Automatic deceleration device for bridge crane

Abstract

The present invention relates to the technical field related to bridge cranes, in particular, an automatic deceleration device for bridge cranes, comprising a bridge crane frame and a slide that slides horizontally in the bridge crane frame, wherein a first rotating shaft is rotatably provided in the slide, a lifting rope is wound around the first rotating shaft, and one end of the lifting rope extends downward through the slide for connection to a sling. The present invention can lift and transfer containers through the cooperation of a power group and a sling, and can monitor the sliding speed of the lifting rope through the provision of a speed sensor. When the sliding speed exceeds a normal value, the locking mechanism is activated to slide the second block out to block the first block, thereby achieving the purpose of limiting the first rotating shaft and preventing the lifting rope from continuing to slide rapidly. It can achieve the purpose of providing an overall emergency protection for the lifting structure after the motor fails, and can also achieve the purpose of protecting personnel and cargo within the range of the bridge crane.

Description

Technical Field

[0001] The present invention relates to the technical field related to bridge cranes, and in particular, to an automatic deceleration device for bridge cranes. Background Art

[0002] A gantry crane is a type of crane used for loading and unloading operations at docks. It is the heart of a dock. The operating capacity of a gantry crane determines the cargo throughput capacity of a dock. Today's gantry cranes have gradually shifted from on-site operations to remote control, which has optimized the working environment and improved operating efficiency.

[0003] When lifting containers, existing bridge cranes need to transfer the containers from the cargo ship to the trucks on the shore. During the entire transfer process, the area under the bridge crane and where the trucks are parked is in a relatively dangerous area. When the lifting system fails due to engine failure and there are no emergency measures, the container will fall rapidly, causing damage to people and cargo. Therefore, an automatic deceleration device is needed to provide emergency protection for the lifting system after the engine fails. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to solve the problem that the existing bridge crane is prone to cause damage to personnel and cargo due to motor failure during the process of lifting containers.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] The cam is secured to the chassis and has a first end secured thereto and a second end secured thereto for securing the chassis to a position adjacent to the chassis in the forward direction.

[0007] Compared with the existing technology, the advantages of the present invention are: the container can be lifted and transferred through the cooperation of the power group and the sling, and the sliding speed of the lifting rope can be monitored by the setting of the speed sensor. When the sliding speed exceeds the normal value, the locking mechanism is activated to make the second block slide out to block the first block, thereby achieving the limitation of the first rotating shaft and preventing the lifting rope from continuing to slide down rapidly. It can achieve the purpose of providing an overall emergency protection for the lifting structure after the motor fails, and can also achieve the purpose of protecting people and goods within the range of the bridge crane.

[0008] Preferably, a buffer rack is provided on the lower side of the slide seat, a plurality of sleeves are provided in the buffer rack, the speed sensor is provided in the sleeve, the suspension rope is slidably provided in the sleeve, and the plurality of suspension ropes correspond to the plurality of sleeves in a one-to-one manner.

[0009] Preferably, a threaded shaft is provided at the bottom of the slide, the buffer frame is threadedly connected to the threaded shaft, the upper end of the threaded shaft is provided with a first motor for driving the threaded shaft to rotate, and a plurality of limiting columns are also provided at the bottom of the slide, and the buffer frame is slid up and down on the outer periphery of the limiting columns.

[0010] Preferably, the driving member includes a second rotating shaft and a second motor for driving the second rotating shaft to rotate, the second rotating shaft is provided with a driving gear, and driven gears are respectively engaged with both sides of the driving gear, and the driven gears are provided on the first rotating shaft.

[0011] Preferably, an installation chamber with an open upper side is provided in the slide seat, the second motor is provided on the bottom wall of the installation chamber, and the first rotating shaft is rotatably provided on the side wall of the installation chamber.

[0012] Preferably, a telescopic cylinder is provided on the bottom wall of the installation chamber for driving the second stopper to slide horizontally on the bottom wall of the installation chamber.

[0013] Preferably, a limiting groove for limiting the second stopper in a direction perpendicular to the sliding direction is provided on a side wall of the installation chamber close to the second stopper along the sliding direction of the second stopper.

[0014] Preferably, a cover plate is provided on the upper side of the installation chamber, and a handle is provided on the cover plate.

[0015] Preferably, two rope racks are provided on the first rotating shaft, and the upper part of the suspension rope is wound around the rope racks. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall schematic diagram of the present invention.

[0017] Figure 2 for Figure 1 Schematic diagram of the lifting structure.

[0018] Figure 3 for Figure 2 Schematic diagram of the structure of AA.

[0019] Figure 4 for Figure 3 Schematic diagram of the structure of BB.

[0020] Figure 5 for Figure 4 Schematic diagram of the CC structure.

[0021] Reference numerals: 1, bridge crane frame; 11, main beam; 12, control unit;

[0022] 2. Lifting structure; 21. Slide; 211. Installation chamber; 212. Limiting slot; 22. Cover plate; 221. Handle; 23. Second motor; 231. Second rotating shaft; 232. Driving gear; 24. Rope holder; 241. Lifting rope; 242. First rotating shaft; 2421. First stopper; 25. Driven gear; 26. Telescopic cylinder; 27. Second stopper;

[0023] 3. Buffer rack; 31. Sleeve; 311. Speed ​​sensor; 32. Threaded shaft; 321. First motor; 33. Limiting column;

[0024] 4. Spreader. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] This embodiment provides an automatic deceleration device for a bridge crane, which is mainly used to solve the problem that in the process of lifting containers, motor failure of the existing bridge crane may easily cause damage to personnel and cargo.

[0027] Reference Figure 1As shown, in the bridge crane, the lifting device can slide up and down through the lifting structure 2 to lift and transfer the container, wherein the lifting structure 2 includes an internal power group and a lifting device 4 for lifting the container. When the bridge crane lifts and transfers the container on the cargo ship, it mainly performs a horizontal sliding of the lifting structure 2 in the bridge crane main beam 11, and realizes a cargo transfer of the container by lifting and lowering in the lifting structure 2. During the transfer process, the container is always in a suspended state and needs to be transferred to the truck waiting on the shore. Most fully loaded containers weigh dozens of tons. When the motor in the lifting structure 2 fails, the gravity of the container itself will cause the entire lifting structure 2 and the container to fall rapidly, which is easy to cause damage to the cargo and personnel. In order to solve the above problems, this embodiment includes a bridge crane frame 1 and a slide 21 horizontally slidingly arranged in the bridge crane frame 1, characterized in that a first rotating shaft 242 is rotatably provided in the slide 21, and a lifting rope 241 is wound around the first rotating shaft 242. One end of the rope 241 extends downward through the slide 21 for connection to the sling 4. A driving member for driving the first rotating shaft 242 to rotate is provided on one side of the first rotating shaft 242, and a locking mechanism is also provided in the slide 21; the container can be lifted by the lifting structure 2. Specifically, the driving member operates to rotate the first rotating shaft 242, thereby causing the sling 4 to continuously approach the container until the buckles in the sling 4 are locked into the four corners of the container. At this time, the driving member operates in the opposite direction to cause the lifting rope 241 to slide upward, thereby starting to lift the container in the cargo ship. After lifting to a certain height, the lifting structure 2 slides horizontally in the main beam 11 of the bridge crane until it moves above the truck on the shore. At this time, the driving member operates to cause the lifting rope 241 to slide downward and extend to achieve the purpose of placing the container on the truck. During the transfer process, if the lifting rope 241 slides down rapidly due to the importance of the container due to motor failure, the locking mechanism starts to operate, which can limit the lifting structure 2 and prevent the container from falling rapidly and causing damage to the cargo and personnel.

[0028] It should be noted that the main beam 11 of the bridge crane is horizontally arranged inside the bridge crane, mainly used to ensure the horizontal sliding of the entire lifting structure 2, and there are multiple lifting ropes to ensure the stability of the container lifting.

[0029] It should also be noted that the bridge crane mentioned in this embodiment is a remote-controlled bridge crane, and the position of the cockpit will not be affected by the setting of the slide 21.

[0030] Reference Figure 2 and Figure 3As shown, the specific structure of the locking mechanism in the above-mentioned embodiment is as follows: the locking mechanism includes a first stopper 2421 provided on the first rotating shaft 242, the first stopper 2421 is symmetrically arranged on both sides of the first rotating shaft 242 as the symmetrical center, and the first stopper 2421 is fan-shaped and rotates synchronously with the first rotating shaft 242, and a second stopper 27 is horizontally slidably provided on the bottom wall of the slide 21; when the emergency measure is activated, the locking mechanism starts to operate, and the second stopper 27 slides on the bottom wall of the slide 21 to the bottom of the first stopper 2421. At this time, the first stopper 2421 still rotates at a high speed with the first rotating shaft 242. When the second stopper 27 is stuck under the first stopper 2421, the first stopper 2421 will abut against the second stopper 27. At this time, the first rotating shaft 242 stops rotating, and the first rotating shaft 242 stops rotating after the motor fails. At this time, the first rotating shaft 242 stops rotating, and the lifting rope 241 will not continue to slide downward, thereby limiting the container and protecting the safety of people and goods.

[0031] The first stop block 2421 mentioned above is fan-shaped, and the specific setting relative to the center of the first rotating shaft 242 refers to the presence of a through area between the two side edges of the first stop block 2421, just like a fan blade. This setting is to ensure that the second stop block 27 can slide to the bottom of the first stop block 2421.

[0032] It is worth mentioning that how to start the emergency measures as soon as the motor fails, that is, how to start the locking mechanism, is achieved in this embodiment by monitoring the sliding speed of the suspension rope 241. Specifically, the suspension rope 241 is provided with a speed sensor 311 for triggering the locking mechanism under the slide 21; the speed sensor 311 can monitor the sliding speed of the suspension rope 241. When the sliding speed of the suspension rope 241 exceeds the normal level, the locking mechanism will be triggered.

[0033] It should be noted that the above monitoring of the speed of the sling rope 241 sliding down refers to the linear speed of the sling rope 241 sliding down.

[0034] Reference Figures 2 to 5As shown, in order to ensure that the speed sensor 311 is more accurate in monitoring the sliding speed of the lifting rope 241, in this embodiment, a buffer frame 3 is provided on the lower side of the slide 21, and a plurality of sleeves 31 are provided in the buffer frame 3, the speed sensor 311 is provided in the sleeve 31, the lifting rope 241 is slidably provided in the sleeve 31, and the plurality of lifting ropes 241 correspond to the plurality of sleeves 31 one by one; the setting of the buffer frame 3 and the sleeve 31 can achieve the purpose of positioning and protecting the speed sensor 311, and the setting of the buffer frame 3 can also play another role: buffering the swing of the lifting rope 241. Since the lifting structure 2 and the sling 4 are connected by the lifting rope 241, and the connection distance is relatively long, when the sling 4 is in a suspended state, the influence of factors such as nearby wind force will cause the sling 4 to swing, and this swing will be further increased because the lifting rope 241 is too long. In this embodiment, the buffer frame 3 is provided to achieve the purpose of providing a preliminary buffer for the lifting rope 241.

[0035] It is worth mentioning that the above-mentioned buffer frame 3 can be adjusted in a vertical direction. Specifically, a threaded shaft 32 is provided at the bottom of the slide 21, and the buffer frame 3 is threadedly connected to the threaded shaft 32. The upper end of the threaded shaft 32 is provided with a first motor 321 for driving the threaded shaft 32 to rotate; when the first motor 321 starts to run and drives the threaded shaft 32 to rotate, the buffer frame 3 slides up and down with the rotation of the threaded shaft 32, and then the position of the buffer frame 3 can be adjusted, and the swing of the lifting rope 241 and the swing of the sling 4 can be buffered and adjusted accordingly; further, the setting of the above-mentioned buffer frame 3 can be regarded as solving the problem that the lifting rope 241 is prone to swinging due to its excessive length. The buffer frame 3 is used to segment the lifting rope 241, so that the distance between the restricted position of the lifting rope 241 and the sling 4 is shortened, which will also reduce the swing of the lifting rope 241, thereby facilitating the subsequent loading and lifting of the container by the sling 4.

[0036] It should be noted that in order to ensure that the buffer frame 3 can slide vertically up and down as the threaded shaft 32 rotates, in this embodiment, a limit column 33 is provided in the buffer frame 3 for sliding up and down, and the upper end of the limit column 33 is provided at the bottom of the slide 21; the setting of the limit column 33 can ensure the circumferential limitation of the buffer frame 3.

[0037] Reference Figure 2 and Figure 4As shown, the specific structure of the driving member mentioned above is as follows: the driving member includes a second rotating shaft 231 and a second motor 23 for driving the second rotating shaft 231 to rotate, a driving gear 232 is provided on the second rotating shaft 231, and driven gears 25 are respectively engaged on both sides of the driving gear 232, and the driven gears 25 are provided on the first rotating shaft 242; the operation of the second motor 23 is used to rotate the second rotating shaft 231, thereby driving the driving gear 232 to rotate, thereby achieving the purpose of rotating the driven gears 25 on both sides, thereby achieving the purpose of causing the first rotating shaft 242 to start rotating, and thereby causing the rope 241 wrapped around the first rotating shaft 242 to start extending or contracting.

[0038] It should be noted that the specific transmission ratio between the driving gear 232 and the driven gear 25 can be determined according to actual conditions. The connection between the gears can be used to match the rotational speed and transmit torque.

[0039] It should also be noted that, in this embodiment, two first rotating shafts 242 are provided, one on each side of the second rotating shaft 231. However, due to the meshing relationship between the driven gear 25 and the driving gear 232, the two driven gears 25 mean opposite directions. This arrangement will cause the ropes 241 on the two first rotating shafts 242 to be unable to extend or retract synchronously. In order to solve this type of problem, in this embodiment, two rope racks 24 are provided on the first rotating shaft 242, and the upper parts of the ropes 241 are wound on the rope racks 24; the arrangement of the rope racks 24 can ensure that the ropes 241 are wound in the rope racks 24, while playing a role of limiting protection and changing the direction of the ropes 241 wound in the rope racks 24 to the opposite direction. In this arrangement, when the two first rotating shafts 242 rotate in opposite directions, the ropes 241 are all in a state of synchronous extension or retraction, which ensures that the lifting structure 2 can slide the sling 4 in the vertical direction.

[0040] Reference Figures 2 to 5 As shown, in order to ensure that the entire lifting structure 2 can be in a relatively stable environment, in this embodiment, an installation chamber 211 with an open upper side is opened in the slide 21, the second motor 23 is arranged on the bottom wall of the installation chamber 211, and the first rotating shaft 242 is rotatably arranged on the side wall of the installation chamber 211; through the setting of the installation chamber 211, the purpose of setting the entire lifting structure 2 therein is achieved, which can effectively protect it and ensure its stability.

[0041] In addition, the sliding of the second stop block 27 in the above-mentioned locking mechanism is also achieved by the telescopic cylinder 26 arranged on the bottom wall of the installation chamber 211. The operation of the telescopic cylinder 26 achieves the purpose of quickly pushing the second stop block 27 to slide; the process of the telescopic cylinder 26 receiving instructions and operating here is specifically as follows: a control unit 12 is provided on the bridge crane, and when the speed sensor 311 transmits information to the control unit 12, and through analysis and processing by the control unit 12, when it is obtained that the descent speed of the lifting rope 241 is too fast, the control unit 12 sends an instruction to the telescopic cylinder 26, and the telescopic cylinder 26 starts to run, which also causes the locking mechanism to start to be triggered.

[0042] It is worth mentioning that after the second stop block 27 slides to the bottom of the first stop block 2421, the first stop block 2421 will rotate with the first rotating shaft 242, and the existence of the second stop block 27 will make the first stop block 2421 abut against the second stop block 27. At this time, the first stop block 2421 cannot continue to rotate, thereby achieving the purpose of limiting the continued rotation of the first rotating shaft 242, thereby ensuring that the lifting rope 241 and the sling 4 and the container lifted by the sling 4 will not continue to fall downward, thereby achieving the purpose of emergency braking.

[0043] It should be noted that in order to ensure that the second stop block 27 does not shift, in this embodiment, a limiting groove 212 is provided on the side wall of the installation chamber 211 close to the second stop block 27 along the sliding direction of the second stop block 27 for limiting the second stop block 27 in a direction perpendicular to the sliding direction; through the setting of the limiting groove 212, the second stop block 27 sliding into the limiting groove 212 can be limited in all directions, ensuring that the second stop block 27 will not shift due to the push of the first stop block 2421.

[0044] In addition, in order to facilitate regular inspection and maintenance of the parts in the installation chamber 211, the upper side of the installation chamber 211 is open, and a cover plate 22 is detachably connected to the upper side. The installation chamber 211 can be opened through the cover plate 22 to facilitate maintenance and other operations. At the same time, a handle 221 is provided on the cover plate 22 to facilitate the removal of the cover plate 22.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A bridge crane automatic deceleration device, comprising a bridge crane frame (1) and a slide seat (21) horizontally slidingly arranged in the bridge crane frame (1), characterized in that: A first rotating shaft (242) is provided for rotation in the slide (21), a sling (241) is wound around the first rotating shaft (242), one end of the sling (241) extends downward through the slide (21) for connection to the sling (4), a driving member for driving the first rotating shaft (242) to rotate is provided on one side of the first rotating shaft (242), and a locking mechanism is also provided in the slide (21), the locking mechanism includes a first stopper (2421) provided on the first rotating shaft (242), the first stopper (2421) is symmetrically arranged on both sides with the first rotating shaft (242) as the symmetry center, and the first stopper (2421) is fan-shaped and rotates synchronously with the first rotating shaft (242). A second stopper (27) is provided on the bottom wall of the slide (21) for horizontal sliding. The sliding of the second stopper (27) causes the first stopper (2421) to produce two states. In the first state, the second stopper (27) does not slide and is located on one side of the first stopper (2421). At this time, the first stopper (2421) is not affected by the second stopper (27) and rotates synchronously with the first rotating shaft (242). In the second state, the second stopper (27) slides to the bottom of the first stopper (2421). At this time, the rotation of the first stopper (2421) is blocked by the second stopper (27). A speed sensor (311) for monitoring the descending speed of the suspension rope (241) is provided at the bottom of the slide (21). A buffer frame (3) is provided on the lower side of the slide seat (21), a plurality of sleeves (31) are provided in the buffer frame (3), the speed sensor (311) is provided in the sleeve (31), the suspension rope (241) is slidably provided in the sleeve (31), and the plurality of suspension ropes (241) correspond to the plurality of sleeves (31) in a one-to-one manner; A threaded shaft (32) is provided at the bottom of the slide (21), the buffer frame (3) is threadedly connected to the threaded shaft (32), the upper end of the threaded shaft (32) is provided with a first motor (321) for driving the threaded shaft (32) to rotate, and a plurality of limiting columns (33) are also provided at the bottom of the slide (21), and the buffer frame (3) is slidably arranged on the outer periphery of the limiting columns (33).

2. The automatic deceleration device for a bridge crane according to claim 1, characterized in that: The driving member comprises a second rotating shaft (231) and a second motor (23) for driving the second rotating shaft (231) to rotate. A driving gear (232) is provided on the second rotating shaft (231). Driven gears (25) are respectively meshed on both sides of the driving gear (232). The driven gears (25) are provided on the first rotating shaft (242).

3. The automatic deceleration device for a bridge crane according to claim 2, characterized in that: The slide seat (21) is provided with an installation chamber (211) with an open upper side, the second motor (23) is arranged on the bottom wall of the installation chamber (211), and the first rotating shaft (242) is rotatably arranged on the side wall of the installation chamber (211).

4. The automatic deceleration device for a bridge crane according to claim 3, characterized in that: A telescopic cylinder (26) is provided on the bottom wall of the installation chamber (211) for driving the second stopper (27) to slide horizontally on the bottom wall of the installation chamber (211).

5. The automatic deceleration device for a bridge crane according to claim 4, characterized in that: A limiting groove (212) for limiting the second stopper (27) in a direction perpendicular to the sliding direction is provided on a side wall of the installation chamber (211) close to the second stopper (27) along the sliding direction of the second stopper (27).

6. The automatic deceleration device for a bridge crane according to claim 3, characterized in that: A cover plate (22) is provided on the upper side of the installation chamber (211), and a handle (221) is provided on the cover plate (22).

7. The automatic deceleration device for a bridge crane according to claim 1, characterized in that: Two rope racks (24) are provided on the first rotating shaft (242), and the upper part of the suspension rope (241) is wound around the rope racks (24).

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