The "Hualong One" integral full-synchronous bolt tensioning machine is mainly used for opening and closing the pressure vessel of the "Hualong One" reactor. It is a large-scale on-site automated heavy-load robot that integrates mechanical, electrical, hydraulic, pneumatic and optical systems. Its main functions include: synchronously tensioning 60 main bolts to the preset value; automatic horizontal adjustment function; fully automatic centering adjustment function; fully automatic synchronous measurement of the elongation of 60 main bolts; fully automatic tightening and loosening of the main nuts; smoothly inserting and withdrawing the main bolts, and automatically balancing the weight of the bolts; after the main bolts are tightened, locking the main bolts to allow the main bolts, nuts and washers to be transported together with the bolt tensioning machine to the safety shell's external cleaning and temporary storage position or performing the opposite operation. It does not require workers to enter the reactor pit for operation. Through program control, all the work of installing and dismantling the main bolts can be realized. It can complete the pre-tightening of the main bolts in a short time, thereby greatly improving work efficiency, shortening the major repair period, and reducing the radiation dose received by the workers. 

Product features

1.1 The three-level tandem cylinder hydraulic stretching unit effectively addresses the issue of extremely high output in situations where space is limited and volume is restricted. 

1.2 The automatic leveling adjustment device can achieve automatic and rapid leveling adjustment, reducing the operation time of the critical path, and lowering the labor intensity of the operators and the radiation dose received by the operators. 

1.3 The automatic centering device has high centering accuracy and efficiency, high reliability, and high automation level. It reduces the operation time of the critical path, lowers the labor intensity of the operators and the radiation dose received by the operators. 

1.4 The bolt-rotating robot adopts a multi-sensor redundant design, with high axial force control accuracy, which significantly enhances the system's reliability and reduces the risk of thread damage. 

The real-time data acquisition and processing system for the insertion/withdrawal of the main bolt enables fault prediction (to stop the operation in advance and prevent the occurrence of faults), fault diagnosis (to determine whether it is an alignment problem or foreign matter entering the thread, etc.), and fault recording (probability of fault occurrence, direction for improvement), significantly enhancing the working safety and reliability of the integral fully-synchronized bolt tensioning machine. 

Technical Specifications 

2.1 Power Supply: 380V 3-phase/AC/50Hz/85A 

2.2 Diameter of the bolt distribution circle: 4750mm 

2.3 Number of Bolts: 60 

2.4 Maximum designed tensile force: 494,214 KN 

2.5 Normal insertion/rotation torque: ≤ 100 Nm 

2.6 Maximum Torque Limit: 150 Nm 

2.7 Rotation speed: 3 - 28 r/min 

2.8 Force exerted by the main bolt on the threaded hole during engagement: ≤ 50N 

2.9 Force exerted by the main bolt on the threaded hole after the fastening: ≤ 150N 

2.10 Maximum Design Working Pressure: 180 MPa 

2.11 Length: 24mm 

2.12 Maximum overall dimensions: φ6800 × 4020 mm 

2.13 Weight: 26.77 tons