JPS62218327A - Suction type granular body air-conveying method and its device - Google Patents

Abstract

PURPOSE:To confirm brimming and quickly dissolve the clogging of a in a conveyance line, the slip off or breakage of a conveyance pipe constituting the conveyance line, and the blinding of a filter in a hopper by effectively utilizing the pressure fluctuation of the conveying air itself. CONSTITUTION:Under an abnormal conveyance condition when an air source is not operating or a hoper 1 is brimmed, if the suction pressure of the absorbing air becomes a fixed value or less, a dumper 14 is opened by the weight of the granular body, and an opening/closing valve 11 closes an air passage 4a. When the dumper 14 becomes an almost completely closed condition for the material conveyance to the hopper 1, an absorbing stream of the outside air is strongly applied into the hopper 1 through a gap between the material outlet 7 at the lower outside of the hopper 1 and the dumper 14, the granular body stuck or remaining near the lower end edge of the hopper 1 inner wall is separated upward and conveyed, thus the grannular body is prevented from being bitten into the dumper 14, and the shutoff characteristic of the dumper 14 is improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a method for transferring powder and granular materials such as synthetic resin materials, pharmaceutical materials, food materials, etc. from a material storage section to a molding machine or the like by suction air force. Regarding the method and equipment for transporting powder and granules to the pump, in detail, there is a suction type that separates powder and granules from suction air and transports them in the middle of the transportation line from the suction start point of the powder to the suction air source. The present invention relates to a method for pneumatic transportation of powder and granular materials and an apparatus therefor.

(Prior art) In order to maintain a steady and normal transport state using the above pneumatic transportation method, it is necessary to check whether the hopper is full of powder or granules, and to check if the powder or granules are clogged in the middle of the transportation line. early detection of disconnection or breakage of hoses (transport pipes) that make up the transport line, or clogging of filters in the hopper, and detection of phenomena other than normal transport conditions, such as material shortages in the material storage section. It is necessary to take appropriate measures to deal with these problems as soon as possible, but no conventional methods or devices have taken such measures.

In other words, conventional methods include, for example, capturing the phenomenon of whether the hopper is full of powder or granules (a set amount);
In other words, to give an example of fullness confirmation, conventionally, fullness can be calculated from the product of the transport volume per unit time of the transport line and the transport operating time, so measures such as controlling the transport operating time using a timer have been adopted. It's nothing more than that.

(Problem to be solved by the invention) However, in the case of the above conventional timer control,
Even if the type of powder or granular material to be transported is the same, the amount transported per unit time will vary depending on differences in specific gravity, properties, shape, etc., and also depending on the bending of the transportation line, etc. Therefore, there are problems such as over/deficiency in the amount of fullness cannot be avoided and accurate confirmation of fullness is difficult. In addition, no product has been provided that sufficiently eliminates other phenomena such as clogging of powder and granular material in the transportation line, disconnection or breakage of the transportation pipe, clogging of the filter in the hopper, and shortage of material in the material storage section. .

This invention was devised in view of the above circumstances, and by effectively utilizing the pressure fluctuations of the transport air itself, it is possible to confirm fullness, prevent clogging of powder or granules in the transport line, and prevent the transport line from becoming clogged. To provide a device that can quickly and accurately eliminate inconvenient phenomena such as detachment or breakage of constituent transport pipes, clogging of filters in hoppers, and material shortages in material storage sections at low cost, as well as the above-mentioned The purpose of this invention is to provide a device that is extremely rational and has a simple structure when carrying out the method.

(Means for Solving the Problems) The suction type pneumatic transportation method for powder and granule according to the first invention, which was taken to achieve the above object, includes a suction air source for powder and granule, In a suction-type powder and granular material pneumatic transportation method comprising at least a hopper with a filter for separating and transporting suction air, The purpose of this method is to capture the phenomenon of the transport state and then transmit an electric signal for either or both of the steady transport state and the unsteady transport state.

Further, the suction type powder pneumatic transportation device according to the 20th invention is the same as the 20th invention. The present invention is for carrying out the method of the invention, comprising: a suction air source for powder and granular material; a hopper equipped with a filter for separating the powder and granular material from its transport air; A transport pipe configured to suck and transport powder and granules from a material storage section through a suction port, and a powder and granular material collection section in the hopper through a filter are connected at one end to an air passage defined in the hopper and at the other end. and a suction pipe connected to a suction air source, the suction-type powder and granular material pneumatic transport device comprising: a transport line consisting of the transport pipe, an air passage in the honbar, and the suction pipe, or a transport line connected thereto; A pressure sensor that detects that there is a pressure drop greater than a set value with respect to the air pressure in a steady transport state at any point in the transported state, and either a steady transport state or an unsteady transport state connected to this pressure sensor. Alternatively, a signal transmitter for transmitting both electrical signals may be provided.

(Function) According to the suction-type pneumatic transportation method for powder and granular material according to the first invention, the hopper is full of powder and granular material, the transportation line is clogged with powder, and the transportation pipe is blocked. If unsteady transport conditions occur such as detachment or damage, clogging of the filter in the hopper, or lack of material in the material storage section, the air pressure in the transport line or the points connected to it will be lower than the air pressure in steady transport conditions. fluctuate. Therefore, by detecting the fluctuation in air pressure at this time using a pressure sensor, etc., and then transmitting an electric signal for either or both of the steady transport state and unsteady transport state, it is possible to Regardless of the existence of factors that change the amount of transportation per unit time, such as the type, physical properties, or the degree of bending of the transportation line, the aforementioned inconvenient phenomena can be resolved quickly, accurately, and with high precision.

Further, according to the suction-type powder or granular material pneumatic transportation device according to the 20th invention having the above-described characteristic structure, the fluctuation of the air pressure during implementation of the transportation method according to the 1st invention, that is, the change in air pressure that is equal to or higher than the set value The pressure drop is reliably detected by a pressure sensor installed at any point on the transportation line or a point connected to it, and upon this detection, an electrical signal is transmitted by a signal transmitter connected to the pressure sensor. It accurately captures various abnormal phenomena and sends signals.

(Example) An example of the present invention will be described below based on FIGS. 1 to 5.

(S) is a hopper (1) equipped with a filter (2) that can be freely taken out and put in to separate the powder and granular material to be transported from the transport air, and a transport connected to the material intake (6) of the hopper (1). The material is suction-transported to the hopper (1) via the transport pipe (8) by the suction force of the suction air source Q31. This is a suction type pneumatic transport device designed to

The hopper (1) has a particulate material collection part (3) inside the filter (2), and an annular space between the filter (2) and the outer wall of the hopper (1) is defined as an air passage (4). It is formed. In addition, the material inlet (6) passes through the canopy (5) at the upper part of the hopper (1), and the material outlet (7) is opened and closed by a damper α ship described later at the lower end.
are formed respectively.

A suction nozzle (8a) that can be taken in and out of a material storage part (9) such as a tank, bag, or silo is connected to the suction port at the tip of the transport pipe (8).
a) may be absent.

One end of the suction pipe aΦ is connected to the air passage (4) at the bottom of the hopper (1) via an on-off valve (Ill), and the other end is connected to the above-mentioned air passage (4) at the bottom of the hopper (1) via a secondary filter for dust removal. The blower α hot water, which is the suction air source, is connected.

The transport pipe (8) (including the suction nozzle (8a)) and the hole Z
The transportation line (2) consisting of the air passage (4) in the air passage (1) and the suction pipe α (2) or any location connected thereto, specifically (A in Figure 1) ,(B),
At any point such as point (C) ((A) in the example), there is a pressure sensor (2+1) that detects fluctuations in air pressure and captures phenomena in the transport state, and a steady transport connected to this pressure sensor (21). A signal transmitter Q3 is provided which emits an electric signal indicating either or both of the state and the unsteady transport state.

This pressure sensor 01) and signal transmitter (2 can be any arbitrary one. Pressure sensor + 21)
The pressure sensor (2) in this embodiment may be any electrical type such as a semiconductor pressure sensor.
+1 detects that there is a pressure drop greater than the set value with respect to the air pressure in the steady state of transportation, and the 5th
As shown in the figure, it is provided integrally with a signal transmitter (221) equipped with alarm means (a) such as a lamp and a buzzer.

That is, a magnet Q4+ built into the main body attached to a part of the transportation line fffl), a spring 121 that biases this magnet r2@ to move toward the reed switch (to) side which is a signal transmitter, It consists of a secondary air intake (21) 1 formed in the main body 12m,
During the steady transportation state, the magnet (2) is moved by suction pressure in a direction away from the signal transmitter Q21 against the springs Q to open the secondary air intake port Q. On the other hand, when there is a pressure drop greater than the set value with respect to the air pressure in the steady state of transportation, that is,
Phenomena other than normal transport conditions occur, such as the inside of the hopper (1) becoming full, powder or granular material clogging in the transport line, a transport pipe coming off or broken, or a material shortage in the material storage area. When the air pressure in the transport line Q drops, the magnet Q41 moves and operates in the direction of closing the secondary air intake port (2g+) due to the urging force of the spring shoes.The operation signal is sent to the signal transmitter +221. is connected to receive and communicate to the suction air source 03 to automatically stop its operation.

The pressure sensor (21) may be a diaphragm or the like, and the signal transmitter in that case may be equipped with a switch mechanism for switching on/off, and the design can be changed as appropriate as described above. Moreover, it goes without saying that the pressure sensor QB and the signal transmitter (Inc.) may be separate units.

The damper 0 is connected to the hopper (1) as shown in Figure 2.
) is fixed to a damper arm QSI which is pivotably pivoted to a part of the damper arm (13) that avoids the air passageway (4a) which communicates the air passageway (4) with the suction pipe OI. The pivot 01 has the air guide path (4a
The on-off valve aIl that opens and closes ) is fixed, and the damper 00 and the on-off valve αυ are configured to see-saw with the pivot αQ as a fulcrum. That is, in the transportation state in which the suction air source α is activated, the on-off valve Oυ automatically opens in the air flow direction due to the suction pressure of the suction air, and the damper α opens the material outlet (7).
), and the powder material is sucked and transported from the transport pipe (8) into the homper (1) (see the solid line in Figure 2). At this time, the signal from the signal transmitter is emitted or stopped. Ru.

On the other hand, when the suction air tAa1 is not activated or when the homper (
1) When the suction pressure of the suction air falls below a certain value during an unsteady transportation state such as when the container is full, the damper (141) opens as shown by the chain line in Fig. 2 due to the weight of the powder or granules. At the same time, the on-off valve closes the air passage (4a). At this time, the signal from the signal transmitter is transmitted or stopped.

In this way, with the structure in which the damper 041 is closed by the suction pressure of the suction air from the suction air source α, when the damper Oa is almost completely closed, the material outlet (7) at the lower outside of the hopper (1) is closed. ) and the damper circle, a suction flow of outside air acts strongly toward the inside of the hopper (1), and the powder and granules attached or remaining near the lower edge of the inner wall of the hopper (1) are removed. Since the damper 00 is separated and transferred upward, it is possible to prevent the particulate material from getting caught in the damper α-yu, thereby making it possible to effectively close the damper 00.

(An example of an operation of this embodiment) An example of an operation of this embodiment will be explained below based on FIGS. 6 to 8.

FIGS. 6 to 8 show an example of operation explanatory diagrams taking as an example a case where a material shortage occurs in the material storage section (9).

(1) In the case of a steady transport state with no material shortage (Fig. 6) Pressure sensor Q1) operates normally in a pulse wave shape, and the material transport from the material storage section (9) to the hopper (1) is transferred to the hopper fl+. The material transport (A) and material discharge (0) are reversed, and the signal transmitter Qυ remains stopped and no alarm is displayed. In this case, the lamp is turned off during material transportation (a), and is turned on when material transportation is completed (full) and material is being discharged (b), but the lamp is not limited to this.

(2) In the case of unsteady transportation due to material shortage (Figure 7) If the material in the material storage section (9) runs out during transportation, the pressure sensor (21) will no longer operate normally and the counter will display three or more times in a row. If the device does not operate normally, the signal transmitter (2z) will send an alarm. However, in this case, the device will not stop operating.

(3) When material is supplied (Fig. 8) When the material is supplied to the material storage section (9) due to the alarm in (2) above, the operation of the pressure sensor r20 returns to the normal state, and the alarm means is automatically activated. It will be reset to normal operation.

Note that the damper Oa and the on-off valve 0υ are not limited to the structure shown in the drawings (the design can be changed as appropriate).

(2a) is the handle of the filter (2), αD is the bearing, αD is the collar, and 091 is any receiving part of the synthetic resin molding machine, hopper dryer, silo, etc.; It is shown.

(Effects of the Invention) The present invention has the above configuration, and the first invention includes a suction air source for powder and granules, and a filter that separates and transports the powder and the suction air. In a suction type pneumatic transportation method for powder and granular materials, which includes at least a hopper, fluctuations in air pressure in the transportation line or a location connected thereto are detected to capture phenomena in the transportation state, and then the steady transportation state is detected. (20) for carrying out the method;
The invention is provided with a suction air source, a hopper, a transport pipe, and a suction pipe, and a transport line consisting of the transport pipe, an air passage in the hopper, and a suction pipe, or any part of the transport line that is connected to the transport pipe in a steady state. A pressure sensor that detects when the air pressure in the transport state has dropped by more than a set value, and a signal connected to this pressure sensor that sends an electrical signal for either or both of the steady transport state and unsteady transport state. Since the device is equipped with a transmitter, it has the following effects.

fil During unsteady transportation of powder and granular material, the pressure sensor detects that there is a pressure drop greater than the set value with respect to the air pressure in the steady transportation state, and the signal generator sends a signal based on this detection, confirming the fullness. We can quickly and accurately detect all inconvenient transportation conditions, such as clogging of powder or granules in transportation lines, disconnection or breakage of transportation pipes, clogging of filters in hoppers, and material shortages in material storage areas. It can be resolved with high precision.

(2) Since the hopper can always be transported in a full state, the transport efficiency per unit time can be greatly improved compared to the conventional method using a timer.

[Brief explanation of drawings]

Each of the figures shows one embodiment of the present invention; Fig. 1 is an overall schematic diagram with a part cut away, Fig. 2 is a vertical sectional view of the main part, and Fig. 3 is the right side of Fig. 2. Front view, Figure 4 is Figure 2
- An X-ray sectional view, and FIG. 5 is an enlarged half-box sectional view of the pressure sensor. (1)...Hopper, (4)...Air passage, (6)
...Material inlet, (7)...Material outlet, (8)...
Transport pipe, Ql...suction pipe, aυ...open/close valve, tap...
- Suction air source, θO...damper, +21...transport line, [2+1...pressure sensor, Qno...signal transmitter. Figure 1 Figure 2 Figure 4 Procedural amendment August 5, 1986 1. Indication of the case 1988 Patent Application No. 62763 2. Name of the invention Suction type pneumatic transportation method for powder and granular material and its device 3. Relationship with the case of the person making the amendment Patent applicant address: 6-5-26 Tanimachi, Minami-ku, Osaka City
Name: Matsui Manufacturing Co., Ltd. Representative: Matsu
Osamu Ii 4, agent address: 1-12-19F Nishihonmachi, Nishi-ku, Osaka 550
il Page 7, line 12 of the specification, page 8, lines 5 to 6
In line 8, line 20 on page 9, line 1, and line 13 on page 10, line 14, the phrase ``at a connected location'' is replaced with ``at a connected location (such as the suction air source). ” he corrected.

Claims (9)

[Claims] (1) Suction-type powder and granule air comprising at least a powder and granule suction air source (13) and a hopper (1) with a filter (2) that separates and transports the powder and the suction air In the transportation method, a phenomenon in the transportation state is detected by detecting fluctuations in air pressure in the transportation line (20) or a place connected thereto, and then electricity is detected in one or both of the steady transportation state and the unsteady transportation state. A suction type pneumatic transportation method for powder and granular material characterized by transmitting a signal. (2) The suction type pneumatic transport method for powder and granular material according to claim (1), wherein the phenomenon in the transport state is captured during an unsteady transport state. (3) Claim No. 1, wherein the trapping phenomenon is to confirm that the hopper (1) is full of powder or granular material.
The suction-type pneumatic transport method for powder and granular material according to item (2) or item (2). (4) The suction type pneumatic transportation of powder and granular material according to claim (1) or (2), wherein the trapping phenomenon is a clogging phenomenon of powder and granular material in the transportation line (20). Method. (5) The above-mentioned trapping phenomenon is caused by the separation filter (2).
) or a material shortage phenomenon in a material storage section. (6) Based on the phenomenon capture, the suction air source (1
3) The suction type pneumatic transportation method for powder and granular material according to any one of claims (1) to (5), wherein the operation is automatically stopped. (7) A hopper (1) equipped with a powder suction air source (13) and a filter (2) for separating the powder and its transport air, and a base end connected to this hopper (1). A transport pipe (8) which sucks and transports the powder and granules in the material storage section (9) through the suction port at its tip, and a powder and granule collector (3) in the hopper (1) through the filter (2). ) means that one end is connected to the divided air passage (4) and the other end is connected to the suction air source (
This is a suction type powder air transport device comprising a suction pipe (10) connected to the transport pipe (8), an air passage (4) in the hopper (1), and a suction pipe (13). A pressure sensor (21) that detects that there is a pressure drop of more than a set value with respect to the air pressure in a steady state of transportation at any point in the transportation line (20) consisting of the transportation line (20) or a location connected to the transportation line (20). and a signal transmitter (22) that is connected to the pressure sensor (21) and transmits an electric signal in either or both of the steady transport state and the unsteady transport state. Granule pneumatic transport equipment. (8) The pressure sensor (21) and the signal transmitter (22)
The suction-type powder and granular material pneumatic transportation device according to claim (7), wherein the suction air source (13) is linked to automatically stop the operation of the suction air source (13). (9) The operating setting value of the pressure sensor (21) is made to correspond to the falling pressure value when the hopper (1) is full of powder or granular material, or The suction-type powder and granular material pneumatic transportation device according to item (8).