CN113772507B - Method for detecting wiring form of fault protection switch of elevator brake - Google Patents

Abstract

The invention discloses a method for detecting the wiring form of a fault protection switch of an elevator brake, which relates to the technical field of elevator brake inspection and detection, and can directly detect at a junction box of an elevator host machine, and can judge the wiring form of the fault protection switch of the brake by a single person after wiring is finished, thereby realizing the quick judgment of the wiring form. The invention relates to a method for detecting the wiring form of a fault protection switch of an elevator brake, which is characterized in that two fault protection switches of the elevator brake are respectively connected with an external detection switch in series, and one of the fault protection switches of the elevator brake is connected with one external detection switch in parallel; through controlling the on-off states of the three external detection switches, voltages V12 and V34 at two ends of the two brake fault protection switches are measured, six wiring modes of the elevator brake fault protection switches are judged according to the logical relation that whether V12 and V34 are zero, and whether the elevator brake fault protection switches are in a hidden danger wiring mode or not is determined.

Description

Method for detecting wiring form of fault protection switch of elevator brake

Technical Field

The invention relates to the technical field of elevator brake inspection and detection, in particular to a method for detecting a wiring form of a fault protection switch of an elevator brake.

Background

The brake is an important safety component of an elevator, the importance of which in an elevator is as important as the brake system of a car for car safety. The brake has the main functions of realizing zero-speed band-type brake braking when the elevator normally stops at a landing, ensuring that the elevator is always in a stop state when passengers enter or exit, and implementing emergency braking when the elevator car breaks down in the movement process, so that the elevator can be emergently stopped at a certain deceleration, and the life and property safety of passengers in the car is ensured.

The current national standard GB 7588-2003 "elevator manufacturing and installation safety code" 12.4.2.1 states that all brake mechanical components involved in applying braking force to a brake wheel or disc should be installed in two groups. If one group is not functioning, there should still be enough braking force to decelerate the car carrying the rated load descending at the rated speed. According to standard requirements, two sets of brakes are installed on an elevator main machine, and the two sets of brakes can synchronously act when the elevator runs normally. The safety technical specification TSG-T7001-2009 elevator supervision and periodic inspection rule, clause 2.8 (8) stipulates that a brake failure protection function should be provided to prevent normal starting of an elevator when lifting (or releasing) failure of the brake is monitored. When the brake fault protection function works, the lifting or releasing action of the brake is generally monitored by a brake fault protection switch, when the action (the lifting action or the releasing action) of the brake is monitored, the brake fault protection switch sends a switch signal to an elevator main controller to verify the action state of the brake, and when four brake action faults of lifting failure of two brakes, releasing failure of two brakes, lifting failure of a single brake or releasing failure of the single brake occur, the elevator is prevented from being normally started again until the fault is recovered manually by a maintenance person. Because of the difference of elevator electrical design and mounting means, there are six stopper fault protection switch wiring forms in the elevator when the stopper braking, do respectively: the normally open independent wiring form, the normally open parallel connection line form, the normally open series connection line form, the normally closed independent wiring form, the normally closed parallel connection line form and the normally closed series connection line form. Only in the normal open independent wiring form and the normal close independent wiring form, the elevator main controller can effectively detect all four brake action faults to ensure the safe operation of the elevator, and all the other four wiring forms are hidden danger wiring forms. Therefore, in order to ensure the normal operation of the elevator brake and the safe and reliable operation of the elevator, the wiring form of the brake fault protection switch needs to be detected in the elevator inspection process.

The method is characterized in that an original design circuit diagram of an elevator is required to be referred and a drawing is required to be referred for verifying the actual wiring condition, wiring terminals of a brake fault protection switch signal introduction control cabinet are required to be found at the elevator control cabinet in the process, one inspector acts by manually touching mechanical parts of the brake fault protection switch, the other inspector simultaneously detects the voltage change between the wiring terminals by a universal meter, and therefore the normally open or normally closed wiring mode is judged.

Disclosure of Invention

The invention aims to provide a method for detecting the wiring form of an elevator brake fault protection switch, which can directly detect at a junction box of an elevator main machine, and can finish the judgment of the wiring type of the brake fault protection switch by one person after the wiring is finished, thereby realizing the quick judgment of the wiring form.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for detecting the wiring form of fault protection switches of elevator brakes is characterized in that two fault protection switches of the elevator brakes are respectively connected with an external detection switch in series, and one of the fault protection switches of the elevator brakes is connected with one external detection switch in parallel; the on-off states of the three external detection switches are controlled, voltages V12 and V34 at two ends of the two brake fault protection switches are measured, and the wiring mode of the elevator brake fault protection switches is judged according to the logical relation of whether the voltages V12 and V34 are zero or not.

Specifically, one of the elevator brake fault protection switches KBZ1 is connected in series with an external detection switch Kb1, and the other elevator brake fault protection switch KBZ2 is connected in series with an external detection switch Kb2;

and an external detection switch Ka is connected in parallel at the outer sides of one brake fault protection switch KBZ1 and the external detection switch Kb 1.

Alternatively, one of the elevator brake fault protection switches KBZ1 is connected in series with an external detection switch Kb1, and the other elevator brake fault protection switch KBZ2 is connected in series with an external detection switch Kb2;

and an external detection switch Ka is connected in parallel at the outer sides of the other elevator brake fault protection switch KBZ2 and the external detection switch Kb 2.

Further, the three external detection switches Ka, kb1 and Kb2 are controlled to be switched on and off, and specifically and correspondingly comprise three detection modes:

the first mode is as follows: ka. Kb1 and Kb2 are both disconnected;

and a second mode: ka is opened, any one of Kb1 and Kb2 is opened, and the other is closed;

and a third mode: ka closed, kb1 open, kb2 open.

Furthermore, the voltages V12 and V34 at the two ends of the KBZ1 and the KBZ2 of the brake fault protection switch KBZ1 are measured, and the six wiring forms are judged according to the logic relation of whether the voltages V12 and V34 are zero or not under the on-off states of different external detection switches Ka, kb1 and Kb 2:

for the mode one, if V12 and V34 are detected to be zero, the mode is a normally open series or normally closed series connection wiring mode, and if V12 and V34 are not equal to zero, the mode is a normally open independent, normally open parallel, normally closed independent or normally closed parallel connection wiring mode;

for the mode two, if both V12 and V34 are not zero, the connection mode is a normally open independent, normally open parallel connection or normally open series connection line mode; if one of V12 and V34 is zero and the other is not zero, the connection line is a normally closed independent or normally closed series connection line form, and if both V12 and V34 are zero, the connection line is a normally closed parallel connection line form;

for the third mode, if one of V12 and V34 is zero and the other is not zero, the connection mode is a normally open independent, normally open series, normally closed independent or normally closed series connection; if both V12 and V34 are zero, the two are in the form of normally open parallel connection or normally closed parallel connection lines.

Still further, a mode one is adopted to set the detection switch, even if the external detection switches Ka, kb1 and Kb2 are all disconnected, voltages V12 and V34 at two ends of the brake fault protection switches KBZ1 and KBZ2 are measured, if V12=0 and V34=0, a serial connection mode is adopted, otherwise, an independent or parallel connection mode is adopted;

if the external connection detection switch Ka is disconnected, any one of the external connection detection switches Kb1 and Kb2 is disconnected, and the other one is closed, if V12 is not equal to 0 and V34 is not equal to 0, the external connection detection switch Kb is in a normally open serial connection mode, otherwise, the external connection detection switch Kb is in a normally closed serial connection mode;

if the mode I is detected to be the independent or parallel connection mode, the mode II is continuously detected, if V12 is not equal to 0 and V34 is not equal to 0, the mode is the normally open independent or normally open parallel connection mode, otherwise, the mode is the normally closed independent or normally closed parallel connection mode;

for the normally-open independent or normally-open parallel connection mode, a mode III is adopted for further judgment, even if the external detection switch Ka is closed and the Kb1 and the Kb2 are both disconnected, if V12=0 and V34=0, the normally-open parallel connection mode is adopted, otherwise, the normally-open independent connection mode is adopted;

for the normally closed independent or normally closed parallel connection mode, if V12=0 and V34=0 in the second mode, the normally closed parallel connection mode is adopted, otherwise, the normally closed independent connection mode is adopted.

Alternatively, a mode two detection switch is adopted, even if an external detection switch Ka is opened, any one of Kb1 and Kb2 is opened, the other is closed, voltages V12 and V34 at two ends of brake fault protection switches KBZ1 and KBZ2 are measured, if V12=0 and V34=0, a normally closed parallel connection mode can be directly judged, if only one of V12 and V34 is zero, the other is not zero, a normally closed independent or normally closed series connection mode is adopted, and if V12 ≠ 0 and V34 ≠ 0, a normally open independent, normally open parallel connection or normally open series connection mode is adopted;

if the connection mode is a normally closed connection mode, then a mode one setting detection switch is adopted, even if the external detection switches Ka, kb1 and Kb2 are all disconnected, if V12=0 and V34=0, the connection mode is a normally closed series connection mode, otherwise, the connection mode is a normally closed independent connection mode;

for the normally open wiring mode, a mode I is adopted for further judgment, even if the external detection switches Ka, kb1 and Kb2 are all disconnected, if V12=0 and V34=0, the normally open serial wiring mode is adopted, otherwise, the normally open independent or normally open parallel wiring mode is adopted;

if the mode I is detected to be the independent or parallel connection mode, the mode III is continuously used for detection, even if the external detection switches Ka are closed, and the Kb1 and the Kb2 are all disconnected, if V12=0 and V34=0, the mode is the normally open parallel connection mode, otherwise, the mode is the normally open independent connection mode.

Alternatively, a mode three setting detection switch is adopted, even if the external detection switch Ka is closed, kb1 and Kb2 are both opened, voltages V12 and V34 at two ends of the brake fault protection switches KBZ1 and KBZ2 are measured, if V12=0 and V34=0, a normally open parallel connection or a normally closed parallel connection type wiring mode is determined, and if only one of V12 and V34 is zero and the other is not zero, a normally open independent, normally open series connection, normally closed independent or normally closed series connection type wiring mode is determined;

if the mode is a parallel connection mode, then a mode II is adopted to set a detection switch, even if an external detection switch Ka is disconnected, any one of Kb1 and Kb2 is disconnected, and the other is closed, if V12=0 and V34=0, the mode is a normally closed parallel connection mode, otherwise, the mode is a normally open parallel connection mode;

for other wiring modes, a mode II is adopted for further judgment, if only one of V12 and V34 is zero and the other is not zero, the mode is a normally closed independent or normally closed series connection mode, and if V12 is not equal to 0 and V34 is not equal to 0, the mode is a normally open independent or normally open series connection mode;

and continuing to detect through the first mode, even if the external detection switches Ka, kb1 and Kb2 are all opened, for a normally closed independent or normally closed series connection mode, if V12=0 and V34=0 in the first mode, the normally closed series connection mode is adopted, otherwise the normally closed independent connection mode is adopted, for a normally open independent or normally open series connection mode, if V12=0 and V34=0, the normally open series connection mode is adopted, and otherwise the normally open independent connection mode is adopted.

Compared with the prior art, the method for detecting the wiring form of the fault protection switch of the elevator brake has the following advantages:

1. the signal leading-out end of the brake fault protection switch controls the on-off of three external detection switches and measures the voltage at two ends of the brake fault protection switch, six wiring modes are rapidly detected, an electrical design drawing does not need to be checked on site, a wiring end does not need to be searched in an elevator control cabinet, and the test is convenient and rapid;

2. the detection flow of the detection method can be automatically realized by the control of platforms such as a single chip microcomputer and the like, so that the automatic detection of instruments is favorably realized, and the detection efficiency is improved.

Drawings

Fig. 1 is a schematic diagram of a common wiring form of six elevator brake fail-safe switches;

fig. 2 is a schematic structural diagram of a wiring mode of an external detection switch in a method for detecting a wiring mode of a fault protection switch of an elevator brake provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a wiring manner when a normally open independent wiring type circuit is detected in the method for detecting the wiring type of the elevator brake fault protection switch provided by the embodiment of the invention;

fig. 4 is a schematic structural diagram of a wiring manner when a circuit in a normally closed series connection wiring manner is detected in the method for detecting the wiring manner of the elevator brake failsafe switch provided by the embodiment of the invention;

fig. 5 is a schematic flow chart of a method for detecting the wiring form of the elevator brake fault protection switch according to an embodiment of the present invention;

fig. 6 is a lookup table of judgment of a butting line form in a voltage logic judgment method in a method for detecting a wiring form of an elevator brake fault protection switch according to an embodiment of the present invention.

Detailed Description

For the convenience of understanding, the method for detecting the wiring form of the elevator brake fault protection switch provided by the embodiment of the invention is described in detail below by combining the attached drawings of the specification.

As shown in fig. 1, there are six possible elevator brake failsafe switch wiring patterns: the cable comprises a normally open independent wiring form, a normally open parallel connection wiring form, a normally open series connection wiring form, a normally closed independent wiring form, a normally closed parallel connection wiring form and a normally closed series connection wiring form. The KBZ1 is a first brake fault protection switch, and the KBZ2 is a second brake fault protection switch, and is used for identifying the brake opening and contracting states of the brakes. Specifically, the normally open means that the fault protection switch is in an open state in the stop state of the elevator and is in a closed state in the running state of the elevator; the normal close means that the fault protection switch is in a closed state under the stop state of the elevator and is in an open state under the running state of the elevator. Further, the fault protection switch is powered by DC voltage and is connected to the elevator main control board, and the main control board judges the state of the brake according to whether the voltage of the input signal is zero or not. In addition, the normally open independent connection mode and the normally closed independent connection mode are normal connection modes, and the master control board can respectively confirm the brake contracting state and the brake releasing state of the two brakes in the two connection modes; the other four wiring forms are hidden danger wiring forms. Furthermore, for the normally open parallel connection line form, when the elevator runs, the KBZ1 and the KBZ2 are both closed under the normal condition, if one group of brakes fails to release the brake, so that the KBZ1 and the KBZ2 are not closed, the elevator main control board still receives a high level signal, so that the unilateral brake release failure condition cannot be effectively monitored, and the elevator runs with the brake; for the normally open serial connection form, when the elevator stops, the KBZ1 and the KBZ2 should be disconnected under normal conditions, if one group of brakes fails to brake, and one of the KBZ1 and the KBZ2 is not disconnected, the elevator main control board still receives a low level signal, so that the failure condition of the unilateral brake cannot be effectively monitored; for the form of a normally closed parallel connection line, when the elevator stops, the KBZ1 and the KBZ2 should be closed under normal conditions, if one group of brakes fails to brake, so that the KBZ1 and the KBZ2 are not closed, the elevator main control board still receives a high level signal, and therefore the failure condition of the unilateral brake cannot be effectively monitored; for a normally closed series connection mode, when the elevator runs, the KBZ1 and the KBZ2 are disconnected under a normal condition, if one of the KBZ1 and the KBZ2 is not disconnected due to the brake release failure of one group of brakes, the elevator main control board still receives a low level signal, so that the unilateral brake release failure condition cannot be effectively monitored, and the elevator runs with a brake.

According to the method for detecting the wiring form of the elevator brake fault protection switch, three external detection switches Ka, kb1 and Kb2 are adopted to perform analog control on the on-off states of the brake fault protection switches KBZ1 and KBZ2, and the wiring form of the external switches is shown in FIG. 2. Ka is connected in parallel with one of the brake fault protection switches KBZ1 and KBZ2, and is shown in FIG. 2 to be connected in parallel with KBZ1, kb1 is connected in series with KBZ1, and Kb2 is connected in series with KBZ 2. In practical application, the wiring mode when detecting the normally open independent wiring type circuit is shown in fig. 3; the wiring mode when detecting a circuit in the form of a normally closed series wiring is shown in fig. 4; the detection of the other wiring forms is similar to the above and is not listed. In fig. 4, when detecting a circuit in which the brake failsafe switches are in a serial connection form, since the connection forms of 2 brake failsafe switches are not known in advance during detection, two connection modes may occur in the external switch, that is, ka is connected in parallel with the brake failsafe switch far away from the main control board (mode one) or Ka is connected in parallel with the brake failsafe switch close to the main control board (mode two), but the specific connection mode does not affect the result determination.

Specifically, the on-off states of three external detection switches Ka, kb1 and Kb2 are set, voltages V34 at two ends of (1) and (2) of KBZ1 and voltages V12 at two ends of (3) and (4) of KBZ2 are measured, and six wiring forms can be judged by the logical relationship of whether V12 and V34 are zero or not in the on-off states of different detection switches. Further, different on-off states of the external detection switch correspond to three detection modes, which are respectively:

the first mode is as follows: ka. Kb1 and Kb2 are both disconnected;

and a second mode: ka is opened, any one of Kb1 and Kb2 is opened, and the other is closed;

and a third mode: ka closed, kb1 open, kb2 open.

The logical relationship of whether V12 and V34 are equal to zero in the three modes is shown in the following table (note: for the convenience of analysis, different logical states of V12 and V34 are shown in the form of "bold and enlarged"), and another way of expressing this table is shown in FIG. 6:

/>

look-up table for judging butt line form by' voltage logic judging method

For the mode one, if the V12 and the V34 are detected to be zero, the connection mode is a normally open series connection or normally closed series connection mode, and if the V12 and the V34 are not equal to zero, the connection mode is the other four connection modes;

for the mode two, if both V12 and V34 are not zero, the connection mode is a normally open independent, normally open parallel connection or normally open series connection line mode; if one of V12 and V34 is zero and the other is not zero, the connection mode is a normally closed independent or normally closed series connection line mode, and if both V12 and V34 are zero, the connection mode is a normally closed parallel connection line mode;

for mode three, if one of V12 and V34 is zero and the other is not, it is in the form of a normally open independent, normally open series, normally closed independent or normally closed series connection wiring; if both V12 and V34 are zero, the two are in the form of normally open parallel connection or normally closed parallel connection lines.

A flowchart of an example of detection based on the logical judgment relationship in the above table is shown in FIG. 5. Adopting a mode one setting detection switch, even if Ka, kb1 and Kb2 are all disconnected, measuring voltages V12 and V34 at two ends of KBZ1 and KBZ2, if V12=0 and V34=0, a serial connection mode is adopted, otherwise, an independent or parallel connection mode is adopted; if the connection mode is a series connection mode, then a mode II is adopted to set a detection switch, even if Ka is disconnected, one of Kb1 and Kb2 is disconnected, and the other one is closed, if V12 is not equal to 0 and V34 is not equal to 0, the connection mode is a normally open series connection mode, otherwise, the connection mode is a normally closed series connection mode; if the mode I is detected to be an independent or parallel connection mode, the mode II is continuously detected, if V12 is not equal to 0 and V34 is not equal to 0, the mode is a normally open independent or normally open parallel connection mode, otherwise, the mode is a normally closed independent or normally closed parallel connection mode, for the former, mode III is adopted for further judgment, namely Ka is closed, kb1 and Kb2 are both disconnected, if V12=0 and V34=0, the mode is a normally open parallel connection mode, otherwise, the mode is a normally open independent connection mode, for the latter, if V12=0 and V34=0 in the mode II, the mode is a normally closed parallel connection mode, otherwise, the mode is a normally closed independent connection mode.

It should be noted that, in addition to the above-described flow, the execution order of the three on-off modes may be changed during the test, for example, the mode two may be set first, if V12=0 and V34=0 in the mode two, it may be directly determined as the normally closed parallel connection type wiring method, if V12 ≠ 0 and V34 ≠ 0, it is the normally open independent, normally open parallel connection, or normally open series connection type, and if only one of V12 and V34 is zero and the other is not zero, it is the normally closed independent or normally closed series connection type. And then further judging the specific wiring form through a mode one and a mode three.

In summary, the method for detecting the wiring form of the elevator brake fault protection switch provided by the embodiment of the invention can directly detect the wiring ends of the two brake fault protection switches at the junction box of the elevator main machine without searching the wiring ends of the fault protection switch in the elevator control cabinet; in addition, the method sets the external detection switch, sets the on-off state of the external detection switch, judges the wiring form of the brake fault protection switch according to the logical relation of the voltages at two ends of the two fault protection switches of the elevator under different on-off states of the external detection switch, judges whether the wiring form is a normal wiring form or a hidden danger wiring form, ensures the safe operation of the elevator, and has good popularization and application values.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (4)

1. A method for detecting the wiring form of fault protection switches of elevator brakes is characterized in that two fault protection switches of the elevator brakes are respectively connected with an external detection switch in series, and one fault protection switch of the elevator brakes is connected with one external detection switch in parallel; the on-off state of the three external detection switches is controlled, voltages V12 and V34 at two ends of two brake fault protection switches are measured, and the wiring mode of the elevator brake fault protection switch is judged according to the logical relation of whether the voltages V12 and V34 are zero or not;

one of the elevator brake fault protection switches KBZ1 is connected with an external detection switch Kb1 in series, and the other elevator brake fault protection switch KBZ2 is connected with an external detection switch Kb2 in series; an external detection switch Ka is connected in parallel at the outer sides of one brake fault protection switch KBZ1 and the external detection switch Kb 1;

one of the elevator brake fault protection switches KBZ1 is connected with an external detection switch Kb1 in series, and the other elevator brake fault protection switch KBZ2 is connected with an external detection switch Kb2 in series; an external detection switch Ka is connected in parallel with the outer sides of the other elevator brake fault protection switch KBZ2 and the external detection switch Kb2;

by controlling the on-off states of the three external detection switches Ka, kb1 and Kb2, three detection modes are correspondingly included: the first mode is as follows: ka. Kb1 and Kb2 are both disconnected; and a second mode: ka is opened, any one of Kb1 and Kb2 is opened, and the other one is closed; and a third mode: ka closed, kb1 open, kb2 open;

measuring voltages V12 at two ends of a brake fault protection switch KBZ1 and voltages V34 at two ends of a KBZ2, and judging six wiring forms through a logic relation of whether the voltages V12 and V34 are zero or not under the on-off states of different external detection switches Ka, kb1 and Kb 2: for the first mode, if it is detected that V12 and V34 are both zero, the mode is a normally open series or normally closed series connection wiring mode, and if V12 and V34 are not equal to zero, the mode is a normally open independent, normally open parallel, normally closed independent or normally closed parallel connection wiring mode; for the mode two, if both V12 and V34 are not zero, the connection mode is a normally open independent, normally open parallel connection or normally open series connection mode; if one of V12 and V34 is zero and the other is not zero, the connection mode is a normally closed independent or normally closed series connection line mode, and if both V12 and V34 are zero, the connection mode is a normally closed parallel connection line mode; for the third mode, if one of V12 and V34 is zero and the other is not zero, the connection mode is a normally open independent, normally open series, normally closed independent or normally closed series connection; if both V12 and V34 are zero, the two are in the form of normally open parallel connection or normally closed parallel connection lines.

2. The method for detecting the wiring form of the brake fail-safe switch of the elevator according to claim 1, wherein the mode one setting of the detecting switch is adopted, even if the external detecting switches Ka, kb1 and Kb2 are all turned off, the voltages V12 and V34 across the brake fail-safe switches KBZ1 and KBZ2 are measured, if V12=0 and V34=0, the series wiring mode is adopted, otherwise, the independent or parallel wiring mode is adopted;

if the external connection detection switch Ka is disconnected, any one of the external connection detection switches Kb1 and Kb2 is disconnected, and the other one is closed, if V12 is not equal to 0 and V34 is not equal to 0, the external connection detection switch Kb is in a normally open serial connection mode, otherwise, the external connection detection switch Kb is in a normally closed serial connection mode;

if the mode I is detected to be the independent or parallel connection mode, the mode II is continuously detected, if V12 is not equal to 0 and V34 is not equal to 0, the mode is the normally open independent or normally open parallel connection mode, otherwise, the mode is the normally closed independent or normally closed parallel connection mode;

for the normally-open independent or normally-open parallel connection mode, a mode III is adopted for further judgment, even if the external detection switch Ka is closed and the Kb1 and the Kb2 are both disconnected, if V12=0 and V34=0, the normally-open parallel connection mode is adopted, and otherwise, the normally-open independent connection mode is adopted;

for the normally closed independent or normally closed parallel connection mode, if V12=0 and V34=0 in the second mode, the mode is the normally closed parallel connection mode, otherwise, the mode is the normally closed independent connection mode.

3. The method for detecting the wiring form of the elevator brake fault protection switch according to claim 1, characterized in that a mode two setting detection switch is adopted, even if an external detection switch Ka is opened, either one of Kb1 and Kb2 is opened and the other is closed, voltages V12 and V34 at two ends of the brake fault protection switches KBZ1 and KBZ2 are measured, if V12=0 and V34=0, the normally closed parallel type wiring mode can be directly judged, if only one of V12 and V34 is zero and the other is not zero, the normally closed independent or normally closed series wiring mode is judged, and if V12 ≠ 0 and V34 ≠ 0, the normally closed independent, normally open parallel or normally open series wiring mode is judged;

if the connection mode is a normally closed connection mode, then a mode one setting detection switch is adopted, even if the external detection switches Ka, kb1 and Kb2 are all disconnected, if V12=0 and V34=0, the connection mode is a normally closed series connection mode, otherwise, the connection mode is a normally closed independent connection mode;

for the normally open wiring mode, a mode one is adopted for further judgment, even if the external detection switches Ka, kb1 and Kb2 are all disconnected, if V12=0 and V34=0, the normally open serial wiring mode is adopted, otherwise, the normally open independent or normally open parallel wiring mode is adopted;

if the mode I is detected to be the independent or parallel connection mode, the mode III is continuously detected, even if the external detection switch Ka is closed, the Kb1 and the Kb2 are all disconnected, if V12=0 and V34=0, the normally open parallel connection mode is adopted, otherwise, the normally open independent connection mode is adopted.

4. The method for detecting the wiring form of the elevator brake fault protection switch according to claim 1, characterized in that a mode three setting detection switch is adopted, even if an external detection switch Ka is closed, kb1 and Kb2 are both opened, voltages V12 and V34 at two ends of the brake fault protection switches KBZ1 and KBZ2 are measured, if V12=0 and V34=0, a normally open parallel connection or a normally closed parallel connection type wiring mode is judged, and if only one of V12 and V34 is zero and the other is not zero, a normally open independent, normally open series connection, normally closed independent or normally closed series connection type wiring mode is judged;

if the mode is a parallel connection mode, then a mode II is adopted to set a detection switch, even if an external detection switch Ka is disconnected, any one of Kb1 and Kb2 is disconnected, and the other is closed, if V12=0 and V34=0, the mode is a normally closed parallel connection mode, otherwise, the mode is a normally open parallel connection mode;

for other wiring modes, a mode II is adopted for further judgment, if only one of V12 and V34 is zero and the other is not zero, the mode is a normally closed independent or normally closed series connection mode, and if V12 is not equal to 0 and V34 is not equal to 0, the mode is a normally open independent or normally open series connection mode;

and continuing to detect through the first mode, even if the external detection switches Ka, kb1 and Kb2 are all opened, for a normally closed independent or normally closed series connection mode, if V12=0 and V34=0 in the first mode, the normally closed series connection mode is adopted, otherwise the normally closed independent connection mode is adopted, for a normally open independent or normally open series connection mode, if V12=0 and V34=0, the normally open series connection mode is adopted, and otherwise the normally open independent connection mode is adopted.

Images