the cam controller of the press slide are connected to the PLC control system so that the logical relationship between the action of the push cylinder and the punching action of the punch on the press slide is controlled by the PLC control system. After the workpiece is manually placed in the feeding slide, the PLC control system simultaneously receives the signal that the push cylinder has retracted into position and the press slide is at the top dead center. By stepping on the foot switch, the push cylinder extends and pushes the workpiece through the push plate, so that the workpiece in the feeding slide moves to the stamping processing position. When the push cylinder is extended into position, the workpiece moves to the predetermined position. When the PLC control system receives the signal from the magnetic switch that the push cylinder is extended into position, it controls the push cylinder to retract and return to position, and at the same time gives the press a downward command. At the same time, the press slide is pressed down, the tension on the chain disappears, and the spring pushes the positioning block to extend toward the stamping processing position, pushing the workpiece, and performing secondary correction on the workpiece. (2) After the stamping action is completed, the punching machine slider moves up, and the upper plate seat drives the chain to pull the positioning block. When the punching machine slider is at the top dead center, the chain is tightened and drives the positioning block to withdraw away from the stamping processing position. At the same time, a new workpiece is placed in the feeding slide. When the PLC control system simultaneously receives the signal that the push cylinder has retracted into place and the punching machine slider is at the top dead center, the foot switch is stepped on, and the push cylinder pushes the new workpiece to the predetermined position, thereby displacing the previous workpiece by a distance of the length of the workpiece. The workpiece that has completed stamping is pushed out along the discharge slide by relying on the thrust transmitted between the workpieces, and is sent out through the unloading plate and the conveyor belt arranged under the unloading plate.

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