Silo storage temperature measuring cable

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 temperature measuring cable for stored goods in a silo that measures the temperature inside a silo for storing grains and the like, and prevents the tip of a plastic coating material for protecting the outer circumference of the temperature measuring cable from stretching and falling over time during use and becoming foreign matter in the stored goods.

Background Art

[0002] In a silo for storing grains, coal, etc., it is important to measure the temperature of the stored goods inside the silo. When the stored goods in the silo are flammable substances as described above, it is necessary to detect spontaneous ignition in the storage warehouse or to maintain the storage temperature in the case of grains. For temperature measurement, there is a method of attaching a temperature sensor to the side wall inside the silo, but it can only measure the temperature around the stored goods and cannot measure the temperature at the center of the stored goods. Therefore, in the case of grains, it is insufficient to detect spoilage due to condensation caused by the temperature difference with the inner wall of the silo or deterioration of quality due to high temperature.

[0003] Also, in a storage silo for grains, coal, etc., usually, the goods to be stored are put into the silo from the inlet at the upper part of the silo, and the stored goods are taken out of the silo from the outlet at the lower part of the silo using gravity. Therefore, a tensile force is applied to the temperature measuring cable installed for measuring the temperature of the stored goods inside the silo from top to bottom due to friction with the stored goods.

[0004] In Patent Document 1, a silo temperature measuring cable for measuring the temperature of stored goods from the upper part of the silo is suspended inside the silo. A number of temperature sensors are attached to this suspended silo temperature measuring cable, and it is possible to measure the temperature of the stored goods inside the silo.

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

[0006] [Patent Document 1] JITZEN No. 57-46835 [Patent Document 2] Japanese Patent Publication No. 2014-145653 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The temperature-measuring cable described in Patent Document 1 has a problem in that the tip of the plastic protective covering on the outer circumference of the temperature-measuring cable stretches and falls off over time, becoming a foreign object in stored goods. To solve this problem, the applicant devised an invention described in Patent Document 2 that provides a circuit to detect the stretching of the covering tip before it stretches, breaks, and falls off over time. However, this only detects the stretching before the covering tip falls off, and does not prevent the stretching itself. If stretching that could cause the cable to fall is detected, it was necessary to retrieve the temperature-measuring cable in question and replace it with a new one.

[0008] Therefore, the present invention provides a temperature-measuring cable in which a protective covering is positioned at the tip of the temperature-measuring cable to catch the lower end of the covering material. By providing a protective covering at the tip of the temperature-measuring cable, it is possible to prevent the covering material from stretching when it comes into contact with the stored material during discharge from the silo. As a result, since the tip of the covering material can be prevented from falling, it is not necessary to provide a circuit to detect the stretching of the covering material, the frequency of temperature-measuring cable replacement can be reduced, and the effort and cost of replacement can be saved. [Means for solving the problem]

[0009] In order to solve the problems related to measuring devices described above, the present invention, as the first invention, A long structural core made of metal, A long wire including a temperature sensor is wound around the aforementioned structural core, A long plastic covering material protects the outer circumference of the aforementioned wire, A covering material fall prevention part is provided at the lower end of the structural core and is positioned to receive the lower end of the covering material, The present invention provides a temperature-measuring cable for silo-stored goods.

[0010] As a second invention, based on the first invention, The aforementioned protective covering is a cylindrical metal structure that is crimped to the lower end of the structural core, providing a temperature-measuring cable for stored items inside the silo. [Effects of the Invention]

[0011] In the silo storage temperature measuring cable of the present invention having the above configuration, a covering material fall prevention part is provided at the tip of the temperature measuring cable to receive the lower end of the covering material, thereby preventing the covering material from stretching when it comes into contact with the stored material during discharge from the silo. As a result, the tip of the covering material can be prevented from falling, the frequency of replacing the temperature measuring cable can be reduced, and the effort and cost of replacement can be saved. [Brief explanation of the drawing]

[0012] The numbers in brackets [] following the brief description of each figure indicate the main paragraph number of the figure description or the explanation using the figure. [Figure 1] Overall configuration diagram of the silo temperature measurement system using the silo storage temperature measurement cable of the present invention [0033, 0046-0048, 0051] [Figure 2] Figure [0017-0045] shows a schematic example of the temperature measuring cable for silo storage according to the present invention. [Figure 3] Example of temperature measuring instrument hardware configuration for a silo temperature measurement system using the silo storage temperature measuring cable of the present invention [0051-0056] [Figure 4] Configuration example for explaining the temperature measurement cable for stored items in the silo of Embodiment 1 [0026, 0033, 0037 - 0038, 0041 - 0042]

Mode for Carrying Out the Invention

[0013] <Regarding the terms used in the present invention>

[0014] In the present specification, "association" is used in a sense that includes not only the case where two or more pieces of information are directly associated, but also the case where two or more pieces of information are indirectly associated through one or more other pieces of information. Indirect association is not necessarily limited to association within one device (a device with a single housing), and also includes cases where association is made across a plurality of devices.

[0015] "Based on" includes both the case of relying on the object itself and the case of relying on the object after some processing has been done to the object. For example, "acquiring temperature based on a calibration curve and a resistance value" may mean acquiring "temperature" using the "resistance value" obtained by measurement itself with the "calibration curve", or acquiring "temperature" using the "calibration curve" for a value obtained by substituting the "resistance value" obtained by measurement into a mathematical formula.

[0016] <Outline of Embodiment 1> Mainly Claim 1 The temperature measurement cable for stored items in the silo of Embodiment 1 is configured to have a coating material drop prevention part arranged to receive the lower end of a coating material made of plastic at the lower end of a structural core constituting the cable.

[0017] <Functional configuration of Embodiment 1> Fig. 2 shows a schematic configuration diagram of the temperature measurement cable for stored items in the silo of Embodiment 1. The temperature measurement cable for stored items in the silo of Embodiment 1 (0201) has a structural core (0202), a wire material (0203), a coating material (0204), and a coating material drop prevention part (0205).

[0018] Note that the above schematic structure is an example for implementing the present invention, and its structure may be appropriately omitted or a new structure may be added within the range not conflicting with the problems to be overcome by the present invention and its effects. The same applies to the descriptions after Embodiment 1.

[0019] <Description of the Configuration of Embodiment 1> The configuration of the temperature measurement cable for the stored material in the silo will be described below with reference to FIGS. 2 and FIG. 4. <Structural Core (0202) of Embodiment 1> The "structural core" (0202) is long and is configured to be made of metal.

[0020] "Long" refers to a case where the ratio of the length to the diameter of the temperature measurement cable for the stored material in the silo is 1000 times or more. Specific examples of the length, that is, the order of the length, are 10 m or 50 m according to the height of the silo. The same applies to the wire material and the coating material described later.

[0021] The structural core (0202) may be rod-shaped, but preferably it is a rope-shaped object having flexibility so that its shape can follow when the stored material in the silo moves during the input or output of the stored material in the silo. As the rope-shaped structural core, a wire rope formed by twisting several to several tens of elementary wires made of hard steel wire, stainless steel wire, tungsten wire, titanium wire, etc. with iron as the main material into a single layer or multiple layers, usually 6 wires are twisted around the core wire at a predetermined pitch, is preferably used. The specifications of the wire rope used as the structural core can be appropriately selected according to the location where the temperature is measured.

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

[0023] <(0000115)>The "temperature sensor" can, for example, be a platinum resistance thermometer using platinum wire. In addition to resistance thermometers, a thermocouple, a semiconductor temperature sensor such as a thermistor, or other known means may also be used.

[0024] As shown in Figure 2, the wire is configured to measure the temperature at multiple locations within the silo by having multiple temperature sensors (resistance thermometers). In Figure 2, the temperature sensors (resistance thermometers) are arranged offset to the left, center, and right. When installed by suspending it from the top of the silo using the ring-shaped part on the left, the sensors are arranged offset to measure the temperature distribution at the top, center, and bottom of the silo's stored contents. Although Figure 2 shows a configuration that measures at three locations, it is not limited to three. Any number of resistance thermometers necessary to measure and manage the temperature can be arranged.

[0025] In Figure 2, a common ground potential wire is provided for each wire, separate from the wires on which the resistance thermometers are placed. When measuring the resistance of a resistance thermometer for temperature measurement, the voltage and current between the wire connected to the relevant resistance thermometer and the common ground potential wire are measured to determine the resistance of the resistance thermometer. Known four-wire, three-wire, or two-wire temperature measuring circuits can be used as appropriate to determine the resistance.

[0026] The wire containing the temperature sensor for detecting temperature is wound around the structural core, as shown in the enlarged view of section B in Figure 4 (an enlarged view showing the wire with some of the covering material removed) and the cross-sectional view of section A-A'. When a metal wire rope is used for the structural core, it is preferable to pre-cover the surface of the structural core (at least the area around which the wire is wound) with an insulating material (e.g., rubberized cotton tape) before winding the wire, in order to prevent a short circuit between the temperature sensor connection (e.g., soldering to the wire or crimping 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 measuring element shown in Figure 2 and the common ground potential wire, dummy wiring may be placed between each of the wires as a restraining winding. If there are about three locations for temperature sensors, the number of wires to be wound is about four, so if the number of windings is not increased, gaps will form between the wires, and over time the wires will shift, putting stress on the resistance element connection points and potentially leading to disconnection. By arranging restraining windings, the number of windings of the wire can be reduced, and the wires can be formed so that they are not adjacent to each other and are spaced apart. Also, when increasing the number of temperature sensors, if the number fits within the number of restraining windings, the number of temperature sensors can be increased without changing the specifications of the wire winding process. It is preferable that the dummy restraining windings are not electrically floating but connected to the ground potential. When connecting to the ground potential, the restraining windings may be configured to be connected via a high-resistivity element of about 1 MΩ.

[0028] <Embodiment 1: Covering material (0204)> The "covering material" (0204) is made of long plastic and is configured to protect the outer circumference of the wire.

[0029] The plastic used to form the "covering material" is, for example, polyethylene or polyvinyl chloride. This can be changed as appropriate depending on the silo and the stored goods.

[0030] The covering material may be a pipe-shaped object into which a wire wound around a structural core is inserted. Alternatively, the structural core with the wire wound around it may be inserted into a resin pipe-shaped covering material, and then, for example, the resin of the covering material may be heated and shrunk to make it adhere tightly to the structural core with the wire wound around it. Alternatively, instead of a pipe shape, a strip-shaped object may be formed by wrapping it diagonally around the structural core with the wire wound around it so that the ends overlap. Furthermore, a resin such as polyethylene may be injection molded around the structural core with the wire wound around it.

[0031] By using a covering material, it is possible to prevent stored items from getting caught in the gaps of the wires wound around the structural core, and to prevent the wires from being damaged, such as breaking, due to direct friction between the stored items and the wires when storing or removing items.

[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 receive the lower end of the covering material. The covering material fall prevention part includes not only the ring-shaped (or cylindrical with open ends) covering material fall prevention part that exposes the lower end of the structural core as shown in Figures 2 and 4, but also the 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 cable when it is suspended as shown in Figure 1, using the loop-shaped portion at the left end of the silo storage temperature measuring 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] "To be positioned" means to fix the protective covering to the lower end of the structural core, and a known fixing method can be appropriately selected depending on the material of the protective covering. For example, if the protective covering is made of resin, methods such as injection molding or coating and curing can be used, and if it is made of metal, methods such as crimping, pinning, screwing, riveting, welding to the structural core, brazing / soldering, crimping, and casting can be used. Furthermore, the protective covering that is positioned as described above includes not only ring-shaped parts but also cap-shaped parts that cover 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 by applying 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 may be generated by being scraped off due to friction with the stored material and混入 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 carried out 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 and 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 considering the case where the inner surface of the coating material and the side surface of the structural core are not in close contact and expressing it in an equation, the relationship between the outer diameter diameter (R1) of the structural core, the outer diameter diameter (R2) of the coating material, and the outer diameter 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 Fig. 4), but it may also be elliptical or polygonal. Even if the metal that is crushed when caulking a thick cylindrical metal has a shape with a feather-like shape on at least one side, it is better to avoid it because when taking out the stored material in the silo, the stored material may hit 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 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 covering material fall prevention section is configured to be larger than the outer diameter of the covering material. However, when the silo storage temperature measuring cable is suspended inside the silo, if the stored material is small, such as grain, or if crushed powder from the stored material accumulates at the upper end of the covering material fall prevention section, or if the stored material hits the upper end of the covering material fall prevention section when the stored material is removed from the bottom of the silo, pulling the silo storage temperature measuring cable downwards, it is preferable to have a chamfered shape at the upper end of the covering material fall prevention section, as shown in the schematic configuration diagram of the temperature measuring cable in Embodiment 1 of Figure 4.

[0039] When attaching the insulation fall prevention part to the lower end of the structural core, care should be taken to ensure that no wires are positioned between the structural core and the insulation fall prevention part. This is because there is a possibility that wires may be caught between the structural core and the insulation fall prevention part during installation, potentially causing them to break. Furthermore, when using insulation material on the structural core as shown in the A-A' section of Figure 4, it is preferable not to overlap the insulation fall prevention part and the insulation material on the structural core, as this would weaken the connection between the insulation fall prevention part and the structural core.

[0040] When attaching the protective covering to the lower end of the structural core, the lower end of the protective covering may be overlapped with a portion of the protective covering.

[0041] When the protective covering fall prevention part is formed from metal and crimped to fix it, as in Embodiment 2 described later, it cannot be superimposed on the protective covering due to difficulties during crimping. This is because the crimping may become loose, or cracks may occur in the protective covering due to the superimposition. In such cases, a gap is created between the lower end of the protective covering and the upper end of the protective covering fall prevention part, exposing the structural core. Part C in Figure 4 is the part where the structural core was exposed between the lower end of the protective covering and the upper end of the protective covering fall prevention part after crimping. Since exposed parts such as part C may get caught or adhered to by stored items, it is preferable to cover them with resin or the like. For this reason, exposed parts of the structural core such as part C that come into contact with stored items should be coated by injection molding, for example, with the same type of resin as the protective covering or a resin that has good adhesion to the resin forming the protective covering (part C in Figure 4 is already coated).

[0042] An enlarged view of section D in Figure 4, including section C and the covering material fall prevention section, is shown below Figure 4. The enlarged view of section D is an overview at the top and a cross-sectional view at the bottom. The structural core (or structural core covering film) exposed in the region between the upper end of the covering material fall prevention section provided at the lower end of the structural core and the lower end of the covering material is covered with resin (0407) as described above by a known method such as injection molding. The resin filling the exposed portion may be formed by a method other than injection molding (e.g., coating and curing). Furthermore, the upper end of the resin (0407) may be formed to overlap and rest on 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 overlap and rest on at least a portion of the upper end of the covering material fall prevention section (0405).

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

[0044] The resistance thermometer (0206) is, as described above, a platinum resistance thermometer using, for example, a platinum wire. In addition to resistance thermometers, semiconductor temperature sensors such as thermocouples or thermistors, or other known means may be used.

[0045] <Embodiment 1 Silo Storage Temperature Measurement Cable (0201)> The "silo storage temperature measuring cable" (0201) consists of a structural core for maintaining strength, a wire including a temperature sensor for temperature measurement wound around the structural core, a covering material to protect the outer circumference of the wire, and a covering material fall prevention part provided at the lower end of the structural core to receive elongation of the lower end of the covering material.

[0046] An example of a silo temperature measurement system using a silo storage temperature sensing cable is explained with reference to Figure 1.

[0047] <Embodiment 1: Example using a temperature-measuring cable for silo-stored goods> Figure 1 shows a schematic configuration of a silo temperature measurement system (0100) for measuring the temperature of stored material (0111) inside a silo (0110). For example, grain is stored as the stored material. The grain is put into the silo from the input port at the top of the silo and removed from the output port at the bottom. To manage the temperature of the stored material inside the silo, a silo storage temperature measuring cable (0101) is suspended from the top of the silo in the center. The "×" marks on the temperature measuring cable indicate the locations where platinum resistance thermometers are placed as temperature sensors. In the figure, there are three locations (top, middle, and bottom), but these can be increased or decreased as appropriate. A protective cover (0105) is also provided at the lower end of the temperature measuring cable to prevent the covering material from falling.

[0048] When measuring temperature using a temperature measuring instrument connected to the aforementioned temperature measuring cable, for example, the resistance of the platinum resistance thermometer is measured and acquired by a current-voltage measurement unit (0121) on a calculation board (0120) equipped with a known three-wire temperature circuit, using a common wire between the wire containing the upper platinum resistance thermometer and the ground potential. The temperature is then acquired by a temperature acquisition unit (0123) based on the calibration curve held in a calibration curve holding unit (0122) that holds a calibration curve of the resistance and temperature of the platinum resistance thermometer acquired in advance, and the acquired resistance value 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 their respective temperatures are acquired. The acquired temperatures can be stored chronologically on a server device (0151) via an internet connection (0150), or viewed by workers working in locations away from the silo via a PC (0152). A LAN connection may be used instead of an internet connection (0150).

[0049] <Embodiment 1: Method for manufacturing a temperature measuring cable for silo-stored goods> The manufacturing method for a temperature-measuring cable for silo-stored goods is configured to include the following steps. However, it is not limited to the following steps. In the structural core preparation process, the structural core is made to a predetermined length, and a ring-shaped structure is formed at its upper end. In the wire preparation process, a process is carried out to prepare a wire that includes 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 process, a pipe-shaped covering material is installed on the structural core around which the wire material is wound. In the crimping process for the protective covering material fall prevention section, a metal protective covering material fall prevention section is crimped and fixed to the lower end of the structural core. In the deburring process for the protective covering material fall prevention section, the burrs generated during the crimping process are removed, and the lower end portion of the structural core that protrudes from the protective covering material fall prevention section is removed. In the structural core exposure covering process, the structural core exposed between the lower end of the covering material and the upper end of the covering material fall prevention part is covered by injection molding polyethylene resin.

[0050] <Description of the Hardware in Embodiment 1> The following describes the hardware of the temperature measuring instrument, which is a computer that acquires the temperature by receiving a signal from a temperature sensor when measuring the temperature of stored items inside a silo using a temperature measuring cable. <Embodiment 1: Example of Temperature Measuring Device Configuration>

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

[0052] As shown in Figure 3, the temperature measuring device 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 a USB interface for connecting to a control module, etc. 2 It features C, SPI, etc., and a user interface, and a system bus (thick line in the diagram) for exchanging signals between them. Furthermore, it includes USB, I 2 It is connected to the "processing board" via "C, SPI, etc." and is also connected to the "silo storage temperature measurement cable" via the "processing board".

[0053] The various programs and data (information) stored in non-volatile memory are loaded into main memory upon system startup, and the MPU is configured to sequentially perform calculations using the data by accepting execution instructions.

[0054] Upon startup of this system, various programs and data (information) stored in the non-volatile memory are read, expanded, and stored in the main memory, while simultaneously providing a work area that serves as the working area for those programs. Upon receiving execution instructions, the MPU sequentially performs calculations using the data. Both the main memory and the non-volatile memory are assigned multiple addresses, and programs executed by the MPU can identify and access these addresses to exchange data and perform processing.

[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 retention program. Furthermore, the "main memory" and "non-volatile memory" store measured current and voltage values, resistance values, and calibration curves.

[0056] "MPU" is The calibration curve retention program stored in "main memory" is executed to retain the calibration curve. The resistance value acquisition program stored in "main memory" is executed to obtain the resistance value from the measured current and voltage values. The temperature acquisition program stored in "main memory" is executed, and the temperature is obtained 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 to other PCs or server devices via a LAN interface or internet connection.

[0057] <Effects of Embodiment 1> This embodiment 1 provides a temperature-measuring cable for silo-stored goods, in which a protective covering is positioned at the tip of the temperature-measuring cable to catch the lower end of the covering material. By providing a protective covering at the tip of the temperature-measuring cable, it is possible to prevent the covering material from stretching when it comes into contact with the stored goods during discharge from the silo. Therefore, since the tip of the covering material can be prevented from falling, it is not necessary to provide a circuit to detect the stretching of the covering material, which reduces the frequency of temperature-measuring cable replacement and saves the effort and cost of replacement.

[0058] <Embodiment 2 Overview> Mainly Claim 2 In the silo storage temperature measuring cable of Embodiment 2, which is based on Embodiment 1, the part that prevents the sheathing from falling is configured to be a cylindrical metal structure that is crimped to the lower end of the structural core.

[0059] <Embodiment 2 Functional Configuration> The temperature-measuring cable for silo-stored goods in Embodiment 2, which is based on Embodiment 1, has the same configuration as the temperature-measuring cable for silo-stored goods in Embodiment 1, except for the part that prevents the covering material from falling. The differences are described below.

[0060] <Description of Embodiment 2> Since the configuration of Embodiment 2 is almost the same as that of Embodiment 1, we will use Figure 2, which was used in the description of Embodiment 1, to explain it. <Embodiment 2 Covering material fall prevention part (0205)>

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

[0062] For applications where direct contact between the metal protective covering and the stored items is acceptable, forming the protective covering using a cylindrical metal structure can reduce concerns about the strength of the connection with the structural core and the generation of foreign matter.

[0063] The metal material used for the fall prevention part of the covering material can be appropriately selected from known metals such as aluminum, stainless steel, and copper.

[0064] The cylindrical structure used for crimping to form the part that prevents the covering material from falling does not necessarily have to have a circular cross-sectional shape.

[0065] The cylindrical structure used in the protective covering section may have a cap-like shape with one end closed. A cap shape allows the lower end of the structural core to be formed so that it does not protrude from the lower end of the protective covering section. If, for example, the lower end of a structural core made of wire rope protrudes from the lower end of the protective covering section, the structural core is cut at the lower end of the protective covering section and deburred to prevent the individual metal wires that make up the wire rope from falling off and mixing with the contents stored in the silo.

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

[0067] <5. Effects> In the silo storage temperature measuring cable of the present invention having the above configuration, a covering material fall prevention part is provided at the tip of the temperature measuring cable to receive the lower end of the covering material, thereby preventing the covering material from stretching when it comes into contact with the stored material during discharge from the silo. As a result, since the fall of the tip of the covering material can be prevented, there is no need to provide a circuit to detect the stretching of the covering material, the frequency of temperature measuring cable replacement can be reduced, and the effort and cost of replacement can be saved. [Explanation of symbols]

[0068] Silo storage temperature measurement cable...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 is wound around the aforementioned structural core, A long, cylindrical plastic covering material protects the outer circumference of the wire up to near the lower end of the structural core, A covering material fall prevention part is provided at the lower end of the structural core, positioned to receive the lower end of the covering material, and having a receiving means that protrudes from the covering material by more than the thickness of the covering material at its periphery, A resin that completely covers the exposed structural core between the covering material and the fall prevention part, A temperature-measuring cable for silo-stored goods.

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

3. The silo storage temperature measuring cable according to either Claim 1 or Claim 2, further comprising dummy wiring arranged between the wires, which is wound around a structural core to prevent vertical displacement.

4. The silo storage temperature measuring cable according to claim 1 or claim 2, wherein the upper part of the structural core is folded back to form a loop at the upper end, and the cable further comprises a plurality of fastening members that fasten the area near the upper part of the folded and overlapped structural core.

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