Hand-pressing-prevention double-button starting circuit on equipment

Abstract

The utility model relates to an anti-hand-pressing double-button starting circuit on equipment, which comprises a button S1 and a button S2 which can receive external pressing to send out a signal; the delay starting circuit comprises a time-base integrated circuit U4 and a time-base integrated circuit U6 which are connected in parallel, an optocoupler MOS tube U3 and a relay K1, the alarm circuit comprises a gate circuit U5, a triode Q1 and a buzzer SP1, the gate circuit U5 comprises two AND gates, each AND gate is provided with two input ports and one output port, and the triode Q1 is connected with the buzzer SP1. Two input ports of the first AND gate are respectively connected with the button S1 and the output end of the time-base integrated circuit U4, and two input ports of the second AND gate are respectively connected with the button S2 and the output end of the time-base integrated circuit U6. According to the utility model, programming design is not needed, and through cooperation of the delay starting circuit and the alarm circuit, two buttons need to be pressed at the same time when equipment is started.

Description

Technical Field

[0001] This utility model relates to the field of semi-automated production and manufacturing, and in particular to an anti-press button start circuit on a piece of equipment. Background Technology

[0002] Semi-automatic tooling equipment is typically equipped with two buttons, requiring both hands to press simultaneously to start the equipment. When employees violate operating procedures, they often short-circuit or jam one of the button contacts to maintain its conductivity, thus turning it into a one-handed start-up. During one-handed start-up, one hand is pressing the button, while the other hand is prone to accidentally touching unsafe parts of the equipment, leading to injuries such as being crushed or pinched. Such safety risks from improper operation are frequent. To solve this problem, the traditional approach is to connect the two buttons to the input of a PLC controller for program-based error prevention. However, many tooling machines have limited space, making PLC installation unsuitable, or their functions are limited, and using a PLC controller would be costly and require sophisticated programming design. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art by providing a dual-button start circuit for preventing hand pressure on equipment. Through the cooperation of a delayed start circuit and an alarm circuit, it is possible to make two buttons press simultaneously when the equipment is started.

[0004] The technical solution of this utility model: a dual-button start circuit for preventing hand pressure on equipment, comprising:

[0005] Buttons S1 and S2 can receive external pressure and send signals;

[0006] The delayed start circuit includes two timer ICs, U4 and U6, connected in parallel, as well as an optocoupler MOSFET U3 and a relay K1. The input of timer IC U4 is connected to RC circuit one, and the input of timer IC U6 is connected to RC circuit two. The outputs of the two timer ICs are connected to the input of optocoupler MOSFET U3, and the output of optocoupler MOSFET U3 is connected to relay K1. The two RC circuits are used to receive the signals given by buttons S1 and S2, respectively, and output the corresponding voltages to timer ICs U4 and U6. When the two buttons are pressed, timer ICs U4 and U6 output a low level within t seconds of being pressed and a high level after t seconds. Optocoupler MOSFET U3 is used to receive the output levels of timer ICs U4 and U6. When the two timer ICs output double low levels, optocoupler MOSFET U3 drives relay K1 to close.

[0007] The alarm circuit includes gate circuit U5, transistor Q1, and buzzer SP1. Gate circuit U5 includes two AND gates, each with two input ports and one output port. The two input ports of the first AND gate are connected to the button S1 and the output of the timer IC U4, respectively. The two input ports of the second AND gate are connected to the button S2 and the output of the timer IC U6, respectively. The output ports of the two AND gates are connected to the input of transistor Q1, and the output of transistor Q1 is connected to buzzer SP1. When the button is pressed, a high level is immediately input to one input port of the corresponding AND gate. After the button is pressed for more than t seconds, a high level is input to the other input port of the corresponding AND gate. When both input ports of the AND gate are high, its output terminal outputs a high level to drive transistor Q1 and make the buzzer sound.

[0008] By adopting the above technical solution, this utility model features a simple circuit that requires no PLC controller or MCU control, and no programming design. Through the cooperation of a delayed start circuit and an alarm circuit, it achieves the function of requiring two buttons to be pressed simultaneously during equipment startup and released within a specified time, otherwise an alarm will sound. This effectively avoids accidents caused by misoperation and improves equipment safety.

[0009] A further setting of this invention: t is the full charging time of the capacitor in the RC circuit.

[0010] By further configuring the above settings, different charging times t can be set by adjusting the values ​​of resistor R and capacitor C, thereby setting the range of time the button needs to be pressed according to actual requirements, in order to adapt to the needs of different devices or operating scenarios.

[0011] A further setting of this utility model: t is 1 second.

[0012] A further feature of this invention: The RC circuit includes a capacitor C13 and a resistor R12. The capacitor C13 is connected to the output of the button S1, and the voltage output of the resistor R12 is supplied to the base integrated circuit U4. When the charging time of the capacitor C13 is more than t seconds, the current voltage of the resistor R12 is made to be at the desired voltage U. The base integrated circuit U4 is triggered by the desired voltage U to output a high level.

[0013] RC circuit 2 includes capacitor C22 and resistor R22. Capacitor C22 is connected to the output of button S2, and the voltage output of resistor R22 is supplied to the base integrated circuit U6. When the charging time of capacitor C22 is more than t seconds, the current voltage of resistor R22 is made to be at the desired voltage U. The base integrated circuit U6 is triggered by the desired voltage U to output a high level.

[0014] With the above further configuration, when both buttons S1 and S2 are pressed simultaneously, they begin charging capacitors C13 and C22 through RC circuit one and RC circuit two, respectively. If both capacitors charge within the specified time t seconds, the current voltage of resistors R12 and R22 will cause the timer ICs U4 and U6 to output a low level. If the charging time of the two capacitors is longer than t seconds, the current voltage of resistors R12 and R22 will reach the desired voltage value required to trigger the timer ICs U4 and U6. At this time, both timer ICs will output a high-level signal. Furthermore, if either button is pressed for more than t seconds without being released, or if the time difference between pressing the two buttons is more than t seconds, the voltage across the resistors in the RC circuits will also reach the desired voltage U.

[0015] A further feature of this invention is that a diode D7 is connected in series between RC circuit one and the THOLD port of the timer integrated circuit U4, and a diode D8 is connected in series between RC circuit two and the THOLD port of the timer integrated circuit U6.

[0016] With the further configuration described above, the placement of diodes D7 and D8 ensures that during the charging process of capacitors C13 and C22, current flows unidirectionally through diodes D7 and D8 to the THOLD ports of the timer ICs U4 and U6. This design not only protects the timer ICs from damage caused by reverse current.

[0017] A further feature of this invention is that a diode D5 is connected in series between the output port of the first AND gate and the input of transistor Q1, and a diode D6 is connected in series between the output port of the second AND gate and the input of transistor Q1.

[0018] By further configuring diodes D5 and D6, the output signals of the two AND gates are ensured to be correctly transmitted to transistor Q1, while preventing signal interference or reverse current from damaging Q1. With this circuit design, when both buttons are correctly pressed for a specified time, both AND gates will simultaneously output high-level signals. Due to the unidirectional conduction characteristics of diodes D5 and D6, these two high-level signals will be combined and transmitted to transistor Q1, triggering the operation of subsequent circuits. This design not only improves the reliability and stability of the circuit but also effectively avoids circuit malfunctions caused by misoperation or prolonged button pressing.

[0019] Further details of this invention: the product models of timer integrated circuits U4 and U6 are NE555, the product model of optocoupler MOSFET U3 is AQW212EHAX, the product model of relay K1 is HFKW-012-1ZW, the product models of the two AND gates are SN74AC08QPWRQ1, the product model of transistor Q1 is S-LDTD123YLTIG, and the product model of buzzer SP1 is UGCM1212APB. Attached Figure Description

[0020] Figure 1 This is the circuit diagram for the anti-pressure hand dual-button start circuit of this utility model;

[0021] Figure 2 This is the circuit diagram of the dual-button design in this utility model;

[0022] Figure 3 This is a circuit diagram of the timer integrated circuits U4 and U6 in the delayed start circuit of this utility model;

[0023] Figure 4 This is the circuit diagram of relay K1 in the delayed start circuit of this utility model;

[0024] Figure 5 This is the circuit diagram of gate circuit U5 in the alarm circuit of this utility model;

[0025] Figure 6 This is the circuit diagram of the buzzer SP1 of this utility model. Detailed Implementation

[0026] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] like Figure 1-6 As shown, a dual-button anti-pinch start circuit for a device according to this utility model includes:

[0028] Buttons S1 and S2 can receive external pressure and send signals;

[0029] The delayed start circuit includes timer ICs U4 and U6 connected in parallel, an optocoupler MOSFET U3, and a relay K1. The product models of timer ICs U4 and U6 are NE555, the product model of optocoupler MOSFET U3 is AQW212EHAX, and the product model of relay K1 is HFKW-012-1ZW. An RC circuit is connected to the input of timer IC U4. RC circuit one includes a capacitor C13 and a resistor R12. Capacitor C13 is connected to the output of button S1, and the voltage output of resistor R12 is supplied to timer IC U4. A series circuit is connected between RC circuit one and the THOLD port of timer IC U4. A diode D7 is connected to the input terminal of the timer IC U6, which is connected to RC circuit two. RC circuit two includes capacitor C22 and resistor R22. Capacitor C22 is connected to the output of button S2, and the voltage output of resistor R22 is supplied to the timer IC U6. A diode D8 is connected in series between RC circuit two and the THOLD port of timer IC U6. It has been verified that this circuit works fine with imported NE555, but when using domestic NE555, the domestic NE555 will be damaged and fail after the button is pressed once or twice. After analysis, it was found that the domestic NE555 lacks a negative voltage protection circuit at the input port. Connecting a diode in series with pin 6 of the NE555 can effectively protect the NE555. The outputs of the two timer ICs are connected to the inputs of optocoupler MOSFET U3, and the outputs of optocoupler MOSFET U3 are connected to relay K1. Two RC circuits are used to receive signals from buttons S1 and S2 respectively, and output corresponding voltages to timer ICs U4 and U6. When the two buttons are pressed, timer ICs U4 and U6 output a low level within t seconds of being pressed, and a high level after t seconds. Optocoupler MOSFET U3 is used to receive the output levels of timer ICs U4 and U6. When both outputs are low, optocoupler MOSFET U3 drives relay K1 to close. When the charging time of capacitor C13 in RC circuit 1 is greater than t seconds, the current voltage of resistor R12 will be at the desired voltage U. At this time, the timer IC U4 is triggered by the desired voltage U to output a high level, and optocoupler MOSFET U3 will drive relay K1 to open. When the charging time of capacitor C22 is greater than t seconds, the current voltage of resistor R22 will be at the desired voltage U. At this time, the timer IC U6 is triggered by the desired voltage U to output a high level, and optocoupler MOSFET U3 will drive relay K1 to open. Here, t is the full charging time of the capacitors in the RC circuit. t is 1 second.

[0030] The alarm circuit includes gate circuit U5, transistor Q1, and buzzer SP1. The product model of transistor Q1 is S-LDTD123YLTIG, and the product model of buzzer SP1 is UGCM1212APB. Gate circuit U5 includes two AND gates, product model SN74AC08QPWRQ1. Each AND gate has two input ports and one output port. The two input ports of the first AND gate are connected to the button S1 and the output of the timer IC U4, respectively. The two input ports of the second AND gate are connected to the button S2 and the output of the timer IC U6, respectively. The output ports of the two AND gates are connected to the input of transistor Q1, and the output of transistor Q1 is connected to buzzer SP1. When the button is pressed, a high level is immediately input to one input port of the corresponding AND gate. After the button is pressed for more than t seconds, a high level is input to the other input port of the corresponding AND gate. When both input ports of the AND gate are high level, its output terminal outputs a high level to drive transistor Q1 and make the buzzer sound. A diode D5 is connected in series between the output port of the first AND gate and the input of transistor Q1, and a diode D6 is connected in series between the output port of the second AND gate and the input of transistor Q1.

[0031] The charging formula for the capacitor in the above RC circuit is: UC=E*[1-e(-t / RC)], where the RC time constant is RC(100000Ω*0.00001 Farad) equals 1. In about 1 second, the voltage across the capacitor in the RC circuit is approximately 0.63VCC. At this time, the voltage across the resistor is approximately: (1-0.63)*12=4.44V. This voltage is approximately equal to the trigger threshold of NE555, so NE555 will output a high level after 1 second.

[0032] Specific working principle:

[0033] The core components of this circuit include buttons S1 and S2, which respond to external pressing actions and emit corresponding signals. In addition, the circuit includes a delay-start circuit. The timer ICs U4 and U6 are both NE555, containing two comparators and an RS flip-flop. The reference voltage of the comparators is determined by the resistor and capacitor of the RC circuit. When the input voltage is greater than the reference voltage, the comparator outputs a low level; otherwise, it outputs a high level. By adjusting the values ​​of the resistor and capacitor in the RC circuit, the delay time t of the timer IC can be controlled.

[0034] When both buttons are pressed simultaneously or the time difference between pressing them is no more than 1 second, the capacitor in the RC circuit is charged. The voltage across the resistor in the RC circuit serves as the trigger condition for the NE555. The timing ICs U4 and U6 will output a low level within t seconds (t being 1 second, i.e., the full charging time of the capacitor in the RC circuit) when the button is pressed. The optocoupler MOSFET U3 receives the low-level outputs from these two timing ICs, driving relay K1 to close. Afterwards, when the charging time of capacitor C13 in RC circuit one reaches or exceeds t seconds, the current voltage of resistor R12 will reach the desired voltage U. At this time, timing IC U4 will be triggered by the desired voltage U and output a high level. The output of optocoupler MOSFET U3 will not conduct, thus driving relay K1 to open. Alternatively, when the charging time of capacitor C22 in RC circuit two reaches or exceeds t seconds, it will trigger timing IC U6 to output a high level, causing relay K1 to open. This achieves a complete rising and falling edge, allowing the device to start normally. This circuit provides a start-up pulse signal for device startup and can be used in conjunction with the device's functional circuits to achieve a complete overall device operation process.

[0035] When only one button is pressed for more than 1 second, when the charging time of capacitor C13 in RC circuit one reaches or exceeds 1 second, the current voltage of resistor R12 will reach the desired voltage U. At this time, the timer IC U4 will be triggered by the desired voltage U and output a high level. The output terminal of optocoupler MOSFET U3 cannot be turned on, thereby driving relay K1 to open. Alternatively, when the charging time of capacitor C22 in RC circuit two reaches or exceeds 1 second, it will trigger the timer IC U6 to output a high level, causing relay K1 to open. At this time, the device cannot start normally.

[0036] In addition, this circuit includes an alarm circuit. Each AND gate has two input ports and one output port. When one button is pressed, one input port of the corresponding AND gate immediately receives a high level. After the button has been pressed for more than t seconds, the other input port of the corresponding AND gate also receives a high level. When both input ports receive high levels, the output port outputs a high level. Transistor Q1 is an NPN transistor, and its base receives the output signal of gate circuit U5. When the base voltage rises, the transistor conducts, thereby driving buzzer SP1 to sound. This invention, through the cooperation of a delayed start circuit and an alarm circuit, achieves the function that requires two buttons to be pressed simultaneously when the equipment is started, and released within a specified time, otherwise an alarm will sound. This effectively avoids accidents caused by accidental pressing of buttons and improves the safety of the equipment.

[0037] The operation is as follows:

[0038] 1. If a button is pressed and the relay does not close for more than one second, the alarm buzzer will sound.

[0039] 2. When both buttons are pressed at the same time, the relay closes; however, if the buttons are held down for more than 1 second, the relay will pop open, and the alarm buzzer will sound.

[0040] 3. If one button is pressed first, and another button is pressed within 1 second, the relay will close if the first button is pressed within 1 second; if the first button is pressed for more than 1 second, the relay will open, and the alarm buzzer will sound.

Claims

1. A dual-button start circuit for preventing hand pressure on equipment, characterized in that, include: Buttons S1 and S2 can receive external pressure and emit signals; The delayed start circuit includes two timer ICs, U4 and U6, connected in parallel, as well as an optocoupler MOSFET U3 and a relay K1. The input of timer IC U4 is connected to RC circuit one, and the input of timer IC U6 is connected to RC circuit two. The outputs of the two timer ICs are connected to the input of optocoupler MOSFET U3, and the output of optocoupler MOSFET U3 is connected to relay K1. The two RC circuits are used to receive the signals given by buttons S1 and S2, respectively, and output the corresponding voltages to timer ICs U4 and U6. When the two buttons are pressed, timer ICs U4 and U6 output a low level within t seconds of being pressed and a high level after t seconds. Optocoupler MOSFET U3 is used to receive the output levels of timer ICs U4 and U6. When the two timer ICs output double low levels, optocoupler MOSFET U3 drives relay K1 to close. The alarm circuit includes gate circuit U5, transistor Q1, and buzzer SP1. Gate circuit U5 includes two AND gates, each with two input ports and one output port. The two input ports of the first AND gate are connected to the button S1 and the output of the timer IC U4, respectively. The two input ports of the second AND gate are connected to the button S2 and the output of the timer IC U6, respectively. The output ports of the two AND gates are connected to the input of transistor Q1, and the output of transistor Q1 is connected to buzzer SP1. When the button is pressed, a high level is immediately input to one input port of the corresponding AND gate. After the button is pressed for more than t seconds, a high level is input to the other input port of the corresponding AND gate. When both input ports of the AND gate are high, its output terminal outputs a high level to drive transistor Q1 and make the buzzer sound.

2. The anti-pinch hand dual-button start circuit on the device according to claim 1, characterized in that: t is the time it takes for the capacitor in the RC circuit to fully charge.

3. The anti-pinch hand dual-button start circuit on the device according to claim 2, characterized in that: t is 1 second.

4. The anti-pinch hand dual-button start circuit on the device according to claim 2 or 3, characterized in that: The RC circuit includes a capacitor C13 and a resistor R12. The capacitor C13 is connected to the output of the button S1, and the voltage output of the resistor R12 is supplied to the base integrated circuit U4. When the charging time of the capacitor C13 is more than t seconds, the current voltage of the resistor R12 is made to be at the desired voltage U. The base integrated circuit U4 is triggered by the desired voltage U to output a high level. RC circuit 2 includes capacitor C22 and resistor R22. Capacitor C22 is connected to the output of button S2, and the voltage output of resistor R22 is supplied to the base integrated circuit U6. When the charging time of capacitor C22 is more than t seconds, the current voltage of resistor R22 is made to be at the desired voltage U. The base integrated circuit U6 is triggered by the desired voltage U to output a high level.

5. The anti-pinch hand dual-button start circuit on the device according to claim 1, 2, or 3, characterized in that: A diode D7 is connected in series between RC circuit one and the THOLD port of timer IC U4, and a diode D8 is connected in series between RC circuit two and the THOLD port of timer IC U6.

6. The anti-pinch hand dual-button start circuit on the device according to claim 1, 2, or 3, characterized in that: A diode D5 is connected in series between the output port of the first AND gate and the input of transistor Q1, and a diode D6 is connected in series between the output port of the second AND gate and the input of transistor Q1.

7. The anti-pinch hand dual-button start circuit on the device according to claim 1, 2, or 3, characterized in that: The product models of timer ICs U4 and U6 are NE555, the product model of optocoupler MOSFET U3 is AQW212EHAX, the product model of relay K1 is HFKW-012-1ZW, the product models of the two AND gates are SN74AC08QPWRQ1, the product model of transistor Q1 is S-LDTD123YLTIG, and the product model of buzzer SP1 is UGCM1212APB.

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