149results about How to "Easy to rust" patented technology

The invention discloses a synchronous wheel conveying mechanism, which is provided with a synchronous wheel mechanism and a hair brush belt, and conveying of LCD (Liquid Crystal Display) glass substrates is realized by driving the hair brush belt with the synchronous wheel mechanism. Moreover, a tension device is further arranged to control the tightness of the hair brush belt so as to ensure safe and stable conveying. The synchronous wheel conveying mechanism has the advantages of increase in equipment accuracy, increase in product yield and reduction in the production cost.

The invention relates to an electrified accelerated corrosion reinforced concrete test device and method. An electrolyte (2) in the device is placed in a box (1); a cathode (3) is placed in the electrolyte (2) and connected with the negative pole of a direct-current power supply (9) through a wire (6); a reinforced concrete test piece (4) is composed of concrete (10) and a steel bar (11) and placed in the wooden box (1); the steel bar (11) is connected with the positive pole of the direct-current power supply (9) through a wire (6) and serves as an electrified anode; a probe of a humidity monitor (5) is placed in the electrolyte (2); a resistor (7) is connected with wire (6) in a welded mode and connected with the steel bar (11) and the direct-current power supply (9) in series; a data recorder (8) is connected with the two ends of the resistor (7) through a wire (6). The method comprises the following steps that the reinforced concrete test piece is prepared and subjected to an electrified accelerated corrosion test. The feasibility and practicability of the test device and method are comprehensively evaluated through electrified corrosion efficiency calculation and steel bar corrosion product determination.

The invention belongs to the technical field of experimental facilities used for testing dynamic mechanical properties of a material in a low-temperature environment and in particular relates to a low-temperature environmental chamber used for performing a Hopkinson bar experiment on an ice material. The low-temperature environmental chamber comprises a thermal insulation system, a refrigeration temperature control system and an experiment and observation system; a thermal insulation material fills a gap between an outer chamber body and an inner chamber body, a polytetrafluoroethylene sealingpart is arranged at the periphery of each of left and right rod holes; a compressor and a cooling fan are mounted on a platform outside a chamber body; a refrigeration pipe and an aluminum plate aremounted on the bottom surface and the left and right inner walls of the cavity of the inner chamber body; a temperature sensor is composed of a display screen and a temperature measuring probe, the temperature measuring probe is mounted in an experimental cavity, and the display screen is mounted outside the chamber body; and high-transparency glass observation windows are mounted in front, on theback and at the upper part of the chamber body. The low-temperature environmental chamber provided by the invention selects Freon as a refrigerant, a technology is mature and reliable, and cost is low, so that an experimental temperature can be maintained to be stable for a long time. The observation windows are formed in three directions respectively, so that illumination and image acquisition are facilitated in an experiment process.

The present invention relates to a valve, in particular, it relates to a cam valve. Said cam valve is characterized by adopting cam shaft and connecting sleeve and utilizing intermediate connecting shaft to drive valve Clark so as to implement control. Said cam valve includes valve body, valve seat, valve Clark and handle. Said valve clark is fixedly connected with one end of connecting sleeve by means of intermediate connecting shaft, another end of said connecting sleeve is connected with the cam shaft; said cam shaft can be used for driving valve clark and making it implement axial movement, and the cam shaft is fixedly connected with the handle.

The invention relates to a glass reinforced plastic elbow die and a manufacturing method thereof. The die comprises an end cover, a connection section die, an elbow die body, an intermediate plate and a pull rod. The elbow die body consists of an elbow inner template and an elbow outer template which are made of glass reinforced plastic material. The lengths of arc seams at both sides, which are butted in a matching mode, are at least 10mm. The connection section die is one of a straight tube connection section die, a butting connection section die, a socket connection section die and a lap joint flange connection section die. The manufacturing method of the elbow die body comprises the following steps of: 1, making a scraper; 2, making a cement die; 3, duplicating a glass reinforced plastic die; 4, carrying out machining; and 5, carrying out surface polishing treatment. The glass reinforced plastic elbow die and the manufacturing method solve the problem that the steel is easy to rust, are easy to repair, have the advantages of simple structure, high precision, high quality, high productivity and low manufacturing cost and are easy to demould. A product produced by the elbow die has a smooth inner wall, good seepage prevention performance and attractive appearance. The materials are saved. Due to the adoption of the elbow die, not only can the requirement of a hand lay-up process be met, but also the requirements of a mechanical winding process can be met.

A protector which prevents damage to a solid lubricating coating on a threaded portion of a threaded joint when the protector is mounted on a pin or a box of a threaded joint for pipes in which at least one of the pin or the box is lubricated with a solid lubricating coating comprises a tubular member having a threaded portion on its inner or outer peripheral surface which threadingly engages with at least a portion and preferably 3-5 complete threads of the threaded portion provided on the pin or the box to be protected. The thread height H1 of the threaded portion of the protector and the thread height H2 of the complete thread of the pin or the box on which the protector is mounted satisfy H1>H2, and the difference between H1 and H2 [=H1−H2] is larger than the maximum coating thickness at the thread crest of the solid lubricating coating which covers the threaded portion of the pin or the box.