31results about How to "Small amount of expansion and contraction" patented technology

The invention discloses a support system for a long-span cable-stayed bridge, which relates to the technical field of bridge engineering. The support system consists of nine parts including main girders, bridge towers, stay cables, transitional piers, transverse wind resisting bearings, longitudinal viscous dampers with limiting function, longitudinal sliding bearings with limited transverse rigidity, transverse dampers, and telescopic devices. Compared with the prior support system for the long-span cable-stayed bridge, the support system of the invention has the characteristics that the longitudinal viscous dampers with limiting function are arranged between the main girders and the bridge towers; and the longitudinal sliding bearings with limited transverse rigidity and the transverse dampers are arranged between the main girders and the transitional piers. The support system provides effective rigidity and damping for the long-span cable-stayed bridge to ensure that the static force and the dynamic force responses of the bridge are controlled in an acceptable scope; the structural stress is definite; and the applicability is strong.

The invention discloses a slipping type seamless telescopic device. A telescopic seam is arranged between main beams, upper surfaces of the main beams are provided with comb plates, and the comb plate arranged at the upper part of the telescopic seam is a trans-seam comb plate, and a fixing comb plate is connected with the trans-seam comb plate; a top paving layer is arranged at the upper part of the trans-seam comb plate, and both sides of the top paving layer are respectively provided with elastomer prefabricating blocks; left and right sides of the elastomer prefabricating blocks are respectively arranged with bituminous concrete paving layers. The slipping type seamless telescopic device and a bridge face paving layer can be formed to be a continuous body, so as to guarantee stable and comfortable driving; the driving noise is small and waterproof performance is good, and the slipping type seamless telescopic device is convenient to clean and remove snow, and other maintaining works; the structural design is more reasonable, and construction is convenient; the comb plates are respectively arranged beneath the paving layer and above the main beam, and can be fixedly moved; and thereby, the problem of empty lower part of the tooth end of the comb plate is effectively solved, and the shortcoming that the traditional seamless telescopic device is easy to crack is overcame.

The present invention relates to a kind of oiled polyvinyl harness flex for jacquard and its production process. The oiled polyvinyl harness flex is produced with light yellow polyvinyl yarn and white filtering polyvinyl yarn as material and through twisting, sizing and wax oil soaking. The produced oiled polyvinyl harness flex has yellow and white pattern, modulus 10-20 % higher than that of available one, small extension and less moisture influence.

The invention relates to a double-layer automatically adjustable suspension suitable for hilly mountainous areas. Each of four corner parts of a lower hydraulic pressure independent adjustment suspension is provided with a lower suspension hydraulic function unit, and the middle parts of four beams of a lower suspension is provided with first horizontal sensors; each lower suspension hydraulic function unit is independently controlled, and the levelness of the lower suspension is adjusted in real time according to the monitoring data of each first horizontal sensor; an upper hydraulic synchronous interconnect suspension is fixedly arranged on the upper part of the low suspension, and the upper suspension hydraulic functional units are divided into two groups of upper suspension front framehydraulic functional units and upper suspension rear frame hydraulic functional units, and each group is provided with a synchronous motor; second horizontal sensors are arranged in the middle of thecross beams on both sides of the upper suspension, and a pair of hydraulic cylinders on each of the front and rear sides of the lower suspension are synchronously controlled. The four suspension independently and automatically adjust a driving posture of the vehicle in real time when the vehicle is traveling on the uneven road surface. At that same time, the level of the drive's sitting posture can be kept when the vehicle ascends or descend a slope.

The invention discloses a shockproof packaging box of an optical splitter. The shockproof packaging box of the optical splitter comprises a packaging box body. An optical fiber coil-in hole is formed in the right end surface of the packaging box body, and a row of optical fiber coil-out holes are formed in the right end surface of the packaging box body. An optical fiber protector is arranged in the center of the inner surface of the packaging box body. An installation base is arranged on the portion, close to the optical fiber coil-in hole, of the inner surface of the packaging box body. A steel pipe sleeve is installed on the installation base in a supporting mode, and a buffering shockproof layer is arranged between the interior of the steel pipe sleeve and the planar light wave circuit splitter and attached to the inner surface of the steel pipe sleeve closely. According to the shockproof packaging box of the optical splitter, through the improvement of the internal structure of the optical splitter, the optical splitter can conform to 'technical requirements for passive optical splitter of China telecom' when mechanical performance tests of the optical splitter are carried out, and the service life of the optical splitter is prolonged effectively.

The invention discloses a box opening and conveying device, belongs to the field of packaging machinery, and solves the problems that the conventional manual box opening efficiency is low and the cost is high. According to the technical scheme, the box opening and conveying device mainly comprises a box opening assembly, a lifting assembly and a conveying assembly; the box opening assembly comprises a box opening driver and box opening operating parts; the box opening driver drives the box opening operating parts to do linear reciprocating movement, and under the driving of the box opening driver, the moving direction of at least one box opening operating part is opposite to that of another box opening operating part under the driving of the box opening driver; each box opening operating part is provided with a guiding surface and an inserting end; the guiding surfaces are inclined relative to the moving direction of the opening operating parts under the driving of the box opening driver; the inserting ends are positioned at one ends of the guiding surfaces; the conveying assembly is provided with a cyclic conveying route and positioning components distributed on the conveying route; and the moving range of the box opening assembly driven by the lifting assembly is superposed with that of the positioning components. The box opening and conveying device is mainly used for box opening and conveying operations of packaging boxes.

The invention relates to the field of mechanical manufacturing, and in particular relates to a machining process of a gear/gear sleeve with a large diameter. The machining process comprises the following steps of: step 1, forging; step 2, isothermal normalizing; step 3, machining; step 4, carburizing; step 5, quenching via a pressing machine; step 6, tempering; step 7, lathing of an inner bore; step 8, gear pairing; step 9, shot blasting; step 10, phosphating; and step 11, warehousing. The quenching is carried by using the pressing machine, so that influences of various potential distortion factors existing during the machining and the heat treatment of materials in a production process can be removed or reduced under the action of the pressure. According to the machining process provided by the invention, the distortion of the gear/gear sleeve to be machined is controlled in an acceptability limit; and the problem of surface decarburization is basically eliminated.

The invention relates to a train. Air supply braking pipelines located between adjacent carriages of the train are connected through train end connecting devices; each train end connecting device comprises a connecting pipe seat mounted below the centering position of a coupling gear of the adjacent carriages as well as connecting hoses, one end of each connecting hose is connected with a connecting port, and the other end of each connecting hose is connected with the air supply braking pipeline of the corresponding carriage. The train has the advantage that the overall connecting pipelines occupy small space, transverse and longitudinal swinging of the train is effectively borne, and hose wear and pulling and dragging risks due to interference formed by the hoses and the coupling gears inthe swinging process are avoided; the air supply braking pipelines are not required to be cut off manually again during disassembling and reconnecting; by means of the connecting pipe seats, the pipelines are collected to a longitudinal center of the train, so that expansion and contraction quantity of the pipelines due to coupling gear swinging is greatly reduced, pulling and dragging of the connecting hoses are avoided, and randomness and flexibility of connection are increased. The train is applicable to all vehicle models adopting double-pipe air supply.

The invention provides a household electrical appliance and a foot of the household electrical appliance. The foot comprises a protective sleeve which is fixed at the bottom of the household electrical appliance, an adjusting foot which is arranged in the protective sleeve and capable of moving relative to the axial direction of the protective sleeve, a flexible body assembly in which a hydraulicmedium is contained, wherein the flexible body assembly comprises a flexible telescopic part arranged in the adjusting foot which is driven telescopically to move in the axial direction by the flexible telescopic part under the action of pressure force for leveling, a friction damping assembly which is arranged between the protective sleeve and the adjusting foot for generating frictional dampingto damp the vibration of the household electrical appliance and an elastic buffering component which comprises an elastic buffering end part abutted against the adjusting foot used for buffering the vibration of the household electrical appliance. According to the foot, a better leveling effect is achieved by matching the friction damping assembly and the elastic buffering component with the hydraulic medium in the foot of the household electrical appliance, and better absorbing and adjusting effects can be achieved particular aiming at the vibration generated in the dehydrating process of a washing machine to reduce dehydrating vibration and dehydrating noise.

The invention discloses a slide-type drive shaft for a large-swing-angle dustproof sleeve, and mainly solves the problems that breakage and oil leakage of a dustproof sleeve are easily caused due to ahigh shrinkage amount of a dustproof cover during slide of an existing drive shaft, so that the service life of the drive shaft is shortened. The slide-type drive shaft for the large-swing-angle dustproof sleeve is characterized by further comprising a slide element (5), wherein the slide element is slidably arranged on the circumferential outer wall of a middle shaft in the axial direction of the middle shaft; and one end of a first dustproof cover is connected with the slide element, and the other end of the first dustproof cover is connected with the outer wall of a shell body. According to the slide-type drive shaft for the large-swing-angle dustproof sleeve, the dustproof sleeve uses a slide function while being connected with the middle shaft, so that the stretching amount of the dustproof sleeve is reduced, the breakage problem of the dustproof sleeve is greatly reduced, and the service life of the drive shaft is prolonged.

The invention discloses a horizontal opening wind tunnel-based steel rod support oscillation test mechanism, which comprises a model support device, a main body frame and two sets of driving devices; the main body frame is fixedly mounted on an upper turntable and a lower turntable of a horizontal opening wind tunnel test section and performs sideslip movement along with the turntables; the two sets of driving devices are symmetrically and fixedly installed on supporting columns on the two sides of the main body frame, the model supporting device is connected with the power output ends of the two sets of driving devices, each set of driving device is provided with a detection unit, and the two sets of detection units guarantee that the driving devices on the two sides move synchronously; and the model is driven by the two sets of driving devices to do sine oscillation motion with a given rule. According to the invention, the problem of serious interference of a dynamic test support is fundamentally solved; meanwhile, the steel rod support oscillation test mechanism has the characteristics of small expansion and contraction amount, accurate model installation and positioning and high motion index precision; in addition, the problem of interference of the closed wind tunnel wall can be effectively solved, the working difficulty and workload of data correction are reduced, and the accuracy of test data is improved.

The invention discloses a liftable and bendable side spraying shower, which comprises a fixed part, a side spraying device and a swing arm water outlet mechanism, the side spraying device can be connected to the fixed part in a liftable manner, and the swing arm water outlet mechanism can be connected to the side spraying device in a swinging manner and can swing between a first position and a second position, the first position is aligned with the side spraying device to form side spraying, and the second position is bent relative to the side spraying device. The shower has the advantages that the shower is provided with the side arm water outlet, the swing arm water outlet and the handheld water outlet, the rotating shaft is arranged between the side arm water outlet and the swing arm water outlet, and the swing arm water outlet can rotate around the rotating shaft to adjust the water outlet angle, so that more shower requirements can be met.

The invention belongs to the technical field of moving devices, discloses a walking wheel type moving device and a control method thereof, and aims to solve the problem that the energy utilization rate is low due to the fact that driving of wheels of an existing wheel step type moving device and movement of supporting legs of the existing walking wheel type moving device are mutually independent. When the moving device adopts a front wheel set and a rear wheel set to normally move, a power transmission route is an internal combustion engine-ISG motor-driving motor-front and rear wheels and the rear wheel set, and redundant electric energy generated by redundant ISG motors is stored in a power battery; when the moving device adopts a front supporting leg, a middle supporting leg and a rear supporting leg to climb over obstacles, the power transmission route is the combination of the internal combustion engine, the power motor, the ISG motor, the oil pump and the supporting legs. Therefore, on the premise that the supporting legs can drive the moving device to move, energy consumption can be reduced.

The formula of pinenut kernel fruit juice contains 5-15% of pinenut kernal, 5-10% of white sugar, 0.1% of preservative and 75-90% of water, its production method includes the following steps: placing peeled pinenut kernal in emulsifying tank, injecting 5% of rice vinegar and soaking for 10-12 hr. then placing the soaked pinenut kernel in emulsifying tank, adding 35 of edible alkali liquor and soaking 10-12 hr., using three washing tanks in turn to wash to remove soft peel and alkaline substance, grinding to obtain the invented pinenut fruit juice beverage with rice nutrients.