JPH10277906A - Water injection type air sander - Google Patents

Abstract

(57) [Summary] [Problem] To prevent dust from rising reliably and effectively, to maintain good lubricity between a wheel cutter and a coating surface, etc., and to perform troublesome work of maintenance and inspection of a dust collector. The present invention provides a water-jet air sander capable of efficiently performing cutting work without the need for an air sander. SOLUTION: In a sander main body 1, a wind turbine 5 which is rotated by the injection pressure of high-pressure air is provided, a shaft portion 6 of the wind turbine 5 is projected outside the sander main body 1, and a wheel cutter 10 is attached to the projected portion. A water pipe 17 communicating with the inside of the wheel cutter 10 is provided in the sander main body 1, and water is injected into the wheel cutter 10 through the water pipe 17 when the wheel cutter 10 rotates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet air sander used for surface preparation of an outer wall of a building, for example, when repairing a building.

[0002]

2. Description of the Related Art A sander is used for cutting off a coating film on the outer wall of a building. In this type of conventional sander, a cup-shaped wheel cutter is rotated using an electric motor or high-pressure air, and the wheel cutter is used to cut and remove the coating film.

[0003] Here, when the coating film is cut by a wheel cutter, dust generated by the cutting soars around and scatters, thereby deteriorating the working environment. Therefore, the outer circumference on one side of the wheel cutter is covered with a cover, a suction hose led out of a dust collector separate from the sander is connected to the cover, and dust accompanying the cutting of the coating film passes through the suction hose from inside the cover through the suction hose. Means for sucking into the inside may be employed.

[0004]

However, the dust resulting from the cutting of the coating film is fine and dry, so that it is difficult to sufficiently remove the dust by means of suction, and considerable dust scatters around the outer periphery of the cover. The surface of the film is dry, and there is no lubricity between the wheel cutter and the surface of the film.Therefore, smooth rotation of the wheel cutter cannot be obtained, resulting in a decrease in work efficiency. In addition, the friction between the wheel cutter and the coating film surface causes the temperature of the wheel cutter to become high, which causes a reduction in the life of the wheel cutter.

Further, the use of the dust collector causes a problem of clogging inside the dust collector, which requires periodic cleaning of the dust collector, which requires troublesome work for maintenance and inspection.

The present invention has been made in view of such a point, and it is an object of the present invention to reliably and effectively suppress the sowing of dust and to reduce the distance between a wheel cutter and a paint film surface. It is an object of the present invention to provide a water-jet air sander which can maintain the lubrication of the satisfactorily and does not require the troublesome work of maintenance and inspection of the dust collector, and can efficiently carry out the cutting work.

[0007]

According to the present invention, in order to achieve the above object, a windmill which is rotated by the injection pressure of high-pressure air is provided in a sander main body, and a shaft portion of the windmill is provided outside the sander main body. The wheel cutter was attached to the projecting portion, and a water passage communicating with the inside of the wheel cutter was provided in the sander main body. When the wheel cutter was rotated, water was injected into the wheel cutter through the water passage. Things.

[0008] Particularly, in the invention of claim 2,
A reflecting plate is provided inside the wheel cutter to scatter water jetted from the water passage toward the inner peripheral surface of the wheel cutter.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention, in which reference numeral 1 denotes a sander main body, and the sander main body 1 includes a base 2 and a base 2
And a handle portion 3 extending horizontally from the side of the handle.

A windmill room 4 is formed inside the lower portion of the base 2, and a windmill 5 is housed in the windmill room 4. Windmill 5
Consists of a hollow shaft portion 6 and a windmill blade 7 attached to the outer periphery of the shaft portion 6. The upper and lower portions of the shaft portion 6 are rotatably supported by the base 2 via bearings 8. ing.

The lower end of the shaft 6 projects below the base 2,
A holder 9 is attached to the protruding end, and a flat cup-shaped wheel cutter 10 is detachably attached to the holder 9 via a nut 11.

An air supply passage 12 is formed inside the sander body 1, and one end of the air supply passage 12 communicates with a connection pipe 13 attached to the rear end of the handle portion 3, and the other end of the air supply passage 12 is connected to the windmill chamber 4. Communicates within.

An air supply hose 14 derived from a high-pressure air pump (not shown) is connected to the connection pipe 13, and the air supply hose 14 and the air supply path 1 are connected via the high-pressure air pump.
High-pressure air is sequentially sent into the wind turbine chamber 4 through 2, and the wind turbine 5 rotates integrally with the wheel cutter 10 by the injection pressure of the air. A discharge port 15 for discharging air in the windmill chamber 4 is formed on a side surface of the base 2.
At the lower end of the base 2, a cover 16 that covers the front half of the wheel cutter 10 is attached.

A water pipe 17 is inserted into the base 2 from the upper part to the lower part. The upper end of the water pipe 17 is joined to a connection pipe 18 attached to the upper end of the base 2, and the lower end of the water pipe 17 is located at the center of the shaft 6 of the wind turbine 5. It penetrates through the hollow hole 6a and protrudes inside the wheel cutter 10.

The lower end surface of the water pipe 17 projecting into the wheel cutter 10 is opened as a spray port 17a. The reflecting plate 19 faces the spray port 17a.
Are attached to the water pipe 17 via a plurality of stays 20.

Connection pipe 1 attached to upper end of base 2
8, a water supply hose 21 derived from a water pump (not shown) is connected, and the water pipe 1 is connected to the water supply hose 1 via the water pump.
Water is sequentially fed into the inside 7, and the water is jetted from the jet port 17 a at the lower end of the water pipe 17 toward the reflection plate 19.

The outer peripheral surface of the water pipe 17 and the windmill 5
A small gap is provided between the shaft portion 6 and the inner peripheral surface of the hollow hole 6a of the shaft section 6.
7, so that the windmill 5 can rotate freely.

When using the water-jet type air sander constructed as described above, air is jetted into the windmill room 4 to rotate the wheel cutter 10 together with the windmill 5 and to feed water into the water pipe 17. Then, the reflection plate 1 is
Spray water towards 9.

Then, the handle portion 3 is handled, and the wheel cutter 10 is pressed against, for example, the coating surface of the outer wall of the building, and the coating is cut and removed. The water jetted from the jet port 7a hits the reflecting plate 19,
Are scattered on the inner peripheral surface of the wheel cutter 10 and further become mist-like water droplets by the rotation of the wheel cutter 10 and diffused throughout the wheel cutter 10.

Therefore, moisture is contained in the dust of the coating film due to the cutting by the wheel cutter 10, and therefore the dust is quickly calmed down without vigorously rising. Then, the mist-like water droplets diffused into the wheel cutter 10 bring the surface of the coating film to be cut by the wheel cutter 10 into a wet state, so that the lubricity between the wheel cutter 10 and the coating film surface is well maintained. As a result, the wheel cutter 10 rotates smoothly, and an efficient cutting operation can be achieved.

The water injected into the wheel cutter 10 cools the wheel cutter 10, and the cooling prevents an excessive rise in temperature of the wheel cutter 10, thereby preventing a reduction in the life of the wheel cutter 10.

Further, since the wheel cutter 10 is driven by the injection pressure of air without using an electric motor,
Since the whole is lightweight and convenient for handling, and a dust collector for sucking the dust of the coating film can be omitted, the troublesome work of maintenance and inspection of the dust collector is unnecessary, and the cutting work can be further efficiently performed.

The present invention is not limited to the above-described embodiment. For example, as shown in FIG. 3 as a second embodiment, water injected from an injection port 17a of a water pipe 17 is A reflector 19 that scatters toward the peripheral surface is attached to the wheel cutter 10 via a plurality of stays 20. Alternatively, as shown in a third embodiment in FIG. Closes the end face of the lower end of the water pipe 17 protruding inward, and forms one or a plurality of lateral injection ports 17a on the peripheral surface, and from the injection port 17a toward the inner peripheral surface of the wheel cutter 10. And spraying water.

The air sander of the present invention is not limited to the case where the coating film is cut and removed, but also the case where the foreign material layer adhering to the outer wall surface or the floor wall surface of the building is cut and removed. It goes without saying that it can be used.

[0025]

As described above, according to the air sander of the present invention, the soaring of dust can be reliably and effectively suppressed, so that a good working environment can be maintained, and the wheel cutter and the paint film surface can be kept in good condition. The lubricating property can be improved during the operation, so that the wheel cutter can be smoothly rotated to improve the workability, and the troublesome work of maintenance and inspection of the dust collector is not required. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a water injection type air sander according to a first embodiment of the present invention.

FIG. 2 is a plan view of the air sander.

FIG. 3 is a sectional view of a water injection type air sander according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a water injection type air sander according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sander main body 4 ... Windmill room 5 ... Windmill 6 ... Shaft part 7 ... Windmill blade 10 ... Wheel cutter 12 ... Air supply path 17 ... Water pipe 19 ... Reflector

Claims (2)

[Claims] 1. A windmill that rotates by the injection pressure of high-pressure air is provided in a sander main body, a shaft portion of the windmill protrudes outside the sander main body, and a wheel cutter is attached to the protruding portion. A water jet air sander, comprising: a water passage communicating with the inside of the wheel cutter; and injecting water into the wheel cutter through the water passage when the wheel cutter rotates. 2. The water according to claim 1, wherein a reflection plate is provided inside the wheel cutter to scatter water jetted from a water passage toward an inner peripheral surface of the wheel cutter. Injection type air sander.