Lock bolt

Abstract

The utility model discloses a lock bolt which comprises a screw head and a screw rod, the screw head is connected to the head of the screw rod, threads are arranged on the screw rod in a spiral shape, a wedge-shaped slope is arranged between the front and back adjacent threads, and an included angle of 30 degrees is formed between the wedge-shaped slope and the center line of the screw rod. The nut is reasonable and ingenious in structural design, the direction of the radial force of the bolt is changed when the nut is matched with the bolt, the radial force is increased, the friction force is increased, meanwhile, the radial force distribution on each tooth opening is more uniform, and the loosening probability is reduced.

Description

Technical Field

[0001] This utility model relates to an anti-loosening bolt, especially an anti-loosening bolt used on the reducer of a photovoltaic tracking bracket, and belongs to the field of fastener technology. Background Technology

[0002] Bolts are a common type of fastener structure, and their screw surfaces typically use standard threads that match the nut threads, such as... Figure 3 As shown, approximately 70% to 80% of the radial force is concentrated on the first and second threads closest to the bolt head, with the last thread even suspended in a suspended state. The force distribution at both ends is very uneven, which can easily cause metal fatigue and lead to bolt loosening in environments with large temperature differences, such as outdoors. Furthermore, the angle between the radial and axial forces is 30°. Under a constant load, the radial force is greater than the axial force, and the axial force is √3 / 2 times the radial force. Its friction is relatively low, making it equally prone to loosening.

[0003] Each photovoltaic tracking bracket has approximately 37 threaded holes on its reducer, requiring 37 bolts. Since the photovoltaic brackets are installed in open outdoor areas with significant day-night temperature differences, ordinary threads are very prone to loosening. Inspecting each bolt individually would require considerable manpower and time. Traditionally, adhesive is used to prevent loosening, but this increases costs, and the adhesive is also prone to aging and cracking when exposed to wind and sun for extended periods outdoors. Furthermore, the adhesive's coefficient of thermal expansion differs significantly from that of the bolts, making it unreliable. Utility Model Content

[0004] To overcome the above-mentioned shortcomings, this utility model provides an anti-loosening bolt with high reliability and can be used in outdoor photovoltaic equipment.

[0005] To achieve this objective, the structure adopted in this utility model is as follows: an anti-loosening bolt, including a screw head and a screw rod, the screw head being connected to the head of the screw rod, the screw rod having spirally arranged threads, and a wedge-shaped slope being provided between adjacent threads, the wedge-shaped slope forming a 30° angle with the center line of the screw rod.

[0006] The wedge-shaped slope is arranged in a ring between adjacent threads, and the diameter of the end of the wedge-shaped slope near the screw head is smaller than that of the end near the end of the screw.

[0007] A boss is provided around the screw rod on the side of the screw head facing the screw rod. The diameter of the boss is smaller than that of the screw head, and the thickness of the boss is 0.5-2mm.

[0008] The longitudinal section of the boss is trapezoidal, and the diameter of the end of the boss near the screw is smaller than the diameter of the end near the screw head.

[0009] Its beneficial effects are: the structure of this utility model is reasonable and ingenious, which changes the direction of the radial force of the bolt when the nut and bolt are matched, increases the radial force, increases the friction, and makes the radial force distribution on each thread more uniform, reducing the probability of loosening. Attached Figure Description

[0010] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0011] Figure 1 This is the front view of this utility model;

[0012] Figure 2 This is a cross-sectional view of the present invention after it has been connected with the nut;

[0013] Figure 3 This is a schematic diagram of the radial force distribution of a common bolt;

[0014] Figure 4 This is a schematic diagram of the radial force distribution of this utility model. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components; a fixed connection can be welding or adhesive bonding. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] like Figure 1The anti-loosening bolt shown includes a screw head 1 and a screw rod 2. The screw head 1 is connected to the head of the screw rod 2. The screw rod 2 has spirally arranged threads 3. A wedge-shaped slope 4 is provided between adjacent threads 3. The wedge-shaped slope 4 forms a 30° angle with the center line of the screw rod 2.

[0019] The wedge-shaped slope 4 is arranged in a ring between adjacent threads 3, and the diameter of the end of the wedge-shaped slope 4 near the screw head 1 is smaller than that of the end near the end of the screw 2.

[0020] A boss is provided around the screw rod 2 on the side of the screw head 1 facing the screw rod 2. The diameter of the boss is smaller than that of the screw head 1, and the thickness of the boss is 0.5-2mm. The longitudinal section of the boss is trapezoidal, and the diameter of the end of the boss near the screw rod 2 is smaller than the diameter of the end near the screw head 1.

[0021] like Figure 2 As shown, when the anti-loosening bolt is connected to the nut 5, the nut thread 6 engages with the bolt thread 3, and the end of the nut thread 6 abuts against the wedge-shaped slope surface 4. Through force analysis testing, as shown... Figure 4 As shown, under a constant load, the radial force on the anti-loosening bolt decreases sequentially from the bolt head 1 to the end of the bolt 2, but only accounts for about 40% to 50% at the first and second threads, resulting in a relatively uniform overall distribution and reduced fatigue. Simultaneously, due to the 30° angle of the wedge-shaped slope, the force direction changes. Under the same axial force, the radial force is three times that of a standard bolt, increasing the friction between the anti-loosening bolt and the nut and improving the overall anti-loosening performance. When applied to equipment in environments with large day and night temperatures, such as the reducer of a photovoltaic tracking bracket, it can reduce maintenance frequency, eliminate the need for glue, and improve bolt reliability.

[0022] Based on the above description and inspired by this utility model, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An anti-loosening bolt, comprising a screw head (1) and a screw rod (2), wherein the screw head (1) is connected to the head of the screw rod (2), and the screw rod (2) has a spirally arranged thread (3), characterized in that, A wedge-shaped slope (4) is provided between adjacent threads, and the wedge-shaped slope (4) forms a 30° angle with the center line of the screw (2).

2. The anti-loosening bolt according to claim 1, characterized in that, The wedge-shaped slope (4) is arranged in a ring between adjacent threads, and the diameter of the end of the wedge-shaped slope (4) near the screw head (1) is smaller than that of the end near the end of the screw (2).

3. The anti-loosening bolt according to claim 1, characterized in that, The screw head (1) has a boss surrounding the screw rod (2) on the side facing the screw rod (2). The diameter of the boss is smaller than that of the screw head (1), and the thickness of the boss is 0.5-2mm.

4. The anti-loosening bolt according to claim 3, characterized in that, The longitudinal section of the boss is trapezoidal, and the diameter of the end of the boss near the screw (2) is smaller than the diameter of the end near the screw head (1).

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