UA93415C2 - Valve arrangement - Google Patents

Abstract

A valve arrangement for plunger of support frame in mining industry, has check valves connected at output side with piston surface line of plunger, where inputs of check valves are connected with return line and/or control line, respectively.

Description

and attached drawings. They depict:

Fig. 1 - The first form of execution of the valve device;

Fig. 2 - The second form of execution of the valve device and

Fig. C - Longitudinal section of the pumping cylinder.

Fig. 1 schematically depicts a device consisting of two hydraulic risers 10, 11, not shown in more detail, of a section of a mechanized mount for mining. Since the devices for controlling the risers 10 and 11 in the design shown in fig. 1 are the same, only the valve device for controlling the left riser 10 will be discussed in detail below.

The control of the connecting element A' for the surface of the piston of the riser 10 is carried out through the valve block 20, where there are provided - in the illustrated embodiment - a total of five unlockable non-return valves, four of which are connected in parallel, and two in series. The connecting element B' for the toroidal surface of the riser 10 is connected directly to the controlling connecting element B of the valve not shown. A release line 18 also leads from this connection element to all release connection elements for release-capable non-return valves.

In the valve block 20 there are provided - in the illustrated embodiment - four unblockable non-return valves 22, 24, 26 and 28, and all of them are connected by their outlets to the connection element A" for the surface of the piston of the riser 10. This line also connects the safety valve 12, manometer 14 and pressure sensor 15, the electrical output of which leads to the connecting element Y of the central control unit.

The inlet - viewed in the flow direction - of the first unblockable check valve 22 is connected to the return line B. Also, the inlet of the second unblockable check valve 24 is connected to the return line A. The inlet of the third unblockable check valve 26 is connected to control connecting element Ai of the valve. Also, the input of the unlockable non-return valve 28 is connected to the control connecting element A2 of the valve. Of course, there is also a fifth unlockable non-return valve 30 on this line, the input of which is connected to the control connecting element AT, and the output is connected to the input of the non-return valve 28.

In other words, check valves 28 and 30 are connected in series. The connecting line between these two non-return valves 28 and 30 is again connected to the connecting element for the toroidal surface of the pumping cylinder, which in this embodiment is a lifting cylinder 40 for slides of the mechanized mounting section. The connecting element for the toroidal surface of the lifting cylinder 40 is also connected to the valve device for the right riser 11, which is not described in more detail, and ends there at the connection point of both sequentially enabled unlockable non-return valves. The connecting element for the surface of the piston of the lifting cylinder 40 is again connected to the controlling connecting element AZ of the valve.

The functions of the distribution valves for controlling the riser 10 and the lifting cylinder 40 include the following operations:

B - unloading of the hydraulic riser

A1 - loading hydraulic riser

A2 - loading of the hydraulic riser and activation of the lifting cylinder

AZ - activation of the lifting cylinder or pressure increase when the hydraulic riser is unloaded.

To unload the riser 10, pressure is applied to the control connecting element B, after which, with the help of the unlocking line 18, all check valves 22-30 are unlocked, as a result of which the working fluid can leave the piston chamber of the hydraulic riser 10 along all lines connected in parallel. To do this, the distribution valves are turned on at the connecting elements A1 and Ag so that the latter are connected to the return line.

To load the riser 10, pressure is applied to the connecting element Ai, after which the working fluid flows through the check valve 26 into the piston chamber of the hydraulic riser. Additionally, through the control connecting element A2, the working fluid through the check valves 28 and 30 enters the piston chamber of the hydraulic riser.

In an already loaded riser, the pressure can be increased by applying pressure to the AZ control connection element. This activates the lifting cylinder 40, and the working fluid with increased pressure along the annular line of the lifting cylinder 40 is directed through the check valve 28 into the piston chamber of the hydraulic riser 10. Then, by operating the distribution valve A2, the lifting cylinder is drawn back again, so that a new working operation can be carried out stroke until the desired pressure is provided in the riser.

Since the lifting cylinder of the mechanized mounting section is not always suitable for use as a pumping cylinder due to its design, a separate pumping cylinder can be provided according to another, not shown, embodiment. At the same time, it may be beneficial that the connecting element for the piston surface of the pumping cylinder is not connected to a separate control connecting element AZ, but is connected to the input of the unlockable non-return valve 26, that is, to the control connecting element A7i. This control attachment can then be used to load the hydraulic riser and then pressurize both risers. With such a design, the pressure can be increased only evenly in both risers. Free pressure is used for the reverse movement of the pumping cylinder. The pumping cylinder, described below in more detail when considering fig. 2 and 3, may work more effectively here.

Fig. 2 shows a further variant of the valve device, which is identical to the design of fig. 1, except for the pumping cylinder. Therefore, the same reference signs are used for the same parts, and the construction is not described again in detail.

The valve device according to fig. 2 differs from the one shown in fig. 1 in that it provides a counter-pumping cylinder 50, shown in detail in fig. With in an enlarged form. Pumping pump 50 has two cascade pistons 52 and 54 arranged coaxially in a common housing 56. Each piston 52, 54 has a larger diameter circumferential section and a smaller diameter circumferential section, the pistons being arranged so that the smaller diameter sections are opposite each other. one, so that inside the pumping cylinder

50 there are a cavity 58 subordinate to the piston 52 and a cavity 60 subordinate to the piston 54.

The body 56 is hermetically sealed at its ends by covers 62 and 64, and both covers are provided with one through hole each, which form the connecting element 6bb for the piston 52 and the connecting element 68 for the piston 54. Inside the body 56, between the piston 52 and the body 56, a first annular cavity 70, and a second annular cavity 72 is formed between the piston 54 and the housing 56. In addition, the cylinder piston 50 has a first connecting element 74 for the annular cavity through which the working fluid can flow out of the annular cavity 70. Further, a second connecting element 76 for the annular cavity is provided cavity through which the working fluid can flow out of the second annular cavity 72. Both pistons 52 and 54 travel in the housing, being hermetically sealed at both ends.

As can be seen further in fig. 3, both pistons 52 and 54 have a through hole 78 and 80 in the center through which a common connecting rod 82 passes with a seal. the other piston is under pressure.

Shown in fig. C the pumping cylinder 50 functions as follows: when, based on the shown in fig. From the position, the connecting element 66 for the piston surface is loaded with pressure, then this pressure moves the piston 52 to the right, as a result of which the working fluid with increased pressure is pumped from the annular space 70 through the connecting element 74. At the same time, the connecting rod 82 is loaded with pressure and moves the piston 54 in its right end position as the leash collar 84 hits it. When the connecting element 68 for the surface of the pumping cylinder 50 is then loaded with pressure, and the connecting element for the surface of the piston 66 communicates with the return line, the working fluid is directed into the through hole 80 and moves the connecting rod 82 in FIG. To the left until the leash shoulder 84 hits the piston 52 and causes it to move to the left as well. At the same time, the piston 54 is loaded with pressure and moves to the left, as a result of which the working fluid with increased pressure flows out of the annular cavity 72 through the connecting element 76. In order that when the working fluid enters the corresponding piston chamber 58 and 60, the working fluid is evenly distributed over the corresponding piston, both the pistons 52 and 54 have a radially outwardly projecting peripheral shoulder on their lower side which forms a small distance between the bottom of the piston and the caps 62 and 64.

As shown in fig. 2, the cylinder 50 with its connecting element 6b for the piston surface communicates with the control connecting element Ai!, which is also connected to the inlet of the check valve 26.

The connecting element 74 for the annular cavity of the pumping cylinder 50 communicates with the connecting line between both check valves 28 and 30. The corresponding design also takes place in the valve device for the right hydraulic riser.

In the design shown in fig. 2, the pumping cylinder 50 can operate alternately in both directions, and both pistons 52 and 54 alternately return to their original positions. With the help of the connecting rod 82 and the leash collar 84, this piston is completely returned to its initial position, even when the other piston does not have to completely overcome its stroke. With such a design, it is not necessary to use a working fluid just to send the pistons to their initial position. Since only one riser is to receive increased pressure, only half of the pump can operate.

It should be noted that the above-described embodiments are only examples and are not limited to the number of unblockable non-return valves.

Positional designations 10, 11 - hydraulic riser 12 - safety valve 13 - mining shock valve 14 - manometer - pressure sensor 20 - valve block 22-30 - unlockable check valve - lifting cylinder - pumping cylinder 52, 54 - piston 56 - housing 58, 60 - gap in front of the piston surface 62, 64 - cover 66, 68 - connecting element for the piston surface 70, 72 - annular cavity 74, 76 - connecting element for the annular cavity 78, 80 - through hole 82 - connecting rod 84 - leash shoulder

A" is a connecting element for the piston surface

B' is a connecting element for an annular cavity

A1, A2, AZ, B - control connecting element

A is the reverse line

О - pressure sensor Ла Ла ий Ю.

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