41results about How to "Easy machining accuracy" patented technology

The invention belongs to the technical field of printed circuit boards, and concretely relates to a multichip typesetting substrate. The multichip typesetting substrate comprises a frame (2) and multiple child substrates (3), the frame (2) and each child substrate (3) as well as the child substrates (3) are connected through multiple connecting mechanisms (8), and each connecting mechanism (8) comprises at least a mechanical limiting connection mechanism (4) which is used for limiting the child substrate (3) to move in two directions perpendicular to the surface of the frame (2). The invention also discloses a manufacturing method of the multichip typesetting substrate. The multichip typesetting substrate disclosed by the invention can reliably limit the child substrates to move in two directions perpendicular to the frame (2), therefore, the connecting strength between the child substrates, or between each child substrate and the frame, is greatly improved.

The utility model provides a gas idling transition passage structure for oil and gas dual-purpose carburetor, comprising a carburetor body 1 and a mixing chamber 4; a choke valve 5 and a throttle valve 9 are disposed in the mixing chamber 4 in the order of the air flow direction; a gas intake pipe 2 for supplying gas to the mixing chamber 4 is disposed on the carburetor body 1; a first air inlet pipe 7 and a second air inlet pipe 8 are disposed in the carburetor body 1 in parallel; an opening of an outlet end of the second air inlet pipe 8 is located in the mixing chamber 4 and the position of the outlet end of the second air inlet pipe 8 is at the intersection of an outer circle and the mixing chamber 4 when the throttle valve 9 is closed.

The invention relates to a deep hole processing tool structure, which is characterized in that: a first positioning sleeve, a second positioning sleeve and a first flange cover are fastened to a processed surface at a position of a first fixing shaft of a box through screws; a first space ring, a second positioning plate and a second space ring are sequentially arranged between the second positioning sleeve and the first flange cover; a first positioning plate is arranged on the first fixing shaft between the first positioning sleeve and the second positioning sleeve in a floating mode; a second fixing shaft is parallel to the first fixing shaft and connected with a second flange cover through a screw; and a pad is arranged behind the first positioning plate and locked by a lock nut in a thread mode and fixes the axial position of the first positioning plate. The structure has the advantages of effectively providing support for a boring shaft, providing effective guarantee for links such as the processing of the box and the assembly of products, facilitating reducing the assembly difficulty, improving the processing efficiency of the products, ensuring the quality of the products,along with simple processing and assembly and reasonableness.

The invention belongs to the technical field of rotating liquid supply and relates to a rotating liquid supply device. Bearing bases are connected to the two ends of a barrel body correspondingly. A bearing is installed on each bearing base. A rotating shaft is supported on the bearings. A sealing end cover is arranged at the outer ends of each bearing base and the corresponding bearing. Two axial liquid guiding holes are formed in the rotating shaft in parallel. Each liquid guiding hole is provided with a radial liquid passing opening. Two annular grooves are formed in the barrel body in a spaced mode. Each annular groove is internally sleeved with two floating sleeves. A spring is supported between the two floating sleeves in each annular groove. A radial liquid passing hole is formed in each annular groove. Each liquid passing hole communicates with the corresponding liquid passing opening. The floating sleeves and the barrel body are circumferentially positioned. Sealing rings are arranged between the barrel body and the bearing bases as well as between the bearing bases and the sealing end covers. A liquid collecting cavity is formed in the inner side of each bearing. Each bearing base is provided with a radial liquid drainage hole communicating with the corresponding liquid collecting cavity. The rotating liquid supply device is suitable for rotating shaft liquid passing hole liquid pressure conveying.

The invention provides a floating bearing structure used for small turbochargers, and belongs to the technical field of machines. The problems of low efficiency, easy self-excited vibration, low durability and low stability of present bearing structures used for turbochargers. The floating bearing structure used for small turbochargers comprises a single semi-floating bearing sleeve, the single semi-floating bearing sleeve is provided with a plurality of oil holes I, a static oil clearance exists between the single semi-floating bearing sleeve and a bearing body, the single semi-floating bearing sleeve is provided with an oil return hole, a turbine rotating shaft is sheathed with a full-floating bearing sleeve, the full-floating bearing sleeve and the single semi-floating bearing sleeve are axially positioned, the full-floating bearing sleeve is provided with a plurality of oil holes II, a dynamic oil clearance I exists between the full-floating bearing sleeve and the single semi-floating bearing sleeve, and a dynamic oil clearance II exists between the full-floating bearing sleeve and the turbine rotating shaft. The floating bearing structure has the advantages of reasonable structure, high reliability, high efficiency and the like.

The invention relates to the technical field of metal material processing equipment, in particular to a multi-directional repeated extrusion deformation processing device and a processing method for magnesium alloy profiles. The processing device includes a punch, an upper die and a lower die, the upper die is provided with a die cavity, the die cavity is composed of a punch channel and an extrusion channel, and the punch channel is in the shape of a cuboid, The extrusion channel is in the shape of an inverted regular quadrangular prism, the upper and lower concave die are connected and positioned by screws and pins to form a concave die, and the punch is arranged in the punch channel and is connected with the convex die. match the mold channel. The processing device of the invention has a simple structure and convenient operation, which is beneficial to the demoulding of extruded samples, can prepare a large number of high-performance magnesium alloy products of various sizes, and improves the production efficiency and processing accuracy. In the case of press production, the wear of the punch is small, and the magnesium alloy processed by this device has good strength, plasticity and corrosion resistance.