30results about How to "Avoid too large" patented technology

The invention relates to a rated pressure compression roller device. The device comprises a shell, two compression roller modules and two roller modules for guide, wherein the compression roller modules and the roller modules for guide are arranged in the shell, two roller modules are arranged, and the compression roller modules are located between the two roller modules; and each compression roller module comprises a compression roller, a swing arm limiting shaft and two swing arms, wherein the swing arm limiting shafts are fixed inside the shell, one ends of each two swing arms are connected through a swing arm shaft, grooves are formed in the other ends of each two swing arms, the two ends of each swing arm limiting shaft are located in the grooves in each two swing arms correspondingly, the two ends of each compression roller are rotationally connected with each two swing arms correspondingly, the compression rollers are located between the swing arm limiting shafts and the swingarm shafts, and swing arm thrust bearings are arranged between the swing arm shafts and the swing arms. Compared with the prior art, the compression rollers are fixed to the shell in a flexible suspension mode so that acting force with rated magnitude can be output, and the situation that in the working process, a person applies extra pressure to the rollers, so that a test piece is unevenly or excessively stressed can be avoided.

The invention discloses a CNC comprehensive machining dust suction nozzle. The dust suction nozzle comprises a CNC machine head assembly, a cutter handle used for machining is arranged on the lower portion of the CNC machine head assembly, a dust suction device assembly is further arranged on the CNC machine head assembly, and a dust suction nozzle assembly is arranged on the dust suction device assembly; through rotation and vertical adjusting of the dust suction nozzle assembly, comprehensive sweep clearing and recycling can be achieved; the dust suction nozzle is high in efficiency, in the process of workpiece machining, sweeps are generated along with rotation of a cutter, a rotation airflow is added on the dust suction nozzle and is opposite to the rotation direction of the cutter, the sweeps are gathered towards the center position of a dust suction opening, and the dust removal, sweep removal and recycling efficiency is greatly improved.

The invention discloses a method for determining the thickness of a side wall treatment layer in a coarse-grained soil penetration test. From the particle sieving and particle density test, the content of each particle size group, median particle size and particle density of coarse-grained soil are measured, and the representative particle size d of the sample is calculated; with the help of the maximum dry density and minimum dry density test of the sample, it is obtained The plane void ratio correction coefficient ξ under the actual void ratio e of the coarse-grained soil sample is used to calculate the stacking angle α reflected in the stacking model of equal-diameter circles on the plane, and finally determine the thickness h of the side wall treatment layer under the condition of the diameter D of the permeameter. The principle of this method is clear, the operation and calculation are simple, and the thickness of the side wall treatment layer can be accurately determined by conventional indoor geotechnical test methods, which provides a reasonable basis for the thickness of the side wall treatment layer for the coarse-grained soil permeability test.

The invention provides a compact type vacuum pump aiming to overcome the defect that as a pressure gage temporarily additionally installed on a vacuum pump and a drive circuit board used for driving a motor are directly installed on a vacuum pump case, damage is easily caused due to collision in the prior art. The compact type vacuum pump is fixedly provided with a gas-pressure meter which can monitor the gas pressure in a pumped container in real time, a brushless direct current motor is used as a drive motor of the vacuum pump so that the performance of the vacuum pump can be improved, at the same time, a case of the vacuum pump is provided with a protection cover used for protecting the gas-pressure meter and a drive circuit board, damage to the gas-pressure meter and the drive circuit board due to collision in the use process is prevented, the structure is compact, and the vacuum pump is convenient to carry.

The invention relates to the technical field of rolled steel, in particular to a system for preventing a flying shear back-end crop from being too big. The system comprises a roller way, a first hot metal detector, a second hot metal detector, a pyrometer, a flying shear drive unit, a flying shear and a controller. The first hot metal detector, the second hot metal detector and the pyrometer are arranged above the roller way; the second hot metal detector and the pyrometer are arranged on the downstream of the first hot metal detector; the flying shear is arranged at the tail end of the downstream of the roller way; the flying shear drive unit is connected with the flying shear and drives the flying shear to act; and the first hot metal detector, the second hot metal detector, the pyrometer and the flying shear drive unit are connected with the controller. The system for preventing the flying shear back-end crop from being too big provided by the invention can prevent the flying shearback-end crop from being too big, and the occurrence of the phenomena of waste push and cancel closedown caused by the too big back-end crop is reduced.