Sensor switch frequency measuring jig

Abstract

This utility model discloses a sensor switching frequency measuring fixture, belonging to the field of sensor technology. It includes a base plate, a first support frame mounted on the base plate, a driver mounted on the first support frame, a toothed turntable, and a second support frame slidably disposed on the base plate. The turntable is connected to the rotating shaft of the driver, and the driver drives the rotating shaft to rotate the turntable. The second support frame is used for detachably mounting a sensor, and the second support frame drives the sensor to move towards or away from the turntable, with the sensor's sensing surface facing the turntable. This utility model achieves the technical effects of improving measurement efficiency and enhancing reliability.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and specifically relates to a sensor switching frequency measuring fixture. Background Technology

[0002] Proximity sensors are widely used in industrial automation, security monitoring, and other fields. The switching frequency of a proximity sensor is one of the key indicators for measuring its response speed and reliability. In existing technologies, a motor typically drives a disk with multiple shielding plates. After starting the motor, the rotation speed is gradually increased. When a shielding plate enters the sensor's detection area, the sensor's output signal changes, and a frequency meter records the number of actions per unit time. The value directly displayed by the frequency meter can be used as the sensor's operating frequency. However, the sensor, motor, and disk are all fixedly mounted on a base, and the position between the sensor and the disk is fixed, making it difficult to accurately adjust the sensing distance between them. This is time-consuming and inefficient in the measurement of large batches of sensors of different specifications. Furthermore, during high-frequency switching tests, the vibrations generated by the motor and the rotating disk are transmitted throughout the entire structure, severely affecting the stability of the sensor signal and the measurement accuracy, resulting in poor reliability.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above-mentioned technical problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is the problem of low measurement efficiency and poor reliability.

[0005] To solve the above-mentioned technical problems, this utility model provides a sensor switching frequency measuring fixture. The sensor switching frequency measuring fixture includes a base plate, a first support frame mounted on the base plate, a driver mounted on the first support frame, a turntable with toothed grooves, and a second support frame slidably disposed on the base plate. The turntable is connected to the rotating shaft of the driver, and the driver drives the rotating shaft to rotate the turntable. The second support frame is used for detachably mounting the sensor, and the second support frame drives the sensor to move in a direction closer to or away from the turntable, with the sensing surface of the sensor facing the turntable.

[0006] Optionally, the sensor switching frequency measuring fixture further includes a linear guide rail fixed to the base plate and a slider slidably connected to the linear guide rail. The slider is fixedly connected to the second support frame, and the slider drives the second support frame to move along the linear guide rail toward or away from the turntable.

[0007] Optionally, the second support frame includes a frame body fixedly connected to the slider, a mounting slot formed in the frame body, and fasteners. The mounting slot is used to place the sensor; the fasteners extend through the frame body into the mounting slot and abut against the sensor.

[0008] Optionally, the sensor switching frequency measuring fixture further includes a mounting block that matches the mounting slot. The mounting block has a limiting slot that matches the sensor. The sensor is embedded in the limiting slot. When the mounting block is inserted into the mounting slot, the fastener extends through the frame into the mounting slot and abuts against the mounting block to press and fix the mounting block.

[0009] Optionally, the central axis of the limiting groove is parallel to the central axis of the mounting groove, and the central axis of the mounting groove is parallel to the rotating shaft.

[0010] Optionally, the sensor switching frequency measuring fixture further includes a controller mounted on the base plate, the controller being electrically connected to the driver to adjust the rotational speed of the driver.

[0011] Optionally, the turntable includes a disc body connected to the rotating shaft, and a plurality of protruding teeth evenly arranged along the outer periphery of the disc body, with a tooth groove provided between two adjacent protruding teeth, and the sensing surface of the sensor facing the protruding teeth or the tooth groove.

[0012] Optionally, the spacing between two adjacent protrusions is 37 mm to 39 mm; when viewed in the radial direction of the disc, the depth of the protrusion is 18.5 mm to 19.5 mm.

[0013] Optionally, when viewed in a direction perpendicular to the radial direction of the disk body, the width of the protrusion is 18.5 mm to 19.5 mm; when viewed in a direction perpendicular to the plane on which the disk body is located, the thickness of the disk body is 2.9 mm to 3.1 mm.

[0014] Optionally, the sensor switching frequency measuring fixture further includes a protective cover that surrounds the driver, the turntable, the first support frame, and the second support frame.

[0015] Beneficial effects:

[0016] This invention provides a sensor switching frequency measuring fixture. A first support frame is mounted on a base plate, and a driver is mounted on the first support frame. A turntable is connected to the driver's shaft, which drives the turntable to rotate. A second support frame is slidably mounted on the base plate and is used for detachably mounting the sensor. The second support frame moves the sensor closer to or further away from the turntable, with the sensor's sensing surface facing the turntable. During measurement, by pushing the second support frame to the desired position on the base plate, the distance between the sensor's sensing surface and the turntable can be adjusted to accommodate different installation distance requirements, quickly completing the sensing distance adjustment, improving measurement flexibility, and shortening measurement time. Furthermore, the driver drives the turntable to rotate, and the toothed grooves periodically sweep across the sensor's sensing surface, causing the sensor to output pulse signals. The areas on the turntable with and without toothed grooves cause the sensor to alternately output two switching states. By slowly changing the turntable's rotation speed, the sensor's switching frequency can be accurately measured. By recording the number of pulses per unit time, the sensor's switching frequency can be deduced, achieving efficient and highly reliable measurement. By mounting the driver on the base plate via the first support frame and the sensor via the second support frame, vibration transmission from the high-speed rotation of the driver and turntable can be suppressed, operational jitter reduced, and test consistency improved. This achieves the technical effect of improving measurement efficiency and enhancing reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a sensor switching frequency measuring fixture provided in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the linear guide rail and slider in a sensor switching frequency measuring fixture provided for an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the driver, rotating shaft, turntable and frame in a sensor switching frequency measuring fixture provided for an embodiment of this utility model. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0022] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] In the embodiments of this application, "at least one" refers to one or more; "multiple" refers to two or more. In the description of this application, the terms "first," "second," "third," etc., are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0024] In this specification, references such as "one embodiment" or "some embodiments" mean that one or more embodiments of this application include the specific features, structures, or characteristics described in connection with that embodiment. Therefore, the terms "comprising," "including," "having," and variations thereof in this specification all mean "including but not limited to," unless otherwise specifically emphasized. It should be noted that in the embodiments of this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0025] It should be noted that, in the embodiments of this utility model, when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intervening component. Furthermore, in the embodiments of this application, "connection" can also be understood as an electrical connection; the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. The terms "vertical," "horizontal," "left," "right," and similar expressions used in the embodiments of this utility model are for illustrative purposes only and are not intended to limit the utility model.

[0026] This utility model provides a sensor switching frequency measuring fixture. Please refer to [link to relevant documentation]. Figures 1 to 3 As shown, Figure 1 This is a schematic diagram of the structure of a sensor switching frequency measuring fixture provided in an embodiment of this utility model. Figure 2 This is a schematic diagram of the linear guide and slider in a sensor switching frequency measuring fixture provided by an embodiment of this utility model. Figure 3 This is a schematic diagram of the structure of a sensor switching frequency measuring fixture provided in this embodiment of the present invention, including a driver, a rotating shaft, a turntable, and a frame. The sensor switching frequency measuring fixture provided in this embodiment of the present invention includes a base plate 1, a first support frame 2, a driver 3, a turntable 4, and a second support frame 5. The first support frame 2 is mounted on the base plate 1, and the driver 3 is mounted on the first support frame 2. The turntable 4 has a toothed groove 41 and is connected to the rotating shaft 31 of the driver 3. The driver 3 drives the rotating shaft 31 to rotate the turntable 4. The second support frame 5 is slidably mounted on the base plate 1 and is used for detachably mounting a sensor 10. The second support frame 5 drives the sensor 10 to move in a direction closer to or further away from the turntable 4. The sensing surface of the sensor 10 faces the turntable 4, and the sensor 10 can be a proximity sensor.

[0027] The base plate 1 may include a rectangular metal plate, such as a square iron block with a thickness of 15mm. The driver 3 includes a motor or a cylinder. The first support frame 2 can be fixed to the base plate 1 by welding or bolting. The driver 3 may be a brushless motor, with the motor shaft 31 connected to the turntable 4. The speed of the driver 3 can be adjusted by an external controller 9, such as a PLC system, to achieve precise control of the rotation speed of the turntable 4.

[0028] The turntable 4 can be made of aluminum alloy. Multiple rectangular grooves 41 are evenly distributed along the edge of the turntable 4, with the grooves 41 and non-grooved areas alternating, creating a periodic gap change with each rotation. The bottom of the second support frame 5 can be matched with the guide rail of the base plate 1 via a slider 7, enabling linear sliding by manual pushing or pneumatic control. The sensor 10 can be detachably mounted on the upper end of the second support frame 5 via a threaded hole or quick-clamping device, ensuring that the sensing surface of the sensor 10 always faces the surface of the grooves 41 or non-grooved areas of the turntable 4 during movement. During testing, adjusting the position of the second support frame 5 changes the distance between the sensing surface and the turntable 4, adapting to different sensor 10 installation requirements. The driver 3 drives the turntable 4 to rotate at a constant speed, and the grooves 41 periodically sweep across the sensing surface, triggering the sensor 10 to output a pulse signal.

[0029] In this embodiment, a first support frame 2 is mounted on a base plate 1, a driver 3 is mounted on the first support frame 2, and a turntable 4 is connected to the rotating shaft 31 of the driver 3. The driver 3 drives the rotating shaft 31 to rotate the turntable 4. A second support frame 5 is slidably mounted on the base plate 1. The second support frame 5 is used to detachably mount the sensor 10. The second support frame 5 moves the sensor 10 towards or away from the turntable 4, with the sensing surface of the sensor 10 facing the turntable 4. During measurement, by pushing the second support frame 5 to slide on the base plate 1 to the desired position, the distance between the sensing surface of the sensor 10 and the turntable 4 can be adjusted to adapt to different installation distance requirements, quickly completing the sensing distance adjustment, improving measurement flexibility, and shortening measurement time. Furthermore, as the driver 3 rotates the turntable 4, the toothed groove 41 periodically sweeps across the sensing surface of the sensor 10, causing the sensor 10 to output a pulse signal. Subsequently, the areas on the turntable 4 that are located in the toothed groove 41 and those that are not in the toothed groove 41 cause the sensor 10 to alternately output two switching states. By slowly changing the rotation speed of the turntable 4, the switching frequency of the sensor 10 can be accurately measured. By recording the number of pulses per unit time, the switching frequency of the sensor 10 can be deduced, achieving efficient and highly reliable measurement. Mounting the driver 3 on the base plate 1 via the first support frame 2 and the sensor 10 via the second support frame 5 can suppress the vibration transmission of the high-speed rotation of the driver 3 and the turntable 4, reduce operational jitter, and improve test consistency. This achieves the technical effect of improving measurement efficiency and enhancing reliability.

[0030] As one embodiment, the sensor switching frequency measuring fixture provided in this utility model also includes a linear guide rail 6 and a slider 7. The linear guide rail 6 is fixed on the base plate 1, the slider 7 is slidably connected to the linear guide rail 6, and the slider 7 is fixedly connected to the second support frame 5. The slider 7 drives the second support frame 5 to move along the linear guide rail 6 towards or away from the turntable 4. The linear guide rail 6 can be fixed to the base plate 1 with bolts. The slider 7 cooperates with the guide rail, and the bottom of the second support frame 5 is rigidly connected to the slider 7. The operator can push the second support frame 5 to drive the slider 7 to translate along the linear guide rail 6, so that the sensor 10 moves towards or away from the turntable 4. Through the mechanical constraint of the guide rail and the slider 7, the second support frame 5 can only move along a single axis, which helps to eliminate yaw error.

[0031] In some embodiments, the second support frame 5 includes a frame body 51, a mounting groove 511, and a fastener 52. The frame body 51 is fixedly connected to the slider 7. The mounting groove 511 is formed on the frame body 51 and is used to place the sensor 10. The fastener 52 passes through the frame body 51 and extends into the mounting groove 511 to abut against the sensor 10. The upper end of the frame body 51 may have a through mounting groove 511, and the side wall of the upper end of the frame body 51 may have a threaded hole. The fastener 52 includes a bolt with a handle, and the fastener 52 passes through the threaded hole and abuts against the housing of the sensor 10. After the sensor 10 is embedded in the mounting groove 511, tightening the bolt will generate a certain clamping force, allowing sensors 10 of different sizes to be replaced in a relatively short time.

[0032] In some embodiments, the sensor switching frequency measuring fixture provided by this utility model further includes a mounting block 8, which matches a mounting groove 511. The mounting block 8 has a limiting groove 81 that matches a sensor 10, which is embedded in the limiting groove 81. When the mounting block 8 is inserted into the mounting groove 511, a fastener 52 penetrates the frame 51 and extends into the mounting groove 511, abutting against the mounting block 8 to press and fix it. The limiting groove 81 is located at the center of the mounting block 8. During installation, the sensor 10 is first inserted into the limiting groove 81 to form an interference fit, and then the entire mounting block 8 is inserted into the mounting groove 511 of the frame 51, with the bolt end directly pressing against the side of the mounting block 8. By absorbing the stress of the bolt tightening, the mounting block 8 can prevent the sensing surface from shifting due to deformation of the sensor 10's housing. In addition, multiple mounting blocks 8 can be pre-set, and the limiting groove 81 of each mounting block 8 matches the corresponding specification of the sensor 10. When it is necessary to measure the sensor 10 of different specifications, only the corresponding mounting block 8 needs to be replaced. This is beneficial to shorten the replacement time and improve the measurement efficiency in the process of measuring a large number of sensors 10 of different specifications.

[0033] In some embodiments, the central axis of the limiting groove 81 is parallel to the central axis of the mounting groove 511, and the central axis of the mounting groove 511 is parallel to the rotating shaft 31. The central axes of the limiting groove 81 and the mounting groove 511 are both parallel to the rotating shaft 31 of the driver 3, so that the sensing surface of the sensor 10 will always be parallel to the movement trajectory of the tooth groove 41.

[0034] In some embodiments, the sensor switching frequency measuring fixture provided by this utility model further includes a controller 9. The controller 9 is mounted on the base plate 1 and is electrically connected to the driver 3 to adjust the rotational speed of the driver 3. Those skilled in the art will understand that the specific structure of the controller 9 in the sensor switching frequency measuring fixture provided by this utility model is not limited; it is only necessary to achieve the adjustment of the rotational speed of the driver 3 through the electrical connection between the controller 9 and the driver 3. For example, the controller 9 may include a PLC controller 9, which slowly increases or decreases the rotational speed by controlling the motor speed.

[0035] In some embodiments, the turntable 4 includes a disc body 42 and a plurality of protruding teeth 43. The disc body 42 is connected to the rotating shaft 31. The plurality of protruding teeth 43 are evenly arranged along the outer periphery of the disc body 42, and a tooth groove 41 is provided between two adjacent protruding teeth 43. The sensing surface of the sensor 10 faces the protruding teeth 43 or the tooth groove 41. For example, the number of protruding teeth 43 can be 16, and the 16 protruding teeth 43 are evenly distributed on the outer periphery of the disc body 42. That is, the plurality of protruding teeth 43 are evenly distributed along the outer periphery of the disc body 42 to form a periodic tooth groove 41 structure, and the sensing surface of the sensor 10 faces the protruding teeth 43 or the tooth groove 41. When the driver 3 drives the turntable 4 to rotate, the tooth groove 41 area and the non-tooth groove 41 area alternately pass over the sensing surface of the sensor 10, so that the sensor 10 outputs a pulse signal. For example, if the driver 3 drives the disc body 42 to rotate through the rotating shaft 31, the protruding teeth 43 and the tooth groove 41 alternately pass over the sensing surface of the sensor 10, so that the sensor 10 generates a periodic pulse signal due to the physical difference between the protruding teeth 43 and the tooth groove 41. The uniform distribution of the protrusions 43 and the grooves 41 ensures consistent pulse intervals. When the sensing surface faces the protrusions 43, the sensor 10 outputs a high level, and when facing the grooves 41, it outputs a low level, thus forming a stable switching state. By changing the rotational speed of the driver 3 and recording the number of pulses per unit time, the switching frequency of the sensor 10 can be calculated.

[0036] In some embodiments, the spacing between two adjacent teeth 43 is 37mm to 39mm, ensuring that the number of pulse signals generated per revolution of the turntable 4 avoids counting errors due to excessive signal density, while also preventing excessive signal sparseness from affecting frequency measurement accuracy. Viewed radially along the disk body 42, the depth of the teeth 43 is 18.5mm to 19.5mm, creating a clear sensing difference between the toothed area 41 and the non-toothed area 41. When the rotational speed of the turntable 4 is slowly adjusted, the spacing between the two teeth 43 and the depth range of the teeth 43, i.e., the sensor 10, can still clearly distinguish adjacent pulses at its maximum rated speed, avoiding signal overlap due to excessively small tooth spacing or reduced sampling efficiency due to excessively large tooth spacing. Simultaneously, the teeth 43 provide sufficient triggering area in the radial direction, reducing the risk of missed detections.

[0037] In some embodiments, when viewed along a radial direction perpendicular to the disk body 42, the width of the protrusion 43 is 18.5 mm to 19.5 mm, providing sufficient sensing area to ensure reliable triggering of the sensor 10 within a certain lateral offset. When viewed along a direction perpendicular to the plane containing the disk body 42, the thickness of the disk body 42 is 2.9 mm to 3.1 mm, which reduces the load and vibration of the driver 3, allowing the turntable 4 to maintain dynamic balance during high-speed rotation, reducing jitter, and suppressing vibration transmission to the base plate 1.

[0038] In some embodiments, the sensor switching frequency measuring fixture provided by this utility model further includes a protective cover, which is configured to surround the driver 3, the turntable 4, the first support frame 2, and the second support frame 5. By enclosing the driver 3, the turntable 4, the first support frame 2, and the second support frame 5 entirely with the protective cover, external airflow and dust are isolated, preventing foreign objects from entering and causing pulse abnormalities. Simultaneously, the protective cover limits the possibility of debris being flung out during the high-speed rotation of the turntable 4, or accidental contact by the operator, thus improving operational safety. Furthermore, the enclosed environment helps reduce the impact of ambient light and electromagnetic interference on the sensor 10 signal, resulting in more stable pulse output.

[0039] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A sensor switch frequency measurement fixture, comprising: The sensor switching frequency measuring fixture includes a base plate, a first support frame mounted on the base plate, a driver mounted on the first support frame, a turntable with toothed grooves, and a second support frame slidably disposed on the base plate. The turntable is connected to the rotating shaft of the driver, and the driver drives the rotating shaft to rotate the turntable. The second support frame is used to detachably mount the sensor, and the second support frame drives the sensor to move in a direction closer to or away from the turntable, with the sensing surface of the sensor facing the turntable.

2. The sensor switch frequency measurement fixture of claim 1, wherein, The sensor switching frequency measuring fixture also includes a linear guide rail fixed to the base plate and a slider slidably connected to the linear guide rail. The slider is fixedly connected to the second support frame, and the slider drives the second support frame to move along the linear guide rail toward or away from the turntable.

3. The sensor switch frequency measurement fixture of claim 2, wherein, The second support frame includes a frame body fixedly connected to the slider, a mounting slot formed in the frame body, and fasteners. The mounting slot is used to place the sensor; the fasteners extend through the frame body into the mounting slot and abut against the sensor.

4. The sensor switch frequency measurement fixture of claim 3, wherein, The sensor switching frequency measuring fixture also includes a mounting block that matches the mounting slot. The mounting block has a limiting slot that matches the sensor. The sensor is embedded in the limiting slot. When the mounting block is inserted into the mounting slot, the fastener extends through the frame into the mounting slot and abuts against the mounting block to press and fix the mounting block.

5. The sensor switch frequency measurement fixture of claim 4, wherein, The central axis of the limiting groove is parallel to the central axis of the mounting groove, and the central axis of the mounting groove is parallel to the rotating shaft.

6. The sensor switch frequency measurement fixture of claim 1, wherein, The sensor switching frequency measuring fixture also includes a controller mounted on the base plate, which is electrically connected to the driver to adjust the rotational speed of the driver.

7. The sensor switch frequency measurement fixture of claim 1, wherein, The turntable includes a disc body connected to the rotating shaft, and a plurality of protruding teeth evenly arranged along the outer periphery of the disc body. A tooth groove is provided between two adjacent protruding teeth, and the sensing surface of the sensor faces the protruding teeth or the tooth groove.

8. The sensor switch frequency measurement fixture of claim 7, wherein, The distance between two adjacent protrusions is 37mm to 39mm; when viewed along the radial direction of the disc, the depth of the protrusion is 18.5mm to 19.5mm.

9. The sensor switch frequency measurement fixture of claim 7, wherein, Viewed in a direction perpendicular to the radial direction of the disk body, the width of the protrusion is 18.5 mm to 19.5 mm; viewed in a direction perpendicular to the plane on which the disk body is located, the thickness of the disk body is 2.9 mm to 3.1 mm.

10. The sensor switch frequency measurement fixture of claim 1, wherein, The sensor switching frequency measuring fixture also includes a protective cover that surrounds the driver, the turntable, the first support frame, and the second support frame.

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