31results about How to "Avoid sanding" patented technology

The invention relates to the technical field of polishing devices, in particular to a multi-aperture bearing ring all-dimensional uniform polishing device which comprises a polishing table, a supporting plate is arranged at the top of the polishing table, a hydraulic rod is arranged at the bottom of the supporting plate, a polishing box is arranged at the movable end of the hydraulic rod, and a second screw is rotationally arranged in the polishing box. The other end of the second screw extends out of the grinding box and is provided with a rotating block, the pulling block is pulled outwards to drive the inserting rod to be disengaged from the inserting hole in the side wall of the grinding box, then the rotating block can be conveniently rotated, then the rotating block is rotated to drive the second screw to rotate, and a second threaded block outside the second screw is further driven to move. And the second motor can drive a grinding rod to work to comprehensively grind the outer ring and the inner ring of the multi-aperture bearing, and the situation that multiple devices are used for comprehensively grinding the outer ring and the inner ring of the multi-aperture bearing is avoided.

The invention discloses a numerical simulation method for evaluating gas well sand production critical yield. Mainly solves the problem of sand production of the gas well caused by overhigh production pressure difference and gas production speed in the gas testing and production process after the existing gas well is fractured. The method is characterized by comprising the following steps: establishing a gas well sand production critical mathematical model; according to a gas phase flow equation, the critical bottom hole flowing pressure, the critical production pressure difference and the critical production speed in the critical state are obtained through calculation, the critical flow speed and the critical yield in the production process are obtained according to different wellhead pressure changes, and a reasonable oil and gas well working system is formulated according to the critical flow speed and the critical flow. According to the numerical simulation method for evaluating the gas well sand production critical yield, the critical flow velocity and the critical flow in the production process can be obtained according to different wellhead pressure changes, so that a reasonable oil and gas well working system is formulated, and formation sand production is prevented.

The utility model discloses a building PC (polycarbonate) prefabricated laminated slab mould with a corner leaking stoppage function, which belongs to the technical field of concrete prefabricated parts and comprises four groups of retaining edges and a bottom plate, the retaining edges are arranged on the top surface of the bottom plate, and the adjacent retaining edges are perpendicular to each other; the anti-leakage structure further comprises a first anti-leakage assembly, the first anti-leakage assembly is arranged at the intersection of the flanges, the first anti-leakage assembly comprises an inner L-shaped baffle and an L-shaped mounting plate, and the two sides of the L-shaped baffle are attached to the inner side walls of the flanges. The L-shaped baffles are arranged to be attached to the inner sides of the flanges, the structure is simple, convenience and practicability are achieved, concrete can be prevented from entering gaps between the flanges, meanwhile, the concrete is prevented from leaking outwards, demolding of the laminated slab is facilitated, the quality of the laminated slab is guaranteed, polishing of the laminated slab is avoided, the machining cost is reduced, and the production efficiency is improved. And gaps smaller than the L-shaped baffles can be shielded, the application range is widened, and meanwhile installation is convenient.

The invention relates to the technical field of optical lens polishing, in particular to a rough polishing device for optical lens machining, three workpiece bodies only need to be manually placed on two first round rods, then a first connecting block is pushed up and down once, clamping operation of the three workpiece bodies can be completed at the same time, operation is convenient and fast, and efficiency is high. In the clamping process, the three workpiece bodies cannot deviate, and the problems that in the prior art, multiple workpiece bodies are clamped at the same time, operation is difficult, and alignment is not easy are solved; a rough grinding device for optical lens machining comprises a connecting frame, a sliding block, a circular ring, a first fixing block, a connecting plate, a first spring, a first round rod, a second round rod, a first connecting block, a first magnet, a grinding assembly, a driving assembly and a fixing assembly. All the side plates are jointly and fixedly connected with a connecting frame; at least four sliding blocks are arranged on the connecting frame; the leftmost sliding block is fixedly connected with the connecting frame, and the other leftmost sliding blocks are in sliding connection with the connecting frame; and each sliding block is fixedly connected with a circular ring.

The invention discloses a self-adaptive track sanding device and method for a complex curved surface. The device comprises a flange seat, a universal cross arranged at the front end of the flange seat, a motor body arranged in the universal cross, a brake ring and a polishing disc, wherein the brake ring and the polishing disc are arranged at the output end of the motor body; the universal cross is of a circular ring structure and is rotationally connected with the front end of the flange base through a first pin shaft, the upper portion of the motor body penetrates through the universal cross, and the motor body and the universal cross are rotationally connected through a second pin shaft. Connecting lines respectively formed by the first pin shaft and the second pin shaft are crossed, and the motor body realizes two-degree-of-freedom rotation through the first pin shaft and the second pin shaft. The motor body rotates through the universal cross to adjust the binding face between the grinding disc and the to-be-ground curved surface to achieve self-adaption to the to-be-ground curved surface, it can be guaranteed that the normal of the grinding disc coincides with the normal of the curved surface without precisely adjusting the posture and the positioning precision of a robot, and therefore the good grinding effect is obtained.

The utility model discloses a special-shaped expanding anchoring body. The anchoring body of an anchor rod cable is in a full-length expanding mode or comprises an upper section and an expanding section. When the anchoring body is expanded in the full length, the anchoring body comprises an inner-layer structure and an outer-layer structure, and when the anchoring body comprises an upper section and an expanding section, the expanding section still comprises the inner-layer structure and the outer-layer structure; the inner layer structure comprises an inner core consolidation body and reinforcing bars, and the reinforcing bars are wrapped in the inner core consolidation body in the transverse direction; the reinforcing bars comprise anchor bars; the outer-layer structure is an outer-layer consolidation body without reinforcing bars, or the diameter of the outer-layer consolidation body is larger than that of the upper section at the same time; the strength of the inner core consolidation body is higher than that of the outer layer consolidation body; the consolidation agent conveying pipeline and the discharge outlet for forming the outer layer consolidation body through pouring and the consolidation agent conveying pipeline and the discharge outlet for forming the inner core consolidation body through pouring are respectively arranged on different machines and tools; and the inner core consolidation body and the outer layer consolidation body are directly bonded, or the expanded section is provided with a corrugated pipe along the longitudinal direction, and the outer layer consolidation body is meshed with the inner core consolidation body through the corrugated pipe.

The utility model belongs to the technical field of automation equipment, and particularly relates to a small magnetic shoe surface texture processing device. The magnetic shoe mounting seat comprises a magnetic shoe mounting seat body, the magnetic shoe mounting seat body comprises a magnetic shoe bottom fixing part and a side connecting body part, and the top wall surface of the magnetic shoe bottom fixing part is arc-shaped. In the machining process, the magnetic shoe is placed at the magnetic shoe bottom fixing part, the top wall face of the magnetic shoe bottom fixing part is arc-shaped, matched with the bottom of the magnetic shoe and high in fitting degree, the front end and the rear end of the magnetic shoe are abutted and fixed through the end fixing piece, the magnetic shoe is prevented from shaking, then the two sides of the magnetic shoe are clamped and fixed through the side clamping piece, and the magnetic shoe bottom fixing part is fixed to the magnetic shoe bottom fixing part. According to the magnetic tile surface polishing device, multi-directional fixing is formed, stability is high, after fixing is completed, the magnetic tile surface polishing assembly is used for polishing the surfaces of the magnetic tiles, protruding particles on the surfaces of the magnetic tiles are removed, polishing is comprehensive, the surfaces of the magnetic tiles are kept smooth, lines are clear, meanwhile, the magnetic tile surface polishing assembly can avoid too deep polishing in the polishing process, and the surface quality of the magnetic tiles is guaranteed.

The present invention relates to the technical field of output shaft grinding, and specifically, to a grinding device and a grinding method for the production of dual-axis motor output shafts. The present invention comprises a machine body, a triangular chuck is provided at the end of the machine body, a support seat is provided on the surface of the machine body, symmetrical sensors are provided on both sides of the surface of the support seat, a moving frame is provided on the surface of the machine body, and a grinding assembly is provided at the end of a gear rod. The present invention grinds the surface of the output shaft by moving the sand belt horizontally by the moving frame, and the friction roller and the surface of the output shaft generate friction and rotate, so that the gear rod provided at the end of the transmission roller rotates, so that the driven gear drives the extension rod to rotate and the collecting roller rotates on the inner wall of the second fixed frame, and the collecting roller stretches the sand belt wound on the surface of the clockwork spring, so that the surface of the sand belt is always in contact with the surface of the output shaft during the stretching process and the grinding area with the output shaft is increased, thereby avoiding grinding at the position where the surface of the sand belt and the output shaft are in contact, and improving the service life of the sand belt.

The present invention discloses a method for deep unblocking of a fixed pipe column of an oil well with complex blockage in an offshore oil field. The present invention adopts a new unblocking process of "bubble-unblock-wash-test-pressure-wash", and the specific method is: treatment of organic scale in the wellbore and near the well: conduct injection process, pump-inject organic unblocking agent, and soak for 12 to 48 hours; treatment of inorganic scale in the wellbore and near the well: pump-inject inorganic unblocking agent, shut down the well for 6 to 24 hours after unblocking; well washing operation; stepped pressure test injection, shut-in test; treatment of composite blockage in medium and long-distance wells: staged high pressure and large liquid volume injection; well washing operation. The method of the present invention is suitable for unblocking complex blockages in oil wells with heavy crude oil or polymer organic scale and inorganic scale and large blockage radius in offshore oil fields, and has the advantages of reducing operating costs and simplifying processes; conducting test operations, with flexible selectivity to ensure the effectiveness of measures; high pressure does not break the reservoir, preventing sand from coming out of the formation or rapid decrease in liquid volume after operation; large liquid volume injection, unblocking and instantaneous replenishment of formation energy.

The invention discloses a device and method suitable for pile foundation bearing capacity detection, and belongs to the technical field of pile foundation bearing capacity detection.The device comprises a soil body, a pile foundation body is arranged in the soil body, the pile foundation body comprises a reinforcement cage and connecting ribs distributed on the reinforcement cage at equal intervals in a surrounding mode, and supporting assemblies are arranged on the periphery of the pile foundation body; the upper end of the pile foundation body is provided with a bearing capacity testing assembly, the bearing capacity testing assembly comprises a bearing structure and a bearing top plate at the upper end of the bearing structure, and the bearing top plate is provided with a jack. The pile foundation bearing capacity test method has the advantages that the pile foundation bearing capacity test device can be constructed at the pile top after being maintained to reach the design strength, is convenient to disassemble and can be repeatedly used, the problem of steel bar damage when concrete is disassembled in a traditional mode is solved, the flexibility of the pile foundation bearing capacity test is improved, the time is shortened, and the test cost is reduced.

The invention provides air conditioner heat dissipation pipeline punching equipment and a punching method, and belongs to the technical field of air conditioner heat dissipation pipe manufacturing, the air conditioner heat dissipation pipeline punching equipment comprises a bearing table, two supporting columns are fixedly connected to the right side of the upper surface of the bearing table, the number of the supporting columns is two, and the sides, close to the middle positions, of the two supporting columns are each fixedly connected with two connecting plates; two supporting rods are fixedly connected to the left sides of the upper surfaces of the two connecting plates, a bearing plate is fixedly connected to the upper surfaces of the two supporting rods, a driving wheel can drive a transmission wheel to rotate under the action of a transmission belt, and the transmission wheel is fixedly connected to the surfaces of the connecting rods; the polishing head rotates to conduct polishing work, burrs on the edge of the inner wall of a hole can be polished to be smooth, punching and polishing work can be conducted at the same time, it is avoided that a large amount of time is spent on polishing the burrs on the inner wall of the hole in the follow-up process, the workload is relieved, meanwhile, the influence on the sealing performance and installation of a heat dissipation pipe is avoided, and practicability is improved.

The utility model discloses a cylindrical grinding machine for machining mechanical parts, which belongs to the technical field of cylindrical grinding machines and comprises a machining table, a fixing ring is fixedly connected to the upper surface of the machining table, an outer gear ring is rotatably connected to the inner side of the fixing ring, a driving mechanism is arranged on the outer side of the outer gear ring, and an elastic telescopic rod is fixedly connected to the inner side surface of the outer gear ring. The lower end of the elastic telescopic rod is fixedly connected with a hinge piece, the lower surface of the hinge piece is fixedly connected with a bearing plate, the lower surface of the bearing plate is detachably provided with an arc-shaped grinding plate, and supporting assemblies are arranged on the two sides of a fixing ring, so that linear contact between a grinding wheel and the inclined face of the cone can be avoided, and the grinding efficiency is improved; and meanwhile, excessive grinding is avoided, the grinding quality of the cylindrical grinding machine is improved, long cylindrical and conical products can be ground, and therefore the application range of the cylindrical grinding machine is widened.

The present application discloses a construction method of reinforced concrete and ceramic particles for a landscape bridge and its bridge deck structure, including the following steps: step S20: setting a shear nail layer according to the requirements of the design drawings; step S30: arranging a plurality of precast concrete pads in a plum blossom shape on the bridge deck; step S40: fully tying φ12 steel mesh on the top surface of the precast concrete pads along the longitudinal and transverse directions of the bridge deck; step S50: pouring concrete to form a concrete layer; step S60: fully paving a glass fiber anti-cracking net on the top surface of the concrete layer; step S70: using a scraping tool to evenly apply the evenly mixed PUNM polyurethane adhesive on the glass fiber anti-cracking net; step S80: evenly spreading ceramic particles on the top surface of the sealing bottom layer; step S90: paving the surface layer ceramic particle mixture and finishing the cover surface. The bridge deck composite structure obtained by the construction method has mature construction technology of base bolts + reinforced concrete, good integrity, safe structure, and reliable durability; the middle layer of glass fiber anti-cracking net + PUNM polyurethane sealant has good sealing performance, which effectively avoids water seepage, rust, alkali and other phenomena in the base layer.

The invention discloses multi-color heating coloring glassware forming equipment and an implementation method, and belongs to the technical field of glassware processing. The multi-color heating coloring glassware forming equipment comprises a base, a second sliding rod is transversely welded to the upper end of the base, and a connecting frame is transversely and slidably arranged in the second sliding rod. According to the high-temperature glassware forming device, the problems that the amount of glass liquid fed into a mold cannot be accurately controlled, the glass liquid overflows and is wasted in an existing glassware forming device are solved, an extrusion block is longitudinally pressed through a telescopic rod, so that the extrusion block extrudes the glass liquid to form high-temperature glassware, and the high-temperature glassware is formed. The redundant glass liquid flows to the upper end of the mold, the glass liquid at the upper end of the mold is cut by the cutting piece along with extrusion of the telescopic rod, the cut glass liquid is subsequently pushed by the cutting piece, so that the glass liquid is stored in the collecting barrel, and the glass liquid stored in the collecting barrel can be directly and repeatedly used.

The invention relates to the technical field of grinding, and discloses a wood shelf after-cutting area grinding device which comprises a workbench, U-shaped frames are fixedly connected to the two sides of the workbench, a motor is fixedly connected to the bottom of the workbench, and a transmission shaft is fixedly connected to the output end of the motor; the end, away from the motor, of the transmission shaft is fixedly connected with a fixing frame, and the surface of the fixing frame is fixedly connected with an electric push rod. By arranging the fixing mechanism, a circular wood plate is firstly placed on the surface of a rotating disc, then an electric push rod is started to push the rotating disc to move upwards, when the rotating disc moves, a sliding plate can be driven to move upwards, and when the sliding plate moves, an elastic plate can be pushed to move upwards and extrude the rotating disc; when the elastic plate is extruded, the middle portion of the elastic plate can push the sliding groove plate to move in the direction close to each other, when the elastic plate is bent to a certain position, the rotating disc can be limited, and when the sliding groove plate moves, the sliding frame can be pushed to move in the direction close to each other.

This invention discloses a detachable lifting clamp fixture for ships. It includes a connecting assembly, a driving assembly, and a suspension assembly. The connecting assembly includes a clamping member and a top support member. The clamping member can clamp and fix the web of a pre-shaped profile, and the top support member can abut against the panel of the pre-shaped profile from top to bottom. The driving assembly is connected to the connecting assembly to drive the connecting assembly to clamp and release the web. The suspension assembly is connected to the connecting assembly and is used to install the lifting clamp. Through the clamping member and the top support member, the pre-shaped profile can be detachably fixed in a clamping manner, and the lifting weight can be applied to both the web and the panel simultaneously. Compared with welding the lifting clamp, this avoids welding work, improves lifting efficiency, reduces lifting costs, and reduces damage to the hull structure. Furthermore, by distributing the weight, it reduces the risk of deformation and damage to the hull structure, especially the panel of the pre-shaped profile.

The invention relates to an automatic efficient slitting system for moisture-proof paper tube production, which comprises a storage rack, a pressing roller, a tensioning assembly, a polishing assembly, a paper winding assembly and a hair removal assembly, and paper sequentially passes through the pressing roller, the tensioning assembly, the polishing assembly, the paper winding assembly and the hair removal assembly in the conveying process. The tensioning assembly is used for keeping the tensioning performance of paper in the paper conveying process, the grinding assembly is used for grinding the lower end face of the paper on the lowest layer to be smooth and grinding the surfaces of other paper to be rough, the paper winding assembly comprises a motor and a paper winding roller driven by the motor, and the paper winding roller is used for conducting paper winding conveying on the multiple pieces of paper. A plurality of adsorption holes used for adsorbing paper are formed in the paper winding roller, the hair removal assembly is used for conducting hair removal treatment on the surface of a paper tube on the paper winding assembly, and the problems that in the paper winding process, the tension degree of the paper cannot be kept, gaps are likely to occur, the surface of the wound paper is smooth, and the paper winding efficiency becomes poor due to the fact that slipping is likely to occur in the paper winding process are solved.

The utility model relates to the technical field of metal part machining, and discloses a metal part grinding device which comprises a rack, a grinding cylinder used for containing grinding liquid is arranged on the rack, a lifting assembly is arranged at the upper end of the grinding cylinder and comprises a cylinder cover moving in the Z-axis direction, a support is arranged at the lower end of the cylinder cover, and a lifting assembly is arranged at the lower end of the support. A rotating assembly is arranged on the support and comprises a driving shaft arranged on the rack, a screen frame is arranged on the driving shaft, and a driving assembly is arranged on the barrel cover; through cooperative use of the lifting assembly, the driving assembly and the rotating assembly, the driving assembly drives the screw rod to do reciprocating motion, reciprocating spiral lifting of the stirring shaft is achieved in cooperation with the support, then parts placed in the screen frame are driven to rub with grinding materials in grinding liquid, and grinding of metal workpieces is achieved; meanwhile, high temperature and grinding dust can be avoided, and the beneficial effects of being high in grinding efficiency and good in using effect are achieved.

The application discloses a kind of production device of aluminum-clad door and window, it is related to aluminum-clad door and window production technical field, including clamping box, the inside of clamping box is equipped with clamping chamber, the inside welding of clamping chamber is equipped with guide pipe, the inside sliding connection of guide pipe is equipped with guide plate, the side end surface of guide plate is welded with clamping plate, the side end surface of clamping plate is welded with reset rod, the outside of reset rod is sleeved with reset spring, the unified height of the present application is fixed by wood board and aluminum profile, then control initiative roll rotation, the two sides of wood board and aluminum profile are all in unified vertical plane, so that wood board and aluminum profile are all fixed in same position, then wood board and aluminum profile can be simultaneously cut from the same angle by cutting edge, so that the riveting of each side aluminum profile and wood board is facilitated, and all wood board and aluminum profile are cut into same length specification, so that wood board and aluminum profile can be quickly adhered and formed once, without secondary processing.

The invention relates to a pipe annular abrasive belt grinding device which comprises a mechanical arm, a connecting device arranged on the mechanical arm and an abrasive belt and further comprises a driving device, a tensioning device and a grinding frame which are arranged on the connecting device, and the grinding frame is provided with a grinding groove. The moving devices are symmetrically arranged on the two sides of the grinding groove. The pressing device is arranged on the moving device; the grinding roller is rotationally arranged on the pressing device; the auxiliary rolling wheels are rotationally arranged on the pressing device and symmetrically located on the two sides of the grinding rolling wheel. The gap bridge roller is rotationally arranged on the polishing frame and the connecting device; the abrasive belt is movably arranged on the driving device, the tensioning device, the grinding roller and the gap bridge roller in a sleeving mode, the pressing device symmetrically presses the abrasive belt on the outer circle face of the pipe through the grinding roller, and the auxiliary roller is used for controlling the grinding diameter. According to the device, the two sides of the pipe are symmetrically ground at the same time, the grinding efficiency is greatly improved, meanwhile, the grinding size is accurately controlled through cooperation of the positioning wheel and the pressing device, and the grinding quality is high.

The invention discloses a welding process of a pure silver-low alloy steel composite plate for an electronic-grade reduction furnace bell jar. The process sequentially comprises the steps of groove machining, specifically, a base layer is machined into a Y-shaped groove, and a groove is formed in a composite layer; bottoming, filling and covering the low alloy steel base layer; carrying out nondestructive testing on the base layer; bottoming the pure silver composite layer, and filling the cover surface; and nondestructive testing of the whole weld joint is realized. And according to different material characteristics of the base layer and the composite layer, corresponding welding methods and welding process parameters are selected for welding. The method is simple and convenient to operate, the polishing procedure is reduced, the labor intensity is reduced, meanwhile, the defects such as air holes are reduced, the weld joint performance and the welding stability are guaranteed, the welding quality is improved, a base layer and a composite layer can be subjected to 100% RT detection II-level qualification and 100% PT detection I-level qualification according to NB / T47013, and a guarantee is provided for safe use of equipment.

The invention relates to the technical field of grinding and processing of special-shaped soft copper busbars, and specifically to a grinding and processing device for special-shaped soft copper busbars, comprising a casing and an annular transport rail, which is arranged at the top of the bottom wall of the casing and is equipped to drive the special-shaped soft copper busbar to move through a clamp installed on the outside, an adjustment component, which is arranged at the top of the bottom wall of the casing, the adjustment component is in two groups and is located on both sides of the annular transport rail, and is equipped to adjust the position of a grinding component, and a grinding component is arranged on a side of the adjustment component close to the annular transport rail, the grinding component is in two groups and is symmetrically installed about the annular transport rail, and is equipped to grind the special-shaped soft copper busbars. The invention can not only fix various special-shaped soft copper busbars for easy docking and grinding, but also recycle grinding debris.

The invention discloses end cover burr and impurity polishing and cleaning equipment which comprises a workbench and an end cover plate body and further comprises a transverse table slidably arranged at the top of the workbench in the front-back direction, two clamping assemblies symmetrically arranged at the top of the transverse table in the left-right direction and a polishing assembly arranged at the top of the workbench and located on one side of the workbench. The two clamping assemblies play a role in clamping the end cover plate body, the grinding assembly plays a role in grinding the end cover plate body, and the end cover plate body clamped on the two clamping assemblies is ground through the grinding assembly to achieve burr grinding.

This utility model discloses a protective fixture for impregnating a new energy flat wire oil-cooled motor. It includes a motor stator winding, a lower pressure plate at the bottom of the stator winding, an impregnation bracket at the bottom of the lower pressure plate, a sealing barrel around the stator winding, a lower sealing gasket between the bottom of the sealing barrel and the lower pressure plate, and an upper pressure plate at the top of the stator winding, with an upper sealing gasket between the top of the sealing barrel and the upper pressure plate. By using the upper and lower sealing gaskets, this fixture, when fully immersed in insulating varnish, forms a completely reliable sealed cavity on the stator's outer surface, effectively preventing the entry of insulating varnish. This ensures that no insulating varnish penetrates during the impregnation process, and the stator's outer surface remains clean after curing. This avoids oil cooling blockage and the need for subsequent polishing of the insulating varnish on the stator's oil circuit area, protecting the stator and ensuring that motor performance is not affected.

The invention discloses a rock core electrical property testing device and method, and relates to the technical field of rock core electrical property testing, and the rock core electrical property testing device comprises a closed testing box body, a rotary lifting flexible supporting device, a visual analysis module, a supporting device controller based on a chip, an electrical property testing device and an electrical property analysis module. According to the invention, the to-be-tested rock core in an irregular shape is automatically positioned and supported through the rotary lifting flexible supporting device and the supporting device controller based on the chip, so that the rock core is prevented from being cut, polished and the like, and the distortion of the measured electrical property result caused by the damage to the original structure of the to-be-tested rock core is avoided. The electrical performance test control circuit board and the electrical performance analysis module are combined, so that voltage and current data can be acquired in real time, and a detailed electrical performance test result of the core to be tested is analyzed and output based on a test value. The automation level, the test precision and the test efficiency of the core electrical property test can be obviously improved, and the operation difficulty and the maintenance cost are reduced.

The invention relates to the technical field of chemical analysis and detection of inorganic elements, and discloses a method for rapidly detecting inorganic arsenic in rice. The method for rapidly detecting the inorganic arsenic in the rice comprises the following steps: 1) adding a rice sample into an inorganic arsenic extracting agent, and carrying out ultrasonic extraction and centrifugation to obtain an inorganic arsenic extracting solution; (2) adding the modified magnetic beads into the inorganic arsenic extracting solution obtained in the step (1), and performing adsorption and magnetic separation to obtain a to-be-detected sample solution; and 3) activating the screen-printed electrode, and detecting the content of inorganic arsenic in the to-be-detected sample solution obtained in the step 2) by using the activated screen-printed electrode. According to the method, the inorganic arsenic in the rice is extracted and reduced through ultrasonic assistance, Cu (II) is removed through the modified magnetic beads, the silk-screen printing electrode is activated, the accuracy and sensitivity of detection of the content of the inorganic arsenic in the rice are improved, and finally rapid and accurate determination of the inorganic arsenic in the rice is achieved.

A reusable light guide pipe embedded assembly comprises a light guide pipe sleeve, a water stop rubber sleeve and a steel bar positioning ring, one end of the light guide pipe sleeve is provided with a tongue-and-groove, and the outer diameter of the end provided with the tongue-and-groove is larger than that of a light guide pipe sleeve body; the periphery of the light guide pipe sleeve is sleeved with at least two water stop rubber sleeves at intervals, and the water stop rubber sleeves are close to the ends of the light guide pipe sleeve. The periphery of the water stop rubber sleeve is sleeved with a reinforcing steel bar positioning ring for fastening, and the fastening degree of the reinforcing steel bar positioning ring meets the requirement that after the light guide pipe pre-embedded assembly is pre-embedded in a bare concrete wall, the light guide pipe sleeve can be pulled out of the bare concrete wall to form a light guide pipe mounting hole. When the light guide pipe pre-embedded assembly is pre-embedded in the bare concrete wall, the light guide pipe sleeve can be pulled out and reused, and the problems that a light guide pipe sleeve pre-embedded part is high in machining cost and long in construction period are effectively solved.

The invention provides a waterproof top cover for a prefabricated cabin, and belongs to the technical field of power equipment structures, and the waterproof top cover comprises a first top plate, an internal rainproof beam arranged at the bottom of the first top plate, and a fixing assembly mounted at the bottom of the internal rainproof beam. The split type top plate combination is matched with the precise bending butt joint mechanism, the welding workload is greatly reduced while the structural strength is guaranteed, the problems of large-area welding seam polishing and rusting are solved, reliable sealing between modules is achieved through the butt joint bending clamping structure, the defect of water seepage of joints of a traditional modular top cover is overcome, and the service life of the modular top cover is prolonged. According to the integrally-designed water dripping edge system, a traditional welding or screw fixing mode is replaced with an innovative bending forming technology, the installation procedure is simplified, the protection grade is improved, the overall weight is reduced through the optimized structural layout, transportation and hoisting operation is facilitated, and the production cost is reduced while the production efficiency is improved. And the waterproof performance and the installation convenience of the product are improved.

The utility model discloses a spiral milling cutter polishing device which comprises a polishing body, the front face of the polishing body is fixedly connected with an adjusting mechanism, the top of the polishing body is provided with a moving groove and an adjusting groove, the top of the polishing body is movably connected with a moving frame through the moving groove, and one side of the moving frame is fixedly connected with a rotating motor. A mounting assembly is fixedly connected to the driving end of the rotating motor, an adjusting seat is movably connected to the top of the grinding body through an adjusting groove, a grinding motor is fixedly connected to one side of the adjusting seat, a grinding wheel is fixedly connected to the driving end of the grinding motor, and a moving mechanism is fixedly connected to the interior of the grinding body; and through the arrangement of the moving frame, the rotating motor and the adjusting base, the precision of grinding the spiral milling cutter is improved, the situation that a blade of the spiral milling cutter is excessively ground or ground obliquely in the grinding process is avoided, and therefore the grinding effect is enhanced.

The invention belongs to the technical field of oil exploitation, and particularly relates to a soluble sand control screen pipe, a well completion pipe string and a method for a shale oil long horizontal well. The sieve tube at least comprises a sieve tube body, the screen pipe body is made of soluble alloy, a coating is arranged on the surface of the screen pipe body, and a plurality of kerfs are formed in the side wall of the screen pipe body. Connecting threads are respectively arranged on the outer side walls of the upper and lower ends of the screen pipe body. The soluble sand control screen pipe is connected with an oil pipe through the soluble hanging packer, and the shale oil long horizontal well completion pipe string is formed. After fracturing blowout is finished, wellhead pressure relief is completed, and oil pipe operation enters a well through a variable-diameter zone soluble hanging packer and a soluble screen pipe body; and when the soluble suspension packer reaches about 10 parts above a perforation section closest to a wellhead, a soluble ball is thrown for pressing and setting, then releasing is carried out after setting, and production is carried out after an oil pipe is pulled out. According to the soluble sand control screen pipe for the well, formation sand production is prevented from affecting production in the early stage, the screen pipe is gradually dissolved in the later stage, an original shaft is recovered after the well is washed, the well repairing frequency is reduced, and the production time rate is increased.