JP3835078B2 - Nailer exhaust - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust device for a nailing machine, and more particularly, to an exhaust system for a nailing machine in which exhaust pressure and exhaust flow velocity are reduced.
[0002]
[Problems to be solved by the invention]
The nailing machine forms an exhaust chamber in a head cover mounted on the head of a pneumatic cylinder or on the outer periphery of the pneumatic cylinder, and exhausts high-pressure air in the pneumatic cylinder from an exhaust port through the exhaust chamber.
[0003]
The high-pressure air discharged from the nailing machine blows up the surrounding dust and makes the operator uncomfortable, so an air filter such as wool is installed in the vicinity of the exhaust port to reduce the exhaust pressure and flow speed. However, the air filter hardly provides a pressure reduction effect. Further, if the capacity of the exhaust chamber is increased, an improvement in the pressure reduction effect can be expected, but there arises a problem that the nailing machine itself is increased in size.
[0004]
Therefore, a technical problem to be solved in order to improve the exhaust structure of the nailing machine and improve the pressure reduction effect arises, and the present invention aims to solve the above problem.
[0005]
[Means for Solving the Problems]
The present invention is proposed in order to achieve the above object, and includes a throttle portion that narrows the cross-sectional area of the passage just before the end of the exhaust passage of the nailing machine, and a diffusion rectifying portion that diffuses the exhaust flow over the entire exhaust port. In the exhaust device of the nailing machine configured to reduce the exhaust pressure and flow velocity,
A rectifying baffle portion is disposed on the inner surface of the exhaust port, and a part of the exhaust flow from the throttle portion toward the discharge port is deflected laterally to diffuse the exhaust flow over the entire width of the discharge port. Nailing machine exhaust device,
Also, a nail driving device configured to reduce the exhaust pressure and flow velocity by providing a throttle unit that narrows the cross-sectional area of the passage just before the end of the exhaust passage of the nailing machine and a diffusion rectification unit that diffuses the exhaust flow over the entire exhaust port. In the exhaust system of the machine ,
The exhaust port is formed by forming a leg portion that fits into the housing and notching the lower left and right side lower edges of the skirt portion of the inverted cup-type head cover that is screwed to the housing head through a screw insertion hole, An exhaust device for a nailing machine is provided in which an internal gear-like throttling / rectifying portion is formed on the entire inner periphery of the head cover except the boss portion around the screw insertion hole .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a part of a pneumatic nailer, 1 is a housing, 2 is a pneumatic cylinder in the housing, and 3 is a trigger lever. The internal space of the grip part 4 and the space on the upper outer periphery of the pneumatic cylinder 2 communicating with the air chamber 5 are the air chamber 5, the lower outer periphery of the pneumatic cylinder 2 is the blowback chamber 6, Is provided.
[0007]
The pressure of the air chamber 5 acts on the lower surface of the ring-shaped head valve 8 mounted on the head of the pneumatic cylinder 2, and the pressure of the air chamber 5 acts on the upper surface through the trigger valve 9 and the pilot pipe line 10. ing.
[0008]
Due to the difference in pressure receiving area between the upper and lower surfaces of the head valve, the head valve 8 is in the lowered position shown in FIG. 1 when the trigger is off, and when the trigger lever 3 is operated, the stem of the trigger valve 9 is pushed to the upper surface of the head valve 8. The working pressure air is discharged. As a result, the head valve 8 is raised and high pressure air is supplied from the air chamber 5 to the head side air chamber of the pneumatic cylinder 2, and the piston 11 and the piston rod 12 are lowered in the pneumatic cylinder 2 and connected to the lower portion of the housing 1. A nail in a nose portion (not shown) is ejected.
[0009]
When the trigger lever 3 is returned to the OFF position, pressurized air is supplied to the upper surface of the head valve 8 and the head valve 8 is lowered to the position shown in the figure, and the air chamber 5 and the head side air chamber of the pneumatic cylinder 2 are shut off. At the same time, the head side air chamber communicates with the exhaust chamber 7. The piston 11 is raised by the pressure of the air accumulated in the blowback chamber 6 on the outer periphery of the lower part of the cylinder, and the pressure air in the head side air chamber is exhausted from the exhaust chamber 7 to the atmosphere.
[0010]
As shown in the front sectional view of FIG. 2 and FIG. 3, exhaust port panels 14 are mounted in panel mounting holes 13 formed on the left and right side surfaces of the housing 1, and exhausted by rubber bands 15 attached to the outer periphery of the housing 1. The mouth panel 14 is fixed. As shown in FIG. 4, a number of slit-type exhaust ports 16 are arranged in parallel on the exhaust port panel 14, and the air in the exhaust chamber 7 is discharged to the atmosphere through the large-area exhaust ports 16.
[0011]
As shown in FIGS. 2 and 3, a throttle portion 17 is formed in the panel mounting hole 13 of the housing 1 so as to oppose the vicinity of the upper end of the exhaust port panel 14, and the air flow in the exhaust chamber 7 is restricted to the throttle portion 17. Squeeze to slow down. Further, a flange-shaped rectifying baffle portion 18 is provided on the inner surface of the exhaust port panel 14 at a position above the exhaust port 16, and a part of the air flow from the throttle portion 17 toward the exhaust port 16 is deflected laterally to the exhaust port. The air flow is configured to diffuse over the entire width of 16. That is, the pressure and flow velocity of the exhaust gas are reduced by reducing the pressure of the high-pressure air in the exhaust chamber 7 by the throttle unit 17 and further diffusing the entire width of the plurality of exhaust ports 16 by the rectifying baffle unit 18. An air filter 19 is filled in the space between the lower portion of the exhaust port panel 14 and the housing 1 to remove oil droplets contained in the exhaust gas and prevent external dust from entering.
[0012]
FIG. 5 shows a configuration of a nailing machine that exhausts air from the exhaust port of the head cover as another embodiment. In FIG. 5, 21 is a housing, 22 is a pneumatic cylinder, 23 is a piston, 24 is a head valve, and 25 is an inverted cup type head cover.
[0013]
As shown in the bottom view of FIG. 6, three screw insertion holes 26 are formed in the head cover 25 and are attached to the head of the housing 21 with three screws. A boss 27 around the screw insertion hole 26 contacts the top surface of the housing 21.
[0014]
As shown in FIGS. 6 and 7, leg portions 28 that are fitted to the housing 21 are formed at the front, rear, left and right four locations on the bottom surface of the head cover 25, and the portions where the left and right lower edges of the skirt portion 29 are notched are the exhaust ports 30. Become. As shown in FIG. 6, an internal gear-shaped restrictor / rectifier 31 is formed on the upper portion of the inner peripheral surface of the head cover 25 in a portion excluding the boss 27.
[0015]
In FIG. 5, the left half shows a standby state in which the head valve 24 is in the lowered position, and the right half shows a state in which the head valve 24 is raised and the cylinder is driven. When the head valve 24 returns from the raised position to the lowered position after driving the piston, high-pressure air in the head-side air chamber of the pneumatic cylinder 22 is jetted into the head cover 25 through the vent 32 formed in the top surface of the housing 21.
[0016]
The air discharged into the head cover 25 is throttled by the diaphragm / rectifier 31 arranged in the form of an internal gear, and is averaged in the entire circumferential direction excluding the boss 27 by the rectifying action of the diaphragm / rectifier 31. It is diffused and discharged from the exhaust port 30 to the atmosphere, and the exhaust pressure and flow velocity are reduced as in the previous embodiment.
[0017]
The present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope of the present invention, and it is natural that the present invention extends to those modifications.
[0018]
【The invention's effect】
As described above, an exhaust device of the nail gun of the present invention, since the exhaust is diffused throughout the exhaust port together with the squeezing by squeezing the exhaust, the exhaust pressure and flow rate enhancing usability decreases, claim 1 In the described invention, a rectifying baffle portion is disposed on the inner surface of the exhaust port, and a part of the exhaust flow from the throttle portion toward the discharge port is deflected laterally to diffuse the exhaust flow over the entire width of the discharge port. Therefore, the exhaust gas is once depressurized by the throttle unit, and further diffused over the entire width of the plurality of exhaust ports by the rectifying baffle unit, thereby reducing the exhaust pressure and flow velocity.
In the second aspect of the present invention, the air discharged into the head cover is throttled by the throttle / rectifier portion arranged in the form of an internal gear, and the entire circumference direction excluding the boss portion by the rectifying action of the throttle / rectifier portion Since the gas is diffused on the average and discharged from the exhaust port to the atmosphere, the exhaust pressure and flow velocity are efficiently reduced.
In addition, a large-capacity exhaust chamber is unnecessary, and the invention contributes to downsizing of the nailing machine.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a nailing machine.
FIG. 2 is a front sectional view of the nailing machine.
FIG. 3 is a view taken along the line AA in FIG. 2;
FIG. 4 is a front view of an exhaust port panel.
FIG. 5 is a side sectional view of a head portion of a nailing machine according to another embodiment.
6 is a bottom view of the head cover of the nailing machine of FIG. 5. FIG.
7 is a side view of the head cover of the nail driver of FIG. 5. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Pneumatic cylinder 5 Air chamber 6 Blowback chamber 7 Exhaust chamber 8 Head valve 13 Panel attachment hole 14 Exhaust port panel 15 Rubber band 16 Exhaust port 17 Restriction part 18 Current baffle part 25 Head cover 26 Screw hole 27 Boss part 29 Skirt part 30 Exhaust port 31 Restrictor / rectifier

Claims (2)

A nailing machine configured to reduce the exhaust pressure and flow velocity by providing a throttle part for reducing the cross-sectional area of the passage just before the end of the exhaust passage of the nailing machine and a diffusion rectifying part for diffusing the exhaust flow to the entire exhaust port. in the exhaust system,
A rectifying baffle portion is disposed on the inner surface of the exhaust port, and a part of the exhaust flow from the throttle portion toward the discharge port is deflected laterally to diffuse the exhaust flow over the entire width of the discharge port. Nailing machine exhaust system. A nailing machine configured to reduce the exhaust pressure and flow velocity by providing a throttle part for reducing the cross-sectional area of the passage just before the end of the exhaust passage of the nailing machine and a diffusion rectifying part for diffusing the exhaust flow to the entire exhaust port. In the exhaust system ,
The exhaust port is formed by forming a leg portion that fits into the housing, and is formed by notching the lower left and right lower edges of the skirt portion of the inverted cup-type head cover screwed to the housing head through a screw insertion hole, An exhaust device for a nailing machine, characterized in that an internal gear-like throttling / rectifying portion is formed on the entire inner periphery of the head cover except the boss portion around the screw insertion hole.

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