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EP-3724122-B1 - FRAME STRUCTURE OF HOIST

EP3724122B1EP 3724122 B1EP3724122 B1EP 3724122B1EP-3724122-B1

Inventors

  • LÄHTEENMÄKI, Atte
  • LINDBERG, TEPPO
  • JUTILA, Mikko
  • RITALA, MIKKO
  • MYKRÄ, Mikko
  • Helkiö, Henri
  • KOKKO, Henri
  • Laukkanen, Niko

Dates

Publication Date
20260513
Application Date
20181212

Claims (10)

  1. A frame structure of a hoist, the frame structure (1) comprising a support frame structure (2), suspenders (4) comprising an upper part (16), a middle part (17), and a lower part (18), a bearing wheel arrangement (3) fastened to the support frame structure (2) by said suspenders (4) to support the hoist on a main support structure (12) and to move the hoist on the main support structure (12), whereby the bearing wheel arrangement (3) comprises, in the movement direction of the hoist, bearing wheels (5) arranged on opposite sides thereof, and upper sheave arrangements (6) secured to the support frame structure (2),wherein the support frame structure (2) comprises two plates (7) arranged opposite to and at a distance from each other by spacers (15), the upper parts (8) of the plates bent towards each other, and in the support frame structure (2) there is arranged an axle (10) passing through both plates (7), on which axle (10) a sheave (11) is arranged between the plates (7), a fastening point (13) is arranged to the middle part of the plate (7) of the support frame structure for a hoisting rope, the lower part (18) is arranged on the inside of the support frame structure (2), and the middle part (17) and upper part (16) protrude from a gap (9) formed between the bent upper parts (8) of the plates (7) of the support frame structure, the bent upper parts (8) of the plates are detachably fastened by a wedge locking (29) or by a bolt locking (30) to the lower part (18) of the suspender (4) between the spacers (15) and the bent upper parts (8) of the plates in order to adjust the mutual distance (s) between the bearing wheels (5) arranged on opposite sides of the support frame structure (2) by means of the suspenders (4).
  2. A frame structure of a hoist as claimed in claim 1, characterised in that the upper part (8) of the plate is bent into a substantially horizontal plane.
  3. A frame structure of a hoist as claimed in either claim 1 or 2, characterised in that the plate (7) of the support frame structure is bent in such a way that the plate is substantially L-shaped, and the plates (7) of the support frame structure are mirror image profiles of each other.
  4. A frame structure of a hoist as claimed in any one of claims 1 to 3, characterised in that there is arranged a joining point (14) to the middle part of the plate (7) of the support frame structure for a rope drum of a hoisting rope.
  5. A frame structure of a hoist as claimed in any one of claims 1 to 4, characterised in that the two plates (7) of the support frame structure are arranged opposite to and at a distance from each other by means of bushings.
  6. A frame structure of a hoist as claimed in any one of claims 1 to 5, characterised in that the suspender (4) connects to the bearing wheel arrangement (3) by an axle joint (28).
  7. A frame structure of a hoist as claimed in claim 6, characterised in that the suspender (4) connects by its middle part (17) to the bearing wheel arrangement (3) by a screw joint (19).
  8. A frame structure of a hoist as claimed in claim 1, characterised in that there are upper reinforcement plates (22) fastened to the middle part (17) of the suspender (4), and the lower part (18) of the suspender (4) comprises a lower reinforcement plate (23) and wedge parts (24) thereon, and the bent upper part (8) of the plate (7) of the support frame structure is arranged between the upper reinforcement plate (22) and the wedge parts (24).
  9. A frame structure of a hoist as claimed in any one of claims 1 to 8, characterised in that the bearing wheel arrangement (3) comprises on opposite sides of a hoist, at all times at least two arranged bearing wheels (5), and the bearing wheels (5) on the same side of the hoist are at any one time arranged on the same suspension part (26) which is fastened by the suspender (4) to the support frame structure (2).
  10. A frame structure of a hoist as claimed in any one of claims 1 to 8, characterised in that the bearing wheel arrangement (3) comprises, in the movement direction of the hoist, trolley flanges (27) arranged on opposite sides thereof and having bearing wheels (5).

Description

Background of the invention The invention relates to a frame structure of a hoist, the frame structure comprising a support frame structure, a bearing wheel arrangement fastened to the support frame structure by suspenders to support the hoist on a main support structure and to move the hoist on the main support structure, whereby the bearing wheel arrangement comprises, in the movement direction of the hoist, bearing wheels arranged on opposite sides thereof, and the frame structure comprises upper sheave arrangements, secured to the support frame structure. A crane type often used in industry is a bridge crane which consists of a bridge running on a rail or rails, a trolley running on the bridge, and a hoist for a load, fixed to the trolley. The hoist of a bridge crane is typically a rope crane. It is important for the usability of a crane that it makes efficient use of the available working space. A rail support assembly for a crane is disclosed in US6499408B1, and a frame structure of a hoist is disclosed in FR2590881A1, for instance. The frame structure in US6499408B1 comprises a support frame structure with two plates, suspenders comprising an upper part, a middle part, and a lower part, a bearing wheel arrangement fastened to the support frame structure by said suspenders. In such a case, it is advantageous for the structure of the hoist to be such that it allows hoisting a load as high as possible, using the available free height. However, the structure of the hoist needs to be economical to manufacture and reliable. From the point of view of the installability and maintainability of the hoist, it is important that the structure of the hoist allows the hoist to be adapted on a bridge, main support structure, in a simple and fast manner. Brief description of the invention An object of the invention is thus to develop a structure of a hoist so that the aforementioned problems may be solved. The object of the invention is achieved by a hoist structure according to the independent claim. Preferred embodiments of the invention are disclosed in the dependent claims. The invention is based on a frame structure of a hoist, the frame structure comprising a support frame structure, a bearing wheel arrangement fastened to the support frame structure by suspenders to support the hoist on a main support structure and to move the hoist on the main support structure, whereby the bearing wheel arrangement comprises, in the movement direction of the hoist, bearing wheels arranged on opposite sides thereof, and upper sheave arrangements, secured to the support frame structure. The support frame structure comprises two plates arranged opposite to and at a distance from each other, the upper parts of the plates bent towards each other, and in the support frame structure there is arranged an axle passing through both plates, on which axle a sheave is arranged between the plates, and the bent upper parts of the plates are detachably fastenable by a wedge locking to the suspender in order to adjust the mutual distance between the bearing wheels arranged on opposite sides by means of the suspenders. The advantage of the inventive frame structure of a hoist is the small height dimension, allowing hoisting a load as high as possible, making use of the available free height. The structure of the hoist allows the hoist to be adapted on the main support structure in a simple and fast manner. Brief description of the drawings The invention will now be described in more detail in connection with preferred embodiments and with reference to the accompanying drawings, in which: Figure 1 shows a frame structure of a hoist;Figure 2 is a top view of the frame structure of a hoist of Figure 1,Figure 3 is a front view of the frame structure of a hoist of Figure 1,Figure 4 is a side view of the frame structure of a hoist of Figure 1,Figure 5 is a side view of the frame structure of a hoist;Figure 6 shows a suspender;Figure 7 shows the suspender of Figure 6; andFigure 8 shows another embodiment of a suspender which may be used in the frame structure of a hoist of Figures 1-5. Detailed description of the invention The frame structure 1 of a hoist may be used, for example, in a trolley of a bridge crane. The trolley moves along a main support structure of a crane. The main support structure typically comprises a profile beam whereby the trolley is supported on a lower flange of the profile beam. So, a main support refers to a supporting structure which, at its simplest, is one beam and in most cases an I beam. The hoisting arrangement of a rope hoist is arranged in a trolley. Figures 1 to 5 show a frame structure 1 of a hoist. The frame structure 1 of a hoist comprises a frame support structure 2, a bearing wheel arrangement 3, and suspenders 4. The bearing wheel arrangement 3 is fixed to the support frame structure 2 by the suspenders 4 to support the hoist on the main supports structure and to move the hoist on the main support structure.