4results about How to "Guaranteed to run through" patented technology

The invention belongs to the technical field of coal bed gasification drilling and completion, and discloses a plug cone type fusible tube and a machining method.The plug cone type fusible tube comprises a supporting tube and a combustible plug cone, and a plurality of mounting holes are formed in the supporting tube; the combustible plug cones are inserted into the mounting holes in a one-to-one correspondence mode and fixedly connected with the supporting pipe, and the combustible plug cones are made of fusible alloy or fusible nonmetal. According to the plug cone type fusible tube, a coal seam can be effectively ignited after the combustible plug cone is combusted at high temperature, meanwhile, the supporting tube can prevent the coal seam from collapsing, it is guaranteed that an igniter safely withdraws, it is guaranteed that a gas channel is smooth after combustion, and the manufacturing cost is low.

The present invention relates to the technical field of mechanical processing equipment, and discloses a rotary sealing structure, including a transmission component and a sealing component, wherein the transmission component includes a main shaft, a bearing sleeved on the main shaft, and a bearing seat, the main shaft can be connected to a pneumatic chuck, and the main shaft is provided with a first passage and a second passage, one end of which can be respectively connected to the pneumatic chuck, and the other end of which can be respectively connected to the first annular groove and the second annular groove provided on the bearing seat. The sealing component includes a plurality of grid rings, and the plurality of grid rings are arranged one-to-one in a plurality of first sealing grooves on the bearing seat, and the first sealing grooves and the first annular grooves and the second annular grooves are arranged at intervals, so as to realize the sealing of the main shaft and the bearing seat, the first passage and the second passage, and the rotary sealing structure is simple and highly practical. The present invention also discloses a pneumatic chuck mechanism, including the above-mentioned rotary sealing structure and the pneumatic chuck, and its good sealing performance can ensure the clamping degree of the pneumatic chuck and the machining accuracy of the machine tool.

The invention relates to the technical field of building engineering construction, and discloses a climbing frame installation construction method which comprises the following steps: S1, selecting a cantilever layer from a building house, and enabling the cantilever layer to be located above the horizon; s2, a cantilever I-shaped steel platform is selected, the cantilever I-shaped steel platform is fixed to the cantilever layer, and the cantilever I-shaped steel platform is located outside the building house; and S3, the cantilever I-shaped steel platform supports the climbing frame, and the climbing frame is fixed to the building house. According to the installation and construction method of the climbing frame, the climbing frame can be installed more rapidly, simply and conveniently, meanwhile, the problem that construction of other working procedures of the basement outer wall cannot be conducted in the installation process of the climbing frame is solved, and peak shifting construction of climbing frame installation and remaining working procedures of the basement outer wall is achieved.

This invention relates to an ordered macroporous polysaccharide microsphere chromatographic medium and its preparation method, belonging to the field of chromatographic medium technology. The preparation method includes the following steps: dissolving polysaccharide powder in an alkaline urea solution to obtain a polysaccharide solution; adding regular calcium carbonate whiskers as pore-forming templates to the polysaccharide solution and stirring to obtain a mixed solution; adding the mixed solution as an aqueous phase to an oil phase, forming a water-in-oil emulsion under the action of a surfactant; emulsifying for a period of time, solidifying the microspheres using an acid regeneration method and removing the calcium carbonate whiskers; using the length of the calcium carbonate whiskers as a sieving standard, sieving using a filter screen with a pore size equal to the length of the calcium carbonate whiskers; the microspheres with a size smaller than the length of the calcium carbonate whiskers are the ordered macroporous polysaccharide microsphere chromatographic medium. Compared with the prior art, the preparation process of this invention is simple, the pore structure is interconnected and uniform, and there are no narrow pore throats, significantly improving mass transfer performance, and it is expected to serve as a high-performance chromatographic medium platform-type microsphere.