SU1760103A1 - Electric hammer drill - Google Patents

Abstract

Use: for the destruction of rocks and blasting of minerals. SUMMARY OF THE INVENTION: The hammer includes a housing with an electric motor, the output shaft of which is kinematically connected with a conversion mechanism placed in a crankcase spring-loaded relative to the housing. The converting mechanism is made in the form of flywheels with counterweights, placed oppositely on each other and symmetrical with respect to the longitudinal axis of the hammer shafts. Each of the flywheels has a toothed crown for interacting with the toothed crown of the adjacent flywheel, and a housing is fixed on the crankcase to interact with the working tool. The shafts lie in the same plane, perpendicular to the longitudinal axis of the hammer. 2 Il.

Description

The invention relates to the field of mining and construction, in particular in hand tools for the destruction of rocks.

The purpose of the invention is to reduce the longitudinal dimension and the metal while reducing energy performance.

Figure 1 - shows a longitudinal section of a hammer; 2 is a section A-A in FIG. one.

Electric hammer drill, includes a housing 1, on which is mounted an electric motor 2.

Inside the housing 1, on the straight-line guides 3, the crankcase 4 is movably mounted with a converting mechanism. A drummer 5 and a pusher 6 with a pawl (not shown) are mounted on the crankcase, and on case 1 a box 7 has a gear wheel - a ratchet 8 for interacting with the pusher pawl 6. The drummer 5 is installed to interact with the working tool

volume 9 (shoulder), which is fixed against twisting in the bush 7. The converting mechanism has three shafts, of which shaft 10 is located coaxially to the striker 5 and connected to the drive shaft 11 of the electric motor 2 by a splined coupling 12, which allows the transducer mechanism to move freely axial direction relative to shaft 11. The other two shafts 13 are arranged symmetrically and parallel to the longitudinal axis of the hammer on both sides relative to the shaft 10. On one of the shafts 13 there is a helical gear 14, which engages with the helical tooth oh gear 15, mounted on the shaft 10, i.e. the wheel 14 forms a gear pair with the gear 15 (this can be a conical or a worm pair). On each of the shafts 13 is also fixed on two flywheel 16, having counterweights. Makhosik 16, all, or at least two of the opposing |

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in the same plane, they have toothed rims for coupling the opposite flywheels to each other. The flywheels should have the same diameter and number of teeth on their rims, and the diameter of the initial circumference of the ring gear of each of the flywheels should be equal to the center distance of the parallel shafts 13. The crankcase 4 of the conversion mechanism is spring-loaded relative to the housing 1

Figure 1 shows two springs 18, but their actual number is not significant.

The device works as follows.

When the electric motor 2 is turned on, rotation from the shaft 11 through the splined coupling 12 is transmitted to the shaft 10 of the conversion mechanism. The gear 15 of the shaft 10 begins to rotate the gear wheel 14, and with it the shafts 13 and the flywheels 16 secured to them. Since the flywheels 16 are linked by each other by means of the gear rims, the rotation of the two shafts 13 and all four flywheels 16 will be synchronous and pairwise oncoming The counterweights 17 on the flywheels, rotating synchronously and towards, will balance each other in the horizontal direction, but will cause vertical peripheral oscillations of the crankcase 4. The drummer 5 will begin to apply periodic blows to the working tool (drill) 9. In order for the reciprocating movements of the working tool 9 made a rotation around its axis, it is placed in the box 7, which tells him this rotation, receiving it in turn from the dog pusher 6, acting on the ratchet wheel 8 s is stored in the device and if, instead of four flywheels 16

Only two opposite flywheels will be installed.

Then the horizontal inertia forces will also be balanced, and the vertical

will be somewhat shifted towards the hammer 5, which does not reflect the external effect of the hammer drill, but will cause an asymmetrical effect of the hammer on the hammer head and, accordingly,

asymmetry of loads on knots and details of the hammer.

The springs 18 serve to maintain the converting mechanism in the initial position and damp the return movement. With the help of springs it is also possible to regulate the magnitude of this damping.

Claims (1)

Invention Formula An electric drill hammer comprising a housing, an electric motor, kinematically connected to the drive shaft of an electric motor, a converter mechanism in the form of at least two flywheels fitted with counterweights, which are located on shafts in a housing that is spring-loaded relative to the housing and fixed to the crankcase a firing pin installed to interact with a working tool, characterized in that, in order to reduce the longitudinal dimension and metal content while maintaining energy handheld indicators, flywheels with a protector weights have gear rims to interact with each other and are mounted in a crankcase opposite on the shafts whose limiting axes are parallel to each other and are located in the same plane, the perpendicular the hammer's longitudinal axis, and symmetrically to the latter. ff-l / 7