A leakage detection and protection device for elevator electromagnetic brake coil

Abstract

The utility model discloses an elevator electromagnetic brake coil leakage detection and protection device, including a brake coil power supply circuit, a Hall current sensor, a power supply stabilization input circuit and an elevator safety circuit output circuit. The brake coil power supply circuit includes a brake power supply, a KMB isolation contactor, a KMS isolation contactor, a brake coil L1 and a brake coil L2. The LIN1 port and the LIN2 port of the Hall current sensor are connected in series to the DC110V line of the brake coil power supply circuit. The power supply stabilization input circuit is connected to the V+ port and the V-port of the Hall current sensor, and the out port of the Hall current sensor is connected to the elevator safety circuit output circuit. The utility model can protect the elevator safety. When the brake coil leaks, the elevator safety circuit can be disconnected immediately, so that the brake coil loses power and the brake is engaged.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, in particular to a leakage detection and protection device for an elevator electromagnetic brake coil. Background Art

[0002] GB / T7588.1-2020 "Safety Specifications for Elevator Manufacturing and Installation Part 1 Passenger Elevators and Freight Elevators" 5.10.1.2.3 requires that circuits and components above AC50V need to have residual current leakage protection devices. The current commonly used technical solution is to add a leakage protection circuit breaker to the AC power supply. However, the electromagnetic brake coil is powered by a DC power supply. Figure 1 As shown, after AC123V is converted into DC110V by the brake power supply, it provides power to the brake coils L1 and L2 through the KMB isolation contactor and KMS isolation contactor contacts.

[0003] Once the quality of the insulating paint inside the brake coil does not meet the standards and the coil touches the metal on the inner wall of the brake housing, causing the brake to leak, the brake elevator will run in a dragging manner, damaging the brake shoe. Utility Model Content

[0004] The utility model aims to provide an elevator electromagnetic brake coil leakage detection and protection device, which can protect the elevator safety.

[0005] The technical solution of the utility model is as follows:

[0006] An elevator electromagnetic brake coil leakage detection and protection device comprises a brake coil power supply circuit, wherein the brake coil power supply circuit comprises a brake power supply, a KMB isolation contactor, a KMS isolation contactor, a brake coil L1 and a brake coil L2, wherein the brake power supply is provided with an AC 123V input terminal, a DC 110V output terminal and a DC 0V output terminal, wherein the DC 110V output terminal of the brake power supply is connected to one end of the brake coil L1 and the brake coil L2 through the KMB isolation contactor, and the DC 0V output terminal of the brake power supply is connected to the other end of the brake coil L1 and the brake coil L2 through the KMS isolation contactor, and further comprises a Hall current sensor, a power supply stabilization input circuit and an elevator safety circuit output circuit, wherein the LIN1 port and the LIN2 port of the Hall current sensor are connected in series to the DC 110V line of the brake coil power supply circuit, the power supply stabilization input circuit is connected to the V+ port and the V- port of the Hall current sensor, and the out port of the Hall current sensor is connected to the elevator safety circuit output circuit.

[0007] Furthermore, the power stabilization input circuit includes a switching power supply and an isolation power supply, and the switching power supply is connected to the Hall current sensor via the isolation power supply.

[0008] Furthermore, the switching power supply adopts the switching power supply chip LM2575, and the isolated power supply adopts the SO505 isolated power supply.

[0009] Furthermore, the elevator safety circuit output circuit includes a DC isolation circuit, a signal amplifier, a signal conversion circuit, a microprocessor and an output relay which are sequentially connected in series, and the contacts of the output relay are connected in series to the elevator safety circuit.

[0010] Furthermore, the signal amplifier includes a LM358 first-stage operational amplifier and a LM358 second-stage operational amplifier connected in series.

[0011] Furthermore, the microprocessor adopts ATMEGA8L microprocessor.

[0012] Compared with the prior art, the beneficial effect of the utility model is that: the utility model adds a Hall current sensor to the DC110V line of the brake coil power supply circuit, detects the current flowing through the Hall current sensor, and forms a signal to be output to the elevator safety circuit output circuit through the OUT port. If any coil of the brake coil L1 or the brake coil L2 leaks, the elevator safety circuit outputs a command to the output relay to disconnect the elevator safety circuit, then the coils of the KMB isolation contactor and the KMS isolation contactor are de-energized, the contacts of the KMB isolation contactor and the KMS isolation contactor are disconnected, the brake coil L1 and the brake coil L2 lose power, the brake is actuated, and the elevator safety is protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 A circuit diagram for supplying power to an existing brake coil;

[0015] Figure 2 A circuit block diagram of an elevator electromagnetic brake coil leakage detection and protection device provided by the utility model;

[0016] Figure 3 This is a schematic diagram of the signal of the Hall current sensor of the utility model under normal conditions;

[0017] Figure 4 This is a schematic diagram of a signal when the Hall current sensor of the utility model detects leakage of either the brake coil L1 or the brake coil L2;

[0018] Figure 5 This is a circuit diagram of the elevator safety circuit output circuit of the utility model;

[0019] Figure 6 This is a schematic diagram of a signal after the DC signal is filtered out by the DC isolation circuit of the utility model;

[0020] Figure 7 This is a signal schematic diagram of the output relay of the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0023] Example

[0024] See also Figure 2 , this embodiment provides an elevator electromagnetic brake coil leakage detection and protection device, including a brake coil power supply circuit, a Hall current sensor, a power supply stabilization input circuit and an elevator safety circuit output circuit. Among them, the brake coil power supply circuit includes a brake power supply, a KMB isolation contactor, a KMS isolation contactor, a brake coil L1 and a brake coil L2, the brake power supply is provided with an AC 123V input terminal and a DC 110V output terminal and a DC 0V output terminal, the DC 110V output terminal of the brake power supply is connected to one end of the brake coil L1 and the brake coil L2 through the KMB isolation contactor, the DC 0V output terminal of the brake power supply is connected to the other end of the brake coil L1 and the brake coil L2 through the KMS isolation contactor, and after the AC123V is converted to DC110V by the brake power supply, it provides power for the brake coils L1 and L2 through the contacts of the KMB isolation contactor and the KMS isolation contactor. The LIN1 port and LIN2 port of the Hall current sensor are connected in series to the DC110V line of the brake coil power supply circuit. The Hall current sensor detects the current flowing through the LIN1 port and the LIN2 port, and forms a signal to be output through the out port. Under normal circumstances, the signal output from the out port is a DC signal without ripple. Figure 3As shown; if any of the brake coils L1 or L2 is detected to be leaking, an AC ripple will be superimposed on the DC signal, such as Figure 4 The out port of the Hall current sensor is connected to the elevator safety circuit output circuit. Figure 5 As shown, the elevator safety circuit output circuit includes a DC isolation circuit, a signal amplifier, a signal conversion circuit, a microprocessor and an output relay connected in series in sequence. The contacts of the output relay are connected in series in the elevator safety circuit, wherein the signal amplifier includes an LM358 first-stage operational amplifier and an LM358 second-stage operational amplifier connected in series in sequence, and the microprocessor adopts an ATMEGA8L microprocessor; the output signal of the out port of the Hall current sensor is filtered out by the DC isolation circuit to obtain an AC ripple signal, such as Figure 6 As shown; the signal is then input into the microprocessor after passing through the signal amplifier. After the microprocessor detects the signal, it outputs instructions to the output relay, such as Figure 7 As shown, when any of the brake coils L1 or L2 leaks electricity, the elevator safety circuit outputs a command to the output relay to disconnect the elevator safety circuit, and the coils of the KMB isolation contactor and the KMS isolation contactor are de-energized, the contacts of the KMB isolation contactor and the KMS isolation contactor are disconnected, the brake coils L1 and L2 lose power, and the brake is engaged to protect the elevator safety. The power supply stable input circuit is connected to the V+ port and the V- port of the Hall current sensor. The power supply stable input circuit includes a switching power supply and an isolated power supply. The switching power supply is connected to the Hall current sensor through the isolated power supply. The switching power supply uses the switching power supply chip LM2575, and the isolated power supply uses the SO505 isolated power supply. The LM2575 switching power supply provides a stable and reliable DC5V power supply for the device. The SO505 isolated power supply can provide a more stable power supply for the Hall current sensor, the microprocessor, the output relay, etc. to isolate the external input interference.

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An elevator electromagnetic brake coil leakage detection and protection device, comprising a brake coil power supply circuit, the brake coil power supply circuit comprising a brake power supply, a KMB isolation contactor, a KMS isolation contactor, a brake coil L1 and a brake coil L2, the brake power supply is provided with an AC 123V input terminal, a DC 110V output terminal and a DC 0V output terminal, the DC 110V output terminal of the brake power supply is connected to one end of the brake coil L1 and the brake coil L2 through the KMB isolation contactor, and the DC 0V output terminal of the brake power supply is connected to the other end of the brake coil L1 and the brake coil L2 through the KMS isolation contactor, characterized in that: It also includes a Hall current sensor, a power supply stabilization input circuit and an elevator safety circuit output circuit. The LIN1 port and LIN2 port of the Hall current sensor are connected in series to the DC110V line of the brake coil power supply circuit. The power supply stabilization input circuit is connected to the V+ port and V- port of the Hall current sensor. The out port of the Hall current sensor is connected to the elevator safety circuit output circuit.

2. The elevator electromagnetic brake coil leakage detection and protection device according to claim 1 is characterized in that: The power stabilization input circuit comprises a switching power supply and an isolation power supply, and the switching power supply is connected to the Hall current sensor via the isolation power supply.

3. The elevator electromagnetic brake coil leakage detection and protection device according to claim 2 is characterized in that: The switching power supply adopts the switching power supply chip LM2575, and the isolated power supply adopts the SO505 isolated power supply.

4. The elevator electromagnetic brake coil leakage detection and protection device according to claim 1, characterized in that: The elevator safety circuit output circuit comprises a DC isolation circuit, a signal amplifier, a signal conversion circuit, a microprocessor and an output relay which are connected in series in sequence, and the contacts of the output relay are connected in series to the elevator safety circuit.

5. The elevator electromagnetic brake coil leakage detection and protection device according to claim 4 is characterized in that: The signal amplifier comprises an LM358 first-stage operational amplifier and an LM358 second-stage operational amplifier which are sequentially connected in series.

6. The elevator electromagnetic brake coil leakage detection and protection device according to claim 4, characterized in that: The microprocessor adopts ATMEGA8L microprocessor.

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