Automatic discharging and waste collecting system for automobile wire harness stamping connecting piece

Abstract

The automatic discharging and waste collecting system is arranged between a punching machine tool and a negative pressure adsorption device and comprises a layered lower die holder, the lower die holder comprises a blanking layer, an upper cavity layer and a lower cavity layer which are sequentially arranged from top to bottom, array micropores are formed in the blanking layer, the micropores in the center area are communicated with the upper cavity layer, and the lower cavity layer is communicated with the lower cavity layer. The micropores in the peripheral area are communicated with the lower cavity layer, the upper cavity layer is isolated from the lower cavity layer, a three-way air valve connected with the upper cavity layer and the lower cavity layer is arranged on one side of the lower die holder, and the three-way air valve is further connected with an air source; the device further comprises a mechanical arm, a main adsorption pipeline and a Venturi pipeline, the mechanical arm is provided with an adsorption module matched with the center area of the blanking layer, the main adsorption pipeline is located at the bottom of the lower cavity layer and connected with the lower cavity layer, and an inlet and a throat part of the Venturi pipeline are connected with the main adsorption pipeline and a centrifugal fan of the negative pressure adsorption device correspondingly. A first flow meter and a second flow meter are respectively arranged at the inlet and the throat part of the Venturi pipeline; and an encoder is also included.

Description

Technical Field

[0001] The present invention relates to the technical field of processing of stamping metal parts, and particularly to an automatic unloading and waste collection system for automotive wire harness stamping connectors. Background Art

[0002] The automatic unloading and waste collection system for automotive wire harness stamping connectors is a post-processing system for automotive wire harness stamping production, and involves the unloading of qualified parts and the collection of waste. An automotive wire harness stamping production line generally includes a stamping machine tool, an unloading device, a waste collection system, a conveying system, and a control system. The stamping machine tool is equipped with a precision die set for manufacturing stamping connectors. The unloading device is equipped with a pneumatic suction cup group and a servo manipulator, and the manipulator drives the pneumatic suction cup group to grab qualified parts. The waste collection system is equipped with a negative pressure adsorption device, a vibrating screen, and a waste temporary storage box. The negative pressure adsorption device is located below the precision die set and can collect blanking waste after being started. The vibrating screen and the negative pressure adsorption device are connected through a sealed pipeline. After the negative pressure adsorption device initially collects the waste, the waste is vertically or horizontally conveyed to the inlet of the vibrating screen through mechanical transmission, forming a continuous waste stream of stamping, adsorption, screening, and temporary storage.

[0003] However, there is asynchrony in the operating rhythms of the servo manipulator of the unloading device and the waste collection system. For example, after the manipulator completes unloading, the start delay of the waste adsorption device causes the stamping machine to wait briefly, resulting in cycle waste. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an automatic unloading and waste collection system for automotive wire harness stamping connectors.

[0005] The technical solution of the present invention is an automatic unloading and waste collection system for automotive wire harness stamping connectors, which is arranged between a stamping machine tool and a negative pressure adsorption device. It includes a layered lower die base. The lower die base includes a blanking layer, an upper cavity layer, and a lower cavity layer arranged in sequence from top to bottom. The blanking layer is provided with an array of micropores. The micropores in the central area communicate with the upper cavity layer, and the micropores in the peripheral area communicate with the lower cavity layer. There is a partition plate between the upper cavity layer and the lower cavity layer. On one side of the lower die base, there is a three-way air valve that is respectively connected to the upper cavity layer and the lower cavity layer, and the three-way air valve is also connected to a gas source; it also includes a robotic arm, a main adsorption pipeline, and a Venturi pipeline. An adsorption module that cooperates with the central area of the blanking layer is provided on the robotic arm. The main adsorption pipeline is located at the bottom of the lower cavity layer and is connected to the lower cavity layer. The inlet and throat of the Venturi pipeline are respectively connected to the main adsorption pipeline and the centrifugal fan of the negative pressure adsorption device. A first flow meter and a second flow meter are respectively provided at the inlet and throat of the Venturi pipeline; it also includes an encoder, which is arranged at the end of the main shaft of the stamping machine tool to detect the rotation angle and real-time stamping frequency of the main shaft. The robotic arm, the centrifugal fan, and the three-way air valve respectively act within the timing stages set according to the encoder. The target speed of the centrifugal fan follows the real-time stamping frequency detected by the encoder, and the speed compensation of the centrifugal fan is generated according to the pressure difference signal detected by the first flow meter and the second flow meter.

[0006] As an implementation manner, a micro switch is embedded in the blanking layer, and the micro switch is triggered when the upper die contacts the lower die base.

[0007] As an implementation manner, an annular air collection groove is opened at the outer periphery of the bottom of the lower cavity layer, and the lower cavity layer is also provided with four connection holes connecting the annular air collection groove and the main adsorption pipeline.

[0008] As an implementation manner, a guide slope is provided on the cavity wall of the lower cavity layer, and the guide slope is inclined downward and faces the annular air collection groove.

[0009] As an implementation manner, the micropores are conical holes, and the diameter of the inlet of the micropores is 1.5 times the diameter of the outlet of the micropores.

[0010] As an implementation manner, an anti-blowing interface is opened on one side of the lower cavity layer.

[0011] As an implementation manner, the centrifugal fan is a permanent magnet synchronous motor direct drive centrifugal fan.

[0012] As an implementation manner, it further includes a carrier. The carrier includes a workbench and guard plates arranged around the workbench. The Venturi pipeline and the centrifugal fan are located within the area surrounded by the guard plates, and the lower die base is fixed on the workbench.

[0013] As an implementation manner, an aggregate table is provided on one side of the carrier.

[0014] As an implementation manner, the robotic arm is a six-axis robotic arm.

[0015] The beneficial effects of the present invention compared with the prior art are as follows. For the automatic unloading and waste collection system of the automotive wire harness stamping connector, the traditional integral lower die base is changed to a three-layer composite structure, including a blanking layer, an upper cavity layer, and a lower cavity layer. Sequentially according to the time sequence stages are the stamping stage, the unloading stage, the waste collection stage, and the transmission stage. In the stamping stage, the upper die descends for stamping and then rises. In this stage, the upper cavity layer is connected to the air source and is in a negative pressure state to provide auxiliary fixation for the workpiece. In the unloading stage, the upper die rises to a position close to the highest position, and the robotic arm quickly positions directly above the lower die base and adsorbs the workpiece upward through the suction of the adsorption module. At this time, the centrifugal fan maintains low-speed operation. In the waste collection stage, the robotic arm moves out of the die area and then places the workpiece on the aggregate table. In this stage, the three-way valve operates to cut off the connection between the upper cavity layer and the air source and instead connect the lower cavity layer to the air source. In this stage, the lower cavity layer is in a negative pressure state, and the waste enters the lower cavity layer through the micropores. At the same time, the centrifugal fan speeds up to the target speed, and a strong suction force generated by the centrifugal fan causes the waste to enter the main adsorption pipeline from the lower cavity layer. The specific value of the target speed is calculated based on the real-time stamping frequency measured by the encoder, enabling the centrifugal fan to perform frequency tracking and forming a closed-loop control. At the same time, the actual flow rate is also calculated by measuring the pressure difference between the inlet and the throat of the Venturi pipeline through the first flowmeter and the second flowmeter, and then the centrifugal fan speed compensation is given according to the comparison relationship between the actual flow rate value and the theoretical value, forming another closed-loop control. In the transmission stage, the waste passes through the main adsorption pipeline, the Venturi pipeline, the centrifugal fan, and finally reaches the vibrating screen. Therefore, the automatic unloading and waste collection system of the automotive wire harness stamping connector forms an overall solution with a double closed-loop control architecture, solves the problem of asynchronous beats, and thus creates space for further shortening the processing cycle. Description of the Drawings

[0016] Figure 1 It is the first structural schematic diagram of the automatic unloading and waste collection system of the automotive wire harness stamping connector provided by the implementation manner of the present invention; Figure 2 It is the second structural schematic diagram of the automatic unloading and waste collection system of the automotive wire harness stamping connector provided by the implementation manner of the present invention; Figure 3 It is the third structural schematic diagram of the automatic unloading and waste collection system of the automotive wire harness stamping connector provided by the implementation manner of the present invention; Figure 4 is Figure 3 The partial enlarged view at A in

[0017] In the figure: 1. Stamping machine tool; 2. Negative pressure adsorption device; 3. Lower die base; 4. Blanking layer; 5. Upper cavity layer; 6. Lower cavity layer; 7. Micro holes; 8. Partition board; 9. Three-way air valve; 10. Robot arm; 11. Main adsorption pipeline; 12. Venturi pipeline; 13. Adsorption module; 14. Centrifugal fan; 15. First flowmeter; 16. Second flowmeter; 17. Encoder; 18. Micro switch; 19. Annular air collecting groove; 20. Connecting hole; 21. Flow guiding inclined plane; 22. Back blowing interface; 23. Carrier; 24. Workbench; 25. Guard plate; 26. Aggregate table. Specific embodiments

[0018] The following will clearly and completely describe the above and other embodiments and advantages of the present invention with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of them.

[0019] In one embodiment, as Figures 1 to 4 shown.

[0020] The automatic unloading and waste collection system for automotive wire harness stamping connectors provided in this embodiment is arranged between the stamping machine tool 1 and the negative pressure adsorption device 2. It includes a layered lower die base 3, and the lower die base 3 includes a blanking layer 4, an upper cavity layer 5, and a lower cavity layer 6 arranged in sequence from top to bottom. The blanking layer 4 is provided with arrayed micro holes 7. The micro holes 7 in the central area communicate with the upper cavity layer 5, and the micro holes 7 in the peripheral area communicate with the lower cavity layer 6. A partition board 8 is provided between the upper cavity layer 5 and the lower cavity layer 6. One side of the lower die base 3 is provided with a three-way air valve 9 that respectively connects the upper cavity layer 5 and the lower cavity layer 6, and the three-way air valve 9 is also connected to the air source; it also includes a robot arm 10, a main adsorption pipeline 11, and a Venturi pipeline 12. An adsorption module 13 that cooperates with the central area of the blanking layer 4 is provided on the robot arm 10. The main adsorption pipeline 11 is located at the bottom of the lower cavity layer 6 and is connected to the lower cavity layer 6. The inlet and throat of the Venturi pipeline 12 are respectively connected to the main adsorption pipeline 11 and the centrifugal fan 14 of the negative pressure adsorption device 2. The inlet and throat of the Venturi pipeline 12 are respectively provided with a first flowmeter 15 and a second flowmeter 16; it also includes an encoder 17. The encoder 17 is arranged at the end of the main shaft of the stamping machine tool 1 to detect the rotation angle and real-time stamping frequency of the main shaft. The robot arm 10, the centrifugal fan 14, and the three-way air valve 9 respectively act within the timing stages set according to the encoder 17. The target speed of the centrifugal fan 14 follows the real-time stamping frequency detected by the encoder 17, and the speed compensation of the centrifugal fan 14 is generated according to the pressure difference signal detected by the first flowmeter 15 and the second flowmeter 16.

[0021] In this embodiment, for the automatic unloading and waste collection system of the automotive wire harness stamping connector, to solve the problem of asynchrony in the operating rhythms of the servo robotic arm and the waste collection system, and to shorten the cycle of the robotic arm unloading and the waste collection system collecting waste, the traditional integral lower die base 3 is changed to a three-layer composite structure, including a blanking layer 4, an upper cavity layer 5, and a lower cavity layer 6. Among them, the blanking layer 4 is the working layer, and there is a separator plate 8 separating the upper cavity layer 5 and the lower cavity layer 6. It should be noted that the stamping workpiece is placed in the central area of the blanking layer 4, and waste is generated in the peripheral area of the blanking layer 4.

[0022] Sequentially according to the time sequence stages are the stamping stage, the unloading stage, the waste collection stage, and the transmission stage. In the stamping stage, the upper die descends for stamping and then ascends after completion. In this stage, the upper cavity layer 5 is connected to the air source and is in a negative pressure state to provide auxiliary fixation for the workpiece. In the unloading stage, when the upper die ascends to a position close to the highest position, that is, when the encoder 17 measures 120°, the robotic arm 10 quickly positions directly above the lower die base 3 and adsorbs the workpiece upward through the suction of the adsorption module 13. At this time, the centrifugal fan 14 maintains low-speed operation. In the waste collection stage, that is, the stage when the encoder 17 measures greater than 120°, the robotic arm 10 moves out of the die area and then places the workpiece on the aggregate table 26. In this stage, the three-way valve 9 operates to cut off the connection between the upper cavity layer 5 and the air source and instead connect the lower cavity layer 6 to the air source. In this stage, the lower cavity layer 6 is in a negative pressure state, and the waste enters the lower cavity layer 6 through the micropores 7. At the same time, the centrifugal fan 14 speeds up to the target speed, and the strong suction generated by the centrifugal fan 14 causes the waste to enter the main adsorption pipeline 11 from the lower cavity layer 6. The specific value of the target speed is calculated based on the real-time stamping frequency measured by the encoder 17, enabling the centrifugal fan 14 to perform frequency tracking and form a closed-loop control. At the same time, the actual flow rate is also calculated by measuring the pressure difference between the inlet and the throat of the Venturi pipeline 12 through the first flowmeter 15 and the second flowmeter 16, and then the rotational speed compensation of the centrifugal fan 14 is given according to the comparison relationship between the actual flow rate value and the theoretical value, forming another closed-loop control. In the transmission stage, that is, the stage before the encoder 17 measures 360°, the waste passes through the main adsorption pipeline 11, the Venturi pipeline 12, the centrifugal fan 14, and reaches the vibrating screen.

[0023] The above-mentioned respective timing stages are set according to the rotation angle detected by the encoder 17. The robotic arm 10, the centrifugal fan 14, and the three-way air valve 9 operate within the timing stages set according to the encoder 17, specifically operating according to the rotation angle value detected by the encoder 17. Among them, due to the time-delay effect of the air circuit, that is, the response of the air flow has an inherent delay due to factors such as the compressibility of the gas and the pipeline transmission time, which is essentially different from rigid mechanical motion. Relying solely on the frequency tracking of the encoder 17 will generate a phase accumulation error. Therefore, it is necessary to set the Venturi pipe 12, the first flowmeter 15, and the second flowmeter 16 to give speed compensation, so as to overcome the aforementioned problem of asynchronous operation beats. The reason for setting the Venturi pipe 12 is that the contraction and expansion structure of the Venturi pipe 12 increases the air flow velocity and amplifies the pressure difference, enabling more accurate calculation and giving of the speed compensation for the centrifugal fan 14.

[0024] Thus, the automatic unloading and waste collection system for the automotive wire harness stamping connector forms an overall solution with a dual closed-loop control architecture, solves the problem of asynchronous beats, and thus creates space for further shortening the processing cycle.

[0025] In one embodiment, as Figure 4 shown.

[0026] In the automatic unloading and waste collection system for the automotive wire harness stamping connector provided in this embodiment, a microswitch 18 is embedded in the blanking layer 4, and the microswitch 18 is triggered when the upper die contacts the lower die base 3.

[0027] In this embodiment, the set microswitch 18 and the encoder 17 form a redundant signal source, and the stamping node can still be accurately judged when the spindle angle sensor fails. The mechanical contact characteristic of the microswitch 18 can filter out false signals caused by electromagnetic interference and improve the reliability of the system. When the upper die descends and presses, the contacts of the microswitch 18 are pressed and closed, and the signal is input into the PLC, and logical operations are performed with the angle signal of the encoder 17. Only when the two are synchronized, the unloading process is started to avoid action misalignment caused by the failure of a single signal source.

[0028] In one embodiment, as Figure 4 shown.

[0029] In the automatic unloading and waste collection system for the automotive wire harness stamping connector provided in this embodiment, an annular air collecting groove 19 is opened at the bottom periphery of the lower cavity layer 6, and the lower cavity layer 6 is also provided with four connecting holes 20 connecting the annular air collecting groove 19 and the main adsorption pipeline 11.

[0030] In this embodiment, the provided annular air collecting groove 19 achieves uniform air collection. The annular structure improves the uniformity of the waste adsorption force field distribution, avoiding edge accumulation caused by traditional single-point adsorption. The four-hole symmetric layout disperses the air flow impact force, reducing the risk of stress concentration at the pipe interface. During operation, after the waste enters the lower cavity layer 6, it slides along the diversion inclined plane 21 towards the air collecting groove, and then the air flow velocity is reduced through the connecting holes 20 with four-way diversion, thereby reducing the impact wear of large particle waste on the pipeline.

[0031] In one embodiment, as Figure 4 shown.

[0032] For the automatic unloading and waste collection system of the automotive wire harness stamping connector provided in this embodiment, the cavity wall of the lower cavity layer 6 is provided with a diversion inclined plane 21, and the diversion inclined plane 21 is inclined downward and faces the annular air collecting groove 19.

[0033] In this embodiment, the provided diversion inclined plane 21 converts the vertically falling waste into tangential movement, reducing the particle rebound caused by air flow disturbance.

[0034] In one embodiment, as Figure 4 shown.

[0035] For the automatic unloading and waste collection system of the automotive wire harness stamping connector provided in this embodiment, the micropores 7 are conical holes, and the inlet diameter of the micropores 7 is 1.5 times the outlet diameter of the micropores 7. An anti-blowing interface 22 is provided on one side of the lower cavity layer 6.

[0036] In this embodiment, the provided conical holes enhance the waste carrying capacity and reduce the material jamming release force. When the waste gets stuck in the holes, the subsequent waste forms a piston effect under the push of the accelerating air flow, which can push out the jammed objects. The function of setting the anti-blowing interface 22 is to prevent blockage. When it is detected that the flow value continuously drops below the threshold, the solenoid valve is triggered through the PLC to generate a high-pressure air flow pulse to form a pneumatic hammer effect to shake off the blockage.

[0037] In one embodiment, the centrifugal fan 14 is a permanent magnet synchronous motor direct drive centrifugal fan 14.

[0038] In this embodiment, the permanent magnet synchronous motor direct drive centrifugal fan 14 has the advantage of short speed regulation response time.

[0039] In one embodiment, as Figure 3 shown.

[0040] The automatic unloading and waste collection system for the stamping connector of the automotive wiring harness provided by this embodiment further includes a carrier 23. The carrier 23 includes a workbench 24 and a guard plate 25 arranged around the workbench 24. The Venturi pipe 12 and the centrifugal fan 14 are located within the area enclosed by the guard plate 25. The lower die base 3 is fixed to the workbench 24. A material collecting table 26 is provided on one side of the carrier 23. The robotic arm 10 is a six-axis robotic arm 10.

[0041] In this embodiment, the sound insulation can be enhanced by setting the guard plate 25, and the splashing particles can be blocked. Setting the six-axis robotic arm 10 can flexibly adjust the trajectory among complex die structures and avoid the protruding features. Moreover, the flipping function of the wrist makes the suction cup always perpendicular to the surface of the workpiece, improving the adsorption stability.

[0042] The specific embodiments described above further elaborate on the invention purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. In particular, it is pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The automatic unloading and waste collection system for automobile wiring harness stamping parts is installed between the stamping machine and the negative pressure adsorption device, and is characterized by: It comprises a layered lower die base, which comprises a punching layer, an upper cavity layer, and a lower cavity layer arranged in sequence from top to bottom, the punching layer is provided with array-type micropores, the micropores in the central area are connected to the upper cavity layer, the micropores in the peripheral area are connected to the lower cavity layer, an isolation plate is provided between the upper cavity layer and the lower cavity layer, and a three-way air valve is provided on one side of the lower die base to connect the upper cavity layer and the lower cavity layer respectively, and the three-way air valve is also connected to an air source; It also includes a mechanical arm, a main adsorption pipeline, and a venturi pipeline, wherein the mechanical arm is provided with an adsorption module for the central area of ​​the blanking layer, the main adsorption pipeline is located at the bottom of the lower cavity layer and connected to the lower cavity layer, the inlet and throat of the venturi pipeline are respectively connected to the main adsorption pipeline and the centrifugal fan of the negative pressure adsorption device, and the inlet and throat of the venturi pipeline are respectively provided with a first flow meter and a second flow meter; It also includes an encoder, which is arranged at the spindle end of the stamping machine to detect the rotation angle of the spindle and the real-time stamping frequency. The robot arm, the centrifugal fan, and the three-way air valve respectively operate in the timing stages set according to the encoder. The target speed of the centrifugal fan follows the real-time stamping frequency detected by the encoder, and the speed compensation of the centrifugal fan is generated according to the pressure difference signal detected by the first flowmeter and the second flowmeter.

2. The automatic unloading and waste collection system for automobile wiring harness stamping connectors according to claim 1 is characterized in that: A micro switch is embedded in the punching layer, and the micro switch is triggered when the upper die contacts the lower die seat.

3. The automatic unloading and waste collection system for automobile wiring harness stamping connectors according to claim 1 is characterized in that: An annular gas collecting groove is provided on the periphery of the bottom of the lower cavity layer, and the lower cavity layer is also provided with four connecting holes connecting the annular gas collecting groove and the main adsorption pipeline.

4. The automatic unloading and waste collection system for automobile wiring harness stamping connectors according to claim 3 is characterized in that: The cavity wall of the lower cavity layer is provided with a flow guiding slope, and the flow guiding slope is inclined downward and faces the annular gas collecting groove.

5. The automatic unloading and waste collection system for automobile wiring harness stamping connectors according to claim 1, characterized in that: The micropore is a tapered hole, and the inlet diameter of the micropore is 1.5 times the outlet diameter of the micropore.

6. The automatic unloading and waste collection system for automobile wiring harness stamping connectors according to claim 5, characterized in that: A backflush interface is provided on one side of the lower cavity layer.

7. The automatic unloading and waste collection system for automobile wiring harness stamping connectors according to claim 1, characterized in that: The centrifugal fan is a permanent magnet synchronous motor direct-driven centrifugal fan.

8. The automatic unloading and waste collection system for automobile wiring harness stamping connectors according to claim 1, characterized in that: It also includes a carrier, which includes a workbench and a guard plate arranged around the workbench, the Venturi pipe and the centrifugal fan are located in the area surrounded by the guard plate, and the lower mold base is fixed on the workbench.

9. The automatic unloading and waste collection system for automobile wiring harness stamping connectors according to claim 8, characterized in that: A material collecting platform is provided on one side of the carrier.

10. The automatic unloading and waste collection system for automobile wiring harness stamping connectors according to claim 1, characterized in that: The robotic arm is a six-axis robotic arm.

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