Hydraulic lifting container gantry crane

Abstract

The invention discloses a hydraulic lifting container gantry crane which comprises a gantry crane main beam, a movable trolley frame is arranged on the gantry crane main beam, two trolley wheel sets in rolling contact with the gantry crane main beam are installed on each of the left side and the right side of the bottom of the trolley frame, and a container lifting appliance is arranged below the trolley frame. Through the driving of the hydraulic cylinder and the design of the pulley blocks, the distance from the lifting point of the lifting appliance to the highest point of the crane is reduced to be less than or equal to 3.2 m, under the safety distance of 8.3 m clearance, the lifting height of 5000 mm can still be realized, the problem of low clearance scene pain points is solved, when the workshop clearance is relatively high, four movable pulley blocks are selected, and when the workshop clearance is only 8.3 m, a container with the full load of 20 feet needs to be carried. The lifting requirement can be met by switching to six movable pulley sets, the whole lifting mechanism does not need to be replaced, the gantry crane is suitable for carrying scenes of containers with different clearances and different specifications, and the flexibility of the gantry crane is far better than that of a traditional winch type gantry crane.

Description

Technical Field

[0001] This invention relates to the field of container gantry crane technology, specifically a hydraulic lifting container gantry crane. Background Technology

[0002] Container gantry cranes are core equipment used for lifting and handling containers in ports, factories, and other similar settings. Traditional container gantry cranes generally adopt a winch-type lifting structure, whose core components include a winch, electric motor, gearbox, and wire rope pulley block. The disadvantage of this type of structure is that the distance from the lifting point of the spreader to the highest point of the winch usually needs to be greater than 5.5m to ensure the normal operation of the winch system.

[0003] For example, application number CN202311226647.1 discloses a rail-mounted container gantry crane, which relates to the field of lifting equipment technology. The container spreader includes a base frame and a telescopic clamping frame; it also includes a shifting camera assembly; the shifting camera assembly includes a load-bearing cylinder, a winding drum, a connecting belt, a load-bearing block, and a shooting and monitoring unit; the load-bearing cylinder is a hollow cylinder, arranged horizontally, and fixed on the telescopic clamping frame; the winding drum is positioned inside the load-bearing cylinder; the connecting belt is a soft belt with a width greater than 10 cm, one end of which is fixed on the winding drum, and the other end is fixed on the load-bearing block; the load-bearing block is provided with a cylindrical wheel, and the cylindrical wheel has a built-in magnet.

[0004] In the above case, the gantry crane is used in industrial plant scenarios where the clearance height of some old or special process plants is only 8.3m. However, the lifting and handling of a fully loaded 20-foot standard container requires a lifting height of at least 4.5m. If a winch-type gantry crane is used, a safety distance of 100mm must be reserved between the highest point of the crane and the plant. In this case, the actual available lifting space is: 8.3m - 0.1m - 5.5m = 2.7m, which is far less than the requirement of 4.5m and cannot complete the normal lifting and handling of the container. Therefore, we provide a hydraulic lifting container gantry crane. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic lifting container gantry crane to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic lifting container gantry crane, comprising a gantry crane main beam, a movable trolley frame mounted on the gantry crane main beam, two trolley wheel sets mounted on the left and right sides of the bottom of the trolley frame that roll in contact with the gantry crane main beam, a container spreader mounted below the trolley frame, and a drive lifting assembly mounted on the trolley frame, the drive lifting assembly being used to drive the container spreader to move up and down.

[0007] Preferably, the drive lifting assembly includes two movable pulley support running rails, which are respectively installed on the left and right sides of the top of the trolley frame, and movable pulley groups are provided on the movable pulley support running rails.

[0008] Preferably, two moving pulley support running wheels that cooperate with the moving pulley support running rail are installed on both the left and right sides of the moving pulley support, and two moving pulley support horizontal guide wheels that cooperate with the moving pulley support running rail are installed at the bottom of the moving pulley support.

[0009] Preferably, the drive lifting assembly further includes a hydraulic cylinder, two static pulley blocks, a wire rope fixing ring, and a guide pulley block. The hydraulic cylinder is two in number and is respectively installed on the top of the trolley frame. The output end of the hydraulic cylinder is fixedly connected to the support of the moving pulley block.

[0010] Preferably, the stationary pulley group is installed on the front side of the top of the trolley frame and corresponds to the position of the movable pulley group; the number of guide pulley groups is four and they are respectively installed at the bottom of the trolley frame; and the number of wire rope fixing rings is four and they are respectively installed on the supports of the two movable pulley groups.

[0011] Preferably, a wire rope body is wound and installed on the wire rope fixing ring. The end of the wire rope body away from the wire rope fixing ring passes through the movable pulley block, the stationary pulley block and the guide pulley block in sequence and extends to the outside of the guide pulley block. The bottom ends of the four wire rope bodies are wound and fixedly connected to the four fixing rings on the container spreader.

[0012] Preferably, the number of movable pulley groups is four or six. When there are four movable pulley groups, the hydraulic cylinder stroke is 1000mm and the lifting height is 3000mm. When there are six movable pulley groups, the hydraulic cylinder stroke is 1000mm and the lifting height is 5000mm.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. This invention, through hydraulic cylinder drive and pulley block design, reduces the distance from the lifting point of the spreader to the highest point of the crane to ≤3.2m. Even with a safe clearance of 8.3m, a lifting height of 5000mm can still be achieved, solving the pain points of low clearance scenarios. Furthermore, the hydraulic cylinder drive eliminates the need for a winch, motor, and gearbox, reducing the number of transmission components, maintenance costs, and the probability of failure. When the factory clearance is high, such as over 10m, and the lifting requirement is low, such as when moving a 10-foot small container requiring a lifting height of 2.5m-3m, four sets of movable pulley blocks can be used to reduce the load on the hydraulic cylinder and lower energy consumption. When the factory clearance is only 8.3m and a fully loaded 20-foot container needs to be moved, requiring a lifting height of ≥4.5m, switching to six sets of movable pulley blocks can meet the lifting requirements without replacing the entire lifting mechanism. This invention is adaptable to handling scenarios with different clearances and container sizes, offering far greater flexibility than traditional winch-type gantry cranes.

[0015] 2. This invention uses two running wheels on the left and right sides of the movable pulley support to roll into contact with the square rail, and two horizontal guide wheels at the bottom to closely adhere to the side of the square rail. This not only restricts the vertical movement of the movable pulley block but also avoids lateral deviation. At the same time, it ensures that the force on the spreader is evenly distributed across the four suspension points. When fully loaded with a 20-foot standard container, weighing approximately 30.48 tons, the spreader's horizontal deviation is ≤1°, completely avoiding the risk of cargo scattering or spreader damage caused by container tilting. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention (front view).

[0017] Figure 2 This is a schematic diagram of the structure from the side view of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the container spreader of the present invention in its working state, viewed from the side.

[0019] Figure 4 This is a three-dimensional structural diagram of the four sets of movable pulleys of the present invention in use;

[0020] Figure 5 This is a three-dimensional structural diagram of the six sets of movable pulleys of the present invention in use.

[0021] In the diagram: 1. Gantry crane main beam; 100. Trolley frame; 101. Trolley wheel assembly; 102. Container spreader; 2. Drive lifting assembly; 21. Moving pulley support running rail; 22. Moving pulley block; 23. Moving pulley support running wheel; 24. Moving pulley support horizontal guide wheel; 25. Hydraulic cylinder; 26. Static pulley block; 27. Wire rope fixing ring; 28. Guide pulley block; 29. ​​Wire rope body. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1-5 A hydraulic lifting container gantry crane includes a gantry crane main beam 1, which is supported by gantry crane outriggers. These outriggers can move laterally on external guide rails via an external drive structure. The main beam 1 provides a lateral movement track for a trolley frame 100, constraining its movement path and ensuring smooth movement along the length of the main beam. A movable trolley frame 100 is mounted on the main beam 1. The trolley frame 100 integrates all the core components of the lifting drive assembly 2, forming a modular layout of the lifting system to facilitate collaborative work between components. Two trolley wheel sets 101 are installed on the left and right sides of the bottom, which roll in contact with the main beam 1 of the gantry crane. The trolley wheel sets 101 realize the rolling contact between the trolley frame 100 and the main beam 1 of the gantry crane, and change the moving friction of the trolley frame 100 from sliding friction to rolling friction, thereby reducing the moving resistance. A container spreader 102 is set below the trolley frame 100. The container spreader 102 is used to place containers and at the same time transmit the lifting force of the wire rope body 29 to realize the grabbing and handling of containers. A drive lifting assembly 2 is set on the trolley frame 100, which is used to drive the container spreader 102 to move up and down.

[0024] The drive lifting assembly 2 includes two movable pulley support running rails 21, which are respectively installed on the left and right sides of the top of the trolley frame 100. The movable pulley support running rails 21 provide a dedicated moving track for the movable pulley group 22, limiting its movement to only along the length of the rail and preventing it from moving up and down or left and right. Movable movable pulley groups 22 are installed on the movable pulley support running rails 21. The movable pulley groups 22 are wound and engaged with the wire rope body 29, amplifying the lifting stroke of the hydraulic cylinder 25 through a multiplier effect. The lifting height = hydraulic cylinder 25 stroke × multiplier, transmitting the driving force of the hydraulic cylinder 25 to drive the wire rope body 29 to pull the container spreader 102 up and down. It supports switching between four and six sets of movable pulley groups 22. Two movable pulley support running wheels 23 are installed on both the left and right sides of the support, which cooperate with the moving pulley support running rail 21. The moving pulley support running wheels 23 enable the movable pulley group 22 to form rolling contact with the moving pulley support running rail 21 through the wheels, reducing movement resistance, bearing the vertical load of the movable pulley group 22, and avoiding component damage caused by direct friction between the movable pulley group 22 support and the rail. Two movable pulley support horizontal guide wheels 24 are installed at the bottom of the movable pulley support 22, which cooperate with the moving pulley support running rail 21. The movable pulley support horizontal guide wheels 24 are close to the side of the movable pulley support running rail 21, restricting the lateral displacement of the movable pulley group 22. Cooperating with the movable pulley support running wheels 23, they form a double constraint of vertical and horizontal constraints. The guide structure ensures stable movement of the movable pulley block 22 along the square rail. The lifting drive assembly 2 also includes a hydraulic cylinder 25, two stationary pulley blocks 26, a wire rope fixing ring 27, and a guide pulley block 28. Two hydraulic cylinders 25 are installed on the top of the trolley frame 100. The output end of each hydraulic cylinder 25 is fixedly connected to the support of the movable pulley block 22. The hydraulic cylinder 25 provides the lifting driving force, which pushes the movable pulley block 22 along the running square rail 21 of the movable pulley support through the extension and retraction of the piston rod, replacing the winch, motor, and gearbox combination of a traditional winch-type gantry crane. The stationary pulley blocks 26 are installed on the front side of the top of the trolley frame 100, corresponding to the position of the movable pulley block 22. The stationary pulley blocks 26 change the winding direction of the wire rope body 29, forming a complete system with the movable pulley block 22. The multiplier transmission system bears the tension of the wire rope, avoids local stress concentration caused by sudden changes in the direction of the wire rope, protects the wire rope body 29, and simplifies the transmission structure of the hoisting system. Four guide pulley blocks 28 are installed at the bottom of the trolley frame 100. The guide pulley blocks 28 change the direction of the wire rope body 29 from the stationary pulley block 26 to the container spreader 102, guiding the wire rope vertically downwards, constraining the lateral deviation of the wire rope, ensuring that the four wire ropes are lowered or raised synchronously, and maintaining the spreader's level. Four wire rope fixing rings 27 are installed on the supports of two movable pulley blocks 22. The wire rope fixing rings 27 fix one end of the wire rope body 29, forming a firm connection between the wire rope and the movable pulley block 22 supports, preventing the wire rope from loosening.A wire rope body 29 is wound and installed on the wire rope fixing ring 27. The end of the wire rope body 29 away from the wire rope fixing ring 27 passes sequentially through the movable pulley block 22, the stationary pulley block 26, and the guide pulley block 28, extending to the outside of the guide pulley block 28. The wire rope body 29 transmits the driving force of the hydraulic cylinder 25 to achieve the lifting and lowering of the spreader. The bottom ends of the four wire rope bodies 29 are wound and fixedly connected to four fixing rings on the container spreader 102. There are four sets of movable pulley blocks 22. In this case, the stroke of the hydraulic cylinder 25 is 1000mm, and the lifting height is 3000mm. In this case, there are six sets of movable pulley blocks 22. In this case, the stroke of the hydraulic cylinder 25 is 1000mm, and the lifting height is 5000mm.

[0025] When using the equipment, the number of movable pulley blocks 22 should be determined based on the factory's net height and the container's specifications: If the factory's net height is only 8.3m, in an older factory setting, and a fully loaded 20-foot container needs to be moved, requiring a lifting height of ≥4.5m, then six movable pulley blocks 22 should be installed, corresponding to a 1000mm stroke of the hydraulic cylinder 25, which can achieve a lifting height of 5000mm; if the factory's net height is ≥10m, and a small 10-foot container needs to be moved, requiring a lifting height of 2.5m-3m, then four movable pulley blocks 22 should be installed to reduce the load on the hydraulic cylinder 25 and reduce energy consumption.

[0026] Two hydraulic cylinders 25 are activated to control the piston rods to extend synchronously and push the support of the movable pulley block 22 to move along the movable pulley support running rail 21. At this time, the movable pulley support running wheel 23 rolls along the movable pulley support running rail 21, and the horizontal guide wheel at the bottom rolls at the same time. The double constraint ensures that the movable pulley block 22 does not move up or down or shift laterally.

[0027] When the movable pulley block 22 moves, it drives the steel wire rope body 29 wound on it to move. One end of the steel wire rope is fixed to the steel wire rope fixing ring 27, which drives the container spreader 102 to descend, so that the container is placed on the container spreader 102. Then, the hydraulic cylinder 25 drives the pulley block 22 to retract, so that the container spreader 102 rises. After rising to a suitable height, the trolley frame 100 is activated to drive laterally. The position of the trolley wheel block 101 is finely adjusted along the main beam to make the container accurately align with the target placement point. During the movement, the guide pulley block 28 constrains the steel wire rope to prevent the spreader from swaying. Then, the hydraulic cylinder 25 extends. When the container moves downward, after the container has completely landed, the hydraulic cylinder 25 stops moving, the container spreader 102 is disconnected from the container, and the single handling is completed.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic lifting container gantry crane, characterized in that: The system includes a gantry crane main beam (1), on which a movable trolley frame (100) is provided. Two trolley wheel sets (101) that roll in contact with the gantry crane main beam (1) are installed on the left and right sides of the bottom of the trolley frame (100). A container spreader (102) is provided below the trolley frame (100). A drive lifting assembly (2) is provided on the trolley frame (100). The drive lifting assembly (2) is used to drive the container spreader (102) to move up and down.

2. The hydraulic lifting container gantry crane according to claim 1, characterized in that: The drive lifting assembly (2) includes a movable pulley support running rail (21), and there are two movable pulley support running rails (21) installed on the left and right sides of the top of the trolley frame (100) respectively. Movable movable pulley groups (22) are provided on the movable pulley support running rails (21).

3. The hydraulic lifting container gantry crane according to claim 2, characterized in that: The left and right sides of the movable pulley block (22) support are each equipped with two movable pulley support running wheels (23) that cooperate with the movable pulley support running rail (21). The bottom of the movable pulley block (22) support is equipped with two movable pulley support horizontal guide wheels (24) that cooperate with the movable pulley support running rail (21).

4. The hydraulic lifting container gantry crane according to claim 3, characterized in that: The drive lifting assembly (2) also includes a hydraulic cylinder (25), two static pulley groups (26), a wire rope fixing ring (27), and a guide pulley group (28). There are two hydraulic cylinders (25) installed on the top of the trolley frame (100), and the output end of the hydraulic cylinder (25) is fixedly connected to the support of the moving pulley group (22).

5. The hydraulic lifting container gantry crane according to claim 4, characterized in that: The stationary pulley group (26) is installed on the front side of the top of the trolley frame (100) and corresponds to the position of the movable pulley group (22). There are four guide pulley groups (28) installed at the bottom of the trolley frame (100). There are four wire rope fixing rings (27) installed on the supports of the two movable pulley groups (22).

6. The hydraulic lifting container gantry crane according to claim 5, characterized in that: The wire rope fixing ring (27) is wound with wire rope bodies (29). The end of the wire rope body (29) away from the wire rope fixing ring (27) passes through the movable pulley block (22), the stationary pulley block (26) and the guide pulley block (28) in sequence and extends to the outside of the guide pulley block (28). The bottom ends of the four wire rope bodies (29) are wound and fixedly connected to the four fixing rings on the container spreader (102).

7. The hydraulic lifting container gantry crane according to claim 6, characterized in that: The number of movable pulley groups (22) is four or six. When there are four movable pulley groups (22), the stroke of the hydraulic cylinder (25) is 1000mm and the lifting height is 3000mm. When there are six movable pulley groups (2), the stroke of the hydraulic cylinder (25) is 1000mm and the lifting height is 5000mm.

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