An inverted trapezoid heavy-duty lifting tool

Abstract

The present invention discloses an inverted trapezoidal heavy-duty sling, comprising: a cross beam, an adjusting screw, a lifting rope and a U-shaped shackle; inclined through holes are respectively arranged at the longitudinal two ends of the cross beam, and the lower ends of the two inclined through holes are inclined towards each other; the upper end of the adjusting screw is installed in the inclined through hole, and the lower end is connected to the upper end of the lifting rope, and the axial direction of the adjusting screws on the same side and the lifting rope are on the same straight line; the lower end of the lifting rope is connected to the upper end of the U-shaped shackle, and the lower end of the U-shaped shackle serves as a lifting point for external equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting tools, and particularly relates to an inverted trapezoid heavy-duty sling. Background Art

[0002] For large-tonnage cylindrical equipment with a weight exceeding 10 tons and a diameter greater than 3350 mm, during the process of transferring and operating within a cylindrical space, a sling is required to assist in the transfer and operation. Currently, the slings used for cylindrical equipment generally have an anti-clamping sling at each end. During the lifting process, it is impossible to perform lateral centering adjustment and longitudinal centering adjustment. At the same time, to prevent the large-scale rotation of the cylindrical equipment and prevent the sling from rubbing against the equipment during this operation, it is quite difficult for the current sling to meet this operation requirement. Summary of the Invention

[0003] In view of this, the present invention provides an inverted trapezoid heavy-duty sling for lifting large-tonnage cylindrical equipment within a cylindrical space, which can prevent the large-scale rotation of the cylindrical equipment and prevent rubbing between the sling and the equipment.

[0004] The technical solution of the present invention is: an inverted trapezoid heavy-duty sling, comprising: a cross beam, an adjustment screw, a lifting rope, and a U-shaped shackle; the longitudinal ends of the cross beam are respectively provided with inclined through holes, and the lower ends of the two inclined through holes incline towards each other; the upper end of the adjustment screw is installed in the inclined through hole, and the lower end is connected to the upper end of the lifting rope, and the axial direction of the adjustment screws on the same side is in the same straight line as the lifting rope; the lower end of the lifting rope is connected to the upper end of the U-shaped shackle, and the lower end of the U-shaped shackle serves as the lifting point of the external equipment.

[0005] Preferably, the cross beam includes: a main beam, a guiding seat, and an end lifting ear;

[0006] The main beam is a box-shaped beam, and two guiding seats are symmetrically fixed on both sides of the upper end of the main beam in the length direction, which cooperate with the external guiding structure to limit the upward movement of the sling along the axial direction of the cylindrical space;

[0007] End lifting ears are respectively arranged at both ends of the main beam in the length direction, and the two end lifting ears are symmetric about the width direction of the main beam; the end lifting ear is a double-ear structure, and a roller is equipped on the double-ear connecting shaft. On the one hand, when the sling carries the equipment and moves along the radial direction of the cylindrical space, the roller contacts the external support structure, thereby playing an axial supporting role for the sling and the equipment; on the other hand, the roller and the external support structure form a rolling friction pair; after the sling moves in place along the radial direction of the cylindrical space, the roller on the end lifting ear disengages from the external support structure, and the sling performs its own lateral adjustment and the up and down lifting operation of the equipment carried by the sling; wherein, the length direction of the main beam is defined as the transverse direction of the sling, and the width direction of the main beam is defined as the longitudinal direction of the sling.

[0008] Preferably, the cross beam further includes: reinforcing rings, each of which is installed at the upper end of an inclined through hole. The inner part thereof is in the shape of a spherical bowl and is matched with the spherical washer on the adjusting screw, enabling the sphere of the spherical washer to rotate in the spherical bowl of the reinforcing ring, ensuring that the spreader presents different inverted trapezoids according to different equipment.

[0009] Preferably, the adjusting screw further includes: a pull rod; the upper end of the pull rod is provided with an external thread, the lower end is a smooth shaft, and the lower end of the pull rod is a double ear seat for pin-joint connection with the upper end of the suspension rope; the pull rod is arranged in the inclined through hole of the main beam, and a pin shaft Ⅰ passes through the radial hole at the upper end, and a split pin is used in cooperation to prevent the pull rod from falling out of the inclined through hole when axially moving; wherein, the split pin is arranged in the radial hole of the pin shaft Ⅰ.

[0010] Preferably, the anti-loosening of the threaded part of the pull rod is achieved by forming an opposing form with two nuts sleeved thereon. Loosen the two nuts, and the up-and-down adjustment of the pull rod can adapt to different lifting positions, so that the adjusting screw and the equipment present different inclination angles; at the same time, the spherical washer is compacted by the nut.

[0011] Preferably, the main beam includes: an upper wing plate, a lower wing plate, a web plate and stiffening plates; the upper wing plate and the lower wing plate are connected as a whole by the web plates arranged front and back, and two stiffening plates are symmetrically arranged longitudinally along the main beam between the two web plates, and each stiffening plate is arranged transversely along the main beam.

[0012] Preferably, the main beam further includes: a butterfly ear, which is arranged between the two web plates, and three ear seats thereon respectively pass through the two web plates and the upper wing plate. The ear seats passing through the two web plates are pin-joint connected with the lifting power source steel wire rope of the external lifting system to realize the transmission of the lifting power of the spreader; the ear seat passing through the upper wing plate is connected with a transverse adjustment mechanism to realize the transmission of the transverse adjustment power; wherein, the transverse adjustment mechanism is connected with the double ear of the cross beam through a single ear and can drive the cross beam to adjust transversely, so as to realize the transverse movement of the spreader driving the equipment.

[0013] Preferably, the axial direction of each inclined through hole forms an inclination angle of 0.1° - 1° with the vertical direction where the spreader hoists the equipment.

[0014] Preferably, the U-shaped shackle has double ears both above and below, and the two double ears are arranged in a cross shape.

[0015] Preferably, both the adjusting screw and the U-shaped shackle are made of alloy steel, and it is necessary to ensure that the heat treatment performance reaches 30 - 34 HRC and the chromium plating hardness layer is controlled within 0.03 - 0.05 mm.

[0016] Beneficial effects:

[0017] 1. The spreader of the present invention adopts a single-beam horizontal structure form, which can prevent the large-scale rotation of the cylindrical equipment. When in the hoisting state, the spreader is in an inverted trapezoid shape, and the hoisting rope forms a certain angle with the equipment, which can effectively avoid the rubbing between the hoisting rope and the equipment.

[0018] 2. The beam designed in the present invention can not only limit the upward movement of the spreader along the axial direction of the cylindrical space through the guide seat, but also realize the axial support of the spreader and the equipment through the contact between the rollers on the end lifting lugs and the external support structure.

[0019] 2. The design of the main beam in the present invention enables the spreader to be connected to the movable pulley block of the hoisting system through the butterfly ear, and cooperate with the connection to the hoisting fulcrum of the equipment through the shackle, so as to realize the longitudinal centering adjustment of the equipment; at the same time, the spreader is equipped with a transverse adjustment mechanism through the butterfly ear, which can realize the transverse centering adjustment of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the spreader of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the beam in the present invention.

[0022] Figure 3 It is a schematic structural diagram of the main beam in the present invention.

[0023] <# Figure 4 It is a schematic structural diagram of the connection part of the adjusting screw in the present invention.

[0024] Among them, 1 - beam, 11 - main beam, 111 - upper wing plate, 112 - lower wing plate, 113 - web plate, 114 - stiffening plate, 115 - butterfly ear, 12 - guide seat, 13 - end lifting lug, 14 - reinforcing ring, 15 - bushing, 2 - adjusting screw, 21 - pin Ⅰ, 22 - split pin, 23 - nut, 24 - spherical washer, 25 - pin Ⅱ, 26 - pin Ⅲ, 3 - hoisting rope, 4 - U-shaped shackle, 5 - shackle pin, 6 - transverse adjustment mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following combines the drawings and gives embodiments to describe the present invention in detail.

[0026] This embodiment provides an inverted trapezoid heavy-duty spreader for hoisting large-tonnage cylindrical equipment in a cylindrical space, which can realize the transverse centering adjustment and longitudinal centering adjustment of the spreader. At the same time, the spreader can prevent the large-scale rotation of the cylindrical equipment and the rubbing between the spreader and the equipment.

[0027] As Figure 1 shown, the spreader includes: a beam 1, an adjusting screw 2, a hoisting rope 3 and a U-shaped shackle 4; among them, as Figure 2As shown in the figure, the crossbeam 1 includes: a main beam 11, a guide seat 12, an end lug 13, and a reinforcing ring 14;

[0028] Two guide seats 12 are symmetrically fixed (fixed by welding) on both sides of the upper end of the main beam 11 in the length direction. They cooperate with the external guide structure to limit the upward movement of the lifting tool along the axial direction of the cylindrical space. That is, when the lifting tool lifts the cylindrical equipment to the limit position, the lifting tool can only drive the cylindrical equipment to move radially along the cylindrical space and cannot continue to move upward along the axial direction of the cylindrical space, thereby realizing the radial guidance and axial limit of the cylindrical equipment and the lifting tool during the operation in the cylindrical space;

[0029] End lugs 13 are arranged at both ends of the main beam 11 in the length direction, and the two end lugs 13 are symmetric about the width direction of the main beam 11; the end lug 13 is a double-ear structure, and rollers are equipped on the double-ear connecting shaft. On the one hand, when the lifting tool carries the cylindrical equipment and moves radially along the cylindrical space, the rollers contact the external support structure, thereby playing an axial supporting role for the lifting tool and the cylindrical equipment; on the other hand, the rollers form rolling friction with the external support structure, which can reduce the frictional resistance; after the lifting tool moves radially along the cylindrical space to the position, the rollers on the end lug 13 disengage from the external support structure, and the lateral adjustment of the lifting tool itself and the up-and-down lifting operation of the lifting tool carrying the cylindrical equipment are carried out; among them, the length direction (longitudinal direction) of the main beam 11 is the lateral direction of the lifting tool, and the width direction (transverse direction) of the main beam 11 is the longitudinal direction of the lifting tool;

[0030] As Figure 3 shown, the main beam 11 is a box girder, which includes: an upper wing plate 111, a lower wing plate 112, a web 113, and a rib plate 114; the upper wing plate 111 and the lower wing plate 112 are connected into one body by the webs 113 arranged front and back. Two rib plates 114 are symmetrically arranged between the two webs 113 in the longitudinal direction of the main beam 11, and each rib plate 114 is arranged in the transverse direction of the main beam 11; among them, the upper wing plate 111 and the lower wing plate 112 have the structural bending resistance, the web 113 mainly bears the shear stress of the structure and the principal tensile stress caused by the torsional shear stress, and the rib plate 114 is used to enhance the longitudinal stiffness of the main beam 11;

[0031] Longitudinal ends of the upper wing plate 111 and the lower wing plate 112 are respectively provided with through inclined through holes (corresponding to two inclined through holes on the main beam 11). The axial direction of each inclined through hole forms an inclination angle of 0.1° - 1° with the vertical direction where the lifting equipment of the spreader is located, and the lower ends of the inclined through holes at both ends of the main beam 11 are inclined towards each other; reinforcing rings 14 are provided at the upper ends of the inclined through holes at both ends of the main beam 11. The interior of the reinforcing ring 14 is in the shape of a spherical bowl. The upper end of the adjusting screw 2 is arranged in the inclined through hole, and the reinforcing ring 14 cooperates with the spherical washer 24 on the adjusting screw 2, so that the spherical surface of the spherical washer 24 can rotate in the spherical bowl of the reinforcing ring 14, ensuring that the spreader presents different inverted trapezoids according to different equipment; among them, the cooperation between the reinforcing ring 14 and the spherical washer 24, on the one hand, facilitates flexible adjustment of the inverted trapezoid shape of the spreader, and on the other hand, can reduce local extrusion and reduce stress concentration;

[0032] The upper end of the lifting rope 3 is pin-connected with the double-ear seat at the lower end of the adjusting screw 2 through pin shaft Ⅱ 25, and the lower end is pin-connected with the double-ear at the upper end of the U-shaped shackle 4 through shackle pin 5. The double-ears at the lower end of the U-shaped shackle 4 are pin-connected with the inherent trunnion (heavy load lifting point) on the equipment through pin shaft Ⅲ 26, so as to realize that the lifting rope 3 and the equipment form a certain inclination angle, and the adjusting screw 2 and the lifting rope 3 on the same side are on the same inclined straight line.

[0033] In this embodiment, as Figure 4 shown, the adjusting screw 2 further includes: a pull rod, pin shaft Ⅰ 21, split pin 22 and nut 23; the upper end of the pull rod is provided with external threads and the lower end is a smooth shaft, and the double-ear seat is located at the lower end of the pull rod. The pull rod is arranged in the inclined through hole of the main beam 11, and pin shaft Ⅰ 21 passes through the radial hole at the upper end, and the split pin 22 is used in cooperation to prevent the pull rod from falling out of the inclined through hole when moving axially; among them, the split pin 22 is arranged in the radial hole of pin shaft Ⅰ 21;

[0034] The anti-loosening of the threaded part of the pull rod is realized by forming an opposed form by sleeving two nuts 23 on it. Loosen the two nuts 23 on the threaded part, and the pull rod can be adjusted up and down to adapt to different lifting positions. When the lifting positions are different, the adjusting screw 2 and the equipment present different inclination angles; the spherical washer 24 is compacted by the nut 23 to cooperate with the spherical surface of the reinforcing ring 14.

[0035] In this embodiment, the main beam 11 further includes: a butterfly ear 115, which is arranged between the two webs 113, and three ear seats on it respectively pass through the two webs 113 and the upper wing plate 111. The ear seats passing through the two webs 113 are pin-connected with the lifting power source steel wire rope of the external lifting system to realize the transmission of the lifting power of the spreader; the ear seat passing through the upper wing plate 111 is connected with a lateral adjustment mechanism 6 to realize the transmission of the lateral adjustment power.

[0036] In this embodiment, the lateral adjustment mechanism 6 can move along the lateral direction of the spreader (i.e., the longitudinal direction of the main beam 11). It is connected to the double ears of the cross beam 1 through a single ear. The lateral adjustment mechanism 6 drives the cross beam 1 to be adjusted in the lateral direction, so as to realize the lateral movement of the spreader driving the equipment.

[0037] In this embodiment, a bushing 15 is provided in each inclined through hole. The adjustment screw 2 is placed in the corresponding inclined through hole through the bushing 15, so that the adjustment screw 2 is arranged obliquely, which is beneficial to ensuring the stable installation between the adjustment screw 2 and the inclined through hole.

[0038] In this embodiment, the adjustment screw 2 is made of high-strength alloy steel with excellent mechanical properties (such as 30CrMnSi or 30CrMnSiA), and the heat treatment performance (30 - 34HRC) and the chromium-plated hard layer (controlled at 0.03 - 0.05 mm) should be ensured.

[0039] In this embodiment, the upper and lower double ears of the U-shaped shackle 4 are arranged in a cross shape. The axial direction of the ear holes of the upper double ears is parallel to the length direction of the main beam 11, and the axial direction of the ear holes of the lower double ears is parallel to the width direction of the main beam 11. The upper double ears are connected to the suspension rope 3 through the shackle pin 5 and remain in this state before and after the lifting operation. The lower double ears are connected to the inherent trunnion on the equipment through the pin Ⅲ 26. The lower double ears of the U-shaped shackle 4 are the connection positions between the spreader and the equipment. The arrangement of the lower double ears can, on the one hand, ensure that the U-shaped shackle 4 does not rub against the equipment when installed and removed, and on the other hand, facilitate disassembly.

[0040] In this embodiment, the U-shaped shackle 4 is made of high-strength alloy steel with excellent mechanical properties (such as 30CrMnSi or 30CrMnSiA), and the heat treatment performance (reaching 30 - 34HRC) and the chromium-plated hard layer (controlled at 0.03 - 0.05 mm) should be ensured.

[0041] In summary, the above is only a preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An inverted trapezoid heavy-duty sling, characterized in that, Including: Cross beam (1), adjusting screw (2), lifting rope (3) and U-shaped shackle (4); Oblique through holes are respectively arranged at the longitudinal two ends of the cross beam (1), and the lower ends of the two oblique through holes are inclined towards each other; The upper end of the adjusting screw (2) is installed in the oblique through hole, and the lower end is connected to the upper end of the lifting rope (3), and the axial direction of the adjusting screw (2) on the same side is on the same straight line as the lifting rope (3); The lower end of the lifting rope (3) is connected to the upper end of the U-shaped shackle (4), and the lower end of the U-shaped shackle (4) is used as the lifting point of the external equipment; The cross beam (1) includes: main beam (11), guiding seat (12) and end lifting lug (13); The main beam (11) is a box beam, and two guiding seats (12) are symmetrically fixed on both sides of the upper end of the main beam (11) in the length direction, and cooperate with the external guiding structure to limit the upward movement of the lifting tool along the axial direction of the cylindrical space; End lifting lugs (13) are respectively arranged at the two ends of the main beam (11) in the length direction, and the two end lifting lugs (13) are symmetrical about the width direction of the main beam (11); The end lifting lug (13) is a double-ear structure, and rollers are equipped on the double-ear connecting shaft. On the one hand, when the lifting tool carries the external equipment and moves radially along the cylindrical space, the rollers contact the external support structure, so as to play an axial support role for the lifting tool and the external equipment; On the other hand, the rollers and the external support structure form a rolling friction pair; After the lifting tool moves radially along the cylindrical space in place, the rollers on the end lifting lug (13) disengage from the external support structure, and the lateral adjustment of the lifting tool itself and the up-and-down lifting operation of the lifting tool carrying the external equipment are carried out; Among them, the length direction of the main beam (11) is the lateral direction of the lifting tool, and the width direction of the main beam (11) is the longitudinal direction of the lifting tool; The cross beam (1) further includes: reinforcing rings (14), and a reinforcing ring (14) is installed at the upper end of each oblique through hole, and its internal part is in the shape of a spherical bowl and cooperates with the spherical washer (24) on the adjusting screw (2), so that the spherical surface of the spherical washer (24) rotates in the spherical bowl of the reinforcing ring (14), ensuring that the lifting tool presents different inverted trapezoids according to different external equipment; The adjusting screw (2) further includes: a pull rod; The upper end of the pull rod is provided with an external thread, the lower end is a smooth shaft, and the lower end of the pull rod is a double-ear seat for pin-joint connection with the upper end of the lifting rope (3); The pull rod is arranged in the oblique through hole of the main beam (11), and a pin shaft I (21) passes through the radial hole at the upper end of the pull rod, and a split pin (22) is used in cooperation to prevent the pull rod from falling out of the oblique through hole when moving axially; Among them, the split pin (22) is arranged in the radial hole of the pin shaft I (21); The anti-loosening of the external thread of the pull rod is realized by forming an opposing form by sleeving two nuts (23) thereon. Loosen the two nuts (23), and the up-and-down adjustment of the pull rod can adapt to different lifting positions, so that the adjusting screw (2) and the external equipment present different inclination angles; At the same time, the spherical washer (24) is compacted by the nut (23).

2. The inverted trapezoid heavy-duty lifting tool according to claim 1, wherein The main beam (11) includes: an upper wing plate (111), a lower wing plate (112), a web plate (113) and stiffening plates (114); the upper wing plate (111) and the lower wing plate (112) are integrally connected by the front and rear web plates (113), and two stiffening plates (114) are symmetrically arranged longitudinally along the main beam (11) between the two web plates (113), and each stiffening plate (114) is arranged transversely along the main beam (11).

3. The inverted trapezoid heavy-duty sling according to claim 2, wherein The main beam (11) further includes: a butterfly ear (115), which is arranged between the two web plates (113), and three ear seats thereon respectively pass through the two web plates (113) and the upper wing plate (111), and the ear seats passing through the two web plates (113) are pin-connected with the hoisting power source steel wire rope of the external hoisting system to realize the transmission of the hoisting power of the spreader; the ear seat passing through the upper wing plate (111) is connected with a lateral adjustment mechanism (6) to realize the transmission of the lateral adjustment power; wherein, the lateral adjustment mechanism (6) is connected with the double ears of the cross beam (1) through a single ear, and can drive the cross beam (1) to be adjusted in the lateral direction, so as to realize the lateral movement of the spreader driving the external equipment.

4. The inverted trapezoid heavy-duty sling according to any one of claims 1-3, characterized in that, The axial direction of each inclined through hole forms an inclination angle of 0.1°-1° with the vertical direction where the spreader hoists the external equipment.

5. The inverted trapezoid heavy-duty sling according to any one of claims 1-3, characterized in that, The U-shaped shackle (4) has double ears both above and below, and the two double ears are arranged in a cross shape.

6. The inverted trapezoid heavy-duty sling according to any one of claims 1-3, characterized in that Both the adjusting screw (2) and the U-shaped shackle (4) are made of alloy steel, and the heat treatment performance should be guaranteed to reach 30-34HRC, and the chromium plating hardening layer is controlled within 0.03-0.05mm.

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