428 results about "Counter pressure" patented technology

Floor board (1) comprising a wood fibre based core (6) such as HDF, a thin surface layer (5) such as wood veneer, and a sub layer (6a) between the surface layer (5) and the core (6). The sub layer (6a) comprises wood fibres (14) and an uncured binder (19) and is applied on the core (6) as a powder. The layers (5, 6a) are connected to the core (6) and embossed in register by heating and pressing, the uncured sub layer (6a) behaving similar to a paste or a liquid substance and creating a uniform counter pressure under the thin surface layer (5), thus providing an easier forming of deep and sharp embossing without damaging the surface layer (5).

The invention discloses an indoor grouting testing device under simulation of a complex stress effect and a testing method thereof. According to the invention, a rock-soil sample is wrapped with a rubber membrane, and is provided with an upper permeable stone and a lower permeable stone on the upper surface and the lower surface thereof respectively; the upper permeable stone and the lower permeable stone are arranged in a closed surrounding pressure room; the upper permeable stone is provided with a pressurization plug; the pressurization plug is connected to an axial pressurization device through a force transfer rod; a surrounding pressure pipe is communicated with the surrounding pressure room, and the outer end of the surrounding pressure pipe is connected with a surrounding pressure system; a counter pressure pipe is connected with the upper permeable stone, and the outer end of the counter pressure pipe is connected with a counter pressure system; and a grouting filter pipe, placed in the axes of the rock-soil sample, is connected with equipment, such as a grouting pump, a slurry barrel and the like through grouting pipes. Through truly simulating the coupling effect between deep complex stress and underground water pressure, the slurry dispersion radius in rock-soil body grouting and the function relationship between the osmotic coefficient value of a grouted stone body and the related parameter are obtained. The device and the method shorten the time needed by tests, and achieve effects of convenience, reliability and accuracy.

An apparatus for continuous closed-circuit consecutive sequential desalination of a salt water solution by reverse osmosis that comprises a closed circuit system comprising one or more desalination modules having their respective inlets and outlets connected in parallel by conducing lines, each of desalination modules comprising of one or more membrane elements, a pressurizing device for creating counter pressure to enable reverse osmosis desalination and replacement of released permeate by fresh, a circulation system for recycling the desalinated solution through the desalination modules, a conducting line systems for permeate collection from the desalination modules, a conducting line system for removing brine effluent a valve system to enable periodic discharge of brine from the closed circuit without stopping desalination, and monitoring and control systems to enable continuous closed circuit desalination of desired recovery proceed in consecutive sequential steps under variable or constant pressure conditions.

A clear view cannula is described that includes a first tube, a second tube and a counter-pressure ring. The tubes are concentric, adjoined and define a longitudinally aligned aperture. The cannula has a first position for penetration or removal from a patient and a second position in which a shield structure is deployed within the patient. The ring provides a counter-pressure force that opposes the force applied by the shield structure in the second position and stabilizes the angular position of the cannula in the body of the patient. Detents in the tubes define the first position and the second position of the cannula and limit the travel between the tubes.

Composite sandwich panels that include a core having a permeable body that is sandwiched between two skins. An internal barrier is located between the skins and the core to provide an impermeable chamber surrounding the permeable core. The chamber is pressurized during formation of the panel to provide an interior counter pressure against the mold/press used to form the panel. The counter pressure applied by the chamber reduces the amount of voids in the skins and improves the surface finish of the skins. In addition, the impermeable material remains within the finished panel to provide an internal barrier surrounding the core.

The invention relates to a counter-pressure casting process for ZL424 aluminum alloy castings. The process includes the steps: (1) alloy burdening; (2) using secondary refining and intermediate purifying for smelting alloy; (3) using a counter-pressure casting method for preparing ZL424 aluminum alloy castings; (4) cleaning the ZL424 aluminum alloy blank castings prepared at the step (3) before heat treatment; (5) checking the ZL424 aluminum alloy blank castings subjected to heat treatment. Blank castings prepared by the counter-pressure casting process overcome defects of ZL424 aluminum alloy castings obtained by traditional gravity casting methods, internal pinholes, microscopic shrinkage porosity and microcracks of castings are eliminated, and chemical component acceptability, mechanical performance and compactness of the castings are improved. In addition, the process has the advantages of high efficiency, high casting yield, low manufacturing cost and the like.

The invention relates to the preparation method of a dried poultry egg which is characterized in that 2 to 5 portions weight of agar powder and 0.1 to 1 portions weight of konjak gum are dissolved in 10 to 20 portions weight of the distilled water and stir the mixture to mix well; then, the stirred and mixed poultry egg plup of 80 to 100 portions weight is poured into the mixture and the stirring is made under the temperature of 70 to 80 DEG C; the stirred and mixed liquid is poured into the anti-viscous mould and is steamed. The sopping is made according to the preparation method and is heated to 80 to 90 DEG C. After being taken out from the mould, the steamed material is put into the sopping, steeped under the temperature of 80 to 90 DEG C in 1 to 2 hours. Then the dried poultry egg is taken out and is dried under the temperature of 55 to 65 DEG C in 20 to 60 minutes. After being dried, the poultry egg is cut into different shapes and sizes according to different needs; then the vacuum packaging is made. The packaged product is made counter-pressure sterilization under the high temperature of 100 to 121 DEG C in 10 to 60 minutes. After being made stepped cooling, wiping water on the surface, further air-drying, sticking label, printing code and packaging, the product is produced finally.

The splicing device comprises two heads (41A, 43A; 41B, 43B), each of which has: a roller (33A; 33B) associated with a clamping bar (93A; 93B) to hold between said roller and said clamping bar an initial edge (L) of the second web material; a counter-pressure member (53A; 53B) cooperating with said roller to press said first and second web materials against each other; and a cutting member (67A; 67B).

A closing apparatus for closing preferably bag-type packaging units by compression, which units have regions of differing thickness along the package opening to be closed, such as square bottom bags for instance, in particular made of coated or uncoated paper, paperboard, plastic, film, and/or woven material, which packaging units have at least one suitable sealing surface that is integrated in or applied to the material for permanent bonding to a surface that is adjacent to or opposite and pressed against the material, wherein the closing apparatus has a pressing device with at least one pressure device and at least one counter-pressure device between which the packaging units can be compressed, preferably with the application of heat, in the region of their sealing surface(s). In order to achieve a uniformly durable closure, the pressure device and the counter-pressure device have zones of different pressure and/or different temperature along the package opening to be closed.

The invention discloses a high strength corrosion resistant rare earth cast magnesium alloy and a preparation method thereof, which is characterized in that: the magnesium alloy comprises the following components according to the weight percentage: 1.8 to 4.0 percent of Nd, 1.0 to 2.0 percent of Gd, 0.2 to 0.8 percent of Zn, 0.4 to 1.0 percent of Zr, 0.0 to 0.8 of Ca, not more than 0.02 percent of total content of impurity elements of Fe, Cu and Ni, and the balance of Mg complemented to 100 percent; and the preparation method comprises the following steps of: melting pure magnesium, adding Mg-Nd intermediate alloy, Mg-Gd intermediate alloy, Mg-Ca intermediate alloy and commercial pure Zn in sequence, heating up to 760 DEG C to 785 DEG C after the mixture is totally melted, adding Mg-Zr intermediate alloy, stirring fully and evenly after the Mg-Zr intermediate alloy is melted, standing for 10 to 20 minutes, removing dross, and then casting ingots or casting the cast products at the temperature of 720 DEG C to 750 DEG C. The cast magnesium alloy has the advantages of controllable melting process, appropriate cost, excellent mechanical property, corrosivity, good casting process property and the like; and the cast magnesium alloy can be used to manufacture various non-die casting magnesium alloy parts by adopting the processes of sand mold casting, low-pressure casting, counter-pressure casting or squeezing casting, etc.

The invention discloses a wedge-shaped draper-type press filter which consists essentially of a chassis, a pressing area, a driving device, a feeding device, a scrapper assembly, a deviation-rectifying device, a rinsing device and a water receiving device. The structure of the wedge-shaped draper-type press filter is characterized in that the pressing area is a wedge-shaped pressing area with an included angle more than zero degree but less than 15 degrees between an upper filter strip and a lower filter strip; the wedge-shaped pressing area is divided into an upper press area and a lower press area; respective tension band and filter strip of the upper press area and the lower press area are stacked and wrapped outside respective press roll in parallel; the tension band is stuck to the press roll and the filter strip is firmly stuck outside the tension band; the press rolls of two press areas are arranged in a counter pressure way. The draper-type press filter of the invention adopts a single wedge-shaped press area, changes press dehydration technique of the prior art that adopts a plurality of press rolls to enwind and operate in snaking way, realizes that the press roll operates press dehydration in a counter pressure and liner way, greatly reduces the abrasion of the filter strips caused by tension, effectively prolongs the service life of the filter strips and can reduce operation energy consumption of the press filter.

The invention relates to a simple creep test device of rocks and a test method thereof, which effectively overcome the defects of complex systems, high cost, complicated test processes and high test cost of the test device and effectively solve the problem of obtaining a stress-strain curve in uniaxial and triaxial tests of rocks. The device has the structural characteristics that a reaction frame of a test platform comprises a base and a counter-pressure strut on the base, wherein the upper part of the counter-pressure strut is provided with a top beam; the lower part of the top beam is provided with an axial pressure actuating system of specimens; the axial pressure actuating system of specimens is connected with an external hydraulic control system through an oil conveying pipe; the lower part of the axial pressure actuating system of specimens is provided with a pressure sensor; the pressure sensor is connected with an external automatic data collecting system; and the inside of the counter-pressure strut is a triaxial pressure chamber of a pressure-confined actuating system of specimens. The invention has the advantages of simple structure, novelty, peculiarity, easy operation, low cost and simple test processes, can be effectively used in uniaxial and triaxial creep tests of rocks to obtain the stress-strain curve, provides a scientific basis for engineering construction, and has significant economic and social benefits.

The invention involves a counter-pressure chemical foaming high speed injection moulding shaping method. The invention provides a method which utilizes injection moulding shaping machine equipment, and dies, general gas energy, plastic raw materials and other system resources comprehensively, produces thick-wall plastic-foam product high speed and high effectively. The invention first closes the die and injects gas into die cavity, then injects molten material into die cavity, the welding fluid is full of die cavity after inner foaming, the molten material surface is closed to the metal wall-surface of die cavity, the molten material in die cavity is solidified and shaped after cooled, then opens the moving mold and static mold, the plastic products are prepared which surface is smooth and dense and inner is distributed with uniform foam. The invention can eliminate or reduce the converging cave and warping deformation of product surface, reduces injection moulding pressure, thereby reduces the lock-mode pressure of injection machine; reduces equipment operating costs, thereby improves the size accuracy and strength of products, can reduces 15% ~ 35% raw material consumption effectively, products have higher mechanical property and weight proportion.

The invention relates to an oversized high-strength heatproof magnesium alloy ingot blank semicontinuous casting technique. The alloy comprises the following components by weight percent: 6-13% of Gd, 2-6% of Y, 0.3-0.8% of Zr and the balance of Mg and irremovable impurity elements. The technique comprises the steps of melting magnesium ingots, adding solvents, adding alloy elements, refining, degassing, removing impurities, preserving heat and standing, and semicontinuously casting under the low casting speed by using a counter-pressure gas fluid-guiding method at low temperature and under low cooling speed. In the invention, technique parameters such as the casting temperature, the cooling speed, the ingot pulling speed, the inner liquid level height of a crystallizer, and the like are controlled to obtain the oversized high-strength magnesium alloy ingot blank with flat and smooth surface, refining and uniform tissue and no solute segregation, and the diameter of the ingot blank is from 220 mm to 505 mm. The length of the ingot is 1000-5000 mm. The invention meets the requirements for the oversized ingot blank required by high-strength heatproof magnesium alloy materials in the fields of aerospace, information electronics, communications and transportation, and the like.