7results about How to "Reduce chattering" patented technology

A self-adaptive wind-resistant and vibration-suppressing shutter unit capable of constraining all shutters belongs to the technical field of ventilation and air conditioning and comprises a shutter unit, a driving assembly and a self-adaptive wind-resistant and vibration-suppressing device. Each shutter unit comprises a window frame and M shutters, and M is larger than or equal to 3; the shutters are hinged to the window frame through rotating shafts arranged at the upper and lower ends of the shutters; the driving assembly is connected with M shutters of the shutter unit; the self-adaptive wind-resistant vibration suppression device is a self-adaptive flexible adsorption belt and is arranged on the windward side of the shutter unit. The two ends of the self-adaptive flexible adsorption belt are fixedly connected to the leftmost shutter and the rightmost shutter of the shutter unit respectively to form flexible constraint, and the middle part of the self-adaptive flexible adsorption belt is adsorbed to the middle shutter in a self-adaptive mode through the windward side air inlet pressure effect to form single-side contact constraint; shutters at the adjacent ends of the left and right adjacent louver units are hinged through rigid connecting rods, and two-force component constraint is formed. Effective cooperative constraint of all the shutters is comprehensively achieved, and then the wind resistance and vibration suppression effects of the shutters are improved.

The invention relates to the technical field of asphalt processing, in particular to a drying cylinder material lifting blade anti-abrasion mechanism and a using method. Comprising a drying cylinder body, a plurality of material lifting blade bodies fixedly connected to the inner wall of the drying cylinder body, a plurality of guide plates fixedly connected to the inner wall of the drying cylinder body and self-cleaning units fixedly installed on the material lifting blade bodies. Scraping asphalt which is not completely dried and adhered to the outer wall of the material lifting blade main body; when the multiple chains swing, the knocking balls at the ends of the chains can synchronously move along with swing of the chains, the knocking balls intermittently collide with the outer wall of the material lifting blade body when moving, the completely dried and adhered asphalt on the material lifting blade body can be broken and fall off through collision, and self-cleaning operation on the surface of the material lifting blade body is completed.

The utility model discloses a honing head with multiple oilstone protection wings, and particularly relates to the technical field of honing heads, the honing head comprises a honing head body, oilstones are installed on the outer side of the honing head body, the two sides of the oilstones are fixedly connected with the protection wings, and a disassembly and assembly mechanism is arranged between the honing head body and the oilstones; the dismounting and mounting mechanism comprises a mounting connecting plate, the mounting connecting plate is fixed to one side of the oilstone, and a threaded groove is formed in the surface of the top of the mounting connecting plate. According to the utility model, through the arrangement of the dismounting and mounting mechanism, the oilstone is quickly mounted and replaced, the oilstone is fixed on the honing head, the maintenance time and cost are obviously reduced, the protective wings are made of polyurethane materials and fixed on the two sides of the oilstone, the oilstone can be effectively prevented from being externally impacted or abraded in the machining process, and meanwhile, the service life of the oilstone is prolonged. The flexible materials of the protective wings can absorb vibration generated in the machining process, the machining stability is improved, vibration marks and defects on the surface of the workpiece are reduced, and the machining quality is remarkably improved.

The invention belongs to the technical field of heavy machine tool machining, and particularly relates to a positioning mechanism for machining a spindle of a heavy horizontal machine tool and a machining method. Comprising a movable seat, the movable seat is located between a clamp assembly and a tailstock, the movable seat and the tailstock are both connected to two sliding rails in a sliding mode, the sliding rails and the bottom of the clamp assembly are both fixedly connected to a bottom plate, and a steel billet to be machined is arranged between the clamp assembly and the tailstock in a hoisting mode and located on the movable seat. According to the method, strip-shaped cuttings generated in the turning process can be reduced, the operation safety is improved, and the situation that the cuttings scratch the machined surface is avoided; built-up edges can be reduced, and the surface smoothness of a machined workpiece is guaranteed; eccentric rotation of the workpiece in the machining process can be reduced, and the surface roughness of the workpiece is reduced; and in the turning process, the turning speed is adjusted in real time along with the change of the shape and the quality of the machined steel blank so as to achieve the optimal turning rotating speed.

This invention provides a device and method for machining internal threads of a tee pipe fitting, relating to the technical field of internal thread machining equipment. The invention includes a bottom support frame, with a fixing plate mounted on the upper end of the bottom support frame. A first mounting seat is fixedly mounted on the upper end of the fixing plate, and a second mounting seat, adjustable horizontally in the XY axis direction by a servo motor, is provided on the upper end of the fixing plate. A milling cutter is mounted on the second mounting seat. A limiting part is rotatably mounted on the side of the first mounting seat near the second mounting seat, wherein the limiting part can clamp and fix the tee to be machined. This invention adopts a double clamping and positioning structure of inner support and outer clamping. The inner support expands outward from the inside of the workpiece port to form an inner wall support, and the radial clamping arm, in conjunction with the clamping strip, clamps synchronously from the outer wall, ensuring that the tee to be machined and the turntable remain precisely coaxial, avoiding radial movement and eccentric rotation of the workpiece during machining.

The invention provides a novel safety control method for a magnetic suspension system based on a control barrier function, and the method comprises the following steps: obtaining the real-time state information of the magnetic suspension system, and constructing a mathematical model of the magnetic suspension system; calculating a tracking error, and recursively constructing a non-singular terminal sliding mode surface; designing an adaptive finite time disturbance observer, and performing finite time estimation on lumped disturbance including unmodeled dynamics and external disturbance to obtain a disturbance estimation value; designing a continuous nonsingular terminal sliding mode composite controller as a nominal control law; constructing a control screen barrier function according to a preset output security constraint boundary of the magnetic suspension system; and constructing a quadratic programming problem by taking the nominal control law as an expected input and the control barrier function as a safety constraint, and carrying out online solving to obtain a final safety control input. According to the invention, rapid and high-precision position tracking control can be realized on the premise of strictly guaranteeing that the system output is always in the preset safety interval.

The present application relates to a kind of rolling mill vibration detection systems, it includes vibration real-time monitoring module, vibration analysis and alarm module and roller bearing fault diagnosis module;The vibration real-time monitoring module is used to collect the vibration acceleration of roller and rolling speed;The vibration analysis and alarm module is used for vibration intensity judgment and vibration frequency range judgment;The roller bearing fault diagnosis module identifies fault position and fault type and exports;The present application detects and feeds back the vertical vibration situation of rolling mill in real time, especially for common three times frequency chatter;Through reasonable measuring point selection and acquisition mode, and set vibration intensity and vibration frequency range two-stage alarm mechanism, avoid due to abnormal vibration bring the damage of equipment itself and cause safety production problem, to improve strip yield, optimize strip surface quality and dimensional accuracy, reduce the vibration mark of strip due to vibration.