Grounding device

Abstract

The grounding device comprises a bolt and a nut, the nut is detachably installed on the bolt, the bolt comprises a bolt head and a screw rod, the bolt head comprises a welding part and a bolt supporting surface, the bolt supporting surface is close to the screw rod, the welding part is far away from the screw rod, the outer wall of the screw rod is provided with an external thread, and the external thread is connected with the nut. A nut supporting face is arranged at the end of the nut, the bolt and the nut each comprise a base body and a reinforcing layer, the reinforcing layers are located on the partial surface and the whole surface of the base body, and on the premise that effective fastening connection and effective electric conduction are provided, the welding phenomenon caused by friction between the bolt and the nut during installation can be relieved; the bolt and the nut are prevented from loosening in a vibration environment, the problem of seizure generated in the mounting and dismounting processes in the assembling process and the subsequent maintenance process is solved, and an effective and stable low-resistance conductive function is continuously provided.

Description

Technical Field

[0001] The utility model belongs to the technical field of grounding devices, and in particular relates to a grounding device. Background Art

[0002] At present, in order to ensure the stability and safety of the electrical system, a grounding device is often used to connect the wiring harness. When applied to the automotive field, the positive pole of the appliance is connected to the positive pole of the battery through the wiring harness, and the negative pole of the appliance is connected to the vehicle body and structural parts through the nearest grounding device. The current is collected through the vehicle body and connected to the negative pole of the battery to reduce the voltage difference between electrical equipment, saving costs while preventing electrical function failure caused by the voltage difference of each appliance. The grounding device can also provide a closed path for the current loop to ensure the normal operation of the electrical system. The firm contact between the grounding device and the wiring harness can ensure the smooth flow of current, and it is also convenient for maintenance and replacement of the wiring harness.

[0003] However, the existing grounding devices have the following problems:

[0004] (1) Since the car is in a state of vibration for a long time while driving, it is easy to cause the grounding device and the wiring harness to become loose or have poor contact;

[0005] (2) Welding or seizing caused by friction between the bolt and nut during installation, that is, during the threaded connection process, the surface of the thread wears out, causing the materials between the bolt and the nut to absorb each other, making it impossible to remove and separate the bolt and the nut. The welding or seizing phenomenon will also cause the nut to get stuck on the screw of the bolt and be unable to move downward, and the wiring harness cannot be fixed.

[0006] Therefore, how to overcome the problem of welding between the bolts and nuts during installation and ensure a firm contact and a stable low resistance state between the grounding device and the wiring harness is a problem that existing technicians urgently need to solve. Utility Model Content

[0007] In order to solve the above problems, the utility model provides a grounding device for overcoming the problem of welding between bolts and nuts during installation and ensuring a firm contact and a stable low resistance state between the grounding device and the wiring harness.

[0008] The technical solution of the utility model is:

[0009] The utility model discloses a grounding device, comprising a bolt and a nut, wherein the nut can be detachably mounted on the bolt, the bolt comprises a bolt head and a screw rod, the bolt head comprises a welding portion and a bolt supporting surface, the outer wall of the screw rod is provided with an external thread, the nut comprises a nut supporting surface, the bolt and the nut both comprise a substrate and a reinforcing layer, and the reinforcing layer is located on a partial surface or the entire surface of the substrate; wherein; the reinforcing layers of the bolt and the nut are reinforcing layers formed of different or identical materials; the reinforcing layers located on the bolt supporting surface and the nut supporting surface are any one of a sandblasting layer, a passivation layer, a tin-zinc-plated layer, a galvanized layer, a zinc-nickel-plated layer, and a copper-plated layer; the reinforcing layer located inside the external thread and the nut matched with the external thread is any one of a sandblasting layer, an oxidation layer, a passivation layer, a ceramic layer, a tin-zinc-plated layer, a galvanized layer, a zinc-nickel-plated layer, and a copper-plated layer.

[0010] Furthermore, the substrate is any one of an aluminum layer, an aluminum alloy layer, and a carbon steel layer; the reinforcement layers of the bolt and the nut are reinforcement layers formed of different materials; the bolt and the nut also include a wax layer, and the wax layer is arranged on the surface of the reinforcement layer.

[0011] Further, when any one of an oxide layer, a ceramic layer or a wax layer is provided on the external thread or the inner wall of the nut, the bolt support surface and the nut support surface are only a substrate, and there is no other coating outside the substrate; or the bolt support surface and the nut support surface are provided with any one of a sandblasting layer, a passivation layer, a tin-zinc plating layer, a zinc-plating layer, a zinc-nickel plating layer, and a copper-plating layer on the substrate.

[0012] Furthermore, the nut support surface and the bolt support surface are both provided with friction patterns; and the reinforcement layers of the bolt and the nut are reinforcement layers formed of different materials.

[0013] Furthermore, the welding portion is provided with a cone or a plurality of polygonal bodies, and the tail of the screw is in the shape of a non-threaded cylinder or a truncated cone.

[0014] Furthermore, when the welding portion is provided with a cone, the inclination gradient of the welding portion is 8°-12°.

[0015] Furthermore, the nut is in a blind hole shape, and the inner wall of the nut is a smooth surface or an internal thread.

[0016] Furthermore, it also includes a cap, the nut is in the shape of a through hole, the cap is arranged in the nut, and the cap is fixedly connected between the nuts.

[0017] Furthermore, the cap is in any one of a flat shape, an arc shape, and a spherical shape.

[0018] Furthermore, the outer wall of the upper half of the nut is in the shape of a hexagonal column, the outer wall of the lower half of the nut is in the shape of a cylinder, or the entire body of the nut is in the shape of a hexagonal column with edges that are large arcs.

[0019] Furthermore, the top of the nut is spherical cap-shaped, the middle part is hexagonal column-shaped, and the lower part is cylindrical.

[0020] The beneficial effects of the utility model are:

[0021] (1) A process of combining a metal substrate and a reinforcing layer is adopted, which has a simple structure and directly and effectively solves the problem of biting. At the same time, the technical solution provided by the present application can use high-strength non-metallic materials as the reinforcing layer without affecting the conductivity, so the selection space is wider, which is conducive to cost saving and improving the application field of the product: the specific reinforcing layer is located on part or all of the surface of the substrate. When the reinforcing layer located on the bolt support surface and the nut support surface is any one of a sandblasting layer, a passivation layer, a tin-zinc layer, a galvanized layer, a zinc-nickel layer, and a copper-plated layer, and the reinforcing layer located on the external thread and the inside of the nut matched with the external thread is any one of a sandblasting layer, an oxide layer, a passivation layer, a ceramic layer, a tin-zinc layer, a galvanized layer, a zinc-nickel layer, and a copper-plated layer, the sandblasting layer, the passivation layer, the tin-zinc layer, the galvanized layer, the zinc-nickel layer, and the copper-plated layer The zinc layer, zinc-plated layer, zinc-nickel-plated layer, and copper-plated layer can all increase the hardness of bolts and nuts and maintain good conductivity. The oxide layer and ceramic layer have higher hardness, better wear resistance, and better corrosion resistance than the sandblasting layer, passivation layer, tin-zinc-plated layer, zinc-plated layer, zinc-nickel-plated layer, and copper-plated layer. On the premise of providing effective fastening connection and effective conductivity, they can alleviate the welding phenomenon caused by friction between bolts and nuts during installation, and prevent paint from penetrating between the supporting surfaces of bolts and nuts when the vehicle is electrophoresed after the bolts are welded. They solve the problem of seizure caused by installation and disassembly during the assembly process and subsequent maintenance, continuously provide effective, stable, low-resistance conductive function, and prevent bolts and nuts from loosening in a vibrating environment.

[0022] (2) A preferred solution with better effect is to use different materials for the reinforcing layers of the bolts and nuts, which can better prevent the problem of biting. At the same time, for non-metallic materials used as the reinforcing layers, a solution of partially covering the reinforcing layers is adopted to ensure that the supporting surface can maintain good conductivity while saving costs. Because the reinforcing layers of the bolt supporting surface and the nut supporting surface are any one of sandblasting layer, passivation layer, tin-zinc plating layer, galvanized layer, zinc-nickel plating layer, and copper plating layer, and the reinforcing layer located inside the external thread and the nut matching the external thread is any one of sandblasting layer, oxide layer, passivation layer, ceramic layer, tin-zinc plating layer, galvanized layer, zinc-nickel plating layer, and copper plating layer, the present invention solves the welding phenomenon caused by the friction between the bolt and the nut during installation from the perspective of improving the hardness of the bolt or nut and designing the friction surface as different types of metals or metal coatings.

[0023] The solution of the present application greatly improves the anti-seizure performance of the conductive grounding device, has a simple structure, a concise process, saves costs, and improves the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the combined state of the bolt and the nut of Example 1 of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the bolt of Example 1 of the utility model;

[0026] Figure 3 This is a schematic structural diagram of a nut according to Embodiment 1 of the present utility model;

[0027] Figure 4 The hierarchical structure of the bolts in Example 1 of the utility model is shown in FIG. Figure 1 ;

[0028] Figure 5 The hierarchical structure of the bolts in Example 1 of the utility model is shown in FIG. Figure 2 ;

[0029] Figure 6 The hierarchical structure of the bolts in Example 1 of the utility model is shown in FIG. Figure 3 ;

[0030] Figure 7 The hierarchical structure of the nut of the first embodiment of the utility model is shown in FIG. Figure 1 ;

[0031] Figure 8 The hierarchical structure of the nut of the first embodiment of the utility model is shown in FIG. Figure 2 ;

[0032] Fig. 9 The hierarchical structure of the nut of the first embodiment of the utility model is shown in FIG. Figure 3 ;

[0033] Fig.10 This is a front view structural diagram of a bolt in Embodiment 1 of the utility model;

[0034] Fig.11 This is a schematic diagram of the structure of a bolt in Embodiment 4 of the present utility model;

[0035] Fig.12 This is a schematic diagram of the structure in which the external thread on the bolt of Example 4 of the utility model is a self-tapping screw;

[0036] Fig.13 It is a structural schematic diagram of the nut of the utility model in a blind hole state;

[0037] Fig.14It is a schematic diagram of the exploded structure of the bolt, nut and cap of the utility model;

[0038] Fig.15 This is a schematic diagram of the first installation structure when the gasket of the utility model is in an arc shape;

[0039] Fig.16 This is a schematic diagram of a second installation structure when the gasket of the utility model is in an arc shape;

[0040] Fig.17 This is a schematic structural diagram of a nut according to Embodiment 2 of the present utility model;

[0041] Fig.18 This is a schematic diagram of the structure of the combined state of the bolt and the nut of Example 2 of the utility model;

[0042] Fig.19 This is a schematic diagram of the structure of the combined state of the bolt and the nut of Example 4 of the utility model;

[0043] Fig. 20 This is a schematic diagram of the structure of the combined state of the bolt and the nut of Example 5 of the utility model;

[0044] Fig.21 This is a schematic diagram of the three-dimensional structure of the bolt and nut in the combined state of Example 7 of the utility model;

[0045] Fig. 22 This is a front view structural schematic diagram of the combined state of the bolt and the nut of Example 7 of the utility model.

[0046] Figure numerals: 1. bolt, 11. bolt head, 111. welding portion, 112. bolt supporting surface, 12. screw rod, 121. external thread, 2. nut, 21. nut supporting surface, 22. internal thread, 3. base, 4. reinforcement layer, 5. cap, 6. wax layer. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] It should be noted that when a component is referred to as being "installed on", "provided on", "covered on", "sleeved on", or "locked on" another component, it can be directly on the other component or indirectly on the other component.

[0049] It should be understood that, in the description of the present utility model, “several” means two or more than two, unless otherwise clearly and specifically defined.

[0050] In addition, the orientations or positional relationships indicated by terms such as "inside", "upper", "between", "both sides", "one side", "top", "bottom", and "side" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] It should be noted that the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the features.

[0052] It should be noted that the "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. Among them, A and B can be singular or plural respectively.

[0053] Invention concept:

[0054] First, the bolt 1 and the nut 2 will become loose due to vibration because the clamping force between them will inevitably attenuate under vibration conditions; secondly, to solve the welding or biting phenomenon during the installation of the bolt 1 and the nut 2, there are three ideas. The first is to increase the hardness of the bolt 1 or the nut 2 respectively to prevent the surface of the bolt 1 and the nut 2 from being worn during the spiral process, and to prevent fine chips or burrs from being generated, resulting in mutual absorption of materials; the second is to increase lubrication, which is also to reduce the wear on the surface of the bolt 1 and the nut 2 during the spiral process; the third is to design the friction surface to be different types of metals or metal coatings.

[0055] Please refer to Figure 1-Figure 20The present invention provides a grounding device, including a bolt 1 and a nut 2, wherein the nut 2 can be detachably mounted on the bolt 1, the bolt 1 includes a bolt head 11 and a screw 12, the bolt head 11 includes a welding portion 111 and a bolt supporting surface 112, the bolt head 11 and the screw 12 are integrally formed, the bolt supporting surface 112 is located at one end of the bolt head 11 close to the screw 12, the welding portion 111 is located at one end of the bolt head 11 away from the screw 12, the outer wall of the screw 12 is provided with an external thread 121, the external thread 121 can be an ordinary mechanical thread or a self-extrusion thread, that is, the screw 12 has the characteristics of an ordinary mechanical thread or a self-extrusion thread. The nut 2 includes a nut supporting surface 21, and the bolt 1 and the nut 2 both include a base 3 and a reinforcing layer 4, and the reinforcing layer 4 is located on a partial surface or the entire surface of the base 3, wherein; the reinforcing layers 4 of the bolt 1 and the nut 2 are reinforcing layers formed of different or the same materials; the reinforcing layer 4 located on the bolt supporting surface 112 and the nut supporting surface 21 is any one of a sandblasting layer, a passivation layer, a tin-zinc layer, a zinc-plated layer, a zinc-nickel layer, and a copper-plated layer; the reinforcing layer 4 located inside the external thread 121 and the nut 2 matched with the external thread 121 is any one of a sandblasting layer, an oxide layer, a passivation layer, a ceramic layer, a tin-zinc layer, a zinc-plated layer, a zinc-nickel layer, and a copper-plated layer.

[0056] Specifically, the reinforcing layer 4 of the bolt 1 is arranged on the outer surface of its base 3, that is, on the external thread 121, and the reinforcing layer 4 of the nut 2 is arranged on the inner and outer surfaces of its base 3, that is, the inside of the nut 2 and the surface of the nut 2 that cooperates with the external thread 121.

[0057] When the reinforcing layer located on the bolt supporting surface and the nut supporting surface is any one of a sandblasting layer, a passivation layer, a tin-zinc plating layer, a galvanized layer, and a galvanized nickel plating layer, and the reinforcing layer located inside the external thread and the nut matched with the external thread is any one of a sandblasting layer, an oxide layer, a passivation layer, a ceramic layer, a tin-zinc plating layer, a galvanized layer, a galvanized nickel plating layer, and a copper plating layer, the sandblasting layer, the passivation layer, the tin-zinc plating layer, the galvanized layer, the galvanized nickel plating layer, and the copper plating layer can improve the hardness of the bolt and the nut and have conductivity, and the oxide layer and the ceramic layer are relatively more conductive than the sandblasting layer, the passivation layer, the tin-zinc plating layer, The galvanized layer, zinc-nickel layer and copper-plated layer have higher hardness, better wear resistance and better corrosion resistance; they can prevent bolts and nuts from loosening in a vibrating environment while providing effective fastening and effective conductivity; they can alleviate the welding phenomenon caused by friction between bolts and nuts during installation, and prevent paint from penetrating between the supporting surfaces of bolts and nuts when the vehicle is electrophoresed after the bolts are welded; they solve the problem of sticking caused by installation and disassembly during the assembly process and subsequent maintenance, and continue to provide effective, stable and low-resistance conductive functions.

[0058] When the nut 2 is installed on the bolt 1, and the wiring harness is clamped between the nut support surface 21 and the bolt support surface 112, the bolt support surface 112 and the nut support surface 21 form a contact area with relatively large friction. The nut support surface 21 and the bolt support surface 112 are both provided with friction lines, and the friction lines are in the shape of annual rings. It is worth noting that friction lines may not be provided on the support surfaces of the bolt and the nut. The flatness of the bolt support surface 112 and the flatness of the nut support surface 21 are both not greater than 0.029 mm. The flatness is not greater than 0.029 mm, which can ensure the optimal contact state and sealing between the mother support surface 21 and the bolt support surface 112. Since the annual ring-shaped lines between the bolt 1 and the nut 2 are meshed with each other, it can also further prevent the bolt 1 and the nut 2 from loosening in a vibrating environment, improve the sealing performance to prevent the infiltration of paint in subsequent processes, and improve the conductivity.

[0059] It is worth noting that anodizing and micro-arc oxidation can only be performed when the matrix 3 of the bolt 1 or the nut 2 is an aluminum layer or an aluminum alloy layer, and the reinforcing layer 4 located on the external thread of the bolt 1 or inside the nut 2 can be any one of an aluminum oxide layer, an aluminum ceramic layer, an aluminum sandblasting layer, an aluminum passivation layer, an aluminum tin-zinc layer, and an aluminum copper layer; the reinforcing layer 4 located on the bolt support surface 112 and the nut support surface 21 is any one of an aluminum sandblasting layer, an aluminum passivation layer, an aluminum tin-zinc layer, and an aluminum copper layer; when the matrix 3 of the bolt 1 is a carbon steel layer, the reinforcing layer 4 located on the external thread of the bolt 1 or inside the nut 2 can be any one of an iron sandblasting layer, an iron passivation layer, an iron tin-zinc layer, an iron zinc-plated layer, and an iron zinc-plated nickel layer, and the reinforcing layer 4 located on the bolt support surface 112 and the nut support surface 21 is any one of an iron sandblasting layer, an iron passivation layer, an iron tin-zinc layer, an iron zinc-plated layer, and an iron zinc-plated nickel layer.

[0060] The base 3 of the bolt 1 and the nut 2 is any one of aluminum, aluminum alloy, and carbon steel; the bolt 1 and the nut 2 also include a wax layer 6, which is used to replace the reinforcement layer 4, or the wax layer 6 is arranged on the surface of the reinforcement layer 4.

[0061] When any one of an oxide layer, a ceramic layer or a wax layer 6 is provided on the external thread 121 or the inner wall of the nut 2, the bolt support surface 112 and the nut support surface 21 are only provided with a substrate 3, and there is no other coating outside the substrate 3; or the bolt support surface 112 and the nut support surface 21 are provided with any one of a sandblasting layer, a passivation layer, a tin-zinc plating layer, a zinc-plating layer, a zinc-nickel plating layer, and a copper-plating layer on the substrate 3.

[0062] The specific plans are as follows:

[0063] When the base 3 of the bolt 1 and the nut 2 is an aluminum layer or an aluminum alloy layer, the external thread 121 of the bolt 1 and the reinforcement layer 4 located inside the nut 2 are an oxide layer or a ceramic layer, and there is no oxide layer or a ceramic layer on the bolt support surface 112 and the nut support surface 21.

[0064] The wax layer 6 is arranged on the surface of the reinforcing layer 4 , that is, the surface of the oxide layer or the ceramic layer is provided with the wax layer 6 , and the wax layer 6 cannot be attached to the bolt supporting surface 112 and the nut supporting surface 21 .

[0065] The wax layer 6 is used to replace the reinforcement layer 4 , that is, the reinforcement layer 4 of the external thread 121 of the bolt 1 is replaced by the wax layer 6 , and there is no wax layer on the bolt support surface 112 .

[0066] Among them, the sandblasting layer is made by shot blasting process. The high-speed sand impact and friction generated in the shot blasting process will change the lattice structure of the surface, thereby increasing the hardness. The sand will not adhere to the surface of the substrate, but remove the oxide layer and dirt on the surface through impact and friction. The sandblasting layer changes the surface of the raw material to form a harder surface; the oxide layer is formed by anodizing the surface of the substrate 3 to form a high-hardness, wear-resistant and corrosion-resistant oxide protective film; the passivation layer is formed by drying the parts after immersing them in titanium passivation solution, and the ceramic layer is formed by micro-arc discharge on the surface of the substrate 3. The zinc-nickel plating layer is a zinc layer after the nickel intermediate layer is plated on the surface of the substrate 3; the zinc-plated layer is a zinc layer formed after electroplating zinc on the surface of the substrate 3; the tin-zinc plating layer is a tin-zinc plating layer formed after electroplating tin-zinc alloy on the surface of the substrate 3.

[0067] When the reinforcement layers 4 of the bolt 1 and the nut 2 are formed of different materials, the following specific solutions are available:

[0068] (1) The reinforcing layer 4 of the external thread 121 of the bolt 1 is an oxide layer, the reinforcing layer of the bolt support surface 112 is a passivation layer, the reinforcing layer 4 of the inner wall and outer surface of the nut is a ceramic layer, and the reinforcing layer 4 of the nut support surface 21 is a tin-zinc layer;

[0069] (2) The reinforcing layer 4 of the external thread 121 of the bolt 1 is a ceramic layer, the reinforcing layer of the bolt support surface 112 is a passivation layer, the reinforcing layer 4 of the inner wall and outer surface of the nut is an oxide layer, and the reinforcing layer 4 of the nut support surface 21 is a tin-zinc layer;

[0070] (3) The external thread 121 of the bolt 1 and the reinforcing layer 4 of the bolt support surface 112 are both passivation layers, and the inner wall, outer surface and reinforcing layer 4 of the nut support surface 21 are both tin-zinc-plated layers.

[0071] There are N kinds of combination schemes, which are not listed here; and the above is from the third idea: designing the friction surface to be different types of metals or metal coatings to solve the problem of welding or biting of bolts and nuts. Different materials can prevent the materials between the bolts and nuts from absorbing each other.

[0072] Summarize:

[0073] 1) The above structural layers are divided into conductive layers and non-conductive layers. The conductive layers are: passivation layer, tin-zinc plating layer, zinc plating layer, zinc-nickel plating layer, copper plating layer; the non-conductive layers are: wax layer, oxide layer, ceramic layer;

[0074] 2) The oxide layer, ceramic layer, passivation layer, tin-zinc plating layer, zinc plating layer, zinc-nickel plating layer, and copper plating layer can all increase the hardness of the bolts and nuts, and the wax layer 6 plays a lubricating role;

[0075] 3) Since the electrical conductivity between the bolt 1 and the nut 2 needs to be ensured, when the thread of the bolt or the inner wall of the nut is provided with a non-conductive layer, its supporting surface must be conductive;

[0076] 4) Oxide layer and ceramic layer are usually provided on the surface of aluminum or aluminum alloy;

[0077] Therefore, as long as the above principles are met, multiple groups of solutions can be combined between the base 3, reinforcement layer 4 and wax layer 6 of the bolt 1 and the nut 2. From the three aspects of improving hardness, increasing lubrication, and designing the friction surface as different types of metals or metal coatings, the problem of sticking caused by installation and disassembly during the assembly process and subsequent maintenance can be solved, and effective, stable, low-resistance conductive function can be continuously provided.

[0078] In addition, the reinforcing layer 4 also increases the clamping force between the bolt 1 and the nut 2, reduces the friction between them, solves the problem of anti-loosening, and prevents the friction from generating fine chips or burrs that lead to mutual absorption;

[0079] Therefore, the reinforcement layer 4 can solve the problems of preventing loosening and preventing seizure at the same time.

[0080] The grounding device can also be designed in different shapes, as follows:

[0081] Example 1

[0082] Reference Figure 1-Figure 10 In order to increase the weldability and welding strength of the bolt 1 body, the welding portion 111 is provided with a cone, and the inclination slope of the welding portion 111 is specifically 9°. Since the contact portion 111 of the bolt 1 is connected to the aluminum alloy part of the body, the 9° inclination slope design enables the contact portion 111 to generate an arc suitable for welding when welding with the aluminum alloy part to facilitate welding.

[0083] The tail of the screw rod 12 is in the shape of a truncated cone, which can more conveniently guide the bolt 1 and the nut 2 to be aligned, so that the nut can be automatically introduced into the bolt without precise alignment, avoiding damage to the thread.

[0084] The nut 2 is in the shape of a blind hole, and the inner wall of the nut 2 is provided with an internal thread 22, which matches the external thread 121. The outer wall of the upper half of the nut 2 is in the shape of a hexagonal column, and the outer wall of the lower half of the nut 2 is in the shape of a cylinder.

[0085] Example 2

[0086] Reference Fig.17 and Fig.18 The difference from Example 1 is that the nut 2 is in the shape of a hexagonal column with large arc edges.

[0087] Example 3

[0088] Reference Fig.11 , Fig.12 and Fig.19 , which is different from Example 1 in that the base 3 of the nut 2 is a carbon steel layer, and the welding portion 111 is provided with a plurality of polygons. Fig.12 The external thread 121 of the bolt 1 is a self-tapping thread, and the inner wall of the nut 2 is a smooth surface. The bolt 1 rotates along the nut 2 to squeeze out the internal thread 22 of the inner wall of the nut 2.

[0089] Example 4

[0090] Reference Fig.19 , which is different from the embodiment 1 in that the welding portion 111 is provided with a plurality of polygons. When the welding portion 111 of the bolt 1 is fixedly connected with the aluminum alloy or carbon steel parts of the vehicle body, the polygonal design enables the contact portion 111 to be applied to plates or parts with relatively small thickness, so as not to burn through the parent material during the welding process.

[0091] Example 5

[0092] Reference Fig. 20 , which is different from Example 4 in that the entire outer wall of the nut 2 is in the shape of a hexagonal column, and its top angle is an arc.

[0093] Example 6

[0094] Reference Fig.14 , which is different from Example 1, is that it further includes a cap 5, the nut 2 is in the shape of a through hole, and the cap 5 is arranged in the nut 1. Specifically, one end of the cap 5 is welded or riveted to the nut 2, and the nut 2 and the bolt 1 are protected by the cap 5.

[0095] Example 7

[0096] Reference Fig.21 and Fig. 22 , using Figure 2 The bolts, Fig.13 The nut 2 is in a blind hole shape, the base of the bolt is an aluminum layer or an aluminum alloy layer, and the reinforcing layer located on the external thread of the bolt is a titanium passivation layer; the base of the nut is a carbon alloy layer, and the reinforcing layer located on the inner wall / internal thread of the nut is an iron galvanized layer.

[0097] In addition, refer to Fig.15 and Fig.16 The present invention also has other variations. The cap 5 may be in an arc shape. Specifically, it may be convex to an outward convex arc shape, or concave to an inward concave arc shape.

[0098] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A grounding device, comprising a bolt (1) and a nut (2), wherein the nut (2) is detachably mounted on the bolt (1), wherein the bolt (1) comprises a bolt head (11) and a screw rod (12), wherein the bolt head (11) comprises a welding portion (111) and a bolt support surface (112), wherein the outer wall of the screw rod (12) is provided with an external thread (121), wherein the nut (2) comprises a nut support surface (21), wherein the bolt (1) and the nut (2) both comprise a base (3) and a reinforcement layer (4), wherein: The reinforcing layer (4) is located on part of or all of the surface of the substrate (3); wherein the reinforcing layers (4) of the bolt (1) and the nut (2) are reinforcing layers formed of different or identical materials; the reinforcing layer (4) located on the bolt support surface (112) and the nut support surface (21) is any one of a sandblasting layer, a passivation layer, a tin-zinc plating layer, a zinc-plating layer, a zinc-nickel plating layer, and a copper-plating layer; and the reinforcing layer (4) located inside the external thread (121) and the nut (2) matched with the external thread (121) is any one of a sandblasting layer, an oxide layer, a passivation layer, a ceramic layer, a tin-zinc plating layer, a zinc-plating layer, a zinc-nickel plating layer, and a copper-plating layer.

2. The grounding device according to claim 1, characterized in that: The substrate (3) is any one of an aluminum layer, an aluminum alloy layer, and a carbon steel layer; the reinforcing layers (4) of the bolt (1) and the nut (2) are reinforcing layers formed of different materials; the bolt (1) and the nut (2) further include a wax layer (6), and the wax layer (6) is arranged on the surface of the reinforcing layer (4).

3. The grounding device according to claim 2, characterized in that: When any one of an oxide layer, a ceramic layer or a wax layer (6) is provided on the external thread (121) or on the inner wall of the nut (2), the bolt support surface (112) and the nut support surface (21) are only provided with a substrate (3), and no other coating is provided outside the substrate (3); or the bolt support surface (112) and the nut support surface (21) are provided with any one of a sandblasting layer, a passivation layer, a tin-zinc plating layer, a zinc plating layer, a zinc-nickel plating layer, and a copper plating layer on the substrate (3).

4. The grounding device according to claim 1, characterized in that: The nut support surface (21) and the bolt support surface (112) are both provided with friction patterns; the reinforcement layers (4) of the bolt (1) and the nut (2) are reinforcement layers formed of different materials; the welding portion (111) is provided with a cone or a plurality of polygonal bodies, and the tail of the screw rod (12) is in the shape of a non-threaded cylinder or a truncated cone.

5. The grounding device according to claim 4, characterized in that: When the welding portion (111) is provided with a cone, the inclination gradient of the welding portion (111) is 8°-12°.

6. The grounding device according to claim 1, characterized in that: The nut (2) is in the shape of a blind hole, and the inner wall of the nut (2) is a smooth surface or an internal thread (22).

7. The grounding device according to claim 1, characterized in that: It also comprises a cap (5), the nut (2) is in the shape of a through hole, the cap (5) is arranged inside the nut (2), and the cap (5) is arranged between the nuts (2) and fixedly connected.

8. The grounding device according to claim 7, characterized in that: The cap (5) is in any one of a flat shape, an arc shape, and a spherical shape.

9. The grounding device according to claim 1, characterized in that: The outer wall of the upper half of the nut (2) is in the shape of a hexagonal column, the outer wall of the lower half of the nut (2) is in the shape of a cylinder, or the entire body of the nut (2) is in the shape of a hexagonal column with large arc edges.

10. The grounding device according to claim 1, characterized in that: The nut (2) has a spherical cap-shaped top, a hexagonal column-shaped middle, and a cylindrical bottom.

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