Laying method for suspension arm and lifting hook in non-working state

Abstract

The invention provides a suspension arm in a non-working state and a suspension hook placing method, which comprises the following steps: controlling the head of the suspension arm and the suspension hook to be positioned above a rack through the amplitude variation of the suspension arm, and then controlling a rotary platform to drive the suspension arm to rotate, so that the suspension arm and the suspension hook on the suspension arm are positioned in the same vertical plane with the rack; then the lifting hook is located above the lifting hook rest stand through amplitude variation of the lifting arm, the winch is controlled to put down the steel wire rope, so that the lifting hook descends to the lifting hook rest stand, the lifting hook slides upwards and downwards along the inclined plane of the rest stand under the action of the gravity of the lifting hook, and the lifting hook is clamped and stayed on the inclined plane through the limiting device; finally, controlling the variable amplitude of the suspension arm in the vertical plane to enable the suspension arm to fall into a suspension arm rest stand at the top of the rack, and controlling the winch to take up the steel wire rope to tighten the steel wire rope to finish the rest of the suspension arm and the lifting hook; the lifting hook and the lifting arm can be quickly and accurately placed, time and labor are greatly saved, meanwhile, abrasion to the lifting hook and the lifting arm is reduced, and reliability and practicability are high.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a method for placing a boom and a hook in a non-operating state. Background Art

[0002] A large crane is usually installed on the deck of a large engineering ship. The crane is provided with a boom. A hook is connected to the boom through a wire rope. Large and heavy cargo is lifted by the hook. The boom is generally a truss structure with a length greater than the length of the hull. When the crane is not in operation, the boom and the hook need to be placed stably to prevent the boom and the hook from shaking due to the influence of wind and waves during the navigation of the ship, causing safety hazards. At the same time, it is also convenient for the inspection and maintenance of the boom and the hook.

[0003] For example, the patent document with Chinese patent application number 202221886202.7 and announcement date 2022.12.30 discloses a combined structure of a boom shelf and a hook box, including a shelf, a bracket, a main beam and a hook box, the shelf is fixed on the deck at the bow, one side of the shelf close to the edge of the deck is fixedly connected to one end of the bracket, and the bracket is higher than the deck, and the other end of the bracket extends out of the deck, the main beam is installed on the top of the shelf, and a placement groove cooperating with the boom is provided on the top of the main beam, and a roller for supporting the boom is provided at the bottom of the placement groove, and the hook box is installed at the end of the bracket away from the shelf, and the hook box cooperates with the hook.

[0004] The above document places the hook by a hook box and then places the boom by a main beam; however, since the opening of the hook box is small and the distance between the hook and the hook box is far during the placement process, it takes a long time and is difficult to place the boom and hook. Due to the influence of wind and waves, the hook swings during the lowering process, and the inner wall of the hook box collides with the hook, causing wear. Summary of the invention

[0005] The purpose of the present invention is to provide a method for placing a boom and a hook in a non-operating state, which can quickly and accurately place the hook and the boom, greatly saving time and manpower, while reducing the wear on the hook and the boom, and has high reliability and strong practicality.

[0006] To achieve the above-mentioned purpose, a method for placing a boom and a hook in a non-operating state includes a stand, a boom placing frame and a hook placing frame, wherein the boom placing frame is arranged on the top of the stand, the bottom of the stand is fixed on the ship deck, a support platform is vertically arranged on one side of the stand, the support platform is fixedly connected to the stand through a fixing rod, the hook placing frame is arranged on the support platform, the hook placing frame includes a limiting device, a first bracket and a second bracket, and the second bracket is provided with an inclined surface; The following steps are also included: S1 After the boom has completed the lifting operation, the boom is controlled to change its length so that the boom head is higher than the frame, and then the winch is controlled to retract the wire rope so that the wire rope drives the hook to rise to a height greater than the height of the frame, and the winch stops working; S2 controls the slewing platform to drive the boom to rotate in the horizontal plane where the slewing platform is located, so that the boom, the boom shelf, the stand and the hook shelf are in the same vertical plane; S3 controls the boom to change its amplitude so that the hook is located directly above the inclined surface on the second bracket, and the hook and the axis of the inclined surface are in the same vertical plane; S4 controls the winch to release the rope, so that the wire rope drives the hook to descend vertically until the hook contacts the inclined surface of the first bracket, slows down the winch rotation speed, and makes the hook slowly slide down along the inclined surface until the pulley on the hook contacts the limit device on the first bracket, and stops the winch rotation; S5 controls the boom to change its amplitude in the vertical plane of step S2, so that the boom falls into the boom resting frame at the top of the platform; S6 controls the winch to retract the wire rope, tightening the wire rope between the boom head and the hook shelf, thus completing the shelf placement of the boom and hook.

[0007] The above method controls the boom head and the hook to be located above the platform through the boom amplitude change, thereby preventing the slewing platform from colliding with the platform during the rotation of the boom, and thus making the boom and the hook on the boom and the platform in the same vertical plane, so that the hook can be placed on the hook shelf first, and then the boom can be placed horizontally, thereby avoiding the boom and the hook from swinging sharply due to the influence of wind and waves, improving the safety of the boom and the hook during non-operating state, and the above method can quickly and accurately achieve the stable placement of the boom and the hook, while reducing the wear on the boom and the hook.

[0008] Furthermore, the boom shelf includes a bracket and more than two roller devices, limit blocks are respectively provided on both sides of the top of the bracket, an opening is formed between the limit blocks, the roller device is arranged in the opening on one side of the limit block, the roller device includes a bracket and more than two roller groups, the roller group is detachably installed on the bracket along the width direction of the bracket, the bracket is arranged on one side of the limit block along the axial direction of the opening, the axis of the bracket is inclined inward and downward toward the axial direction of the opening, the roller group includes a pin, a limit piece and more than two rollers, the roller is sleeved on the pin, one end of the pin is provided with a through hole matching the fixing piece, and the limit piece is detachably arranged on the pin through the through hole.

[0009] The above arrangement, by setting a limit block, can form an opening on the bracket, so that the boom can slide into the opening along the limit block, thereby limiting the large left and right shaking of the boom, and playing the role of placing and limiting the swing of the boom; by setting a bracket and installing a roller group on the bracket, the boom lowered into the opening can be connected by a rolling connection through the roller group, thereby reducing the noise generated by friction and the wear of the boom. Due to the rolling, the boom can move in the axial direction of the opening, and the axis of the bracket is inclined inwardly and downwardly toward the axial direction of the opening, so that the rolling friction force generated when subjected to external force makes the boom tend to move downward into the bracket, reducing the possibility of the boom moving outward due to external force, and can slow down the moving distance of the boom in the axial direction of the opening, so that the placement of the boom is more stable.

[0010] Furthermore, the angle formed between the axis where the bracket is located and the axis where the opening is located is 9°~13°.

[0011] The above arrangement forms an angle with the axis of the opening, which can further ensure that the moving distance of the boom in the direction of the opening axis is reduced, making the placement of the boom more stable.

[0012] Furthermore, the lower end of the bracket is fixed on the bracket, and the upper end of the bracket is fixedly provided with more than two mounting plates along the length direction of the bracket, the mounting plates are spaced apart and arranged in parallel, more than two through holes are provided on the mounting plates, the through holes at the same position of adjacent mounting plates are coaxially arranged, the top plane of the mounting plates is lower than the top of the roller, the width of the spacing between the mounting plates is greater than the width of the roller, and the distance between the centers of two through holes on the same mounting plate is greater than the diameter of the roller; Support frames are fixedly provided on both sides of the bottom of the bracket, and the support frames include a support frame 1 and a support frame 2, the support frame 1 is vertically connected to the bracket, one end of the support frame 2 is vertically connected to the bracket, and the other end of the support frame 2 is arranged to deviate outwards; Step S5 also includes that after the boom is changed, under the guidance of the chamfered portion, the boom is dropped into the bracket along the opening, so that the flat plate arranged on the boom abuts against the top of the roller arranged on the bracket through the bracket, thereby achieving rolling contact between the flat plate and the roller.

[0013] The above arrangement makes it easy for the pin to pass through the through hole, thereby installing the roller between the two mounting plates, so that the rotation of the rollers between adjacent roller groups does not interfere with each other; and the arrangement that the top plane of the mounting plate is lower than the top of the roller can make the flat plate on the boom abut against the roller, and during the movement, the flat plate and the roller can roll, thereby reducing friction; the bracket is supported by the support frame, and the support frame is arranged to deviate outward, which can increase the friction between the support frame and the deck.

[0014] Furthermore, a chamfered portion, a transition portion and a supporting portion are provided on one side of the limit block, and pads are provided on the chamfered portion and the transition portion. The angle formed between the top of the limit block and one end of the chamfered portion is 120°~130°, and the angle formed between the other end of the chamfered portion and one end of the transition portion is 140°~150°. The other end of the transition portion is plane-connected to one end of the supporting portion, and the other end of the supporting portion is fixedly connected to the bracket, and the width of the other end of the supporting portion is greater than the width of one end of the supporting portion.

[0015] The above arrangement, by providing the chamfered portion, can play a guiding role during the lowering process of the boom, thereby allowing the boom to slide into the opening along the transition portion, and the support portion can increase the contact area between the limit block and the bracket, so that the connection between the limit block and the bracket can withstand greater stress.

[0016] Furthermore, the limit block includes limit block 1 and limit block 2, and limit block 1 and limit block 2 are symmetrically and parallelly arranged on both sides of the top of the bracket about the axis where the opening is located, and the width of the opening is greater than the width of the boom.

[0017] The above arrangement makes it easy for the first and second limit blocks to limit the boom, so that the boom can be placed exactly into the opening during the lowering process.

[0018] Further, the first bracket is fixedly connected to the second bracket through a connecting column, an angle is formed between the first bracket and the second bracket at the fixed connection, the angle of the angle is 30°~45°, an inclined surface is provided on the second bracket, a buffer gasket is fixedly provided on the inclined surface along the length direction of the second bracket, the limiting device includes more than two blocks, a limiting opening is formed between the blocks located on the inclined surface, the blocks are symmetrically arranged on both sides of the buffer gasket about the axis where the limiting opening is located and are arranged perpendicular to the inclined surface, and an inclined portion is provided on one side of the block located at the limiting opening; Step S4 also includes that after the hook is lowered to the inclined surface and contacts the buffer gasket on the inclined surface, the inclined surface supports the hook, and friction is generated between the hook and the buffer gasket, thereby reducing the swing of the hook. As the speed of the winch decreases, the gravity of the hook is greater than the sum of the traction force of the wire rope and the friction force, so that the hook slides down along the axis of the inclined surface under the action of its own gravity until the two sides of the pulley on the hook abut against the inclined part of the block to generate an upward and inward supporting force, so that the hook is stuck between the two blocks and stays on the inclined surface.

[0019] The above arrangement, by setting the first bracket and the second bracket, and making the angle between the first bracket and the second bracket an acute angle, so that when the bracket is placed upright, the second bracket can be tilted with the first bracket, so as to facilitate the hook to be placed on the second bracket along the inclined surface of the second bracket; and a buffer gasket is set on the inclined surface, which can reduce the friction between the hook and the inclined surface during the lowering process, and at the same time, the inclined surface can support the hook; in addition, blocks are set on both sides of the inclined surface, so that after the hook slides down the inclined surface for a certain distance, the block can stop the hook from sliding down, so that the hook can stop on the bracket, so that the stable placement of the hook can be quickly achieved, saving manpower and time.

[0020] Furthermore, the blocks are relatively arranged, and a connecting portion is provided on one side of the block located at the limit opening, the connecting portion is connected to the inclined portion, the width of the pulley on the hook is greater than the width between the inclined portions, and the width between the inclined portions is greater than or equal to the width between the connecting portions.

[0021] The above arrangement facilitates the hook to slide into the limit opening along the inclined portion, and then the inclined portion clamps the two sides of the pulley on the hook, so that the hook stays between the blocks for placement, and the hook passes through the connecting portions, thereby stably fixing the hook on the second bracket.

[0022] Furthermore, one end of the inclined portion is connected to the top of the block to form an angle of 120°~135°, the other end of the inclined portion is connected to one end of the connecting portion to form an angle of 135°~150°, and the other end of the connecting portion is vertically connected to the bottom of the block.

[0023] The above arrangement can limit the hook that slides down into the limiting opening through the inclined portion, so that both sides of the hook abut against the inclined portion, so that the inclined portion exerts an upward and outward force on the hook, thereby stopping the hook on the second bracket.

[0024] Furthermore, a support rod is provided at the bottom of the block, one end of the support rod is fixedly connected to the bottom of the block, the other end of the support rod passes through the second bracket and abuts against the contact plane, and more than two connecting rods are provided between the first bracket and the second bracket, and both ends of the connecting rod are fixedly connected to the first bracket and the second bracket respectively.

[0025] In the above arrangement, the support rod supports the stopper, and the connection rod is provided to strengthen the stability between the first bracket and the second bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the placement of the boom and hook in the present invention.

[0027] Figure 2 It is a front view of the boom shelf in the present invention.

[0028] Figure 3 It is a top view of the boom shelf in the present invention.

[0029] Figure 4 It is a side view of the boom shelf in the present invention.

[0030] Figure 5 It is a side view of the roller device in the present invention.

[0031] Figure 6 It is a top view of the roller device in the present invention.

[0032] Figure 7 It is a front view of the roller device in the present invention.

[0033] Figure 8 for Figure 2 Enlarged view of A1 in the middle.

[0034] Fig. 9 It is a side view of the hook shelf in the present invention.

[0035] Fig.10 It is a front view of the hook shelf in the present invention.

[0036] Fig.11 It is a schematic diagram of the installation of the buffer gasket in the present invention.

[0037] Fig.12 It is a schematic diagram of placing the hook on an inclined surface in the present invention.

[0038] Fig.13 for Fig.10 Enlarged view of C1 in the middle.

[0039] Fig.14 for Figure 1 Enlarged view of point B1 in the middle. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] like Figures 1 to 14 As shown, a method for placing a boom and a hook in a non-operating state includes a stand, a boom placing frame and a hook placing frame, wherein the boom placing frame is arranged on the top of the stand s1, and the bottom of the stand s1 is fixed on the ship deck, a supporting platform s2 is vertically arranged on one side of the stand s1, one end of the supporting platform s2 is fixedly connected to the stand s1, and the other end of the supporting platform s2 is fixedly connected to the stand s1 through a fixing rod s3, the hook is placed on the supporting platform s2, and the hook placing frame includes a limiting device, a first bracket 1 and a second bracket 2, and the second bracket 2 is provided with an inclined surface 21.

[0042] The boom shelf frame includes a bracket a1 and two roller devices, and limit blocks are respectively provided on both sides of the top of the bracket a1, and an opening a3 is formed between the limit blocks. The roller device is arranged in the opening a3 and is located on one side of the limit block. By setting the limit block, the opening a3 can be formed on the bracket a1, so that the boom slides into the opening a3 along the limit block, thereby limiting the boom from swinging left and right, playing the role of shelving and limiting the swing of the boom; support frames are provided on both sides of the bottom of the bracket a1, and the support frames are fixed to the bottom of the bracket a1 by welding, and the support frames include a support frame-a 41 and support frame a42, support frame a41 is vertically connected to bracket a1, one end of support frame a42 is vertically connected to bracket a1, and the other end of support frame a42 is set to deviate outward, so that bracket a1 can be supported by the support frame, and support frame a42 is set to deviate outward, so that the downward projection surface of the space enclosed by the support frame is increased, thereby improving the stability of the support. In this embodiment, the number of support frame a41 and support frame a42 is set to two, and support frame a41 and support frame a42 are fixed to the top of the stand s1 by bolts.

[0043] like Figure 2 and 8 As shown, one side of the limit block is provided with a chamfered portion a21, a connecting portion a22 and a supporting portion a23, an angle a is formed between the top of the limit block and one end of the chamfered portion a21, and the angle range of the angle a is 120°~130°, and an angle b is formed between the other end of the chamfered portion a21 and one end of the connecting portion a22, and the angle range of the angle b is 130°~145°. In this embodiment, the angle a is 127°, the angle b is 143°, and the other end of the connecting portion a22 is plane-connected to one end of the supporting portion a23, that is, the upper end surface of the other end of the connecting portion a22 is flush with one end of the supporting portion a23 after being connected, and the other end of the supporting portion a23 is fixedly connected to the bracket a1 The width of the other end of the support portion a23 is greater than the width of one end of the support portion a23. By setting the chamfered portion a21, it can play a guiding role in the lowering process of the boom, so that the boom can slide into the opening along the connecting portion a22, and the support portion a23 can increase the contact area between the limit block and the bracket a1, so that the connection between the limit block and the bracket a1 can withstand greater stress. A pad a24 is provided on the chamfered portion a21 and the connecting portion a22. In this embodiment, the pad a24 is a sleeper, and a screw hole a25 is provided on the sleeper. The sleeper is fixed to the chamfered portion a21 and the connecting portion a22 by screws, so as to prevent the boom from directly colliding with the limit block and causing friction, which in turn causes wear of the boom.

[0044] In this embodiment, if Figure 2 , 8As shown, the limit block includes a limit block 1 211 and a limit block 222. The limit block 1 211 and the limit block 222 are symmetrically and parallelly arranged on both sides of the top of the bracket a1 about the axis a5 where the opening a3 is located. The width of the opening a3 is greater than the width of the boom, so that the limit block 1 211 and the limit block 222 can limit the boom, so that the boom can be placed in the opening a3 during the lowering process.

[0045] like Figure 4-8 As shown, the roller device includes a bracket 11 and more than two roller groups. The bracket 11 is arranged on one side of the limit block along the axis a5 direction of the opening a3. An angle c is formed between the axis 9 where the bracket 11 is located and the axis a5 where the opening a3 is located. In this embodiment, the angle of the angle c is 10°. The roller group is detachably installed on the bracket 11 along the width direction of the bracket 11. The roller group includes a pin 12, a limiter (not marked in the figure) and more than two rollers 13. The roller 13 is sleeved on the pin 12. One end of the pin 12 is provided with a through hole matching the fixing member. The limiter is detachably arranged on the pin 12 through the through hole. In this embodiment, the number of rollers in each roller group is set to three, and the limiter is a latch.

[0046] like Figure 4-7 As shown, the lower end of the bracket 11 is fixed on the bracket a1, and the upper end of the bracket 11 is fixed with more than two mounting plates 14 along the length direction of the bracket 11. The mounting plates 14 are provided with intervals 15 and are arranged in parallel. The mounting plates 14 are provided with more than two through holes 16. The through holes 16 at the same position of adjacent mounting plates 14 are coaxially arranged. The top plane 17 of the mounting plate 14 is lower than the top of the roller 13. In this way, after the boom is placed on the bracket a1, the flat plate on the boom can abut against the roller 13. During the movement, the flat plate and the roller 13 can roll, thereby reducing friction and noise. At the same time, the width of the interval 15 between the mounting plates 14 is greater than the width of the roller 13, and the distance between the centers of the two through holes 16 on the same mounting plate 14 is greater than the diameter of the roller 13, so that the roller 13 can be installed between the two mounting plates 14, and the rotation of the rollers 13 between the adjacent roller groups does not interfere with each other.

[0047] like Figure 9-12 As shown, one end of the first bracket 1 is fixedly connected to one end of the second bracket 2 through a connecting column 3, and an angle f is formed between the first bracket 1 and the second bracket 2 at the connection, and the angle f is 30°~45°. In this embodiment, the angle f is 30°, and the second bracket 2 is provided with an inclined surface 21, and a buffer gasket 22 is fixedly provided on the inclined surface 21 along the length direction of the second bracket 2, as shown in FIG. Fig.11As shown, the buffer gasket 22 is provided with more than two countersunk holes 23, and the buffer gasket 22 is fixed to the inclined surface 21 by means of bolts 24 passing through the countersunk holes 23. In this way, during the lowering process of the hook z1, the sliding friction between the hook z1 and the inclined surface 21 can be reduced, and the hook z1 can slide down along the inclined surface 21 and into the limit opening 5 under the action of its own gravity. In this embodiment, the buffer gasket 22 is a sleeper.

[0048] like Fig.13 As shown, the limiting device includes more than two blocks 4. In this embodiment, the number of the blocks 4 is set to two. The blocks 4 are relatively arranged on the inclined surface 21, and a limiting opening 5 is formed between the two blocks 4. The two blocks 4 are symmetrically arranged on both sides of the buffer gasket 22 about the axis 6 where the limiting opening 5 is located and are perpendicular to the inclined surface 21. The block 4 is located on one side of the limiting opening 5 and is provided with an inclined portion 41 and a connecting portion 42. The connecting portion 42 is connected to the inclined portion 41. Fig.13 As shown, one end of the inclined portion 41 is connected to the top of the stopper 4 to form an angle d, and the angle of angle d is 110°~125°. The other end of the inclined portion 41 is connected to one end of the connecting portion 42 to form an angle e, and the angle of angle e is 145°~160°. The other end of the connecting portion 42 is vertically connected to the bottom of the stopper 4. In this embodiment, the angle of angle d is 110°, and the angle of angle e is 160°. In this way, the hook z1 that slides down into the limiting opening 5 can be limited by the inclined portion 41, so that the two sides of the pulley z2 on the hook z1 abut against the inclined portion 41, so that the inclined portion 41 generates an oblique upward and outward force on the two sides of the pulley z2 on the hook z1, so that the pulley z2 on the hook z1 is clamped between the inclined portions 41, and the hook z1 is stopped on the second bracket 2.

[0049] like Fig.12 As shown, the width of the pulley z2 on the hook z1 is greater than the width between the inclined portions 41, and the width between the inclined portions 41 is greater than or equal to the width between the connecting portions 42, so that the hook z1 can pass through between the connecting portions 42, and the inclined portions 41 can be used to clamp the two sides of the pulley z2 on the hook z1, so that the hook z1 can be stopped between the block blocks 4 to be placed.

[0050] like Fig. 9 As shown, a support rod 7 is provided at the bottom of the stopper 4, one end of the support rod 7 is fixedly connected to the bottom of the stopper 4, the other end of the support rod 7 passes through the second bracket 2 and abuts against the contact plane, and more than two connecting rods 8 are provided between the first bracket 1 and the second bracket 2, and the two ends of the connecting rod 8 are fixedly connected to the first bracket 1 and the second bracket 2 respectively, so that the stability between the first bracket 1 and the second bracket 2 can be strengthened.

[0051] The following specific steps are also included: S1 After the boom completes the lifting operation, control the boom to change its length so that the boom head is higher than the frame, then control the winch to retract the wire rope so that the wire rope drives the hook to rise until the height of the hook is greater than the height of the frame, and then the winch stops working.

[0052] S2 controls the slewing platform to drive the boom to rotate in the horizontal plane where the slewing platform is located, so that the boom, the boom shelf, the stand and the hook shelf are in the same vertical plane.

[0053] S3 controls the boom to change its amplitude so that the hook is located directly above the inclined surface on the second bracket, and the hook and the axis of the inclined surface are in the same vertical plane.

[0054] S4 controls the winch to release the rope, so that the wire rope drives the hook to descend vertically until the hook contacts the buffer gasket on the inclined surface of the second bracket. The inclined surface supports the hook, and friction is generated between the buffer gasket and the hook, reducing the shaking of the hook and slowing down the winch rotation speed, so that the gravity of the hook is greater than the sum of the traction force of the wire rope and the friction force. The hook slides down along the axis of the inclined surface under the action of its own gravity, and the hook passes through the limit openings between the blocks until the two sides of the pulley on the hook contact the inclined parts of the blocks, generating an oblique upward and inward supporting force on the pulley, so that the hook is stuck between the two blocks and stays on the inclined surface, stopping the winch rotation, and completing the placement of the hook.

[0055] S5 controls the boom to change its amplitude in the vertical plane of step S2. Under the guidance of the chamfered portion, the boom falls into the bracket along the opening, so that the flat plate arranged on the boom abuts against the top of the roller arranged on the bracket through the support, thereby achieving rolling contact between the flat plate and the roller, thereby avoiding wear caused by direct contact between the bracket and the boom, and completing the suspension of the boom.

[0056] S6 controls the winch to retract the wire rope, tightening the wire rope between the boom head and the hook shelf, thus completing the shelf placement of the boom and hook.

[0057] The working principle of the present invention is as follows: the boom head and the hook are controlled to be located above the platform through boom luffing, and then the slewing platform is controlled to drive the boom to rotate, so that the boom and the hook on the boom are in the same vertical plane with the platform, and then the boom luffing is made to be located above the hook shelf, and the winch is controlled to lower the wire rope, so that the hook is lowered to the hook shelf, and under the action of the hook's own gravity, the hook slides down along the inclined surface of the shelf, and the hook is stuck and stays on the inclined surface through the limit device, and finally the boom is controlled to change its luffing in the vertical plane so that the boom falls into the boom shelf on the top of the platform, and the winch is controlled to recycle the wire rope to tighten the wire rope, thereby completing the placement of the boom and the hook.

[0058] In this embodiment, after the boom and the hook are put aside and need to be used, step S7 is also included: controlling the winch to release the rope, so that the wire rope connected to the hook is in a relaxed state, the winch stops working, and then controlling the boom to change its length, so that the boom is separated from the boom placement frame, driving the wire rope connected to the hook from a relaxed state to a taut state, and then driving the hook to move out of the limit opening along the inclined surface. When the hook is about to separate from the inclined surface, the boom is stopped from changing its length. After the hook stops shaking, the boom is controlled to change its length again, so that the hook is separated from the inclined surface for operation.

Claims

1. A method for placing a boom and a hook in a non-operating state, comprising a stand, a boom placing frame and a hook placing frame, wherein the boom placing frame is arranged on the top of the stand, the bottom of the stand is fixed on the ship deck, the support platform is vertically arranged on one side of the stand, the support platform is fixedly connected to the stand through a fixing rod, the hook is placed on the support platform, the hook placing frame comprises a limit device, a first bracket and a second bracket, and the second bracket is provided with an inclined surface; characterized in that: The following steps are also included: S1 After the boom has completed the lifting operation, the boom is controlled to change its length so that the boom head is higher than the frame, and then the winch is controlled to retract the wire rope so that the wire rope drives the hook to rise to a height greater than the height of the frame, and the winch stops working; S2 controls the slewing platform to drive the boom to rotate in the horizontal plane where the slewing platform is located, so that the boom, the boom shelf, the stand and the hook shelf are in the same vertical plane; S3 controls the boom to change its amplitude so that the hook is located directly above the inclined surface on the second bracket, and the hook and the axis of the inclined surface are in the same vertical plane; S4 controls the winch to release the rope, so that the wire rope drives the hook to descend vertically until the hook contacts the inclined surface of the first bracket, slows down the rotation speed of the winch, and makes the hook slowly slide down along the inclined surface until the pulley on the hook contacts the limit device on the first bracket, and stops the rotation of the winch; S5 controls the boom to change its amplitude in the vertical plane of step S2, so that the boom falls into the boom resting frame at the top of the platform; S6 controls the winch to retract the wire rope, tightening the wire rope between the boom head and the hook shelf, thus completing the shelf placement of the boom and hook.

2. A method for placing a boom and a hook in a non-operating state according to claim 1, characterized in that: The boom shelf includes a bracket and more than two roller devices, and limit blocks are respectively provided on both sides of the top of the bracket. An opening is formed between the limit blocks. The roller device is arranged in the opening on one side of the limit block. The roller device includes a bracket and more than two roller groups. The roller group is detachably installed on the bracket along the width direction of the bracket, and the bracket is arranged on one side of the limit block along the axial direction of the opening. The axis where the bracket is located is inclined inward and downward toward the axial direction of the opening. The roller group includes a pin, a limit piece and more than two rollers. The roller is sleeved on the pin, and one end of the pin is provided with a through hole matching the fixing piece. The limit piece is detachably arranged on the pin through the through hole.

3. A method for placing a boom and a hook in a non-operating state according to claim 2, characterized in that: The angle formed between the axis where the bracket is located and the axis where the opening is located is 9°~13°.

4. A method for placing a boom and a hook in a non-operating state according to claim 3, characterized in that: The lower end of the bracket is fixed on the bracket, and the upper end of the bracket is fixedly provided with more than two mounting plates along the length direction of the bracket, the mounting plates are spaced and arranged in parallel, the mounting plates are provided with more than two through holes, the through holes at the same position of adjacent mounting plates are coaxially arranged, the top plane of the mounting plate is lower than the top of the roller, the width of the interval between the mounting plates is greater than the width of the roller, and the distance between the centers of two through holes on the same mounting plate is greater than the diameter of the roller; Support frames are fixedly provided on both sides of the bottom of the bracket, and the support frames include a support frame 1 and a support frame 2, the support frame 1 is vertically connected to the bracket, one end of the support frame 2 is vertically connected to the bracket, and the other end of the support frame 2 is arranged to deviate outwards; Step S5 also includes that after the boom is changed, under the guidance of the chamfered portion, the boom is dropped into the bracket along the opening, so that the flat plate arranged on the boom abuts against the top of the roller arranged on the bracket through the bracket, thereby achieving rolling contact between the flat plate and the roller.

5. The method for determining the angle between the guide pulley and the wire rope according to claim 2, characterized in that: A chamfered portion, a transition portion and a supporting portion are provided on one side of the limit block, and pads are provided on the chamfered portion and the transition portion. The angle formed between the top of the limit block and one end of the chamfered portion is 120°~130°, and the angle formed between the other end of the chamfered portion and one end of the transition portion is 140°~150°. The other end of the transition portion is plane-connected to one end of the supporting portion, and the other end of the supporting portion is fixedly connected to the bracket, and the width of the other end of the supporting portion is greater than the width of one end of the supporting portion.

6. A method for placing a boom and a hook in a non-operating state according to claim 5, characterized in that: The limit blocks include limit block 1 and limit block 2, which are symmetrically and parallelly arranged on both sides of the top of the bracket about the axis where the opening is located, and the width of the opening is greater than the width of the boom.

7. A method for placing a boom and a hook in a non-operating state according to claim 1, characterized in that: The first bracket is fixedly connected to the second bracket through a connecting column, an angle is formed between the first bracket and the second bracket at the fixed connection, and the angle of the angle is 30°~45°, the second bracket is provided with an inclined surface, and a buffer gasket is fixedly provided on the inclined surface along the length direction of the second bracket, the limiting device includes more than two blocks, and a limiting opening is formed between the blocks located on the inclined surface, the blocks are symmetrically arranged on both sides of the buffer gasket about the axis where the limiting opening is located and are arranged perpendicular to the inclined surface, and the block is provided with an inclined portion on one side of the limiting opening; Step S4 also includes that after the hook is lowered to the inclined surface and contacts the buffer gasket on the inclined surface, the inclined surface supports the hook, and friction is generated between the hook and the buffer gasket, thereby reducing the swing of the hook. As the speed of the winch decreases, the gravity of the hook is greater than the sum of the traction force of the wire rope and the friction force, so that the hook slides down along the axis of the inclined surface under the action of its own gravity until the two sides of the pulley on the hook abut against the inclined part of the block to generate an upward and inward supporting force, so that the hook is stuck between the two blocks and stays on the inclined surface.

8. A method for placing a boom and a hook in a non-operating state according to claim 7, characterized in that: The blocks are arranged relatively to each other, and a connecting portion is provided on one side of the block located at the limit opening, the connecting portion is connected to the inclined portion, the width of the pulley on the hook is greater than the width between the inclined portions, and the width between the inclined portions is greater than or equal to the width between the connecting portions.

9. A method for placing a boom and a hook in a non-operating state according to claim 7, characterized in that: One end of the inclined portion is connected to the top of the block to form an angle of 120°~135°, the other end of the inclined portion is connected to one end of the connecting portion to form an angle of 135°~150°, and the other end of the connecting portion is vertically connected to the bottom of the block.

10. A method for placing a boom and a hook in a non-operating state according to claim 9, characterized in that: A support rod is provided at the bottom of the block, one end of the support rod is fixedly connected to the bottom of the block, and the other end of the support rod passes through the second bracket and abuts against the contact plane. More than two connecting rods are provided between the first bracket and the second bracket, and both ends of the connecting rod are fixedly connected to the first bracket and the second bracket respectively.

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