Crown block insulation monitoring system

Abstract

The utility model relates to a crown block insulation monitoring system in the insulation detection technology field, comprising an insulation detector, a PLC controller, a relay group and a conduction loop, the insulation detector comprises a measuring end E and a measuring end N / HV, the measuring end E and the measuring end N / HV can be used for measuring resistance value and voltage value, two ends of the conduction loop are provided with first conduction switches, and the first conduction switches are connected with the PLC controller. The two ends of the conduction loop are electrically connected with the measuring end E and the measuring end N / HV of the insulation detector through the first conduction switch respectively, the control switch sets are connected in parallel in the middle of the conduction loop, and the PLC is matched with the conduction loop to enable the measuring end E and the measuring end N / HV of the insulation detector and insulators of the crown blocks to be connected in parallel one by one. And the relay groups are controlled to be opened and closed one by one through the PLC, so that automatic crown block insulation monitoring inspection is realized, the insulation performance of the crown block is effectively monitored, and high efficiency and safety in detection are achieved.

Description

Technical Field

[0001] This utility model relates to the field of insulation detection technology, specifically to an insulation monitoring system for overhead cranes. Background Technology

[0002] A bridge crane, also known as an overhead crane, is a type of crane whose bridge structure runs on elevated tracks. The bridge of the bridge crane moves longitudinally along tracks laid on both sides of the elevated structure, while the trolley moves laterally along tracks laid on the bridge, forming a rectangular working area. This allows for full utilization of the space beneath the bridge for lifting and transporting materials without obstruction from ground equipment. This type of crane is widely used in indoor and outdoor warehouses, factories, docks, and open-air storage yards.

[0003] Traditional multi-functional overhead crane insulation leakage monitoring requires manual inspection, which suffers from low detection efficiency, poor accuracy, and inability to provide real-time monitoring, making it difficult to meet the stringent safety requirements of modern industrial production. Furthermore, the operating environment of equipment in the electrolytic non-ferrous metals industry is often harsh, with high humidity and dust levels, which can shorten equipment lifespan. Poor insulation can lead to short circuits between conductors at different potentials, resulting in significant economic losses and safety hazards. Therefore, there is an urgent need to develop an overhead crane insulation monitoring system to meet practical application needs. Utility Model Content

[0004] The purpose of this invention is to provide an overhead crane insulation monitoring system to address the aforementioned deficiencies.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An overhead crane insulation monitoring system includes an insulation detector, a PLC controller, a relay group, and a continuity circuit. The insulation detector includes a measuring terminal E and a measuring terminal N / HV, which can be used to measure resistance and voltage values. The PLC controller includes several signal output terminals. The relay group includes several coil terminals and several switch terminals. The coil terminals are electrically connected to the signal output terminals of the PLC controller. The switch terminals consist of two output switches forming a control switch group, which is used to connect to an external insulator. Each end of the continuity circuit is equipped with a first continuity switch, which electrically connects the two ends of the continuity circuit to the measuring terminal E and the measuring terminal N / HV of the insulation detector, respectively. Several control switch groups are connected in parallel in the middle of the continuity circuit.

[0007] As a further solution, as described above, a second conducting switch is provided between the first conducting switch and the control switch group on the side near the measuring end E of the insulation tester.

[0008] As a further solution, as described above, a third switch is provided between the first on switch and the control switch group near the N / HV side of the measurement end.

[0009] As a further embodiment of the above description, a grounding circuit is provided on the side of the conducting circuit near the measuring end E. A grounding switch is provided in the middle of the grounding circuit. One end of the grounding circuit is connected in parallel between the first conducting switch and the second conducting switch, and the other end of the grounding circuit is used for grounding.

[0010] As a further embodiment of the above description, a transformer circuit is provided on the side of the conducting circuit near the measuring terminal E, and a neutral point switch is provided in the middle of the grounding circuit. One end of the transformer circuit is connected in parallel between the first conducting switch and the second conducting switch, and the other end of the transformer circuit is used to connect to the transformer neutral point.

[0011] As a further solution, as described above, the touch screen, insulation detector, and PLC controller are all powered by a low-voltage DC 24V power supply.

[0012] As a further solution, as described above, the insulation tester and the PLC controller are electrically connected via the RS485 communication protocol.

[0013] The beneficial effects of this utility model are as follows:

[0014] This application discloses an overhead crane insulation monitoring system. By using a PLC controller and a conduction circuit, the measuring terminals E and N / HV of the insulation detector are connected in parallel with the insulators of several overhead cranes one by one. The PLC controller controls the coil terminals of the relay groups one by one, thereby realizing automated overhead crane insulation monitoring and inspection. This system effectively monitors the insulation performance of the overhead crane and has both high efficiency and safety in detection. Attached Figure Description

[0015] Figure 1 This is a wiring diagram of the overhead crane insulation monitoring system described in this utility model;

[0016] Figure 2 This is a schematic diagram of the overhead crane insulation monitoring system described in this utility model in the measurement of insulation resistance;

[0017] Figure 3 This is a schematic diagram of the overhead crane insulation monitoring system described in this utility model in measuring parasitic charges;

[0018] Figure 4 This is a schematic diagram of the overhead crane insulation monitoring system described in this utility model in leakage current measurement;

[0019] Figure 5 This is a schematic diagram of the overhead crane insulation monitoring system described in this utility model during electrostatic discharge;

[0020] In the diagram: Y0, Y1-Yn, and Yn+1 are output switches, Y31 is a grounding switch, Y30 is a neutral point switch (transformer), Y34 and Y35 are the first conducting switches, Y32 is the second conducting switch, and Y33 is the third conducting switch. Detailed Implementation

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0022] Please see Figure 1-5 The specific implementation of the overhead crane insulation monitoring system includes an insulation detector, a touch screen, a PLC controller, a relay group and a continuity circuit. The touch screen, insulation detector and PLC controller are all powered by a low-voltage DC 24V power supply. The insulation detector and PLC controller are electrically connected via RS485 communication protocol.

[0023] The insulation tester includes a measuring terminal E and a measuring terminal N / HV, which can be used to measure resistance and voltage values. The PLC controller includes several groups of signal output terminals. The relay group includes several coil terminals and several switch terminals. The coil terminals are electrically connected to the signal output terminals of the PLC controller. The switch terminals consist of two output switches forming a control switch group, which is used to connect to an external insulator. Each end of the conduction circuit is equipped with a first conduction switch. The two ends of the conduction circuit are electrically connected to the measuring terminal E and the measuring terminal N / HV of the insulation tester through the first conduction switches. Several control switch groups are connected in parallel in the middle of the conduction circuit.

[0024] By using a PLC controller in conjunction with a conduction circuit, the measuring terminals E and N / HV of the insulation tester are connected in parallel with the insulators of several overhead cranes one by one. The PLC controller then controls the coil terminals of the relay groups one by one, thereby realizing automated overhead crane insulation monitoring and inspection. This effectively monitors the insulation performance of the overhead cranes and has both high efficiency and safety in the detection process.

[0025] Preferably, a second conducting switch is provided between the first conducting switch and the control switch group on the side near the measuring end E of the insulation tester, and a third conducting switch is provided between the first conducting switch and the control switch group on the side near the measuring end N / HV. A grounding circuit is also provided on the side of the conducting circuit near the measuring end E. A grounding switch is provided in the middle of the grounding circuit. One end of the grounding circuit is connected in parallel between the first conducting switch and the second conducting switch, and the other end of the grounding circuit is used for grounding. A transformer circuit is also provided on the side of the conducting circuit near the measuring end E. A neutral point switch is provided in the middle of the grounding circuit. One end of the transformer circuit is connected in parallel between the first conducting switch and the second conducting switch, and the other end of the transformer circuit is used to connect to the transformer neutral point.

[0026] A crane insulation monitoring system, when measuring insulation resistance, such as Figure 2 As shown, the PLC controller controls the closure of the first conducting switches Y34 and Y35, and simultaneously controls the closure of the second conducting switch Y32. Then, it controls each group of control switches, such as Y0 and Y1, so that the measuring terminals E and N / HV of the insulation detector can detect the insulation resistance of the overhead crane's insulators. The controller then sequentially closes the previous group of control switches and opens the next group of control switches.

[0027] A crane insulation monitoring system, when measuring parasitic charges, such as Figure 3 As shown, the PLC controller controls the closure of the first conducting switches Y34 and Y35, and simultaneously controls the closure of the third conducting switch Y33 and the grounding switch Y31, thus connecting the grounding circuit to the measuring terminal E of the insulation detector. Then, the output switches Y0, Y1 to Yn are sequentially controlled to close, allowing the measuring terminals E and N / HV of the insulation detector to measure the parasitic charge between the insulator and the grounding terminal, respectively.

[0028] When the parasitic charge between the insulator and the grounding terminal exceeds a set threshold, an electrostatic discharge function can be activated through an overhead crane insulation monitoring system, such as... Figure 5 As shown, the PLC controller controls the second conducting switch Y32 to close, and at the same time controls the grounding switch Y31 to close, so that the grounding circuit and the conducting circuit are electrically connected. Then, according to the location of the detected parasitic charge, the corresponding output switch is closed, thereby releasing the parasitic charge through the grounding circuit.

[0029] A crane insulation monitoring system, when measuring leakage current, such as Figure 4As shown, the PLC controller controls the closure of the first conducting switches Y34 and Y35, and simultaneously controls the closure of the third conducting switch Y33 and the neutral point switch Y30, thus connecting the transformer circuit to the measuring terminal E of the insulation detector. Then, the output switches Y0, Y1 to Yn are closed sequentially, allowing the measuring terminals E and N / HV of the insulation detector to measure the parasitic charge between the insulator and the transformer, thereby determining whether leakage exists.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A crown block insulation monitoring system, characterized by, The utility model relates to an insulation detection instrument, and more particularly to an insulation detection instrument with a PLC controller. The insulation detection instrument comprises a measuring end E and a measuring end N / HV, which can be used to measure resistance and voltage values. The PLC controller comprises a plurality of group signal output ends. The relay group comprises a plurality of coil ends and a plurality of switch ends, the coil ends are electrically connected to the signal output ends of the PLC controller respectively, and the switch ends are connected to the external insulator through the control switch group. The on-circuit comprises a first on-switch at each end, and the two ends of the on-circuit are electrically connected to the measuring end E and the measuring end N / HV of the insulation detection instrument through the first on-switches respectively.

2. The crown block insulation monitoring system of claim 1, wherein: The first on-switch near the measuring end E and the control switch group are further connected by a second on-switch.

3. The crown block insulation monitoring system of claim 2, wherein: The first on-switch near the measuring end N / HV and the control switch group are further connected by a third on-switch.

4. The crown block insulation monitoring system of claim 3, wherein: The on-circuit near the measuring end E is further connected to a grounding circuit, the grounding circuit comprises a grounding switch at the middle part, one end of the grounding circuit is connected between the first on-switch and the second on-switch in parallel, and the other end of the grounding circuit is used for grounding.

5. The crown block insulation monitoring system of claim 3, wherein: The on-circuit near the measuring end E is further connected to a transformer circuit, the transformer circuit comprises a neutral point switch at the middle part, one end of the transformer circuit is connected between the first on-switch and the second on-switch in parallel, and the other end of the transformer circuit is used for connecting the neutral point of the transformer.

6. The crown block insulation monitoring system according to any one of claims 1 to 5, characterized in that: The utility model further comprises a touch screen, and the touch screen, the insulation detection instrument and the PLC controller are powered by a low-voltage direct-current 24V power supply.

7. The crown block insulation monitoring system according to any one of claims 1 to 5, characterized in that: The insulation detection instrument and the PLC controller are electrically connected through the RS485 communication protocol.

Images