JPS62138179A - Device for detecting material temperature in extrusion of food and method for controlling material temperature - Google Patents

Abstract

PURPOSE:To enable measurement of temperature in high precision without causing stagnation and turbulence of material to be extruded, by using a temperature sensor having a channel to pass the material to be extruded, placing the sensor between a cylinder and a die and placing another sensor out of the extrusion channel directing toward the screw. CONSTITUTION:A temperature sensor 18 having a passing channel 11a of extrusion material is placed between a food extrusion die 4 and an extrusion cylinder 1 containing a screw 2 and the sensor is fixed with an adapter 3 and a die connector 10. Another temperature sensor 19 having a form of thin rod is protruded along a direction parallel and opposite to the flowing direction of the extrusion material (the direction of the screw 2) into a cavity other than the passing channel 11a of the first temperature sensor 18.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a detection device and method incorporated into an extruder to measure the temperature of the material during extrusion processing of various food materials. Regarding improvements.

(Prior Art) As a food extruder for extruding various foods to obtain a desired extruded shape and content, a screw cylinder type as illustrated in FIG. 9 is generally used. That is, in the same figure, there is a food material supply hopper (not shown) at one end.
A screw 2 is rotatably installed concentrically in the cylinder 1, and an adapter 3 is connected to the front end of the cylinder 1 on the extrusion side, and a die plate 4 is connected to the front end of the adapter 3.
The molding die 5 is set concentrically through jj7. As a result, the food material is extruded in a mixed line shape by the screw 2, rectified by the adapter 3, and continuously extruded by the forming die 5 while being formed into a desired cross-sectional shape. At this time, as shown in the figure, a heating device 9 is attached to each necessary part along with a thermocouple 8 for temperature adjustment.
However, the required heating and temperature control is performed via a temperature controller. To detect and measure the temperature of the processed material during extrusion processing of such food materials, conventionally, as shown in the figure, a measuring device is used that penetrates into the material flow path at a suitable position on the circumferential side of the cylinder 1 or on the circumferential side of the adapter 3. The temperature of the material is measured by drilling a hole, inserting a temperature sensor 6 into the hole, and bringing the flowing +A material into contact with the temperature measurement point 7 at the tip of the sensor 6. That's what I'm doing.

(Problems to be Solved by the Invention) The conventional detection and measurement techniques described above have problems in the following points. In Fig. 9, in the type in which the temperature detector 6 is installed in the cylinder 1, the temperature measurement point 7 of the detector 6 can only be brought out to the same plane as the inner diameter surface of the cylinder because the screw 2 is inside. ,
It has the disadvantage that it is only possible to measure the material temperature near the cylinder wall, which means that the measurement is far from accurate. In addition, in the case of the type in which the temperature sensor 6 is installed in the adapter 3, the temperature measurement point 7 can be made to protrude into the material flow path by a distance of l as shown in the figure, and the temperature measurement point 7 can be structurally connected to the structure such as the screw 2. Since there are no 5
When the tip protrudes into the material flow path, a material retention area a is created around the detection part, as shown in FIG. 10 (1), and this further progresses. As shown in Figure (2), the layer of material has developed into a solid layer a' that covers the temperature measurement point 7, which is the detection end, making it virtually difficult to actually measure the temperature of the flowing material. It will become. Furthermore, with this conventional means, it is difficult to perform measurements at multiple different points in the cross section of the flow path, which has a large negative effect on the material flow path. Taking these points together, in the conventional technology, since the detection end is close to the wall surrounding the material flow path, the material flow tends to stagnate and is easily affected by the temperature of the metal wall itself, making it difficult for the material to actually flow. It is virtually impossible to know or measure the exact temperature of the material itself. In addition, if the detection end is extended away from the wall surface (protruding), there will be problems with strength due to flow resistance of the material. Therefore, if the detection part is made larger in diameter, it will interfere with the smooth flow of the material and increase in road resistance,
Increased stagnation and turbulence in the flow path inevitably occur, resulting in inconveniences such as a decrease in detection accuracy and responsiveness. In addition, from the above points, it becomes even more difficult to simultaneously measure the material temperature at multiple locations within the flow path, resulting in a shortage of necessary data.

In particular, in this type of temperature measurement, the temperature distribution at each point on a plane perpendicular to the material flow path and its changes over time (
Although it is essential to measure the presence or absence of material temperature fluctuations in the extrusion direction, it is difficult to satisfy this requirement.

(Means for Solving the Problems) The present invention solves the problems of the prior art as described above, such as stagnation of the material flow in the material temperature detection section, disturbance of the flow state, and furthermore, the problem of the metal wall side temperature. In addition, the temperature distribution and fluctuations of the fluid material, and changes over time in the cross section perpendicular to the flow path and in the extrusion direction, can be avoided.
It is capable of measuring with high accuracy, and specifically, it is installed at the connection part between the cylinder equipped with a screw and the molding die in a food extruder, or at the material passage within the molding die.
Moreover, a thin rod-shaped temperature sensor for measuring the material temperature is provided in the measuring body equipped with a material passage in a protruding manner in a direction parallel to and opposite to the flow direction of the material. The purpose of this method is to use a perforated plate whose round holes serve as material passages, or a device consisting of an arbitrary number of girders connected to the outer frame at multiple points inside an annular outer frame. Equipped with heating and cooling equipment,
The purpose of this is to enable temperature control of the measurement body independently or in synchronization with the temperature of the material being measured by the temperature sensor.
Furthermore, a thin rod-shaped temperature sensor is fixed to the measurement body via a heat insulating material, and the annular outer frame of the measurement body consisting of an annular outer frame and a girder is extended from the temperature measurement point of the temperature measurement sensor; n. The purpose is to make it protrude outward.

(Function) According to the technical means of the present invention, as shown in FIGS. 1 and 2, the adapter 3 is attached to the open end of the cylinder 1 equipped with the screw 12 in an extruder, and A detection device 17 according to the present invention is sandwiched between the adapter 3 and the die connector 10, and a molding die is attached to the front end of the die connector 10 via the die plate 1-4. 5 is installed.

In the present invention, the material temperature detection device 17 includes a measurement body 18 which is clamped and fixed by the adapter 3 and the die connector 10 as shown in the figure, and a thin rod-shaped temperature sensor 19 held by the measurement body 18. and the temperature sensor 19 is parallel to the flow direction of the material extruded from the cylinder 1 side via the screw 2,
In addition, it is provided in a protruding manner from the measuring body 18 in a direction facing the material, and in the illustrated example, as the measuring body 18,
A concentric annular outer frame 20 is fitted and held by the adapter 3 and the die connector 10, and both ends thereof are integrated with the inner peripheral surface of the outer frame 20, and the outer frame 20 has a vertical cross section perpendicular to the central axis of the extruder. By using the structure with the girder 21, as shown in FIG.
forming a material passageway 22.22 surrounded by both sides of the
A thin rod-shaped temperature sensor 19 using, for example, a thermocouple or a thermistor is inserted into the insertion hole drilled across the outer frame 20 and the girder 21 to embed it, and the sensor 19 is bent from the required position. By protruding from the girder 21 in the direction and attitude described above, one end of the sensor 19 is connected to the annular outer frame 20.
In combination with the fact that it is brought out of the insertion hole from the outer circumferential surface and connected to a required measuring and regulating device such as a temperature indicator or a temperature controller (not shown) via the lead wire 23, the following effects occur. That is, as the extruder operates, the food material is transferred from the front end of the cylinder 1 to the material passage in the adapter 3, to the annular outer frame 20, and further to the die connector 10 through kneading and extrusion by the rotation of the screw 12. The material is continuously extruded into a desired cross-sectional shape by a forming die 5 through a material passageway. The temperature sensor 19 in the shape of a thin rod included in the detection device 17 is parallel to the flow direction of the material flowing toward the die side in the material passage of the adapter 3 as shown in the figure, and is opposed to the flow direction. The temperature measurement point [6] at the tip of the sensor 19 is completely inside the material and in contact with the material, so it can reliably capture the material temperature and measure its temperature. Measurements can be made. According to the detection device 17 of the present invention, the device itself is integrated with the extruder side and an independent unit, and the sensor measures the temperature by directly embedding this unit in the material flow path of the extruder. 19 can be disposed in parallel to the material flow direction in the material flow path, thereby minimizing material flow resistance and making the sensor 19 have a small diameter rod shape, reducing stagnation, resistance, and does not cause flow turbulence, and combined with the fact that the temperature measurement point 16 can be projected directly opposite the material flow, the material temperature can be directly sensed, improving temperature measurement response and measurement accuracy. At the same time, the extrusion of the material in the extruder is not inhibited at all. Furthermore, since the device 17 is composed of the measurement body 18 and the temperature sensor 19, the temperature measurement sensor 19 can be held securely and firmly, and by forming the material passage 22 in the measurement body 18, it is possible to This does not impede the flow, and in particular, a plurality of temperature sensors 19 can be used as shown in the example. For example, one sensor 19 is placed above the extrusion center, another one is placed closer to the wall surface of the adapter 3, and the remaining sensor 19 is placed at an intermediate point between the two. Measurement contents such as the state of temperature distribution at each point on a perpendicular plane in the flow path of a fluid material and the state of its change over time can be freely and arbitrarily designed.
This makes it easier to obtain more abundant and accurate temperature data, and since it is an independent unit, this detection device 17 (extruder side and German 1'1: i,
It is possible to provide a heating and cooling device 7, more preferably insulated from the extruder side, and to perform independent temperature control on the entire device according to the desired or measurement purpose. Therefore, it is possible to obtain more accurate temperature measurement contents, and it becomes possible to easily detect and measure the accurate temperature of the material itself that is actually flowing inside the extruder.

(Example) Detection device i according to the present invention: Appropriate l of 17 (Each example is
This will be explained sequentially in FIG. 1 and below.

Embodiment 1 shown in FIGS. 1 and 2, measurement body 1
8 and a temperature measuring sensor 19, the measuring body 18 is constructed of an annular outer frame 20 and a girder 21, and is a cylinder incorporating a screen 12. Opening 111i of 1: The die connector 10 is attached to the adapter 3 fixed with Ii>iii using, for example, bolt fastening means (=j), and the annular notch 3a provided on the opposing surfaces of the adapter 3 and the die connector 10, 10a
As a result, the annular outer frame 20 as the measuring body 18 of the detection device 17 is fitted and assembled. Annular outer frame 20
is an annular shape concentric with the adapter 3 and the die connector 10, and its inner circumferential surface is flush with the inner surface of both the above-mentioned 3 and 10, passing through the center of this annular outer frame 20, and perpendicular to the axis of the extruder. The girder 21 is formed such that both ends thereof are integrated with the outer frame 20. At this time, the cross-sectional shape of the reclamation 21 is A-
As is clear from the cross-sectional view taken along line A, the cross-sectional shape of the channel is, for example, teardrop-shaped, to reduce material flow resistance and further prevent material from stagnation. Further, from the outer peripheral surface of the annular outer frame 20 to the surface of the girder 21 facing the cylinder 1 side, approximately I,
In the illustrated example, three shaped insertion holes lh are drilled, and in each of these various holes 18a, a small diameter rod-shaped temperature sensor 19 such as a thermocouple or ZARISTA is embedded in a seed coat, and one end is inserted. protrudes outside the outer circumferential surface of the outer frame 20, and the other end protrudes from the surface of the girder 21 facing the cylinder 1 side in a direction that corresponds to the flow direction of the material and is opposed to the flow. In the illustrated example, three sensors 19 are shown, but the number and arrangement of the temperature sensors 19 (in addition to 17 locations) are freely determined. It is connected to a temperature measuring meter or a temperature regulating meter (not shown).Therefore, in this embodiment, the space formed between the inner circumferential surface of the annular outer frame 20 and the girder 21 is the material passage 22.
2. A molding die 5 is attached to the die connector 10 via die plates 1 and 4.

The embodiment shown in FIG. 3 uses a porous plate 11 as the measurement body 18 in the detection device 17, and the same reference numerals as in the embodiment in FIG. 1.2 indicate the same members. Annular notch 3a of adapter 3 and die connector 10
, 10a, a plurality of round holes 11a are arranged in rows on the entire surface of the plate 11, and the outer peripheral portion of the porous brake l-11 is fitted and held therein.
By opening parallel to the material flow direction,
This round hole 11a is used as a material passage. At this time, a predetermined width part at the center passing through the center of the perforated plate 1] and perpendicular to the extrusion center is a non-porous part where the round hole 11a is not formed, and the A-Δ cross section of FIG. 3 shown in FIG. As is clear from the above, an insertion hole 18a is provided in this non-porous portion in the same manner as shown in the embodiment shown in FIG. - It is made to protrude from the surface in a direction parallel to and opposite to the material flow direction, and other than that, the structure may be exactly the same as that of the embodiment shown in FIG. 1.2. Also in this embodiment, the number and measurement positions of temperature sensors 19 can be freely designed. According to this structure, the temperature measurement sensor 19 can be held more firmly, and the measurement body 18 can also be made stronger.

The embodiment shown in FIG. 5 utilizes the fact that the detection device 17 has an independent unit structure, so that the temperature of the device 17 can be controlled independently from the extruder side. In this example, the annular outer frame 20 and girder 2 of the embodiment in FIG.
1, the annular outer frame 20 has the same outer diameter as the adapter 3 and the die connector 10, and both Annular outer frame 2 exposed alongside .10
A heating/cooling device I4 is attached to the outer peripheral surface of the frame 20 in a circular manner, and heat insulation ÷A is provided between the annular outer frame 20 and each joint surface of both the frames 3 and 10.
12 is installed L7 to insulate it from the extruder side, a temperature detection thermocouple 13 for the device 17 is inserted into the annular outer frame 20, and connected to a temperature controller (not shown) via a lead wire 23. This allows the temperature of the detection device 17 itself to be independently controlled. According to this, it is possible to control the detection device 17 to an arbitrary temperature and measure the material temperature as accurately as possible, and also feed back the material temperature actually measured by the temperature sensor 19 on the girder 21 side. Detection device 17
By maintaining the temperature of the material at substantially the same temperature as the material temperature, it is also possible to measure the material temperature more accurately. This temperature control means is similarly used in the embodiments of FIGS. 1-3.

The embodiment shown in FIG. 6 is a structural example for attaching the temperature sensor 19 to the measurement body 18 of the detection device 17, and includes a case where the porous plate 11 is used as the measurement body 18 as shown in the figure. This example shows a porous play)
By integrating the temperature sensor 19 and the measurement body 18 through the heat-insulating +A material 15 or through a structure in which the temperature sensor 19 is wrapped in the same material 15, in the embedded part of the temperature sensor 19 in the temperature sensor 11, Detection device 1
It is also possible to reduce the temperature influence of 7 itself to enable more accurate material temperature measurement, and this structure
Of course, the same can be applied to the measuring body 18 made up of the annular outer frame 20 and the girder 21 in the embodiment shown in FIGS.

The embodiment shown in FIG. 7 is particularly effective in the type of detecting device 17 described in the embodiment in FIG.
The annular outer frame 20 of the measurement main body 18 is placed from the temperature measurement point 16 of the temperature measurement sensor 19 as shown in the figure! 1kuβ2
As shown in the figure, extend the temperature sensor 19 outward and attach it to the outer frame 2.
This improves the stability and accuracy of material temperature measurement, and also helps protect the temperature sensor 19. The same can be applied to the case of the perforated plate 11 in the embodiment shown in FIG.

The embodiment shown in FIG. 8 is a measuring body 18 made up of the annular outer frame 2o and the girder 21 shown in the embodiment of FIG.
This shows a modified example of the girder 21, which can also be shaped into a radial finger shape, such as the cross shape on the left side of the figure, or the Y shape on the right side of the figure. This makes it very easy to freely select and increase the location of the temperature sensor 19.

Each of the above embodiments mainly describes the use of the present invention in extrusion processing of food materials, and the use at any position between an extruder and a molding die or within a molding die, but the purpose and effects of the present invention are It goes without saying that the invention can also be applied to materials other than foods, and to processing equipment other than extruders and molding dies, without departing from the above.

(Effects of the Invention) According to the detection device 17 of the present invention, the material temperature detection section using the temperature sensor 19 is installed opposite to and parallel to the flow direction of the material A, so that the material flow resistance is extremely small.
The sensor 19 can be made into a small diameter rod shape, without causing material retention, resistance, turbulence, etc. in the flow path.
Excellent in speed of temperature measurement response and improvement in measurement accuracy.
Furthermore, since the temperature measurement point 16 of the sensor 19 protrudes opposite the material flow, the material temperature can be sensed directly and reliably, and both responsiveness and accuracy are reliably increased. In addition, the measuring body 18 is also superior in that, unlike the annular outer frame and girder or porous plate, it does not secure a material passage and reduce its flow, and does not impede the smooth extrusion function for temperature measurement. Furthermore, since the detection device 17 is incorporated into the material flow path as an independent unit, the temperature of the device 17 itself is controlled independently to minimize the influence of the temperature of the device itself on the temperature detected by the temperature sensor 19. It is excellent in that the temperature of the device 17 can be controlled appropriately,
Furthermore, by controlling the temperature of the device 17 itself by feeding back the measured material temperature so as to match the detected material temperature (in the case of multi-point temperature measurement, the average representative material temperature is taken), It is also excellent in that it can accurately measure the temperature of the material without being affected by the temperature of surrounding objects, including the temperature of the device itself, and the temperature sensor part is fixed to the measurement body 18 through an insulating material. By doing so, even if there is a large difference between the temperature of the device itself and the temperature of the material, the influence can be reduced, more accurate temperature detection can be obtained, and the film-shaped outer frame 2
By extending 7 from the temperature measurement point 16 position of the temperature measurement sensor 19 and encasing it, it is not only useful to protect the temperature measurement point during storage and work, but also to rectify the flow of material at the temperature measurement sensor portion. For example, restrictions on the shape of the adapter are reduced, making it easier to use.Furthermore, in the case of the independent temperature control type, the +A material layer temperature and temperature measurement thermistor can be adjusted depending on the wall temperature of the extension of the measuring body. By making the wall surface equal to the material temperature, you can reduce the influence of
It is also advantageous in that it is possible to measure the temperature of the A material layer,
This solves the problems of conventional temperature measuring means, which are uncertain and lack stability.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view including the A-A cross section of an embodiment of the device of the present invention, FIG. 2 is a longitudinal sectional side view of the main parts of the device, FIG. The figure is a longitudinal sectional side view of the same main part, Fig. 5 is a longitudinal sectional front view of an embodiment of the present invention device with temperature control, and Fig. 6 is a B-B of an embodiment of the structure of the temperature sensor mounting part.
7 is a longitudinal sectional front view of the main part of an embodiment of the device of the present invention with an extended measuring body; FIG. 8 is a longitudinal sectional side view of an embodiment of the index-shaped structure of the device embodiment of FIG. FIG. 9 is a longitudinal sectional front view showing a conventional device, and FIG. 10 is an enlarged view of the main part of FIG. 1- cylinder, 2- screw, 3- adapter, 4- die plate, 5- forming die, 10- die connector, 17
-detection device, 18-.-measurement body, 19-temperature sensor,
20-Annular outer frame, 21-Girder, 11-Porous plate,]
2-Insulating material, 14-Heating, cooling device, 15-Insulating material.

Claims (7)

[Claims] (1) A small diameter for measuring the temperature of the material is provided in a measuring body equipped with a material passage, which is installed at an arbitrary position in the connecting part between a cylinder equipped with a screw and a molding die in a food extruder, or in a material passage in the molding die. A material temperature detection device for food extrusion processing, characterized in that a rod-shaped temperature sensor is provided in a protruding manner in a direction parallel to and opposite to the material flow direction. (2) The material temperature detection device for food extrusion processing according to claim 1, wherein a porous plate is used as the measuring body, and a large number of round holes in the plate are used as material passages. (3) In the food extrusion process as set forth in claim 1, the measuring body is a body having an arbitrary number of digits connected to the annular outer frame at a plurality of locations inside the annular outer frame. Material temperature detection device. (4) The temperature of the material in food extrusion processing according to claim 1, characterized in that the measuring body is provided with its own heating and cooling device to enable arbitrary temperature control of the measuring body independently. Detection device. (5) A material for food extrusion processing according to claims 1 to 4, characterized in that a thin rod-shaped temperature sensor for measuring material temperature is fixed to the measuring body via a heat insulating material. Temperature detection device. (6) The food according to claim 3, characterized in that the annular outer frame of the measuring body consisting of an annular outer frame and a girder is extended from the temperature measurement point position of the temperature measurement sensor and protrudes outward. Material temperature detection device for extrusion processing. (7) A small diameter for measuring the temperature of the material is provided in the measuring body equipped with the material passage, which is installed at an arbitrary position in the connecting part between the cylinder equipped with the screw and the molding die in the food extruder, or in the material passage in the molding die. A material temperature detection device for food extrusion processing, characterized in that a rod-shaped temperature sensor is provided in a protruding manner in a direction parallel to and opposite to the flow direction of the material, which feeds back the material temperature measured by the temperature sensor. A method for controlling a material temperature detecting device in food extrusion processing, characterized in that the temperature of the measuring body is synchronously controlled to substantially the same temperature as the material temperature.