JPS5842560Y2 - Pneumatic transport device for excavated soil - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a pneumatic transportation device for excavated soil.

The pneumatic transportation device is equipped with a separator that separates the transportation air from the transported material (in this case, the excavation) at the downstream end of the blast pipe.
A cyclone or bag filter is connected and this separator prevents dust from being dispersed into the atmosphere.

However, if excavated soil with high specific gravity is to be transported by air, operation with high wind speed and large air volume is required, and as a result, a separator with a large capacity, that is, a large one must be used.

Therefore, when a separator suitable for pneumatic transportation of excavated soil is manufactured, it has the disadvantage that it is too large and difficult to put into practical use due to cost and installation space considerations.

Therefore, the present invention was developed to solve the above-mentioned drawbacks.In order to prevent dust scattering during pneumatic transportation of excavated soil, it is possible to prevent dust scattering by not only using a separator but also by injecting water into the transportation air to increase the separation efficiency of the separator. We have manufactured a pneumatic transportation device for excavated soil that does not cause the risk of dust scattering even with a small separator.

Another purpose of the present invention is that in pneumatic transport of excavated soil, if the moisture content of the excavated soil is high, it will cause viscosity.
Since there is a risk of a wind pipe clogging accident, we have manufactured an excavation pneumatic conveyance device that only injects water when necessary and does not lead to a wind pipe clogging accident.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

In the figure, reference numeral 1 designates an air blowing pipe, to one end of which a blower 2 for supplying transportation air is connected, and to the other end a separator 4 for separating transportation air from the excavation surface.

A feeder 3 for feeding excavated soil into the air pipe 1 is connected to a suitable place in the middle of the air pipe 1, and the excavated soil thrown into the air pipe 1 from the feeder 3 is transferred to the proa 2. It is the same as in the conventional pneumatic transport device that the transport air is transported to the separator 4 along with the flow of transport air, and is separated into transport air and excavated soil by the separator 4.

In the illustrated example, the separator 4 is a cyclone, but a conventionally known separator such as a thermal bag filter may also be used.

A dust detection device 7 is arranged at the exhaust port 4a of the separator 4.

The illustrated dust detection device 7 has a light source 7a and a phototransistor b facing each other, and electrically detects the amount of dust in exhaust gas passing between them as a change in the amount of light incident on a phototransistor 7b.

Further, a water injection pipe 5 for injecting water into the air pipe 1 is connected to a portion upstream of the feeder 3 of the air pipe 1 .

Although the connecting part between the water injection pipe 5 and the air blower pipe 1 is not necessarily clearly shown in the figure, it is possible to connect the water injection pipe 5 so that the end of the water injection pipe 5 opens to the peripheral wall of the air blower pipe 1. Alternatively, the end of the water injection pipe 5 may penetrate into the air pipe 1 and be housed in the air pipe 1 in the form of a nozzle to be connected. Desirably, water injection from the water injection pipe 5 may be It is preferable to spray it evenly into the transportation air.

Furthermore, the water injection pipe 5 is provided with a pipe opening/closing valve 6 such as a solenoid valve whose opening/closing is controlled based on the dust detection value of the dust detection device 7.
will be established.

This pipeline opening/closing control can be carried out by simply operating the pipeline opening/closing valve 6 after the dust detection device 7 detects dust and processing the detection signal in the control panel 8. is closed and water injection is stopped, but when dust is detected, the pipe opening/closing valve 6 is opened and water injection is performed until dust is no longer detected.

It should be noted that this pipe opening/closing valve 6 can be configured not only to open and close the water injection pipe 5 but also to adjust the amount of water injection in response to the amount of dust, which is easy with conventional technology and is desirable when implementing the present invention. It is.

The present invention has the above-mentioned structure and allows water to be injected into the transportation air from the water injection pipe 5. Therefore, when the excavated soil is dry and there is a risk of dust scattering from the exhaust port 4a, the transportation air can be injected into the transportation air. A pneumatic conveyance device for excavation in which the separation efficiency of the separator 4 is improved by injecting water into the excavated soil so that it does not contain water during pneumatic conveyance, thereby preventing the scattering of dust even when a small separator 4 is used. It is possible to provide

In addition, when excavated soil has a high moisture content, it generally becomes viscous,
No attempt was made to inject water into the wind pipe due to the risk of causing a blockage accident; however, it was confirmed that there is no risk of a blockage accident in the case of high wind speed pneumatic transportation with a small amount of water content. According to this plan, water is injected only when necessary, and water injection is stopped when the excavated soil itself has a high moisture content and no dust is generated, thereby eliminating the risk of air pipe blockage.

In addition, in this case, water is injected upstream from feeder 3, so the injected water is made uniform by the flow of transportation air, and then comes into contact with the excavated soil, reducing the viscosity with minimal water injection. It can efficiently prevent dust without increasing the amount of water, and can also prevent the water inlet from clogging with excavated soil.

[Brief explanation of the drawing]

The drawing is a partially sectional front view showing an embodiment of the excavated soil pneumatic transportation device according to the present invention. 1-Air pipe, 2-Blower, 3-Feeder, 4-Separator,
4a - exhaust port, 5 - water injection pipe, 6 - pipe opening/closing valve, 7 - dust detection device.

Claims (1)

[Claims for Utility Model Registration] A blower pipe 1 with a blower 2 for supplying transportation air at one end and a separator 4 for separating the transportation air from the excavation surface at the other end.
In the pneumatic transportation device for excavated soil, which is formed by connecting a feeder 3 for feeding the excavated soil into the air pipe 1 at a suitable place on the way, a dust detection device 7 is disposed at the exhaust port 4a of the separator 4, And, in the upstream part of the air pipe 1 from the feeder 3,
A water injection pipe 5 for injecting water into the air pipe 1 is connected to the excavated soil, and the water injection pipe 5 is further provided with a pipe opening/closing valve 6 whose opening and closing are controlled by the dust detection value of the dust detection device 7. pneumatic transport equipment.