SU1160043A1 - Arrangement for boosting initial thrust of hydraulic props with external supply - Google Patents

Abstract

DEVICE FOR INCREASING THE INITIAL thrust of hydraulic EXTERNAL pants comprising a multiplier pressure chamber a low pressure is communicated with the control valve, and high pressure cavity gidrostoyki channel supravalvular cavity quick fit, podklapanna cavity which communicates with the pressure and the distributor and through the safety valve with a drain, characterized by TBMj that, in order to increase the reliability of the device in operation, the multiplier piston is mounted in series and coaxially with the hydraulic lock piston with the possibility of interaction in the extreme position with the pusher of the latter.

Description

The invention relates to coal industry, namely to the means of erecting the fastening of the working faces. A device is known for the penetration of the initial thrust of hydraulic girths: containing a multiplier with a piston and high and low pressure chambers, a distributor, a safety valve, a hydraulic lock with a control cavity, and channels ij. However, to ensure the operation of the device, a manually controlled hydraulic distributor is required, as well as the presence of increased pressure in a cavity of small cross section with a constant flow of working fluid into the cavity of a large cross section of the multiplier. Closest to the invention is a device for increasing the initial thrust of an external powered hydrosteck, containing a pressure multiplier, a low pressure cavity of which is in communication with a hydraulic distributor, and a high pressure cavity is connected to a hydrorack channel, a valve valve of a hydraulic lock, the subslap cavity of which is connected to pressure head and with distributor and through safety valve with drain 2. A disadvantage of the known device is the presence of a hydraulic distributor for unloading, the thrust of which interacts with the piston in its extreme position, which reduces the reliability of the device in operation and complicates its design. The aim of the invention is to increase the reliability of the device. The goal is achieved by the fact that in the device of the accumulation of the initial spreading of power pumps with external power supply, there was a pressure multiplier, the low pressure cavity of which is connected to the control valve and the high pressure cavity with channel G1) grapple, over valve valve of the hydraulic lock, the valve valve of which is in communication with the pressure and with the distributor and through the relief valve with discharge, the piston of the multiplier is set to follow but coaxially with porschnem gidroeamka to cooperate in an extreme position with a pusher last The drawing shows a schematic diagram of the hydraulic device. The device consists of a housing 1 in which a multiplier 1 with a differential piston 2 is placed, the second can interact with a hydraulic lock 3 via a pusher 4, opening the locking element 5, a distributor 6 with a spring 7, hydraulically connected to the multiplier and a hydraulic lock, a safety valve 8 Designed for overpressure bypass, and channels 9-16. The multiplier 1 is divided by a differential piston into chambers of a large (low) 17 and small (high) 18 cross section (pressure). During operation of the device, a high pressure flexible hose is connected to the channel 12 with an installation gun at the end, and channels 9 and 15 are connected respectively to the pressure and discharge lines. In the initial position, the installation gun is closed. Fluid from the hydraulic line enters through channel & 9 and 10, through hydraulic lock 3, channels 12 and 13 to the installation gun and into chamber 18 of small section. The piston 2 moves to the right. Through the channel 11, the liquid moves the distributor spool 6 to the right, compressing the spring 7, while the chamber 17 of the large cross section of the multiplier 1 through the channel 14 coendsIt etc with the pressure line. The piston 2 moves to the left and at the end of its stroke, acting on the pusher 4 of the hydraulic lock 3, opens the locking element 5. The channels 10 and 12 are connected, and the pressure in them is equalized. The fluid from the chamber 18 through the safety valve 8 through the channel 15 enters the drain line. When thrusting another hydraulically open the installation gun. At the beginning of the sprocket plate, the pressure in the channels 12, 10 and 11 drops. By this, the valve of the distributor 6 is moved to the left by the action of the spring 7, connecting the chamber 17 to the drain. When the nominal pressure in the hydraulic column is reached, the piston 2 is moved to the right, the hydraulic lock 3 is closed, and the valve spool is swiveled to the right, connecting the chamber 17 to the pressure pipeline. Piston /

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moving to the left pushes out the fluid sections, in the flexible arm and the adjustment, increasing its spreading pistol drops to the main line upon reaching the pressure on which. After that the gun is closed.

A safety valve is set up and disconnected from the hydraulic rack,

Pan 8, the camera is from camera 18 through s. .

It enters the drain line. Using the invention, by opening the hydraulic lock in the end, to simplify the design of the piston device, the pressure in the chamber is low and increase its reliability.

Claims (1)

DEVICE FOR INCREASING THE INITIAL SPACE OF HYDRAULIC POWER SUPPLIES WITH EXTERNAL POWER SUPPLIES, Containing a pressure multiplier, a low-pressure cavity communicated with a valve, and a high-pressure cavity with a hydraulic stand channel, an over-valve cavity with a hydraulic lock, a sub-valve cavity of which is connected with a pressure valve and with a relief valve and characterized in that _e, in order to increase the reliability of the device in operation, the multiplier piston mounted in series and coaxially with the piston in a hydraulic lock possibility of cooperation in the end position with the plunger of the latter.