JPH11216655A - Water injection grinder - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent dust from rising reliably and effectively, to maintain good lubricity between the wheel force cutter and the coating surface, etc., and to perform maintenance and inspection of the dust collection mechanism. Provided is a water-jet grinder that can efficiently perform a cutting operation without troublesome work. An electric motor (4) and a wheel cutter (9) driven and rotated by the electric motor (4) are provided on a grinder body (1), and a water jacket (22) is provided on the outer periphery of the electric motor (4).
A water passage is provided from the water jacket 22 to the inside of the wheel cutter 9 via a water supply pump when the wheel cutter 9 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 grinder used for embedding the surface of an outer wall of a building, for example, when repairing a building.

[0002]

2. Description of the Related Art A grinder is used for cutting off a coating film on an outer wall of a building. In this type of conventional grinder, a cup-shaped wheel cutter is rotated using a drive source, 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 periphery of one side of the wheel cutter is covered with a cover, a suction hose derived from a dust collecting mechanism separate from a grinder is connected to the cover, and dust accompanying cutting of the coating film is passed through the suction hose from inside the cover. Means for suction 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 rise, which causes a reduction in the life of the wheel cutter.

Further, the use of the dust collecting mechanism causes a problem such as clogging inside the dust collecting mechanism, so that the dust collecting mechanism must be periodically cleaned, and a troublesome work for maintenance and inspection is required.

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 grinder which can maintain the lubrication of the satisfactorily, does not require the troublesome work of maintenance and inspection of the dust collecting mechanism, and can efficiently carry out the cutting work.

[0007]

In order to achieve the object, the present invention provides an electric motor and a wheel cutter driven by the electric motor on a grinder main body, and an outer periphery of the electric motor is provided on the grinder body. A water flow section is provided, a water flow path is provided from the water flow section to the inside of the wheel cutter, and water is injected from the water flow section through the water flow path to the inside of the wheel cutter through the water supply means when the wheel cutter rotates. It was made.

It is preferable that a scattering means for scattering water jetted through the water passage toward the inner peripheral surface of the wheel cutter is provided inside the wheel carter. This scattering means can be configured by providing a reflection plate facing the opening of the water passage.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a water-injection grinder according to the embodiment, and FIG. 2 is a plan view thereof. 1 shows a grinder body, which is composed of a housing 2 and a bracket 3 attached to the housing 2.
It is composed of

An electric motor 4 is mounted on the housing 2, and a rotating shaft 5 is provided on the bracket 3 so as to penetrate the bracket 3 in a vertical direction. The rotating shaft 5 is rotatably supported via bearings 6 and 7. Have been. A gear 8 is attached in the middle of the rotating shaft 5, and a lower end of the rotating shaft 5 projects from the bracket 3, and a flat cup-shaped wheel cutter 9 is detachably attached to the projected portion via a nut 10. Installed.

A cap 11 is mounted on the upper surface of the bracket 3, and the upper end of the rotating shaft 5 protrudes into the cap 11, and the protrusion is rotatably supported via a bearing 12. A through hole 13 for water passage is formed in the central shaft portion of the rotating shaft 5, and a water passage 14 communicating with the through hole 13 is formed in the cap 11.

The output shaft 15 of the electric motor 4 is
, A gear 16 is attached to this projection, and the output shaft 15 of the electric motor 4 is attached to the bracket 3.
The support shaft 17 is located between the rotating shaft 5 and
The idle gear 20 is attached to the support shaft 17 so as to be freely rotatable through the support shaft 19. The idle gear 20 meshes with a gear 16 provided on the output shaft 15 of the electric motor 4 and a gear 8 provided on the rotary shaft 5, respectively. The wheel cutter 9 is adapted to rotate along with the shaft 5.

Reference numeral 21 denotes a coil cover of the electric motor 4.
The coil cover 21 extends rearward from the housing 2, and a cylindrical water jacket 22 that forms a flowing water portion is attached to the outer periphery of the coil cover 21. The water jacket 22 also serves as a handle for handling the grinder, and the internal space of the peripheral wall serves as a water storage section 23 for storing and circulating water.

A water jacket 22 is provided between one end of the water jacket 22 and the cap 11.
A water pipe 24 that connects the water reservoir 23 in the inside and the water passage 14 in the cap 11 is attached. The water reservoir 23, the water pipe 24, the water passage 14, and the through hole 13 of the rotating shaft 5 constitute a series of water passage through which water flows.

At the other end of the water jacket 22, a water cock 25 communicating with the water storage portion 23 is attached, and the water cock 25 is led out from a water supply pump (not shown) as water supply means. A water supply hose 26 is connected. The water cock 25 has a rotatable handle 27. By operating the handle 27, the start and stop of water supply and the adjustment of the amount of water supply can be performed.

A power cord 28 extends from the rear end face of the coil cover 21 of the electric motor 4, and a switch 29 for turning the electric motor 4 on and off is provided on the rear end face. When using the water-injection grinder configured as described above, first, the switch 29 is turned on and the electric motor 4 is turned on.
And the electric motor 4 drives the rotating shaft 5 to rotate the wheel cutter 9.
Is pressed against, for example, a coating surface of an outer wall of a building, and the coating is cut.

At this time, the water cock 25 is opened, and the water pumped from the water supply pump is fed through the water storage portion 23 of the water jacket 22, the water pipe 24, the water passage 14, and the through hole 13 of the rotary shaft 5 to rotate the wheel cutter 9. To be injected sequentially inside.

The jetted water impinges on the surface of the coating film being cut and diffuses, so that moisture is impregnated into the dust of the coating film during the cutting, so that the dust does not soar up and is quickly calmed down. And the coating surface to be cut by the wheel cutter 9 becomes wet,
Therefore, good lubricity between the wheel cutter 9 and the coating surface is maintained, whereby the wheel cutter 9 rotates smoothly, and the cutting operation can be efficiently performed.

Since dust can be prevented from rising by spraying water, a dust collecting mechanism by suction as in the prior art is not required, and the troublesome work of maintenance and inspection of the dust collecting mechanism can be omitted, and the cutting work can be performed more efficiently. Can proceed.

Further, the water injected into the wheel cutter 9 cools the wheel cutter 9, and this cooling suppresses an excessive rise in temperature of the wheel cutter 9, thereby preventing its life from being shortened.

On the other hand, during use of the grinder, the temperature of the electric motor 4, especially the coil cover 21, rises, and if a large load is applied to the wheel cutter 9, the wheel cutter 9 may be overheated. However, a water jacket 22 is provided on the outer periphery of the coil cover portion 21 of the electric motor 4, and water is supplied from a water supply pump to a water storage portion 23 in the water jacket 22 to flow therethrough. The electric motor 4 is constantly cooled by water, so that overheating of the electric motor 4 is reliably suppressed, and burning of the electric motor 4 due to the overripening is prevented.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, a wheel cutter 9 is provided.
A reflection plate 30 having a curved surface is provided as a scattering means for scattering water. The reflecting plate 30 is attached to the wheel cutter 9 via a plurality of stays 31 so as to face the opening 13 a at the lower end of the through hole 13 formed in the rotating shaft 5.

In the grinder according to the second embodiment, water sprayed from the through hole 13 of the rotating shaft 5 hits the reflecting plate 30 and scatters on the inner peripheral surface of the wheel cutter 9.
Further, the rotation of the wheel cutter 9 forms mist-like water droplets and diffuses throughout the wheel cutter 9.

Therefore, moisture is evenly and sufficiently contained in the dust of the coating film due to the cutting by the wheel cutter 9, so that the soaring of the dust can be further effectively suppressed.

The scattering means for scattering water includes:
As shown in FIG. 4 as a third embodiment, the lower end of the rotating shaft 5 is projected inside the wheel cutter 9 without using a reflector, and the lower end of the through hole 13 of the rotating shaft 5 is closed. A case in which one or a plurality of lateral injection holes 32 are formed on the peripheral surface of the rotating shaft 5 at the protruding portion, and water is injected from the injection holes 32 toward the inner peripheral surface of the wheel cutter 9. It may be.

Further, the water jet type dainder according to the present invention is not limited to the case where the paint film is cut and removed, but 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. Can be similarly used.

[0027]

As described above, according to the present invention,
The rising of dust can be reliably and effectively suppressed by spraying water, so that a good working environment can be maintained, and good lubricity between the wheel cutter and the coating surface can be obtained. The motor can be smoothly rotated to improve workability, and the electric motor can be cooled using water for injection to prevent overheating.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the grinder.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Grinder main body 4 ... Electric motor 5 ... Rotating shaft 8 ... Gear 9 ... Wheel cutter 13 ... Through-hole 14 ... Water passage 15 ... Output shaft 16 ... Gear 17 ... Support shaft 20 ... Idle gear 22 ... Water jacket 24 ... Water pipe 25 water tap 26 water supply hose 30 reflector 32 injection hole

Claims (3)

[Claims] An electric motor and a wheel cutter driven and rotated by the electric motor are provided on a grinder main body, and a running water portion is provided on an outer periphery of the electric motor, and a flow passage from the running water portion to the inside of the wheel cutter is provided. A water-jet grinder, wherein a water path is provided, and when the wheel cutter rotates, water is jetted from the water flowing section to the inside of the wheel cutter through a water-flow path via a water supply means. 2. The wheel cutter according to claim 1, wherein a scattering means for scattering water jetted through the water passage toward the inner peripheral surface of the wheel cutter is provided inside the wheel cutter. Water injection grinder. 3. The water jet grinder according to claim 2, wherein the scattering means is constituted by a reflection plate disposed opposite to the opening of the water passage.