Shooting nail, nail gun, metal grating fixing system and electrical grounding system

Abstract

The utility model discloses a shoot nail, a shoot nail gun, a metal grating fixing system and an electrical grounding system, the shoot nail comprises a screw rod and a nail head, and the nail head comprises a disc spring part, an inverted circular truncated cone part and a cylindrical part in sequence from top to bottom; the heights of the disc spring part, the inverted circular truncated cone part and the cylindrical part are respectively H1, H2 and H3, the disc spring part, the inverted circular truncated cone part and the cylindrical part are respectively provided with three side surfaces C1, C2 and C3, the minimum diameter of the disc spring part is D1, the diameter of the top surface of the inverted circular truncated cone part is D2, the diameter of the bottom surface of the inverted circular truncated cone part is D3, the diameter of the cylindrical part is D4, and the shooting nail is driven into a blind hole of the metal base material through gunpowder. And a first welding area Q1 is formed between the side face C2 of the inverted circular truncated cone part and the inner wall of the blind hole, a second welding area Q2 is formed between the side face C3 of the cylindrical part and the inner wall of the blind hole, and a third welding area Q3 is formed between the end face of the shoot nail and the bottom of the blind hole. According to the novel shoot nail, excellent drawing force is obtained, and meanwhile the good CNC machining characteristic is achieved.

Description

Technical Field

[0001] The invention relates to an installation and fixing device for an object, in particular to a nail, a nail gun, a metal grid fixing system and an electrical grounding system. Background Art

[0002] A nail is generally composed of a nail head and a screw. The nail head can be driven into a base such as concrete, rock, or metal by a power source such as gunpowder or gas, and the screw is used for installation and fixing. In order to improve the pull-out force of nails, a variety of different solutions have been proposed, such as Fig.10 As shown in Figure A, CN217735964U discloses a nail with a cylindrical nail head; CN110506166A discloses a fixing method and a fixing system, wherein the head of the fixing element is overall inclined, such as Fig.10 As shown in Figure B; CN217633328U discloses a flat head nail and a fixing device thereof, wherein the lower part of the nail head is inclined and the upper part is cylindrical. How to improve the performance of nails is still an important problem faced by the art. Utility Model Content

[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a new type of nail, nail gun, metal grille fixing system and electrical grounding system.

[0004] A nail comprises a screw rod and a nail head, wherein the nail head comprises a disc spring portion, an inverted truncated cone portion and a cylindrical portion from top to bottom; the heights of the disc spring portion, the inverted truncated cone portion and the cylindrical portion are H1, H2 and H3 respectively, and they have three side surfaces C1, C2 and C3 respectively; the minimum diameter of the disc spring portion is D1, the top surface diameter of the inverted truncated cone portion is D2, the bottom surface diameter is D3, and the diameter of the cylindrical portion is D4, wherein D1=D2, D3=D4, D2>D3, and the maximum diameter of the disc spring portion is smaller than the diameter of the screw rod; the nail is driven into a blind hole of a metal substrate by gunpowder, so that a first welding area Q1 is formed between the side surface C2 of the inverted truncated cone portion and the inner wall of the blind hole, a second welding area Q2 is formed between the side surface C3 of the cylindrical portion and the inner wall of the blind hole, and a third welding area Q3 is formed between the end face of the nail and the bottom of the blind hole.

[0005] Optionally, the screw and the nail head are integrally formed; the side surface C2 of the inverted frustum portion forms a virtual apex angle θ, and the apex angle θ is 2° to 10°; the ratio of the height H2 of the inverted frustum portion to the height H3 of the cylindrical portion is 2:1 to 1:2, preferably 1:1; the inverted frustum portion extends upward to the lower end surface of the screw, so that a disc spring portion is formed by the portion of the inverted frustum portion close to the screw portion; a disc spring is sleeved on the disc spring portion, and the disc spring is composed of a metal disc and a rubber gasket, and the rubber gasket is located below the metal disc; the outer edge of the metal disc is inclined downward by 1° to 5° relative to the horizontal plane.

[0006] A nail gun is used to install the nails, comprising a push rod, the push rod is located in a push rod guide cavity and can slide in the push rod guide cavity, an adjustable gunpowder driving mechanism is arranged at the upper part of the push rod guide cavity, and a nail guiding mechanism is arranged at the lower part of the push rod guide cavity, the nail guiding mechanism has a through cavity, which is connected with the guide cavity, so that the push rod can enter the cavity from the guide cavity, the screw portion of the nail is inserted into the nail guiding mechanism, the gunpowder in the gunpowder driving mechanism generates an impact force on the push rod when burning and exploding, and the push rod hits the nail at high speed, thereby driving the nail into the metal substrate.

[0007] A metal grille fixing system is provided, wherein the metal grille is fixed on the metal substrate by means of the nails described in the present invention.

[0008] An electrical grounding system realizes electrical grounding through the nails described in the present invention.

[0009] In general, the above technical scheme conceived by the present invention can achieve the following beneficial effects compared with the prior art: the nail head adopts a cylindrical shape that is easier to process at the bottom, and an inverted truncated cone shape at the top, forming a structure with an upper part tilted, which increases the welding area of ​​the nail and greatly improves the pull-out force of the nail; at the same time, the installation of the nail can be completed with a smaller gunpowder force value, which is beneficial to improving the service life of the nail gun. This upper part tilted structure has good mechanical processing characteristics while obtaining good pull-out force, is convenient for CNC processing, and has relatively good processing efficiency and yield rate. The present invention has good CNC processing characteristics while obtaining excellent pull-out force. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of the nail in the first embodiment of the present invention;

[0011] Figure 2A This is a first partial enlarged view of the nail head in the first embodiment of the present invention;

[0012] Figure 2BThis is a second partial enlarged view of the nail head in the first embodiment of the present invention;

[0013] Figure 2C This is a third partial enlarged view of the nail head in the first embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram of the structure of the nail in the second embodiment of the present invention;

[0015] Figure 4A This is a three-dimensional diagram of nail shooting in the third embodiment of the present invention;

[0016] Figure 4B This is a front view of the nail in the third embodiment of the present invention;

[0017] Figure 5 This is a schematic diagram of the installation process of the nail in the fourth embodiment of the present invention;

[0018] Figure 6 This is the installation effect diagram of the new type of nail;

[0019] Figure 7 This is the principle diagram of the new nail shooting method;

[0020] Figure 8 This is a schematic diagram of Embodiment 5 of the present invention;

[0021] Fig. 9 This is a schematic diagram of Embodiment 6 of the present invention;

[0022] Fig.10 It is a schematic diagram of the structure of nail shooting in the prior art. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings, so that the above-mentioned and other purposes, features and advantages of the present invention will be clearer. The same reference numerals in all the drawings indicate the same parts. The drawings are not deliberately drawn to scale, and the focus is on illustrating the main purpose of the present invention.

[0024] Example 1

[0025] See also Figure 1 The new type of nail is a flat head nail, including a screw 1 and a nail head. The screw 1 can be a screw of M6, M8, M10 or other models, and the length is usually 13-15mm. The length of the nail head is usually 6-8mm. The nail is made of metal, for example, preferably stainless steel. The screw 1 and the nail head are integrally formed, which not only improves the strength of the nail, but also facilitates the turning process of the nail, which is conducive to reducing costs. The diameter of the nail head is smaller than the diameter of the screw 1.

[0026] The nail head comprises a disc spring portion 2, a frustum portion 3 and a cylindrical portion 4 from top to bottom. In addition, a chamfer 5 can be formed at the end of the cylindrical portion 4, and the chamfer is preferably a 45-degree chamfer.

[0027] See also Figure 2A , Figure 2B , Figure 2C , the heights of the disc spring portion 2, the inverted truncated cone portion 3 and the cylindrical portion 4 are H1, H2, and H3 respectively, and they have three side surfaces C1, C2, and C3 respectively. In this embodiment, the disc spring portion 2 is cylindrical, and its minimum diameter is D1, the top diameter of the inverted truncated cone portion 3 is D2, the bottom diameter is D3, the diameter of the cylindrical portion 4 is D4, a first interface S1 is defined between the inverted truncated cone portion 3 and the disc spring portion 2, and a second interface S2 is defined between the inverted truncated cone portion 3 and the cylindrical portion 4, wherein D1=D2, D3=D4, D2>D3, and the maximum diameter of the disc spring portion 2 is smaller than the diameter of the screw 1 (in this embodiment, the maximum diameter of the disc spring portion 2 is equal to the minimum diameter).

[0028] The screw rod 1 and the nail head have the same central axis Z, and the side surface C2 of the frustum portion 3 forms a virtual vertex angle θ, which can be 2° to 10°. Within this range, it is beneficial for the nail to quickly enter the hole, thereby improving the welding effect and pulling force.

[0029] The height of the disc spring part 2 is H1, which is usually about 1-2.0 mm. The ratio of the height H2 of the inverted truncated cone part 3 to the height H3 of the cylindrical part 4 is 2:1 to 1:2, and is more preferably 1:1. For example, H2 is 2.5 mm and H3 is 2.5 mm. If the proportion of the truncated cone part 3 is too large, the processing efficiency and yield rate will be reduced, and the gunpowder force of the nail gun during installation will be increased. If the proportion of the truncated cone part 3 is too small, the welding area of ​​the nail head will be reduced, resulting in the inability to weld the nail head as a whole, thereby reducing the pulling force of the nail.

[0030] Example 2

[0031] like Figure 3 As shown, the inverted truncated cone portion 3 extends upward to the lower end surface S4 of the screw rod 1, that is, the portion of the inverted truncated cone portion 3 close to the screw rod portion 1 serves as the disc spring portion 2. Since the height H1 of the disc spring portion 2 is usually small, a portion of the inverted truncated cone portion 3 is used as the disc spring portion 2, which is convenient for turning processing during the nail manufacturing process. At the same time, relative to Example 1, the disc spring portion 2 formed in Example 2 is also in an inverted truncated cone shape as a whole, and its maximum diameter is larger than its minimum diameter, and its maximum diameter is slightly larger than the aperture of the disc spring portion 2. In this way, an interference fit is formed between the disc spring portion 2 and the nail head, and the installation of the disc spring is also more secure.

[0032] Example 3

[0033] Figure 4A and Figure 4BA nail with a disc spring 6 is shown. The disc spring 6 is sleeved on the disc spring part 2 of the nail head. The disc spring 6 consists of a metal disc 6.1 and a rubber gasket 6.2. The rubber gasket 6.2 is located below the metal disc 6.1. The outer edge of the metal disc 6.1 is slightly tilted downward, and the downward tilt angle relative to the horizontal plane is about 1° to 5°. After the nail is driven into the substrate, the disc spring 6 produces elastic deformation, thereby providing elastic support for the nail, making the installation of the nail more stable. When the tilt angle is less than 1 degree, the elastic deformation of the disc spring 6 is small. When the tilt angle exceeds 5 degrees, on the one hand, the strength of the disc spring 6 itself is reduced. On the other hand, if the angle is too large, the disc spring 6 will produce greater resistance to the nail during installation, which is not conducive to the installation of the nail.

[0034] Example 4

[0035] This embodiment focuses on the installation process of the new type of nail, and is also referred to in Figure 5 and Figure 6 The novel nail can be installed by a nail gun driven by gunpowder.

[0036] This type of nail gun usually includes a push rod 11, which is located in a push rod guide cavity 12 and can slide in the push rod guide cavity 12. A gunpowder driving mechanism 13 is provided at the upper part of the push rod guide cavity 12, and a nail guide mechanism 9 is provided at the lower part of the push rod guide cavity 12. The nail guide mechanism 9 has a through cavity 10, which is connected to the guide cavity 12, so that the push rod 11 can enter the cavity 10 from the guide cavity 12. The nail is temporarily installed in the nail guide mechanism 9, for example, by inserting the screw portion 1 of the nail into the nail guide mechanism 9 to complete the temporary installation of the nail. The gunpowder in the gunpowder driving mechanism 13 generates an impact force on the push rod 11 when it burns and explodes, and the push rod 11 will hit the nail at high speed, thereby launching the nail and driving it into the metal substrate 8.

[0037] During installation, a hole can be drilled on the metal substrate 8 first. The hole can be a through hole or a blind hole. From the perspective of facilitating welding fixation and improving the pull-out force, a blind hole is preferred. For example, a step drill can be used to pre-drill a blind hole 7 on the metal substrate 8. The diameter of the blind hole 7 is smaller than the diameter D4 of the cylindrical portion 4. The force of the push rod 11 can be adjusted by adjusting the gunpowder force value of the gunpowder driving mechanism 13. For this type of nail gun, the gunpowder force value is usually divided into 5 levels from small to large. The gunpowder force value of level 1 is the smallest, and the corresponding gunpowder force value of level 5 is the largest. If the gunpowder force value is too small, the nails may not be driven into the substrate at high speed, resulting in installation failure. If the gunpowder force value is too large, it will cause excessive recoil force on the nail gun, which will reduce the service life of the nail gun.

[0038] During the installation process, the nail head will generate high-speed friction with the inner wall of the blind hole 7, and will cause extrusion deformation on the metal of the inner wall of the blind hole, so that the nail head and the inner wall of the blind hole 7 are welded together. The depth of the blind hole 7 should be slightly greater than the length of the nail head. Preferably, the depth of the blind hole 7 is 1mm-3mm greater than the length of the nail head. When it is less than 1mm, the end face S3 of the nail will generate a very large compression force on the air in the blind hole, and this compression force will generate a corresponding reaction force on the nail, which is not conducive to the stability of the nail. On the other hand, when it is greater than 3mm, the melted metal during the installation and welding process will accumulate at the bottom of the blind hole 7. These accumulated metals cannot fully contact the end face S3 and the side face C3 of the nail, and even cannot contact the end face S3, thereby reducing the welding area between the nail head and the blind hole and reducing the pulling force of the nail.

[0039] The following is combined with Figure 7 The principle of the new type is further analyzed and explained. The nail head of the new type of nail is composed of a disc spring part 2, an inverted truncated cone part 3 and a cylindrical part 4. After installation, the disc spring part 2 is located outside the blind hole 7, while the inverted truncated cone part 3 and the cylindrical part 4 are located inside the blind hole 7, and they will be welded with the inner wall of the blind hole 7. Figure 7 shown.

[0040] During the installation process, in the first half, the cylindrical portion 4 will first cut and extrude the metal on the inner wall of the blind hole 7, and generate high-speed friction with the inner wall of the blind hole 7, so that a part of the molten metal will be squeezed between the side surface C3 of the cylindrical portion 4 and the inner wall of the blind hole 7 to form a second welding area Q2, and another part of the molten metal will form a third welding area Q3 between the end surface S3 and the bottom of the blind hole 7.

[0041] Since the diameter of the frustoconical portion 3 gradually increases upward and its diameter is greater than that of the cylindrical portion 4, in the second half of the nail installation, the frustoconical portion 3 will continue to produce friction and compression with the inner wall of the blind hole 7, and a first welding area Q1 will be formed between the side surface C2 of the frustoconical portion 3 and the inner wall of the blind hole 7.

[0042] In this way, during the entire installation process, three welding areas Q1, Q2 and Q3 will be generated at the nail head. Under the action of the three welding areas, almost all of the nail head is welded to the blind hole 7, which greatly increases the welding area of ​​the nail head and improves the pulling force of the nail.

[0043] The following is a comparison between the present invention's nail (number E, upper part tilted) and Fig.10 The three different types of nails, A (cylindrical), B (conical), and C (lower inclined), are compared and analyzed in terms of welding area, pull-out force, processing efficiency, yield rate, and powder force value. The nails used in the analysis are all stainless steel nails, with a lower end diameter of 5mm and a blind hole 7 diameter of 4.85mm.

[0044] Welding area, pull-out force and explosive force value

[0045] In the test, four blind holes were opened on the same metal substrate using a step drill, and four types of nails A, B, C, and E were driven into the same blind holes by a nail gun. The four types of nails driven into the substrate were subjected to a pull-out test using a puller to pull them out of the substrate. During this process, the gunpowder force value, gear, and pull-out force of the nail gun were recorded, and the welding area of ​​the nail head of the pulled-out nail was observed. In order to facilitate the recording of the welding area, in the test, the welding area between the lower end face of the nail head and the bottom face of the blind hole is called the third welding area Q3, the welding area between the side face of the lower section of the nail head and the side wall of the blind hole is called the second welding area Q2, and the welding area between the side face of the upper section of the nail head and the side wall of the blind hole is called the first welding area Q1. The test results are shown in Table 1.

[0046] Table 1

[0047] project Welding area Pull-out force(KN) Gunpowder gear A(cylindrical) Partial welding (Q2, Q3) 20.1 2 B (conical) Overall welding (Q1, Q2, Q3) 25.6 3 C (lower tilt) Partial welding (Q2, Q3) 22.0 2 E (upper tilt) Overall welding (Q1, Q2, Q3) 25.5 2

[0048] It can be seen from Table 1 that the new type of nail (Type E) produces an integral weld, and the pull-out force is basically the same as that of the tapered (Type B) nail, but the required powder force value is equivalent to that of Type A and Type C, which is less than that of Type B. Since Type B and Type E are both integrally welded, the pull-out force is similar, but since the diameter of the tapered nail of Type B gradually increases from the end face, the required powder driving force value is larger; Type A and Type C only produce welding between the end face and the lower section of the nail, and the upper section of the nail is not welded. The reason is that the lower sections of these two nails have expanded the diameter of the blind hole during the process of driving into the blind hole, and the expanded diameter of the blind hole is greater than or equal to the diameter of the upper section of the nail, resulting in the upper section of the nail failing to produce effective friction welding with the inner wall of the blind hole, thereby reducing the pull-out force of the nail.

[0049] Processing efficiency and yield rate

[0050] In the test, the same CNC (numerical control lathe) was used to process four types of nails, A, B, C, and E, respectively. 100 nails of each type were processed, and the time required to process 100 nails and the number of qualified products (yield rate) were recorded. The test results are shown in Table 2.

[0051] Table 2

[0052] project Processing time Yield A(cylindrical) 25min / 100 99.99％ B (conical) 32min / 100 95.93％ C (lower tilt) 30min / 100 97.56％ E (upper tilt) 29min / 100 98.86％

[0053] From Table 2 above, it can be seen that the cylindrical nail type A has the shortest processing time (25 minutes) and the highest yield rate due to its simple structure. The conical nail type B has the most complex structure and needs to continuously adjust the position of the turning tool during processing. It is difficult to process and takes the longest processing time (32 minutes) and has the lowest yield rate. The processing time and yield rate of types C and E are between those of types A and B. However, it is worth noting that the overall value of type E is slightly better than that of type C. The possible reason is that during the turning process of the nail, the fixture is clamped. For the C type that holds the screw rod 1, the first part to be processed is the inclined section, which is relatively farther away from the fixture. Since the tool needs to be adjusted continuously at the inclined section, the nail head and the tool are more likely to vibrate in this section, resulting in reduced processing accuracy. The lower part of the E type is cylindrical, which is easier to process and the tool moves more smoothly. When the tool moves to the upper inclined section, since the upper inclined section is closer to the fixture, there will be no shaking during the processing of the upper inclined section. In this way, overall, the processing of the E type is smoother and more accurate than that of the C type.

[0054] Example 5

[0055] This embodiment focuses on an application of the novel nailing method. Figure 8 As shown, the new type of nail can be used to fix the metal grille 16, and the metal grille 16 can be laid on the substrate 8, and the substrate can be a steel beam to form, for example, an offshore work platform. Pre-drill the blind hole 7 on the steel beam, and use a nail gun to drive the new type of nail into the blind hole 7, so that the nail is firmly fixed on the steel beam, and then the metal grille 16 is laid. After the metal grille 16 is laid, the disc 15 with the tail handle 14 is tightened with the screw 1 of the nail, so that the metal grille 16 is fixed by the nail and the disc together.

[0056] Example 6

[0057] This embodiment focuses on another application of the new nail, such as Fig. 9 As shown, the new type of nail can be used to achieve electrical grounding. For a metal pipe 17 that needs electrical grounding, such as a natural gas / oil pipe, a blind hole can be pre-drilled on the pipe, and the new type of nail can be driven into the blind hole by a nail gun, and then one end of the grounding wire 18 is tightened with the screw 1 through a nut. A grounding metal rod 19 can be set on the side of the pipe 17, and the nail is driven into the metal rod 19 in the same way, and the other end of the grounding wire 18 is tightened with the screw 1 on the metal rod 19 through a nut, thereby achieving electrical grounding.

[0058] In addition to the applications described in the above embodiments, the nails described in the present invention can also realize the multi-purpose connection and fixation of various items such as instruments, meters, control switches, small equipment, multi-purpose brackets, cable trays, etc.

[0059] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the present technical solution using the methods and technical contents disclosed above without departing from the scope of the present technical solution, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the present technical solution still falls within the scope of protection of the present technical solution.

Claims

1. A nailing device, characterized in that: It includes a screw rod and a nail head, wherein the nail head is composed of a disc spring portion, an inverted truncated cone portion and a cylindrical portion from top to bottom; the heights of the disc spring portion, the inverted truncated cone portion and the cylindrical portion are H1, H2 and H3 respectively, and they have three side surfaces C1, C2 and C3 respectively; the minimum diameter of the disc spring portion is D1, the top surface diameter of the inverted truncated cone portion is D2, the bottom surface diameter is D3, and the diameter of the cylindrical portion is D4, wherein D1=D2, D3=D4, D2>D3, and the maximum diameter of the disc spring portion is smaller than the diameter of the screw rod; the nail is driven into a blind hole of a metal substrate by gunpowder, so that a first welding area Q1 is formed between the side surface C2 of the inverted truncated cone portion and the inner wall of the blind hole, a second welding area Q2 is formed between the side surface C3 of the cylindrical portion and the inner wall of the blind hole, and a third welding area Q3 is formed between the end face of the nail and the bottom of the blind hole.

2. The nail according to claim 1, characterized in that: The screw rod and the nail head are integrally formed.

3. The nail according to claim 1, characterized in that: The side surface C2 of the inverted truncated cone portion forms a virtual vertex angle θ, and the vertex angle θ is 2° to 10°.

4. The nail according to claim 1, characterized in that: The ratio of the height H2 of the inverted truncated cone portion to the height H3 of the cylindrical portion is 2:1 to 1:

2.

5. The nail according to claim 1, characterized in that: The ratio of the height H2 of the inverted truncated cone portion to the height H3 of the cylindrical portion is 1:

1.

6. The nail according to claim 1, characterized in that: The inverted truncated cone portion extends upward to the lower end surface of the screw rod, so that a disc spring portion is formed by a portion of the inverted truncated cone portion close to the screw rod portion.

7. The nail according to claim 1, characterized in that: The disc spring part is sleeved with a disc spring, and the disc spring is composed of a metal disc and a rubber gasket, and the rubber gasket is located below the metal disc.

8. The nail according to claim 7, characterized in that: The outer edge of the metal disc is inclined downward by 1° to 5° relative to the horizontal plane.

9. A nail gun for installing the nails according to any one of claims 1 to 8, characterized in that: The invention comprises a push rod, which is located in a push rod guide cavity and can slide in the push rod guide cavity. An adjustable gunpowder driving mechanism is arranged at the upper part of the push rod guide cavity. A nail guiding mechanism is arranged at the lower part of the push rod guide cavity. The nail guiding mechanism has a through cavity, which is connected with the guiding cavity, so that the push rod can enter the cavity from the guiding cavity. The screw part of the nail is inserted into the nail guiding mechanism. The gunpowder in the gunpowder driving mechanism generates an impact force on the push rod when burning and exploding. The push rod hits the nail at a high speed, thereby driving the nail into the metal substrate.

10. A metal grille fixing system, characterized in that: The metal grid is fixed to the metal substrate by means of the nails described in any one of claims 1 to 8.

11. An electrical grounding system, characterized in that: Electrical grounding is achieved by the nail according to any one of claims 1 to 8.

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