Connecting rod driven folding hanging ladder mechanism

Abstract

The invention provides a connecting rod driven folding hanging ladder mechanism, which belongs to the field of hanging ladders and comprises a hanging ladder support, a hanging ladder upper section is rotatably mounted at the front end of the hanging ladder support through a seventh hinge point, the front end of the hanging ladder upper section is movably connected with the tail end of a piston rod of a hydraulic cylinder through a third hinge point, and a cylinder barrel part of the hydraulic cylinder is provided with a fifth hinge point. The fifth hinge point is movably connected with a sixth hinge point arranged at the front end of the hanging ladder support through a first connecting rod, the front end of the upper hanging ladder section is rotatably provided with the lower hanging ladder section through a second hinge point, and folding and unfolding of the whole hanging ladder mechanism can be controlled through contraction and extension of the hydraulic cylinder. The hanging ladder can be used as a guardrail after being folded upwards, folding can be completed only by controlling one hydraulic cylinder, operation is convenient, cost is saved, folding and unfolding are flexible, space is saved, and stability is good.

Description

Technical Field

[0001] The invention belongs to the field of suspension ladders, and in particular relates to a connecting rod driven folding suspension ladder mechanism. Background Art

[0002] At present, in order to facilitate the work of operators, most large agricultural machinery and engineering machinery need hanging ladders. There are two types of hanging ladders for large agricultural machinery and engineering machinery. One is a fixed hanging ladder, which is directly fixed to the driving platform by bolts and extends vertically downward. The other is a rotating hanging ladder, which is connected to the vehicle body through an axis fixed on the driving platform and can rotate left and right. The fixed hanging ladder occupies a large space. When repairing the equipment, the hanging ladder needs to be disassembled, which is cumbersome. The rotating hanging ladder has a rotating axis on the large machine body, is not stable enough, and is prone to danger.

[0003] The utility model patent with patent number CN209354045U discloses a foldable suspension ladder, including a fixed frame, a platform and a ladder frame. The fixed frame is used to be installed on both sides of the bottom of the skylight or on the wall below. One end of the platform is hingedly connected to the fixed frame, and the other end is hingedly connected to the top of the ladder frame. There are soft connections between the platform and the fixed frame, and between the platform and the ladder frame. However, the foldable suspension ladder requires more manpower and time to fold, and it also takes up more space. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a connecting rod driven folding suspension ladder mechanism.

[0005] The present invention discloses a connecting rod driven folding suspension ladder mechanism, comprising a suspension ladder support, a suspension ladder upper section is rotatably mounted at the front end of the suspension ladder support through a hinge point seven, the front end of the suspension ladder upper section is movably connected to the piston rod end of a hydraulic cylinder through a hinge point three, a cylinder barrel of the hydraulic cylinder is provided with a hinge point five, the hinge point five is movably connected to a hinge point six provided at the front end of the suspension ladder support through a connecting rod one, a suspension ladder lower section is rotatably mounted at the front end of the suspension ladder upper section through a hinge point two, and the folding and unfolding of the entire suspension ladder mechanism can be controlled by the contraction and extension of the hydraulic cylinder; Furthermore, a connecting rod 4 is rotatably mounted at the lower front end of the upper section of the suspension ladder via a hinge point 4; Further, a connecting rod 5 is rotatably mounted on the upper part of the lower section of the suspension ladder through a hinge point; Further, the rear end of the upper section of the suspension ladder is rotatably mounted with a connecting rod 2 through a hinge point 8, and one end of the connecting rod 2 is movably connected to the hinge point 5; Further, the other end of the connecting rod 2 is provided with a hinge point 9, and the connecting rod 2 is rotatably mounted with the connecting rod 3 through the hinge point 9; Further, one end of the connecting rod three, the connecting rod four, and the connecting rod five are movably connected to the hinge point ten; Further, the suspension ladder support is fixedly installed on the large machinery; Furthermore, a limit block is fixedly installed at the front end of the suspension ladder support, and when the suspension ladder mechanism is fully unfolded, the limit block can limit the connecting rod 1.

[0006] The present invention can bring the following beneficial effects: 1. The present invention only needs to operate one hydraulic cylinder to complete the simultaneous folding of the upper section and the lower section of the suspension ladder, which is easy to operate and saves costs; 2. After the suspension ladder mechanism of the present invention is unfolded, the limit block limits the connecting rod 1, and the relative positions of the piston rod and the cylinder barrel of the hydraulic cylinder are fixed, forming a stable support with good safety; 3. The upper section and the lower section of the suspension ladder of the present invention can both rotate. Compared with the suspension ladder with only one section that can rotate, the present invention is more flexible in folding and unfolding and saves more space; 4. After being completely folded, the suspension ladder of the present invention is vertically upward and can be used as a guardrail beside a large machine operating table. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 Shown is an axonometric view of the fully extended state of the present invention Figure 2 The state axonometric diagram of the present invention during folding is shown Figure 3 The axonometric view of the fully folded state of the present invention is shown. Figure 4 Shown is a side view of the present invention during folding Figure 5 The geometric principle of the folding process of the present invention is shown Figure 1 Figure 6 The geometric principle of the folding process of the present invention is shown Figure 2 In the figure: 1-lower section of suspension ladder, 2-upper section of suspension ladder, 3-support of suspension ladder, 4-limiting block, 5-hydraulic cylinder, 601-connecting rod one, 602-connecting rod two, 603-connecting rod three, 604-connecting rod four, 605-connecting rod five, 701-hinge point one, 702-hinge point two, 703-hinge point three, 704-hinge point four, 705-hinge point five, 706-hinge point six, 707-hinge point seven, 708-hinge point eight, 709-hinge point nine, 710-hinge point ten. DETAILED DESCRIPTION

[0008] The following will be combined with the drawings in the embodiments of the patent of the present invention to clearly and completely describe the technical solutions in the embodiments of the patent of the present invention. Obviously, the described embodiments are only part of the embodiments of the patent of the present invention, not all of them. Based on the embodiments in the patent of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the patent of the present invention.

[0009] like Figure 1-Figure 3 As shown, a connecting rod driven folding suspension ladder mechanism of the present invention comprises a suspension ladder lower section 1, a suspension ladder upper section 2, a suspension ladder support 3, and a hydraulic cylinder 5.

[0010] The suspension ladder support 3 is fixedly installed on a large agricultural machine or an engineering machine, and a limit block 4 is fixedly installed at the front end of the suspension ladder support 3 .

[0011] The rear end of the upper section 2 of the suspension ladder is rotatably mounted on the front end of the suspension ladder support 3 via the hinge point seven 707, the front end of the upper section 2 of the suspension ladder is movably connected to the end of the piston rod of the hydraulic cylinder 5 via the hinge point three 703, the cylinder barrel of the hydraulic cylinder 5 is movably connected to the connecting rod one 601 via the hinge point five 705, the connecting rod one 601 is rotatably mounted on the suspension ladder support 3 via the hinge point six 706, and the lower part of the front end of the upper section 2 of the suspension ladder is rotatably mounted with the connecting rod four 604 via the hinge point four 704.

[0012] The lower section 1 of the suspension ladder is rotatably mounted on the lower front end of the upper section 2 of the suspension ladder via a hinge point 2 702 , and a connecting rod 5 605 is rotatably mounted on the upper part of the lower section 1 of the suspension ladder via a hinge point 701 .

[0013] The rear end of the upper section 2 of the suspension ladder is rotatably mounted with a connecting rod 2 602 through a hinge point 8 708, one end of the connecting rod 2 602 is movably connected to a hinge point 5 705, and the other end is rotatably mounted with a connecting rod 3 603 through a hinge point 9 709. One end of the connecting rod 3 603, the connecting rod 4 604, and the connecting rod 5 605 are movably connected to the hinge point 10 710.

[0014] like Figure 4 As shown, the present invention is a connecting rod driven folding suspension ladder mechanism. If it is folded from the unfolded state, the hydraulic control system is started to shrink the hydraulic cylinder 5. The shrinkage of the hydraulic cylinder 5 causes the hinge point 3 703 to move toward the hinge point 5 705, and the hinge point 4 704 also moves toward the hinge point 5 705.

[0015] The hinge point 4 704 (because the hinge point 3 703 and the hinge point 4 704 are close to each other and their relative positions are fixed, they can be approximately regarded as one point), the hinge point 5 705, the hinge point 6 706, and the hinge point 7 707 are connected to form a quadrilateral, such as Figure 5As shown, it is represented by quadrilateral ABDE, point A represents hinge point 704, point B represents hinge point 705, point D represents hinge point six 706, point E represents hinge point seven 707, point C is on line segment AE, representing hinge point 708, line segment AB represents hydraulic cylinder, line segment BD represents connecting rod one 601, line segment DE represents the distance between hinge point six 706 and hinge point seven 707 (fixed and constant length), line segment BC represents the upper half of connecting rod two 602, line segment AE represents the bottom edge of upper section 2 of suspension ladder, the movement of line segment AE can represent the movement of upper section 2 of suspension ladder, and the black part in the figure indicates that the point or line segment is fixed.

[0016] In triangle ABC, when point A moves toward point B, line segment AB shortens (hydraulic cylinder 5 contracts). Since the lengths of line segments BC and AC remain unchanged, ∠ABC becomes larger and ∠ACB becomes smaller. In quadrilateral BDEC, since ∠BCE is the supplementary angle of ∠ACB, ∠BCE becomes larger. Since the lengths of the four sides of quadrilateral BDEC are fixed, ∠BDE becomes larger, ∠CBD and ∠CED become smaller. Since angle CED becomes smaller and line segment DE is fixed, line segment AE rotates clockwise, that is, upper section 2 of the suspended ladder rotates clockwise around hinge point 7707 (point E).

[0017] Hinge point two 702, hinge point four 704, hinge point five 705, hinge point nine 709, hinge point ten 710, and hinge point one 701 are connected in sequence, as shown in Figure 6, and represented by polygon JABFGH. Point J, point A and point C are all on the lower edge of the upper section 2 of the suspension ladder. The relative positions of these three points are fixed and they move synchronously. Line segment BF represents connecting rod two 602, line segment GF represents connecting rod three 603, line segment HG represents connecting rod five 605, and line segment JH represents the lower section 1 of the suspension ladder.

[0018] As mentioned above, when the hydraulic cylinder 5 contracts, the line segment AB becomes shorter, ∠ACB becomes smaller, and in the parallelogram ACFG, the corresponding angle ∠GFC of ∠ACB becomes smaller, and the diagonal angle ∠GAC of ∠GFC also becomes smaller. In the quadrilateral JAGH, the adjacent angle ∠JAG of ∠GAC becomes larger, and the diagonal angle ∠JHG of ∠JAG also becomes larger, and the line segment JH rotates counterclockwise, that is, the lower section 1 of the suspension ladder rotates counterclockwise around the hinge point 701 (point H).

[0019] Since the upper section 2 of the suspension ladder rotates clockwise (while JAC rotates clockwise), the lower section 1 of the suspension ladder, which is movably connected to the upper section 2 of the suspension ladder through the hinge point 702 (point J), also revolves clockwise around the hinge point 702 (point J).

[0020] When the lower section 1 of the suspension ladder and the upper section 2 of the suspension ladder rotate to the position shown in FIG3 , the upper section 2 of the suspension ladder limits the lower section 1 of the suspension ladder, and the folding steps of the entire suspension ladder mechanism are completed.

[0021] When the ladder is fully folded, it is in an upright position and can also be used as a guardrail next to a large machinery operating table.

[0022] If the entire suspension ladder mechanism is to be unfolded from folding, the opposite operation is performed to extend the hydraulic cylinder 5: the aforementioned hinge points and connecting rods move in opposite directions; the upper section 2 of the suspension ladder rotates counterclockwise around the hinge point 707; the lower section 1 of the suspension ladder revolves counterclockwise around the hinge point 2 702 and rotates clockwise around the hinge point 1 701.

[0023] When the lower section 1 of the suspension ladder and the upper section 2 of the suspension ladder rotate to the position shown in FIG1 , the limit block 4 limits the connecting rod 601, the relative positions of the piston rod and the cylinder barrel of the hydraulic cylinder 5 are fixed, and the deployment steps of the entire suspension ladder mechanism are completed.

[0024] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A connecting rod driven folding suspension ladder mechanism, comprising a suspension ladder support (3), the front end of the suspension ladder support (3) being rotatably mounted with a suspension ladder upper section (2) via a hinge point seven (707), the front end of the suspension ladder upper section (2) being movably connected to the piston rod end of a hydraulic cylinder (5) via a hinge point three (703), the cylinder barrel portion of the hydraulic cylinder (5) being provided with a hinge point five (705), the hinge point five (705) being movably connected to a hinge point six (706) provided at the front end of the suspension ladder support (3) via a connecting rod one (601), the front end of the suspension ladder upper section (2) being rotatably mounted with a suspension ladder lower section (1) via a hinge point two (702), characterized in that: The folding and unfolding of the entire suspension ladder mechanism can be controlled by the contraction and extension of the hydraulic cylinder (5).

2. A connecting rod driven folding suspension ladder mechanism according to claim 1, characterized in that: A connecting rod four (604) is rotatably mounted on the lower front end of the upper section (2) of the suspension ladder via a hinge point four (704).

3. A connecting rod driven folding suspension ladder mechanism according to claim 2, characterized in that: A connecting rod 5 (605) is rotatably mounted on the upper portion of the lower section (1) of the suspension ladder via a hinge point (701).

4. A connecting rod driven folding suspension ladder mechanism according to claim 3, characterized in that: The rear end of the upper section (2) of the suspension ladder is rotatably mounted with a second connecting rod (602) via an eighth hinge point (708), and one end of the second connecting rod (602) is movably connected to a fifth hinge point (705).

5. The connecting rod driven folding suspension ladder mechanism according to claim 4, characterized in that: The other end of the second connecting rod (602) is provided with a hinge point nine (709), and the second connecting rod (602) is rotatably mounted with the third connecting rod (603) via the hinge point nine (709).

6. A connecting rod driven folding suspension ladder mechanism according to claim 5, characterized in that: One end of the connecting rod three (603), the connecting rod four (604) and the connecting rod five (605) are movably connected to the hinge point ten (710).

7. The connecting rod driven folding suspension ladder mechanism according to claim 6, characterized in that: The suspension ladder support (3) is fixedly installed on the large machinery.

8. The connecting rod driven folding suspension ladder mechanism according to claim 7, characterized in that: A limit block (4) is fixedly mounted on the front end of the suspension ladder support (3); when the suspension ladder mechanism is fully extended, the limit block (4) can limit the position of the connecting rod 1 (601).

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