CN217558725U - Expansion bolt - Google Patents
Expansion bolt Download PDFInfo
- Publication number
- CN217558725U CN217558725U CN202221806047.3U CN202221806047U CN217558725U CN 217558725 U CN217558725 U CN 217558725U CN 202221806047 U CN202221806047 U CN 202221806047U CN 217558725 U CN217558725 U CN 217558725U
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- CN
- China
- Prior art keywords
- expansion sleeve
- adjusting block
- shaft core
- expansion
- hole
- 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.)
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Abstract
The utility model discloses an expansion bolt, which comprises a shaft core, an adjusting block, an expansion sleeve and an adjusting nut, wherein one end of the shaft core is provided with a step, the other end of the shaft core is provided with an external thread, the adjusting block is provided with a shaft hole and is in a conical shape with a small outer diameter and a large outer diameter, and the adjusting block is sleeved on the shaft core through the shaft hole; the inner hole of the expansion sleeve is matched with the adjusting block, one end of the expansion sleeve is fixed with the step of the shaft core, the other end of the expansion sleeve is sleeved on the adjusting block, a plurality of expansion grooves are axially formed in the expansion sleeve, and the adjusting nut is arranged on the shaft core in a threaded fit mode and abuts against the expansion sleeve. The expansion bolts are firstly installed in a pair of bored and finished flange holes and are tensioned to ensure that the coaxiality between the pair of flange holes and the two segmental crankshafts cannot be changed due to the rotation of the next flange hole to be machined.
Description
Technical Field
The utility model belongs to flange fastener, concretely relates to expansion bolts.
Background
As shown in fig. 1, in the manufacturing process of the large marine butt-jointed crankshaft in the prior art, all flange holes 2 of the connecting flanges 1 of two crankshaft sections need to be sequentially rotated to a processing position for paired boring and finish machining, and are spliced one by one through bolts. However, there is a gap between the common connecting bolt and the flange hole 2, and even if the connecting bolt is screwed tightly, when the next flange hole 2 is machined after rotation, the coaxiality between the two connecting flanges 1 is still deviated, so that the precision of boring finish machining cannot be ensured.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an expansion bolt is provided, the flange hole after the processing and the axiality between two flange can be guaranteed.
In order to solve the technical problem, the utility model discloses a following technical scheme:
an expansion bolt comprises a shaft core, an adjusting block, an expansion sleeve and an adjusting nut, wherein one end of the shaft core is provided with a step, the other end of the shaft core is provided with an external thread, the adjusting block is provided with a shaft hole and is conical, the outer diameter of the adjusting block is small, the inner diameter of the adjusting block is small, the outer diameter of the adjusting block is large, and the adjusting block is sleeved on the shaft core through the shaft hole; the inner hole of the expansion sleeve is matched with the adjusting block, one end of the expansion sleeve is fixed with the step of the shaft core, the other end of the expansion sleeve is sleeved on the adjusting block, a plurality of expansion grooves are axially formed in the expansion sleeve, and the adjusting nut is arranged on the shaft core in a threaded fit mode and abuts against the expansion sleeve.
The contact surface between the expansion sleeve and the adjusting block is at least 80%.
Adopt the utility model discloses an expansion bolt has following advantage:
1. the expansion bolt of the utility model is firstly arranged in a pair of flange holes which are bored and finished, and is tensioned to ensure that the coaxiality between the pair of flange holes and the two segmental crankshafts can not be changed due to the rotation of the next flange hole which needs to be processed;
2. the expansion bolts and the connecting bolts are sequentially and alternately installed, so that the coaxiality in the whole splicing process can be ensured.
Drawings
The following detailed description of the present invention is made with reference to the accompanying drawings and the embodiments:
FIG. 1 is a perspective view of a two-sectioned crankshaft used for crankshaft splicing in an opposing arrangement;
fig. 2 is a cross-sectional view of the expansion bolt of the present invention;
fig. 3 is a schematic structural view of the expansion sleeve of the present invention;
FIG. 4 is a schematic structural diagram of a connecting bolt used for flange splicing;
fig. 5 and 6 are perspective views of the expansion bolts and the connecting bolts of the present invention installed in the connecting flange at different viewing angles.
Detailed Description
The expansion bolt of the utility model is shown in fig. 2-3, and comprises a shaft core 51, an adjusting block 52, an expansion sleeve 53 and an adjusting nut 54, wherein one end of the shaft core 51 is provided with a step 56, the other end is provided with an external thread, the adjusting block 52 is provided with a shaft hole and is in a conical shape with a small outer diameter and a large outer diameter, and is sleeved on the shaft core 51 through the shaft hole; the inner hole of the expansion sleeve 53 is matched with the adjusting block 52, one end of the inner hole is fixed with the step of the shaft core 51, the other end of the inner hole is sleeved on the adjusting block 52, the contact surface of the expansion sleeve 53 and the adjusting block 52 at least reaches 80%, the expansion sleeve 53 is further axially provided with a plurality of expansion grooves 55, and the adjusting nut 54 is arranged on the shaft core 51 in a threaded fit manner and is abutted against the expansion sleeve 53.
As shown in fig. 5-6, during the use, the relative setting of two subsection bent axles that will need the concatenation and rotatory arbitrary a pair of flange hole 2 to boring cutter position that makes its flange 1, after adjusting the axiality, carry out bore hole finish machining to this pair of flange hole 2, then will the utility model discloses an expansion bolts 5 is packed into this pair of flange hole 2, and rethread is twisted adjusting nut 54 and is made adjusting block 52 and cover 53 relative slip that rises, and the cover 53 that rises is made to expand through the effect of conical surface to rise tightly 2 in the lump with two flange holes, be difficult to take place to shift between two flange 1 that make, take place to squint with the axiality that reduces the rotatory in-process to boring cutter position of next pair of flange hole 2, also guaranteed the coaxial precision of flange hole 2 processing simultaneously. Alternatively, the entire ring of flange holes 2 may be assembled using expansion bolts 5 and connecting bolts 6 (see fig. 4) as shown in fig. 5 and 6 to complete the crank shaft assembly.
However, those skilled in the art should realize that the above embodiments are only used for illustrating the present invention and not used as a limitation of the present invention, and that the changes and modifications to the above embodiments are within the scope of the appended claims as long as they are within the true spirit of the present invention.
Claims (2)
1. An expansion bolt, characterized in that: the adjustable shaft comprises a shaft core, an adjusting block, an expansion sleeve and an adjusting nut, wherein one end of the shaft core is provided with a step, the other end of the shaft core is provided with an external thread, the adjusting block is provided with a shaft hole and is in a conical shape with a small outer diameter and a large outer diameter, and the adjusting block is sleeved on the shaft core through the shaft hole; the inner hole of the expansion sleeve is matched with the adjusting block, one end of the expansion sleeve is fixed with the step of the shaft core, the other end of the expansion sleeve is sleeved on the adjusting block, a plurality of expansion grooves are axially formed in the expansion sleeve, and the adjusting nut is arranged on the shaft core in a threaded fit mode and abuts against the expansion sleeve.
2. An expansion bolt according to claim 1, wherein: the contact surface of the expansion sleeve and the adjusting block is at least 80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221806047.3U CN217558725U (en) | 2022-07-13 | 2022-07-13 | Expansion bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221806047.3U CN217558725U (en) | 2022-07-13 | 2022-07-13 | Expansion bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217558725U true CN217558725U (en) | 2022-10-11 |
Family
ID=83504050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221806047.3U Active CN217558725U (en) | 2022-07-13 | 2022-07-13 | Expansion bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217558725U (en) |
-
2022
- 2022-07-13 CN CN202221806047.3U patent/CN217558725U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |