37results about How to "Small block" patented technology

A turbine airfoil has a suction side wall and a pressure side wall of an airfoil cavity, through which a cooling fluid flows for cooling of the side walls. The suction side wall has one or more protrusions extending therefrom into the airfoil cavity. The protrusions are arranged such that: a number of the one or more protrusions on the suction side wall is higher than a number of protrusions on the pressure side wall; and / or a protrusion density on the suction side wall is higher than a protrusion density on the pressure side wall, and / or a total protrusion surface area on the suction side wall is larger than a total protrusion surface area on the pressure side wall, so that the heat transfer from the suction side wall to the cooling fluid is higher compared to that of the pressure side wall during operation of the turbomachine.

The invention relates to a method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power, which solves the problem that a relatively hard and complete roof coal seam, particularly a coal seam tightly attached to an upper rock body, is difficult for top coal caving, large in coal falling lumpiness and not high in mining efficiency. The method comprises the following steps of: drilling advanced boreholes in a roof coal body to a coal rock boundary surface on a mining working surface by utilizing a drilling machine; extending a high-pressure water pipe in the boreholes; and cutting a plurality of subhorizontal semicircular transverse slots by utilizing the impact force of high-pressure water from top to bottom in the top coal. A plurality of yielding regions are formed by the boreholes in linear distribution in the roof coal body, the mechanical conditions in the coal body are changed, the hard and complete coal body is promoted to be deformed and broken under the effect of advanced concentrated stress, and a plurality of cracks are generated; the coal-rock and coal-coal contact areas are reduced through the transverse slots, and the coal body on the boundary surface is further extruded under the effect of roof high stress, so that the coal body is broken, the adhesive power is lost, manual layering is achieved, and coal is convenient to fall. The method is simple and quick, high in operability and good in timeliness, the coal mining speed can be efficiently increased, and the mining efficiency of the top coal is improved.

The invention discloses a tunneling blasting method comprehensively utilizing the detonator short time difference and an empty hole vibration reduction technique. The center line of a tunnel face of ablasted tunnel serves as the boundary, and the blasted area is divided into a left region and a right region, wherein the left region and the right region are symmetrical to each other; the two sidesof the center line are provided with a plurality of slotting holes, auxiliary holes and peripheral holes correspondingly, wherein the slotting holes, the auxiliary holes and the peripheral holes aresymmetrical to one another, a vibration reduction hole linear array is arranged on the ground between the blasted area and a building, and in the implementation process, the same row of holes are blasted hole by hole in a symmetrical and delayed manner. Hole-by-hole sequential blasting is performed through electronic detonators, and targeted to different types of blastholes, through the setting ofthe optimal delay time of the electronic detonators, vibration waves transferred to the ground interfere with one another and are counteracted partially; and meanwhile, vibration reduction holes of optimized design are formed on the ground, and 50% of blasting vibration can be effectively lowered. Through the combined measure, the blasting effect of a constructed smooth surface can be guaranteed,the defect that traditional smooth surface blasting is large in vibration can also be overcome, and finally influences on the surface buildings are reduced.

The invention discloses a jack device for a stamping coke oven system and the stamping coke oven system. The jack device comprises a mounting bracket fixedly connected with a preset assembly in the tamping coke oven system; a telescopic assembly fixedly arranged on the mounting bracket, wherein the telescopic assembly further comprises a fixing element fixedly connected with the mounting bracket,and a movable element capable of reciprocating relative to the fixing element; and a jack assembly which is fixedly connected with the movable element contained by the telescopic assembly, and can perform a jack operation on stamping molded briquettes in the stamping coke oven system when the movable element reciprocates relative to the fixing element. The jack device has a wide range of application scenes, can be applied for a long period of time, and is convenient in operation, and can easily reduce the lumpiness of coke.

The invention discloses a detonator short-interval detonation blasting method for reducing ground blasting vibration. The blasting area is divided into two symmetric areas on the left and the right with the center line of a tunnel face of a blasting tunnel as the boundary. The two sides of the center line are provided with a plurality of symmetric underholing holes, auxiliary holes and peripheralholes, wherein the underholing holes are formed in the center area of the tunnel face, the peripheral holes are formed in the periphery of the tunnel face, the auxiliary holes are formed between the underholing holes and the peripheral holes, and during implementation, in the same row, hole-by-hole symmetric delayed detonation is conducted. According to the detonator short-interval detonation blasting method, electronic detonator hole-by-hole sequential detonation is adopted, for different types of cannon holes, vibration waves transmitted to the ground interfere with one another and are partially offset through setting of the optimal delay time of electronic detonators, the blasting effect of the construction smooth surface can be guaranteed, the defect that traditional smooth surface blasting vibration is large can be overcome, and influences on ground buildings are finally reduced.

The invention discloses a hydraulic fracturing underground construction method for a high-position roof of a coal seam group, which belongs to the field of coal mining; the steps include: confirming the high-position roof of an upper coal seam; calculating the size of the suspended roof of the high-position roof and the bearing area and rupture area of ​​the upper coal pillar; Determine the coordinates of the fracturing point and construct the L-shaped fracturing drilling; complete the hydraulic fracturing construction of the high-level roof; wherein, the drilling construction and hydraulic fracturing parameters vary with changes in mine geological conditions; through the implementation of the present invention, It can reduce the overhang length and broken block degree of the high-level roof, alleviate the strong dynamic load pressure on the working face and reduce the risk of roof cutting and press frame accidents. It is an economical, reasonable, safe and feasible hydraulic fracturing underground construction method.