Elevator safety circuit detection training system

Abstract

The invention discloses an elevator safety circuit detection practical training system, which comprises a calculation module, the calculation module comprises a plurality of operational amplifiers, a plurality of resistors, a solid-state relay, a capacitor and a diode, the in-phase end of the operational amplifier U2 is connected with one end of a resistor R8 and an IN4 end, the anti-phase end of the operational amplifier U2 is connected with one end of a resistor R7 and an OUT2 end, and the output end of the operational amplifier U2 is connected with the other end of the resistor R7 and one end of a solid-state relay S2; the in-phase end of the operational amplifier U3 is connected with one end of the resistor R9 and the other end of the solid-state relay S2, the anti-phase end is connected with one end of the capacitor C1 and the cathode of the diode D1, and the output end is connected with the anode of the diode D1; the other end of the resistor R8 is connected with the IN1-2 end; the other end of the capacitor C1, the other end of the resistor R9 and the cathode of the solid-state relay S2 are grounded.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator safety circuit detection training, and particularly relates to an elevator safety circuit detection training system. Background Art

[0002] The safety circuit training system can be designed and arranged in a simulated small hoistway according to the positions of each switch in the real elevator safety circuit, helping trainees learn the specific positions of each circuit switch in the elevator safety circuit in an environment without actual risks. By artificially setting faults, trainees can more intuitively understand the state of the safety circuit during faults. However, due to different elevator brands, the safety circuit structures and the number of circuit switches are different, and trainees need to understand and learn the circuit differences of different elevator models. Therefore, an elevator safety circuit detection training system is proposed, which enables trainees to quickly master the circuit differences of different elevator models through real-time update of the total number of switches, automatically calculate the number of all faulty switches (artificially set faults and non-artificially set faults) in the safety circuit to help trainees accelerate fault location, and strengthen trainees' understanding of the safety circuit structure. Summary of the Invention

[0003] In view of the above technical problems, the object of the present invention is to provide an elevator safety circuit detection training system, including a calculation module. The calculation module includes several operational amplifiers, several resistors, a solid-state relay, a capacitor, and a diode. The non-inverting input terminal of operational amplifier U2 in the several operational amplifiers is connected to one end of resistor R8 and IN4 terminal, the inverting input terminal is connected to one end of resistor R7 and OUT2 terminal, and the output terminal is connected to the other end of resistor R7 and one end of solid-state relay S2; the non-inverting input terminal of operational amplifier U3 is connected to one end of resistor R9 and the other end of solid-state relay S2, the inverting input terminal is connected to one end of capacitor C1 and the cathode of diode D1, and the output terminal is connected to the anode of diode D1; the other end of resistor R8 is connected to IN1-2 terminal; the other end of capacitor C1, the other end of resistor R9, and the negative electrode of solid-state relay S2 are grounded.

[0004] Further, the calculation module further includes several operational amplifiers, several resistors, a solid-state relay, and a trigger. The non-inverting input terminal of operational amplifier U6 in the several operational amplifiers is connected to one end of resistor R10 and one end of resistor R19, the inverting input terminal is connected to one end of resistor R11 and one end of resistor R17, and the output terminal is connected to the other end of resistor R11 and one end of solid-state relay S3; the non-inverting input terminal of operational amplifier U7 is connected to the cathode of diode D1, the inverting input terminal is connected to the output terminal and the other end of resistor R10; the non-inverting input terminal of operational amplifier U8 is connected to the output terminal of operational amplifier U2, the inverting input terminal is connected to the output terminal and the other end of resistor R17; the first pin and the fourth pin of trigger U4 are connected to the power supply, the second pin is connected to the sixth pin, and the third pin is connected to IN5 terminal; the other end of solid-state relay S3 is connected to one end of resistor R18; the other end of resistor R18, the other end of resistor R19, and the negative electrode of solid-state relay S3 are grounded.

[0005] Further, the calculation module further includes a field effect transistor, a capacitor, an operational amplifier, a solid state relay, an inverter, and several resistors. The non-inverting input terminal of operational amplifier U9 among the several operational amplifiers is connected to one end of resistor R16 and the drain of field effect transistor Q4, the inverting input terminal is connected to one end of resistor R14 and one end of resistor R15, and the output terminal is connected to the positive pole of solid state relay S1; the input terminal of inverter U5 is connected to the fifth pin of trigger U4, the gate of field effect transistor Q4, one end of resistor R12, and the positive pole of solid state relay S3, and the output terminal is connected to the positive pole of solid state relay S2; the source of field effect transistor Q4 is connected to the other end of resistor R12, one end of resistor R13, and one end of capacitor C2; one end of solid state relay S1 is connected to the inverting input terminal of operational amplifier U3; the other end of capacitor C2, the other end of resistor R13, the other end of resistor R14, the other end of resistor R16, the other end of solid state relay S1, and the negative pole of solid state relay S1 are grounded.

[0006] Further, it further includes a feedback module. The feedback module includes several resistors and operational amplifiers. The non-inverting input terminal of operational amplifier U1 among the several operational amplifiers is connected to one end of resistor R6 and IN2 terminal, and the inverting input terminal is connected to one end of resistor R4 and one end of resistor R5; the other end of resistor R5 is connected to the power supply; the other ends of resistor R4 and resistor R6 are grounded.

[0007] Further, the feedback module further includes several field effect transistors and several resistors. The source of field effect transistor Q1 among the several field effect transistors is connected to OUT1 terminal, the drain is connected to one end of resistor R2, and the gate is connected to the gates of field effect transistor Q2, field effect transistor Q3, and the output terminal of operational amplifier U1; the drain of field effect transistor Q2 is connected to IN1-1 terminal, and the source is connected to the other end of resistor R2; the drain of field effect transistor Q3 is connected to IN3 terminal, and the source is connected to one end of resistor R1; the other end of resistor R1 is grounded.

[0008] Further, the feedback module further includes a resistor. One end of resistor R3 is connected to the gate of field effect transistor Q1, and the other end is grounded.

[0009] Further, it further includes a display module. The display module is connected to the calculation module, and the display module displays the quantity status of the loop switches in the safety loop based on the signal fed back by the calculation module.

[0010] The beneficial effects of the present invention compared with the prior art are as follows: The present invention can calculate and record the total number of loop switches. When the number of switches is increased or decreased, the calculation and record are updated in real time, helping trainees quickly master the loop differences of different elevator models. After artificially setting a faulty switch, it automatically calculates the total number of faulty switches in the safety loop (artificial fault setting and non-artificial fault setting) to help trainees accelerate fault location and strengthen trainees' understanding of the safety loop structure. Description of the Drawings

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the attached drawings required in the prior art and the embodiments. Obviously, the attached drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0012] Figure 1 Schematic diagram of the calculation module circuit provided by the present invention.

[0013] Figure 2 Schematic diagram of the feedback module circuit provided by the present invention. Detailed implementation manners

[0014] In order to make the purpose and advantages of the present invention more clear and understandable, the following specifically describes the present invention in combination with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the protection scope of the specific claims of the present invention.

[0015] The present invention discloses an elevator safety circuit detection training system, including a calculation module. The calculation module includes several operational amplifiers, several resistors, a solid-state relay, a capacitor, and a diode. The non-inverting input terminal of operational amplifier U2 in the several operational amplifiers is connected to one end of resistor R8 and IN4 terminal, the inverting input terminal is connected to one end of resistor R7 and OUT2 terminal, and the output terminal is connected to the other end of resistor R7 and one end of solid-state relay S2; the non-inverting input terminal of operational amplifier U3 is connected to one end of resistor R9 and the other end of solid-state relay S2, the inverting input terminal is connected to one end of capacitor C1 and the cathode of diode D1, and the output terminal is connected to the anode of diode D1; the other end of resistor R8 is connected to IN1-2 terminal; the other end of capacitor C1, the other end of resistor R9, and the negative electrode of solid-state relay S2 are grounded.

[0016] Specifically, the calculation module further includes several operational amplifiers, several resistors, a solid-state relay, and a trigger. The non-inverting input terminal of operational amplifier U6 in the several operational amplifiers is connected to one end of resistor R10 and one end of resistor R19, the inverting input terminal is connected to one end of resistor R11 and one end of resistor R17, and the output terminal is connected to the other end of resistor R11 and one end of solid-state relay S3; the non-inverting input terminal of operational amplifier U7 is connected to the cathode of diode D1, the inverting input terminal is connected to the output terminal and the other end of resistor R10; the non-inverting input terminal of operational amplifier U8 is connected to the output terminal of operational amplifier U2, the inverting input terminal is connected to the output terminal and the other end of resistor R17; the first pin and the fourth pin of trigger U4 are connected to the power supply, the second pin is connected to the sixth pin, and the third pin is connected to IN5 terminal; the other end of solid-state relay S3 is connected to one end of resistor R18; the other end of resistor R18, the other end of resistor R19, and the negative electrode of solid-state relay S3 are grounded.

[0017] Specifically, the calculation module further includes a field effect transistor, a capacitor, an operational amplifier, a solid state relay, an inverter, and several resistors. The non-inverting input terminal of operational amplifier U9 among the several operational amplifiers is connected to one end of resistor R16 and the drain of field effect transistor Q4. The inverting input terminal is connected to one end of resistor R14 and one end of resistor R15. The output terminal is connected to the positive pole of solid state relay S1. The input terminal of inverter U5 is connected to the fifth pin of trigger U4, the gate of field effect transistor Q4, one end of resistor R12, and the positive pole of solid state relay S3. The output terminal is connected to the positive pole of solid state relay S2. The source of field effect transistor Q4 is connected to the other end of resistor R12, one end of resistor R13, and one end of capacitor C2. One end of solid state relay S1 is connected to the inverting input terminal of operational amplifier U3. The other end of capacitor C2, the other end of resistor R13, the other end of resistor R14, the other end of resistor R16, the other end of solid state relay S1, and the negative pole of solid state relay S1 are grounded.

[0018] Specifically, it further includes a feedback module. The feedback module includes several resistors and operational amplifiers. The non-inverting input terminal of operational amplifier U1 among the several operational amplifiers is connected to one end of resistor R6 and IN2 terminal. The inverting input terminal is connected to one end of resistor R4 and one end of resistor R5. The other end of resistor R5 is connected to the power supply. The other end of resistor R4 and the other end of resistor R6 are grounded.

[0019] Specifically, the feedback module further includes several field effect transistors and several resistors. The source of field effect transistor Q1 among the several field effect transistors is connected to OUT1 terminal. The drain is connected to one end of resistor R2. The gate is connected to the gates of field effect transistor Q2, field effect transistor Q3, and the output terminal of operational amplifier U1. The drain of field effect transistor Q2 is connected to IN1-1 terminal. The source is connected to the other end of resistor R2. The drain of field effect transistor Q3 is connected to IN3 terminal. The source is connected to one end of resistor R1. The other end of resistor R1 is grounded.

[0020] Specifically, the feedback module further includes a resistor. One end of resistor R3 is connected to the gate of field effect transistor Q1, and the other end is grounded.

[0021] Specifically, it further includes a display module. The display module is connected to the calculation module and displays the quantity status of the in-loop switches in the safety loop based on the signal fed back by the calculation module.

[0022] Refer to Figure 1 、 Figure 2, there are multiple feedback modules. One feedback module is set between two series-connected loop switches in the safety loop, and no feedback module is set between the loop switches for maintenance. The IN1-1 terminals in all feedback modules synchronously obtain the reference basic signal of a single loop switch. When all loop switches are connected in series and adjusted to the closed state, when powered on, the signal between every two series-connected loop switches is fed back to IN2 on the feedback module. This signal goes to the ground terminal through resistor R6, and the signal at the resistor R6 terminal is fed back to the non-inverting input terminal of operational amplifier U1. The power supply signal goes to the ground terminal through resistor R5 and resistor R4, and the signal at the resistor R4 terminal is fed back to the inverting input terminal of operational amplifier U1. Operational amplifier U1 outputs, and the signal at the output terminal of operational amplifier U1 is fed back to the gates of field-effect transistors Q1, Q2, and Q3. The voltage difference between the gate and source of field-effect transistor Q1 is higher than the conduction threshold, so field-effect transistor Q1 conducts. The voltage difference between the gate and source of field-effect transistor Q2 is higher than the conduction threshold, so field-effect transistor Q2 conducts. The voltage difference between the gate and source of field-effect transistor Q3 is higher than the conduction threshold, so field-effect transistor Q3 conducts. The basic signal passes through the drain of field-effect transistor Q2, the source of field-effect transistor Q2, resistor R2, the drain of field-effect transistor Q1, and the source of field-effect transistor Q1 and is fed back to the calculation module through OUT1. Resistor R3 is used to discharge the parasitic capacitance of the gates of field-effect transistors Q1, Q2, and Q3. The IN1-2 terminal in the calculation module synchronously obtains the reference basic signal of a single loop switch. The signal is fed back to the non-inverting input terminal of operational amplifier U2 through resistor R8. The output terminal of operational amplifier U2 is connected in negative feedback with the inverting input terminal of operational amplifier U2 through resistor R7. IN4 in the calculation module is used to obtain the reference basic signal fed back by all feedback modules through OUT1. At the same time, the signal at the inverting input terminal of operational amplifier U2 is fed back to IN3 on all feedback modules through OUT2. When a signal is obtained at IN2 in any feedback module, field-effect transistors Q1, Q2, and Q3 conduct, and the calculation module obtains the reference basic signal fed back by this feedback module through OUT1. At the same time, the signal at the IN3 terminal of this feedback module goes to the ground terminal through the drain of field-effect transistor Q3, the source of field-effect transistor Q3, and resistor R1. At this time, the amplitude of the signal at the output terminal of operational amplifier U2 is the signal of the number of series-connected loop switches in the entire safety loop, so as to automatically calculate the total number of loop switches in the safety loop when the safety loop is powered on.

[0023] Refer to Figure 1, the signal at the output terminal of the operational amplifier U2 passes through the solid-state relay S2 and the resistor R9 to the ground terminal, and the signal at the resistor R9 terminal is fed back to the non-inverting terminal of the operational amplifier U3. The signal at the output terminal of the operational amplifier U3 is fed back to the inverting terminal of the operational amplifier U3 through the diode D1. The operational amplifier U3 outputs, and the diode D1 prevents reverse connection. The potential of the capacitor C1 rises to the amplitude of the signal at the output terminal of the operational amplifier U2, so as to record the signal of the total number of series switches in the safety loop. When artificial faults are set for any number of loop switches in the safety loop, the IN2 in the feedback module between the loop switches connected in series upward from the faulty loop switch closest to the signal input terminal of the safety loop and the feedback module between all loop switches connected in series downward from it loses signal feedback, the operational amplifier U1 is cut off, the calculation module loses the reference basic signal fed back by the corresponding feedback module, and the signal at the output terminal of the operational amplifier U2 decreases. At this time, the amplitude of the signal at the output terminal of the operational amplifier U2 is the number of loop switches that can be normally transmitted. In this way, after automatically calculating the total number of loop switches, the signal of the total number of loop switches is recorded and the number of remaining loop switches that can be normally transmitted is automatically calculated when setting any number of faulty loop switches.

[0024] Refer to Figure 1, IN5 is used to input the signal indicating that the number of loop switches is set. This signal is fed back by the operator or the terminal. After the loop switches in the safety loop are connected in series and powered on, the signal is fed back to IN5. In the initial state, the 5-pin terminal of the flip-flop U4 is at a low level. When a signal is obtained at the IN5 terminal and fed back to the 3-pin terminal of the flip-flop U4, the 5-pin terminal of the flip-flop U4 becomes high level. The signal at the 5-pin terminal of the flip-flop U4 is fed back to the input terminal of the inverter U5. The inverter U5 inverts the input signal. The output signal of the inverter U5 is fed back to the positive pole of the solid-state relay S2, and the solid-state relay S2 is turned off. At the same time, the signal at the 5-pin terminal of the flip-flop U4 is fed back to the positive pole of the solid-state relay S3, and the solid-state relay S3 is turned on. The output signal of the operational amplifier U2 is synchronously fed back to the non-inverting input terminal of the operational amplifier U8. The output terminal and the inverting input terminal of the operational amplifier U8 are connected in negative feedback. The output terminal of the operational amplifier U8 follows the output signal of the operational amplifier U2. The output signal of the operational amplifier U8 is fed back to the inverting input terminal of the operational amplifier U6 through the resistor R17. The output terminal of the operational amplifier U6 is connected to the inverting input terminal of the operational amplifier U6 in negative feedback through the resistor R11. The signal at the C1 terminal of the capacitor is fed back to the non-inverting input terminal of the operational amplifier U7. The output terminal and the inverting input terminal of the operational amplifier U7 are connected in negative feedback. The output terminal of the operational amplifier U7 follows the output signal of the C1 terminal of the capacitor. The output signal of the operational amplifier U7 is connected to the ground terminal through the resistor R10 and the resistor R19. The signal at the R19 terminal is fed back to the non-inverting input terminal of the operational amplifier U6. The operational amplifier U6 outputs the difference between the amplitude of the total number of loop switches and the amplitude of the remaining loop switches that can be normally transmitted. The amplitude of the output signal of the operational amplifier U6 is the number of faulty loop switches existing in the safety loop (including loop switches with artificial fault settings and loop switches with non-artificial fault settings). This signal is connected to the ground terminal through the solid-state relay S3 and the resistor R18. A display module is set in the system. The signal at the R18 terminal is fed back to the display module. The output signal of the operational amplifier U2 is synchronously fed back to the display module. The signal at the C1 terminal of the capacitor is synchronously fed back to the display module. When the display module obtains the signal at the R18 terminal, it displays the number of faulty loop switches in the current safety loop based on the amplitude of this signal. When the display module obtains the signal at the C1 terminal of the capacitor, it displays the total number of loop switches in the current safety loop based on the amplitude of this signal. When the display module obtains the output signal of the operational amplifier U2, it displays the number of loop switches that can be normally transmitted in the current safety loop based on the amplitude of this signal.

[0025] Refer to Figure 1, the 5-pin signal of trigger U4 is synchronously fed back to the gate of field effect tube Q4, and the 5-pin signal of trigger U4 is connected to the ground terminal through resistors R12 and R13. When IN5 obtains a setting completion signal, the 5-pin terminal of trigger U4 is high level, and the signal of capacitor C2 rises. When the total number of loop switches in the safety loop is increased or decreased, the amplitude of the signal at the output of op amp U2 is changed accordingly. When the total number of loop switches in the safety loop is increased or decreased, all loop switches set for artificial faults in the safety loop need to be released. After the increase or decrease of the total number of loop switches is completed, the operator or the terminal needs to feedback the setting completion signal twice. When trigger U4 obtains the first setting completion signal after the total number of loop switches is increased or decreased, the solid-state relay S2 is closed, the solid-state relay S3 is disconnected, the 5-pin terminal of trigger U4 is low level, the voltage difference between the gate of field effect tube Q4 and the source of field effect tube Q4 is lower than the conduction threshold, and the field effect tube Q4 is turned on. , the potential at the capacitor C2 end decreases, and at the same time, the signal at the capacitor C2 end passes through the source of the field effect tube Q4, the drain of the field effect tube Q4, and the resistor R16 to the ground end. The signal at the resistor R16 end is fed back to the in-phase end of the operational amplifier U9, and the power supply signal passes through the resistor R15 and the resistor R14 to the ground end. The signal at the resistor R14 end is fed back to the inverting end of the operational amplifier U9, and the operational amplifier U9 outputs. The signal at the output end of the operational amplifier U9 is fed back to the positive pole of the solid-state relay S1, and the solid-state relay S1 is closed, and the capacitor C1 end reaches the ground potential. When the signal at the capacitor C2 end is lower than the signal at the resistor R14 end, the operational amplifier U9 is cut off, the solid-state relay S1 is disconnected, and the amplitude of the signal at the capacitor C1 end rises to the amplitude of the signal at the output end of the operational amplifier U2. In this way, after the increase or decrease adjustment of the number of loop switches is completed, the calculation module re-records the total number of loop switches. When the trigger U4 obtains the second setting completion signal after the total number of loop switches is increased or decreased, the solid-state relay S2 is disconnected and the solid-state relay S3 is closed. At this time, the loop switch can be set for artificial faults.

[0026] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An elevator safety circuit detection training system, characterized in that: The method comprises a calculation module, wherein the calculation module comprises a plurality of operational amplifiers, a plurality of resistors, a solid-state relay, a capacitor, and a diode. An operational amplifier U2 among the plurality of operational amplifiers is connected with one end of a resistor R8 and an IN4 end in the same phase, with one end of a resistor R7 and an OUT2 end in the opposite phase, and with the other end of the resistor R7 and an OUT2 end in the output end; an operational amplifier U3 is connected with one end of a resistor R9 and the other end of the solid-state relay S2 in the same phase, with one end of a capacitor C1 and a cathode of a diode D1 in the opposite phase, and with the anode of the diode D1 in the output end; the other end of the resistor R8 is connected with an IN1-2 end; the other end of the capacitor C1, the other end of the resistor R9, and the negative pole of the solid-state relay S2 are grounded.

2. The elevator safety circuit detection training system according to claim 1 is characterized in that: The calculation module also includes a plurality of operational amplifiers, a plurality of resistors, a solid-state relay, and a trigger. The operational amplifier U6 among the plurality of operational amplifiers is connected to one end of the resistor R10 and one end of the resistor R19 in the same phase, is connected to one end of the resistor R11 and one end of the resistor R17 in the opposite phase, and its output is connected to the other end of the resistor R11 and one end of the solid-state relay S3; the operational amplifier U7 is connected to the cathode of the diode D1 in the same phase, and its output is connected to the other end of the resistor R10 in the opposite phase; the operational amplifier U8 is connected to the output end of the operational amplifier U2 in the same phase, and its output is connected to the other end of the resistor R17 in the opposite phase; the first pin and the fourth pin of the trigger U4 are connected to the power supply, the second pin is connected to the sixth pin, and the third pin is connected to the IN5 terminal; the other end of the solid-state relay S3 is connected to one end of the resistor R18; the other end of the resistor R18, the other end of the resistor R19, and the negative pole of the solid-state relay S3 are grounded.

3. The elevator safety circuit detection training system according to claim 2 is characterized in that: The calculation module also includes a field effect tube, a capacitor, an operational amplifier, a solid-state relay, an inverter, and several resistors. The operational amplifier U9 among the several operational amplifiers is connected to one end of the resistor R16 and the drain of the field effect tube Q4 in the same phase, and is connected to one end of the resistor R14 and one end of the resistor R15 in the opposite phase, and the output end is connected to the positive pole of the solid-state relay S1; the input end of the inverter U5 is connected to the fifth pin of the trigger U4, the gate of the field effect tube Q4, one end of the resistor R12, and the positive pole of the solid-state relay S3, and the output end is connected to the positive pole of the solid-state relay S2; the source of the field effect tube Q4 is connected to the other end of the resistor R12, one end of the resistor R13, and one end of the capacitor C2; one end of the solid-state relay S1 is connected to the inverting end of the operational amplifier U3; the other end of the capacitor C2, the other end of the resistor R13, the other end of the resistor R14, the other end of the resistor R16, the other end of the solid-state relay S1, and the negative pole of the solid-state relay S1 are grounded.

4. The elevator safety circuit detection training system according to claim 1 is characterized in that: It also includes a feedback module, which includes a plurality of resistors and operational amplifiers. The operational amplifier U1 among the plurality of operational amplifiers is connected to one end of the resistor R6 and the IN2 terminal in the same phase, and is connected to one end of the resistor R4 and one end of the resistor R5 in the opposite phase; the other end of the resistor R5 is connected to the power supply; the other end of the resistor R4 and the other end of the resistor R6 are grounded.

5. The elevator safety circuit detection training system according to claim 4 is characterized in that: The feedback module also includes a plurality of field effect tubes and a plurality of resistors. The source of the field effect tube Q1 among the plurality of field effect tubes is connected to the OUT1 terminal, the drain is connected to one end of the resistor R2, and the gate is connected to the gate of the field effect tube Q2, the gate of the field effect tube Q3, and the output end of the operational amplifier U1; the drain of the field effect tube Q2 is connected to the IN1-1 terminal, and the source is connected to the other end of the resistor R2; the drain of the field effect tube Q3 is connected to the IN3 terminal, and the source is connected to one end of the resistor R1; and the other end of the resistor R1 is grounded.

6. The elevator safety circuit detection training system according to claim 5 is characterized in that: The feedback module further includes a resistor, one end of the resistor R3 is connected to the gate of the field effect transistor Q1, and the other end is grounded.

7. The elevator safety circuit detection training system according to claim 1 is characterized in that: It also includes a display module, which is connected to the calculation module. The display module displays the quantity status of the loop switches in the safety loop based on the signal fed back by the calculation module.

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