A bottom mold, a rotating device, and a rotation detecting device

Abstract

The utility model relates to the technical field of rotation detection, more particularly to a bottom mould, a rotating device and a rotation detection device. The bottom mould comprises a main body and first and second mounting portions coaxially arranged at the axial ends of the main body, the side surface of the main body is uniformly provided with a plurality of grooves in the circumferential direction, and the side surface of the main body is also uniformly provided with a plurality of connecting portions in the circumferential direction; the rotating device comprises a driving motor, a first connecting piece, a transmission structure connected between the driving motor and the first connecting piece, and the bottom mould, the first connecting piece is mounted and positioned with the second mounting portion, and the first connecting piece is fastened with the main body through the connecting portion; the rotation detection device comprises a non-contact distance measuring sensor and the rotating device. Even if the solution in the ampoule splashes onto the surface of the bottom mould, the real rotation state of the bottom mould can still be correctly judged, the missed detection of the non-rotated ampoule caused by the misjudgment of the rotation state is avoided, and the accuracy of detection and the qualified rate of products are effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of rotation detection, and more specifically, to a bottom mold, a rotation device, and a rotation detection device. Background Technology

[0002] For products packaged in ampoules, such as transparent or semi-transparent oral liquids and injections, strict impurity testing is required for each container before shipment to ensure drug quality and medication safety. Common impurities include solid foreign objects such as glass particles, aluminum shavings, rubber shavings, hair, and fibers. The detection principle for impurity testing is as follows: the ampoule is placed on a high-speed rotating platform, and centrifugal force is used to suspend and rotate impurities in the liquid inside the ampoule. An industrial camera then captures the image, and foreign objects are identified through image analysis.

[0003] For effective detection, the ampoule must be in a stable rotating state during imaging; otherwise, impurities may settle, leading to missed detections. In existing technologies, a rotation detection device is typically required to prevent missed detections due to the ampoule not rotating. A visual identifier with a specific pattern or color is affixed to the base mold that drives the ampoule's rotation. This identifier is then continuously photographed with a camera, and the sequence of images is compared and analyzed. If the position of the identifier changes within the consecutive images, the rotation is considered normal.

[0004] However, during the production process, ampoules may burst due to stress or other reasons, causing the solution inside to splash out. This splashed solution easily contaminates the visual markings on the bottom mold, making the pattern blurry, incomplete, or covered. This contamination severely interferes with the accuracy of image comparison and analysis algorithms, causing the system to be unable to correctly determine the true rotation state of the bottom mold. It may misjudge a stationary state that is unrecognizable due to contamination as rotation, or vice versa. This misjudgment can lead to missed inspections of non-rotating ampoules, allowing defective products containing impurities to enter the market, affecting product qualification rates and production safety. Utility Model Content

[0005] The purpose of this invention is to overcome the problem of missed detection caused by misjudgment of rotation state in the prior art, and to provide a bottom mold, a rotation device and a rotation detection device, which can effectively avoid missed detection of visual markings due to contamination, improve the accuracy of detection and the pass rate of products.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A bottom mold is provided, including a main body and a first mounting part and a second mounting part disposed at both ends of the main body along the axial direction. The main body, the first mounting part and the second mounting part are coaxially arranged. The side of the main body is uniformly provided with a plurality of grooves along the circumferential direction. The side of the main body is also uniformly provided with a plurality of connecting parts along the circumferential direction.

[0007] The bottom mold of this utility model has a first mounting part for mounting the ampoule, a second mounting part for mounting and positioning the rotating component, and a connecting part for fastening the rotating component and the bottom mold. The main body, the first mounting part, and the second mounting part are coaxially arranged to ensure stable rotation of the ampoule. A groove is provided to replace visual markings for detecting the rotation status. Even if the solution inside the ampoule splashes onto the surface of the bottom mold, the rotation status of the bottom mold can still be accurately detected. This allows for a correct judgment of the true rotation status of the bottom mold, avoiding the missed detection of non-rotating ampoules due to misjudgment of the rotation status, and effectively improving the accuracy of detection and the product qualification rate.

[0008] Furthermore, the groove includes a bottom surface and two opposite sides of the bottom surface. The bottom surface is a first planar structure, and the wall surface is a second planar structure. The first planar structure and the second planar structure are perpendicular to each other, and the second planar structure is perpendicular to the central axis of the main body. Since both the bottom and wall surfaces of the groove are planar, it is easy to process and also facilitates the modification of traditional bottom molds, thus reducing processing or modification costs.

[0009] Furthermore, the first mounting part is a first annular mounting step located on the top of the main body, and the peripheral side of the first annular mounting step is a guide surface. The first annular mounting step is used to mount ampoules. The guide surface facilitates the accurate installation of the ampoule into the first annular mounting step and prevents the ampoule from rubbing against the wall of the first annular mounting step during high-speed rotation.

[0010] Furthermore, the second mounting part is a second annular mounting step located at the bottom of the main body; the connecting part is a connecting hole, the axial direction of which is radial to the main body. The second annular mounting step is used for the mounting and positioning of the rotating component, ensuring that the rotation axis of the rotating component is collinear with the central axis of the bottom mold; the connecting hole facilitates connection, simplifies operation, and ensures stable connection; setting the connecting hole radially along the main body further improves the connection stability between the bottom mold and the rotating component.

[0011] This utility model also provides a rotating device, including a drive motor, a first connecting member, a transmission structure connected between the drive motor and the first connecting member, and a bottom mold as described above. The first connecting member is installed and positioned with the second mounting part, and the first connecting member is fastened to the main body through the connecting part.

[0012] The rotating device of this utility model transmits the power of the drive motor to the first connecting member through the transmission structure. The first connecting member is fastened to the bottom mold as the aforementioned rotating component, thereby transmitting the power to the bottom mold to drive the bottom mold to rotate the ampoule. The centrifugal force and disturbance generated by the rotation are used to fully disperse the drug residue and precipitate in the solution, avoiding their aggregation and affecting the identification of foreign objects at the rotation state detection station.

[0013] Furthermore, it also includes a crimping device that can rotate around its own axis. The crimping device is coaxially arranged with the first mounting part, and the ampoule is crimped and fixed between the crimping device and the first mounting part. By using the crimping device to crimp and fix the ampoule to the bottom mold, the ampoule can be in a stable rotational state, and can be removed after the rotation state detection is completed, allowing the ampoule to quickly enter the next process.

[0014] Furthermore, the transmission structure includes a driving pulley, a double-sided toothed synchronous belt, and several driven pulleys. The driving pulley is connected to the output end of the drive motor. The double-sided toothed synchronous belt wraps around the outer periphery of the driving pulley and the driven pulleys, with some of the driven pulleys located on the outer side of the double-sided toothed synchronous belt. The driven pulleys are fixedly connected to the bottom of the first connecting member. The double-sided toothed synchronous belt allows one driving pulley to drive multiple driven pulleys to rotate simultaneously, thereby saving equipment costs and installation space for the drive motor and transmission structure.

[0015] Furthermore, the drive motor is mounted on a motor bracket, which has several elongated holes. The drive motor is mounted within these elongated holes via a second connector. The elongated holes are provided to adjust the mounting position of the drive motor on the motor bracket as needed.

[0016] This utility model also provides a rotation detection device, including a non-contact ranging sensor and a rotation device as described above. The outer peripheral surface of the main body between the upper and lower end faces of the groove is the detection surface, and the non-contact ranging sensor emits energy waves toward the detection surface.

[0017] This invention relates to a rotation detection device. A non-contact distance sensor emits energy waves towards the detection surface. The energy waves reflected from the detection surface are received by the non-contact distance sensor, thus establishing the distance between the detection surface and the sensor. If the distance remains unchanged, the ampoule's rotation is abnormal; if the distance changes periodically, the ampoule rotates normally. This rotation detection device determines the rotation state by non-contactly measuring changes in distance, effectively preventing the missed detection of non-rotating ampoules and improving product qualification rates. Furthermore, it facilitates the modification of existing rotation detection devices, effectively reducing production or modification costs.

[0018] Furthermore, the non-contact ranging sensor is a laser photoelectric sensor. Laser photoelectric sensors are low in cost and provide accurate and reliable detection results.

[0019] Compared with the prior art, the beneficial effects of this utility model are: The bottom mold of this invention uses grooves to replace visual markings for detecting rotation status. Even if the solution inside the ampoule splashes onto the surface of the bottom mold, the rotation status of the bottom mold can still be accurately detected. This allows for a correct judgment of the true rotation status of the bottom mold, avoiding the missed detection of non-rotating ampoules due to misjudgment of rotation status, and effectively improving the accuracy of detection and the product qualification rate.

[0020] The rotating device of this utility model uses a pressing device to press and fix the ampoule onto the bottom mold. This allows the ampoule to be in a stable rotating state, and it can also be removed after the rotation state detection is completed, so that the ampoule can quickly enter the next process. One drive motor can drive multiple bottom molds to rotate at the same time, thereby saving equipment costs and saving installation space for drive motors and transmission structures.

[0021] The rotation detection device of this utility model determines the rotation state by measuring the change in distance in a non-contact manner. This not only effectively avoids missing non-rotating ampoules and improves the product qualification rate, but also facilitates the modification of existing rotation detection devices, effectively reducing production costs or modification costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the bottom mold structure in Example 1; Figure 2 This is a structural schematic diagram of the bottom mold from another perspective in Example 1; Figure 3 This is a schematic diagram of the rotating device in Embodiment 2; Figure 4 This is a schematic diagram of the rotation detection device in Example 3; In the attached drawings: 100, bottom mold; 110, main body; 120, first mounting part; 121, guide surface; 130, second mounting part; 140, groove; 141, first planar structure; 142, second planar structure; 150, connecting part; 160, boss; 210, drive motor; 220, first connecting piece; 230, transmission structure; 231, driving wheel; 232, driven wheel; 233, double-sided toothed synchronous belt; 234, meshing teeth; 240, motor bracket; 241, elongated hole; 250, second connecting piece; 300, non-contact ranging sensor; 400, crimping device; 500, ampoule. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0025] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] Example 1 This embodiment is an example of a bottom mold 100, including a main body 110 and a first mounting portion 120 and a second mounting portion 130 disposed at both axial ends of the main body 110. The main body 110, the first mounting portion 120, and the second mounting portion 130 are coaxially arranged. A plurality of grooves 140 are evenly provided circumferentially on the side surface of the main body 110, and a plurality of connecting portions 150 are also evenly provided circumferentially on the side surface of the main body 110. Figure 1 , Figure 2 As shown. In this embodiment, the main body 110, the first mounting part 120, the second mounting part 130, and the groove 140 are an integral structure, and the first mounting part 120, the second mounting part 130, and the groove 140 are all structures formed in the main body 110. In this embodiment, the ampoule 500 is installed through the first mounting part 120, and the rotating component is installed and positioned through the second mounting part 130. The rotating component and the bottom mold 100 are fastened together through the connecting part 150. The main body 110, the first mounting part 120, and the second mounting part 130 are coaxially arranged to ensure the stable rotation of the ampoule 500.

[0027] Specifically, in this embodiment, the groove 140 includes a bottom surface and two opposite sides of the bottom surface. The bottom surface is a first planar structure 141, and the wall surface is a second planar structure 142. The first planar structure 141 and the second planar structure 142 are perpendicularly arranged, and the second planar structure 142 is perpendicular to the central axis of the main body 110. Figure 1 , 2As shown. In this embodiment, the groove 140 is specifically designed to be three. It should be noted that the number and specific shape of the groove 140 are preferred options to reduce production or modification costs, and are not intended to limit the scope of protection of this utility model. The detection conditions for rotation state detection can be met by changing the distance from the circumferential side of the main body 110 to the axis of rotation.

[0028] In this embodiment, if a new bottom mold 100 is to be manufactured, the first planar structure 141 and the second planar structure 142 can be machined on the outer periphery of the cylindrical body 110 through a simple cutting or milling process, and the manufacturing process is simple. If the existing bottom mold 100 with visual markings pasted on its surface is modified and the visual markings are removed, the first planar structure 141 and the second planar structure 142 can also be machined on the outer periphery of the cylindrical body 110 through a simple cutting or milling process, and the modification cost is low, which has good economy and universality.

[0029] In this embodiment, the first mounting part 120 is a first annular mounting step located on the top of the main body 110, and the peripheral side surface of the first annular mounting step is a guide surface 121, such as... Figure 1 As shown. The distance between the guide surface 121 and the axis of the main body 110 gradually decreases from top to bottom; a boss 160 is provided on the top of the main body 110, and the first annular mounting step is specifically provided on the boss 160. Furthermore, in this embodiment, the main body 110 has an internal hollow structure, and the diameter of the boss 160 is smaller than the diameter of the main body 110. The boss 160 saves on the production cost of the bottom mold 100, and the bottom mold 100 has an aesthetically pleasing appearance and a smooth surface, thereby reducing the risk of breakage caused by collision between the ampoule 500 and the bottom mold 100. In this embodiment, the first annular mounting step is used to install the ampoule 500. The guide surface 121 facilitates the accurate installation of the ampoule 500 into the first annular mounting step and avoids friction between the high-speed rotation of the ampoule 500 and the first annular mounting step.

[0030] In addition, in this embodiment, the second mounting part 130 is a second annular mounting step provided at the bottom of the main body 110, such as Figure 2As shown. The upper and lower sides of the second annular mounting step have cylindrical holes of different diameters. The diameter of the upper cylindrical hole is smaller than that of the lower cylindrical hole. Correspondingly, the rotating component has a cylindrical positioning part that matches the upper and lower cylindrical holes. When the cylindrical positioning part is inserted into the cylindrical hole, under the action of the second annular mounting step, the radial and axial positioning between the rotating component and the bottom mold 100 can be completed, so that the rotation axis of the rotating component is collinear with the central axis of the bottom mold 100. The connecting part 150 is a connecting hole, and the axis of the connecting hole is the radial direction of the main body 110. Specifically, in this embodiment, the connecting hole is a threaded hole, and the cylindrical positioning part is also provided with a threaded hole. The two threaded holes are fastened together by a threaded connector, which is simple to operate and has a stable connection.

[0031] In this embodiment, the groove 140 is used to replace the visual mark for detecting the rotation status. Even if the solution in the ampoule 500 splashes onto the surface of the bottom mold 100, the rotation status of the bottom mold 100 can still be accurately detected. The true rotation status of the bottom mold 100 can be correctly judged, avoiding the missed detection of non-rotating ampoules due to misjudgment of the rotation status, and effectively improving the accuracy of detection and the pass rate of products.

[0032] Example 2 This embodiment is an example of a rotating device, including a drive motor 210, a first connecting member 220, a transmission structure 230 connecting the drive motor 210 and the first connecting member 220, and a bottom mold 100 as in Embodiment 1. The first connecting member 220 is installed and positioned with the second mounting part 130, and the first connecting member 220 is fastened to the main body 110 through a connecting part 150. Figure 3 As shown. In this embodiment, the power of the drive motor 210 is transmitted to the first connector 220 through the transmission structure 230. The first connector 220, as the aforementioned rotating component, is securely connected to the bottom mold 100, thereby transmitting power to the bottom mold 100 to drive it to rotate, thus providing the prerequisite for detecting the rotation state of the ampoule. In this embodiment, the transmission structure 230 can specifically be a belt drive, chain drive, gear drive, or other structure that can transmit the power of the drive motor 210 to the first connector 220.

[0033] To ensure the ampoule 500 remains in a stable rotational state for sufficient dispersion of precipitates within the oral liquid, the rotating device in this embodiment further includes a pressing device 400 that can rotate around its own axis. The pressing device 400 is coaxially arranged with the first mounting part 120, and the ampoule is pressed and fixed between the pressing device 400 and the first mounting part 120. Any device capable of maintaining axial height while rotating can be used in the pressing device of this invention. In this embodiment, the pressing device 400 is used to press and fix the ampoule 500 onto the bottom mold 100, which not only ensures the ampoule 500 remains in a stable rotational state but also allows for rapid loading and unloading of the ampoule 500 to the testing station via the lifting and lowering of the pressing device 400.

[0034] To enable one driving wheel 231 to drive multiple driven wheels 232 to rotate simultaneously, thereby saving equipment costs and installation space for the drive motor 210 and transmission structure 230, the transmission structure 230 in this embodiment is a belt drive structure, and the transmission belt is a double-sided toothed synchronous belt 233. Specifically, in this embodiment, the transmission structure 230 includes a driving wheel 231, a double-sided toothed synchronous belt 233, and several driven wheels 232. The driving wheel 231 is connected to the output end of the drive motor 210, the double-sided toothed synchronous belt 233 is wrapped around the outer periphery of the driving wheel 231 and the driven wheels 232, and some of the driven wheels 232 are located on the outside of the double-sided toothed synchronous belt 233. The driven wheels 232 are fixedly connected to the bottom of the first connecting member 220. More specifically, in this embodiment, there is one driving wheel 231 and four driven wheels 232. The four driven wheels 232 are arranged in a regular pattern. The first and last driven wheels 232 are located inside the double-sided toothed synchronous belt 233, and the two middle driven wheels 232 are located outside the double-sided toothed synchronous belt 233. To improve the stability of the transmission, in this embodiment, each driven wheel 232 has meshing teeth 234 on its outer periphery that cooperate with the surface teeth of the double-sided toothed synchronous belt 233. At least the outer periphery of the two middle driven wheels 232 has meshing teeth 234, such as... Figure 3 As shown.

[0035] To facilitate accurate installation of the drive motor 210, in this embodiment, the drive motor 210 is mounted on a motor bracket 240. The motor bracket 240 has several elongated holes 241. The drive motor 210 is mounted in the elongated holes 241 through a second connector 250. The second connector 250 slides in different positions within the elongated holes 241, thereby allowing the installation position of the drive motor 210 on the motor bracket 240 to be adjusted as needed.

[0036] Example 3 This embodiment is an example of a rotation detection device, including a non-contact ranging sensor 300 and a rotation device as shown in Embodiment 2. The outer peripheral surface of the main body 110 between the upper and lower end faces of the groove 140 is the detection surface. The non-contact ranging sensor 300 emits energy waves toward the detection surface, such as... Figure 4 As shown. Energy waves can be specifically categorized as light waves, sound waves, electromagnetic waves, and other energy waves.

[0037] In this embodiment, the non-contact ranging sensor 300 emits energy waves toward the detection surface. The energy waves reflected from the detection surface are received by the non-contact ranging sensor 300, thus determining the distance between the detection surface and the non-contact ranging sensor 300. If the distance does not change, the ampoule 500 is rotating abnormally; if the distance changes periodically, the ampoule 500 is rotating normally. This embodiment determines the rotation state by measuring changes in distance non-contactly, effectively avoiding missed detection of non-rotating ampoules and improving product qualification rate. Furthermore, it facilitates the modification of existing rotation detection devices, effectively reducing production or modification costs.

[0038] Specifically, in this embodiment, the non-contact ranging sensor 300 is a laser photoelectric sensor. The laser emitted by the laser photoelectric sensor points radially towards the detection surface along the base mold 100, and can detect the distance between the laser photoelectric sensor and the irradiation point in real time. This distance is compared with a preset threshold; if the distance is less than the threshold, it outputs 1; if it is greater than the threshold, it outputs 0, or vice versa, thus outputting a 0 or 1 switching state. It should be noted that the process of obtaining the distance signal using the laser photoelectric sensor, and the output of the distance signal as a 0 or 1 switching state, are conventional functions of the laser photoelectric sensor and do not involve any improvement to the computer program or data processing method.

[0039] During the rotation of the bottom mold 100, the groove 140 on its surface rotates synchronously with the bottom mold 100. When the groove 140 rotates to below the irradiation point of the laser photoelectric eye, the distance detected by the laser photoelectric eye changes due to the depth of the groove 140, causing its output state to switch alternately between 0 and 1, which can determine whether the bottom mold 100 is in a normal rotation state. When the output state of the laser photoelectric eye remains unchanged, it can be determined that the rotation of the bottom mold 100 is abnormal, and an alarm prompt can be sent to the relevant personnel.

[0040] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A bottom mold (100), characterized in that, The device includes a main body (110) and a first mounting portion (120) and a second mounting portion (130) disposed at both ends of the main body (110) along the axial direction. The main body (110), the first mounting portion (120) and the second mounting portion (130) are coaxially arranged. The side of the main body (110) is uniformly provided with a plurality of grooves (140) along the circumferential direction. The side of the main body (110) is also uniformly provided with a plurality of connecting portions (150) along the circumferential direction.

2. The bottom mold (100) according to claim 1, characterized in that, The groove (140) includes a bottom surface and two opposite sides of the bottom surface. The bottom surface is a first planar structure (141), and the wall surface is a second planar structure (142). The first planar structure (141) and the second planar structure (142) are arranged perpendicularly, and the second planar structure (142) is perpendicular to the central axis of the main body (110).

3. The bottom mold (100) according to claim 1, characterized in that, The first mounting part (120) is a first annular mounting step provided on the top of the main body (110), and the peripheral side surface of the first annular mounting step is a guide surface (121).

4. The bottom mold (100) according to any one of claims 1 to 3, characterized in that, The second mounting part (130) is a second annular mounting step provided at the bottom of the main body (110); the connecting part (150) is a connecting hole, and the axial direction of the connecting hole is the radial direction of the main body (110).

5. A rotating device, characterized in that, The device includes a drive motor (210), a first connector (220), a transmission structure (230) connecting the drive motor (210) and the first connector (220), and a bottom mold (100) as claimed in any one of claims 1 to 4. The first connector (220) is installed and positioned with the second mounting part (130), and the first connector (220) is fastened to the main body (110) through the connecting part (150).

6. The rotating device according to claim 5, characterized in that, It also includes a crimping device (400) that can rotate around its own axis, the crimping device (400) being coaxially arranged with the first mounting part (120), and the ampoule (500) being crimped and fixed between the crimping device (400) and the first mounting part (120).

7. The rotating device according to claim 5, characterized in that, The transmission structure (230) includes a drive wheel (231), a double-sided toothed synchronous belt (233), and a plurality of driven wheels (232). The drive wheel (231) is connected to the output end of the drive motor (210). The double-sided toothed synchronous belt (233) is wrapped around the outer periphery of the drive wheel (231) and the driven wheels (232), and some of the driven wheels (232) are located on the outside of the double-sided toothed synchronous belt (233). The driven wheels (232) are fixedly connected to the bottom of the first connecting member (220).

8. The rotating device according to any one of claims 5 to 7, characterized in that, The drive motor (210) is mounted on the motor bracket (240), which has several elongated holes (241). The drive motor (210) is mounted in the elongated holes (241) through the second connector (250).

9. A rotation detection device, characterized in that, Includes a non-contact ranging sensor (300) and a rotating device as described in any one of claims 5 to 8, wherein the outer peripheral surface of the main body (110) between the upper and lower end faces of the groove (140) is a detection surface, and the non-contact ranging sensor (300) emits energy waves toward the detection surface.

10. The rotation detection device according to claim 9, characterized in that, The non-contact ranging sensor (300) is a laser photoelectric sensor.

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