Testing device and measuring method for basic output characteristics of ultrasonic tooth cleaning equipment

Abstract

The invention provides a testing device and a measuring method for basic output characteristics of ultrasonic tooth cleaning equipment. The testing device comprises a base, an adjusting mechanism, a clamping assembly, a pressure measuring assembly and an image measuring system. A light-transmitting area is arranged on the base, and the adjusting mechanism drives the clamping assembly to enable the working tip to be arranged above the light-transmitting area. The force measuring surface of the pressure measuring assembly adjustably acts on the tip end of the work tip, and the image measuring system collects contour images of the work tip through the contour light source and the camera. The measuring method comprises the steps of measuring device preparation, static reference establishment, control vibration excitation, main vibration offset measurement and semi-offset force measurement. Non-contact measurement is adopted, the tooth cleaner is horizontally fixed through the clamping assembly, the contour light source and the camera are matched to collect the contour image of vibration of the working tip in the vertical direction, and main vibration offset measurement and semi-offset force measurement are carried out. And the pressure measuring assembly can adjust the force measuring surface to stably advance, so that the measurement precision is improved, and the quality control and performance evaluation requirements in research and development and mass production stages are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of dental medical instruments, and in particular relates to a testing device and a measuring method for basic output characteristics of an ultrasonic tooth cleaning device. Background Art

[0002] With the widespread adoption of ultrasonic tooth cleaning technology, the vibration performance of the tooth scaler tip has become a key indicator affecting cleaning efficiency and product consistency. The core components of an ultrasonic tooth scaler include the piezoelectric ceramic transducer and the tooth tip, which operates by converting excitation voltage into tip vibration. However, in actual operation, the continuous friction between the tooth tip and the tooth surface generates heat, which can cause damage to the dental pulp. Therefore, ensuring that the device can generate and maintain stable maximum vibration excursion parameters and accurately verifying these parameters are crucial to ensuring clinical safety.

[0003] Accurately measuring the vibration deflection of the working tip and its vibration response under load is crucial during the R&D and mass production stages. Current industry measurement methods have significant limitations: The commonly used traditional manual measurement method requires leaving a vibration mark on a glass slide before measurement. This method not only results in large measurement errors, but also suffers from poor repeatability and significant human interference when gradually adding weights to measure the semi-deflection force. These technical bottlenecks severely restrict the accuracy and reliability of product quality control.

[0004] Patent document CN119326536A discloses an experimental platform for studying the dynamic performance of ultrasonic tooth scalers. This platform uses a single-point laser Doppler vibrometer to perform non-contact measurement of the tooth scaler tip. It also features a three-degree-of-freedom handle fixture, a spring-loaded assembly, and a force sensor to simulate the dynamic behavior of the tip under lateral pressure during tooth cleaning. However, this solution is primarily designed for clinical operation simulation, and the measurement target is limited to the lateral vibration response of a single local point. This makes it difficult to measure the main vibration offset characteristics of the tip in the vertical direction (the length of the tip) and its vibration change trend under different pressures. Furthermore, since the contact area between the tip and the tooth surface deposit sample remains unchanged during the measurement process, the tip's vibration resistance increases as the tip penetrates deeper, resulting in reduced measurement accuracy. This makes it difficult to meet the consistency, standardization, and automation requirements of quality control and performance evaluation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a testing device and measurement method for the basic output characteristics of ultrasonic tooth cleaning equipment, which can measure and calculate the main vibration offset characteristics in the vertical direction of the working tip, has high measurement accuracy, and is beneficial to product quality control and performance evaluation in the research and development and mass production stages.

[0006] A device for testing the basic output characteristics of an ultrasonic tooth cleaning device comprises a base, an adjustment mechanism, a clamping assembly, a pressure measuring assembly and an image measurement system; the base is provided with a light-transmitting area; the adjustment mechanism is arranged on the base; the clamping assembly is arranged on the adjustment mechanism, the clamping assembly is used to clamp and fix the handle of the tooth cleaning machine, and the adjustment mechanism is configured to drive the clamping assembly so that the working tip is placed in a three-dimensional space above the light-transmitting area; the pressure measuring assembly is arranged on the base, and the force measuring surface of the pressure measuring assembly can be adjusted to act on the tip of the working tip; the image measurement system comprises a contour light source located below the base and a camera located above the working tip, the contour light source is used to penetrate the light-transmitting area to illuminate the working tip, and the camera is located above the working tip and is used to capture an extended contour image of the working tip downward.

[0007] Furthermore, the adjustment mechanism includes an X-axis slide, a Y-axis slide and an R-axis rotation table. The X-axis slide is installed on the base, the Y-axis slide is installed on the X-axis slide, and the moving directions of the X-axis slide and the Y-axis slide are perpendicular to each other. The R-axis rotation table is arranged on the Y-axis slide, and the R-axis rotation table is configured to rotate around its own axis, and the rotation axis is perpendicular to the plane defined by the moving directions of the X-axis slide and the Y-axis slide.

[0008] Furthermore, the pressure measuring assembly includes an electric slide and a connecting frame. The moving direction of the electric slide is parallel to the moving direction of the X-axis slide. The connecting frame is arranged on the electric slide, and the force measuring surface is arranged on the connecting frame.

[0009] Furthermore, the pressure measuring assembly includes a force sensor, a glass slide and a display. The glass slide is fixedly attached to the front side of the sensor. The front side of the glass slide serves as a force measuring surface. The sensor and the display are communicated with each other, and the display is used to display the force applied by the working tip to the glass slide.

[0010] Furthermore, the image measurement system also includes a workbench and a mirror frame, the lower end of the mirror frame is connected to one side of the workbench, the upper end of the mirror frame extends above the workbench, the contour light source is installed inside the workbench, and the camera is installed on the mirror frame.

[0011] Furthermore, the clamping assembly includes a pressure plate and a fastening screw. The pressure plate is fixed to the upper end of the adjusting mechanism by the fastening screw. The upper end of the adjusting mechanism is provided with a lower trough body, and the lower end of the pressure plate is provided with an upper trough body opposite to the lower trough body. The handle of the dental cleaning machine is clamped and fixed between the upper trough body and the lower trough body.

[0012] The present invention also provides a method for measuring the basic output characteristics of an ultrasonic tooth cleaning device, which is implemented using the above-mentioned testing device for the basic output characteristics of an ultrasonic tooth cleaning device, and comprises the following steps:

[0013] S0. Measuring device preparation: Secure the ultrasonic scaler handle and adjust the working tip so that the direction of maximum vibration of the tip is perpendicular to the optical axis of the contour light source and the tip is perpendicular to the force measuring surface;

[0014] S1. Static benchmark establishment: Capture a static profile image of the tip in a non-vibrating state and measure the baseline profile edge spacing L1. Specifically, focus on position d on the tip no more than 1 mm from the apex. The reference line is centered on the tip profile boundary. L1 is the profile edge spacing passing through point d and perpendicular to the reference line.

[0015] S2. Control vibration excitation: Start the scaler to maximum power mode to excite the working tip vibration;

[0016] S3. Dynamic contact scanning: The force-sensing surface is driven to move at a constant speed, and the working tip is brought close to the force-sensing surface until the working tip contacts the force-sensing surface with a preset pressure. Specifically, the force-sensing surface moves at a constant speed of 0.1-1 mm / s along the measurement direction (X-axis direction), and the preset contact pressure is 0.15 N ± 0.02 N.

[0017] S4. Main vibration offset measurement: Capture the dynamic contour image and measure the contour edge spacing L2. Calculate the main vibration offset ΔL = L2 - L1. The method for measuring L2 is the same as that for measuring L1.

[0018] S5. Half-offset force measurement: Gradually increase the pressure of the working tip on the force measuring surface. When the vibration offset drops to 50% of ΔL, record the force value at this time as the half-offset force. When the vibration offset drops back to the range of L1×(1±10%), record the force value at this time as the half-offset force.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The use of an image measurement system for non-contact measurement can quickly acquire high-resolution contour images and perform precise analysis through image processing technology, further improving measurement accuracy. The scaler is horizontally clamped by a clamping component, and a light-transmitting area is opened on the base. The contour light source and camera are used together to collect the contour image generated by the vertical vibration of the working tip. The main vibration offset can then be calculated through contour image measurement.

[0021] 2. During the measurement process, the adjustable pressure measuring assembly can make the pressure measuring surface advance steadily at a certain rate, avoiding the tip of the working tip contacting the same part of the pressure measuring surface for a long time, vibrating and inserting too deep into the pressure measuring surface, and increasing the resistance of the working tip vibration. This is beneficial to product quality control and performance evaluation in the R&D and mass production stages. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of an embodiment of the present invention.

[0023] Figure 2 yes Figure 1 The structural diagram of the image measurement system is omitted.

[0024] Figure 3 yes Figure 2 Schematic diagram of the structure of the clamping component.

[0025] Numbers in the figure: 1. Base; 2. Light-transmitting area; 3. Adjustment mechanism; 4. Pressure measuring assembly; 5. Force measuring surface; 6. Image measurement system; 7. Display; 8. Contour light source; 9. Workbench; 10. Camera; 11. Mirror frame; 12. Connecting frame; 13. Force sensor; 14. Glass slide; 15. Electric slide; 16. X-axis slide; 17. Y-axis slide; 18. R-axis rotation table; 19. Clamping assembly; 20. Lower trough; 21. Press plate; 22. Upper trough. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] like Figures 1 to 3 As shown, a device for testing the basic output characteristics of an ultrasonic tooth cleaning device according to this embodiment includes a base 1, an adjustment mechanism 3, a clamping assembly 19, a pressure measuring assembly 4, and an image measurement system 6. A light-transmitting area 2 is provided on the base 1. The base 1 is a square plate with a directional hole in the middle serving as the light-transmitting area 2.

[0028] The pressure measuring assembly 4 is arranged on the base 1, and the force measuring surface 5 of the pressure measuring assembly 4 can be adjusted to act on the tip of the working tip. Specifically, the pressure measuring assembly 4 includes an electric slide 15 and a connecting frame 12. The connecting frame 12 is arranged on the electric slide 15, and the force measuring surface 5 is arranged on the connecting frame 12. The pressure measuring assembly 4 includes a force sensor 13, a glass slide 14 and a display 7. The glass slide 14 is fixedly attached to the front side of the sensor. The front side of the glass slide 14 serves as the force measuring surface 5. The sensor and the display 7 are connected in communication. The display 7 is used to display the force applied by the working tip to the glass slide 14. The glass slide 14 serves as a visual observation surface and a loading contact surface. It is driven by the electric slide 15 to avoid "eating the film" and interference caused by excessive resistance, which can improve the accuracy of semi-offset force measurement.

[0029] Adjustment mechanism 3 is mounted on base 1 and includes an X-axis slide 16, a Y-axis slide 17, and an R-axis rotary table 18. The X-axis slide 16 is mounted on base 1, with the motorized slide 15 moving in a direction parallel to that of the X-axis slide 16. The Y-axis slide 17 is mounted on the X-axis slide 16, with the two slides moving in directions perpendicular to each other. The R-axis rotary table 18 is mounted on the Y-axis slide 17 and is configured to rotate about its own axis, with this axis of rotation being perpendicular to the plane defined by the movement directions of the X-axis slides 16 and Y-axis slides 17. Furthermore, each of the X-axis slide 16, Y-axis slide 17, and R-axis rotary table 18 is equipped with a helical differential adjustment head to improve the spatial positioning accuracy of the working tip.

[0030] The clamping assembly 19 is provided on the adjustment mechanism 3. The clamping assembly 19 is used to clamp and fix the handle of the dental scaler. The adjustment mechanism 3 is configured to drive the clamping assembly 19 so that the working tip is placed in the three-dimensional space above the light-transmitting area 2. The clamping assembly 19 includes a pressure plate 21 and a fastening screw. The pressure plate 21 is fixed to the upper end of the adjustment mechanism 3 by the fastening screw. The upper end of the adjustment mechanism 3 is provided with a lower groove body 20. The lower end of the pressure plate 21 is provided with an upper groove body 22 opposite to the lower groove body 20. The handle of the dental scaler is clamped and fixed between the upper groove body 22 and the lower groove body 20. By adjusting the fastening screw, the distance between the pressure plate 21 and the lower groove body 20 can be flexibly adjusted to accommodate dental scaler handles of different sizes and shapes. This adjustability makes the clamping assembly 19 widely applicable to various models of dental scalers, improving the versatility and applicability of the device.

[0031] The image measurement system 6 includes a contour light source 8, a workbench 9, a camera 10, and a frame 11. The lower end of the frame 11 is connected to one side of the workbench 9, and the upper end of the frame 11 extends above the workbench 9. The contour light source 8 is mounted inside the workbench 9, and the camera 10 is mounted on the frame 11. The base 1 is placed on the workbench 9, so that the contour light source 8 is located below the base 1 and the camera 10 is located above the working tip. This arrangement enables non-contact measurement, allowing for real-time acquisition of the dynamic and static profiles of the working tip, thereby facilitating the calculation of the primary vibration offset. Generally, the image measurement system 6 includes a computer for storing captured images and processing image data. The computer is equipped with measuring ruler software to measure the vibration offset on the image.

[0032] Based on the above-mentioned device for testing the basic output characteristics of an ultrasonic tooth cleaning device, a method for testing the basic output characteristics of an ultrasonic tooth cleaning device is provided, which includes the following steps:

[0033] S0. Preparing the measuring device: Secure the ultrasonic scaler handle between the upper and lower slots of the adjustment mechanism 3 using the clamping assembly 19. Loosen the screws to adjust the handle angle so that the direction of maximum vibration of the working tip is perpendicular to the optical axis of the contour light source 8. Next, adjust the R-axis rotary stage so that the plane of the working tip is parallel to the X-axis force measuring surface 5, ensuring that the tip is perpendicular to the force measuring surface. Lock the X-axis slide and R-axis rotary stage to complete the mechanical positioning.

[0034] S1. Static datum establishment: Start the image measurement system 6, ensure that the contour light source 8 can evenly illuminate the working tip, adjust the image measurement instrument worktable and the focal length of the camera 10, and focus on the tip of the working tip at a position d no more than 1 mm from its apex. Center the reference line at the edge of the tip contour. In a non-vibrating state, capture a static contour image, passing through point d and perpendicular to the reference line direction. Measure the contour edge spacing length L1 and store it as the benchmark data.

[0035] S2. Control vibration excitation: Set the dental scaler to the maximum power mode, step on the foot switch of the dental scaler to excite the working tip to vibrate.

[0036] S3. Dynamic Contact Scanning: Start the motorized slide 15 so that the force measuring surface 5 slides uniformly along the measuring direction (X-axis) at a speed of 0.1-1 mm / s. Simultaneously, slowly rotate the high-precision Y-axis knob to push the working tip into contact with the force measuring surface at a preset pressure of 0.15 N ± 0.02 N.

[0037] S4. Main vibration offset measurement: Keep the contour light source 8 and camera 10 turned on, capture the dynamic contour image, and use the image measuring instrument ruler to measure, with the tip no more than 1 mm from position d. Measure the contour edge spacing length L2 through point d and perpendicular to the reference line. Calculate the main vibration offset: ΔL = L2 - L1 (for example: L2 = 253 μm, L1 = 133 μm, ΔL = L2 - L1 = 120 μm).

[0038] S5. Half-offset force measurement: Adjust the high-precision Y-axis platform and apply gradually increasing pressure to the force measuring surface at a constant speed. Observe the contour shadow using an image measuring instrument. When the vibration offset drops below 50% of the main vibration offset, or when the vibration offset falls within 105%-115% of the static reference value L1, record the displayed force value at this time. This value is recorded as the half-offset force. For example, the half-offset force is 8N.

[0039] Finally, based on the measurement results, a detailed analysis report is generated, including key parameters such as the main vibration offset and semi-offset force of the working tip, providing a basis for performance evaluation and optimization of the dental scaler.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for testing the basic output characteristics of an ultrasonic tooth cleaning device, characterized in that: include: A base, wherein a light-transmitting area is provided on the base; an adjusting mechanism, disposed on the base; a clamping assembly disposed on the adjustment mechanism, the clamping assembly being used to clamp and fix the handle of the dental scaler, the adjustment mechanism being configured to drive the clamping assembly so that the working tip is placed in the three-dimensional space above the light-transmitting area; A pressure measuring assembly is arranged on the base, and a force measuring surface of the pressure measuring assembly can adjustably act on the tip of the working tip; The image measurement system includes a contour light source located below the base and a camera located above the working tip. The contour light source is used to penetrate the light-transmitting area to illuminate the working tip. The camera is located above the working tip and is used to shoot an extended contour image of the working tip downward.

2. The device for testing basic output characteristics of ultrasonic tooth cleaning equipment according to claim 1, characterized in that: The adjustment mechanism includes an X-axis slide, a Y-axis slide and an R-axis rotation table. The X-axis slide is installed on the base, the Y-axis slide is installed on the X-axis slide, and the moving directions of the X-axis slide and the Y-axis slide are perpendicular to each other. The R-axis rotation table is arranged on the Y-axis slide, and the R-axis rotation table is configured to rotate around its own axis, and the rotation axis is perpendicular to the plane defined by the moving directions of the X-axis slide and the Y-axis slide.

3. The device for testing basic output characteristics of ultrasonic tooth cleaning equipment according to claim 2, characterized in that: The pressure measuring assembly includes an electric slide and a connecting frame. The moving direction of the electric slide is parallel to the moving direction of the X-axis slide. The connecting frame is arranged on the electric slide, and the force measuring surface is arranged on the connecting frame.

4. The device for testing basic output characteristics of ultrasonic tooth cleaning equipment according to claim 3, characterized in that: The pressure measuring assembly includes a force sensor, a glass slide and a display. The glass slide is fixedly attached to the front side of the sensor, and the front side of the glass slide serves as the force measuring surface. The sensor and the display are communicatively connected, and the display is used to display the force applied by the working tip to the glass slide.

5. The device for testing basic output characteristics of ultrasonic tooth cleaning equipment according to claim 1, characterized in that: The image measurement system also includes a workbench and a frame, the lower end of the frame is connected to one side of the workbench, the upper end of the frame extends above the workbench, the contour light source is installed inside the workbench, and the camera is installed on the frame.

6. The device for testing basic output characteristics of ultrasonic tooth cleaning equipment according to claim 1, characterized in that: The clamping assembly includes a pressure plate and a fastening screw. The pressure plate is fixed to the upper end of the adjustment mechanism by the fastening screw. The upper end of the adjustment mechanism is provided with a lower trough body, and the lower end of the pressure plate is provided with an upper trough body opposite to the lower trough body. The handle of the dental cleaning machine is clamped and fixed between the upper trough body and the lower trough body.

7. A method for measuring the basic output characteristics of an ultrasonic tooth cleaning device, using the testing device for the basic output characteristics of an ultrasonic tooth cleaning device according to claims 1 to 6, characterized in that: The following steps are involved: S0. Measuring device preparation: Secure the ultrasonic scaler handle and adjust the working tip so that the direction of maximum vibration of the tip is perpendicular to the optical axis of the contour light source and the tip is perpendicular to the force measuring surface; S1. Static reference establishment: Capture a static profile image of the tip of the working tip in a non-vibrating state and measure the reference profile edge line spacing L1; S2. Control vibration excitation: Start the scaler to maximum power mode to excite the working tip vibration; S3. Dynamic contact scanning: The force measuring surface is driven to move at a constant speed, and the working tip approaches the force measuring surface until the working tip contacts the force measuring surface with a preset pressure. S4. Main vibration offset measurement: Capture dynamic contour images and measure the contour edge spacing L2, and calculate the main vibration offset ΔL = L2-L1; S5. Half-offset force measurement: Gradually increase the pressure of the working tip on the force measuring surface. When the vibration offset drops to 50% of ΔL, record the force value at this time as the half-offset force. When the vibration offset drops back to the range of L1×(1±10%), record the force value at this time as the half-offset force.

8. The method for measuring the basic output characteristics of an ultrasonic tooth cleaning device according to claim 7, characterized in that: In step S1: the focus position is the position d on the tip of the working tip that is no more than 1 mm away from the vertex, the reference line is centered on the tip contour boundary, and L1 is the distance between the contour edges passing through point d and perpendicular to the reference line direction.

9. The method for measuring the basic output characteristics of an ultrasonic tooth cleaning device according to claim 7, wherein: In step S3, the force measuring surface moves uniformly along the measuring direction at a speed of 0.1-1 mm / s, and the preset contact pressure is 0.15 N ± 0.02 N.

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