DE2119168B1 - Remote control device for a volume-regulated control slide device - Google Patents

Description

The invention relates to a remote control device for a quantity-regulated control slide device, which is used for quantity-regulated control the inflow and outflow of a hydraulic medium into one or more hydraulic media Consumer lines or from these serves and a hydraulic pressure compensator and has at least one three-position control valve, which is of slide design with a pressure pump connection, Is formed return connection and one or two consumer connections and its control edges located between the pump connection and the respective consumer connection form a control orifice, the pressure gradient of which from the pressure compensator to one of each applied absolute pressure independent constant Setpoint regulated is and each with a hydraulic actuating cylinder for the slide of the each three-position control valve is provided with a remote control part, in which each control chamber of an actuating cylinder has one as a pressure reducer designed 3/2-way control pressure regulating valve in slide design is assigned, its output via a first hydraulic Ferusteuerleitung to a control chamber of the associated actuating cylinder, whose return connection has a second hydraulic remote control line to the pump return of the hydraulic pressure pump the control slide device and its input via a third hydraulic remote control line at least temporarily to the pump connection serving as the pressure fluid source the pressure compensator of the control spool device is connected.

The control pressure regulating valves of the remote control part are so at such a remote control device by the one on the pressure compensator of the spool valve device each pressure gradient applied is self-controlled, so that an independent servohydraulic system is dispensable. So far, this pressure gradient has been applied directly to the entrance of the applied to the respective control pressure regulating valve. So far, this has also been the case for the operational case high input pressures applied are regarded as harmless, as this acts as a servo control pressure serving output pressure of the control pressure regulating valve regardless of its input pressure is and only depends on the actuation stroke of the control slide of the respective control pressure regulating valve depends on the increasing pressure reducing spring force, with which the control spool of the control pressure regulating valve is each under his an output-side servo pressure acting on a face is balanced so that only one such servo pressure from the input of the control pressure regulating valve to its output which is in equilibrium with the pressure reducing spring. For the pressure reducing function of the control slide of the control pressure regulating valve is free play of the control slide required against its actuating means against the force of the pressure reducing spring.

The invention is based on the problem of functional reliability of such a self-controlled via the pressure compensator of the control slide device and a control pressure regulating valve provided with a control slide piston serving as a pressure reducing piston to improve and in particular the risk of jamming of the control slide to prevent the existing inlet pressure in order to free play of the pressure-reducing Control spool under all operating conditions.

To solve this problem it is provided according to the invention that all remote hydraulic control lines are low pressure lines and the third Remote control line connected to its source of pressure fluid via a pressure reducing valve is. In the above sense, low pressure means pressures of up to 20 atmospheres.

It is initially surprising with the pressure reducing valve after the To arrange control pressure regulating valve two pressure reducers one behind the other. The invention however, first ensures that at the input of the respective control pressure regulating valve an oversized inlet pressure can no longer be present, which prevents the free play of the as Pressure reducing piston acting control spool of the control pressure regulating valve by jamming the control spool. In practice, a Pressure reduction to around 20 atü is planned. even if the respective one leading to the input of the respective control pressure regulating valve third remote control line not to be designed as a high-pressure line, as usual needs, but just like all other remote control lines a low pressure line can be. This even gives the opportunity to develop the invention as usual in the case of pneumatic remote controls, this also applies to the hydraulic remote control at hand to form all hydraulic remote control lines from flexible hose lines.

Then the remote control part can even according to a preferred embodiment be designed as a switch console portable by an operator, which is preferably Is designed like a belly-shop and provided with a neck strap. All remote control lines are then advantageously combined in a multi-core flexible cable collection hose, which connects the remote control part with the control slide device.

The self-control of the respective control pressure regulating valve can, such as it is already provided in known self-controls, sometimes instead of the pressure compensator removed from a filled control chamber of a working cylinder will. In this case, a single pressure reducing valve provided according to the invention can be used on a parallel connection of the first pressure fluid source formed by the pressure compensator, the second source of pressure fluid formed by the filled control chamber and Connect any other other hydraulic fluid sources, the optional Via the pressure reducing valve according to the invention to the input of the respective control pressure regulating valve can be created. By suitable check valve arrangements according to the claims 4 and 5 you can ensure that only the from the respectively connected pressure fluid source to the pressure reducing valve according to the invention leading pressure line from the pressure fluid of the respectively connected pressure fluid source is applied.

It is known (see for example the German utility model 1 968 337 of the applicant), in the case of the control slide device the pressure compensator, the respective Three position control valve and a final hydraulic line plate as Clamp building units together in a sandwich-like manner to form a block. In this case it is preferably the pressure reducing valve according to the invention installed in the line plate, which then expediently with hose connections for the second and third remote control line is provided. In this arrangement, the inlet of the pressure reducing valve is advantageously to a hydraulic fluid inlet channel running through the structural units of the block connected. The same training can optionally be used for the return duct be provided; however, since this is pressureless, the compressive strength of the blocks is reduced not required for him, so that a separate return line can also be useful can to save mass of the blocks and to simplify their production.

The invention is illustrated below with reference to schematic drawings explained in more detail using exemplary embodiments.

1 shows a basic arrangement of a remote control device according to the invention, in which the pressure reducing valve according to the invention constantly to the Pressure compensator is connected, F i g. 2 shows a modified embodiment of the arrangement according to FIG. 1, in which the pressure reducing valve according to the invention temporarily to the Pressure compensator and is temporarily connected to the control chamber of lifting cylinders, Fig. 3 shows a vertical cross section through a transverse plane of a line plate with built-in pressure reducing valve provided according to the invention and FIG the invention possible belly-type remote control part.

Both in the remote control device according to FIG. 1 and in the remote control device according to FIG. 2 is a volume-controlled spool valve device 11 is provided, which is composed of several valve blocks, as indicated by the dash-dotted lines 10 is indicated. It is always on the first one Block 12, which contains a pressure compensator 14 and a pressure relief valve 16, a Row of similar valve blocks 18 a and 18 b blocked, to the one on the block 12 facing away from a final line plate 20a or 20b is blocked. As can be seen from the circuit diagram, which can be understood without further explanation is, contain the blocks 18 a 4/3 three-position control valves 22 a in slide design, those on the two control chambers 24 and 26 each of a double-acting working cylinder 28 with their two output lines A and B are connected. The blocks 18 b instead contain 3/3 three-position control valves 22 b, whose only output line C each to the single control chamber 30 of a single-acting lifting cylinder 32 are connected, the resetting of which takes place under the load of the lifted load. The control slide device is fed by a hydraulic fluid pump 34, which is connected by a line 36 to a pressure channel 38 in block 12 and from there via a line 40 to the pump inlet 42 of the pressure compensator 14 as well branches into a hydraulic fluid inlet channel 44 which runs through the remaining blocks. The inputs P of the three-position control valves are connected in parallel to these 22 a or 22 b via a blocking in the direction of the hydraulic fluid inlet channel 44 Check valve 46 connected. The return connections R of the three-position control valves 22 a and 22 b are also parallel to each other on the blocks that also run through Return channel 48 connected, from the block 12 in a drain line 50 to Pump sump 52 leads. The three-position control valves are operated via double-acting actuating cylinder 54 with the two control chambers 56 and 58. Zur Springs 60 are used for resetting.

The lines and channels acted upon by the working fluid are in fig. 1 and 2 drawn in solid lines, while those with the volume control contiguous auxiliary channels are shown in dashed lines. There are also chokes 62 and free connection points 64 are drawn in variously, but not here will be discussed further in detail and their function for itself from the Circuit diagram is understandable.

It is essential, however, that the between the pump connection P and the respective Consumer connection A, B or C lying control edges of the respective three-position control valve 22 a or 22 b form a regulating orifice, the pressure gradient of which from the pressure compensator on a constant setpoint that is independent of the absolute pressure applied will. For this purpose, the slide of each three-position control valve has one in the middle position open and otherwise closed first auxiliary control channel 66, one of its two auxiliary control connections assigned in the valve housing Connection 68 via a series-connected in the various blocks 12 and 18 a or 18 b first control channel 70 with the control chamber 72 of the pressure compensator 14 and the other connection 74 also via the first control channel 70 connected in series with the return channel 48 is connected. In addition, each three-position control valve 22 a is in the slide or 22b a second auxiliary control channel 76 is provided, one of which is an auxiliary control connection 78 via a throttle 62 to an auxiliary control branch 80 of the respective consumer connection A, B or C is connected and its other auxiliary control connection 82, respectively The blocks 12 are likewise connected via second control channels 84 in parallel with one and 18 a or 18 b continuous common control channel 86 are connected, which is also connected to the control chamber 72 of the pressure compensator via an auxiliary bore 88 in the Block 12 is connected. The auxiliary control junction 80 is a certain distance after the start of the control slide movement via the second auxiliary control channel 76 already before opening the consumer port A, B or C with the control chamber of the pressure compensator tied together. If consumer connections A, B or C are not connected, the Pressure fluid of the pressure pump 34 under the bias of the adjusting spring 90 of the Pressure compensator 14 via line 92 and drain line 50 to, so that then at the pump inlet 42 of the pressure compensator, only the pressure gradient determined by the spring 90 is applied. When the consumer connection A, B or C is open, the pump input 42 is connected to the Instead, the pressure compensator shows a higher absolute pressure, but this is controlled by the pressure relief valve 16 is limited at the top. This is on the input side to the auxiliary bore 88 and on the output side connected to the pump return via a further auxiliary bore 94. During the control chamber of the pressure compensator 14 when all three-position control valves are in their middle position, through the first one connected in series Auxiliary control channels 66 is relieved of pressure through, is attached to the control chamber 72 connected consumer connection via the associated second auxiliary control channel 76 in each case its pressure, while at the pump inlet P by the spring 90 of the Pressure compensator squat pressure is applied and thereby to that of the slide of the respective Three-position control valve formed control orifice each independent of the absolute Pressure there is a constant pressure gradient.

Because of the further details of such Control slide device reference can be made to the inventor's German utility model 1 968 337. It will also be understood that the number of three 4/3 three-position control valves in Fig. 1 and of two 3/3-position control valves in Fig. 2 are arbitrarily selected is. 3/3 and 4/3 three-position control valves can also be used in a single control slide device occur side by side. The chosen selection of the compilation is only chosen to clarify the situation.

The control of the double-acting actuating cylinders 54 of the three-position control valves 22 a or

22 b of the volume-regulated control slide device 11 takes place by means of a remote control part 100.

In this, each three-position control valve is a double-acting one Control pressure regulating valve 102 assigned. Instead of every double-acting control pressure regulating valve Of course, two single-acting control pressure regulating valves can also be used. the Each control pressure regulating valve is adjusted by an actuating device 104 of any suitable type, e.g. B. by a manual operation or an electromagnetic Activity. The control pressure regulating valves shown are of the slide type 4/3-way valve designed. The four connections are each input E, the Return connection W and the two outputs U and V, of which the respective output U in FIG. 1 via the first remote control lines 1, 2 and 3 or in F i G. 2 through the first remote control lines 1 and 2 with the associated control chamber 56 and the second outputs V in Fig. 1 through the first remote control lines 4, 5 and 6 and in FIG. 2 through the first remote control lines 4 and 5 to the control chamber 58 of the respectively assigned actuating cylinder 54 are connected. The interruption of all remote control lines as indicated by dashed line 106 shall be the remote arrangement of control slide device 11 and remote control part 100 illustrate. The assignment results from the identical numbers 1 to 8 of all remote control lines, from which the remote control lines 7 and 8 will be discussed later.

The spools 108 of each three position control valve 102 are arranged as a pressure reducing piston, the end faces of which each have an auxiliary control bore 110 are hydraulically connected to one of the two outputs U or V, so that the Pressure reducing piston in equilibrium between this hydraulic output pressure and a counteracting pressure reducing spring 112 is available. The compression of the pressure reducing spring is dependent on the actuation stroke of the actuation device 104.

This is independent of the pressure at input E. a servo pressure at output U or V, which is only applied by the counteracting Preload of the pressure reducing spring 112 and as a result of its dependence on compression from the actuation stroke only from the setting of the actuation device 104 depends.

Because of details of an advantageous structure of a hand-operated double-acting control pressure regulating valve and for further explanation of its Function is based on the same by the inventor under the title “double-acting Control pressure regulating valve «submitted parallel invention expressly pointed out.

In the remote control part 100 are as shown in the drawing 1 and 2, the supply lines of the connections E, W, U, V of each control pressure regulating valve 103 and also the auxiliary control bores 110 each as channels in a valve block 114 is formed, which is shown schematically by a dash-dotted border 116 is. In addition, end plates 118 and 120 are provided, which also have channel bores can be provided, in particular end plate 108. The individual blocks and End plates are combined to form a unit which has the shape of the in F i g. 4 shown and explained in more detail below Switch console can have.

All connections of the valve blocks assigned to connections E, W, U, V each control pressure regulating valve are designed as low-pressure lines Feruste control lines 1 to 8 connected, of which the lines ibis 6, as mentioned, lead to the actuating cylinders 54.

The return connection W of each control pressure regulating valve is over a second Ferusteuerleitung 7 with an input 122 of the line plate 120 a or 120b and via an output 124 leading out of this again and a separate one Return line 126 connected to the pump sump 152.

Finally, there is the one with the respective input E of each control pressure regulating valve connected third remote control line 8 is provided, which, like all other remote control lines 1 to 7 is designed as a low-pressure line. The Ferusteuerleitung 8 leads to an input 128 of the line plate 20a or 20b. In this is an exit channel 130 is provided, which is connected to the output 132 of a pressure reduction to 20 atm Fixed pressure reducing valve 133 is connected, which is in the line plate is installed, and its inlet 134 is connected to the pressure fluid inlet channel 44 is. The pressure reducing spring 136 is expediently set so that independently of the pressure present at the inlet 134 of the pressure reducing valve 133 in the third Ferusteuerleitung 130 there is a maximum servo control pressure of about 20 atü.

In the remote control device of Fig. 1, this servo control pressure constantly via the pressure fluid inlet channel 44 from the pump inlet 42 of the pressure compensator 14 removed. In the remote control device according to FIG. 2 is instead A line branch 138 is provided in front of the inlet 134 of the pressure reducing valve 133, which close with one branch 140 and one in the direction of the hydraulic fluid pump 34 Check valve 142 to the hydraulic fluid inlet channel 44 and its other branch 144 via two parallel-connected and closing in the direction of the U-cylinders 32 Check valves 146 and parallel pressure lines 148 and 150 separately with the two control chambers 30 of the two lifting cylinders 32 is connected.

Details of the structure of the pressure reducing valve 133 and its installation in the line plate 20 (20 a or 20 b) are shown in FIG. 3.

The pressure reducing piston 152 is in a guide bore 154 in the Line plate 20 arranged and on an elongated circumferential Ring groove 156 to both the channel 158 leading to the input 134 and to the channel 158 leading to the output 132 leading channel 160 connected. Further, in the pressure reducing piston 152 is a to the one end face 162 leading central bore 164 provided through radial branches 166 is constantly connected to the annular groove 156. In the Thus, the pressure fluid coming from the channel 158 does not only reach the position shown to the outlet 132, but also to the one on the end face 162 of the pressure reducing piston 152 formed control chamber 168, so that on the pressure reducing piston 152 in the Drawing a pressurization to the left takes place.

This pressurization acts with a fixed bias set pressure reducing spring 136 against, which is in a recess 170 in the line plate 20 is arranged at the other end of the pressure reducing piston 152 and with her one end on one wall of recess 170 and the other end on one Shoulder 172 of the pressure reducing piston is supported and moreover on a strrnseite Extension 174 of the pressure reducing piston 152 is held. The recess 170 is by means of a relief bore that expediently leads to the pump return or to the atmosphere 178 released.

When the pressure reducing piston 152 moves to the left in the drawing, closes its control edge 180 access to input 134 when the pressure is on Output 132 and thus also in the control chamber 168 in equilibrium with the counterforce the pressure reducing spring 136 is, since the channel 158 in the drawing is at one end the annular groove 156 is arranged. The channel 160, however, is constantly with the annular groove 156 in connection. The pressure prevailing at the outlet 132 is therefore independent of the pressure present in channel 158.

The line plate 20 can by means of clamping bolts, which through the transverse bores Reach through 182 of the line plate with the remaining blocks of the spool valve device 11 can be braced. In this case, the can laterally through the junction 184 to the annular groove 156 approaching channel 158 as a transverse bore directly in line with the one passing through Hydraulic fluid inlet channel are arranged.

As can be seen from FIG. 4 results, preferably all remote control lines are 1 to 8 flexible hose lines and in a multi-core flexible cable collection hose 186 summarized, the remote control part 100 with the control slide device 11 connects. In the embodiment shown in Fig. 4, which is based on the ratios the Fig. 1 is adapted, the individual double-acting control pressure regulating valves 102 of the remote control part 100 summarized in a switch console 188, the shop-like is formed and provided with a neck strap 190. The operation of each double-acting control pressure regulating valve 102 is carried out by means of one Hand lever 192, the one from the drawn center position, that of the normal position of the respective control pressure regulating valve, in one direction or the other of the double arrow 194 is pivotable to alternatively one or the other exit U or V of the control pressure regulating valve with the output of the third remote control line 8 connected pressure reducing valve 133 to connect.

Claims (10)

Claims: 1. Remote control device for a volume-controlled Control slide device for the volume-regulated control of the inflow and outflow of a hydraulic medium in one or more hydraulic consumer lines respectively. of these is used and a hydraulic pressure compensator and at least one Has three-position control valve, which is in slide design with pressure pump connection, Is formed return connection and one or two consumer connections and its control edges located between the pump connection and the respective consumer connection form a control orifice, the pressure gradient of which from the pressure compensator to one of each applied absolute pressure independent constant setpoint is regulated and the each with a hydraulic actuating cylinder for the slide of the respective three-position control valve is provided with a remote control part in which each control chamber of an actuating cylinder a 3/2-way control pressure regulating valve in slide design designed as a pressure reducer is assigned, the output of which is connected to a first hydraulic remote control line a control chamber of the associated actuating cylinder, its return connection Via a second hydraulic remote control line to the pump return of the hydraulic Pressure pump of the control slide device and its input via a third hydraulic Remote control line at least temporarily to the one used as the hydraulic fluid source The pump connection of the pressure compensator of the control slide device is connected, d a by c h g e - indicates that all hydraulic remote control lines (1 to 8) Low pressure lines are and the third remote control line (8) via a pressure reducing valve (133) is connected to its pressure fluid source (42; 30). 2. Remote control device according to claim 1, characterized in that that all hydraulic remote control lines (1 to 8) from flexible hose lines are formed. 3. Remote control device for a control slide device according to Claim 1 or 2, wherein the control slide of a three-position control valve in both working positions each through an associated hydraulic control chamber an actuating cylinder, in particular a single double-acting actuating cylinder, is adjustable, characterized in that the two control chambers (24, 26) the two outputs (U, V) of a 4/3-way control pressure regulating valve (102) each are connected via one of two first remote control lines (1 to 6), while the inlet (E) and the return connection (W) of the control pressure regulating valve with the third (8) and the second (7) remote control line are connected. 4. Remote control device according to one of claims 1 to 3, at which temporarily supplies the pressure medium source from a hydraulic pressure medium reservoir, in particular a filled control chamber of a working cylinder, formed and over a branch line is connected to the third remote control line, thereby characterized in that in the two branches (44, 144) of the pressure reducing valve (133) on the one hand to the pump connection (42) of the pressure compensator (14) and on the other hand to the pressure medium reservoir (30) leading branch line each have a check valve (142, 146) switched on which blocks in the direction of the respective pressure fluid source (42; 30). 5. Remote control device according to claim 4, characterized in that that several pressure medium reservoirs (30) parallel to one another at the inlet of the pressure reducing valve (133) can be connected and in their respective line connection (148, 150), respectively a check valve (146) is switched on. 6. Remote control device according to one of claims 1 to 5, at the pressure compensator, the respective three-position control valve and a final one Hydraulic line plate as structural units clamped together in a sandwich-like manner to form a block are, characterized in that the pressure reducing valve (133) in the line plate (20; 20a; 20b) is installed. 7. Remote control device according to claim 6, characterized in that that the line plate (20; 20a; 20b) with hose connections (122, 128) for the second and third remote control line (7, 8) is provided. 8. Remote control device according to claim 6 or 7, characterized in that that the input (134, 158) of the pressure reducing valve (133) to one through the structural units (10, 18 a resp. 18 b) of the block (11) running through hydraulic fluid supply channel (44) is connected. 9. Remote control device according to one of claims 1 to 8, characterized characterized in that the remote control part (100) as operated by an operator portable switch console (188) is formed, which is preferably formed like a shop and is provided with a neck strap (190). 10. Remote control device according to one of claims 1 to 9, characterized characterized in that all remote control lines (1 to 8) in a multi-core flexible line collecting hose (186) are summarized, the remote control part (100) connects to the control slide device (11).