CN113547485B

CN113547485B - Pneumatic nailing gun

Info

Publication number: CN113547485B
Application number: CN202110890326.6A
Authority: CN
Inventors: 林岳洪
Original assignee: GUANGDONG MINGHUI PNEUMATIC TECHNOLOGY CO LTD
Current assignee: GUANGDONG MINGHUI PNEUMATIC TECHNOLOGY CO LTD
Filing date: 2021-08-04
Publication date: 2024-07-02
Anticipated expiration: 2041-08-04

Abstract

The invention relates to a pneumatic nailing gun. The gun comprises a gun body, a gun cover, a valve structure and a trigger assembly, wherein a main air source channel, a valve membrane assembly, a valve membrane cavity, an air cylinder, a piston and a gun needle are arranged in the gun body, a first air storage cavity is arranged between the air cylinder and the gun body, the valve structure comprises an inner valve seat, an inner valve core, a switch valve core and a valve core spring, the valve channel is arranged in the gun body, the inner valve seat is fixed at the front end of the valve channel, the inner valve core is movably arranged at the rear end of the valve channel, a second air storage cavity is formed between the inner valve seat and two ends of the inner valve core, the rear end of the switch valve core penetrates through the inner valve core body from the inner valve seat and is matched with the trigger assembly, the front end of the switch valve core is positioned outside the inner valve seat, one end of the valve core spring is connected with the switch valve core, and the other end of the valve core spring is connected with the inner valve core. The invention has simple and reasonable structural design, improves the original valve structure, increases the continuous-impact valve and the speed regulating function, ensures smooth operation of the gas circuit, and ensures smooth single-impact and continuous-impact.

Description

Pneumatic nailing gun

Technical Field

The invention relates to a pneumatic nailing gun.

Background

The utility model provides a pneumatic nail rifle, including the rifle body, valve structure and trigger subassembly, be equipped with main air supply passageway in the rifle body, valve membrane module, valve membrane chamber, cylinder, piston and rifle needle, valve membrane module establishes the rear end at the cylinder, the rifle needle passes the cylinder under the piston drives and passes the air cylinder and pass in rifle body front end business turn over, because current pneumatic nail rifle needs two kinds of modes of single form of beating and form of beating, single form of beating refers to trigger subassembly and pulls once, the cylinder work is once, the form of beating refers to trigger subassembly and buckles once, the cylinder continuous operation. The pneumatic nailing gun is complex in structure, and the pneumatic circuit works poorly, so that the striking effect is poor.

Disclosure of Invention

Therefore, the invention aims to provide the pneumatic nailing gun with smooth air passage and good single-shot or continuous-shot effect.

The object of the present invention is thus achieved.

The pneumatic nailing gun comprises a gun body, a gun cover, a valve structure and a trigger assembly, wherein a main air source channel, a valve membrane assembly, a valve membrane cavity, an air cylinder, a piston and a gun needle are arranged in the gun body, the valve membrane assembly is arranged at the rear end of the air cylinder, the valve membrane assembly reciprocates between the rear end of the air cylinder and the gun cover, the gun needle passes through the air cylinder under the drive of the piston to enter and exit at the front end of the gun body, a first air storage cavity is arranged between the air cylinder and the gun body, the valve structure comprises an inner valve seat, an inner valve core, a switch valve core and a valve core spring, the gun body is internally provided with the valve channel, the inner valve seat is fixed at the front end of the valve channel, the inner valve core is movably arranged at the rear end of the valve channel, a second air storage cavity is formed between the inner valve seat and the two ends of the inner valve core, the rear end of the switch valve core passes through the inner valve seat and is inserted into the inner valve core, the front end of the switch valve core is positioned at the outer side of the inner valve seat and matched with the trigger assembly, one end of the valve core spring is connected with the switch valve core, and the other end of the valve core is connected with the inner valve core.

The rear end part of the inner valve core is provided with a first air inlet which is communicated with the main air source channel, the first air inlet is communicated with the second air storage cavity through the hollow inner cavity of the inner valve core, a first air passage is arranged in the switch valve core body, and the first air passage adjusts the air pressure in the second air storage cavity along with the movement of the switch valve core.

The gun body is internally provided with a second communication air passage, two ends of the second communication air passage are communicated with the valve membrane cavity and the valve channel around the outer side wall of the inner valve core, and when the inner valve core moves backward, gas in the main gas source channel enters the valve channel, the second communication air passage and the valve membrane cavity.

A third communication air passage is arranged in the gun body, and when the inner valve core moves towards the front end, the third communication air passage discharges the gas in the valve passage around the outer side wall of the inner valve core out of the gun body.

The gun body is also internally provided with a continuous impact valve which is arranged in a continuous impact valve channel in the gun body, the gun body corresponding to the continuous impact valve channel is provided with a second air inlet, a first air inlet, a second air inlet and a first air outlet, the continuous impact valve comprises an adjusting rod, a continuous impact valve seat and a continuous impact valve core, the continuous impact valve seat is fixedly arranged in the continuous impact valve channel, the continuous impact valve core is movably arranged in the continuous impact valve channel, the inner end of the adjusting rod respectively passes through the continuous impact valve seat and the continuous impact valve core to reach the inner side of the first air inlet, the outer end of the adjusting rod rotates to change the air flow between the inner end of the adjusting rod and the first air inlet, the second air inlet is positioned at the joint of the continuous impact valve seat and the continuous impact valve core, the second air inlet is communicated with the main air source channel, the first air inlet is communicated with the first air storage cavity, the first air outlet is communicated with the outer side of the gun body, the second air inlet is communicated with the continuous impact valve channel around the outer side wall of the continuous impact valve core, meanwhile, the second air inlet is communicated with the valve channel around the outer side wall of the inner valve seat, a fourth communication air channel is arranged in the corresponding inner valve seat, one end of the fourth communication air channel is communicated with the valve channel around the outer side wall of the inner valve seat, and the other end of the fourth communication air channel is blocked by the outer side wall of the switch valve core or is communicated with the first communication air channel in the moving process of the switch valve core.

The above technical solution is further described in detail below.

The switch valve core is sequentially sleeved with a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring from the front end to the rear end, one port of the first air passage is positioned between the first sealing ring and the second sealing ring, and the other port of the first air passage is positioned between the third sealing ring and the fourth sealing ring.

When the port of the fourth communication air passage, which is close to the switch valve core side, is positioned between the first sealing ring and the second sealing ring, the fourth communication air passage is communicated with the first communication air passage, and when the port of the fourth communication air passage, which is close to the switch valve core side, is positioned between the second sealing ring and the third sealing ring, the fourth communication air passage is blocked by the outer side wall of the switch valve core.

When the valve core moves along with the switch, the fourth sealing ring is unseated to enable the second air storage cavity to be communicated with the first air passage or enable the second air storage cavity to be communicated with the hollow cavity of the inner valve core.

The front end of the inner valve core is sleeved with a fifth sealing ring, the rear end of the inner valve core is sleeved with a sixth sealing ring, when the fifth sealing ring forms a seal with the valve channel, the second communication air channel is communicated with the main air source channel, and when the sixth sealing ring forms a seal with the valve channel, the second communication air channel is communicated with the third communication air channel.

The trigger assembly is provided with a switch gear which controls the rotation amplitude of the trigger assembly.

The valve core is characterized in that a seventh sealing ring, an eighth sealing ring and a ninth sealing ring are sequentially sleeved from a second air inlet to a first air inlet, when sealing is formed between the seventh sealing ring and the valve channel, the second air inlet is only communicated with a main air source channel, the second air inlet is communicated with a first air outlet through the valve channel around the outer side wall of the valve core, when the first air inlet pushes the valve core to move towards the valve seat side, the first air outlet is blocked by the eighth sealing ring and the ninth sealing ring, the seventh sealing ring loses sealing effect, the second air inlet is communicated with the valve channel around the outer side wall of the valve core, and air in the main air source channel passes through the second air inlet, the valve channel around the outer side wall of the valve core and enters the second air inlet.

And a check valve is arranged in a fifth communication air passage for inflating the air cylinder to the first air storage cavity, and the check valve ensures that air flows from the air cylinder to the first air storage cavity.

The invention has simple and reasonable structural design, improves the original valve structure, increases the continuous-impact valve and the speed regulating function, ensures smooth operation of the gas circuit, ensures that the single-impact and the continuous-impact are very smooth, ensures that the single-impact and the continuous-impact are convenient to convert, is easy to process and has long service life.

Drawings

Fig. 1 is a schematic diagram of an implementation structure, wherein the implementation structure is shown in a pre-working state.

Fig. 2 is an axial structural schematic diagram of the continuous-click valve, wherein the valve is not operated when being clicked.

Fig. 3 is an enlarged schematic view of a portion a of fig. 1.

FIG. 4 is a schematic diagram of an embodiment of a selection click mode operation structure.

FIG. 5 is a schematic diagram of an embodiment of a select-click mode operation, wherein the select-click mode operation is in a hit state.

Fig. 6 is an axial structural schematic diagram of the continuous-impact valve in the continuous-impact mode of fig. 5.

Fig. 7 is an enlarged schematic view of a portion B of fig. 5.

FIG. 8 is a schematic view of an embodiment of a select burst mode of operation with the needle in a retracted state.

Fig. 9 is an enlarged schematic view of a portion C of fig. 8.

Fig. 10 is an axial structural schematic diagram of the continuous-impact valve in the continuous-impact mode of fig. 8.

Detailed Description

The invention is further described in detail below with reference to the drawings and examples.

The front-rear direction of this embodiment refers to the direction of the forward ejection of the gun needle from the gun body as the front and the backward retraction of the gun needle from the cylinder as the rear, depending on the direction of the gun needle movement.

The embodiment is described below on the whole, and in combination with fig. 1 to 10, a pneumatic nail gun includes a gun body 1, a gun cover 2, a valve structure, a trigger assembly 3 and a switch gear 4, wherein the switch gear controls the rotation amplitude of the trigger assembly, so as to realize the selection of a single-click working mode and a continuous-click working mode.

The gun body 1 is internally provided with a main air source channel 5 (shown by P in the figure), a valve membrane component 6, a valve membrane cavity 7, an air cylinder 8, a piston 9 and a gun needle 10, wherein the valve membrane component is arranged at the rear end of the air cylinder, the valve membrane component reciprocates between the rear end of the air cylinder and a gun cover, the valve membrane component moves forwards, the air cylinder is relieved, the valve membrane component moves backwards, the air cylinder is inflated, the gun needle passes through the air cylinder to enter and exit at the front end of the gun body under the drive of the piston, a first air storage cavity 11 (shown by P1 in the figure) is arranged between the air cylinder and the gun body, the gun body is also internally provided with a fifth communication air channel 12, and a one-way valve 13 is arranged in the fifth communication air channel 12 for inflating the air cylinder 8 to the first air storage cavity 11, and ensures that air is inflated from the air cylinder to the first air storage cavity.

The valve structure comprises an inner valve seat 14, an inner valve core 15, a switch valve core 16 and a valve core spring 17, wherein a valve channel 18 is arranged in the gun body 1, the inner valve seat is fixed at the front end of the valve channel, the inner valve core is movably arranged at the rear end of the valve channel, a second air storage cavity 19 is formed between the inner valve seat 14 and two end parts of the inner valve core 15, the rear end of the switch valve core penetrates through the inner valve seat from the inner valve seat to be inserted into the inner valve core, the front end of the switch valve core 16 is positioned at the outer side of the inner valve seat 14 and matched with the trigger assembly 3, one end of the valve core spring 17 is connected with the switch valve core 16, and the other end of the valve core spring 17 is connected with the inner valve core 15.

The rear end part of the inner valve core 15 is provided with a first air inlet 20, the first air inlet 20 is communicated with the main air source channel 5, the first air inlet 20 is communicated with the second air storage cavity 19 through the hollow inner cavity of the inner valve core 15, the switch valve core 16 is internally provided with a first air passage 21, and the first air passage 21 regulates the air pressure in the second air storage cavity 19 along with the movement of the switch valve core 16.

The gun body 1 is internally provided with a second communication air passage 22, two end parts of the second communication air passage 22 are communicated with the valve membrane cavity 7 and valve passages around the outer side wall of the inner valve core 15, and when the inner valve core moves backward, gas in the main gas source passage enters the valve passages, the second communication air passage and the valve membrane cavity.

The gun body is internally provided with a third communication air passage 23, and when the inner valve core moves towards the front end, the third communication air passage 23 discharges the gas in the valve channel around the outer side wall of the inner valve core 15 out of the gun body.

The gun body 1 is also internally provided with a trigger valve M (the trigger valve is shown in a radial section in fig. 1, 4,5 and 8, and is shown in an axial section in fig. 2, 6 and 10), the trigger valve is arranged in a trigger valve channel 24 in the gun body, the gun body corresponding to the trigger valve channel 24 is provided with a second air inlet 25, a first air port 26, a second air port 27 (shown by P2 in the figure) and a first air outlet 28 (shown by reference numeral 01 in the figure), the trigger valve M comprises an adjusting rod 29, a trigger valve seat 30 and a trigger valve core 31, the trigger valve seat 30 is fixedly arranged in the trigger valve channel 24, the trigger valve core 31 is movably arranged in the trigger valve channel 24, the inner end of the adjusting rod 29 respectively penetrates through the trigger valve seat and the trigger valve core to reach the inner side of the first air port 26, and the outer end of the adjusting rod rotates to change the air flow between the inner end and the first air port.

The second air inlet 25 is positioned at the joint of the continuous impact valve seat 30 and the continuous impact valve core 31, the second air inlet 25 is communicated with the main air source channel 5, the first air outlet 26 is communicated with the first air storage cavity 11, the first air outlet 28 is communicated with the outside of the gun body, the second air outlet 27 is communicated with the continuous impact valve channel 24 positioned around the outer side wall of the continuous impact valve core 31, meanwhile, the second air outlet 27 is communicated with the valve channel around the outer side wall of the inner valve seat 14, a fourth communication air channel 32 is arranged in the corresponding inner valve seat 14, one end of the fourth communication air channel 32 is communicated with the valve channel around the outer side wall of the inner valve seat 14, and the other end of the fourth communication air channel 32 is blocked by the outer side wall of the switch valve core 16 or is communicated with the first communication air channel 21 in the moving process of the switch valve core.

The switch valve core 16 is sequentially sleeved with a first sealing ring 33, a second sealing ring 34, a third sealing ring 35 and a fourth sealing ring 36 from the front end to the rear end, one port of the first air passage 21 is positioned between the first sealing ring 33 and the second sealing ring 34, and the other port of the first air passage 21 is positioned between the third sealing ring 35 and the fourth sealing ring 36.

When the port of the fourth communication air passage 32 near the switch valve core 16 side is positioned between the first sealing ring 33 and the second sealing ring 34, the fourth communication air passage 32 is communicated with the first communication air passage 21, and when the port of the fourth communication air passage 32 near the switch valve core side is positioned between the second sealing ring 34 and the third sealing ring 35, the fourth communication air passage 32 is blocked by the outer side wall of the switch valve core 16.

The fourth seal 36 communicates the second air storage chamber 19 with the first air passage 21 or communicates the second air storage chamber 19 with the hollow inner chamber of the inner valve core 15 when moving with the switching valve core 16.

The front end of the inner valve core 15 is sleeved with a fifth sealing ring 37, the rear end of the inner valve core 15 is sleeved with a sixth sealing ring 38, when the fifth sealing ring 37 forms a seal with the valve channel 18, the second communication air channel 22 is communicated with the main air source channel 5, and when the sixth sealing ring 38 forms a seal with the valve channel 18, the second communication air channel 22 is communicated with the third communication air channel 23.

When the seventh sealing ring 39, the eighth sealing ring 40 and the ninth sealing ring 41 are sleeved in sequence from the second air inlet 25 to the first air inlet 26, and when the seventh sealing ring 39 and the continuous valve channel 24 form sealing, the second air inlet 25 is only communicated with the main air source channel 5, the second air inlet 27 is communicated with the first air outlet 28 through the continuous valve channel around the outer side wall of the continuous valve core 31, when the first air inlet 26 is used for pushing the continuous valve core 31 to move towards the continuous valve seat 30, the first air outlet 28 is blocked by the eighth sealing ring 40 and the ninth sealing ring 41, the seventh sealing ring 39 loses sealing effect, the second air inlet 25 is communicated with the continuous valve channel around the outer side wall of the continuous valve core, and gas in the main air source channel 5 passes through the second air inlet 25, the continuous valve channel around the outer side wall of the continuous valve core and enters the second air inlet 27.

Describing the clicking operation mode of the present embodiment, referring to fig. 1 to 4, the main air source channel 5 is inflated, the switch gear 4 is rotated, the trigger assembly 3 is adjusted to the clicking operation mode, the piston 9 is retracted, the first sealing ring 33 is located at the outer side of the inner valve seat 14, one end opening of the first air channel 21 is located at the outer side of the inner valve seat 14 and is communicated with the atmosphere, the second air storage cavity 19 cannot be exhausted, the air in the main air source channel is inflated by the first air inlet 20 to the second air storage cavity 19, the air pushes the inner valve core 15 to move backwards, the sixth sealing ring 38 is not sealed, the air in the main air source channel enters the second communication air channel 22 through the gap between the outer side wall of the inner valve core and the valve channel, then enters the valve membrane cavity 7, the valve membrane assembly 6 is pushed to move forwards, the air cylinder 8 behind the piston 9 is released, the trigger assembly is pulled, the switch valve core 16 moves backwards, the first sealing ring 33 is still located outside the inner valve seat, one port of the first air passage 21 is still located outside the inner valve seat and communicated with the atmosphere, but the other port of the first air passage 21 is communicated with the second air storage cavity 19, the second air storage cavity 19 is depressurized, the air in the main air source channel pushes the inner valve core 15 forwards, the sixth sealing ring 38 forms a seal with the valve channel 18, the fifth sealing ring 37 loses sealing, the air in the valve membrane cavity 7 is depressurized through the second communication air passage 22 and the third communication air passage 23, the air in the main air source channel enters the air cylinder from the air inlet 42 of the air cylinder to push the valve membrane assembly backwards, the air cylinder behind the piston forms sealing, the air in the main air source channel continuously enters the air cylinder to push the piston to move forwards, the air entering the air cylinder can also charge the first air storage cavity 11 through the one-way valve 13 to complete the impact, due to the single-impact working mode, the valve is not operated by the clicking.

After the striking is completed, the trigger assembly 3 is loosened, the switch valve core 16 moves forwards for resetting, the second air storage cavity 19 forms a non-pressure-relief mode, the second air storage cavity starts to be inflated, the inner valve core 15 is pushed by the air in the second air storage cavity 19 to move backwards, the fifth sealing ring 37 forms a seal, the valve membrane cavity starts to enter air to push the valve membrane assembly to move forwards, the air cylinder behind the piston starts to relieve pressure again, meanwhile, the air in the first air storage cavity 11 enters the air cylinder in front of the piston to push the piston to move backwards, and the striking is completed once, and then the trigger assembly is pulled to perform the next striking.

If the continuous working mode is selected, and with reference to fig. 1,2 and 3, and with reference to fig. 5 to 10, the main air source channel 5 is charged, the switch gear is rotated, the trigger component is adjusted to the continuous working mode, the piston is retracted, the first sealing ring is positioned at the outer side of the inner valve seat, one port of the first air channel is positioned at the outer side of the inner valve seat and communicated with the atmosphere, the second air storage cavity cannot be discharged, the air in the main air source channel is charged into the second air storage cavity through the first air inlet, the air pushes the inner valve core to move backwards, the sixth sealing ring is not sealed, the air in the main air source channel enters the second communication air channel through a gap between the outer side wall of the inner valve core and the valve channel and then enters the valve membrane cavity, and the valve membrane component is pushed to move forwards, and releasing pressure of the cylinder. At this time, the trigger assembly 3 is pulled and kept still, the switch valve core 15 moves backwards until the first sealing ring 33 forms a seal with the inner valve seat 14, the first air passage 21 is blocked, the first air passage 21 is communicated with the second air storage cavity 19, the air in the second air storage cavity 19 flows into the fourth air passage 32 through the first air passage 21 and enters a gap between the outer side wall of the continuous valve core 31 and the continuous valve core channel through the second air port 27, at this time, the air in the main air source channel pushes the continuous valve core 31 to move towards the first air port 26 through the second air inlet 25 due to no pressure in the first air storage cavity 11, the second air port 27 is communicated with the first air outlet 28, The first exhaust port 28 exhausts the air to the outside of the gun body, the second air storage cavity 19 is depressurized, the inner valve core 15 is pushed by the air in the main air source channel to move forwards, the sealing is formed by the sealing six sealing rings 38, the sealing is lost by the fifth sealing ring 35, the air in the valve film cavity 7 is depressurized through the second communication air channel 22 and the third communication air channel 23, the air in the main air source channel enters the air cylinder from the air inlet 42 of the air cylinder, the valve film assembly 6 is pushed backwards, the air in the main air source channel continuously enters the air cylinder behind the piston, so that the piston is pushed forwards, the impact is completed, the air in the main air source channel also enters the first air storage cavity 11 through the one-way valve 13 after the piston moves forwards, Continuously inflating the first air storage cavity, pushing the valve plug 31 to the valve seat 30 by the air in the first air storage cavity, sealing the first air outlet 28 by the eighth seal 40 and the ninth seal 41, communicating the second air inlet 25 with the second air inlet 27, inflating the air in the main air source channel to the second air storage cavity 19 through the second air inlet 27, the fourth communication air channel 32 and the first air channel 21, pushing the inner valve plug backwards again, sealing the sixth seal is lost, sealing the fifth seal, pushing the valve membrane component forwards again, releasing pressure of the air cylinder behind the piston, pushing the piston backwards again by the air in the first air storage cavity, after the piston returns to the original position by the first air storage cavity, No gas enters the first air storage cavity 11, the pressure in the first air port 26 side of the continuous impact valve core 31 does not push the continuous impact valve core, the gas in the main gas source channel pushes the continuous impact valve core to the first air port side, the second air port 27 and the second air inlet 25 are blocked by the seventh sealing ring 39, the second air port 27 is communicated with the first air outlet 28 again, finally, the pressure in the second air storage cavity is lost, the inner valve core is pushed to move forwards again, the sixth sealing ring forms a seal, the fifth sealing ring loses the seal, the valve membrane component moves forwards, the cylinder behind the piston is decompressed, the gas in the main gas source channel enters the cylinder again to form impact, as long as the trigger component is not loosened, The piston can continuously move in the cylinder to complete continuous striking.

Claims

1. The utility model provides a pneumatic nail rifle, includes the rifle body, rifle lid, valve structure and trigger subassembly, is equipped with main air supply passageway in the rifle body, valve membrane module, valve membrane chamber, cylinder, piston and rifle needle, and valve membrane module establishes the rear end at the cylinder, and valve membrane module reciprocates between cylinder rear end and rifle lid, and the rifle needle passes the cylinder under the piston drives and passes the cylinder and pass in rifle body front end business turn over, is equipped with first air storage chamber between cylinder and the rifle body, its characterized in that: the valve structure comprises an inner valve seat, an inner valve core, a switch valve core and a valve core spring, wherein a valve channel is arranged in the gun body, the inner valve seat is fixed at the front end of the valve channel, the inner valve core is movably arranged at the rear end of the valve channel, a second air storage cavity is formed between the inner valve seat and two ends of the inner valve core, the rear end of the switch valve core penetrates through the inner valve seat body and is inserted into the inner valve core, the front end of the switch valve core is positioned at the outer side of the inner valve seat and is matched with the trigger component, one end of the valve core spring is connected with the switch valve core, and the other end of the valve core spring is connected with the inner valve core;

The rear end part of the inner valve core is provided with a first air inlet which is communicated with the main air source channel, the first air inlet is communicated with the second air storage cavity through the hollow inner cavity of the inner valve core, a first air passage is arranged in the switch valve core body, and the first air passage adjusts the air pressure in the second air storage cavity along with the movement of the switch valve core;

the gun body is internally provided with a second communication air passage, two ends of the second communication air passage are communicated with the valve membrane cavity and the valve channel around the outer side wall of the inner valve core, and when the inner valve core moves backward, gas in the main gas source channel enters the valve channel, the second communication air passage and the valve membrane cavity;

a third communication air passage is arranged in the gun body, and when the inner valve core moves towards the front end, the third communication air passage discharges the gas in the valve passage around the outer side wall of the inner valve core out of the gun body;

2. The pneumatic nail gun of claim 1, wherein: the switch valve core is sequentially sleeved with a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring from the front end to the rear end, one port of the first air passage is positioned between the first sealing ring and the second sealing ring, and the other port of the first air passage is positioned between the third sealing ring and the fourth sealing ring;

When the port of the fourth communication air passage, which is close to the switch valve core side, is positioned between the first sealing ring and the second sealing ring, the fourth communication air passage is communicated with the first communication air passage, and when the port of the fourth communication air passage, which is close to the switch valve core side, is positioned between the second sealing ring and the third sealing ring, the fourth communication air passage is blocked by the outer side wall of the switch valve core;

3. The pneumatic nailing gun of claim 1, wherein a fifth sealing ring is sleeved at the front end of the inner valve core, a sixth sealing ring is sleeved at the rear end of the inner valve core, the second communication air passage is communicated with the main air source passage when the fifth sealing ring forms a seal with the valve passage, and the second communication air passage is communicated with the third communication air passage when the sixth sealing ring forms a seal with the valve passage.

4. The pneumatic nail gun of claim 1, wherein: the trigger assembly is provided with a switch gear which controls the rotation amplitude of the trigger assembly.

5. The pneumatic nail gun of claim 1, wherein: the valve core is characterized in that a seventh sealing ring, an eighth sealing ring and a ninth sealing ring are sequentially sleeved from a second air inlet to a first air inlet, when sealing is formed between the seventh sealing ring and the valve channel, the second air inlet is only communicated with a main air source channel, the second air inlet is communicated with a first air outlet through the valve channel around the outer side wall of the valve core, when the first air inlet pushes the valve core to move towards the valve seat side, the first air outlet is blocked by the eighth sealing ring and the ninth sealing ring, the seventh sealing ring loses sealing effect, the second air inlet is communicated with the valve channel around the outer side wall of the valve core, and air in the main air source channel passes through the second air inlet, the valve channel around the outer side wall of the valve core and enters the second air inlet.

6. The pneumatic nail gun of claim 1, wherein: and a check valve is arranged in a fifth communication air passage for inflating the air cylinder to the first air storage cavity, and the check valve ensures that air flows from the air cylinder to the first air storage cavity.