Useless driving prevention cushioning device for hydraulic pile driving hammer

Abstract

The invention discloses a useless driving prevention cushioning device for a hydraulic pile driving hammer. An integrated valve seat is fixedly arranged at the bottom end of a cylinder body of a hammer lifting oil cylinder, wherein a stopper piece and a guide sleeve are sequentially arranged on a piston rod in an inner cavity of the integrated valve seat from top to bottom in a sleeving manner; the guide sleeve is fixedly arranged at the bottom of the integrated valve seat, and an inner ring of the guide sleeve is in sliding fit with the piston rod; an outer ring and an inner ring of the stopper piece are in sliding fit with the inner wall of the integrated valve seat and the piston rod respectively. According to the device, back pressure is built up by a cushioning cavity between the stopper piece and the guide sleeve under the action of an overflow valve, and acts on the lower end face of the stopper piece to generate resistance to the downward movement of the stopper piece to stop the piston rod from moving downwards and absorb impact on equipment caused by the useless driving of hammerhead, so that the service life of the equipment is prolonged, and construction safety is ensured.

Description

technical field [0001] The invention relates to a hydraulic piling hammer anti-empty driving buffer system, which belongs to the field of piling machinery and is applied to the hammer lifting cylinder of the hydraulic piling hammer. Background technique [0002] The construction of pile driving hammer must adapt to various complex stratum conditions. During the process of pile settlement by hammering, if it encounters soft soil layer, or the soil layer at the bottom of the pile is suddenly hollow or the pile is suddenly broken, at this time due to the pile cap Suddenly lose the reaction force of the pile, the pile cap and the hammer pad fall to its lowest position, the hammer head cannot impact the hammer pad at the normal impact position, at this time, the hammer head continues to undershoot under the action of huge impact energy, causing the hammer head to impact the piling Other parts of the hammer will cause the piling hammer to self-destruct, and even cause accidents in...

AI Technical Summary

Problems solved by technology

[0002] The construction of pile driving hammer must adapt to various complex stratum conditions. During the process of pile settlement by hammering, if it encounters soft soil layer, or the soil layer at the bottom of the pile is suddenly hollow or the pile is suddenly broken, at this time due to the pile cap Suddenly lose the reaction force of the pile, the pile cap and the hammer pad fall to its lowest position, the hammer head cannot impact the hammer pad at the normal impact position, at this time, the hammer head continues to undershoot under the action of huge impact energy, causing the hammer head to impact the piling Other parts of the hammer will cause the piling hammer to self-destruct, and even cause accidents during the construction process

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