Trimaran folding and unfolding mechanism based on scissor fork mechanism

Abstract

The trimaran folding and unfolding mechanism comprises a driving device and the shear fork mechanism, the shear fork mechanism comprises a first shear fork assembly and two second shear fork assemblies, the two second shear fork assemblies are located on the front side and the rear side of the lower portion of the first shear fork assembly, and the two ends of each shear fork assembly are connected with the outer wall of a dock and the top face of an auxiliary hull respectively; the driving device is used for driving the two second shear fork assemblies to be synchronously unfolded or folded, so that the first shear fork assemblies are passively unfolded or folded along with the second shear fork assemblies, and then the auxiliary ship body is switched between the unfolded state and the folded state. In an exhibition state, the top surfaces of the auxiliary hulls are horizontal; in the folded state, one part of the auxiliary hull is parked on a deck on the outer side of the dock, and the top face of the auxiliary hull is parallel to the outer wall of the dock. The triple-hulled vessel has the advantages of being large in folding and unfolding ratio, compact in structure and small in occupied space when folded, and therefore the auxiliary hulls can be close to a dock as much as possible in the folded state, the overall width of the triple-hulled vessel is reduced, and the trafficability and flexibility of the triple-hulled vessel are improved.

Description

Technical Field

[0001] This utility model relates to a trimaran launching and retracting mechanism, specifically a trimaran launching and retracting mechanism based on a scissor mechanism. Background Technology

[0002] CN109572921B discloses a hull-adjustable trimaran that uses an electric telescopic rod and two connecting rods to connect the hull to the side of the main hull's storage compartment. The electric telescopic rod allows the hull to rotate around the main hull, thus changing the overall width of the trimaran. In rough seas, extending the hull improves wave resistance and ensures navigation safety; in calm waters, retracting the hull reduces water resistance, increases speed, and lowers energy consumption. The technical problem with CN109572921B is that the extension / retraction mechanism, consisting of the electric telescopic rod and two connecting rods, has a relatively small extension / retraction ratio. Even when the electric telescopic rod is retracted to its shortest state, it still has a certain length, resulting in the hull being far from the storage compartment and the trimaran being relatively wide overall. This limits the trimaran's maneuverability and flexibility in port operations and transportation. Utility Model Content

[0003] Purpose of the utility model: The purpose of this utility model is to provide a trimaran deployment and retraction mechanism based on a scissor mechanism with a large retraction-to-expansion ratio.

[0004] Technical Solution: This utility model discloses a trimaran deployment and retraction mechanism based on a scissor mechanism, comprising a drive device and a scissor mechanism. The scissor mechanism includes a first scissor assembly and two second scissor assemblies, which are located below and to the front and rear of the first scissor assembly. Each scissor assembly is connected at both ends to the outer wall of the dock and the top surface of the auxiliary hull, respectively. The drive device is used to drive the two second scissor assemblies to deploy or fold synchronously, causing the first scissor assembly to be passively deployed or folded accordingly, thereby switching the auxiliary hull between a deployed state and a retracted state. In the deployed state, the top surface of the auxiliary hull is horizontal; in the retracted state, a portion of the auxiliary hull rests on the deck outside the dock with its top surface parallel to the outer wall of the dock.

[0005] Furthermore, the drive device includes a pair of first guide grooves fixed vertically at intervals to the outer wall of the dock, with the openings of the first guide grooves facing outwards; a main drive rod that can slide up and down under the drive of the drive source is provided on the two first guide grooves; a pair of second guide grooves are fixed horizontally at intervals along the width direction on the top surface of the auxiliary hull, with the openings of the second guide grooves facing upwards; and a passive rod is slidably provided on the two second guide grooves.

[0006] The second scissor lift assembly includes a first link, a fourth link, and a seventh link connected in sequence by hinges, and a fifth link, a sixth link, and an eighth link connected in sequence by hinges. The first link is hinged to the fifth link, the fourth link is hinged to the sixth link, and the seventh link is hinged to the eighth link. The ends of the first links of the two second scissor lift assemblies are respectively inserted into the two first guide groove slots and hinged to the ends of the main drive rods. The ends of the fifth links of the two second scissor lift assemblies are respectively hinged to the lower ends of the two first guide groove slots. The ends of the eighth links of the two second scissor lift assemblies are respectively inserted into the two second guide groove slots and hinged to the ends of the driven rods. The ends of the seventh links of the two second scissor lift assemblies are respectively hinged to the ends of the two second guide groove slots near the main hull.

[0007] Furthermore, each hinge point on one second scissor lift assembly is connected to a corresponding hinge point on another second scissor lift assembly by a synchronous link.

[0008] Furthermore, the first link and the fifth link are hinged together at their midpoints, and the fourth link and the sixth link are hinged together at their midpoints.

[0009] Furthermore, the first guide groove has elongated slots on both sides along its length that slide in a sliding fit with the end of the main drive rod.

[0010] Furthermore, the second guide groove has a second elongated slotted hole on both sides along its length direction that slides with the end of the passive rod.

[0011] Furthermore, the drive source is a hydraulic telescopic cylinder, which is fixed on the deck, and the output end of the hydraulic telescopic cylinder is fixedly connected to the main drive rod.

[0012] Furthermore, a first horizontal crossbar is fixed at the upper end between the two first guide chutes; a third horizontal crossbar is fixed at the end of the two second guide chutes away from the main hull; the first scissor lift assembly includes several X-shaped components, each X-shaped component including a second link and a third link that are crossed and hinged together; between adjacent X-shaped components, the second link of one X-shaped component is hinged to the third link of another X-shaped component, and the third link of one X-shaped component is hinged to the second link of another X-shaped component; the ends of the second and third links of the first X-shaped component are respectively hinged to two first pins fixed on the first horizontal crossbar; the ends of the second and third links of the last X-shaped component are respectively hinged to two third pins fixed on the third horizontal crossbar.

[0013] Furthermore, the second and third links are hinged together at their midpoints.

[0014] Beneficial effects: Compared with the prior art, this utility model has the following advantages: (1) The trimaran retraction and deployment mechanism based on the scissor mechanism of this utility model has the characteristics of a large retraction-to-expansion ratio. When retracted, the structure is compact and occupies little space; when deployed, the extension distance is far. Based on this, it can achieve the sub-hull to be as close to the dock as possible in the retracted state, reduce the overall width of the trimaran, and improve its passability and flexibility; at the same time, it meets the requirements of the sub-hull being exposed to water. (2) This utility model has the advantages of good stability and high support stiffness, and can meet the requirements of resisting wave disturbance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the trimaran launching and retracting mechanism based on the scissor mechanism, which connects the main hull and the auxiliary hull, provided by this utility model.

[0016] Figure 2 This is a schematic diagram of the drive device in an embodiment of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure in which the drive device is installed on the side of the dock of the main hull in an embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the scissor mechanism in an embodiment of this utility model;

[0019] Figure 5 This is a schematic diagram of the sub-hull structure in an embodiment of this utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the trimaran launching and retracting mechanism based on the scissor mechanism provided in this embodiment of the utility model;

[0021] Figure 7 This is a schematic diagram of a single-sided auxiliary hull switching from an extended state to a retracted state in an embodiment of this utility model;

[0022] Figure 8 This is a schematic diagram of the two auxiliary hulls in the unfolded state in an embodiment of this utility model;

[0023] Figure 9 This is a schematic diagram of the two auxiliary hulls in the retracted state in an embodiment of this utility model. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] 1. Main hull; 11. Dry dock;

[0026] 2. Drive unit; 221 / 222, first pin; 231 / 232, first guide groove; 241, first horizontal crossbar; 242, main drive rod;

[0027] 3. Scissor lift mechanism; 311 / 312, first link; 321, second link; 322, third link; 33, synchronizing link; 341 / 342, fourth link; 351 / 352, fifth link; 361 / 362, sixth link;

[0028] 4. Subhub; 431 / 432. Seventh Link; 441 / 442. Eighth Link; 451 / 452. Second Guide Slide; 46. Second Horizontal Crossbar; 471 / 472. Third Pin; 48. Third Horizontal Crossbar; 49. Passive Link.

[0029] like Figure 1 As shown, this utility model embodiment provides a trimaran launching and retracting mechanism based on a scissor mechanism, including a drive device 2 and a scissor mechanism 3.

[0030] like Figure 2 and Figure 3 As shown, the drive device 2 includes a first guide groove 231 and a first guide groove 232 vertically spaced and fixed to the outer wall of the dock 11 of the main hull 1, with the openings of the first guide grooves facing outwards. A second pin is fixed to the lower end of each of the two first guide grooves. A main drive rod 242, capable of sliding up and down under the drive of a drive source, is provided on each of the two first guide grooves. Specifically, first elongated slotted holes are formed on both sides of the first guide groove along its length direction, which slide and engage with the ends of the main drive rod 242. In this embodiment, the drive source is a hydraulic telescopic cylinder, which is fixed to the deck, and its output end is fixedly connected to the main drive rod 242. A first horizontal crossbar 241 is fixed at the upper end between the two first guide grooves, and a first pin 221 and a first pin 222 are fixed on the first horizontal crossbar 241.

[0031] like Figure 5 and Figure 6 As shown, the top surface of the auxiliary hull 4 is horizontally spaced with second guide grooves 451 and 452 along its width direction, with the openings of the second guide grooves facing upwards. A second horizontal crossbar 46 is fixed between the two second guide grooves at the end closer to the main hull 1, and a third horizontal crossbar 48 is fixed between the two second guide grooves at the end farther from the main hull 1. A third pin 471 and a third pin 472 are fixed on the third horizontal crossbar 48. A passive rod 49 is slidably mounted on the two second guide grooves. Similarly, second elongated slotted holes are formed on both sides of the second guide grooves along their length direction, which slide and engage with the ends of the passive rods 49.

[0032] The scissor mechanism 3 includes a first scissor assembly and two second scissor assemblies, with the two second scissor assemblies located below and on the front and rear sides of the first scissor assembly.

[0033] Combination Figure 4The first scissor lift assembly includes three X-shaped members, each comprising a second link 321 and a third link 322 arranged in a cross configuration, hinged together at their midpoint. Between adjacent X-shaped members, the second link 321 of one X-shaped member is hinged to the third link 322 of another, and vice versa. The ends of the second link 321 and third link 322 of the first X-shaped member are respectively hinged to two first pins fixedly mounted on the first horizontal crossbar 241. The ends of the second link 321 and third link 322 of the last X-shaped member are respectively hinged to two third pins fixedly mounted on the third horizontal crossbar 48.

[0034] The two second scissor components have the same structure. The following explanation uses one second scissor component as an example.

[0035] The second scissor lift assembly includes a first link 311, a fourth link 341, and a seventh link 431 that are hinged together in sequence, as well as a fifth link 351, a sixth link 361, and an eighth link 441 that are hinged together in sequence. The first link 311 and the fifth link 351 are hinged together at their midpoints, the fourth link 341 and the sixth link 361 are hinged together at their midpoints, and the seventh link 431 and the eighth link 441 are hinged together.

[0036] The ends of the first links of the two second scissor lift assemblies are respectively inserted into the two first guide groove slots and hinged to the ends of the main drive rod 242. The ends of the fifth links of the two second scissor lift assemblies are respectively inserted into the two first guide groove slots and hinged to the second pins, forming a single revolute joint that swings axially, limiting excess displacement. The ends of the eighth links of the two second scissor lift assemblies are respectively inserted into the two second guide groove slots and hinged to the ends of the driven rod 49. The ends of the seventh links of the two second scissor lift assemblies are respectively inserted into the two second guide groove slots and hinged to the ends of the second horizontal crossbar 46.

[0037] To ensure that the two second scissor lift assemblies operate synchronously, a synchronizing link 33 is connected between each hinge point on one second scissor lift assembly and the corresponding hinge point on the other second scissor lift assembly. The two ends of the synchronizing link 33 are respectively embedded in the two through holes, and a coaxial hinge is formed by the cooperation of the rotating pair.

[0038] The degree of freedom calculation for the trimaran launching and recovering mechanism based on the scissor mechanism is based on the GK formula:

[0039] F = 3n - 2j - h

[0040] Where F is the degree of freedom of the mechanism, n is the number of moving parts (excluding the frame), j is the number of lower pairs (revolute pairs and prismatic pairs), and h is the number of higher pairs.

[0041] For a single-sided scissor lift mechanism, the number of moving parts n is 9 (7 connecting rods and 2 sliders), the number of lower pairs j is 13 (11 revolute pairs and 2 prismatic pairs), and the number of higher pairs h = 0. Substituting these values ​​into the formula, we can obtain:

[0042] F = 3 × 9 - 2 × 13 - 0 = 1

[0043] The overall scissor lift mechanism has 1 degree of freedom, which conforms to the single-degree-of-freedom drive principle.

[0044] The working principle of this utility model is as follows:

[0045] like Figure 7 As shown, the linear power generated by the extension and retraction of the hydraulic telescopic cylinder is transmitted to the main drive rod 242. Under the action of hydraulic driving force, the main drive rod 242 moves along the length direction of the first guide groove, converting the linear power into the retraction motion of the scissor mechanism 3. The passive rod 49 moves linearly along the second guide grooves 451 and 452. The connecting rods 431 and 432, etc., work together to complete the retraction action of the auxiliary hull 4, and the connecting rods 321 and 322 also retract synchronously with the overall mechanism, assisting the auxiliary hull 4 to move closer to the main hull 1. As the hydraulic telescopic cylinder continues to operate, the scissor mechanism 3 gradually folds, and the auxiliary hull 4 continuously retracts towards the main hull 1 until it is completely retracted.

[0046] The deployment of auxiliary hull 4 is the reverse operation of recovery.

[0047] The retraction range of the auxiliary hull 4 is directly related to the geometric parameters of the scissor mechanism 3. When the scissor mechanism 3 is fully retracted, the minimum retracted length is approximately 0.46m; when fully extended, the maximum retracted length is approximately 5.02m, with a retraction rate of 90.8% (the formula for calculating the retraction rate is: η = (L...). max -L min) / L max ×100%). The retractable length of the first scissor lift assembly is determined by the angle θ (range 4° < θ < 50°) between the second link 321, the third link 322 and the hull. The formula for calculating the retractable length is the length of the scissor lift rod, which can achieve an auxiliary support range of 753 to 8273 mm.

[0048] After the auxiliary hull 4 is retracted, half of it rests on the deck of the main hull 1. The widest part of the main hull 1 deck is 7.3m, the widest part of the auxiliary hull 4 is 2.1m, the dock 11 is 3.5m wide, and 1.9m of space is reserved on each side of the dock 11. After deducting the minimum retraction distance of 0.46m, the remaining 1.44m is used as the storage space for the auxiliary hull 4, ensuring a compact structure after retraction.

[0049] Although the above technical solution only describes the connection between a single auxiliary hull 4 and the main hull 1, it is easy to understand that both auxiliary hulls 4 can be connected to the main hull 1 using the trimaran deployment and retraction mechanism provided by this utility model. For example... Figure 8 and Figure 9 The two auxiliary hulls 4 are shown in their deployed and retracted states, respectively.

Claims

1. A trimaran launching and retraction mechanism based on a scissor mechanism, characterized in that, It includes a drive unit (2) and a scissor mechanism (3). The scissor mechanism (3) includes a first scissor assembly and two second scissor assemblies. The two second scissor assemblies are located on the front and rear sides below the first scissor assembly. The two ends of each scissor assembly are respectively connected to the outer wall of the dock (11) and the top surface of the sub-hull (4). The drive unit (2) is used to drive the two second scissor assemblies to extend or fold synchronously, so that the first scissor assembly is passively extended or folded, thereby switching the sub-hull (4) between the extended state and the retracted state; in the extended state, the top surface of the sub-hull (4) is horizontal; in the retracted state, a part of the sub-hull (4) is placed on the deck outside the dock (11) and the top surface of the sub-hull (4) is parallel to the outer wall of the dock (11).

2. The trimaran launching and retraction mechanism based on a scissor mechanism according to claim 1, characterized in that, The drive unit (2) includes a pair of first guide grooves that are vertically spaced and fixed to the outer wall of the dock (11), with the openings of the first guide grooves facing outwards; the two first guide grooves are provided with main drive rods (242) that can slide up and down under the drive of the drive source; the top surface of the sub-hull (4) is horizontally spaced and fixed with a pair of second guide grooves along its width direction, with the openings of the second guide grooves facing upwards; the two second guide grooves are slidably provided with passive rods (49); The second scissor lift assembly includes a first link, a fourth link, and a seventh link that are hinged together in sequence, and a fifth link, a sixth link, and an eighth link that are hinged together in sequence; the first link is hinged to the fifth link, the fourth link is hinged to the sixth link, and the seventh link is hinged to the eighth link; the ends of the first links of the two second scissor lift assemblies are respectively inserted into the two first guide groove slots and hinged to the ends of the main drive rod (242); the ends of the fifth links of the two second scissor lift assemblies are respectively hinged to the lower ends of the two first guide groove slots; the ends of the eighth links of the two second scissor lift assemblies are respectively inserted into the two second guide groove slots and hinged to the ends of the passive rod (49); the ends of the seventh links of the two second scissor lift assemblies are respectively hinged to the ends of the two second guide groove slots near the main hull (1).

3. The trimaran launching and retraction mechanism based on a scissor mechanism according to claim 2, characterized in that, Each hinge point on one second scissor lift assembly is connected to a corresponding hinge point on another second scissor lift assembly by a synchronous link (33).

4. The trimaran launching and retraction mechanism based on a scissor mechanism according to claim 2, characterized in that, The first link and the fifth link are hinged together at their midpoints, and the fourth link and the sixth link are hinged together at their midpoints.

5. The trimaran launching and retraction mechanism based on a scissor mechanism according to claim 2, characterized in that, The first guide groove has a first elongated slotted hole on both sides along its length direction, which slides and engages with the end of the main drive rod (242).

6. The trimaran launching and retraction mechanism based on a scissor mechanism according to claim 2, characterized in that, The second guide groove has a second elongated slotted hole on both sides along its length direction, which slides and engages with the end of the passive rod (49).

7. The trimaran launching and retraction mechanism based on a scissor mechanism according to claim 2, characterized in that, The drive source is a hydraulic telescopic cylinder, which is fixed on the deck and the output end of the hydraulic telescopic cylinder is fixedly connected to the main drive rod (242).

8. The trimaran launching and retraction mechanism based on a scissor mechanism according to any one of claims 2 to 7, characterized in that, A first horizontal crossbar (241) is fixed at the upper end between the two first guide slides; a third horizontal crossbar (48) is fixed at the end of the two second guide slides away from the main hull (1); the first scissor lift assembly includes several X-shaped components, each X-shaped component including a second connecting rod (321) and a third connecting rod (322) that are crossed and hinged together; between adjacent X-shaped components, the second connecting rod (321) of one X-shaped component is hinged to the third connecting rod (322) of another X-shaped component, and the third connecting rod (322) of one X-shaped component is hinged to the second connecting rod (321) of another X-shaped component; the ends of the second connecting rod (321) and the third connecting rod (322) of the first X-shaped component are respectively hinged to two first pins fixed on the first horizontal crossbar (241); the ends of the second connecting rod (321) and the third connecting rod (322) of the last X-shaped component are respectively hinged to two third pins fixed on the third horizontal crossbar (48).

9. The trimaran launching and retraction mechanism based on a scissor mechanism according to claim 8, characterized in that, The second link (321) and the third link (322) are hinged together at the middle position.

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