SU861575A1 - Percussion-action hydraulic device - Google Patents

Description

(54) HYDRAULIC SHOCK ACTION

- one .

The invention relates to the mining industry and is intended for use in drilling machines of a rotary percussion action for underwater drilling. .

Known percussion devices include a hammer head located in the housing and connected to a differential plunger located in the working and idling chambers and telling the striker the required movement 1.

The closest to the proposed invention in its technical essence and the achieved result is a hydraulic percussion device, comprising a housing, a rotating control, a tool shank and a firing pin rigidly connected to the plunger, forming from the walls of the KctMH of the shell, through the backrush and downhole cavities, and connected to the drainage pipe, and the chamber working and idling 2.

However, this device does not provide operational reliability when working under water. This is due to the fact that during cocking and unwilling of the striker in the pre-cavity cavity between the striker and the shank and in the bottom of the cavity, a pony pressure zone is formed, where water penetrates, or a vacuum occurs, and the fluid flows out of the drainage system.

The purpose of the invention is to increase the operational reliability of the device when operating in the aquatic environment.

, e The goal is achieved by the fact that the pre-collars and the re-arresting cavities are constantly connected to each other by means of longitudinal grooves that are made on the surface of the striker.

Figure 1 shows the proposed

5 device, longitudinal section; FIG. 2 is the same, section A-A in FIG. The device comprises a housing 1 in which the head 2 is rigidly mounted, rigidly connected to the differential plunger 3, which is located in the hollow of the rotating control body 4 and divides this cavity into the chambers of the working 5 and idle 6 strokes.

, On the cylindrical surface of the striker

 2, longitudinal axes 7 are made which continuously communicate the pre-crushed 8 and the 9-cavity 9 cavities connected to the drainage pipe 10. In the front part of the housing 1 is installed

30 (Hvostovik tool 11.

The device works as follows.

In the platoon phase, the ababic cavity 9 decreases and the pre-tubular cavity 8 increases, and in the acceleration phase, the cavity 9 increases and the cavity 8 decreases. Due to the presence of grooves 7 on the surface of the striker 2 connecting cavities 8 and 9, the total volume of these cavities remains constant. There is no discharge or suction of fluid from the drain pipe.

The use of a new element of the grooves on the cylindrical surface of the striker favorably distinguishes the proposed hydraulic device, a percussion effect from the indicated prototype, since a closed volume of air is created in the housing, in which the spacer is located. As a result, there will be no penetration of water into the pre-striker and downhole cavities of the striker and suction of fluid from the drainage system, which will increase the scope of application of the hydraulic device of the striker.

Claims (2)

1. Author's certificate of the USSR 231478, cl. E 21 C 3/20, 1966. 2. Authors certificate of the USSR 615204, cl. E 21 C 3/20, 1976 (prototype). il Phag: 2