RU2282033C2 - Hydraulic control unit for powered support section control - Google Patents

Abstract

FIELD: mining, particularly hydraulic systems of mine support sections.

SUBSTANCE: unit comprises at least one switch assembly having delivery channel, discharge channel and target orifices of two target valve assembly switches built in the body. Each valve assembly includes spring-loaded delivery valve, which periodically communicates target orifice with delivery channel and discharge channel and discharge valve with working end surface, which periodically communicates address orifice with discharge channel by displacement thereof. The unit also comprises communicating panel with channels to connect delivery and discharge channels of one or several switches with delivery and discharge channels of supply block. The supply block has sockets adapted to be connected to delivery and discharge pipelines. Target valve assemblies include delivery valve axially aligned with address orifice, radial orifices and discharge valve, which may close delivery valve end and move towards address orifice by working end surface. Delivery valve is made as hollow cylinder provided with annular working surface located in delivery valve center. The annular working surface contacts seat. Discharge valve is made as piston displaced by pressure change via inner channels through corresponding control valve built in switch body and connected to delivery and discharge channels. Each switch has rectangular shape and threaded orifices to provide switch usage in modular hydraulic units.

EFFECT: increased operational efficiency, reduced repair time, simplified structure, possibility of unit application in automated support control systems.

3 cl, 11 dwg

Description

The invention relates to the mining industry and is intended for use in hydraulic systems of mine mechanized roof supports used in underground coal mining.

Known cartridge valve DN20 (catalog, Appendix No. 1) of the company "marco" GmbH (Germany), which has a pressure supply through an internal hole in the valve, coaxial with the address hole. The locking elements are: a saddle fixed in a collapsible cartridge case; a pressure-closing valve made in the form of a cylinder with an internal hole on the address side, with an external annular flange with a contacting working surface and radial holes for fluid flow into the internal hole; the valve locking the drain, made in the form of a sleeve with an end working contact surface. Its disadvantages:

1. The screwed case requires increased precision in manufacturing parts and locking the threaded connection with special glue, which increases manufacturing costs;

2. The impact of cyclic loads on the saddle from different sides contributes to its buildup and premature failure, which leads to a decrease in operational properties, and also requires the use of plastics for saddles with improved mechanical characteristics;

3. When creating block control systems for this type of single valve cartridges, a massive switching body with a complex channel system is required, which increases the weight of the block and the complexity of its manufacture;

4. The valve cartridge does not provide mechanical control, which reduces the versatility of the design.

Known control units of firms "DAMS", "Tiffenbach", "SAARtech" (Germany), which consist of a complex switching housing and adjacent working valves, control pilots and electro-hydraulic switches. The disadvantages of the blocks produced by these companies are the many components, the complexity of the design during manufacture, increased operating costs, high cost of products.

Known manual control blocks of the company "Georit" (Poland) and the hydrodistributor of powered support AC No. 1834977, class. E 21 D 23/16, which consist of double switches, switched on alternately by the handle and mounted on a commutating plate having channels “pressure” and “drain”, and address sockets for connecting hoses.

The disadvantages of these blocks are the necessity of applying great efforts on the handles, large stresses on the working surfaces of the switching mechanism, large hydraulic resistance, small passage sections of the channels. This creates inconvenience in work, premature failure and limited use of blocks.

Known control units of the Giprouglemash design in Moscow, consisting of a commutating plate with pressure and drain sockets and addresses on which hydraulic sectional distributors are mounted on the lower side, electrohydraulic switches that are connected through channels through the plate control with the CSG.

Distributors can operate in manual and automated modes of support management. Disadvantages:

1. The horizontal arrangement of the valves in the distributor limits the number of unit addresses due to the overall width;

2. Valves have small and complex cross-sections, which leads to large pressure losses and limited use in large supports;

3. Large efforts on the handles cause inconvenience in work and quick fatigue of staff.

A device is known for the hydraulic control system for powered support AC No. 1493795, class. E 21 D 23/16, which has valves normally open (drain) and normally closed (pressure), which are located in a common housing and have cam-type switching mechanisms with a rotary handle fixing with a spring ball.

The disadvantage of this device is that for the execution of pressure and discharge commands, two valves are used, and not one, which increases the overall dimensions.

All valves are mounted in a common housing and consist of separate parts, which, if one of the valves fails, causes significant downtime during repairs in the mine.

The design of the valves has small bore sections, which limits the use of the device for large supports.

The closest in essence is the hydrodistributor of the section of mechanized lining, RF patent No. 2199013, class. E 21 D 23/16, is a housing made with pressure and drain chambers, a consumer chamber and a bore, in which a stopper, coaxially arranged spool with o-rings and a spring-loaded protective cap, a sleeve and a sleeve with a piston and a pusher are installed in the bore . A pilot control piston is installed in the bore of the sleeve, in the bore of which there is a spool with a spring ring restricting its movement relative to the piston, and a support ring installed with the possibility of displacement of the piston and interaction with the spool during axial movement of the latter. The spool is made with grooves under the control elements, one of which is in constant interaction with the protective cap. The plug is connected to the sleeve by means of a threaded connection. A control channel is made in the valve body for supplying pressure under the pilot control piston. A stopper, a protective cap, a sleeve, a sleeve, a piston, a lock ring, a pilot control piston, a pusher, a spool, a thrust ring and a spring form a monoblock inserted into the housing and secured by a latch. The disadvantages of this valve are:

1. a large number of parts and seals, the complexity of their performance reduce the reliability and make repair difficult;

2. small size, complexity of the shape of the channels lead to large water losses;

3. channel directions make it difficult to use switches in compact modular designs.

All valves are mounted in a common housing and consist of separate parts, which, if one of the valves fails, causes significant downtime during repairs in the mine.

The design of the valves has small bore sections, which limits the use of the device for large supports.

The objective of the invention is to eliminate the disadvantages of the above devices, increase operating efficiency and reduce the time for equipment downtime due to the construction of a modular type control unit for a section of a mechanized shaft support (hereinafter block).

The second objective of the invention is, along with the first task, to simplify the design of the unit with small efforts to turn on valve devices that occur at low pressure head and small diameters of the channels.

The third task is, along with the first, the implementation of the possibility of using the unit in automated control systems for supports.

The technical result for solving the first problem is achieved in that the hydraulic control unit of the mechanized shaft support section, comprising several or one switch having a pressure channel, a discharge channel and address holes of two address valve devices mounted in the switch housing, each of which includes a spring-loaded pressure valve for periodic communication of the address hole with the pressure channel and the discharge channel, the relief valve with a working end surface, which is installed for the communication of the address hole with the discharge channel by moving it, is equipped with a switching plate with channels for connecting the pressure channels and resetting one or more switches with the pressure channels and resetting the power supply, having sockets for connecting to the pressure and discharge lines, while the address valve devices have a pressure valve located on the same axis with the address hole, made in the form of a hollow cylinder having in the middle part a working annular surface in contact with the seat, dial holes and installed with the possibility of overlapping its end and moving towards the address hole with the working end surface of the relief valve, made in the form of a piston, moved by supplying and depressurizing the internal channels through the corresponding control valve, mounted in the switch housing and connected to the pressure channels and discharge, with each switch having a rectangular shape and threaded holes to allow its use in modular hydraulic units type.

The technical result in solving the second problem is achieved by the fact that the relief valve is made with a shank to allow it to be moved mechanically, while the housing sockets with valve device parts are closed by a cover attached to the housing by screws that simultaneously attach removable stops, the address valve devices are eccentric relative to located in the cover of the rotary axis having a flange for contact with the shank of the relief valve of each valve device to move it when the axis a handle rigidly fixed to the axis, installed to turn on the upper valve device by turning it up, the lower valve device by turning it down with the possibility of returning to its original position with the stops installed, and when the stops are removed, with the possibility of holding the valve devices in the on position by locking the valve dump the cylindrical surface of the rotary axis due to friction.

The technical result for solving the third problem is achieved by the fact that the unit is equipped with electro-hydraulic valves for using the unit in automated control systems for the support.

The invention:

Figure 1 shows a front view of the hydraulic control unit section of the mechanized mine lining (hereinafter block), (1); figure 2 shows a section aa (see figure 1) of the block (item 1); figure 3 shows a rear view of the block (item 1); figure 4 shows a section of a block (p. 2); figure 5 shows a view In (see figure 4) of the block (item 2) with the position of the handle "off"; figure 6 shows a view In (see figure 4) of the block (p. 2) with the position of the handle "included without fixing"; in Fig.7 shows a view In (see Fig.4) of the block (p.2) with the position of the handle "included with fixation"; in Fig.8 shows a front view of the block (item 3); figure 9 shows a diagram of a hydraulic circuit block (claim 1); figure 10 shows a diagram of a hydraulic circuit block (p. 2); figure 11 shows a diagram of a hydraulic circuit block (p. 3); where claim 1, claim 2, claim 3 - claims according to distinguishing features.

The block (p. 1), see FIGS. 1, 2, 3, 9, is a modular design, including a power block 1, a switching plate 2, connecting bolts 3, switches 4, consisting of a chip 5 connected to the switch housing 6 and mounted in the case of each switch of two address valve devices, which include: pressure valve 7, spring 8, seat 9, spacer sleeve 10, relief valve 11, control valve 12 and plug 13.

The operation of the unit is as follows. When you turn on the first control valve 12, connected to the pressure and discharge channels of the switch, the fluid pressure is supplied through the channel "X1" and moves the relief valve 11, which closes from the end of the inner hole in the pressure valve 7, blocking the connection between the address "A1" and reset " T ". With further movement, the relief valve 11 moves the pressure valve 7 towards the channel "A1", the outer annular contact surface of which moves away from the seat 9, compressing the spring 8, and the working fluid from the channel "P" through the radial holes enters the inner hole of the pressure valve 7 and further to the address "A1". When the control valve 12 is turned off, the control pressure is released, the relief valve 11 ceases to be pressed against the end surface of the valve 7 and opens the connection between the channels "A1" and "T". Under the influence of the spring 8 and the pressure of the pressure valve 7, the outer annular surface is pressed against the seat 9 and closes the connection between the pressure "P" and the address "A1". The operation of the second valve device of the switch is carried out similarly by turning on (off) the second control valve 12 with a pressure supply to the channel "X2". Switching on is carried out by pressing the control valve, switching off - by removing the load from the control valve (releasing). This design ensures the independent operation of each valve device of any switch.

The block (item 2), see FIGS. 4, 5, 6, 7, 10, is a similar modular design with the same address valve devices as the unit (item 1), the relief valve is made with a shank (see figure 4, pos. 14) for the possibility of its movement by mechanical means, the sockets in the switch housing with the details of the address valve devices are closed by a cover 15, attached to the case by screws 16, which simultaneously fasten the removable stops 17, in the cover there is a rotary axis 18 with a handle 19 rigidly fixed to it while addressable valve devices laid eccentrically relative to the pivot axis 18, on which there is a flange in contact with the tail of the relief valve 14.

The operation of the unit is as follows. When turning up the handle 19 and, respectively, the axis 18, the flat of the axis presses on the shank of the relief valve 14 and moves it (see Fig. 6), including the upper valve device without fixing when the stop 17 is installed, since the handle 19 when it is released under the influence of the spring 8 of the valve device and the pressure of the pressure returns to its original position (see figure 5). When the stop 17 is removed, the axis 18 is rotated by a larger angle and locks the tail of the relief valve 14 with a cylindrical surface, while the handle 19 does not independently return to its original position (see Fig. 7), being kept in the on position due to friction forces on the cylindrical surface of the axis 18 , providing inclusion with fixation.

When the handle 19 is turned down, the lower valve device is likewise turned on (off).

Easy restructuring of fixed and non-fixed switching on of valve devices expands the functionality of the application of the block (item 2).

The block (p. 3) see Fig. 8, 11 is a block (p. 1) with electro-hydraulic valves 20 additionally installed on the switches.

The operation of valve devices in this case is carried out by turning on the control valves manually or by turning on the electro-hydraulic valves by applying electrical signals.

This design provides the versatility of controlling the unit with the possibility of its use in automated control systems for the support.

Claims (3)

1. The hydraulic control unit of the mechanized shaft support section, comprising several or one switch having a pressure channel, a discharge channel and address holes of two address valve devices mounted in the switch housing, each of which includes a spring-loaded pressure valve for periodically communicating the address hole with the pressure channel and a reset channel, a reset valve with a working end surface, which is installed for periodic communication of the address hole with the reset channel by movement, characterized in that it is equipped with a switching plate with channels for connecting the pressure head and dumping one or more switches with pressure channels and resetting the power supply, having sockets for connecting to the pressure and discharge lines, while the address valve devices have a pressure valve located on one axis with the address hole, made in the form of a hollow cylinder having in the middle part a working annular surface in contact with the seat, radial holes and installed with the possibility overlapping its end and moving toward the address hole with the working end surface, a relief valve made in the form of a piston, moved by supplying and depressurizing the internal channels through a corresponding control valve mounted in the switch housing and connected to the pressure and discharge channels, each the switch has a rectangular shape and threaded holes to allow its use in modular type hydraulic units. 2. The block according to claim 1, characterized in that the relief valve is made with a shank for the possibility of its mechanical movement, while the housing sockets with valve device parts are closed by a cover attached to the housing by screws that simultaneously attach removable stops, the address valve devices are located eccentrically relative to the rotary axis located in the cover having a flange for contact with the tail of the relief valve of each valve device to move it when the axis is rotated with the handles rigidly fixed to the axis oh, installed to turn on the upper valve device by turning it up, the lower valve device by turning it down with the possibility of returning to its original position with the stops installed, and when the stops are removed, with the possibility of holding the valve devices in the on position by locking the relief valve with a cylindrical rotary surface axis due to friction. 3. The block according to claim 1, characterized in that electro-hydraulic valves are installed on the switches of the block for use of the block in automated control systems for the support.

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