RU2361802C1 - Tower crane mobile support frame - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: proposed tower crane mobile support frame comprises central part with upper and lower sheets, backup ring with holes, and frame bracket supports linked up with the frame central part with the help of swivel pivots and braces. The frame central part incorporates cross box-like beams. Conical spacers are arranged between replaceable box-like beams and rigidly jointed thereto. Stiffness ribs are vertically attached to each of previously mentioned spacer, at its top part and along the frame perimetre. Every previously mentioned conical spacer and vertical walls of each beam are rigidly jointed to the said upper and lower sheets. Every stiffness rib is located between the said backup ring holes. The frame central part and bracket supports are furnished with interacting stops. The frame is furnished with ring rigidly attached to upper sheet, the said ring being provided with stiffness ribs attached to the ring along its outer. Every rib has its end face is rigidly jointed to upper sheet. Aforesaid backup ring is located on stiffness rib top end face and rigidly connected thereto. Recesses are made between adjacent ribs, backup ring and upper sheet. Aforesaid recess shape matches that of backup ring.

EFFECT: frame higher strength, simpler assembly and servicing.

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Description

This technical solution relates to the supporting frames of hoisting machines, in particular to the running supporting frames of tower cranes having a central part and peripheral parts pivotally connected to it.

Supporting frames are known, each of which contains a central part made of vertically closed walls forming a shell having upper and lower sheets, peripheral parts connected to the central part of the frame, while the central part of the frame has inclined diaphragms located between the vertical walls of the shell, and on the upper sheet of the Central part is fixed the support circle [1-4].

Known running support frame of a tower crane containing a Central part with upper and lower sheets, fixed on the top sheet of the support ring with holes in it and the upper sheet, connected by pivots and struts with the Central part of the console, and the Central part of the frame is made with cross-shaped box-shaped beams, between adjacent box-shaped beams are conical inserts rigidly connected to them, to each of which in its upper part along the frame perimeter are stiffening ribs vertically attached, each to The insert is rigidly connected to the upper and lower sheets of the central part of the frame, each stiffener is located between the holes of the upper sheet, while the vertical walls of each beam and conical inserts are connected to the upper and lower sheets, and the central part of the frame and console are made with interacting stops [5].

Designs [1-5] solve the problem of increasing the strength of the central part of the frame of a tower crane, while these designs have a relatively high metal consumption and the complexity of manufacturing, and design [8] solves the problem of significantly reducing the weight of the frame. However, as shown by the practice of using this frame in operation, it does not adequately meet the strength requirements at the junction of the central part of the frame with its consoles, and access to the bolts securing the rotary support of the crane to the central part of the frame is difficult at these points of connection, which significantly affects the complexity of the assembly of the frame and its maintenance.

The closest technical solution to this invention in essence and the achieved effect is the running support frame of the tower crane [5], which has the common features with the frame described in this description that the frame contains a central part with upper and lower sheets, a support ring with holes , frame consoles connected by pivots and struts with the central part of the frame, while the central part of the frame is made with crosswise box-shaped beams, rigidly connected between adjacent box-shaped beams stiffened conical inserts with stiffeners, to each of which in the upper part along the frame perimeter are stiffening ribs, each conical insert and the vertical walls of each beam are rigidly connected to the upper and lower sheets, each stiffener is located between the holes of the support ring, the central part of the frame and consoles are made with interacting stops.

This technical solution solves the problem of reducing the mass of the frame, however, some elements of the frame, as shown by its operation, do not meet the strength requirements, and the location of the bolts of the fastening elements of the support-rotary device to the support ring of the frame is associated with limited accessibility to them, which negatively affects the complexity assembly of the crane and its maintenance.

The technical result of the invention is to increase the strength of the frame, ease of assembly and maintenance.

To obtain the indicated result, the running support frame of the tower crane contains a central part with upper and lower sheets, a support ring with holes, frame consoles connected by pivots and struts with the central part of the frame, while the central part of the frame is made with cross-shaped box-shaped beams between adjacent box-shaped beams are rigidly connected to them conical inserts, to each of which in the upper part along the perimeter of the frame are stiffened ribs, each conical insert the vertical walls of each beam are rigidly connected to the upper and lower sheets, each stiffener is located between the holes of the support ring, the central part of the frame and console are made with interacting stops, and the frame is made with a shell rigidly attached to the upper sheet with ribs attached to it stiffness along the outer perimeter of the shell, each edge with the lower end is rigidly connected to the upper sheet, the support ring is located on the upper ends of the stiffeners and on the upper end of the shell and connected to them, between adjacent ribs, the support ring and the topsheet recesses, in each of which the contour is the contour of the support ring opening.

Figure 1 shows the running support frame of a tower crane.

In Fig.2 - view A in Fig.1.

Figure 3 - the Central part of the frame (without consoles).

Figure 4 is a view of B in figure 3.

Figure 5 is a view In figure 3.

Figure 6 shows the connection of the Central part of the frame with the console.

The running support frame of the tower crane contains a central part 1 (Fig. 1) having crosswise arranged beams 2 with which the upper and lower sheets 3 and 4 are connected. The central part of the frame has a support ring 5 for a rotary support of the tower crane (not shown). In the support ring 5 there are many holes 6 (figure 4), which are located around the perimeter of the support ring 5 and the Central part of the frame. The holes are intended for fastening the rotary support of the crane to the central part 1 of the frame (the support is not shown).

The peripheral parts of the frame are connected to the central part 1 of the frame, which are four consoles 7 (Figs. 1, 2), each of which is connected to the central part 1 of the frame by a pivot 8. Each console 7 is additionally connected to the central part 1 of the frame by a strut 9. Outer sides 10 and 11 (Fig. 3) of adjacent beams 2 are connected by inclined diaphragms 12 (Fig. 5).

The frame has stiffening ribs 13 (Figs. 1, 3), which are located along the height of the frame and are attached to the conical inserts 14 located between the beams 2 and rigidly connected with them, the upper and lower sheets 3 and 4. Each conical insert 14 is made convex in the outside of the frame. Each rib 13 is located vertically between the holes 6 (figure 2) of the support ring 5.

Conical inserts 14 are located between the vertical walls 10 and 11 of the beams 2 and are rigidly connected to them.

Each box beam 2 has a rectangular shape in cross section. Each conical insert 14 is inclined to the central axis 15 of the frame (figure 3). Each beam 2 at the end has an inclined end wall. In the frame, on the axis 15, there is a central hole 16 (Fig. 4), formed by a pipe rigidly fastened to the beams 2. At the end of each console 7 (Fig. 6) an eye 17 is made under the pin 8, which is located in the eyes 18 (Fig. 4) the central part of the frame. Each console 7 has a stop 19 made therein, interacting with the stop 20 of the central part 1 of the frame. The stop 20 is located in the recess of the beam 2 of the frame.

The frame is made with a shell 21 rigidly fixed on the upper sheet 3 (Figs. 1 and 3) and with stiffening ribs 22 attached to it located along the outer perimeter of the shell (Fig. 4). Each rib 22 with the lower end 23 is rigidly connected to the upper sheet 3, and the support ring 5 is located on the upper ends 24 of the ribs 22, at the upper end 25 of the shell 21 and is rigidly connected to them. Between the adjacent ribs 22, the support ring 5 and the top sheet 3, recesses 26 are made, in the contour of each of which there is a contour of at least one hole 6 of the support ring 5. In cross section, the support ring 5, the shell 21 and the top sheet 3 are I-beam ring beam.

The frame works as follows. When the tower crane is operating on its slewing ring, alternating compression and tension loads occur. In this case, the support ring 5 of the frame receives loads from the support ring of the slewing ring of the tower crane. Compression loads are transferred from the ring 5 to the shell 21, stiffeners 22, the top sheet 3 and further to the elements of the central part 1 of the frame. Further, through the stops 19, the loads are transferred to the stops 20 of the consoles 7 and the pivots 8. In the event that tensile loads occur on the frame, they are perceived by groups of bolts (not shown) that are located in the holes 6 of the support ring 5 (Fig. 2) and in the holes of the other support ring connected to this support ring, which is part of the rotary support device of the tower crane. Since in the cross section the support ring 5, the shell 21 and the top sheet 3 are an I-beam annular beam, the compression loads are perceived by these elements, are evenly distributed around the circumference of the central part 1 of the frame and, thus, eliminate stress concentration on the frame. Moreover, the strength of the frame during the perception of compression loads increases. Tensile loads are transmitted in the reverse order and are perceived by the indicated frame elements, as well as by the bolts connecting the frame to the support ring of the crane slewing ring.

Information sources

1. SU 1043096 A, 09/23/1983.

2. SU 1685857 A1, 10.23.1991.

3. DE 3013513 A, 10.30.1980.

4. RU 2218287 C1, 08.27.1998.

5. RU 2297967 C1, 04/27/2007 (prototype).

Claims (1)

A running support frame of a tower crane containing a central part with upper and lower sheets, a support ring with holes, frame consoles connected by pivots and struts with the central part of the frame, while the central part of the frame is made with crosswise box-shaped beams, between adjacent box-shaped beams are rigidly located conical inserts connected to them, to each of which in its upper part along the frame perimeter are stiffening ribs vertically attached, each conical insert and vertical walls of each the flanges are rigidly connected to the upper and lower sheets, each stiffener is located between the holes of the support ring, the central part of the frame and console are made with interacting stops, the frame is made with a shell rigidly attached to the top sheet with stiffeners attached to it along the outer perimeter of the shell, each rib with the lower end is rigidly connected to the upper sheet, the support ring is located at the upper ends of the stiffeners and at the upper end of the shell and is rigidly connected with them, between adjacent ribs recesses are made with the support ring, and the top sheet, in the contour of each of which there is a contour of the support ring opening.

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