SU390270A1 - MINING COMBINE - Google Patents

Description

one

The invention relates to the mining industry.

Known combine harvesters include an actuator, a loading device, a feed mechanism, and an electric drive control system.

The proposed combine is characterized in that the reducer of the executive body is connected through a torque limiting clutch with two electric motors by means of gear wheels, and the power supply circuit of one electric motor is equipped with an overcurrent relay with a block contact in the time relay circuit, the normally closed contact of which is located in the circuit control of both electric motors. It increases productivity and reliability of the combine in work.

FIG. 1 shows a mining combine, side view; in fig. 2 shows the electrical circuit of the actuator actuator and the actuator control circuit.

The mining harvester includes an actuator / with a cutting part and a gearbox 2, a loading device 3, a feed mechanism 4 and an electric drive, the main elements of which are electric motors 5 6. The shafts of electric motors are connected by gears 7, 8 and 9. Between the electric motors and the reducer of the actuator body installed clutch 10 of the moment (for example, friction). The control system of the electric drive contains a normally open button “Start //, starter 12 with power contacts 13 and auxiliary contact 14, relay

time 15 with contact 16, starter 17 with power contacts 18 and auxiliary contacts 19, overcurrent relay 20 with normally closed auxiliary contact 21, time relay 22 with auxiliary contact 23, normally closed button “Stop 24.

The combine works as follows. The cutting part of the executive body / is inserted into the massif under the action of the feed mechanism 4. Destroyed mountain mass

is removed by the loading device 3. The movement to the cutting tool is transmitted from the electric motors 5 and 6 through the gear wheels 7, 8 and 9, the friction clutch 10 and the gearbox 2.

The executive body is activated by pressing the // button. In this case, the actuator 12 is activated, which closes its power contacts 13, while applying voltage to the electric motor 5. At the same time, it closes

the auxiliary contact 14 n switches on the time relay 15. After the time required to accelerate both electric motors 5 and 6, determined by the setting of the time relay 15, contact 16 of this relay closes. When this triggered actuator 17, which closes the swap

power KOiHTaKTbi / 5 / providing voltage to the motor 6. Simultaneously closes the block contact 19 of this starter, shunting the start button I. Only after this, you can release the button 11. Shunting the button // block contact 19 of the starter 17 provides control over the operation of the entire system and start the electric motor 6.

In order to control the load of the electric motors during operation, an overcurrent 20 relay is turned on in the motor 6 circuit, which is tuned to a response current equal to or slightly more than half the maximum current of the motor 6.

The starting current of the electric motor 6 is reduced due to the fact that the electric motor is turned on after it is accelerated to the rated speed using the electric motor 5. Therefore, the overcurrent relay 20 connected to the power supply circuit of the electric motor 6 does not trip. When the load exceeds the setting of the overcurrent relay, the latter opens its normally closed contact; 21. However, short-term overloads exceeding the maximum motor torque, but not exceeding the time relay setting 22, do not cause

to shut off the electric motors and are eliminated by the friction clutch 10.

The duration of the friction

clutch 10 is limited to setting the time relay

22 having a contact 23 in the control circuit

both electric motors that provides

safety of the friction clutch.

Electric motors are used in the same size, so they are loaded approximately equally.

The actuator is shut off by pressing button 24.

Subject invention

A mountain harvester comprising an actuator, a loading device, a feed mechanism and an electric drive control system, characterized in that, in order to increase the productivity and reliability of the combine in operation, the actuator gearbox is coupled through a torque limiting clutch with two electric motors by means of gear wheels The power supply circuit of one electric motor is supplied with an overcurrent relay with an interlocking contact in a time relay circuit, the normally closed coitact of which is located in the control circuit of both motors. ektrodvigatel mi.

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