CN203794543U - Low-speed oil return structure of hydraulic jack - Google Patents
Low-speed oil return structure of hydraulic jack Download PDFInfo
- Publication number
- CN203794543U CN203794543U CN201420177290.2U CN201420177290U CN203794543U CN 203794543 U CN203794543 U CN 203794543U CN 201420177290 U CN201420177290 U CN 201420177290U CN 203794543 U CN203794543 U CN 203794543U
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- China
- Prior art keywords
- oil
- return valve
- bearing pin
- oil return
- fuel
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- Expired - Lifetime
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 230000007774 longterm Effects 0.000 abstract 1
- 230000001603 reducing effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 100
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
A low-speed oil return structure of a hydraulic jack belongs to the technical field of hydraulic lifting devices. The low-speed oil return structure comprises an oil return valve body, an oil return valve rod and a steel ball valve, wherein a first oil way, a second oil way and an oil return valve cavity are arranged on the oil return valve body, one end of the first oil way is communicated with an oil cylinder cavity of an oil cylinder, the other end of the first oil way is communicated with the oil return valve cavity, one end of the second oil way is communicated with an oil storage cavity, the other end of the second oil way is communicated with the oil return valve cavity, the steel ball valve is positioned in the oil return valve cavity and is corresponding to an oil outlet of the first oil way, and a thread gap is reserved between external threads of the oil return valve rod and internal threads of the oil return valve cavity. The low-speed oil return structure has the characteristics that a pin cavity is formed in the axial middle of the oil return valve rod, a pin is arranged in the pin cavity, and the pin and the pin cavity are in clearance fit with each other, so that the pin can slide in the pin cavity; an oil way which is communicated with the pin cavity and the second oil way is further formed in the oil return valve rod. The low-speed oil return structure has the characteristics of simple and reasonable structure, convenience in processing and mounting, long service life, low cost and stable performance, and can ensure slow and balanced load reducing effect for a long term.
Description
Technical field
The utility model belongs to hydraulic pressure lifting device technical field, is specifically related to a kind of oil-returning structure at a slow speed of hydraulic jack, is the improvement to the oil-returning structure at a slow speed of existing hydraulic jack.
Background technology
At present, on market, the oil-returning structure of common hydraulic jack mainly comprises fuel-return valve valve body, fuel-return valve valve rod and steel ball valve, fuel-return valve valve body is articulated with on jack wallboard, on fuel-return valve valve body, offer the first oil circuit communicating for the oil cylinder chamber with hydraulic jack, for the second oil circuit of communicating with the oil storage chamber of hydraulic jack and respectively with first, the steel ball valve valve pocket that the second oil circuit communicates, steel ball valve is positioned at steel ball valve valve pocket, described fuel-return valve valve rod forms and has a stem head in the one end towards steel ball valve valve pocket, this stem head is insinuated in steel ball valve valve pocket, match with steel ball valve, be used for closing or discharging steel ball valve.
When said structure can not ensure unloading, the low balance of load declines, because when unloading, when fuel-return valve valve rod discharges steel ball valve towards deviating from the direction rotation of steel ball valve valve pocket, because the pressure in oil cylinder chamber is significantly greater than the pressure of oil storage chamber, so hydraulic medium just enters oil storage chamber from the first oil circuit, steel ball valve valve pocket and the second oil circuit suddenly successively as hydraulic oil, because hydraulic medium flowing velocity is swift and violent, make load for example vehicle or other similar loaded article decline too soon, exist operator and the unsafe hidden danger of loaded article.
The oil-returning structure (hereinafter referred to as the latter) of the hydraulic jack that a kind of hydraulic part with hydraulic slow release device (hereinafter referred to as the former) that Chinese utility model patent Granted publication CN2721943Y provides and Chinese invention patent application publication number CN101513982A recommend be all around ensureing loaded article slow decreasing, use ensure safety proposed, both are all realized low and being declined by small damping, but but all have defect separately.The defect that the former exists is: 1. aperture easily stops up; 2. its sealing member of realizing soon, changing at a slow speed frequently easily damages when high-low pressure is changed; The latter, compared with the former, has improved above-mentioned defect, but has also brought complex structure, the problem that applicability is wideless simultaneously.
China utility model Granted publication CN201882851U realizes slow decreasing by thread pitch, there is not aperture clogs problem, also the complex structure described in CN101513982A and unsettled problem have been avoided, but by steel ball valve holding device is set in steel ball valve valve pocket, to installation, make troubles, and performance is stable not.
In view of above-mentioned prior art, be necessary the oil-returning structure at a slow speed of existing hydraulic jack to be improved, for this reason, the applicant has done useful design, and technical scheme described below produces under this background.
Summary of the invention
The purpose of this utility model is to provide a kind of simple and reasonable for structure, long service life, and safe, cost is low, the oil-returning structure at a slow speed of the hydraulic jack of stable performance.
The purpose of this utility model reaches like this, a kind of oil-returning structure at a slow speed of hydraulic jack, comprise fuel-return valve valve body, fuel-return valve valve rod and steel ball valve, fuel-return valve valve body pivotal joint is on the wallboard of hydraulic jack, on fuel-return valve valve body, offer the first oil circuit, the second oil circuit and oil return valve pocket, fuel-return valve valve rod matches with the oil return valve pocket negative thread on oil return valve pocket by the fuel-return valve valve rod outside thread of its outer wall, one end of the first oil circuit communicates with the oil cylinder chamber of the oil cylinder of hydraulic jack, the other end of the first oil circuit communicates with oil return valve pocket, one end of the second oil circuit communicates with the oil storage chamber of hydraulic jack, the other end of the second oil circuit communicates with oil return valve pocket, steel ball valve is positioned at oil return valve pocket and corresponding to the oil outlet of the first oil circuit, between described fuel-return valve valve rod outside thread and described oil return valve pocket negative thread, maintain and supplied the slowly thread pitch of circulation of hydraulic medium, be characterized in: described fuel-return valve valve rod offers to entire body bearing pin chamber in the middle of axially, in described bearing pin chamber, be provided with a bearing pin,
Described bearing pin and described bearing pin chamber structure are free-running fit, make the bearing pin can slippage in described bearing pin chamber; On described fuel-return valve valve rod, also offer respectively and described bearing pin chamber, the oil duct that the second oil circuit communicates, described oil return valve pocket is communicated with the second described oil circuit, by described thread pitch, is communicated with the second described oil circuit on the other hand by described bearing pin chamber, oil duct on the one hand.
In a specific embodiment of the present utility model, described bearing pin is straight pin, and correspondingly, the cross sectional shape in described bearing pin chamber is preferably circle.
In another specific embodiment of the present utility model, on described bearing pin, be provided with seal ring.
The technical scheme that the utility model provides is owing to adopting after said structure, the beneficial effect having: simple and reasonable for structure, process easy for installation, long service life, cost is low, stable performance can ensure the slow balance decline effect of load lastingly.
Accompanying drawing explanation
Fig. 1 is the structure cutaway view of the utility model one embodiment.
In figure: 1. fuel-return valve valve body, 11. pivot pins, 12. first oil circuits, 121. oil outlets, 13. second oil circuits, 14. oil return valve pockets, 141. oil return valve pocket negative threads; 2. fuel-return valve valve rod, 21. fuel-return valve valve rod outside threads, 23. oil ducts, 24. bearing pin chambeies; 3. steel ball valve; 4. oil cylinder, 41. oil cylinder chambeies; 5. oil storage chamber; 6. bearing pin; 61. seal rings.
The specific embodiment
For the inspector that the makes Patent Office especially public can be expressly understood technical spirit of the present utility model and beneficial effect more, applicant elaborates the mode with embodiment below, but to the description of embodiment, be not all the restriction to the utility model scheme, any according to the utility model design, done only for pro forma but not substantial equivalent transformation all should be considered as the technical solution of the utility model category.
Refer to Fig. 1, the utility model relates to a kind of oil-returning structure at a slow speed of hydraulic jack, comprises fuel-return valve valve body 1, fuel-return valve valve rod 2, steel ball valve 3 and bearing pin 6.Described fuel-return valve valve body 1 is articulated with on jack wallboard by pivot pin 11, on this fuel-return valve valve body 1, offer the first oil circuit 12, the second oil circuit 13 and oil return valve pocket 14, the oil cylinder chamber 41 of first one end of oil circuit 12 and the oil cylinder of hydraulic jack 4 communicates, the other end of the first oil circuit 12 communicates with oil return valve pocket 14, and second one end of oil circuit 13 and the oil storage chamber of hydraulic jack 5 communicate, the other end of the second oil circuit 13 communicates with oil return valve pocket 14.Described fuel-return valve valve rod 2 screws on fuel-return valve valve body 1, specifically: fuel-return valve valve rod 2 matches with the oil return valve pocket negative thread 141 on oil return valve pocket 14 by the fuel-return valve valve rod outside thread 21 of its outer wall.Described steel ball valve 3 is positioned at oil return valve pocket 14 and corresponding to the oil outlet 121 of the first oil circuit 12, maintains and supplied the slowly thread pitch of circulation of hydraulic medium between described fuel-return valve valve rod outside thread 21 and described oil return valve pocket negative thread 141.The design main points of the technical program are: described fuel-return valve valve rod 2 offers to entire body bearing pin chamber 24 in the middle of axially, in described bearing pin chamber 24, be provided with a bearing pin 6, described bearing pin 6 is free-running fit with described bearing pin chamber 24 structures, make bearing pin 6 in the described interior slippage in bearing pin chamber 24, on described bearing pin 6, be provided with seal ring 61; On described fuel-return valve valve rod 2, also offer respectively and described bearing pin chamber 24, the oil duct 23 that the second oil circuit 12 communicates, described oil return valve pocket 14 is communicated with the second described oil circuit 13, by described thread pitch, is communicated with the second described oil circuit 13 on the other hand by described bearing pin chamber 24, oil duct 23 on the one hand.The cross sectional shape of described bearing pin 6 is unrestricted, can be circular, rectangle or Else Rule/irregularly shaped, is preferably in the present embodiment straight pin, and correspondingly, the cross sectional shape in described bearing pin chamber 24 is preferably circle.
Please continue to refer to Fig. 1, narrate principle of work of the present utility model: when hydraulic jack zero load or underloading oil return, operator unscrews oil return valve rod 2, its reversing sense to the first oil circuit 12 is moved, promote bearing pin 6 simultaneously, removed the restriction of 2 pairs of steel ball valves 3 of fuel-return valve bar, make steel ball valve 3 leave the shutoff to the oil outlet 121 of the first oil duct 12, now the hydraulic medium in the oil cylinder chamber 41 of oil cylinder 4 is that hydraulic oil passes through successively the first oil circuit 12 under the effect of a small amount of pressure, oil outlet 121, oil return valve pocket 14, bearing pin chamber 24, oil duct 23 enters the second oil circuit 13, by the second oil circuit 13, entered in the oil storage chamber 5 of hydraulic jack.Like this, the fluid in the oil cylinder chamber 41 of oil cylinder 4 enters in oil storage chamber 5 swimmingly, has also just realized the object of the normal decline (also claiming fast-descending) of hydraulic jack.When the oil return of hydraulic jack bearing load, operator unscrews oil return valve rod 2, its reversing sense to the first oil circuit 12 is moved, removed the restriction of 2 pairs of steel ball valves 3 of fuel-return valve bar, make steel ball valve 3 leave the shutoff to the oil outlet 121 of the first oil duct 12, now the hydraulic medium in the oil cylinder chamber 41 of oil cylinder 4 is that hydraulic oil is under high pressure, the hydraulic oil coming from the first oil circuit 12 acts on steel ball valve 3, by steel ball valve 3, promote bearing pin 6 to bearing pin chamber 24 intrinsic displacements, because 3 pairs of aforesaid bearing pin chambeies 24 of steel ball valve are now in sealed condition, so the thread pitch that the pressure oil that comes from the first oil circuit 12 can only followed between fuel-return valve valve rod outside thread 21 and oil return valve pocket negative thread 141 by oil return valve pocket 14 enters the second oil circuit 13, by the second oil circuit 13, entered in hydraulic jack oil storage chamber 5.So just control the flow of the pressure oil passing through, thereby realized the object low declining.Realized the technical program and from load behavior to empty (gently), carried the transformation of operating mode, and technique effect is also from low declining and transfer normal decline (fast-descending) to.
Therefore, the technique effect of slow decreasing when the technical scheme that the utility model provides has realized fast-descending when unloaded, load with extremely simple structure, and can automatically adjust descending speed with the variation of load, there is good safety, neither weight can be undermined, also operator can be do not injured.
Claims (3)
1.
a kind of oil-returning structure at a slow speed of hydraulic jack, comprise fuel-return valve valve body (1), fuel-return valve valve rod (2) and steel ball valve (3), fuel-return valve valve body (1) pivotal joint is on the wallboard of hydraulic jack, on fuel-return valve valve body (1), offer the first oil circuit (12), the second oil circuit (13) and oil return valve pocket (14), fuel-return valve valve rod (2) matches with the oil return valve pocket negative thread (141) on oil return valve pocket (14) by the fuel-return valve valve rod outside thread (21) of its outer wall, one end of the first oil circuit (12) communicates with the oil cylinder chamber (41) of the oil cylinder (4) of hydraulic jack, the other end of the first oil circuit (12) communicates with oil return valve pocket (14), one end of the second oil circuit (13) communicates with the oil storage chamber (5) of hydraulic jack, the other end of the second oil circuit (13) communicates with oil return valve pocket (14), steel ball valve (3) is positioned at oil return valve pocket (14) and corresponding to the oil outlet (121) of the first oil circuit (12), between described fuel-return valve valve rod outside thread (21) and described oil return valve pocket negative thread (141), maintain and supplied the slowly thread pitch of circulation of hydraulic medium, it is characterized in that: described fuel-return valve valve rod (2) offers to entire body bearing pin chamber (24) in the middle of axially, in described bearing pin chamber (24), be provided with a bearing pin (6), described bearing pin (6) is free-running fit with described bearing pin chamber (24) structure, make the bearing pin (6) can slippage in described bearing pin chamber (24), on described fuel-return valve valve rod (2), also offer respectively and described bearing pin chamber (24), the oil duct (23) that the second oil circuit (12) communicates, described oil return valve pocket (14) is communicated with described the second oil circuit (13), by described thread pitch, is communicated with described the second oil circuit (13) on the other hand by described bearing pin chamber (24), oil duct (23) on the one hand.
2.
the oil-returning structure at a slow speed of a kind of hydraulic jack according to claim 1, is characterized in that described bearing pin (6) is straight pin, and correspondingly, the cross sectional shape in described bearing pin chamber (24) is preferably circle.
3.
the oil-returning structure at a slow speed of a kind of hydraulic jack according to claim 1 and 2, is characterized in that being provided with seal ring (61) on described bearing pin (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420177290.2U CN203794543U (en) | 2014-04-14 | 2014-04-14 | Low-speed oil return structure of hydraulic jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420177290.2U CN203794543U (en) | 2014-04-14 | 2014-04-14 | Low-speed oil return structure of hydraulic jack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203794543U true CN203794543U (en) | 2014-08-27 |
Family
ID=51376777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420177290.2U Expired - Lifetime CN203794543U (en) | 2014-04-14 | 2014-04-14 | Low-speed oil return structure of hydraulic jack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203794543U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104355262A (en) * | 2014-10-27 | 2015-02-18 | 浙江鑫爱达机械有限公司 | Simple pressure regulating and stable unloading device used for oil return of hydraulic system |
-
2014
- 2014-04-14 CN CN201420177290.2U patent/CN203794543U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104355262A (en) * | 2014-10-27 | 2015-02-18 | 浙江鑫爱达机械有限公司 | Simple pressure regulating and stable unloading device used for oil return of hydraulic system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140827 |