142results about How to "Stable length" patented technology

A vacuum cleaner comprising: a motor coupled to a fan for generating air flow; a dirt separation means located in a path of the air flow generated by the fan; a cleaner head located in the path of the air flow upstream of the dirt separation means; at least one support wheel for supporting the vacuum cleaner upon a floor; and an elongate body with a handle at a longitudinal end, wherein the motor, the fan, the cleaner head, the dirt separation means and the at least one support wheel are arranged about an opposite longitudinal end of the elongate body to the handle, wherein the elongate body is telescopically extendible to alter the length of the vacuum cleaner between a compact position and an extended position and wherein the extended position is at least double the length of the compact position.

The invention discloses a TCP congestion control method for centralized end network coordination in a data center network. The method comprises the steps that a queue length of each port is obtained,and when the ports are in a congested state, according to queue length thresholds of different congestion levels, the congestion levels of the ports are marked; a source IP, source TCP port, and Packet byte size of each data packet newly queued in the ports in the congested state are extracted, the extracted information and the congestion levels of the ports are adopted to generate congestion messages; a controller receives the congestion messages uploaded by an exchanger, scheduling flows and deceleration factors of the ports which need to be decelerated are selected according to the congestion levels of the ports corresponding to the congestion messages; the scheduling flow and deceleration factor of each congested port is adopted to generate an adjustment message, and the adjustment messages are sent to a host side corresponding to the scheduling flows by means of TCP Socket communication; and the host side adjusts the transmission rates of the scheduling flows according to the scheduling flows and deceleration factors in the adjustment messages.

It relates to the glue sleeve seal teeth shape reversed V shape forming sulfuration. It makes belt blank at the inner mold, installs the round cylinder glue sleeve with teeth on the surface inside and smooth surface inside both ends on the glue sleeve base and fastened with shrouding rings, putting them into sulfur can, hanging belt blank into glue sleeve, covering the top cap and the cap of the sulfur can, sequentially opening the outside pressure and inner pressure steam for sulfuration, stripping the belt blank round cylinder with vertical rack outside and the cutting belt blank round cylinder, getting many teeth shape cutting V belt. It solves the sealing issue at both ends of the glue sleeve, eliminating the bubbling stratification defect of the product, increasing effective cutting 2-4 lines, reducing material consumption and cost.

A multilevel container is disclosed which comprises circumferentially continuous wall or bottom elements of sheet metal with radially outwardly beaded end faces. The wall and bottom elements are placed on top of each other on butt joints so as to seal the end faces and are detachably braced with a minimum of one neighboring container level. The multilevel container also comprises one or more sealing rings and bracing components that act on neighboring end faces. In order to provide a readily manufacturable and form a stable multilevel container without multiple beads in alternating directions or weldings in the butt joint portions, a separate and independent shape retaining ring is provided. This ring reinforces the container and has shape retaining surfaces on its two end faces. In the region of their end faces, the neighboring wall and bottom elements are set on and tightly braced against the shape retaining surfaces of the reinforcing shape retaining ring. Radially inside or radially outside the reinforcing shape retaining ring, a separate sealing ring is inserted between the radially outwardly beaded sheet metal end faces of the neighboring bottom or wall elements of the multilevel container or between these end faces and the reinforcing shape retaining ring.

A stick that is excellent in shock absorption and is also excellent in stability is provided.

A stick body is provided with a telescopic extension pipe formed by fitting an outer tube and an inner tube together in a nesting manner. Inside the extension pipe, a velocity-dependent damper that damps the relative sliding movement between the outer tube and the inner tube, and a compression coil spring that concentrically fits onto the damper and urges the extension pipe so as to be extended are connected in parallel. According to such a stick, the shock transmitted to the hand can be mitigated as the compression coil spring contracts upon landing. Also, since the damper suppresses unwanted vibration of the extension pipe, the length of the stick quickly becomes stable after landing, allowing the user to keep stable balance with the stick.

The invention is an improved high pressure hose used for hydraulic actuation and fluid conveyance of various liquid media under relatively high pressure. The hose has an inner tube of an elastomeric material that provides a fluid-carrying passageway. The inner tube is covered with a layer of braided yarn and a layer of textile yarn extending parallel to the axis of the fluid-carrying passageway, with an outer sheath of a thermoplastic material completing the hose.

The present invention relates to the field of a semiconductor device and provides a longitudinal short-opening grid channel-type HEMT device and a preparation method thereof. The HEMT device comprises a substrate, a buffer layer, a first GaN layer, a second GaN layer, a second barrier layer, a first barrier layer, a dielectric layer, a source electrode, a drain electrode and a grid electrode, wherein the buffer layer is positioned on the substrate; the first GaN layer is positioned on the buffer layer; one side, whic is deviated from the buffer layer, of the first GaN layer is provided with a groove; the second GaN layer and the second barrier layer are sequentially embedded into the groove; the first barrier layer is positioned on the first GaN layer except for the groove; the dielectric layer is positioned on the first barrier layer and the second barrier layer; the source electrode and the drain electrode are in contact with the first GaN layer and the lateral surfaces of the source electrode and the drain electrode are sequentially in contact with the first barrier layer and the dielectric layer from bottom to top; and the grid electrode is in contact with the dielectric layer. According to the present invention, a normally-closed type operation mode of the HEMT device can be obtained; when a large threshold value voltage is realized, on resistance of the device is effectively reduced; and the grid electrode structure also has the characteristics of small capacitor, high switching speed of the device and the like.

Provided is an automatic fixed-length cutting machine for rubber and a cutting method. The automatic fixed-length cutting machine mainly comprises a feeding conveyor belt, a discharging conveyor belt and a middle cutting mechanism. The feeding conveyor belt is driven by an independent feeding motor. The discharging conveyor belt is driven by an independent discharging motor. The cutting mechanism comprises a shearing blade. The shearing blade is driven by a cam and a rotary air cylinder. The feeding motor, the discharging motor and the rotary air cylinder are all controlled by a PLC to be started. According to the automatic fixed-length cutting machine for the rubber, by arranging the feeding conveyor belt, the discharging conveyor belt and the middle cutting mechanism, the PLC is used for control, and the technical problems that the cut length of rubber sheets is unstable, operation and adjustment are difficult in the continuous production process, and the yield of the rubber sheets is low are solved.

The invention relates to a row pile anchoring cement soil pile continuous wall supporting structure. The row pile anchoring cement soil pile continuous wall supporting structure comprises a concrete pavement, row piles, a total-length bonding anchor rod and a single row of cement soil pile continuous wall or multiple rows of cement soil pile continuous walls; the concrete pavement is arranged along the side wall of a foundation trench, and the row piles are close to the concrete pavement to be arranged in the side wall of the foundation trench; and the total-length bonding anchor rod is arranged between the row piles, the front end of the total-length bonding anchor rod is fixed to the concrete pavement through an anchor plate or a prestress locking device, and the tail end of the total-length bonding anchor rod is inserted into the cement soil pile continuous wall/cement soil pile continuous walls in a downwards-inclined manner. According to the supporting structure, the total-length bonding anchor rod is adopted, a stress mechanism is similar to that of a soil nail, and the axial force is small in two ends and large in middle in the length direction, and therefore the axial force of the ends of the anchor rod in the supporting structure is small, and the force transmission effect can be achieved only by arranging the small anchor plate and being in cooperation with the concrete pavement.

The invention relates to an upper thread holding device of a sewing machine, in particular to an upper thread holding device (70) of a button sewing machine (100), comprising a slablike sewing thread catching part (71) with the front end formed into a catching part (71b) catching a sewing thread (T) and moving forwards and backwards, a cylinder (72) fixed on a body frame (F) and ensures that the sewing thread catching part (71) moves forwards and backwards as well as a first leaf spring (73) in elastic connection with the underside (71a) of the sewing thread catching part (71), wherein the first leaf spring (73) applies elastic force on the underside (71a) of the sewing thread catching part (71); the sewing thread catching part (71) ensures that the sewing thread (T) is in slide contact with the surface of the first leaf spring (73) and moves from the front end part (73a) to the butt end part (73b) of the first leaf spring (73), thereby holding the sewing thread (T) caught by the catching part (71b) of the sewing thread catching part (71). The upper thread holding device can reduce the occurrence of sewn degraded product.

A length measuring device for measuring a position in a measuring direction of a first object and a second object displaceable relative to one another. The device includes a hollow profile, a scale and a fastening element. The fastening element includes a first portion designed to fix the scale in stationary fashion in a measuring direction and to fix the first portion in stationary fashion in the measuring direction on the first object to be measured. The fastening element also includes a second portion with which the fastening element is fastened on the hollow profile. The length measuring device further includes a length compensation element provided between the first portion and the second portion of the fastening element, wherein the length compensation element is embodied for enabling motion of the first portion relative to the second portion in the measuring direction.

A hybrid external cavity laser and a method for configuring the laser having a stabilized wavelength are disclosed. The laser comprises a semiconductor gain section and a volume Bragg grating, wherein a laser emission from the semiconductor gain section is based on a combination of a reflectivity of a front facet of the semiconductor gain section and a reflectivity of the volume Bragg grating and the reflectivity of the semiconductor gain section and the volume Bragg grating are insufficient by themselves to support the laser emission. The hybrid cavity laser further comprises an etalon that provides further wavelength stability.

A hybrid external cavity laser and a method for configuring the laser having a stabilized wavelength is disclosed. The laser comprises a semiconductor gain section and a volume Bragg grating, wherein a laser emission from the semiconductor gain section is based on a combination of a reflectivity of a front facet of the semiconductor gain section and a reflectivity of the volume Bragg grating and the reflectivity of the semiconductor gain section and the volume Bragg grating are insufficient by themselves to support the laser emission. The hybrid cavity laser further comprises an etalon that provides further wavelength stability.

A temperature compensation packaging device for a fiber laser comprises a fiber laser, a metal base with a V-shaped groove and a metal cover plate; the fiber laser is composed of a Bragg fiber grating with one end photoetched to optical fiber, the fiber laser is embedded in the V-shaped groove and is in thermal contact with the V-shaped groove, and thermal expansion coefficient of the metal base is far higher than that of the metal cover plate. The temperature compensation technique for passive fiber gratings and the traditional packaging technique for fiber lasers are combined herein, the fiber laser is fixed to a metal structure in order to ensure its reliability and provide temperature compensation effect, the properties of the fiber laser are further improved, and the demands for related scientific research fields and engineering applications can be better met.

The invention relates to a tower whole movement lifting device, which comprises a tower, a main frame, a pipe bending cylinder, and a lifting cylinder. One side on the lower part of the tower is connected with a tower primary leg through a primary leg pin roll hinge support; the bottom of the main frame is provided with a primary leg cylinder; the rear of the main frame is connected with a tower auxiliary leg through a tower pin roll hinge support; the lifting cylinder is arranged on the middle rear of the main frame; the lower end of the lifting cylinder is connected to the main frame through a hinge support, while the upper end is connected to the lower part of the tower through a hinge support; the pipe bending cylinder is arranged on the middle front of the main frame; the lower end of the pipe bending cylinder is connected to the main frame through a hinge support, while the upper end is provided with a bulb; and the bulb is matched with a jacking nest on the middle top of the tower. The device has a smart, compact and reasonable structure, adopts full hydraulic control to lift, and can independently complete whole overturn without assistance of other hoisting equipment.

The present invention relates to a method for manufacturing a preform for optical fibers via a vapor deposition process in which the position of the reversal point near the substrate tube's supply side shifts along the longitudinal axis of the substrate tube during at least part of the deposition process.

The invention discloses a convenient carrier vehicle, which consists of a front vehicle positioned at the front and a trailer positioned at the rear for carrying objects, is provided with three rows of wheels, namely front wheels arranged on a direction lever, rear wheels positioned on a combined part of the front vehicle and the trailer, and trailer wheels positioned at the rear of the trailer, and a driving device, and is characterized in that: the combined part of the front vehicle and the trailer is provided with an expansion or folding device, at least the rear wheels or the trailer wheels are arranged in pairs and in a bilaterally symmetrical mode, and the structure can ensure stable and rapid overland carriage in an extended state and can directly enter and leave an elevator in a shortened state, so that the door-to-door logistics problem in the urban industry is solved.

A control apparatus for a vehicle provided with a step-variable transmission which is disposed between drive wheels and a drive power source including at least an engine, and which is shifted by changing operating states of coupling devices, the control apparatus including an engine stability time estimating portion configured to estimate a length of stability time required for stabilization of an output state of the engine, when a determination to implement a power-on shift-down action of the step-variable transmission is made, and a control portion configured to delay a moment of generation of a shift-down command to implement the power-on shift-down action of the step-variable transmission, with respect to a moment of the determination to implement the power-on shift-down action, where the estimated length of stability time is longer than a predetermined value.

The invention discloses a multi-core-layer inorganic mineral insulation flexible fireproof cable and a preparation method thereof, belonging to the technical field of power cables. The multi-core-layer inorganic mineral insulation flexible fireproof cable comprises cable cores, inorganic mineral insulation layers, filling layers, inorganic mineral wrapping tapes, a metal tube composite layer, an oxygen barrier layer and a flame-retardant outer sheath, wherein each cable core is formed by twisting a plurality of groups of conductive cores, the outer side of each cable core is coated with the inorganic mineral wrapping tape, and the filling layers are arranged between the cable cores coated with the inorganic mineral insulating layers and the inorganic mineral wrapping tapes. The cable has good flexibility and flame retardance, and is excellent in mechanical shock resistance and waterproof performance under the condition of fire.

The invention discloses a steel pipe feeding device with the one-time steel pipe transportation number capable of being adjusted. The steel pipe feeding device comprises a supporting base, and the upper end of the supporting base is sequentially connected with a bed frame, a first supporting rod, a second supporting rod and a supporting frame from left to right. Reinforced rods are arranged between the bed frame and the first supporting rod and in the supporting frame, the bed frame is connected with a supporting plate and a limiting plate, the right side of the limiting plate is connected with a sleeve plate, and the lower end of the supporting plate is connected with the supporting base through the first supporting rod. According to the steel pipe feeding device with the one-time steel pipe transportation number capable of being adjusted, stacking of multiple steel pipes can be avoided, the steel pipes are stably arranged on the supporting plate, the number of the steel pipes transported by a lifting plate and an extending plate can be adjusted conveniently, and then the number of the steel pipes transported by the device at a time can be adjusted conveniently. The steel pipes ona buffering plate can be separated conveniently, and the steel pipes are sequentially arranged on the right side of the buffering plate in order; meanwhile, the kinetic energy of the steel pipe can be relieved so that the steel pipes can stably enter processing equipment to be processed.

An apparatus and a method which enable, in optical angle modulation, measurement of laser light, to measure by a delayed self-heterodyne method, accurate measurement of a temporal waveform of optical angle modulation, without any influence by light intensity modulation, without necessity of for calibration, and without necessity for stabilizing an interferometer. In an optical angle modulation measurement apparatus using a delayed self-heterodyne method, a heterodyne interferometer that is fed with laser light to be measured; a photodetector that receives output light of the heterodyne interferometer and performs heterodyne detection of the output light to output a beat signal; using a phase demodulator that is configured to demodulate a phase of a beat signal; and a temporal waveform analyzer that is configured to obtain a temporal waveform of optical angle modulation, from the phase of the beat signal. In an optical angle modulation measurement method by a delayed self-heterodyne method, laser light to be measured, which is optical-angle modulated is input to a heterodyne interferometer, heterodyne detection of the output light is performed by a photodetector, and a temporal waveform of optical angle modulation is obtained by demodulating a phase of the beat signal.

The invention discloses a method for realizing a fuzzy neuron active queue management method in IPCOP. The method comprises the following steps of: 1, defining and initializing related parameters; 2, waiting for a new data packet; 3, dynamically adjusting the neuron weighting coefficient by use of a derived Hebb learning algorithm, including the steps of sampling the instant queue length q(k) at current moment and calculating the values of the input variables x1(k), x2(k) and x3(k) of the neuron method; 4, dynamically adjusting the neuron grain K by use of a fuzzy control method, including a step of fuzzifying the input variables x1(k) and x2(k) by taking the x1(k) and x2(k) as input and the variation (delta)K of the neuron gain K as output; and 5, calculating the discard probability p(K) and discarding the data packet according to the discard probability p(k), including the steps of calculating the discard probability p(k) and finally discarding the packet according to the discard probability p(k).