SU1503914A1 - Sliding bush for universal joint - Google Patents

Abstract

The invention relates to rolling production, in particular to devices for the main drive of the rolling stands, and can be used to transfer the rolls and torque to the rolls of the working stand. The purpose of the invention is to increase the durability and reliability of the liner, as well as reduce dynamic loads. The torque from the head 1 of the spindle to the blade 2 of the work roll is transmitted by means of an insert consisting of the centering part 5 and mutually spring-loaded segment elements 6 and 7, mounted on the pin 4 of the cracker 3. Part 5 and elements 6 and 7 are interconnected over the contact surface, which in cross section is a double wedge with slopes to the edge of part 5. The design feature consists in making holes in the segment elements 10 in the form of rectangular grooves coaxially with the holes under the pin 3. The support 12 with a hole under the trunnion 4 that corresponds to it in shape and size can be made of steel with a bronze bushing placed in its opening. This makes it possible to eliminate the formation of gaps in the joints when the segment elements move apart with springs when they are worn, and also to rigidly fix the hinge elements in space. 2 hp f-ly, 4 ill.

Description

3150

The invention relates to rolling production, in particular to devices for the main drive of the rolling stands, and can be used to transfer the rolls and torque to the rolls of the working stand.

The aim of the invention is to improve the durability and reliability of the liner, as well as to reduce the dynamic loads.

Figure 1 shows the universal sliding joint with the proposed liner; FIG. 2 is a section A-A in FIG. 1; on fig.Z - section bb ka 2; Fig, 4 is a section bb In Fig.2.

The liner universal hinge sliding drive rolling stand made as follows.

The head of the spindle 1 is articulated with the blade 2 of the mill roll with the aid of crackers 3 with pins 4 and two. inserts forming a universal sliding joint. The rusk is rectangular in cross section and positioned so that the blade can move in the rectangular slot.

The insert consists of a centering part 5, made in the form of a double wedge with slopes outwards, i.e. to the edges of the centering part in cross section. In the cylindrical bore of the spindle head, spring-mounted segment elements 6 and 7 are installed, in the blind holes 8 of which, arranged in the transverse direction, are located the compression spring 9. In the centering part 5 and the segment elements 6 and 7 of each insert, coaxial holes 0 are made. The holes 10 in the elements 6 and 7 are made cut at the contact point of the elements, i.e. in each element there is a half-hole. Coaxial protrusions 11 are made on the outer surface of the segment elements 6 and 7, ensuring fixation of the elements in the bore of the spindle head 1 from longitudinal movement. The hole 10 in the segment elements 6 and 7 is made in the form of transverse rectangular coaxial grooves aligned with the open part between themselves and forming a dissected rectangular-shaped hole together. A rectangular bearing 12 is installed in the rectangular hole 10

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five

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25 3Q

(from 40 ДЗ гс 4

with a cylindrical hole 13 under the pin 4 rusk 3.

The proposed solution provides a guaranteed clearance due to a suitable fit between the hole 13 in the support 12 and the trunnion 4, as well as close and constant contact between the transverse edges 14 of the support 12 and the edges of the rectangular hole 10 in contact with them, regardless of the amount of displacement of the elements 6 and 7 relative to each other. Contact density is determined by the design of the first choice of appropriate fit.

Bearing 12 allows the contact surface of edge 14 to be increased by one to two orders of magnitude. The movement of the spring-loaded elements b and 7 in the process of wear practically does not violate the density of contact between the faces 14 of the support 12 and the adjacent faces of the hole fO, as well as between the hole 13 and the trunnion 4, and does not lead to the formation of a gap between the latter even at maximum transverse displacements of elements 6 and 7. Due to the developed contacting surface of faces 14 and faces of hole 10, the specific loads from pin 4 on support 1 2 and face 14 are sharply reduced, which improves the working conditions of the hinge parts. All the above excludes the formation of gaps and backlashes in the considered units, eliminates them. Intensive wear, the occurrence of dynamic loads, increases the durability and quality of rolled products, and also increases the productivity of the mill.

The dimensions of the support 12 correspond to the dimensions of the rectangular opening 10 with the collapsed elements 6 and 7, which excludes the formation of gaps between the transverse edges 14 of the support 12 and their corresponding ones. edges of the hole 10. When expanding the elements 6 and 7 to compensate for wear between the longitudinal edges of the support 12 and the longitudinal edges of the hole 10, adjacent to each other, minimum gaps are formed equal to the amount of movement of the elements. arises to the durability of the joint and the reduction of dynamic loads.

The lower part of the support 12 is in contact with the centering part 5 and is made corresponding to its shape and size, which additionally fixes the support in a given initial

working position and eliminates, taking into account the impact of the trunnion 4, both longitudinal and transverse displacement of the support during the operation of the hinge. In this case, the hinge system becomes rigidly fixed in space, while maintaining constant wear compensation, takyre increases reduces dynamic loads.

Bearing 12 is made of steel, and in its opening 13 there is a thin-walled bronze bushing 15, which provides anti-friction pairs on the surfaces to be contacted, helps to reduce wear, and also increases durability and reliability of the hinge as a whole and reduces dynamic loads. In addition, this saves scarce bronze and ensures good working conditions of the friction units. A worn support 12 can easily be replaced with a new one.

The proposed contribution works as follows

The rotation and torque is transmitted directly through the head 1 of the spindle, then through the segment elements 6 and 7 and the centering parts

5 inserts to the blade 2 working roll of the rolling stand. As the wear surfaces of the segmented elements 6 and 7 and the centering part 5 of the przgasina 9 wear apart the elements

6 and 7 to a full sampling of the gaps. Compensation of wear occurs automatically gradually over the entire operation of the hinge. Springs

0

50

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ABOUT

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9 provide a constant tight fit between the rubbing surfaces of the bore of the head 1, the segment elements 6 and 7, the centering parts 5 and the blade 2 between them. This eliminates the formation of gaps in the joints and dynamic loads, as well as increases the durability and reliability of the hinge as a whole.

Claims (3)

Invention Formula 1, The insert 1 of the universal joint of the slide, consisting of the centering part, made in the form of a double wedge with inclinations to its edges and. mutually spring-loaded segment elements supported on it, the centering part and the segment elements are made with holes for a pin under the cracker, characterized in that, in order to increase durability and reliability of the insert, as well as reduce the dynamic loads, the insert is provided with a square support with a hole under the pin of the cracker installed in the segment elements in the rectangular grooves made coaxially with the hole of the pin under the pin. 2, Pop liner 1, characterized in that the lower part of the support is associated with the centering part and is made corresponding to its shape. 3. Contribution 1 and 2, otli-. due to the fact that the support is provided with a bronze bushing installed in its opening. / - / f 15 Figg Bb / Y /////////// Fig.Z Llb 15 FIG.