SU418308A1 - POWER HEAD - Google Patents

Description

one

FIELD: machine tool industry.

Known power heads with drives for rotating spindles, feeds and accelerated movements of quill, equipped with a mechanism for limiting its stroke.

The proposed head differs from the known ones in that the mechanism for limiting the quill stroke is placed in a groove made in quill, the nut of the limiting mechanism being guided by a strap fixed in the housing parallel to the axis of the screw.

This embodiment of the head will improve the processing accuracy and rigidity of the system.

FIG. 1 shows the proposed head, a longitudinal section; in fig. 2 is a section along A-A in FIG. one; in fig. 3 shows a section but BB in FIG. 2; in fig. 4 shows a section along BB in FIG. 2

The pinhole type power head consists of a spindle 1 mounted on bearings in quill 2, which is located in the sleeve 3 of the housing 4. In the housing 4 a vertical gearbox 5 of the main drive powered by the electric motor 6 is mounted.

The spindle 1 is connected to the gear 5 of the worm by a set hub 7, from which through the worm gear 8, the shafts 9-12, the worm gear 13, the shaft gear 14, the quill drive 2 is driven.

Shafts 9 and 10 are interconnected by interchangeable gear setting feeds (not shown in the drawings). A safety friction clutch is installed on the shaft 10 (not shown in the drawings), and on the shaft there is an 11 mechanism for turning on the supply of quill feed. A drive of accelerated quill movements is connected to the shaft 11 (an electric motor connected to the shaft 11 of a single-speed gear train, not shown in the drawings).

The quill-2 has a cut-out, and in the case there is a 4-groove, in which a stop nut 15 is installed, connected with a lead screw 16, fixed axially in the case 4. In the stop nut 15 there is a groove, into which the guide pad 17 enters. In it, the ruler 18 of the rough reference of the position of the stop nut 15 is flat, and the nonius nut 15 is of the nonius 19.

On the driving screw 16, the limb 20 of the exact reading of the position of the stop nut 15 is installed.

On the gear shaft 14, a drum 21 is mounted with annular stops 22, which controls the cycle of operation of the power head with the help of limit switches.

The head works as follows.

The spindle 1 receives rotation from the electric motor 6 through the gear 5.

When the cycle is turned on, the quill 2 rapidly accelerates the ejection from the accelerated movement mechanism, which interacts with the shaft 11, until the end switch actuates, controlled by one of the ring holes, 22. Then the feed activation mechanism on the shaft 11 connects the kinematically shafts 10 and 11, and the rotation is transmitted from screw casing 7 through a worm gear 8, shafts 9-12, a worm gear 13 on a gear shaft 14, moving the quill 2 with a given feed rate. In this case, the rotor of the engine of the accelerated movement mechanism of the quill, associated with the shaft 11, is slowly turned back.

At the end of the stroke of the quill 2, the end face G of the cutout in the quill rests on the end of the thrust nut 15, the quill 2 stops, the safety friction clutch on the shaft 10 slips, and then, with a time delay, the feed switching mechanism on the shaft 11 is disconnected, the shafts 10 and I, and by reversing the mechanism of accelerated movements associated with the shaft II, the quill 2 is accelerated to its initial position.

Adjusting the position of the stop nut 15 is made by rotating the spindle 16. At the same time, the position of the stop nut, therefore, the exact stroke size of the quill is determined by the ruler 18 with the nonius 19 and the limb 20.

Since the cutout in the quill 2 is located in the middle of the quill, between its supports in the sleeve 3, the bending moment arising from the stop of the butt G of the cutout of the knol 2 in the un-nut 15,

causes deformations of the front console of the quill 2. At the same time the knob of the quill 2 can be made of the minimum length, which increases the quality of the quill during processing.

The thrust nut 15 is guided in the horizontal plane by the groove in the housing 4, and in the vertical plane by the guide bar 17. Thus, the lead screw 16 is unloaded from the bending moment that occurs when the end face G of the quill 2 contacts the end face of the stop nut 15.

Subject invention

The pipol-type power head with spindle rotation drives, feeds and accelerated movements of quill, equipped with a mechanism for limiting its stroke in the form of a screw pair,

characterized in that, in order to increase the machining accuracy and rigidity of the system, the mechanism for limiting the quill stroke is placed in a groove made in quill, and its nut is guided by a strap fixed in the housing parallel to the axis of the screw. 2

Bb

FIG. five

P 1B 16B-B

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