Abstract: Rubber diaphragm, sound device and application thereof are provided, rubber diaphragm contains distortion improving agent with mass percentage of 0.2-60%; distortion improving agent is block polymer, and end group or block component of distortion improving agent includes special chemical crosslinking point with mass fraction of 0.02-25%; number average molecular weight of block of distortion improving agent is 300-100000; and distortion improving agent or main structure thereof is accurately prepared through living polymerization. Rubber diaphragm contains distortion improving agent, and structure and content of special chemical crosslinking point are accurately controllable, so that position, height and width of damping peak of rubber diaphragm are accurately controllable, and damping characteristics of rubber diaphragm are accurately controllable.

Abstract: Rubber diaphragm, sound device and application thereof are provided; rubber diaphragm includes distortion improving agent with mass percentage of 0.5-50%; distortion improving agent is random linear polymer with more than two monomer components randomly arranged on main chain, and distortion performance is synergistically regulated by monomer components; end group and/or side group and side chain of distortion improving agent includes special chemical reaction crosslinking points with mass percentage of 0.01-20, and number average molecular weight of distortion improving agent is 500-1200000; and distortion improving agent or main chain thereof is prepared by one-step method. Rubber diaphragm includes distortion improving agent, which is random linear polymer that components are randomly arranged on main chain.

Abstract: A rubber voice diaphragm including distortion improving agent with mass percentage of 0.3% to 60%. The distortion improving agent is macromolecule polymer with hyperbranched structure, and has specific chemical crosslinking points with mass percentage of 0.01% to 15%. Branches of the macromolecule polymer with hyperbranched structure are long or short chain structures prepared by active polymerization. Each distortion improving agent molecule includes at least three long or short chain structures, and number-average molecular weight of the long chain structure or the short chain structure is 200 to 50000. The specific chemical crosslinking points are distributed at the outermost end of the hyperbranched structure, and the adjacent specific chemical crosslinking points are separated by at least six carbon atoms.

Abstract: A rubber voice diaphragm including a distortion improving agent with a mass percentage of 1% to 40%. The distortion improving agent is macromolecule polymer with a —Si—O— structure in a main chain, and includes side group and/or side chain. A number-average molecular weight of the side chain of the distortion improving agent is 60 to 20000. An end group and the side group of the distortion improving agent each include at least one of methyl group, ethyl group, propyl group, butyl group, phenyl group, naphthyl group, hydroxyl group, amino group, ester group, and amide group. At least one of the end group, the side group, and the side chain of the distortion improving agent has specific chemical crosslinking points with mass percentage of 0.03% to 30%. The distortion improving agent can significantly improve distortion performance and demolding performance of the rubber voice diaphragm without sacrificing physical performance advantages.

Abstract: An air fryer drawer includes a panel, a fryer basket fixed to the rear side of the panel to receive food to be fried, and a handle disposed at the front side of the panel, the panel being provided with a transparent area through which a user can observe the conditions of the food being fried in the fryer basket. The handle includes a grip handle segment, and is capable of rotating between a first state and a second state relative to the panel, the grip handle segment being located at the front side of the transparent area when the handle is in the first state to facilitate manipulation of the grip handle segment, and the grip handle segment being deviated from the transparent area when the handle is in the second state to facilitate observation of the conditions of the food being fried in the fryer basket.

Abstract: A composite diaphragm, including an adhesive layer and at least two rubber layers stacked and bound through the adhesive layer. The rubber layer is prepared by crosslinking of a rubber material and a vulcanizing agent, and includes, by weight, 100 parts of ethylene-acrylate rubber, 0-100 parts of nano filler, 1-8 parts of the vulcanizing agent, 0.2-6 parts of an anti-aging agent and 1-10 parts of an internal releasing agent. A sound-generating device including the diaphragm is provided. Through the multi-layer composite structure, the loss factor peak of the composite diaphragm in the dynamic mechanical analysis is widened, and the loss factor is maintained at a higher level within a range from ?10° C. to high temperature, greatly improving the damping property. The use of the composite diaphragm in sound-generating devices can effectively improve the acoustic performance and reduce the total harmonic distortion, enabling better acoustic restoration effects.

Abstract: A rubber voice diaphragm is composed of main rubber, distortion improving agent, vulcanizing agent, accelerant, reinforcing filler, and other processing aids. The distortion improving agent is a substance with number-average molecular weight ranging from 1000 to 1000000, and structure of distortion improving agent has special chemical crosslinking points that participate in rubber vulcanization reaction. The special chemical crosslinking points are present in amount of 0.01% to 30% based on mass of distortion improving agent. The distortion improving agent is added in amount of 0.1% to 100% based on mass of main rubber. Frequency bands for improving distortion of distortion improving agent range from 0.1 HZ to 20000 Hz. In the rubber voice diaphragm provided in the present disclosure, a special distortion improving agent is selected, which solves the problems of molecular migration, poor reliability, a high modulus change rate, and poor rubber mechanical properties existing in traditional modified method.

Abstract: A reel mechanism and a winding device for a flexible copper clad laminate includes a rotating roller, a winding belt wound on the rotating roller for winding the flexible copper clad laminate, first and second limit structures arranged one side of the winding belt away from the rotating roller. A space between the first limit structures and the second limit structures accommodates the flexible copper clad laminate. When the winding belt is wound with multiple layers outside the rotating roller, adjacent layers of the winding belt are spaced apart by the first and second limit structures. Since a protruding height of the first limit structures is equal to a protruding height of the second limit structures, and intervals between adjacent layers of a composite coil formed by the winding belt and the flexible copper clad laminate are equal, which avoids adhesion and copper foil surface oxidation.

Abstract: The present invention provides a resin composition, a polyimide preparation method and related products. The resin composition consists of the following components: polyimide which is a soluble product generated by a reaction of monomer groups containing aromatic tetracarboxylic dianhydride and diacid dihydrazide, a main chain of the polyimide containing a hydrazide structure; and a curing agent which comprises one or more of multifunctional epoxy resin, a primary amine compound with three or more functional groups, and polyisocyanate, wherein a mass ratio of the curing agent to the soluble polyimide is 0-20%. The resin composition in the present invention utilizes the hydrazide structure in the polyimide to prepare an adhesive with excellent heat resistance, adhesive performance, and solubility, overcoming the shortcomings of existing polyimide-based adhesives during processing or application.

Abstract: An air cooking device includes a main unit and a drawer structure, wherein the main unit is provided with an internal cavity, and the drawer structure includes a drawer panel and a frying bucket fixed on the back side of the drawer panel. The drawer structure can be pushed into the cavity to perform the operation of air frying cooking. The main unit includes a top wall above the cavity, and the air cooking device also includes a sealing element, with the sealing element being provided between a mouth portion of the frying bucket and the top wall of the cavity to prevent oil fumes in the frying bucket from escaping between an edge of the mouth portion of the frying bucket and the top wall of the cavity.

Abstract: This application provides a benzoxazine resin and a preparation method thereof, and an adhesive. The benzoxazine resin is represented by the following formula: where R1, R2, R3 and R4 are each independently selected from the group consisting of —H, alkyl, alkoxy, cycloalkyl, and aryl, and at least one of R1, R2, R3 and R4 is —H; X1 is an alkyl or/and alkoxy containing a long chain structure in main chain or side chain; X2 is one or more selected from alkyl, ether group, alkoxy, alkyl ester group, carbonyl, sulfone group, and thioether group; and n is 1-150.

Abstract: This application provides a resin composition and an adhesive. The resin composition is composed of benzoxazine and a resin. The benzoxazine is synthesized from a primary amine-capped flexible polyimide oligomer, an aldehyde and a monofunctional phenolic compound. The resin contains one or more of an epoxy resin, a maleimide resin, and a cyanate ester resin containing two or more functional groups. The resin is 0.1%-70% by weight of the benzoxazine.

Abstract: An air cooking device includes a main unit and a drawer structure, wherein the main unit is provided with an internal cavity, and the drawer structure includes a drawer panel and a frying bucket fixed on the back side of the drawer panel. The drawer structure can be pushed into the cavity to perform the operation of air frying cooking. The main unit includes a top wall above the cavity, and the air cooking device also includes a sealing element, with the sealing element being provided between a mouth portion of the frying bucket and the top wall of the cavity to prevent oil fumes in the frying bucket from escaping between an edge of the mouth portion of the frying bucket and the top wall of the cavity.

Abstract: A coffee maker comprises a body and a brewing device, the body comprises an abutting portion, and the brewing device comprises a receiving apparatus and a top lid movably assembled on the receiving apparatus. The receiving apparatus is provided with a receiving chamber. The top lid is located above the receiving chamber. The brewing device is movable so that the top lid can be switched between a closed state and an opened state. When the brewing device is moved to a position near the body, the abutting portion abuts the top lid so that the top lid is switched to the closed state. When the brewing device is moved forward to a position away from the body, the top lid is disengaged from the abutting portion and the top lid is automatically switched to the opened state without having to be manually raised, thus enabling convenient operation.

Abstract: A reel mechanism and a winding device for a flexible copper clad laminate includes a rotating roller, a winding belt wound on the rotating roller for winding the flexible copper clad laminate, first and second limit structures arranged one side of the winding belt away from the rotating roller. A space between the first limit structures and the second limit structures accommodates the flexible copper clad laminate. When the winding belt is wound with multiple layers outside the rotating roller, adjacent layers of the winding belt are spaced apart by the first and second limit structures. Since a protruding height of the first limit structures is equal to a protruding height of the second limit structures, and intervals between adjacent layers of a composite coil formed by the winding belt and the flexible copper clad laminate are equal, which avoids adhesion and copper foil surface oxidation.

Abstract: An air fryer drawer includes a panel, a fryer basket fixed to the rear side of the panel to receive food to be fried, and a handle disposed at the front side of the panel, the panel being provided with a transparent area through which a user can observe the conditions of the food being fried in the fryer basket. The handle includes a grip handle segment, and is capable of rotating between a first state and a second state relative to the panel, the grip handle segment being located at the front side of the transparent area when the handle is in the first state to facilitate manipulation of the grip handle segment, and the grip handle segment being deviated from the transparent area when the handle is in the second state to facilitate observation of the conditions of the food being fried in the fryer basket.

Abstract: A large-angle sloping roof steel structure connected to a main body structure, including: an intermediate platform, inclined main supporting steel columns circumferentially connected at four corners of the intermediate platform, constructing steel columns and wind-proof surrounding beam connected between top ends of the inclined main supporting steel columns, where roof purlin are connected between the adjacent inclined main supporting steel columns at intervals. The invention provides a top-down inverted construction method for a large-angle sloping roof with a steel structure as the main structural form. By using the method, the operation safety of an inclined main stressed vertical member during the installation process can be ensured, and the investment of supporting measures is reduced by preferentially installing the intermediate platform, thus effectively ensuring the installation progress, quality and safety of the sloping roof steel structure.

Abstract: An air cooking device includes a main unit and a drawer structure, wherein the main unit is provided with an internal cavity, and the drawer structure includes a drawer panel and a frying bucket fixed on the back side of the drawer panel. The drawer structure can be pushed into the cavity to perform the operation of air frying cooking. The main unit includes a top wall above the cavity, and the air cooking device also includes a sealing element, with the sealing element being provided between a mouth portion of the frying bucket and the top wall of the cavity to prevent oil fumes in the frying bucket from escaping between an edge of the mouth portion of the frying bucket and the top wall of the cavity.

Abstract: An air cooking device is equipped with a cooking cavity and includes a heating device and a fan above the cooking cavity. The fan is used to suck up the wind in the cooking cavity and blow it toward the heating device, and the hot air blows to the cooking cavity to cook food. The air cooking device includes a protective cover under the fan. The protective cover includes an air inlet, an air outlet, and a shielding portion between the air inlet and the air outlet. The shielding portion is located under the heating device to prevent the heating device from directly heating the ingredients in the cooking cavity, and to prevent the surface of food from becoming burnt.

Abstract: An air cooking device is equipped with a cooking cavity and includes a heating device located above the cooking cavity, a temperature measuring device, and a fan, wherein the fan is used to suck up the wind in the cooking cavity and blow it towards the heating device, and the hot air blows to the cooking cavity to cook food. The temperature measuring device is used to detect the temperature in the cooking cavity. The air cooking device also includes a shielding cover between the heating device and the temperature measuring device, where the shielding cover shields the heating device from radiating to and heating the temperature measuring device, so as to improve the accuracy of the temperature measurement of the temperature measuring device.