A pneumatic nailer bumper pad structure

Abstract

The utility model belongs to the technical field of buffer pad, specifically disclose a kind of pneumatic nailing gun buffer pad structure, including buffer pad body, the central hole is established in the top central of buffer pad body, the inner diameter of central hole gradually decreases from top to bottom, the inside lower end of central hole is also equipped with annular boss;The upper portion of buffer pad body is circular table shape structure, the lower portion of buffer pad body is cylindrical structure, the junction of the upper portion of buffer pad body and the lower portion of buffer pad body is equipped with third chamfer.The utility model provides a kind of pneumatic nailing gun buffer pad structure, is provided with central hole and heat dissipation hole, and the inner diameter of central hole gradually decreases from top to bottom, and the inner diameter of heat dissipation hole gradually increases from top to bottom, which jointly constructs optimized internal stress transmission network, so that impact energy is more evenly dispersed in the entire buffer pad body, substantially slows down the speed of material fatigue damage, prolongs its service life, significantly reduces replacement frequency and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of cushioning pad technology, and in particular to a cushioning pad structure for a pneumatic nail gun. Background Technology

[0002] Pneumatic nail guns, handheld tools powered by high-pressure gas, are widely used in home improvement, construction, and carpentry due to their high efficiency and convenience. Common types include pneumatic staple guns and coil nail guns. In these tools, a cushioning pad is one of the key components ensuring stable operation and user comfort.

[0003] This component is typically installed in a specific location within the cylinder chamber. Its core function is to directly withstand and absorb the intense impact force and residual energy generated when the firing pin piston strikes the nail at high speed. By effectively attenuating the impact, the buffer not only significantly reduces tool operating noise but also reduces vibration transmitted to the nail gun body and the operator's arm, thereby improving operating comfort and protecting the internal structure of the nail gun from damage. Given that its working environment requires repeated exposure to high-frequency, high-intensity mechanical impact loads, the performance and lifespan of the buffer directly affect the overall operating cost and reliability of the tool.

[0004] Currently, most pneumatic nail gun shock pads on the market are made of rubber materials (such as natural rubber (NR) or hydrogenated nitrile butadiene rubber (HNBR)), relying primarily on the inherent elasticity and damping properties of these materials to achieve energy absorption. However, existing shock pad technologies have the following significant drawbacks: The structure of existing shock pads is mostly a simple solid body or a single cylindrical hole. This traditional solid or simply perforated structure, when subjected to impact, results in uneven internal stress distribution, easily forming high stress concentration points in specific areas (such as the center or edge fixing points), accelerating material fatigue and failure. Specifically, under continuous strong impact loads, rubber shock pads are prone to compressive fatigue, permanent deformation (increased compressive permanent deformation), microcrack initiation and propagation, and even eventual tearing failure. This directly leads to a short service life for the shock pads, requiring frequent downtime for replacement, increasing maintenance costs and time, and affecting work efficiency.

[0005] In summary, the existing pneumatic nail gun buffer pads suffer from insufficient durability due to uneven internal stress distribution when subjected to impact. Utility Model Content

[0006] This invention provides a pneumatic nail gun buffer pad structure, which can solve the problem of insufficient durability caused by uneven internal stress distribution when the pneumatic nail gun buffer pad is subjected to impact in the prior art.

[0007] A pneumatic nail gun buffer pad structure includes a buffer pad body, a central hole is provided at the top center of the buffer pad body, the inner diameter of the central hole gradually decreases from top to bottom, and an annular boss is provided at the lower end of the interior of the central hole.

[0008] The upper part of the buffer pad body is a frustum-shaped structure, the lower part of the buffer pad body is a cylindrical structure, and a third chamfer is provided at the connection between the upper part and the lower part of the buffer pad body.

[0009] The top of the cushioning pad body has heat dissipation holes evenly distributed along the circumferential direction, and the inner diameter of the heat dissipation holes gradually increases from top to bottom. The bottom of the cushioning pad body has an annular groove that communicates with the heat dissipation holes.

[0010] Furthermore, a stepped hole is provided at the lower end of the interior of the central hole;

[0011] The annular boss is located above the stepped hole.

[0012] Furthermore, the upper edge of the central hole is provided with a first chamfer.

[0013] Furthermore, the lower edge of the stepped hole is provided with a second chamfer.

[0014] Furthermore, the number of heat dissipation holes is 6-12.

[0015] Furthermore, the upper edge of the heat dissipation hole is provided with a fourth chamfer.

[0016] Furthermore, several heat dissipation grooves are provided at the lower end of the outer surface of the buffer pad body.

[0017] Furthermore, the number of heat dissipation slots is 6-12.

[0018] Furthermore, the third chamfer is provided with several positioning blocks.

[0019] Furthermore, the bottom edge of the buffer pad body is provided with a fifth chamfer.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This utility model provides a pneumatic nail gun buffer pad structure, which is provided with a central hole and heat dissipation holes. The inner diameter of the central hole gradually decreases from top to bottom, while the inner diameter of the heat dissipation holes gradually increases from top to bottom. Its advantages are as follows: First, the central hole adopts a structure design that is wider at the top and narrower at the bottom, which can actively guide and redistribute the vertical impact force from the piston. When the impact load acts on the top of the buffer pad, the inclined surface of the central hole converts part of the vertical stress into tangential stress that diffuses along the hole wall, effectively avoiding excessive stress concentration in the central area of ​​the buffer pad and significantly reducing the risk of compressive fatigue, cracking, or tearing in the central part. Second, the top-narrow, bottom-wide structure design of the heat dissipation holes, while achieving heat dissipation, allows the sidewall inclination angle design to smoothly guide the transmission of impact force in the edge area of ​​the buffer pad, avoiding micro-cracks caused by stress abrupt changes at the edge fixing points. Finally, the special geometry of the central hole and the heat dissipation holes together construct an optimized internal stress transmission network, making the impact energy more evenly distributed throughout the entire buffer pad body, significantly slowing down the material fatigue damage rate, extending its service life, and significantly reducing replacement frequency and maintenance costs.

[0022] 2. In this utility model, the inner diameter of the heat dissipation holes gradually increases from top to bottom. Its structure design, which is narrow at the top and wide at the bottom, promotes the air circulation in the buffer pad, accelerates the discharge of frictional heat generated during the impact, effectively achieves heat dissipation, reduces the heat accumulation effect, and avoids the problems of increased hardness, decreased elasticity, and accelerated oxidation aging of the buffer pad material due to long-term high-temperature working environment. This further ensures the long-term elasticity and buffering performance stability of the buffer pad and indirectly improves its durability.

[0023] 3. In this utility model, the pneumatic nail gun buffer pad structure, based on the setting of the central hole and heat dissipation holes, as well as the structural design of the buffer pad body, achieves a fundamental improvement in stress distribution and reduces reliance on ultra-high-cost rubber (such as HNBR). Even when using conventional rubber (such as NR or low-cost synthetic rubber), it can achieve or even surpass the lifespan of traditional HNBR buffer pads through its structural advantages. That is, it significantly reduces raw material costs while ensuring high durability.

[0024] 4. In this utility model, the optimized pneumatic nail gun buffer pad structure does not sacrifice the inherent elasticity and damping characteristics of the rubber material in its stress distribution. Its impact absorption efficiency and vibration attenuation capability are comparable to those of traditional solid buffer pads, ensuring that the operating comfort and equipment protection performance are not affected. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0026] Figure 1 A schematic diagram of a pneumatic nail gun buffer pad structure provided by this utility model;

[0027] Figure 2 A schematic diagram of a pneumatic nail gun buffer pad structure provided by this utility model;

[0028] Figure 3 A schematic diagram of a pneumatic nail gun buffer pad structure provided by this utility model;

[0029] Figure 4 A schematic diagram of a pneumatic nail gun buffer pad structure provided by this utility model;

[0030] Figure 5 A structural cross-sectional view of a pneumatic nail gun buffer pad structure provided by this utility model;

[0031] Figure 6 Provided by this utility model Figure 5 Enlarged view of the structure at point B in the image;

[0032] Figure 7 Provided by this utility model Figure 5 Enlarged view of the structure at point C in the image;

[0033] Figure 8 Provided by this utility model Figure 5 Enlarged view of the structure at point D in the image.

[0034] Explanation of reference numerals in the attached drawings: 1. Buffer pad body; 2. Center hole; 3. Annular boss; 4. Step hole; 5. Third chamfer; 6. Heat dissipation hole; 7. Annular groove; 11. Heat dissipation groove; 12. Fifth chamfer; 21. First chamfer; 41. Second chamfer; 51. Positioning block; 61. Fourth chamfer. Detailed Implementation

[0035] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0036] like Figures 1 to 8 As shown, the present invention provides a pneumatic nail gun buffer pad structure, including a buffer pad body 1, a central hole 2 is provided at the top center of the buffer pad body 1, the inner diameter of the central hole 2 gradually decreases from top to bottom, and an annular boss 3 is also provided at the lower end of the interior of the central hole 2.

[0037] The upper part of the buffer pad body 1 is a frustum-shaped structure, the lower part of the buffer pad body 1 is a cylindrical structure, and a third chamfer 5 is provided at the connection between the upper part and the lower part of the buffer pad body 1.

[0038] The top of the cushioning pad body 1 has heat dissipation holes 6 evenly distributed along the circumferential direction. The inner diameter of the heat dissipation holes 6 gradually increases from top to bottom. The bottom of the cushioning pad body 1 has an annular groove 7 that communicates with the heat dissipation holes 6.

[0039] The upper part of the buffer pad body 1 is a frustum-shaped structure, and the lower part is a cylindrical structure. A third chamfer 5 is provided at the connection between the upper and lower parts of the buffer pad body 1. This third chamfer 5 is arc-shaped, meaning that the upper and lower parts of the buffer pad body 1 are smoothly connected by the third chamfer 5 with an arc-shaped chamfer. Specifically, when the frustum-shaped structure of the upper part of the buffer pad body 1 is impacted, due to its tapered shape (smaller at the top and larger at the bottom), the initial stiffness at the contact point is low, making it prone to elastic deformation and quickly absorbing the initial impact. The impact energy is absorbed to provide a "soft landing" feel. As compression and deformation deepen, the cross-sectional area of ​​the frustum increases, and the stiffness also increases progressively. A smooth transition is achieved through the third chamfer 5 at the connection between the upper and lower parts. The lower cylindrical structure provides final support and higher stiffness, ensuring that excessive compression or bottom penetration will not occur under large impacts, and effectively transferring the remaining controllable load. This segmented response characteristic achieves a smoother and more efficient impact energy absorption curve, significantly improving the buffering performance, and is especially suitable for application scenarios that require both initial impact attenuation and final support.

[0040] In addition, the design of the third chamfer 5 eliminates stress concentration points. During compression deformation, the force flow can be smoothly and continuously transferred from the frustum part to the cylindrical part, avoiding the generation of high stress peaks at the connection. This reduces the risk of fatigue failure of the material under repeated impact loads, significantly extends the service life of the buffer pad, and improves reliability.

[0041] This cushioning pad design, through the organic combination of an upper frustum (gradual energy absorption), a lower cylinder (stable support), and key curved chamfers (eliminating stress concentration and smoothing force flow transmission), comprehensively improves the product's cushioning performance, structural durability, anti-eccentric load stability, installation convenience, and material utilization efficiency. It is especially suitable for cushioning applications requiring high reliability, long life, and complex load conditions.

[0042] In addition, a central hole 2 is provided at the top center of the buffer pad body 1. The inner diameter of the central hole 2 gradually decreases from top to bottom. Specifically, the vertical cross-section of the central hole 2 is an inverted trapezoid. Heat dissipation holes 6 are evenly distributed along the circumferential direction at the top of the buffer pad body 1. The inner diameter of the heat dissipation holes 6 gradually increases from top to bottom. Specifically, the vertical cross-section of the heat dissipation holes 6 is a trapezoid.

[0043] First, the central hole 2 adopts a top-wide, bottom-narrow structure design, which can actively guide and redistribute the vertical impact force from the piston. When the impact load acts on the top of the buffer pad, the inclined surface of the central hole 2 converts part of the vertical stress into tangential stress that diffuses along the hole wall, effectively avoiding excessive stress concentration in the central area of ​​the buffer pad and significantly reducing the risk of compressive fatigue, cracking, or tearing in the central part. Second, the top-narrow, bottom-wide structure design of the heat dissipation hole 6, while achieving heat dissipation, also allows the sidewall inclination angle design to smoothly guide the transmission of impact force in the edge area of ​​the buffer pad, avoiding micro-cracks caused by stress abrupt changes at the edge fixing point. Finally, the special geometry of the central hole 2 and the heat dissipation hole 6 together construct an optimized internal stress transmission network, making the impact energy more evenly distributed throughout the entire buffer pad body 1, greatly slowing down the material fatigue damage rate, extending its service life, and significantly reducing replacement frequency and maintenance costs.

[0044] In addition, an annular boss 3 is provided at the lower end of the center hole 2. The annular boss 3 can improve the shrinkage cracking of the mold parting line and ensure that the product is free of vulcanization defects.

[0045] The bottom of the buffer pad body 1 has an annular groove 7 that communicates with the heat dissipation holes 6. The design of the annular groove 7 reduces the initial contact area between the buffer pad and the mounting surface. Under the same impact load, the local pressure in the contact area increases significantly, making the raised structures around the annular groove 7 (formed by the groove) more prone to compression deformation and inward bending / contraction. This deformation mode makes fuller use of the material's elasticity or viscoelasticity, effectively absorbing and dissipating impact energy, thereby improving the overall buffering effect and energy absorption efficiency. In addition, the annular groove provides a preset deformation guiding area and stress release area, which helps reduce the risk of local fatigue failure of the material and extends the life of the pad. Furthermore, the initial contact area between the buffer pad and the mounting surface is small, and this small contact area forms discrete annular raised contact bands. At the same time, the groove itself provides space to accommodate small undulations, thereby ensuring a more stable and reliable support and buffering effect. Finally, the design of the annular groove removes some material from non-core pressure-bearing areas while ensuring the strength of the core functional area (raised contact band), which can reduce material usage and manufacturing costs to a certain extent.

[0046] like Figures 1 to 8 As shown, in some embodiments of this utility model, a stepped hole 4 is provided at the lower end of the center hole 2; an annular boss 3 is provided above the stepped hole 4.

[0047] A stepped hole 4 is provided at the lower end of the central hole 2, and an annular boss 3 is provided above the stepped hole 4, that is, the annular boss 3 is provided at the bottom of the buffer pad body 1. The stepped hole 4 forms a progressive cross-section transition zone. When the impact force is transmitted downward along the hole wall of the central hole 2, the inner wall of the stepped structure of the stepped hole 4 will decompose and diffuse the impact energy step by step, completely eliminating the right-angle stress concentration point at the bottom of the traditional straight hole. In addition, the stepped hole 4 increases the effective bearing area of ​​the material at the bottom of the hole, allowing more rubber material to participate in the plastic deformation energy absorption process, further improving the overall impact fatigue life. The stepped hole structure guides the impact force to be transmitted radially to the outer periphery of the buffer pad, avoiding stress accumulation at the bottom edge of the hole (the original high-incidence area of ​​cracking), and reducing the initiation of edge cracks.

[0048] like Figures 1 to 8 As shown, in some embodiments of this utility model, the upper edge of the central hole 2 is provided with a first chamfer 21;

[0049] Traditional right-angled center holes have sharp right angles (90° intersection) at their upper edges, which can create localized stress peaks under piston impact, becoming preferential initiation points for fatigue cracks. The first chamfer 21 can be a radius of 2.0mm, completely eliminating this geometric abrupt change, allowing for a smooth transition of stress flow and reducing peak stress. Furthermore, the first chamfer 21 significantly delays the initiation time of microcracks in the material by eliminating stress concentration sources at the top edge. Combined with the stress dispersion capability of the inverted trapezoidal hole 2 itself, this further extends the service life of the buffer pad.

[0050] like Figures 1 to 8 As shown, in some embodiments of this utility model, the lower edge of the stepped hole 4 is provided with a second chamfer 41; specifically, the second chamfer 41 can be a radius of R0.5-R2.0mm.

[0051] The second chamfer 41 is provided, which transforms the right angle into a smooth transition surface at the end of the impact energy transmission, completely eliminating the stress concentration caused by the geometric change, allowing the stress flow lines to radiate naturally to the buffer pad matrix and reducing the peak stress; in addition, the second chamfer 41 can also destroy the crack propagation path and improve the crack resistance of the bottom of the buffer pad.

[0052] like Figures 1 to 8 As shown, in some embodiments of this utility model, the number of heat dissipation holes 6 is 6-12; through flow field simulation and structural topology optimization, it is confirmed that this interval can maximize heat dissipation efficiency while maintaining the integrity of the top structure, thus achieving a balance between heat dissipation and strength.

[0053] like Figures 1 to 8As shown, in some embodiments of this utility model, the upper edge of the heat dissipation hole 6 is provided with a fourth chamfer 61; the upper edge of the heat dissipation hole 6 is provided with a fourth chamfer 61, which can be a radius of R0.5-R2.0mm. Combined with the design of the first chamfer 21 on the center hole 2, a comprehensive protection system is achieved, stress concentration risk points are eliminated, and the service life of the buffer pad is effectively extended.

[0054] like Figures 1 to 8 As shown, in some embodiments of this utility model, a plurality of heat dissipation grooves 11 are provided at the lower end of the outer side of the buffer pad body 1; the heat dissipation grooves 11 enable the buffer pad body 1 to form an axial airflow channel during installation, which specifically cools the bottom area that is most prone to heat accumulation; in addition, the design of the heat dissipation grooves 11 makes the clamping force of the pneumatic nail gun on the buffer pad change from a surface load to a discrete point load during actual use, resulting in a more uniform pressure distribution.

[0055] like Figures 1 to 8 As shown, in some embodiments of this utility model, the number of heat dissipation grooves 11 is 6-12.

[0056] like Figures 1 to 8 As shown, in some embodiments of this utility model, a plurality of positioning blocks 51 are provided on the third chamfer 5; the plurality of positioning blocks 51 are provided on the third chamfer 5 for the assembly and use of the buffer pad.

[0057] like Figures 1 to 8 As shown, in some embodiments of this utility model, the bottom edge of the buffer pad body 1 is provided with a fifth chamfer 12; the fifth chamfer 12 can be a radius of R0.5-R2.0mm; the setting of the fifth chamfer 12 can eliminate edge stress concentration and micro-cracks, and improve assembly reliability and efficiency.

[0058] This utility model provides a pneumatic nail gun buffer pad structure, which is provided with a central hole 2 and a heat dissipation hole 6. The inner diameter of the central hole 2 gradually decreases from top to bottom, while the inner diameter of the heat dissipation hole 6 gradually increases from top to bottom. Together, they form an optimized internal stress transmission network, which makes the impact energy more evenly distributed throughout the buffer pad body, significantly slows down the material fatigue damage rate, extends its service life, and significantly reduces the replacement frequency and maintenance cost.

[0059] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A pneumatic nail gun buffer pad structure, characterized in that, Includes a buffer pad body (1), the buffer pad body (1) has a central hole (2) at the top center, the inner diameter of the central hole (2) gradually decreases from top to bottom, and the lower end of the central hole (2) is also provided with an annular boss (3). The upper part of the buffer pad body (1) is a frustum-shaped structure, the lower part of the buffer pad body (1) is a cylindrical structure, and a third chamfer (5) is provided at the connection between the upper part of the buffer pad body (1) and the lower part of the buffer pad body (1). The top of the buffer pad body (1) is evenly distributed with heat dissipation holes (6) along the circumferential direction. The inner diameter of the heat dissipation holes (6) gradually increases from top to bottom. The bottom of the buffer pad body (1) is provided with an annular groove (7) that communicates with the heat dissipation holes (6).

2. The pneumatic nail gun buffer pad structure according to claim 1, characterized in that, A stepped hole (4) is provided at the lower end of the interior of the central hole (2); The annular boss (3) is located above the stepped hole (4).

3. The pneumatic nail gun buffer pad structure according to claim 1, characterized in that, The upper edge of the central hole (2) is provided with a first chamfer (21).

4. The pneumatic nail gun buffer pad structure according to claim 1, characterized in that, The lower edge of the stepped hole (4) is provided with a second chamfer (41).

5. The pneumatic nail gun buffer pad structure according to claim 1, characterized in that, The number of heat dissipation holes (6) is 6-12.

6. The pneumatic nail gun buffer pad structure according to claim 1, characterized in that, The upper edge of the heat dissipation hole (6) is provided with a fourth chamfer (61).

7. The pneumatic nail gun buffer pad structure according to claim 1, characterized in that, The lower end of the outer side of the buffer pad body (1) is provided with several heat dissipation grooves (11).

8. The pneumatic nail gun buffer pad structure according to claim 7, characterized in that, The number of heat dissipation slots (11) is 6-12.

9. The pneumatic nail gun buffer pad structure according to claim 1, characterized in that, The third chamfer (5) is provided with several positioning blocks (51).

10. The pneumatic nail gun buffer pad structure according to claim 1, characterized in that, The bottom edge of the buffer pad body (1) is provided with a fifth chamfer (12).

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