Safety control circuit and safety control system

Abstract

The utility model discloses a safety control circuit and a safety control system. The safety control circuit is connected with semi-automatic equipment and / or automatic equipment, the safety control circuit comprises a door switch, a start key, a reset key, a locking relay, a safety relay, a buzzer and three-color lamps, and the three-color lamps comprise a red lamp, a yellow lamp and a green lamp; the safety relay is used for cutting off an equipment power source, the locking relay is used for locking the equipment power source, and the red lamp is used for door opening and closing action and lighting when receiving an external fault signal; the start key is used for starting the semi-automatic equipment and / or the automatic equipment, the green light is used for emitting light when the semi-automatic equipment and / or the automatic equipment normally works, and the yellow light is used for emitting light when the semi-automatic equipment and / or the automatic equipment is to be started. According to the utility model, a pure analog circuit is used and no IC is used to realize safety control of equipment, so that failure and damage of the safety control circuit caused by static electricity and other adverse factors are avoided, and damage of an equipment power source to people is avoided.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of safety control technology, and in particular to a safety control circuit and a safety control system. Background Art

[0002] With the development of society, equipment is increasingly replacing manual labor, and semi-automated and automated equipment are increasingly entering factories. This also presents some safety risks for people. For example, when operating equipment, people may open the door cover and come into contact with dangerous sources. Traditional safety control circuits are based on digital chips for logic circuit control. In the presence of factors that damage ICs, such as static electricity, the safety control circuits may fail and be damaged, causing the power source of the equipment to cause harm to people. Utility Model Content

[0003] The utility model provides a safety control circuit and a safety control system, which use pure analog circuits without ICs to achieve safety control of equipment, effectively avoid failure and damage of the safety control circuit caused by adverse factors such as static electricity, and effectively prevent the power source of the equipment from causing harm to people.

[0004] According to one aspect of the present invention, a safety control circuit is provided, the safety control circuit being connected to a semi-automatic device and / or an automated device, the safety control circuit comprising: a door switch, a start button, a reset button, a lock relay, a safety relay, a buzzer, and a three-color light, the three-color light comprising: a red light, a yellow light, and a green light;

[0005] The door switch is connected to the device power source and the reset button, the device power source is connected to the buzzer, the reset button is used to unlock the device power source, and the buzzer is used to issue an alarm when the door switch is actuated or receives an external fault signal;

[0006] The reset button is connected to the locking relay, the safety relay, and the red light. The safety relay is used to cut off the power source of the device. The locking relay is used to lock the power source of the device. The red light is used to illuminate when the door is opened or closed or when an external fault signal is received.

[0007] The reset button is also connected to the green light and the yellow light, the start button is connected to the green light, the start button is used to start the semi-automatic equipment and / or the automated equipment, the green light is used to illuminate when the semi-automatic equipment and / or the automated equipment is working normally, and the yellow light is used to illuminate when the semi-automatic equipment and / or the automated equipment is to be started.

[0008] Optionally, the safety control circuit further includes a first relay and a fourth relay;

[0009] The first relay is connected to the door switch, the reset button, the device power source and the fourth relay. The fourth relay is connected to the buzzer, the red light and the device power source. The first relay and the fourth relay are used to control the buzzer to alarm, and the fourth relay is also used to control the red light to light up.

[0010] Optionally, the safety control circuit further includes a fifth relay and a sixth relay;

[0011] The fifth relay is connected to the start button, the device power source and the green light, the sixth relay is connected between the fifth relay and the yellow light, the fifth relay is used to control the green light to illuminate, and the sixth relay is used to control the yellow light to illuminate.

[0012] Optionally, the safety control circuit further includes a first optical relay, a second optical relay, a third optical relay, and a fourth optical relay;

[0013] A first end of the first optical relay is connected to a power supply, a second end of the first optical relay is connected to the door switch, a third end of the first optical relay is connected to a grating drive signal, and a fourth end of the first optical relay is grounded;

[0014] A first end of the second optical relay is connected to an external trigger dual signal, a second end of the second optical relay is grounded, a third end of the second optical relay is connected to the first end of the reset button, and a fourth end of the second optical relay is connected to the second end of the reset button and the first end of the third optical relay;

[0015] The second end of the third optical relay is grounded, the third end of the third optical relay is connected to the device power source, and the fourth end of the third optical relay is connected to the sixth relay;

[0016] The first end of the fourth photorelay is connected to the external trigger dual signal, the second end of the fourth photorelay is grounded, the third end of the fourth photorelay is connected to the first end of the start button, and the fourth end of the fourth photorelay is connected to the second end of the start button.

[0017] Optionally, the safety control circuit further includes a first current limiting resistor, a second current limiting resistor, a third current limiting resistor and a fourth current limiting resistor;

[0018] The first current limiting resistor is connected to the first end of the second photorelay, the second current limiting resistor is connected to the third end of the first photorelay, the third current limiting resistor is connected to the first end of the third photorelay, and the fourth current limiting resistor is connected to the first end of the fourth photorelay.

[0019] Optionally, the safety control circuit further comprises a second diode and a third diode, the second diode is connected in parallel with the coil of the locking relay, and the third diode is connected in parallel with the coil of the safety relay.

[0020] Optionally, the safety control circuit further comprises a first diode and a fifth diode, the first diode is connected with the coil of the first relay, and the fifth diode is connected with the coil of the fourth relay.

[0021] Optionally, the safety control circuit further comprises a sixth diode and a seventh diode, the sixth diode is connected with the coil of the fifth relay, and the seventh diode is connected with the coil of the sixth relay.

[0022] Optionally, the safety control circuit further comprises a fourth diode, the fourth diode is connected with the second current-limiting resistor.

[0023] According to another aspect of the present application, a safety control system is provided, which comprises the safety control circuit according to any one of the aspects above, and a semi-automated device and / or an automated device.

[0024] The safety control circuit is connected with the semi-automated device and / or the automated device.

[0025] The technical scheme of the present application provides a safety control circuit, which is simple in circuit, conventional in device, and can be locked by a safety relay, indicated by a three-color lamp, and alarmed by a buzzer, thereby avoiding personnel injury caused by device operation and non-operation time contact with the device. The pure analog circuit does not use IC, effectively avoids the damage of safety control circuit caused by static electricity and other adverse factors, and effectively avoids the harm of the power source of the device to people. In summary, the present application solves the problem that the traditional safety control circuit is based on digital chips to control safety, and the safety control circuit may be damaged in the presence of static electricity and other factors that damage IC, resulting in harm to people caused by the power source of the device.

[0026] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 is a structural diagram of a safety control circuit according to the embodiments of the present application;

[0029] Figure 2 is a circuit principle diagram of a safety control circuit according to the embodiments of the present application. DETAILED DESCRIPTION

[0030] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0031] It should be noted that the terms "first", "second", and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Figure 1 is a structural diagram of a safety control circuit according to the embodiments of the present application, reference Figure 1The embodiment of the present invention provides a safety control circuit, which is connected to a semi-automatic device and / or an automated device. The safety control circuit includes: a door switch 10, a start button 20, a reset button 30, a locking relay K2, a safety relay K3, a buzzer 40, and a three-color light. The three-color light includes: a red light, a yellow light, and a green light. The door switch 10 is connected to the device power source +24_IN and the reset button 30. The device power source +24_IN is connected to the buzzer 40. The reset button 30 is used to unlock the device power source +24_IN. The buzzer 40 is used to detect the door switch 10 action and the receipt of an external fault signal. an alarm is sounded; the reset button 30 is connected to the locking relay K2, the safety relay K3 and the red light; the safety relay K3 is used to cut off the power source +24_IN of the equipment; the locking relay K2 is used to lock the power source +24_IN of the equipment; the red light is used to illuminate when the door switch 10 is actuated or receives an external fault signal; the reset button 30 is also connected to the green light and the yellow light; the start button 20 is connected to the green light; the start button 20 is used to start the semi-automatic equipment and / or the automated equipment; the green light is used to illuminate when the semi-automatic equipment and / or the automated equipment is working normally; the yellow light is used to illuminate when the semi-automatic equipment and / or the automated equipment is to be started.

[0033] Specifically, the safety control circuit's primary function is as follows: During initial startup of a semi-automated or automated device, after checking that no problems exist, press reset button 30 to activate the safety control circuit. At this point, the yellow light illuminates, unlocking the device's power source (+24_IN), and the semi-automated or automated device enters a standby state.

[0034] When an external fault occurs, such as a blocked light barrier, an open door, or the emergency stop (normally closed) button being pressed, buzzer 40 sounds an alarm and a red light illuminates. At this point, the safety control circuit disconnects safety relay K3, thereby shutting off the device's power supply +24_IN. Safety relay K3 contains both normally open and normally closed switch contacts, allowing you to select either one to disconnect the device's power supply. This allows for flexible safety control configuration, allowing you to expand the number and location of safety relays based on actual needs, simultaneously shutting off more hazardous sources.

[0035] Restoring Semi-Automated and / or Automated Equipment to Normal Operation: After all hardware faults have been resolved, to restore the semi-automated and / or automated equipment to normal operation, the reset button (self-reset switch) 6 must be pressed. At this point, the locking relay K2, when energized, locks out the power supply to the safety control circuit. After releasing the reset button 30, the safety control circuit remains powered, ensuring continued safety of the semi-automated and / or automated equipment. At this point, the yellow light illuminates, indicating that the semi-automated and / or automated equipment is in a ready-to-start state. The reset button 30 can be used to reset the safety control circuit after a device failure, or it can be used to restore the device from a fault.

[0036] Start operation: When the semi-automatic equipment and / or the automated equipment is in normal state, press the start button 20, the semi-automatic equipment and / or the automated equipment will start, and the safety control circuit will provide a normal state monitoring signal (24V+high level), and the green light will be on.

[0037] When the semi-automatic equipment and / or automated equipment is operating normally, the green light is on. When the semi-automatic equipment and / or automated equipment is in normal standby mode, the yellow light is on. When the semi-automatic equipment and / or automated equipment fails, the red light is on and the buzzer 40 sounds. When the semi-automatic equipment and / or automated equipment is turned on for the first time, the red light is on and the buzzer 40 does not sound.

[0038] The technical solution of the embodiment of the utility model provides a safety control circuit with a simple circuit and relatively conventional devices. Safety can be locked by a safety relay, indicated by a three-color light, and sounded by a buzzer as an alarm, thereby avoiding personal injury caused by personnel operating the equipment and touching the equipment during non-operating time. The use of a pure analog circuit without an IC effectively avoids the failure and damage of the safety control circuit caused by adverse factors such as static electricity, and can effectively prevent the power source of the equipment from causing harm to people. In summary, the utility model solves the problem that traditional safety control circuits are all based on digital chips for logic circuit control safety. When there are factors such as static electricity that damage the IC, the safety control circuit may fail and be damaged, causing the power source of the equipment to cause harm to people.

[0039] Figure 2 This is a circuit diagram of a safety control circuit provided according to an embodiment of the present utility model, referring to Figure 2 Optionally, the safety control circuit also includes a first relay K1 and a fourth relay K4; the first relay K1 is connected to the door switch 10, the reset button 30, the device power source +24_IN and the fourth relay K4, the fourth relay K4 is connected to the buzzer 40, the red light and the device power source +24_IN, the first relay K1 and the fourth relay K4 are used to control the buzzer 40 to alarm, and the fourth relay K4 is also used to control the red light to light up.

[0040] Continue to refer Figure 2 Optionally, the safety control circuit also includes a fifth relay K5 and a sixth relay K6; the fifth relay K5 is connected to the start button 20, the equipment power source +24_IN and the green light, and the sixth relay K6 is connected between the fifth relay K5 and the yellow light. The fifth relay K5 is used to control the green light to light up, and the sixth relay K6 is used to control the yellow light to light up.

[0041] Specifically, reset button 30 can be a self-resetting switch. When pressed, it automatically resets itself, and then locks relay K2, energizing relay K2, safety relay K3, and fourth relay K4. The yellow light illuminates, indicating a standby state, ready for activation. If lock relay K2 is not locked, pressing reset and then releasing reset button 30 will de-energize the safety control circuit, preventing the fault clearing and standby state.

[0042] Continue to refer Figure 2 Optionally, the safety control circuit further includes a first photorelay U1, a second photorelay U2, a third photorelay U3 and a fourth photorelay U4; a first end of the first photorelay U1 is connected to a power supply +24V, a second end of the first photorelay U1 is connected to a door switch 10, a third end of the first photorelay U1 is connected to a grating drive signal, and a fourth end of the first photorelay U1 is grounded; a first end of the second photorelay U2 is connected to an external trigger dual signal, a second end of the second photorelay U2 is grounded, a third end of the second photorelay U2 is connected to a first end of a reset button 30, a fourth end of the second photorelay U2 is connected to a second end of the reset button 30 and a first end of the third photorelay U3; a second end of the third photorelay U3 is grounded, a third end of the third photorelay U3 is connected to a power source of the device, and a fourth end of the third photorelay U3 is connected to a sixth relay K6;

[0043] The first end of the fourth photorelay U4 is connected to the external trigger dual signal, the second end of the fourth photorelay U4 is grounded, the third end of the fourth photorelay U4 is connected to the first end of the start button 20, and the fourth end of the fourth photorelay U4 is connected to the second end of the start button 20.

[0044] Specifically, the external dual trigger signals originate from a semi-automated and / or automated device. The semi-automated and / or automated device has a component capable of providing dual signals (high level), such as a two-handed button. One of the dual external trigger signals has the same function as the reset button 30, and the other has the same function as the start button 20. The corresponding buttons must be pressed simultaneously when the signals are triggered, and only when there are no external faults can the semi-automated and / or automated device operate.

[0045] The first optical relay U1, the second optical relay U2, the third optical relay U3 and the fourth optical relay U4 can be used for circuit protection, such as preventing power reverse connection, overvoltage protection, etc. The response time of the optical relay is extremely fast, which can reach nanosecond level, much higher than that of the traditional relay. The optical relay uses optical signal transmission and has strong anti-electromagnetic interference ability. The safety control of the equipment is achieved by using the hard control of the optical relay and the mechanical relay.

[0046] With reference to Figure 2 Optionally, the safety control circuit further comprises a first current limiting resistor R1, a second current limiting resistor R2, a third current limiting resistor R3 and a fourth current limiting resistor R4; the first current limiting resistor R1 is connected with the first end of the second optical relay U2, the second current limiting resistor R2 is connected with the third end of the first optical relay U1, the third current limiting resistor R3 is connected with the first end of the third optical relay U3, and the fourth current limiting resistor R4 is connected with the first end of the fourth optical relay U4.

[0047] Specifically, the first current limiting resistor R1, the second current limiting resistor R2, the third current limiting resistor R3 and the fourth current limiting resistor R4 are current limiting resistors of the second optical relay U2, the first optical relay U1, the third optical relay U3 and the fourth optical relay U4 respectively. By setting a certain size of the current limiting resistor, the change rate of the current can be limited, and the protection of the line and the optical relay can be achieved.

[0048] With reference to Figure 2 Optionally, the safety control circuit further comprises a second diode D2 and a third diode D3, the second diode D2 is connected in parallel with the coil of the locking relay K2, and the third diode D3 is connected in parallel with the coil of the safety relay K3.

[0049] With reference to Figure 2 Optionally, the safety control circuit further comprises a first diode D1 and a fifth diode D5, the first diode D1 is connected with the coil of the first relay K1, and the fifth diode D5 is connected with the coil of the fourth relay K4.

[0050] With reference to Figure 2 Optionally, the safety control circuit further comprises a sixth diode D6 and a seventh diode D7, the sixth diode D6 is connected with the coil of the fifth relay K5, and the seventh diode D7 is connected with the coil of the sixth relay K6.

[0051] Specifically, the second diode D2, the third diode D3, the first diode D1, the fifth diode D5, the sixth diode D6, and the seventh diode D7 are all freewheeling diodes. When the relay is energized, current flows through the relay coil. If this current is suddenly cut off, the relay coil, acting as an inductive element, attempts to maintain this current. However, due to the sudden change in current, a high back electromotive force may be generated across the relay coil, potentially damaging other components in the circuit. To avoid this, a freewheeling diode is typically connected in parallel across the relay coil. When the coil is de-energized, the freewheeling diode provides a circuit for the relay coil, allowing the current in the relay coil to gradually decrease to zero rather than being abruptly interrupted. This prevents the generation of high voltage and protects other components in the circuit from damage. Therefore, the freewheeling diode is added to protect the circuit and ensure the safe and reliable operation of the relay.

[0052] Continue to refer Figure 2 Optionally, the safety control circuit further includes a fourth diode D4, which is connected to the second current limiting resistor R2.

[0053] Specifically, the fourth diode D4 has a signal isolation function to prevent the input grating driving signal from being affected by other circuits.

[0054] An embodiment of the present invention further provides a safety control system, which includes the safety control circuit provided in any embodiment of the present invention and a semi-automatic device and / or an automated device; the safety control circuit is connected to the semi-automatic device and / or the automated device.

[0055] Since the safety control system includes the safety control circuit provided by any embodiment of the present invention, the beneficial effects of the above-mentioned safety control system and the safety control circuit are the same and will not be described in detail here.

[0056] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A safety control circuit connected to a semi-automatic device and / or an automated device, characterized in that: include: Door switch, start button, reset button, lock relay, safety relay, buzzer and three-color lights, the three-color lights include: red light, yellow light and green light; The door switch is connected to the device power source and the reset button, the device power source is connected to the buzzer, the reset button is used to unlock the device power source, and the buzzer is used to issue an alarm when the door switch is actuated or receives an external fault signal; The reset button is connected to the locking relay, the safety relay, and the red light. The safety relay is used to cut off the power source of the device. The locking relay is used to lock the power source of the device. The red light is used to illuminate when the door is opened or closed or when an external fault signal is received. The reset button is also connected to the green light and the yellow light, the start button is connected to the green light, the start button is used to start the semi-automatic equipment and / or the automated equipment, the green light is used to illuminate when the semi-automatic equipment and / or the automated equipment is working normally, and the yellow light is used to illuminate when the semi-automatic equipment and / or the automated equipment is to be started.

2. The safety control circuit according to claim 1, characterized in that: Also included are a first relay and a fourth relay; The first relay is connected to the door switch, the reset button, the device power source and the fourth relay. The fourth relay is connected to the buzzer, the red light and the device power source. The first relay and the fourth relay are used to control the buzzer to alarm, and the fourth relay is also used to control the red light to light up.

3. The safety control circuit according to claim 1, characterized in that: Also included are a fifth relay and a sixth relay; The fifth relay is connected to the start button, the device power source and the green light, the sixth relay is connected between the fifth relay and the yellow light, the fifth relay is used to control the green light to illuminate, and the sixth relay is used to control the yellow light to illuminate.

4. The safety control circuit according to claim 3, characterized in that: Also includes a first optical relay, a second optical relay, a third optical relay and a fourth optical relay; A first end of the first optical relay is connected to a power supply, a second end of the first optical relay is connected to the door switch, a third end of the first optical relay is connected to a grating drive signal, and a fourth end of the first optical relay is grounded; A first end of the second optical relay is connected to an external trigger dual signal, a second end of the second optical relay is grounded, a third end of the second optical relay is connected to the first end of the reset button, and a fourth end of the second optical relay is connected to the second end of the reset button and the first end of the third optical relay; The second end of the third optical relay is grounded, the third end of the third optical relay is connected to the device power source, and the fourth end of the third optical relay is connected to the sixth relay; The first end of the fourth photorelay is connected to the external trigger dual signal, the second end of the fourth photorelay is grounded, the third end of the fourth photorelay is connected to the first end of the start button, and the fourth end of the fourth photorelay is connected to the second end of the start button.

5. The safety control circuit according to claim 4, characterized in that: Also includes a first current limiting resistor, a second current limiting resistor, a third current limiting resistor and a fourth current limiting resistor; The first current limiting resistor is connected to the first end of the second photorelay, the second current limiting resistor is connected to the third end of the first photorelay, the third current limiting resistor is connected to the first end of the third photorelay, and the fourth current limiting resistor is connected to the first end of the fourth photorelay.

6. The safety control circuit according to claim 1, characterized in that: The device further includes a second diode and a third diode, wherein the second diode is connected in parallel with the coil of the locking relay, and the third diode is connected in parallel with the coil of the safety relay.

7. The safety control circuit according to claim 2, characterized in that: The device further includes a first diode and a fifth diode, wherein the first diode is connected to the coil of the first relay, and the fifth diode is connected to the coil of the fourth relay.

8. The safety control circuit according to claim 3, characterized in that: The device further includes a sixth diode and a seventh diode. The sixth diode is connected to the coil of the fifth relay, and the seventh diode is connected to the coil of the sixth relay.

9. The safety control circuit according to claim 5, characterized in that: A fourth diode is also included, and the fourth diode is connected to the second current limiting resistor.

10. A safety control system, characterized in that: The safety control circuit and semi-automatic equipment and / or automated equipment according to any one of claims 1 to 9; The safety control circuit is connected to the semi-automatic device and / or the automated device.

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