DE2312866A1 - CONTROL DEVICE FOR AT LEAST TWO HYDRAULIC CONSUMERS SUPPLIED BY A PRESSURE MEDIUM SOURCE - Google Patents

Description

KHD

KLöcKNER-HUMBOLOT-DEUTZag · Cologne 5 Cologne 80 on February 26, 1973

Our reference: D 73/19 AP Ja / B

Control device

for at least two hydraulic ones fed by a pressure medium source consumer

The invention relates to a control device for at least two hydraulic consumers fed by a pressure medium source with one each with regard to a certain type of circuit in connection with the housing section surrounding it trained control slide of a block valve for each consumer, each control slide at least one associated with it Consumers leading working line shut off in a central position, in two working positions each with a pressure medium source or a return connects and influences a control line that is one of the direct return lines of the Pressure medium source coming pressure medium flow serving changeover valve assigned.

A control device of the type mentioned above has become known (DT AS 1 090 480), in which the control slide has a separate line from the pressure medium supply line leading to the return, in the middle position of all control spools of the block valves to the return, master the open control channel, the one with the control line of the switching valve is connected. Disadvantageous with this one known solution is that the control channel for the control line of the switching valve extends through all block valves. This has the further major disadvantage that it

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especially when combining block valves with different ones Switching types, for example when combining block valves with positive overlap of the control spool for Control of the switchover valve is absolutely necessary, apart from the control channel that is separate from the pressure medium inlet channel, an additional one To provide switching valve and an additional control channel, which also extends through all block valves and which is closed when the associated control slide is actuated. This setup yields for that way Extended control device, in turn, has the disadvantage that when using several switching valves, block valves inevitably also must be used that have at least one additional control channel that can be closed by the control slide. This results in block valves manufactured in large quantities that, with the same size dimensions, are only used to control low pressure medium flows are used, the further disadvantage, that their production is unnecessarily burdened by the production costs for the additional control channel.

In addition, a control device has the expanded Construction has the disadvantage that when they are used in a wide range of applications, in addition to the high manufacturing costs result in very high provision costs and the resulting high storage costs, which disadvantageously creates the possibility confusing block valves with an additional control channel for block valves with a simple control channel given is.

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On the basis of these findings, the object of the invention is to be found based on improving a control device of the type presupposed at the beginning with structurally simple means to that effect and to expand the fact that they can subsequently increase the flow rates in existing hydraulic systems and not existing switchover valve allows the subsequent cultivation of such a valve without significant intervention at low production costs. In particular, the possibility should be given of the control device with only one basic set of block valves to be able to use both with and without changeover valve, whereby again all occurring switching types with built-on changeover valve should be feasible.

According to the invention, this object is essentially achieved by that two control slides each one with these in the opening direction for the working line or the working lines in operative connection standing and parallel to each other connected to the control line of the switching valve auxiliary control member is assigned. By means of such a structure it is at low production costs possible, a control system of the type required both in hydraulic systems with small and large flow rates to be used in series blocking circuits, circuits with current sharing and also in total blocking circuits. In particular the control device according to the invention offers the advantage that it provides fine control within the so-called dead travel of the control slide the block valves enables.

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In the event that, in a control device, the shut-off element of the switching valve is hydraulically closed and by spring force is opened, it is provided in a further development of the invention that the auxiliary control member as a discharge valve with a transverse to Closing surface arranged in the longitudinal center axis of the control slide is executed and that this associated closing body directly or indirectly through a slope of the control slide in the Opening sense is actuated.

In the case of a control device, the control slides are automatic by means of a return spring arranged in a front cover in its neutral position can be returned from a working position, so there is one in the manufacturing costs in particular favorable design in that the return spring receiving cover serves as a valve housing for the auxiliary control member. Included a further double utilization of components is achieved in that the cover receiving the return spring of the control slide serves as a return channel for the pressure medium flowing out via the auxiliary control element.

Further features and advantages of the present invention can be taken from the following description of the drawing, which shows an embodiment of the invention. 1 shows the block diagram of the control device according to the invention, FIG. 2 shows the control slide of a further example of a control device in longitudinal section,

Fig. 3 shows a cross section through a block valve in the control device according to the invention, also with Pictured in section outlet valve.

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The control device shown in Fig. 1 consists of a switching valve 1, to these block valves 2 to 4 connected in series and one to these in parallel to the switching valve 1 connected block valve 5. The switching valve 1 is connected via a line 6 to a pressure medium pump 7, which via a suction line 8 is connected to a storage container 9. The line 6 is also via a line 10 with a second input of the block valve 4 in connection, which is used for the control a consumer Vl, not shown, is used, which serves as a pressure medium inlet and outlet line at the same time Line 11 is connected to the block valve 4.

The block valve 3 is intended to control a consumption V2, which is designed, for example, as a double-acting hydraulic cylinder, the working spaces of which are supplied and used as pressure medium -Discharge lines serving lines 12 or 13 with the block valve- » til 3 related. The block valves 3, 4 are connected to one another via a channel 14 which is in the neutral position shown of the block valve 4 is in communication with the line 10.

The block valve 2 is like the block valve 4 with an example consumer V3, designed as a unilateral lifting cylinder, is connected via a line 15. The block valve is 3 Connected via a channel 16 to the block valve 2, the control slide of which in the neutral position connects channel 14 to channel 16 connects. The block valve 2 continues to connect the channel 16

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in the illustrated neutral position with a line branch 17, which is connected to the pressure medium branch 18 of the switching valve 1. On the pressure medium branch 18 is still as input and circuit breaker executed block valve 5 connected, which in the illustrated neutral position, the pressure medium branch 18 with a line 19 connects which is connected via a parallel branch 20 to the drainage channel 21 of the control device, which in turn is connected to the storage container 9 via a filter 22. The block valve 5 is also an example Hydraulic consumer designed as a hydraulic motor 23 is connected via a line 24, which is also connected to the line communicates.

The outflow channel 21 of the control device is connected to the control line 26 of the switching valve 1 via a throttle, whose piston slide constantly connects it to the line 6 via a throttle (not shown). On the control line facing away from the end face is the piston slide of the switching valve 1 in the switch-off sense of a spring 27 in addition to the pressure of the work equipment constantly acting on this area. On the discharge channel 21 is the discharge channel 28 of the block valve 2, the drainage channel 29 of the block valve 3 and the drainage channel 20 of the control block 4 are connected.

According to the invention, the control line 26 is an auxiliary control element or 32 or 33, which are designed as the same discharge valves are. The discharge valve 33 is above one of the opening

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its closing body 34 serving tappet 35 with the slope 36 of the control slide 37 of the block valve 4 in such an operative connection, that when moving the control slide 37 in the direction of connecting the line 10 to the line 11 before or shortly before the opening of the control edges for the latter line, the discharge valve 33 opens and that approximately parallel to this, the switching valve 1 as a result of the relief of the control line 25, the line 6 with the pressure medium branch 18 connects. This is more advantageous Way allows the consumer Vl first via the control slide 37 of the block valve 4 to be supplied in small quantities with a fine control and after the pressure medium branch has been fully opened 18 to supply pressure medium to the consumer Vl with increased performance. The one used to control switch 1, Working medium flowing through the control line 26 and the discharge channel 30 is thereby transferred from the discharge valve 34 into a Abstxörasweig 38 passed to which the two-sided leakage oil channels 39 and 40 of the block valve 4 are connected via a line branch 41 are.

The discharge valve 32 assigned to the control block 3 is different from the discharge valve 33 to the control slide 42 of the valve block 3 in both directions of movement with a slope 43 or 44 in operative connection, so that before the full opening of the control edges for the lines 12 and 13 via the line 10 and the Line branch 14 can be supplied to the consumer V2 in a small amount of pressure medium with a fine control, wherein after opening has taken place of the switch 1 with the feed with increased hydraulic

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Ldstung takes place via the pressure medium branch 18. The drain valve 32 is also connected via a channel 45 to the outflow branch 38, which is connected to the two via a line branch 46 Leak oil channels 47 and 43 of the block valve 3 is in connection. Like the block valve 3, the block valve 2 only has one side with the associated Abstrßmventil 31 in operative connection Control slide 49 with a slope 50. The slope 50 acts after moving the control slide 49 to the left in the sense of the connection of the channel 16 with the line 15 on the plunger 35 of the discharge valve 31. This can be done in the same way as for the preceding Control blocks 3 and 4 described a fine-tuning of the work equipment to the consumer V3 and done after Fine control this over the line branch 17 are supplied in an increased amount of pressure medium. The drain valve 31 is also connected via a branch 51 to the outflow branch, which in turn is connected to the branch via a branch 52 left LecJcölJenal 53 or the right leakage oil channel 54 of the block valve 2 communicates.

In the embodiment shown in Fig. 2 is different of the exemplary embodiment described in FIG. 1, the block valve 5 and the consumer 23 is not connected to the control device. With regard to its basic structure, the Control device according to FIG. 2 is the same as that in FIG. In contrast to the example described in FIG. 1, the valves 31 to 33 are also designed as discharge valves Auxiliary control organs as additional, on the inclusion

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a return spring 55 serving cover 56 carried out attachable components. After the solution shown in Fig. 3 is used The cover 56 serving to accommodate the return spring 55 also acts as a valve housing for the closing body 34 of the auxiliary control organs to 33. The end of the cover 53 is provided with a line connection 57 which connects to the storage container via a line 58 9 is in connection, while another line connection 59 located in front of the closing body is connected to the control line 26 is connected.

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Claims (4)

5 Cologne, February 26, 1973 Our reference: D 73/19 AP Ja / B Claims l. \ control device for at least two of one pressure control source fed hydraulic consumers with one each in connection with a particular type of circuit with the housing section surrounding it formed control slide of a block valve for each consumer, each Control slide blocks at least one working line leading to the associated consumer in a central position, in two Working positions each connects to the pressure medium source or a return and influences a control line, which one assigned to the direct return line of the pressure medium flow coming from the pressure medium source serving changeover valve is, characterized in that the two control slides (37, esp. 49) each have one in operative connection with them in the opening direction for the working line (11 or 15) or the working lines (12, 13) standing auxiliary control element connected parallel to one another to the control line (26) of the switching valve Λ1) (31 or 32 or 33) is assigned. 409838/0144 - 11 - February 26, 1973 2. Control device according to claim 1, in which the shut-off element of the UmschaltvnetiIs is hydraulically closed and opened by spring force, characterized in that the auxiliary control element as a discharge valve (31 or 32 or 33) with a transverse to the longitudinal center axis of the control slide (37 or 42 or 49) arranged closing surface and that the closing body (34) associated therewith can be actuated in the opening direction directly or indirectly by a slope (36 or 43, 44 or 50) of the control slide (37 or 42 or 49). 3. Control device according to claim 2, in which the control slide is arranged by means of a cover in an end face Return spring automatically into its neutral position from a Working position can be returned, characterized in that the return spring (55) receiving cover (56) serves as a valve housing for the auxiliary control member (31 to 33). 4. Control device according to claim 3, characterized in that the return spring (31 to 33) of the control slide (37 or 42 or 4f) receiving cover (56) as a return channel for the pressure medium flowing off via the auxiliary control element (31 to 33) serves. A09838 / 0U4 / λ Blank page