36results about How to "Bearing area reduced" patented technology

An anode target is roratably supported by a rotating mechanism having a rotary body and a staionary body. A fitted portion between the rotary body and the stationary body is formed of bearing areas having dynamic pressure type sliding bearings and a non-bearing area having a clearance between the rotary body and the stationary body larger than that in the bearing areas. The rotary body facing the non-bearing area is positioned where a time for heat transfer from the anode target is shorter than the rotary body facing the bearing areas. Thus, the characteristics of heat radiation from the anode target can be improved, and a stable bearing operation can be maintained.

The invention provides a rectifying method by drilling at intervals and pile cutting off. The method includes excavating at least two constructing wells along the longitudinal direction of the light settlement side, communicating all the constructing wells, excavating a plurality of horizontal roadways, determining the pile cutting height of each concrete pile from the light settlement side to the heavy settlement side in a same row of concrete piles according to designed maximum rectifying amount by the principle of similar triangles, cutting off piles in batches, and arranging a pre-reserved stripe between two adjacent pile-cutting holes on one concrete pile; rectifying by the own weight of an inclined building and force of an anchor cable arranged at the light settlement side until a rectifying target is achieved; patching the pile-cutting hole, filling back the wells and the roadways, and finishing rectifying of the inclined building. By the aid of the method, blindness and sudden sinking effect of pile cutting off can be avoided effectively, rectifying risks are reduced, defects of poor controllability, difficulty in mastering pile cutting amount accurately and the like are overcome, controllability and security of rectifying are improved greatly, and the method can be applied in the fields of building rectifying and reinforcing.

The invention belongs to the field of nondestructive testing, and discloses a manufacturing method of a multipurpose nondestructive testing natural defect test block, which comprises the following steps: forming a groove on a base material with the thickness of more than 12mm, and carrying out backing welding by adopting argon tungsten-arc welding, wherein both the base material and a weld joint can be magnetized; filling the grooves of the base metal through shielded metal arc welding to complete weld joint filling; in the filling welding process, making an incomplete fusion defect, an incomplete penetration defect, an air hole defect, a slag inclusion defect and a tungsten inclusion defect in the weld joint; determining a designed crack area on the weld joint, coating ferrous sulfide powder on the designed crack area, and then performing shallow penetration and remelting on the weld joint in the designed crack area; polishing the remelting area of the weld joint, and polishing off unmelted ferrous sulfide; and performing cosmetic welding on the surface of the weld joint to obtain the multipurpose nondestructive testing natural defect test block. The manufacturing process is simple, the cost is low, cracks with various defects and that are close to the natural forms are formed, and the training and teaching requirements are met.

Provided is a sliding material including a substrate; and a copper alloy layer bonded to the substrate. The copper alloy includes 2.0 to 15.0% by mass of tin. The copper alloy layer includes a sliding body part including a sliding surface, and a gradient region including a bond surface with the substrate. A tin concentration in the gradient region reduces from the sliding body part toward the bond surface. A method for producing the siding material is also provided. The method includes preparing the substrate having a first surface and a second surface opposite to the first surface; melting the copper alloy; casting the molten copper alloy on the first surface of the substrate; and solidifying the copper alloy unidirectionally by cooling the substrate from the second surface by a coolant.

The invention relates to a method for testing mechanical properties of an electronic gun heater assembly, comprising the following steps: (1), taking at least two heater assemblies under detection; (2), marking an original scale distance on a heater of each heater assembly under detection, and determining original scale distances L0 and S0; (3), testing yield strength Sigma0.2 and tensile strength Sigmab of the heater assemblies under detection in an actual vacuum environment at different temperatures; (4), establishing a change-with-temperature linear relationship of the yield strength Sigma0.2 and tensile strength Sigmab of the heater assemblies under detection by linear fitting; (5), according to the linear relationship, calculating to obtain the yield strength Sigma0.2 and tensile strength Sigmab of the heater assemblies under detection at the actual operation temperatures. The method enables chemical tensile performance parameters of a heater or a combination of a heater with a platinum sheet and/or a cathode head in a vacuum high-temperature operating environment to be accurately measured, and the testing problem of engineering needs is solved.

An effective contact length in race surfaces formed on grooved races cut in an outer ring and an inner ring is made as greater as permitted to improve the load-carrying capacity, and correspondingly guide parts born against axially opposite ends of a roller are made as less as possible in width to reduce frictional contact resistance applied to the axially opposite ends of the roller, thereby preventing a skew of the roller. An inside circular surface on the outer ring is staggered or different in level on opposite sides of a outside grooved race to make greater the race surface than an effective contact length of circular rolling surfaces of the rollers and correspondingly less the guide part in width than the race surface.

The invention relates to a pipe bracket for holding a pipe on a support comprising: two feet, which are arranged spaced from each other and can each be connected to the support; a carrying element with a web, a pipe holder at the upper end of the web and a foot part at the lower end of the web, wherein the foot part is arranged in the intermediate space between the feet; and at least one compression-resistant insulating element, which is arranged between the first foot and the foot part and between the second foot and the foot part of the carrying element, wherein feet, insulating elements andfoot part are frictionally connected together by at least one fastening.

A method of pickup and pickup apparatus that lower the possibility of cracking of neighboring pellets and realize unfailing easy detaching and taking out of pellets to be detached. Multiple rectangular thin pellets (11) stuck onto pressure sensitive adhesive sheet (12) are sequentially detached from the pressure sensitive adhesive sheet (12) and taken out. While retaining each pellet (11) to be detached from above, suction from below is applied to the pressure sensitive adhesive sheet (12). Simultaneously with the air suction and pellet retention from above, while supporting the pressure sensitive adhesive sheet (12) from below by means of protrusions (25) for insertion in apertures (19), receiving part (17) is traveled in the horizontal direction to thereby realize detaching of the pellet (11).

The invention relates to a safety protection device for mine blasting, and discloses the safety protection device which forms a creeping type structure through cooperation of a protection cover plate and a bottom plate, reduces the impact bearing area of the protection device, protects workers during blasting, and can buffer and release blasting impact force. The safety protection device is characterized in that two bottom side baffles are perpendicularly arranged at the two sides of the bottom plate respectively, two supporting foot frames are arranged at one end of the bottom plate and located at the two sides of the bottom plate respectively, trundles are arranged on the supporting foot frames, one group of limiting plates are arranged at the other end of the bottom plate, each group of limiting plates are composed of at least four limiting plates, and a traction rod is arranged at the other end of the bottom plate; and a protective lying cushion is arranged at the top of the bottom plate, one end of an arc-shaped protective plate is hinged to the other end of the bottom plate through a hinge lug, a protective cover plate is obliquely arranged at the other end of the arc-shaped protective plate, an observation window is embedded in the middle of the arc-shaped protective plate, and a cover pulling handle is arranged at the bottom of the arc-shaped protective plate.

The invention discloses a high-bearing capacity and easy-pile pulling self-elevating platform pile shoe and a drilling platform. The high-bearing capacity and easy-pile pulling self-elevating platform pile shoe comprises a pile shoe main body and a bearing unit hinged to the edge of the pile shoe main body, wherein the bearing unit surrounds the pile shoe main body; the bearing unit rotates outwards under acting force of a soil body during pile insertion, so that bearing area of the pile shoe is expanded; the bearing unit rotates inwards under gravity, buoyancy and adhesive force of the soil body during pile pulling, so that bearing area of the pile shoe is decreased; and the lowest point of the bearing unit is higher than the lowest point of the pile shoe main body after pile insertion. According to the high-bearing capacity and easy-pile pulling self-elevating platform pile shoe and the drilling platform, better bearing area can be provided, platform stability is guaranteed, bearing area of the pile shoe is decreased during pile pulling, pile pulling resistance is reduced, and pile pulling is facilitated.