37results about How to "Eliminate creep" patented technology

The invention relates to a novel optical fiber temperature and pressure sensor, which comprises an elastic diaphragm, an optical fiber Bragg grating and a demodulator connected with the optical fiber Bragg grating, wherein a short connecting pipe is sleeved on a raised column of the elastic diaphragm; the other end of the short connecting pipe is fixedly provided with a hollow rod; the hollow rod and the end face of a first optical fiber in the center thereof form a first reflecting surface through polishing; a reflecting film is plated on the first reflecting surface; the other end of an outer protection tube is inserted into a long connecting pipe with a second ceramic ferrule component; the bending part of a second optical fiber is provided with the optical fiber Bragg grating; a second ceramic rod and the end face of the second optical fiber in the center thereof form a second reflecting surface through polishing; and the first reflecting surface of the hollow rod and the second reflecting surface of the second ceramic ferrule component are centered and are provided with a space therebetween to form a Fabry-Perot cavity. The optical fiber temperature and pressure sensor is used for manufacturing optical fiber sensors.

An umbilical assembly for supplying power to subsea equipment includes an electrical conductor to convey an electrical current to the subsea equipment. An insulator surrounds the conductor. A support member is positioned between the insulator and the conductor. The support member has either non-magnetic properties or low-magnetic properties because of its material composition. The support member is adapted to connect to a structure at the surface of the sea. The support member supports the weight of the conductor. The supporting of the weight of the conductor by the support member can be to reduce creep typically associated with the conductor supporting its own weight. The support member can be used to hermetically seal the conductor and prevent hydrogen migration along the conductor.

The invention discloses a spot welding fiber bragg grating strain sensor. The spot welding fiber bragg grating strain sensor comprises a fiber bragg grating strain sensor body and a base body made of high-elasticity alloy materials, wherein the base body comprises a substrate, a left regulating block and a right regulating block, the left regulating block and the right regulating block are connected with the left end and the right end of the base body respectively in an integrated mode, a base body groove is formed in the middle of the position, between the two regulating blocks, of the base body, the outer side of the fiber bragg grating strain sensor body is provided with a packaging layer made of low-melting-point glass powder, and the lower half portion of the packaging layer is connected with the base body groove; the right regulating block is transversely provided with a regulating hole, a regulating bolt penetrates through the regulating hole, and the left end of the regulating bolt abuts against the right side face of the left regulating block; the periphery of the substrate is provided with a rubber layer used for sealing. As the spot welding fiber bragg grating strain sensor is obviously superior to a traditional resistance strain gage, the purpose that the real-time state of strain of an iron tower electric transmission line is known comprehensively for a long time is achieved.

The invention relates to the field of a pipeline flange sealing structure, in particular to a high-temperature flange sealing structure comprising a flexible graphite metal omega-shaped tooth composite gasket. The high-temperature flange sealing structure is characterized by comprising an upper flange, a lower flange and the flexible graphite metal omega-shaped tooth composite gasket. The upper surface and the lower surface of a metal frame of the flexible graphite metal omega-shaped tooth composite gasket are provided with annular boss in multiple circles respectively, the annular bosses are provided with omega-shaped sections and arranged at equal distance, the planar parts of the upper and lower surfaces of the flexible graphite metal omega-shaped tooth composite gasket are provided with flexible graphite layers, annular grooves matched with the annular bosses are arranged on the contact surfaces of the upper flange, the lower flange and the flexible graphite metal omega-shaped tooth composite gasket and provided with rectangular sections, the annular bosses are inserted into the annular grooves correspondingly and are in interference fit with the same. The high-temperature flange sealing structure can be applied to high-temperature and -pressure working conditions, excellent tightness can be kept for a long time, and leak of the flanges can be effectively prevented.

In one embodiment of the invention, there is provided a roofing tape for assisting in the installation of a plurality of selected roofing material to a roof section, the selected roofing material having a width, an offset requirement, and a gap requirement; the roofing tape including a front surface; a back surface; a first edge; a second edge; a first indicia disposed on the front surface of the roofing tape, located at a pre-determined distance from the first edge designating the starting position; a second indicia indicating placement of the first course, which is disposed at a location apart from the first indicia, the location being equal to the width of the roofing material plus any required gap space; and a third indicia indicating placement of the second course, which is disposed at a location apart from the first indicia, the location being equal to the width of the roofing material plus any required gap space minus half the width of the roofing material. Methods of using the roofing tape are additionally provided herein.

The invention discloses a heat treatment and quenching process for high-carbon high-chromium tool steel. The material is high-carbon high-chromium ledeburite cold-worked tool steel with the steel number of ASSAB XW-5 imported from Sweden, and the tool steel mainly comprises, by weight percentage, 2.05% of carbon, 12.5% of chromium, 1.3% of wolfram, 0.8% of molybdenum and 0.3% of silicon. The heattreatment and quenching process comprises the following steps that (1), workpieces are put into a quenching furnace to be preheated to 150 DEG C; (2), the workpieces are put into the quenching furnacefor two-stage heating until the quenching temperature is 965 DEG C, and then heat preservation is carried out; (3), the workpieces are taken out from the quenching furnace for air-blast quenching until the temperature is 70 DEG C; and (4) the workpieces are placed into a tempering furnace, the workpieces are heated to 280 DEG C, heat preservation and tempering are carried out on the workpieces, the workpieces are taken out from the tempering furnace for air cooling, and then the above procedures in the step (4) is repeated. According to the heat treatment and quenching process, staged heatingand twice tempering are adopted, and therefore the heating is more uniform, the hardenability of the workpieces is improved, the crystal grains can be refined, uniform, stable and reliable, the service life and the mechanical property of the parts are obviously improved, the toughness and the impact resistance of the workpieces are improved, and the use requirements of the precise parts are met.

A method for sharp, crisp hemming inner and outer aluminum sheet metal panels in which a flange is formed along an outer edge so that the flange extends from a bend line and lies in a plane generally perpendicular to the plane of the outer panel. This bend line, furthermore, has an outer radius in the range of (1.0 mm+t)>R>(0.2 mm+t) where t=the thickness of the outer panel. The inner panel is then positioned on the outer panel so that an outer edge of the inner panel is adjacent the bend line. The flange is then bent so that the flange overlies the outer edge of the inner panel while simultaneously compressing the flange in the direction towards the bend line. Thereafter, the flange is compressed against the outer peripheral portion of the inner panel thus completing the hem. The present invention thus achieves a sharp radius bend on the outer edge of the panel with a layer radius bend on the inner panel as well as a class "A" surface on the outer panel adjacent the hem which is free of recoil or other distortion.

The invention relates to a mooring tensioning arrangement for a floating structure or a vessel (11), comprising -a mooring line (3, 5, 7) having a first mooring part (3) and a second mooring part (5, 7), divided by a midwater coupling (4, 40, 400, 111), said at least a portion of the mooring line (3, 5, 7) is made of synthetic material, -said mooring line (3, 5, 7) is extending between an anchor (2) arranged on the seabed and a pulling unit (9, 10, 42) arranged separate from the floating structure or vessel (11), said mooring line (3, 5, 7) is extending at least via a fairlead pulley or a chain wheel (8, 80) arranged on the floating structure (11) between the anchor and the pulling unit (9, 10, 42) when the mooring line (3, 5, 7) being pre-tensioned, -a chain stopper (6, 60) being arranged in connection with the mooring line (3, 5, 7) between the anchor (2) and the floating vessel or structure (11) for tensioning the part of the mooring line (3, 5, 7) situated between the floating structure (11) and the anchor (2) at a pretension level. The mooring tensioning arrangement further comprising a second tensioning line (100) configured to be attached in one end to the midwater coupling (4, 40, 400) and in the other end coupled to the pulling unit (9,10, 42) when said mooring line (3, 5, 7) being re-tensioned, said midwater coupling (4, 40, 400) and the pulling unit (9, 10, 42) being arranged relative each other such that the tensioning line (100) is configured to impose a lateral force on the part of the mooring line (3, 5, 7) arranged between the anchor (2) and the floating structure (11) for removing stretch in the mooring line (3, 5, 7). The invention also relates to a method tor tensioning the mooring tensioning arrangement.

The invention provides a steel core prestress processing system and prestress processing method of a steel-cored aluminium strand. A wire feeding tension device, a heating device and a wire outgoing tension device are sequentially arranged between a guide wire pay-off rack and a guide wire take-off rack, wherein the wire feeding tension device comprises a wire feeding tension wheel and a wire feeding driving part for driving the wire feeding tension wheel to be rotated; the wire outgoing tension device comprises a wire outgoing tension wheel and a wire outgoing driving part for driving the wire outgoing tension wheel to be rotated; rotation speed of the wire feeding tension wheel is smaller than that of the wire outgoing tension wheel; and a steel core which is coated with the steel-coredaluminium strand and is paid off from the guide wire pay-off rack is arranged on the wire feeding tension wheel in a winding manner, penetrates through the heating device, and is arranged on the wireoutgoing tension wheel in a winding manner. According to the steel core prestress processing system and prestress processing method of the steel-cored aluminium strand disclosed by the invention, theproblem that a conventional steel-cored aluminium strand is adopted, and the stress property of the steel-cored aluminium strand is changed due to produced deformation and creepage under a temperatureand stress effect so as to affect operation safety of the steel-cored aluminium strand is solved.

The invention discloses an automatic calibration circuit for a fiber grating demodulator F-P filter. A CPU controls the output voltage of a first DA converter to reach a starting voltage; the output voltage of a second DA converter serves as a reference voltage of a third DA converter; adjustable range of the output voltage of the third DA converter is realized by adjusting the output voltage of the second DA converter; and a voltage adder enables the starting voltage and a scanning voltage to be superposed, and then, through phase inversion of a voltage phase inverter, the voltage drives the F-P filter. The invention further discloses an automatic calibration method for the fiber grating demodulator F-P filter. The method is characterized by, in the operation process, calculating a center voltage V3 of the first peak and a center voltage V4 of the last peak of an etalon after each scanning measurement; and controlling the range V1-V2 of the output voltage Vo of the voltage adder to be from V3-1.5 V to V4+1.5 V. The method can determine the voltage scanning range of the F-P filter automatically, thereby saving time and labor.

The invention discloses a structure for preventing a rear axle stabilizer rod from loosening and having abnormal sound. The structure comprises a rear axle stabilizer rod, wherein stabilizer rod sleeve barrels are respectively and fixedly connected to two ends of the rear axle stabilizer rod; each stabilizer rod sleeve barrel is provided with a barrel top surface and a barrel bottom surface; eachbarrel top surface comprises a first annular plane and a second annular plane; the height between each second annular plane and the corresponding barrel bottom surface is greater than that between thecorresponding first annular plane and the corresponding barrel bottom surface; loosening preventing teeth are arranged on each first annular plane, and each loosening preventing tooth is provided with a tooth top and a tooth root; and the height between each tooth top and the corresponding tooth root is greater than that between each first annular plane and the corresponding second annular plane.The structure disclosed by the invention is simple in structure, low in cost, and high in reliability; the problems that the torque of a relevant part is loosened, and a chassis at the relevant parthas abnormal sound can be solved; and the driving quality and the appearance quality can be improved.

The invention discloses a loosening preventing and shaft breaking preventing structure of a suspension bush. The structure comprises the suspension bush, wherein the suspension bush is used for beingconnected with a subframe or a vehicle body and comprises an inner sleeve which is provided with a contact surface, the contact surface is in contact with the subframe or the vehicle body, a pluralityof anti-loosening teeth are arranged in the circumferential direction of the contact surface, and grooves are formed in peripheries of the anti-loosening teeth. The suspension bush is tightly connected with the subframe or the vehicle body, so that the problems of looseness and shaft breakage of the suspension bush commonly existing in the prior art can be effectively solved, the operation stability of a chassis is prevented from being reduced, the driving quality is improved, looseness of a vehicle after a certain service life is avoided, and potential after-sale complaints and recall risksare eliminated.

The invention discloses a film type resistance strain gauge used in a high-pressure hydrogen sulfide environment. The film type resistance strain gauge comprises a substrate, a transition buffer layerarranged on the upper surface of the substrate, an insulating layer arranged on the upper surface of the transition buffer layer, a functional layer arranged on the upper surface of the insulating layer, and a protective layer arranged on the upper surface of the functional layer, wherein the substrate is made of a 316L stainless steel material, the transition buffer layer is a Cr film, the insulating layer is an AlN film, the functional layer is a FeNi alloy film, and the protective layer is a CrOx film. In a high-pressure hydrogen sulfide environment, the film type resistance strain gauge can be firmly fixed on a test sample, and the connection between the film type resistance strain gauge and the test sample is inorganic so that zero drift and creep deformation are eliminated, temperature self-compensation is realized, and the sensitivity of the film type resistance strain gauge and the accuracy of a measurement result are improved.