JPH0616219Y2 - Fuel plug - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to an oil filler plug which is screwed into an oil supply screw hole provided in a main body of a lubricator provided in a pneumatic circuit to seal the screw hole. .

[Prior Art and its Problems] The pneumatic circuit is provided with a lubricator that sprays and mixes an appropriate amount of lubricating oil into compressed air.

Generally, a lubricator is composed of a main body connected to piping of a pneumatic circuit, and a bowl detachably attached to the lower part of the main body for accommodating lubricating oil. The body of the lubricator is provided with a through hole for oil supply that communicates with the outside and the inside of the bowl, and the through hole is always a small screw-shaped screwed into a female screw engraved in the opening on the outside. The inside of the bowl is kept airtight by being closed by an oil filler plug.

There are two ways to replenish the lubricator to such a lubricator: removing the filler plug and pouring the lubricant into the bowl through the refueling through hole, or removing the bowl from the main unit and pouring the lubricant directly into the bowl. is there.

By the way, the replenishing work of the lubricating oil by these methods is often performed during the operation of the pneumatic circuit, that is, during the operation of the air pressure source, in order not to reduce the operating rate of the pneumatic circuit.
In the refilling work performed while the air pressure source is operating, the compressed air in the bowl must be exhausted before the removal of the oil filler plug or the bowl to bring the inside of the pressurized bowl to the atmospheric pressure state. If you try to remove the filler plug or bowl while it is under pressure, there is a risk that the filler plug or bowl will fall out.

In order to exhaust the compressed air in the bowl, the conventional lubricator provided in the lubricator has a notch groove formed along the axial direction in the thread of the shaft portion.

In the replenishment work of lubricating oil, first, a tool is used to rotate the oil supply plug so that the head of the oil supply plug is slightly lifted from the main body of the lubricator. As a result, the end of the cutout groove formed in the shaft portion of the oil filler plug is exposed, and the compressed air in the bowl is discharged to the outside through the through hole for oil supply and the notch groove of the oil filler plug.

Then, after waiting for the inside of the bowl to reach the atmospheric pressure state, the oil supply plug is further rotated to remove it or the bowl is removed to supply the lubricating oil as described above.

As described above, in the conventional oil filler plug, when the lubricating oil is replenished to the lubricator, the compressed air in the bowl is not discharged until the lubricator is rotated several times. It takes a long time until
There was a problem that work efficiency was poor.

Also, when removing the bowl and supplying lubricating oil,
As an operation for exhausting, there is a problem that an operation of rotating the oil supply plug, that is, an operation of loosening a so-called small screw is required, and replenishment work (maintenance work) is very troublesome.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide an oil supply plug which can exhaust the inside of a bowl of a lubricator by a one-touch operation and can shorten the time required to supply lubricating oil to the lubricator. .

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention is a lubrication plug that is screwed into a lubrication screw hole provided in a main body of a lubricator to seal the screw hole, and is a tool for rotating the lubrication plug. The engagement part that engages with, and is normally closed,
An exhaust valve which is opened when a tool is engaged with the engaging portion is provided.

[Action]

The engaging portion engages with a tool for rotating the oil filler plug.

The exhaust valve is normally closed and opens when the tool is engaged with the engaging portion.

As a result, the oil supply screw hole provided in the main body of the lubricator is normally sealed by the oil supply plug screwed into it, and is opened when the tool is engaged with the engaging portion.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front sectional view of a fuel plug 1 according to the present invention, and FIGS. 2A and 2B are perspective views of the fuel plug 1.

The oil filler plug 1 is provided with an exhaust valve 3 inside a small screw-shaped body 2 composed of a thick flat plate-shaped head portion 2a and a shaft portion 2b having a male screw 2c, and a female screw 11a in a lubricator body 10. Is screwed into the screw hole 11 in which is carved to seal the screw hole. The lubricator main body 10 is connected to a pneumatic pressure source, a pneumatic actuator, etc. in a pneumatic circuit (not shown). The screw hole 11 is a passage for oil supply, and communicates with a bowl (not shown) that is detachably attached to the lower portion of the lubricator body 10 as a reservoir for lubricating oil. In addition, 12 is a seal member.

At the center of the body 2, a spring seat chamber 5a, a communication chamber 5b,
Also, a through hole 5 having a valve seat chamber 5c and penetrating in the axial direction is formed, and a through hole 6 communicating with the through hole 5 and the outside is bored in the head 2a.

A rod-shaped valve body 7 is housed in the through hole 5, and the valve body 7
A large diameter portion 7a having a conical shape is formed at the lower end of the valve body, and a slidable knob 8 inserted into the through hole 5 is fixed to the upper end of the valve body 7.

The exhaust valve 3 is constituted by the through hole 5, the through hole 6, the valve body 7, the knob 8, and the spring 9 for urging the valve body 7.

Normally, the valve body 7 is pushed up together with the knob 8 by the urging force of the spring 9, the large diameter portion 7a contacts the valve seat 5d, and the exhaust valve 3 is closed. At this time, the upper portion of the knob 8 slightly projects from the upper surface of the body 2.

On the other hand, on the upper surface of the body 2, a linear engagement groove 4 that engages with a tool described later for rotating the fuel plug 1 is provided.
It is formed along the diametrical direction so as to straddle the through hole 5.

Next, a procedure for supplying lubricating oil to the lubricator having the oil filler plug 1 having the above configuration will be described.

As described above, the exhaust valve 3 is normally closed, and the fuel plug 1
Keeps the inside of the bowl airtight.

When replenishing the lubricating oil during operation of the air pressure source, the operator first closes the valve (not shown) arranged on the primary side of the lubricator so that compressed air does not leak during replenishment. . However, when the lubricator main body 10 is provided with a mechanism for closing the flow paths between the primary side and the secondary side and the inside of the bowl when the pressure inside the bowl is reduced, the valve operation can be omitted.

Subsequently, the worker evacuates the compressed air in the bowl,
Perform the operation to reduce the bowl internal pressure. As an operation for this exhaust treatment, the operator, as shown in FIG.
Screwdriver with a flat end (so-called flathead screwdriver)
It is only necessary to engage 20 with the engagement groove 4. That is, the exhaust process can be performed by a one-touch operation.

That is, in the oil filler plug 1, when the screwdriver 20 is engaged with the engagement groove 4, the valve body 7 together with the knob 8 has the screwdriver 20.
Is pushed down against the biasing force of the spring 9 and the internal pressure of the bowl by the tip of the exhaust valve 3, whereby the exhaust valve 3 is opened and the compressed air in the bowl is discharged to the outside through the screw hole 11, the through hole 5, and the through hole 6. Is discharged. The operator turns the screwdriver 20 into the engaging groove 4.
By engaging with and rotating the oil supply plug 1, the compressed air in the bowl is discharged by the time the oil supply plug 1 is disengaged from the female screw 11a, and the lubricating oil supply operation can be performed quickly. Note that, for safety, the filler valve 1 may be rotated after waiting for the compressed air in the bowl to be discharged.

Further, when lubricating oil is directly fed to the bowl, the bowl is removed from the lubricator main body 10 while the screwdriver 20 is engaged with the engagement groove 4 and the bowl internal pressure is lowered, and then the lubricating oil is fed. That is, when directly supplying oil to the bowl, it is not necessary to rotate the oil supply plug 1. When the screwdriver 20 is separated from the engagement groove 4, the exhaust valve 3 is closed by the biasing force of the spring 9.

According to the above-described embodiment, since the upper portion of the knob 8 of the exhaust valve 3 is always made to project from the upper surface of the filler valve 1, the exhaust valve can be easily operated by a finger of a worker or the like without using a tool. 3 can be opened and closed.

In the above-described embodiment, an example in which the linear engagement groove 4 that engages with the flat blade screwdriver is formed as the engaging portion that engages with the tool for rotating the oil filler plug 1 has been shown. When using other things such as a hexagon wrench and a Phillips screwdriver, the shape of the engaging portion may be changed according to the tool. For example, when using a hexagon wrench, the through hole 5
The plane shape of the spring seat chamber 5a may be hexagonal. When using a plus driver, the engagement groove 4 may be formed in a cross shape.

The structure of the exhaust valve 3 is not limited to the illustrated one,
It is normally closed and may be opened as long as a tool for rotating the oil filler plug 1 is engaged, and various changes are possible.

[Effect of device]

According to the present invention, the inside of the bowl of the lubricator can be evacuated by one-touch operation, and the work time for supplying the lubricator to the lubricator can be shortened.

[Brief description of drawings]

FIG. 1 is a front sectional view of a fuel plug according to the present invention, and FIGS. 2 (a) and 2 (b) are perspective views of the fuel plug. DESCRIPTION OF SYMBOLS 1 ... Oil filler plug, 3 ... Exhaust valve, 4 ... Engaging groove (engaging portion), 10
… Lubricator body (lubricator body), 11… screw holes, 20… screwdriver (tool).

Claims (1)

[Scope of utility model registration request] 1. An oil filler plug which is screwed into a screw hole for oil supply provided in a main body of a lubricator to seal the screw hole, and an engaging portion which engages with a tool for rotating the oil stopper. An oil supply plug, which is normally closed and is provided with an exhaust valve that opens when a tool is engaged with the engaging portion.