JPH0532117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a cleaning device for flat screens used in the steel industry, mining, quarrying, etc. that handle powdery materials.

<Conventional technology> Conventionally, for example, in a steel mill, an inclined plane screen is used in the pre-process of a blast furnace to sieve fine grains and powdery raw materials in the feedstock to the blast furnace, and to pass them into the blast furnace at a certain level. Although we try to charge raw materials with a particle size or higher, fine grains or powdery raw materials in the raw materials may get stuck in the sieve holes on the screen surface as if they were driven into the sieve holes, or
Fine powder in the raw material adhered to the screen surface and grew, blocking the sieve holes and significantly reducing sieve efficiency. For this reason, such deposits were manually removed by washing with water after sieving, but since this was done manually, it took time and the frequency of work was limited, so it was not possible to remove the deposits sufficiently.

As a means to mechanize the cleaning and removal work of such deposits on the screen surface, a swinging nozzle as shown in Japanese Patent Application Laid-open No. 54-56240 for removing cleaning residue from the screen surface is placed on a trolley and the screen is removed. There have been proposed devices that move the top of the screen, and devices that move a plurality of swinging nozzles on a trolley as shown in Japanese Patent Laid-Open No. 142813/1983.

Furthermore, Japanese Utility Model Publication No. 43-24699 describes a device that is equipped with a nozzle group and sprays a separating agent such as water onto the top surface of the screen, and Japanese Utility Model Publication No. 59-25515 describes a device that has a nozzle group installed under the screen and blows compressed air. A device has been proposed.

<Problems to be Solved by the Invention> However, all of the above-mentioned devices have complicated and large-scale structures, resulting in huge equipment costs, frequent failures due to complicated auxiliary equipment, and poor maintainability. I had a problem with it getting worse.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art as described above, and to provide a flat screen cleaning device that is simple, compact, inexpensive to install, less prone to breakdowns, and easy to maintain.

<Means for Solving the Problems> The present invention provides a self-rotating nozzle that is provided facing a flat screen surface and performs three-dimensional rotation by combining rotations on two or more axes, and the self-rotating nozzle. A washing liquid conduit for supplying cleaning liquid to the cleaning liquid conduit, and a holding member for holding the autorotating nozzle or the cleaning liquid conduit, and a cover for preventing scattering of washing water is provided above the autorotating nozzle. .

<Function> The high temperature cleaning liquid supplied from the cleaning liquid conduit 3a is
When entering the autorotating nozzle 2, which rotates three-dimensionally by combining rotations over the axis, the autorotating nozzle 2 rotates due to the flow energy of the high-pressure cleaning liquid and the reaction force of the high-pressure cleaning liquid sprayed from the tip of the autorotating nozzle 2. 3
With the dimensional rotation, the cleaning liquid collides with the screen surface 1a while drawing a trajectory as shown in FIG. 2 with respect to the screen surface 1a, thereby cleaning the deposits on the screen surface 1a.

At this time, the high-pressure cleaning liquid ejected from above and from the left and right sides of the rotating nozzle 2 hits the cleaning liquid scattering prevention cover provided above the rotating nozzle 2 and flows downward, so the cleaning liquid does not scatter to the outside. Contributes to cleaning.

<Example> An example of the present invention will be described below based on FIG. 1. FIG. 1 is a schematic system diagram showing a first embodiment of the present invention. In Fig. 1, the water supply main 11a
When the water supply valve 10 of the more branched water supply pipe 11b opens, the wash water passes through the strainer 9 and is supplied to the water storage tank 7 and stored therein.

The stored cleaning water is pumped to about 130 liters by boost pump 6.
It is pressurized to Kg/ ^cm2 , passes through the water pipe 5a, the switching valve 4, the water pipe 5b, and is connected to the lower part of the water supply pipe 3a.It rotates three-dimensionally by combining the rotations of two or more axes. The liquid is discharged from the type nozzle 2 toward the screen surface 1a.

The water supply conduit 3a is held and fixed by a holding member 16 whose one end is fixed to a non-vibrating frame 23 around the screen. Note that the holding member 16 is omitted,
The water supply pipe 3a may be held and fixed by the water supply pipe 5b. Further, 17 is a frame erected around the four sides of the screen surface 1a, and 13 is a dust prevention cover provided on the upper part of the frame 17.

The water storage tank 7 is provided to stably supply cleaning water to the boost pump 6, and the level gauges 8a, 8
b and 8c are attached. Level meter 8a, 8
b and 8c output signals to the boost pump 6 and the water supply valve 10, and when the level meter 8a operates, the water supply valve 10 closes, and when the level meter 8b operates, the water supply valve 1 closes.
0 is opened, and the boost pump 6 is stopped by the operation of the level meter 8c. The strainer 9 removes foreign matter contained in the washing water and prevents the waterway of the rotating nozzle 2 from clogging. The switching valve 4 is provided to select the screen 1 to be cleaned and can be used selectively, so the boost pump 6 only needs to have a capacity for cleaning one screen.

The rotating nozzle 2 that rotates three-dimensionally may be a known commercially available nozzle, but any type may be used as long as it can provide the same cleaning locus as a known commercially available rotating nozzle.

When the high-pressure water supplied from the water supply pipe 3a enters the rotating nozzle 2, the flowing energy of the high-pressure water and the reaction force of the high-pressure water jetting from the tip of the rotating nozzle 2 cause the rotating nozzle 2 to The cleaning water rotates dimensionally and spouts high-pressure water around the screen, and within a certain period of time, the cleaning water collides with the screen surface 1a while drawing a trajectory as shown by the continuous curve from point A to point B in Figure 2, and the screen Clean the deposits on the surface 1a. If the rotation range of the autorotating nozzle 2, the dimensions of the screen surface 1a, and the distance from the screen surface 1a to the autorotating nozzle 2 are appropriately selected, the autorotating nozzle 2 can be
The jet stream from the screen can completely impinge on the screen surface 1a and clean it. The water supply pressure to the rotating nozzle 2 (discharge pressure of the pump 6) and the mounting position of the rotating nozzle 2 (plane position facing the screen surface 1a and distance from the screen surface 1a),
If the number of rotary nozzles 2 to be installed is selected appropriately, that is, if it is selected to have a sufficient cleaning effect on the farthest corners of the screen surface 1a than the rotary nozzles 2, the entire surface of the screen surface 1a can be effectively cleaned. can. In addition, splashing of the washing water outside the screen surface 1a is almost prevented as it is blocked by the inner wall surface of the frame 17 that stands upright around the four sides of the screen surface 1a and the inner wall surface of the dust prevention cover 13 provided above the frame 17. be done.

Furthermore, according to this cleaning device, the water supply pressure is 130Kg/cm ²
By cleaning for about 10 minutes, you can thoroughly clean an area within a 1.5m radius without any cleaning residue.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a partially sectional side view of the second embodiment.

In the embodiment shown in FIG. 1, the upper end of the water supply conduit 3a to the three-dimensionally rotating autorotating nozzle 2 is directly connected and fixed to the tip of the water supply pipe 5b, but in this embodiment, the water supply conduit 3a and the water supply pipe 5b are Hose 3b between
interposed between the rotating nozzle 2 and the screen surface 1.
A part of the water supply pipe 3a is clamped by a water pipe clamp device 18 so as to be slidable up and down. The clamp device 18 is fixed to one end of a slide arm 19 extending in the horizontal direction, and a part of the other end of the slide arm 19 is inserted into a slide arm holding pipe 21 and held in an appropriate position with a slide arm fixing fitting 20. It is becoming fixed. The other end of the slide arm holding pipe 21 is connected to the screen 1
A post 22 erected on a non-vibration frame 23 around the
is fixed. Note that the post 22 may have a structure that can be rotated and fixed.

With this configuration, the three-dimensional position of the autorotating nozzle 2, that is, the distance from the screen surface 1a and the position in a plane parallel to the screen surface 1a, can be adjusted, which was not possible in the first embodiment. The optimum nozzle position can be set at a position where the screen surface 1a can be sufficiently and efficiently cleaned in a short time by adjusting it appropriately according to the size of the screen and the type of raw material to be sieved.

Furthermore, the embodiment shown in FIG. 3 is designed to rotate on its own axis in order to increase the cleaning effect by causing the cleaning liquid (water) that would otherwise be wasted by scattering or colliding with the surroundings of the screen surface 1a to flow down within the range of the screen surface 1a. An anti-scattering cover 14 is provided on the top of the nozzle 2, and the anti-scattering cover 14 consists of a side wall and a ceiling depending on the shape of the screen surface 1a (square, rectangle, or circle). Part of the jet flow from the rotating nozzle 2 is blocked so that the outermost periphery of the jet flow from the nozzle 2 (broken line in FIG. 3) collides with the outside of the outer periphery of the screen surface 1a (that is, the lower part of the frame 17). You can install it in such a position. With this configuration, the cleaning liquid (water) spouted upward and to the left and right from the rotating nozzle 2 hits the side wall of the anti-scattering cover 14 and the inner wall of the ceiling and flows downward, so that high-pressure water of about 130 kg/cm ² is released. is the screen surface 1a and the dust prevention cover 14
Since the water flowing down to the lower part contributes to cleaning the screen surface 1a to some extent without being scattered to the surroundings from between the screens, the cleaning time can be shortened.

In addition, if the screen surface of one screen is wide, a plurality of autorotating nozzles may be provided.

<Effects of the Invention> Since the present invention is configured as described above, it is possible to realize a simple, compact, and inexpensive cleaning device for flat screens, and even when multiple screens are cleaned in a short time, there is no cleaning residue and reliably requires manual labor. It can be washed without spraying. In addition, raw materials stuck to the sieve mesh that cannot be removed manually can be removed using high-pressure liquid of about 130 kg/cm ² . In addition, the device is simple, has few failures, and is easy to maintain.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the present invention together with a piping system diagram, Fig. 2 is an explanatory diagram showing an example of the collision trajectory of washing water on the screen surface, and Fig. 3 is a side view showing an embodiment of the present invention together with a piping system diagram. FIG. 2 is a partially cross-sectional side view showing an example. 1...Screen, 1a...Screen surface, 2
...Rotating nozzle, 3a...Cleaning liquid conduit, 14...
...Scatter prevention cover, 16...Holding member.

Claims (1)

[Claims] 1. Provided opposite to the flat screen surface,
A planar type consisting of an autorotating nozzle that rotates three-dimensionally by combining rotations on two or more axes, a cleaning liquid conduit that supplies cleaning liquid to the autorotating nozzle, and a holding member that holds the autorotating nozzle or the cleaning liquid conduit. Screen cleaning equipment. 2. The flat screen cleaning device according to claim 1, wherein the holding member is capable of adjusting the distance between the screen surface and the autorotating nozzle. 3. Provided opposite the flat screen surface,
A self-rotating nozzle that rotates three-dimensionally by combining rotations of two or more axes, a cleaning fluid conduit that supplies cleaning fluid to the self-rotating nozzle, a holding member that holds the automatic nozzle or the cleaning fluid conduit, and the self-rotating nozzle. A flat screen cleaning device consisting of a cover installed above to prevent splashing of cleaning water. 4. The flat screen cleaning device according to claim 3, wherein the holding member is capable of adjusting the distance between the screen surface and the autorotating nozzle.