Switchable automatic continuous nailing gun

Abstract

A switchable automatic continuous nailing gun, comprising a nail gun main body, wherein a cylinder main body is provided in the nail gun main body, and an upper air chamber, a middle air chamber and a lower air chamber are further provided in the nail gun main body in sequence; a balancing valve assembly is provided in the upper air chamber, and a piston assembly is provided in the cylinder main body; a pneumatic control valve assembly is provided on the outer side of the nail gun main body, a flow adjustment assembly is provided on a side surface of the pneumatic control valve assembly, and a switch assembly is provided on a side surface of the flow adjustment assembly; a first air path communicating the pneumatic control valve assembly and the lower air chamber is provided in the nail gun main body, and a second air path and a third air path are further provided in the nail gun main body; and the pneumatic control valve assembly comprises a single-click switching rod and a first return spring, and the single-click switching rod reciprocates to connect and disconnect the second air path from the third air path. The present invention achieves continuous nailing by switching the air paths by means of the pneumatic control valve assembly, adjusts the flow and nailing frequency by means of the flow adjustment assembly, and switches between a single-fire mode and a continuous-fire mode by means of the switch assembly.

Description

Switchable automatic continuous nail gun Technical Field

[0001] This invention belongs to the field of nail guns, specifically relating to a switchable automatic continuous nail gun. Background Technology

[0002] Pneumatic nail guns are a common nail-driving tool used frequently in daily life. Currently, pneumatic nail guns on the market offer various functions and are applicable to a wide range of scenarios. A patent with publication number CN113547485A discloses a pneumatic nail gun, including a gun body, a gun cover, a valve structure, and a trigger assembly. The gun body is equipped with a main air supply.

[0003] The pneumatic nail gun comprises a valve channel, a valve diaphragm assembly, a valve diaphragm chamber, a cylinder, a piston, and a needle. A first air storage chamber is provided between the cylinder and the gun body. The valve structure includes an inner valve seat, an inner valve core, a switching valve core, and a valve core spring. A valve channel is provided inside the gun body. The inner valve seat is fixed at the front end of the valve channel, and the inner valve core is movably located at the rear end of the valve channel. A second air storage chamber is formed between the two ends of the inner valve seat and the inner valve core. The rear end of the switching valve core passes through the inner valve seat and is inserted into the inner valve core. The front end of the switching valve core is located outside the inner valve seat and cooperates with the trigger assembly. One end of the valve core spring is connected to the switching valve core, and the other end of the valve core spring is connected to the inner valve core. Existing pneumatic nail guns mainly achieve automatic continuous nailing by switching the air path through a trigger assembly. The air path in the trigger assembly is relatively narrow, and the sealing requirements are high. At the same time, during nailing, impurities are easily drawn into the air path of the trigger assembly, and the automatic nailing function is prone to failure. Therefore, it is necessary to design a switchable automatic continuous nailing gun to overcome the above difficulties. Summary of the Invention

[0004] This invention addresses the problems existing in the prior art by designing a switchable automatic continuous nail gun. The invention uses a pneumatic control valve assembly to switch the air path, thereby causing the balance valve assembly to automatically reciprocate and extend, achieving continuous nailing. A flow rate adjustment assembly allows for easy adjustment of the nailing frequency. A switching switch assembly facilitates free switching between single-shot and continuous nailing modes.

[0005] The objective of this invention is achieved through the following technical solution: a switchable automatic continuous nail gun, comprising a nail gun body, a cylinder body inside the nail gun body, and an upper air chamber, a middle air chamber, and a lower air chamber arranged sequentially along the axial direction of the cylinder body inside the nail gun body; a balance valve assembly is provided in the upper air chamber, and a piston assembly is provided in the cylinder body; an air control valve assembly is provided on the outside of the nail gun body adjacent to the upper air chamber, a flow regulating assembly is provided on the side of the air control valve assembly, and a switching switch assembly is provided on the side of the flow regulating assembly; a first air passage connecting the air control valve assembly and the lower air chamber is provided inside the nail gun body, and a second air passage and a third air passage are also provided inside the nail gun body; the air control valve assembly includes a single-click switching lever and a first return spring, wherein the second air passage and the third air passage are switched on and off when the single-click switching lever moves back and forth.

[0006] Preferably, the handle of the nail gun body is provided with a control switch assembly, which includes a trigger, a switch body, and an actuation rod. When the trigger is pulled, the actuation rod extends or retracts relative to the switch body. The pneumatic valve assembly also includes a pneumatic valve body, and the balance valve assembly includes a balance valve body and a second return spring. The pneumatic valve body has a first channel that communicates with a second air passage. A common through hole is provided between the upper air chamber and the nail gun body. The common through hole is connected to the second air passage through the pneumatic valve assembly. One end of the second air passage is connected to the first channel, and the other end of the second air passage is connected to the control switch assembly.

[0007] Preferably, the upper air chamber is provided with a balance valve assembly that can reciprocate axially relative to the cylinder body; the balance valve body is slidably installed in the upper air chamber and is located near the opening end of the cylinder body; one end of the second return spring abuts against the balance valve body, and the other end of the second return spring abuts against the inner wall of the upper air chamber; the handle end of the nail gun body is provided with a terminal, which is connected to the middle air chamber; the end of the second air passage is provided with an inclined channel connected to the switch body.

[0008] Preferably, the pneumatic control valve body has a second channel, which is connected to a common through hole; a third air passage is provided between the nail gun body and the middle air chamber, the pneumatic control valve body has a third channel, and the third air passage is connected to the third channel; one end of the third air passage is connected to the third channel, and the other end of the third air passage is connected to the middle air chamber.

[0009] Preferably, the pneumatic control valve body is provided with a first channel, a second channel, and a third channel, the first channel being connected to a second air passage; the second channel being connected to an upper air chamber; and the third channel being connected to a third air passage. The pneumatic control valve body is also provided with a single-click switching rod that can move relative to its axial direction. A first return spring is provided between the single-click switching rod and the inner wall of the pneumatic control valve body, and several sealing rings are fitted on the single-click switching rod. In the default state, the single-click switching rod is positioned close to the flow regulating component.

[0010] In the default state, when the click switch lever is moved closer to the flow regulation component by the first reset spring, the first channel is connected to the second air path, and the third channel is blocked by the sealing ring on the click switch lever. Thus, the third air path is closed, and the second air path is open. In the default state, the trigger lever is not pressed, and the tilting channel is not blocked. The second air path connects to the middle air chamber through the hole on the switch body, so the middle and upper air chambers are in a conductive state. When the nail gun body's wiring terminal is connected to the air source, high pressure is generated in the middle air chamber. Since the second air path is open at this time, the high-pressure gas in the middle air chamber enters the upper air chamber along the second air path. The upper air chamber is under high pressure, which pushes the balance valve body against the opening of the cylinder body, and the firing pin on the piston assembly is in a ready-to-fire state. At this time, the cylinder body is under normal pressure.

[0011] When the operator pulls the trigger and holds it, the actuation rod retracts relative to the switch body. At this time, the actuation rod blocks the air passages of the middle and upper air chambers, while simultaneously opening the passage between the upper air chamber and the outside. Here, the upper air chamber is connected to the switch body via a second air passage, and the gas in the second air passage communicates with the outside through a port on the switch body. The high-pressure gas in the upper air chamber is released to atmospheric pressure through the second air passage. Because the balance valve body loses pressure, it moves to the left away from the cylinder body under the action of the second return spring; at this time, the cylinder body is connected to the high-pressure gas in the middle air chamber, causing the piston assembly to extend and enter the ejection mode.

[0012] Preferably, the pneumatic control valve assembly includes a pneumatic control valve body, and a flow regulating component is provided on the side of the pneumatic control valve body; the flow regulating component includes a flow valve body and an adjusting knob, the adjusting knob being threadedly connected to the flow valve body; the pneumatic control valve body has a single-click switching rod that can extend and retract relative to its axial direction, and a plug is fixedly installed at the end of the single-click switching rod, the plug being disposed between the pneumatic control valve body and the flow valve body; the flow valve body is connected to a first air passage, and when the adjusting knob is rotated, the adjusting knob moves axially relative to the opening end of the first air passage; a switching component is provided on the side of the flow valve body.

[0013] Preferably, one end of the first air passage is connected to the flow valve body, and the other end of the first air passage is connected to the lower air chamber; a cylinder body is provided in the lower air chamber and the middle air chamber, and a sealing component is provided between the lower air chamber and the middle air chamber to separate the two; a number of vent holes are provided in the cylinder body facing the lower air chamber; a limiting component is fixedly installed on the outside of the pneumatic control valve body, and the limiting component is located near the end of the adjustment knob.

[0014] Preferably, the switching assembly includes a switch base, an adjusting handle, a single-connection switching valve, and a third return spring; the switch base is fixedly connected to the flow valve body, and the switch base is provided with a single-connection switching valve that can extend and retract relative to it, and a third return spring is provided between the single-connection switching valve and the flow valve body; the air passage of the switching assembly is set between the flow regulating assembly and the air control valve assembly, and the switching assembly is in the closed state by default.

[0015] Preferably, the adjusting handle includes an eccentric portion, which is positioned toward the single-connection switching valve; when the adjusting handle is rotated, the single-connection switching valve moves relative to the switch seat; when the single-connection switching valve moves closer to the adjusting knob, the pneumatic valve assembly and the flow regulating assembly are interconnected.

[0016] Preferably, the flow valve body has a fourth channel for connecting the switching assembly and the pneumatic control valve assembly; the flow valve body also has a fifth channel for connecting the switching assembly and the first air path.

[0017] When the piston assembly moves to the right of the vent, the lower air chamber begins to inflate, creating high pressure. Because continuous nailing is required, the switching switch assembly is pre-activated, and the single-connection switching valve is positioned close to the adjustment knob. The fifth channel connects to the first air path, which in turn connects to the pneumatic control valve assembly via the fourth channel. The high pressure in the lower air chamber pressurizes the pneumatic control valve body through the first air path. This high pressure pushes the single-click switching lever away from the flow adjustment assembly. At this point, the sealing ring on the single-click switching lever blocks the first channel, and the third channel opens. The second air path is closed, and the third air path opens. With the third air path open, the middle air chamber connects to the upper air chamber via the third air path, and the upper air chamber is inflated. The high pressure in the upper air chamber pushes the balance valve body to the right, resting against the opening of the cylinder body. The high pressure inside the cylinder body is then released through the vent on the balance valve assembly, and the piston assembly automatically resets. This is the existing automatic reset structure of the piston assembly in a pneumatic nail gun, which will not be discussed further here. When the piston assembly returns to its initial state, the lower air chamber returns to normal pressure. The lower air chamber is connected to the pneumatic control valve body via the first air passage, causing depressurization within the valve body. Then, the switching lever, under the action of the first return spring, approaches the flow regulating assembly. At this time, the second air passage is open, and the third air passage is closed. Since the trigger is always pressed, the upper air chamber is depressurized via the second air passage, causing the balance valve body to quickly move to the left away from the cylinder body, and nailing begins. This process is repeated to achieve continuous nailing. By rotating the adjustment knob, the distance between the knob and the first air passage can be adjusted, facilitating flow regulation within the pneumatic control valve body and thus controlling the nailing frequency. Because the adjustment handle has an eccentric part, rotating it pushes the single-connection switching valve to extend or retract relative to the switch seat, facilitating control of the switching assembly's on / off state.

[0018] Compared with the prior art, the present invention has the following advantages: 1. The present invention controls the opening and closing of the second and third air passages through the air control valve assembly, thereby enabling the upper air chamber to be cyclically charged and discharged. When the upper air chamber is charged, the air control valve assembly is controlled to move back and forth, thereby achieving continuous nail firing. The structure is simple and reliable. 2. The air passage between the upper and middle air chambers is connected through the air control valve assembly, and the lower air chamber is connected through the first air passage to the air control valve assembly, which facilitates the charging and discharging of the cylinder body. 3. The air intake flow of the first air passage and the air control valve assembly is adjusted by the flow regulating assembly, thereby adapting and adjusting the nail firing frequency, which has good versatility. 4. The opening and closing of the first air passage and the air control valve assembly is easily controlled by the switching switch assembly, thereby achieving the switching between continuous firing and single firing, which has good versatility. 5. The air control valve assembly is set away from the control switch assembly, which can avoid air passage blockage and make it safer and more reliable to use. Attached Figure Description

[0019] Figure 1 is a perspective view of the present invention;

[0020] Figure 2 is a diagram of the internal structure of the present invention;

[0021] Figure 3 is a diagram of the internal structure of the first air passage;

[0022] Figure 4 shows the internal structure of the second air passage.

[0023] Figure 5 shows the internal structure of the third air passage.

[0024] Figure 6 shows the internal structure of the upper air chamber;

[0025] Figure 7 is a three-dimensional view of the pneumatic valve assembly and flow regulation assembly during assembly.

[0026] Figure 8 shows the internal structure of the pneumatic control valve body;

[0027] Figure 9 is an exploded view of the pneumatic valve assembly;

[0028] Figure 10 is a diagram of the internal structure of the pneumatic valve assembly;

[0029] Figure 11 is a diagram of the internal structure of the flow regulation component;

[0030] Figure 12 is a diagram of the internal structure of the switching assembly;

[0031] Figure 13 is an exploded view of the switching assembly;

[0032] Markings in the diagram: 1. Nail gun body; 2. Cylinder body; 3. Upper air chamber; 4. Middle air chamber; 5. Lower air chamber; 6. Balance valve assembly; 61. Balance valve body; 62. Second return spring; 7. Pneumatic control valve assembly; 71. Single-click switching lever; 72. First return spring; 73. Pneumatic control valve body; 74. First channel; 75. Second channel; 76. Third channel; 77. Sealing ring; 78. Plug; 8. Flow adjustment assembly; 81. Flow valve body; 82. Adjustment knob; 9. Switch assembly ; 91. Switch base; 92. Adjusting handle; 93. Single-connection switching valve; 94. Third return spring; 95. Eccentric part; 10. Piston assembly; 11. First air passage; 12. Second air passage; 13. Third air passage; 14. Control switch assembly; 141. Trigger; 142. Switch body; 143. Actuating rod; 15. Common through hole; 16. Terminal; 17. Inclined channel; 18. Sealing assembly; 19. Vent hole; 20. Limiting element; 21. Fourth channel; 22. Fifth channel. Detailed Implementation

[0033] The present invention will be further described below with reference to the embodiments illustrated in the accompanying drawings:

[0034] As shown in Figures 1 to 13, this embodiment discloses a switchable automatic continuous nail gun, including a nail gun body 1, a cylinder body 2 inside the nail gun body 1, and an upper air chamber 3, a middle air chamber 4, and a lower air chamber 5 arranged sequentially along the axial direction of the cylinder body 2 inside the nail gun body 1; a balance valve assembly 6 is provided in the upper air chamber 3, and a piston assembly 10 is provided in the cylinder body 2; a pneumatic control valve assembly 7 is provided on the outside of the nail gun body 1 adjacent to the upper air chamber 3, a flow regulating assembly 8 is provided on the side of the pneumatic control valve assembly 7, and a switching switch assembly 9 is provided on the side of the flow regulating assembly 8; a first air passage 11 connecting the pneumatic control valve assembly 7 and the lower air chamber 5 is provided inside the nail gun body 1, and a second air passage 12 and a third air passage 13 are also provided inside the nail gun body 1; the pneumatic control valve assembly 7 includes a single-click switching lever 71 and a first return spring 72, and the second air passage 12 and the third air passage 13 are switched on and off when the single-click switching lever 71 moves back and forth.

[0035] The nail gun body 1 has a control switch assembly 14 at its handle. The control switch assembly 14 includes a trigger 141, a switch body 142, and an actuation rod 143. When the trigger 141 is pulled, the actuation rod 143 extends or retracts relative to the switch body 142. The pneumatic valve assembly 7 also includes a pneumatic valve body 73. The balance valve assembly 6 includes a balance valve body 61 and a second return spring 62. The pneumatic valve body 73 has a first channel 74 that communicates with a second air passage 12. A common through hole 15 is provided between the upper air chamber 3 and the nail gun body 1. The common through hole 15 is connected to the second air passage 12 through the pneumatic valve assembly 7. One end of the second air passage 12 is connected to the first channel 74, and the other end of the second air passage 12 is connected to the control switch assembly 14. The upper air chamber 3 is equipped with a balance valve assembly 6 that can reciprocate axially relative to the cylinder body 2; the balance valve body 61 is slidably installed in the upper air chamber 3, and the balance valve body 61 is located near the opening end of the cylinder body 2; one end of the second return spring 62 abuts against the balance valve body 61, and the other end of the second return spring 62 abuts against the inner wall of the upper air chamber 3; the handle end of the nail gun body 1 is provided with a terminal 16, which is connected to the middle air chamber 4; the end of the second air passage 12 is provided with an inclined channel 17 that is connected to the switch body 142. The pneumatic control valve body 73 is provided with a second channel 75, which is connected to the common through hole 15; a third air passage 13 is provided between the nail gun body 1 and the middle air chamber 4, and a third channel 76 is provided in the pneumatic control valve body 73, which is connected to the third channel 76; one end of the third air passage 13 is connected to the third channel 76, and the other end of the third air passage 13 is connected to the middle air chamber 4. The pneumatic valve body 73 is provided with a first channel 74, a second channel 75, and a third channel 76. The first channel 74 is connected to the second air passage 12; the second channel 75 is connected to the upper air chamber 3; and the third channel 76 is connected to the third air passage 13. The pneumatic valve body 73 is also provided with a single-click switching rod 71 that can move relative to its axial direction. A first return spring 72 is provided between the single-click switching rod 71 and the inner wall of the pneumatic valve body 73. Several sealing rings 77 are fitted on the single-click switching rod 71. In the default state, the single-click switching rod 71 is positioned close to the flow regulating component 8.

[0036] The pneumatic valve assembly 7 includes a pneumatic valve body 73, and a flow regulating component 8 is provided on the side of the pneumatic valve body 73. The flow regulating component 8 includes a flow valve body 81 and an adjusting knob 82, and the adjusting knob 82 is threadedly connected to the flow valve body 81. The pneumatic valve body 73 has a single-click switching rod 71 that can extend and retract relative to its axial direction. A plug 78 is fixedly installed at the end of the single-click switching rod 71, and the plug 78 is located between the pneumatic valve body 73 and the flow valve body 81. The flow valve body 81 is connected to the first air passage 11. When the adjusting knob 82 is rotated, the adjusting knob 82 moves axially relative to the opening end of the first air passage 11. A switching switch assembly 9 is provided on the side of the flow valve body 81. One end of the first air passage 11 is connected to the flow valve body 81, and the other end of the first air passage 11 is connected to the lower air chamber 5. A cylinder body 2 is provided inside the lower air chamber 5 and the middle air chamber 4, and a sealing assembly 18 is provided between the two chambers to separate them. The cylinder body 2 has several vent holes 19 facing the lower air chamber 5. A limiting member 20 is fixedly installed on the outside of the pneumatic control valve body 73, and the limiting member 20 is located near the end of the adjusting knob 82. The switching assembly 9 includes a switch base 91, an adjusting handle 92, a single-connection switching valve 93, and a third return spring 94. The switch base 91 is fixedly connected to the flow valve body 81, and the switch base 91 has a single-connection switching valve 93 that can extend and retract relative to it. A third return spring 94 is provided between the single-connection switching valve 93 and the flow valve body 81. The air passage of the switching assembly 9 is located between the flow regulating assembly 8 and the pneumatic control valve assembly 7. By default, the switching assembly 9 is in the closed state. The adjusting handle 92 includes an eccentric portion 95, which is positioned towards the single-connection switching valve 93. When the adjusting handle 92 is rotated, the single-connection switching valve 93 moves relative to the switch base 91. When the single-connection switching valve 93 moves closer to the adjusting knob 82, the pneumatic valve assembly 7 and the flow regulating assembly 8 are interconnected. The flow valve body 81 has a fourth channel 21, which connects the switching assembly 9 and the pneumatic valve assembly 7. The flow valve body 81 also has a fifth channel 22, which connects the switching assembly 9 and the first air passage 11.

[0037] The specific operation process of this embodiment is as follows: In the default state, the switching lever 71 is moved close to the flow regulating component 8 under the action of the first reset spring 72. At this time, the first channel 74 is connected to the second air passage 12, and the third channel 76 is blocked by the sealing ring 77 on the switching lever 71. Thus, the third air passage 13 is in the closed state, and the second air passage 12 is in the open state. In the default state, the trigger 143 is not pressed by the trigger 141. At this time, the tilting channel 17 is not blocked, and the second air passage 12 is connected to the middle air chamber 4 through the hole on the switch body 142. Therefore, the middle air chamber 4 and the upper air chamber 3 are in the conductive state. When the terminal 16 of the nail gun body 1 is connected to the air source, the middle air chamber 4 will form a high pressure. Since the second air passage 12 is open at this time, the high pressure gas in the middle air chamber 4 enters the upper air chamber 3 along the second air passage 12. The upper air chamber 3 is in a high pressure state, so the high pressure gas will push the balance valve body 61 against the opening end of the cylinder body 2, and the firing pin on the piston assembly 10 is in a ready-to-fire state. At this time, the cylinder body 2 is in a normal pressure state.

[0038] When the operator pulls trigger 141 and does not release it, the actuation rod 143 retracts relative to the switch body 142. At this time, the actuation rod 143 blocks the air passages of the middle air chamber 4 and the upper air chamber 3, while opening the passage between the upper air chamber 3 and the outside. Here, the upper air chamber 3 is connected to the switch body through the second air passage 12, and the gas in the second air passage 12 communicates with the outside through the hole in the switch body 142. At the same time, the actuation rod 143 blocks the middle air chamber 4, thereby isolating the middle air chamber 4 from the upper air chamber 3. The high-pressure gas in the upper air chamber 3 is released to normal pressure through the second air passage 12. Since the balance valve body 61 loses pressure, the balance valve body 61 will move to the left away from the cylinder body 2 under the action of the second return spring 62. At this time, the cylinder body 2 is connected to the high-pressure gas in the middle air chamber 4, so the piston assembly 10 extends and is in the ejection mode.

[0039] When the piston assembly 10 moves to the right of the vent 19, the lower air chamber 5 begins to fill with air to form high pressure. Because continuous nailing is required, the switching switch assembly 9 is opened in advance, and the single-connection switching valve 93 is set close to the adjustment knob 82. The fifth channel 22 is connected to the first air passage 11, and the first air passage 11 is connected to the pneumatic control valve assembly 7 through the fourth channel 21. The high pressure of the lower air chamber 5 pressurizes the pneumatic control valve body 73 through the first air passage 11. The high pressure pushes the single-click switching rod 71 away from the flow adjustment assembly 8. At this time, the sealing ring 77 of the single-click switching rod 71 blocks the first channel 74 and the third channel 76 is opened. Then the second air passage 12 is closed and the third air passage 13 will open. With the third air passage 13 open, the middle air chamber 4 is connected to the upper air chamber 3 through the third air passage 13, and the upper air chamber 3 is in a charged state. The high pressure in the upper air chamber 3 will push the balance valve body 61 to the right and abut against the opening end of the cylinder body 2. At this time, the high pressure in the cylinder body 2 is released through the air hole on the balance valve assembly 6, and the piston assembly 10 automatically resets. This is the automatic reset structure of the piston assembly 10 in the existing pneumatic nail gun, which will not be discussed here. When the piston assembly 10 returns to its initial state, the lower air chamber 5 returns to normal pressure. The lower air chamber 5 is connected to the pneumatic control valve body 73 through the first air passage 11, so the pneumatic control valve body 73 is also depressurized. Then, the single-click switching lever 71 is moved closer to the flow regulating assembly 8 under the action of the first return spring 72. At this time, the second air passage 12 is in the open state, and the third air passage 13 is in the closed state. Since the trigger 141 is always pressed, the upper air chamber 3 is depressurized through the second air passage 12, and the balance valve body 61 quickly moves to the left away from the cylinder body 2, and then nailing begins. The above steps are repeated to achieve continuous nailing. By rotating the adjustment knob 82, the distance between the adjustment knob 82 and the first air passage 11 can be adjusted, so as to facilitate the adjustment of the flow rate in the pneumatic control valve body 73, thus controlling the nailing frequency. Since the adjustment handle 92 is provided with an eccentric part 95, rotating the adjustment handle 92 can push the single-connection switching valve 93 to extend and retract relative to the switch seat 91, so as to facilitate the control of the on / off state of the switching switch assembly 9.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A switchable automatic continuous nail gun, comprising a nail gun body (1), wherein a cylinder body (2) is disposed within the nail gun body (1), characterized in that, The nail gun body (1) is provided with an upper air chamber (3), a middle air chamber (4) and a lower air chamber (5) in sequence along the axial direction of the cylinder body (2); the upper air chamber (3) is provided with a balance valve assembly (6) and the cylinder body (2) is provided with a piston assembly (10); the outer side of the nail gun body (1) is provided with a pneumatic control valve assembly (7) adjacent to the upper air chamber (3), the side of the pneumatic control valve assembly (7) is provided with a flow regulating assembly (8), and the side of the flow regulating assembly (8) is provided with a switching switch assembly (9); the nail gun body (1) is provided with a first air passage (11) connecting the pneumatic control valve assembly (7) and the lower air chamber (5), and the nail gun body (1) is also provided with a second air passage (12) and a third air passage (13); the pneumatic control valve assembly (7) includes a single-click switching lever (71) and a first return spring (72), and the second air passage (12) and the third air passage (13) switch on and off when the single-click switching lever (71) moves back and forth.

2. The switchable automatic continuous nail gun according to claim 1, characterized in that, The nail gun body (1) has a control switch assembly (14) at the handle. The control switch assembly (14) includes a trigger (141), a switch body (142), and an actuation rod (143). When the trigger (141) is pulled, the actuation rod (143) extends and retracts relative to the switch body (142). The pneumatic valve assembly (7) also includes a pneumatic valve body (73). The balance valve assembly (6) includes a balance valve body (61) and a second return spring (62). The pneumatic valve body (73) has a first channel (74) inside, which is connected to the second air passage (12). The upper air chamber (3) and the nail gun body (1) have a common through hole (15). The common through hole (15) is connected to the second air passage (12) through the pneumatic valve assembly (7). One end of the second air passage (12) is connected to the first channel (74), and the other end of the second air passage (12) is connected to the control switch assembly (14).

3. The switchable automatic continuous nail gun according to claim 2, characterized in that, The upper air chamber (3) is provided with a balance valve assembly (6) that can move axially back and forth relative to the cylinder body (2); the balance valve body (61) is slidably installed in the upper air chamber (3), and the balance valve body (61) is set near the opening end of the cylinder body (2); one end of the second return spring (62) abuts against the balance valve body (61), and the other end of the second return spring (62) abuts against the inner wall of the upper air chamber (3); the handle end of the nail gun body (1) is provided with a terminal (16), and the terminal (16) is connected to the middle air chamber (4); the end of the second air passage (12) is provided with an inclined channel (17) connected to the switch body (142).

4. The switchable automatic continuous nail gun according to claim 2, characterized in that, The pneumatic control valve body (73) is provided with a second channel (75), which is connected to the common through hole (15); a third air passage (13) is provided between the nail gun body (1) and the middle air chamber (4); a third channel (76) is provided in the pneumatic control valve body (73), and the third air passage (13) is connected to the third channel (76); one end of the third air passage (13) is connected to the third channel (76), and the other end of the third air passage (13) is connected to the middle air chamber (4).

5. The switchable automatic continuous nail gun according to claim 2, characterized in that, The pneumatic valve body (73) is provided with a first channel (74), a second channel (75) and a third channel (76). The first channel (74) is connected to the second air passage (12); the second channel (75) is connected to the upper air chamber (3); and the third channel (76) is connected to the third air passage (13). The pneumatic valve body (73) is also provided with a single-click switching rod (71) that can move relative to its axial direction. A first return spring (72) is provided between the single-click switching rod (71) and the inner wall of the pneumatic valve body (73). Several sealing rings (77) are fitted on the single-click switching rod (71). In the default state, the single-click switching rod (71) is set close to the flow regulating component (8).

6. The switchable automatic continuous nail gun according to claim 1, characterized in that, The pneumatic valve assembly (7) includes a pneumatic valve body (73), and a flow regulating assembly (8) is provided on the side of the pneumatic valve body (73); the flow regulating assembly (8) includes a flow valve body (81) and an adjusting knob (82), the adjusting knob (82) being threadedly connected to the flow valve body (81); the pneumatic valve body (73) is provided with a single-click switching rod (71) that can extend and retract relative to its axial direction, and a plug (78) is fixedly installed at the end of the single-click switching rod (71), the plug (78) being located between the pneumatic valve body (73) and the flow valve body (81); the flow valve body (81) is connected to the first air passage (11), and when the adjusting knob (82) is rotated, the adjusting knob (82) moves axially relative to the opening end of the first air passage (11); a switching assembly (9) is provided on the side of the flow valve body (81).

7. The switchable automatic continuous nail gun according to claim 6, characterized in that, One end of the first air passage (11) is connected to the flow valve body (81), and the other end of the first air passage (11) is connected to the lower air chamber (5); the lower air chamber (5) and the middle air chamber (4) are provided with a cylinder body (2), and a sealing assembly (18) is provided between the lower air chamber (5) and the middle air chamber (4) to separate the two; the cylinder body (2) is provided with a number of vent holes (19) facing the lower air chamber (5); a limiting member (20) is fixedly installed on the outside of the pneumatic control valve body (73), and the limiting member (20) is located near the end of the adjustment knob (82).

8. The switchable automatic continuous nail gun according to claim 6, characterized in that, The switching assembly (9) includes a switch base (91), an adjustment handle (92), a single-connection switching valve (93), and a third return spring (94); the switch base (91) is fixedly connected to the flow valve body (81), and the switch base (91) is provided with a single-connection switching valve (93) that can extend and retract relative to it, and a third return spring (94) is provided between the single-connection switching valve (93) and the flow valve body (81); the air passage of the switching assembly (9) is set between the flow regulating assembly (8) and the pneumatic control valve assembly (7), and the switching assembly (9) is in the closed state by default.

9. The switchable automatic continuous nail gun according to claim 8, characterized in that, The adjusting handle (92) includes an eccentric part (95) which is positioned toward the single-connection switching valve (93). When the adjusting handle (92) is rotated, the single-connection switching valve (93) moves relative to the switch seat (91). When the single-connection switching valve (93) moves closer to the adjusting knob (82), the pneumatic valve assembly (7) and the flow regulating assembly (8) are interconnected.

10. The switchable automatic continuous nail gun according to claim 6, characterized in that, The flow valve body (81) is provided with a fourth channel (21), which is used to connect the switching assembly (9) and the pneumatic valve assembly (7); the flow valve body (81) is also provided with a fifth channel (22), which connects the switching assembly (9) and the first air passage (11).

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