Screw based on chemical reaction hardening anti-loosening structure
By coating the micropowder layer containing alumina, cyanoacrylate and tungsten carbide on the screws and nuts of the screws, and causing chemical reactions to form a cured layer through the acid catalytic liquid, the problem of the easy failure of traditional anti-loose screws in high vibration or high torque environments is solved, and stable anti-loose performance and high wear resistance are achieved.
Patent Information
- Application Number
- CN202411926937.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-02-25
AI Technical Summary
Traditional anti-loose screws are prone to failure in high vibration or high torque environments, and their anti-loose performance is limited, making it difficult to meet the requirements of enhanced anti-loose effect and wear resistance in actual use.
Anti-loosening structural screws based on chemical reaction hardening are used. The inner and outer thread surfaces of the screws and nuts are coated with a micropowder layer containing alumina, cyanoacrylate and tungsten carbide, and a chemical reaction is initiated by an acid catalytic liquid to form a cured layer to achieve anti-loosening effect.
By controlling the thickness of the cured layer, the screws have stable anti-loosening performance in a variety of environments, suitable for high vibration or high torque environments, and improve the wear resistance and reusability of the screws.
Smart Images
Figure CN119508329A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of fasteners, and in particular to a screw with a chemical reaction hardening anti-loosening structure, which is used to prevent the screw from loosening under high vibration or high torque conditions. Background Art
[0002] Traditional anti-loosening screws usually use mechanical methods (such as anti-loosening washers or self-locking nuts) to prevent loosening. However, these mechanical structures are prone to failure in high vibration or frequent torsion environments, and have limitations in anti-loosening performance. Therefore, there is an urgent need for an anti-loosening screw structure that enhances the anti-loosening effect and has high wear resistance during actual use. Summary of the invention
[0003] The purpose of the present invention is to provide a method to solve the problems raised in the above background technology.
[0004] To achieve the above object, the present invention provides the following technical solutions:
[0005] A screw with a chemical reaction hardening anti-loosening structure comprises a screw rod and a nut, and is characterized in that: the inner and outer thread surfaces of the screw rod and the nut are coated with a micro-powder layer containing 40%-50% aluminum oxide (Al2O3), 30%-35% cyanoacrylate (C5H5NO2), and 10%-20% tungsten carbide (WC); in a tightened state, a chemical reaction in the micro-powder layer is induced by an acidic catalytic liquid to generate a solidified layer to achieve an anti-loosening effect; the thickness of the solidified layer is achieved by controlling the coating thickness of the micro-powder layer and the amount of the acidic catalytic liquid used.
[0006] Preferably, the acidic catalyst liquid includes a mixture of phosphoric acid (H3PO4) and acetic acid (CH3COOH) in a ratio of 1:1 to 1:2 and a concentration range of 5%-10%, which can trigger a curing reaction within 30 seconds to 2 minutes.
[0007] Preferably, the content of tungsten carbide (WC) in the micro powder layer is 10% to 20% to improve the surface hardness of the solidified layer.
[0008] Preferably, the cyanoacrylate (C5H5NO2) forms a solidified layer through polymerization reaction under acidic conditions, and the hardness of the solidified layer reaches 8H.
[0009] Preferably, the aluminum oxide (Al2O3) in the micropowder layer further enhances the adhesion and wear resistance of the cured layer by polymerizing with cyanoacrylate.
[0010] Preferably, the pH value of the acidic catalyst liquid is controlled between 3 and 3.5 to optimize the reaction speed and curing effect.
[0011] Preferably, the internal thread of the nut is designed with a micro-groove with a depth of 0.01 to 0.02 mm, which is used to store the unreacted components in the micro-powder layer for reuse.
[0012] Preferably, the thickness of the solidified layer generated after the surface of the screw and the nut is hardened is 0.02 to 0.05 mm.
[0013] Compared with the prior art, the present invention has the following beneficial effects:
[0014] 1. This screw, which is based on a chemical reaction hardening anti-loosening structure, controls the thickness of the solidified layer to ensure that it has stable anti-loosening performance in a variety of environments and can remain tight even in high vibration or high torque environments.
[0015] 2. This is a screw with a chemical reaction hardening anti-loosening structure. The coating combination ensures wear resistance and adhesion, increases the reusability of the screw, and is suitable for long-term use in harsh working conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 : Schematic diagram of the overall structure of the screw, showing the basic structural relationship between the screw (1) and the nut (2), as well as the coating position of the micropowder layer (3).
[0017] Figure 2 : A partial enlarged view of the threaded part of the screw (1) and the nut (2), which clearly shows the distribution of the micro powder layer (3) on the thread surface, making it easier to understand the working principle of the anti-loosening structure.
[0018] Figure 3 : A schematic diagram of the process of dropping the acidic catalyst liquid (4), showing the operation method of evenly distributing the catalyst liquid on the thread contact surface through a syringe or a dropper.
[0019] Figure 4 : A cross-sectional view of the screw and the nut tightly combined after the solidified layer (5) is formed, showing the thickness of the solidified layer in the tightened state and its uniform covering effect.
[0020] In the figure: 1. screw; 2. nut; 3. micro powder layer; 4. acidic catalyst liquid; 5. solidified layer. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0022] Example 1
[0023] The screw has a micro powder layer (3) coated on the inner and outer thread surfaces of the screw rod (1) and the nut (2), wherein the micro powder layer contains 45% aluminum oxide, 32% cyanoacrylate, and 18% tungsten carbide. After the screw is tightened, an acidic catalyst liquid (4) containing 5% phosphoric acid and acetic acid (in a ratio of 1:1) is dripped, and the acidic catalyst liquid triggers a polymerization reaction of cyanoacrylate within 45 seconds to generate a solidified layer (5) with a thickness of about 0.03 mm. The hardness of the hardened solidified layer is 7.5H, which is suitable for medium vibration environments.
[0024] To control the thickness of the solidified layer, the micro powder layer is evenly coated to a range of 0.02 to 0.05 mm, and the amount of acidic catalyst added is 0.1 to 0.15 ml to ensure that the final solidified layer thickness is around 0.03 mm. The solidified layer within this thickness range has stable anti-loosening performance in a vibration environment.
[0025] Example 2
[0026] 10% iron oxide was added to the micro powder layer to improve adhesion, and the other ingredients were the same as those in Example 1. A mixed catalyst solution of 5% phosphoric acid and acetic acid (1:2) was added dropwise, and the hardening reaction was completed in about 90 seconds. The hardness of the cured layer reached 8H, which is suitable for high torque connection scenarios and effectively prevents loosening. The thickness of the hardened layer was controlled at 0.04 mm.
[0027] The control method is also achieved through the coating thickness of the micro powder layer and the amount of acidic catalyst liquid added. Here, the thickness of the micro powder layer is kept in the range of 0.04 to 0.05 mm, and the amount of catalyst liquid added is 0.15 ml to ensure high adhesion and a thicker solidified layer, which is suitable for repeated use in high torque occasions.
[0028] Example 3
[0029] 3% silicate powder is added to the micro powder layer of the screw and nut to improve corrosion resistance, and a mixed acid catalytic liquid is used. After hardening, the hardness of the cured layer is increased to 8.5H, and the hardening time is 60 seconds. This design is used in high humidity environments and can maintain a long-term anti-loosening effect.
[0030] To adapt to high humidity environment, the thickness of the solidified layer needs to be controlled at 0.04 mm, which is precisely achieved by uniformly coating the micro powder layer and adding the appropriate amount of catalyst liquid. The amount of catalyst liquid is controlled at 0.12 to 0.13 ml to generate a dense and durable solidified layer in a humid environment, improving the anti-loosening effect and corrosion resistance.
[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. A screw with a chemical reaction hardening anti-loosening structure, comprising a screw rod (1) and a nut (2), characterized in that: The inner and outer thread surfaces of the screw (1) and the nut (2) are coated with a micropowder layer (3) containing 40%-50% of aluminum oxide (Al2O3), 30%-35% of cyanoacrylate (C5H5NO2), and 10%-20% of tungsten carbide (WC). In a tightened state, an acidic catalyst liquid (4) triggers a chemical reaction in the micropowder layer to generate a solidified layer (5) to achieve an anti-loosening effect. The thickness of the solidified layer (5) is achieved by controlling the coating thickness of the micropowder layer and the amount of the acidic catalyst liquid.
2. The screw structure according to claim 1, characterized in that: The acidic catalyst liquid (4) comprises a mixture of phosphoric acid (H3PO4) and acetic acid (CH3COOH) in a ratio of 1:1 to 1:2 and a concentration range of 5%-10%, and can trigger a curing reaction within 30 seconds to 2 minutes.
3. The screw structure according to claim 1, characterized in that: The content of tungsten carbide (WC) in the micro-powder layer (3) is 10% to 20%, so as to improve the surface hardness of the solidified layer (5).
4. The screw structure according to claim 1, characterized in that: The cyanoacrylate (C5H5NO2) forms a solidified layer (5) through polymerization reaction under acidic conditions, and the hardness of the solidified layer reaches 8H.
5. The screw structure according to claim 1, characterized in that: The aluminum oxide (Al2O3) in the micropowder layer (3) further enhances the adhesion and wear resistance of the solidified layer (5) by polymerizing with cyanoacrylate.
6. The screw structure according to claim 1, characterized in that: The pH value of the acidic catalyst solution (4) is controlled between 3 and 3.5 to optimize the reaction speed and curing effect.
7. The screw structure according to claim 1, characterized in that: The internal thread of the nut (2) is designed with a micro-groove with a depth of 0.01 to 0.02 mm, which is used to store the unreacted components in the micro-powder layer (3) for reuse.
8. The screw structure according to claim 1, characterized in that: The thickness of the solidified layer (5) generated after the surface of the screw (1) and the nut (2) is hardened is 0.02 to 0.05 mm.