70 results about "Expansion rate" patented technology

The invention relates to the technical field of injection molding, in particular to a PP stationery sealing film injection mold which comprises a fixed mold body and further comprises a mold cavity, a movable mold body, a mold core, a pressing plate, a pressure applying assembly, an air pressure film, a locking assembly and a flow guide pipe, the movable mold body is connected to the upper side of the fixed mold body, and the opposite ends of the fixed mold body and the movable mold body are provided with a cavity and a cavity opening correspondingly; the mold cavity and the mold core are connected to the cavity and the cavity opening correspondingly, the pressing plate is connected between the fixed mold and the movable mold, the pressure applying assembly is connected to the right side of the pressing plate, the air pressure film is connected to the lower side of the pressure applying assembly, the middle of the pressure applying assembly and the air pressure film jointly form a sealing cavity, and the locking assembly is connected to the upper side of the air pressure film. The expansion rate of the air pressure film and the extension rate of the film are set according to the same ratio, and the heating duration of the film is in direct proportion to the vertical distance of the mold, so that the extension rate of the middle part of the film is effectively improved, and the purpose of ensuring the appearance quality of a product is achieved.

A negative electrode material, comprising composite particles. Each of the composite particles comprises a core and an amorphous carbon coating layer located on the surface of the core, wherein the core comprises a graphite framework and amorphous carbon in the graphite framework; and the amorphous carbon coating layer has a thickness of 10-50 nm. Raman spectral area scanning is performed on the negative electrode material, and there are 400 Raman spectral area scanning points; and the average ID / IG value of the Raman spectrum of the negative electrode material is 0.10-0.20, wherein the proportion of the number of scanning points having a single-point ID / IG value of less than 0.2 is greater than 60%. The negative electrode material has a high compaction density, a high capacity, a low expansion rate, good rate performance, and good high-temperature cycling performance.

The invention relates to the technical field of expansion cone tools, in particular to a composite expansion cone system for an expansion screen pipe. The problems that in the prior art, due to the fact that the outer diameter of an expansion cone is small, the expansion rate of an expansion screen pipe is not enough, due to the fact that the outer diameter of the expansion cone is large, the expansion cone can not be lowered to a designated position, and even if the expansion cone with the larger outer diameter is lowered to the designated position smoothly, the expansion screen pipe cannot be expanded are solved. However, due to the fact that the expansion rate is increased, larger expansion resistance can be brought, and the risk that the expansion cone is clamped is increased. According to the composite expansion cone system for the expansion screen pipe, the expansion rate of an expansion pipe column is increased as much as possible through a composite expansion cone part, the risk of clamping an expansion cone is reduced, and rebound of the pipe column after expansion is reduced so as to guarantee that the designed expansion rate can be achieved; the variable-diameter cone is of a split type structure, when the expansion cone is clamped, the split expansion cone can be lifted up and expanded again, the limitation of the inner diameter of the hanger on the outer diameter of the expansion cone is reduced to a certain extent, and the purpose of achieving the larger expansion rate is achieved.

The invention provides a long-term expansion prediction method and device for an aged steel slag asphalt mixture, and relates to the field of material testing. The method comprises the following steps: manufacturing a standard steel slag test piece through a preset treatment method, and respectively obtaining a plurality of target masses corresponding to the standard steel slag test piece under different experimental conditions according to preset steps; calculating the corresponding first bulk density of the standard steel slag test piece before expansion according to the multiple target masses; placing the standard steel slag test piece in a target constant-temperature and constant-pressure environment for stacking operation; obtaining a plurality of target aging masses corresponding to the standard steel slag test piece under different experimental conditions according to preset steps after a preset time period; according to the multiple target aging masses, the corresponding second bulk density of the standard steel slag test piece after expansion is calculated; calculating volume expansion rate data corresponding to the standard steel slag test piece according to the first bulk density and the second bulk density; acquiring volume expansion rate data of the standard steel slag test piece in a plurality of different times according to the selected time; and inputting the volume expansion rate data at different times into the prediction model, and outputting the predicted expansion rate corresponding to the standard steel slag test piece through the prediction model. According to the method, the problems that the long-term expansion behavior prediction of the steel slag asphalt mixture is insufficient and the change trend of the expansion rate along with time cannot be accurately mastered due to the lack of effective data fitting in the traditional method are solved.

The invention relates to the technical field of batteries, in particular to a negative electrode material and a preparation method and application thereof. The negative electrode material comprises a composite particle, the composite particle comprises an inner core and an amorphous carbon coating layer located on the surface of the inner core, and the inner core comprises a graphite skeleton and amorphous carbon filled in the graphite skeleton; the thickness of the amorphous carbon coating layer is 10 to 50 nm; raman spectrum surface scanning is carried out on the negative electrode material, the number of Raman spectrum surface scanning points is 400, the average value of ID / IG of the Raman spectrum of the negative electrode material is 0.10-0.20, and the number of the scanning points with the ID / IG single point value smaller than 0.2 accounts for larger than 60%. The graphite-like microchip layers on the surface of the negative electrode material are stacked more regularly, the thickness of the amorphous carbon coating layer is appropriate, and the negative electrode material has high compaction density, high capacity, low expansion rate, good rate capability and good high-temperature cycle performance.

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 a composite type self-expansion packer which comprises an expansion pipe body, and the two ends of the expansion pipe body are connected with connecting joints. And the self-expansion long rubber sleeve is attached to the peripheral wall of the expansion pipe body in a sleeving manner. Wherein the self-expansion long rubber sleeve is constructed to be composed of rubber of different rubber layers, and the expansion rates of the rubber of the different rubber layers are sequentially increased from outside to inside. According to the composite self-expansion packer, the sealing effect and the operation and use convenience can be improved, and it is guaranteed that the setting quality is qualified.

The invention discloses a long-wall concrete structure crack control method based on limited horizontal shrinkage strain, and belongs to the technical field of water transportation and hydraulic engineering. The long wall concrete structure crack control method based on the limited horizontal shrinkage strain comprises the steps that S1, the horizontal shrinkage strain of each gradient structure preset elevation position in a same-proportion concrete small model section is obtained; s2, calculating and obtaining the limited horizontal shrinkage strain of the preset elevation position of each gradient structure in the same-proportion concrete small model section, and determining the limited horizontal shrinkage strain value of each gradient structure; s3, carrying out a restrained expansion rate test of the expansive concrete; s4, determining the expansive concrete mix proportion of each gradient structure; and S5, vertical gradient concrete construction of the long wall concrete structure is conducted according to the mixing proportion of the gradient expansive concrete. According to the invention, the total mixing amount of the expanding agent can be effectively reduced while the same shrinkage compensation effect of the concrete is ensured, and the anti-cracking cost of the structure is reduced.

This invention discloses a high-strength particleboard and its preparation method, belonging to the field of particleboard production technology. The high-strength particleboard includes an upper surface layer, a core layer, and a lower surface layer. Its key feature is that the lower and upper surface layers are laid in a gradient pattern. The beneficial effects of this invention are: using two types of wood chips of different sizes, shapes, and moisture contents, mixed with adhesive to prepare the core layer, forming a homogeneous structure of core layer wood chips; employing a method of mixing adhesive first and then blending materials, separately mixing the adhesive improves the expansion rate of the wood chips after water absorption, thereby obtaining a homogeneous core layer structure with uniformly mixed wood chips of different sizes. The high-strength particleboard has high strength and good physical and mechanical properties, with high internal bond strength, static bending strength, elastic modulus, and screw holding force.

The invention relates to the field of road engineering material tests, in particular to a hot-stewed steel slag soaking expansion detection device which comprises a water bath box body, an expansion rate measuring mechanism is arranged in the water bath box body and comprises an upper shell and a lower shell, and the upper shell and the lower shell are both permeable shells; the upper end of the upper shell is connected with an upper contraction section, the upper end of the upper contraction section is connected with an upper neck section, and the upper end of the upper neck section is connected with an upper accommodating body; the lower end of the lower shell is connected with a lower contraction section, the lower end of the lower contraction section is connected with a lower neck section, and the lower end of the lower neck section is connected with a lower accommodating body; the upper containing body / the lower containing body is filled with measuring beads, a first electromagnetic valve is arranged on the upper portion of the upper neck section, a second electromagnetic valve is arranged on the lower portion of the lower neck section, volume scale marks are arranged on the upper neck section and the lower neck section, and a driving mechanism is installed on the water bath box body. The Marshall test piece is subjected to volume measurement by using the filling beads, the test piece does not need to be taken out during measurement, and the detection process is rapid and efficient.

The invention relates to the field of engineering materials, and belongs to the improvement of the waterproof and anti-leakage waterstop strip structure of a construction joint of a building engineering, in particular to a bentonite-based rubber waterstop strip device that swells when in contact with water. The outer diameter of a rubber cylindrical tube closed at both ends is 28-32 mm, the wall thickness is 3.5-4.5 mm, V-shaped water-permeable holes are evenly arranged on the cylinder wall, the large end of the V-shaped water-permeable hole faces outward, the small end opening is connected to a trumpet-shaped reduced-diameter hole body extending into the rubber cylindrical tube, the trumpet-shaped reduced-diameter hole body extends out of the inner wall of the rubber cylindrical tube by a length of 4-6 mm, the large end opening diameter of the V-shaped water-permeable hole is 3.5-4.5 mm, the diameter of the reduced hole of the trumpet-shaped reduced-diameter hole body is 0.4-0.6 mm, the axial cross-section shape of the outer wall of the trumpet-shaped reduced-diameter hole body is an inwardly concave arc wall, and bentonite filler is arranged in the rubber cylindrical tube closed at both ends. The structure is simple and reasonable, the performance is reliable, the expansion ratio and expansion rate of the water stop strip can be controlled, the length of the water stop strip can be adjusted arbitrarily, water can be easily let in and difficult to let out, and the cost is low.

A forming device and manufacturing method for a gypsum mold, comprising a sheet mold forming mechanism, a mold sleeve, and a bottom mold forming mechanism. The partition of the sheet mold forming mechanism has a positioning side and a mold opening side. Any mold opening side is respectively connected to two adjacent positioning sides, and a sheet mold core is provided on each mold opening side; the mold sleeve is sleeved on the outer peripheral side of the sheet mold forming mechanism, each positioning side is in surface contact with the mold sleeve, and the outer peripheral side of the chassis is in surface contact with the mold sleeve, so that a sheet mold forming cavity is formed between any mold opening side and the chassis and the mold sleeve; a bottom mold core is provided on the upper side of the base of the bottom mold forming mechanism, and a bottom mold forming cavity is formed between the base and the movable sleeve below it; raw materials can be simultaneously poured into the bottom mold forming cavity and a plurality of sheet mold forming cavities to respectively form a bottom mold and a sheet mold; the bottom mold and the sheet mold can be spliced with each other to form a gypsum mold. The present invention solves the problem of different gypsum expansion rates, has good quality and low price, and solves the problem of misalignment of the joint line.

The invention discloses a method for collecting and testing slow expansion force, which comprises the following steps of: filling an expansion body material into a thin-wall metal tank, injecting an absorption medium, placing an amorphous thin-wall metal tank into a liquid medium, transferring mechanical force generated by expansion of the expansion body material to the liquid medium through the amorphous thin-wall metal tank, and converting the mechanical force into hydraulic force for measurement. And slow expansion force data is obtained. By adopting the innovative process method, the pressure vessel is uniformly stressed, the acquired data is accurate and reliable, the test is continuous, the operation is simple, and the universality is high. On the premise of ensuring low cost, energy conservation and environmental protection, the expansion pressure corresponding to the volume expansion rate of various slow expansion materials under different media and different temperatures can be tested, and actual data support is provided for the slow expansion materials in engineering application.

The invention provides a ceramic tile with granite texture and a preparation method thereof.The preparation method comprises the four steps of blank preparation, glazing, ink jetting and firing, alumina-zirconia composite fibers subjected to surface modification treatment are prepared into glaze slip, the glaze slip is applied to a first blank body formed by pressing ceramic tile powder, and the first blank body is prepared into a ceramic tile body; after the printing ink is sprayed on a ceramic tile blank through an ink jet printer and sintered, the specific surface area of composite fibers is remarkably increased and the number of binding sites of the composite fibers is increased by utilizing the expansion rate difference of aluminum oxide and zirconium oxide, a three-dimensional connecting interface is formed between glaze and the blank during firing, and the binding sites in the glaze improve the anchoring strength of the printing ink; the bonding force of the ink and the glaze layer is remarkably enhanced, the wear resistance and mechanical performance of the large-grain pattern layer are improved, wear and scratches during use are reduced, the service life of the ceramic tile is prolonged, the use experience of a user is improved, and the ceramic tile has the advantages of being simple in preparation process, wide in application range and convenient to popularize and implement.

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.

The application provides a ceramic tile with granite texture and a preparation method thereof, which comprises four steps of preparation, glazing, inkjet and sintering. The alumina-zirconia composite fiber subjected to surface modification treatment is made into glaze slurry, the glaze slurry is applied to a first body prepared by pressing ceramic tile powder, and the ink is sprayed on the ceramic tile body by an inkjet machine and sintered. After that, the specific surface area of the composite fiber is significantly increased by the difference in expansion rates of alumina and zirconia, the number of self-binding sites is increased, a three-dimensional connecting interface is formed between the glaze and the body during sintering, the binding sites in the glaze improve the anchoring strength of the ink, the binding force between the ink and the glaze layer is significantly enhanced, the wear resistance and mechanical properties of the big grain pattern layer are improved, the wear and scratches during use are reduced, the service life of the ceramic tile is prolonged, the use experience of the user is improved, and the method has the advantages of simple preparation process, wide application range and easy popularization and implementation.

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.

A negative electrode composite material includes a Si-M-C composite material. A conductive layer exists on a surface of the Si-M-C composite material, M includes at least one of boron, nitrogen, or oxygen. Chemical shifts of a silicon element in the Si-M-C composite material as measured in a solid-state nuclear magnetic resonance test include −5 ppm±5 ppm, −35 ppm±5 ppm, −75 ppm±5 ppm, −110 ppm±5 ppm. A peak width at half height at −5 ppm±5 ppm is K, and K satisfies: 7 ppm<K<28 ppm. The negative electrode composite material exhibits a relatively low expansion rate and a relatively high conductivity. A negative electrode plate and an electrochemical device made of the negative electrode composite material exhibit high cycle performance.

The invention is applicable to the field of artificial board detection technology, and provides a device for testing the water absorption thickness expansion rate of artificial boards and veneer artificial boards, comprising: a handle; an upper frame; a handle arranged on the upper frame; a base frame; a leg groove on the base frame, and a leg capable of being inserted into the leg groove on the upper frame; when the leg is inserted into the leg groove, the upper frame and the base frame bracket form an independent space for placing artificial board specimens. Compared with the prior art, the device of the invention has a simple structure and is easy to operate, and can meet the national standard requirements for testing the water absorption thickness expansion rate of artificial boards and veneer artificial boards, and does not need to apply a weight to the surface of the artificial board specimen, so that the specimen will not be closely attached to the bottom surface of the weight and cannot fully absorb moisture and expand, and avoids the problem that the specimens overlap and contact with each other, which affects the test results, and can test multiple artificial board specimens at one time, with high efficiency, and can be applied to the testing of various artificial boards.

The preparation mold of the sealing element comprises an upper mold and a lower mold, at least two containing cavities are formed after the upper mold and the lower mold are closed, the upper mold comprises a first forming face, the lower mold comprises a second forming face, at least part of the first forming face forms at least part of the upper wall face of the containing cavity, and at least part of the second forming face forms at least part of the lower wall face of the containing cavity. At least part of the second forming surface forms at least part of the lower wall surface of the accommodating cavity; the containing cavity comprises a first containing cavity body and a second containing cavity body, the first containing cavity body extends in an arch shape, the second containing cavity body is located on the periphery of at least part of the first containing cavity body, and the first containing cavity body is communicated with the second containing cavity body. A certain extension space is reserved between the two different materials, material wrinkles caused by different expansion rates of the materials after temperature rise in the machining process are reduced, and the forming yield of the sealing element can be improved.

The utility model discloses a lateral expansion rate test device of an adaptive expansion rock sample radius, comprising a base, a test container is fixedly arranged on the base, and the test container is connected to a water source; an adaptive radius sample box is arranged in the test container, and is cylindrical, and is used to accommodate the expansion rock sample; a water inlet hole is opened at the bottom of the adaptive radius sample box, and the radius of the adaptive radius sample box can be adjusted; a bracket is fixedly arranged on the base; a micrometer is installed on the bracket, and is used to measure the expansion amount of the top of the expansion rock sample. The application has the effect of simple device structure, convenient use, and is suitable for the measurement of the lateral expansion rate of expansion rock samples with different radii.

The embodiment of the invention provides a device and a method for testing the expansion rate of a swellable alloy, and belongs to the field of expansion rate testing. The test device comprises: a reaction chamber comprising a sample chamber and a piston rod, the sample chamber having a hollow cavity for accommodating a swellable alloy, one end of the piston rod being in contact with the swellable alloy to move in response to the expansion of the swellable alloy; the electrochemical workstation comprises a counter electrode and a working electrode which are positioned in the reaction solution, the working electrode is fixed at the other end of the piston rod, and the electrochemical workstation is used for acquiring a resistance value between the working electrode and the counter electrode; and the processor is used for determining the expansion rate of the swellable alloy according to the resistance value acquired by the electrochemical workstation. The testing device can meet real-time monitoring of the expansion coefficient of the swellable alloy in the high-temperature and high-pressure environment, and can simply and efficiently measure the expansion coefficient of the swellable alloy in different set temperature and set pressure environments.

The invention discloses a design method and system for a blade profile and an impeller system of a multi-blade centrifugal fan. The design method comprises the following steps that (1) basic structure parameters of an impeller are primarily selected based on target parameters; (2) according to the inner diameter D1, the outer diameter D2, the inlet angle beta1A and the outlet angle beta2A of the impeller, a basic single-arc blade molded line C is generated, and model selection is checked through numerical simulation; (3) the molded line shrinkage and expansion rate b is specified, and a logarithmic spiral line S: # imgabs0 # is generated to serve as a blade molded line; (4) the blade number Z and the blade width d are specified, the width of an impeller runner is calculated, the value of the parameter b is changed, the inward contraction or outward expansion rate of the curve is adjusted, and an impeller system containing a constant-speed blade channel or a constant-acceleration blade channel is obtained; and 5) verifying constraint conditions.

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.

The invention provides a preparation method of unequal-thickness glass, which comprises the following steps: carrying out first strengthening treatment on a glass substrate to obtain first pretreated glass, the glass substrate comprises a first part and a second part adjacent to the first part, and the thickness of the first part is smaller than that of the second part; performing first etching treatment on the first part subjected to the first strengthening treatment to thin the first part so as to obtain second pretreated glass, and after the first strengthening treatment and the first etching treatment, the volume expansion rate of the first part is smaller than that of the second part; performing second strengthening treatment on the second pretreated glass to obtain third pretreated glass; the third pretreated glass is subjected to second etching treatment to obtain unequal-thickness glass, the unequal-thickness glass comprises a first strengthened part obtained from the first part and a second strengthened part obtained from the second part, the thickness of the first strengthened part is smaller than that of the second strengthened part, and the peak-valley value of the surface of the first strengthened part is smaller than or equal to 0.1 mm. The invention provides unequal-thickness glass and foldable electronic equipment.