CN202517262U - Automatic returning bolt hydraulic pre-tightening device with only one returning spring - Google Patents
Automatic returning bolt hydraulic pre-tightening device with only one returning spring Download PDFInfo
- Publication number
- CN202517262U CN202517262U CN2012200288316U CN201220028831U CN202517262U CN 202517262 U CN202517262 U CN 202517262U CN 2012200288316 U CN2012200288316 U CN 2012200288316U CN 201220028831 U CN201220028831 U CN 201220028831U CN 202517262 U CN202517262 U CN 202517262U
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- tightening device
- returning
- hydraulic pre
- moving spring
- bolt hydraulic
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Abstract
The utility model discloses an automatic returning bolt hydraulic pre-tightening device with only one returning spring. The automatic returning bolt hydraulic pre-tightening device consists of an oil cylinder, a piston, a stretching sleeve and an automatic returning device, wherein the automatic returning device consists of a pressure cover and a returning spring; the returning spring is sleeved on the outer circle of the upper part of the stretching sleeve; the lower end of the returning spring is supported on the upper end surface of the piston; the upper end of the returning spring is pressed and fixed by the lower end surface of the pressure cover; the pressure cover is fixed in an inner hole in the upper part of the oil cylinder; and a long slot is formed on the side surface of the lower part of the oil cylinder without a support ring. The automatic returning bolt hydraulic pre-tightening device is simple in structure and high in operating stability; and the piston is returned automatically and reliably.
Description
Technical field
The utility model relates to the bolt hydraulic pre-tightening device that automatically resets of a back-moving spring of a kind of usefulness, belongs to the bolt hydraulic pre-tightening device and makes the field.
Background technology
At present; State's inner bolt hydraulic pre-tightening device mainly contains two kinds, and a kind of is can not automatically reset plain bolt hydraulic pre-tightening device, after the bolt pretension, needs unitary rotation bolt hydraulic pre-tightening device; Unload it from pretension bolt; Like the patent No. is that ZL201020216973.6 " strong sealing bolt hydraulic elongator " and ZL201020216954.3 " hydraulic bolting device " etc. just belong to this type, and the shortcoming of this type bolt hydraulic pre-tightening device is: mounting or dismounting trouble in the pretension process, inconvenience; Another kind is the bolt hydraulic pre-tightening device that automatically resets; After the bolt pretension; The release back piston can automatically reset under the automatic reset device effect; At this moment only need to rotate expanding sleeve and just can easily whole bolt hydraulic pre-tightening device be unloaded from pretension bolt, it is very convenient to install and remove, and is that ZL201120034627.0 " a kind of bolt hydraulic pre-tightening device that automatically resets " just belongs to this type like the patent No.; Yet also there is the deficiency of following two aspects in this bolt hydraulic pre-tightening device that automatically resets: the one, and complex structure, its automatic reset device need to be divided into around the cylinder cap return pin in the step through hole by many and form with the elastomer that is loaded on the return pin; The 2nd, consistent to elastomeric elastic force requirement; If it is inconsistent; Then piston is in the process of automatically reseting, and is prone to cause decentraction between piston inner hole and the expanding sleeve cylindrical and blocked portion takes place, and piston can not be automatically reset and expanding sleeve can not be unloaded from pretension bolt smoothly; The 3rd, need the corresponding bracing ring of configuration, operational stability is poor.
The utility model content
For overcoming the defective that the existing bolt hydraulic pre-tightening device that automatically resets exists; The utility model provides the bolt hydraulic pre-tightening device that automatically resets of a back-moving spring of a kind of usefulness; It is made up of oil cylinder, piston, expanding sleeve and automatic reset device; It is characterized in that: said automatic reset device is made up of gland and a back-moving spring, and back-moving spring is enclosed within on the cylindrical of expanding sleeve top, and the lower end of back-moving spring is supported on the piston upper surface; The upper end is pushed down it by the gland lower surface fixing, and gland is fixed in the endoporus of oil cylinder top; Said expanding sleeve bottom is provided with the screwed hole that matches with pretension bolt, and top is provided with square hole; Said oil cylinder lower side is provided with elongated slot.
The advantage of the utility model is simple in structure: automatic reset device is only used a back-moving spring, and in the process of automatically reseting, blocked portion can not take place between piston inner hole and the expanding sleeve cylindrical, and it is reliable to automatically reset; The oil cylinder lower side is provided with elongated slot, and without bracing ring, operational stability is good.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Fig. 1 is the utility model vertical section structure figure.
Fig. 2 is the vertical view of Fig. 1.
1. oil cylinders among the figure, 12. elongated slots, 2. piston, 3. expanding sleeve, 31. screwed holes, 32. square holes, 4. automatic reset device, 41. back-moving springs, 42. glands, 5. pretension bolt, 6. pre-load nut, 7. the pretension workpiece one, and 8. the pretension workpiece two.
The specific embodiment
Shown in Figure 1 for the bolt hydraulic pre-tightening device that automatically resets of a back-moving spring of a kind of usefulness.It is made up of oil cylinder 1, piston 2, expanding sleeve 3 and automatic reset device 4.It is characterized in that: said automatic reset device 4 is made up of gland 42 and a back-moving spring 41.Back-moving spring 41 is enclosed within on the expanding sleeve 3 top cylindricals, and the lower end of back-moving spring 41 is supported on the upper surface of piston 2, and the upper end is pushed down it by the lower surface of gland 42 fixing, and gland 42 is fixed in the oil cylinder 1 top endoporus; Said expanding sleeve 3 bottoms are provided with the screwed hole 31 that matches with pretension bolt 5, and top is provided with and can supplies cubic spanner to insert its square hole that turns 32; Said oil cylinder lower side is provided with elongated slot 12, can supply to dial rod and insert and stir pre-load nut 6, thereby whole bolt hydraulic pre-tightening device is without bracing ring, and operational stability is good.
Claims (3)
1. one kind only with the bolt hydraulic pre-tightening device that automatically resets of a back-moving spring; Form by oil cylinder, piston, expanding sleeve and automatic reset device; It is characterized in that: said automatic reset device is made up of gland and a back-moving spring, and back-moving spring is enclosed within on the cylindrical of expanding sleeve top, and the lower end of back-moving spring is supported on the piston upper surface; The upper end is pushed down it by the gland lower surface fixing, and gland is fixed in the endoporus of oil cylinder top.
2. the bolt hydraulic pre-tightening device that automatically resets of a back-moving spring of a kind of usefulness according to claim 1 is characterized in that: said expanding sleeve bottom is provided with the screwed hole that matches with pretension bolt, and top is provided with square hole.
3. the bolt hydraulic pre-tightening device that automatically resets of a back-moving spring of a kind of usefulness according to claim 1 is characterized in that: said oil cylinder lower side is provided with elongated slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200288316U CN202517262U (en) | 2012-01-27 | 2012-01-27 | Automatic returning bolt hydraulic pre-tightening device with only one returning spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200288316U CN202517262U (en) | 2012-01-27 | 2012-01-27 | Automatic returning bolt hydraulic pre-tightening device with only one returning spring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202517262U true CN202517262U (en) | 2012-11-07 |
Family
ID=47100230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200288316U Expired - Lifetime CN202517262U (en) | 2012-01-27 | 2012-01-27 | Automatic returning bolt hydraulic pre-tightening device with only one returning spring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202517262U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245564A (en) * | 2013-05-23 | 2013-08-14 | 巨人通力电梯有限公司 | Chain tensile parameter testing device |
| CN103659251A (en) * | 2013-11-21 | 2014-03-26 | 南通高盛机械制造有限公司 | Automatic resetting stretcher |
| EP2883653A1 (en) * | 2013-12-13 | 2015-06-17 | Hohmann, Jörg | Tensioning device for tensioning a threaded bolt |
| CN110340679A (en) * | 2019-08-01 | 2019-10-18 | 东莞市惠通模具钢材有限公司 | A kind of horizontal thick frame machine precisely processed |
-
2012
- 2012-01-27 CN CN2012200288316U patent/CN202517262U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245564A (en) * | 2013-05-23 | 2013-08-14 | 巨人通力电梯有限公司 | Chain tensile parameter testing device |
| CN103245564B (en) * | 2013-05-23 | 2015-10-28 | 巨人通力电梯有限公司 | A kind of chain tension parameter test device |
| CN103659251A (en) * | 2013-11-21 | 2014-03-26 | 南通高盛机械制造有限公司 | Automatic resetting stretcher |
| EP2883653A1 (en) * | 2013-12-13 | 2015-06-17 | Hohmann, Jörg | Tensioning device for tensioning a threaded bolt |
| CN104708589A (en) * | 2013-12-13 | 2015-06-17 | 弗兰克·霍曼 | Clamping device for expanding a threaded bolt |
| US9744656B2 (en) | 2013-12-13 | 2017-08-29 | Frank Hohmann | Clamping device for expanding a threaded bolt |
| CN104708589B (en) * | 2013-12-13 | 2018-04-10 | 弗兰克·霍曼 | For elongating the tensioning apparatus of bolt |
| CN110340679A (en) * | 2019-08-01 | 2019-10-18 | 东莞市惠通模具钢材有限公司 | A kind of horizontal thick frame machine precisely processed |
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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: 20121107 |