Portal crane sling capable of reducing swing amplitude

Abstract

A gantry crane lifting appliance capable of reducing the swing amplitude comprises an upper supporting beam, a movable pulley block is arranged in the middle of the top end of the upper supporting beam, an anti-swing mechanism is arranged on the upper supporting beam and comprises a first sleeve, the lower end of the first sleeve is slidably sleeved with a second sleeve, and the lower end of the second sleeve is slidably sleeved with a third sleeve. The bottom end of the third sleeve is hinged to the top end of the end of the upper supporting beam through a hinge base, a first compression spring is arranged at the upper end of the interior of the first sleeve, and a second compression spring is arranged at the upper end of the interior of the second sleeve. A lower supporting beam is horizontally arranged below the upper supporting beam, lifting hooks are arranged at the two ends of the lower supporting beam, a swing mechanism is arranged between the lower supporting beam and the upper supporting beam, and the lower supporting beam is assembled on the upper supporting beam through the swing mechanism. The device is simple in structure and convenient to use.

Description

Technical Field

[0001] This utility model belongs to the field of crane technology, and in particular relates to a lifting device for bridge gantry cranes that reduces sway amplitude. Background Technology

[0002] A crane is a multi-action lifting machine that vertically lifts and horizontally moves heavy objects within a certain range. Also known as overhead cranes, gantry cranes, or simply cranes, cranes are generally classified into four categories: light and small lifting equipment, bridge cranes, gantry cranes, and tower cranes. Among them, bridge cranes and gantry cranes are the most widely used and numerous large and medium-sized lifting machinery. The lifting device of a bridge crane is connected to the hoisting drum of the hoisting mechanism via a wire rope. However, because bridge cranes lift and lower the lifting device by pulling it up and down with a wire rope, the lifting device at the bottom of the wire rope is prone to swaying when lifting heavy objects during the movement of the bridge crane. This not only increases the difficulty of operation for the crane operator, but also makes it easy for the heavy object to detach during the swaying process, causing certain damage to workers and goods on the ground. For example, the utility model patent entitled "A Utility Model Patent for a Crane Anti-Sway Lifting Device" (authorization announcement number: CN213231249U) discloses that "a three-dimensional structure is formed between four pulley blocks, multiple strands of wire rope, and the crane hoisting drum." Although this can solve the swaying of the lifting device to a certain extent, its swaying amplitude is still large when the lifting height is too high or the lifting weight is large. Moreover, the existing technology has a relatively complex structure, which increases the difficulty of operation for the operator. Utility Model Content

[0003] To address the technical problem of easy swaying in existing bridge and gantry crane lifting devices, this utility model provides a bridge and gantry crane lifting device with reduced sway amplitude. It includes a horizontally arranged upper support beam that provides support. A movable pulley block is located at the top center of the upper support beam, connected to the lifting mechanism of the trolley via a wire rope. A trolley traveling mechanism is located at the bottom of the trolley, comprising trolley traveling wheels and a trolley traveling motor, enabling the trolley to move freely. The lifting mechanism includes a lifting drum, a lifting motor, a reducer, and a brake, all mounted on the trolley. The lifting motor drives the lifting drum to rotate and wind or release the wire rope. Two symmetrically arranged anti-sway mechanisms are provided on the upper support beam. The anti-sway mechanism includes a first sleeve that is inclined. The top end of the first sleeve is hinged to the bottom end of the lifting trolley via a hinge seat. A second sleeve is slidably fitted onto the lower end of the first sleeve. A third sleeve is slidably fitted onto the lower end of the second sleeve. The bottom end of the third sleeve is hinged to the top end of the upper support beam via a hinge seat. A first compression spring is provided at the upper end of the first sleeve, and a second compression spring is provided at the upper end of the second sleeve. The two anti-sway mechanisms are arranged in an inverted "V" shape. The first compression spring presses against the second sleeve, and the second compression spring presses against the third sleeve. When the upper support beam rises under the traction of the wire rope, the third sleeve slides towards the inside of the second sleeve, and the upper end of the second sleeve slides towards the inside of the first sleeve. The first and second compression springs are compressed. Under the action of the first and second compression springs, the bottom end of the third sleeve presses against the upper support beam, which can reduce the up-and-down sway of the lifting device. A horizontally positioned lower support beam is located below the upper support beam, serving a supporting function. Hooks are located at both ends of the lower support beam, and a slewing mechanism connects the lower and upper support beams. The lower support beam is mounted on the upper support beam via this slewing mechanism. The slewing mechanism includes a U-shaped support frame located at the bottom of the upper support beam. A rotating shaft is rotatably mounted on the support frame via bearings. The lower end of the rotating shaft is fixedly connected to the lower support beam. A vertically positioned rotary motor is fixed to the top of the support frame. The upper end of the rotating shaft is connected to the power output shaft of the rotary motor. The rotary motor is connected to a power supply and a PLC controller via cables. Starting the rotary motor causes the lower support beam to rotate, thereby adjusting the angle of the hooks.

[0004] Preferably, the top end of the second sleeve is provided with a first slider that is adapted to the inner wall of the first sleeve, and the lower end of the first sleeve is provided with a first annular block for blocking the first slider.

[0005] Preferably, the top end of the third sleeve is provided with a second slider that is adapted to the inner wall of the second sleeve, and the lower end of the second sleeve is provided with a second annular block for blocking the second slider.

[0006] The above scheme has the following advantages:

[0007] The anti-sway mechanism, through the support of the first, second, and third sleeves, restricts the horizontal sway of the lower support beam, improving the stability of the hook when lifting heavy objects and enhancing safety. The first and second compression springs are compressed, and under their action, the bottom end of the third sleeve presses against the upper support beam, reducing the vertical sway of the lifting device. The slewing mechanism allows for easy adjustment of the lifting angle of the hook at the lower end of the lower support beam via a slewing motor, facilitating crane operation. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model;

[0009] Figure 2 for Figure 1 Enlarged view of part A.

[0010] Reference numerals in the attached drawings: 1. Crane trolley; 2. Upper support beam; 3. Anti-sway mechanism; 4. Lower support beam; 5. Support frame; 6. Slewing mechanism; 7. Hook; 11. Lifting mechanism; 12. Lifting drum; 13. Wire rope; 21. Moving pulley block; 31. First sleeve; 32. Second sleeve; 33. Third sleeve; 34. First compression spring; 35. Second compression spring; 36. First slider; 37. Second slider. Detailed Implementation

[0011] like Figure 1-2As shown, a bridge crane lifting device for reducing sway amplitude includes a horizontally arranged upper support beam 2, which serves as a support. A movable pulley block 21 is provided at the middle of the top of the upper support beam 2. The movable pulley block 21 is connected to the lifting mechanism 11 of the crane trolley 1 through a wire rope 13. The bottom end of the crane trolley 1 is provided with a trolley traveling mechanism, which includes trolley traveling wheels and a trolley traveling motor, and can drive the crane trolley 1 to move freely. The lifting mechanism 11 includes a lifting drum 12, a lifting motor, a reducer and a brake, which are mounted on the crane trolley 1. The lifting motor drives the lifting drum 12 to rotate and wind or release the wire rope 13. The upper support beam 2 is equipped with two symmetrically arranged anti-sway mechanisms 3. Each anti-sway mechanism 3 includes a first sleeve 31 arranged at an inclination. The top end of the first sleeve 31 is hinged to the bottom end of the crane trolley 1 via a hinge seat. A second sleeve 32 is slidably fitted onto the lower end of the first sleeve 31. A third sleeve 33 is slidably fitted onto the lower end of the second sleeve 32. The bottom end of the third sleeve 33 is hinged to the top end of the upper support beam 2 via a hinge seat. A first compression spring 34 is provided inside the upper end of the first sleeve 31, and a second compression spring 35 is provided inside the upper end of the second sleeve 32. The two anti-sway mechanisms 3 are arranged in an inverted figure-eight shape. The first compression spring 34 presses against the second sleeve 32, and the second compression spring 35 presses against the third sleeve 33. When the upper support beam 2 rises under the traction of the wire rope 13, the third sleeve 33 slides towards the inside of the second sleeve 32, and the upper end of the second sleeve 32 slides towards the inside of the first sleeve 31. The first compression spring 34 and the second compression spring 35 are compressed. Under the action of the first compression spring 34 and the second compression spring 35, the bottom end of the third sleeve 33 presses against the upper support beam 2, which can reduce the up-and-down swaying of the lifting device. A horizontally positioned lower support beam 4 is provided below the upper support beam 2, serving a supporting function. Both ends of the lower support beam 4 are equipped with hooks 7, and a slewing mechanism 6 is provided between the lower support beam 4 and the upper support beam 2. The lower support beam 4 is mounted on the upper support beam 2 via the slewing mechanism 6. The slewing mechanism 6 includes a support frame 5 located at the bottom of the upper support beam 2. The support frame 5 is U-shaped, and a rotating shaft is rotatably mounted on the support frame 5 via bearings. The lower end of the rotating shaft is fixedly connected to the lower support beam 4, and a vertically positioned rotary motor is fixed at the top of the support frame 5. The upper end of the rotating shaft is connected to the power output shaft of the rotary motor. The rotary motor is connected to a power supply and a PLC controller via a cable. When the rotary motor is started, it can drive the lower support beam 4 to rotate, thereby adjusting the angle of the hooks 7.

[0012] Preferably, the top end of the second sleeve 32 is provided with a first slider 36 that is adapted to the inner wall of the first sleeve 31, and the lower end of the first sleeve 31 is provided with a first annular block for blocking the first slider 36.

[0013] Preferably, the top end of the third sleeve 33 is provided with a second slider 37 that is adapted to the inner wall of the second sleeve 32, and the lower end of the second sleeve 32 is provided with a second annular block for blocking the second slider 37.

[0014] Usage process:

[0015] In use, the lifting trolley 1 is mounted on the trolley travel track on the main beam of the gantry crane. The lifting trolley 1 moves the device above the object to be lifted. The lifting motor is then started, causing the lifting drum 12 to release the wire rope 13. The wire rope 13 pulls the upper support beam 2 downwards. At this time, the second sleeve 32 moves downwards along the inner wall of the first sleeve 31, and the third sleeve 33 slides downwards along the inner wall of the second sleeve 32. The first compression spring 34 presses against the second sleeve 32, and the second compression spring 35 presses against the third sleeve 33. Therefore, the third sleeve... Pipe 33 is pressed against the upper support beam 2. The first sleeve 31, the second sleeve 32 and the third sleeve 33 restrict the upper support beam 2 from swinging in the horizontal direction. The rotary motor is started, and the rotary motor drives the lower support beam 4 to rotate. After the hook 7 moves to the appropriate position, the heavy object is hoisted. Then the hoisting motor is started in the reverse direction. The hoisting drum 12 pulls the heavy object on the hook 7 upward through the wire rope 13. During the upward movement, the third sleeve 33 moves towards the second sleeve 32, and the second sleeve 32 moves towards the first sleeve 31. The first compression spring 34 and the second compression spring 35 are compressed.

[0016] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "horizontal", "vertical", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A bridge-gantry crane's spreader for reducing the swing amplitude, comprising a horizontally arranged upper support beam, a movable pulley block is arranged at the middle of the top end of the upper support beam, and the movable pulley block is connected to the hoisting mechanism of the trolley through a steel wire rope, characterized in that: The upper support beam is equipped with two symmetrically arranged anti-sway mechanisms. Each anti-sway mechanism includes a first sleeve that is inclined, with its top end hinged to the bottom end of the crane trolley via a hinge seat. A second sleeve is slidably fitted onto the lower end of the first sleeve, and a third sleeve is slidably fitted onto the lower end of the second sleeve. The bottom end of the third sleeve is hinged to the top end of the upper support beam via a hinge seat. A first compression spring is provided inside the upper end of the first sleeve, and a second compression spring is provided inside the upper end of the second sleeve. Below the upper support beam, there is a horizontally arranged lower support beam. Both ends of the lower support beam are equipped with hooks, and a slewing mechanism is provided between the lower support beam and the upper support beam. The lower support beam is assembled onto the upper support beam via the slewing mechanism.

2. A sway-reducing bridge gantry crane spreader according to claim 1, characterized in that: The top of the second sleeve is provided with a first slider that is adapted to the inner wall of the first sleeve, and the lower end of the first sleeve is provided with a first annular block for blocking the first slider.

3. A sway-reducing bridge gantry crane spreader according to claim 1, characterized in that: The top of the third sleeve is provided with a second slider that is adapted to the inner wall of the second sleeve, and the lower end of the second sleeve is provided with a second annular block for blocking the second slider.

4. A sway-reducing bridge gantry crane spreader according to claim 1, characterized in that: The slewing mechanism includes a support frame located at the bottom of the upper support beam. The support frame is U-shaped and a rotating shaft is rotatably mounted on the support frame via bearings. The lower end of the rotating shaft is fixedly connected to the lower support beam. A vertically mounted slewing motor is fixed at the top of the support frame, and the upper end of the rotating shaft is connected to the power output shaft of the slewing motor.

5. A sway-reducing bridge gantry crane spreader according to claim 1, characterized in that: The two anti-sway mechanisms are arranged in an inverted figure-eight shape.

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