41results about How to "Uniform crack" patented technology

The invention provides a method for manufacturing reconstituted wood. Rotary cut is carried out on the raw wood for preparing a veneer or a veneer strip, defibering is carried out on the veneer, the forming points and/or wood bunch shades or wood bunches of striation crack are formed along the natural texture of wood on the veneer, then dipping, drying and hot pressing for molding the reconstituted wood are carried out. Compared with the prior art, the method of the invention solves the problem that wood bunch is irregular; the rate of utilizing wood and production efficiency of wood bunch are improved; defibering process is simplified and energy consumption for defibering is lowered. The process facilitates the cracks on the wood bunch shades and wood bunches to be very even and facilitates the dipping of wood bunch shades or wood bunches to be very even in the following dipping process; the product problems such as warp, deformation, jump fibre, and the like, are overcome, which are aroused by uneven defibering in making wood bunches from raw wood directly in the prior art, and the boards that the surface is very smooth, the mechanical performances such as stiffness and intensity, and the like, are higher than the raw material itself are made, therefore the fast-growing forest wood with worse performances and wider source can be made into the products of reconstituted wood which can compare beauty with noble hardwood.

The invention discloses a liquid-phase CO2 phase change cracking permeability-increasing grid type gas extraction method for a low-permeable coal seam. The method comprises the following steps that (1) a bottom board passage is constructed; (2) crossing drilling construction is carried out in the bottom board passage; (3) liquid CO2 phase change cracking is carried out; (4) gas of coal seams of a coal roadway strip and a recovery area is pre-drained with crossing drill holes; (5) the extraction effect of the coal roadway strip area is detected; (6) coal roadway construction is carried out; (7) hole drilling down the seam is carried out; (8) gas of the coal seam in the recovery area is pre-drained with grid type drill holes; and (9) the extraction effect of the recovery area is detected. The method can improve the quantity of drainage of gas of underground coal mine, achieve the purpose of rapidly eliminating danger of outburst for high-gas low-permeable outburst coal seams, prevent coal and gas outburst accidents and guarantee safety production of the underground coal mine.

The invention relates to a precast concrete member connected by a straight thread and a pier head lock anchor grouting sleeve, and a method for assembling the precast concrete member, belonging to the technical field of constructional engineering assembly concrete structures. The method of connecting by the straight thread and the pier head lock anchor grouting sleeve is adopted; one end of a reinforcing steel bar is processed into the straight thread (6), and the other end of the reinforcing steel bar is processed into a pier head (5); the inner wall of the end with smaller diameter of a connecting sleeve is processed into a thread (9) which is connected with the reinforcing steel by the straight thread (6) and is used for transmitting force; the inner wall of the end with larger diameter of the connecting sleeve is processed into a thread (16) which is connected with a matched plug ring (10) by an external thread (17); after grouting is carried out through a grouting hole, the original way that the tensile force of the reinforcing steel bar of a prefabricated part connected by grouting is transmitted mainly by bonding is changed by the reinforcing steel bar through lock anchor extrusion and bonding force transmission among the pier head of the reinforcing steel bar, the plug ring, grouting material and the sleeve. The safety and economical efficiency of the connection of the novel precast concrete member are improved.

The invention discloses an environment-friendly water-based crack lacquer and an application method thereof. The n environment-friendly water-based crack lacquer comprises a water-based crack primer and a water-based crack finishing coat; the water-based crack primer is prepared from such components in percentage by weight as 20-30% of water-based epoxy modified acrylic resin, 0.5-1.5% of neutralizer, 10-20% of curing agent, 10-20% of cosolvent, 0.01-0.1% of flatting agent, 0.01-0.1% of defoamer, 0.01-0.1% of catalyst, 10-20% of water-based color paste and 10-30% of water; the water-based crack finishing coat is prepared from such components in percentage by weight as 60-80% of styrene-acrylic emulsion, 1-2% of neutralizer, 15-40% of water-based color paste and 0.01-0.1% of water-based crack agent. Compared with the correlation techniques, the environment-friendly water-based crack lacquer has the beneficial effects of high environmental friendliness and safety performance, excellent decoration effect and strong adhesion.

The invention discloses a prefabricated concrete member, an assembled concrete member and a fabricating method through straight thread and nut locking anchor grouting sleeve connection and belongs to the technical field of assembled concrete structures of constructional engineering. A method of straight thread and nut locking anchor grouting sleeve connection is applied, one end of a reinforcing steel bar is machined to form a straight thread (6), a nut (5) is connected with the other end of the reinforcing steel bar, the inner wall of a small-diameter end of a connecting sleeve is machined to form a screw thread (9) so as to be connected with the reinforcing steel bar through the straight thread (6) to transmit force, the inner wall of a large-diameter end of the connecting sleeve is machined to form a screw thread (16) so as to be connected with a matched blocking ring (10) through an external thread (17), after grouting through a grouting hole (8), the pulling force of the reinforcing steel bar is transmitted through locking anchor extruding and cementation among the reinforcing steel bar nut, the blocking ring, a grouting material and the sleeve, and traditional methods that pulling forces of reinforcing steel bars of prefabricated members through grouting connection are mainly transmitted through cementation are changed. According to the prefabricated concrete member, the assembled concrete member and the fabricating method through straight thread and nut locking anchor grouting sleeve connection, the connection of the novel prefabricated concrete member is improved in terms of safety and economical efficiency.

The invention discloses a high-strength high-toughness high-modulus deformed magnesium alloy and a preparation method thereof. The high-strength high-toughness high-modulus deformed magnesium alloy iscomposed of the following elements of, by mass, a% of Al, b% of one of La, Ce and Pr or b% of a mixture of several of the La, the Ce, the Pr, c% of Mn, a total of d% of one or several of RE rare earth elements Gd, Y, Sm, Nd, Er, Eu, Ho, Tm, Lu, Dy and Yb, a total of e% of one or several of Si, Ge, Ca, Li, Sn, Zn and Sb, a total of less than 0.2% of impurities and the balance Mg, wherein the a, the b, the c, the d and the e meet the requirements that the a is greater than or equal to 3.5 and less than or equal to 6.0, the b is greater than or equal to 0.5 and less than or equal to 4.5, the c is greater than or equal to 0.01 and less than or equal to 1.0, the d is greater than or equal to 0.01 and less than or equal to 2.5, and the e is greater than 0 or less than or equal to 4.0. A raw material are preheated, melted and cast to obtain a magnesium alloy cast ingot, the magnesium alloy cast ingot undergoes hot extrusion or hot forging or hot rolling to obtain the magnesium alloy deformedpiece, the method is simple, the process stability is good, and the controllability is high.

The invention provides a precast concrete component and an assembly concrete component connected with a pier head locking anchor grouting straight sleeve and a production method thereof and belongs to the technical field of construction engineering assembly concrete structures. A method of sleeve connection based on extrusion and binding force transfer is adopted and a pier head (5) and a pier head (6) are machined at two ends of steel bars respectively; the sleeve inner diameter of one end of a connecting sleeve (7) is smaller than the outer diameter of the corresponding end of steel bar pier head (6); the inner diameter of the other end of the connecting sleeve is large and the other end of the connecting sleeve is provided with threads; a blocking ring (10) is connected with the connecting sleeve, wherein the inner diameter of the blocking ring (10) is smaller than the outer diameter of the corresponding end of steel bar pier head (5); the locking anchor extrusion and binding force transfer among the steel bar pier heads, the blocking ring, the sleeve and grouting materials is utilized through the steel bars due to the sleeve grouting and accordingly the mode that the steel bar tension of the previous grouting connection precast component is mainly transferred through bonding is changed. According to the production method, the safety and the economy of the connection of the novel precast concrete component are improved.

The invention relates to a walnut shell breaking device. Lifting plates in an angle with a belt are fixed on the surface of the belt of a vertical lifting device at intervals, and the rear end of a horizontal conveyor belt is overlapped on the vertical lifting device. A push plate feeding machine is arranged before the horizontal conveyor belt and is parallel to horizontal conveyor belt, and push plates are arranged on the surface of a chain of the push plate feeding machine at intervals. An oblique-opening leakage groove is horizontally arranged below the push plate feeding machine; an oblique-opening leakage port of a gradually increasing width is formed on the bottom of the oblique-opening leakage groove, and a shell breaking mechanism is arranged below the oblique-opening leakage groove. Walnuts correspondingly fall into the shell breaking mechanism through the oblique-opening leakage port according to the size, and are ground under the action of a fixed knife and a movable knife, so that shells of the walnuts are broken. The sorting and the shell breaking of walnuts are integrated on one device, the production efficiency is increased, the shell breaking speed is quicker, equidistant teeth are uniformly distributed on the working surface of the movable knife and corresponded with the fixed knife, so that the walnuts are more ground, and furthermore uniform cracks are more easily formed on the walnut and high kernel exposure rate is guaranteed.

The invention discloses a preparation method of plant modified water-based crackle lacquer and belongs to the technical field of coating preparation. Lotus root and soybeans are fermented, a fermented supernatant fluid is obtained and then mixed with garcinia cambogia juice to obtain a mixture; then the mixture and natural resin of peach gum are mixed for modification to obtain a product, and epoxy resin is modified under the action of a microorganism through the product to obtain modified epoxy resin; and finally, the modified epoxy resin, water-based color paste and other raw materials are blended to obtain base coat, finishing coat is prepared through fluorocarbon resin, and the crackle lacquer can be obtained through combination of the base coat and the finishing coat. The epoxy resin is modified through amino acid in the fermented fluid of the lotus root and soybeans and hydroxycitric acid in garcinia cambogia under the action of the microorganism, various active groups in the epoxy resin are added, the base coat is prepared through the modified epoxy resin so that the chemical bonding force between the crackle lacquer and a base body can be increased, accordingly the attachment force of the crackle lacquer is increased, after curing of the base coat, excellent alkali resistance and attachment force are achieved, extremely low VOC and good flexibility are also achieved, the phenomenon that a lacquer face falls off after cracking of the crackles is avoided, and the application prospects are wide.

The invention relates to the technical field of flexible sensors, and particularly discloses a resistance-type flexible carbon fiber strain sensor and a manufacturing method thereof. The structure of the resistance-type flexible carbon fiber strain sensor comprises an upper protection layer, a sensitive element and a lower protection layer which are sequentially stacked from top to bottom; wires are respectively connected with left and right ends of the sensitive element; and the sensitive element is made of carbon fiber prepreg cloth. The resistance-type flexible carbon fiber strain sensor has the advantages of strong elasticity, high sensitivity, strong controllability, strong anti-interference capability, adjustable sensitivity and working range, and low manufacturing difficulty.