WO2021139752A1

WO2021139752A1 - Air nailer

Info

Publication number: WO2021139752A1
Application number: PCT/CN2021/070813
Authority: WO
Inventors: 刘贵文; 毋宏兵; 徐刚
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2020-01-10
Filing date: 2021-01-08
Publication date: 2021-07-15

Abstract

The invention relates to an air nailer, comprising: a housing, a cylinder assembly, and a balance valve (25). The housing further comprises a handle cavity (11), a high-pressure cavity (213), a balance cavity (214), a reset cavity (215), and an air discharge cavity (216). The balance valve (25) is movably provided between the balance cavity (214) and the high-pressure cavity (213), and has at least two positions. In a first position, an opening (224) of a cylinder body communicates with the high-pressure cavity (213), and the opening (224) of the cylinder body is isolated from the air discharge cavity (216). In a second position, the opening (224) is isolated from the high-pressure cavity (213), and the interior of the cylinder body communicates with the air discharge cavity (216) via the opening (224). A first air flow channel (7) used to communicate with the reset cavity (215) and the air discharge cavity (216) is further provided on the air nailer. After nailing is completed, high-pressure air in the cylinder body flows into the reset cavity (215) via the air discharge cavity (216) and the first air flow channel (7) to prepare for piston reset. Compared with the prior art, no additional high-pressure air needs to be provided to the reset cavity, and the high-pressure air used to reset the piston is the same high-pressure air for driving the piston to perform nailing, thereby improving an air utilization rate.

Description

Air Nail Gun

This application claims the priority of the application date of January 10, 2020, the application numbers of 202010027515.6 and 202010027512.2 Chinese patent applications, the entire contents of which are incorporated into this application by reference.

Technical field

The invention relates to an air nail gun, which belongs to the technical field of pneumatic tools.

Background technique

Currently on the market, the gas nail gun is connected to an external gas source. The high pressure gas from the external gas source is divided into two parts after entering the gas nail gun. One part is used to implement the nailing action, and the other part is used to reset the piston and use the gas. The rate is low. In addition, the gas nail gun in the prior art has at least two sets of through holes on the cylinder in the front and back direction. When the piston moves between the two sets of through holes, the high pressure gas enters the reset chamber from the through hole on the rear side. , Thereby weakening the power of the piston movement; at the same time, the high-pressure gas in the reset cavity will enter the cylinder from the through hole on the front side, located in front of the piston, which in turn increases the resistance to the forward movement of the piston. In order to ensure the nailing strength, the technical nail gun has to increase the bore of the cylinder.

Summary of the invention

The purpose of the present invention is to provide an air nail gun, which can reuse the high-pressure gas used for nailing, save energy, and reduce the volume and weight of the overall device, which is light and portable.

In order to achieve the above object, the present invention provides the following technical solutions: an air nail gun, the air nail gun includes: a housing with a nail exit end and an air exit end disposed oppositely; the housing includes a housing for communicating with an air source The handle cavity, the high pressure cavity connected with the handle cavity, the balance cavity, the reset cavity, and the air outlet cavity; the cylinder assembly is housed in the housing, the cylinder assembly includes a cylinder and a first piston; one end of the cylinder is provided There is an opening, and the other end is connected with the nail exit; the first piston moves in the cylinder and has a first limit position away from the nail exit end and a second limit position close to the nail exit end; The cylinder body is also provided with a through hole; a balance valve, housed in the housing, is provided with a through hole, the balance valve is movably arranged between the high pressure chamber and the balance chamber, and has at least two positions; In the first position, the balance valve separates the opening from the outlet chamber, and the opening is in communication with the high pressure chamber; in the second position, the balance valve separates the opening from the high pressure chamber The opening is communicated with the air outlet cavity through the through hole; the gas nail gun further includes a first air flow channel that communicates the reset cavity and the air outlet cavity, and the gas is only in the first air flow channel. It can flow from the gas outlet cavity to the reset 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 passes through the opening, The through hole, the air outlet cavity, and the first air flow channel flow to the reset cavity; and, when the air outlet cavity is in communication with the atmosphere, the gas in the reset cavity flows into the cylinder through the through hole Internally, the first piston is driven to move toward the first extreme position.

In one of the embodiments, the gas nail gun further includes a pressure relief valve having an open position that allows the air outlet chamber to communicate with the atmosphere, and a closed position where the air outlet chamber is not communicated with the atmosphere .

In one of the embodiments, when the gas pressure in the reset chamber reaches a preset value, the pressure relief valve is switched from the closed position to the open position.

In one of the embodiments, when the gas in the cylinder flows to the reset cavity through the opening, the through hole, the air outlet cavity and the first air flow channel, and the gas pressure in the reset cavity is equal to When the gas pressure in the gas outlet cavity is equal, the pressure relief valve is switched from the closed position to the open position.

In one of the embodiments, the pressure relief valve is movably arranged in the housing and has a first end surface located in the gas outlet cavity; under the action of the gas in the gas outlet cavity, the pressure relief valve faces the The closed position movement.

In one of the embodiments, the gas nail gun further includes a pressure relief chamber communicating with the air outlet cavity, and the pressure relief valve has a second end surface located in the pressure relief cavity, Under the action of gas, the pressure relief valve moves to the open position; the effective area of the first end surface is smaller than the effective area of the second end surface.

In one of the embodiments, the pressure relief chamber communicates with the outlet cavity through a second air flow channel, and the radial size of the second air flow channel is smaller than the radial size of the first air flow channel.

In one of the embodiments, the pressure relief valve includes a pressure relief valve body and a second piston, the second piston is located in the pressure relief cavity; one end of the pressure relief valve body is located in the air outlet cavity, Has the first end surface; the other end of the pressure relief valve body is located in the pressure relief cavity and is connected to the second piston; the effective area of the second end surface is equal to that where the pressure relief valve body is located The sum of the area of the end face in the pressure relief chamber and the area of the end face of the second piston.

In one of the embodiments, the pressure relief valve body is provided with a second air flow channel through it, and the pressure relief cavity and the air outlet cavity are communicated with the second air flow channel.

In one of the embodiments, the gas nail gun further includes a first housing connected to the air outlet, an elastic member is provided between the first housing and the pressure relief valve, and the elastic member provides The force that urges the pressure relief valve to move to the open position.

In one of the embodiments, the gas nail gun further includes a control unit; the control unit includes a controller and a sensor; the sensor is used to measure the gas pressure in the reset cavity; the controller is based on the reset The gas pressure in the cavity controls the pressure relief valve to switch between the open position and the closed position.

In one of the embodiments, the switch assembly includes a switch cavity communicating with the balance cavity, and a trigger movable in the switch cavity, and the trigger moves so that the switch cavity communicates with the handle cavity , Or make the switch cavity communicate with the atmosphere.

In one of the embodiments, a one-way valve is provided in the first air flow channel.

In order to achieve the above objective, another solution of the present invention is: an air nail gun, the air nail gun includes: a housing with a nail outlet end and an air outlet end disposed oppositely; The handle cavity communicated with the source, the high pressure cavity, the balance cavity, and the air outlet cavity communicated with the handle cavity; the cylinder assembly is housed in the housing, the cylinder assembly includes a cylinder body and a first piston; one end of the cylinder body is provided with The other end is connected to the nail exiting end; the first piston moves in the cylinder and has a first limit position far away from the nail exit end and a second limit position close to the nail exit end; The cylinder body is also provided with a through hole; a balance valve is movably arranged in the housing and is provided with a through hole. The balance valve has at least two positions; in the first position, the balance valve connects the opening with the The outlet air cavity is separated, and the opening is in communication with the high pressure cavity; in the second position, the balance valve separates the opening from the high pressure cavity, and the opening is connected to the outlet cavity through the through hole When the balance valve moves to the first position, the gas in the high-pressure chamber flows to the inside of the cylinder through the opening, driving the first piston to move toward the second extreme position; define this The gas that drives the first piston toward the second piston is nailing gas; the gas nail gun further includes a reset cavity configured to receive the nailing gas; and, The nailing gas in the reset cavity enters the inside of the cylinder through the through hole, and drives the first piston to move toward the first limit position.

In order to achieve the above objective, another solution of the present invention is: an air nail gun, the air nail gun includes: a housing with a nail outlet end and an air outlet end disposed oppositely; The handle cavity communicated with the source, the high pressure cavity, the balance cavity, the reset cavity and the air outlet cavity that are connected to the handle cavity; the cylinder assembly is housed in the housing, the cylinder assembly includes a cylinder and a first piston; One end is provided with an opening, and the other end is connected to the nail output end; the first piston moves in the cylinder and has a first limit position away from the nail output end and a second limit position close to the nail output end The balance valve is movably arranged in the housing and is provided with a through hole, the balance valve has at least two positions; in the first position, the balance valve separates the opening from the outlet cavity, the The opening is in communication with the high-pressure chamber; in the second position, the balance valve separates the opening from the high-pressure chamber, and the opening is in communication with the outlet chamber through the through hole; the gas nail gun is also It includes a first airflow channel for communicating the reset cavity and the air outlet cavity, and the gas in the first airflow channel can only flow from the air outlet cavity to the reset cavity; the gas nail gun also includes a pressure relief The pressure relief valve is used to open or close the air outlet cavity; when the first piston moves to the second limit position and the balance valve moves to the second position, the inside of the cylinder The gas flows through the opening, and the through hole flows to the gas outlet cavity; the pressure relief valve is closed, and the gas flows from the gas outlet cavity to the reset cavity via the first air flow channel; when the gas flows into the reset cavity The gas pressure reaches a preset value, the pressure relief valve is opened, and the gas outlet chamber is in communication with the atmospheric pressure.

In one of the embodiments, the air nail gun further includes a sealing element provided on the housing, and in the first position, the sealing element abuts the through hole to connect the opening with The air outlet cavity is separated.

In order to achieve the above objective, another solution of the present invention is: an air nail gun, the air nail gun includes: a housing with a nail outlet end and an air outlet end disposed oppositely; The handle cavity communicated with the source, the high pressure cavity, the balance cavity, the reset cavity and the air outlet cavity that are connected to the handle cavity; the cylinder assembly is housed in the housing, the cylinder assembly includes a cylinder and a first piston; One end is provided with an opening, and the other end is connected to the nail output end; the first piston moves in the cylinder and has a first limit position away from the nail output end and a second limit position close to the nail output end The balance valve is movably arranged in the housing and is provided with a through hole, the balance valve has at least two positions; in the first position, the balance valve separates the opening from the outlet cavity, the The opening is in communication with the high-pressure chamber; in the second position, the balance valve separates the opening from the high-pressure chamber, and the opening is in communication with the outlet chamber through the through hole; the gas nail gun is also It includes a first airflow channel for communicating the reset cavity and the air outlet cavity, and the gas in the first airflow channel can only flow from the air outlet cavity to the reset cavity; the gas nail gun also includes a pressure relief The pressure relief valve is used to open or close the air outlet cavity; when the first piston moves to the second limit position and the balance valve moves to the second position, the cylinder body The gas flows through the opening, the through hole flows to the gas outlet cavity; the pressure relief valve is closed, and the gas flows from the gas outlet cavity to the reset cavity via the first air flow channel; when the reset cavity When the gas pressure inside is equal to the gas pressure in the gas outlet cavity, the pressure relief valve is opened, and the gas outlet cavity is in communication with the atmospheric pressure.

In order to achieve the above objective, another solution of the present invention is: an air nail gun, the air nail gun includes: a housing with a nail outlet end and an air outlet end disposed oppositely; The handle cavity communicated with the source, the high pressure cavity connected with the handle cavity, the balance cavity, the reset cavity, the air outlet cavity, and the switch assembly; the cylinder assembly is housed in the housing, the cylinder assembly includes a cylinder block and a first piston; One end of the cylinder is provided with an opening, and the other end is connected to the nail output end; the first piston moves in the cylinder and has a first limit position away from the nail output end and a first end close to the nail output end. Two extreme positions; the cylinder is also provided with a through hole; a balance valve is movably arranged in the housing with a through hole, the balance valve has at least two positions; in the first position, the balance valve Separate the opening from the air outlet cavity, the opening communicates with the high-pressure cavity; in the second position, the balance valve separates the opening from the high-pressure cavity, and the opening passes through the through The hole communicates with the air outlet cavity; when the balance valve moves to the first position, the gas in the high pressure cavity enters the cylinder through the opening, pushing the first piston toward the second limit Position movement defines that the pressure of the gas pushing the first piston in the cylinder at this time is the nailing pressure; when the first piston moves to the second limit position and the balance valve moves to the first In the second position, the gas in the reset cavity enters the cylinder through the through hole, pushing the first piston toward the first extreme position, which defines that the cylinder pushes the first The gas pressure of the piston movement is the reset pressure; the nailing pressure>the reset pressure.

In one of the embodiments, the gas nail gun includes a first airflow channel connecting the air outlet cavity and the reset cavity; gas in the first airflow channel can only flow from the air outlet cavity to the reset Cavity.

By providing a first air flow channel connecting the reset cavity and the air outlet cavity, when the nailing operation is completed and the trigger is released, at least part of the high-pressure gas in the first variable cavity cavity can enter through the through hole and the first air flow channel in sequence Into the reset cavity, prepare for the reset of the first piston, thereby improving the utilization rate of high-pressure gas.

The pressure relief mechanism provided with a pressure relief valve assembly, a pressure relief cavity and an exhaust port allows the outlet cavity to be selectively communicated with the atmosphere; when the high pressure gas inside the cylinder flows to the outlet cavity through the through hole, the pressure relief valve assembly Close the communication between the exhaust port and the gas outlet cavity, the gas outlet cavity is not connected to the atmosphere, and the high pressure gas in the gas outlet cavity can be delivered to the reset cavity through the first air flow channel; when the reset cavity is filled with high pressure gas, the high pressure in the pressure cavity is relieved The gas will drive the pressure relief valve assembly to move, so that the exhaust port is connected with the gas outlet cavity, the high pressure gas in the gas outlet cavity can be released through the exhaust port, and the high pressure gas in the reset cavity can enter the inside of the cylinder, pushing the first piston to reset . As a result, the high-pressure gas used to drive the first piston to drive nails can enter the reset cavity through the first air flow channel, and then drive the first piston to reset, which improves the utilization efficiency of high-pressure gas; thus, it only needs to consume less gas. The nailing work saves energy while reducing the overall volume and weight of the air nail gun, making it light and portable.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it in accordance with the content of the description, the preferred embodiments of the present invention are described in detail below with the accompanying drawings.

Description of the drawings

Fig. 1 is a schematic diagram of the state of the air nail gun in the prior art after the handle cavity is inflated, and the balance valve moves to the second position.

Fig. 2 is a schematic diagram of a state in which the balance valve of the air nail gun shown in Fig. 1 moves to a first position after the trigger is pressed.

Fig. 3 is a schematic diagram of the air nail gun shown in Fig. 1 when the first piston moves to the second limit position and the nailing is completed.

Fig. 4 is a schematic diagram of the air nail gun shown in Fig. 1 after the trigger is released, the balance valve moves to the second position, and the first variable cavity releases pressure to the atmosphere.

Fig. 5 is a schematic diagram of a state in which the gas in the reset cavity acts on the first piston to reset to the first limit position of the gas nail gun in the prior art.

Fig. 6 is a schematic diagram of a state in which the balance valve of the gas nail gun according to the first embodiment of the present invention moves to a second position after the handle cavity is inflated.

Fig. 7 is a schematic diagram of a state in which the balance valve of the air nail gun shown in Fig. 6 moves to a first position after the trigger is pressed.

Fig. 8 is a schematic diagram of the air nail gun shown in Fig. 6 when the first piston moves to the second limit position and the nailing is completed.

Fig. 9 is a schematic diagram of the air nail gun shown in Fig. 6 after the trigger is released, the balance valve moves to the second position, the outlet cavity is inflated by the reset cavity and the outlet cavity is not connected to the atmosphere.

Fig. 10a is a schematic diagram of the air nail gun shown in Fig. 6 when the pressure relief valve moves until the air outlet cavity is in communication with the atmosphere, and Fig. 10b is a partial enlarged view of the pressure relief valve.

Fig. 11 is a schematic diagram of the gas nail gun shown in Fig. 6 in which the gas in the reset cavity acts on the first piston to reset it to the first limit position.

Fig. 12 is a cross-sectional view of an air nail gun according to a second embodiment of the present invention, which relates to a pressure relief mechanism.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within 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", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation or a specific orientation. The structure and operation cannot therefore be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense unless otherwise clearly specified and limited. For example, they can be fixed or detachable. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood in specific situations.

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

Please refer to Figures 1 to 5, which show an air nail gun 100 in the prior art, which can be used in the connection of wooden structures of houses, wooden furniture and other wooden structures, etc., and will not be applied here. The scene is specifically limited.

The air nail gun 100 includes a housing and a switch assembly 3; the housing includes a handle 1 for holding and a main body 2 connected with the handle 1 to realize a nailing action. The housing also includes a handle cavity 11 communicating with an air source, a high pressure cavity 213 communicating with the handle cavity 11, a balance cavity 214, a reset cavity 215, and an air outlet cavity 216 communicating with the atmosphere.

The handle portion 1 includes the aforementioned handle cavity 11 and an air inlet 12 arranged on one side of the handle cavity 11 to connect the handle cavity 11 with an external air source. The external air source may be an air pump or other device to connect the handle through the air inlet 12 High-pressure gas is delivered in the cavity 11.

In this embodiment, in the height direction of the air nail gun 100, the air inlet 12 is provided at the bottom of the handle 1, which not only improves the overall aesthetics, but also facilitates the user's operation and use. It is true that in other embodiments, the air inlet 12 may also be provided at other positions of the handle portion 1, which is not specifically limited here, and depends on actual conditions.

The main body 2 includes a nail-out end 211 and an air-out end 212 opposite to each other, a cylinder assembly provided in the main body 2, a balance valve 25 provided in the main body 2, and a striker 24 penetrating the nail end 211.

The cylinder assembly includes a cylinder body 22, a first piston 23 that is housed in the cylinder body 22 and divides the cylinder body 22 into a first variable cavity 222 and a second variable cavity 223, and the striker 24 is connected to the first piston 23. The first piston 23 can reciprocate in the cylinder 22, and has a first limit position far away from the nail-out end 211, as shown in Figs. 1, 5, and a second limit position close to the nail-out end 211, as shown in Figs. 3 and 4 Shown. In order to prevent the impact force generated by the reciprocating movement of the first piston 23 in the cylinder 22 from being too large to cause damage to the nail output end 211, a buffer block 26 is also provided between the cylinder 22 and the nail output end 211 to slow down the The force generated by a piston 23 on the nail output end 211. The first piston 23 has a first inclined surface (not labeled), and the buffer block 26 has a second inclined surface (not labeled). When the first piston 23 and the buffer block 26 collide, there is a gap between the first inclined surface and the second inclined surface. The gap allows the high-pressure gas in the reset cavity 215 (the reset cavity 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 output end 211.

It should be noted that the first variable cavity 222 and the second variable cavity 223 exist corresponding to the non-limiting position of the first piston 23. When the first piston 23 is located at the first limit position, the first piston 23 is flush with one end of the cylinder 22, as shown in FIG. 1, at this time, the first variable cavity 222 does not exist. When the first piston 23 moves to the aforementioned second limit position, the first piston 23 abuts against the buffer block 26, as shown in FIG. 3, at this time, the second variable cavity 223 basically does not exist. The cylinder 22 is provided with the aforementioned high pressure chamber 213 and the reset chamber 215, 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 can be a structure such as a partition. In order to enhance the sealing performance between the high-pressure chamber 213 and the reset chamber 215, a sealing ring is also provided on the partition 27.

The switch assembly 3 includes the aforementioned switch cavity 31 and a trigger 32 movable in the switch cavity 31. The air nail gun 100 further includes a fourth airflow channel 253 and a fifth airflow channel 33. The balance cavity 214 and the switch cavity 31 are communicated through the fourth airflow channel 253, the handle cavity 11 and the switch cavity 31 are communicated through the fifth airflow channel 33, and the trigger 32 Move to make the balance cavity 214 communicate with the handle cavity 11 through the switch cavity 31, as shown in FIGS. 1 and 4, or make the balance cavity 214 communicate with the atmosphere through the switch cavity 31, as shown in FIGS.

The switch assembly 3 also includes a return spring 34 for connecting the switch chamber 31 and the trigger 32. In its natural state, the return spring 34 makes the trigger 32 in the initial state, and the switch chamber 31 communicates with the handle chamber 11; applying an external force to the trigger 32 makes the trigger 32 moves, at this time the return spring 34 is compressed, and the switch chamber 31 is in communication with the outside atmosphere; after removing the external force, the trigger 32 returns to the initial state under the action of the elastic force of the return spring 34.

The balance valve 25 is movably arranged between the balance chamber 214 and the high pressure chamber 213, and a through hole 252 is opened thereon. Under the combined action of the gas in the balance chamber 214 and the gas in the high pressure chamber 213, the balance valve 25 has at least two positions. In this embodiment, a first elastic member 251 is also provided in the balance cavity 214. The force received at the left end of the balance valve 25 is the sum of the force of the first elastic member 251 and the force of the gas in the balance chamber 214, and the force received at the right end of the balance valve 25 is the force of the gas in the high pressure chamber 213. In the first position, the balance valve 25 abuts against the air outlet 212, as shown in FIGS. 2 and 3. At this time, the opening 224 is in communication with the high pressure chamber 213, and the opening 224 is separated from the air outlet chamber 216. In the second position, the balance valve 25 abuts the opening 224, as shown in FIGS. 1 and 4, at this time, 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 labeled) is further provided between the balance valve 25 and the air outlet 212, so that the balance cavity 214 and the air outlet cavity 216, and the balance cavity 214 and the high pressure cavity 213 are not connected.

Referring to FIG. 3, when the trigger 32 is pressed, the balance chamber 214 communicates with the atmosphere through the switch chamber 31; at this time, the balance chamber 214 is at atmospheric pressure, and the high pressure chamber 213 is filled with high pressure gas. The force received at the left end of the balance valve 25 is less than the force received at the right end of the balance valve 25. The balance valve 25 moves to the left and abuts against the outlet end 212; at this time, the high pressure gas in the high pressure chamber 213 flows into the first variable through the opening 224 The cavity cavity 222 pushes the first piston 23 to move toward the second extreme position to complete the nailing operation.

A hole is opened on the nail output end 211. The striker 24 penetrates the nail end 211 through the hole and is connected to the external nail magazine. The first piston 23 reciprocates to drive the striker 24 to reciprocate to generate an impact force to move the nail magazine. The nails are pushed out of the nail bin.

Referring to FIG. 3, the reset cavity 215 is arranged on the periphery of the cylinder 22, and the cylinder 22 is also provided with two sets of through holes 221 for communicating the reset cavity 215 with the inside of the cylinder 22. The through hole 221 includes a through hole 221a and a through hole 221b arranged in the front-rear direction. When the first piston 23 moves toward the nail outlet 211 under the action of high pressure gas, part of the high pressure gas in the first variable cavity 222 will enter the reset cavity 215 through the through hole 221a, and finally make the reset cavity 215 full of 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 one side of the nail end 211, it also penetrates the side of the cylinder 22 close to the nail end 211. The hole allows the second variable cavity 223 to communicate with the outside; and the existence of the through hole 221b , So that the reset cavity 215 can communicate with the second variable cavity 223, but the diameter of the hole is much smaller than the diameter of the through hole 221b, so that when the high pressure gas in the reset cavity 215 enters the second variable cavity 223 At that time, the high-pressure gas will not directly escape from the hole.

When the nailing operation is completed, the trigger 32 is released, and the trigger 32 returns to the initial state under the action of the return spring 34, as shown in FIG. 4. At this time, the balance cavity 214 communicates with the handle cavity 11 again through the switch cavity 31, and the balance cavity 214 receives high pressure gas from the handle cavity 11; under the combined action of the high pressure gas in the balance cavity 214 and the elastic member 251, the balance valve 25 Move toward the nail outlet 211; the balance valve 25 moves to abut 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; The high-pressure gas will communicate with the gas outlet cavity 216 through the through hole 252; since the gas outlet cavity is connected to the atmosphere, the air pressure in the first variable cavity 222 is rapidly reduced to the atmospheric pressure level. At this time, the left end of the first piston 23 receives the force of the atmosphere, and the right end of the first piston 23 receives the force of the high-pressure gas from the reset chamber 215. The first piston 23 will move toward the air outlet 212 and move to the first limit. Position, complete the reset operation.

In order to explain the working principle of the gas nail gun 100 more clearly, a complete description of the nailing of the first piston 23 and the resetting process of the first piston 23 will be given below with reference to FIGS. 1-5. Here, the atmospheric pressure is named P ₀ , the gas pressure in the balance chamber 214 is P ₁ , the gas pressure in the reset chamber 215 is P ₂ , and the gas pressure in the high pressure chamber 213, that is, the working pressure of the gas source gas is P ₃ , where P ₃ >P ₀ .

FIG. 1 shows an initial state diagram of the air nail gun 100. At this time, the first piston 23 is located at the first limit position, that is, the first piston 23 is located on the side of the cylinder 22 farthest from the nail outlet 211; the trigger 32 is located at its initial position, and the switch chamber 31 is in communication with the handle chamber 11. When high-pressure gas is delivered to the handle cavity 11 through an external gas source, both the high-pressure cavity 213 and the balance cavity 214 contain high-pressure gas, that is, P ₁ =P ₃ . However, considering the effective force-receiving area of the left and right ends of the balance valve 25 and the existence of the elastic member 251, the balance valve 25 moves to the right to abut the opening 224 of the cylinder 22; at this time, the high-pressure chamber 213 and the opening 224 are separated , The gas in the high pressure chamber 213 cannot enter the cylinder 22.

Please refer to Figure 2, press the trigger 32, the balance chamber 214 is connected to the outside atmosphere through the switch chamber 31, and the balance chamber 214 is quickly released to P ₁ =P ₀ ; at this time, the high pressure gas still enters the high pressure chamber 213 from the handle chamber 11, _{The gas pressure P 3 in the} high-pressure chamber 213> the gas pressure P ₁ in the balance chamber 214. The force of the high-pressure gas in the high-pressure chamber 213 on the balance valve 25 will be greater than the sum of the forces of the gas in the balance chamber 214 and the elastic member 251, and balance The valve 25 moves to the outlet end 212 until the balance valve 25 abuts against the outlet end 212; at this time, the through hole 252 is in contact with the seal 28, and the opening 224 is separated from the outlet cavity 216; the opening 224 is connected to the high pressure cavity 213, and the high pressure cavity The high-pressure gas in the 213 enters the first variable cavity 222 through the opening 224, and pushes the first piston 23 to move toward the second extreme position.

Please refer to FIG. 3, the trigger 32 is still in a pressed state. That is, the balance chamber 214 communicates with the external atmosphere. The high-pressure gas in the high-pressure chamber 213 pushes the first piston 23 to move toward the second extreme position to complete the nailing operation. Wherein, when the first piston 23 moves to the middle of the through

holes

221a and 221b, part of the high-pressure gas will enter the reset cavity 215 from the through hole 221a to inflate the reset cavity 215.

With reference to Figures 4 and 5, release the trigger 32, and the trigger 32 will return to the initial position. At this time, the balance cavity 214 communicates with the handle cavity 11 again through the switch cavity 31. That is, the high-pressure gas is reconnected to the balance chamber 214. The high-pressure gas enters the balance cavity 214 from the handle cavity 11 and the switch cavity 31, so that the gas pressure P _{1 in the} balance cavity 214 = the gas pressure P _{3 of the} high pressure cavity 213; the force of the balance valve 25 on the high pressure gas and the elastic member 251 The lower part abuts against the opening 224 again, and the high-pressure chamber 213 is separated from the opening 224. At this time, the first variable cavity 222 is in communication with the gas outlet cavity 216 through the through hole 252, so that the high pressure gas in the first variable cavity 222 is quickly released to atmospheric pressure. At this time, the gas in the reset cavity 215 will enter the cylinder 22 through the through hole 221b, drive the first piston 23 to move toward the gas outlet 212, and finally complete 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 inside of the cylinder 22 through the opening 224, and drives the first piston 23 to move toward the second extreme position to complete the operation. Nail operation. It is defined that the gas pressure used to drive the first piston 23 to move toward the second limit position in the cylinder 22 at this time is the nailing pressure, which is equal to the working pressure P3 of the air source; when the trigger 32 is released, the balance valve When 25 moves to the second position, the gas in the reset cavity 215 enters the inside of the cylinder 22 through the through hole 221b, and drives the first piston 23 to move toward the first extreme position to complete the reset operation. It is defined that the gas pressure used to drive the first piston 23 to move toward the first limit position in the cylinder 22 at this time is the reset pressure, which is equal to the working pressure P3 of the gas source.

It should be noted that when the gas in the reset cavity 215 enters the cylinder 22 from the through hole 221b, a small part of the gas will be discharged from the nail exit 211 to the outside due to the existence of the hole in the nail exit 211. However, the diameter of the hole of the nail end 211 is much smaller than the diameter of the second through hole 221b, so that the remaining gas is enough to drive the first piston 23 to reset.

It can be seen from the above-mentioned working principle of the gas nail gun 100 in the prior art that in order to drive the first piston 23 to reset, a part of high-pressure gas needs to be provided in the reset chamber 215, and the gas utilization efficiency is low. In addition, the air nail gun 100 in the prior art is provided with two sets of through holes—through holes 221a and through holes 221b—on the cylinder 22. Wherein, the through hole 221a is arranged close to the balance valve 25, and the through hole 221b is arranged close to the nail output end 211. When the first piston 23 moves between the through hole 221a and the through hole 221b, part of the high-pressure gas will enter the reset cavity 215 from the through hole 221a, which weakens the force of the high-pressure gas to push the first piston 23 to the nail output end 211; In addition, the high-pressure gas in the reset cavity 215 will also enter the second variable cavity cavity 223 through the through hole 221b, which hinders the advancement of the first piston 23. Therefore, in the prior art air nail gun, in order to ensure the nailing strength, the bore of the cylinder body 22 has to be increased.

Referring to Fig. 6, in order to improve the gas utilization efficiency, the gas nail gun 100' of the present invention is provided with a first gas flow channel 7 for communicating the gas outlet cavity 216 and the reset cavity 215. When the nailing operation is completed, the user releases the trigger 32, as shown in FIG. 9, the high-pressure gas in the first variable cavity 222 will flow to the reset cavity through the opening 224, the through hole 252, the air outlet cavity 216 and the first air flow channel 7. 215. Prepare for the resetting of the first piston 23. That is, in this embodiment, the part of the high-pressure gas in the reset chamber 215 that drives the first piston 23 to reset is part or all of the high-pressure gas previously used to drive the first piston 23 to complete the nailing operation. At the same time, only a set of through holes 221 are provided on the cylinder 22 for the gas in the reset cavity 215 to enter the inside of the cylinder 22. Therefore, unlike the prior art, which needs to provide high-pressure gas for driving the first piston 23 to nail and the first piston 23 to reset, this embodiment reuses the part of the gas that drives the first piston 23 to nail, which greatly improves Improve the efficiency of gas utilization.

Moreover, the gas in the first gas flow channel 7 is only allowed to flow from the gas outlet cavity 216 to the reset cavity 215. In a possible implementation manner, a one-way valve 71 is provided in the first air flow channel 7.

We know that to reset the first piston 23, one of the prerequisites is that the reset chamber 215 is filled with sufficient high-pressure gas, and the other prerequisite is that the high-pressure gas in the cylinder 22 can be released at the left end of the first piston 23. In the prior art, since the outlet cavity 216 is always in communication 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 cylinder 22 is used to drive The high-pressure gas nailed by the first piston 23 will flow to the outside atmosphere through the opening 224, the through hole 252, and the outlet cavity 216; in this way, the left end of the first piston 23 receives the force of the atmosphere, so that the high-pressure gas in the reset cavity 215 can be Enter the inside of the cylinder 22 through the through hole 221b, and push the first piston 23 to move toward the first extreme position to complete the nailing operation, as shown in FIG. 5.

However, in this embodiment, it is necessary to use the part of the high-pressure gas that drives the first piston 23 to drive the nails to realize the resetting of the first piston 23. For this reason, the outlet cavity 216 has an open state communicating with the atmosphere and a closed state not communicating 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 air flow channel 7, the air outlet chamber 216 is not connected to the atmosphere, as shown in FIG. When the reset chamber 215 is filled with high-pressure gas enough to reset the first piston 23, the outlet chamber 216 is in communication with the atmosphere, as shown in FIG. 10a.

To this end, the air nail gun 100' also includes a pressure relief mechanism 5 connected to the air outlet 212. The pressure relief mechanism 5 includes a pressure relief valve 53 for opening or closing the air outlet chamber. In this embodiment, referring to FIG. 7, the air outlet 212 is provided with a protruding portion 4, 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 cavity 511, an exhaust port 52 opened on the first housing 51 and communicating with the atmosphere, and used to connect the exhaust port 52 With the closed or open pressure relief valve 53, the first cavity 511 is connected to the outlet cavity 216.

In this embodiment, both the outer side of the protrusion 4 and the inner wall of the first housing 51 are provided with threads, and the first housing 51 and the protrusion 4 are threadedly connected.

It is true that in other embodiments, the connection between the first housing 51 and the protruding portion 4 may also be other, such as a snap connection, etc., which is not specifically limited here, and depends on the actual situation.

7-9, the inner wall of the first housing 51 is provided with a first protrusion 512, the relief valve 53 is provided with a second protrusion 531 that resists the first protrusion 512, the first protrusion 512 It is arranged on the side of the first housing 51 close to the air outlet 212, and the exhaust port 52 is arranged on the side of the first housing 51 away from the air outlet 212. More specifically, the second protrusion 531 is disposed on the pressure relief valve body 530 (the pressure relief valve body 530 will be described later).

The pressure relief valve 53 moves in the first cavity 511 to divide the first cavity 511 into a discharge cavity 514 communicating with the exhaust port 52 and a collecting cavity 513 communicating with the outlet cavity 216. When the first protrusion 512 is against the second protrusion 531, the air outlet chamber 216 is not connected to the exhaust port 52, and the high-pressure gas flows from the air outlet chamber 216 to the reset chamber 215 through the first air flow channel 7; When the ridge 512 is separated from the second protrusion 531, the gas outlet cavity 216 is connected to the gas outlet 52, and the high-pressure gas flows from the gas outlet cavity 216 to the gas outlet 52 and is discharged to the atmosphere.

The pressure relief mechanism 5 also includes a pressure relief chamber 611 having a second housing 61. A second air flow channel 532 is provided between the pressure relief cavity 611 and the air outlet cavity 216. The high pressure gas flows from the air outlet cavity 216 to the air outlet through the second air flow channel 532. Inside the pressure chamber 611.

The pressure relief valve 53 has a first end surface 533 arranged in the air outlet cavity 216 and a second end surface 534 arranged in the pressure relief cavity 611. Here, the effective area of the first end surface 533 is defined as the effective area of the first end surface 533 that is used on the first end surface 533 to bear the action of the gas in the outlet cavity 216 so that the pressure relief valve 53 has a tendency to move to the left; The effective area of the second end surface 534 is the effective area of the second end surface 534 in order to bear the action of the gas in the pressure relief chamber 611, so that the pressure relief valve 53 has a rightward movement tendency. Here, the gas in the outlet cavity 216 acts on the first end surface 533 of the pressure relief valve 53, which will cause the pressure relief valve 53 to move toward the position where the outlet cavity 216 is closed; the gas in the pressure relief cavity 611 acts on the pressure relief valve 53 The second end surface 534 will cause the pressure relief valve 53 to move toward the position where the air outlet chamber 216 is opened.

In this embodiment, as shown in FIG. 10 b, the effective area of the second end surface 534 of the pressure relief valve 53 is larger than the effective area of the first end surface 533. With this arrangement, when the pressure value of the gas in the pressure relief chamber 611 through the second air flow channel 532 and the gas outlet chamber 216 is equal, since the effective area of the second end surface 534 is larger than the effective area of the first end surface 533, the pressure relief valve 53 can face The direction of the air outlet 212 moves. Therefore, the second protrusion 531 of the pressure relief valve 53 is away from the first protrusion 512, the air outlet cavity 216 is communicated with the atmosphere through the air outlet 52, and the air outlet cavity 216 is opened.

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

In this embodiment, the end surface of the second piston 62 is flush with the end surface of the pressure relief valve body 530 in the pressure relief cavity 611. It is true that in other embodiments, the end surface of the second piston 62 and the end surface of the pressure relief valve body 530 in the pressure relief chamber 611 may also be arranged not flush, or the second piston 62 and the pressure relief valve body 530 may protrude to relieve pressure. The end of the cavity 611 is integrally formed, which is not specifically limited here, and it depends on the actual situation. In short. The pressure relief valve 53 has a first end surface 533 disposed in the air outlet cavity 216 and a second end surface 534 disposed in the pressure relief cavity 611, wherein the effective area of the second end surface 534 is larger than the effective area of the first end surface 533.

It should be noted that it takes time for the high-pressure gas to enter the pressure relief chamber 611 from the second air flow channel 532 until the pressure relief valve 53 is pushed toward the nail outlet 212, and this part of time is used to ensure that the reset cavity 215 can receive a sufficient amount. , The high-pressure gas enough to drive the first piston 23 to reset. In other words, only when the pressure of the gas from the outlet chamber 216 received by the reset chamber 215 reaches a preset value, the pressure relief valve 53 can move to connect the outlet chamber 216 with the atmosphere.

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

The second housing 61 is connected to the first housing 51, and the connection mode can be threaded connection, clamping connection, etc., which is not specifically limited here, and depends on actual conditions. In order to make the overall aesthetics and simplicity of the pressure relief mechanism 5, the second air flow channel 532 is provided through the pressure relief valve body 530.

Hereinafter, in conjunction with FIGS. 6 to 11, it will be described how the air nail gun 100' of this embodiment completes the nailing operation and the resetting operation.

How to nail the air nail gun 100' of this embodiment is similar to the prior art because of its working principle. Here, only a brief description. As shown in Figure 6, this is the initial stage of the nailing operation. The trigger 32 is not pressed, and the first piston 23 is located at the first extreme position. The balance valve 25 abuts the opening 224 of the cylinder 22 under the combined action of the high-pressure gas and the elastic member 251.

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

9 to 11 show process diagrams of how the first piston 23 is reset after the nailing operation is completed.

Please refer to Figure 9, loosen the trigger 32, the balance chamber 214 communicates with the handle chamber 11 through the switch chamber 31, and the balance chamber 216 is again filled with high-pressure gas; under the action of the high-pressure gas and the elastic member 251, the balance valve 25 moves right to and The opening 224 abuts; at this time, the opening 224 is separated from the high-pressure chamber 213, and the inside of the cylinder 22 communicates with the outlet chamber 216 through the opening 224. The high-pressure gas in the first variable cavity 222 enters the outlet chamber 216 through the through hole 252 Under the action of the high pressure gas in the outlet cavity 216, the pressure relief valve 53 moves to a position where the second protrusion 531 and the first protrusion 512 are resisted, and the outlet cavity 216 and the exhaust port 52 are not connected; the high pressure in the outlet cavity 216 A part of the gas flows into the reset cavity 215 through the first air flow channel 7 to inflate the reset cavity 215; the other part flows into the pressure relief cavity 611 through the second air flow channel 532 to prepare for pressure relief.

It should be noted that when the gas in the cylinder 22 passes through the opening 224 and the through hole 252 just enters the air outlet chamber 216, the high-pressure gas will not be able to enter the reset chamber 215 and the pressure relief chamber 611 in the future; at this time, the gas in the air outlet chamber 216 The gas pressure is the largest, which is basically equal to the working pressure P3 of the gas source. However, when the gas in the outlet cavity 216 enters the reset cavity 215 and the pressure relief cavity 611 through the first gas flow channel 7 and the second gas flow channel 532 respectively, the gas pressure of the gas outlet cavity 216 will decrease due to the increase of the space.

10a and 11, as mentioned above, the gas nail gun 100' is designed to release the pressure only when the gas pressure in the reset chamber 215 reaches the preset value, and the first piston 22 can be reset smoothly. The valve 53 can be moved to a position where the air outlet chamber 216 communicates with the atmosphere.

Specifically in this embodiment, when the high-pressure gas in the gas outlet chamber 216 no longer flows to the reset chamber 215, that is, when the gas pressure in the reset chamber 215 is equal to the gas pressure in the gas outlet chamber 216, the gas in the reset chamber 215 is sufficient to make The first piston 23 is reset. At this time, the gas pressure in the pressure relief chamber 611 is designed to be also equal to the gas pressure in the gas outlet chamber 216. However, since the effective area of the second end surface 534 of the pressure relief valve 53 is greater than the effective area of the first end surface 533, the pressure relief valve 53 will move toward the outlet end 212 until the second protrusion 531 is separated from the first protrusion 512. Position; thus the outlet cavity 216 is connected to the exhaust port 52, the high-pressure gas in the outlet cavity 216 is discharged to the atmosphere through the exhaust port 52, and the gas pressure in the outlet cavity 216 is also reduced to atmospheric pressure.

As the gas pressure at the left end of the first piston 23 drops to atmospheric pressure, the high-pressure gas in the reset chamber 215 will enter the cylinder 22 through the through hole 221 and push the first piston 23 toward the gas outlet 212 until the first The piston 23 returns to the first limit position to complete the reset operation, as shown in FIG. 11.

Before the next nailing operation, the pressure relief valve 53 will remain in an open position that allows the air outlet chamber 216 to communicate with the atmosphere.

As shown in Figure 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 will flow to the outlet cavity 216 through the opening 224 and the through hole 252; When the gas in the cavity 216 can flow to the reset cavity 215 and the pressure relief cavity 611 in the future, the pressure of the gas in the gas outlet cavity 216 is the largest, which is basically equal to the working pressure P3 of the gas source. As the high-pressure gas in the gas outlet cavity 216 starts to flow to the reset cavity 215 and the pressure relief cavity 611, the gas pressure in the gas outlet cavity 216 decreases, and the gas pressure in the reset cavity 215 and the pressure relief cavity 611 increases accordingly.

It is conceivable that the process of inflating the air outlet cavity 216 into the reset cavity 215 will end when there is no gas flow between the air outlet cavity 216 and the reset cavity 215. That is, the final result of the air outlet cavity 216 inflating the reset cavity 215 is that the gas pressure in the outlet cavity 216 is equal to the gas pressure in the reset cavity 215, which is also the maximum value that the gas pressure in the reset cavity 215 can reach. The greater the gas pressure in the reset chamber 215, the greater the power for the first piston 23 to reset. In this embodiment, in order to ensure the smooth reset of the first piston 23 most efficiently, 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 outlet chamber 216.

And we define the preset value as the gas pressure in the reset chamber 215 when the gas in the reset chamber 215 is sufficient to drive the first piston 23 to reset. In a possible implementation, 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 pressure relief valve 53 can be activated. For example, when the gas outlet chamber 216 is inflating the reset chamber 215, when the gas pressure in the reset chamber 215 reaches 60% 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. At this time, the preset value can be 60% of the gas pressure in the gas outlet cavity 216 at this time.

In this embodiment, by controlling the radial dimensions of the second air flow channel 532 and the first air flow channel 7 to ensure that the gas pressure in the reset chamber 215 has reached a preset value before the pressure relief valve 53 moves. Specifically, the radial size of the first air flow channel 7 is greater than the radial size of the second air flow channel 532.

In this embodiment, as shown in FIG. 8, the nailing pressure in the cylinder 22 for driving the first piston 23 to move toward the second extreme position is the working pressure P3 of the air source. When the pressure relief valve 53 is activated and the high pressure gas in the gas outlet chamber 216 is released to atmospheric pressure, the high pressure gas from the reset chamber 215 enters the inside of the cylinder 22 and drives the first piston 23 to move toward the first limit position to complete the reset operation. . At this time, in the cylinder 22, the reset pressure used to drive the first piston 23 to complete the reset is less than the working pressure P3.

In a possible implementation manner, as shown in FIG. 12, the pressure relief mechanism 5'includes: a first housing 51' connected to the air outlet 212, and a drain disposed on the first housing 51' and communicating with the atmosphere. The air port 52', the pressure relief valve 53' and the elastic member 55. Among them, one end of the elastic member 55 is in contact with the first housing 51', and the other end of the elastic member 55 is in contact with the pressure relief valve 53'. The pressure relief valve 53' has a first end surface 533' located in the gas outlet cavity 216. Under the action of the gas in the gas outlet cavity 216, the pressure relief valve 53' moves toward a position where the gas outlet cavity 216 is closed. The elastic member 55 provides a force for urging the pressure relief valve 53' to move toward the position where the air outlet chamber 216 is opened.

Specifically, a first protrusion 512' is provided on the first housing 51', and a second protrusion 531' capable of resisting the first protrusion 512' is correspondingly provided on the pressure relief valve 53'. When the pressure relief valve 53' moves until the second protrusion 531' resists the first protrusion 512', the air outlet chamber 216 is not in communication with the atmosphere, and the pressure relief valve 53' is in the closed position; when the pressure relief valve 53' moves to When the second protrusion 531' is far away from the first protrusion 512', the air outlet chamber 216 is in communication with the atmosphere, and the pressure relief valve 53' is in the open position.

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 air outlet cavity 216 through the opening 224 and the through hole 252; The gas in the gas outlet cavity 216 will not flow into the reset cavity 215 in the future. The gas pressure in the gas outlet cavity 216 is the largest, which is basically equal to the working pressure P3 of the gas source. The pressure of the pressure relief valve 53' received from the gas outlet chamber 216 is greater than the force of the elastic member 55, the elastic member 55 is compressed, and the pressure relief valve 53' moves until the air outlet chamber 216 and the exhaust port 52' are not connected and closed. position.

As the gas in the gas outlet cavity 216 gradually flows to the reset cavity 215, the gas pressure in the gas outlet cavity 216 decreases, and the gas pressure in the reset cavity 215 increases accordingly; when the gas pressure in the reset cavity 215 can drive the first When the piston 23 is reset to a preset value, the force of the elastic member 55 acting on the pressure relief valve 53' is designed to be greater than the gas pressure from the gas outlet chamber 216 received by the pressure relief valve 53'. In this way, the pressure relief valve 53' will move to the open position where the second protrusion 531' is away from the first protrusion 512', and the air outlet chamber 216 is in communication with the atmosphere.

10a and 12, due to the action of the pressure relief mechanism 5', the high pressure gas in the outlet chamber 216 is released to the atmospheric pressure level, and the gas in the reset chamber 215 will enter the cylinder 22 through the through hole 221, pushing the first The piston 23 moves toward the air outlet 212, and finally the reset of the first piston 23 is completed.

In a possible implementation manner, the air nail gun further includes 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 includes a controller and a sensor for measuring the gas pressure in the reset chamber; when the gas pressure in the reset chamber measured by the sensor is less than a preset value, the controller controls the pressure relief valve to be in the closed position; when the sensor When the measured gas pressure value in the reset chamber is greater than the preset value, the controller controls the pressure relief valve to be in the open position.

To sum up: by setting the first air flow channel to connect the reset cavity and the air outlet cavity, when the nailing operation is completed and the trigger is released, the high-pressure gas in the first variable cavity can sequentially pass through the opening, the through hole, and the second An air flow channel flows into the reset cavity to prepare for the reset of the first piston.

By setting the pressure relief mechanism, when the first piston moves to the second limit position and the balance valve moves to the second position, when the gas in the cylinder enters the outlet cavity, the pressure relief mechanism makes the outlet cavity not communicate with the atmosphere, and the pressure in the outlet cavity The gas can flow to the reset chamber to prepare for the resetting of the first piston; and when the gas pressure in the reset chamber reaches the preset value and is enough to drive the first piston to reset, the pressure relief mechanism makes the outlet chamber communicate with the atmosphere and is located in the reset chamber The gas in the cylinder can enter the inside of the cylinder through the through hole to drive the first piston to reset. As a result, the high-pressure gas used to drive the first piston to drive nails can enter the reset cavity through the first air flow channel, and then drive the first piston to reset, which improves the utilization efficiency of high-pressure gas; thus, it only needs to consume less gas. The nailing work saves energy while reducing the overall volume and weight of the air nail gun, making it light and portable.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express a few embodiments of the present invention, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

An air nail gun, characterized in that, the air nail gun includes:

The housing has a nail outlet end and an air outlet end that are arranged oppositely; the housing includes a handle cavity for communicating with the air source, a high pressure cavity communicating with the handle cavity, a balance cavity, a reset cavity, and an air outlet cavity;

The cylinder assembly is housed in the housing. The cylinder assembly includes a cylinder body and a first piston; one end of the cylinder body is provided with an opening, and the other end is connected to the nail-out end; the first piston is located in the The cylinder moves in a first limit position away from the nail exit end and a second limit position close to the nail exit end; the cylinder is also provided with a through hole;

The balance valve is housed in the housing and is provided with a through hole. The balance valve is movably arranged between the high-pressure chamber and the balance chamber, and has at least two positions; in the first position, the balance valve The opening is separated from the air outlet chamber, and the opening is in communication with the high pressure chamber; in the second position, the balance valve separates the opening from the high pressure chamber, and the opening passes through the through hole Communicate with the air outlet cavity;

The gas nail gun further includes a first airflow channel connecting the reset cavity and the air outlet cavity, and gas can only flow from the air outlet cavity to the reset cavity in the first airflow channel;

When the first piston moves to the second limit position and the balance valve moves to the second position, the gas in the cylinder passes through the opening, the through hole, the air outlet cavity and the first An air flow channel flows to the reset cavity; and, when the outlet cavity is in communication with the atmosphere, the gas in the reset cavity flows into the cylinder through the through hole, driving the first piston toward the first limit Position movement.
The gas nail gun according to claim 1, wherein the gas nail gun further comprises a pressure relief valve, the pressure relief valve has an open position that allows the air outlet cavity to communicate with the atmosphere, and the air outlet cavity and The closed position where the atmosphere is not connected.
3. The gas nail gun according to claim 2, wherein when the gas pressure in the reset cavity reaches a preset value, the pressure relief valve is switched from the closed position to the open position.
The gas nail gun according to claim 2, wherein when the gas in the cylinder flows to the reset cavity through the opening, the through hole, the air outlet cavity and the first air flow channel, and when The gas pressure in the reset cavity is equal to the gas pressure in the gas outlet cavity, and the pressure relief valve is switched from the closed position to the open position.
The gas nail gun according to claim 2, wherein the pressure relief valve is movably arranged in the housing and has a first end surface located in the gas outlet cavity; under the action of the gas in the gas outlet cavity , The pressure relief valve moves to the closed position.
The gas nail gun according to claim 5, wherein the gas nail gun further comprises a pressure relief cavity communicating with the air outlet cavity, and the pressure relief valve has a second end surface located in the pressure relief cavity Under the action of the gas in the pressure relief chamber, the pressure relief valve moves to the open position; the effective area of the first end surface is smaller than the effective area of the second end surface.
The gas nail gun according to claim 6, wherein the pressure relief chamber communicates with the outlet cavity through a second air flow channel, and the radial dimension of the second air flow channel is smaller than that of the first air flow channel. Radial size.
The gas nail gun according to claim 6, wherein the pressure relief valve comprises a pressure relief valve body and a second piston, and the second piston is located in the pressure relief chamber; One end is located in the air outlet cavity and has the first end surface; the other end of the pressure relief valve body is located in the relief cavity and is connected to the second piston; the effective area of the second end surface is equal to The sum of the end surface area of the pressure relief valve body located in the pressure relief cavity and the end surface area of the second piston.
8. The gas nail gun according to claim 8, wherein the pressure relief valve body is provided with a second air flow passage through it, and the pressure relief cavity and the air outlet cavity are in communication through the second air flow channel.
The gas nail gun according to claim 5, wherein the gas nail gun further comprises a first housing connected to the air outlet, and a pressure relief valve is arranged between the first housing and the pressure relief valve. An elastic member that provides a force for urging the pressure relief valve to move to the open position.
The gas nail gun according to claim 2, wherein the gas nail gun further comprises a control unit; the control unit comprises a controller and a sensor; the sensor is used to measure the gas pressure in the reset cavity; The controller controls the pressure relief valve to switch between the open position and the closed position according to the gas pressure in the reset chamber.
The gas nail gun according to claim 1, wherein the gas nail gun further comprises a switch assembly, the switch assembly comprises a switch cavity communicating with the balance cavity, and a switch cavity movable in the switch cavity Trigger, the trigger moves to make the switch cavity communicate with the handle cavity, or make the switch cavity communicate with the atmosphere.
The gas nail gun according to claim 1, wherein a one-way valve is provided in the first air flow channel.
An air nail gun, characterized in that, the air nail gun includes:

The housing has a nail outlet end and an air outlet end that are arranged oppositely; the housing includes a handle cavity for communicating with an air source, a high pressure cavity communicating with the handle cavity, a balance cavity, and an air outlet cavity;

The cylinder assembly is housed in the housing. The cylinder assembly includes a cylinder body and a first piston; one end of the cylinder body is provided with an opening, and the other end is connected to the nail-out end; the first piston is located in the The cylinder moves in a first limit position away from the nail exit end and a second limit position close to the nail exit end; the cylinder is also provided with a through hole;

The balance valve is movably arranged in the housing and is provided with a through hole. The balance valve has at least two positions; in the first position, the balance valve separates the opening from the air outlet cavity, and the opening Communicating with the high-pressure chamber; in the second position, the balance valve separates the opening from the high-pressure chamber, and the opening communicates with the outlet chamber through the through hole;

When the balance valve moves to the first position, the gas in the high-pressure chamber flows to the inside of the cylinder through the opening, driving the first piston to move toward the second extreme position; this is defined as the drive The gas moved by the first piston toward the second piston is nailing gas;

The gas nail gun further includes a reset cavity configured to receive the nailing gas; and the nailing gas of the reset cavity enters the inside of the cylinder through the through hole to drive the The first piston moves toward the first extreme position.
An air nail gun, characterized in that, the air nail gun includes:

The housing has a nail outlet end and an air outlet end that are arranged oppositely; the housing includes a handle cavity for communicating with the air source, a high pressure cavity communicating with the handle cavity, a balance cavity, a reset cavity, and an air outlet cavity;

The cylinder assembly is housed in the housing. The cylinder assembly includes a cylinder body and a first piston; one end of the cylinder body is provided with an opening, and the other end is connected to the nail-out end; the first piston is located in the Movement in the cylinder has a first limit position far away from the nail exit end and a second limit position close to the nail exit end:

The balance valve is movably arranged in the housing and is provided with a through hole. The balance valve has at least two positions; in the first position, the balance valve separates the opening from the air outlet cavity, and the opening Communicating with the high-pressure chamber; in the second position, the balance valve separates the opening from the high-pressure chamber, and the opening communicates with the outlet chamber through the through hole;

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

The gas nail gun also includes a pressure relief valve for opening or closing the air outlet cavity; when the first piston moves to the second limit position and the balance valve moves to the first In the second position, the gas in the cylinder flows through the opening, and the through hole flows to the air outlet cavity; the pressure relief valve is closed, and the gas flows from the air outlet cavity to the first air flow channel through the first air flow channel. Reset chamber; when the gas pressure in the reset chamber reaches a preset value, the pressure relief valve opens, and the gas outlet chamber is in communication with the atmospheric pressure.