CN113530902A - Hydraulic control system, valve block device thereof and hydraulic equipment - Google Patents

Abstract

The application provides a hydraulic control system, a valve block device thereof and hydraulic equipment. The hydraulic block arrangement (130) comprises: an input (b1) hydraulically coupled to a first port (a1) of a pilot valve (120) of a hydraulic control system (100) and receiving hydraulic fluid therefrom; a control end (b2) hydraulically coupled to a second port (a2) of the pilot valve (120) and receiving hydraulic fluid as a control signal from the second port; an output (b11) hydraulically coupled to the input for outputting all or a portion of the hydraulic fluid received from the input; and a relief end (T) configured to allow a portion of the hydraulic fluid received at the input end (b1) to be released therefrom when the control end (b2) receives hydraulic fluid.

Description

Hydraulic control system, valve block device thereof and hydraulic equipment

Technical Field

The present application relates generally to hydraulic control, and more particularly, to a valve block apparatus for use in a hydraulic control system, a hydraulic control system including the valve block apparatus, and a hydraulic device.

Background

The hydraulic control system has been widely used in various mechanical devices because of its advantages of small size, light weight, sensitive action, and being able to realize frequent start and direction change.

In the existing hydraulic control schemes, in order to realize the control of the hydraulic actuator, a plurality of control elements such as a check valve, a solenoid valve, and a relief valve are often adopted. The existing scheme has the problems of more elements, complex structure and low reliability.

Accordingly, further improvements to existing hydraulic control systems are needed.

Disclosure of Invention

The hydraulic control scheme is simple in structure, efficient and reliable.

To this end, according to one aspect of the present application, there is provided a valve block apparatus for use in a hydraulic control system, comprising: an input configured to hydraulically couple with a first port of a pilot valve of a hydraulic control system and receive hydraulic fluid from the first port; a control end configured to hydraulically couple with a second port of the pilot valve and receive hydraulic fluid from the second port as a control signal; an output configured to be hydraulically coupled with the input for outputting all or a portion of the hydraulic fluid received from the input; and a relief end configured to allow a portion of hydraulic fluid received at the input end to be released from the relief end when hydraulic fluid is received at the control end.

According to one possible embodiment, the valve block arrangement comprises a first restrictor and a pressure control valve; one end of the first restrictor is hydraulically coupled with the input end of the valve block device, and the other end of the first restrictor is hydraulically coupled with the output end of the valve block device; and the pressure control valve has an input port hydraulically coupled to the other end of the first restrictor, an output port hydraulically coupled to the pressure relief port, and a control port hydraulically coupled to the control port of the valve block arrangement.

According to a possible embodiment, the valve block arrangement further comprises a one-way valve connected between the output port of the pressure control valve and the pressure relief end, such that hydraulic fluid can only flow from the output port to the pressure relief end.

According to one possible embodiment, the pressure control valve has a communication state such that its input port is in fluid communication with the output port when the hydraulic pressure of the hydraulic fluid received at its control port reaches an activation value, so that a portion of the hydraulic fluid received at the input of the valve block arrangement is released from the relief port via the pressure control valve.

According to a possible embodiment, the valve block arrangement further comprises a second restrictor having one end hydraulically coupled to the other end of the first restrictor and the other end hydraulically coupled to the input port of the pressure control valve, and the damping coefficient of the first restrictor and/or the second restrictor is adjustable so as to adjust the proportion of the hydraulic fluid received at the input of the valve block arrangement that is diverted between its output and its pressure relief end.

According to one possible embodiment, the spool of the pressure control valve comprises a stem having a central bore and a spring connected to an axial end of the stem, the spring defining a spring chamber, one end of the spring chamber being in fluid connection with the central bore and the other end being in fluid connection with the pressure relief end; and the second flow restrictor is disposed within the valve stem and fluidly connected to the central bore.

According to one possible embodiment, the valve block assembly further includes a pressure balancing port, the spool of the pressure control valve includes a stem and a spring connected to an axial end of the stem, the spring defining a spring chamber; and the spring cavity is fluidly connected to the pressure balancing port.

According to one possible embodiment, the valve block assembly further includes a pressure balancing port, the spool of the pressure control valve includes a stem and a spring coupled to an axial end of the stem, the spring defining a spring chamber, the stem having a central bore fluidly coupled to the spring chamber and to the control end of the valve block assembly, respectively; the valve rod is provided with a first rod part and a second rod part along the axial direction, and the cross sectional area of the first rod part is smaller than that of the second rod part; and the pressure balance port is fluidly connected to a junction of the first and second stem portions such that hydraulic fluid flows from the pressure balance port or from the pressure balance port into the spring chamber via the spring chamber during axial movement of the valve stem connected to the spring to connect or disconnect the input and output of the pressure control valve.

According to a possible embodiment, the size of the pressure balancing port is adjustable, or a throttle valve is provided on the flow path connecting from the spring chamber to the pressure balancing port, thereby adjusting the operating characteristics of the pressure control valve.

According to one possible embodiment, the stem of the spool of the pressure control valve has an annular groove in an axially intermediate portion, and the pressure control valve has a communication state such that the input port thereof is in fluid communication with the output port when the annular groove is in fluid communication with the input port of the valve block device.

According to one possible embodiment, the valve cartridge of the pressure control valve comprises a stem and a spring connected to an axial end of the stem, the spring defining a spring chamber in fluid connection with the relief end.

According to another aspect of the present application, there is provided a hydraulic control system including: a first hydraulic actuator for performing a first operation; a pilot valve having a first port and a second port configured to control the flow of hydraulic fluid out of the first port and/or the second port; the valve block device as described above, having an input hydraulically coupled to the first port, a control port hydraulically coupled to the second port, an output, and a pressure relief port; and a first master control valve hydraulically coupled to the output and a first actuator, respectively, to control a first operation of the first actuator based on a hydraulic signal of hydraulic fluid output by the output.

According to a possible embodiment, the hydraulic control system further comprises: a second hydraulic actuator for performing a second operation, the second operation constituting a compound action together with the first operation; and a second main control valve which is respectively and hydraulically coupled with a second port of the pilot valve and a second hydraulic actuator so as to control the second operation of the second hydraulic actuator based on the hydraulic signal of the hydraulic fluid output by the second port.

According to one possible embodiment, one or more of the first operation, the second operation and the compound action are regulated under logical control of the valve block arrangement.

According to a further aspect of the present application, there is provided a hydraulic apparatus equipped with the valve block apparatus as described above or the hydraulic control system as described above.

It can be seen that according to the technical solution of the present application, hydraulic logic control is achieved with a simplified structure by integrating a small number of elements in one valve block device. Moreover, according to the technical scheme of this application, easy operation has promoted hydraulic control's reliability, because only need rely on a small amount of components and between them the action can realize hydraulic control, do not have the unstability or the unusual factor that the complicated structure that constitutes by many components leads to. Moreover, according to the technical scheme of the application, the cost is also reduced, and the hydraulic logic control can be realized by only adopting a small number of elements.

Drawings

Fig. 1 is a schematic block diagram of a hydraulic control system according to one possible embodiment of the present application.

Fig. 2 is a fluid circuit diagram of a valve block arrangement of the hydraulic control system of fig. 1.

Fig. 3A and 3B are cross-sectional views of two states of the valve block assembly of fig. 2.

FIG. 4 is a cross-sectional view of another implementation of the valve block apparatus of FIG. 2.

FIG. 5 is a fluid circuit diagram of yet another implementation of the valve block apparatus of FIG. 2.

FIG. 6 is a fluid circuit diagram of yet another implementation of the valve block apparatus of FIG. 2.

Fig. 7 is a cross-sectional view of the valve block assembly of fig. 6.

FIG. 8 is a fluid circuit diagram of yet another implementation of the valve block apparatus of FIG. 2.

Fig. 9 is a cross-sectional view of the valve block assembly of fig. 8.

Detailed Description

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

Fig. 1 schematically illustrates a hydraulic control system 100 according to a possible embodiment of the present application, which mainly comprises: hydraulic actuator unit 110, pilot valve 120, valve block assembly 130, and main control valve unit 140. The following describes portions of the hydraulic control system 100 in detail.

Referring to fig. 1, the hydraulic actuator unit 110 includes two hydraulic actuators, i.e., a first hydraulic actuator 111 and a second hydraulic actuator 112. The first hydraulic actuator 111 is used to perform a first operation, for example, a linear motion or a rotational motion. The second hydraulic actuator 112 is used to perform a second operation, for example, a linear motion or a rotational motion. The first operation performed by the first hydraulic actuator 111 and the second operation performed by the second hydraulic actuator 112 may together constitute a compound action of a machine (e.g., a hydraulic device equipped with the hydraulic control system 100).

It will be appreciated that although hydraulic implement unit 110 is shown in FIG. 1 as including two actuators, hydraulic implement unit 110 may be implemented to include other numbers of hydraulic actuators, e.g., only one or more than two, depending on the particular application. Where the hydraulic implement unit 110 includes two or more hydraulic actuators, some or all of the hydraulic actuators work together to achieve a compound action of the hydraulic device.

In one embodiment, the first hydraulic actuator 111 may be implemented as a hydraulic cylinder or a motor. The second hydraulic actuator 112 may be implemented as a hydraulic cylinder or a motor. In fig. 1, the second hydraulic actuator 112 is implemented as two parallel hydraulic cylinders 112A and 112B. It should be appreciated that the first and second hydraulic actuators 111 and 112, respectively, may be suitably configured depending on the particular application, and are not limited thereto.

The pilot valve 120 includes a plurality of ports for controlling the hydraulic fluid (e.g., hydraulic oil) as a pilot fluid to flow out from one or more of the plurality of ports, so that the hydraulic fluid flowing out from different ports respectively flows into the corresponding flow paths of the hydraulic control system 100. The pilot valve 120 may be implemented as an operating handle, and an operator may control which port or ports of the pilot valve the pilot fluid flows from by adjusting the direction of the operating handle.

Referring to fig. 1, the pilot valve 120 has a first port a1, a second port a2, a third port a3, and a fourth port a4 for the outflow of hydraulic fluid, and a port P coupled to a source of hydraulic fluid (not shown). The pilot valve 120 receives hydraulic fluid from a hydraulic fluid source through port P and controls the flow of hydraulic fluid out of one or more of the first through fourth ports.

The main control valve unit 140 is used to control the hydraulic actuator unit 110. Referring to fig. 1, the main control valve unit 140 mainly includes a first main valve 141 for controlling the first hydraulic actuator 111 and a second main valve 142 for controlling the second hydraulic actuator 112. The input ports c1 and c4 of the first master valve 141 are hydraulically coupled with the output port b11 of the valve block arrangement and the fourth port a4 of the pilot valve 120, respectively. The output ports a1 and B1 of the first main control valve 141 are hydraulically connected with the oil inlet of the hydraulic cylinder of the first hydraulic actuator. Thus, the first master valve 141 controls the operation of the first hydraulic actuator unit 111 based on the hydraulic signal of the hydraulic fluid output from the output terminal b11 of the valve block arrangement. The input ports c2 and c3 of the second master valve 142 are hydraulically connected with the second ports a2 and a3 of the pilot valve 120, respectively. Output ports A2 and B2 of the second main control valve 142 are respectively in hydraulic connection with oil inlets of hydraulic cylinders of the second hydraulic actuator. Thus, the second main control valve 142 controls the operation of the second hydraulic actuator unit 112 based on the hydraulic signal of the hydraulic fluid output from the pilot valve.

The valve block device 130 has a function of hydraulic logic control, which controls the pressure input of an input port c1 of the main valve unit using hydraulic pressure (e.g., static pressure or dynamic pressure of hydraulic oil) as a control signal, thereby controlling the operation of the hydraulic actuator unit 110.

Referring to fig. 2, the valve block assembly 130 has an input terminal b1, an output terminal b11, a control terminal b2, a pressure relief terminal T, and a pressure balancing terminal T'. The valve block assembly 130 may be implemented to include a first choke 131, a second choke 132, a pressure control valve 133, and a check valve 134. The pressure control valve 133 has an input port, an output port, and a control port. The pressure control valve 133 may be implemented as a spool valve or other spool structure capable of performing the above-described functions.

Referring to fig. 1 and 2, the input b1 of the valve block arrangement 130 is hydraulically coupled to the first port a1 of the pilot valve 120 to receive hydraulic fluid from the first port a 1. The control end b2 of the valve block arrangement 130 is hydraulically coupled to the second port a2 of the pilot valve 120 to receive hydraulic fluid from the second port a 2. The hydraulic signal of the hydraulic fluid received at the control terminal b2 is used as a control signal for the valve block assembly 130. The output b11 of the valve block arrangement 130 is hydraulically connected to the input c1 of the first main control valve 141. The first throttle 131 has one end connected to the input end b1 and the other end connected to the output end b 11. One end of the second restriction 132 is connected to the other end of the first restriction, i.e., the other end of the first restriction, one end of the second restriction, and the output b11 are all in fluid communication. The other end of the second restrictor is connected to an input port of a pressure control valve 133. The control port of the pressure control valve 133 is connected to the control end b2 of the valve block assembly 130. The check valve 134 is connected between the output port of the pressure control valve 133 and the relief port T so that the hydraulic fluid can flow only from the output port to the relief port T.

Referring to fig. 3A and 3B, the spool of the pressure control valve 133 is implemented to include a valve plug 1331, a valve stem 1332, and a spring 1333, which are sequentially connected in an axial direction. The spring 1333 is connected to one axial end of the valve stem 1332 and defines a spring chamber. The spring chamber is hydraulically connected to a pressure balancing port T' of the valve block assembly 130. The pressure balance port T' may be connected to a tank (not shown). The valve stem 1332, which is connected to the spring 1333, moves axially to compress the spring 1333 to place the input and output ports of the pressure control valve 133 in fluid communication, so that hydraulic fluid flows through the check valve 134 and to the relief port T, during which the spring chamber hydraulic fluid flows out of the pressure balance port T'. The spring 1333 is restored and the valve rod 1332 connected to the spring 1333 is moved in the axial direction, thereby disconnecting the input and output ports of the pressure control valve, during which hydraulic fluid flows from the pressure balancing port T' back to the spring chamber.

With continued reference to fig. 3A and 3B, in one embodiment, the valve stem has an annular recess S in the middle thereof, and when the valve stem 1332 is moved such that the annular recess S is in fluid communication with the input end B1 of the valve block assembly 130, the input and output ports of the pressure control valve 133 are communicated, and the pressure control valve is in a communicating state (see fig. 3A). When the annular groove S is not in fluid communication with the input port B1, the input and output ports of the pressure control valve 133 are not in fluid communication, and the pressure control valve is in the open state (see fig. 3B). During the movement of the valve stem 1332, if there is a high pressure at the relief end T, an additional port, i.e., a pressure balancing port T', may be provided to ensure that a lower pressure is maintained in the spring chamber, thereby ensuring smooth movement of the valve stem. Thus, even if high pressure exists at the relief end T, communication of the pressure control valve 133 can be achieved.

The pressure control valve 133 places its input port and output port in fluid communication when the hydraulic pressure of the hydraulic fluid received at its control port reaches an activation value, so that a portion of the hydraulic fluid received at the input b1 of the valve block arrangement 130 is released from the relief port T via the pressure control valve 133. That is, in the case where the input port and the output port of the pressure control valve 133 are in fluid communication, a part of the hydraulic fluid received at the output port b1 of the valve block device 130 flows out from the output port b11 via the first restrictor 131, and the other part is discharged from the relief port T via the first restrictor 131, the second restrictor 132, the pressure control valve 133, and the input and output ports, the check valve 134 in this order. It can be seen that the hydraulic fluid received at the output end b1 of the valve block arrangement 130 is branched, and the hydraulic signal (hydraulic pressure) of the hydraulic fluid output from the output end b11 is changed due to the branching, so that the first operation of the first actuator is also changed according to the change of the hydraulic signal.

In one embodiment, the split ratio of the hydraulic fluid received at the output b1 of the valve block assembly 130, i.e., the ratio of the hydraulic fluid received at the output b1 of the valve block assembly 130 that flows out of the output b11 and the relief end T, respectively, may be adjusted by changing the throttling factor (e.g., changing the throttling aperture and/or the throttling length) of one or both of the first and second restrictors 131 and 132. For example, the first throttle 131 and the second throttle 132 may be implemented as a throttle valve, respectively. The damping coefficient (throttle coefficient) of the throttle valve for the fluid passing through it can be varied by adjusting the throttle area and/or the throttle length of the valve.

In one embodiment, the size of the pressure balance port T 'may be adjusted so that the velocity of the hydraulic fluid flowing out of or into the pressure balance port T' may be adjusted, thereby adjusting the operating characteristics of the pressure control valve 133, for example, whether the pressure control valve 133 quickly changes to a connected state or a disconnected state, or slowly changes to a connected state or a disconnected state. In another embodiment, a throttle valve (not shown) may be provided on a flow path connected to the pressure balance port T 'so that the speed of the hydraulic fluid flowing out of or into the pressure balance port T' may be adjusted, whereby the operation characteristics of the pressure control valve 133 may be adjusted.

Referring to fig. 2, the check valve 134 may be implemented to include a valve ball or spool and a spring connected to the valve ball or spool. The ball or spool is hydraulically connected to the output port of the pressure control valve 133 and the spring cavity formed by the spring of the check valve 134 is hydraulically connected to the relief port T. The check valve 134 may be configured to open when the control end b2 of the valve block assembly 130 receives hydraulic fluid from the pilot valve. That is, the check valve 134 and the pressure control valve 133 of the valve block assembly 130 are both controlled by the hydraulic signal at the control end b2 thereof.

The operation of the valve block assembly 130 is described below with reference to fig. 1-3.

First, by operating the pilot valve 120 such that the hydraulic fluid flows out only from the first port a1 of the pilot valve 120 to flow to the first input port b1 of the valve block apparatus 130, for example, the input port b1 may be supplied with a constant flow rate of hydraulic fluid. At this time, the pressure control valve 133 is in an off state (e.g., the state shown in fig. 3B), that is, the control end B2 of the pressure control valve 133 does not receive a hydraulic signal (hydraulic signal of hydraulic fluid) as a control signal so that there is no fluid communication between its input and output ends, and the hydraulic pressures of the input port B1 and the output end B11 are equal. Hydraulic fluid is communicated to the first master valve 141 (e.g., port c1 of the first master valve 141) via flow path b1-b11 to communicate with the first master valve 141. Then, the hydraulic fluid enters the oil inlet of the first hydraulic actuator 111 via the first main control valve 141 to actuate the first operation of the first hydraulic actuator 111.

Then, the hydraulic fluid flows out from the second port a2 of the pilot valve 120 to the control end b2 of the valve block arrangement 130 by operating the pilot valve 120. Both the pressure control valve 133 and the check valve 134 are opened under the control of the hydraulic signal at the control terminal b 2. At this time, the hydraulic fluid received from the input port b1 is discharged from the relief port T through the pressure control valve 133 via the bypass path, in addition to entering the first main valve 141 via the flow path b1-b 11. That is, the hydraulic fluid flowing in from the input end b1 has two flow paths, one of which is from the input end b1 to the output end b11 via the first orifice 131, and the other of which is from the input end b1 to the relief end T via the first orifice 131, the second orifice 132, the input end and the output end of the pressure control valve 133, and the check valve 134 in this order.

It can be seen that once the control end b2 of the valve block arrangement 130 receives hydraulic fluid (hydraulic signal), it triggers bypass of the flow paths b1-b11, which acts as a shunt, thereby regulating the hydraulic signal (hydraulic pressure) delivered to the first hydraulic actuator 111. Further, it is possible to function to adjust the first operation of the first hydraulic actuator 111, and also to indirectly adjust the composite operation made up of the first operation and the second operation.

It will be appreciated that although the above describes an embodiment in which the input b1 is supplied with hydraulic fluid first and the control b2 is supplied with hydraulic fluid later, it is also possible that the control b2 is supplied with hydraulic fluid first and the input b1 is supplied with hydraulic fluid later. In the embodiment where the control terminal b2 is supplied with hydraulic fluid first and the input terminal b1 is supplied with hydraulic fluid later, the hydraulic signal is transmitted to the second hydraulic actuator 142 first to actuate the second operation, and both the pressure control valve 133 and the check valve 134 are in the on state, and once the input terminal b1 is supplied with hydraulic fluid, the flow paths b1-b11 and the bypass thereof are simultaneously communicated with hydraulic fluid. This embodiment can also provide the effects and actions of the adjustment and control as described above.

It will be appreciated that the valve block arrangement 130 illustrated in fig. 1 may be implemented without the second choke 132, i.e. in the case of bypass conduction, hydraulic fluid enters the input port of the pressure control valve 133 directly after passing through the first choke 131.

It will be appreciated that the valve block arrangement 130 illustrated in figure 1 may be implemented without the inclusion of the check valve 134, i.e. with bypass open, hydraulic fluid is vented directly from the relief port T via the output port of the pressure control valve 133. This case is suitable for a situation where no pressure shock (or high pressure) occurs at the pressure relief end T.

Valve block assembly 130 has a variety of implementations. Other implementations of the valve block assembly 130 are described below with reference to fig. 4-9.

FIG. 4 illustrates a valve block assembly 130 according to another implementation of the present application. The valve block apparatus 130 illustrated in fig. 4 is different from the valve block apparatus 130 of fig. 1 in that a stem 1332 of a spool of the pressure control valve 133 has a stepped structure, i.e., the stem includes a first stem portion a having a smaller cross section and a second stem portion B having a larger cross section. Also, the pressure balance port T' is connected to the junction C of the first stem portion a and the second stem portion B, rather than to one end of the spring chamber of the spool as in the valve block arrangement 130 of fig. 3A and 3B. The valve block assembly 130 illustrated in fig. 4 also differs from the valve block assembly 130 of fig. 3A and 3B in that the central portion of the valve stem 1332 has a central through bore H that is in hydraulic communication with both the spring chamber and the control end B2 of the spool, thereby equalizing the pressure acting on the larger cross-sectional portion B and the smaller cross-sectional portion a of the valve stem 1332, and in the event that the areas of the two are not equal, the pressure acting on the first stem portion a having a smaller cross-section is different from the pressure acting on the second stem portion B having a larger cross-section, and the pressure acting on the area difference between the larger cross-section and the smaller more interface can be used to overcome the spring force of the spring 1333, thereby bringing the input port and the output port of the pressure control valve 133 into fluid communication.

In this implementation, during axial movement of the valve stem 1332 to place the input port and the output port of the pressure control valve 133 in fluid communication, the pressure differential acting between the larger cross-section and the smaller cross-section overcomes the spring force of the spool spring 1333 and releases hydraulic fluid from the pressure balancing port T', thereby placing the input and output ports of the pressure control valve 133 in fluid communication. This implementation is particularly useful in situations where the spring cavity of the valve spool cannot be connected to the pressure balance port T 'because in this implementation, the pressure balance port T' need not be connected to the spring cavity of one axial end of the valve stem 1332, but rather to the middle portion of the valve stem (the junction C of the first stem portion a and the second stem portion B).

FIG. 5 illustrates a valve block apparatus 130 according to another implementation of the present application. The valve block apparatus 130 illustrated in fig. 5 differs from the valve block apparatus 130 of fig. 3A and 3B in that the pressure relief end T and the pressure balancing end T 'are merged into one end T, i.e., the pressure balancing end T' is omitted. This embodiment is suitable for the case where high pressure is not present at the pressure relief end T.

Fig. 6 and 7 illustrate yet another implementation according to the present application. The valve block arrangement 130 illustrated in fig. 6 and 7 differs from the valve block arrangement 130 in fig. 5 in that the stem 1332 of the spool of the pressure control valve 133 has a central bore H connected to the spring cavity of the spool. Thus, after hydraulic fluid enters the pressure control valve 133, it may enter the spring cavity of the spool along the central bore H inside the stem, releasing from the relief port T, as opposed to the block arrangement 130 in fig. 5, which releases hydraulic fluid from outside the pressure control valve 133.

Fig. 8 and 9 illustrate yet another implementation according to the present application. The valve block assembly 130 illustrated in fig. 8 and 9 differs from the valve block assembly 130 illustrated in fig. 6 and 7 in that a second restrictor 132 is disposed within the valve stem 1332 and is fluidly connected to the central bore H of the valve stem 1332. In this embodiment, after the input and output ends of the pressure control valve 133 are fluidly connected, a portion of the hydraulic fluid received at the input end b1 is discharged from the relief end T after passing through the first choke 131, the second choke 132 inside the spool, and the check valve 134. Such a design may enable a more compact configuration of valve block assembly 130 and hydraulic control system 100.

It should be understood that features and elements of the various embodiments of the valve block apparatus 130 described above may be omitted or combined as desired to form variations of the valve block apparatus 130.

The present application also provides a hydraulic apparatus equipped with the above-described valve block apparatus 130 or the hydraulic control system 100. Therefore, the above description is equally applicable to the hydraulic apparatus of the present application. The hydraulic device according to the present application is, for example, a loader, a forklift, an excavator, or the like.

As apparent from the above description, according to the valve block device of the present application, hydraulic logic control is achieved in a simplified structure by integrating a small number of elements together.

Moreover, according to the valve block device and the hydraulic control system of the application, the operation is easy, the reliability of the hydraulic control is improved, and the hydraulic control can be realized only by a small number of elements and the actuation among the elements, so that the instability or abnormal factors caused by the complex structure formed by a plurality of elements do not exist.

Moreover, the hydraulic control system according to the present application also reduces costs because hydraulic logic control can be achieved with a smaller number of components.

Moreover, the hydraulic control system according to the application is simple in structure and convenient to assemble to various hydraulic devices.

Furthermore, according to the aspect of the present application, the response characteristic of the pressure control valve can be adjusted, and thus the response characteristic of the block device and the hydraulic control system can be adjusted.

Other advantages and alternative embodiments of the present application will be apparent to those skilled in the art. Therefore, the application, in its broader aspects, is not limited to the specific details, the representative structures, and illustrative examples shown and described. On the contrary, various modifications and substitutions may be made by those skilled in the art without departing from the basic spirit and scope of the application.

Claims (15)

1. A valve block arrangement (130) for use in a hydraulic control system (100), the valve block arrangement (130) comprising:

an input (b1) configured to hydraulically couple with a first port (a1) of a pilot valve (120) of a hydraulic control system (100) and receive hydraulic fluid therefrom;

a control end (b2) configured to hydraulically couple with a second port (a2) of the pilot valve (120) and receive hydraulic fluid from the second port as a control signal;

an output (b11) configured to be hydraulically coupled with the input for outputting all or a portion of the hydraulic fluid received from the input; and

a relief end (T) configured to allow a portion of hydraulic fluid received at the input end (b1) to be released therefrom when hydraulic fluid is received at the control end (b 2).

2. The valve block assembly (130) of claim 1, wherein the valve block assembly (130) includes a first restrictor (131) and a pressure control valve (133);

one end of the first restrictor is hydraulically coupled with the input end of the valve block device, and the other end of the first restrictor is hydraulically coupled with the output end of the valve block device; and is

A pressure control valve (133) has an input port hydraulically coupled to the other end of the first restrictor, an output port hydraulically coupled to the pressure relief port, and a control port hydraulically coupled to a control port of the valve block arrangement.

3. The valve block assembly (130) of claim 2, wherein the valve block assembly (130) further comprises a check valve (134) connected between the output port of the pressure control valve and the pressure relief port such that hydraulic fluid can only flow from the output port to the pressure relief port.

4. The valve block arrangement (130) of claim 2, wherein the pressure control valve (133) has a communication state such that its input port is in fluid communication with the output port when the hydraulic pressure of the hydraulic fluid received at its control port reaches an activation value, such that a portion of the hydraulic fluid received at the input of the valve block arrangement is released from the relief port (T) via the pressure control valve.

5. The valve block assembly (130) of claim 2 or 3, wherein the valve block assembly (130) further comprises a second restrictor (132), one end of the second restrictor (132) being hydraulically coupled to the other end of the first restrictor, the other end being hydraulically coupled to the input port of the pressure control valve, and

the damping coefficient of the first and/or second restrictor is adjustable to adjust the proportion of hydraulic fluid received at the input of the valve block arrangement that is diverted between its output and its pressure relief.

6. The valve block assembly (130) of claim 5 wherein the spool of the pressure control valve includes a stem having a central bore and a spring attached to an axial end of the stem, the spring defining a spring chamber,

one end of the spring cavity is in fluid connection with the central hole cavity, and the other end of the spring cavity is in fluid connection with the pressure relief end; and is

The second restrictor is disposed within the valve stem and fluidly connected to the central bore.

7. The valve block assembly (130) of claim 2, wherein the valve block assembly (130) further comprises a pressure balancing port (T'), the spool of the pressure control valve comprising a stem and a spring connected at one axial end of the stem, the spring defining a spring chamber; and the spring chamber is in fluid connection with the pressure balancing port (T').

8. The valve block assembly (130) of claim 2, wherein the valve block assembly (130) further comprises a pressure balancing port (T'),

the valve core of the pressure control valve comprises a valve rod and a spring connected to one axial end part of the valve rod, the spring defines a spring cavity, and the valve rod is provided with a central hole cavity which is respectively connected with the spring cavity and the control end of the valve block device in a fluid mode;

the valve rod is provided with a first rod part and a second rod part along the axial direction, and the cross sectional area of the first rod part is smaller than that of the second rod part; and is

The pressure balance port (T ') is fluidly connected to a junction of the first and second stem portions such that during axial movement of the valve stem connected to the spring to connect or disconnect the input and output of the pressure control valve, hydraulic fluid flows from or into the pressure balance port (T') via the spring cavity.

9. The valve block assembly (130) of claim 7 or 8, wherein the pressure balancing port is adjustable in size or a throttle valve is provided in the flow path from the spring chamber to the pressure balancing port to adjust the operating characteristics of the pressure control valve.

10. The valve block assembly (130) of claim 2, wherein the stem of the valve cartridge of the pressure control valve has an annular groove in an axially central portion, and the pressure control valve has a communication state such that its input port is in fluid communication with the output port when the annular groove is in fluid communication with the input port of the valve block assembly.

11. The valve block assembly (130) of claim 2, wherein the spool of the pressure control valve includes a stem and a spring coupled to an axial end of the stem, the spring defining a spring cavity, the spring cavity fluidly coupled to the relief end.

12. A hydraulic control system (100), characterized in that the hydraulic control system (100) comprises:

a first hydraulic actuator (111) for performing a first operation;

a pilot valve (120) having a first port (a1) and a second port (a2) configured to control the flow of hydraulic fluid out of the first port (a1) and/or the second port (a 2);

the valve block arrangement (130) of any of claims 1-11, having an input (b1) hydraulically coupled to the first port (a1), a control (b2) hydraulically coupled to the second port (a2), an output (b11), and a pressure relief (T); and

a first master control valve (141) hydraulically coupled with the output (b11) and a first actuator (111), respectively, to control a first operation of the first actuator (111) based on a hydraulic signal of the hydraulic fluid output by the output (b 11).

13. The hydraulic control system (100) of claim 12, wherein the hydraulic control system (100) further comprises:

a second hydraulic actuator (112) for performing a second operation, the second operation constituting a compound action together with the first operation; and

a second master valve (142) hydraulically coupled to a pilot valve second port (a2) and a second hydraulic actuator (142), respectively, to control a second operation of the second hydraulic actuator (142) based on a hydraulic signal of the hydraulic fluid output from the second port (a 2).

14. The hydraulic control system (100) of claim 13, wherein one or more of the first operation, the second operation, and the compound action are regulated under logic control of the valve block arrangement (130).

15. A hydraulic device, characterized in that the hydraulic device is equipped with a valve block arrangement (130) according to any one of claims 1-11 or a hydraulic control system (100) according to any one of claims 12-14.

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