CN203817743U - Hydraulic bolt tensioner - Google Patents
Hydraulic bolt tensioner Download PDFInfo
- Publication number
- CN203817743U CN203817743U CN201420270572.7U CN201420270572U CN203817743U CN 203817743 U CN203817743 U CN 203817743U CN 201420270572 U CN201420270572 U CN 201420270572U CN 203817743 U CN203817743 U CN 203817743U
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- China
- Prior art keywords
- oil
- piston
- pipe interface
- hydraulic bolt
- inlet pipe
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
The utility model discloses a hydraulic bolt tensioner. The hydraulic bolt tensioner comprises a support ring, an oil cylinder, a piston, oil inlet pipe connectors and oil return pipe connectors, wherein the piston is in sliding fit inside the oil cylinder; an oil chamber is formed between the piston and the oil cylinder; the oil inlet pipe connectors are arranged at the top of the piston; safety pressure release valves are mounted at the oil inlet pipe connector parts; the oil return pipe connectors are arranged on the side surface of the piston; unloading valves are mounted at the oil return pipe connector parts. The hydraulic bolt tensioner provided by the utility model not only can prevent the stretching quantity of the bolt from exceeding the amount of elastic deformation, but also can realize the over-travel protection of the piston; the return of the piston can be further realized.
Description
Technical field
The utility model relates to bolt tension instrument, specifically a kind of hydraulic bolt tensioning jack.
Background technology
Hydraulic bolt tensioning jack is the instrument of the large diameter bolt of larger active force that bears for fastening or dismounting, and the oil pressure producing by high-pressure oil pump during work promotes as the piston of extrusion, bolt to be stretched, and makes bolt elongate reach desired deflection.At present, in existing hydraulic bolt tensioning jack use procedure, when high-pressure oil pump continuous firing, entering in-oil cylinder oil pressure continues to increase, when increasing to certain value, oil pressure can make the amount of tension of bolt exceed its elastic deformation amount, cause the bolt failure cannot be fastening or dismounting, in-oil cylinder piston also can skid off oil cylinder because pressure is excessive simultaneously, brings danger.
After bolt tension being completed, the piston of stretcher need to be returned to initial position, stretch convenient next time uses at every turn.The oil cylinder piston return of existing hydraulic bolt tensioning jack mainly contains manually and two kinds of spring self-returns, is manually to adopt manpower circumgyration stretch axle, by the axial force of screw thread rotation generation by piston return, labor intensive; Spring return function is in piston upper end mounting spring, and spring pressurized when stretching completes stretching rear spring release pressure and falls piston and push back original position, if oil pressure is excessive, spring cannot overcome oil cylinder working-pressure, and piston cannot return.
Summary of the invention
For overcoming the deficiencies in the prior art, the utility model provides a kind of hydraulic bolt tensioning jack, can either realize the protection of stroke excessively of piston, can realize again the self-return of piston.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of hydraulic bolt tensioning jack, comprise support ring, oil cylinder, piston, oil inlet pipe interface and oil return pipe interface, described piston is slidably fitted in oil cylinder, between piston and oil cylinder, form oil pocket, described oil inlet pipe interface is located at top land, and oil inlet pipe interface is provided with safety relief valve, described oil return pipe interface is located at piston side, and oil return pipe interface is provided with unloader.
Described oil inlet pipe interface is two.
Described oil return pipe interface is two.
Between described piston and oil cylinder, adopt sealing ring to seal.
Described piston top is provided with driving lever.
Described support ring is provided with driving lever.
The beneficial effects of the utility model are: hydraulic bolt tensioning jack when work, high-pressure oil pump is transported to oil pocket by oil inlet pipe interface by hydraulic oil, and the pressure that oil pocket produces promotes piston and moves up, and as the piston of extrusion, bolt are stretched.When the oil pressure in oil pocket surpasses certain pressure; the safety relief valve of oil inlet pipe interface can be opened automatically; discharge safely internal high pressure oil; make the oil pressure in oil pocket maintain certain force value; the amount of tension that both can prevent bolt exceeds its elastic deformation amount; can avoid again causing piston to skid off oil cylinder because oil pressure is excessive, realize the protection of stroke excessively to piston.When completing when the stretching of bolt is needed to release, open the unloader of oil return pipe interface, in-oil cylinder force value reduces, and in-oil cylinder hydraulic oil is got back in oil pressure fuel tank by oil return pipe, and piston is return under self gravitation.
Adopt the design of two oil-ins and double back hydraulic fluid port, can realize the synchronous fastening stretching to bolt, not only can in parallelly use but also the use of can connecting; When series connection is used, do not need additional configuration oil path distributor just can realize the synchronous use of stretcher.
Between piston and oil cylinder, with sealing ring sealing, can guarantee that piston coordinates with the tight of oil cylinder, can reduce again friction and collision between piston and oil cylinder, strengthen the security reliability of piston and oil cylinder, improve its service life.
Accompanying drawing explanation
Figure is structural representation of the present utility model.
In figure: 1 is support ring, 2 is oil cylinder, and 3 is oil return pipe interface, and 4 is oil pocket, and 5 is piston, and 6 is oil inlet pipe interface, and 7 is driving lever, and 8 is sealing ring, and 9 is driving lever.
The specific embodiment
Below in conjunction with the drawings and the specific embodiments, the utility model is described in further detail.
As shown in the figure, a kind of hydraulic bolt tensioning jack, comprise that support ring 1, oil cylinder 2, piston 5, oil inlet pipe interface 6 and oil return pipe connect 3 mouthfuls, described piston 5 is slidably fitted in oil cylinder 2, between piston 5 and oil cylinder 2, form oil pocket 4, described oil inlet pipe interface 6 is located at piston 5 tops, and oil inlet pipe interface 6 places are provided with safety relief valve, described oil return pipe interface 3 is located at piston 5 sides, and oil return pipe interface 3 places are provided with unloader.
Described oil inlet pipe interface 6 is two.
Described oil return pipe interface 3 is two.
Between described piston 5 and oil cylinder 4, adopt sealing ring 8 to seal.
Described piston 5 tops are provided with driving lever 7.
Described support ring 1 is provided with driving lever 9.
Claims (6)
1. a hydraulic bolt tensioning jack, comprise support ring, oil cylinder, piston, oil inlet pipe interface and oil return pipe interface, it is characterized in that: described piston is slidably fitted in oil cylinder, between piston and oil cylinder, form oil pocket, described oil inlet pipe interface is located at top land, and oil inlet pipe interface is provided with safety relief valve, described oil return pipe interface is located at piston side, and oil return pipe interface is provided with unloader.
2. hydraulic bolt tensioning jack according to claim 1, is characterized in that: described oil inlet pipe interface is two.
3. hydraulic bolt tensioning jack according to claim 1, is characterized in that: described oil return pipe interface is two.
4. according to the hydraulic bolt tensioning jack described in claim 1 or 2 or 3, it is characterized in that: between described piston and oil cylinder, adopt sealing ring to seal.
5. according to the hydraulic bolt tensioning jack described in claim 1 or 2 or 3, it is characterized in that: described piston top is provided with driving lever.
6. according to the hydraulic bolt tensioning jack described in claim 1 or 2 or 3, it is characterized in that: described support ring is provided with driving lever.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420270572.7U CN203817743U (en) | 2014-05-26 | 2014-05-26 | Hydraulic bolt tensioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420270572.7U CN203817743U (en) | 2014-05-26 | 2014-05-26 | Hydraulic bolt tensioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203817743U true CN203817743U (en) | 2014-09-10 |
Family
ID=51473286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420270572.7U Expired - Fee Related CN203817743U (en) | 2014-05-26 | 2014-05-26 | Hydraulic bolt tensioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203817743U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104551640A (en) * | 2014-12-29 | 2015-04-29 | 中国第一重型机械股份公司 | Full-station bolt stretcher |
| CN105328444A (en) * | 2015-11-10 | 2016-02-17 | 北京科路工业装备股份有限公司 | Hydraulic stretching device |
| CN105444658A (en) * | 2015-11-13 | 2016-03-30 | 哈尔滨电机厂有限责任公司 | Hydro-generator coupling bolt elongation value measurement technique |
| CN108007782A (en) * | 2017-12-29 | 2018-05-08 | 襄阳福瑞特机械制造有限公司 | Bolt strength detection device and method |
| CN113664485A (en) * | 2020-05-15 | 2021-11-19 | 国核电站运行服务技术有限公司 | Assembling device for valve cover and piston in nuclear power explosion valve |
-
2014
- 2014-05-26 CN CN201420270572.7U patent/CN203817743U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104551640A (en) * | 2014-12-29 | 2015-04-29 | 中国第一重型机械股份公司 | Full-station bolt stretcher |
| CN104551640B (en) * | 2014-12-29 | 2017-03-08 | 中国第一重型机械股份公司 | Full work station bolt stretching machine |
| CN105328444A (en) * | 2015-11-10 | 2016-02-17 | 北京科路工业装备股份有限公司 | Hydraulic stretching device |
| CN105444658A (en) * | 2015-11-13 | 2016-03-30 | 哈尔滨电机厂有限责任公司 | Hydro-generator coupling bolt elongation value measurement technique |
| CN108007782A (en) * | 2017-12-29 | 2018-05-08 | 襄阳福瑞特机械制造有限公司 | Bolt strength detection device and method |
| CN113664485A (en) * | 2020-05-15 | 2021-11-19 | 国核电站运行服务技术有限公司 | Assembling device for valve cover and piston in nuclear power explosion valve |
| CN113664485B (en) * | 2020-05-15 | 2022-11-01 | 国核电站运行服务技术有限公司 | Assembling device for valve cover and piston in nuclear power explosion valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20170526 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |