A cylinder rear cover mounting unit, a force supply device, and a nail gun

Abstract

The utility model discloses a kind of cylinder rear cover mounting unit, power supply device and nail gun, cylinder rear cover mounting unit including outer cylinder, rear cover and guard frame, one end of outer cylinder is equipped with opening, rear cover is equipped at the opening of outer cylinder, and rear cover is sealed to opening, guard frame is fixedly connected with the one end of outer cylinder setting opening, rear cover is located at the direction one side of guard frame towards outer cylinder, guard frame is at least combined with part rear cover and is limited to be used for preventing rear cover towards guard frame direction movement, rear cover is connected with outer cylinder using guard frame, to provide structural basis for the simple processing of rear cover structure, the processing of rear cover can be facilitated, and then internal defect can be significantly reduced, on the structural basis that guard frame provides support fixed for rear cover, rear cover no longer needs particularly big strength, and then allow rear cover to reduce thin design, while guarantee structural strength and pressure resistance, reduce material cost, reduce dead weight, reduce volume, improve product light weight and energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of nail gun technology, and in particular to a cylinder rear cover mounting unit, a power supply device, and a nail gun. Background Technology

[0002] Currently, the power supply structure shell of nail guns mainly consists of a main body and a rear cover, both typically manufactured using the same casting process. This design leverages the convenience of traditional manufacturing processes, utilizing casting technology to achieve low-cost mass production of complex shapes. However, existing technology suffers from the following significant drawbacks:

[0003] The back cover must withstand the instantaneous impact of high-pressure gas during firing. However, the casting process is prone to internal defects such as porosity, shrinkage cavities, and cracks. These defects can expand into leakage channels under high-pressure cyclic loading, leading to failure of the power supply structure. To compensate for these structural defects, the back cover is typically thickened to provide safety redundancy. Although the porosity can be reduced to a very low level with advanced casting equipment, the latent nature of porosity means that even with improved casting processes, the back cover thickness cannot be reduced during production. This means the design thickness for safety redundancy must still be maintained, resulting in material waste, increased weight, larger size, and higher costs.

[0004] Furthermore, during the assembly of the power supply structure shell, the back cover needs to be joined with the main body. Correspondingly, there are requirements for the airtightness of the contact area between the back cover and the main body. However, the surface of the back cover processed by the casting process is relatively rough and cannot be used directly in scenarios with high airtightness requirements and high air pressure. The cast back cover needs to undergo secondary surface processing before it can be used, which leads to an increase in the number of processes, and consequently, an increase in time and production costs. Utility Model Content

[0005] To overcome at least one of the defects described in the prior art, this utility model provides a cylinder block rear cover mounting unit, a power supply device, and a nail gun. It solves the problems of material waste, heavy weight, large size, increased cost, and increased time and production costs due to the need for secondary processing associated with rear covers produced using casting processes.

[0006] The technical solution adopted by this utility model to solve its problem is:

[0007] A cylinder block rear cover mounting unit, comprising:

[0008] The outer cylinder body is cylindrical, and one end of the outer cylinder body has an opening;

[0009] The rear cover is integrally formed by profile stretching process. The rear cover is located at the opening of the outer cylinder and seals the opening.

[0010] Furthermore, it also includes a protective frame, which is fixedly connected to one end of the outer cylinder body where the opening is provided, and the rear cover is located on the side of the protective frame facing the outer cylinder body. The protective frame is at least partially fitted and limited by the rear cover to prevent the rear cover from moving towards the protective frame.

[0011] Furthermore, the back cover is provided with a first positioning structure, and the protective frame is provided with a second positioning structure corresponding to the first positioning structure. The back cover and the protective frame are positioned by the first positioning structure and the second positioning structure to prevent the back cover from rotating.

[0012] Furthermore, it also includes a support frame, which is disposed inside the outer cylinder and abuts against the rear cover to support the rear cover.

[0013] Furthermore, the support frame is provided with multiple support seats on the side facing the rear cover, and all of the support seats are in contact with the rear cover.

[0014] Furthermore, the inner wall of the outer cylinder body facing the opening is provided with a first stepped surface, and the support frame abuts against the first stepped surface.

[0015] Furthermore, an air nozzle is provided in the middle of the rear cover.

[0016] Furthermore, the back cover is made of aluminum.

[0017] Furthermore, a sealing element is provided between the rear cover and the outer cylinder body, and the rear cover is sealed to the outer cylinder body through the sealing element.

[0018] This utility model also provides a power supply device, including:

[0019] Inner cylinder block;

[0020] The aforementioned cylinder block rear cover mounting unit has the inner cylinder block located inside the outer cylinder block.

[0021] This utility model also provides a nail gun, including the aforementioned cylinder rear cover mounting unit.

[0022] In summary, the cylinder rear cover mounting unit, power supply device, and nail gun provided by this utility model have the following technical effects:

[0023] 1. The rear cover is connected to the outer cylinder body using a protective frame, providing a structural basis for simplified manufacturing of the rear cover. This simplified structure facilitates manufacturing and significantly reduces internal defects. Furthermore, with the protective frame providing structural support, the rear cover no longer requires exceptionally high strength, allowing for a thinner design while maintaining structural strength and pressure resistance. This reduces material costs, lightens weight, shrinks size, and improves product lightweighting and energy efficiency.

[0024] 2. The simple back cover structure eliminates the need for casting. Whether machined or die-cast, the back cover surface remains smooth, achieving high-precision sealing without additional processing. This reduces production steps, shortens assembly time, lowers production costs, and ensures reliable sealing under high-pressure conditions. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the outer cylinder body structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the support frame structure of this utility model;

[0029] Figure 5 This is a cross-sectional structural diagram of the present invention;

[0030] Figure 6 This utility model Figure 5 Enlarged view of part A;

[0031] Figure 7 This is an exploded structural diagram of the back cover, protective frame, and seal of Embodiment 2 of this utility model.

[0032] The meanings of the reference numerals in the attached drawings are as follows: 1. Outer cylinder body; 11. Opening; 12. First step surface; 2. Rear cover; 21. First positioning structure; 22. Annular groove; 23. Air nozzle; 3. Protective frame; 31. Second positioning structure; 4. Support frame; 41. Support base; 42. Vent hole; 43. Second step surface; 5. Seal; 6. Inner cylinder body; 7. Bolt. Detailed Implementation

[0033] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described and discussed below with reference to the accompanying drawings. Obviously, what is described here is only a part of the examples of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the protection scope of this invention.

[0034] To facilitate understanding of the embodiments of this utility model, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0037] See Figures 1-7 This utility model discloses a cylinder rear cover mounting unit, including an outer cylinder 1, a rear cover 2, and a protective frame 3. The outer cylinder 1 is cylindrical, and one end of the outer cylinder 1 is provided with an opening 11. The rear cover 2 is located at the opening 11 of the outer cylinder 1 and the rear cover 2 seals the opening 11. The protective frame 3 is fixedly connected to the end of the outer cylinder 1 where the opening 11 is located. The rear cover 2 is located on the side of the protective frame 3 facing the outer cylinder 1. The protective frame 3 is at least partially fitted and limited by the rear cover 2 to prevent the rear cover 2 from moving towards the protective frame 3.

[0038] For details, please refer to Figures 1-3As shown, the outer cylinder 1 is cylindrical, with an opening 11 at one end. The rear cover 2 is located at the opening 11 of the outer cylinder 1 and is sealed to the opening 11. The protective frame 3 can be a ring structure surrounding the opening 11 of the outer cylinder 1. The fixed connection method includes, but is not limited to, welding, bolt connection, or snap locking. The ring-shaped protective frame 3 and the outer cylinder 1 form a rigid support structure. When high-pressure gas impacts the rear cover 2, the tendency of the rear cover 2 to move outward is directly blocked by the continuous contact surface of the protective frame 3. The protective frame 3 can be a stamped iron part, which has high material strength, low production cost, and good durability, and can provide stable limiting for the rear cover 2. Furthermore, the structural strength advantage of using a stamped iron part for the protective frame 3 is also conducive to the lightweight and thin design of the protective frame 3.

[0039] Through the above solution, the rear cover 2 is assembled by connecting the protective frame 3 to the outer cylinder body 1. The rear cover 2 no longer requires a complex connection structure, thus simplifying its structure. Consequently, internal defects are significantly reduced. Furthermore, with the protective frame providing support and fixation for the rear cover, the rear cover no longer needs exceptionally high strength, allowing for a thinner design while maintaining structural strength and pressure resistance. This reduces material costs, lightens weight, shrinks volume, and improves product lightweighting and energy efficiency. Additionally, the simplified rear cover structure eliminates the need for casting processes. Whether using turning or die casting, a smooth surface is ensured, achieving high-precision sealing without additional machining. This reduces production steps, shortens assembly time, lowers production costs, and ensures reliable sealing under high-pressure conditions.

[0040] Furthermore, the guardrail 3 can be made of high-strength materials, such as alloy steel or stainless steel, to provide sufficient rigidity and strength. The thickness of the guardrail 3 can be designed according to the actual pressure it will bear, ensuring that it will not deform under high pressure.

[0041] Thus, through the fitting and limiting design of the guard 3 and the rear cover 2, a stable mechanical constraint system is formed, which effectively prevents the rear cover 2 from shifting under high pressure, ensuring the reliability of the seal and the stability of the structure.

[0042] See Figure 2 As shown, in some embodiments, the back cover 2 is provided with a first positioning structure 21, and the protective frame 3 is provided with a second positioning structure 31 that is positioned corresponding to the first positioning structure 21. The back cover 2 and the protective frame 3 are positioned by the first positioning structure 21 and the second positioning structure 31 to prevent the back cover 2 from rotating.

[0043] Specifically, the guard 3 prevents the rear cover 2 from moving towards the guard 3 by fitting and limiting it. However, the guard 3 can only restrict the axial displacement of the rear cover 2 and cannot effectively restrain the circumferential rotation of the rear cover 2 at the opening 11 of the outer cylinder 1. When the rear cover 2 is subjected to asymmetrical loads or vibrations, it may rotate and shift, causing misalignment of the sealing surface and compromising airtightness. When setting the seal 5, it may cause unnecessary wear on the seal 5, thereby reducing the overall service life.

[0044] Based on this, the back cover 2 of this application is provided with a first positioning structure 21, and the protective frame 3 is provided with a second positioning structure 31 that is positioned corresponding to the first positioning structure 21. The back cover 2 and the protective frame 3 are positioned by the first positioning structure 21 and the second positioning structure 31 to prevent the back cover 2 from rotating.

[0045] Optionally, the first positioning structure 21 and the second positioning structure 31 are complementary surfaces. That is, when the first positioning structure 21 is a groove, the second positioning structure 31 is a protrusion that matches the groove shape, and vice versa. The protrusion is embedded in the groove to generate mechanical interference, thereby achieving the positioning function.

[0046] More importantly, the guard frame 3 and the outer cylinder 1 are fixed together by bolts 7 passing through their respective connecting ears. The second positioning structure 31 and the connecting ears of the guard frame 3 are machined to the same standard. When the first positioning structure 21 and the second positioning structure 31 are assembled, the positions of the connecting ears of the guard frame 3 and the connecting ears of the outer cylinder 1 are also aligned one-to-one, which facilitates the assembly of the guard frame 3 and the outer cylinder 1.

[0047] See Figures 1-4 As shown, in some embodiments, the cylinder block rear cover mounting unit further includes a support frame 4, which is disposed inside the outer cylinder block 1 and abuts against the rear cover 2 to support the rear cover 2.

[0048] Specifically, the support frame 4 is disposed in the internal cavity of the outer cylinder 1, and its axial end face forms rigid contact with the inner surface of the rear cover 2. The support frame 4 can adopt a ring frame structure to support and limit the rear cover 2. Correspondingly, since the support frame 4 is only used to support the rear cover 2, the material of the support frame 4 can be lightweight engineering plastic or aluminum alloy, which optimizes weight while ensuring support rigidity. Furthermore, when the support frame 4 is made of engineering plastic, the overall manufacturing cost can be reduced.

[0049] See Figure 4 As shown, in some embodiments, the support frame 4 is provided with a plurality of support seats 41 on the side facing the rear cover 2, and all of the support seats 41 are in contact with the rear cover 2.

[0050] Specifically, multiple support seats 41 can be distributed in a ring array along the edge of the support frame 4. The multiple support seats 41 form a distributed load-bearing network through discrete contact points, and each support seat 41 transfers the local load to the main body of the support frame 4. Under high-pressure gas impact conditions, the deformation generated by the rear cover 2 is decomposed into several small displacement components by the multiple support seats 41. Each support seat 41 absorbs the impact energy through elastic deformation, or transfers the impact energy to the main body of the support frame 4 and then to the outer cylinder 1. When the support seats 41 are arranged at equal intervals, the symmetrical support structure they form can balance the circumferential stress distribution and avoid the torque effect caused by asymmetrical loads.

[0051] The close contact of multiple support bases 41 improves the stability of the rear cover 2 under high-pressure impact, preventing sealing failure caused by a single support point or insufficient contact. This support structure layout enhances the load-bearing capacity of the rear cover 2 and the reliability of the overall structure in a more efficient manner within a limited space.

[0052] In some embodiments, the inner wall of the outer cylinder 1 facing the opening 11 is provided with a first stepped surface 12, and the support frame 4 abuts against the first stepped surface 12.

[0053] Specifically, the first stepped surface 12 on the inner wall of the outer cylinder 1 provides a rigid contact reference for the support frame 4. During assembly, the support frame 4 is directly pushed against the first stepped surface 12 to complete axial positioning without the need for additional fasteners. When subjected to high-pressure impact, the rear cover 2 transfers the load to the support frame 4. The surface contact between the support frame 4 and the first stepped surface 12 converts the load into radially distributed compressive stress, which is offset by the rigidity of the outer cylinder 1's own annular structure. The axial limiting function of the first stepped surface 12, combined with the circumferential continuity of the support frame 4, eliminates the risk of swaying of the support frame 4 within the outer cylinder 1.

[0054] In some embodiments, the rear cover 2 is provided with an air nozzle 3 in the middle to balance the internal and external air pressure according to the needs of the outer cylinder 1.

[0055] In some embodiments, the back cover 2 is made of aluminum.

[0056] Specifically, aluminum's ductility allows for uniform plastic deformation during profile stretching, resulting in a high elongation rate and a seamless, defect-free integrated structure. Aluminum also boasts superior yield strength, which, through work hardening, enhances the load-bearing capacity of the back cover 2, enabling it to meet strength requirements under high-pressure conditions without relying on additional thickness compensation.

[0057] Through the above technical solution, this application combines an aluminum back cover 2 with a profile stretching process to form a dense, non-porous integrated structure, avoiding the risk of leakage caused by internal material defects. The lightweight nature of aluminum reduces the thickness redundancy requirement of the back cover 2, reducing material consumption while ensuring structural strength. In addition, the aluminum back cover 2 has a high surface finish, simplifying the production process and meeting the sealing surface precision requirements without secondary processing.

[0058] See Figure 5-7 As shown, in some embodiments, a sealing element 5 is provided between the rear cover 2 and the outer cylinder 1, and the rear cover 2 is sealed to the outer cylinder 1 through the sealing element 5.

[0059] Specifically, the seal 5 is configured as a ring structure made of elastic material, fitted onto the contact portion between the rear cover 2 and the cylinder body. Because the surface of the rear cover 2, formed by the profile stretching process, has fine lines along the stretching direction, the seal 5 fills the gaps between these lines through elastic deformation, blocking the leakage path of gas along the surface lines. With this seal 5, the rear cover 2 manufactured by the profile stretching process can meet the sealing requirements without secondary machining.

[0060] See Figure 5-7 As shown, in some embodiments, the rear cover 2 has an annular groove 22 on the side facing the inside of the cylinder body, and the sealing element 5 is a sealing ring. The sealing ring is fitted inside the annular groove 22. When the rear cover 2 is assembled onto the outer cylinder body 1, the annular groove 22 is located inside the outer cylinder body 1, and the sealing ring fits against the inner wall of the outer cylinder body 1, thereby sealing the opening 11 of the outer cylinder body 1. The annular groove 22 improves the stability of the sealing ring, preventing displacement due to slight displacement of the rear cover 2, and also facilitates the installation of the sealing ring. More importantly, the cooperation between the annular groove 22 and the sealing ring extends the gas escape path, thereby improving the airtightness of the outer cylinder body 1 and the rear cover 2 after assembly.

[0061] This application further proposes a technical solution including an inner cylinder block 6 and a cylinder block rear cover mounting unit, wherein the cylinder block rear cover mounting unit includes a rear cover 2 and a protective frame 3. The rear cover 2 is set at the opening 11 of the outer cylinder block 1 and fixed by the protective frame 3, and the inner cylinder block 6 is integrated into the internal space of the outer cylinder block 1.

[0062] This application further proposes a technical solution including an inner cylinder block 6 and a cylinder block rear cover mounting unit, wherein the cylinder block rear cover mounting unit includes a rear cover 2 and a protective frame 3. The rear cover 2 is set at the opening 11 of the outer cylinder block 1 and fixed by the protective frame 3, and the inner cylinder block 6 is integrated into the internal space of the outer cylinder block 1.

[0063] Optionally, the inner cylinder 6 is located inside the outer cylinder 1. Based on the structure of the support frame 4, the support frame 4 has a second step surface 43 on the side facing the inner cylinder 6 for fixing the inner cylinder 6. The inner cylinder 6 abuts against the second step surface 43, thereby completing the positioning of the inner cylinder 6 and ensuring that the inner cylinder 6 maintains a stable posture during use, thus ensuring the overall stability of the inner cylinder 6.

[0064] In some embodiments, the support frame 4 is provided with a vent 42, which forms a gap between the outer cylinder 1 and the inner cylinder 6 and the internal cavity of the inner cylinder 6, thereby increasing the volume of the air chamber communicating with the rear of the piston, thereby improving the nailing power of the nail gun.

[0065] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A cylinder back cover mounting unit characterized by comprising: It comprises: an outer cylinder (1) in a cylindrical shape, one end of which is provided with an opening (11); a rear cover (2) arranged at the opening (11) and sealing the opening (11); a guard frame (3) fixedly connected to the end of the outer cylinder (1) provided with the opening (11), the rear cover (2) being located on the side of the guard frame (3) facing the outer cylinder (1), and the guard frame (3) being at least in contact with part of the rear cover (2) to limit the movement of the rear cover (2) towards the guard frame (3).

2. The cylinder head cover mounting unit according to claim 1, characterized in that The rear cover (2) is provided with a first positioning structure (21), and the guard frame (3) is provided with a second positioning structure (31) corresponding to the first positioning structure (21), and the rear cover (2) and the guard frame (3) are positioned by the first positioning structure (21) and the second positioning structure (31) to prevent the rear cover (2) from rotating.

3. The cylinder head cover mounting unit of claim 1, wherein It also comprises a support frame (4) arranged inside the outer cylinder (1) and abutting against the rear cover (2) to support the rear cover (2).

4. The cylinder head cover mounting unit of claim 3, wherein The side of the support frame (4) facing the rear cover (2) is provided with a plurality of support seats (41), all of which are in contact with the rear cover (2).

5. The cylinder head cover mounting unit of claim 3, wherein The inner wall of the side of the outer cylinder (1) facing the opening (11) is provided with a first step surface (12), and the support frame (4) abuts against the first step surface (12).

6. A cylinder head cover mounting unit according to any one of claims 1 to 5, characterized in that The middle of the rear cover (2) is provided with an air nozzle (23).

7. A cylinder head cover mounting unit according to any one of claims 1 to 5, characterized in that The rear cover (2) is made of aluminum.

8. A cylinder head cover mounting unit according to any one of claims 1 to 5, characterized in that A sealing element (5) is arranged between the rear cover (2) and the outer cylinder (1), and the rear cover (2) is sealingly connected to the outer cylinder (1) through the sealing element (5).

9. A force providing device, characterized in that It comprises: an inner cylinder (6); The cylinder rear cover mounting unit according to any one of claims 1-8, the inner cylinder (6) being arranged inside the outer cylinder (1).

10. A nail gun, characterized by, It comprises the cylinder rear cover mounting unit according to any one of claims 1-8.

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