Heavy pressure slow release mechanism based on dynamic feedback and control method thereof

Abstract

The invention discloses a heavy pressure slow release mechanism based on dynamic feedback and a control method thereof, and belongs to the technical field of mechanical pressure control. The polyurethane buffer blocks are arranged at the tail ends of the upper die supporting columns to absorb impact energy in a pre-contact mode, and staged pressure slow release in the die assembly process is achieved in combination with a cooperative compression mechanism of the pressure guide columns and the springs. Furthermore, the pressure is fed back to the PLC in real time through the pressure sensor, and the air inlet pressure is dynamically adjusted, so that the pressure at the mold closing tail end is stably transited to a set value. According to the heavy pressure slow release mechanism based on dynamic feedback and the control method thereof, the problems of large noise and high cost of traditional air cylinder mold closing are solved, the mechanism is successfully applied to an automobile sunshade curtain detection tool, the mold closing noise is greatly reduced, and the synchronization precision is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical pressure control, and particularly relates to a heavy-duty pressure relief mechanism based on dynamic feedback and its control method. Background Art

[0002] The frame sunshade curtain system is widely used in the automotive manufacturing industry. Compared with the previous skylights, the frame sunshade curtain system is thinner and lighter, and the structure is simpler. However, at the same time, it brings problems such as easy deformation and difficulty in pressing tightly due to the softness of the frame. Based on the change of the mechanism strength, in the detection of lightweight components such as automotive skylight frames and sunshade curtain systems, stable clamping needs to be achieved through heavy-duty pressure tools to complete the shaping of the frame. Along with this, a contradiction emerges. If the mold closing speed of the heavy-duty pressure tool is too fast, impact noise will occur, and if it is too slow, the efficiency will be affected.

[0003] Currently, the existing heavy-duty pressure tools adopt a structure of cylinder mold closing. The upper and lower molds clamp the workpiece. However, there are high requirements for the pressure, speed, and synchronization of the cylinder. Especially the stable output of pressure will directly affect the impact degree of upper and lower mold closing. In the process, a pressure stabilizing valve or even an air storage tank needs to be added to ensure the stability of mold closing. At the same time, in order to avoid impact noise, the final mold closing speed also needs to be adjusted through a metering air valve, and monitoring and adjustment are carried out in the electrical program. And no matter how slow the mold closing speed is, there will still be a "clang clang" impact sound, which is very unfriendly to the detection personnel in the long-term quiet and enclosed space, and it will also affect the judgment of noise. At the same time, in order to control the speed of the upper and lower molds, the hardware investment and maintenance costs are increased invisibly. In subsequent maintenance and repair, after replacing the worn parts, all components need to be readjusted, which is time-consuming and laborious.

[0004] Therefore, there is an urgent need for a new technical solution in the existing technology to solve this problem. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a heavy-duty pressure relief mechanism based on dynamic feedback and its control method, which is used to solve the problems of excessive impact noise during mold closing of heavy-duty pressure tools in the existing technology and high later maintenance costs.

[0006] The technical solution adopted by the present invention is to provide a heavy-duty pressure relief mechanism based on dynamic feedback, including an upper mold and a lower mold. The upper mold moves vertically under the action of a cylinder to close the mold with the lower mold. A support column of the upper mold is fixedly connected to the bottom of the upper mold, and a support column of the lower mold is fixedly connected to the top of the lower mold. The support column of the upper mold and the support column of the lower mold are used to buffer the impact force generated during mold closing. The support column of the upper mold includes a buffer pre-contact module, a pressure transmission module, and a dynamic feedback system, which are used to adjust the pressure and speed of mold closing in real time.

[0007] The buffer pre-contact module is a buffer block provided at the end of the upper die support column. The buffer block is made of an elastic material and preferentially contacts the lower die support column to absorb the initial impact energy.

[0008] The pressure transmission module includes a pressure guide post, a pressure pad, and a spring. The buffer block is fixedly connected to the pressure guide post nested inside the support column body. During the downward pressing process, the buffer block can retract into the support column body. The pressure is transmitted to the pressure pad through the pressure guide post, and the pressure pad pushes the upper piston and further compresses the internal spring.

[0009] The dynamic feedback system includes a pressure sensor and a PLC controller. The pressure sensor is used to collect the pressure value of the spring in real time. The data collected by the pressure sensor is fed back to the PLC controller, and the PLC controller adjusts the intake pressure valve according to the feedback signal to make the pressure at the end of mold closing smoothly transition to the set value.

[0010] The connection method between the upper die and the upper die support column is screw connection.

[0011] The upper die support columns and the lower die support columns are evenly distributed on the upper die and the lower die.

[0012] The buffer block is made of polyurethane material, with an elastic modulus > 100 MPa and a thickness of 10 mm.

[0013] The stiffness coefficient of the spring is 7.8, and the pre-compression amount is 2 mm.

[0014] An independent pre-tightening adjustment module is provided between the pressure guide post and the pressure pad. The independent pre-tightening adjustment module independently adjusts the pre-tightening force of each upper die support column to ensure the synchronization error of each column.

[0015] Another technical solution adopted by the present invention is to provide a control method for a heavy-duty pressure relief mechanism based on dynamic feedback, including the following steps:

[0016] The first stage: The cylinder drives the upper die to press down, and the buffer block preferentially contacts the workpiece to absorb more than 70% of the impact kinetic energy;

[0017] The second stage: The pressure guide post retracts into the support column body, pushes the piston to compress the spring, and the pressure sensor feeds back the pressure value in real time;

[0018] The third stage: The PLC controller adjusts the intake pressure valve according to the feedback signal to make the pressure at the end of mold closing smoothly transition to the set value.

[0019] Through the above design scheme, the present invention can bring the following beneficial effects:

[0020] 1. By setting the buffer pre-contact module, the initial impact energy can be effectively absorbed;

[0021] 2. By setting up a cooperative mechanism of pressure guide posts and springs, the impact force generated during mold closing is alleviated, effectively reducing the impact noise.

[0022] 3. Through pressure feedback closed-loop control, the synchronization error of the mold closing pressure is reduced.

[0023] 4. The traditional pressure stabilizing valve and gas storage tank are cancelled, reducing the hardware cost, simplifying the equipment, improving the stability, and also lowering the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 FIG. is a schematic diagram of the overall structure of a heavy-duty pressure relief mechanism based on dynamic feedback and its control method according to the present invention;

[0025] Figure 2 FIG. is a schematic diagram of the structure of the upper mold support column of a heavy-duty pressure relief mechanism based on dynamic feedback and its control method according to the present invention;

[0026] Figure 3 FIG. is a dynamic feedback control logic block diagram of a heavy-duty pressure relief mechanism based on dynamic feedback and its control method according to the present invention.

[0027] In the figures, 1 - upper mold, 2 - upper mold support column, 3 - lower mold support column, 4 - buffer block, 5 - pressure guide post, 6 - pressure pad, 7 - spring, 8 - support column main body, 9 - piston, 10 - pressure sensor, 11 - intake pressure valve, 12 - independent pre-tightening adjustment module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further describes the present invention in conjunction with the accompanying drawings and specific embodiments:

[0029] As Figures 1 - 3As shown in the figure, a heavy-duty pressure relief mechanism based on dynamic feedback of the present invention includes an upper die 1 and a lower die (not shown in the figure). The upper die 1 moves vertically under the action of a cylinder to close the die with the lower die. A support column 2 of the upper die is fixedly connected to the bottom of the upper die 1, and a support column 3 of the lower die is fixedly connected to the top of the lower die. The support column 2 of the upper die and the support column 3 of the lower die are used to buffer the impact force generated during die closing. The support column 2 of the upper die includes a buffer pre-contact module, a pressure transmission module, a dynamic feedback system, and an independent pre-tightening adjustment module, which are used to adjust the pressure and speed of die closing in real time. The buffer pre-contact module is a buffer block 4 provided at the end of the support column 2 of the upper die. The buffer block 4 is made of an elastic material. The buffer block 4 preferentially contacts the support column of the lower die to absorb the initial impact energy. The pressure transmission module includes a pressure guide column 5, a pressure pad 6, and a spring 7. The buffer block 4 is fixedly connected to the pressure guide column 5 nested in the main body 8 of the support column. During the downward pressing process, the buffer block 4 can retract into the main body 8 of the support column. The pressure is transmitted to the pressure pad 6 through the pressure guide column 5. The pressure pad 6 pushes the piston 9 above and further compresses the spring 7 inside. The dynamic feedback system includes a pressure sensor 10 and a PLC controller. The pressure sensor 10 is used to collect the pressure value of the spring 7 in real time. The data collected by the pressure sensor 10 is fed back to the PLC controller. The PLC controller adjusts the intake pressure valve 11 according to the feedback signal to make the pressure at the end of die closing smoothly transition to the set value. Among them, the independent pre-tightening adjustment module 12 is provided between the pressure guide column 5 and the pressure pad 6 to separately adjust the pre-tightening pressure of each support column 2 of the upper die to ensure the pressure difference generated when all the support columns contact quickly at the same time, and it is also convenient for adjustment during future maintenance.

[0030] Preferably, the connection mode between the upper die 1 and the support column 2 of the upper die is screw connection.

[0031] Preferably, the support column 2 of the upper die and the support column 3 of the lower die are evenly distributed on the upper die 1 and the lower die.

[0032] Preferably, the buffer block 4 is made of polyurethane material, with an elastic modulus > 100 MPa and a thickness of 10 mm.

[0033] Preferably, the stiffness coefficient of the spring 7 is 7.8, and the pre-compression amount is 2 mm.

[0034] The working process of the control method of a heavy-duty pressure relief mechanism based on dynamic feedback of the present invention:

[0035] The first stage: The cylinder drives the upper die 1 to press down. The buffer block 4 preferentially contacts the workpiece and absorbs more than 70% of the impact kinetic energy.

[0036] The second stage: The pressure guide column 5 retracts into the main body 8 of the support column, pushes the piston 9 to compress the spring 7, and the pressure sensor 10 feeds back the pressure value in real time.

[0037] The third stage: The PLC controller adjusts the intake pressure valve 11 according to the feedback signal to make the closing end pressure smoothly transition to the set value.

[0038] Embodiment: Apply this mechanism to the sunshade assembly line of U12 model.

[0039] The specific parameters are as follows:

[0040] The hardness of the polyurethane buffer block is 70A - 100A, and the thickness is 10 mm;

[0041] The spring stiffness coefficient is 7.8, and the pre-compression amount is 2 mm;

[0042] The closing impact noise drops from >130 dB to <10 dB.

[0043] The PLC control system can, according to different product requirements, adjust relevant parameters in real time through system programming to ensure the assembly accuracy. The PLC control program is already very mature. Using the existing technology, the specific application of this technology in the operation of the tooling will not be elaborated in this invention.

[0044] The implementation mode of the present invention is not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A heavy-duty pressure relief mechanism based on dynamic feedback, characterized in that: It includes an upper die (1) and a lower die. The upper die (1) moves vertically under the action of a cylinder to close the die with the lower die. A support column (2) of the upper die is fixedly connected to the bottom of the upper die (1), and a support column (3) of the lower die is fixedly connected to the top of the lower die. The support column (2) of the upper die and the support column (3) of the lower die are used to buffer the impact force generated during die closing. The support column (2) of the upper die includes a buffer pre-contact module, a pressure transmission module, and a dynamic feedback system, which are used to adjust the pressure and speed of die closing in real time.

2. The heavy-duty pressure relief mechanism based on dynamic feedback according to claim 1, characterized in that: The buffer pre-contact module is a buffer block (4) provided at the end of the support column (2) of the upper die. The buffer block (4) is made of an elastic material. The buffer block (4) preferentially contacts the support column (3) of the lower die to absorb the initial impact energy.

3. A heavy-duty pressure relief mechanism based on dynamic feedback according to claim 2, characterized in that: The pressure transmission module includes a pressure guide post (5), a pressure pad (6), and a spring (7). The buffer block (4) is fixedly connected to the pressure guide post (5) nested in the main body (8) of the support column. During the downward pressing process, the buffer block (4) can retract into the main body (8) of the support column. The pressure is transmitted to the pressure pad (6) through the pressure guide post (5). The pressure pad (6) pushes the upper piston (9) and further compresses the internal spring (7).

4. A heavy-duty pressure relief mechanism based on dynamic feedback according to claim 3, characterized in that: The dynamic feedback system includes a pressure sensor (10) and a PLC controller. The pressure sensor (10) is used to collect the pressure value of the spring (7) in real time. The data collected by the pressure sensor (10) is fed back to the PLC controller. The PLC controller adjusts the intake pressure valve (11) according to the feedback signal to make the pressure at the end of die closing smoothly transition to the set value.

5. A heavy pressure relief mechanism based on dynamic feedback according to claim 1, characterized in that: The connection mode between the upper die (1) and the support column (2) of the upper die is screw connection.

6. A heavy-duty pressure relief mechanism based on dynamic feedback according to claim 1, characterized in that: The support column (2) of the upper die and the support column (3) of the lower die are evenly distributed on the upper die (1) and the lower die.

7. A heavy-duty pressure relief mechanism based on dynamic feedback according to claim 2, characterized in that: The buffer block (4) is made of polyurethane material, with an elastic modulus > 100 MPa and a thickness of 10 mm.

8. A heavy-duty pressure relief mechanism based on dynamic feedback according to claim 3, characterized in that: The stiffness coefficient of the spring (7) is 7.8, and the pre-compression amount is 2 mm.

9. The heavy-duty pressure relief mechanism based on dynamic feedback according to claim 3, characterized in that: An independent pre-tightening adjustment module (12) is provided between the pressure guide post (5) and the pressure pad (6). The independent pre-tightening adjustment module (12) independently adjusts the pre-tightening force of each support column (2) of the upper die to ensure the synchronous error of each column.

10. A control method for a heavy-duty pressure relief mechanism based on dynamic feedback, using the heavy-duty pressure relief mechanism based on dynamic feedback as described in any one of claims 1-9, characterized in that: It includes the following steps: The first stage: The cylinder drives the upper die (1) to press down. The buffer block (4) preferentially contacts the workpiece and absorbs more than 70% of the impact kinetic energy. The second stage: The pressure guide post (5) retracts into the main body (8) of the support column, pushes the piston (9) to compress the spring (7), and the pressure sensor (10) feeds back the pressure value in real time. The third stage: The PLC controller adjusts the intake pressure valve (11) according to the feedback signal to make the pressure at the end of die closing smoothly transition to the set value.

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