JPS622008A - Valve gear for controlling stroke of consuming machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The invention relates to a valve arrangement, in particular for controlling (positioning) the stroke of a consumer, such as a piston-cylinder unit. It relates to an S type having a piston and provided with a pressure regulating valve capable of loading a pressure medium onto the cylinder piston.

OBJECTS OF THE INVENTION The object of the invention is to improve a valve arrangement of the type mentioned at the outset and to provide for a consumer a complete stroke control means directly associated with the regulation of the pressure regulating valve. It is.

Means for Solving the Problems The present invention solves the above-mentioned problems in that a pressure spring is disposed between the cylinder piston and one end of the valve piston, and the pressure spring causes the valve piston to move toward the pressure regulating valve. It is possible to load in the closing direction.

Embodiment It is advantageous if a support ring is arranged for the transmission of forces between the valve piston and the pressure spring.

It is advantageous if the valve piston is controlled by a proportional magnet.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a valve arrangement 10 having a pressure regulating valve 12. In FIG. The pressure regulating valve 12 is controlled by a proportional magnet 14. The pressure regulating valve 12 also has a supply connection 16 , a return readout 18 and a consumption connection 20 .

For example, air is used as the pressure medium.

The pressure regulating valve 12il'i is integrated into a piston-cylinder unit consisting of a cylinder 22 and a cylinder piston 24 movable axially within the cylinder 22, which 24 is fixedly connected to a piston rod 26. The piston rod 26 is some kind of device (not shown)
It extends outwardly through the casing of the cylinder 22 for actuation.

The pressure regulating valve 12 can be fixed to the cylinder 22 in its own way, but it can also advantageously be integrated directly into the cylinder 22, as shown in FIG.

The consumer 20 of the pressure-regulating valve 12 communicates via a conduit 28 with a compartment 30 in the cylinder 22 in order to load the lower end face of the cylinder piston 24, viewed in FIG. 1, with a pressure medium. , pressure medium can be supplied from the consumption connection 20 of the pressure regulating valve 12 via the conduit 28 to the compartment 30 .

A piston rod 26f and a surrounding push spring 32 are disposed between the caging of the cylinder 20 and the upper end surface of the piston 22 as seen in FIG. Pushing to the indicated 0 position or basic position.

The other push spring 34 actually surrounds the first push spring 32 concentrically in the illustrated embodiment, but this need not necessarily be the case; Upper end face and cylinder 22 as seen in Figure 1
It is incorporated between.

As already mentioned, one end of the pressure spring 34 is supported in the cylinder piston 24, while the other end of the pressure spring 34 is supported in the annular groove 14. Annular groove 74
is formed within the cylinder 22 and in the illustrated embodiment is arranged concentrically with respect to the central axis 76 of the piston-cylinder unit.

Within the annular groove 74 there is a support ring 36 for more evenly transmitting the force between the bottom of the groove and the push spring 34.

As shown in FIG.
It is interrupted in the area of the pressure regulating valve 12 so that it can be loaded in the axial direction by means of FIG.

In this case, the end piece 58 rests on the support ring 36 either directly or via a cap 60.

The pressure regulating valve 12, shown in cross-section in FIG. 2, is installed in the bore 78 of the cylinder 22 in the illustrated embodiment.

The bore 78 actually extends parallel to the central axis 76 of the cylinder 22 and extends into the annular groove 74 as shown in FIG. As a result, the bore 78 is in direct communication with the annular groove 74 and, therefore, in the area of the bore 78 the bore 74 does not have a bottom, so that the pressure spring 34 can be connected to the end piece 58 via the support ring 36. cap 60
and can be loaded by the upper valve piston 52.

The pressure regulating valve 12 is a cylinder 22 in the illustrated embodiment.
It has a casing 38 which is one part of the.

Inside the casing 38, a guide bush 40 and a guide bush 42 are arranged in front and behind each other when viewed in the axial direction.

A valve sleeve 44 is guided in the guide bush 40 in the axial direction. A disk-shaped valve body 46 is screwed into the threaded shaft-like end of the valve sleeve 44, which is lower in FIG.

The dish-shaped valve body 46 is attached to the valve seat 4 formed on the guide bush 40.
We are collaborating with 8. The disk-shaped valve body 46 is permanently pushed toward the valve seat 48 in the closing direction by a pressure spring 50 arranged between the disk-shaped valve body 46 and the inner bushing 42 .

The valve piston 52 is axially loaded by an armature 54 of the proportional magnet 14 (instead of the proportional magnet, other devices for loading and adjusting the valve piston 52 can also be provided).

The valve piston 52 is attached to a valve seat 6 formed in the valve sleeve 44.
It has a dish-shaped valve body 64 cooperating with 6.

Additionally, valve piston 52 has a longitudinally extending shaft 56 of relatively small diameter. The shaft 56 extends through a recess 62 formed within the valve sleeve 44. An annular chamber is formed between the shaft 56 and the inner wall of the hole 62. As further detailed 1c, the pressure medium flows through this annular chamber to the outlet or return connection 18.

An end piece 58 connected to the shaft 56 is also part of the valve piston 52, has a larger diameter than the shaft 56, and is guided in the guide bush 42 in the axial direction.

The end piece 58 can abut the support ring 36 directly. However, in the illustrated embodiment, the cap 60 fitted onto the end piece 58 itself abuts the support ring 36.

Between the shaft 80 of the valve sleeve 44 and the inner wall of the id bush 40 there is an annular chamber 6 which communicates with the supply connection 16.
8 is formed.

A packing 70 is arranged between the guide bushing 40 and the valve sleeve 44, and a packing 72 is arranged between the guide bushing 42 and the end piece 58 of the valve piston 52.

The device according to the invention operates as follows.

The cylinder piston 24 of the piston-cylinder unit is in the basic position as shown in FIG.

The cylinder 22 or compartment 30 is connected to the conduit 28 and the consumer 2
It is vented to the outlet or return connection 18 via the hole 62 and the open valve seat 66. The valve seat 48 is closed by a dish-shaped valve body 46 and thus the supply connection 1
6 is cut off.

Now, when the ratio magnet 14 is energized, an axial force is applied to the valve piston 52 via its armature 54 . (
(See FIG. 2) The valve piston 52 is moved axially downwards, first of all the valve seat 66 being closed, thereby disconnecting the return connection 18. The valve piston 52 is the valve seat 66
As soon as it rests on the valve sleeve 44, a further axial movement is carried out and the valve sleeve 44 is likewise moved axially downwards.

As a result, the dish-shaped valve body 46 is lifted from the valve seat 48, and the valve seat 48 is opened. In this state, pressure medium flows from the supply connection 16 to the annular chamber 68 □Opened valve seat 4
8 to the consumption-like connection 20 from which it flows through the conduit 28 to the compartment 30 of the cylinder 22.

By moving the valve piston 52 in the axial direction,
The support ring 36 is loaded via the end piece 58 of the valve piston 52 and the cap 60, causing the valve piston 52 to move in the axial direction. The support ring 36 is lifted up against this.

Depending on the pressure medium in the compartment 30, the Schilling piston 2
4 is loaded, and the cylinder piston 24
is moved upward (see FIG. 1) against the force of push springs 32, 34. This causes the push spring 34 (and the push spring 32) to contract. In this state, the pressure spring 34 forming the control spring exerts a force on the support ring 36 that is proportional to the stroke distance of the cylinder piston 24 . This force is transmitted via the cap 60 to the valve piston 52 (end piece 58), which in turn is transmitted to the armature 54 of the proportional magnet 14.

When the force from the push spring 34 transmitted to the armature 54 overcomes the force of the proportional magnet 14, the valve piston 52 is pushed slightly upwards (see FIG. 2). The valve sleeve 44 moves following this movement. That is the dish-shaped valve body 4
6 is loaded by the push spring 50 in the closing direction of the valve seat 48. In this case, the open cross-sectional area of the valve seat 48 is reduced, so that less pressure medium can be replenished from the supply connection 16.

The upward movement of the valve piston 52 is caused by the force exerted on the valve piston 52 by the pressure spring 34 as an adjustment spring and by the proportional magnet 14.
This continues until the force balance between the force applied to the valve piston 52 and the force applied to the valve piston 52 is adjusted.

When the proportional magnet 14 is relatively strongly excited, the proportional magnet 14. The forces exerted on the valve piston 52 by the valve piston 52 are overcome, the valve seat 42 is opened even wider and the flow cross-section for the pressure medium entering from the supply connection 16 is thus enlarged.

As a result, the force on the cylinder piston 24 is likewise increased.

Due to this action, the stroke of the cylinder piston 24 becomes relatively large (and thus the contraction of the pressure spring 34 and the force exerted by the pressure spring 43 on the valve piston 52 are also large. This entire process is proportional to the pressure spring 34). This process is repeated until the force balance between the force applied by the magnet 14 and the force exerted by the magnet 14 is adjusted.

Thereby, the stroke of the cylinder piston 24 is directly proportional to the adjustment or excitation of the proportional magnet 14.

Furthermore, a force balance between the push spring and the proportional magnet takes place.

In practice, adjustment is performed regardless of pressure fluctuations in the pressure medium.
This is also done regardless of the coefficient of friction.

In the embodiment described with reference to the drawings, the proportional magnet 14 exerts a repulsive force on the valve piston 52. However, the invention is equally applicable in the opposite working format. That is, the present invention can also be applied to the case where the proportional magnet attracts the valve piston with less force.

[Brief explanation of the drawing]

FIG. 1 shows a pressure regulating valve and a piston according to an embodiment of the present invention.
FIG. 2 is a partially cross-sectional view of a valve device having a cylinder unit, and FIG. 2 is a cross-sectional view of the pressure regulating valve shown in FIG. 10... Valve device, 12... Pressure regulating valve, 14...
Proportional magnet, 16... Supply connection, 18... Return connection, 20... Consumption connection, 22... Cylinder, 24
...Cylinder piston, 26...Piston rod,
28... Conduit, 30... Compartment, 32, 34... Pressing spring, 36... Support ring, 38... Casing, 40° 42-... Guide bush, 44... Valve Sleeve, 46... dish-shaped valve body, 48... valve seat, 5o...
・Press spring, 52... Valve piston, 54... Mover, 56... Shaft, 58... End piece (-i
), 60... Cap, 62... Hole, 64... Dish-shaped valve body, 66... Valve seat, 68... Annular chamber, 70,7
2... Packing, 74... Annular groove, 76... Center axis line, 78-9. Hole, 80...Shaft, 82...
·End face. FIG, 2 Procedural amendment (method) % formula % 1, Indication of case Patent application No. 48752 of 1985 2,
Title of the invention: Valve device for controlling the stroke of a consuming machine 36 Relationship to the case of the person amending the valve device 36 Patent applicant name: Hellionwerke Kommanditogesellschaft 4, agent May 2γ, 1985 (Date of dispatch) 6, Subject of amendment (1) Column 3□ of the representative of the patent applicant in the application. z) (3) #cS. ,. , 9 □, (2) Power of attorney (3) Drawing 7, contents of amendment

Claims (1)

[Claims] 1. A valve device for controlling the stroke of a consuming machine, which includes a pressure regulating valve having an adjustable valve piston in a given type and capable of loading a pressure medium onto a cylinder piston. In the version provided, a pressure spring (
34) is arranged, and the valve piston (52) can be loaded by means of the pressure spring (34) in the closing direction of the pressure regulating valve. . 2. Valve device according to claim 1, wherein a support ring (36) is arranged for transmitting force between the valve piston (52) and the pressure spring (34). 3. Valve device according to claim 1 or 2, wherein the valve piston (52) is controllable by a proportional magnet. 4. Valve arrangement according to claim 2, wherein the support ring (36) is asymmetrically loaded by the valve piston (52).