Hydraulic control system, valve block device thereof, and hydraulic equipment

Abstract

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

Description

Technical Field

[0001] This application generally relates to hydraulic control, and more specifically, to a valve block device used in a hydraulic control system, a hydraulic control system including the valve block device, and a hydraulic device. Background Technology

[0002] Hydraulic control systems are widely used in various mechanical equipment due to their advantages such as small size, light weight, sensitive action, and ability to frequently start and reverse.

[0003] In existing hydraulic control schemes, multiple control components such as check valves, solenoid valves, and relief valves are often used to control hydraulic actuators. Existing schemes suffer from problems such as a large number of components, complex structure, and low reliability.

[0004] Therefore, further improvements are needed to the existing hydraulic control system. Summary of the Invention

[0005] The purpose of this application is to provide a hydraulic control solution that is simple in structure, efficient and reliable.

[0006] Therefore, according to one aspect of this application, a valve block device for use in a hydraulic control system is provided, comprising: an input end configured to be hydraulically coupled to a first port of a pilot valve of the hydraulic control system and to receive hydraulic fluid from the first port; a control end configured to be hydraulically coupled to a second port of the pilot valve and to receive hydraulic fluid as a control signal from the second port; an output end configured to be hydraulically coupled to the input end for outputting all or part of the hydraulic fluid received from the input end; and a pressure relief end configured to allow a portion of the hydraulic fluid received at the input end to be released from the pressure relief end when the control end receives hydraulic fluid.

[0007] According to one feasible embodiment, the valve block device includes a first throttle and a pressure control valve; one end of the first throttle is hydraulically coupled to the input end of the valve block device, and the other end is hydraulically coupled to the output end of the valve block device; and the pressure control valve has an input port, an output port and a control port, the input port being hydraulically coupled to the other end of the first throttle, the output port being hydraulically coupled to the pressure relief end, and the control port being hydraulically coupled to the control end of the valve block device.

[0008] According to one feasible implementation, the valve block device further includes a one-way valve connected between the output port of the pressure control valve and the pressure relief end, so that hydraulic fluid can only flow from the output port to the pressure relief end.

[0009] According to one feasible implementation, the pressure control valve has a connected state in which its input port and output port are fluidly connected when the hydraulic pressure of the hydraulic fluid received at its control port reaches a start value, so that a portion of the hydraulic fluid received at the input end of the valve block assembly is released from the pressure relief end via the pressure control valve.

[0010] According to one feasible embodiment, the valve block device further includes a second throttle, one end of which is hydraulically coupled to the other end of the first throttle and the other end of which is hydraulically coupled to the input port of the pressure control valve, and the damping coefficient of the first throttle and / or the second throttle is adjustable to adjust the ratio between the hydraulic fluid received at the input end of the valve block device and its output end and its pressure relief end.

[0011] According to one feasible embodiment, the valve core of the pressure control valve includes a valve stem having a central cavity and a spring connected to one axial end of the valve stem, the spring defining a spring cavity, one end of the spring cavity being fluidly connected to the central cavity and the other end being fluidly connected to the pressure relief end; and the second throttle is disposed inside the valve stem and fluidly connected to the central cavity.

[0012] According to one feasible embodiment, the valve block device further includes a pressure balancing port, the valve core of the pressure control valve includes a valve stem and a spring connected to one axial end of the valve stem, the spring defining a spring cavity; and the spring cavity is fluidly connected to the pressure balancing port.

[0013] According to one feasible embodiment, the valve block assembly further includes a pressure balancing port. The valve core of the pressure control valve includes a valve stem and a spring connected to one axial end of the valve stem. The spring defines a spring cavity. The valve stem has a central cavity that is fluidly connected to the spring cavity and the control end of the valve block assembly, respectively. The valve stem has a first rod portion and a second rod portion along the axial direction, the cross-sectional area of ​​the first rod portion being smaller than the cross-sectional area of ​​the second rod portion. The pressure balancing port is fluidly connected to the connection between the first rod portion and the second rod portion, such that during axial movement of the valve stem connected to the spring to connect or disconnect the input and output ends of the pressure control valve, hydraulic fluid flows out of the pressure balancing port or into the spring cavity via the spring cavity.

[0014] According to one feasible implementation, the size of the pressure balancing port is adjustable, or a throttling valve is provided in the flow path from the spring chamber to the pressure balancing port, thereby adjusting the operating characteristics of the pressure control valve.

[0015] According to one feasible embodiment, the valve stem of the valve core of the pressure control valve has an annular groove in the middle of the axial direction, and the pressure control valve has a communication state in which its input port and output port are in fluid communication when the annular groove is in fluid communication with the input port of the valve block device.

[0016] According to one feasible embodiment, the valve core of the pressure control valve includes a valve stem and a spring connected to one axial end of the valve stem, the spring defining a spring cavity that is fluidly connected to the pressure relief end.

[0017] According to another aspect of this application, a hydraulic control system is provided, comprising: 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 from the first port and / or the second port; a valve block assembly as described above, having an input terminal hydraulically coupled to the first port, a control terminal hydraulically coupled to the second port, an output terminal, and a pressure relief terminal; and a first master control valve hydraulically coupled to the output terminal and the first actuator respectively, to control the first operation of the first actuator based on a hydraulic signal of the hydraulic fluid output from the output terminal.

[0018] According to one feasible implementation, the hydraulic control system further includes: a second hydraulic actuator for performing a second operation, the second operation together with the first operation constituting a compound action; and a second main control valve, hydraulically coupled to a second port of a pilot valve and the second hydraulic actuator respectively, to control the second operation of the second hydraulic actuator based on a hydraulic signal of the hydraulic fluid output from the second port.

[0019] According to one feasible implementation, one or more of the first operation, the second operation, and the combined action are regulated under the logical control of the valve block device.

[0020] According to another aspect of this application, a hydraulic device is provided, which is equipped with the valve block device or the hydraulic control system described above.

[0021] Therefore, according to the technical solution of this application, hydraulic logic control is achieved with a simplified structure by integrating a small number of components into a single valve block device. Furthermore, the technical solution of this application simplifies operation and improves the reliability of hydraulic control, as hydraulic control can be achieved using only a small number of components and their interactions, eliminating the instability or abnormalities caused by complex structures composed of numerous components. Moreover, the technical solution of this application also reduces costs, as hydraulic logic control can be achieved using only a limited number of components. Attached Figure Description

[0022] Figure 1This is a schematic block diagram of a hydraulic control system according to a feasible embodiment of this application.

[0023] Figure 2 yes Figure 1 Hydraulic circuit diagram of valve block device in hydraulic control system.

[0024] Figure 3A and Figure 3B yes Figure 2 Cross-sectional views of the valve block assembly in two states.

[0025] Figure 4 yes Figure 2 A cross-sectional view of another implementation of the valve block device.

[0026] Figure 5 yes Figure 2 A hydraulic circuit diagram of another implementation of the valve block device in the circuit.

[0027] Figure 6 yes Figure 2 A hydraulic circuit diagram of another implementation of the valve block device in the circuit.

[0028] Figure 7 yes Figure 6 A cross-sectional view of the valve block assembly.

[0029] Figure 8 yes Figure 2 A hydraulic circuit diagram of another implementation of the valve block device in the circuit.

[0030] Figure 9 yes Figure 8 A cross-sectional view of the valve block assembly. Detailed Implementation

[0031] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0032] Figure 1 The illustration schematically shows a hydraulic control system 100 according to a feasible embodiment of this application, which mainly includes: a hydraulic actuator 110, a pilot valve 120, a valve block assembly 130, and a main control valve unit 140. The various parts of the hydraulic control system 100 are described in detail below.

[0033] See Figure 1The hydraulic actuator 110 includes two hydraulic actuators: a first hydraulic actuator 111 and a second hydraulic actuator 112. The first hydraulic actuator 111 performs a first operation, such as linear or rotary motion. The second hydraulic actuator 112 performs a second operation, such as linear or rotary motion. The first operation performed by the first hydraulic actuator 111 and the second operation performed by the second hydraulic actuator 112 can together constitute a compound action of a machine (e.g., a hydraulic device equipped with a hydraulic control system 100).

[0034] Understandable, although Figure 1 The diagram shows a hydraulic actuator 110 comprising two actuators. The hydraulic actuator 110 may be implemented to include other numbers of hydraulic actuators, for example, only one or more than two, depending on the specific application. In the case where the hydraulic actuator 110 includes two or more hydraulic actuators, some or all of these hydraulic actuators actuate together to achieve compound actions of the hydraulic equipment.

[0035] In one embodiment, the first hydraulic actuator 111 can be implemented as a hydraulic cylinder or a motor. The second hydraulic actuator 112 can be implemented as a hydraulic cylinder or a motor. Figure 1 In this embodiment, the second hydraulic actuator 112 is implemented as two hydraulic cylinders 112A and 112B connected in parallel. It should be understood that the first hydraulic actuator 111 and the second hydraulic actuator 112 can be configured in a suitable manner according to the specific application, and are not limited thereto.

[0036] Pilot valve 120 includes multiple ports for controlling the flow of hydraulic fluid (e.g., hydraulic oil) as pilot fluid from one or more of the multiple ports, such that the hydraulic fluid flowing from different ports flows into corresponding flow paths of hydraulic control system 100. Pilot valve 120 can be implemented as an operating handle, and the operator can control which one or more ports of the pilot valve the pilot fluid flows from by adjusting the direction of the operating handle.

[0037] See Figure 1 The pilot valve 120 has a first port a1, a second port a2, a third port a3, and a fourth port a4 for hydraulic fluid to flow out, and a port P coupled to a hydraulic fluid source (not shown). The pilot valve 120 receives hydraulic fluid from the hydraulic fluid source through port P and controls the hydraulic fluid to flow out from one or more of the first to fourth ports.

[0038] The main control valve unit 140 is used to control the hydraulic actuator unit 110. See also... Figure 1The 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 main control valve 141 are hydraulically coupled to the output end b11 of the valve block assembly 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 to the oil inlet of the hydraulic cylinder of the first hydraulic actuator. Thus, the first main control valve 141 controls the operation of the first hydraulic actuator 111 based on the hydraulic signal of the hydraulic fluid output from the output end b11 of the valve block assembly. The input ports c2 and c3 of the second main control valve 142 are hydraulically connected to the second ports a2 and a3 of the pilot valve 120, respectively. The output ports A2 and B2 of the second main control valve 142 are hydraulically connected to the oil inlet of the hydraulic cylinder of the second hydraulic actuator. Thus, the second main control valve 142 controls the operation of the second hydraulic actuator 112 based on the hydraulic signal of the hydraulic fluid output from the pilot valve.

[0039] The valve block device 130 has a hydraulic logic control function, which uses hydraulic pressure (e.g., the static or dynamic pressure of hydraulic oil) as a control signal to control the pressure input of an input port c1 of the main valve unit, thereby controlling the operation of the hydraulic actuator 110.

[0040] See Figure 2 The valve block assembly 130 has an input end b1, an output end b11, a control end b2, a pressure relief end T, and a pressure balance end T'. The valve block assembly 130 can be implemented as including a first throttle 131, a second throttle 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 can be implemented as a spool valve or other valve core structure capable of performing the above functions.

[0041] See Figure 1 and Figure 2The input end b1 of the valve block device 130 is hydraulically coupled to the first port a1 of the pilot valve 120 to receive hydraulic fluid from the first port a1. The control end b2 of the valve block device 130 is hydraulically coupled to the second port a2 of the pilot valve 120 to receive hydraulic fluid from the second port a2. The hydraulic signal of the hydraulic fluid received at the control end b2 serves as the control signal for the valve block device 130. The output end b11 of the valve block device 130 is hydraulically connected to the input end c1 of the first master control valve 141. One end of the first throttle 131 is connected to the input end b1, and the other end is connected to the output end b11. One end of the second throttle 132 is connected to the other end of the first throttle, i.e., the other end of the first throttle, one end of the second throttle, and the output end b11 are fluidly connected. The other end of the second throttle is connected to the input port of the pressure control valve 133. The control port of the pressure control valve 133 is connected to the control end b2 of the valve block device 130. A one-way valve 134 is connected between the output port of the pressure control valve 133 and the pressure relief end T, so that hydraulic fluid can only flow from the output port to the pressure relief end T.

[0042] See Figure 3A and Figure 3B The valve core of the pressure control valve 133 comprises a valve plug 1331, a valve stem 1332, and a spring 1333 connected sequentially in the axial direction. The spring 1333 is connected to one axial end of the valve stem 1332 and defines a spring chamber. This spring chamber is hydraulically connected to the pressure balance port T' of the valve block assembly 130. The pressure balance port T' can be connected to a tank (not shown). The valve stem 1332, connected to the spring 1333, moves axially to compress the spring 1333, thereby fluidly connecting the input and output ports of the pressure control valve 133, allowing hydraulic fluid to flow through the check valve 134 and to the pressure relief end T. During this process, hydraulic fluid in the spring chamber flows out from the pressure balance port T'. The spring 1333 returns to its original position, and the valve stem 1332, connected to the spring 1333, moves axially, thereby disconnecting the input and output ports of the pressure control valve. During this process, hydraulic fluid flows back from the pressure balance port T' to the spring chamber.

[0043] See also Figure 3A and Figure 3B In one embodiment, the valve stem has an annular groove S in the middle. When the valve stem 1332 is moved so that the annular groove S is in fluid communication with the input end b1 of the valve block device 130, the input port and output port of the pressure control valve 133 are connected, and the pressure control valve is in the connected state (see...). Figure 3A When the annular groove S is not in fluid communication with the input end b1, there is no fluid communication between the input and output ends of the pressure control valve 133, and the pressure control valve is in the open state (see...). Figure 3BDuring the movement of valve stem 1332, if high pressure exists at the pressure relief end T, an additional port, namely the pressure balance port T', can be used to maintain a lower pressure within the spring chamber, thereby ensuring smooth movement of the valve stem. In this way, even with high pressure at the pressure relief end T, the pressure control valve 133 can still be connected.

[0044] When the hydraulic pressure of the hydraulic fluid received at its control port reaches the activation value, the pressure control valve 133 connects its input and output ports, allowing a portion of the hydraulic fluid received at the input end b1 of the valve block assembly 130 to be released from the pressure relief end T via the pressure control valve 133. Specifically, with the input and output ports of the pressure control valve 133 connected, a portion of the hydraulic fluid received at the output end b1 of the valve block assembly 130 flows out from the output end b11 via the first throttle 131, while the other portion flows out from the pressure relief end T sequentially via the first throttle 131, the second throttle 132, the pressure control valve 133, the input and output ends, and the check valve 134. Thus, the hydraulic fluid received at the output end b1 of the valve block assembly 130 is diverted, and the hydraulic signal (hydraulic pressure) of the hydraulic fluid output from the output end b11 is altered due to this diversion, thereby changing the first operation of the first actuator.

[0045] In one embodiment, the proportion of hydraulic fluid received at the output end b1 of the valve block assembly 130 can be adjusted by changing the throttling coefficient of one or both of the first throttling device 131 and the second throttling device 132 (e.g., changing the throttling orifice diameter and / or throttling length). That is, the proportion of hydraulic fluid received at the output end b1 of the valve block assembly 130 flowing out from the output end b11 and the pressure relief end T, respectively. For example, the first throttling device 131 and the second throttling device 132 can each be implemented as a throttling valve. The damping coefficient (throttling coefficient) of the throttling valve for the fluid passing through it can be changed by adjusting the throttling area and / or throttling length of the valve.

[0046] In one embodiment, the size of the pressure balance port T' is adjustable, thereby regulating the rate at which hydraulic fluid flows into or out of the pressure balance port T'. This, in turn, adjusts the operating characteristics of the pressure control valve 133, for example, whether the pressure control valve 133 quickly becomes open or closed, or slowly becomes open or closed. In another embodiment, a throttle valve (not shown) can be provided in the flow path connected to the pressure balance port T', thereby regulating the rate at which hydraulic fluid flows into or out of the pressure balance port T'. This, in turn, adjusts the operating characteristics of the pressure control valve 133.

[0047] See Figure 2The check valve 134 can be implemented as including a valve ball or valve spool and a spring connected to the valve ball or valve spool. The valve ball or valve 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 pressure relief end T. The check valve 134 can be configured to open when the control end b2 of the valve block assembly 130 receives hydraulic fluid from the pilot valve. That is, both the check valve 134 and the pressure control valve 133 of the valve block assembly 130 are controlled by the hydraulic signal from their control ends b2.

[0048] See below. Figure 1 Figure 3 illustrates the working process of the valve block device 130.

[0049] First, by operating the pilot valve 120, hydraulic fluid flows only from the first port a1 of the pilot valve 120 to the first input port b1 of the valve block assembly 130. For example, a constant flow rate of hydraulic fluid can be supplied to the input port b1. At this time, the pressure control valve 133 is in the open state (e.g., the state shown in FIG. 3B), that is, the control terminal b2 of the pressure control valve 133 does not receive a hydraulic signal (hydraulic signal of hydraulic fluid) as a control signal, so there is no fluid communication between its input and output terminals, and the hydraulic pressure at the input port b1 and the output port b11 is equal. The hydraulic fluid is transmitted to the first master control valve 141 (e.g., port c1 of the first master control valve 141) via the flow path b1-b11, thereby opening the first master control valve 141. Then, the hydraulic fluid enters the inlet of the first hydraulic actuator 111 via the first master control valve 141, thereby actuating the first operation of the first hydraulic actuator 111.

[0050] Next, by operating the pilot valve 120, hydraulic fluid flows out from the second port a2 of the pilot valve 120 to the control end b2 of the valve block assembly 130. The pressure control valve 133 and the check valve 134 are both activated under the control of the hydraulic signal at the control end b2. At this time, the hydraulic fluid received from the input end b1, in addition to entering the first main valve 141 via flow path b1-b11, also bypasses the pressure control valve 133 and is discharged from the pressure relief end T. That is, the hydraulic fluid flowing in from the input end b1 has two flow paths: one flow path is from the input end b1 through the first throttle 131 to the output end b11, and the other flow path is from the input end b1 through the first throttle 131, the second throttle 132, the input and output ends of the pressure control valve 133, and the check valve 134 in sequence, and is discharged from the pressure relief end T.

[0051] Therefore, once the control terminal b2 of the valve block device 130 receives hydraulic fluid (hydraulic signal), it triggers the bypass conduction of flow path b1-b11, which diverts the flow and thus regulates the hydraulic signal (hydraulic pressure) transmitted to the first hydraulic actuator 111. Furthermore, it can regulate the first operation of the first hydraulic actuator 111, and also indirectly regulate the composite operation consisting of the first and second operations.

[0052] It is understandable that, although the above description shows an implementation where hydraulic fluid is supplied to input terminal b1 first and then to control terminal b2, the reverse—supplying hydraulic fluid to control terminal b2 first and then to input terminal b1—is also possible. In the implementation where hydraulic fluid is supplied to control terminal b2 first and then to input terminal b1, the hydraulic signal is first transmitted to the second hydraulic actuator 142 to actuate the second operation, and at this time, both pressure control valve 133 and check valve 134 are in the open state. Once hydraulic fluid is supplied to input terminal b1, hydraulic fluid will flow through flow path b1-b11 and its bypass simultaneously. This implementation can also achieve the same adjustment and control effects and functions as described above.

[0053] Understandable. Figure 1 The illustrated valve block device 130 can be implemented without the second throttle 132, that is, when the bypass is open, the hydraulic fluid enters directly into the input port of the pressure control valve 133 after being throttled by the first throttle 131.

[0054] Understandable. Figure 1 The illustrated valve block assembly 130 can be implemented without the check valve 134, meaning that when the bypass is open, hydraulic fluid is discharged directly from the pressure relief end T via the output port of the pressure control valve 133. This is suitable for scenarios where there is no pressure surge (or high pressure) at the pressure relief end T.

[0055] The valve block device 130 can be implemented in various ways. See below for details. Figures 4-9 Let's introduce other implementations of the valve block device 130.

[0056] Figure 4 A valve block device 130 according to another implementation of this application is shown. Figure 4 The valve block assembly 130 illustrated in the figure and Figure 1 The difference in the valve block assembly 130 is that the valve stem 1332 of the pressure control valve 133 has a stepped structure, that is, the valve stem includes a first stem portion A with a smaller cross-section and a second stem portion B with a larger cross-section. Furthermore, the pressure balance end T' is connected to the connection point C between the first stem portion A and the second stem portion B, instead of... Figure 3A and 3BThe valve block device 130 is connected to one end of the spring cavity of the valve core. Figure 4 The valve block assembly 130 illustrated in the figure and Figure 3A and 3B The valve block device 130 in the middle is different in that the central part of the valve stem 1332 has a central through hole H, which is hydraulically connected to the spring cavity of the valve core and the control end b2. This makes the pressure acting on the larger cross-section B and the smaller cross-section A of the valve stem 1332 equal. When the two areas are not equal, the pressure on the smaller cross-section first stem A and the larger cross-section second stem B is different. The pressure acting on the area difference between the larger cross-section and the smaller cross-section can be used to overcome the elastic force of the spring 1333, thereby making the input port and output port of the pressure control valve 133 fluidly connected.

[0057] In this implementation, during the axial movement of the valve stem 1332 to achieve fluid communication between the input and output ports of the pressure control valve 133, the pressure difference acting between the larger and smaller cross-sections overcomes the spring force of the valve core 1333 and releases hydraulic fluid from the pressure balance end T', thereby achieving fluid communication between the input and output ends of the pressure control valve 133. This implementation is particularly suitable for scenarios where the spring cavity of the valve core cannot be connected to the pressure balance end T', because in this implementation, the pressure balance end T' does not need to be connected to the spring cavity at one axial end of the valve stem 1332, but can be connected to the middle part of the valve stem (the connection point C between the first stem portion A and the second stem portion B).

[0058] Figure 5 A valve block device 130 according to another implementation of this application is shown. Figure 5 The valve block assembly 130 illustrated in the figure and Figure 3A and 3B The difference in the valve block device 130 is that the pressure relief end T and the pressure balance end T' are combined into a single end T, that is, the pressure balance end T' is omitted. This embodiment is suitable for situations where there is no high pressure at the pressure relief end T.

[0059] Figure 6 and Figure 7 Another implementation according to this application is shown. Figure 6 and 7 The valve block assembly 130 illustrated in the figure and Figure 5 The difference in the valve block assembly 130 is that the valve stem 1332 of the pressure control valve 133 has a central bore H connected to the spring cavity of the valve core. Thus, after hydraulic fluid enters the pressure control valve 133, it can enter the spring cavity of the valve core along the central bore H inside the valve stem and be released from the pressure relief end T, unlike... Figure 5Hydraulic fluid is released from outside the pressure control valve 133, as in the valve block device 130.

[0060] Figure 8 and Figure 9 Another implementation according to this application is shown. Figure 8 and 9 The valve block assembly 130 illustrated in the figure and Figure 6 and Figure 7 The valve block assembly 130 illustrated differs in that a second throttle 132 is disposed inside the valve stem 1332 and fluidly connected to the central cavity 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 pressure relief end T via the first throttle 131, the second throttle 132 inside the valve core, and the check valve 134. This design allows for a more compact structure of the valve block assembly 130 and the hydraulic control system 100.

[0061] It should be understood that features and elements in the various embodiments of the valve block device 130 described above may be omitted or combined as needed to form variations of the valve block device 130.

[0062] This application also provides a hydraulic device equipped with the aforementioned valve block device 130 or hydraulic control system 100. Therefore, the above description also applies to the hydraulic device of this application. Examples of hydraulic devices according to this application include loaders, forklifts, and excavators.

[0063] As can be seen from the above description, the valve block device according to this application achieves hydraulic logic control with a simplified structure by integrating a small number of components together.

[0064] Moreover, the valve block device and hydraulic control system according to this application are easy to operate and improve the reliability of hydraulic control, because hydraulic control can be achieved by relying on only a small number of components and their interaction, and there are no unstable or abnormal factors caused by the complex structure composed of many components.

[0065] Moreover, the hydraulic control system according to this application also reduces costs because hydraulic logic control can be achieved using only a small number of components.

[0066] Moreover, the hydraulic control system according to this application has a simple structure and is easy to assemble into various hydraulic equipment.

[0067] Furthermore, according to the technical solution of this application, the response characteristics of the pressure control valve can be adjusted, thereby adjusting the response characteristics of the valve block device and the hydraulic control system.

[0068] Other advantages and alternative embodiments of this application will be apparent to those skilled in the art. Therefore, this application is not, in its broader sense, limited to the specific details, representative structures, and exemplary embodiments shown and described. Rather, those skilled in the art can make various modifications and substitutions without departing from the basic spirit and scope of this application.

Claims

1. A valve block device (130) for use in a hydraulic control system (100), characterized in that, The valve block device (130) has: The input terminal (b1) is configured to be hydraulically coupled to the first port (a1) of the pilot valve (120) of the hydraulic control system (100) and to receive hydraulic fluid from the first port; The control terminal (b2) is configured to be hydraulically coupled to the second port (a2) of the pilot valve (120) and to receive hydraulic fluid as a control signal from the second port; The output terminal (b11) is configured to be hydraulically coupled to the input terminal for outputting all or part of the hydraulic fluid received from the input terminal; as well as A pressure relief terminal (T) is configured to allow a portion of the hydraulic fluid received at the input terminal (b1) to be released from the pressure relief terminal when hydraulic fluid is received at the control terminal (b2). The valve block device (130) includes a first throttle (131) and a pressure control valve (133); one end of the first throttle is hydraulically coupled to the input end of the valve block device, and the other end is hydraulically coupled to the output end of the valve block device; the pressure control valve (133) has an input port, an output port, and a control port, the input port being hydraulically coupled to the other end of the first throttle, the output port being hydraulically coupled to the pressure relief end, and the control port being hydraulically coupled to the control end of the valve block device. The valve block assembly (130) further includes a pressure balance port (T'), and the valve core of the pressure control valve includes a valve stem and a spring connected to one axial end of the valve stem, the spring defining a spring cavity; and: 1) The spring cavity is fluidly connected to the pressure balance port (T'); or, 2) The valve stem has a central cavity that is fluidly connected to the control end of the spring cavity and the valve block device, respectively; the valve stem has a first rod portion and a second rod portion along the axial direction, the cross-sectional area of ​​the first rod portion being smaller than the cross-sectional area of ​​the second rod portion; and the pressure balance port (T') is fluidly connected to the connection between the first rod portion and the second rod portion, so that when the valve stem connected to the spring moves axially to connect or disconnect the input and output ends of the pressure control valve, hydraulic fluid flows out of the pressure balance port (T') or into the spring cavity via the spring cavity.

2. The valve block device (130) as claimed in claim 1, characterized in that, The valve block device (130) also includes a one-way valve (134) connected between the output port of the pressure control valve and the pressure relief end, so that hydraulic fluid can only flow from the output port to the pressure relief end.

3. The valve block device (130) as described in claim 1, characterized in that, The pressure control valve (133) has a connected state that allows its input port to be fluidly connected to its output port when the hydraulic pressure of the hydraulic fluid received at its control port reaches the start value, so that a portion of the hydraulic fluid received at the input end of the valve block device is released from the pressure relief end (T) via the pressure control valve.

4. The valve block device (130) as claimed in claim 1, characterized in that, The valve block device (130) further includes a second throttle (132), one end of which is hydraulically coupled to the other end of the first throttle, and the other end is hydraulically coupled to the input port of the pressure control valve. The damping coefficients of the first throttle and / or the second throttle are adjustable to adjust the ratio between the hydraulic fluid received at the input end of the valve block assembly and its output end and its relief end.

5. The valve block device (130) as described in claim 4, characterized in that, The pressure control valve's valve core includes a valve stem with a central cavity and a spring connected to one axial end of the valve stem, the spring defining a spring cavity. One end of the spring cavity is fluidly connected to the central cavity, and the other end is fluidly connected to the pressure relief end; and The second throttle is disposed inside the valve stem and is fluidly connected to the central orifice.

6. The valve block device (130) as claimed in claim 1, characterized in that, The size of the pressure balance port is adjustable, or a throttling valve is provided in the flow path from the spring chamber to the pressure balance port, thereby adjusting the operating characteristics of the pressure control valve.

7. The valve block device (130) as claimed in claim 1, characterized in that, The valve stem of the pressure control valve core has an annular groove in the middle of its axial direction, and the pressure control valve has a communication state in which its input port and output port are in fluid communication when the annular groove is in fluid communication with the input port of the valve block device.

8. The valve block device (130) as claimed in claim 1, characterized in that, The pressure control valve core includes a valve stem and a spring connected to one axial end of the valve stem, the spring defining a spring cavity that is fluidly connected to the pressure relief end.

9. A hydraulic control system (100), characterized in that, The hydraulic control system (100) includes: A first hydraulic actuator (111) is used to perform a first operation; A pilot valve (120) having a first port (a1) and a second port (a2) is configured to control the flow of hydraulic fluid from the first port (a1) and / or the second port (a2); The valve block device (130) as described in any one of claims 1-8 has an input terminal (b1) hydraulically coupled to the first port (a1), a control terminal (b2) hydraulically coupled to the second port (a2), an output terminal (b11), and a pressure relief terminal (T); and The first master control valve (141) is hydraulically coupled to the output terminal (b11) and the first hydraulic actuator (111) respectively, so as to control the first operation of the first hydraulic actuator (111) based on the hydraulic signal of the hydraulic fluid output from the output terminal (b11).

10. The hydraulic control system (100) as described in claim 9, characterized in that, The hydraulic control system (100) also includes: A second hydraulic actuator (112) is used to perform a second operation, which together with the first operation constitutes a compound action; and The second master control valve (142) is hydraulically coupled to the second port (a2) of the pilot valve and the second hydraulic actuator (112), respectively, to control the hydraulic signal based on the hydraulic fluid output from the second port (a2). The second operation of controlling the second hydraulic actuator (112).

11. The hydraulic control system (100) as described in claim 10, characterized in that, One or more of the first operation, the second operation, and the combined action are regulated under the logic control of the valve block device (130).

12. A hydraulic device, characterized in that, The hydraulic equipment is equipped with a valve block device (130) as described in any one of claims 1-8 or a hydraulic control system (100) as described in any one of claims 9-11.

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