Hydraulic tensioner of fixed-torque locking prestressed anchor

Abstract

The invention relates to the field of hydraulic tensioners, in particular to a hydraulic tensioner of a fixed-torque locking prestressed anchor rod, comprising a cylinder body, a piston and a planetary wheel train. One end of the cylinder body is connected with the cylinder head, one end of the piston is arranged in the cylinder body, the other end of the piston penetrates through a waist-shaped through hole arranged on the cylinder head and is connected with the planetary wheel train, the piston is internally provided with a piston offsetting spring, the middle of the cylinder head is radially provided with a plurality of clamping blocks, clamping block switching rings are respectively arranged at the other sides of the plurality of clamping blocks, a clutch inner ring is arranged outside the planetary wheel train, a gear ring is arranged at the inner side of the clutch inner ring and engaged with a planetary wheel of the planetary wheel train, a clutch outer ring is sleeved on the outside planetary wheel train through a clip spring, a force arm is arranged in the direction where the circular lateral edge of the clutch outer ring is perpendicular to the axis of the piston, a catch pawl is mounted in the inner through hole of the force arm, one end of the catch pawl is engaged with a tooth socket at the outer side of the clutch inner ring, and the other end of the catch pawl is connected with a torque adjusting screw. The invention can improve the working efficiency and quantify the consistency of the prestressed anchor rod.

Description

technical field [0001] The invention relates to the technical field of hydraulic tensioners, in particular to a hydraulic tensioner for locking prestressed bolts with constant torque. Background technique [0002] When using high-strength prestressed anchors for roadway support, in order to obtain greater prestress, a larger tightening torque must be applied to the fastening nut at the end of the anchor. At present, when applying a large torque, a power torque wrench or Hydraulic wrench, due to the existence of the helix angle of the thread and the friction resistance between the thread pairs, when the torque is applied to the fastening nut at the end of the anchor rod, a part of the torque will be transmitted to the anchoring section of the anchor rod, so that the anchor rod body is subjected to tension and torsion. The combined effect of the torsion force on the anchor rod reduces the tensile resistance of the anchor rod, which has a great negative impact on the applicatio...

AI Technical Summary

Problems solved by technology

The magnitude of the torque applied to the nut of the tail thread pair will affect the final prestress maintained by the anchor rod. There are many shortcomings in the current hydraulic tensioner: 1. The use of a hollow cylinder increases the tension of the tensioner invisibly. Weight; 2. It does not have the function of quick clamping; 3. It cannot accurately and effectively ensure the consistency of the locking torque, resulting in the different prestress of each anchor rod, which directly affects the support effect and reduces work efficiency.

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