Hydraulic hammer

Abstract

A hydraulic hammer, comprising a housing (2); an impact mass (3) equipped with a guide rod (4) reciprocatingly moving; a hydraulic cylinder (6) for moving the impact mass (3), which is fixed on the housing ( In 2), the piston (7) with the connecting rod (8) forms a connecting rod cavity (9) in the direction of the pile (1) in the hydraulic cylinder (6), and the other side forms a piston cavity (10). The connecting rod (8) is connected with the impact mass (3), the pump (11) with the overflow pipe (13) and the pressurizing pipe (12) which is connected with the connecting rod cavity ( 9) are connected, and also include two double-position valves (14, 15), which are used to connect with the piston chamber (10) of the hydraulic hammer (6) through the pressurizing pipe (12) or overflow pipe (13); each Valve parts (17, 26) are made into an oil cylinder form, arranged and sealed in the housing of the valve, and its outer diameter is close to the diameter of the contact surface of the valve. Wherein the chamber at the front end of the valve part communicates with the chamber at the rear end of the valve part facing the valve seat.

Description

technical field [0001] This invention relates to construction machinery for driving piles, sheet piles, pipes and other construction components into soil. Background technique [0002] ΦPΓ N2900221 in the patent, discloses a kind of hydraulic device for piling in EO2D7 / 10. It consists of a housing; an impact mass connected to the housing; a hydraulic cylinder with a power piston whose connecting rod is connected to the impact mass; a hydraulic distributor arranged in the hydraulic cylinder and having a slider, which includes a plunger oil valve , this valve interacts with the face of the power piston. The plunger oil valve forms a closed container (control cylinder) connected to an accumulator in which a piston is arranged, the stroke of which is limited by a brake. The control cylinder is connected with the drainage equipment through the safety valve. [0003] This device has a strong working capacity and has been implemented in practice, but it has two disadvantages, na...

AI Technical Summary

Problems solved by technology

[0005] The main disadvantage of this device is: idling, that is, at the end of the upward movement of the piston and impact mass, the action of the closed valve is unreliable

[0006] Not only the relevant calculations of the working process have confirmed the above-mentioned shortcomings of this device, but also our own tests have confirmed the above-mentioned shortcomings: when we process the hammer, we first use the similar valves mentioned, because the difference between the piston and the impact mass in the upward state cannot be effectively eliminated. Hovering so often we had to give up doing this

Because the pressure that accelerates the valve has an effect on a large area, in order to effectively suppress it, there must be a hydraulic brake device with a working chamber whose diameter can be equivalent to the diameter of the valve seat, which makes the structure more complicated

Images