Main equipment of high frequency electrical resistance welded steel pipe production line

Main equipment of high frequency electrical resistance welded steel pipe production line are as follows:
1, The uncoiler
The hot rolled steel strip is taken apart and sent to the strip leveler. It is divided into two types: unwinding and unwinding. The uncoiler is the line front end equipment of the high frequency welded pipe production line.

2, Steel belt leveling machine
The strip is leveled before the welded pipe unit is formed. Generally, there are upper base, lower base, transmission device, etc., there are five rolls, seven rolls, etc. In the high frequency welded pipe production line, a pinch roll is usually arranged in front of the leveling machine.

3, Shear butt welding machine
In order to ensure the continuous production of the high-frequency welded pipe production line, it is necessary to cut the irregular ends of the front and rear strips by the shear butt welder, and clamp and weld them together to form a continuously produced strip.

4, Storage material loop
In order to meet the continuous production of high-frequency welded pipe units, a looper storage device must be installed before the strip head-to-tail shear butt welding station, so that the strip can be unrolled during the unloading of the strip, and the preparation of the butt welding is completed. Pre-stored strips are continuously delivered to ensure continuous operation of the high-frequency welded pipe production line.

5, Horizontal looper
Horizontal spiral looper is suitable for strip thickness range of 0.4-16mm, and suitable high frequency welded pipe production specifications Ф14-Ф610mm. The horizontal looper mainly consists of an inlet guide, a charging and its transmission system, an inner and outer roller cage, a center roller system and an outlet guide. The main advantage is that it can be filled at any time, the deformation of the strip is small, and the maintenance is convenient. Filling for high frequency welded pipe continuous and stable production of the production line provides protection.

6, Disc shears
The strips are cut and trimmed on both sides to meet the requirements of the strip width and straightness of the high-frequency welded pipe unit forming machine. Its main components include cutting edge, cutting edge shaft, width adjustment mechanism, weight adjustment and clearance mechanism, upper and lower guide rollers, transmission mechanism and so on. It is prepared for the regularity of the welded pipe after the welded pipe is formed on the high-frequency welded pipe production line.

7, High frequency welded pipe production line milling machine
For the steel belt of 10mm or more, in order to ensure the high-frequency welding quality, it is necessary to mill the edge of the steel strip to obtain the strip edge of a certain geometric shape and size, which is advantageous for high-frequency welding. The edge milling machine is mainly composed of two sets of milling cutters, automatic control system, AC speed regulation or DC speed control transmission system arranged horizontally on both sides of the strip. It can greatly improve the quality of high frequency welding and reduce material consumption.

8, Molding machine
Can be divided into two categories of spiral line forming machine and straight seam welded pipe forming machine. The spiral line forming machine is divided into two types: external control type and internal control type. The straight seam welded pipe forming machine is divided into straight seam resistance roll forming and straight seam submerged arc welding molding. The molding machine is an important component of the high-frequency welded pipe production line.

9, Welded pipe mold
The welded pipe mold is the main mold of the high-frequency welded pipe production line and the cold-formed steel production line, and is the main consumable part. The types of molds are divided into casting molds and forging molds according to the manufacturing method; they are divided into integral mold rolls and combined molds according to the process method. Its quality directly affects the quality, output and cost of the product. A good mold should contain three aspects: 1.According to the deformation law of the strip, the mold hole design to ensure the quality of the welded pipe; 2.The mold material must have high strength, high hardness, high wear resistance and toughness, to ensure that it has a longer Lifetime; 3.According to the performance of the product, the corresponding mold material, manufacturing method and manufacturing process are selected to achieve practicability and economy.

10, High frequency welding equipment
Using the skin effect and proximity effect of the high-frequency current, the metal of the welded pipe to be welded can be rapidly heated to a molten state, and welding is achieved by extrusion. High frequency welding usually uses a current frequency range of 300-450 KHZ and a power of 100-1000 KW. At present, the use of solid-state high-frequency welding machines is advocated. High-frequency welding equipment is one of the core equipment of high-frequency welded pipe production line.

11, Sizing machine
In the high-frequency welded pipe production line, the sizing unit usually consists of several horizontal frames and passive roller frames and correcting devices to ensure the accuracy of the outer diameter and cross-section of the steel pipe, and also improve the forming and high frequency. Stress concentration and residual stress in welding production. The sizing machine is also one of the main components of the high frequency welded pipe production line.

12, High frequency welded pipe production line internal burr machine
In the ERW welded pipe process, it is used to remove the weld burr device in the welded pipe. Commonly used is a shaft diameter bidirectional hydraulic internal burr removal device. Mainly composed of shaft, neck hydraulic cylinder, linkage mechanism and tool height adjustment mechanism. The tool is excellent with a ring cutter.

13, High frequency welded pipe production line - weld heat treatment
In the ERW welded pipe process, normalizing the weld, including the heat affected zone, or quenching + tempering and normalizing + tempering of the weld. The metallographic structure and mechanical properties of the weld are consistent with the metallographic structure and mechanical properties of the base metal to eliminate welding stress and improve weld performance. The most widely used is the intermediate frequency heat treatment machine.

14, Fixed-length flying saw
Fixed-length flying saws are important equipment for high-frequency welded pipe production lines. High-precision fixed-length cutting is achieved in the high-frequency welded pipe online operation. The cutting form includes sawing, rotary cutting and punching. According to the driving form, the AC computer flying saw, the DC computer flying saw and the servo control computer flying saw can automatically control the cut.

15. High-frequency welded pipe production line straightening machine
Although the sizing device is radially shaped, the high-frequency welded pipe still has a certain degree of curvature in the longitudinal direction. For this purpose, the high-frequency welded pipe must be straightened, and the straightening machine is generally divided into a pressure straightening machine and a roller straightening machine. The working principle of the roller straightening machine is: the high-frequency welded pipe is linearly advanced between the inclined double-curved straightening rollers, and the rotating motion is also performed, and the high-frequency welded pipe repeatedly elastoplastically bends the high-frequency welded pipe to make the high-frequency bending The welded pipe achieves the purpose of correction.

16, High frequency welded pipe production line flat head machine
The ends of the high-frequency welded pipe cut by the computer flying saw usually leave some notch defects and burrs. In order to meet the requirements of the subsequent process and the user's groove, the burrs and inner and outer edges of the high-frequency welded pipe ends need to be trimmed. The flat head machine is a device for milling the ends of the high-frequency welded pipe to make it flat and chamfered. It consists of high-frequency welded pipe feeding device, high-frequency welded pipe clamping device, tool holder, follower device, speed control device and frame body. The working process of the flat head machine can realize automatic continuous cycle and automatic control.

17. High-frequency welded pipe production line hydraulic testing machine
The hydraulic test is the main equipment for the production of high frequency welded pipes. At present, the hydraulic testing machine used in the production of high-frequency welded pipes has the following working processes: feeding, clamping, water filling, pressurization, pressure keeping, pressure relief, and discharging. The process also constitutes the basic action cycle of the test tube hydraulic press. The modern hydraulic test machine adopts PLC control, so that each work process is automatically completed in turn, and has the function of automatically recording the test result parameters. According to the form of the seal, it can be divided into a radial seal and an end seal. The radial seal adopts a sealing ring matched with the inner diameter or outer diameter of the high-frequency welded pipe, and the purpose of sealing the pipe wall by the pressure expansion of the sealing ring is that the high-frequency welded pipe is easy to clamp and extract, and the sealing is reliable. The high-frequency welded pipe has small axial force and is not easy to bend, but the structure of the sealing head is more complicated, the specifications are more, and there is a test blind zone at the pipe end; the end face sealing relies on the sealing material and the end face of the pipe to achieve the purpose of sealing the pipe mouth. The advantage is that the test structure is simple and versatile, but the requirements of the sealing material performance and the oil-water pressure difference ratio and the servo control system are high.

18, High frequency welded pipe production line ultrasonic flaw detection
The non-destructive testing method for detecting internal defects of high-frequency welded pipes by using the principle that diffraction occurs when ultrasonic waves encounter different density medium interfaces during propagation.

19. Eddy current testing of high frequency welded pipe production line
It is mostly used for on-line detection of small-diameter ERW high-frequency welded pipe. Because the probe is not in contact with the pipe surface, it can realize high-speed flaw detection. It is sensitive to the detection of defects on the surface of high-frequency welded pipe, and it is not ideal for detecting defects of the probe layer and defects on the inner surface. It can detect high-frequency welded pipe body and high-frequency welded pipe weld defects, and can use impedance plane technology to analyze the location and depth of the defect.