SU186336A1 - PILED HYDROMOLOT - Google Patents

Description

In the well-known pile hammer, including a housing, an impact part, a working cylinder with a piston, a spool valve, a drain and a pressure line, the switching valve is switched by means of a mechanical drive or electromagnets. The presence of a cam or lever system, as well as the need for power for electromagnets, complicates the design of such hydraulic hammers. In the on-site pile hammer, in order to automatically distribute the liquid during reversal, the piston is made with a channel in which a check valve is mounted that connects the lower cavity of the working cylinder to the drain line at the moment the piston is at the bottom dead center. The drawing shows a longitudinal section of the described hammer. It includes body 1, impact part 2, working cylinder 3 with piston 4, spool box 5 with distribution valve b, spring 7 and safety valve. Disc springs 9 are placed between the piston rod and the impact part, which eliminates the influence of the skewed shaft and impact part. and relieves dynamic loads on piston group parts. A channel 10 is formed in the piston, in which a reverse claian is mounted. Since the movement of the piston and, consequently, fluid flow, is uneven, a hydraulic accumulator 12 is inserted into the hydraulic system. The guide for the impact part is a housing made in the form of a pipe with openings (in the drawing not shown) at the bottom and top for air outlet. Hydraulic hammer works as follows. In the initial position, the piston and the shock part are in the lowest position, and the spool is in the extreme upper position under the action of the spring. The working fluid supplied by the pump 13 from the tank 14 through the valve enters the rod end of the working cylinder, and from the upper cavity goes along the drain line 15 back into the tank. The piston with the impact part rises and closes the vent hole, and the remaining part of the liquid displaces it into the cavity above the slide. The spool compresses the spring 7 and occupies the lowest position. The working fluid enters the upper cavity of the cylinder, and the piston accelerates downwards. The strike part strikes a strike (not shown). At the same time, the upper cavity of the working cylinder through the check valve 11 and the annular bore on the piston is connected to the drain line.

The pressure above the piston and over the valve pag, eta, and the spring 7 switches the valve to the upper position. Then the cycle repeats,

To avoid piston lag, the lower cavity of the cylinder should be open at any position of the spool. This is easily achieved by choosing the width of the workers for the spool valve.

Subject invention

Pile hydro hammer, including; case, impact part, working cylinder with piston.

spool distributor, drain and pressure line, characterized in that, in order to automatically distribute the liquid when reversing the movement of the piston in the working cylinder, a spring is installed under the distributor spool and the cavity above the spool is connected to the upper cavity of the working cylinder, and the piston is made, for example , with a channel in which a check valve is installed, connecting the lower cavity of the working cylinder to the drain line when the piston is in the bottom dead center.