An automated online hanger paint stripping system

Abstract

The application discloses an automatic online hanger paint stripping system, comprising a control module, characterized in that the control module comprises a first resistor, a second resistor, a first triode, a second light-emitting diode, a third light-emitting diode, a first probe, a second probe, a third probe, a fourth probe, a first relay, a first capacitor, a first output end and a second output end; the first probe and the third probe are connected with a power supply; the second probe is connected with one end of the first resistor, one end of the second resistor and one end of the first capacitor; the other end of the first resistor and the other end of the first capacitor are connected with a grounding end; and the other end of the second resistor is connected with a base of the first triode. The application solves the problem that when the paint stripping tank is about to reach a paint stripping liquid supplement interval, the liquid level fluctuates due to the frequent entry and exit of the hanger into the paint stripping tank, and the water pump is frequently started.

Description

Technical Field

[0001] This invention relates to the field of paint stripping technology for metal surfaces, and in particular to an automated online paint stripping system for hangers. Background Technology

[0002] The purpose of the mounting rack is to first install the parts to be coated into the rack, and then connect the rack to the electrodes to conduct electricity during spraying, so that the current is transmitted to the parts more evenly for electroplating. Publication number: CN212943676U discloses an online paint stripping system for spraying racks. It realizes automatic replenishment of paint stripping solution by setting a liquid level sensor in the paint stripping module. However, when the paint stripping tank is about to reach the paint stripping solution replenishment zone, the frequent entry and exit of the rack into the paint stripping tank causes the liquid level to fluctuate. When the peak amplitude of the fluctuation is higher than the liquid level replenishment point and the trough amplitude is lower than the liquid level replenishment point, the water pump start signal will be frequently sent. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this invention is to provide an automated online paint stripping system for hangers, comprising a control module. The control module includes a first resistor R1, a second resistor R2, a first transistor D1, a second light-emitting diode D2, a third light-emitting diode D3, a first probe IN1, a second probe IN2, a third probe IN3, a fourth probe IN4, a first relay K1, a first capacitor C1, a first output terminal OUT1, and a second output terminal OUT2. The first probe IN1 and the third probe IN3 are connected to a power supply. The second probe IN2 is connected to one end of the first resistor R1, one end of the second resistor R2, and one end of the first capacitor C1. The other end of the first resistor R1... The first capacitor C1 is connected to the other end and the ground terminal. The second resistor R2 is connected to the base of the first transistor D1. The collector of the first transistor D1 is connected to the power supply. The emitter of the first transistor D1 is connected to one end of the coil of the first relay K1. The other end of the coil of the first relay K1 is connected to the ground terminal. One end of the normally closed contact of the first relay K1 is connected to the power supply. The other end of the normally closed contact of the first relay K1 is connected to the first output terminal OUT1 and the anode of the second LED D2. The cathode of the second LED D2 is connected to the ground terminal. The fourth probe IN4 is connected to the second output terminal OUT2 and the anode of the third LED D3. The cathode of the third LED D3 is connected to the ground terminal.

[0004] Furthermore, the control module also includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first operational amplifier U1, a second capacitor C2, and a fourth transistor D4. One end of the third resistor R3 is connected to the third probe IN3, and one end of the fourth resistor R4 is connected to the power supply. The other end of the fourth resistor R4 is connected to the inverting input of the first operational amplifier U1, and the non-inverting input of the first operational amplifier U1 is connected to the power supply. The output terminal of the first operational amplifier U1 is connected to the base of the fourth transistor D4, and one end of the sixth resistor R6 is connected to the ground terminal. The emitter of the fourth transistor D4 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the fourth probe IN4, one end of the second capacitor C2, and the anode of the third light-emitting diode D3. The other end of the second capacitor C2 is connected to the ground terminal. The collector of the fourth transistor D4 is connected to the ground terminal.

[0005] Furthermore, the control module also includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth potentiometer R10, a fifth light-emitting diode D5, a sixth transistor D6, and a seventh transistor D7. One end of the seventh resistor R7 is connected to the power supply and one end of the eighth resistor R8. The other end of the seventh resistor R7 is connected to the anode of the second light-emitting diode D2, one end of the ninth resistor R9, and the collector of the seventh transistor D7. The other end of the eighth resistor R8 is connected to the anode of the fifth light-emitting diode D5, the collector of the sixth transistor D6, and one end of the tenth potentiometer R10. The other end of the ninth resistor R9 is connected to the base of the sixth transistor D6. The other end of the tenth potentiometer R10 is connected to the base of the seventh transistor D7. The emitter of the seventh transistor D7 is connected to the emitter of the sixth transistor D6 and the ground terminal.

[0006] Furthermore, the control module also includes an eleventh resistor R11, an eighth PMOS transistor D8, a ninth phototransistor D9, a second relay K2, and a third output terminal OUT3. The third output terminal OUT3 is connected to the anode of the fifth light-emitting diode D5. One end of the normally open contact of the second relay K2 is connected to the collector of the sixth phototransistor D6, and the other end of the normally open contact of the second relay K2 is connected to the power supply. One end of the coil of the second relay K2 is connected to the ground terminal, and the other end of the coil of the second relay K2 is connected to the drain of the eighth PMOS transistor D8. The source of the eighth PMOS transistor D8 is connected to the power supply. The gate of the eighth PMOS transistor D8 is connected to one end of the eleventh resistor R11 and the collector of the ninth phototransistor D9. The other end of the eleventh resistor R11 is connected to the power supply. The emitter of the ninth phototransistor D9 is connected to the ground terminal, and the ninth phototransistor D9 is coupled to the third light-emitting diode D3.

[0007] Furthermore, the control module also includes a twelfth resistor R12 and a thirteenth potentiometer R13. One end of the twelfth resistor R12 is connected to the power supply, the other end of the twelfth resistor R12 is connected to one end of the thirteenth potentiometer R13, the tap of the thirteenth potentiometer R13 is connected to the non-inverting input of the first operational amplifier U1, and the other end of the thirteenth potentiometer R13 is connected to the ground terminal.

[0008] Furthermore, the control module also includes a tenth light-emitting diode D10, the anode of which is connected to the emitter of the first transistor D1, and the cathode of which is connected to the coil of the first relay K1.

[0009] Furthermore, the control module also includes a fourteenth resistor R14, one end of which is connected to the gate of the eighth PMOS transistor D8, and the other end of which is connected to the ground terminal.

[0010] Furthermore, the control module also includes a fifteenth resistor R15, the two ends of which are connected in series between the first probe IN1 and the power supply.

[0011] Furthermore, the control module also includes a sixteenth resistor R16, the two ends of which are connected in series between the source of the eighth PMOS transistor D8 and the power supply.

[0012] The beneficial effects of this invention compared to the prior art are:

[0013] This invention addresses the issue of abnormal water levels caused by fluctuations in liquid level, where the peak amplitude of the fluctuation is higher than that of the liquid level sensor and the trough amplitude is lower than that of the liquid level sensor, by using a small number of components. It prevents the abnormal water level caused by the fluctuations in liquid level due to the entry and exit of the paint stripping tank by the hanger. At the same time, it solves the problem of the need for a timer to control the start-up time of the water pump after the original liquid is replenished beyond the liquid level sensor, thereby reducing the cost of circuit system construction. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This invention provides a schematic diagram of the control module circuit structure for an automated online paint stripping system for hangers. Detailed Implementation

[0016] To make the objectives and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection specifically claimed by the present invention.

[0017] Referring to the accompanying drawings, the present invention provides an automated online paint stripping system for hangers, including a control module. The control module includes a first resistor R1, a second resistor R2, a first transistor D1, a second light-emitting diode D2, a third light-emitting diode D3, a first probe IN1, a second probe IN2, a third probe IN3, a fourth probe IN4, a first relay K1, a first capacitor C1, a first output terminal OUT1, and a second output terminal OUT2. The first probe IN1 and the third probe IN3 are connected to a power supply. The second probe IN2 is connected to one end of the first resistor R1, one end of the second resistor R2, and one end of the first capacitor C1. The other end of the first resistor R1 is connected to the first... The other end of capacitor C1 is connected to ground; the other end of the second resistor R2 is connected to the base of the first transistor D1; the collector of the first transistor D1 is connected to the power supply; the emitter of the first transistor D1 is connected to one end of the coil of the first relay K1; the other end of the coil of the first relay K1 is connected to ground; one end of the normally closed contact of the first relay K1 is connected to the power supply; the other end of the normally closed contact of the first relay K1 is connected to the first output terminal OUT1 and the anode of the second LED D2; the cathode of the second LED D2 is connected to ground; the fourth probe IN4 and the second output terminal OUT2 are connected to the anode of the third LED D3; the cathode of the third LED D3 is connected to ground.

[0018] To prevent level fluctuations caused by frequent entry and exit of the paint stripper tub when it is about to reach the paint stripper replenishment zone, a water pump start signal is frequently sent when the peak amplitude of the fluctuation is higher than the replenishment point and the trough amplitude is lower than the replenishment point. The first probe (IN1 and IN2) detects the replenishment point, and the second probe (IN3 and IN4) detects the stop replenishment point. When the peak of the level fluctuation is higher than the replenishment point and the trough is lower than the replenishment point, during the peak period, the power signal passes through the first probe (IN1), the liquid, and the second probe (IN2) to the first capacitor C1. After the potential of the first capacitor C1 continues to rise, one path of the power signal goes to the second resistor R2, and the other path forms a loop through the first resistor R1 to reach the second resistor R2. The signal is amplified after passing through the base of the first transistor D1 and then through the collector of the first transistor D1. The amplified signal then passes through the collector and emitter of the first transistor D1 and reaches the coil of the first relay K1, causing the normally closed contact of the first relay K1 to open. When the trough is reached, due to the open circuit of the first probe IN1 and the second probe IN2, the signal provided by the first capacitor C1 passes through the second resistor R2 and reaches the base of the first transistor D1, continuously amplifying the power signal at the collector of the first transistor D1. When the peak is reached again, the first capacitor C1 is compensated. When the peak value of the liquid level fluctuation is lower than the liquid level replenishment point, the potential of the first capacitor C1 continues to drop, causing the first transistor D1 to be cut off. The normally closed contact of the first relay K1 closes, and the power feedback signal is sent to the first output terminal OUT1 to start the water pump, preventing the water pump start signal from being frequently interrupted during liquid level fluctuations.

[0019] Specifically, the control module also includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first operational amplifier U1, a second capacitor C2, and a fourth transistor D4. One end of the third resistor R3 is connected to the third probe IN3 and one end of the fourth resistor R4, and the other end of the third resistor R3 is connected to the power supply. The other end of the fourth resistor R4 is connected to the inverting input of the first operational amplifier U1, and the non-inverting input of the first operational amplifier U1 is connected to the power supply. The output terminal of the first operational amplifier U1 is connected to the base of the fourth transistor D4 and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the ground terminal. The emitter of the fourth transistor D4 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the fourth probe IN4, one end of the second capacitor C2, and the anode of the third light-emitting diode D3. The other end of the second capacitor C2 is connected to the ground terminal. The collector of the fourth transistor D4 is connected to the ground terminal.

[0020] To prevent the second probe, composed of the third probe IN3 and the fourth probe IN4, from being higher than the liquid level stop point during liquid level fluctuations, a pump shutdown signal is sent, causing the current liquid level to fall below the set stop point. At the peak of the fluctuation, the power signal passes through the third resistor R3, the third probe IN3, and the fourth probe IN4 to the second capacitor C2, causing the potential of the second capacitor C2 to rise continuously. Simultaneously, the power signal passes through the fourth resistor R4 to the inverting input of the first operational amplifier U1. Due to the voltage division caused by the conduction of the third probe IN3 and the fourth probe IN4, the voltage signal at the inverting input of the first operational amplifier U1 is less than the threshold signal at the non-inverting input. The output signal of the first operational amplifier U1 goes through two paths: one to the base of the fourth transistor D4, causing the base potential of the fourth transistor D4 to be higher than its emitter potential, thus cutting off the fourth transistor D4; the other path forms a loop through the sixth resistor R6. Conversely, at the trough of the fluctuation, the first operational amplifier U1... The phase terminal voltage is equal to the voltage drop after the power supply passes through the third resistor R3 and the fourth resistor R4. It is greater than the voltage signal at the non-inverting input of the first operational amplifier U1. There is no signal output at the output terminal of the first operational amplifier U1. The charging signal of the second capacitor C2 at the peak of the wave forms a circuit through the fifth resistor R5, the emitter and base of the fourth transistor D4, and the sixth resistor R6, which puts the fourth transistor D4 in the conducting state. The signal of the second capacitor C2 can be discharged through the fifth resistor R5, the emitter and collector of the fourth transistor D4, to prevent the fluctuation frequency period from causing the water pump to be sent prematurely. When the wave is at the liquid level stop replenishment point of the second probe, the potential of the second capacitor C2 rises to the conduction threshold of the third light-emitting diode D3. The second output terminal OUT2 sends a shutdown signal to the water pump. That is, the voltage threshold threshold of the water pump shutdown signal output by the second output terminal OUT2 is used. Then the third light-emitting diode D3 is turned on, and the signal of the second output terminal OUT2 falls back.

[0021] Specifically, the control module also includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth potentiometer R10, a fifth light-emitting diode D5, a sixth transistor D6, and a seventh transistor D7. One end of the seventh resistor R7 is connected to the power supply and one end of the eighth resistor R8. The other end of the seventh resistor R7 is connected to the anode of the second light-emitting diode D2, one end of the ninth resistor R9, and the collector of the seventh transistor D7. The other end of the eighth resistor R8 is connected to the anode of the fifth light-emitting diode D5, the collector of the sixth transistor D6, and one end of the tenth potentiometer R10. The other end of the ninth resistor R9 is connected to the base of the sixth transistor D6. The other end of the tenth potentiometer R10 is connected to the base of the seventh transistor D7. The emitter of the seventh transistor D7 is connected to the emitter of the sixth transistor D6 and the ground terminal.

[0022] To prevent the water pump from starting during replenishment when the liquid level in the paint stripping tank exceeds the replenishment point, a timer is needed for control when the liquid level exceeds the replenishment point. When the normally open contact of the first relay K1 closes, the power signal also reaches the sixth transistor D6 through the ninth resistor R9, causing the sixth transistor D6 to enter saturation. The collector of the sixth transistor D6 is forward biased, and at this time, the base potential of the sixth transistor D6 is greater than the conduction potential of the second light-emitting diode D2. When the liquid level exceeds the replenishment point, the normally open contact of the first relay K1 opens, and the power signal reaches the second light-emitting diode D2 and the first output terminal OUT1 through the seventh resistor R7. The second LED D2 is continuously conducting, causing the first output terminal OUT1 to continuously send a start signal. In the initial state, the conduction threshold of the second LED D2 is higher than the base potential of the sixth transistor D6. The power signal forms a circuit through the seventh resistor R7, the ninth resistor R9, the base and emitter of the sixth transistor D6, causing the sixth transistor D6 to be in an amplification state. At this time, the base potential of the sixth transistor D6 is lower than the conduction potential of the second LED D2, realizing the holding function when the signal at the first output terminal OUT1 has no transition, and the delay function when the normally open contact of the first relay K1 is opened, which is about to transition the signal at the first output terminal OUT1.

[0023] Specifically, the control module also includes an eleventh resistor R11, an eighth PMOS transistor D8, a ninth phototransistor D9, a second relay K2, and a third output terminal OUT3. The third output terminal OUT3 is connected to the anode of the fifth light-emitting diode D5. One end of the normally open contact of the second relay K2 is connected to the collector of the sixth phototransistor D6, and the other end of the normally open contact of the second relay K2 is connected to the power supply. One end of the coil of the second relay K2 is connected to the ground terminal, and the other end of the coil of the second relay K2 is connected to the drain of the eighth PMOS transistor D8. The source of the eighth PMOS transistor D8 is connected to the power supply. The gate of the eighth PMOS transistor D8 is connected to one end of the eleventh resistor R11 and the collector of the ninth phototransistor D9. The other end of the eleventh resistor R11 is connected to the power supply. The emitter of the ninth phototransistor D9 is connected to the ground terminal. The ninth phototransistor D9 is coupled to the third light-emitting diode D3.

[0024] To prevent the signal at the first output terminal OUT1 from being stuck and unable to reset when the liquid level is above or below the high / low level, the third LED D3 and the ninth phototransistor D9 are coupled and packaged. When the potential of the second capacitor C2 continues to rise until the third LED D3 conducts, the third LED D3 and the ninth phototransistor D9 are optically coupled, and the ninth phototransistor D9 conducts. The power signal then flows through the eleventh resistor R1. 1. The ninth phototransistor D9 forms a circuit. At this time, the gate-source potential of the eighth PMOS transistor D8 reaches the negative voltage difference required for conduction, and the eighth PMOS transistor D8 conducts. The power signal reaches the coil of the second relay K2 through the eighth PMOS transistor D8. The coil of the second relay K2 closes, causing the normally open contact of the second relay K2 to close. The power signal at one end of the normally open contact of the second relay K2 reaches the collector of the sixth transistor D6, making the N-region potential of the collector junction of the sixth transistor D6 greater than the P-region potential. The collector junction is reverse biased, making the base potential of the sixth transistor D6 lower than the conduction potential of the second light-emitting diode D2. The power signal at one end of the seventh resistor R7 again forms a circuit through the seventh resistor R7, the ninth resistor R9, the base and emitter of the sixth transistor D6, realizing the start signal jump reset of the water pump.

[0025] To prevent the signal detection circuit inside the water pump from delaying detection after power fluctuations, thus failing to detect the water pump stop signal before the potential of the second capacitor C2 reaches the conduction threshold of the third LED D3, and to prevent the second output terminal OUT2 signal from falling back and losing the water pump stop signal sent by the second output terminal OUT2 after the third LED D3 conducts, a third output terminal OUT3 is set between the eighth resistor R8 and the fifth LED D5. The water pump stop signal is transmitted through the third output terminal OUT3. The voltage signal of the normally open contact of the second relay K2 reaches the collector of the sixth transistor D6 and simultaneously reaches the base of the seventh transistor D7 through the tenth LED D10, causing the seventh transistor D7 to enter the saturation state from the amplification state. The collector junction of the seventh transistor D7 is forward biased, that is, the potential of the P region is greater than the potential of the N region. The potential of the fifth LED D5 is lower than the potential of the seventh transistor D7, so the fifth LED D5 conducts. The power signal at the eighth resistor R8 forms a loop through the fifth LED D5, and the third output terminal OUT3 sends the water pump stop signal.

[0026] Specifically, the control module also includes a twelfth resistor R12 and a thirteenth potentiometer R13. One end of the twelfth resistor R12 is connected to the power supply, and the other end of the twelfth resistor R12 is connected to one end of the thirteenth potentiometer R13. The tap of the thirteenth potentiometer R13 is connected to the non-inverting input of the first operational amplifier U1, and the other end of the thirteenth potentiometer R13 is connected to the ground terminal.

[0027] To prevent signal interference from causing the reference signal at the non-inverting input of the first operational amplifier U1 to be higher than the power supply signal reaching the inverting input of the first operational amplifier U1 during the period when the third probe IN3 and the fourth probe IN4 are open, the first operational amplifier U1 outputs a high-level signal, which cuts off the fourth transistor D4 and leaves the second capacitor C2 without a circuit. A voltage divider circuit is formed by the twelfth resistor R12 and the thirteenth potentiometer R13 to prevent the reference signal from being unable to be down-adjusted during abnormal interference.

[0028] Specifically, the control module also includes a tenth light-emitting diode D10, the anode of which is connected to the emitter of the first transistor D1, and the cathode of which is connected to the coil of the first relay K1.

[0029] The tenth LED, D10, indicates the water pump's start status to the operator.

[0030] Specifically, the control module further includes a fourteenth resistor R14, one end of which is connected to the gate of the eighth PMOS transistor D8, and the other end of which is connected to ground.

[0031] The fourteenth resistor R14 is set to discharge the internal parasitic capacitance of the eighth PMOS transistor D8, preventing the eighth PMOS transistor D8 from being damaged after oscillation.

[0032] Specifically, the control module also includes a fifteenth resistor R15, the two ends of which are connected in series between the first probe IN1 and the power supply:

[0033] The fifteenth resistor R15 is used to limit the current of the first capacitor C1.

[0034] Specifically, the control module also includes a sixteenth resistor R16, the two ends of which are connected in series between the source of the eighth PMOS transistor D8 and the power supply.

[0035] Set the sixteenth resistor R16 to prevent the eighth PMOS transistor D8 from being damaged by overcurrent.

Claims

1. An automated online paint stripping system for hangers, comprising a control module, characterized in that, The control module includes a first resistor, a second resistor, a first transistor, a second light-emitting diode (LED), a third LED, a first probe, a second probe, a third probe, a fourth probe, a first relay, a first capacitor, a first output terminal, and a second output terminal. The first and third probes are connected to a power supply. The second probe is connected to one end of the first resistor, one end of the second resistor, and one end of the first capacitor. The other end of the first resistor, the other end of the first capacitor, and a ground terminal are connected. The other end of the second resistor is connected to the base of the first transistor. The collector of the first transistor is connected to a power supply. The emitter of the first transistor is connected to one end of the coil of the first relay. The other end of the coil of the first relay is connected to a ground terminal. One end of the normally closed contact of the first relay is connected to a power supply. The other end of the normally closed contact of the first relay is connected to the first output terminal and the anode of the second LED. The cathode of the second LED is connected to a ground terminal. The fourth probe is connected to the second output terminal and the anode of the third LED. The first probe and the second probe together form a first probe to detect the liquid level replenishment point. The third probe and the fourth probe together form a second probe to detect the liquid level stop replenishment point. The cathode of the third LED is connected to a ground terminal. The control module also includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth potentiometer, a fifth light-emitting diode, a sixth transistor, and a seventh transistor. One end of the seventh resistor is connected to the power supply and one end of the eighth resistor. The other end of the seventh resistor is connected to the anode of the second light-emitting diode, one end of the ninth resistor, and the collector of the seventh transistor. The other end of the eighth resistor is connected to the anode of the fifth light-emitting diode, the collector of the sixth transistor, and one end of the tenth potentiometer. The other end of the ninth resistor is connected to the base of the sixth transistor. The other end of the tenth potentiometer is connected to the base of the seventh transistor. The emitter of the seventh transistor is connected to the emitter of the sixth transistor and the ground terminal.

2. The automated online paint stripping system for hangers according to claim 1, characterized in that, The control module also includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first operational amplifier, a second capacitor, and a fourth transistor. One end of the third resistor is connected to a third probe, one end of the fourth resistor is connected to a power supply, the other end of the fourth resistor is connected to the inverting input of the first operational amplifier, the non-inverting input of the first operational amplifier is connected to a power supply, the output of the first operational amplifier is connected to the base of the fourth transistor and one end of the sixth resistor, the other end of the sixth resistor is connected to ground, the emitter of the fourth transistor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the fourth probe, one end of the second capacitor, and the anode of the third light-emitting diode, the other end of the second capacitor is connected to ground, and the collector of the fourth transistor is connected to ground.

3. The automated online paint stripping system for hangers according to claim 1, characterized in that, The control module also includes an eleventh resistor, an eighth PMOS transistor, a ninth phototransistor, a second relay, and a third output terminal. The third output terminal is connected to the anode of the fifth LED. One end of the normally open contact of the second relay is connected to the collector of the sixth LED, and the other end of the normally open contact of the second relay is connected to the power supply. One end of the coil of the second relay is connected to the ground terminal, and the other end of the coil of the second relay is connected to the drain of the eighth PMOS transistor. The source of the eighth PMOS transistor is connected to the power supply. The gate of the eighth PMOS transistor is connected to one end of the eleventh resistor and the collector of the ninth phototransistor. The other end of the eleventh resistor is connected to the power supply. The emitter of the ninth phototransistor is connected to the ground terminal, and the ninth phototransistor is coupled to the third LED.

4. The automated online paint stripping system for hangers according to claim 2, characterized in that, The control module also includes a twelfth resistor and a thirteenth potentiometer. One end of the twelfth resistor is connected to the power supply, the other end of the twelfth resistor is connected to one end of the thirteenth potentiometer, the tap of the thirteenth potentiometer is connected to the non-inverting input of the first operational amplifier, and the other end of the thirteenth potentiometer is connected to the ground terminal.

5. The automated online paint stripping system for hangers according to claim 1, characterized in that, The control module also includes a tenth light-emitting diode, the anode of which is connected to the emitter of the first transistor, and the cathode of which is connected to the coil of the first relay.

6. The automated online paint stripping system for hangers according to claim 3, characterized in that, The control module also includes a fourteenth resistor, one end of which is connected to the gate of the eighth PMOS transistor, and the other end of which is connected to the ground terminal.

7. The automated online paint stripping system for hangers according to claim 1, characterized in that, The control module also includes a fifteenth resistor, the two ends of which are connected in series between the first probe and the power supply.

8. The automated online paint stripping system for hangers according to claim 1, characterized in that, The control module also includes a sixteenth resistor, the two ends of which are connected in series between the source of the eighth PMOS transistor and the power supply.

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