A double-beam double-suspension-point bridge crane
By setting up a first displacement mechanism and a second displacement mechanism on a bridge crane, and using a lead screw and motor drive to synchronously adjust the distance between the moving pulley assembly and the hook, the problems of inconvenient operation and high cost of existing bridge cranes are solved, and flexible hook adjustment and efficient lifting of heavy objects are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN SHENZHOU HEAVY MASCH CO LTD
- Filing Date
- 2025-09-19
- Publication Date
- 2026-07-21
AI Technical Summary
Existing bridge cranes are inconvenient to operate and have high production costs when equipped with double hooks. It is difficult to effectively adjust the distance and height of the two hooks to be synchronized, which increases the difficulty of operation for the driver and the production cost.
The distance between the movable pulley assembly and the hook is adjusted by a first displacement mechanism and a second displacement mechanism respectively. The synchronous movement of the movable pulley assembly and the hook is achieved through the threaded connection of the first lead screw and the second lead screw, and the adjustment is automated by combining with a PLC controller.
It simplifies the process of adjusting the hook distance, reduces operational difficulty, decreases production costs, and improves assembly efficiency, making it suitable for lifting needs of different sizes and weights.
Smart Images
Figure CN224530401U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of crane technology, and in particular relates to a double-beam double-lifting-point bridge crane. Background Technology
[0002] Bridge cranes are lifting equipment that spans across workshops, warehouses, and material yards for material handling. Because their ends rest on tall concrete pillars or metal supports, resembling a bridge, the bridge frame of the bridge crane runs longitudinally along tracks laid on elevated sections on both sides. This allows for full utilization of the space beneath the bridge frame for material handling, without being obstructed by ground equipment. It is the most widely used and numerous type of lifting machinery. However, existing bridge cranes often have some problems in practical use. For example, depending on the usage requirements, bridge cranes need to be equipped with two hooks, and the distance between the two hooks needs to be adjusted. Current technology generally addresses this issue by... Two lifting trolleys are installed on the bridge frame, each with an independent lifting mechanism. A hook is installed under the lifting mechanism and connected to the lifting mechanism on the trolley via a wire rope. Although this arrangement can achieve the purpose of lifting heavy objects with two hooks, it greatly increases the difficulty of operation for the driver. Adjusting the distance between the two lifting trolleys and synchronizing the lifting height of the two hooks are difficult. It also increases the production cost of the crane, as well as the overall weight and steel consumption in the production of the crane. Therefore, the existing double-girder bridge crane has the technical problems of inconvenient operation and high production cost. Utility Model Content
[0003] To address the technical problems of inconvenient operation and high production costs associated with existing bridge cranes due to their double hook configuration, this utility model provides a double-beam, double-lifting-point bridge crane. The crane includes a crane bridge frame comprising two horizontally spaced main beams. End beams are fixed to both ends of the main beams, forming a U-shaped crane bridge frame. A trolley traveling mechanism is mounted on the end beams. This mechanism includes rotatable trolley traveling wheels mounted on the end beams and a trolley traveling motor fixed to the end beams. The trolley traveling wheels and the trolley traveling motor are connected via a transmission connection. The trolley traveling motor is connected to a power supply and a PLC controller via cables. A trolley traveling track parallel to the main beams is located at the top of the main beams. The top of the crane bridge is equipped with a lifting trolley, which has a lifting mechanism. The lifting trolley includes a trolley frame, and the bottom of the trolley frame is equipped with a trolley traveling mechanism. The trolley traveling mechanism includes trolley traveling wheels and a trolley traveling motor. The trolley traveling wheels are rotatably mounted on the trolley frame, and the trolley traveling motor is fixed on the trolley frame. The power output shaft of the trolley traveling motor is connected to the trolley traveling wheels via a transmission. The trolley traveling motor is connected to the power supply and PLC controller via a cable. The trolley traveling mechanism is movable on the trolley traveling track at the top of the main beam. The lifting mechanism includes a lifting drum set at the top of the trolley frame, with both ends of the lifting drum rotatably mounted on the trolley frame. It also includes a lifting motor fixed on the trolley frame, which is connected to the lifting drum via a transmission. A lifting device is installed below the crane bridge, including a horizontally arranged support beam. Two symmetrically arranged movable pulley assemblies are located at the upper end of the support beam. Each movable pulley assembly includes a movable pulley bracket and a movable pulley rotatably mounted on the bracket. A first displacement mechanism is provided between the two movable pulley assemblies and the support beam. The two movable pulley brackets are mounted on the upper end of the support beam via the first displacement mechanism, which can synchronously adjust the two movable pulley assemblies to move towards each other or away from each other. Both movable pulley assemblies are connected to a lifting mechanism via wire ropes. The first displacement mechanism includes a first groove with a convex cross-section at the top of the support beam. Two first sliders matching the first groove are slidably connected within the first groove. The movable pulley brackets are fixed to the first sliders, and the first groove contains... A first lead screw is arranged parallel to the support beam. The two ends of the first lead screw are rotatably mounted on the two ends of the support beam. A first displacement motor is provided at the end of the support beam. The first displacement motor is connected to the power supply and PLC controller through a cable. When the first displacement motor is started, it drives the first lead screw to rotate. By changing the rotation direction of the first lead screw, the distance between the two first sliders is adjusted. When the first lead screw rotates clockwise, the two first sliders move in opposite directions, and the distance between the two first sliders increases. When the first lead screw rotates counterclockwise, the two first sliders move towards each other, and the distance between the two first sliders decreases. The first displacement motor is connected to the first lead screw through a transmission, and the two first sliders are threadedly connected to the first lead screw. The internal threads of the two first sliders are opposite. A movable pulley assembly is mounted on the top of the first slider.Two symmetrically arranged hooks are located below the support beam. A second displacement mechanism is provided between the hooks and the support beam. The two hooks are movably mounted on the support beam via the second displacement mechanism, which can synchronously drive the two hooks to move towards each other or away from each other. The second displacement mechanism includes a second slide groove with a convex cross-section at the bottom end of the support beam. Two second sliders that match the second slide groove are slidably connected within the second slide groove. A second lead screw is provided within the second slide groove and is parallel to the support beam. The two ends of the second lead screw are rotatably mounted at the two ends of the support beam. A second displacement motor is located at the end of the support beam. The second displacement motor is driven by the second lead screw, and the two second sliders are threadedly connected to the second lead screw with opposite internal threads. The hooks are hinged to the bottom ends of the second sliders via hinge seats. The second displacement motor is connected to a power source and a PLC controller via a cable. When the second displacement motor is started, it drives the second lead screw to rotate. The second lead screw pushes the two second sliders to move a certain distance towards or away from each other along the second slide groove, thereby adjusting the distance between the two hooks. This mechanism is suitable for lifting objects of different weights.
[0004] Preferably, the bottom of the trolley frame is provided with two vertically and symmetrically arranged fixed pulley brackets, on which a first fixed pulley assembly and a second fixed pulley assembly are rotatably mounted.
[0005] Preferably, both ends of the end beam are detachably equipped with buffers for cushioning.
[0006] The above-mentioned approach has the following advantages: The first displacement mechanism adjusts the distance between the two first sliders, making it suitable for use with lifting drums of different sizes. It eliminates the need to replace the matching lifting device; only the distance between the two moving pulley assemblies needs to be adjusted, thus improving assembly efficiency. The second displacement mechanism adjusts the distance between the two hooks, making it suitable for lifting different weights (different lifting points require adjustment of the distance between the two hooks). The first and second fixed pulley assemblies guide the wire rope. Attached Figure Description
[0007] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 Schematic diagram of the three-dimensional structure of the lifting device Figure 1 ; Figure 3 Schematic diagram of the three-dimensional structure of the lifting device Figure 2 ; Figure 4 This is a schematic diagram of the main structure of the lifting device; Figure 5 for Figure 4 A schematic diagram of the AA-direction cross-sectional structure.
[0008] Reference numerals: 1. Crane bridge; 2. Crane trolley; 3. Lifting device; 4. First displacement mechanism; 5. Second displacement mechanism; 6. Fixed pulley support; 11. Main beam; 111. Trolley travel track; 12. End beam; 121. Buffer; 13. Trolley travel mechanism; 21. Trolley frame; 22. Trolley travel mechanism; 23. Lifting mechanism; 24. Lifting drum; 25. Lifting motor; 31. Support beam; 32. Movable pulley assembly; 321. Movable pulley support; 322. Movable pulley; 33. Hook; 41. First slider; 42. First lead screw; 43. First displacement motor; 51. Second slider; 511. Hinge seat; 52. Second lead screw; 53. Second displacement motor; 61. First fixed pulley assembly; 62. Second fixed pulley assembly. Detailed Implementation
[0009] like Figure 1-5As shown, a double-beam, double-lifting-point bridge crane includes a crane bridge frame 1. The crane bridge frame 1 includes two horizontally spaced main beams 11. End beams 12 are fixed at both ends of the main beams 11. The main beams 11 and the end beams 12 form a U-shaped crane bridge frame 1. A trolley traveling mechanism 13 is provided on the end beams 12. The trolley traveling mechanism 13 includes rotatably mounted trolley traveling wheels on the end beams 12 and a trolley traveling motor fixed on the end beams 12. The trolley traveling wheels are connected to the trolley traveling motor via a transmission. The trolley traveling motor is connected to a power supply and a PLC controller via a cable. A trolley traveling track 111 parallel to the main beams 11 is provided at the top of the main beams 11. The top of the crane bridge 1 is equipped with a lifting trolley 2, and the lifting trolley 2 is equipped with a lifting mechanism 23. The lifting trolley 2 includes a trolley frame 21, and the bottom of the trolley frame 21 is equipped with a trolley traveling mechanism 22. The trolley traveling mechanism 22 includes trolley traveling wheels and a trolley traveling motor. The trolley traveling wheels are rotatably mounted on the trolley frame 21, and the trolley traveling motor is fixed on the trolley frame 21. The power output shaft of the trolley traveling motor is connected to the trolley traveling wheels via a transmission. The trolley traveling motor is connected to the power supply and PLC controller via a cable. The trolley traveling mechanism 22 is movably mounted on the trolley traveling track 111 at the top of the main beam 11. The lifting mechanism 23 includes a lifting drum 24 set at the top of the trolley frame 21. The two ends of the lifting drum 24 are rotatably mounted on the trolley frame 21. It also includes a lifting motor 25 fixed on the trolley frame 21. The lifting motor 25 is connected to the lifting drum 24 via a transmission.A lifting device 3 is provided below the crane bridge 1. The lifting device 3 includes a horizontally arranged support beam 31. Two symmetrically arranged movable pulley assemblies 32 are provided at the upper end of the support beam 31. The movable pulley assembly 32 includes a movable pulley bracket 321 and a movable pulley 322 rotatably mounted on the movable pulley bracket 321. A first displacement mechanism 4 is provided between the two movable pulley assemblies 32 and the support beam 31. The two movable pulley brackets 321 are mounted on the upper end of the support beam 31 through the first displacement mechanism 4, and the first displacement mechanism 4 can synchronously adjust the two movable pulley assemblies 32 to move towards each other or away from each other. Both movable pulley assemblies 32 are connected to the lifting mechanism 23 by wire ropes. The first displacement mechanism 4 includes a first groove with a convex cross-section opened at the top of the support beam 31. Two first sliders 41 that match the first groove are slidably connected in the first groove. The movable pulley brackets 321 are fixed on the first sliders 41, and the first groove is provided with a first slider 41 that matches the support beam 31. A first lead screw 42 is arranged parallel to the support beam 31. The two ends of the first lead screw 42 are rotatably mounted on the two ends of the support beam 31. A first displacement motor 43 is provided at the end of the support beam 31. The first displacement motor 43 is connected to the power supply and PLC controller through a cable. When the first displacement motor 43 is started, it drives the first lead screw 42 to rotate. By changing the rotation direction of the first lead screw 42, the distance between the two first sliders 41 is adjusted. When the first lead screw 42 rotates clockwise, the two first sliders 41 move in opposite directions, and the distance between the two first sliders 41 increases. When the first lead screw 42 rotates counterclockwise, the two first sliders 41 move towards each other, and the distance between the two first sliders 41 decreases. The first displacement motor 43 is connected to the first lead screw 42 through a transmission, and the two first sliders 41 are threadedly connected to the first lead screw 42. The internal threads of the two first sliders 41 are opposite. The movable pulley assembly 32 is installed on the top of the first slider 41.Two symmetrically arranged hooks 33 are provided below the support beam 31. A second displacement mechanism 5 is provided between the hooks 33 and the support beam 31. The two hooks 33 are movably mounted on the support beam 31 through the second displacement mechanism 5, and the second displacement mechanism 5 can synchronously drive the two hooks 33 to move towards each other or away from each other. The second displacement mechanism 5 includes a second sliding groove with a convex cross-section opened at the bottom end of the support beam 31. Two second sliding blocks 51 that match the second sliding groove are slidably connected in the second sliding groove, and a second lead screw 52 arranged parallel to the support beam 31 is provided in the second sliding groove. The two ends of the second lead screw 52 are rotatably mounted on the two ends of the support beam 31. The end of 1 is provided with a second displacement motor 53, which is connected to the second lead screw 52 for transmission. The two second sliders 51 are threadedly connected to the second lead screw 52, and the internal threads of the two second sliders 51 are opposite. The hook 33 is hinged to the bottom end of the second slider 51 through the hinge seat 511. The second displacement motor 53 is connected to the power supply and PLC controller through the cable. When the second displacement motor 53 is started, the second displacement motor 53 drives the second lead screw 52 to rotate. The second lead screw 52 pushes the two second sliders 51 to move a certain distance along the second slide groove in opposite directions, thereby adjusting the distance between the two hooks 33. This makes it suitable for lifting different weights.
[0010] Preferably, the bottom end of the trolley frame 21 is provided with two vertically and symmetrically arranged fixed pulley brackets 6, and the fixed pulley brackets 6 are rotatably equipped with a first fixed pulley assembly 61 and a second fixed pulley assembly 62.
[0011] Preferably, both ends of the end beam 12 are detachably equipped with buffers 121 for buffering.
[0012] Usage process: In use, the distance between the two movable pulley assemblies 32 on the lifting device 3 is adjusted according to the usage requirements. The first displacement motor 43 is started, which drives the first lead screw 42 to rotate. By changing the rotation direction of the first lead screw 42, the distance between the two first sliders 41 is adjusted. When the first lead screw 42 rotates clockwise, the two first sliders 41 move in opposite directions, increasing the distance between them. When the first lead screw 42 rotates counterclockwise, the two first sliders 41 move towards each other, decreasing the distance between them. Once the positions of the two movable pulley assemblies 32 are adjusted... Then, the wire rope is connected to the hoisting drum 24; then the distance between the two hooks 33 is adjusted, the second displacement motor 53 is started, the second displacement motor 53 drives the second lead screw 52 to rotate, the second lead screw 52 pushes the two second sliders 51 to move a certain distance along the second slide groove towards or away from each other, so that the distance between the two hooks 33 can be adjusted, which can be used to lift different weights. The trolley traveling mechanism 13 can drive the crane bridge 1 to move longitudinally, and the trolley traveling mechanism 22 can drive the crane trolley 2 to move laterally along the trolley traveling track 111 at the top of the main beam 11.
[0013] 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.
[0014] 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 double-beam, double-lifting-point bridge crane, comprising a crane bridge frame, with a trolley traveling mechanism at both ends of the crane bridge frame, and a lifting trolley at the top of the crane bridge frame, the lifting trolley being equipped with a hoisting mechanism, characterized in that: The crane bridge is equipped with a lifting device below it, which includes a horizontally arranged support beam. Two symmetrically arranged movable pulley assemblies are located at the upper end of the support beam. A first displacement mechanism is provided between the two movable pulley assemblies and the support beam. The two movable pulley assemblies are mounted on the upper end of the support beam via the first displacement mechanism, which can synchronously adjust the two movable pulley assemblies to move towards or away from each other. Both movable pulley assemblies are connected to the hoisting mechanism via wire ropes. Two symmetrically arranged hooks are located below the support beam. A second displacement mechanism is provided between the hooks and the support beam. The two hooks are movably mounted on the support beam via the second displacement mechanism, which can synchronously drive the two hooks to move towards or away from each other.
2. A double-beam, double-lifting-point bridge crane according to claim 1, characterized in that: The first displacement mechanism includes a first groove with a convex cross-section opened at the top of the support beam. Two first sliders that match the first groove are slidably connected in the first groove. A first lead screw is provided in the first groove and is arranged parallel to the support beam. The two ends of the first lead screw are rotatably mounted on the two ends of the support beam. A first displacement motor is provided at the end of the support beam. The first displacement motor is drivenly connected to the first lead screw. The two first sliders are threadedly connected to the first lead screw, and the internal threads of the two first sliders are opposite. A movable pulley assembly is installed at the top of the first slider.
3. A double-beam, double-lifting-point bridge crane according to claim 1, characterized in that: The second displacement mechanism includes a second sliding groove with a convex cross-section opened at the bottom end of the support beam. Two second sliding blocks that match the second sliding groove are slidably connected in the second sliding groove. A second lead screw is provided in the second sliding groove and is arranged parallel to the support beam. The two ends of the second lead screw are rotatably mounted on the two ends of the support beam. A second displacement motor is provided at the end of the support beam. The second displacement motor is connected to the second lead screw through a transmission. The two second sliding blocks are threadedly connected to the second lead screw, and the internal threads of the two second sliding blocks are opposite. The hook is hinged to the bottom end of the second sliding block through a hinge seat.
4. A double-beam, double-lifting-point bridge crane according to claim 1, characterized in that: The crane bridge includes two horizontally spaced main beams, with end beams fixed at both ends of the main beams. The main beams and end beams form a U-shaped crane bridge, and the end beams are equipped with a trolley traveling mechanism. The top of the main beams is equipped with a trolley traveling track parallel to the main beams.
5. A double-beam, double-lifting-point bridge crane according to claim 4, characterized in that: The crane trolley includes a trolley frame, and a trolley traveling mechanism is provided at the bottom of the trolley frame. The trolley traveling mechanism is movably mounted on the trolley traveling track at the top of the main beam.
6. A double-beam, double-lifting-point bridge crane according to claim 5, characterized in that: The lifting mechanism includes a lifting drum mounted on the top of the trolley frame, with both ends of the lifting drum rotatably mounted on the trolley frame, and a lifting motor fixed on the trolley frame, which is connected to the lifting drum via a drive.
7. A double-beam, double-lifting-point bridge crane according to claim 5, characterized in that: The bottom of the car frame is provided with two vertically and symmetrically arranged fixed pulley brackets, on which a first fixed pulley assembly and a second fixed pulley assembly are rotatably mounted.
8. A double-beam, double-lifting-point bridge crane according to claim 4, characterized in that: Both ends of the end beam are detachably equipped with buffers for cushioning.