SU1423484A1 - Apparatus for controlling working brake of mine hoist - Google Patents

Abstract

The invention relates to the field of mine hoisting machines, which require limiting the dynamic intensity of the emergency braking mode, and can be used on lifting installations equipped with pneumatic-load or spring-pneumat1} cheshim brake actuator with an electropneumatic regulator of working braking, in the coal and mining industries. The purpose of the invention is to increase reliability while simplifying the design of the device. The device contains an electropneumatic pressure regulator 1 with a control winding 2 connected to the rural controller 3, controlling the braking force through the current relay 4, a cutter 5 and a switching terminal 6 or opening 7 contacts (respectively, when the load-air or spring-pneumatic brake drive), which are positionally connected with the operational switch 8 of the operating mode of the speed limiter 9 of the hoist machine. The resistor 5 sets the first braking power level, and setting the switch 8 to the control position with the speed limiter 9 low machine speed closes (with a load-carrying brake drive) contact 6 or opens (with a spring-pneumatic brake drive) i contact 7, a shunt resistor 5, and by what means it is possible to obtain maximum braking force at the working brake of the machine. If a fault occurs in the brake control circuits, relay 4 de-energizes and triggers a fault signal. 1 il. I (lu w 4i 00

Description

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The invention of the OTHOG No. E © H to mine hoisting machines, which require limiting the dynamic intensity of the emergency mode: is possible and can be used in lifting installations equipped with a pneumatic or spring-pneumatic brake with an electropneumatic regulator, operating braking in coal and ore mining industry

The aim of the invention is to increase reliability while simplifying the device.

The drawing shows a schematic diagram of the device.

The device contains an electropneumatics pressure regulator 1, the control winding 2 of which is connected to the selsyn command device 3, controlling the braking force through the current relay A, the braking resistor 5 and the switching contacts 6, which are mechanically connected to the switch 8 operating mode limiter 9 speed hoist.

The device works as follows

In the case of control of the working brake of the hoisting machine equipped with a pneumatic brake actuator, in the initial position of the resilient utility device 3 When the output voltage is decelerated, the maximum voltage is open, the switching contact 6 is open and a limited current flows through the resistor 5 in the winding 2 control circuit of the pressure regulator values corresponding to the threshold of the first power stage of the brake, with the transfer of the command device 3 to the position Braked, the voltage at its output decreases In proportion to the displacement control unit 3 to the minimum value, which determines the magnitude of the duty current in the circuit. Circuit 2. pressure controller i, sufficient only to hold the current relay in the absence of braking force at the output of the pressure regulator I.

If it is necessary to carry out technological operations using a hoist using the maximum braking force of the second stage of the braking, which is safe only at low speed of the machine, the switch 8 modes of operation

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The speed limiter 9 is set to control the small (no more than 1.0-1.5 m / s) speed of the executive body of the machine and the switching contact 6 connected to it in contact with the circuit 6 is closed, the resistor 5 of the first braking stage is shunted. At the same time, in the Inhibited position, the current in the pressure regulator circuit increases to the maximum value, and the service brake develops maximum braking force. In the Disinhibited position, a standby current flows in the pressure regulator 1 circuit, which is sufficient only to hold the current relay 4,

The automatic self-monitoring of the device malfunction is ensured by the fact that in the event of disturbances in the brake control circuits, the relay 4 de-energizes and issues a fault signal I ,,

In the case of a working brake of a lifting brake equipped with spring-pneumatic actuating brakes, the operation of the device is similar to that described for machines with pneumatic load brakes; but since the spring-pneumatic brake actuator differs from the pneumatic load mutually inverse characteristic dependence of the braking force control, in the device instead of the closing contact 6 for disconnecting the braking stage resistor 5 a disconnecting switching contact 7 is used, by: positionally connected to the switch 8 of the speed limiter 9, The first brake stage is provided with the closed position of the contact 7, and the second stage with the maximum braking force - with the contact open. 7, when the switch 8 of the speed limiter 9 is set to the low speed control position of the executive body of the hoist.

Claims (1)

Invention Formula A device for controlling an operating brake of a mine hoisting machine, comprising a pressure regulator, the winding of which is connected to the circuit of a selsync command gear through a braking resistor with parallel switching contacts connected to it, a speed limiter with 3J4234844 the mode switch and current relays are mechanically connected to the power switch, which is distinguished by the fact that the limit switch mode switch is used to increase reliability when rostied, and the current relay is switched on by simplifying the device, switching devices with a braking resistor.