CN207005045U - A kind of nut pre-tightening mechanism - Google Patents
A kind of nut pre-tightening mechanism Download PDFInfo
- Publication number
- CN207005045U CN207005045U CN201720852463.XU CN201720852463U CN207005045U CN 207005045 U CN207005045 U CN 207005045U CN 201720852463 U CN201720852463 U CN 201720852463U CN 207005045 U CN207005045 U CN 207005045U
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- pushing tow
- screw
- bolt
- sector hole
- main
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Abstract
A kind of nut pre-tightening mechanism, including pre-load nut and pad, the main screw coordinated with kingbolt is provided with the center of the pre-load nut, the pushing tow screw of several circumferences is provided with the pre-load nut, the arrangement center of pushing tow screw and main screw center superposition, the rearward end of pre-load nut has a pad, the centre bore concentric with main screw is provided with the pad, the centre bore passes through for kingbolt, also include main pushing tow bolt and time pushing tow bolt, the utility model has jacking force bigger compared with prior art, the advantages that being conveniently adjusted.
Description
Technical field the utility model is related to a kind of mechanical pre-tightening mechanism, more particularly to a kind of nut pretightening machine of pump
Structure.
Background technology bolt connection is one of connected mode main in heavy centrifugal multistage pump multiple centrifugal pump, and rod bolt is due to rule
Lattice are bigger, and the specification with its attaching nut is M60~M80, and difficult to realize using artificial handling, pretightning force also is difficult to control,
If slightly deviation in installation process, can all cause pump that locking phenomenon, traditional fastening occur in start and stop or operation process
The method of rod bolt has driving to tense mechanic's general laws such as spanner method, pneumtic impact wrench method, hydraulic elongator method, hydraulic spanner, this
Outer that electrically heated method is also used on to pump, above method can solve problems, but in practical work process
In, still reached to for the axial pretightening Stability and veracity of nut less than in addition, the cost of above method is higher, operation is not
Just；The patent that China Patent No. is 201520571940.6 discloses a kind of stop nut pushing tow pre-tightening apparatus, and its structure is：Bag
Mother nut is included, the main screw coordinated with kingbolt is provided with the center of the mother nut, several are provided with the mother nut
The pushing tow screw of circumference, the arrangement center of the pushing tow screw and main screw center superposition, it is respectively mounted in each pushing tow screw
There is pushing tow screw rod, the pushing end of the pushing tow screw rod is exposed from mother nut, and the pushing end of pushing tow screw rod is matched somebody with somebody with a pad
Close, be provided with the centre bore concentric with main screw on the pad, the centre bore facilitates the kingbolt to pass through；The spiral shell of this structure
Although female pushing tow pre-tightening apparatus using axial tensile force pretension, avoids screw thread common during bolt connection disorderly button and deadlock phenomenon,
But its pushing tow dynamics is inadequate, and inconvenience adjustment, in use, the pushing tow pre-tightening apparatus of this structure can not especially on pump
Meet work requirements.
Content of the invention the purpose of this utility model is to provide a kind of jacking force bigger, is conveniently adjusted, and install and
The more convenient nut pre-tightening mechanism of operation.
Concrete technical scheme of the present utility model is as follows：
The utility model mainly includes pre-load nut and pad, the pre-load nut and the basic prior art phase of pad
Together, i.e., the main screw coordinated with kingbolt is provided with the center of the pre-load nut, several are provided with the pre-load nut
The pushing tow screw of circumference, the arrangement center of pushing tow screw and main screw center superposition, the rearward end of pre-load nut have one
Individual pad, the centre bore concentric with main screw is provided with the pad, the centre bore passes through for kingbolt；The utility model also wraps
Main pushing tow bolt and time pushing tow bolt are included, each pushing tow screw is two sector holes of front and rear connection, i.e., preceding sector hole is with after
Sector hole, the diameter of preceding sector hole are more than the diameter of rear sector hole, and the inside of the preceding sector hole is provided with main pushing tow bolt, the main pushing tow spiral shell
The head of bolt is stretched out by the leading section of preceding sector hole, and the screw rod of main pushing tow bolt is threadedly coupled with preceding sector hole, the sector hole afterwards it is interior
Portion is provided with time pushing tow bolt, and the head of this pushing tow bolt is placed in preceding sector hole and is in contact with the screw rod of main pushing tow bolt,
The screw rod of secondary pushing tow bolt is threadedly coupled with rear sector hole, the screw rod end of secondary pushing tow bolt stretched out by the rearward end of rear sector hole and with
Pad is in contact.
The utility model can generate powerful jacking force (axial direction), this jacking force by first tightening time pushing tow screw
Acting directly on pad, secondary pushing tow screw friction diameter is small, therefore high jacking force can be realized with relatively small moment of torsion,
In order to realize bigger jacking force, increase a main pushing tow screw again behind secondary pushing tow screw, act on this jacking force
Secondary pretension is realized on secondary pushing tow screw, load is passed to the locking nut main body on the main screw being manually installed into
On, pad is used for transmitting thrust, while protects flange face, (axial direction) jacking force of multiple secondary pushing tow screws and locking nut it is anti-
Generate a powerful clamping force on flange together to active force, the jacking force (axial direction) of main pushing tow screw is in secondary pushing tow spiral shell
Nail on the power for producing a formed objects.
The utility model has the following advantages that compared with prior art：
1. dual pretightning force：Compared with general tightening method, realized on the basis of original powerful pretightning force secondary
Pretension, more insure, while more stable, be easy to implement the regulation of jacking force.
2. rational bolt connection piece：Pretightning force is higher than separating force, and rational design ensures that bolt connection piece will not vibrate
And loosening, save high equipment downtime expense.
3. elastic dilatation：Elastic dilatation enhances the anti-fatigue performance of bolt connection piece.
4. reduce manpower and materials：Only need a people and one common manual wrench can be produced huge bolt pressure, it is complete
Into the work of high intensity.
5. high safety：Because only needing hand-operated tools installation is very safe, avoid and think and use some large hydraulics
The instrument of spanner class is collided when dismounting or the danger of other personal injuries.
6. save space：In confined area, the utility model is more easily installed.
7. save the time：Compared with other most methods, this pre-tightening mechanism can be tightened in the shorter time.Although
There is many pushing tow screw to need to tighten, but more rapidly and will be easier using the time of pneumatic tool installation.
Brief description of the drawings Fig. 1 is main view diagrammatic cross-section of the present utility model.
Fig. 2 is left view schematic diagram of the present utility model.
Next embodiment just elaborates with reference to accompanying drawing to the utility model
A kind of nut pre-tightening mechanism as depicted in figs. 1 and 2, is provided with the center of pre-load nut 1 and kingbolt coordinates
Main screw 101, the rearward end of pre-load nut has a pad 2, the centre bore concentric with main screw is provided with the pad
201, the centre bore is passed through for kingbolt, and the pushing tow screw 3 of 8 circumferences, pushing tow screw are provided with the pre-load nut
Arrangement center and main screw center superposition, each pushing tow screw is two sector holes of front and rear connection, i.e., the preceding He of sector hole 301
Sector hole 302 afterwards, the diameter of preceding sector hole are more than the diameter of rear sector hole, and the inside of the preceding sector hole is provided with main pushing tow bolt 4, the master
The head of pushing tow bolt is stretched out by the leading section of preceding sector hole, and the screw rod of main pushing tow bolt is threadedly coupled with preceding sector hole, the back segment
The inside in hole is provided with time pushing tow bolt 5, before the head of this pushing tow bolt is placed in sector hole and with the screw rod of main pushing tow bolt
Be in contact, the screw rod of secondary pushing tow bolt is threadedly coupled with rear sector hole, the screw rod end of secondary pushing tow bolt by rear sector hole rearward end
Stretch out and be in contact with pad.
Claims (1)
1. a kind of nut pre-tightening mechanism, including pre-load nut and pad, it is provided with the center of the pre-load nut and kingbolt
The main screw coordinated, the pushing tow screw of several circumferences, the arrangement center of pushing tow screw are provided with the pre-load nut
With main screw center superposition, the rearward end of pre-load nut has a pad, be provided with the pad with main screw it is concentric in
Heart hole, the centre bore pass through for kingbolt；It is characterized in that：Also include main pushing tow bolt and time pushing tow bolt, each top
Two sector holes that screw is front and rear connection, i.e., preceding sector hole and rear sector hole are pushed away, the diameter of preceding sector hole is more than the diameter of rear sector hole, described
The inside of preceding sector hole is provided with main pushing tow bolt, and the head of the main pushing tow bolt is stretched out by the leading section of preceding sector hole, main pushing tow spiral shell
The screw rod of bolt is threadedly coupled with preceding sector hole, and the inside of the rear sector hole is provided with time pushing tow bolt, the head of this pushing tow bolt
It is in contact before being placed in sector hole and with the screw rod of main pushing tow bolt, the screw rod of secondary pushing tow bolt is threadedly coupled with rear sector hole, secondary top
The screw rod end for pushing away bolt is stretched out by the rearward end of rear sector hole and is in contact with pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720852463.XU CN207005045U (en) | 2017-07-14 | 2017-07-14 | A kind of nut pre-tightening mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720852463.XU CN207005045U (en) | 2017-07-14 | 2017-07-14 | A kind of nut pre-tightening mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207005045U true CN207005045U (en) | 2018-02-13 |
Family
ID=61454627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720852463.XU Active CN207005045U (en) | 2017-07-14 | 2017-07-14 | A kind of nut pre-tightening mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207005045U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108501617A (en) * | 2018-03-28 | 2018-09-07 | 安徽江淮汽车集团股份有限公司 | A kind of hub bearing retaining mechanism and its application method |
| CN108999867A (en) * | 2018-09-29 | 2018-12-14 | 中国船舶重工集团公司第七0四研究所 | The more pushing tow pre-tightening apparatus of compact |
-
2017
- 2017-07-14 CN CN201720852463.XU patent/CN207005045U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108501617A (en) * | 2018-03-28 | 2018-09-07 | 安徽江淮汽车集团股份有限公司 | A kind of hub bearing retaining mechanism and its application method |
| CN108999867A (en) * | 2018-09-29 | 2018-12-14 | 中国船舶重工集团公司第七0四研究所 | The more pushing tow pre-tightening apparatus of compact |
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