Automatic unloading and waste collection system for automotive wiring harness stamping parts

Abstract

The present invention provides an automatic unloading and waste collection system for automobile wiring harness stamping connectors, which is arranged between a stamping machine and a negative pressure adsorption device, and includes a layered lower die base, the lower die base including 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 are connected to the upper cavity layer, and the micropores in the peripheral area are connected to the lower cavity layer, and an isolation is provided between the upper cavity layer and the lower cavity layer. A three-way air valve is provided on one side of the lower die base, and the three-way air valve is also connected to an air source; the system also includes a robotic arm, a main adsorption pipe, and a Venturi pipe, the robotic arm is provided with an adsorption module for the central area of ​​the blanking layer, the main adsorption pipe 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 pipe are respectively connected to the main adsorption pipe and the centrifugal fan of the negative pressure adsorption device, the inlet and throat of the Venturi pipe are respectively provided with a first flowmeter and a second flowmeter; the system also includes an encoder.

Description

Technical Field

[0001] The invention relates to the technical field of processing stamped metal parts, in particular to an automatic unloading and waste collection system for automobile wiring harness stamped connectors. Background Art

[0002] The automatic unloading and waste collection system for automotive wire harness stamping connectors is a post-production processing system for automotive wire harness stamping. It involves unloading qualified parts and collecting waste. An automotive wire harness stamping production line typically consists of a stamping machine, a discharge device, a waste collection system, a conveyor system, and a control system. The stamping machine is equipped with a precision die set for producing stamped connectors. The discharge device is equipped with a pneumatic suction cup assembly and a servo robotic arm, which drives the pneumatic suction cup assembly to grasp qualified parts. The waste collection system includes a negative pressure suction device, a vibrating screen, and a temporary waste storage bin. The negative pressure suction device is located below the precision die set and, when activated, collects stamping waste. The vibrating screen and negative pressure suction device are connected by a sealed pipeline. After the negative pressure suction device initially collects the waste, it is mechanically conveyed vertically or horizontally downward to the inlet of the vibrating screen, forming a continuous waste flow of stamping, suction, screening, and temporary storage.

[0003] However, the servo robot arm of the unloading device and the waste collection system operate asynchronously. For example, after the robot arm completes unloading, the waste collection system will start up late, causing the stamping machine to stop briefly and wait, resulting in wasted cycle time. Summary of the Invention

[0004] The present invention aims to solve the above technical problem and provides an automatic unloading and waste collection system for automobile wiring harness stamping connectors.

[0005] The technical solution of the present invention is that the automatic unloading and waste collection system of automobile wiring harness stamping connectors is arranged between the stamping machine tool and the negative pressure adsorption device, including 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 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, one side of the lower die base is provided with a three-way air valve respectively connected to the upper cavity layer and the lower cavity layer, the three-way air valve is also connected to the air source; it also includes a robotic arm, a main adsorption pipe, and a Venturi pipe, and the robotic arm is provided with an adsorption die in the central area of ​​the blanking layer block, the main adsorption pipe 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 pipe are respectively connected to the main adsorption pipe and the centrifugal fan of the negative pressure adsorption device, and the inlet and throat of the venturi pipe are respectively provided with a first flow meter and a second flow meter; it also includes an encoder, the encoder is provided at the spindle end of the stamping machine to detect the rotation angle of the spindle and the real-time stamping frequency, the robotic arm, the centrifugal fan, and the three-way air valve respectively operate 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 embodiment, 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 embodiment, 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 pipe.

[0008] As an embodiment, the cavity wall of the lower cavity layer is provided with a guide slope, and the guide slope is inclined downward and faces the annular gas collecting groove.

[0009] As an embodiment, the micropore is a tapered hole, and the inlet diameter of the micropore is 1.5 times the outlet diameter of the micropore.

[0010] As an embodiment, a backflush interface is opened on one side of the lower cavity layer.

[0011] As an embodiment, the centrifugal fan is a permanent magnet synchronous motor direct-driven centrifugal fan.

[0012] As an embodiment, it further 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.

[0013] As an embodiment, a material collection platform is provided on one side of the carrier.

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

[0015] Compared to the prior art, the present invention offers the following advantages: the automatic unloading and waste collection system for automotive wiring harness stamping connectors replaces the traditional monolithic lower die base with a three-layer composite structure, comprising a blanking layer, an upper cavity layer, and a lower cavity layer. The sequential stages are: stamping, unloading, waste collection, and transfer. During the stamping stage, the upper die descends to perform the stamping operation and then rises back up. During this stage, the upper cavity layer is connected to the air source and is under negative pressure, providing auxiliary support for the workpiece. During the unloading stage, the upper die returns to a near-maximum position, and the robotic arm quickly positions itself directly above the lower die base. The suction of the suction module pulls the workpiece upward, while the centrifugal fan maintains low speed operation. During the waste collection stage, the robotic arm moves out of the die area and places the workpiece on a collection table. During this stage, the three-way air valve operates, disconnecting the upper cavity layer from the air source and connecting the lower cavity layer to it. During this stage, the lower cavity layer is under negative pressure, allowing waste to enter the lower cavity layer through the micropores. At the same time, the centrifugal fan speed is increased to the target speed, generating a strong suction force that forces the waste from the lower chamber layer into the main adsorption duct. 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 track the frequency, forming a closed-loop control. The first and second flowmeters also measure the pressure difference between the inlet and throat of the Venturi duct to calculate the actual flow rate. Then, based on the comparison between the actual flow rate and the theoretical value, the centrifugal fan speed compensation is applied, forming another closed-loop control. During the transport phase, the waste passes through the main adsorption duct, the Venturi duct, the centrifugal fan, and finally the vibrating screening machine. Therefore, this automatic unloading and waste collection system for automotive wiring harness stamping parts forms a comprehensive solution with a dual closed-loop control architecture, solving the problem of asynchronous beats and creating space for further shortening the processing cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A first structural schematic diagram of an automatic unloading and waste collection system for automobile wiring harness stamping connectors provided in an embodiment of the present invention;

[0017] Figure 2 A second structural schematic diagram of the automatic unloading and waste collection system for automobile wiring harness stamping connectors provided in an embodiment of the present invention;

[0018] Figure 3 A third structural schematic diagram of the automatic unloading and waste collection system for automobile wiring harness stamping connectors provided by an embodiment of the present invention;

[0019] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0020] In the figure: 1. Stamping machine; 2. Negative pressure adsorption device; 3. Lower die base; 4. Blanking layer; 5. Upper cavity layer; 6. Lower cavity layer; 7. Micropores; 8. Isolation plate; 9. Three-way air valve; 10. Robotic arm; 11. Main adsorption pipe; 12. Venturi pipe; 13. Adsorption module; 14. Centrifugal fan; 15. First flow meter; 16. Second flow meter; 17. Encoder; 18. Micro switch; 19. Annular air collecting groove; 20. Connecting hole; 21. Guide slope; 22. Backflush interface; 23. Carrier; 24. Workbench; 25. Guard plate; 26. Aggregate table. DETAILED DESCRIPTION

[0021] The above and other embodiments and advantages of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments.

[0022] In one embodiment, Figures 1 to 4 shown.

[0023] The automatic unloading and waste collection system of automobile wiring harness stamping connectors provided in this embodiment is arranged between a stamping machine 1 and a negative pressure adsorption device 2, which 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 an array of micropores 7, the micropores 7 in the central area are connected to the upper cavity layer 5, and the micropores 7 in the peripheral area are connected to the lower cavity layer 6, and an isolation plate 8 is provided between the upper cavity layer 5 and the lower cavity layer 6. A three-way air valve 9 is provided on one side of the lower die base 3, which is respectively connected to 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 robotic arm 10, a main adsorption pipe 11, and a Venturi pipe 12. The robotic arm 10 is provided with an adsorption module 13 in the central area of ​​the blanking layer 4, and the main adsorption pipe 11 is provided. The auxiliary pipe 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 pipe 12 are respectively connected to the main adsorption pipe 11 and the centrifugal fan 14 of the negative pressure adsorption device 2. The inlet and throat of the venturi pipe 12 are respectively provided with a first flow meter 15 and a second flow meter 16; it also includes an encoder 17, which is provided at the spindle end of the stamping machine 1 to detect the rotation angle of the spindle and the real-time stamping frequency. The robotic arm 10, the centrifugal fan 14, and the three-way valve 9 respectively operate 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 flow meter 15 and the second flow meter 16.

[0024] In this embodiment, the automatic unloading and waste collection system of the automotive wiring harness stamping connector is designed to solve the asynchronous operation problem of the servo robot arm and the waste collection system, thereby shortening the cycle of the robot 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 the upper cavity layer 5 and the lower cavity layer 6 are separated by an isolation plate 8. It should be noted that the stamping workpiece is placed in the central area of ​​the blanking layer 4, and the waste is generated in the peripheral area of ​​the blanking layer 4.

[0025] The order of the stages in chronological order is the stamping stage, the unloading stage, the waste collection stage, and the transmission stage. In the stamping stage, the upper die moves downward to perform stamping and then rises back after completion. At this stage, the upper cavity layer 5 is connected to the air source and is in a negative pressure state, providing auxiliary fixation for the workpiece. In the unloading stage, the upper die rises to a position close to the highest position, that is, when the encoder 17 measures 120°, the robot arm 10 quickly positions itself directly above the lower die base 3, and uses the suction force of the adsorption module 13 to adsorb the workpiece upward. At this time, the centrifugal fan 14 maintains low-speed operation. In the waste collection stage, that is, when the encoder 17 measures an angle greater than 120°, the robot arm 10 moves out of the mold area and then places the workpiece on the collection table 26. At this stage, the three-way air valve 9 is actuated to cut off the upper cavity layer 5 from the air source and connect the lower cavity layer 6 to the air source. At this stage, the lower cavity layer 6 is in a negative pressure state, and waste enters the lower cavity layer 6 through the micropores 7. At the same time, the centrifugal fan 14 is accelerated to the target speed, and the centrifugal fan 14 generates a strong suction force to cause the waste to enter the main adsorption pipe 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, so that the centrifugal fan 14 can perform frequency tracking, forming a closed-loop control. At the same time, the pressure difference between the inlet and throat of the Venturi pipe 12 is measured by the first flowmeter 15 and the second flowmeter 16 to calculate the actual flow rate, and then the speed compensation of the centrifugal fan 14 is given based on the comparison relationship between the actual flow value and the theoretical value, forming another closed-loop control. In the transmission stage, that is, the stage before 360° measured by the encoder 17, the waste passes through the main adsorption pipe 11, the Venturi pipe 12, the centrifugal fan 14, and finally to the vibrating screening machine.

[0026] Each of the above-mentioned timing stages is 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 respectively operate within the timing stages set according to the encoder 17, specifically according to the rotation angle value detected by the encoder 17. Among them, due to the time lag effect of the gas path, that is, the response of the airflow 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 produce phase accumulation errors. Therefore, it is necessary to set a venturi pipe 12, a first flow meter 15, and a second flow meter 16 to provide speed compensation, thereby overcoming the aforementioned operating rhythm asynchrony problem. The reason for setting the venturi pipe 12 is that the contraction and expansion structure of the venturi pipe 12 increases the airflow velocity, amplifies the pressure difference, and more accurately calculates and provides the speed compensation of the centrifugal fan 14.

[0027] It can be seen that the automatic unloading and waste collection system of the automotive wiring harness stamping connectors has formed an overall solution with a dual closed-loop control architecture, which solves the problem of asynchronous beat and creates space for further shortening the processing cycle.

[0028] In one embodiment, Figure 4 shown.

[0029] The automatic unloading and waste collection system for automobile wiring harness stamping connectors provided in this embodiment has a micro switch 18 embedded in the blanking layer 4 , which is triggered when the upper die contacts the lower die base 3 .

[0030] In this embodiment, the microswitch 18 and encoder 17 form a redundant signal source, which can still accurately determine the stamping node when the spindle angle sensor fails. The mechanical contact characteristics of the microswitch 18 can filter out false signals caused by electromagnetic interference, improving system reliability. When the upper mold is pressed downward, the contacts of the microswitch 18 are pressed and closed, and the signal is input to the PLC, where it performs a logical operation with the angle signal of the encoder 17. The unloading process is only started when the two are synchronized, avoiding the misalignment of the action caused by the failure of a single signal source.

[0031] In one embodiment, Figure 4 shown.

[0032] The automatic unloading and waste collection system for automobile wiring harness stamping connectors provided in this embodiment has an annular air collecting groove 19 on the bottom periphery of the lower cavity layer 6, and the lower cavity layer 6 also has four connecting holes 20 connecting the annular air collecting groove 19 and the main adsorption pipe 11.

[0033] In this embodiment, the annular gas collecting groove 19 is provided to achieve uniform gas 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 symmetrical layout disperses the impact force of the airflow and reduces the risk of stress concentration at the pipeline interface. During operation, after the waste enters the lower cavity layer 6, it slides along the guide slope 21 to the gas collecting groove, and then the airflow velocity is reduced through the four-way diversion connection hole 20, thereby reducing the impact wear of large particles of waste on the pipeline.

[0034] In one embodiment, Figure 4 shown.

[0035] The automatic unloading and waste collection system for automobile wiring harness stamping connectors provided in this embodiment has a cavity wall of the lower cavity layer 6 provided with a guide slope 21 , which is inclined downward and faces the annular gas collecting groove 19 .

[0036] In this embodiment, the guide slope 21 is provided to convert the vertically falling waste into tangential motion, thereby reducing the rebound of particles caused by air flow disturbance.

[0037] In one embodiment, Figure 4 shown.

[0038] The automatic unloading and waste collection system for automobile wiring harness stamping connectors provided in this embodiment has a micro-hole 7 that is a tapered hole, and the inlet diameter of the micro-hole 7 is 1.5 times the outlet diameter of the micro-hole 7. A backflush port 22 is provided on one side of the lower cavity layer 6.

[0039] In this embodiment, the tapered hole enhances waste carrying capacity and reduces the force required to remove stuck material. When waste material becomes stuck in the hole, the accelerating airflow pushes subsequent waste material into a piston effect, pushing the stuck object out. The backflush port 22 prevents blockage. When the flow rate is detected to be persistently below a threshold, the PLC triggers a solenoid valve, generating a high-pressure airflow pulse that creates a pneumatic hammer effect to dislodge the obstruction.

[0040] In one embodiment, the centrifugal fan 14 is a permanent magnet synchronous motor direct-driven centrifugal fan 14 .

[0041] In this embodiment, the permanent magnet synchronous motor directly drives the centrifugal fan 14, which has the advantage of a short speed regulation response time.

[0042] In one embodiment, Figure 3 shown.

[0043] The automatic unloading and waste collection system for automotive wiring harness stamping parts provided in this embodiment also includes a carrier 23, which includes a workbench 24 and a protective plate 25 disposed around the workbench 24. The Venturi duct 12 and centrifugal fan 14 are located within the area enclosed by the protective plate 25. The lower die base 3 is fixed to the workbench 24. A material collection platform 26 is provided on one side of the carrier 23. The robot arm 10 is a six-axis robot arm 10.

[0044] In this embodiment, the provision of a guard plate 25 enhances sound insulation and blocks flying particles. The six-axis robotic arm 10 allows for flexible trajectory adjustment within complex mold structures, avoiding raised features. Furthermore, the wrist's flip function ensures the suction cup remains perpendicular to the workpiece surface, enhancing suction stability.

[0045] The specific embodiments described above further illustrate the purpose of the present invention, technical solutions, and beneficial effects. It should be understood that the above description is merely a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. In particular, it should be noted that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection 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, which is characterized by: The invention comprises a layered lower die base, which 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 are connected to the upper cavity layer, and 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. A three-way air valve is provided on one side of the lower die base, which is respectively connected to the upper cavity layer and the lower cavity layer, and the three-way air valve is also connected to an air source. It also includes a robotic arm, a main adsorption pipe, and a venturi pipe. The robotic arm is provided with an adsorption module that matches the central area of ​​the punching layer. The main adsorption pipe is located at the bottom of the lower cavity layer and connected to the lower cavity layer. The inlet and throat of the venturi pipe are respectively connected to the main adsorption pipe and the centrifugal fan of the negative pressure adsorption device. The inlet and throat of the venturi pipe are respectively provided with a first flow meter and a second flow meter. It also includes an encoder, which is arranged at the end of the spindle of the stamping machine to detect the rotation angle of the spindle and the real-time stamping frequency. The robotic arm, centrifugal fan, and three-way air valve respectively operate 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 based on 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 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 pipe.

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, which 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. 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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