CN111725010A

CN111725010A - Large-scale motor pneumatic contactor is used in mine

Info

Publication number: CN111725010A
Application number: CN202010659487.XA
Authority: CN
Inventors: 周先浩
Original assignee: Huangshan Haoyun Mining Equipment Energy Saving Development Co ltd
Current assignee: Huangshan Haoyun Mining Equipment Energy Saving Development Co ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2020-09-29

Abstract

The invention relates to a pneumatic contactor of a large motor for mines, which is provided with an arc-extinguishing chamber, wherein the middle inside the arc-extinguishing chamber divides the inside of the arc-extinguishing chamber into an upper space and a lower space through a diaphragm plate, and the lower space is internally provided with a driving cylinder and an electromagnetic valve for controlling the driving cylinder; an insulating supporting plate is arranged on the upper end head of a piston rod of the driving cylinder, three groups of movable end wiring boards which are arranged side by side are fixedly arranged on the insulating supporting plate, movable contacts are respectively arranged on two end heads of each group of movable end wiring boards, a static end wiring board is respectively arranged on two sides of each movable end wiring board corresponding to each movable contact, each static end wiring board is erected through an insulating supporting plate arranged on a transverse partition plate, one end of each static end wiring board extends out of the side wall of the arc extinguishing cover, and a static contact is arranged on the other end head of each static end wiring board; the contactor disclosed by the invention has the advantages that the use cost and the later maintenance cost are greatly reduced, the noise is low, the safety is high, and the on-site practical use value is very good.

Description

Large-scale motor pneumatic contactor is used in mine

Technical Field

The invention relates to the technical field of power system equipment, in particular to a pneumatic contactor of a large motor for a mine.

Background

The circuit breakers used on a main control loop (36V-380V low-voltage apparatus) in the current market are all of an inductance magnet type, the starting and stopping of a motor are realized by electromagnetic attraction generated by an inductance coil through electric energy, the electromagnetic coil is maintained by the electric energy, and the main control loop has the following defects:

1. the energy consumption is high: the magnetic coils of a 200A AC contactor control loop are all above 0.2kW, large enterprises generally run continuously, calculated in 24 hours, 0.2kW 24=4.8 ℃, a plurality of large mining enterprises produce millions of tons of concentrate annually, one pump room has hundreds of motors, the power is calculated according to the average 200kW, the matched contactor is above 0.3kW, the energy consumption per day is 0.3kW 24=7.2 ℃, the annual consumption of 100 pumps is 7.2 100 30 days 12 months =27920 ℃, the annual electric charge of one pump room control loop magnetic coil of one large enterprise is up to 27920 yuan calculated according to 1 yuan per watt of electricity, and the conservative estimation is also shown, so the energy consumption is quite large.

2. Because the field power supply of the current mine motor is very unstable in the actual environment, the electromagnetic force of a control loop is unstable, the main loop terminal (contact) is often burnt out, and further main equipment (motor) is burnt out, the price of a 200kW motor is tens of thousands of yuan, the repair cost and the material cost are also tens of thousands of yuan, the power distribution cabinet is also exploded and damaged due to the fact that the terminal generates heat and is short-circuited, the price of a single cabinet is tens of thousands of yuan, a large contactor 300A is also thousands of yuan, the labor cost is not low, various conditions are integrated, once the terminal is burnt out, the loss of the power distribution cabinet is very huge, and the phenomenon occurs in the field of a mine.

3. Because the electromagnetic contact face works under the not good environment for a long time, the dust, the greasy dirt stays and will produce the vortex vibrations on the plane, influence is not counted on terminal self, and the noise is fairly big, the workman enters the electromagnetic station once and overhauls, the ear just can not received, because be continuous production, can not stop the maintenance entirely again, only can partially have a power failure and overhaul, consider manufacturing cost's problem, can not change the contactor that produces the noise again all, if tear down and overhaul, it is miscellaneous to work, just overhaul at that time, resume former state after a few days and produce the noise, because this moment inner structure has been out of balance.

4. The overhaul strength is increased: each time a contactor has a problem, it is handled in a simple way, such as burning out the terminals, simple rubbing with sandpaper, or filing, which is possible at the time, but the problem is not solved at all, and of course the production line cannot be stopped for too long, which has serious consequences.

5. The terminal generates heat very severely. It is known that heat energy is supported by energy substances such as kerosene and electric oil, terminal heating is caused by overlarge contact resistance, current is overlarge and material limitation, silver is unrealistic to be used as a terminal, the silver is ground to be flat only by using a silver plating mode for a long time, and the terminal can be heated by shaking due to unstable field power supply voltage and unstable electromagnetic force, the close fit of the terminal is changed, and the terminal is heated to 30-50 ℃ in actual use, and after the terminal is used for half a year, the terminal heating reaches 100-200 ℃, the heating loss of the terminal is very large, the terminal has no kinetic energy consumption, and more serious, main equipment such as a motor can be burnt out.

6. Potential safety hazards exist, for example, when the motor is burnt out, the main circuit needs to be disconnected and replaced, the ground of the pump room is full of sewage, the temperature is very high, the insulation value is very low, and the potential safety hazards are very large.

7. The problem of terminal detection is difficult to find in the point detection electromagnetic station, because all arc-extinguishing covers exist, the arc-extinguishing covers of all circuit breakers cannot be opened for point detection, except for overhaul of the electromagnetic station, the problem exists all over the world, and only the best cost performance is achieved as far as possible.

8. In the competitive era, the quality of the circuit breaker is difficult to guarantee, in terms of taking the terminals, one terminal of a common 300A is only dozens of yuan, and a high-quality silver terminal is thousands of yuan, and unless specially customized, no good method capable of solving the cost performance of the high-quality terminal exists at present.

Disclosure of Invention

The invention aims to solve the problems and the defects of the traditional mine motor start-stop electromagnetic circuit breaker, and provides a large motor pneumatic contactor for a mine.

The specific scheme of the invention is as follows: a pneumatic contactor of a large motor for mines is provided with an arc-extinguishing chamber, the middle inside the arc-extinguishing chamber is divided into an upper space and a lower space by a transverse partition plate, wherein a driving cylinder and an electromagnetic valve for controlling the driving cylinder are arranged in the lower space, and a piston rod of the driving cylinder extends upwards from the transverse partition plate to the upper space; drive actuating cylinder's piston rod overhead end and be equipped with insulating layer board, the fixed end wiring board that moves that is equipped with three groups and arranges side by side that moves that is equipped with on the insulating layer board, every group moves the overhead movable contact that is equipped with respectively in both ends of end wiring board, and the both sides that are located the end wiring board of moving correspond every movable contact respectively and all are equipped with a quiet end wiring board, and every quiet end wiring board all erects through establishing the insulating support board on the cross slab, the arc extinguishing chamber lateral wall is stretched out to the one end of quiet end wiring board, is equipped with quiet contact on the other end of quiet end wiring board, and quiet contact and movable contact one-to-one.

Furthermore, the movable contact point protrudes downwards, the static contact point protrudes upwards, and the movable contact point and the static contact point are driven by the power of the driving cylinder to realize opening or closing actions.

Furthermore, an insulating cover plate is arranged on the insulating support plates on the periphery of the device, and the insulating cover plate and the insulating support plates form an insulating cover together to cover the movable terminal wiring board, the movable contact and the static contact in the middle.

Furthermore, the electromagnetic valve is also provided with a silencer for weakening the noise generated by the cylinder electromagnetic valve.

The invention has the following beneficial effects:

1. the electromagnetic coil control system is high in compatibility and good in adaptability, saves energy consumption compared with the traditional electromagnetic coil control, and is convenient to install and greatly reduced in failure rate.

2. The contactor of the invention has better safety: the driving cylinder adopts a high-quality air storage tank, the air pressure supply is constant, so that the terminal does not shake due to unstable voltage, the pneumatic pressure for terminal attachment is enlarged by 1.5 times of the attachment force of the existing breaker terminal, the contact surface of the terminal is more stable, the heating coefficient of the terminal is reduced by 50%, energy is saved (electric energy is saved), and non-pressure release can be realized on the whole control loop in the aspect of non-pressure (power failure) release.

3. The accident rate is low: because the movable contact driven by the air cylinder is adopted, the driving air pressure is constant, the terminal is tightly attached, and the condition of shaking of the contact point does not exist, so the failure rate of the contactor is low, the failure rate of the main equipment (large motor) is reduced, meanwhile, because the fastening force of the terminal is constant, other external influence factors are eliminated, the loss rate of the power distribution cabinet is greatly reduced, the probability of burning out the large motor is greatly reduced, and the equipment loss cost and the maintenance cost are synchronously and greatly reduced every year.

4. The contactor has simple design and convenient manufacture, solves the difficult problem puzzling large-scale electrical equipment for many years by utilizing the existing pneumatic equipment and principle, creates more visible and touchable economic benefits for the society, and creates more economic benefits for enterprises.

Drawings

FIG. 1 is a schematic main sectional view of the present invention;

FIG. 2 is a schematic view of the cut-away section in the direction A-A in FIG. 1.

In the figure: 1-static end wiring board, 2-static contact, 3-insulating cover plate, 4-moving end wiring board, 5-insulating supporting plate, 6-moving contact, 7-insulating supporting plate, 8-diaphragm, 9-muffler, 10-air inlet pipe, 11-electromagnetic valve, 12-arc extinguishing cover, 13-driving cylinder.

Detailed Description

The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally arranged when products of the present invention are used, and are only used for convenience in describing the present invention or simplifying the description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, or be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 and 2, the invention relates to a pneumatic contactor of a large motor for mines, which is provided with an arc-extinguishing chamber, wherein the middle inside the arc-extinguishing chamber divides the inside of the arc-extinguishing chamber into an upper space and a lower space through a transverse partition plate, a driving cylinder and an electromagnetic valve for controlling the driving cylinder are arranged in the lower space, and a piston rod of the driving cylinder extends upwards from the transverse partition plate to the upper space; drive actuating cylinder's piston rod overhead end and be equipped with insulating layer board, the fixed end wiring board that moves that is equipped with three groups and arranges side by side that moves that is equipped with on the insulating layer board, every group moves the overhead movable contact that is equipped with respectively in both ends of end wiring board, and the both sides that are located the end wiring board of moving correspond every movable contact respectively and all are equipped with a quiet end wiring board, and every quiet end wiring board all erects through establishing the insulating support board on the cross slab, the arc extinguishing chamber lateral wall is stretched out to the one end of quiet end wiring board, is equipped with quiet contact on the other end of quiet end wiring board, and quiet contact and movable contact one-to-one.

Further, in this embodiment, the movable contact protrudes downward, the stationary contact protrudes upward, and the movable contact and the stationary contact are driven by the driving cylinder to open or close.

Furthermore, in this embodiment, an insulating cover plate is mounted on the peripheral insulating support plates, and the insulating cover plate and the insulating support plates together form an insulating cover for covering the movable terminal wiring board, the movable contact and the stationary contact together.

Further, in this embodiment, a silencer is further disposed on the solenoid valve for reducing noise generated by the cylinder solenoid valve.

The contactor is used as a control element for on-off starting and stopping of large-scale power equipment, when the contactor is used specifically, the static end wiring boards on two sides are connected in series into the middle of a control loop and can be used, and when the contactor is used, the rising and falling of a driving cylinder are controlled through the switching of an electromagnetic valve, so that the opening action or the closing action of a movable contact and a static contact is realized, the action of the driving cylinder is rapid and stable, the situation of shaking does not exist basically when the contactor is in place in one step, and the situation of heating of a terminal contact is avoided.

Structural components such as the diaphragm plate and the arc extinguishing chamber in the embodiment need to be designed in an insulating mode, and the specific size needs to meet the safety requirement standard of electric power use.

Claims

1. The utility model provides a mine is with large-scale motor pneumatic contactor, has arc extinguishing chamber, its characterized in that: the middle inside the arc-extinguishing chamber divides the inside of the arc-extinguishing chamber into an upper space and a lower space through a transverse partition plate, wherein the lower space is provided with a driving cylinder and an electromagnetic valve for controlling the driving cylinder, and a piston rod of the driving cylinder extends upwards from the transverse partition plate to the upper space; drive actuating cylinder's piston rod overhead end and be equipped with insulating layer board, the fixed end wiring board that moves that is equipped with three groups and arranges side by side that moves that is equipped with on the insulating layer board, every group moves the overhead movable contact that is equipped with respectively in both ends of end wiring board, and the both sides that are located the end wiring board of moving correspond every movable contact respectively and all are equipped with a quiet end wiring board, and every quiet end wiring board all erects through establishing the insulating support board on the cross slab, the arc extinguishing chamber lateral wall is stretched out to the one end of quiet end wiring board, is equipped with quiet contact on the other end of quiet end wiring board, and quiet contact and movable contact one-to-one.

2. The pneumatic contactor for the large-scale motor for the mine according to claim 1, wherein: the movable contact point protrudes downwards, the static contact point protrudes upwards, and the movable contact point and the static contact point are driven by the power of the driving cylinder to realize the opening or closing action.

3. The pneumatic contactor for the large-scale motor for the mine according to claim 1, wherein: an insulating cover plate is arranged on the peripheral insulating support plates together, and the insulating cover plate and the insulating support plates together form an insulating cover to cover the movable end wiring board, the movable contact and the static contact together.

4. The pneumatic contactor for the large-scale motor for the mine according to claim 1, wherein: and the electromagnetic valve is also provided with a silencer.