31results about How to "Avoid problems such as cracks" patented technology

The invention belongs to the technical field of gypsum building materials, and relates to a light-weight laminboard, which is manufactured by compositing a surface course material mainly prepared from ground and calcined fluorgypsum on a polystyrene plastic foam board core material, and of which both sides are provided with grooves. In the laminboard, the surface course material coated outside a polystyrene plastic foam board is prepared from the following raw materials in part by weight: 100 parts of fluorgypsum powder, 2 to 6 parts of sulphoaluminate cement, 1 to 3 parts of sodium sulfate and 0.5 to 1.5 parts of glass fibers, wherein the ratio of water to the raw materials is 0.50-1.0. The product performance reaches national quality standards; and the fluorgypsum light-weight laminboard has the functions of light weight, high strength, heat preservation, heat insulation, sound insulation and the like, and is a walling material which can be applied to buildings with frame structures.

Provided is an NTC thermistor having excellent linearity of resistance temperature characteristics by using only one kind of semiconductor ceramic material without depending on combination of two or more kinds of materials. As a semiconductor ceramic material, which constitutes a ceramic element (20) for an NTC thermistor (1) and has a negative resistance temperature characteristic, a material composed of an oxide expressed as (La1-alphaBaalpha)xMnyOz (where, z is a number determined by values of x and y and satisfies the electroneutrality conditions as ceramic). When x=1 and y=0.8 to 1.5, an inequality of 0.60<=alpha<=0.75 is satisfied, and when x=1 and y=1.7 to 2.3, an inequality of 0.50<=alpha<=0.63 is satisfied.

The invention discloses an internally-tangent type highly-efficient cutting device for a glass tube. The internally-tangent type highly-efficient cutting device has a structure which comprises a device body, a liftable glass placement platform, glass tube clamp assemblies, a glass tube and a cutting unit, wherein the liftable glass placement platform is arranged on the device body; and a glass tube clamp assembly mechanically connected with the machine body is respectively arranged at two sides of the liftable glass placement platform. Compared with the prior art, the internally-tangent type highly-efficient cutting device provided by the invention has the following beneficial effects: a disc extends into the glass tube, and three cutting wheels synchronously extend outwards and rotate, sothe device can adapt to glass tubes with different calibers; the cutting wheels move from the inner wall of the glass tube to the outer wall of the glass tube for cutting the glass tube, so the device can prevent pressure on the glass tube from generation due to cutting from outside to inside, avoids problems like cracking of the glass tube, can guarantee the quality of the glass tube, can avoidpowder scraps from splashing outwards, and can collect the powder scraps generated in the cutting process and prevent the powder scraps from splashing on the basis of a triboelectrification principle.

The invention belongs to the technical field of novel building materials and relates to a light sandwich panel which uses slags as main surface materials and is manufactured by compounding on a polystyrene foam plastic panel core material, wherein, the sandwich panel is provided with ladder-shaped, triangular or semi-circular grooves at both sides. The surface materials coated on the exterior of the polystyrene foam plastic panel in the invention are manufactured by the following raw materials in parts by weight: 100 parts of slag powder, 2-7 parts of sulphate aluminium cement, 1.5-5.5 parts of desulfurized building gypsum, 0.5-5 parts of mirabilite and 4-11 parts of quicklime; the mass ratio of the water to the raw materials is 0.45 to 0.70. The product of the invention has the performance up to the national quality standard, is light in weight and high in strength, has the functions of thermal insulation, sound insulation and the like, and is a wall material that can be applied to frame-structured buildings.

The invention discloses a fiber grating inclination sensor made of all glass, which comprises a glass cover, a glass cylinder, a glass block, a cross glass rod, an equal-strength tempered glass beam, a first fiber grating, and a second fiber grating; the glass cylinder The inner wall of the upper part is provided with an internal thread, which is connected with the external thread of the cylindrical surface of the glass cover to form a closed space; the equal-strength tempered glass beam is fixed on the glass cover, and the cross glass rod is fixed on an equal-strength tempered glass rod. Below the glass beam, the glass block is fixed on the lower end of the cross glass rod; the first fiber grating and the second fiber grating are fixed on the surface of the equal-strength tempered glass beam, and the tails of the first fiber grating and the second fiber grating The optical fiber at the end is led out from the optical fiber access hole of the glass cover. The invention solves the problems of low sensitivity, complex structure and long measurement time of the existing inclination sensor, prolongs the service life of the sensor and has wide application range.

The invention discloses a formation method for a machine case of a combustor. The formation method comprises the following steps: S1, initially drawing blanks to achieve initial formation of the blanks so as to carry out drawing and deformation in follow-up steps; S11, removing stress of the initially drawn blanks; and S2, secondarily drawing the blanks, and forming. According to the formation method, a two-grade drawing technology is adopted to reduce the difficulty at the technology for drawing at each time, and relatively lower drawing force is required for drawing each time, so that the requirements on processing equipment are reduced. With the adoption of the formation method, the circumstances of relatively high variation of the strength and hardness of metal materials can be effectively avoided, so relatively lower formation pressure is generated during forming the blanks by the formation method; and meanwhile, the operation of frequently annealing in the process can be saved, thereby reducing the complexity of a manufacture technology for the machine case of the combustor.

The invention discloses an internal cutting type cutting device for glass tubes. Its structure includes a machine body, a liftable glass placement platform, a glass tube clamp assembly, a glass tube, and a cutting device. Both sides of the placing table are provided with glass tube clamp assemblies mechanically connected to the machine body. Compared with the prior art, the invention has the beneficial effect of: the disc is inserted into the glass tube, and three cutting wheels are used to protrude and rotate synchronously. , can be adapted to glass tubes of different calibers. The cutting wheel moves from the inner wall of the glass tube to the outer wall of the glass tube to cut the glass tube, which can prevent the pressure from being cut from the outside to the inside of the glass tube, and avoid cracks in the glass tube, etc. The problem is that the quality of the glass tube can be guaranteed, and the powder chips can be prevented from splashing outward. Based on the principle of frictional electrification, the powder chips generated during cutting can be collected to prevent the powder chips from splashing.

The invention discloses an energy-saving heat-preservation wall body of an assembled building and an installation and assembly device thereof, and relates to the construction field. The wall designed by the present invention includes a supporting frame, and a heat-insulating wall is arranged in the supporting frame, and a cover plate is arranged on the upper end of the heat-insulating wall, which can well protect the inner wall, and at the same time, the firmness between layers is guaranteed, improving The thermal insulation effect and load-bearing effect of the wall are improved; at the same time, after the overall installation and assembly device designed by the present invention is fixed to the wall, the outer baffle plate and the second receiving plate are respectively attached to the outer wall of the forming frame and the upper end of the cover plate, To achieve the purpose of limiting the two sides of the wall, after fixing the two sides of the wall, the whole wall is in a horizontal state, and the first receiving plate and the second receiving plate are attached to the upper end of the cover plate respectively, so that the cover plate and the resistant When the alkali protective layer is bonded and formed by an adhesive, the whole is parallel and has a higher flatness, which improves the quality of the wall and avoids problems such as cracks during installation.

The invention provides an airplane radial tire shoulder wedge with low heat generation and high elasticity properties. The airplane radial tire shoulder wedge is prepared from raw materials in parts by weight as follows: natural rubber, a reinforcing system, a silane coupling agent, an anti-ageing agent, a stabilizer and the like through banburying by a banbury mixer and extruding by an extruder, and is attached to the tire shoulder part. The airplane radial tire shoulder wedge has the advantages that the airplane radial tire shoulder wedge has low heat generation, high elasticity, good flexing resistance and good heat stability, the hardness and stress at definite elongation are reasonably matched with peripheral parts, and delamination caused by the fact that the tire shoulder wedge and the peripheral parts produce different deformation in a stress state can be prevented.

The invention provides a blade tip of a wind generating set and a preparation method thereof. The preparation method comprises the following steps that an insulating layer is wrapped around the outerperipheral surface of a designated part of a metal blade tip body; the designated part of the first surface of the metal blade tip body is placed right opposite to a non-metal first surface shell of ablade; and vacuum perfusion is carried out on the metal blade tip body and the first surface shell which are placed opposite to each other so as obtain the metal blade tip body and the first surfaceshell which are combined into a whole. According to the blade tip of the wind generating set and the preparation method thereof, the metal blade tip body and the first surface shell (such as a leewardsurface shell) of the blade are fixedly combined into a whole through a vacuum perfusion method, so that the problem that a metal blade tip body and a blade are staggered can be solved, the quality of the blade tip is improved, and then the performance of the lightning-protection metal blade tip is ensured.