A high-strength lithium-electric nail gun with an air-balanced structure

Abstract

The present invention provides a high-strength lithium-ion nail gun with an air-balanced structure. The energy storage unit includes a rear end cap and a first cylinder body and a second cylinder body arranged in parallel above and below the rear end cap. The first cylinder body is provided with a first piston with a sealing ring, and a sealed compressed air chamber is provided between the first piston, the first cylinder body, and the rear end cap. The second cylinder body is provided with a second piston with a sealing ring, and a vacuum chamber is formed between the second piston, the second cylinder body, and the rear end cap. The front end of the first piston is connected to a first rack, which slides within a nozzle fixing seat. The nozzle fixing seat is provided with a rack guide mechanism. The front end of the first rack is connected to a gun needle, and the forward movement of the gun needle contacts the nail at the top of the magazine. The front end of the second piston is connected to a second rack, and the nozzle fixing seat is provided with a transmission gear. The second rack has double-sided meshing teeth on the front and top surfaces, with the faces forming 90-degree angles with each other. The present invention has excellent shock absorption effect and high energy storage strength.

Description

Technical Field

[0001] The present invention relates to a handheld lithium-electric nail gun, in particular to a high-strength lithium-electric nail gun with an air-balance structure. Background Art

[0002] Lithium-ion battery nail guns are handheld nailing tools primarily used in the construction, furniture, and home improvement industries, encompassing both professional and DIY users, and serving a wide customer base. Currently, the main technical approaches to lithium-ion battery nail guns include the gas spring principle and the flywheel energy storage principle. Compared to pneumatic nail guns, the needle, a consumable part, uses a special-shaped, front-drive structure. This requires specialized manufacturing, resulting in a complex and costly structure. Furthermore, the tail end of the special-shaped needle extends into the cylinder of the energy storage structure and is articulated with the piston, requiring removal from the cylinder for replacement. This complicates maintenance and replacement, and the lack of the exhaust and shock absorption features of pneumatic nail guns makes use of them prone to fatigue, a common complaint in the market. Summary of the Invention

[0003] In response to the above problems, the present invention aims to provide a high-strength lithium-electric nail gun with an air-balanced structure, which has the characteristics of high energy storage strength and good shock absorption effect, and the gun needle can be used in conjunction with the gun needle of an air nail gun and is easy to replace.

[0004] The technical solution of the present invention is a high-strength lithium-ion nail gun with an air-balanced structure, which mainly includes a power source part at the bottom, an energy storage part at the rear, a magazine part at the front, and a gun nozzle fixing seat connecting the energy storage part and the magazine part;

[0005] The energy storage unit includes a rear end cover and a first cylinder body and a second cylinder body arranged in parallel above and below the rear end cover. A first piston with a sealing ring is provided in the first cylinder body. A sealed compressed gas chamber is provided between the first piston, the first cylinder body and the rear end cover and is pre-filled with compressed gas.

[0006] A second piston with a sealing ring is provided in the second cylinder body, and a vacuum chamber is formed between the second piston, the second cylinder body and the rear end cover;

[0007] The front end of the first piston is connected to a first rack, which slides in a muzzle fixing seat. A rack guide mechanism is provided in the muzzle fixing seat. The front end of the first rack is connected to a gun needle, which moves forward to contact a nail at the top of the magazine.

[0008] The front end of the second piston is connected to a second rack, and a transmission gear is provided on the gun nozzle fixing seat. The second rack is provided with double-sided meshing teeth on the front and top surfaces, which are divided into surfaces at 90 degrees to each other. The top surface of the transmission gear is meshed with the first rack, and the bottom surface of the transmission gear is meshed with the top surface of the second rack. The front surface of the second rack is provided with meshing teeth to mesh with the power source.

[0009] Preferably, the front side of the last tooth on the first rack is completely separated from the transmission gear when nailing is completed.

[0010] Preferably, the second tooth of the meshing teeth on the second rack is an incomplete tooth structure with a missing top.

[0011] Preferably, the first cylinder body includes an inner and outer double-layer cylinder body structure, which includes a rear end cover, an outer cylinder body and an inner cylinder body, the rear end cover is coaxially provided with an inner circular groove and an outer circular groove, the tail end of the inner cylinder body is sealed and inserted into the inner circular groove, and the tail end of the outer cylinder body is sealed and inserted into the outer circular groove; the inner and outer cylinder bodies are connected to each other as an air storage chamber through an exhaust hole opened on the rear end side wall of the inner cylinder body, and the air storage chamber is pre-filled with compressed gas of a set air pressure, and the first piston is installed in the inner cylinder body.

[0012] Preferably, the second cylinder body is a single-cylinder structure, which is mainly composed of a rear end cover and a cylinder body. The tail end of the cylinder body is radially sealed with the rear end cover, and the second piston is installed in the cylinder body.

[0013] Preferably, the outer side surfaces of the first piston and the second piston are both provided with a plurality of sealing ring installation grooves, and a sealing ring is provided in each sealing ring installation groove.

[0014] Preferably, the front ends of the first cylinder and the second cylinder are both connected to the atmosphere.

[0015] Preferably, the power source includes a motor, a reducer and an output driving gear, the output driving gear is meshedly connected with a first driven gear, the first driven gear is coaxially connected with a second driven gear that rotates synchronously, the second driven gear is provided with a notch portion to form an incomplete tooth structure, the toothed portion of the second driven gear is meshed with the meshing teeth on the front face of the second rack, and the notch portion on the second driven gear is separated from the meshing teeth on the front face of the second rack.

[0016] Preferably, the notched portion of the second driven gear occupies an area of ​​one quarter to one half of the entire tooth circumference.

[0017] Preferably, the gun needle is connected to the front end of the first rack by a screw, which is convenient for disassembly and assembly.

[0018] The present invention can effectively increase the energy of each nail shooting and improve the nail shooting speed by providing an upper and lower energy storage structure of the energy storage part. In addition, the upper and lower layers have a reverse linear structure of the piston and the cylinder body, which greatly reduces axial and radial vibrations and improves user comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 for Figure 1 Side view of

[0021] Figure 3 for Figure 2 Cross-sectional view along AA direction;

[0022] Figure 4 It is a schematic diagram of the structure of some parts in the present invention;

[0023] Figure 5 for Figure 4 Schematic diagram of the structure after removing the first driven gear;

[0024] Among them: 2—power source; 21—motor; 22—reducer; 23—output driving gear; 24—first driven gear; 25—second driven gear; 3—energy storage unit; 31—first cylinder; 312—outer cylinder; 313—inner cylinder; 3131—exhaust hole; 32—second cylinder; 322—cylinder; 33—first piston; 34—second piston; 35—first rack; 36—second rack; 361—engaging teeth; 37—transmission gear; 38—rear end cover; 381—inner groove; 382—outer groove; 4—magnetic clip; 5—nozzle fixing seat; 6—gun needle. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below with reference to the accompanying drawings.

[0026] like Figures 1 to 5 As shown, the present invention provides a high-strength lithium-ion nail gun with an air-balanced structure, which mainly includes a power source part 2 at the bottom, an energy storage part 3 at the rear, a magazine part 4 at the front, and a gun nozzle fixing seat 5 connecting the energy storage part 3 and the magazine part 4;

[0027] The energy storage unit 3 includes a rear end cover 38 and a first cylinder 31 and a second cylinder 32 arranged in parallel on the rear end cover 38. A first piston 33 with a sealing ring is provided in the first cylinder 31. A sealed compressed gas chamber is provided between the first piston 33, the first cylinder 31 and the rear end cover 38, and is pre-filled with compressed gas.

[0028] A second piston 34 with a sealing ring is provided in the second cylinder 32 , and a vacuum chamber is formed between the second piston 34 , the second cylinder 32 and the rear end cover 38 ;

[0029] The front end of the first piston 33 is connected to a first rack 35, which slides in a muzzle fixing seat 5. A rack guide mechanism is provided in the muzzle fixing seat 5. The front end of the first rack 35 is connected to a needle 6. The needle 6 moves forward to contact the top nail of the magazine 4.

[0030] The front end of the second piston 34 is connected to the second rack 36, and a transmission gear 37 is provided on the gun nozzle fixing seat 5. The upper end of the transmission gear 37 is engaged with the first rack 35, and the lower end of the transmission gear 37 is engaged with the second rack 36. The front side of the second rack 36 is provided with meshing teeth 361 connected to the power source part 2.

[0031] Based on the above solution, the front side of the last tooth on the first rack 35 is completely separated from the transmission gear 37 when nailing is completed. The impact force generated when the first piston 33 moves forward to its full position is relatively large. If the first rack 35 and the transmission gear 37 are still in meshing at this time, a collision will occur between the two meshing teeth, which may easily cause the impact of inertia to cause the teeth to break or seize. Because the front side of the last tooth on the first rack 35 is completely separated from the transmission gear 37 at this time, the front side of the tooth is not blocked by the impact force of the forward inertia of the first rack 35, thus effectively protecting the tooth.

[0032] Specifically, the second tooth of the meshing teeth 361 on the second rack 36 is an incomplete tooth structure with a missing top. When the meshing tooth 361 on the second rack 36 meshes with the second driven gear 25, the first tooth in front is engaged first, and the meshing force of the second driven gear 25 is transmitted to the tooth of the second rack 36 in contact with it. At this time, the direction of the force acting on the second rack 36 is constantly changing and can be decomposed into two forces, radial and axial. After the second tooth top of the meshing tooth 361 on the second rack 36 is flattened, it is equivalent to extending the contact time between the first tooth of the meshing tooth 361 and the tooth on the second driven gear 25, so that the root of the first tooth of the meshing tooth 361 also participates in the meshing contact with the tooth on the second driven gear 25. This meshing area makes the direction of the meshing force acting on the second rack 36 closer to the axial direction, and the decomposed force has a greater axial force, so that the meshing tooth 361 on the second rack 36 obtains a greater axial force in the initial state when it first meshes with the second driven gear 25.

[0033] In addition, the first cylinder body 31 comprises an inner and outer double-layer cylinder structure, which includes a rear end cover 38, an outer cylinder body 312 and an inner cylinder body 313. The rear end cover 38 is coaxially provided with an inner circular groove 381 and an outer circular groove 382. The tail end of the inner cylinder body 313 is sealed and inserted into the inner circular groove 381, and the tail end of the outer cylinder body 312 is sealed and inserted into the outer circular groove 382. The exhaust hole 3131 is opened on the rear end side wall of the inner cylinder body 313 to connect the inner and outer cylinder bodies. The first piston 33 is initially positioned at the nailing end when the motor is started, driving the first rack 35 through the transmission mechanism to compress the first piston 33. The first piston 33 moves to a position where it meets the rear end cover, and the compressed gas enters the air storage chamber between the outer cylinder 312 and the inner cylinder 313. The first piston 33 is mounted in the inner cylinder 313 and is dynamically sealed against the inner wall of the inner cylinder 313 via a sealing ring. This allows the inner and outer cylinders to maintain better coaxiality, and the first piston 33 can achieve better movement stability.

[0034] Specifically, the second cylinder body 32 is a single-cylinder structure, which is mainly composed of a rear end cover 38 and a cylinder body 322. The tail end of the cylinder body 322 is radially sealed on the positioning surface of the rear end cover 38. The second piston 34 is installed in the cylinder body 322 and is dynamically sealed with the cylinder body 322.

[0035] In addition, multiple sealing ring installation grooves are provided on the outer side surfaces of the first piston 33 and the second piston 34 , and a sealing ring is provided in each sealing ring installation groove.

[0036] In addition, the front ends of the first cylinder 31 and the second cylinder 32 are both connected to the atmosphere.

[0037] Specifically, the power source part 2 includes a motor 21, a reducer 22 and an output driving gear 23. The output driving gear 23 is meshed with a first driven gear 24. The first driven gear 24 is coaxially connected to a second driven gear 25 that rotates synchronously. The second driven gear 25 is provided with a notch portion to form an incomplete tooth structure. The toothed portion of the second driven gear 25 is meshed with the meshing teeth 361 on the front face of the second rack 36, and the notch portion on the second driven gear 25 is separated from the meshing teeth 361 on the front face of the second rack 36.

[0038] Furthermore, the notched portion of the second driven gear 25 occupies an area from one quarter to one half of the entire tooth circumference.

[0039] Furthermore, the gun needle 6 is connected to the front end of the first rack 35 by a screw, so that the gun needle can be easily disassembled and replaced after being damaged. In the past, the gun needle was directly connected to the piston, which made it difficult to disassemble the gun needle.

[0040] The nail gun of the present invention adopts an upper and lower energy storage structure, wherein the upper layer is provided with a first cylinder 31, a first piston 33, and a first rack 35, and compressed gas is pre-filled between the rear side of the first piston 33 and the first cylinder 31, and the initial position of the first piston 33 is at the nailing end end; the lower layer is provided with a second cylinder 32, a second piston 34, and a second rack 36, and a vacuum chamber is provided between the rear side of the second piston 34 and the second cylinder 32. The second rack 36 is driven forward by the power source part 2, and at the same time, the second rack 36 engages the transmission gear 37 to rotate, driving the first rack 35 to move backward. At this time, the second piston 34 overcomes the attraction of the vacuum chamber and moves forward, so that the vacuum chamber generates a stronger vacuum suction force, and the first piston 33 moves backward, further compressing the compressed air behind the first piston 33, and the compressed air enters the air storage chamber between the outer cylinder 312 and the inner cylinder 313 of the first cylinder 31 through the exhaust hole 3131. The second driven gear 25 is a key component here. When the output driving gear 23 engages to drive the first driven gear 24 to rotate, the second driven gear 25 coaxially connected to the first driven gear 24 rotates synchronously until it reaches the notch of the second driven gear 25. When it rotates to the notch, the second rack 36 loses the power transmitted, and the second piston 34 instantly moves backward and resets under the atmospheric pressure. At the same time, the first piston 33 is instantly pushed forward by the compressed air pressure behind it. At the same time, under the meshing action of the transmission gear 37, the backward force of the second rack 36 is transmitted to the first rack 35, further pushing the first rack 35 forward. It is equivalent to the first rack 35 being subjected to the dual effects of the thrust of its own first piston 33 and the reset thrust of the second piston 34 below, obtaining a strong initial power, instantly pushing out the front needle 5, and shooting the nails on the top layer of the magazine part 4 with a large initial velocity. At the same time, the two 180-degree anti-phase forces of the second cylinder 32 and the first cylinder 31 effectively balance the rebound force generated during nailing, increase nail penetration, and effectively reduce user fatigue.

[0041] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the invention. Any simple modification, equivalent change or modification made to the above embodiment based on the technical principle of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A high-strength lithium-ion nail gun with an air-balanced structure, characterized by: It comprises a power source portion (2) at the bottom, an energy storage portion (3) at the rear, a magazine portion (4) at the front, and a gun nozzle fixing seat (5) connecting the energy storage portion (3) and the magazine portion (4); a. The energy storage unit (3) includes a rear end cover (38) and a first cylinder (31) and a second cylinder (32) arranged in parallel on the rear end cover (38). A first piston (33) with a sealing ring is provided in the first cylinder (31). A sealed compressed gas chamber is provided between the first piston (33), the first cylinder (31) and the rear end cover (38), and is pre-filled with compressed gas. A second piston (34) with a sealing ring is provided in the second cylinder (32). A vacuum chamber is formed between the second piston (34), the second cylinder (32) and the rear end cover (38). b. The front end of the first piston (33) is connected to a first rack (35), the first rack (35) slides in the gun nozzle fixing seat (5), a rack guide mechanism is provided in the gun nozzle fixing seat (5), the front end of the first rack (35) is connected to the gun needle (6), and the forward movement of the gun needle (6) contacts the topmost nail of the magazine portion (4); c. The front end of the second piston (34) is connected to a second rack (36), and a transmission gear (37) is provided on the gun nozzle fixing seat (5). The upper end of the transmission gear (37) is engaged with the first rack (35), and the lower end of the transmission gear (37) is engaged with the second rack (36). The front face of the second rack (36) is provided with meshing teeth (361) connected to the power source (2).

2. The high-strength lithium-ion nail gun with an air-balanced structure according to claim 1, characterized in that: When nailing is completed, the front side of the last tooth on the first rack (35) is completely separated from the transmission gear (37).

3. The high-strength lithium-ion nail gun with an air-balanced structure according to claim 1, characterized in that: The second tooth of the meshing tooth (361) on the second rack (36) is an incomplete tooth structure with a missing top.

4. The high-strength lithium-ion nail gun with an air-balanced structure according to claim 1, characterized in that: The first cylinder body (31) comprises an inner and outer double-layer cylinder body structure, which includes a rear end cover (38), an outer cylinder body (312) and an inner cylinder body (313); an inner circular groove (381) and an outer circular groove (382) are coaxially arranged on the rear end cover (38); the tail end of the inner cylinder body (313) is sealed and inserted into the inner circular groove (381), and the tail end of the outer cylinder body (312) is sealed and inserted into the outer circular groove (382); the inner and outer cylinder bodies are connected to each other as an air storage chamber through an exhaust hole (3131) opened on the rear end side wall of the inner cylinder body (313); the air storage chamber is pre-filled with compressed gas of a set air pressure, and the first piston (33) is installed in the inner cylinder body (313) and sealed by a sealing ring.

5. The high-strength lithium-ion nail gun with an air-balanced structure according to claim 4, characterized in that: The second cylinder body (32) is a single-cylinder structure, which is composed of a rear end cover (38) and a cylinder body (322). The rear end seal of the cylinder body (322) is supported on the end surface of the rear end cover (38), and the second piston (34) is installed in the cylinder body (322).

6. The high-strength lithium-ion nail gun with an air-balanced structure according to claim 1, characterized in that: The outer side surfaces of the first piston (33) and the second piston (34) are both provided with a plurality of sealing ring installation grooves, and a sealing ring is provided in each sealing ring installation groove.

7. The high-strength lithium-ion nail gun with an air-balanced structure according to claim 1, characterized in that: The front ends of the first cylinder (31) and the second cylinder (32) are both in communication with the atmosphere.

8. The high-strength lithium-ion nail gun with an air-balanced structure according to claim 1, characterized in that: The power source part (2) includes a motor (21), a reducer (22) and an output driving gear (23), wherein the output driving gear (23) is meshedly connected with a first driven gear (24), and the first driven gear (24) is coaxially connected with a second driven gear (25) that rotates synchronously, and a notch portion is provided on the second driven gear (25) to form an incomplete tooth structure, and the toothed portion of the second driven gear (25) meshes with the meshing teeth (361) on the front face of the second rack (36), and the notch portion on the second driven gear (25) is separated from the meshing teeth (361) on the front face of the second rack (36).

9. The high-strength lithium-ion nail gun with an air-balanced structure according to claim 8, characterized in that: The notched portion of the second driven gear (25) occupies an area of ​​one quarter to one half of the entire tooth circumference.

10. The high-strength lithium-ion nail gun with an air-balanced structure according to claim 1, characterized in that: The gun needle (6) is connected to the front end of the first rack (35) via a screw.

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