SU1707211A1 - Pilot controlled check valve of mine hydraulic prop - Google Patents

Abstract

The invention relates to mining degradation and can be used in hydraulic mine girder liners. The purpose of the invention is to improve the dynamic characteristics of the discharge of a hydrocall. In case 1 there is a zolgnik 7 with the formation of cavities of high 2 and low 3 pressures of cavity 5, in which there is a spring-loaded relief piston 14. In the spool 7, the opening 11 and the two radial overflow holes 9 and 10 communicated with it , radial orifices of small section 12, the last of which are located in the spool 7 on the side of the low pressure cavity between the seal 8 and the first row of radial overflow holes 9. When pressure is applied through the line 19. the piston 14 displaces the gold 7 upwards. A high pressure drop from the piston cavity 15 of the hydraulic column 17 and from the high pressure cavity 2 occurs first through the openings of a small section 12, and then through the first row of radial overflow holes 9, which ensures the continuous discharge of the hydraulic rack. 1 p. F-ly, 1 ill.

Description

The invention relates to mining equipment and can be used in hydraulic racks of mine mechanized roof supports.

The purpose of the invention is to improve the dynamic characteristics of the hydrostatic discharge by eliminating the hydraulic shock and simplifying the design of the hydraulic lock.

The drawing shows the hydraulic lock. included in the hydrostatic circuit

The hydraulic shaft lock has a housing 1 with a high pressure cavity 2 and a low pressure 3 connected by a bore 4. The low pressure cavity J is separated from cavity 5 and throttling by a partition 6. Along the axis of the housing 1 in rasninka 4, there is a cylindrical slide valve 7 sec.

seal 8, placed in its upper

ChESTP.

The spool 7 has the first 9 and second 10 rows of radial overflow holes, an axial hole 11 and radial holes with a small section 12, the latter of which are located between the seal 8 and the first row 9 of the radio overflow holes of the first 9 and second 10 raldoes and radial orifices of small section 12 are connected to the axial bore 11 of the spool 7. The spool 7 is spring-loaded: 5 3 cavities 5 of the housing 1 is located once a piston 14 with a seal 15 Piston cavity 16 hydroelectric 17 nd din with high pressure cavity 2 guide

The main line 18. The control main line 19 is connected to the rod end 20 of the hydraulic post 17 and # the load hole 21 of the body 1. The body 1 also has an opening 22 through which the hydraulic line 17 is fed and drained

The hydraulic lock works as follows.

The spool 7 by means of a seal 8 blocks the high pressure cavity 2. When unloading the high pressure cavity 2. communicating via the hydraulic line 18 to the piston cavity 1G of the hydraulic legs 17, control pressure is supplied along hydraulic line 19 to the opening 21 under the discharge piston 14. which begins to move, compressing the spring 13 and moving up the spool 7. As the spool 7 moves, the seal 8 comes out of the bore 4, opening the high pressure cavity 2. Further movement of the spool 7 allows through 4 out of the bore 4 The small holes of small section 12 significantly reduce the high pressure of the working fluid in the high pressure cavity 2. At the end of the movement of the spool 7, the first row of radial primary holes 9 moves from the cavity 2 m through the axial hole 11 and the second row of radial overflow holes 10 provides for overmolting at low pressure n cavity 3. At the same time, the second row of radial overflow holes 10 leaves the throttling partition b and takes a position opposite the holes 22.

After depressing the control in the hydraulic line 19, the spring 13 returns the spool 7 and the discharge piston 14 to the initial position, locking the seal 8 with the high pressure cavity 2.

Such constructive execution of the hydraulic lock of the mine hydraulic post allows to eliminate hydraulic shocks when unloading the piston cavities of the hydraulic posts of high pressure, and significantly simplify the design of hydroelectric pumps.

Claims (1)

Invention Formula Hydraulic lock of mine shaft post, comprising a housing with high and low pressure cavities connected by a bore, a valve with a seal with two rows of radial overflow holes and an axial bore connected to them, located in a bore connecting high and low pressure cavities, a discharge piston located in the housing cavity, characterized in that, in order to improve the dynamic characteristics of the discharge of the hydraulic post by eliminating the hydraulic shock and simplifying the design of the hydraulic lock, in the spool from the side of the strips Low pressure between the seal and the first row of radial overflow holes is made of radial throttling holes associated with the axial bore of the spool, and in the housing there is a throttling baffle separating the low pressure cavity from the cavity of the discharge piston; separated by a throttling partition from the cavity of the discharge piston. Cfu5 washing / 20 / sixteen / 13