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55results about How to "Avoid decompression" patented technology

Device for measuring pressure of finite filling retaining wall under different displacement modes and testing method

InactiveCN108252340APressure controllableWide range of pressure changesFoundation testingRigid wallStressed state
The invention discloses a device for measuring pressure of a finite filling retaining wall under different displacement modes, which comprises a test box body and a box type framework; the test box body comprises a moving retaining wall and a fixing retaining wall, an upper part and a lower part of the moving retaining wall are connected with screws; an upper end and a lower end of the moving retaining wall are further provided with dial indicators; one side in opposite to the moving retaining wall is provided with the fixing retaining wall, two side walls of the test box body are rigid box bodies; the rigid wall bodies are fixedly connected with the box type framework; a fixing plate for fixing the screws is further arranged on the box type framework, a thread hole matched with the threadof the screws is arranged on the fixing plate; inside of the test box body is further provided with a pressure detecting device. The invention provides a test method. The test method can simulate thesoil body damage mode and the retaining wall soil pressure of the moving retaining wall under different displacement modes; several soil pressure detecting devices are arranged on the retaining wall;different nature stress states of the finite filling can be simulated, the soil pressure of the finite filling is measured in real time; the device is simple in structure and convenient to operate.
Owner:CHANGAN UNIV

Control valve for electro-hydraulic suspension systems of small-and medium-horsepower tractors

The invention belongs to the field of electro-hydraulic suspension systems and discloses a control valve for electro-hydraulic suspension systems of small-and medium-horsepower tractors. The control valve comprises a valve body, an overflow valve, a check valve, a two-position two-way electromagnetic valve, a two-position three-way electromagnetic valve, an oil outlet A, an oil inlet P, an oil return port T and a pressure testing oil port, and the overflow valve, the check valve, the two-position two-way electromagnetic valve, the two-position three-way electromagnetic valve, the oil outlet A,the oil inlet P, the oil return port T and the pressure testing oil port are mounted on the valve body through insertion. The valve body is internally provided with oil passages communicated with valve part oil ways, the oil inlet port P is connected with an oil cylinder, the pressure testing oil port is connected with a pressure meter and a switch, the oil outlet A is connected with a hydrauliccylinder, and the oil return port T is connected with an oil tank. The control valve has advantages of cost saving, compact structure, high response speed, convenience in connection with external oilways and hydraulic cylinders and convenience in electronic control.
Owner:NANJING AGRICULTURAL UNIVERSITY

Constant-force tensioning mechanism and tufting machine

The invention relates to a constant-force tensioning mechanism and a tufting machine, and relates to the technical field of tufted carpet processing. The constant-force tensioning mechanism comprisesan air pump, a main pipe, branch pipes, pistons and a first pulley, wherein the air pipe communicates with an air outlet port of the air pump; a plurality of the branch pipes are arranged and communicate with the main pipe separately; the branch pipes are arranged in a manner of being uniformly distributed in the length direction of the main pipe; a plurality of the pistons are also arranged and form one-to-one correspondence with the branch pipes; the diameter of each piston is adaptive to the diameter of the corresponding branch pipe; each piston is slidably connected with the correspondingbranch pipe in the length direction of the corresponding branch pipe; the first pulley is connected to one end away from the main pipe, of each piston; and a fiber yarn is wound on the peripheral surface of the first pulley and in rolling connection with the first pulley. The tufting machine comprises a frame, a loading mechanism, a tufting mechanism, an unloading mechanism and the constant-forcetensioning mechanism. According to the constant-force tensioning mechanism and the tufting machine, under the action of a tufting needle and the constant-force tensioning mechanism, the fiber yarn isuniformly pulled into ring-shaped tufts on a base cloth, so that the aesthetic feeling of a tufted carpet is improved, and the durability of the tufted carpet is improved.
Owner:山东容润丰地毯有限公司
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