39results about How to "High motion positioning accuracy" patented technology

The winding mechanism for weaving hard ultra thick fabric includes a pedestal, a fabric holding device with a shed stabilizing unit, a guide rail, a motor connected to a controller with preset weaving program, a lead screw connected to the motor, and a set of fasteners arranged homogeneously on the cross beam on the fabric holding device and connected to the controller to regulate the pressure of the fabric holding board. The present invention has stable and reliable structure, automatic weaving process, high weaving continuity, high weaving efficiency and other advantages.

The invention relates to a control method and system for accurate positioning of the linear movement of a translational turnout. The control method comprises the steps that firstly, target values of pulse count among all turning positions of the turnout are determined, and actual measurement is conducted through operation of the turnout; under the situation that the turnout is unlocked in place, a motor is controlled to be in a zero-speed high-torque output state by a frequency converter; a brake is opened by a PLC; the driving direction of the motor and the target value of pulse count are determined by the PLC; the pulse count value in the turning process is read in by the PLC; the pulse count value and the target value of the pulse count are compared through the PLC, and parameters are determined and transmitted to the frequency converter; the motor is controlled to rotate by the frequency converter, and a turnout beam is made to conduct linear movement along a track through a transmission mechanism. The control system comprises the PLC, the frequency converter, the motor, a pulse distributor and the transmission mechanism. By means of the control method, the requirement for the positioning detection of the linear movement of the translational turnout can be met; by means of the control system, the positioning accuracy in the turning process of the turnout can be improved, and the impact to the transmission mechanism when the turnout is started and stopped at large inertia can be reduced.

The invention provides a multi-stack piezoelectric actuator independent time-sharing driving device and method and relates to the application in the field of a precision displacement platform. Each layer of piezoelectric actuators is independently driven. A driving signal is separated into sub signals in time series connection according to a voltage evenly-spaced rule. A signal applied to an independent piezoelectric actuator of each layer is an amplified sub signal. The voltage evenly-spaced rule is achieved by a signal separating circuit. The driving signal may be any desired signal. Compared with the piezoelectric stack with the parallel connection of multiple layers of piezoelectric actuators, according to the driving device of the invention, the hysteresis accumulation due to paralleldriving can be effectively eliminated, only the hysteresis of a piezoelectric actuator of one layer exists at the same moment, the hysteresis in the displacement process of the multiple layers of piezoelectric actuators is effectively reduced, the motion positioning accuracy is improved, the operation is simple, and the cost is low.

The invention provides an active driving wire cable table of a silicon wafer stage of a lithography machine. The active driving wire cable table comprises a Y-direction sliding table, a Y-direction guide rail and a cross-telescopic linkage mechanism, wherein the Y-direction sliding table is disposed on the Y-direction guide rail through an air bearing; the Y-direction sliding table is driven by a sliding table motor and moves synchronously in the Y direction and on the silicon wafer stage; wire cable instrument is conveyed to the silicon wafer stage along the cross-telescopic linkage mechanism through the Y-direction sliding table; the cross-telescopic linkage mechanism comprises a cross telescopic connecting rod and a driver; one end of the cross telescopic connecting rod is connected with the Y-direction sliding table; the other end of the cross telescopic connecting rod is connected with the silicon wafer stage through the wire cable instrument; and the driver is used for driving the cross telescopic connecting rod to move along with an X direction, so that the wire cable is driven to move along the X direction. The active driving wire cable table of the silicon wafer stage of the lithography machine can realize active control of the wire cable table and follow motion of the wire cable table to the silicon wafer stage in an X-Y plane.

The invention discloses a high pressure constant-flow solvent delivery pump for a liquid chromatograph. The high pressure solvent delivery pump comprises a primary pump ball screw, a secondary pump ball screw, a primary piston, a secondary piston, a primary plunger rod, a secondary plunger rod, a primary pump head and a secondary pump head. One end of the primary pump ball screw and one end of the secondary pump ball screw are in linkage through a gear. A nut of the primary pump ball screw is arranged inside the primary piston and is fixedly connected with the primary piston. A nut of the secondary pump ball screw is arranged in the secondary piston and is fixedly connected with the secondary piston. The primary piston and the primary plunger rod are connected, and the secondary piston and the secondary plunger rod are connected. One end of the primary plunger rod penetrates through the bottom of the primary pump head and is inserted into a plunger cavity; one end of the secondary plunger rod penetrates through the bottom of the secondary pump head and is inserted into a plunger cavity. The primary plunger rod and the secondary plunger rod move in the opposite directions. The output port of the primary pump head is communicated with the inlet of an input one-way valve of the secondary pump head. The invention further provides a minitype high pressure solvent delivery pump system. The microcomputer all-digital control is adopted, the movement positioning precision is high, controllability is high, flexibility is high, the size is small, and the flow change range is wide.

The invention discloses a control method of a multi-section peristaltic snake-like robot running in a nuclear fusion cabin. The control method is characterized in that a front section side positioning module and a rear section side positioning module are symmetrically arranged at two ends of a middle section axial moving module to form a walking mechanism, the walking mechanism is used as at least two creeping units, the at least two creeping units are serially connected to form the multi-section peristaltic snake-like robot, and adjacent creeping units are connected by using two telescopic elastic universal joints. By using the control method disclosed by the invention, a locomotion gait similar to multi-section worm walking can be realized, the running stability is good, the control is simple; a movement locus can be across a large dual-ring groove at the bottom of the whole nuclear fusion cabin, and the all-dimensional vision information acquisition of a space inside the nuclear fusion cabin is realized by carrying a vision observing cloud deck.

A mold moving and jacking-out system of a large injection mold comprises a support, a horizontal mold moving mechanism, a lifting mechanism and a jacking-out mechanism, wherein the horizontal mold moving mechanism is located over the jacking-out mechanism and supported through the lifting mechanism; the horizontal mold moving mechanism comprises two horizontal moving guide platforms, a mold pulling plate, a mold fixing sliding plate and a driving assembly; the mold pulling plate is connected with the mold fixing sliding plate in a matched mode in the horizontal direction through a pulling hookto drive the mold fixing sliding plate to move in the horizontal direction; the mold is fixed to the mold fixing sliding plate and moves into or out of an injection molding main machine along with movement of the mold fixing sliding plate; the upper end of the lifting mechanism is fixed to the bottom surface of one of the horizontal moving guide platforms to drive the horizontal mold moving mechanism to ascend and descend, and the mold fixing sliding plate and the jacking-out mechanism are made to get close to or away from each other. The mold moving and jacking-out system of the large injection mold can meet the moving and jacking-out requirements of the large injection mold, realize intermittent work of the large injection molding machine, and improve the production efficiency and automation level of the large injection molding machine. The invention further provides an intermittent production method of the large injection molding machine.

A photoetching machine workpiece stage magnetic preloading balance positioning system belongs to the field of semiconductor photoetching technology; the system mainly comprises a base stage, a balance mass system, a magnetic preloading system, a motion unit, a silicon wafer stage, and a balance mass drift-resistant system; the balance mass system comprises two frames which nest each other, and has freedom degrees in the X and Y directions; the motion unit is disposed at the upper part; the impact force caused by the motion part to the base stage is weakened by momentum conservation principle; the balance mass drift-resistant system is used to compensate the position displacement of the balance mass system caused by external resistance during working; the magnetic preloading system is used for real-time compensation of the torsion of the workpiece stage along a Z axis; the invention can effectively reduce internal vibration, compensate the torsion of the workpiece stage along the Z axis, and thus greatly improve the motion positioning precision of the silicon wafer stage.

The invention discloses a visual observation mechanism working in a nuclear fusion chamber and a control method thereof. The visual observation mechanism is characterized in that a front body segment lateral positioning module and a rear body segment lateral positioning module are symmetrically arranged at two ends of a middle body segment axial motion module to form a traveling mechanism; a visual observation cloud deck is arranged at the front part of the front body segment lateral positioning module; the front body segment lateral positioning module and the middle body segment axial motion module are connected by a front double universal joint; the rear body segment lateral positioning module and the middle body segment axial motion module are connected by a rear double universal joint. According to the visual observation mechanism disclosed by the invention, the traveling mechanism is wide in motion range; the traveling track of the traveling mechanism can extend all over the complete cycle of a large-double circular channel at the bottom of the nuclear fusion chamber; the visual observation cloud deck is arranged in a matching way, so that all-round visual information acquisition of an annular space with a D-shaped section inside the nuclear fusion chamber can be finished.