SU810473A1 - Pneumatic impact nut-driver - Google Patents

Description

a triangular surface and a hexagonal outer surface on which the leading part is mounted; 7 of the striker, having an internal niggle-shaped surface and connected to disk 6 by means of 1THE TIFTS 8 to prevent axial movement of the leading part 7 of the striker and disk 6.

In the driving part 7 of the impactor, there is a set of driven part 9 with working cams 10, having an external hexagonal surface for rotation together with the driving part 7 and axial displacement relative to it (see Figs. 1, 2, 4).

The anvil 1.1 is rotatably mounted in the sleeve 12 of the housing /, rigidly fixed to the spindle 13 and has working cams 14. The second end of the shaft of the intermediate 2 is centered in the axial bore of the spindle J3.

The undercarriage part 9 of the impactor has beveled surfaces 15 (see Fig. 1), and t, the claim 6 has lines 16. Between the beveled surfaces 15 and the projections 16 are placed centrifugal weights 17, in the form of balls.

Shaft 2 can rotate in conjunction with disc 6 due to the landing but triangular surface and has the possibility of axial displacement. The intermediate shaft 2 is spring-loaded relative to the anvil 11 with a power spring /: 5. In the radial extrusion groove 19 of the shaft 2, the radially mounted spring-set supports 20 have bevels 21 facing the anvil. Uiora 20 have flats on which they are ornated and kept from falling out by the ring 22, and they are oriented relative to the working jaws 10 of the striker. The working cams 14 of the anvil 11 have bevels 23 interacting with the bevels of 21 stops 20. A return spring 24 is installed between the stops 20 and the driven part .9 of the striker.

Impact wrench works as follows. A spindle key (not shown in the drawings) is put on the spindle 13 and its threaded connection is installed (not shown in the drawings). After switching on the engine 5, the impact acceleration takes place, and the rotation from the shaft 4 is transmitted to the disk 6, and from there to the leading part 7 of the striker, the driven part 9 and the intermediate shaft 2. As the rotational speed of the striker increases, the balls 17 move under the action of centrifugal force from the center to the periphery and affect the surface / 5 of the driven part 9 of the striker, moving the latter in the axial direction towards the anvil 11.

During axial movement of the driven part 9 of the striker, the intermediate shaft 2 also moves, compressing the power spring tS, while 20 do not allow the working cams 10 of the striker to engage with

with the cams 14 of the anvil 11, while the bevels of the 21 Uior 20 are not in contact with the bevels of the 23 working cams 14 and the incline / V. As a result, the interaction bevels 21 and 23

the stops 20 release the driven part 9 of the impact unit for further movement in the direction of the anvil 11 in a moment when the workers cams 10 of the striker rationalize against the working cams 14 of the anvil, with

This is the return spring 24, and a shock occurs in which the kinetic energy accumulated by the impactor is transmitted through the spindle to the tightened threaded joint.

At the moment of impact, the speed of the impactor reaches Iul and the balls 17 return from the periphery to the center, the spring 24 removes the first part 9 of the striker from the anvil, 1 output the working cams 10 of the impactor from the deflection with the working cams 14 of the anvil 11, and the spring dorsal stops return to their original position the cams 10 of the striker and the shaft 2 is pressed by the spring 18.

After this, the described cycle is repeated (with the engine on) until the necessary energy is supplied to the threaded connection for its completion. Since the impact wrench operates with a large frequency of impacts, counting the required number of impacts is not difficult.

By placing the spring-loaded stops in the intermediate shaft, the stability of the impact energy is ensured and the reliability of the impact mechanism of the wrench is increased, and the axial dimension of the wrench is reduced, which significantly reduces its operational capabilities.

Claims (2)

Invention Formula A pneumatic impact wrench, comprising a housing, a drive shaft housed therein, a drummer as a leading part and a driven part housed therein with working cams, a spindle with an anvil rigidly fixed on it, having reciprocal cams, centrifugal weights placed between the driving and driven parts of the striker, spring-loaded stops, oriented relative to the working cams of the driven part of the striker, and power and return springs, which are designed to increase i: reliability and stability However, it is provided with yciaiovlennymi in the leading part of the drummer with the possibility of joint rotation and relative axial non-displacement of the intermediate shaft with a diametral end-to-end, in which podraschennye stops, interacting with the cam and anvil and driven part udarkika, the return spring is located between .du stops and driven part of the hammer, and power - between the intermediate shaft and the anvil. I Sources of information taken during the examination: 1. Hechtman E. Mechanization of manual work abroad. Riga, Liesma, 1969, p. .118. 2. USSR author's certificate in application number 1944661, cl. B 25 B 21/02, 1974 (prototype). iO