JPS5848452B2 - dustproof hopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a technique for suppressing the scattering of dust thrown up when bulk materials are discharged into a hopper.

When handling bulk materials, such as phosphate rock and alumina, in other words, granular materials, if these materials are unloaded from a grab packet or the like into a hopper, dust will fly up and scatter, worsening the environment.

Therefore, it is necessary to provide the hopper with anti-scattering equipment.

Conventional methods for preventing dust generation include water sprinkling methods and methods in which removed air is sucked in with a blower and then treated with a dust collector.

However, the conventional dust generation prevention method described above has the following drawbacks.

That is, when using the water sprinkling method, it is necessary to devise a water supply device for a moving hopper, or it cannot be applied to materials that dislike moisture, such as phosphate rock or alumina.

Next, in the case of a method using a dust collector, there are considerable restrictions in terms of equipment costs and installation area.

In particular, the drawback common to both of the above-mentioned methods is that they require power to prevent dust generation.

Conventionally, the first dust generation prevention method that does not require power is
As shown in the figure, there is one in which a baffle plate 3 is provided on the upper part of the hopper side wall 1a and the hopper bottom wall 2 to form an air chamber 4.

In such a configuration, when the granular material A is discharged into the hopper by the grab packet, an air flow B containing dust generated by the granular material A colliding with the hopper side wall 1 is received in the air chamber 4. This is where the dust settles and dust generation is suppressed.

However, since the air flow flowing into the air chamber 4 is fast, the pressure inside the air chamber 4 increases instantaneously, and there is a drawback that an abnormal noise may be generated depending on the case.

Furthermore, when the powder and granules are continuously dropped into the hopper, the air containing unsettled dust in the air chamber 4, which has the same constitution as the discharged powder and granules, is replaced and flows back to the outside of the air chamber 4. This results in a drawback that the effect of suppressing dust generation is deteriorated.

An object of the present invention is to provide a dust-proof hopper that can improve the dust generation suppressing effect without using power.

An embodiment of the present invention will be described below based on FIG. 2.

Components that are the same as those in FIG. 1 are designated by the same reference numerals as in FIG.

The hopper shown in FIG. 2 is a modification of the hopper shown in FIG. 1 to which the present invention is applied, and specifically, the following structure is newly added.

That is, the hopper side wall 1a has a ventilation u communicating with the inside of the air chamber 4.
5 is opened, and the opening of a bag 6 is attached to this vent 5.

Therefore, the inside of the air chamber 4 and the inside of the bag 6 are communicated through the vent 5.

This bag 6 is made of fabric cut into a bag shape and has breathability, and the volume of the bag 6 can be changed by expanding or contracting the bag 61'l body.

According to the hopper constructed in this manner, the air flow H containing dust generated by charging the powder material A into the hopper flows from the air chamber 4 into the bag 6, and this bag 6 is indicated by a solid line. From the shrunken state, it will be inflated as shown by the two-dot chain line.

In this way, the pressure inside the air chamber 4 decreases by the amount equivalent to the volume increased by the expansion of the bag 6, so that dust does not fly outside the air chamber 4 and no abnormal noise is generated.

Furthermore, pressure fluctuations within the air chamber 4 are also reduced, which weakens the air flow and accelerates the settling of dust.

Although the bag 6 does not need to be breathable, if a breathable bag 6 is used as in the embodiment, the bag 6 performs the above-mentioned filter function and drains the high-pressure air in the air chamber. Since only the dust is taken out of the hopper, it is possible to accelerate the settling of the dust and prevent the dust from scattering.

As described above, according to the present invention, the substantial volume of the air chamber is increased by utilizing the I1 nica of the airflow generated during cargo handling, and the king force and its fluctuations are reduced to prevent the backflow of dust and to reduce the dust flow. It is possible to provide a dust-proof hopper that can improve the dust suppression effect without using power because it can also prevent settling.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a longitudinal section of a conventional hopper receiving powder and granules, and Fig. 2 is a diagram showing a longitudinal section of a hopper according to the present invention receiving powder and granules. It is a diagram. 1,1a...Hotsuba 1 cut wall, 2...Bottom wall, 3...Shiyahei board, 4...
・Air chamber, 5...Vent, 6...Bag,
A... Powder, I3... Soil updraft.

Claims (1)

[Scope of Claims] 1. An air chamber is provided in the hopper to catch the upward airflow generated when bulk materials are discharged into the hopper, and a flexible bag is provided in the hopper and is freely communicated with the air chamber. Dust-proof hopper that can be installed. 2. The dustproof hopper according to claim 1, wherein the flexible bag is made of a breathable material.