Cylinder body rear cover mounting unit, force supply device and nail gun

Abstract

The invention discloses a cylinder body rear cover mounting unit, a force supply device and a nail gun, the cylinder body rear cover mounting unit comprises an outer cylinder body, a rear cover and a protective frame, one end of the outer cylinder body is provided with an opening, the rear cover is arranged at the opening of the outer cylinder body and seals the opening, and the protective frame is fixedly connected with the end, provided with the opening, of the outer cylinder body; the rear cover is located on the side, facing the outer cylinder body, of the protective frame, the protective frame is at least attached to part of the rear cover for limiting so as to prevent the rear cover from moving towards the protective frame, the rear cover is connected with the outer cylinder body through the protective frame, and therefore a structural foundation is provided for simplified machining of the rear cover structure, and meanwhile machining of the rear cover can be facilitated on the basis that the rear cover structure is simplified; on the basis that the protective frame provides supporting and fixing for the rear cover, the rear cover does not need large strength any more, the rear cover is allowed to be thinned, meanwhile, the structural strength and the pressure resistance are guaranteed, the material cost is reduced, the self weight is reduced, the size is reduced, and the light weight and the energy efficiency of products are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nail guns, and in particular to a cylinder rear cover installation unit, a force supply device, and a nail gun. Background Art

[0002] At present, the outer shell of the force supply structure of a nail gun mainly consists of a main body part and a rear cover, and both are usually produced by the same casting process. This design is based on the convenience of traditional manufacturing processes and uses casting technology to achieve low-cost mass production of complex shapes. However, the prior art has the following significant defects:

[0003] The rear cover needs to withstand instantaneous high-pressure gas impact during firing. However, the casting process is prone to internal defects such as pores, shrinkage porosity, and cracks. These defects will expand into leakage channels under high-pressure cyclic loads, resulting in the failure of the force supply structure. Based on the above structural defects, generally, the thickness of the rear cover is increased to compensate for the defects of the casting process, thereby providing a safety margin. Although with the continuous improvement of the casting process, the current porosity can be reduced to a very low level by advanced casting auxiliary equipment, due to the latent characteristics of pore defects, even if the casting process has been improved, it is still impossible to compress the thickness of the rear cover during the production of the rear cover, that is, the design thickness of the rear cover for safety margin considerations still needs to be retained, which in turn leads to problems such as material waste, heavy self-weight, large volume, and increased cost.

[0004] Moreover, during the assembly process of the outer shell of the force supply structure, the rear cover needs to be assembled with the main body part. Correspondingly, there are requirements for the airtightness of the contact part between the rear cover and the main body part. However, the surface of the rear cover processed by the casting process is relatively rough and cannot be directly used in scenarios with high airtightness requirements and high air pressure. It also needs to be secondarily processed on the surface of the cast rear cover before it can be used, resulting in an increase in the number of processes and further leading to an increase in time cost and production cost. Summary of the Invention

[0005] In order to overcome at least one of the above-mentioned defects of the prior art, the present invention provides a cylinder rear cover installation unit, a force supply device, and a nail gun. It can solve the problems of material waste, heavy self-weight, large volume, increased cost, and increased time cost and production cost caused by secondary processing of the rear cover produced by the casting process.

[0006] The technical solution adopted by the present invention to solve its problems is:

[0007] A cylinder rear cover installation unit includes:

[0008] An outer cylinder, one end of the outer cylinder is provided with an opening;

[0009] A rear cover, a sealing member is provided between the rear cover and the outer cylinder body, and the rear cover is sealingly connected to the outer cylinder body through the sealing member;

[0010] A protective frame, the protective frame is fixedly connected to one end of the outer cylinder body where the opening is provided, the rear cover is located on one side of the protective frame facing the outer cylinder body, and the protective frame is at least in contact with and limits the position of part of the rear cover to prevent the rear cover from moving towards the protective frame.

[0011] Further, the rear cover is provided with a first positioning structure, the protective frame is provided with a second positioning structure corresponding to and positioning with the first positioning structure, and the rear cover and the protective frame are positioned through the first positioning structure and the second positioning structure to prevent the rear cover from rotating.

[0012] Further, it further includes a support frame, the support frame is arranged inside the outer cylinder body, and the support frame abuts against the rear cover to support the rear cover.

[0013] Further, a plurality of support seats are provided on one side of the support frame facing the rear cover, and all the support seats are in contact with the rear cover.

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

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

[0016] Further, the rear cover is made of aluminum.

[0017] Further, the rear cover is provided with a counterbore structure, and the protective frame is snap-fitted with the counterbore structure.

[0018] The present invention also provides a power supply device, including:

[0019] An inner cylinder body;

[0020] The above-mentioned cylinder body rear cover installation unit, the inner cylinder body is arranged inside the outer cylinder body.

[0021] The present invention also provides a nail gun, including the above-mentioned cylinder body rear cover installation unit.

[0022] In summary, a cylinder body rear cover installation unit, a power supply device and a nail gun provided by the present invention have the following technical effects:

[0023] 1. The rear cover is connected to the outer cylinder block by a protective frame, which provides a structural basis for the simplified processing of the rear cover structure. Meanwhile, on the basis of the simplified rear cover structure, the processing of the rear cover can be facilitated, and thus internal defects can be significantly reduced. Moreover, on the structural basis that the protective frame provides support and fixation for the rear cover, the rear cover no longer requires particularly high strength, and thus a thinner design of the rear cover is allowed while ensuring structural strength and pressure resistance, reducing material costs, lightening the self-weight, shrinking the volume, and enhancing the product lightweight and energy efficiency;

[0024] 2. The simple rear cover structure no longer needs to be processed by the casting process. Whether it is processed by turning or die-casting, the smoothness of the rear cover surface can be ensured, and thus high-precision sealing can be achieved without additional processing, reducing production processes, shortening the assembly time, reducing production costs, and ensuring the sealing reliability under high-pressure conditions. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 is an exploded structure schematic diagram of the present invention;

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

[0028] Figure 4 is a schematic diagram of the support frame structure of the present invention;

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

[0030] Figure 6 is of the present invention Figure 5 an enlarged view of part A;

[0031] Figure 7 is an exploded structure schematic diagram of the rear cover, protective frame and seal of Embodiment 2 of the present invention.

[0032] Among them, the meanings of the reference numerals are as follows: 1, outer cylinder block; 11, opening; 12, first stepped surface; 2, rear cover; 21, first positioning structure; 22, annular groove; 23, air nozzle; 24, counterbore structure; 3, protective frame; 31, second positioning structure; 4, support frame; 41, support seat; 42, ventilation hole; 43, second stepped surface; 5, seal; 6, inner cylinder block; 7, bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all of the examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0034] For the convenience of understanding the embodiments of the present invention, the following will take specific embodiments as examples and make further explanatory descriptions in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation on the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] Refer to Figures 1 - 7 , the present invention discloses a cylinder block rear cover mounting unit, including an outer cylinder block 1, a rear cover 2 and a protective frame 3. One end of the outer cylinder block 1 is provided with an opening 11. The rear cover 2 is arranged at the opening 11 of the outer cylinder block 1, and the rear cover 2 seals the opening 11. The protective frame 3 is fixedly connected to the end of the outer cylinder block 1 where the opening 11 is provided. The rear cover 2 is located on one side of the protective frame 3 facing the outer cylinder block 1. The protective frame 3 is at least in contact with and limits the position of part of the rear cover 2 to prevent the rear cover 2 from moving towards the protective frame 3.

[0038] Specifically, refer to Figures 1 - 3As shown, one end of the outer cylinder body 1 is provided with an opening 11, and the rear cover 2 is provided at the opening 11 of the outer cylinder body 1 and is sealed and connected to the opening 11. The guard frame 3 can adopt an annular structure to surround the end of the opening 11 of the outer cylinder body 1, and the fixed connection method includes but is not limited to welding, bolt 7 connection or snap lock. The annular guard frame 3 and the outer cylinder body 1 form a rigid support structure. When the high-pressure gas impacts the rear cover 2, the tendency of the rear cover 2 to move outward is directly blocked by the continuous fitting surface of the guard frame 3. The guard frame 3 can be an iron stamping part, which has high material strength, low production cost, good durability, and can provide a stable limit for the rear cover 2. And based on the structural strength advantage of the guard frame 3 using an iron stamping part, it is also conducive to the lightweight design of the guard frame 3.

[0039] Through the above scheme, the rear cover 2 is assembled by connecting the guard frame 3 with the outer cylinder body 1. The rear cover 2 no longer needs to be provided with a relatively complex connection structure, thereby simplifying the structure of the rear cover 2. Correspondingly, it can significantly reduce internal defects, and on the basis of the structure that the guard frame provides support and fixation for the rear cover, the rear cover no longer needs a particularly large strength, thereby allowing the rear cover to be designed to be thinner, while ensuring structural strength and pressure resistance, reducing material costs, reducing deadweight, reducing volume, and improving product lightweight and energy efficiency. In addition, the simple rear cover structure no longer needs to be processed by casting technology. Whether it is turning or die-casting, it can ensure the smoothness of the rear cover surface, and can achieve high-precision sealing without additional processing, reducing production processes, shortening assembly time, reducing production costs, and ensuring sealing reliability under high-pressure conditions.

[0040] See also Figures 5 - 7 As shown, in some embodiments, a seal 5 is provided between the rear cover 2 and the outer cylinder body 1 , and the rear cover 2 is sealed and connected to the outer cylinder body 1 via the seal 5 .

[0041] Specifically, the seal 5 is configured as an annular structure made of elastic material, and is sleeved on the contact part between the rear cover 2 and the cylinder body. Since there are fine lines along the stretching direction on the surface of the rear cover 2 formed by the profile stretching process, the seal 5 fills the gaps between the lines through elastic deformation, blocking the leakage path of the gas along the surface lines. With the setting of the seal 5, the rear cover 2 manufactured by the profile stretching process can meet the sealing requirements without secondary machining.

[0042] Furthermore, the guard frame 3 can be made of high-strength material, such as alloy steel or stainless steel, to provide sufficient rigidity and strength. The thickness of the guard frame 3 can be designed according to the actual pressure to be borne to ensure that it will not deform under high pressure.

[0043] Therefore, through the fitting and limiting design of the guard frame 3 and the back cover 2, a stable mechanical restraint system is formed, which effectively prevents the displacement of the back cover 2 under high pressure and ensures the reliability of the seal and the stability of the structure.

[0044] The sunken platform structure 24 facilitates the installation and positioning of the protective frame 3, and improves the stability of the relative position between the protective frame 3 and the rear cover 2.

[0045] Refer to Figure 2 As shown, in some embodiments, the rear cover 2 is provided with a first positioning structure 21, the protective frame 3 is provided with a second positioning structure 31 corresponding to the first positioning structure 21 for positioning, and the rear cover 2 and the protective frame 3 are positioned by the first positioning structure 21 and the second positioning structure 31 to prevent the rear cover 2 from rotating.

[0046] Specifically, since the protective frame 3 prevents the rear cover 2 from moving towards the protective frame 3 by fitting and limiting, however, the protective frame 3 can only limit the axial displacement of the rear cover 2 and cannot effectively restrict the circumferential rotation of the rear cover 2 at the opening 11 of the outer cylinder 1. The rear cover 2 may rotate and shift when subjected to asymmetric loads or vibrations, resulting in misalignment of the sealing surface and damage to the airtightness. When setting the seal 5, it may cause unnecessary wear of the seal 5, thereby reducing the overall service life.

[0047] Based on this, the rear cover 2 of the present application is provided with a first positioning structure 21, the protective frame 3 is provided with a second positioning structure 31 corresponding to the first positioning structure 21 for positioning, and the rear cover 2 and the protective frame 3 are positioned by the first positioning structure 21 and the second positioning structure 31 to prevent the rear cover 2 from rotating.

[0048] 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 convex block corresponding to the groove shape of the groove, and vice versa. Mechanical interference is generated by the convex block being embedded in the groove to play a positioning role.

[0049] More importantly, the protective frame 3 and the outer cylinder 1 are fixed by bolts 7 passing through their respective connecting ears provided respectively. The processing reference of the second positioning structure 31 and the connecting ear of the protective frame 3 is unified. After the first positioning structure 21 and the second positioning structure 31 are assembled in contrast during assembly, the positions of the connecting ears of the protective frame 3 and the connecting ears of the outer cylinder 1 are also in one-to-one correspondence, thus facilitating the assembly of the protective frame 3 and the outer cylinder 1.

[0050] Refer to Figures 1 - 4 As shown, in some embodiments, the cylinder rear cover installation unit further includes a support frame 4. The support frame 4 is provided inside the outer cylinder 1, and the support frame 4 abuts against the rear cover 2 to support the rear cover 2.

[0051] Specifically, the support frame 4 is arranged in the inner cavity of the outer cylinder body 1, and its axial end face forms a rigid contact with the inner surface of the rear cover 2. The support frame 4 can adopt an annular 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 selected from lightweight engineering plastics or aluminum alloys, which can achieve weight optimization while ensuring the support rigidity, and when the support frame 4 adopts engineering plastics, it can also reduce the overall manufacturing cost.

[0052] See also Figure 4 As shown, in some embodiments, a plurality of support seats 41 are provided on the side of the support frame 4 facing the back cover 2 , and all of the support seats 41 are in contact with the back cover 2 .

[0053] Specifically, multiple support seats 41 can be distributed in a circular array along the edge of the support frame 4. 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 the high-pressure gas impact condition, the deformation generated by the rear cover 2 is decomposed into a number of small displacement components by multiple support seats 41. Each support seat 41 absorbs the impact energy through elastic deformation, or transmits the impact energy to the main body of the support frame 4 through the support seat 41 and then to the outer cylinder 1. When the support seats 41 are arranged at equal intervals, the symmetrical support structure formed by them can balance the circumferential stress distribution and avoid the torque effect caused by asymmetric loads.

[0054] The stability of the rear cover 2 under high pressure impact is improved by the close contact of multiple support seats 41, and the sealing failure caused by a single support point or insufficient contact is prevented. This support structure layout enhances the bearing capacity of the rear cover 2 and the reliability of the overall structure in a more efficient manner within a limited space.

[0055] In some embodiments, a first step surface 12 is formed on the inner wall of the outer cylinder body 1 facing the opening 11 , and the support frame 4 abuts against the first step surface 12 .

[0056] Specifically, the first step surface 12 of the inner wall of the outer cylinder body 1 provides a rigid contact reference for the support frame 4. During the assembly process, the support frame 4 is directly pushed against the first step surface 12 to complete the 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 step surface 12 converts the load into radially distributed compressive stress, and the outer cylinder body 1 offsets this stress through its own annular structural stiffness. The axial limiting function of the first step surface 12 combined with the circumferential continuity of the support frame 4 can eliminate the risk of shaking of the support frame 4 in the outer cylinder body 1.

[0057] In some embodiments, a gas nozzle 3 is provided in the middle of the rear cover 2 to balance the internal and external air pressures according to the requirements inside the outer cylinder 1 .

[0058] In some embodiments, the rear cover 2 is made of aluminum.

[0059] Specifically, the ductility of aluminum enables it to undergo uniform plastic deformation during the profile stretching process, with a relatively high stretching rate, thus forming an integrated structure without internal defects. The yield strength of aluminum material is also excellent, and through the work-hardening effect, the load-bearing capacity of the rear cover 2 can be improved, enabling it to meet the strength requirements without relying on additional thickness compensation in high-pressure scenarios.

[0060] Through the above technical solution, the rear cover 2 made of aluminum in this application is combined with the profile stretching process to form a dense and airtight integrated structure, avoiding the leakage risk caused by internal defects of the material. The lightweight characteristic of the aluminum material reduces the thickness redundancy requirement of the rear cover 2, reduces material consumption, and ensures the structural strength. In addition, the surface finish of the aluminum rear cover 2 is relatively high, simplifying the production process and meeting the sealing surface accuracy requirements without secondary processing.

[0061] In some embodiments, the rear cover 2 is provided with a counterbore structure 24, and the guard frame 3 is snap-fitted with the counterbore structure 24. The counterbore structure 24 facilitates the installation and positioning of the guard frame 3, improving the stability of the relative position between the guard frame 3 and the rear cover 2

[0062] Refer to Figures 5 - 7 As shown, in some embodiments, the rear cover 2 is provided with an annular groove 22 on the side facing the inside of the cylinder block. The seal 5 is an O-ring, and the O-ring is sleeved in the annular groove 22. When the rear cover 2 is assembled to the outer cylinder block 1, the annular groove 22 is located inside the outer cylinder block 1, and the O-ring is in contact with the inner wall of the outer cylinder block 1, thereby realizing the sealing of the opening 11 of the outer cylinder block 1. The provision of the annular groove 22 can improve the stability of the O-ring and prevent the O-ring from shifting with the slight displacement of the rear cover 2. Moreover, the annular groove 22 also facilitates the installation of the O-ring. More importantly, the cooperation of the annular groove 22 and the O-ring extends the route of gas escape, thereby improving the airtightness of the combination of the outer cylinder block 1 and the rear cover 2.

[0063] This application further proposes a technical solution including an inner cylinder block 6 and a cylinder block rear cover installation unit. The cylinder block rear cover installation unit includes a rear cover 2 and a guard frame 3. The rear cover 2 is arranged at the opening 11 of the outer cylinder block 1 and is fixed by the guard frame 3, and the inner cylinder block 6 is integrated into the internal space of the outer cylinder block 1.

[0064] This application further proposes a technical solution including an inner cylinder block 6 and a cylinder block rear cover installation unit. The cylinder block rear cover installation unit includes a rear cover 2 and a guard frame 3. The rear cover 2 is arranged at the opening 11 of the outer cylinder block 1 and is fixed by the guard frame 3, and the inner cylinder block 6 is integrated into the internal space of the outer cylinder block 1.

[0065] Optionally, the inner cylinder body 6 is disposed inside the outer cylinder body 1. On the basis of the structure of the support frame 4, a second stepped surface 43 for fixing the inner cylinder body 6 is provided on one side of the support frame 4 facing the inner cylinder body 6. The inner cylinder body 6 abuts against the second stepped surface 43, thereby completing the positioning of the inner cylinder body 6, so that the inner cylinder body 6 maintains a stable posture during use, thus ensuring the overall stability of the inner cylinder body 6.

[0066] In some embodiments, the support frame 4 is provided with a vent hole 42, and the vent hole 42 forms a connection between the gap between the outer cylinder body 1 and the inner cylinder body 6 and the internal cavity of the inner cylinder body 6, thereby increasing the volume of the air chamber communicating with the rear part of the piston, and thus improving the nail shooting power of the nail gun.

[0067] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A cylinder block rear cover mounting unit, characterized in that, Comprising: An outer cylinder body (1), the outer cylinder body (1) is cylindrical, and one end of the outer cylinder body (1) is provided with an opening (11); A rear cover (2), a sealing member (5) is provided between the rear cover (2) and the outer cylinder body (1), and the rear cover (2) is hermetically connected to the outer cylinder body (1) through the sealing member (5); A guard frame (3), the guard frame (3) is fixedly connected to the end of the outer cylinder body (1) provided with the opening (11), the rear cover (2) is located on the side of the guard frame (3) facing the outer cylinder body (1), and the guard frame (3) is at least in contact with and limits the position of part of the rear cover (2) to prevent the rear cover (2) from moving towards the guard frame (3).

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

3. The cylinder block rear cover mounting unit according to claim 1, characterized in that, It further includes a support frame (4), the support frame (4) is arranged inside the outer cylinder body (1), and the support frame (4) abuts against the rear cover (2) to support the rear cover (2).

4. The cylinder block rear cover mounting unit according to claim 3, wherein, A plurality of support seats (41) are provided on the side of the support frame (4) facing the rear cover (2), and all the support seats (41) are in contact with the rear cover (2).

5. The cylinder block rear cover mounting unit according to claim 3, characterized in that, The inner wall of the outer cylinder body (1) on the side facing the opening (11) is provided with a first stepped surface (12), and the support frame (4) abuts against the first stepped surface (12).

6. A cylinder block rear cover mounting unit according to any one of claims 1-6, characterized in that, A nozzle (23) is provided in the middle of the rear cover (2).

7. A cylinder block rear cover mounting unit according to any one of claims 1-6, characterized in that, The rear cover (2) is made of aluminum.

8. A cylinder block rear cover mounting unit according to any one of claims 1-6, characterized in that, The rear cover (2) is provided with a counterbore structure (24), and the guard frame (3) is snap-connected to the counterbore structure (24).

9. A power supply device, characterized in that, Comprising: An inner cylinder body (6); The cylinder body rear cover mounting unit according to any one of claims 1-8, the inner cylinder body (6) is arranged inside the outer cylinder body (1).

10. A nail gun, characterized in that, Comprising the cylinder body rear cover mounting unit according to any one of claims 1-8.

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