JP2013241244A - Raw material storage/supply device - Google Patents

Abstract

[PROBLEMS] To install a new extrusion molding apparatus at low cost while utilizing a hopper of a raw material storage and supply apparatus already installed in a steelworks and a raw material quantitative cutting apparatus disposed at the lower end of the hopper. .
A raw material storage and supply device includes a hopper that stores a raw material, a first raw material quantitative cutting device, and a second raw material quantitative cutting device. The first raw material quantitative cutting device 3 is disposed at the lower end of the hopper 2, and feeds the raw material 7 from the hopper 2 to the first extrusion molding device 5. The second raw material quantitative cutting device 4 is disposed in the hopper 2 at a position different from the position where the first raw material quantitative cutting device 3 is disposed, and the raw material 7 is secondly extruded from the hopper 2. It sends out to the molding apparatus 6.
[Selection] Figure 1

Description

  The present invention relates to a raw material storage and supply device for storing raw materials such as plastics and supplying the raw materials to a plurality of processing apparatuses, and in particular, a hopper for storing raw materials, and a raw material quantitative cutting device disposed in the hopper And a raw material storage and supply apparatus.

  In the steel industry, waste plastic is used as a reducing material in blast furnaces. Normally, when waste plastic is used in a blast furnace, the waste plastic is made into pellets. Depending on the operating conditions of the blast furnace, there may be used finely pulverized pellets of waste plastic. In order to obtain finely pulverized plastic, the raw material that is waste plastic in the form of pellets is subjected to thermal processing such as melt kneading in an extrusion molding apparatus, for example. The heat-processed plastic (hereinafter referred to as “heat-processed plastic”) is made brittle by the heat-processing, and can be easily pulverized with a pulverizer such as a hammer. By pulverizing this heat-processed plastic, a finely pulverized plastic can be obtained.

  Usually, in a steel mill, a raw material storage and supply device having a hopper for storing raw materials such as waste plastic pellets and a raw material quantitative cutting device disposed in the hopper in order to produce finely pulverized plastic Is installed. An extrusion molding device is installed in the vicinity of the raw material storage and supply device, and a raw material quantitative cutting device is connected to the extrusion molding device. The raw material is supplied from the raw material storage and supply device to the extrusion molding device in a constant amount for a long time to obtain a heat-processed plastic. The heat-processed plastic obtained continuously is pulverized. Here, the raw material includes all raw materials that are the basis of the heat-processed plastic charged into the blast furnace.

  As a raw material storage and supply device, for example, as shown in Patent Document 1, a raw material hopper (hopper) for storing raw materials and a raw material scraper that is integrally provided at the lower end of the residual hopper and scrapes the raw material from the residual hopper. 2. Description of the Related Art A raw material supply device (raw material storage and supply device) having a drum-like gear (a raw material quantitative cutting device) is known.

By the way, in order to increase the production amount of heat-processed plastic and increase the usage amount of waste plastic, the following two measures can be considered.
1. Increase raw material storage and supply equipment and extrusion molding equipment.
2. A new supply port is provided in the raw material quantitative cutting device of the existing raw material storage and supply device, and a new extrusion molding device is connected to the supply port.

  According to the above-mentioned Measure 1, the above-mentioned Measure 1 is not desirable because it is necessary to secure a place for the additional raw material storage / supply device and cost for newly installing the raw material storage / supply device.

  According to the above-mentioned measure 2, there is an advantage that it is not necessary to secure a place for a new raw material storage and supply device, and there is no cost for newly installing the raw material storage and supply device. However, when a new port is provided in the existing raw material quantitative cutting device, there is a restriction that the raw material supply amount in each of the plurality of supply ports is the same. Therefore, a situation occurs in which the amount of raw material supplied to each extrusion molding apparatus cannot be controlled independently.

  Regarding the operation of the extrusion molding apparatus, when the extrusion molding apparatus is started, it enters a steady state through an initial state. In the steady state, the raw material can be heat-processed at a constant amount per unit time. However, in the initial state, the amount of raw material that can be heat-processed is smaller than in the steady state. Therefore, until the extrusion molding apparatus changes from the initial state to the steady state, the raw material supply amount is in the steady state. It is necessary to hold down from the supply amount. However, under the above-described situation where the amount of raw material supplied to the first extrusion molding apparatus and the second extrusion molding apparatus cannot be controlled independently, for example, the second extrusion molding apparatus in a steady state is used. There arises a problem that it is difficult to properly operate the first extrusion molding apparatus in the initial state while appropriately operating.

Japanese Utility Model Publication No. 62-128329

  The present invention has been made in view of the above problems, and the object of the present invention is a hopper included in a raw material storage and supply device already installed in an ironworks, and a raw material quantitative cutout disposed at the lower end of the hopper. And installing a new extrusion molding apparatus at low cost.

The gist of the present invention for solving the above problems is as follows.
(1) A raw material storage and supply device that stores raw materials and supplies the raw materials to a plurality of processing devices, the hopper storing the raw materials, and disposed at a lower end of the hopper, A first raw material quantitative cutting device fed from the hopper to the first processing device and a position different from a position where the first raw material quantitative cutting device is disposed; A raw material storage and supply device comprising: a second raw material quantitative cutout device that sends the raw material from the hopper to the second processing device.
(2) In the above (1), the second raw material quantitative cutting device is disposed on a side surface of the hopper which is lower than a storage height of the raw material stored in the hopper. The raw material storage and supply apparatus described.
(3) The second raw material quantitative cutting device is a columnar screw feeder, and the screw feeder is inserted into the hopper from a side surface, and the outer wall portion of the screw feeder is inside the hopper. The raw material storage and supply apparatus according to (2) above, which is open toward the upper end of the hopper.
(4) The raw material storage and supply device according to (1), wherein the second raw material quantitative cutting device is disposed at a lower end of the hopper.

  In the raw material storage and supply device according to the present invention, the second raw material quantitative cutting device is disposed in the same hopper at a position different from the first raw material quantitative cutting device disposed at the lower end of the hopper. Yes. Therefore, since the raw material storage and supply device has two raw material quantitative cutting devices connected to one hopper at different positions, the first raw material quantitative cutting device and the second raw material quantitative cutting device It becomes possible to control the supply amount of each raw material independently.

  Moreover, since it becomes possible to add the second raw material quantitative cutting device while using the hopper of the raw material storage and supply device already installed, it is necessary to secure a place for newly installing the hopper. In addition, it will be possible to reduce capital investment for new hoppers. Therefore, it is possible to improve the production efficiency of the heat-processed plastic while reducing the cost of adding an extrusion molding apparatus.

It is the schematic of the raw material storage supply apparatus which concerns on 1st Embodiment of this invention. It is an arrow view of the II-II line cross section in FIG. It is the schematic of the raw material storage supply apparatus which concerns on 2nd Embodiment of this invention.

<First Embodiment>
FIG. 1 is a schematic view of a raw material storage and supply apparatus according to the first embodiment of the present invention. With reference to FIG. 1, the raw material storage supply apparatus which concerns on 1st Embodiment is demonstrated concretely. The raw material storage and supply device 1 includes a hopper 2, a first raw material quantitative cutting device 3 disposed at the lower end of the hopper 2, and a position where the first raw material quantitative cutting device 3 is disposed. And a second raw material quantitative cutting device 4 disposed in the hopper 2 at a different position. A first extrusion molding device (first processing device) 5 is connected to the first raw material quantitative cutting device 3, and a second extrusion molding device is connected to the second raw material quantitative cutting device 4. (Second processing device) 6 is connected. The raw material storage and supply device 1 supplies the raw material 7 to the plurality of processing devices 5 and 6.

  The hopper 2 has a hollow cylindrical shape and can store the raw material 7. A loading conveyor 11 for conveying the raw material 7 is connected to the upper portion of the hopper 2. This input conveyor 11 conveys the raw material 7 and inputs the raw material 7 from the upper part of the hopper 2. The charged raw material 7 is accumulated and stored inside the hopper 2.

  The height (storage height) of the raw material 7 stored in the hopper 2, that is, the height from the lower end of the hopper 2 to the upper surface of the raw material 7 stacked in the hopper 2 (storage height) is detected. A detection device (not shown) is provided in the hopper 2. The storage height is determined by the upper surface of the stacked raw materials 7 that are in contact with the inner peripheral surface of the hopper 2.

  In response to a height-related signal from a detection device (not shown), the raw material input amount control device 12 sends a signal to the input conveyor 11 so that the storage height is a predetermined height from the lower end of the hopper 2, The operation of the loading conveyor 11 is controlled. When the detection device detects that the raw material 7 has accumulated to a predetermined height in the hopper 2, the raw material input amount control device 12 that has received the detection signal stops the input operation of the raw material 7. 11 is controlled. On the other hand, the input conveyor 11 continues to input the raw material 7 until stopped by the raw material input amount control device 12. The predetermined height is a height at which the raw material 7 can be stored so as not to overflow from the upper end of the hopper 2. As the predetermined height, the maximum height from the lower end to the upper end of the hopper 2 can be adopted. Usually, for example, a height of 95 from the lower end to the upper end is taken into consideration. %.

  The first raw material quantitative cutting device 3 is disposed at the lower end of the hopper 2 and communicates with the hopper 2 through a discharge port of the hopper 2 provided at the lower end. The first raw material quantitative cutting device 3 is also connected to a first extrusion molding device 5. The first raw material quantitative cutting device 3 receives the stored raw material 7 from the hopper 2 through the discharge port, and supplies a predetermined amount of the raw material 7 to the first extrusion molding device 5. Specifically, an apparatus called a table feeder can be adopted as the first raw material quantitative cutting apparatus 3 (see Japanese Patent Application Laid-Open No. 2005-213001).

  The amount of the raw material 7 supplied by the first raw material quantitative cutting device 3 is determined by the amount of the raw material 7 to be heat processed by the first extrusion molding device 5. The first extrusion molding device 5 is provided with a detection device (not shown) that detects the amount of the raw material 7 to be thermally processed per unit time. A signal relating to the amount of heat processing performed by the first extrusion molding device 5 is transmitted to the control device of the device 3, and the control device of the first raw material quantitative cutting device 3 supplies the supply amount of the raw material 7 based on the signal. Adjust.

  Of the configuration of the raw material storage and supply device 1 according to the first embodiment, the hopper 2 and the first raw material quantitative cutting device 3 are existing devices in an ironworks. Since it is preferable to discharge the raw material 7 from the discharge port provided at the lower end of the hopper 2 to the first raw material quantitative cutting device 3 by gravity, only the first raw material quantitative cutting device 3 is integrated with the hopper 2. Therefore, it is arranged at the lower end. Due to the structure of this existing apparatus, the first raw material quantitative cutting apparatus 3 occupies the vicinity of the lower end of the hopper 2. For this reason, the added second raw material quantitative cutting device 4 cannot be arranged at the lower end of the hopper 2. Therefore, the second raw material quantitative cutting device 4 is disposed in the hopper 2 at a position different from the position where the first raw material quantitative cutting device 3 is disposed.

  The second raw material quantitative cutting device 4 is preferably attached to the side surface of the hopper 2 that is lower than the storage height, and the raw material 7 is preferably cut out from the hopper 2 by the second raw material quantitative cutting device 4. FIG. 2 is an arrow view of the cross section taken along the line II-II in FIG. 1 and is a view of the inside of the hopper 2 as viewed downward from the cross section taken along the line II-II. The 2nd raw material fixed quantity cutting device 4 is inserted and fixed to the inside of hopper 2 from the side.

  The shape of the second raw material quantitative cutting device 4 is preferably a columnar screw feeder having a screw 13 for conveying the raw material 7 as shown in FIGS. 1 and 2. The raw material 7 placed on the screw 13 is conveyed out of the hopper 2 by the rotation of the screw. In addition, if the shape of the 2nd raw material fixed quantity cutting-out apparatus 4 can supply the raw material 7 to the extrusion molding apparatus 6 of a fixed amount next process and can be connected to the side surface of the hopper 2, FIG. And it is not limited to the column shape as shown in FIG.

  As shown in FIG. 2, inside the hopper 2, a part of the outer wall (outer wall portion) of the second raw material quantitative cutting device 4 opens toward the upper end of the hopper 2, and the second raw material quantitative cutting device The screw 13 inside the dispensing device 4 is exposed upward. For this reason, when the raw material 7 is thrown into the inside of the hopper 2 from the upper end, the raw material 7 is likely to be placed on the screw 13.

  Similarly to the first raw material quantitative cutting device 3, the supply amount of the raw material 7 is also determined by the amount of heat processing performed by the second extrusion molding device 6 in the second raw material quantitative cutting device 4. Similar to the first raw material quantitative cutting device 3 and the first extrusion molding device 5, the second extrusion molding device 6 is provided with a detection device for detecting the amount of the raw material 7 to be thermally processed per unit time. And based on the signal of this detection apparatus, the rotation speed of the screw 13 may be controlled and the supply amount of the raw material 7 may be adjusted.

  Alternatively, in the second raw material quantitative cutting device 4, since the supply amount of the raw material 7 is determined by the rotational speed of the screw 13, the relationship between the rotational speed of the screw 13 and the supply amount of the raw material 7 is calibrated in advance. The desired supply amount of the raw material 7 may be supplied by adjusting the rotation number of the screw 13 based on the relationship between the rotation number and the supply amount based on the calibration.

  The first extrusion molding device 5 and the second extrusion molding device 6 have the same structure, and a known plastic molding machine can be employed. The first extrusion molding device 5 has a first extrusion die 14 and a first cutter 15. Inside the first extrusion molding device 5, the supplied raw material 7 is melt-kneaded. The molten plastic obtained by melt-kneading is injected from the first extrusion die 14 so as to become a string-shaped molten plastic, and then the injected string-shaped molten plastic is cut by the first cutter 15. A cylindrical heat-processed plastic 16 is manufactured. Similarly to the first extrusion molding device 5, the second extrusion molding device 6 includes a second extrusion die 17 and a second cutter 18, and manufactures a cylindrical heat-processed plastic 16.

  As described above, since the plurality of raw material quantitative cutting devices, the first raw material quantitative cutting device 3 and the second raw material quantitative cutting device 4, are connected to one hopper 2 at different positions, The supply amount can be controlled independently by each of the first and second raw material quantitative cutting devices 3 and 4. Even when a new extrusion molding apparatus is newly installed, the hopper 2 of the raw material storage and supply apparatus 1 that has already been installed can be used.

Second Embodiment
FIG. 3 is a schematic view of a raw material storage and supply apparatus according to the second embodiment of the present invention. In the raw material storage and supply device 21 according to the second embodiment, the description of the same configuration as the raw material storage and supply device of the first embodiment is omitted. In the second embodiment, as shown in FIG. 3, unlike the configuration of the raw material storage and supply device 1 according to the first embodiment, the first raw material quantitative cutting device 23 and the second raw material quantitative cutting device 24 are The lower end of the hopper 22 is disposed independently and in parallel.

  Although the second raw material quantitative cutting device 24 is connected to the lower end of the hopper 22, the second raw material quantitative cutting device 24 is connected to the hopper 22 at a position different from the position where the first raw material quantitative cutting device 23 is connected to the hopper 22. It is connected. Therefore, each of the first raw material quantitative cutting device 23 and the second raw material quantitative cutting device 24 is supplied independently, and the raw material 7 from the hopper 22 is fed into the first extrusion molding device 5 and the second extrusion molding device. It is possible to supply to each of the molding apparatus 6.

  Usually, a raw material storage and supply device comprising one raw material quantitative cutting device for one hopper and having the raw material quantitative cutting device disposed on the entire lower end of the hopper has been used in steelworks. When the raw material storage and supply device 21 shown in the second embodiment in which the two raw material quantitative cutting devices 23 and 24 are arranged in parallel to the lower end of the hopper 22 is newly installed in the steelworks, the first It is necessary to design the shape and structure of the second raw material quantitative cutting devices 23 and 24 and the hopper 22. Both the first and second raw material quantitative cutting devices 23 and 24 have a shape and a structure that can be juxtaposed to the lower end of the hopper 22, and a certain amount of the raw material 7 is supplied to the first and second raw materials 7 and 24. If it can send out to the extrusion molding apparatuses 5 and 6, the shape and structure are not particularly limited. Specifically, a table feeder can be used as the first and second raw material quantitative cutting devices 23 and 24.

  In addition, in the existing raw material storage and supply apparatus in which only one raw material quantitative cutting device is provided at the lower end of one hopper as shown in FIG. It is also possible to redesign the raw material storage and supply device so that the raw material quantitative cutting device is removed from the hopper and two raw material quantitative cutting devices are arranged in parallel to the lower end of the hopper. is there.

  As described above, a plurality of raw material quantitative cutting devices, the first raw material quantitative cutting device and the second raw material quantitative cutting device, are connected to one hopper. The amount can be controlled independently.

DESCRIPTION OF SYMBOLS 1 Raw material storage supply apparatus 2 Hopper 3 1st raw material fixed quantity cutting apparatus 4 2nd raw material fixed quantity cutting apparatus 5 1st extrusion molding apparatus 6 2nd extrusion molding apparatus 7 Raw material 11 Input conveyor 12 Raw material input amount control apparatus DESCRIPTION OF SYMBOLS 13 Screw 14 1st extrusion die 15 1st cutter 16 Heat processing plastic 17 2nd extrusion die 18 2nd cutter 21 Raw material storage supply apparatus 22 Hopper 23 1st raw material fixed quantity cutting device 24 2nd raw material fixed quantity Cutting device

Claims (4)

A raw material storage and supply device for storing raw materials and supplying the raw materials to a plurality of processing devices,
A hopper for storing the raw material;
A first raw material quantitative cutting device that is disposed at a lower end of the hopper and feeds the raw material from the hopper to the first processing device;
A second raw material quantitative cutting device that is disposed in the hopper at a position different from the position where the first raw material quantitative cutting device is disposed, and that feeds the raw material from the hopper to the second processing device. And a raw material storage and supply device.   2. The raw material storage according to claim 1, wherein the second raw material quantitative cutting device is disposed on a side surface of the hopper which is equal to or lower than a storage height of the raw material stored in the hopper. Feeding device. The second raw material quantitative cutting device is a columnar screw feeder,
The screw feeder is inserted into the hopper from a side surface, and an outer wall portion of the screw feeder is opened toward the upper end of the hopper inside the hopper. Raw material storage supply equipment.   The raw material storage and supply device according to claim 1, wherein the second raw material quantitative cutting device is disposed at a lower end of the hopper.

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