JPH045468Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention makes the gas flow by pumping or suctioning the gas into the powder transport pipe system, and uses the energy of the gas to flow the gas. The present invention relates to a device for preventing clogging of powder and granular material at the outlet of a powder storage tank of a device for transporting powder and granular material, a so-called pneumatic conveying device.

(Disadvantages of Prior Art) Conventional pneumatic pumps have the following disadvantages.
That is, the connection part between the powder storage tank and the small diameter transport pipe,
That is, near the outlet of the storage tank, the flow cross-sectional area of the powder material becomes narrow rapidly, so the powder material becomes clogged in that area, which hinders the smooth transportation of the powder material. It was hot.

(Purpose of the invention) This invention was made in order to eliminate the above-mentioned drawbacks, and its purpose is to provide a reliable and low-cost clogging prevention device for powder and granular materials.

(Example) This invention will be described below based on an example shown in the drawings.

The powder storage tank 1 has a hopper 3 at its lower end, an outlet 4 is formed at the lower end of the hopper 3, and a metal connecting member 5 as described below is connected to the outlet 4. That is, the connecting member 5 is formed with a vertically long powder passage 18 whose center line is vertical or nearly vertical, and this powder passage 18 has a tapered portion that narrows downward from the inlet end. 1
9, and the lower end of the tapered part 19 is followed by a powder outlet part 22 whose center line is directed diagonally downward, and at the outlet end of this outlet part 22,
The inlet end of a flexible transport pipe 6 having an inner diameter equal to that of the transport pipe 6 (for example, an inner diameter of about 8 mm) is connected directly or indirectly, and the outlet end thereof is connected directly or indirectly to the inlet 8 of the powder collector 7.
The outlet 9 of the powder collector 7 is connected to the inlet 12 of a powder receiving hopper 11 of a molding machine, etc., and the conduit 13 is connected to the exhaust port 10 of the powder collector 7. A suction port 15 of the vacuum pump 14 is connected through the pipe, and an exhaust port 16 of the vacuum pump 14 is connected to the outlet portion 22 of the connecting member 5 via the conduit 13 .

The connecting member 5 is formed with a vertically movable body accommodating portion 21 connected thereto so that the axis is common to that of the tapered portion 19, and a vertically movable body 20 as described below can move forward and backward into this accommodating portion 21. It is contained in That is, the vertically movable body 20 has a conical upper portion, and is caused to reciprocate at a predetermined period by a fluid pressure cylinder 25 attached below the housing portion 21. The vertically moving body 2
0 protrudes into the powder passage 18 and closes the outlet part 22, or retreats from the powder passage 18 and closes the outlet part 22.
2 can be opened.

Note that the actuating device for the vertically movable body 20 is not limited to the fluid pressure cylinder 25.

(Effect of Example) Next, the operation of the embodiment device will be explained.

By driving the vacuum pump 14, the powder is transferred from the powder storage tank 1 to the powder passage 18 of the connecting member 5.
It is supplied to the powder receiving hopper 11 through the transport pipe 6 and the powder collector 7, and at this time, the vertical moving body 20
moves back and forth at a predetermined period as shown below. That is, when the vertical moving body 20 moves upward, the powder passage 18
When it moves downward, it retracts into the storage section 21, thereby stirring the powder and granular material in the storage tank 1 and smoothly guiding it to the powder passage 18.

In addition, the gas for transporting the powder and granules is supplied to the powder and granule collector 7.
After reaching the temperature, it is separated from the powder and granules, and the vacuum pump 14
In other words, in this embodiment, since the transport pipe system is a closed loop, it is possible to use a gas other than air, such as nitrogen, as the transport gas. It is possible to transport powder and granular materials that dislike moisture in a predetermined dry state.
It goes without saying that this invention can be applied to a closed-loop transport pipe system pneumatic feeding device, and the powder passage 1 when the vertical moving body 20 moves downward in the embodiment
The exit from 8 does not necessarily have to be a complete exit.

(Effects of the invention) This invention has the following effects due to the above-mentioned configuration.

Since the powder and granules are stirred by the extremely simple means of vertically reciprocating the vertical moving body 20, clogging of the powder and granules near the outlet 4 of the storage tank 1 can be reliably prevented at low cost.

Since the flow rate of the granular material is changed by the vertical movement of the vertically movable body 20, and the flow becomes intermittent, clogging of the granular material can also be prevented.

[Brief explanation of the drawing]

The drawing is a system diagram showing an embodiment of this invention. 1...Powder storage tank, 4...Outlet, 5...Transport short pipe, 6...Transport pipe, 20...Vertical moving body.

Claims (1)

[Scope of utility model registration request] An outlet 4 is formed at the lower end of the powder storage tank 1, a connecting member 5 is connected to the outlet 4, and the connecting member 5 has a powder passage that is long in the vertical direction with its center line being perpendicular or almost vertical. 18 and this powder passage 18
A lead-out portion 22 whose center line is directed diagonally downward and a vertically movable body accommodating portion 21 connected to the lower part of the powder passage 18 are formed, and the vertically movable body accommodating portion 21 has a conical upper portion. Vertical moving body 20
A device for preventing clogging of powder and granular material at the outlet of a powder and granular material storage tank of a pneumatic feeding device, in which a granular material storage tank is fitted so as to be vertically movable.