Method for replacing tension bar of cargo handling device, and replacement jig for tension bar of cargo handling device

Abstract

To provide a method for replacing a tension bar of a cargo handling device, and a jig for replacing a tension bar of a cargo handling device, by which the tension bar can be easily replaced.SOLUTION: A method for replacing a tension bar of a cargo handling device includes first step S10 of installing a dummy tension bar 30 in a cargo handling device 1, and second step S20 of applying tension to the dummy tension bar 30. The dummy tension bar 30 is capable of supporting the structure of the cargo handling device 1 in place of an existing tension bar 21. Then, third step S30 is performed to replace the tension bar 21. The new tension bar 21 is ready to support the structure of the cargo handling device 1. In this state, the tension of the dummy tension bar 30 is released and fourth step S40 is executed to remove the dummy tension bar 30, thereby increasing the load acting on the new tension bar 21 and replacement of the tension bar 21 is completed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for replacing a tension bar of a cargo handling device and a jig for replacing a tension bar of a cargo handling device. [Background technology]

[0002] For example, Patent Document 1 describes a cargo handling device that handles objects loaded on a ship. This cargo handling device has a boom that extends horizontally and a tension bar that supports the boom. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-324975 Summary of the Invention [Problem to be solved by the invention]

[0004] In the cargo handling equipment described above, it may be necessary to replace the tension bar. In this case, a vent is extended vertically from the ground to support the tip of the boom. This method has the problem of taking time to set up and remove the vent, which lengthens the construction period and increases costs. In addition, since space must be secured for the vent installation, there are limitations on where the replacement can be performed, making it impossible to freely replace the tension bar at any stopping position of the cargo handling equipment.

[0005] The present invention has been made to solve such problems, and aims to provide a method for replacing a tension bar of a cargo handling device that allows for easy replacement of the tension bar, and a tool for replacing the tension bar of a cargo handling device. [Means for solving the problem]

[0006] The method for replacing a tension bar of a cargo handling device according to the present invention is a method for replacing a tension bar of a cargo handling device, and includes a first step of providing a dummy tension bar in the cargo handling device, a second step of applying tension to the dummy tension bar, a third step of replacing the tension bar, and a fourth step of releasing the tension on the dummy tension bar and removing the dummy tension bar.

[0007] In the method for replacing a tension bar in a cargo handling device according to the present invention, a first step of installing a dummy tension bar in the cargo handling device and a second step of applying tension to the dummy tension bar are carried out. As a result, the dummy tension bar becomes capable of supporting the structure of the cargo handling device in place of the existing tension bar. Next, a third step of replacing the tension bar is carried out. As a result, the new tension bar becomes capable of supporting the structure of the cargo handling device. In this state, the tension on the dummy tension bar is released and a fourth step of removing the dummy tension bar is carried out, thereby increasing the load acting on the new tension bar and completing the replacement of the tension bar. As described above, tension bars can be easily replaced by simply using a dummy tension bar, without the need to install large-scale equipment such as a vent.

[0008] In the second step, tension may be applied to the dummy tension bar using an extension mechanism. By using the extension mechanism, tension can be easily applied to the dummy tension bar.

[0009] The telescopic mechanism may be any of a hydraulic cylinder, an electric cylinder, an air cylinder, a turnbuckle, and a chain block.

[0010] In the first step, a plurality of dummy tension bars may be provided in the cargo handling apparatus, and in the second step, the tension between the plurality of dummy tension bars may be adjusted. This allows the plurality of dummy tension bars to support the structure of the cargo handling apparatus in a balanced manner.

[0011] The load-handling device may have a load-handling unit on one side of the support unit and a balance adjustment unit on the other side of the support unit to balance the load-handling unit. In such a load-handling device, tension bars are provided on both sides of the support unit. Therefore, when replacing the tension bars on both sides of the support unit, the method for replacing tension bars for a load-handling device according to the present invention can be used to efficiently perform the work.

[0012] The tension bar replacement jig for a cargo handling device according to the present invention is a tension bar replacement jig for a cargo handling device for replacing the tension bar of the cargo handling device, and comprises a dummy tension bar provided at a position different from the tension bar provided in the cargo handling device, and an adjustment unit for adjusting the tension of the dummy tension bar.

[0013] The tension bar replacement jig for a cargo handling device according to the present invention can apply and release tension to the dummy tension bar at a position different from the tension bar, making it possible to carry out the above-mentioned method for replacing a tension bar in a cargo handling device, thereby achieving the same effects and advantages as the above-mentioned method for replacing a tension bar in a cargo handling device. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a method for replacing a tension bar of a cargo handling device, which allows easy replacement of the tension bar, and a jig for replacing the tension bar of a cargo handling device. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic side view showing a cargo handling apparatus in which a tension bar replacement jig according to an embodiment of the present invention is used. [Figure 2] FIG. 10 is an enlarged side view showing the configuration of the vicinity of the rear end of the replacement jig. [Figure 3] FIG. 10 is an enlarged side view showing the configuration of the vicinity of the front end of the replacement jig. [Figure 4] FIG. 10 is an enlarged plan view showing the configuration of the vicinity of the front end of the replacement jig. [Figure 5] 5A to 5C are process diagrams showing a method for replacing a tension bar of the cargo handling device according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Preferred embodiments of the present invention will now be described with reference to the drawings. Fig. 1 is a schematic side view showing a cargo handling apparatus 1 to which a tension bar replacement jig according to this embodiment is attached. An unloader is shown as an example of the cargo handling apparatus 1 according to this embodiment. Note that, in addition to unloaders, yard machines such as stackers, reclaimers, and stacker-reclaimers, bridge cranes, and portal cranes may also be used as the cargo handling apparatus 1.

[0017] The cargo handling device 1 is a device that continuously unloads cargo (for example, coal, ore, etc.) from the hold of a ship. The cargo handling device 1 includes a girder 2, a swivel unit 3, a boom 4, a bucket elevator 6, an excavation unit 7 (cargo handling unit), and a balance adjustment unit 8.

[0018] The girder 2 is a device that can travel along the quay wall using two rails laid parallel to the quay wall. The girder 2 is a main body that can be installed on the top surface of the quay wall.

[0019] The swivel unit 3 supports the boom 4 above the girder 2 so that it can swivel. The swivel unit 3 includes a swivel mechanism 10, a portal frame 11 (support unit), and a base unit 12. The swivel mechanism 10 is provided on the upper part of the girder 2, and has a rotating unit that rotates around a rotation axis extending in the vertical direction D3. The portal frame 11 is provided on top of the swivel mechanism 10, and extends upward from the swivel mechanism 10 beyond the boom 4. The base unit 12 is provided on top of the swivel mechanism 10, and supports the boom 4 from below. The portal frame 11 and the base unit 12 support the boom 4 so that it can be raised and lowered.

[0020] The boom 4 is a frame body extending horizontally from the swivel section 3. The boom 4 comprises a first section 4A that extends laterally toward the sea side and supports the bucket elevator 6 and the excavation section 7, and a second section 4B that extends laterally toward the opposite side from the sea side and supports the balance adjustment section 8. The first section 4A of the boom 4 supports the bucket elevator 6 at its tip on the sea side. The second section 4B of the boom 4 supports the balance adjustment section 8 at its end on the opposite side from the sea side.

[0021] The bucket elevator 6 extends downward from the tip of the first section 4A of the boom 4. The bucket elevator 6 transports upward the load unloaded by the excavation section 7. The bucket elevator 6 is designed to maintain a vertical position regardless of the angle at which the boom 4 is raised or lowered.

[0022] The excavation unit 7 unloads cargo from the ship. The excavation unit 7 is provided below the bucket elevator 6. The excavation unit 7 continuously excavates and scrapes out cargo from the hold, and then transports the scraped out cargo upward to unload it.

[0023] The balance adjustment unit 8 is a mechanism that balances the weight between the excavation unit 7 and the balance adjustment unit 8 on the opposite side of the excavation unit 7. The balance adjustment unit 8 includes a balance weight 14 and a weight support unit 16. The balance weight 14 is a cylindrical member that extends horizontally. The balance weight 14 is a member that applies a predetermined weight to the boom 4 on the opposite side of the excavation unit 7, thereby balancing the weight between the excavation unit 7 and the balance adjustment unit 8. The weight support unit 16 is a member that is provided at the tip of the second section 4B of the boom 4 and supports the balance weight 14 from below.

[0024] The loading device 1 has tension bars 20, 21 that transmit loads. The tension bars 20, 21 differ from the replacement jig 100 described later in that they do not have an adjustment unit for adjusting their own tension. In the following description, the direction in which the boom 4 extends is referred to as the "forward-backward direction D1," based on the orientation in which the excavation unit 7 is positioned on the seaward side. The excavation unit 7 side will be referred to as the "front side," and the balance adjustment unit 8 side will be referred to as the "rear side." The horizontal direction perpendicular to the forward-backward direction will sometimes be referred to as the "width direction D2." The width direction D2 coincides with the traveling direction of the girder 2. The direction perpendicular to both the forward-backward direction D1 and the width direction D2 will sometimes be referred to as the "up-down direction D3." The tension bar 20 is a member located on the front side of the portal frame 11 of the swivel unit 3, transmitting the load of the front tip of the boom 4 to the portal frame 11. The tension bar 21 is a member that transmits the load of the rear tip of the boom 4 to the portal frame 11 at the rear side of the portal frame 11 of the swivel section 3. The cargo handling device 1 includes a pair of tension bars 20 aligned in the width direction D2, and a pair of tension bars 21 aligned in the width direction D2.

[0025] The front end of the tension bar 20 is connected to the front tip of the boom 4 via a bracket 22. A support frame 23 that rises upward is provided at the front end of the first section 4A of the boom 4. The bracket 22 is provided near the upper end of the support frame 23. The rear end of the tension bar 20 is connected to the upper end of the portal frame 11 near the upper end via a bracket (not shown). The tension bar 20 extends in the fore-and-aft direction D1 above the first section 4A of the boom 4.

[0026] The rear end of the tension bar 21 is connected to the rear tip of the boom 4 via a bracket 26. The bracket 26 is provided so as to rise upward at the upper end of the balance weight 14 of the balance adjustment unit 8. The front end of the tension bar 21 is connected to the vicinity of the upper end of the portal frame 11 via a bracket 27. The tension bar 21 extends in the fore-and-aft direction D1 above the second section 4B of the boom 4.

[0027] Next, a replacement jig 100 for tension bars of a cargo handling apparatus according to this embodiment will be described. The replacement jig 100 shown in FIG. 1 is a jig for replacing the tension bar 21 on the rear side of the cargo handling apparatus 1. The replacement jig 100 has a dummy tension bar 30 that is provided in a position different from the tension bar 21 provided on the cargo handling apparatus 1. The dummy tension bar 30, like the tension bars 20, 21, is a member that transmits load. The dummy tension bar 30 is made of iron or steel rod material, wire rope, or the like. Here, the dummy tension bar 30 may be provided above the tension bar 21.

[0028] The rear end of the dummy tension bar 30 is connected to the rear tip of the boom 4 via a bracket 31. The bracket 31 is provided so as to rise upward at the upper end of the balance weight 14 of the balance adjustment unit 8. The bracket 31 for the dummy tension bar 30 is provided at a higher position than the bracket 26 for the tension bar 21.

[0029] The front end of the dummy tension bar 30 is connected to the vicinity of the upper end of the portal frame 11 via a bracket 32. The bracket 32 ​​for the dummy tension bar 30 is provided at a higher position than the bracket 27 for the tension bar 21. The dummy tension bar 30 extends in the front-to-rear direction D1 above the second portion 4B of the boom 4 and the tension bar 21.

[0030] The configuration of the replacement jig 100 will be described in more detail with reference to Figures 2 to 4. Figure 2 is an enlarged side view showing the configuration near the rear end of the replacement jig 100. Figure 3 is an enlarged side view showing the configuration near the front end of the replacement jig 100. Figure 4 is an enlarged plan view showing the configuration near the front end of the replacement jig 100.

[0031] As shown in FIG. 2, the bracket 31 extends upward from approximately the same position on the balance weight 14 as the bracket 26 for the tension bar 21. The bracket 31 and the dummy tension bar 30 are rotatably connected by a pin. The bracket 26 and the tension bar 21 are rotatably connected by a pin. The pin connecting the bracket 31 and the dummy tension bar 30 is positioned above and spaced apart from the pin connecting the bracket 26 and the tension bar 21. This positions the dummy tension bar 30 and the tension bar 21 in parallel and spaced apart from each other in the up-down direction D3.

[0032] 3 and 4, the bracket 32 ​​is provided on the rear side surface 11a of the portal frame 11. The bracket 32 ​​is provided at a position spaced upward from the bracket 27 for the tension bar 21. The replacement jig 100 also includes an adjustment unit 33.

[0033] The adjustment unit 33 is a mechanism for adjusting the tension of the dummy tension bar 30. The adjustment unit 33 is not particularly limited as long as it is a mechanism capable of adjusting the tension of the dummy tension bar 30. The tension of the dummy tension bar 30 may be adjusted by the extension and contraction of the adjustment unit 33. In this case, an extension and contraction mechanism is used as the adjustment unit 33. Such an adjustment unit 33 is selected from, for example, a hydraulic cylinder, an electric cylinder, an air cylinder, a turnbuckle, a chain block, or the like, depending on the required tension. In this example, a hydraulic cylinder is used. The hydraulic cylinder of the adjustment unit 33 has a cylinder portion 33a and a rod portion 33b. The adjustment unit 33 adjusts the amount of protrusion of the rod portion 33b from the cylinder portion 33a by moving a piston connected to the rod portion 33b back and forth within the cylinder portion 33a. The adjustment unit 33 can increase the tension of the dummy tension bar 30 by decreasing the amount of protrusion of the rod portion 33b from the cylinder portion 33a. The tension of the dummy tension bar 30 may be adjusted, for example, based on the pressure value of the hydraulic cylinder.

[0034] The bracket 27 and the front end of the rod portion 33b of the adjustment portion 33 are connected via joints 34 and 36. The bracket 27 and joint 34, the joint 34 and joint 36, and the joint 36 and rod portion 33b are each connected by a pin. The front end of the dummy tension bar 30 and the rear end of the cylinder portion 33a of the adjustment portion 33 are connected via joint 37. The cylinder portion 33a and joint 37, and the joint 37 and dummy tension bar 30 are each connected by a pin. There is no particular limitation on the number of joints, etc.

[0035] The replacement jig 100 is provided to correspond to the existing tension bars 20, 21. As shown in FIG. 4, multiple (two in this case) replacement jigs 100 may be provided for the cargo handling apparatus 1. Therefore, multiple (two in this case) dummy tension bars 30 are provided for the cargo handling apparatus 1. The two dummy tension bars 30 are arranged parallel to each other and spaced apart in the width direction D2. The position of each dummy tension bar 30 in the width direction D2 is not particularly limited, but may be approximately the same position as the tension bar 21 below it. The replacement jig 100 on one side and the replacement jig 100 on the other side in the width direction D2 have the same configuration. Therefore, the tension between the dummy tension bars 30 on both sides can be adjusted by the adjustment unit 33 of the replacement jig 100 on one side and the adjustment unit 33 of the replacement jig 100 on the other side. This allows for balanced tension to be applied to the dummy tension bars 30 on both sides of the width direction D2 of the cargo handling apparatus 1.

[0036] Next, a method for replacing the tension bar 21 of the cargo handling apparatus 1 according to this embodiment will be described with reference to Fig. 5. As shown in Fig. 5, first, a step (step S10: first step) of providing dummy tension bars 30 in the cargo handling apparatus 1 is performed. In this step S10, dummy tension bars 30 are provided in the cargo handling apparatus 1 in a number corresponding to the number of tension bars 21 already provided therein.

[0037] Next, a step of applying tension to the dummy tension bar 30 (step S20: second step) is carried out. In step S20, tension is applied to the dummy tension bar 30 using a hydraulic cylinder as the adjustment unit 33. In this case, the tension of the dummy tension bar 30 is increased by contracting the hydraulic cylinder of the adjustment unit 33, thereby reducing the load acting on the tension bar 21. Also, in step S20, the tension between the multiple dummy tension bars 30 is adjusted. As a result, the dummy tension bars 30 are placed in a state where they support the structure on the rear side of the cargo handling apparatus 1 in place of the existing tension bars 21.

[0038] Next, a step of replacing the tension bar 21 (step S30: third step) is carried out. This enables the new tension bar 21 to support the structure behind the cargo handling apparatus 1. Next, a step of releasing the tension of the dummy tension bar 30 and removing the dummy tension bar 30 (step S40: fourth step) is carried out. In step S40, the hydraulic cylinder of the adjustment unit 33 is extended to reduce the tension of the dummy tension bar 30. Accordingly, the load acting on the new tension bar 21 is increased. Once the tension of the dummy tension bar 30 has been sufficiently reduced, the dummy tension bar 30 is removed. This completes the replacement of the tension bar 21 in the cargo handling apparatus 1.

[0039] When replacing the front tension bar 20, a replacement jig similar to the replacement jig 100 is provided in the area forward of the gate-shaped frame 11, and steps similar to those of the replacement method shown in Figure 5 are carried out.

[0040] Next, a method for replacing the tension bar of the cargo handling apparatus according to this embodiment, and the operation and effect of the replacement jig 100 will be described.

[0041] In the method for replacing the tension bar 21 of the cargo handling apparatus 1 according to this embodiment, a first step S10 is performed to install a dummy tension bar 30 in the cargo handling apparatus 1, and a second step S20 is performed to apply tension to the dummy tension bar 30. As a result, the dummy tension bar 30 becomes capable of supporting the structure of the cargo handling apparatus 1 in place of the existing tension bar 21. Next, a third step S30 is performed to replace the tension bar 21. As a result, the new tension bar 21 becomes capable of supporting the structure of the cargo handling apparatus 1. In this state, the tension of the dummy tension bar 30 is released, and a fourth step S40 is performed to remove the dummy tension bar 30, thereby increasing the load acting on the new tension bar 21 and completing the replacement of the tension bar 21. As described above, the tension bar 21 can be easily replaced by simply using the dummy tension bar 30, without the need to install large-scale equipment such as a vent.

[0042] In the second step S20, tension may be applied to the dummy tension bar 30 using an extension mechanism as the adjustment unit 33. By using a hydraulic cylinder, tension can be easily applied to the dummy tension bar 30.

[0043] The telescopic mechanism may be any of a hydraulic cylinder, an electric cylinder, an air cylinder, a turnbuckle, and a chain block.

[0044] In the first step S10, multiple dummy tension bars 30 may be provided on the cargo handling apparatus 1, and in the second step S20, the tension between the multiple dummy tension bars 30 may be adjusted. This allows the multiple dummy tension bars 30 to support the structure of the cargo handling apparatus 1 in a well-balanced manner.

[0045] The cargo handling apparatus 1 may have an excavation section 7 on one side of a portal frame 11 (support section), and a balance adjustment section 8 on the other side of the portal frame 11 for balancing with the excavation section 7. In such a cargo handling apparatus 1, tension bars 20, 21 are provided on both sides of the portal frame 11. Therefore, when replacing the tension bars 20, 21 on both sides of the portal frame 11, the work can be performed efficiently by adopting the method for replacing the tension bars 20, 21 of the cargo handling apparatus 1 according to this embodiment.

[0046] The replacement jig 100 for the tension bar 21 of the loading device 1 in this embodiment is a replacement jig 100 for the tension bar 21 of the loading device 1 for replacing the tension bar 21 of the loading device 1, and is equipped with a dummy tension bar 30 that is provided at a position different from the tension bar 21 provided in the loading device 1, and an adjustment unit 33 that adjusts the tension of the dummy tension bar 30.

[0047] The replacement jig for the tension bar 21 of the cargo handling apparatus 1 according to this embodiment can apply and release tension to the dummy tension bar 30 at a position different from the tension bar 21, making it possible to carry out the above-described method for replacing the tension bar 21 of the cargo handling apparatus 1. This allows for the same effects and advantages as the above-described method for replacing the tension bar 21 of the cargo handling apparatus 1.

[0048] The present invention is not limited to the above-described embodiments.

[0049] For example, the positional relationship between the tension bar 21 and the dummy tension bar 30 is not particularly limited.

[0050] Furthermore, there are no particular limitations on where the adjustment part 33 is provided between the bracket 31 and the bracket 32. For example, the adjustment part 33 may be provided between the dummy tension bar 30 and the rear bracket 31, or may be provided midway in the longitudinal direction of the dummy tension bar 30. [Explanation of symbols]

[0051] 1...loading device, 11...portion-shaped frame (support part), 20, 21...tension bar, 30...dummy tension bar, 33...adjustment part (extension mechanism), 100...replacement jig.

Claims

1. A method for replacing a tension bar of a cargo handling device, comprising: a first step of providing a dummy tension bar in the cargo handling device; a second step of applying tension to the dummy tension bar; a third step of replacing the tension bar; and a fourth step of releasing the tension of the dummy tension bar and removing the dummy tension bar.

2. 2. The method for replacing a tension bar of a cargo handling apparatus according to claim 1, wherein in the second step, tension is applied to the dummy tension bar using an extension / contraction mechanism.

3. 3. The method for replacing a tension bar of a cargo handling apparatus according to claim 2, wherein the extension mechanism is one of a hydraulic cylinder, an electric cylinder, an air cylinder, a turnbuckle, and a chain block.

4. In the first step, a plurality of the dummy tension bars are provided in the cargo handling device, 4. The tension bar replacement method for a cargo handling apparatus according to claim 1, wherein in the second step, tensions between the plurality of dummy tension bars are adjusted.

5. 5. The method for replacing a tension bar of a loading device according to claim 1, wherein the loading device has a loading section on one side of a support section, and a balance adjustment section on the other side of the support section that balances with the loading section.

6. A tension bar replacement jig for a cargo handling device for replacing a tension bar of the cargo handling device, a dummy tension bar provided at a position different from that of the tension bar provided in the cargo handling device; and an adjustment unit that adjusts the tension of the dummy tension bar.

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