Double-box synchronous hydraulic turnover spreader for port crane

Abstract

The present application belongs to the technical field of container spreader, especially to a double-box synchronous hydraulic turnover spreader for port crane, comprising a crossbeam, a suspension upper frame is installed on the top of the crossbeam, two symmetrically distributed V-shaped frames I are slidingly installed below the crossbeam, one same pushing mechanism is arranged between the two V-shaped frames I, the V-shaped frame I and the pushing mechanism are slidingly connected with the crossbeam through two rolling mechanisms; a clamping mechanism for fixing the container box is rotatably installed below each of the two V-shaped frames I, and the rotating directions of the two clamping mechanisms are opposite. The horizontal positions of the containers below the two clamping mechanisms are adjusted in real time, so that the overall gravity centers of the two containers are always located directly below the center of the crossbeam, thereby ensuring that the device maintains a horizontal posture during the whole dumping process, solving the problem of device inclination caused by uneven force on both sides, and significantly improving the stability and controllability of the device operation.

Description

Technical Field

[0001] This invention relates to the field of container spreader technology, and in particular to a dual-box synchronous hydraulic tilting spreader for port cranes. Background Technology

[0002] With the rapid development of global trade, the volume of container transportation at ports continues to grow, leading to increasingly higher demands for loading and unloading efficiency. Traditional single-container loading and unloading methods are no longer sufficient to meet the growing logistics needs, giving rise to spreaders capable of simultaneous dual-container operations. Dual-container hydraulic tilting spreaders can simultaneously grab two containers and perform unloading operations, making them particularly suitable for scenarios such as bulk cargo loading. They can significantly improve loading and unloading efficiency and reduce operating costs. For example, patent application number 202010769997.2 discloses a dual-container hydraulic tilting spreader for container cranes.

[0003] In actual operation, due to differences in the type, density, moisture content, and stacking pattern of materials in the two containers, or deviations in the pressure and flow output of the hydraulic systems of the two tilting cylinders, the two containers often exhibit different tilting speeds during unloading. Specifically, when the material in one container has better flowability, the tilting frame on that side will complete the tilting action first; while if the material in the other container has stronger adhesion, the tilting speed will be significantly slower. This inconsistency in unloading speed directly leads to uneven force on both sides of the spreader, which in turn causes the spreader body to twist or tilt. The tilt of the spreader not only aggravates the mechanical wear between the container and the spreader, but may also cause safety hazards such as container lock jamming and material spillage. In extreme cases, excessive load difference on both sides may even lead to deformation of the spreader structure or damage to the hydraulic system, seriously affecting operational safety and equipment life. Therefore, a double-box synchronous hydraulic tilting spreader for port cranes is proposed. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, this invention proposes a double-box synchronous hydraulic tilting device for port cranes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a double-box synchronous hydraulic tilting spreader for a port crane, comprising a crossbeam, a suspended upper frame installed on the top of the crossbeam, and two symmetrically distributed U-shaped frames slidably installed below the crossbeam, with a common pushing mechanism between the two U-shaped frames slidably connected to the crossbeam via two rolling mechanisms. Each of the two U-shaped frames is rotatably mounted with a clamping mechanism for fixing the container chassis. The two clamping mechanisms rotate in opposite directions. The pushing mechanism is used to push the two U-shaped frames to move synchronously in opposite directions. An inclination sensor for detecting the left and right tilt angle of the crossbeam is embedded and fixedly installed at the top center of the crossbeam. A hydraulic cylinder is fixedly installed on the top of the crossbeam to push the pushing mechanism to move left and right. The hydraulic cylinder is used to push the pushing mechanism to make the two U-shaped frames move synchronously in the same direction.

[0006] Preferably, the clamping mechanism includes a hinge seat 1 fixed to the bottom of the U-shaped frame 1 and a flipping frame disposed below the hinge seat 1. A hinge seat 2 is fixedly installed on the top of the flipping frame. The hinge seat 1 and the hinge seat 2 are rotatably connected. The flipping frame is hinged to both sides of the U-shaped frame 1 through two hydraulic cylinders 2. Side frames are fixedly installed on both sides of the flipping frame, and side plates are fixedly installed at the ends of the two side frames that are far apart from each other.

[0007] Preferably, the side plate is provided with two rotary locks.

[0008] Preferably, two door opening and closing devices are fixedly installed on the rotary lock away from the hinge seat 2.

[0009] Preferably, the pushing mechanism includes a U-shaped frame two that is slidably sleeved on the crossbeam, a rolling mechanism located in the pushing mechanism that is fixedly connected to the inner wall of the U-shaped frame two, and two hydraulic cylinders three that are fixedly installed on both sides of the U-shaped frame two. The two hydraulic cylinders three located on the same side are mirror images of each other, and the piston rod ends of the two hydraulic cylinders three located on the same side are respectively hinged to the corresponding U-shaped frame one.

[0010] Preferably, a horizontal plate is fixedly installed on the top of the second U-shaped frame, the second U-shaped frame is located above the crossbeam, and the end of the piston rod of the first hydraulic cylinder is hinged to the center of the top of the horizontal plate.

[0011] Preferably, the rolling mechanism includes a U-shaped wheel frame, on which horizontally arranged load-bearing wheels are rotatably mounted on both inner walls of the U-shaped wheel frame, and on both sides of the crossbeam, channel steel rails are fixedly mounted, with the two load-bearing wheels on the rolling mechanism respectively rolling in the corresponding channel steel rails.

[0012] Preferably, two longitudinally arranged limiting wheels are rotatably installed on the inner walls of both sides of the U-shaped wheel frame, with the two load-bearing wheels located between the corresponding two limiting wheels, and the limiting wheels abutting against the side wall of the channel steel track.

[0013] Preferably, a mounting box is embedded and fixedly installed at the top center of the crossbeam. The top of the mounting box is open. The tilt sensor is fixedly installed inside the mounting box. A protective cover is detachably installed on the top of the mounting box.

[0014] Preferably, the suspended frame includes a rectangular frame fixedly installed on the top of the crossbeam, and the top of the rectangular frame is provided with a plurality of pulleys arranged in a rectangular shape, with slings wound around the pulleys.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention adjusts the horizontal position of the containers below the two clamping mechanisms in real time, ensuring that the overall center of gravity of the two containers is always directly below the center of the crossbeam. This guarantees that the device maintains a horizontal posture throughout the unloading process, solves the problem of tilting caused by uneven force on both sides, and significantly improves the stability and controllability of the device's operation.

[0016] This invention eliminates the tilted operation of the device, thus preventing key components from being subjected to abnormal lateral forces and impact loads, thereby significantly reducing mechanical wear and fatigue damage. Simultaneously, it avoids malfunctions such as lock jamming, inability to reset, or abnormal unlocking caused by tilting, reducing equipment maintenance frequency and replacement costs, and extending the service life of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a double-box synchronous hydraulic tilting spreader for a port crane proposed in this invention; Figure 2 This is a schematic diagram of the clamping mechanism, the U-shaped frame, and multiple rolling mechanisms in a double-box synchronous hydraulic tilting spreader for a port crane proposed in this invention. Figure 3 This is a schematic diagram of the crossbeam, pushing mechanism, and cylinder 1 in a double-box synchronous hydraulic tilting spreader for a port crane proposed in this invention. Figure 4 This is a schematic diagram of the crossbeam, pushing mechanism, tilt sensor and multiple rolling mechanisms in a double-box synchronous hydraulic tilting spreader for a port crane proposed in this invention. Figure 5 This is a schematic diagram of the rolling mechanism in a double-box synchronous hydraulic tilting spreader for a port crane proposed in this invention; Figure 6 This is a side view of the crossbeam and rolling mechanism in a double-box synchronous hydraulic tilting spreader for a port crane proposed in this invention; Figure 7 This is a schematic diagram of the structure of a port crane using a double-box synchronous hydraulic tilting spreader to clamp two containers, as proposed in this invention.

[0018] In the diagram: 1. Crossbeam; 2. Suspension frame; 3. Clamping mechanism; 4. Pushing mechanism; 5. Rolling mechanism; 6. Tilt sensor; 7. U-shaped frame one; 8. Hydraulic cylinder one; 11. Channel steel rail; 12. Mounting box; 21. Rectangular frame; 22. Pulley; 23. Lifting sling; 31. Hinge base one; 32. Hinge base two; 33. Tilting frame; 34. Side frame; 35. Side plate; 36. Rotary lock; 37. Door opening and closing device; 38. Hydraulic cylinder two; 41. U-shaped frame two; 42. Hydraulic cylinder three; 43. Horizontal plate; 51. U-shaped wheel frame; 52. Limiting wheel; 53. Load-bearing wheel. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described 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.

[0020] Please refer to Figures 1-7 The present invention provides a technical solution: a double-box synchronous hydraulic tilting spreader for a port crane, comprising a crossbeam 1, a suspended upper frame 2 installed on the top of the crossbeam 1, and two symmetrically distributed U-shaped frames 7 slidably installed below the crossbeam 1. The two U-shaped frames 7 are provided with the same pushing mechanism 4 between them. Both the U-shaped frames 7 and the pushing mechanism 4 are slidably connected to the crossbeam 1 through two rolling mechanisms 5. Below each of the two U-shaped frames 7, there is a clamping mechanism 3 for fixing the container chassis. The two clamping mechanisms 3 rotate in opposite directions. The pushing mechanism 4 is used to push the two U-shaped frames 7 to move synchronously in opposite directions. An inclination sensor 6 for detecting the left and right tilt angle of the crossbeam 1 is embedded and fixedly installed at the top center of the crossbeam 1. A hydraulic cylinder 8 for pushing the pushing mechanism 4 to move left and right is fixedly installed on the top of the crossbeam 1. The hydraulic cylinder 8 is used to push the pushing mechanism 4 to make the two U-shaped frames 7 move synchronously in the same direction.

[0021] The clamping mechanism 3 includes a hinge seat 31 fixed to the bottom of the U-shaped frame 7 and a flipping frame 33 disposed below the hinge seat 31. A second hinge seat 32 is fixedly installed on the top of the flipping frame 33. The first hinge seat 31 and the second hinge seat 32 are rotatably connected. The flipping frame 33 is hinged to both sides of the U-shaped frame 7 through two hydraulic cylinders 38. Side frames 34 are fixedly installed on both sides of the flipping frame 33. Side plates 35 are fixedly installed at the ends of the two side frames 34 that are far apart from each other.

[0022] Two rotary locks 36 are provided on the side plate 35.

[0023] Furthermore, the rotary lock 36 is a common industry practice and is not within the scope of protection of this application, so it will not be discussed in detail here.

[0024] Two door opening and closing devices 37 are fixedly installed on the rotary lock 36, which is away from the hinge seat 32.

[0025] Furthermore, the door opening and closing device 37 can refer to the door blocking mechanism and door opening mechanism in the prior art documents, which are common in the industry and are not within the scope of protection of this application, so they will not be elaborated on here.

[0026] The pushing mechanism 4 includes a U-shaped frame 41 that is slidably sleeved on the crossbeam 1. The rolling mechanism 5 located inside the pushing mechanism 4 is fixedly connected to the inner wall of the U-shaped frame 41. Two hydraulic cylinders 42 are fixedly installed on both sides of the U-shaped frame 41. The two hydraulic cylinders 42 on the same side are mirror images of each other. The piston rod ends of the two hydraulic cylinders 42 on the same side are respectively hinged to the corresponding U-shaped frame 7.

[0027] A horizontal plate 43 is fixedly installed on the top of the U-shaped frame 2 41. The U-shaped frame 2 41 is located above the crossbeam 1. The end of the piston rod of the hydraulic cylinder 1 8 is hinged to the center of the top of the horizontal plate 43.

[0028] The rolling mechanism 5 includes a U-shaped wheel frame 51, on which horizontally arranged load-bearing wheels 53 are rotatably installed on both sides of the inner wall of the U-shaped wheel frame 51. Channel steel rails 11 are fixedly installed on both sides of the crossbeam 1. The two load-bearing wheels 53 on the rolling mechanism 5 are respectively rolled in the corresponding channel steel rails 11.

[0029] Two longitudinally arranged limit wheels 52 are rotatably installed on the inner walls of both sides of the U-shaped wheel frame 51. Two load-bearing wheels 53 are respectively located between the two corresponding limit wheels 52, and the limit wheels 52 abut against the side wall of the channel steel rail 11.

[0030] An installation box 12 is embedded and fixedly installed at the top center of the crossbeam 1. The top of the installation box 12 is open. The tilt sensor 6 is fixedly installed inside the installation box 12. The top of the installation box 12 is detachably covered.

[0031] Furthermore, the tilt sensor 6 is set at the center of the crossbeam 1 to monitor the left and right tilt angles of the crossbeam 1 in real time. When the two clamping mechanisms 3 lift two containers for unloading, if the tilt sensor 6 detects that the crossbeam 1 is in a horizontal state. When beam 1 is horizontal, with the center of beam 1 as the fulcrum, the moments on the left and right sides must be equal: The calculation formula is: G_left × L_left = G_right × L_right; G left, G right: The weight borne by the left and right sides of beam 1; L left, L right: The horizontal distance from the center of the lifting point to the center of gravity of the left clamping mechanism 3 and the center of gravity of the right clamping mechanism 3.

[0032] If the tilt sensor 6 detects that the crossbeam 1 is tilted, to make the crossbeam 1 horizontal, the center of gravity of the containers clamped by the two clamping mechanisms 3 must be directly below the center of the crossbeam 1. The formula for adjusting the center of gravity of the two containers is: The distance of the center of gravity offset = (L / 2) × tanθ; Where: θ is the tilt angle of beam 1 (which can be measured by tilt sensor 6), and L is the effective length of beam 1; For example: If beam 1 is 10 meters long, and one end is 0.3 meters lower than the other end, then: tanθ≈0.3 / 10=0.03; The distance of the center of gravity shift is approximately 10 / 2 × 0.03 = 0.15 meters; This indicates that the center of gravity is off by about 15 centimeters, and the container on the lower side needs to be moved about 15 centimeters to the higher side.

[0033] The suspended frame 2 includes a rectangular frame 21 fixedly installed on the top of the crossbeam 1. The top of the rectangular frame 21 is provided with multiple pulleys 22 arranged in a rectangular shape, and slings 23 are wound around the pulleys 22.

[0034] In this embodiment: when the container is clamped and fixed by the clamping mechanism 3, the four rotary locks 36 are respectively inserted into the four corner fitting holes on the top of the container, and the container is fixed by the cooperation of the four rotary locks 36 and the corresponding corner fitting holes; like Figure 7 As shown, the containers fixed on the two clamping mechanisms 3 can then be lifted by the suspension frame 2 in conjunction with the port crane. When the materials inside the two containers are being poured out, the hydraulic cylinders 38 on the two clamping mechanisms 3 are extended. At this time, the left clamping mechanism 3 will drive the corresponding container to rotate counterclockwise, and the right clamping mechanism 3 will drive the corresponding container to rotate clockwise. As mentioned above, when the two containers tilt, the two opening and closing door devices 37 on the corresponding clamping mechanism 3 will control the opening of the container doors of the corresponding containers. As the container doors open, the materials inside the containers will be unloaded.

[0035] like Figure 7 As shown, when the containers on the left and right sides are unloading materials, if the unloading speeds are different, the device will tilt due to the weight difference between the left and right sides. At this time, the tilt sensor 6 detects the tilt of the crossbeam 1, and the hydraulic cylinder 8 will extend and retract accordingly. The extension and retraction of the hydraulic cylinder 8 will drive the two U-shaped frames 7 to move synchronously through the pushing mechanism 4. By pulling the heavier U-shaped frame 7 towards the center of the crossbeam 1, the lighter U-shaped frame 7 is pushed away from the center of the crossbeam 1, so that the two containers and the center are on the vertical line of the crossbeam 1. Ultimately, this ensures that even when the unloading speeds of the two containers are different, the entire device and the two containers remain in a horizontal state. The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A double-box synchronous hydraulic tilting spreader for a port crane, comprising a crossbeam (1), characterized in that: A suspended frame (2) is installed on the top of the crossbeam (1), and two symmetrically distributed U-shaped frames (7) are slidably installed below the crossbeam (1). The same pushing mechanism (4) is provided between the two U-shaped frames (7). Both the U-shaped frames (7) and the pushing mechanism (4) are slidably connected to the crossbeam (1) through two rolling mechanisms (5). Below each of the two U-shaped frames (7), there is a clamping mechanism (3) for fixing the container chassis. The two clamping mechanisms (3) rotate in opposite directions. The pushing mechanism (4) is used to push the two U-shaped frames (7) to move synchronously in opposite directions. An inclination sensor (6) for detecting the left and right tilt angles of the crossbeam (1) is embedded and fixedly installed at the top center of the crossbeam (1). A hydraulic cylinder (8) for pushing the pushing mechanism (4) to move left and right is fixedly installed on the top of the crossbeam (1). The hydraulic cylinder (8) is used to push the pushing mechanism (4) to make the two U-shaped frames (7) move synchronously in the same direction.

2. The double-box synchronous hydraulic tilting spreader for a port crane according to claim 1, characterized in that: The clamping mechanism (3) includes a hinge seat (31) fixed at the bottom of the U-shaped frame (7) and a flipping frame (33) set below the hinge seat (31). A hinge seat (32) is fixedly installed on the top of the flipping frame (33). The hinge seat (31) and the hinge seat (32) are rotatably connected. The flipping frame (33) is hinged to both sides of the U-shaped frame (7) through two hydraulic cylinders (38). Side frames (34) are fixedly installed on both sides of the flipping frame (33). Side plates (35) are fixedly installed at the ends of the two side frames (34) that are far apart from each other.

3. The double-box synchronous hydraulic tilting spreader for a port crane according to claim 2, characterized in that: The side plate (35) is provided with two rotary locks (36).

4. A double-box synchronous hydraulic tilting spreader for a port crane according to claim 2, characterized in that: Two door opening and closing devices (37) are fixedly installed on the rotary lock (36) away from the hinge seat (32).

5. A double-box synchronous hydraulic tilting spreader for a port crane according to claim 1, characterized in that: The pushing mechanism (4) includes a U-shaped frame two (41) that is slidably sleeved on the crossbeam (1). The rolling mechanism (5) located in the pushing mechanism (4) is fixedly connected to the inner wall of the U-shaped frame two (41). Two hydraulic cylinders three (42) are fixedly installed on both sides of the U-shaped frame two (41). The two hydraulic cylinders three (42) on the same side are mirror images of each other. The piston rod ends of the two hydraulic cylinders three (42) on the same side are respectively hinged to the corresponding U-shaped frame one (7).

6. A double-box synchronous hydraulic tilting spreader for a port crane according to claim 5, characterized in that: A horizontal plate (43) is fixedly installed on the top of the second purlin (41). The second purlin (41) is located above the crossbeam (1). The piston rod end of the first oil cylinder (8) is hinged to the top center of the horizontal plate (43).

7. A double-box synchronous hydraulic tilting spreader for a port crane according to claim 1, characterized in that: The rolling mechanism (5) includes a U-shaped wheel frame (51), on which horizontally arranged load-bearing wheels (53) are rotatably installed on both sides of the inner wall of the U-shaped wheel frame (51), and channel steel rails (11) are fixedly installed on both sides of the crossbeam (1). The two load-bearing wheels (53) on the rolling mechanism (5) are respectively rolled in the corresponding channel steel rails (11).

8. A double-box synchronous hydraulic tilting spreader for a port crane according to claim 7, characterized in that: On both sides of the inner wall of the U-shaped wheel frame (51), two longitudinally arranged limit wheels (52) are rotatably installed. Two load-bearing wheels (53) are respectively located between the two corresponding limit wheels (52). The limit wheels (52) abut against the side wall of the channel steel rail (11).

9. A double-box synchronous hydraulic tilting spreader for a port crane according to claim 1, characterized in that: An installation box (12) is embedded and fixedly installed at the top center of the crossbeam (1). The top of the installation box (12) is open. The tilt sensor (6) is fixedly installed inside the installation box (12). The top of the installation box (12) is detachably covered.

10. A double-box synchronous hydraulic tilting spreader for a port crane according to claim 1, characterized in that: The suspended frame (2) includes a rectangular frame (21) fixedly installed on the top of the crossbeam (1). The top of the rectangular frame (21) is provided with a plurality of pulleys (22) arranged in a rectangular shape, and a sling (23) is wound around the pulleys (22).

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