CN202640300U - Novel dual-stage bolt stretcher - Google Patents
Novel dual-stage bolt stretcher Download PDFInfo
- Publication number
- CN202640300U CN202640300U CN2012202615736U CN201220261573U CN202640300U CN 202640300 U CN202640300 U CN 202640300U CN 2012202615736 U CN2012202615736 U CN 2012202615736U CN 201220261573 U CN201220261573 U CN 201220261573U CN 202640300 U CN202640300 U CN 202640300U
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- CN
- China
- Prior art keywords
- oil cylinder
- lower piston
- stage bolt
- piston
- upper oil
- Prior art date
- 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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- Actuator (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
Abstract
The utility model discloses a novel dual-stage bolt stretcher, which comprises an upper oil cylinder, a lower oil cylinder, an upper piston and a lower piston, and the novel dual-stage bolt stretcher is characterized in that a surface D with minimal inner diameter of the upper oil cylinder is transitioned to an upper plane C of inner threads of the upper oil cylinder through a conical surface A. When the dual-stage bolt stretcher is in work, when the lower piston moves upwards to push the upper piston, since the upper oil cylinder is provided with the conical surface A, the lower piston is free from being contacted with the surface C of the upper oil cylinder within a safety stroke range even when the lower piston has machining error or is slightly deformed, i.e. the upper oil cylinder is not pushed upwards, the threaded matching surfaces of the upper oil cylinder and the lower oil cylinder are not damaged, and the upper oil cylinder and the lower oil cylinder are not separated from each other.
Description
Technical field
The utility model relates to a kind of twin-stage bolt tensioning jack.
Background technology
The twin-stage bolt tensioning jack is the utensil of pretension or the nut of dismounting on the high-strength bolt in small space.It without frictionally damage, is the best approach of accurately controlling bolt pretightening to the contact-making surface that connects.Therefore bolt tensioning jack satisfies the high strength of development, the job requirements of high pulling torque bolt requiring tighter applications more extensive to pretightning force.But its existing structure exists certain problem, and as shown in Figure 4, under off working state, upper lower piston 3,4 planes contact, and the lower plane of upper piston 3 is slightly larger than the upper plane of lower piston 4.Lower piston 4 moves upward and promotes upper piston 3 during work, if there is mismachining tolerance in lower piston 3 or slight distortion is arranged, the plane C of upper cylinder 1 will be met in the upper plane of lower piston 3, upper cylinder is executed 1 add thrust upwards, make oil cylinder 1 up and down, 2 threaded engagement face impaired, causing up and down, oil cylinder 1,2 breaks away from.
Summary of the invention
Problem to be solved in the utility model provides a kind of novel twin-stage bolt tensioning jack, and its up and down oil cylinder can not break away from.Simultaneously, it can improve the compression strength of lower piston, prevents the distortion of lower piston.
A kind of novel twin-stage bolt tensioning jack of the utility model, it comprises up and down oil cylinder, upper lower piston, it is characterized in that: pass through conical surface A transition between the upper plane C face of the minimum diameter face D face of upper cylinder and its internal thread.
The twin-stage bolt tensioning jack of this kind structure is when work, when lower piston moves upward the promotion upper piston, because upper cylinder exists conical surface A, even there is mismachining tolerance in lower piston or slight distortion is arranged, lower piston can not contact with the C face of upper cylinder in the scope of safety travel yet, namely can upwards not promote upper cylinder, oil cylinder threaded engagement face is not impaired about can not making, and oil cylinder can not break away from up and down.
Description of drawings
Fig. 1 is the structural representation of this novel twin-stage bolt tensioning jack.
Fig. 2 is the part drawing of this novel middle upper cylinder.
Fig. 3 is the part drawing of this novel middle lower piston.
Fig. 4 is the structural representation of existing twin-stage bolt tensioning jack.
The specific embodiment
From Fig. 1, Fig. 2 as can be known, a kind of novel twin-stage bolt tensioning jack of the utility model, it comprises up and down oil cylinder 1,2, upper lower piston 3,4 wherein, passes through conical surface A transition between the upper plane C face of the minimum diameter face D face of upper cylinder 1 and its internal thread.
Like this when the twin-stage bolt tensioning jack is worked, lower piston 4 moves upward when promoting upper piston 3, even there is mismachining tolerance in lower piston 4 or slight distortion is arranged, because upper cylinder 1 exists conical surface A, guaranteed running space, lower piston 4 can not contact with upper cylinder 1 in the scope of safety travel, namely can upwards not promote upper cylinder 1, can not make up and down oil cylinder 1,2 threaded engagement faces impaired, oil cylinder 1,2 can not break away from up and down.
From Fig. 1, Fig. 3 as can be known, as this novel a kind of improved procedure, pass through conical surface B transition between the upper horizontal plane of lower piston 4 and its external cylindrical surface.Conical surface B on the lower piston 4 can further strengthen running space, has guaranteed that further lower piston 4 can not contact with upper cylinder 1 in the process that moves upward, and making up and down, oil cylinder 1,2 can not break away from; Simultaneously, because the conical surface B on this novel lower piston 4 is larger than the plane E of existing lower piston 4, thereby improve the compression strength of lower piston 4, prevented the distortion of lower piston 4.
Therefore, safe and reliable during this novel twin-stage bolt tensioning jack work, prolonged service life, reduced production cost.
Claims (2)
1. novel twin-stage bolt tensioning jack, it comprises up and down oil cylinder (1,2), upper lower piston (3,4) is characterized in that: pass through conical surface A transition between the upper plane C face of the minimum diameter face D face of upper cylinder (1) and its internal thread.
2. twin-stage bolt tensioning jack according to claim 1 is characterized in that: pass through conical surface B transition between the upper horizontal plane of lower piston (4) and its external cylindrical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202615736U CN202640300U (en) | 2012-06-05 | 2012-06-05 | Novel dual-stage bolt stretcher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202615736U CN202640300U (en) | 2012-06-05 | 2012-06-05 | Novel dual-stage bolt stretcher |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202640300U true CN202640300U (en) | 2013-01-02 |
Family
ID=47409467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202615736U Expired - Fee Related CN202640300U (en) | 2012-06-05 | 2012-06-05 | Novel dual-stage bolt stretcher |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202640300U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170833A (en) * | 2013-03-05 | 2013-06-26 | 马鞍山市三江机械有限公司 | Novel double-level tensioner |
-
2012
- 2012-06-05 CN CN2012202615736U patent/CN202640300U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170833A (en) * | 2013-03-05 | 2013-06-26 | 马鞍山市三江机械有限公司 | Novel double-level tensioner |
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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: 20130102 Termination date: 20150605 |
|
| EXPY | Termination of patent right or utility model |