JPH01214519A - Pneumatic carrying method for bulk material - Google Patents

Abstract

PURPOSE:To simplify the structure, to improve general usage and to prevent fault by sucking bulk material from a yard and accumulating the bulk material in a covered hopper, thereafter falling the bulk material into a pressure tank and feeding pressure air into the pressure tank in order to take out the bulk material from the tank, and repeating the cycle. CONSTITUTION:Air is sucked from a hopper 1 through a pneumatic pump 3 and a suction pipe 4 in order to accumulate bulk material through the suction pipe 4b into the hopper 1. When the bulk material in the hopper 1 reaches to a predetermined height, an upper limit level gauge 9 functions to open the bottom valve 8 of the hopper 1 thus sucking the outer air through a three-way valve 11 and falling the powder material down into a pressure tank 2. When the bulk material falls down entirely, the valve 8 closes. Consequently, suction of the bulk material is resumed and a discharge three-way valve 12 functions to lead the discharge gas into the pressure tank 2 and carry the bulk material from the pressure tank 2 through a carrying pipe 6. By such arrangement, the bulk material can be carried through simple structure with no fault and general usage can be improved.

Description

[Detailed description of the invention] (Objective) This invention integrates suction and pressure feeding of powder and granules into one
This invention relates to a method for air conveying powder and granules that can be carried out continuously using a single air pump.

Transporting substances by suction and pressure using air pipes is itself an excellent means of transport, but if the substance is in the form of powder or granules, depending on the type of material, the temperature and humidity of the atmosphere may vary.
Because it is easily affected, special consideration is required both mechanically and in handling, and this has hindered the advancement of air conveyance of powder and granular materials. An object of the present invention is to eliminate the disadvantages of the conventional system and create a general-purpose system 11 that is simple and has fewer failures.

(Structure and operation) Next, the system of the present invention will be explained based on drawings (flow sheets).
d, 4b) and exhaust pipe (5a.

5b), the conveyor pipe ((3), the filter (7), and the on-off valve (8)
), the 1st limit level meter (9), the lower limit level meter (jO), the suction side three-way j'i (11), and the wandering side three-way valve (12).
dan. To explain the operation of the above-mentioned score element in the order of steps, 1) Suction and exhaust occur simultaneously when the air pump (3) is activated, but first the powder is sucked from the storage area through the suction pipe (4a) and sent to the hopper (1). Go inside.

A whirlwind phenomenon occurs in the hopper, and the powder and granules are separated from a considerable amount of air containing air and deposited in the hopper, and the separated air is filtered by a filter (7) attached to a part of the hopper. It goes to the air pump (3) through the suction tube (4b) connected to the hopper lid.

2) When the powder in the hopper reaches a certain height, the upper limit level is reached! 1 (9) The hopper bottom opening/closing valve (
8) is opened and the powder and granules are connected to the lower part of the hopper in the pressurized tank (
2) Let it fall inside and close it when it finishes falling.

3) While step 2) is in progress, the suction is switched to outside air suction by the operation of the three-way valve (11) on the suction side, and suction of powder and granules is interrupted, but when the on-off valve (8) closes, suction of powder and granules resumes. is restarted, the filtered air sucked into the air pump (3) becomes exhausted, passes through the n+ trachea (5, 1) through the operation of the exhaust side three-way valve (12), and is pressurized to 13 parts of 4+11y (2). It is then introduced into the tank.

4) The air placed in the pressurized tank presses the powder and granules accumulated in the tank and is sent to the outside through the conveyor pipe (6) connected to the upper part of the tank. 411” that connects
- It is press-fitted into the conveying pipe through the C pipe (5b) and urges the powder and granular material to be propelled.

5) When the amount of powder and granules in the pressurized tank decreases and the remaining amount exceeds the limit, the lower limit level 11 (10) detects this and stops the conveyance, and opens the on-off valve (8) to remove the powder and granules in the hopper. Place the receiver in a pressurized tank. Powder 11° due to the combination of r+jj elements
Suction inside one hopper, transfer from hopper to pressurized tank, pressurization h [#! Pressure feeding from the hopper to the outside continues until the switch is turned off.6 (Effects) 1) By sucking the powder into the hopper, a whirlwind phenomenon occurs and the contained air arrows are separated to some extent. The purity of the powder and granules is increased, and the effects of temperature and humidity are reduced, making transportation easier.

2) It is economical because suction and pressure feeding of powder and granular materials are performed with one air pump, and the installation space is small.

;3) Most conventional pneumatic conveying systems use a tall silo system, but the present invention uses a short hopper system, so powder and granules can be brought in easily and management is easy.

@jlt explanation of 4.1 The drawing is a flow sheet of the present invention.

l is a hopper, 2 is a pressurized tank, 3 is an air pump, 4a, 4b
is a suction pipe, 5a and 5b are exhaust pipes, 6 is a conveyance pipe, 7 is a filter in the hopper, and 8 is a hopper bottom opening/closing flap. , ≦3 is the upper limit level meter, 10 is the lower limit level meter, 11 is the suction side::, Turnip? , 12 is a three-way valve on the exhaust side.

Application agent: Kakafu Kaji

Claims (1)

[Claims] In a method of transporting powder using an air pipe, the air pump is activated to suck the powder from the storage area into a covered hopper through the suction pipe and deposit it, and when it reaches a certain height, the signal from the upper limit level meter The on-off valve at the bottom of the hopper opens and the powder is dropped into a pressurized tank connected to the bottom of the hopper. When the fall is finished, the on-off valve is closed, and the powder is then filtered by a filter installed above the inside of the hopper. Air is sucked into the air pump through the suction pipe connected to the lid, but by the operation of the three-way valve on the suction side, air is sucked in from outside, which is exhausted from the pump, and then passed through the exhaust pipe by the operation of the three-way valve on the exhaust side. The granules are press-fitted into the pressurized tank, press the powder and granules accumulated in the tank, and transport them out of the tank through a conveyor pipe connected to the bottom of the tank. When the granules in the tank are near the bottom, a signal from the lower limit level meter is signaled. The above-mentioned suction is restarted by , and the suction and pressure feeding are continuously repeated using one air pump.