31results about How to "Guarantee a tight fit" patented technology

Disclosed is a safety wheel hub with a hidden wheel groove, mainly comprising a movable slide ring lock and an adjustment device matching with same. In a locking state, the movable ring lock can cover the hidden wheel groove, a pressure-loss tire will not be drawn into or break away from the wheel groove when blowing out, and forms a rubber pad using the thickness thereof, thereby endowing a wheel with normal functions of transmitting traction force, braking force, steering force, etc. to the ground, and guaranteeing that a vehicle with a tire that blows out will not be out of control. In an unlocking state, the hidden wheel groove is exposed. The wheel hub structure is the same as that of the traditional design, thereby not affecting the normal disassembling and assembling of the tire.

The invention discloses a maintenance-free fully-preventive floor drain, comprising a hollow floor drain core, wherein a seal plate for spacing the upper and lower parts of the floor drain core is arranged in the floor drain core, a water outlet is arranged on the seal plate, a water retaining structure is arranged below the seal plate and comprises a lever, a rotating shaft used as a lever fulcrum, a clump weight arranged at one end of the lever and a water-retaining plate arranged between the water outlet and the other end of the lever, the water-retaining plate is in rotary connection with the rotating shaft and is used for seal fit with the water outlet, and the moment of the clump weight is greater than the moment of the water-retaining plate. The invention aims at providing the maintenance-free fully-preventive floor drain which is capable of thoroughly solving the problem of hair fiber accumulation, has good seal effect and prevents blow-by.

The invention discloses an underground diaphragm wall air bag type interface box and a use method thereof. The underground diaphragm wall air bag type interface box comprises an air bag, a reinforcement cage and fixing buckles, wherein interface grooves are formed in the two sides of the reinforcement cage; multiple buckle fixing ribs are arranged on the outer sides of the interface grooves; the air bag is located inside the interface grooves; the section of the air bag is rectangular; a charging connector is arranged at the upper end of the air bag; pulling-out lifting handles are arranged on the two sides of the charging connector; the fixing buckles are located inside the buckle fixing ribs; and the air bag and the fixing buckles are fixed to one another in a mutual squeezing mode. The use method comprises the first step of machining of the air bag, the second step of machining of reinforcing steel bars, the third step of installation of the air bag, the fourth step of sinking of the reinforcement cage and pouring of concrete, and the fifth step of pulling out of the air bag.

The invention discloses a closing-in sectional material mounting structure matched with door leaves of different specifications. An outer door face is arranged on the outer side of a door steel structure body of a door leaf, an inner door face is arranged on the inner side of the door steel structure body of the door leaf, and the door steel structure body of the door leaf is installed in a door frame; a decorative plate covering panel combined mounting structure comprises a large panel closing-in sectional material mounting structure and a small panel closing-in sectional material mounting structure; a large panel closing-in sectional material of the large panel closing-in sectional material mounting structure comprises a large panel closing-in sectional material main body, a large panel closing-in sectional material supporting plate, a large panel closing-in sectional material closing-in baffle and a large panel closing-in sectional material sealing strip containing opening; and a small panel closing-in sectional material of the small panel closing-in sectional material mounting structure comprises a small panel closing-in sectional material main body, a small panel closing-in sectional material supporting plate, a small panel closing-in sectional material closing-in baffle, a small panel closing-in sectional material sealing strip containing opening and a small panel closing-in sectional material covered edge clamping groove. According to the closing-in sectional material mounting structure matched with the door leaves of different specifications, corresponding closing-in sectional materials are matched with different door leaves for installation, the universality is high, the sectional materials are provided with sealing strip containing openings and corner combining device containing openings, and the good narrowing effect is achieved.

The invention relates to a stacked exterior wall with a multilayer structure. The stacked exterior wall comprises a plurality of wallboards which are nested together from bottom to top to form the exterior wall. Each wallboard comprises an outer board, an inner board and a middle board, wherein the outer board and the inner board are positioned on two sides, the middle board is positioned between the outer board and the inner board, upper ends of the outer board and the inner board are provided with first clamping parts respectively, lower ends of the outer board and the inner board are provided with second clamping parts respectively, the first clamping parts and the second clamping parts can be matched in shape and tightly clamped together, the upper end of the middle board is provided with a trapezoidal head, the lower end of the middle board is provided with a trapezoidal groove higher than the trapezoidal head, and the trapezoidal head can be clamped in the trapezoidal groove. As each wallboard comprises an inner layer, a middle layer and an outer layer, the exterior wall can be assembled by stacking the wall boards layer by layer without structural distinguishing of each layer, so that convenience in assembly is achieved. In addition, the inner layers, the middle layers and the outer layers of the wall boards own form integral inner, outer and middle layer structures of the exterior wall, and functions of water resistance, thermal insulation and the like corresponding to each layer structure are unaffected.

The invention provides a production line for roller-coated color steel plates. Steel bands at all process sections are flattened through a plurality of tension rollers and stable and constant tension is particularly provided for a roller coating section. Moreover, since corona treatment is conducted to the surfaces of the steel bands before the steel bands enter the roller coating section to form a plurality of pits on the surfaces of the steel bands, the surface roughness of the steel bands is improved, the adhering force between the surfaces of the steel bands and color pattern layers is improved, the color pattern layers are not apt to peel off and the formability of the steel bands is improved.

The invention relates to a space-ray-tracing-based method for designing a secondary mirror hood and a square-tapered extinction cone. The method comprises: step one, establishing a Cartesian rectangular coordinate system used during a design process; step two, establishing auxiliary light in a meridian plane and a sagittal surface and carrying out calculation to obtain a boundary of a square-tapered main mirror central-hole extinction cone; step three, determining the position and configuration of the tail end of the square-tapered main mirror central-hole extinction cone; step four, definingan initial structure of a secondary mirror hood; step five, constructing a spatial auxiliary ray and carrying out calculation to obtain the position and configuration of the front end of a square-tapered extinction cone; step six, setting a point light source set at the edge of a conical surface, carrying out ray tracing, carrying out statistics of light source numbers with light leakage possibility, and increasing the size of the conical surface correspondingly; step seven, determining final spatial positions and three-dimensional configuration of the tail end and the front end of the square-tapered main mirror central-hole extinction cone; and step eight, carrying out calculation to obtain three-dimensional configuration of the secondary mirror hood.

The invention belongs to the technical field of explosion-proof diesel engine air inlet shutoff devices, and particularly relates to an explosion-proof diesel engine dual-fan air inlet shutoff device.The problems that an existing explosion-proof diesel engine air inlet shutoff device needs high acting force to shut off, the sealing effect is poor after shutting off, and serious air leakage is caused are solved. The explosion-proof diesel engine dual-fan air inlet shutoff device comprises a shell body and two rotating shafts symmetrically arranged in the shell body. Each rotating shaft is provided with an air door, and the air doors are each in a semicircle disk shape. According to the explosion-proof diesel engine dual-fan air inlet shutoff device, air inlet shutoff is achieved by using the function of air flow, the shutoff speed is high, the sealing effect is good, the motion is reliable, the structure is compact, the needed air cylinder force is small, and the explosion-proof dieselengine dual-fan air inlet shutoff device is ideal and can also be applied in the field of other pipeline airflow shutoff.

The invention discloses a tightly fit injection mold locker which comprises a locking seat, a locking sleeve, U-shaped fixing irons and a safety strip, wherein an adjusting bolt, a clamping wheel, upper circular holes and a clamping groove are arranged and formed in the locking seat; the adjusting bolt and the clamping wheel are embedded into the locking seat; a belleville spring is arranged below the adjusting bolt; an ejection plate is arranged below the belleville spring; internal rolling wheels are arranged below the ejection plate; the internal rolling wheels are in rolling connection with the clamping wheel; a cavity is formed between the clamping wheel and the locking seat; the locking sleeve is provided with lower circular holes and semicircular grooves; the semicircular grooves and the locking sleeve are molded integrally; the U-shaped fixing iron is mounted in the upper circular holes and the lower circular holes; and the safety strip is mounted in the clamping groove.

The invention discloses a tightly fit injection mold locker which comprises a locking seat, a locking sleeve, U-shaped fixing irons and a safety strip, wherein an adjusting bolt, a clamping wheel, upper circular holes and a clamping groove are arranged and formed in the locking seat; the adjusting bolt and the clamping wheel are embedded into the locking seat; a belleville spring is arranged below the adjusting bolt; an ejection plate is arranged below the belleville spring; internal rolling wheels are arranged below the ejection plate; the internal rolling wheels are in rolling connection with the clamping wheel; a cavity is formed between the clamping wheel and the locking seat; the locking sleeve is provided with lower circular holes and semicircular grooves; the semicircular grooves and the locking sleeve are molded integrally; the U-shaped fixing iron is mounted in the upper circular holes and the lower circular holes; and the safety strip is mounted in the clamping groove.

The invention discloses a cabin door mounting method. The method is characterized by comprising the following steps of: cutting a part of a cabin as a cabin door, and spot-welding the cabin door on the cabin; erecting a rotary shaft on a lower supporting plate and sleeving the upper end of the rotary shaft with an upper supporting plate; irradiating the rotary shaft by a first gradienter, wherein vertical glaze released by the first gradienter irradiates the surface of the rotary shaft, observing whether the projection of the vertical glaze released by using the first gradienter on the surface of the rotary shaft is located on a central line of the rotary shaft in the direction or not, if not, knocking on the upper supporting plate to correspond; arranging a second gradienter on one side of the first gradienter; and irradiating the rotary shaft by using the second gradienter, wherein vertical glaze released by the second gradienter irradiates the surface of the rotary shaft, observing whether the projection of the vertical glaze released by using the second gradienter on the surface of the rotary shaft is located on the central line of the rotary shaft in the direction or not, if not, knocking on the upper supporting plate to correspond.