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Comparison of new cement pipe making technology and traditional technology

Today's core mold vibration process has long been recognized and accepted by major small and medium-sized enterprises, and through continuous research and development and innovation in recent years, it has become a mature pipe-making process. There is no doubt about the quality of the products produced, and in terms of its own characteristics and advantages, compared with traditional craftsmanship, it has many advantages. Our previous cement pipe-making process requires a lot of manual labor. Nowadays, the mandrel vibration process adopts mechanized operation production, which not only saves labor, but also greatly reduces the labor labor, even for older people. A little operator can also be competent for this job, and jobs are also provided for the employment of the elderly. The whole process of this process is less, which removes many trivial affairs in traditional processes, saves time and improves efficiency. This process equipment uses dry and hard concrete, so the cement pipe produced has high quality strength and good uniformity, which is also impossible to achieve by traditional processes.

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How is the cement pipe made?

 2022-01--13

I have learned so much about the vibration of the core mold and the radial extrusion process before, and everyone must have some understanding. So how do these pipe-making processes make cement pipes? This question must be what everyone wants to know. Today, I will talk about how cement pipes are made. Since it is the production of cement pipes, sand, stones, cement, etc. must be used as raw materials for production. After that, it was applied to our pipe-making equipment and principles, using the roller pressure and centrifugal force generated by the rotation of the roller shaft and the steel mold to make the raw material densely formed. It can be said that the hanging roller pipe making machine is a very simple and practical cement pipe making equipment. Its application range includes the production of drainage, sewage, highway culverts and machine shaft pipes, and adopts a new structure with two fulcrums. Its production process is firstly that the pipe mold is driven by the roller, rotates at different speeds at different stages according to the requirements, continuously feeds a certain amount of concrete, and is compacted under the action of the pressing shaft and centrifugal force to complete the production of cement pipes. .

Components of radial extrusion equipment

 2022-01--13

Radial extrusion can be said to be a combination of a variety of pipe-making equipment, and has certain requirements for the size of the operating workshop environment. First of all, a workshop of about 1,800 square meters is required, and the height must not be less than 13 meters. The following will introduce the components of the radial extrusion equipment. Concrete placing machine: This equipment is located above the pipe making machine, which can effectively convey the concrete evenly to the pipe form, and control the speed of the material according to the actual demand. Multi-layer extrusion head: using a counter-rotating vibrator, the vibrator includes a high-speed running device and a low-speed tamping device. The rotation directions of the two are diametrically opposite, and the compaction device is mainly driven by two infinitely adjustable hydraulic motors. It can effectively densify the concrete and control the deformation of the reinforcement cage. Socket vibrator: The socket of the concrete pipe is formed by the vibrator installed under the main machine through the vibration operation. Electronic control system: This system can effectively control the speed at which the concrete is filled into the mold, and it can also control the rising speed of the vibrator.

How the seam welder works

 2022-01--13

The following three types can be classified according to the electromechanical matching method of the rotation of the roller electrode (movement of the welding piece) and the passage of the welding current (energization). continuous seam welding The roller electrode rotates continuously, the weldment moves at a constant speed, the welding current passes continuously, and a weld spot is formed every half cycle. The welding speed can reach 10~20m/min. Practical applications are limited due to poor welding surface quality. intermittent seam welding The weldment is moved continuously at a constant speed, and the welding current is passed intermittently, "on-off" each time to form a weld. Welding speed 0.5~4.3m/min according to plate thickness, widely used, mainly produces ferrous metal gas, water, oil seal welds Step seam welding The weldment moves intermittently, and the welding current flows while the weldment is stationary. Welds are formed one at a time "in shift" and forging pressure can be applied. Joint formation is very similar to spot welding. The welding speed is low, generally only 0.2~0.6m/min. It is only used for making high sealing welding, such as aluminum alloy and magnesium alloy.

The working principle of seam welding machine

 2022-01--13

During the seam forming process (intermittent) seam welding, each solder joint is also subjected to three stages of pre-pressing, electrical heating and cooling crystallization. However, due to the rapid changes in the relative position between the roll electrode and the weldment during seam welding, these three stages are not as distinct as those distinguished by spot welding. Can consider it: 1) Under the direct compression of the roller electrode, the metal heated by the electric current is in the "electric heating stage". 2) The adjacent metal that is about to enter the roller electrode is subjected to a certain preheating and partial pressure of the roller electrode, and is in the "preloading stage". 3) The adjacent metal just exposed from the bottom of the roller electrode begins to cool on the one hand, and is pressed by the roller electrode part in the same way, and is in the "cooling crystallization stage". Therefore, the weld zone below the roller electrode and the metal material on both sides adjacent to it will be in different stages at the same time. For any spot on the weld, the process of passing under the rollers is a three-stage process of "preload - heat - cool to crystallize". Since the process is carried out under dynamic conditions, the pressure in the preloading and cooling crystallization stages is insufficient, the quality of the seam welding head should generally be worse than that of the spot welding, and cracks such as cracks and shrinkage are prone to holes.

Introduction to Spot Welding Electromechanical Welding Operation

 2022-01--13

The spot welding of the spot welding machine usually adopts the lap joint and the lap joint. The joint can consist of two or more workpieces of equal or unequal thickness. In the design of spot welding structure, the accessibility of the electrode must be considered, that is, the electrode must be able to easily reach the welding part of the workpiece. At the same time, factors such as edge distance, overlap amount, solder joint distance, assembly clearance and solder joint strength should also be considered. The minimum edge distance depends on the type of metal to be welded, thickness and welding conditions. Smaller values may be used for metals with high yield strength, flakes or high strength metals. The smaller value of the specified point distance is mainly to consider the effect of shunt. When the use conditions are strong and the electrode pressure is large, the dot spacing can be appropriately reduced. When using thermal expansion monitoring or controllers that can sequentially change the current at each point, and other devices that can effectively compensate for parallel effects, the point spacing can be infinite. In the spot welding process, the gap between the two workpieces must be as small as possible, because eliminating the gap through pressure will consume part of the electrode pressure and reduce the actual welding pressure. The unevenness of the gap can cause fluctuations in the welding pressure, which can cause significant differences in the strength of each weld. Excessive clearance can also cause severe splashing. The allowable clearance value depends on the stiffness and thickness of the workpiece. The greater the stiffness and thickness, the smaller the allowable gap, generally 0.1-2mm. The strength of a spot welded joint is positive tensile strength under a tensile load perpendicular to the direction of the panel. Since the sharp corners between the two metal plates around the solder joint will cause stress concentration and reduce the actual strength of the solder joint, the solder joint is generally not loaded in this way. Usually, the ratio of positive tensile strength to shear strength is used as an index for judging joint ductility. The larger the ratio, the better the ductility of the node. The strength of a joint formed by multiple solder joints also depends on the spacing and distribution of the solder joints. When the pitch is small, the strength of the solder joints is affected by the shunting, while larger pitches limit the number of solder joints that can be placed. Therefore, greater joint strength can only be obtained by considering the distance of the solder joints and the number of solder joints. Multiple columns of solder joints should be staggered, not rectangular.

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Comparison of new cement pipe making technology and traditional technology

How is the cement pipe made?

Components of radial extrusion equipment

How the seam welder works

The working principle of seam welding machine

Introduction to Spot Welding Electromechanical Welding Operation

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