Motor speed measuring device

Abstract

The utility model discloses a motor speed measuring device, which comprises a fixed seat, a friction mechanism and a speed measuring mechanism, the friction mechanism is movably connected to the fixing base and used for abutting against a rotating shaft of a motor. The speed measuring mechanism is installed on the fixing base and used for detecting the rotating speed of the friction mechanism. The motor speed measuring device is simple to operate, can flexibly adapt to different motor rotating shafts, and does not need to adjust and replace parts complexly, thereby remarkably improving the adaptability to various motors. Meanwhile, the speed measurement performance is optimized through the specialized design that the friction mechanism and the speed measurement mechanism are separated, high-precision rotation speed measurement can be achieved, the stability of the motor speed measurement device is guaranteed through the fixing base, external interference is reduced, the measurement precision is further improved, and the high-precision motor speed measurement requirement is met.

Description

Technical Field

[0001] This utility model relates to the field of motor speed measurement technology, and in particular to a motor speed measuring device. Background Technology

[0002] Accurate measurement of motor speed is crucial during the production, debugging, and use of motors. Existing motor speed measurement methods and devices have many shortcomings. For example, some motor speed measurement devices have poor adaptability to different motors; others have low measurement accuracy and cannot meet the requirements for high-precision motor speed measurement. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing motor speed measuring devices, such as poor adaptability and low measurement accuracy, and to provide a motor speed measuring device.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model provides a motor speed measuring device, including: a fixed base, a friction mechanism, and a speed measuring mechanism; the friction mechanism is movably connected to the fixed base and is used to abut against the rotating shaft of the motor; the speed measuring mechanism is installed on the fixed base and is used to detect the rotation speed of the friction mechanism.

[0006] In one embodiment, the friction mechanism includes a friction component, a rotating component, and a bearing; the bearing is connected to the fixed base; one end of the rotating component is connected to the bearing, and the other end is connected to the friction component; the friction component is used to abut against the rotating shaft; and the speed measuring mechanism is used to detect the rotational speed of the rotating component.

[0007] In one embodiment, the rotating assembly includes a rotating shaft, an elastic element, and a movable rod; the rotating shaft is movably connected to the bearing and has a movable groove inside; the elastic element and the movable rod are installed in the movable groove, and both ends of the elastic element are respectively connected to the rotating shaft and the movable rod; one end of the movable rod near the elastic element is also drive-connected to the rotating shaft, and the other end is drive-connected to the friction assembly.

[0008] In one embodiment, the rotating shaft is provided with a guide groove along the axial direction; the movable rod is connected to a guide member; the guide member is slidably connected to the guide groove.

[0009] In one embodiment, a signal trigger is connected to the outer periphery of the rotating shaft; the speed measuring mechanism includes a speed sensor mounted on the fixed base; the speed sensor is oriented toward the rotating shaft and is used to sense the signal trigger.

[0010] In one embodiment, a drive mechanism is connected to the end of the fixed base away from the friction mechanism.

[0011] In one embodiment, the mounting base includes a first mounting plate, a second mounting plate, and a shock absorber; the two ends of the shock absorber are respectively connected to the first mounting plate and the second mounting plate; the bearing is connected to the first mounting plate; and the drive mechanism is connected to the second mounting plate.

[0012] In one embodiment, the speed measuring mechanism further includes a fixing member, one end of which is connected to a second fixing plate, and the other end of which passes through the first fixing plate and is connected to the speed measuring sensor.

[0013] In one embodiment, the driving mechanism includes a movable guide rail and a driving member; the driving member is provided with an output shaft; the output shaft, the movable guide rail and the second fixed plate are sequentially connected in a transmission manner; the driving member is also slidably connected to the movable guide rail.

[0014] In one embodiment, the friction assembly includes an outer friction head and / or an inner friction head; the outer friction head is detachably connected to the movable rod for abutting against the outer side of the rotating shaft; the inner friction head is also detachably connected to the movable rod for abutting against the center hole of the rotating shaft.

[0015] The advantages of this motor speed measuring device compared to existing technologies are as follows: The device has an ingenious structure, integrating a friction mechanism and a speed measuring mechanism into a fixed base. The friction mechanism abuts against the motor's rotating shaft, while the speed measuring mechanism detects the rotational speed of the friction mechanism. This facilitates motor speed measurement and allows for flexible adaptation to different motor rotating shafts without the need for complex adjustments or component replacements, significantly improving adaptability to various types of motors. Furthermore, the specialized design separating the friction mechanism and the speed measuring mechanism optimizes speed measurement performance, enabling high-precision speed measurement. The fixed base ensures the stability of the motor speed measuring device, reduces external interference, further improves measurement accuracy, and meets the requirements for high-precision motor speed measurement.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art 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 A schematic diagram illustrating the application scenario of the motor speed measuring device provided by this utility model;

[0019] Figure 2 A schematic diagram of the motor speed measuring device provided by this utility model;

[0020] Figure 3 An exploded view of the friction mechanism provided by this utility model;

[0021] Figure 4 An exploded view of the fixed base, speed measuring mechanism and drive mechanism provided by this utility model. Attached Figure Description

[0023] 1. Fixed base; 11. First fixed plate; 12. Second fixed plate; 13. Shock absorber; 2. Friction mechanism; 21. Friction assembly; 211. External friction head; 212. Internal friction head; 22. Rotating assembly; 221. Rotating shaft; 2211. Guide groove; 222. Elastic element; 223. Movable rod; 2231. Mounting part; 224. Guide element; 225. Signal trigger element; 23. Bearing; 3. Speed ​​measuring mechanism; 31. Speed ​​sensor; 32. Fixed element; 4. Rotating shaft; 5. Drive mechanism; 51. Movable guide rail; 52. Drive element; 521. Output shaft. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the motor speed measuring device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0031] See Figures 1 to 4 As shown, this utility model provides a specific embodiment of a motor speed measuring device, including: a fixed base 1, a friction mechanism 2, and a speed measuring mechanism 3; the friction mechanism 2 is movably connected to the fixed base 1 and is used to abut against the rotating shaft 4 of the motor; the speed measuring mechanism 3 is installed on the fixed base 1 and is used to detect the rotation speed of the friction mechanism 2.

[0032] Specifically, by integrating the entire motor speed measuring device onto the fixed base 1, the friction mechanism 2 abuts against the motor rotating shaft 4, utilizing friction to make the friction mechanism 2 rotate along with the motor rotating shaft 4. The speed measuring mechanism 3 is mounted on the fixed base 1 and is used to detect the rotational speed of the friction mechanism 2, thereby indirectly obtaining the rotational speed of the motor rotating shaft 4. The fixed base 1 serves to support and fix the friction mechanism 2 and the speed measuring mechanism 3, ensuring the stability of the entire motor speed measuring device. This motor speed measuring device has a simple structure and is easy to implement. It can be easily connected to the motor, and the motor speed is measured by detecting the rotational speed of the friction mechanism 2, making it relatively flexible to adapt to the rotating shaft 4 of different types of motors. When performing motor speed measurement, simply abutting the friction mechanism 2 against the rotating shaft 4 to achieve effective contact between the friction mechanism 2 and the rotating shaft 4 is sufficient to achieve the speed measurement function, without the need for complex adjustments or component replacements for different motors, thus improving adaptability to different motors. Meanwhile, the motor speed measuring device separates the friction mechanism 2 from the speed measuring mechanism 3, with the speed measuring mechanism 3 specifically designed to detect the rotational speed of the friction mechanism 2. This specialized design optimizes the performance of the speed measuring mechanism 3 to a certain extent, enabling higher-precision speed measurement to meet the requirements of high-precision motor speed measurement. Furthermore, the mounting base 1 makes the entire motor speed measuring device more stable during operation, reducing the impact of vibration and other factors on the measurement results, thus further improving measurement accuracy.

[0033] In one specific embodiment, the friction mechanism 2 includes a friction component 21, a rotating component 22, and a bearing 23; the bearing 23 is connected to the fixed base 1; one end of the rotating component 22 is connected to the bearing 23, and the other end is connected to the friction component 21; the friction component 21 is used to abut against the rotating shaft 4; and the speed measuring mechanism 3 is used to detect the rotation speed of the rotating component 22.

[0034] Specifically, bearing 23 is mounted on fixed base 1 to provide support for rotating component 22, enabling it to rotate smoothly. One end of rotating component 22 is connected to fixed base 1 via bearing 23, and the other end is connected to friction component 21. When friction component 21 abuts against motor rotating shaft 4, motor rotating shaft 4 drives friction component 21 to rotate, which in turn drives rotating component 22 to rotate around bearing 23. Speed ​​measuring mechanism 3 obtains motor speed by detecting the rotational speed of rotating component 22. This structure further refines the composition of friction mechanism 2, making its rotation more stable and improving the accuracy of speed measurement. The use of bearing 23 reduces friction during rotation of rotating component 22, improving the mechanical efficiency of motor speed measuring device and extending its service life.

[0035] In one specific embodiment, the rotating assembly 22 includes a rotating shaft 221, an elastic element 222, and a movable rod 223; the rotating shaft 221 is movably connected to the bearing 23 and has an internal movable groove (not shown in the figure); the elastic element 222 and the movable rod 223 are installed in the movable groove, and the two ends of the elastic element 222 are respectively connected to the rotating shaft 221 and the movable rod 223; one end of the movable rod 223 near the elastic element 222 is also drivenly connected to the rotating shaft 221, and the other end is drivenly connected to the friction assembly 21.

[0036] Specifically, one end of the movable rod 223 is connected to the elastic element 222 and is driven by the rotating shaft 221, while the other end is connected to the friction assembly 21. When the motor rotating shaft 4 drives the friction assembly 21 to rotate, the friction assembly 21 drives the rotating shaft 221 to rotate synchronously through the movable rod 223, thereby realizing the power transmission between the friction assembly 21 and the rotating shaft 221, making the power transmission more reliable. The elastic element 222 is set in the movable groove of the rotating shaft 221. Its function is that when the friction assembly 21 abuts against the motor rotating shaft 4, the friction assembly 21 will generate a thrust on the movable rod 223, causing the elastic element 222 to be compressed by the thrust of the movable rod 223 and generate a corresponding reaction force. This reaction force pushes the movable rod 223 and the friction assembly 21 in the opposite direction, so that the friction assembly 21 always stably abuts against the motor rotating shaft 4 during the speed measurement process, thereby ensuring the smoothness of the transmission and the accuracy of the speed measurement. Furthermore, the inclusion of the elastic element 222 improves the adaptability of the motor speed measuring device to changes in motor speed and vibration, reducing the impact of unstable motor operation on the accuracy of speed measurement. The buffering effect of the elastic element 222 protects the internal components of the motor speed measuring device, extending its service life.

[0037] Understandably, the elastic element 222 can be made of different types of elastic components, such as springs or rubber pads. The shape and size of the movable groove can also be adjusted according to actual needs to accommodate the installation requirements of different elastic elements 222 and movable rods 223.

[0038] In one specific embodiment, the rotating shaft 221 is provided with a guide groove 2211 along the axial direction; the movable rod 223 is connected to a guide member 224; the guide member 224 is slidably connected to the guide groove 2211.

[0039] Specifically, when the movable rod 223 is displaced under the action of the friction assembly 21 and the elastic element 222, the guide element 224 slides within the guide groove 2211, thereby restricting the direction of movement of the movable rod 223. This ensures that the movable rod 223 can only move axially relative to the rotating shaft 221, while maintaining synchronous movement between the movable rod 223 and the rotating shaft 221 in the circumferential direction, thus guaranteeing the transmission stability between the movable rod 223 and the rotating shaft 221. The design of the guide groove 2211 and the guide element 224 further improves the accuracy and stability of the movement of the movable rod 223 and ensures the synchronicity of the circumferential movement of the movable rod 223 and the rotating shaft 221, thereby improving the speed measurement accuracy of the entire motor speed measuring device. Furthermore, this structure is simple and easy to manufacture and install.

[0040] In one specific embodiment, a signal trigger 225 is connected to the outer periphery of the rotating shaft 221; the speed measuring mechanism 3 includes a speed sensor 31 mounted on the fixed base 1; the speed sensor 31 is arranged facing the rotating shaft 221 and is used to sense the signal trigger 225.

[0041] Specifically, the signal trigger 225 is connected to the outer circumference of the rotating shaft 221 and rotates together with the rotating shaft 221. The speed sensor 31 is mounted on the fixed base 1 and faces the rotating shaft 221. When the signal trigger 225 rotates with the rotating shaft 221 and passes the speed sensor 31, the speed sensor 31 can sense the change in the signal trigger 225 and calculate the rotational speed of the rotating shaft 221 by detecting the frequency of the change in the signal trigger 225, thereby obtaining the motor speed. This speed measurement method has high accuracy and can accurately measure the motor speed. The combined use of the signal trigger 225 and the speed sensor 31 makes the speed measurement process more stable and reliable, and less susceptible to external interference. At the same time, the speed sensor 31 is mounted on the fixed base 1, which facilitates installation and maintenance.

[0042] It is understandable that the signal trigger 225 can take different forms, such as magnetic materials or reflective materials. The speed sensor 31 can also be selected according to the type of the signal trigger 225. For example, when the signal trigger 225 is made of magnetic material, a Hall sensor can be used; when the signal trigger 225 is made of reflective material, a photoelectric sensor can be used. Furthermore, sensors based on other speed measurement principles, such as encoders, can also be used, as long as they can detect the rotational speed of the rotating shaft 221.

[0043] In one specific embodiment, the end of the fixed base 1 away from the friction mechanism 2 is connected to the drive mechanism 5.

[0044] Specifically, the drive mechanism 5 is connected to the end of the fixed base 1 away from the friction mechanism 2, and its function is to provide power for moving or adjusting the position of the entire motor speed measuring device. When it is necessary to install the motor speed measuring device onto the motor, the drive mechanism 5 can drive the fixed base 1 to move, so that the friction mechanism 2 can be accurately and stably connected to the motor rotating shaft 4. The setting of the drive mechanism 5 increases the flexibility of the motor speed measuring device and facilitates its use in different working scenarios. The position of the motor speed measuring device can be quickly and accurately adjusted through the drive mechanism 5, improving work efficiency.

[0045] In one specific embodiment, the fixed base 1 includes a first fixed plate 11, a second fixed plate 12, and a shock absorber 13; the two ends of the shock absorber 13 are respectively connected to the first fixed plate 11 and the second fixed plate 12; the bearing 23 is connected to the first fixed plate 11; and the drive mechanism 5 is connected to the second fixed plate 12.

[0046] Specifically, the mounting base 1 consists of a first mounting plate 11, a second mounting plate 12, and a shock absorber 13. The shock absorber 13 connects between the first mounting plate 11 and the second mounting plate 12, serving as a buffer and damping element. When the motor vibrates during operation, the shock absorber 13 absorbs and reduces the vibration transmitted to the mounting base 1, thereby reducing the impact on the speed measuring mechanism 3, the friction mechanism 2, and the drive mechanism 5. The bearing 23 is mounted on the first mounting plate 11 to support the rotating assembly 22; the drive mechanism 5 is connected to the second mounting plate 12 to provide power to the entire motor speed measuring device. The installation of the shock absorber 13 improves the vibration resistance of the motor speed measuring device and ensures the accuracy of speed measurement. During motor operation, even if significant vibrations occur, the shock absorber 13 effectively reduces the damage to the internal components of the motor speed measuring device, extending its service life. Furthermore, the mounting base 1 has a reasonable structure, facilitating the installation and maintenance of all components.

[0047] It is understandable that the shock absorber 13 can be made of different types of shock absorber materials or shock absorbers, such as rubber shock absorber pads, spring shock absorbers, air shock absorbers, etc.

[0048] In one specific embodiment, the speed measuring mechanism 3 further includes a fixing member 32, one end of which is connected to the second fixing plate 12, and the other end passes through the first fixing plate 11 and is connected to the speed measuring sensor 31.

[0049] Specifically, one end of the fixing member 32 is connected to the second fixing plate 12, and the other end extends to the end of the first fixing plate 11 away from the shock absorber 13 and connects to the speed sensor 31. Its function is to stably fix the speed sensor 31 to the fixing base 1, ensuring the positional accuracy of the speed sensor 31 during operation. Simultaneously, by connecting the speed sensor 31 to the second fixing plate 12 through the fixing member 32, the stability of the second fixing plate 12 is utilized to improve the vibration resistance of the speed sensor 31. The fixing member 32 makes the installation of the speed sensor 31 more secure, reducing positional displacement of the speed sensor 31 caused by vibration or other factors, thereby improving the accuracy of speed measurement. The connection method of the fixing member 32 ensures a reliable connection between the speed sensor 31 and the fixing base 1, facilitating the installation and disassembly of the speed sensor 31 for maintenance and replacement.

[0050] In one specific embodiment, the drive mechanism 5 includes a movable guide rail 51 and a drive member 52; the drive member 52 is provided with an output shaft 521; the output shaft 521, the movable guide rail 51 and the second fixed plate 12 are sequentially connected in a transmission manner; the drive member 52 is also slidably connected to the movable guide rail 51.

[0051] Specifically, when the drive unit 52 operates, the output shaft 521 extends and retracts, driving the movable guide rail 51 to move along its preset guide direction. One end of the movable guide rail 51 is connected to the output shaft 521, receiving the driving force from the output shaft 521, and the other end is connected to the second fixed plate 12, transmitting the driving force to the second fixed plate 12. In this process, the extension and retraction of the output shaft 521 is converted into the linear movement of the movable guide rail 51. The movement of the movable guide rail 51 drives the connected second fixed plate 12 to move synchronously. Since the fixed seat 1 is composed of the first fixed plate 11, the second fixed plate 12, and the shock absorber 13, the movement of the second fixed plate 12 causes the entire fixed seat 1 to shift. Through this structure, the extension and retraction power of the output shaft 521 of the drive unit 52 can be accurately transmitted to the fixed seat 1, realizing the adjustment of the position of the motor speed measuring device. With the drive unit 52 fixed, and the movable guide rail 51 being moved only by the extension and retraction of the output shaft 521, this design enables precise control of the position of the fixed seat 1. Compared to the self-movement of the drive component 52, this method reduces positional deviations caused by factors such as changes in the center of gravity of the drive component 52. When precisely positioning the motor speed measuring device, it allows for more accurate alignment of the friction mechanism 2 with the motor's rotating shaft 4, improving the installation accuracy of the motor speed measuring device and thus enhancing speed measurement precision. Simultaneously, the stable movement of the movable guide rail 51 in the guiding direction, combined with the fixed state of the drive component 52, forms a relatively stable power transmission system. Even in complex working environments, such as when the motor generates significant vibrations, it ensures smooth power transmission to the fixed base 1, reducing displacement or swaying of the motor speed measuring device due to vibration and improving the operational stability of the motor speed measuring device.

[0052] Understandably, the drive unit 52 can be selected from different types of power equipment, such as motors and cylinders, according to actual needs.

[0053] In one specific embodiment, the friction assembly 21 includes an outer friction head 211 and / or an inner friction head 212; the outer friction head 211 is detachably connected to the movable rod 223 and is used to abut against the outside of the rotating shaft 4; the inner friction head 212 is also detachably connected to the movable rod 223 and is used to abut against the center hole of the rotating shaft 4.

[0054] Specifically, when it is necessary to measure the rotational speed of the motor shaft 4 but the motor shaft 4 does not have a central hole, the outer friction head 211 is mounted on the movable rod 223 and abuts against the outer side of the motor shaft 4. Friction forces drive the outer friction head 211 and the movable rod 223 to rotate synchronously, thereby driving the rotating shaft 221 and its peripheral signal trigger 225 to rotate synchronously. This allows the speed sensor 31 to measure speed by sensing the trigger signal of the signal trigger 225. When the motor shaft 4 has a central hole, the inner friction head 212 can be mounted on the movable rod 223 and inserted into the central hole of the rotating shaft 4. Friction forces drive the inner friction head 212 and the movable rod 223 to rotate. Alternatively, both the inner friction head 212 and the outer friction head 211 can abut against the rotating shaft 4; that is, the inner friction head 212 abuts against the central hole of the rotating shaft 4, providing internal support and friction, while the outer friction head 211 abuts against the outer side of the rotating shaft 4, applying external pressure. This internal and external synergy constrains the rotating shaft 4 in multiple directions, significantly enhancing the stability of the connection with the rotating shaft 4 compared to using the internal friction head 212 or external friction head 211 alone. Even when the motor is rotating at high speed or experiencing significant vibration, it effectively prevents relative displacement, loosening, or even detachment between the friction assembly 21 and the rotating shaft 4, ensuring stable operation of the entire motor speed measuring device. This reduces speed measurement errors caused by unstable connections, improves speed measurement accuracy, and meets the requirements for high-precision motor speed measurement. The design of the external friction head 211 and internal friction head 212 increases the adaptability of the motor speed measuring device to different types of motor rotating shafts 4, improving its versatility. The detachable connection facilitates the replacement of friction heads of different specifications to meet the speed measurement needs of motor rotating shafts 4 of different sizes and structures. Furthermore, selecting the appropriate friction head for speed measurement based on the actual conditions of the motor rotating shaft 4 improves the accuracy and reliability of the speed measurement.

[0055] More specifically, the movable rod 223 has a mounting portion 2231 at one end near the friction assembly 21. The mounting portion 2231 is arranged in a ring shape, and the outer friction head 211 or the inner friction head 212 abuts against the inner or outer side of the mounting portion 2231. The mounting portion 2231 has at least one first fixing hole (not shown in the figure) in the radial direction, preferably two to six. The outer friction head 211 and the inner friction head 212 have second fixing holes (not shown in the figure) corresponding to the first fixing holes. The connecting piece (not shown in the figure) is detachably connected to the first fixing hole and the second fixing hole.

[0056] Specifically, an annular mounting portion 2231 is provided at the end of the movable rod 223 near the friction assembly 21, providing a mounting base for the outer friction head 211 and the inner friction head 212. The annular structure can evenly distribute the force, ensuring that the friction assembly 21 is stably connected to the mounting portion 2231 during operation, avoiding loosening or damage caused by uneven local force. Furthermore, the annular mounting portion 2231 provides clear positioning for the installation of the friction heads, reducing installation difficulty and improving assembly efficiency. Operators can quickly and accurately install the friction heads onto the movable rod 223, reducing installation time and labor costs. The mounting portion 2231 has multiple first fixing holes radially arranged, and the outer friction head 211 and inner friction head 212 have corresponding second fixing holes. Detachable connections are achieved by connecting parts (such as bolts, pins, etc.) passing through these fixing holes. This design allows the friction heads to be flexibly replaced according to the actual situation of the motor rotating shaft 4, and the connection is firm and reliable. Moreover, the multiple fixing holes are evenly distributed in the mounting portion 2231, and after being fixed by connecting parts, they can effectively prevent the friction heads from shifting, rotating, or falling off during operation. Especially when the motor is rotating at high speed or there is vibration, a stable connection can ensure the normal operation of the motor speed measuring device and improve the accuracy of speed measurement.

[0057] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A motor speed measuring device, characterized in that, include: A fixed base, a friction mechanism, and a speed measuring mechanism; the friction mechanism is movably connected to the fixed base and is used to abut against the rotating shaft of the motor; The speed measuring mechanism is mounted on the fixed base and is used to detect the rotational speed of the friction mechanism.

2. The motor speed measuring device according to claim 1, characterized in that, The friction mechanism includes a friction component, a rotating component, and a bearing; the bearing is connected to the fixed base; one end of the rotating component is connected to the bearing, and the other end is connected to the friction component; the friction component is used to abut against the rotating shaft; the speed measuring mechanism is used to detect the rotation speed of the rotating component.

3. The motor speed measuring device according to claim 2, characterized in that, The rotating assembly includes a rotating shaft, an elastic element, and a movable rod; the rotating shaft is movably connected to the bearing and has a movable groove inside; the elastic element and the movable rod are installed in the movable groove, and the two ends of the elastic element are respectively connected to the rotating shaft and the movable rod; one end of the movable rod near the elastic element is also drivenly connected to the rotating shaft, and the other end is drivenly connected to the friction assembly.

4. The motor speed measuring device according to claim 3, characterized in that, The rotating shaft is provided with a guide groove along the axial direction; the movable rod is connected to a guide member; the guide member is slidably connected to the guide groove.

5. The motor speed measuring device according to claim 3, characterized in that, A signal trigger is connected to the outer periphery of the rotating shaft; the speed measuring mechanism includes a speed sensor mounted on the fixed base; the speed sensor is oriented toward the rotating shaft and is used to sense the signal trigger.

6. The motor speed measuring device according to claim 5, characterized in that, The end of the fixed base away from the friction mechanism is connected to a driving mechanism.

7. The motor speed measuring device according to claim 6, characterized in that, The mounting base includes a first mounting plate, a second mounting plate, and a shock absorber; the two ends of the shock absorber are respectively connected to the first mounting plate and the second mounting plate; the bearing is connected to the first mounting plate; and the drive mechanism is connected to the second mounting plate.

8. The motor speed measuring device according to claim 7, characterized in that, The speed measuring mechanism also includes a fixing component, one end of which is connected to the second fixing plate, and the other end passes through the first fixing plate and is connected to the speed sensor.

9. The motor speed measuring device according to claim 7, characterized in that, The driving mechanism includes a movable guide rail and a driving component; the driving component is provided with an output shaft; the output shaft, the movable guide rail and the second fixed plate are sequentially connected in a transmission manner; the driving component is also slidably connected to the movable guide rail.

10. The motor speed measuring device according to claim 3, characterized in that, The friction assembly includes an outer friction head and / or an inner friction head; the outer friction head is detachably connected to the movable rod and is used to abut against the outside of the rotating shaft; the inner friction head is also detachably connected to the movable rod and is used to abut against the center hole of the rotating shaft.

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