A sail with removable hydraulic cylinder members and a method of removal

Abstract

A kind of sail with removable hydraulic cylinder component and removal method, fixed heightening seat at the bottom of second mast, transition flange is arranged between two mast flange and hydraulic cylinder flange, is fixed into an organic whole by bolt, transition flange is formed by the butt joint of two semicircular flanges. Heightening seat supports second mast, reinforcing locking component is added between hydraulic cylinder and hydraulic rod, lifting lug is fixed on the two sides of the reinforcing structure at the bottom of second mast, lifting ring is arranged on the two sides of transition flange, chain hoist passes through lifting lug and lifting ring in turn, bolt between transition flange and two mast flange is disassembled, hydraulic cylinder body is separated from second mast, then transition flange is separated, chain hoist is pulled tight, two semicircles of transition flange are disassembled from the two sides of hydraulic cylinder respectively and are lifted to ground. The present application can be separately disassembled and installed under the condition that the large hydraulic cylinder meets the condition of not disassembling large structure without changing the stress form of hydraulic cylinder, and maintenance operation of hydraulic cylinder is carried out.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of design and construction of wing sail for ships, in particular to a sail with removable hydraulic cylinder components and a removal method. BACKGROUND

[0002] At present, the wing sail for ships is a domestic original design, and the application of the equipment on a VLCC is the leading technology in the world. The sail completes the effective utilization of wind energy through lifting and rotating actions. The hydraulic cylinder, as the core hydraulic equipment of the sail, is self-evident in importance. In general, the hydraulic cylinder in mechanical equipment may have a probability of seal damage or surface plating scratch of the hydraulic cylinder rod during long-term use, causing hydraulic oil leakage and accelerated structure corrosion, so it is necessary to remove the hydraulic cylinder from the equipment, replace the seal and repair the scratched plating. For the requirement of long-term service life of the sail, it is necessary to select a scheme that can realize the removal and installation of the hydraulic cylinder without disassembling the mast, only when the ship is at port.

[0003] The mast of the sail has three sections (first mast, second mast and third mast), which are nested structures. The hydraulic cylinder used by the sail is a large hydraulic cylinder with a stroke of about 10 meters. In order to lift the second mast, the third mast and the sail, the hydraulic cylinder rod is fixed at the lower structure of the first mast, and the hydraulic cylinder flange is connected to the connecting plate at the bottom of the second mast and fixed by a plurality of connecting bolts. As shown in Figure 1 , the hydraulic cylinder connection mode I, the hydraulic cylinder flange is installed below the connecting plate at the bottom of the second mast, and the upper surface of the hydraulic cylinder flange can directly apply a pushing force to the second mast, and the stress form is relatively stable. When the bolts are loose or damaged, it can also ensure that other bolts will not bear increased load, and even the risk of falling of the second mast, protecting the safety of the lower equipment and related personnel from being affected.

[0004] According to Figure 1 the structure shown in the hydraulic cylinder connection mode I schematic diagram, although the connection structure is reasonable in stress form, the inner hole of the connecting plate at the bottom of the second mast is smaller than the outer diameter of the hydraulic cylinder flange, and the hydraulic cylinder is blocked in the first mast and the second mast. Only by disassembling all three masts can the requirement be met. Therefore, this connection form needs to be further optimized.

[0005] If the hydraulic cylinder is lifted out from the top end of the mast, the most direct way is to place the hydraulic cylinder flange above the connecting plate of the second mast (see Figure 2), but the thrust of the hydraulic cylinder is transmitted to the second mast through the flange bolts when the sail is rising. This structure causes the stress of the weak part to increase, and the flange bolts bear the high tension force for a long time, which greatly increases the risk of bolt fatigue, loosening and breaking. After the bolt breaks, the mast cannot be supported by the hydraulic cylinder and will fall freely, causing great damage to the equipment and increasing the risk of personal injury. SUMMARY

[0006] To solve the above problems, the present application provides a sail with removable hydraulic cylinder components and a removal method, which adopts the technical scheme of:

[0007] A sail with removable hydraulic cylinder components, the sail base is fixed with a first mast, the first mast is sleeved with a second mast, the second mast is provided with a hydraulic cylinder, and the hydraulic cylinder is provided with a hydraulic cylinder flange.

[0008] The bottom of the first mast is fixed with a hydraulic cylinder fixing frame, the bottom of the second mast is fixed with a reinforcing structure, the reinforcing structure is fixed with a second mast flange below, the hydraulic rod of the hydraulic cylinder is connected with the hydraulic cylinder fixing frame, the cylinder body of the hydraulic cylinder passes through the reinforcing structure and is connected with the second mast flange, a transition flange is arranged between the second mast flange and the hydraulic cylinder flange, the hydraulic cylinder flange, the transition flange and the second mast flange are sequentially arranged from bottom to top and are fixed into one body by bolts.

[0009] The transition flange is formed by butting two semicircular flanges, and the outer diameter of the hydraulic cylinder flange is smaller than the inner diameter of the second mast flange.

[0010] The above-mentioned sail with removable hydraulic cylinder components is further provided with a first mast, a second mast and a third mast, the second mast is nested in the first mast, and the third mast is nested in the second mast.

[0011] The removal method of the above-mentioned sail with removable hydraulic cylinder components is as follows:

[0012] S1: A crane is arranged outside the mast, and the crane is connected with the bottom of the cylinder body of the hydraulic cylinder.

[0013] S2: First, the second mast is raised, a heightening seat is fixed on the bracket arranged in the first mast, after the heightening seat is fixed, the second mast is lowered to the bottom, and the bottom of the second mast is seated on the heightening seat.

[0014] S3: The hydraulic rod of the hydraulic cylinder is reinforced and locked, connecting plates are symmetrically fixed on the two sides of the wall of the hydraulic rod, eye plates are fixed on the connecting plates, connecting pieces are arranged on the bolts connecting the hydraulic cylinder flange and the transition flange, and a cable is fixed through the eye plates and the connecting pieces in sequence.

[0015] S4: A lifting point is arranged on the reinforcing structure at the bottom of the second mast, lifting lugs are fixed on both sides of the reinforcing structure, lifting rings are arranged on both sides of the transition flange, the hand-operated hoist is sequentially threaded through the lifting lugs and the lifting rings, the bolts between the transition flange and the second mast flange are disassembled, the hydraulic cylinder body is separated from the second mast, then the transition flange is separated, the hand-operated hoist is tightened, and the two semicircular flanges of the transition flange are disassembled from both sides of the hydraulic cylinder and hoisted to the ground;

[0016] S5: The hydraulic rod is separated from the hydraulic cylinder fixing frame at the bottom of the first mast, and the hydraulic rod is hoisted out from above the mast by using an external crane.

[0017] The above-mentioned method for disassembling the sail with the removable hydraulic cylinder component is further provided with a transition flange, the inner edge of the transition flange is connected with the hydraulic cylinder flange through bolts, and the outer edge of the transition flange is connected with the second mast flange through bolts.

[0018] The above-mentioned method for disassembling the sail with the removable hydraulic cylinder component is further provided with a plurality of heightening seats arranged in the circumferential direction of the first mast, and there is a spacing between the heightening seats.

[0019] The above-mentioned method for disassembling the sail with the removable hydraulic cylinder component is further provided with a transition flange formed by butt jointing two semicircular flanges through bolts.

[0020] The above-mentioned method for disassembling the sail with the removable hydraulic cylinder component is further provided with that the heightening seat is fixed with the bracket through bolts.

[0021] The above-mentioned method for disassembling the sail with the removable hydraulic cylinder component is further provided with that the hand-operated hoist is a 2t lifting weight hand-operated hoist.

[0022] The above-mentioned method for disassembling the sail with the removable hydraulic cylinder component is further provided with that the stroke of the hydraulic cylinder is 10m.

[0023] The above-mentioned method for disassembling the sail with the removable hydraulic cylinder component is further provided with that the weight of the transition flange is 144kg.

[0024] The present application adds a transition flange between the hydraulic cylinder flange and the second mast, without changing the stress form of the hydraulic cylinder, so that the large hydraulic cylinder can be disassembled and installed separately under the condition that the large structure is not disassembled, and the maintenance operation of the hydraulic cylinder is carried out. At the same time, auxiliary mechanisms such as heightening seats and lifting lugs are added to ensure that the disassembly and assembly process of the hydraulic cylinder has very high feasibility and safety. The operation and maintenance conditions of the hydraulic cylinder are reduced as a whole, that is, the ship can also meet the operation conditions when it is parked in the port. Further, the service life of the sail equipment is improved, and the use risk is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1is the existing hydraulic cylinder connection mode I;

[0026] Figure 2 is the existing hydraulic cylinder connection mode II;

[0027] Figure 3 is the assembled structure schematic diagram of the application;

[0028] Figure 4 is the disassembly and assembly process structure schematic diagram of the application;

[0029] Figure 5 is the transition flange structure schematic diagram;

[0030] Wherein: 1-hydraulic cylinder fixing frame, 2-connector, 3-lifting ring, 4-heightening seat, 5-hand-operated hoist, 6-lifting lug, 7-strengthening structure, 8-hydraulic cylinder body, 9-second mast, 10-first mast, 11-transition flange, 12-bracket, 13-connection plate, 14-two-mast flange, 15-mast base, 16-hydraulic rod, 17-hydraulic cylinder flange. DETAILED DESCRIPTION

[0031] The application is further described in conjunction with the drawings.

[0032] As Figure 1 shown in a kind of sail with removable hydraulic cylinder component and removal method, first mast bottom is fixed with hydraulic cylinder fixing frame, second mast bottom is fixed with strengthening structure, strengthening structure below is fixed with two-mast flange, the hydraulic rod of hydraulic cylinder is connected with hydraulic cylinder fixing frame, the cylinder body of hydraulic cylinder passes through strengthening structure, is connected with two-mast flange, transition flange is arranged between two-mast flange and hydraulic cylinder flange, hydraulic cylinder flange, transition flange, two-mast flange are sequentially arranged from bottom to top, and are fixed into an organic whole by bolt. Transition flange is formed by the butt joint of two semicircular flanges, and the outer diameter of hydraulic cylinder flange is less than the inner diameter of two-mast flange.

[0033] The steps of removing hydraulic cylinder are as follows:

[0034] S1: hoist is arranged outside the mast, and the hoist is connected with the bottom of the hydraulic cylinder body;

[0035] S2: first, the second mast is lifted, the bracket in the first mast is fixed with heightening seat, after the heightening seat is fixed, the second mast is lowered to the bottom, and the bottom of the second mast is seated on the heightening seat.

[0036] S3: the hydraulic rod of hydraulic cylinder is reinforced and locked, the connection plate is fixed on the eye plate on the both sides of the hydraulic rod wall, the connector is arranged on the bolt where the hydraulic cylinder flange is connected with transition flange, and the cable is fixed in sequence through the eye plate and the connector.

[0037] S4: Set up lifting points on the reinforcing structure at the bottom of the second mast, fix lifting lugs on both sides of the reinforcing structure, set up lifting rings on both sides of the transition flange, pass the chain hoist through the lifting lugs and the lifting rings in turn, disassemble the bolts between the transition flange and the second mast flange, separate the hydraulic cylinder body from the second mast, then separate the transition flange, tighten the chain hoist, and disassemble the two semicircles of the transition flange from both sides of the hydraulic cylinder and hoist them to the ground.

[0038] S5: Separate the hydraulic rod from the hydraulic cylinder fixing frame at the bottom of the first mast, and use an external crane to hoist the hydraulic rod out of the mast from above.

[0039] The inner diameter of the second mast flange is larger than the outer diameter of the hydraulic cylinder flange, ensuring that the hydraulic cylinder can be lifted out from the top. At the same time, two semicircular transition flanges are used between the hydraulic cylinder flange and the second mast flange to transfer the thrust, and two circles of bolts connect three layers of connecting plates to achieve the best of both worlds.

[0040] When the sail is in normal operation, the hydraulic cylinder supports the second mast and other lifting movable parts. When the hydraulic cylinder is retracted to the lowest stroke, the second mast is physically supported by the bracket welded inside the first mast. However, when disassembling the hydraulic cylinder, an additional support structure is needed to lift the second mast.

[0041] Therefore, a set of heightening seats are designed using the bracket inside the existing first mast, with fixing holes at the bottom to be bolted with the bracket. During the descent of the sail, the second mast can be lifted early when the hydraulic cylinder is not at the bottom of the stroke, providing a space guarantee for the disassembly and assembly of the hydraulic cylinder flange while providing strong support to the structure.

[0042] The disassembly and assembly of the hydraulic cylinder mainly occur inside the sail, and external lifting equipment cannot be used. In the design process, in order to ensure the structural strength, stability and safety, the weight of the heightening seat and the transition flange is 115kg and 144kg respectively, and the construction personnel cannot perform aerial manual work. Therefore, considering the narrow operation space and the disassembly and assembly requirements of the heightening seat and the transition flange, a set of portable structure design that meets all the lifting requirements is needed.

[0043] The lifting work mainly involves lifting the heightening seat or transition flange placed on the ground inside the slewing mechanism about 3m to the hydraulic cylinder flange for installation, so the lifting equipment of choice is a 2t lifting capacity chain hoist. The lifting points are selected on the side of the lower structure of the second mast, and according to the lifting requirements in four directions of the mast, a set of lifting lugs are selected, and corresponding lifting ring screw holes are added to the upper part of the transition flange and the heightening seat.

[0044] Before the preparation of hydraulic cylinder, the valve group and pipeline of the hydraulic cylinder rod end and the hydraulic cylinder are disconnected, and the hydraulic oil is discharged completely. In this state, the hydraulic cylinder body and the rod are not subjected to the pressure of the hydraulic oil, and become free. In order to lift the hydraulic cylinder from the top of the mast, a locking mechanism of the cylinder body and the rod is designed, which mainly includes the hydraulic cylinder body, bolts, a band, a connecting plate, a connecting piece, the hydraulic cylinder rod and a valve group fixing hole.

[0045] The connecting mechanism is fixed with the flange hole of the hydraulic cylinder body by using bolts and connecting pieces, the connecting plate is fixed through the valve group fixing hole, then the band is used to fix between the connecting piece and the connecting plate, and it is proved by calculation that the connecting end can meet the strength requirement.

[0046] In order to improve the maintainability of the hydraulic cylinder, a series of optimization design and analysis are carried out, which basically meets the hardware requirement of the structure, then according to the following hydraulic cylinder dismounting and installation process operation in the process of using the sail, the three-dimensional dismounting effect of the hydraulic cylinder can be realized.

[0047] Table 1 hydraulic cylinder dismounting process table in the process of using the sail

[0048]

[0049] Table 2 hydraulic cylinder installation process table in the process of using the sail

[0050]

[0051]

Claims

1. A method for dismantling a sail with a removable hydraulic cylinder component, characterized in that: A first mast is fixed on the sail base, a second mast is sleeved inside the first mast, and a hydraulic cylinder is installed inside the second mast. The hydraulic cylinder is equipped with a hydraulic cylinder flange. A hydraulic cylinder mounting bracket is fixed to the bottom of the first mast, and a reinforcing structure is fixed to the bottom of the second mast. A second mast flange is fixed below the reinforcing structure. The hydraulic cylinder has a hydraulic rod connected to the hydraulic cylinder mounting bracket. The cylinder body of the hydraulic cylinder passes through the reinforcing structure and is connected to the second mast flange. A transition flange is provided between the second mast flange and the hydraulic cylinder flange. The hydraulic cylinder flange, transition flange, and second mast flange are arranged sequentially from bottom to top and are fixed together by bolts. The transition flange is formed by the butt joint of two semi-circular flanges, and the outer diameter of the hydraulic cylinder flange is smaller than the inner diameter of the two-mast flange. The steps for disassembling the hydraulic cylinder are as follows: S1: A crane is installed outside the mast, and the crane is connected to the lifting lug of the hydraulic cylinder; S2: First, raise the second mast. A lifter is fixed to the bracket inside the first mast. After the lifter is fixed, lower the second mast to the bottom, and the bottom of the second mast rests on the lifter. S3: Connecting plates are symmetrically fixed on both sides of the hydraulic rod wall. Eye plates are fixed on the connecting plates. Connecting parts are provided on the bolts connecting the hydraulic cylinder flange and the transition flange. The cable passes through the eye plates and the connecting parts in sequence for fixing. S4: Set up lifting points on the reinforcing structure at the bottom of the second mast, fix lifting lugs on both sides of the reinforcing structure, set lifting rings on both sides of the transition flange, pass the hand chain hoist through the lifting lugs and lifting rings in sequence, remove the bolts between the transition flange and the second mast flange, separate the hydraulic cylinder body from the second mast, then separate the transition flange, tighten the hand chain hoist, and remove the two semicircles of the transition flange from both sides of the hydraulic cylinder and lift them to the ground. S5: Separate the hydraulic rod from the hydraulic cylinder mounting bracket at the bottom of the first mast, and use an external crane to lift the hydraulic cylinder out from above the mast.

2. The method for dismantling a sail with a detachable hydraulic cylinder component according to claim 1, characterized in that: The mast consists of a first mast, a second mast, and a third mast. The second mast is nested inside the first mast, and the third mast is nested inside the second mast.

3. The method for dismantling a sail with a detachable hydraulic cylinder component according to claim 1, characterized in that: The hydraulic cylinder flange and the inner edge of the transition flange are connected by bolts, and the second mast flange and the outer edge of the transition flange are connected by bolts.

4. The method for dismantling a sail with a detachable hydraulic cylinder component according to claim 1, characterized in that: Multiple heightening supports are provided along the circumference of the first mast, with spacing between them.

5. The method for dismantling a sail with a detachable hydraulic cylinder component according to claim 1, characterized in that: A transition flange is formed by bolting together two semi-circular flanges.

6. The method for dismantling a sail with a detachable hydraulic cylinder component according to claim 1, characterized in that: The riser seat and bracket are fixed together with bolts.

7. The method for dismantling a sail with a detachable hydraulic cylinder component according to claim 1, characterized in that: The hand chain hoist is a hand chain hoist with a lifting capacity of 2t.

8. The method for dismantling a sail with a removable hydraulic cylinder component according to claim 1, characterized in that: The stroke of the hydraulic cylinder is 10 meters.

9. A method for dismantling a sail with a removable hydraulic cylinder component according to claim 1, characterized in that: The weight of the transition flange is 144 kg.

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