The development direction of fault intelligent diagnosis of hydraulic system
24 Jun 2021
So far, most practical hydraulic system fault detection methods in engineering are based on experienced technicians to judge the fault based on the system pressure, or after the system fails, the pressure and flow sensors are temporarily installed to measure the system pressure or flow to find the fault. The time is longer. Obviously, online fault diagnosis and prediction of hydraulic systems can improve the reliability and utilization of large hydraulic equipment. The focus of future research is mainly on the following three aspects: (1) In-depth study of intelligent diagnosis methods for complex hydraulic system faults At present, most of the papers use BP neural network or expert system to diagnose the faults of single hydraulic components such as hydraulic pumps, hydraulic motors, hydraulic cylinders or system leaks. In the future, intelligent diagnosis methods such as neural network methods and expert system diagnosis methods will be integrated to carry out fault diagnosis researc...
Comparison of advantages and disadvantages of plastic welding methods
16 Jun 2021
Plastics that can be welded usually include materials such as PE, PP, nylon, and PET. At present, plastic welding methods use more ultrasonic welding, friction welding, vibration welding, laser welding, induction welding, high frequency welding, hot air welding and hot plate welding. There is no better, only suitable. The advantages and disadvantages of these welding methods are described below. The characteristic of ultrasonic welding is that the heat is concentrated only on the welding part, and the weld is firm and beautiful. Regardless of the polarity of the plastic, almost all plastic films that are heated and melted can be welded by ultrasonic, which is especially suitable for welding rigid film materials. The advantages of friction welding: high productivity, easy to achieve automation and mechanization; when welding with one material, the joint performance is good, the equipment is simple, and the operation is convenient. Friction welding technology has a wide range of applicat...
Several common ways of plastic welding
07 Jun 2021
Several common ways of plastic welding 1. Hot plate welding method Principle: The welding surface of the plastic parts is directly heated by the metal hot plate to reach a certain melting point. The hot plate is withdrawn, and then a certain pressure is applied to the two plastic parts to achieve the purpose of welding. Application: for PE, PP, nylon, ABS and other thermoplastic plastic parts, such as car lights, water tanks, washing machine gimbals, spray barrels, etc. 2. Rotary welding method Principle: The high temperature generated by the friction between the plastic workpieces by the high-speed rotation of the motor, the contact surface of the plastic workpieces is melted, and then driven by the external pressure to solidify the upper and lower workpieces into one body, becoming a permanent combination Application: filter (household reverse osmosis filter, industrial filter, medical filter, activated carbon filter...) Plastic cups (double-layer cups, beer glasses, water cups, vase...
What is Socket welding
31 May 2021
Socket welding is to extend the pipe into the valve body for welding, and the shape is similar to the internal thread connection after forming. Generally speaking, carbon steel pipes and stainless steel pipes below 2" are used for socket welding; butt welding is also used for stainless steel pipes below 2", such as sliding sleeve flange flanging; titanium pipes, duplex steel, nickel-based Butt welding is basically used for alloys. 1. Socket welding forms fillet welds, while butt welds form butt welds. From the analysis of the strength of the weld, the stress status, etc., the butt joint is better than the socket. Therefore, the butt joint should be adopted in the occasions with higher pressure levels and in the harsh conditions. 2. Socket welding is generally used for small pipe diameters less than or equal to DN40, which is more economical. Butt welding is generally used for those above DN40. The socket welding connection form is mainly used for welding small-diameter valves and pipes...
Application of various plastic welding processes
24 May 2021
A plastic product may be made of multiple materials or components. To combine the components, mechanical fasteners, adhesives, and welding processes can be used. Among the three joining methods, the welding process has the best effect, and the welding forms are various, and different welding processes can be used according to different materials, sizes, and uses. Mechanical fasteners, adhesives and welding processes can all join the two engineering plastics. Mechanical fasteners can quickly connect the two components, but the leak-proof function of the joint is poor, and local stress can also cause the polymer material to separate. Adhesives can provide good properties and form joints with excellent leak-proof functions. However, adhesives are difficult to handle and slow to cure. At the same time, when the adhesive is used for bonding, the preparation of the seam and the cleanliness of the surface are relatively high. Welding can produce a well-bonded seam with mechanical properties c...
Maintenance and maintenance of the electrical system of the automatic Butt fusion welding machines
17 May 2021
Because the automatic hot melt welding machine needs to work in a very harsh environment, and often uses different types of power generation equipment and power sources, and may work with other electronic equipment at the same time, the equipment cannot avoid electrical failures. In the process of using the automatic Butt fusion welding machines, the maintenance of the equipment should be done well. Electrical equipment maintenance The connecting plugs and sockets of the heating plate and the control box, and the connection part of the rack signal rack and the rack must be kept dry. Be sure to check whether the touch panel of the computer is damaged, and whether the switch is loose or damaged. Troubleshooting method: Common faults of the automatic hot melt electrical system include component aging faults, unexpected faults and man-made faults. The hot plate and milling cutters have the highest aging failure rate; the racks have the highest accidental failure rate; the hot plate milling...