1029results about How to "Strong pull" patented technology

A constraining sheath for use around an endoprosthesis (e.g., a stent device, with or without a graft covering), which may be a balloon expandable endoprosthesis but more preferably is a self-expanding prosthesis. The endoprosthesis is coaxially enclosed within and substantially covered by the constraining sheath, which is an outer, removable tubular sheath, preferably made of ePTFE. The sheath is preferably corrugated circumferentially along at least a portion of the length of the endoprosthesis. The constraining sheath and endoprosthesis are preferably mounted together as an assembly at the distal end of a delivery means such as a catheter shaft, for delivery of the endoprosthesis to a desired location within a body conduit such as an artery. The constraining sheath is removed by the application of tension to a tensile member such as a tether to cause sequential pulling out of the corrugations followed by release and deployment of the endoprosthesis. The use of a corrugated constraining sheath in comparison to a non-corrugated sheath results in a more smoothly applied tensile force to effect the endoprosthesis release as well as requiring less maximum force.

An instrument for placing U-shaped surgical clips comprising a magazine that has a distal and a proximal end in which several clips are arranged one behind the other in a guide that can be pushed in longitudinal direction. On the lower side of the magazine, a feeding plate which by means of flexible lugs is in contact with the back sides of the clips and can be pushed forwards and backwards by means of a pushing device over at least a distance between one clip and the next clip parallel to the guide of the magazine is provided. The movement of pushing forward shifts all the clips in the direction of the distal end of the magazine. When the feeding plate is pushed forwards, the pushing device contacts said feeding plate at a point which is at a distance of at least half a length of the feeding plate away from the proximal end of the feeding plate.

A support arm assembly for assisting in the performance of cardiac surgery has an articulated arm movable axially of a support base and rotatable relative to the support base. A distal end of the articulated arm receives a contact member and the contact member is moveable relative to the distal end. A surgeon may configure the support arm assembly to contact a desired portion of a heart and fix the articulated arm, its axial position, its rotated position and the orientation of the contact member with a single control.

The invention relates to the technical field of unmanned aerial vehicles, and discloses a tandem double-duct type flight robot and a dynamics cooperative control method thereof. The invention provides a whole dynamics modeling and cooperative control strategy of an aerial vehicle and a mechanical arm based on the tandem double-duct type flight robot and the dynamics cooperative control method thereof. In a controlling process, an acting force of the mechanical arm is not considered as disturbance on the aerial vehicle, and the mechanical arm and the aerial vehicle are not controlled respectively; a whole flight robot platform is considered as a complete dynamic system; the aerial vehicle participates in adjustment of postures of a tail end of the mechanical arm through position control; the changes of a gravity center and a joint torque of the mechanical arm are caused by motions, and a corresponding moment is generated to assist the control on the postures of the aerial vehicle. The flight robot can realize automatic hovering and environment interaction, and has the advantages of small spatial size, large effective load, high passibility and accessibility, high control response sensitivity, great improvement of system stability and robustness, and the like.

The invention discloses an environment-friendly mid-voltage fire resistant cable, which comprises an aluminum alloy conductor arranged in the middle of the cable, wherein a conductor shielding layer, a cross-linked polyethylene insulation layer and an insulation shielding layer are sequentially extruded on the aluminum alloy conductor in a three-layer co-extruding manner; a metal shielding layer is arranged outside the insulation shielding layer; an insulation wire core consists of the aluminum alloy conductor, the conductor shielding layer, an insulation layer, the insulation shielding layer and the metal shielding layer; the metal shielding layer, a composite fire resistant heat insulation layer, a metal belt interlocked armored fireproof layer and an outer sheath layer are sequentially arranged outside the insulation shielding layer; three insulation wire cores and a filling material are stranded to form a cable core; and the composite fire resistant heat insulation layer consists of an inorganic heat insulation layer wrapped outside the cable core, a low-smoke halogen-free antiflaming polyolefin inner protection layer extruded outside the heat insulation layer and an inorganic fiber layer wrapped outside the inner protection layer. The environment-friendly mid-voltage fire resistant cable is a fire resistant aluminum alloy conductor mid-voltage cable which is low in cost, has high bendability, high fire resistance and high antiflaming performance, and is energy-saving and environment-friendly during manufacturing.

The invention discloses a high-power umbrella-type wind power generation system, which comprises a track rope, a lift force guiding body, an umbrella stair and a generating set, wherein one end of the track rope passes through the umbrella stair to tie the lift force guiding body, and the other end thereof is fastened to a heavy; the lift force guiding body straightens the track rope to form an umbrella track; the lift force guiding body and an umbrella keep distance; the umbrella stair is formed by one or more than one umbrellas; the adjacent umbrellas keep distance; the center of each umbrella is provided with a hole for the track rope to pass through; when the umbrella is expanded, a large upward tensile force can be formed due to the function of a wind force. The umbrella is divided into a bearing umbrella and an acting umbrella according to functions, wherein the bearing umbrella is fastened to the track rope for balancing the system; the acting umbrella makes movement up and down for acting; the acting umbrella is connected with an acting rope; one end of the acting rope is fastened and connected with the acting umbrella, and the other end thereof is connected with the generating set, and thus, the generating set is pulled to make mechanical movement, and thereby, the wind energy is converted into electric energy.

The invention relates to a centering adjustment method for wheel sets of a locomotive test stand and a traction force meter stand thereof. In order to enable all locomotive wheels of a locomotive to completely fall into corresponding rail wheels in foundation pits of the test stand, during test, the centers of the locomotive wheels are required to be kept perpendicularly centered with the centers of the rail wheels, and the locomotive is required to run in location mode in the horizontal direction, and thus the tested locomotive can be ensured to run stably and safely on the test stand. The centering adjustment method of the test stand of the locomotive comprises the following steps of 1 selecting the central lines of the foundation pits of the rail wheels to serve as location reference lines; 2 adopting a double-traction force meter stand to serve as the test stand; 3 performing secondary centering adjustment on the locomotive wheel sets and the rail wheel sets; and 4 providing the same pre-tightening force for a car coupler of the tested locomotive, and offsetting or reducing the horizontal displacement of the locomotive caused by deformation of the car coupler buffer. A speed reducer shaft of the traction force meter stand is parallel with a crew, a nut is screwed on the screw, a chain wheel on the speed reducer shaft is connected with a chain wheel on the nut through a chain, and one end of the screw is connected with a traction force measurement device.

A guidewire for a catheter, comprising: an anchor for providing an anchoring force that inhibits longitudinal movement of the guidewire when the guidewire is deployed within a body cavity, duct or vessel. The anchor can provide a gripping force by pressing outwards against the tissue and in such a way that a closed path contact line between the anchor and tissue is defined. A system for cardiovascular intervention using a guidewire with anchor. A deployment system for a guidewire with anchor.

The invention discloses a wire drawing machine. Along a wood board transmission direction, the upper end face of a frame is orderly provided with a front steel wire roller which performs rough grinding on wood boards, a disk brush group which performs wire drawing on the wood boards and a rear steel wire roller which polishes the wood boards, wherein the disk brush group consists of a plurality of disk brushes which are distributed abreast; each disk brush is driven to rotate by a respective transmission motor of each disk brush and comprises a disk and steel wires densely distributed on the lower end face of the disk; the disks are all parallel to the upper end face of the frame and are all arranged on a disk brush mounting platform; a disk brush driving motor is fixedly arranged on the disk brush mounting platform; an output shaft of the disk brush driving motor runs through the disk brush mounting platform to be fixedly connected with the disks; and the disk brush group drives the steel wires to rotate through the disks. Compared with the conventional wire drawing machine, in the wire drawing machine of the invention, grooves and lines are widened, which not only increases the contact areas of the steel wires and the surfaces of the wood boards, but also increases a drawing force when the steel wires are contacted with the wood boards, thus the widening of the lines is benefited and the aim of achieving optimal wire drawing effect is achieved.

The invention discloses a PVC wrapping film which comprises the following raw materials in parts by weight: 80-120 parts of PVC resin, 10-20 parts of a plasticizer, 4-6 parts of butadiene-acrylonitrile rubber P83 powder, 1.5-2.5 parts of oleamide, 4-6 parts of a tribasic and dibasic heat stabilizer, 2-3 parts of CPE, 1-1.5 parts of ACR and 0.5-1.5 parts of stearic acid. The PVC wrapping film has the beneficial effects that (1) the film has high flexibility, damage difficulty, high bursting force resistance, impact resistance, tear resistance and high tension and can replace case packing; (2) a shrinkage ratio is large, articles can be tightly coated after thermal shrinkage, and if the film is made into a through bag of which two ends are open to be subjected to thermal shrinkage, the articles can be lifted at the two opening ends, the weight of 15KG can be borne, and the articles are convenient to carry; (3) the transparency is excellent, the light transmittance is 80 percent, products can be displayed and can be promoted invisibly, and a delivery error during the cargo movement link is reduced; (4) the film is moisture-proof, waterproof and dustproof, a packaging effect can be achieved, attractive appearance of the products can be realized, and the products are protected; (5) the PVC wrapping film is non-toxic, tasteless and pollution-free and belongs to an environment-friendly packaging material.

A band conveyor device used for the suspended transport of plate-like workpieces, metal sheets or the like and has a conveyor belt which is moved along a holding track. A vacuum device holds the goods to be conveyed by suction against a transport side of the conveyor belt. The vacuum device has a multiplicity of suction nozzles which are disposed on the holding track at the transport side of the conveyor belt, so that their nozzle edges which point towards the transported goods to be conveyed are situated at a short distance from the goods. The air necessary for holding the goods is drawn through local, separate invariable vacuum zones, through which the goods pass in succession along the transport path.

A gripping tool having a mandrel reciprocatable within a slide member, the mandrel having a top connector for connecting to a tubular string and a bottom connector for connecting to a cutting tool, the slide member having at least one radially outwardly biased friction member and a slip cage with at least one window through which a slip is deployable, by movement of the mandrel within the slide member, to engage and grip a section of casing to be removed from a well, the mandrel being rotatable by rotation of the tubular string to operate the cutting tool with the gripping tool in the gripping mode. After detachment of the section of casing by the cutting tool, the gripping tool and the gripped section of casing are pulled from the well. The gripping mode is restorable to a running position to reset the tool in the casing.

The invention provides a crane, a method for controlling the tension of a steel wire rope and a hydraulic system, and the crane, the method and the system can be used for solving the problems of low stability and low work efficiency of the conventional stretchable arm type crane with a super-lifting winding mechanism during stretching of a lifting arm in the prior art. The hydraulic system comprises a master reversing valve, a switching valve, a check valve, a backpressure valve and a hydraulic motor, wherein the master reversing valve is used for leading hydraulic oil into or out of the hydraulic system; the hydraulic motor is used for outputting power to a traction device of the steel wire rope; a first end of the switching valve is communicated with a first oil outlet of the master reversing valve; the inlet of the check valve is communicated with the outlet of the backpressure valve; a second end of the switching valve is communicated with the second oil outlet of the master reversing valve and a first end of the hydraulic motor; and the inlet of the backpressure valve is communicated with the outlet of the check valve and a second end of the hydraulic motor.