Method for transferring a rail-mounted crane

Abstract

The present application relates to the crane technology field, disclose a kind of transfer method of rail-mounted crane, beam tooling is installed below crane, beam tooling is installed below wooden pier assembly;Self-propelled module transport vehicle group drives to the preset position below crane, pre-tightening force is applied to wooden pier assembly;Synchronous jacking, when the load value of any beam module vehicle is monitored and is lower than preset value, determine that the beam module vehicle is virtual leg, and leveling is carried out;When the jacking height difference of both sides of crane is greater than preset value, the hydraulic pressure of each beam module vehicle is adjusted, so that both sides of crane restore level and then continue to walk;When detecting that one side of self-propelled module transport vehicle group loses pressure, trigger the buffer pad layer between crane walking wheel and ground to be unfolded, and the other side is relieved pressure.The present application can eliminate virtual leg, realize uniform load, avoid stress concentration, monitor jacking height difference in real time and adjust in time to improve transfer safety, and buffer pad layer can avoid walking wheel directly contacting ground.

Description

Technical Field

[0001] This invention relates to the field of crane technology, and in particular to a method for transporting a rail-mounted crane. Background Technology

[0002] In the port, shipbuilding, and marine engineering sectors, large rail-mounted cranes (such as gantry cranes, quay cranes, and telescopic cranes) often require transport as a whole due to changes in operational needs or site relocation. Traditional transportation methods mainly employ large flatbed trucks or rail traction. For example, Chinese Patent CN109823252B discloses a crane transfer method that uses a hydraulic flatbed truck to directly lift the crane via a transfer beam. However, the support surface cannot fully fit the lower crossbeam of the crane, easily leading to areas where the lower crossbeam cannot be effectively supported, causing localized stress concentration. Furthermore, it does not consider emergency handling operations under extreme conditions (such as pressure loss). Similarly, self-propelled modular transporters (SPMTs) also directly lift the lower crossbeam of the crane, resulting in the same problem of localized stress concentration. However, for cranes that are large in size, have a high center of gravity, and uneven weight distribution, traditional methods suffer from poor transportation stability, high site requirements, and low operational efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a transfer method for a rail-mounted crane that can eliminate the false legs, achieve uniform load-bearing of multiple sets of crossbeam modules, avoid stress concentration, monitor the lifting height difference in real time and adjust it in a timely manner to improve transfer safety, and under extreme working conditions, the buffer pad can prevent the traveling wheels from directly contacting the ground, effectively protecting the traveling wheels.

[0004] To achieve the above objectives, the present invention provides a method for transferring a rail-mounted crane, comprising the following steps: Step 1: Install the crossbeam fixture under the crane, and install the wooden block assembly under the crossbeam fixture; prepare the self-propelled modular transport vehicle group according to the crane specifications; wherein, the self-propelled modular transport vehicle group includes multiple crossbeam modular vehicles and connecting modular vehicles for connecting two adjacent crossbeam modular vehicles. Step 2: The self-propelled modular transport vehicle group travels to the preset position under the crane and adjusts the height of the bearing platform of each crossbeam module vehicle to apply pre-tightening force to the wooden block assembly; Step 3: The load-bearing platforms of all crossbeam module vehicles are lifted synchronously, and the load value of each crossbeam module vehicle is monitored in real time. When the load value of any crossbeam module vehicle is found to be lower than the preset value, the crossbeam module vehicle is determined to be a virtual leg module vehicle. The load-bearing platform of the self-propelled module transport vehicle group is leveled so that the load values ​​of all crossbeam module vehicles are within the preset value. Step 4: During the transfer process, when the difference in lifting height between the left and right sides of the crane exceeds the preset value, the self-propelled modular transport vehicle group stops moving, adjusts the hydraulic pressure of each crossbeam module vehicle, and restores the left and right sides of the crane to level before continuing to move; when a loss of pressure is detected on one side of the self-propelled modular transport vehicle group, the buffer pad between the crane's traveling wheels and the ground is triggered to unfold, and the other side of the self-propelled modular transport vehicle group is depressurized, allowing the crane's traveling wheels to land and support the ground. After troubleshooting, step 3 is executed again.

[0005] As a preferred embodiment of the present invention, in step 1, the boom of the crane is laid flat and rotated to a direction parallel to the crane's travel track; in step 2, the length direction of the self-propelled modular transport vehicle is parallel to the crane's travel track.

[0006] As a preferred embodiment of the present invention, in step 1, the crossbeam fixture is provided in two sets and is respectively located on the front and rear traveling wheels of the crane. Each crossbeam fixture is supported by two sets of crossbeam module vehicles arranged on the left and right.

[0007] As a preferred embodiment of the present invention, in step 3, during leveling, the lifting height of the crossbeam module vehicle, which is diagonally opposite to the virtual leg module vehicle, is reduced.

[0008] As a preferred embodiment of the present invention, in step 3, when the load value of one of the crossbeam module vehicles is detected to be lower than 80% of the theoretical load value, the crossbeam module vehicle is determined to be a virtual leg module vehicle.

[0009] As a preferred embodiment of the present invention, in step 3, the lifting height increment of the load-bearing platform of the crossbeam module vehicle is 5mm-10mm each time, and the interval between each lifting action of the load-bearing platform of the crossbeam module vehicle is 2-3 seconds.

[0010] As a preferred embodiment of the present invention, in step 3, the total lifting height of the crossbeam module vehicle does not exceed 100mm; in step 4, when the lifting height difference between the left and right sides of the crane is greater than 50mm, the self-propelled module transport vehicle group stops moving and adjusts the hydraulic pressure of each crossbeam module vehicle.

[0011] As a preferred embodiment of the present invention, in step 4, the compression amount of each wooden block component is monitored in real time, and when the compression amount of any wooden block component exceeds 15% of the initial thickness, the wooden block component is replaced.

[0012] As a preferred embodiment of the present invention, in step 4, the difference in lifting height between the left and right sides of the crane is monitored by displacement sensors on the self-propelled modular transport vehicle group, and the pressure difference between the left and right sides of the self-propelled modular transport vehicle group is monitored in real time to help determine the difference in lifting height between the left and right sides of the crane.

[0013] As a preferred embodiment of the present invention, in step 1, each of the crossbeam fixtures includes a square main beam and triangular reinforcing structures disposed on the front and rear sides of the square main beam. The bottom of the crane is fixedly connected to the square main beam through a mounting plate and a triangular elbow plate. The interior of the square main beam is provided with longitudinal stiffening ribs and transverse partitions.

[0014] The advantages of the rail-mounted crane transfer method of this invention compared with the prior art are as follows: This invention incorporates a wooden block assembly between the crossbeam tooling and the crossbeam module vehicle. This assembly evenly distributes the load, avoids stress concentration, and acts as a buffer and shock absorber during transport, effectively protecting the crane. It also levels the load-bearing platform of the self-propelled modular transport vehicle group, eliminating modules with loose legs and achieving uniform load distribution across multiple crossbeam module vehicles. During transport, real-time monitoring and adjustment of the lifting height difference enhances transport safety. In extreme conditions such as module vehicle depressurization, the buffer layer prevents the wheels from directly contacting the ground, transforming a hard landing into a soft landing and effectively protecting the wheels. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0016] Figure 1 A schematic diagram of the overall structure between the crane (hidden traveling wheels), the crossbeam fixture, and the self-propelled modular transport vehicle provided by the present invention; Figure 2 A top view showing the interaction between the beam tooling provided by this invention and the self-propelled modular transport vehicle assembly; Figure 3 This is a schematic diagram of the structure of the wooden block assembly and the displacement scale provided by the present invention. Figure 4 A diagram showing the maximum tilt of the gantry crane when it is placed on the ground on the left and right sides, as provided by this invention. In the diagram, there are crane 1, rail 11, crossbeam fixture 2, square main beam 21, triangular reinforcing structure 22, wooden block assembly 3, self-propelled modular transport vehicle 4, crossbeam module vehicle 41, connecting module vehicle 42, and displacement scale 5. Detailed Implementation

[0017] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0018] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", 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 invention 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 invention.

[0019] like Figures 1 to 4 As shown, a preferred embodiment of the present invention provides a method for transferring a rail-mounted crane, comprising the following steps: Step 1: Install the crossbeam fixture 2 below the crane 1 (large rail-mounted crane 1), and install the wooden block assembly 3 below the crossbeam fixture 2; prepare the self-propelled modular transport vehicle group 4 according to the specifications of the crane 1; wherein, the self-propelled modular transport vehicle group 4 includes multiple crossbeam module vehicles 41 and a connecting module vehicle 42 for connecting two adjacent crossbeam module vehicles 41. Step 2: The self-propelled modular transport vehicle group 4 (SPMT) travels to the preset position under the crane 1, and adjusts the height of the bearing platform of each crossbeam module vehicle 41 to apply pre-tightening force to the wooden block assembly 3, eliminating the gap between the crossbeam module vehicle 41, the wooden block assembly 3, and the crossbeam tooling 2. Step 3: The load-bearing platforms of all crossbeam module vehicles 41 are simultaneously lifted, and the load value of each crossbeam module vehicle 41 is monitored in real time. When the load value of any crossbeam module vehicle 41 is found to be lower than the preset value, the crossbeam module vehicle 41 is determined to be a "virtual leg" module vehicle. The load-bearing platform of the self-propelled modular transport vehicle group 4 is then leveled to ensure that the load values ​​of all crossbeam module vehicles 41 are within the preset value. In this embodiment, when the load value of one crossbeam module vehicle 41 is found to be lower than 80% of the theoretical load value, the crossbeam module vehicle 41 is determined to be a "virtual leg" module vehicle to ensure that the load is safely distributed among the crossbeam module vehicles 41 and to avoid excessive local stress. Further, after the self-propelled modular transport vehicle group 4 reaches the predetermined lifting height (in this embodiment, the traveling wheels of the crane 1 are about 50mm away from the track 11), the lifting is stopped and the vehicle is left to stand still for 35 minutes. During the standing period, the bending deformation of the crossbeam workpiece, the compression of the wooden block component 3, and the load distribution of the crossbeam module vehicle 41 are checked and recorded. After confirming that there are no abnormalities, the process proceeds to step 4 to transfer the crane 1. Step 4: During the transfer process, when the height difference between the left and right sides of crane 1 exceeds the preset value, the self-propelled modular transport vehicle group 4 stops moving, adjusts the hydraulic pressure of each crossbeam module 41 to restore the left and right sides of crane 1 to level, and then continues moving. When a loss of pressure is detected on one side of the self-propelled modular transport vehicle group 4 (i.e., the hydraulic pressure of the crossbeam module 41 drops sharply to near zero), the buffer pad layer (not shown in the figure) between the traveling wheels of crane 1 and the ground is triggered to unfold, and the other side of the self-propelled modular transport vehicle group 4 is depressurized, allowing the traveling wheels of crane 1 to land and be supported. After troubleshooting, step 3 is repeated. The buffer pad layer can be made of rubber pads or sandboxes, and the buffer pad layer must be laid before the traveling wheels land. After crane 1 is transferred to the target anchor point, the hydraulic suspension system of each crossbeam module 41 is lowered simultaneously to smoothly unload crane 1 onto the preset track 11 or foundation. The temporary structures such as the crossbeam tooling 2 (square main beam 21, triangular reinforcing structure 22, stack plate and triangular elbow plate) and the wooden block assembly 3 are removed.

[0020] This invention incorporates a wooden block assembly 3 between the crossbeam fixture 2 and the crossbeam module vehicle 41. This assembly distributes the load evenly, prevents stress concentration, and acts as a buffer and shock absorber during transport, effectively protecting the crane 1. It also levels the load-bearing platform of the self-propelled modular transport vehicle group 4, eliminating the "empty leg" module vehicle and ensuring uniform load distribution across multiple crossbeam module vehicles 41. During transport, real-time monitoring and timely adjustments based on the lifting height difference enhance transport safety. In extreme conditions such as module vehicle depressurization, the buffer layer prevents the wheels from directly contacting the ground, transforming a hard landing into a soft landing and effectively protecting the wheels.

[0021] For example, in step 1, the boom of the crane 1 is laid flat and rotated to a direction parallel to the travel track 11 of the crane 1, the center of gravity of the crane 1 is adjusted and lowered, and in step 2, the length direction of the self-propelled modular transport vehicle group 4 is parallel to the travel track 11 of the crane 1, and the boom is rotated to be parallel to the direction of the track 11, so that the boom is evenly distributed on the longitudinal axis of the self-propelled modular transport vehicle group 4, which greatly reduces the risk of rollover caused by the shift of the center of gravity and improves the stability of the transfer process.

[0022] Specifically, in step 1, the crossbeam fixture 2 is provided with two sets, which are respectively located on the front and rear travel wheel sets of the crane 1. Each crossbeam fixture 2 is supported by two sets of crossbeam module carts 41 arranged on the left and right. In this embodiment, it is supported by four sets of crossbeam module carts 41, which evenly support the crane 1 at four points.

[0023] For example, in step 3, during leveling, the lifting height of the crossbeam module 41, which is diagonally opposite to the virtual leg module 41, is reduced. Adaptive leveling is performed based on three-point plane positioning to eliminate the virtual leg module 41, ensuring that all crossbeam module 41 can be synchronously and effectively supported, thereby achieving uniform load bearing of the crane 1 and avoiding uneven load distribution.

[0024] Furthermore, in step 3, the lifting height increment of the load-bearing platform of the crossbeam module vehicle 41 is 5mm-10mm each time to avoid mechanical impact and structural overload caused by excessive single stroke. The load-bearing platform of the crossbeam module vehicle 41 pauses for 2-3 seconds between each lifting action to promptly detect abnormal situations and effectively correct any minor asynchrony that may occur during each lifting, ensuring that the self-propelled modular transport vehicle group 4 lifts the crane 1 synchronously and improving the stability of the lifting.

[0025] In this embodiment, in step 3, the total lifting height of the crossbeam module vehicle 41 does not exceed 100mm. Under the preset limit of the maximum lifting height of 100mm, the crane 1 reaches the maximum tilt angle (0.6°), and the center of gravity shifts to the left or right by about 271mm, which meets the stability requirements. In step 4, when the lifting height difference between the left and right sides of the crane 1 is greater than 50mm, the self-propelled module transport vehicle group 4 stops moving and adjusts the hydraulic pressure of each crossbeam module vehicle 41 to provide safety during the transfer process.

[0026] For example, in step 4, the compression of each wooden block component 3 is monitored in real time. When the compression of any wooden block component 3 exceeds 15% of the initial thickness, the wooden block component 3 is replaced. Specifically, a displacement scale 5 or strain gauge is set on the side of the wooden block component 3 to monitor the compression of each wooden block component 3 in real time, prompting the operator to replace the wooden block component 3 at the next stopping point to prevent the wooden block component 3 from being crushed and causing load impact.

[0027] For example, in step 4, the displacement sensor on the self-propelled modular transport vehicle group 4 monitors the lifting height difference between the left and right sides of the crane 1, and at the same time, the pressure difference between the left and right sides of the self-propelled modular transport vehicle group 4 is monitored in real time to help determine the lifting height difference between the left and right sides of the crane 1, thereby improving the accuracy of the lifting height difference detection.

[0028] Specifically, such as Figures 1 to 3As shown, in step 1, each of the crossbeam fixtures 2 includes a square main beam 21 and triangular reinforcing structures 22 arranged on the front and rear sides of the square main beam 21 to improve the overall rigidity of the square main beam 21. Specifically, a wooden block assembly 3 is provided between the bottom of the triangular reinforcing structure 22 and the crossbeam module 41. The bottom of the crane 1 is fixedly connected to the square main beam 21 through a plate and a triangular elbow plate to improve the connection stability between the crane 1 and the square main beam 21. The interior of the square main beam 21 is provided with longitudinal stiffening ribs and transverse partitions to improve the bending resistance and shear resistance of the square main beam 21.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for transferring rail-mounted cranes, characterized in that, Includes the following steps: Step 1: Install the crossbeam fixture under the crane, and install the wooden block assembly under the crossbeam fixture; prepare the self-propelled modular transport vehicle group according to the crane specifications; wherein, the self-propelled modular transport vehicle group includes multiple crossbeam modular vehicles and connecting modular vehicles for connecting two adjacent crossbeam modular vehicles. Step 2: The self-propelled modular transport vehicle group travels to the preset position under the crane and adjusts the height of the bearing platform of each crossbeam module vehicle to apply pre-tightening force to the wooden block assembly; Step 3: The load-bearing platforms of all crossbeam module vehicles are lifted synchronously, and the load value of each crossbeam module vehicle is monitored in real time. When the load value of any crossbeam module vehicle is found to be lower than the preset value, the crossbeam module vehicle is determined to be a "virtual leg" module vehicle. The load-bearing platform of the self-propelled modular transport vehicle group is then leveled to ensure that the load values ​​of all crossbeam module vehicles are within the preset values. After the self-propelled modular transport vehicle group is lifted into place, it is left to stand for inspection. Step 4: During the transfer process, when the difference in lifting height between the left and right sides of the crane exceeds the preset value, the self-propelled modular transport vehicle group stops moving, adjusts the hydraulic pressure of each crossbeam module vehicle, and restores the left and right sides of the crane to level before continuing to move; when a loss of pressure is detected on one side of the self-propelled modular transport vehicle group, the buffer pad between the crane's traveling wheels and the ground is triggered to unfold, and the other side of the self-propelled modular transport vehicle group is depressurized, allowing the crane's traveling wheels to land and support the ground. After troubleshooting, step 3 is executed again.

2. The method for transferring a rail-mounted crane as described in claim 1, characterized in that, In step 1, the crane boom is leveled and rotated to a direction parallel to the crane's travel track; in step 2, the length direction of the self-propelled modular transport vehicle is parallel to the crane's travel track.

3. The method for transferring a rail-mounted crane as described in claim 1, characterized in that, In step 1, the crossbeam fixture is provided in two sets, which are respectively located on the front and rear traveling wheels of the crane. Each crossbeam fixture is supported by two sets of crossbeam module vehicles arranged on the left and right.

4. The method for transferring a rail-mounted crane as described in claim 3, characterized in that, In step 3, during leveling, the lifting height of the crossbeam module vehicle, which is diagonally opposite to the virtual leg module vehicle, is reduced.

5. The method for transferring a rail-mounted crane as described in claim 1, characterized in that, In step 3, when the load value of one of the crossbeam module vehicles is detected to be lower than 80% of the theoretical load value, the crossbeam module vehicle is determined to be a virtual leg module vehicle.

6. The method for transferring a rail-mounted crane as described in claim 1, characterized in that, In step 3, the lifting height of the crossbeam module vehicle's carrying platform increases by 5mm-10mm each time, and there is a pause of 2-3 seconds between each lifting action of the crossbeam module vehicle's carrying platform.

7. The method for transferring a rail-mounted crane as described in claim 1, characterized in that, In step 3, the total lifting height of the crossbeam module vehicle shall not exceed 100mm; in step 4, when the lifting height difference between the left and right sides of the crane is greater than 50mm, the self-propelled module transport vehicle group stops moving and the hydraulic pressure of each crossbeam module vehicle is adjusted.

8. The method for transferring a rail-mounted crane as described in claim 1, characterized in that, In step 4, the compression of each wooden block component is monitored in real time. When the compression of any wooden block component exceeds 15% of the initial thickness, the wooden block component is replaced.

9. The method for transferring a rail-mounted crane as described in claim 1, characterized in that, In step 4, the difference in lifting height between the left and right sides of the crane is monitored by displacement sensors on the self-propelled modular transport vehicle group, and the pressure difference between the left and right sides of the self-propelled modular transport vehicle group is monitored in real time to help determine the difference in lifting height between the left and right sides of the crane.

10. The method for transferring a rail-mounted crane as described in claim 1, characterized in that, In step 1, each of the crossbeam fixtures includes a square main beam and triangular reinforcing structures disposed on the front and rear sides of the square main beam. The bottom of the crane is fixedly connected to the square main beam through a plate and a triangular elbow plate. The interior of the square main beam is provided with longitudinal stiffening ribs and transverse partitions.

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