CN105485138B - Pre-tightening bolt assembly - Google Patents
Pre-tightening bolt assembly Download PDFInfo
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- CN105485138B CN105485138B CN201410531108.3A CN201410531108A CN105485138B CN 105485138 B CN105485138 B CN 105485138B CN 201410531108 A CN201410531108 A CN 201410531108A CN 105485138 B CN105485138 B CN 105485138B
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- cavity
- screw rod
- push rod
- rod
- resistance wire
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Abstract
The invention discloses a pre-tightening bolt assembly, which comprises a bolt body and a nut matched with the bolt body, wherein a cavity is formed in a screw rod of the bolt body, the depth of the cavity is greater than that of the screw rod, an internal thread is arranged at the end part of the cavity, the pre-tightening bolt assembly also comprises a push rod which is arranged in the cavity in a penetrating manner, a threaded part matched with the internal thread is arranged at the other end of the push rod, the length of the push rod is greater than that of the cavity, a tightening end used for twisting the push rod is also arranged at the end part of the threaded part, a heating resistance wire is wound on the push rod, and the heating resistance wire. According to the invention, the cavity is formed in the screw rod, the ejector rod is arranged in the cavity, when the screw rod is used, the screw rod is heated by the heating resistance wire, the screw rod expands and extends under heating, the screw rod is stretched to generate elastic deformation through the matching of the internal thread and the thread part, then the nut and the screw rod are screwed, and after the ejector rod is loosened, the pretightening force of the nut and the screw rod is greatly improved.
Description
Technical Field
The invention relates to the technical field of bolts, in particular to a pre-tightening bolt assembly.
Background
In large-scale presses and large-scale engineering machinery, bolts are needed to be used for connecting large parts such as columns, workbenches and the like. At present, all parts are usually connected by large bolts, but the large bolts are pre-tightened, so that the pre-tightening force requirement is extremely high, and a reliable and feasible method is not available.
Disclosure of Invention
The invention mainly solves the technical problems in the prior art, and provides a pre-tightening bolt assembly capable of effectively improving the pre-tightening force of a bolt.
The technical problem of the invention is mainly solved by the following technical scheme:
the invention discloses a pre-tightening bolt assembly, which comprises a bolt body and a nut matched with the bolt body, wherein a cavity is formed in a screw rod of the bolt body, the depth of the cavity is greater than the length of the screw rod, an internal thread is arranged at the end part of the cavity, the pre-tightening bolt assembly also comprises a push rod penetrating the cavity, one end of the push rod is used for pushing the bottom of the cavity tightly, the other end of the push rod is provided with a threaded part matched with the internal thread, the length of the push rod is greater than the depth of the cavity, the end part of the threaded part is also provided with a tightening end used for twisting the push rod, a heating resistance wire is wound on the push rod, and the heating resistance wire is connected with a wiring end after penetrating through the threaded.
Further, an electric brush slip ring is arranged between the heating resistance wire and the wiring terminal, and the electric brush slip ring is connected with the screwing end.
Further, the bottom of the cavity is conical, and the end of the ejector rod is spherical.
Furthermore, a spiral groove is formed in the ejector rod, and the heating resistance wire is wound in the spiral groove.
Compared with the prior art, the invention has the advantages that: through opening the cavity in the screw rod to set up the ejector pin in the cavity, when using, through heating resistance wire heating screw rod, the screw rod is heated the expansion and extension, and through the cooperation of internal thread and screw portion with the tensile elastic deformation that produces of screw rod, then screw up nut and screw rod, loosen after the ejector pin, the pretightning force of nut and screw rod improves greatly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a pretensioning bolt assembly according to the present invention;
fig. 2 is a partial enlarged view at I in fig. 1.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
Referring to fig. 1 and 2, the pre-tightening bolt assembly of the present invention includes a bolt body 1 and a nut 2 matched with the bolt body, a cavity 12 is opened in a screw 11 of the bolt body 1, a depth of the cavity 12 is greater than a length of the screw 11, an internal thread 13 is provided at an end of the cavity 12, and a push rod 3 inserted into the cavity 12, one end of the push rod 3 is used for pushing against a bottom of the cavity 12, a thread portion 31 matched with the internal thread 13 is provided at the other end of the push rod 3, the length of the push rod 3 is greater than the depth of the cavity 12, an end of the thread portion 31 is further provided with a tightening end 32 for twisting the push rod 3, the push rod 3 is conveniently tightened by the tightening end 32, and the tightening end 32 may be made into a hexagonal head shape, a square shape, or a transverse through hole or. Through setting up cavity 12 in screw rod 11 to set up ejector pin 3 in cavity 12, when using, through the cooperation of internal thread 13 on the screw rod 11 and the screw portion 31 on the ejector pin 3 and screw up, tensile production elastic deformation with screw rod 11, then screw up nut 2 with screw rod 11, after loosening and taking out ejector pin 3, the pretightning force of nut and screw rod 11 improves greatly, and this ejector pin 3 can use many times. And the heating resistance wire 4 is wound on the mandril 3, and the heating resistance wire 4 is connected with the wiring terminal 5 after passing through the thread part 31 and the tightening end 32. The screw 11 of the bolt body 1 is heated through the resistance wire 4, the screw 11 expands and extends, and after the nut is screwed down, the screw 11 contracts when being cooled to normal temperature, so that the pretightening force of the bolt is further improved.
Preferably, a brush slip ring 33 is further provided between the heating resistance wire 4 and the terminal 5, and the brush slip ring 33 is connected with the tightening end 32. When the push rod 3 is screwed by the brush slip ring 33, the purpose of the brush slip ring 33 is that the circuit of the terminal 5 is not twisted when the push rod 3 is screwed. Optimally, the bottom of the cavity 12 is conical, the end part of the ejector rod 3 is spherical, the ejector rod 3 is in line contact with the bottom of the cavity 12, and the ejector rod 3 is small in friction force during rotation and convenient to screw. The ejector rod 3 is provided with a spiral groove 34, and the heating resistance wire 4 is wound in the spiral groove 34. The spiral groove 34 can protect the heating resistance wire 4 from being extruded to the side wall of the cavity 12, and prevent the heating resistance wire 4 from being damaged by extrusion.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (1)
1. A pre-tightening bolt assembly, comprising: the bolt comprises a bolt body (1) and a nut (2) matched with the bolt body, wherein a cavity (12) is formed in a screw rod (11) of the bolt body (1), the depth of the cavity (12) is larger than the length of the screw rod (11), an internal thread (13) is arranged at the end part of the cavity (12), the bolt further comprises a push rod (3) which is arranged in the cavity (12) in a penetrating manner, one end of the push rod (3) is used for tightly pushing against the bottom of the cavity (12), the other end of the push rod (3) is provided with a thread part (31) matched with the internal thread (13), the length of the push rod (3) is larger than the depth of the cavity (12), the end part of the thread part (31) is further provided with a screwing end (32) used for twisting the push rod (3), a heating resistance wire (4) is wound on the push rod (3), and the heating resistance wire (4) penetrates through the thread part (31) and the screwing end (32) and then is connected with a wiring; an electric brush slip ring (33) is further arranged between the heating resistance wire (4) and the wiring terminal (5), and the electric brush slip ring (33) is connected with the screwing end (32); the bottom of the cavity (12) is conical, and the end part of the ejector rod (3) is spherical; the heating device is characterized in that the ejector rod (3) is provided with a spiral groove (34), the heating resistance wire (4) is wound in the spiral groove (34), and the diameter of the ejector rod (3) is smaller than the inner diameter of the cavity (12), so that the heating resistance wire (4) in the spiral groove (34) is not in contact with the inner wall of the cavity (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410531108.3A CN105485138B (en) | 2014-10-09 | 2014-10-09 | Pre-tightening bolt assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410531108.3A CN105485138B (en) | 2014-10-09 | 2014-10-09 | Pre-tightening bolt assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105485138A CN105485138A (en) | 2016-04-13 |
| CN105485138B true CN105485138B (en) | 2019-12-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410531108.3A Active CN105485138B (en) | 2014-10-09 | 2014-10-09 | Pre-tightening bolt assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105485138B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106286533A (en) * | 2015-05-22 | 2017-01-04 | 凤冈县凤鸣农用机械制造有限公司 | A kind of pretension bolt assembly |
| CN106391742A (en) * | 2016-11-21 | 2017-02-15 | 考迈托（佛山）挤压科技股份有限公司 | Extruder pull rod structure and installation method |
| CN109773104B (en) * | 2019-01-30 | 2020-01-14 | 荣成华东锻压机床股份有限公司 | Mechanical press screw sleeve fastening device and method |
| CN109798296B (en) * | 2019-01-30 | 2019-11-29 | 荣成华东锻压机床股份有限公司 | A kind of clamp device and method on mechanical press |
| CN109676989B (en) * | 2019-01-30 | 2020-01-14 | 荣成华东锻压机床股份有限公司 | Fastening device for crankshaft connecting rod of mechanical press |
| CN110107581B (en) * | 2019-04-30 | 2020-10-09 | 西京学院 | Anti-loose fastening device and using method thereof |
| CN110966296A (en) * | 2019-12-27 | 2020-04-07 | 南京金鑫传动设备有限公司 | Bolt sleeve and connection anti-loosening method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1839016A (en) * | 2003-08-22 | 2006-09-27 | 乔格·霍曼 | Double nut for the controlled tightening of a part by means of a screw connection |
| CN201125921Y (en) * | 2007-12-19 | 2008-10-01 | 太原重工股份有限公司 | Pretension device of large diameter bolt connection |
| CN201866055U (en) * | 2010-10-20 | 2011-06-15 | 吉林省元隆达工装设备有限公司 | Internal high-pressure forming machine and connecting piece thereof |
| CN102230490A (en) * | 2011-06-27 | 2011-11-02 | 无锡西姆莱斯石油专用管制造有限公司 | Bolt convenient to pre-compress and dedicated pre-compressing method |
| CN203809472U (en) * | 2013-12-06 | 2014-09-03 | 天水锻压机床(集团)有限公司 | Pre-tightening bolt set for connection of large parts |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042502B (en) * | 2011-10-17 | 2015-05-13 | 华锐风电科技(集团)股份有限公司 | Foundation bolt pretightening force exerting method |
-
2014
- 2014-10-09 CN CN201410531108.3A patent/CN105485138B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1839016A (en) * | 2003-08-22 | 2006-09-27 | 乔格·霍曼 | Double nut for the controlled tightening of a part by means of a screw connection |
| CN201125921Y (en) * | 2007-12-19 | 2008-10-01 | 太原重工股份有限公司 | Pretension device of large diameter bolt connection |
| CN201866055U (en) * | 2010-10-20 | 2011-06-15 | 吉林省元隆达工装设备有限公司 | Internal high-pressure forming machine and connecting piece thereof |
| CN102230490A (en) * | 2011-06-27 | 2011-11-02 | 无锡西姆莱斯石油专用管制造有限公司 | Bolt convenient to pre-compress and dedicated pre-compressing method |
| CN203809472U (en) * | 2013-12-06 | 2014-09-03 | 天水锻压机床(集团)有限公司 | Pre-tightening bolt set for connection of large parts |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105485138A (en) | 2016-04-13 |
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Effective date of registration: 20201123 Address after: 277000 Yongfu South Road, Xuecheng District, Zaozhuang City, Shandong Province (Xuecheng Industrial Park) Patentee after: Zaozhuang Shunxiang Technology Development Co.,Ltd. Address before: Changzheng Town Village in Guizhou Province in Honghuagang District of Zunyi City, 563000 Patentee before: Zunyi Zunhong Screw Factory |
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| TR01 | Transfer of patent right |