CN113606203A - Bucket rod hydraulic system and excavator - Google Patents
Bucket rod hydraulic system and excavator Download PDFInfo
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- CN113606203A CN113606203A CN202110935261.2A CN202110935261A CN113606203A CN 113606203 A CN113606203 A CN 113606203A CN 202110935261 A CN202110935261 A CN 202110935261A CN 113606203 A CN113606203 A CN 113606203A
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention relates to the technical field of hydraulic systems, in particular to a bucket rod hydraulic system and an excavator, wherein the bucket rod hydraulic system comprises a first hydraulic pump, and the first hydraulic pump is communicated with an oil tank; an oil inlet of the first electric proportional flow valve is communicated with the first hydraulic pump; a first main valve in communication with an oil outlet of the first electro-proportional flow valve, the first main valve having a first control bit and a second control bit; a hydraulic cylinder, the first main valve being in communication with the hydraulic cylinder; the second hydraulic pump is communicated with the oil tank; an oil inlet of the second electric proportional flow valve is communicated with the second hydraulic pump; a second main valve in communication with an oil outlet of the second electro-proportional flow valve, the second main valve having a third control position and a fourth control position, the second main valve in communication with the hydraulic cylinder. The invention can improve the control precision and the control response speed.
Description
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to a bucket rod hydraulic system and an excavator.
Background
In a conventional arm hydraulic system of an excavator, a hydraulic flow rate required for an arm operation is controlled by a main spool of a spool. When the bucket rod oil cylinder takes oil, the oil taking flow of the bucket rod is determined by the opening of the main valve core. When the excavator can normally work to perform compound actions only by means of simultaneous actions of a plurality of mechanisms such as a movable arm, an arm, a bucket and a rotary mechanism, oil is fed into an arm cylinder, and the opening degrees of a slide valve and a priority valve are controlled by hydraulic pilot oil. The return oil of the hydraulic cylinder of the bucket rod passes through a valve core of the slide valve, and the opening degree of the valve core is still controlled by hydraulic pilot oil. Along with the requirement of the market on the accurate operation of the excavator, the flow of the spool valve core and the priority valve core is controlled only by the pilot oil of the pilot control system, so that when the opening of the spool is fixed, the opening of the priority valve cannot be accurately adjusted due to the limitation of the accuracy of the hydraulic pilot oil, the distribution of the flow cannot be accurately adjusted, and the control accuracy cannot be improved. In addition, the hydraulic oil of the existing bucket rod hydraulic system has the defects of easy leakage and the like, so that the control response speed is low.
Therefore, a bucket rod hydraulic system and an excavator are needed to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a bucket rod hydraulic system and an excavator, which can improve control accuracy and control response speed.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dipper hydraulic system, comprising:
the first hydraulic pump is communicated with the oil tank;
an oil inlet of the first electric proportional flow valve is communicated with the first hydraulic pump;
a first main valve in communication with an oil outlet of the first electro-proportional flow valve, the first main valve having a first control bit and a second control bit;
the first main valve is communicated with the hydraulic cylinder, when the first main valve is positioned at the first control position, oil is fed into a rod cavity of the hydraulic cylinder, oil is fed back into a rodless cavity of the hydraulic cylinder, and when the first main valve is positioned at the second control position, oil is fed into the rod cavity of the hydraulic cylinder, and oil is fed into the rodless cavity of the hydraulic cylinder;
the second hydraulic pump is communicated with the oil tank;
an oil inlet of the second electric proportional flow valve is communicated with the second hydraulic pump;
the second main valve is communicated with an oil outlet of the second electric proportional flow valve, the second main valve is provided with a third control position and a fourth control position, the second main valve is communicated with the hydraulic cylinder, when the second main valve is positioned at the third control position, oil is fed into a rod cavity of the hydraulic cylinder, oil is fed back into a rodless cavity of the hydraulic cylinder, and when the second main valve is positioned at the fourth control position, oil is fed into the rod cavity of the hydraulic cylinder, and oil is fed into the rodless cavity of the hydraulic cylinder;
the first main valve is in a first control position while the second main valve is in a third control position to control retraction of a piston of the hydraulic cylinder, or the first main valve is in a second control position while the second main valve is in a fourth control position to control extension of a piston of the hydraulic cylinder.
Further, an oil outlet of the first electric proportional flow valve is communicated with an oil inlet of the first main valve, the first control port of the first main valve is communicated with the oil port of the rod cavity of the hydraulic cylinder, the second control port of the first main valve is communicated with the oil port of the rodless cavity of the hydraulic cylinder, a first oil outlet of the first main valve is communicated with an oil return pipeline, a second oil outlet of the first main valve is communicated with the oil tank, when the first main valve is at the first control position, the oil inlet of the first main valve is communicated with the first control port of the first main valve, the second control port of the first main valve is communicated with the second oil outlet, when the first main valve is located at the second control position, the oil inlet of the first main valve is communicated with the second control port of the first main valve, and the first control port of the first main valve is communicated with the first oil outlet.
Furthermore, a first reversing control device and a second reversing control device are integrated on the first main valve, and the first reversing control device and the second reversing control device are respectively located on two sides of the first main valve and are used for controlling a valve core of the first main valve to be located at the first control position or the second control position.
Further, the first reversing control device is a first electric control pressure valve, an oil inlet of the first electric control pressure valve is communicated with the oil tank, and an oil outlet of the first electric control pressure valve is communicated with a first reversing control port of the first main valve.
Furthermore, the second reversing control device is a second electric control pressure valve, an oil inlet of the second electric control pressure valve is communicated with the oil tank, and an oil outlet of the second electric control pressure valve is communicated with the second reversing control port of the first main valve.
And a regeneration one-way valve is arranged on the oil return pipeline, an oil inlet of the regeneration one-way valve is communicated with a first oil outlet of the first main valve, and an oil outlet of the regeneration one-way valve is communicated with an oil inlet of the first main valve.
Further, the first electric proportional flow valve is a pilot-operated electric proportional flow valve.
Further, the first hydraulic pump is a variable displacement pump.
Furthermore, a third reversing control device and a fourth reversing control device are integrated on the second main valve, and the third reversing control device and the fourth reversing control device are respectively located on two sides of the second main valve and are used for controlling a valve core of the second main valve to be located at the third control position or the fourth control position.
An excavator comprising a stick hydraulic system as described above.
The invention has the beneficial effects that:
the invention provides a bucket rod hydraulic system which comprises a control system and a control system, wherein the control system is composed of a first hydraulic pump, a first electric proportional flow valve and a first main valve, the control system is composed of a second hydraulic pump, a second electric proportional flow valve and a second main valve, and a piston rod of a hydraulic cylinder is extended or retracted by controlling the hydraulic cylinder through two sets of control systems. Through adopting first electric proportional flow valve and second electric proportional flow valve, can make things convenient for accurate control aperture to promote the precision to pneumatic cylinder control, through two sets of control system coordinated control each other moreover, the response speed that can control on the one hand, on the other hand, can further promote the control accuracy of pneumatic cylinder through two sets of control system cooperations.
Drawings
Fig. 1 is a hydraulic schematic diagram of a bucket rod hydraulic system of the present invention.
In the figure:
10. a first hydraulic pump; 11. a first electro-proportional flow valve; 12. a first main valve; 13. a first commutation control device; 14. a second commutation control device; 15. a regenerative check valve; 20. a second hydraulic pump; 21. a second electro-proportional flow valve; 22. a second main valve; 23. a third commutation control means; 24. a fourth commutation control means; 30. a hydraulic cylinder; 40. and an oil tank.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable 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 the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In order to control accuracy of a hydraulic cylinder of an arm and speed of response of lift control, as shown in fig. 1, the present invention provides an arm hydraulic system. This dipper hydraulic system includes: a tank 40, a first hydraulic pump 10, a first electro-proportional flow valve 11, a first main valve 12, a second hydraulic pump 20, a second electro-proportional flow valve 21, a second main valve 22, and a hydraulic cylinder 30.
Wherein, the oil inlet of the first hydraulic pump 10 is communicated with the oil tank 40; an oil inlet of the first electric proportional flow valve 11 is communicated with an oil outlet of the first hydraulic pump 10; a first main valve 12 is communicated with an oil outlet of the first electric proportional flow valve 11, and the first main valve 12 is provided with a first control position and a second control position; the first main valve 12 is communicated with the hydraulic cylinder 30, when the first main valve 12 is at a first control position, oil is fed into a rod cavity of the hydraulic cylinder 30, oil is fed into a rodless cavity of the hydraulic cylinder 30, when the first main valve 12 is at a second control position, oil is fed into the rod cavity of the hydraulic cylinder 30, and oil is fed into the rodless cavity of the hydraulic cylinder 30; the second hydraulic pump 20 is communicated with the oil tank 40; an oil inlet of a second electric proportional flow valve 21 is communicated with a second hydraulic pump 20; the second main valve 22 is communicated with an oil outlet of the second electric proportional flow valve 21, the second main valve 22 has a third control position and a fourth control position, the second main valve 22 is communicated with the hydraulic cylinder 30, when the second main valve 22 is in the third control position, the rod cavity of the hydraulic cylinder 30 is filled with oil, the rodless cavity is filled with oil, and when the second main valve 22 is in the fourth control position, the rod cavity of the hydraulic cylinder 30 is filled with oil, and the rodless cavity is filled with oil; first main valve 12 is in the first control position while second main valve 22 is in the third control position to control piston retraction of hydraulic cylinder 30, or first main valve 12 is in the second control position while second main valve 22 is in the fourth control position to control piston extension of hydraulic cylinder 30.
By using the original anti-drop one-way valve or the hydraulic control priority valve, the oil flow of the main valve core passage of the main oil passage cannot be accurately adjusted, so that the hydraulic cylinder 30 of the bucket rod cannot accurately act, and the excavator cannot accurately work. In the embodiment, the electric proportional flow valve is adopted, and the first electric proportional flow valve 11 and the second electric proportional flow valve 21 are adopted, so that not only are the basic functions of the anti-drop one-way valve and the priority valve reserved, but also the opening degree can be conveniently and accurately controlled, and the control precision of the hydraulic cylinder 30 is improved; moreover, by the coordinated control of the first main valve 12 and the second main valve 22, on the one hand, the response speed can be controlled, and on the other hand, the control accuracy of the hydraulic cylinder 30 can be further improved by the cooperative cooperation of the first electro-proportional flow valve 11 and the second electro-proportional flow valve 21.
Further, the oil outlet of the first electric proportional flow valve 11 is communicated with the oil inlet of the first main valve 12, the first control port of the first main valve 12 is communicated with the rod cavity oil port of the hydraulic cylinder 30, the second control port of the first main valve 12 is communicated with the rodless cavity oil port of the hydraulic cylinder 30, the first oil outlet of the first main valve 12 is communicated with the oil return pipeline, the oil return pipeline is communicated with the oil tank 40 or the oil inlet of the first main valve 12, the second oil outlet of the first main valve 12 is communicated with the oil tank 40, when the first main valve 12 is at the first control position, the oil inlet of the first main valve 12 is communicated with the first control port of the first main valve 12, the second control port of the first main valve 12 is communicated with the second oil outlet, when the first main valve 12 is at the second control position, the oil inlet of the first main valve 12 is communicated with the second control port of the first main valve 12, and the first control port of the first main valve 12 is communicated with the first oil outlet. In particular, in the present embodiment, the first main valve 12 is a three-position six-way valve, which can meet the requirement of controlling the hydraulic cylinder 30 well. In other embodiments, the skilled person can also design flexibly according to the actual needs, without placing too many restrictions on the type of first main valve 12.
Further, in this embodiment, a regeneration check valve 15 is disposed on the oil return pipeline, an oil inlet of the regeneration check valve 15 is communicated with the first oil outlet of the first main valve 12, and an oil outlet of the regeneration check valve 15 is communicated with an oil inlet of the first main valve 12. Through setting up regeneration check valve 15, when rodless chamber oil feed, have the pole chamber oil return, some hydraulic oil in having the pole chamber enters into oil tank 40 through second main valve 22, and the part enters into rodless chamber through the oil inlet of first main valve 12 through regeneration check valve 15 for the stretching out speed of the piston of pneumatic cylinder 30, makes the pneumatic cylinder 30 quick response of dipper.
Further, a first direction control device 13 and a second direction control device 14 are integrated on the first main valve 12, the first direction control device 13 and the second direction control device 14 are respectively located at two sides of the first main valve 12, and a spool for controlling the first main valve 12 is located at a first control position or a second control position. The displacement of the valve core of the first main valve 12 is controlled by controlling the first reversing control device 13 and the second reversing control device 14, so that the on-off of different oil paths is realized.
Specifically, the first reversing control device 13 is a first electronic control pressure valve, an oil inlet of the first electronic control pressure valve is communicated with the oil tank 40, and an oil outlet of the first electronic control pressure valve is communicated with the first reversing control port of the first main valve 12. The first reversing control port which discharges the hydraulic oil to the first main valve 12 by controlling the opening of the first electric control pressure valve pushes the valve core to act, so that the first main valve 12 is in the first control position. The opening degree of the first electric control pressure valve can be changed by changing the magnitude of the current applied to the first electric control pressure valve, so that the valve core displacement of the first main valve 12 is controlled, and the control precision is ensured.
Similarly, the second reversing control device 14 is a second electrically controlled pressure valve, an oil inlet of the second electrically controlled pressure valve is communicated with the oil tank 40, and an oil outlet of the second electrically controlled pressure valve is communicated with the second reversing control port of the first main valve 12. The second reversing control port which discharges the hydraulic oil to the first main valve 12 by controlling the opening of the second electric control pressure valve pushes the valve core to act, so that the first main valve 12 is in a second control position. The opening degree of the first electric control pressure valve can be changed by changing the magnitude of the current applied to the second electric control pressure valve, so that the valve core displacement of the first main valve 12 is controlled, and the control precision is ensured. In other embodiments, the first commutation control device 13 and the second commutation control device 14 may also use electromagnets for commutation control, which is not limited herein.
Further, the first electric proportional flow valve 11 is a pilot type electric proportional flow valve. The accuracy of the control of the hydraulic cylinder 30 can be further improved by using the advantage of the pilot type electro-proportional flow valve, which is a pilot type electro-proportional flow valve, in this embodiment, the second electro-proportional flow valve 21 is also a pilot type electro-proportional flow valve.
Further, the first hydraulic pump 10 is a variable displacement pump. When the flow of the hydraulic oil entering the hydraulic cylinder 30 through the first main valve 12 is controlled by adopting the variable pump, the flow of the variable pump can be changed for control, so that the flexibility of controlling the hydraulic cylinder 30 is increased, and the control precision is further improved by matching the variable pump with the first electro-proportional flow valve 11. In the present embodiment, the second hydraulic pump 20 is a variable level pump.
Further, a third directional control device 23 and a fourth directional control device 24 are integrated on the second main valve 22, the third directional control device 23 and the fourth directional control device 24 are respectively located at two sides of the second main valve 22, and a spool for controlling the second main valve 22 is located at the third control position or the fourth control position. The control of the spool of the second main valve 22 can be realized by controlling the third and fourth switching devices. Specifically, in the present embodiment, the structure of the second main valve 22 is the same as that of the first main valve 12, and the detailed description of the structure of the second main valve 22 is omitted here, and in other embodiments, the second main valve 22 only needs to be able to achieve the same function as that of the first main valve 21, and the type of the second main valve 22 is not limited too much.
Specifically, the steps of the first and second main valves 12, 22 controlling the hydraulic cylinder 30 are as follows:
the hydraulic cylinder 30 has a rod cavity for oil feeding and no rod cavity for oil returning:
the rod chamber flow is obtained according to the target action speed of the hydraulic cylinder 30, the first main valve 12 and the second main valve 22 are switched to be in the first control position and the third control position under the pressure control provided by the first switching control device 13 and the third switching control device 23, and simultaneously, the maximum current is provided for the electromagnets of the first electric proportional flow valve 11 and the second electric proportional flow valve 21, so that the first electric proportional flow valve 11 and the first electric proportional flow valve 11 are both in the maximum opening. The hydraulic oil of the first hydraulic pump 10 and the second hydraulic pump 20 enters the rod cavity through the first main valve 12 and the second main valve 22, the rodless cavity returns oil and enters the oil tank 40, and the flow precision control principle is as follows:
1. if the speed of the hydraulic cylinder 30 is desired, the sections remain unchanged. If the speed of the hydraulic cylinder 30 is higher than the requirement, the valve core opening degrees of the first main valve 12 and the second main valve 22 are reduced to reduce the flow rate, when the speed approaches to the set degree, the electromagnet signals of the first electro-proportional flow valve 11 and the second electro-proportional flow valve 21 are adjusted, the opening degrees of the first electro-proportional flow valve 11 and the second electro-proportional flow valve 21 are finely adjusted, and therefore the flow rate is accurately controlled to enable the hydraulic cylinder 30 to meet the target speed.
2. If the speed is lower than the demand, the control system further controls the first main valve 12 and the second main valve 22 to increase the flow rate, and when the speed of the hydraulic cylinder 30 exceeds the demand, the operation process in the step 1 is repeated.
The hydraulic cylinder 30 has oil inlet in the rodless cavity and oil return in the rod cavity:
the rod chamber flow is obtained according to the target action speed of the hydraulic cylinder 30, the first main valve 12 and the second main valve 22 are reversed under the action of the second reversing control device 14 and the fourth reversing control device 24, and meanwhile, the electromagnets of the first electric proportional flow valve 11 and the second electric proportional flow valve 21 are provided with maximum current, so that the first electric proportional flow valve 11 and the second electric proportional flow valve 21 are in maximum opening. The hydraulic oil of the first hydraulic pump 10 and the second hydraulic pump 20 enters the rod cavity of the hydraulic cylinder 30 through the first main valve 12 and the second main valve 22, the return oil of the rodless cavity enters the oil tank 40 through the second main valve 22, the other part of the return oil enters the rodless cavity after passing through the regenerative check valve 15, and if the speed of the hydraulic cylinder 30 meets the requirement, all parts are kept unchanged.
The embodiment also provides an excavator, which comprises the bucket rod hydraulic system, the opening degree can be conveniently and accurately controlled by adopting the first electric proportional flow valve 11 and the second electric proportional flow valve 21, so that the control precision of the hydraulic cylinder 30 is improved, and the response speed which can be controlled on one hand and the control precision of the hydraulic cylinder 30 can be further improved by the cooperative control of the two control systems on the other hand.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. 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. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A dipper hydraulic system, comprising:
a first hydraulic pump (10), the first hydraulic pump (10) being in communication with an oil tank (40);
a first electric proportional flow valve (11), wherein an oil inlet of the first electric proportional flow valve (11) is communicated with the first hydraulic pump (10);
a first main valve (12) in communication with an oil outlet of the first electro-proportional flow valve (11), the first main valve (12) having a first control bit and a second control bit;
the hydraulic cylinder (30), the first main valve (12) is communicated with the hydraulic cylinder (30), when the first main valve (12) is at the first control position, the rod cavity of the hydraulic cylinder (30) is fed with oil, and the rodless cavity of the hydraulic cylinder (30) is fed with oil, and when the first main valve (12) is at the second control position, the rod cavity of the hydraulic cylinder (30) is fed with oil, and the rodless cavity is fed with oil;
a second hydraulic pump (20), said second hydraulic pump (20) being in communication with said oil tank (40);
a second electric proportional flow valve (21), wherein an oil inlet of the second electric proportional flow valve (21) is communicated with the second hydraulic pump (20);
a second main valve (22) in communication with an outlet of the second electro-proportional flow valve (21), the second main valve (22) having a third control position and a fourth control position, the second main valve (22) being in communication with the hydraulic cylinder (30), when the second main valve (22) is in the third control position, the rod chamber of the hydraulic cylinder (30) is filled with oil and the rodless chamber is filled with oil, and when the second main valve (22) is in the fourth control position, the rod chamber of the hydraulic cylinder (30) is filled with oil and the rodless chamber is filled with oil;
the first main valve (12) is in a first control position while the second main valve (22) is in a third control position to control piston retraction of the hydraulic cylinder (30), or the first main valve (12) is in a second control position while the second main valve (22) is in a fourth control position to control piston extension of the hydraulic cylinder (30).
2. The bucket rod hydraulic system of claim 1, wherein an oil outlet of the first electric proportional flow valve (11) is in communication with an oil inlet of the first main valve (12), a first control port of the first main valve (12) is in communication with a rod chamber oil port of the hydraulic cylinder (30), a second control port of the first main valve (12) is in communication with a rodless chamber oil port of the hydraulic cylinder (30), a first oil outlet of the first main valve (12) is in communication with an oil return line, a second oil outlet of the first main valve (12) is in communication with the oil tank (40), an oil inlet of the first main valve (12) is in communication with a first control port of the first main valve (12) when the first main valve (12) is in the first control position, a second control port of the first main valve (12) is in communication with the second oil outlet, when the first main valve (12) is in the second control position, the oil inlet of the first main valve (12) is communicated with the second control port of the first main valve (12), and the first control port of the first main valve (12) is communicated with the first oil outlet.
3. The bucket rod hydraulic system of claim 2, wherein the first main valve (12) is integrated with a first reversing control device (13) and a second reversing control device (14), the first reversing control device (13) and the second reversing control device (14) are respectively located on two sides of the first main valve (12), and a valve core for controlling the first main valve (12) is located in the first control position or the second control position.
4. The bucket rod hydraulic system of claim 3, wherein the first reversing control device (13) is a first electrically controlled pressure valve, an oil inlet of the first electrically controlled pressure valve is communicated with the oil tank (40), and an oil outlet of the first electrically controlled pressure valve is communicated with a first reversing control port of the first main valve (12).
5. The bucket rod hydraulic system of claim 3, wherein the second reversing control device (14) is a second electrically controlled pressure valve, an oil inlet of the second electrically controlled pressure valve is communicated with the oil tank (40), and an oil outlet of the second electrically controlled pressure valve is communicated with the second reversing control port of the first main valve (12).
6. The bucket rod hydraulic system of claim 2, wherein a regeneration check valve (15) is disposed on the oil return pipeline, an oil inlet of the regeneration check valve (15) is communicated with the first oil outlet of the first main valve (12), and an oil outlet of the regeneration check valve (15) is communicated with the oil inlet of the first main valve (12).
7. The stick hydraulic system according to any one of claims 1-6, characterized in that the first electro proportional flow valve (11) is a pilot electro proportional flow valve.
8. The stick hydraulic system according to any one of claims 1-6, wherein the first hydraulic pump (10) is a variable displacement pump.
9. The bucket rod hydraulic system of claim 1, wherein the second main valve (22) is integrated with a third directional control device (23) and a fourth directional control device (24), the third directional control device (23) and the fourth directional control device (24) are respectively located on two sides of the second main valve (22), and a valve core for controlling the second main valve (22) is located in the third control position or the fourth control position.
10. An excavator comprising a stick hydraulic system as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110935261.2A CN113606203B (en) | 2021-08-16 | 2021-08-16 | Bucket rod hydraulic system and excavator |
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| CN202110935261.2A CN113606203B (en) | 2021-08-16 | 2021-08-16 | Bucket rod hydraulic system and excavator |
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| CN113606203B CN113606203B (en) | 2023-06-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114321044A (en) * | 2021-12-31 | 2022-04-12 | 潍柴动力股份有限公司 | Bucket rod control valve structure and excavator |
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| CN114321044A (en) * | 2021-12-31 | 2022-04-12 | 潍柴动力股份有限公司 | Bucket rod control valve structure and excavator |
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Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Patentee after: Weichai Hydraulic Transmission Co.,Ltd. Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Patentee before: LINDE HYDRAULICS (CHINA) Co.,Ltd. |