SU787327A1 - Control system of spring-hydraulic actuator of mine hoist brakes - Google Patents

Description

The invention relates to hydraulic control equipment and can be used in brake systems of mine hoisting machines. A system for controlling the spring-hydraulic drive of a mine hoist machine is known, comprising brake cylinders, oil pumps, at the outlet of which filters, safety, overflow and; check valves, safety brake distributor, cavities of which are connected to pressure and drain lines and brake cylinders, pressure regulator, cavities of which are connected to brake cylinders, drain lines and safety brakes, sensor of movement direction and stop of the lifting machine, made in the form of a pump 1. The lack of a known system is lack of scaffolding. The purpose of the invention is to increase the reliability of the system. The goal is achieved by the fact that the output of the direction and stop sensor of the machine is connected by means of an additional check valve and throttle to the distributor of safety braking and to the pressure line of the hydraulic system. The drawing shows a schematic of the control system. The control system of the spring-hydraulically driven brake of mine hoisting machines includes brake cylinders 1, oil pumps 2 of constant capacity, the outputs of which are equipped with filters 3, inverse. 4, safety 5 and overflow 6 valves, safety braking device 7, cavities B and 9 of which are connected to the pressure and drain lines, and cavities 10 and 11 to the brake cylinders and pressure cavity of the pressure regulator 12 with cavities 13 and 14, connected to the brake cylinders and to the drain line, the sensor for the direction of movement and stopping of the lifting machine in the form of a mechanical relay of the pump 15 attached to the shaft, the output of which is. Through the check valve 16, it is connected to the pressure line 17, and through the check valve 18 and the throttle 19 to the control chamber of the safety braking device 7. When the engines of the oil pumps 2 are turned on, pressure appears in the pressure line 17. After applying voltage to the winding of the electromechanical converter of the safety-stopping device 7, its spool moves to the upper position (see drawing), connecting the pressure chamber of the pressure regulator 12 to the pressure line 17, thereby preparing the possibility of releasing the lifting machine with the pressure regulator 12.

When the winding unit of the hoisting machine is rotated in the direction corresponding to the lifting of the load, the pump 15 delivers a part of the liquid under pressure through the check valve 18 and the throttle 19 to the control chamber of the safety braking device 7. At the beginning of the safety braking process, the de-energizing is simultaneously de-energized. a carcass of an electromechanical converter of a safety braking device 7 and both pressure regulators 12. The pressure in the control chamber of the regulator 12 decreases to a value due to the setting of the second (additional) electromechanical converter. By changing the forces acting on the ends of the spool, it moves upwards and connects the brake cylinders to the drain line. After the pressure in the brake cylinders decreases to a value equal to the pressure in the control chamber of the regulator 12, its spool returns to the neutral position, the compartment of the brake cylinders from the drain line. Thus, the first stage during safety braking while lifting the load is provided by the pressure regulator 12 and is changed with the help of its second electromechanical converter.

Under the action of the braking force of the first stage of the safety brake and static force, the speed of the lifting machine decreases. By reducing the speed, the pump 15 is reduced as well as the pressure in the control chamber of the safety braking device 7. With a certain hoisting speed (pump 15), the pressure in the control braking device 7 of the safety braking decreases to such an extent that the force exerted by the spring on the end the spool becomes more force exerted by the pressure of the control chamber on its other end, and the spool moves down. The liquid from the brake cylinders 1 enters the safety braking device 7 into the drain. At the same time, the fluid from the brake cylinders is drained through the pressure regulator 12. The regulator spool 12 under pressure feedback on the bottom

The scientific research institute its butt moves from neutral to upper position. At the other end of the spool, there is no pressure, since the spool of the safety braking device 7 in its lower position cuts off the power supply to the control chamber of the pressure regulator 12,

 - Thus, the imposition of a second stage of safety braking Q when lifting a load is carried out depending on the speed of the hoist using a safety device. braking and pressure regulator.

The control system of the spring-hydraulic 5 brake actuator maintains its operation with the complete removal of the voltage from the rise due to the injection of the hydraulic main 17 through the non-return valve 16 with the pump 15.

In the process of safety braking during the descent of the load, there is no pressure at the outlet of the direction sensor and stopping of the lifting machine

5. Fluid from the brake cylinders 1 is discharged simultaneously through the pressure regulator 12 and the safety braking device 7. Consequently, during descent during safety braking, the application of the full braking torque occurs.

Claims (1)

Invention Formula 5 A control system for a spring-hydraulic actuated brake of a mine hoist, comprising a brake. oil cylinders, oil pumps with filters, safety, overflow and check valves installed, safety braking distributor, cavities of which are connected to pressure and drain lines and brake cylinders, pressure regulator, cavities 5 are connected to brake cylinders, a drain line and a safety braking distributor, a directional sensor for stopping the lifting machine, made in the form of a pump 0, characterized in that, in order to increase the reliability of the system, the output of the direction sensor and the machine stopper is connected via an additional non-return valve and throttle and to the pressure line of the hydraulic system. Sources of information taken into account in the examination 1, Dimashko A.D. and others. Mine electric winches and lifting machines. Directory. M., Nedra, 1973, p. 59. , sh