JP2004256311A - Powder and grain force feed supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a force feed supply device for surely preventing a backflow of powder and grain by pressurized air with a simple structure and a mechanism. <P>SOLUTION: This force feed supply device is constituted so as to exhaust the pressurized air in an intermediate chamber 30 to a device external part via an exhaust filter 14 by sending the pressurized air into a housing chamber 11 by opening a first opening-closing valve 20 in a state of closing a second opening-closing valve 40 after performing force feed chamber replenishing operation for supplying the powder and grain in the intermediate chamber 30 to a force feed chamber 50 by opening the second opening-closing valve 40 in a state of closing the first opening-closing valve 20 when a low level detecting means 51 detects a low level state. This force feed supply device performs intermediate chamber replenishing operation for discharging and supplying the powder and grain stored in a weighing vessel 12 to the intermediate chamber 30 and weighing vessel supply operation for receiving a prescribed quantity of powder and grain in the weighing vessel 12 from the external part in a state of closing at least the first opening-closing valve 20. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a granular material pressure feeding and supplying apparatus that continuously supplies a granular material in a pressurized atmosphere.

  As a method for improving the ground, the improved rod on which a stirring blade protrudes is inserted into the ground while rotating, and in the insertion process and the lifting process, the solidified material in the form of a granular material (hereinafter, referred to as the improved rod) It is known that the soft ground is treated by spraying a solidified material) to form a columnar solidified body in the ground. For example, what is known as a deep layer processing method corresponds to this.

In the ground improvement using such a powder solidified material, a device is used in which the powder solidified material is pumped by being put on pressurized air (pressurized gas, for example, compressed air). Examples of such a pressure supply device include those disclosed in JP-A-8-113370, JP-A-8-113369, JP-A-10-59542, and the like.
JP-A-8-113370 JP-A-8-113369 JP-A-10-59542

  In the granular material pressure supply device, the granular material and the pressurized air are sent while being sent in a separate system, and the granular material is sent on the pressurized air, so the granular material due to the pressure air leaking to the granular material supply side Must prevent backflow. Considering the application to the above ground improvement publication, it is easy to carry in to the site, small installation area, easy operation and maintenance, large capacity supply, etc. Required.

  However, the conventional powder pressure supply device only employs a complicated structure in order to prevent backflow of the powder due to the pressurized air. As a result, there are problems that maintenance such as internal cleaning is complicated, and that the apparatus is excessively large and is difficult to carry in and install. Furthermore, it was difficult to control the amount of powder used.

  Therefore, the main problem of the present invention is that it is possible to reliably prevent the backflow of the granular material due to the pressurized air, and the simple structure and mechanism, the maintenance such as the internal cleaning is very easy, and the compact and large-capacity pumping is performed. It is possible to provide a powder pressure supply device capable of easily and accurately managing the amount of powder used.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A storage chamber having a powder supply port at the top and a discharge port at the lower end, and a powder chamber that is provided in the storage chamber, receives and stores the powder from the outside via the powder supply port. A powder metering supply means having a measuring container configured to discharge the powdery substance into the storage chamber and a measuring means for measuring the amount of the powdery substance in the measuring container;
An intermediate chamber connected to the lower end discharge port of the storage chamber via a first on-off valve and having a discharge port at the lower end;
A pumping chamber connected to the lower end outlet of the intermediate chamber via a second on-off valve;
A predetermined amount of powder and granules stored in the pressure feeding chamber are continuously taken out, and are sent out to the outside by being put on the pressurized air,
Comprising a low level detecting means for detecting a low level state in which the amount of stored granular material in the pumping chamber does not reach a predetermined low level;
At the time of the powder supply operation to the outside, while continuously operating the delivery means to perform continuous quantitative delivery to the outside,
When the low level state is detected by the low level detection means, the second on-off valve is opened with the first on-off valve closed, and the granular material in the intermediate chamber is supplied to the pressure feed chamber. Then, the first on-off valve is opened with the second on-off valve closed, and the pressure air in the intermediate chamber is sent into the storage chamber and exhausted to the outside through the exhaust filter. In addition, the intermediate chamber replenishing operation for discharging the granular material stored in the measuring container and supplying it to the intermediate chamber, and at least the first on-off valve being closed, is placed inside the measuring container from the outside. Configured to perform a weighing container supply operation that accepts a fixed amount of powder,
A granular material pressure feeding device characterized by that.

<Effect>
In the apparatus of the present invention, when the low level state is detected by the low level detection means, the second on-off valve is opened with the first on-off valve closed, and the granular material in the intermediate chamber is removed. A pressure feeding chamber replenishing operation for supplying the pressure feeding chamber is performed, and then the first on-off valve is opened with the second on-off valve closed, and the granular material stored in the measuring container is discharged and supplied to the intermediate chamber. An intermediate chamber replenishment operation and a weighing container supply operation for receiving a predetermined amount of powder particles from the outside into the weighing container are performed with at least the first on-off valve closed. Therefore, although pressure air is mixed in the pressure feeding chamber, at least one of the first and second on-off valves is always closed, so that it is possible to effectively prevent the backflow of the powder particles due to the pressure air, An appropriate amount of powder particles can always be stored in the pressure feeding chamber, and powder particles can be continuously delivered to the outside by a rotary feeder.

  In order to prevent such backflow, the present invention has a very simple structure because the solidification material supply path is cut off at intervals by two on-off valves, and maintenance such as internal cleaning is very easy. It is. Furthermore, since the measuring container and the intermediate chamber only need to store sufficient powder particles for replenishing the powder particles to the pressure feeding chamber, the apparatus can be downsized.

  On the other hand, when the on-off valve is used, the powder and granule supply to the pressure feeding chamber becomes a batch type. However, since the rotary feeder finally sends out to the outside, the powder and granule can be continuously supplied to the outside.

  As described above, according to the powder supply device of the present invention, it is possible to reliably prevent the backflow of the powder by pressure air, and it has a simple structure and mechanism, and maintenance such as internal cleaning is very easy. Therefore, there are advantages such as being compact and capable of being pumped with a large capacity and being able to easily and accurately manage the usage amount of the granular material.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG.1 and FIG.2 has shown the 1st form of the granular material pressure feed apparatus which concerns on this invention. This granular material pressure supply device mainly includes a powder metering means 10, a first on-off valve 20, an intermediate chamber 30, a second on-off valve 40, a pressure feed chamber 50, a delivery means 60, and a low level detection means 51. It is composed of

  The granular material metering means 10 includes a storage chamber 11 having a granular material supply port 11i at the top and a discharge port 11x at the lower end, and an externally provided granular material supply port provided in the storage chamber 11. The measuring container 12 is configured to receive and store the granular material and discharge the stored granular material to the outside, and the load cell 13 as a measuring means for measuring the amount of the granular material in the measuring container 12. , 13. As can be understood from this configuration, the apparatus of the present invention is a large storage tank (such as a silo provided with a supply opening and closing device on the outlet side) with respect to the upper granular material supply port 11i of the granular material measurement and supply means 10 ( It is assumed that the granular material is supplied from (not shown).

  Particularly in the first embodiment, the exhaust filter 14 is communicated with the upper portion of the storage chamber 11. The weighing container 12 has a shape with an open top surface, and one end of each of the rotary shafts 15 and 15 is connected to both side surfaces. The other end of each of the rotary shafts 15 and 15 is a rotational drive source such as a motor. The rotary drive sources 16 and 16 are fixed to internal side plates 17 and 17 that are suspended and supported via load cells 13 and 13 from the inner surface of the top plate 11u of the storage chamber 11, respectively. Yes. Therefore, the measuring container 12 is suspended in the storage chamber 11 via the load cells 13 and 13, and the amount of powder particles inside can be measured by the load cells 13 and 13, and is inverted by the rotary drive sources 15 and 15. It is possible to discharge the stored powder particles inside. The state after inversion is indicated by a dotted line.

  An intermediate chamber 30 is connected to the lower end discharge port 11x of the storage chamber 11 via the first on-off valve 20, and is pumped to the lower end discharge port 30x of the intermediate chamber 30 via the second on-off valve 40. A chamber 50 is connected. As shown in the figure, the open / close valves 20 and 40 are provided with rotary shafts 22 and 42 in the horizontal crossing direction in the pipelines 21 and 41, respectively, and the rotary shafts 22 and 42 have plate shapes that can block the pipeline 21. The valve bodies 23 and 43 can be attached, and the rotary drive sources 24 and 44 of the rotary shafts 22 and 32 provided outside the pipeline can be used. In the illustrated example, the reciprocating drive force of the cylinders 25 and 45 is mechanically converted to the rotational direction of the rotary shafts 22 and 32 and transmitted to the rotary shafts 22 and 42. On the other hand, since each chamber 11, 30, and 50 conveys the granular material by falling under its own weight, it is desirable to use a cylindrical body whose inner diameter becomes smaller toward the lower end as shown in the figure.

  In particular, a low level sensor 51 is provided at a predetermined height position in the pressure feeding chamber 50, and a low level state in which the amount of particles in the pressure feeding chamber 50 does not reach a predetermined amount by the low level sensor 51. It can be detected. The height position of the low-level sensor is, for example, for the external delivery means 60 to continuously supply the powder particles in a constant amount from when the low-level state is detected until the powder particles are replenished in the pumping chamber 50. The height is set to a level corresponding to a sufficient amount of granular material.

  Further, the pressure feeding chamber 50 is provided with a sending means 60 for continuously taking out a predetermined amount of the granular material stored inside and sending it to the outside by putting it on the pressurized air.

  For example, as shown in the drawing, the external delivery means 60 includes a rotor case portion 61 that is continuous from the lower end portion of the pressure feed chamber 50 and a rotor 62 that is continuously rotated in a predetermined direction in the rotor case portion 61. The continuous quantitative supply type rotary feeder and the delivery unit that feeds powder particles cut out by the rotary feeder on the pressure air from a pressure air supply source such as a compressor (not shown). The rotor 62 is rotatable around a horizontal (or horizontal) rotary shaft 63, and a large number of partition blade portions 64 projecting in the radial direction are formed at equal intervals in the circumferential direction on the outer peripheral surface of the rotary shaft 63. A space between the blade portions 64 is formed as a pocket 65. The rotation shaft 63 is connected to a rotation drive source such as a motor (not shown) connected to the outside of the case portion 61, and the rotor 62 is configured to rotate by this rotation drive source. Of course, in the present invention, other known rotor shapes can be used. Further, as shown in the drawing, a powder body outlet 66 is formed at the lower end portion of the side surface of the rotor case 61 that is orthogonal to the direction of the rotation axis 63 of the rotor 62 as shown in the figure, and the lower end portion of the side surface facing this is formed. It is possible to adopt a configuration in which a pressurized air inlet 67 from the pressurized air supply source is formed and the pressurized air from the pressurized air inlet 67 circulates to the granular material outlet 66 through the pocket 65 at a position corresponding to these.

  A plurality of screw feeders such as those using a screw feeder described in Japanese Patent Application Laid-Open No. 8-113370, those shown in FIGS. 6 to 8 of Japanese Patent Application No. 2001-233135, and those shown in FIGS. It is also possible to use one that can continuously supply a constant amount to the external delivery path.

  On the other hand, in the first embodiment, the amount of powder in the measuring container 12 can be measured by supporting the measuring container 12 with respect to the storage chamber via the load cell. As shown in FIGS. 3 and 4, the entire powder and particle measuring / feeding means 10 is suspended and supported via a load cell 13 from a gantry 70 (only a part of which is shown), and the weighing container is subtracted from the weighing container. You may comprise so that the amount of the granular material in 12 can be measured. In this case, the storage chamber 11 of the granular material metering means 10 and the first on-off valve 20 are connected by a flexible joint (for example, a resin bellows tube such as rubber) 80 that can be expanded and contracted in the vertical direction. A portion below the on-off valve 20 is separately fixed to the gantry 70. Further, in this case, as shown in the figure, the rotating shaft 15 of the measuring container is communicated to the outside of the storage chamber, and is connected to the rotational drive source 16 fixed to the outer peripheral surface of the storage chamber 11, so that the inner side plate 17 can be omitted.

  Moreover, in the said 1st form, although the measurement container 11 is comprised so that a storage granular material may be discharged | emitted by inversion, like the 3rd form shown in FIG. 5, and the 4th form shown in FIG. In addition, a hopper-shaped measuring container 90 in which the entire upper surface is a granular material receiving opening 91 and a granular material discharge port 92 is formed at the lower end portion, and an open / close valve is provided at the lower end discharge port 92 is used. You can also. As shown in the figure, the on-off valve has a weight-like valve body 93 that fits into the discharge port from below, and the weight-shaped valve body 93 that is fixed to the top plate 11u moves up and down to fit and remove from the discharge port 92. And a cylinder 94 for the purpose. Further, the third embodiment and the fourth embodiment are different in how the weighing container 12 is suspended, and the former corresponds to the first embodiment in that the weighing container 12 is supported with respect to the storage chamber via the load cell 13. The latter employs a powder particle measuring configuration. In the latter, the whole powder particle measuring and supplying means 10 is supported by being suspended from a mount 70 via a load cell 13, and the storage chamber 11 of the powder and particle measuring and supplying means 10 is supported. And the first on-off valve 20 are connected to each other by a flexible joint 80, and a granular material measuring configuration corresponding to the second embodiment is adopted.

  On the other hand, the operation mode of the thus-configured powder compaction feeding device of the present invention is as shown in FIG. Note that FIG. 7 representatively shows the case of the apparatus of the third embodiment, but the same applies to the case of the apparatus of another form.

(When starting the device)
When the apparatus is started, first, the external delivery means 60 does not perform external delivery, that is, with at least the rotary feeder being stopped, each of the pressure feeding chamber 50, the intermediate chamber 30 and the measuring container 11 stores a predetermined amount of powder. (Not shown).

  For this reason, first, a granular material is supplied and supplied to the measuring container 90 through the supply port 11i from an external large storage tank such as a silo. At this time, the amount of the granular material in the measuring container 90 is measured by the load cell 13, and the supply from the outside is automatically stopped when the predetermined amount is reached. When the metering is finished, the on-off valve of the measuring container 90 is opened to discharge the internal powder particles into the storage chamber 11, and the first on-off valve 20 and the second on-off valve 30 are opened and closed as appropriate. The granular material is fed to the chamber 30 or the pressure feeding chamber 50. The powder and granular material can be supplied from the external storage tank a plurality of times as necessary. In addition, when each of the pressure feeding chamber 50, the intermediate chamber 30 and the measuring container 90 has already stored a predetermined amount of powder particles, it is not necessary to perform the operation at the time of starting the apparatus.

(During powder supply operation)
During the powder supply operation to the outside, the external delivery means 60 is always operated to perform continuous quantitative delivery to the outside. More specifically, as shown in FIG. 8, the rotor 62 of the rotary feeder is continuously rotated in a predetermined direction, and the granular material P3 stored in the pressure feeding chamber 50 is sequentially received in the pocket 65 of the rotor 62, As the rotor 62 rotates, it is transferred to the delivery port 66 side. On the other hand, pressurized air is introduced from a pressurized air supply source (not shown) into the pocket 65 communicating with the pressurized air inlet 67. As a result, the granular material P4 received in the pocket 65 is put on the pressurized air passing through the pocket 65 when the pocket 65 does not communicate with the pressure feeding chamber 50 and communicates with the delivery port 66 at the lower end. It is sent out to the outside via 66. Although most of the pressurized air is sent with the powder particles, the rotor pocket 65 after the powder particles are sent is circulated to the pressure feeding chamber side by the rotation of the rotor 62. Some leakage into the pumping chamber 50 occurs.

  When the amount of stored powder P3 in the pressure feeding chamber 50 is reduced as shown in FIG. 7A due to such external delivery, and the low level state is detected by the low level detecting means 51, the state shown in FIG. As shown in the figure, the second on-off valve 40 is opened for a predetermined time while the first on-off valve 20 is closed, and the stored granular material in the intermediate chamber 30 is supplied to the pumping chamber 50 by dropping. At this time, a part of the pressurized air leaking into the pressure feeding chamber 50 slightly leaks into the intermediate chamber 30.

  When there is an opening / closing operation of the second opening / closing valve 40, as shown in FIG. 7 (c), in this example, the first opening / closing valve 20 is closed for a predetermined time with the second opening / closing valve 40 closed. Opened, the pressurized air in the intermediate chamber 30 is sent into the storage chamber 11 and exhausted to the outside of the apparatus through the exhaust filter 14. At this time, since the granular material P1 in the storage chamber 11 is stored in the measuring container 90, the pressurized air passing through the storage chamber 11 hardly acts. Therefore, in the apparatus of the present invention, it is difficult for a situation in which the pressure air is appropriately exhausted and the powder particles flow backward.

  Next, as shown in FIG. 7 (d), with the second on-off valve 40 closed, the first on-off valve 20 is opened and the measured granular material stored in the measuring container 90 is discharged to the middle. An intermediate chamber supply operation for supplying the chamber 30 is performed. Subsequently, as shown in FIG. 7 (e), with the first on-off valve 20 closed, the acceptance of the powder particles from the outside into the measuring container 90 is started, and the weighing by the load cell 13 is performed. A predetermined amount of powder particles are received in the container 90 (measuring container replenishment operation). These replenishing operations may be alternately repeated a plurality of times as necessary when the amount of replenishment at one time is designed to be small.

  Therefore, in this case, the volume, the low level position, the replenishment amount, etc. of the pressure feed chamber 50 are appropriately designed so that the replenishment to the intermediate chamber 30 is completed before the granular material in the pressure feed chamber 50 reaches the low level. To do. In other words, the place where the shortest supply time to the intermediate chamber 30 is equal to the time until the storage amount of the pumping chamber 50 reaches the low level is the maximum pumping capacity of this apparatus. However, it is sufficient that at least the first on-off valve 20 is closed in this measuring container supply operation. Therefore, when the storage amount of the pressure feeding chamber 50 becomes low level (or becomes) during this operation, in parallel. It is also possible to open the second on-off valve 40 and perform the pressure feeding chamber supply operation.

  Thus, during the external pumping of the powder particles, a predetermined amount of the powder particles is always stored in the intermediate chamber 30 and the measuring container 90, and the powder particles are supplied stepwise toward the pumping chamber 50 as necessary. Is done. Thereafter, this is repeated.

And the following advantages are brought about in the granular material pressure feed apparatus of this invention comprised in this way.
(A) Since the granular material is pumped through the measuring container 90 (indicated by reference numeral 12 in the first and second embodiments) and the measuring means 13, the management record of the used amount of the granular material is easy and Can be done accurately.
(B) Since it is not necessary to store a large amount of powder particles in the apparatus, the apparatus can be downsized. Even if it does in this way, since it uses the large-sized storage apparatus which stores a granular material except the case of a small-scale construction, there is no problem in practical use.
(C) The air pressure in the apparatus is appropriately exhausted at an appropriate valve opening / closing timing according to the above-described procedure, and the backflow of the granular material is difficult to occur.
(D) In the present invention, since the solidification material supply path is only shut off at intervals by the two on-off valves 20 and 40, the structure is very simple and maintenance such as internal cleaning is very easy. .

It is a longitudinal cross-sectional view of the 1st form of the granular material pressure supply apparatus which concerns on this invention. It is a longitudinal cross-sectional view from another direction of a 1st form. It is a longitudinal cross-sectional view of the 2nd form of the granular material pressure feed supply apparatus which concerns on this invention. It is a longitudinal cross-sectional view from another direction of a 2nd form. It is a longitudinal cross-sectional view of the 3rd form of the granular material pressure supply apparatus which concerns on this invention. It is a longitudinal cross-sectional view of the 4th form of the granular material pressure feed supply apparatus which concerns on this invention. It is a longitudinal cross-sectional view of the 4th form of the granular material pressure feed supply apparatus which concerns on this invention. It is a principal part enlarged view which shows the operation | movement point of the granular material pressure feed supply apparatus which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Granules measurement supply means, 11 ... Storage chamber, 12 ... Measuring container, 13 ... Load cell, 14 ... Exhaust filter, 20 ... 1st on-off valve, 30 ... Intermediate | middle chamber, 40 ... 2nd on-off valve, 50 ... pressure feeding chamber, 51 ... low level detection means, 60 ... external delivery means.

Claims (1)

A storage chamber having a powder supply port at the top and a discharge port at the lower end, and a powder chamber that is provided in the storage chamber, receives and stores the powder from the outside via the powder supply port. A powder metering supply means having a measuring container configured to discharge the powdery substance into the storage chamber and a measuring means for measuring the amount of the powdery substance in the measuring container;
An intermediate chamber connected to the lower end discharge port of the storage chamber via a first on-off valve and having a discharge port at the lower end;
A pumping chamber connected to the lower end outlet of the intermediate chamber via a second on-off valve;
A predetermined amount of powder and granules stored in the pressure feeding chamber are continuously taken out, and are sent out to the outside by being put on the pressurized air,
Comprising a low level detecting means for detecting a low level state in which the amount of stored granular material in the pumping chamber does not reach a predetermined low level;
At the time of the powder supply operation to the outside, while continuously operating the delivery means to perform continuous quantitative delivery to the outside,
When the low level state is detected by the low level detection means, the second on-off valve is opened with the first on-off valve closed, and the granular material in the intermediate chamber is supplied to the pressure feed chamber. Then, the first on-off valve is opened with the second on-off valve closed, and the pressure air in the intermediate chamber is sent into the storage chamber and exhausted to the outside through the exhaust filter. In addition, the intermediate chamber replenishing operation for discharging the granular material stored in the measuring container and supplying it to the intermediate chamber, and at least the first on-off valve being closed, is placed inside the measuring container from the outside. Configured to perform a weighing container supply operation that accepts a fixed amount of powder,
A granular material pressure feeding device characterized by that.

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