Local fan linkage control box with carbon monoxide detection function for underground mine

Abstract

The utility model discloses a local fan linkage control box with a carbon monoxide detection function for an underground mine, which comprises a box body, a start button, a stop button and a change-over switch are mounted on a front panel of the box body, and a main control loop and a secondary control loop are further arranged in the box body; the main control loop comprises a main contactor and a motor comprehensive protector, and the secondary control loop comprises a carbon monoxide detector and a linkage relay. By integrating the carbon monoxide detection function, the intelligent linkage control of the local fan is realized, the occurrence of carbon monoxide poisoning accidents is effectively prevented, the problem of forgetting or negligence possibly occurring in manual operation is also avoided, and the safety of mine operation is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a local fan control box. BACKGROUND

[0002] In the mining operation of metal and nonmetal mines, due to the complex operation environment and limited ventilation conditions, there is a risk of carbon monoxide (CO) accumulation in the operation area. Carbon monoxide is a colorless and odorless toxic gas, and long-term exposure or high-concentration inhalation can cause poisoning in workers, and even endanger life in severe cases. In order to ensure the air circulation of the operation area and prevent the carbon monoxide concentration from exceeding the standard, local ventilation equipment (local fan) is usually erected at the air inlet of each mining operation area to dilute and remove harmful gases in a forced ventilation manner.

[0003] At present, manual switching of local fans is commonly used for ventilation control in mine operations. Although this method can improve the air quality of the operation area to some extent, it has obvious defects: first, workers may forget to start the local fan due to negligence or busy work rhythm, leading to carbon monoxide accumulation in the operation area and causing poisoning accidents. Second, after manually starting the local fan, the worker may forget or for other reasons fail to turn off the equipment in time, causing the local fan to run for a long time, wasting a large amount of electric power energy and increasing the operating cost of the mine. SUMMARY

[0004] The utility model provides a local fan linkage control box with carbon monoxide detection function for underground mines, which aims to solve the problem of easy forgetting to turn on and off the local fan.

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

[0006] A local fan linkage control box with carbon monoxide detection function for underground mines, comprising a box body, a start button, a stop button and a change-over switch are installed on the front panel of the box body, the change-over switch includes normally open contacts and normally closed contacts with opposite states at all times; a main control circuit and a secondary control circuit are also provided in the box body;

[0007] The main control circuit includes a main contactor and a motor comprehensive protector, a three-phase power supply end is connected to the input end of the motor comprehensive protector through the first normally open contact of the main contactor, and the output end of the motor comprehensive protector is connected to the drive motor of the local fan;

[0008] The secondary control circuit includes a carbon monoxide detector and a linkage relay, and also includes a DC power supply;

[0009] The carbon monoxide detector is powered by the DC power supply, and the normally open contact of the carbon monoxide detector and the coil part of the linkage relay are connected in series between the positive and negative poles of the DC power supply;

[0010] The positive pole of the direct current power supply is connected with one end of the manual control branch through the normally closed contact of the motor comprehensive protector and the coil part of the main contactor, one end of the manual control branch is connected with one end of the automatic control branch, and the other end of the manual control branch and the other end of the automatic control branch are connected with the negative pole of the direct current power supply.

[0011] The internal structure of the manual control branch is that one end of the manual control branch is connected with the other end of the manual control branch through the normally open start button, the normally closed stop button and the normally open contact of the switch in sequence, and the second normally open contact of the main contactor is connected with the start button in parallel.

[0012] The internal structure of the automatic control branch is that one end of the automatic control branch is connected with the other end of the automatic control branch through the normally open contact of the linkage relay and the normally closed contact of the switch in sequence.

[0013] The box body is provided with a ventilation opening, and the carbon monoxide detector is installed beside the ventilation opening.

[0014] As a further improvement of the local fan linkage control box with the carbon monoxide detection function for the underground mine, the front panel of the box body is further provided with a running indicator lamp, and the running indicator lamp is connected in series between the positive pole and the negative pole of the direct current power supply and the third normally open contact of the main contactor.

[0015] As a further improvement of the local fan linkage control box with the carbon monoxide detection function for the underground mine, the front panel of the box body is further provided with a stop indicator lamp, and the stop indicator lamp is connected in series between the positive pole and the negative pole of the direct current power supply and the normally closed contact of the main contactor.

[0016] As a further improvement of the local fan linkage control box with the carbon monoxide detection function for the underground mine, the front panel of the box body is further provided with a power indicator lamp, and the power indicator lamp is connected between the positive pole and the negative pole of the direct current power supply.

[0017] As a further improvement of the local fan linkage control box with the carbon monoxide detection function for the underground mine, the main control circuit further comprises a main circuit breaker, and the three-phase power supply end is connected with the first normally open contact of the main contactor through the main circuit breaker.

[0018] Compared with the prior art, the utility model has the following positive effects:

[0019] 1. The utility model discloses an integrated carbon monoxide detection function, realized the intelligent linkage control of local fan. In the automatic mode, when the carbon monoxide concentration of mining operation surface exceeds the set critical value (such as 24ppm), local fan can start automatically, ensure that harmful gas in the operation environment is discharged in time. When carbon monoxide concentration falls to the safety range, local fan will stop running, avoid the situation that local fan is long time no work because of artificial forget, reduce the waste of electric power energy. The device not only effectively prevents the occurrence of carbon monoxide poisoning accident, but also avoids the forget or negligence problem that can appear in manual operation, significantly improves the safety of mine operation.

[0020] 2. The device can also switch to manual mode, convenient for operator to control flexibly according to actual situation.

[0021] 3. The utility model discloses the component (such as circuit breaker, contactor, relay, motor comprehensive protector) all for ordinary industry standard parts, low in cost, convenient for large-scale popularization and application. DRAWINGS

[0022] Figure 1 It is the appearance schematic diagram of the utility model;

[0023] Figure 2 It is the main control loop diagram of the utility model;

[0024] Figure 3 It is the secondary control loop diagram of the utility model. PREFERRED EMBODIMENT

[0025] The technical scheme of the utility model will be described in detail below in combination with the drawings. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment.

[0026] As Figure 1 , a local fan linkage control box with carbon monoxide detection function for underground mine, including box 1. Box 1 meets the general type low-voltage equipment requirements of mine, protection level IP68, starting box size high * wide * deep = 420mm * 350mm * 220mm. Box 1 has a front door (including front panel), and rubber strip is installed between the front door and the body of box 1 to strengthen sealing, and 3 groups of stainless steel hinges are used to ensure firm installation. The thickness of the iron plate of box 1 is not less than 1.5mm and is treated with anticorrosion. The wiring mode of box 1 is down-in down-out. Box 1 has a grounding busbar, which facilitates the connection of grounding wire, and the body of box 1 is connected with the front door by soft copper wire.

[0027] The front panel of the box 1 is provided with a start button 6, a stop button 7 and a switch 5, and is also provided with a power indicator 2, a running indicator 3 and a stop indicator 4. The switch 5 includes normally open contacts and normally closed contacts with opposite states, and is used to switch between manual mode and automatic mode.

[0028] The box 1 is also provided with a main control circuit and a secondary control circuit.

[0029] As shown in Figure 2 , the main control circuit includes a main circuit breaker 8, a main contactor 9 and a motor comprehensive protector 10. The three-phase power supply end is connected to the input end of the motor comprehensive protector 10 through the main circuit breaker 8 and the first normally open contact of the main contactor 9 in sequence, and the output end of the motor comprehensive protector 10 is connected to the driving motor 11 of the local fan. The main contactor 9 is responsible for the start-stop control of the driving motor 11.

[0030] The motor comprehensive protector 10 is a device for protecting the motor, which is usually connected in the power supply circuit of the motor to monitor the operating state of the motor and prevent the motor from being damaged due to faults such as open phase, overload and short circuit. It detects current, voltage and other parameters in real time to determine whether the motor is in an abnormal state. The motor comprehensive protector 10 is usually equipped with a normally closed contact that remains closed during normal operation of the motor to ensure smooth circuit; when a fault is detected, the protector will trigger the normally closed contact to open.

[0031] As shown in Figure 3 , the secondary control circuit includes a carbon monoxide detector 14 and a linkage relay 13, and also includes a DC power supply. The DC power supply converts AC power to 24V DC power. The positive and negative output ends of the DC power supply are provided with a fuse 12 to prevent damage to the equipment or fire caused by overloading or short circuit of the circuit.

[0032] The carbon monoxide detector 14 is powered by the DC power supply, and the normally open contact of the carbon monoxide detector 14 and the coil part of the linkage relay 13 are connected in series between the positive and negative poles of the DC power supply.

[0033] The secondary control circuit also includes a manual control branch and an automatic control branch in parallel. The positive pole of the DC power supply is connected to one end of the manual control branch through the normally closed contact of the motor comprehensive protector 10 and the coil part of the main contactor 9, and the one end of the manual control branch is connected to one end of the automatic control branch. The other end of the manual control branch and the other end of the automatic control branch are both connected to the negative pole of the DC power supply.

[0034] The internal structure of the manual control branch is that one end of the manual control branch is connected with the other end of the manual control branch through the normally open start button 6, the normally closed stop button 7 and the normally open contact of the change-over switch 5 in sequence, and the second normally open contact of the main contactor 9 is connected in parallel with the start button 6.

[0035] The internal structure of the automatic control branch is that one end of the automatic control branch is connected with the other end of the automatic control branch through the normally open contact of the linkage relay 13 and the normally closed contact of the change-over switch 5 in sequence.

[0036] The box 1 is provided with a ventilation opening, and the carbon monoxide detector 14 is installed beside the ventilation opening to detect the concentration of carbon monoxide in the external air through the ventilation opening.

[0037] During operation, the operator can set the device to the automatic mode or the manual mode through the change-over switch 5.

[0038] In the automatic mode, when the concentration of carbon monoxide detected by the carbon monoxide detector 14 is higher than the set critical value (for example, 24 ppm), the normally open contact of the carbon monoxide detector 14 will be closed, the coil part of the linkage relay 13 is powered on, and the normally open contact is closed, so that the coil part of the main contactor 9 is powered on, the first normally open contact of the main contactor 9 in the main control circuit is closed, and the driving motor 11 is powered on to start running. When the concentration of carbon monoxide is lower than the critical value, the normally open contact of the carbon monoxide detector 14 will be disconnected, the coil part of the linkage relay 13 is powered off, and the normally open contact is disconnected, so that the coil part of the main contactor 9 is powered off, and the first normally open contact is disconnected, and the driving motor 11 of the local fan is automatically turned off.

[0039] In the manual mode, the normally open contact of the change-over switch 5 is closed, and the normally closed contact is disconnected. At this time, no matter the state of the normally open contact of the carbon monoxide detector 14, the state of the main contactor 9 is determined by the start button 6 and the stop button 7. When the start button 6 is pressed, the coil part of the main contactor 9 is powered on, the first normally open contact of the main contactor 9 in the main control circuit is closed, the driving motor 11 is powered on to start running, and at the same time, the second normally open contact of the main contactor 9 is closed to short the start button 6, realizing self-locking. When the stop button 7 is pressed, the coil part of the main contactor 9 is powered off, and the first normally open contact and the second normally open contact are disconnected, and the driving motor 11 is powered off to be turned off.

[0040] When the driving motor 11 is running, if a fault such as open phase, overload and short circuit occurs, the normally closed contact of the motor comprehensive protector 10 will be automatically disconnected, so as to forcibly power off the coil part of the main contactor 9 and turn off the driving motor 11.

[0041] Further, the running indicator lamp 3 is connected in series between the positive and negative poles of the DC power supply through the third normally open contact of the main contactor 9, and the running indicator lamp 3 is lit synchronously when the driving motor 11 is running. The stop indicator lamp 4 is connected in series between the positive and negative poles of the DC power supply through the normally closed contact of the main contactor 9, and the stop indicator lamp 4 is lit synchronously when the driving motor 11 is stopped. A power indicator lamp 2 is also installed on the front panel of the box body 1, and the power indicator lamp 2 is connected between the positive and negative poles of the DC power supply.

[0042] It should be noted that, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. The scope of the present application is defined by the claims rather than the above description.

Claims

1. A local fan linkage control box with carbon monoxide detection function for underground mines, comprising a box body (1), characterized in that: The front panel of the box (1) is provided with a start button (6), a stop button (7) and a change-over switch (5), the change-over switch (5) comprises normally open contacts and normally closed contacts with opposite states; the box (1) is further provided with a main control circuit and a secondary control circuit; The main control circuit comprises a main contactor (9) and a motor comprehensive protector (10), the three-phase power supply end is connected with the input end of the motor comprehensive protector (10) through the first normally open contact of the main contactor (9), and the output end of the motor comprehensive protector (10) is connected with a driving motor (11) of the local fan; The secondary control circuit comprises a carbon monoxide detector (14) and a linkage relay (13), and further comprises a direct current power supply; The carbon monoxide detector (14) is powered by the direct current power supply, and the normally open contact of the carbon monoxide detector (14) and the coil part of the linkage relay (13) are connected in series between the positive and negative poles of the direct current power supply; The secondary control circuit further comprises a manual control branch and an automatic control branch in parallel; one end of the direct current power supply is connected with one end of the manual control branch through the normally closed contact of the motor comprehensive protector (10) and the coil part of the main contactor (9), one end of the manual control branch is connected with one end of the automatic control branch, and the other end of the manual control branch and the other end of the automatic control branch are both connected with the negative pole of the direct current power supply; The internal structure of the manual control branch is that one end of the manual control branch is connected with the other end of the manual control branch through the normally open start button (6), the normally closed stop button (7) and the normally open contact of the change-over switch (5) in sequence, and the second normally open contact of the main contactor (9) is connected with the start button (6) in parallel; The internal structure of the automatic control branch is that one end of the automatic control branch is connected with the other end of the automatic control branch through the normally open contact of the linkage relay (13) and the normally closed contact of the change-over switch (5) in sequence; The box (1) is provided with a ventilation opening, and the carbon monoxide detector (14) is installed beside the ventilation opening.

2. The local fan linkage control box with carbon monoxide detection function for underground mines according to claim 1, characterized in that: The front panel of the box (1) is further provided with a running indicator lamp (3), the running indicator lamp (3) is connected in series with the third normally open contact of the main contactor (9) between the positive and negative poles of the direct current power supply.

3. The local fan linkage control box with carbon monoxide detection function for underground mines according to claim 1, characterized in that: The front panel of the box (1) is further provided with a stop indicator lamp (4), the stop indicator lamp (4) is connected in series with the normally closed contact of the main contactor (9) between the positive and negative poles of the direct current power supply.

4. The local fan linkage control box with carbon monoxide detection function for underground mines according to claim 1, characterized in that: The front panel of the box (1) is further provided with a power indicator lamp (2), and the power indicator lamp (2) is connected between the positive and negative poles of the direct current power supply.

5. The local fan linkage control box with carbon monoxide detection function for underground mines according to claim 1, characterized in that: The main control circuit further comprises a main circuit breaker (8), and the three-phase power supply end is connected with the first normally open contact of the main contactor (9) through the main circuit breaker (8).

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