With the development of high-speed and heavy-duty tracks, seamless tracks have become the best choice for high-speed and heavy-duty track structures due to their high reliability and stability. The orbital welding machine, one of the keys to seamless circuits, has an important influence on the development of seamless circuits.
What is the application of orbital welding machines?
How is the orbital welding machine used?
What are the features of the orbital welding machine?
At present, the development of railways is mainly towards high-speed passenger cars, subway passenger cars, light rail cars, high-speed heavy trucks, etc. To meet these requirements, it is necessary to adjust the weight of the trains. Nowadays, it is common practice to use aluminum alloy materials in the manufacturing process of passenger cars. Because aluminum alloy materials have the characteristics of light weight, corrosion resistance, smooth appearance, complex curved surfaces and high specific strength, they can effectively reduce the resistance and quality of passenger cars. Increased overload. In order to effectively improve the processing efficiency of aluminum alloy materials, it is necessary to change the traditional processing method and use the welding technology of orbital welding machine for processing and manufacturing.
(1) Welded parts preparation: Given the high hardness of rail steel, it is difficult to process the groove on site. Therefore, the orbital welding machine adopts the docking method and uses the existing end surface of the rail as the working surface. If the end face is heavily corroded, the angle grinder must be used to polish the surface bare.
(2) Determination of the impact gap: Given the height of the rail itself, the gap must not be too small, otherwise the welding wire for welding work cannot penetrate it, so it is necessary to reserve enough gap.
(3) Welding preheating: In the preheating process of orbital welding machine, a gas welding torch is used for preheating, and an infrared temperature measuring gun is used to ensure that the preheating reaches the specified temperature.
(4) Shock surface process: The entire welding process adopts the multi-layer multi-pass welding process. Although this process is relatively inefficient, it can ensure the weld strength and temperature between the layers.
(5) Heat treatment after welding: The heating process of the orbital welding machine uses a gas welding torch. After heating to the specified temperature, asbestos felt is used for heat preservation to prevent the appearance of cracks after welding.
(6) Grinding the workpiece after welding: The orbital welding machine keeps the weld seam and the base metal of the rail smooth.
The biggest feature of orbital welding machine is small-scale local heating, high heating efficiency, easy operation, which is very suitable for fast heating and cooling of high manganese steel welding, and also suitable for welding repairs of local defects on rails. It is currently the most widely used method for welding rails and track grooves. Methods. However, it must be noted that the orbital welding machine for rail welding must be properly preheated. Due to local heating and rapid cooling of the rail, slightly abnormal brittle structures such as martensite and bainite can be generated, which increases the brittleness of the rail. Preheating prevents abnormal tissue formation.
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Tank hydraulic jacking system is mainly a closed or meshed hoistway enclosed by buildings or light steel structures and hydraulically driven cylinders to lift the platform.
Here is the content list:
l What are the components of installing a tank hydraulic jacking system?
l What are the performance characteristics of installing tank hydraulic jacking system?
l How to install tank hydraulic jacking system?
Tank hydraulic jacking system is mainly a closed or meshed hoistway enclosed by buildings or light steel structures and hydraulically driven cylinders to lift the platform. Its main components are:
1. Hoistway part: a closed or net-like frame enclosed by a building or light steel structure, with steel guide rails installed on both sides of the inside
2. Driving part: a small oil tank hydraulic jacking system with hydraulic components such as hydraulic driving motor, oil pump, safety valve, speed control valve and reversing valve
3. Oil cylinder part: it is composed of one or more tank hydraulic jacking system of the lifting oil cylinder straight-top platform or jacking scissor frame
4. Door system: It is a closed or net-shaped platform door or landing door system composed of steel structure. There are manual doors and automatic doors. Generally, open platforms do not have doors.
5. Electrical part: it is composed of power, control, signal, safety and lighting devices
6. Platform part: It is a steel structure platform that carries heavy objects. It has a closed type (ie car type) or an open type. Both sides are equipped with guide rollers or guide shoes. The bottom of the platform can be connected with a lifting cylinder or a lifting scissors steel frame
7. Auxiliary part: it is composed of hydraulic pipe fittings, pipelines, pressure gauges and steel structure base
8. Safety device: safety valve, limit limit, door electromechanical interlock, rupture valve, emergency switch and electrical short circuit protection, etc.
The tank hydraulic jacking system is generally equipped with safety protection devices such as anti-falling, overloading, power failure, etc., rail-type external power unit, using hanging chains or cross bars at the entrance and exit of the table, guardrails and lifting platform operating warning lights or warning bells, when the door is opened Many functions such as a safety switch to close the circuit of the elevator platform. It is extremely convenient and convenient for the operator to control multiple points in each working layer, and operate in jog or safe mode.
The large carrying capacity, stable lifting, simple and convenient installation and maintenance, and it is an economical and practical low-floor elevator to replace the ideal cargo conveying equipment. According to the installation environment and use requirements of the tank hydraulic jacking system, different fixed hydraulic jacks can be selected, and different optional configurations can be selected to complete the task of lifting objects and achieve better results.
If the tank hydraulic jacking system requires a large size, a fixed double-span hydraulic lift can be used. The double-span type has stable lifting, large carrying capacity and simple operation. It is widely used in vehicle maintenance, kilns, chemical plants, equipment supporting, etc. Industry use.
The tank hydraulic jacking system is suitable for installation and use under various environmental conditions indoors and outdoors. The tank hydraulic jacking system can be installed in a closed hoistway or between open floors, in a concave foundation pit or on a flat ground according to the requirements of use.
Due to the height of the building or work shelf, the size and weight of the objects carried, and other usage requirements, there are many uncertain factors in the tank hydraulic jacking system model. When the models shown in the list are not suitable for use requirements, the elevation, carrying capacity, platform area, etc. of the lifting platform can be combined according to the actual use environment and operating requirements to achieve the desired use effect.
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Tank welding machine is the process of joining metal parts using various fusible alloys. The melting point of the solder is lower than that of the material to be soldered, so that the part will end the soldering through inter molecular contact on its surface without being melted.
Here is the content list:
l What is the working principle of tank welding machines?
l What is the purpose of using tank welding machines?
l What are the application significance of tank welding machines?
What is the working principle of tank welding machines?
Tank welding machines can be divided into soft welding and hard welding. The temperature of soft welding is lower than 450℃, and the temperature of hard welding is higher than 450℃. Hard welding is usually used for metals such as silver, gold, steel, copper, and its welding point is much stronger than soft welding, and its shear strength is 20 to 30 times that of soft welding. The above two types of thermal connections usually use the term soldering, because in both cases molten solder is written into two elongated gaps between the clean and close solid metal surfaces of the device.
Tank welding machines ensure the continuity of the metal. On the one hand, two metals are connected by bolts or physical attachments to each other, showing a strong metal whole, but this connection is not continuous. Sometimes if there is an oxide insulating film on the metal surface, they may even Right or wrong physical contact.Another disadvantage of mechanical connection compared with welding is that the contact surface continues to oxidize, resulting in an increase in resistance. In addition, vibrations and other mechanical shocks can also loosen the joint. Welding eliminates these problems. The tank welding machines do not move relative to each other, the contact surface will not be oxidized, and the continuous conduction method can be maintained.
What is the purpose of using tank welding machines?
Tank welding machines welding is a process of fusion between two metals, mainly for the purpose of dissolving some of the metal in contact with the solder in the molten state, and the surface of the metal being welded often has a thin oxide film that cannot be dissolved by the solder. The flux is used to remove this oxide film. The tank welding machines welding process usually includes:
l 1) Melting of the flux to remove the oxide film on the surface of the welded metal;
l 2) Melting the solder makes the impure substances and lighter flux suspended in it float to the surface;
l 3) Some dissolve some metal connected with solder;
l 4) Cool and end the melting of metal and solder.
Through temperature changes, humidity, vibration, etc., even a bad solder joint can cause some or all of the system to lose control. There are countless welding points in the equipment, and the reliability of these welding points should even be higher than the equipment itself.
For the purpose of using tank welding machines, research in this area has led to the addition of knowledge of materials and their properties, and many developments have been made in the possible welding processes. Welding technology is an accompanying technology.
With the development of the electronics industry, more useful packaging technologies and smaller components will certainly continue to emerge. Welding technology will also continue to be developed to meet the needs of the electronics industry and environmental issues. This is why welding is becoming more and more professional for technology professors who work in the electronics industry today!
What are the application significance of tank welding machines?
The auxiliary equipment of the tank welding machines includes gas welding glasses to prevent the operator from being damaged by the ultraviolet, infrared or other rays generated by the welding arc or other welding energy, the mask to protect the eyes, face and neck of the welder during arc welding, white work clothes, welder gloves and protective guards.
l Energy efficient.
The energy saving of the electric welding machine is embodied in two aspects: energy saving at no load and energy saving at load. According to relevant statistics, in 2008, the demand for tank welding machines in the domestic welding industry was 890,000 units. If all electric welding machines are used, it can directly save 43,000 tons of copper, 64,000 tons of steel, and save 680 million KW.H of electricity. It saved 566,500 tons of coal, 10.34 million tons of water, and reduced 1,144,500 tons of CO2 emissions. It can be seen that vigorously promoting tank welding machines has huge economic and social benefits.
l Stable performance
Since the working frequency of the tank welding machines is above 20KHZ, it has a faster response speed, and the droplet transfer can be subdivided into multiple stages for control. For CO2 gas shielded welding, spatter can be greatly reduced. For pulsed melting pole MIG/MAG welding, the stability of jet transition can be effectively controlled, and the droplet transition and the movement of the wire feeding mechanism can be combined to further control the melting. During the dripping transition process, a good weld formation is obtained and the welding performance is stable. These are things that traditional rectifier welding machines cannot do.
l Centralized control
The tank welding machines uses a large number of digital controllers such as single-chip microcomputer, DSP, FPGA, etc., and realizes the network communication between multiple welding machines or the upper computer and the welding machine through Ethernet and field bus. It not only solves the problem of coordinated operation of multiple welding machines, and facilitates centralized control in the welding process, but also realizes the setting or monitoring of remote welding machine parameters, making remote fault diagnosis and maintenance of tank welding machines possible.
Anyone with a little mechanical knowledge knows that energy can be transformed into each other. It is best to apply this knowledge to the tank hydraulic jacking system to explain the power loss of the hydraulic system. Next, we will introduce in detail how to maintain the tank hydraulic jacking system.
Here is the content list:
l Maintain the tank hydraulic jacking system from the perspective of power source.
l Maintain the tank hydraulic jacking system from a pressure perspective.
l Maintain the tank hydraulic jacking system from the perspective of speed regulation.
Maintain the tank hydraulic jacking system from the perspective of power source.
On the one hand, the power of tank hydraulic jacking system will cause energy loss and reduce the overall efficiency of the system. On the other hand, this part of the energy lost will be converted into heat energy, which will increase the temperature of the hydraulic oil and the deterioration of the oil. The tank hydraulic jacking system is malfunctioning. Therefore, when designing a tank hydraulic jacking system, under the premise of meeting the requirements of use, full consideration should be given to reducing the power loss of the system.
First of all, considering the power source-pump, considering the diversified working conditions of tank hydraulic jacking system actuators, sometimes the system requires large flow and low pressure; sometimes it requires small flow and high pressure.
Therefore, it is appropriate to choose a pressure-limiting variable pump, because the flow rate of this type of pump changes with the change of the system pressure. When the tank hydraulic jacking system pressure decreases, the flow rate is relatively large, which can satisfy the fast stroke of the actuator. When the tank hydraulic jacking system pressure increases, the flow rate decreases accordingly, which can meet the working stroke of the actuator. This can not only meet the working requirements of the actuator, but also make the power consumption more reasonable.
Maintain the tank hydraulic jacking system from a pressure perspective.
Second, when hydraulic oil flows through various types of hydraulic valves, there will inevitably be pressure loss and flow loss. This part of the energy loss occupies a large proportion of the total energy loss.
Therefore, reasonable selection of hydraulics and adjustment of pressure valve pressure are also an important aspect of reducing power loss. The flow valve is selected according to the flow adjustment range in the tank hydraulic jacking system and its minimum stable flow can meet the requirements of use. The pressure of the pressure valve should be as low as possible when the hydraulic equipment is working normally.
Maintain the tank hydraulic jacking system from the perspective of speed regulation.
Third, if the actuator has speed regulation requirements, when selecting a speed regulation loop, it is necessary to meet the speed regulation requirements while minimizing power loss. The speed control circuits of common tank hydraulic jacking system mainly include: throttle speed control circuit, volume speed control circuit, volume throttle speed control circuit.
The throttling speed control loop in the tank hydraulic jacking system has large power loss and good low-speed stability. The volumetric speed control circuit has neither overflow loss nor throttling loss, which has high efficiency but poor low-speed stability. If the tank hydraulic jacking system needs to meet both requirements at the same time, a volume throttling speed control circuit composed of a differential pressure variable pump and a throttle valve can be used, and the pressure difference between the two ends of the throttle valve should be as small as possible to reduce pressure loss.
In summary, a reasonable choice of hydraulic pressure is crucial. When the hydraulic oil flows in the pipeline, it will exhibit viscosity, and when the viscosity is too high, it will generate greater internal friction, causing the oil to heat up, and at the same time increase the resistance when the oil flows. When the viscosity is too low, it is easy to cause leakage, which will reduce the volumetric efficiency of the tank hydraulic jacking system.
Therefore, generally choose oil with suitable viscosity and good viscosity-temperature characteristics. In addition, when the oil flows in the pipeline, there are pressure loss and local pressure loss along the way. Therefore, when designing the tank hydraulic jacking system pipeline, the pipeline should be shortened as much as possible while reducing the number of bends.
The above are the recommended maintenance points to avoid the power loss of the oil tank hydraulic jacking system. However, there are many factors that affect the power loss of the tank hydraulic jacking system. Therefore, if specific maintenance is performed on the storage tank hydraulic jacking system, other requirements should be considered comprehensively!