Temperature measurement cable for stored object in silo

Abstract

To solve the problems that, although a temperature measurement cable used to measure a temperature of a stored object in a silo is covered with a coating material to prevent the cable from coming into direct contact with the stored object, the coating material can expand due to friction force or the like when the stored object is removed, causing the vicinity of an expanded lower end to break and fragments to be mixed into the stored object, and that when expansion of the coating material is detected, the temperature measurement cable itself needs to be replaced.MEANS FOR SOLVING THE PROBLEM: By providing a coating material fall prevention part at a tip of a temperature measurement cable for a stored object in a silo to receive a lower end of the coating material, it is possible to prevent the coating material from expanding when it comes into contact with the stored object when the stored object in the silo is discharged. As a result, it is possible to prevent the tip part of the coating material from falling, reduce a frequency with which the temperature measurement cable needs to be replaced, and save the effort and cost of replacement.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a silo storage temperature measuring cable that measures the temperature inside a silo that stores grains or the like, and that prevents the tip of the plastic covering that protects the outer periphery of the temperature measuring cable from stretching and falling off over time and becoming a foreign object in the stored items. [Background technology]

[0002] In silos used to store grain, coal, and other materials, it is important to measure the temperature of the stored materials inside the silo. When the stored materials inside the silo are combustible materials, this is necessary to detect spontaneous combustion within the storage facility, and in the case of grain, to maintain storage temperatures. One method for measuring temperature is to attach a temperature sensor to the side wall of the silo, but this only measures the temperature around the stored material, not the center of the material. Therefore, in the case of grain, this method is insufficient to detect spoilage due to condensation caused by the temperature difference with the silo wall, or deterioration in quality due to high temperatures.

[0003] Furthermore, in silos for storing grain, coal, etc., the items to be stored are usually loaded into the silo through an inlet at the top, and then removed from the silo through an outlet at the bottom using gravity. As a result, the temperature measurement cable installed to measure the temperature of the items stored in the silo is subjected to a pulling force from top to bottom due to friction with the stored items.

[0004] In Patent Document 1, a silo temperature measuring cable is hung down from the top of the silo inside the silo to measure the temperature of the stored items. This hanging silo temperature measuring cable is equipped with a number of temperature sensors, making it possible to measure the temperature of the stored items inside the silo.

[0005] Patent Document 2 discloses a detection means for preventing the tip of the plastic covering material used to protect the outer periphery of the temperature measuring cable in Patent Document 1 from stretching over time due to friction with the stored items, causing the covering material near the stretched tip to break and fall, and preventing the fallen tip and fragments of the covering material from becoming foreign matter in the stored items. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Jitsuzen Showa 57-46835 [Patent Document 2] Patent Publication No. 2014-145653 Summary of the Invention [Problem to be solved by the invention]

[0007] The temperature measuring cable of the invention described in Patent Document 1 has a problem in that the tip of the plastic covering that protects the outer periphery of the temperature measuring cable stretches over time and falls off, becoming a foreign object in stored items. To solve this problem, the applicant devised an invention described in Patent Document 2, which provides a circuit to detect stretching before the tip of the covering stretches over time, breaks, and falls off. However, this only detects the tip of the covering before it falls off, and does not prevent the stretching itself. If stretch that could result in falling is detected, the temperature measuring cable in question must be recalled and replaced with a new one.

[0008] Therefore, the present invention provides a temperature measuring cable with a coating material drop prevention part at the tip of the temperature measuring cable that receives the lower end of the coating material. By providing a coating material drop prevention part at the tip of the temperature measuring cable, it is possible to prevent the coating material from stretching when it comes into contact with the stored material when it is discharged from the silo. This prevents the tip of the coating material from falling, eliminating the need for a circuit to detect the stretching of the coating material, reducing the frequency of temperature measuring cable replacement and saving the effort and cost of replacement. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems related to the measuring device, the present application provides, as a first invention, a long structural core made of metal; a long wire including a temperature sensor wound around the structural core; a long plastic covering material that protects the outer periphery of the wire; a covering material drop prevention part provided at a lower end of the structural core and arranged to receive a lower end of the covering material; The present invention provides a silo storage temperature measuring cable comprising:

[0010] As a second invention, based on the first invention, The covering material drop prevention part provides a silo storage material temperature measurement cable, which is a metallic tubular structure that is crimped to the lower end of the structural core. [Effects of the Invention]

[0011] In the silo storage temperature measuring cable of the present invention having the above-mentioned configuration, a coating material drop prevention part is provided at the tip of the temperature measuring cable to receive the lower end of the coating material, thereby preventing the coating material from stretching when it comes into contact with the stored material when the stored material is discharged from the silo. This prevents the tip of the coating material from dropping, reduces the frequency of replacing the temperature measuring cable, and saves the effort and cost of replacement. [Brief explanation of the drawings]

[0012] The numbers in brackets [ ] after the brief description of each figure indicate the main paragraph numbers of the figure description or the description using the figure. [Figure 1] Overall configuration diagram of a silo temperature measurement system using the silo storage temperature measurement cable of the present invention [0033, 0046-0048, 0051] [Figure 2] [0017-0045] A diagram showing an example of the schematic configuration of a silo storage temperature measurement cable according to the present invention. [Figure 3] Hardware configuration example of a temperature measuring device for a silo temperature measuring system using the silo storage temperature measuring cable of the present invention [0051-0056] [Figure 4] Configuration examples [0026, 0033, 0037-0038, 0041-0042] for explaining the silo storage temperature measuring cable of embodiment 1 DETAILED DESCRIPTION OF THE INVENTION

[0013] <Terminology used in the present invention>

[0014] The term "association" is used herein to mean not only a case where two or more pieces of information are directly associated, but also a case where two or more pieces of information are indirectly associated via one or more other pieces of information. Indirect association is not necessarily limited to association within one device (a device with a single housing), but also includes association across multiple devices.

[0015] "Based on" includes both cases where it is based on the object itself and cases where it is based on the object after some processing has been performed. For example, "obtaining temperature based on a calibration curve and resistance value" means that the "temperature" can be obtained by using the "calibration curve" to obtain the "resistance value" obtained by measurement, or the "temperature" can be obtained by putting the "resistance value" obtained by measurement into a mathematical formula and using the "calibration curve" to obtain the value.

[0016] <Outline of Embodiment 1> Mainly claim 1 The silo storage material temperature measuring cable of embodiment 1 is configured to have a coating material fall prevention part that is arranged to receive the lower end of the plastic coating material at the lower end of the structural core that constitutes the cable.

[0017] <Functional Configuration of Embodiment 1> Figure 2 shows a schematic diagram of the silo storage temperature measurement cable of embodiment 1. The silo storage temperature measurement cable (0201) of embodiment 1 has a structural core (0202), wire (0203), coating material (0204), and coating material fall prevention part (0205).

[0018] The above-described schematic structure is merely an example for carrying out the present invention, and parts of the structure may be omitted or new parts may be added as appropriate within the scope of the problems to be overcome by the present invention and the effects thereof. The same applies to the explanations of the first embodiment and subsequent embodiments.

[0019] <Configuration of Embodiment 1> The configuration of the silo storage temperature measurement cable is explained below using Figures 2 and 4. <Embodiment 1 Structural core (0202)> The "structural core" (0202) is long and is made of metal.

[0020] "Long length" refers to a cable whose length is 1000 times or more the diameter of the cable used to measure the temperature of stored materials in a silo. A specific example of a long length is on the order of 10m or 50m, which corresponds to the height of the silo. This "long length" also applies to the wire and covering materials described below.

[0021] The structural core (0202) may be rod-shaped, but is preferably rope-shaped, having flexibility so that it can follow the shape of the silo when the stored material moves when it is put into or taken out of the silo. As the rope-shaped structural core, it is preferable to use a wire rope formed by twisting together strands of several to several tens of wires made of iron-based hard steel wire, stainless steel wire, tungsten wire, titanium wire, etc. in a single layer or multiple layers, usually six wires twisted together around a core rope at a predetermined pitch. The specifications of the wire rope used as the structural core can be selected appropriately depending on the location where the temperature is to be measured.

[0022] <Embodiment 1 Wire Rod (0203)> The "wire" (0203) is long and is configured to include a temperature sensor wound around the structural core.

[0023] The "temperature sensor" may be, for example, a platinum resistance thermometer using a platinum wire. Alternatively, a thermocouple, a semiconductor temperature sensor such as a thermistor, or other known means may be used instead of a resistance thermometer.

[0024] As shown in Figure 2, the wire is configured to have multiple temperature sensors (resistance thermometers) so that it can measure the temperature of multiple locations on the items stored in the silo. In Figure 2, the temperature sensors (resistance thermometers) are offset to the left, center, and right. When the wire is installed so that it is suspended from the top of the silo using the ring-shaped part on the left, it is offset to measure the temperature distribution at the top, center, bottom, etc. of the items stored in the silo. Although Figure 2 shows a configuration for measuring three locations, this is not limited to three. Any number of resistance thermometers can be placed to measure and manage the temperature.

[0025] In Figure 2, a common wire with a ground potential is placed in addition to the wires on which the resistance thermometers are placed. When measuring the resistance of a resistance thermometer for temperature measurement, the resistance of the resistance thermometer is determined by measuring the voltage and current between the wire connected to the corresponding resistance thermometer and the common wire with the ground potential. To determine the resistance, a known four-wire temperature measurement circuit, three-wire temperature measurement circuit, or two-wire temperature measurement circuit can be used as appropriate.

[0026] The wire containing the temperature sensor that detects the temperature is wound around the structural core as shown in the enlarged view of part B in Figure 4 (an enlarged view showing the wire with part of the coating removed) and the cross-sectional view of part A-A'. When a metal wire rope is used for the structural core, it is preferable to coat the surface of the structural core (at least the area around which the wire will be wound) with an insulating material (e.g., rubberized cotton tape) before winding the wire, to prevent a short circuit between the joint of the temperature sensor (e.g., soldered to the wire or crimped with an aluminum crimp sleeve) and the structural core.

[0027] Furthermore, when winding the wire around the structural core, in addition to the wire connected to the resistance sensor and the common ground potential wire shown in Figure 2, dummy wires may be placed between each of the wires as a pressure winding. If there are three or so temperature sensors, the number of wires to be wound is approximately four. Therefore, if the number of windings is not increased, gaps may form between the wires, causing the wires to shift over time and exerting force on the resistor element connections, potentially leading to wire breakage. By placing pressure windings, the number of windings can be reduced and the wires can be spaced apart without being adjacent to each other. Furthermore, if the number of temperature sensors is increased within the number of pressure windings, it is possible to add more temperature sensors without changing the specifications of the wire winding process. It is preferable that the dummy pressure windings be connected to ground potential rather than electrically floating. When connecting to ground potential, the pressure windings may be configured to be connected via a high-resistance element of approximately 1 MΩ.

[0028] <Embodiment 1 Coating Material (0204)> The "covering material" (0204) is made of a long piece of plastic and is configured to protect the outer periphery of the wire.

[0029] The plastic that forms the "covering material" is, for example, polyethylene or polyvinyl chloride. It can be changed appropriately depending on the silo and the stored material to be used.

[0030] The covering material may be a pipe-shaped material into which a structural core wound with wire is inserted. The structural core wound with wire may be inserted into a resin pipe-shaped covering material, and then, for example, the resin of the covering material may be heated to cause thermal shrinkage, thereby adhering it to the structural core wound with wire. Alternatively, instead of a pipe-shaped material, a strip-shaped material may be wrapped diagonally around the structural core wound with wire so that the ends overlap. Furthermore, a resin such as polyethylene may be injection molded around the structural core wound with wire.

[0031] By providing the covering material, it is possible to prevent stored items from being caught in gaps between the wires wound around the structural core, and to prevent the wires from being broken or damaged due to direct friction between the stored items and the wires when the stored items are put in or taken out.

[0032] <Embodiment 1 Covering material fall prevention part (0205)> The "covering material fall prevention part" (0205) is provided at the lower end of the structural core and is configured to be positioned so as to receive the lower end of the covering material. The covering material fall prevention part includes not only the ring-shaped (or cylindrical with both ends open) covering material fall prevention part that exposes the lower end of the structural core as shown in Figures 2 and 4, but also a cap-shaped covering material fall prevention part that covers the lower end of the structural core.

[0033] The "lower end of the structural core" refers to the lower end of the silo storage temperature measurement cable when it is suspended as shown in Figure 1 using the loop-shaped part at the left end of the silo storage temperature measurement cable shown in Figure 2 or Figure 4. In Figure 2 or Figure 4, this corresponds to the right end of the structural core.

[0034] "Disposed" means that the coating material drop prevention part is fixed to the lower end of the structural core, and a known fixing method can be selected appropriately depending on the material of the coating material drop prevention part. For example, if the coating material drop prevention part is made of resin, methods such as injection molding or coating hardening can be used, and if it is made of metal, methods such as caulking, pinning, screwing, riveting, welding to the structural core, brazing / soldering, crimping, and casting can be used. Furthermore, the coating material drop prevention part disposed as described above includes not only a ring-shaped part but also a cap-shaped part that covers the lower end of the structural core.

[0035] The coating material falling prevention part can be formed, for example, by caulking a cylindrical member made of metal under pressure, or by injection molding resin at the lower end of the structural core. In the case of metal, it can be appropriately selected and used from known metals such as aluminum, iron, and stainless steel. Since there is a possibility that burrs that could not be completely removed during manufacturing may detach, or foreign substances shaved off by friction with the stored material may occur and mix into the stored material, it is preferable to appropriately select metal or resin for the material forming the coating material falling prevention part depending on the stored material. When forming with resin, it can be done by injection molding polyethylene, vinyl chloride, etc. at the lower end of the structural core, or appropriately selected from other known resin materials and formed by an appropriate method.

[0036] The coating material falling prevention part is configured to have a thickness equal to or greater than the thickness of the coating material in order to receive the lower end of the coating material so that the coating material does not fall. Preferably, it is desirable that the outer diameter of the coating material falling prevention agent is greater than twice the thickness of the coating material in the initial state next to the outer diameter of the coating material. Regarding the coating material, it is a state where the coating material falling prevention part protrudes further by the thickness of the coating material. If we also consider the case where the inner surface of the coating material and the side surface of the structural core are not in close contact and express it in an equation, the relationship between the outer diameter (R1) of the structural core, the outer diameter (R2) of the coating material, and the outer diameter (R3) of the coating material falling prevention part is preferably (R2 - R1)+R2 < R3.

[0037] In the description in this specification and the drawings, the cross-sectional shape of the coating material falling prevention part corresponding to the cross-sectional direction of the temperature measuring cable is assumed to be circular (see Figure 4), but it may also be elliptical or polygonal. The metal that has been crushed when caulking a thick cylindrical metal may have a shape with a feather-like shape on at least one side, but it is better to avoid it because when taking out the stored material in the silo, the stored material may hit it and receive a downward pulling force, or receive a force that twists the temperature measuring cable. When the cross-section is not circular, the outer diameter of the circle inscribed in the cross-section is taken as R3 in the above equation.

[0038] As described above, the outer diameter of the coating material fall prevention part is configured to be larger than the outer diameter of the coating material, but in order to prevent small stored items such as grains from accumulating at the upper end of the coating material fall prevention part when the silo storage item temperature measurement cable is hung inside the silo, or to prevent the stored items from hitting the upper end of the coating material fall prevention part and pulling the silo storage item temperature measurement cable downward when the stored items are removed from the bottom of the silo, it is preferable to make the upper end of the coating material fall prevention part chamfered, as shown in the schematic configuration diagram of the temperature measurement cable of embodiment 1 in Figure 4.

[0039] When attaching the sheathing drop prevention part to the bottom of the structural core, care must be taken to ensure that no wire is positioned between the structural core and the sheathing drop prevention part. This is because there is a risk of the wire being pinched between the structural core and the sheathing drop prevention part during installation, resulting in a break. Furthermore, when using structural core sheathing, as shown in the A-A' cross section of Figure 4, overlapping the sheathing drop prevention part and the structural core sheathing weakens the bond between the sheathing drop prevention part and the structural core, so it is preferable not to overlap the two.

[0040] When the covering material fall prevention part is attached to the lower end of the structural core, the lower end of the covering material may be overlapped with a part of the covering material fall prevention part.

[0041] When the covering material drop prevention part is made of metal and secured by crimping, as in the second embodiment described below, it cannot overlap the covering material due to the crimping problem. This is because the crimping may become loose or the overlapping may cause cracks in the covering material. In such a case, a gap may form between the bottom end of the covering material and the top end of the covering material drop prevention part, exposing the structural core. Part C in Figure 4 shows the exposed portion of the structural core between the bottom end of the covering material and the top end of the covering material drop prevention part after crimping. Exposed parts such as part C may be subject to the risk of stored items becoming trapped or adhering, so they are preferably covered with a resin or other suitable material. Therefore, exposed parts of the structural core such as part C that come into contact with stored items can be injection-molded with a resin similar to the covering material or a resin with good adhesion to the resin forming the covering material to fill the exposed part (part C in Figure 4 is already covered).

[0042] An enlarged view of part D in Figure 4, including part C in Figure 4 and the covering material drop prevention part, is shown at the bottom of Figure 4. In the enlarged view of part D, the upper part is a general view, and the lower part is a cross-sectional view. As described above, the structural core (or structural core covering film) exposed in the area between the upper end of the covering material drop prevention part provided at the lower end of the structural core and the lower end of the covering material is covered with resin (0407) using a known method such as injection molding. Note that the resin filling the exposed area may be formed using methods other than injection molding (e.g., coating and curing). Furthermore, the upper end of the resin (0407) may be formed to ride up and overlap at least a portion of the lower end of the covering material (0404). Similarly, the lower end of the resin (0407) may be formed to ride up and overlap at least a portion of the upper end of the covering material drop prevention part (0405).

[0043] <Embodiment 1: Resistance temperature detector (0206)> The "resistance temperature detector" (0206) is configured to be disposed as a temperature sensor included in the wire in order to electrically measure the temperature of the stored items in the silo.

[0044] The resistance temperature detector (0206) is a platinum resistance temperature detector using a platinum wire, as described above. In addition to the resistance temperature detector, a thermocouple, a semiconductor temperature sensor such as a thermistor, or other known means may also be used.

[0045] <Embodiment 1: Silo storage temperature measurement cable (0201)> The "Silo Storage Temperature Measuring Cable" (0201) is composed of a structural core to maintain strength, a wire including a temperature sensor for temperature measurement wound around the structural core, a covering material to protect the outer periphery of the wire, and a covering material drop prevention part that is provided at the lower end of the structural core and receives the stretch of the lower end of the covering material.

[0046] An example of a silo temperature measurement system using a silo storage temperature measurement cable will be explained with reference to FIG.

[0047] <Embodiment 1: Example using a silo storage temperature measurement cable> FIG. 1 is a diagram showing the schematic configuration of a silo temperature measurement system (0100) that measures the temperature of stored material (0111) in a silo (0110). For example, grain is stored as stored material. Grain is loaded into the silo through an inlet at the top of the silo and removed and transported through an outlet at the bottom. To manage the temperature of the stored material in the silo, a silo stored material temperature measurement cable (0101) is suspended from the top of the silo in the center. The "x" marks on the temperature measurement cable indicate the locations where platinum resistance thermometers are installed as temperature sensors. In the figure, there are three locations (top, middle, and bottom), but this number can be increased or decreased as needed. In addition, a coating material fall prevention section (0105) is installed at the bottom end of the temperature measurement cable.

[0048] When measuring temperature using a temperature measuring device connected to the temperature measuring cable, the resistance of the platinum resistance thermometer is measured and acquired using, for example, the wire containing the upper platinum resistance thermometer and a common wire at ground potential using a current / voltage measuring unit (0121) on a calculation board (0120) equipped with a known three-wire temperature circuit. The temperature is then acquired by a temperature acquisition unit (0123) based on the resistance value of the platinum resistance thermometer acquired and a calibration curve stored in a calibration curve storage unit (0122) that stores a previously acquired calibration curve of the resistance and temperature of the platinum resistance thermometer. The acquired temperature is displayed on a display device (0154). The resistance of the central and lower platinum resistance thermometers is measured in the same way as the upper platinum resistance thermometer, and the respective temperatures are acquired. The acquired temperatures can be stored in chronological order in a server device (0151) via an Internet line (0150), or can be viewed by a worker working away from the silo via a PC (0152). Note that a LAN line may be used instead of the Internet line (0150).

[0049] <Embodiment 1: Method for manufacturing a silo storage temperature measuring cable> The manufacturing method of the silo storage temperature measuring cable is configured to include the following steps, but is not limited to the following steps. In the structural core preparation process, the structural core is cut to a predetermined length and a ring-shaped structure is formed at the upper end. In the wire preparation step, a process is performed to prepare a wire including a temperature sensor to be wound around the structural core, In the wire winding process, the prepared wire is wound around the structural core, In the covering material installation step, a pipe-shaped covering material is installed on the structural core around which the wire is wound, In the process of crimping the covering material fall prevention part, a process is carried out to crimp and fix the metal covering material fall prevention part to the bottom end of the structural core, In the deburring process of the covering material drop prevention part, burrs generated during the crimping are removed, and the lower end part of the structural core protruding from the covering material drop prevention part is removed. In the structural core exposed portion covering process, the structural core exposed between the lower end of the covering material and the upper end of the covering material fall prevention portion is covered by injection molding polyethylene resin.

[0050] <Embodiment 1: Description of Hardware> The following describes the hardware of the temperature measuring device, which is a computer that acquires the temperature by receiving a signal from a temperature sensor when measuring the temperature using a temperature measuring cable for stored materials in a silo. <Embodiment 1: Example of the configuration of a temperature measuring device>

[0051] FIG. 3 is a conceptual diagram showing an example of the hardware configuration of a temperature measuring device, which is a computer connected to the temperature measuring cable of the present invention shown in FIG. 1. The hardware configuration of the temperature measuring device of the present invention will be explained using FIG. 3, taking as an example a configuration similar to that of an embedded system (a configuration similar to that of a PC is also possible). Since FIG. 3 is a diagram for explaining the hardware configuration, descriptions of individual programs and data are omitted. Note that the hardware of the computer portion of the device of the present invention may be configured similar to that of a known PC. When a server device as shown in FIG. 1 is used in a system for measuring temperature using the silo storage temperature measuring cable of the present invention, the server device may be configured similar to that of a known PC.

[0052] As shown in Figure 3, the temperature measuring instrument consists of an MPU, non-volatile memory (e.g., ROM, SSD, HDD, flash memory, etc.), main memory (e.g., DRAM, SRAM, etc.), a LAN I / F (I / F: interface) for connecting to a control PC or recorder, and an interface for connecting to a control module, etc., called a USB, I 2 It also has a system bus (thick line in the diagram) for sending and receiving signals between them. 2 C, SPI, etc., and is also connected to the "Calculation Board" via the "Calculation Board" to the "Temperature Measurement Cable for Materials Stored in the Silo."

[0053] When the system is started, the various programs and data (information) stored in the non-volatile memory are expanded into the main memory, and upon receiving an execution command, the MPU sequentially executes the programs and performs calculations using the data.

[0054] When this system starts up, the various programs and data (information) stored in the non-volatile memory are read, expanded, and stored in the main memory, which also provides a work area for those programs. By accepting execution commands, the MPU sequentially performs calculations using the data in the programs. Note that multiple addresses are assigned to the main memory and non-volatile memory, and programs executed by the MPU can exchange data between them and perform processing by identifying and accessing those addresses.

[0055] In this embodiment, the programs stored in the "main memory" are a resistance value acquisition program, a temperature acquisition program, and a calibration curve storage program. The "main memory" and the "non-volatile memory" also store measured current and voltage values, resistance values, calibration curves, etc.

[0056] "MPU" is A calibration curve storage program stored in the "main memory" is executed to store the calibration curve. The resistance value acquisition program stored in the "main memory" is executed to acquire the resistance value from the measured current and voltage values. A temperature acquisition program stored in the "main memory" is executed to acquire the temperature based on the acquired resistance value and the stored calibration curve. The acquired temperature can be output to a display device via USB, I2C, SPI, etc., or via LAN I / F to another PC or server device via a LAN line or Internet line.

[0057] <Effects of the First Embodiment> The silo storage temperature measuring cable of this embodiment 1 provides a temperature measuring cable in which a coating material fall prevention part is arranged at the tip of the temperature measuring cable so as to receive the lower end of the coating material. By providing a coating material fall prevention part at the tip of the temperature measuring cable, it is possible to prevent the coating material from stretching when it comes into contact with the stored material when it is discharged from the silo. This prevents the tip of the coating material from falling, eliminating the need to provide a circuit to detect the stretching of the coating material, reducing the frequency of temperature measuring cable replacement and saving the effort and cost of replacement.

[0058] <Outline of Embodiment 2> Mainly claim 2 In the silo storage material temperature measuring cable of embodiment 2 based on embodiment 1, the coating material drop prevention part is configured as a metallic tubular structure that is crimped to the lower end of the structural core.

[0059] <Functional Configuration of Second Embodiment> The silo storage temperature measuring cable of the second embodiment, which is based on the first embodiment, has the same configuration as the silo storage temperature measuring cable of the first embodiment except for the coating material drop prevention part. The differences will be explained below.

[0060] <Configuration of Second Embodiment> The configuration of the second embodiment is almost the same as that of the first embodiment, and therefore will be described using FIG. 2, which was used in the description of the first embodiment. <Embodiment 2 Covering material fall prevention part (0205)>

[0061] The "covering material fall prevention part" (0205) is configured as a metallic cylindrical structure that is crimped to the lower end of the structural core.

[0062] For applications where direct contact of the metal coating material fall prevention part with the stored material is permitted, forming the coating material fall prevention part using a metal cylindrical structure can reduce the bonding strength with the structural core and the risk of foreign matter generation.

[0063] The metal material used for the covering material drop prevention portion can be appropriately selected from known metals such as aluminum, stainless steel, copper, etc.

[0064] The cylindrical structure to be crimped to form the coating material drop prevention portion does not have to have a circular cross-sectional shape.

[0065] The cylindrical structure used in the sheathing fall prevention unit may be in the form of a cap with one end closed. The cap shape can be formed so that the bottom end of the structural core does not protrude from the bottom end of the sheathing fall prevention unit. If the bottom end of the structural core, for example, made of a wire rope, protrudes from the bottom end of the sheathing fall prevention unit, the structural core is cut at the bottom end of the sheathing fall prevention unit and deburred or otherwise processed to prevent the individual metal wires that make up the wire rope from falling out and becoming mixed with the contents stored in the silo.

[0066] <Effects of the Second Embodiment> In embodiment 2, in addition to the effects of embodiment 1, the coating material fall prevention section is formed by crimping a metal tubular structure to the lower end of the structural core, thereby increasing the bonding strength with the structural core and reducing the risk of foreign matter generation.

[0067] <5. Effects> In the silo storage temperature measuring cable of the present invention having the above configuration, a coating material drop prevention part is provided at the tip of the temperature measuring cable to receive the lower end of the coating material, thereby preventing the coating material from stretching when it comes into contact with the stored material when it is discharged from the silo. This prevents the tip of the coating material from falling, eliminating the need for a circuit to detect the stretching of the coating material, reducing the frequency of temperature measuring cable replacement and saving the effort and cost of replacement. [Explanation of symbols]

[0068] Temperature measurement cable for stored materials in silos···0201 Structural core 0202 Wire rod 0203 Covering material 0204 Covering material fall prevention section...0205

Claims

1. a long structural core made of metal; a long wire including a temperature sensor wound around the structural core; a long plastic covering material that protects the outer periphery of the wire; a covering material drop prevention part provided at a lower end of the structural core and arranged to receive a lower end of the covering material; A temperature measurement cable for materials stored in a silo.

2. 2. The silo storage temperature measuring cable according to claim 1, wherein the covering material drop prevention portion is a metallic cylindrical structure that is crimped to the lower end of the structural core.

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