CN106395299A - Novel speed regulating soft boot device and utilization method - Google Patents

Abstract

The invention discloses a novel speed-regulating soft-start device and its use method, including six parts: a drive system, a control system, a magnetic coupling, an oil cooling system, a deceleration system and a lubricating system; the drive system is powered by an electric motor, into the magnetic coupling; the control system adjusts the working gap of the magnetic coupling to control the speed of the belt conveyor; the magnetic coupling is a power transmission device; the oil cooling system The temperature of the magnetic coupler is lowered; the reduction system uses a speed reducer to reduce the speed and increase the output torque; the lubrication system is used to reduce wear and improve transmission efficiency. The invention realizes the no-load start-up, overload protection and stepless speed regulation of the belt conveyor, reduces the impact on the power grid during start-up, the problems of short start-up time, excessive tension, and unbalanced multi-machine drive, and greatly improves the use of the conveyor belt. Life, and effectively reduce the vibration problem of the whole system.

Description

A new type of speed-regulating soft-start device and its application method

technical field

The invention relates to the field of mining machinery, in particular to a speed-regulating soft-start device and a use method in the start-up process of a belt conveyor.

Background technique

In recent years, with the advancement of modern mine construction, the scale of the mine has gradually increased, and the design capacity has also increased accordingly. Therefore, the belt conveyor of the transportation system has the advantages of reliability, continuity, high efficiency and strong adaptability to the terrain. It has become a modern The main equipment for the continuous transportation of mine coal. As an important part of the belt conveyor, the driving device is particularly important to the performance of the whole equipment. The belt conveyor is a necessary equipment for the normal production of mines. Therefore, the driving device is required to have good technical performance, so that the belt conveyor can start smoothly, minimize the start (brake) acceleration, reduce the belt tension, and improve the effective service life of the equipment and the belt.

In recent years, many scholars have devoted themselves to the study of soft start system devices for belt conveyors. For example, the application number is: 95234479.3 This utility model has successfully applied for the soft start device for belt conveyors, but it cannot accurately control the starting speed curve; For: 201210101113.1 This invention patent has successfully applied for the double-speed hydraulic soft start device of the belt conveyor, but the device pollutes the environment too much.

Contents of the invention

The technical problem to be solved by the invention is the impact of the starting current of the belt conveyor on the power grid, the excessive dynamic tension caused by the short starting time, emergency shutdown, and the imbalance of multi-machine driving power. A simple structure, convenient installation, The utility model relates to a novel speed-regulating soft-start device and a use method for belt conveyors with low operating cost and safety and reliability.

In order to achieve the above tasks, the present invention adopts the following technical solutions: a novel speed-regulating soft-start device and its use method, including six parts: drive system, control system, magnetic coupling, oil cooling system, deceleration system and lubrication system;

The drive system is powered by an electric motor and transmitted to the magnetic coupling;

The control system is composed of a gap adjusting device controlled by a single-chip microcomputer, which adjusts the working gap of the magnetic coupler, and then changes the output speed of the magnetic coupler, so as to control the speed of the belt conveyor;

The magnetic coupler is a power transmission device, the input end connects the motor and the copper disc of the magnetic coupler through a diaphragm coupling, and the output end is connected with the reducer through the permanent magnet disc of the magnetic coupler. The copper disk is fixed on the copper disk yoke, and the permanent magnet disk is fixed on the permanent magnetic yoke;

The oil cooling system cools down the magnetic coupling;

The deceleration system uses a decelerator to reduce the high speed input by the motor and increase the output torque;

The lubricating system is used to reduce the wear of the reducer and improve its transmission efficiency.

The invention realizes the no-load start-up, overload protection and stepless speed regulation of the belt conveyor, reduces the impact on the power grid during start-up, the problems of short start-up time, excessive tension, and unbalanced multi-machine drive, and greatly improves the use of the conveyor belt. Life, and the motor and the load are not directly mechanically connected, so that the vibration of the motor itself will not cause the vibration of the load, and the vibration problem of the entire system is effectively reduced.

The magnetic coupling comes from Faraday's law of electromagnetic induction. When the permanent magnet eddy current coupler works, the copper disk is connected to the drive motor, and the load is connected to the permanent magnet disk. When the copper disk rotates with the motor, there is a relative force between the copper disk and the permanent magnet disk. Movement, and a slip difference is formed between the rotational speed of the copper disk and the rotational speed of the permanent magnet disk, the magnetic flux passing through the copper disk changes according to a certain law, the alternating magnetic field generates eddy currents on the copper disk, and the induced magnetic field generated by the eddy current and the magnetic field of the permanent magnet Due to the interaction between them, the magnetic force generated by the slip angle displacement drives the magnet disk to rotate with the copper disk in the same direction, and transmits the torque of the drive shaft to the load end, thereby driving the load to do work.

Description of drawings

Figure 1 is a schematic diagram of a speed-regulating soft-start device;

Figure 2 is a schematic diagram of the structure of the magnetic coupler;

Fig. 3 is a block diagram of the magnetic coupler control system;

Among them: 1. Motor; 2. Diaphragm coupling; 3(7). Torque and speed sensor; 4. Magnetic coupling; 5. Temperature sensor; 6. Reducer; 8. Roller; 9. Copper plate; 10 .Permanent magnet; 11. Gap adjustment device; 12. Permanent magnet yoke; 13. Copper plate yoke;

detailed description

The present invention proposes a novel speed-regulating soft-start device and its use method;

The drive system is powered by an electric motor and transmitted to the magnetic coupling;

The control system is composed of a gap adjusting device controlled by a single-chip microcomputer, which adjusts the working gap of the magnetic coupler, and then changes the output speed of the magnetic coupler, so as to control the speed of the belt conveyor;

The magnetic coupler is a power transmission device, the input end connects the motor and the copper disc of the magnetic coupler through a diaphragm coupling, and the output end is connected with the reducer through the permanent magnet disc of the magnetic coupler. The copper disk is fixed on the copper disk yoke, and the permanent magnet disk is fixed on the permanent magnetic yoke;

The oil cooling system cools down the magnetic coupling;

The deceleration system uses a decelerator to reduce the high speed input by the motor and increase the output torque;

The lubricating system is used to reduce the wear of the reducer and improve its transmission efficiency.

The use process is:

Turn on the power switch of motor 1, input the power source, connect the motor 1 and the copper plate 9 of the magnetic coupler 4 through the diaphragm coupling 2, before starting, adjust the air gap to the maximum, so that the motor 1 drives the magnetic force The copper disk 9 of the coupler 4 rotates together, the copper disk 9 is fixed on the copper disk yoke iron 13, the permanent magnet disk 10 is fixed on the permanent magnet yoke iron 12, the permanent magnet disk 10 is in a static state, the output torque is 0, and the light load start, the impact on the power grid is minimized;

Then by adjusting the air gap device 11, the control system adjusts the size of the air gap and changes the slip, thereby changing the speed of the output end to achieve the speed start curve we need. When the air gap gradually decreases and the output torque is greater than the load, the magnetic coupling The copper disk 9 of the device 4 drives the permanent magnet disk 10 to rotate, adjust the air gap to obtain the start curve we need, and use the speed torque sensor 3 (7) to detect the speed of the input and output terminals at all times to feed back to the control system;

The output speed of the magnetic coupler 4 passes through the reducer 6, and the reducer 6 is connected with the roller 8 through the diaphragm coupling 7, and the reduced speed is output to the belt conveyor roller to drive the belt conveyor to start;

When the belt conveyor is stuck, the output speed is 0, which is fed back to the control system through the torque speed sensor, and the air gap is adjusted to the maximum by adjusting the air gap device 11, so that the magnetic coupling is idling and the motor and magnetic coupling are protected. device from damage;

When multiple motors are started, the air gaps of each permanent magnet governor are controlled to achieve power balance and allow one or Several permanent magnet speed governors are implemented with slight slip;

During the operation of the system, the temperature is measured at all times through the temperature sensor 5, and the temperature of the magnetic coupler is cooled through the oil cooling system to prevent the temperature from being too high and damage the permanent magnet of the magnetic coupler. 6 Carry out lubrication protection to improve transmission efficiency.

Claims (2)

1. A new type of speed-regulating soft starter, comprising six parts of drive system, control system, magnetic coupling, oil cooling system, deceleration system and lubricating system, characterized in that: The drive system is powered by a motor, which is transmitted to the magnetic coupler; the control system is to adjust the working gap of the magnetic coupler, and then change the output speed of the magnetic coupler, so as to control the speed of the belt conveyor ; The magnetic coupler is a power transmission device, the input end connects the motor and the copper disc of the magnetic coupler through a diaphragm coupling, and the output end is connected with the reducer through the permanent magnet disc of the magnetic coupler , the copper disc is fixed on the copper disc yoke, and the permanent magnet disc is fixed on the permanent magnet yoke; the oil cooling system cools down the magnetic coupler; the deceleration system uses a reducer to reduce the motor input High speed increases the output torque; the lubricating system is used to reduce the wear of the reducer and improve its transmission efficiency. 2. A method for using the transmission system as claimed in claim 1, wherein the steps are as follows: Turn on the power switch of the motor (1), input the power source, connect the motor (1) and the copper plate (9) of the magnetic coupler (4) through the diaphragm coupling (2), and adjust the air gap to the maximum , the motor (1) drives the copper disk (9) of the magnetic coupler (4) to rotate together, the copper disk (9) is fixed on the copper disk yoke (13), and the permanent magnet disk (10) is fixed on the permanent magnet yoke (12), the permanent magnet disk (10) is in a static state, the output torque is 0, and the light load starts, and the impact on the power grid is minimized; Then by adjusting the air gap device (11), the control system adjusts the size of the air gap and changes the slip, thereby changing the speed of the output end to achieve the speed start curve we need. When the air gap gradually decreases and the output torque is greater than the load, The copper disc (9) of the magnetic coupler (4) drives the permanent magnet disc (10) to rotate, adjust the air gap to obtain the starting curve we need, and detect the input and output terminals at all times through the speed torque sensors (3) and (7). Speed, to feed back into the control system; The output speed of the magnetic coupling (4) passes through the reducer (6), and the reducer (6) is connected with the roller (8) through the diaphragm coupling (7), and the reduced speed is output to the belt conveyor roller, driving the belt Conveyor start; When the belt conveyor is stuck, the output speed is 0, which is fed back to the control system through the torque speed sensor, and the air gap is adjusted to the maximum by adjusting the air gap device (11), so that the magnetic coupling is idling and protects the motor and The magnetic coupling is protected from damage; When multiple motors are started, the air gaps of each permanent magnet governor are controlled to achieve power balance and allow one or It is realized by slight slip of several permanent magnet governors; During the operation of the system, the temperature is measured at all times through the temperature sensor (5), and the temperature of the magnetic coupler is cooled through the oil cooling system to prevent the temperature from being too high, which will cause damage to the magnetism of the permanent magnet of the magnetic coupler, and through the lubrication system. The device (6) is lubricated and protected to improve transmission efficiency.