6 results about "Industrial noise" patented technology

This invention discloses a low-frequency noise reduction and sound insulation device for industrial applications, belonging to the field of noise control technology. The device includes an outer soundproof cover, an inner composite sound-absorbing structure, and an active noise control system. The outer soundproof cover is constructed of high-density board. The inner composite sound-absorbing structure is located on the inner wall of the outer soundproof cover and includes an acoustic metamaterial layer and a micro-perforated plate layer, which are spaced apart to form a first resonant cavity. The active noise control system includes: an error microphone embedded in the inner wall of the outer soundproof cover; a controller electrically connected to the error microphone; and a secondary sound source electrically connected to the controller and installed on the inner wall of the outer soundproof cover. This invention achieves broadband passive sound absorption through the composite structure of acoustic metamaterial and micro-perforated plate, providing a high signal-to-noise ratio environment for the active control system. Furthermore, the active control system based on the FxLMS algorithm precisely cancels residual low-frequency line spectra, achieving efficient and stable low-frequency noise reduction.

The application relates to the technical field of industrial earmuffs, and provides an industrial noise reduction earmuff with working condition self-adaptive adjustment, which comprises a supporting block arranged on a safety cap shell, an adjusting unit arranged on the outer surface of the supporting block and used for adjusting the sealing effect of the earmuff and the human body, an earmuff shell fixedly connected to the bottom of the adjusting unit, a decibel detector fixedly connected to the outer side of the earmuff shell, a detection ring connected to the decibel detector through an electric wire, sound-absorbing cotton placed in the interlayer of the earmuff shell, and an air inflation air bag fixedly connected to the inner side of the earmuff shell; a first adjusting unit and a second adjusting unit arranged on the inner wall of the earmuff shell; the sound-absorbing cotton can absorb part of the noise from the outside, and the detection ring can detect the size of the external noise so as to drive the adjusting unit, the first adjusting unit and the second adjusting unit to work, and the noise reduction effect is self-adjusted according to the actual working condition.

This invention discloses a composite sound insulation and vibration damping board, its preparation method, and its application, belonging to the field of building and industrial noise control materials. The board comprises, from top to bottom, an upper sound insulation layer, a middle matrix layer, and a lower vibration damping layer, which are bonded together using a water-based adhesive; the upper sound insulation layer has a density of 30-60 kg / m³. 3 The polyurethane foam board has an intermediate matrix layer composed of cement-based cloth, fiber cloth, non-woven fabric, plastic film, or aluminized film, and a lower shock-absorbing layer with a density of 15-25 kg / m³. 3 EPP foam board. This board combines the sound insulation and heat preservation properties of polyurethane, the sound insulation enhancement of the middle matrix layer, and the shock absorption and cushioning properties of EPP through a three-layer composite material. It has good sound insulation, shock absorption and heat preservation performance, and is suitable for building and industrial applications with requirements for comprehensive performance.

This invention belongs to the field of industrial noise control technology and discloses an active noise control method for vibration noise in precast beam factories. The method includes the following steps: S1, signal preprocessing and frequency band focusing; S2, secondary path identification and modeling; S3, calculation of the filtered reference signal; S4, initialization of control parameters; S5, calculation of the desired signal for the main path; S6, main loop processing. The beneficial effects of this invention are as follows: 1. An adaptive divergence detection mechanism based on error signal energy monitoring is introduced into the traditional SAS-FxLMS algorithm. When the error energy exceeds a preset multiple of the original energy, the algorithm is determined to be diverging, and a recovery mechanism is automatically triggered. 2. When the norm exceeds a preset threshold, the weight vector is scaled proportionally to reduce its norm to within the threshold range, ensuring the numerical stability of the algorithm. 3. The transfer function models of the main path and secondary paths are optimized according to the characteristics of the target frequency band center frequency (150Hz); the algorithm parameters are dynamically adjusted according to the peak factor, RMS value, and other characteristic parameters of the input signal.

This utility model discloses a shuttle lifting mechanism, comprising: a frame, a set of support frames vertically mounted on the frame, a first gear rotatably mounted above the support frames, a second gear rotatably mounted on the frame, a toothed belt connecting the first gear and the second gear, and a first drive assembly for driving the second gear to rotate. By combining reliability and quiet performance, the self-healing toothed assembly extends the life of the toothed belt to more than four times that of traditional toothed belts, significantly reducing replacement costs. The quiet component eliminates industrial noise pollution while maintaining high torque transmission, meeting stringent requirements for the working environment. Compared to existing chain or ordinary toothed belt solutions, it completely avoids the risk of wire rope breakage and the hidden danger of gear disengagement.

The utility model belongs to the technical field of organic fertilizer, especially an organic fertilizer grinding device, including frame and fixed on the frame's grinding jar, the inside setting of grinding jar has grinding mechanism, the grinding mechanism includes the breaker plate with bevel gear, the rotation of breaker plate carries out preliminary crushing to fertilizer, through setting monitoring mechanism, the pressure that produces in real time monitoring grinding, pressure sensor and round plate fixed mounting, its fixed, pressure sensor is located in the protection frame inside, its protection, the model of pressure sensor can select piezoelectric sensor, and it is suitable for high frequency pressure change, and response speed is fast, and it is suitable for dynamic pressure monitoring in the grinding process, and the model of siren can adopt Honeywell XLS100 series audible -visual alarm, and its sound pressure is greater than or equal to 120dB, and visible distance is greater than or equal to 10 meters, and it is suitable for industrial noise environment.