Fan control device with delayed stop function

Abstract

The utility model discloses a fan control device with a delayed stop function, which comprises a main control loop used for supplying power to a load motor and a secondary control loop, and the load motor is used for driving a fan to rotate; the secondary control loop comprises a start button, a stop button, a change-over switch, a main contactor and a delay relay; and a second normally open contact of the main contactor is arranged in the main control loop. The device can be closed at regular time after the load motor is started, avoids the situation that the local ventilator is not closed by people and does idle work for a long time when workers shift, can save a large amount of energy, and meanwhile has the advantages of being low in cost, convenient to control and the like.

Description

Technical Field

[0001] The utility model relates to a fan control device for an underground mine. Background Art

[0002] When working at an underground mine excavation face, local ventilators need to be installed at the entrance of each excavation face to enhance air circulation on the working face, prevent carbon monoxide accumulation, and reduce the ambient temperature.

[0003] According to the existing work process, after workers complete the drilling work of a single excavation face, they will blast and mine. After blasting, they will turn on the local ventilator to ventilate the face. This is also the handover time for the three-shift workers. It usually takes about 2 hours from the departure of the on-duty workers to the arrival of the off-duty workers. After blasting on a general face, ventilation for about 15 minutes is enough to meet the work needs of the next shift. Since no one controls the fan, the fan is always on for the remaining 1 hour and 45 minutes. Therefore, each local ventilator will be doing useless work for more than 5 hours a day, which not only reduces the service life of the local ventilator, but also causes a huge waste of electricity due to the huge number of fans underground. Utility Model Content

[0004] The utility model provides a fan control device with a delayed stop function, the purpose of which is to solve the problem that the existing fans in the well cannot stop working automatically.

[0005] The technical solution of this utility model is as follows:

[0006] A fan control device with a delayed stop function comprises a main control circuit for supplying power to a load motor, the load motor being used to drive the fan to rotate, and a secondary control circuit;

[0007] The secondary control circuit includes a start button, a stop button, a transfer switch, a main contactor and a time delay relay;

[0008] The first branch in the secondary control loop is connected between the positive electrode of the power supply and the negative electrode of the power supply;

[0009] One end of the first branch is connected to the common end of the transfer switch through a stop button and a start button connected in series, the stop button is a normally closed type, and the start button is a normally open type; the first connection end of the transfer switch is connected to the other end of the first branch through the coil of the main contactor, and the second connection end of the transfer switch is connected to the other end of the first branch through the normally closed contact of the delay relay and the coil of the delay relay in sequence; the coil of the main contactor and the coil of the delay relay are connected in parallel; the first normally open contact of the main contactor is also connected in parallel with the start button;

[0010] The second normally open contact of the main contactor is arranged in the main control circuit.

[0011] As a further improvement of the fan control device with delayed stop function: a motor integrated protector is also provided in the main control circuit, and the normally closed contacts of the motor integrated protector are arranged in the first branch and are connected in series with the stop button and the start button.

[0012] As a further improvement of the fan control device with delayed stop function: the secondary control circuit also includes a second branch connected in parallel with the first branch, and the second branch is provided with a series-connected operation indicator light and a third normally open contact of the main contactor.

[0013] As a further improvement of the fan control device with delayed stop function: the secondary control loop also includes a third branch connected in parallel with the first branch, and a power indicator light is provided in the third branch.

[0014] As a further improvement of the fan control device with delayed stop function: the secondary control loop also includes a fuse connected in series with the first branch.

[0015] As a further improvement of the fan control device with delayed stop function: a main circuit breaker is also provided in the main control circuit.

[0016] As a further improvement of the fan control device with delayed stop function: it also includes a box, the start button, the stop button and the change-over switch are installed on the outer door of the box, and the main contactor and the delay relay are installed in the box.

[0017] Compared with the prior art, the utility model has the following positive effects:

[0018] 1. The utility model can be turned off at a fixed time after the load motor is turned on, avoiding the local ventilator from being turned off when workers change shifts, doing useless work for a long time, and can save a lot of energy.

[0019] 2. The utility model can not only realize the automatic shutdown of the fan, but also switch to manual mode through the conversion switch to manually control the opening and closing of the fan.

[0020] 3. The circuit breakers, contactors, relays, time delay relays, motor integrated protectors, indicator lights, start / stop buttons and other components used in the utility model are all common components with low manufacturing cost, simple principle, safety and reliability, easy operation, and convenient for large-scale promotion and application, and are especially suitable for upgrading and transformation of existing underground ventilators. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the appearance diagram of the utility model;

[0022] Figure 2 Main control loop diagram;

[0023] Figure 3 This is the secondary control loop diagram. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments.

[0025] like Figure 1 As shown, a fan control device with a delayed stop function includes a box 1, which meets the requirements of general low-voltage equipment for mining, with a protection level of IP54, and the size of the starter box is height*width*depth = 400mm*300mm*200mm. An outer door is provided on the front side of the box 1, and the outer door and the box 1 body are connected by two sets of stainless steel hinges. At the same time, rubber strips are installed on the frame to strengthen the closure. The iron plate thickness of the box 1 is not less than 2mm and is treated with anti-corrosion. The wiring method of the control device is bottom-in and bottom-out, and a grounding busbar is provided in the box 1 to facilitate the connection of the grounding wire.

[0026] The control device further includes a power indicator light 2 , an operation indicator light 3 , a conversion switch 4 , a start button 5 and a stop button 6 , and the above components are all arranged on the outer door of the box body 1 .

[0027] Electrically, the control device includes Figure 2 The main control circuit shown and Figure 3 The secondary control loop is shown.

[0028] like Figure 2 As shown, the main control circuit connects the main circuit breaker 7, the second normally open contact (main contact) of the main contactor 8, the motor comprehensive protector 9 and the load motor 10. The load motor 10 is used to drive the fan blades of the fan to rotate. The main control circuit is connected with insulated copper wire, and the power line is connected to the upper end of the main circuit breaker 7, and then led out from the lower end of the main circuit breaker 7, connected to the upper main contact of the main contactor 8, and then led out from the lower main contact of the main contactor 8, passing through the motor comprehensive protector 9, and finally connected to the load motor 10. When the second normally open contacts of the main circuit breaker 7 and the main contactor 8 are closed, the load motor 10 is energized and the fan starts to run. When the second normally open contact of the main circuit breaker 7 or the main contactor 8 is disconnected, the load motor 10 is powered off and the fan stops working. The motor comprehensive protector 9 has the functions of phase loss, overload and short circuit protection.

[0029] like Figure 3 As shown, the secondary control loop includes a first branch, a second branch and a third branch connected in parallel, and two groups of fuses 11 are arranged between the three groups of branches and the positive and negative electrodes of the power supply.

[0030] Among them, the first branch connects the conversion switch 4, the normally open contact of the start button 5, the normally closed contact of the stop button 6, the coil of the main contactor 8 and its two sets of normally open contacts, the normally closed contact of the motor integrated protector 9, the fuse 11 and the coil of the delay relay 12 and its normally closed contact. One end of the first branch is connected to the common end of the conversion switch 4 through the normally closed contact of the motor integrated protector 9, the stop button 6 and the start button 5 connected in series. The first connection end of the conversion switch 4 is connected to the other end of the first branch through the coil of the main contactor 8, and the second connection end of the conversion switch 4 is connected to the other end of the first branch through the normally closed contact of the delay relay 12 and the coil of the delay relay 12 in turn. The coil of the main contactor 8 and the coil of the delay relay 12 are connected in parallel. The first normally open contact of the main contactor 8 is also connected in parallel with the start button 5 to achieve self-locking. The delay time of the delay relay 12 is adjustable, and the adjustment range in this embodiment is 0-30min.

[0031] The second branch is provided with an operation indicator light 3 and a third normally open contact of a main contactor 8 connected in series. When the main contactor 8 is energized, the operation indicator light 3 lights up.

[0032] A power indicator light 2 is provided in the third branch.

[0033] The working process of this control device is as follows:

[0034] After the control box is connected to the power supply, the power indicator light 2 is always on, reminding the operator that the control box is powered.

[0035] When there is no need to delay shutdown, switch 4 is switched to the first connection terminal, which is in manual mode: after the operator presses the start button 5, the coil of the main contactor 8 is energized, and the first normally open contact of the main contactor 8 is closed to achieve self-locking, and the third normally open contact of the main contactor 8 in the second branch is also closed, the operation indicator 3 is always on, and the second normally open contact of the main contactor 8 in the main control circuit is closed, and the fan starts to run. When it is necessary to stop, just press the stop button 6.

[0036] When a delayed shutdown is required, the conversion switch 4 is switched to the second connection terminal. At this time, it is in automatic mode. After the operator presses the start button 5, similarly, the three groups of normally open contacts of the main contactor 8 are closed, self-locking is achieved, the fan starts, and the running indicator light 3 lights up. At the same time, the delay relay 12 starts timing. When the delay relay 12 reaches the set time, the normally closed contact of the delay relay 12 is disconnected, the coils of the main contactor 8 and the delay relay 12 lose power at the same time, the fan stops running, the running indicator light 3 goes out, and the fan automatically stops.

[0037] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. The scope of the present invention is defined by the claims rather than the above description.

Claims

1. A fan control device with a delayed stop function, comprising a main control circuit for supplying power to a load motor (10), wherein the load motor (10) is used to drive the fan to rotate, characterized in that: Also includes a secondary control loop; The secondary control circuit includes a start button (5), a stop button (6), a change-over switch (4), a main contactor (8) and a time delay relay (12); The first branch in the secondary control loop is connected between the positive electrode of the power supply and the negative electrode of the power supply; One end of the first branch is connected to the common end of the conversion switch (4) through a stop button (6) and a start button (5) connected in series, the stop button (6) is a normally closed type, and the start button (5) is a normally open type; the first connection end of the conversion switch (4) is connected to the other end of the first branch through the coil of the main contactor (8), and the second connection end of the conversion switch (4) is connected to the other end of the first branch through the normally closed contact of the time delay relay (12) and the coil of the time delay relay (12) in sequence; the coil of the main contactor (8) and the coil of the time delay relay (12) are connected in parallel; the first normally open contact of the main contactor (8) is also connected in parallel with the start button (5); The second normally open contact of the main contactor (8) is arranged in the main control circuit.

2. The fan control device with delayed stop function according to claim 1, characterized in that: The main control circuit is also provided with a motor integrated protector (9), the normally closed contact of the motor integrated protector (9) being arranged in the first branch and connected in series with the stop button (6) and the start button (5).

3. The fan control device with delayed stop function according to claim 1, characterized in that: The secondary control circuit also includes a second branch connected in parallel with the first branch, wherein the second branch is provided with an operation indicator light (3) and a third normally open contact of a main contactor (8) connected in series.

4. The fan control device with delayed stop function according to claim 1, characterized in that: The secondary control loop also includes a third branch connected in parallel with the first branch, and a power indicator light (2) is provided in the third branch.

5. The fan control device with delayed stop function according to claim 1, characterized in that: The secondary control loop also includes a fuse (11) connected in series with the first branch.

6. The fan control device with delayed stop function according to claim 1, characterized in that: A main circuit breaker (7) is also provided in the main control circuit.

7. The fan control device with delayed stop function according to any one of claims 1 to 6, characterized in that: It also includes a box (1), the start button (5), the stop button (6) and the change-over switch (4) are mounted on the outer door of the box (1), and the main contactor (8) and the time delay relay (12) are mounted in the box (1).

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