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

The invention discloses a wave plate falling device of a welded metal corrugated pipe, which is mainly characterized in that a lower die assembly comprises a lower die base, a cutting die, an external pressure plate and an internal pressure plate. The upper end of the cutting die protrudes out of the top face of the lower die based and the top face of the cutting die is in a wave plate curve face. The external pressure plate is attached to the outer wall of the cutting die. The top face of the external pressure plate is aligned with the side face outside the cutting die and forms a first chamfered angle with the top end of the external pressure plate at the attached place of the cutting die. The internal pressure plate is placed in the cutting die, and the bottom face thereof leans against the lower die base through an elastic mandrill. The internal pressure plate is attached to the inner wall of the cutting die, and the to top face of the internal pressure plate is aligned with the highest point on the top face of the cutting die and forms a second chamfered angle with the top end of the internal pressure plate at the attached place of the cutting die. An upper die assembly comprises a rubber template fixed on the bottom face of the upper die base. The bottom face of the rubber template is planar. The rubber template flexibly squeezes, molds and cuts the wave plate, and the squeezing stress of the wave plate is small, so that the wave plate does not deform in case of stress recovery, and the molded wave plate is accurate in parameters and burr-free.

The invention discloses a water pump convenient to assemble and good in stability. The water pump comprises a mounting plate, a machine body is mounted on the upper end of the mounting plate, two connecting pipes are mounted on one side of the machine body, a sleeve ring is fixed to one ends of the connecting pipes, the connecting pipes are slidingly sleeved with sliding sleeves, two sleeves are mounted on the sleeve ring in a penetrating manner, and ejector rods are sleeved with the sleeves. The water pump can be rapidly and conveniently connected with an external water pipe with a flange disc, the connection method is simple, through the multiple manners, connection firmness is ensured, connection seal is improved, the leakage condition is avoided, the application range can be effectively improved, the water pump can be conveniently connected with external water pipes of multiple specifications, meanwhile, during operation, whole stability can be well ensured, when the water pump isnot used, the protection capacity is improved, connecting parts are prevented from being damaged, the influence of vibration or collision on the machine body can be avoided, the service life is prolonged, and work quality during use can be ensured.

A telescopic lifting beam used for a coal mine monorail locomotive belongs to the technical field of coal mine machinery and solves the technical problems of transporting and placing stacked supports. The device includes a load-bearing beam, a load-carrying trolley and a telescopic arm. The direction of the upper chute and the lower chute are set respectively, and the upper chute and the lower chute are set as one-sided openings. The opening ends of the upper chute and the lower chute are in opposite directions. The end of the free end of the telescopic arm is provided with an overturn cylinder along the horizontal direction, and the overturn cylinder drives the overturn mechanism to rotate around the hinge position; Retract; the top support cylinder drives the top support mechanism to rotate around the root. The present invention adopts a unique hoisting method inside the frame of the stacked bracket, fully utilizes the stretching stroke of the stacked bracket itself, and can adapt to the harsh working environment under the mine.

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 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 discloses a wave compensating device for ascending operation of a high-rise pile cap, and belongs to the technical field of basic maintenance work of offshore wind piles. The wave compensating device comprises a horizontal ladder part, a hydraulic drive compensation mechanism and a base mechanism, wherein the hydraulic drive compensation mechanism is arranged on the base mechanism; the horizontal ladder part is arranged on the hydraulic drive compensation mechanism; the hydraulic drive compensation mechanism drives the horizontal ladder part to move; and the base mechanism is arranged on a bearing hull. The wave compensating device is driven by a hydraulic device to control a hydraulic cylinder to stretch and contract; and when a ship carries out three-degree-of-freedom motion of rolling, pitching and heaving, effective compensation is achieved, so that a worker more safely passes a horizontal ladder. Feedback control is adopted by the wave compensating device for ascending operation of the high-rise pile cap, so that the wave compensating device is strong in anti-jamming capability, good in adaptability, high in compensation accuracy and stable in compensation performance.

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.