SU846797A1 - Apparatus for spacing roof support section hydraulic props - Google Patents

Description

(54) DEVICE FOR DISSOLUTION OF HYDROSTAXES OF STRAPS

This invention relates to volumetric hydraulic actuators for underground coal mining. A device for thrusting hydraulic posts of support sections is known, comprising a control unit, multipliers with high and low pressure chambers and annular grooves communicated by channels between themselves, with chambers and a control unit, and check valves placed in the pressure channel at the outlet of high pressure chambers 1 The disadvantages of this device are the complexity of the design and the presence of significant volumetric losses of the working fluid from the high-pressure chambers and annular grooves into the drain and pressure hydraulic lines. The purpose of the invention is to simplify the design and reduce the volume loss of the working fluid. The goal is achieved by the fact that the device is additionally equipped with a pressure valve with high and low pressure cavities, check valves are installed in series, the pressure channel between the latter is connected to the high pressure chambers, and the first flow check valve is connected to the control unit and to the high cavity pressure of the pressure valve, the low pressure cavity of which communicates with the annular grooves. The drawing shows the principle hydraulic circuit of the device. The device for spreading the hydro-supports of the support sections comprises a control block 1, multipliers 2 and 3 with high pressure chambers 4 and 5 and low pressure 6 and 7, and annular grooves 8-15, communicated by channels 16-25 between each other, with chambers 4-7 and the block 1, and check valves 26 and 27 placed in the pressure channel 28 at the outlet of the high pressure chambers 4 and 5. The device is additionally equipped with a pressure valve 29 with high pressure cavities 30 and 31 low pressure; the check valves 26 and 27 are installed in series, pressure channel 28 between the afterbirth of connected channels 32 and 33 with the pressure chambers 4 and 5 and the first flow check valve 26 is coupled to the control unit 1 and the cavity 30, the pressure of the pressure valve 29, a low pressure cavity 31 which communicates the duct 34 with annular grooves

8-15. The grooves 8, 11, 12, 13 are permanently connected to the drain hydroline 35 by the channel 36. The device is connected to the pressure hydroline 37 via the channel 38 and through the control unit 1, which is connected to the pressure channel 28 at the outlet of the check valve 27, and through the hydraulic unit 40, with the piston cavity 41, hydroracks 42, and with the rod cavity 43 through channel 44. The communication of the grooves 8-15 and chambers 4-7 is carried out using the grooves 45 and 46 of the multipliers 2 and 3. It is connected with the hydroline 35 of the overflow channel 47.

The device works as follows.

For spreading, the hydraulic unit 1 is installed in position II. The working fluid from the pressure line 37 through the control unit 1 through channel 16 enters the cavity 30 of the high pressure discharge valve 29, which is set to a response pressure greater than the response pressure of the hydraulic unit 40 of the hydraulic rack 42, through check valves 26 and 27, the pressure channel 28 and through the hydraulic unit 40 In the piston cavity 41 of the hydraulic rack 42. In this case, the hydraulic column 42 moves apart until the upper support element of the section abuts the roof of the clearing, the excavation, the pressure in the hydraulic system increases, the pressure valve 29 opens and the fluid through the channels 32, 18 and 22 through the grooves 9 and 10, 15 and 14, the grooves 45 and 46 enters the low pressure chambers 7 and 6. Due to the fact that the multiplier 2 is in the extreme left position, it remains stationary, and the multiplier 3 moves from the right position to the left and from the high pressure chamber 5 displaces the fluid through the check valve 27 through the pressure channel 28 through the hydraulic unit 40 into the piston CAVITY 41 of the hydraulic post 42 and connects the groove 46 with the groove 46 control through channel 16 via check valve 26 Alu 32 enters chamber 4, moving multiplier 2 to the right, displaces fluid from low pressure chamber 6 through channel 20, through grooves 14 and 13, groove 46, through channels 23, 24, 36 into drainage line 35 and connects groove 45 between grooves 10 and 11. The working fluid from channel 16 through the check valve 26 and through channel 33 enters chamber 5, moving multiplier 3 to the right, displaces the working fluid from chamber 7 through channel 21 through grooves 10 and 11, groove 45, through channels 19, 36 into drainage line 35,

grooves 14 and 15 are interconnected by groove 46. Then the working fluid from the channel 16 enters through the pressure valve 29 through the channels 32 and 22, through the grooves 14 and 15, the groove 46, through the channel 20 enters the

the low pressure chamber 6 moves the multiplier 2 to the left and displaces the next portion of the working fluid through the channel 32 through the check valve 27 through the pressure channel 28 and through the hydraulic unit 40 to the piston cavity 41 of the hydraulic post 42. Further cycles

The operation of the multipliers 2 and 3 are repeated until the final spread of the hydroracks 42. To unload the hydrorails 42, the control unit is set to the third position. When the control unit 1 is installed in the first position, the hydraulic post 42 extends apart, mine multipliers 6 and 7.

The proposed device for the spacer of the girder rails of the lining section is simpler than the known one, since the multipliers 2 and 3 have a total of 8 annular grooves smaller than

multipliers of the known device. In addition, the lack of direct connection of the high-pressure chambers 4 and 5 with the annular grooves of the multipliers 2 and 3 makes it possible to reduce the volume loss of the working fluid.

Claims (1)

Invention Formula A device for spreading hydraulically secured roof supports containing a control unit, multipliers with high and low pressure chambers and annular grooves communicated by channels between themselves, with chambers and a control unit, and check valves placed in the pressure channel at the outlet of the high pressure chambers, characterized in that, in order to simplify the design and reduce the volume loss of the working fluid, the device is additionally equipped with a pressure valve with high and low pressure cavities, check valves are installed They are connected in series, the pressure channel between the latter is connected to the high-pressure chambers, and the first non-return valve is connected to the control unit and to the high-pressure cavity of the pressure valve, the low-pressure cavity of which is connected to the annular grooves. Sources of information taken into account in the examination 1. USSR author's certificate 50 No. 626225, cl. E 21 D 23/16, 1975. ./ sixteen  x h Woo X / X h Tch. N / h v h hl / x h x x hl / x x