48results about How to "Good hole forming effect" patented technology

The invention provides a preparation method of porous three-dimensional silk fibroin material, comprising the following steps of concentrating a silk fibroin solution, and manufacturing a bracket by the processed silk fibroin solution through a salting out method. By utilizing the self-assembling behaviors of silk fibroin, a secondary structure of the silk fibroin is improved. Compared with other methods of obtaining porous brackets, not only can the pore-forming property be good but also the inner walls of pores are in a very obvious fine structure.

The invention discloses a drill rod with functions of hole protecting, pressure relief and internal slag discharging. The drill rod comprises hollow rod bodies, flow injecting pipes coaxially arrangedin the rod bodies, and supporting pieces connecting the rod bodies with the flow injecting pipes; slag discharging channels are formed between the inner walls of the rod bodies and the outer walls ofthe flow injecting pipes; the flow injecting pipes are internally provided with air inlet and water inlet channels; and with the direction opposite to the rotating direction during drilling of the drill rod bodies as the reverse direction, the outer cylindrical surfaces of the rod bodies are provided with spiral grooves rising in the reverse direction and in cylindrical spiral shapes, and a plurality of pressure relief holes communicating with inner cavities in the rod bodies are formed in the spiral grooves. During drilling of a soft coal seam and an outburst coal seam, the drill rod has theadvantages that the hole protecting ability is high, the slag discharging channels are not prone to being plugged, the hole forming effect is good, the slag discharging and temperature reducing abilities are high, and the hole collapse area is automatically dredged.

The invention belongs to the field of building construction, is suitable for the technical field of rotary spraying anchor cable construction and provides a rotary spraying anchor rope drill body and a construction process of a rotary spraying anchor rope. The rotary spraying anchor rope drill body comprises a double-pipe rotary spraying drill rod, a diameter-variable linkage clamping groove drill rod, an anchor head and a bottom sealing steel ball, the front end of the double-pipe rotary spraying drill rod is connected with the front end of the diameter-variable linkage clamping groove drill rod, the rear end of the diameter-variable linkage clamping groove drill rod is connected with the anchor head, and the bottom sealing steel ball is positioned at a joint of the double-pipe rotary spraying drill rod and the diameter-variable linkage clamping groove drill rod. The construction process includes 1), making a steel stranded wire; 2), machining an anchoring body; 3), drilling to form a hole; 4), feeding the steel stranded wire; 5), inputting the bottom sealing steel ball; 6), expanding the hole through rotary spraying; 7), tensioning and locking the anchor rope. The rotary spraying anchor rope drill body is convenient to use and high in construction efficiency; by the construction process, drilling speed can be increased effectively, process steps can be simplified, disturbance to the surrounding can be reduced, and nearby buildings and structures can be protected effectively.

The invention discloses an internal slag discharging drill rod provided with spiral convex ribs for cutting and holes for pressure relief. The internal slag discharging drill rod comprises a hollow rod body, a flow injecting pipe coaxially arranged in the rod body, and a supporting piece for connecting the rod body with the flow injecting pipe. A slag discharging channel is formed between the inner wall of the rod body and the outer wall of the flow injecting pipe; an air inlet and water inlet channel is formed in the flow injecting pipe; with the direction opposite to the rotating direction of the drill rod body during drilling as the reverse direction, the spiral convex ribs ascending in a cylindrical spiral shape in the reverse direction are arranged on the outer cylindrical face of therod body; and the multiple pressure relief holes are formed in the outer cylindrical face of the rod body along one sides of the spiral convex ribs. If hole collapse occurs during drilling, coal slagcan enter the slag discharging channel through the pressure relief holes, the acting force of the coal slag on the drill rod is released, meanwhile, the spiral convex ribs have the hole raking capability, and thus the coal slag is in a loose state and enters the slag discharging channel through the pressure relief holes till the hole collapse area is smooth.

The invention discloses a high-pressure jet grouting enlarged footing anchor rod and a construction method thereof. The anchor rod comprises an anchor rod body and a partial enlarged footing and / or a bottom enlarged footing which are arranged on the anchor rod body. The construction method comprises the following steps: firstly, cutting a soil body or a sand layer to form an anchor rod hole through the propulsion by a drilling rod and the rotary grouting by a high-pressure auto-rotating spray head; secondly, propelling slowly or stagnating for certain time at the middle part and / or the bottomof the anchor rod hole so as to form a partially enlarged aperture and / or a bottom enlarged aperture correspondingly; thirdly, pulling out the drilling rod and the high-pressure auto-rotating spray head, and putting an anchor rod reinforcing steel bar or an anchor cable in the formed anchor rod hole; and fourthly, performing secondary grouting at the orifice of the anchor rod hole to form the high-pressure jet grouting enlarged footing anchor rod. The construction method has the advantages of simple steps, low construction cost and good construction effect, and the formed high-pressure jet grouting enlarged footing anchor rod has the advantages of reasonable structure, large drawing force and low manufacturing cost.

The invention relates to a preparation method of a composite hollow fiber membrane. The preparation method is characterized by comprising the following steps: preparing a membrane casting solution; preparing a core solution and an outer gel bath; utilizing a dry-wet spinning device to inject the core solution and the membrane casting solution into a spinneret together for hollow fiber spinning, and extruding from the spinneret together to prepare a hollow fiber membrane wire; and enabling the hollow fiber membrane wire obtained in the step to pass a dry spinning path of 0-35cm and sequentially enter a first gel bath and a second gel bath for gel phase inversion to form the high polymer hollow fiber porous membrane with a microprous pore canal. The composite hollow fiber membrane prepared by the method disclosed by the invention is a hydrophilic hollow membrane material and has higher membrane flux and good pollution resistance at low pressure; simultaneously, the hollow fiber membrane has better mechanical strength due to the complementary property of the raw materials.

The invention relates to a submersible drilling machine which comprises a power source, a mast, a drill pipe, a submersible power head and a drill bit and is characterized by further comprising a sealing rotation connector, a mud transition connector and a winch synchronizing mechanism. The drill pipe is telescopic and is hollow, the submersible power head is connected with an innermost layer rod body of the drill pipe, and the drill bit is connected with a spindle of the submersible power head. Mud is fed from the mud transition connector, and passes through the hollow drill pipe to be sprayed out from the submersible power head or the drill bit. The winch is in linkage with the winch synchronizing mechanism through the submersible power head. The submersible drilling machine is applicable to the drilling process of mud circulation slagging or air circulation slagging. An output shaft of the submersible power head is connected with the drill bit and is fed with the drill bit to operate, the multilayer drill pipe capable of stretching automatically and an electric / hydraulic pipeline on the winch move vertically with the submersible power head, an air or mud delivery channel is arranged in the drill pipe and has certain sealing and pressure keeping effects. The drill pipe has a guide and torsion resisting effect on the drill bit.