Coupling screwing machine

The coupling screwing machine is a device for screwing the coupling to the pipe body according to the standard when the oil pipe or casing is produced. It is mainly composed of a host responsible for screwing, a console for controlling and displaying data, and a hydraulic station.

Classified by operation

Manual operation
The manually operated coupling screwing machine is mainly used to repair single-piece small-volume production oil casings, which are less efficient.

Automatic operation
The automatic operation of the coupling screwing machine is mainly applied to the oil casing production line, and it can realize efficient production with the manual coupling pre-screwing or the coupling pre-twisting machine.

Classified by clamping method

Cylinder clamping
The clamping mechanism of the coupling screwing machine is a chuck with a plurality of cylinders arranged in a ring, the front end of the cylinder is provided with a tooth block, and the cylinders are synchronously extended during clamping, and the clamping force is determined by the cylinder pressure, when the cylinder is clamped after the pipe body or the coupling, the other cylinder pushes the chuck to rotate by an angle, thereby achieving the screwing of the coupling. The screwing machine is mainly used for repairing oilfield downhole tools, drill pipe joints, oil casings, etc. Since the chuck cannot be continuously rotated, it needs to work together with the spinner, so the efficiency is very low.

Cam clamping
The clamping mechanism of the coupling screwing machine is composed of a chuck equipped with a plurality of cams, and the chuck is driven by the gears inside the machine, and the coupling or the tube body is synchronously caught when the cam rotates, thereby driving the coupling or the tube. The body rotates to achieve the screwing of the coupling, and the main power of the device is the liquid motor. This kind of screwing machine is a kind of earlier screwing machine. Since the contact between the cam and the coupling or the pipe body is in line contact, the indentation after clamping is very deep, and the deformation of the coupling or the pipe body itself is also very large. It is no longer suitable for modern special buckles. The advantage of this type of coupling screwing machine is that it does not need to change the cam within a certain range.

Seesaw clamping
The clamping mechanism of the coupling screwing machine is composed of a truss frame with three or four rafts, and a roller is arranged at the rear of the raft, and the roller rolls on the ramp on the internal gear of the device, along with The roller climbs on the ramp, and the jaws will be close to the center until the clamping coupling or the pipe body is installed. Each of the jaws is equipped with at least three or more bars, so that there are many contact points in the circumferential direction, so that the clamps from tight marks are greatly reduced. The main rotating power of the equipment is generally a liquid motor, and the clamping power of the back clamp is generally a liquid cylinder or a cylinder. Due to the use of the seesaw form, each size of the tube must correspond to a type of jaw, which also results in many types of fixtures. This kind of screwing machine is a variety of mainstream screwing machines that are used more on the production line.