139results about How to "Prevent pull-off" patented technology

The invention discloses a continuous casting blank section casting cold material placing structure and a placing method thereof. The placing structure comprises a crystallizer, a dummy bar head arranged in the crystallizer, and the following parts arranged in sequence in the vertical direction from bottom to top: asbestos cloth, multiple steel wire shots and casting bricks; multiple asbestos ropes are filled in a gap between the crystallizer and the dummy bar head; the asbestos cloth respectively covers the upper surface of the dummy bar head and the multiple asbestos ropes; the casting bricks are coated with cold material frames; multiple reinforcements are arranged on the top surfaces of the cold material frames; and the multiple steel wire shots cover the asbestos cloth. The placing structure can reduce the economic loss in the casting process, and can prevent production accidents caused by overhigh center temperature of continuous casting blanks.

The invention relates to the technical field of electric power fittings, in particular to a buffer and damping wire pulling pole. The buffer and damping wire pulling pole comprises a lower pulling pole body, a first hanging plate, a first spring, a second spring, a second hanging plate and an upper pulling pole body; the lower pulling pole body is of a U-shaped structure, and threads are arrangedat the two column ends of the lower pulling pole body; the two column ends of the lower pulling pole body are sleeved with the two ends of the first hanging plate correspondingly, the two column endsof the lower pulling pole body are sleeved with the first spring and the second spring correspondingly, and the first spring and the second spring are located above the first hanging plate; the two column ends of the lower pulling pole body are sleeved with the two ends of the second hanging plate correspondingly, and the two ends of the second hanging plate are located above the first spring andthe second spring; and the top ends of the two column ends of the lower pulling pole body are in threaded connection with a first nut and a second nut, and the lower end of the upper pulling pole bodydownwards penetrates through the second hanging plate and the first hanging plate in sequence and then is fixedly connected with a plug. According to the buffer and damping wire pulling pole, the structure is simple, the thick energy-storage springs are additionally mounted on the pulling pole bodies, tensioning of the pulling pole bodies on an electric pole can be ensured, the effects of bufferand damping are further achieved, and electric pole toppling due to the situation that fixing piles on the ground are pulled out by the pulling pole bodies under ultra-large tensile force can be prevented.

The invention discloses a special coating liquid for stone paper coating and a preparation method thereof. The special coating liquid for stone paper coating is characterized by comprising the following components in parts by weight: 50-60 parts of silicone acrylic emulsion, 20-30 parts of lamellate calcium carbonate, 15-20 parts of organic silicon modified minute mineral fibers, 1-3 parts of casein, 1-1.5 parts of brightener, 0.5-1 part of disperser, 0.2-0.5 part of cross-linking agent, 50-80 parts of water and 10-20 parts of ethanol. The special coating liquid for stone paper coating of the invention is characterized by containing organic silicon modified mineral fibers which have certain wettability to stone papers. Fibers in the coating liquid can penetrate into inorganic powder in the stone paper surface by coating, so as to enhance adhesive force to solve the problem of pulling off inorganic powders in the stone paper by coating during a printing process to enhance applicability of stone paper in high-speed printing.

The present invention discloses a high-performance ultra-deep water non-bonded pipe joint which comprises a tubular joint body. The head end of the tubular joint body is provided with a joint body flange, the outer wall of the middle section of the tubular joint body is provided with a first annular connecting part, the outer wall of the rear section of the tubular joint body is provided with a second annular connecting part extending to the tail end of the tubular joint body, the inner cavity wall of the rear section of the tubular joint body is sequentially provided with a first cylinder ring groove, a first conical ring groove and a second cylinder ring groove along the axis of the tubular joint body, the two sides of the first cylinder ring groove are communicated with the tail end ofthe tubular joint body and the large end of the first conical ring groove respectively, the small end of the first conical ring groove is communicated with the second cylinder ring groove, the lower end of the side wall of the second cylinder ring groove close to the head end of the tubular joint body is provided with an annular connecting strip, and the annular connecting strip is provided with aCARCASS layer fixing ring. Compared with the prior art, the high-performance ultra-deep water non-bonded pipe joint is improved in connection strength, sealing property and stability, so that the high-performance ultra-deep water non-bonded pipe joint is more suitable for ultra-deep water pipes.

The invention relates to an anti-vibration bar assembly of a steam generator of a CAP1000 nuclear power unit. The anti-vibration bar assembly of the steam generator of the CAP1000 nuclear power unit comprises V-shaped anti-vibration bars and end caps which are respectively arranged at the two ends of the anti-vibration bars, pin holes are formed in the end parts and the end caps of the anti-vibration bars, the anti-vibration bars and the end caps are assembled through pins and the pins and the end caps are fixed through electric welding. The anti-vibration bar assembly comprises four anti-vibration bars which are aligned and arranged in parallel, the end caps on the same side are fixedly connected with a retaining ring, and the parts of the anti-vibration bars adjacent to the corresponding end caps are fixedly connected with the retaining ring by the retaining bar. The invention additionally relates to a preparation method for the anti-vibration bar assembly. The preparation method comprises the steps of anti-vibration bar preparation, end cap preparation, bending, end cap assembling, assembly assembling, check, cleaning and packaging. The anti-vibration bar assembly of the steam generator of the CAP1000 nuclear power unit provided by the invention has the advantages that the structure is simple, the product quality meets the requirement on the precision of the anti-vibration bar of the steam generator in a nuclear power station and the anti-vibration bar is safer to use. The preparation method for the anti-vibration bar has strict preparation steps.

The invention provides a connecting inserting rod, a connecting joint device and a pre-stressed prefabricated part applying the connecting joint. The connecting inserting rod is simple in structure, firm in connection and convenient to install. The connecting inserting rod comprises a rod body, wherein the rod body comprises a connecting part and an inserting part, the end of the inserting part isprovided with a clamping joint which is matched with an outer buckling barrel in a limiting mode, a guide surface is arranged at one end of the clamping joint, at least part of the guide surface is an arc surface, at least two clamping tables are arranged at one end of the buckling barrel and are inserted into the buckling barrel and are in clamping connection with each other, and a plurality ofconnecting joint devices are uniformly and correspondingly arranged between an upper pre-stress prefabricated part and a lower pre-stress prefabricated part. The guide part of the connecting insertingrod is an arc surface, the contact surface of the guide part and the buckling barrel clamping tables is a circular surface, and the contact surfaces in the guide process are free of dead corners andcannot be clamped, so that the insertion of bolts in place is guaranteed, and the connection reliability of a pile body is improved.

The invention relates to a process for manufacturing a PCB board, in particular to technology for processing a PCB board provided with a semi-hole. Aiming at avoiding the phenomenon that copper on the hole wall is pulled off or damaged when the semi-hole is formed, the process that the electric milling of the semi-hole is added before etching and after film removal of a line is adopted, and the semi-hole and the external shape are not completed at the same time when the PCB board is formed. By the process that the electric milling of the semi-hole is added before etching and after film removal of the line, the electric milling is performed when the copper is fully connected with the copper on the hole wall in 360 degrees, thereby avoiding the phenomenon that the copper on the hole wall ispulled off or damaged when the semi-hole is formed, improving the yield of products and lowering cost of an enterprise.

The invention discloses an intelligent tripping-preventive power supply device. The power supply device comprises an upper casing, a pedestal, four jack assemblies into which flat insertion pieces of a plug are inserted, an unlocking ring and an unlocking rod; and each jack assembly comprises a sub-casing, a self-locking piece, a self-locking rod, a sleeve into which the flat insertion piece is inserted, a copper bearing, a conductive connecting piece and a conductive rod. Thus, two jacks, except a jack connected to a ground wire, among three jacks of each group can rotate in the surface of the upper casing around an intersection point of two diagonals of a rectangular opening of the jack, so that both three-pole and two-pole flat plugs can be inserted into the three-pole jack, two three-pole flat plugs or two two-pole flat plugs or one three-pole flat plug and one two-pole flat plug can be inserted into the power supply device at the same time, and the using convenience of the power supply device is improved.