CN215805890U - Main shaft brake mechanism - Google Patents

Abstract

The utility model relates to a main shaft braking mechanism which comprises a main shaft and a main shaft box body, wherein the main shaft is arranged in the main shaft box body, a braking base is further arranged in the main shaft box body, a main shaft braking ring is fixedly sleeved on the main shaft and positioned on the braking base, two eccentric braking wheels are further arranged on the braking base and respectively positioned on two sides of the main shaft braking ring, and the eccentric braking wheels on the two sides are respectively pushed to rotate through corresponding boosting mechanisms to press the main shaft braking ring, so that the main shaft can be braked. Has the advantages that: the structure is simple, the manufacturing cost is low, the precision is high, the installation is convenient, the braking effect is excellent, the braking force is symmetrical and stable, the unilateral force is not formed on the main shaft bearing, and the precision of the main shaft of the equipment is kept for a long time.

Description

Main shaft brake mechanism

Technical Field

The utility model relates to the technical field of mechanical part machining equipment, in particular to a main shaft braking mechanism.

Background

The main shaft is a core part of a numerical control machine tool, and the key of the machining precision is determined when the main shaft rotates and stops. After a spindle motor stops working, the spindle cannot stop rotating in time due to inertia, on one hand, a machined workpiece cannot stop rotating immediately due to motor outage, on the other hand, quick tool replacement of a machine tool is influenced, and stability of the machine tool is influenced to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems and provides the double-eccentric braking main shaft braking mechanism which is simple in structure, convenient to operate and excellent in braking effect.

Technical scheme as follows, a main shaft arrestment mechanism, including main shaft and main shaft box, the main shaft sets up in the main shaft box, its characterized in that still be equipped with the braking base in the main shaft box fixed cover is equipped with main shaft braking ring on the main shaft, and main shaft braking ring is located on the braking base still be equipped with two eccentric braked wheels on the braking base, two eccentric braked wheels are located respectively the both sides of main shaft braking ring, both sides eccentric braked wheels push to rotate through the boosting mechanism that corresponds respectively and go to suppress main shaft braking ring makes the main shaft can brake.

As a further improvement, the eccentric brake wheel is installed on the brake base through an eccentric brake wheel installation seat, a deep groove and a shallow groove are arranged on two sides of the eccentric brake wheel installation seat in a back direction, the eccentric brake wheel is installed in the deep groove through an eccentric brake wheel mandrel, an inclined wedge block is arranged in the shallow groove, the concave surface of the shallow groove is an inclined surface and is attached to the inclined surface of the inclined wedge block, and the boosting mechanism is connected with the inclined wedge block.

As a further improvement, the boosting mechanism is an air cylinder.

As a further improvement, the inclination of the concave surface of the shallow groove is 5 °, and the inclination of the inclined surface of the inclined wedge block is also 5 °.

As a further improvement, a reset pin is further arranged on the side surface of the eccentric brake wheel mounting seat, a reset spring is further arranged in the brake base, and the front end of the reset spring abuts against the lower part of the reset pin.

As a further improvement, the surface of the eccentric braking wheel is coated with a wear-resistant brake pad.

As a further improvement, two mounting flat keys are respectively arranged on the spindle at two sides for mounting the spindle brake ring, two flat key grooves are respectively arranged on two sides of the inner surface of the spindle brake ring, and the mounting flat keys are inserted into the flat key grooves, so that the spindle brake ring and the spindle are fixed.

Advantageous effects

The beneficial effects are that: the structure is simple, the manufacturing cost is low, the precision is high, the installation is convenient, the braking effect is excellent, the braking force is symmetrical and stable, the unilateral force is not formed on the main shaft bearing, and the precision of the main shaft of the equipment is kept for a long time.

Drawings

The utility model is further explained with the embodiment in the following.

FIG. 1 is an exploded view of the present invention;

FIG. 2 is a top view of the mounting structure of the present invention;

FIG. 3 is a cross-sectional view taken along line D-D of FIG. 2

Fig. 4 is an enlarged view of section F-F of fig. 2.

Reference numbers in the figures:

1. main shaft 101, installation flat key

2. Spindle case 3, brake base

4. Spindle brake ring 401, flat key groove

5. Eccentric brake wheel 6 and boosting mechanism

7. Eccentric brake wheel mounting seat 701 and deep groove

702. Shallow groove 8, eccentric braked wheel dabber

9. Oblique wedge block 10 and reset pin

11. Reset spring 12, cover plate

Detailed Description

So that the manner in which the above recited features of the present invention can be understood and readily understood, a more particular description of the utility model, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings, wherein:

as shown in fig. 1-4, a spindle brake mechanism includes a spindle 1 and a spindle box 2, the spindle 1 is disposed in the spindle box 1, a brake base 3 is further disposed in the spindle box 1, a spindle brake ring 4 is fixedly sleeved on the spindle 1, the spindle brake ring 4 is disposed on the brake base 3, two eccentric brake wheels 5 are further disposed on the brake base 3, the two eccentric brake wheels 5 are respectively disposed on two sides of the spindle brake ring 4, and the eccentric brake wheels 5 on the two sides are respectively pushed by corresponding boosting mechanisms 6 to rotate to press the spindle brake ring 4, so that the spindle 1 is braked.

Specifically, the eccentric brake wheel 5 is installed on the brake base 3 through an eccentric brake wheel installation seat 7, a deep groove 701 and a shallow groove 702 are arranged on two sides of the eccentric wheel installation seat 7 in a back direction, the eccentric brake wheel 5 is installed in the deep groove 701 through an eccentric brake wheel mandrel 8, an inclined wedge block 9 is arranged in the shallow groove 702, the concave surface of the shallow groove 9 is an inclined surface and is attached to the inclined surface of the inclined wedge block 9, and the boosting mechanism 6 is connected with the inclined wedge block 9. The boosting mechanism 6 is generally a cylinder, and is practical, convenient and low in cost. Preferably, the inclination of the concave surface of the shallow groove 702 is 5 degrees, the inclination of the inclined surface of the inclined wedge block 9 is 5 degrees, the force increasing effect is achieved through the inclined wedge block of 5 degrees, and meanwhile, the main shaft braked under the condition that the original braking force is lost is not prone to failure. The eccentric distance of the eccentric brake wheel 5 is 2mm, the air cylinder pushes the inclined wedge block to move upwards to enable the eccentric brake wheel 5 to rotate, and when the eccentric brake wheel 5 rotates for half a circle, the eccentric brake wheel and the main shaft brake ring 4 are in the state of being pressed most tightly. A return pin 10 is further provided on the side surface of the eccentric brake wheel mounting base 7, a return spring 11 is further provided in the brake base 3, and the front end of the return spring 11 abuts against the lower portion of the return pin 10. The wear-resistant brake pad is coated on the surface of the eccentric brake wheel 5, so that the service life of the mechanism is prolonged.

The two sides of the main shaft 1, which are used for installing the main shaft brake ring 4, are respectively provided with an installation flat key 101, the two sides of the inner surface of the main shaft brake ring 4 are respectively provided with a flat key groove 401, and the installation flat keys 101 are inserted into the flat key grooves 401, so that the main shaft brake ring 4 and the main shaft 1 can be fixed, the fixing effect is good, and the assembly is rapid.

Two cover plates 12 are covered on the brake base 3 through mounting screws for protecting the eccentric brake wheel 5.

The working principle of the utility model is as follows:

and simultaneously starting the two cylinders to enable the two cylinders to respectively push the corresponding inclined wedge blocks 9 to move upwards for a distance, and the inclined planes of the inclined wedge blocks 9 are consistent with the inclined planes in the shallow grooves of the eccentric brake wheel mounting seats 7 in inclination, so that the eccentric brake wheel mounting seats 7 are pushed to move forwards for a corresponding distance by the movement of the inclined wedge blocks 9 until the eccentric brake wheels 5 are pressed on the periphery of the main shaft brake ring 4, at the moment, the main shaft 1 in a rotating state drives the main shaft brake ring 4 to rotate, the eccentric brake wheels 5 pressed on two sides of the main shaft brake ring 4 also rotate along with the main shaft brake ring 4, and the eccentric brake wheels 5 have 20mm eccentricity, so that when the eccentric brake wheels 5 rotate to half a circle, the eccentric brake wheels are in a state of being pressed most tightly with the main shaft brake ring 4, and the main shaft brake ring 4 drives the main shaft 1 to be braked together. The brake effect is excellent, the brake force is symmetrical and stable, and a unilateral force is not formed on a main shaft bearing, so that the precision of a main shaft of the equipment is kept for a long time.

In summary, the present invention is only a preferred embodiment, and not intended to limit the scope of the utility model, and all equivalent changes and modifications in the shape, structure, characteristics and spirit of the present invention described in the claims should be included in the scope of the present invention.

Claims (7)

1. The utility model provides a main shaft brake mechanism, includes main shaft and main shaft box, the main shaft sets up in the main shaft box, its characterized in that still be equipped with the braking base in the main shaft box fixed cover is equipped with main shaft braking ring on the main shaft, and main shaft braking ring is located on the braking base still be equipped with two eccentric braked wheels, two on the braking base eccentric braked wheel is located respectively the both sides of main shaft braking ring, both sides eccentric braked wheel pushes through the boosting mechanism that corresponds respectively and rotates and go the suppression main shaft braking ring, makes the main shaft can brake.

2. A spindle brake mechanism according to claim 1, wherein the eccentric brake wheel is mounted on the brake base through an eccentric brake wheel mounting seat, a deep groove and a shallow groove are oppositely arranged on two sides of the eccentric brake wheel mounting seat, the eccentric brake wheel is mounted in the deep groove through an eccentric brake wheel mandrel, an inclined wedge block is arranged in the shallow groove, a concave surface of the shallow groove is an inclined surface and is attached to the inclined surface of the inclined wedge block, and the boosting mechanism is connected with the inclined wedge block.

3. A spindle brake mechanism according to claim 1 or claim 2, in which the boost mechanism is a cylinder.

4. A spindle brake mechanism according to claim 2, wherein the slope of the concave surface of the shallow groove is 5 °, and the slope of the tapered wedge is also 5 °.

5. The spindle brake mechanism according to claim 2, wherein a return pin is further provided on a side surface of the eccentric brake wheel mounting seat, a return spring is further provided in the brake base, and a front end of the return spring abuts against a lower portion of the return pin.

6. A spindle brake mechanism according to claim 1 or claim 2, wherein the eccentric braking drum is coated with a wear resistant brake pad.

7. A spindle brake mechanism according to claim 1, wherein a mounting flat key is provided on each of both sides of the spindle on which the spindle brake ring is mounted, and a flat key groove is provided on each of both sides of an inner surface of the spindle brake ring, the mounting flat keys being inserted into the flat key grooves so that the spindle brake ring and the spindle are fixed.

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