A dual-cylinder pneumatic solenoid valve linkage control system and method for a test tooling

Abstract

The present invention discloses a dual-cylinder pneumatic solenoid valve linkage control system for a test tooling, which includes a pneumatic solenoid valve dual-brake control module, a safety brake emergency stop control module, and an anti-mis-touch control module connected to each other. The dual-cylinder pneumatic solenoid valve linkage control system of the present invention can make the pressing force on the circuit board stable, replace the manual pressing of the test fixture, reduce manual operations, and set up a safety brake emergency stop control module and an anti-mis-touch control module to improve the test efficiency, safety and stability, and extend the service life of the circuit board. The dual-cylinder pneumatic solenoid valve linkage control method of the present invention can prevent the failure of the connectors of the test fixture of the board under test or the pulling of the board under test by using the sequence of the second cylinder and the first cylinder retracting successively, reduce the phenomenon of cylinder braking caused by manual mis-touch of the button, and provide an emergency stop deadlock function, ensuring the safety of workers during the production test process.

Description

Technical Field

[0001] The present invention relates to the field of automated machinery, and specifically refers to a dual-cylinder pneumatic solenoid valve linkage control system and method for a test fixture. Background Art

[0002] In existing traditional circuit board test fixtures, most still stay at the method of manually pressing the test fixture to ensure effective contact between the circuit board to be tested on the carrier board and the test pins. In the application scenarios of batch testing of circuit boards, this method is relatively backward. In the scenarios of testing circuit board connectors, especially for the ECU (Electronic Control Unit) circuit board of vehicle-mounted products, manual secondary operation of the connector pressing fixture is required, which consumes a lot of manpower and is inefficient under long-term operation.

[0003] Chinese Utility Model with publication number CN208224439U discloses a circuit board detection device. The key points of its technical solution are: including a base, a loading platform arranged on the base, a pressing plate arranged on the base directly above the loading platform, a mounting plate arranged on the base directly below the loading platform, a cylinder connected between the base and the mounting plate, and a plurality of main probes arranged on the mounting plate. The main probe includes a support frame connected to the mounting plate, a pressing block arranged at the upper end of the support frame, and a plurality of branch probes circumferentially arranged around the pressing block. The branch probes are electrically connected together. When the cylinder pushes the mounting plate to rise and the main probe contacts the circuit board, the pressing block can abut against the key of the circuit board, and the branch probes contact the circuits around the key. However, the detection accuracy of this circuit board detection device is low, and the pressing force is uneven. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a dual-cylinder pneumatic solenoid valve linkage control system and method for a test fixture with high detection accuracy and balanced pressing force.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A dual-cylinder pneumatic solenoid valve linkage control system for a test tooling, comprising a pneumatic solenoid valve dual-brake control module, a safety brake emergency stop control module, and an anti-misoperation control module connected to each other. The pneumatic solenoid valve dual-brake control module includes a module input end and a first signal flip control module connected to each other. The first signal flip control module is connected to a first buffer and a second inverter. The first buffer is connected to one input end of a two-input OR gate. The other input end of the two-input OR gate is sequentially connected to a first inverter and a first drive switch. The output end of the two-input OR gate is connected to a first solenoid valve driver, a delay drive module, a first solenoid valve, and a first cylinder connected to each other in sequence. The second inverter is connected to a tri-state gate. One end of the tri-state gate is connected to a second drive switch, and the other end of the tri-state gate is sequentially connected to a second solenoid valve driver, a second solenoid valve, and a second cylinder.

[0007] Further, the safety brake emergency stop control module includes an emergency stop switch module. The emergency stop switch module is respectively associated with a software interface, a hardware interface, a safety power supply, and a second signal flip control module. The second signal flip control module is connected to an exclusive-OR output controller and an output locking component.

[0008] Further, the anti-misoperation control module is provided with a two-input AND gate. The two-input AND gate is connected to a first start button and a second start button.

[0009] Further, the first cylinder is connected to a first switch, and the second cylinder is connected to a second switch. The first switch is a normally open switch, and the second switch is a normally closed switch.

[0010] Further, a third switch is provided in the software interface, a fourth switch is provided in the hardware interface, and a fifth switch is provided in the safety power supply. The third switch, the fourth switch, and the fifth switch are all normally closed switches.

[0011] Further, the dual-cylinder pneumatic solenoid valve linkage control system further includes a first start button, a second start button, and an indicator light group connected to each other. The indicator light group includes a test success indicator light and a test failure indicator light.

[0012] A dual-cylinder pneumatic solenoid valve linkage control method for a test tooling, comprising the following steps:

[0013] Step 1: Input a control pulse at the module input end, and the control pulse acts on the first signal flip control module;

[0014] Step 2: Define H to represent a high level and L to represent a low level. When the output of the first signal flip control module is H, start the solenoid valve linkage control. At this time, the first buffer is turned on, and the first solenoid valve driver is turned on through the two-input OR gate, thereby braking the first cylinder;

[0015] Step 3: The first cylinder is pressed down under the control of the first solenoid valve. When the first switch is closed, the second drive switch responds and outputs H. Since the input of the first inverter is H, the input L controls the output of the tri-state gate to be in a high-impedance state, and the second solenoid valve driver turns on the second solenoid valve and brakes the second cylinder.

[0016] Step 4: When the second cylinder is pressed down until the second switch is opened, the first drive switch responds and outputs L, and outputs H to the two-input OR gate through the first inverter. The two-input OR gate outputs H, and the first solenoid valve is in the starting state. At this time, both the first solenoid valve and the second solenoid valve are in the starting state.

[0017] Step 5: Control the second cylinder to retract first, and then control the first cylinder to retract.

[0018] Further, the retraction includes the following steps:

[0019] Step a: When the first signal flip control module receives a pulse signal, the output flips from H to L. The second drive switch outputs L to the second solenoid valve driver. At this time, the second solenoid valve is turned off, and the second cylinder contracts and retracts.

[0020] Step b: When the second cylinder retracts and returns to its original position, the second switch closes again. The first drive switch outputs H, and outputs L to the two-input OR gate through the first inverter. The two-input OR gate outputs L to control the first solenoid valve driver to turn off the first solenoid valve, and the delay drive module delays the turn-off of the first solenoid valve.

[0021] The present invention has the following advantages and beneficial effects compared with the prior art:

[0022] The double-cylinder pneumatic solenoid valve linkage control system of the present invention can make the pressing force on the circuit board stable, replace the manual pressing test fixture method, reduce manual operation, and set up a safety braking emergency stop control module and an anti-mis-touch control module, with high detection accuracy, improving the test efficiency, safety and stability, and prolonging the service life of the circuit board. The double-cylinder pneumatic solenoid valve linkage control method of the present invention can prevent the failure of the connectors of the test fixture of the to-be-tested board or the situation of pulling the to-be-tested board by using the sequence of the second cylinder and the first cylinder retracting successively, reduce the phenomenon of cylinder braking caused by manual mis-touching the button, and provide an emergency stop deadlock function, ensuring the safety of workers during the production test process. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of a double-cylinder pneumatic solenoid valve linkage control system;

[0024] Figure 2 It is a start control process diagram of a double-cylinder pneumatic solenoid valve linkage control system;

[0025] Figure 3It is the start state diagram of the double-cylinder pneumatic solenoid valve linkage control system;

[0026] Figure 4 It is the retraction control process diagram of the double-cylinder pneumatic solenoid valve linkage control system;

[0027] Figure 5 It is the safety brake emergency stop control module diagram;

[0028] Figure 6 It is the anti-misoperation control module diagram;

[0029] Figure 7 It is the schematic diagram of the button structure;

[0030] Figure 8 It is the step diagram of the double-cylinder pneumatic solenoid valve linkage control method. Specific embodiments

[0031] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] It should be noted that the terms "including", "comprising" and "having" and any variations thereof in the description and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices. In the terms in the claims, description and drawings of the present invention, relational terms such as "first" and "second" are only used to distinguish one entity / operation / object from another entity / operation / object, and do not necessarily require or imply any actual relationship or order between these entities / operations / objects.

[0034] Such as Figure 1 、 Figure 5 、 Figure 6As shown in the figure, a dual-cylinder pneumatic solenoid valve linkage control system for a test tooling includes a pneumatic solenoid valve dual-brake control module, a safety brake emergency stop control module, and an anti-misoperation control module that are connected to each other. The pneumatic solenoid valve dual-brake control module includes a module input terminal 1 and a first signal flip control module 2 that are connected to each other. The first signal flip control module 2 is connected to a first buffer 3 and a second inverter 17. The first buffer 3 is connected to one input terminal of a two-input OR gate 6. The other input terminal of the two-input OR gate 6 is sequentially connected to a first inverter 5 and a first drive switch 4. The output terminal of the two-input OR gate 6 is connected to a first solenoid valve driver 11, a delay drive module 7, a first solenoid valve 8, and a first cylinder 9 that are sequentially connected to each other. The second inverter 17 is connected to a tri-state gate 16. One end of the tri-state gate 16 is connected to a second drive switch 18. The other end of the tri-state gate 16 is sequentially connected to a second solenoid valve driver 12, a second solenoid valve 15, and a second cylinder 13.

[0035] The on-off states of both the first solenoid valve 8 and the second solenoid valve 15 are controlled by the control pulse from the module input terminal 1. The control pulse acts on the first signal flip control module 2. Every time a control pulse is input, the first signal flip control module 2 captures one rising edge. When the low level switches to the high level, the output signal flips once, from the high level to the low level, or from the low level to the high level, and is maintained until the next known pulse input before flipping again.

[0036] Such as Figure 5As shown in the figure, the safety braking emergency stop control module includes an emergency stop switch module 26. The emergency stop switch module 26 is respectively associated with a software interface 19, a hardware interface 28, a safety power supply 24, and a second signal inversion control module 21. The second signal inversion control module 21 is connected to an exclusive OR output controller 22 and an output locking component 211. A sixth switch 25 is provided in the emergency stop switch module 26. During the actual production test process, there may be abnormal power-on and burning due to defective boards under test, and manual operation errors may cause possible work-related injuries to workers when the cylinder brakes, as well as other production safety situations. Therefore, for the automated structural control components of the test fixture, such as cylinders, etc., relevant emergency safety protection mechanisms are required to prevent safety incidents from occurring or deteriorating. The safety power supply 24 mainly refers to the power supply equipment that may cause safety incidents or may further deteriorate the incidents due to the occurrence of safety incidents. The software interface 19 and the hardware interface 28 mainly provide input control paths for the upper computer or hardware (such as buttons). The basic condition for the two-way control output is that in a certain control cycle, there is and only one interface that outputs a control signal. That is, in the actual control process, software control or hardware control can be selected. When the emergency stop switch module 26 is manually braked, the software interface 19, the hardware interface 28, and the safety power supply 24 will be cut off simultaneously, and the output of the second signal inversion control module 21 will be locked in the output L state through the output locking component 211, that is, the cylinder braking state is closed. This ensures that all controllable components fail, thereby avoiding the occurrence and deterioration of some production safety incidents.

[0037] As Figure 6 shown in the figure, the anti-misoperation control module is provided with a two-input AND gate 31. The two-input AND gate 31 is connected to a first start key 29 and a second start key 30. The double-way button is used for anti-misoperation control through the AND logic input method, as follows Figure 6 shown in the figure, only when both the first start key 29 and the second start key 30 are pressed can the output control pulse be further triggered.

[0038] The first cylinder 9 is connected to a first switch 10, and the second cylinder 13 is connected to a second switch 14. The first switch 10 is a normally open switch, and the second switch 14 is a normally closed switch. A third switch 20 is provided in the software interface 19, a fourth switch 27 is provided in the hardware interface 28, a fifth switch 23 is provided in the safety power supply 24, and the third switch 20, the fourth switch 27, the fifth switch 23, and the sixth switch 25 are all normally closed switches.

[0039] As Figure 7As shown in the figure, the double-cylinder pneumatic solenoid valve linkage control system further includes a connected first start button 32, a second start button 35, and an indicator light group. The indicator light group includes a test success indicator light 33 and a test failure indicator light 34. In the actual production test environment, the control methods of the first start button 32 and the second start button 35 will not cause the braking of the automated structural components of the tooling even if a single button is accidentally touched due to human factors. Therefore, when designing the tooling, there are certain structural requirements for the placement positions of the first start button 32 and the second start button 35, that is, the placement positions of the first start button 32 and the second start button 35 on the tooling need to be as far away from each other as possible to minimize the risk of the two buttons being pressed simultaneously. The test tooling is accurate. If the test is successful, the test success indicator light 33 will light up; if the test fails, the test failure indicator light 34 will light up.

[0040] As Figure 8 shown, a double-cylinder pneumatic solenoid valve linkage control method for a test tooling includes the following steps:

[0041] Step 1: A control pulse is input at the module input terminal 1, and the control pulse acts on the first signal flip-flop control module 2;

[0042] Step 2: Define H as high level and L as low level. When the output of the first signal flip-flop control module 2 is H, the solenoid valve linkage control is started. At this time, the first buffer 3 is turned on, and the first solenoid valve driver 11 is turned on through the two-input OR gate 6, thereby braking the first cylinder 9;

[0043] Step 3: As Figure 2 described, when the first cylinder 9 is controlled by the first solenoid valve 8 to press down and the first switch 10 is closed, the second drive switch 18 responds and outputs H. The input of the first inverter 5 is H. Since the input of the second inverter 17 is H, the input L controls the output of the tri-state gate to be in a high-impedance state 16. At this time, the tri-state gate 16 is in a high-impedance state, which is equivalent to the output being disconnected from the outside. Therefore, the H signal output by the second drive switch 18 can control the second solenoid valve driver 12 to turn on the second solenoid valve 15 and brake the second cylinder 13;

[0044] Step 4: As Figure 3 shown, when the second cylinder 13 presses down until the second switch 14 is disconnected, the first drive switch 4 responds and outputs L, and outputs H to the two-input OR gate 6 through the first inverter 5. The two-input OR gate 6 outputs H, and the first solenoid valve 8 is in the starting state. At this time, both the first solenoid valve 8 and the second solenoid valve 15 are in the starting state;

[0045] Step 5: Control the second cylinder 13 to retract first, and then control the first cylinder 9 to retract.

[0046] The first switch 10 and the second drive switch 18 have a linkage control relationship, and the second switch 14 and the first drive switch 4 have a linkage control relationship.

[0047] As Figure 4 shown, the retraction includes the following steps:

[0048] Step a: When the first signal flip control module 2 receives a pulse signal once, the output flips from H to L. The output of the second inverter 17 is H to control the tri-state gate 16 to conduct. The tri-state gate 16 outputs L. The second drive switch 18 has a linear relationship with the output of the tri-state gate 16. The second drive switch 18 outputs L to the second solenoid valve driver 12. At this time, the second solenoid valve 15 is turned off, and the second cylinder 13 contracts and retracts.

[0049] Step b: When the second cylinder 13 retracts and returns to its original position, the second switch 14 closes again. The first drive switch 4 outputs H, and after passing through the first inverter 5, it outputs L to the two-input OR gate 6. The first signal flip control module 2 outputs L, and after passing through the first buffer 3, it outputs L to the two-input OR gate 6. Then the two-input OR gate 6 meets the condition of outputting L, controlling the first solenoid valve driver 11 to turn off the first solenoid valve 8, and the delay drive module 7 delays the turn-off of the first solenoid valve 8.

[0050] A delay drive module 7 is provided in the first solenoid valve 8, so the first solenoid valve 8 will be delayed in turning off. Therefore, when the second cylinder 13 contracts and retracts, the first solenoid valve 8 will not be immediately turned off to brake the contraction of the first cylinder 9. After the set delay time, the first cylinder 9 contracts and retracts to its original position, and the entire control process returns to the initial state.

[0051] Generally, the first cylinder 9 is used to press the test fixture of the plate to be tested, and the second cylinder 13 is used to press the connector fixture. Therefore, during the retraction process, the second cylinder 13 needs to retract and contract first. When the second cylinder 13 retracts and returns to its original position, the first cylinder 9 starts to retract and contract. This is to prevent the connector of the plate to be tested from not being completely pulled out when the second cylinder 13 retracts and contracts, and the first cylinder 9 retracts and contracts to release the pressure on the test fixture of the plate to be tested, resulting in the failure of pulling out the connector or the situation of pulling the plate to be tested. The specific cylinder braking structure and process are shown as follows Figure 4 shown.

[0052] The working principle of the present invention is as follows:

[0053] Through the linkage of a double-cylinder solenoid valve, the first cylinder 9 is used to press the test fixture of the plate to be tested, and the second cylinder 13 is used to press the connector fixture. The control pulse is applied to the first signal flip-flop control module 2. When the output of the first signal flip-flop control module 2 is H, the solenoid valve linkage control is started, the first buffer 3 is turned on, and the first solenoid valve driver 11 is turned on through the two-input OR gate 6, thereby braking the first cylinder 9; the first cylinder 9 is controlled by the first solenoid valve 8 to press down. When the first switch 10 is closed, the second drive switch 18 responds and outputs H. The input of the first inverter 5 is H. Since the input of the second inverter 17 is H, the input L controls the output of the tri-state gate to be in the high-impedance state 16. At this time, the tri-state gate 16 is in the high-impedance state, which is equivalent to disconnecting the output from the outside. Therefore, the H signal output by the second drive switch 18 can control the second solenoid valve driver 12 to turn on the second solenoid valve 15 and brake the second cylinder 13; when the second cylinder 13 presses down until the second switch 14 is disconnected, the first drive switch 4 responds and outputs L, and outputs H to the two-input OR gate 6 through the first inverter 5. The two-input OR gate 6 outputs H, and the first solenoid valve 8 is in the startup state. At this time, both the first solenoid valve 8 and the second solenoid valve 15 are in the startup state, and the process of pressing the test fixture is completed; for the next operation, the second cylinder 13 can be controlled to retract first, and then the first cylinder 9 can be controlled to retract, and the entire control process returns to the initial state.

[0054] It should be noted that the above specific implementation manners are only the preferred embodiments of the present invention and the applied technical principles. Within the technical scope disclosed by the present invention, any changes, modifications, substitutions, combinations, and simplifications made by those skilled in the art without departing from the spirit and principles of the present invention should be equivalent replacement methods and should be covered by the protection scope of the present invention.

Claims

1. A double-cylinder pneumatic solenoid valve linkage control system for a test tooling, characterized in that: It includes an interconnected pneumatic solenoid valve dual braking control module, a safety braking emergency stop control module, and an anti-misoperation control module. The pneumatic solenoid valve dual braking control module includes an interconnected module input end and a first signal inversion control module. The first signal inversion control module is connected to a first buffer and a second inverter. The first buffer is connected to one input end of a two-input OR gate. The other input end of the two-input OR gate is sequentially connected to a first inverter and a first drive switch. The output end of the two-input OR gate is connected to a sequentially interconnected first solenoid valve driver, a delay drive module, a first solenoid valve, and a first cylinder. The second inverter is connected to a tri-state gate. One end of the tri-state gate is connected to a second drive switch. The other end of the tri-state gate is sequentially connected to a second solenoid valve driver, a second solenoid valve, and a second cylinder. The safety braking emergency stop control module includes an emergency stop switch module. The emergency stop switch module is respectively associated with a software interface, a hardware interface, a safety power supply, and a second signal inversion control module. The second signal inversion control module is connected to an exclusive-OR output controller and an output locking component. The anti-misoperation control module is provided with a two-input AND gate. The two-input AND gate is connected to a first start button and a second start button. The first cylinder is connected to a first switch. The second cylinder is connected to a second switch. The first switch is a normally open switch. The second switch is a normally closed switch. When the first cylinder is pressed down under the control of the first solenoid valve and the first switch is closed, the second drive switch responds and outputs H. When the input of the first inverter is H, the input L controls the output of the tri-state gate to be in a high-impedance state. The second solenoid valve driver opens the second solenoid valve and brakes the second cylinder. When the second cylinder is pressed down until the second switch is disconnected, the first drive switch responds and outputs L, and outputs H to the two-input OR gate through the first inverter. The two-input OR gate outputs H, and the first solenoid valve is in a startup state. At this time, both the first solenoid valve and the second solenoid valve are in a startup state. The first switch and the second drive switch have a linkage control relationship. The second switch and the first drive switch have a linkage control relationship.

2. The double-cylinder pneumatic solenoid valve linkage control system for the test tooling according to claim 1, wherein: A third switch is arranged in the software interface. A fourth switch is arranged in the hardware interface. A fifth switch is arranged in the safety power supply. The third switch, the fourth switch, and the fifth switch are all normally closed switches.

3. The double-cylinder pneumatic solenoid valve linkage control system for a test tooling according to claim 2, wherein: The dual-cylinder pneumatic solenoid valve linkage control system further includes an interconnected first start button, a second start button, and an indicator light group. The indicator light group includes a test success indicator light and a test failure indicator light.

4. A control method for a double-cylinder pneumatic solenoid valve linkage control system for a test tooling according to any one of claims 1-3, characterized in that, It includes the following steps: Step 1: A control pulse is input at the module input end, and the control pulse acts on the first signal inversion control module. Step 2: Define H to represent high level and L to represent low level. When the output of the first signal inversion control module is H, the solenoid valve linkage control is started. At this time, the first buffer is turned on, and the first solenoid valve driver is turned on through the two-input OR gate, thereby braking the first cylinder. Step 3: The first cylinder is pressed down under the control of the first solenoid valve. When the first switch is closed, the second drive switch responds and outputs H. Since the input of the first inverter is H, the input L controls the output of the tri-state gate to be in a high-impedance state, and the second solenoid valve driver turns on the second solenoid valve and brakes the second cylinder; Step 4: When the second cylinder is pressed down until the second switch is opened, the first drive switch responds and outputs L, and outputs H to the two-input OR gate through the first inverter. The two-input OR gate outputs H, and the first solenoid valve is in the starting state. At this time, both the first solenoid valve and the second solenoid valve are in the starting state; Step 5: Control the second cylinder to retract first, and then control the first cylinder to retract.

5. The control method according to claim 4, wherein The retraction includes the following steps: Step a: When the first signal flip control module receives a pulse signal, the output flips from H to L. The second drive switch outputs L to the second solenoid valve driver. At this time, the second solenoid valve is turned off, and the second cylinder retracts; Step b: When the second cylinder retracts and returns to its original position, the second switch closes again. The first drive switch outputs H, and outputs L to the two-input OR gate through the first inverter. The two-input OR gate outputs L to control the first solenoid valve driver to turn off the first solenoid valve, and the delay drive module delays the turn-off of the first solenoid valve.

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