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 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 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.