Electric hydraulic folding telescopic crane system for ships

Abstract

The present invention discloses an electric hydraulic folding telescopic crane system for ships, comprising a slewing system and a telescopic folding arm system; the slewing system comprises a rotating tower body arranged on a fixed base; the boom assembly of the telescopic folding arm system is rotatably arranged on the top of the rotating tower body, and the telescopic folding arm system comprises a folding arm; the boom assembly is connected to one end of the folding arm by power transmission; a plurality of folding arms are embedded and arranged in series on the other end of the folding arm, and the plurality of folding arms can be telescopically arranged through the boom assembly; a lifting system is respectively arranged at the bottom of the plurality of folding arms, and the lifting ropes of the lifting winches on the boom assembly are respectively connected to the lifting system. The present invention provides an electric hydraulic folding telescopic crane system for ships, the lifting arm of which can be quickly stored and folded, thereby reducing the effect of occupying space.

Description

Technical Field

[0001] The invention relates to the field of ship lifting. Background Art

[0002] Water transport plays an important role in cargo transportation. Generally, a hull is needed for water transportation. Therefore, a crane is installed on the hull. Using a crane to lift the cargo onto the hull will greatly save the difficulty of manpower handling, thereby avoiding waste of labor and saving the cost of transportation. The crane on the hull is generally large, so it is necessary to design a foldable crane to reduce the space occupied by the lifting arm. A left-handed crane is specially designed to increase the storage space for cargo and facilitate the transportation of large quantities of cargo. This product meets the latest specifications of classification societies and is mainly used for lifting daily necessities and ship supplies for ships. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a lifting arm of an electric hydraulic folding and telescopic crane system for ships that can be quickly folded and stored to reduce the space occupied.

[0004] Technical solution: To achieve the above purpose, the technical solution of the present invention is as follows:

[0005] An electric hydraulic folding and telescopic crane system for ships comprises a slewing system and a telescopic folding arm system; the slewing system comprises a rotating tower body arranged on a fixed base; the boom assembly of the telescopic folding arm system is rotatably arranged on the top of the rotating tower body, and the telescopic folding arm system comprises a folding arm; the boom assembly is connected to one end of the folding arm by power transmission; a plurality of folding arms are embedded and arranged in series on the other end of the folding arm, and the plurality of folding arms are telescopically arranged through the boom assembly; a lifting system is respectively arranged at the bottom of the plurality of folding arms, and the lifting ropes of the lifting winches on the boom assembly are respectively connected to the lifting system.

[0006] Furthermore, it also includes a cab; the cab is arranged on the rotating tower body and moves synchronously with the rotating tower body; the cab is arranged at a distance from the ground through a platform ladder; the boom assembly is arranged close to the cab, and the cab is arranged on one side of the lifting system.

[0007] Furthermore, it also includes a hydraulic pump station; the hydraulic pump station is respectively connected to the rotating tower body and the boom assembly through a hydraulic system.

[0008] Furthermore, the rotating tower body includes a rotating platform; the rotating device at the top of the fixed base is drivingly connected to the bottom of the rotating platform; a convex block is provided at the bottom of one side edge of the rotating platform; a slewing limit block is rotatably provided at one side of the top of the fixed base; the slewing limit block corresponds to the convex limit setting;

[0009] A protruding plate is fixedly provided on one side wall of the rotary limit block corresponding to the protrusion; a rebound limit arc plate is symmetrically fixedly provided on the top and bottom of one end of the protruding plate away from the protrusion; the cross-section of the rebound limit arc plate is arc-shaped, and the rebound limit arc plate is bent upward in the direction of the protrusion away from the protruding plate; a collision block is fixedly provided on the side wall of the rotary limit block; adjustment plates are symmetrically provided on the top and bottom of the collision block; the driving device on the collision block is drivingly connected to the corresponding end of the adjusting plate; the end of the adjusting plate away from the collision block is bent downward in the direction of the collision block, and the shape is hooked shape, and the end of the hook shape is an elastic hook point; a limit slot is formed between the upper and lower symmetrical hooks; the rebound limit arc plate is correspondingly clamped in the limit slot; the rebound limit arc plate and the opposite end of the collision block are magnetic structures respectively; when the protrusion rotates to one side, the adjustment plate drives the symmetrical elastic hook points away from each other, and the rebound limit arc plate escapes from the limit slot; when the protrusion rotates, the adjustment plate drives the elastic hook points to approach each other, and the rebound limit arc plate pushes the elastic hook point open and embeds it into the limit slot, and the hook shape is limited to the rebound limit arc plate.

[0010] Furthermore, the boom assembly includes a fixed support plate and a connecting square plate; the bottom end of the fixed support plate is fixed on the rotating platform; the top end of the fixed support plate is tilted upward away from the lifting system, and the top end of the fixed support plate is rotatably connected to one end of the connecting square plate; the angle between the connecting square plate and the fixed support plate is an acute angle;

[0011] A matching block is provided on the bottom protrusion of one end of the connecting square plate close to the fixed support plate; the hydraulic system includes a variable amplitude cylinder; the variable amplitude cylinder is arranged on a rotating platform, and the driving end of the variable amplitude cylinder is drivingly connected to the matching block; the variable amplitude cylinder drives the connecting square plate to swing through the matching block to adjust the angle between the connecting square plate and the fixed support plate.

[0012] Furthermore, a crossbeam plate is staggeredly arranged in the rotational connection at one end of the connecting square plate away from the fixed supporting plate; a folding arm is correspondingly arranged on the end of the crossbeam plate away from the connecting square plate; a connecting plate is arranged on the bottom protrusion of one end of the crossbeam plate corresponding to the connecting square plate; a rotation bar is arranged at intervals on one side of the crossbeam plate; the two ends of the rotation bar are respectively connected to the top of the crossbeam plate and the connecting plate through connecting rods to form a rectangular frame; the connecting square plate is correspondingly rotated in the rectangular frame; a folding arm cylinder is arranged at the bottom of the connecting square plate near the matching block; the driving end of the folding arm cylinder is correspondingly connected to the driving bottom of the rectangular frame, and then drives the folding arm to rotate through the crossbeam plate.

[0013] Furthermore, the folding arm includes a telescopic tube; a plurality of the telescopic tubes are arranged in sequence toward one end away from the cross-beam plate, and the cross-sectional area of ​​the telescopic tubes away from the cross-beam plate gradually decreases, and the telescopic tubes away from the cross-beam plate are sequentially embedded in the telescopic tubes close to the cross-beam plate; the hydraulic cylinder on the cross-beam plate is correspondingly driven and connected to a plurality of telescopic tubes; triangular plates are respectively fixed on the side walls of one end of the telescopic tubes away from the cross-beam plate; the telescopic movement of a plurality of the telescopic tubes correspondingly drives a plurality of triangular plates to be close together and overlapped.

[0014] Furthermore, the lifting system includes a hook; a pulley is detachably provided at the bottom of the triangular plate; a lifting winch is fixedly provided at the bottom of the crossbeam plate; the lifting rope of the lifting winch is correspondingly arranged on the pulley at one end away from the lifting winch, and is wound on the hook, thereby driving the hook to lift up and down.

[0015] Furthermore, a lifting limit block is provided at the bottom of the pulley; a movable hole is opened through the middle of the lifting limit block; one end of the lifting rope winding hook corresponds to the movable hole; when the hook rises to the position, the lifting limit block is correspondingly limited to the hook.

[0016] Beneficial effects: When the present invention is not used for lifting cargo, the folding arm can be quickly folded up to avoid occupying space; including but not limited to the following beneficial effects:

[0017] 1) The crane needs to be limited by the cooperation of the convex block and the slewing limit block, so as to ensure that the crane can slew quickly. At the same time, it can also play a role in positioning the crane, so that the crane can slew to the initial position, and then lift the goods;

[0018] 2) The hydraulic cylinder drives the telescopic tube to extend and retract, thereby controlling the extension and retraction of the folding arm, and then driving the lifting system to move to the position of the cargo to lift the cargo. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 This is the structural diagram of the crane system;

[0020] Attached Figure 2 It is the structural diagram of the telescopic folding arm system;

[0021] Attached Figure 3 This is a structural diagram of the limit slot;

[0022] Attached Figure 4 This is the structural diagram of the hydraulic pump station;

[0023] Attached Figure 5 This is the structural diagram of the beam plate;

[0024] Attached Figure 6 This is a structural diagram of the folding arm;

[0025] Attached Figure 7 It is a schematic diagram of the tightening method;

[0026] Attached Figure 8 This is a diagram for setting the tightening torque. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] As attached Figure 1-8 : The electric hydraulic folding telescopic crane system for ships comprises a slewing system 1 and a telescopic folding arm system 2; the slewing system 1 comprises a rotating tower body 12 arranged on a fixed base 11; the boom assembly 21 of the telescopic folding arm system 2 is rotatably arranged on the top of the rotating tower body 12, and the telescopic folding arm system 2 comprises a folding arm 6; the boom assembly 21 is connected to one end of the folding arm 6 by power transmission; a plurality of folding arms 6 are embedded and arranged in series on the other end of the folding arm 6, and a plurality of the folding arms 6 are telescopically arranged through the boom assembly 21; a lifting system 3 is respectively arranged at the bottom of a plurality of the folding arms 6, and a lifting rope 211 of a lifting winch 212 on the boom assembly 21 is respectively connected to the lifting system 3. The lifting rope of the lifting winch lifts the cargo through the lifting system, and then the slewing system drives the folding arm to rotate through the boom assembly, and then the cargo can be lifted and transferred to other positions, thereby lifting the cargo onto the ship and saving labor.

[0029] The crane also includes a cab 4; the cab 4 is arranged on the rotating tower body 12 and moves synchronously with the rotating tower body 12; the cab 4 is arranged at a distance from the ground through a platform ladder; the boom assembly 21 is arranged close to the cab 4, and the cab 4 is arranged on one side of the lifting system 3. The operator can control the movement of the folding arm by operating the boom assembly in the cab, thereby driving the movement of the cargo.

[0030] It also includes a hydraulic pump station 5, which is respectively connected to the rotating tower body 12 and the boom assembly 21 through a hydraulic system. The hydraulic system of the hydraulic pump station provides power for the rotating tower body and the boom assembly.

[0031] The rotating tower body 12 includes a rotating platform 121; the rotating device at the top of the fixed base 11 is drivingly connected to the bottom of the rotating platform 121; a protrusion 122 is provided at the bottom of one side edge of the rotating platform 121; a slewing limit block 111 is rotatably provided at one side of the top of the fixed base 11; the slewing limit block 111 is provided corresponding to the limit setting of the protrusion 122. After the crane drives the goods to the place for unloading, it needs to rotate and lift another batch of goods. When rotating to the initial position, the crane needs to be limited by the cooperation of the protrusion and the slewing limit block, thereby ensuring that the crane can rotate faster, and at the same time, it can also play a role in positioning the crane, prompting the crane to rotate to the initial position, and then lift the goods.

[0032] A protruding plate 123 is fixedly arranged on one side wall of the slewing limit block 111 corresponding to the protruding block 122; a rebound limit arc plate 124 is symmetrically fixedly arranged on the top and bottom of one end of the protruding plate 123 away from the protruding block 122; the rebound limit arc plate 124 has an arc-shaped cross section, and the rebound limit arc plate 124 is bent upward in the direction of the protruding block 122 on the side away from the protruding plate 123; a counter block 112 is fixedly arranged on the side wall of the slewing limit block 111; the counter block 1 The top and bottom of the collision block 112 are symmetrically provided with adjustment plates 113; the driving device on the collision block 112 is connected to the corresponding end of the adjustment plate 113; the adjustment plate 113 is bent downward in the direction of the collision block 112 away from the collision block 112, and has a hook shape, and the end of the hook is an elastic hook point 115, which is an elastic structure; a limit slot 116 is formed between the upper and lower symmetrical hooks; the rebound limit arc plate 124 is correspondingly clamped on the limit The spring-limiting arc plate 124 and the collision block 112 have magnetic structures at opposite ends respectively; when the protrusion 122 rotates to one side, the adjusting plate 113 drives the symmetrical elastic hook points 115 to move away from each other, and the spring-limiting arc plate 124 escapes from the limiting slot 116; in this way, the rotating platform can drive the folding arm to rotate, and then drive the cargo transfer; when the protrusion 122 rotates, the adjusting plate 113 drives the elastic hook points 115 to move closer to each other, and the spring-limiting arc plate 124 pushes the elastic hook points 115 to be embedded in the limiting slot 116, and the hook is limited to the spring-limiting arc plate 124; when the protruding plate rotates into place, it first collides with the collision block, and then will be bounced in the opposite direction, and in the process of rebounding, the spring-limiting arc plate collides with the hook-shaped interior accordingly, thereby slowing down the degree of rebound of the protrusion, avoiding the violent shaking of the folding arm caused by excessive rebound of the protrusion, and posing a safety hazard, thereby ensuring safety.

[0033] The boom assembly 21 includes a fixed support plate 22 and a connecting square plate 23; the bottom end of the fixed support plate 22 is fixed on the rotating platform 121; the top end of the fixed support plate 22 is tilted upward away from the lifting system 3, and the top end of the fixed support plate 22 is rotatably connected to one end of the connecting square plate 23; the angle between the connecting square plate 23 and the fixed support plate 22 is an acute angle; the bottom protrusion of the connecting square plate 23 near one end of the fixed support plate 22 is provided with a matching block 231; the hydraulic system includes a variable amplitude cylinder 51; the variable amplitude cylinder 51 is arranged on the rotating platform 121, and the driving end of the variable amplitude cylinder 51 is drivingly connected to the matching block 231; the variable amplitude cylinder 51 drives the connecting square plate 23 to swing through the matching block 231 to adjust the angle between the connecting square plate 23 and the fixed support plate 22. The variable amplitude oil cylinder drives the matching plate to drive the connecting square plate to move up and down, causing the connecting square plate to swing up and down away from one end of the fixed support plate, thereby driving the connecting square plate and the folding arm connected by the crossbeam plate to swing, thereby increasing the storage capacity.

[0034] The connecting square plate 23 is staggered with a crossbeam plate 24 for rotational connection at one end away from the fixed support plate 22; the crossbeam plate 24 is correspondingly provided with a folding arm 6 on one end away from the connecting square plate 23; the crossbeam plate 24 is provided with a connecting plate 241 at the bottom protrusion corresponding to one end of the connecting square plate 23; a rotation bar 242 is arranged at intervals on one side of the crossbeam plate 24; the two ends of the rotation bar 242 are respectively connected to the top of the crossbeam plate 24 and the connecting plate 241 through a connecting rod to form a rectangular frame; the connecting square plate 23 is correspondingly rotated in the rectangular frame; a folding arm oil cylinder 52 is arranged at the bottom of the connecting square plate 23 near the matching block 231; the driving end of the folding arm oil cylinder 52 is correspondingly connected to the bottom of the rectangular frame, and then drives the folding arm 6 to rotate through the crossbeam plate 24. The variable amplitude oil cylinder drives the rotation and folding through the connecting square plate, and the folding arm oil cylinder drives the folding arm to fold through the crossbeam plate, so that the folding arm can be folded and stored, avoiding the folding arm from occupying excess space.

[0035] The folding arm 6 includes a telescopic tube 61; a plurality of the telescopic tubes 61 are arranged in sequence toward the end away from the cross beam plate 24, and the cross-sectional area of ​​the telescopic tubes 61 away from the cross beam plate 24 gradually decreases, and the telescopic tubes 61 away from the cross beam plate 24 are sequentially embedded in the telescopic tubes 61 near the cross beam plate 24; the hydraulic cylinder on the cross beam plate 24 is correspondingly connected to the telescopic tubes 61; triangular plates 62 are fixed on the side walls of the ends of the telescopic tubes 61 away from the cross beam plate 24; the telescopic tubes 61 are extended and retracted to drive the triangular plates 62 to be close and overlapped. The hydraulic cylinder drives the telescopic tube to extend and retract, thereby controlling the extension and retraction of the folding arm, and then driving the lifting system to move to the position of the cargo to lift the cargo.

[0036] The lifting system 3 includes a hook 31; a pulley 63 is detachably provided at the bottom of the triangular plate 62; a lifting winch 212 is fixedly provided at the bottom of the crossbeam plate 24; a lifting rope 211 of the lifting winch 212 is correspondingly provided on the pulley 63 at one end away from the lifting winch 212, and is wound on the hook 31, thereby driving the hook 64 to lift up and down. The lifting winch is controlled to drive the corresponding hooks to lift the goods through multiple lifting ropes, thereby lifting multiple goods at the same time, improving work efficiency and facilitating storage.

[0037] A lifting limit block 631 is provided at the bottom of the pulley 63; a movable hole 632 is formed in the middle of the lifting limit block 631; one end of the lifting rope 211 wound around the hook 31 passes through the movable hole 532; when the hook 31 rises to the right position, the lifting limit block 631 is correspondingly limited to the hook 31. When the cargo is lifted to the right position, the lifting limit block will correspondingly limit the up and down movement of the hook, thereby limiting the cargo from continuing to move upward to ensure safety.

[0038] 1. This product meets the latest specifications of classification societies;

[0039] (1) The ship’s heel is ≤50° and its trim is ≤20°;

[0040] (2) Operations within the port;

[0041] (3) Wind speed ≤ 20 m / s, corresponding wind pressure ≤ 250 Pa;

[0042] (4) Ambient temperature: -10℃~45℃.

[0043] 2. Main technical features

[0044] Safe working load SWL;

[0045] Maximum working radius: 15.5m;

[0046] Minimum working radius: 2m;

[0047] Lifting speed: 0~10m / min;

[0048] Lifting height: 20m;

[0049] Amplitude change time: e: ~90S;

[0050] Rotation speed: 0~0.5r / min;

[0051] Rotation angle: ≤360°(Limited);

[0052] Working conditions: list ≤ 5°, trim ≤ 2°;

[0053] Hydraulic pump station motor power: 55KW, IP56;

[0054] Power supply: AC380V, 50Hz;

[0055] Control voltage: AC220V / DC24V;

[0056] This crane is equipped with a cab.

[0057] 3. Equipment installation

[0058] The equipment installation must be carried out strictly in accordance with the technical requirements of the mechanical, hydraulic and electrical drawings provided. The user requires the hull strength at the installation crane to withstand a vertical force of 254KN and a capsizing moment of 1080KNm, and its strength must meet the requirements. The equipment can only be used after it is correctly installed, prepared and tested before use.

[0059] 4. Equipment use

[0060] (1) Preparation before use

[0061] After the equipment is installed, check the hydraulic oil (ISO VG46) in the ship's pump station. The recommended filling volume is about 500L.

[0062] Each lubrication point should be filled with calcium-based grease.

[0063] (2) Usage

[0064] This crane cab operation:

[0065] Step 1: Open the electric control box and turn on the power switch;

[0066] Step 2: Start the pump station motor;

[0067] Step 3: Operate the equipment on the operating table as needed to rotate, hoist, luff, fold the arm, and extend and retract; when the folded arm is perpendicular to the deck, the operator should return the handle to the middle position;

[0068] Step 4: After the operation is completed, press the stop button to cut off the power supply.

[0069] Note: (1) Before working, change the boom height first and then operate the folding arm.

[0070] (2) When the crane is not in use, operate the luffing cylinder to adjust the boom to a certain angle, operate the winch to retract the wire rope, retract the full telescopic cylinder, retract the folding arm cylinder, and then retract the luffing cylinder and return it to the storage position.

[0071] 5. Daily maintenance

[0072] (1) In daily use, users should add calcium-based grease to the lubrication points provided; add grease before use after each voyage or once a month;

[0073] (2) The wire rope should be coated with grease and should not be used without oil. The wire rope should be checked at any time. When the wire breakage reaches 5% or the outer wire wear reaches 40%, it must be replaced.

[0074] (3) Hydraulic oil should be replaced every 12 to 18 months;

[0075] (4) Slewing bearing bolts;

[0076] It is very important to tighten the slewing bearing bolts again. This manual recommends that after the crane has been used for 50 hours under rated load conditions, it is necessary to tighten the slewing bearing bolts again. The tightening torque must reach the tightening torque of the bolts each time (see the tightening torque for details). Figure 8 ); In addition, it is necessary to check the slewing bearing bolts regularly (every 200 working hours).

[0077] Tightening method: Tightening the bolts should be carried out continuously and symmetrically in the 180 direction, and finally pass through once to ensure that the bolts on the circumference have the same pre-tightening force; use tools such as wrenches to tighten the tightening bolts according to Figure 7 Tighten the tightening positions on the cam, and the tightening steps are: step one, 1-2-3-4; step two, 5-6; step three, 7-8; step four, 9-10-11-12; step five, 13-14-15-16; and then tighten the tightening bolts.

[0078] 6. Security protection

[0079] (1) When the equipment is lifting overweight cargo, the hydraulic system's overflow valve can effectively protect the crane from overloading;

[0080] Note: The system overflow valve has been adjusted before leaving the factory, so non-professionals should not adjust it;

[0081] (2) This crane is equipped with a lifting limit device, which can automatically cut off the oil circuit when the hook reaches the head of the boom to play a protective role;

[0082] (3) This crane has a slewing limit. When the limit is reached, the slewing stops automatically and can slew in the reverse direction.

[0083] (4) The folding arm cylinder is equipped with a two-way balancing valve to prevent the arm from falling freely; the luffing cylinder is equipped with a one-way balancing valve, and the slewing cylinder is equipped with a two-way balancing valve;

[0084] (5) An emergency stop button is installed next to the operating console. Press this button when the crane needs to be stopped immediately in an emergency.

[0085] (6) A manual emergency oil pump is provided for emergency release of cargo in case of power failure.

[0086] 7. Common faults and repairs

[0087] (1) Fault phenomenon: The oil pump makes loud noise, the system vibrates, there are bubbles in the oil, and in severe cases, it is milky white;

[0088] Cause: The pump has suction;

[0089] Solution: It is mainly due to air leakage at the pump suction pipe. Apply butter to the possible leaking place. If the noise is reduced after applying butter, it means that there is air leakage at that place and it should be eliminated.

[0090] (2) Cause of failure: During operation, the system has no pressure;

[0091] Cause: System overflow valve failure;

[0092] Solution: Disassemble and inspect the relief valve, check whether the pilot valve hole is blocked or the main valve core is stuck, and disassemble and clean the valve core.

[0093] (3) Fault phenomenon: When the load is lowered, the load shows a "nodding" phenomenon;

[0094] Cause: The balance valve core is stuck or the balance valve opening pressure does not match the pressure;

[0095] Solution: Disassemble and clean the balancing valve and adjust its opening pressure to match the load.

[0096] (4) Fault phenomenon: the motor does not run;

[0097] Causes: a. No power supply; b. Fuse burnt out; c. Thermal relay overloaded or damaged; d. Start button poor contact or damaged; e. Motor damaged;

[0098] Solution: Check each part according to the possible causes and replace the damaged parts;

[0099] (5) The motor is running, but the lifting, rotation, luffing and folding of the arm are not in action;

[0100] Causes: a. The limit switch is damaged; b. The solenoid valve coil is burned out; c. The load is overweight;

[0101] Solution: a. Disconnect or replace the limit switch; b. Replace the solenoid valve; c. Reduce the lifting load.

[0102] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. A person skilled in the art may make several improvements and changes without departing from the above principles of the present invention, and these improvements and changes are also considered to be within the protection scope of the present invention.

Claims

1. An electric hydraulic folding and telescopic crane system for ships, characterized in that: The invention comprises a slewing system (1) and a telescopic folding arm system (2); the slewing system (1) comprises a rotating tower body (12) arranged on a fixed base (11); a boom assembly (21) of the telescopic folding arm system (2) is rotatably arranged on the top of the rotating tower body (12), and the telescopic folding arm system (2) comprises a folding arm (6); the boom assembly (21) is connected to one end of the folding arm (6) by power transmission; a plurality of folding arms (6) are embedded and arranged in series on the other end of the folding arm (6), and the plurality of folding arms (6) are telescopically arranged through the boom assembly (21); a lifting system (3) is respectively arranged at the bottom of the plurality of folding arms (6), and a lifting rope (211) of a lifting winch (212) on the boom assembly (21) is respectively connected to the lifting system (3); It also includes a cab (4); the cab (4) is arranged on the rotating tower body (12) and moves synchronously with the rotating tower body (12); the cab (4) is arranged at a distance from the ground through a platform ladder; the boom assembly (21) is arranged close to the cab (4), and the cab (4) is arranged on one side of the lifting system (3); It also includes a hydraulic pump station (5); the hydraulic pump station (5) is respectively connected to the rotating tower body (12) and the boom assembly (21) through a hydraulic system; The rotating tower body (12) comprises a rotating platform (121); the rotating device at the top of the fixed base (11) is drivingly connected to the bottom of the rotating platform (121); a protrusion (122) is provided at the bottom of one side edge of the rotating platform (121); a slewing limit block (111) is rotatably provided at one side of the top of the fixed base (11); the slewing limit block (111) is provided corresponding to the limit setting of the protrusion (122); A protruding plate (123) is fixedly provided on a side wall of the slewing limit block (111) corresponding to the protruding block (122); a rebound limit arc plate (124) is symmetrically fixedly provided on the top and bottom of one end of the protruding plate (123) away from the protruding block (122); the rebound limit arc plate (124) has an arc-shaped cross section, and the rebound limit arc plate (124) is bent upward in the direction of the protruding block (122) on the side away from the protruding plate (123); a collision block (112) is fixedly provided on the side wall of the slewing limit block (111); an adjustment plate (113) is symmetrically provided on the top and bottom of the collision block (112); a driving device on the collision block (112) is drivingly connected to a corresponding end of the adjustment plate (113); the adjustment plate (113) is bent downward in the direction of the collision block (112) on one end away from the collision block (112), forming a shape. The hook-shaped member is hook-shaped, and the end of the hook-shaped member is an elastic hook point (115); a limit slot (116) is formed between the upper and lower symmetrical hook-shaped members; the rebound limit arc plate (124) is correspondingly clamped in the limit slot (116); the opposite ends of the rebound limit arc plate (124) and the collision block (112) are respectively magnetic structures; when the protrusion (122) rotates to one side, the adjustment plate (113) drives the symmetrical elastic hook points (115) to move away from each other, and the rebound limit arc plate (124) escapes from the limit slot (116); when the protrusion (122) rotates, the adjustment plate (113) drives the elastic hook points (115) to move closer to each other, and the rebound limit arc plate (124) pushes the elastic hook points (115) away and embeds into the limit slot (116), and the hook-shaped member is limited to the rebound limit arc plate (124).

2. The electric hydraulic folding and telescopic crane system for ships according to claim 1, characterized in that: The boom assembly (21) comprises a fixed support plate (22) and a connecting square plate (23); the bottom end of the fixed support plate (22) is fixed on the rotating platform (121); the top end of the fixed support plate (22) is tilted upwards away from the lifting system (3), and the top end of the fixed support plate (22) is rotatably connected to one end of the connecting square plate (23); the angle between the connecting square plate (23) and the fixed support plate (22) is an acute angle; A mating block (231) is provided on a bottom protrusion of one end of the connecting square plate (23) close to the fixed support plate (22); the hydraulic system comprises a variable amplitude oil cylinder (51); the variable amplitude oil cylinder (51) is arranged on the rotating platform (121), and the driving end of the variable amplitude oil cylinder (51) is drivingly connected to the mating block (231); the variable amplitude oil cylinder (51) drives the connecting square plate (23) to swing through the mating block (231), thereby adjusting the angle between the connecting square plate (23) and the fixed support plate (22).

3. The electric hydraulic folding and telescopic crane system for ships according to claim 2, characterized in that: A crossbeam plate (24) is staggeredly arranged at one end of the connecting square plate (23) away from the fixed support plate (22) for rotational connection; a folding arm (6) is correspondingly arranged on one end of the crossbeam plate (24) away from the connecting square plate (23); a connecting plate (241) is arranged at the bottom protrusion of one end of the crossbeam plate (24) corresponding to the connecting square plate (23); a rotation bar (242) is arranged at intervals on one side of the crossbeam plate (24); two ends of the rotation bar (242) are respectively connected to the top of the crossbeam plate (24) and the connecting plate (241) through connecting rods to form a rectangular frame; the connecting square plate (23) is correspondingly rotated in the rectangular frame; a folding arm oil cylinder (52) is arranged at the bottom of the connecting square plate (23) near the matching block (231); the driving end of the folding arm oil cylinder (52) is correspondingly connected to the bottom of the rectangular frame for driving, and then drives the folding arm (6) to rotate through the crossbeam plate (24).

4. The electric hydraulic folding and telescopic crane system for ships according to claim 3, characterized in that: The folding arm (6) comprises a telescopic tube (61); a plurality of the telescopic tubes (61) are arranged in sequence toward an end away from the cross-beam plate (24), and the cross-sectional area of ​​the telescopic tubes (61) away from the cross-beam plate (24) gradually decreases, and the telescopic tubes (61) away from the cross-beam plate (24) are sequentially embedded in the telescopic tubes (61) close to the cross-beam plate (24); the hydraulic cylinder on the cross-beam plate (24) is correspondingly connected to the plurality of telescopic tubes (61) for driving; triangular plates (62) are respectively fixedly provided on the side walls of the ends of the plurality of telescopic tubes (61) away from the cross-beam plate (24); the telescopic movement of the plurality of telescopic tubes (61) correspondingly drives the plurality of triangular plates (62) to be close together and overlapped.

5. The electric hydraulic folding and telescopic crane system for ships according to claim 4, characterized in that: The lifting system (3) comprises a lifting hook (31); a pulley (63) is detachably provided at the bottom of the triangular plate (62); a lifting winch (212) is fixedly provided at the bottom of the crossbeam plate (24); a lifting rope (211) of the lifting winch (212) is correspondingly arranged on the pulley (63) at one end away from the lifting winch (212), and is wound on the lifting hook (31), thereby driving the lifting hook (31) to lift up and down.

6. The electric hydraulic folding and telescopic crane system for ships according to claim 5, characterized in that: A lifting limit block (631) is provided at the bottom of the pulley (63); a movable hole (632) is provided through the middle of the lifting limit block (631); one end of the lifting rope (211) wound around the hook (31) correspondingly passes through the movable hole (632); when the hook (31) rises to a position, the lifting limit block (631) is correspondingly limited to the hook (31).

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