ES2291564T3 - LOGIC VALVE CONTROL BLOCK. - Google Patents

Abstract

Control block for controlling a load, especially a hydraulic cylinder, whereby a base block (4) has pressure and return or tank connections. The base block has one or more attached block plates (6, 8) with one or several logic valves (14, 16, 18, 20) and a connection (A) to the load. The logic valves are for connection to one or more pressure chambers of the load.

Description

Control block with logic valves.

The invention relates to a control block with logic valves according to the preamble of claim 1.

These types of control blocks are used, for example, to control hydraulic cylinders, using Logic valves - or according to DIN standard: 2 cartridge valves ways - to control the pressure medium current to or from the hydraulic cylinder. This type of logic valves, too called 'logical', they can perform a distribution function, regulation and / or pressure and are used, in case of large flows, to reduce costs instead of conventional elements, it is that is, gate valves - tracks, blocking valves, valves pressure and flow control valves. To deploy and refolding a cylinder are necessary, for example, at least 4 logic valves, through which each of the pressure chambers with the pump (pump logic) or with the tank (tank logic).

In conventional solutions, as described, for example, in US 5,957,046, are used logical valves with associated pilot valves as valves of cartridge in a monobloc. In this monoblock they are configured all connections and connection channels for driving of the pressure medium. These are individual pieces of very complex construction that require considerable expense both in design as in manufacturing.

Document US 5,975,134 discloses a control block in which in a central block they are configured all connections and channels and logic valves are introduced in independent plates that are arranged in turn, again with the necessary pilot valves, on the side walls of the block central. This solution has the same disadvantages as the solution. described above since the conduction of channels in the Central block is extremely complex.

On the contrary, the invention is based on the objective of creating a control block with logic valves that It can be manufactured simply.

This goal is achieved thanks to a block of control with the features of claim 1.

According to the invention, the control block is performed with a base block in which they are configured at least a pressure connection and a tank or return connection. The Logic valves are fixed to the base block by one or more block plates, being configured on each block plate the corresponding consumer connection, and carrying each plate of block at least one pump logic and one tank logic. A Control block of this type can be manufactured so extremely simple given that the pressure and tank channels they can be easily configured in the base block and the connection to block plates can be manufactured using channels of short connection that can be introduced already during the process of casting or later through holes. Since the consumer connections are configured in each case in a block plate, the tubing of the connection side is fundamentally simpler than in the form of monobloc conventional.

Thanks to the modular structure according to the invention with a very simple base block and plates standardized blocks arranged with logic valves and consumer connections, the cost can be reduced fundamentally of construction compared to the solutions described above. He base block can be manufactured in principle as a casting block and can be cut according to need, that is, according to the number of block plates of this foundry block to be placed, so that delivery time can be shortened fundamentally of individually tailored solutions versus solutions conventional in which it was necessary in each case a new own foundry design.

The control block according to the invention is preferably used to control a differential cylinder (but also another different consumer), being associated in each case a block plate with a tank and pump logic in each case to both the piston side cylinder chamber, and also to the annular chamber on the side of the piston rod.

The structure of the base block is especially simple if the tank and pump channels run smoothly parallel and the corresponding connections lead to the side frontal.

At the determined pumping volume, the volume at through the two pump logics is always the same regardless of the direction of movement of the cylinder differential. When feeding pressure medium to the cylinder chamber,  only entered, depending on the surface ratio of the differential cylinder (for example, 2 to 1), half the volume of the pressure medium coming from the rod side chamber of the piston, while, in case of a medium feed of pressure to the chamber on the side of the piston rod from the cylinder chamber, double the volume is introduced. For optimize valve sizes, in a solution according to invention is proposed to be carried out in the unit associated with the chamber of piston rod side pressure pump logic greater that the tank logic and, in the unit associated with the chamber of the cylinder, the tank logic greater than the pump logic.

According to the invention, it is preferred that in the block base the tank channel have a greater useful cross section than the pump channel.

In an exemplary embodiment constructed in a manner especially simple this is achieved by connecting two in parallel tank channels linked together with approximately the same cross section.

In addition, it is preferred that these two channels of tank run in a plane parallel to a side surface and the pump channel is arranged in a central plane relative to the plane laid by the tank channels.

For the easiest assembly of the plates block it is advantageous that the base block is configured approximately in the form of a parallelepiped, leading to tank, pump and, if necessary, control connections preferably on the front side.

To simplify the structure of the plate block, in a preferred embodiment the axis is configured of a logic associated with the pump connection in parallel, and the axis of a logic associated with the perpendicular tank connection to the axis of the consumer connection. Alternatively, the axis of the consumer connection can also run perpendicular to the axis of the pump logic and parallel to the axis of the logic of tank.

Consumer connections can be configured on the large surface of the block plate away from the block base or on the side surfaces, the arrangement of the consumer connection on the smallest side surface of a parallelepiped shaped block plate.

Base block manufacturing can be facilitated additionally if the tank and pump channels are configured by tubes introduced in a casting process. The channels not necessary could then be blocked, for example, by locking screws

The connection channels run preferably forming a right angle to the channels of tank and pressure running parallel.

Other advantageous variants of the invention are subject of the other subordinate claims.

They are explained in detail below. preferred embodiments of the invention by drawings schematic They show:

Figure 1, a basic scheme of a block of control according to the invention with logic valves;

Figure 2, a perspective representation of a control block,

Figure 3, a section through a block of control for a circuit according to figure 1,

Figure 4, a perspective representation of another exemplary embodiment of a control block, and

Figure 5, a view of the example of embodiment according to figure 4.

Figure 1 shows intensely simplified a circuit in which a hydraulic cylinder 1 can connect via a control block 2 with a connection P of pressure or a tank T connection. Control block 2 has a base block 4 on which several block plates 6, 8 are fixed, hereinafter, by way of example, two. Block plate 6 is associated in this case with a cylinder chamber 10 on the side of the bottom and block plate 8 is associated with an annular chamber 12 in the side of the piston rod of the hydraulic cylinder 1 configured in a differential structural mode.

One block is configured on each block consumer connection A or B that leads to chambers 10, 12 of Pressure. Each of the block plates 6, 8 carries a logic 14 or 16 pump and a logic 18 or 20 tank. Through each of Logic pump 14, 16 can connect camera 10 or 12 of pressure associated with a pump channel 22 and by each of Logic tank 18, 20 can connect camera 12 or 10 of pressure associated with a tank channel 24. These two channels 22, 24 they run in block 4 base and are connected with the logic 14, 18; 16, 20 via connection channels 26, 28, 30, 32.

By means of the basic circuit described, you can replace in principle a conventional 3/4 distributor valve to control a differential cylinder, being able to provide jointly additional functions (return valve function, pressure and volume regulation) by valve selection adequate logic and previous controls. Each of the logics of Tank / pump indicated has a 2-way cartridge valve as well as one or several pilot valves (not shown), being able to a chamber of pressure is requested by means of pressure pressure acting in the closing direction of a closing sphere of the cartridge valve or connect with a tank.

Logic valves are performed, as appropriate application, with different control covers to connect the necessary pilot valves in each case.

As explained, for example, in "Technik der Zwei-Wege-Einbauventile; Der Hydrauliktrainer, vol. 4; Mannesmann Rexroth GmbH, 1st ed. "; A cartridge valve of this type is requested in the direction of opening by the pressure acting on the surface of the seat of the valve at the inlet connection and the pressure acting on an annular surface at the outlet connection. If this is deleted annular surface, then the cartridge valve can assume also a pressure limiting function. For example, you can it is advantageous to use such a variant with 0% of annular surface for rod side tank logic of the plunger. The block plates 6, 8 are made so that the base body (housing) is always the same and all functions for the movement and regulation of a cylinder arranged so  perpendicular or horizontal or other consumer can be realized by means of corresponding logic valves and previous control.

Figure 2 shows a representation three-dimensional control block 2. Correspondingly, the base block 4 is configured as a cast iron block of parallelepiped on whose front surface 34, visible on the Figure 2, two tank channels 24a, 24b connected between yes, as well as pump channel 22, so that on the front side is configured, through connection training elements corresponding, a tank connection T or a connection P of Pressure. In the base block, X, Y channels of control, not shown.

Channels 24a, 24b, 22 cross block 4 base with a parallel separation, the two being arranged tank channels 24a, 24b in a plane that runs parallel to the rear lateral surface 36, and a central plane disposed between the two tank channels 24a, 24b cuts the axis of the channel 22 of bomb.

On the lateral surfaces 38, 40, 42 are arranged through connection channels (not shown) yet several block plates 6, 8, as well as other valve devices 44, for example, an arrangement of valves for movements accessories, etc. Block plates 6, 8 and devices 44 of valve can be fixed practically in any of the lateral surfaces 36, 38, 40, 42. So, for example, the lateral surface 40 may be covered with a plurality of block plates 6 arranged parallel to each other and associated in each case to a cylinder pressure chamber on the bottom side, while on one of the other lateral surfaces 38, 42 are fixed the block plates 8 on the side of the piston rod. Each side of the base block 4 may be covered with plates of block or valves. The length L of the control block depends on the number of block plates to be fixed, cutting a 4 base block with this length L according to the need for a block of prefabricated cast iron in which at least they are already configured at least channels 22, 24.

As can be seen in Figure 2, in the 6, 8 block plates are used logic circuit valves, for example, pump logic 14 or 16 and logic 18 or 20 of tank. According to the invention, in this case the holes of introduction for accommodation of the main levels of the logic valves that sit on block plate 6, 8 are configured on the corresponding block plate 6, 8. Besides, the block plate can carry other logic valves and others valve devices for additional functions, for example, to unload the cylinder before descent, as well as points of measurement for pumps and consumer connections. A particular feature of the invention is that connections A, B of consumer are also configured on plates 6 or 8 of block and not, as in the state of the art, together with the Tank and pump connection in a monoblock.

The useful cross section of channel 24 of tank consisting of the two channels 24a, 24b of fork Choose fundamentally greater than that of pump channel 22.

Due to the different camera volumes 10 of the annular cylinder and chamber 12 and the different volumes corresponding pressure medium to be fed or evacuate, the tank logic 18 of the block plate 6 is performs with almost twice the cross section that the pump logic 14 of block plate 5 associated with chamber 10 of cylinder while the tank logic 20 of the plate 8 of block associated with the annular chamber 12 is made smaller than the associated pump logic 16. In this case, tank logic 18 of the block plate 6 has the maximum nominal size.

Figure 3 shows a cut through another embodiment of a control block 2. In this variant, several plates are fixed on the base block 4 block, the perpendicular block plates 6 being arranged to the drawing plane in figure 3 one behind the other in the lateral surface 42 and the block plates 8 being arranged correspondingly on the adjacent lateral surface 40. Also these block plates 6, 8 house in each case a logic 14 or 16 pump and an 18 or 20 tank logic. The main level of the pump logic is inserted in a hole 5 of introduction and the main level of tank logic is inserted in a hole 7 for insertion of the block plate correspondent. As can be seen from the representation in cut, the two tank channels 24a, 24b are linked together via the connection channel 30 that runs perpendicular to the lateral surface 40 with logic output connection 46 tank, as well as, through the connection channel 28, with the output connection of tank logic 18. The pump channel 22 is connected by the connection channel 32 with the connection 48 of pump logic input 16 of block plate 8, as well as, via connection channel 26, with the input connection, no shown, of the pump logic 14 of the block plate 6.

According to the representation of figure 3, the channels 26, 28; 30, 32 connection are configured as holes  that run perpendicular to the lateral surfaces 40, 42 corresponding, so that these can be entered then easily in block 4 prefabricated base. By triangular displacement of channels 24a, 24b, 22 connection channels can be configured extremely simple without a risk of crosslinking. In case of large serial blocks in principle it is also possible to configure these connection channels also during the casting process.

In a manufacturing variant especially simple, at least channels 244 and 22 are configured using the introduction of steel tubes, so that after the process of Casting holes are not required. The steel tubes are fastened in the casting block by joining material and are designed so that no glow can occur.

Especially in the case of large blocks of control with a plurality of logic valves results especially advantageous that one type of valve is screwed logics, for example, all logics 14, 16. . . pump in the base surface of the plates 6, 8,. . . block side connection separated from the base 4 block, while the others logics, for example, logics 18, 20. . . tank is placed on side surfaces of block plate 6, 8. From this way, the channel conduction is configured very clear and simple to configure since then the axes of the Logic 18, 20 tank run parallel to the surface outer side of block plate 6, 8, or expressed from another way, they run perpendicular to the axis of connections A, B, while the axes of the pump logic 14, 16 are oriented perpendicular to the outer lateral surfaces or parallel to the connection axes, so also the sections of the connection channels configured in the nozzle plates 6, 8, as well as the holes for the logic valves they can be configured very simply as holes that they run at a right angle to each other.

Naturally, in the embodiment example shown in figure 3 block plates can also be fixed in lateral surfaces 38 and 36.

In the embodiments above described, consumer connections A, B are configured in the large surface 50 of the block plates 6, 8 away from the 4 base block. In the solution shown, for example, in the figure 2, it is disadvantageous that access to consumer connection A it is relatively bad given that in this large area 50 of the block plate 6 is already arranged pump logic 14 and other valve device 52.

To solve this disadvantage, in the example of embodiment shown in Figures 4 and 5, connections A, B of consumer are configured on the front surfaces 54, 56 of the block plates 6, 8 that run perpendicular to the 50 large surface. In the representation according to figure 4, only the consumer connection B of the block plate 8 is shown, no consumer connection A can be seen on front surface 56 of block plate 6.

Figure 5 shows a view of the example of embodiment according to figure 4, in which plate 6 is omitted from block. The drawn block plate 8 is associated with the chamber 12 ring the cylinder 1 (see figure 1). So correspondingly, the pump logic 16 is fixed on the surface 50 large block plate 8 separated from base block 4. The tank logic 20 is arranged on the front surface 56, which it is arranged below in figure 5, of the block plate 8. The consumer connection B is provided on the front surface 54 upper opposite to the one that can be freely accessed, so that the assembly of the conduits that lead consumers are facilitates considerably with respect to the described solution previously. In this exemplary embodiment, the connection channel 32 which leads to pump channel 22 is positioned inclined with respect to the connection channel 30 leading to the tank channel 24b and flows into an intake channel 58 of the block plate 8. This flows into the inlet connection 48 of the hole 5 of introduction, on which the main level of logic is based 16 pump. The connection channel 30 flows into a channel 60 of admission on the side of the tank connection, whereby generates the connection between the tank channel 24b and the hole 7 of Introduction of tank logic 20. The structure of the plate 6 block is correspondingly, leading to the connection of front surface work 56.

As in the embodiment according to Figure 3, also exists in the embodiments according to Figures 4 and 5, between the consumer connection of the plate block, the side connection of the opening hole 5 and the axial connection of the insertion hole 7 a fluid connection open as illustrated by the indicated holes in striped form.

The dimensions of the block plates 6, 8 they are chosen differently in the embodiment shown in Figure 4, however, the dimensions and elements of connection formation of block plates 6, 8 are standardized, so that the control blocks can be adapted in a simple way to the corresponding operating conditions (nominal widths, number of consumers, etc.) through the coupling of several standardized base modules (plates 6, 8 of block, base block).

The control block 2 described above is Used to control differential cylinders. Naturally with this type of control blocks can also be controlled other consumers, for example, synchronization cylinders, engines Hydraulic or similar.

A control block is disclosed for control a consumer, spatially a hydraulic cylinder, being configured in a base block at least one connection of pressure and a tank or return connection. In the base block is fixed at least one block plate with at least one logic valve, a consumer connection is configured on the board block.

List of reference numbers

       \ global \ parskip0.970000 \ baselineskip
    

one

Hydraulic cylinder

2

Control block

4

Base block

5

Introduction hole

6

Block plate (bottom)

7

Introduction hole

8

Block plate (piston rod)

10

Cylinder chamber

12

Annular chamber

14

Pump Logic (6)

16

Pump Logic (8)

18

Tank Logic (6)

twenty

Tank Logic (8)

22

Pump channel

24

Tank channel

26

Connection channel

28

Connection channel

30

Connection channel

32

Connection channel

3. 4

Front surface

35

Front surface

36

Posterior lateral surface

38

Lateral surface

40

Lateral surface

42

Lateral surface

44

Valve device

46

Output Connection (20)

48

Input connection (16)

fifty

Large surface of the block plate (6, 8)

52

Valve device

54

Front surface

56

Front surface

58

Admission channel

60

Admission channel

Claims (15)

1. Control block with logic valves to control a consumer with at least one pressure chamber (10, 12), with a base block made of channels (22), (24) of pressure medium that carries the valves (14 ), (18); (16), (20) logic, characterized in that one or more valves (14), (18); (16), (20) logic associated to the consumer pressure chamber (10, 12) are fixed in each case to a plate (6), (8) of the block in which a connection (A, B) is configured of consumer for connection with the pressure chamber, and which is in turn fixed to the base block (4), in which at least one pressure connection (P) and a tank or return connection (24) are configured, as well as channels (26), (28), (30), (32) of connection for the block plate (6), (8), a plate (6) associated with each pressure chamber (10, 12) , (8) of block that carries at least one logic (14), (16) of pump and one logic (18), (20) of tank. 2. Control block according to claim 1, in which the consumer is a cylinder (1). 3. Control block according to claim 2, in which to a piston-side cylinder chamber (10) and to a annular chamber (12) of the piston rod side is associated in each case a standardized block plate (6, 8). 4. Control block according to claim 2 or 3, in which the tank and pump channels (22, 24) are configured so that they run parallel in the block (4) base. 5. Control block according to claim 4, in which the tank channel (24) has a cross section effective greater than the pump channel (22). 6. Control block according to claim 5, in which two channels (24a), (24b) are connected in parallel tank with an approximately equal cross section. 7. Control block according to claim 3, in which the tank logic (18) of the block plate (6) associated to the cylinder chamber (10) has a larger nominal size that the corresponding pump logic (14), and the logic (16) of pump of the block plate (8) associated with the annular chamber (12) has a nominal size larger than the tank logic (20) correspondent. 8. Control block according to one of the preceding claims, wherein the base block (4) is configured in the form of a parallelepiped, and the plates (6, 8) of block are discretionary fixed on the surfaces (36, 38, 40, 42) lateral. 9. Control block according to the claims 6 and 8, in which the two tank channels (24a, 24b) are arranged primarily in a plane parallel to one of the lateral surfaces (36). 10. Control block according to claim 9, in which, seen in cross section, the pump channel (22) and the two tank channels (24a, 24b) are arranged so triangulate each other. 11. Control block according to one of the preceding claims, wherein the axis of logic (14, 16)  pump runs in parallel and the axis of logic (18, 20) of tank runs perpendicular to the axis of the connection (A, B) of consumer. 12. Control block according to one of the claims 1 to 10, wherein the axis of the connection (A, B) of consumer runs parallel to the axis of the tank logic (18, 20) and perpendicular to the axis of the pump logic (14, 16). 13. Control block according to claim 11 or 12, in which the consumer connection (A, B) is arranged in the large surface (50) away from the base block (4) (according to the claim 11) or on a lateral surface, preferably in the smaller front surface (54, 56) (according to claim 12) of the block plate (6, 8). 14. Control block according to one of the preceding claims, wherein the channels (20, 24) of pump and tank are configured by tubes inserted in a casting process 15. Control block according to claim 8, in which the axis of the connection channels (26, 28, 30, 32) runs perpendicular to the lateral surfaces (38, 40, 42) associated.