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

Abstract

The invention relates to an anti-hand-pressing double-button starting circuit on equipment, and the circuit comprises a button S1 and a button S2 which can receive external pressing and emit 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. Programming design is not needed, and two buttons need to be pressed down at the same time when equipment is started through cooperation of the delay starting circuit and the alarm circuit.

Description

Technical Field

[0001] The present invention relates to the field of semi - automated production and manufacturing, and particularly to an anti - pinch hand button start - up circuit for a device. Background Art

[0002] Semi - automated tooling equipment usually configures double buttons, and both hands are required to press the buttons simultaneously to start the equipment. When employees operate illegally, they often short - circuit or jam one of the button contacts to keep it conducting, thus enabling single - hand pressing to start. When starting with one hand, one hand presses the start button, and the other hand is prone to accidentally touch the non - safe part of the equipment, resulting in being crushed or pinched by the equipment. Such safety risks caused by illegal operations often occur. To solve this problem, the traditional method is generally to connect the double buttons to the input end of the PLC controller for program judgment and error prevention. However, many tooling equipment has limited space and is not suitable for installing a PLC, or has a single function, and using a PLC controller has a high cost and requires programming design, with high requirements. Summary of the Invention

[0003] Objective of the present invention: To overcome the defects of the prior art, the present invention provides an anti - pinch hand double - button start - up circuit for a device. Through the cooperation of a delay start - up circuit and an alarm circuit, it is realized that two buttons need to be pressed simultaneously when the device starts.

[0004] Technical solution of the present invention: An anti - pinch hand double - button start - up circuit for a device, comprising: Button S1 and button S2, which can receive external pressing and emit signals; A delay start - up circuit, which includes a parallel connection of a time - base integrated circuit U4 and a time - base integrated circuit U6, as well as an opto - MOS transistor U3 and a relay K1. The input end of the time - base integrated circuit U4 is connected with an RC circuit 1, and the input end of the time - base integrated circuit U6 is connected with an RC circuit 2. The output ends of the two time - base integrated circuits are connected to the input of the opto - MOS transistor U3, and the output of the opto - MOS transistor U3 is connected to the relay K1. The two RC circuits are respectively used to receive the signals given by button S1 and button S2 and output corresponding voltages to the time - base integrated circuit U4 and the time - base integrated circuit U6. When the two buttons are pressed, the time - base integrated circuit U4 and the time - base integrated circuit U6 output a low level within t seconds of pressing and a high level above t seconds. The opto - MOS transistor U3 is used to receive the output levels of the time - base integrated circuit U4 and the time - base integrated circuit U6. When the two time - base integrated circuits output double low levels, the opto - MOS transistor U3 drives the relay K1 to close; An alarm circuit, which includes a gate circuit U5, a triode Q1, and a buzzer SP1. The gate circuit U5 includes two AND gates, each AND gate having two input ports and one output port. The two input ports of the first AND gate are respectively connected to the button S1 and the output terminal of the time-base integrated circuit U4, and the two input ports of the second AND gate are respectively connected to the button S2 and the output terminal of the time-base integrated circuit U6. The output ports of the two AND gates are connected to the input of the triode Q1, and the output of the triode Q1 is connected to the buzzer SP1. When the button is pressed, a high level is immediately input to one input port of the corresponding AND gate, and 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 high levels are input to both input ports of the AND gate, its output terminal outputs a high level to drive the triode Q1 to drive the buzzer to sound.

[0005] By adopting the above technical solution: The circuit of the present invention is simple, without the need for a PLC controller or an MCU for control, nor programming design. Through the cooperation of the delay start circuit and the alarm circuit, the function of requiring two buttons to be pressed simultaneously when the device starts and released within a specified time, otherwise an alarm will be triggered, effectively avoiding the hand-crushing accident caused by misoperation and improving the safety of the device.

[0006] A further setting of the present invention: t is the full-charge time of the capacitor in the RC circuit.

[0007] By adopting the above further setting, different full-charge times t can be set by adjusting the sizes of the resistor R and the capacitor C, so as to set the time range for the button to be pressed according to actual needs to meet the requirements of different devices or operation scenarios.

[0008] A further setting of the present invention: t is 1 second.

[0009] A further setting of the present invention: The RC circuit one 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 given 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 at the desired voltage U, and the time-base integrated circuit U4 is triggered by the desired voltage U to output a high level; The RC circuit two includes a capacitor C22 and a resistor R22. The capacitor C22 is connected to the output of the button S2, and the voltage output of the resistor R22 is given to the base integrated circuit U6. When the charging time of the capacitor C22 is more than t seconds, the current voltage of the resistor R22 is at the desired voltage U, and the time-base integrated circuit U6 is triggered by the desired voltage U to output a high level.

[0010] With the above further settings, when two buttons S1 and S2 are pressed simultaneously, they start charging capacitors C13 and C22 through RC circuit one and RC circuit two respectively. If both capacitors are charged within the specified time t seconds, the current voltages of resistors R12 and R22 will cause the time - base integrated circuits U4 and U6 to output low levels; while if the charging time of the two capacitors is more than t seconds, the current voltages of resistors R12 and R22 will reach the desired voltage values required to trigger the time - base integrated circuits U4 and U6. At this time, both time - base integrated circuits will output high - level signals. And if the pressing time of any button is more than t seconds without release, or the time difference between the pressing times of the two buttons is more than t seconds, the voltage across the resistor of the RC circuit will also reach the desired voltage U.

[0011] A further setting of the present invention: A diode D7 is connected in series between the output port of RC circuit one and the THOLD port of time - base integrated circuit U4, and a diode D8 is connected in series between the output port of RC circuit two and the THOLD port of time - base integrated circuit U6.

[0012] With the above further settings, the settings of diodes D7 and D8 can ensure that during the charging process of capacitors C13 and C22, the current flows unidirectionally through diodes D7 and D8 to the THOLD ports of time - base integrated circuits U4 and U6. Such a design not only protects the time - base integrated circuits from damage by reverse current.

[0013] A further setting of the present invention: A diode D5 is connected in series between the output port of the first AND gate and the input of triode Q1, and a diode D6 is connected in series between the output port of the second AND gate and the input of triode Q1.

[0014] With the above further settings, the settings of diodes D5 and D6 can ensure that the output signals of the two AND gates are correctly transmitted to triode Q1, while preventing signal interference or reverse current from damaging triode Q1. Through such a circuit design, when both buttons are correctly pressed and exceed the specified time, the two AND gates will output high - level signals simultaneously. Due to the unidirectional conduction characteristics of diodes D5 and D6, these two high - level signals will be combined and transmitted to triode Q1 to trigger the operation of the subsequent circuit. This design not only improves the reliability and stability of the circuit, but also effectively avoids circuit abnormalities caused by misoperation or long - time pressing of the buttons.

[0015] Further setting of the present invention: The product models of the time-base integrated circuit U4 and the time-base integrated circuit U6 are NE555, the product model of the optocoupler MOS transistor U3 is AQW212EHAX, the product model of the relay K1 is HFKW-012-1ZW, the product models of the two AND gates are SN74AC08QPWRQ1, the product model of the triode Q1 is S-LDTD123YLTIG, and the product model of the buzzer SP1 is UGCM1212APB. Description of the Drawings

[0016] Figure 1 is the anti-pinch double-button start circuit diagram of the present invention; Figure 2 is the double-button circuit diagram in the present invention; Figure 3 is the circuit diagram of the time-base integrated circuits U4 and U6 in the delay start circuit of the present invention; Figure 4 is the circuit diagram of the relay K1 in the delay start circuit of the present invention; Figure 5 is the circuit diagram of the gate circuit U5 in the alarm circuit of the present invention; Figure 6 is the circuit diagram of the buzzer SP1 of the present invention. Detailed Embodiment

[0017] Next, the technical solutions in this embodiment will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] As Figures 1-6 shown, an anti-pinch double-button start circuit on a device of the present invention includes: Button S1 and button S2, which can receive external pressing and emit signals; Delayed start circuit, which includes a parallel connection of a timer integrated circuit U4 and a timer integrated circuit U6, as well as an optocoupler MOS transistor U3 and a relay K1. The product models of the timer integrated circuit U4 and the timer integrated circuit U6 are NE555, the product model of the optocoupler MOS transistor U3 is AQW212EHAX, and the product model of the relay K1 is HFKW-012-1ZW. The input end of the timer integrated circuit U4 is connected to an RC circuit 1, and the RC circuit 1 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. A diode D7 is connected in series between the RC circuit 1 and the THOLD port of the timer integrated circuit U4. The input end of the timer integrated circuit U6 is connected to an RC circuit 2, and the RC circuit 2 includes a capacitor C22 and a resistor R22. The capacitor C22 is connected to the output of the button S2, and the voltage output of the resistor R22 is supplied to the base integrated circuit U6. A diode D8 is connected in series between the RC circuit 2 and the THOLD port of the timer integrated circuit U6. After verification, this circuit works fine with imported NE555, and the function is normal. However, when using domestic NE555, the domestic NE555 will be damaged and fail after pressing the button one or two times. After analysis, it is caused by the lack of a negative voltage protection circuit at the input port of the domestic NE555. Connecting a diode in series at the 6PIN foot of the NE555 can effectively protect the NE555. The output ends of the two timer integrated circuits are connected to the input of the optocoupler MOS transistor U3, and the output of the optocoupler MOS transistor U3 is connected to the relay K1. The two RC circuits are respectively used to receive the signals given by the button S1 and the button S2 and output the corresponding voltages to the timer integrated circuit U4 and the timer integrated circuit U6. When the two buttons are pressed, the timer integrated circuit U4 and the timer integrated circuit U6 output a low level within t seconds of pressing down and a high level above t seconds. The optocoupler MOS transistor U3 is used to receive the output levels of the timer integrated circuit U4 and the timer integrated circuit U6. When the two timer integrated circuits output a double low level, the optocoupler MOS transistor U3 drives the relay K1 to close; when the charging time of the capacitor C13 in the RC circuit 1 is above t seconds, the current voltage of the resistor R12 will be at the expected voltage U. At this time, the timer integrated circuit U4 is triggered by the expected voltage U to output a high level, and the optocoupler MOS transistor U3 will drive the relay K1 to bounce open. When the charging time of the capacitor C22 is above t seconds, the current voltage of the resistor R22 will be at the expected voltage U. At this time, the timer integrated circuit U6 is triggered by the expected voltage U to output a high level, and the optocoupler MOS transistor U3 will drive the relay K1 to bounce open. Where t is the full charge time of the capacitor in the RC circuit. t is 1 second.

[0019] Alarm circuit, which includes a gate circuit U5, a triode Q1, and a buzzer SP1. The product model of the triode Q1 is S-LDTD123YLTIG, and the product model of the buzzer SP1 is UGCM1212APB. The gate circuit U5 includes two AND gates, and the product model of the two AND gates is SN74AC08QPWRQ1. Each AND gate has two input ports and one output port. The two input ports of the first AND gate are respectively connected to the button S1 and the output terminal of the time-base integrated circuit U4. The two input ports of the second AND gate are respectively connected to the button S2 and the output terminal of the time-base integrated circuit U6. The output ports of the two AND gates are connected to the input of the triode Q1, and the output of the triode Q1 is connected to the buzzer SP1. When the button is pressed, a high level is immediately input to one input port of the corresponding AND gate, and 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 high levels are input to both input ports of the AND gate, its output terminal outputs a high level to drive the triode Q1 to drive the buzzer to sound. A diode D5 is connected in series between the output port of the first AND gate and the input of the triode Q1, and a diode D6 is connected in series between the output port of the second AND gate and the input of the triode Q1.

[0020] The charging formula of the capacitor in the above RC circuit is: UC = E * [1 - e(-t / RC)], where the time constant of the resistance-capacitance is RC (100000Ω * 0.00001 farad) equal to 1. In about 1 second, the voltage on the capacitor in the RC circuit is approximately equal to 0.63VCC. At this time, the voltage on the resistor is approximately: (1 - 0.63) * 12 = 4.44V. This voltage is approximately equal to the trigger threshold of NE555. Therefore, NE555 will output a high level after 1 second.

[0021] Specific working principle: The core components of this circuit include the button S1 and the button S2. These two buttons can respond to external pressing actions and emit corresponding signals. In addition, the circuit also includes a delay start circuit. The models of the time-base integrated circuit U4 and the time-base integrated circuit U6 are both NE555, and it contains two comparators and an R-S flip-flop inside. The reference voltage of the comparator 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 resistance and capacitance values of the RC circuit, the delay time t of the time-base integrated circuit can be controlled.

[0022] When two buttons are pressed simultaneously or the time difference between pressing and releasing 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 NE555. The timer integrated circuits U4 and U6 will output a low level within t seconds (t = 1 second, which is the full charge time of the capacitor in the RC circuit) after the buttons are pressed. The optocoupler MOS transistor U3 is responsible for receiving the low-level outputs of these two timer integrated circuits and driving the relay K1 to close. After that, when the charging time of the capacitor C13 in RC circuit one reaches or exceeds t seconds, the current voltage across the resistor R12 will reach the desired voltage U. At this time, the timer integrated circuit U4 will be triggered by the desired voltage U and output a high level, and the output terminal of the optocoupler MOS transistor U3 cannot conduct, thus driving the relay K1 to bounce back. Or when the charging time of the capacitor C22 in RC circuit two reaches or exceeds t seconds, it will trigger the timer integrated circuit U6 to output a high level, causing the relay K1 to bounce back. At this time, a complete rising edge and falling edge are achieved, and the device can be started normally. Through this circuit, a start pulse signal can be provided for the device to start the device, and it can cooperate with the functional circuit of the device to realize the complete overall operation process of the device.

[0023] When only one button is pressed and the time exceeds 1 second, when the charging time of the capacitor C13 in RC circuit one reaches or exceeds 1 second, the current voltage across the resistor R12 will reach the desired voltage U. At this time, the timer integrated circuit U4 will be triggered by the desired voltage U and output a high level, and the output terminal of the optocoupler MOS transistor U3 cannot conduct, thus driving the relay K1 to bounce back. Or when the charging time of the capacitor C22 in RC circuit two reaches or exceeds 1 second, it will trigger the timer integrated circuit U6 to output a high level, causing the relay K1 to bounce back. At this time, the device cannot be started normally.

[0024] In addition, this circuit also includes an alarm circuit. Each AND gate has two input ports and one output port. When one of the buttons is pressed, a high level will be immediately input to one of the input ports of the corresponding AND gate. After the button is pressed for more than t seconds, a high level will also be input to the other input port of the corresponding AND gate. When both input ports input high levels, the output port outputs a high level. The triode Q1 is an NPN-type triode, and its base receives the output signal of the gate circuit U5. When the base voltage rises, the triode conducts, thereby driving the buzzer SP1 to sound. Through the cooperation of the delay start circuit and the alarm circuit in the present invention, the function of requiring two buttons to be pressed simultaneously and released within a specified time when starting the device is realized, otherwise an alarm will be given, effectively avoiding the hand-crushing accident caused by misoperation and improving the safety of the device.

[0025] The operation conditions are as follows: 1. When one button is pressed, the relay does not close, and the time exceeds about 1 second, the alarm buzzer will sound an alarm.

[0026] 2. When two buttons are pressed simultaneously, the relay closes. However, if the buttons are held down without being released, after 1 second, the relay pops open and the alarm buzzer will sound an alarm.

[0027] 3. If one button is pressed first and then the other button is pressed within 1 second, the relay closes when the earlier - pressed button has not exceeded 1 second. When the earlier - pressed button exceeds 1 second, the relay pops open and the alarm buzzer will sound an alarm.

Claims

1. A double-button start circuit for preventing pressure on a device, characterized in that: include: Button S1 and button S2, which can receive external pressure and send out signals; The time-delay start circuit includes a time-base integrated circuit U4 and a time-base integrated circuit U6 connected in parallel, an optocoupler MOS tube U3 and a relay K1. The input end of the time-base integrated circuit U4 is connected to an RC circuit 1, the input end of the time-base integrated circuit U6 is connected to an RC circuit 2, the output ends of the two time-base integrated circuits are connected to the input of the optocoupler MOS tube U3, the output of the optocoupler MOS tube U3 is connected to the relay K1, the two RC circuits are used to receive signals from buttons S1 and S2 respectively, and output corresponding voltages to the time-base integrated circuit U4 and the time-base integrated circuit U6. When the two buttons are pressed, the time-base integrated circuit U4 and the time-base integrated circuit U6 output a low level within t seconds, and output a high level for more than t seconds. The optocoupler MOS tube U3 is used to receive the output levels of the time-base integrated circuit U4 and the time-base integrated circuit U6. When the two time-base integrated circuits output double low levels, the optocoupler MOS tube U3 drives the relay K1 to close. The alarm circuit includes a gate circuit U5, a transistor Q1 and a buzzer SP1. The gate circuit U5 includes two AND gates, each of which has two input ports and one output port. The two input ports of the first AND gate are respectively connected to the button S1 and the output end of the time-base integrated circuit U4, and the two input ports of the second AND gate are respectively connected to the button S2 and the output end of the time-base integrated circuit U6. The output ports of the two AND gates are connected to the input of the transistor Q1, and the output of the transistor Q1 is connected to the buzzer SP1. When the button is pressed, a high level is immediately input to one input port of the corresponding AND gate, and a high level is input to the other input port of the corresponding AND gate after the button is pressed for more than t seconds. When high levels are input to both input ports of the AND gate, its output end outputs a high level to drive the transistor Q1 to drive the buzzer to sound.

2. The anti-pressure double button starting circuit on the device according to claim 1 is characterized in that: t is the time it takes for the capacitor in the RC circuit to be fully charged.

3. The anti-pressure double button starting circuit on the device according to claim 2 is characterized in that: t is 1 second.

4. The anti-pressure double button starting circuit on the device according to claim 2 or 3, characterized in that: RC circuit 1 includes capacitor C13 and resistor R12. Capacitor C13 is connected to the output of button S1. The voltage of resistor R12 is output to base integrated circuit U4. When the charging time of capacitor C13 is more than t seconds, the current voltage of resistor R12 is at the expected voltage U. The base integrated circuit U4 is triggered by the expected 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 of resistor R22 is output 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 at the expected voltage U, and the base integrated circuit U6 is triggered by the expected voltage U to output a high level.

5. The anti-pressure double button starting circuit on the device according to claim 1, 2 or 3, characterized in that: A diode D7 is connected in series between the RC circuit 1 and the THOLD port of the timing integrated circuit U4, and a diode D8 is connected in series between the RC circuit 2 and the THOLD port of the timing integrated circuit U6.

6. The anti-pressure double button starting 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 the transistor Q1, and a diode D6 is connected in series between the output port of the second AND gate and the input of the transistor Q1.

7. The anti-pressure double button starting circuit on the device according to claim 1, 2 or 3, characterized in that: The product models of the timing integrated circuit U4 and the timing integrated circuit U6 are NE555, the product model of the optocoupler MOS tube U3 is AQW212EHAX, the product model of the relay K1 is HFKW-012-1ZW, the product models of the two AND gates are SN74AC08QPWRQ1, the product model of the transistor Q1 is S-LDTD123YLTIG, and the product model of the buzzer SP1 is UGCM1212APB.

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