CN220566389U - Screw thread connection pre-tightening structure - Google Patents
Screw thread connection pre-tightening structure Download PDFInfo
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- CN220566389U CN220566389U CN202322305845.9U CN202322305845U CN220566389U CN 220566389 U CN220566389 U CN 220566389U CN 202322305845 U CN202322305845 U CN 202322305845U CN 220566389 U CN220566389 U CN 220566389U
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- tensioning
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- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 125000006850 spacer group Chemical group 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a pre-tightening structure for threaded connection, which relates to the field of mechanical connection and comprises a first connecting piece, a second connecting piece and a threaded connecting piece, wherein connecting holes are formed in corresponding positions of the first connecting piece and the second connecting piece, the rod part of the threaded connecting piece is arranged in the connecting holes in a penetrating mode, the head part of the threaded connecting piece is supported on the first connecting piece or the second connecting piece through a gasket, a tensioning screw hole is formed in the head part of the threaded connecting piece and is placed in the tensioning screw hole, so that the tensioning screw hole is tightly pressed by the tensioning screw, the axis O1 of the tensioning screw hole is obliquely arranged relative to the axis O of the threaded connecting piece, and the axis O1 of the tensioning screw hole is parallel to the axis O of the threaded connecting piece after the tensioning screw hole is stressed and deformed. According to the utility model, the deformation of the nut body is measured through calculation and test, the tensioning screw hole on the nut body is pre-processed to be inwards inclined, the tensioning screw hole is parallel to the stud after being stressed and deformed, the stress of the contact surface of the tensioning screw and the gasket is effectively improved, and the screw tooth stress state between the tensioning screw and the nut body is improved.
Description
Technical Field
The utility model relates to the field of mechanical connection, in particular to a pre-tightening structure of threaded connection.
Background
Two or more mechanical joints with threaded connection are needed to be pre-tightened by high-strength bolts and the like in many occasions, and the method mainly comprises the following steps:
1. after the wrench is in place on the hexagonal bolt head, the wrench handle is hit by the heavy hammer, and the method is practical in certain occasions, but cannot control the torque, so that the pretightening force is small, the occupied space is large during installation, the wrench is only suitable for nuts with small specification, the operation is dangerous, and the labor intensity is high.
2. The stud body is preheated to be elongated, then the nut is installed, and the pre-tightening is realized after the stud body is cooled and contracted. But its amount of shrinkage is mainly consumed by the gaps between the fittings in the relaxed state. The disassembly is troublesome, and the pretightening force is controlled inaccurately.
3. The hydraulic tensioning nut is adopted, special equipment with expensive responsibility is required to be prepared, a large installation space is occupied, the pretightening force which can be achieved is relatively low, and the pretightening value is difficult to control.
4. Tightening the nut with a torque multiplier in such a way that only 10% -15% of the energy is used for the elongation of the bolt; while most is lost to friction. When the torque valve is used, the torque value is difficult to control, and the threads are easy to damage; disassembly is more problematic. In addition, the torque multiplier has the technical problems of heavy weight, difficult operation, high energy consumption, high sleeve price and the like.
The pretension nut is more and more widely used due to the advantages of convenient tensioning, vertical stretching of the screw rod and the like. However, the existing pretensioned nuts have some problems in use: after the tensioning screw is screwed down, the lower end of the nut body can be outwards expanded and deformed under the stress state, and although the stress distribution of the stud and the nut body can be effectively improved, the lower end of the tensioning screw can be bent along with the deformation of the nut body, and meanwhile the gasket also constrains the tensioning screw. On the one hand, the stress of the contact surface of the tensioning screw and the gasket is uneven, and the contact surface is easy to damage; on the other hand, uneven compression of the thread between the tension screw and the nut body occurs, thereby causing damage to the thread of the tension screw.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and provides a screw thread connection pre-tightening structure, wherein the deformation of a screw body is measured through calculation and test, a tensioning screw hole on the screw body is pre-processed to be inwards inclined, the tensioning screw hole is parallel to a stud after stress deformation, the stress of the contact surface of a tensioning screw and a gasket is effectively improved, and the stress state of a screw thread between the tensioning screw and the screw body is improved.
The utility model aims at being completed by the following technical scheme: the pre-tightening structure for threaded connection comprises a first connecting piece, a second connecting piece and a threaded connecting piece, wherein connecting holes are formed in corresponding positions of the first connecting piece and the second connecting piece, the rod portion of the threaded connecting piece is arranged in the connecting holes in a penetrating mode, the head portion of the threaded connecting piece is supported on the first connecting piece or the second connecting piece through a gasket, a plurality of tensioning screw holes are formed in the head portion of the threaded connecting piece and used for being placed in tensioning screws, the tensioning screws are used for pressing the gasket, the axis O1 of the tensioning screw holes is inclined relative to the axis O of the threaded connecting piece, and the axis O1 of the tensioning screw holes is just parallel to the axis O of the threaded connecting piece after the tensioning screw holes are stressed and deformed.
As a further technical scheme, the gaskets are arranged in an inclined mode with high outside and low inside, and when the heads of the threaded connecting pieces deform under stress, the tensioning screws are perpendicular to the surfaces of the gaskets.
As a further technical scheme, the tensioning screw holes are uniformly distributed on the periphery of the rod part of the threaded connecting piece along the circumferential direction, and one or more circles of tensioning screw holes are arranged.
As a further technical scheme, the head of the threaded connecting piece is a nut body, the rod of the threaded connecting piece is a stud, and the stud penetrates through the nut body, the first connecting piece and the second connecting piece.
As a further technical scheme, the threaded connecting piece is a bolt, the tensioning screw hole is formed in the head of the bolt, and the rod portion of the bolt penetrates into the connecting holes of the first connecting piece and the second connecting piece.
The beneficial effects of the utility model are as follows:
1. the inclination amount is processed in the tensioning screw hole in advance, and the deformation amount generated after the tensioning screw hole is stressed can be counteracted, so that the tensioning screw hole is ensured to be parallel to the stud (the bolt rod part) after the tensioning screw hole is installed;
2. the gasket can be processed into an inclination amount in advance, and the deformation amount generated after the head of the threaded connecting piece is stressed can be counteracted, so that the tensioning screw is perpendicular to the surface of the gasket after installation;
3. the tensioning screw is provided with one or more turns, and can provide enough pretightening force;
4. the nut and bolt connecting structure can be applied to the connecting structure of the nut and the bolt and the structure of the bolt connection, and the application range is wider.
Drawings
Fig. 1 is a schematic diagram of an assembly structure of embodiment 1 in the present utility model.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a schematic structural view of the tensioning screw hole after the inclination angle is set.
Fig. 4 is a schematic structural view of the gasket after the inclination angle is set.
Fig. 5 is a schematic diagram showing an assembly structure of embodiment 2 of the present utility model.
Reference numerals illustrate: the first connecting piece 1, the second connecting piece 2, the gasket 3, the tensioning screw 4, the tensioning screw hole 41, the nut body 5, the stud 6, the bolt 7, the bolt head 71, the bolt rod 72 and the connecting hole 8.
Detailed Description
The utility model will be described in detail below with reference to the attached drawings:
example 1: as shown in fig. 1 to 4, the screw-coupled pretensioning structure comprises a first connecting member 1, a second connecting member 2, a gasket 3, a tensioning screw 4, a tensioning screw hole 41, a nut body 5, a stud 6 and a connecting hole 8.
The first connecting piece 1 and the second connecting piece 2 are provided with connecting holes 8, and the connecting holes 8 of the first connecting piece 1 and the second connecting piece 2 are aligned when being assembled. As shown in fig. 1, one end of a stud 6 is screwed into the nut body 5 (as a screw-threaded connector), and the other end of the stud 6 penetrates into the connecting hole 8 to screw-connect the first connector 1 and the second connector 2. A washer 3 is provided between the nut body 5 and the second connector 2 (or the first connector 1), and a stud 6 passes through the washer 3. Further, as shown in fig. 2, a plurality of tensioning screw holes 41 are uniformly formed along the circumferential direction of the nut body 5, and the tensioning screw holes 41 may be formed in one circle or in a plurality of circles. A tensioning screw 4 is screwed in each tensioning screw hole 41, and the lower end face of the tensioning screw 4 abuts against the upper end face of the gasket 3, so that the gasket 3 is pressed against the second connecting piece 2.
Further, as shown in fig. 3, the axis O1 of the tightening screw hole 41 is disposed obliquely (preferably, the inclination angle λ=1°) with respect to the axis O of the stud 6, and as shown in fig. 1, when the tightening screw hole 41 is deformed under the assembly stress, the axis O1 is exactly parallel to the axis O of the stud 6.
As shown in fig. 4, as an alternative solution, the spacer 3 may be arranged with a high outside and a low inside (i.e. the upper end surface of the spacer 3 is set to be a curved surface, preferably, the inclination delta=1°), and as shown in fig. 1, when the nut body 5 is deformed under force, the lower end surface of the tensioning screw 4 is exactly perpendicular to the upper end surface of the spacer 3. The stress on the contact surface of the tensioning screw 4 and the gasket 3 is effectively improved, and the stress state of the screw teeth between the tensioning screw 4 and the nut body 5 is improved.
Example 2: as shown in fig. 5, the difference from embodiment 1 is that a bolt 7 is used as a screw connection, a bolt head 71 corresponds to the nut body 5 in embodiment 1, and a bolt shank 72 corresponds to the stud 6 in embodiment 1. The tensioning screw hole 41 is provided in the bolt head 71, and the bolt shank 72 penetrates into the connecting hole 8 of the first connecting member 1 and the second connecting member 2. Likewise, the tensioning screw hole 41 is of an inclined design, and the spacer 3 may be of a curved design.
According to the utility model, the deformation of the nut body is measured through calculation and test, the tensioning screw hole on the nut body is processed to be inwards inclined (shown in figure 3), the tensioning screw hole is parallel to the stud (shown in figure 1) after stress deformation, the stress state of the screw teeth between the tensioning screw and the nut body is improved, and uneven extrusion is avoided. Meanwhile, the gasket adopts a curved surface design with an inclined angle (as shown in fig. 4), so that the stress of the contact surface of the tensioning screw and the gasket is effectively improved, and the lower end surface of the tensioning screw is exactly perpendicular to the upper end surface of the gasket after assembly and keeps planar contact as shown in fig. 1.
It should be understood that equivalents and modifications to the technical scheme and the inventive concept of the present utility model should fall within the scope of the claims appended hereto.
Claims (5)
1. The utility model provides a pretightning structure of threaded connection, includes first connecting piece (1), second connecting piece (2) and threaded connection spare, connecting hole (8) are all offered to corresponding position department on first connecting piece (1) and second connecting piece (2), threaded connection spare's pole portion is worn to establish in connecting hole (8), threaded connection spare's head passes through gasket (3) to be supported on first connecting piece (1) or second connecting piece (2), threaded connection spare's head is opened there are a plurality of tensioning screw holes (41) for put into tensioning screw (4), make tensioning screw (4) compress tightly gasket (3), its characterized in that: the axis (O1) of the tensioning screw hole (41) is obliquely arranged relative to the axis (O) of the threaded connecting piece, and the axis (O1) of the tensioning screw hole (41) is just parallel to the axis (O) of the threaded connecting piece after the tensioning screw hole (41) is stressed and deformed.
2. The threadable coupling pretension structure according to claim 1, characterized in that: the gaskets (3) are arranged in an inclined mode with high outside and low inside, and after the heads of the threaded connectors are deformed under the force, the tensioning screws (4) are perpendicular to the surfaces of the gaskets (3).
3. The threadable coupling pretension structure according to claim 1, characterized in that: the tensioning screw holes (41) are uniformly distributed on the periphery of the rod part of the threaded connecting piece along the circumferential direction, and one or more circles of the tensioning screw holes (41) are arranged.
4. A screw-coupled pretensioning structure according to any one of claims 1 to 3, characterized in that: the head of the threaded connecting piece is a nut body (5), the rod part of the threaded connecting piece is a stud (6), and the stud (6) penetrates through the nut body (5), the first connecting piece (1) and the second connecting piece (2).
5. A screw-coupled pretensioning structure according to any one of claims 1 to 3, characterized in that: the threaded connecting piece is a bolt (7), the tensioning screw hole (41) is formed in the head portion (71) of the bolt, and the bolt rod portion (72) penetrates into the connecting holes (8) of the first connecting piece (1) and the second connecting piece (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322305845.9U CN220566389U (en) | 2023-08-25 | 2023-08-25 | Screw thread connection pre-tightening structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322305845.9U CN220566389U (en) | 2023-08-25 | 2023-08-25 | Screw thread connection pre-tightening structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220566389U true CN220566389U (en) | 2024-03-08 |
Family
ID=90093485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322305845.9U Active CN220566389U (en) | 2023-08-25 | 2023-08-25 | Screw thread connection pre-tightening structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220566389U (en) |
-
2023
- 2023-08-25 CN CN202322305845.9U patent/CN220566389U/en active Active
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