Auxiliary power supply protection device for mining multi-loop vacuum electromagnetic starter

Abstract

The utility model discloses a mining multi-loop vacuum electromagnetic starter auxiliary power supply protection device, comprising an intermediate relay, an AC contactor electrically connected with the intermediate relay, and a sampling mutual inductor used for signal sampling, the AC contactor and the sampling mutual inductor are respectively electrically connected with a sampling signal processing board; and the intermediate relay, the alternating current contactor and the sampling signal processing board are electrically connected with a controller. According to the utility model, signal sampling is carried out through the sampling mutual inductor, sampling signals are processed through the sampling signal processing board and controlled by the controller, and the controller controls connection and disconnection of the alternating current contactor by controlling the intermediate relay, so that control and protection of 220V and 127V auxiliary power supplies are realized, strong current is controlled by controlling weak current, and the control of the alternating current contactor is realized. The device has the characteristics of safety, stable and reliable performance, convenient installation and maintenance and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine automation, in particular to an auxiliary power supply protection device for a multi-circuit vacuum electromagnetic starter used in a mine. Background Art

[0002] With the development of coal mine automation technology, more and more coal mine enterprises require combination switches to add lighting and signal power supply systems in order to provide reliable power supply and protection for the operation of certain peripheral communication, lighting and other equipment. Among them, the multi-circuit vacuum electromagnetic starter for mining is one of the key equipment in the underground power supply system of coal mines. Its working reliability directly affects the production of coal mines and the safety of the power supply system.

[0003] The multi-circuit vacuum electromagnetic starter for mining can control the on and off of the AC contactor. The three phase wires (live wires) are connected to the upper terminal of the main contact of the AC contactor, and the lower terminal of the main contact of the AC contactor is connected to the load. The multi-circuit vacuum electromagnetic starter for mining contains a comprehensive control switch including AC contactor, thermal relay, button and programmable controller. The internal control circuit and the above components have overload and short circuit protection functions.

[0004] However, the existing multi-circuit vacuum electromagnetic starter for mining can only provide control and protection for 127V power supply, and cannot meet the needs of 220V and 127V auxiliary power supply control and protection in coal mines. Summary of the invention

[0005] In order to solve the above technical problems, the utility model proposes the following technical solutions:

[0006] An embodiment of the utility model provides an auxiliary power supply protection device for a multi-circuit vacuum electromagnetic starter for mining, comprising an intermediate relay, an AC contactor electrically connected to the intermediate relay, and a sampling transformer for signal sampling, wherein the AC contactor and the sampling transformer are electrically connected to a sampling signal processing board respectively, and the intermediate relay, the AC contactor and the sampling signal processing board are all electrically connected to a controller.

[0007] In a possible implementation, the intermediate relay, the AC contactor, and the sampling transformer are provided in multiple groups, and different groups correspond to different circuits.

[0008] In a possible implementation, the sampling signal processing board includes a current sampling module and a leakage sampling module, the current sampling module is electrically connected to the sampling transformer, and the leakage sampling module is electrically connected to the AC contactor.

[0009] In a possible implementation, the controller is a PLC controller, which includes a central processing unit, an RS485 communication module, a digital input module, a digital output module, an analog input module and an Ethernet communication module.

[0010] In a possible implementation, the output end of the digital output module is electrically connected to the signal input end of the intermediate relay, and the output end of the digital output module is used to send an action signal to the intermediate relay.

[0011] In a possible implementation, the signal output end of the AC contactor is electrically connected to the input end of the digital quantity input module, and the signal output end of the AC contactor is used to send a feedback signal to the digital quantity input module.

[0012] In a possible implementation, the output end of the sampling signal processing board is electrically connected to the input end of the analog input module.

[0013] The utility model samples signals through a sampling mutual inductor, uses a sampling signal processing board to process the sampled signals, and is controlled by a controller. The controller controls the closing and disconnecting of the AC contactor by controlling an intermediate relay to achieve control and protection of 220V and 127V auxiliary power supplies, controls strong electricity by controlling weak electricity, and has the characteristics of safety, stable and reliable performance, and easy installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of an auxiliary power supply protection device for a multi-circuit vacuum electromagnetic starter for mining provided in an embodiment of the utility model;

[0015] Figure 2 A schematic diagram of the structure of a PLC controller provided in an embodiment of the utility model;

[0016] Figure 1-2 , the symbols are: 1-PLC controller, 2-sampling signal processing board, 3-sampling transformer group, 4-AC contactor group, 5-intermediate relay group, (PT1, PT2, PT3)-sampling transformer, (LK1, LK2, LK3)-AC contactor, (MK1, MK2, MK3)-intermediate relay, N1-current sampling module, N2-leakage sampling module, P0-central processing unit CPU, P1-RS485 communication module, P2-digital input module, P3-digital output module, P4-analog input module, P5-Ethernet communication module. DETAILED DESCRIPTION

[0017] The present solution is described below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 A schematic diagram of a structure of a multi-circuit vacuum electromagnetic starter auxiliary power supply protection device for mining provided by the embodiment of the utility model, see Figure 1 , the embodiment of the utility model includes an intermediate relay group 5, an AC contactor group 4 electrically connected to the intermediate relay group 5, and a sampling transformer group 3 for signal sampling, the AC contactor group 4 and the sampling transformer group 3 are electrically connected to the sampling signal processing board 2 respectively, and the intermediate relay group 5, the AC contactor group 4 and the sampling signal processing board 2 are all electrically connected to the controller 1. In this embodiment, the controller 1 is fixed on the front door plate of the multi-circuit vacuum electromagnetic starter for mining, and the sampling signal processing board 2, the sampling transformer group 3, the AC contactor group 4 and the intermediate relay group 5 are fixed in the cavity of the multi-circuit vacuum electromagnetic starter for mining.

[0019] Furthermore, there are multiple groups of intermediate relays, AC contactors and sampling transformers, and different groups correspond to different circuits. The number of auxiliary power supply circuits can be selected according to site requirements, for example, 1 220V and 3 127V, 1 220V and 2 127V, 1 220V and 1 127V, 3 127V, etc.

[0020] Further, the sampling signal processing board 2 includes a current sampling module N1 and a leakage sampling module N2, the current sampling module N1 is electrically connected to the sampling transformer group 3, in this embodiment, the sampling transformer group 3 includes three sampling transformers PT1, PT2, PT3, and the sampling transformers PT1, PT2, PT3 collect signals and give them to the current sampling module N1. The leakage sampling module N2 is electrically connected to the AC contactor group 4, in this embodiment, the AC contactor group 4 includes three AC contactors LK1, LK2, LK3, and the leakage sampling module N2 collects leakage signals from the contacts 2 of LK1, LK2, and LK3.

[0021] See also Figure 2 In this embodiment, the controller is a PLC controller, which includes a central processing unit CPU P0, an RS485 communication module P1, a digital input module P2, a digital output module P3, an analog input module P4 and an Ethernet communication module P5. The auxiliary power supply protection device can upload the current and voltage data of the auxiliary power supply to other host computers through Modbus TCP, RS485 and other communication methods.

[0022] Further, the output end of the digital quantity output module P3 is electrically connected to the signal input end of the intermediate relay group 5, and the output end of the digital quantity output module P3 is used to send an action signal to the intermediate relay group 5. The intermediate relay group 5 in this embodiment includes three intermediate relays MK1, MK2, and MK3. The central processing unit CPU P0 of the PLC controller issues a start command, and then the digital quantity output module P3 issues a switch quantity start signal to the coils of the intermediate relays MK1, MK2, and MK3, and MK1, MK2, and MK3 are attracted, and then the contacts of MK1, MK2, and MK3 are connected to the coils of the AC contactors LK1, LK2, and LK3, and LK1, LK2, and LK3 are attracted, and the auxiliary power supply protection device outputs 220V, 127V, and 127V. When it is necessary to stop, the central processing unit CPU P0 stops issuing commands, and then the digital quantity output module P3 stops issuing switch quantity signals, and the intermediate relays MK1, MK2, and MK3 are disconnected, and then the AC contactors LK1, LK2, and LK3 are disconnected.

[0023] Furthermore, the signal output end of the AC contactor group 4 is electrically connected to the input end of the digital quantity input module P2, and the signal output end of the AC contactor group 4 is used to send a feedback signal to the digital quantity input module P2. When the AC contactors LK1, LK2, and LK3 are energized, the feedback signals of the contacts 14 of LK1, LK2, and LK3 are given to the digital quantity input module P2, and the PLC controller determines whether the AC contactors LK1, LK2, and LK3 are energized according to the feedback signals. When the PLC controller issues a start command but does not receive a feedback signal, it checks the intermediate relay group 5 and the AC contactor group 4 to eliminate the fault.

[0024] Furthermore, the output end of the sampling signal processing board 2 is electrically connected to the input end of the analog input module P4. When the AC contactors LK1, LK2, and LK3 are energized, the sampling transformers PT1, PT2, and PT3 collect signals and give them to the current sampling module N1. The current sampling module N1 processes the signals collected by the sampling transformers and outputs them to the first three interfaces CH0, CH1, and CH2 of the analog input module P4. When an overload or short circuit occurs, the PLC controller stops issuing a start command, disconnects the intermediate relays MK1, MK2, and MK3, and then disconnects the AC contactors LK1, LK2, and LK3. In another case, when the AC contactors LK1, LK2, and LK3 are energized, the leakage signal is collected from contact 2 of LK1, LK2, and LK3 and given to the leakage sampling module N2. The leakage sampling module N2 processes the leakage signal and outputs it to the three-way interface CH3, CH4, and CH5 of the analog input module P4. When leakage occurs, the PLC controller stops issuing the start command, disconnects the intermediate relays MK1, MK2, and MK3, and then disconnects the AC contactors LK1, LK2, and LK3.

[0025] In the embodiments of the present invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B may be singular or plural. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0026] The above is only a specific implementation of the present invention. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. The protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-circuit vacuum electromagnetic starter auxiliary power supply protection device for mining, characterized in that: It includes an intermediate relay, an AC contactor electrically connected to the intermediate relay, and a sampling transformer for signal sampling. The AC contactor and the sampling transformer are electrically connected to a sampling signal processing board respectively, and the intermediate relay, the AC contactor and the sampling signal processing board are all electrically connected to a controller.

2. The auxiliary power supply protection device for a multi-circuit vacuum electromagnetic starter for mining according to claim 1 is characterized in that: The intermediate relay, the AC contactor and the sampling transformer are arranged in multiple groups, and different groups correspond to different circuits.

3. The auxiliary power supply protection device for a multi-circuit vacuum electromagnetic starter for mining according to claim 1 is characterized in that: The sampling signal processing board comprises a current sampling module and a leakage sampling module. The current sampling module is electrically connected to the sampling transformer, and the leakage sampling module is electrically connected to the AC contactor.

4. The auxiliary power supply protection device for a multi-circuit vacuum electromagnetic starter for mining according to claim 1 is characterized in that: The controller is a PLC controller, which includes a central processing unit, an RS485 communication module, a digital quantity input module, a digital quantity output module, an analog quantity input module and an Ethernet communication module.

5. The auxiliary power supply protection device for a multi-circuit vacuum electromagnetic starter for mining according to claim 4 is characterized in that: The output end of the digital output module is electrically connected to the signal input end of the intermediate relay, and the output end of the digital output module is used to send an action signal to the intermediate relay.

6. The auxiliary power supply protection device for a multi-circuit vacuum electromagnetic starter for mining according to claim 4 is characterized in that: The signal output end of the AC contactor is electrically connected to the input end of the digital quantity input module, and the signal output end of the AC contactor is used to send a feedback signal to the digital quantity input module.

7. The auxiliary power supply protection device for a multi-circuit vacuum electromagnetic starter for mining according to claim 4 is characterized in that: The output end of the sampling signal processing board is electrically connected to the input end of the analog input module.

Images