JPS60167767A - Weld line blast machine - Google Patents

Abstract

PURPOSE:To heighten projection density as well as to shorten the time required for grinding work in a way of increasing the forward speed of a blast machine, by making an injection nozzle go forward obliquely for a line being orthogonal with a cross direction, while reducing the projection width of a blast projecting member. CONSTITUTION:As a result, that each wheel 11 of a body of a blast machine 10 is directed toward a direction along a line 13 oblique to a line 12 being orthogonal with sideward size l1 of an injection nozzle 5, the machine 10 is made to go forward in the form of being adjusted to a weld line part on a tank bottom plate, and projection width l2 of a blast projecting member is remarkably reduced to the sideward size l1 of the injection nozzle 5 whereby blast projecting density is raised. In addition, a horizontal plate 15 is installed in position between the front of a brush 14 around the injection nozzle 5 and the front of the injection nozzle 5 and thereby an air velocity of air flowing into a recovery hood 7 from the front of the brush 14 is increased, thus working time is shortened and, what is more, attraction of the blast projecting member is made so easy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weld line blast machine, and more particularly to a blast machine used for cleaning a weld line portion of a tank bottom plate.

Weld lines on tank bottom plates are required to be periodically inspected for corrosion and pitting by the naked eye, infrared rays, ultrasonic waves, vacuum, or magnetic detectors. In addition, because the bottom plate of the tank is coated with paint or has cracks, it is necessary to clean the weld line area, which requires periodic inspection, before the inspection. be. The present invention is utilized in such fields [Prior art and its problems] Welding lines. As shown in FIGS. 1-2, a conventional blast machine used for the substrate abrasion process injects shot material in a hopper 1 into a projection path 4 by a rotor 3 rotated by an electric motor 2. The shot material is ejected from the injection port 5 onto the tank bottom plate 6, and then returned to the hopper 1 through the recovery hood 7.

The injection port 5 has a horizontally long rectangular shape, and generally has dimensions of 600 x 100 wOIl. Furthermore, the wheels 8 of the plastic machine are arranged in a direction perpendicular to the lateral direction of the injection port 5. Therefore, the weld line portion is polished in a manner perpendicular to the lateral direction of the injection port 5. As mentioned above, since the lateral dimension of the injection port 5 is 600 tm+, a grinding surface of approximately 300 w+m is created on the left and right sides of the weld line. However, such a wide polishing surface is not necessarily required for periodic inspection of the weld line, and it is sufficient to have a polishing surface with a width of 100 to 150 m++ on both sides of the weld line. Therefore, the width of the injection port 5 in the horizontal direction is 300wn.
However, if the width of the injection port 5 in the lateral direction is shortened, the shot material will hit the wall of the projection passage 4 and be scraped off, which will significantly shorten the life of the injection passage 4. let Therefore, it is not practical. moreover,
Although it is possible to modify the rotor 3 to be suitable for the width 300++a, this is not preferable because it increases the cost.

[Technical problem of the present invention and its means]

The technical problem of the present invention is to solve the above-mentioned problems of the prior art, and basically, the present invention is a technology that orients the wheels in a diagonal direction with respect to a line perpendicular to the horizontal direction of the injection port of the shot material. use practical means.

[Operations and effects of the present invention]

In the present invention, since the injection nozzle moves forward obliquely to a line perpendicular to its lateral direction, the projection width of the shot material is shortened with respect to the actual width of the injection nozzle. This increases the projection density, so in order to maintain the same projection == as before, the advancing speed of the plastic machine can be increased. In this way, the cleaning work can be significantly shortened. Furthermore, by orienting the wheels to the gland perpendicular to the lateral direction of the injection port,
It is possible to clean the floor of a wide tank bottom plate.

[Embodiments of the present invention]

A brush is installed around the nozzle to prevent the shot material from scattering.
A substantially horizontal grate is arranged between the brush and the front of the injection port. This pump V-1j facilitates suction of the shot material without accumulating the shot material in front of the injection port. In this way, the shot material can be recovered efficiently.

Figures 3-4 show examples of actual boats of the present invention. Note that the explanation of the same components as those of the conventional example will be omitted, and H>x−
The reference numbers used in Figure 2 are attached to Figures 3-4 for reference.

The wheels 11 of the main body of the plastic machine 100 are aligned with a line 13 that is diagonal to a line 12 that is perpendicular to the lateral direction 11 of the injection port 5.
Orient it along the direction.

As a result, when the blast machine 710 is moved forward with the weld line of the tank bottom plate aligned with the line 13, the width of the blasting material! 2 can significantly shorten the lateral dimension of the injection port 5 and increase the firing density. Therefore, in order to obtain the same shot density as in the past, the advancing speed of the plast machine 10 must be increased. This will lead to a reduction in work time and increase work efficiency.

A nylon brush 14 is arranged around the injection port 5. A substantially horizontal plate 15 is attached between the front surface of this brush 14 and the front surface of the injection port 5.

This plate 15 increases the wind speed of the air flowing from the front surface of the brush 14 to the recovery hood 7, and facilitates suction of the shot material. Therefore, even if the blast machine 10 is moved in the direction of the line 13, the shot material does not accumulate in front of the injection port 5.

[Brief explanation of drawings]

Figure 1 is a plan view of a conventional plast machine, and Figure 2 is a top view of a conventional plastic machine.
3 is a plan view showing an example of the present invention, and FIG. 4 is a sectional view showing the injection port portion. In the diagram: 3...Rotor, 5...Injection port, 11...Wheel, 13...Working line direction, 14...Brush, 15...
··plate. Agent Patent Attorney Hideaki Kuwahara

Claims (1)

[Claims] In a blasting machine that injects blasting material with a rotor and then recovers the blasting material, the blasting material outlet of the blasting machine has a horizontally long rectangular shape, and a line perpendicular to the horizontal direction A welding line plast machine that is characterized by its wheels facing diagonally.