39results about How to "Avoid affecting smoothness" patented technology

The invention relates to a double-sided grinding device, which is used for grinding two opposite surfaces of a silicon wafer, and comprises an annular bearing structure, a grinding device and a grinding device, and is characterized in that the annular bearing structure is used for supporting the silicon wafer from the peripheral side in the radial direction; the two static pressure supporting pieces are oppositely arranged, are respectively positioned on two sides of the silicon wafer, and are used for supporting the silicon wafer in a non-contact manner through fluid static pressure; the two grinding wheels are oppositely arranged and used for grinding the two opposite faces of the silicon wafer, the two static pressure supporting pieces comprise the first static pressure supporting piece and the second static pressure supporting piece, and the first static pressure supporting piece is used for adsorbing the ground silicon wafer; and the cleaning structure is used for cleaning the first static pressure supporting piece. The invention further relates to a double-sided grinding method. Through the arrangement of the cleaning structure, the static pressure supporting piece used for adsorbing the silicon wafer is cleaned, and the smoothness of the wafer is prevented from being influenced.

The invention relates to the technical field of automobile part paint spraying, and discloses an overturning device for paint spraying of automobile parts. The overturning device comprises an operation table, fixed plates, an opening and a vertical plate. The number of the fixing plates is two, the two fixing plates are vertically arranged on the operation table and fixed to the front end and the rear end of the operation table, the fixing plates at the front end and the rear end are parallel to each other, electric push rods are installed above the surfaces of the fixing plates, the extension ends of the electric push rods penetrate to the inner sides of the fixing plates, rotary tables are installed at the tail ends of the extension ends of the electric push rods, and clamping plates are mounted on the surfaces of the rotary tables. According to the overturning device for paint spraying of the automobile parts, the opening is located in the operation table below an overturning structure, electric heating wires are arranged in the opening, a partition plate and L-shaped baffles which are used for preventing paint from being attached are arranged at the positions, above the electric heating wires, of the opening, drying work can be carried out through heat carried by airflow in the paint spraying process, and after spraying is completed, clamping and transferring of the parts are facilitated, the smoothness is prevented from being affected, and further paint baking work can be carried out when needed.

The invention discloses a tube array type heat exchange device, and aims at providing a heat exchange device with the advantages that the heat exchange between two kinds of liquid can be effectively realized, the temperature difference compensation capability is realized, and the damage due to too great temperature difference stress between a casing and a heat exchange tube can be prevented. The tube array type heat exchange device comprises a tube pass part, a casing pass part and a plurality of support frames, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes, the casing pass part comprises a heat exchanger outer casing, a casing pass inlet tube and a casing pass outlet tube, the heat exchanger outer casing consists of a sealing head, a casing head and a tube box, a fixing tube plate is arranged between the casing head and the tube box, a sealing head tube plate is arranged between the sealing head and the tube box, the inside of the casing head is separated into a tube pass flow inlet cavity and a tube pass flow outlet cavity through one tube pass flow separation plate, and an expansion joint is arranged on the tube box. The tube array type heat exchange device has the beneficial effects that the characteristic that the expansion joint part is relatively easy to deform can be used for being matched with the slidable sealing head tube plate to achieve the structural temperature difference compensation effect, and the structure damage due to too great temperature difference stress can be avoided.

The invention discloses a tube-shell type heat exchange device and aims to provide a heat exchange device which can effectively achieve heat exchange between two types of liquid, has temperature difference compensation capacity and can be prevented from being damaged due to over-large temperature difference stress between a shell and a heat exchange tube. The tube-shell type heat exchange device comprises a tube pass part, a shell pass part and a plurality of brackets, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises an outer heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the outer heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; a tube pass flow partition plate partitions the interior of the shell head into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The tube-shell type heat exchange device has the beneficial effects that according to the characteristic hat the expansion joint is relatively easy to deform, by the cooperation of the slidable sealing head tube plate, the structural temperature difference compensation effect can be achieved, and the structural damage caused by over-large temperature difference stress is avoided.

The invention discloses a chemical engineering heat exchanger and aims to provide a heat exchanger which can effectively realize heat exchange between two liquors, has capability of temperature difference compensation and can be prevented from being damaged due to excessively large temperature difference stress between a shell and heat exchange tubes. The chemical engineering heat exchanger comprises a tube pass part, a shell pass part and a plurality of brackets, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and the plurality of heat exchange tubes; the shell pass part comprises a heat exchanger shell body, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger shell body comprises a seal head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a seal head tube plate is arranged between the seal head and the tube box; a tube pass flow baffle is used for dividing the interior of the shell head into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The chemical engineering heat exchanger has the benefits that a structural temperature difference compensation effect can be achieved in combination with the slidable seal head tube plate based on a characteristic of easiness for deformation at the expansion joint, and structural damage caused by excessively large temperature difference stress is avoided.

The invention discloses a double-pass double-liquid heat exchange device and aims to provide a heat exchange device which can effectively realize heat exchange between two liquid, has the temperature difference compensation capacity and can prevent a shell and heat exchange tubes from being damaged caused by overlarge temperature difference stress between the shell and the heat exchange tubes. The double-pass double-liquid heat exchange device comprises a tube pass part, a shell pass part and a plurality of support frames, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises a heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; the inner part of the shell head is divided into a tube pass flow inlet cavity and a tube pass flow outlet cavity through a tube pass flow isolation plate; an expansion joint is arranged on the tube box. The double-pass double-liquid heat exchange device has the benefits that through the characteristic that the deformation of the expansion joint is relatively easy and in cooperation with the slideable sealing head tube plate, a structural temperature difference compensation function can be realized, and the structure damage caused by overlarge temperature difference stress is avoided.

The embodiment of the invention provides a level crossing structure of rail transit. The level crossing structure comprises a track structure body and a foundation plate, the foundation plate comprises a first part and a second part, the first part is supported below the track structure body, the second part fills an inter-line area between every two adjacent track structure bodies, and the firstpart and the second part are integrally formed. Due to the fact that the first part and the second part are integrally formed, the second part can bear automobile loads and transmit the automobile loads to the first part, and then the first part evenly transmits the loads to a roadbed foundation bed of a track structure. In this way, it is guaranteed that the roadbed foundation bed under the double-line or multi-line track structure is evenly stressed, and uneven settlement caused by uneven stress of the roadbed foundation bed under the double-line or multi-line track structure is prevented.

The invention provides a high-brightness black double-paint-layer spraying process for an automobile exterior trimming part. The high-brightness black double-paint-layer spraying process is characterized by comprising the following steps that a, pretreatment is conducted, specifically, oil stains and dust on the surface of the exterior trimming part are removed; b) flame treatment: carrying out flame treatment on the to-be-painted surface of the pre-treated exterior trimming part; c) double-paint-layer spraying: firstly, a primer is used as a first-layer paint to be sprayed on the flame-treated surface of the exterior trimming part, a second-layer paint is formed by stirring and mixing 30% by mass of colored paint, 67% by mass of varnish and 3% by mass of a-OH-containing high-molecular compound, then, a-NCO-containing curing agent is added into the second-layer paint, and the second-layer paint is sprayed on the flame-treated surface of the exterior trimming part; wherein the mass ratio of the high-molecular compound containing-OH to the curing agent containing-NCO is 100: 26, and finally, the second layer of paint is sprayed to the outer surface, where the first layer of paint is sprayed, of the exterior trimming part. The produced exterior trimming part is smooth in paint surface, free of impurities and high in percent of pass.

The invention belongs to the technical field of ceramic teeth, and relates to a high-strength and high-hardness ceramic gum abutment. The ceramic gum abutment is prepared from, by weight, 90 to 110 parts of zirconium oxide powder, 60-90 parts of titanium dioxide, 20 to 50 parts of aluminum oxide fibers, 0.2 to 1.0 part of ferric oxide, 0.1 to 2.0 parts of a dispersant, 20 to 50 parts of light-cured resin, 0.1 to 0.5 part of a photoinitiator, 0.1 to 3.0 parts of an adhesive, 0.5 to 5.0 parts of a coloring agent, 0.5 to 1.0 part of a pore-forming agent and 500 parts of a solvent; and the particle size of the zirconium oxide powder ranges from 100 nm to 500 nm, the particle size of the titanium dioxide ranges from 400 nm to 1000 nm, the diameter of the aluminum oxide fibers ranges from 50 nmto 200 nm, and the length of the aluminum oxide fibers ranges from 10 [mu]m to 200 [mu]m. According to the high-strength and high-hardness ceramic gum abutment, the surface of the ceramic gum abutmentis pure white and free of metallic luster, the surface is free of cracks in the machining process, the service life of the gum abutment is long, and safety is good.

The invention provides a gantry type stacking and lifting device based on energy-saving brick production, relates to the technical field of energy-saving brick production and processing, and solves the problems that when a traditional gantry type stacking and lifting structure is used in an energy-saving brick production place, dust-proof sealing protection consciousness is lacked, and in the long-term use process, the energy-saving brick production cost is low. The problems that dust particles generated during energy-saving brick production are extremely prone to being deposited and attached to all connecting parts, and the smoothness of stacking and lifting operation is affected are solved. The two ends of the supporting track are fixedly connected with the two supports correspondingly, and the outer side of the supporting track is connected with a movable top base. The top connecting seat is connected to the bottom of the movable top seat, and the top connecting seat is connected with the bottom connecting seat through a telescopic frame; while the telescopic frame is adjusted in a telescopic mode, the dustproof telescopic shell is adjusted in a telescopic mode synchronously, the telescopic frame is sealed and protected through the dustproof telescopic shell, and it is avoided that external dust and impurities are attached to all connecting parts of the telescopic frame, and smoothness of telescopic adjustment of the telescopic frame is affected.

The invention discloses a tube-and-shell heat exchanger and aims to provide a heat exchanger, allowing effective heat exchange between two liquids, having thermal difference compensating capacity and preventing damage caused by thermal difference stress between a shell and heat exchange tubes. The tube-and-shell heat exchanger comprises a tube side portion, a shell side portion and a plurality of supports; the tube side portion comprises a tube side incoming tube, a tube side outgoing tube and a plurality of heat exchange tubes; the shell side portion comprises a housing, a shell side incoming tube and a shell side outgoing tube; the housing is composed of a seal head, a shell head and a tube box; a fixing tube plate is disposed between the shell head and the tube box; a seal head tube plate is disposed between the seal head and the tube box; a tube side partition plate divides the inside of the shell head into a tube side inflow cavity and a tube side outflow cavity; the tube box is provided with an expansion joint. The tube-and-shell heat exchanger has the advantages that the expansion joint featuring ease of deformation and the seal head tube plate slidable fit to function in structural thermal difference compensation, and structural damage caused by excessively high thermal temperature stress is avoided.