SU582390A1 - Down-the-hole pneumatic percussive tool - Google Patents

Description

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The invention of the industry is in the field of industry, and in the case of submersible non-immobilizers for drilling wells.

A submersible impact hammer is known, comprising a cylinder with exhaust ports, a rear and front head, a piston, a tubular rod, and a tool that is associated with the front head by means of a key or spline joint 1.

However, this hammer has low operational reliability and durability.

The closest in technical dryness and the effect achieved is a submersible pneumatic hammer, including a piston separating the cylinder cavity into the working and idling chambers, exhaust windows, front and rear heads, a central tubular rod for supplying energy and a crown 2.

The disadvantage of this design of an impact hammer is that during its operation, when drilling cuttings get between the surfaces of the front head and the crown, the slotted or keyed connection of the front head with the crown, as well as when the latter is jammed, the piston collision of the crown collides. leads to the fact that the piston, having performed the working stroke from the extreme rear position under the action of the energy carrier entering the working stroke chamber, strikes the front head, which leads to Rushen hammer.

The aim of the invention is to increase the operational reliability and durability of the hammer, i.e., prevent the piston from giving the front head

change in the con tact of the impact of the piston on the crown.

For this purpose, a sleeve with o-rings is installed in the pneumatic impact cylinder, radial channels and an external annular groove are made in the front head, which, together with the inner surface of the cylinder and the sleeve, forms a buffer chamber.

The drawing shows a submerged pneumatic hammer, general view.

The pneumatic impact hammer includes a piston 1 with radial channels 2 and 3 and protrusions 4, which divide the cavity of cylinder 5 into chambers of working 6 and single 7 strokes,

exhaust ports 8, front head 9 with blocking holes 10 and rear head And, a central tubular rod 12 for supplying energy carrier with inlet holes 13 and a crown 14. A sleeve 15 with sealing rings is installed in the cylinder

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16. In the front head 9 there are radial channels 17 and an outer annular groove 18, which, together with the inner surface of the cylinder 5 and hub 15, forms a buffer chamber 19.

When the device operates through the inlet holes 13 of the tubular rod 12 and the channels 3, the energy carrier enters the working stroke chamber 6, and the working stroke of the piston 1 begins. As the piston moves under the influence of the energy carrier, the exhaust ports 8 open and the exhaust from the working stroke chamber 6 occurs. Piston 1 due to the acquired energy continues to move. When this energy through the inlet holes 13 of the tubular rod 12, the channels 2, the camera 7 idling and the radial channels 17 enters the annular groove 18, and part of the energy carrier through the locking holes 10 to purge. When combining the coordinates of the piston movement and the constructive coordinates of its impact on the crown 14, the piston -1 by the projections 4 moves the sleeve 15. This closes the radial channels 17 and a constant amount of energy carrier is cut off in the annular groove 18. As a result, an additional pneumatic buffer chamber 19 is formed which suppresses the accumulated energy of the piston, thereby preventing it from colliding with the front head 9. As a result, the operational reliability and durability of UHD pneumatic impact tool.

Claims (2)

1. USSR author's certificate No. 202831, cl. E 21C 3/24, 1966. 2. USSR author's certificate L 344IZ, cl. E 21C 3/24, 1971. 5 12 13 12 / I If  7h 7 7/7 /) E /