High-strength lithium electric nail gun with composite energy storage structure

Abstract

This invention discloses a high-strength lithium-ion electric nail gun with a composite energy storage structure, which includes a gun body with an energy storage structure installed at the tail of the gun body, comprising a spring compression mechanism and a vacuum cylinder mechanism. The spring compression mechanism mainly comprises a compression chamber, a spring, a spring piston, and an operating piston rod. The spring and spring piston are installed in the compression chamber, the front end of the spring piston is connected to the operating piston rod, and an upper rack structure is installed below the operating piston rod. The vacuum cylinder mechanism includes a cylinder body and a cylinder piston, which forms a completely sealed vacuum chamber with the tail end of the cylinder body. A lower rack structure is installed above the vacuum cylinder piston rod, and the lower rack structure engages with the upper rack structure via a transmission gear to transmit power. The energy storage structure designed in this invention combines the spring compression mechanism and the vacuum cylinder mechanism to double the energy storage strength and effectively reduce the axial and radial vibration problems at the end of the nail driving operation.

Description

[Technical Field]

[0001] The present invention relates to a handheld lithium electric nail gun, and more particularly to a high-strength lithium electric nail gun with a composite energy storage structure. [Background technology]

[0002] The lithium electric nail gun is a handheld lithium electric nailing tool that is widely used in the construction, renovation and furniture industries.

[0003] The most widely used lithium electric nail guns today are designed to use a motor, a reducer, and a rotary transmission mechanism to drive a piston, compress a spring to store energy, and then release the compressed spring to fire a nail. In this design, the efficiency of the transmission mechanism, the resistance of the spring guide, the elastic modulus of the spring, the weight of the repulsion member, the repulsion force of the spring, etc., affect the nail driving strength and operating comfort.

[0004] After years of use, it has been found that the structure of existing lithium electric nail guns has two main problems: 1) When energy is stored using a spring alone, the strength of the stored energy is limited by the length and rigidity of the spring itself, making it difficult to meet the requirements of some high-intensity nailing tasks.

[0005] 2) After the nailing is completed, the spring will be affected by the reaction force and the axial vibration will increase, which will increase the repulsive force, reducing the comfort of operation and increasing the fatigue strength of the operator. Summary of the Invention [Problem to be solved by the invention]

[0006] To address the above-mentioned problems, the present invention designs a high-strength lithium-ion electric nail gun with a composite energy storage structure. The energy storage structure combines a spring compression mechanism and a cylinder mechanism, which not only doubles the energy storage strength but also effectively suppresses the axial and radial vibration problems at the end of nailing, reducing the burden on the worker and improving the comfort of nailing work. [Means for solving the problem]

[0007] To solve the above problems, the present invention adopts the following technical solutions. A high-strength lithium-ion electric nail gun with a composite energy storage structure, the electric nail gun includes a gun body, and an energy storage structure is installed at the tail of the gun body, the energy storage structure is composed of a spring compression mechanism and a vacuum cylinder mechanism which are linked together, the spring compression mechanism mainly includes a compression chamber, a spring, a spring piston and an operating piston rod, the spring and the spring piston are installed in the compression chamber, the tail end of the spring is held in contact with the bottom of the compression chamber, and the front end of the spring is held in contact with the spring piston, so that in an initial state, the spring is given a pre-compression amount so that the spring piston always tends to move forward, and the spring piston The front end of the vacuum cylinder mechanism is connected to an operating piston rod that drives the gun needle to operate synchronously, and an upper rack structure is installed under the operating piston rod. The vacuum cylinder mechanism includes a cylinder body and a cylinder piston installed in the cylinder body, and the cylinder piston and the rear end (rear end) of the cylinder body form a completely sealed vacuum chamber. In the initial state, the cylinder piston is located at the rear end of the cylinder body, and the front end of the cylinder piston is connected to a vacuum cylinder piston rod extending from the cylinder body. A lower rack structure is installed above the vacuum cylinder piston rod, and the lower rack structure engages with the upper rack structure via a transmission gear fixed to the gun body to transmit power. At the same time, a transmission structure is installed at the front end of the vacuum cylinder piston rod, and the transmission structure is transmission-connected to the drive mechanism.

[0008] More specifically, the lower rack structure is meshed with the upper rack structure via a transmission gear to transmit power, and the teeth of the lower rack structure, the transmission gear and the upper rack structure are straight, helical or arcuate.

[0009] More specifically, a spring seat for positioning the spring is provided at the tail of the spring compression chamber.

[0010] More specifically, when nailing is completed, the front side of the last tooth of the upper rack structure of the operating piston rod is separated from the transmission gear.

[0011] More specifically, the transmission structure includes a drive arm installed under the front end of the vacuum cylinder piston rod, and the drive arm is equipped with a first push end and a second push end that are two-stage transmitted with the drive mechanism.

[0012] More specifically, the rear end of the driving arm directly forms the second pushing end, and the front end of the driving arm extends downward a certain distance to form the first pushing end, and the height of the first pushing end is lower than that of the second pushing end.

[0013] More specifically, the drive arm and the vacuum cylinder piston rod are integrally molded.

[0014] More specifically, the drive arm and the vacuum cylinder piston rod are installed separately, and the entire drive arm is fixed to the vacuum cylinder piston rod by a number of screws.

[0015] More specifically, the driving mechanism mainly includes a driving motor, a reducer, and a crank gear. The driving motor is directly connected to the reducer, and a unidirectional output shaft is installed on the reducer. The output shaft is equipped with transmission teeth. The crank gear is installed at the rear of the output shaft and is meshed with the transmission teeth. The crank gear has a first pressing protrusion and a second pressing protrusion installed on the upper end surface of the crank gear, spaced apart circumferentially. The height of the first pressing protrusion is lower than that of the second pressing protrusion. The first pressing protrusion corresponds to the position of the first pressing end, and the second pressing protrusion corresponds to the position of the second pressing end. When the crank gear rotates, the first pressing protrusion first contacts the first pressing end and presses the first pressing end to drive the vacuum cylinder piston rod forward, thereby achieving the first stage of energy storage. After the first stage of energy storage is completed, the second pressing protrusion contacts the second pressing end and presses the second pressing end to continue moving the vacuum cylinder piston rod forward, thereby achieving the second stage of energy storage.

[0016] More specifically, a mounting seat is provided above the front section of the operating piston rod, a connecting platform is formed on the top of the mounting seat, a connecting hole is provided in the connecting platform, and the connecting hole is movably connected to the tail of the gun needle via a screw.

[0017] The high-strength lithium electric nail gun designed in this invention has an energy storage structure that combines a spring compression mechanism and a vacuum cylinder mechanism that are interlocked with each other.

[0018] When in operation, the driving mechanism drives the vacuum cylinder piston rod forward, which synchronously drives the cylinder piston forward, continuously increasing the vacuum chamber in the cylinder body and performing vacuum energy storage operation. Meanwhile, the forward movement of the vacuum cylinder piston rod retracts the working piston rod through the meshing transmission of the transmission gear, further compressing the spring and storing spring compression energy. The above vacuum energy storage and spring compression energy storage simultaneously constitute the power source for the gun needle's nailing operation. When the driving mechanism separates from the vacuum cylinder piston rod, the restoring force of the compressed spring becomes the first driving force, quickly ejecting the working piston rod. At the same time, the expanded vacuum chamber generates a strong backward suction force on the cylinder piston due to the action of atmospheric pressure, which drives the cylinder piston and vacuum cylinder piston rod to quickly retract. Meanwhile, the retraction of the vacuum cylinder piston rod generates a second driving force that moves the working piston rod forward through the meshing transmission of the transmission gear, and the above first driving force and second driving force together constitute the driving force of the gun needle. This provides double the nailing strength compared to a single spring energy storage mechanism, improving nail penetration force and nail speed, and meeting the needs of high-intensity nailing work.

[0019] The vacuum cylinder mechanism also provides a good buffering effect for the spring compression mechanism. After the nail is driven, the vacuum chamber still exerts an adhesive force on the cylinder piston, generating a second driving force that constantly pushes the working piston forward. This second driving force effectively offsets the reaction force generated when the spring hits the nailing end point, providing a good buffering effect and eliminating the axial and radial vibrations of the spring after the nail is driven, improving the operating comfort of the nail gun and reducing operator fatigue. [Brief explanation of the drawings]

[0020] In order to more clearly explain the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without making any creative efforts. [Figure 1] Schematic diagram of the three-dimensional structure of the present invention. [Figure 2] FIG. [Figure 3] FIG. 2 is a cross-sectional view of the present invention when storing energy. DETAILED DESCRIPTION OF THE INVENTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, but obviously, the described embodiments are only a part of the embodiments of the present invention, and are not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are included in the scope of protection of the present invention.

[0022] As shown in FIGS. 1 to 3, the high-strength lithium electric nail gun with a composite energy storage structure includes a gun body 1, and an energy storage structure is installed at the tail of the gun body 1.

[0023] The energy storage structure is a composite structure consisting of a spring compression mechanism 2 and a vacuum cylinder mechanism 3 that are linked together.

[0024] Here, the spring mechanism 2 mainly includes a compression chamber 21, a spring 22, a spring piston 23 and an operating piston rod 24.

[0025] The spring 22 and the spring piston 23 are sequentially mounted in the compression chamber 21, with the rear end of the spring 22 abutting and held against the bottom of the compression chamber 21 and the front end of the spring 22 abutting and connected to the spring piston 23, so that in the initial state, the spring 22 is given a pre-compression amount so that it always tends to move the spring piston 23 forward.

[0026] To ensure centering and effective positioning of the spring 22 during operation, the rear of the spring compression chamber 21 is provided with a spring seat 221 for positioning the spring 22 .

[0027] The front end of the spring piston 23 is connected to an actuating piston rod 24 that drives the gun needle 4 to operate synchronously, and the front end of the actuating piston rod 24 extends from the compression chamber 21, and a row of upper rack structures 241 is installed below it.

[0028] The vacuum cylinder mechanism 3 includes a cylinder body 31 and a cylinder piston 32 installed in the cylinder body 31. The cylinder piston 32 and the rear end (rear end) of the cylinder body 31 form a completely sealed vacuum chamber 3a. In the initial state, the cylinder piston 32 is located at the rear end portion of the cylinder body 31. The structure is as shown in Figure 2.

[0029] The front end of the cylinder piston 32 is connected to a vacuum cylinder piston rod 33 extending from the cylinder body 31, and a lower rack structure 331 is installed above the vacuum cylinder piston rod 33. The lower rack structure 331 engages with the upper rack structure 241 via a transmission gear 5 fixed to the gun body 1 to transmit power.

[0030] Here, the tooth shapes of the upper rack structure 241, the transmission gear 5, and the lower rack structure 331 are either straight teeth, helical teeth, or arc teeth, and in practice, an appropriate structure can be adopted as needed, or other equivalent structures can also be selected, as long as the upper rack structure 241, the transmission gear 5, and the lower rack structure 331 can achieve meshing transmission.

[0031] At the same time, a separable transmission structure is installed at the front end of the vacuum cylinder piston rod 33, and this transmission structure is transmission-connected with the driving mechanism 7.

[0032] In this embodiment, the transmission structure includes a drive arm 6, which is provided with a first push end 61 and a second push end 62 for two-stage transmission with a drive mechanism 7. The rear end of the drive arm 6 directly forms the second push end 62, and the front end of the drive arm 6 extends downward a certain distance to form the first push end 61, and the height of the first push end 61 is lower than that of the second push end 62.

[0033] The drive arm 6 and the vacuum cylinder piston rod 33 can be molded as a single unit, but in practice, for ease of processing, the drive arm 6 and the vacuum cylinder piston rod 33 are generally installed separately, and the separate drive arm 6 as a whole is fixed to the vacuum cylinder piston rod 33 with multiple screws. However, the drawings in this embodiment only illustrate the separate structure.

[0034] In the high-strength lithium electric nail gun designed with the above structure, its energy storage structure is a composite energy storage structure consisting of a spring compression mechanism 2 and a vacuum cylinder mechanism 3 that are linked together.

[0035] During operation, the driving mechanism 7 operates to move the vacuum cylinder piston rod 33 forward, sequentially carrying out the first and second energy storage stages. Each time the vacuum cylinder piston rod 33 moves forward, it synchronously drives the cylinder piston 32 forward, continuously increasing the vacuum chamber 3a in the cylinder body 31 and performing the vacuum energy storage operation. Meanwhile, the forward movement of the vacuum cylinder piston rod 33 retracts the working piston rod 24 through the meshing transmission of the transmission gear 5, further compressing the spring 22 and performing spring energy storage. The structure is as shown in Figure 3. The vacuum energy storage and spring energy storage simultaneously constitute the power source for the gun needle 4 to drive the nail. When the drive mechanism 7 is separated from the drive arm 6 on the vacuum cylinder piston rod 33, the restoring force of the compression spring 22 becomes the first driving force F1, which quickly ejects the working piston rod 24. At the same time, the vacuum chamber 3a, where energy storage is complete, generates a strong backward suction force F2 on the cylinder piston 32 due to the action of atmospheric pressure. This suction force F2 drives the cylinder piston 32 and the vacuum cylinder piston rod 33 to quickly retreat. Meanwhile, the retreat of the vacuum cylinder piston rod 33 forms a second driving force, which moves the working piston rod 24 forward through the meshing transmission of the transmission gear 5. The first driving force and the second driving force together constitute the driving force for the gun needle. Compared with a single spring energy storage mechanism, this can achieve twice the nail driving strength within the same distance, improving the nail penetration force and nail speed, and meeting the needs of high-intensity nail driving operations.

[0036] Here, the existence of the vacuum cylinder mechanism 3 provides a good buffering effect to the spring compression mechanism 2. After the nailing is completed, the vacuum chamber 3a still exerts an adhesive force on the cylinder piston 32 due to the influence of atmospheric pressure, and the second driving force generated thereby constantly pushes the working piston 24, creating a tendency for it to move forward. The existence of this second driving force effectively offsets the reaction force generated after the spring 22 hits the nailing end point, eliminating the axial and radial vibrations of the spring 22 after the nailing is completed, improving the operating comfort of the nail gun and reducing the fatigue of the operator.

[0037] Furthermore, at the moment nailing is completed, the working piston rod 24 still has a large forward inertia, which generates a strong impact force between the upper rack structure 241 and the transmission teeth of the transmission gear 5. This impact force is likely to cause the teeth of the two to become stuck in mesh (seizure) and may even damage the teeth due to the impact, severely affecting the service life of the working piston rod 24 and the transmission gear 5. To solve this problem, in the present invention, when nailing is completed, the front side of the last tooth 241a of the upper rack structure 241 of the working piston rod 24 is separated from the transmission gear 5. In this case, the inertial force of the working piston rod 24 is not transmitted to the transmission gear 5, fundamentally eliminating the stress impact between them and preventing seizure and tooth damage. However, at the same time, the rear side of the last tooth 241a of the upper rack structure 241 is still in contact with the transmission gear 5, so the axial movement of the working piston rod 24 is limited by the transmission gear 5 and the vacuum cylinder mechanism 3, resulting in excellent vibration buffering and elimination effects.

[0038] In this embodiment, the driving mechanism 7 mainly includes a driving motor 71, a reducer 72, and a crank gear 75. The driving motor 71 is directly connected to the reducer 72, which has a unidirectional output shaft 73 mounted thereon. Transmission teeth 74 are mounted on the output shaft 73, and a crank gear 75 is mounted at the rear of the output shaft 73, which is meshed with and connected to the transmission teeth 74. A first pressing protrusion 751 and a second pressing protrusion 752 are mounted on the upper end surface of the crank gear 75, spaced apart from each other in the circumferential direction. The height of the first pressing protrusion 751 is lower than that of the second pressing protrusion 752. The first pressing protrusion 751 corresponds to the position of the first pressing end 61, and the second pressing protrusion 752 corresponds to the position of the second pressing end 62.

[0039] During operation, when the drive motor 71 rotates the crank gear 75, the first pressing protrusion 751 first abuts against the first pushing end 61, pushing the drive arm 6 and driving the vacuum cylinder piston rod 33 forward, completing the first stage of energy storage. After the first stage of energy storage is completed, the first pressing protrusion 751 and the first pushing end 61 separate, and at the same time, the second pressing protrusion 752 abuts against the second pushing end 62, further pushing the drive arm 6 and continuing to move the vacuum cylinder piston rod 33 forward, completing the second stage of energy storage. This process continues until the second stage of energy storage is completed, at which point the second pressing protrusion 752 separates from the second pushing end 62, and at the same time the first pressing protrusion 751 and the first pushing end 61 also separate, meaning that the drive mechanism 7 is completely released from the vacuum cylinder piston rod 33 and the nailing operation begins.

[0040] In addition, considering that the gun needle 4 in the nail gun is in a reciprocating high-frequency operating state, it is a part that is easily damaged and needs to be replaced frequently during use. Therefore, in the present invention, a mounting seat 242 is installed above the front section of the operating piston rod 24, and a connecting platform is formed on the top of the mounting seat 242, and a connecting hole 2421 is installed on the connecting platform, and the connecting hole 2421 is movably connected to the tail end of the gun needle 4 via a screw 2422. During use, the gun needle 4 can be replaced by simply removing the screw 2422, which is convenient and quick.

[0041] The above is only a preferred embodiment of the present invention, and any simple modification, equivalent modification, or variation made to the above embodiment based on the technical principle of the present invention belongs to the present invention and is within the scope of the technical solution of the present invention.

Claims

1. A high-strength lithium electric nail gun with a composite energy storage structure, comprising a gun body (1), and an energy storage structure is installed at the tail of the gun body (1), The energy storage structure comprises a spring compression mechanism (2) and a vacuum cylinder mechanism (3) that are linked together, the spring compression mechanism (2) mainly including a compression chamber (21), a spring (22), a spring piston (23), and an operating piston rod (24), the spring (22) and the spring piston (23) are mounted in the compression chamber (21), the tail end of the spring (22) is held in contact with the bottom of the compression chamber (21), and the front end of the spring (22) is in contact with the spring piston (23), and in an initial state, the spring (22) is given a pre-compression amount so that the spring piston (23) always tends to move forward; The front end of the spring piston (23) is connected to the operating piston rod (24) which drives the gun needle (4) to operate synchronously, and an upper rack structure (241) is installed at the bottom of the operating piston rod (24). The vacuum cylinder mechanism (3) includes a cylinder body (31) and a cylinder piston (32) installed in the cylinder body (31), the cylinder piston (32) and the rear end of the cylinder body (31) form a completely sealed vacuum chamber (3a), the cylinder piston (32) is initially located at the rear end of the cylinder body (31), the front end of the cylinder piston (32) is connected to a vacuum cylinder piston rod (33) extending from the cylinder body (31), a lower rack structure (331) is installed above the vacuum cylinder piston rod (33), the lower rack structure (331) is engaged with the upper rack structure (241) through a transmission gear (5) fixed to the gun body (1) to transmit power, and at the same time, a transmission structure is installed at the front end of the vacuum cylinder piston rod (33), and the transmission structure is transmission-connected to a driving mechanism (7).

2. 2. The high-strength lithium-ion electric nail gun with a composite energy storage structure according to claim 1, wherein the lower rack structure (331) is engaged with the upper rack structure (241) through the transmission gear (5) to transmit power, and the teeth of the lower rack structure (331), the transmission gear (5) and the upper rack structure (241) are straight teeth, helical teeth or arc teeth.

3. The high-strength lithium electric nail gun with a composite energy storage structure as claimed in claim 1, characterized in that a spring seat (221) for positioning the spring (22) is installed at the tail of the spring compression chamber (21).

4. 2. The high-strength lithium electric nail gun with a composite energy storage structure as claimed in claim 1, wherein when nail driving is completed, the front side of the last tooth (241a) of the upper rack structure (241) of the operating piston rod (24) is separated from the transmission gear (5).

5. The high-strength lithium-ion electric nail gun with a composite energy storage structure according to any one of claims 1 to 4, characterized in that the transmission structure includes a driving arm (6) installed under the front end of the vacuum cylinder piston rod (33), and the driving arm (6) is provided with a first pushing end (61) and a second pushing end (62) which are two-stage transmitted with the driving mechanism (7).

6. 6. The high-strength lithium-ion electric nail gun with a composite energy storage structure as claimed in claim 5, wherein the rear end of the driving arm (6) directly forms the second pushing end (62), and the front end of the driving arm (6) extends downward by a certain distance to form the first pushing end (61), and the height of the first pushing end (61) is lower than that of the second pushing end (62).

7. The high-strength lithium electric nail gun with a composite energy storage structure as claimed in claim 6, characterized in that the driving arm (6) and the vacuum cylinder piston rod (33) are integrally molded.

8. The high-strength lithium electric nail gun with a composite energy storage structure as claimed in claim 6, characterized in that the driving arm (6) and the vacuum cylinder piston rod (33) are installed separately, and the entire driving arm (6) is fixed to the vacuum cylinder piston rod (33) by a number of screws.

9. The driving mechanism (7) mainly includes a driving motor (71), a reducer (72), and a crank gear (75). The driving motor (71) is directly connected to the reducer (72). The reducer (72) is provided with a unidirectionally rotating output shaft (73). The output shaft (73) is provided with transmission teeth (74). The crank gear (75) is provided at the rear of the output shaft (73). The crank gear (75) is meshed with and connected to the transmission teeth (74). A first pressing protrusion (751) and a second pressing protrusion (752) are provided on the upper end surface of the crank gear (75) at a circumferentially spaced interval, the height of the first pressing protrusion (751) is lower than the height of the second pressing protrusion (752), the first pressing protrusion (751) corresponds to the position of the first pressing end (61), and the second pressing protrusion (752) corresponds to the position of the second pressing end (62); 7. The high-strength lithium-ion electric nail gun with a composite energy storage structure as claimed in claim 6, wherein, when the crank gear (75) rotates, the first pressing protrusion (751) first contacts the first pushing end (61), pushing the first pushing end (61) to drive the vacuum cylinder piston rod (33) forward, thereby achieving a first stage of energy storage; and after the first stage of energy storage is completed, the second pressing protrusion (753) contacts the second pushing end (62), pushing the second pushing end (62) to continue moving the vacuum cylinder piston rod (33) forward, thereby achieving a second stage of energy storage.

10. The high-strength lithium electric nail gun with a composite energy storage structure according to any one of claims 1 to 4, characterized in that a mounting seat (242) is installed above the front section of the operating piston rod (24), a connection platform is formed on the top of the mounting seat (242), a connection hole (2421) is installed on the connection platform, and the connection hole (2421) is movably connected to the tail of the gun needle (4) via a screw (2422).

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