An explosion-proof cabinet electric control system for a spraying robot and a control method thereof

Abstract

The present invention relates to the field of safety technology of spraying robots, and specifically to an explosion-proof cabinet electric control system of a spraying robot and a control method thereof, comprising an explosion-proof cabinet, a main power module, an electric control module, a button module, and a pneumatic element module, wherein the control method comprises the following steps: S1; starting a robot control cabinet; supplying 220V alternating current to the explosion-proof cabinet through an explosion-proof aviation plug cable; S2; a switch indicator light is on; S3; pressing a start button indicator light, the explosion-proof cabinet starts working, and a blue indicator light is on; S4; the purge work starts; S5; observing the flow rate; S6; transmitting a purge signal; S7; when the safety timing cleaning work of the explosion-proof system is completed, a safety PLC will send a feedback signal; S8; preparing for explosion-proof function; S9; powering on the control cabinet; by adopting a safety PLC in cooperation with safety relays and explosion-proof isolation fence components, relevant feedback signals and corresponding control instructions are received and sent more stably and safely, thereby improving the overall stability, anti-interference and safety of the explosion-proof cabinet electric control system.

Description

Technical Field

[0001] The present invention relates to the technical field of spraying robot safety, and in particular to an explosion-proof cabinet electric control system of a spraying robot and a control method thereof. Background Art

[0002] With the advent of the Industrial 4.0 era and the rapid development of the national economy, it is a general trend for various industries to adopt automated production and manufacturing to replace manual operations. Various industrial robots have emerged and are widely used. As an important member of industrial robots, spraying robots have been widely used in various domestic industries in recent years, such as home furnishings, building materials, automotive ceramics and other industries. However, due to the special work content and harsh environment of spraying robots, if the relevant safety protection design is not in place, there will be very large safety hazards, which may easily cause production accidents.

[0003] The existing spraying robots in China either have no explosion-proof system or the explosion-proof electric control system is relatively simple. Generally, the robot main controller is used in conjunction with relays and solenoid valves to achieve relevant explosion-proof functions. This method has a low safety factor, low versatility, poor environmental adaptability, and a short service life. Most of them cannot pass relevant explosion-proof certifications at home and abroad. As people pay more and more attention to safe production, the research and development and design of explosion-proof spraying robots have become a hot issue. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes an electric control system of an explosion-proof cabinet of a spraying robot and a control method thereof.

[0005] An explosion-proof cabinet electric control system for a spraying robot, comprising an explosion-proof cabinet connected to the robot, wherein the explosion-proof cabinet is provided with:

[0006] The main power module is connected to the explosion-proof cabinet to provide power for the components in the explosion-proof cabinet;

[0007] The power control module is installed in the explosion-proof cabinet to control the working state of the components in the explosion-proof cabinet and the on-off of the circuit;

[0008] A button module is arranged on the inner and outer surfaces of the explosion-proof cabinet to display the working status of the explosion-proof cabinet;

[0009] The pneumatic component module is installed in the robot body to monitor the state and content of the air entering and exiting the robot body and provide real-time feedback to the control module for control and adjustment.

[0010] The main power module includes a switching power supply for rectifying 220V AC power into 24V DC power, and a fuse for preventing damage to related components caused by overload of supply current.

[0011] The electrical control module includes a safety PLC for receiving and processing feedback signals from relevant components in the explosion-proof cabinet and issuing corresponding control instructions or signals, an explosion-proof isolation fence for converting the explosion-proof system cleaning completion signal fed back by the flow meter into a safety signal and transmitting it to the safety PLC, and a safety relay cooperating with the safety PLC.

[0012] The main power module and the power control module both include a switch knob for controlling the on and off of the explosion-proof cabinet electrical control system and wiring terminals for transmitting signals or 24V electricity. The fuses of the main power module are FU1 and FU2, and the fuse of the power control module is FU3; the wiring terminals of the main power module are X1-X3, and the wiring terminals of the power control module are X4-X8. The functions of the safety PLC need to be realized with the cooperation of safety relays, explosion-proof isolation fences, and wiring terminals X4-X8 components.

[0013] The button module includes a switch indicator light, a start button indicator light, a constant pressure indicator light, and a fault indicator light for displaying the working status of the explosion-proof cabinet and providing real-time feedback of corresponding information to the operator for easy inspection and maintenance.

[0014] The pneumatic component module includes a digital pressure gauge for real-time monitoring and displaying the air pressure in the robot cavity and feeding back relevant data information to the safety PLC, an explosion-proof solenoid valve and a pressure regulating valve for controlling the inlet and outlet air content in the robot body, and a flow meter installed in the robot body for the explosion-proof system to detect the air intake volume when cleaning the robot cavity and feed back relevant information to the explosion-proof isolation fence.

[0015] A control method for an explosion-proof cabinet electric control system of a spraying robot, the specific steps of which are as follows:

[0016] S1: Start the robot control cabinet: supply 220V AC power to the explosion-proof cabinet through the explosion-proof aviation plug cable;

[0017] S2: The switch indicator light is on: Turn on the explosion-proof cabinet knob switch to power on the explosion-proof cabinet. If there is no wiring problem or other faults, the green switch indicator light on the outer panel of the explosion-proof cabinet will light up;

[0018] S3: Press the start button indicator light, the explosion-proof cabinet starts working, and the blue indicator light comes on;

[0019] S4: Purge work starts: The safety PLC controls the explosion-proof system to enter the purge working state, and the two flow meters installed in the robot body start real-time monitoring. At the same time, the explosion-proof solenoid valves in the explosion-proof cabinet and the robot body are opened;

[0020] S5: Observe the flow rate: Observe the flow rate and pressure values ​​of the air inlet and outlet in the robot cavity fed back by the two digital pressure gauges in the explosion-proof cabinet. The pressure regulating valve in the explosion-proof cabinet can be manually adjusted to control the air intake according to the feedback values ​​of the digital pressure gauges.

[0021] S6: Transmit purge signal: The explosion-proof isolation fence will convert the purge completion signal fed back by the flow meter into a safe signal and transmit it to the safety PLC:

[0022] a: After receiving the relevant signal, the safety PLC will control the explosion-proof system to enter the safety timing cleaning working state after processing. At this time, the start button indicator light flashes blue;

[0023] b: If the safety PLC does not receive the purge completion signal fed back by the explosion-proof isolation fence for a long time before this, an alarm will be issued and the fault indicator will light up. At this time, the explosion-proof system needs to be repaired to eliminate the fault;

[0024] S7: When the explosion-proof system safety timing cleaning work is completed, the safety PLC will send a feedback signal;

[0025] S8: Preparation for explosion-proof function: The blue light of the start button indicator stops flashing, the white constant pressure indicator lights up, and the explosion-proof solenoid valves in the explosion-proof cabinet and the robot body are closed at the same time. At this time, the air intake and air outlet in the robot cavity reach a balance, and the explosion-proof function is ready;

[0026] S9: Power on in the control cabinet: The safety PLC will also feed back the explosion-proof function completion signal to the safety relay to control it to enter the working state.

[0027] The two sets of flow meters in step S4 are used for injecting clean gas, and the explosion-proof solenoid valve is used for releasing the original unsafe gas in the robot cavity.

[0028] When the air intake and air outlet volumes in the robot cavity in step S5 remain basically consistent and reach the monitoring threshold set by the flow meter, the monitoring threshold set by the flow meter is related to the selected product model. At this time, the flow meter will feedback a signal to the explosion-proof isolation fence indicating that the purge work has been completed and the flow meter stops monitoring.

[0029] The safety relay in step S9 transmits the explosion-proof function completion signal to the contactor in the robot control cabinet through the X4 terminal block and the explosion-proof aviation plug cable in the cabinet, so as to control the 24V power in the circuit of the cabinet. At this point, the relevant operator can control the robot to start spraying; on the contrary, if the safety PLC monitoring explosion-proof system fails to complete the safety timing cleaning work, an alarm signal will be issued and the fault indicator light will light up. At this time, the explosion-proof system needs to be inspected and repaired to eliminate the fault.

[0030] The beneficial effects of the present invention are as follows: by adopting a safety PLC in cooperation with safety relays and explosion-proof isolation fence components, relevant feedback signals and corresponding control instructions are received and sent more stably and safely, thereby improving the overall stability, anti-interference and safety of the explosion-proof cabinet electronic control system, complying with relevant explosion-proof design standards for spray robots at home and abroad, having a simple structure and operation, strong versatility and anti-interference ability, high safety factor and work efficiency, relatively low cost and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] Figure 1 It is a schematic block diagram of the system structure of the present invention;

[0033] Figure 2 is a component layout diagram of the present invention;

[0034] Figure 3 It is the main circuit diagram of the electric control system of the present invention;

[0035] Figure 4 It is the circuit diagram of the safety relay and explosion-proof isolation fence of the present invention;

[0036] Figure 5 It is the safety PLC circuit diagram of the present invention;

[0037] Figure 6 It is the system control and workflow diagram of the present invention.

[0038] The symbols in the accompanying drawings are:

[0039] 1. Switching power supply; 2. Fuse FU1; 3. Fuse FU2; 4. Terminal block X1; 5. Terminal block X2; 6. Terminal block X3; 7. Switch knob; 8. Safety PLC; 9. Safety relay; 10. Explosion-proof isolation fence; 11. Fuse FU3; 12. Terminal block X4; 13. Terminal block X5; 14. Terminal block X6; 15. Terminal block X7; 16. Terminal block X8; 17. Switch indicator light; 18. Start button indicator light; 19. Constant pressure indicator light; 20. Fault indicator light; 21. Digital pressure gauge; 22. Explosion-proof solenoid valve; 23. Pressure regulating valve; 24. Flow meter. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below.

[0041] like Figure 1 and Figure 2As shown, an explosion-proof cabinet electric control system for a spraying robot includes an explosion-proof cabinet connected to the robot, wherein the explosion-proof cabinet is provided with:

[0042] The main power module is connected to the explosion-proof cabinet to provide power for the components in the explosion-proof cabinet;

[0043] The power control module is installed in the explosion-proof cabinet to control the working state of the components in the explosion-proof cabinet and the on-off of the circuit;

[0044] A button module is arranged on the inner and outer surfaces of the explosion-proof cabinet to display the working status of the explosion-proof cabinet;

[0045] The pneumatic component module is installed in the robot body to monitor the state and content of the air entering and exiting the robot body and provide real-time feedback to the control module for control and adjustment.

[0046] The main power module includes a switching power supply 1 for rectifying 220V AC power into 24V DC power, and a fuse for preventing damage to related components caused by overload of supply current.

[0047] The fuse plays a role in protecting the circuit.

[0048] like Figure 3 As shown, when the robot control cabinet is started, 220V AC power is provided to the explosion-proof cabinet through the explosion-proof aviation plug cable; when the explosion-proof cabinet switch knob 7 is turned on, the explosion-proof cabinet electric control system is turned on, and the AC power passes through the terminal X1, first passes through the fuse FU1 to prevent the supply current from overload to ensure the safety of the components and circuits in the cabinet, and then passes through the switching power supply 1 to rectify the 220V AC power into 24V DC power, and powers the relevant components in the explosion-proof cabinet through the fuse FU2 and the terminals X2 and X3. Since the relevant load in the explosion-proof cabinet is small, the power of the switching power supply 1 does not need to be too large, 500W is enough.

[0049] like Figure 4-Figure 6As shown, pins 1-4 of the explosion-proof isolation fence 10 are connected to two flow meters 24 installed in the robot cavity through explosion-proof aviation plug cables and related wiring terminals in the robot control cabinet; when the explosion-proof system purge work is completed, the explosion-proof isolation fence 10 will convert the purge completion signal fed back by the flow meter 24 into a safe signal and transmit it to pins I9 and I8 of the safety PLC8 through pins 5 and 7. After receiving the relevant signal, the safety PLC8 will control the explosion-proof system to enter the safe timing cleaning working state after processing. The specific cleaning time setting needs to be formulated according to factors such as the robot cavity volume, working environment, domestic and international explosion-proof standards, etc. Pin A1 of safety relay 9 is connected to pin O0 of safety PLC8, which transmits the explosion-proof system safety timing cleaning work completion signal fed back by safety PLC8, and controls the on-off of safety relay 9 circuit; pins 13 and 14 of safety relay 9 are connected to terminal X4 in the explosion-proof cabinet, and the explosion-proof function completion signal is fed back to the contactor in the robot control cabinet through the explosion-proof aviation plug cable, so as to facilitate the 24V power supply to the circuit in the control cabinet; pins 23 and 24 of safety relay 9 are connected to terminal X5 in the explosion-proof cabinet, which is a reserved set of safety signals and can be used to connect peripheral spraying equipment; pin 32 of safety relay 9 is connected to pin IM2 of safety PLC8, which is mainly to feed back the working status of safety relay 9 to safety PLC8.

[0050] The electrical control module includes a safety PLC8 for receiving and processing feedback signals from relevant components in the explosion-proof cabinet and issuing corresponding control instructions or signals, an explosion-proof isolation fence 10 for converting the explosion-proof system cleaning completion signal fed back by the flow meter 24 into a safety signal and transmitting it to the safety PLC8, and a safety relay 9 cooperating with the safety PLC8.

[0051] By adopting the safety PLC8 in cooperation with the safety relay 9 and the explosion-proof isolation fence 10 components, the relevant feedback signals and corresponding control instructions are received and sent more stably and safely, thereby improving the overall stability, anti-interference and safety of the explosion-proof cabinet electronic control system. It complies with the relevant explosion-proof design standards for spray robots at home and abroad, has a simple structure and operation, strong versatility and anti-interference ability, high safety factor and work efficiency, relatively low cost and long service life.

[0052] like Figure 5 As shown, the 24V pin of the safety PLC8 is connected to the fuse FU3 to prevent the current supplied to the safety PLC8 from overloading, protect the device safety, and improve the safety factor of the explosion-proof electric control system. The IM0 and T0 pins of the safety PLC8 are connected to the normally open port 3 and port 1 of the start button indicator light 18. When the start button indicator light 18 is pressed, the safety PLC8 receives the feedback signal, and after processing, it issues a control command, and the explosion-proof system enters the purge working state, and the blue indicator light is on.

[0053] The I4-I7 pins of the safety PLC8 are connected to the wiring terminals X7 and X8 in the explosion-proof cabinet respectively. The two digital pressure gauges 21 feed back the real-time monitored data information about the air pressure in the robot cavity to the safety PLC8 through the wiring terminals X7 and X8, so that the safety PLC8 can adjust the explosion-proof solenoid valve 22 in the explosion-proof cabinet and the robot body in real time to control the air pressure value in the robot cavity within a safe range to prevent production accidents. The T1 and T2 pins of the safety PLC8 are connected to the port 1 of the constant pressure indicator 19 and the fault indicator 20 respectively. When the safety timing cleaning work of the explosion-proof system controlled by the safety PLC8 is completed, the blue light of the start button indicator 18 stops flashing, and the safety PLC8 will send a feedback signal. At this time, the white constant pressure indicator 19 lights up, indicating that the explosion-proof function is ready. During the operation of the explosion-proof cabinet's electrical control system, the safety PLC8 will monitor in real time whether the entire electrical control system has any faults. If a fault occurs, the safety PLC8 will immediately issue a command to stop the electrical control system, and the fault indicator light 20 will light up, otherwise it will not light up; the O1 and O2 pins of the safety PLC8 are respectively connected to the X4 and X6 terminals in the explosion-proof cabinet. The former controls the on-off of the explosion-proof solenoid valve 22 in the cabinet through the X4 terminal when the explosion-proof system is in the purging and cleaning working state; the latter controls the on-off of the explosion-proof solenoid valve 22 in the robot body through the X6 terminal and with the help of an explosion-proof aviation plug cable when the explosion-proof system is in the purging and cleaning working state.

[0054] The safety PLC8, digital pressure gauge 21 and flow meter 24 related circuits in the explosion-proof cabinet electronic control system all adopt a dual-loop redundant design to prevent the electronic control system from having a signal feedback or detection failure during operation that affects the system operation, making the electronic control system have better scientific performance and strong adaptability to the environment.

[0055] The explosion-proof isolation fence 10 improves the stability, anti-interference and safety of signal transmission between components of the explosion-proof cabinet electric control system, and complies with relevant explosion-proof design standards for spray robots at home and abroad.

[0056] like Figure 2As shown, the main power module and the control power module both include a switch knob 7 for controlling the on and off of the explosion-proof cabinet electric control system, and a wiring terminal for transmitting signals or 24V electricity. The fuses of the main power module are FU1 and FU2, and the reference numerals in the figure are 2 and 3 respectively; the fuse of the control power module is FU3, and the reference numeral in the figure is 11; the wiring terminals of the main power module are X1-X3, and the reference numerals in the figure are 4, 5 and 6 respectively; the wiring terminals of the control power module are X4-X8, and the reference numerals in the figure are 12, 13, 14, 15 and 16 respectively. The function of the safety PLC 8 needs to be realized with the cooperation of the safety relay 9, the explosion-proof isolation fence 10 and the wiring terminals X4-X8 components.

[0057] The button module includes a switch indicator light 17, a start button indicator light 18, a constant pressure indicator light 19, and a fault indicator light 20 for displaying the working status of the explosion-proof cabinet and providing real-time feedback of corresponding information to the operator for easy inspection and maintenance.

[0058] The pneumatic component module includes a digital pressure gauge 21 for real-time monitoring and displaying the air pressure in the robot cavity and feeding back relevant data information to the safety PLC8, an explosion-proof solenoid valve 22 and a pressure regulating valve 23 for controlling the inlet and outlet air content in the robot body, and a flow meter 24 installed in the robot body for the explosion-proof system to detect the air intake volume when cleaning the robot cavity and feed back relevant information to the explosion-proof isolation fence 10.

[0059] A control method for an explosion-proof cabinet electric control system of a spraying robot, the specific steps of which are as follows:

[0060] S1: Start the robot control cabinet: supply 220V AC power to the explosion-proof cabinet through the explosion-proof aviation plug cable;

[0061] S2: Switch indicator light 17 is on: Turn on the explosion-proof cabinet knob switch to power on the explosion-proof cabinet. If there is no wiring problem or other faults, the green switch indicator light 17 on the outer panel of the explosion-proof cabinet will light up;

[0062] S3: Press the start button indicator light 18, the explosion-proof cabinet starts working, and the blue indicator light lights up;

[0063] S4: Purge work starts: the safety PLC8 controls the explosion-proof system to enter the purge working state, and the two flow meters 24 installed in the robot body start real-time monitoring work, and at the same time, the explosion-proof solenoid valves 22 in the explosion-proof cabinet and the robot body are opened;

[0064] S5: Observe the flow rate: observe the flow rate and pressure values ​​of the air inlet and outlet in the robot cavity fed back by the two digital pressure gauges 21 in the explosion-proof cabinet, and manually adjust the pressure regulating valve 23 in the explosion-proof cabinet to control the air intake according to the feedback values ​​of the digital pressure gauges 21;

[0065] S6: Transmitting the purge signal: The explosion-proof isolation fence 10 will convert the purge completion signal fed back by the flow meter 24 into a safe signal and transmit it to the safety PLC8:

[0066] a: After receiving the relevant signal, the safety PLC8 will control the explosion-proof system to enter the safety timing cleaning working state. At this time, the start button indicator light 18 flashes blue;

[0067] b: Before this, if the safety PLC8 has not received the purge completion signal fed back by the explosion-proof isolation fence 10 for a long time, an alarm will be issued and the fault indicator light 20 will light up. At this time, the explosion-proof system needs to be repaired to eliminate the fault;

[0068] S7: When the explosion-proof system safety timing cleaning work is completed, the safety PLC8 will send a feedback signal;

[0069] S8: Preparation for explosion-proof function: The blue light of the start button indicator light 18 stops flashing, the white constant pressure indicator light 19 lights up, and the explosion-proof solenoid valves 22 in the explosion-proof cabinet and the robot body are closed at the same time. At this time, the air intake and air outlet in the robot cavity reach a balance, and the explosion-proof function is ready;

[0070] S9: Power on in the control cabinet: Safety PLC8 will also feed back the explosion-proof function completion signal to safety relay 9 to control it to enter the working state.

[0071] The two groups of flow meters 24 in step S4 are used for injecting clean gas, and the explosion-proof solenoid valve 22 is used for releasing the original unsafe gas in the robot cavity.

[0072] When the air intake and air outlet volumes in the robot cavity in step S5 remain basically consistent and reach the monitoring threshold set by the flow meter 24, the monitoring threshold set by the flow meter 24 is related to the selected product model. At this time, the flow meter 24 will feedback a signal to the explosion-proof isolation fence 10 indicating that the purge work has been completed and the flow meter 24 stops monitoring.

[0073] The safety relay 9 in the step S9 transmits the explosion-proof function completion signal to the contactor in the robot control cabinet through the cabinet terminal X4 and the explosion-proof aviation plug cable, so as to control the 24V power in the circuit of the cabinet. At this point, the relevant operator can control the robot to start spraying; on the contrary, if the safety PLC8 monitors that the explosion-proof system has not completed the safety timing cleaning work, it will send out an alarm signal and the fault indicator light 20 will light up. At this time, the explosion-proof system needs to be inspected and repaired to eliminate the fault.

[0074] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A control method for the electric control system of an explosion-proof cabinet of a spraying robot, wherein: An explosion-proof cabinet electric control system for a spraying robot includes an explosion-proof cabinet connected to the robot, wherein the explosion-proof cabinet is provided with: The main power module is connected to the explosion-proof cabinet to provide power for the components in the explosion-proof cabinet; The power control module is installed in the explosion-proof cabinet to control the working state of the components in the explosion-proof cabinet and the on-off of the circuit; A button module is arranged on the inner and outer surfaces of the explosion-proof cabinet to display the working status of the explosion-proof cabinet; The pneumatic component module is installed in the robot body to monitor the state and content of the air in and out of the robot body and provide real-time feedback to the control module for control and adjustment; The electric control module comprises a safety PLC (8) for receiving and processing feedback signals from relevant components in the explosion-proof cabinet and issuing corresponding control instructions or signals, an explosion-proof isolation fence (10) for converting the explosion-proof system cleaning completion signal fed back by the flow meter (24) into a safety signal and transmitting it to the safety PLC (8), and a safety relay (9) cooperating with the safety PLC (8); The button module comprises a switch indicator light (17), a start button indicator light (18), a constant pressure indicator light (19), and a fault indicator light (20) for displaying the working status of the explosion-proof cabinet and providing real-time feedback of corresponding information to the operator for easy inspection and maintenance; The pneumatic component module includes a digital pressure gauge (21) for real-time monitoring and displaying the air pressure in the robot cavity and feeding back relevant data information to the safety PLC (8), an explosion-proof solenoid valve (22) and a pressure regulating valve (23) for controlling the air content in and out of the robot body, and a flow meter (24) installed in the robot body for detecting the air intake volume when the explosion-proof system cleans the robot cavity and feeding back relevant information to the explosion-proof isolation fence (10). The characteristic is that the specific steps of the control method are as follows: S1: Start the robot control cabinet: supply 220V AC power to the explosion-proof cabinet through the explosion-proof aviation plug cable; S2: The switch indicator light (17) is on: Turn on the explosion-proof cabinet knob switch to power on the explosion-proof cabinet. If there is no wiring problem or other faults, the green switch indicator light (17) on the outer panel of the explosion-proof cabinet will light up; S3: Press the start button indicator light (18), the explosion-proof cabinet starts working, and the blue indicator light comes on; S4: Purge operation starts: the safety PLC (8) controls the explosion-proof system to enter the purge operation state, and the two flow meters (24) installed in the robot body start real-time monitoring. At the same time, the explosion-proof solenoid valves (22) in the explosion-proof cabinet and the robot body are opened; S5: Observe the flow rate: observe the flow rate and pressure values ​​of the air inlet and outlet in the robot cavity fed back by the two digital pressure gauges (21) in the explosion-proof cabinet, and manually adjust the pressure regulating valve (23) in the explosion-proof cabinet to control the air intake according to the feedback values ​​of the digital pressure gauges (21); S6: Transmitting the purge signal: The explosion-proof isolation fence (10) converts the purge completion signal fed back by the flow meter (24) into a safe signal and transmits it to the safety PLC (8): a: After receiving the relevant signal, the safety PLC (8) will process it and control the explosion-proof system to enter the safety timed cleaning working state. At this time, the start button indicator (18) flashes blue; b: If the safety PLC (8) does not receive the purge completion signal fed back by the explosion-proof isolation fence (10) for a long time, an alarm will be issued and the fault indicator light (20) will light up. At this time, the explosion-proof system needs to be repaired to eliminate the fault; S7: When the explosion-proof system safety timing cleaning work is completed, the safety PLC (8) will send a feedback signal; S8: Preparation for explosion-proof function: The blue light of the start button indicator (18) stops flashing, the white constant pressure indicator (19) lights up, and the explosion-proof solenoid valves (22) in the explosion-proof cabinet and the robot body are closed at the same time. At this time, the air intake and air outlet in the robot cavity reach a balance, and the explosion-proof function is ready; S9: Power is turned on in the control cabinet: the safety PLC (8) will also feed back the explosion-proof function completion signal to the safety relay (9), controlling it to enter the working state.

2. The control method of the electric control system of the explosion-proof cabinet of a spraying robot according to claim 1 is characterized in that: The main power module comprises a switching power supply (1) for rectifying 220V alternating current into 24V direct current, and a fuse for preventing damage to related components caused by overload of supply current.

3. The control method of the electric control system of the explosion-proof cabinet of a spraying robot according to claim 1 is characterized in that: The main power module and the control power module both include a switch knob (7) for controlling the on and off of the explosion-proof cabinet electric control system, and a wiring terminal for transmitting signals or 24V electricity. The fuses of the main power module are FU1 and FU2, and the fuse of the control power module is FU3. The wiring terminals of the main power module are X1-X3, and the wiring terminals of the control power module are X4-X8. The function of the safety PLC (8) needs to be realized with the cooperation of the safety relay (9), the explosion-proof isolation fence (10), and the wiring terminals X4-X8.

4. The control method of the electric control system of the explosion-proof cabinet of a spraying robot according to claim 1 is characterized in that: The two sets of flow meters (24) in step S4 are used for injecting clean gas, and the explosion-proof solenoid valve (22) is used for releasing the original unsafe gas in the robot cavity.

5. The control method of the electric control system of the explosion-proof cabinet of a spraying robot according to claim 1 is characterized in that: When the air intake and air outlet volumes in the robot cavity in step S5 are substantially consistent and reach a monitoring threshold value set by the flow meter (24), the monitoring threshold value set by the flow meter (24) is related to the selected product model. At this time, the flow meter (24) will feed back a signal to the explosion-proof isolation fence (10) indicating that the purging work has been completed and the flow meter (24) stops monitoring.

6. The control method of the electric control system of the explosion-proof cabinet of a spraying robot according to claim 1, characterized in that: The safety relay (9) in step S9 transmits the explosion-proof function completion signal to the contactor in the robot control cabinet through the X4 terminal block and the explosion-proof aviation plug cable in the cabinet, so as to control the 24V power in the circuit of the cabinet. At this point, the relevant operator can control the robot to start spraying; on the contrary, if the safety PLC (8) monitors that the explosion-proof system has not completed the safety timed cleaning work, an alarm signal will be issued and the fault indicator light (20) will light up. At this time, the explosion-proof system needs to be repaired to eliminate the fault.

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