CN211693156U - Novel anti-fatigue and anti-shearing high-strength bolt capable of being installed quickly - Google Patents
Novel anti-fatigue and anti-shearing high-strength bolt capable of being installed quickly Download PDFInfo
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- CN211693156U CN211693156U CN202020217978.4U CN202020217978U CN211693156U CN 211693156 U CN211693156 U CN 211693156U CN 202020217978 U CN202020217978 U CN 202020217978U CN 211693156 U CN211693156 U CN 211693156U
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Abstract
The utility model discloses a novel high strength bolt of antifatigue anti-shear that can swiftly install belongs to tower machine technical field. The variable cross-section screw comprises a variable cross-section screw rod, wherein the middle part of the variable cross-section screw rod is a first diameter section, two sides of the first diameter section are second diameter sections, and the diameter of the first diameter section is larger than that of the second diameter section; the head of the second diameter section on the front side is fixedly connected with an elliptical head, and the tail of the second diameter section on the rear side is a threaded end; the elliptical head, the first diameter section, the second diameter section and the threaded end are connected in a smooth transition mode. The utility model has lower stress concentration, stronger anti-fatigue bearing capacity and longer service life, and the bolt can be disassembled and assembled for use for many times; the large-diameter design of the first diameter section in the middle of the variable cross-section screw enables the bolt to bear shearing and pulling force simultaneously; a wrench can be omitted, manpower and material resources are saved, and the installation is convenient.
Description
Technical Field
The utility model relates to a tower machine technical field specifically is a novel high strength bolt of antifatigue anti-shear that can swiftly install for tower machine standard festival connects.
Background
The main limbs of the standard section of the tower crane can be connected by high-strength bolt flange plates, and the connecting structure needs to bear tension and shearing force. When the flange is provided with the positioning shear pin, the high-strength bolt only bears tensile force, and when the flange is not provided with the positioning shear pin, the high-strength bolt also needs to bear shear force besides the tensile force. When the high-strength bolt is installed, a spanner is needed to clamp the bolt head, and other tools are used for fastening the nut.
The existing high-strength bolt has the following defects:
1, the tensile bolt is not suitable for occasions with larger shearing force, and the capability of bearing the tensile force of the reamed hole bolt is weaker, so the existing high-strength bolt can only be respectively used for tensile and anti-shearing occasions and is not suitable for occasions with simultaneous existence of tensile and shearing;
2, the stress concentration at the bolt head of the existing bolt is large, and the anti-fatigue capability is not strong;
3, the existing hexagon head bolt is not easy to be embedded into a flange structure, and two wrenches are needed to be used during fastening, so that the installation cannot be completed by one person.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a novel high strength bolt of anti-fatigue and anti-shearing that can swiftly install.
The utility model discloses a following technical scheme realizes: a novel fatigue-resistant and shear-resistant high-strength bolt capable of being quickly installed comprises a variable cross-section screw rod, wherein the middle part of the variable cross-section screw rod is a first diameter section, two sides of the first diameter section are second diameter sections, and the diameter of the first diameter section is larger than that of the second diameter section; the head of the second diameter section on the front side is fixedly connected with an elliptical head, and the tail of the second diameter section on the rear side is a threaded end; the elliptical head, the first diameter section, the second diameter section and the threaded end are connected in a smooth transition mode.
It further comprises the following steps: the elliptical head, the first diameter section, the second diameter section and the threaded end are connected in a smooth transition mode through inclined planes.
The elliptical head, the first diameter section, the second diameter section and the threaded end are connected through a large arc in a smooth transition mode.
And a small circular arc is also connected between the elliptical head and the large circular arc of the head part of the second diameter section on the front side in a transition manner.
A boss is fixed in the middle of the front side face of the elliptical head, and the sectional area of the boss is smaller than that of the elliptical head.
The back side face of the elliptical head is provided with a chamfer face.
The variable cross-section screw of the utility model adopts different circular arc transition, reduces stress concentration, increases the anti-fatigue capability of the bolt, and prolongs the service life of the bolt; the diameter of the first diameter section in the middle of the variable cross-section screw rod is increased, so that the variable cross-section screw rod can bear the shearing force of the connecting end face; the elliptical head is matched with the upper boss and the chamfer surface, so that the bolt is convenient for compact installation, and the installation convenience is improved. During installation, a boss is inserted by hand to form a gap between the bolt head and the surface of the structure, the bolt is supported, the elliptical head is embedded into the flange rib plate structure, and the nut is arranged at the other end of the bolt and is fastened by a wrench.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the variable cross-section screw has different cross-section sections, and is connected through smooth transition of a large arc and a small arc, so that the variable cross-section screw has lower stress concentration, the bolt has stronger fatigue resistance bearing capacity and longer service life, and the bolt can be disassembled and assembled for use for many times;
2. the large-diameter design of the first diameter section in the middle of the variable cross-section screw enables the bolt to bear shearing and pulling force simultaneously;
3. the design of the elliptical head can be embedded into a flange structure, a wrench is saved, manpower and material resources are saved, and a large chamfer surface below the elliptical head can avoid a welding seam to enable a bolt head to be clamped in better;
4. the boss on the elliptical head can form a space between the bolt head and the structure, so that the bolt can be conveniently supported by one hand, and the installation is convenient.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a left side view of FIG. 1;
in the figure: 1. a boss; 2. an elliptical head; 3. a small arc; 4. a large circular arc; 5. a first diameter section; 6. a threaded end; 7. chamfering; 8. a second diameter section.
Detailed Description
The following is a specific embodiment of the present invention, which will be further described with reference to the accompanying drawings.
As shown in figures 1 and 2, the novel fatigue-resistant and shear-resistant high-strength bolt can be quickly installed, the variable cross-section screw is used for being matched with a connecting nut and bearing shear, the variable cross-section screw comprises a variable cross-section rod and a threaded end located at the tail end of the variable cross-section rod, and the threaded end is used for being matched with the nut to fasten.
The middle part of the variable cross-section rod is a first diameter section 5, two sides of the first diameter section 5 are second diameter sections 8, and the diameter of the first diameter section 5 is larger than that of the second diameter section 8. The head of the second diameter section 8 at the front side is fixedly connected with the elliptical head 2, and the tail of the second diameter section 8 at the rear side is connected with the threaded end 6. The elliptical head 2, the first diameter section 5, the second diameter section 8 and the threaded end 6 are in smooth transition connection through a bevel or a large arc 4, and the large arc 4 is preferably in smooth transition connection in the embodiment. The variable cross-section rod, the threaded end and the elliptical head 2 can bear tension, the first diameter section 5 with the larger middle diameter can bear shearing force, and the second diameter sections 8 at the smaller diameters of the two sides are only used for bearing tension.
A small arc 3 is also connected between the elliptical head 2 and the large arc 4 at the head of the second diameter section 8 at the front side in a transition manner, and the radius of the small arc 3 is smaller than that of the large arc 4. Through the transitional connection of the small circular arcs 3, the section mutation between the screw rod and the bolt head is further reduced, the stress concentration is reduced, and the anti-fatigue bearing capacity of the bolt is improved.
The middle part of the front side surface of the elliptical head 2 is fixed with a boss 1, and the sectional area of the boss 1 is smaller than that of the elliptical head 2. When the screw rod is upward, the screw rod head is downward and stands on the structure to be installed, the boss can enable a gap to be formed between the screw rod head and the structure, and the screw rod can be conveniently supported by inserting one hand. The oval head 2 is oval, so that the bolt head can be embedded into the rib plate structure of the connecting flange more easily, and the bolt does not need to be clamped by a spanner during fastening. The two ends of the back side face of the elliptical head 2 are provided with chamfer faces 7, and the chamfer faces 7 can avoid welding seams on the rib plates.
The use process comprises the following steps:
during installation, the boss enables a gap to be formed between the bolt head and the surface of the structure, the bolt is inserted into the gap by hands and supported, the elliptical head is embedded into the flange rib plate structure, the nut is arranged at the other end of the bolt and is fastened by a wrench, and therefore a wrench is omitted, and the installation is convenient;
besides the capability of bearing tension when the bolt works, the large-diameter shearing surface in the middle of the screw rod can also bear shearing capability. The structural form of low stress concentration of the bolt improves the fatigue resistance and bearing capacity of the bolt, can prolong the service life of the bolt and enables the bolt to be disassembled and assembled for use for many times.
Claims (6)
1. The utility model provides a novel high strength bolt of antifatigue anti-shear that can swiftly install which characterized in that: the screw comprises a variable cross-section screw, wherein the middle part of the variable cross-section screw is provided with a first diameter section (5), two sides of the first diameter section (5) are provided with second diameter sections (8), and the diameter of the first diameter section (5) is larger than that of the second diameter section (8); the head of the second diameter section (8) on the front side is fixedly connected with an elliptical head (2), and the tail of the second diameter section (8) on the rear side is a threaded end (6); the elliptical head (2), the first diameter section (5), the second diameter section (8) and the threaded end (6) are connected in a smooth transition mode.
2. The novel high-strength bolt capable of being quickly installed and resisting fatigue and shearing as claimed in claim 1, is characterized in that: the elliptical head (2), the first diameter section (5), the second diameter section (8) and the threaded end (6) are connected through inclined plane smooth transition.
3. The novel high-strength bolt capable of being quickly installed and resisting fatigue and shearing as claimed in claim 1, is characterized in that: the elliptical head (2), the first diameter section (5), the second diameter section (8) and the threaded end (6) are connected in a smooth transition mode through a large circular arc (4).
4. The novel high-strength bolt capable of being quickly installed and resisting fatigue and shearing as claimed in claim 3, is characterized in that: and a small arc (3) is also connected between the elliptical head (2) and the large arc (4) at the head of the second diameter section (8) on the front side in a transition manner.
5. The novel high-strength bolt capable of being quickly installed and resisting fatigue and shearing as claimed in claim 1, is characterized in that: a boss (1) is fixed in the middle of the front side face of the elliptical head (2), and the sectional area of the boss (1) is smaller than that of the elliptical head (2).
6. The novel high-strength bolt capable of being quickly installed and resisting fatigue and shearing as claimed in claim 1, is characterized in that: the back side surface of the elliptical head (2) is provided with a chamfer surface (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020217978.4U CN211693156U (en) | 2020-02-27 | 2020-02-27 | Novel anti-fatigue and anti-shearing high-strength bolt capable of being installed quickly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020217978.4U CN211693156U (en) | 2020-02-27 | 2020-02-27 | Novel anti-fatigue and anti-shearing high-strength bolt capable of being installed quickly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211693156U true CN211693156U (en) | 2020-10-16 |
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ID=72778646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020217978.4U Active CN211693156U (en) | 2020-02-27 | 2020-02-27 | Novel anti-fatigue and anti-shearing high-strength bolt capable of being installed quickly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211693156U (en) |
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2020
- 2020-02-27 CN CN202020217978.4U patent/CN211693156U/en active Active
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