Safety detection circuit, PCB and safety detection system of escalator

Abstract

The utility model discloses a safety detection circuit, a PCB and a safety detection system of an escalator, and the circuit comprises a safety controller SPLC, a step speed detection unit, a hand strap speed detection unit, a step missing detection unit, a brake state detection unit and a trigger unit, the output end of the step speed detection unit, the output end of the hand strap speed detection unit, the output end of the step missing detection unit and the output end of the brake state detection unit are connected with the input end of the safety controller SPLC, and the control end of the safety controller SPLC is connected with the input end of the trigger unit. The output end of the trigger unit is used for being connected with a safety chain loop of the escalator and a brake of the escalator, and the output end of the safety controller SPLC is used for being connected with a control system of the escalator. According to the circuit disclosed by the invention, detection of multiple safety functions related to the operation process of the escalator can be realized, and the circuit has the advantages of high detection comprehensiveness, high detection accuracy and high detection flexibility.

Description

Technical Field

[0001] The safety detection of the present utility model relates to the technical field, and particularly relates to a safety detection circuit, a PCB board and a safety detection system for an escalator. Background Art

[0002] With the rapid development of elevator technology, the application of programmable electronic technology in escalators has become a development trend. As a result, there is a need for the development of relevant safety monitoring technologies. Its application is an advanced method to ensure and improve the safety performance of escalators, mainly regarding the requirements of programmable electronic monitoring systems related to safety, safety functions and safety integrity levels, as well as technologies and measures for implementing and verifying SL compliance.

[0003] Existing common programmable electronic safety monitoring devices applied to escalators are all developed and designed in accordance with the requirements in the current national standard GB16899-2011 "Safety Rules for the Construction and Installation of Escalators and Moving Walks" to meet the corresponding safety function monitoring.

[0004] It can be seen that the existing technology still needs to be improved. Content of the Utility Model

[0005] In view of the deficiencies of the above-mentioned existing technology, the purpose of the present utility model is to provide a safety detection circuit for an escalator, which can realize the detection of multiple safety functions related to the operation process of the escalator, and has the advantages of high detection comprehensiveness, high detection accuracy and high detection flexibility.

[0006] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0007] A safety detection circuit for an escalator includes a safety controller SPLC, a step speed detection unit, a handrail belt speed detection unit, a step missing detection unit, a brake state detection unit and a trigger unit. The output ends of the step speed detection unit, the handrail belt speed detection unit, the step missing detection unit and the brake state detection unit are respectively connected to the input end of the safety controller SPLC. The control end of the safety controller SPLC is connected to the input end of the trigger unit. The output end of the trigger unit is respectively used to connect the safety chain circuit of the escalator and the brake of the escalator. The output end of the safety controller SPLC is used to connect the control system of the escalator.

[0008] In the safety detection circuit of the escalator described above, the step speed detection unit includes a first photoelectric sensor S1 and a second photoelectric sensor S2. The positive terminals of the first photoelectric sensor S1 and the second photoelectric sensor S2 are respectively connected to the pin V1 of the safety controller SPLC. The output terminal of the first photoelectric sensor S1 is connected to the pin S10 of the safety controller SPLC. The output terminal of the second photoelectric sensor S2 is connected to the pin S11 of the safety controller SPLC. The negative terminals of the first photoelectric sensor S1 and the second photoelectric sensor S2 are respectively grounded.

[0009] In the safety detection circuit of the escalator described above, the handrail belt speed detection unit includes a first speed sensor S3 and a second speed sensor S4. The positive terminals of the first speed sensor S3 and the second speed sensor S4 are respectively connected to the pin V1 of the safety controller SPLC. The output terminal of the first speed sensor S3 is connected to the pin S12 of the safety controller SPLC. The output terminal of the second speed sensor S4 is connected to the pin S13 of the safety controller SPLC. The negative terminals of the first speed sensor S3 and the second speed sensor S4 are respectively grounded.

[0010] In the safety detection circuit of the escalator described above, the step missing detection unit includes a first photoelectric switch S5 and a second photoelectric switch S6. The positive terminals of the first photoelectric switch S5 and the second photoelectric switch S6 are respectively connected to the pin V1 of the safety controller SPLC. The output terminal of the first photoelectric switch S5 is connected to the pin S14 of the safety controller SPLC. The output terminal of the second photoelectric switch S6 is connected to the pin S15 of the safety controller SPLC. The negative terminals of the first photoelectric switch S5 and the second photoelectric switch S6 are respectively grounded.

[0011] In the safety detection circuit of the escalator described above, the brake state detection unit includes a first travel limit switch SW1, a second travel limit switch SW2, and a third travel limit switch EB. One end of the first travel limit switch SW1, one end of the second travel limit switch SW2, and one end of the third travel limit switch EB are respectively connected to the pin T3 of the safety controller SPLC. The other end of the first travel limit switch SW1 is connected to the pin S16 of the safety controller SPLC. The other end of the second travel limit switch SW2 is connected to the pin S17 of the safety controller SPLC. The other end of the third travel limit switch EB is connected to the pin S18 of the safety controller SPLC.

[0012] In the safety detection circuit of the escalator described above, the trigger unit includes a first relay K1, a second relay K2, a third relay K3, and a fourth relay K4. One end of the normally closed contact of the second relay K2 is connected to the pin S115 of the safety controller SPLC, and the other end of the normally closed contact of the second relay K2 is connected to one end of the normally closed contact of the first relay K1. The other end of the normally closed contact of the first relay K1 is connected to the pin T4 of the safety controller SPLC. The coils of the first relay K1 and the second relay K2 are respectively connected to the pins So0 and So1 of the safety controller SPLC. The normally open contacts of the first relay K1 and the second relay K2 are respectively used to connect the safety chain circuit of the escalator. One end of the normally closed contact of the fourth relay K4 is connected to the pin S116 of the safety controller SPLC, and the other end of the normally closed contact of the fourth relay K4 is connected to one end of the normally closed contact of the third relay K3. The other end of the normally closed contact of the third relay K3 is connected to the pin T4 of the safety controller SPLC. The coils of the third relay K3 and the fourth relay K4 are respectively connected to the pins So2 and So3 of the safety controller SPLC. The normally open contacts of the third relay K3 and the fourth relay K4 are respectively used to connect the brakes of the escalator.

[0013] In the safety detection circuit of the escalator described above, the pins V1 and V2 of the safety controller SPLC are respectively used to connect an external power supply device, and the pins So4, So5, So6, and So7 of the safety controller SPLC are respectively used to connect the controller of the escalator. The pin S112 of the safety controller SPLC is used to receive the operation signal of the escalator, the pin S113 of the safety controller SPLC is used to receive the upward signal of the escalator, and the pin S114 of the safety controller SPLC is used to receive the downward signal of the escalator.

[0014] In the safety detection circuit of the escalator described above, it further includes a reset switch RST and a changeover switch SMS. One end of the reset switch RST is connected to the pin S16 of the safety controller SPLC, and the other end of the reset switch RST and the pin 1 of the changeover switch SMS are respectively connected to the pin T2 of the safety controller SPLC. The pins 2 and 4 of the changeover switch SMS are respectively connected to the pins S110 and S111 of the safety controller SPLC, and the pin 3 of the changeover switch SMS is connected to the pin T1 of the safety controller SPLC.

[0015] The present application also correspondingly discloses a PCB board, on which is printed the safety detection circuit of the escalator as described in any one of the above.

[0016] The present application also correspondingly provides a safety detection system for an escalator. The safety detection system includes a detection device, a control system, and a power supply device. The detection device uses the safety detection circuit of the escalator as described in any one of the above to achieve work control. The power supply end of the detection device is connected to the output end of the power supply device, and the output end of the detection device is connected to the input end of the control system.

[0017] Beneficial effects:

[0018] The present utility model provides a safety detection circuit for an escalator, which can realize the detection of multiple safety functions related to the operation process of the escalator, and has the advantages of high detection comprehensiveness, high detection accuracy, and high detection flexibility. By cooperating with the safety detection circuit, the stability and safety of the escalator during operation are improved, and the market competitiveness of the escalator is enhanced. Description of the drawings

[0019] Figure 1 It is a circuit block diagram of the safety detection circuit provided by the present utility model;

[0020] Figure 2 It is a circuit schematic diagram of the safety detection circuit provided by the present utility model.

[0021] Description of the main component symbols: 1 - Safety controller SPLC, 2 - Step speed detection unit, 3 - Handrail belt speed detection unit, 4 - Step missing detection unit, 5 - Brake state detection unit, 6 - Trigger unit. Detailed implementation manners

[0022] The present utility model provides a safety detection circuit, a PCB board, and a safety detection system for an escalator. To make the purpose, technical solution, and effects of the present utility model clearer and more definite, the following examples are given with reference to the drawings to further elaborate on the present utility model in detail.

[0023] In the description of the present utility model, it should be understood that terms such as "installation" and "connection" should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Please refer to Figure 1 and Figure 2, the present utility model provides a safety detection circuit for an escalator, including a safety controller SPLC1, a step speed detection unit 2, a handrail belt speed detection unit 3, a step missing detection unit 4, a brake state detection unit 5, and a trigger unit 6. The output ends of the step speed detection unit 2, the handrail belt speed detection unit 3, the step missing detection unit 4, and the brake state detection unit 5 are respectively connected to the input end of the safety controller SPLC1. The control end of the safety controller SPLC1 is connected to the input end of the trigger unit 6. The output end of the trigger unit 6 is respectively used to connect the safety chain loop of the escalator and the brake of the escalator. The output end of the safety controller SPLC1 is used to connect the control system of the escalator.

[0025] This application discloses a safety detection circuit for an escalator, which can realize the detection of multiple safety functions related to the operation process of the escalator, and has the advantages of high detection comprehensiveness, high detection accuracy, and high detection flexibility. By cooperating with the safety detection circuit, the stability and safety of the escalator during operation are improved, and the market competitiveness of the escalator is enhanced.

[0026] In this embodiment, the model of the safety controller SPLC1 is G9SP-N20S. The safety controller SPLC1 is used to realize the detection of multiple safety functions related to the escalator, and to monitor in real time and output the safety state of the escalator to the control system of the escalator.

[0027] Further, please refer to Figure 1 , the step speed detection unit 2 includes a first photoelectric sensor S1 and a second photoelectric sensor S2. The positive terminals of the first photoelectric sensor S1 and the second photoelectric sensor S2 are respectively connected to the pin V1 of the safety controller SPLC1. The output end of the first photoelectric sensor S1 is connected to the pin S10 of the safety controller SPLC1. The output end of the second photoelectric sensor S2 is connected to the pin S11 of the safety controller SPLC1. The negative terminals of the first photoelectric sensor S1 and the second photoelectric sensor S2 are respectively grounded.

[0028] In this embodiment, the models of the first optoelectronic sensor S1 and the second optoelectronic sensor S2 can be XECRO IPS18-N8PO79-A12 or XECRO IPS18-S8PO79-A12; the step speed detection sensor is used to detect the overspeed, non-operational reverse and out-of-stop-distance of the steps or pallets; specifically, the detection of the overspeed of the steps or pallets means that the escalator and the moving walk automatically stop running before the speed exceeds 1.2 times the nominal speed, and the additional brake is actuated to prevent starting; the non-operational reverse detection means that the escalator and the inclined moving walk with α≥6° are provided with a non-manipulative reverse detection device for the running direction, so that it automatically stops running when the steps, pallets or tapes change the specified running direction to prevent starting; the out-of-stop-distance detection means that if the stop distance exceeds 20% of the maximum allowable stop distance specified in EN115-1:2017, the escalator and the moving walk can only be restarted after the fault lock is reset.

[0029] Further, please refer to Figure 1 , the handrail speed detection unit 3 includes a first speed measurement sensor S3 and a second speed measurement sensor S4. The positive terminals of the first speed measurement sensor S3 and the second speed measurement sensor S4 are respectively connected to the pin V1 of the safety controller SPLC1. The output terminal of the first speed measurement sensor S3 is connected to the pin S12 of the safety controller SPLC1. The output terminal of the second speed measurement sensor S4 is connected to the pin S13 of the safety controller SPLC1. The negative terminals of the first speed measurement sensor S3 and the second speed measurement sensor S4 are respectively grounded.

[0030] In this embodiment, the models of the first speed measurement sensor S3 and the second speed measurement sensor S4 can be XECRO IPS12-N4PO50-A12 or XECRO IPS12-N8PO68-A12; the handrail speed detection unit 3 is used to detect the deviation of the left and right handrail speeds. Specifically, when the escalator and the moving walk are running, when the handrail speed deviates from the actual speed of the steps, pallets or tapes by more than +15% / -15% and the duration is between 5 s and 15 s, the escalator or the moving walk stops running.

[0031] Further, please refer to Figure 1, the step missing detection unit 4 includes a first photoelectric switch S5 and a second photoelectric switch S6. The positive terminals of the first photoelectric switch S5 and the second photoelectric switch S6 are respectively connected to the pin V1 of the safety controller SPLC1. The output terminal of the first photoelectric switch S5 is connected to the pin S14 of the safety controller SPLC1. The output terminal of the second photoelectric switch S6 is connected to the pin S15 of the safety controller SPLC1. The negative terminals of the first photoelectric switch S5 and the second photoelectric switch S6 are respectively grounded.

[0032] In this embodiment, the models of the first photoelectric switch S5 and the second photoelectric switch S6 can be XECRO IPS18-N20PO53-A12 or XECRO IPS30-S22PO79-A12. The step missing detection unit 4 is used to detect the missing steps or treads. Specifically, escalators and moving walks detect the missing steps or treads through devices installed at the drive station and the turning station, and stop before the gap appears at the comb plate position. The gap is caused by the missing steps or treads.

[0033] Further, please refer to Figure 1 , the brake state detection unit 5 includes a first travel limit switch SW1, a second travel limit switch SW2, and a third travel limit switch EB. One end of the first travel limit switch SW1, one end of the second travel limit switch SW2, and one end of the third travel limit switch EB are respectively connected to the pin T3 of the safety controller SPLC1. The other end of the first travel limit switch SW1 is connected to the pin S16 of the safety controller SPLC1. The other end of the second travel limit switch SW2 is connected to the pin S17 of the safety controller SPLC1. The other end of the third travel limit switch EB is connected to the pin S18 of the safety controller SPLC1.

[0034] In this embodiment, the models of the first travel limit switch SW1 and the second travel limit switch SW2 can be PIZZATO FR501-M2 or SCHMERSAL ZS236-02Z. The first travel limit switch SW1 and the second travel limit switch SW2 are the state detection switches of the working brake. The model of the third travel limit switch EB can be PIZZATO FR501-M2 or SCHMERSAL ZS 236-02Z. The third travel limit switch EB is the state detection switch of the additional brake.

[0035] In this embodiment, the first travel limit switch SW1 and the second travel limit switch SW2 are used to detect the status of the working brake and the timeout of the electric brake. Specifically, if the total time from the start of the electric brake timing to the actuation of the working brake exceeds 4 s, the escalator or moving walk shall automatically stop running and the additional brake shall be actuated; when the escalator and moving walk are started, if the working brake is not released, the escalator or moving walk shall automatically stop running.

[0036] In this embodiment, the third travel limit switch EB is used to detect the status of the additional brake. Specifically, when the escalator and moving walk are started, if the additional brake is not released, the escalator or moving walk shall automatically stop running.

[0037] Further, please refer to Figure 1 , the trigger unit 6 includes a first relay K1, a second relay K2, a third relay K3, and a fourth relay K4. One end of the normally closed contact of the second relay K2 is connected to the pin S115 of the safety controller SPLC1, and the other end of the normally closed contact of the second relay K2 is connected to one end of the normally closed contact of the first relay K1. The other end of the normally closed contact of the first relay K1 is connected to the pin T4 of the safety controller SPLC1. The coils of the first relay K1 and the second relay K2 are respectively connected to the pins So0 and So1 of the safety controller SPLC1 in correspondence. The normally open contacts of the first relay K1 and the second relay K2 are respectively used to connect the safety chain circuit of the escalator; one end of the normally closed contact of the fourth relay K4 is connected to the pin S116 of the safety controller SPLC1, and the other end of the normally closed contact of the fourth relay K4 is connected to one end of the normally closed contact of the third relay K3. The other end of the normally closed contact of the third relay K3 is connected to the pin T4 of the safety controller SPLC1. The coils of the third relay K3 and the fourth relay K4 are respectively connected to the pins So2 and So3 of the safety controller SPLC1 in correspondence. The normally open contacts of the third relay K3 and the fourth relay K4 are respectively used to connect the brake of the escalator.

[0038] In this embodiment, the models of the first relay K1, the second relay K2, the third relay K3, and the fourth relay K4 can be OMRON G7SA-3A1B; the trigger unit 6 is used to output the status of the safety function action protection.

[0039] Further, please refer to Figure 1The pins V1 and V2 of the safety controller SPLC1 are respectively used to connect to an external power supply device, and the pins So4, So5, So6, and So7 of the safety controller SPLC1 are respectively used to connect to the controller of the escalator; the pin S112 of the safety controller SPLC1 is used to receive the operation signal of the escalator, the pin S113 of the safety controller SPLC1 is used to receive the upward signal of the escalator, and the pin S114 of the safety controller SPLC1 is used to receive the downward signal of the escalator.

[0040] In this embodiment, the external power supply device provides a 24V DC working voltage, and the external power supply device is a 24V switching power supply shared with the control system of the escalator; the operation signal, upward signal, and downward signal are taken from the PLC output points for controlling the operation, upward movement, and downward movement of the escalator inverter.

[0041] Further, please refer to Figure 1 The safety detection circuit further includes a reset switch RST and a changeover switch SMS. One end of the reset switch RST is connected to the pin S16 of the safety controller SPLC1, the other end of the reset switch RST and the pin 1 of the changeover switch SMS are respectively connected to the pin T2 of the safety controller SPLC1, the pin 2 and pin 4 of the changeover switch SMS are respectively connected to the pins S110 and S111 of the safety controller SPLC1 in correspondence, and the pin 3 of the changeover switch SMS is connected to the pin T1 of the safety controller SPLC1.

[0042] In this embodiment, the reset switch RST is used to implement the fault reset function, and the changeover switch SMS is used to implement the switching between the automatic operation mode and the maintenance mode.

[0043] This application also correspondingly discloses a PCB board, on which is printed the safety detection circuit of the escalator as described in any one of the above.

[0044] This application also correspondingly provides a safety detection system for an escalator. The safety detection system includes a detection device, a control system, and a power supply device. The detection device uses the safety detection circuit of the escalator as described in any one of the above to implement work control. The power supply end of the detection device is connected to the output end of the power supply device, and the output end of the detection device is connected to the input end of the control system.

[0045] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solutions and the inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A safety detection circuit for an escalator, characterized in that: It includes a safety controller SPLC, a step speed detection unit, a handrail speed detection unit, a step missing detection unit, a brake state detection unit and a trigger unit, wherein the output ends of the step speed detection unit, the handrail speed detection unit, the step missing detection unit and the brake state detection unit are respectively connected to the input end of the safety controller SPLC, the control end of the safety controller SPLC is connected to the input end of the trigger unit, the output end of the trigger unit is respectively used to connect the safety chain loop of the escalator and the brake of the escalator, and the output end of the safety controller SPLC is used to connect the control system of the escalator.

2. The safety detection circuit of an escalator according to claim 1, characterized in that: The step speed detection unit includes a first photoelectric sensor S1 and a second photoelectric sensor S2, the positive end of the first photoelectric sensor S1 and the positive end of the second photoelectric sensor S2 are respectively connected to the pin V1 of the safety controller SPLC, the output end of the first photoelectric sensor S1 is connected to the pin S10 of the safety controller SPLC, the output end of the second photoelectric sensor S2 is connected to the pin S11 of the safety controller SPLC, and the negative end of the first photoelectric sensor S1 and the negative end of the second photoelectric sensor S2 are respectively grounded.

3. The safety detection circuit of an escalator according to claim 1, characterized in that: The handrail speed detection unit includes a first speed sensor S3 and a second speed sensor S4, the positive end of the first speed sensor S3 and the positive end of the second speed sensor S4 are respectively connected to the pin V1 of the safety controller SPLC, the output end of the first speed sensor S3 is connected to the pin S12 of the safety controller SPLC, the output end of the second speed sensor S4 is connected to the pin S13 of the safety controller SPLC, and the negative end of the first speed sensor S3 and the negative end of the second speed sensor S4 are respectively grounded.

4. The safety detection circuit of an escalator according to claim 1, characterized in that: The step missing detection unit includes a first photoelectric switch S5 and a second photoelectric switch S6, the positive end of the first photoelectric switch S5 and the positive end of the second photoelectric switch S6 are respectively connected to the pin V1 of the safety controller SPLC, the output end of the first photoelectric switch S5 is connected to the pin S14 of the safety controller SPLC, the output end of the second photoelectric switch S6 is connected to the pin S15 of the safety controller SPLC, and the negative end of the first photoelectric switch S5 and the negative end of the second photoelectric switch S6 are respectively grounded.

5. The safety detection circuit of an escalator according to claim 1, characterized in that: The brake state detection unit includes a first stroke limit switch SW1, a second stroke limit switch SW2 and a third stroke limit switch EB, one end of the first stroke limit switch SW1, one end of the second stroke limit switch SW2 and one end of the third stroke limit switch EB are respectively connected to pin T3 of the safety controller SPLC, the other end of the first stroke limit switch SW1 is connected to pin S16 of the safety controller SPLC, the other end of the second stroke limit switch SW2 is connected to pin S17 of the safety controller SPLC, and the other end of the third stroke limit switch EB is connected to pin S18 of the safety controller SPLC.

6. The safety detection circuit of an escalator according to claim 1, characterized in that: The trigger unit includes a first relay K1, a second relay K2, a third relay K3 and a fourth relay K4, one end of the normally closed contact of the second relay K2 is connected to the pin S115 of the safety controller SPLC, the other end of the normally closed contact of the second relay K2 is connected to one end of the normally closed contact of the first relay K1, the other end of the normally closed contact of the first relay K1 is connected to the pin T4 of the safety controller SPLC, the coil of the first relay K1 and the coil of the second relay K2 are respectively connected to the pin So0 and the pin So1 of the safety controller SPLC, the normally open contact of the first relay K1 and the normally closed contact of the second relay K2 are respectively connected to the pin So0 and the pin So1 of the safety controller SPLC, and the normally open contact of the first relay K1 and the normally closed contact of the second relay K2 are respectively connected to the pin So1 of the safety controller SPLC. The normally open contacts are respectively used to connect the safety chain loop of the escalator; one end of the normally closed contact of the fourth relay K4 is connected to the pin S116 of the safety controller SPLC, the other end of the normally closed contact of the fourth relay K4 is connected to one end of the normally closed contact of the third relay K3, the other end of the normally closed contact of the third relay K3 is connected to the pin T4 of the safety controller SPLC, the coil of the third relay K3 and the coil of the fourth relay K4 are respectively connected to the pin So2 and the pin So3 of the safety controller SPLC, the normally open contact of the third relay K3 and the normally open contact of the fourth relay K4 are respectively used to connect the brake of the escalator.

7. The safety detection circuit of an escalator according to claim 1, characterized in that: Pin V1 and pin V2 of the safety controller SPLC are respectively used to connect to an external power supply device, and pin So4, pin So5, pin So6 and pin So7 of the safety controller SPLC are respectively used to connect to the controller of the escalator; pin S112 of the safety controller SPLC is used to receive the operation signal of the escalator, pin S113 of the safety controller SPLC is used to receive the up signal of the escalator, and pin S114 of the safety controller SPLC is used to receive the down signal of the escalator.

8. The safety detection circuit of an escalator according to claim 1, characterized in that: It also includes a reset switch RST and a switching switch SMS, one end of the reset switch RST is connected to pin S16 of the safety controller SPLC, the other end of the reset switch RST and pin 1 of the switching switch SMS are respectively connected to pin T2 of the safety controller SPLC, pin 2 and pin 4 of the switching switch SMS are respectively connected to pin S110 and pin S111 of the safety controller SPLC, and pin 3 of the switching switch SMS is connected to pin T1 of the safety controller SPLC.

9. A PCB board, characterized in that: The PCB board is printed with the safety detection circuit of the escalator as described in any one of claims 1 to 8.

10. An escalator safety detection system, characterized in that: The safety detection system includes a detection device, a control system and a power supply device. The detection device adopts the safety detection circuit of the escalator as described in any one of claims 1 to 8 to realize working control. The power supply end of the detection device is connected to the output end of the power supply device, and the output end of the detection device is connected to the input end of the control system.

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