866results about How to "Frictionless" patented technology

This invention relates to an electromagnetic progressive shaping method for plate moving coils and a device, in which, said device includes a computer control system, an electromagnetic force generation system and a three-shaft digital control shaping system including a plate clamping elevating device, a supporting model frame and an electromagnetic shaping clamping rod, in which, the computer controls the coil to move downward along the contour of a model profile from the top according to the contour data of the model profile and the plate is formed partly relying on the magnetic force of coil till to the bottom of the model and finish the entire process.

The invention discloses a flexible micro-positioning stage with two degrees of freedom, the design of the flexible micro-positioning stage with two degrees of freedom comprises a flexible mechanism and an integral structure, two piezoelectric ceramic drivers are adopted in the structure, the tail part of each driver is connected with a base through a bolt, and the top end of each driver is connected with a spherical joint through a thread, thereby realizing Hertz contact. The flexible mechanism of the positioning stage mainly comprises three parts of the base, flexible branched chains with entirely consistent structures and a supporting movable platform thereof. Two displacement sensors are used for measuring actual output of the movable platform and respectively fixed between the base and the movable platform through an L-shaped support and a Z-shaped support. The flexible micro-positioning stage is characterized by high resolution and fast dynamic response speed, and can be taken as an auxiliary positioning platform of a nano-imprint lithography positioning system for realizing micro-feeding and precise positioning.

The invention provides a six-degree-of-freedom quasi-zero-rigidity vibration isolation system based on a Stewart platform. The system comprises an upper platform, a lower platform and six same landing legs fixed between the upper platform and the lower platform through hinge blocks. The three hinge blocks are distributed in an equilateral triangle mode, two corresponding landing legs are fixed to each hinge block, the adjacent landing legs are perpendicular, and the upper platform has six degrees of freedom relative to the lower platform. The six landing legs have the quasi-zero-rigidity characteristic, so that the vibration isolation system has the quasi-zero-rigidity characteristic on the six degrees of freedom, the all-order resonant frequency of the vibration isolation system is small, and the wide vibration isolation frequency range is achieved. The system has the advantages of being high in bearing capacity and low in resonant frequency, has the good restraint effect on low-frequency vibration, and is suitable for vibration isolation of flywheel systems and optical cameras in the spaceflight field and vibration isolation of equipment such as precision machine tools and precision measuring systems in the civil field.

A precise positioning platform consists of output platform, base, three gentle and agreeable mechanisms, three piezoelectric drivers, three positioning devices, three displacement sensors and controllers. It is featured as arranging mechanism and sensors in 120 degree angle towards outside along output platform to ensure precision, stability and linearity of movement and to provide translation in X and Y direction as well as rotation in Z direction, using drivers to ensure quick response speed for achieving nanoresolution and subnauoprecision of positioning.

The invention discloses a two-degree of freedom precise positioning work table, which comprises a base, a moving platform, a rigid support which is connected with the bottom of the base, and four flexible branched chains which are connected between the moving platform and the base, wherein each flexible branched chain comprises a moving block and three groups of flexible plate spring structures; each flexible plate spring structure consists of two '-'-shaped flexible plate springs; a first group and a second group of the flexible plate spring structures are respectively positioned at the left side and the right side of the moving block; the lower ends of the two '-'-shaped flexible plate springs of a third group of the flexible plate spring structures are connected with the side wall of the upper end of the moving block, and the upper ends thereof are connected with the side wall of the moving platform; four piezoelectric ceramics driving devices are respectively horizontally arranged; a ball-shaped joint of each driving device is supported on the side wall of the lower end of the moving block; and conducting strips of two position sensors are respectively connected with the upper plane of the rigid support and the lower plane of the moving platform. The positioning work table can be taken as an auxiliary positioning platform of a nanometer embossing photoetching positioning system to realize the microscale feeding and the precise positioning.

The invention discloses a spatial three-dimensional micro-displacement precise positioning device which comprises a fixed base and a moving table, wherein the moving table is connected with the fixed base through three connecting mechanisms having a displacement amplifying function and other two connecting mechanisms arranged oppositely respectively; the other two connecting mechanisms play the effect of displacement decoupling and enhance the rigidity of a platform; the connecting mechanisms having the displacement amplifying function amplify piezoelectric ceramic output displacement by a piezoelectric ceramic driver and a secondary cascaded lever amplification mechanism which is arranged symmetrically, so that the working stroke of the positioning device is enlarged and the displacement decoupling function can be realized.

The present invention provides a workpiece three-dimensional dimensions automatic detection system and method based on laser scanning. The system comprises a three-dimensional moving platform, a three-dimensional moving platform numerical control module, a laser scanning sensor, a laser scanning sensor numerical control module, a laser scanning sensor rotating mechanism, a power module and detection software, and belongs to the technical field of three-dimensional scanning and digital analysis. According to the system, the numerical control three-dimensional moving platform is used, so that total dynamic measurement is implemented, manual movement detection is replaced, and detection efficiency is improved; a pneumatic floating slideway is used, so that movement precision is improved; thelaser scanning sensor rotating mechanism is assembled on a Z-axis pneumatic floating slideway, so that deflexion of the laser scanning sensor can be implemented, and a workpiece is scanned from different angles; and a blue line sweeping laser scanning sensor is selected, so that anti-interference is strong, and measurement precision is high.

The invention discloses an installation structure of a train roof jumper cable of the urban rail. A first high-voltage connector casing, a first high/low voltage connector, a second high/low voltage connector and a first low-voltage connector casing are positioned in the top of a first compartment; a second high-voltage connector casing, a third high/low voltage connector, a fourth high/low voltage connector and a second low-voltage connector casing are positioned in the top of a second compartment; the first high/low voltage connector on the first high-voltage connector casing is connected to the third high/low voltage connector on the second high-voltage connector casing via the jumper cable; and the second high/low voltage connector on the first low-voltage connector casing is connected with the fourth high/low voltage connector on the second low-voltage connector casing via the jumper cable. The installation structure has the advantages that the operation space is large, the installation environment is simple, and the structure is safer and more reliable; the service life is longer; the cable path is shorter, and the cost is reduced greatly; the sealing performance is higher; the whole installation structure can be dismounted rapidly, the occupation space is small, and the structure is beautiful and tidy; and it is not required to reconstruct end wall and channel structures, the workload is low, and the cost is lower.

The invention relates to an active maglev electromagnetic catapult for aircraft carriers. The active maglev electromagnetic catapult comprises a maglev guide rail fixed on a catapult base, a catapult platform sleeved on the guide rail, and a linear motor. The shipboard aircraft catapult platform is supported by active maglev supporting technology and is driven by the high-power linear catapult motor, and catapult-assisted take-off of shipboard aircrafts is achieved. The active maglev supporting technology is introduced, a catapult platform position control system and a speed control system are provided, and accordingly positioning precision and catapulting speed of the catapult platform are increased greatly, electrification is achieved and the service life is prolonged. The active maglev electromagnetic catapult has the advantages of adjustable supporting rigidity and damping, no friction, no need of lubrication, no environment pollution and the like.

The invention discloses a two-freedom-degree, large-travel and large-load micro-positioning platform which comprises an upper platform and a lower platform. The lower platform is provided with a base. The upper platform comprises a central movable platform. The movable platform is connected with the base through four flexible standing columns. The four flexible standing columns are distributed at four corners below the movable platform. Each flexible standing column is formed by serially connecting two flexible hook hinges. Each flexible hook hinge is formed by two coplanar circular flexible hinges in a penetration manner. Each of two adjacent movable blocks of four movable blocks is driven by a voice coil motor to move in a translation manner. The two-freedom-degree, large-travel and large-load micro-positioning platform has the advantages that the voice coil motors are used as drivers, and large-travel motion range and submicron-level resolution are provided; the movable platform and the base are connected through the flexible standing columns, and the radial rigidity of the positioning platform is quite large.

The invention discloses a double-reed large-turning angle flexible joint, relates to the technical field of mechanical kinematic pairs, and solves the problem that the conventional flexible hinge is small in motion range. The double-reed large-turning angle flexible joint is characterized in that a first shell is integrally formed by a 210-degree arc plate and a 90-degree arc plate; the side wall of the 210-degree arc plate and the side wall of the 90-degree arc plate are integrally connected, and the thickness of the 90-degree arc plate is smaller than that of the 210-degree arc plate; the 210-degree arc plate of the first shell is arranged outside a 90-degree arc plate of a second shell, the 90-degree arc plate of the first shell is arranged inside a 210-degree arc plate of the second shell, and a gap is formed between the first shell and the second shell; a first flexible plate is inserted into the first shell and the second shell through a first through groove and a second through groove; a second flexible plate is inserted into the first shell and the second shell through the remaining parts of the first through groove and the second through groove. The double-reed large-turning angle flexible joint is applied to the field of large-stroke precision transmission mechanisms and flexible transmission.

The invention relates to a long-distance air-flotation linear guide rail unaffected by air pipe disturbance, comprises an air flotation shaft and at least two air flotation sleeves, wherein the air flotation sleeves are sleeved on the air flotation shaft and are both connected with an air storage sleeve in a sealing way; the air storage sleeve is connected with a guide bearing member which is in follow-up with a moving member; the long-distance air-flotation linear guide rail also comprises a long-distance linear guide rail which is used for providing support and guidance for long-distance motion, wherein a sliding block can be slidably arranged on the long-distance linear guide rail and fixedly connected with the air flotation shaft; an air storage cavity is arranged between the air storage sleeve and the air flotation shaft; and the shaft center of the air flotation shaft is provided with an air inlet channel which is connected with a compressed air inlet pipe and communicated with the air storage cavity; and the air storage cavity is provided with an air outlet which is communicated with air outlets of all air flotation sleeves through air pipes. The invention can effectively realize long distance, eliminate the influence of resistance generated by the motion of the sliding block due to bending of air pipes and is high in reliability and convenient to install, use and maintain.

The invention provides a flexible back supporting device for a large-caliber reflector. The supporting device comprises the large-caliber reflector, a lens back plate, a supporting plate, a joint plate, a screw, flexible branch hinges, sliding flexible hinge supports, a flexible hinge connecting rod and a driving system. The three flexible branch hinges and the joint plate together form a combined hinge to constrain three degrees of horizontal moving freedom of the large-caliber reflector, the pitching and deflecting movements of the large-caliber reflector are achieved through flexible hinge blocks of the sliding flexible hinge supports and the driving system, when the driving system is tightly locked, the two degrees of rotating freedom of the large-caliber reflector are constrained, and the degree of the plane inner rotating freedom of the large-caliber reflector is constrained through the flexible hinge connecting rod. The flexible hinge structure is adopted as the supporting and positioning mechanism of the large-caliber reflector, nanoscale positioning precision is achieved, and the structural stability and the precision stability are ensured through matched design of the flexibility and the moving precision of the large-caliber reflector. The flexible back supporting device has the advantages of being simple in structure, stable in movement, free of friction or gaps, needless for lubrication and high in moving sensitivity.