Hydraulic components, multi-way valves and engineering machinery

Abstract

The present invention discloses a hydraulic component, a multi-way valve and engineering machinery, wherein the hydraulic component comprises: a pressure oil port; a plurality of speed regulating valves, comprising a load connecting port connected to a corresponding load in a working state and a pressure oil connecting port connected to the pressure oil port in a working state; a feedback oil circuit, used for feeding back the pressure oil with the highest pressure among the pressure oils outputted from the plurality of load connecting ports in a working state; a plurality of pressure regulating valves, connected between the corresponding speed regulating valves and the pressure oil port, the pressure regulating valve comprising a plurality of hydraulic control ports and a pressure-stabilizing throttle hole, the plurality of hydraulic control ports comprising a first hydraulic control port, a second hydraulic control port, a third hydraulic control port and a fourth hydraulic control port; in a working state, the first hydraulic control port is connected to the feedback oil circuit, the second hydraulic control port is connected to the corresponding pressure oil connecting port, the third hydraulic control port is connected to the pressure oil port, and the fourth hydraulic control port is connected to the corresponding load connecting port.

Description

Technical Field

[0001] The invention relates to the field of hydraulic technology, and in particular to a hydraulic component, a multi-way valve and engineering machinery. Background Art

[0002] The multi-way valve is the control center of the entire hydraulic system and the core component of the hydraulic system. It is located between the pump and the load such as the actuator, and is used to control the size and direction of the hydraulic oil flow, thereby centrally controlling the movement direction and speed of the construction machinery actuator. The performance of the multi-way valve directly affects the controllability and comfort of the entire system. In the early days of construction machinery, throttling multi-way valves were widely used, mainly relying on oil inlet throttling to adjust the flow to the actuator, so the speed regulation characteristics were greatly affected by the load pressure. In some multi-way valves of the prior art, the flow of the actuator is only related to the stroke of the control valve stem, and the operator can control its compound action according to his own wishes to maintain the independence of the movement of each actuator. However, when the flow required by the load exceeds the maximum output flow of the pump, it is difficult for the multi-way valve to ensure that each actuator is diverted according to the valve core displacement ratio, and the flow is preferentially supplied to the actuator with lower load demand pressure, which is equivalent to throttling control, and the coordination of the whole machine is poor. Summary of the invention

[0003] The object of the present invention is to provide a hydraulic component with a simple structure and compact size. When using the hydraulic component, in the working state, no matter whether the pressure oil flow input by the pressure oil port is greater than the flow required by each load, the flow ratio allocated to each load is only the same as the ratio of the flow area of ​​the opening of the corresponding speed regulating valve. The present invention also provides a multi-way valve and engineering machinery using the hydraulic component.

[0004] A first aspect of the present invention discloses a hydraulic assembly for controlling the actions of multiple loads, having a working state, including:

[0005] Pressure oil port, used to input pressure oil;

[0006] A plurality of speed regulating valves, corresponding to the plurality of loads respectively, the speed regulating valves are used to adjust the flow of the pressure oil entering the corresponding loads, the speed regulating valves include a load connection port for connecting to the corresponding loads and a pressure oil connection port connected to the pressure oil port in a working state;

[0007] A feedback oil circuit, connected to the load connection ports of the plurality of speed regulating valves in a working state, and used for feeding back the pressure oil with the highest pressure among the pressure oils output from the plurality of load connection ports in a working state;

[0008] A plurality of pressure regulating valves correspond to the plurality of speed regulating valves one by one, respectively. The pressure regulating valves are connected between the corresponding speed regulating valves and the pressure oil port. The pressure regulating valves include a plurality of hydraulic control ports located at the end and a pressure-stabilizing throttle hole connected between the pressure oil connection port of the corresponding speed regulating valve and the pressure oil port. The plurality of hydraulic control ports include a first hydraulic control port, a second hydraulic control port, a third hydraulic control port and a fourth hydraulic control port located at the end of the pressure regulating valve for introducing pressure oil. In a working state, the first hydraulic control port is connected to the feedback oil circuit, the second hydraulic control port is connected to the pressure oil connection port of the corresponding speed regulating valve, the third hydraulic control port is connected to the pressure oil port, and the fourth hydraulic control port is connected to the load connection port of the corresponding speed regulating valve. The sum of the pressures of the first hydraulic control port and the second hydraulic control port is balanced with the sum of the pressures of the third hydraulic control port and the fourth hydraulic control port. The pressure-stabilizing throttle hole delivers pressure oil to the pressure oil connection port of the corresponding speed regulating valve.

[0009] In some embodiments, the throttle hole size of the pressure-stabilizing throttle hole is adjustable, and the speed regulating valve also includes an adjustable flow hole with adjustable throttle hole size connected between the load connection port and the pressure oil connection port in the working state, the first hydraulic control port and the second hydraulic control port are used to pass the pressure oil to increase the throttle hole of the pressure-stabilizing throttle hole, and the third hydraulic control port and the fourth hydraulic control port are used to pass the pressure oil to reduce the throttle hole of the pressure-stabilizing throttle hole.

[0010] In some embodiments, it also includes a plurality of one-way valves corresponding to the load connection ports of the plurality of speed regulating valves respectively, and the one-way valve is arranged between the feedback oil circuit and the corresponding speed regulating valve. In the working state, the oil inlet of the one-way valve is connected to the load connection port of the corresponding speed regulating valve, and the oil outlet of the one-way valve is connected to the feedback oil circuit.

[0011] In some embodiments, it also includes a unloading oil port for connecting to an oil tank, the speed regulating valve includes a three-position five-way proportional reversing valve, the speed regulating valve also includes an output oil port connected to the unloading oil port and a pressure feedback port connected to the oil inlet of the corresponding one-way valve and the fourth hydraulic control port of the corresponding pressure regulating valve, the load connection port includes a first load connection port and a second load connection port connected to different chambers of the load, the speed regulating valve has a first valve position, a second valve position and a third valve position, in the first valve position, the pressure oil connection port is simultaneously connected to the first load connection port and the pressure feedback port, the output oil port is connected to the second load connection port, in the second valve position, the pressure oil connection port is simultaneously connected to the second load connection port and the pressure feedback port, the output oil port is connected to the first load connection port, in the third valve position, the output oil port is connected to the pressure feedback port, the first load connection port, the second load connection port, the pressure feedback port and the pressure oil connection port are not connected.

[0012] In some embodiments, the pressure regulating valve is a two-position, two-way hydraulically controlled proportional valve, and the pressure regulating valve has a first regulating valve position and a second regulating valve position. In the first regulating valve position, the oil inlet and the oil outlet of the pressure regulating valve are connected, and in the second regulating valve position, the oil inlet and the oil outlet of the pressure regulating valve are not connected.

[0013] In some embodiments, it also includes an amplification oil circuit and a pressure reducing valve, the amplification oil circuit is connected to the first hydraulic control port, the oil inlet of the pressure reducing valve is connected to the pressure oil port, the oil outlet of the pressure reducing valve is connected to the amplification oil circuit, the pressure reducing valve includes a first hydraulic control end and a second hydraulic control end relative to each other, the first hydraulic control end is provided with an oil outlet hydraulic control port connected to the oil outlet of the pressure reducing valve, the second hydraulic control end is provided with a spring and a pressure reducing valve hydraulic control port connected to the feedback oil circuit, in the working state, the pressure of the pressure reducing valve hydraulic control port and the spring is then balanced with the pressure of the oil outlet hydraulic control port, and the feedback oil circuit is connected to the first hydraulic control port through the pressure reducing valve and the amplification oil circuit.

[0014] In some embodiments, a throttling hole is further provided between the hydraulic control port of the pressure reducing valve and the feedback oil circuit, and a throttling hole is further provided between the oil outlet hydraulic control port and the oil outlet of the pressure reducing valve.

[0015] In some embodiments, it also includes a unloading oil port for connecting to the oil tank and a flow stabilizing component connected between the amplifying oil circuit and the unloading oil port, the flow stabilizing component includes a flow stabilizing throttle hole connected to the amplifying oil circuit and a pressure compensating valve connected between the flow stabilizing throttle hole and the unloading oil port, the pressure compensating valve includes a main valve body maintained in a long-open state and a third hydraulic control end and a fourth hydraulic control end relative to each other, the third hydraulic control end is provided with a spring and a hydraulic control port connected to the oil inlet of the main valve body, and the fourth hydraulic control end is provided with a hydraulic control port connected to the oil inlet of the flow stabilizing throttle hole.

[0016] In some embodiments, it also includes a two-position two-way hydraulically controlled on-off valve connected between the pressure oil port and the unloading oil port, one hydraulically controlled end of the two-position two-way hydraulically controlled on-off valve is provided with a spring and a hydraulically controlled port connected to the amplification oil circuit, and the other hydraulically controlled end is provided with a hydraulically controlled port connected to the pressure oil port. The two-position two-way hydraulically controlled on-off valve has a connected state and a disconnected state. In the working state, the two-position two-way hydraulically controlled on-off valve is in a disconnected state.

[0017] A second aspect of the present invention discloses a multi-way valve, comprising any one of the hydraulic components described above.

[0018] A third aspect of the present invention discloses an engineering machine, comprising any one of the hydraulic components described above.

[0019] Based on the hydraulic component provided by the present invention, by setting a pressure regulating valve, a speed regulating valve and a feedback oil circuit, in the working state, when the pressure oil flow input by the pressure oil port is greater than the sum of the flow rates required by each load, the ratio of the pressure oil flow rates delivered to each load by each speed regulating valve is the same as the ratio of the opening area size of the corresponding speed regulating valve; when the pressure oil flow rate input by the pressure oil port is reduced to less than the sum of the flow rates required by each load, the pressure oil flow rate distributed to each load is also reduced in the same proportion, and the operation of each load is more coordinated and orderly; at the same time, since the pressure regulating valve is arranged between the pressure oil port and the speed regulating valve, compared with the arrangement in which the pressure regulating valve is arranged between the speed regulating valve and the load, the structure and oil circuit of the hydraulic component are greatly simplified, and the hydraulic component is more compact.

[0020] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic diagram of the structural principle of a hydraulic assembly according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A partial enlarged schematic diagram of the A1 portion of the hydraulic assembly shown;

[0024] Figure 3 for Figure 1 A partially enlarged schematic diagram of part A2 of the hydraulic component shown. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0027] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] like Figures 1 to 3 As shown, the hydraulic assembly of this embodiment is used to control the action of multiple loads. The loads include various actuators such as hydraulic cylinders and hydraulic motors. The hydraulic assembly has a working state, in which the hydraulic assembly controls multiple loads to act simultaneously. The hydraulic assembly includes a pressure oil port, multiple speed regulating valves 10, a feedback oil circuit Lc and multiple pressure regulating valves 20.

[0030] like Figure 1 In the A2 and A3 parts of the structural principle diagram, the pressure oil port of the hydraulic component is used to input pressure oil, and the pressure oil port is connected to a hydraulic oil output device such as a hydraulic pump, and is used to deliver pressure oil to each load in the working state to drive each load to move. In the embodiment shown in the figure, the pressure oil port includes a first pressure oil port P1 and a second pressure oil port P2.

[0031] The plurality of speed regulating valves 10 correspond to the plurality of loads one by one, that is, each load is connected to a corresponding speed regulating valve 10, and the speed regulating valve 10 is used to adjust the flow of the pressure oil entering the corresponding load. The speed regulating valve 10 includes a load connection port for connecting to the corresponding load in the working state and a pressure oil connection port a4 connected to the pressure oil port. In the working state, the speed regulating valve 10 receives the pressure oil from the pressure oil port through the pressure oil connection port a4, and outputs it to the corresponding load through the load connection port to drive the load.

[0032] The feedback oil circuit Lc is connected to the load connection ports of multiple speed control valves 10 in the working state. The feedback oil circuit Lc is used to feedback the pressure oil with the highest pressure among the pressure oils output from the multiple load connection ports in the working state, that is, the feedback oil circuit Lc is used to output the pressure oil with the maximum load pressure. In the embodiment shown in the figure, the feedback oil circuit Lc is a hydraulic pipeline connected to the load connection ports of multiple speed control valves 10 at the same time.

[0033] The multiple pressure regulating valves 20 correspond to the multiple speed regulating valves 10 one by one, respectively. The pressure regulating valves 20 are connected between the corresponding speed regulating valves 10 and the pressure oil port. The pressure regulating valves 20 include multiple hydraulic control ports located at the end and a pressure-stabilizing throttle hole connected between the pressure oil connection port a4 of the corresponding speed regulating valve 10 and the pressure oil port. The multiple hydraulic control ports include a first hydraulic control port b1, a second hydraulic control port b2, a third hydraulic control port b3 and a fourth hydraulic control port b4 located at the end of the pressure regulating valve 20 for introducing pressure oil. In the working state, the first hydraulic control port b1 is connected to the feedback oil circuit Lc, the second hydraulic control port b2 is connected to the pressure oil connection port a4 of the corresponding speed control valve 10, the third hydraulic control port b3 is connected to the pressure oil port, and the fourth hydraulic control port b4 is connected to the load connection port of the corresponding speed control valve 10. The sum of the pressures of the first hydraulic control port b1 and the second hydraulic control port b2 is balanced with the sum of the pressures of the third hydraulic control port b3 and the fourth hydraulic control port b4, and the pressure-stabilizing throttle hole delivers pressure oil to the pressure oil connection port a4 of the corresponding speed control valve 10.

[0034] Assume that the pressure of the first hydraulic control port b1 is Px, the pressure of the second hydraulic control port b2 is Py, the pressure of the third hydraulic control port b3 is Pz, and the pressure of the fourth hydraulic control port b4 is Pw. In the working state, the sum of the pressures of the first hydraulic control port b1 and the second hydraulic control port b2 is balanced with the sum of the pressures of the third hydraulic control port b3 and the fourth hydraulic control port b4, that is, Px+Py=Pz+Pw, then Pw-Py=Pz-Px, that is, the pressure difference of the pressure oil of the pressure oil connection port and the load connection port of the speed control valve 10 corresponding to each load is equal, and depends on the pressure oil port The pressure of the input pressure oil and the pressure of the pressure oil in the feedback oil circuit, so that when the flow areas of the speed regulating valves of each load are equal, the flow rates of the pressure oil delivered to each load by each speed regulating valve are equal. When the pressure oil flow rate input by the pressure oil port is greater than the sum of the flow rates required by each load, the ratio of the pressure oil flow rates delivered by each speed regulating valve to each load is related to the ratio of the flow areas of the corresponding speed regulating valve 10. When the pressure oil flow rate input by the pressure oil port is reduced to less than the sum of the flow rates required by each load, the pressure oil flow rate distributed to each load is reduced in the same proportion, and the work of each load is more coordinated and orderly. When the pressure regulating valve 20 is arranged downstream of the speed regulating valve 10, in order to achieve that the pressure oil flow rate input by the pressure oil port is less than the pressure oil flow rate distributed to each load is reduced in the same proportion, and the work of each load is more coordinated and orderly, the structure and oil circuit of the hydraulic assembly will be bloated and complicated. In this embodiment, the pressure regulating valve 20 is arranged between the pressure oil port and the speed regulating valve 10, that is, it is located upstream of the speed regulating valve 10, and the structure and oil circuit of the hydraulic assembly are greatly simplified, and the hydraulic assembly is more compact.

[0035] In order to stably and reliably achieve coordinated operation of various loads through the speed control valve 10, in some embodiments, the throttle hole size of the pressure-stabilizing throttle hole is adjustable, and the speed control valve 10 also includes an adjustable flow hole with adjustable throttle hole size connected between the load connection port and the pressure oil connection port in the working state, the first hydraulic control port b1 and the second hydraulic control port b2 are used to pass pressure oil to increase the throttle hole of the pressure-stabilizing throttle hole, and the third hydraulic control port b3 and the fourth hydraulic control port b4 are used to pass pressure oil to reduce the throttle hole of the pressure-stabilizing throttle hole.

[0036] In order to realize that the feedback oil circuit Lc can accurately and timely feedback the load of the oil circuit, in some embodiments, such as Figure 1 As shown, the hydraulic assembly also includes a plurality of one-way valves 30 corresponding to the load connection ports of the plurality of speed regulating valves 10, respectively. The one-way valves 30 are arranged between the feedback oil circuit Lc and the corresponding speed regulating valves 10. In the working state, the oil inlet of the one-way valve 30 is connected to the load connection port of the corresponding speed regulating valve 10, and the oil outlet of the one-way valve 30 is connected to the feedback oil circuit Lc. In this embodiment, in the working state, the feedback oil circuit Lc is connected to the corresponding speed regulating valve Lc through each one-way valve 30, and the pressure oil with the largest pressure among the pressure oils output from each load connection port can enter the feedback oil circuit Lc through the corresponding one-way valve, and the pressure oil with the largest pressure simultaneously closes the other one-way valves 30 connected to the feedback oil circuit Lc, thereby conveniently and reliably realizing the feedback of the pressure oil of the maximum load pressure by the feedback oil circuit Lc.

[0037] In some embodiments, the hydraulic assembly further includes a relief oil port for connecting to the oil tank. In the embodiment shown in the figure, the relief oil port includes a first relief oil port T1 and a second relief oil port T2. The speed regulating valve 10 includes a three-position five-way proportional reversing valve, and the speed regulating valve 10 also includes an output oil port a5 connected to the relief oil port and a pressure feedback port a2 connected to the corresponding oil inlet of the one-way valve 30 and the corresponding fourth hydraulic control port b4 of the pressure regulating valve 20. The load connection port includes a first load connection port a1 and a second load connection port a3 connected to different chambers of the load (for example, if the load is a single-rod telescopic hydraulic cylinder, the first load connection port a1 and the second load connection port a3 are respectively connected to the rod chamber and the rodless chamber of the hydraulic cylinder). The speed regulating valve 10 has a first valve position, a second valve position and a third valve position. In the first valve position, the pressure oil connection port a4 is connected to the first load connection port a1 and the pressure feedback port a2 at the same time. In the embodiment shown in the figure, the pressure oil connection port a4 is connected to the first load connection port a1 through a throttle hole, and the output oil port a5 is connected to the second load connection port a3. In the second valve position, the pressure oil connection port a4 is connected to the second load connection port a3 and the pressure feedback port a2 at the same time. In the embodiment shown in the figure, the pressure oil connection port a4 is connected to the second load connection port a3 through a throttle hole, and the output oil port a5 is connected to the first load connection port a1. In the third valve position, the output oil port a5 is connected to the pressure feedback port a2, and the first load connection port a1, the second load connection port a3, the pressure feedback port a2 and the pressure oil connection port a4 are not connected. In the embodiment shown in the figure, the speed regulating valve 10 is a hydraulic proportional reversing valve. In some embodiments not shown in the figure, the speed regulating valve 10 can also be an electromagnetic proportional reversing valve.

[0038] In some embodiments, the pressure regulating valve 20 is a two-position two-way hydraulically controlled proportional valve, and the pressure regulating valve 20 has a first regulating valve position and a second regulating valve position. In the first regulating valve position, the oil inlet and the oil outlet of the pressure regulating valve 20 are connected, and in the second regulating valve position, the oil inlet and the oil outlet of the pressure regulating valve 20 are not connected.

[0039] In order to make the load pressure more sensitively fed back to the hydraulic control port of the pressure regulating valve 20, in some embodiments, as Figure 1 and Figure 2As shown, the hydraulic component also includes an amplification oil circuit Ls and a pressure reducing valve 40. The amplification oil circuit Ls is connected to the first hydraulic control port b1, the oil inlet of the pressure reducing valve 40 is connected to the pressure oil port, and the oil outlet of the pressure reducing valve 40 is connected to the amplification oil circuit Ls. The pressure reducing valve 40 includes a first hydraulic control end and a second hydraulic control end relative to each other. The first hydraulic control end is provided with an oil outlet hydraulic control port c2 connected to the oil outlet of the pressure reducing valve 40, and the second hydraulic control end is provided with a spring and a pressure reducing valve hydraulic control port c1 connected to the feedback oil circuit Lc. Through this arrangement, the pressure of the pressure oil on the amplification oil circuit Ls can be equal to the pressure of the pressure oil on the feedback oil circuit Lc plus the pressure of the spring next to the pressure reducing valve hydraulic control port c1. In the working state, the pressure of the pressure reducing valve hydraulic control port c1 and the spring is then balanced with the pressure of the oil outlet hydraulic control port c2, and the feedback oil circuit Lc is connected to the first hydraulic control port b1 through the pressure reducing valve 40 and the amplification oil circuit Ls. The connection between the feedback oil circuit Lc and the first hydraulic control port b1 in this embodiment is an indirect connection between the feedback oil circuit Lc and the first hydraulic control port b1 after passing through the pressure reducing valve 40 and the amplifying oil circuit Ls. Through this setting, the pressure transmitted to the first hydraulic control port b1 by the feedback oil circuit can be amplified to make the feedback more sensitive.

[0040] In order to make the pressure of the pressure oil outputted by the pressure reducing valve 40 to the amplifying oil circuit Ls more stable, in some embodiments, as shown in the figure, a throttle hole is further provided between the pressure reducing valve hydraulic control port c1 and the feedback oil circuit Lc, and a throttle hole is further provided between the oil outlet hydraulic control port c2 and the oil outlet of the pressure reducing valve 40. By providing the throttle hole, when a short-term large fluctuation occurs in the feedback oil circuit, the throttle hole can stabilize the oil pressure.

[0041] like Figure 1 In the A4 part of the structural principle diagram in the embodiment, in order to make the oil pressure of the pressure oil of the amplification oil circuit Ls more stable, reduce the large fluctuation in a short time, and make the feedback to the hydraulic control port of the pressure regulating valve more stable, such as Figure 1 As shown, the hydraulic assembly also includes a discharge oil port for connecting to the oil tank and a flow stabilizing assembly connected between the amplifying oil circuit Ls and the discharge oil port. The flow stabilizing assembly includes a flow stabilizing throttle hole 60 connected to the amplifying oil circuit Ls and a pressure compensating valve 50 connected between the flow stabilizing throttle hole 60 and the discharge oil port. The pressure compensating valve 50 includes a main valve body that maintains a long open state and a third hydraulic control end and a fourth hydraulic control end that are opposite to each other. The third hydraulic control end and the fourth hydraulic control end are two hydraulic control ends located at opposite ends of the main valve body. The third hydraulic control end is provided with a spring and a hydraulic control port connected to the oil inlet of the main valve body, and the fourth hydraulic control end is provided with a hydraulic control port connected to the oil inlet of the flow stabilizing throttle hole 60. The flow stabilizing throttle hole 60 is a throttle hole with a small flow area. Through this arrangement, the pressure difference at both ends of the flow stabilizing throttle hole 60 can be kept stable. The flow stabilizing throttle hole 60 stably outputs a small flow of pressure oil, so that the amplifying oil circuit Ls always has an oil leakage channel, which helps to avoid blockage and large pressure fluctuations in the amplifying oil circuit Ls.

[0042] In order to enable the pressure oil inputted from the pressure oil port to work and drain adaptively when the load is working or not working, in some embodiments, as Figure 1 and Figure 2 As shown, the hydraulic assembly also includes a two-position two-way hydraulically controlled on-off valve 70 connected between the pressure oil port and the unloading oil port. A spring and a hydraulically controlled port connected to the amplification oil circuit Ls are provided on one hydraulically controlled end of the two-position two-way hydraulically controlled on-off valve 70, and a hydraulically controlled port connected to the pressure oil port is provided on the other hydraulically controlled end. The two-position two-way hydraulically controlled on-off valve 70 has a connected state and a disconnected state. In the working state, the two-position two-way hydraulically controlled on-off valve 70 is in a disconnected state. When the load is working, the two-position two-way hydraulically controlled on-off valve 70 is in a disconnected state, and the pressure oil of the pressure oil port is delivered to the load. When the load is not working, the two-position two-way hydraulically controlled on-off valve 70 is in a connected state, and the pressure oil of the pressure oil port is output to the unloading oil port for oil discharge.

[0043] In some implementations such as Figure 1 As shown, a multi-way valve is also disclosed, comprising any one of the above-mentioned hydraulic components, that is, the above-mentioned hydraulic components are integrated into a multi-way valve.

[0044] In some embodiments, a construction machine is also disclosed, comprising any of the above-mentioned hydraulic components.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A hydraulic assembly for controlling the movement of multiple loads, having a working state, characterized in that: include: Pressure oil port, used to input pressure oil; A plurality of speed regulating valves, corresponding to the plurality of loads respectively, the speed regulating valves are used to adjust the flow of the pressure oil entering the corresponding loads, the speed regulating valves include a load connection port for connecting to the corresponding load in a working state and a pressure oil connection port connected to the pressure oil port in a working state; A feedback oil circuit, connected to the load connection ports of the plurality of speed regulating valves in a working state, and used for feeding back the pressure oil with the highest pressure among the pressure oils output from the plurality of load connection ports in a working state; A plurality of pressure regulating valves correspond to the plurality of speed regulating valves one by one, respectively. The pressure regulating valves are connected between the corresponding speed regulating valves and the pressure oil port. The pressure regulating valves include a plurality of hydraulic control ports located at the end and a pressure-stabilizing throttle hole connected between the pressure oil connection port of the corresponding speed regulating valve and the pressure oil port. The plurality of hydraulic control ports include a first hydraulic control port, a second hydraulic control port, a third hydraulic control port and a fourth hydraulic control port located at the end of the pressure regulating valve for introducing pressure oil. In a working state, the first hydraulic control port is connected to the feedback oil circuit, the second hydraulic control port is connected to the pressure oil connection port of the corresponding speed regulating valve, the third hydraulic control port is connected to the pressure oil port, and the fourth hydraulic control port is connected to the load connection port of the corresponding speed regulating valve. The sum of the pressures of the first hydraulic control port and the second hydraulic control port is balanced with the sum of the pressures of the third hydraulic control port and the fourth hydraulic control port. The pressure-stabilizing throttle hole delivers pressure oil to the pressure oil connection port of the corresponding speed regulating valve.

2. The hydraulic assembly according to claim 1, characterized in that: The throttle hole size of the pressure-stabilizing throttle hole is adjustable, and the speed regulating valve also includes an adjustable flow hole with adjustable throttle hole size connected between the load connecting port and the pressure oil connecting port in the working state. The first hydraulic control port and the second hydraulic control port are used to pass the pressure oil to increase the throttle hole of the pressure-stabilizing throttle hole, and the third hydraulic control port and the fourth hydraulic control port are used to pass the pressure oil to reduce the throttle hole of the pressure-stabilizing throttle hole.

3. The hydraulic assembly according to claim 1, characterized in that: It also includes a plurality of one-way valves corresponding to the load connection ports of the plurality of speed regulating valves respectively, wherein the one-way valve is arranged between the feedback oil circuit and the corresponding speed regulating valve, and in a working state, the oil inlet of the one-way valve is connected to the load connection port of the corresponding speed regulating valve, and the oil outlet of the one-way valve is connected to the feedback oil circuit.

4. The hydraulic assembly according to claim 3, characterized in that: It also includes a relief oil port for connecting to an oil tank, the speed regulating valve includes a three-position five-way proportional reversing valve, the speed regulating valve also includes an output oil port connected to the relief oil port and a pressure feedback port connected to the oil inlet of the corresponding one-way valve and the fourth hydraulic control port of the corresponding pressure regulating valve, the load connection port includes a first load connection port and a second load connection port connected to different chambers of the load, the speed regulating valve has a first valve position, a second valve position and a third valve position, in the first valve position, the pressure oil connection port is simultaneously connected to the first load connection port and the pressure feedback port, the output oil port is connected to the second load connection port, in the second valve position, the pressure oil connection port is simultaneously connected to the second load connection port and the pressure feedback port, the output oil port is connected to the first load connection port, in the third valve position, the output oil port is connected to the pressure feedback port, the first load connection port, the second load connection port, the pressure feedback port and the pressure oil connection port are not connected.

5. The hydraulic assembly according to claim 1, characterized in that: The pressure regulating valve is a two-position two-way hydraulically controlled proportional valve, and has a first regulating valve position and a second regulating valve position. In the first regulating valve position, the oil inlet and the oil outlet of the pressure regulating valve are connected, and in the second regulating valve position, the oil inlet and the oil outlet of the pressure regulating valve are not connected.

6. The hydraulic assembly according to claim 1, characterized in that: It also includes an amplification oil circuit and a pressure reducing valve, the amplification oil circuit is connected to the first hydraulic control port, the oil inlet of the pressure reducing valve is connected to the pressure oil port, the oil outlet of the pressure reducing valve is connected to the amplification oil circuit, the pressure reducing valve includes a first hydraulic control end and a second hydraulic control end opposite to each other, the first hydraulic control end is provided with an oil outlet hydraulic control port connected to the oil outlet of the pressure reducing valve, the second hydraulic control end is provided with a spring and a pressure reducing valve hydraulic control port connected to the feedback oil circuit, in the working state, the pressure of the pressure reducing valve hydraulic control port and the spring is then balanced with the pressure of the oil outlet hydraulic control port, and the feedback oil circuit is connected to the first hydraulic control port through the pressure reducing valve and the amplification oil circuit.

7. The hydraulic assembly according to claim 6, characterized in that A throttling hole is also provided between the hydraulic control port of the pressure reducing valve and the feedback oil circuit, and a throttling hole is also provided between the oil outlet hydraulic control port and the oil outlet of the pressure reducing valve.

8. The hydraulic assembly according to claim 6, characterized in that: It also includes a unloading oil port for connecting to the oil tank and a flow stabilizing component connected between the amplifying oil circuit and the unloading oil port, the flow stabilizing component includes a flow stabilizing throttle hole connected to the amplifying oil circuit and a pressure compensating valve connected between the flow stabilizing throttle hole and the unloading oil port, the pressure compensating valve includes a main valve body maintained in a long-open state and a third hydraulic control end and a fourth hydraulic control end relative to each other, the third hydraulic control end is provided with a spring and a hydraulic control port connected to the oil inlet of the main valve body, and the fourth hydraulic control end is provided with a hydraulic control port connected to the oil inlet of the flow stabilizing throttle hole.

9. The hydraulic assembly according to claim 8, characterized in that It also includes a two-position two-way hydraulically controlled on-off valve connected between the pressure oil port and the unloading oil port, one hydraulically controlled end of the two-position two-way hydraulically controlled on-off valve is provided with a spring and a hydraulically controlled port connected to the amplification oil circuit, and the other hydraulically controlled end is provided with a hydraulically controlled port connected to the pressure oil port. The two-position two-way hydraulically controlled on-off valve has a connected state and a disconnected state. In the working state, the two-position two-way hydraulically controlled on-off valve is in a disconnected state.

10. A multi-way valve, characterized in that: Comprising a hydraulic assembly as claimed in any one of claims 1 to 9.

11. An engineering machine, characterized in that: Comprising a hydraulic assembly as claimed in any one of claims 1 to 9.

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