69 results about "Precision engineering" patented technology

The invention relates to a method for calibration of 2-axis high precision digital angle measurement device, particularly for initializing a planar angle measuring device and an apparatus to generate simultaneous two-dimensional resultant planar angles of full 360° rotation. The planar angle measurement device is, typically but not exclusively, used in concurrent two-dimensional angles leveling, setting and alignment tasks for precision machine setup in the fields of precision engineering and metrology applications.

The invention discloses an inchworm-type precise linear micro-actuator based on a complaint mechanism. The inchworm-type precise linear micro-actuator comprises driving mechanisms, two clamping mechanisms and stators, wherein each driving mechanism consists of four symmetrically arranged driving branch chains and one pair of stators, each driving branch chain consists of two lever structures, the driving branch chains are connected to the stators by adopting flexible hinges, and reciprocating micromovement can be performed relative to the stators; each clamping mechanism consists of three pairs of flexible hinges, one pair of levers and one pair of clamping pieces which are symmetrically arranged, and the two clamping mechanisms are symmetrically connected to two ends of each driving mechanism through the levers; the stators are of long and thin cylinder-shaped structures, are arranged at the symmetrical center of the micro-actuator, are matched with the clamping mechanisms through holes, are matched with the driving mechanisms through through grooves, and can move in the holes and the through grooves. The clamping mechanisms are driven by the driving mechanisms to carry out reciprocating motion, and the stators are driven by the clamping mechanisms to perform a bionic inchworm motion law in the motion manner of linear motion. The disclosed micro-actuator can be used in the fields of ultra-precision machining, precision engineering, micro electro mechanical systems, bioengineering, semiconductor manufacturing and the like.

An electronic level consists of a capacitive sensor and a measurement processor circuit. A sensor measuring circuit, an A/D conversion circuit, CPU and a LCD display are connected in series in the measurement processor circuit. A capacitance/frequency conversion circuit, the CPU and the LCD display are connected in series. The invention possesses the features as follows. (1) Capacitance is used as the sensor for measuring level, providing the high measuring accuracy with simple structure. (2) The measurement processor circuit with simple structure of the circuit is adopted, providing high sensitivity with cheap component. (3) The entire structure is simple so that the products are easy to be manufactured. The electronic level can be utilized in large-scale or precise engineering.

The invention relates to a bi-piezoelectric stack driving type precision rotary driving device, and belongs to the technical field of precision engineering. The bi-piezoelectric stack driving type precision rotary driving device comprises a support base, a rotary table, a stator assembly, a bearing and the like; the support base and the rotary table are connected through the bearing in a matched manner; the support base and the stator assembly are connected through a bolt; the rotary table and the stator assembly are contacted and matched through the front end of a driving foot; and the bearing, the support base and the rotary table are in interference fit. When an exciting electric signal acts on a stack type piezoelectric component, the stack type piezoelectric component performs axial elongation based on the inverse piezoelectric effect; therefore, the driving foot performs tangential displacement, so that the rotary table is driven to perform rotational motion; and the direction and the time sequence of driving voltage are changed, so that the rotary table can be controlled to perform forward rotation, inverse rotation and positioning stillness. The bi-piezoelectric stack driving type precision rotary driving device disclosed by the invention has the technical advantages of being simple in structure, high in positioning precision, large in stroke, rapid in response speed and the like, and has wide application prospect in the technical field of precision engineering.

The invention discloses a high-stability PA66 modified material and a preparation method thereof. The modified material consists of the following components in percentage by weight: 65-76 percent of PA66 resin, 10-15 percent of PA6 resin, 2 percent of anti-wear agent, 1.5 percent of composite lubricating agent, 0.3 percent of antioxidant, 10-15 percent of wollastonite in powder, 0.1 percent of talc powder and 0.3 percent of coupling agent. The invention further provides a preparation method of the modified material. By blending the anti-wear agent and the wollastonite in powder and modifying PA66, the prepared nylon material has high mechanical property and high wear resistance, the defect of easy moisture absorption of nylon is overcome, and the size is stable. The high-stability PA66 modified material can be widely applied to the fields of gears, bearings, fan blades, bicycle parts, automobile industry parts, electronics and electrics, precision engineering products, mechanical treatment, sports apparatuses and the like.

The invention relates to a piezoelectric-electromagnetic hybrid driving multi-degree-of-freedom precision positioning device and a control method, and belongs to the field of precision machinery and precision engineering. A piezoelectric inertial rotary positioning assembly is fixedly mounted in a connecting sleeve and ensures a clearance fit with an output shaft in the case of power outage. A piezoelectric bimorph rotary positioning assembly is installed in an interference fit with the output shaft. The output shaft is supported and guided by bearings I and II fixedly mounted in the connecting sleeve to ensure that the axis of a connecting assembly at the tail end of the output shaft is coaxial with an output axis. A clamping mechanism is fixedly connected to the flange of a body by a connecting bolt, is in close contact with the connecting sleeve by using a hemispherical contact member to realize self-locking, and is fixed to an external macro-adjustment positioning platform throughthe end portion of the body. The piezoelectric-electromagnetic hybrid driving multi-degree-of-freedom precision positioning device has compact structure, can achieve axial large-stroke linear positioning and macro-micro hybrid rotational positioning, can realize multi-degree-of-freedom motion output, and has good application prospects in the fields of precision optics, micromanipulation, aerospaceand precision instruments.

The invention relates to a piezoelectrically-driven precision rotation driving device using a specially-shaped hinge transmission mechanism, and belongs to the technical field of precision engineering. The piezoelectrically-driven precision rotation driving device using the specially-shaped hinge transmission mechanism comprises a base, a rotating table surface, a stator assembly, a bearing and other units, wherein the base and the rotating table surface are connected through the bearing; the base and the stator assembly are connected through bolts; the rotating table surface and the stator assembly are in contact fit through front ends of driving feet; the base and the rotating table surface are in interference fit with the bearing. When an excitation electric signal acts on a piezoelectric stack, the piezoelectric stack generates axial elongation based on an inverse piezoelectric effect, the driving feet generate tangential displacement to drive the rotating table surface to generateprecise rotating motion, and by changing the direction and the time sequence of driving voltage, the rotating table surface can be controlled to generate positive and reverse rotating motions and positioning can be achieved. The piezoelectrically-driven precision rotation driving device using the specially-shaped hinge transmission mechanism has many technical advantages such as simple structure, high positioning precision and high response speed, and has a wide application prospect in the technical field of precision engineering.

The invention relates to the technical field of precision engineering surveying, and provides a regressive reflective ball length standard rod length measuring device and a measuring method thereof. The regressive reflective ball length standard rod length measuring device comprises an optical sighting device, a calibration device, a directed sliding device and a distance measuring device; the optical sighting device is used for aiming optical centers of the regressive reflective balls at the two ends of the regressive reflective ball length standard rod; the calibration device is mounted on the directed sliding device, and a pre-calibrated regressive reflective ball length standard rod is placed on the calibration device; and the distance measuring device is used for detecting a sliding distance of the directed sliding device. The invention has the advantages of simple structure and convenient operation; and accurate measurement of the optical center spacing of the regressive reflective balls at both ends of the regressive reflective ball length standard rod is realized through using an indirect ranging method.

The invention relates to a production method of a surveying control point mark stake, and discloses the production method of the force centering observation mark stake for precision engineering surveying. The method comprises the following steps: a stake hole is manually dug to a bedrock part; a steel reinforcement cage is hung in the stake hole, so that the bottom of the steel reinforcement cage is placed on the bedrock, and the a design height above the ground of the steel reinforcement cage is reserved; concrete is poured in the stake hole; after concrete below the ground is solidified, concrete is poured in a reserved steel reinforcement cage formwork above the ground; a forced centering bolt is embedded at a center position of the top of an overground part of the concrete stake, and the diameter of the bolt is matched with a bolt aperture at the bottom of a measuring instrument pedestal; a forced centering disc is embedded at the top of the overground part of the concrete stake, and the center of the disc passes through the forced centering bolt. Settlement and deviation are effectively avoided, damage is not easy, usage is convenient, observation errors are reduced, and observation precision is improved; during usage, a measuring instrument is directly screwed and connected to the forced centering bolt and leveled, interference factors are reduced and centering errors are reduced.

The invention relates to the technical field of precision engineering measurement and provides a length measuring device for a pyramid prism length standard rod and a measuring method of the length measuring device. The length measuring device comprises a base, an optical sighting device, a calibration device, a directional sliding device and a distance measurement device, wherein the directionalsliding device is glidingly mounted on the base; the calibration device is mounted on the directional sliding device, and the pre-calibrated pyramid prism length standard rod is placed on the calibration device; the optical sighting device is mounted on the base and is oppositely arranged on one side of the directional sliding device; and the distance measurement device is used for detecting the sliding distance of the directional sliding device. The device is simple in structure and convenient to operate, and realizes accurate measurement of the distance between optical centers of pyramid prisms at two ends of the pyramid prism length standard rod.

The present invention discloses a pressure intensity value determination method and system. The method comprises: (1) collecting the digital value D and the environment temperature T outputted by a digital circuit about the pressure intensity sensor including an amplification circuit and an analog-digital conversion circuit; (2) obtaining a calibration temperature, a calibration digital value and the corresponding calibration pressure intensity value calibrated in advance; and (3) performing temperature compensation according to the digital value D and the environment temperature T to obtain a determined pressure intensity value. The system comprises a determination parameter collection module, a fixed point register module and a compensation calculation module. The pressure intensity value determination method and system perform compensation calculation according to the relation between the digital value D outputted by the pressure intensity sensor according to the environment temperature and the actual pressure intensity value, and the obtained pressure intensity value error is controlled in the limitation of 1% through determination, the high-precision engineering measurement requirement can be satisfied, and the pressure intensity value determination method and system have wide application prospects and important application values in the aspects of the altitude calculation and the indoor navigation.

The invention discloses a low-magnetism cement and a preparation method thereof, and belongs to the technical field of cement. The cement comprises a low-magnetism cement clinker and gypsum, wherein the low-magnetism cement clinker comprises the following mineral components: 25-45% of C3S, 40-50% of C2S, 10-15% of C4AF, and 0.1-5% of C3A; the litre weight of the low-magnetism cement clinker is 1300-1500g/L; the magnetic field strength of the low-magnetism cement after magnetizing is less than 20nT. According to the low-magnetism cement, the blank of low-magnetism cement in the industry is filled; the low-magnetism cement is provided; the cement indexes are controlled, and the materials are strictly selected, so that the magnetism is controlled to be within 20nT range; the low-magnetism cement is widely applied to mass engineering construction, such as ocean engineering, national defense construction and precision engineering, and is of great significance.

The invention, which belongs to the technical field of precision engineering measurement, relates to a three-dimensional precision control network measurement method. According to the method, three continuous adjacent wire points in a wire are used as a group of measurement objects; thee total stations are used for measuring each group of measurement objects in the wire; corresponding measurementdata of the next group of measurement objects are compared with measurement data of the previous group of same measurement objects; if the comparison result does not meet a set range, measurement is started again immediately by starting with a first group of measurement objects; and otherwise, measurement of the next group of measurement objects is carried out until all measurement points are measured completely. According to the measurement method provided by the invention, whether the measurement data are accurate or not can be compared in real time in the measurement process; and when the error of the measurement data of a certain group of measurement objects is large, measurement is started again directly from the first group of measurement points. The labor intensity of workers is relatively low; the measurement efficiency is high; the method is simple and efficient; and the high reliability of the measurement result can be guaranteed.

The invention relates to the technical field of precision engineering and industrial measurement, and particularly relates to a method for measuring engineering collimation parameters of an accelerator. The method is characterized in that a coordinate transformation relation between a calibration theoretical value and a measured installation value of mechanical equipment is established, and attitude parameters of the equipment are solved according to a singular value decomposition method, so that a problem of collimation parameter solving under the conditions of a large angle, eccentricity ofa coordinate system and existence of gross errors is solved by adopting a damped least squares method, a structured total least squares method and a quasi-stable estimation method. The method can be used by being matched with a laser tracker, a portable measuring arm or a total station instrument so as to complete the calculation of the calibration parameters; the collimation parameters can be calculated at any angles; the collimation parameters can be accurately calculated without moving a coordinate system when the coordinate system is eccentric; and the collimation parameters can be calculate without the loss of precision when there is a gross error. The method improves the calculation efficiency and precision and has robustness.

The invention discloses a high-precision engineering-measurement centering rod device. The high-precision engineering-measurement centering rod device comprises a centering rod, a limiting device, a detachable conical head arranged at the bottom end of the centering rod, a water level assembly fixedly connected on the centering rod, a left supporting assembly and a right supporting assembly, wherein the left supporting assembly and the right supporting assembly are symmetrically arranged on the two sides of the centering rod; a left connecting rod and a right connecting rod are fixedly connected with the top end of an F-shaped support separately, and the F-shaped support is fixedly connected with the centering rod; a fine adjustment assembly and a fast adjustment assembly which are capableof adjusting the length of the left supporting assembly and the length of the right supporting assembly are also arranged on the left supporting assembly and the right supporting assembly respectively; the water level assembly comprises a right pipe water level and a left pipe water level which are perpendicular to each other, and the two side edges of the limiting device are in contact cooperation with the left connecting rod and the right connecting rod respectively so that the left connecting rod and the right connecting rod can be parallel to the right pipe water level and the left pipe water level respectively. By means of the high-precision engineering-measurement centering rod device, the measurement precision of the centering rod can be effectively increased, adjustment of the water levels can be achieved through the fine adjustment assembly and the fast adjustment assembly, and different using requirements are met.