Marine large-scale annular crane

Abstract

The invention relates to a large-scale annular crane for a ship. The large-scale annular crane comprises a plurality of stand columns, an annular supporting structure, a cart system, a crane carriage and an electric control system, one end of the stand column is welded to a ship deck, the other end of the stand column is welded to the annular supporting structure, and an annular rail is arranged on the annular supporting structure. The cart system comprises a cart, and the cart rotates along the annular track; the crane trolley is arranged on the cart; and the electric control system is used for controlling the cart and the trolley. The large-scale annular crane is matched with a floating test platform for use, can realize underwater lifting of a conventional model, can also realize state control of model rotation and the like, and is suitable for tests of offshore offshore wharf water areas or other water area conditions.

Description

Technical Field

[0001] The invention relates to a ship crane, in particular to a ship large-scale ring crane. Background Art

[0002] At present, special lifting tasks in sea / water environments have brought challenges to the lifting control of ship cranes. However, existing ship cranes are mainly single-arm cranes, which are mainly used for lifting tasks. When performing certain scientific research tasks such as underwater lifting and rotation, conventional cranes cannot achieve their state control. Therefore, it is necessary to design a ship crane that can not only meet conventional lifting tasks, but also meet underwater 0-360° rotation control. Summary of the invention

[0003] The purpose of the present invention is to overcome the inability of the existing marine crane to achieve state control and provide a large-scale ring crane, which is used in conjunction with a floating test platform. In addition to being able to achieve the underwater placement of conventional models, it can also achieve state control such as model rotation. The present invention can be used for offshore near-shore dock waters or other water conditions tests.

[0004] The technical solution adopted to achieve the purpose of the present invention is a large-scale annular crane for ships, which includes multiple columns, an annular support structure, a trolley system, a lifting trolley and an electronic control system; one end of the column is welded to the hull deck, and the other end is welded to the annular support structure; an annular track is arranged on the annular support structure; the trolley system includes a trolley, and the trolley rotates along the annular track; the lifting trolley is arranged on the trolley; the electronic control system is used to control the trolley and the trolley.

[0005] In the above technical scheme, the trolley system also includes a main beam, an end beam, running wheels, a horizontal guide wheel, a pin wheel and pin tooth drive mechanism, a reducer and a brake; the main beam is a box beam structure, the upper cover plate of the main beam is provided with a trolley running track, car stops are installed at both ends of the main beam, and the upper cover plate of the main beam is installed with a rack of the trolley running drive mechanism near the outer web; the end beams are located at both ends of the trolley, are arc-shaped, and adopt a welded box beam structure, and the end beams and the main beams are connected with high-strength bolts; the running wheels are installed on the lower cover plate of the arc-shaped end beam of the trolley and are radially distributed along the circular track; the horizontal guide wheel is installed under the end beam; the pin wheel and pin tooth drive mechanism includes a pin wheel, a pin tooth rotation mechanism and a pin tooth transmission mechanism, the pin wheel is installed on the circular track beam, the pin tooth rotation mechanism is installed on the end beam, and the pin tooth transmission mechanism is two sets, which are symmetrically installed on the end beams at both ends.

[0006] Furthermore, the pin gear transmission mechanism is driven by a variable frequency motor; the reducer is a planetary reducer; the brake is a brake wheel and friction plate at the rear end of the motor, and the brake device is a normally closed type.

[0007] In the above technical solution, the lifting trolley includes a trolley frame, and a lifting and hoisting mechanism, a main lifting mechanism and a trolley traveling mechanism arranged on the trolley frame.

[0008] Furthermore, the main lifting mechanism includes a variable frequency motor, a hard-toothed parallel shaft reducer, a brake, an open gear rotation, a drum group, a wire rope, a hook movable pulley group and a fixed pulley group; the variable frequency motor adopts AC variable frequency speed regulation, the brake is a normally closed brake, the hook of the main lifting mechanism is provided with a height travel limit device, and the main lifting mechanism is also provided with a lifting load limiter.

[0009] Furthermore, the trolley travel mechanism includes a passive wheel group that provides travel support force for the trolley, a horizontal guide wheel for overcoming horizontal force when the ship is tilted, and a gear rack transmission mechanism that provides driving force for the trolley travel.

[0010] In the above technical scheme, the electric control system includes a power processing unit, a motor control unit, a PLC centralized control unit and a control unit; the motor control unit includes a motor starting box, which is used to start and stop the motors of the system; the PLC centralized control unit includes a PLC control box, which receives human-machine interface instructions, collects and monitors dynamic signals of system sensors and other detection elements, and processes and calculates them, and issues action instructions to realize independent and joint operations of mechanisms such as trolley travel, lifting, and truck travel; the control unit includes a centralized operating console and a human-machine interface, which are used to issue action instructions and safety alarm indications.

[0011] Furthermore, the motor control unit also includes upper and lower limit protection for the hook head, limit protection for large vehicle travel, limit protection for trolley travel, and an overload limiter.

[0012] Furthermore, the centralized operating console includes operating handles for various mechanisms, and the human-machine interface integrates a liquid crystal display, operating buttons, indicator lights and auxiliary function switches.

[0013] Furthermore, the electronic control system also includes a safety alarm unit, which includes an audible and visual alarm system and an alarm device, which performs emergency prompt alarms in the event of system overspeed, overload, or failure, and operates the audible and visual alarm system and voice prompts.

[0014] The present invention has the following advantages:

[0015] 1. This ring crane is used in conjunction with the test platform and is suitable for offshore docks or other water conditions, meeting the maximum roll of 5.0° and pitch of 2.0° operating environment conditions.

[0016] 2. This ring crane can realize single trolley main hook working alone, single trolley running working alone, single trolley main hook running linkage, and 1t winch working alone.

[0017] 3. This ring crane can realize the linkage of the main hook of the double trolley and the traveling linkage of the double trolley.

[0018] 4. This ring crane can realize the independent rotation of the trolley and achieve scientific research tasks such as 360° rotation control of underwater models. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of the large-scale ring crane of the present invention.

[0020] Figure 2 It is a side view of the large-scale ring crane of the present invention.

[0021] Figure 3 It is a top view of the large-scale ring crane of the present invention.

[0022] Figure 4 It is a structural schematic diagram of the large-scale ring crane of the present invention installed on a ship.

[0023] As shown in the figure: 1 is the lifting trolley, 2 is the trolley system, 3 is the annular supporting structure, and 4 is the column. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The ring crane of the present invention comprises a column 4, a ring support structure 3, a double-girder trolley system 2 that performs rotational motion on a ring track, two 30t lifting trolley systems 1, an electric control system, etc. The following describes each part in detail:

[0026] (1) Column

[0027] The columns are steel tube cylindrical structures. and It is made of steel pipe with material of Q355C. In order to facilitate disassembly and installation, the column structure used in this embodiment is divided into three sections. The top section is welded to the annular support structure, the bottom section is welded to the hull deck, and a flange is provided between the middle section and the upper and lower sections, which are connected with high-strength bolts.

[0028] (2) Ring support structure

[0029] The annular support structure is a box beam structure, which is welded with Q355C steel plates. In order to facilitate disassembly and installation, the present embodiment divides the annular track beam into 4 sections along the circumference, and flanges are provided between each section, which are connected with high-strength bolts.

[0030] A circular track and a pin gear ring for trolley travel are arranged on the circular track beam. The diameter of the circular track in this embodiment is 15.4m, thus forming a large-scale ring.

[0031] (3) Carriage system

[0032] The trolley of the circular crane is mainly composed of the main beam, end beam, trolley running wheel, trolley horizontal guide wheel, running wheel pin wheel pin gear drive mechanism and other parts. It can rotate 360° along the circular track. The structure of each component is as follows:

[0033] 1. Main beam

[0034] The main beam of the ring crane is a box beam structure, with a center distance of 3.78m, a beam height of 1.16m, a beam width of 0.55m, and is welded with steel plates made of Q355C. The total length of the main beam is 15.3m. The two main beams are connected by welded I-shaped cross beams.

[0035] The upper cover of the main beam is equipped with a trolley track, the track model is P38. The two ends of the main beam are equipped with car stops, and the upper cover of the main beam is equipped with a rack of the trolley driving mechanism near the outer web. The car stops, tracks and racks are all connected to the main beam with bolts.

[0036] 2. End beam

[0037] The trolley of the ring crane adopts arc-shaped end beams at both ends, and the main beam and the end beams are connected with high-strength bolts; the arc-shaped end beam adopts a welded box beam structure and the material is Q355C.

[0038] 3. Trolley running wheels

[0039] The running wheels of the crane trolley are passive running wheels, with a total of 4 running wheels, which are respectively installed on the lower cover plate of the arc-shaped end beam of the crane trolley. The running wheels are radially distributed along the circular track, and the tread diameter of the running wheels is The material is forged from 42CrMo and quenched and tempered.

[0040] 4. Horizontal guide wheel of the trolley

[0041] There are also 4 sets of horizontal guide wheels on the crane trolley, which are installed under the arc-shaped end beams of the crane trolley to overcome the radial force of the crane trolley's circular operation and the horizontal force when the ship is tilted. The diameter of the guide wheel is The material is forged from 45# steel and tempered.

[0042] 5. Trolley pin wheel pin gear drive mechanism

[0043] The trolley operation mode of the circular crane is a pin wheel and pin tooth drive mechanism. The pin wheel is installed on the circular track beam, and the pin tooth rotation mechanism is installed on the trolley end beam. There are two sets of pin tooth transmission mechanisms, which are symmetrically installed on the end beams at both ends. The pin tooth transmission mechanism is driven by a variable frequency motor, and the reducer is a planetary reducer. The brake is a brake wheel and friction plate at the rear end of the motor, and the braking device is a normally closed type.

[0044] (4) Lifting trolley

[0045] The ring crane is equipped with two 30t lifting trolleys, which can run on the main beam of the trolley with a travel speed of 0.15-1.5m / min. The trolley includes a trolley frame, a lifting winch mechanism, a running wheel and a gear rack running mechanism installed on the trolley frame, and is powered by a cable drag chain. The lifting trolley is equipped with horizontal guide wheels to overcome the horizontal force when the ship is tilted. The lifting trolley is equipped with a 30t main lifting mechanism with a rated lifting capacity of 30t and is driven by a variable frequency motor. The lifting trolley is equipped with two sets of braking systems. Among them:

[0046] 1. 30t main lifting mechanism

[0047] The main lifting mechanism of the ring crane has a rated lifting capacity of 30t and a rated lifting speed of 0.7m / min, with two sets in total; the main lifting mechanism is mainly composed of a frequency conversion motor, a hard-toothed parallel shaft reducer, a brake, an open gear transmission, a drum group, a wire rope, a hook movable pulley group and a fixed pulley group.

[0048] All brakes are normally closed. In case of accidents such as drum overspeed or abnormal power failure, all brakes will be applied immediately.

[0049] The main lifting speed adopts AC frequency conversion speed regulation, which can achieve constant power rapid lifting when the hook is empty and lightly loaded.

[0050] The hooks of the main lifting mechanism are respectively provided with height travel limit devices, and the speed is automatically limited when approaching the limit travel position.

[0051] The main lifting mechanism is equipped with a lifting load limiter with an error less than 5% of the rated load.

[0052] 2. Trolley travel mechanism

[0053] The span of the hoisting trolley is 3.85m, the wheelbase is 2.5m, and the running speed is 0.15-1.5m / min. The running mechanism is mainly composed of a passive wheel group, a horizontal guide wheel combined with a rack and pinion transmission mechanism. The wheel group provides support for the trolley during running, the horizontal guide wheel is mainly used to overcome the horizontal force when the ship is tilted, and the rack and pinion running mechanism provides driving force for the trolley to run.

[0054] (4) Electronic control system

[0055] The control system consists of a power processing unit, a motor control unit, a PLC centralized control unit, an operating unit, a safety alarm unit, and a lighting unit. It adopts remote control and wire control methods and a 36V low-voltage control button device to operate the trolley operation, lifting, lowering and trolley operation. The protection cabinet, start button, and lifting and trolley operation switches are operated in the air. The trolley operation controller cuts the resistor to complete the speed regulation of the trolley operation speed.

[0056] 1. Power Processing Unit

[0057] The power processing unit realizes the power connection and signal transmission between the special crane and the ship during the operation of the equipment, which is the basic guarantee for the smooth and continuous operation of the special crane. The power supply of the whole system is three-phase AC 380V / 50Hz, the control circuit power supply is 36V / 50Hz, and the power feeding adopts safe copper busbar; the closing procedure of the contactor is controlled by the ground button control. The power distribution is provided by the crane control protection box and the electric hoist control box, which consists of a main circuit breaker, a main power contactor, an overcurrent relay and automatic switches of various mechanisms, so that the branch with fault can be disconnected for maintenance without affecting the operation of other branches, which is convenient for maintenance.

[0058] 2. Motor control unit

[0059] The motor control unit is mainly composed of a motor starter box, which realizes the start and stop functions of each motor in the system. The small electric hoist and trolley are operated by cable transmission, and galvanized steel wire is used for mobile cable. The threading tube on the bridge is equipped with a wire protection nozzle. All cables and wires of the crane are copper core cables, and the cross-sectional area of ​​the control circuit wire is not less than 1.5mm 2 The trolley is equipped with a limit switch to disconnect the control circuit when it reaches the limit position. The mechanism can only be operated in the opposite direction. The upper and lower limit protections of the hook, the trolley travel limit protection, the trolley travel limit protection, the overload limiter and other protections required by the crane are also designed.

[0060] 3. PLC centralized control unit

[0061] The PLC centralized control unit is mainly composed of a PLC control box. It receives commands from the human-machine interface, collects and monitors dynamic signals from system sensors and other detection components, processes and calculates them, issues action commands, and realizes independent and joint operations of trolley travel, lifting, and truck travel, and performs safety alarms and protection. A lifting weight display screen is set up to display the weight of the lifting object.

[0062] 4. Control unit

[0063] The control unit is mainly composed of a centralized operating console and a human-machine interface, which are used to issue action instructions and safety alarm indications. The centralized operating console integrates the operating handles of each mechanism, and the human-machine interface integrates a liquid crystal display, operating buttons, indicator lights, and auxiliary function switches.

[0064] 5. Security alarm unit

[0065] The safety alarm unit consists of an audible and visual alarm system and an alarm bell device, which will give an emergency warning alarm in the event of overspeed, overload or failure of the system. It has an audible and visual alarm system and voice prompt function.

Claims

1. A large-scale marine ring crane, characterized in that: It includes multiple columns, an annular support structure, a trolley system, a lifting trolley and an electric control system; one end of the column is welded to the hull deck, and the other end is welded to the annular support structure; a circular track is arranged on the annular support structure; the trolley system includes a trolley, and the trolley rotates along the circular track; the lifting trolley is arranged on the trolley; the electric control system is used to control the trolley and the trolley.

2. The large-scale marine ring crane according to claim 1, characterized in that: The trolley system also includes a main beam, an end beam, running wheels, a horizontal guide wheel, a pin wheel and pin tooth drive mechanism, a reducer and a brake; the main beam is a box beam structure, the upper cover plate of the main beam is provided with a trolley running track, car stops are installed at both ends of the main beam, and the upper cover plate of the main beam is installed with a rack of the trolley running drive mechanism near the outer web; the end beams are located at both ends of the trolley, are arc-shaped, and adopt a welded box beam structure, and the end beams and the main beams are connected with high-strength bolts; the running wheels are installed on the lower cover plate of the arc-shaped end beam of the trolley and are radially distributed along the circular track; the horizontal guide wheels are installed under the end beams; the pin wheel and pin tooth drive mechanism includes a pin wheel, a pin tooth rotation mechanism and a pin tooth transmission mechanism, the pin wheel is installed on the circular track beam, the pin tooth rotation mechanism is installed on the end beam, and the pin tooth transmission mechanism is two sets, which are symmetrically installed on the end beams at both ends.

3. The large-scale ring crane for ship according to claim 2, characterized in that: The pin gear transmission mechanism is driven by a variable frequency motor; the reducer is a planetary reducer; the brake is a brake wheel and a friction plate at the rear end of the motor, and the brake device is a normally closed type.

4. The large-scale ring crane for ship according to claim 1, characterized in that: The lifting trolley comprises a trolley frame, and a lifting and hoisting mechanism, a main lifting mechanism and a trolley traveling mechanism arranged on the trolley frame.

5. The large-scale marine ring crane according to claim 4, characterized in that: The main lifting mechanism includes a variable frequency motor, a hard-toothed parallel shaft reducer, a brake, an open gear rotation, a drum group, a wire rope, a hook movable pulley group and a fixed pulley group; the variable frequency motor adopts AC variable frequency speed regulation, the brake is a normally closed brake, the hook of the main lifting mechanism is provided with a height travel limit device, and the main lifting mechanism is also provided with a lifting load limiter.

6. The large-scale marine ring crane according to claim 5, characterized in that: The trolley travel mechanism includes a passive wheel group that provides travel support force for the trolley, a horizontal guide wheel for overcoming the horizontal force when the ship is tilted, and a gear rack transmission mechanism that provides driving force for the trolley to travel.

7. The large-scale marine ring crane according to any one of claims 1 to 6, characterized in that: The electric control system includes a power processing unit, a motor control unit, a PLC centralized control unit and a control unit; the motor control unit includes a motor start box, which is used to start and stop the motors of the system; the PLC centralized control unit includes a PLC control box, which receives human-machine interface instructions, collects and monitors dynamic signals of system sensors and other detection elements, processes and calculates them, and issues action instructions to realize independent and joint operations of mechanisms such as trolley travel, lifting, and truck travel; the control unit includes a centralized operating console and a human-machine interface, which are used to issue action instructions and safety alarm indications.

8. The large-scale ring crane for ship according to claim 7, characterized in that: The motor control unit also includes upper and lower limit protection for the hook head, limit protection for the travel of the trolley, limit protection for the travel of the trolley, and an overload limiter.

9. The large-scale ring crane for ship according to claim 8, characterized in that: The centralized operating console includes operating handles for various mechanisms, and the human-machine interface integrates a liquid crystal display, operating buttons, indicator lights and auxiliary function switches.

10. The large-scale marine ring crane according to claim 9, characterized in that: The electronic control system also includes a safety alarm unit, which includes an audible and visual alarm system and an alarm device. In the event of system overspeed, overload, or failure, an emergency alarm is issued, and the audible and visual alarm system and voice prompt are operated.

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