56results about How to "Reduce propulsion resistance" patented technology

A navigation guide wire (1 ) through an anatomical apparatus, for example a vascular system, unusually capable of being safely positioned proximate to bifurcations, comprises: - an elongated body (19) having a proximal end (21 ), a distal end (20), and a longitudinal extension along an axis (x-x) extending at least from said proximal end to said distal end; - at least one first proximal portion (4) having a predetermined first flexural rigidity (KfI ) capable of a first predetermined flexure in at least one plane comprising at least one portion of said longitudinal axis in order to allow a first curvature to said proximal portion when bending stressed, while ensuring a predetermined elastic return in a rectilinear position of the elongated body proximal portion when not subjected to stresses; - at least one second distal portion (3) having a predetermined second flexural rigidity (Kf2), the amount of which is equal to or higher than said first flexural rigidity of said at least one first proximal portion, capable of a predetermined flexibility of said second distal portion in order to obtain a second curvature when bending stressed in at least one plane comprising at least one portion of said longitudinal axis, while ensuring an elastic return to a rectilinear position of said distal portion of said elongated body when not subjected to stress; - at least one intermediate length (6), arranged between said first proximal portion and said second distal portion, having a third flexural rigidity (Kf3) essentially lower than said first flexural rigidity (KfI ) and said second flexural rigidity (Kf2), which allows a predetermined flexibility capable of a third curvature substantially more pronounced compared to said first curvature and second curvature, so as to allow a considerable direction change between said first proximal portion (4) and said second distal portion (3).

Provided is a drill for composite material, this drill permitting a high quality boring operation wherein almost no burrs or delamination occurs during the boring of a member to be machined which at least partially contains fiber-reinforced composite material. The drill (1) for composite material comprises a tip section wherein a tip cutting edge (5) is formed; a tapered section (4) that is formed by being joined to the rear end portion of the tip section and is further formed into a tapered shape having a diameter difference equal to the difference between the rear end portion outside diameter and the tip portion outside diameter, the aforementioned rear end portion outside diameter being larger than the aforementioned tip portion outside diameter; and a straight section (3) that is formed by being joined to the rear end portion of the tapered section (4) and is further formed so as to have the same diameter throughout the straight section (3) in such a way that the member to be machined can be finished to a bored diameter which is larger than the outside diameter of the rear end portion of the tapered section (4). On the periphery of the tapered section (4), there are formed peripheral cutting edges (7) which are spirally twisted and are set in such a way that a bored diameter increases continuously.

The invention discloses a flexible reinforced type segmental epidural catheter and a manufacturing method thereof. The flexible reinforced segmental epidural catheter comprises a catheter body for guiding liquid medicine for anaesthesia, a medicine inlet and a medicine outlet of the catheter body are communicated, a supporting spring body is arranged inside a catheter body cavity; one end of the catheter body is provided with a flexible tip section, the flexibility of the flexible tip section is superior to that of a main body section of the catheter body. The manufacturing method of the flexible reinforced type segmental epidural catheter is reasonable in technology, high in operability, safe and reliable and has the advantages of being simple in technology, easy to master, low in production cost, high in efficiency, reliable in quality and the like.

The invention discloses a using method of slurry in crossing-with-directional-drilling of river construction. The method comprises the steps that the slurry is prepared according to formation conditions and diameter and length of crossing pipelines, and suitable slurry materials are selected; in a pipeline crossing process, time needed by the slurry and a drilling bit to reach different soil layers is calculated according advance speed of directional drilling, reaming, hold flushing and pipeline back-dragging in different soil layers and flow rate of the slurry, the slurry required by different soil layers is injected into a drill hole at preset times, the slurry returned from the drill hole is injected into a slurry circulation tank, and the slurry is returned to the drill hole and used after the slurry is processed. According to the method, effects of suspending, carrying, lubricating, hole fixing, leakage plugging and the like of the slurry are improved, and occurrences of phenomenons of hole collapse, formation leakage and the like are effectively avoided.

The invention discloses an inner core cutter of a hollow cylindrical sample of soft clay. It has a casing, the upper end of the casing is provided with a cutting edge, the lower end of the casing is connected with the detachable casing bottom bracket through the casing bottom bracket-casing positioning screw, and the detachable soil holding bracket is arranged above the detachable casing bottom bracket. There is a pressure relief hole on the detachable soil holder, and a main drill bit is arranged in the middle of the casing. The main drill bit is composed of a spiral drill bit and an inner edge blade, and is connected with a drill pipe. The drill pipe passes through the detachable soil holder and the bottom of the detachable casing. The brackets are respectively fixed by the soil support-drill pipe set screw and the casing bottom support-drill pipe set screw. The detachable blade is composed of an outer edge blade and a horizontal blade, and is rigidly connected to the main drill bit through the blade set screw. The casing is cylindrical. The cutter can successfully prepare the hollow cylindrical sample of undisturbed soft clay, and the disturbance and extrusion effect on the sample during the cutting process are small, which provides equipment guarantee for the experimental research of undisturbed soft clay under complex stress conditions.

The invention relates to a manufacturing process of a blade of a straight-knife cutting machine. The process comprises the following steps: Step 1, when processing the blade, the guide edge reserves a unilateral machining allowance of 0.02 to 0.04 mm; Step 2, the guide edge of the blade is roughly ground Roughly grind the leading edge of the blade with a rough grinding wheel; step 3, finely grind the leading edge of the blade; finely grind the leading edge of the blade with a fine grinding wheel; step 4, polish the leading edge of the blade once; Carry out a polishing; Step 5, the second polishing of the blade guide edge; use the wind wheel, coarse cloth wheel or wool wheel to perform secondary polishing on the blade guide edge, so as to complete the production of the entire blade. The present invention leaves a processing allowance when the blade grinds the guide edge, and increases the sharpening process of the guide edge after processing, so that the surface roughness of the guide edge becomes smaller, the friction coefficient is reduced during use, and the temperature in the frictional contact area between the blade and the cut fabric will decrease. With a large reduction, the cutting of molten materials will become easier and smoother.

The invention discloses an amplitude variation rolling friction drilling machine component. The amplitude variation rolling friction drilling machine component comprises a drilling machine unit, an amplitude variation unit and a rolling friction unit. The amplitude variation unit comprises a cross beam which is a telescopic cross beam. The cross beam comprises a telescopic beam and a fixed beam which are sleeved with each other, and tracks are arranged on the telescopic beam in the length direction in a spaced mode. The fixed beam end of the amplitude variation unit is fixedly arranged on a drilling machine. The telescopic beam end of the amplitude variation unit is provided with the rolling friction unit. The rolling friction unit and the head of the drilling machine can be adjusted to swing in the range of 0-105 degrees through the amplitude variation unit, and the rolling friction unit can drive the head of the drilling machine to walk in a rolling mode in the axial direction of the rolling friction unit. The drilling machine unit comprises a drilling machine power head, a drilling rod and a drilling bit. The drilling machine power head is installed on the rolling friction unit. The drilling rod and the drilling bit are sequentially installed on the drilling machine power head.