33results about How to "Effective control of precision" patented technology

The invention relates to a PCB (printed circuit board) back drilling method. The PCB back drilling method comprises the following steps: fixing a PCB on a machine table, and mounting a drill bit on a drilling machine; selecting a target layer, and determining an actual control depth h1 of the target layer; and determining a back drilling control depth h of the PCB according to the actual control depth h1 of the target layer and a preset safety length M of a stub and controlling the drill bit to drill a hole drilling machine control system. According to the PCB back drilling method, influence of thickness uniformity of the board, cone height of a drill tip and copper/ tin-plating process variation on the accuracy of the control depth can be reduced; and through introduction of the safety length M of the stub, the precision of the PCB back drilling control depth h can be effectively controlled, thus achieving precision control of the stub and eliminating adverse effects of the stub on a signal.

The invention discloses a method for manufacturing force responsive photonic crystal materials based on inverse compressing nano-forming technology. Electron beam lithography technology and reactive ion etch technology are employed. A nanometer magnitude pattern is etched on a rigid template to serve as a mother template according to preset photonic crystal structure parameters. An elastic polymer soft template with an inverse nanometer magnitude pattern can be made and serves as a secondary template. With highly elastic gel as filling material and visco-elastic polymer as moulding material, the pattern on the mother template is copied on to the visco-elastic polymer in a high fidelity way through inverse compressing, so as to produce nanometer magnitude and structure-controllable force responsive photonic crystal. Compared with the prior art, the method has the advantages of simple process, short flow, easily controlled technological parameters, repeatedly usable templates, high product precision level, stable and reliable product quality and low cost.

A micro pipette sensing device includes a micro pipette and a sensing device. The micro pipette includes a main portion, an operation portion and at least one tube portion. The tube portion defines an operation space therein. The sensing device is located at a proper position in the operation space of the tube portion. The sensing device includes a MEMS flow sensor for sensing a gas movement in the operation space, thereby effectively improving the precision of solution to be taken and therefore improving the precision of the overall measurement and analysis results.

The invention discloses a method for preparing a force response photonic crystal material on the basis of a nano molding technique. The method comprises the following steps: etching a main template according to pre-designed photonic crystal structure parameters, preparing an elastic polymer soft template with inverse nano-grade patterns, and by taking the soft template as a secondary template, 'copying' the patterns on the main template into a high -elasticity gel matrix layer in a 'high-fidelity 'manner in a mode of three-step pattern transfer so as to fix the position of crystal lattice of photonic crystal; filling the crystal lattice with a viscous polymer so as to obtain a single-layer high-elasticity gel-viscous polymer composite layer with a photonic crystal structure, and implementing a layer-by -layer embossing method,thereby obtaining the force response photonic crystal material. Compared with the prior art,the method disclosed by the invention has the characteristics that the process is simple, the procedure time is short, process parameters are easy to control, the templates can be repeatedly used, and a product is high in precision grade, stable and reliable in quality and relatively low in cost, and the like.

The present invention discloses a preparation method of force responsiveness nanometer magnitude photonic crystal materials. Through adoption of the electron beam lithography technology and the reactive ion etch technology, a rigid template with a nanometer magnitude pattern is etched and taken as a filling template according to photonic crystal structure parameters designed in advance, high-elastic gel with good mechanical property is taken as matrix materials, and a visco-elastic polymer is taken as filling materials; and through the mode of the filling template, the photonic crystal pattern designed in advance in the high fidelity mode is transferred into the visco-elastic polymer, and the nanometer magnitude and structure controllable photonic crystal materials with force responsiveness are prepared through spin coating, stacking and the like. Compared to the current technology, the preparation method of force responsiveness nanometer magnitude photonic crystal materials is simple in technology and short in flow, technology parameters are easy to control, the template can be reused, the precision of products is high in level, the quality is stable and reliable, and the cost is low, etc.

The invention belongs to the technical test field of the fuel injection system of an aerospace engine, and in particular relates to a swirler air flow test bench for a fuel nozzle. It includes an external air source mechanism, a working chamber and an exhaust chamber connected in sequence through the air pipe; the air pipe between the external air source mechanism and the working chamber is provided with a stop valve, an oil-gas separator, a regulating valve, a rotameter, A primary pressure fine-tuning assembly and a first pressure gauge; a secondary pressure fine-tuning assembly is provided on the air pipe between the working chamber and the exhaust chamber; a second pressure gauge is provided on the working chamber; the primary pressure fine-tuning The assembly includes a first-stage regulating valve and a first-stage high-precision fine-tuning regulating valve arranged in parallel; the second-stage pressure fine-tuning assembly includes a second-stage regulating valve and a second-stage high-precision fine-tuning regulating valve arranged in parallel. The present invention also relates to a method for conducting tests using the above-mentioned test bench.

The invention relates to a missile launcher technology. In order to solve the problems of easy embrittlement during long-term storage of an easily-cracking front cover and potential safety hazards due to a large quantity of fragments after the cover is broken after launched, the invention provides a composite easily-cracking front cover opened in one side and a making method of the composite easily-cracking front cover. Compared with the prior art, the composite easily-cracking front cover has the advantages and the beneficial effects of light weight, high strength and good compaction due to the adoption of a composite, and can ensure that the front cover structure is more reasonable in performance and is greatly improved in sealing property; and made by adopting a mold, the composite easily-cracking front cover has the advantages of capability of effectively controlling precision and ensuring that cover breaking pressures are consistent, rapidness, high efficiency and stable quality; and an opened cover body can not be separated from the launcher so as to eliminate potential safety hazard caused by scattering broken fragments after the cover is opened. The composite easily-cracking front cover is formed through medium-temperature curing, can be reliably used under the condition of high-temperature and low-temperature environments, and is difficult in embrittling and cracking.

The invention is suitable for the technical field of control and provides a control method and a control device of a shielding door and a radar. The control method of the shielding door comprises thesteps of using the radar for monitoring a preset space to monitor at a first working frequency to obtain a first monitoring result after receiving a shielding door opening information; if the first monitoring result is that a target does not exist, transmitting a first control signal, wherein the first control signal is used for indicating the shielding door to be closed; if the first monitoring result is that the target exists, using the radar to monitor at a second working frequency to obtain a second monitoring result, wherein the first working frequency is less than the second working frequency; and if the second monitoring result is that the target exists, transmitting a second control signal, wherein the second control signal is used for indicating the shielding door to keep a current open state. Through the method, the shielding door control accuracy can be effectively improved, the service life of the radar can be prolonged, and the reliability and adaptability of the radar canbe enhanced.

The invention provides a rectangular sealing part manufacturing method. The method includes the first step of drawing a drawing of a rectangular sealing part according to the required shape and dimensions of the part, the second step of designing a rectangular sealing ring mould according to the drawing, wherein the designed height of the mould is not allowed to be larger than the width of a nylon column of a slitter machine, the third step of conducting vulcanization to form the rectangular sealing parts according with the drawing, then overlaying the rectangular sealing parts to reach a certain thickness and placing the overlaid rectangular sealing parts into the rectangular sealing ring mould for integral vulcanization to obtain a rectangular sealing ring, and the fourth step of propelling the rectangular sealing ring through gas to enable the rectangular sealing ring to be arranged on the nylon column of the slitter machine in a sleeved mode, and slitting rectangular sealing ring through the slitter machine to obtain the rectangular sealing parts. The rectangular sealing part manufacturing method has the advantages that the manufacturing efficiency of the rectangular sealing parts is high, and the accuracy of the rectangular sealing parts can be effectively controlled.

The invention discloses a chart recognition method and device, equipment and a storage medium. The method comprises the steps that a text file containing chart data is acquired; converting the text file into a picture in a preset format; inputting the picture into a chart positioning detector, and outputting a positioning result of the chart data in the picture; wherein the chart positioning detector is obtained by training a preset neural network through a sample data set containing sample chart data. The text file containing the chart data can be a text file of any format type, the text file is converted into the picture, the operation that in the prior art, a normative protocol needs to be used for analyzing the position of a text positioning chart is avoided, the converted picture is directly input into the pre-trained chart positioning detector, and the positioning accuracy of the chart positioning detector is improved. Therefore, the technical problems that the efficiency of identifying the chart from the text file is low and the accuracy of identifying the chart is low in the prior art can be solved.

The invention discloses a highly integrated electric driving wheel, and belongs to the technical field of movable equipment driving wheels. The electric driving wheel is provided with an integrated support, one side of the integrated support is provided with a power cavity, a stator assembly is mounted in the power cavity, the other side of the integrated support is provided with a speed reduction cavity, a part of or all gear bodies are mounted in the speed reduction cavity, a shaft hole is formed between the speed reduction cavity and the power cavity, a rotating shaft of a rotor assembly penetrates through the shaft hole and then is meshed and matched with the gear body to form transmission connection, and the outside of the integrated bracket extends outwards to form an integrated mounting platform. According to the technical scheme, the highly-integrated integrated support has the functions of a motor shell, a reduction gearbox body, an installation support and the like, the effects of greatly reducing parts, shortening the assembly process route, reducing the comprehensive error of a machining size chain and the like are achieved, the part precision, the product performance and the consistency of batch products are effectively controlled, the rotation radius of the electric driving wheel is reduced to the maximum extent so as to save the installation space, vibration, noise and other adverse factors caused by assembly errors are effectively avoided, and the comprehensive performance of equipment is improved.

The invention belongs to the technical field of steel rolling equipment, particularly relates to an improvement of a short-stress rolling mill structure, and provides a short-stress rolling mill whichis capable of automatically adjusting the prestress of roll gaps, and is high in machining precision and high in production efficiency. The short-stress rolling mill comprises a pull rod arranged ina rack body and axially fixed, wherein an upper roller box and a lower roller box are arranged on the upper side and the lower side of the rack body respectively; an upper main nut is arranged in theupper roller box; a lower main nut is arranged in the lower roller box; and the pull rod is connected between the upper main nut and the lower main nut through right-hand threads and left-hand threads. The short-stress rolling mill is characterized in that main oil cavities are formed between the upper part of the upper roller box and the lower part of the upper main nut and between the lower partof the lower roller box and the upper part of the lower main nut, and oil return disc springs of the main oil cavities are arranged between the pull rod and the upper roller box and between the pullrod and the lower roller box; and a prestress system of the pull rod and a real-time roller box distance monitoring system are arranged on the rack body.

The invention discloses a process method for bending and forming a straight-through vehicle frame inner beam with a hole. The original process mode that only part of a plug welding hole is formed in the inner beam is changed, and is not equal to the vehicle frame loading efficiency through the process method that an inner beam hole is drilled in a sleeving manner after the inner beam and the outerbeam are embedded. By improving the process of realizing all hole sites of the inner beam and bending, the purposes of improving the precision of a hole system after the inner beam is formed and thealignment precision of the hole system after the inner beam and the outer beam are embedded, reducing the working strength of the inner beam of the sleeve drill and improving the working efficiency are achieved.

The invention discloses a tunnel underground excavation pipe shed guide pipe drilling construction precision control method. The method comprises the following steps that S1, a guide wall is installed; s2, a working platform is erected, a drilling machine is in place, and it is ensured that the axis of a drilling rod of the drilling machine is matched with the axis of an orifice pipe; s3, drilling is conducted, specifically, the height of a drilling machine platform is determined according to the adjustable range of a drilling machine and the drilling sequence, and due to the fact that the drilling sequence of the drilling machine is conducted from the high hole site to the low hole site, the position of the platform is gradually lowered from top to bottom correspondingly; s4, auxiliary positioning is conducted through a laser demarcation device, deviation adjustment is conducted in the drilling process of the pipe roof pipe, and one-time positioning adjustment is conducted on a section of pipe roof pipe to be drilled; s5, a support is adjusted, and the drilling deviation of the pipe roof pipe is adjusted by adjusting the support; and S6, a stop-grouting plug is installed. The problem can be effectively solved by adopting a method for assisting precision control through the laser demarcation device, and the overall precision when the pipe shed pipe is drilled into the guide pipe is guaranteed.