CN112573418B - Hydraulic jack with oil return structure - Google Patents
Hydraulic jack with oil return structure Download PDFInfo
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- CN112573418B CN112573418B CN202011540458.8A CN202011540458A CN112573418B CN 112573418 B CN112573418 B CN 112573418B CN 202011540458 A CN202011540458 A CN 202011540458A CN 112573418 B CN112573418 B CN 112573418B
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- Prior art keywords
- oil return
- oil
- valve rod
- channel
- return valve
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
- 239000010959 steel Substances 0.000 claims abstract description 56
- 238000007789 sealing Methods 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The application belongs to the field of hydraulic lifting, and particularly relates to a hydraulic jack with an oil return structure, which comprises an oil cylinder, an oil storage cavity, a base and an oil return valve rod; the base is provided with a first oil way communicated with the oil cylinder and an oil return oil way communicated with the oil storage cavity; an oil return channel and an oil return hole are formed in the end of the oil return valve rod; the oil return channel is communicated with the oil return way through the oil return hole; a second steel ball is arranged in the oil return channel through a spring, and clearance fit is adopted between the second steel ball and the oil return channel; a first steel ball is arranged in the oil return valve cavity, and the first steel ball seals the first oil way when the oil return valve rod is screwed into the limit position of the oil return valve rod mounting channel; when the oil return valve rod is unscrewed, the first steel ball unseals the first oil way, and the first oil way, the oil return valve cavity, the oil return channel and the oil return oil way are communicated. According to the application, the slow structure is arranged in the oil return valve rod, so that oil leakage of the process hole is effectively avoided.
Description
Technical Field
The invention belongs to the field of hydraulic lifting, and particularly relates to a hydraulic jack with an oil return structure.
Background
The jack is common equipment in the field of repairing vehicles and is also common lifting equipment in the field of industry. The slow oil return is a necessary function of the jack. The existing slow oil return structure realizes the function of load slow oil return by matching the steel ball at the bottom of the cylinder on the base with a valve wire. When no load exists, the steel ball is jacked up by the spring, the oil way of the oil return hole is smooth, and the crane boom descends rapidly; when the load is applied, the pressure in the oil cylinder is larger than the elastic force of the spring, the steel ball is propped against the oil return hole, and the oil can only slowly return to the oil storage cavity through the valve line of the oil return hole, so that the load of the crane arm can slowly drop.
However, the applicant finds that the existing slow oil return structure has the following technical problems:
1. the process holes bear high pressure during loading, and oil leakage is easy to occur.
2. The maintenance is complicated and the hydraulic components need to be disassembled.
Disclosure of Invention
The application provides a hydraulic jack with an oil return structure, which is characterized in that a slow structure is arranged in an oil return valve rod, so that oil leakage of a process hole is effectively avoided.
In order to achieve the technical aim, the technical scheme adopted by the application is that the hydraulic jack with the oil return structure comprises an oil cylinder, an oil storage cavity, a base and an oil return valve rod;
The base is provided with a first oil way communicated with the oil cylinder and an oil return oil way communicated with the oil storage cavity; the oil return valve rod mounting channel is designed coaxially with the first oil way, and the diameter of the oil return valve rod mounting channel is larger than that of the first oil way;
The end head of the oil return valve rod is provided with an oil return channel along the axial direction of the oil return valve rod and an oil return hole along the radial direction of the oil return valve rod; the oil return channel is communicated with the oil return way through the oil return hole; the oil return valve rod is fixedly provided with a gasket at the end head of the oil return channel, and the gasket is provided with an oil inlet groove; the oil return valve rod is arranged in the oil return valve rod mounting channel, and an oil return valve cavity is formed between the gasket and the oil return valve rod mounting channel;
a second steel ball is arranged in the oil return channel through a spring, and clearance fit is adopted between the second steel ball and the oil return channel; a first steel ball is arranged in the oil return valve cavity, and the first steel ball seals the first oil way when the oil return valve rod is screwed into the limit position of the oil return valve rod mounting channel; when the oil return valve rod is unscrewed (unscrewed), the first steel ball unseals the first oil way, and the first oil way, the oil return valve cavity, the oil return channel and the oil return oil way are communicated.
As an improved technical scheme of the application, the gasket is a boss-shaped gasket.
As an improved technical scheme of the application, the gasket is in interference fit with the end head of the oil return channel.
As an improved technical scheme of the application, the oil return oil way and the first oil way form an acute angle.
As an improved technical scheme of the application, the oil return channel comprises a large-diameter oil return channel and a small-diameter oil return channel which are coaxially designed, and the gasket is arranged at the end head of the large-diameter oil return channel; the second steel ball is arranged in the large-diameter oil return channel, a gap is reserved between the second steel ball and the large-diameter oil return channel, meanwhile, under the condition of bearing pressure, the oil return valve rod is unscrewed, the first steel ball unseals the first oil way, oil enters the interior of the oil return valve rod through the first oil way, the second steel ball in the rod is compressed by the compression spring, and when the second steel ball blocks the small-diameter oil return channel in the state, the oil enters the oil return hole through a valve line reserved between the second steel ball and the small-diameter oil return channel; the oil return hole is arranged on the small-diameter oil return channel; the large-diameter oil return passage is defined as an oil return passage having a large diameter relative to the small-diameter oil return passage.
As an improved technical scheme of the application, the oil return valve rod mounting channel is in threaded connection with the oil return valve rod; and the tail end of the oil return valve rod in threaded connection is provided with a sealing ring.
Advantageous effects
The oil return structure of the application avoids designing a process hole on the oil way, namely avoids oil leakage of the oil return oil way caused by the process hole;
The application adopts the valve line to realize slow oil return, and the valve line is a tiny groove reserved between the second steel ball and the inner wall of the oil return valve cavity; compared with the prior art that oil return is carried out by utilizing the thread clearance of the valve rod, the slow oil return process is more stable; and is convenient to maintain.
The main improvement point of the oil return structure is arranged on the oil return valve rod, and different oil return speeds can be realized by only replacing the oil return valve rod by different jacks, so that the base has higher usability.
Drawings
FIG. 1 is a schematic diagram of an oil return structure according to the present application;
FIG. 2 is a schematic diagram of a gasket;
FIG. 3 is an exploded view of the oil return structure of the present application;
In the figure: 1, a first oil way; 2, a gasket; 3, an oil inlet groove; 4, a valve wire; 5, oil return holes; 6, oil return valve rod; 7, a spring; 8, a second steel ball; 9, a first steel ball; 10, an oil return way; 11, an oil storage cavity.
The arrow A direction represents the unscrewing direction of the oil return valve rod; the direction of arrow B represents the direction of rotation of the return valve stem.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
The oil return valve cavity is arranged at the joint of the base and the oil return valve rod 6, and the main body of the oil return structure is arranged on the oil return valve rod 6; and the opening and sealing of the oil return way 10 are realized by adopting the matching of the first steel ball 9 and the second steel ball 8. Specifically, when the oil return valve rod 6 is unscrewed from the oil return valve rod mounting channel, the gasket 2 is far away from the first steel ball 9, the first steel ball 9 releases the blocking of the first oil way 1, and liquid in the oil cylinder flows to the oil storage cavity 11 through the oil return valve cavity, a gap between the second steel ball 8 and the oil return channel and the oil return hole 5. When the oil return valve rod 6 is screwed, the gasket 2 pushes the first steel ball 9, the first steel ball 9 seals the first oil way 1, at the moment, the oil return way is completely closed, and the jack is in a normal working state capable of bearing pressure at the moment.
For a better explanation of the technical solution of the present application, the following details are described with reference to examples:
example 1
As shown in fig. 1, 2 and 3, a hydraulic jack with an oil return structure comprises an oil cylinder, an oil storage cavity 11, a base and an oil return valve rod 6;
The base is provided with a first oil way 1 communicated with the oil cylinder and an oil return oil way 10 communicated with the oil storage cavity 11; the oil return valve rod mounting channel is designed coaxially with the first oil way 1, and the diameter of the oil return valve rod mounting channel is larger than that of the first oil way 1;
The end of the oil return valve rod 6 is provided with an oil return channel along the axial direction of the oil return valve rod and an oil return hole 5 along the radial direction of the oil return valve rod; the oil return channel is communicated with the oil return way 10 through the oil return hole 5; the oil return valve rod 6 is fixedly provided with a gasket 2 at the end of the oil return channel, and an oil inlet groove 3 is arranged on the gasket 2; the oil return valve rod 6 is arranged in the oil return valve rod mounting channel, and an oil return valve cavity is formed between the gasket 2 and the oil return valve rod mounting channel;
the oil return channel is internally provided with a second steel ball 8 through a spring 7, and the second steel ball 8 is in clearance fit with the oil return channel; a first steel ball 9 is arranged in the oil return valve cavity, and when the oil return valve rod 6 is screwed into the limit position of the oil return valve rod installation channel, the first steel ball 9 seals the first oil way 1; when the oil return valve rod 6 is unscrewed, the first steel ball unseals the first oil way, and the first oil way 1, the oil return valve cavity, the oil return channel and the oil return oil way 10 are communicated.
As an improved technical scheme of the application, the gasket 2 is a boss-shaped gasket 2; and the gasket 2 is in interference fit with the end head of the oil return passage.
As an improved technical scheme of the application, the oil return passage 10 and the first oil passage 1 form an acute angle.
As an improved technical scheme of the application, the oil return channel comprises a large-diameter oil return channel and a small-diameter oil return channel which are coaxially designed, and the gasket is arranged at the end head of the large-diameter oil return channel; the second steel ball is arranged in the large-diameter oil return channel, a valve line 4 (i.e. a gap) is reserved between the second steel ball and the large-diameter oil return channel, meanwhile, under the condition of bearing pressure, the oil return valve rod is unscrewed, the first steel ball unseals the first oil way, oil enters the interior of the oil return valve rod through the first oil way, the second steel ball in the rod is pressed to compress the spring, and when the second steel ball seals the small-diameter oil return channel in this state, the oil enters the oil return hole through the valve line reserved between the second steel ball and the small-diameter oil return channel; the oil return hole is arranged on the small-diameter oil return channel; the large-diameter oil return passage is defined as an oil return passage having a large diameter relative to the small-diameter oil return passage.
As an improved technical scheme of the application, the oil return valve rod mounting channel is in threaded connection with the oil return valve rod 6; and the oil return valve rod 6 is provided with a sealing ring at the tail end of the threaded connection.
The application process is as follows: the hydraulic part is unloaded, the oil return valve rod 6 is screwed out in the direction A, at the moment, the first oil way 1 is at low pressure, the oil washes out the first steel ball 9, and enters the oil return valve rod 6 through the oil inlet groove 3 on the boss gasket 2; because the pressure in the oil return valve rod 6 (oil return valve cavity) is low, the pressure borne by the second steel ball 8 can not enable the oil way to be closed, and oil quickly enters the oil return oil way 10 through a gap between the first steel ball 9 in the oil return valve rod 6 and the oil return channel and the oil return hole 5, so that the oil returns to the oil storage cavity 11; the rapid descent of the boom when empty is achieved.
The hydraulic component load, oil return valve rod 6 is to the A to unscrew, and first oil circuit 1 is high pressure this moment, and the fluid dashes out first steel ball 9, and it is inside to get into oil return valve rod 6 through the oil inlet groove 3 on the boss gasket 2, and oil return valve rod 6 inside high pressure this moment, spring 7 compression, second steel ball 8 are pushed up oil return valve rod 6 inside minor diameter oil return channel department (because second steel ball 8 with be equipped with valve line 4 between the minor diameter oil return channel), make fluid accessible valve line 4 only slowly get into return first oil gallery 5, thereby get back to oil storage chamber 11, slow decline when realizing the jib loading.
The foregoing is a description of embodiments of the invention, which are specific and detailed, but are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (5)
1. The hydraulic jack with the oil return structure is characterized by comprising an oil cylinder, an oil storage cavity, a base and an oil return valve rod;
The base is provided with a first oil way communicated with the oil cylinder and an oil return oil way communicated with the oil storage cavity; the oil return valve rod mounting channel is designed coaxially with the first oil way, and the diameter of the oil return valve rod mounting channel is larger than that of the first oil way;
The end head of the oil return valve rod is provided with an oil return channel along the axial direction of the oil return valve rod and an oil return hole along the radial direction of the oil return valve rod; the oil return channel is communicated with the oil return way through the oil return hole; the oil return valve rod is fixedly provided with a gasket at the end head of the oil return channel, and the gasket is provided with an oil inlet groove; the oil return valve rod is arranged in the oil return valve rod mounting channel, and an oil return valve cavity is formed between the gasket and the oil return valve rod mounting channel;
a second steel ball is arranged in the oil return channel through a spring, and clearance fit is adopted between the second steel ball and the oil return channel; the oil return channel comprises a large-diameter oil return channel and a small-diameter oil return channel which are coaxially designed, the gasket is arranged at the end head of the large-diameter oil return channel, and the oil return valve cavity is internally provided with a first steel ball; the second steel ball is arranged in the large-diameter oil return channel, and a gap is reserved between the second steel ball and the large-diameter oil return channel; the oil return hole is arranged on the small-diameter oil return channel;
When the oil return valve rod is screwed into the limit position of the oil return valve rod mounting channel, the first steel ball seals the first oil way; meanwhile, under the pressure-bearing condition, when the oil return valve rod is unscrewed, the first steel ball unseals the first oil way, oil enters the oil return valve rod through the first oil way, the second steel ball in the rod is compressed to compress the spring, when the second steel ball seals the small-diameter oil return channel in this state, oil enters the oil return hole through a valve line reserved between the second steel ball and the small-diameter oil return channel, and the first oil way, the oil return valve cavity, the oil return channel and the oil return oil way are communicated.
2. A hydraulic jack with an oil return structure according to claim 1, wherein the gasket is a boss-like gasket.
3. The hydraulic jack with an oil return structure according to claim 1, wherein the gasket is in interference fit with the end of the oil return passage.
4. The hydraulic jack with an oil return structure according to claim 1, wherein the oil return passage is at an acute angle to the first oil passage.
5. The hydraulic jack with an oil return structure according to claim 1, wherein the oil return valve rod mounting channel is in threaded connection with the oil return valve rod; and the tail end of the oil return valve rod in threaded connection is provided with a sealing ring.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011540458.8A CN112573418B (en) | 2020-12-23 | Hydraulic jack with oil return structure | |
| PCT/CN2021/094899 WO2022134445A1 (en) | 2020-12-23 | 2021-05-20 | Hydraulic jack with oil return structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011540458.8A CN112573418B (en) | 2020-12-23 | Hydraulic jack with oil return structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112573418A CN112573418A (en) | 2021-03-30 |
| CN112573418B true CN112573418B (en) | 2024-06-07 |
Family
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101513982A (en) * | 2009-02-18 | 2009-08-26 | 常熟通润汽车零部件股份有限公司 | Oil return structure of hydrostatic trigger |
| CN102826480A (en) * | 2012-08-20 | 2012-12-19 | 常熟通润汽车零部件股份有限公司 | Structurally-improved oil-return device of hydraulic jack |
| CN109052209A (en) * | 2018-10-17 | 2018-12-21 | 常熟通润汽车零部件股份有限公司 | Jack oil-returning structure and jack |
| CN214456462U (en) * | 2020-12-23 | 2021-10-22 | 常熟通润汽车零部件股份有限公司 | Hydraulic jack with oil return structure |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101513982A (en) * | 2009-02-18 | 2009-08-26 | 常熟通润汽车零部件股份有限公司 | Oil return structure of hydrostatic trigger |
| CN102826480A (en) * | 2012-08-20 | 2012-12-19 | 常熟通润汽车零部件股份有限公司 | Structurally-improved oil-return device of hydraulic jack |
| CN109052209A (en) * | 2018-10-17 | 2018-12-21 | 常熟通润汽车零部件股份有限公司 | Jack oil-returning structure and jack |
| CN214456462U (en) * | 2020-12-23 | 2021-10-22 | 常熟通润汽车零部件股份有限公司 | Hydraulic jack with oil return structure |
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