47results about How to "Suppress high frequency vibration" patented technology

The invention discloses a special automobile rubber grinding machine for a rubber covered roller. The special automobile rubber grinding machine comprises a lathe head and a lathe bed which are sequentially connected, wherein the lathe head is provided with a headstock, the lathe bed is provided with a tailstock, and a workpiece is fixed between the headstock and the tailstock; the lathe bed below the workpiece is provided with a large planker, a sliding block and a gear are arranged on the large planker, the lathe bed is provided with a linear guide rail and a rack, the sliding block is matched with the linear guide rail, and the gear is matched with the rack; the large planker is provided with a premedial planker and a postmedial planker which can move on the large planker, the premedial planker is provided with a knife rest, and the postmedial planker is provided with a belt sanding machine. According to the special automobile rubber grinding machine, the firmness between a bonding agent and a central spindle can be guaranteed, a traditional sand blasting technology can be replaced, and the surface is not needed to be washed by any solvent, so that the balance of the central spindle can not be damaged, the production efficiency can be improved, the cost is reduced and the labor force is saved, and the key is that the bonding between the rubber and the central spindle can be reliably guaranteed. According to the special automobile rubber grinding machine, the consumable materials can be saved and the environment pollution can be reduced.

A six-degree-of-freedom parallel stable seat mainly includes a seat, an armrest, a base, six driving branches connecting the seat and the base, and four spring bearing branches. Among the six drive branches, four SPSP drive branches with the same structure are arranged on both sides of the seat, and two SPS drive branches with the same structure are arranged under the seat; the four drive branches arranged on both sides of the seat, One end is connected to the outside of the armrest through a ball hinge, and the other end is vertically installed on the base; the two drive branches arranged under the seat are connected at one end to the bottom of the seat through a ball hinge, and the other end is connected to the bottom of the seat through a ball hinge. It is connected with the rear side of the base; the four spring-loaded branches are SPS branches with the same structure, and the two ends of them are respectively connected with the bottom and the base of the seat through spherical hinges. The invention has a simple and compact structure, effectively reduces the height of the seat from the ground, and the existence of the spring bearing branch greatly improves the load-bearing capacity of the seat, and has a good stable vibration isolation effect.

The invention discloses an active and passive integrated four-feet converged type vibration isolator which comprises an upper connection plate (1), inclined micro-vibration control units (2), a thirdslotted disk spring (4), a lower connection plate (5) and a slotted cylindrical spring (6); one end of the slotted cylindrical spring (6) is connected with the third slotted disk spring (4); the otherend of the slotted cylindrical spring (6) is fixed to the middle part of the lower connection plate (5); the third slotted disk spring (4) is fixed to the middle part of the upper connection plate (1); the inclined micro-vibration control units (2) are uniformly distributed around a center shaft of the slotted cylindrical spring (6) in the circumferential direction of the upper connection plate (1), and are obliquely mounted; one ends of the inclined micro-vibration control units (2) are connected with the upper connection plate (1); and the other ends of the inclined micro-vibration controlunits (2) are connected with the lower connection plate (5). With the adoption of an active and passive integrated structure, wide frequency band micro-vibration control can be realized, the vibrationisolation efficiency of the vibration isolator and the adaptability of the vibration isolator to a complex environment and a changing object are improved.

The invention discloses a low-noise range hood, which comprises a volute, wherein an impeller is arranged inside the volute, a first annular air duct is arranged at the bottom of the volute, and a second annular air duct is arranged above the first annular air duct; a plurality of first partition plates are arranged in the first annular air duct, a spheroidal air bag is movably connected between the two adjacent first partition plates, a plurality of first through holes are evenly formed in the first partition plates, a second partition plate is arranged at the air inlet of the first annular air duct, a plurality of second through holes are evenly formed in the second partition plate, and a first air deflector is obliquely arranged between the second partition plate and the first partition plate adjacent to the second partition plate; a third partition plate is arranged at the air inlet of the second annular air duct, a third through hole is formed in the third partition plate and is communicated with an air inlet end of a cavity, and an air outlet end of the cavity is communicated with the second annular air duct. According to the low-noise range hood, the deficiencies of the prior art can be improved, and the efficient noise reduction at different air volumes can be realized.

The invention discloses a platform and a method of main and passive vibration isolation in space six-degree of freedom based on electromagnetic negative stiffness. The platform comprises a load platform, a foundation platform and six electromagnetic negative stiffness vibration isolators, wherein the six electromagnetic negative stiffness vibration isolators are fixed between the load platform andthe foundation platform through a connecting piece; the two adjacent vibration isolators are perpendicular to each other in the axial direction, and the load platform has six-degree of freedom relative to the foundation platform; each electromagnetic negative stiffness vibration isolator comprises an actuating rod, an upper shell, a lower shell, a combined disc spring, a base, a bottom supportingrod and two sets of excitation devices, wherein the actuating rod is fixedly connected with the upper shell through a cross beam spring piece, a strain sensor is pasted on the cross beam spring piece, and is used for detecting the axial displacement of the actuating rod; each vibration isolator can realize active control of equivalent electromagnetic negative rigidity, so that the vibration isolation platform is of a positive and negative stiffness parallel structure in six-degrees of freedom, the vibration isolators have relatively low resonance frequency and a very wide vibration isolationfrequency band, so that micro-vibrations in the space six-degree of freedom direction can be effectively inhibited. According to the platform and the method, the platform and the method of the main and passive vibration isolation in the space six-degree of freedom based on the electromagnetic negative stiffness are suitable for equipment micro-vibration main and passive vibration isolation in thefield of spaceflight aviation, precise instruments and the like.