CN218408066U - Double-end expansion bolt - Google Patents
Double-end expansion bolt Download PDFInfo
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- CN218408066U CN218408066U CN202222321638.8U CN202222321638U CN218408066U CN 218408066 U CN218408066 U CN 218408066U CN 202222321638 U CN202222321638 U CN 202222321638U CN 218408066 U CN218408066 U CN 218408066U
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- expansion
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- sleeve
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Abstract
The invention discloses a double-end expansion bolt which comprises a bolt body and an expansion sleeve, wherein the rod part of the bolt body consists of an upper polished rod, a threaded rod and a lower polished rod, the lower ends of the upper polished rod and the lower polished rod are respectively provided with an upper conical expansion head and a lower conical expansion head, the inner hole of the expansion sleeve consists of an upper expansion hole, a threaded hole and a lower expansion hole, the upper expansion hole and the lower expansion hole are respectively matched with the upper conical expansion head and the lower conical expansion head, the threaded hole is matched with the threaded rod, and the side walls of the upper expansion hole and the lower expansion hole are respectively and uniformly provided with an upper expansion joint and a lower expansion joint. When the expansion sleeve is used, two ends of the expansion sleeve can be expanded simultaneously, so that the anti-falling effect is greatly improved, and the two ends of the expansion sleeve are in surface contact with the mounting hole, so that the generated friction force is larger, the anti-falling effect is further improved, the safety in use is ensured, and the expansion sleeve can be repeatedly used after being disassembled.
Description
Technical Field
The invention relates to a double-end expansion bolt, and belongs to the technical field of fasteners.
Background
At present, along with the continuous development of fastener trade, the form of expansion screw is various, nevertheless can't break away from the structural style who has three parts of screw, nut and expansion sleeve, receives the extrusion deformation back expansion sleeve of bolt moreover and can't resume by oneself, leads to the expansion bolt after the installation to be difficult to demolish, can damage wall body or ground even, can not accomplish convenient and fast reuse. Therefore, the existing expansion screw has more components, complex structure and high manufacturing cost, or is inconvenient to install, or the expansion sleeve is damaged after installation, so that the expansion screw cannot be reused.
For example, the invention has the granted publication number "CN102852933B", and the invention creates a chinese invention patent named "explosion-proof fastening screw and its anti-skid expansion screw sleeve", which simplifies the structure of the existing expansion bolt, and only has two parts, namely, an anti-skid expansion screw sleeve and a main body screw, and a threaded hole is arranged in the anti-skid expansion screw sleeve, when the main body screw is screwed into the threaded hole of the anti-skid expansion screw sleeve, the tapered surface on the main body screw can prop open the anti-skid expansion screw sleeve, so as to achieve the purpose of expansion and anti-drop; meanwhile, in order to avoid the problem that the antiskid expansion screw sleeve is easy to slip in the mounting hole in the process that the main body screw is screwed into the antiskid expansion screw sleeve, the outer surface of the antiskid expansion screw sleeve is provided with bulges in the shapes of axial convex strips, convex points or convex blocks and the like. However, the anti-skid expansion threaded sleeve is single-end expanded, namely, single-end stressed, when the anti-skid expansion threaded sleeve is subjected to strong pulling force, the anti-skid expansion threaded sleeve still has the possibility of slipping from the inside of the mounting hole, and if the expansion bolt is used as a rock climbing bolt or a ceiling bolt, a large potential safety hazard exists; in addition, the actual contact position of the antiskid expansion thread insert and the mounting hole is an axial bulge, the contact mode is point contact or line contact, the generated friction force is relatively small, and the antiskid expansion thread insert can slip out of the mounting hole.
Disclosure of Invention
In order to solve the technical problems, the invention provides the double-headed expansion bolt which can expand in double heads, so that the anti-falling effect is greatly improved, the expansion sleeve is in surface contact with the mounting hole, the generated friction force is large, the anti-falling effect is further improved, the safety in use is ensured, and the expansion bolt can be repeatedly used after being disassembled.
The invention is formed as follows: the utility model provides a double-end expansion bolt, includes screw body and inflation cover, screw body's pole portion comprises last polished rod, threaded rod and polished rod down, is provided with circular cone expansion head and circular cone expansion head down respectively at the lower extreme of last polished rod and polished rod down, the hole of inflation cover comprises last inflation hole, screw hole and lower inflation hole, last inflation hole and lower inflation hole respectively with last circular cone expansion head and circular cone expansion head cooperation down, screw hole and threaded rod cooperation, on last inflation hole and the lateral wall in lower inflation hole respectively the equipartition have expansion joint and lower expansion joint.
Further, the diameter of the upper polish rod is larger than that of the threaded rod, and the diameter of the threaded rod is larger than that of the lower polish rod.
Furthermore, an upper conical opening matched with the upper conical expansion head is arranged at the orifice of the upper expansion hole, a reducing hole is arranged at the lower end of the lower expansion hole, and a lower conical opening matched with the lower conical expansion head is arranged in the reducing hole.
Further, the length from the lower end of the upper conical expansion head to the lower end of the lower conical expansion head is smaller than the length from the upper end of the upper conical opening to the upper end of the lower conical opening.
Furthermore, it all is provided with four to go up the expansion joint and stretch out or draw back the seam down, and goes up expansion joint and stretch out or draw back the seam dislocation arrangement down.
Furthermore, the outer walls of the upper expansion hole and the lower expansion hole are provided with anti-skid grains.
Due to the adoption of the technical scheme, the invention has the advantages that: when the expansion sleeve is used, two ends of the expansion sleeve can be expanded simultaneously, the anti-falling effect is greatly improved, and the two ends of the expansion sleeve are in surface contact with the mounting hole, so that the generated friction force is large, the anti-falling effect is further improved, the safety in use is ensured, and the expansion sleeve can be repeatedly used after being disassembled.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Description of reference numerals: 1-screw body, 101-upper polish rod, 102-threaded rod, 103-lower polish rod, 104-upper conical expansion head, 105-lower conical expansion head, 2-expansion sleeve, 201-upper expansion hole, 202-lower expansion hole, 203-lower conical opening, 204-lower expansion joint, 205-threaded hole, 206-upper expansion joint, 207-upper conical opening and 208-reducing hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings and embodiments.
Examples
As shown in fig. 1, the double-headed expansion bolt of the invention comprises a bolt body 1 and an expansion sleeve 2, wherein the shank of the bolt body 1 is composed of an upper polish rod 101, a threaded rod 102 and a lower polish rod 103, the diameter of the upper polish rod 101 is larger than that of the threaded rod 102, and the diameter of the threaded rod 102 is larger than that of the lower polish rod 103. The lower ends of the upper polish rod 101 and the lower polish rod 103 are respectively provided with an upper conical expansion head 104 and a lower conical expansion head 105, the inner hole of the expansion sleeve 2 is composed of an upper expansion hole 201, a threaded hole 205 and a lower expansion hole 202, the upper expansion hole 201 and the lower expansion hole 202 are respectively matched with the upper conical expansion head 104 and the lower conical expansion head 105, the threaded hole 205 is matched with the threaded rod 102, and the side walls of the upper expansion hole 201 and the lower expansion hole 202 are respectively and uniformly provided with an upper expansion joint 206 and a lower expansion joint 204. The orifice of the upper expansion hole 201 is provided with an upper conical opening 207 matched with the upper conical expansion head 104, the lower end of the lower expansion hole 202 is a reducing hole 208, and a lower conical opening 203 matched with the lower conical expansion head 105 is arranged in the reducing hole 208. The length from the lower end of the upper conical expansion head 104 to the lower end of the lower conical expansion head 105 is less than the length from the upper end of the upper conical opening 207 to the upper end of the lower conical opening 203. The upper expansion joint 206 and the lower expansion joint 204 are provided with four, and the upper expansion joint 206 and the lower expansion joint 204 are arranged in a staggered manner. Go up and all be provided with anti-skidding line on expansion hole 201 and the lower expansion hole 202 outer wall, when last expansion hole 201 and lower expansion hole 202 opened, can improve the outer wall of last expansion hole 201 and lower expansion hole 202 and the frictional force of mounting hole, effectively prevent expansion sleeve 2 from loosening from the mounting hole, and then improve the reliability when expansion bolts fixes.
The nut and the expansion sleeve are combined into a whole, the two ends of the expansion sleeve 2 are respectively provided with the upper expansion hole 201 and the lower expansion hole 202, the side walls of the upper expansion hole 201 and the lower expansion hole 202 are respectively and uniformly distributed with the upper expansion joint 206 and the lower expansion joint 204, when the screw body 1 is screwed into the expansion sleeve 2, the upper conical expansion head 104 and the lower conical expansion head 105 on the rod part of the screw body 1 are respectively contacted with the upper conical opening 207 of the upper expansion hole 201 and the lower conical opening 203 of the lower expansion hole 202, so that the upper expansion hole 201 and the lower expansion hole 202 are simultaneously expanded and enlarged in the radial direction, the purpose of double-end expansion is achieved, and the anti-falling effect is greatly improved. In addition, in order to prevent the expansion sleeve 2 from slipping in the mounting hole when the screw body 1 is screwed into the expansion sleeve 2, the screw body 1 can be screwed into the expansion sleeve 2 by two thread pitches for pre-tightening before mounting, because the length from the lower end of the upper conical expansion head 104 to the lower end of the lower conical expansion head 105 is less than the length from the upper end of the upper conical opening 207 to the upper end of the lower conical opening 203, namely L1 is less than L2; at the moment, the upper conical expansion head 104 is in contact with the upper conical opening 207, the upper expansion hole 201 is slightly opened, the lower conical expansion head 105 is not in contact with the lower expansion hole 202, and the outer diameter of the lower expansion hole 202 is kept unchanged, so that the screw body 1 and the expansion sleeve 2 which are connected together can be pressed into the mounting hole together, and the operation is convenient and fast; meanwhile, due to the fact that certain friction force exists between the slightly-opened upper expansion hole 201 and the mounting hole, slipping of the expansion sleeve 2 when the screw body 1 is screwed can be avoided, and mounting efficiency is improved.
When the screw is disassembled, only the screw body 1 needs to be rotated reversely, the upper conical expansion head 104 and the lower conical expansion head 105 on the rod part of the screw body 1 are separated from the upper conical opening 207 of the upper expansion hole 201 and the lower conical opening 203 of the lower expansion hole 202 respectively, the outer diameters of the upper expansion hole 201 and the lower expansion hole 202 are restored to the initial sizes, and at the moment, the expansion sleeve 2 and the screw body 1 can be pulled out from the mounting hole together, so that the screw body 1 can be reused conveniently.
Claims (6)
1. The utility model provides a double-end expansion bolts, includes screw body (1) and inflation cover (2), its characterized in that: the screw comprises a screw body (1), wherein the rod part of the screw body (1) is composed of an upper polish rod (101), a threaded rod (102) and a lower polish rod (103), the lower ends of the upper polish rod (101) and the lower polish rod (103) are respectively provided with an upper conical expansion head (104) and a lower conical expansion head (105), the inner hole of an expansion sleeve (2) is composed of an upper expansion hole (201), a threaded hole (205) and a lower expansion hole (202), the upper expansion hole (201) and the lower expansion hole (202) are respectively matched with the upper conical expansion head (104) and the lower conical expansion head (105), the threaded hole (205) is matched with the threaded rod (102), and the side walls of the upper expansion hole (201) and the lower expansion hole (202) are respectively and uniformly provided with an upper expansion joint (206) and a lower expansion joint (204).
2. The expansion stud according to claim 1, wherein: the diameter of the upper polish rod (101) is larger than that of the threaded rod (102), and the diameter of the threaded rod (102) is larger than that of the lower polish rod (103).
3. The expansion stud according to claim 1, wherein: the orifice of the upper expansion hole (201) is provided with an upper conical opening (207) matched with the upper conical expansion head (104), the lower end of the lower expansion hole (202) is a reducing hole (208), and a lower conical opening (203) matched with the lower conical expansion head (105) is arranged in the reducing hole (208).
4. The expansion stud according to claim 3, wherein: the length from the lower end of the upper conical expansion head (104) to the lower end of the lower conical expansion head (105) is less than the length from the upper end of the upper conical opening (207) to the upper end of the lower conical opening (203).
5. The expansion stud according to claim 1, wherein: the upper expansion joint (206) and the lower expansion joint (204) are provided with four, and the upper expansion joint (206) and the lower expansion joint (204) are arranged in a staggered mode.
6. The expansion stud as claimed in claim 1, wherein: and anti-skid grains are arranged on the outer walls of the upper expansion hole (201) and the lower expansion hole (202).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222321638.8U CN218408066U (en) | 2022-09-01 | 2022-09-01 | Double-end expansion bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222321638.8U CN218408066U (en) | 2022-09-01 | 2022-09-01 | Double-end expansion bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218408066U true CN218408066U (en) | 2023-01-31 |
Family
ID=85030621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222321638.8U Active CN218408066U (en) | 2022-09-01 | 2022-09-01 | Double-end expansion bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218408066U (en) |
-
2022
- 2022-09-01 CN CN202222321638.8U patent/CN218408066U/en active Active
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |