26 results about "Expansion rate" patented technology

The invention relates to the technical field of measurement work after tube expansion of a shell-and-tube heat exchanger, and discloses a tube hole measuring device and application, the tube hole measuring device comprises a shell, the shell is provided with a hollow cavity, at least three round holes used for placing steel balls are arranged along the peripheral wall of the shell, and the round holes are communicated with the hollow cavity of the shell; the steel balls are placed in the round holes; the center rod is arranged in the hollow cavity and moves in the axial direction of the hollow cavity, and one end of the center rod extends to the outer side of the shell; the part, located in the hollow cavity, of the center rod is a taper section. The farther the taper section is away from the center rod positioning ring, the smaller the diameter is. The expansion amount of the three steel balls is adjusted through displacement of the center rod with the taper, the measurement size is adjusted, and the diameter of the steel balls corresponding to the minimum value and the maximum value of the expansion rate is adjusted through the center rod positioning ring; the length of the expanded connection position is positioned through the shell positioning ring. When the expansion pipe hole is used, the measuring steel ball end with the minimum expansion rate can enter the expansion joint position, the measuring steel ball end with the maximum expansion rate cannot enter the expansion joint position, the expansion pipe hole is qualified, and otherwise, the expansion pipe hole is unqualified.

The invention belongs to the field of pipeline steel pipe manufacturing, and particularly relates to a plate shape detection device and method for a pre-bent straight seam steel pipe. The problems that an existing method is large in error and poor in practical application guiding effect are solved. The device comprises a supporting device, a guiding device, a moving device, a measuring device and a centering device. Calculating a theoretical inner radius based on the outer diameter of the steel pipe, the wall thickness of the steel plate and the steel pipe expanding rate; obtaining two-dimensional contour data of the pre-bent plate shape based on a measuring device; calculating the pre-bending angle of the steel pipe; calculating coordinates of a third coordinate point and a fourth coordinate point; further calculating the coordinates of the circle center, and determining a second coordinate point based on the coordinates of the circle center and the two-dimensional contour data; calculating a first measurement radius of the pre-bent plate edge arc based on the coordinate of the circle center and the coordinate of the fourth coordinate point; and then judging whether process adjustment is needed. According to the invention, the online detection of the pre-bent plate shape quality is realized, the actual production demand is met, and the error is small.

The utility model relates to the technical field of machining workpiece measurement, in particular to a perpendicularity measuring device for a hole expansion rate sample. A perpendicularity measuring device for a hole expansion rate sample comprises a mounting base, a measuring supporting rod and a measuring part, the mounting base is provided with a sample mounting position, the sample mounting position is provided with a positioning piece, the positioning piece is used for fixing the position of the sample on the sample mounting position, and the measuring supporting rod is arranged in the range of the sample mounting position. The measuring part comprises a measuring piece, a first adjusting piece and a second adjusting piece, the first adjusting piece is used for adjusting the position of the measuring piece in the extending direction of the sample pore channel, and the second adjusting piece is used for adjusting the distance between the measuring end of the measuring piece and the inner wall of the sample pore channel. The size change is small for single-specification and batch manufacturing, timely detection can be achieved after each batch of samples is machined, and the measuring device is simple, easy to manufacture, low in cost and high in measuring precision.

The invention provides a method for estimating thermal expansion molding process parameters of a foam sandwich composite material, the foam sandwich composite material and a preparation method of the foam sandwich composite material. The estimation method comprises the following steps: testing an expansion pressure-time relation curve of the expandable foam rubber under the conditions of different temperatures and different expansion rates, and when the maximum value of the expansion pressure exceeds 100 kPa, recording a corresponding expansion rate range and a temperature range; testing a viscosity-curing time relation curve of resin in the prepreg at different temperatures, and recording a corresponding temperature range when the curing time does not exceed 10 minutes and the viscosity is not lower than 100 Pa.s; and taking the overlapped part of the recorded temperature range of the expandable foam rubber and the recorded temperature range of the resin as an estimated temperature range of thermal expansion mold pressing, and taking the recorded expansion rate range as an estimated expansion rate range of a thermal expansion mold pressing process. According to the estimation method, the production process stability of the sandwich composite material is improved.

The invention discloses a complex structure casting resin sand gravity casting liquid weight calculation method, and relates to the technical field of equipment manufacturing, and the method comprises the following steps: building a casting part finished product three-dimensional model; the machining allowance grade is determined according to the nominal size of the part finished product three-dimensional model, and the part finished product three-dimensional model is adjusted based on the machining allowance grade to obtain a process blank model; designing a pouring pipeline model and a riser model; obtaining the volume of each model based on three-dimensional design software; selecting a reasonable volume shrinkage rate epsilon v according to the element content in the raw material molten steel; obtaining a resin sand box expansion rate fv based on measured data; correcting the volume of the process blank model based on the volume shrinkage rate epsilon v and the resin sand box expansion rate fv; and the mass of molten iron needed for pouring is calculated based on the volume of each model. According to the method, the residual molten steel is smaller than or equal to 4%, the yield is 50% or above, the material utilization rate is synchronously increased by 3-10%, cost reduction, energy conservation and zero test are achieved, and the problem that molten steel raw materials are wasted during gravity casting of complex-structure casting resin sand is solved.

The present invention discloses a method for manufacturing an inner pot (30) of a non-stick pot, comprising the steps of: providing a metal plate material having at least an outer metal layer (321), a heat-soaking layer (322), and an inner metal layer (323); etching, engraving, or pressing the inner metal layer (323) to form an anti-stick array (33) including a plurality of grooves or protrusions; stretching the metal plate material with the anti-stick array (33) by controlling the tensile rate to manufacture the inner pot (30); or stretching the metal plate material with the anti-stick array (33) by controlling the tensile rate to produce an inner pot blank (S04); and adjusting the expansion rate. and (S06) manufacturing the inner pot (30) by controlling the expansion of the inner pot blank. The thickness ratio between the side wall and the bottom wall of the manufactured inner pot (30) is 0.9 to 1.1, and the thickness ratio between the outer metal layer (321) and the inner metal layer (323) is 0.6 to 1.4, so that the grooves or protrusions deformed by tension in the anti-stick array (33) are within a predetermined range, and the area change of the area where the grooves or protrusions are located is within a controllable range, so that the rice and the anti-stick array (33) on the side wall of the inner pot (30) are in excellent contact with each other.

The invention relates to the technical field of material analysis, and discloses a wire cold bending crack resistance evaluation method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the radial stress and shear stress of a preset test point under each bending degree when a target wire is subjected to symmetric cold bending according to different bending degrees, determining the key bending degree based on the shear stress, and determining the bending degree of the target wire according to the key bending degree; determining a shear stress influence factor according to the shear stress corresponding to the key bending degree, determining a radial stress influence factor according to the radial stress corresponding to the initial bending degree, the tail end bending degree and the later bending degree, and determining cold bending crack resistance parameters of the target wire according to the shear stress influence factor and the radial stress influence factor. The method can break through the limitation that the existing standard only judges whether the crack exists or not, realizes full-dimension quantitative evaluation of the crack initiation tendency, the expansion direction and the expansion rate of the wire material, covers the core key index of the cold bending crack resistance, and improves the accuracy of wire material quality evaluation.

This disclosure relates to the field of expansion rate testing technology. One embodiment of this disclosure provides a free expansion rate tester, which includes: a placement tray, a feeding hood disposed on the upper surface of the placement tray, a vibrating feeding component disposed on the feeding hood, and a collection and cleaning component disposed on the placement tray; the vibrating feeding component includes an extension block, a drive motor disposed on a mounting frame, a drive shaft disposed at the output end of the drive motor, and a stirring blade disposed on the drive shaft, the stirring blade being embedded inside the feeding hood. This technical solution solves the problem of manual operation methods in the prior art, such as manually pouring materials and mixing based on experience, which are not only inefficient but also prone to large deviations and poor repeatability in test results due to human factors. Furthermore, in the material feeding stage, it is difficult to ensure consistent feeding speed, quantity, and uniformity each time, which greatly interferes with the accuracy of subsequent expansion tests.

This invention discloses a method and apparatus for determining the expansion rate of steel slag asphalt mixture based on image processing, comprising: acquiring visual morphology data of steel slag asphalt mixture specimens during the expansion process according to a preset time sequence, wherein the visual morphology data includes a sequence of images that at least reflect the surface contour and steel slag particle distribution of the steel slag asphalt mixture specimens; determining characteristic parameters characterizing the expansion state of the steel slag asphalt mixture specimens using a computer vision algorithm based on the visual morphology data, wherein the computer vision algorithm includes at least image denoising, geometric correction, and target region segmentation; and calculating the expansion rate of the steel slag asphalt mixture specimens based on the characteristic parameters and a pre-established mapping relationship between pixel space and physical space.

This invention provides a composite board, furniture, and door panel. The composite board includes a substrate and a ceramic substrate. The substrate has a first surface and a second surface. The ceramic slab is attached to the first surface of the substrate. The ratio of the water absorption thickness expansion rate of the substrate to that of the ceramic slab is in the range of 0.05 to 20. Because the ceramic slab is attached to the surface of the substrate, it can prevent scratches or cracks from appearing on the surface of the composite board. Furthermore, since the ratio of the water absorption thickness expansion rate of the substrate to that of the ceramic slab is in the range of 0.05 to 20, that is, the ratio of the water absorption thickness expansion rate of the substrate and the ceramic slab is small, it can avoid the composite board from delamination and breakage caused by cooling water during the cutting process.

The application discloses a production system for concrete grouting material, and relates to the technical field of grouting material production.The production system comprises a raw material mixing box and a grouting material packing table, a mounting rod is fixed on the top of the grouting material packing table, a quantitative discharging box is mounted on one side of the upper end of the mounting rod, a spiral conveyor is arranged between the raw material mixing box and the quantitative discharging box, the feeding end of the spiral conveyor is communicated with the discharging opening of the raw material mixing box, and the discharging end is inclined upward and communicated with the feeding opening of the quantitative discharging box.The application can detect the expansion rate of the grouting material by adding a part of the grouting material into the detection box until the grouting material overflows, smoothing the top, covering the detection box with a glass plate, adjusting the dial gauge until the probe of the dial gauge is against the glass plate, rotating the detection box until the detection box is located directly above the detection plate, opening the blocking plate when the grouting material solidifies, and making the solidified grouting material fall on the detection plate, and then the hardness of the solidified grouting material is tested by the hydraulic cylinder.

The invention provides a high-strength moisture-proof medium-density fiber artificial board and a preparation method thereof, and belongs to the technical field of artificial board manufacturing and composite materials. The high-strength moisture-proof medium-density fiber artificial board is prepared from the following raw materials in parts by weight: 70-90 parts of wood fibers, 3-8 parts of surface modified reinforced fibers, 10-15 parts of an isocyanate adhesive, 2-5 parts of a moisture-proof agent, 1-4 parts of nano silicon dioxide, 1-4 parts of an interfacial compatible flame retardant and 1-3 parts of a curing agent. The board is endowed with extremely low water absorption thickness swelling rate, high strength, excellent moisture resistance and good flame retardance through the synergism of all the components, the board is suitable for a high-humidity environment, uniform dispersion and sufficient curing of the components are ensured by adopting a step-by-step sizing and mixing process and cooperating with a two-stage hot pressing process, the uniformity and stability of product performance are ensured, and the board is suitable for being used in a high-humidity environment. The common problems of agglomeration, non-uniform dispersion and the like of a multi-component composite system are solved.

The present application belongs to the technical field of comprehensive utilization of solid waste, and particularly relates to a method for resource utilization and quality grading of road steel slag aggregate, which comprises the following steps: step 1, obtaining multiple grades of steel slag aggregate by aging, crushing and screening the steel slag, and obtaining an expansion strain field gray image time sequence; step 2, extracting images at multiple time points from the expansion strain field gray image time sequence, stacking the images into a multi-channel input tensor, and inputting the tensor into a convolutional neural network model to output probability values of three grades of stability, i.e., excellent stability, medium stability and poor stability; and step 3, determining the mechanical durability index of each grade of steel slag aggregate with a continuous stability score reaching a set threshold value, and preparing each grade of steel slag aggregate into building materials corresponding to the road layer position. The present application breaks through the limitation of traditional autoclaved expansion rate method which only outputs a single scalar value, and realizes high-dimensional characterization of the expansion space distribution pattern and time sequence evolution pattern.

The utility model discloses a device for detecting the expansion rate of a concrete expansive agent, which comprises a machine body, an operating room is arranged in the machine body, a supporting table is arranged in the operating room, a moving mechanism is arranged on the supporting table, a placing plate for placing a test block is arranged on the moving mechanism, and a clamping mechanism is arranged on the placing plate. First laser range finders are arranged on the two inner side walls of the operation chamber, the first laser range finders on the two side walls emit laser towards the direction where the containing plate is located, the laser emitting centers are located on the same straight line, a second laser range finder is arranged on the top wall in the operation chamber, and the second laser range finder emits laser downwards. According to the utility model, the laser range finder is used for detecting the test block, so that a worker does not need to carry out repeated tests for many times, the detection steps are relatively simple, and the detection result is more accurate. Meanwhile, the test block is not influenced by external force, and the measured shrinkage or swelling amount is small in error.

The invention belongs to the field of civil construction engineering, and particularly relates to a design and construction technology of a concrete-filled steel tube structure, in particular to a method for determining an expansion rate limit value of concrete in a concrete-filled steel tube structure and a storage medium. And the selection of the expansion rate is converted from empirical and qualitative judgment to quantitative and scientific design based on a mechanical model. According to the scheme, the expansion characteristic of the concrete material and the strength safety of the steel pipe structure are linked through a rigorous mechanical model for the first time, and the crossing from the empirical material ratio to the quantitative design based on the structural system performance is realized. And a key theoretical tool and a design basis are provided for solving the problem of how to reasonably use the expanding agent, which puzzles the engineering for a long time.

This invention relates to a nano-metakaolin-modified hydraulic lime-based composite material and its preparation and application. The composite material comprises natural hydraulic lime and nano-metakaolin dispersed in the natural hydraulic lime, wherein the mass ratio of natural hydraulic lime to nano-metakaolin is (60-90):(10-40). The nano-metakaolin-modified hydraulic lime-based composite material of this invention exhibits controllable dispersibility and fluidity in the slurry after mixing with water. It also demonstrates good rock compatibility, low soluble salt content, controllable curing time, suitable post-curing strength, low permeability, and low shrinkage and expansion rate. The presence of a repair agent can specifically enhance the additional protective performance of the reinforcement material. It possesses high applicability, safety, and durability for the protection of stone cultural relics, without causing derivative damage.

The invention discloses a rolling mill stand resin sand gravity casting liquid weight calculation method, and relates to the technical field of equipment manufacturing, and the method comprises the following steps: selecting the linear shrinkage rate epsilon L of a casting in different directions according to the wall thickness and length of the casting; obtaining a resin sand box expansion rate fv based on measured data; adjusting the process blank model based on the linear shrinkage rate epsilon L and the resin sand box expansion rate fv; a pouring pipeline model and a riser model are designed based on the process blank model, and the volume of the process blank model, the volume of a pouring pipeline and the volume of a riser are obtained based on three-dimensional design software; and calculating the mass of molten iron required for pouring based on the adjusted volume of the process blank model, the volume of the pouring pipeline and the volume of the riser. According to the method, epsilon L and fv are obtained through a standardization method, cost reduction, energy conservation and zero mold testing are achieved, and the problems that in an existing rolling mill stand resin sand gravity casting technology, the precision of an empirical coefficient method is low, the difference of linear shrinkage in different directions is not considered, the box expansion rate is not quantized, and the accuracy is poor are solved.

The application relates to the technical field of refractory materials, and particularly relates to a homogenized magnesia spinel brick with long service life and low expansion rate, which comprises the following raw materials in percentage by weight: sintered spinel 25-35%, modified silicon carbide whisker 1-3%, composite metal additive 2-6%, main binding agent 2-5% and auxiliary binding agent 0.8-1%, and the rest is microcrystalline magnesia. The modified silicon carbide whisker with a special structure is introduced as an interface modification reinforcing phase, and the raw material formula and the homogenization process are optimized, and the auxiliary binding agent is added, so that the thermal shock resistance stability and the mechanical properties of the material are remarkably improved, the thermal expansion rate is reduced, the molten slag resistance is good, and the service life is greatly prolonged.

HOT-ROLLED HIGH-STRENGTH STEEL STRIP WITH HIGH HOLE EXPANSION RATE. The present invention relates to a high-strength steel with a careful selection of the normal alloying elements C, Mn, Si, and Al, along with the addition of microelements. This high-strength steel with a high hole expansion rate can be produced. The invention also relates to the method of producing this high-strength steel.

The application discloses a novel hydraulic variable-diameter expansion cone, which comprises a drilling tool joint, an outer fixed pipe and two hydraulic cylinders, the drilling tool joint, the outer fixed pipe, the right hydraulic cylinder and the left hydraulic cylinder are sequentially connected in series through butt joint, and a sealing ring is arranged at the butt joint part; a connecting head is further fixedly connected to the left side of the left hydraulic cylinder; an expansion block is arranged on the left side of the expansion cone; a pressure relief valve is arranged on the left side of the expansion cone; eight circular-arc grooves are equidistantly arranged on the surface of the connecting head close to the left end; the inner surfaces of the circular-arc grooves are all slidably connected with expansion blocks; the expansion cone comprises a cylindrical part and a conical part; and the application relates to the technical field of expansion pipes. The novel hydraulic variable-diameter expansion cone can adjust the expansion rate of the expansion pipe through the design of the expansion cone and the expansion blocks, and can theoretically expand to all expansion rates within the preset expansion rate range, so that the expansion pipe has the ability of stepless expansion.

The invention provides a self-expanding material sealing performance simulation test device and evaluation method.The self-expanding material sealing performance simulation test device comprises a first sleeve with the two ends arranged in a sealed mode, a second sleeve with the two ends arranged in a sealed mode is arranged in the first sleeve, and the cylindrical body is used for bearing a self-expanding material; the first end and the second end of the first sleeve are provided with a first liquid pressing hole and a second liquid pressing hole respectively, the first liquid pressing hole and the second liquid pressing hole are connected through a high-pressure liquid circulation channel, and a one-way pressurization system is arranged on the high-pressure liquid circulation channel. The first end and the second end of the first sleeve are connected with a first pressure testing device and a second pressure testing device respectively. The sealing performance simulation test device can be used for testing the expansion rate and the dynamic sealing pressure of the self-expansion material.

The invention belongs to the technical field of internal high-pressure forming, and particularly discloses an internal high-pressure forming method and system.The internal high-pressure forming method comprises the steps that the first to Nth successive die attaching positions are determined based on pipe blank internal high-pressure forming finite element simulation analysis; the interior of the pipe blank is boosted through axial feeding so that the pipe blank can be sequentially attached to the inner wall of a mold cavity, relative displacement signals of all mold attaching positions are periodically collected in the process, and mold attaching completion is judged according to the mold attaching sequence and the characteristic that the signals suddenly increase to a platform. If the next position displacement signal is detected in the preset time window, continuing to load the path; if the signal deviates from the set path, the material supplementing displacement is adjusted according to local die pasting delay / sequence abnormity, and the internal pressure output is adjusted according to the overall expansion rate deviation; and when the abnormity continuously exceeds a second time threshold value or the adjustment reaches a mechanical limit, alarming and pressure relief are performed, and axial retreating is performed. According to the method, the die pasting state can be accurately monitored, the forming quality is guaranteed through a targeted correction strategy, and the process stability and safety are improved.

This invention discloses a seamless construction method for ultra-long, ultra-thick, large-volume concrete, relating to the field of seamless construction technology. The method includes the following steps: S1, conducting an expansion rate mix design test: The final deformation rate is calculated based on the combined effects of internal and external temperature differences, shrinkage deformation caused by drying shrinkage, and compensating for the expansion effect. S2, crack verification: When comparing the final deformation rate with the ultimate elongation rate that the concrete itself can withstand, if the final deformation rate under the combined effect is less than the ultimate elongation rate of the concrete, it is inferred that the concrete is safe and will not crack. If the verification fails, step S1 is repeated; if the verification passes, step S3 is performed. This invention uses an expansion rate mix design test to verify the feasibility of the concrete mix design, i.e., to determine the reasonable proportion of each component in the concrete. The test can evaluate the expansion performance of concrete under different mix designs, thereby selecting the optimal mix design.

The invention relates to the technical field of ice cream processing, and discloses a raw material preparation method and system.The raw material preparation method comprises the steps that various raw materials are mixed to form an ice cream mixture, and the mixture is subjected to temperature and shear force synergistic treatment; monitoring the dynamic viscosity and temperature data of the mixture in real time, and inputting the dynamic viscosity and temperature data into the collaborative regulation and control model; according to the model output, dynamically adjusting temperature and shearing action parameters in the co-processing process to enable the state of the mixture to approach to a preset target state; calculating an expansion rate index predicted value and a melting resistance index predicted value based on the regulated and controlled state data of the mixture; and comparing the predicted value with a preset target value, and correspondingly adjusting the raw material preparation parameters and the material pretreatment parameters according to a comparison result. Through real-time monitoring, model cooperative regulation and prediction feedback, closed-loop and adaptive control of the ice cream production process is realized, and the problem that the expansion rate and the melting resistance of the ice cream are difficult to control is solved.

The application discloses a bidirectional expansion rate testing device for reinforcement pouring material and a testing method thereof, which comprises a thin plate test mold, a transverse steel wire framework, a longitudinal steel wire framework and a micrometer; the space enclosed by the transverse steel wire framework and the longitudinal steel wire framework is used for pouring the concrete to be measured; the transverse steel wire framework comprises steel wires and lateral steel plates; the longitudinal steel wire framework comprises steel wires and lateral steel plates; the inner wall of the space enclosed by the transverse steel wire framework and the longitudinal steel wire framework is provided with a plastic film; the lower surface of the plastic film is adhered to the inner wall of the space enclosed by the inner and outer steel rings through transparent glue, and the upper surface of the plastic film is smeared with waterproof agent. The expansion rates in the transverse and longitudinal directions are simultaneously measured to truly reflect the expansion rate of the reinforcement pouring material for the steel pipe with an increased section, the test error caused by measuring the unidirectional expansion rate is avoided, and the measurement result is more accurate; and the testing device is simple and can be repeatedly used.

This invention discloses a controllable preparation method for high-strength, moisture-resistant cork composite boards. Addressing the technical problem of coupling raw material and process parameters in the cork composite board preparation process, and the difficulty of simultaneously meeting both mechanical and moisture-resistant performance indicators using traditional trial-and-error methods, this invention establishes a multiple quadratic regression model relating cork particle size distribution, adhesive content, filler content, coupling agent content, and temperature, pressure, and time during pre-pressing, hot-pressing, and depressurization stages. Interaction terms and quadratic terms between raw material and process parameters are introduced to characterize the multivariate nonlinear coupling relationship. Using a lower limit threshold for tensile strength and an upper limit threshold for water absorption thickness expansion rate as constraints, an objective function containing a squared deviation term is constructed. The optimal combination of process parameters is iteratively solved using a Gaussian process surrogate model and a Bayesian optimization algorithm with an expected improvement acquisition function. Hot-pressing according to the optimized parameters yields a composite board with a tensile strength of 2.68 MPa and a water absorption thickness expansion rate of 0.72%, achieving controllable preparation of both mechanical and moisture-resistant properties.