UA21946U - Hinge of universal spindle - Google Patents

Abstract

A hinge of universal spindle of rolling mill comprises barrel-shaped rollers, a holder and a bushing, in which the radii of semi-cylindrical grooves are larger than the radius of average section of rollers, and the centres of semi-cylindrical grooves are displaced relative to pitch circle toward the centre hinge in the holder and from the centre of hinge in the bushing, the generatrix of the barrel-shaped rollers is outlined by the curve of variable radius. Furthermore, the value of variable radius of curvature of longitudinal generatrix of roller is determined from the appropriate dependence.

Description

Description of the invention

The useful model refers to rolling production and can be used as a universal hinge 2 of the rolling mill spindle.

The hinge of the universal spindle of the rolling mill is known, which includes a sleeve and a clip between which barrel rollers are installed in semi-cylindrical grooves. The end segments of the rollers are made in the form of truncated cones symmetrical with respect to the central section, and the length of the central segment is equal to

Kotakh o de K - the radius of the generative barrel surface of the roller; 7th cell, the limit angle of skew of the hinge (author's certificate Mo1601873, IPC B21835/14).

The disadvantage of the analogue is that the hinge with such rollers can work reliably only at small skew angles. When the angle of inclination of the hinge increases, there are sharp jumps in contact pressure when moving from the barrel part of the roller to the conical sections. In addition, the gap between the rollers and the grooves increases as the inclination angles increase, which leads to the occurrence of excessive wedging forces that act on the grooves from the side of the clamped rollers located in the plane at 902 to the plane of maximum inclination, which, accordingly, increases the contact pressures between by them, their wear and tear reduces the efficiency and durability of the hinge.

The closest technical solution (Russian patent Мо2089308, МПК В21835/14) is the hinge of the universal spindle of the rolling mill, which includes a clip, a sleeve and barrel rollers installed between them in semi-cylindrical grooves. The centers of the semi-cylindrical grooves are offset relative to the pitch circle to the center of the hinge in the clips and from the center of the hinge in the bushings. The shape of the rollers is outlined by a curve of variable radius, which decreases from the middle of the roller to its ends. It should be noted that due to the reduction of the radii of curvature of the rollers on the segments located closer to its ends during the operation of the hinge in conditions close to the limit values of the angular working range of the change in the angle of inclination of the spindle, the contact surfaces in the power chain of the "rollers-passion" decrease and increase in the elements contact stresses. It is known that the stresses on the contact surface are determined according to Hertz's problem by the formula: where A and B are correction coefficients;

P - the value of the force acting in the "groove-roller" contact zone, MN; 40 E - modulus of elasticity, MPa; - с Гр - boring radius of semi-cylindrical grooves (the value is constant for one standard size of the universal spindle), mm; ги - current value of the radius of the cross section of the roller, mm; в; - current value of the longitudinal curvature of the generating roller, mm. 45 Analysis of geometric parameters of the roller and semi-cylindrical grooves for the i-th sections of the roller shows that when the contact spot of the roller moves away from the central section of the roller to the end, the value under the cube root - (formula 1) increases by 1.5...2 times. The value A (formula 2 ) as the contact spot moves away from the central cross-section of the roller to its end also increases. The value B (formula 3) when decreasing the variable radius u-o of the longitudinal curvature gi from the middle of the roller to the end will also increase slightly, as due to a 29 decrease in the value of g, as well as by reducing the value of rb;.

І) This causes high contact pressures, wear of semi-cylindrical grooves and rollers, misalignment of the clamp relative to the sleeve due to wear and beating of the spindle during rolling, which reduces the reliability and durability of the hinge.

The basis of the useful model is the task of increasing the durability of the hinge and its reliability. c This task is solved due to the technical result, which consists in increasing the area of contact surfaces that perceive working loads.

To achieve the above result, the joint of the universal spindle of the rolling mill, which includes barrel rollers, a clip and a sleeve, in which the radii of the semi-cylindrical grooves are made more than 60 times the radius of the average cross-section of the rollers, and the centers of the semi-cylindrical grooves are shifted relative to the pitch circle to the center of the hinge in the clip and from the center of the hinge in the bushings, the generating line of barrel rollers is outlined by a curve of variable radius, according to the useful model, the value of the variable radius of curvature of the longitudinal generating roller is determined according to the following dependence: 6) with")

W 0 -- 2: - 2 - 5 51 then zip- (5) 2 2 7 (2I- length in pk - sov) and sh- by p. ; 505) where rod is the longitudinal curvature in the central part of the roller, mm; rt" the curvature of the generating roller in the end section, mm; t - the angle of inclination of the tangents at variable points of the roller, degrees; se - the angle of the hinge, degrees; "x - the length of the roller, mm; in addition, the end radius of the cross section of the roller is determined by :

Rv te v Yad ta be E sov 2.2 z no) 2 where gr - radius of boring of semi-cylindrical grooves of clamp and sleeve, mm.

As a result of the comparative analysis of the proposed hinge of the universal spindle with the prototype, it was established that they have the following common features: - a clip and a bushing, in which the radii of the semi-cylindrical grooves are larger than the radius of the average cross-section of the rollers; F - the centers of the semi-cylindrical grooves are shifted relative to the dividing circle to the center of the hinge in the bracket and from the center of the hinge to the bushings; "- - barrel-shaped rollers, in which the generating area is delineated by a curve of variable radius; as well as distinguishing features: - the value of the variable radius of curvature of the longitudinal generating roller is determined by the dependence

Tu Vo uz.

Vr vo A i FO, and |) 5 Z 1 « (5) shi s - the face radius of the cross section of the roller is determined by the dependence:» te sho ta vn so8- 2 7 no de gr - the radius of boring of the semi-cylindrical grooves of the clamp and sleeve, mm .

Thus, the proposed joint of the universal spindle has a new design of nodes and parts, new connections of nodes and parts, as well as a new arrangement of them relative to each other. c There is a cause-and-effect relationship between distinctive features and the technical result that is achieved.

Due to the fact that the value of the variable radius of the longitudinal curvature of the generating roller is determined by the cubic t» 50 dependence, i.e., the geometric parameters of the roller, according to the formula of the useful model, became

Ф Vi - vo schi KI phi z) that it became possible to reduce the gap in the "groove-roller" engagement, to increase the area of contact surfaces that 22 perceive the load at all angles of inclination of the spindle, including at the maximum, which leads to a decrease in pressures on unit of contact area and increases durability.

The exclusion of at least one from the above-mentioned set of distinguishing features does not ensure the achievement of a technical result.

The claimed technical solution is not known from the prior art and is therefore novel. because the Solution that is claimed is industrially applied, because its technological and technical implementation does not present difficulties. According to this technical solution, the design of the machine drive, pipe welding unit of the Khartsyz Pipe Plant was completed.

Thus, a technical solution can be presented with legal protection because it is new and industrially applied, that is, it meets the criteria of a utility model. 65 The technical solution is explained by drawings that show:

Fig. 1 - a general view of the hinge of the universal spindle;

Fig. 2 - the position of the roller at the tilt angle of the hinge se;

Fig. 3 - parameters of the roller, construction of the creative roller;

Fig. 4 - sections of the longitudinal profiles of the rollers.

The roller joint (Fig. 1) includes a sleeve with a spherical head 1, a clip 2, mounted on the drive shaft.

Between the sleeve 1 and the clip 2, in the semi-cylindrical grooves cut on them, barrel rollers 4 with shanks are installed to transmit the torque from the clip to the head and vice versa. Spherical head 1 and clip 2 are connected to each other on the spherical contact surfaces of sphere O through spherical rings 5, 6, 7. Ring 5, which limits the axial shift of rollers 4 to the side of the clip, is rigidly installed on head 1 and is in contact with ring 6, 7/0 installed in the bracket 2. The ring 7 is installed in the cover 8, fixed in the bracket using a bayonet connection. A rubber cord 9 is used to seal the cover 8. In order to prevent rotation of the cover 8 relative to the clip 2, latches 10 are installed in the slot, which are fastened with stops 11. The shaped cover 12 is fixed with bolts 13 on the end of the cover 8. A seal 14 is installed in the annular groove of the shaped cover 12, which contacts both with sphere O of the head 1 and with the inclined surface of the cover 8, which ensures reliable retention of lubrication in the 7/5 roller joint. Slots 15 are cut on the landing surface of the clamp 2 for connection with the drive shaft 3.

Plugs 16 are provided to supply lubrication to the hinge. Lubrication is pumped into one of the holes when the other two plugs are unscrewed. For roller joints, metal plating lubricant type SM-02 "L" is used

TUZ8.101.1075-86. After filling the lubrication cavity, plugs 16 are screwed.

Fig. 4 shows curves 19, 20, 21, 22 corresponding to the creative curvilinear surfaces of the rollers in the claimed solution, analogue and prototype.

The universal joint works like this.

When working in the range of tilt angles z" between parts 1 and 2, barrel rollers 4 are tilted relative to their longitudinal axis by an angle o (Fig. 2). Fig. 2 shows the location of the roller in the semi-cylindrical grooves 17 of the head 1 and the semi-cylindrical grooves 18 of the clip 2, which at an angle intersect at the point O of the geometric axes

O.O" and O30,. The roller is shown in Fig. 2 in the position which is farthest from the plane formed by these axes. At the same time, its central point is located on the perpendicular to the plane of the hinge axes, drawn through the point O of the intersection of these axes. Due to the relative rotation of the semi-cylindrical grooves 17 and 18, the diameters of the cross-sections of the roller placed in them decrease during the transition from the middle section of the roller to the end section. At the same time, the radius of the average cross-section of the roller is less than the radius of the grooves. ish

The geometric axis of the roller О5Об is located to the axes of the grooves at an angle в Tvirna 19 of the curved surface "ф 2 of the roller has a decreasing angle of inclination of the tangent to the axis О5О5 of the roller when moving from the end face ВС and АЮО to the inside 0) of the roller. This allows the universal spindle to work at angles less than 9.

The proposed technical solution provides at the point Ao (Fig. 3) the curvature ra according to formula 5. When --

From this, the centers of the radii of curvature Ko and Kt are located on the axis of symmetry of the hinge, and the other points are K; will be located on some curve - the evolute of the generating AA from the working surface of the roller. The angle of inclination of the tangent to the generator at the end point A remains equal to vd at the point Ao-0. At the same time, the radius ru, the longitudinal curvature of the generating roller at point A (Fig. 3) will be greater than the radius K, which will have a positive effect on the contact strength. "

The generator according to the technical solution of the analogue is shown in the form of curve 20 (Fig. 4). Curve 21 is also known, which is used as a generator of rollers and is part of a circular arc with a radius of y (article by E. Ya. Antonyuk,

Sho:z" 28ip5

Bobukh V.I. Research on roller joints with increased misalignment angles. / ТЗНП "Improvement of processes and equipment of pressure processing in metallurgy and mechanical engineering" DDMA Kramatorsk-Slovyansk, 20031. imo) The factory of rollers according to the technical solution of the prototype corresponds to curve 22. - As can be seen from the comparative analysis of the curves shown in Fig.4. the most favorable for contact strength is the longitudinal forming roller, which is implemented through the mathematical cubic law according to the formula of the technical solution). 20 At the same time, the face radius of the roller depends only on the geometric parameters of the roller, the radius of boring of the semi-cylindrical grooves gr and the maximum angle of the universal joint (formulas 8 and 9). m. Other parameters of the roller profile gt, at, rt and o are determined by known formulas and calculated by a computer program. The readings of these parameters are presented in Table 1 for Ko-212.5mm and gr-37.5. 25 s of lexis not dreaming 9

Ba a a vana neck 65 fF - angle of inclination of tangents at variable points of the roller, degrees; se - hinge skew angle, degrees;

at - the end arrow of the change in the transverse radius of the roller g, which characterizes the size of the clearance in the roller engagement;

Гт - face radius of the cross section of the roller, mm;

W" is the curvature of the forming roller in the end section, mm; h - the middle radius of the roller, mm.

It can be seen from all of the above that the proposed design of the universal hinge with the profile of the curvature of the longitudinal generating roller, according to the formula of the useful model, allows to increase the reliability of the hinge and its durability.

Claims (1)

The formula of the invention The hinge of the universal spindle of the rolling mill, which includes barrel-shaped rollers, a clip and 75 bushings, in which the radii of the semi-cylindrical grooves are made greater than the radius of the average section of the rollers, and the centers of the semi-cylindrical grooves are shifted relative to the dividing circle to the center of the hinge in the clip and from the center of the hinge in bushings, the generator of barrel-shaped rollers is outlined by a curve of variable radius, which differs in that the value of the variable radius of curvature of the longitudinal generator roller is determined from the following dependence: -- p-2 2|. and FI sip-- - NP -- (Se) « U Z sov V vp- V. 1-so87 I - k- -/, OZ t -Y (22) 2) 7772 tamy 2 tu 2 - - «- 2 2 2 more : . c de Ro - longitudinal curvature in the central part of the roller, mm; Rup - curvature of the generating roller in the end section, mm; Ф - the angle of inclination of the tangents at variable points of the roller, degrees; A - hinge skew angle, degrees; " - roller length, mm; з0 2 J - s in addition, the end radius of the cross section of the roller is determined from the dependence: и 7, а;» го--- "от" --и- т 6 2572 соа5- 2 ko та - 7 Ів ш--/ с 4 и» 50 de gr - radius of boring of semi-cylindrical grooves of clamp and sleeve, mm. 42) p. 60 b5