DE2015581B - Roll stand for a continuous rolling mill - Google Patents

Description

The invention relates to a roll stand for a continuous rolling mill for metallurgical products small width, which is arranged by pivoting its upper frame part around a Axis can be opened a little when rolling stock stowage, while at the same time disengaging the on Gear wheels arranged on drive shafts for the rotary movement of the rolling stock processing Rollers.

In a known roll stand of this type, it can happen that when you open the stand in the course of the whale process by more than the length of the intervention of the teeth of the two gears suspends the connection between the gears, so that not there is more certainty that when the framework is closed, the tooth pitch will mesh again Im going to remedy that disadvantage the teeth of the two gears would be lengthened, but this would reduce the strength of the teeth in the reduce the same ratio, which is due to the large forces that the gear pair has to transmit is not advisable.

The invention has / ur task, the proper To ensure meshing without weakening the teeth? U when the device is around more than the length of the teeth of the two gear wheels is opened.

This object is achieved according to the invention solved that on the drive shafts coaxially to the gear wheels additional in engagement Gears arranged with the same pitch circle and the same pitch, but greater tooth depth and the additional gears are elastically connected to the transmission gears.

In order to avoid great forces from one axis to the other through the additional gears are transmitted, is according to the invention each of the additional gears with the coaxial gear assigned to it by elastic pins od, the like,

connected. At least one of the

a pin receiving holes on his that

adjacent gear at the opposite end

have expanded, truncated cone-like part.

When the roller axes are in working position and

iq all transmission gears when one to be transmitted occurs Couples of forces are in engagement, the part of causes on the additional gears acting force couple a slight bending of the elastic pins, whereby the together meshing flanks of the additional gears

are disengaged and finally the gam.e process

unrolls as if only the transmission gears had to transmit the force couple.

The invention is shown in the drawing for example.

F ~ i ε. 1 shows a schematic cross section of the toothing of the two gear wheel pairs, namely the shark transmission gears and the additional ones Zahnräv «r in working position;

F i g. 2 is a schematic drawing of the disengaged brought gears.

In Fig. 1, the teeth of the two transmission gears 19 and 19 a are shown in the working position with full lines.

With 25 and 25a, the pitch circles of the two transmission gears are shown in the engagement position De.

With 26 and 26a the outer arcs are de-transmission gears 19 and 19a.

The depth of engagement of the teeth of the gearwheels 19 and 19a is designated with α.

In the same figure, the dashed lines outline the coaxial interconnection of the additional Gears 119 and 119a specified It can be seen that the side part as an involute of the circle Gear wheels 19 and 19a are also present in gears 119 and 119a; however this is lengthened in comparison with the former on the side of the foot and the head of the teeth.

However, the pitch circles 26 and 26a are the same for both gears.

In FIG. 2 are the same parts included as the however, both transmission gears are in the disengaged position.

The distance between both axes is such.

So that in this case the outer arcs of the partial circles 26 and 26a of the corresponding transmission gears 19 and 19rt are tangent to one another (or practically have a slightly larger distance from each other, so that the corresponding teeth are no longer touch their circumference).

Compared to their previous Stt 'ig, the two partial circles 25 and 25a have separated from each other by O distance h.

When r denotes the intersection of the ancestors of the additional gear wheels. d. H. the maximum width of the area common to the circles delimited by the circumferences 27 and 27 </, which the represent outer arcs of the teeth of the additional gears, so the following parallel be set up:

If the required minimum penetration depthc is regarded as the safety rate and s is mentioned, from FIG. I can see that if only that

015 581

both gearboxes 19 Mn4 19 «available - they would be separated by the distance (<w)

could become,

From F ι g, 2 it can be seen that this distance can be increased up to the distance b , if the distance c with the required safety rate

is identical.
A numerical example is intended to illustrate

serve. Accepted

a = 18 mm,
s = 9 mm,

so can in the first FRI) the two have the following distance

fl - i = l8 - 9 = 9mm, Tm second case, though

c = s - 9 mm, can the gears by b = 18 mm

be moved apart, taking into account the specified safety rate.

1 sheet of drawings

Claims (3)

Patent claims: 1. Roll stand for a continuous rolling mill for metallurgical products of small widths, by pivoting its upper frame part about a correspondingly arranged axis Wakgutstauungen can be opened somewhat while disengaging the on Gear wheels arranged on drive shafts for the rotary movement of the rolling stock processing Rollers, characterized in that the drive shafts are coaxial with the gear wheels (19, 19 a) additional meshing gears (119, 119 ″) with the same Pitch circle (25) and the same pitch, but larger teeth *; efe arranged and the additional Gears (il9. 119a) are elastically connected to the transmission gears (19. 19a). 2. Roll stand according to claim 1, characterized in that each of the additional gears (119, 119a) with the coaxial drive gear (19, 19a) assigned to it by elastic Pins connected. 3. Roll stand according to claim 2, characterized in that at least one of each a pin receiving holes on its opposite the adjacent gear End of an enlarged 'keg'! Blunt-like part having.