804results about How to "Avoid stress concentration" patented technology

The invention relates to the technical field of high polymer materials, and particularly discloses a high-strength polypropylene composite material for a filter plate and a preparation method of the high-strength polypropylene composite material. The preparation method of the polypropylene composite material comprises the following steps: uniformly mixing polypropylene, polyimide, maleic anhydride grafted polypropylene, nylon 6, a maleic anhydride grafted styrene-butadiene-styrene copolymer, aminated calcium carbonate, modified glass fiber, an antioxidant and a lubricant according to a mass ratio of 100: (12-18): (2-5): (1-2): (3-5): (3-7): (6-10): (0.2-0.5): (0.1-0.3), carrying out melt blending, extruding, cooling, granulating, and carrying out extrusion molding to obtain the polypropylene composite material. Through the synergistic effect of the nano calcium carbonate and the glass fibers, the mechanical property of polypropylene is improved, all the raw materials are crosslinked to form a uniform network structure, more energy is absorbed when a matrix is impacted by external force, and it is guaranteed that the filter pressing plate is not damaged when deforming under the high-temperature and high-pressure conditions; the obtained polypropylene composite material is high in strength, good in heat resistance and excellent in comprehensive performance.

The invention provides a back contact solar cell and a solar cell module, the back contact solar cell comprises a silicon wafer and a grid line structure, and the grid line structure comprises main grid lines and fine grid lines connected with the main grid lines. The grid line structure comprises a plurality of middle grid line sub-structures arranged in the first direction, a first edge grid line sub-structure closest to the first edge and a second edge grid line sub-structure closest to the second edge. The distance between the center line of the main grid line of the first edge grid line substructure and the center line of the main grid line of the adjacent middle grid line substructure is larger than the distance between the center lines of the main grid lines of any two adjacent middle grid line substructures. The distance between the center line of the main grid line of the second edge grid line substructure and the center line of the main grid line of the adjacent middle grid line substructure is larger than the distance between the center lines of any two adjacent middle grid line substructures. The back contact solar cell solves the problem of damage caused by stress concentration at the edge of the cell.

The invention discloses a mass concrete composite anti-crack structure and a crack control construction method based on the mass concrete composite anti-crack structure. The composite anti-crack structure comprises a core common concrete layer, an outer side anti-crack concrete layer, a reinforcing mesh arranged between the core common concrete layer and the outer side anti-crack concrete layer, and a top anti-crack concrete layer. The method comprises the steps that firstly, the thickness of side face anti-crack concrete and the thickness of top face anti-crack concrete needing to be poured are calculated according to cracking risk assessment, the side face anti-crack concrete is poured firstly, then core common concrete is poured, and it is ensured that the pouring height of the side face concrete is always 20-30 cm higher than the core common concrete; and then the top surface is completely constructed by adopting anti-crack concrete. The reinforcing mesh subjected to special treatment is adopted, so that the overall stress of the composite structure is uniform, the overall anti-cracking performance and durability of the composite structure are improved through the outer side anti-cracking concrete, the construction technology is simple, meanwhile, a large amount of construction cost and operation and maintenance cost can be saved, and the composite structure is suitable for application and popularization.

The invention provides a structure capable of controlling a large-volume water gate crack and a construction method thereof, and belongs to the technical field of water gates. The structure comprises a gate bottom plate and a gate pier which are formed by pouring concrete, and the gate pier is arranged above the gate bottom plate; hole cavities are at least formed in the gate piers and reserved in the concrete pouring process. The hole cavity is used as a self-constrained stress hole; and the tough material is used for absorbing stress, is filled in the pore cavity and is connected with the inner wall of the pore cavity. The method comprises the steps of S1, construction preparation; s2, foundation treatment; s3, gate bottom plate construction; s4, gate pier construction: S41, construction lofting; s42, gate pier reinforcing steel bars are bound and installed; s43, a gate pier formwork is erected above the gate bottom plate; s44, a hole forming device is installed at the designed position; s45, concrete pouring, vibrating and curing are conducted; and S46, after initial setting of the concrete, the hole forming device is pulled out of the pipe, and a formed hole cavity is filled with a tough material. The sluice pier crack can be effectively controlled, and the use durability and safety of the sluice are improved.

The invention relates to the technical field of pressure testing equipment for concrete slabs, in particular to a pressure testing machine for a concrete slab doped with a concrete admixture. The device comprises a rack, a loading mechanism, a sample clamp, a flatness detection device, a grinding device and a measurement and control system. Wherein the loading mechanism drives a loading head to vertically move through a lifting source, the sample clamp is used for clamping a sample, the flatness detection device drives a first flatness detector through a two-dimensional moving assembly to detect the flatness of the surface of the sample, and the polishing device drives a polisher through a three-dimensional moving mechanism to polish the surface of the sample. The measurement and control system is used for collecting and recording test data and controlling actions of all parts. According to the invention, comprehensive and accurate pressure test and flatness detection on the concrete plate doped with the concrete admixture are realized, and the test efficiency and accuracy are improved.

The invention discloses a method for enhancing the interface performance of a carbon fiber composite coating through two-step chemical reaction synergistic modification, modified carbon fibers and application. The method comprises the following steps: carrying out silanization modification treatment and hyperbranched modification treatment on carbon fibers subjected to oxidation treatment to prepare the modified carbon fibers. The method for enhancing the interface performance of the carbon fiber composite coating through two-step chemical reaction synergistic modification is suitable for improving the interface performance of the carbon fiber composite coating, and the prepared modified carbon fiber is mixed with resin and a curing agent and cured; the obtained carbon fiber reinforced composite coating has excellent mechanical properties, wear resistance and erosive wear resistance, and can effectively reduce damages such as corrosion, erosive wear and the like of complex and harsh marine environments such as a spray splashing area and the like to steel structure facilities.

The polishing head comprises a shell, a carrier, a retaining ring and an elastic film assembly, the shell is used for being connected to the lower portion of a rotary driving part, the carrier is connected to the lower portion of the shell and provided with a containing cavity with a downward opening, the retaining ring is connected to the lower end face of the carrier, and the elastic film assembly is connected to the lower end face of the carrier. The elastic membrane assembly is arranged in the containing cavity, a buffering cushion ring is arranged at the bottom of the elastic membrane assembly, and the buffering cushion ring is arranged close to the outer ring of the elastic membrane assembly. According to the polishing head for the square silicon wafer, the incircle area of the square silicon wafer is ground through the middle area of the elastic film assembly, meanwhile, the buffering cushion ring close to the outer ring of the elastic film assembly abuts against the upper portion of the corner area of the square silicon wafer, effective buffering on the corner area is formed, and the polishing effect is improved. The problem that stress concentration is generated in the corner area in the grinding process is avoided, the grinding structure of the corner area is optimized, synchronous grinding of the inscribed circle area and the corner area is achieved, and the grinding quality of the square silicon wafer is guaranteed.

The invention relates to the technical field of cable performance detection, and particularly provides a cable tensile property testing device. Comprising a test bench, the test bench is provided with a cable fixing frame, and the test bench is provided with a force application assembly used for applying a vertically downward traction force; and a plurality of stretching execution mechanisms for carrying out stretching tests on the plurality of cables are fixed on the force application assembly. According to the device provided by the invention, a mode that multiple cables in the same batch and multiple test stations uniformly apply force is adopted, accidental random errors of testing are greatly reduced, flexible fitting, pressing and stretching are carried out on the cables through the stretching execution mechanism, the uniformity of stress distribution is improved, stress concentration is avoided, and the testing efficiency is improved. An anti-tilting clamping design is adopted, so that the uniformity of the test direction is enhanced; besides, the electrical performance test can be synchronously carried out while the structural performance test is carried out in the bending and stretching process, so that the test comprehensiveness is ensured.

The utility model relates to a battery, a battery pack and electric equipment, the battery has a length L, a thickness D, a height H and a volume V, and L is greater than D, L is greater than H, and L is greater than or equal to 300mm and less than or equal to 2000mm; the battery comprises at least one anti-explosion valve, the anti-explosion valve is arranged on the side face adjacent to the large face of the battery, the distance between the edge, close to the large face, of the anti-explosion valve and the large face is D1, and the requirement that D1 is larger than or equal to 1 mm is met; the area S and the volume V of the anti-explosion valve meet the relational expression V: S = 1500-8000 (mm). D1 is larger than or equal to 1 mm, stress borne by the anti-explosion valve due to large-area expansion can be reduced, and the reliability of the anti-explosion valve is improved; the lower limit value of S can ensure that the explosion-proof valve can quickly discharge high-temperature and high-pressure gas-liquid substances in the battery when the battery is subjected to thermal failure; the upper limit of S is used for solving the problems that the valve element of the anti-explosion valve is not easy to reach the opening threshold value due to the fact that the area of the anti-explosion valve is too large, the opening error is large, and the anti-explosion valve cannot be opened in time.

The invention discloses a device and a method for quenching and tempering glass, and relates to the technical field of glass tempering. The tempering device comprises a tempering table, wherein a tempering mechanism and an adjusting mechanism are arranged in the tempering table; the tempering mechanism comprises two groups of limiting plates fixedly mounted between the inner walls of the tempering table, the limiting plates are symmetrically arranged, a cooling box is arranged below the limiting plates, and a plurality of groups of cooling openings are fixedly formed in the bottom of the cooling box. The distance between the cooling openings and the cooling time can be automatically adjusted according to the width degree of the glass, the wide glass is usually thick or large in area, when the distance between the cooling openings is increased, cooling air flow can more evenly cover the surface of the glass, the situation that too strong air flow is concentrated in a certain part, and consequently local temperature is suddenly lowered is avoided, and the service life of the glass is prolonged. Therefore, the phenomenon of local supercooling or superheating is reduced, and the situation that part of the surface of the glass cannot be in contact with cooling air when the glass is too wide is prevented.

The utility model discloses a novel soup ladle polishing system which comprises a plurality of polishing devices arranged in sequence. A first turnover device, a workpiece exchange device and a second turnover device are sequentially arranged on one side of the polishing device; and the first turnover device, the workpiece exchange device and the second turnover device are adjacently provided with spoon head adsorption rotating devices. According to the novel soup ladle polishing system disclosed by the utility model, in the polishing process, the concave surface of the spoon head is adsorbed or the concave surface of the spoon head is used for polishing and transferring; the problem of stress concentration at the welding seam when a clamping handle is used for polishing is avoided, and the product quality is guaranteed.

The invention discloses a flexible silicon wafer and a preparation method thereof, and a flexible solar cell prepared by using the flexible silicon wafer. The preparation method of the flexible silicon wafer comprises the following steps: polishing the front surface and the back surface of the silicon wafer by adopting a polishing solution; depositing a thick dielectric film on the back area of the silicon wafer by adopting an ALD (Atomic Layer Deposition) method or a PECVD (Plasma Enhanced Chemical Vapor Deposition) method, plating the thick dielectric film on the side area and the front edge area of the silicon wafer in a winding manner, and forming a thin dielectric film on a transition area between the thick dielectric film on the front edge area of the silicon wafer and a middle non-mask area; and texturing the middle area of the silicon wafer and the transition area covered by the thin dielectric film by adopting an alkaline solution, then removing the thick dielectric film in other areas by adopting an HF-containing acidic solution, and cleaning the silicon wafer. According to the method, the bending strength of the silicon wafer can be improved, the flexibility of the HJT battery is improved, and the application range of the thin HJT battery is expanded.

The invention relates to the technical field of automatic assembly, in particular to an automatic gluing, infinite lengthening and assembly device and method for bamboo wood. The device comprises a first supporting frame, a pushing mechanism is arranged at one end of the first supporting frame, a baffle is fixedly connected to one end of a partition plate, and a pressing mechanism is arranged in the middle of the first supporting frame; the first supporting frame and the fourth supporting frame are arranged on the base and used for pressing materials downwards, a power gluing mechanism is arranged at one end of the first supporting frame and used for providing power for material movement and conducting gluing work on the materials, and a clamping and bundling mechanism is arranged at the top end of the fourth supporting frame and used for clamping and bundling the materials. The device performs blank assembling and lengthening work on bamboo boards in a full-automatic mode, is not only suitable for bamboo canes, but also suitable for bamboo wood recombination units such as bamboo flattened plates with narrow breadth, effectively reduces the labor cost of factories, can realize preparation of bamboo laminated wood with various lengths according to needs, and can recover redundant glue liquid in continuous equipment, so that the production efficiency is improved, and the production cost is reduced. The glue solution utilization rate is improved.

The invention provides a display panel and a display device. The display panel comprises a substrate, a packaging layer and a touch control layer, wherein the packaging layer and the touch control layer are sequentially arranged on the substrate in a stacked mode; the substrate comprises a hole opening area and an isolation area surrounding the hole opening area; the touch layer is provided with at least one slot, the slot is located in the isolation area, the slot extends from the surface, away from the substrate, of the touch layer to the direction of the substrate, and the slot penetrates to the surface, away from the substrate, of the packaging layer to the maximum extent. According to the display panel, the structure of the touch layer of the isolation area is not continuous, stress is dispersed, stress concentration is avoided, then the problem that in the manufacturing process of the display panel, due to stress concentration, a film layer is peeled off or cracks appear is solved to a certain extent, the display effect of the display panel is guaranteed, and the display effect of the display panel is improved. And the yield and the product competitiveness of the display panel are improved.

The invention discloses a method for improving the strength and long-term service performance of a brazed joint in a skutterudite thermoelectric device by using a cobalt-based barrier layer, and belongs to the technical field of thermoelectric material connection. The problems that the long-term service performance of existing skutterudite and electrode brazing is poor, and the strength of a brazed joint is low are solved. The cobalt-based barrier layer added between the skutterudite and the electrode is cobalt and the refractory metal, and the refractory metal is high in melting point, bond energy and diffusion activation energy, so that diffusion of the Sb element through the barrier layer to the electrode is inhibited, and the components of the cobalt-based barrier layer can be flexibly adjusted, so that the thermal expansion coefficient of the barrier layer is easily matched with that of the skutterudite. The barrier layer powder and the skutterudite powder are subjected to integrated hot pressed sintering, and staggered interfaces are formed between the powder and the powder; and the interface stress can be well relieved. Due to the fact that the barrier layer contains fewer grain boundaries, diffusion of the Sb element can be better restrained. The shearing strength of the obtained brazed joint of skutterudite and the electrode reaches 33.6 MPa.

The invention discloses an ultralow-temperature-resistant hydrogenated butadiene-acrylonitrile rubber tube rubber material and a preparation method thereof, and belongs to the technical field of butadiene-acrylonitrile rubber production. The ultralow-temperature-resistant hydrogenated butadiene-acrylonitrile rubber tube rubber material provided by the invention comprises the following raw materials in parts by mass: 100 parts of hydrogenated butadiene-acrylonitrile rubber, 65-80 parts of carbon black, 2-5 parts of zinc oxide, 1-2 parts of stearic acid, 8-12 parts of a low-temperature-resistant plasticizer, 1-3 parts of a vulcanizing agent, 1-2 parts of an accelerant and 2-5 parts of an anti-aging agent. The preparation method of the ultralow-temperature-resistant hydrogenated butadiene-acrylonitrile rubber tube rubber material comprises the following steps: adding hydrogenated butadiene-acrylonitrile rubber into an internal mixer, sequentially adding carbon black, zinc oxide, stearic acid and a low-temperature-resistant plasticizer, and continuously mixing for 4-5 minutes to obtain the rubber material; transferring the rubber material to an open mill, and adding a vulcanizing agent, an accelerant and an anti-aging agent to obtain a rubber compound; and vulcanizing the rubber compound, taking out the rubber material after vulcanization, and naturally cooling to room temperature to obtain the ultralow-temperature-resistant hydrogenated nitrile rubber tube rubber material.

The invention provides a cross-core pull rod composite frame large-span glass curtain wall construction method, belongs to the technical field of glass curtain wall construction, and mainly comprises two links of manufacturing and mounting. In the manufacturing link, the right-angle flat-section rectangular pipe is manufactured by adopting a cold and hot extrusion process, and the required component is obtained through annealing, cold extrusion forming and local hot extrusion treatment. The installation link comprises the following steps: firstly, carrying out construction deepening design on a pull rod system, decomposing a cross-core pull rod into inter-section pull rods, and determining a pre-arching value of the cross beam through simulation analysis; then on-site construction is conducted, and the steps of installation and adjustment of stand columns, hoisting and positioning of large-span cross beams, assembly and connection of internode pull rods, installation and welding of midspan davits and the like are sequentially completed. And finally, a #-shaped tensioning tool is adopted for tensioning the pull rod system, and installation of the glass panel and the decoration system is completed, so that the construction quality and the structural safety of the large-span glass curtain wall system are ensured, and the technical problems that a traditional method excessively depends on artificial experience, and scientific theoretical guidance and accurate control means are lacked are solved.

The embodiment of the invention provides a polishing head, polishing equipment, a polishing method, a processor and a storage medium. Wherein the polishing head comprises: a base; the retaining ring is arranged below the base; the polishing head gas film is arranged on the base, is arranged on the inner side of the retaining ring and is used for fixedly holding the wafer; the retaining ring gas film is arranged on the inner side of the retaining ring and is arranged between the retaining ring and the polishing head gas film, the retaining ring gas film is in contact with the edge of the wafer when the retaining ring gas film is pressurized and expanded so as to apply acting force to the edge of the wafer, and the acting force forms radial clamping force and axial downward pressure on the edge of the wafer. Radial clamping force and axial downward pressure are applied to the edge of the wafer through the retaining ring gas film, the wafer can be clamped through the radial clamping force, the wafer is prevented from moving in the polishing process, and the risk of wafer sliding is reduced; the axial downward pressure can apply pressing force to the edge of the wafer in the wafer polishing process, the polishing effect of the edge of the wafer can be controlled more accurately, and the polishing consistency of the surface of the whole wafer is guaranteed.

The invention relates to the technical field of bridge construction, in particular to a method for erecting a main cable of a space cable self-anchored suspension bridge by means of main cable saddle splitting displacement, which comprises the following steps: splitting a main cable saddle; two parts of a main cable saddle are erected on the top of the bridge tower at intervals, and a pushing device is arranged; catwalk construction is conducted, and the two catwalks are arranged in parallel; main cable construction is conducted, the two main cables are arranged in parallel, and temporary buckle cables are arranged between the main beams and the main cables; active cross braces are installed between the parallel main cables, and the main cables and the catwalk are opened through the active cross braces; the pushing device is used for folding the two parts of the main cable saddle, and combination of the main cable saddle and conversion of the main cable from a plane system to a space system are completed; according to the space cable self-anchored suspension bridge main cable erecting method utilizing main cable saddle splitting and displacement, the situation that enough distance is not reserved when parallel catwalks are erected can be avoided, and the problems that space is limited and operation is inconvenient are solved.

The utility model discloses a side-mounted garbage collection and transportation manipulator which comprises a grabbing mechanism, a lifting mechanism, a transverse position adjusting mechanism, a telescopic mechanism, a visual auxiliary operation mechanism and a control mechanism. The grabbing mechanism is provided with a single-finger clamping jaw and a double-finger clamping jaw which can be adjusted independently or simultaneously, and the single-finger clamping jaw is located in a gap in the middle of the double-finger clamping jaw. A sensor is arranged on the tail end clamping jaw; the lifting mechanism drives the grabbing mechanism and the transverse position adjusting mechanism to ascend and descend, and overturning and dumping of the dustbin are achieved. The transverse position adjusting mechanism is used for adjusting the position of the grabbing mechanism in the transverse direction; the telescopic mechanism is used for driving the supporting and lifting mechanism to stretch forwards or retract backwards, and the visual auxiliary operating mechanism obtains an image at the grabbing mechanism and conveys the image to the control mechanism; and the control mechanism is provided with a controller for controlling other parts to work. The grabbing mechanism is controlled to be opened and closed more accurately, and the garbage can is prevented from being shrunken by clamping or falling off in the grabbing process; and the adjustment in the lifting or horizontal direction is more accurate.

The invention relates to the field of metal material casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT800-5, which comprises the following steps: preparing pig iron, waste steel and foundry returns, and using auxiliary materials such as a silicon carbide pretreating agent, a high-temperature graphitization carburant, a rare earth magnesium silicon iron nodulizing agent, a silicon barium nucleating agent and a silicon strontium nucleating agent to prepare the green sand as-cast high-plasticity nodular cast iron QT800-5. The purity and component stability of molten iron are ensured; in the smelting process, purification and adjustment are carried out through temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microscopic structure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation; the final casting has excellent mechanical properties including the tensile strength larger than or equal to 800 MPa, the yield strength larger than or equal to 480 MPa, the elongation larger than or equal to 5% and the matrix pearlite content larger than or equal to 80%. The production process disclosed by the invention is simplified, is suitable for large-scale industrial production, and has a wide application prospect in lightweight application requiring high-strength and high-plasticity materials.

The invention discloses a conveying device for a hollow glass production line, and relates to the technical field of hollow glass production line conveying, the conveying device comprises a fixing plate, the top of the fixing plate is rotatably connected with a connecting rod, one end, away from the fixing plate, of the connecting rod is rotatably connected with a plurality of square plates, and the plurality of square plates are uniformly arranged on the outer side of a frame body; the two ends of the connecting rod are rotationally connected with the staggered fixing plate and the square plate, the top of the connecting rod is rotationally connected with a middle rod, the middle of the connecting rod is rotationally connected with a rotating rod, the side, close to the rotating rod, of the fixing plate is fixedly connected with a middle plate, and the inside of the outer side of the fixing plate is rotationally connected with a guide roller. According to the conveying device for the hollow glass production line, the distance between the guide rollers can be adjusted according to the size of fixed glass, glass supporting and positioning of equipment in the conveying process are improved, the conveying efficiency of the glass can be improved, shaking and deviation of the glass in the conveying process can be reduced, and therefore the production quality is improved.

The invention provides a method for preparing austenite aging steel based on injection molding, and belongs to the technical field of steel materials. The modified raw materials such as the sulfur-carbon-molybdenum composite powder, the nitrogen-nickel composite powder and the boron-phosphorus-chromium composite powder are matched with the components such as the silicon powder, the manganese powder and the iron powder, the austenite aging steel is obtained through injection molding, the density of the austenite aging steel material is improved, and meanwhile the mechanical property and hardness of the austenite aging steel material are improved.

The invention discloses a damping unit, a shoe sole and a design method thereof, and relates to the technical field of shoe sole damping, a quasi-zero stiffness module comprises two cross arms and four inclined arms which are symmetrically arranged up and down, two energy storage arms are arranged between the two cross arms, two ends of the two energy storage arms are fixedly connected with the inner sides of two ends of the two cross arms respectively, and the two ends of the two energy storage arms are fixedly connected with the inner sides of two ends of the two cross arms respectively. The two energy storage arms are arranged in an X shape; the bistable module comprises a convex module and a concave module which are symmetrically arranged on the two sides of the quasi-zero stiffness module, the convex module comprises a first connecting arm and a convex block arranged in the middle of the bottom of the first connecting arm, and one end of the first connecting arm is fixedly connected with the joint of the two oblique arms; the concave module comprises a second connecting arm and a concave block arranged in the middle of the top of the second connecting arm, and the convex block is matched with the concave block in an embedded mode. The quasi-zero stiffness module is used for reducing sole vibration during movement, and the bistable module is used for storing mechanical impact energy for impacting large deformation, so that a wearer is protected from being injured by sudden impact.

The utility model belongs to the technical field of well drilling and workover fishing equipment, and discloses a slip fishing socket. The slip fishing barrel comprises an outer barrel body and a fishing slip located in the outer barrel body, relative displacement is formed between outer spiral sawteeth of the fishing slip and corresponding teeth in the outer barrel body, a first top cutting face is formed at the tail of the outer spiral sawteeth of the fishing slip, and a second top cutting face is formed at the tail of the first top cutting face. And a second top cutting surface is formed at the root part of a tooth corresponding to the outer spiral sawteeth in the outer cylinder body. According to the slip fishing socket, fishes of different specifications and some severely-deformed fishes can be fished, meanwhile, the inventory of blue tiles and spiral tiles is reduced, the number of times of tripping is reduced, and therefore the working efficiency is improved.

The invention discloses an elevator guide rail installation and calibration device and method.The device comprises a quadrilateral structure composed of a wall supporting mechanism and a calibration mechanism, the wall supporting mechanism comprises a second linear module, and the second linear module is hinged to two first linear modules; the calibration mechanism comprises a mounting frame; the second linear module is hinged to the two first linear modules, and the two first linear modules are hinged to the mounting frame, so that the second linear module and the mounting frame form a quadrilateral structure, and the wall supporting mechanism and the calibration mechanism form the quadrilateral structure. The labor intensity of operators can be relieved, the installation period is shortened, the installation precision of the guide rail is remarkably improved, and high-speed, stable and safe operation of an elevator is guaranteed; the problem of stress concentration caused by clamping the guide rail by a hard-connected calibration device is avoided, stress concentration generated during clamping of the structure can be released, structural deformation generated by the calibration device in the assembling process is relieved, the parallelism requirement of guide rail calibration can be met, and the calibration precision is high.

The invention relates to the field of GRP pipeline pressure testing, in particular to a large-diameter GRP pipeline pressure testing method, which comprises the following steps of S1, performing preparation work before pressure testing; s2, a pre-hydrostatic test: carrying out segmented pressurization on the pipeline to be subjected to pressure test; s2, checking whether the pipeline to be subjected to pressure test leaks or not, if leakage occurs, repeating S2 after overhauling, and if leakage does not occur, continuing pressurizing to test pressure; s3, main hydrostatic test: after reaching the test pressure, maintaining the pressure for 30-35 minutes, reducing the pressure to the working pressure if the pressure drop is less than or equal to 0.02 MPa during the pressure maintaining period, and maintaining the pressure for 30-35 minutes; checking whether the pipeline to be subjected to pressure test leaks or not, and if yes, repeating the steps S2-S3 after overhauling; if no leakage exists, the main hydrostatic test is ended; and S4, discharging water and releasing pressure, and dismounting the temporary pressure test system. According to the pressure testing method, the characteristics of the material of the GRP pipeline are comprehensively considered, and the problems that in a traditional pressure testing method, the GRP pipeline is prone to being damaged due to too fast pressure loading and the construction period is prone to being affected due to too slow pressure loading are effectively solved in a segmented pressurization and multi-stage pressure maintaining mode.

The invention relates to the technical field of high polymer materials, and particularly discloses a PPHM corrugated pipe and a preparation method thereof. The PPHM corrugated pipe is prepared from 100 parts by mass of polypropylene resin, 4-10 parts by mass of mica sheets, 7-12 parts by mass of carbon fibers, 10-15 parts by mass of a compatilizer, 5-15 parts by mass of a low-temperature-resistant agent and 0.8-1 part by mass of an antioxidant. The mica sheets are modified mica sheets, and the carbon fibers are modified carbon fibers; the low-temperature-resistant agent is at least one of an ethylene-vinyl acetate copolymer and a styrene-butadiene-styrene block copolymer. The PPHM corrugated pipe prepared by the invention has relatively good ring stiffness, tensile property and impact resistance at low temperature.

The utility model discloses a roller end shaft sleeve with long service life. The roller end shaft sleeve comprises a shaft sleeve body, two symmetrically arranged lining plates and a fastener, an inner hole of the cross section of the shaft sleeve body is formed by mutually connecting two sections of arc surfaces which are symmetrical front and back and two sections of non-right-angle lining plate grooves which are symmetrical up and down; the non-right-angle lining plate groove is of a symmetrical structure and is formed by sequentially connecting a key groove, a plane, a fillet and an inclined face from the middle to the outside. The lining plate is of a symmetrical structure, the protruding portion of the lining plate is embedded into the key groove, the shoulder portion is attached to the plane, and gaps exist between the side face and the fillet and the inclined face. The arc surface and the non-right-angle lining plate groove are in fillet transition; the fastener is connected with the shaft sleeve body and the lining plate. By optimizing the lining plate groove structure of the shaft sleeve body, the stress concentration of the shaft sleeve is effectively reduced, and the service life of the shaft sleeve is prolonged.

The invention belongs to the field of roadway support utilization, and particularly relates to a method for improving the bearing capacity of two sides by converting stress of the two sides into surrounding rock of the two sides. The core is that the vertical pressure of the top plate is transferred to the horizontal direction of the two sides, the confining pressure of the two sides is increased, and the bearing capacity of the coal rock mass is increased, so that the bearing capacity of the two sides is improved, the roadway stability is improved, and surrounding rock deformation is controlled. According to the method, U-shaped steel is used as a whole, three-section splicing is adopted, the U-shaped steel support is high in strength and stability and meanwhile has the advantages of being convenient to carry and operate, the junction is connected and fixed through a hoop, the sliding pressure relief effect can be achieved, and the safety of roadway supporting is guaranteed. Anchor cable channel steel is used for reinforcing and stabilizing the support, high-strength slotted steel pipes are driven outside anchor cable drill holes in the two sides to reduce shearing force borne by anchor cables, the support is more stable, the channel steel is arranged in the axial direction of a roadway, point stress of the sides is conveniently changed into face stress, the roadway sides can be stabilized in a larger range, and local point stress concentration is avoided.