CN112833061A - Control valve assembly for construction machinery and construction machinery having the same - Google Patents
Control valve assembly for construction machinery and construction machinery having the same Download PDFInfo
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- CN112833061A CN112833061A CN202110207870.6A CN202110207870A CN112833061A CN 112833061 A CN112833061 A CN 112833061A CN 202110207870 A CN202110207870 A CN 202110207870A CN 112833061 A CN112833061 A CN 112833061A
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- 238000010276 construction Methods 0.000 title claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 31
- 230000007547 defect Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 188
- 239000010720 hydraulic oil Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Multiple-Way Valves (AREA)
Abstract
本发明提供了一种工程机械的控制阀组件及具有其的工程机械，其中控制阀组件包括第一控制阀，包括第一阀体和第一阀芯，第一阀体上设置有进油口、排油口、第一工作油口和第二工作油口，第一阀芯上设置有进油连通槽和排油连通槽；第一节流结构，设置在第一阀芯的外部，第一节流结构与进油口或者排油口连通；第二节流结构，第一节流结构与进油口连通时，第二节流结构设置在排油连通槽上，第二节流结构与排油口连通时，第二节流结构设置在进油连通槽上。本发明的技术方案解决了现有技术中的工程机械的控制阀的控制灵活性差的缺陷。
The invention provides a control valve assembly for construction machinery and construction machinery having the same, wherein the control valve assembly includes a first control valve, a first valve body and a first valve core, and an oil inlet is provided on the first valve body , an oil discharge port, a first working oil port and a second working oil port, the first valve core is provided with an oil inlet communication groove and an oil discharge communication groove; the first throttle structure is arranged outside the first valve core, the third The throttling structure is communicated with the oil inlet or the oil discharge port; the second throttling structure, when the first throttling structure is communicated with the oil inlet, the second throttling structure is arranged on the oil discharge communication groove, and the second throttling structure is When communicating with the oil discharge port, the second throttle structure is arranged on the oil inlet communication groove. The technical solution of the present invention solves the defect of poor control flexibility of the control valve of the construction machinery in the prior art.
Description
Technical Field
The invention relates to the technical field of excavator equipment, in particular to a control valve assembly of engineering machinery and the engineering machinery with the control valve assembly.
Background
At present, the transmission of the engineering machinery is mostly driven by hydraulic pressure, wherein the hydraulic excavator realizes excavation and unloading through single or compound actions of a movable arm, an arm, a bucket and rotation. An operator operates the pilot handle in the cab to switch the main valve spool, and in the switching process of the main valve spool, hydraulic oil pumped out from the pump is supplied to the working device through the oil inlet opening of the spool, and meanwhile, the hydraulic oil is discharged to the oil tank from the working device through the oil return opening of the spool. The valve core is provided with various open slots, different open slots can form different open areas with the valve body in the movement process, so that the flow entering the working device can be controlled, and the action speed of the excavator can be controlled.
In the prior art, an oil inlet opening groove and an oil return opening groove of a traditional valve core are simultaneously arranged on one main valve core and are rigidly connected. When the pilot pressure pushes the valve core, the oil inlet opening and the oil return opening are changed synchronously after the valve core moves, and the opening areas of the oil inlet and the oil return opening of the valve core cannot be changed in any combination mode, so that the control flexibility of the control valve is poor.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor control flexibility of the control valve of the construction machine in the prior art, so as to provide a control valve assembly of the construction machine and the construction machine with the same.
In order to solve the above problems, the present invention provides a control valve assembly of a construction machine, including; the first control valve comprises a first valve body and a first valve core, wherein an oil inlet, an oil discharge port, a first working oil port and a second working oil port are formed in the first valve body, the first working oil port and the second working oil port are suitable for being connected with a control oil cylinder of engineering machinery, an oil inlet communicating groove and an oil discharge communicating groove are formed in the first valve core, the oil inlet communicating groove is suitable for communicating the oil inlet with one of the first working oil port and the second working oil port, and the oil discharge communicating groove is suitable for communicating the oil discharge port with the other of the first working oil port and the second working oil port; the first throttling structure is arranged outside the first valve core and communicated with the oil inlet or the oil outlet; and when the second throttling structure is communicated with the oil outlet, the second throttling structure is arranged on the oil inlet communicating groove.
Optionally, the control valve assembly further includes a second control valve, the second control valve includes a second valve body and a second valve core, a third working oil port and a fourth working oil port are provided on the second valve body, the third working oil port is communicated with the oil inlet or the oil discharge port, an overflow groove is provided on the second valve core, the overflow groove is communicated with the third working oil port and the fourth working oil port, and the first throttling structure is a first throttling groove provided on the overflow groove.
Optionally, the third working oil port is communicated with the oil inlet, and the fourth working oil port is communicated with the main oil way.
Optionally, a one-way circulation structure is arranged between the third working oil port and the oil inlet.
Optionally, the first valve body and the second valve body are of unitary construction.
Optionally, the first valve body and the second valve body are connected by an external pipe.
Alternatively, the second throttling structure is a second throttling groove provided on the oil drain communication groove.
Optionally, the oil extraction intercommunication groove is two, and two oil extraction intercommunication grooves set up respectively in the both sides of oil feed intercommunication groove, all are provided with the second throttle groove on two oil extraction intercommunication grooves.
Optionally, the first control valve and/or the second control valve is an electrically controlled directional valve.
The invention also provides engineering machinery comprising the control valve assembly of the engineering machinery.
The invention has the following advantages:
by utilizing the technical scheme of the invention, the oil inlet (or oil discharge) throttling amount of the first control valve can be adjusted through the first throttling structure. By adjusting the position of the first valve spool in the first valve body, the oil discharge (or oil feed) throttling amount of the first control valve can be adjusted by the second throttling structure. Therefore, the structure can independently adjust the oil inlet throttling quantity and the oil discharge throttling quantity of the first control valve, and the first control valve and the second control valve are combined at will, so that the control flexibility of the control valve assembly is greatly improved. Therefore, the technical scheme of the invention overcomes the defect of poor control flexibility of the control valve of the engineering machinery in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 illustrates a schematic cross-sectional view of a control valve assembly of a work machine of the present disclosure; and
fig. 2 shows a schematic diagram of the control valve assembly of fig. 1.
Description of reference numerals:
10. a first control valve; 11. a first valve body; 111. an oil inlet; 112. an oil discharge port; 113. a first working oil port; 114. a second working oil port; 12. a first valve spool; 13. an oil inlet communicating groove; 14. an oil discharge communicating groove; 20. a first throttling arrangement; 30. a second throttling arrangement; 40. a second control valve; 41. a second valve body; 411. a third working oil port; 412. a fourth working oil port; 42. a second valve core; 43. a flow through groove; 50. a one-way flow structure; 100. and controlling the oil cylinder.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and 2, the control valve assembly of the construction machine of the present embodiment includes a first control valve 10, a first throttling structure 20, and a second throttling structure 30. Wherein the first control valve 10 comprises a first valve body 11 and a first valve spool 12. The first valve body is provided with an oil inlet 111, an oil discharge port 112, a first working oil port 113 and a second working oil port 114, and the first working oil port 113 and the second working oil port 114 are suitable for being connected with a control cylinder 100 of the engineering machine. The first valve spool 12 is provided with an oil inlet communicating groove 13 and an oil discharge communicating groove 14, the oil inlet communicating groove 13 is adapted to communicate the oil inlet 111 with one of the first working oil port 113 and the second working oil port 114, and the oil discharge communicating groove 14 is adapted to communicate the oil discharge port 112 with the other of the first working oil port 113 and the second working oil port 114. The first throttling structure 20 is provided outside the first control valve 10, and the first throttling structure 20 communicates with the oil inlet 111 or the oil discharge port 112. The second throttling structure 30 is arranged in the following manner: when the first throttling structure is communicated with the oil inlet 111, the second throttling structure 30 is provided on the oil drain communication groove 14. When the second throttling structure 30 communicates with the oil drain port 112, the second throttling structure 30 is provided on the oil-intake communication groove 13.
With the technical solution of the present embodiment, through the first throttling structure 20, the oil inlet (or oil discharge) throttling amount of the first control valve 10 can be adjusted. By adjusting the position of the first spool 12 in the first valve body 11, the amount of oil discharge (or oil intake) restriction of the first control valve 10 can be adjusted by the second restriction structure 30. Therefore, the structure can independently adjust the oil inlet throttling quantity and the oil outlet throttling quantity of the first control valve 10, and can be combined randomly, so that the control flexibility of the control valve component is greatly improved. Therefore, the technical scheme of the embodiment overcomes the defect of poor control flexibility of the control valve of the engineering machine in the prior art.
It should be noted that the connection of the first working oil port 113 and the second working oil port 114 with the control oil cylinder 100 of the engineering machine means that the control oil cylinder 100 includes a rodless cavity and a rod cavity, one of the first working oil port 113 and the second working oil port 114 is communicated with the rodless cavity, and the other is communicated with the rod cavity, so as to control the extension and retraction of the control oil cylinder 100. In the present embodiment, as can be seen from fig. 1 and 2, the first working port 113 is communicated with the rodless chamber of the control cylinder 100, and the second working port 114 is communicated with the rod chamber of the control cylinder 100.
It should be noted that the meaning of the above-mentioned "the oil inlet communicating groove 13 is adapted to communicate the oil inlet 111 with one of the first working oil port 113 and the second working oil port 114, and the oil discharge communicating groove 14 is adapted to communicate the oil discharge port 112 with the other of the first working oil port 113 and the second working oil port 114" is as follows: as can be seen from fig. 2, the first control valve 10 is a reversing valve, so the first spool 12 has different gear positions in the first valve body 11. The oil inlet communicating groove 13 and the oil discharge communicating groove 14 function to change a communication state between the oil inlet 111, the oil discharge port 112, the first working oil port 113, and the second working oil port 114 when the first spool 12 is in different shift positions. As can be seen from fig. 2, when the first valve spool 12 is in the left position, the oil inlet communicating groove 13 communicates the oil inlet 111 with the first working oil port 113, and the oil discharge communicating groove 14 communicates the oil discharge port 112 with the second working oil port 114, at this time, the rodless cavity of the control cylinder 100 is filled with oil, and the rod cavity is filled with oil, so that the piston rod is extended. When the first valve core 12 is in the right position, the oil inlet communicating groove 13 communicates the oil inlet 111 with the second working oil port 114, and the oil discharge communicating groove 14 communicates the oil discharge port 112 with the first working oil port 113, so that the rod cavity oil and the rodless cavity oil of the control oil cylinder 100 return at the time, and the piston rod retracts.
It should be noted that the first throttling structure 20 is disposed outside the first valve spool 12, which means that the first throttling structure 20 is not disposed on the first valve spool 12, that is, the first throttling structure 20 can independently perform a throttling control function with respect to the second throttling structure 30. Specifically, the first throttling structure 20 may be disposed at the oil inlet 111 or the oil outlet 112 of the first valve body 11, or the first throttling structure 20 is disposed outside the first control valve 10 and is communicated with the oil inlet 111 or the oil outlet 112 of the first valve body 11 through a pipeline, a channel, or the like.
The first throttle structure 20 and the second throttle structure 30 are provided in two ways. First, the first throttling structure 20 is communicated with the oil inlet 111, and at this time, the second throttling structure is disposed on the oil drain communicating groove 14. It will be understood by those skilled in the art that when the first throttling structure 20 is communicated with the oil inlet 111, the oil inlet flow rate of the first control valve 10 is regulated by the first throttling structure 20, and when the second throttling structure is provided on the oil discharge communicating groove 14, the oil discharge flow rate of the first control valve 10 is regulated by the second throttling structure 30. Alternatively, the first throttle structure 20 is communicated with the oil drain port 112, and in this case, the second throttle structure is provided on the oil-inlet communication groove 13. It will be understood by those skilled in the art that when the first throttling structure 20 is communicated with the oil drain port 112, the oil drain flow rate of the first control valve 10 is regulated by the first throttling structure 20, and when the second throttling structure is provided on the oil-inlet communicating groove 13, the oil inlet flow rate of the first control valve 10 is regulated by the second throttling structure 30. Above-mentioned two kinds of mode of setting can all play the oil feed flow and the oil extraction flow to first control valve 10 and carry out the technological effect of independent regulation.
As shown in fig. 1 and 2, the control valve assembly further includes a second control valve 40. The second control valve 40 includes a second valve body 41 and a second valve spool 42, a third working oil port 411 and a fourth working oil port 412 are provided on the second valve body 41, and the third working oil port 411 is communicated with the oil inlet 111 or the oil discharge port 112. The second valve core 42 is provided with a flow passing groove 43, the flow passing groove 43 is communicated with the third working oil port 411 and the fourth working oil port 412, and the first throttling structure 20 is a first throttling groove arranged on the flow passing groove 43. Specifically, as can be seen from fig. 2, the second control valve 40 is a directional control valve, and when the position of the second valve body 41 of the second valve body 42 is changed, the first throttling groove can change the flow area between the third working port 411 and the fourth working port 412, thereby achieving the throttling effect. When the third working oil port 411 is communicated with the oil inlet 111, the second control valve 40 has a throttling effect on the oil inlet flow of the first control valve 10. When the third working port 411 communicates with the oil discharge port 112, the second control valve 40 has a throttling effect on the oil discharge flow rate of the first control valve 10.
It should be noted that the first throttling structure 20 is not limited to the throttling groove structure provided on the valve core, and those skilled in the art can understand that the first throttling structure 20 can be any mechanism capable of throttling the fluid in the pipeline in the prior art, such as a valve, a throttling valve, and the like.
As shown in fig. 1, in the solution of the present embodiment, the third working oil port 411 is communicated with the oil inlet 111, and the fourth working oil port 412 is communicated with the main oil passage. Specifically, before entering the first control valve 10, the hydraulic oil in the main oil path enters the second control valve 40, and is throttled by the action of the first throttling structure 20, so as to realize the function of adjusting the oil inlet flow of the first control valve 10. Of course, as will be understood by those skilled in the art from the above description, the third working oil port 411 may also communicate with the oil discharge port 112. At this time, the oil discharged from the first control valve 10 passes through the second control valve 40, and returns to the external oil tank through the throttling function of the first throttling structure 20, thereby realizing the function of adjusting the oil discharge flow of the first control valve 10.
As shown in fig. 1 and fig. 2, in the technical solution of the present embodiment, a one-way flow structure 50 is disposed between the third working oil port 411 and the oil inlet 111. Specifically, in the second control valve 40, the hydraulic oil flows from the fourth working port 412 to the third working port 411, so the one-way flow structure 50 is configured to allow the hydraulic oil to flow in one direction from the third working port 411 to the oil inlet 111, thereby preventing the hydraulic oil from flowing back. Of course. As will be understood by those skilled in the art, when the third working port 411 is communicated with the oil discharge port 112, the hydraulic oil flows from the third working port 411 to the fourth working port 412, and therefore the one-way flow structure 50 is configured to allow the hydraulic oil to flow in one direction from the oil discharge port 112 to the third working port 411.
As shown in fig. 1, in the present embodiment, the first valve body 11 and the second valve body 41 are integrally formed. Specifically, in the present embodiment, the first valve body 11 and the second valve body 41 are connected integrally to form an integral valve body structure. The upper half space of the valve body is provided with the relevant structure and control port of the first control valve 10, and the lower half space of the valve body is provided with the relevant structure and control port of the second control valve 40. As can be seen from fig. 1, the oil inlet 111 of the first valve body 11 and the third working oil port 411 of the second valve body 41 are communicated through a pipeline.
The above-mentioned "the first valve element 11 and the second valve element 41 are integrally formed" includes both the case where they are integrally (cast) molded and the case where they are connected together by a plurality of parts by means of a fastener, an adhesive, welding, or the like.
Of course, the arrangement of the first valve body 11 and the second valve body 41 is not limited to the above, and for example, the first valve body 11 and the second valve body 41 are connected by an external pipe. In this embodiment, which is not shown, the first valve body 11 and the second valve body 41 are of a split structure, i.e., the first control valve 10 and the second control valve 40 are independently provided. When the second control valve 40 needs to throttle the oil inlet flow of the first control valve 10, the third working oil port 411 is communicated with the oil inlet 111 through a pipeline. When the second control valve 40 needs to throttle the oil discharge flow of the first control valve 10, the third working port 411 is communicated with the oil discharge port 112 through a pipeline.
As shown in fig. 1, in the solution of the present embodiment, the second throttle structure 30 is a second throttle groove provided in the oil drain communication groove 14. Specifically, when the position of the first valve body 12 in the first valve body 11 is changed, the second throttle groove can change the oil return opening area of the drain communication groove 14, and further adjust the oil return flow rate.
As shown in fig. 1, in the technical solution of this embodiment, there are two oil drainage communication grooves 14, two oil drainage communication grooves 14 are respectively disposed on two sides of the oil inlet communication groove 13, and both the two oil drainage communication grooves 14 are provided with a second throttling groove. Specifically, the two drain communication grooves 14 are used to communicate the first working port 113 with the drain port 112 and the second working port 114 with the drain port 112, respectively, when the first spool 12 is in different shift positions. Of course, it will be understood by those skilled in the art that when the second throttling structure 30 (i.e., the second throttling groove) is provided on the oil-intake communication groove 13, neither of the oil-discharge communication grooves 14 is provided with the second throttling structure 30.
As shown in fig. 1 and 2, in the solution of the present embodiment, the first control valve 10 and the second control valve 40 are electrically controlled directional valves. Specifically, in the present embodiment, the first control valve 10 is a three-position, four-way selector valve. The left position and the right position of the first control valve 10 are working positions (already described above and not described herein), and the middle position is a cut-off position. The second control valve 40 is a two-position two-way reversing valve, and as can be seen from fig. 2, when the second control valve 40 is in the left position, the first throttling structure 20 does not play a throttling role, and when the second control valve 40 is in the right position, the first throttling structure 20 plays a throttling role for oil inlet (or oil return). The electric control ends of the first control valve 10 and the second control valve 40 are controlled by an ECU system, so that gear shifting of the first control valve and the second control valve is controlled. Of course, the first control valve 10 and the second control valve 40 are not limited to the above-mentioned forms, and those skilled in the art can adapt and change the specific structures of the two according to the actual working requirements.
The embodiment also provides the engineering machinery, and the engineering machinery comprises the control valve assembly. Preferably, the working machine in this embodiment is an excavator, and the control valve assembly may control the movement of a boom, an arm, a bucket, and a turntable of the excavator. Of course, those skilled in the art will appreciate that other construction machines, such as cranes, rotary drilling rigs, etc., may be controlled by the control valve assembly. Meanwhile, any engineering machine driven by hydraulic pressure can be controlled by the control valve assembly.
According to the above structure, the control valve assembly of the present embodiment has the following advantages:
the structure of this embodiment controls the flow to the control cylinder through the combination of two main spools, has simplified the structure of case promptly and has shortened the length of case again, and the second spool adopts simple two-position two-way structure, and the first spool adopts simple three-position four-way structure. The structure of the embodiment can improve the control precision of the double main valve cores, the main valve cores are separately adjusted by the program control electromagnetic valve, the control flexibility is greatly improved, the electric control debugging is convenient, the trial-production times of the main valve cores are reduced, and the excavator can be controlled more finely.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
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| CN202110207870.6A CN112833061B (en) | 2021-02-24 | 2021-02-24 | Control valve assembly for engineering machinery and engineering machinery having the same |
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| CN202110207870.6A CN112833061B (en) | 2021-02-24 | 2021-02-24 | Control valve assembly for engineering machinery and engineering machinery having the same |
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| CN113803313A (en) * | 2021-10-29 | 2021-12-17 | 索特传动设备有限公司 | Multi-way control valve, hydraulic system and engineering machinery |
| CN117307550A (en) * | 2023-11-08 | 2023-12-29 | 湖北盛达动力科技有限公司 | Cab overturning oil cylinder with adjustable damping and balance |
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| CN210829935U (en) * | 2019-08-30 | 2020-06-23 | 江苏恒立液压科技有限公司 | Reversing valve and engineering machinery using same |
| CN214404166U (en) * | 2021-02-24 | 2021-10-15 | 索特传动设备有限公司 | Control valve assembly of engineering machinery and engineering machinery with control valve assembly |
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| CN113653695B (en) * | 2021-08-30 | 2023-08-25 | 杭州力龙液压有限公司 | Balancing valve structure and engineering machinery |
| CN113803313A (en) * | 2021-10-29 | 2021-12-17 | 索特传动设备有限公司 | Multi-way control valve, hydraulic system and engineering machinery |
| CN113803313B (en) * | 2021-10-29 | 2025-01-28 | 索特传动设备有限公司 | Multi-way control valve, hydraulic system and engineering machinery |
| CN117307550A (en) * | 2023-11-08 | 2023-12-29 | 湖北盛达动力科技有限公司 | Cab overturning oil cylinder with adjustable damping and balance |
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