Length measurement method of straight seam steel pipe

1. Length measurement by measuring scale

The basic principle is: straight seam steel pipe outside the two ends are set up two fixed length of the scale, the use of rodless cylinder driven scale is characterized by high accuracy. However, the scale is expensive and difficult to maintain, sensitive to the impact of dust and site vibration.

2. Camera length measurement

Camera length measurement is the use of image processing to achieve the length of steel pipe measurement, the principle is to install a series of equal distance photoelectric switch on a section of the straight seam steel pipe conveyor roller conveyor, in another section with a light source and camera. When the steel pipe passes through this area, the length of the steel pipe can be determined according to the position of a photoelectric switch on the screen through the image taken by the camera.

The feature is that online measurement can be realized, and the length data can be obtained when the steel pipe passes through the length measurement area without interval. The disadvantage is that: if you do not use ad hoc light source irradiation, the steel pipe will be subject to interference from external light, and the use of ad hoc light source due to the high brightness of the steel pipe after chamfering the end of the tube and the reflection of light is very strong, easy to cause reading errors.

3. Encoder length measurement

The principle is to install the encoder at the cylinder, using the cylinder to push the steel pipe in the roller conveyor movement, on the other side of the installation of a series of equal distance photoelectric switch, when the steel pipe is pushed by the cylinder end touches the photoelectric switch, from the recorded encoder readings, converted to the cylinder stroke, so that the length of the steel pipe can be calculated.

The characteristic is that the steel tube needs to be lifted when measuring the length. In addition, there is some error in photoelectric switch detection, which may require full measurement.

4. Improved encoder length measurement

This method is an indirect measurement method, by measuring the distance between the two ends of the steel pipe and the respective reference point, the length of the steel pipe is measured indirectly. At each end of the steel pipe set up a length measurement trolley, the initial position of zero, the spacing is L. Then move the editor length to the respective pipe end of the walking distance (L2, L3), L - L2 - L3, that is, the length of the steel pipe.

This measurement method to overcome the huge size of the steel pipe, the production site environment is complex, the measurement mechanism can not cross the lower steel pipe support bench and other difficulties. This method is easy to operate and the measurement accuracy is within ±10mm, with a repeatability of ≤5mm.

Surface treatment of straight seam steel pipe

With the continuous development of China's economy, the country vigorously develop the energy industry, long-distance oil and gas pipeline is an important way of energy security, in the process of oil and gas pipeline anti-corrosion construction, straight seam steel pipe surface treatment is one of the key factors to determine the service life of the pipeline anti-corrosion, it is the premise that the anti-corrosion layer and steel pipe can be firmly combined. Verified by research institutions, the life of the anti-corrosion layer in addition to the type of coating, coating quality and construction environment and other factors, straight seam steel pipe surface treatment on the life of the anti-corrosion layer of about 50% of the impact, therefore, should be strictly in accordance with the requirements of the anti-corrosion layer specification for the surface of the steel pipe, continuous exploration and summary, and constantly improve the surface treatment of steel pipe.

1.cleaning of straight seam steel pipe The use of solvents, emulsions to clean the steel surface to remove oil, grease, dust, lubricants and similar organic substances, but it can not remove the steel surface rust, oxide skin, welding powder, etc., and therefore only as an auxiliary means in the production of anti-corrosion.

2. tool rust removal of straight seam steel pipe Mainly using tools such as wire brushes to polish the steel surface, which can remove loose or buckled oxidation, rust, weld slag, etc. Manual tool rust removal can reach Sa2 level, power tool rust removal can reach Sa3 level, if the steel surface is firmly attached to the iron oxide skin, tool rust removal effect is not ideal, not up to the depth of the anchor pattern required for anti-corrosion construction

3. Pickling of straight seam steel pipe Generally, two methods of chemical and electrolytic pickling are used to do the pickling treatment, and only chemical pickling is used for pipeline corrosion protection, which can remove the oxide skin, rust and old coating, and sometimes it can be used as reprocessing after sandblasting rust removal. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchor pattern is shallow, and it is easy to cause pollution to the environment.

Cangzhou Shenlong Pipe Manufacturing Co., Ltd. is an enterprise specializing in the production, processing and sales of various steel pipes and pipe fittings, with its production base located in Cangzhou, Hebei Province. It was founded in 1992 and covers an area of more than 60,000 square meters. Our products are exported to the Middle East, Europe, Africa and America, and are widely used in the fields of oil mining, chemical industry, water conservancy, construction and so on. We can provide first-class quality and professional technical service! Welcome to contact us!