Environment-friendly equipment automatic control circuit for injection molding workshop

Abstract

The utility model discloses an automatic control circuit of environmental protection equipment for an injection molding workshop, which mainly solves the problems that the environmental protection equipment is forgotten to be started and the starting sequence is wrong. The circuit comprises a main control module, and a power-on detection circuit, a power-on trigger circuit, a fault detection circuit and an alarm circuit which are connected with the main control module. The starting detection circuit obtains a current signal when the injection molding machine works through a current transformer, and the main control module receives the amplified current signal, further processes the amplified current signal and then sends the signal to the starting trigger circuit to control the environment-friendly draught fan to be started. And the main control module controls the starting trigger circuit to carry out disconnection operation on the environment-friendly fan. When the injection molding machine is in a normal working state and the fault detection circuit detects that the fan is not normally started, the alarm circuit can send out an alarm signal to inform related personnel to close the injection molding machine. The circuit avoids the phenomena that the environment-friendly equipment is forgotten to be started, the starting sequence is wrong and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic circuits, and specifically relates to an automatic control circuit for environmental protection equipment in an injection molding workshop. Background Art

[0002] Before the injection molding machine in the injection molding workshop is started, the environmental protection equipment needs to be manually turned on before the injection molding equipment can be started; only then can the environmental protection equipment monitor the operating conditions of the injection molding machine. If the operator starts the injection molding machine first and then turns on the environmental protection equipment or forgets to turn on the environmental protection equipment due to negligence, it will cause the monitoring to fail and result in environmental protection complaints. Therefore, it is necessary to design an automatic control circuit for environmental protection equipment to automatically turn on the environmental protection fan when the injection molding machine is started and automatically turn off the environmental protection fan when the injection molding machine is shut down. Content of the Utility Model

[0003] The purpose of the utility model is to provide an automatic control circuit for environmental protection equipment in an injection molding workshop, mainly to solve the problems of forgetting to turn on the environmental protection equipment and incorrect startup sequence.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] An automatic control circuit for environmental protection equipment in an injection molding workshop includes a main control module, a startup detection circuit, a startup trigger circuit, a fault detection circuit, and an alarm circuit connected to the main control module;

[0006] The main control module is used to implement the logical control of the entire circuit;

[0007] The startup detection circuit is used to detect the startup operation state of the injection molding machine;

[0008] The startup trigger circuit is used to control the startup of the environmental protection fan;

[0009] The fault detection circuit is used to detect whether the environmental protection fan is normally started;

[0010] The alarm circuit is used to alarm and notify the failure of the environmental protection fan;

[0011] The startup detection circuit includes a current sampling circuit connected to the injection molding machine, a rectification circuit connected to the current sampling circuit, and an amplification circuit connected to the rectification circuit; among them, the amplification circuit is connected to the main control module.

[0012] Further, in the utility model, the current sampling circuit includes a current transformer L1 connected to the motor of the injection molding machine, a resistor R1 connected in parallel at both ends of the secondary coil of the current transformer L1, a resistor R2 connected to the other end of the resistor R1, and a capacitor C1 connected to the other end of the resistor R2, where the other ends of the resistor R2 and the capacitor C1 are connected and then connected to the rectification circuit.

[0013] Further, in the present utility model, the amplification circuit includes a resistor R3 with one end connected to the rectification circuit, a resistor R4, a capacitor C2, and a capacitor C3 all connected to the other end of the resistor R3, a resistor R5 with one end connected to the other end of the capacitor C2 and the other end grounded, an operational amplifier OP1 with its non-inverting input terminal connected to the common terminal of the capacitor C2 and the resistor R5, a resistor R6 and a resistor R7 both connected to the inverting input terminal of the operational amplifier OP1; wherein, the other end of the capacitor C3 is connected to the other output terminal of the rectification circuit and grounded, the other end of the resistor R6 is grounded, the other ends of the resistor R4 and the resistor R7 are connected to the output terminal of the operational amplifier OP1, and the output terminal of the operational amplifier OP1 is connected to the main control module.

[0014] Further, in the present utility model, the power-on trigger circuit includes a resistor R9 and a resistor R10 connected in series with one end connected to the main control module and the other end grounded, an operational amplifier OP2 with its inverting input terminal connected to the common terminal of the resistor R9 and the resistor R10 and its non-inverting input terminal connected to a 2.5V voltage, an electrolytic capacitor C4 and a resistor R8 connected in parallel with one end connected to the inverting input terminal of the operational amplifier OP2 and the other end connected to the output terminal of the operational amplifier OP2, a diode D1 and a resistor R11 connected in series in sequence with the output terminal of the operational amplifier OP2, a current source Is connected to the positive electrode of the diode D1 and the output terminal of the operational amplifier OP2, and a resistor R12 and a breakdown diode D2 connected in parallel with one end connected to the other end of the resistor R11 and the other end grounded; wherein, the positive electrode of the breakdown diode D2 is grounded; the negative electrode of the breakdown diode D2 serves as the output terminal of the power-on trigger circuit and is connected to an external environmental protection fan.

[0015] Further, in the present utility model, the fault detection circuit includes a resistor R13 connected to the main control module, a capacitor C5, a resistor R14, and a diode D3 connected to the other end of the resistor R13, a triode Q1 with its base connected to the other end of the resistor R14, a resistor R15 connected between the base and the emitter of the triode Q1, and a resistor R16 with one end connected to the collector of the triode Q1 and the other end connected to an external power supply VCC terminal; wherein, the other end of the capacitor C5 is grounded, the negative electrode of the diode D3 is grounded; the emitter of the triode Q1 is connected to an external environmental protection branch machine.

[0016] Further, in the present utility model, the alarm circuit includes a reference voltage chip U1, a comparator A1 with its non-inverting input terminal connected to the reference voltage chip U1, voltage-dividing resistors R17 and R18 connected to the non-inverting input terminal of the comparator A1, a diode D4 with its positive electrode connected to the output terminal of the comparator A1, a resistor R20 connected to the negative electrode of the diode D4, a resistor R19 with one end connected to the resistor R20 and the other end connected to the positive electrode of the diode D4, and a light-emitting diode D5 with its positive electrode connected to the negative electrode of the diode D4 and its negative electrode connected to the positive electrode of the diode D4; wherein, the other end of the voltage-dividing resistor R17 is connected to the main control module, and the other end of the voltage-dividing resistor R18 is grounded; the common terminal of the resistors R19 and R20 is connected to the main control module.

[0017] Compared with the prior art, the present utility model has the following beneficial effects:

[0018] (1) Aiming at the environmental protection complaint problem caused by the non-operation of the environmental protection fan during the operation of the injection molding machine, the present utility model selects a conventional main control module and designs a power-on trigger circuit, a fault detection circuit, and an alarm circuit with the power-on detection circuit as the core. Among them, the main control module is used to realize the logical control of the entire circuit; the power-on detection circuit is used to detect the power-on operation state of the injection molding machine; the power-on trigger circuit is used to control the opening of the environmental protection fan; the fault detection circuit is used to detect whether the environmental protection fan is normally opened; the alarm circuit is used to alarm and notify the environmental protection fan failure. The power-on detection circuit uses a current transformer to obtain the current signal during the operation of the injection molding machine, and this signal enters the main control module after rectification and amplification. The main control module processes this signal and then sends a signal to the power-on trigger circuit to control the opening of the environmental protection fan. When the current sampling circuit does not detect the relevant current signal, the main control module controls the power-on trigger circuit to disconnect the environmental protection fan. When the injection molding machine is in a normal working state and the fault detection circuit detects that the fan is not normally opened, the alarm circuit will send an alarm signal to notify the relevant personnel to shut down the injection molding machine. This circuit eliminates the phenomena of forgetting to turn on the environmental protection equipment and incorrect power-on sequence; now the control circuit is changed, and the original manual opening is changed to automatic control, and the environmental protection fan failure alarm device is immediately executed; in order to achieve the purpose of automatically controlling the equipment and eliminating environmental protection complaints. At the same time, it also reduces the manual operation process of the operator to turn on the environmental protection equipment and improves work efficiency.

[0019] (2) The present utility model has a low input cost. Changing from manual operation to automatic control has a low input cost. When changing to automatic operation, only need to check the main power switch of the control panel and turn it to automatic. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the circuit schematic diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. The implementation manners of the present utility model include but are not limited to the following embodiments.

[0022] Embodiment

[0023] As Figure 1 shown, an automatic control circuit of an environmental protection device for an injection molding workshop disclosed by the present utility model includes a main control module, a power-on detection circuit, a power-on trigger circuit, a fault detection circuit and an alarm circuit connected to the main control module; the main control module is used to realize the logical control of the entire circuit; the power-on detection circuit is used to detect the power-on operation state of the injection molding machine; the power-on trigger circuit is used to control the opening of the environmental protection fan; the fault detection circuit is used to detect whether the environmental protection fan is normally opened; the alarm circuit is used to alarm and notify the fault of the environmental protection fan. Among them, the model of the main control module is C8051F020. In order to prevent the phenomenon of forgetting to turn on the environmental protection device and incorrect power-on sequence, the control circuit is now changed, and the original manual opening is changed to automatic control. When the environmental protection fan fails, the alarm device will execute immediately; in order to achieve the purpose of automatic control of the device and prevent environmental protection complaints. At the same time, it also reduces the process of operators manually turning on the environmental protection device and improves work efficiency.

[0024] In this embodiment, the power-on detection circuit includes a current sampling circuit connected to the injection molding machine, a rectification circuit connected to the current sampling circuit, and an amplification circuit connected to the rectification circuit; among them, the amplification circuit is connected to the main control module. The current sampling circuit includes a current transformer L1 connected to the motor of the injection molding machine, a resistor R1 connected in parallel at both ends of the secondary coil of the current transformer L1, a resistor R2 connected to the other end of the resistor R1, and a capacitor C1 connected to the other end of the resistor R2. Among them, the other ends of the resistor R2 and the capacitor C1 are connected and then connected to the rectification circuit. Among them, the current sampling circuit obtains a current signal from the power transmission line of the injection molding machine through the current transformer L1, and the current signal enters the amplification circuit after being rectified by an existing conventional rectifier bridge.

[0025] In this embodiment, the amplification circuit includes a resistor R3 with one end connected to the rectification circuit, a resistor R4, a capacitor C2, and a capacitor C3 all connected to the other end of the resistor R3, a resistor R5 with one end connected to the other end of the capacitor C2 and the other end grounded, an operational amplifier OP1 with the positive input terminal connected to the common terminal of the capacitor C2 and the resistor R5, resistors R6 and R7 both connected to the inverting input terminal of the operational amplifier OP1; among them, the other end of the capacitor C3 is connected to the other output terminal of the rectification circuit and grounded, the other end of the resistor R6 is grounded, the other ends of the resistor R4 and the resistor R7 are connected to the output terminal of the operational amplifier OP1, and the output terminal of the operational amplifier OP1 is connected to the main control module. The rectified sampling signal is filtered and amplified by the amplification circuit and then input to the main control module.

[0026] In this embodiment, the power-on trigger circuit includes resistors R9 and R10 connected in series with one end connected to the main control module and the other end grounded, an operational amplifier OP2 with its inverting input terminal connected to the common terminal of resistors R9 and R10 and its non-inverting input terminal connected to a 2.5V voltage, an electrolytic capacitor C4 and a resistor R8 connected in parallel with one end connected to the inverting input terminal of the operational amplifier OP2 and the other end connected to the output terminal of the operational amplifier OP2, a diode D1 and a resistor R11 connected in series in sequence with the output terminal of the operational amplifier OP2, a current source Is connected to the positive electrode of the diode D1 and the output terminal of the operational amplifier OP2, and a resistor R12 and a breakdown diode D2 connected in parallel with one end connected to the other end of the resistor R11 and the other end grounded; wherein, the positive electrode of the breakdown diode D2 is grounded; the negative electrode of the breakdown diode D2 serves as the output terminal of the power-on trigger circuit and is connected to an external environmental protection fan. The power-on trigger circuit receives a control signal from the main control module. When the power-on detection circuit uses a current transformer to obtain the current signal during the operation of the injection molding machine, this signal is rectified and amplified and then enters the main control module. After the main control module receives this signal and processes it further, it sends a signal to the power-on trigger circuit to control the opening of the environmental protection fan. When the current sampling circuit does not detect the relevant current signal, the main control module controls the power-on trigger circuit to disconnect the environmental protection fan.

[0027] In this embodiment, the fault detection circuit includes a resistor R13 connected to the main control module, a capacitor C5, a resistor R14, and a diode D3 connected to the other end of the resistor R13, a triode Q1 with its base connected to the other end of the resistor R14, a resistor R15 connected between the base and the emitter of the triode Q1, and a resistor R16 with one end connected to the collector of the triode Q1 and the other end connected to the external power supply VCC terminal; wherein, the other end of the capacitor C5 is grounded, and the negative electrode of the diode D3 is grounded. When the fault detection circuit detects that the fan fails to start normally, the alarm circuit will send an alarm signal to notify relevant personnel to shut down the injection molding machine.

[0028] In this embodiment, the alarm circuit includes a reference voltage chip U1, a comparator A1 with its non-inverting input terminal connected to the reference voltage chip U1, voltage-dividing resistors R17 and R18 connected to the non-inverting input terminal of the comparator A1, a diode D4 with its positive electrode connected to the output terminal of the comparator A1, a resistor R20 connected to the negative electrode of the diode D4, a resistor R19 with one end connected to the resistor R20 and the other end connected to the positive electrode of the diode D4, and a light-emitting diode D5 with its positive electrode connected to the negative electrode of the diode D4 and its negative electrode connected to the positive electrode of the diode D4; wherein, the other end of the voltage-dividing resistor R17 is connected to the main control module, and the other end of the voltage-dividing resistor R18 is grounded; the common terminal of the resistors R19 and R20 is connected to the main control module. The alarm circuit alarms after receiving the environmental protection fan fault signal sent by the main control module to remind the staff to check the environmental protection fan.

[0029] Through the above design, this circuit eliminates the phenomena of forgetting to turn on the environmental protection equipment and incorrect startup sequence; now the control circuit is changed, the original manual startup is changed to automatic control, and the failure alarm device of the environmental protection fan is immediately executed; so as to achieve the purpose of automatically controlling the equipment and eliminating environmental protection complaints. At the same time, it also reduces the process of operators manually turning on the environmental protection equipment and improves work efficiency.

[0030] The above embodiments are only one of the preferred embodiments of the present invention and should not be used to limit the protection scope of the present invention. Any meaningless changes or polish made on the main design concept and spirit of the present invention, as long as the technical problems solved are still consistent with the present invention, should be included in the protection scope of the present invention.

Claims

1. An automatic control circuit for an environmental protection device in an injection molding workshop, characterized in that, It includes a main control module, a power-on detection circuit, a power-on trigger circuit, a fault detection circuit, and an alarm circuit connected to the main control module; The main control module is used to implement the logical control of the entire circuit; The power-on detection circuit is used to detect the power-on operation status of the injection molding machine; The power-on trigger circuit is used to control the startup of the environmental protection fan; The fault detection circuit is used to detect whether the environmental protection fan is normally started; The alarm circuit is used to alarm and notify the failure of the environmental protection fan; The power-on detection circuit includes a current sampling circuit connected to the injection molding machine, a rectification circuit connected to the current sampling circuit, and an amplification circuit connected to the rectification circuit; among them, the amplification circuit is connected to the main control module.

2. The automatic control circuit of an environmental protection device for an injection molding workshop according to claim 1, wherein, The current sampling circuit includes a current transformer L1 connected to the motor of the injection molding machine, a resistor R1 connected in parallel across the secondary coil of the current transformer L1, a resistor R2 connected to the other end of the resistor R1, and a capacitor C1 connected to the other end of the resistor R2. Among them, the other ends of the resistor R2 and the capacitor C1 are connected and then connected to the rectification circuit.

3. The automatic control circuit of an environmental protection device for an injection molding workshop according to claim 2, characterized in that, The amplification circuit includes a resistor R3 with one end connected to the rectification circuit, a resistor R4, a capacitor C2, and a capacitor C3 all connected to the other end of the resistor R3, a resistor R5 with one end connected to the other end of the capacitor C2 and the other end grounded, an operational amplifier OP1 with the non-inverting input terminal connected to the common terminal of the capacitor C2 and the resistor R5, resistors R6 and R7 both connected to the inverting input terminal of the operational amplifier OP1; among them, the other end of the capacitor C3 is connected to the other output terminal of the rectification circuit and grounded, the other end of the resistor R6 is grounded, the other ends of the resistor R4 and the resistor R7 are connected to the output terminal of the operational amplifier OP1, and the output terminal of the operational amplifier OP1 is connected to the main control module.

4. The automatic control circuit of an environmental protection device for an injection molding workshop according to claim 3, characterized in that, The power-on trigger circuit includes resistors R9 and R10 connected in series with one end connected to the main control module and the other end grounded, an operational amplifier OP2 with the inverting input terminal connected to the common terminal of the resistors R9 and R10 and the non-inverting input terminal connected to a 2.5V voltage, an electrolytic capacitor C4 and a resistor R8 connected in parallel with one end connected to the inverting input terminal of the operational amplifier OP2 and the other end connected to the output terminal of the operational amplifier OP2, a diode D1 and a resistor R11 connected in series in sequence with the output terminal of the operational amplifier OP2, a current source Is connected to the positive electrode of the diode D1 and the output terminal of the operational amplifier OP2, and resistors R12 and a breakdown diode D2 connected in parallel with one end connected to the other end of the resistor R11 and the other end grounded; among them, the positive electrode of the breakdown diode D2 is grounded; the negative electrode of the breakdown diode D2 is used as the output terminal of the power-on trigger circuit and is connected to the external environmental protection fan.

5. The automatic control circuit of an environmental protection device for an injection molding workshop according to claim 4, wherein, The fault detection circuit includes a resistor R13 connected to the main control module, a capacitor C5, a resistor R14, and a diode D3 connected to the other end of the resistor R13, a triode Q1 with its base connected to the other end of the resistor R14, a resistor R15 connected between the base and the emitter of the triode Q1, and a resistor R16 with one end connected to the collector of the triode Q1 and the other end connected to the external power supply VCC terminal; wherein, the other end of the capacitor C5 is grounded, and the negative electrode of the diode D3 is grounded; the emitter of the triode Q1 is connected to the external environmental protection extension machine.

6. The automatic control circuit of an environmental protection device for an injection molding workshop according to claim 5, characterized in that, The alarm circuit includes a reference voltage chip U1, a comparator A1 with its non-inverting input terminal connected to the reference voltage chip U1, voltage-dividing resistors R17, R18 connected to the non-inverting input terminal of the comparator A1, a diode D4 with its positive electrode connected to the output terminal of the comparator A1, a resistor R20 connected to the negative electrode of the diode D4, a resistor R19 with one end connected to the resistor R20 and the other end connected to the positive electrode of the diode D4, and a light-emitting diode D5 with its positive electrode connected to the negative electrode of the diode D4 and its negative electrode connected to the positive electrode of the diode D4; wherein, the other end of the voltage-dividing resistor R17 is connected to the main control module, and the other end of the voltage-dividing resistor R18 is grounded; the common terminal of the resistors R19, R20 is connected to the main control module.

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