PL217157B1 - Valve system for housing base stand and a combination of two housing base stands for a valve system - Google Patents

Description

Description of the invention

The present invention relates to a valve system for a housing base rack and a combination of two housing base racks for a valve system.

A valve system of this type is known from DE 10 2005 025 917 A1.

Although this known valve arrangement is suitable for high pressures and / or flow rates, in underground operation, more and more often stands are required which have even larger cross sections. However, the known valve arrangement is not suitable for such large props.

It is therefore the object of the present invention to improve a valve arrangement of the type mentioned at the outset in such a way that props with very large cross sections can be controlled with the lowest possible flow rate.

A valve system for the base stand of the housing comprising two openable check valves connected in parallel, the first check valve being connected with its input back to R, and the second non-return valve connected by its input to the control port A1 of the valve, and on the outlet side they are connected to the connector A 'plunger surface of the rack according to the invention is characterized in that at least one further openable non-return valve is provided in parallel, which is connected on the outlet side to the port A' of the plunger surface of the rack, and is connected with its input to the return R or to with the valve's control connection A2.

Preferably, a third openable non-return valve connected in parallel is provided on the inlet side with the port A 'of the plunger surface of the pedestal and which is connected through its input to the return R, a fourth parallel connected non-return valve is provided which is connected on the outlet side. with port A 'of the plunger surface of the stand and which is connected with its input to the control port A2 of the valve.

Preferably, the input of the further openable check valve is connected to the output of an additional openable check valve, the input of which is connected to the valve control connection A2, the connection between the further openable check valve and the additional check valve being connected to the toroidal surface connection of the pump cylinder.

Preferably, the piston surface connection of the pump cylinder is connected to the control connection A3 of the valve.

Preferably, the plunger surface connection of the pump cylinder is connected to the inlet of the second check valve.

Preferably, the pump cylinder is a lifting cylinder for a housing base skid.

Preferably, the unblocking port of each check valve is connected to port B 'of the toroidal surface of the rack.

Preferably, all openable check valves are located in a common valve block.

A combination of two housing base pedestals and a pump cylinder for a valve system, preferably where the pump cylinder comprises two stepped pistons which are coaxially arranged in a common housing, each piston forming a piston chamber and a toroidal chamber, the housing having two toroidal surface connections. which are connected to port A 'of the plunger surface of each stand.

Preferably, each piston is provided with a through hole into which a connecting rod is inserted, which has a driver between the pistons.

Preferably, the connecting rod is tightly guided in the through holes.

The solution according to the invention provides a number of advantageous effects, in particular due to the fact that at least a second openable, parallel-connected non-return valve is provided which is connected at the output side with the connection (connecting element) of the plunger surface of the stand and which is connected back or with valve control connection.

The invention is based on the results of research that the provision of a cascade of parallel connected openable check valves provides the possibility of maximizing the flow when removing (robbing) the rack and at the same time increasing the main pressure. If the second openable check valve connected in parallel is connected back through its inlet, the flow is increased as a result during the removal (robbery). If a second openable check valve connected in parallel is connected to the control port of the valve, the deposition flow can be increased. Alternatively, this second non-return valve can be used to increase the main pressure by means of the pump cylinder.

Advantageous embodiments of the invention can be found in the description, the drawing as well as in the dependent claims.

According to a first preferred embodiment, two further openable non-return valves are provided in parallel, namely a third and a fourth non-return valve, both of which are connected at the output side to the connection (connecting element) of the piston surface of the stand. Thus, the third non-return valve is connected by its input back and the fourth non-return valve is connected by its input to the valve control connection. In this embodiment, a cascade is formed of a total of four openable check valves in parallel, where two check valves may be used for deposition, and for purging, flow is through all four parallel-connected check valves.

According to a second preferred embodiment, the input of a further second openable check valve may be connected to the output of an additional openable check valve, the input of which is connected to the control port of the valve, the connection between the second and the additional backflow valve being connected to the toroidal surface connection of the pump cylinder. Such an additional check valve, which is connected in series with the second check valve, makes it possible to use a gear pump to gradually pressurize the stand. The gear pump can preferably be designed as a pump cylinder, whereby the connecting element (connection) of the piston surface of the pump cylinder can be connected to the control port of the valve. By supplying this pressure control connection, the pump cylinder is extended so that an increased pressure is set on the connecting element of the toroidal surface, which can then be transmitted to the connection (connecting element) with the surface of the plunger of the stand by means of a connection between the second additional check valve. By actuating the pump cylinder multiple times, the pressure in the rack can be increased until the desired pressure in the rack is achieved.

According to a further preferred embodiment, the connecting element (port) to the piston surface of the pump cylinder can also be connected to the inlet of the second openable check valve, so that with the stand already seated, the pressure in the stand continues to increase, which causes the piston surface connecting element (port) to be energized. main pressure.

According to another preferred embodiment, the pump cylinder may be a base lift cylinder for a housing base skid. Such a common cylinder on the base of the housing can therefore be used to increase the main pressure. However, such a lifting cylinder, due to its design, is often not suitable for this function. For this reason, it may be advantageous to provide a separate pump cylinder for increasing the main pressure.

In order to advantageously increase the main pressure in both pedestals in the case of a housing base with two pedestals, a pump cylinder is provided according to the invention, which has two stepped pistons which are arranged coaxially in a common housing, each piston having a piston surface and a toroidal surface, and the housing has two connecting members (ports) with the toroidal surface which are connected with the connecting member (port) with the piston surface of each stand. As a result of the alternating supply of connections (connecting elements) to the surface of the piston of the pump cylinder in such a system, the main pressure in both stands can be gradually increased.

In order to achieve automatic retraction of the two pistons even when the second piston has not fully traveled through the stroke of the pump piston, according to another preferred embodiment, each piston may be provided with a through-bore into which a connecting rod is inserted which has a receiving element arranged between the pistons. Such a connecting rod, which is tightly guided in these openings, enables each piston to move back separately, since the connecting rod is first pressurized and by means of its take-off element it returns the piston to its end position. As the second piston is disengaged from the connecting rod, it does not need to travel the full stroke of the pump piston to retract the second piston to its starting position.

The above-mentioned valve control connection is understood in the mining industry as the usual outlet of the main control valve or another suitable valve by means of which the supply of pressurized hydraulic fluid is switched on.

PL 217 157 B1

The subject of the invention is shown in the drawing in which Fig. 1 shows the valve arrangement in the first embodiment, Fig. 2 shows the valve arrangement in the second embodiment, and Fig. 3 - a longitudinal section of a pump cylinder.

Fig. 1 shows schematically the arrangement of two uprights 10, 11, not shown in detail, of the base of the underground mining casing. Since the devices for controlling the uprights 10 and 11 in the arrangement shown in Fig. 1 have the same structure, only the valve arrangement for controlling the uprights 10 on the left is described below in detail.

The control of the connection A1 of the plunger surface of the plunger 10 takes place by means of a valve block 20, in which, in the embodiment shown, a total of five openable check valves are provided, four of which are connected in parallel and two are connected in series. The connecting piece / port B 'of the toroidal surface of the rack 10 is connected directly to the control port B of a valve not shown. A reset line 18 is also led from this connection to all openable connections of the check valves.

In the valve block 20, in the exemplary embodiment shown, four openable check valves 22, 24, 26 and 28 are provided, which with their output are connected to the port A 'of the plunger surface of the stand 10. The excess pressure valve 12, the pressure gauge 14 are also connected with this conduit. and a pressure sensor 15, the electrical output of which is connected to the connector D of the central control device. A 13 anti-throttle valve is also provided.

The input, viewed in the direction of the port, of the first openable check valve 22 is connected to the return R. Also, the input of the second openable check valve 24 is connected to the return R. The input of the third openable check valve 26 is connected to the valve control port A1. Also, the input of the openable check valve 28 is connected to the control connection A2 of the valve. However, there is a fifth openable check valve 30 in the line, the input of which is connected to the control port A1 and the output of which is connected to the input of the check valve 28. In other words, the check valves 28 and 30 are connected in series. The connection between the two check valves 28 and 30 in turn is connected by a connection (connecting element) on the toroidal surface of the pump cylinder, which in the illustrated embodiment is a lifting cylinder 40 for the skids of the housing base. The connecting element / toroidal surface connection of the lifting cylinder 40 is also connected to a valve arrangement not described in detail for the right-hand pole 11 and opens there also at the junction of the two serially connected openable check valves. The piston surface connection of the lifting cylinder 40 is in turn connected to the valve control port A3.

The functions of the control valves for actuating the rack 10 and the lifting cylinder 40 are as follows:

B removing (robbing) the rack

A1 for inserting the stand

A2 to set the stand and start the lifting cylinder

A3 Actuating the lifting cylinder or increasing the pressure in the lifting cylinder with the stand seated.

In order to remove (rob) the stand 10, the control port B is pressurized, and then all check valves 22-30 are opened by means of the unblocking line 18, so that the hydraulic fluid from the piston chamber of the stand 10 can drain through all four lines connected in parallel. As a result, the control valves on ports A1 and A2 are connected in such a way that they are connected back.

Port A1 is pressurized to seat the pedestal 10, and the hydraulic fluid flows through the check valve 26 into the piston chamber of the pedestal. By means of the control port A2, hydraulic fluid can additionally be supplied via check valves 28 and 30 into the plunger chamber of the stand.

With an already seated pedestal, the main pressure can be increased, which causes the control port A3 to be pressurized. Thereby the lifting cylinder 40 is actuated and the hydraulic fluid flows under pressure through the check valve 28 via the check valve 28 into the plunger chamber of the stand 10 by the subsequent actuation of the control valve A2. The lifting cylinder 40 is released again by means of the toroidal chamber conduit of the lifting cylinder 40. set back, so that another stroke of the pump can be carried out until the desired bar pressure is obtained.

PL 217 157 B1

Since the design of the lifting cylinder for the housing base is not always suitable as a pump cylinder, a separate pump cylinder can also be provided in accordance with a further embodiment not shown. In this case, it can be advantageous if the piston surface connection of the pump cylinder is not fed separately to the control port A3, but is connected to the input of the openable non-return valve 26, i.e. to the control port Α1. Then the control connection can be used to seat the rack and with the rack seated to increase the main pressure for both racks. With this design, the main pressure can be uniformly increased in both stands. Supply pressure is used to retract the pump cylinder. In turn, it can work more efficiently here in connection with the pump cylinder described in FIGS. 2 and 3 below.

Fig. 2 shows a further embodiment of a valve arrangement which, apart from the pump cylinder of the arrangement described in Fig. 1, is identical. Thus, the same reference numbers are used for the same parts and the system is not described in detail once more.

The valve arrangement shown in Fig. 2 differs from that shown in Fig. 1 in that a counter-rotating pump cylinder 50 is provided, which is shown enlarged in Fig. 3. The pump cylinder 50 has two stepped pistons 52 and 54 that are arranged coaxially in a common housing 56. Each piston 52, 54 has a larger diameter peripheral section and a smaller diameter peripheral section, the pistons being arranged with sections of of the smaller diameter are opposite to each other, so that inside the pump cylinder 50 a chamber is formed which is associated with the piston surface 58 associated with the piston 52 and a chamber associated with the piston 54 due to the surface of the piston 60.

The housing 56 is sealed at its ends by two covers 62 and 64, both covers each having a through hole which forms a piston surface port 66 for the piston 52 and a piston surface port 68 for the piston 54. Inside the housing 56 between the piston 52 and housing 56 a first toroidal chamber 70 is formed, and a second toroidal chamber 72 is formed between the piston 54 and the housing 56. Furthermore, the pump piston 50 has a first toroidal chamber port 74 through which a pressure fluid can flow out of the toroidal chamber 70. there is a second toroidal chamber port 76 from which the pressure fluid from the second toroidal chamber 72 can flow out. Both pistons 52 and 54 are sealed at both ends of the housing.

Moreover, as shown in Fig. 3, both the pistons 52 and 54 are each provided with coaxial through holes 78 and 80 in which a common connecting rod 82 is sealed. The connecting rod 82 has at its center an abutment flange 84 of a driver by means of which each the pistons can be displaced if the chamber resulting from the piston surface of each second piston is pressurized.

The operation of the pump cylinder 50 depicted in Fig. 3 is as follows. If, as a starting point, the position shown in Fig. 3, the port 66 of the piston surface is pressurized, the pressure moves the piston 52 in Fig. 3 to the right, whereby pressurized hydraulic fluid is pumped from the toroidal chamber 70 through the port 74 of the chamber. toroidal. At the same time, the connecting rod 82 is pressurized and moves the plunger 54 to its right position as the driver abutment 84 moves against it as far as it will go. If then the piston surface port 68 of the pump piston 50 is pressurized and the piston surface port 66 is reconnected, the hydraulic fluid flows in the bore 80 and moves the connecting rod 82 in Fig. 3 to the left until the flange 84 of the driver moves against it. against the piston 52, and this also pushes to the left. Simultaneously, the piston 54 is pressurized and moves to the left whereby the hydraulic fluid under pressure exits the toroidal chamber 72 through the port 76 of the toroidal chamber. In order that when the hydraulic fluid enters each chamber resulting from the surface of the piston 58 or 60, the hydraulic fluid is distributed evenly over each piston, the two pistons 52 and 54 on their lower side are provided with a circumferential abutment collar lying outwards in the radial direction, which creates a small gap. between the bottom surface of the piston and covers 62 and 64.

As shown in Fig. 2, the pump cylinder 50 is connected with its piston surface port 66 to the control port A1, which is also connected to the inlet of the non-return valve 26. The connection element 74 of the toroidal chamber 74 of the pump cylinder 50 is connected to the connection between the two non-return valves 28 I. 30. A suitable valve arrangement is also provided in the valve arrangement for the rack 11 on the right side.

PL 217 157 B1

In the valve arrangement shown in Figure 2, the pump cylinder 50 can be actuated from both sides and both pistons 52 and 54 are moved to their starting position. Due to the connecting rod 82 and the carrier stop 84 of the driver, each piston is completely retracted to its starting position, even if the other piston would not complete its stroke. In this arrangement, no means of generating pressure has to be used, only for the piston to return to its starting position. If only one stand is to be pressurized, only half of the pump can be started as well.

It should be pointed out that the above-presented embodiments are only exemplary and are not limiting to the number of openable check valves shown used.

List of reference symbols

10, 11 12 13 14 15 20 22 40 50 52,

58, 62, 66, 70, 74, 78,

84 A '

B '

A1 R D

A2, A3, B stand pressure relief valve anti-pressure valve manometer pressure sensor valve block openable check valve lifting cylinder pump cylinder piston housing chamber resulting from the piston surface cover of the piston surface connections toroidal chamber toroidal chamber connections through-hole connecting rod connecting rod stop flange piston surface connection connection toroidal chamber control ports return pressure sensor

Claims (11)

Patent claims 1. A valve system for the base stand of the housing comprising two openable check valves connected in parallel, the first check valve being connected via its input to the R return, and the second check valve being connected via its input to the valve control port A1, and connected on the outlet side with a connection A 'of the surface of the plunger of the rack, characterized in that at least one further openable non-return valve (22, 28) is connected in parallel, which is connected on the outlet side with the connection (A') of the surface of the plunger of the rack (10), and it is connected with its input back to or (R) with the control connection (A2) of the valve. 2. The valve system according to claim 1 A non-return valve according to claim 1, characterized in that a third openable non-return valve (22) is provided in parallel which is connected on the inlet side to the connection (A ') of the piston surface of the stand (10) and which is connected to the return (R) by its input, whereby a fourth non-return valve (28) connected in parallel is provided, which is connected on the outlet side with the connection (A ') of the piston surface of the stand (10) and which is connected through its input with the control connection (A2) of the valve. 3. The valve system according to claim 1 The method of claim 1, characterized in that the input of the further openable non-return valve (28) is connected to the output of an additional openable non-return valve (30), the input of which is connected to the control connection (A2) of the valve, the connection between the further openable non-return valve (28) and the additional a check valve (30) is connected to a toroidal surface connection of the pump cylinder (40, 50). PL 217 157 B1 4. The valve system according to claim 1 The method of claim 3, characterized in that the piston surface connection of the pump cylinder (40, 50) is connected to the control port (A3) of the valve. 5. The valve system according to claim 1 The method of claim 3 or 4, characterized in that the piston surface connection (66) of the pump cylinder (50) is connected to the input of the second non-return valve (26). 6. A valve system according to claim 1 The pump as claimed in claim 3 or 4, characterized in that the pump cylinder is a lifting cylinder (40) for the base skids of the housing. 7. The valve system according to claim 1 The method of claim 1, characterized in that the unblocking port of each check valve (22-30) is connected to the port (B ') of the toroidal surface of the rack (10). Valve arrangement according to one of the claims 1 to 5. Device according to any one of the preceding claims, characterized in that all openable check valves (22-30) are arranged in a common valve block (20). A combination of two supports (10, 11) for a housing base and a pump cylinder (50) for a valve arrangement according to claim 1. The pump as claimed in claim 3, characterized in that the pump cylinder (50) comprises two stepped pistons (52, 54) that are coaxially disposed in a common housing (56), each piston (52, 54) forming a piston chamber (58, 60) and a toroidal chamber (70, 72), the housing (56) having two toroidal surface ports (74, 76) which are connected to a piston surface port (A ') of each stand (10, 11). 10. The combination according to claim 1 9. The piston as claimed in claim 9, characterized in that each piston (52, 54) is provided with a through hole (78, 80) into which is inserted a connecting rod (82) which has a driver (84) disposed between the pistons. 11. The combination according to claim 1 The device of claim 10, characterized in that the connecting rod (82) is sealed in the through holes (78, 80).