TROLLEY OF ROPE CRANE

Abstract

A trolley of a rope crane, comprising a trolley body, a transverse load beam of the trolley, a hoisting mechanism and comprises a rope drum, a hoisting motor for driving the rope drum, and a gear for coupling the hoisting motor to the rope drum, whereby the gear has a primary side and a secondary side, and whereby the rope drum is located, in the vertical direction of the trolley, between the hoisting motor and load beam parallel to the load beam. The hoisting mechanism is supported by a three-point support to a main beam, whereby the first support point and second support point are adjacent to the secondary side of a gear, and whereby the third support point is formed by a support of the rope from end facing away from the gear to the load beam at a lateral distance from the first and second support point.

Claims

1. A trolley of a rope crane, comprising: a trolley body, a transverse load beam of the trolley, forming part of the trolley body, a hoisting mechanism which is supported to the trolley body and comprises a rope drum for at least one hoisting rope, a hoisting motor for driving the rope drum, and a gear for coupling the hoisting motor to the rope drum, and whereby the gear has a primary side coupled to the hoisting motor, and a secondary side coupled to the rope drum, and whereby the rope drum is located, as seen in the vertical direction of the trolley, between the hoisting motor and load beam parallel to the load beam, whereby the hoisting mechanism is supported by a three-point support to a main beam, whereby the first support point and second support point are located adjacent to the secondary side of the gear so that the first support point is higher on the main beam and the second support point is lower on the main beam at a distance from the first support point, and whereby the third support point is formed by a support of the rope drum end facing away from the gear to the load beam at a lateral distance from the first and second support point, wherein at the first support point, the movement of the gear in the vertical, longitudinal, and transverse directions is prevented, but rotation is allowed, at the second support point, the movement of the gear in the direction towards the load beam is prevented, but movement in the longitudinal and vertical direction of the load beam as well as rotation are allowed, and at the third support point, the movement of the rope drum end facing away from the gear in the vertical direction and towards the load beam is prevented, but movement in the longitudinal direction of the load beam and rotation are allowed.

2. A trolley as claimed in claim 1, wherein the hoisting mechanism comprises a vertical installation flange fastened to the flank of the gear, or forming part of the casing of the gear, whereby the first support point comprises a first lug on the vertical side of the load beam, in its top part, to which lug the top part of the installation flange is supported by means of a pin and ball joint in the longitudinal direction of the load beam, which are installed through openings at the top part of the installation flange and the first lug; the second support point comprises a second lug on the vertical side of the load beam, in its bottom part, which has a vertical opening to which a support protrusion formed in the bottom part of the installation flange extends; and the third support point comprises a third lug on the vertical side of the load beam, at the rope drum end facing away from the gear, to which the end of the shaft of the rope drum is supported.

3. A trolley as claimed in claim 2, wherein in the second lug, a horizontal pretension is arranged towards the vertical side of the load beam.

4. A trolley as claimed in claim 2, wherein between the vertical side of the load beam and the second lug, there is arranged a slide surface.

Description

LIST OF FIGURES

[0009] The invention is now described in closer detail in connection with a preferred embodiment and with reference to the accompanying drawings, in which

[0010] FIG. 1 shows part of a trolley as a perspective view obliquely from above;

[0011] FIG. 2 shows the trolley seen in FIG. 1 as a perspective view obliquely from below; and

[0012] FIGS. 3a and 3b show arranging a pretension of the second support point.

DETAILED DESCRIPTION OF THE INVENTION

[0013] With reference the to figures in the drawings, they show an essential part of the trolley 1, associated with the present invention. It comprises a trolley to body, of which a load beam 2, only, in the transverse direction of the trolley 1 is shown. Other body parts related to the load beam 2 and not shown do not bear an essential meaning from the viewpoint of the invention.

[0014] The trolley 1 shown in the drawings further comprises a hoisting mechanism 3 which is supported to the trolley body 2 and comprises a rope drum 4 for at least one hoisting rope (not shown), a hoisting motor 5 for driving the rope drum, and a gear 6 for coupling the hoisting motor 5 to the rope drum 4.

[0015] The gear 6 has a primary side coupled to the hoisting motor 5 and a secondary side coupled to the rope drum 4, whereby the rope drum 4 is located, as seen in the vertical direction of the trolley 1, between the hoisting motor 5 and the load beam 2 parallel to the load beam 2.

[0016] The essential matter in the present invention is that the hoisting mechanism 3 is supported by a three-point support A, B, C to the main beam 2, whereby the first support point A and second support point B are located adjacent to the secondary side of a gear 6 so that the first support point A is higher on the main beam 2 and the second support point B is lower on the main beam 2 at a distance from the first support point A, and whereby the third support point C is formed by a support of the rope drum 4 end facing away from the gear 6 to the load beam 2 at a lateral distance from the first and second support point A, B.

[0017] At the first support point A, the movement of an installation flange 7 of the gear 6 in the vertical, longitudinal, and transverse directions is prevented, but rotation is allowed, i.e. in the XYZ coordinate system, shown in the drawings, movements in the X, Y, and Z directions are prevented whereas rotation in these direction is free. At the second support point B, the movement of the gear 6 in the direction towards the load beam 2 is prevented, but movement in the longitudinal and vertical direction of the load beam 2 as well as rotation allowed, i.e. movement in said coordinate systems in the Y direction is prevented, but allowed in X and Z directions, rotation in all the directions being free. The support point B forms a moment support of the gear, whereby depending on this support, the distance of the resultant of the rope force causes compression or traction towards the load beam 2. At the third support point C, the movement of the rope drum 4 end facing away from the gear 6 in the vertical direction and towards the load beam 2 is prevented, but movement in the longitudinal direction of the load beam 2 and rotation are allowed, i.e. movements in the Y and Z directions, only, are prevented, but free in the X direction are free, rotation in all the directions being free. The gravitational force F.sub.g and on the line SL between the support points the resultant of the support moments Mm=F.sub.g×SLF.sub.g and M.sub.f=F.sub.r×SLF.sub.r caused by gravity and rope force defines the magnitude and direction (compression or tractive force) of the force directed to the support point B.

[0018] The hoisting mechanism 3 advantageously comprises a vertical installation flange 7 fastened to the flank of the gear 6, whereby the first support point A comprises a first lug 8 on the vertical side 2a of the load beam 2, in its top part, to which lug the top part of the installation flange 7 is supported by means of a pin and ball joint 10 in the longitudinal direction of the load beam 2, which are installed through openings 9 in the top part of the installation flange 7 and the first lug 8. The second support point B comprises a second lug 11 on the vertical side 2a of the load beam 2, in its bottom part, which has a vertical opening 12 to which a support protrusion 13 formed in the bottom part of the installation flange 7 extends. Obviously, the aforementioned installation flange 7 may also be part of the casing of the gear 6. The third support point C comprises a third lug 14 on the vertical side 2a of the load beam 2, at the rope drum 4 end facing away from the gear 7, to which the end Xs of the shaft X of the rope drum 4 is supported.

[0019] With reference to FIG. 3a, there is arranged in the second lug 11 a horizontal pretension, towards the vertical side 2a of the load beam 2, With this, traction is converted into compression at the support point B. In addition, between the vertical side 2a of the load beam 2 and the second lug 11 there is arranged a slide surface 14 which may be arranged between the second lug 11 and the vertical side 2a of the load beam 2. In the pretension, a flexible element 15 between a tensioning surface of the lug 11 and the support protrusion 13, the flexible element in FIG. 3a being shown in a compressed state. An uncompressed state of the flexible element 15 is shown in FIG. 3b.

[0020] Alternatively, the aforementioned installation flange 7 may be part of the casing of the gear 6.

[0021] The above description of the invention is only intended to illustrate the basic idea of the invention. A person skilled in the art may thus vary the details of the invention within the scope of the attached claims.