50results about How to "Short contact distance" patented technology

The invention discloses a multifunctional ball endmill which includes a cutting portion, an assembly and disassembly portion and a connecting portion for the cutting portion, the assembly and disassembly portion. The cutting portion includes an inner ball cutting edge and at least one pair of outer ball cutting edges. The inner ball cutting edge and a central shaft are cross and are rotatably symmetric with respect to the central shaft, two outer ball cutting edges in each pair of outer ball cutting edges are rotatably symmetric with respect to the central shaft, a radial spacing is reserved between the outer ball cutting edges and the central shaft, a spherical surface formed by the inner ball cutting edge rotating with respect to the central shaft and a spherical surface formed by the outer ball cutting edge rotating with respect to the central shaft are cross, the spherical surface radius of the inner ball cutting edge is r, and the spherical surface radius of the outer ball cuttingedge is R, meeting: 5R<=r<=15R. The spherical surface radius of the inner ball cutting edge is far greater than that of the outer ball cutting edge, and when performing cavity large feeding cutting or flat surface copy milling, the endmill has a low radial load and high cutting efficiency.

The invention relates to a device for producing camphor through continuous gas-phase dehydrogenation of isoborneol, comprising a feeding pump, a vaporizer, a heat-exchanging radial flow dehydrogenation reactor, a continuous rectification tower, a sublimation kettle and a desublimation chamber; The feed pump is connected to a liquid storage tank containing the hydrolyzed isoborneol organic solvent solution, and a first control valve is provided on the connecting pipeline between the feed pump and the liquid storage tank. This invention overcomes the shortcomings of the existing isoborneol continuous dehydrogenation method that when the liquid phase enters the fixed bed reactor to prepare camphor, it may cause erosion of the catalyst and affect the service life of the catalyst. It performs dehydrogenation reaction by vaporizing the isoborneol raw material and especially A heat-exchanging radial flow dehydrogenation reactor adapted to it is designed, which has the advantages of continuous production, little impact on the service life of the catalyst, more reasonable distribution of reaction materials, and can greatly improve the production efficiency of the catalyst.

The invention discloses an integrated manufacturing material for an automotive glass lifter guide rail and a manufacturing method of the material. The material is prepared from 40-55 wt% of long glass fibers and the balance pure polypropylene. The integrated manufacturing material for the automotive glass lifter guide rail is in a columnar particle shape, the interiors of columnar particles are of Swiss-roll-shaped lamination structures, the lamination structures are formed by alternately rolling mixing blanketing layers and pure polypropylene layers, and the mixing blanketing layers are formed in the mode that after the long glass fibers and pure polypropylene fibers are mixed, wet-method deposition is conducted. The prepared particle material can quickly form a stable three-dimensional space structure in the injection molding process and is not easily influenced by the rotation speed of a screw of an injection molding machine, the long glass fibers are not easily broken, the mechanical property of a finished product is obviously improved, through the mixing blanketing layers and the lamination structures, the difficulty of an impregnation technology can be lowered, and the impregnation effect is improved. Through a needling technology, the stability of the mixing blanketing layers in the processing process can be obviously improved.

The invention discloses a balanced heating type resistance furnace, which belongs to the field of electric furnaces. A balanced heating type resistance furnace includes a resistance furnace body. There are multiple uniform temperature adjustment holes in the temperature plate, and multiple air uniformity holes connected to the uniform temperature adjustment holes are opened in the partition uniform temperature plate. Air drum type support cells are arranged in the uniform temperature adjustment holes, which can pass through the air. The role of the drum-type support bag and the heat radiation plate is to conduct contact heat conduction and partition heat radiation to the heat generated by the electric heating element to improve the heat transfer efficiency of the electric heating element, and then conduct auxiliary heat conduction to the area where the material is shielded in the furnace, effectively improving The temperature balance in the furnace improves the heating efficiency of the resistance furnace body to the material, effectively improves the heating uniformity of the material and improves the smelting quality of the material, and at the same time reduces the energy loss of the resistance furnace body and improves the environmental protection of the resistance furnace body.