Stabilizing device for preventing lifting appliance from overturning, lifting appliance and crane

Abstract

The utility model relates to the technical field of hoisting equipment, and discloses a stabilizing device for preventing a lifting appliance from overturning, the lifting appliance and a crane. The stabilizing device comprises a fixing frame and a plurality of rotating rollers, the rotating rollers are rotationally installed on the fixing frame in pairs, the two rotating rollers in pairs are arranged in parallel at intervals in the first horizontal direction, the axes of the rotating rollers are parallel to the second horizontal direction, and the first horizontal direction is perpendicular to the second horizontal direction. A swing interval is formed by the interval between the two rotating rollers in pair, and the swing interval is used for allowing a lifting rope of the crane to move. When the lifting appliance is inclined, the rotating roller can generate a stable moment to enable the lifting appliance to recover a balanced state, the lifting rope can still continue to pull the lifting appliance to stably lift, the friction between the rotating roller and the lifting rope during action is rolling friction, the adverse effect on the lifting rope is reduced to the minimum, and the problem that the lifting rope is abraded by using an anti-inclination sleeve is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting equipment, in particular to a stabilizing device for preventing a sling from overturning, the sling, and a crane. Background Art

[0002] When using a traditional crane with a spreader for lifting, the rope is wound through a movable pulley block, and power needs to be transmitted one level at a time. Each mechanism through which the wire rope passes generates friction, making it impossible to guarantee synchronous lifting. When carrying a load, the heavy load ensures sufficient tension in the wire rope, allowing the rope to be fully tightened. The friction between the various mechanisms is minimal, so the spreader rarely tilts during loaded lifting. However, when the spreader is unloaded, the weight of the spreader is relatively light, and the wire rope cannot be fully tightened, causing the spreader to tilt to one side during lifting.

[0003] Since the sling is prone to overturning when it is unloaded, the wire rope will scrape against the movable pulley cover or the sling during unloaded lifting, which will affect the lifting and easily shorten the life of the wire rope, creating a safety hazard.

[0004] The existing technology uses an anti-tilt sleeve to limit the activity space of the wire rope. The anti-tilt sleeve and the wire rope are coaxially matched, which limits the five degrees of freedom of the wire rope, leaving only the freedom of the wire rope to rotate along the axis, which increases the internal stress of the wire rope and aggravates the wear of the wire rope. Utility Model Content

[0005] In view of the above-mentioned defects, the purpose of the present invention is to propose a stabilizing device, a sling and a crane for preventing the sling from overturning, thereby ensuring that the sling will not overturn during operation, effectively reducing the wear of the wire rope during use and extending the service life of the wire rope.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A stabilizing device for preventing a sling from overturning comprises a fixed frame and a plurality of rotating rollers, wherein the rotating rollers are rotatably mounted on the fixed frame in pairs, the two rotating rollers in a pair are spaced apart and arranged parallel to each other along a first horizontal direction, the axes of the rotating rollers are parallel to a second horizontal direction, the first horizontal direction and the second horizontal direction are perpendicular to each other, and the interval between the two rotating rollers in a pair forms a swing interval, which is used for moving the hoisting rope of a crane.

[0008] Specifically, it also includes a plurality of rotating shafts, the number of which is equal to the number of the rotating rollers, and the plurality of rotating shafts are respectively installed on the fixed frame, the axis of the rotating shaft is parallel to the second horizontal direction, and the outer periphery of each rotating shaft is respectively installed with a rotatable rotating roller through a bearing.

[0009] Preferably, the number of the rotating shafts is half the number of the rotating rollers, and several of the rotating shafts are respectively installed on the fixed frame. The axes of the rotating shafts are parallel to the second horizontal direction, and two rotatable rotating rollers are installed on the same rotating shaft through bearings.

[0010] Preferably, the fixed frame includes a base plate, a first bracket and a second bracket, the base plate is fixed to the sling, the first bracket and the second bracket are installed on the base plate, the first bracket and the second bracket are arranged opposite to each other, and two rotating shafts are arranged in parallel on the fixed frame, and the two ends of the rotating shaft are respectively connected to the first bracket and the second bracket.

[0011] Preferably, the two rotating rollers located on the same rotating shaft are defined as a first roller and a second roller, the first roller is close to the first bracket, the second roller is close to the second bracket, a shaft sleeve is provided between the first roller and the first bracket, a shaft sleeve is provided between the second roller and the second bracket, a shaft sleeve is provided between the first roller and the second roller, the gap between the first roller and the first bracket is smaller than the diameter of the external lifting rope, the gap between the second roller and the second bracket is smaller than the diameter of the external lifting rope, and the gap between the first roller and the second roller is smaller than the diameter of the external lifting rope.

[0012] A sling comprises a mounting frame, a hook and the above-mentioned stabilizing device, wherein the stabilizing device is installed on the top of the mounting frame, and the mounting frame is rotatably connected to a plurality of movable pulleys, and the movable pulleys are located directly below the stabilizing device.

[0013] Preferably, the vertical gap between the rotating roller and the top of the mounting frame is 10 to 50 mm.

[0014] A crane comprises a frame, a traveling device, a lifting drive, a drum, a lifting rope and the above-mentioned lifting device, wherein one end of the lifting rope is fixed to the frame, and the other end of the lifting rope passes through the swinging gap formed by two pairs of rotating rollers, passes around the corresponding movable pulley, passes through the swinging gap formed by another pair of rotating rollers, and then is fixedly wrapped around the drum.

[0015] Preferably, when the sling is in a normal lifting state, the horizontal gap d1 between each sling rope and any one of the two rotating rollers in its corresponding pair is 8-12 mm;

[0016] The minimum set distance of the horizontal distance d2 between any end of the rotating roller and the lifting rope when the sling is running under normal load is 50 mm.

[0017] Preferably, the material of the rotating roller is selected to have a hardness lower than that of the hanging rope. The technical solution provided by the utility model may have the following beneficial effects:

[0018] By using rotating rollers, the friction between the stabilizer and the rope is converted to rolling friction, significantly reducing the wear and tear on the rope caused by friction at the edges of the sling during use. This solves the problem of rope scratches caused by tilted slings. When the sling tilts, the rotating rollers generate a stabilizing torque to restore the sling to a balanced state, without restricting the rope's sliding, allowing the rope to continue to pull the sling smoothly up and down. The stabilizing device's rotating rollers are equipped with bearings, and the friction between the rotating rollers and the rope during operation is rolling friction, resulting in minimal wear. This structure only constrains the rope's movement in the horizontal direction perpendicular to the axis of the rotating rollers, leaving the remaining five degrees of freedom unconstrained. This minimizes the adverse effects on the rope and solves the problem of rope wear caused by the use of anti-tilt sleeves. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the working principle of a stabilizing device according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic structural diagram of a stabilizing device according to an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of the structure of the stabilizing device of two embodiments of the present invention.

[0022] Figure 4 This is a structural diagram of a sling according to an embodiment of the present invention.

[0023] Figure 5 This is a cross-sectional view of a stabilizing device according to an embodiment of the present invention.

[0024] Figure 6 Schematic diagram of the winding method of the suspension rope in the prior art.

[0025] Figure 7 It is a schematic diagram of the tilted state of the spreader in the prior art.

[0026] Among them: stabilizing device 1, rotating roller 11, first roller 111, second roller 112, rotating shaft 12, fixing frame 13, bottom plate 131, first bracket 132, second bracket 133, bearing 14, bushing 15, sling 2, mounting frame 21, hook 22, sling rope 3, first rope segment 31, second rope segment 32, third rope segment 33, fourth rope segment 34. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish between the described features, without distinction of order or importance.

[0029] In the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] The following describes embodiments of the present utility model in conjunction with the accompanying drawings.

[0032] A stabilizing device for preventing a sling from overturning comprises a fixed frame 13 and a plurality of rotating rollers 11, wherein the rotating rollers 11 are rotatably mounted on the fixed frame 13 in pairs, and the two rotating rollers 11 in a pair are spaced apart and arranged parallel to each other along a first horizontal direction, the axes of the rotating rollers 11 are parallel to a second horizontal direction, the first horizontal direction and the second horizontal direction are perpendicular to each other, and the interval between the two rotating rollers 11 in a pair forms a swing interval, which is used for moving the hoisting rope 3 of the crane.

[0033] like Figure 1As shown in Figure a, during normal crane operation, the load is heavy, and the tension on rope 3 is sufficient, allowing it to remain fully taut. Furthermore, because the load's weight far outweighs the frictional forces of the various mechanisms, the impact of these frictional forces on the spreader 2's tipping is essentially negligible, resulting in virtually no tilt during loaded operation. During normal operation, stabilizer 1 is inoperative, unaffecting normal lifting operations. There is a gap between rope 3 and stabilizer 1, resulting in no friction and no impact on the service life of rope 3.

[0034] Rope 3 is wound as follows Figure 6 As shown, the hoisting rope 3 is divided into a first rope segment 31, a second rope segment 32, a third rope segment 33 and a fourth rope segment 34 by three rollers. When the hoisting mechanism controls the sling 2 to descend, the first rope segment 31 and the pulley closest to the drum move first, and then the next pulley moves in sequence, that is, the first rope segment 31 and the second rope segment 32 move first, and then the third rope segment 33 and the fourth rope segment 34 move. In this way, there will be a time difference. When the first rope segment 31 and the second rope segment 32 move, but the third rope segment 33 and the fourth rope segment 34 have not yet moved, the entire sling 2 will overturn to the side of the first rope segment 31 and the second rope segment 32, as shown in FIG. Figure 7 shown.

[0035] like Figure 1 As shown in Figure b, when the crane lifts the spreader 2 without load, the rope 3 cannot be fully tightened due to the light weight of the spreader 2. As a result, the spreader 2 will have a tipping moment generated by its own weight when it is raised or lowered, causing the spreader 2 to have a tipping tendency. By adding the stabilizer 1, the stabilizer 1 works at this time. The pressure F1 and F2 of the rope 3 generate a stabilizing moment to balance the tipping moment, offsetting the tipping tendency of the spreader 2, and the spreader 2 returns to the position as shown in Figure 2. Figure 1 c, thereby stabilizing the sling 2.

[0036] Since the spreader 2 basically only has a tendency to overturn when it is unloaded, and a stabilizing moment will be immediately generated once the overturning tendency occurs, the overturning moment generated by the spreader 2 is very small and has no effect on the use of the lifting rope 3.

[0037] like Figure 2 and Figure 5 As shown, by using the rotating roller 11, the friction between the stabilizing device 1 and the sling 3 is converted into rolling friction, which greatly reduces the wear effect of the sling 3 on the sling 3 due to the friction of the edge of the sling 2 during use, and solves the problem that the sling 3 is easily scratched by the tilt of the sling 2.

[0038] When the sling 2 tilts, the rotating roller 11 generates a stabilizing torque to restore the sling 2 to a balanced state, without restricting the sliding of the sling rope 3. The sling rope 3 can continue to pull the sling 2 up and down smoothly. Compared with the prior art, the friction between the anti-tilt sleeve and the sling rope 3 is sliding friction, which causes severe wear. In this solution, the rotating roller 11 of the stabilizing device 1 is equipped with a bearing 14. The friction between the rotating roller 11 and the sling rope 3 during operation is rolling friction, which causes very little wear. With this structure, only the movement of the sling rope 3 in the horizontal direction perpendicular to the axis of the rotating roller 11 is constrained, and the other five degrees of freedom are unconstrained, minimizing the adverse effects on the sling rope 3 and solving the problem of wear on the sling rope 3 caused by the use of an anti-tilt sleeve.

[0039] Specifically, it also includes a plurality of rotating shafts 12, the number of the rotating shafts 12 is equal to the number of the rotating rollers 11, and the plurality of rotating shafts 12 are respectively installed on the fixed frame 13, the axis of the rotating shaft 12 is parallel to the second horizontal direction, and the outer periphery of each rotating shaft 12 is respectively installed with the rotatable rotating roller 11 through a bearing 14.

[0040] In one embodiment, a stabilizing device 1 is provided for each section of the lifting rope 3 to prevent the lifting device 2 from tipping over.

[0041] Preferably, the number of the rotating shafts 12 is half the number of the rotating rollers 11, and several of the rotating shafts 12 are respectively installed on the fixed frame 13, the axis of the rotating shaft 12 is parallel to the second horizontal direction, and two rotatable rotating rollers 11 are installed on the same rotating shaft 12 through bearings 14.

[0042] like Figure 2 and Figure 4 As shown, in a more preferred embodiment, a fixing frame 13 is installed above each roller of the sling 2, and the four rotating rollers 11 on a fixing frame 13 are divided into two groups. Each group of rotating rollers 11 corresponds to the incoming and outgoing ropes of the same sling rope 3 on both sides of the roller, respectively, solving the problem of inconvenient installation of the bracket in the middle range of the roller due to the large diameter of the roller.

[0043] Preferably, the fixed frame 13 includes a base plate 131, a first bracket 132 and a second bracket 133, the base plate 131 is fixed to the sling 2, the first bracket 132 and the second bracket 133 are installed on the base plate 131, the first bracket 132 and the second bracket 133 are arranged opposite to each other, and two rotating shafts 12 are arranged in parallel on the fixed frame 13, and the two ends of the rotating shaft 12 are respectively connected to the first bracket 132 and the second bracket 133.

[0044] Since the distance between the two beams parallel to the axis of the roller in the sling is usually relatively far, this structure is adopted to add a bottom plate 131 parallel to the axis of the roller on the top of the sling. By adding the bottom plate 131, the fixing frame 13 can be installed parallel to both sides of the roller.

[0045] like Figure 4 As shown, in one embodiment, the sling 2 is provided with two rollers, the first bracket 132 and the second bracket 133 are symmetrically arranged "L"-shaped brackets, a reinforcing plate is provided between the two vertical angles of the "L"-shaped bracket, and a first bracket 132 and a second bracket 133 are provided above each roller on both sides along the horizontal diameter direction.

[0046] Preferably, the two rotating rollers 11 located on the same rotating shaft 12 are defined as a first roller 111 and a second roller 112, the first roller is close to the first bracket 132, the second roller 112 is close to the second bracket 133, a shaft sleeve 15 is provided between the first roller 111 and the first bracket 132, a shaft sleeve 15 is provided between the second roller 112 and the second bracket 133, a shaft sleeve 15 is provided between the first roller 111 and the second roller 112, the gap between the first roller 111 and the first bracket 132 is smaller than the diameter of the external suspension rope 3, the gap between the second roller 112 and the second bracket 133 is smaller than the diameter of the external suspension rope 3, and the gap between the first roller 111 and the second roller 112 is smaller than the diameter of the external suspension rope 3.

[0047] like Figure 3 As shown, this structure ensures the stability and independent rolling of the two rotating rollers 11 on the same rotating shaft 12, and at the same time prevents the hanging rope 3 from falling into the gap between the two ends of the rotating roller 11 due to sudden accidents caused by external forces.

[0048] like Figure 3 As shown in FIG. 1 a , in one embodiment, the gap between the two ends of the rotating roller 11 is reduced by reducing the length of the sleeve 15 .

[0049] like Figure 3 As shown in FIG. 2 b, in another embodiment, countersunk holes are provided at both ends of the rotating roller 11, and the gap between the two ends of the rotating roller 11 is reduced by increasing the depth of the countersunk holes.

[0050] A sling comprises a mounting frame 21, a hook 22 and the above-mentioned stabilizing device, wherein the stabilizing device 1 is mounted on the top of the mounting frame 21, and the mounting frame 21 is rotatably connected to a plurality of movable pulleys, which are located directly below the stabilizing device 1.

[0051] In a specific embodiment, the first bracket 132 and the second bracket 133 are respectively disposed above both sides of the roller in the sling 2 along the horizontal diameter direction.

[0052] Preferably, the vertical gap between the rotating roller 11 and the top of the mounting frame 21 is 10 to 50 mm.

[0053] This structure can ensure that the spreader 2 will not overturn when running without load, while reducing the impact of the increase in the overall height of the spreader 2 due to the addition of the stabilizing device 1 on the actual lifting height.

[0054] A crane comprises a frame, a traveling device, a lifting drive, a drum, a lifting rope 3 and the above-mentioned lifting device, wherein one end of the lifting rope 3 is fixed to the frame, and the other end of the lifting rope 3 passes through the swinging gap formed by the two paired rotating rollers 11, bypasses the corresponding movable pulley, passes through the swinging gap formed by another pair of rotating rollers 11, and then is fixedly wrapped around the drum.

[0055] In one embodiment, a rotating roller 11 is provided on the same rotating shaft 12 , and two groups of rotating rollers 11 are installed on four rotating shafts 12 . The incoming and outgoing ropes of the suspension rope 3 successively pass through the swinging interval formed by the two groups of paired rotating rollers 11 .

[0056] In another embodiment, the two rotating rollers 11 on the same side of the two sets of paired rotating rollers 11 are set on the same rotating shaft 12, and the two sets of rotating rollers 11 are installed on two rotating shafts 12. The incoming rope and outgoing rope of the suspension rope 3 pass through the swinging gap formed by the two sets of paired rotating rollers 11 in turn.

[0057] Preferably, when the sling 2 is in a normal lifting state, the horizontal gap d1 between each sling rope 3 and any of the two rotating rollers 11 corresponding thereto is 8-12 mm;

[0058] The minimum set distance of the horizontal distance d2 between any end of the rotating roller 11 and the lifting rope 3 when the sling 2 is running under normal load is 50 mm.

[0059] like Figure 1 a and Figure 4 As shown, this structure can ensure that the spreader 2 will not overturn when running without load, while reducing the contact of the stabilizing device 1 with the lifting rope 3 when the spreader 2 is running under normal load, thereby reducing the impact of the stabilizing device 1 on the spreader 2 running under normal load.

[0060] This ensures that the sling rope 3 will not deviate from the length range of the rotating roller 11 when the sling 2 is running without load.

[0061] Preferably, the rotating roller 11 is made of a material with a lower hardness than the hanging rope 3 .

[0062] In one embodiment, the suspension rope 3 is made of steel wire rope, and the rotating roller 11 is made of nylon with a hardness lower than that of the steel wire rope to prevent the steel wire rope from wearing out before the rotating roller 11. As a simple alternative, the rotating roller 11 can be made of Q235, 20 steel, copper and copper alloy, polytetrafluoroethylene, etc.

[0063] In a more preferred embodiment, the rotating roller 11 is made of Q235 material which is slightly less hard than the steel wire rope, so as to avoid the rotating roller 11 being too soft and causing the rotating roller 11 to wear too quickly, which is not conducive to economy.

[0064] In one embodiment, the stabilizing device 1 is used for a crane using a steel wire rope as a traction rope 3 .

[0065] In another embodiment, the stabilizing device 1 is used for a crane using chains as traction ropes 3 .

[0066] Other structures and operations according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0067] Throughout this specification, references to terms such as "embodiment" and "example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0068] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stabilizing device for preventing a spreader from tipping over, characterized in that: It includes a fixed frame and a plurality of rotating rollers, which are respectively arranged in pairs and rotatably on the fixed frame. The two rotating rollers in a pair are spaced apart and parallel to each other along a first horizontal direction, the axes of the rotating rollers are parallel to a second horizontal direction, the first horizontal direction and the second horizontal direction are perpendicular to each other, and the interval between the two rotating rollers in a pair forms a swing interval, which is used for moving the hoisting rope of the crane.

2. The stabilizing device for preventing a spreader from tipping over according to claim 1, characterized in that: It also includes a plurality of rotating shafts, the number of which is equal to the number of the rotating rollers, and the plurality of rotating shafts are respectively installed on the fixed frame, the axis of the rotating shaft is parallel to the second horizontal direction, and the outer periphery of each rotating shaft is respectively installed with a rotatable rotating roller through a bearing.

3. The stabilizing device for preventing a spreader from overturning according to claim 1, characterized in that: It also includes a plurality of rotating shafts, the number of which is half the number of the rotating rollers, and the plurality of rotating shafts are respectively installed on the fixed frame, the axis of the rotating shaft is parallel to the second horizontal direction, and two rotatable rotating rollers are installed on the same rotating shaft through bearings.

4. The stabilizing device for preventing a spreader from overturning according to claim 3, characterized in that: The fixed frame includes a base plate, a first bracket and a second bracket. The base plate is fixed to the sling, the first bracket and the second bracket are installed on the base plate, the first bracket and the second bracket are arranged opposite to each other, and two rotating shafts are arranged in parallel on the fixed frame, and the two ends of the rotating shaft are respectively connected to the first bracket and the second bracket.

5. The stabilizing device for preventing a spreader from overturning according to claim 4, characterized in that: The two rotating rollers located on the same rotating shaft are defined as the first roller and the second roller, the first roller is close to the first bracket, the second roller is close to the second bracket, a shaft sleeve is provided between the first roller and the first bracket, a shaft sleeve is provided between the second roller and the second bracket, a shaft sleeve is provided between the first roller and the second roller, the gap between the first roller and the first bracket is smaller than the diameter of the external lifting rope, the gap between the second roller and the second bracket is smaller than the diameter of the external lifting rope, and the gap between the first roller and the second roller is smaller than the diameter of the external lifting rope.

6. A sling characterized by: It comprises a mounting frame, a hook and several stabilizing devices according to any one of claims 1 to 5, wherein the stabilizing device is installed on the top of the mounting frame, and the mounting frame is rotatably connected to several movable pulleys, and the movable pulleys are located directly below the stabilizing device.

7. A sling according to claim 6, characterized in that: The vertical gap between the rotating roller and the top of the mounting frame is 10 to 50 mm.

8. A crane, characterized in that: It includes a frame, a walking device, a lifting drive, a drum, a lifting rope and the sling according to claim 6 or 7, one end of the lifting rope is fixed to the frame, and the other end of the lifting rope passes through the swinging gap formed by the two pairs of rotating rollers, bypasses the corresponding movable pulley, passes through the swinging gap formed by another pair of rotating rollers, and then is fixedly wrapped around the drum.

9. The crane according to claim 8, characterized in that: When the sling is in a normal lifting state, the horizontal gap d1 between each lifting rope and any of the two rotating rollers in its corresponding pair is 8-12 mm; The minimum set distance of the horizontal distance d2 between any end of the rotating roller and the lifting rope when the sling is running under normal load is 50 mm.

10. The crane according to claim 8, characterized in that: The rotating roller is made of a material having a hardness lower than that of the hanging rope.

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