The invention discloses a method for preparing an X-ray absorption grating and an X-ray absorption grating. The manufacturing method comprises the following steps of: manufacturing grating grooves orgrating holes on a substrate to form a grating groove array or a grating hole array; washing the substrate with an organic solvent, water and a surfactant; adding a volatile solvent and a surfactant into the metal nanoparticles to prepare a suspension; under vacuum, filling the metal nanoparticle suspension into a grating microstructure, and settling the metal nanoparticles to fill the grating groove or the grating hole; detecting, if the filling is not uniform or metal nanoparticles are not distributed in the grating microstructure, continuing filling; cleaning the metal nanoparticles on thesurface of the substrate. The absorption grating comprises a substrate, wherein the grating groove array or the grating hole array is arranged on the substrate, and the grating grooves or the gratingholes are filled with metal nanoparticles. The performance of the absorption grating is very different from that of a grating made of a molten metal material, the manufacturing method is simple, the threshold is low, the cost is low, and the method is convenient to operate and achieve in a common laboratory.

Method for manufacturing X-ray absorption grating and X-ray absorption grating

The present invention discloses a method for preparing an X-ray gold transmission grating. The method firstly uses a metal catalytic etching technique to fabricate a silicon grating mask with a large groove depth and a steep and smooth sidewall, then electroplates and deposits gold in the silicon grating mask groove, and finally removes the silicon grating mask to obtain the gold transmission grating with the large groove depth and the steep and smooth sidewall.

Method for preparing X-ray gold transmission grating

The invention discloses a computer quilting machine based on detection of waste needle replacement. The computer quilting machine structurally comprises a sewing frame, a control console and a machineframe, wherein the sewing frame is connected with the machine frame in a track mode; the control console is locked on the machine frame; the sewing frame consists of side row frames, a transverse frame and a sewing roller; the side row frames are connected with the transverse frame in a mounting mode; the sewing roller is mounted on the side row frames; a roller plate is mounted on the sewing roller; the machine frame comprises a batts frame and a main frame; the batts frame is connected with the main frame in an assembled mode; the transverse frame comprises a row side frame and a needle replacing structure; and the row side frame and the needle replacing structure are mounted in an embedded mode and form an integrated structure. According to the computer quilting machine, the multi-position detection of the abnormity of waste needles is realized by strip fasteners, the roller plate and inner detecting strips, and the detection accuracy is high; the sewing roller rotates to transferthe waste needles, and the processing is carried out by new needles after the sewing roller rotates, so that the integrity of batts is protected to the maximum extent; and the waste needles are replaced and the new needles are mounted through the transverse frame, so that the waste needles are favorably replaced with the new needles in time and stored.

Computer quilting machine based on detection of waste needle replacement

The invention relates to the technical field of dish washing equipment, and particularly relates to a handheld dish-washing machine including a handle; a fixing plate is tightly adhered to one end ofthe handle; the fixing plate is of a U-shaped structure. The side, away from the handle, of the fixing plate is an open end. A bottom plate is arranged at the bottom of the open end of the fixing plate; a first cleaning pad is tightly bonded to the surface of the top of the bottom plate. A clamping plate is arranged at the top of the open end of the fixing plate, a second cleaning pad is tightly bonded to the bottom of the clamping plate, limiting columns are vertically and tightly bonded to the top corner of the side, away from the fixing plate, of the bottom plate, a baffle is tightly bondedto the middle of the side, away from the fixing plate, of the bottom plate, and a third cleaning pad is tightly bonded to the surface of the baffle. According to the invention, stable clamping can beguaranteed through the clamping plates and the bottom plate, dishes are not prone to falling off, stains on the surfaces of the dishes can be thoroughly cleaned away through the large and small cleaning pads, the surfaces of the dishes can be thoroughly cleaned away through high-frequency vibration of the ultrasonic vibration pieces, and the dishes can be thoroughly cleaned away conveniently.

Handheld dish washing machine

The invention discloses a preparation method of a high-opening-area critical angle transmission grating. The preparation method comprises the following steps: S1, preparing a mask plate; S2, depositing a silicon nitride layer on two sides of the monocrystalline silicon substrate, spin-coating photoresist on the surface of the silicon nitride layer, aligning the mask plate to the monocrystalline silicon substrate, and transferring the pattern in the mask plate to the monocrystalline silicon substrate to obtain a reference grating after two-side exposure and development; S3, carrying out double-sided chromium plating on the area, far away from the reference grating, of the monocrystalline silicon substrate, carrying out double-sided spin coating of the photoresist, and carrying out exposureand development to obtain a supporting structure; S4, carrying out double-sided spin coating of photoresist on the supporting structure of the monocrystalline silicon substrate, and then carrying outdouble-sided exposure; and S5, performing dry etching on the silicon nitride layer, performing wet etching on the monocrystalline silicon, and finally removing the silicon nitride layer to obtain thetransmission grating. According to the preparation method disclosed by the invention, high-precision double-sided exposure can be realized through a scanning interference field exposure method, and amask pattern with high phase double-sided matching precision is prepared for double-sided etching, so that the broadened area is reduced.

Preparation method of high-opening-area critical angle transmission grating

The invention is suitable for the technical field of grating micro-nano machining, and provides a preparation method of X-ray self-supporting blazed transmission gratings. According to the preparationmethod, metal catalytic etching acts as the core, and the principle of metal catalytic etching is that the silicon contacting the metal mask reacts with the etchant to be dissolved under the catalytic action of the metal so as to form a microstructure consistent with the mask through down-etching. The grating supporting structure prepared by the method does not broaden to the bottom so as to meetthe requirement of large effective use area of the gratings; metal catalytic etching is the wet etching method, the grating sidewall is quite smooth and can reach the order of 100nm RMS; and the metal catalytic etching technology does not require alignment so that the technology is simpler. In general, compared with the preparation methods in the prior art, the beneficial effects of the preparation method reside in that the requirements of large effective area and smooth sidewall of the X-ray self-supporting blazed transmission gratings can be simultaneously met; and alignment is not requiredso that the technology is simpler.

Preparation method of X-ray self-supporting blazed transmission gratings

The invention provides an automatic needle changing device According to the automatic needle changing device, a sewing device is arranged on one side of a mechanical arm, and a standby needle box isarranged on the other side of the mechanical arm; a needle changing device is arranged on the mechanical arm between the standby needle box and the sewing device; a sensor capable of realizing corresponding cooperation with knitting needles in the sewing device is arranged on the mechanism arm; the sensor, the sewing device, the standby needle box, and the needle changing device are connected witha control module through leads in connection cooperation The automatic needle changing device is simple in structure, is convenient to use, is capable of detecting the situations of the knitting needles in the sewing device in time, replacing the knitting needles in time when the knitting needles are damaged, and ensuring embroidery efficiency effectively

Automatic needle changing device

The invention relates to a portable and fast dishwasher. The dishwasher comprises a box body (1) and annular water pipes arranged in the box body; the box body (1) is cooperatively connected with a cover (22), the cover (22) is provided with an arc-cylinder-shaped baffle plate (28), a cross notch (23) is formed in the center of the cover (22) and cooperatively connected with a hemispherical flexible waterproof hood (25), and a set of upward spray heads (13) are uniformly connected to the annular water pipes. The portable and fast dishwasher has the advantages of being compact in structure, lowin cost, good in human-machine interaction and capable of quickly cleaning a single bowl.

Portable and fast dishwasher

The invention provides a small household portable grain harvester for a sunning ground. The small household portable grain harvester comprises a frame, wherein wheels, a conveyor belt, a collecting box, a gear transmission device, a belt wheel transmission device, a cart frame and grain sweeping blades are arranged on the frame. The grain harvester does not need a power device, and as long as an operator pushes the grain harvester to move forwards, the purpose of grain harvesting can be achieved through gear transmission and belt transmission; and the grain harvester is convenient to operate and simple in structure, great help is provided for general farmers, and the grain harvester has positive popularization significance.

Wang Hai

Papers

Preparation method of X-ray self-supporting blazed transmission gratings

Automatic needle changing device

Portable and fast dishwasher

Method for preparing X-ray gold transmission grating

Small household portable grain harvester for sunning ground