RU5403U1 - SCRAPER CONVEYOR DRIVE - Google Patents

Abstract

The drive of the scraper container, including an electric motor with a control circuit and a gear reducer, the shafts of which are connected by a safety coupling having a driving and driven coupling half, characterized in that concentric magnetic cores are mounted on the driving and driven coupling halves with permanent magnets mounted on them, and the magnets of the driving coupling half are located with a gap relative to the magnets of the driven coupling half and facing each other with opposite poles, while at least one of the magnetic cores in made movable in the axial direction, and the motor control circuit is equipped with a device for tracking the magnitude of the load current of the electric motor.

Description

MKY® B65 23/00

Scraper Drive

The utility model relates to the underground coal mining technique, in particular, to scraper conveyor drives for delivering coal from clean faces, and the beat motor was used in the operation of mines in the coal industry.

Known drive scraper conveyor, including an electric motor, coaxially connected to the input shaft of the gearbox, and an electromagnetic clutch. The electromagnetic remains of the leading and driven parts (half-coupling) (USSR, AS 1260304, MSh V 65 23/00, VI // 36 1986).

The main disadvantage of such a drive is the low reliability of its operation and increased fire hazard.

A known drive of the scraper conveyor Rnbyik containing an electric motor and a gear reducer, whose shafts are connected by a hydrodynamic clutch. The coupling consists of a leading and a driven half coupling:,. The drive is also equipped with an electric motor control circuit (Fig. I94I4-08 / 7. Downhole scraper conveyors 225/750; ЯуЬ к 225/750 Ш-Offer of the company „/ (Rt | Shi; kr 1993) - prototype.

When the scraper conveyor is not overloaded, the hydrodynamic / uft glides, while its leading coupling half rotates relative to the driven one. When the conveyor overloads, the latter slows down the speed or stops / stops completely.

is. Shoirss slip continues until the motor is turned off. Due to the possibility of sliding hydrodynamic wluff, protection against breakdowns of the mechanical part of the scraper conveyor and drive units is carried out.

However, the known drive of the scraper conveyor has reduced reliability and complicated operating conditions for the following reasons:

1.During overloading of the scraper-scraper and the sliding research institute of the hydrodynamic drive clutch, the working fluid in the clutch is heated due to the fact that the motor forcibly overcomes its internal resistance.

With prolonged neperijy3Ke conveyor, unacceptable fluid overheating in the hydrodynamic coupling may occur

and actuation of the fuse safety device provided therein. As a result, the process fluid flows from

couplings and it becomes inoperative.

For the subsequent start-up of the conveyor drive, it is necessary to fill the coupling cavity with the working fluid and restore its operability, which is difficult to perform in the face of the mine;

2, The operating conditions of the known drive of the scraper conveyor are also complicated by the fact that it is necessary to control the presence of fluid in the hydrodynamic coupling and the sheathing of its seals during the work, due to the fact that a decrease due to leakages in the volume of the working fluid impairs the traction characteristics of the coupling.

If fluid leaks are detected, the hydrodynamic coupling must be replaced or repaired.

KOHE8t0DOB. The technical result that will be achieved by using the technical solution of the utility model will improve the reliability of the drive of the scraper conveyor and improve its operating conditions. The technical result is achieved by the fact that in the drive of the scraper conveyor, which includes an electric motor with a control circuit and a gear reducer, the shafts of which are connected by a safety clutch consisting of a driving and driven half clutches, concentric magnetic circuits with permanent magnets mounted on them are mounted on the latter. In this case, the magnets of the leading doomuft are located with a gap relative to the magnets of the driven half-coupling and face the opposite poles. At least one of the magnetic cores is made axially movable, and the motor control circuit is equipped with a device for tracking the magnitude of the load current of the electric motor. The essence of the utility model is the stability of the magnetic flux forces, achieved due to the physical characteristics of a multipolar magnetic system formed by concentric magnetic conductors with permanent magnets located on the driven and leading half-couplings. At the moment of drive overload - when increased torque occurs - the clutch breaks down, at which the driving coupling half under the action of an electric motor freely rotates relative to the driven one. This ensures reliable protection of the mechanical part of the scraper conveyor and drive from breakdowns.

The presence of a gap between the drive coupling and driven coupling halves, which are separated by spaced poles, makes it possible to freely rotate the coupling relative to each other after failure of the coupling. During the stall, the torque transmitted by the clutch and, accordingly, the magnitude of the load current of the electric motor, drop sharply. With a sharp drop in the load current, the device automatically monitors the value of the load current, and the control circuit disconnects the electric motor. After the drive stops, the magnetic flux between the poles of the magnetic system is restored and the coupling is ready for operation.

This simplifies the operating conditions of the drive of the scraper conveyor / The presence of an axially movable magnet wire with permanent magnets allows you to adjust the magnitude of the magnetic flux and transmitted torque, as well as to establish the optimal value of the moment, which increases the reliability of protection of the scraper conveyor from overloads.

From the analysis of the identification and patent information, the claimed combination of consumable elements of the drive of the scraper conveyor, ensuring the achievement of the indicated technical result, has not been identified, which will allow us to conclude that the claimed technical solution meets the novelty criterion.

The essence of the utility model is illustrated by drawings, where Fig. 1 shows a general view of the drive of the scraper conveyor, Fig. 2 is a longitudinal section AA through the safety clutch of Fig. 1; Fig. 3 is a section B-B of Fig. 2; Fig. 4 is a view B of Fig. 2 and Fig. 5 is a control diagram of a drive motor.

The drive CONTAINS an electric KDD motor I (fzhgL) connected by a safety casing 2 with a gear reducer 3, a pull sprocket asterisk 4 of the scraper conveyor 5. Safety 1 coupling 2 (Fig. 2) consists of driven half coupling 6 mounted on the shaft of electric motor I, and a driven half coupling V, on input shaft of editor 3.

On nolumufgas 6 and 7, concentric magnetic circuits 8 and 9 are mounted with permanent magnets 10 and II fixed to them with equal step along the periphery (Fig. 3). In this case, magnets 10 and II are installed with a gap a, facing opposite poles and together with the magnetic circuits 8 and 9 form a magnetic system. The cases on; 5gmuft 6 and 7 are made of non-magnetic material, and the magnetic cores 8 and 9 are made of soft magnetic steel.

Magnitoprob od 9 is made movable along the axis of the clutch and is in contact with the captive screws 12 (figure 1). To fix the magnetic circuit 9 in the angular and axial directions on the coupling half 7, a key connection 13 and fixing bolts 14, located in the grooves 15, are provided on the housing along the coupling 7. (Fig. 3, 4).

The electric motor I (Fig. 5) interacts with a control circuit that includes the main elements: the input switch with contacts 16, the start button of the electric motor I with normally open:; :: contact 17, the shutdown button with normally closed contact 18, the starter 19 with normally open contacts 30 and 21 and a device for monitoring the magnitude of the load current 24 with a normally open contact 25.

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10 And II And magnetic wires 8 and 9 form magnetic shtods, the KOTOpbtx force fields are closed through the gap a (Fig. 3) and ensure that the torque is transmitted from the leading 6 to the driven half-coupling 7.

Initially, the magnitude of the torque transmitted by the clutch 2 is regulated, for which purpose, the moving screws 9 are moved by magnets II with magnets II relative to magnets 10, thereby reducing the magnitude of the magnetic flux. After adjusting and checking the magnitude of the torque, the magnetic core 9 is fixed with bolts 14 from axial displacement, while the magnetic core is fixed in the angular position in the housing of the driven half coupling 7 with keyed connection 13.

When starting the electric motor I of the drive, initially :: the input switch closes the circuit 16 and the voltage is supplied to the control circuit. In this case, the voltage does not reach the electric motor I and the starter 19, since the normally open contacts 17.20 are open. When a start button is pressed, its contact 17 closes, and voltage is supplied through the contacts 17 and 18 to the starter 19. The starter 19 closes the circuits 20 and 21, while the contact 20 provides self-power to the IQ starter. Through the contacts 21, the voltage is supplied to the electrode IRI, which will rotate through the safety clutch 2 and gear 3 to the traction sprocket 4, bringing 1Pyu to the chain of the scraper conveyor 5. During acceleration of the conveyor, the current increases in the circuit of the motor I and when it reaches its set value | 1 device 24 is activated, closing contacts 25. During normal operation of the conveyor 5, the leading 6 and the driven 7 rotate at the same speeds and transmit torque from the magnetic flux.

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During the P8r8 load of the conveyor 5, the traction sprocket 4 is decelerated or completely stopped, and the gearbox 3 and the driven coupling half 7 are stopped with it, while the transmitted torque increases.

As soon as the torque exceeds the 1st setting of the safety clutch 2, it begins to slip. The leading coupling half 6, under the action of the electrode Big I, continues to rotate, and the driven coupling half 7 slows down the speed and stops, the magnets 10 and II are displaced relative to each other, breaking the magnetic flux, and the coupling 2 breaks down. The moment transmitted by the coupling drops sharply and the drive rotates freely. coupling halves 6 at rated speed of rotation of the electric motor I, while repeated 1) the 1st pick-up of coupling 2 does not occur, as a result of which the mechanical part of the conveyor and drive are unloaded from overload.

If the clutch 2 is broken, it is simultaneously spinning. of the instant, the magnitude of the load current of the motor I drops sharply, while the automatic tracking device for the magnitude of the current 24 is activated, which opens the contact 25. The circuit supplying the starter ICf breaks. The latter opens the contacts 30 and 21, as a result of which the motor I is switched off. Due to this, the safety clutch 2 does not slip for a long time and the possible overheating of the magnetic system is distorted.

After the motor stops, the magnetic system of clutch 2 restores the magnitude of the magnetic flux, then couplings 6 and 7 return to their working position, in which the magnets 10 and II are turned to each other with opposite poles, the conveyor drive is ready for further work.

SHCH8NNO: HOBog the complete water-proof coupling, the presence on the floor of the coupling couplings with magnets, the possibility of automatic shutdown; When the couplings break down, together with the rest of the drive construction elements, the electric motor with the breakdown of the coupling ensures the achievement of a technical result, increases the reliability of the drive and improves its operating conditions.

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Claims (1)

The drive of the scraper container, including an electric motor with a control circuit and a gear reducer, the shafts of which are connected by a safety clutch having a driving and driven half-coupling, characterized in that concentric located magnetic cores with permanent magnets mounted on them are mounted on the driving and driven half-couplers, and the magnets of the leading half-coupling are located with a gap relative to the magnets of the driven coupling half and facing each other with opposite poles, while at least one of the magnetic cores in made movable in the axial direction, and the motor control circuit is equipped with a device for tracking the magnitude of the load current of the electric motor.