Marine crane boom luffing angle monitoring device and system

Abstract

This utility model discloses a boom luffing angle monitoring device for marine cranes, including a fixed assembly. One end of the fixed assembly is connected to an angle monitoring component, and the other end is fixed to the crane tower. A transmission assembly is driven to the rear end of the angle monitoring component. A limit switch unit is installed on the fixed assembly, and a sensing unit is installed on the transmission assembly. The switch unit emits a corresponding sensing signal based on whether it is in contact with the sensing unit, and the angle monitoring component monitors the luffing angle in real time. This utility model also discloses a boom luffing angle monitoring system for marine cranes. This utility model is applicable to rotating boom mounting shafts, can accurately measure the boom elevation angle, assist the operator in controlling the boom luffing posture in real time, and reduce the difficulty of boom luffing operation. Furthermore, it can control the upper and lower limit angles of the boom luffing, preventing the boom from exceeding its usage limits due to improper operation, thus improving the safety and reliability of the boom luffing.

Description

Technical Field

[0001] This utility model relates to the technical field of marine crane equipment, and in particular to a marine crane boom luffing angle monitoring device and system. Background Technology

[0002] Marine cranes are key equipment for cargo loading and unloading, emergency rescue, and other tasks, and their importance in shipbuilding or marine engineering is self-evident.

[0003] The luffing function, which adjusts the working radius and hook height by adjusting the boom elevation angle, is one of the core functions of a crane's normal operation and is crucial to its operational efficiency, safety, and adaptability. To ensure the crane's operational safety and improve its control precision, it is necessary to monitor the crane's luffing angle, accurately and stably obtain the boom luffing angle parameters, and control the boom's luffing angle limits.

[0004] Currently, marine crane luffing angle monitoring devices can be broadly classified into two categories. The first category is the mechanical pointer type, which involves installing a movable pointer on the boom body. Gravity affects the pointer's angle to monitor the boom's elevation angle. This type of device is significantly affected by the ship's attitude and has relatively low accuracy. The second category is the angle encoder type, which uses an angle encoder installed at the boom's slewing shaft to monitor the rotation angle of rotating components. A program controls the upper and lower limit angles of the boom's luffing. This type of device offers high measurement accuracy, good stability, and is less affected by environmental factors.

[0005] Depending on the installation method of the crane boom, there are two types of boom mounting shafts: fixed and rotating. A fixed boom mounting shaft is fixed to the tower end and does not rotate during boom luffing. A rotating boom mounting shaft is fixed to the boom end and rotates with boom luffing. Currently, common angle encoder-type luffing angle monitoring devices are typically suitable for fixed boom mounting shafts. Examples include a marine crane luffing encoder transmission device (Chinese Patent Application No. CN201520665364.1) and a marine crane luffing encoder mounting mechanism (Chinese Patent Application No. CN202222273536.3), which disclose two types of luffing angle encoder mounting devices. Both are mounted on the cover plate of a fixed boom mounting shaft and are not suitable for rotating boom mounting shafts.

[0006] To solve the above problems, it is necessary to propose a boom luffing angle monitoring device for marine cranes with rotating boom mounting shafts, which can accurately measure the boom elevation angle and control the upper and lower limit angles of the boom luffing. Utility Model Content

[0007] The purpose of this invention is to propose a boom luffing angle monitoring device for marine cranes to solve the aforementioned problems. This device is applicable to rotating boom mounting shafts, accurately measures the boom elevation angle, assists the operator in real-time control of the boom luffing posture, and reduces the difficulty of boom luffing operation. Furthermore, it can control the upper and lower limit angles of the boom luffing, preventing the boom from exceeding its operating limits due to improper operation, thus improving the safety and reliability of the crane boom luffing.

[0008] To achieve the above objectives, the following technical solution is adopted: a boom luffing angle monitoring device for marine cranes, comprising a fixed component, one end of which is connected to an angle monitoring component, and the other end of which is fixed to the crane tower. A transmission component is driven to the rear end of the angle monitoring component. A limit switch unit is provided on the fixed component, and a sensing unit is provided on the transmission component. The switch unit sends a corresponding sensing signal based on whether the sensing unit is in contact with it, and monitors the luffing angle in real time through the angle monitoring component.

[0009] Preferably, the sensing unit includes an upper limit bracket and a lower limit bracket, which are located in different radial directions of the transmission assembly.

[0010] Preferably, the limit switch unit includes an upper limit limit switch and a lower limit limit switch, which are fixed together inside the fixing component.

[0011] Preferably, the transmission assembly includes a boom mounting shaft cover plate, which is located at the end of the boom mounting shaft and rotates synchronously with it. A transmission bracket is fixedly connected to the boom mounting shaft cover plate along the axial direction. The end of the transmission bracket away from the boom mounting shaft cover plate is connected to the angle monitoring assembly via a coupling. The upper limit bracket and the lower limit bracket are respectively fixed on the outside of the boom mounting shaft cover plate.

[0012] Preferably, the angle monitoring component is an angle encoder, which is provided with an encoder housing.

[0013] Preferably, the fixing component includes a base, a main bracket connected to the base, and an encoder mounting plate connected to the other end of the main bracket via an adjustment mechanism. The angle monitoring component is fixed on the encoder mounting plate.

[0014] Preferably, the adjustment mechanism includes a plurality of sliding holes provided on the main bracket and the encoder mounting plate. The sliding holes on the main bracket are perpendicular to each other and are fixed by adjusting bolts passing through the sliding holes on the main bracket and the encoder mounting plate in sequence, and are fixed by adjusting nuts.

[0015] Preferably, at least one sliding hole on the main support and at least one sliding hole on the encoder mounting plate are provided with a fine-tuning mechanism. The fine-tuning component includes a slider slidably connected to the sliding hole. One end of the slider is connected to the end of the sliding hole by a tension spring. The fixing component is provided with a guide hole. A guide rod is connected to the slider. One end of the guide rod passes through the tension spring and extends into the guide hole. The fixing component is provided with a fine-tuning threaded hole. A fine-tuning bolt is threadedly connected to the fine-tuning threaded hole. The other end of the fine-tuning bolt abuts against the slider. The slider is provided with a through hole for the adjusting bolt to pass through, so that the adjusting bolt passes through the through hole sequentially through the sliding hole on the main support and the sliding hole on the encoder mounting plate. The end faces of the adjusting bolt and the adjusting nut both act on the side of the two sliders that are far apart from each other.

[0016] This utility model also proposes a marine crane boom luffing angle monitoring system, including the above-mentioned luffing angle monitoring device, for real-time monitoring of boom luffing angle. The hull attitude module is used to detect the real-time angle between the hull and the horizontal plane; The control module is used to perform logical operations on the angle parameters collected by the luffing angle monitoring device and the hull attitude module, calculate the boom horizontal angle in real time, and determine whether the boom working radius is within the safe range based on the boom horizontal angle. The display module is used to display the angle parameters and the safe working radius of the boom obtained from the logical operations of the control module in real time.

[0017] Preferably, it also includes a luffing control module, which is used to issue a warning through the display module when the boom working radius obtained by the logical operation of the control module exceeds the maximum allowable range, and to restrict the luffing operation that increases the boom working radius.

[0018] The beneficial effects achieved by this utility model are as follows: Compared with existing technologies, the boom luffing angle monitoring device for marine cranes of this invention is suitable for rotating boom mounting shafts, can accurately measure the boom elevation angle, assists the operator in controlling the boom luffing posture in real time, and reduces the difficulty of boom luffing operation. Furthermore, it can control the upper and lower limit angles of the boom luffing, preventing the boom from exceeding its usage limits due to improper operation, thus improving the safety and reliability of the crane boom luffing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is an exploded structural diagram of the present invention.

[0021] Figure 3 This is a schematic diagram of the boom of this utility model in the lower limit state of the boom luffing.

[0022] Figure 4 This is a schematic diagram of the boom of this utility model in its upper limit position.

[0023] Figure 5 This is a schematic diagram of the fine-tuning mechanism of this utility model.

[0024] Figure 6 This is a schematic diagram of the main bracket and encoder mounting plate of this utility model in a locked state.

[0025] In the diagram, 1-Upper limit bracket, 2-Lower limit bracket, 3-Upper limit limit switch, 4-Lower limit limit switch, 5-Boom mounting shaft cover plate, 6-Transmission bracket, 7-Coupling, 8-Base, 9-Main bracket, 10-Encoder mounting plate, 11-Sliding hole, 12-Adjusting bolt, 13-Adjusting nut, 14-Slider, 15-Tension spring, 16-Guide hole, 17-Guide rod, 18-Fine adjustment threaded hole, 19-Fine adjustment bolt, 20-Locking threaded hole, 21-Locking bolt, A-Tower body, B-Boom, C-Fastener, M-Angle encoder, N-Encoder housing. Detailed Implementation

[0026] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", 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 utility model 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 utility model.

[0028] Please refer to Figure 1-6A boom luffing angle monitoring device for marine cranes includes a fixed assembly. One end of the fixed assembly is connected to an angle monitoring component, and the other end is fixed to the crane tower A. The rear end of the angle monitoring component is driven by a transmission assembly, which is connected to the boom B of the crane. The fixed assembly is equipped with a limit switch unit, and the transmission assembly is equipped with a sensing unit. The switch unit emits a corresponding sensing signal based on whether the sensing unit is in contact with it, and sends the sensing signal to the main control screen in the cab in a specific form (such as an indicator light or a prompt sound). At this time, the boom B's luffing lowering or luffing raising actions are prohibited, thereby assisting the operator in controlling the boom luffing posture of the crane in real time, reducing the difficulty of boom luffing operation, and controlling the upper and lower limit angles of the boom luffing, preventing the boom from exceeding the usage limits due to improper operation, and improving the safety and reliability of the boom luffing. At the same time, by monitoring the luffing angle in real time through the angle monitoring component, the boom elevation angle can be accurately measured and fed back to the main control screen in the cab in real time.

[0029] Specifically, the sensing unit includes an upper limit bracket 1 and a lower limit bracket 2, which are located in different radial directions of the transmission assembly. That is, the upper limit bracket 1 and the lower limit bracket 2 have different rotation radii and the line connecting them to the rotation axis has a predetermined angle.

[0030] Specifically, the limit switch unit includes an upper limit limit switch 3 and a lower limit limit switch 4, which are fixed together inside the fixed assembly. When the transmission assembly rotates at a predetermined angle, the upper limit bracket 1 and the lower limit bracket 2 can contact the probes of the upper limit limit switch 3 and the lower limit limit switch 4.

[0031] Specifically, the transmission assembly includes a boom mounting shaft cover plate 5, which is located at the end of the boom mounting shaft and rotates synchronously with it. A transmission bracket 6 is fixedly connected to the boom mounting shaft cover plate 5 along the axial direction. The end of the transmission bracket 6 away from the boom mounting shaft cover plate 5 is connected to the angle monitoring assembly via a coupling 7. The angle monitoring assembly is an angle encoder M, which is provided with an encoder cover N. The upper limit bracket 1 and the lower limit bracket 2 are respectively fixed on the outside of the boom mounting shaft cover plate 5.

[0032] When in use, taking the boom B initially in a horizontal resting state, i.e., the lower limit luffing position, as an example, please refer to the crane status at this time. Figure 3 : In the initial state, the lower limit bracket 2 on the boom mounting shaft cover plate 6 contacts the probe of the lower limit travel switch 4, and the luffing lower limit indicator light on the main control screen in the cab illuminates. At this time, the luffing lowering action is prohibited by the program, and the operator cannot control the crane to perform the luffing lowering action. When the operator controls the crane to perform the luffing raising operation, the luffing lifting begins, and the transmission bracket 6 begins to rotate around the boom mounting shaft as the boom B moves. When the probe of the lower limit travel switch 4 separates from the lower limit bracket 2, the luffing lower limit indicator light on the main control screen in the cab goes out. During the luffing process, the transmission bracket 6 drives the shaft of the angle encoder M to rotate through the coupling 7. The angle encoder M receives the signal and transmits the angle change to the main control screen in the cab.

[0033] When boom B reaches its maximum luffing angle, please refer to the crane status section. Figure 4 The upper limit bracket 1 on the boom mounting shaft cover plate 5 begins to contact the probe of the upper limit travel switch 3. The upper limit travel switch 3 sends a signal to the main control screen in the cab, and the luffing upper limit indicator light illuminates. At this time, the luffing raising action is prohibited by the program, and the luffing raising action stops.

[0034] When the operator controls the crane to perform a luffing and lowering operation, the luffing angle displayed on the main control screen decreases synchronously as the lowering action begins. When the upper limit support 1 disengages from the probe of the upper limit travel switch 3, the luffing upper limit indicator light on the main control screen goes out. When boom B luffs to the lower limit angle, please refer to the crane status at this time. Figure 3 When the lower limit bracket 2 on the boom mounting shaft cover plate 5 begins to contact the probe of the lower limit travel switch 4, the lower limit travel switch 8 sends a signal to the main control screen in the cab, and the luffing lower limit indicator light illuminates. At this time, the luffing lowering action is prohibited by the program, and the luffing lowering action stops.

[0035] In this embodiment, the fixing component includes a base 8, which is fixed to the tower body A of the crane by fasteners C, and a main support 9 connected to the base 8. The other end of the main support 9 is connected to an encoder mounting plate 10 through an adjustment mechanism, and the angle monitoring component is fixed on the encoder mounting plate 10.

[0036] In this embodiment, the adjustment mechanism includes a plurality of sliding holes 11 provided on the main support 9 and the encoder mounting plate 10. The sliding holes 11 on the main support 9 are perpendicular to each other and the sliding holes 11 on the encoder mounting plate 10 are perpendicular to each other. Adjusting bolts 12 pass through the sliding holes 11 on the main support 9 and the sliding holes 11 on the encoder mounting plate 10 in sequence and are fixed by adjusting nuts 13. By setting the sliding holes, the encoder mounting plate 10 is placed in a suitable position to ensure that the angle monitoring component, the transmission component and the boom mounting shaft are on the same axis.

[0037] Please refer to Figure 5 and Figure 6In this embodiment, as a preferred implementation of the above embodiments, since the main support 9 and the encoder mounting plate 10 are fixed by adjusting the adjusting bolt 12 and adjusting nut 13, after fixing, when the angle monitoring component, transmission component and boom mounting shaft are not on the same axis, it is necessary to loosen them again for adjustment, which is cumbersome and difficult to position. In order to reduce this step and at the same time ensure that the angle monitoring component, transmission component and boom mounting shaft are on the same axis, in this solution, at least one sliding hole 11 on the main support 9 and at least one sliding hole 11 on the encoder mounting plate 10 are provided with a fine adjustment mechanism. The fine adjustment component includes a slider 14 slidably connected to the sliding hole 11. One end of the slider 14 is connected to the end of the sliding hole 11 by a tension spring 15. The fixing component is provided with a guide hole 16. A guide rod 17 is connected to the slider 14. One end of the guide rod 17 passes through the tension spring 15 and extends into the guide hole 16. The fixing component is provided with a guide hole 16. A fine-tuning threaded hole 18 is provided, on which a fine-tuning bolt 19 is threadedly connected. The other end of the fine-tuning bolt 19 abuts against the slider. The slider 14 is provided with a through hole for the adjusting bolt 12 to pass through, so that the adjusting bolt 12 passes through the through hole in sequence through the sliding hole 11 located on the main bracket 9 and the sliding hole 11 located on the encoder mounting plate 10. The end faces of the adjusting bolt 12 and the adjusting nut 13 both act on the side of the two sliders 14 that are far apart from each other. When the angle monitoring component, the transmission component and the boom mounting shaft are not on the same axis, by rotating the fine-tuning bolt 19, it pushes the slider 14 to move, and the tension spring 15 is compressed. Since the end faces of the adjusting bolt 12 and the adjusting nut 13 both act on the side of the two sliders 14 that are far apart from each other, the encoder mounting plate 10 can move up and down relative to the main bracket 9, or the main bracket 9 can move left and right relative to the encoder mounting plate 10, until the angle monitoring component, the transmission component and the boom mounting shaft are on the same axis.

[0038] In this embodiment, as a preferred implementation of the above embodiments, a through locking threaded hole 20 is provided in the adjusting bolt 12, and a locking bolt 21 is threadedly connected in the locking threaded hole 20. The inner end face of the locking bolt 21 acts on the fixing component. Since the inner end face of the locking bolt 21 acts on the fixing component, that is, on the end faces of the encoder mounting plate 10 and the main bracket 9 that are far apart from each other, the angle encoder M, which has been adjusted by the fine-tuning component, can be limited, thereby ensuring that the angle encoder M, the transmission component and the boom mounting shaft are on the same axis, and ensuring the accuracy of monitoring.

[0039] This utility model also discloses a marine crane boom luffing angle monitoring system, including the above-mentioned luffing angle monitoring device, for real-time monitoring of boom luffing angle. The hull attitude module is used to detect the real-time angle between the hull and the horizontal plane; The control module is used to perform logical operations on the angle parameters collected by the luffing angle monitoring device and the hull attitude module, calculate the boom horizontal angle in real time, and determine whether the boom working radius is within the safe range based on the boom horizontal angle. The display module is used to display the angle parameters and the safe working radius of the boom obtained from the logical operations of the control module in real time.

[0040] It also includes a luffing control module, which issues a warning through the display module when the boom working radius, obtained from the logical operation of the control module, exceeds the maximum allowable range, and restricts luffing operations that increase the boom working radius.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A boom luffing angle monitoring device for a marine crane, comprising a fixing component, one end of which is connected to an angle monitoring component, and a transmission component being drivenly connected to the rear end of the angle monitoring component, characterized in that: The fixed component is equipped with a limit switch unit, and the transmission component is equipped with a sensing unit. The switch unit sends out a corresponding sensing signal according to whether the sensing unit is in contact with it, and the amplitude change angle is monitored in real time by the angle monitoring component.

2. A ship crane jib luffing angle monitoring device according to claim 1, characterized in that: The sensing unit includes an upper limit bracket (1) and a lower limit bracket (2), which are located in different radial directions of the transmission assembly.

3. A ship crane jib luffing angle monitoring device according to claim 2, characterized in that: The limit switch unit includes an upper limit limit switch (3) and a lower limit limit switch (4), which are fixed together inside the fixed component. When the transmission component rotates at a predetermined angle, the upper limit bracket (1) and the lower limit bracket (2) can contact the probes of the upper limit limit switch (3) and the lower limit limit switch (4).

4. A ship crane jib luffing angle monitoring device according to claim 3, characterized in that: The transmission assembly includes a boom mounting shaft cover plate (5), and a transmission bracket (6) is fixedly connected to the boom mounting shaft cover plate (5) along the axial direction. The end of the transmission bracket (6) away from the boom mounting shaft cover plate (5) is connected to the angle monitoring assembly through a coupling (7). The upper limit bracket (1) and the lower limit bracket (2) are respectively fixed on the outside of the boom mounting shaft cover plate (5).

5. The marine crane jib luffing angle monitoring device according to claim 1, characterized in that: The angle monitoring component is an angle encoder.

6. A ship crane jib luffing angle monitoring device according to claim 1, characterized in that: The fixing component includes a base (8) and a main bracket (9) connected to the base (8). The other end of the main bracket (9) is connected to an encoder mounting plate (10) through an adjustment mechanism. The angle monitoring component is fixed on the encoder mounting plate (10).

7. A ship crane jib luffing angle monitoring device according to claim 6, characterized in that: The adjustment mechanism includes several sliding holes (11) provided on the main bracket (9) and the encoder mounting plate (10). The sliding holes (11) on the main bracket (9) and the sliding holes (11) on the encoder mounting plate (10) are perpendicular to each other. The adjusting bolts (12) pass through the sliding holes (11) on the main bracket (9) and the sliding holes (11) on the encoder mounting plate (10) in sequence, and are fixed by adjusting nuts (13).

8. A ship crane jib luffing angle monitoring device according to claim 7, characterized in that: At least one sliding hole (11) on the main bracket (9) and at least one sliding hole (11) on the encoder mounting plate (10) are provided with a fine-tuning mechanism. The fine-tuning mechanism includes a slider (14) slidably connected to the sliding hole (11). One end of the slider (14) is connected to the end of the sliding hole (11) by a tension spring (15). The fixing assembly is provided with a guide hole (16). A guide rod (17) is connected to the slider (14). One end of the guide rod (17) passes through the tension spring (15) and extends into the guide hole (16). The fixed component is provided with a fine-tuning threaded hole (18), and a fine-tuning bolt (19) is threadedly connected to the fine-tuning threaded hole (18). The other end of the fine-tuning bolt (19) abuts against the slider. The slider (14) is provided with a through hole for the adjustment bolt (12) to pass through, so that the adjustment bolt (12) passes through the through hole in sequence through the sliding hole (11) on the main bracket (9) and the sliding hole (11) on the encoder mounting plate (10). The end faces of the adjustment bolt (12) and the adjustment nut (13) both act on the side of the two sliders (14) that are far apart from each other.

9. A marine crane jib luffing angle monitoring system, characterized by, Includes the luffing angle monitoring device according to any one of claims 1-8, used for real-time monitoring of the boom luffing angle; The hull attitude module is used to detect the real-time angle between the hull and the horizontal plane; The control module is used to perform logical operations on the angle parameters collected by the luffing angle monitoring device and the hull attitude module, calculate the boom horizontal angle in real time, and determine whether the boom working radius is within the safe range based on the boom horizontal angle. The display module is used to display the angle parameters and the safe working radius of the boom obtained from the logical operations of the control module in real time.

10. A ship crane jib luffing angle monitoring system according to claim 9, characterized in that: It also includes a luffing control module, which issues a warning through the display module when the boom working radius, obtained from the logical operation of the control module, exceeds the maximum allowable range, and restricts luffing operations that increase the boom working radius.

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