EP2210849A1 - Double chain hoist assembly - Google Patents

Abstract

The hoist assembly has a load chain (35) guided from a chain sprocket group (39) to a hook block (5) and to a load chain fixing point. Another load chain (36) is guided from the group to a deflection chain sprocket (42) and to another hook block (6) and from the later block to another chain sprocket group (44) by another deflection chain sprocket (43). An adjusting chain (38) is passed around the latter sprocket group and a third deflection chain sprocket (27) at adjacent ends of a transverse section. Ends of the adjusting chain are attached to an adjusting chain fixing point (48).

Description

Wide-spreading loads or kink-sensitive loads can not be lifted with a single hook and straps. Such loads require attaching to a cross member from the straps or other load suspension devices hang down to pick up the load. This method is widely used, but has the disadvantage that the traverse, depending on the dimensions of the load, must be replaced with another traverse.

Alternatively, it is also known to perform chain hoists as so-called double chain hoists in which hang on a cross-beam two chain hoists. These two chain hoists are operated for synchronization reasons usually via a drive motor.

A disadvantage of such chain hoists is the fixed distance between the hooks, which may be too small or too large. In order to tune to the size of the load then traverses must be used again at the height of the hooks or pull ropes to increase or decrease the distance of the hooks according to the dimensions of the load.

Another disadvantage of such double chain hoists results from the Anfahrmaß, ie the smallest distance that can have the hook of a building wall when the double chain hoist is moved in the direction of the wall. If the hooks are pulled toward each other by appropriate measures clearly the starting dimension.

Based on this, it is an object of the invention to provide a double chain, in which the hook spacing is variable, the Anfahrmaß remains constant.

This object is achieved by a double chain with the features of claim 1.

The new double chain hoist has a traverse that can be adjusted in length. The traverse is composed of a first and a second truss section, which are telescopically movable against each other. Each truss section or Traversenteleskopstück has a distal or distal end, as well as a proximal or the other truss section facing the end.

In addition to the distal end of the first truss section, a first chain nut group of two coaxial and non-rotatably connected chain nuts is provided. Furthermore, the first truss section is provided with a load chain fixed point next to the first sprocket group and a Verstellkettenfixpunkt. The first truss section is further associated with a first hook hook. The second truss section has a second sprocket group, which is arranged axially parallel to the first sprocket group. This second chain nut group also has two coaxially arranged and non-rotatably connected chain nuts. This second chain nut group is located at the distal or distal end of the second truss section. In addition, the second truss portion comprises two axially parallel adjacent Umlenkkettennüsse for one of the load chains on which the second hook bottle hangs. Another Umlenkkettennuss for an adjustment chain is located at the proximal or inner end of the second truss section.

Each of the two hook bottles is assigned its own load chain. The first load chain travels from the first crawler group to the first hook block and from there to the load chain break point on the first truss section. The other load chain leads from the first chain-nut group to the axially parallel chain nuts in the second truss section, from there to the hook block, from the hook block back over the other chain nut of this deflection group to the second chain nut group at the distal end of the second truss section.

An adjusting chain leads around the still free chain sprocket of the second chain nut group and the Umlenkkettennuss at the proximal end of the second truss section around. Their two free ends are anchored to Verstellkettenfixpunkt the first truss section.

Since the two truss sections are telescopically adjustable, depending on the application, the hook bottles can be moved toward or away from each other. Within the possible Verstellhubs thus each hook spacing can be set arbitrarily. The adjustment is made by turning the second chain nut group in revolutions. As a result, the two truss sections are moved against each other. At the same time the second load chain is effectively shortened according to the adjustment. The second chain nut group thus forms, as it were for the second load chain, a virtual fixed point, which picks up or releases chain according to the adjustment, so that the second Hook bottle remains independent of the adjustment at the same height that they had already held before the adjustment. As a rule, both hook bottles are at the same height. In certain applications, it may also be useful to adjust the heights against each other, this height adjustment is not affected by the adjustment of the truss width.

A close examination of the forces shows that the force in the second load chain is the same as the force in the adjustment chain. Both chain forces, however, have opposite signs, so that finally the second chain nut group is virtually torque-free to the outside. It can therefore be used to adjust the truss length a drive device which is dimensioned substantially weaker in terms of vomiting torque, as the drive means for the first chain nut group.

The chain nuts of the first chain nut group and the chain nuts of the second chain nut group may have the same number of chain pockets.

It is expedient if only the chain nuts within a chain-nut group have the same number of chain pockets so that the chain running over the respective chain-nut group or the corresponding run of the chain runs at the same speed.

In order to prevent tangling of the empty trimmings of the load chains, it is expedient if two chain storage pockets are provided in addition to the first chain nut group.

Each truss section may be provided near its distal end with a chassis, so that the double chain hoist is movable along a running rail. The running rail can be the crane bridge of a bridge crane.

At least one of the trolleys can be provided with a motor. If appropriate, it is expedient to provide only one landing gear motor, so that the adjustment of the truss length is not hindered by the respective landing gear motor.

In order to fix the setting, a braking device is expediently assigned to the second chain nut group. If a conventional drive is used to drive the second chain nut group, as it is also used for hoists in chain hoists, the braking device is already structurally contained in the drive system.

Incidentally, developments of the invention are the subject of subclaims. The following description of the figures explains aspects for the understanding of the invention, further, not described details, the expert can refer to the figures in the usual way, the extent to complement the description of the figures. It is clear that a number of modifications and combinations are possible.

The following figures are not necessarily to scale. To illustrate details, certain areas may be exaggerated in size, moreover, the drawings are simplistically simplified and do not include every detail that may be present in the practice. The terms "top" and "bottom" or "front" and "back" and "left" and "right" refer to the normal position of use or the terminology for lifting equipment.

Fig. 1

zeigt in einer vereinfachten perspektivischen und teilweise aufgebrochenen Ansicht einen erfindungsgemäßen Doppelkettenzug.

Fig. 2

zeigt einen Querschnitt durch die Traversenanordnung des Doppelkettenzugs nach Fig. 1.

Fig. 3

zeigt, stark schematisiert, den Verlauf der einzelnen Ketten über die Ketten- und Umlenknüsse.

Fig. 4

veranschaulicht in einer geschnittenen Seitenansicht, das, bezogen auf Fig. 1, linke Ende des Doppelkettenzugs.

Fig. 5

zeigt einen Blick von oben auf das rechte Ende des Doppelkettenzugs nach Fig. 1.

In the drawing, an embodiment of the object of the invention is shown.

Fig. 1

shows in a simplified perspective and partially broken view of a double chain hoist according to the invention.

Fig. 2

shows a cross section through the truss assembly of the double chain hoist after Fig. 1 ,

Fig. 3

shows, highly schematized, the course of the individual chains on the chain and Umlenknüsse.

Fig. 4

illustrated in a sectional side view, which, based on Fig. 1 , left end of the double chain hoist.

Fig. 5

shows a view from above on the right end of the double chain hoist Fig. 1 ,

In Fig. 1 a double chain hoist 1 is illustrated. The double chain hoist 1 has as main assemblies two carriages 2, 3, a length-adjustable cross member 4 and two hook bottles 5, 6 with hooks attached thereto.

Like the synopsis of the Fig. 1 and 2 can recognize, the chassis 2 has two mutually parallel chassis shields 7a and 7b. The chassis plate 7a carries two rotatably mounted flange wheels 8a and 8b. Mirror images of the flange wheels 8a and 8b are on the opposite flange of the chassis plate 7b provided corresponding flange wheels.

The two chassis shields 7a and 7b are screwed on spacers 9a and 9b with corresponding tabs 11a and 11b by means of through bolts 12. Per chassis 2, the two shields 7a and 7b with two such sets of spacers 9a, 9b and screws 12 are secured to the cross member 7.

The structure of the chassis 3 corresponds to the design of the chassis 2, which makes a further explanation unnecessary.

One of the two carriages 2, 3, is also provided with a drive motor to drive one or the one pair of wheel flanges 8a, 8b in order to move the double chain hoist 1 along a crane bridge.

The traverse 4 is composed of two truss sections 13 and 14, which are telescopically adjustable against each other in the longitudinal direction.

The truss section 13 contains for this, as Fig. 2 can detect, extending in the cross-member longitudinal Z-shaped profile rail pieces 15, 16, each comprising a short leg or flange 17, a central portion 18 and an outwardly facing leg or flange 19. The Z-profile rail pieces 15, 16 are arranged so that they form a downwardly open U. In the region of their short mutually facing legs 17, which extend horizontally, they are connected to one another by corresponding fastening plates 20 in the region of the chassis 2. The two Z-profile rail pieces 15, 16 are parallel to constant Distance from each other. The lower flanges 17, 19 lie in a common horizontal plane

Thus, the two Z-profile rail pieces 15, 16 are connected at one end via the chassis 2 and at the other end by a plate corresponding to the plate 20.

The truss section 14 form two parallel spaced-apart U-profile rail pieces 21, 22, according to Fig. 2 are arranged.

Each U-profile rail piece 21, 22 is composed of two mutually parallel short legs 23, 24 and a back portion 25 together. The back portions 25 are facing each other.

In the area of the chassis 3, the U-profile rail pieces 21, 22 are connected in a similar manner as the Z-profile rail pieces 15, 16. The type of connection is known in the art and therefore need not be further explained at this point.

At the remote from the chassis 3, based on the double chain 1 proximal end of the two U-profile rail pieces 21, 22 are interconnected by an axis 26, on the freely rotatable two chain nuts 27 and 28 are arranged. In addition, in addition to the chain nuts 27, 28 still be a rigid connector inserted.

The slidable connection between the truss portion 13 and the truss portion 14 is achieved with groups of deep groove ball bearings 29, 30 which sit on rigid axles 31, 32. The rigid axles 31, 32 are, as shown, connected to the center piece 18 of the Z-profile rail piece 16 and are perpendicular to this. On the inside of the leg 18, the two deep groove ball bearings 29, 30 are arranged one above the other at a distance from each other, in such a way that they bear against the inside of the short legs 23, 24 of the U-profile rail piece 21. Mirror images of the deep groove ball bearings 29, 30 on the left side are on the other side, the right side, also arranged one above the other deep groove ball bearings, which cooperate with the U-profile rail piece 22.

Of this type of storage described there are along the cross member 4 at least one other set of four pieces, namely in alignment with the described storage on the opposite side between the Z-profile rail piece 15 and the U-profile rail piece 22 and at a distance in the direction of the Chassis 3 again at least two such groups, so that over the entire adjustment stroke of the truss section 13 is mounted longitudinally displaceable with the truss section 14 via at least eight ball bearings. With the aid of the bearing thus described, the truss section 14 can be displaced in the groove-like cavity between the two Z-profile rail pieces 15, 16 in the longitudinal direction. Thus, the distance between the chassis 2, 3 is increased and decreased accordingly and, as is clear from the broad description, and the distance between the hook or hook bottles 5, 6th

Fig. 3 shows in a schematic representation of the chain course within the double chain hoist 1, wherein only the chain nuts are illustrated, while all support members are omitted for holding the chain nuts.

The double chain hoist 1 has according to Fig. 3 two load chains 35, 36 and an adjustment chain 37. All chains 35, 36, 37 are round link chains and have the same geometry. To drive the two load chains 35, 36, a drive motor 37 is on the transmission output shaft two chain sprocket 39 forming chain nuts sit. The pancakes belonging to the sprocket group 39 are, as the schematic drawing of Fig. 3 can recognize, arranged coaxially and rotatably connected to each other. They have the same number of pockets. For reasons of space, this chain nut group 39 is located slightly below the traverse 4.

Within the truss section 13 and below the chassis 2, two loose Umlenkkettennüsse 40 and 41 are rotatably mounted in the truss section 13. The two chain nuts 40 and 41 are arranged coaxially with each other, but independently rotatable. The load chain 35, which is driven via the sprocket group 39, leads from the associated sprocket of the sprocket group 39 to the Umlenknuss 40 and from here vertically down to the hook bottle 5. Starting from the hook bottle 5, the load chain 35 leads back up to the Traversal section 13. Its free end is anchored to a chain fixing point 42 on the underside of the truss section 13.

The load chain 36 leads from the other of the two chain nuts of the sprocket group 39 via the Umlenkkettennuss 41 in the space between the two U-profile rail pieces 21 and 22 in the truss section 14. Below the chassis 3 are parallel to the axis and at a distance to each other in the truss section 14 two Umlenkkettennüsse 42 and 43 rotatably mounted. The load chain 36 leads from the Umlenkkettennuss 41 coming to the Umlenkkettennuss 42 around down from the truss section 14 out.

Coming from the Umlenkkettennuss 42, the load chain 36 leads through the hook block 6 and back up towards the truss section 14. Within the truss section 14 runs the load chain 36 coming from the hook bottle 6 to the Umlenkkettennuss 43 to another Kettennussgruppe 44 at the other end Traverse 4. The chain nut group 44 has two mutually coaxial and non-rotatably connected chain nuts. Chain nuts of the chain nut group 44 have the same number of chain pockets. Preferably the same number as the Kettennussgruppe 39. However, this is not necessary. The chain nut group 44 is located next to the chassis 3.

The slack side of the load chain 36, which forms following the sprocket group 44, leads into a chain pocket, which is arranged below the chassis 3.

In order to minimize the slack of the load chain 36 within the traverse 4, the load chain 36 is additionally on the loose rotatable sprocket 28 on. The sprocket 28 is in Fig. 3 not shown for reasons of clarity. It is located between the sprocket group 39 and the Umlenkkettenuss 42 at the distal end of the truss portion 14th

The sprocket assembly 44 sits on the output shaft of a geared motor 45 which is internally provided with a braking device, as is typical for chain hoists. The braking device therefore need not be further explained at this point.

Once the Kettennussgruppe 44 is fixed, this acts as a chain fix point for the load chain 36. By setting the Kettennussgruppe 39 using the geared motor 38, the two load chains 35 and 36 are moved synchronously by the same displacement. Since the free ends of the two load chains are fixed to the fixed point 42 or the chain nut group 44, the two hook bottles 5, 6 move in the same direction and in terms of amount by the same stroke. Both hook bottles 5, 6 can apply the same force.

The adjusting chain 38 is attached at one end to a fixed point 48, which sits on the truss section 13 at its distal end and projects between the two U-profile rails 21, 22 of the truss section 14. From this fixed point 48, the load chain leads to the Umlenkkettennuss 27, which at the distal end of the truss portion 14, as in Fig. 2 shown, between the two U-profile rails 21, 22 is freely rotatably mounted. After a 180 ° deflection around the sprocket 27, the adjusting chain 38 runs to the associated sprocket of the sprocket group 44 and around it back to the fixed point 48th

Regardless of the operation of the load chain 36 performs an adjustment of the sprocket group 44 in the clockwise direction, based on Fig. 3 to that the fixed point 48 is used to the sprocket group 44. This means that the two truss sections 13, 14 migrate toward each other. A rotation of the chain nut group 44 in the counterclockwise direction, however, pulls the fixed point 48 in the direction of the Umlenkkettennuss 27, whereby the distance between the briefcases 5, 6 is increased.

For further explanation, it is now assumed that the double chain hoist 1 assumes a position as in Fig. 3 is drawn schematically. If, in this position, the sprocket group 44 is moved in the clockwise direction, as discussed above, the fixed point 48 is used for the chassis 3, ie the hook block 5 below the chassis 2, the existing there over the fixed point 42 and the Umlenkkettennuss 40 with the truss section 13th As a result of this movement, the chain piece of the load chain 36 between the Umlenkkettennuss 41 and the Umlenkkettennuss 42 would be too long per se. However, because the sprocket assembly 44 carries a second sprocket for the load chain 36, as the two 13, 14 approach, the double chain sprocket 44 clears the excess portion of the load chain 36 through the spreader bar and across the double chain sprocket 44 transported. When adjusting runs so to speak, the load chain 36 through the hook bottle 6 through, which leads to the fact that ultimately the hook bottle 6 remains at the height shown, regardless of how the distance between the hook bottles 5, 6 is set. For the reverse movement, the same applies mutatis mutandis with opposite signs, ie, when the truss sections 13, 14 are moved apart, additional load chain 36 is needed between the sprocket group 39 and the running away sprocket 42. This is transported by means of the sprocket group 44 when putting the motor 45 from a corresponding memory, which is located below the sprocket group 44, in the traverse 4.

In other words, that in Fig. 3 Trumm lying above the Verstellkette 38 performs the same stroke with the same direction of movement, as the load chain 36 between the Umlenkkettennuss 43 and the sprocket group 44.

As can easily be seen, it is functionally only necessary that the sprocket group 44 has two chain nuts, namely one for the adjusting chain 38 and one for the load chain 36. To achieve the operating condition it is sufficient if these two chain nuts have the same number of chain pockets. The sprocket group 44 must by no means coincide with the sprocket group 39 with regard to the chain pockets per sprocket. For manufacturing reasons, however, it is advantageous if both Kettennussgruppen are identical.

A consideration of the forces shows, moreover, that the drive motor 45 can be much smaller dimensioned than the drive motor 38. A hanging on the hook block 6 load strives to the chain portion of the load chain 36 between the Umlenkkettennuss and the Kettennussgruppe 44 to the left, related on Fig. 3 to pull. This produces counterclockwise torque on the sprocket assembly 44. At the same time, this force strives to move the two truss sections 13, 14 towards each other. In the adjusting chain 38, however, the force acts in the opposite direction due to the torque introduced, ie a torque of the chain nut group 44 in the counterclockwise direction sets the lower run of the adjusting 38 under tension, so that the adjusting chain 38 endeavors the fixed point 48 away from the sprocket group 44 to draw. In other words, the longitudinal forces cancel each other out in the area of the sprocket group 44 and it suffices to provide a drive for the drive of this sprocket group, which is only capable of applying the adjustment forces and which has a low braking effect, and thus not by asymmetries as a result of friction, an undesirable adjustment comes about.

Only for the sake of completeness, a few details on the structural design of the drives are made below.

1. 1. Die Darstellung ist längs der vertikalen Mittelebene parallel zu der Traverse 4 geschnitten. Wie zu erkennen ist, sitzt auf einer zwischen den Z-Profilschienen 15 und 16 auf einer zwischen diesen gehalterten Achse 51 die Kettennuss 40. Die andere Kettennuss 41 ist wegen der geschnittenen Darstellung nicht zu erkennen. Die Kettennuss 40 wird teilweise von einem Kettenführungsteil 52 umgeben, das an dem Schenkel 18 der Z-Profilschiene 15 befestigt ist.

Fig. 4 shows the left-hand end of the double chain hoist

1. 1. The illustration is cut along the vertical median plane parallel to the traverse 4. As can be seen sitting on one between the Z-profile rails 15 and 16 on a content Erten therebetween axis 51, the sprocket 40. The other sprocket 41 is not visible because of the sectional view. The sprocket 40 is partially surrounded by a chain guide member 52 which is secured to the leg 18 of the Z-profile rail 15.

Below the sprocket 40 is a chain guide plate 52 which includes flush with the trays of the load chain 35 aligned openings 53 and 54.

To the left side extends an obliquely downwardly angled arm 55 to which the drive 38 is attached. The drive 38 comprises a drive motor 56 which drives a transmission output shaft 57 via a transmission. On the transmission output shaft sitting axially parallel to each other, the two belonging to the sprocket group 39 chain nuts. Of these, due to the cut representation, only the chain sprocket 58, which is behind the viewing side, can be seen around which the load chain 35 guides.

The sprocket group 39 is surrounded by a sprocket housing 59, the corresponding chain guide channels 59 for the contains two load chains 35 and 36.

The chain guide channel 60 of the load chain 35, as the figure can be seen, obliquely downwards. Below the mouth of the chain guide channel 60 is a chain storage pocket 61.

A further chain storage pocket corresponding to the chain storage pocket 61 would be conceivable above the drawing plane, as would the chain nut belonging to the load chain 36, the chain nut group 39.

The other end of the chain guide channel 60 is arranged so that the chain without kink of the sprocket 57 leads to the Umlenkkettennuss 40.

The free end of the load chain 35 is anchored in the plate 52 in the opening 53. This opening simultaneously forms the fixation point 42.

Fig. 5 shows a plan view of the right end of the double chain hoist 1, and cut approximately at the height of the axis of the guide ball bearings 29. As can be seen, sit on two mutually parallel axes 63 and 64, the two Umlenkkettennüsse 42 and 43. In the gap between these chain nuts the load chain 36 dives down perpendicular to the plane, while the adjustment chain 37 laterally beside the two chain nuts 42 and 43 passes. At the right free end of the drive motor 45 is seated on the transmission output shaft 65 sitting next to each other rotatably two chain nuts 66 and 67, which form the Kettennussgruppe 44.

A double chain hoist has a telescopically extendable and collapsible crossbeam, with load chains leading to hook hooks below them leading near the ends of the two telescopic pieces belonging to the traverse. By means of another chain, the distance between the telescopic pieces can be varied. The chain for varying the length of the traverse runs over a sprocket with the rotatably connected to another sprocket nut, which serves as the fixed point for that load chain for the hook bottle of the relevant Traversenteleskopstücks.

Claims (14)

Doppelkettenzuganordnung
with a longitudinally adjustable crossmember (4), which has a first and a second crossbar section (13, 14), which are connected to one another in a longitudinally displaceable manner, each crossbar section (13, 14) being connected to the other crossbar section (13, 14) ) adjacent and one from the other truss portion (13,14) end remote,
with a first chain nut group (39) of two coaxial and non-rotatably interconnected chain nuts, which are rotatably mounted at the distal end of the first truss portion (13),
with a load chain fixing point (42) adjacent to the first chain nut group (39),
with a Verstellkettenfixpunkt (48) which is provided at the adjacent end of the first truss portion (13),
with a first hook block (5) associated with the first truss section (13),
with a second chain nut group (44) of two coaxial and non-rotatably interconnected chain nuts, which are rotatably mounted at the distal end of the second truss portion (14) and which are axially parallel to the first chain nut group (39),
with two spaced-apart Umlenkkettennüssen (42,43), which are arranged axially parallel to the first Kettennussgruppe (39) and on the second truss portion (14) in the vicinity of the second Kettennussgruppe (44),
with a Umlenkkettennuss (27) at the adjacent end of the second truss portion (14),
with a second hook block (6) associated with the second truss section (14),
with a first load chain (35) leading from the first chain gear group (39) to the first hook block (5) and from there to the load chain fixing point (42),
with a second load chain (36) extending from the first chain nut group (39) to one of the two Umlenkkettennüsse (42), from there to the second hook bottle (6) and from the second hook bottle (6) via the second Umlenkkettennuss (43) the second chain nut group (44) leads,
an adjustment chain (38) which guides around a sprocket of the second sprocket assembly (44) and around the sprocket (27) at the adjacent end of the second spine portion (14) and whose ends are secured to the adjustment chain tie point (48). Doppelkettenzuganordnung according to claim 1, characterized in that the chain nuts of the first chain nut group (39) have the same number of chain pockets. Doppelkettenzuganordnung according to claim 1, characterized in that the chain nuts of the second chain nut group (44) have the same number of chain pockets. Doppelkettenzuganordnung according to claim 1, characterized in that in addition to the first chain nut group (39) has two chain storage pockets (61) are provided. Double chain hoist according to claim 1, characterized in that besides the second chain nut group (44) only one chain storage pocket is present. Doppelkettenzuganordnung according to claim 1, characterized in that the second chain nut group (44) is associated with a braking device. Doppelkettenzuganordnung according to claim 1, characterized in that each chain nut group (39,44) is associated with its own drive motor (38,45). Doppelkettenzuganordnung according to claim 1, characterized in that the drive motor (45) of the second Kettennussgruppe (44) in terms of the drive torque is dimensioned smaller than the drive motor (38) of the first Kettennussgruppe (39). Doppelkettenzuganordnung according to claim 1, characterized in that each truss section (13,14) is provided with a chassis (2,3). Doppelkettenzuganordnung according to claim 1, characterized in that the chassis (2,3) adjacent to the distal end of the respective truss portion (13,14) is located. Doppelkettenzuganordnung according to claim 1, characterized in that at least one of the chassis (23) is provided with a chassis motor. Doppelkettenzuganordnung according to claim 1, characterized in that the first chain nut group (39) below the first truss portion (13) is arranged and that at the height of the first truss portion (13) for the first and the second load chain (35,36) each Umlenkkettennüsse (40,41) are provided. Doppelkettenzuganordnung according to claim 1, characterized in that the first traverse section (13) has two parallel juxtaposed Z-profile rail pieces which define a downwardly open channel. Doppelkettenzuganordnung according to claim 1, characterized in that the second truss portion (14) has two parallel juxtaposed U-profile rail pieces, which are arranged back to back (25) and between which the chains (36,38) extend.

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