Self-adaptive blank pressing pneumatic control system

Abstract

The utility model discloses a self-adaptive pneumatic control system for blank pressing, which is characterized in that the pneumatic control system comprises an air source processor (1), and the outlet end of the air source processor (1) is respectively connected with a port 1 of a first pressure reducing valve (2), a port 1 of an electric proportional pressure valve (4) and a port 1 of a second pressure reducing valve (7) through a three-way valve; a second port of the first pressure reducing valve (2) is connected with a first port of the first single-electric-control two-position three-way valve (3), a second port of the first single-electric-control two-position three-way valve (3) is connected with an unlocking air port of the blank pressing air cylinder (10), and a second port of the electric proportional pressure valve (4) is connected with a first port of the second single-electric-control two-position three-way valve (5). A second port of the second single electric control two-position three-way valve (5) is connected with a first port of a first one-way throttling speed regulating valve (6), and a second port of the first one-way throttling speed regulating valve (6) is connected with an air port in the extending end of an edge pressing air cylinder (10).

Description

Technical Field

[0001] The utility model relates to a pneumatic control system, in particular to an adaptive blank holding pneumatic control system. Background Art

[0002] At present, various pneumatic control circuits are often used in the mechanical field. In the automotive industry, blank holding is a very common process requirement, so a variety of blank holding devices have emerged. The control feature of the commonly used devices in the industry is a semi-adaptive circuit. That is, several pressure settings are made for the device, and for workpieces of different shapes, through multiple tests, it is judged which pressure to use at which position. The common feature of this kind of device is that it requires a long debugging and testing process to determine the pressure value at a fixed position. The flexibility is very low, and a large amount of time and labor costs need to be invested.

[0003] Therefore, there is a need for a method or device that can solve the above problems now. Summary of the Invention

[0004] The utility model is proposed to solve the above-mentioned deficiencies of the prior art, and provides a blank holding pneumatic control system with a simple structure, ingenious design, reasonable layout, which can realize safety interlock and internal closed-loop control of the system, and has high self-adaptability at the same time.

[0005] The technical solution of the utility model is: an adaptive blank holding pneumatic control system, characterized in that: the pneumatic control system includes a pneumatic source treatment 1, the outlet end of the pneumatic source treatment 1 is connected to the port 1 of the first pressure reducing valve 2, the port 1 of the electro-pneumatic proportional pressure valve 4 and the port 1 of the second pressure reducing valve 7 through a three-way valve respectively,

[0006] The port 2 of the first pressure reducing valve 2 is connected to the port 1 of the first single electrically controlled two-way three-way valve 3, and the port 2 of the first single electrically controlled two-way three-way valve 3 is connected to the unlocking air port of the blank holding cylinder 10,

[0007] The port 2 of the electro-pneumatic proportional pressure valve 4 is connected to the port 1 of the second single electrically controlled two-way three-way valve 5, the port 2 of the second single electrically controlled two-way three-way valve 5 is connected to the port 1 of the first one-way throttle speed control valve 6, and the port 2 of the first one-way throttle speed control valve 6 is connected to the extending end air port of the blank holding cylinder 10,

[0008] The port 2 of the second pressure reducing valve 7 is connected to the port 1 of the third single electrically controlled two-way three-way valve 8, the port 2 of the third single electrically controlled two-way three-way valve 8 is connected to the port 1 of the second one-way throttle speed control valve 9, and the port 2 of the second one-way throttle speed control valve 9 is connected to the retracting end air port of the blank holding cylinder 10,

[0009] A pressure detection sensor 11 is arranged in the blank holding head of the blank holding cylinder 10.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] The adaptive blank-holding pneumatic control system with this structural form has a simple structure, ingenious design and reasonable layout. Aiming at the problems existing in the traditional blank-holding pneumatic control system during the working process, it designs a structure capable of real-time detecting pressure values. The blank-holder head feeds back the pressure values detected during the blank-holding operation to the control system (PLC). The control system compares it with the preset program and controls the electro-pneumatic proportional pressure valve in the air circuit according to the comparison result to adjust the pressure at the extending end of the blank-holding cylinder, so as to achieve the purpose of regulating the blank-holding force of the blank-holder head. In this way, targeted operations can be carried out for workpieces of different shapes and different blank-holding positions; it can achieve closed-loop control in the whole system and complete targeted and adaptive blank-holding operations without manual testing. And the manufacturing process of this control system is simple and the manufacturing cost is low. Therefore, it can be said that it has multiple advantages and is especially suitable for popularization and application in this field, and its market prospect is very broad. Description of the Drawings

[0012] Figure 1 It is the overall layout diagram of the embodiment of the utility model. Detailed Embodiment

[0013] The following will describe the detailed embodiment of the utility model in conjunction with the drawings. As Figure 1 shown: An adaptive blank-holding pneumatic control system, characterized in that: the pneumatic control system includes a pneumatic source treatment 1, and the outlet end of the pneumatic source treatment 1 is respectively connected to the port 1 of the first pressure reducing valve 2, the port 1 of the electro-pneumatic proportional pressure valve 4 and the port 1 of the second pressure reducing valve 7 through a three-way valve,

[0014] The port 2 of the first pressure reducing valve 2 is connected to the port 1 of the first single electrically controlled two-way three-way valve 3, and the port 2 of the first single electrically controlled two-way three-way valve 3 is connected to the unlocking air port of the blank-holding cylinder 10,

[0015] The port 2 of the electro-pneumatic proportional pressure valve 4 is connected to the port 1 of the second single electrically controlled two-way three-way valve 5, the port 2 of the second single electrically controlled two-way three-way valve 5 is connected to the port 1 of the first one-way throttle speed control valve 6, and the port 2 of the first one-way throttle speed control valve 6 is connected to the extending end air port of the blank-holding cylinder 10,

[0016] The port 2 of the second pressure reducing valve 7 is connected to the port 1 of the third single electrically controlled two-way three-way valve 8, the port 2 of the third single electrically controlled two-way three-way valve 8 is connected to the port 1 of the second one-way throttle speed control valve 9, and the port 2 of the second one-way throttle speed control valve 9 is connected to the retracting end air port of the blank-holding cylinder 10,

[0017] A pressure detection sensor 11 is arranged inside the blank-holder head of the blank-holding cylinder 10.

[0018] The working process of the adaptive blank-holding pneumatic control system according to the embodiment of the present utility model is as follows: First, the air source is turned on, and the air source treatment unit 1 starts to work.

[0019] At this time, port 1 of the first pressure reducing valve 2 is ventilated, port 2 is exhausted, and port 1 of the first single electrically controlled two-way three-way valve 3 is ventilated.

[0020] Port 2 of the electro-pneumatic proportional pressure valve 4 is ventilated. At this time, the blank-holding head of the blank-holding cylinder 10 does not contact the workpiece, and the pressure detection sensor 11 provided therein has no pressure feedback. Therefore, port 2 of the electro-pneumatic proportional pressure valve 4 outputs air pressure according to the initial pressure, and then port 1 of the second single electrically controlled two-way three-way valve 5 is ventilated.

[0021] Port 1 of the second pressure reducing valve 7 is ventilated, port 2 is exhausted, and then port 1 of the third single electrically controlled two-way three-way valve 8 is ventilated.

[0022] After the workpiece is placed in place, the detection switch detects that the workpiece has reached the position, and then sends a signal to the PLC. The PLC sends an unlocking signal to the first single electrically controlled two-way three-way valve 3 to control the first single electrically controlled two-way three-way valve 3 to change its direction. At this time, port 2 of the first single electrically controlled two-way three-way valve 3 is ventilated, and the unlocking air port of the blank-holding cylinder 10 is ventilated, so the blank-holding cylinder 10 is unlocked.

[0023] At the same time, the PLC also sends a signal to the second single electrically controlled two-way three-way valve 5 to control the second single electrically controlled two-way three-way valve 5 to make a reversing action. At this time, port 2 of the second single electrically controlled two-way three-way valve 5 is ventilated, and the extending end air port of the blank-holding cylinder 10 is ventilated, and the blank-holding cylinder 10 starts to make an extending action, driving its blank-holding head to make a blank-holding action.

[0024] After the blank-holding head contacts the workpiece, the pressure detection sensor 11 provided therein will receive a pressure feedback signal and transmit this signal to the PLC. The PLC compares and calculates this real-time pressure signal with the preset value stored in advance, and issues an instruction to the electro-pneumatic proportional pressure valve 4 according to the comparison result, and adjusts (increases or decreases) the air pressure to adjust the blank-holding force of the blank-holding head of the blank-holding cylinder 10, so as to ensure that the blank-holding operation of the blank-holding head meets the process requirements.

[0025] After the blank-holding operation is completed, the PLC sends a signal to the second single electrically controlled two-way three-way valve 5, and the second single electrically controlled two-way three-way valve 5 returns to its original position. At the same time, the PLC also sends a signal to the third single electrically controlled two-way three-way valve 8, and the third single electrically controlled two-way three-way valve 8 changes its direction, and its port 2 is ventilated. At this time, the retracting end air port of the blank-holding cylinder 10 is ventilated, and the blank-holding cylinder 10 starts to retract.

[0026] After the blank holding cylinder 10 retracts to its in-place position, the PLC stops the commutation signal of the first single-solenoid two-way three-way valve 3, and the first single-solenoid two-way three-way valve 3 returns to its original position. At this time, the blank holding cylinder 10 returns to the locked state again, and a working cycle ends.

Claims

1. An adaptive edge-holding pneumatic control system, characterized in that: The pneumatic control system comprises an air source processing (1), wherein the outlet end of the air source processing (1) is respectively connected to a port 1 of a first pressure reducing valve (2), a port 1 of an electric proportional pressure valve (4), and a port 1 of a second pressure reducing valve (7) through a three-way valve. Port 2 of the first pressure reducing valve (2) is connected to port 1 of the first single solenoid-controlled two-position three-way valve (3), and port 2 of the first single solenoid-controlled two-position three-way valve (3) is connected to the unlocking port of the edge pressing cylinder (10). Port 2 of the electrical proportional pressure valve (4) is connected to port 1 of the second single-electrically controlled two-position three-way valve (5), and port 2 of the second single-electrically controlled two-position three-way valve (5) is connected to port 1 of the first one-way throttling speed regulating valve (6), and port 2 of the first one-way throttling speed regulating valve (6) is connected to the extended end air port of the edge pressing cylinder (10). Port 2 of the second pressure reducing valve (7) is connected to port 1 of the third single-electrically controlled two-position three-way valve (8), and port 2 of the third single-electrically controlled two-position three-way valve (8) is connected to port 1 of the second one-way throttling speed regulating valve (9), while port 2 of the second one-way throttling speed regulating valve (9) is connected to the return end air port of the edge pressing cylinder (10). A pressure detection sensor (11) is provided in the edge pressing head of the edge pressing cylinder (10).

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