SU747713A1 - Pneumatic tamper - Google Patents

Description

one

The invention relates to portable impact tools and can be used in the foundry industry for compacting molding sand during mold filling, as well as in construction for compacting concrete.

A percussion instrument is known that comprises a piston placed in a housing, a piston in which compressed air is supplied through the valve and air supply openings 1,

A disadvantage of the known device is low efficiency.

Also known is a pneumatic tamper, comprising a housing, a cylindrical barrel accommodated therein with an air supply of sch1 holes at the ends and exhaust openings in its central part, a piston mounted on the barrel with a rod, at the end of which a working tool is fixed, into a spool box fixed at the end of the barrel, opposite the working tool 2.

However, the known tamper has not enough good performance, namely, insufficient energy of a single blow.

with a small life span before the first repair, it has a continuous vibration; when the compressed air pressure drops below 5 kgf / cm, the rammer does not work.

The aim of the invention is to improve the performance of the tamper.

The goal is achieved by the fact that in the pneumatic tamping of the air supplying holes from the side of the slide valve box are located at a distance equal to 0.85-1 of the diameter of the piston, the air supplying holes from the side of the working tool are located from the end of the barrel at a distance equal to O , 55-0.70 piston diameter, and the exhaust ports of the barrel are located from the spool box at a distance of 3.0020 3.25 piston diameters.

FIG. I schematically shows the tamping, General view, figure 2 -

31; one;

in fig.

Section A-A in FIG.

4a to fig. Section bb in fig.

25

51; in fig. Section B-B in FIG.

61 in FIG. a section of YYY in FIG. 1. a section dd in fig.

The pneumatic rammer consists of 13 bodies 1 of a cylindrical barrel 2 placed in it, in which

a piston 3 is placed with a rod 4, a spool box 5. In the body of the spool box, there is a distribution chamber 6 where the spool 1 is located, connected to the compressed air line through a nozzle 8. In the cylinder there are air inlet holes upper 0.85-1 , 00 is the diameter of the piston from the spool box, the lower 10 are at a distance t of 0.550, 70 the diameter of the piston from the end 11 of the barrel on the side of the working tool, connected to the spool box through channels 12 and 13, respectively, as well as exhaust ports 14 m 3,003, 25 piston diameter from spool box. Channels 15 and 16 are made in the spool box.

Rammer works as follows.

Compressed air enters through distribution pipe 8 through distribution chamber 6. Air flows into distribution chamber through spool openings of spool box (for example, 15) and then through duct 13 and lower air inlet 10 into barrel 2, piston 3 under pressure. moves up. He makes a working move until the front end is. will open the exhaust port 14. At the same time, the compressed air freely escapes the 8 atmosphere. Under the action of inertia forces, the piston 3 moves by compressing the air cushion in the barrel 2, and then starts to move in the opposite direction due to the air impact of the air cushion. created at exhaust in channels 13 and 15, the spool opens channel 16, thus blocking channel 15, compressed air

enters through the channel 12 and the hole 9 in the barrel 2, moving the piston 3 forward until the rear end of the piston 3 opens the exhaust hole 14. When this happens, the exhaust occurs. Then the cycle of operation is repeated. The use of trap1.1bovki will allow to increase labor productivity at compaction of the molding earth in the foundry industry, as well as to increase vibration isolation.

Claims (1)

Invention Formula A pneumatic tamper, comprising a housing, a cylindrical barrel accommodated therein with air supplying openings at the ends and exhaust openings in its central part, a piston mounted in the barrel with a rod at the end of which a working tool is fixed, and a spool box mounted on the end of the barrel opposite to the working tool, characterized in that, in order to improve its performance, the air vent holes on the side of the slide valve box are located at a distance from it, paBlioM 0.85-1 diameter The piston ram, the air inlet holes on the side of the working tool are located from the end of the barrel at a distance equal to 0.55-0.70 in diameter of the piston, and the exhaust ports of the barrel are located from the spool box at a distance equal to 3.00-3.25 diameter piston Sources of information taken into account in the examination 1, USSR Copyright Certificate №97950, class, B 25 D 1/02, 1952, 2, Pneumatic Manual Machines Handbook, Mechanical Engineering, L ,, 1968, p. 247, fig. 116 {prototype). US.2 Fyo .. (Riga.Z YY fi & .5 ld ten 12 Phie. b