33results about How to "Achieve self-stabilization" patented technology

The invention discloses a self-stabilizing operating platform for an elevator shaft, which comprises an upper layer platform, a longitudinal support frame, a diagonal bracing support and a lower layer platform, wherein the upper layer platform is in a square shape, and the area is slightly smaller than the cross sectional area of the elevator shaft; the area of the lower layer platform is smallerthan that of the upper layer platform; one side, which is close to an elevator door, of the lower layer platform and the corresponding side of the upper layer platform are positioned in the same vertical plane; upper and lower ends of the diagonal bracing support are respectively fixed to one side, which is away from the elevator door, of the upper and lower layer platforms; rectangular support legs for being clamped at the external corner of a wallboard at an elevator opening are arranged on one side, which is close to an elevator door, of the lower layer platform; hanging rings are respectively arranged at four corners of the upper layer platform, the height of the two hanging rings close to one side of the elevator door is greater than that of the two hanging rings away from one side of the elevator door; and when the platform is hoisted, and the top of each hanging ring is positioned at the same height, the rectangular support legs are positioned in the elevator shaft. The operating platform is simple in machining, and can realize self-stabilization and can be used repeatedly, and the safety of the platform is increased by fixed bolts of the upper layer platform.

The present invention provides an expandable tent based on a tensegrity structure, which includes two kinds of connectors, connecting rods and rope members; There is a connection hole for connecting with the end of the connecting rod and the telescopic rod; one end of the second connector is provided with a connecting hole to connect with the connecting rod and the telescopic rod member, and the other end adopts a 'cross'-shaped structure for connecting with the rope member . Utilizing the self-balancing characteristics of the tensegrity structure, the technical problem of unstable tent structure in the prior art is solved. The structure of the tent frame is simple, the number of components is small, and the structure is easy to build; and due to the self-balancing characteristics of the tensegrity structure, the joints of the components do not need additional bolts and screws for fixing, and the entire structure can be supported by the connection between the cables and rods. stand up. And after the tent structure is built, the folding and unfolding of the entire tent structure can be realized by changing the length of the telescopic rod.

The invention provides a vertical take-off and landing fixed-wing cargo unmanned aerial vehicle, which includes a fuselage, a mechanical arm is mounted under the middle beam of the fuselage, a cargo warehouse is arranged above, and winglets and landing gear are symmetrically installed on both sides. The first landing gear is A-shaped, the braces of the two landing gears are fixed to the middle beam through connecting rods, the first power system parallel to the fuselage is fixedly connected to the middle beam through the first carbon rod, and the second power system perpendicular to the fuselage The system is fixedly connected to the upper beam of the fuselage through the second carbon rod. An equipment compartment is arranged above the upper beam. The flight control, receiver, GPS and battery are loaded in the equipment cabin. The flight control signal is connected to the receiver and GPS, and the battery Power the flight controller, receiver and GPS. The vertical take-off and landing fixed-wing cargo unmanned aerial vehicle described in the present invention combines the advantages of the rotary-wing unmanned aerial vehicle and the fixed-wing unmanned aerial vehicle. Greatly increased cruising range.

The invention belongs to the technical field of design of shield tunneling machine cutters, in particular to a tapered cutter of a shield tunneling machine. The cutter, spokes and a shell-shaped tool rest form a tapered structure, and a cone-apex half angle alpha is less than or equal to arctanf, wherein alpha is the cone-apex half angle, and f is the static friction coefficient between the cutter of the shield tunneling machine and a boulder. The spokes are distributed uniformly, the number N of the spokes is an integer, A is the width of the spokes, B is less than min (L, W, H), and L, W, H are determined by geological exploration information, where L is the maximal size of the boulder above in the length direction, W is the maximal size of the boulder above in the width direction and H is the maximal size of the boulder above in the height direction. According to the scheme, the rigidity of the cutter is improved, the interaction between a tool and the boulder is lowered, and the working performance of a shield is effectively improved; furthermore, the energy consumption during boosting can be effectively reduced under the condition of the same tunneling quantity; and the working efficiency can be improved and the energy consumption can be reduced by about 5 percent respectively by preliminary estimation, so that the utilization rate of the shield tunneling machine is effectively improved.

The invention discloses a construction method for underground excavation of a subway station, which is characterized in that it comprises the following steps: S1: using the pipe shed method to construct above the soil in the area to be excavated to form the upper pipe shed support; S2: The two sides and the bottom of the soil body in the area to be excavated are carried out for the first time in all-round high-pressure spraying method construction to carry out piling and hole layout; S3: divide the area to be excavated into a plurality of excavation intervals, and use the pipe shed method and freezing The method carries out construction to the soil between the adjacent described excavation intervals, and the soil on both sides and bottom of the area to be excavated into pipe shed pipes and frozen pipes to form frozen walls; S4: for each Excavation and support are carried out in the excavation section; this construction method can solve the problem that the prior art underground excavation method cannot be applied when the covering soil is relatively shallow and the structural section is large when constructing the subway station.