Motor control system for air compressor of heavy-duty locomotive

Abstract

The motor control system for the air compressor of the heavy-duty locomotive comprises a first branch, a second branch and a third branch, the first branch comprises a normally-open button, a normally-closed button, a normally-closed contact of an overcurrent sensor and an intermediate relay which are sequentially connected in series, and the normally-open button is connected with a first normally-open contact of the intermediate relay in parallel; the second branch comprises a second normally open contact of the intermediate relay, a normally closed contact of the pressure sensor and an alternating current contactor which are sequentially connected in series, and the first branch and the second branch are both connected to the direct current power supply; and the third branch comprises a first normally open contact of the alternating current contactor, an over-current sensor and a motor which are sequentially connected in series, and the third branch is connected to an alternating current power supply. According to the utility model, the reliability of the motor control system of the air compressor of the heavy-duty locomotive in a severe working environment is greatly improved, the safety production is ensured, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automatic control, and in particular relates to a motor control system for an air compressor of a heavy-duty locomotive. Background Art

[0002] Heavy-duty locomotives are important equipment for transporting iron ore in open-pit mines. Due to their large carrying capacity and large inertia, heavy-duty locomotives must have a reliable braking system, namely: the air compressor is driven by a motor to fill the main air cylinder with high-pressure gas to maintain sufficient air pressure in the main air cylinder. When the running heavy-duty locomotive needs to brake, the air valve opens and the high-pressure gas enters the brake motor, thereby braking the heavy-duty locomotive.

[0003] At present, the motor control system of heavy-duty locomotive air compressor is relatively common, but most of them are composed of PLC programmable controllers. The composition of these circuits has a good effect on the motor control of heavy-duty locomotive air compressors. However, due to the high requirements of PLC programmable controllers on the environment, working in harsh environments such as mines will inevitably have an adverse effect on the reliability of the control system. Utility Model Content

[0004] 1. Technical Problems to be Solved

[0005] The utility model provides a motor control system for a heavy-duty locomotive air compressor, the purpose of which is to improve the reliability of the motor control system of the heavy-duty locomotive air compressor and make it adaptable to work in harsh environments.

[0006] 2. Technical Solution

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions, including: a first branch, a second branch, and a third branch.

[0008] Furthermore, the first branch includes a normally open button connected to the positive pole of the DC power supply, the other end of the normally open button is connected to the normally closed button, the other end of the normally closed button is connected to the normally closed contact of the overcurrent sensor, the other end of the normally closed contact of the overcurrent sensor is connected to the intermediate relay, and the other end of the intermediate relay is connected to the negative pole of the DC power supply; the normally open button is connected to the first normally open contact of the intermediate relay, and the intermediate relay is connected to the first indicator light.

[0009] Furthermore, the second branch includes a second normally open contact of an intermediate relay connected to the positive pole of a DC power supply, the other end of the second normally open contact of the intermediate relay is connected to the normally closed contact of a pressure sensor, the other end of the normally closed contact of the pressure sensor is connected to an AC contactor, and the other end of the AC contactor is connected to the negative pole of the DC power supply; the AC contactor is also connected to a second indicator light.

[0010] Furthermore, the third branch includes a first normally open contact of an AC contactor connected to an AC power supply, the other end of the first normally open contact of the AC contactor is connected to an overcurrent sensor, the other end of the overcurrent sensor is connected to a motor, and the other end of the motor is connected to the other end of the AC power supply.

[0011] Preferably, the DC power supply is a 24V DC power supply.

[0012] Preferably, the AC power supply is a 220V AC power supply.

[0013] 3. Beneficial Effects

[0014] The utility model provides a motor control system for a heavy-duty locomotive air compressor, which greatly improves the reliability of the motor control system of the heavy-duty locomotive air compressor in a harsh working environment, ensures safe production, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the electrical principle diagram of the first and second branches of the utility model.

[0016] Figure 2 This is the third branch electrical principle diagram of the utility model. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, so as to facilitate a clearer understanding for those skilled in the art.

[0018] Example 1

[0019] This embodiment includes a first branch, a second branch, and a third branch.

[0020] like Figure 1 As shown, the first branch includes a normally open button An1 connected to the positive pole of the DC power supply, the other end of the normally open button is connected to the normally closed button An2, the other end of the normally closed button is connected to the normally closed contact RJ-1 of the overcurrent sensor, the other end of the normally closed contact of the overcurrent sensor is connected to the intermediate relay JD, and the other end of the intermediate relay is connected to the negative pole of the DC power supply; the normally open button is connected in parallel to the first normally open contact JD-1 of the intermediate relay, and the intermediate relay is connected in parallel to the first indicator light D1.

[0021] The second branch includes the second normally open contact JD-2 of the intermediate relay connected to the positive pole of the DC power supply, the other end of the second normally open contact of the intermediate relay is connected to the normally closed contact P of the pressure sensor, the other end of the normally closed contact of the pressure sensor is connected to the AC contactor KM, the pressure sensor is placed at the port of the main air cylinder outlet valve to detect the pressure of the high-pressure gas in the main air cylinder, the other end of the AC contactor is connected to the negative pole of the DC power supply; the AC contactor is also connected to the second indicator light D2.

[0022] like Figure 2 As shown, the third branch includes a first normally open contact KM-1 of an AC contactor connected to an AC power supply, the other end of the first normally open contact of the AC contactor is connected to an overcurrent sensor RJ, the other end of the overcurrent sensor is connected to a motor M, and the other end of the motor is connected to the other end of the AC power supply.

[0023] The DC power supply in this embodiment is a 24V DC power supply.

[0024] The AC power supply in this embodiment is a 220V AC power supply.

[0025] The working process of this utility model:

[0026] Press the normally open button An1. Since the normally closed button An2 and the normally closed contact RJ-1 of the overcurrent sensor are both in the closed state, the intermediate relay JD is energized. The first normally open contact JD-1 of the intermediate relay is closed to protect the normally open button An1. The first indicator light D1 is on. At the same time, the second normally open contact JD-2 of the intermediate relay is closed. Since the normally closed contact P of the pressure sensor is in the closed state, the AC contactor KM is energized. The second indicator light D2 is on. The first normally open contact KM-1 of the AC contactor is closed. The motor M starts, driving the heavy locomotive air compressor to run and inflate the main air cylinder.

[0027] When the motor is overcurrent, the normally closed contact RJ-1 of the overcurrent sensor is disconnected, the intermediate relay JD is released, the first normally open contact JD-1 of the intermediate relay is disconnected, the first indicator light D1 goes out, and at the same time the second normally open contact JD-2 of the intermediate relay is disconnected, the AC contactor KM is released, the second indicator light D2 goes out, the first normally open contact KM-1 of the AC contactor is disconnected, and the motor stops working;

[0028] When the high-pressure gas pressure in the main air cylinder is too high, the pressure sensor will be activated, the normally closed contact P of the pressure sensor will be disconnected, the AC contactor KM will be released, the motor will stop running, and the second indicator light D2 will go out; when the high-pressure gas pressure in the main air cylinder returns to normal, the normally closed contact P of the pressure sensor will be closed, the AC contactor KM will be energized, the motor will resume running, and the second indicator light D2 will light up.

[0029] The utility model discloses a motor control system for a heavy-duty locomotive air compressor, which has a simple structure and stable operation, greatly improving the reliability of the motor control system of the heavy-duty locomotive air compressor in harsh working environments, ensuring safe production and improving production efficiency.

Claims

1. A motor control system for a heavy-duty locomotive air compressor, comprising a first branch, a second branch, and a third branch, characterized in that: The first branch includes a normally open button (An1) connected to the positive pole of a DC power supply, the other end of the normally open button is connected to a normally closed button (An2), the other end of the normally closed button is connected to a normally closed contact (RJ-1) of an overcurrent sensor, the other end of the normally closed contact of the overcurrent sensor is connected to an intermediate relay (JD), and the other end of the intermediate relay is connected to the negative pole of the DC power supply; the normally open button is connected in parallel to a first normally open contact (JD-1) of the intermediate relay, and the intermediate relay is connected in parallel to a first indicator light (D1).

2. The motor control system according to claim 1, characterized in that: The second branch includes a second normally open contact (JD-2) of an intermediate relay connected to the positive pole of a DC power supply, the other end of the second normally open contact of the intermediate relay is connected to a normally closed contact (P) of a pressure sensor, the other end of the normally closed contact of the pressure sensor is connected to an AC contactor (KM), the other end of the AC contactor is connected to the negative pole of the DC power supply; and the AC contactor is connected in parallel to a second indicator light (D2).

3. The motor control system according to claim 2, characterized in that: The third branch includes a first normally open contact (KM-1) of an AC contactor connected to an AC power supply, the other end of the first normally open contact of the AC contactor is connected to an overcurrent sensor (RJ), the other end of the overcurrent sensor is connected to a motor (M), and the other end of the motor is connected to the other end of the AC power supply.

4. The motor control system according to claim 3, characterized in that: The DC power supply is a 24V DC power supply.

5. The motor control system according to claim 4, characterized in that: The AC power supply is a 220V AC power supply.

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