42results about How to "Improves pressure uniformity" patented technology

The invention belongs to the technical field of printed circuit boards and discloses a semi-flexible circuit board and a preparation method thereof. The preparation method includes manufacturing of a rigid auxiliary board, manufacturing of a semi-flexible core board, laminating of a main board, manufacturing of an outer layer of the main board and a windowing procedure. Manufacturing of the rigid auxiliary board includes: (1) manufacturing an inner-layer circuit of a rigid core board; (2) adopting a flowing type prepreg for laminating the rigid core board to make the rigid auxiliary board, and pressing the prepreg and temporary copper foils onto a surface, adjacent to the semi-flexible core board, of the inner-layer circuit; (3) removing the temporary copper foils by etching; (4) milling grooves. In the procedure of laminating of the main board, the rigid auxiliary board and the semi-flexible core board are laminated by the aid of a non-flow type prepreg. Therefore, a dielectric layer between the rigid auxiliary board and the semi-flexible core board is made by means of twice lamination, interlayer binding force between the rigid auxiliary board and the semi-flexible core board is guaranteed while glue overflowing in a semi-flexible area is reduced, and the problem of proneness to glue overflowing in the prior art is solved.

A paper machine belt that includes a cross-machine direction supporting layer providing strength in the cross-machine direction and at least two additional layers. The two additional layers include polymeric material and at least one of the additional layers that includes the polymeric material is positioned on one side of the cross-machine direction supporting layer and at least another of the additional layers that includes the polymeric material is positioned on an opposite side of the cross-machine direction supporting layer. The cross-machine direction supporting layer substantially includes cross-machine direction yarns loosely bound together with very fine machine-direction yarns. A ratio of mass of the cross-machine direction yarns to the machine direction yarns being at least 160:1, and mass of the polymeric material of the additional layer on the one side of the cross-machine direction supporting layer is substantially the same as a mass of the polymeric material of the additional layer that is provided on the opposite side of the cross-machine direction supporting layer.

The invention belongs to the technical field of composite aviation manufacturing and relates to a forming tool for a winglet of a foam sandwich composite structure. The forming tool is composed of an upper forming mold and a lower forming mold. The upper forming mold is a composite mold and is used for ensuring the outline dimension and the surface quality of the upper molded surface of the winglet in the winglet forming process. The lower forming mold is a composite frame mold and is used for supporting and fixing a whole part and ensuring the outline dimension and the surface quality of the lower molded surface of the winglet in the winglet forming process. The molded surface of the lower forming mold is a variable-thickness composite molded surface. The butt joint area of the front edge of the lower forming mold and the upper forming mold is provided with a thinning area to ensure the uniformity of a pressure field in the large-curvature area of the front edge of the winglet. The forming tool for the winglet of the foam sandwich composite structure is easy to operate, demolding is easy, the problem that large-curvature complex structure parts similar to the winglet are unevenly pressurized is solved, and the internal quality and the surface quality of the parts are well ensured.

The invention discloses a machining method by air bag pressurization when plastic tile faces are adhered to adhered plastic radial tiles. When a metal tile substrate is adhered to and composited with a pure polytetrafluoroethylene plate or a modified polytetrafluoroethylene board by an adhesive, an air bag is put in the center of a cylindrical bore of the tile and is inflated to make the air bag expand for pressurization. The method has the advantages of uniform pressurization stress, low cost, simpleness and feasibility, and conveniently solves the problem of pressurization when large- and overlarge-diameter tile faces are adhered.

The invention relates to an indirect heating-type synthesis assembly for single crystal synthesis by using a cubic press. The indirect heating-type synthesis assembly comprises pyrophyllite powder pressing block which is internally lined with a dolomite casing. The indirect heating-type synthesis assembly is characterized in that a cylindrical metal cup made of metal niobium, tantalum, molybdenum or tungsten is arranged in the dolomite casing, an aluminum oxide ceramic high-temperature pipe is wrapped outside the cylindrical metal cup and the aluminum oxide ceramic high-temperature pipe is made of alpha-aluminum oxide and talc through high-temperature sintering; metal conducting strips are respectively arranged on the two sides of the metal cup and are connected with the metal cup; and the two ends of the dolomite casing are respectively sealed by composite conducting plugs and the composite conducting plugs are connected with the metal conducting strips. The indirect heating-type synthesis assembly uses high-melting-point metals to make the metal cup which is also used as an electric heating element, aluminum oxide ceramic materials are additionally used for making the high-temperature protection pipe, the indirect heating-type synthesis assembly is suitable for synthesizing artificial single crystals such as diamonds by using the cubic press, the requirements of higher temperature and longer heating time are satisfied, the stability of single crystal synthesis technology and equipment is improved, the losses of anvils are reduced and favorable conditions are provided for the synthesis of gem grade diamonds.

The light guide plate manufacturing method comprises the following steps of: using a rolling depression device comprising an imprinter, wherein the surface of the imprinter comprises a first structure; rolling a resin layer arranged on a substrate by the imprinter, or forming the resin layer on the imprinter to roll the substrate, enabling the resin layer to continuously form a second structure complementary to the first structure, and attaching the second structure on the substrate. The rolling depression area formed by the rolling depression mode is smaller, so the uniformity of pressure application is easy to control, the light guide plate can have high transcription rate, and defects are reduced.

The invention discloses a radio frequency switch circuit for optimizing voltage withstanding uniformity of stacked switch tubes, and relates to the technical field of radio frequency integrated circuits. The circuit comprises a series branch module composed of 2N first switch transistors, a first bias transistor, a first source drain resistor, a first grid bias resistor, 2N-1 first grid series resistors and a first grid common end resistor; a parallel branch module composed of 2M second switch transistors, a second bias transistor, a second source drain resistor, a second grid bias resistor, 2M-1 second grid series resistors and a second grid common end resistor; according to the structure, the maximum peak voltage borne by the switch transistors of the previous stages and the later stages of the radio frequency switch can be reduced, the withstand voltage uniformity of each stage of switch transistor of the radio frequency switch and the maximum input power of the radio frequency switch are improved, and particularly, the withstand voltage uniformity of each stage of switch transistor of a parallel branch module is improved.

The invention belongs to the technical field of hot-pressing buffer materials, and particularly relates to a silica gel glass fiber cloth hot-pressing buffer material and a preparation method thereof.The silica gel glass fiber cloth hot-pressing buffer material comprises a liquid silica gel layer, a heat conduction silica gel layer and glass fiber cloth with the two faces coated with silane coupling agents, the heat-conductive silica gel layer is calendered and compounded on the other surface; the liquid silica gel layer is a mixture of liquid silica gel, a heat-resisting agent and heat conduction powder; the heat-conductive silica gel layer is obtained by filling solid silica gel with heat-conductive powder; the buffer material prepared by the invention is a unique synthetic elastomer prepared from a silica gel polymer and high-strength glass fibers, perfectly combines the thermal performance and elasticity of silica gel molecules and the unique toughness of a fiber material, and has extremely high tear resistance and very high compression resistance and resilience; The excellent insulativity, high-speed heat transfer performance and high-temperature resistance of the cable can be embedded in extremely harsh application occasions.

A system for cooling a combustion chamber of an engine, such as a rocket engine, is provided. The system has a plurality of coolant tubes or passages surrounding the combustion chamber, a torroidal coolant-collection manifold for receiving coolant from the coolant tubes or passages and for discharging the coolant through a discharge port, and a plurality of turning vanes within the torroidal manifold for reducing pressure loss and improving pressure uniformity associated with the torroidal coolant-collection manifold.

The invention discloses an expansion tank for a water supply system of a plate type heat exchanger unit. The expansion tank comprises a tank body, wherein a water inlet pipe is fixedly mounted at thetop of the tank body, a first electromagnetic valve is fixed to the end, away from the tank body, of the water inlet pipe, a first skin bag chamber is formed in the position, located below the water inlet pipe, in the tank body, a plurality of water delivery skin bag pipes are uniformly arranged at the bottom of the first skin bag chamber, a second skin bag chamber is fixed to the ends, away fromthe first skin bag chamber, of the water delivery skin bag pipes, and is located in the tank body, a drain pipe is fixed to the bottom of the second skin bag chamber, and a second electromagnetic valve is fixed to the end, away from the tank body, of the drain pipe. By means of the first skin bag chamber and the second skin bag chamber, the contact area of gas and water can be increased, water canbe subjected to relatively uniform pressure bearing during draining, so that pressing uniformity of water in the first skin bag chamber and the second skin bag chamber is increased, and the drainingeffect of the expansion tank is improved.

The invention discloses a polishing head structure of a polishing machine. The polishing head structure comprises a support, a vertical motor, a driving gear, a driven gear and an air cylinder assembly, wherein the vertical motor is fixed to the support; the driving gear is located in the support and fixedly connected with the output end of the vertical motor; the driven gear is fixedly connectedto an upper disc shaft assembly and is in engaged transmission with the driving gear; a cylinder rod of the air cylinder assembly is connected with a transition shaft sleeve assembly; an anti-rotationsleeve is arranged at the upper end of the transition shaft sleeve assembly; a rotary connector assembly is arranged in the anti-rotation sleeve and connected with the upper disc shaft assembly; theupper disc shaft assembly is rotationally arranged in the support; the lower end of the upper disc shaft assembly is connected with an upper disc assembly; the upper disc assembly is located below thesupport; and an organ cover is arranged between the support and the upper disc assembly and connected to the upper disc shaft assembly. According to the polishing head structure, a balancing weight adjusting and pressurizing manner is adopted for replacing a traditional air cylinder pressurizing manner, pressurizing is more stable, and the pressurizing uniformity of a polishing head is better through a center auxiliary air cylinder pressurizing manner.

The invention provides a material cleaning device and a cooking utensil. The material cleaning device comprises a cleaning cavity which is provided with a sliding assembly part and a material discharging port, an absorbing component which is arranged on the cleaning cavity and a movable plate which is provided with a sliding part, wherein the sliding part can be slidably connected with the slidingassembly part, the material discharging port is blocked by the movable plate when the movable plate slides to a sealing position, and the movable plate is matched with the absorbing component at thesealing position in a magnetic attraction mode, so that the material discharging port is sealed by the movable plate, the material discharging port is avoided by the movable plate when the movable plate slides to a material discharging position, and therefore the material discharging port is opened to allow discharging of materials in the cleaning cavity. According to the material cleaning device,tightly sealing and covering of the material discharging port can be achieved under the premise that a powering device is not relied on, and accuracy of moving of the movable plate in a long-term useof a product can be ensured to avoid the occurrence of the problem that the material discharging port cannot be tightly sealed and covered by the movable plate.

The invention discloses a flat plate type thermoplastic PEKK carbon fiber one-way belt laminated plate and a processing method thereof. Comprising the following contents: (1) the laying mode of the flat plate type thermoplastic PEKK carbon fiber one-way belt laminated plate, (2) the processing technological parameters of the flat plate type thermoplastic PEKK carbon fiber one-way belt laminated plate, (3) the processing method of the flat plate type thermoplastic PEKK carbon fiber one-way belt laminated plate, (4) the mold surface structure design of the flat plate type thermoplastic PEKK carbon fiber one-way belt laminated plate, and (5) the mold surface structure design of the flat plate type thermoplastic PEKK carbon fiber one-way belt laminated plate. The paving mode of the flat plate type thermoplastic PEKK carbon fiber one-way belt laminated plate in the step 1 is as follows: the thickness of a thermoplastic PEKK carbon fiber one-way belt is 0.1-0.2 mm. And the laying direction of the 20 layers of materials is [45/-45/0/0/90/0/0/45/-45/0] S. All layers of thermoplastic PEKK carbon fiber one-way belts are prevented from sliding during compression molding in a spot welding mode or a mode that the peripheries of the thermoplastic PEKK carbon fiber one-way belts are fixed through high-temperature adhesive tapes, the effect on the angle between fibers is avoided, and it is guaranteed that a hole sealing agent and a release agent can be better and effectively attached to the surface of a mold through control over the construction temperature of the hole sealing agent and the release agent; and the effects of hole sealing and demolding are achieved.

The invention relates to the technical field of water valves, and discloses a flush valve for a public washroom. A pull rod is fixedly connected to the outer side of a gear shaft, a rack in engaged transmission with the gear shaft is movably connected with a sleeve hole in a sleeved manner, a notch is formed in the middle of the rack, an end of a driving shaft is of a ratchet wheel structure and movably connected with a one-way gear in a sleeved manner, power gears are fixedly connected to two ends of a valve element, axial sliding grooves are uniformly formed in the outer ring of the valve element, radial sliding grooves are formed in the positions, located at two ends of the axial sliding grooves, of the valve element, sliding plates are symmetrically and movably connected to two ends of the axial sliding grooves in a sleeved mode, a baffle is movably connected to the top of a hydraulic cavity in a sleeved mode, a rotating wheel in engaged transmission with the power gears is movably arranged in a transmission cavity, and top blocks are uniformly arranged at the outer ring of the front surface of the rotating wheel at intervals. Through the arrangement of the valve element structure, the cooperation with the transmission part, the baffle and other structures, and the arrangement of the rack with the notch, the overall service lifetime of a valve body is prolonged, and water is saved.

An apparatus (10) applies pressure against a platen (16) using a linked series of contact members arranged in a closed loop. A drive apparatus rotates the loop about a support mechanism, thereby imparting movement to the linked series of contact members. The support mechanism is disposed to force a plurality of the moving contact members simultaneously into compressive contact against the platen (16).

The invention discloses a bolt fastening device and an assembly system. The bolt fastening device comprises a stand column; a first anti-torque arm rotatably connected to the stand column; a first angle encoder used for collecting first rotation angle information of the first anti-torque arm; a second anti-torque arm rotatably connected to the end, away from the stand column, of the first anti-torque arm; a second angle encoder used for collecting second rotation angle information of the second anti-torque arm; a torque wrench arranged on the second anti-torque arm; and a central guide controller which can receive and store the preset fastening sequence and the preset fastening position in advance. By means of the bolt fastening device of the invention, the actual fastening position can be consistent with the preset fastening position, the actual fastening sequence is consistent with the preset fastening sequence, the error rate of the bolt fastening sequence and the bolt fastening position is reduced, the pressure uniformity between parts is improved, the rigidity of a bolt connection assembly is enhanced, and the service life of the bolt connection assembly is prolonged.