Mining flame-proof safety type high-voltage reactance type electromagnetic starter

Abstract

A mining explosion-proof safe high-voltage reactance type electromagnetic starter comprises an explosion-proof box body, and a reactor is arranged in the explosion-proof box body. The reactor consists of a spiral coil, a framework and an iron core, one end of the spiral coil is connected with the machine core and the controller, and the other end of the spiral coil is connected with a power supply through a bypass contactor; the iron core is arranged in the framework and connected with the electric push rod, and the iron core can move in the axial direction of the framework under pushing of the electric push rod. A fan is arranged outside the electric reactor and used for cooling the spiral coil. The reactor of the mining flame-proof safety type high-voltage reactance type electromagnetic starter is provided with the iron core, and the iron core can move in the spiral coil under the pushing of the electric push rod. The iron core can increase the reactance of the reactor and prevent the spiral coil from fusing due to heating. In addition, the soft start characteristic of the electromagnetic starter can be changed by moving the iron core, and the starting requirements of different mining equipment can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of mining electrical appliances, in particular to a flameproof safety type high-voltage reactance electromagnetic starter for mining. Background Art

[0002] The explosion-proof safety high-voltage reactance electromagnetic starter for mining is mainly used to control the direct start, stop and forward and reverse operation of mining motors, and can protect mining motors from overload and phase failure. Compared with other electromagnetic starters, the high-voltage reactance electromagnetic starter has a reactor, which solves the problem of poor voltage resistance of thyristors. The main component of the reactor is the spiral coil, which generates a lot of heat while generating reactance. In the case of improper matching or use, the spiral coil has the risk of melting, causing the electromagnetic starter to malfunction. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the utility model discloses a mine-use flameproof safety type high-voltage reactance electromagnetic starter, which adopts the following technical solutions:

[0004] A flameproof safety high-voltage reactance electromagnetic starter for mining comprises a flameproof housing in which a reactor is arranged; the reactor is composed of a spiral coil, a frame and an iron core, wherein one end of the spiral coil is connected to a movement and a controller, and the other end is connected to a power supply through a bypass contactor; the iron core is arranged in the frame and connected to an electric push rod, and the iron core can move axially along the frame under the push of the electric push rod; a fan is arranged outside the reactor for cooling the spiral coil.

[0005] To further improve the technical solution, the power line of the electric push rod is connected to the controller, and the movement of the electric push rod is controlled by the controller.

[0006] To further improve the technical solution, a temperature sensor is provided on the spiral coil, and the temperature sensor is connected to the controller.

[0007] To further improve the technical solution, the power line of the fan is connected to the controller, and the start and stop of the fan are controlled by the controller.

[0008] To further improve the technical solution, the reactor, the electric push rod and the bypass contactor are arranged in the wiring cavity of the flameproof box.

[0009] After implementing the above technical solution, compared with the background technology, the beneficial effects produced by the utility model are:

[0010] The reactor of this explosion-proof safety high-voltage reactance electromagnetic starter for mining has an iron core, which can move in the spiral coil under the push of the electric push rod. The iron core can increase the reactance of the reactor and prevent the spiral coil from fusing due to heating. In addition, the moving iron core can change the soft starting characteristics of the electromagnetic starter to match the starting requirements of different mining equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 Shown is a schematic diagram of the overall structure of the high-voltage reactance electromagnetic starter.

[0012] Attached Figure 2 The attached Figure 1 Schematic diagram of the local structure.

[0013] Attached Figure 3 Shown is a schematic diagram of the cross-sectional structure of the reactor.

[0014] In the attached drawings: 1. Flameproof box; 2. Reactor; 21. Spiral coil; 22. Frame; 23. Iron core; 3. Electric push rod; 4. Bypass contactor; 5. Fan; 6. Temperature sensor. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0016] Attached Figure 1 The figure shows the overall structure of a mine flameproof safety high-voltage reactance electromagnetic starter. Figure 1It can be seen that the high-voltage reactance electromagnetic starter has a flameproof housing 1 welded from steel plates, and a reactor 2, a bypass contactor 4 and an electric push rod 3 are arranged in the flameproof housing 1. The structure and function thereof are described in detail below.

[0017] Refer to the attached Figure 2 and attached Figure 3 , attached Figure 2 The attached Figure 1 Schematic diagram of the local structure, attached Figure 3 The figure shows the cross-sectional structure of the reactor. Figure 2 and attached Figure 3 It can be seen that the reactor 2 is composed of a spiral coil 21 , a skeleton 22 and an iron core 23 . The skeleton 22 is a hollow sleeve-shaped insulator. The spiral coil 21 is wound around the skeleton 22 . The iron core 23 is located in the hollow shaft of the skeleton 22 .

[0018] An electric push rod 3 is fixed at the bottom of the flameproof box 1. The power line of the electric push rod 3 is connected to the controller, and the action of the electric push rod 3 is controlled by the controller. One end of the iron core 23 is connected to the electric push rod 3. Under the push of the electric push rod 3, the iron core 23 can move along the axial direction of the skeleton 22. One end of the spiral coil 21 is connected to the movement and the controller, and the other end is connected to the power supply through the bypass contactor 4.

[0019] The working principle of the reactor is based on Lenz's law. When the current passes through the spiral coil 21 of the reactor 2, a magnetic field will be generated. This magnetic field will hinder any factors that attempt to change the current, thereby playing a role in buffering the starting current of mining equipment. Compared with other industrial equipment, mining equipment has the characteristics of high rated voltage and high power, and will cause a huge impact on the power grid and equipment when starting. The reactor 2 can generate reactance at the moment of starting the mining equipment, so that the output current of the electromagnetic starter increases from a small amount, and plays a protective role in the soft start of the mining equipment. Compared with the soft start method of the thyristor, the reactor 2 has a very high high voltage resistance. However, the reactor 2 will generate a lot of heat while generating high reactance. In the case of improper matching or use, the spiral coil 21 has the risk of melting, causing the electromagnetic starter to fail. For this reason, the iron core 23 and the electric push rod 3 are specially set in the explosion-proof safety type high-voltage reactance electromagnetic starter for mining.

[0020] The function of the iron core 23 is to increase the magnetic field and thus increase the reactance of the spiral coil 21. The greater the reactance, the smaller the current flowing through the spiral coil 21, and the smaller the heat generated by the spiral coil 21. This means that after the iron core 23 is inserted, the current flowing through the spiral coil 21 will become smaller, and the spiral coil 21 is not likely to melt due to heat.

[0021] Under the push of the electric push rod 3, the iron core 23 can move along the axial direction of the frame 22. This design is to change the soft start performance of the electromagnetic starter. When the soft start requires a larger reactance, the iron core 23 can be completely inserted into the spiral coil 21; when the soft start requires a smaller reactance, the iron core 23 can be completely out of the spiral coil 21; when the soft start time needs to be extended, the iron core 23 can be slowly moved by the electric push rod 3. Of course, the iron core 23 can also be moved slowly, quickly, or at intervals as needed to achieve a specific purpose.

[0022] As the reactance of the spiral coil 21 decreases and the current increases, the mining equipment starts to start, and the spiral coil 21 will heat up quickly. The function of the bypass contactor 4 is that when the mining equipment starts normally, the bypass contactor 4 acts to cut off the connection between the spiral coil 21 and the power supply. At this time, the spiral coil 21 is powered off and no longer generates heat.

[0023] In order to prevent the spiral coil 21 from melting due to heating, a fan 5 is provided above the reactor 2. Specifically, the power line of the fan 5 is connected to the controller, and the start and stop of the fan 5 are controlled by the controller. A temperature sensor 6 is provided on the spiral coil 21, and the temperature sensor 6 is connected to the controller. When the temperature of the spiral coil 21 is higher than the safe temperature, the controller turns on the fan 5 to cool the spiral coil 21.

[0024] To further improve the technical solution, the reactor 2, the electric push rod 3, and the bypass contactor 4 are arranged in the wiring chamber of the flameproof box 1. The wiring chamber has an isolation and explosion-proof function, which can prevent the influence of high-voltage discharge on the movement, controller, integrated protector, mutual inductor and other electrical components.

[0025] As can be seen from the above, the reactor 2 of the present explosion-proof safety high-voltage reactance electromagnetic starter for mining has an iron core 23, and the iron core 23 can move in the spiral coil 21 under the push of the electric push rod 3. The iron core 23 can increase the reactance of the reactor 2 and prevent the spiral coil 21 from melting due to heating. In addition, the moving iron core 23 can change the soft starting characteristics of the electromagnetic starter, which can match the starting requirements of different mining equipment.

[0026] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A flameproof safety high-voltage reactance electromagnetic starter for mining, comprising a flameproof box, characterized in that: A reactor is arranged in the flameproof box; the reactor is composed of a spiral coil, a frame and an iron core, wherein one end of the spiral coil is connected to the movement and the controller, and the other end is connected to the power supply through a bypass contactor; the iron core is arranged in the frame and connected to the electric push rod, and the iron core can move axially along the frame under the push of the electric push rod; a fan is arranged outside the reactor for cooling the spiral coil.

2. A mine flameproof safety high voltage reactance electromagnetic starter as claimed in claim 1, characterized in that: The power line of the electric push rod is connected to the controller, and the movement of the electric push rod is controlled by the controller.

3. The flameproof safety high-voltage reactance electromagnetic starter for mining as claimed in claim 1 is characterized in that: A temperature sensor is arranged on the spiral coil, and the temperature sensor is connected to the controller.

4. The flameproof safety high-voltage reactance electromagnetic starter for mining as claimed in claim 1 is characterized in that: The power cord of the fan is connected to the controller, and the start and stop of the fan are controlled by the controller.

5. The flameproof safety high-voltage reactance electromagnetic starter for mining as claimed in claim 1 is characterized in that: The reactor, the electric push rod and the bypass contactor are arranged in the wiring cavity of the flameproof box.

Images