Connecting screwdriver is a device that screws the connector to the tubing body according to the standard when producing tubing or casing. It is mainly composed of the host responsible for tightening, the console for controlling and displaying data and the hydraulic station.


Classification by operation


Manual operation
Manual coupling screw machine is mainly used for repairing low efficiency single piece small batch production of oil casing.


Automatic operation
The automatic operation of the coupling screw machine is mainly used in the production line of tubing and casing. It can achieve high efficiency through manual coupling pre-tightening or coupling pre-twisting machine.


Classification by clamping method


Cylinder clamping
The clamping mechanism of the connecting screwdriver is a chuck, in which several cylinders are arranged in a ring shape, and the front end of the cylinder block is provided with teeth. The cylinder block extends synchronously during the clamping process. The clamping force is determined by the following type: cylinder pressure, when the cylinder is clamped on the tube body or coupling, another cylinder drives the chuck to rotate an angle, thus realizing the coupling. Tighten the shaft. Spiral machine is mainly used to repair downhole tools, drill pipe joints, oil jackets and so on. Because the chuck can not rotate continuously, it needs to work with the rotator, and the efficiency is very low.


Cam clamping
The clamping mechanism of the connecting screwdriver is composed of chucks with multiple cams. The chucks are driven by gears in the machine. When the cam rotates, the coupling or the pipe body is synchronously clamped to drive the coupling or the pipe. The main body rotates to tighten the connector, and the main power of the device is the liquid motor. This kind of tightening machine is an earlier kind of tightening machine. Because the contact between cam and coupling or tube body is linear contact, the indentation after clamping is very deep, and the deformation of coupling or tube body itself is very large. It is no longer suitable for modern special buckles. The advantage of this coupling screwdriver is that it does not need to change the cam in a certain range.


Seesaw clamping
The clamping mechanism of the coupling screw machine consists of a truss with three or four rafts. There is a roller at the rear of the raft. The roller rolls on the inclined surface of the gear in the equipment. At the same time, the roller climbs up the slope, and the clamp will be close to the center until the clamping coupling or pipe body is installed. Each claw is equipped with at least three or more rods, so that there are many contact points in the circumferential direction, which makes the tightly marked clamp greatly reduced. The main rotating power of the equipment is usually a liquid motor, and the clamping force of the back fixture is usually a hydraulic cylinder or cylinder. Because of the use of seesaw, each dimension of the tube must correspond to one type of jaw, which also leads to many types of fixtures. This thread processing machine is the mainstream thread processing machine, which is used more on the production line.