2results about How to "No external force" patented technology

The utility model relates to oilfield equipment field discloses a hydraulic tong of can be on and off oil pipe and pumping rod, including main tong, back tong, hydraulic tong installation frame, main tong left lifting hydraulic cylinder, main tong right lifting hydraulic cylinder, main tong left guide buffer subassembly, main tong right guide buffer subassembly and main tong suspension crossbeam, hydraulic tong installation frame is equipped with fixed part, main tong left guide buffer subassembly includes left guide bar and left spring, main tong right guide buffer subassembly includes right guide bar and right spring, main tong is hoisted in the middle part of main tong suspension crossbeam through support, the piston rod end of main tong left lifting hydraulic cylinder is connected left guide bar through left transverse plate, the piston rod end of main tong right lifting hydraulic cylinder is connected right guide bar through right transverse plate, the utility model discloses reasonable structure layout makes hydraulic tong to satisfy oil pipe on and off buckle operation and can realize pumping rod on and off buckle operation, automatic switching, guarantee good security and stability simultaneously.

This invention belongs to the field of flowmeter verification and calibration technology, and particularly relates to a high-precision and rapid transfer method for weighing containers during flowmeter verification and calibration. Its key feature is that, during the weighing process of flowmeter verification, after the weighing container is moved and returned to its original position, the repositioning accuracy of the weighing container on the electronic scale is controlled to be less than 1 mm. The specific operation steps are as follows: 1) Preparation stage; 2) Lifting; 3) Transfer; 4) Weighing; 5) Reset; 6) Equipment restoration, the equipment returns to the verification and calibration state. Compared with the prior art, the beneficial effects of this invention are: during the flowmeter verification and calibration process, without the aid of cranes or forklifts, the weighing container can be quickly and accurately transferred to a reasonable position; during the transfer process, the weighing container can maintain precise positioning at all times; and after the electronic scale is reset, the weighing container can be quickly placed back on the electronic scale, while reducing collisions and impacts on the electronic scale.