Self-guiding container lifting appliance and container lifting structure

Abstract

The utility model belongs to the field of container lifting appliances, and discloses a self-guiding container lifting appliance and a container lifting structure, which comprise a mounting base provided with a mounting base base part which is bent along the extending direction of the mounting base base part to form a mounting base bent part, and a hydraulic motor mounted on the upper surface of the mounting base, the hydraulic motor is arranged on the mounting base and extends in the extension direction of the base of the mounting base, the hydraulic motor is provided with a first rotating shaft, one end of the connecting rod mechanism is rotationally mounted on the base part of the mounting base through the first rotating shaft, and the first guide plate is rotationally mounted on the bending part of the mounting base through a second rotating shaft; one side wall of the first guide plate is hinged to one end of the connecting rod mechanism through a third rotating shaft; the hydraulic motor drives the connecting rod mechanism to move so as to move the first guide plate. When entering a cabin, the container lifting appliance disclosed by the utility model is guided by the first guide plate, so that the lifting appliance safely and quickly enters the cabin to lift a container, and the loading and unloading operation efficiency of the container is improved.

Description

Technical Field

[0001] This utility model belongs to the field of container spreaders, specifically relating to self-guiding container spreaders and container lifting structures. Background Technology

[0002] Container spreaders are devices used in container lifting machinery to lift and retrieve containers. They are typically made of materials such as wire ropes, steel chains, steel plates, and steel pipes, and are used in the logistics industry, ports and docks, and the shipping industry.

[0003] Current container spreaders lack guiding structures, and because the cab is relatively high above the ship's hold (e.g., 40 meters), they often get stuck at the top entrance of the hold when entering the container ship's hold. This prevents them from accurately and smoothly entering the hold to retrieve containers, requiring repeated adjustments to their entry posture, which severely reduces the efficiency of container loading and unloading. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a self-guiding container spreader and a container lifting structure, which aims to enable the container spreader to accurately enter the bottom compartment of a container ship and efficiently lift containers through the guidance of a guiding mechanism.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A self-guided container spreader, comprising,

[0007] The mounting base has a mounting base portion, which is bent along its own extending direction to form a mounting base bending portion.

[0008] It also includes,

[0009] A drive mechanism is mounted on the upper surface of the mounting base and extends along the base extension direction of the mounting base, and the drive mechanism has a first rotating shaft.

[0010] The linkage mechanism, one end of which is rotatably mounted on the base of the mounting base via a first rotating shaft,

[0011] A first guide plate is rotatably mounted on the bent part of the mounting base via a second rotating shaft, and one side wall of the first guide plate is hinged to one end of the linkage mechanism via a third rotating shaft.

[0012] The first guide plate has a first guide surface and a second guide surface, and there are two second guide surfaces. The first guide surface and the two second guide surfaces are both inclined. The first guide surface is adjacent to the two second guide surfaces, and the two second guide surfaces correspond to each other. The first guide surface and the second guide surface are both aligned with the rails on the container ship. The first guide plate can quickly enter the rails on the container ship via the first guide surface and the second guide surface. The first guide plate is driven by a linkage mechanism to move.

[0013] Preferably, the linkage mechanism, the mounting base, and the first guide plate form a four-bar linkage structure.

[0014] Preferably, the first rotating shaft is rotatably mounted on the base of the mounting base.

[0015] The linkage mechanism includes a first link and a second link. One end of the first link is rotatably connected to the first rotating shaft, and the other end of the first link is rotatably connected to one end of the second link via a fourth rotating shaft. The other end of the second link is rotatably connected to the third rotating shaft.

[0016] Preferably, the second rotating shaft is rotatably mounted on the bending portion of the mounting base, the first guide plate includes a first guide plate connecting portion and a first guide plate guiding portion, one end of the first guide plate connecting portion is connected to the first guide plate guiding portion, the other end of the first guide plate connecting portion is rotatably connected to the bending portion of the mounting base via the second rotating shaft, and the first guide plate guiding portion is rotatably connected to the second connecting rod via a third rotating shaft.

[0017] Preferably, the base of the mounting base has a mounting base cavity inside, the bent portion of the mounting base has a bent portion cavity inside, the base cavity extends along the lower surface of the base of the mounting base and is open, the bent portion cavity is open along one side wall of the bent portion of the mounting base, and the bent portion cavity and the base cavity are connected.

[0018] The mounting base base chamber extends and opens along one end of the mounting base base, and the mounting base bending section chamber extends and opens along the lower surface of the mounting base bending section.

[0019] Furthermore, the first connecting rod extends into the cavity of the mounting base base along the open portion of the mounting base base and is rotatably connected to the first rotating shaft located in the cavity of the mounting base base; the first guide plate connecting portion extends into the cavity of the bending portion of the mounting base along the open portion of the mounting base and is rotatably connected to the second rotating shaft located in the cavity of the bending portion of the mounting base.

[0020] Preferably, the first guide plate guide portion has a first guide plate connecting section and a first guide plate guide section, one end of the first guide plate connecting section is connected to the first guide plate connecting portion, and the other end is connected to the first guide plate guide section.

[0021] Preferably, the first guide plate connecting segment has a connecting segment cavity, which is open along one side wall of the first guide plate connecting segment and serves as the opening of the first guide plate connecting segment. One end of the second connecting rod extends into the connecting segment cavity through the opening of the first guide plate connecting segment and is rotatably connected to the third rotating shaft located in the connecting segment cavity.

[0022] Preferably, the direction in which the first guide plate moves toward the lower surface of the base of the mounting base is taken as the direction of movement, and a third guide surface is provided on the side of the first guide plate facing the direction of movement.

[0023] Preferably, the third guide surface is at an angle of 60-70° to the horizontal plane.

[0024] A container lifting structure includes a U-shaped structural frame with two parallel crossbeams. Each crossbeam has a self-guiding container spreader installed at both ends, and the four self-guiding spreaders are matched with the four corners of the container.

[0025] Preferably, a height position sensor is installed on the frame, with the sensing end of the height position sensor facing vertically downward and extending out of the bottom of the frame, for detecting the distance between the spreader and the container in the ship's hold.

[0026] Preferably, the drive mechanism is a hydraulic motor.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] 1. The lifting device of this utility model includes a mounting base having a mounting base base portion, the mounting base base portion being bent along its own extension direction to form a mounting base bent portion, and also includes a drive mechanism mounted on the upper surface of the mounting base and extending along the extension direction of the mounting base base, and the drive mechanism having a first rotating shaft, a linkage mechanism, one end of which is rotatably mounted on the mounting base base via the first rotating shaft, and a first guide plate, which is rotatably mounted on the mounting base bent portion via a second rotating shaft, and one side wall of the first guide plate is hinged to one end of the linkage mechanism via a third rotating shaft; the first guide plate has a first guide surface and a second guide surface respectively, and there are two second guide surfaces, the first guide surface and the two second guide surfaces are all inclined, and the first guide surface... The first guide plate is adjacent to and corresponds to two second guide plates. Both the first and second guide plates correspond to the tracks on the container ship. The first guide plate can quickly enter the tracks on the container ship via the first and second guide plates. The first guide plate is driven by a linkage mechanism to move. The purpose is to ensure that the spreader is accurately aligned with the container under the guidance of the first guide plate, so as to grab or release the container inside the container ship. That is, when the spreader enters the hold, it is guided by the first guide plate to ensure the spreader's safe and rapid entry into the hold for container lifting, thereby improving the efficiency of container loading and unloading operations and facilitating the safety of spreaders on the quay crane. It is automatic and efficient in entering the hold, eliminating manual intervention and gradually realizing the full automation of quay crane container loading and unloading.

[0029] 2. The lifting device in this utility model includes a linkage mechanism; the mounting base and the first guide plate form a four-bar linkage structure; the purpose is to activate the drive mechanism, thereby driving the four-bar linkage structure to move, so that the first guide plate deflects relative to the mounting base; thereby realizing the grabbing or releasing of containers with the assistance of the first guide plate.

[0030] 3. The lifting device of this utility model has a linkage mechanism including a first link and a second link. One end of the first link is rotatably connected to a first rotating shaft, and the other end is rotatably connected to one end of the second link via a fourth rotating shaft. The other end of the second link is rotatably connected to a third rotating shaft. The second rotating shaft is rotatably mounted on the bent part of the mounting base. The first guide plate includes a first guide plate connecting part and a first guide plate guiding part. One end of the first guide plate connecting part is connected to the first guide plate guiding part, and the other end of the first guide plate connecting part is rotatably connected to the bent part of the mounting base via a second rotating shaft. The first guide plate guiding part is rotatably connected to the second link via a third rotating shaft. The purpose is to start the drive mechanism, drive the first rotating shaft to rotate, thereby driving the first link to deflect. Then, under the connection of the fourth rotating shaft, the second link is driven to deflect, thereby driving the rotation of the third rotating shaft. This causes the first guide plate to deflect relative to the bent part of the mounting base under the connection of the second rotating shaft, ultimately achieving the deflection of the first guide plate relative to the mounting base, thereby enabling the grabbing or release of containers with the assistance of the first guide plate.

[0031] 4. Because the lifting device in this utility model uses the direction of movement of the first guide plate toward the lower surface of the mounting base as the direction of movement, and a third guide surface is provided on the side of the first guide plate facing the direction of movement; the purpose is to use the third guide surface to better fit with the outer wall of the container when clamping the container, so as to grip the container more tightly.

[0032] 5. Because the third guide surface of the spreader in this utility model is at a 60-70° angle to the horizontal plane, the purpose is to facilitate the spreader to automatically and quickly enter the guide channel on the container ship.

[0033] 6. The lifting structure in this utility model includes a "U"-shaped structural frame with two parallel crossbeams. Each crossbeam has self-guiding spreaders installed at both ends, and the four self-guiding spreaders match the four corners of the container. The purpose is to use the self-guiding spreaders to clamp the container under the guidance of the first guide plate, so that when the spreader enters the hold, it can safely and quickly enter the hold to lift the container, thereby improving the efficiency of container loading and unloading operations. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the first guide plate in the lifting device of this utility model when it is fully retracted;

[0035] Figure 2 This is a front view of the first guide plate in the lifting device of this utility model when it is fully retracted;

[0036] Figure 3 This is a top view of the lifting device of this utility model when the first guide plate is fully retracted;

[0037] Figure 4 This is a side view of the lifting device of this utility model when the first guide plate is fully retracted;

[0038] Figure 5 This is a three-dimensional structural diagram of the lifting device of this utility model when the first guide plate is fully lowered;

[0039] Figure 6 This is a front view of the first guide plate in the lifting device of this utility model when it is fully lowered;

[0040] Figure 7 This is a top view of the lifting device of this utility model when the first guide plate is fully lowered;

[0041] Figure 8 This is a side view of the lifting device of this utility model when the first guide plate is fully lowered;

[0042] Figure 9 This is a front view of the present invention in Embodiment 2;

[0043] Figure 10 for Figure 9 Enlarged detail image;

[0044] Figure 11 This is a top view of the present invention in Embodiment 2.

[0045] In the figure: mounting base 1; mounting base base 101; mounting base bending part 102; hydraulic motor 2; first rotating shaft 21; linkage mechanism 3; first connecting rod 31; second connecting rod 32; first guide plate 4; first guide plate connecting part 41; first guide plate guiding part 42; first guide plate connecting section 421; first guide plate guiding section 422; third guide surface 43; first guide surface 44; second guide surface 45; second rotating shaft 5; third rotating shaft 6; fourth rotating shaft 7; frame 8; crossbeam 81; motor 9; crank arm 10; first sensor 11; second sensor 12; fixing plate 13; second guide plate 14. Detailed Implementation

[0046] To make the technical means, creative features, and objectives and effects of this utility model easier to understand, the following embodiments, in conjunction with the accompanying drawings, will specifically illustrate the technical solution of this utility model. It should be noted that the description of these embodiments is for the purpose of helping to understand this utility model, but does not constitute a limitation on this utility model.

[0047] Example 1

[0048] like Figure 1-8 As shown, a self-guiding container spreader includes,

[0049] The mounting base 1 has a mounting base base 101, which is bent along its extending direction to form a mounting base bent portion 102.

[0050] A hydraulic motor 2 is mounted on the upper surface of the mounting base 1 and extends along the extension direction of the mounting base 101, and the hydraulic motor 2 has a first rotating shaft 21.

[0051] Linkage mechanism 3, one end of which is rotatably mounted on the base 101 of the mounting base via the first rotating shaft 21.

[0052] The first guide plate 4 is rotatably mounted on the bent part 102 of the mounting base via the second rotating shaft 5, and one side wall of the first guide plate 4 is hinged to one end of the linkage mechanism 3 via the third rotating shaft 6.

[0053] The first guide plate 4 has a first guide surface 44 and a second guide surface 45, and there are two second guide surfaces 45. The first guide surface 44 and the two second guide surfaces 45 are both inclined, and the first guide surface 44 is adjacent to the two second guide surfaces 45 and the two second guide surfaces 45 correspond to each other. The first guide surface 44 and the second guide surface 45 correspond to the rails on the container ship. The first guide plate 4 can quickly enter the rails on the container ship via the first guide surface 44 and the second guide surface 45. (It should be noted that the rails on the container ship are set vertically from the deck to the bottom of the ship, and the shape of the rails matches the first guide surface 44 and the second guide surface 45. The purpose is to allow the spreader to quickly enter the rails when the first guide surface 44 and the second guide surface 45 match the rails, so that the container can be lifted smoothly at a high height.) The first guide plate 4 is driven by the hydraulic motor 2 to move the linkage mechanism 3, so that the spreader is accurately aligned with the container under the guidance of the first guide plate 4, thereby grabbing or releasing the container in the container ship hold.

[0054] Linkage mechanism 3; the mounting base 1 and the first guide plate 4 form a four-bar linkage structure; the purpose is to start the hydraulic motor, thereby driving the four-bar linkage structure to move, so that the first guide plate 4 deflects relative to the mounting base; thereby realizing the gripping or release of containers with the assistance of the first guide plate 4; specifically: the first rotating shaft 21 is rotatably mounted on the base 101 of the mounting base, the linkage mechanism 3 includes a first link 31 and a second link 32, one end of the first link 31 is rotatably connected to the first rotating shaft 21, and its other end is rotatably connected to one end of the second link 32 through a fourth rotating shaft 7, and the other end of the second link 32 is rotatably connected to a third rotating shaft 6; the second rotating shaft 5 is rotatably mounted on the bending part 102 of the mounting base, and the first guide plate 4 includes a first guide plate connecting part 41 and a first guide plate guiding part 42. One end of the first guide plate connecting part 41 is connected to the first guide plate guiding part 42, and the other end of the first guide plate connecting part 41 is rotatably connected to the bending part 102 of the mounting base via the second rotating shaft 5. The first guide plate guiding part 42 is rotatably connected to the second connecting rod 32 via the third rotating shaft 6. The purpose is to start the hydraulic motor 2, drive the first rotating shaft 21 to rotate, thereby driving the first connecting rod 31 to deflect. Then, under the connection of the fourth rotating shaft 7, the second connecting rod 32 is driven to deflect, thereby driving the rotation of the third rotating shaft 6. Subsequently, the first guide plate 4 is driven to deflect relative to the bending part 102 of the mounting base under the connection of the second rotating shaft 5, ultimately achieving the deflection of the first guide plate 4 relative to the mounting base 1, thereby enabling the grabbing or release of containers with the assistance of the first guide plate 4. Specifically, as follows: Figure 5 As shown, when the spreader is working in the ship's hold, when the first guide plate 4 is lowered, the first guide plate 4 will first contact the ship's hold guide groove.

[0055] In addition, the mounting base base 101 has a mounting base base chamber inside, and the mounting base bending portion 102 has a mounting base bending portion chamber inside. The mounting base base chamber extends along the lower surface of the mounting base base 101 and is open. The mounting base bending portion chamber is open along one side wall of the mounting base bending portion 102, and the mounting base bending portion chamber and the mounting base base chamber are connected. The mounting base base chamber also extends along one end of the mounting base base 101 and is open. The mounting base bending portion chamber also extends along the lower surface of the mounting base bending portion 102 and is open. The first connecting rod 31 extends into the mounting base base chamber along the opening of the mounting base base 101 and is rotatably connected to the first rotating shaft 21 located in the mounting base base chamber. The first guide plate connecting portion 41 extends along the opening of the mounting base bending portion 102. The first guide plate 4 extends into the bending cavity of the mounting base and is rotatably connected to the second rotating shaft 5 located within the bending cavity of the mounting base. The first guide plate guide portion 42 has a first guide plate connecting section 421 and a first guide plate guide section 422. One end of the first guide plate connecting section 421 is connected to the first guide plate connecting portion 41, and the other end is connected to the first guide plate guide section 422. The first guide plate connecting section 421 has a connecting section cavity, which is open along one side wall of the first guide plate connecting section 421 and serves as the opening of the first guide plate connecting section. One end of the second connecting rod 32 extends into the connecting section cavity through the opening of the first guide plate connecting section 421 and is rotatably connected to the third rotating shaft 6 located within the connecting section cavity. The purpose of this scheme is that the first guide plate 4 enters the connecting section cavity via a four-bar linkage structure (e.g., ...). Figure 1 , 2 As shown), the distance between the bottom surface of the retracted first guide plate 4 and the container is less than the distance between the bottom of the pin and the container, that is, the first guide plate 4 will not hinder the pin from being inserted into the container when it is retracted (the pin is a commonly used structure in the container field on the spreader, mainly to insert the pin into the top of the container, and then use the clamp to grab the container, so that the spreader can grab the container in two ways).

[0056] The direction of movement of the first guide plate 4 toward the lower surface of the mounting base 101 is taken as the movement direction A. A third guide surface 43 is provided on the side of the first guide plate 4 facing the movement direction A. The purpose is to better fit with the outer wall of the container when clamping the container with the cooperation of the first guide surface 43, so as to grip the container more tightly. Specifically, the third guide surface is at 60-70° with the horizontal plane, which is to facilitate the automatic and rapid entry of the spreader into the guide channel of the container ship.

[0057] In addition, such as Figure 1 and 5As shown, a first sensor 11 and a second sensor 12 are respectively mounted on the base 101 of the mounting base by fasteners. The fasteners on the first sensor 11 are arranged along the axial direction of the first rotating shaft 21, and the fasteners on the second sensor 12 are arranged along the radial direction of the first rotating shaft 21. The first sensor 11 and the second sensor 12 are respectively fixed vertically to their corresponding fasteners, and the sensing ends of the first sensor 11 and the second sensor 12 are respectively vertically downward. In addition, the sensing end of the first sensor 11 faces the end of the base 101 of the mounting base. The purpose is to detect the state of the first guide plate 4 when it is lowered by the first sensor 11 (e.g., ...). Figure 5 , 6 As shown in Figure 1, the purpose of the second sensor 12 is to detect the state of the first guide plate 4 when it is lifted, as shown in Figure 1 and Figure 2, by means of the first sensor 11.

[0058] In addition, it should be noted that the first guide plate 4 is automatically extended and retracted when the hydraulic motor 2 drives the four-bar linkage structure. Furthermore, the first guide plate 4 is only used during unloading operations inside the hold and is not used during deck loading and unloading operations or loading operations inside the hold.

[0059] Furthermore, the first guide plate 4 is equipped with a self-locking mechanism in the retracted state to prevent it from falling due to its own weight in the event of guide plate brake failure (the self-locking of the first guide plate 4 is mainly achieved by a hydraulic motor 2 with a self-locking function available on the market. Since the hydraulic motor 2 has a self-locking function, the four-bar linkage structure can be self-locked, thereby making the first guide plate 4 self-locked in the retracted state).

[0060] Example 2

[0061] like Figure 9-11 As shown, a container lifting structure includes a U-shaped structural frame 8, which has two parallel crossbeams 81.

[0062] Each beam 81 is equipped with a self-guiding spreader as described in Example 1 at both ends. The four self-guiding spreaders are matched with the four corners of the container. The hydraulic motors 2 on the four self-guiding spreaders can operate individually or simultaneously, specifically as follows: Figure 11 As shown, in Embodiment 1, a fixing plate 13 is installed on the bending part 102 of the mounting base in the self-guiding lifting device. The fixing plate 13 is fixed to the beam fixing seat on the beam 81 by bolts.

[0063] like Figure 9-10As shown, a motor mounting base is installed on the crossbeam fixing seat, and a motor 9 is installed on the motor mounting base. The motor 9 has a motor output shaft, and two crank arms 10 are installed on the output shaft. The two crank arms 10 are symmetrical with respect to the axial direction of the motor output shaft, and both crank arms 10 correspond to the spreader in Embodiment 1. The purpose is to start the motor 9, and its motor output shaft rotates, which drives the crank arms 10 to rotate, thereby pushing the spreader in Embodiment 1 to rotate relative to the motor output shaft. The two spreaders on the frame 8 move towards or away from the frame 8 to grab or release the container (it should be noted that the frame 8 also has a fixing pin (not shown in the figure) for inserting into the pin hole of the container). In addition, it should also be noted that... Figure 11 The middle did not draw such as Figure 9-10 The motor mounting bracket shown; motor 9 and crank arm 10.

[0064] Additionally, it should be noted that a height position sensor is also installed on frame 8, with the sensing end of the sensor pointing vertically downwards and extending out from the bottom of frame 8, in order to detect the distance between the spreader and the container inside the ship's hold.

[0065] Other examples Figure 9 and Figure 10 As shown, a second guide plate 14 is also provided on the crossbeam fixing seat. The second guide plate 14 is located outside the first guide plate 4 and extends in the vertical direction. Its purpose is mainly to guide in each container compartment of the container ship.

[0066] The above embodiments are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Various modifications or variations that can be made by those skilled in the art without creative effort within the scope of the appended claims are still within the scope of protection of this patent.

Claims

1. A self-guided container spreader, an installation base, which has an installation base base, and the installation base base is bent along its own extension direction to form an installation base bending part, and is characterized in that, It further includes, A driving mechanism, which is installed on the upper surface of the installation base and extends along the extension direction of the installation base base, and the driving mechanism has a first rotating shaft, A connecting rod mechanism, one end of which is rotatably installed on the installation base base through the first rotating shaft, A first guide plate, which is rotatably installed on the installation base bending part through a second rotating shaft, and one side wall of the first guide plate is hinged to one end of the connecting rod mechanism through a third rotating shaft; The first guide plate respectively has a first guide surface and a second guide surface, and the number of the second guide surfaces is two. The first guide surface and the two second guide surfaces are both inclined, and the first guide surface is adjacent to the two second guide surfaces, and the two second guide surfaces correspond to each other, so that the first guide surface and the second guide surface both correspond to the track on the container ship, and the first guide plate can quickly enter the track on the container ship through the first guide surface and the second guide surface; The first guide plate is driven by the driving mechanism to move the connecting rod mechanism.

2. The self-guided container spreader according to claim 1, wherein: The connecting rod mechanism; the installation base and the first guide plate form a four-bar linkage structure.

3. The self-guided container spreader according to claim 2, wherein: The first rotating shaft is rotatably installed on the installation base base, The connecting rod mechanism includes a first connecting rod and a second connecting rod. One end of the first connecting rod is rotatably connected to the first rotating shaft, and the other end thereof is rotatably connected to one end of the second connecting rod through a fourth rotating shaft. The other end of the second connecting rod is rotatably connected to the third rotating shaft.

4. The self-guided container spreader according to claim 3, wherein: The second rotating shaft is rotatably installed on the installation base bending part. The first guide plate includes a first guide plate connecting part and a first guide plate guiding part. One end of the first guide plate connecting part is connected to the first guide plate guiding part, and the other end of the first guide plate connecting part is rotatably connected to the installation base bending part through the second rotating shaft. The first guide plate guiding part is rotatably connected to the second connecting rod through the third rotating shaft.

5. The self-guided container spreader according to claim 4, wherein: Taking the movement direction of the first guide plate towards the lower surface of the installation base base as the movement direction, a third guide surface is arranged on one side of the first guide plate facing the movement direction.

6. The self-guided container spreader according to claim 5, wherein: The third guide surface forms an angle of 60-70° with the horizontal plane.

7. A lifting structure for a container, characterized in that: It includes a "mouth"-shaped structural frame, which has two parallel cross beams, Each end of each cross beam is installed with the self-guided container spreader according to any one of claims 1-6, and the four self-guided container spreaders match the four-corner structure of the container.

8. The container lifting structure according to claim 7, characterized in that: A height position sensor is installed on the frame, with the sensing end of the height position sensor facing vertically downward and extending out of the bottom of the frame, for detecting the distance between the spreader and the container in the ship's hold.

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