A detection device for stepping motor resonance

Abstract

The present invention is applicable to the field of stepper motor detection technology, and provides a detection device for stepper motor resonance, including a limit assembly and a connecting assembly; the limit assembly includes an adjusting part, a shock-absorbing spring, a hole detection sensor, a fixing plate, and a limit assembly; the connecting assembly includes a driving cylinder, a driving rod, a bearing, a sleeve, a first connecting plate, a sleeve plate, and a connecting shaft; through the design of the limit assembly, the shaking range of the stepper motor when resonance occurs is continuously limited, reducing the problem that the natural frequency and driving frequency of the stepper motor will still be close to or equal to the resonance parameter due to various factors (such as signal frequency drift, signal interference, etc.), thereby reducing the influence of the aggravated resonance on the stepper motor and improving the service life and stability of the stepper motor.

Description

Technical Field

[0001] The present invention relates to the technical field of stepper motor detection, and more particularly to a detection device for stepper motor resonance. Background Art

[0002] A stepper motor is an electric motor that converts electrical pulse signals into corresponding angular or linear displacements. It achieves precise control of position and speed through precise step angle control. Specifically, for each input pulse signal, the rotor rotates one angle or advances one step. The output angular or linear displacement is proportional to the number of input pulses, and the speed is proportional to the pulse frequency. Therefore, stepper motors are also called pulse motors. They are widely used in situations requiring high-precision positioning and control, such as CNC machine tools, 3D printers, robots, and automation equipment.

[0003] In the existing technology, stepper motors usually undergo a series of complex and rigorous inspection processes and multiple performance tests before they are officially shipped. These inspections and tests are designed to comprehensively evaluate the various parameters and operating performance of the motors to ensure that their quality meets the standards and can work stably and reliably in actual applications.

[0004] Among them, resonance detection is one of the tests that must be done before stepper motors leave the factory, because resonance is one of the most common problems of stepper motors. Usually, methods such as changing the drive frequency, increasing damping, optimizing the mechanical structure, using micro-stepping drive, increasing the load and improving the installation method can be used to effectively reduce or avoid resonance and ensure the normal operation and long-term stability of the motor.

[0005] However, the existing stepper motor detection methods are still relatively complicated, and they all require manual adjustment of the stepper motor through various methods. Real-time detection and debugging are impossible, which may cause the stepper motor to be damaged due to resonance; after manual debugging once, the stepper motor continues to rotate. Since the stepper motor undergoes a long period of detection after debugging, the stepper motor is affected by various factors (such as signal frequency drift, signal interference, etc.), resulting in the natural frequency and drive frequency of the stepper motor being close to or equal to the resonance parameter, thereby aggravating the resonance of the stepper motor and affecting the service life and stability of the stepper motor.

[0006] Moreover, when the driving load inertia of the stepper motor is large, the stepper motor is prone to generate large vibrations during the stopping process after the detection is completed, increasing the risk of resonance. As mentioned above, the resonance of the stepper motor in the initial detection, or the resonance that occurs again after debugging, will also affect the stability and safety of the detection equipment. For this reason, a detection device for stepper motor resonance is proposed to improve the existing problems. Summary of the Invention

[0007] In view of the deficiencies in the prior art, an object of the present invention is to provide a detection device for stepping motor resonance.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a detection device for resonance of a stepping motor, comprising a limit assembly and a connecting assembly; wherein the limit assembly comprises a base frame, a base plate arranged on the top of the base frame, a support plate arranged in the base plate, support frames symmetrically arranged on both sides of the support plate in the radial direction, a bearing plate arranged between the support frames, an adjustment member symmetrically arranged on one side of the support plate in the axial direction, a shock-absorbing spring arranged at the end of the adjustment member away from the support plate, a hole detection sensor arranged at the side of the adjustment member away from the support plate, a fixing plate arranged in the base plate, and a limit assembly arranged on the side wall of the fixing plate; the connecting assembly is arranged in the base plate, and comprises a driving cylinder, a driving rod arranged at the telescopic end of the driving cylinder, a bearing rotatably connected to the end of the driving rod away from the driving cylinder, a sleeve arranged in the bearing, a first connecting disk arranged at one end of the sleeve, a sleeve plate arranged at the end of the sleeve away from the first connecting disk, and a connecting shaft arranged in the sleeve.

[0009] The present invention is further configured as follows: a placement groove is opened on the top of the base plate, the support plate is located in the placement groove, the support plate is arc-shaped, the end of the support frame away from the support plate can be connected to the inner wall of the placement groove, and the end of the support frame away from the placement groove can be connected to the bottom of the supporting plate.

[0010] The present invention is further configured as follows: the adjusting member includes an adjusting cylinder, an adjusting strip arranged at one end of the adjusting cylinder, an adjusting frame arranged at the end of the adjusting strip away from the adjusting cylinder, and an adjusting roller rotatably connected to the adjusting frame; both ends of the adjusting cylinder are open, the outer wall of the adjusting cylinder can be connected to one side of the support plate, a detection hole is provided on the side of the adjusting cylinder away from the support plate, the end of the adjusting strip away from the adjusting frame can be fitted and plugged into the adjusting cylinder, adjustment holes are evenly provided on the side walls of the adjusting strip, the detection holes can be aligned with the adjustment holes, the adjusting frame is U-shaped, and both ends of the adjusting roller can be rotatably connected to the U-shaped inner wall of the adjusting frame.

[0011] The present invention is further configured as follows: one end of the adjustment bar away from the adjustment frame can be connected to the shock-absorbing spring, one end of the shock-absorbing spring away from the adjustment bar can be connected to the inner wall of the placement groove, the hole detection sensor is located on the side wall of the adjustment cylinder, and the hole detection sensor can be aligned with the detection hole.

[0012] The present invention is further configured as follows: the fixed plate is located in the placement groove, and the limiting member includes a rotating plate symmetrically arranged on one side of the fixed plate in the radial direction, movable bars rotatably connected to both ends of the rotating plate, a first limiting plate arranged between two of the movable bars, a second limiting plate arranged between the other two movable bars, a first roller rotatably connected to the side wall of the first limiting plate, a second roller rotatably connected to the side wall of the second limiting plate, and a rotating motor arranged in the middle of the side wall of one of the rotating plates; the output end of the rotating motor can pass through the side wall of the fixed plate and be connected to one of the rotating plates, a through groove is opened in the middle of the side wall of the fixed plate, the two ends of the first limiting plate can be rotatably connected to one end of two of the movable bars away from the rotating plate, and the two ends of the second limiting plate can be rotatably connected to one end of the other two movable bars away from the rotating plate.

[0013] The present invention is further configured as follows: a first slider is symmetrically provided on the side wall of the first limiting plate away from the first roller, a first slide rail is provided on the side of the first slider away from the first limiting plate, the first slider can slide on the corresponding first slide rail, and the side of the first slide rail away from the first slider can be connected to the fixed plate; a second slider is symmetrically provided on the side wall of the second limiting plate away from the second roller, a second slide rail is provided on the side of the second slider away from the second limiting plate, the second slider can slide on the corresponding second slide rail, and the side of the second slide rail away from the second slider can be connected to the fixed plate.

[0014] The present invention is further configured as follows: the end of the driving cylinder away from the driving rod can be rotatably connected to the inner wall of the placement groove, and a first column is also provided in the placement groove, and the middle part of the side wall of the driving rod can be rotatably connected to the top of the first column, the first connecting plate is located at one end of the bearing, and the sleeve is located at the other end of the bearing; a second column is provided in the placement groove, and the end of the connecting shaft away from the sleeve can be rotatably connected to the side wall of the second column, and a connecting spring is also provided on the connecting shaft, one end of the connecting spring can be connected to the sleeve, and the other end can be connected to the side wall of the second column; sliding bars are symmetrically provided on the inner wall of the sleeve, and long grooves are symmetrically opened on the outer wall of the connecting shaft, and the sliding bars can slide in the long grooves.

[0015] The present invention is further configured as follows: a clamping groove is provided on the side wall of the first connecting disk away from the sleeve, and a second connecting disk is also provided on the side of the first connecting disk away from the sleeve. The structural sizes of the first connecting disk and the second connecting disk are equal, the first connecting disk and the second connecting disk are relatively distributed, and the side of the second connecting disk away from the first connecting disk can be connected to the output shaft of the stepper motor.

[0016] The present invention is further configured such that: the limit assembly and the connection assembly are electrically connected to a monitoring control unit, and the monitoring control unit includes:

[0017] A signal receiving module, the signal receiving module monitoring the noise and speed of the stepper motor and calculating a normal frequency range based on the speed, the signal receiving module including a noise monitoring module mounted on one side of the stepper motor, the signal receiving module monitoring the noise frequency at the stepper motor through the noise monitoring module, generating and transmitting spectrum data;

[0018] a signal analysis module, the signal analysis module receiving the spectrum data transmitted by the signal receiving module, analyzing the data in the spectrum data, generating and transmitting a noise analysis data group;

[0019] a signal processing module, the signal processing module receiving the noise analysis data group transmitted by the signal analysis module, and the signal processing module controlling the limit component and the connection component to limit and separate the stepping motor from the load according to the noise analysis data group;

[0020] The noise analysis group data includes a frequency amplitude f and a frequency amplitude 2f;

[0021] The normal frequency calculation formula is:

[0022]

[0023] in, Indicates the normal frequency, n indicates the motor speed, p is the number of pulses corresponding to the motor step angle, and k is the normal coefficient. The value of k is between 58 and 62.

[0024] The present invention is further configured as follows: the signal processing module controls the limit component and the connection component to limit and separate the stepping motor from the load according to the noise analysis data group, and the specific method is as follows:

[0025] If the noise analysis group data shows that the single frequency amplitude f is within the normal frequency range of the stepper motor speed and the double frequency amplitude 2f does not exceed 10% to 20% of the single frequency amplitude f, it means that the stepper motor is operating normally at this time, and the signal processing module does not send any instructions to the limit component and the connection component;

[0026] If the noise analysis group data shows that the single-frequency amplitude f exceeds the normal frequency range of the stepper motor speed and the double-frequency amplitude 2f does not exceed 10% to 20% of the single-frequency amplitude f, it indicates that the stepper motor has abnormal vibration. The vibration does not affect the connection between the output shaft of the stepper motor and the load. The signal processing module only sends an instruction to the limit component to limit the vibration of the stepper motor.

[0027] If the noise analysis group data shows that the single-fold frequency amplitude f exceeds the normal frequency range of the stepper motor speed and the double-fold frequency amplitude 2f exceeds 10% to 20% of the single-fold frequency amplitude f, it indicates that the stepper motor is vibrating abnormally, and the vibration also affects the connection between the output shaft of the stepper motor and the load. The signal processing module sends an instruction to the limit component to limit the vibration of the stepper motor. At the same time, the signal processing module sends an instruction to the connection component to separate the stepper motor from the load.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] (1) The stepper motor will shake as a whole, and by impacting the adjustment roller and the adjustment frame, it will squeeze the corresponding adjustment bar, causing the adjustment bar to slide in the corresponding adjustment tube; in this process, the corresponding shock-absorbing spring will deform from a free state to a compressed state, and the detection hole will also be aligned with the corresponding adjustment hole due to the sliding of the adjustment bar. At this time, the hole detection sensor is started and the number of adjustment holes passing through the detection hole is scanned. By analyzing the number of adjustment holes passed, the range of stepper motor vibration can be determined, thereby achieving the purpose of real-time detection of resonance intensity.

[0030] (2) Through the design of the limiter, the shaking range of the stepper motor when it resonates is continuously limited, reducing the problem of the stepper motor's natural frequency and driving frequency being close to or equal to the resonance parameters due to various factors (such as signal frequency drift, signal interference, etc.), thereby reducing the impact of the intensified resonance on the stepper motor and improving the service life and stability of the stepper motor.

[0031] (3) The driving cylinder is driven to pull the driving rod, causing the driving rod to deviate, driving the bearing to approach the output shaft of the stepper motor, so that the sleeve, the first connecting disk and the sleeve plate slide synchronously on the connecting shaft, thereby making the first connecting disk approach the second connecting disk. When the clamping groove on the first connecting disk is engaged with the clamping groove on the second connecting disk, the output shaft of the stepper motor can drive the load to rotate through the first connecting disk and the second connecting disk; otherwise, the stepper motor and the load can be separated, thereby achieving the purpose of combining or separating the connection between the output shaft of the stepper motor and the load, avoiding the problem that when the driving load inertia of the stepper motor is large, the stepper motor is prone to generate large vibration during the stop process, increasing the risk of resonance, thereby reducing the resonant frequency of the stepper motor and ensuring the stability of the stepper motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The figure is a schematic diagram of the overall structure of the detection device for stepping motor resonance of the present invention.

[0033] Figure 2 It is a partial structural diagram of the limiting component in the present invention.

[0034] Figure 3 Schematic diagram of the overall structure of the adjusting member in the present invention.

[0035] Figure 4 Schematic diagram of the overall structure of the limiting member in the present invention.

[0036] Figure 5 Schematic diagram of the overall structure of the rotating motor in the present invention.

[0037] Figure 6 Schematic diagram of the overall structure of the connection assembly in the present invention.

[0038] Figure 7 Exploded view of the connection assembly in the present invention.

[0039] Explanation of reference numerals: 1. limit assembly; 11. base frame; 12. base plate; 121. placement groove; 122. first column; 123. second column; 13. support plate; 14. support frame; 141. carrying plate; 15. adjusting member; 151. adjusting cylinder; 152. adjusting bar; 153. adjusting frame; 154. adjusting roller; 155. detection hole; 156. adjustment hole; 16. shock-absorbing spring; 17. hole detection sensor; 18. fixing plate; 181. through groove; 19. limit member; 191. rotating plate; 192. movable bar; 193. first limit plate; 194. second limit plate; 195. first roller; 196. second roller; 197. rotating motor; 198. first slider; 1981. first slide rail; 199. second slider; 1991. second slide rail;

[0040] 2. Connecting assembly; 21. Driving cylinder; 22. Driving rod; 23. Bearing; 24. Sleeve; 241. Sliding bar; 25. First connecting plate; 251. Snap-fit ​​groove; 26. Sleeve plate; 27. Connecting shaft; 271. Connecting spring; 272. Long groove; 28. Second connecting plate;

[0041] 3. Stepper motor. DETAILED DESCRIPTION

[0042] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0043] See also Figure 1-Figure 7 , the present invention provides the following technical solutions:

[0044] Example 1, see Figure 1-Figure 7A detection device for stepper motor resonance includes a limit component 1 and a connection component 2; wherein the limit component 1 is used to detect the stepper motor 3 in real time according to the vibration amplitude generated when the stepper motor 3 resonates, and at the same time limit the vibration range of the stepper motor 3, thereby avoiding the problem that the natural frequency and drive frequency of the stepper motor are still close to or equal to the resonance parameter due to various factors (such as signal frequency drift, signal interference, etc.), thereby aggravating the resonance of the stepper motor 3, thereby reducing the resonance of the stepper motor 3 and the detection device, and improving the stability of the stepper motor 3 and the detection device.

[0045] The function of the connecting component 2 is to combine and splice the output shaft of the stepper motor 3 and the connection of the detection load, avoiding the problem that when the inertia of the driving load of the stepper motor is large, the stepper motor is prone to generate large vibrations during the stopping process after the detection is completed, increasing the risk of resonance with the detection device, thereby reducing the resonance frequency of the stepper motor 3 and ensuring the stability of the stepper motor 3 and the detection device.

[0046] See Figure 1-Figure 5 Specifically, the limit assembly 1 includes a base frame 11, a bottom plate 12 arranged on the top of the base frame 11, a support plate 13 arranged in the bottom plate 12, support frames 14 symmetrically arranged on both sides of the support plate 13 in the radial direction N, a bearing plate 141 arranged between the support frames 14, an adjustment member 15 symmetrically arranged on one side of the support plate 13 in the axial direction M, a shock-absorbing spring 16 arranged at the end of the adjustment member 15 away from the support plate 13, a hole detection sensor 17 arranged at the side of the adjustment member 15 away from the support plate 13, a fixing plate 18 arranged in the bottom plate 12, and a limit member 19 arranged on the side wall of the fixing plate 18.

[0047] Among them, after the stepper motor 3 is installed on the supporting plate 141, the stepper motor 3 can be started so that the output shaft of the stepper motor 3 drives the detection load to rotate. At this time, the shock-absorbing spring 16 is in a free state, so that the adjustment member 15 contacts the outer wall of the stepper motor 3, but does not squeeze each other.

[0048] When the stepper motor 3 resonates, the stepper motor 3 as a whole will shake and squeeze the adjusting parts 15 on both sides, so that the corresponding shock-absorbing springs 16 buffer the shaking and squeezing force, thereby achieving the purpose of shock absorption; in this process, the hole detection sensor 17 will start to detect the position of the corresponding adjusting part 15 after adjustment, thereby achieving the purpose of real-time detection of the resonance intensity.

[0049] It should be noted that the hole detection sensor 17 detects changes in light transmittance or reflection of the hole by emitting infrared or visible light.

[0050] The function of the limiter 19 is to continuously limit the shaking range of the stepper motor 3 when resonance occurs, reducing the problem that the natural frequency and driving frequency of the stepper motor are still close to or equal to the resonance parameters due to various factors of the stepper motor (such as signal frequency drift, signal interference, etc.), thereby leading to the aggravation of the resonance of the stepper motor. This reduces the impact of the aggravated resonance on the stepper motor 3 and the detection device, and improves the stability of the stepper motor 3 and the detection device.

[0051] See Figure 6-Figure 7 Specifically, the connecting assembly 2 is arranged in the base plate 12, and includes a driving cylinder 21, a driving rod 22 arranged at the telescopic end of the driving cylinder 21, a bearing 23 rotatably connected to the end of the driving rod 22 away from the driving cylinder 21, a sleeve 24 arranged in the bearing 23, a first connecting plate 25 arranged at one end of the sleeve 24, a sleeve plate 26 arranged at the end of the sleeve 24 away from the first connecting plate 25, and a connecting shaft 27 arranged in the sleeve 24.

[0052] A snap-in groove 251 is provided on the side wall of the first connecting disk 25 away from the sleeve 24, and a second connecting disk 28 is also provided on the side of the first connecting disk 25 away from the sleeve 24. The structures and sizes of the first connecting disk 25 and the second connecting disk 28 are equal, and the first connecting disk 25 and the second connecting disk 28 are relatively distributed. The side of the second connecting disk 28 away from the first connecting disk 25 can be connected to the output shaft of the stepper motor 3.

[0053] Among them, the driving cylinder 21 is started, pulling the driving rod 22, causing the driving rod 22 to deviate, driving the bearing 23 to approach the output shaft of the stepper motor 3, so that the sleeve 24, the first connecting disk 25 and the sleeve plate 26 slide synchronously on the connecting shaft 27, so that the first connecting disk 25 can be close to the second connecting disk 28. When the snap-in groove 251 on the first connecting disk 25 is engaged with the snap-in groove 251 on the second connecting disk 28, the output shaft of the stepper motor 3 can drive the load to rotate through the first connecting disk 25 and the second connecting disk 28; otherwise, the stepper motor 3 and the load can be separated, thereby achieving the purpose of combining or separating the connection between the output shaft of the stepper motor 3 and the detection load.

[0054] See Figure 1-Figure 3 Furthermore, a placement groove 121 is opened on the top of the base plate 12, and the support plate 13 is located in the placement groove 121. The support plate 13 is arc-shaped, and the end of the support frame 14 away from the support plate 13 can be connected to the inner wall of the placement groove 121. The end of the support frame 14 away from the placement groove 121 can be connected to the bottom of the supporting plate 141.

[0055] See Figure 1-Figure 3Furthermore, the adjusting member 15 includes an adjusting cylinder 151, an adjusting bar 152 provided at one end of the adjusting cylinder 151, an adjusting frame 153 provided at the end of the adjusting bar 152 away from the adjusting cylinder 151, and an adjusting roller 154 rotatably connected to the adjusting frame 153; both ends of the adjusting cylinder 151 are open, the outer wall of the adjusting cylinder 151 can be connected to one side of the support plate 13, a detection hole 155 is provided on the side of the adjusting cylinder 151 away from the support plate 13, the end of the adjusting bar 152 away from the adjusting frame 153 can be fitted and plugged into the adjusting cylinder 151, and adjustment holes 156 are evenly provided on the side wall of the adjusting bar 152. The detection holes 155 can be aligned with the adjustment holes 156. The adjusting frame 153 is U-shaped, and both ends of the adjusting roller 154 can be rotatably connected to the U-shaped inner wall of the adjusting frame 153.

[0056] See Figure 1-Figure 3 Furthermore, one end of the adjustment bar 152 away from the adjustment frame 153 can be connected to the shock-absorbing spring 16, and one end of the shock-absorbing spring 16 away from the adjustment bar 152 can be connected to the inner wall of the placement groove 121. The hole detection sensor 17 is located on the side wall of the adjustment cylinder 151, and the hole detection sensor 17 can be aligned with the detection hole 155.

[0057] Among them, when the stepper motor 3 resonates, the stepper motor 3 as a whole will shake, and by impacting the adjustment roller 154 and the adjustment frame 153, the corresponding adjustment bar 152 will be squeezed, so that the adjustment bar 152 slides in the corresponding adjustment cylinder 151; in this process, the corresponding shock-absorbing spring 16 will be deformed from a free state to a compressed state, and the detection hole 155 will also be aligned with the corresponding adjustment hole 156 due to the sliding of the adjustment bar 152. At this time, the hole detection sensor 17 is started and the number of adjustment holes 155 and 156 passing through the detection hole 155 is scanned. By analyzing the number of adjustment holes 156 passed, the vibration range of the stepper motor 3 can be determined, thereby achieving the purpose of real-time detection of the resonance intensity.

[0058] See Figure 4-Figure 5Furthermore, the fixed plate 18 is located in the placement groove 121, and the limiting member 19 includes a rotating plate 191 symmetrically arranged on one side of the fixed plate 18 in the radial N direction, a movable bar 192 rotatably connected to both ends of the rotating plate 191, a first limiting plate 193 arranged between two of the movable bars 192, a second limiting plate 194 arranged between the other two movable bars 192, a first roller 195 rotatably connected to the side wall of the first limiting plate 193, and a second roller rotatably connected to the side wall of the second limiting plate 194. 196, and a rotating motor 197 arranged in the middle of the side wall of one of the rotating plates 191; the output end of the rotating motor 197 can pass through the side wall of the fixed plate 18 and be connected to one of the rotating plates 191, and a through slot 181 is provided in the middle of the side wall of the fixed plate 18, and the two ends of the first limiting plate 193 can be rotatably connected to one end of two movable bars 192 away from the rotating plate 191, and the two ends of the second limiting plate 194 can be rotatably connected to one end of the other two movable bars 192 away from the rotating plate 191.

[0059] Among them, the rotating motor 197 is started, driving one of the rotating plates 191 to rotate, so that one of the rotating plates 191 can drive the movable bars 192 at both ends to rotate synchronously, and pull the first limit plate 193 and the second limit plate 194 closer to each other; in this process, when the first limit plate 193 and the second limit plate 194 are displaced, they will also drive the movable bars 192 at both ends of the other rotating plate 191 to rotate, so that the other rotating plate 191 starts to rotate around the middle of its side wall, so that the first roller 195 and the second roller 196 can gradually approach the stepping motor 3, limit the shaking range of the stepping motor 3 when resonance occurs, reduce the problem that the natural frequency and driving frequency of the stepping motor are still close to or equal to the resonance parameter due to various factors (such as signal frequency drift, signal interference, etc.), thereby increasing the resonance of the stepping motor, thereby reducing the influence of the increased resonance on the stepping motor 3, and improving the stability of the stepping motor 3 and the detection device.

[0060] Through the design of the first roller 195 and the second roller 196, when the outer wall of the stepper motor 3 resonates, it will impact the first roller 195 and the second roller 196, causing the first roller 195 and the second roller 196 to rotate, thereby reducing the friction during the impact.

[0061] See Figure 4-Figure 5Furthermore, a first slider 198 is symmetrically provided on the side wall of the first limiting plate 193 away from the first roller 195, and a first slide rail 1981 is provided on the side of the first slider 198 away from the first limiting plate 193, and the first slider 198 can slide on the corresponding first slide rail 1981, and the side of the first slide rail 1981 away from the first slider 198 can be connected to the fixed plate 18; a second slider 199 is symmetrically provided on the side wall of the second limiting plate 194 away from the second roller 196, and a second slide rail 1991 is provided on the side of the second slider 199 away from the second limiting plate 194, and the second slider 199 can slide on the corresponding second slide rail 1991, and the side of the second slide rail 1991 away from the second slider 199 can be connected to the fixed plate 18.

[0062] Among them, when the first limiting plate 193 and the second limiting plate 194 approach each other, the first limiting plate 193 will drive the first slider 198 to slide on the first slide rail 1981, and the second limiting plate 194 will drive the second slider 199 to slide on the second slide rail 1991, thereby achieving the purpose of guidance.

[0063] In the second embodiment, based on the technical solution of the first embodiment, it is still necessary to further solve the problem that when the driving load inertia of the stepper motor in the prior art is large, the stepper motor is prone to generate large vibration during the stop process after the detection is completed, thereby increasing the risk of resonance. To this end, the following solution is proposed:

[0064] See Figure 6-Figure 7 Furthermore, the end of the driving cylinder 21 away from the driving rod 22 can be rotatably connected to the inner wall of the placement groove 121, and a first column 122 is also provided in the placement groove 121. The middle part of the side wall of the driving rod 22 can be rotatably connected to the top of the first column 122. The first connecting plate 25 is located at one end of the bearing 23, and the sleeve 26 is located at the other end of the bearing 23; a second column 123 is provided in the placement groove 121, and the end of the connecting shaft 27 away from the sleeve 24 can be rotatably connected to the side wall of the second column 123. A connecting spring 271 is also provided on the connecting shaft 27, one end of the connecting spring 271 can be connected to the sleeve 26, and the other end can be connected to the side wall of the second column 123; sliding bars 241 are symmetrically provided on the inner wall of the sleeve 24, and long grooves 272 are symmetrically opened on the outer wall of the connecting shaft 27, and the sliding bars 241 can slide in the long grooves 272.

[0065] Among them, the driving cylinder 21 is started, pulling the driving rod 22, so that the driving rod 22 can rotate and deflect around the top of the first column 122, and drive the bearing 23 to approach the output shaft of the stepper motor 3, so that the sleeve 24, the first connecting plate 25 and the sleeve plate 26 can slide synchronously on the connecting shaft 27. During this process, the slide bar 241 will slide in the axial direction M in the long groove 272, and the connecting spring 271 will change from a free state to a stretched state; when the first connecting plate 25 and the second connecting plate 28 are spliced ​​together, the purpose of combining and splicing the connection between the output shaft of the stepper motor 3 and the load is achieved, and the stepper motor 3 The output shaft can drive the load to rotate through the first connecting disk 25 and the second connecting disk 28. At this time, the sleeve 24 and the connecting shaft 27 rotate in the radial direction N; on the contrary, the connecting spring 271 changes from a stretched state to a free state; when the first connecting disk 25 and the second connecting disk 28 are separated, the output shaft of the stepper motor 3 is separated from the load, thereby avoiding the problem that when the driving load inertia of the stepper motor is large, the stepper motor is prone to generate large vibrations during the stop process, which increases the risk of resonance, thereby reducing the resonant frequency of the stepper motor 3 and ensuring the stability of the stepper motor 3 and the detection device.

[0066] Example 3, see Figure 1-Figure 7 Furthermore, the limit component 1 and the connection component 2 are electrically connected to a monitoring control unit, which includes a signal receiving module, a signal analysis module and a signal processing module.

[0067] The signal receiving module monitors the noise and speed of the stepper motor and calculates the normal frequency range based on the speed. The signal receiving module includes a noise monitoring module installed on one side of the stepper motor. The signal receiving module monitors the noise frequency at the stepper motor through the noise monitoring module, generates and transmits spectrum diagram data; the noise monitoring module in this embodiment adopts the existing technology, and the noise monitoring modules that can be directly or improved by those skilled in the art can be applied to the system of this embodiment. No absolute limitation is made here on the specific structure of the noise monitoring module.

[0068] The signal analysis module receives the spectrum data transmitted by the signal receiving module, analyzes the data in the spectrum data, and generates and transmits a noise analysis data group;

[0069] The signal processing module receives the noise analysis data group transmitted by the signal analysis module, and the signal processing module controls the limit component 1 and the connection component 2 to limit and separate the stepping motor according to the noise analysis data group;

[0070] The noise analysis group data includes the frequency amplitude f and the frequency amplitude 2f;

[0071] The normal frequency calculation formula is:

[0072]

[0073] in, Indicates the normal frequency, n indicates the motor speed, p is the number of pulses corresponding to the motor step angle, and k is the normal coefficient. The value of k is between 58 and 62.

[0074] In practical applications, k is the theoretical reference coefficient of the motor frequency, which is usually 60. However, the motor's manufacturing tolerance, load fluctuations, or transmission mechanism clearance may cause speed fluctuations. Therefore, in the calculation, k is allowed to be adjusted within a certain range to adapt to the actual speed. The above calculation can be used to obtain the relevant normal frequency range.

[0075] For example, in actual calculations, if n decreases, k is increased to adapt; if n increases, k is decreased to adapt. The coefficient k is adjusted according to the actual movement of the motor speed, ultimately making the calculation range of the normal frequency more accurate.

[0076] See Figure 1-Figure 7 Furthermore, the signal processing module controls the limit component 1 and the connection component 2 to separate the limit and detection load of the stepper motor according to the noise analysis data group. The specific method is as follows:

[0077] If the noise analysis group data shows that the single-frequency amplitude f is within the normal frequency range of the stepper motor speed and the double-frequency amplitude 2f does not exceed 10% to 20% of the single-frequency amplitude f, it means that the stepper motor is operating normally and the signal processing module does not send instructions to the limit component 1 and the connection component 2;

[0078] If the noise analysis group data is: the single frequency amplitude f exceeds the normal frequency range of the stepper motor speed, and the double frequency amplitude 2f does not exceed 10% to 20% of the single frequency amplitude f (at this time, the output end of the stepper motor is connected to a load, but when the limit component 1 is started, it is not necessary to separate the output end of the stepper motor from the load), it means that the stepper motor has abnormal vibration at this time, and its vibration does not affect the connection between the output shaft of the stepper motor and the load. The signal processing module only sends instructions to the limit component 1, and controls the rotation motor 197 to start through the instructions, driving one of the rotating plates 191 to rotate, so that one of the rotating plates 191 can drive the movable bars 192 at both ends to rotate synchronously, and pull the first limit plate 193 and the second limit plate 194 closer to each other; in this process, the first limit When the plate 193 and the second limiting plate 194 are displaced, the movable bars 192 at both ends of the other rotating plate 191 are also driven to rotate, so that the other rotating plate 191 starts to rotate around the middle of its side wall, so that the first roller 195 and the second roller 196 can gradually approach the stepping motor 3, and the shaking range of the stepping motor 3 when resonance occurs is limited, thereby reducing the problem that the natural frequency and driving frequency of the stepping motor are still close to or equal to the resonance parameter due to various factors of the stepping motor (such as signal frequency drift, signal interference, etc.), thereby reducing the influence of the aggravated resonance on the stepping motor 3 and the detection device, improving the use stability of the stepping motor 3 and the detection device, and allowing the limiting component 1 to limit the vibration of the stepping motor;

[0079] If the noise analysis group data shows that the single-frequency amplitude f exceeds the normal frequency range of the stepper motor speed, and the double-frequency amplitude 2f exceeds 10% to 20% of the single-frequency amplitude f (at this time, the output end of the stepper motor is connected to a load, but the output end of the stepper motor can be separated from the load through the connecting component 2), it means that the stepper motor is vibrating abnormally, and its vibration also affects the connection between the output shaft of the stepper motor and the load. The signal processing module sends a command to the limit component 1 to limit the vibration of the stepper motor. At the same time, the signal processing module sends a command to the connecting component 2 to control the driving cylinder 21 to start, push the driving rod 22, and cause the driving rod 22 to deviate. The bearing 23 is driven away from the output shaft of the stepper motor 3, so that the sleeve 24, the first connecting disk 25 and the sleeve plate 26 slide synchronously on the connecting shaft 27, so that the first connecting disk 25 can be moved away from the second connecting disk 28. When the clamping groove 251 on the first connecting disk 25 is separated from the clamping groove 251 on the second connecting disk 28, the stepper motor 3 and the load are separated, thereby achieving the purpose of separating the output shaft of the stepper motor 3 from the load, avoiding the problem that when the driving load inertia of the stepper motor is large, the stepper motor is prone to generate large vibration during the stop process, increasing the risk of resonance, thereby reducing the resonant frequency of the stepper motor 3 and ensuring the stability of the stepper motor 3.

[0080] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

Claims

1. A device for detecting resonance of a stepping motor, characterized in that: include, A limit assembly (1), comprising a base frame (11), a bottom plate (12) arranged on the top of the base frame (11), a support plate (13) arranged in the base plate (12), support frames (14) symmetrically arranged on both sides of the support plate (13) in a radial direction, a bearing plate (141) arranged between the support frames (14), an adjustment member (15) symmetrically arranged on one side of the support plate (13) in an axial direction, a shock-absorbing spring (16) arranged at one end of the adjustment member (15) away from the support plate (13), a hole detection sensor (17) arranged on the side of the adjustment member (15) away from the support plate (13), a fixing plate (18) arranged in the base plate (12), and a limit member (19) arranged on a side wall of the fixing plate (18); and, A connecting assembly (2) is arranged in the base plate (12), comprising a driving cylinder (21), a driving rod (22) arranged at the telescopic end of the driving cylinder (21), a bearing (23) rotatably connected to the end of the driving rod (22) away from the driving cylinder (21), a sleeve (24) arranged in the bearing (23), a first connecting plate (25) arranged at one end of the sleeve (24), a sleeve plate (26) arranged at one end of the sleeve (24) away from the first connecting plate (25), and a connecting shaft (27) arranged in the sleeve (24); The adjusting member (15) includes an adjusting cylinder (151), an adjusting bar (152) provided at one end of the adjusting cylinder (151), an adjusting frame (153) provided at one end of the adjusting bar (152) away from the adjusting cylinder (151), and an adjusting roller (154) rotatably connected to the adjusting frame (153); Both ends of the adjustment cylinder (151) are open, the outer wall of the adjustment cylinder (151) can be connected to one side of the support plate (13), a detection hole (155) is provided on the side of the adjustment cylinder (151) away from the support plate (13), one end of the adjustment bar (152) away from the adjustment frame (153) can be plugged into the adjustment cylinder (151), and adjustment holes (156) are evenly provided on the side wall of the adjustment bar (152), the detection holes (155) can be aligned with the adjustment holes (156), the adjustment frame (153) is U-shaped, and both ends of the adjustment roller (154) can be rotatably connected to the U-shaped inner wall of the adjustment frame (153); One end of the adjustment bar (152) away from the adjustment frame (153) can be connected to the shock-absorbing spring (16), and one end of the shock-absorbing spring (16) away from the adjustment bar (152) can be connected to the inner wall of the placement groove (121). The hole detection sensor (17) is located on the side wall of the adjustment cylinder (151), and the hole detection sensor (17) can be aligned with the detection hole (155).

2. The device for detecting resonance of a stepping motor according to claim 1, wherein: A placement groove (121) is provided on the top of the bottom plate (12), the support plate (13) is located in the placement groove (121), the support plate (13) is arc-shaped, and the end of the support frame (14) away from the support plate (13) can be connected to the inner wall of the placement groove (121), and the end of the support frame (14) away from the placement groove (121) can be connected to the bottom of the carrier plate (141).

3. The device for detecting resonance of a stepping motor according to claim 2, wherein: The fixed plate (18) is located in the placement groove (121), and the limiting member (19) includes a rotating plate (191) symmetrically arranged on one side of the fixed plate (18) in a radial direction, a movable bar (192) rotatably connected to both ends of the rotating plate (191), a first limiting plate (193) arranged between two of the movable bars (192), a second limiting plate (194) arranged between the other two movable bars (192), a first roller (195) rotatably connected to the side wall of the first limiting plate (193), a second roller (196) rotatably connected to the side wall of the second limiting plate (194), and a rotating motor (197) arranged in the middle of the side wall of one of the rotating plates (191); The output end of the rotating motor (197) can pass through the side wall of the fixed plate (18) and be connected to one of the rotating plates (191). A through slot (181) is provided in the middle of the side wall of the fixed plate (18). The two ends of the first limiting plate (193) can be rotatably connected to one end of two of the movable bars (192) away from the rotating plate (191). The two ends of the second limiting plate (194) can be rotatably connected to one end of the other two movable bars (192) away from the rotating plate (191).

4. The device for detecting resonance of a stepping motor according to claim 3, wherein: A first slider (198) is symmetrically provided on the side wall of the first limiting plate (193) away from the first roller (195), and a first slide rail (1981) is provided on the side of the first slider (198) away from the first limiting plate (193). The first slider (198) can slide on the corresponding first slide rail (1981), and the side of the first slide rail (1981) away from the first slider (198) can be connected to the fixed plate (18); A second slider (199) is symmetrically arranged on the side wall of the second limiting plate (194) away from the second roller (196), and a second slide rail (1991) is arranged on the side of the second slider (199) away from the second limiting plate (194). The second slider (199) can slide on the corresponding second slide rail (1991), and the side of the second slide rail (1991) away from the second slider (199) can be connected to the fixed plate (18).

5. The device for detecting resonance of a stepping motor according to claim 2, wherein: One end of the driving cylinder (21) away from the driving rod (22) can be rotatably connected to the inner wall of the placement groove (121), and a first column (122) is also provided in the placement groove (121). The middle part of the side wall of the driving rod (22) can be rotatably connected to the top of the first column (122). The first connecting plate (25) is located at one end of the bearing (23), and the sleeve plate (26) is located at the other end of the bearing (23); A second column (123) is provided in the placement groove (121), and one end of the connecting shaft (27) away from the sleeve (24) can be rotatably connected to the side wall of the second column (123). A connecting spring (271) is also provided on the connecting shaft (27), and one end of the connecting spring (271) can be connected to the sleeve plate (26), and the other end can be connected to the side wall of the second column (123); Slide bars (241) are symmetrically provided on the inner wall of the sleeve (24), and long grooves (272) are symmetrically opened on the outer wall of the connecting shaft (27), and the slide bars (241) can slide in the long grooves (272).

6. The device for detecting resonance of a stepping motor according to claim 5, wherein: A clamping groove (251) is provided on the side wall of the first connecting disk (25) away from the sleeve (24), and a second connecting disk (28) is further provided on the side of the first connecting disk (25) away from the sleeve (24). The first connecting disk (25) and the second connecting disk (28) have equal structural sizes, and the first connecting disk (25) and the second connecting disk (28) are relatively distributed. The side of the second connecting disk (28) away from the first connecting disk (25) can be connected to the output shaft of the stepping motor (3).

7. The device for detecting resonance of a stepping motor according to claim 1, wherein: The limiting component (1) and the connecting component (2) are electrically connected to a monitoring control unit, and the monitoring control unit includes: A signal receiving module, the signal receiving module monitoring the noise and speed of the stepper motor and calculating a normal frequency range based on the speed, the signal receiving module including a noise monitoring module mounted on one side of the stepper motor, the signal receiving module monitoring the noise frequency at the stepper motor through the noise monitoring module, generating and transmitting spectrum data; a signal analysis module, the signal analysis module receiving the spectrum data transmitted by the signal receiving module, analyzing the data in the spectrum data, generating and transmitting a noise analysis data group; a signal processing module, the signal processing module receiving the noise analysis data group transmitted by the signal analysis module, and the signal processing module controlling the limit component (1) and the connection component (2) to perform limit and load separation on the stepping motor according to the noise analysis data group; The noise analysis data set includes a frequency amplitude f and a frequency amplitude 2f; The normal frequency calculation formula is: in, Indicates the normal frequency, n indicates the motor speed, p is the number of pulses corresponding to the motor step angle, and k is the normal coefficient. The value of k is between 58 and 62.

8. The device for detecting resonance of a stepping motor according to claim 7, wherein: The signal processing module controls the limit component (1) and the connection component (2) to limit and separate the stepper motor from the load according to the noise analysis data group, and the specific method is as follows: If the noise analysis data set shows that: the one-fold frequency amplitude f is within the normal frequency range of the stepper motor speed, and the two-fold frequency amplitude 2f does not exceed 10% to 20% of the one-fold frequency amplitude f, then it means that the stepper motor is operating normally at this time, and the signal processing module does not send instructions to the limit component (1) and the connection component (2); If the noise analysis data group shows that: the one-fold frequency amplitude f exceeds the normal frequency range of the stepper motor speed, and the two-fold frequency amplitude 2f does not exceed 10% to 20% of the one-fold frequency amplitude f, it indicates that the stepper motor has abnormal vibration, and the vibration does not affect the connection between the output shaft of the stepper motor and the load. The signal processing module only sends an instruction to the limit component (1), so that the limit component (1) limits the vibration of the stepper motor; If the noise analysis data group is: the one-fold frequency amplitude f exceeds the normal frequency range of the stepper motor speed, and the two-fold frequency amplitude 2f exceeds 10% to 20% of the one-fold frequency amplitude f, it means that the stepper motor has abnormal vibration at this time, and the vibration also affects the connection between the output shaft of the stepper motor and the load. The signal processing module sends an instruction to the limit component (1) to make the limit component (1) limit the vibration of the stepper motor. At the same time, the signal processing module sends an instruction to the connection component (2) to separate the stepper motor from the load.

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