Novel multi-connecting-rod folding mechanism

Abstract

The invention discloses a novel multi-connecting-rod folding mechanism which comprises three fixed supports which are not located on the same straight line and are respectively provided with a hinge point A, a hinge point B and a hinge point C. The novel multi-connecting-rod folding mechanism is characterized in that the hinge point A is hinged with a telescopic rod, the hinge point B is hinged with a triangular rod, the hinge point C is hinged with a main folding rod, the triangular rod is provided with the hinge point B, the hinge point D and the hinge point E which are distributed in a triangular mode, and the main folding rod is hinged with the main folding rod. The front end of the telescopic rod is hinged to a hinge point B, a hinge point E is a movable hinge point and can move along the main folding rod, a connecting rod is hinged to the hinge point E, the other end of the connecting rod and a swing rod are hinged to a hinge point F, and the other end of the swing rod is hinged to a 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 the auxiliary folding rod, and the auxiliary folding rod is hinged to the hinge point G at the front end of the main folding rod. According to the folding mechanism, unfolding and folding of the connecting rod mechanism are completed through one driving part, the mechanism is folded and droops in the folding state, and the mechanism is overturned to the working position while being unfolded.

Description

Technical Field

[0001] The invention relates to the field of machinery, and in particular to a multi-link mechanism. Background Art

[0002] In the field of mechanics, it is usually necessary to use a connecting rod mechanism 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 a working state in special circumstances.

[0003] Using a driving member to unfold or fold a rod is a common connecting rod structure. For more complex folding requirements, the connecting rod mechanism must be redesigned. When it is necessary to achieve folding and flipping functions at the same time, the existing technology lacks a simple and effective connecting rod mechanism. Summary of the invention

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

[0005] The technical solution of the present invention:

[0006] A novel multi-link folding mechanism includes three fixed supports that are not on the same straight line. The three fixed supports are respectively provided with hinge points A, B and C. Hinge point A is hinged with a telescopic rod, hinge point B is hinged with a triangular rod, and hinge point C is hinged with a telescopic rod.

[0007] The main folding rod is hinged, and there are hinge points B, D and E distributed in a triangle on the triangular rod. The front end of the telescopic rod is hinged at hinge point B, hinge point E is a movable hinge and can move along the main folding rod, and a connecting rod is hinged on hinge point E. The other end of the connecting rod is hinged to the swing rod at hinge point F, and 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 and can move along the auxiliary folding rod, and the auxiliary folding rod is hinged to hinge point G at the front end of the main folding rod.

[0008] Hinge point C, hinge point E and hinge point G are located on the same straight line, hinge point H is located below the straight line, and hinge point A, hinge point B, hinge point D and hinge point F are located above the straight line.

[0009] When the telescopic rod is extended, the main folding rod flips downward, and the angle between the main folding rod and the auxiliary folding rod decreases; when the telescopic rod is shortened, the main folding rod flips upward, and the angle between the main folding rod and the auxiliary folding rod increases.

[0010] The triangular rod is an integral plate-shaped structure, or is formed by hingedly connecting three rods.

[0011] The 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 auxiliary folding rods serve as the sides of the second baffle.

[0012] The lower folding rod is hinged at the lower hinge point M of the main folding rod.

[0013] A fixed point N is arranged at the lower side of the hinge point C, and the lower folding rod always keeps in cooperation with the fixed point N during the movement.

[0014] For the hinge point B, the hinge point C and the fixed point N, the angle between the line BC and the vertical plane is greater than the angle between the line CN and the vertical plane.

[0015] The two sets of folding mechanisms are arranged in parallel, and a baffle is installed between the two lower folding rods.

[0016] The main folding rod, the auxiliary folding rod and the lower folding rod are provided with slide grooves and slide pins are installed in the slide grooves. The hinge point E is connected to the slide pin of the main folding rod, the hinge point F is connected to the slide pin of the auxiliary folding rod, and the slide pin of the lower folding rod is connected to the fixed point N.

[0017] Beneficial effects of the present invention:

[0018] The present invention realizes the unfolding and folding of the two-link mechanism by using one active member, so that the mechanism folds and droops in the folded state, and the mechanism also flips to the working position when unfolded. Further, a third link is added to realize the synchronous folding and flipping of the three links. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the connecting rod structure principle of Example 1.

[0020] Figure 2 This is a schematic diagram of the wave-breaking board retracted state.

[0021] Figure 3 This is a schematic diagram of the unfolded state of the wave-breaking board.

[0022] Figure 4 Schematic diagram of the connecting rod structure principle of Example 2.

[0023] Figure 5 This is a schematic diagram of the connecting rod retracted state of Example 2.

[0024] Figure 6 This is a schematic diagram of the connecting rod in the expanded state of Example 2. DETAILED DESCRIPTION

[0025] Embodiment 1:

[0026] like Figure 1 A novel multi-link folding mechanism includes three fixed supports which are not on the same straight line. The three fixed supports are respectively provided with hinge points A, hinge points B and hinge points C. 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.

[0027] The telescopic rod is hinged on hinge point A and hinge point D, the triangular rod is hinged on hinge point B, and the main folding rod is hinged on hinge point C. The triangular rod has hinge points B, D and E distributed in a triangle. The front end of the telescopic rod is hinged on hinge point B. Hinge point E is a movable hinge and can move along the main folding rod. A connecting rod is hinged on hinge point E. 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 and can move along the secondary folding rod. The secondary folding rod is hinged to hinge point G at the front end of the main folding rod.

[0028] Hinge point C, hinge point E and hinge point G are located on the same straight line, hinge point H is located below the straight line, and hinge point A, hinge point B, hinge point D and hinge point F are located above the straight line.

[0029] Furthermore, a third folding rod is added: a lower folding rod is hinged at a lower hinge point M of the main folding rod. The hinge point M is located below the straight line CEG and close to the hinge point C.

[0030] A fixed point N is arranged at the lower side of the hinge point C, and the lower folding rod always keeps in cooperation with the fixed point N during the movement.

[0031] For the hinge point B, the hinge point C and the fixed point N, the angle between the line BC and the vertical plane is greater than the angle between the line CN and the vertical plane.

[0032] When the telescopic rod is extended, the main folding rod flips downward, and the angle between the main folding rod and the auxiliary folding rod decreases; when the telescopic rod is shortened, the main folding rod flips upward, and the angle between the main folding rod and the auxiliary folding rod increases.

[0033] When the telescopic rod is extended to the longest, the main folding rod and the auxiliary folding rod are stacked together and drooped, and the angle between the lower folding rod and the main folding rod reaches the minimum. When the telescopic rod is extended to the shortest, the main folding rod and the auxiliary folding rod are unfolded into a straight line, and the angle between the lower folding rod and the main folding rod reaches the maximum.

[0034] The triangular rod is an integral plate-shaped structure, or is formed by hingedly connecting three rods.

[0035] The two sets of folding mechanisms are arranged in parallel and three baffles are installed in the middle, two parallel main folding rods serve as the edge of one baffle, two parallel auxiliary folding rods serve as the edge of the second baffle, and two lower folding rods serve as the edge of the third baffle.

[0036] The main folding rod, the auxiliary folding rod and the lower folding rod are provided with slide grooves and slide pins are installed in the slide grooves. The hinge point E is connected to the slide pin of the main folding rod, the hinge point F is connected to the slide pin of the auxiliary folding rod, and the slide pin of the lower folding rod is connected to the fixed point N.

[0037] The connecting rod structure is applied to the anti-wave plate structure on the vehicle, such as Figure 2 and Figure 3A folding mechanism is installed on each side of the front of the vehicle, and the telescopic rod is a cylinder. There are three wave-breaking boards, and the two sides of the main wave-breaking board serve as the main folding rods of the folding mechanism. The front end of the main wave-breaking board is hinged to the auxiliary wave-breaking board, and the lower side of the main wave-breaking board is hinged to the lower wave-breaking board. The three wave-breaking boards can be folded and unfolded by the telescopic cylinder.

[0038] Embodiment 2:

[0039] Structural description: The present invention is composed of a telescopic rod 1 with a length of l1, a fixed hinge 2, a hinge 3, a rod 4 with a length of l2, a rod 5 with a length of l3, a fixed hinge 6, a rod 7 with a length of l4, a fixed hinge 8, a rod 9, a fixed hinge 10, a rod 11, a hinge 12, a sliding hinge 13, a hinge 14, a rod 15, a connecting rod 16 with a length of l5, a sliding hinge 17, a hinge 18, and a connecting rod 19 with a length of l6. Figure 1 As shown. Among them, rods 4, 5, and 7 form a stable triangle structure. The length between hinge 14 and sliding hinge 13 is l7, the length between fixed hinge 8 and fixed hinge 6 is l8, the length between fixed hinge 8 and sliding hinge 13 is l9, and the length between fixed hinge 8 and fixed hinge 10 is l 10 , the length between the fixed hinge point 10 and the hinge point 12 is l 11 , the length between fixed hinge point 2 and fixed hinge point 6 is l 12 , the length between the fixed hinge point 8 and the hinge point 12 is l 13 The length between the hinge point 14 and the sliding hinge point 17 is l 14 , the length between the sliding hinge 13 and the hinge 18 is l 15 , the length of the rod 11 is the sum of l9 and l7, and the hinge 12 and the hinge 18 are fixed on the rod 11 (including the hinge 12, the hinge 18, and the rod 11 are collinear).

[0040] Principle description:

[0041] The length of telescopic rod 1 is l1, the length of rod 5 is l3, and the length between fixed hinge 2 and fixed hinge 6 is l 12 The triangle 101 is formed, where l1 has a variable length and satisfies l1+l3>l 12 , l 12 +l3>l1, l1+l 12>l3; the length of rod 4 is l2, the length of rod 5 is l3, and the length of rod 7 is l4, forming a triangle 102 with a stable structure. The common side of triangle 101 and triangle 102 is rod 5 with a length of l3; the length of rod 7 is l4, the length between fixed hinge 8 and fixed hinge 6 is l8, and the length between fixed hinge 8 and sliding hinge 13 is l9, forming triangle 103, wherein the length of l9 is variable, satisfying l4+l8>l9, l8+l9>l4, l4+l9>l8, the common side of triangle 102 and triangle 103 is rod 7 with a length of l4; the length between fixed hinge 8 and hinge 12 is l 13 , the length between the fixed hinge point 10 and the hinge point 12 is l 11 , the length between fixed hinge point 8 and fixed hinge point 10 is l 10 The triangle 104 is formed, where l 11 and l 13 The length is variable, satisfying l 10 +l 11 > 13 , l 10 +l 13 > 11 , l 11 +l 13 > 10 , side l9 of triangle 103 and side l of triangle 104 13 Collinear; the length of connecting rod 16 is l5, the length of connecting rod 19 is l6, and the length between hinge 18 and sliding hinge 13 is l 15 The triangle 105 is formed, where l 15 The length is variable, satisfying l5+l 15 >l6、l5+l6>l 15 , l 15 +l6>l5; the length of the connecting rod 16 is l5, and the length between the hinge point 14 and the sliding hinge point 17 is l 14 The length between the hinge point 14 and the sliding hinge point 13 is l7, forming a triangle 106, wherein l7, l 14 The length is variable, satisfying l5+l 14 >l7、l5+l7>l 14 , l 14 +l7>l5, side l9 of triangle 103, side l of triangle 104 13 , side l7 of triangle 106 is collinear, and side l5 of triangle 105 is colinear with side l5 of triangle 106.

[0042] Therefore, when the length of l1 changes, triangle 101 drives triangle 102 to rotate and move, and triangle 102 drives triangle 103 to rotate and move, and triangles 103, 104, 105, and 106 work in conjunction to achieve the folding function of the entire mechanism.

[0043] Action Description: During the unfolding process of the whole mechanism, the telescopic rod 1 is retracted. l 1 changes in length, the change of triangle 101 drives triangle 102 to rotate and move; the structure of triangle 102 is stable, and the length of rod 7 is l 4 drives triangle 103 to rotate and move; through the collinear edges l 9 changes in length, i.e. rod 11, drives triangles 104, 105 and 106 to move in tandem, i.e. drives the side of triangle 104 l 11 and l 13 、The side of triangle 105 l 15 Change, the side of triangle 106 l 7. l 14 Changes to achieve the folding function of the entire mechanism (such as Figure 5 During the contraction of the entire mechanism, the movements of each component are opposite (e.g. Figure 6 ).

Claims

1. A novel multi-link folding mechanism, comprising three fixed supports which are not on the same straight line, the three fixed supports respectively having hinge points A, B and C, characterized in that: The telescopic rod is hinged at hinge point A, the triangular rod is hinged at hinge point B, the main folding rod is hinged at hinge point C, and the triangular rod is provided with hinge points B, D and E distributed in a triangle. The front end of the telescopic rod is hinged at hinge point B, hinge point E is a movable hinge 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 to the swing rod at hinge point F, and 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 and can move along the auxiliary folding rod, and the auxiliary folding rod is hinged at hinge point G at the front end of the main folding rod.

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

3. The novel multi-link folding mechanism according to claim 2 is characterized in that: When the telescopic rod is extended, the main folding rod flips downward, and the angle between the main folding rod and the auxiliary folding rod decreases; when the telescopic rod is shortened, the main folding rod flips upward, and the angle between the main folding rod and the auxiliary folding rod increases.

4. The novel multi-link folding mechanism according to claim 1 is characterized in that: The triangular rod is an integral plate-shaped structure, or is formed by hingedly connecting three rods.

5. The novel multi-link folding mechanism according to claim 1 is characterized in that: The 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 auxiliary folding rods serve as the sides of the second baffle.

6. The novel multi-link folding mechanism according to any one of claims 1 to 5, characterized in that: The lower folding rod is hinged at the lower hinge point M of the main folding rod.

7. The novel multi-link folding mechanism according to claim 6 is characterized in that: A fixed point N is arranged at the lower side of the hinge point C, and the lower folding rod always keeps in cooperation with the fixed point N during the movement.

8. The novel multi-link folding mechanism according to claim 6 is characterized in that: For the hinge point B, the hinge point C and the fixed point N, the angle between the line BC and the vertical plane is greater than the angle between the line CN and the vertical plane.

9. The novel multi-link folding mechanism according to claim 8 is characterized in that: The two sets of folding mechanisms are arranged in parallel, and a baffle is installed between the two lower folding rods.

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

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