35results about How to "Avoid softening" patented technology

The invention provides a construction method of a prefabricated assembled roadbed structure of a new and old expressway, which comprises the following steps: S1, carrying out stepped excavation on an old roadbed splicing area, and connecting a plurality of first splicing units with an old roadbed through a longitudinal insertion structure; s2, the first splicing units and the second splicing units are connected through first bolt connecting sets, and the second splicing units are connected through transverse inserting structures; s3, the adjacent first splicing units and the connected second splicing units are connected through second bolt connecting sets; s4, the first splicing unit and the second splicing unit are each connected with a leveling assembly used for adjusting the elevation and levelness of the first splicing unit and the second splicing unit; s5, sealing pieces are arranged between the first splicing units, between the first splicing units and the second splicing units and between the second splicing units; and S6, cast-in-place structures are arranged at the joints of all the splicing structures, the site cast-in-place workload is reduced, and rapid splicing of the new roadbed and the old roadbed is achieved.

This invention belongs to the field of foundation pit support technology, specifically relating to an adjustable foundation pit engineering support structure. It includes support units, each comprising a support base plate and a support frame plate. The support base plate rests against the foundation pit wall, and the support frame plate is connected to the support base plate via an adjustable support. A cross bracing device supports the support frame plates of two support units in opposite directions, and the two support units are mutually supported by the cross bracing device, with the adjustable support buffering the deformation pressure of the foundation pit wall. Support units in the same direction are spliced ​​together. This invention provides an adjustable foundation pit engineering support structure, employing an adjustable support structure that forms a recoverable elastic support system between the support base plate and the support frame plate. After pressure is unloaded, it can return to its original shape, improving the durability and reusability of the support structure.

The utility model discloses a kind of high-temperature-resistant sponges, including sponge body and boss;The top of the sponge body is provided with boss, one side of the sponge body is fixed with clamping groove, the other side of the sponge body is fixed with clamping block, sponge body includes aluminium oxide, metal net and silicon dioxide.The utility model is provided with metal net, the middle position of sponge body is provided with metal net, metal net can improve the mechanical strength and high-temperature-resistant performance of sponge, reduce the possibility of deformation, and the inside sea of sponge body is respectively provided with aluminium oxide and silicon dioxide, aluminium oxide and silicon dioxide can all promote the heat resistance of sponge body, while silicon dioxide can also strengthen the hardness and wear resistance of sponge, and aluminium oxide can improve the toughness of sponge, so that the high-temperature-resistant performance of sponge is strengthened, avoid its soft under high-temperature state, or temperature difference leads to crack or fracture, prolong the service life of sponge.

The application discloses a high-silica glass fiber heat insulation cotton for automobiles and a preparation method thereof, and relates to the technical field of sound and heat insulation. The high-silica glass fiber is used as raw material, and the high-silica glass fiber has higher high-temperature resistance and high-temperature stability than conventional glass fibers, can maintain high mechanical strength for a long time, and avoids softening under high temperature. The phenolic resin is modified, a boron-silicon modified polyphenol monomer containing phenolic hydroxyl groups and boron and silicon elements is prepared, and participates in the condensation reaction of the phenolic resin, so that the phenolic resin has higher high-temperature resistance and flame retardance, and the glass fiber heat insulation cotton has higher safety performance.

This invention relates to the field of high-performance steel heat treatment equipment technology, and discloses a heat treatment method for eliminating anisotropy in stamped parts, comprising five stages: pretreatment, gradient temperature-controlled annealing, magnetic field-assisted regulation, integrated cooling, and post-treatment. This invention innovatively employs thickness-layered gradient temperature control, pulsed magnetic field-assisted grain boundary regulation, a micron-level high-precision temperature control system, and integrated closed-loop control of annealing and cooling to achieve precise control of the microstructure: the average grain size of the steel is ≤2μm, grain uniformity is ≥92%, tensile strength is ≥1200MPa / 950MPa, elongation is ≥25%, and the strength-ductility matching coefficient is improved by more than 40% compared to traditional processes; process repeatability error is ≤3%, microstructure recovery and softening rate is ≤5%, and residual stress elimination rate is ≥95%; achieving synergistic optimization of strength and ductility, it can be widely applied in high-end equipment manufacturing fields such as aerospace, nuclear fusion devices, and extreme cold environment engineering.

The utility model discloses an engine connecting rod convenient to disassemble and assemble, which belongs to the technical field of engine connecting rods and comprises a rod body and a connecting rod big end, the connecting rod big end is fixedly mounted at one end of the rod body, connecting rod covers are symmetrically mounted on two sides of the connecting rod big end, fixing cylinders are slidably mounted in the connecting rod covers, and fixing rods are fixedly mounted in the fixing cylinders. One end of the fixing rod is connected with a handle, telescopic sleeves are symmetrically arranged at the other end of the fixing rod, springs are arranged in the telescopic sleeves, and the other ends of the springs are connected with guide columns. According to the engine connecting rod convenient to disassemble and assemble, the disassembling time can be shortened, by rotating the handle, the fixing rod in the fixing barrel can stretch the spring and the telescopic sleeve to stretch out and draw back together, a positioning pin on the connecting rod cover is pulled out, rapid disassembling is achieved, and during assembling, the handle is rotated, the spring is stretched and aligned with a groove to be inserted, the spring pushes the telescopic sleeve to stretch out, and assembling is completed. The positioning pin is inserted, locking is achieved, and the rod body can be prevented from loosening under high-frequency vibration through locking combination of the spring and the positioning pin.

The application belongs to the technical field of adhesives, and relates to a temporary bonding support material and a preparation method and application thereof. The temporary bonding support material is obtained by polymerization of a cyclic olefin monomer or polymerization of a cyclic olefin monomer and an olefin monomer. The cyclic olefin monomer has a structure shown in formula I, and the olefin monomer has a structure shown in formula II. The obtained cyclic olefin polymer obtained by polymerization of the specific monomers is selected as the main component of the temporary bonding support material. The rigid cyclic structure contained in the main chain of the cyclic olefin polymer can effectively limit the chain segment movement. The saturated carbon hydrogen main chain contained in the cyclic olefin polymer has a hydrophobic nature and a dense amorphous structure which can block the penetration of water molecules. The obtained temporary bonding support material has the characteristics of high modulus and high glass transition temperature at high temperature, and also has excellent water vapor resistance.

The invention relates to the technical field of medial strips, and discloses a water diversion structure used for a road medial strip and capable of being rapidly constructed, the water diversion structure comprises a plurality of splicing units, and the splicing units are in butt joint in sequence to form a covering structure; each assembly unit comprises two water baffles, the inner ends of the water baffles form butt joint ends, the outer ends of the water baffles form fixed ends, hollow areas are formed in the middle portions of the water baffles, and the fixed ends are fixedly arranged. The water baffle is provided with a water guide face, and a water guide channel is arranged on the water guide face. A plurality of splicing units are in butt joint in sequence to form a covering structure covering the medial strip, and the advantage of rapid construction is achieved; rainwater falls on the water baffle, flows along the water guide surface and is drained to the road surface by the water guide channel, so that excessive rainwater is prevented from permeating into the roadbed, the roadbed is prevented from being softened and the like, and the service life of the road is prolonged.

The application discloses a manufacturing method of a high-heat-dissipation-efficiency pouring type driving transformer, and belongs to the technical field of power electronic equipment manufacturing. The method aims to solve the technical problems of low heat dissipation efficiency and insufficient long-term reliability of the existing driving transformer caused by the limited heat conduction performance of the pouring material, the simple surface heat dissipation structure and the difficult coordination of internal thermal stress. The method comprises the following steps: constructing a three-dimensional digital model of a reinforced heat dissipation structure with a boss array and a groove array and preparing a corresponding forming die; positioning a magnetic core and a winding as an insert in a die cavity; pouring insulating colloid with different mechanical and heat conduction properties in batches in a vacuum environment; through a segmented curing process, the flexible colloid is fully filled in the internal gap and buffers the stress, and at the same time, the high-heat-conduction rigid colloid forms an external main body and a heat dissipation structure, thereby forming an integrated pouring body. The method is used for manufacturing the driving transformer suitable for high-power-density and high-heat-dissipation scenes, and can significantly improve the heat dissipation capacity and operation reliability of the driving transformer.

The present invention addresses the problem of obtaining a powdery chocolate composition which, when added to chocolate, exhibits excellent dispersibility, suppresses chocolate softening, and improves chocolate flavor physical properties, and which exhibits excellent dispersibility as a chocolate powder beverage and excellent flavor as a chocolate beverage. Provided is a method for producing a powdered chocolate composition that satisfies the technical problem by dispersing raw materials satisfying the conditions (A)-(D) in water to obtain an oil-in-water emulsion having an average emulsion particle diameter of 1.5-10 [mu] m (inclusive), and drying the oil-in-water emulsion. (A) The grease is contained in an amount of 110% by mass or less relative to the fat-free cocoa solid content. (B) A cocoa-derived raw material is contained in an amount of 30% by mass or more relative to the solid content of the composition. (C) The composition contains 15 mass% or more of an oil or fat relative to the solid content of the composition. And (D) a raw material derived from milk in an amount of 0.5% by mass or less relative to the solid content of the composition.

The utility model relates to cooling device technical field especially relates to a cooling device for pig feed antibacterial granule production, including base, the base installs drive mechanism on, drive mechanism drive connection has the air duct that guides, the air duct's axial both ends are equipped with the opening that penetrates, the both ends of air duct rotatory connection have first casing and second casing respectively. The utility model discloses through setting up by drive mechanism drive rotating air duct, and setting up axial fan in the axial both ends of air duct, for forming the cold air flow that flows fast in the air duct, cooperation inside spiral plate makes feed granule in the while along the axial delivery of turning over to contact with cold air flow fully, improves the cooling efficiency and cooling uniformity of feed granule, sets up filter hole in the air duct simultaneously, sets up cover and recovery subassembly outside the filter hole of air duct for separating out condensate in time, avoids the feed granule in the air duct in the process of turning over and overabsorption condensate and leads to softening.

The invention relates to the technical field of pet food processing, and particularly provides a protein-lipid compound oil gel coating composition which comprises the following components in parts by weight: 60-70 parts of egg yolk oil; 10 to 20 parts of eggshell membrane peptide; 5-10 parts of medium-chain fatty acid; 0.1 to 0.5 part of vitamin E; 10 to 15 parts of ethyl cellulose; and 2-5 parts of nano silicon dioxide. Egg oil is used as a substrate, an oil gel three-dimensional network is constructed, eggshell membrane protein is integrated into lipid, and precise function delivery of joint and fur health is achieved. The solid coating is stable in structure and high in oxidation resistance, can be firmly attached to the surface of the pet food, effectively prevents grease oxidation and leakage, and remarkably prolongs the shelf life and improves the additional value of the product.

The application relates to a high-efficiency roughening milling head for a glass surface, which comprises a base body, a milling head and a vane wheel; the bottom end of the milling head is provided with a grinding ring, the milling head is provided with a horn-shaped water inlet end, a water storage area and a water flow channel, the vane wheel is arranged below the water storage area, the ratio of atomized water of the vane wheel can be reduced, the cooling water flow is improved, the outer side wall of the grinding ring is provided with a chip removal groove, the inner side wall is provided with a water passage, and the milling head is internally provided with a water flow channel; when the vane wheel transmits a torsion and rotates simultaneously with the milling head, the vane pushes the cooling water to the end face of the grinding ring, then the water is affected by the water passage and applied to the grinding area, and the outer cooling mode is changed into the inner cooling mode; the chip removal speed is improved through the densely arranged outer chip removal groove and the water passage; the problem that the roughness of the roughened glass surface is too low due to the high passivation rate of diamond caused by the grinding heat and the poor self-sharpening property of the milling head is solved through the water passage, the contact area with the glass is reduced, and the problem that the thin glass is softened or broken due to the excessively large applied pressure is avoided.

This application relates to a tunnel invert drainage system, comprising a longitudinal blind pipe at the tunnel bottom, a vertical blind pipe at the tunnel bottom, a circumferential blind pipe, a drainage layer, precast no-fines concrete blocks, a waterproof membrane, a transverse blind pipe, a back-adhesive waterstop, a centrally embedded waterstop, and a galvanized steel plate waterstop. The drainage layer includes self-adhesive fabric, a drainage membrane, and geotextile layered sequentially on the initial support surface; precast no-fines concrete blocks are placed on the longitudinal blind pipes of the low sidewall; the waterproof membrane wraps around the longitudinal blind pipes of the low sidewall and the precast no-fines concrete blocks; the transverse blind pipes are located on both sides of the circumferential construction joint, with drainage holes on both sides of the construction joint, the drainage holes communicating with the transverse blind pipes and the longitudinal blind pipes of the low sidewall; the back-adhesive waterstop is adhesively bonded to the waterproof membrane; the galvanized steel plate waterstop is fixed at the construction joint and adhesively bonded to the centrally embedded waterstop. This tunnel invert drainage system enables effective collection and efficient discharge of groundwater, thereby effectively reducing water pressure at the bottom of the invert.

This invention relates to an aluminum-based composite material, a robot arm, and a method for preparing the robot arm, belonging to the technical field of metal matrix composites and high-end equipment structural components. The aluminum-based composite material comprises an aluminum alloy matrix and silicon carbide particle reinforcement distributed within the aluminum alloy matrix. The chemical composition of the aluminum alloy matrix, by mass percentage, includes: Cu 3.0-6.0%, Mg 0.5-2.0%, Ag 0.1-1.0%, Zr 0.05-0.3%, Ti 0.01-0.2%, with the balance being Al and unavoidable impurities. The microstructure of the aluminum alloy matrix contains L12-Al3(Zr,Ti) nanophases and lath-like Al2Cu phases. The robot arm prepared using this aluminum-based composite material exhibits an axial tensile strength exceeding 320 MPa and an axial thermal conductivity exceeding 220 W / (m·K) at a high temperature of 300℃, achieving an integrated function of "load bearing and heat conduction." This invention effectively solves the problems of decreased accuracy and shortened lifespan of existing robot arms due to material softening and insufficient heat conduction at high temperatures, and has the advantages of lightweight, high reliability and low cost.

The invention relates to the technical field of material forming and processing equipment, in particular to a fire-fighting environment-friendly flame-retardant material forming and processing device which comprises a base and an extrusion barrel mounted on the base, a discharging barrel and a heater are mounted on the extrusion barrel, and a conveying screw driven by a motor A is mounted in the extrusion barrel; a closing assembly used for controlling the extrusion cylinder to be connected and disconnected is arranged below the discharging cylinder. The mixing mechanism is installed on the discharging barrel and comprises a rotating shaft driven by a motor B and a gear set, and a stirring assembly is arranged on the rotating shaft. Airflow blown out by a negative pressure fan can enter an air conveying pipe through a vertical pipe and then is evenly sprayed into the discharging barrel through a spray head which is obliquely and upwards arranged; and the input normal-temperature air is used for performing real-time temperature control on the plastic particles which are being stirred, so that the plastic particles are prevented from being softened and degraded due to heat generated by friction, and the original performance of the plastic particles is not influenced.

The utility model discloses a cleaning system which comprises a cleaning device, the cleaning device comprises a floor brush, the floor brush comprises a rolling brush and a scraping strip, and the scraping strip is arranged on the front side and / or the rear side of the rolling brush; the cleaning equipment selectively moves to the base station, a drying assembly is arranged in the base station, and the drying assembly is suitable for selectively performing drying work on the rolling brush after the cleaning equipment moves to the base station; wherein the scraping strip is configured to bear the drying temperature of 70 DEG C or above. Therefore, by arranging the cleaning system, the structural stability of the scraping strip can be kept in a high-temperature environment, the risk that the scraping strip is softened or deformed due to high temperature is avoided, and therefore it is guaranteed that the scraping strip and the cleaning face can be well attached for a long time, the water scraping effect of the scraping strip is guaranteed, and the cleaning reliability is improved.

The utility model relates to the technical field of slope retaining, and discloses an assembly type recoverable retaining wall device which comprises a positioning assembly, a retaining assembly, a greening assembly and a closing assembly, and the positioning assembly is made of reinforced concrete; the positioning assembly is placed on a concrete cushion layer; the positioning assembly comprises a wall toe and a clamping groove, and the clamping groove is rectangular; according to the retaining wall, the positioning assemblies, the wall toes, the clamping grooves, the soil retaining assemblies and the clamping pipes are arranged, the anti-sliding capacity of the foundation is remarkably enhanced through the design of the wall toes of the positioning assemblies, the clamping grooves and the clamping pipes of the soil retaining assemblies are fixedly connected in an embedded mode to form an overall stress system, the anti-overturning performance of the retaining wall is greatly improved, and through the stacked inserting design of the multiple layers of soil retaining assemblies, loads are transmitted through self weight; the structure stress distribution is optimized, the number of layers (such as 3-8 layers) of the soil retaining assemblies can be dynamically adjusted according to the height of the slope, the landform requirements of different engineering scenes are flexibly met, and the modularization adaptability is effectively improved.

The application discloses a kind of high-strength waterproof board and preparation method thereof, it is related to plate technical field.The preparation method of the application includes the following steps: sequentially stack 1 steel plate, 2 base plates, 1 fingerprint-resistant polymer film on 1 fingerprint-resistant polymer film, then heat pressing solidification, after cooling, plate is taken out, and high-strength waterproof board is obtained;Wherein, base plate is prepared from modified kraft paper and modified color paper.The water resistance, fire resistance and bonding strength of the plate are effectively improved by modifying kraft paper with modified phenolic resin, hydrophilic silicon dioxide and other components;The bonding strength, water resistance and fire resistance of the plate are further improved by modifying color paper with melamine, vanillin, flame retardant DOPO, 3,4-dihydroxybenzaldehyde and other components.Therefore, the application has a more extensive application prospect.

The utility model relates to the technical field of catering container, and disclose a kind of separate salad cup, including cup body and upper cover body, the cup body and upper cover body respectively have the chamber of different food materials, the cup body is connected with upper cover body by the connecting assembly of setting in the edge of both, the connecting assembly separates the chamber of both, forms independent space, the connecting assembly is locked with upper cover body by clamping, and locking forms stable anti -disengagement mechanism, the utility model is stored by the independent chamber of cup body and upper cover body, different food materials can be separated, avoid smell, soften, guarantee food material taste and quality, make upper cover body connection stable, anti -disengagement by connecting assembly, feedback has rotation operation, convenient to use, and upper cover and upper cover connecting piece are threadedly connected, good sealing and easy to disassemble and clean, wherein the folding spoon of setting is stored between connecting assembly and upper cover connecting piece, avoid pollution, folding design saves space.

The utility model relates to the technical field of food packaging equipment, and discloses a food packaging box with a corner protection structure, which comprises a packaging box body, the packaging box body is of a five-face edge frame structure with an open top, and the top of the outer side corner edge of the packaging box body is fixedly connected with a longitudinal support sheet and a magnetic support disc. The corner protection frame is movably arranged outside the packaging box body of the open food packaging box in a sleeving mode to provide support for the overall corners and the edges, so that the edges and the corners of the whole food packaging box are protected, the supporting strength of the packaging box is guaranteed, the situation that the packaging box becomes soft due to heating and oil and water is avoided, and the service life of the packaging box is prolonged. Meanwhile, the corner protection frames with certain rigidity and strength also guarantee the convenience of holding and avoid non-uniform touch force of holding, so that the containing of instant food for eating is greatly facilitated, better practicability is achieved, and the corner protection frames are made of plastics, so that the cost is lower, the economical efficiency is good, and wide application is facilitated.

This invention relates to the field of enameled wire production technology, and more particularly to an insulating varnish and enameled wire based on nanocomposite materials. The insulating varnish comprises the following components by weight percentage: polyester resin: 40-60%, amide-imide resin: 15-25%, xylene: 10-25%, N-methylpyrrolidone: 5-15%, nano-silica: 1.0-5.0%, nano-alumina: 0.5-2.0%, fluorinated surfactant: 0.5-2.5%, epoxy resin tackifier: 0.2-2.0%, antioxidant: 0.2-0.5%, and ultraviolet absorber: 0.1-0.5%. This invention significantly improves the mechanical strength, abrasion resistance, and heat resistance of the varnish layer by introducing nano-silica and nano-alumina; improves the wettability and adhesion of the varnish by adding fluorinated surfactant; and enhances the adhesion and durability of the varnish layer by using epoxy resin tackifier.

The utility model discloses a kind of heating air bag and massage device, heating air bag includes air bag main body and heating sheet, air bag main body forms the cavity of can accommodate gas;Heating sheet is located in the cavity of air bag main body, and heating sheet is equipped with conducting wire, conducting wire is sealingly connected to air bag main body, and the end of conducting wire away from heating sheet is located outside the air bag main body;The heating sheet at least in the air bag main body inflation state is attached or touches on the inner surface of the cavity.This utility model's air bag main body appearance has no heating sheet, make overall appearance more simple, beautiful, and reduce user's body feeling foreign body sensation, also make air bag main body easy to wash clean.In addition, the heating sheet of this utility model is attached or touches on the inner surface of the cavity at least in the air bag main body inflation state, so that heating sheet can quickly conduct heat to air bag main body in heating state, so as to be able to carry out quick hot compress massage to the part that user needs to massage.

The utility model provides a grease-proof corrugated board suitable for cold-chain logistics, which sequentially comprises a grease-proof coating, a low-temperature-resistant PLA (polylactic acid) lamination layer, a wavy buffer layer, a rebound filling layer, a degradable PE (polyethylene) preservative film layer, an oil-resistant coating, a honeycomb board layer, an oleophobic activated carbon non-woven fabric layer and a high-density corrugated paper inner layer from outside to inside, and the rebound filling layer is correspondingly arranged in a corrugated gap of the wavy buffer layer in a filling manner. High low temperature resistance and grease permeation resistance are realized.

The utility model relates to the technical field of mixing bins, and discloses a gravity mixing bin structure which comprises a bin body, a central mixing pipe, a plurality of peripheral mixing pipes and a bottom ventilation pipe, the central mixing pipe is vertically arranged in the center of the bin body, the peripheral mixing pipes are evenly distributed on the circumference with the center of the bin body as the circle center and the radius of the bin body as the diameter, and the bottom ventilation pipe is arranged in the center of the bin body. Comprising an annular main body and a plurality of branches connected with the main body, the annular main body is arranged around the peripheral side of the bin body, the ends, away from the main body, of all the branches are inserted into the bin body, and the bottom ventilation pipe is used for introducing gas into the bin body. Compared with a traditional wall-attached type, the gravity mixing bin structure has the advantages that accumulation and bridging phenomena of viscous materials can be effectively reduced, and the mixing effect on the viscous materials is improved.

This invention discloses a cold spraying molding method for the outer wall of a combustion chamber, comprising the following steps: S1, filling with filler: first, milling grooves in the inner wall of the substrate to form grooves, and then cleaning and drying them, then filling the grooves with conductive filler until they are flush with the top surface of the grooves, and obtaining the substrate surface after the conductive filler solidifies; S2, cold spraying a pure copper layer: after cleaning and drying the substrate surface, cold spraying pure copper powder onto the substrate surface to form a pure copper layer; S3, cold spraying a pure nickel layer: after cleaning and drying the pure copper layer, cold spraying pure nickel powder onto the surface of the pure copper layer to form a pure nickel layer; S4, removing filler; The cold spraying technology used in this invention has no high-temperature process, avoiding the softening of the inner wall material and residual thermal stress during the deposition process, resulting in high bonding strength; high deposition rate, greatly shortening the manufacturing cycle of the outer wall of the combustion chamber.

The utility model belongs to the technical field of floor processing, and particularly relates to SPC floor heating equipment which comprises a first heating mechanism, a second heating mechanism and a third heating mechanism, the first heating mechanism comprises a first conveying pair, the first conveying pair is suitable for conveying plates, and a first heating box and a primary heating SPC plate are erected above the first conveying pair; the second heating mechanism comprises a second conveying pair, the second conveying pair is arranged at an outlet of the first conveying pair so as to receive the SPC board subjected to primary temperature rise, a centering mechanism is arranged at an inlet of the second conveying pair so as to center the SPC board, and a second heating box is arranged at an outlet of the second conveying pair so as to perform secondary temperature rise on the SPC board; in short, according to the SPC floor heating equipment, the first heating mechanism is arranged to preheat the plates, softening of the plates is avoided, after the preheated plates enter the second conveying pair, centering positioning is completed through the centering mechanism, then the plates are heated by the second heating box at the outlet, and after softening of the plates is completed, the plates are directly conveyed to subsequent equipment.

The invention discloses a guide rail, an engine timing system, an engine and a vehicle, the guide rail is provided with a first side part and a second side part which are oppositely arranged, the first side part is provided with a guide surface used for abutting against one side, in the thickness direction of a chain, of the chain, and the thickness direction of the guide rail and the extending direction of the guide rail are both perpendicular to the width direction of the guide rail; in a projection plane parallel to the thickness direction and the width direction of the guide rail, a projection line formed by the guide surface protrudes back to the second side part in the thickness direction of the guide rail, and the projection line is provided with a first end point, a second end point and a protruding part located between the first end point and the second end point which are arranged in the width direction of the guide rail; and in the direction from the protruding part to the first end point and the direction from the protruding part to the second end point, the protruding distance of the projection line is gradually reduced. According to the guide rail, the problem that the guide face is prone to abrasion can be solved, and the NVH performance of an engine timing system is improved.

The utility model provides an anti-settlement structure suitable for roadbed filling and excavation junction, which comprises an original ground, an excavation area and a filling area, the excavation area and the filling area are positioned above the original ground, a drainage dredging layer is arranged at the bottom of the filling area, and a group of drainage pipes are transversely arranged in the drainage dredging layer. A plurality of sets of drainage holes arranged at equal intervals are formed in the outer portion of the drainage pipe, tamping layers are laid on the drainage dredging layer, and a plurality of geogrids are arranged between the tamping layers. Through cooperation of the drainage and dredging layer, the drainage pipe, the drainage holes, the tamping layer, the geogrid and the buffer transition layer, the stability of the filling and digging junction of the roadbed can be improved, sedimentation can be effectively controlled, the tamping layer can ensure the compactness of a soil body, the geogrid enhances the anti-sliding and anti-deformation capacity of the soil body, the drainage and dredging layer can drain accumulated water in time, and the safety of the roadbed is improved. And the buffer transition layer reduces the impact of the vehicle load, so that the stability of the roadbed is guaranteed.

This utility model discloses a crack-resistant cold recycled pavement structure, belonging to the field of recycled pavement technology. Key technical features include a supporting base course, a cold recycled base course on top of the supporting base course, a crack-resistant transition layer on top of the cold recycled base course, a drainage bonding layer on top of the crack-resistant transition layer, and a functional surface layer on top of the drainage bonding layer. Through the combined design of the crack-resistant transition layer, fiberglass grid, and emulsified asphalt bonding layer, the pavement's crack resistance is significantly improved. The crack-resistant transition layer has good flexibility, buffering temperature stress and vehicle load impact. Furthermore, the fiberglass grid, embedded in the center of the crack-resistant transition layer, utilizes its high strength to disperse stress at the crack tip, preventing upward reflection of base course cracks. Combined with the emulsified asphalt bonding layer, it enhances the bonding force between structural layers, preventing interlayer slippage and the generation of new cracks, thus reducing the overall occurrence of reflective and longitudinal cracks.