Mechanical device and temperature management system

Abstract

The mechanical device (20) includes a shaft member (31), a bearing (42) that rotatably supports the shaft member (31), and an RFID tag (33a) that has a temperature sensor (33b) that detects the temperature of the shaft member (31) and transmits the detected temperature of the temperature sensor (33b) to a reader / writer (3).

Description

Technical Field

[0001] This disclosure relates to mechanical devices and temperature management systems. Background Technology

[0002] Patent Document 1 discloses a bearing unit for a conveying device as an example of a mechanical device. The mechanical device of Patent Document 1 includes a housing, a bearing disposed in the housing, a sensor for detecting the condition of the bearing, and a transmitter for wirelessly transmitting information detected by the sensor.

[0003] The bearing, sensor, and transmitter are housed within a housing. The sensor, for example, is a temperature sensor that detects the bearing's temperature. When the bearing's condition changes, its temperature rises, sometimes causing bearing malfunctions. The mechanical device of Patent Document 1 facilitates the detection of bearing malfunctions based on the temperature detected by the temperature sensor.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-11312 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] The mechanical device in Patent Document 1 also includes a cover for the sensor and transmitter inside the housing, as well as a sealing member to prevent dust and other contaminants from entering between the housing and the cover. Thus, because the mechanical device in Patent Document 1 contains sensors and other components inside the housing, the number of parts increases, making it difficult to construct simply. Furthermore, in mechanical devices with shaft members and bearings that rotate relative to each other, it is desirable to detect malfunctions as early as possible. This is also true for mechanical devices with two members capable of relative movement.

[0009] The purpose of this disclosure is to simplify the structure and enable early detection of mechanical malfunctions in a mechanical device having two components capable of relative motion and a temperature management system incorporating the mechanical device.

[0010] Solution for solving the problem

[0011] A mechanical device according to a technical solution disclosed herein comprises: a first component; a second component, wherein the first component is mounted on the second component in a manner capable of relative movement; and an RFID tag having a temperature sensor that detects the temperature of the first component and transmits the detected temperature of the temperature sensor to a reader.

[0012] Therefore, the temperature sensor is positioned on the first component, and the detected temperature is sent to the reader. Thus, the detected temperature can be output with a simple structure. Furthermore, the detected temperature can be output regardless of the sensor's position. Therefore, the structure of the mechanical device can be simplified.

[0013] Furthermore, when the temperature of the first component rises, the dimensional relationship between the first and second components changes. This can sometimes cause anomalies in either the first or second component. Therefore, detecting the temperature of the first component using a temperature sensor can help enable earlier detection of mechanical anomalies based on the temperature of the first component.

[0014] In addition, in a mechanical device of one of the technical solutions disclosed herein, the first component is a shaft component, the second component is a bearing that supports the first component as a rotatable bearing, and the temperature sensor is disposed on the end face of the first component.

[0015] Therefore, even when the mechanical device has a shaft member and supports the shaft member as a rotatable bearing, as described above, the structure of the mechanical device can be simplified, and early detection of mechanical device malfunctions can be achieved based on the temperature of the lead screw shaft.

[0016] Furthermore, when the temperature sensor is positioned on the end face of the shaft member, the centrifugal force acting on the temperature sensor can be reduced compared to when the temperature sensor is positioned on the outer peripheral surface of the shaft member. Therefore, temperature sensor malfunctions can be suppressed.

[0017] Furthermore, in the mechanical device of one of the technical solutions disclosed herein, the first component is a lead screw shaft, the second component is a nut that can be rotatably fitted into the first component, and the temperature sensor is disposed on the end face of the first component.

[0018] Therefore, even when the mechanical device has a lead screw and a nut that can be rotatably fitted onto the lead screw, as described above, the structure of the mechanical device can be simplified, and early detection of mechanical device malfunctions can be achieved based on the temperature of the lead screw.

[0019] Furthermore, when the temperature sensor is positioned on the end face of the lead screw shaft, the centrifugal force acting on the temperature sensor can be reduced compared to when the temperature sensor is positioned on the outer circumferential surface of the lead screw shaft. Therefore, temperature sensor malfunctions can be suppressed.

[0020] In addition, in a mechanical device of one of the technical solutions disclosed herein, there are also a plurality of rolling elements that roll between the first member and the second member. The second member is a guide rail, and the first member is a sliding member mounted on the second member in a manner that allows it to slide relative to the second member. The first member has a circulation path for the rolling elements to circulate. When the first member is viewed in a direction orthogonal to the sliding direction of the first member, the temperature sensor overlaps with the circulation path.

[0021] Therefore, even when the mechanical device has a guide rail and a sliding member that is slidably mounted on the guide rail, as described above, the structure of the mechanical device can be simplified, and it can help to detect abnormalities of the mechanical device at an earlier stage based on the temperature of the sliding member.

[0022] Furthermore, in the sliding component, the temperature of the portion in contact with the rolling element rises earlier than the temperature of other portions. Therefore, the portion of the sliding component with a temperature sensor located on its outer surface rises earlier in tandem with the temperature rise of the sliding component. Thus, the mechanical device can reliably facilitate early detection of anomalies through the temperature detected by the temperature sensor.

[0023] In addition, in a mechanical device of one of the technical solutions disclosed herein, the first component is a lead screw shaft, the second component is a nut that can be rotatably fitted into the first component, and the mechanical device also includes a second RFID tag, which has a second temperature sensor for detecting the temperature of the second component and sends the detected temperature of the second temperature sensor to a reader.

[0024] Therefore, even when the mechanical device has a lead screw and a nut that can be rotatably fitted to the lead screw, as described above, the structure of the mechanical device can be simplified, and early detection of mechanical device malfunctions can be achieved based on the temperature of the lead screw and the temperature of the nut.

[0025] Furthermore, the temperature management system of the present disclosure includes: the mechanical device; the reader / writer; and a control device, wherein the reader / writer is electrically connected to store the detected temperature of the temperature sensor.

[0026] Therefore, the reader can easily obtain the detected temperature from the temperature sensor of the mechanical device. Consequently, the control device can easily obtain the detected temperature from the temperature sensor via the reader. Thus, the temperature management system can achieve early detection of mechanical device malfunctions with a simple structure.

[0027] In addition, the temperature management system of the present disclosure includes a plurality of the aforementioned mechanical devices.

[0028] Therefore, the control device can easily acquire the detected temperatures from multiple temperature sensors via a reader. Thus, even with multiple mechanical devices, the temperature management system can achieve early detection of mechanical malfunctions with a simple structure.

[0029] In addition, in a temperature management system of a technical solution disclosed herein, the first component is a lead screw shaft, the second component is a nut that is rotatably fitted into the first component, the control device controls the rotation of the first component, and corrects the rotation of the first component based on the detection result of the temperature sensor.

[0030] Therefore, the control device adjusts the rotation of the lead screw shaft based on the temperature detected by the temperature sensor, thereby adjusting the movement of the nut. Thus, in the mechanical device, the effects of temperature changes in the lead screw shaft can be suppressed.

[0031] Furthermore, in the temperature management system of one of the technical solutions disclosed herein, the first component is a lead screw shaft, the second component is a nut that can be rotatably fitted into the first component, and the mechanical device further includes: a plurality of balls that circulate within the second component; and a second RFID tag having a second temperature sensor that detects the temperature of the second component and sends the detected temperature of the second temperature sensor to the reader / writer. When the temperature difference between the detected temperature of the first temperature sensor and the temperature of the second temperature sensor is above a predetermined temperature difference, the control device detects an abnormality in the mechanical device.

[0032] Therefore, the control device wirelessly acquires the temperature of the lead screw and the nut via an RFID tag, a second RFID tag, and a reader / writer. Thus, the control device can easily acquire the temperature of the lead screw and the nut even while the lead screw is rotating. Consequently, the control device can easily manage the temperature of the lead screw and the nut.

[0033] Furthermore, for example, when the temperature of the nut rises due to friction between the nut and the balls, the temperature difference between the nut and the lead screw shaft becomes relatively large. Consequently, if the difference in thermal expansion between the nut and the lead screw shaft increases, the friction between the lead screw shaft and the balls, as well as between the nut and the balls, becomes greater, potentially shortening the lifespan of the mechanical device. Therefore, the control device detects abnormalities in the mechanical device when the temperature difference between the lead screw shaft and the nut exceeds a specified temperature difference. Thus, the temperature management system can prevent a shortened lifespan of the mechanical device.

[0034] In addition, in a temperature management system of one of the technical solutions disclosed herein, the RFID tag is disposed on the end face of the first component.

[0035] Therefore, compared to the case where the RFID tag is positioned on the outer circumference of the lead screw shaft, the centrifugal force acting on the RFID tag can be reduced. Thus, RFID tag malfunctions can be suppressed.

[0036] In addition, in a temperature management system of a technical solution disclosed herein, the second component includes: a main body having a through hole through which the first component passes; and a plurality of circulation components forming a passage for the ball bearing, each of the plurality of circulation components having a protrusion protruding from the main body, and the second RFID tag being disposed in the main body at a position between two of the plurality of protrusions.

[0037] When the friction between the circulating component and the ball bearing is relatively high, the temperature of the circulating component rises relatively earlier. Therefore, the second temperature sensor of the second RFID tag detects this temperature rise earlier. Consequently, the temperature difference between the readings of the temperature sensor and the second temperature sensor increases earlier. Thus, the temperature management system can detect mechanical abnormalities at an early stage.

[0038] Furthermore, in a temperature management system of one of the technical solutions disclosed herein, when viewed radially along the first component, the second temperature sensor overlaps with the path of the ball bearings in the second component.

[0039] Therefore, when the temperature of the nut rises due to friction between the balls and the nut, the temperature of the nut near the ball path rises relatively earlier. Consequently, the second temperature sensor detects the temperature rise of the nut near the ball path earlier. This causes the temperature difference between the temperature detected by the temperature sensor and the temperature detected by the second temperature sensor to increase earlier. Therefore, the temperature management system can detect abnormalities in the mechanical device at an early stage.

[0040] In addition, a temperature management system of one of the technical solutions disclosed herein includes a plurality of second RFID tags, which are arranged in a row along the central axis of the first component.

[0041] Therefore, by moving the reader along the central axis of the lead screw, the user can easily obtain the detected temperatures from multiple second temperature sensors. This allows for convenient management of the nut's temperature.

[0042] In addition, the temperature management system of one of the technical solutions disclosed herein has a plurality of second RFID tags. When the temperature difference between the detection result of the second temperature sensor of at least one of the plurality of second RFID tags and the detection result of the temperature sensor is greater than a predetermined temperature difference, the control device detects the abnormality of the mechanical device.

[0043] Therefore, even if there is an abnormality in a part of the mechanical device, the abnormality of the mechanical device can be detected early.

[0044] The effects of the invention

[0045] According to this disclosure, in a mechanical device having two components capable of relative motion and a temperature management system equipped with the mechanical device, it is possible to achieve structural simplification and early detection of mechanical device malfunctions. Attached Figure Description

[0046] Figure 1 This is a diagram showing the structure of the temperature management system according to the first embodiment of this disclosure.

[0047] Figure 2 It is observed along the central axis of the shaft member. Figure 1 The diagram shows the mechanical device.

[0048] Figure 3 It is the mechanical device along Figure 2 The sectional view along line III-III shown.

[0049] Figure 4 yes Figure 2 A top view of the temperature detection device shown.

[0050] Figure 5 yes Figure 3 An enlarged cross-sectional view of the temperature detection device shown.

[0051] Figure 6 This is a block diagram of an RFID tag.

[0052] Figure 7 This is a cross-sectional view of a temperature detection device in a mechanical device according to a first variation of the first embodiment of this disclosure.

[0053] Figure 8 This is a cross-sectional view of a temperature detection device in a mechanical device of a second variation of the first embodiment of this disclosure.

[0054] Figure 9 This is a cross-sectional view of a temperature detection device in a mechanical device according to a third variation of the first embodiment of this disclosure.

[0055] Figure 10 This is a diagram showing the structure of the temperature management system according to the second embodiment of this disclosure.

[0056] Figure 11 yes Figure 10 The side view of the ball screw shown.

[0057] Figure 12 This is a diagram showing the structure of the temperature management system according to the third embodiment of this disclosure.

[0058] Figure 13 It means Figure 12 A diagram showing the structure of the mechanical device.

[0059] Figure 14 It is the mechanical device along Figure 13 The cross-sectional view of line XIV-XIV shown.

[0060] Figure 15 It means Figure 14 A cross-sectional view of the temperature detection device shown.

[0061] Figure 16 This is a diagram showing the structure of the temperature management system according to the fourth embodiment of this disclosure.

[0062] Figure 17 It is along Figure 16 The side view of the mechanical device as observed by arrow XVII.

[0063] Figure 18 It means Figure 16 A cross-sectional view of the first temperature detection device is shown.

[0064] Figure 19 This is a partial cross-sectional view along the central axis of the mechanical device included in the temperature management system of a variation of the fourth embodiment of this disclosure.

[0065] Figure 20 It is the mechanical device along Figure 19 The sectional view shown is along line XX-XX. Detailed Implementation

[0066] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings, but the present disclosure is not limited thereto. The structural elements of the various embodiments and modifications described below can be appropriately combined. In addition, sometimes some structural elements are not used.

[0067] <First Implementation Method>

[0068] <Temperature Management System 1>

[0069] Figure 1 This diagram illustrates the structure of the temperature management system 1 according to the first embodiment of this disclosure. The temperature management system 1 of the first embodiment is a system that manages the temperature of the bearing 42 (described later) to detect abnormalities in the bearing 42, i.e., abnormalities in the mechanical device 20.

[0070] The temperature management system 1 includes a conveying device 2, a reader / writer 3, and a control device 4. Alternatively, the temperature management system 1 may also include multiple conveying devices 2.

[0071] The conveying device 2 is a roller conveyor that conveys industrial products along the conveying direction W. The conveying device 2 includes a pair of support platforms 10 and a plurality of mechanical devices 20. In this embodiment, the number of mechanical devices 20 is 10, but it is not limited to this number.

[0072] A pair of support platforms 10 support multiple mechanical devices 20. The pair of support platforms 10 are cuboid in shape and extend along the conveying direction W.

[0073] The mechanical device 20 includes a roller component 30 and a pair of mechanical parts 40.

[0074] The roller member 30 includes a shaft member 31 (equivalent to "first member" in the first embodiment) and a roller 32. The shaft member 31 is along the central axis Ax (see below). Figure 2 , Figure 3 The cylindrical shape extends from the shaft member 31. An RFID (Radio Frequency Identification) tag 33a, integrally formed with the temperature sensor 33b (described later), is mounted on the shaft member 31. Details of the temperature sensor 33b and the RFID tag 33a will be described later.

[0075] Roller 32 is a cylindrical shape disposed on the circumferential side of shaft member 31 and rotates integrally with shaft member 31. Both ends of shaft member 31 protrude from roller 32.

[0076] A pair of mechanical components 40 support the roller member 30 so that it can rotate relative to each other. Specifically, a pair of mechanical components 40 support both ends of the shaft member 31 so that they can rotate relative to each other. The mechanical component 40 is a shaft support. The mechanical component 40 includes a bearing 42 (equivalent to a "second component" in the first embodiment). The details of the mechanical component 40 will be described later.

[0077] A pair of mechanical components 40 are fixed to a pair of support platforms 10, for example, using fixing bolts, thereby supporting a plurality of mechanical devices 20 on the pair of support platforms 10. The plurality of mechanical devices 20 are configured such that the central axes Ax of the shaft members 31 are parallel to each other and the central axes Ax of the shaft members 31 are orthogonal to the conveying direction W.

[0078] The reader 3 communicates wirelessly with the RFID tag 33a on the mechanical device 20. The reader 3 can be carried by the user. The reader 3 is electrically connected to the control device 4 via wired or wireless means.

[0079] The user operates the reader 3 to send a carrier wave from the reader 3 to the RFID tag 33a. Correspondingly, the RFID tag 33a sends the temperature detected by the temperature sensor 33b (hereinafter referred to as the detection temperature of the temperature sensor 33b) to the reader 3. The reader 3 acquires the detection temperature of the temperature sensor 33b and sends it to the control device 4.

[0080] The reader 3 can simultaneously communicate wirelessly with multiple RFID tags 33a. Therefore, the reader 3 can acquire the detected temperatures of multiple temperature sensors 33b in a relatively short time. The reader 3 then sends the detected temperatures of the multiple temperature sensors 33b to the control device 4.

[0081] Control device 4 is a computer, which includes, for example, a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), internal storage, input interfaces, and output interfaces. The CPU, ROM, RAM, and internal storage are connected via an internal bus. The ROM stores programs such as the BIOS. The internal storage, such as an HDD (Hard Disk Drive) or flash memory, stores the operating system and application programs. The CPU executes programs stored in the ROM or internal storage using RAM as its working area to perform various functions.

[0082] The control device 4 obtains the detected temperature from the temperature sensor 33b from the reader 3. Based on the detected temperature of the temperature sensor 33b, the control device 4 detects any abnormalities in the bearing 42 prior to a failure of the bearing 42 in the mechanical component 40.

[0083] The abnormality of bearing 42 is caused by the temperature rise of shaft member 31 and the change in the dimensional relationship between shaft member 31 and bearing 42 (details will be described later). When the abnormality of bearing 42 is ignored, bearing 42 fails, and mechanical component 40 fails. That is, control device 4 detects the abnormality of bearing 42 that occurred before bearing 42 failed.

[0084] If the temperature detected by the temperature sensor 33b is above a predetermined temperature, the control device 4 determines that the bearing 42 is malfunctioning. The predetermined temperature is, for example, set to a temperature at which the bearing 42 will not be damaged, and is pre-stored in the internal storage of the control device 4. Based on the determination result of the control device 4, the user investigates the mechanical device 20 that is determined to be malfunctioning.

[0085] By periodically checking the temperature detected by the temperature sensor 33b using the control device 4, users can detect abnormalities in the bearing 42, i.e., abnormalities in the mechanical device 20, at an early stage.

[0086] As described above, according to this embodiment, the temperature management system 1 includes a mechanical device 20, a reader / writer 3, and a control device 4 electrically connected to the reader / writer 3 and storing the detected temperature of the temperature sensor 33b.

[0087] Thus, the reader 3 can easily obtain the detected temperature of the temperature sensor 33b from the mechanical device 20. Therefore, the control device 4 can easily obtain the detected temperature of the temperature sensor 33b via the reader 3. Therefore, the temperature management system 1 can achieve early detection of abnormalities in the mechanical device 20 with a simple structure.

[0088] In addition, the temperature management system 1 has multiple mechanical devices 20.

[0089] Therefore, the control device 4 can easily acquire the detected temperatures of multiple temperature sensors 33b via the reader 3. Thus, even when multiple mechanical devices 20 are present, the temperature management system 1 can achieve early detection of abnormalities in the mechanical devices 20 with a simple structure.

[0090] <Mechanical Devices 20>

[0091] In the following description, the Z direction in the illustration is defined as the vertical direction of the mechanical component 40, the X direction as the horizontal direction of the mechanical component 40, and the Y direction as the front-back direction of the mechanical component 40. The X, Y, and Z directions are orthogonal to each other. The central axis Ax of the shaft member 31 extends along the Y direction. Furthermore, the X, Y, and Z directions are examples, and this disclosure is not limited to these directions.

[0092] Figure 2 It is observed along the central axis Ax of shaft member 31. Figure 1 The diagram shows the mechanical device at position 20. Figure 3 It is along the mechanical device 20 Figure 2 The sectional view along line III-III shown. Figure 2 , Figure 3 In the text, roller 32 of roller component 30 is omitted.

[0093] like Figure 2 , Figure 3 As shown, the roller member 30 includes a temperature detection device 33. The temperature detection device 33 is disposed on the shaft member 31 and detects the temperature of the shaft member 31. The temperature detection device 33 is disposed on the end face F1 of the shaft member 31.

[0094] Figure 4 yes Figure 2 The top view of the temperature detection device 33 shown. Figure 5 yes Figure 3 An enlarged cross-sectional view of the temperature detection device 33 shown. Figure 6 This is a block diagram of RFID tag 33a.

[0095] The temperature detection device 33 includes an RFID tag 33a, a temperature sensor 33b, a cover component 33c, and an adhesive component 33d. The RFID tag 33a and the temperature sensor 33b are integrated into one unit.

[0096] RFID tag 33a is a passive RFID tag. RFID tag 33a has... Figure 5 The substrate 33a1 is shown. A temperature sensor 33b is disposed on the substrate 33a1. Figure 6 The antenna 33e and control circuit 33f are shown.

[0097] Temperature sensor 33b detects the temperature of shaft component 31. That is, the temperature detected by temperature sensor 33b is equivalent to the temperature detected by temperature detection device 33.

[0098] like Figure 5 As shown, the temperature sensor 33b is disposed on the main surface 33a2 of the substrate 33a1. With the temperature detection device 33 disposed on the shaft member 31, the temperature sensor 33b faces the end face F1 of the shaft member 31. A space exists between the temperature sensor 33b and the end face F1 of the shaft member 31. This allows for the suppression of vibrations from the shaft member 31 transmitted to the temperature sensor 33b, thus preventing malfunctions of the temperature sensor 33b.

[0099] Figure 6 The control circuit 33f shown is electrically connected to the temperature sensor 33b and the antenna 33e. The antenna 33e receives a carrier wave from the reader 3. The control circuit 33f is driven by the power generated by the carrier wave.

[0100] The control circuit 33f acquires the detected temperature of the temperature sensor 33b and stores it in the storage area 33f1. The control circuit 33f then transmits the detected temperature of the temperature sensor 33b stored in the storage area 33f1 to the reader 3 via the antenna 33e.

[0101] Additionally, the control circuit 33f sends identification information (e.g., identification number) of the mechanical device 20, corresponding to the temperature detected by the temperature sensor 33b, to the reader 3. This identification information is pre-stored in the storage area 33f1 by the reader 3. The control device 4 stores the temperature detected by the temperature sensor 33b in correspondence with the identification information. Therefore, the control device 4 is able to identify the mechanical device 20 for which the bearing 42 is deemed to have an abnormality.

[0102] Figure 5 The cover member 33c shown protects the RFID tag 33a. The cover member 33c is a flat plate including a mounting surface 33c1. The mounting surface 33c1 is flat. The mounting surface 33c1 has a recess 33c2 for mounting the RFID tag 33a. When viewed from above, the recess 33c2 is located at the center of the cover member 33c.

[0103] Furthermore, with the RFID tag 33a disposed in the recess 33c2, the mounting surface 33c1 of the cover member 33c and the main surface 33a2 of the substrate 33a1 are located on the same plane. That is, with the RFID tag 33a disposed in the recess 33c2, the mounting surface 33c1 exists around the entire circumference of the main surface 33a2 of the substrate 33a1. Alternatively, the mounting surface 33c1 of the cover member 33c and the main surface 33a2 of the substrate 33a1 may also be located on different planes. Additionally, with the RFID tag 33a disposed in the recess 33c2, the temperature sensor 33b protrudes from the mounting surface 33c1.

[0104] The material of the cover component 33c is thermoplastic resin. Specifically, the material of the cover component 33c is nylon resin, which is waterproof and oil-resistant. Therefore, the cover component 33c is waterproof and oil-resistant. The waterproof and oil-resistant properties of the cover component 33c mean that during the use of the mechanical device 20, changes in the properties of the cover component 33c caused by water, oil used in the mechanical device 20, and lubricating grease can be suppressed, and the operation of the temperature sensor 33b and the RFID tag 33a will not be affected.

[0105] An adhesive member 33d is disposed on the mounting surface 33c1 of the cover member 33c, and adhesively attaches the RFID tag 33a and the cover member 33c to the end face F1 of the shaft member 31. The adhesive member 33d is also disposed on the main surface 33a2 of the substrate 33a1. The adhesive member 33d has a third through hole 33d1 that allows the temperature sensor 33b to be located inside. Thus, the temperature sensor 33b is positioned opposite the end face F1 of the shaft member 31 across a space. Furthermore, the third through hole 33d1 reduces the space between the temperature sensor 33b and the end face F1 of the shaft member 31. Therefore, the temperature sensor 33b can detect the temperature of the shaft member 31 with high accuracy.

[0106] The adhesive component 33d is a double-sided adhesive tape. The adhesive component 33d is waterproof. The adhesive component 33d is a so-called waterproof tape. The waterproof nature of the adhesive component 33d means that during the use of the mechanical component 40, changes in the properties of the adhesive component 33d due to water can be suppressed, and the operation of the temperature sensor 33b and the RFID tag 33a will not be affected.

[0107] Furthermore, the adhesive member 33d is disposed around the RFID tag 33a on the mounting surface 33c1 of the cover member 33c. Therefore, water tightness is ensured between the cover member 33c and the outer surface of the housing 41, preventing water from adhering to the temperature sensor 33b and the RFID tag 33a.

[0108] Figure 2 , Figure 3 The mechanical component 40 shown includes a housing 41 and a bearing 42.

[0109] The housing 41 integrally has a main body portion 41a and a flange portion 41b. The main body portion 41a has a first through hole 41a1 through which the shaft member 31 passes.

[0110] Flanges 41b are located on both sides of the main body 41a in the X direction. Flanges 41b have second through holes 41b1 for bolts to pass through, which are used to mount mechanical components 40 to the support 10. The lower surface (the surface on the -Z side) of the housing 41 corresponds to the mounting surface F2 that contacts the support 10.

[0111] The bearing 42 is disposed within the housing 41 and supports the shaft member 31 so that it can rotate relative to the housing 41. The axis of the bearing 42 is substantially parallel to the central axis Ax of the shaft member 31.

[0112] Bearing 42 is a ball bearing. Alternatively, bearing 42 can also be a roller bearing. Bearing 42 is disposed in the first through hole 41a1. Bearing 42 has an outer ring 42a, an inner ring 42b, and a plurality of balls 42c.

[0113] The outer ring 42a is fitted into the annular groove 41a2 on the inner circumferential surface of the first through hole 41a1. The outer ring 42a is fixed to the housing 41. The inner ring 42b is located inside the outer ring 42a. The shaft member 31 is fixed on the inner ring 42b in a manner that allows it to rotate integrally. The inner circumferential surface of the inner ring 42b is in contact with the outer circumferential surface of the shaft member 31. A plurality of balls 42c are disposed between the outer ring 42a and the inner ring 42b.

[0114] Additionally, a preload is applied to bearing 42. Preload is an axial load (a load in a direction orthogonal to the axis of bearing 42) that applies to bearing 42 with negative clearances between the outer ring 42a and the balls 42c, and between the inner ring 42b and the balls 42c. Alternatively, preload may not be applied to bearing 42.

[0115] When the shaft member 31 rotates relative to the housing 41, the inner ring 42b rotates relative to the outer ring 42a. At this time, a plurality of balls 42c roll relative to the outer ring 42a and the inner ring 42b.

[0116] Next, the operation of mechanical component 40 when bearing 42 malfunctions will be explained.

[0117] exist Figure 1 When the conveyor 2 shown conveys industrial products, a load from the shaft member 31 acts on the bearing 42. Frictional forces are generated between the balls 42c and the inner ring 42b, and between the balls 42c and the outer ring 42a, due to the load from the shaft member 31. When the condition of the bearing 42 changes due to this frictional force, abnormalities such as damage to the bearing 42 may occur. When these abnormalities develop, failures such as bearing seizure may occur.

[0118] Furthermore, when the temperature of the shaft member 31 rises, the shaft member 31 expands. As the shaft member 31 expands, the dimensional relationship between the shaft member 31 and the bearing 42 changes, and the shaft member 31 pushes open the inner ring 42b. Consequently, the dimensional relationship of the bearing 42 changes, increasing the friction between the balls 42c and the inner ring 42b, and between the balls 42c and the outer ring 42a. When preload is applied to the bearing 42 as described above, this friction is further increased compared to when no preload is applied to the bearing 42, increasing the likelihood of abnormalities such as damage to the bearing 42.

[0119] As described above, the temperature detection device 33 is disposed on the shaft member 31. Therefore, the temperature detected by the temperature detection device 33 rises in advance according to the temperature rise of the shaft member 31.

[0120] As described above, the temperature detected by the temperature detection device 33 is stored in the control device 4 via the reader 3. Furthermore, if the temperature detected by the temperature detection device 33 is above a predetermined temperature, the control device 4 determines that the bearing 42 is malfunctioning. Therefore, by placing the temperature detection device 33 on the shaft member 31, malfunctions in the bearing 42, i.e., malfunctions in the mechanical device 20, can be detected in advance.

[0121] As described above, according to this embodiment, the mechanical device 20 includes: a shaft member 31; a bearing 42 that supports the shaft member 31 so that it can rotate (can move relative to each other); and an RFID tag 33a that has a temperature sensor 33b that detects the temperature of the shaft member 31 and sends the detected temperature of the temperature sensor 33b to the reader 3. The temperature sensor 33b is disposed on the end face F1 of the shaft member 31.

[0122] Therefore, the temperature sensor 33b is disposed on the shaft member 31, and the detected temperature of the temperature sensor 33b is sent to the reader 3. Thus, the detected temperature of the temperature sensor 33b can be output with a simple structure. Furthermore, the detected temperature of the temperature sensor 33b can be output regardless of its position. Therefore, the structure of the mechanical device 20 can be simplified.

[0123] Furthermore, if the temperature of the shaft member 31 rises and the shaft member 31 expands, the dimensional relationship between the shaft member 31 and the bearing 42 will change. As a result, malfunctions of the bearing 42 may sometimes occur. That is, by detecting the temperature of the shaft member 31 using the temperature sensor 33b, it is possible to facilitate the early detection of malfunctions in the bearing 42 and the mechanical device 20 based on the temperature of the shaft member 31.

[0124] Furthermore, when the temperature sensor 33b is disposed on the end face F1 of the shaft member 31, the centrifugal force acting on the temperature sensor 33b can be reduced compared to when the temperature sensor 33b is disposed on the outer peripheral surface of the shaft member 31. Therefore, malfunctions of the temperature sensor 33b can be suppressed.

[0125] Next, regarding the temperature management system 1 and mechanical device 20 of the modified embodiment of the present disclosure, the differences from the mechanical device 20 of the above embodiment will be mainly explained.

[0126] For example, the temperature management system 1 may also include a device containing mechanical device 20 instead of the conveying device 2.

[0127] Furthermore, the mechanical component 40 is not limited to a shaft assembly. The mechanical component 40 only needs to include the bearing 42.

[0128] Alternatively, the temperature detection device 33 can also be disposed on the circumferential side of the shaft member 31.

[0129] Alternatively, the RFID tag 33a can also be an active RFID tag. In this case, the RFID tag 33a also has a power source.

[0130] Alternatively, the adhesive member 33d may also be elastic. In this case, the adhesive member 33d may, for example, have an elastic sheet-like substrate and adhesive layers disposed on both sides of the substrate. The substrate may be formed, for example, from a foaming resin such as foamed polyethylene. When the conveying device 2 is in operation, the elasticity of the adhesive member 33d can suppress vibrations transmitted from the shaft member 31 to the temperature sensor 33b and the RFID tag 33a.

[0131] Alternatively, the adhesive component 33d can also be formed by curing an adhesive (such as an epoxy-based adhesive). Furthermore, the adhesive component 33d can also be a butyl tape with waterproof and oil-resistant properties.

[0132] Alternatively, the temperature sensing device 33 may not have an adhesive member 33d. In this case, the temperature sensing device 33 may be fixed to the shaft member 31, for example, by bolts.

[0133] Alternatively, the cover member 33c may also be shaped to cover a portion of the main surface 33a2 of the substrate 33a1 while the temperature sensor 33b is exposed.

[0134] Figure 7 This is a cross-sectional view of the temperature detection device 33 in the mechanical device 20 of the first modification of the first embodiment of this disclosure.

[0135] The mechanical device 20 of this first modification also includes thermal paste 133g. Thermal paste 133g is, for example, a silicone-based thermal grease. However, thermal paste 133g is not limited to silicone-based; it can be any paste-like substance. Alternatively, thermal paste 133g can also be a thermosetting resin (e.g., epoxy resin) containing Ag particles with high thermal conductivity.

[0136] Thermal paste 133g is filled into the third through hole 33d1 with the temperature sensing device 33 disposed on the shaft member 31. Thus, the temperature sensor 33b and the shaft member 31 are thermally connected via the thermal paste 133g.

[0137] In this first modified mechanical device 20, compared with the mechanical device 20 of the above-described embodiment, the heat of the shaft member 31 is efficiently transferred to the temperature sensor 33b via the thermal paste 133g.

[0138] Figure 8 This is a cross-sectional view of the temperature detection device 33 in the mechanical device 20 of the second modification of the first embodiment of this disclosure. In this second modification, the adhesive member 233d does not have a third through hole 33d1. The adhesive member 233d covers the entire RFID tag 33a. Thus, the temperature sensor 33b is covered by the adhesive member 233d. Thus, the temperature sensor 33b is thermally connected to the shaft member 31 via the adhesive member 233d.

[0139] In this second variation of the mechanical device 20, compared to the mechanical device 20 of the above-described embodiment, the heat from the shaft member 31 is efficiently transferred to the temperature sensor 33b via the adhesive member 233d. Furthermore, the adhesive member 233d may also contain particles such as Ag with high thermal conductivity. In this case, the heat from the shaft member 31 is transferred to the temperature sensor 33b more efficiently via the adhesive member 233d.

[0140] Figure 9 This is a cross-sectional view of the temperature detection device 33 in the mechanical device 20 of the third modification of the first embodiment of this disclosure. In this third modification, the shaft member 31 has a recess 331a for embedding a temperature sensor 33b. Figure 9 In this third variation, the adhesive component 33d is omitted. In this variation, the adhesive component 33d may also be a component cured from a cyanoacrylate-based adhesive. In this case, the thickness of the adhesive component 33d can be reduced.

[0141] In the mechanical device 20 of this third variation, the temperature sensor 33b is located inside the recess 331a, so that the temperature sensor 33b can detect the temperature of the shaft member 31 with higher accuracy.

[0142] <Second Implementation Method>

[0143] <Temperature Management System 1a and Mechanical Device 402>

[0144] Next, regarding the temperature management system 1a and mechanical device 402 of the second embodiment of this disclosure, the differences from the temperature management system 1 of the first embodiment described above will be explained.

[0145] In the following description, the Z direction in the illustration is defined as the height direction of the mechanical device 402 described later, the X direction is defined as the left-right direction of the mechanical device 402, and the Y direction is defined as the front-back direction of the mechanical device 402. The X, Y, and Z directions are orthogonal to each other. Furthermore, the X, Y, and Z directions are examples, and this disclosure is not limited to these directions.

[0146] Figure 10 This diagram illustrates the structure of the temperature management system 1a according to the second embodiment of this disclosure. The temperature management system 1a of the second embodiment is a system that manages the temperature of the lead screw 431 (described later) to detect abnormalities in the bearing 440 (described later). The temperature management system 1a is, for example, applied to a machine tool used for machining workpieces.

[0147] The temperature management system 1a includes a mechanical device 402, a reader / writer 3, and a control device 4. The reader / writer 3 and the control device 4 are the same as those in the first embodiment described above.

[0148] Mechanical device 402 is an XY worktable that moves a workpiece along the X and Y directions. Mechanical device 402 includes a fixed part 410, a moving part 420, and a worktable T for placing the workpiece.

[0149] The fixing part 410 includes a first base 411, a pair of first guide rails 412 and a first ball screw 430a. A pair of first guide rails 412 and a first ball screw 430a are arranged on the upper surface 411a (the +Z side surface) of the first base 411.

[0150] A pair of first guide rails 412 extend along the Y direction to guide the moving part 420. The first ball screw 430a includes a first screw shaft 431a and a first nut 432a.

[0151] The first lead screw shaft 431a extends along the Y direction. A first end of the first lead screw shaft 431a is supported by a first support body 413. The first support body 413 includes a first bearing 440a that supports the first lead screw shaft 431a so that it can rotate. The first bearing 440a is a ball bearing. Alternatively, the first bearing 440a may also be a roller bearing.

[0152] The second end of the first lead screw shaft 431a is fixed to the output shaft of the first motor 450a in a manner that allows it to rotate integrally. The first motor 450a rotates the first lead screw shaft 431a. The first motor 450a is equipped with a first rotary encoder 451a that detects the amount of rotation of the output shaft. The detection result of the first rotary encoder 451a is sent to the control device 4.

[0153] A first nut 432a is rotatably fitted onto a first lead screw shaft 431a. Multiple balls are disposed inside the first nut 432a. Rotation of the first lead screw shaft 431a causes the balls to circulate within the first nut 432a. A movable part 420 is fixed within the first nut 432a. Rotation of the first lead screw shaft 431a causes both the first nut 432a and the movable part 420 to move along the Y-direction.

[0154] The movable part 420 has a second base 421, a pair of second guide rails 422, and a second ball screw 430b. A first nut 432a is fixed on the -Z side surface of the second base 421. A pair of second guide rails 422 and a second ball screw 430b are arranged on the upper surface 21a (+Z side surface) of the second base 421.

[0155] A pair of second guide rails 422 extend along the X direction to guide the worktable T. The second ball screw 430b has a second screw shaft 431b and a second nut 432b.

[0156] The second lead screw shaft 431b extends along the X direction. A first end of the second lead screw shaft 431b is supported by a second support body 423. The second support body 423 includes a second bearing 440b that supports the second lead screw shaft 431b for rotation. The second bearing 440b is a ball bearing. Alternatively, the second bearing 440b may also be a roller bearing.

[0157] The second end of the second lead screw shaft 431b is rotatably fixed to the output shaft of the second motor 450b. The second motor 450b rotates the second lead screw shaft 431b. The second motor 450b is equipped with a second rotary encoder 451b that detects the amount of rotation of the output shaft. The detection result of the second rotary encoder 451b is sent to the control device 4.

[0158] The second nut 432b is rotatably fitted into the second lead screw shaft 431b. Multiple balls are arranged inside the second nut 432b. Rotation of the second lead screw shaft 431b causes the balls to circulate within the second nut 432b. The worktable T is fixed to the second nut 432b. Rotation of the second lead screw shaft 431b causes both the second nut 432b and the worktable T to move along the X-direction.

[0159] The first ball screw 430a and the second ball screw 430b are constructed identically to each other. That is, the first screw shaft 431a and the second screw shaft 431b are constructed identically to each other. In addition, the first nut 432a and the second nut 432b are constructed identically to each other.

[0160] Furthermore, the first bearing 440a and the second bearing 440b are constructed identically to each other. The first motor 450a and the second motor 450b are constructed identically to each other. The first rotary encoder 451a and the second rotary encoder 451b are constructed identically to each other.

[0161] Hereinafter, when referring to the first ball screw 430a and the second ball screw 430b without distinction, they will be simply referred to as "ball screw 430". Similarly, when referring to the first screw shaft 431a and the second screw shaft 431b without distinction, they will be simply referred to as "screw shaft 431", and when referring to the first nut 432a and the second nut 432b without distinction, they will be simply referred to as "nut 432". In the second embodiment, screw shaft 431 is equivalent to "first component". In the second embodiment, "nut 432" is equivalent to "second component".

[0162] Furthermore, when referring to the first bearing 440a and the second bearing 440b without distinguishing them from each other, they are simply referred to as "bearing 440". When referring to the first motor 450a and the second motor 450b without distinguishing them from each other, they are simply referred to as "motor 450". When referring to the first rotary encoder 451a and the second rotary encoder 451b without distinguishing them from each other, they are simply referred to as "rotary encoder 451".

[0163] Figure 11 yes Figure 10 The diagram shows a side view of the ball screw 430. The ball screw 430 also includes a temperature detection device 33. The temperature detection device 33 detects the temperature of the screw shaft 431. The temperature detection device 33 is disposed on the end face F3 of the screw shaft 431. The temperature detection device 33 is the same as the temperature detection device 33 described in the first embodiment above.

[0164] Temperature sensor 33b detects the temperature of lead screw shaft 431. That is, the temperature detected by temperature sensor 33b is equivalent to the temperature detected by temperature detection device 33. When temperature detection device 33 is disposed on lead screw shaft 431, temperature sensor 33b is opposite to end face F3 of lead screw shaft 431 in the same manner as in the first embodiment described above.

[0165] Figure 10 The reader 3 shown communicates wirelessly with the RFID tag 33a in the same way as in the first embodiment described above. Therefore, the reader 3 and the RFID tag 33a can communicate even when the lead screw 431 is rotating.

[0166] The control device 4 adjusts the position of the worktable T by controlling the rotation of the lead screw 431. Specifically, the control device 4 calculates the movement of the worktable T in the X direction and the Y direction based on the difference between the target position and the current position of the worktable T. The movement of the worktable T in the X direction is equivalent to the movement of the second nut 432b. The movement of the worktable T in the Y direction is equivalent to the movement of the first nut 432a.

[0167] The amount of movement of nut 432 is derived based on the rotation angle (general angle) of lead screw shaft 431 and the lead of lead screw shaft 431. The rotation angle of lead screw shaft 431 corresponds to the amount of rotation of lead screw shaft 431. The amount of rotation of lead screw shaft 431 corresponds to the amount of rotation of motor 450. Control device 4 controls the amount of rotation of lead screw shaft 431 by controlling the amount of rotation of motor 450. Control device 4 controls the amount of rotation of motor 450 based on the detection result of rotary encoder 451.

[0168] The control device 4 derives the rotation amount of the motor 450 based on the movement amount of the worktable T, and drives the motor 450 with the derived rotation amount. As a result, the worktable T is positioned at the target position.

[0169] Furthermore, if the temperature of the lead screw shaft 431 changes, the length of the lead screw shaft 431 will change, and the lead of the lead screw shaft 431 will change. The change in the lead of the lead screw shaft 431 affects the amount of movement of the nut 432 and the position of the worktable T. Therefore, the control device 4 corrects the rotation of the lead screw shaft 431 based on the temperature detected by the temperature sensor 33b. The control device 4 corrects the rotation of the lead screw shaft 431 by correcting the rotation of the motor 450.

[0170] The reader 3 communicates wirelessly with the RFID tag 33a provided by the mechanical device 402 in the same manner as in the first embodiment described above.

[0171] The control device 4, similar to the first embodiment described above, acquires the detected temperature of the temperature sensor 33b from the reader 3. The control device 4 uses the detected temperature of the temperature sensor 33b to derive a correction coefficient. The higher the temperature of the lead screw 431, the longer the lead of the lead screw 431. Therefore, the higher the detected temperature of the temperature sensor 33b, the larger the correction coefficient. The relationship between the detected temperature of the temperature sensor 33b and the correction coefficient is derived through experiments and simulations, and is pre-stored in the internal storage of the control device 4.

[0172] The control device 4 multiplies the rotation of the motor 450, derived from the movement of the worktable T as described above, by a correction factor. This corrects the rotation of the lead screw 431, and precisely adjusts the position of the nut 432 and the worktable T.

[0173] Users can precisely adjust the position of the worktable T by periodically checking the temperature detected by the temperature sensor 33b.

[0174] In addition, the control device 4 detects abnormalities in the bearing 440 before a failure occurs in the bearing 440 in the first support 413 and the second support 423, based on the temperature detected by the temperature sensor 33b.

[0175] The abnormality of bearing 440 is caused by the temperature rise of the lead screw shaft 431 and the change in the dimensional relationship between the lead screw shaft 431 and bearing 440. When the temperature of the lead screw shaft 431 rises, the diameter of the lead screw shaft 431 increases, causing damage to bearing 440 and other abnormalities. When the abnormality of bearing 440 develops, failures such as bearing seizure occur.

[0176] Therefore, if the temperature detected by the temperature detection device 33 is above a predetermined temperature, the control device 4 determines that the bearing 440 is malfunctioning. Thus, by placing the temperature detection device 33 on the lead screw shaft 431, malfunctions in the bearing 440 can be detected in advance.

[0177] The control device 4 stores the temperature detected by the temperature sensor 33b in correspondence with the aforementioned identification information. Therefore, the control device 4 is able to identify bearings 440 that are determined to have an abnormality. Based on the determination result of the control device 4, the user investigates the bearings 440 that are determined to have an abnormality.

[0178] By periodically checking the temperature detected by the temperature sensor 33b using the control device 4, users can detect abnormalities in the bearing 440 and mechanical device 402 at an early stage.

[0179] As explained above, according to this embodiment, the mechanical device 402 includes: a lead screw shaft 431; a nut 432 that is rotatably (movably) engaged with the lead screw shaft 431; and an RFID tag 33a that has a temperature sensor 33b that detects the temperature of the lead screw shaft 431 and sends the detected temperature of the temperature sensor 33b to the reader 3. The temperature sensor 33b is disposed on the end face F3 of the lead screw shaft 431.

[0180] Therefore, even when the mechanical device 402 has a lead screw shaft 431 and a nut 432 that can be rotatably fitted into the lead screw shaft 431, as described above, the structure of the mechanical device 402 can be simplified, and it can help to detect abnormalities of the mechanical device 402 earlier based on the temperature of the lead screw shaft 431.

[0181] Furthermore, when the temperature sensor 33b is disposed on the end face F3 of the lead screw shaft 431, the centrifugal force acting on the temperature sensor 33b can be reduced compared to when the temperature sensor 33b is disposed on the outer peripheral surface of the lead screw shaft 431. Therefore, malfunctions of the temperature sensor 33b can be suppressed.

[0182] In addition, in the temperature management system 1b, the control device 4 controls the rotation of the lead screw shaft 431 and corrects the rotation of the lead screw shaft 431 based on the detection results of the temperature sensor 33b.

[0183] Therefore, the control device 4 corrects the rotation of the lead screw shaft 431 based on the temperature detected by the temperature sensor 33b, thereby correcting the movement of the nut 432. Thus, in the mechanical device 402, the influence of temperature changes on the lead screw shaft 431 can be suppressed.

[0184] Next, regarding the temperature management system 1a and mechanical device 402 of the second embodiment of this disclosure, the differences between them and the temperature management system 1a and mechanical device 402 of the second embodiment described above will be explained.

[0185] For example, the mechanical device 402 may not be an XY worktable, but a device (such as a robotic arm) that includes a ball screw 430.

[0186] Alternatively, the temperature sensing device 33 can also be disposed on the circumferential side of the lead screw shaft 431. Alternatively, the temperature sensing device 33 can also be disposed on the nut 432. In this case, the temperature sensing device 33 detects the temperature of the lead screw shaft 431 via the nut 432.

[0187] <Third Implementation Method>

[0188] Next, regarding the temperature management system 1b and mechanical device 530 of the third embodiment of this disclosure, the differences from the temperature management system 1 and mechanical device 20 of the first embodiment described above will be explained.

[0189] <Temperature Management System 1b>

[0190] Figure 12 This diagram illustrates the structure of the temperature management system 1b according to the third embodiment of this disclosure. The temperature management system 1b is a system that monitors a mechanical device 505 including the mechanical device 530 described later. The temperature management system 1b includes the mechanical device 505, a reader / writer 3, and a control device 4. The reader / writer 3 and control device 4 are the same as those in the first embodiment described above. Furthermore, the temperature management system 1b may also include multiple mechanical devices 505.

[0191] Mechanical device 505 is an XY worktable that moves a workpiece along the X and Y directions. Mechanical device 505 includes a fixed part 510, a moving part 520, and a worktable T for placing the workpiece.

[0192] The fixing part 510 includes a first base 511, two first mechanical devices 530a and a first ball screw 540a. The two first mechanical devices 530a and the first ball screw 540a are arranged on the upper surface 511a (the surface on the +Z side) of the first base 511.

[0193] The first mechanical device 530a is a linear guide rail that guides the moving part 520 along the Y direction. The first mechanical device 530a includes a first guide rail 531a extending along the Y direction, two first sliding members 532a mounted on the first guide rail 531a in a slidable manner relative to the first guide rail 531a, and a plurality of first rolling elements (in...) that roll between the first guide rail 531a and the first sliding members 532a. Figure 1 (Not shown in the figure). A movable part 520 is fixed to the first sliding member 532a. The details of the first mechanical device 530a will be described later.

[0194] The first ball screw 540a has a first screw shaft 541a and a first nut 542a.

[0195] A first lead screw shaft 541a extends along the Y direction. A first end of the first lead screw shaft 541a is supported on a first support body 512. The first support body 512 includes a first bearing 550a that supports the first lead screw shaft 541a so that it can rotate. The first bearing 550a is, for example, a rolling bearing.

[0196] The second end of the first lead screw shaft 541a is fixed to the output shaft of the first motor 560a in a manner that allows it to rotate as a single unit. The first motor 560a causes the first lead screw shaft 541a to rotate.

[0197] A first nut 542a is rotatably fitted onto a first lead screw shaft 541a. Multiple balls are disposed inside the first nut 542a. Rotation of the first lead screw shaft 541a causes the balls to circulate within the first nut 542a. A movable part 520 is fixed within the first nut 542a. Rotation of the first lead screw shaft 541a causes the first nut 542a, the first sliding member 532a, and the movable part 520 to move along the Y-direction.

[0198] The movable part 520 includes a second base 521, two second mechanical devices 530b, and a second ball screw 540b. A first sliding member 532a and a first nut 542a are fixed on the back side (-Z side) of the second base 521. The two second mechanical devices 530b and the second ball screw 540b are arranged on the upper surface 521a (+Z side) of the second base 521.

[0199] The second mechanical device 530b guides the worktable T along the X direction. The second mechanical device 530b includes a second guide rail 531b extending along the X direction, two second sliding members 532b mounted on the second guide rail 531b in a slidable manner relative to the second guide rail 531b, and a plurality of second rolling elements (in) that roll between the second guide rail 531b and the second sliding members 532b. Figure 1 (Not shown in the diagram). The worktable T is fixed by the second sliding member 532b. The details of the second mechanical device 530b will be described later.

[0200] The second ball screw 540b has a second screw shaft 541b and a second nut 542b.

[0201] The second lead screw shaft 541b extends along the X direction. A first end of the second lead screw shaft 541b is supported by a second support body 522. The second support body 522 includes a second bearing 550b that supports the second lead screw shaft 541b for rotation. The second bearing 550b is a rolling bearing.

[0202] The second end of the second lead screw shaft 541b is fixed to the output shaft of the second motor 560b in a manner that allows it to rotate as a single unit. The second motor 560b causes the second lead screw shaft 541b to rotate.

[0203] The second nut 542b is rotatably fitted into the second lead screw shaft 541b. Multiple balls are arranged inside the second nut 542b. Rotation of the second lead screw shaft 541b causes the balls to circulate within the second nut 542b. The worktable T is fixed in place by the second nut 542b. Rotation of the second lead screw shaft 541b causes the second nut 542b, the second sliding member 532b, and the worktable T to move along the X-direction.

[0204] The first ball screw 540a and the second ball screw 540b are identically configured. The first bearing 550a and the second bearing 550b are identically configured. The first motor 560a and the second motor 560b are identically configured.

[0205] Furthermore, the first mechanical device 530a and the second mechanical device 530b are configured identically to each other. That is, the first guide rail 531a and the second guide rail 531b, the first sliding member 532a and the second sliding member 532b, and the first rolling element and the second rolling element are each configured identically to each other.

[0206] Hereinafter, when describing the first mechanical device 530a and the second mechanical device 530b without distinguishing between them, it will be simply referred to as "mechanical device 530". Similarly, when describing the first guide rail 531a and the second guide rail 531b without distinguishing between them, it will be simply referred to as "guide rail 531". When describing the first sliding member 532a and the second sliding member 532b without distinguishing between them, it will be simply referred to as "sliding member 532". In addition, when describing the first rolling element and the second rolling element without distinguishing between them, it will be simply referred to as "rolling element B". In the third embodiment, the sliding member 532 is equivalent to the "first component". In the third embodiment, the "guide rail 531" is equivalent to the "second component".

[0207] In addition, the mechanical device 530 includes a temperature sensor 33b for detecting the temperature of the sliding member 532 as described later, and an RFID tag 33a integrated with the temperature sensor 33b.

[0208] The reader 3 communicates wirelessly with the RFID tag 33a provided in the mechanical device 530 in the same way as in the first embodiment described above.

[0209] The control device 4 obtains the detected temperature from the temperature sensor 33b from the reader 3. Based on the detected temperature of the temperature sensor 33b, the control device 4 detects abnormalities in the mechanical device 530 prior to a malfunction of the mechanical device 530.

[0210] The malfunction of mechanical device 530 is caused by the repeated sliding of sliding member 532 relative to guide rail 531, resulting in changes in the state of mechanical device 530 (e.g., changes over time). When the malfunction of mechanical device 530 is ignored, mechanical device 530 malfunctions. That is, control device 4 detects malfunctions in mechanical device 530 that occur before malfunction occurs.

[0211] As the state of mechanical device 530 changes, the temperature detected by temperature sensor 33b rises (details described later). When the temperature detected by temperature sensor 33b exceeds a preset temperature, control device 4 determines that mechanical device 530 is malfunctioning. Based on the determination result of control device 4, the user investigates the mechanical device 530 that is determined to be malfunctioning.

[0212] Users can periodically check the temperature detected by temperature sensor 33b through control device 4, thereby enabling early detection of abnormalities in mechanical device 530.

[0213] <Mechanical Device 530>

[0214] Figure 13 It means Figure 12 A diagram showing the structure of the mechanical device 530. Figure 14 It is along the mechanical device 530 Figure 13The cross-sectional view along line XⅣ-XⅣ is shown.

[0215] The first direction D1 shown in the figure is the direction in which the guide rail 531 extends. The second direction D2 is orthogonal to the first direction D1 and parallel to the mounting surface H (the upper surface 511a of the first base 511 or the upper surface 521a of the second base 521) on which the guide rail 531 is disposed. The third direction D3 is orthogonal to the mounting surface H and is orthogonal to both the first direction D1 and the second direction D2.

[0216] As described above, the mechanical device 530 includes a guide rail 531, a slider 532, and a plurality of rolling elements B. The rolling elements B are spherical. Alternatively, the rolling elements B may also be cylindrical.

[0217] The guide rail 531 is straight. The outer surface of the guide rail 531 has a pair of first track grooves Gr1 and a pair of second track grooves Gr2. The first track grooves Gr1 and the second track grooves Gr2 extend along the direction in which the guide rail 531 extends.

[0218] The slider 532 is mounted on the guide rail 531 in a slidable manner. The sliding direction of the slider 532 is the direction in which the guide rail 531 extends (i.e., the first direction D1).

[0219] The slider 532 has a U-shaped cross-section with an open mounting surface H. The slider 532 has a pair of first slider grooves Gs1 opposite to a pair of first track grooves Gr1 and a pair of second slider grooves Gs2 opposite to a pair of second track grooves Gr2. The second base 521 or worktable T is fixed to the slider 532 on the opposite side S2 of the opposite surface S1 opposite to the mounting surface H, as described above.

[0220] When the slider 532 moves relative to the guide rail 531, the rolling body B rolls in the opposite direction to the sliding direction between the first track groove Gr1 and the first slider groove Gs1 and between the second track groove Gr2 and the second slider groove Gs2.

[0221] In addition, the slider 532 also has a pair of first rolling paths Rt1 and a pair of second rolling paths Rt2. The first rolling path Rt1 is a passage connecting the two ends of the first slider groove Gs1 and allowing the rolling elements B to roll. When the slider 532 moves relative to the guide rail 531, the first track groove Gr1 and the first slider groove Gs1, together with the first rolling path Rt1, form a first circulation path Rc1 for the circulation of multiple rolling elements B.

[0222] The second rolling path Rt2 is a passage connecting the two ends of the second sliding groove Gs2, allowing the rolling elements B to roll. When the sliding member 532 moves relative to the guide rail 531, the second track groove Gr2, the second sliding groove Gs2, and the second rolling path Rt2 together form a second circulation path Rc2 for multiple rolling elements B to circulate.

[0223] The first circulation path Rc1 and the second circulation path Rc2 are located separately in the third direction D3. Hereinafter, without distinguishing between the first circulation path Rc1 and the second circulation path Rc2, they will be simply referred to as "circulation path Rc". When multiple rolling elements B circulate in the circulation path Rc, friction is generated between the circulation path Rc and the rolling elements B.

[0224] In addition, the mechanical device 530 also includes a temperature detection device 33. The temperature detection device 33 detects the temperature of the sliding member 532. The temperature detection device 33 is disposed on the outer surface F4 of the sliding member 532.

[0225] Figure 15 It means Figure 14 A cross-sectional view of the temperature detection device 33 shown. Figure 15 This indicates the state in which the temperature detection device 33 is disposed on the slider 532. The temperature detection device 33 is the same as the temperature detection device 33 in the first embodiment described above.

[0226] Temperature sensor 33b detects the temperature of slider 532. That is, the temperature detected by temperature sensor 33b is equivalent to the temperature detected by temperature detection device 33.

[0227] Temperature sensor 33b is disposed on the main surface 33a2 of substrate 33a1. With temperature detection device 33 disposed on slider 532, temperature sensor 33b faces the outer surface F4 of slider 532. A space exists between temperature sensor 33b and the outer surface F4 of slider 532. This suppresses the transmission of vibration from slider 532 to temperature sensor 33b, thus preventing malfunctions of temperature sensor 33b.

[0228] Furthermore, when the slider 532 is viewed along a direction orthogonal to its sliding direction, the temperature sensor 33b overlaps with the circulation path Rc. In this third embodiment, when the slider 532 is viewed along the second direction D2, the temperature sensor 33b overlaps with the circulation path Rc.

[0229] Figure 14The temperature sensor 33b shown is positioned to overlap with the first circulation path Rc1 when the slider 532 is viewed along the second direction D2. The temperature sensor 33b can also overlap with the second circulation path Rc2 when the slider 532 is viewed along the second direction D2. Furthermore, the temperature sensor 33b can also be configured to overlap with the circulation path Rc when the slider 532 is viewed along the first direction D1.

[0230] Next, the operation of the mechanical device 530 when an abnormality occurs will be explained.

[0231] As described above, when the rolling element B circulates in the circulation path Rc, friction is generated between the circulation path Rc and the rolling element B. When the state of the mechanical device 530 changes due to friction, abnormalities such as damage to the rolling element B, guide rail 531, and sliding element 532 may occur. When this abnormality develops, failures such as seizing may occur.

[0232] Furthermore, if the state change of the mechanical device 530 caused by friction develops, the temperatures of the rolling element B, the guide rail 531, and the sliding member 532 will rise. When the sliding member 532 slides, the rolling element B continuously rolls in the first sliding groove Gs1, the second sliding groove Gs2, the first rolling path Rt1, and the second rolling path Rt2 that form the circulation path Rc in the sliding member 532. Therefore, the temperatures of the rolling element B and the sliding member 532 rise earlier than the temperature of the guide rail 531.

[0233] Furthermore, in the slider 532, the portion near the circulation path Rc is closer to the rolling element B than other portions. Therefore, in the slider 532, the temperature of the portion near the circulation path Rc rises earlier than the temperature of other portions.

[0234] Moreover, such as Figure 13 As shown, in the slider 532, the rolling element B rolls a longer distance on both sides of the second direction D2 compared to the parts on both sides of the first direction D1. Therefore, the temperature on both sides of the second direction D2 rises earlier than the temperature on both sides of the first direction D1.

[0235] As described above, when the slider 532 is observed along the second direction D2, the temperature sensor 33b is located at a position overlapping with the circulation path Rc. That is, when the slider 532 is observed along the second direction D2, the temperature sensor 33b overlaps with the portion of the slider 532 where the temperature rises earlier. Therefore, compared to the case where the temperature sensor 33b is located in other positions, the detected temperature of the temperature sensor 33b rises earlier.

[0236] As described above, the temperature detected by the temperature detection device 33 is stored in the control device 4 via the reader / writer 3. Furthermore, if the temperature detected by the temperature detection device 33 is above a predetermined temperature, the control device 4 determines that the mechanical device 530 is malfunctioning. Therefore, the temperature management system 1b can detect malfunctions in the mechanical device 530 at an early stage.

[0237] As described above, according to this embodiment, the mechanical device 530 includes: a guide rail 531; a slider 532 mounted on the guide rail 531 in a manner that allows it to slide relative to the guide rail 531; and an RFID tag 33a having a temperature sensor 33b that detects the temperature of the slider 532 and sends the detected temperature of the temperature sensor 33b to the reader 3. The mechanical device 530 also includes a rolling element B that rolls between the guide rail 531 and the slider 532. The slider 532 has a circulation path Rc for the rolling element B to circulate. When the slider 532 is viewed in a direction orthogonal to the sliding direction of the slider 532, the temperature sensor 33b overlaps with the circulation path Rc.

[0238] Therefore, even when the mechanical device 530 has a guide rail 531 and a slider 532 that is slidably (relatively movable) mounted on the guide rail 531, as described above, the structure of the mechanical device 530 can be simplified, and it can help to detect abnormalities of the mechanical device 530 earlier based on the temperature of the slider 532.

[0239] Furthermore, in the slider 532, the temperature of the portion in contact with the rolling element B rises earlier than the temperature of other portions. Therefore, the portion on the outer surface of the slider 532 where the temperature sensor 33b is located rises earlier in tandem with the temperature rise of the slider 532. Thus, the mechanical device 530 can reliably achieve early detection of anomalies through the temperature detected by the temperature sensor 33b.

[0240] Next, regarding the temperature management system 1b and mechanical device 530 of the modified embodiment of the present disclosure, the differences from the temperature management system 1b and mechanical device 530 of the third embodiment described above will be explained.

[0241] For example, mechanical equipment 505 can also be equipment (such as a machine tool) that includes mechanical device 530 instead of the XY worktable.

[0242] In addition, the number of sliders 532 installed on a guide rail 531 is not limited to two; it can also be one or more than three.

[0243] Alternatively, if components such as the worktable T are not fixed to the opposite surface S2 of the slider 532, the temperature detection device 33 can also be disposed on the opposite surface S2. In this case, the temperature sensor 33b can also be disposed in a state where it overlaps with the circulation path Rc when the slider 532 is observed along the third direction D3. Alternatively, when the slider 532 is observed along a direction orthogonal to the sliding direction of the slider 532, the temperature sensor 33b can also be disposed in a state where it does not overlap with the circulation path Rc.

[0244] <Fourth Implementation Method>

[0245] Next, regarding the temperature management system 1c and mechanical device 610 of the fourth embodiment of this disclosure, the differences from the temperature management system 1 of the first embodiment described above will be explained.

[0246] <Temperature Management System 1c and Mechanical Device 610>

[0247] Figure 16 This diagram illustrates the structure of a temperature management system 1c according to a fourth embodiment of the present disclosure. The temperature management system 1c includes a mechanical device 610, a first temperature detection device 620, a second temperature detection device 630, a reader / writer 3, and a control device 4. The reader / writer 3 and control device 4 are the same as those in the first embodiment described above.

[0248] Mechanical device 610 is a ball screw for moving an object T0. The object T0 is, for example, a mold of an injection molding machine, a spindle head of a machine tool, or a worktable of an XY table. Mechanical device 610 includes a screw shaft 611 (equivalent to a "first component" in the fourth embodiment), a nut 612 (equivalent to a "second component" in the fourth embodiment), and a plurality of balls 613.

[0249] The lead screw shaft 611 is a cylindrical shape extending along the central axis CL. The lead screw shaft 611 has a helical first groove 611a on its outer circumferential surface. The lead screw shaft 611 is connected to, for example, the output shaft of a motor and is rotated by the drive of the motor.

[0250] The nut 612 is fitted into the lead screw shaft 611 in a rotatable manner. The balls 613 in the nut 612 are circulated in a tubular manner. The nut 612 includes a main body 612a, a mounting member 612b, and multiple circulation members 612c.

[0251] The main body 612a is cylindrical and has a through hole 612a1 through which the lead screw shaft 611 passes. On the inner circumferential surface of the through hole 612a1, there is a spiral second groove 612a2 opposite to the first groove 611a of the lead screw shaft 611. The first groove 611a and the second groove 612a2 constitute a passage R for a plurality of balls 613.

[0252] Mounting member 612b is disposed on one end face of main body 612a. Lead screw 611 passes through mounting member 612b. Object T0 is mounted on mounting member 612b. Alternatively, mounting member 612b may be disposed on the side of main body 612a.

[0253] Figure 17 It is along Figure 16 The side view of the mechanical device 610 when viewed by arrow XVII. Figure 16 The arrow XVII shown extends radially along the lead screw shaft 611.

[0254] like Figure 16 , Figure 17 As shown, the circulation member 612c is tubular. The inner side of the circulation member 612c forms a passage R for the balls 613. Both ends of the circulation member 612c open at locations in different second grooves 612a2 extending along the central axis CL. Through the relative rotation of the lead screw 611 and the nut 612, multiple balls 613 circulate between the first groove 611a and the second groove 612a2 forming the passage R, and inside the circulation member 612c. Furthermore, grease is applied to the passage R to facilitate the circulation of the balls 613.

[0255] The nut 612 has multiple circulation members 612c. The number of circulation members 612c is 5, but is not limited to 5.

[0256] Furthermore, the circulation member 612c has a protrusion 612c1 that protrudes from the main body 612a. When the mechanical device 610 is viewed radially along the lead screw shaft 611, the protrusion 612c1 of the circulation member 612c is inclined relative to the central axis CL of the lead screw shaft 611. In addition, the protrusions 612c1 of a plurality of circulation members 612c are arranged along the central axis CL of the lead screw shaft 611.

[0257] Figure 18 It means Figure 16 A cross-sectional view of the first temperature detection device 620 shown. Figure 18 This shows the state in which the first temperature detection device 620 is configured on the lead screw shaft 611.

[0258] The first temperature detection device 620 is configured similarly to the temperature detection device 33 of the first embodiment described above. The first temperature detection device 620 includes: a first RFID tag 621 (equivalent to "RFID tag" in the fourth embodiment) including a substrate 621a, a first temperature sensor 622 (equivalent to "temperature sensor" in the fourth embodiment), a first cover member 623, and a first adhesive member 624. The substrate 621a, the first RFID tag 621, the first temperature sensor 622, the first cover member 623, and the first adhesive member 624 are configured similarly to the substrate 33a1, RFID tag 33a, temperature sensor 33b, cover member 33c, and adhesive member 33d in the temperature detection device 33 of the first embodiment described above. The first RFID tag 621 and the first temperature sensor 622 are integrally formed.

[0259] like Figure 16 , Figure 18 As shown, a first temperature detection device 620 is disposed on the end face F5 of the lead screw shaft 611. That is, a first RFID tag 621 is disposed on the end face F5 of the lead screw shaft 611. The first RFID tag 621 communicates wirelessly with the reader 3. A first temperature sensor 622 detects the temperature of the lead screw shaft 611.

[0260] In addition, the first RFID tag 621, similarly to the RFID tag 33a in the first embodiment described above, sends the identification information (e.g., identification number) of the identification device 610 corresponding to the temperature detected by the first temperature sensor 622, as well as the identification information of the first RFID tag 621, to the reader 3. The identification information is pre-stored in the first RFID tag 621 by the reader 3.

[0261] With the first temperature sensing device 620 attached to the end face F5 of the lead screw shaft 611, the first temperature sensor 622 faces the end face F5 of the lead screw shaft 611. There is a space between the first temperature sensor 622 and the end face F5 of the lead screw shaft 611. This suppresses the transmission of vibration from the lead screw shaft 611 to the first temperature sensor 622, thus preventing malfunctions of the first temperature sensor 622.

[0262] The second temperature detection device 630 is configured similarly to the first temperature detection device 620. The second temperature detection device 630 includes a second RFID tag 631 (equivalent to "second RFID tag": including substrate 631a) corresponding to the first RFID tag 621, a second temperature sensor 632 (equivalent to "second temperature sensor") corresponding to the first temperature sensor 622, a second cover member 633 corresponding to the first cover member 623, and a second adhesive member 634 corresponding to the first adhesive member 624. Substrate 631a corresponds to substrate 621a.

[0263] like Figure 16 , Figure 17 , Figure 18 As shown, a second temperature detection device 630 is disposed on the outer surface F6 of the main body 612a of the nut 612. A second adhesive member 634 adhesively attaches a second RFID tag 631 and a second cover member 633 to the outer surface F6 of the main body 612a of the nut 612. A second temperature sensor 632 is opposite to the outer surface F6 of the main body 612a. The second temperature sensor 632 detects the temperature of the nut 612. There is a space between the second temperature sensor 632 and the outer surface F6 of the main body 612a. Therefore, the transmission of vibration of the nut 612 to the second temperature sensor 632 can be suppressed, and malfunctions of the second temperature sensor 632 can be suppressed.

[0264] In addition, the temperature management system 1c includes multiple second temperature detection devices 630. The number of second temperature detection devices 630 is four, but not limited to four. For example... Figure 17 As shown, multiple second temperature detection devices 630 are arranged in a row along the central axis CL. Furthermore, each of the multiple second temperature detection devices 630 is disposed in the main body 612a between two adjacent protrusions 612c1. That is, multiple second RFID tags 631 are arranged in a row along the central axis CL. Furthermore, each of the multiple second RFID tags 631 is disposed in the main body 612a between two adjacent protrusions 612c1. The positions of the second temperature detection devices 630 are, of course, not limited to... Figure 16 , Figure 17 The location shown.

[0265] Furthermore, when viewed radially along the lead screw shaft 611, the second temperature sensors 632 of the plurality of second temperature sensing devices 630 overlap with the passage R of the ball bearings 613 of the nut 612. Specifically, when viewed radially along the lead screw shaft 611, the second temperature sensors 632 overlap with the second groove 612a2.

[0266] Figure 16 The reader 3 shown, like the first embodiment described above, wirelessly communicates with the first RFID tag 621 and the second RFID tag 631. The reader 3 can also communicate with the first RFID tag 621 and the second RFID tag 631 while the lead screw 611 is rotating.

[0267] In addition, similarly to the first RFID tag 621, the second RFID tag 631 sends the identification information (e.g., identification number) of the mechanical device 610 corresponding to the temperature detected by the second temperature sensor 632, as well as the identification information of the second RFID tag 631, to the reader 3. The identification information is pre-stored in the second RFID tag 631 by the reader 3.

[0268] The user operates the reader 3 to send carrier waves to the first RFID tag 621 and the second RFID tag 631. Correspondingly, the first RFID tag 621 sends its identification information and the temperature detected by the first temperature sensor 622 to the reader 3. Additionally, the second RFID tag 631 sends its identification information and the temperature detected by the second temperature sensor 632 to the reader 3.

[0269] The reader 3 acquires the identification information, the temperature detected by the first temperature sensor 622, and the temperature detected by the second temperature sensor 632, and sends them to the control device 4.

[0270] Control device 4 controls the rotation of the lead screw shaft 611 and the movement of the nut 612 by controlling the rotation of the motor. When the nut 612 rotates relative to the lead screw shaft 611, the balls 613 circulate between the lead screw shaft 611 and the nut 612. Through friction between the lead screw shaft 611 and the balls 613, and between the nut 612 and the balls 613, the temperatures of the lead screw shaft 611 and the nut 612 rise. Additionally, the nut 612 reciprocates relative to the lead screw shaft 611. Therefore, the temperature of the lead screw shaft 611 becomes approximately the same throughout the entire lead screw shaft 611.

[0271] The control device 4 acquires identification information, the detected temperature of the first temperature sensor 622, and the detected temperatures of multiple second temperature sensors 632 from the reader 3. The control device 4 stores the detected temperatures of the first temperature sensor 622 and the second temperature sensors 632 in a time sequence corresponding to each identification information in its internal storage. Furthermore, the control device 4 displays the detected temperatures of the first temperature sensor 622 and the second temperature sensors 632 in a display unit (e.g., a monitor) corresponding to each identification information.

[0272] In addition, the control device 4 calculates the temperature difference between the detected temperatures of the multiple second temperature sensors 632 and the detected temperature of the first temperature sensor 622. For example, when there is less grease in the passage R, the friction between the nut 612 and the ball 613 increases, and the temperature of the nut 612 becomes higher than the temperature of the lead screw shaft 611.

[0273] When the temperature difference between the lead screw shaft 611 and the nut 612 increases, the difference in thermal expansion between them also increases, narrowing the passage R of the ball bearing 613 between them. Consequently, the friction between the lead screw shaft 611 and the ball bearing 613, as well as between the nut 612 and the ball bearing 613, increases, potentially damaging the mechanical device 610. Damage to the mechanical device 610 will affect its lifespan.

[0274] Therefore, when the temperature difference between the temperature detected by the second temperature sensor 632 and the temperature detected by the first temperature sensor 622 is greater than or equal to a predetermined temperature difference, the control device 4 detects an abnormality in the mechanical device 610. The control device 4 also detects an abnormality in the mechanical device 610 when the temperature difference between at least one of the detected temperatures of the second temperature sensor 632 and the detected temperature of the first temperature sensor 622 is greater than or equal to a predetermined temperature difference. This predetermined temperature difference is, for example, determined to be a temperature difference that will not damage the mechanical device 610, and is pre-stored in the internal storage of the control device 4.

[0275] When the control device 4 detects an abnormality in the mechanical device 610, it displays the detected abnormality on a display unit (e.g., a monitor). At this time, the control device 4 displays the identification information of the second temperature sensor 632 whose temperature difference from the temperature detected by the first temperature sensor 622 is greater than or equal to a predetermined temperature difference. The user performs maintenance on the mechanical device 610 based on this display. For example, if the abnormality of the mechanical device 610 is insufficient lubricant, lubricant is applied. By periodically checking the detected temperatures of the first temperature sensor 622 and the second temperature sensor 632 using the reader / writer 3, the user can detect abnormalities in the mechanical device 610 at an early stage.

[0276] Furthermore, if the object T0 installed on the nut 612 has a heat source, even if the temperature difference between the detected temperature of the second temperature sensor 632 and the detected temperature of the first temperature sensor 622 is greater than a predetermined temperature difference due to the heat transfer from the heat source to the nut 612, the control device 4 will detect the abnormality of the mechanical device 610.

[0277] As described above, according to this embodiment, the mechanical device 610 includes: a lead screw 611; a nut 612, which is fitted into the lead screw 611 in a manner that allows relative rotation (relative movement); and a first RFID tag 621, which has a first temperature sensor 622 for detecting the temperature of the lead screw 611 and sends the detected temperature of the first temperature sensor 622 to the reader 3. Additionally, the mechanical device 610 also includes a second RFID tag 631, which has a second temperature sensor 632 for detecting the temperature of the nut 612 and sends the detected temperature of the second temperature sensor 632 to the reader 3.

[0278] Therefore, even when the mechanical device 610 has a lead screw 611 and a nut 612 that can be rotatably fitted into the lead screw 611, as described above, the structure of the mechanical device 610 can be simplified, and it can help to detect abnormalities of the mechanical device 610 earlier based on the temperature of the lead screw 611 and the temperature of the nut 612.

[0279] In addition, the control device 4 detects an abnormality in the mechanical device 610 when the temperature difference between the first temperature sensor 622 and the second temperature sensor 632 is greater than a specified temperature difference.

[0280] Therefore, the control device 4 wirelessly acquires the temperature of the lead screw 611 and the nut 612 via the first RFID tag 621, the second RFID tag 631, and the reader 3. Thus, even when the lead screw 611 is rotating, the control device 4 can easily acquire the temperature of the lead screw 611 and the nut 612. Therefore, the control device 4 can easily manage the temperature of the lead screw 611 and the nut 612.

[0281] Furthermore, for example, when the temperature of the nut 612 rises due to friction between the nut 612 and the ball 613, the temperature difference between the nut 612 and the lead screw shaft 611 becomes relatively large. Therefore, if the difference in thermal expansion between the nut 612 and the lead screw shaft 611 becomes large, the friction between the lead screw shaft 611 and the ball 613, as well as the friction between the nut 612 and the ball 613, becomes relatively large, potentially shortening the lifespan of the mechanical device 610. Therefore, the control device 4 detects an abnormality in the mechanical device 610 when the temperature difference between the lead screw shaft 611 and the nut 612 exceeds a specified temperature difference. Thus, the temperature management system 1c can prevent a shortened lifespan of the mechanical device 610.

[0282] In addition, the first RFID tag 621 is disposed on the end face F5 of the lead screw shaft 611.

[0283] Therefore, compared to the case where the first RFID tag 621 is disposed on the outer peripheral surface of the lead screw shaft 611, the centrifugal force acting on the first RFID tag 621 can be reduced. Thus, malfunctions of the first RFID tag 621 can be suppressed.

[0284] Additionally, the nut 612 includes a main body 612a with a through hole 612a1 through which the lead screw shaft 611 passes, and a plurality of circulation members 612c forming a passage for the ball bearing 613. Each of the plurality of circulation members 612c has a protrusion 612c1 protruding from the main body 612a. A second RFID tag 631 is disposed in the main body 612a at a position between two of the plurality of protrusions 612c1.

[0285] When the friction between the circulation component 612c and the ball bearing 613 becomes greater, the temperature of the circulation component 612c rises relatively earlier. Therefore, the second temperature sensor 632 of the second RFID tag 631 detects the temperature rise of the circulation component 612c earlier. Consequently, the temperature difference between the detection results of the first temperature sensor 622 and the second temperature sensor 632 increases earlier. Therefore, the temperature management system 1c can detect abnormalities in the mechanical device 610 at an early stage.

[0286] Furthermore, when viewed radially along the lead screw shaft 611, the second temperature sensor 632 overlaps with the passage R of the ball bearing 613 of the nut 612.

[0287] Therefore, when the temperature of the nut 612 rises due to friction between the ball 613 and the nut 612, the temperature of the nut 612 near the passage R of the ball 613 rises relatively earlier. Consequently, the second temperature sensor 632 detects the temperature rise of the nut 612 near the passage R of the ball 613 earlier. As a result, the temperature difference between the detected temperature of the first temperature sensor 622 and the detected temperature of the second temperature sensor 632 increases earlier. Therefore, the temperature management system 1c can detect abnormalities in the mechanical device 610 at an early stage.

[0288] In addition, the temperature management system 1c has multiple second RFID tags 631. The multiple second RFID tags 631 are arranged in a row along the central axis CL of the lead screw shaft 611.

[0289] Therefore, by moving the reader 3 along the central axis CL of the lead screw 611, the user can easily obtain the detected temperatures of multiple second temperature sensors 632. This allows for convenient management of the temperature of the nut 612.

[0290] In addition, the temperature management system 1c has a plurality of second RFID tags 631. When the temperature difference between the detection result of the second temperature sensor 632 of at least one of the plurality of second RFID tags 631 and the detection result of the first temperature sensor 622 is greater than a predetermined temperature difference, the control device 4 detects an abnormality in the mechanical device 610.

[0291] Therefore, even if there is an abnormality in a part of the mechanical device 610, the abnormality of the mechanical device 610 can be detected at an early stage.

[0292] Next, regarding the temperature management system 1c and mechanical device 610 of the fourth embodiment of this disclosure, the differences from the temperature management system 1c of the fourth embodiment described above will be explained.

[0293] For example, the control device 4 may detect an abnormality in the mechanical device 610 when the temperature difference between the average value of the detected temperatures of the multiple second temperature sensors 632 and the detected temperature of the first temperature sensor 622 is greater than a specified temperature difference.

[0294] Alternatively, the first temperature detection device 620 may be disposed on the circumferential side of the lead screw shaft 611.

[0295] Alternatively, the number of second temperature detection devices 630 can also be one.

[0296] Figure 19 This is a partial cross-sectional view along the central axis CL of the mechanical device 610 included in the temperature management system 1c, a variation of the fourth embodiment of this disclosure. Figure 20 It is along the mechanical device 610 Figure 19 The sectional view shown is along line XX-XX.

[0297] In this modified example, the nut 612 does not have a circulation member 612c. The circulation method of the balls 613 in the nut 612 in this modified example is block-type. Figure 19 , Figure 20 The first block portion 712d1, the second block portion 712d2, the third block portion 712d3, and the fourth block portion 712d4 are shown. When describing without distinguishing between the first block portion 712d1, the second block portion 712d2, the third block portion 712d3, and the fourth block portion 712d4, they are simply referred to as "block portion 712d".

[0298] The first block 712d1, the second block 712d2, the third block 712d3, and the fourth block 712d4 are arranged sequentially along the central axis CL. In addition, the first block 712d1, the second block 712d2, the third block 712d3, and the fourth block 712d4 are located at equal intervals around the central axis CL.

[0299] The block portion 712d has a block groove D opposite to the lead screw shaft 611 and capable of allowing the ball 613 to pass over the thread teeth of the lead screw shaft 611. The block grooves D of the first block portion 712d1, the second block portion 712d2, the third block portion 712d3, and the fourth block portion 712d4 are located at equal intervals in the circumferential direction of the lead screw shaft 611.

[0300] The ball 613 between the first groove 611a and the second groove 612a2 moves via the block groove D toward the first groove 611a adjacent to the first groove 611a in the direction along the central axis CL, thereby circulating the ball 613 within the nut 612.

[0301] In this variation, when viewed radially along the lead screw shaft 611, the second temperature sensing device 630 may be positioned at the location where the second temperature sensor 632 overlaps with the block groove D. Alternatively, when multiple second temperature sensing devices 630 are configured on the nut 612, when viewed along the central axis CL, the multiple second temperature sensing devices 630 may be positioned at different locations in the circumferential direction of the nut 612.

[0302] In addition, the ball bearings 613 in the nut 612 can also be circulated in an end-deflection type or an end-cap type.

[0303] Explanation of reference numerals in the attached figures

[0304] 1: Temperature management system; 3: Reader / writer; 4: Control device; 20: Mechanical device; 31: Shaft component (first component); 33a: RFID tag; 33b: Temperature sensor; 42: Bearing (second component); 402: Mechanical device; 431: Lead screw shaft (first component); 432: Nut (second component); 530: Mechanical device; 531: Guide rail (second component); 532: Sliding element (first component); 610: Mechanical device; 611: Lead screw shaft (first component); 612: Nut (second component) Components); 612a: Main body; 612a1: Through hole; 612b: Mounting component; 612c: Circulation component; 612c1: Protrusion; 613: Ball bearing; 621: First RFID tag; 622: First temperature sensor; 631: Second RFID tag; 632: Second temperature sensor; B: Rolling element; CL: Central axis; F1, F3, F5: End face; R: Passage; Rc: Circulation path.

Claims

1. A mechanical device comprising: First component; A second component, wherein the first component is mounted to the second component in a manner capable of relative movement; and An RFID tag having a temperature sensor that detects the temperature of the first component and sends the detected temperature to a reader.

2. The mechanical device according to claim 1, wherein, The first component is a shaft component. The second component is a bearing that supports the first component as a rotatable component. The temperature sensor is disposed on the end face of the first component.

3. The mechanical device according to claim 1, wherein, The first component is a lead screw shaft. The second component is a nut that can be rotatably fitted into the first component. The temperature sensor is disposed on the end face of the first component.

4. The mechanical device according to claim 1, wherein, The mechanical device also includes a plurality of rolling elements that roll between the first component and the second component. The second component is a guide rail. The first component is a slider mounted on the second component in a manner that allows it to slide relative to the second component. The first component has a circulation path for the rolling element to circulate. When the first component is viewed along a direction orthogonal to the sliding direction of the first component, the temperature sensor overlaps with the circulation path.

5. The mechanical device according to claim 1, wherein, The first component is a lead screw shaft. The second component is a nut that can be rotatably fitted into the first component. The mechanical device also includes a second RFID tag, which has a second temperature sensor that detects the temperature of the second component and sends the detected temperature of the second temperature sensor to a reader.

6. A temperature management system, comprising: The mechanical device as described in claim 1; The reader / writer; and A control device, which is electrically connected to the reader / writer, stores the temperature detected by the temperature sensor.

7. The temperature management system according to claim 6, wherein, The temperature management system has several of the aforementioned mechanical devices.

8. The temperature management system according to claim 6, wherein, The first component is a lead screw shaft. The second component is a nut that can be rotatably fitted into the first component. The control device controls the rotation of the first component and corrects the rotation of the first component based on the detection result of the temperature sensor.

9. The temperature management system according to claim 6, wherein, The first component is a lead screw shaft. The second component is a nut that can be rotatably fitted into the first component. The mechanical device also includes: Multiple balls, which circulate within the second component; and The second RFID tag has a second temperature sensor that detects the temperature of the second component and sends the detected temperature to the reader. The control device detects an abnormality in the mechanical device when the temperature difference between the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor is greater than a specified temperature difference.

10. The temperature management system according to claim 9, wherein, The RFID tag is disposed on the end face of the first component.

11. The temperature management system according to claim 9, wherein, The second component includes: a main body having a through hole through which the first component passes; and a plurality of circulating components forming a passageway for the ball bearings. Each of the plurality of said circulating components has a protrusion extending from the main body portion. The second RFID tag is disposed in the body portion at the location between two of the plurality of protrusions.

12. The temperature management system according to claim 9, wherein, When viewed radially along the first component, the second temperature sensor overlaps with the path of the ball bearings in the second component.

13. The temperature management system according to claim 9, wherein, The temperature management system has multiple second RFID tags. Multiple second RFID tags are arranged in a row along the central axis of the first component.

14. The temperature management system according to claim 9, wherein, The temperature management system has multiple second RFID tags. If the temperature difference between the detection result of the second temperature sensor of at least one of the second RFID tags and the detection result of the second temperature sensor is greater than a specified temperature difference, the control device detects an abnormality in the mechanical device.

Images