Fastening bolt

Abstract

The utility model discloses a fastening bolt, which relates to the technical field of bolts, and comprises a bolt head, the bottom surface of the bolt head is fixedly connected with a screw rod, the bottom end of the screw rod is provided with a guide conical screw rod tip, the outer surface of the screw rod is divided into an upper thread section and a lower thread section along the axial direction, two sets of non-return mechanisms are spirally distributed between the upper threaded section and the lower threaded section, each non-return mechanism comprises a non-return piece, an auxiliary elastic piece, an outer end elastic piece and an inner side tip end, and the root of each non-return piece is fixedly welded to the surface of the screw rod; the free end of the non-return piece obliquely extends in the axis direction of the screw to form an inner side tip end. According to the utility model, the tip of the inner side of the non-return mechanism is elastically shrunk when screwed in and is meshed with the matched thread to form mechanical locking when screwed out; the outer-end elastic piece provides reverse resistance, the outer-end elastic piece and the auxiliary elastic piece form a double-elastic barrier, and the composite driving groove is matched with a standard hexagon wrench and a cross screwdriver to meet the requirements of different working conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt technical field, especially a fastening bolt. BACKGROUND

[0002] Traditional bolt is easy to loosen under vibration working condition, and the existing improvement scheme mainly relies on additional anti-loosening gasket or chemical adhesive, resulting in complex assembly and non-reusable. Some bolts with reverse stopping structure have the following defects: redundant structure, reverse stopping is realized by welding additional metal sheet, weight is increased and is easy to fall off; complex process, reverse stopping parts need to be assembled after separate machining, and production cost is high; poor compatibility, reverse stopping angle is fixed, and cannot adapt to different screwing depth working conditions; strength loss, slotting setting reverse stopping structure weakens the strength of the screw body. SUMMARY

[0003] The utility model discloses a fastening bolt, which can effectively solve the problems in the background art.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0005] A fastening bolt, comprising a bolt head, the bottom surface of the bolt head is fixedly connected with a screw rod, the bottom end of the screw rod is provided with a screw rod tip with a guide cone shape, the outer surface of the screw rod is divided into an upper thread segment and a lower thread segment along the axial direction, and two groups of reverse stopping mechanisms are spirally distributed between the upper thread segment and the lower thread segment.

[0006] The reverse stopping mechanism comprises a reverse stopping sheet, an auxiliary spring sheet, an outer end spring sheet and an inner side tip, wherein: the reverse stopping sheet root is fixedly welded on the surface of the screw rod; the free end of the reverse stopping sheet extends obliquely to the screw rod axis direction to form the inner side tip; the outer side of the reverse stopping sheet is elastically connected with the outer end spring sheet through the auxiliary spring sheet, and the end of the outer end spring sheet is fixed with the surface of the screw rod.

[0007] Preferably, the top surface of the bolt head is provided with a composite driving groove, which comprises an internal hexagonal groove and a cross recess nested at the bottom of the internal hexagonal groove, and the depth of the cross recess is 1 / 3-1 / 2 of the depth of the internal hexagonal groove.

[0008] Preferably, the connection between the bolt head and the screw rod is circumferentially equidistantly distributed with 4-6 triangular reinforcing ribs, and the height of the reinforcing rib is 1 / 10-1 / 8 of the diameter of the screw rod.

[0009] Preferably, the helix angles of the upper thread segment and the lower thread segment are the same and continuously distributed, the two groups of reverse stopping mechanisms are respectively located at the starting end of the upper thread segment and the lower thread segment, and the oblique direction of the reverse stopping sheet is consistent with the screwing direction.

[0010] Preferably, the surface of the reverse stopping sheet is provided with nanoscale anti-skid lines.

[0011] Preferably, the cone angle of the screw tip is 15°-25°, and the surface of the screw tip is provided with a helical guide groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The inner tip of the anti-reverse mechanism elastically contracts when screwed in and engages with the mating thread when screwed out to form a mechanical lock; the outer end spring provides reverse resistance and forms a double elastic barrier with the auxiliary spring.

[0014] The composite drive groove is compatible with standard hex wrenches and Phillips screwdrivers to meet different working conditions; the spiral guide groove guides the bolts to accurately enter the hole, reducing thread misalignment damage. Strength and lifespan are improved, with triangular reinforcing ribs dispersing head stress and reducing the risk of breakage; nano-anti-slip texture increases the friction coefficient of the anti-reverse plate, preventing micro-displacement under long-term vibration. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a fastening bolt according to the present invention;

[0016] Figure 2 This is a front view schematic diagram of a fastening bolt according to the present invention;

[0017] Figure 3 This is a top sectional view of the fastening bolt of this utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of a bolt anti-reverse mechanism according to the present invention.

[0019] In the diagram: 1. Bolt head; 2. Cross groove; 3. Hexagonal groove; 4. Reinforcing rib; 5. Anti-reverse mechanism; 51. Anti-reverse plate; 52. Auxiliary spring; 53. Outer end spring; 54. Inner tip; 6. Upper thread; 7. Lower thread; 8. Screw tip; 9. Screw. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] like Figures 1-4 As shown, a fastening bolt includes a bolt head 1, a screw 9 is fixedly connected to the bottom surface of the bolt head 1, the bottom end of the screw 9 is provided with a guide cone-shaped screw tip 8, the outer surface of the screw 9 is divided into an upper thread section 6 and a lower thread section 7 along the axial direction, and two sets of anti-reverse mechanisms 5 are spirally distributed between the upper thread section 6 and the lower thread section 7.

[0022] The reverse stopping mechanism 5 includes a reverse stopping piece 51, an auxiliary elastic piece 52, an outer end elastic piece 53, and an inner side pointed end 54, wherein: the reverse stopping piece 51 is fixedly welded at the root to the surface of the screw rod 9; the free end of the reverse stopping piece 51 extends obliquely to the direction of the screw rod axis to form the inner side pointed end 54; the outer side of the reverse stopping piece 51 is elastically connected with the outer end elastic piece 53 through the auxiliary elastic piece 52, and the end of the outer end elastic piece 53 is fixed to the surface of the screw rod 9.

[0023] In the embodiment, the top surface of the bolt head 1 is provided with a composite driving groove, including an internal hexagonal groove 3 and a cross groove 2 nested at the bottom of the internal hexagonal groove 3, the depth of the cross groove 2 is 1 / 3-1 / 2 of the depth of the internal hexagonal groove 3; the connection between the bolt head 1 and the screw rod 9 is circumferentially equidistantly distributed with 4-6 triangular reinforcing ribs 4, the height of the reinforcing rib 4 is 1 / 10-1 / 8 of the diameter of the screw rod.

[0024] Specifically, the composite driving groove 2 / 3 is adapted to standard hexagonal wrenches and cross screwdrivers to cope with different working condition requirements; the spiral guide groove 81 guides the bolt to accurately enter the hole, reducing the damage of thread misplacement. The strength and service life are improved, the triangular reinforcing rib 4 disperses the stress on the head to reduce the risk of fracture; the nano anti-skid line 511 increases the friction coefficient of the reverse stopping piece to avoid micro-displacement under long-term vibration.

[0025] In the embodiment, the helix angles of the upper threaded segment 6 and the lower threaded segment 7 are the same and continuously distributed, the two groups of reverse stopping mechanisms 5 are respectively located at the starting ends of the upper threaded segment 6 and the lower threaded segment 7, and the oblique direction of the reverse stopping piece 51 is consistent with the screwing-in direction of the thread; the surface of the reverse stopping piece 51 is provided with a nano-level anti-skid line, the depth of the line is 20-50 μm, and the direction of the line is perpendicular to the screwing-in direction of the bolt; the taper angle of the screw rod pointed end 8 is 15°-25°, and the surface of the screw rod pointed end 8 is provided with a spiral guide groove, the number of the guide grooves is consistent with the number of the threaded segments.

[0026] Specifically, the inner side pointed end 54 of the reverse stopping mechanism 5 elastically contracts when screwing in, and engages with the mating thread to form mechanical locking when screwing out; the outer end elastic piece 53 provides reverse resistance, and forms a double elastic barrier with the auxiliary elastic piece 52.

[0027] The reverse stopping piece 51 is a main locking unit, which realizes bidirectional locking through elastic deformation; the auxiliary elastic piece 52 stores energy and resets to adjust the action sensitivity of the reverse stopping piece; the spiral guide groove 81 reduces the initial installation skew rate to protect the thread precision; the composite driving groove 2 / 3 expands the tool compatibility to adapt to narrow space operation.

[0028] Working principle: screwing-in process: the spiral guide groove 81 of the screw rod pointed end 8 guides the bolt to align with the screw hole; the reverse stopping piece 51 is pressed by the thread hole, the inner side pointed end 54 contracts inward, and the auxiliary elastic piece 52 stores energy; the upper and lower threaded segments 6 / 7 are segmented to bear, reducing local stress.

[0029] Anti-loosening stage: when the bolt is subjected to reverse force, the reverse stop sheet 51 is popped out outward under the action of elastic force, the inner side sharp end 54 is pierced into the surface of the matched part to form mechanical anchoring, and the outer end elastic sheet 53 is in contact with the thread side to generate additional friction resistance.

[0030] Dismounting operation: additional torque needs to be applied to overcome the locking force of the reverse stop mechanism 5, at this time, the auxiliary elastic sheet 52 is deformed to release energy, controlled dismounting is realized, and the dismounted device cannot be reused. It is especially suitable for high-frequency vibration scenes such as automobile chassis and wind power tower drums.

[0031] The basic principle and main features of the utility model and the advantages of the utility model are shown and described. It should be understood by the skilled in the art that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only for illustrating the principle of the utility model, various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A fastening bolt, characterized in that: Includes a bolt head (1), the bottom surface of which is fixedly connected to a screw (9), the bottom end of which is provided with a guide cone-shaped screw tip (8), the outer surface of which is divided into an upper thread section (6) and a lower thread section (7) along the axial direction, and two sets of anti-reverse mechanisms (5) are spirally distributed between the upper thread section (6) and the lower thread section (7). The anti-reverse mechanism (5) includes an anti-reverse plate (51), an auxiliary spring plate (52), an outer end spring plate (53), and an inner tip (54), wherein: the root of the anti-reverse plate (51) is fixedly welded to the surface of the screw (9); the free end of the anti-reverse plate (51) extends obliquely towards the screw axis to form an inner tip (54); the outer side of the anti-reverse plate (51) is elastically connected to the outer end spring plate (53) through the auxiliary spring plate (52), and the end of the outer end spring plate (53) is fixed to the surface of the screw (9).

2. A fastening bolt according to claim 1, characterized in that: The top surface of the bolt head (1) is provided with a composite drive groove, including an internal hexagonal groove (3) and a cross groove (2) nested at its bottom. The depth of the cross groove (2) is 1 / 3 to 1 / 2 of the depth of the internal hexagonal groove (3).

3. A fastening bolt according to claim 1, characterized in that: At the connection between the bolt head (1) and the screw (9), there are 4 to 6 triangular reinforcing ribs (4) evenly distributed along the circumference. The height of the reinforcing ribs (4) is 1 / 10 to 1 / 8 of the screw diameter.

4. A fastening bolt according to claim 1, characterized in that: The upper thread section (6) and the lower thread section (7) have the same helix angle and are continuously distributed. The two sets of anti-reverse mechanisms (5) are located at the starting ends of the upper thread section (6) and the lower thread section (7), respectively, and the tilt direction of the anti-reverse plate (51) is consistent with the thread screwing direction.

5. A fastening bolt according to claim 1, characterized in that: The surface of the anti-reverse plate (51) is provided with nano-level anti-slip texture.

6. A fastening bolt according to claim 1, characterized in that: The cone angle of the screw tip (8) is 15°-25°, and the surface of the screw tip (8) is provided with a spiral guide groove.

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