Driving mechanism optimization method for reducing operation noise of electric sofa

Abstract

The invention discloses a driving mechanism optimization method for reducing the running noise of an electric sofa. The driving mechanism optimization method for reducing the running noise of the electric sofa comprises the following steps: step 1, optimizing a mechanical connection structure of a driving mechanism of the electric sofa; 2, acoustic optimization is carried out on a transmission device of the driving motor; 3, a motor fixing structure is improved; 4, tension adjustment is conducted on a transmission chain or a belt around the driving mechanism; 5, adding a wear-resistant noise-reducing coating or plating on the surface of the key component of the driving mechanism; sixthly, a sound insulation cover is additionally arranged outside the driving mechanism; vII, optimizing frequency control parameters of the driving signals. According to the method, vibration in a transmission path is effectively buffered through the design of a flexible coupling, and the source of noise is reduced; transmission noise is remarkably reduced through high-precision machining and material optimization of the gear; the design of the double-layer shock pad remarkably isolates the influence of motor vibration on the sofa framework.

Description

Technical Field

[0001] The invention relates to the technical field of electric sofas, and in particular to a driving mechanism optimization method for reducing the running noise of an electric sofa. Background Art

[0002] The electric sofa is a kind of furniture that combines the comfort of traditional sofas with the intelligent functions of modern technology. It can automatically adjust the angle of the sofa through the motor drive system. It is widely used in scenes such as homes, cinemas, offices, etc., aiming to provide users with a higher level of comfort experience.

[0003] During the operation of the existing electric sofa, due to the unreasonable design of the mechanical transmission structure between the drive mechanism and the motor, or the transmission of the motor vibration to the sofa frame, the operating noise is too loud, affecting the user experience. Although the motor transmission system has been optimized in the prior art, it is still unable to effectively reduce high-frequency noise and vibration noise, especially after long-term use, the noise problem is more significant. Summary of the invention

[0004] The object of the present invention is to provide a method for optimizing a driving mechanism for reducing the operating noise of an electric sofa, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for optimizing a driving mechanism for reducing the operating noise of an electric sofa, wherein the method for optimizing a driving mechanism for reducing the operating noise of an electric sofa comprises the following steps: Step 1: Optimize the mechanical connection structure of the electric sofa drive mechanism by using a flexible coupling instead of the traditional rigid coupling to reduce vibration and noise; Step 2: Acoustically optimize the transmission device of the drive motor, select high-precision gears and add vibration-damping coatings; Step 3: Improve the motor fixing structure and use double-layer shock-absorbing pads to isolate the hard contact between the motor and the sofa frame; Step 4: Adjust the tension of the transmission chain or belt around the drive mechanism to avoid vibration noise caused by relaxation; Step 5: Add wear-resistant and noise-reducing coatings or plating on the surfaces of key components of the drive mechanism; Step 6: Add a soundproof cover to the outside of the drive mechanism and add sound-absorbing materials inside; Step 7: Optimize the frequency control parameters of the driving signal and reduce the noise peak value through the frequency conversion algorithm.

[0006] As a preferred technical solution of the present invention, the elastic material of the flexible coupling is selected from polyurethane with high fatigue resistance, and the thickness is optimized within a range of 2 mm to 5 mm.

[0007] As a preferred technical solution of the present invention, the surface roughness Ra value of the gear in the transmission device is optimized to 0.2μm to 0.4μm, and the gear is made of a low-noise metal material with strong wear resistance, such as 20CrMnTi, and is carburized and quenched.

[0008] As a preferred technical solution of the present invention, the double-layer shock-absorbing pad includes a layer of silicone pad and a layer of PU foam pad, the hardness of the silicone pad ranges from 40 to 60 Shore hardness, and the thickness of the PU foam pad ranges from 5 mm to 10 mm.

[0009] As a preferred technical solution of the present invention, the tension adjustment of the transmission chain is achieved by setting up an automatic tensioning mechanism, which adopts a spring loading structure, and the stiffness coefficient of the spring is 100N / m to 300N / m.

[0010] As a preferred technical solution of the present invention, the wear-resistant and noise-reducing coating is made of modified polytetrafluoroethylene, the coating thickness is controlled at 50 μm to 100 μm, and is coated on the surface of the transmission parts of the drive mechanism.

[0011] As a preferred technical solution of the present invention, the sound insulation cover is made of high-density ABS material, and sound-absorbing cotton is adhered to the inner surface thereof, and the thickness of the sound-absorbing cotton is 20 mm to 30 mm.

[0012] As a preferred technical solution of the present invention, the optimization of the frequency conversion algorithm includes reducing the frequency rise and fall rate when the motor starts and stops, and the specific control range is 1 Hz / s to 5 Hz / s.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: a driving mechanism optimization method for reducing the operating noise of an electric sofa according to the present invention effectively buffers the vibration in the transmission path and reduces the source of noise through the design of a flexible coupling; high-precision processing and material optimization of gears significantly reduce transmission noise; the double-layer shock-absorbing pad design significantly isolates the influence of motor vibration on the sofa frame; the automatic tensioning mechanism ensures the stability of the transmission chain and avoids abnormal noise caused by relaxation; the wear-resistant noise-reducing coating and soundproof cover design further reduce the operating noise; and the frequency conversion control optimization effectively suppresses the noise peaks in the start and stop stages. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0015] The present invention provides a method for optimizing the driving mechanism of an electric sofa to reduce the operating noise. The specific operation steps are as follows: Example 1: Optimization and installation of flexible coupling Use polyurethane with high fatigue resistance as the coupling elastomer material to ensure that the material is durable and has good shock absorption performance; the thickness of the polyurethane elastomer should be in the range of 2 mm to 5 mm, and the design should be optimized according to the load weight and motor power of the electric sofa; calculate the inner and outer diameters of the flexible coupling according to the connection dimensions of the motor output shaft and the transmission parts, and process the coupling through precision CNC machine tools to ensure that its roundness tolerance is within 0.01 mm; disassemble the original rigid coupling and clean the interface between the drive shaft and the gearbox input shaft. Put the flexible coupling into the motor drive shaft and fix it with high-strength bolts. Check the coaxiality of the coupling to ensure that it does not deviate from the center line by more than 0.02 mm.

[0016] Embodiment 2: Processing and installation of high-precision gears; select wear-resistant metal materials such as 20CrMnTi, improve the durability of the gears by carburizing and quenching, and perform rough processing on the gear blank to ensure the initial dimensional accuracy; after the gear processing is completed, use ultra-precision polishing technology to optimize the gear surface roughness Ra value to 0.2 μm to 0.4 μm, add a wear-resistant coating such as modified polytetrafluoroethylene, and control the coating thickness to 50 μm to 100 μm, install the gear into the transmission mechanism, adjust the meshing clearance of the gear to the recommended value (usually 0.02 mm to 0.05 mm), and use a gear noise tester to detect the operating noise. If it exceeds the expected value, further adjust the meshing accuracy.

[0017] Example 3: Design and installation of double-layer shock-absorbing pads Preparation of shock-absorbing pad materials: Silicone pad: the hardness is selected to be 40 to 60 Shore hardness to ensure that it has good shock-absorbing performance, PU foam pad: the thickness is 5 mm to 10 mm, and it has the ability to absorb high-frequency vibrations; cut the silicone pad and PU foam pad according to the size of the motor base, and the shape must completely cover the motor base. Combine the silicone pad and PU foam pad with high-strength glue or hot pressing to form a double-layer structure, place the shock-absorbing pad between the contact surface of the motor and the sofa frame, and when using bolts to fix the motor, ensure that the bolt preload is evenly distributed to avoid uneven force on the shock-absorbing pad.

[0018] Embodiment 4: Design and adjustment of automatic tensioning mechanism: Use a spring-loaded tensioner, design the spring stiffness coefficient to be 100 N / m to 300 N / m, and ensure that the travel of the tensioner can adapt to the maximum telescopic range of the electric sofa drive chain or belt; fix the tensioning mechanism beside the path of the transmission chain or belt, adjust the initial tension of the tensioning mechanism, so that the chain maintains moderate tension (usually 2% to 5% initial pre-tension) under working conditions; during operation, monitor the displacement changes of the tensioner to ensure that it automatically adjusts the chain tightness.

[0019] Embodiment 5: Design and installation of soundproof cover: The soundproof cover is made of high-density ABS material, and the design shape matches the appearance of the driving mechanism to ensure that there is enough heat dissipation space inside the cover. Sound-absorbing cotton is attached inside, and the thickness of the sound-absorbing cotton is 20 mm to 30 mm; the soundproof cover is fixed to the sofa frame with bolts or clips, and the gap between the soundproof cover and the driving mechanism is checked. If necessary, sealing strips are added, ventilation holes are designed at appropriate positions of the soundproof cover, and a muffler is installed in the hole to ensure heat dissipation while reducing noise leakage.

[0020] Example 6: Optimization of frequency conversion control algorithm: adjust the frequency rise and fall rate in the motor frequency conversion algorithm, with the optimization range of 1 Hz / s to 5 Hz / s, reduce the impact noise in the start and stop stages, set the smooth transition time for start and stop in the motor controller (the recommended value is 2 seconds to 4 seconds), adjust the operating frequency range to prevent the motor from entering the resonant frequency (usually 25Hz to 35 Hz), and use a spectrum analyzer to detect the motor operation noise curve to verify whether the peak noise is effectively reduced after optimization.

[0021] Example 7: Comprehensive noise testing and adjustment: Use a decibel meter and spectrum analyzer to detect the noise during the operation of the sofa. Record the noise values ​​of the drive mechanism during the start, operation and stop stages respectively; if the noise is still higher than the design target, recheck the flexible coupling, gear meshing, shock pad installation and soundproof cover sealing, and adjust them one by one.

[0022] The present invention aims at the noise problem caused by the driving mechanism during the operation of the electric sofa, and proposes a comprehensive and systematic optimization method, which makes improvements in material selection, structural design, operation control and installation process. This method not only solves the noise problem caused by rigid connection, inaccurate meshing and vibration transmission in the traditional driving mechanism, but also takes into account the comfort and long-term reliability of the electric sofa.

[0023] First, by using a flexible coupling instead of a traditional rigid coupling, the impact force between the motor drive shaft and the transmission components is effectively buffered, reducing high-frequency vibration and noise during operation. The processing and surface roughness optimization of high-precision gears further improve the efficiency of the transmission system while reducing gear meshing noise. In addition, the design of the double-layer shock-absorbing pad and soundproof cover takes into account the isolation of low-frequency and high-frequency noise, achieving multi-level protection of noise control.

[0024] Secondly, at the control system level, the present invention optimizes the frequency conversion algorithm of the motor, making the start and stop process of the drive mechanism smoother and avoiding the noise spike problem caused by too fast frequency change. By introducing the automatic tensioning mechanism, the noise hidden danger caused by loose or over-tightened chain in the traditional drive system is solved, further improving the stability and durability of operation.

[0025] Compared with the prior art, the present invention has significant innovation and practicality. It not only achieves a qualitative improvement in noise control effect, but also has a strong universality in the optimization process, and can be widely used in noise reduction needs of various motor-driven equipment. Especially in application scenarios such as electric sofas, which have high requirements for comfort and quietness, the optimization method shows excellent performance and application value.

[0026] The optimization method provided by the present invention can control the operating noise of the electric sofa drive mechanism to below 35 decibels, which is significantly lower than similar products on the market. At the same time, in a simulated long-term use environment, the optimized drive mechanism showed stable performance, without noise rebound or mechanism failure, which reflects the reliability and durability of the method in actual use.

[0027] In summary, the present invention has conducted an in-depth analysis of the causes of noise in the operation of electric sofas, and has embodied a balance between structure, functionality and operability in the technical solution design. It provides an operational technical reference for the silent design of modern household products, and lays a solid foundation for improving user experience and promoting technological progress in the industry.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for optimizing a driving mechanism for reducing the operating noise of an electric sofa, characterized in that: The method steps for optimizing the driving mechanism for reducing the operating noise of the electric sofa are as follows: Step 1: Optimize the mechanical connection structure of the electric sofa drive mechanism by using a flexible coupling instead of the traditional rigid coupling to reduce vibration and noise; Step 2: Acoustically optimize the transmission device of the drive motor, select high-precision gears and add vibration-damping coatings; Step 3: Improve the motor fixing structure and use double-layer shock-absorbing pads to isolate the hard contact between the motor and the sofa frame; Step 4: Adjust the tension of the transmission chain or belt around the drive mechanism to avoid vibration noise caused by relaxation; Step 5: Add wear-resistant and noise-reducing coatings or plating on the surfaces of key components of the drive mechanism; Step 6: Add a soundproof cover to the outside of the drive mechanism and add sound-absorbing materials inside; Step 7: Optimize the frequency control parameters of the driving signal and reduce the noise peak value through the frequency conversion algorithm.

2. The method for optimizing the driving mechanism for reducing the operating noise of an electric sofa according to claim 1, characterized in that: The elastic material of the flexible coupling is made of polyurethane with high fatigue resistance, and the thickness is optimized within a range of 2 mm to 5 mm.

3. The method for optimizing the driving mechanism for reducing the operating noise of an electric sofa according to claim 1, characterized in that: The surface roughness Ra value of the gear in the transmission device is optimized to be 0.2 μm to 0.4 μm. The gear is made of a low-noise metal material with strong wear resistance, such as 20CrMnTi, and is carburized and quenched.

4. The method for optimizing the driving mechanism for reducing the operating noise of an electric sofa according to claim 1, characterized in that: The double-layer shock-absorbing pad comprises a layer of silicone pad and a layer of PU foam pad, the hardness of the silicone pad ranges from 40 to 60 Shore hardness, and the thickness of the PU foam pad ranges from 5 mm to 10 mm.

5. The method for optimizing the driving mechanism for reducing the operating noise of an electric sofa according to claim 1, characterized in that: The tension adjustment of the transmission chain is achieved by setting an automatic tensioning mechanism, which adopts a spring loading structure, and the stiffness coefficient of the spring is 100N / m to 300N / m.

6. The method for optimizing the driving mechanism for reducing the operating noise of an electric sofa according to claim 1, characterized in that: The wear-resistant and noise-reducing coating is made of modified polytetrafluoroethylene, and the coating thickness is controlled to be between 50 μm and 100 μm, and is coated on the surface of the transmission parts of the driving mechanism.

7. The method for optimizing the driving mechanism for reducing the operating noise of an electric sofa according to claim 1, characterized in that: The sound insulation cover is made of high-density ABS material, and sound-absorbing cotton is adhered to its inner surface, and the thickness of the sound-absorbing cotton is 20mm to 30mm.

8. The method for optimizing the driving mechanism for reducing the operating noise of an electric sofa according to claim 1, characterized in that: The optimization of the frequency conversion algorithm includes reducing the frequency rise and fall rate when the motor starts and stops, and the specific control range is 1 Hz / s to 5 Hz / s.