Elevator safety door lock switching signal and resistance detection method

Abstract

The invention discloses an elevator safety door lock opening and closing signal and resistance detection method which is realized on the basis of an elevator safety door lock opening and closing signal and resistance detection system. The elevator safety door lock switch signal and resistance detection system comprises a safety loop module, a detection circuit module, a control type power supply module, a loop detection module and a control module, the safety loop module comprises N safety door lock switches, the number of the safety door lock switches is N, all the safety door lock switches are connected in series to form the safety loop module, the high-voltage end of the safety loop module is connected to a 110V high-voltage direct-current power supply, and the low-voltage end of the safety loop module is grounded through a And numbering each safety door lock switch in sequence from the high-voltage end of the safety circuit module to the low-voltage end of the safety circuit module. According to the elevator safety door lock switching signal and resistance detection method, the problem that in the prior art, elevator cars need to stop on all floors one by one, and a large amount of time needs to be consumed is solved.

Description

Technical Field

[0001] The invention relates to the field of elevator safety door lock switch detection, and in particular to an elevator safety door lock switch signal and resistance detection method. Background Art

[0002] In the elevator system, a safety door lock switch is installed for each floor door. The door lock switch is disconnected when the floor door is opened, and the safety door lock switch is closed when the floor door is closed. All safety door lock switches are connected in series to form an elevator safety circuit. The high-voltage end of the elevator safety circuit is connected to a 110V DC voltage, and the low-voltage end of the elevator safety circuit is grounded through a load. The input end of the elevator control box is connected to the low-voltage end of the elevator safety circuit. By detecting whether there is voltage at the low-voltage end of the elevator safety circuit, it is determined whether all floor doors are closed normally. Because under normal conditions, in order to ensure that the floor door is in a closed state when the elevator car does not run to the floor door, all safety door lock switches in the closed elevator safety circuit corresponding to the floor door are generally in a closed state. It can be determined whether all floor doors are closed normally by detecting whether there is voltage at the low-voltage end of the elevator safety circuit. However, sometimes when the floor door cannot be closed, the maintenance personnel will use the method of short-circuiting the safety door lock switch to ensure that there is voltage at the low-voltage end of the elevator safety circuit, that is, when the floor door is damaged, there is voltage output at the low-voltage end of the elevator safety circuit, thereby ensuring the normal operation of the elevator and rescue personnel. There may be a situation where the safety door lock switch is forgotten to cancel the short circuit, resulting in the inability to detect whether the floor door is normally closed or open, causing a safety accident.

[0003] The Chinese patent discloses a detection circuit and a detection method for a short circuit of an elevator door lock circuit with an application number of CN201611226380.6. The detection circuit and method for a short circuit of an elevator door lock circuit, wherein several layers of door lock safety contacts are connected in series and their first ends are connected to a voltage to form a first node, and the second ends are connected to the car door lock safety contacts to form a second node, and the other ends of the car door lock safety contacts form a third node. When the elevator reaches the leveling position of the destination floor and the door is opened, the present invention detects whether there is a voltage signal at the third node, if so, outputs a short circuit signal and performs fault processing, otherwise, detects whether there is a voltage signal at the second node, if so, outputs a short circuit signal and performs fault processing, otherwise, determines whether the elevator is located at the door area position, if so, connects the first node and the third node and detects whether there is a voltage signal at the second node, if so, outputs a short circuit signal and performs fault processing.

[0004] Although the above-mentioned elevator door lock circuit short-circuit detection circuit and detection method can detect which floor door switch is short-circuited, there are still disadvantages: during the detection, the elevator needs to be running. After the elevator car runs to each floor and the corresponding floor door switch is opened, it is judged whether it is short-circuited by detecting whether there is voltage at the second node. It takes a lot of time for the elevator car to stop at each floor one by one, resulting in a very long detection time. Summary of the invention

[0005] The present invention provides a method for detecting switch signals and resistance of an elevator safety door lock, so as to solve the problem in the prior art that the elevator car needs to stop at each floor one by one, which takes a lot of time.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention discloses a method for detecting a switch signal and resistance of an elevator safety door lock. The method is implemented based on a switch signal and resistance detection system for an elevator safety door lock. The switch signal and resistance detection system for an elevator safety door lock comprises a safety circuit module, a detection circuit module, a controlled power supply module, a circuit detection module and a control module. The safety circuit module comprises a safety door lock switch. There are N safety door lock switches. All safety door lock switches are connected in series to form a safety circuit module. The high-voltage end of the safety circuit module is connected to a high-voltage DC power supply 110V, and the low-voltage end of the safety circuit module is grounded through a load. Each safety door lock switch is numbered in sequence from the high-voltage end of the safety circuit module to the low-voltage end of the safety circuit module. The safety door lock switch closest to the high-voltage end of the safety circuit module is an odd number. The safety door lock switch corresponding to each even number is an odd number. The door lock switch is provided with a detection circuit module, which includes: a switching switch and a detection execution circuit, wherein the first switching end of the switching switch is connected to the high voltage end of each even-numbered safety door lock switch, the second switching end of the switching switch is connected to the low voltage end of each even-numbered safety door lock switch, the fixed end of the switching switch is connected to the input end of the detection execution circuit, and the output end of the detection execution circuit is connected to the first input end of the control module; the high voltage end of the load is connected to the input end of the loop detection module, and the output end of the loop detection module is connected to the second input end of the control module; the switching switch is powered by a controlled power supply module, the control end of the controlled power supply module is connected to the output end of the control module, and the control module switches the connection between the fixed end and the first switching end, or switches the connection between the fixed end and the second switching end by controlling whether the controlled power supply module supplies power to the switching switch. The elevator safety door lock switch signal and resistance detection method includes the following steps: S1, obtaining the load high voltage end voltage as X1 through the loop detection module; S2, obtaining the high voltage end voltage value of all even-numbered safety door lock switches and the low voltage end voltage value of even-numbered safety door lock switches by controlling the switching switch, and judging whether there is a short circuit phenomenon of the safety door lock switch.

[0008] Preferably, step S2 comprises the following steps:

[0009] S21, calculate the safety circuit module current I, I = X1 / R3, R3 is the resistance value of the load;

[0010] S22, calculate the resistance value between the high-voltage ends of two adjacent even-numbered safety door lock switches to determine whether there is a short circuit between the high-voltage ends of the two adjacent even-numbered safety door lock switches, including the following steps: S221, the control module controls whether the controlled power supply module supplies power to the switching switch to achieve the connection between the fixed end and the first switching end; S222, obtain the voltage value of the high-voltage end of each even-numbered safety door lock switch through the detection circuit module, and set the voltage value of the high-voltage end of the even-numbered safety door lock switch i to X i ; S223, according to the calculated resistance value between the high-voltage ends of two adjacent even-numbered safety door lock switches, determine whether there is an abnormal resistance value between the high-voltage ends of two adjacent even-numbered safety door lock switches. If yes, find out the two adjacent even-numbered safety door lock switches with abnormal resistance values, mark the abnormal two adjacent even-numbered safety door lock switches, and perform step S23 at the same time; if no, then the command output result is: no short circuit of the rear safety door lock switch, and perform step S24;

[0011] S23, calculate the resistance values ​​of all safety door lock switches, find out which of the two even-numbered safety door lock switches adjacent to each other is abnormal, and output the result as follows: safety door lock switch number M is abnormal;

[0012] S24, short circuit judgment is completed, and the short circuit judgment result is output.

[0013] Preferably, step S223 includes the following steps:

[0014] S2231, suppose the resistance between the high voltage end of the even number i safety door lock switch and the high voltage end of the even number i+1 safety door lock switch is R i , R i =(X i -X i-1 ) / I;

[0015] S2232, calculate all R i Mean R0;

[0016] S2233, calculate and judge each R i Is it within the range (R0-△R, R0+△R), △R is the set value; if so, the command output result is: no rear safety door lock switch is not short-circuited, and then proceed to step S24; if not, then find out R iFor the abnormally adjacent even-numbered safety door lock switches that are not within the range (R0-△R, R0+△R), the values ​​of the Q sequence are equal to the serial numbers of the abnormally adjacent even-numbered safety door lock switches, and step S23 is performed.

[0017] Preferably, step S23 includes the following steps:

[0018] S231, the control module controls whether the controlled power supply module supplies power to the switch, thereby connecting the fixed end and the second switching end;

[0019] S232, obtain the voltage value of the low voltage end of each even-numbered safety door lock switch through the detection circuit module, and set the voltage value of the high voltage end of the even-numbered safety door lock switch i to be Y i ;

[0020] S233, according to X i and Y i Calculate the resistance value at each safety door lock switch, and determine whether the resistance value at each full door lock switch in the Q sequence is abnormal. If it is abnormal, determine that the corresponding safety door lock switch is short-circuited, and record the corresponding safety door lock switch serial number in the sequence M. The output result is: the safety door lock switch serial number M is abnormal, and proceed to step S24; if it is not abnormal, determine that the corresponding safety door lock switch is not short-circuited.

[0021] Preferably, in step S233, the resistance value at the safety door lock switch of sequence number j is set to Q j ;

[0022] Calculate the resistance value of all safety door lock switches to be Q j The average value q;

[0023] The basis for judging whether the resistance value at each full door lock switch in the Q sequence is abnormal is: judging whether the resistance value Qj at each full door lock switch in the Q sequence is within the range (q-△q, q+△q), where △q is the set value.

[0024] Preferably, each detection execution module includes: a photoelectric coupler U1, a resistor R1, a resistor R2, an amplifier U2 and a capacitor C1, the anode of the diode in the photoelectric coupler U1 is the input end of the detection control module, the cathode of the diode in the photoelectric coupler U1 is grounded through the resistor R1, the input end of the photoreceptor in the photoelectric coupler U1 is connected to a DC power supply 5v, the output end of the photoreceptor in the photoelectric coupler U1 is connected to the first end of the resistor R2 and the input end of the amplifier U2, the second end of the resistor R2 is grounded, the output end of the amplifier U2 is the output end of the detection control module, the output end of the amplifier U2 is connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In this application, first of all, the traditional thinking is broken, and the resistance value at each safety door lock switch is detected to determine whether it is short-circuited, thereby avoiding the phenomenon that the DC power supply 110v connected to the high-voltage end of the safety circuit module is unstable, which leads to misjudgment of whether it is short-circuited by only detecting the voltage change at both ends of the safety door lock switch. Since the resistance value at the safety door lock switch will not change due to the instability of the DC power supply 110v connected to the end, this method greatly improves the accuracy of detection. Then, in this application, in order to reduce the use of detection circuit modules and save costs, a controllable switching switch is used in this application to switch and connect the high-voltage end and the low-voltage end of the even-numbered safety door lock switch, thereby realizing the switching detection of the high-voltage end voltage value and the low-voltage end voltage value of the even-numbered safety door lock switch, which can reduce the use of almost half of the detection circuit modules, and also reduce the requirements for the number of first input terminals of the control module (because most elevator buildings have 30 floors, it is difficult to find a control module with 30 first input terminals, but it is easy to find a control module with 15 first input terminals, which can greatly reduce the cost of the control module, and the cost of the switching switch is also lower than that of the control module and the detection circuit module), reducing the cost of the control module. In this way, the accuracy of the fart short circuit judgment is improved by detecting the resistance value at the door lock switch, and the use of the detection circuit module is reduced by using the switching switch.

[0027] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the circuit diagram of the elevator safety door lock switch signal and resistance detection system when the number of all door lock switches is even.

[0029] Figure 2 This is the circuit diagram of the elevator safety door lock switch signal and resistance detection system when the number of all door lock switches is an odd number. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0031] like Figure 1 as well as Figure 2As shown, the present invention discloses an elevator safety door lock switch signal and resistance detection method, the elevator safety door lock switch signal and resistance detection method is implemented based on an elevator safety door lock switch signal and resistance detection system, the elevator safety door lock switch signal and resistance detection system comprises: a safety loop module, a detection circuit module, a controlled power supply module, a loop detection module and a control module, the safety loop module comprises: a safety door lock switch, there are N safety door lock switches, all safety door lock switches are connected in series to form a safety loop module, the high-voltage end of the safety loop module is connected to a high-voltage DC power supply 110V, and the low-voltage end of the safety loop module is grounded through a load R3; each safety door lock switch is numbered in sequence from the high-voltage end of the safety loop module to the low-voltage end of the safety loop module, and the safety door lock switch closest to the high-voltage end of the safety loop module (SW1, SW2, SW3, SW4, ..., SWN-1, SW N) is an odd number; a detection circuit module is provided corresponding to each even-numbered safety door lock switch, and the detection circuit module includes: a switching switch SWS and a detection execution circuit, the first switching end of the switching switch is connected to the high voltage end of each even-numbered safety door lock switch, the second switching end of the switching switch is connected to the low voltage end of each even-numbered safety door lock switch, the fixed end of the switching switch is connected to the input end of the detection execution circuit, and the output end of the detection execution circuit is connected to the first input end of the control module; the high voltage end of the load is connected to the input end of the loop detection module, and the output end of the loop detection module is connected to the second input end of the control module; the switching switch is powered by a controlled power supply module, the control end of the controlled power supply module is connected to the output end of the control module, and the control module switches the connection between the fixed end and the first switching end, or switches the connection between the fixed end and the second switching end by controlling whether the controlled power supply module supplies power to the switching switch. The elevator safety door lock switch signal and resistance detection method includes the following steps: S1, obtaining the load high voltage terminal voltage as X1 through the loop detection module; S2, obtaining the high voltage terminal voltage values ​​of all even-numbered safety door lock switches and the low voltage terminal voltage values ​​of even-numbered safety door lock switches by controlling the switching switch, and judging whether there is a short circuit phenomenon of the safety door lock switch. The switching switch can be a single-pole double-throw switch in the relay, and a relay with multiple single-pole double-throw switches can be selected to realize the switching of the fixed end before and after power supply to connect the first switching end or the second switching end.

[0032] Step S2 includes the following steps:

[0033] S21, calculate the safety circuit module current I, I = X1 / R3, R3 is the resistance value of the load;

[0034] S22, calculate the resistance value between the high-voltage ends of two adjacent even-numbered safety door lock switches to determine whether there is a short circuit between the high-voltage ends of the two adjacent even-numbered safety door lock switches, including the following steps: S221, the control module controls whether the controlled power supply module supplies power to the switching switch to achieve the connection between the fixed end and the first switching end; S222, obtain the voltage value of the high-voltage end of each even-numbered safety door lock switch through the detection circuit module, and set the voltage value of the high-voltage end of the even-numbered safety door lock switch i to X i ; S223, according to the calculated resistance value between the high-voltage ends of two adjacent even-numbered safety door lock switches, determine whether there is an abnormal resistance value between the high-voltage ends of two adjacent even-numbered safety door lock switches. If yes, find out the two adjacent even-numbered safety door lock switches with abnormal resistance values, mark the abnormal two adjacent even-numbered safety door lock switches, and perform step S23 at the same time; if no, then the command output result is: no short circuit of the rear safety door lock switch, and perform step S24;

[0035] S23, calculate the resistance values ​​of all safety door lock switches, find out which of the two even-numbered safety door lock switches adjacent to each other is abnormal, and output the result as follows: safety door lock switch number M is abnormal;

[0036] S24, short circuit judgment is completed, and the short circuit judgment result is output.

[0037] Step S223 includes the following steps:

[0038] S2231, suppose the resistance between the high voltage end of the even number i safety door lock switch and the high voltage end of the even number i+1 safety door lock switch is R i , R i =(X i -X i-1 ) / I;

[0039] S2232, calculate all R i Mean R0;

[0040] S2233, calculate and judge each R i Is it within the range (R0-△R, R0+△R), △R is the set value; if so, the command output result is: no rear safety door lock switch is not short-circuited, and then proceed to step S24; if not, then find out R i For the abnormally adjacent even-numbered safety door lock switches that are not within the range (R0-△R, R0+△R), the values ​​of the Q sequence are equal to the serial numbers of the abnormally adjacent even-numbered safety door lock switches, and step S23 is performed.

[0041] Step S23 includes the following steps:

[0042] S231, the control module controls whether the controlled power supply module supplies power to the switch, thereby connecting the fixed end and the second switching end;

[0043] S232, obtain the voltage value of the low voltage end of each even-numbered safety door lock switch through the detection circuit module, and set the voltage value of the high voltage end of the even-numbered safety door lock switch i to be Y i ;

[0044] S233, according to X i and Y i Calculate the resistance value at each safety door lock switch, and determine whether the resistance value at each full door lock switch in the Q sequence is abnormal. If it is abnormal, determine that the corresponding safety door lock switch is short-circuited, and record the corresponding safety door lock switch serial number in the sequence M. The output result is: the safety door lock switch serial number M is abnormal, and proceed to step S24; if it is not abnormal, determine that the corresponding safety door lock switch is not short-circuited.

[0045] In step S233, the resistance value of the safety door lock switch at sequence number j is set to Q j ;

[0046] Calculate the resistance value of all safety door lock switches to be Q j The average value q;

[0047] The basis for judging whether the resistance value at each full door lock switch in the Q sequence is abnormal is: judging whether the resistance value Qj at each full door lock switch in the Q sequence is within the range (q-△q, q+△q), where △q is the set value.

[0048] Each detection execution module includes: photoelectric coupler U1, resistor R1, resistor R2, amplifier U2 and capacitor C1, the anode of the diode in the photoelectric coupler U1 is the input end of the detection control module, the cathode of the diode in the photoelectric coupler U1 is grounded through the resistor R1, the input end of the photoreceptor in the photoelectric coupler U1 is connected to the DC power supply 5v, the output end of the photoreceptor in the photoelectric coupler U1 is connected to the first end of the resistor R2 and the input end of the amplifier U2, the second end of the resistor R2 is grounded, the output end of the amplifier U2 is the output end of the detection control module, the output end of the amplifier U2 is connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded. The photoelectric coupler U1 realizes the isolation between the circuit where the resistor R1 is located and the circuit where the resistor R2 is located, avoiding the damage of the control module due to the high voltage applied to the first input end of the control module.

[0049] If the high voltage end of the first safety door lock switch is not connected to the detection circuit module, the resistance value of the safety door lock switch cannot be detected when the DC power supply 110v is unstable. Therefore, a detection circuit module can be added to connect the first safety door lock switch to detect the resistance value of the first safety door lock switch and determine whether the first safety door lock switch is short-circuited when the DC power supply 110v is unstable.

[0050] If the number of safety door lock switches is an odd number, the resistance value of the last safety door lock switch can be calculated by the voltage value of the low voltage end of the last even-numbered safety door lock switch and the voltage value detected by the loop detection module to determine whether the last safety door lock switch is short-circuited, thereby avoiding missed detection.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. Elevator safety door lock switch signal and resistance detection method, characterized in that: The elevator safety door lock switch signal and resistance detection method is implemented based on the elevator safety door lock switch signal and resistance detection system, which includes: a safety loop module, a detection circuit module, a controlled power supply module, a loop detection module and a control module. The safety loop module includes: a safety door lock switch, and there are N safety door lock switches. All safety door lock switches are connected in series to form a safety loop module. The high-voltage end of the safety loop module is connected to a high-voltage DC power supply of 110V, and the low-voltage end of the safety loop module is grounded through a load; Number each safety door lock switch in sequence from the high-voltage end of the safety circuit module to the low-voltage end of the safety circuit module. The safety door lock switch closest to the high-voltage end of the safety circuit module is an odd number. A detection circuit module is provided corresponding to each even-numbered safety door lock switch, and the detection circuit module includes: a switching switch and a detection execution circuit, the first switching end of the switching switch is connected to the high voltage end of each even-numbered safety door lock switch, the second switching end of the switching switch is connected to the low voltage end of each even-numbered safety door lock switch, the fixed end of the switching switch is connected to the input end of the detection execution circuit, and the output end of the detection execution circuit is connected to the first input end of the control module; The high voltage end of the load is connected to the input end of the loop detection module, and the output end of the loop detection module is connected to the second input end of the control module; The switching switch is powered by a controlled power supply module, the control end of the controlled power supply module is connected to the output end of the control module, and the control module switches the connection between the fixed end and the first switching end, or switches the connection between the fixed end and the second switching end by controlling whether the controlled power supply module supplies power to the switching switch; The elevator safety door lock switch signal and resistance detection method comprises the following steps: S1, obtain the load high voltage terminal voltage as X1 through the loop detection module; S2. Obtain the voltage values ​​of the high-voltage terminals of all even-numbered safety door lock switches and the voltage values ​​of the low-voltage terminals of even-numbered safety door lock switches by controlling the switching switch to determine whether there is a short circuit in the safety door lock switch.

2. The elevator safety door lock switch signal and resistance detection method according to claim 1, characterized in that: Step S2 includes the following steps: S21, calculate the safety circuit module current I, I = X1 / R3, R3 is the resistance value of the load; S22, calculate the resistance value between the high-voltage ends of two adjacent even-numbered safety door lock switches to determine whether there is a short circuit between the high-voltage ends of the two adjacent even-numbered safety door lock switches, including the following steps: S221, the control module controls whether the controlled power supply module supplies power to the switching switch to achieve the connection between the fixed end and the first switching end; S222, obtain the voltage value of the high-voltage end of each even-numbered safety door lock switch through the detection circuit module, and set the voltage value of the high-voltage end of the even-numbered safety door lock switch i to X i ; S223, according to the calculated resistance value between the high-voltage ends of two adjacent even-numbered safety door lock switches, determine whether there is an abnormal resistance value between the high-voltage ends of two adjacent even-numbered safety door lock switches. If yes, find out the two adjacent even-numbered safety door lock switches with abnormal resistance values, mark the abnormal two adjacent even-numbered safety door lock switches, and perform step S23 at the same time; If not, the command output result is: no rear safety door lock switch is not short-circuited, and step S24 is performed; S23, calculate the resistance values ​​of all safety door lock switches, find out which of the two even-numbered safety door lock switches adjacent to each other is abnormal, and output the result as follows: safety door lock switch number M is abnormal; S24, short circuit judgment is completed, and the short circuit judgment result is output.

3. The elevator safety door lock switch signal and resistance detection method according to claim 2, characterized in that: Step S223 includes the following steps: S2231, suppose the resistance between the high voltage end of the even number i safety door lock switch and the high voltage end of the even number i+1 safety door lock switch is R i , R i =(X i -X i-1 ) / I; S2232, calculate all R i Mean R0; S2233, calculate and judge each R i Is it within the range (R0-△R, R0+△R), △R is the set value; if so, the command output result is: no rear safety door lock switch is not short-circuited, and then proceed to step S24; if not, then find out R i For the abnormally adjacent even-numbered safety door lock switches that are not within the range (R0-△R, R0+△R), the values ​​of the Q sequence are equal to the serial numbers of the abnormally adjacent even-numbered safety door lock switches, and step S23 is performed.

4. The elevator safety door lock switch signal and resistance detection method according to claim 3, characterized in that: Step S23 includes the following steps: S231, the control module controls whether the controlled power supply module supplies power to the switch, thereby connecting the fixed end and the second switching end; S232, obtain the voltage value of the low voltage end of each even-numbered safety door lock switch through the detection circuit module, and set the voltage value of the high voltage end of the even-numbered safety door lock switch i to be Y i ; S233, according to X i and Y i Calculate the resistance value at each safety door lock switch, and determine whether the resistance value at each full door lock switch in the Q sequence is abnormal. If it is abnormal, determine that the corresponding safety door lock switch is short-circuited, and record the corresponding safety door lock switch serial number in the sequence M. The output result is: the safety door lock switch serial number M is abnormal, and proceed to step S24; if it is not abnormal, determine that the corresponding safety door lock switch is not short-circuited.

5. The elevator safety door lock switch signal and resistance detection method according to claim 4, characterized in that: In step S233, the resistance value of the safety door lock switch at sequence number j is set to Q j ; Calculate the resistance value of all safety door lock switches to be Q j The average value q; The basis for judging whether the resistance value at each full door lock switch in the Q sequence is abnormal is: judging whether the resistance value Qj at each full door lock switch in the Q sequence is within the range (q-△q, q+△q), where △q is the set value.

6. The elevator safety door lock switch signal and resistance detection method according to claim 5, characterized in that: Each detection execution module includes: a photoelectric coupler U1, a resistor R1, a resistor R2, an amplifier U2 and a capacitor C1. The anode of the diode in the photoelectric coupler U1 is the input end of the detection control module, the cathode of the diode in the photoelectric coupler U1 is grounded through the resistor R1, the input end of the photoreceptor in the photoelectric coupler U1 is connected to a DC power supply of 5v, the output end of the photoreceptor in the photoelectric coupler U1 is connected to the first end of the resistor R2 and the input end of the amplifier U2, the second end of the resistor R2 is grounded, the output end of the amplifier U2 is the output end of the detection control module, the output end of the amplifier U2 is connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded.

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