RU1785885C - Device for fastening working tool to shaft of shocking mashine - Google Patents

Abstract

Using; in mechanical engineering for fastening a working tool. SUMMARY OF THE INVENTION: the device comprises a stopper and a casing with two central holes, the first for interacting with the barrel, and the second for accommodating the working tool and the support surface located between the holes associated with the stopper, and an elastic element, the first hole is made stepwise. a groove is made on the surface of the stopper from the casing side, the latter forms a cavity with the casing step, and the elastic element is installed in it, the stopper is made in the form of a collet, and the elastic element in the form of a ring. 1 ill.

Description

FIELD OF THE INVENTION This invention relates to manual impact machines used in various branches of the national economy, mining, construction, mechanical engineering, etc.

A device for fastening a working tool with a shank and a shoulder to the barrel of a percussion machine is known, comprising a casing with a protrusion for interacting with the working tool and a split spring ring with a rigidly attached rod retainer located on the casing. The device has a threaded connection for screwing onto the barrel of the percussion mechanism / During operation, the cutting tool is threaded through the casing, after which the casing is screwed onto the barrel of the percussion mechanism and secured by a spring ring. The thrust protrusion of the casing interacting with the flange protects against ejection of the working tool during an idle stroke.

The disadvantage of this device: it does not provide fastening of the working tool, the diameter of the flange of which is less than the diameter of the hole formed by the protrusion of the casing. Another drawback: when the interacting surfaces are conical, it is possible to jam the working tool with a shoulder in the hole formed by the protrusion of the casing.

The closest technical solution to the proposed one is a device for fastening a working tool having a shank with a recess adopted for a prototype, comprising a housing, an elastic element with which a stopper is mounted on the housing, and a housing coaxially mounted with the housing. In order to improve the reliability of fastening by eliminating zakipi. The stopper is equipped with a torsion spring installed between the housing and the casing and the ends fixed on them with ends; in the housing diametrically arranged relative to each other

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through grooves intended to accommodate the stopper, protrusions are arranged diametrically relative to each other in the casing, designed to interact with the stopper made in the form of segmented-prismatic dowels, a curved surface interacting with the protrusion, and an opposite flat recess.

In fact, the device in question contains a casing with a protrusion, an elastic element, as well as a stopper interacting with a curved surface. with you. pom casing. :

Disadvantages of devices: a: in comparison with the previous one, it is more difficult to manufacture due to the large number of parts (sleeve, stoppers, springs, etc.); reduced operational durability and operational reliability due to the destruction of the elastic element (spring) and jamming of the stopper in the grooves, the casing from the direct impact of the shoulder of the recess of the working tool shank. . ..: ... ...;

Thus, in the field of pneumatic impact machines, there is a problem of a device for fastening a working tool, which would prevent jamming of the stoppers by a casing and associated with it. this is the unreliability of the device.

The purpose of the invention is to increase reliability in operation by eliminating jamming of the stopper with a casing, .. ..

This is achieved by the fact that in the proposed device for attaching a working tool with a shank and a recess to the barrel of the percussion machine, comprising a casing coaxially placed stopper casing with two central holes, the first to interact with the barrel, and the second to accommodate the working tool, and located between the holes of the supporting surface associated with the stopper, and the elastic element, the first hole is made stepwise, on the surface of the stopper from the side of the housing there is a groove formed with the step of the casing along spine, wherein the resilient member is mounted. :

In this embodiment, the elastic element acts on the shoulder of the stopper, attracts the latter from the hole and thereby prevents jamming of the stopper by the casing /

Another object of the invention is to simplify the assembly of a device. , -....

This is achieved by the fact that the elastic element is made in the shape of a ring of an elastic material, for example rubber.

In this case, the assembly of the device is reduced to the manual installation of the resilient element and stopper in the cavity of the casing and

this does not require the use of specialized tools and tools (conductors, keys, etc.).

The listed distinctive signs 5 are interrelated, and in combination with other features of the device. Ensure the achievement of the stated goal and a new positive effect, are new in the technique and field of impact machines 10 and therefore meet the criterion of significant differences. In the drawing schematically shows the proposed device, a longitudinal section. -. ...: .. 15 A device for fastening a working tool with a shank and a recess to the barrel of a percussion machine contains a metal (steel) casing 1 with a 2-inch protrusion, an annular flange, an elastic element 3 and a stopper 4 placed in the cavity of the casing. interacting with its outer curvilinear surface with the protrusion 2 and preventing the ejection of the working tool with a single impact on it with a shock 5 machine. The stopper 4 is made in the form of a collet. .

A threaded connection 5 is provided for securing and fixing the housing T at the .- free end of the barrel b of the impact machine 0 (air hammer).

.In order to increase the reliability of the device in operation by eliminating jamming: -stop 4 with casing 1, stopper 4 on the sides. The free end is made with an annular 5 outer protrusion 7, forming a closed (closed) cavity with the casing for accommodating the cylindrical elastic element 3c with the possibility interacting with one end with the protrusion 7 of the stopper 4, and 0 with the other with the protrusion 2 of the casing 1.

To simplify the assembly of the device, its elastic element 3 is made in the form of a ring: from an elastic material, for example rubber, which also contributes to damping the vibrations 45 arising when the working tool strikes the protrusion 2 of the casing 1.

The device operates as follows. ". . . . /.

When assembling., An elastic element 3 is first inserted into the cavity of the casing 1, then the stopper 4, after which the casing 1 is screwed and screwed onto the free end of the barrel b of the impact machine. The device is ready to go. 55 The fixed working tool 8 (chisel, peak, etc.) through the axial hole. the casing 1 is inserted by the shank into the axle box of the percussion machine. Then the casing is manually turned around, rotated around the axis, screwed onto the barrel 6. The stop 4 compressed by the shoulder 2 enters

in the undercut of the working tool and secures the latter from ejection.

When idle, the protrusion 2 of the casing 1 perceives shock loads by the shoulder of the recess of the tool 8 and excludes the ejection of the latter out of the device. The vibrations arising from such an impact are partially damped by the compressed elastic element 3.

To replace a worn tool 8, the casing 1 is rotated in the opposite direction. Under the action of the elastic forces of the compressed spring, the compressed elastic element 3, the latter acts on the protrusion 7 and removes the stopper 4 from engagement with the protrusion 2 of the casing 1. Then, the worn working tool is removed and replaced with a new one, after which the already known fixing is repeated.

In comparison with the prototype and other analogues, the proposed device provides the following advantages:

1) prevents jamming of the stopper 4 by the casing 1 and associated with. this is the unreliability of the device, since during its operation the elastic element 3 acts on the protrusion 7 removes the stopper 4 from the hole of the protrusion 2 of the casing 1 without the use of additional means;

2) the assembly of the device is simplified, which reduces to the installation in the cavity of the casing 1 of two axial nozzles of simple shape and design — a cylindrical stopper 4 and a cylindrical elastic element 3;

3) it has wider technological; opportunities because upon removal, the stopper 4 becomes suitable for fastening the working tool with the shank

and protrusion. In this case, the working tool. depending on the magnitude of the diameter of the protrusion during idle shock interacts with the protrusion 2 of the casing 1 or with an elastic element 3.

Claims (3)

1. Device for fastening a working tool having a shank c. recess, to the barrel of the percussion machine, containing a coaxially placed stopper and a casing with two central holes, the first to interact with the barrel, and the second to accommodate the working tool and the supporting surface located between the holes, connected with the stopper, and an elastic element, characterized in that, in order to increase reliability by eliminating jamming of the stopper, the first hole is made stepwise, a groove is made on the surface of the stopper from the side of the casing, the latter forms a cavity with the step, the casing, and the elastic element is installed therein. 2. The device according to claim 1. characterized in that the stopper is made in the form of a collet, and the supporting surface of the casing and the end face of the collet are conical. 3. The device according to claim 1, with the exception that, in order to simplify assembly, the elastic element is made in the form of a ring.