Automatic protection device for underground main draw shaft protection net

Abstract

The utility model provides an automatic protective device for a protective net of an underground main draw shaft, which comprises an air switch, a first normally-open contactor a and a motor which are connected in series by three-phase alternating current, and the first normally-open contactor is connected with a second normally-open contactor a in parallel. And a protective net descending control circuit and a protective net ascending control circuit which are arranged in parallel are connected between two live wires of the three-phase alternating current. The protective net descending control circuit and the lifting control circuit are arranged to control ascending and descending of the protective net, the protective net can be automatically controlled to stop moving after the protective net reaches a corresponding position, and the situation that a lifting motor is not operated in place can be effectively prevented; the circuit is simple in structure, few in electrical elements, low in cost and convenient to operate.

Description

Technical Field

[0001] This utility model belongs to the technical field of downhole protection equipment, and relates to an automatic protection device for the downhole main chute protection net. Background Technology

[0002] Safety protection at the wellhead is a key aspect of on-site safety management in wells. Currently, the industry commonly uses manual on-site operation to start and stop the wellhead safety net lifting motor, with personnel being alerted by shouting warnings. However, during on-site production operations, there are hidden risks associated with personnel working in the wellhead area, and issues such as forgetfulness or inadequate operation of the lifting motor can arise. Furthermore, the lifting motor's inability to automatically start and stop effectively prevents and protects the safety of personnel working at the wellhead. Utility Model Content

[0003] The purpose of this utility model is to provide an automatic protection device for the main chute protection net in wells, addressing the problems existing in the prior art.

[0004] Therefore, the present invention adopts the following technical solution:

[0005] An automatic protection device for the main chute protection net in a well includes an air switch, a first normally open contactor a, and a motor, all connected in series by three-phase AC power. The first brake contactor is connected in parallel with a second normally open contactor a. A protection net descent control circuit and a protection net ascent control circuit are connected in parallel between two of the live wires of the three-phase AC power.

[0006] Furthermore, the protective net descent control circuit includes a first contactor coil, a lower limit switch, a second normally closed contactor, and a protective net descent button switch arranged in series. The protective net descent button switch is connected in parallel with a relay and a first normally open contactor b. The relay is connected to a controller, and the controller is connected to a human proximity sensor.

[0007] Furthermore, the protective net raising control circuit includes a second contactor coil, an upper limit switch, a first normally closed contactor, and a protective net raising push button switch arranged in series, with a second normally open contactor b connected in parallel to the protective net raising push button switch.

[0008] Furthermore, the protective net descent control circuit is connected in series with a fuse.

[0009] Furthermore, the protective net descent control circuit is connected in series with an emergency stop switch.

[0010] Furthermore, the controller is connected to an alarm.

[0011] The beneficial effects of this utility model are as follows: it sets up a lowering control circuit and an uppering control circuit for the protective net to control the raising and lowering of the protective net, and can automatically control the protective net to stop moving after it reaches the corresponding position, which can effectively prevent the lifting motor from being operated incorrectly; the circuit structure is simple, there are few electrical components, the cost is low, and the operation is convenient. Attached Figure Description

[0012] Figure 1 This is the circuit diagram of this utility model;

[0013] Figure 2 This is a control principle diagram of the present invention;

[0014] In the diagram, 1-protective net descent control circuit, 2-protective net ascent control circuit, 3-controller, 4-human proximity sensor, 5-alarm. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings:

[0016] like Figure 1 and 2 As shown, an automatic protection device for a downhole main chute safety net includes a first normally open contactor aKM1a and a motor M connected in series with a three-phase AC power supply. The motor M is used to drive the safety net to rise or fall. A second normally open contactor aKM2a is connected in parallel with the first normally open contactor aKM1a. When either the first normally open contactor aKM1a or the second normally open contactor aKM2a is closed, the motor M is energized and rotates forward or backward. When the second normally open contactor aKM2a is closed, the three live wires of the three-phase AC power supply A are reversed with the motor M, causing the motor M to reverse. Two of the live wires of the three-phase AC power supply AC power supply (i.e., L1 and L2) are connected in parallel with a safety net descent control circuit 1 and a safety net rise control circuit 2. Specifically, the safety net descent control circuit 1 includes a series-connected... The circuit consists of a first contactor KM1 coil, a lower limit switch SQ1, a second normally closed contactor KM2, and a protective net lowering button switch SB2. The protective net lowering button switch SB2 is connected in parallel with a relay KA and a first normally open contactor bKM1b. The relay KA and the first normally open contactor bKM1b are also connected in parallel. The relay KA is connected to a controller 3, and the controller 3 is connected to a human proximity sensor 4. When an operator approaches the corresponding position, the human proximity sensor 4 can send a signal to the controller 3, which can control the relay KA to be energized. The controller 3 is also connected to an alarm 5. When an operator approaches the corresponding position, the controller 3 can control the alarm 5 to sound an alarm to alert the operator. In addition, a fuse FU and an emergency stop switch SB1 are installed on one of the live wires of the three-phase AC power supply (i.e., the L1 live wire).

[0017] The protective net raising control circuit 2 includes a second contactor KM2 coil, an upper limit switch SQ2, a first normally closed contactor KM1, and a protective net raising push button switch SB3 arranged in series. The protective net raising push button switch SB3 is connected in parallel with a second normally open contactor bKM2b. When the coil of the first contactor KM1 is energized, the first normally open contactors aKM1a and bKM1b can be closed, and the first normally closed contactor KM1 can be opened. When the coil of the second contactor KM2 is energized, the second normally open contactor aKM2a and the first normally open contactor bKM2b can be closed, and the second normally closed contactor KM2 can be opened.

[0018] The method of using this utility model is as follows:

[0019] When an operator approaches the designated area, the human proximity sensor 4 sends a signal to the controller 3. The controller 3 then energizes the relay KA and triggers the alarm 5 to alert the operator. When the relay KA is energized, the coil of the first contactor KM1 in the protective net descent control circuit 1 is energized, causing the first normally open contactors aKM1a and bKM1b to close. When the first normally open contactor aKM1a closes, the motor M is energized and rotates, causing the protective net to descend. When the protective net descends to its lower limit position, it contacts the lower limit switch SQ1. The lower limit switch SQ1 then opens, de-energizing the protective net descent control circuit 1 and the coil of the first contactor KM1, thus causing the first normally open contactor aKM1a to open. When motor M stops rotating, the protective net stops descending. Alternatively, the protective net can be manually descended via the protective net descent button switch SB2. To manually descend, simply press the protective net descent button switch SB2 to energize the coil of the first contactor KM1 in the protective net descent control circuit 1. This energizes the first normally open contactors aKM1a and bKM1b. Since the closure of the first normally open contactor bKM1b keeps the protective net descent control circuit 1 continuously energized even after the protective net descent button switch SB2 is opened, the first normally closed contactor KM1 will open during net descent, ensuring that the protective net ascending control circuit 2 cannot be energized. This prevents the protective net descent control circuit 1 and the protective net ascending control circuit 2 from being energized simultaneously, thus avoiding a malfunction.

[0020] When the protective net needs to be raised, simply press the protective net raising button switch SB3 to energize the coil of the second contactor KM2 in the protective net raising control circuit 2. This causes the second normally open contactor aKM2a and the first normally open contactor bKM2b to close. When the second normally open contactor aKM2a closes, the motor M is energized and rotates in the reverse direction, causing the protective net to rise. When the protective net rises to the upper limit position, it contacts the upper limit switch SQ2. The lower limit switch SQ2 opens and de-energizes the protective net raising control circuit 2 and the coil of the second contactor KM2, causing the second normally open contactor aKM2a to open, the motor M to stop rotating, and the protective net to stop rising. Similarly, when the protective net is raised, the second normally closed contactor KM2 will open, ensuring that the protective net lowering control circuit 1 cannot be energized.

Claims

1. An automatic protection device for the main chute protection net in a well, characterized in that, It includes an air switch connected in series with three-phase AC power, a first normally open contactor a, and a motor. The first normally open contactor a is connected in parallel with a second normally open contactor a. A protective net lowering control circuit and a protective net raising control circuit are connected in parallel between two of the live wires of the three-phase AC power.

2. The automatic protection device for the main chute protection net in a well as described in claim 1, characterized in that, The protective net descent control circuit includes a first contactor coil, a lower limit switch, a second normally closed contactor, and a protective net descent button switch arranged in series. The protective net descent button switch is connected in parallel with a relay and a first normally open contactor b. The relay is connected to a controller, and the controller is connected to a human proximity sensor.

3. The automatic protection device for the main chute protection net in a well as described in claim 1, characterized in that, The protective net lifting control circuit includes a second contactor coil, an upper limit switch, a first normally closed contactor, and a protective net lifting button switch arranged in series. The protective net lifting button switch is connected in parallel with a second normally open contactor b.

4. The automatic protection device for the main chute protection net in a well as described in claim 1, characterized in that, A fuse is installed on one of the live wires of the three-phase AC power supply.

5. The automatic protection device for the main chute protection net in a well as described in claim 1, characterized in that, An emergency stop switch is installed on one of the live wires of the three-phase AC power supply.

6. The automatic protection device for the main chute protection net in a well as described in claim 2, characterized in that, The controller is connected to an alarm.

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