SU939178A2 - Percussive machine - Google Patents

Description

(54) SHOCK ACTION MACHINE

The invention relates to percussion machines and can be used in all cases when it is necessary to obtain powerful blows to an instrument with a relatively small stroke of the impactor, depending on the length of the latter.

According to the main auth. St. No. 799943 a percussion machine is known, comprising a cylindrical body, divided by buying with a hole, working tools and a stepped piston placed at its ends, a smaller step that is installed in the jumper hole, a hammer located in the central part of the body, alternately interacting with the tool and a lower piston step and an anterior chamber located in the housing and interconnected by channels, bounded by a drummer and a working tool, an average chamber limited by an area, a jumper second stage housing and at the piston rear chamber bounded by the end face and greater Kopaiyca stage piston and further chamber bounded by a bridge, the greater and lesser stages of the piston. Less piston stage and firing pin are made.

The chambers of the Elm grooves intermittently communicating with the source of compressed air respectively the front and rear chambers, and the casing in the zone of the additional chamber is made with bore holes that tentatively communicate the latter with the atmosphere 1.

The working scheme allows you to constructively machine with almost

10 by any necessary stroke of the striker, which leads to idle consumption of compressed air from the front chamber during the working stroke of the striker until the channel is closed, connecting the source

15 compressed air with a compression gauge through an annular drum driver, and also impairs the dynamic characteristics of the machine during the stroke of the drummer.

20

The aim of the invention is to reduce the consumption of compressed air.

This goal is achieved by the fact that. the machine is equipped with a hook that connects the front and rear chamber with

25 source of compressed air when switching drummer on the reverse stroke.

FIG. Figures 1-6 show the impact shockwave, a longitudinal section, a vertical position, with the working tool at the top;

in fig. 7 - the same, with the location of the working tool at the bottom.

The machine will be equipped with a cylindrical body 1, divided by a jumper 2 with an opening 3, placed at the ends of the housing 1 working tool 4 and a stepped piston having a lower level 5 and a larger level 6. A smaller piston level 5 is installed in the opening 3 of the jumper 2. The drummer 7 is located in the housing parts 1. In housing 1, channels 8-11, front 12, middle 13, rear 14, and an additional 15 chambers are formed and interconnected. Drummer 7 and a smaller level 5 pistons are made with annular grooves 16-18. In the additional chamber 15, the exhaust ports 19 and 20 are overlapped, which are blocked by a larger piston stage b as it moves. At the same time, the small piston stage 5 has an axial channel 21 with an opening 22.

The machine works as follows.

The vertical position of the machine with the location of the working tool BBenxv.

When the machine is connected to a source of compressed air (Fig. 1), the compressed air enters through the annular groove 18, the hole 22 and the axial channel 21 of the small piston level 5 into the middle chamber 13 and acts on the hammer 7 and the face area of the smaller piston stage 5. The drummer 7 is moved by the action of compressed air of the chamber 13, i.e. contemplated working course. At the end of the stroke of the hammer 7 and striking the tool 4, the piston moves to the position indicated in FIG. 3, since the annular groove 16 of the striker 7 connects the rear chamber 14 with channels 10 and 11 with a source of compressed air, and the chamber 15 is connected with openings 19 and 20 with the atmosphere.

When the piston moves, the holes 19 and 20 overlap with the larger piston level 6, the annular groove 17 of the smaller piston level 5 communicates the front chamber 12 with channels 9 and 11 with a source of compressed air, and the axial channel 21 of the small piston level 5 communicates the middle chamber 13 with the atmosphere, after which exhaust air from the middle chamber 13 is exhausted. Under the action of compressed air in the front chamber 12, the striker 7 reverses and, at the end of the stroke, acts on a smaller piston level 5, switches it to its original position. (After a slight movement from the place of the piston, the chamber 15 communicates with the channel 8 with the anterior chamber 12 and with the source of compressed air, which additionally entails switching the porins to the initial position by the pressure of air in the chamber 15). The complex effect on the piston of the energy of the moving hammer 7 and of the compressed air in chamber 15 on a large piston stage 6 allows the piston to be switched to its initial position, although at the moment shown in FIG. 6, the front chamber 12 and the chamber 15 are disconnected from the compressed air source .:

Such a solution to the issue of switching the stepped piston to its initial position provides not only a clear switching of the latter, but also helps to reduce the impact of the impactor 7 at the end of the return stroke on jumper 2 of housing 1. At the end of the stroke, the large piston level 6 opens the hole 20, after which the exhaust occurs exhaust air from chambers 12 and 15 to the atmosphere. The axial channel 21 of the small piston stage 5 by the hole 22 communicates the middle chamber 13 with a source of compressed air, after which the compressed air is introduced into the chamber 13. Under the pressure of the air in the middle chamber 13, the striker 7 makes a working stroke and, having overclocked, strikes the tool 4. In the following, the cycle repeats.

Vertical position with the location of the working tool at the bottom.

When the machine is connected to a source of compressed air (Fig. 7), the compressed air enters through channel 11, annular groove 16 of drummer 7, channel 10 into rear chamber 14 and channel 11, annular groove 17 of the lower piston level 5, channel 9 into the front chamber 12 The drummer 7 is under action (The compressed air by camera 12 moves, i.e., the return stroke is maintained. A further cycle of the machine operation proceeds as described above.

Horizontal arrangement of the car.

The working area of the end face of impact 7 in the front chamber 12 must be larger than the working area of the larger piston stage 6 in the rear chamber 14. This is necessary for normal operation over a given cycle. The width of the annular groove 16 of the striker 7, the grooves 17 and 18 of the lower piston stage 5, as well as the volume of the chamber 13 at the end of the return stroke of the striker 7 are chosen constructively to ensure the optimum cycle of the machine and maximize the impact of the striker 7 on the bridge 2 of housing 1.

It is advisable to use a percussion machine in those cases when it is necessary to obtain powerful tooling tools for the tool with relatively little impactor (hand-held chipping hammers, chisels, chisels, etc.).

contributes to increasing productivity and production culture by reducing the cycle of the operation.

Claims (1)

1. USSR author's certificate No. 799943, cl. B 25 D 9/00, 1979. FIG.