48results about How to "Self-centering" patented technology

The invention discloses an ultra-precise static-pressure main shaft dynamic characteristic online testing method capable of eliminating a measuring basis installation error and relates to the field of static-pressure main shaft dynamic characteristic testing. The method solves the problems that an existing method cannot achieve ultra-precise static-pressure main shaft dynamic characteristic online testing or a measurement result can be seriously influenced by the installation precision of a measuring reference plane according to the existing method. According to the ultra-precise static-pressure main shaft dynamic characteristic online testing method capable of eliminating the measuring basis installation error, a cone-shaped installation reference plane is machined at the rear end of a direct-driven ultra-precise static-pressure main shaft rotator, a standard ball is directly installed on the cone-shaped reference plane to serve as a measuring basis, two high-precision displacement sensors are adopted to measure the displacement change between the standard ball and the two high-precision displacement sensors when the main shaft rotates, the measured displacement change values are converted into a digital signal through a sensor signal amplification and data collection system and the digital signal is sent to a computer for data analysis and data processing, and then the ultra-precise direct-driven static-pressure main shaft dynamic characteristic online testing is achieved. Due to the fact that two channels are adopted to carry out measurement at the same time, detection of the axial deviation of the main shaft and detection of the radial deflection of the main shaft are achieved at the same time.

A super-precision directly driving static pressure main shaft dynamic balance method relates to a static pressure main shaft dynamic balance method, which aims to solve the problem that the conventional method cannot realize the precise dynamic balance of a super-precision static pressure main shaft rotor. A conical mounting reference surface is processed at the rear end of the directly driving super-precision static pressure main shaft rotor; a standard ball is directly mounted on the conical reference surface and services as a measurement reference; the change of displacement of the standard ball and the high-precision displacement sensor is measured by adopting a high-precision displacement sensor when a main shaft is in rotation; the change is amplified into a 0-10 V signal via a sensor signal amplifier, which is input to a dynamic balancing instrument; information about the rotation speed of the main shaft, measured by a photoelectric velocimeter, is input into the dynamic balancing instrument; the measured information is processed by the dynamic balancing instrument to obtain the imbalance mass and the phase of the rotor; a required balancing weighting block is added on a dynamic balancing disc according to the indicated phase of the dynamic balancing instrument. The rotation center of the main shaft surely and well overlaps with the rotation center of a measurement reference ball, and influence of a mounting error on the measurement result is eliminated.

The invention provides an indexing and positioning mechanism for a turret tool holder, which includes a main shaft and a box body, and the box body is arranged around the main shaft. Set on the front end of the main shaft, the cutter head is installed on the movable toothed plate, the positioning plate is set on the box body, the locking toothed plate is set on the main shaft body and can move along the axial direction of the main shaft on the main shaft body, and the locking toothed plate passes through The conical teeth arranged at the front end mesh with the movable toothed plate, and the locking toothed plate is connected with the positioning plate through the guide positioning pin. The invention has reasonable structure and obvious effect.

The invention provides a notched bolt connection and separation mechanism driven by SMA. The mechanism adopts notched bolts as connecting fasteners and SMA tubes as separated driving elements; After passing through the SMA tube and the separation structure substrate, it is screwed to the fixed structure substrate, thereby connecting and compressing the SMA tube, the separation structure substrate and the fixed structure substrate; The notch bolts are stretched and deformed, and break due to stress concentration at the notch to achieve separation. The impact load after the bolt breaks is absorbed by the metal rubber pad; the heat insulation layer and silicone insulating sleeve outside the heating layer can reduce heat loss , so that the heating and deformation of the SMA tube is faster, and the separation time of the mechanism is shorter. The invention has large release load, complete unlocking, high reliability, and strong vibration and impact resistance.

The invention discloses a clamping device, which comprises a clamping main body. The clamping main body is provided with a clamping hole, and a workpiece that needs to be clamped is located in the clamping hole. It also includes a first slider, a second slider, and a connecting piece. The main body of the holding clamp is provided with a sliding hole, and when the connecting piece moves, the first slider and the second slider are simultaneously driven to approach in the sliding hole, so as to hold the workpiece tightly. In the present invention, through the design of the first slider and the second slider with opposite threads, the movement of the stud can make the first slider and the second slider move toward each other or move backwards at the same time, making it more convenient to hold or disassemble; The design of the arc surface makes the clamping device self-centering. The invention also discloses a clamping method.

A wiper device for wiping, in particular a movable windshield (2) on a motor vehicle, equipped with: a rotatably driven first clutch part (10) for connection to a fixed motor-gear transmission The driving shaft (9) that can be driven by rotation at the back of the unit (6); a second clutch part (15), which is connected with a wiper shaft (14) for driving a wiper (5), and can be used together with the gear The windshield (2) moves together and can engage with the first clutch part (10) in such a way as to transmit torque and center the wiper shaft (14) against the drive shaft (9); an anti-overload protection device, For limiting the torque that can be transmitted between the first clutch part (10) and the second clutch part (15), the protection device is integrally formed with the first clutch part (10) and / or the second clutch part (15) of.