CN112762032A - Telescopic hydraulic system and operation machine - Google Patents
Telescopic hydraulic system and operation machine Download PDFInfo
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- CN112762032A CN112762032A CN202110055557.5A CN202110055557A CN112762032A CN 112762032 A CN112762032 A CN 112762032A CN 202110055557 A CN202110055557 A CN 202110055557A CN 112762032 A CN112762032 A CN 112762032A
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- 239000003921 oil Substances 0.000 description 135
- 230000001276 controlling effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/68—Jibs foldable or otherwise adjustable in configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Jib Cranes (AREA)
Abstract
The embodiment of the invention provides a telescopic hydraulic system and an operating machine, and relates to the field of engineering mechanical equipment, wherein the telescopic hydraulic system comprises a telescopic oil cylinder, a proportional reversing valve, a telescopic balance valve and a differential switching valve, and the telescopic oil cylinder is provided with a rodless cavity and a rod cavity; the proportional reversing valve comprises a first oil control port and a second oil control port, the first oil control port is communicated with the rodless cavity through a first oil way, and the second oil control port is communicated with the rod cavity through a second oil way; the telescopic balance valve is arranged on the first oil way and communicated with the second oil way; the differential switching valve is respectively communicated with the first oil path, the second oil path and the proportional reversing valve. The hydraulic system realizes the differential extension of the telescopic oil cylinder through a differential switching valve, and the efficiency of the boom is improved; the oil return channel of the rodless cavity of the telescopic oil cylinder is increased through the differential switching valve, the oil return flow of the rodless cavity oil return channel is increased, and the arm retracting efficiency is further improved.
Description
Technical Field
The invention relates to the field of engineering machinery equipment, in particular to a telescopic hydraulic system and an operating machine.
Background
At present, a telescopic arm of an automobile crane is driven to extend and retract through a telescopic oil cylinder, oil is fed into a rodless cavity of the telescopic oil cylinder through switching of an electro-hydraulic proportional valve, oil discharged from a rod cavity passes through an oil return box of the electro-hydraulic proportional valve, the oil cylinder extends out, and the telescopic arm of the crane extends out; the oil inlet of a rod cavity of the telescopic oil cylinder is switched through the electro-hydraulic proportional valve, the oil outlet of a rodless cavity passes through an oil return box of the electro-hydraulic proportional valve, the oil cylinder retracts, and a telescopic arm of the crane retracts. The oil cylinder is locked through the telescopic balance valve, and the electro-hydraulic proportional valve is used for regulating the speed.
Along with the aggravation of market competition, the existing crane develops toward the arm length and the hoisting capacity, the stroke and the cylinder diameter of the telescopic oil cylinder are continuously increased, in order to ensure that the vehicle has enough fast telescopic speed, a large-flow oil pump and a control valve are selected, if the flow requirements of other actions of the vehicle are smaller, the waste of the power of the oil pump and an engine is caused, and meanwhile, the cost of products is increased by selecting large-flow elements.
Disclosure of Invention
The embodiment of the invention provides a telescopic hydraulic system and an operating machine, which are used for solving the problems of low boom extending efficiency and high cost of the telescopic hydraulic system in the prior art.
The embodiment of the invention provides a telescopic hydraulic system, which comprises:
the telescopic oil cylinder is provided with a rodless cavity and a rod cavity;
the proportional reversing valve comprises a first oil control port and a second oil control port, the first oil control port is communicated with the rodless cavity through a first oil path, and the second oil control port is communicated with the rod cavity through a second oil path;
the telescopic balance valve is arranged on the first oil way and communicated with the second oil way;
and a differential switching valve which is communicated with the first oil passage, the second oil passage and the proportional directional valve respectively.
According to the telescopic hydraulic system provided by the embodiment of the invention, the proportional reversing valve further comprises a first oil port and a second oil port, the first oil port of the proportional reversing valve is provided with a first proportional valve, and the first proportional valve is communicated with a control oil source; and a second oil port of the proportional reversing valve is provided with a second proportional valve.
According to an embodiment of the present invention, the hydraulic system further comprises: and the oil return tank is respectively communicated with the differential switching valve and the proportional reversing valve.
According to the telescopic hydraulic system, the differential switching valve comprises an electro-hydraulic reversing valve and a pilot electromagnetic valve; a first oil port of the electro-hydraulic reversing valve is communicated with the first oil way, a second oil port of the electro-hydraulic reversing valve is communicated with the second oil way, and a third oil port of the electro-hydraulic reversing valve and the first oil port and the second oil port of the proportional reversing valve are communicated with the oil return tank; and a first oil port of the pilot electromagnetic valve is communicated with a fourth oil port of the electro-hydraulic reversing valve, and a second oil port of the pilot electromagnetic valve is respectively communicated with the first proportional valve and the second proportional valve.
According to an embodiment of the present invention, the hydraulic system further comprises:
the two overflow valves are respectively arranged on the first oil way and the second oil way; and oil outlets of the two overflow valves are communicated with the oil return tank.
According to the telescopic hydraulic system, the proportional reversing valve is an electro-hydraulic proportional valve.
According to the telescopic hydraulic system of one embodiment of the invention, the differential switching valve is a solenoid directional valve.
According to the telescopic hydraulic system provided by the embodiment of the invention, the telescopic oil cylinder is a single-stage oil cylinder.
The embodiment of the invention also provides the operating machine, which comprises an operating machine host; the telescopic hydraulic system further comprises the telescopic oil cylinder, and the telescopic oil cylinder is connected with the large arm of the main machine of the working machine.
According to an embodiment of the invention, the work machine is a crane.
The telescopic hydraulic system provided by the embodiment of the invention realizes the differential extension of the telescopic oil cylinder through the differential switching valve, so that the efficiency of the boom is improved; the oil return channel of the rodless cavity of the telescopic oil cylinder is increased through reversing of the differential switching valve, the oil return flow of the rodless cavity oil return channel is increased, the arm retracting efficiency is further improved, and the differential switching valve is only added without changing the telescopic oil cylinder, so that the production cost is not increased.
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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a telescopic hydraulic system according to an embodiment of the present invention.
Reference numerals:
1. a telescopic oil cylinder; 2. a telescopic balance valve; 3. a differential switching valve; 4. an overflow valve; 5. a proportional directional valve; 6. a second oil passage; 7. a first oil passage; 31. an electro-hydraulic directional valve; 32. a pilot solenoid valve; y1, first proportional valve; y2, second proportional valve; and X, controlling an oil source.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of 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 embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
A telescopic hydraulic system and a working machine according to an embodiment of the present invention will be described with reference to fig. 1.
As shown in fig. 1, the telescopic hydraulic system includes a telescopic cylinder 1, a proportional directional valve 5, a telescopic balance valve 2, and a differential switching valve 3, the telescopic cylinder 1 is used for driving a telescopic boom of the working machine to be telescopic, and the telescopic cylinder 1 has a rodless chamber and a rod chamber. The proportional reversing valve 5 comprises a first oil control port and a second oil control port, the first oil control port is communicated with the rodless cavity through a first oil path 7, and the second oil control port is communicated with the rod cavity through a second oil path 6. When the telescopic oil cylinder 1 drives the telescopic arm of the operation machine to stretch, hydraulic oil can flow to the proportional directional valve 5 in an oil way connected with the rodless cavity and an oil way connected with the rod cavity and finally flow to the oil return tank, the specific control principle is similar to that of the related technology, and the detailed description is omitted here. The telescopic balance valve 2 is arranged on the first oil path 7 and communicated with the second oil path 6, pipelines for communicating the telescopic balance valve 2 with the second oil path 6 are used as a pressure relief channel of the telescopic balance valve 2, and pressure oil flows to the differential switching valve 3 through the pressure relief channel and finally flows to the oil return tank. The differential switching valve 3 is respectively communicated with the first oil path 7, the second oil path 6 and the proportional reversing valve 5, and is suitable for controlling pressure oil to simultaneously enter the rodless cavity and the rod cavity and controlling the conduction and the closing of an oil return channel of the rodless cavity.
The telescopic hydraulic system provided by the embodiment of the invention realizes the differential extension of the telescopic oil cylinder 1 by reversing through the differential switching valve, thereby improving the efficiency of the boom extension; the oil return channel of the rodless cavity of the telescopic oil cylinder 1 is increased through reversing of the differential switching valve, the oil return flow of the oil return channel of the rodless cavity is increased, the arm retracting efficiency is further improved, and the production cost is not increased because the telescopic oil cylinder 1 is not changed and only the differential switching valve 31 is added.
According to an embodiment of the invention, the hydraulic system further comprises: and the oil return tank is respectively communicated with the differential switching valve 3 and the proportional reversing valve 5.
According to the embodiment of the invention, the proportional directional valve 5 further comprises a first oil port and a second oil port, the first oil port of the proportional directional valve 5 is provided with a first proportional valve Y1, and the first proportional valve Y1 is communicated with the control oil source X; the second port of the proportional directional valve 5 is provided with a second proportional valve Y2. The differential switching valve 3 comprises an electro-hydraulic reversing valve 31 and a pilot electromagnetic valve 32, a first oil port of the electro-hydraulic reversing valve 31 is communicated with the first oil path 7, a second oil port of the electro-hydraulic reversing valve 31 is communicated with the second oil path 6, and a third oil port of the electro-hydraulic reversing valve 31 and a first oil port and a second oil port of the proportional reversing valve 5 are communicated with the oil return tank. The first port of the pilot solenoid valve 32 communicates with the fourth port of the electrohydraulic switching valve 31, and the second port of the pilot solenoid valve 32 communicates with the first proportional valve Y1 and the second proportional valve Y2, respectively. The proportional reversing valve 5 in this embodiment is an electro-hydraulic proportional valve.
According to the embodiment of the present invention, the differential switching valve 3 is an electromagnetic directional valve, the electromagnetic directional valve is respectively communicated with the first oil passage 7, the second oil passage 6 and the proportional directional valve 5, the function of the electromagnetic directional valve is the same as that of the electro-hydraulic directional valve 31 and the pilot electromagnetic valve 32 in the above embodiment, and the detailed description thereof is omitted.
According to the embodiment of the invention, the hydraulic system further includes two overflow valves 4, the two overflow valves 4 are respectively disposed in the first oil path 7 and the second oil path 6, and the overflow valves 4 play a role in pressure limiting protection. The oil return tank is communicated with oil outlets of the two overflow valves 4, and a third oil port of the pilot electromagnetic valve 32 and a third oil port of the electro-hydraulic reversing valve 31 are respectively communicated with the oil return tank.
According to one embodiment of the present invention, the telescopic cylinder 1 is a single-stage cylinder.
The working principle of the telescopic hydraulic system is as follows:
the first proportional valve Y1 is electrified, the proportional reversing valve 5 works at the left position, pressure oil enters a rodless cavity of the telescopic oil cylinder 1 through the telescopic balance valve 2, the pilot electromagnetic valve 32 is electrified, the electro-hydraulic reversing valve 31 works at the upper position, the pressure oil enters a rod cavity of the telescopic oil cylinder 1 through a second oil port of the electro-hydraulic reversing valve 31, the pressure oil enters the rodless cavity and the rod cavity of the telescopic oil cylinder 1 simultaneously, differential extension is achieved, and the boom extending efficiency is improved.
The second proportional valve Y2 is electrified, the pilot electromagnetic valve 32 is electrified, the proportional reversing valve 5 works at the right position, pressure oil enters a rod cavity of the telescopic oil cylinder 1 through a second oil control port and a second oil way 6 of the proportional reversing valve 5 in sequence, the telescopic balance valve 2 is opened at the same time, low-pressure oil in a rodless cavity of the telescopic oil cylinder 1 passes through the telescopic balance valve 2 and then is divided into two oil ways, one path of low-pressure oil flows to an oil return tank through the right position of the proportional reversing valve 5, and the electro-hydraulic reversing valve 31 works at the lower position; the other low-pressure oil flows into the electro-hydraulic directional valve 31 and flows to the oil return tank through a third oil port of the electro-hydraulic directional valve 31. The low-pressure oil returns through the two oil return channels, the flow of the oil return channel is increased, the maximum flow of the oil return is not limited by the proportional reversing valve 5, the maximum flow of the telescopic balance valve 2 is increased by 2 times on the basis of the traditional telescopic hydraulic system theoretically, and the efficiency of arm contraction is improved.
The invention also provides a working machine, which comprises a working machine host, and the working machine further comprises the telescopic hydraulic system in any one of the embodiments, wherein the telescopic oil cylinder 1 is connected with the large arm of the working machine host. The telescopic hydraulic system is arranged on the crane, so that the oil return flow of an oil return channel of the rodless cavity is increased, the efficiency of the telescopic boom is further improved, and the production cost is not increased because the telescopic oil cylinder 1 is not changed and only the differential switching valve 31 is added.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A telescopic hydraulic system, characterized in that it comprises:
the telescopic oil cylinder (1), the telescopic oil cylinder (1) has a rodless cavity and a rod cavity;
the proportional reversing valve (5) comprises a first oil control port and a second oil control port, the first oil control port is communicated with the rodless cavity through a first oil path (7), and the second oil control port is communicated with the rod cavity through a second oil path (6);
the telescopic balance valve (2) is arranged on the first oil way (7) and communicated with the second oil way (6);
and the differential switching valve (3), the differential switching valve (3) is respectively communicated with the first oil path (7), the second oil path (6) and the proportional reversing valve (5).
2. The telescopic hydraulic system according to claim 1, wherein the proportional directional valve (5) further comprises a first oil port and a second oil port, the first oil port of the proportional directional valve (5) is provided with a first proportional valve (Y1), and the first proportional valve (Y1) is communicated with a control oil source (X); and a second oil port of the proportional directional valve (5) is provided with a second proportional valve (Y2).
3. The telescopic hydraulic system of claim 2, further comprising: and the oil return tank is respectively communicated with the differential switching valve (3) and the proportional reversing valve (5).
4. Telescopic hydraulic system according to claim 3, wherein the differential switch valve (3) comprises: the oil return device comprises an electro-hydraulic reversing valve (31) and a pilot electromagnetic valve (32), wherein a first oil port of the electro-hydraulic reversing valve (31) is communicated with the first oil way (7), a second oil port of the electro-hydraulic reversing valve (31) is communicated with the second oil way (6), and a third oil port of the electro-hydraulic reversing valve (31) and a first oil port and a second oil port of the proportional reversing valve (5) are both communicated with the oil return tank; the first oil port of the pilot electromagnetic valve (32) is communicated with the fourth oil port of the electro-hydraulic reversing valve (31), and the second oil port of the pilot electromagnetic valve (32) is respectively communicated with the first proportional valve (Y1) and the second proportional valve (Y2).
5. The telescopic hydraulic system of claim 4, further comprising:
the two overflow valves (4), the two overflow valves (4) are respectively arranged on the first oil path (7) and the second oil path (6); oil outlets of the two overflow valves (4) are communicated with the oil return tank.
6. Telescopic hydraulic system according to claim 2, wherein the proportional reversing valve (5) is an electro-hydraulic proportional valve.
7. Telescopic hydraulic system according to any one of claims 1-6, wherein the differential switching valve (3) is a solenoid directional valve.
8. Telescopic hydraulic system according to any one of claims 1-6, characterized in that the telescopic cylinder (1) is a single stage cylinder.
9. A work machine comprising a work machine host; characterized by further comprising the telescopic hydraulic system of any one of claims 1 to 5, wherein the telescopic cylinder (1) is connected with the boom of the work machine main machine.
10. The work machine of claim 9, wherein the work machine is a crane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110055557.5A CN112762032B (en) | 2021-01-15 | 2021-01-15 | Telescopic hydraulic system and operating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110055557.5A CN112762032B (en) | 2021-01-15 | 2021-01-15 | Telescopic hydraulic system and operating machine |
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| Publication Number | Publication Date |
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| CN112762032A true CN112762032A (en) | 2021-05-07 |
| CN112762032B CN112762032B (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110055557.5A Active CN112762032B (en) | 2021-01-15 | 2021-01-15 | Telescopic hydraulic system and operating machine |
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2021
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| CN112762032B (en) | 2023-03-24 |
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