DE1775027B1 - HYDRAULICALLY CONTROLLED SPOOL VALVE - Google Patents

Description

1 2

The invention relates to a hydraulically controlled bucket in, for example, a hoisting machine on a

Lift valve with a housing with at least one longitudinally higher position. Simultaneously with the

bore, with an inlet and an outlet chamber, actuation of the boom valve, the excavator bucket

which adjusts the longitudinal bore at a distance from each other valve so that it is with the boom valve cut, with a channel connected in series between sides 5. The lifting and unloading

the housing begins and transversely to and in the process essentially happen as a result

stood at the same time from the longitudinal bore to the outlet side. There is a

stretches, with a first and a second working pressure less than that for turning it back

chamber that required the longitudinal bore on both sides of the because of the weight of the bucket and Cut the inlet and outlet chambers, with one the io of its charge the movement necessary for the unloading.

Supports longitudinal bore between the first working chamber supply. After emptying the excavator

and the branch chamber intersecting the inlet chamber, the operator brings the device into the spoon

which is connected to the channel, back with at least one starting position and the one described

Drain chamber, which is the longitudinal bore in addition to the two-work cycle, starts again. Ordinarily would th working chamber cuts, and with a piston 15 to carry out this work sequence a compli-

slide, which has three grooves on the outer circumference as well as an adorned hydraulically controlled valve and a

a first and a second hollow part and with a pleated arrangement of pipes may be required,

the two hollow parts at an axial distance around the described parallel and series connection

Has bound openings and can be made in the longitudinal bows.

tion of a neutral position in which the so The invention is based on the object of this

Inlet chamber to eliminate entering fluid through the longitudinal disadvantage and a hydraulically controlled

To create a bore over a circumferential groove of the piston valve tes valve, which is relatively easy

flows to the outlet chamber, in two working positions fan design a series-parallel circuit of the ^

is longitudinally displaceable. Fluid flow to or from multiple cylinders

In the case of devices with several hydraulic cylinders 25 or motors of one device,

or motors, there are different operating states, with a hydraulically controlled valve of the

in which it is desirable that this cylinder type described above will perform this task according to

or motors working in series or parallel to one another, the invention is solved in that the circumferential grooves,

th. In the case of series operation, more than one of the hollow parts and the openings can be arranged in this way.

Cylinders or motors work at the same time. What is different is that in both working positions the direct one

on the other hand, the cylinders or motors work during the connection through the longitudinal bore between the

Usually parallel operation one after the other. Is locked to the inlet and outlet chamber and in

For example, when operating in parallel, two valves can be in one working position over the first hollow part

a multiple valve assembly together actuates the spool and the first openings

and in this case the first cylinder 35 would be intake chamber with the branch chamber and the first

or motor operated until it reaches a mechanical working chamber and over the second hollow part of the

stroke reached, whereupon the pump a pressure on the piston valve and the second openings the second

builds that is high enough to connect the second cylinder working chamber to the drain chamber,

or to operate the motor. Such a multiple par while in the other working position on the

Allele valve assembly can be designed so that they 40 second hollow part of the piston valve and the

the cylinders or motors operated at the same time, for this purpose the second working chamber with the second openings

However, one would have to feed the fluid to an inlet chamber and through the first hollow part of the

Dosing or metering subject to what is a spool valve and the first openings the first

Would result in a reduction in the performance of the system. In the case of the working chamber with the branch chamber and the J

the in-line arrangement could indeed be the cylinder 45 is connected laßkammer.

or actuate motors at the same time, the problem with
it says, however, that large cylinders or motors are used. The invention will now be further elucidated with reference to the drawing during the actuation of more than one of the vents. In the drawings, tile shows not achieving the desired work outcome. 50 Fig. 1 shows a longitudinal section through a valve according to For various hydraulic devices of the invention with the piston valve in the new function, a combined in-line parallel-central position,

Control required, that is, in these devices F i g. 2 shows a section along the line H-II in

the series circuit Fig. 1 must be in an operating state,

and in another operating state the parallel 55 F i g. 3 shows a section along the line III-III in FIG

Circuit are applied. In a hydraulic Fig. 1.

see shovel excavator, for example, turning to FIG. 4, a longitudinal section according to FIG. 1, in which to turn back the excavator bucket and to adjust the piston valve in a working position of the boom to connect in parallel. Who finds

The pressure required for the excavator bucket is less than 60 F i g. 5 one of the F i g. 4 corresponding representation,

than the pressure required for the boom. The whereby the piston valve is in a second

The excavator bucket therefore rotates back until it is in a working position, and

mechanical stop reached; then the Fig. 6 rises a section through a multiple valve

Fluid pressure so that the boom moves upwardly in an assembly having a one-piece cast housing,

moves a position corresponding to half the stroke. 65 this figure showing the application of the valve according to FIG

Then you bring the shovel excavator to unload the invention explained.

place and the operator operates the boom The illustrated, generally designated 10,

valve to the boom for unloading the excavator- double-acting, hydraulic series-parallel valve

3 4

has an elongated housing 12, which are therefore separated from one another with screws. About the scope

Ben or bolts on other hydraulic valves arranged in a distributed manner first openings 53 open into

housing can be attached to, for example, the left end part of the hollow part 52 and over the

a desired multiple valve arrangement distributed around the circumference of the second openings 54

Fen, such as described in U.S. Patent 3,329,169 open into the central part of the hollow part 52.

ben is. Several open-

An opening 55 extends through the housing 12 to the right of the opening 54

Longitudinal bore 14, in which a double-acting KoI- the middle part of the hollow part 52 in connection

benschieber 16 is displaceable. Into a fork, while others distributed over the circumference

The inlet channel 17 with the longitudinal bore 14 has openings 56 cut in order to the right of the openings 55

The inlet chambers 18 and 19 enters under high with a wider portion of the hollow part 52 in

Pressurized fluid are from a connection not shown. One under spring pressure

th source via an inlet section, the pressure relief valve 57 is arranged in the hollow part 52

same not shown, but classified in specialist circles and divided into two sections, whereby the

is known. An outlet chamber 20 intersects the pressure relief valve 57 to the left of the openings 56.

Longitudinal bore 14 between the inlet chambers 18 The piston valve 16 has a left cylindrical

and 19. A branch chamber 22 intersects the longitudinal thrust part 60, a right cylindrical part 61

bore 14 next to the inlet chamber 19 and stands and a centrally arranged cylindrical part 62

via a channel 23 with a channel 24 in connection and is also arranged between the center

dung, which lies in a plane, the distance below the cylindrical part 62 and the right cylindrical part

a cylindrical part 63 is arranged halfway and essentially parallel to the plane of the threshing part 61.

Inlet and outlet chambers runs. According to either side of the centrally located cylindrical

Representation in FIG. 3 is an end 25 of the channel 24 Part 62 are circumferential grooves 64 and 65 formed

closed, while this channel 24 extends transversely to det, the groove 65 to the left of the cylindrical part

the side surfaces of the housing 12 is arranged to form an open 25 63. Another circumferential groove 66

End 26 extends out. Working openings 28 and 30 are arranged to the right of the cylindrical part 63. if

open on the outside of the housing 12 and the piston slide as shown in FIG

are in connection with working chambers 31 and 32- Fig. 1 is in its neutral position, flows

manure, which the longitudinal bore 14 on opposite fluid through the longitudinal bore 14 between the

the sides of the inlet chamber 18 and the branch chamber 30 inlet chambers 18 and 19, the outlet chamber 20

cut mer 22. Drain chambers 34 and 35 and branch chamber 22.

the longitudinal bore 14 on opposite When in operation the piston valve 16 is in Sides of the working chambers 31 and 32 and are in the neutral position shown in Fig. 1 befinmit the working chambers concerned via channels det, the working chambers 31 and 32 are locked and 36 and 37 in conjunction. Same pressure relief 35 that through the inlet chambers 18 and 19 into the valve 38 and 39 are in the channels 36 and 37 housing 12 entering pressurized fluid flows to the disengagement, laßkammer 20 and to the branch chamber 22, as well as

The piston valve 16 is shown in FIG. 1 in the neutral into the openings 53 of the piston valve 16

len position and can with known step to go through the hollow part 52 and the opening

teln, for example with suitable links that flow, for example, 40 gene 54 into the branch chamber 22,

on in Fig. 1 left end of spool 16 When the spool 16 turns right into the in

attack, is moved into one of two working positions. Fig. 4 is the position shown

be practiced. The piston valve 16 is connected in series by a fluid flow. The immediate

Helical spring 40 driven into its neutral position through the longitudinal bore 14 between the flow

ben, this coil spring 40 exerting a force on the inlet chambers 18 and 19 and the outlet chamber 45

exercises one of two collars 41 and 42, which is interrupted on mer 20. Likewise, the immediate

the piston valve 16 are arranged; the flow through the longitudinal bore 14 between

Direction of the force exerted by the spring 40 depends on the inlet chamber 19 and the branch chamber 22

on the position of the piston valve. interrupted. The fluid therefore flows through the

A cap 43 fastened to the housing 12 surrounds openings 46 in the hollow part 45 and presses it closes the spring 40, the collars 41 and 42 and the pressure relief valve 50 to the left, to then on the right End of the piston slide 16. The piston pressure valve 50 passes through the openings 48 into the Slide 16 has a hollow part 45 which extends from the working chamber 31 and from there through the opening left end part of the piston valve up to its 28 in a cylinder or the like. To flow. The rear center part extends. Several on the circumference distributed 55 stromfluidum from a cylinder passes through the opening arranged Openings 46 open at the right end opening 30 into the housing 12 and get into the into the hollow part 45, while another row of working chamber 32 and from there through the openings from openings 55 distributed over the circumference into the hollow part 52, from where it depends on the stalks 48 into the middle part of the hollow part 45, the other downstream valves the. A pressure relief valve 60 under spring pressure either through the openings 54 into the branch duct 50 is arranged in the hollow part 45 and divided 22 or through the openings 53 into the outlet chambers hollow part 45 in two sections with the mer 20 flowing. When the outlet chamber 20 is blocked If the pressure relief valve 50 is open or closed to the right of the middle, all of the fluid flows through the gen 48 lies. Branch chamber 22 and vice versa.

The piston valve 16 has a further hollow 65 When the piston valve 16 to the left into the in

Part 52 on, which extends from the right end of the piston F i g. 5 position shown is moved, is the

Slide connected in parallel to the middle part to the left of the fluid flow. The immediate

Middle of the same extends. The hollow parts 45 and 52 face fluid flow through the longitudinal bore 14

between the inlet chambers 18 and 19 is interrupted, as is the flow of fluid between the inlet chambers and the working chamber 31 is interrupted. The fluid therefore flows from the Inlet chamber 18 through openings 53 in the cavities Part 52 and presses the pressure relief valve 57 to the right in order to pass it through the openings 56 to the working chamber 32 and from there through the working opening 30 to a cylinder or the like. To flow. The fluid also flows from the inlet chamber 19 through the openings 54 into the hollow part 52 and from there through the openings 55 into the Branch chamber 22 to together with the flow through the working opening 30 downstream a To create parallel current from the housing 12 out. The return flow from the cylinder enters the Working opening 28 and into the working chamber 31 and opens the valve 50 to then pass through the openings 48 to pass into the drain chamber 34 and out of the housing 12 into a container. ao

It is obvious that the illustrative application example shown in the introduction to the description a series-parallel fluid flow when using the one described here, constructively a relatively simple valve can be realized.

The series-parallel valve according to the invention has been described here in an embodiment, which enables the valve to be combined with other conventional valves to form multiple valves. In Fig. 6, the valve 10 described above is formed as part of a group of valves, which are combined in a single cast housing 70. According to the illustration in FIG. 6, this is Series-parallel valve 72 with a valve 74 with a floating piston slide and with a double-acting valve Valve 76, which is of the type described in U.S. Patent 3,329,169. the The construction and operation of the valves 72, 74 and 76 has already been described in detail, so that a new detailed description is superfluous here. Briefly summarized, the valve group according to Figure 6 shows an inlet section 78 and an outlet section 80 and drain chambers 82 and 84. The series parallel valve 72 has a branch chamber 86 which corresponds to the branch chamber 22 of the embodiment described above and with a branch channel 88 is in communication, which is shown in Fig. 6 in dashed lines. Of the Branch passage 88 is open to downstream fluid flow to valves 74 and 76, when the piston slide of these valves are arranged in their longitudinal bores accordingly. Numerous other applications of the in-line parallel valve according to the invention will be apparent to those skilled in the art On the hand.

Claims (4)

Claims: 60 1. Hydraulically controlled valve having a housing with at least one longitudinal bore, with an inlet and an outlet chamber which intersect the longitudinal bore at a distance from one another, with a channel which begins between the sides of the housing and extends transversely to and at a distance from the longitudinal bore extends to the outlet side, with a first and a second working chamber which intersect the longitudinal bore on both sides of the inlet and outlet chamber, with a branch chamber which intersects the longitudinal bore between the first working chamber and the inlet chamber and is connected to the channel, with at least one discharge chamber , which intersects the longitudinal bore next to the second working chamber, and with a piston slide, which has three grooves on the outer circumference as well as a first and a second hollow part and openings connected to the two hollow parts at an axial distance and in the longitudinal bore from a neutral position in the fluid entering the inlet chamber through the L longitudinal bore flows through a circumferential groove of the piston slide to the outlet chamber, is longitudinally displaceable in two working positions, characterized in that the circumferential grooves, the hollow parts and the openings are arranged in such a way that in both working positions the direct connection through the longitudinal bore (14) between the inlet ( 18, 19) and laßkammer the initial M (20) is locked and in one ™ operating position through the first hollow portion (52) of the piston slide (16) and the first openings (53, 54, 55, 56) the inlet chamber ( 18, 19) with the branch chamber (22) and the first working chamber (32) and via the second hollow part (45) of the piston valve and the second openings (46, 48) the second working chamber (31) is connected to the discharge chamber (34) is, while in the other working position over the second hollow part (45) of the piston valve and the second openings (46, 48) the second working chamber (31) with the inlet chamber (18) and over the first hollow part (52) of the piston slide and the first openings (53, 54, 55, 56) the first working chamber (32) is connected to the branch chamber (22) and the outlet chamber (20). _ 2. Valve according to claim 1, characterized in that the first hollow member (52) extends substantially through the with grooves (64, 65, 66) provided part of the piston slide (16) in the direction \ tung the first working chamber (32) extends. 3. Valve according to claim 1 or 2, characterized in that in the first hollow part (52) of the piston slide opening openings (53, 54, 55, 56) distributed over the circumference arranged first, second, third and fourth openings exist that the hollow in the second Part (45) of the piston slide opening openings (46, 48) distributed over the circumference arranged fifth and sixth openings exist that in the one working position (F i g. 5) located piston valve, the second working chamber (31) and the one adjacent to it Drain chamber (34) through the fifth and sixth openings (46, 48) are connected, wherein the branch chamber (22) is in communication with the third openings (55) and via the first, second and third openings (53, 54, 55) connected to the inlet chamber (18, 19) while the inlet chamber with the first working chamber (32) through the first, second and fourth openings (53, 54, 56) is connected, and that in the other working position (Fig. 4) located piston valve the first working chamber (32) with the branch chamber (22) via the third and second openings (55. 54) and the first working chamber (32) with the outlet chamber (20) via the third and first openings (55, 53) are connected. 4. Valve according to claim 3. characterized through a first and second pressure-responsive check valve (57, 50) in the first and second hollow part (52. 45) of the piston valve (16), the first check valve being the fourth openings (56) and the second check valve closes the sixth openings (48). 1 sheet of drawings 109 517/209