JP3543634B2 - Air supply / exhaust system for pneumatic tools - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an air supply / exhaust system for a pneumatic tool, and more particularly to an air supply / exhaust system for a pneumatic tool that reduces exhaust noise of the pneumatic tool and prevents scattering of dust due to an exhaust flow.
[0002]
Problems to be solved by the prior art and the invention
In general, tools such as pneumatic nailers and staples are equipped with an exhaust port at the head of a housing that has a built-in pneumatic cylinder for driving a driver. , And the piston is returned to the standby position by exhausting the compressed air on the back side of the air from the exhaust port to the atmosphere. Therefore, the compressed air is exhausted at a short distance from the worker holding the pneumatic tool, so that the sound pressure felt by the worker is high, and fatigue due to exhaust noise cannot be ignored. In addition, there is a problem that the airflow spouted from the exhaust port blows up dust, sawdust and the like in the surroundings to deteriorate the working environment.
[0003]
As a proposal for solving the above-mentioned problem, a pipe joint of a pneumatic tool and an air hose has a coaxial double-pipe structure, a central passage is an air supply passage, and an external passage surrounding the central passage is an exhaust passage. No. 50-27608).
[0004]
The pipe joint described here has a structure in which pressurized air from an air compressor is supplied to an air chamber of a pneumatic tool through a central passage of the pipe joint, and exhaust air after driving an air cylinder is discharged through an external passage of the pipe joint. It is. The air hose connected to the pneumatic tool via a pipe joint has a coaxial double pipe structure in which an external hose is provided on the outer circumference of the air supply hose up to a certain length from the pipe joint. It is finished and the end of the external hose is open. Therefore, the exhaust air after driving the air cylinder is discharged to the atmosphere from the open end of the external hose through the external passage of the pipe joint and the external hose of the air hose.
[0005]
When the above-mentioned pipe joint and the coaxial air hose are used, the exhaust port is kept away from the worker by the coaxial air hose, so that the noise felt by the worker is reduced, and dust and the like are not blown up in front of the worker's face. However, since there is almost no noise reduction effect, the absolute volume of the exhaust sound is not much different from that of directly exhausting from the pneumatic tool, and when the air hose is routed to the floor, the end exhaust of the external hose in contact with the floor is exhausted. The amount of dust and the like scattered by the exhaust from the mouth may be larger than that scattered directly from the pneumatic tool.
[0006]
Therefore, there arises a technical problem to be solved in order to reduce the absolute volume of the exhaust sound and the exhaust flow velocity to suppress the scattering of noise and dust as much as possible, and the present invention solves the above problem. The purpose is to do.
[0007]
[Means for Solving the Problems]
The present invention is proposed to achieve the above object, and the invention according to claim 1 is to provide a pneumatic tool having a pneumatic cylinder therein with a coaxial pipe joint having a double pipe structure, and a central passage of the coaxial pipe joint. Is connected to an air chamber in the pneumatic tool, and an exhaust pipe connecting the external passage of the coaxial joint and the exhaust port of the pneumatic cylinder is provided, and the exhaust air is discharged through the external passage of the coaxial joint. In a pneumatic tool air supply / exhaust system comprising: a muffler having a muffling material and a muffling chamber, a pipe joint and a coaxial pipe joint are provided, and an air passage of the pipe joint is connected to a center passage of the coaxial pipe joint. A relay pipe is provided to allow the external passage of the coaxial pipe joint to communicate with the muffle chamber, and the coaxial pipe joint of the pneumatic tool and the coaxial pipe joint of the muffler are connected by a coaxial air hose having a double pipe structure. Square of the pipe joint of the pipe joint and an air compressor there is provided an air supply / exhaust system of the pneumatic tool configuration connecting via the air hose, the invention of claim 2, wherein the muffling chamber of the muffler, An air supply / exhaust system for a pneumatic tool is provided, wherein a baffle plate is provided for impinging an exhaust stream flowing into a muffling chamber, and lubricating oil contained in the exhaust of the pneumatic tool is trapped by the baffle plate. .
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of an air supply / exhaust system of a pneumatic tool. 1 is an air compressor, 2 is a silencer, and 3 is a pneumatic nailer. The air compressor 1 and the silencer 2 are connected by an air hose 4, and the silencer 2 and the pneumatic nailer 3 are connected by a coaxial air hose 5. The high-pressure air sent from the air compressor 1 is supplied from the air hose 4 to the pneumatic nailing machine 3 through the relay passage of the muffler 2 and the center hose of the coaxial air hose 5, and the discharged air of the pneumatic nailing machine 3 is supplied to the coaxial air hose 5. The gas is discharged from the silencer 2 to the atmosphere via an external hose.
[0009]
FIG. 2 shows the silencer 2 in which a small-diameter portion 6a formed at one end (left side in FIG. 1) of an inner cylinder 6 which is a straight pipe and a flange 6b provided with a vent hole provided at the other end are circular. The end plates 7 and 8 are mounted, a cylindrical outer cover 9 surrounding the inner cylinder 6 is sandwiched between the edges of the two end plates 7 and 8, and a plurality of holes provided in the two end plates 7 and 8 are provided. , And a nut 11 is fixed to both ends of the stay bolt 10 by tightening. The outer cover 9 is provided with a number of exhaust holes (not shown), and a space between the outer cover 9 and the stay bolt 10 is filled with a sound absorbing material 12 such as felt.
[0010]
A socket 13 of a coaxial double pipe joint (hereinafter referred to as a coaxial socket) is screwed into an end of the inner cylinder 6 on the flange 6b side, and a plug 14 of a general single pipe joint is screwed into the other end. The central passage 13 a of the coaxial socket 13 communicates with the central passage 14 a of the plug 14 through the internal passage 6 c of the inner cylinder 6, and the outer passage 13 b of the coaxial socket 13 communicates with the ventilation hole 6 d of the flange 6 b of the inner cylinder 6 and the outer cover 9. It communicates with the atmosphere through the exhaust hole.
[0011]
The coaxial socket 13 is connected to the coaxial plug 15 of the coaxial air hose 5, the coaxial socket at the other end of the coaxial air hose 5 is connected to the coaxial plug of the pneumatic nailing machine 3, and the plug 14 is connected to the socket of the air hose 4 (not shown). ) And connect the plug at the other end of the air hose 4 to the socket of the air compressor.
[0012]
FIG. 3 shows the pneumatic nailing machine 3, in which a coaxial plug 15 is mounted at an end of a grip portion 16, and a central passage 15 a of the coaxial plug 15 communicates with an air chamber 17 in the grip portion 16. The external passage 15 b communicates with an exhaust port 20 on the head side of the pneumatic cylinder 19 via an exhaust pipe 18 passing through the grip portion 16. The compressed air sent out by the air compressor 1 is supplied to the air chamber 17 of the pneumatic nailing machine 3 via the air hose 4, the internal passage of the silencer 2, and the center hose 5a of the coaxial air hose 5.
[0013]
The structure and operating principle of the pneumatic nailing machine 3 are well known and will be briefly described. However, when the trigger lever 21 is pulled, the pilot pressure acting on the upper surface of the head valve 22 of the pneumatic cylinder 19 is discharged, and The valve 22 rises from the lowered position shown in FIG. 3, and pressurized air flows from the air chamber 17 into the head-side air chamber of the pneumatic cylinder 19. As a result, the piston 23 and the driver 24 rapidly descend in the cylinder, and the driver 24 hits the nail in the nose portion 25 and drives the nail into wood or the like.
[0014]
When the trigger lever 21 is returned after the driving, the pilot pressure is applied to the upper surface of the head valve 22, the head valve 22 is lowered by the pilot pressure, and the communication between the air chamber 17 and the pneumatic cylinder 19 is cut off. A port 20 communicates with the exhaust line 18. As a result, the compressed air in the head-side air chamber passes from the exhaust pipe 18 into the outer hose 5b of the coaxial air hose 5 and the outer passage 13b of the coaxial socket 13 of the muffler 2, and is conveyed by the inner cylinder 6 and the outer cover 9. The sound is reduced in the formed silencing chamber and discharged to the atmosphere through the sound absorbing material 12 and the exhaust holes of the outer cover 9.
[0015]
As described above, since the exhaust air of the pneumatic tool 3 is discharged through the silencer 2 at a location away from the operator, the absolute volume of the exhaust sound is reduced, and especially the exhaust volume heard by the operator is significantly reduced. Further, since the flow rate of the exhaust gas is reduced by the muffler 2, even when the muffler 2 is placed on the floor, the dust and the like on the floor are less scattered, which is sanitary. By installing the device at a place where there is little or the like or at a position higher than the floor, scattering of dust and the like can be further prevented.
[0016]
FIG. 4 shows an embodiment of the muffler according to the second aspect of the present invention. This muffler 31 has a cup-shaped baffle plate 34 inserted between end plates 32 and 33 at both ends to form an inner cover 35 inside the outer cover 35. Is divided into two rooms. The baffle plate 34 is for catching mist oil droplets of lubricating oil contained in the exhaust air of the pneumatic nailing machine. The baffle plate 34 has a center hole inserted into a small diameter portion 36 a formed in the inner cylinder 36 and a cup portion. The end surface of 34a is in contact with the inner side surface of the end plate 33 on the coaxial socket 13 side, and is sandwiched and fixed between the inner cylinder 36 and the end plate 33.
[0017]
A plurality of ventilation holes 34b are formed in the baffle plate 34, and stay bolts 37 connecting the end plates 32, 33 at both ends pass through the ventilation holes 34a. The exhaust gas flowing from the external passage 13b of the coaxial socket 13 into the space between the end plate 33 and the baffle plate 34 collides with the baffle plate 34, and mist oil droplets contained in the exhaust adhere to the baffle plate 34. I do. Then, the air from which most of the oil droplets have been removed passes through the sound absorbing material 38 from the ventilation hole 34b of the baffle plate 34 and is discharged to the atmosphere from the exhaust hole of the outer cover 35. Therefore, the oil droplets are prevented from being scattered around and the oil droplets are prevented from being contaminated by the oil droplets, and the sound absorbing material 38 is reduced in dirt and clogging, so that the service life is extended.
[0018]
It should be noted that the present invention is not limited to the above embodiments, and various modifications are possible within the technical scope of the present invention, and it is natural that the present invention extends to those modified ones.
[0019]
【The invention's effect】
As described above, according to the first aspect of the present invention, the exhaust air of the pneumatic tool is guided to the muffler located away from the operator through the coaxial air hose, and the exhaust air is passed through the air chamber and the muffler of the muffler. Is configured to be discharged from the muffler to the atmosphere, so that the absolute volume of the exhaust sound is reduced, and in particular, the exhaust volume heard by the operator is significantly reduced. Furthermore, since the flow velocity of the exhaust stream is reduced by the silencer having the silencing material and muffling chamber, even when placing the muffler on the floor, also almost eliminated be scattered on the floor of the dust, and By installing the muffler in a place with less dust or higher than the floor, it is possible to further prevent scattering of dust, etc., and to improve the work environment such as noise and hygiene problems. Contribute.
According to a second aspect of the present invention, a baffle plate for colliding an exhaust gas flowing into the muffler chamber is provided in the muffler chamber of the muffler. A mist of oil droplets contained in the exhaust of the tool is captured and adhered by the baffle plate. Then, the air from which most of the oil droplets have been removed passes from the baffle plate through the silencer, and is discharged from the silencer to the atmosphere. Therefore, the oil droplets are prevented from being scattered around the periphery, the surroundings are prevented from being contaminated by the oil droplets, and the dirt and clogging of the silencer is reduced, and the service life of the silencer is extended. To play.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an exhaust system of a pneumatic tool according to the present invention.
FIG. 2 is a cross-sectional view of the muffler.
FIG. 3 is a sectional view of a pneumatic nailer.
FIG. 4 is a sectional view showing another embodiment of the muffler.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air compressor 2 Silencer 3 Pneumatic nailer 4 Air hose 5 Coaxial air hose 5a Center hose 5b External hose 6 Inner cylinder 7, 8 End plate 9 Outer cover 12 Sound absorbing material 13 Coaxial socket 14 Plug 15 Coaxial plug 18 Exhaust line 19 Air pressure Cylinder 20 Exhaust port 22 Head valve 31 Silencer 32, 33 End plate 34 Baffle plate 35 Outer cover 36 Inner cylinder

Claims (2)

A pneumatic tool incorporating a pneumatic cylinder is provided with a coaxial pipe joint having a double pipe structure, a center passage of the coaxial pipe joint is communicated with an air chamber in the pneumatic tool, and an external passage of the coaxial pipe joint and an exhaust port of the pneumatic cylinder are provided. An air supply / exhaust system for a pneumatic tool, wherein the air supply / exhaust system is provided with an exhaust line connecting
A pipe joint and a coaxial pipe joint are provided in a muffler having a silencer and a muffling chamber, a relay pipe connecting an air passage of the pipe joint and a center passage of the coaxial pipe joint is provided, and an external passage of the coaxial pipe joint is provided. To the silencer chamber,
An air pressure having a configuration in which a coaxial pipe joint of a pneumatic tool and a coaxial pipe joint of a silencer are connected by a coaxial air hose having a double pipe structure, and the other pipe joint of the silencer and a pipe joint of an air compressor are connected via an air hose. Tool air supply / exhaust system. In the muffler chamber of the muffler, a baffle plate for colliding an exhaust gas flowing into the muffler chamber is provided,
2. The air supply / exhaust system for a pneumatic tool according to claim 1, wherein the lubricating oil contained in the exhaust of the pneumatic tool is trapped by a baffle plate.

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