Automatic control spraying dust-settling system for coal mine rubber belt conveyor transfer point

Abstract

The utility model belongs to coal mine dust removal technical field, aims at solving the problem that cannot carry out sustained accurate regulation and control spray according to actual coal carrying capacity. Provide a kind of automatic control spray dust fall system for coal mine belt conveyor transfer point, it includes: current transformer, current detection controller, intermediate relay, solenoid valve, spray and DC stabilized power supply;Current transformer is used to collect main drive motor high voltage switch current signal and carries out ratio conversion;The secondary side wiring terminal of current transformer is connected with the signal input end of N current detection controllers, and the action threshold of the signal output end of N current detection controllers increases gradually;The signal output end of each current detection controller is connected with the coil of one intermediate relay, and the normally open contact of any intermediate relay is connected with one solenoid valve in series, and any solenoid valve is corresponding with one spray. The application can control the number of spray at transfer point in real time according to the coal carrying capacity of belt conveyor.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine dust removal technology, specifically relating to an automatic control spray dust suppression system for transfer points of coal mine belt conveyors. Background Technology

[0002] In the coal mining process, raw coal mined from the working face needs to be transferred to the surface coal bunker via multiple belt conveyors. During the transfer process, due to the height difference between the two belts, the raw coal on the belts is thrown and collides with the buffer facilities such as the coal flow plate and coal retaining plate of the preceding belt conveyor, generating a large amount of coal dust, which seriously affects the safety of the underground working environment.

[0003] Currently, the spray devices at each transfer point of the belt conveyor are manually controlled by shut-off valves in the spray water supply pipeline to open and close the spray. This control method cannot be continuously and accurately adjusted according to the actual coal transport volume, making it difficult to meet the production needs of large-scale and complex mines. Utility Model Content

[0004] In order to solve at least one of the above-mentioned technical problems in the prior art, this utility model provides an automatic control spray dust suppression system for transfer points of coal mine belt conveyors.

[0005] This utility model is achieved by the following technical solution: an automatic control spray dust suppression system for transfer points of coal mine belt conveyors, comprising: a current transformer, a current detection controller, an intermediate relay, a solenoid valve, a spray system, and a DC regulated power supply; The current transformer is installed in the high-voltage control switch cabinet of the main drive motor of the belt conveyor, and is used to collect the high-voltage switch current signal of the main drive motor and perform ratio conversion. The secondary side terminals of the current transformer are connected to the signal input terminals of N current detection controllers, and the action threshold of the signal output terminals of the N current detection controllers increases sequentially. The signal output terminal of each current detection controller is connected to the coil of an intermediate relay. The normally open contact of any intermediate relay is connected in series with the working coil of a solenoid valve. Each solenoid valve corresponds to a spray and is installed on the mist outlet pipe of the spray. The DC regulated power supply is electrically connected to the intermediate relay and the solenoid valve to provide regulated power.

[0006] Preferably, the IN+ pin of the first current detection controller is connected to the secondary side terminal 1S1 of the current transformer, the IN- pin of the first current detection controller is connected to the IN+ pin of the second current detection controller, the IN- pin of the second current detection controller is connected to the IN+ pin of the third current detection controller, and so on, until the Nth current detection controller. The IN- pin of the Nth current detection controller is connected to the secondary side terminal 1S2 of the current transformer and grounded.

[0007] Preferably, the DC+ pins of the N current detection controllers are connected in parallel and connected to the positive terminal of the output of the DC regulated power supply, and the DC- pins of the N current detection controllers are connected in parallel and connected to the negative terminal of the output of the DC regulated power supply. The COM pins of N current detection controllers are connected in parallel and connected to the negative terminal of the DC regulated power supply output. The coil of a corresponding intermediate relay is connected between the COM pin of each current detection controller and the output terminal of the DC regulated power supply. The NO pins of N current detection controllers are connected in parallel and connected to the positive terminal of the DC regulated power supply output.

[0008] Preferably, the DC regulated power supply is a mining explosion-proof and intrinsically safe DC regulated power supply with an input of 127V AC and an output of 24V DC; the first terminals of the normally open contacts of the N intermediate relays are respectively connected to the black wire of the working coil of the corresponding solenoid valve, the second terminals of the normally open contacts of the N intermediate relays are connected in parallel and connected to the L terminal of the 127V AC, and the red wires of the working coils of the N solenoid valves are connected in parallel and connected to the N terminal of the 127V AC.

[0009] Preferably, N spray nozzles are spaced above the transfer point of the belt conveyor via high-pressure hoses and fixed frames, and the main pipeline containing the spray nozzles is equipped with a shut-off valve and a filter for filtering impurities.

[0010] Preferably, the current transformer is model LMZ-10, the current detection controller is model YEL7-B, the intermediate relay is model JZX-22F, the solenoid valve is model DFB-20, and the DC regulated power supply is model KDW127 / 24B.

[0011] Compared with the prior art, the beneficial effects of this utility model are: The automatic spray control system of this utility model has a simple structure, low cost, and is easy to install. The system is stable and reliable and is suitable for all transfer points of coal mine belt conveyors. It can not only improve dust suppression efficiency, but also effectively reduce the amount of water brought into the coal bunker by the belt.

[0012] This automatic spray control system has a wide range of applications and is suitable for all transfer points in the mining transportation process. It can dynamically control the spraying frequency at transfer points in real time based on the amount of coal transported by the belt conveyor. It avoids the drawbacks of spraying not being activated when there is coal on the belt or spraying being continuously activated when there is no coal on the belt, due to human error. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is the electrical schematic diagram of the automatic spray control system of this utility model.

[0015] Figure 2 This is the control flowchart of the automatic spray control system of this utility model. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should fall within the scope of the technical content disclosed in this utility model. It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0018] This utility model provides an embodiment: An automatic control spray dust suppression system for coal mine belt conveyor transfer points is disclosed. The core control concept of this system is to dynamically control the amount of spray applied above the transfer point by real-time monitoring of the coal load on the belt conveyor, thereby effectively controlling coal dust. This automatic control spray system is part of the automation and intelligentization of coal mines, capable of 24-hour uninterrupted adjustment based on changes in the coal load on the belt conveyor, thus effectively responding to changes in coal dust concentration at the transfer point. The system includes: a current transformer, a current detection controller, an intermediate relay, a solenoid valve, a spray system, and a DC regulated power supply. The current transformer is installed in the high-voltage control switch cabinet of the main drive motor of the belt conveyor, used to collect the high-voltage switch current signal of the main drive motor and perform ratio conversion. The secondary side terminals of the current transformer are connected to the signal input terminals of N current detection controllers, and the action thresholds of the signal output terminals of the N current detection controllers increase sequentially. Each current detection controller's signal output terminal is connected to the coil of an intermediate relay. The normally open contact of any intermediate relay is connected in series with the working coil of a solenoid valve. Each solenoid valve corresponds to a spray nozzle and is installed on the mist outlet pipe of the spray system. The DC regulated power supply is electrically connected to the intermediate relays and solenoid valves to provide regulated power.

[0019] The core control variable of this automatic spray control system is the amount of coal transported by the belt conveyor. In actual operation, this variable is difficult to detect directly, requiring a more easily detectable variable that is positively correlated with it. Through field research, we found that the amount of coal transported by the belt conveyor is positively correlated with the high-voltage switch current signal of the main drive motor driving the conveyor. This high-voltage switch current signal can be obtained by collecting the secondary current signal of the current transformer in the high-voltage control switch cabinet that controls its operation and multiplying it by the transformer's transformation ratio. Therefore, the amount of coal transported by the belt conveyor can be indirectly monitored by collecting the current signal from the secondary side of the current transformer in the high-voltage control switch cabinet of the main drive motor.

[0020] The control principle of this automatic spray control system is to transmit the current signal from the secondary side of the current transformer in the high-voltage control switch cabinet of the main drive motor of the belt conveyor to the current detection controller. When the current signal reaches the current range set by the current detection controller, the relay at the output end of the current detection controller is activated, thereby energizing the coil of the intermediate relay, which in turn energizes the coil of the solenoid valve to start spraying. Ultimately, the operating current of the main drive motor of the belt conveyor is used to control the amount of spraying above the transfer point, achieving the effect of continuous dynamic control of spray dust suppression.

[0021] In this embodiment, the current transformer is model LMZ-10, the current detection controller is model YEL7-B, the intermediate relay is model JZX-22F, the solenoid valve is model DFB-20, and the DC regulated power supply is model KDW127 / 24B.

[0022] The IN+ pin of the first current detection controller is connected to the secondary side terminal 1S1 of the current transformer. The IN- pin of the first current detection controller is connected to the IN+ pin of the second current detection controller. The IN- pin of the second current detection controller is connected to the IN+ pin of the third current detection controller, and so on, until the Nth current detection controller. The IN- pin of the Nth current detection controller is connected to the secondary side terminal 1S2 of the current transformer and grounded. N is 3. The three sprayers are spaced above the transfer point of the belt conveyor by high-pressure hoses and fixing frames. The main pipeline where the sprayers are located is equipped with a shut-off valve and a filter for filtering impurities.

[0023] The DC+ pins of the three current sensing controllers are connected in parallel and to the positive terminal of the DC regulated power supply output; the DC- pins of the three current sensing controllers are connected in parallel and to the negative terminal of the DC regulated power supply output; the COM pins of the three current sensing controllers are connected in parallel and to the negative terminal of the DC regulated power supply output; and the coil of a corresponding intermediate relay is connected between the COM pin of each current sensing controller and the output terminal of the DC regulated power supply; the NO pins of the three current sensing controllers are connected in parallel and to the positive terminal of the DC regulated power supply output.

[0024] The DC regulated power supply is a mine-use explosion-proof and intrinsically safe DC regulated power supply with an input of 127V AC and an output of 24V DC. The first terminal of the normally open contact of the three intermediate relays is connected to the black wire of the working coil of the corresponding solenoid valve. The second terminal of the normally open contact of the three intermediate relays is connected in parallel to the L terminal of the 127V AC power supply. The red wire of the working coil of the three solenoid valves is connected in parallel to the N terminal of the 127V AC power supply.

[0025] Combination Figure 1 , Figure 2 The process of acquiring the current signal on the secondary side of the current transformer is as follows: 1. Signal Acquisition: A signal line is led out from the secondary side terminals (1S1, 1S2) of the current transformer inside the high-voltage switchgear of the main drive motor to acquire the high-voltage switch current signal of the main drive motor. This yields an AC current of 0-5A. Multiplying this current by the current transformer's transformation ratio gives the operating current of the belt conveyor's main drive motor. The transformation ratio calculation is a built-in technology of the current transformer and is existing technology.

[0026] 2. Signal reception: Connect the other end of the signal line to the detection signal terminal (IN+, IN-) of the current detection controller. This enables the reception of the current signal, preparing the current detection controller to control the intermediate relay.

[0027] The working principle of the current detection controller is as follows: 1. As the coal carrying capacity of the belt conveyor increases, the power of the main motor driving it also increases. According to P=U As can be seen from I, when the voltage is constant, the current is directly proportional to the power. Therefore, the operating current of the main drive motor also increases, and the current through the high-voltage switchgear of the main motor will also increase accordingly. At the same time, the current induced on the secondary side of the current transformer will also increase proportionally.

[0028] Through extensive statistical analysis of the high-voltage switch current signals of the main drive motor corresponding to different coal loads of the underground belt conveyor, it was found that when the belt conveyor is fully loaded with coal, the current of the main motor high-voltage switch is between 26A and 38A, which is called the "high coal" state; when the current of the main motor high-voltage switch is between 17A and 26A, it is called the "normal" state; when the current of the main motor high-voltage switch is between 13A and 17A, it is called the "low coal" state; and when the current of the main motor high-voltage switch is between 6A and 13A, it is called the "no coal" state.

[0029] The current transformer ratio of the high-voltage switchgear for the main drive motor of the underground belt conveyor in the coal mine is 50 / 5. Therefore, the input current range of the signal detection terminal of the current detection controller can be calculated as follows: 2.6A~3.8A under heavy coal conditions; 1.7~2.6A under normal conditions; 1.3A~1.7A under light coal conditions; and 0.6A~1.3A under no coal conditions.

[0030] 2. The activation thresholds for the output terminals of current detection controllers #1, #2, and #3 are set to 1.3A, 1.7A, and 2.6A, respectively. The threshold settings within the current detection controllers are existing technology and will not be elaborated here. When the belt conveyor is in a coal-free state, the input current at the signal detection terminal of the current detection controller is 0.6A~1.3A. At this time, all output terminals of the current detection controllers are inactive, and all sprays are not working. When the belt conveyor is in a low-coal state, the input current at the signal detection terminal of the current detection controller is 1.3A~1.7A. At this time, the output terminal of current detection controller #1 activates, energizing the coil of intermediate relay #1 (KA1), thereby controlling the energization of solenoid valve #1 (YV1), and spray #1 begins to work. When the belt conveyor is in a normal state, the input current at the signal detection terminal of the current detection controller is 1.7A~2.6A. At this time, the output terminals of current detection controllers #1 and #2... When the output of the detection controller is activated, the coils of intermediate relays #1 and #2 (KA1 and KA2) are energized and engaged, thereby controlling the solenoid valves #1 and #2 (YV1 and YV2) to be energized and engaged, and sprayers #1 and #2 begin to operate. When the belt conveyor is in a coal-filled state, the input current of the signal detection terminal of the current detection controller is 2.6A~3.8A. At this time, the outputs of current detection controllers #1, #2, and #3 are activated, energizing the coils of intermediate relays #1, #2, and #3 (KA1, KA2, and KA3), thereby controlling the solenoid valves #1, #2, and #3 (YV1, YV2, and YV3) to be energized and engaged, and sprayers #1, #2, and #3 begin to operate.

[0031] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An automatic control spray dust suppression system for transfer points of coal mine belt conveyors, characterized in that, include: Current transformers, current detection controllers, intermediate relays, solenoid valves, spray systems, and DC regulated power supplies; The current transformer is installed in the high-voltage control switch cabinet of the main drive motor of the belt conveyor, and is used to collect the high-voltage switch current signal of the main drive motor and perform ratio conversion. The secondary side terminals of the current transformer are connected to the signal input terminals of N current detection controllers, and the action threshold of the signal output terminals of the N current detection controllers increases sequentially. The signal output terminal of each current detection controller is connected to the coil of an intermediate relay. The normally open contact of any intermediate relay is connected in series with the working coil of a solenoid valve. Each solenoid valve corresponds to a spray and is installed on the mist outlet pipe of the spray. The DC regulated power supply is electrically connected to the intermediate relay and the solenoid valve to provide regulated power.

2. The automatic control spray dust suppression system for transfer points of coal mine belt conveyors according to claim 1, characterized in that: The IN+ pin of the first current detection controller is connected to the secondary side terminal 1S1 of the current transformer. The IN- pin of the first current detection controller is connected to the IN+ pin of the second current detection controller. The IN- pin of the second current detection controller is connected to the IN+ pin of the third current detection controller, and so on, until the Nth current detection controller. The IN- pin of the Nth current detection controller is connected to the secondary side terminal 1S2 of the current transformer and grounded.

3. The automatic control spray dust suppression system for transfer points of coal mine belt conveyors according to claim 2, characterized in that: The N DC+ pins of the current detection controllers are connected in parallel and connected to the positive terminal of the output of the DC regulated power supply; the N DC- pins of the current detection controllers are connected in parallel and connected to the negative terminal of the output of the DC regulated power supply. The COM pins of N current detection controllers are connected in parallel and connected to the negative terminal of the DC regulated power supply output. The coil of a corresponding intermediate relay is connected between the COM pin of each current detection controller and the output terminal of the DC regulated power supply. The NO pins of N current detection controllers are connected in parallel and connected to the positive terminal of the DC regulated power supply output.

4. The automatic control spray dust suppression system for transfer points of coal mine belt conveyors according to claim 1, characterized in that: The DC regulated power supply is a mining explosion-proof and intrinsically safe DC regulated power supply with an input of 127V AC and an output of 24V DC. The first terminals of the normally open contacts of the N intermediate relays are respectively connected to the black wire of the working coil of the corresponding solenoid valve. The second terminals of the normally open contacts of the N intermediate relays are connected in parallel and connected to the L terminal of the 127V AC power supply. The red wires of the working coils of the N solenoid valves are connected in parallel and connected to the N terminal of the 127V AC power supply.

5. The automatic control spray dust suppression system for transfer points of coal mine belt conveyors according to claim 1, characterized in that: N spray nozzles are spaced above the transfer point of the belt conveyor via high-pressure hoses and fixed frames. The main pipeline containing the spray nozzles is equipped with a shut-off valve and a filter for filtering impurities.

6. The automatic control spray dust suppression system for transfer points of coal mine belt conveyors according to claim 1, characterized in that: The current transformer is model LMZ-10, the current detection controller is model YEL7-B, the intermediate relay is model JZX-22F, the solenoid valve is model DFB-20, and the DC regulated power supply is model KDW127 / 24B.

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