A safety protection circuit device for a lifting equipment brake

Abstract

The present invention provides a safety protection circuit device for a lifting equipment brake. When the main contact of the first contactor is stuck, the main contact of the second contactor disconnects the circuit; or, when the main contact of the second contactor is stuck, the main contact of the first contactor disconnects the circuit; two brake motor devices are applied in hardware, which plays a double insurance role of hardware. In software, a series circuit of the contactor controlling the two brakes and the main contactor of the main circuit control inverter is applied, which plays a double insurance role of software control. When a brake contactor contact is stuck or the mechanical part is blocked, the circuit loop is cut off from the other contactor contact. The failure rate of the brake is reduced and the maintenance cost is saved.

Description

Technical Field

[0001] The invention relates to a lifting equipment safety control technology, and in particular to a lifting equipment brake safety protection circuit device. Background Art

[0002] In the current lifting equipment, each mechanism of the lifting, opening and closing, and luffing mechanism of the lifting equipment is generally a main motor with a fan and a brake. As the lifting equipment is used for a longer time and the contactor components age, the contactor that controls the lifting equipment brake will have one or two main contact adhesions and mechanical parts jamming, so that the main contact of the contactor cannot be opened in time, resulting in brake failure and potential safety hazards. Summary of the invention

[0003] The invention provides a safety protection circuit device for a lifting equipment brake to improve safety.

[0004] A first aspect of the present invention provides a safety protection circuit device for a lifting equipment brake, comprising: a brake module and a control module;

[0005] Wherein, the braking module comprises: a first contactor, a second contactor, a first brake, a second brake, a frequency converter and a motor;

[0006] The frequency converter is electrically connected to the motor; the first contactor is electrically connected to the frequency converter and the second contactor respectively; the second contactor is electrically connected to the first brake and the second brake respectively; the first brake and the second brake are electrically connected to the motor respectively;

[0007] When the main contact of the first contactor is stuck, the main contact of the second contactor disconnects the circuit; or, when the main contact of the second contactor is stuck, the main contact of the first contactor disconnects the circuit;

[0008] When in the circuit-off state, the first brake and / or the second brake brakes the main shaft of the motor;

[0009] The control module is electrically connected to the first contactor, the second contactor and the frequency converter respectively;

[0010] The control module is used to control the first contactor, the second contactor and the frequency converter.

[0011] Optionally, the control module includes: a first intermediate relay, a second intermediate relay, a rising limit protection switch and a limit position bypass switch;

[0012] Wherein, the rising limit protection switch is connected in parallel with the bypass conversion switch of the limit position; the rising limit protection switch and the bypass conversion switch of the limit position are connected in series with the first intermediate relay; the first intermediate relay is connected in series with the first contactor;

[0013] The first intermediate relay is electrically connected to the frequency converter to obtain a fault signal of the frequency converter;

[0014] The second intermediate relay is electrically connected to the frequency converter to obtain the frequency converter operation signal.

[0015] Optionally, the braking module further includes: an input reactor and a fuse;

[0016] The input reactor and the fuse are connected in series with the first contactor; the fuse is connected in series with the frequency converter.

[0017] Optionally, when in the circuit-breaking state, if the first brake and the second brake are in normal state, the first brake and the second brake brake the main shaft of the motor; or,

[0018] If the first brake is in a normal state, the first brake brakes the main shaft of the motor; or,

[0019] If the second brake is in a normal state, the second brake brakes the main shaft of the motor.

[0020] Optionally, the brake module further comprises: a main circuit breaker, a first circuit breaker and a second circuit breaker;

[0021] Among them, the main circuit breaker is connected in series with the first contactor to control the circuit switch of the motor; the first circuit breaker is connected in series with the second contactor and the first brake to control the circuit switch of the first brake; the second circuit breaker is connected in series with the second contactor and the second brake to control the circuit switch of the second brake.

[0022] The safety protection circuit device of the lifting equipment brake provided by the embodiment of the present invention is that when the main contact of the first contactor has contact adhesion, the main contact of the second contactor disconnects the circuit; or, when the main contact of the second contactor has contact adhesion, the main contact of the first contactor disconnects the circuit; and then when the circuit is disconnected, the first brake and / or the second brake brakes the main shaft of the motor; the control module is electrically connected to the first contactor, the second contactor and the inverter respectively; the control module controls the first contactor, the second contactor and the inverter, and realizes the application of two brake motor devices in hardware, which plays a double insurance role of hardware. In software, the contactor controlling the two brakes and the main contactor of the main circuit controlling the inverter are connected in series, which plays a double insurance role of software control. When the contact of one brake contactor is adhered or the mechanical part is blocked, the circuit loop is cut off from the contact of another contactor. The failure rate of the brake is reduced and the maintenance cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a safety protection circuit device for a lifting equipment brake provided by an embodiment of the present invention;

[0024] Figure 2 A circuit diagram of a safety protection circuit device for a lifting equipment brake provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] Figure 1 A schematic diagram of a safety protection circuit device for a lifting equipment brake provided by an embodiment of the present invention is shown in FIG. Figure 1 , the device comprises: a braking module 1 and a control module 2;

[0026] The brake module 1 includes: a first contactor KM1, a second contactor KM2, a first brake YB1, a second brake YB2, an inverter INV1 and a motor M1;

[0027] The frequency converter INV1 is electrically connected to the motor M1; the first contactor KM1 is electrically connected to the frequency converter INV1 and the second contactor KM2 respectively; the second contactor KM2 is electrically connected to the first brake YB1 and the second brake YB2 respectively; the first brake YB1 and the second brake YB2 are electrically connected to the motor M1 respectively;

[0028] When the main contact of the first contactor KM1 is stuck, the main contact of the second contactor KM2 disconnects the circuit; or, when the main contact of the second contactor KM2 is stuck, the main contact of the first contactor KM1 disconnects the circuit;

[0029] When the circuit is disconnected, the first brake YB1 and / or the second brake YB2 brakes the main shaft of the motor M1;

[0030] The control module 2 is electrically connected to the first contactor KM1, the second contactor KM2 and the inverter INV1 respectively;

[0031] The control module 2 is used to control the first contactor KM1, the second contactor KM2 and the inverter INV1.

[0032] The safety protection circuit device of the lifting equipment brake provided by the embodiment of the present invention is that when the main contact of the first contactor has contact adhesion, the main contact of the second contactor disconnects the circuit; or, when the main contact of the second contactor has contact adhesion, the main contact of the first contactor disconnects the circuit; and then when the circuit is disconnected, the first brake and / or the second brake brakes the main shaft of the motor; the control module is electrically connected to the first contactor, the second contactor and the inverter respectively; the control module controls the first contactor, the second contactor and the inverter. , realizing the application of two brake motor devices in hardware, playing a double insurance role of hardware. In software, the contactor controlling the two brakes and the main contactor of the main circuit controlling the inverter are connected in series, playing a double insurance role of software control. When the contact of one brake contactor is adhered or the mechanical part is blocked, the circuit loop is cut off from the contact of another contactor. The failure rate of the brake is reduced and the maintenance cost is saved.

[0033] Furthermore, a possible implementation of the braking module 1 and the control module 2 is given below. Specifically, Figure 2 A circuit diagram of a safety protection circuit device for a lifting equipment brake provided by an embodiment of the present invention, see Figure 2 , a control module, including: a first intermediate relay K1, a second intermediate relay K2, a rising limit protection switch LS1 and a limit position bypass conversion switch SA1;

[0034] The rising limit protection switch LS1 is connected in parallel with the bypass switch SA1 at the limit position; the rising limit protection switch LS1 and the bypass switch SA1 at the limit position are connected in series with the first intermediate relay K1; the first intermediate relay K1 is connected in series with the first contactor KM1; specifically, SA1 is used for debugging and maintenance. The rising limit protection switch LS1 is used to control the closing of the first contactor KM1.

[0035] The first intermediate relay K1 is electrically connected to the frequency converter INV1 to obtain a fault signal of the frequency converter INV1;

[0036] The second intermediate relay K2 is electrically connected to the inverter INV1 to obtain an operating signal of the inverter INV1.

[0037] Specifically, when the PLC output signal is allowed, the inverter INV1 has no fault, the line is self-locked, and the coil of the first intermediate relay K1 is connected; the PLC output signal is allowed, and the inverter INV1 running signal connects the coil of the first intermediate relay K2.

[0038] Further, for the solution of "control module 2 for controlling the first contactor KM1, the second contactor KM2 and the inverter INV1" mentioned above, a possible implementation is given below:

[0039] First, the control module 2 uses a programmable logic controller (PLC)

[0040] The controller (PLC for short) controls the first intermediate relay K1 to de-energize the second intermediate relay K2, thereby controlling the first contactor KM1, the second contactor KM2 and the inverter INV1. Specifically, the auxiliary contact of the first contactor is connected to the second intermediate relay K2.

[0041] Continue to refer to Figure 2 , the brake module also includes: an input reactor L1 and a fuse F1;

[0042] The input reactor L1 and the fuse F1 are connected in series with the first contactor KM1; the fuse F1 is connected in series with the inverter INV1.

[0043] Further, when the circuit is disconnected, if the first brake YB1 and the second brake YB2 are in normal states, the first brake YB1 and the second brake YB2 brake the main shaft of the motor M1; or,

[0044] If the first brake YB1 is in normal state, the first brake YB1 brakes the main shaft of the motor M1; or,

[0045] If the second brake YB2 is in normal state, the second brake YB2 will brake the main shaft of the motor M1.

[0046] Among them, for the status of the first brake YB1 and the second brake YB2, the signal is collected by going to the PLC signal, and the collected data draws the conclusion that when the PLC does not execute the K1 energization command, the PLC will not feedback the connection indication of the KM1 contact, indicating that the first brake YB1 is normal, and the same is true for the second brake YB2.

[0047] Specifically, the two components, input reactor L1 and fuse F1, do not need to be controlled and can be connected to the power grid. The input reactor L1 limits the current impact caused by sudden voltage changes in the power grid and operational overvoltage, effectively protects the inverter, improves the power factor of the inverter, and suppresses the harmonic current effect of the inverter input power grid; the function of fuse F1 is to quickly cut off the fault current when a current fault occurs, prevent the accident from expanding, and thus ensure the safe operation of the inverter.

[0048] Specifically, the embodiments of the present invention can realize double insurance on hardware, such as Figure 2 As shown, there are two brakes YB1 and YB2 controlling a mechanism at the same time. The YB1 and YB2 dual brakes brake the main shaft of the motor M1 at the same time. When one brake fails, the other brake can brake the main shaft of the motor M1 to prevent the lifting equipment from continuing to slide down. When one of the brakes has a problem, it can be recorded in the alarm record of the equipment through the PLC, and the alarm reminds the maintenance personnel to replace the brake. Specifically, the alarm is recorded on the touch screen of the monitoring device through the back-end PLC, and the communication between the PLC and the touch screen is realized.

[0049] Continue to see Figure 2 , the brake module further comprises: a main circuit breaker QM1, a first circuit breaker QM2 and a second circuit breaker QM3;

[0050] Among them, the main circuit breaker QM1 is connected in series with the first contactor KM1 to control the circuit switch of the motor M1; the first circuit breaker QM2 is connected in series with the second contactor KM2 and the first brake YB1 to control the circuit switch of the first brake YB1; the second circuit breaker QM3 is connected in series with the second contactor KM2 and the second brake YB2 to control the circuit switch of the second brake YB2.

[0051] Specifically, QM1 is a main circuit breaker for controlling the lifting equipment mechanism, QM2 is a circuit breaker with a thermal relay function for controlling YB1, and QM3 is a circuit breaker with a thermal relay function for controlling YB2.

[0052] It should be noted that Figure 2 CV11-L1 and CV11-L2 are line number identifiers for the control power supply, which are only used as an implementation example for explanation. When implementing the specific solution, it is not limited to this connection form.

[0053] The software control circuit of the embodiment of the present invention can cooperate to realize the double insurance function, such as Figure 2, the main contact 2, 4, 6 of the first contactor KM1 is connected to the main contact 1, 3, 5 of the second contactor KM2, which is a series main control circuit, which plays a double insurance role in the control circuit. When the main contact of the first contactor KM1 is stuck, the mechanical part is blocked, etc., the main contact of the second contactor KM2 can disconnect the circuit. On the contrary, when the main contact of the second contactor KM2 is stuck, the main contact of the first contactor KM1 can disconnect the circuit, thus playing a double insurance role. When the circuit is disconnected, the brake is in a closed state, which can effectively prevent the objects hoisted by the lifting equipment from continuing to slide down when the brake fails. When the main contact is stuck, the mechanical part is blocked, etc., the fault is recorded by the PLC in the alarm record of the equipment, and the alarm reminds the maintenance personnel to replace the new KM1 and KM2.

[0054] The dual insurance settings of brake hardware and software greatly reduce the safety failure rate of the brake, save maintenance costs and improve the economic benefits of the enterprise.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A safety protection circuit device for a lifting equipment brake, characterized in that: include: Braking module and control module; Wherein, the braking module comprises: a first contactor, a second contactor, a first brake, a second brake, a frequency converter and a motor; The frequency converter is electrically connected to the motor; the first contactor is electrically connected to the frequency converter and the second contactor respectively; the second contactor is electrically connected to the first brake and the second brake respectively; the first brake and the second brake are electrically connected to the motor respectively; When the main contact of the first contactor is stuck, the main contact of the second contactor disconnects the circuit; or, when the main contact of the second contactor is stuck, the main contact of the first contactor disconnects the circuit; When in the circuit-off state, the first brake and / or the second brake brakes the main shaft of the motor; The control module is electrically connected to the first contactor, the second contactor and the frequency converter respectively; The control module is used to control the first contactor, the second contactor and the frequency converter; The control module includes: a first intermediate relay, a second intermediate relay, a rising limit protection switch and a limit position bypass switch; Wherein, the rising limit protection switch is connected in parallel with the bypass conversion switch of the limit position; the rising limit protection switch and the bypass conversion switch of the limit position are connected in series with the first intermediate relay; the first intermediate relay is connected in series with the first contactor; The first intermediate relay is electrically connected to the frequency converter to obtain a fault signal of the frequency converter; The second intermediate relay is electrically connected to the frequency converter to obtain the frequency converter operation signal; The braking module further includes: an input reactor and a fuse; The input reactor and the fuse are connected in series with the first contactor; the fuse is connected in series with the frequency converter.

2. The safety protection circuit device for the lifting equipment brake according to claim 1, characterized in that: When in the circuit-off state, if the first brake and the second brake are in normal states, the first brake and the second brake brake the main shaft of the motor; Or, if the first brake is in a normal state, the first brake brakes the main shaft of the motor; Alternatively, if the second brake is in a normal state, the second brake brakes the main shaft of the motor.

3. The safety protection circuit device for the lifting equipment brake according to claim 1, characterized in that: The brake module further includes: a main circuit breaker, a first circuit breaker, and a second circuit breaker; Among them, the main circuit breaker is connected in series with the first contactor to control the circuit switch of the motor; the first circuit breaker is connected in series with the second contactor and the first brake to control the circuit switch of the first brake; the second circuit breaker is connected in series with the second contactor and the second brake to control the circuit switch of the second brake.

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