JPS6216926A - Pneumatic conveying type quantitative feeder for powdery granule - Google Patents

Abstract

PURPOSE:To measure a powdery granule supply, by cutting off weight between the storage room side and the powdery granule projection pipe side and weight of powdery granules inside a projection pipe, a projection hopper plant and a pneumatic pipe with a flexible duct. CONSTITUTION:A weight detector 14 is laid down beneath an arm 18 being projectingly installed in three spots of an outer wall 3 of a storage room 1 and making this storage room suspend as a whole, and measures the total weight of the storage room 1, powdery granules housing in this room, a quantitative feed mechanism 2, a valve 7, a pneumatic pipe mixing part 12 and their accessory parts. And, with flexible ducts 6, 10 and 11, weight between the side of storage room 1 and the side of a powdery granule projection pipe 5 and weight of a pneumatic pipe 3 excluding the pneumatic pipe mixing part 12 are intercepted and, after the weight is made so as not to be imposed on the detector 14, the powdery granule supply is calculated from the decrease of the weight value measured.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a pneumatic transport type powder and granular material quantitative supply device that immediately conveys powder and granular material discharged by a quantitative supply device through a pneumatic transport pipe. The present invention relates to a powder and granular material quantitative supply device having a structure in which the amount of powder and granular material supplied can be measured by measuring the weight of the device.

[Conventional technology]

In conventional powder/granular material quantitative feeding devices, the total weight of the storage chamber, quantitative feeding mechanism, and their attached equipment is measured using a weight detector such as a load cell, and the amount of powder/granular material supplied is calculated from the weight reduction. .

[Problem that the invention seeks to solve]

If such a method for measuring the supply amount of powder or granular material is adopted in a pneumatic transport type powder or granular material quantitative supply device, the high pressure air of the pneumatic transport pipe will act on the storage chamber and the quantitative supply mechanism, causing a large error in weight measurement. In addition, the air pressure on the input hopper side that charges the powder into the storage chamber also acts on the storage chamber, and the differential pressure with atmospheric pressure also causes errors in weight measurements. Furthermore, since the storage chamber and the powder/granular material input pipe and the storage chamber and the air transport pipe are connected, there is a problem in that the weight of these peripheral devices is also measured.

The present invention aims to provide a pneumatic transport type powder/granular material quantitative supply device having a structure that can measure the accurate powder/granular material supply amount by skillfully solving the influence of the air pressure and the weight of peripheral equipment. A fixed quantity supply mechanism (2) is provided at the lower part of the storage chamber (1), and the powder and granules transferred by the fixed quantity supply mechanism are discharged directly into the air transport pipe (3) located close to the school. In the transportation type quantitative supply device, the storage chamber (11 input ports)
4) and the powder/granular material input pipe (5) are connected via a flexible/pull duct (6) midway to form a powder/granular material input path, and the powder/granular material is connected to both sides of the flexible pull duct (6). A valve (force, (8)) is provided to open and close the input passage in an airtight manner, and an atmosphere release passage (9) is provided to communicate the powder and granular material input passage space between (8) and the atmosphere. A flexible duct (I
I, , H and flexible/pull duct (In
, (An air transport pipe mixing part (14) between 11+ is fixed to the quantitative supply device, and a pressure equalizing pipe (13) is provided that communicates the air in the air transport pipe (3) with the air in the storage chamber (1), A storage chamber (1) that accommodates powder and granular material, a constant supply mechanism (2), an air transport pipe mixing section (1), a lower valve (7), and a weight detector that measures the total weight of these attached devices ( 14, and measures the amount of powder or granular material supplied from a change in the weight measured by the same weight detector.

[Effect]

In this invention, the storage chamber (
11 side and the powder fluid input pipe (5) side to prevent the weight of the powder fluid input pipe (5), the powder fluid inside it, and the input hopper equipment from being loaded onto the weight detector (14). In addition, the weight of the air transport pipe (3) except the air transport pipe mixed part +12 is blocked by the flexible ducts (10, (11)) so that the weight is not applied to the weight detector (14).

Next, if the amount of powder in the storage chamber (11) decreases significantly, the valve (7)
), (81 is opened, and a predetermined amount of powder is introduced into the storage chamber (1) from the powder injection pipe (5). Its release valve (7),
(Close the valve (81), open the atmospheric release passage (9),
) is set to atmospheric pressure in the powder fluid input channel space to eliminate the influence of air pressure acting on the storage chamber (1) side via the lower valve (7), and furthermore, the air pressure in the air transport pipe (3) is reduced to atmospheric pressure. storage chamber (1
) by communicating with the air in the air transport pipe (3)
The air pressure in the air transport pipe (3) is made the same as the air pressure in the storage chamber (1), and the air pressure in the air transport pipe (3) is supplied to the storage chamber (1) through a constant supply mechanism.
) side cancels out the aerodynamic forces acting on the weight detector (14
Make sure that the load is not applied to the At the same time, by making the air pressures of the storage chamber (1) and the air transport pipe (3) the same, disturbances in the movement of powder fluid are eliminated. In this way, the change in the weight value measured by the weight detector (l◆) can be accurately measured as the change in powder fluid, that is, the powder fluid supply amount.

〔Example〕

The constant current mechanism of this embodiment has a blade (1 blade) protruding from the outer periphery, and a rotating feed plate (11 is provided at the bottom of the storage chamber ()) which has a folding intermediate (li3) for storing powder fluid between the blades. It also has a weight detector (14 uses a load cell), and an arm (placed under the country) that protrudes from three locations on the outer wall of the storage chamber (1) and suspends the entire storage chamber in the air. This is to measure the total weight of the storage chamber (1), the powder fluid contained therein, the quantitative supply mechanism (2), the valve (force), the air transport pipe mixing section (12) and their attached parts. The powder fluid supply amount is calculated from the decrease in the weight value.If necessary, the rotation speed of the rotary supply plate Di is controlled so that the powder fluid supply amount reaches the target powder fluid supply amount.
1 is the rotating shaft of the rotating supply board, f20 is the stirring blade, (20 is the on-off valve provided in the middle of the atmosphere opening path (9), (22, (2
3 is a pole valve provided on the air transport pipe (3).

〔Effect of the invention〕

As described above, according to the present invention, it is possible to avoid picking up the weight of the outer peripheral equipment members connected to the air storage chamber (1), the quantitative supply mechanism, and the mixing part of the air transport pipe, and also to prevent the weight of the peripheral equipment members connected to the air transport pipe and powder input pipe side from being picked up. This prevents the air pressure from loading the weight detector, and also equalizes the air pressure in the air transport pipe and the storage chamber to eliminate disturbances in powder fluid transfer, making it possible to accurately measure the amount of powder fluid discharged. .

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the pneumatic conveyance type liquid powder metering supply device of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a longitudinal sectional view showing the metering mechanism, and FIG. FIG. 1 is an enlarged cross-sectional view taken along line 1-1. (1): Storage chamber (2): Quantitative supply mechanism (3)
: Air transport pipe (4) Two-stage inlet (5): Powder fluid input pipe (6): Atmospheric release path (10, (II): Flexible'-duct (14: Air transport pipe mixing section (13 = pressure equalizing pipe ( 14 = Weight detector patent applicant: Daimori Kogyo Co., Ltd. Representative: Toshima Sho Shiken No. 2
Figure 1

Claims (1)

[Claims] 1) A fixed amount supply mechanism (2) is provided at the bottom of the storage chamber (1), and the powder and granules transferred by the fixed amount supply mechanism are directly placed in the pneumatic transport pipe (3) located close to the storage chamber. In a pneumatic conveyance type metered supply device for discharging, the inlet (4) of the storage chamber (1)
A flexible duct (
6) to form a powder and granular material input path, and valves (7) and (8) are provided on each side of the flexible duct (6) to open and close the powder and granular material input path in an airtight manner. An atmosphere release path (9) is provided between the two valves (7) and (8) to communicate the powder/granular material input path space with the atmosphere, and a flexible duct (10) is provided before and after the discharge position of the air transport pipe (3). ),
(11) and a flexible duct (10) (
11) The air transport pipe mixing part (12) between the air transport pipes (12) is fixed to the quantitative supply device, and the air from the air transport pipe (3) and the storage chamber (1) are fixed.
A pressure equalizing pipe (13) communicating with the air inside is provided, a storage chamber (1) containing powder and granules, a constant supply mechanism (2), an air transport pipe mixing part (12), and a lower valve (7). and a weight detector (14) that measures the total weight of these attached devices, and measures the amount of powder and granular material supplied from changes in the weight measured by the weight detector. Feeding device.