Novel pneumatic nail gun

Abstract

The present application relates to a new type of pneumatic nail gun. It comprises a gun body, the gun body is provided with a trigger and an air path, and the gun body is further provided with a self-lubricating structure for oil injection lubrication of the air path. The self-lubricating structure comprises a valve shell, the front end of the valve shell is provided with an automatic oil injection device, the rear end of the valve shell is provided with an air compensation device, and the valve shell is provided with an oil storage cavity. The air compensation device can introduce external air into the oil storage cavity when the pressure in the oil storage cavity decreases. The automatic oil injection device comprises a front valve cover, a valve core and a return spring. The present application has simple and reasonable structure, the self-lubricating structure can automatically supplement the lubricating oil for the air path, the oil supplementing amount is easy to control, the gun body is well lubricated, the sealing ring is not easy to be damaged, the self-lubricating structure is also convenient to add oil, and the lubricating oil in the oil storage cavity can be used for more than 20,000 times of trigger pulling.

Description

Technical Field

[0001] This invention relates to a novel pneumatic nail gun. Background Technology

[0002] The air circuit of existing pneumatic nail guns requires lubrication. Currently, lubrication is done manually, which makes it difficult to control the amount of oil added, is inconvenient, and is easy to forget to add oil, causing damage to the gun body. Summary of the Invention

[0003] Therefore, the purpose of this invention is to provide a novel pneumatic nail gun that can automatically and quantitatively supply lubricating oil to the air circuit.

[0004] The objective of this invention is achieved as follows.

[0005] A novel pneumatic nail gun includes a gun body with a trigger and an air passage. The gun body also includes a self-lubricating structure for oil lubrication of the air passage. The self-lubricating structure includes a valve housing with an automatic oil spraying device at its front end and an air compensation device at its rear end. An oil storage chamber is located within the valve housing. The air compensation device can introduce outside air into the oil storage chamber when the pressure there is reduced. The automatic oil spraying device includes a front valve cover, a valve core, and a return spring. The front valve cover is connected to the valve housing and has an oil spray nozzle. The valve core has an oil delivery channel, with the inlet and outlet of the channel not connected outside the valve core. A first sealing ring is provided between the inlet and the oil storage chamber, and a second sealing ring is fitted over the outlet. The return spring resets the valve core after it is pushed.

[0006] The fuel injector is connected to the air passage.

[0007] The above technical solution can be further improved as follows.

[0008] A third sealing ring is fitted on the outer surface of the valve core between the oil inlet and the oil outlet. The third sealing ring isolates the oil inlet and the oil outlet outside the valve core, preventing them from communicating.

[0009] The valve body behind the corresponding valve core is provided with a step, and the valve core moves between the front valve cover and the step.

[0010] An air passage is provided on the valve housing in front of the front valve cover, and the air passage is connected to the air circuit.

[0011] The reset spring is located in the oil storage chamber, with one end abutting against the valve core and the other end abutting against the air compensation device.

[0012] The air compensation device includes a rear valve cover, which is connected to the valve housing. The rear valve cover has an air supply channel, and the air supply channel contains a ball bearing and an air supply return spring. The ball bearing blocks the air supply channel under the action of the air supply return spring.

[0013] The other end of the air replenishment reset spring is provided with an adjustment block, and the end of the air replenishment spring abuts against the adjustment block, which is threadedly connected to the air replenishment channel.

[0014] The oil storage chamber is equipped with a transparent oil pipe, and the valve body corresponding to the position of the oil storage chamber is equipped with an observation window for viewing the oil pipe.

[0015] The invention has a simple and reasonable structural design. The self-lubricating structure can automatically replenish the air circuit with lubricating oil. The amount of oil replenishment is easy to control, the gun body is well lubricated, the sealing ring is not easily damaged, and the self-lubricating structure is also convenient to add oil. The lubricating oil in the oil storage chamber can be added once to allow the trigger to be pulled more than 20,000 times. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the appearance of an embodiment.

[0017] Figure 2 This is an exploded view of an embodiment.

[0018] Figure 3 This is an exploded view of the self-lubricating structure in an embodiment.

[0019] Figure 4 This is a schematic diagram of the embodiment before the trigger is pulled in the initial state. The oil outlets of the oil supply channel are all closed. The pneumatic nail gun body is shown in a simplified diagram.

[0020] Figure 5 This is a schematic diagram of the embodiment after the trigger is pulled. Oil is introduced into the oil inlet of the delivery channel, and the oil outlet of the delivery channel is closed. It is a simplified schematic diagram of the pneumatic nail gun body.

[0021] Figure 6 This is a schematic diagram of the embodiment before the trigger is pulled after operation. The oil inlet of the oil supply channel is closed and the oil outlet of the oil supply channel is open. It is also a simplified schematic diagram of the pneumatic nail gun body.

[0022] Figure 7 This is a schematic diagram of the structure of the embodiment before the trigger is pulled after operation. The oil outlet of the oil supply channel is closed, and the gas-oil mixture at the front end of the valve core is sprayed through the oil spray nozzle. This is a simplified schematic diagram of the pneumatic nail gun body.

[0023] Figure 8 for Figure 4 A sectional view of the actual object. Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] The descriptions of "front" and "rear" in this invention, such as "front end," "rear front," and "rear back," are not intended to limit the positional relationship. They are simply defined as the nail-out nozzle at the front of the gun as "front" and the tail of the gun as "rear," for ease of description and understanding.

[0026] According to the accompanying drawings, a novel pneumatic nail gun includes a gun body 1, which includes a trigger B and a self-lubricating structure 2. The gun body is provided with an air passage A, which is not described here as it is prior art. The self-lubricating structure 2 includes a valve housing 3, with an automatic oil injection device 4 at the front end and an air compensation device 5 at the rear end. An oil storage chamber 6 is provided in the valve housing.

[0027] The automatic fuel injection device 4 includes a front valve cover 7, a valve core 8, and a return spring 9. The front valve cover 7 is connected to the valve housing 3 and has a fuel injection port 10 connected to the air passage. The valve core 8 has a fuel delivery channel 11 inside. The inlet 12 and outlet 13 of the fuel delivery channel 11 are not connected outside the valve core. A third sealing ring 14 is fitted on the outer surface of the valve core between the inlet and outlet, isolating the inlet 12 and outlet 13 outside the valve core, thus preventing them from communicating. A first sealing ring 15 is provided between the inlet 12 and the oil storage chamber 6, and a second sealing ring 16 is fitted on the outlet 13. A step 17 is provided inside the valve housing behind the valve core. The valve core moves between the front valve cover 7 and the step 17. The return spring 9 is located inside the oil storage chamber 6, with one end abutting against the valve core and the other end abutting against the air compensation device. The return spring resets the valve core after it is pushed. The valve housing at the front end of the front valve cover 7 is provided with an air passage 18 that is connected to the air passage A of the pneumatic nail gun body 1. The air passage is connected to the air passage.

[0028] The air compensation device 5 includes a rear valve cover 19 connected to the valve housing. An air supply channel 20 is located within the rear valve cover, containing a ball bearing 21 and an air supply return spring 22. The ball bearing 21 blocks the air supply channel under the action of the air supply return spring 22. An adjusting block 23 is located at the other end of the air supply return spring 22, and this end of the spring rests against the adjusting block, which is threadedly connected to the air supply channel. Moving the adjusting block adjusts the spring force of the air supply return spring. When the pressure in the oil reservoir decreases, the external pressure and the weight of the ball bearing (mainly when the gun body is in use, the butt of the gun is generally facing upwards) together overcome the spring force of the air supply return spring, guiding outside air into the oil reservoir. A transparent oil pipe 24 is located within the oil reservoir 6. An observation window 25 for viewing the oil pipe is located on the valve housing corresponding to the position of the oil reservoir. The return spring 9 is located inside the oil pipe 24.

[0029] The working principle of this embodiment is briefly described below. When the gas passage A of the gun body begins to fill with gas, gas enters through the gas port 18 at the front end of the valve housing, filling the gun body with gas. Figure 4 This causes a rapid increase in air pressure in front of the fuel injector. High-pressure gas enters the front valve cover through the injector, pushing the valve core backward and compressing the return spring. The first sealing ring seals the oil reservoir and the fuel delivery channel, while the second sealing ring acts as a one-way valve, preventing gas from entering the fuel delivery channel through the outlet. When trigger B is pulled, see... Figure 5Gas flows out of the vent at the front of the valve body and exhausts outside the gun body, causing a rapid drop in air pressure in front of the fuel injector. The return spring pushes the valve core forward, connecting the oil reservoir to the inlet of the fuel delivery channel. Lubricating oil enters the fuel delivery channel, but the outlet is still sealed by the second sealing ring. Because the pressure inside the fuel delivery channel is the same as or not significantly different from the pressure outside the second sealing ring, the diameter of the second sealing ring cannot be increased. At this time, the air compensation device starts to work. As the oil reservoir discharges oil into the fuel delivery channel, the pressure in the oil reservoir decreases. Especially when the gun body is in use, with the rear end facing upwards, the ball bearings compress the air replenishment return spring, opening the air replenishment channel and replenishing air to the oil reservoir. The trigger is pulled again, see... Figure 6 When a large amount of high-pressure gas enters the fuel injector, it pushes the valve core backward and compresses the return spring. The first sealing ring seals the oil reservoir and the fuel delivery channel. The space 26 outside the fuel delivery channel inlet is compressed, causing the oil pressure inside the fuel delivery channel to increase. Finally, the diameter of the second sealing ring expands, and fuel is sprayed from the outlet into the cavity 27 in front of the valve core. Because high-pressure gas enters the fuel injector, it cannot spray fuel or cannot spray a large amount of fuel at this time. See Figure 7 When the trigger is released, the air pressure in front of the fuel injector decreases, and the valve core is pushed forward by the return spring, squeezing oil out of the fuel injector. Finally, when the trigger is pulled again, the lubricating oil enters the air circuit with the air to perform its lubricating function. Since this air circuit does not require a large amount of lubricating oil, only a small amount is needed. Therefore, this self-lubricating structure does not require frequent oiling of the oil reservoir.

Claims

1. A novel pneumatic nail gun, comprising a gun body, the gun body having a trigger and an air passage, characterized in that: The gun body is also provided with a self-lubricating structure for oil spraying lubrication of the air circuit. The self-lubricating structure includes a valve shell, an automatic oil spraying device at the front end of the valve shell, an air compensation device at the rear end of the valve shell, and an oil storage chamber in the valve shell. The air compensation device includes a rear valve cover connected to the valve housing. An air supply channel is provided within the rear valve cover, containing a ball bearing and an air supply return spring. The ball bearing blocks the air supply channel under the action of the air supply return spring. An adjusting block is provided at the other end of the air supply return spring, and this end abuts against the adjusting block, which is threadedly connected to the air supply channel. When the pressure in the oil storage chamber decreases, the air compensation device can introduce outside air into the oil storage chamber. The automatic fuel injection device includes a front valve cover, a valve core, and a return spring. The front valve cover is connected to the valve housing and has a fuel injection port. A step is provided in the valve housing behind the valve core, and the valve core moves between the front valve cover and the step. An oil delivery channel is provided inside the valve core, and the oil inlet and outlet of the oil delivery channel are not connected outside the valve core. A third sealing ring is fitted on the outer surface of the valve core between the oil inlet and the oil outlet, which isolates the oil inlet and the oil outlet outside the valve core, thus preventing them from communicating. A first sealing ring is provided between the oil inlet and the oil storage chamber, and a second sealing ring is fitted on the oil outlet. The return spring is located in the oil storage chamber, with one end abutting against the valve core and the other end abutting against the air compensation device. The return spring resets the valve core after it is pushed. The fuel injector is connected to the air passage.

2. The novel pneumatic nail gun according to claim 1, characterized in that: An air passage is provided on the valve housing in front of the front valve cover, and the air passage is connected to the air circuit.

3. The novel pneumatic nail gun according to claim 1, characterized in that: The oil storage chamber is equipped with a transparent oil pipe, and the valve body corresponding to the position of the oil storage chamber is equipped with an observation window for viewing the oil pipe.

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