A new multi-link folding mechanism

Abstract

The application discloses a novel multi-connecting rod folding mechanism, which comprises three fixed supports not on the same straight line, and the three fixed supports are respectively provided with hinge points A, B and C, characterized in that the hinge point A is hingedly connected with an extension rod, the hinge point B is hingedly connected with a triangular rod, and the hinge point C is hingedly connected with a main folding rod; the triangular rod is provided with hinge points B, D and E in a triangular distribution; the front end of the extension rod is hingedly connected with the hinge point B; the hinge point E is a movable hinge point and can move along the main folding rod; a connecting rod is hingedly connected with the hinge point E; the other end of the connecting rod is hingedly connected with a swing rod at a hinge point F; the other end of the swing rod is hingedly connected with the hinge point H at the front end of the main folding rod; the hinge point F is a movable hinge point and can move along a sub folding rod; and the sub folding rod is hingedly connected with the hinge point G at the front end of the main folding rod.

Description

Technical Field

[0001] This invention relates to the field of machinery, and more specifically to a multi-link mechanism. Background Technology

[0002] In the field of mechanics, linkage mechanisms are often used to achieve shape changes. For example, some mechanisms on special vehicles need to be folded up when not in use, but need to be unfolded to the working state in special circumstances.

[0003] Using a single actuator to unfold or retract a link is a common linkage structure. However, for more complex folding requirements, the linkage mechanism needs to be redesigned. When both folding and flipping functions are required simultaneously, existing technologies lack simple and effective linkage mechanisms. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: how to simultaneously realize the mechanism flipping and the mechanism folding.

[0005] The technical solution of this invention:

[0006] A novel multi-link folding mechanism includes three fixed supports not on the same straight line. Each fixed support has hinge points A, B, and C. Hinge point A is hinged to a telescopic rod, hinge point B is hinged to a triangular rod, and hinge point C is hinged to a main folding rod. The triangular rod has hinge points B, D, and E arranged in a triangle. The front end of the telescopic rod is hinged to hinge point B. Hinge point E is a movable hinge point that can move along the main folding rod. A connecting rod is hinged to hinge point E, and the other end of the connecting rod is hinged to a swing rod at hinge point F. The other end of the swing rod is hinged to hinge point H at the front end of the main folding rod. Hinge point F is a movable hinge point that can move along a secondary folding rod, which is hinged to hinge point G at the front end of the main folding rod.

[0007] Hinge points C, E, and G are located on the same straight line. Hinge point H is located below this straight line, while hinge points A, B, D, and F are located above this straight line.

[0008] When the telescopic pole extends, the main folding rod flips downwards, and the angle between the main folding rod and the secondary folding rod decreases; when the telescopic pole shortens, the main folding rod flips upwards, and the angle between the main folding rod and the secondary folding rod increases.

[0009] The triangular rod is either a single plate-like structure or composed of three rods hinged together.

[0010] Two sets of folding mechanisms are arranged in parallel with a baffle installed in the middle. Two parallel main folding rods serve as the sides of one baffle, and two parallel secondary folding rods serve as the sides of the second baffle.

[0011] The lower folding rod is hinged at hinge point M on the lower side of the main folding rod.

[0012] A fixed point N is provided below the hinge point C, and the lower folding rod always maintains its engagement with the fixed point N during the movement.

[0013] For hinge points B, C, and fixed point N, the angle between line BC and the vertical plane is greater than the angle between line CN and the vertical plane.

[0014] Two folding mechanisms are arranged in parallel, and a baffle is installed between the two lower folding rods.

[0015] The main folding rod, the secondary folding rod, and the lower folding rod have sliding grooves and sliding pins are installed in the sliding grooves. Hinge point E is connected to the sliding pin of the main folding rod, hinge point F is connected to the sliding pin of the secondary folding rod, and the sliding pin of the lower folding rod is connected to the fixed point N.

[0016] The beneficial effects of this invention are:

[0017] This invention enables the unfolding and folding of a two-bar linkage using a single active component. In the folded state, the mechanism is folded and drooping; when unfolded, it simultaneously flips to its working position. Furthermore, a third link is added to achieve synchronous folding and flipping of the three-bar linkage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the linkage structure in Example 1.

[0019] Figure 2 This is a schematic diagram showing the wave deflector in its retracted state.

[0020] Figure 3 This is a schematic diagram of the wave deflector in its deployed state.

[0021] Figure 4 This is a schematic diagram of the linkage structure in Example 2.

[0022] Figure 5 This is a schematic diagram of the retracted state of the linkage in Example 2.

[0023] Figure 6 This is a schematic diagram of the linkage in the deployed state in Example 2. Detailed Implementation

[0024] Example 1:

[0025] like Figure 1 A novel multi-link folding mechanism includes three fixed supports that are not on the same straight line. The three fixed supports have hinge points A, B and C respectively. A rectangular coordinate system is established with hinge point C as the origin. Hinge point A is located in the fourth quadrant and hinge point B is located in the first quadrant.

[0026] Telescopic rods are hinged at hinge points A and D, a triangular rod is hinged at hinge point B, and a main folding rod is hinged at hinge point C. The triangular rod has hinge points B, D, and E arranged in a triangle. The front end of the telescopic rod is hinged at hinge point B. Hinge point E is a movable hinge point that can move along the main folding rod. A connecting rod is hinged at hinge point E, and the other end of the connecting rod is hinged to a swing rod at hinge point F. The other end of the swing rod is hinged at hinge point H at the front end of the main folding rod. Hinge point F is a movable hinge point that can move along the secondary folding rod, which is hinged at hinge point G at the front end of the main folding rod.

[0027] Hinge points C, E, and G are located on the same straight line. Hinge point H is located below this straight line, while hinge points A, B, D, and F are located above this straight line.

[0028] Furthermore, a third folding rod is added: the lower folding rod is hinged at hinge point M on the lower side of the main folding rod. Hinge point M is located below the straight line CEG and close to hinge point C.

[0029] A fixed point N is provided below the hinge point C, and the lower folding rod always maintains its engagement with the fixed point N during the movement.

[0030] For hinge points B, C, and fixed point N, the angle between line BC and the vertical plane is greater than the angle between line CN and the vertical plane.

[0031] When the telescopic pole extends, the main folding rod flips downwards, and the angle between the main folding rod and the secondary folding rod decreases; when the telescopic pole shortens, the main folding rod flips upwards, and the angle between the main folding rod and the secondary folding rod increases.

[0032] When the telescopic pole is extended to its maximum length, the main folding pole and the secondary folding pole overlap and hang down, at which point the angle between the lower folding pole and the main folding pole reaches its minimum. When the telescopic pole is at its shortest length, the main folding pole and the secondary folding pole unfold into a straight line, and the angle between the lower folding pole and the main folding pole reaches its maximum.

[0033] The triangular rod is either a single plate-like structure or composed of three rods hinged together.

[0034] Two folding mechanisms are arranged in parallel with three baffles installed in the middle. Two parallel main folding rods form the edges of one baffle, two parallel secondary folding rods form the edges of the second baffle, and two lower folding rods form the edges of the third baffle.

[0035] The main folding rod, the secondary folding rod, and the lower folding rod have sliding grooves and sliding pins are installed in the sliding grooves. Hinge point E is connected to the sliding pin of the main folding rod, hinge point F is connected to the sliding pin of the secondary folding rod, and the sliding pin of the lower folding rod is connected to the fixed point N.

[0036] This linkage structure can be applied to wave deflector structures on vehicles, such as... Figure 2 and Figure 3A folding mechanism is installed on each side of the front of the vehicle, with the telescopic rods being hydraulic cylinders. There are three wave deflectors. The two sides of the main wave deflector serve as the main folding rods of the folding mechanism. The front end of the main wave deflector is hinged to the secondary wave deflector, and the lower side of the main wave deflector is hinged to the lower wave deflector. The three wave deflectors are retracted and deployed by the extension and retraction of the hydraulic cylinders.

[0037] Example 2:

[0038] Structural Description: This invention consists of a telescopic rod 1 with a length of... l 1. Fixed hinge point; 2. Hinge point; 3. Rod 4, length is... l 2. The length of member 5 is l 3. Fixed hinge point 6, length of rod 7 is l 4. Fixed hinge point 8, rod 9, fixed hinge point 10, rod 11, hinge point 12, sliding hinge point 13, hinge point 14, rod 15, connecting rod 16 (length is...) l 5. The lengths of sliding hinge point 17, hinge point 18, and connecting rod 19 are: l Composed of 6, such as Figure 1 As shown. Among them, rods 4, 5, and 7 form a structurally stable triangle, and the length between hinge point 14 and sliding hinge point 13 is... l 7. The length between fixed hinge point 8 and fixed hinge point 6 is l 8. The length between fixed hinge point 8 and sliding hinge point 13 is l 9. The length between fixed hinge point 8 and fixed hinge point 10 is l 10 The length between fixed hinge point 10 and hinge point 12 is l 11 The length between fixed hinge point 2 and fixed hinge point 6 is l 12 The length between fixed hinge point 8 and hinge point 12 is l 13 The length between hinge point 14 and sliding hinge point 17 is l 14 The length between sliding hinge point 13 and hinge point 18 is l 15 The length of member 11 is l 9 and l The sum of 7, hinge point 12 and hinge point 18 are fixed on rod 11 (including hinge point 12, hinge point 18 and rod 11 being collinear).

[0039] Explanation of the principle:

[0040] The length of telescopic rod 1 is l 1. The length of member 5 is l 3. The length between fixed hinge point 2 and fixed hinge point 6 is l 12 Forming triangle 101, in which l1. Length is variable, satisfying l 1+ l 3> l 12 , l 12 + l 3> l 1. l 1+ l 12 > l 3; The length of member 4 is l 2. The length of member 5 is l 3. The length of member 7 is l 4. Forming a stable triangle 102, triangles 101 and 102 share a side that is the length of member 5. l 3; The length of member 7 is l 4. The length between fixed hinge point 8 and fixed hinge point 6 is l 8. The length between fixed hinge point 8 and sliding hinge point 13 is l 9 form a triangle 103, in which l 9. Length is variable, satisfying l 4+ l 8> l 9. l 8+ l 9> l 4. l 4+ l 9> l 8. Triangles 102 and 103 share a side called rod 7, with a length of [missing information]. l 4; The length between fixed hinge point 8 and hinge point 12 is l 13 The length between fixed hinge point 10 and hinge point 12 is l 11 The length between fixed hinge point 8 and fixed hinge point 10 is l 10 Forming a triangle 104, in which l 11 and l 13 Variable length, satisfying l 10 + l 11 > l 13 , l 10 + l 13 > l 11 , l 11 + l 13 >l 10 The sides of triangle 103 l 9 and the side of triangle 104 l 13 Collinear; Link 16 has a length of l 5. The length of connecting rod 19 is l 6. The length between hinge point 18 and sliding hinge point 13 is l 15 Forming a triangle 105, where l 15 Variable length, satisfying l 5+ l 15 > l 6. l 5+ l 6> l 15 , l 15 + l 6> l 5; the length of link 16 is l 5. The length between hinge point 14 and sliding hinge point 17 is l 14 The length between hinge point 14 and sliding hinge point 13 is l 7 form a triangle of 106, where l 7. l 14 Variable length, satisfying l 5+ l 14 > l 7. l 5+ l 7> l 14 , l 14 + l 7> l 5. The sides of triangle 103 l 9. The sides of triangle 104 l 13 The sides of triangle 106 l 7 collinear, sides of triangle 105 l 5 and the side of triangle 106 l 5. Shared sides.

[0041] therefore, l When the length changes, triangle 101 drives triangle 102 to rotate and move, triangle 102 drives triangle 103 to rotate and move, and triangles 103, 104, 105 and 106 work together to realize the folding function of the entire mechanism.

[0042] Action description:

[0043] During the overall mechanism's deployment, telescopic member 1 retracts. l 1. The change in length of triangle 101 causes triangle 102 to rotate and move; triangle 102 is structurally stable, and its length is determined by the length of rod 7. l 4 causes triangle 103 to rotate and move; through collinear sides l 9. The length change, i.e., the rod 11, drives the linkage of triangles 104, 105, and 106, that is, it drives the sides of triangle 104. l 11 and l 13 The sides of triangle 105 l 15 Variations, sides of triangle 106 l 7. l 14 Changes enable the entire mechanism to fold (e.g.) Figure 5 During the overall mechanism's contraction process, the movements of each component are opposite (e.g., Figure 6 ).

Claims

1. A new multi-link folding mechanism, comprising three fixed supports which are not in the same straight line, and three hinge points A, B and C on the three fixed supports respectively, characterized in that: Hinge point A is a hinge telescopic rod, hinge point B is a hinge triangular rod, hinge point C is a hinge main folding rod, the triangular rod has hinge points B, D and E distributed in a triangle, the telescopic rod is hinged at the front end of hinge point B, hinge point E is a movable hinge point and can move along the main folding rod, a connecting rod is hinged at hinge point E, the other end of the connecting rod is hinged at hinge point F of a swing rod, the other end of the swing rod is hinged at hinge point H at the front end of the main folding rod; hinge point F is a movable hinge point and can move along a sub folding rod, the sub folding rod is hinged at hinge point G at the front end of the main folding rod, a lower folding rod is hinged at hinge point M at the lower side of the main folding rod, hinge point C is provided with a fixed point N at the lower side, the lower folding rod always cooperates with the fixed point N during movement, for hinge points B, C and the fixed point N, the included angle of line BC with respect to the vertical plane is greater than the included angle of line CN with respect to the vertical plane, the two sets of folding mechanisms are arranged in parallel, and a baffle is installed between the two lower folding rods.

2. The novel multi-link folding mechanism according to claim 1, characterized in that: Hinge points C, E and G are located on the same straight line, hinge point H is located below the straight line, and hinge points A, B, D and F are located above the straight line.

3. The novel multi-link folding mechanism according to claim 2, characterized in that: When the telescopic rod is lengthened, the main folding rod is turned downward, and the included angle between the main folding rod and the sub folding rod is reduced; when the telescopic rod is shortened, the main folding rod is turned upward, and the included angle between the main folding rod and the sub folding rod is increased.

4. The novel multi-link folding mechanism according to claim 1, wherein: The triangular rod is an integral plate structure or is formed by hinging three rods.

5. The novel multi-link folding mechanism according to claim 1, wherein: The two sets of folding mechanisms are arranged in parallel and a baffle is installed therebetween, the two parallel main folding rods serve as edges of a baffle, and the two parallel sub folding rods serve as edges of a second baffle.

6. The novel multi-link folding mechanism according to claim 1, wherein: The main folding rod, the sub folding rod and the lower folding rod are provided with sliding grooves and sliding pins are installed in the sliding grooves, hinge point E and the sliding pin of the main folding rod are connected, hinge point F and the sliding pin of the sub folding rod are connected, and the sliding pin of the lower folding rod is connected with the fixed point N.

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