JPH0759452B2 - Method for removing adhered powder in the transport pipe - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for peeling and removing a powder lump adhering to the inner surface of an inner pipe in an air transportation type equipped with an elastic inner pipe.

[0002]

2. Description of the Related Art As a transport pipe for transporting strongly adherent powder particles such as carbon black, for example, US Pat.
A double transportation pipe provided with a rubber elastic inner pipe such as 478 and 326 is adopted. This transport pipe forms a special projection on the outer surface of the elastic inner pipe, and in the transport state, that is, in the inner pipe pressurized state, air having a pressure higher than the transport pressure is intermittently supplied to the space of the inner and outer pipes to form the elastic inner pipe The aggregate is deformed and adhered to the wall of the inner tube to be peeled off and removed during transportation. The above-mentioned device requires a large number of valves and piping because it has to constitute a circulating system for the supply pressurized gas, and also has a drawback that the transport powder contaminates the circulating system when the inner pipe is damaged.

A transport pipe (actually developed 55-160331) for eliminating the circulation of the supply pressurized gas and releasing the supply gas to the atmosphere has been proposed, but the operating modes and operating conditions of the supply valve and the exhaust valve are completely different from those of the former. They are the same but have common drawbacks.

That is, since the inner pipe is subjected to the inner pressure due to the transport pressure during transportation, the pressurized gas supplied for deforming the inner pipe must have a higher pressure than this and requires extra energy. Besides, when the pressure is reduced, it expands due to the internal pressure. This expansion is large in the central part of the inner tube. Due to the repetition of such excessive deformation, the elasticity of the elastic inner tube is gradually deteriorated and the elastic inner tube is locally deformed as shown in FIG. 1 and is bent in the longitudinal direction as shown in FIG. As a result of this deformation, the effective transport pipe cross section becomes smaller, and the transport amount decreases even when no powder adheres. Further, stress is concentrated on the flange portion due to the adhered powder load, and the portion is easily damaged. Moreover, an essential drawback of both is that the exfoliated powder mass is transported together with the transport powder.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a pressurized gas supply condition for efficiently separating the supplied pressurized gas by using the supplied pressurized gas as a low pressure gas to save energy and not give a large deformation force to the inner tube. And a method of removing and collecting the separated powder lumps separately from the transport powder.

[0006]

According to the structure of the present invention, one operating valve is connected in parallel to the outer circumference of an outer pipe of a double transportation pipe in which flanges are provided at both ends and elastic inner pipes are concentrically arranged between the flanges. A plurality of pressure air supply ports and at least one exhaust valve provided between the flanges, the exhaust valve and the operating valve are closed to stop the transportation, and the transportation is stopped. To the atmospheric pressure and simultaneously open the exhaust valve and the operating valve to open and close only the operating valve at a predetermined time interval to remove the adhered powder, and then supply only the transportation air to the inner pipe. The exfoliated powder is pneumatically removed for the next transportation, and the vibrating area of the elastic inner tube is increased at a low pressure gas pressure to efficiently exfoliate the adhered powder, so that the inner tube is deformed. In addition to being undamaged, there is no transport air inside the inner tube after the peeling process. The blowing is peeled powder only because for pneumatically removing is performed advantages by the following transportation is always clean tube.

In the present invention, the elastic inner tube is an elastic tube made of rubber or the like, both surfaces of which are flat. The pressure air supply port may be provided in the longitudinal direction of the outer tube or on the circumference. Further, the pressurized air supplied to the void chambers of the inner and outer pipes is intermittently supplied at a predetermined time interval while the transportation system is stopped, the inner pipe is under atmospheric pressure, and the exhaust valve is opened. It Therefore, in the present invention, the pressurized gas is supplied when the void chamber is also at atmospheric pressure.

[0008]

EXAMPLE In FIG. 3, a transport pipe 1 is provided at a place where powder is likely to adhere. The outer pipe 2 is provided with connecting flanges 3 and 4 at both ends to support the flanges 5a and 5b of the elastic inner pipe 5. The above configuration is the same as the conventional technique. Reference numeral 6 denotes an exhaust valve composed of a solenoid valve, and reference numerals 7, 8 and 9 denote pressurized air supply ports provided in the longitudinal direction of the outer pipe, which communicate with the gap space 10 between the inner and outer pipes. Reference numeral 11 is a distribution header pipe, and 12 is a pressurized air supply pipe, which is connected to a storage tank 14 via an operation valve 13 such as a diaphragm. Reference numeral 15 is a pressure source. In the above device, the exhaust valve 6 and the operation valve 1 are in transit during transportation.
Both 3 are closed, and the gap space 10 is in a non-pressurized state. After the transportation of the batch is completed, the inside of the inner pipe is set to the atmospheric pressure, and the exhaust valve 6 and the operation valve 13 are simultaneously opened. A large amount of pressurized air is instantaneously blown into the interstitial space 10 and the inner pipe oscillates. Next, when the operation valve 13 is opened and closed at predetermined time intervals, the elastic inner tube 5 pulsatesly vibrates as shown in FIGS. After the peeling operation, the operation valve 13 and the exhaust valve 6 are closed to supply the transportation air to the inner pipe. The peeled powder containing the lump powder is blown to the discharge side by this transport air, and the inner pipe is cleaned. After this, the next transportation is started. The transportation according to the invention is always carried out after the inner pipe has been cleaned.

[0009]

In the present invention, the pressure of the pressurized gas may be lower than the pressure by the conventional method by at least the transport pressure, so that energy is saved. Also, in the peeling process in which pressurized air is supplied, the inside of the inner pipe is at atmospheric pressure and is in a state where it is apt to vibrate. Is obtained and the life of the inner tube is extended. Further, in the present invention, since the exhaust valve is closed during transportation, there is an advantage that even if the inner pipe is damaged during transportation, the transported powder does not fly into the outside air.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a deformed state of an inner pipe in a conventional method.

FIG. 2 Same as above, longitudinal cross-sectional view

FIG. 3 is a configuration diagram of main parts of an apparatus for implementing the present invention.

FIG. 4 is a sectional view showing a vibrating state of the inner pipe.

FIG. 5 Same as above, longitudinal sectional view

[Explanation of symbols]

 5 Elastic Inner Tube 10 Gap Space 6 Exhaust Valve 7 Pressurized Gas Supply Port 8 Pressurized Gas Supply Port 9 Pressurized Gas Supply Port 13 Operation Valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiko Murase 2-3-13 Kyobashi, Chuo-ku, Tokyo Toyo Inki Manufacturing Co., Ltd. (72) Fumio Yoshida 2-3-3 Kyobashi, Chuo-ku, Tokyo No. 13 in Toyo Inki Manufacturing Co., Ltd. (72) Inventor, Koji Fujiwara, 2-3-3 Kyobashi, Chuo-ku, Tokyo Toyo Inki Manufacturing Co., Ltd. (56) Reference JP-A-48-94179 (JP, A) Actual Development Sho 55-160331 (JP, U) Japanese Patent Sho 40-26070 (JP, B1)

Claims (1)

[Claims] 1. A transport pipe connected to a blow tank type pneumatic transport device, wherein one is provided on the outer circumference of a double transport pipe in which flanges are provided at both ends and elastic inner pipes are concentrically arranged between the flanges. In a transportation pipe having a plurality of pressure air supply ports connected in parallel to the operation valve and at least one exhaust valve provided between the flanges, the exhaust pipe and the operation valve are closed for transportation. After stopping the transportation to bring the inside of the elastic inner tube to the atmospheric pressure state and simultaneously opening the exhaust valve and the operation valve, only the operation valve is opened and closed at a predetermined time interval in this state to remove the adhered powder, and then the transportation air A method for removing and removing adhered powder, characterized in that only the supplied powder is supplied to the inner tube to remove the separated powder by air to carry out the next transportation.