Air spring nailing device

Abstract

The invention relates to the technical field of machine manufacturing, and particularly discloses an air spring nailing device. Comprising a shell, a first air cylinder, a cover body, a working piston and a piston rod connected with the working piston, and the shell, the first air cylinder and the cover body define a first air cavity for storing high-pressure air above the working piston. And the air supply device is arranged on the cover body, and when the working piston works, the air supply device automatically keeps the air pressure in the first air cavity at the preset working air pressure through the movement effect of the working piston. Compared with a traditional air spring nailing device, the air spring nailing device has the advantages that the problems of air pressure reduction and nailing force weakening caused by high-pressure air leakage are effectively solved through the air supplementing device, dependence on external air adding equipment is reduced, the operation efficiency and the use convenience are improved, and the air spring nailing device has high practical value and popularization prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical manufacturing, in particular to an air spring nail driver. Background Art

[0002] An air spring nailer is a tool that uses high-pressure gas to drive a piston rod to drive nails. It is widely used in fields such as construction and furniture manufacturing. Existing air spring nailers typically include a housing, a cylinder, a cover, a piston, and a piston rod connected to the piston. The housing, cylinder, and cover form a gas chamber above the piston to store high-pressure gas. The high-pressure gas pushes the piston to drive the nail, and a reset mechanism (such as a gear mechanism) then resets the piston to prepare for the next nailing cycle.

[0003] However, the air spring nailer in the prior art has some technical problems during use. Due to the repeated reciprocating motions of the piston, the gas in the high-pressure air chamber is prone to leakage, resulting in a gradual decrease in air pressure and a subsequent weakening of the nailing force. In order to restore the nailing force, the operator needs to regularly replenish the high-pressure gas to the air chamber through an external gas filling device. In addition, when repairing or dealing with a stuck nail failure, it is often necessary to completely release the high-pressure gas in the air chamber, and after the repair is completed, the gas needs to be re-replenished through an external gas filling device. This mode of operation not only increases the complexity of use and maintenance, but also relies on special gas filling equipment, affecting the continuity and convenience of the operation.

[0004] Therefore, there is an urgent need for an air spring nailer that can automatically replenish high-pressure gas when the air pressure drops, so as to reduce dependence on external gas filling equipment, improve work efficiency, and simplify maintenance processes. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and propose an air spring nailer; the following technical solutions are adopted:

[0006] An air spring nail driver comprises an outer shell, a first cylinder, a cover body, a working piston and a piston rod connected to the working piston. The outer shell, the first cylinder and the cover body form a first air chamber above the working piston for storing high-pressure gas; the driver also comprises an air supply device arranged on the cover body, the air supply device is used to maintain the air pressure in the first air chamber at the working pressure under the action of the working piston when the working piston is working.

[0007] Preferably, the air supply device comprises:

[0008] An air supply cylinder, an air supply piston that reciprocates in the air supply cylinder, a one-way air supply valve located at the upper end of the air supply cylinder and forming a second air cavity between the air supply piston, an air supply return spring and a one-way valve assembly; wherein,

[0009] When the working piston moves downward under the action of the high pressure in the first air chamber, the air-supply piston moves downward under the action of the air-supply return spring, increasing the volume of the second air chamber and inhaling external air through the one-way air-supply valve; when the working piston returns upward, the air-supply piston is pushed upward, reducing the volume of the second air chamber and compressing the air therein; when the pressure in the second air chamber is higher than that in the first air chamber, the one-way valve assembly opens, allowing compressed air to enter the first air chamber, thereby replenishing the pressure in the first air chamber.

[0010] Preferably, the one-way valve assembly includes an elastic sealing ring; wherein, a conical annular groove is provided on the outer wall of the air-supply cylinder, the bottom of the conical annular groove radially passes through a plurality of air-supply holes, and the elastic sealing ring is arranged in the annular groove and is used to move along the conical surface under the action of the air pressure difference to open and close the air-supply holes.

[0011] Preferably, the axis of the supplementary air cylinder is coaxial with the first cylinder.

[0012] Preferably, the air replenishment return spring is arranged in the air replenishment cylinder, with one end abutting against the upper end surface of the air replenishment piston and the other end abutting against the lower end surface of the air replenishment cylinder opposite to the air replenishment piston.

[0013] Preferably, a convex shoulder is provided on the outer periphery of the upper end of the air-injection cylinder, a connecting plate is provided on the lower end of the air-injection piston, one end of the air-injection return spring abuts against the convex shoulder of the air-injection cylinder, and the other end abuts against the connecting plate at the lower end of the air-injection piston.

[0014] Preferably, the one-way air supply valve includes a valve body, a straight through hole provided in the valve body and extending axially along the valve body, an air guide hole connected to the straight through hole, a pressure ball spring and a sealing ball located in the straight through hole; the valve body is connected to the upper end of the air supply cylinder, and the sealing ball blocks the air guide hole under the action of the pressure ball spring.

[0015] Preferably, the air supply cylinder is provided with an outer peripheral shoulder, and the air supply cylinder is detachably fixed in the cover body through the outer peripheral shoulder and the locking collar.

[0016] Preferably, a rack is provided axially on the outer surface of the piston rod, and the air spring nail driver also includes a power gear meshing with the rack, and a toothless section is provided on the outer periphery of the power gear. When the toothless section is aligned with the rack, the piston rod is released to perform the nailing action, and when the power gear re-engages the rack, the piston rod is driven to reset.

[0017] Preferably, the power gear includes transition teeth and normal teeth, the transition teeth are located at both ends of the tooth-missing segment, and the central angle corresponding to the tooth-missing segment is 40° to 70°.

[0018] Preferably, the transition tooth height is 0.6 to 0.8 times the normal tooth height.

[0019] Preferably, during the piston rod resetting process, the power gear drives the working piston to move upward, and drives the air supply piston to move upward synchronously through the connecting plate.

[0020] Preferably, it also includes an adjustment seat, which is arranged at the lower end of the connecting disk. When the piston rod is reset, the power gear drives the working piston to move upward, and drives the air replenishing piston to move upward synchronously through the connecting disk and the adjusting seat.

[0021] Preferably, the adjustment seat is provided with a height adjustment member for changing the compression stroke of the gas supplement piston in the second gas chamber by adjusting the height of the adjustment seat.

[0022] Preferably, the gas filled in the first air cavity is air or nitrogen, and the volume V2 of the second air cavity and the volume V1 of the first air cavity satisfy 0.005≤V2 / V1≤0.12.

[0023] Preferably, the valve body is threadedly connected to the upper end of the air-supplementing cylinder, so as to change the volume of the second air cavity when the valve body is rotated.

[0024] The beneficial effects of the present invention are as follows: the air replenishing device can automatically replenish high-pressure gas when the air pressure in the first air chamber decreases, thereby avoiding the problem of weakened nailing force due to gas leakage in traditional nail drivers, reducing the frequency of operators using external air replenishing equipment to replenish air regularly, thereby reducing maintenance complexity and dependence on dedicated air replenishing equipment; since the air replenishing device can maintain the working air pressure of the first air chamber in real time, the nail driver can maintain a constant nailing force, ensure the consistency of the nailing effect during operation, and avoid interruptions caused by insufficient air pressure; when dealing with nail jamming failures or performing repairs, traditional nail drivers need to release the high-pressure gas in the first air chamber and re-fill it with air after repair, while the air replenishing device of the present invention can automatically replenish the air pressure in the first air chamber after repair, without the need for external air replenishing equipment; through the automatic air replenishing mechanism, the pressure in the first air chamber is stabilized, avoiding the problem of insufficient nailing force due to reduced air pressure, and reducing the additional wear of the piston and related components due to unstable pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0026] Figure 1 : This is a structural diagram of a common air spring nailer on the market;

[0027] Figure 2 : is a diagram showing the initial position of the air spring nail driver provided by an embodiment of the present invention;

[0028] Figure 3 : is a diagram of the nailing state of the air spring nail driver provided by an embodiment of the present invention;

[0029] Figure 4 : is an air intake diagram of the air replenishing device of the air spring nailer provided by an embodiment of the present invention;

[0030] Figure 5 : is a piston reset diagram of the air spring nail driver provided by an embodiment of the present invention;

[0031] Figure 6 : is a diagram of the air filling device of the air spring nailer provided by an embodiment of the present invention;

[0032] Figure 7 : is a structural diagram of the air filling cylinder of the air spring nail driver provided by an embodiment of the present invention;

[0033] Figure 8 : is a structural diagram of the air-supply piston of the air spring nail driver provided by an embodiment of the present invention;

[0034] Figure 9 : is a valve body structure diagram of the air spring nail driver provided by an embodiment of the present invention;

[0035] Figure 10 : It is an air-inflating piston connecting plate of an air spring nail driver provided by an embodiment of the present invention.

[0036] Icons: 1-air spring nailer; 10-housing; 20-first cylinder; 30-cover; 40-working piston; 50-piston rod; 51-rack; 60-air supply cylinder; 61-conical annular groove; 62-air supply hole; 63-boss; 70-air supply piston; 71-connecting plate; 80-valve body; 81-straight through hole; 82-air guide hole; 83-sealing bead; 84-pressure bead spring; 90-air supply return spring; 100-elastic sealing ring; 110-power gear; 111-toothless section; 112-transition tooth; 120-adjustment seat; 121-height adjustment piece; 130-locking clamp. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly introduced below in conjunction with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structures of the drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0039] The technical solutions of the present invention are described in detail below through specific examples. It should be noted that the following examples are merely illustrative and do not limit the scope of protection of the present invention. Those skilled in the art may make appropriate adjustments to the parameters, materials, or structures in the examples without departing from the scope of the present invention, and such adjustments shall be considered part of the scope of protection of the present invention.

[0040] Example 1

[0041] See also Figures 1 to 10 , an air spring nailer 1 is provided in this embodiment, which aims to solve the problem of reduced air pressure and weakened nailing force caused by high-pressure gas leakage in traditional air spring nailers 1 by setting an air replenishing device, while reducing dependence on external air filling equipment, thereby improving operating efficiency and ease of use.

[0042] The air spring nailer 1 of this embodiment includes a housing 10, a first cylinder 20, a cover 30, a working piston 40, and a piston rod 50 connected to the working piston 40. It is clear that the housing 10 can be made of high-strength aluminum alloy material, which has good corrosion resistance and mechanical strength, can effectively protect the internal components and withstand the impact force generated during the nailing process. The first cylinder 20 is a cylindrical structure and can be made of stainless steel. Its inner wall is precisely polished to reduce the friction resistance during the movement of the working piston 40. The cover 30 can be fastened to the upper end of the first cylinder 20 by bolts or threads to form a sealing structure. The housing 10, the first cylinder 20 and the cover 30 together form a first air chamber above the working piston 40 to store high-pressure gas. The first air chamber can be filled with high-pressure nitrogen or air, such as an initial pressure set to 15 bar, which is used to drive the working piston 40 to complete the nailing action. The working piston 40 is a disc-shaped structure made of high-strength engineering plastic. A sealing ring is embedded around its periphery to ensure a good seal with the inner wall of the first cylinder 20 and prevent leakage of high-pressure gas. One end of the piston rod 50 is fixedly connected to the working piston 40, and the other end is used to directly act on the nail to complete the nailing action. The piston rod 50 can be made of high-strength carbon steel.

[0043] In this embodiment, the cover body 30 is provided with an air supply device for automatically maintaining the air pressure in the first air chamber at the working pressure (i.e., 15 bar) through the movement of the working piston 40 when the working piston 40 is in operation. Preferably, the air supply device includes an air supply cylinder 60, an air supply piston 70, a one-way air supply valve, an air supply return spring 90, and a one-way valve assembly.

[0044] In a specific implementation, the air supply cylinder 60 can be a small cylindrical structure made of aluminum alloy (or high-strength plastic) to ensure sufficient strength and lightness. The air supply cylinder 60 is fixedly installed at the center of the cover body 30 and is coaxially arranged with the first cylinder 20 to ensure the symmetry and stability of the structure. The air supply piston 70 is arranged inside the air supply cylinder 60 and is made of polytetrafluoroethylene material with good wear resistance and self-lubricating properties. The air supply piston 70 can reciprocate up and down in the air supply cylinder 60, and its outer periphery is also embedded with a sealing ring to ensure sealing with the inner wall of the air supply cylinder 60.

[0045] A one-way air supply valve is located at the upper end of the air supply cylinder 60. This valve comprises a valve body 80, a through hole 81 extending axially from the valve body 80, an air guide hole 82 communicating with the through hole 81, and a sealing bead 83 located within the through hole 81. The valve body 80 can be made of brass. The sealing bead 83 is a steel ball that, under the action of a ball-pressing spring 84, blocks the air guide hole 82, ensuring that air can only flow into the interior of the air supply cylinder 60 in one direction. A second air chamber is formed between the one-way air supply valve and the air supply piston 70. The volume of this second air chamber changes with the upward and downward movement of the air supply piston 70.

[0046] The air return spring 90 is a compression spring made of high-strength spring steel. It is mounted on the exterior of the air return cylinder 60, with one end resting against the shoulder 63 at the lower end of the air return cylinder 60 and the other end resting against the connecting plate 71 at the lower end of the air return piston 70. The connecting plate 71 is a circular, thin plate structure that is threadedly secured to the air return piston 70. The function of the air return spring 90 is to provide downward thrust when the working piston 40 moves downward, causing the air return piston 70 to follow its downward motion.

[0047] The one-way valve assembly is located on the outer wall of the air supply cylinder 60 and is used to control the gas flow between the second air cavity and the first air cavity. The one-way valve assembly includes an elastic sealing ring 100, specifically a conical annular groove 61 and an elastic sealing ring 100. The outer wall of the air supply cylinder 60 is processed with a conical annular groove 61 with a conical angle of 5°, and four air supply holes 62 are radially passed through the bottom of the groove. The elastic sealing ring 100 is an O-ring, which can be made of nitrile rubber material and is arranged in the conical annular groove 61. When the pressure in the second air cavity is higher than that in the first air cavity, the O-ring moves along the conical surface under the action of the air pressure difference, opens the air supply hole 62, and allows compressed air to flow into the first air cavity; when the pressure is balanced, the O-ring resets and closes the air supply hole 62 to prevent the gas from flowing back to the outside.

[0048] The working process of the air spring nailer 1 of this embodiment is divided into four stages: initial state, nailing action, air suction process and air replenishment process. Figures 1 to 10 The corresponding structure is as follows:

[0049] In the initial state, the first air chamber is filled with high-pressure air or nitrogen, with the reference pressure set at 15 bar. The working piston 40 is positioned above the first cylinder 20, contacting the lower connection plate 71 of the air supply piston 70. At this point, the air supply piston 70 is pushed to the upper end of the air supply cylinder 60 by the working piston 40, and the volume of the second air chamber is minimized, approximately 5 mL. The air supply return spring 90 is compressed, the one-way air supply valve is closed, and the O-ring seals the air supply hole 62, eliminating air flow between the second and first air chambers. When the operator pulls the trigger, the power gear 110 rotates a certain angle, aligning its missing teeth with the piston rod 50, disengaging the piston rod 50. Under the influence of the high-pressure air or nitrogen in the first air chamber, the working piston 40 rapidly moves downward, driving the piston rod 50 downward to impact the nail, completing the nailing action. As the working piston 40 moves downward, the air supply piston 70 loses its support from the working piston 40 and moves downward under the elastic force of the air supply return spring 90. The downward movement of the air supply piston 70 increases the volume of the second air chamber from 5 mL to 75 mL (the second air chamber's maximum volume). This increase in volume causes the pressure within the second air chamber to decrease, creating a negative pressure. At this point, the one-way air supply valve opens, allowing external air to be drawn into the second air chamber through the through-hole 81 and the air guide hole 82 until the air supply piston 70 reaches the lower end of the air supply cylinder 60. At this point, the second air chamber is filled with atmospheric pressure air (approximately 1 bar), and the one-way air supply valve closes. After the nailing operation is completed, the power gear 110 rotates again, meshing with the piston rod 50 and driving the working piston 40 upward. During its upward movement, the working piston 40 contacts the connecting plate 71 at the lower end of the air supply piston 70, pushing the air supply piston 70 upward. The upward movement of the air supply piston 70 reduces the volume of the second air chamber from 75 mL to 5 mL. This compresses the air within the second air chamber, increasing its pressure (according to the ideal gas state equation P1V1=P2V2, ignoring temperature changes, the pressure can rise to approximately 15 bar). At this time, if there is a leak in the gas of the first air chamber, the pressure drops below 15 bar, for example, 14.8 bar. In this way, the pressure in the second air chamber (15 bar) is higher than the pressure in the first air chamber (14.8 bar). Under the action of the air pressure difference, the O-ring moves along the conical annular groove 61 and opens the air supply hole 62. The high-pressure air in the second air chamber flows into the first air chamber through the air supply hole 62. At this time, the working piston 40 and the air supply piston 70 return to their initial positions, ready for the next nailing action. Repeat the above nailing action to gradually restore the pressure of the first air chamber to 15 bar. When the pressure of the first air chamber and the second air chamber is balanced, the O-ring is reset, the air supply hole 62 is closed, and the air supply process is completed.

[0050] The air replenishment device automatically replenishes the gas pressure in the first air chamber with each reciprocating motion of the working piston 40. After multiple nailing cycles, even if the first air chamber experiences minor gas leaks due to a poor seal or other reasons, the air replenishment device can replenish the pressure in the first air chamber with compressed air from the second air chamber, maintaining it at a constant working pressure of 15 bar, thereby ensuring consistent nailing force. Conventional air spring nailers 1 require regular refilling of high-pressure gas with an external refilling device. However, the automatic refilling function of the air replenishment device in this embodiment significantly reduces this reliance on external refilling devices. Even if the high-pressure gas in the first air chamber is released after repairs or troubleshooting a stuck nail, the air replenishment device automatically restores the pressure in the first air chamber to the working pressure after reassembly through repeated reciprocating motions of the working piston 40, eliminating the need for additional refilling. Because the pressure in the first air chamber is maintained at the working pressure in real time, the nailer maintains a constant nailing force, avoiding issues such as poor nailing results or interruptions due to insufficient air pressure. The operator no longer needs to frequently stop to refill air, significantly improving operational continuity and efficiency. The modular design of the air supply device (secured to the cover 30 via the peripheral shoulder 63 and the locking collar 130) facilitates assembly and disassembly and maintenance. To replace vulnerable parts such as the air supply piston 70 or O-ring, simply remove the locking collar 130 to access the air supply cylinder 60, eliminating the need for extensive disassembly of the entire nailer and reducing maintenance complexity.

[0051] Among them, it is clear that the materials of the air-replenishing piston 70 and the O-ring must have good wear resistance and high-pressure resistance to ensure the sealing effect during long-term use. Check the wear of the O-ring regularly and replace it when necessary. The maximum volume of the second air chamber and the spring constant of the air-replenishing reset spring 90 must be precisely designed according to the working air pressure of the first air chamber to ensure that the pressure of the second air chamber after compression can effectively supplement the pressure of the first air chamber, while avoiding excessive deformation of the sealing ring due to excessive pressure. The coaxial installation of the air-replenishing cylinder 60 and the first cylinder 20 must ensure high precision to avoid uneven movement of the air-replenishing piston 70 or sealing failure due to eccentricity.

[0052] This embodiment provides an air spring nail driver 1. By providing an air replenishment device on the cover 30, an automatic air replenishment function is achieved, solving the problem of reduced air pressure and reduced nailing force caused by gas leakage in conventional nail drivers. The air replenishment device, through the coordinated operation of the air replenishment cylinder 60, the air replenishment piston 70, the one-way air replenishment valve, the air replenishment return spring 90, and the one-way valve assembly, automatically replenishes the pressure in the first air chamber with each reciprocating motion of the working piston 40, maintaining its working air pressure stable. This design not only improves the operating efficiency and ease of use of the nail driver, but also simplifies the maintenance process and reduces dependence on external air filling equipment, thus having high practical value and promotion prospects.

[0053] Example 2

[0054] Based on Example 1, this embodiment further optimizes the air supply device of the air spring nail driver 1, and specifically improves the installation method of the one-way valve assembly and the air supply cylinder 60 to improve the air supply efficiency and structural stability.

[0055] In Example 1, the one-way valve assembly already includes an elastic sealing ring 100. This embodiment further clarifies and optimizes its structure. The outer wall of the air supply cylinder 60 is provided with a conical annular groove 61, with a conical angle of 5° and a groove depth of 2 mm. Four air supply holes 62 are radially extending through the bottom of the groove. Each air supply hole 62 has a diameter of 1 mm and is evenly distributed across the bottom of the annular groove to ensure uniform gas flow. The elastic sealing ring 100 is an O-ring made of high-pressure-resistant nitrile rubber with a cross-sectional diameter of 1.5 mm. The O-ring is positioned within the conical annular groove 61, with an inner diameter slightly smaller than the diameter of the bottom of the annular groove to ensure a seal against the air supply holes 62 in the initial state. When the pressure in the second air chamber is higher than that in the first air chamber, the O-ring moves upward along the conical surface due to the pressure differential, exposing the air supply holes 62 and allowing compressed air to flow into the first air chamber. When the pressures are balanced, the O-ring returns to its original position due to its elasticity and the slope of the conical surface, resealing the air supply holes 62 and preventing gas backflow. This design improves the opening and closing sensitivity and sealing reliability of the one-way valve assembly, and reduces the risk of air leakage caused by deformation or wear of the sealing ring.

[0056] In order to further improve the stability of the structure and the smoothness of the movement of the air-supply piston 70, this embodiment clearly stipulates that the axis of the air-supply cylinder 60 is coaxial with the first cylinder 20. The air-supply cylinder 60 is fixed at the center of the cover body 30 through precision machining, and the deviation between its axis and the axis of the first cylinder 20 is controlled within 0.02 mm. The coaxial setting ensures the mechanical balance of the working piston 40 and the air-supply piston 70 during movement, and avoids eccentric movement or jamming of the air-supply piston 70 due to axis deviation. In addition, the coaxial design also helps to reduce the friction between the air-supply piston 70 and the inner wall of the air-supply cylinder 60, prolong the service life of the sealing ring, and at the same time make the structure of the entire nailer more compact and symmetrical, thereby improving the overall mechanical performance.

[0057] The optimized one-way valve assembly, through the coordination of the conical annular groove 61 and the O-ring, makes the opening and closing of the air supply hole 62 more sensitive. When the pressure in the second air cavity is higher than that in the first air cavity, the O-ring can quickly move along the conical surface, opening the air supply hole 62 and ensuring that compressed air quickly flows into the first air cavity. After the pressure is balanced, the O-ring quickly resets to prevent gas backflow. Compared with Example 1, the one-way valve assembly of this embodiment improves the gas transmission efficiency during each air supply process, making the pressure in the first air cavity recover faster and further enhancing the stability of the nailing force.

[0058] The coaxial arrangement of the air supply cylinder 60 and the first cylinder 20 reduces mechanical stress concentration caused by axis misalignment. The working piston 40 and the air supply piston 70 maintain a more consistent trajectory, minimizing eccentric wear of the air supply piston 70 during movement within the air supply cylinder 60 and ensuring sealing performance during long-term use. Furthermore, the coaxial design provides a more uniform center of gravity distribution throughout the nailer, minimizing the impact of vibration and impact on the air supply mechanism during the nailing process, thereby enhancing the durability and reliability of the overall structure.

[0059] The cone angle and surface roughness of the conical annular groove 61 need to be strictly controlled to ensure smooth movement and good sealing of the O-ring. The edge of the air supply hole 62 needs to be chamfered to prevent burrs from damaging the O-ring. The coaxial installation of the air supply cylinder 60 and the first cylinder 20 requires the use of a high-precision fixture for positioning. After installation, the axis deviation should be tested to ensure that the deviation is within the allowable range to avoid affecting the smooth movement of the air supply piston 70. Based on Example 1, this embodiment further improves the air supply efficiency and structural stability of the air spring nailer 1 by optimizing the annular sealing structure of the one-way valve assembly and clarifying the coaxial setting of the air supply cylinder 60 and the first cylinder 20. The combination of the conical annular groove 61 and the O-ring makes the air supply process more efficient and reliable, and the coaxial design enhances the balance and durability of the mechanical structure, providing a guarantee for the long-term stable operation of the nailer.

[0060] Example 3

[0061] Based on Examples 1 and 2, this embodiment further optimizes the installation position and support method of the air replenishment return spring 90 and proposes two different preferred solutions to enhance the stability of the air replenishment device and the motion control of the air replenishment piston 70.

[0062] Solution 1: The air-replenishing reset spring 90 is arranged in the air-replenishing cylinder 60, with one end abutting against the upper end surface of the air-replenishing piston 70, and the other end abutting against the lower end surface of the air-replenishing cylinder 60 on the side opposite to the air-replenishing piston 70; in this solution, the air-replenishing reset spring 90 is placed inside the air-replenishing cylinder 60. The air-replenishing reset spring 90 is made of high-strength spring steel, with one end of the spring directly abutting against the upper end surface of the air-replenishing piston 70, and the other end abutting against the inner wall of the air-replenishing cylinder 60. In a specific implementation, the top of the inner cavity of the air-replenishing cylinder 60 is connected to the one-way air-replenishing valve, and the other end of the air-replenishing reset spring 90 can abut against the lower end surface of the valve body 80 of the one-way air-replenishing valve. The upper end surface of the air-replenishing piston 70 is smoothed to increase the contact area with the spring, ensure uniform force, and achieve high space utilization inside the air-replenishing cylinder 60.

[0063] When the working piston 40 moves downward, the air-replenishing piston 70 loses its support and moves downward under the elastic force of the air-replenishing return spring 90, increasing the volume of the second air chamber and inhaling external air. The spring is placed inside the cylinder to shorten its force path, reduce external force interference, and improve the stability of the movement of the air-replenishing piston 70. Compared with Example 2, the internally installed spring reduces the external space occupied, making the overall structure of the air-replenishing device more compact. The contact between the air-replenishing return spring 90 and the lower end face of the valve body 80 of the one-way air-replenishing valve ensures the effective transmission of thrust, the downward movement speed of the air-replenishing piston 70 is uniform, the change in the volume of the second air chamber is more accurately controlled, and the suction efficiency is improved. In addition, the internal spring is less affected by the external environment, and its corrosion resistance and service life are extended. Among them, the free length and compression amount of the spring need to be calculated to ensure that the appropriate preload is maintained within the full stroke range of the air-replenishing piston 70 to avoid deformation of the spring due to over-compression.

[0064] Option 2: One end of the air-replenishing return spring 90 rests against the boss 63 of the air-replenishing cylinder 60, and the other end rests against the connecting plate 71 at the lower end of the air-replenishing piston 70. In this option, the air-replenishing return spring 90 is still placed outside the air-replenishing cylinder 60, but its support method has been adjusted. A boss 63 with a width of 4mm and a height of 2mm is machined on the outer wall of the air-replenishing cylinder 60, serving as the upper support point of the spring. The air-replenishing return spring 90 uses the same material and spring constant (12N / mm) as Option 1, but the length has been slightly adjusted to 32mm to accommodate the new installation position. The upper end of the spring rests against the boss 63 of the air-replenishing cylinder 60, and the lower end rests against the connecting plate 71 at the lower end of the air-replenishing piston 70. The connecting plate 71 is a circular thin plate with a diameter of 25mm, fixed to the air-replenishing piston 70 by a threaded connection. The surface flatness is controlled within 0.01mm to ensure good contact with the spring. When the working piston 40 moves downward, the air-supply piston 70 moves downward under the thrust of the spring, the volume of the second air chamber increases and external air is sucked in. The boss 63 serves as the upper support point of the spring, providing a stable force basis, and the cooperation with the connecting plate 71 enables the thrust of the spring to act directly on the lower end of the air-supply piston 70. Compared with the external spring installation method of Example 2, this solution reduces the possibility of lateral deviation of the spring through the precise positioning of the boss 63 and the connecting plate 71. The movement trajectory of the air-supply piston 70 is smoother, and the air flow fluctuation during the inhalation process is reduced by about 8%. In addition, the design of the boss 63 facilitates the rapid installation and replacement of the spring, and the maintenance convenience is improved. Among them, the surface of the boss 63 of the air-supply cylinder 60 needs to be polished to reduce the friction between the spring and the boss 63. The threaded connection between the connecting plate 71 and the air-supply piston 70 needs to be fixed with a high-strength nut to ensure that it does not loosen during high-frequency movement.

[0065] This embodiment optimizes the installation of the air-compensating return spring 90 through two preferred solutions. Solution 1 places the spring inside the air-compensating cylinder 60, achieving a more compact structure and improved motion stability. Solution 2, through the coordination of the boss 63 and the connecting plate 71, enhances the precise transmission of spring thrust and facilitates maintenance. Both solutions improve the performance of the air-compensating device over that of Example 2, providing diverse options for the long-term stable operation of the air spring nailer 1.

[0066] Example 4

[0067] Based on Example 1 and Example 2, this embodiment further optimizes the structural design of the one-way air supply valve to improve the sealing performance and one-way flow efficiency of the air supply device of the air spring nailer 1 during the air intake process.

[0068] In this embodiment, the structure of the one-way air supply valve has been refined and optimized. The one-way air supply valve includes a valve body 80, a through hole 81 extending axially from the valve body 80, an air guide hole 82 connected to the through hole 81, and a sealing bead 83 located within the through hole 81. The valve body 80 is made of corrosion-resistant brass, and the surface is finely polished to ensure airtightness. The through hole 81 is drilled along the axis of the valve body 80 and is connected to the air passage at the upper end of the air supply cylinder 60. The air guide hole 82 intersects the through hole 81 at right angles and is drilled into the side wall of the valve body 80 to ensure smooth connection with the external air passage. The sealing bead 83 is a steel ball to ensure wear resistance and sealing effect. The sealing bead 83 is placed in the through hole 81 and is provided with an upward preload force by a pressure bead spring 84. The pressure bead spring 84 is a small helical compression spring made of stainless steel with a free length of 8 mm and is installed at the bottom of the through hole 81. One end of the spring rests against the support step at the bottom of through-hole 81, while the other end supports sealing bead 83. This allows the spring to tightly seal air guide hole 82 in the absence of external air pressure, preventing gas from flowing back to the outside. The support step is a 4.2mm diameter annular protrusion, formed through precision machining, ensuring the stable positioning of the spring and sealing bead 83.

[0069] The optimized design of the one-way air supply valve significantly improves the air intake efficiency and sealing reliability of the air supply device. The operating process is as follows: When the working piston 40 moves downward, the air supply piston 70 moves downward under the action of the air supply return spring 90, increasing the volume of the second air chamber and creating negative pressure. At this point, external air enters the through-hole 81 through the air guide hole 82. Due to the negative pressure in the second air chamber, the sealing bead 83, driven by the air flow, overcomes the preload of the pressure bead spring 84 and moves downward. The air guide hole 82 is opened, allowing external air to flow smoothly into the second air chamber. Compared to the one-way valve design of Example 2, the optimized sealing bead 83 and air guide hole 82 structure reduces air flow resistance, allowing the second air chamber to be filled with sufficient air quickly. When the working piston 40 returns upward, the air supply piston 70 is pushed upward, reducing the volume of the second air chamber and increasing the internal pressure. When the pressure in the second air chamber exceeds the external atmospheric pressure, the sealing bead 83, driven by the pressure bead spring 84, quickly moves upward, resealing the air guide hole 82 and preventing compressed air from flowing back to the outside. This one-way sealing mechanism ensures complete compression of the air in the second air chamber, providing a reliable pressure source for the subsequent air replenishment process. Compared with Example 2, the optimized valve body 80 structure reduces the wear of the sealing bead 83 and extends the service life of the one-way air replenishment valve by approximately 15%.

[0070] In synergy with Example 2, combined with the optimized conical annular groove 61 and O-ring in Example 2, the precise sealing of the one-way air supply valve further enhances the overall performance of the air supply device. The rapid response of the sealing bead 83 and the rational design of the air guide hole 82 effectively cooperate with the opening and closing action of the elastic sealing ring 100, ensuring that the high-pressure air in the second air chamber is quickly replenished to the first air chamber when the pressure difference reaches the set value, thereby improving the constant pressure stability of the nailer. Specifically, the drilling of the through hole 81 and the air guide hole 82 must be completed using a high-precision CNC machine tool to ensure smooth airflow and stable movement of the sealing bead 83. The preload of the bead pressing spring 84 must be calibrated according to the negative pressure range of the second air chamber to ensure that the sealing bead 83 is easily lifted by the airflow during inhalation and quickly reset during closing. Optimization can be achieved by adjusting the spring length or replacing springs with different constants. Regularly inspect the surface wear of the sealing bead 83. If obvious scratches or deformation are found, replace it promptly to avoid affecting the sealing performance of the one-way valve.

[0071] This embodiment optimizes the structure of the one-way air supply valve, employing a combined design of a valve body 80, a through-hole 81, an air guide hole 82, and a sealing bead 83. This design, driven by a pressure bead spring 84, achieves efficient one-way air suction. Compared to Example 2, this design improves air suction efficiency and sealing reliability. The synergistic effect of the conical annular groove 61 and the coaxial arrangement further enhances the performance of the air supply device, providing the air spring nailer 1 with more stable pressure support and a longer service life.

[0072] Example 5

[0073] This embodiment further optimizes the fixing method of the air supply cylinder 60 based on the embodiment 2 to enhance the modular design and maintenance convenience of the air spring nailer 1. The structure of the air supply cylinder 60 detachably fixed to the locking collar 130 via the peripheral boss 63 and its working effect are described in detail.

[0074] In this embodiment, the fixing method of the air supply cylinder 60 is improved. The air supply cylinder 60 is made of aluminum alloy (or high-strength plastic) material, and the outer wall of the air supply cylinder 60 is processed with a peripheral boss 63, and the boss 63 is located on the upper part of the cylinder. The surface of the boss 63 is polished to ensure that the contact surface with the cover body 30 is flat. A mounting hole is processed in the center position of the cover body 30, and the inner wall of the hole is provided with a groove for fixing the locking clamp 130. The locking clamp 130 is a C-shaped elastic clamp made of high-strength spring steel. The inner diameter of the locking clamp 130 is slightly smaller than the outer diameter of the air supply cylinder 60. During installation, the clamp can be compressed by a special tool and then embedded in the inner groove of the cover body 30. The air supply cylinder 60 is detachably fixed to the locking clamp 130 through the peripheral boss 63. The specific installation process is as follows: insert the air supply cylinder 60 into the mounting hole of the cover body 30 until the outer peripheral shoulder 63 abuts the support step of the inner hole of the cover body 30; then compress the locking collar 130 and insert it into the inner groove of the cover body 30. After the collar recovers its elasticity, it tightly clamps the outer peripheral shoulder 63 of the air supply cylinder 60, firmly fixing it to the cover body 30. For disassembly, simply use collar pliers to remove the locking collar 130, and the air supply cylinder 60 can be easily pulled out of the cover body 30.

[0075] The fixing method of the peripheral boss 63 and the locking collar 130 makes the installation and disassembly process of the air supply cylinder 60 extremely simple. Compared with the traditional bolt fixing method, this design does not require the use of screws or nuts, and only simple tools are needed to complete the disassembly and assembly. When repairing or replacing the internal parts of the air supply cylinder 60 (such as the air supply piston 70 or the O-ring), the operator can quickly remove the air supply cylinder 60 and reinstall it after completing the maintenance, which significantly improves the maintenance efficiency. The cooperation between the peripheral boss 63 and the locking collar 130 provides a stable fixing force. The elastic pre-tightening force of the locking collar 130 ensures that the air supply cylinder 60 will not loosen under the high-frequency vibration and impact of the nailer. At the same time, the supporting effect of the peripheral boss 63 makes the contact between the air supply cylinder 60 and the cover body 30 closer, reducing the micro-wear caused by the installation gap. Compared with Example 2, the fixing reliability of this design in long-term use is improved by about 20%.

[0076] Combined with the coaxial arrangement of the air supply cylinder 60 and the first cylinder 20 in Example 2, the modular fixing method further enhances the overall stability of the structure. The coaxial arrangement ensures a smooth motion trajectory of the air supply piston 70, while the fixing method of the peripheral boss 63 and the locking collar 130 ensures the positional accuracy of the air supply cylinder 60 under high-intensity working conditions, reducing eccentricity or vibration problems caused by loose fixation. Among them, the depth and width of the clamping groove of the locking collar 130 need to be precisely controlled to ensure that the collar can be firmly fixed after installation and easy to disassemble. The edges of the clamping groove need to be chamfered to prevent sharp edges from damaging the collar. The thickness of the peripheral boss 63 needs to be designed according to the weight of the air supply cylinder 60 and the impact load of the nail driver to ensure that it will not deform or break during long-term use. Regularly check the surface of the boss 63 for signs of wear. A high-pressure resistant rubber sealing gasket needs to be installed at the interface where the air supply cylinder 60 contacts the cover body 30 to prevent high-pressure gas from leaking from the mounting hole. For example, the thickness of the sealing gasket is 1 mm and the material is nitrile rubber.

[0077] This embodiment optimizes the installation structure of the air supply cylinder 60 by utilizing a removable fixing method using the peripheral boss 63 and the locking collar 130, achieving modular assembly and disassembly convenience and structural stability. Compared to Example 2, this design significantly improves maintenance efficiency while ensuring the reliable fixing of the air supply cylinder 60 in high-intensity working environments, providing strong support for the long-term use and rapid maintenance of the air spring nailer 1.

[0078] Example 6

[0079] Based on the above embodiments, this embodiment further optimizes the power transmission and air supply control mechanism of the air spring nailer 1. By introducing the rack 51, the power gear 110 and related components, the reset accuracy of the piston rod 50 and the adjustment flexibility of the air supply device are enhanced.

[0080] The outer surface of the piston rod 50 is machined with a rack 51 along the axial direction. It is made of high-strength carbon steel and the surface is carburized and heat-treated to improve wear resistance. The air spring nailer 1 is newly equipped with a power gear 110, which meshes with the rack 51. The module is consistent with the rack 51 and the number of teeth is 25. A toothless section 111 is provided on the outer periphery of the power gear 110. The center angle corresponding to the toothless section 111 is designed to be 50°. The transition teeth 112 at both ends of the toothless section 111 are 0.7 times the normal tooth height. The transition teeth 112 are designed to be progressive to reduce the impact of meshing. The power gear 110 is connected to the trigger mechanism via a shaft and is rotated by manual or electric drive. The center angle range of the toothless section 111 is set to 40° to 70°. In this embodiment, 50° is selected as the optimal value to ensure that the piston rod 50 has sufficient downward movement space to complete the nailing action when released. The height of the transition tooth 112 is 0.6 to 0.8 times the normal tooth height (0.7 times in this example). The gradual tooth surface design reduces the impact force when the power gear 110 and the rack 51 re-engage, thereby extending the service life of the rack 51 and the gear.

[0081] During the return process of the piston rod 50, the power gear 110 rotates, causing its teeth to re-engage with the rack 51, driving the working piston 40 upward. The working piston 40 is connected to the air supply piston 70 via a lower connecting plate 71. This connecting plate 71 is a steel disc that ensures uniform force transmission. The rotation of the power gear 110 causes the working piston 40 to move upward, simultaneously driving the air supply piston 70 upward via the connecting plate 71, compressing the second air chamber to achieve the air supply function.

[0082] This embodiment includes a new adjustment seat 120, mounted between the connecting plate 71 and the gas injection piston 70. The adjustment seat 120 is a cylindrical, height-adjustable structure made of aluminum alloy (or high-strength plastic). The adjustment seat 120 is threadedly connected to the connecting plate 71 and has a height adjustment member 121 at its top, which is a fine-tuning nut. Adjusting the height of the adjustment seat 120 changes the compression stroke of the gas injection piston 70 within the second air chamber, thereby precisely controlling the compression ratio and gas injection pressure of the second air chamber.

[0083] The first air chamber is filled with air or nitrogen at an initial pressure of 15 bar. The second air chamber volume V2 is designed to be 75 mL, which satisfies the ratio requirement of 0.005 ≤ V2 / V1 ≤ 0.12 (in this example, V2 / V1 = 0.094) relative to the first air chamber volume V1 (800 mL), ensuring that the air replenishment device can effectively replenish the pressure of the first air chamber.

[0084] The toothless section 111 of the power gear 110 cooperates with the rack 51 to release and reset the piston rod 50. When the toothless section 111 is aligned with the rack 51, the piston rod 50 freely moves downward under the high pressure of the first air chamber to complete nailing. When the power gear 110 re-engages, the load is gradually absorbed by the transition teeth 112, reducing the impact force by approximately 30% and effectively reducing the wear rate of the rack 51 and gear.

[0085] The working piston 40 drives the air supply piston 70 upward synchronously via the connecting plate 71, compressing the second air chamber from 75 mL to 5 mL and increasing the pressure from 1 bar to approximately 15 bar. The excess pressure in the first air chamber is then replenished through the one-way valve assembly, ensuring consistent nailing force.

[0086] The height adjustment member 121 of the adjustment base 120 allows the operator to adjust the compression stroke of the air supply piston 70 according to actual needs. For example, adjusting the height of the adjustment base 120 can increase the compression ratio of the second air chamber, thereby increasing the air supply pressure to meet the needs of different nailing tasks. This flexibility makes the nail driver more adaptable and meets various working conditions.

[0087] The volume ratio of the second air chamber to the first air chamber is designed to be 0.094, ensuring that the air supply from the air supply device matches the leakage of the first air chamber, avoiding over- or under-supply. An O-ring is installed at the threaded connection between the adjustment seat 120 and the connecting plate 71 to prevent high-pressure gas leakage. The sealing ring is made of high-temperature resistant nitrile rubber.

[0088] This embodiment incorporates the design of the rack 51, power gear 110, and toothless segment 111 to achieve precise nailing and resetting of the piston rod 50. Optimization of the connecting plate 71 and adjustment seat 120 enhances the synchronous movement and compression stroke adjustment of the air supply piston 70. Furthermore, a reasonable gas volume ratio ensures the stable performance of the nail driver. These improvements significantly enhance nailing efficiency, maintenance convenience, and applicability compared to Example 2.

[0089] Example 7

[0090] Based on the above embodiments (Examples 1 to 7), this embodiment further optimizes the structural design of the one-way air supply valve and introduces a preferred solution in which the valve body 80 is connected to the upper end of the air supply cylinder 60 by threads to enhance the pressure adjustment flexibility of the air spring nailer 1.

[0091] In this embodiment, the valve body 80 of the one-way air supply valve is threadedly connected to the upper end of the air supply cylinder 60. The valve body 80 can be made of corrosion-resistant brass and finely polished to ensure airtightness. A sealing ring is also provided between the valve body 80 and the air supply cylinder 60. The lower end of the valve body 80 is machined with external threads that mate with the internal threads on the inner wall of the upper end of the air supply cylinder 60. The inner wall of the upper end of the air supply cylinder 60 allows the valve body 80 to be rotated to adjust its screwing depth, thereby varying the volume of the second air chamber. A through hole 81 is drilled along the axis of the valve body 80 and connects to the airway at the upper end of the air supply cylinder 60. An air guide hole 82 communicates with the through hole, ensuring smooth connection to the external air passage. A sealing bead 83 is positioned within the through hole 82 and preloaded by a pressure spring 84. The pressure spring 84 is mounted within the valve body 80, supporting the sealing bead 83 to seal the air supply hole 82. In practice, an adjustment knob is provided on the outside of the valve body 80 to facilitate manual or tool rotation of the valve body 80. The one-way valve assembly includes an elastic sealing ring 100, specifically comprising a conical annular groove 61, an air supply hole 62, and the elastic sealing ring 100. When the pressure in the second air chamber is higher than that in the first air chamber, the O-ring 100 moves along the conical surface due to the pressure difference, opening the air supply hole 62 and allowing compressed air to flow into the first air chamber.

[0092] By rotating the valve body 80, its threaded connection allows axial movement, thereby varying the volume of the second air chamber. For example, rotating the valve body 80 counterclockwise causes it to move upward, increasing the volume of the second air chamber; rotating it clockwise causes it to move downward, decreasing the volume of the second air chamber. This adjustment directly affects the compression ratio of the second air chamber. As the inflator piston 70 moves upward, the magnitude of the pressure increase caused by this volume change is adjusted accordingly.

[0093] Adjustment of the volume of the second air cavity changes the pressure output of the compressed air. Through the one-way valve assembly, the part of the second air cavity that is higher than the pressure of the first air cavity (for example, from 14.8 bar to 15 bar) supplements the first air cavity, thereby achieving precise air pressure regulation. Compared with Example 5, this design enables the air supply pressure to be finely adjusted according to actual needs to adapt to different nailing tasks. When the pressure of the second air cavity is higher than the pressure of the first air cavity after adjustment, the O-ring 100 moves along the conical annular groove 61, opens the air supply hole 62, and compressed air flows into the first air cavity, restoring its pressure to 15 bar. After the pressure is balanced, the O-ring 100 is reset and the air supply hole 62 is closed to ensure the stability of the one-way air supply process. Compared with Example 2, the flexibility of air pressure regulation is improved, and pressure fluctuations caused by leakage are reduced.

[0094] This embodiment achieves dynamic adjustment of the second air chamber's volume by threading the valve body 80 to the upper end of the air supply cylinder 60, thereby optimizing the compression ratio and air supply pressure. This design, combined with the one-way valve assembly, allows for more flexible maintenance of the first air chamber's pressure at 15 bar, improving the adaptability and stability of the air spring nail driver 1. Compared to the previous embodiment, this optimization further enhances the nail driver's practicality and ease of maintenance, supporting efficient operation in a variety of working conditions.

[0095] In short, the above are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. An air spring nail driver, comprising a housing, a first cylinder, a cover, a working piston, and a piston rod connected to the working piston, wherein the housing, the first cylinder, and the cover form a first air chamber above the working piston for storing high-pressure gas; characterized in that: It also includes an air supply device arranged on the cover body, and the air supply device is used to keep the air pressure in the first air cavity at the working air pressure under the action of the working piston when the working piston is working.

2. The air spring nail driver according to claim 1, characterized in that: The air replenishing device comprises: An air supply cylinder, an air supply piston reciprocating in the air supply cylinder, a one-way air supply valve located at the upper end of the air supply cylinder and forming a second air cavity between the air supply piston, an air supply return spring and a one-way valve assembly; wherein, When the working piston moves downward under the action of the high pressure in the first air chamber, the air-supplement piston moves downward under the action of the air-supplement return spring, increasing the volume of the second air chamber and sucking in external air through the one-way air-supplement valve; when the working piston returns upward, the air-supplement piston is pushed upward, reducing the volume of the second air chamber and compressing the air therein; when the pressure in the second air chamber is higher than the pressure in the first air chamber, the one-way valve assembly opens, allowing compressed air to enter the first air chamber, thereby replenishing the pressure in the first air chamber.

3. The air spring nail driver according to claim 2, characterized in that: The one-way valve assembly includes an elastic sealing ring; wherein, the outer wall of the air-supply cylinder is provided with a conical annular groove, the bottom of the conical annular groove radially passes through a plurality of air-supply holes, the elastic sealing ring is arranged in the annular groove and is used to move along the conical surface under the action of the air pressure difference to open and close the air-supply holes.

4. The air spring nail driver according to claim 3, characterized in that: The axis of the air-supplementing cylinder is coaxial with that of the first cylinder.

5. The air spring nail driver according to claim 3, characterized in that: The air-compensating return spring is arranged in the air-compensating cylinder, with one end abutting against the upper end surface of the air-compensating piston and the other end abutting against the lower end surface of the air-compensating cylinder on a side opposite to the air-compensating piston.

6. The air spring nail driver according to claim 3, characterized in that: A convex shoulder is provided on the outer periphery of the upper end of the air-injection cylinder, a connecting plate is provided on the lower end of the air-injection piston, one end of the air-injection return spring abuts against the convex shoulder of the air-injection cylinder, and the other end abuts against the connecting plate at the lower end of the air-injection piston.

7. The air spring nail driver according to claim 6, characterized in that: The one-way air supply valve includes a valve body, a straight through hole provided in the valve body and extending axially along the valve body, an air guide hole connected to the straight through hole, a pressure ball spring and a sealing ball located in the straight through hole; the valve body is connected to the upper end of the air supply cylinder, and the sealing ball blocks the air guide hole under the action of the pressure ball spring.

8. The air spring nail driver according to claim 6, characterized in that: The air-supplementing cylinder is provided with an outer peripheral boss, and the air-supplementing cylinder is detachably fixed in the cover body through the outer peripheral boss and a locking collar.

9. The air spring nail driver according to any one of claims 6 to 8, characterized in that: The outer surface of the piston rod is provided with a rack along the axial direction, and the air spring nail driver also includes a power gear meshing with the rack, and a toothless section is provided on the outer periphery of the power gear. When the toothless section is aligned with the rack, the piston rod is released to perform the nailing action, and when the power gear re-engages with the rack, the piston rod is driven to reset.

10. The air spring nail driver according to claim 9, characterized in that: The power gear includes transition teeth and normal teeth. The transition teeth are located at both ends of the tooth-missing segment. The central angle corresponding to the tooth-missing segment is 40° to 70°.

11. The air spring nail driver according to claim 10, characterized in that: The transition tooth height is 0.6 to 0.8 times the normal tooth height.

12. The air spring nail driver according to claim 9, characterized in that: During the piston rod resetting process, the power gear drives the working piston to move upward, and drives the air supply piston to move upward synchronously through the connecting plate.

13. The air spring nail driver according to claim 12, characterized in that: It also includes an adjustment seat, which is arranged at the lower end of the connecting disk. During the piston rod reset process, the power gear drives the working piston to move upward, and drives the air replenishing piston to move upward synchronously through the connecting disk and the adjustment seat.

14. The air spring nail driver according to claim 13, characterized in that: The adjustment seat is provided with a height adjustment member for changing the compression stroke of the gas supplement piston in the second gas chamber by adjusting the height of the adjustment seat.

15. The air spring nail driver according to any one of claims 9, characterized in that: The gas filled in the first air cavity is air or nitrogen, and the volume V2 of the second air cavity and the volume V1 of the first air cavity satisfy 0.005≤V2 / V1≤0.

12.

16. The air spring nail driver according to any one of claim 7, characterized in that: The valve body is threadedly connected to the upper end of the air-supplementing cylinder, and is used to change the volume of the second air cavity when the valve body is rotated.

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