CN212497578U

CN212497578U - Air nail gun

Info

Publication number: CN212497578U
Application number: CN202020055286.4U
Authority: CN
Inventors: 刘贵文; 毋宏兵; 徐刚
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2021-02-09
Anticipated expiration: 2030-01-10

Abstract

The application relates to a pneumatic nail gun, comprising: a housing, a cylinder assembly and a balancing valve; the shell also comprises a high-pressure cavity, a balance cavity, a reset cavity and an air outlet cavity; the balance valve is movably arranged between the balance cavity and the high-pressure cavity and at least has two positions; when the balance valve is in the first position, the balance valve is abutted against the air outlet end, the opening of the cylinder body is communicated with the high-pressure cavity, and the opening is separated from the air outlet cavity; when the balance valve is in the second position, the balance valve is abutted against the opening, the opening is separated from the high-pressure cavity, and the interior of the cylinder body is communicated with the air outlet cavity through the opening; the air nail gun also comprises a first air flow channel used for communicating the reset cavity and the air outlet cavity; when the nailing is finished, the high-pressure gas in the cylinder body flows to the gas outlet cavity through the opening; the pressure release valve is closed, and high-pressure gas in the gas outlet cavity flows to the reset cavity to prepare for resetting the first piston; and when the gas pressure in the reset cavity reaches a preset value, the pressure release valve is opened, and the gas outlet cavity is communicated with the atmosphere.

Description

Air nail gun

Technical Field

The utility model relates to a pneumatic tool, especially a pneumatic nail rifle.

Background

In the market at present, an air nail gun is connected with an external air source, high-pressure air of the external air source is divided into two parts after entering the air nail gun, one part is used for carrying out nailing action, and the other part is used for resetting a piston. Wherein, the air outlet cavity is always communicated with the atmosphere; when the nailing operation is completed, the user releases the trigger, and the high-pressure gas at the left end of the piston flows to the atmosphere through the gas outlet cavity, so that the waste of the high-pressure gas is caused. In addition, in the prior art, the air nail gun is provided with at least two groups of through holes in the front and back directions on the cylinder, when the piston moves to a position between the two groups of through holes, high-pressure air enters the reset cavity from the through hole at the rear side, and therefore the power of the piston movement is weakened; meanwhile, high-pressure gas in the reset cavity can enter the cylinder body from the through hole on the front side and is located in front of the piston, and resistance is increased for the forward movement of the piston. Therefore, in the nailing gun of the prior art, the cylinder diameter of the cylinder has to be increased in order to ensure the nailing strength.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gas nail rifle, it can also reduce the volume and the weight of integrated device, and is light and handy portable with high-pressure gas make full use of in the time of the energy saving.

In order to achieve the above purpose, the utility model provides a following technical scheme: a pneumatic nailer, comprising: the shell is provided with a nail outlet end and an air outlet end which are oppositely arranged; the shell comprises a handle cavity communicated with an air source, a high-pressure cavity communicated with the handle cavity, a balance cavity, a reset cavity and an air outlet cavity; the cylinder assembly is accommodated in the shell and comprises a cylinder body and a first piston; one end of the cylinder body is provided with an opening, and the other end of the cylinder body is connected with the nail outlet end; the first piston moves in the cylinder body and is provided with a first limit position far away from the nail outlet end and a second limit position close to the nail outlet end; the balance valve is movably arranged in the shell and is provided with a through hole, and the balance valve is at least provided with two positions; in a first position, the balancing valve separates the opening from the outlet chamber, the opening communicating with the high pressure chamber; in the second position, the balance valve separates the opening from the high-pressure cavity, and the opening is communicated with the air outlet cavity through the through hole; the gas nail gun also comprises a first gas flow channel for communicating the reset cavity and the gas outlet cavity, and gas can only flow from the gas outlet cavity to the reset cavity in the first gas flow channel; the gas nail gun also comprises a pressure relief valve, and the pressure relief valve is used for opening or closing the gas outlet cavity; when the first piston moves to the second limit position and the balance valve moves to the second position, the gas in the cylinder body flows to the gas outlet cavity through the opening and the through hole; the pressure relief valve is closed, and the gas flows from the gas outlet cavity to the reset cavity through the first gas flow channel; when the gas pressure in the reset cavity reaches a preset value, the pressure release valve is opened, and the gas outlet cavity is communicated with the atmosphere.

In one embodiment, the pressure relief valve is movably disposed in the housing and has a first end surface located in the air outlet cavity; and under the action of the gas in the gas outlet cavity, the pressure release valve moves to the position for closing the gas outlet cavity.

In one embodiment, the gas nail gun further comprises a pressure relief cavity communicated with the gas outlet cavity, the pressure relief valve is provided with a second end face positioned in the pressure relief cavity, and under the action of gas in the pressure relief cavity, the pressure relief valve moves to a position for opening the gas outlet cavity; the effective area of the first end surface is smaller than that of the second end surface.

In one embodiment, the pressure relief cavity communicates with the outlet cavity through a second air flow passage having a smaller radial dimension than the first air flow passage.

In one embodiment, the pressure relief valve comprises a pressure relief valve body and a second piston, the second piston being located within the pressure relief chamber; one end of the pressure relief valve body is positioned in the air outlet cavity and is provided with the first end face; the other end of the pressure relief valve body is positioned in the pressure relief cavity and is connected with the second piston; the effective area of the second end face is equal to the sum of the area of the end face of the pressure relief valve body located in the pressure relief cavity and the area of the end face of the second piston.

In one embodiment, the pressure relief valve body is provided with a second airflow channel in a penetrating manner, and the pressure relief cavity is communicated with the air outlet cavity through the second airflow channel.

In one embodiment, the gas nail gun further comprises a first housing connected with the gas outlet end, and an elastic member is arranged between the first housing and the pressure release valve and provides a force for promoting the pressure release valve to move to a position for opening the gas outlet cavity.

In one embodiment, the air nailer further comprises a control unit; the control unit comprises a controller and a sensor; the sensor is used for measuring the gas pressure in the reset cavity; and the controller controls the pressure relief valve to be closed or opened according to the gas pressure of the reset cavity.

In one embodiment, the air nailer further includes a seal disposed on the housing, the seal abutting the through hole to separate the opening from the air exit cavity in the first position.

In one embodiment, the switch assembly includes a switch chamber in communication with the balance chamber, and a trigger movable within the switch chamber to communicate the switch chamber with the handle chamber or to communicate the switch chamber with the atmosphere.

In one embodiment, a one-way valve is disposed within the first air flow passage.

To achieve the above object, another solution of the present invention is: a pneumatic nailer, comprising: the shell is provided with a nail outlet end and an air outlet end which are oppositely arranged; the shell comprises a handle cavity communicated with an air source, a high-pressure cavity communicated with the handle cavity, a balance cavity, a reset cavity and an air outlet cavity; the cylinder assembly is accommodated in the shell and comprises a cylinder body and a first piston; one end of the cylinder body is provided with an opening, and the other end of the cylinder body is connected with the nail outlet end; the first piston moves in the cylinder body and is provided with a first limit position far away from the nail outlet end and a second limit position close to the nail outlet end; the balance valve is movably arranged in the shell and is provided with a through hole, and the balance valve is at least provided with two positions; in a first position, the balancing valve separates the opening from the outlet chamber, the opening communicating with the high pressure chamber; in the second position, the balance valve separates the opening from the high-pressure cavity, and the opening is communicated with the air outlet cavity through the through hole; the gas nail gun also comprises a first gas flow channel for communicating the reset cavity and the gas outlet cavity, and gas can only flow from the gas outlet cavity to the reset cavity in the first gas flow channel; the gas nail gun also comprises a pressure relief valve, and the pressure relief valve is used for opening or closing the gas outlet cavity; when the first piston moves to the second limit position and the balance valve moves to the second position, the gas in the cylinder body flows to the gas outlet cavity through the opening and the through hole; the pressure relief valve is closed, and the gas flows from the gas outlet cavity to the reset cavity through the first gas flow channel; when the gas pressure in the reset cavity is equal to the gas pressure in the gas outlet cavity, the pressure release valve is opened, and the gas outlet cavity is communicated with the atmosphere.

To achieve the above object, another solution of the present invention is: a pneumatic nailer, comprising: the shell is provided with a nail outlet end and an air outlet end which are oppositely arranged; the shell comprises a handle cavity communicated with an air source, a high-pressure cavity communicated with the handle cavity, a balance cavity, a reset cavity, an air outlet cavity and a switch assembly; the cylinder assembly is accommodated in the shell and comprises a cylinder body and a first piston; one end of the cylinder body is provided with an opening, and the other end of the cylinder body is connected with the nail outlet end; the first piston moves in the cylinder body and is provided with a first limit position far away from the nail outlet end and a second limit position close to the nail outlet end; the cylinder body is also provided with a through hole; the balance valve is movably arranged in the shell and is provided with a through hole, and the balance valve is at least provided with two positions; in a first position, the balancing valve separates the opening from the outlet chamber, the opening communicating with the high pressure chamber; in the second position, the balance valve separates the opening from the high-pressure cavity, and the opening is communicated with the air outlet cavity through the through hole; when the balance valve moves to the first position, the gas in the high-pressure cavity enters the interior of the cylinder body through the opening, the first piston is pushed to move towards the second limit position, and the gas pressure for pushing the first piston to move in the cylinder body at the moment is defined as nailing pressure; when the first piston moves to the second limit position and the balance valve moves to the second position, gas in the reset cavity enters the cylinder body through the through hole, the first piston is pushed to move towards the first limit position, and the gas pressure for pushing the first piston to move in the cylinder body at the moment is defined as reset pressure; the nailing pressure > the resetting pressure.

In one embodiment, the air nailer includes a first air flow passage communicating the air outlet cavity with the reset cavity; the gas can only flow from the gas outlet cavity to the reset cavity in the first gas flow channel.

In one embodiment, when the first piston moves to the second limit position and the balancing valve moves to the second position, gas within the cylinder flows to the reset chamber via the opening, the gas outlet chamber, and the first gas flow passage.

Through the arrangement of the first air flow channel for communicating the reset cavity and the air outlet cavity, when the nailing operation is completed and the trigger is loosened, at least part of high-pressure air in the first variable cavity can enter the reset cavity through the through hole and the first air flow channel in sequence to prepare for resetting of the first piston, so that the utilization rate of the high-pressure air is improved;

the air outlet cavity is selectively communicated with the atmosphere through a pressure relief mechanism provided with a pressure relief valve assembly, a pressure relief cavity and an air outlet; when high-pressure gas in the cylinder body flows to the gas outlet cavity through the through hole, the pressure relief valve assembly closes the communication between the gas outlet and the gas outlet cavity, the gas outlet cavity is not communicated with the atmosphere, and the high-pressure gas in the gas outlet cavity can be conveyed to the reset cavity through the first gas flow channel; when the intracavity that resets is full of high-pressure gas, high-pressure gas in the pressure release chamber will drive the relief valve subassembly and remove to the gas vent with go out the gas cavity intercommunication, the high-pressure gas in the intracavity of giving vent to anger can be via the gas vent pressure release, and the high-pressure gas in the chamber that resets can get into the inside of cylinder body, promotes first piston and resets. Therefore, high-pressure gas for driving the first piston to nail can enter the reset cavity through the first gas flow channel and then drive the first piston to reset, and the utilization efficiency of the high-pressure gas is improved; therefore, only less gas is consumed to realize nailing work, the overall volume and weight of the air nail gun are reduced while energy is saved, and the air nail gun is light and portable.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

FIG. 1 is a schematic view of a prior art air nailer with the counterbalance valve moved to a second position after the handle chamber is inflated.

FIG. 2 is a schematic view of the nailer of FIG. 1 with the counterbalance valve moved to a first position after the trigger is depressed.

FIG. 3 is a schematic view of the pneumatic nailer of FIG. 1 with the first piston moving to a second extreme position to complete nailing.

FIG. 4 is a schematic view of the nailer of FIG. 1 after release of the trigger, the equalization valve moving to a second position, and the first variable chamber venting to atmosphere.

FIG. 5 is a schematic view of a prior art nailer with gas in the reset chamber acting on the first piston to reset it to a first limit position.

Fig. 6 is a schematic view showing the state of the balance valve of the air nail gun according to the first embodiment of the present invention after the handle chamber is inflated.

FIG. 7 is a schematic view of the nailer of FIG. 6 with the counterbalance valve moved to a first position after the trigger is depressed.

FIG. 8 is a schematic view of the pneumatic nailer of FIG. 6 with the first piston moved to a second extreme position to complete nailing.

FIG. 9 is a schematic view of the nailer of FIG. 6 after release of the trigger, with the equalization valve moved to a second position, the vent chamber being charged to the reset chamber and the vent chamber not being vented to atmosphere.

Fig. 10a is a schematic view of the air nailer of fig. 6 with the relief valve moved to a position where the vent chamber is open to atmosphere, and fig. 10b is an enlarged view of a portion of the relief valve.

FIG. 11 is a schematic view of the air nailer of FIG. 6 with air in the reset chamber acting on the first piston to reset it to the first limit position.

Fig. 12 is a sectional view of a pneumatic nail gun according to a second embodiment of the present invention, relating to a pressure release mechanism.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1 to 5, a pneumatic nail gun 100 in the prior art is shown, which can be used in connection with wooden structures of houses, wooden furniture and other wooden structures, and the application thereof is not limited in particular.

The air nail gun 100 includes: a housing and switch assembly 3; the housing includes a handle portion 1 to be gripped, and a body portion 2 connected to the handle portion 1 to perform a nailing operation. Also included in the housing is a handle chamber 11 in communication with a gas source, a high pressure chamber 213 in communication with handle chamber 11, a balance chamber 214, a reset chamber 215, and a vent chamber 216 in communication with the atmosphere.

The handle part 1 comprises the handle cavity 11 and an air inlet 12 arranged at one side of the handle cavity 11 to communicate the handle cavity 11 with an external air source, which can be a pump or the like, for delivering high-pressure air into the handle cavity 11 through the air inlet 12.

In the present embodiment, the air inlet 12 is provided at the bottom of the handle 1 in the height direction of the air nailer 100, which improves the overall appearance and facilitates the user's operation. Indeed, in other embodiments, the air inlet 12 may be disposed at other positions on the handle portion 1, and is not limited thereto, as the case may be.

The main body 2 includes a nail output end 211 and a gas output end 212 which are oppositely arranged, a cylinder assembly arranged in the main body 2, a balance valve 25 arranged in the main body 2, and a firing pin 24 penetrating through the nail output end 211.

The cylinder assembly includes a cylinder block 22, a first piston 23 housed in the cylinder block 22 and dividing the cylinder block 22 into a first variable chamber 222 and a second variable chamber 223, and a striker 24 connected to the first piston 23. The first piston 23 is reciprocable within the cylinder 22 and has a first extreme position away from the nail-ejection end 211, as shown in figures 1 and 5, and a second extreme position close to the nail-ejection end 211, as shown in figures 3 and 4. In order to prevent the impact force generated by the reciprocating motion of the first piston 23 in the cylinder 22 from being too large to damage the nail-discharging end 211, a buffer block 26 is further disposed between the cylinder 22 and the nail-discharging end 211 to reduce the acting force of the first piston 23 on the nail-discharging end 211. The first piston 23 has a first inclined surface (not numbered), and the buffer block 26 has a second inclined surface (not numbered), and when the first piston 23 collides with the buffer block 26, a gap exists between the first inclined surface and the second inclined surface, and the gap allows high-pressure gas in the reset chamber 215 (the reset chamber 215 will be described later) to enter the cylinder 22. One end of the cylinder 22 is provided with an opening 224 and the other end is connected with the nail outlet end 211.

It should be noted that the first variable chamber 222 and the second variable chamber 223 are present in correspondence with the first piston 23 being in the non-extreme position. When the first piston 23 is in the first extreme position, the first piston 23 is flush with one end of the cylinder 22, as shown in fig. 1, and the first variable chamber 222 is not present. When first piston 23 moves to the aforementioned second limit position, first piston 23 abuts on cushion block 26, as shown in fig. 3, and second variable chamber 223 is substantially absent. The cylinder 22 is provided with the aforementioned high pressure chamber 213 and the reset chamber 215 on the periphery thereof, and a partition mechanism 27 is provided between the high pressure chamber 213 and the reset chamber 215. The high pressure chamber 213 communicates with the handle chamber 11 through the connecting passage 13. The partition mechanism 27 may be a partition plate, and a seal ring is further provided on the partition plate 27 to enhance the sealing performance between the high pressure chamber 213 and the reset chamber 215.

The switch assembly 3 comprises the switch cavity 31 and a trigger 32 which can move in the switch cavity 31. The air nailer 100 further includes a fourth air flow channel 253 and a fifth air flow channel 33, the balance chamber 214 is communicated with the switch chamber 31 through the fourth air flow channel 253, the handle chamber 11 is communicated with the switch chamber 31 through the fifth air flow channel 33, the trigger 32 is moved to enable the balance chamber 214 to be communicated with the handle chamber 11 through the switch chamber 31, as shown in fig. 1 and 4, or enable the balance chamber 214 to be communicated with the atmosphere through the switch chamber 31, as shown in fig. 2 and 3.

The switch assembly 3 further comprises a return spring 34 for connecting the switch cavity 31 and the trigger 32, wherein the return spring 34 enables the trigger 32 to be in an initial state under a natural state, and the switch cavity 31 is communicated with the handle cavity 11; applying an external force to the trigger 32 causes the trigger 32 to move, at which time the return spring 34 is compressed and the switch chamber 31 is open to the outside atmosphere; after the external force is removed, the trigger 32 is restored to the initial state by the elastic force of the return spring 34.

The balance valve 25 is movably disposed between the balance chamber 214 and the high pressure chamber 213, and has a through hole 252 formed therein. The equalization valve 25 has at least two positions under the combined action of the gas in the equalization chamber 214 and the gas in the high pressure chamber 213. In this embodiment, a first elastic member 251 is further disposed in the balance cavity 214. The left end of the balance valve 25 receives the sum of the force of the first elastic member 251 and the gas in the balance chamber 214, and the right end of the balance valve 25 receives the force of the gas in the high pressure chamber 213. In the first position, the balancing valve 25 abuts the gas outlet end 212, as shown in fig. 2 and 3. At this time, the opening 224 communicates with the high pressure chamber 213, and the opening 224 is partitioned from the outlet chamber 216. In the second position, the balance valve 25 abuts the opening 224, and as shown in fig. 1 and 4, the opening 224 is separated from the high pressure chamber 213, and the opening 224 communicates with the outlet chamber 216 through the through hole 252.

In this embodiment, a sealing ring (not numbered) is further disposed between the balance valve 25 and the gas outlet end 212, so that the balance cavity 214 is not communicated with the gas outlet cavity 216, and the balance cavity 214 is not communicated with the high pressure cavity 213.

Referring to fig. 3, when the trigger 32 is pressed, the balance chamber 214 is communicated with the atmosphere through the switch chamber 31; at this time, the equilibrium chamber 214 is at atmospheric pressure, and the high-pressure chamber 213 is at high-pressure. The acting force applied to the left end of the balance valve 25 is smaller than the acting force applied to the right end of the balance valve 25, and the balance valve 25 moves leftwards and is abutted to the air outlet end 212; at this time, the high-pressure gas in the high-pressure chamber 213 flows into the first variable chamber 222 through the opening 224, and pushes the first piston 23 to move toward the second limit position, thereby completing the nailing operation.

The nail outlet end 211 is provided with a hole, the striker 24 penetrates through the nail outlet end 211 through the hole and is butted with an external nail bin, and the first piston 23 reciprocates to drive the striker 24 to reciprocate so as to generate impact force to eject the nails in the nail bin out of the nail bin.

Referring to fig. 3, the reset chamber 215 surrounds the cylinder 22, and the cylinder 22 further has two sets of through holes 221 for communicating the reset chamber 215 with the inside of the cylinder 22. The through-holes 221 include through-

holes

221a and 221b arranged in the front-rear direction. When the first piston 23 moves towards the nail outlet end 211 under the action of the high-pressure gas, part of the high-pressure gas in the first variable cavity 222 enters the reset cavity 215 through the through hole 221a, and finally the reset cavity 215 is filled with the high-pressure gas. The high pressure gas in the reset chamber 215 is used to reset the first piston 23.

It should be noted that when the hole penetrates through one side of the nail end 211, the hole penetrates through one side of the cylinder 22 close to the nail end 211, and the hole enables the second variable cavity 223 to communicate with the outside; the through hole 221b is formed such that the reset chamber 215 can communicate with the second variable chamber 223, but the diameter of the hole is much smaller than that of the through hole 221b, so that when the high pressure gas in the reset chamber 215 enters the second variable chamber 223, the high pressure gas does not directly escape from the hole.

When the nailing operation is completed, the trigger 32 is released and the trigger 32 is returned to the initial state by the return spring 34, as shown in fig. 4. At this time, the balance chamber 214 communicates with the handle chamber 11 again through the switch chamber 31, and the balance chamber 214 receives the high-pressure gas from the handle chamber 11; under the combined action of the high-pressure gas in the balance cavity 214 and the elastic member 251, the balance valve 25 moves towards the nail outlet end 211; the balance valve 25 moves into abutment with the opening 224, the high-pressure chamber 213 is separated from the opening 224, and the opening 224 communicates with the outlet chamber 216 through the through hole 252; high pressure gas from within the first variable cavity 222 will communicate with the outlet cavity 216 via the through-hole 252; since the outlet chamber is open to atmosphere, the air pressure in the first variable chamber 222 is rapidly reduced to atmospheric pressure level. At this time, the left end of the first piston 23 is acted by the atmosphere, the right end of the first piston 23 is acted by the high-pressure gas from the reset cavity 215, and the first piston 23 will move towards the gas outlet end 212 to the first limit position, completing the reset operation.

To more clearly illustrate the operation of the nailer 100The principle of the nailing and resetting of the first piston 23 will be described in detail below with reference to fig. 1 to 5. Here, the name atmospheric pressure is P₀The pressure of the gas in the balance chamber 214 is P₁The pressure of the gas in the reset chamber 215 is P₂The pressure of the gas in the high pressure chamber 213, i.e. the working pressure of the source gas, is P₃Wherein P is₃>P₀。

Fig. 1 shows an initial state diagram of the air nailer 100. At this time, the first piston 23 is located at the first limit position, that is, the first piston 23 is located at the side of the cylinder 22 farthest from the nail end 211; the trigger 32 is in its initial position and the switch chamber 31 is in communication with the handle chamber 11. When high pressure gas is supplied to handle chamber 11 from an external source, high pressure gas, i.e., P, is present in both high pressure chamber 213 and balance chamber 214₁＝P₃. However, in consideration of the effective force receiving areas of the left and right ends of the balance valve 25 and the presence of the elastic member 251, the balance valve 25 is moved rightward into abutment with the opening 224 of the cylinder 22; at this time, the high pressure chamber 213 and the opening 224 are separated, and the gas in the high pressure chamber 213 cannot enter the cylinder 22.

Referring to FIG. 2, when the trigger 32 is pressed, the balance cavity 214 is connected to the outside atmosphere through the switch cavity 31, and the balance cavity 214 is rapidly decompressed to P₁＝P₀(ii) a At this time, the high pressure gas still enters the high pressure chamber 213 from the handle chamber 11, and the gas pressure P in the high pressure chamber 213₃>Gas pressure P of balance chamber 214₁The acting force of the high-pressure gas in the high-pressure cavity 213 on the balance valve 25 is greater than the sum of the acting forces of the gas in the balance cavity 214 and the elastic member 251, and the balance valve 25 moves towards the gas outlet end 212 until the balance valve 25 abuts against the gas outlet end 212; at this point, the through-hole 252 abuts the seal 28, and the opening 224 is isolated from the outlet chamber 216; the opening 224 is communicated with the high pressure chamber 213, and the high pressure gas in the high pressure chamber 213 enters the first variable chamber 222 through the opening 224, pushing the first piston 23 to move toward the second limit position.

Referring to fig. 3, the trigger 32 is still in a depressed state. That is, the equalizing chamber 214 is open to the outside atmosphere. The high pressure gas in the high pressure chamber 213 pushes the first piston 23 to move toward the second limit position, thereby completing the nailing operation. When the first piston 23 moves to the middle of the through

holes

221a and 221b, part of the high pressure gas enters the interior of the reset chamber 215 from the through hole 221a to charge the reset chamber 215.

Referring to fig. 4 and 5, the trigger 32 is released and the trigger 32 returns to the initial position. At this time, the balance chamber 214 communicates with the handle chamber 11 again through the switch chamber 31. I.e., the balance chamber 214 is re-vented with high pressure gas. High-pressure gas enters the balance cavity 214 from the handle cavity 11 and the switch cavity 31, so that the gas pressure P in the balance cavity 214₁Gas pressure P of high pressure chamber 213₃(ii) a The balance valve 25 is brought into contact with the opening 224 again by the high-pressure gas and the urging force of the elastic member 251, and the high-pressure chamber 213 is separated from the opening 224. At this time, the first variable cavity 222 communicates with the gas outlet cavity 216 through the through hole 252, so that the high-pressure gas in the first variable cavity 222 is rapidly released to the atmospheric pressure. At this time, the gas in the reset chamber 215 enters the interior of the cylinder 22 through the through hole 221b, drives the first piston 23 to move toward the gas outlet end 212, and finally completes the reset.

In the prior art, when the trigger 32 is pressed and the balance valve 25 moves to the first position, the high-pressure gas in the high-pressure chamber 213 enters the interior of the cylinder 22 through the opening 224, and drives the first piston 23 to move toward the second limit position, thereby completing the nailing operation. Defining the pressure of the gas in the cylinder 22 for driving the first piston 23 to move toward the second limit position as the nailing pressure, which is equal to the working pressure P3 of the gas source; when the trigger 32 is released and the balance valve 25 moves to the second position, the gas in the reset chamber 215 enters the interior of the cylinder 22 through the through hole 221b and drives the first piston 23 toward the first limit position, completing the reset operation. The gas pressure inside the cylinder 22 for driving the first piston 23 towards the first extreme position at this time is defined as the reset pressure, which is equal to the working pressure P3 of the gas source.

When the gas in the reset chamber 215 enters the cylinder 22 from the through hole 221b, a small portion of the gas is discharged from the nail-discharging end 211 to the outside due to the hole of the nail-discharging end 211. But the diameter of the hole of the nail outlet 211 is much smaller than the diameter of the second through hole 221b so that the remaining gas is sufficient to drive the first piston 23 to reset.

As can be seen from the operation principle of the air nail gun 100 in the prior art, in order to drive the first piston 23 to reset, a part of high-pressure air needs to be additionally provided in the reset cavity 215, and the utilization efficiency of the air is low. In addition, the prior art air nailer 100 has two sets of through holes, i.e., the through hole 221a and the through hole 221b, formed in the cylinder 22. Wherein the through hole 221a is disposed near the balancing valve 25, and the through hole 221b is disposed near the nail-out end 211. When the first piston 23 moves between the through hole 221a and the through hole 221b, a part of the high-pressure gas enters the reset cavity 215 from the through hole 221a, so that the force of the high-pressure gas pushing the first piston 23 to move towards the nail outlet end 211 is weakened; and the high-pressure gas in the reset chamber 215 also enters the second variable chamber 223 through the through hole 221b, hindering the advance of the first piston 23. Therefore, in the conventional air nail gun, the cylinder diameter of the cylinder 22 has to be increased to ensure the nailing strength.

Referring to fig. 6, in order to improve the utilization efficiency of the gas, the first gas flow channel 7 for communicating the gas outlet cavity 216 and the reset cavity 215 is provided in the gas nail gun 100' of the present invention. When the nailing operation is completed, the user releases the trigger 32, as shown in fig. 9, and the high-pressure gas in the first variable chamber body 222 flows to the reset chamber 215 via the opening 224, the through hole 252, the gas outlet chamber 216, and the first gas flow path 7 in preparation for the reset of the first piston 23. That is, in the present embodiment, the portion of the high-pressure gas located in the reset chamber 215, which drives the first piston 23 to reset, is a portion or all of the high-pressure gas previously used to drive the first piston 23 to complete the nailing operation. Meanwhile, only one set of through holes 221 is formed in the cylinder 22 for the gas in the reset chamber 215 to enter the interior of the cylinder 22. Therefore, unlike the prior art that needs to provide high-pressure gas for driving the first piston 23 to pin and for resetting the first piston 23, the present embodiment reuses the part of the gas for driving the first piston 23 to pin, thereby greatly improving the utilization efficiency of the gas.

Also, the gas in the first gas flow path 7 is allowed to flow only from the gas outlet chamber 216 to the reset chamber 215. In a possible embodiment, a one-way valve 71 is arranged in the first air flow channel 7.

It is known that to reset the first piston 23, one of the prerequisites is that the reset chamber 215 is filled with enough high pressure gas, and the other precondition is that the high pressure gas in the cylinder 22 at the left end of the first piston 23 can be discharged. In the prior art, since the air outlet cavity 216 is always communicated with the atmosphere, when the first piston 23 moves to the second limit position and the balance valve 25 moves to the second position, as shown in fig. 4, the high-pressure air in the cylinder 22 for driving the nailing of the first piston 23 will flow to the outside atmosphere through the opening 224, the through hole 252 and the air outlet cavity 216; in this way, the left end of the first piston 23 is acted by atmospheric air, so that the high-pressure gas in the reset cavity 215 can enter the interior of the cylinder 22 through the through hole 221b, and the first piston 23 is pushed to move towards the first limit position, and the nailing operation is completed, as shown in fig. 5.

In the present embodiment, the first piston 23 needs to be reset by the high-pressure gas that drives the nailing of the first piston 23. To this end, the outlet chamber 216 has an open state in communication with the atmosphere and a closed state in non-communication with the atmosphere. When the nailing operation is completed and the high-pressure gas in the cylinder 22 needs to flow to the reset chamber 215 through the opening 224, the through hole 252 and the first gas flow passage 7, the gas outlet chamber 216 is not communicated with the atmosphere, as shown in fig. 9. When the reset chamber 215 is filled with high pressure gas sufficient to reset the first piston 23, the outlet chamber 216 is open to the atmosphere, as shown in fig. 10 a.

To this end, the nailer 100' also includes a pressure relief mechanism 5 connected to the outlet end 212. The pressure relief mechanism 5 includes a pressure relief valve 53 for opening or closing the gas outlet chamber. In this embodiment, please refer to fig. 7, the protruding portion 4 is disposed at the air outlet end 212, and the pressure relief mechanism 5 is sleeved on the protruding portion 4. Specifically, the pressure relief mechanism 5 includes a first housing 51 connected to the protruding portion 4 and formed with a first chamber 511, an exhaust port 52 provided in the first housing 51 to communicate with the atmosphere, and a pressure relief valve 53 for closing or opening the exhaust port 52, and the first chamber 511 is provided in communication with the exhaust chamber 216.

In the present embodiment, the outer side of the protruding portion 4 and the inner wall of the first housing 51 are both provided with threads, and the first housing 51 and the protruding portion 4 are screwed together.

It goes without saying that in other embodiments, the connection between the first housing 51 and the protruding portion 4 may be other, such as a snap connection, and the like, and is not particularly limited herein, depending on the actual situation.

Referring to fig. 7 to 9, a first protrusion 512 is disposed on an inner wall of the first housing 51, a second protrusion 531 abutting against the first protrusion 512 is disposed on the pressure relief valve 53, the first protrusion 512 is disposed on a side of the first housing 51 near the air outlet end 212, and the air outlet 52 is disposed on a side of the first housing 51 far from the air outlet end 212. More specifically, the second protrusion 531 is provided on the relief valve body 530 (the relief valve body 530 will be described later).

A pressure relief valve 53 moves within first chamber 511 to divide first chamber 511 into a discharge chamber 514 communicating with exhaust port 52 and a collection chamber 513 communicating with exhaust chamber 216. When the first protrusion 512 abuts against the second protrusion 531, the gas outlet cavity 216 is not communicated with the gas outlet 52, and the high-pressure gas flows from the gas outlet cavity 216 to the reset cavity 215 through the first gas flow channel 7; when the first protrusion 512 is separated from the second protrusion 531, the outlet cavity 216 communicates with the exhaust port 52, and the high-pressure gas flows from the outlet cavity 216 to the exhaust port 52 and is discharged to the atmosphere.

The pressure relief mechanism 5 further includes a pressure relief cavity 611 having the second housing 61, a second air flow passage 532 is provided between the pressure relief cavity 611 and the air outlet cavity 216, and the high-pressure air flows from the air outlet cavity 216 to the pressure relief cavity 611 through the second air flow passage 532.

The relief valve 53 has a first end surface 533 disposed in the outlet chamber 216 and a second end surface 534 disposed in the relief chamber 611. Here, the effective area of the first end surface 533 for receiving the gas in the gas outlet cavity 216, so that the pressure relief valve 53 has a leftward movement tendency, is defined as the effective area of the first end surface 533; on the second end surface 534, the effective area for receiving the gas action of the pressure relief chamber 611 so that the pressure relief valve 53 has a rightward movement tendency is the effective area of the second end surface 534. Here, the gas in the gas outlet chamber 216 acting on the first end surface 533 of the pressure relief valve 53 will cause the pressure relief valve 53 to move toward a position closing the gas outlet chamber 216; gas within pressure relief chamber 611 acts on second end 534 of pressure relief valve 53 to move pressure relief valve 53 toward a position that opens gas outlet chamber 216.

In the present embodiment, as shown in fig. 10b, the effective area of the second end surface 534 of the relief valve 53 is larger than the effective area of the first end surface 533. So configured, when pressure of gas in pressure relief chamber 611 and gas outlet chamber 216 through second gas flow channel 532 is equal, pressure relief valve 53 can move toward gas outlet end 212 because the effective area of second end 534 is larger than the effective area of first end 533. Thus, the second projection 531 of the relief valve 53 is away from the first projection 512, the air outlet chamber 216 communicates with the atmosphere through the air outlet 52, and the air outlet chamber 216 is opened.

More specifically, the relief valve 53 includes a relief valve body 530 and the second piston 62 disposed in the relief chamber 611, and the relief valve body 530 has the first end surface 533. At least part of the relief valve body 530 protrudes out of the relief chamber 611 to be connected with the second piston 62, and the effective area of the second end surface 534 is equal to the sum of the end surface area of the relief valve body 530 protruding out of the relief chamber 611 and the end surface area of the second piston 62.

In the present embodiment, the end surface of the second piston 62 is flush with the end surface of the relief valve body 530 in the relief chamber 611. Indeed, in other embodiments, the end surface of the second piston 62 and the end surface of the relief valve body 530 in the relief chamber 611 may also be disposed not flush with each other, or the second piston 62 and the end portion of the relief valve body 530 protruding out of the relief chamber 611 are integrally formed, and this is not particularly limited, and depends on the actual situation. In any case. The relief valve 53 has a first end surface 533 disposed in the air outlet chamber 216 and a second end surface 534 disposed in the relief chamber 611, wherein an effective area of the second end surface 534 is larger than an effective area of the first end surface 533.

It should be noted that the high-pressure gas enters the pressure relief chamber 611 from the second gas flow path 532 until the pressure relief valve 53 is pushed toward the outlet end 212 for a time period, which is just enough to ensure that the reset chamber 215 can receive a sufficient amount of high-pressure gas to drive the first piston 23 to reset. In other words, the pressure relief valve 53 is able to move to vent the outlet chamber 216 to atmosphere only when the pressure of the gas received from the outlet chamber 216 at the reset chamber 215 reaches a predetermined value.

Here, the preset values are defined as: the pressure of the gas in the reset chamber 215 is set when the gas in the reset chamber 215 can smoothly reset the first piston 23.

The second housing 61 is connected to the first housing 51 in a manner of a screw connection, a clamping connection, and the like, which is not limited herein and is determined according to practical situations. In order to make the entire pressure relief mechanism 5 beautiful and simple, the second airflow path 532 is provided through the relief valve body 530.

How the nailing operation and the returning operation of the air nail gun 100' of the present embodiment are completed will be described below with reference to fig. 6 to 11.

How the air nailer 100' of the present embodiment nails, since its operation principle is similar to the prior art. This will be described only briefly. As shown in fig. 6, this is an initial stage of the nailing operation. The trigger 32 is not depressed and the first piston 23 is in the first extreme position. The balance valve 25 abuts against the opening 224 of the cylinder 22 by the cooperation of the high-pressure gas and the elastic member 251.

As shown in fig. 7 to 8, when the trigger 32 is pressed, the balance cavity 214 is communicated with the atmosphere through the switch cavity 31, the high-pressure gas in the balance cavity 214 is discharged to the outside atmosphere, and the balance valve 25 is moved to the left to abut against the gas outlet end 212; at this time, the opening 224 is blocked from the gas outlet chamber 216, and the gas in the high pressure chamber 213 enters the interior of the cylinder 22 through the opening 224, pushing the first piston 23 to move to the second limit position, completing the nailing operation.

Fig. 9 to 11 are process views showing how the first piston 23 is reset after the completion of the nailing operation.

Referring to fig. 9, when the trigger 32 is released, the balance cavity 214 is communicated with the handle cavity 11 through the switch cavity 31, and the balance cavity 216 is filled with high-pressure gas again; under the action of the high-pressure gas and the elastic member 251, the balance valve 25 moves to the right to abut against the opening 224; at this time, the opening 224 and the high pressure chamber 213 are blocked, the inside of the cylinder 22 communicates with the outlet chamber 216 through the opening 224, and the high pressure gas in the first variable chamber 222 enters the outlet chamber 216 through the through hole 252; under the action of the high-pressure gas in the gas outlet cavity 216, the pressure relief valve 53 moves to a position where the second protrusion 531 abuts against the first protrusion 512, and the gas outlet cavity 216 is not communicated with the gas outlet 52; a part of the high-pressure gas in the gas outlet chamber 216 flows into the reset chamber 215 through the first gas flow passage 7 to charge the reset chamber 215; another portion flows into pressure relief chamber 611 via second airflow path 532 in preparation for pressure relief.

When the gas in the cylinder 22 passes through the opening 224 and the through hole 252 enters the gas outlet chamber 216, the high-pressure gas does not enter the reset chamber 215 and the pressure relief chamber 611 before; at this time, the pressure of the gas in the gas outlet chamber 216 is at its maximum and substantially equal to the working pressure P3 of the gas source. However, when the gas in the gas outlet chamber 216 enters the reset chamber 215 and the pressure relief chamber 611 through the first gas flow channel 7 and the second gas flow channel 532, the gas pressure in the gas outlet chamber 216 will decrease due to the increased space.

As described above with reference to fig. 10a, 10b and 11, the air nailer 100' is designed such that the relief valve 53 can be moved to a position where the air outlet chamber 216 is open to the atmosphere only when the air pressure in the reset chamber 215 reaches a predetermined value, which enables the first piston 22 to be reset smoothly.

In particular, in the present embodiment, when the high-pressure gas in the gas outlet chamber 216 no longer flows to the reset chamber 215, i.e., the pressure of the gas in the reset chamber 215 is equal to the pressure of the gas in the gas outlet chamber 216, the gas in the reset chamber 215 is sufficient to reset the first piston 23. At this time, the gas pressure in the relief chamber 611 is designed to be equal to the gas pressure in the outlet chamber 216 as well. However, since the effective area of the second end surface 534 of the relief valve 53 is larger than that of the first end surface 533, the relief valve 53 will move toward the air outlet end 212 to a position where the second protrusion 531 is separated from the first protrusion 512; thus, the outlet cavity 216 is communicated with the exhaust port 52, the high-pressure gas in the outlet cavity 216 is exhausted to the atmosphere through the exhaust port 52, and the pressure of the gas in the outlet cavity 216 is reduced to the atmospheric pressure.

As the gas pressure at the left end of the first piston 23 decreases to atmospheric pressure, the high-pressure gas in the reset chamber 215 enters the interior of the cylinder 22 through the through hole 221 and pushes the first piston 23 to move toward the gas outlet end 212 until the first piston 23 returns to the first limit position, completing the reset operation, as shown in fig. 11.

The pressure relief valve 53 will remain in the open position that places the outlet chamber 216 in communication with the atmosphere prior to the next nailing operation.

As shown in fig. 9, when the first piston 23 moves to the second limit position and the balance valve 25 moves to the second position, the high-pressure gas in the cylinder 22 flows to the gas outlet chamber 216 through the opening 224 and the through hole 252; the pressure of the gas in the outlet chamber 216 is at its maximum, substantially equal to the operating pressure P3 of the gas source, while the gas in the outlet chamber 216 has not yet had time to flow to the reset chamber 215 and the pressure relief chamber 611. As the high pressure gas in the outlet chamber 216 begins to flow to the reset chamber 215 and the pressure relief chamber 611, the pressure of the gas in the outlet chamber 216 decreases and the pressure of the gas in the reset chamber 215 and the pressure relief chamber 611 increases.

It is contemplated that the process of the outlet chamber 216 inflating the reset chamber 215 will end with no gas flow between the outlet chamber 216 and the reset chamber 215. That is, the end result of the gas outlet chamber 216 charging the reset chamber 215 is that the gas pressure in the gas outlet chamber 216 is equal to the gas pressure in the reset chamber 215, which is the maximum value that the gas pressure in the reset chamber 215 can reach. The greater the pressure of the gas in the reset chamber 215, the greater the power of the reset of the first piston 23. In this embodiment, in order to most efficiently ensure that the first piston 23 is smoothly reset, the preset value is the gas pressure in the reset chamber 215 when the gas pressure in the reset chamber 215 is equal to the gas pressure in the gas outlet chamber 216.

And we define the preset value as the pressure of the gas in the reset chamber 215 when the gas in the reset chamber 215 is sufficient to drive the first piston 23 to reset. In one possible embodiment, when the gas pressure in the reset chamber 215 reaches a certain proportion of the gas pressure in the gas outlet chamber 216, the gas in the reset chamber 215 is sufficient to drive the first piston 23 to reset smoothly. At this time, the relief valve 53 may be actuated. For example, when the gas pressure in the reset chamber 215 reaches 60% of the gas pressure in the gas outlet chamber 216 during the process of filling the gas outlet chamber 216 with gas to the reset chamber 215, the gas in the reset chamber 215 is sufficient to drive the first piston 23 to reset. At this time, the preset value is 60% of the gas pressure in the gas outlet chamber 216.

In this embodiment, the radial dimensions of the second gas flow path 532 and the first gas flow path 7 are controlled to ensure that the gas pressure in the reset chamber 215 reaches a predetermined value before the pressure relief valve 53 moves. Specifically, the radial dimension of the first air flow passage 7 is larger than the radial dimension of the second air flow passage 532.

In the present embodiment, as shown in fig. 8, the nailing pressure for driving the first piston 23 toward the second limit position within the cylinder 22 is the working pressure P3 of the air source. When the relief valve 53 is actuated to relieve the pressure of the high-pressure gas in the gas outlet chamber 216 to atmospheric pressure, the high-pressure gas from the reset chamber 215 enters the interior of the cylinder 22, and drives the first piston 23 to move toward the first limit position, thereby completing the reset operation. At this time, the return pressure for driving the first piston 23 to complete the return within the cylinder 22 is lower than the operating pressure P3.

In a possible embodiment, as shown in fig. 12, the pressure relief mechanism 5' comprises: a first housing 51 'connected to the air outlet end 212, an air outlet 52' provided on the first housing 51 'and communicating with the atmosphere, a pressure release valve 53' and an elastic member 55. One end of the elastic member 55 abuts against the first housing 51 ', and the other end of the elastic member 55 abuts against the relief valve 53'. The pressure relief valve 53 ' has a first end surface 533 ' located within the outlet chamber 216, and the pressure relief valve 53 ' is moved toward a position closing the outlet chamber 216 by the gas in the outlet chamber 216. And the elastic member 55 provides a force urging the relief valve 53' toward the position of opening the gas outlet chamber 216.

Specifically, the first housing 51 ' is provided with a first protrusion 512 ', and the pressure relief valve 53 ' is correspondingly provided with a second protrusion 531 ' capable of abutting against the first protrusion 512 '. When the pressure relief valve 53 'moves to the position where the second protrusion 531' abuts against the first protrusion 512 ', the air outlet cavity 216 is not communicated with the atmosphere, and the pressure relief valve 53' is located at the closed position; when the relief valve 53 'moves to the second protrusion 531' away from the first protrusion 512 ', the air outlet chamber 216 is open to the atmosphere and the relief valve 53' is in the open position.

Referring to fig. 9 and 12, when the first piston 23 moves to the second limit position and the balance valve 25 moves to the second position, the gas in the cylinder 22 flows into the gas outlet cavity 216 through the opening 224 and the through hole 252; at this time, the gas in the gas outlet chamber 216 has not yet been allowed to flow into the reset chamber 215, and the pressure of the gas in the gas outlet chamber 216 is at its maximum and is substantially equal to the working pressure P3 of the gas source. The pressure of the gas in the gas outlet chamber 216 received by the pressure relief valve 53 ' is greater than the force of the resilient member 55, the resilient member 55 is compressed, and the pressure relief valve 53 ' moves to a closed position in which the gas outlet chamber 216 is not in communication with the gas outlet port 52 '.

As the gas in the outlet chamber 216 gradually flows to the reset chamber 215, the pressure of the gas in the outlet chamber 216 decreases, and the pressure of the gas in the reset chamber 215 increases; when the gas pressure in the reset chamber 215 reaches a preset value capable of driving the first piston 23 to reset, the force applied by the elastic member 55 to the relief valve 53 'is designed to be greater than the gas pressure received by the relief valve 53' from the gas outlet chamber 216. In this manner, the relief valve 53 ' will move to the open position with the second projection 531 ' away from the first projection 512 ', and the outlet chamber 216 will be vented to atmosphere.

Referring to fig. 10a, 10b and 12, due to the action of the pressure relief mechanism 5', the high pressure gas in the air outlet cavity 216 is relieved to atmospheric pressure level, and the gas in the reset cavity 215 enters the interior of the cylinder 22 through the through hole 221, pushing the first piston 23 to move toward the air outlet end 212, and finally completing the reset of the first piston 23.

In a possible embodiment, the air nailer further comprises a control unit. The control unit can control the pressure relief valve to switch between the open position and the closed position based on the gas pressure in the reset chamber. Specifically, the control unit comprises a controller and a sensor for measuring the gas pressure in the reset cavity; when the gas pressure in the reset cavity measured by the sensor is smaller than a preset value, the controller controls the pressure release valve to be located at a closing position; when the gas pressure value in the reset cavity measured by the sensor is larger than a preset value, the controller controls the pressure relief valve to be located at the opening position.

In summary, the following steps: through setting up the first air current channel that is used for communicateing the chamber and giving vent to anger the chamber that resets, when accomplishing the nailing operation, when loosening the trigger, high-pressure gas in the first variable cavity can be via opening, perforating hole, first air current channel flow to the intracavity that resets in proper order, prepares for the restoration of first piston.

By arranging the pressure relief mechanism, when the first piston moves to the second extreme position and the balance valve moves to the second position, and gas in the cylinder body enters the gas outlet cavity, the gas outlet cavity is not communicated with the atmosphere by the pressure relief mechanism, and the gas in the gas outlet cavity can flow to the reset cavity to prepare for resetting of the first piston; when the pressure of the gas in the reset cavity reaches a preset value and is enough to drive the first piston to reset, the pressure relief mechanism enables the gas outlet cavity to be communicated with the atmosphere, and the gas in the reset cavity can enter the cylinder body through the through hole to drive the first piston to reset. Therefore, high-pressure gas for driving the first piston to nail can enter the reset cavity through the first gas flow channel and then drive the first piston to reset, and the utilization efficiency of the high-pressure gas is improved; therefore, only less gas is consumed to realize nailing work, the overall volume and weight of the air nail gun are reduced while energy is saved, and the air nail gun is light and portable.

The features of the above-described embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above-described embodiments are not described, but should be construed as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.

The above embodiments are only intended to illustrate some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A pneumatic nailer, comprising:

the shell is provided with a nail outlet end and an air outlet end which are oppositely arranged; the shell comprises a handle cavity communicated with an air source, a high-pressure cavity communicated with the handle cavity, a balance cavity, a reset cavity and an air outlet cavity;

the cylinder assembly is accommodated in the shell and comprises a cylinder body and a first piston; one end of the cylinder body is provided with an opening, and the other end of the cylinder body is connected with the nail outlet end; the first piston moves in the cylinder body and is provided with a first limit position far away from the nail outlet end and a second limit position close to the nail outlet end;

the balance valve is movably arranged in the shell and is provided with a through hole, and the balance valve is at least provided with two positions; in a first position, the balancing valve separates the opening from the outlet chamber, the opening communicating with the high pressure chamber; in the second position, the balance valve separates the opening from the high-pressure cavity, and the opening is communicated with the air outlet cavity through the through hole;

the gas nail gun also comprises a first gas flow channel for communicating the reset cavity and the gas outlet cavity, and gas can only flow from the gas outlet cavity to the reset cavity in the first gas flow channel;

the gas nail gun also comprises a pressure relief valve, and the pressure relief valve is used for opening or closing the gas outlet cavity; when the first piston moves to the second limit position and the balance valve moves to the second position, the gas in the cylinder body flows to the gas outlet cavity through the opening and the through hole; the pressure relief valve is closed, and the gas flows from the gas outlet cavity to the reset cavity through the first gas flow channel; when the gas pressure in the reset cavity reaches a preset value, the pressure release valve is opened, and the gas outlet cavity is communicated with the atmosphere.

2. The nailer of claim 1, wherein said pressure relief valve is movably disposed in said housing and has a first end surface located in said air outlet cavity; and under the action of the gas in the gas outlet cavity, the pressure release valve moves to the position for closing the gas outlet cavity.

3. The air nailer of claim 2, further comprising a pressure relief chamber in communication with said air outlet chamber, said pressure relief valve having a second end surface located within said pressure relief chamber, said pressure relief valve being movable to a position to open said air outlet chamber by gas from said pressure relief chamber; the effective area of the first end surface is smaller than that of the second end surface.

4. The air nailer of claim 3, wherein the pressure relief cavity communicates with the air outlet cavity through a second air flow passage having a radial dimension less than a radial dimension of the first air flow passage.

5. The nailer of claim 3, wherein said pressure relief valve includes a pressure relief valve body and a second piston, said second piston being located within said pressure relief chamber; one end of the pressure relief valve body is positioned in the air outlet cavity and is provided with the first end face; the other end of the pressure relief valve body is positioned in the pressure relief cavity and is connected with the second piston; the effective area of the second end face is equal to the sum of the area of the end face of the pressure relief valve body located in the pressure relief cavity and the area of the end face of the second piston.

6. The nailer of claim 5, wherein said pressure relief valve body defines a second air flow passage therethrough, said pressure relief cavity communicating with said air outlet cavity through said second air flow passage.

7. The nailer of claim 2, further comprising a first housing coupled to the venting end, a resilient member disposed between the first housing and the relief valve, the resilient member providing a force urging the relief valve toward a position opening the venting chamber.

8. The air nailer of claim 1, further comprising a control unit; the control unit comprises a controller and a sensor; the sensor is used for measuring the gas pressure in the reset cavity; and the controller controls the pressure relief valve to be closed or opened according to the gas pressure of the reset cavity.

9. The air nailer of claim 1, further comprising a seal disposed on the housing, the seal abutting the through bore to separate the opening from the air exit cavity in the first position.

10. The air nailer of claim 1, further comprising a switch assembly including a switch cavity in communication with the balance cavity, and a trigger movable within the switch cavity, the trigger moving to either place the switch cavity in communication with the handle cavity or place the switch cavity in communication with the atmosphere.

11. The air nailer of claim 1, wherein a one-way valve is disposed within the first air flow passage.

12. A pneumatic nailer, comprising:

the gas nail gun also comprises a pressure relief valve, and the pressure relief valve is used for opening or closing the gas outlet cavity; when the first piston moves to the second limit position and the balance valve moves to the second position, the gas in the cylinder body flows to the gas outlet cavity through the opening and the through hole; the pressure relief valve is closed, and the gas flows from the gas outlet cavity to the reset cavity through the first gas flow channel; when the gas pressure in the reset cavity is equal to the gas pressure in the gas outlet cavity, the pressure release valve is opened, and the gas outlet cavity is communicated with the atmosphere.

13. A pneumatic nailer, comprising: the shell is provided with a nail outlet end and an air outlet end which are oppositely arranged; the shell comprises a handle cavity communicated with an air source, a high-pressure cavity communicated with the handle cavity, a balance cavity, a reset cavity, an air outlet cavity and a switch assembly;

the cylinder assembly is accommodated in the shell and comprises a cylinder body and a first piston; one end of the cylinder body is provided with an opening, and the other end of the cylinder body is connected with the nail outlet end; the first piston moves in the cylinder body and is provided with a first limit position far away from the nail outlet end and a second limit position close to the nail outlet end; the cylinder body is also provided with a through hole;

when the balance valve moves to the first position, the gas in the high-pressure cavity enters the interior of the cylinder body through the opening, the first piston is pushed to move towards the second limit position, and the gas pressure for pushing the first piston to move in the cylinder body at the moment is defined as nailing pressure;

when the first piston moves to the second limit position and the balance valve moves to the second position, gas in the reset cavity enters the cylinder body through the through hole, the first piston is pushed to move towards the first limit position, and the gas pressure for pushing the first piston to move in the cylinder body at the moment is defined as reset pressure;

the nailing pressure > the resetting pressure.

14. The air nailer of claim 13, wherein the air nailer includes a first air flow passage communicating the air outlet chamber with the reset chamber; the gas can only flow from the gas outlet cavity to the reset cavity in the first gas flow channel.

15. The nailer of claim 14, wherein when the first piston moves to the second extreme position and the counterbalance valve moves to the second position, gas within the cylinder flows to the reset chamber via the opening, the gas exit chamber, and the first gas flow passage.