33results about How to "Reduce uneven stress" patented technology

The invention relates to a precast stair mold and a precast stair machining process. The mold comprises a supporting frame, wherein a bottom plate is arranged on the supporting frame, a side mold bodyand a stair mold body are connected to the bottom plate in a sliding mode, the bottom plate, the side mold body and the stair mold body are matched in an abutting mode to jointly form a pouring cavity, the stair mold body comprises a stair support, the stair support is arranged on the bottom plate and slides, a plurality of adjacent shaping plates are connected to the stair support in a sliding mode, the ends, close to the side mold body, of the shaping plates are in a right-angle shape, movable rods are in threaded connection with the stair support, and one end of each movable rod is rotationally connected with the corresponding shaping plate. When the precast stair is demolded, the shaping plates are sequentially separated from the precast stair, step-by-step demolding is realized, thesituation that stress is uneven during demolding is reduced, the precast stair is easily separated from the stair mold in the demolding process, and the effect of improving the quality of the precaststair is achieved.

The invention discloses a process and a device for producing a thin prepreg. The process comprises the impregnation process; and before the impregnation process, a reinforcing material is arranged on a carrier so that the carrier directly acts on a roll shaft to share the acting force applied by the roll shaft on the reinforcing material. By arranging the reinforcing material on the carrier before the impregnation, the roll shaft can be prevented from being directly contacted with the reinforcing material, the pulling force directly applied from a device to the reinforcing material is effectively reduced, the condition that the reinforcing material is partially stressed unevenly is reduced, the thin reinforcing material is protected particularly, such phenomena as dislocation, shape change and tearing of the thin reinforcing material and the ultrathin prepreg are reduced, and the production efficiency and product percent of pass are improved.

The invention relates to the technical field of sewage treatment, and discloses a sewage oxygen charging device. The device comprises an aeration tank body, a first rotation rod and a rotation sleeve. The rotation sleeve is provided with a rotation hole. The first rotation rod is placed in the rotation hole. The first rotation rod is connected with the rotation hole in dynamic sealing mode. The inner wall of the rotation hole is annularly provided with a revolving groove. A second gas transmission channel is communicated with the revolving groove. The rotation sleeve is provided with a fourth gas transmission channel which is communicated with the revolving groove. The fourth gas transmission channel is communicated with the side wall of the rotation sleeve. The rotation sleeve is provided with a second slide bearing face which is a partial spherical surface sharing the same center with the first slide bearing surface. The second slide bearing face is loaded on the first slide bearing face. When the first rotation rod makes a small angular swing in any direction relative to an output shaft, the rotation sleeve along with the first rotation rod make a displacement in a deflection cavity, thus effectively relieving the uneven stress between the rotation sleeve and the first rotation rod, and stabilizing the dynamic sealing between the rotation sleeve and the first rotation rod.

The invention provides a bridge turning device for traffic construction bridge construction. The bridge turning device for traffic construction bridge construction comprises a mounting platform, four positioning steel bars which are fixedly mounted at the top of the mounting platform and are distributed in a rectangular array, a positioning steel framework which is fixedly mounted on the four positioning steel bars, a spherical hinge lower disc which is fixedly mounted at the top of the positioning steel framework, and a lower spherical hinge which is fixedly mounted at the top of the spherical hinge lower disc. The bridge turning device for traffic construction bridge construction has the advantages that operation is easy, the phenomenon of uneven stress is reduced, and the phenomena of blocking and the like are avoided.

The invention discloses a mask strip structure for a special-shaped screen and a manufacturing process thereof. The mask strip structure comprises a mask strip plate, the mask strip plate is provided with a plurality of groups of effective areas distributed at equal intervals, the effective areas are quartz photomasks, the outer sides of the effective areas are provided with surrounding layers, the surrounding layers are etching areas, the etching areas are arranged in a rectangular shape, buffer areas are arranged between the effective areas and the corresponding etching areas, a plurality of groups of through holes are uniformly distributed in the effective areas, and a plurality of groups of non-through holes are uniformly distributed in the buffer areas. According to the mask strip structure, the net stretching yield of the mask strip plate for the special-shaped screen can be improved, and the net stretching efficiency is improved; and according to the structure of the mask strip plate, the phenomenon of uneven stress of the special-shaped screen is relieved, the problem of wrinkles is solved, the color mixing risk is reduced, and the color mixing phenomenon is improved.

The invention discloses an elevated steel-concrete composite beam which comprises a cross beam and a pier stud, the cross beam is fixedly connected to the top of the pier stud, transmission bases areslidably connected to the two sides of the bottom of the inner wall of the cross beam, sliding bases are slidably connected to the sides, away from each other, of the two transmission bases, and steelbeams are fixedly connected to the tops of the two sliding bases. The tops of the two steel beams penetrate through the cross beam and extend to the position above the cross beam, a concrete plate isfixedly connected between the tops of the two steel beams, rectangular grooves are formed in the bottom of one transmission base and the top of the other transmission base, and the two transmission bases are symmetrically connected to the bottom of the inner wall of the cross beam in a staggered and sliding mode. The two sides of the bottom of the concrete slab are stressed at the same time and do not descend any more, the force is decomposed and converted, the situation that the concrete slab is stressed unevenly is reduced, the stability of the overall structure of the concrete beam is improved, the underpinning is in a straight rod shape, longitudinal and horizontal stress is conducted, and the bending phenomenon is avoided.

The invention relates to a transport component and a transport method suitable for wide and large-span prefabricated slabs, the transport component comprises a bearing seat, the bearing seat comprises a supporting pin seat and two supporting beams, the supporting beams are arranged on the supporting pin seat in a penetrating mode, two limiting beams are installed on the supporting beams, and the limiting beams can slide along the supporting beams in a reciprocating mode and are fixed to the supporting beams; the supporting seat comprises a supporting base and a supporting top seat which is spirally connected to the supporting base; and the damping seat comprises a damping base, a connecting seat, a damping top seat, a plurality of limiting rods and a plurality of first damping springs, the connecting seat is spirally installed on the damping base, the limiting rods are installed on the connecting seat, the first damping springs are arranged on the limiting rods in a penetrating mode, and the damping top seat is arranged on the limiting rods in a penetrating mode. The components are located on the same horizontal plane through the supporting seat and the bearing seat, so that the situation that the stress of the components is not uniform is greatly reduced, and the situation that the components are damaged due to the non-uniform stress in the transportation process is avoided.

The invention provides a semiconductor device and a heat sink bonding method, and relates to the technical field of semiconductors, and the method comprises the steps: forming an epitaxial layer on a substrate, wherein the epitaxial layer forms at least one current injection region and non-current injection regions located on the two sides of the current injection region, and an isolation region is formed between the current injection region and the non-current injection region; forming a metal layer on the epitaxial layer, wherein the metal layer covers the current injection region, the non-current injection region and the isolation region; forming a plurality of electric conduction and heat conduction structures on the metal layer, forming gaps between adjacent electric conduction and heat conduction structures, and arranging a plurality of electric conduction and heat conduction structures on each non-current injection region; forming a welding layer on the plurality of conductive and heat-conducting structures, wherein the welding layer covers the conductive and heat-conducting structures, the gap and the metal layer; and welding the heat sink and the welding layer. The electric conduction and heat conduction structure ensures that the current injection region is not stressed, and welding stress concentration is reduced when the heat sink is welded; the formation of the metal layer and the conductive and heat-conducting structure reduces the welding stress of the heat sink and the semiconductor device, and reduces or avoids local distortion of the semiconductor device caused by welding.

The mask strip structure comprises a metal mask strip body, U-shaped grooves with outward openings are formed in the middles of the two ends of the metal mask strip body, and a plurality of sets of etching areas distributed at equal intervals are arranged on the surface of the metal mask strip body. The etching area comprises an effective area which is circularly arranged and a buffer area which is positioned on the outer side of the effective area and is rectangularly arranged. A double-sided etching process is adopted in the effective area, and after double-sided etching is conducted on the metal mask strip body, through holes are formed. A double-face etching and single-face filling technology is adopted in the buffer area, and a groove etched in the front face of the buffer area is filled with a barrier layer of 1-3 microns. According to the metal mask strip, the net stretching yield of the metal mask strip body for the special-shaped screen can be increased, the net stretching efficiency is improved, the phenomenon of uneven stress of the special-shaped screen is relieved through the structure of the metal mask strip body, the wrinkle problem is solved, the color mixing risk is reduced, and the color mixing phenomenon is improved.

The invention relates to a small-sagittal-degree-difference cableway bridge, and belongs to the field of bridge engineering. According to the cableway bridge, steering pulleys are arranged on an anchorage, two or more adjacent main cables are enabled to be connected with each other, the sagittal degrees of the main cables connected with each other are kept consistent all the time, meanwhile, the absolute deflection difference is reduced by connecting the main cables, the number of the main cables of the whole bridge is reduced by 1/2-2/3 compared with the number of the main cables of a commoncableway bridge, even the whole bridge is formed by a steel wire rope, so that the absolute sagittal degree difference is reduced, even the deflection is equal, and the stress of the main cable is improved. According to the cableway bridge, the absolute sagittal degree difference of the free main cables can be reduced, a new main cable difference generated in the running period can be automatically coordinated to reduce the absolute sagittal degree difference or eliminate the main cable deflection difference, the deflection difference of the free main cables of the cableway bridge can be effectively improved, the situation of uneven stress between the plurality of main cables can be reduced, and the main cable deflection difference generated in the running process of the cableway bridge can be reduced.

The invention discloses a steel-concrete composite beam which comprises a base, transmission bases are slidably connected to the two sides of the bottom of the inner wall of the base, sliding bases are slidably connected to the sides, away from each other, of the two transmission bases, steel beams are fixedly connected to the tops of the two sliding bases, and the tops of the two steel beams penetrate through the base and extend to the upper portion of the base. By pushing the transmission base on the left side rightwards, teeth in the rectangular groove in the transmission seat also move rightwards along with the transmission seat, so that the gear is driven to rotate, the teeth below the gear are driven to move rightwards, the other transmission seat is driven to move rightwards from the left side of the base, and the supporting point at the bottom of the sliding base on the other side is lowered; the top of the right sliding seat is stressed by the other steel beam and the right side of the concrete plate, so that the right sliding base slides downwards, the two sides of the concrete plate are balanced, the self-adjusting balance performance of the steel-concrete composite beamis improved, the situation that the composite beam is broken due to the fact that one end is stressed to incline is prevented, and the service life of the steel-concrete composite beam is prolonged.

The invention discloses a carbon fiber composite hydrogen storage tank preformed body weaving forming method. The method comprises the following steps that size design is carried out according to a hydrogen storage tank preformed body, inner layer forward fiber weaving is carried out on the surface of a hydrogen storage tank core mold, then fiber winding is carried out, and reverse fiber weaving is carried out on an outer layer. The weaving process is started from the head of the hydrogen storage tank, weaving is conducted to the tail of the hydrogen storage tank for a stroke, the tail is fixed through an adhesive tape or a ribbon, then weaving is conducted again, fiber winding is conducted after the preset thickness of the inner layer is achieved, and finally reverse weaving is conducted on the wound outer layer. The hydrogen storage tank is preformed in a forward weaving-winding-reverse weaving mode, the phenomenon that fibers of a hydrogen storage tank preformed body are uneven in longitudinal and transverse stress due to single weaving or winding can be avoided, the wrapping performance of the hydrogen storage tank preformed body is improved, meanwhile, raw materials can be saved, and the weaving cost can be reduced.