Lock washer for fastening bolt

Abstract

The utility model relates to the technical field of washers, one embodiment of the utility model provides an anti-loose washer for bolt fastening, the anti-loose washer comprises a first elastic washer provided with an extrusion ring groove and a first through hole, and the extrusion ring groove is arranged around the first through hole; the elastic balls are arranged in the extrusion ring groove, a first extrusion conical ring is formed between the extrusion ring groove and the first through hole, and the minimum diameter of the first extrusion conical ring is smaller than the diameter of the first through hole. By means of the technical scheme, the technical problem that in the prior art, an anti-loose gasket cannot be accurately matched with connected pieces of different sizes is solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of gaskets, and in particular, to a bolt fastening anti-loose gasket. BACKGROUND

[0002] A gasket refers to a part placed between a connected part and a nut to protect the surface of the connected part from being scratched by the nut. It is generally a flat metal ring or a rubber ring that distributes the pressure of the nut on the connected part and enhances the anti-loose effect.

[0003] However, in the use process of the existing anti-loose gasket, it is difficult to accurately adapt to different sizes of connected parts (bolts). After being subjected to a load, gaps or relative slipping may occur between the anti-loose gasket and the connected part or the nut, thereby causing the nut to loosen, poor stability, and reduced applicability of the device body. Therefore, the existing anti-loose gasket needs to be improved to meet the actual needs.

[0004] To accurately adapt to different sizes of connected parts, one way is to prepare a large number of anti-loose gaskets of different sizes in advance for use. This way increases the cost and is less convenient to use, and the most suitable anti-loose gasket cannot be quickly and accurately found. Another way is to weld small springs and adapter plates on the inner wall of the anti-loose gasket. As found in a search, the anti-loose gasket disclosed in the authorized announcement No. CN221879965U includes a gasket body and a pressing piece. The gasket body includes a gasket upper part and a gasket lower part. Springs are installed in the circumferential array of the inner wall of the gasket body. The side end of the spring is fixedly installed with a pressing ring. The difficulty of this way lies in that the gasket body is relatively small, and a plurality of springs and pressing rings are welded on the inner wall of the gasket body to accurately adapt to different sizes of connected parts. The processing difficulty is too great, the service life cannot be improved, and the applicability of the anti-loose gasket is reduced instead. SUMMARY

[0005] To overcome the above-mentioned defects, embodiments of the present disclosure provide a bolt fastening anti-loose gasket, which solves the technical problem that the anti-loose gasket in the related art cannot accurately adapt to different sizes of connected parts.

[0006] According to one aspect, at least one embodiment of the present disclosure provides a bolt fastening anti-loose gasket, which includes: a first elastic gasket, the first elastic gasket having a pressing ring groove and a first through hole, the pressing ring groove being arranged around the first through hole;

[0007] A plurality of elastic balls are arranged in the pressing ring groove. A first pressing cone ring is formed between the pressing ring groove and the first through hole. The minimum diameter of the first pressing cone ring is smaller than the diameter of the first through hole.

[0008] For example, in the anti-loose washer for bolt fastening provided by at least one of the embodiments of the present disclosure, the extrusion ring groove has an opening, the first elastic washer further has a protective ring plate, the protective ring plate is located at the opening and on one side of the elastic ball, and the plurality of elastic balls abut against the protective ring plate.

[0009] For example, in the anti-loose washer for bolt fastening provided by at least one of the embodiments of the present disclosure, the protective ring plate is arc-shaped, there are two protective ring plates, and the two protective ring plates are arranged at intervals, and the elastic ball is located between the two protective ring plates.

[0010] For example, in the anti-loose washer for bolt fastening provided by at least one of the embodiments of the present disclosure, the first elastic washer is an inner ring, and further comprising:

[0011] an elastic outer ring, which is sleeved on the outer wall of the first elastic washer.

[0012] For example, in the anti-loose washer for bolt fastening provided by at least one of the embodiments of the present disclosure, further comprising:

[0013] a second elastic washer, the periphery of the elastic outer ring and the periphery of the second elastic washer are provided with wedge-shaped engagement portions, the wedge-shaped engagement portion of the elastic outer ring and the wedge-shaped engagement portion of the second elastic washer are engaged with each other, the second elastic washer further has a second through hole, the first through hole and the second through hole are coaxially arranged, and the diameter of the first through hole is equal to the diameter of the second through hole.

[0014] For example, in the anti-loose washer for bolt fastening provided by at least one of the embodiments of the present disclosure, the top of the first elastic washer is provided with an inner conical annular surface, the inner conical annular surface is arranged around the extrusion ring groove, the bottom of the second elastic washer is provided with an outer conical annular portion, and the outer conical annular portion is attached to the inner conical annular surface.

[0015] For example, in the anti-loose washer for bolt fastening provided by at least one of the embodiments of the present disclosure, the top of the second elastic washer is provided with a second extrusion conical ring, and the minimum diameter of the second extrusion conical ring is equal to the diameter of the second through hole.

[0016] For example, in the anti-loose washer for bolt fastening provided by at least one of the embodiments of the present disclosure, the top of the second elastic washer and the bottom of the first elastic washer are further provided with a reinforcing layer.

[0017] For example, in the anti-loose washer for bolt fastening provided by at least one of the embodiments of the present disclosure, the reinforcing layer comprises a zinc steel alloy layer and a hot-dipped galvanized layer.

[0018] For example, in a bolt-fastening anti-loosening washer provided in at least one embodiment of this disclosure, the bottom of the first elastic washer also has a plurality of anti-slip protrusions, and the plurality of anti-slip protrusions are arranged circumferentially around the first through hole.

[0019] The beneficial effects of the embodiments disclosed herein are as follows:

[0020] 1. Strong adaptability: Through the cooperation of elastic balls and the first compression cone ring, that is, several elastic balls squeeze the first compression cone ring from all sides, so that the minimum diameter of the first compression cone ring is smaller than the diameter of the first through hole. When in use, the connected part (bolt) passes through the first through hole, and the first compression cone ring can fit more tightly against the outer wall of the bolt, adapting to connected parts (bolts) of different sizes. There is no need to prepare a large number of anti-loosening washers of different sizes, reducing costs and making it convenient to use.

[0021] 2. Excellent anti-loosening effect: Several elastic balls fit tightly together, providing continuous clamping force to the first elastic washer, effectively preventing the nut from loosening and improving the stability and applicability of the anti-loosening washer.

[0022] 3. Low processing difficulty: Compared with welding small springs and adapter plates to the inner wall of the washer, this structure only requires opening an extrusion ring groove on the first elastic washer and extruding the elastic ball, which greatly reduces the processing difficulty and is conducive to large-scale production. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0024] Figure 1 This is a diagram showing the mating of a first elastic washer and an elastic ball in one embodiment of this disclosure;

[0025] Figure 2 This is a schematic diagram of the structure of the first elastic washer in this disclosure;

[0026] Figure 3 This is a diagram showing the fit between the first elastic washer, the elastic ball, and the protective ring plate in this disclosure;

[0027] Figure 4 for Figure 3 A partial sectional view;

[0028] Figure 5 for Figure 4 Enlarged view of section A in the middle;

[0029] Figure 6This is a schematic diagram of the structure of the elastic outer ring in this disclosure;

[0030] Figure 7 This is a schematic diagram of the structure of the second elastic washer in this disclosure;

[0031] Figure 8 This is a schematic diagram of the structure of the second extrusion cone ring in this disclosure;

[0032] Figure 9 This is a schematic diagram of the reinforcement layer in this disclosure;

[0033] Figure 10 This is a schematic diagram of the anti-slip protrusion in this disclosure.

[0034] In the figure: 1. First elastic washer, 101. Extrusion ring groove, 102. First through hole, 103. Opening, 104. Protective ring plate, 105. Inner conical ring surface, 106. Anti-slip protrusion, 2. Elastic ball, 3. First extrusion conical ring, 4. Elastic outer ring, 5. Second elastic washer, 501. Second through hole, 502. Outer conical ring, 503. Second extrusion conical ring, 6. Wedge-shaped interlocking part, 7. Reinforcing layer. Detailed Implementation

[0035] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0036] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0037] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0038] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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 disclosure.

[0040] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] like Figures 1-2 As shown, it illustrates a bolt-fastening anti-loosening washer in one embodiment of the present disclosure, comprising: a first elastic washer 1 having a compression ring groove 101 and a first through hole 102, the compression ring groove 101 being disposed around the first through hole 102; a plurality of elastic balls 2 being disposed within the compression ring groove 101, a first compression cone ring 3 being formed between the compression ring groove 101 and the first through hole 102, the minimum diameter of the first compression cone ring 3 being smaller than the diameter of the first through hole 102.

[0042] Before use, carefully inspect the first elastic washer 1 to ensure that its compression ring groove 101, first through hole 102, and first compression cone ring 3 are free of impurities, damage, and deformation. Otherwise, clean them with a clean cloth or detergent. Then, count the number of elastic balls 2 in the compression ring groove 101 to ensure they are complete and undamaged. Ensure that the minimum diameter of the first compression cone ring 3 is smaller than the diameter of the first through hole 102 to adapt to different connected parts and ensure good contact and friction between the washer and the connected parts and bolts.

[0043] The bolt is then inserted into the first through hole 102 of the first elastic washer 1. During insertion, the first compression conical ring 3 will first contact the bolt. Since the minimum diameter of the first compression conical ring 3 is smaller than the diameter of the first through hole 102 and it is elastic, it will adaptively deform according to the size of the bolt, initially wrapping the bolt and playing a certain positioning and fitting role. At the same time, the elastic ball 2 in the compression ring groove 101 will also adjust its position and elastically deform due to the compression of the bolt, further tightly fitting the bolt surface.

[0044] Finally, install the nut and screw it onto the bolt. As the nut is gradually tightened, the first elastic washer 1 is compressed and undergoes elastic deformation, applying a continuous clamping force to the nut and the connected parts. At the same time, the friction between the elastic ball 2 and the first compression cone ring 3 and the bolt increases, further preventing relative rotation between the bolt and the nut.

[0045] The first elastic washer 1, which is generally flat and circular, has a first through hole 102 at its center. Around the first through hole 102, there is a structure (extrusion ring groove 101) that is similar to an annular recess inside the washer. Multiple elastic balls 2 are arranged in the annular path along the annular recess. Both are made of elastic material. The advantage is that they are not easily deformed or damaged during long-term use and maintain stable anti-loosening performance. Specifically, spring steel or rubber materials, such as nitrile rubber, can be selected to maintain stable elastic deformation and anti-loosening effect. In addition, the first extrusion cone ring 3, which is integrally formed with the first elastic washer 1 between the extrusion ring groove 101 and the first through hole 102, is the key part of the entire washer to adapt to different connected parts. Therefore, the whole is truncated cone-shaped and integrally formed. Therefore, the material is the same as the first elastic washer 1, which is spring steel or rubber to ensure the strength and elasticity of the overall structure.

[0046] Unlike traditional methods of adapting to different connected parts, this anti-loosening washer uses several elastic balls 2 to squeeze the first compression cone ring 3 from all sides. When bolts of different sizes pass through the first through hole 102, the compression cone ring can use its own elastic deformation to initially wrap and adapt to the bolts, so that the inner ring of the washer can fit more precisely to the outer wall of the connected parts, thereby adapting to bolts of different sizes within a certain range.

[0047] It is important to note that during the use of the device, the condition of the anti-loosening washers needs to be checked regularly. This includes checking for excessive deformation or damage to the first elastic washer 1, whether the elastic ball 2 has fallen off or broken, and whether the nut shows signs of loosening. If any problems are found, they should be replaced or adjusted promptly. Additionally, if the working environment contains corrosive substances or experiences high temperatures, the suitability of the anti-loosening washer material must be considered. For example, in chemically corrosive environments, if the selected spring steel is not corrosion-resistant, additional protective measures, such as surface coating treatment, may be necessary to extend the service life of the anti-loosening washers.

[0048] like Figures 2-5 As shown, in some examples, the compression ring groove 101 has an opening 103, and the first elastic washer 1 also has a protective ring plate 104, which is located at the opening 103 and on one side of the elastic ball 2, with several elastic balls 2 abutting against the protective ring plate 104.

[0049] To prevent the elastic ball 2 from falling off under certain external forces, a protective ring plate 104 integrally formed with the first extrusion cone ring 3 is provided at the opening 103 to block the elastic ball 2 from one side, thereby extending the service life of the elastic ball 2 and ensuring the stability of the anti-loosening performance of the anti-loosening washer. The ring structure also provides a stable support surface for several elastic balls 2, so that the elastic ball 2 can undergo more uniform elastic deformation when compressed, which enhances the friction and compatibility between the entire anti-loosening washer and the bolt, and improves the anti-loosening effect.

[0050] Specifically, the cross-sectional shape can be either straight or bent. The straight protective ring plate 104 is straight and is set along the edge of the opening 103 of the extrusion ring groove 101, perpendicular to the plane of the first elastic washer 1, resembling a "door". This type of structure is simple and easy to process and manufacture. When configured, the protective ring plate 104 is tightly fitted to the edge of the opening 103 of the extrusion ring groove 101 and is fixedly connected to the first elastic washer 1 by welding or integral molding. The elastic ball 2 is tightly abutted against the inner side of the protective ring plate 104. The bent protective ring plate 104 is bent at a certain angle on the side near the elastic ball 2, forming an L-shaped structure. The bent part can better cover the elastic ball 2 and further enhance the limiting effect on the elastic ball 2.

[0051] like Figures 2-5 As shown, in some examples, the protective ring plate 104 is arc-shaped, there are two protective ring plates 104, and the two protective ring plates 104 are arranged alternately, with the elastic ball 2 located between the two protective ring plates 104.

[0052] The arc-shaped protective ring plate 104 can fit the spherical surface better and wrap around the elastic ball 2; the other two sets are spaced apart and can form an annular release between them. Although the width of the annular release ring is smaller than the diameter of the elastic ball 2, the annular release ring makes it easier to adjust, such as to maintain or replace the elastic ball 2 as a whole, so as to change the shape of the first extrusion cone ring 3, that is, its minimum diameter, so as to improve the compatibility of the anti-loosening washer with bolts of various specifications.

[0053] like Figure 6 As shown, in some examples, the first elastic washer 1 is the inner ring, and the elastic outer ring 4 is also sleeved on the outer wall of the first elastic washer 1.

[0054] The elastic outer ring 4 is fitted onto the outer wall of the first elastic washer 1, forming a double-layer structure. This effectively enhances the structural strength of the entire anti-loosening washer and shares part of the load borne by the first elastic washer 1. In addition, the two can form a kind of "disassembly and assembly" form, which makes it convenient to directly replace different "inner ring" structures to more accurately adapt to different connected parts.

[0055] like Figure 7As shown, in some examples, the elastic outer ring 4 and the second elastic washer 5 both have wedge-shaped engagement portions 6 around their perimeters. The wedge-shaped engagement portions 6 of the elastic outer ring 4 and the second elastic washer 5 engage with each other. The second elastic washer 5 also has a second through hole 501. The first through hole 102 and the second through hole 501 are coaxially arranged, and the diameter of the first through hole 102 is equal to the diameter of the second through hole 501.

[0056] To enhance the anti-loosening performance, the wedge-shaped engagement parts 6 of the outer rings of the elastic outer ring 4 and the second elastic washer 5 are interlocked to form a mechanical interlocking structure. When the nut is subjected to vibration or external force attempts to loosen it, this engagement structure generates additional resistance, preventing relative rotation between the elastic outer ring 4 and the second elastic washer 5, thereby limiting the loosening tendency of the nut and greatly enhancing the anti-loosening effect, making the bolt connection more stable and reliable.

[0057] In addition, the first through hole 102 and the second through hole 501 are coaxially arranged and have the same diameter, which ensures that the bolt can pass smoothly through the two washers, and that the two washers can be accurately aligned during installation, providing good conditions for the subsequent interlocking of the wedge-shaped meshing parts 6.

[0058] In specific use, unlike the above, before installing the nut, first put on the elastic outer ring 4 and the second elastic washer 5: align the second elastic washer 5 with the installed elastic outer ring 4, so that the wedge-shaped engagement part 6 of the second elastic washer 5 and the wedge-shaped engagement part 6 of the elastic outer ring 4 come closer to each other, slowly rotate the second elastic washer 5, so that the two wedge-shaped engagement parts 6 gradually mesh tightly, and finally tighten the nut.

[0059] like Figure 6 , Figure 7 , Figure 9 As shown, in some examples, the first elastic washer 1 has an inner conical annular surface 105 at the top, which is arranged around the compression annular groove 101, and the second elastic washer 5 also has an outer conical annular portion 502 at the bottom, which fits against the inner conical annular surface 105.

[0060] To facilitate the alignment of the second elastic washer 5 with the installed elastic outer ring 4, an inner conical ring surface 105 integrally formed with the first elastic washer 1 is further provided around the compression ring groove 101. An outer conical ring portion 502 that matches the shape of the inner conical ring surface 105 is formed together at the bottom of the second elastic washer 5. The two are finally tightly fitted together, which can achieve precise alignment and ensure coaxiality.

[0061] like Figure 8 As shown, in some examples, the second elastic washer 5 also has a second compression cone ring 503 at the top, the minimum diameter of the second compression cone ring 503 being equal to the diameter of the second through hole 501.

[0062] Additionally, a second compression cone ring 503, resembling a "trumpet" shape, is integrally formed on the top of the second elastic washer 5. The minimum diameter of the second compression cone ring 503 is equal to the diameter of the second through hole 501. When the nut is finally installed, the second compression cone ring 503 undergoes elastic deformation under the pressure of the nut, tightly wrapping around the bolt. This keeps the upper part of the washer in a flat state, quickly filling any gaps or relative slippage between the connectors to maintain the reliability and tightness of the connection, further enhancing the anti-loosening effect.

[0063] like Figure 9 As shown, in some examples, the top of the second elastic washer 5 and the bottom of the first elastic washer 1 also have a reinforcing layer 7, which includes a zinc-steel alloy layer and a hot-dip galvanized layer.

[0064] The reinforcing layer 7 is set at the top of the second elastic washer 5 and the bottom of the first elastic washer 1, which can significantly enhance the structural strength of these two key parts, prevent the elastic washer from deforming or being damaged, and extend the service life of the anti-loosening washer. Therefore, a zinc-steel alloy layer and a hot-dip galvanized layer are used, with the latter covering the surface of the zinc-steel alloy layer, which plays a good role in corrosion protection. In humid environments with a risk of chemical corrosion, the hot-dip galvanized layer can prevent moisture, oxygen and corrosive substances from contacting the internal elastic washer and zinc-steel alloy layer, preventing the metal from rusting and corroding.

[0065] Alternatively, nano-ceramic coatings, high-strength fiber-reinforced polymers, or thermally sprayed alloy layers can be selected. Each coating has high hardness and wear resistance, effectively resisting wear generated on the top when subjected to nut tightening pressure and external friction.

[0066] like Figure 10 As shown, in some examples, the bottom of the first elastic washer 1 also has several anti-slip protrusions 106, which are arranged circumferentially around the first through hole 102.

[0067] The bottom of the first elastic washer 1 is also integrally formed with several circumferentially arranged anti-slip protrusions 106, which further improves the anti-slip effect. These protrusions break the relatively smooth contact state between the washer and the connected parts, and significantly increase the friction between the two. During the tightening of the nut and the operation of the subsequent device, even if subjected to external forces such as vibration and impact, the increased friction makes it more difficult for the first elastic washer 1 and the connected parts to slide relative to each other, thereby ensuring the stability of the anti-loosening washer position.

[0068] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A bolt-fastening anti-loosening washer, characterized in that, include: A first elastic washer (1) has a compression ring groove (101) and a first through hole (102), wherein the compression ring groove (101) is arranged around the first through hole (102); A plurality of elastic balls (2) are disposed in the extrusion ring groove (101), and a first extrusion cone ring (3) is formed between the extrusion ring groove (101) and the first through hole (102). The minimum diameter of the first extrusion cone ring (3) is smaller than the diameter of the first through hole (102).

2. The anti-loosening washer for bolt fastening according to claim 1, characterized in that, The compression groove (101) has an opening (103), and the first elastic washer (1) also has a protective ring plate (104). The protective ring plate (104) is located at the opening (103) and on one side of the elastic ball (2). Several elastic balls (2) abut against the protective ring plate (104).

3. The anti-loosening washer for bolt fastening according to claim 2, characterized in that, The protective ring plate (104) is arc-shaped, there are two protective ring plates (104), and the two protective ring plates (104) are arranged at intervals. The elastic ball (2) is located between the two protective ring plates (104).

4. A bolt-fastening anti-loosening washer according to any one of claims 1 to 3, characterized in that, The first elastic washer (1) is an inner ring, and further includes: The elastic outer ring (4) is sleeved on the outer wall of the first elastic washer (1).

5. The anti-loosening washer for bolt fastening according to claim 4, characterized in that, Also includes: The second elastic washer (5) has wedge-shaped engagement portions (6) around the elastic outer ring (4) and around the second elastic washer (5). The wedge-shaped engagement portions (6) of the elastic outer ring (4) and the wedge-shaped engagement portions (6) of the second elastic washer (5) engage with each other. The second elastic washer (5) also has a second through hole (501). The first through hole (102) and the second through hole (501) are coaxially arranged, and the diameter of the first through hole (102) is equal to the diameter of the second through hole (501).

6. The anti-loosening washer for bolt fastening according to claim 5, characterized in that, The first elastic washer (1) has an inner conical annular surface (105) at the top, which is arranged around the compression ring groove (101). The second elastic washer (5) has an outer conical annular portion (502) at the bottom, which fits against the inner conical annular surface (105).

7. The anti-loosening washer for bolt fastening according to claim 5, characterized in that, The second elastic washer (5) has a second extrusion cone ring (503) at the top, and the minimum diameter of the second extrusion cone ring (503) is equal to the diameter of the second through hole (501).

8. The anti-loosening washer for bolt fastening according to claim 5, characterized in that, The second elastic washer (5) has a top layer (7) and the first elastic washer (1) has a bottom layer (7).

9. A bolt-fastening anti-loosening washer according to claim 8, characterized in that, The reinforcing layer (7) includes a zinc-steel alloy layer and a hot-dip galvanized layer.

10. A bolt-fastening anti-loosening washer according to claim 5, characterized in that, The bottom of the first elastic washer (1) also has a number of anti-slip protrusions (106), and the number of anti-slip protrusions (106) are arranged circumferentially around the first through hole (102).

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