6results about How to "Reduced forward resistance" patented technology

The invention discloses a hydraulic system of a non-circular heading machine blind area cutting device and a control method. The problems that in the prior art, a non-circular heading machine is low in blind area processing efficiency in construction and the like are solved. The hydraulic system comprises roller cutting tools arranged in excavation blind areas of two adjacent circular cutter heads, and the roller cutting tools are driven by a closed hydraulic control system; the closed hydraulic control system comprises a pump set, a port A and a port B of the pump set are respectively connected with a bidirectional constant displacement motor set, and an oil return control valve set is arranged between the port A and the port B of the bidirectional constant displacement motor set; the pump set comprises a two-way variable pump and an oil supplementing pump. A first part of replenished oil of the oil replenishment pump adjusts the output direction and the displacement of the two-way variable pump through a displacement adjusting device; and the second part of supplementary oil of the oil supplementing pump is used for supplementing oil to the pump set through the oil supplementing valve set. The hydraulic control system structure of the blind area processing device is small in soil disturbance, small in section overexcavation amount and high in construction efficiency, the advancing resistance of the heading machine can be reduced, and the accuracy of heading attitude control of the heading machine is guaranteed.

The application relates to a directional drilling structure for a navigable river and an application method thereof, and relates to the drilling technology field; the directional drilling structure for the navigable river comprises a drill bit body, an agitating frame is rotationally connected to the end of the drill bit body, a control element is arranged on the drill bit body, and the control element is used for driving the agitating frame to rotate; the application has the effect of reducing the possibility of yaw in the drilling process of the drilling equipment.

The invention relates to the technical field of fruit tree planting, and provides a bionic fruit tree root lifting device, system and method.The bionic fruit tree root lifting device comprises a shovel body, a connecting rod, a bionic shovel blade and a guiding part, the first end of the connecting rod is connected with the shovel body, and the second end of the connecting rod is used for being connected to a suspension frame on the rear portion of a tractor; due to the fact that the front feet of the cicada nymphs are similar to a shovel in structure and are good in digging hard soil, the bionic shovel blade is designed to be a cicada nymph imitating multi-tooth shovel blade, and the bionic shovel blade is arranged at one end of the shovel body, is arranged to be in a sawtooth shape and is used for being inserted into the soil to conduct root pulling operation. The guiding part is arranged at the other end of the shovel body, and the guiding part can outwards convey the dug tree roots to the ground in the length direction of the guiding part; the tree root digging device is simple and reliable in structure and convenient to use, tree roots of fruit trees can be dug up in a time-saving and labor-saving mode, the rows of tree roots left after cutting of old orchards can be subjected to root digging operation, and the tree root digging operation efficiency is improved.

The utility model relates to a cutter and weeding machine wherein the cutter comprises a rotating shaft, a cutter and a cutter mounting structure for mounting the cutter on the rotating shaft, the cutter mounting structure comprises an upper connecting block fixedly connected to the lower end of the rotating shaft and a lower connecting block fixedly connected to the cutter, the upper side of the lower connecting block abuts against the lower side of the upper connecting block, the lower connecting block is detachably connected with a fastener, and the fastener is detachably connected to the upper connecting block. The multi-stage adjustable weeding device can realize multi-stage adjustment of the direction of the cutter, is convenient to disassemble and assemble, and can realize a better weeding effect.

The application discloses a gas well wellbore liquid fall-preventing throttling tool, which comprises a fishing head, a liquid fall-preventing throttling body, a sleeve, a liquid inlet cylinder, a connecting cylinder, a setting spring, a clamping sleeve, a sealing ring, a throttling channel, a liquid fall-preventing spiral flow channel, a setting clamp and a setting chamber. The device divides the inflowing gas-liquid fluid into two parts by the liquid fall-preventing throttling body, throttles, accelerates and depressurizes most of the fluid in the throttling channel, effectively prevents the liquid from falling back, and makes the other part of the fluid spiral upward along the liquid fall-preventing spiral flow channel. The asymmetric "narrowing-expanding" structure of the flow channel makes the forward resistance of the liquid smaller than the backward resistance, so that the liquid is less likely to fall back. The device is suitable for the water-gas well with insufficient gas liquid-carrying capacity, liquid fall or liquid accumulation in the wellbore, and can realize throttling, acceleration, pressure reduction, liquid fall prevention and improvement of the gas liquid-carrying capacity.

The utility model discloses an efficient vibration well cementation tool, and particularly relates to the technical field of casing pipe well cementation engineering under oil and gas wells, the efficient vibration well cementation tool comprises a guide head, a shell, a supporting ring and a center rod, the supporting ring and the center rod are arranged in the shell, the supporting ring is fixed on the middle upper portion in the shell, and a liquid inlet hole is formed in the supporting ring. A plurality of sets of impellers distributed in the circumferential direction of the supporting ring at equal intervals are arranged below the liquid inlet hole, the impellers are connected with a transmission gear through a transmission shaft, the center rod is connected with a reversing gear matched with the transmission gear, the center rod is fixedly connected with the guide head, and the center rod is connected with a balance weight eccentric block so that the center rod can drive the guide head to generate vibration. The impeller rotates to provide a rotating power source for the center rod, and the counterweight eccentric block is matched with the center rod to rotate to drive the guide head to vibrate, so that clogging or coal briquettes and the like in a well are crushed or guided through high-frequency vibration, the clogging problem is solved, and the friction resistance and buckling problems are avoided; and stable and rapid running of the casing pipe is realized.