Hydraulically-driven folding hanging ladder

Abstract

The invention provides a hydraulic drive folding hanging ladder, which belongs to the field of hanging ladders, and comprises a ladder support, the front end of the ladder support is provided with a second hinge point A and a second hinge point B. A ladder upper section is movably connected with the ladder support through the second hinge point A and the second hinge point B. A fourth hinge point A and a fourth hinge point B are arranged below the ladder upper section. The lower ladder section is movably connected with the upper ladder section through a fourth hinge point A and a fourth hinge point B. The foldable hanging ladder is characterized in that a first hinge point is arranged below the ladder support, a third hinge point is arranged on the upper portion of the upper ladder section, a hydraulic cylinder is movably installed between the first hinge point and the third hinge point, and folding and unfolding of the hanging ladder can be achieved by controlling the hydraulic cylinder to contract and extend. The device is convenient to operate, saves maintenance cost, is flexible to fold and unfold, and saves space.

Description

Technical Field

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

[0002] At present, in order to facilitate the operation of operators, large agricultural machinery and construction machinery are generally equipped with climbing ladders. Common ladder structures are mainly divided into two categories: one is a fixed climbing ladder, which is installed on the driving platform by bolt fastening and extends vertically to the ground; the other is a rotating movable ladder, which is connected to the driving platform through a rotating shaft and can be rotated and stored horizontally. Fixed ladders take up a large space due to their vertical layout, and the ladder body needs to be disassembled during equipment maintenance, which increases the complexity of operation. Although the rotating ladder has the characteristic of being foldable, since the rotating shaft is usually located on the side of the vehicle body, there is a hidden danger of insufficient support stability after the ladder body is unfolded, which is easy to cause safety risks.

[0003] The utility model patent with patent number CN222478611U provides a compact foldable telescopic escalator, which includes a main ladder and an auxiliary ladder. The auxiliary ladder can be retracted inside the main ladder, and the two can be fixed by a pin. However, the telescopic escalator requires manual installation and removal of the pin when retracting, which is inconvenient to operate. In addition, the patent is applied in the field of mining machinery technology, and manual operation is inconvenient and poses a safety hazard. Summary of the invention

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

[0005] A hydraulically driven folding suspension ladder comprises a ladder support, a hinge point 2A and a hinge point 2B are provided at the front end of the ladder support, an upper ladder section is movably connected to the ladder support through the hinge point 2A and the hinge point 2B, a hinge point 4A and a hinge point 4B are provided below the upper ladder section, and a lower ladder section is movably connected to the upper ladder section through the hinge point 4A and the hinge point 4B, and is characterized in that a hinge point 1 is provided below the ladder support, a hinge point 3 is provided at the upper part of the upper ladder section, a hydraulic cylinder is movably installed between the hinge point 1 and the hinge point 3, and the suspension ladder can be folded and unfolded by controlling the contraction and extension of the hydraulic cylinder; Furthermore, a hinge point 5 is provided at the upper part of the upper section of the ladder, and a connecting rod 1 is movably installed on the hinge point 5; Further, one end of the connecting rod is provided with a hinge point six, the connecting rod two is movably mounted on the hinge point six, and the other end of the connecting rod one is movably mounted with a pulley through a pin shaft; Furthermore, a pulley track is provided on the inner side of the ladder support, and the pulley can roll in the pulley track; Further, a hinge point seven is provided at the lower part of the upper section of the ladder, and a connecting rod three is movably installed on the hinge point seven; a hinge point nine is provided at the upper part of the lower section of the ladder, and a connecting rod four is movably installed on the hinge point nine; Further, one end of the connecting rod 2, the connecting rod 3 and the connecting rod 4 are movably connected through the hinge point 8; Further, the ladder support is fixedly mounted on the large machinery.

[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 rotation of the upper section and the lower section of the suspension ladder, which is easy to operate and saves maintenance costs; 2. The upper section and the lower section of the suspension ladder of the present invention can both rotate. Compared with a suspension ladder in which only one section can rotate, the present invention is more flexible in folding and unfolding and saves more space. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The figure shows the axonometric view of the present invention in the unfolded state as viewed from direction A. Figure 2 The figure shows the axonometric view of the present invention in the unfolded state as viewed from direction B. Figure 3 The folding process of the present invention is shown in the axonometric view from the direction A. Figure 4 The folding process of the present invention is shown in the axonometric view from the B direction. Figure 5 Shown Figure 4 A partial enlarged cross-sectional view of the circled part Figure 6 Shown is a side view of the folding process of the present invention Figure 1 Figure 7 Shown is a side view of the folding process of the present invention Figure 2 Figure 8 The axonometric view of the fully folded state of the present invention is shown. Fig. 9 The geometric principle of the folding process of the present invention is shown Figure 1 Fig.10 The geometric principle of the folding process of the present invention is shown Figure 2 In the figure: 1-ladder bracket, 101-pulley track, 102-pulley, 2-hydraulic cylinder, 3-ladder upper section, 4-ladder lower section, 501-hinge point one, 502-hinge point two A, 502'-hinge point two B, 503-hinge point three, 504-hinge point four A, 504-hinge point four B, 505-hinge point five, 506-hinge point six, 507-hinge point seven, 508-hinge point eight, 509-hinge point nine, 601-connecting rod one, 602-connecting rod two, 603-connecting rod three, 604-connecting rod four 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 4 As shown, the present invention is a hydraulically driven folding suspended ladder, comprising a ladder bracket 1, a hydraulic cylinder 2, a ladder upper section 3, and a ladder lower section 4. The ladder bracket 1 is fixedly installed on a large machine, a hinge point A502 and a hinge point B502' are provided at the front end of the ladder bracket 1, the ladder upper section 3 is movably connected to the ladder bracket 1 through the hinge point A502 and the hinge point B502', a hinge point A504 and a hinge point B504' are provided below the ladder upper section 3, and the ladder lower section 4 is movably connected to the ladder upper section 3 through the hinge point A504 and the hinge point B504'.

[0010] A hinge point 1 501 is provided below the ladder bracket 1 , a hinge point 3 503 is provided on the upper part of the ladder upper section 3 , the cylinder barrel part of the hydraulic cylinder 2 is movably connected to the hinge point 1 501 , and the hydraulic rod part of the hydraulic cylinder 2 is movably connected to the hinge point 3 503 .

[0011] A hinge point 505 is provided on the other side of the upper part of the ladder upper section 3, and a connecting rod 601 is movably installed on the hinge point 505. Figure 3 and Figure 5 As shown, one end of the connecting rod 1 601 is provided with a hinge point 6 506, and the connecting rod 2 602 is movably installed on the hinge point 6 506. The other end of the connecting rod 1 601 is movably installed with a pulley 102 through a pin shaft. The inner side of the ladder bracket 1 is provided with a pulley track 101, and the pulley 102 can roll in the pulley track 101.

[0012] A hinge point seven 507 is provided at the lower part of the upper section 3 of the ladder, and a connecting rod three 603 is movably installed on the hinge point seven 507. A hinge point nine 509 is provided at the upper part of the lower section 4 of the ladder, and a connecting rod four 604 is movably installed on the hinge point nine 509. One ends of the connecting rod two 602, the connecting rod three 603, and the connecting rod four 604 are movably connected via a hinge point eight 508.

[0013] The present invention provides a hydraulically driven folding suspension ladder. To fold the ladder from an extended state, the hydraulic control system is activated to cause the hydraulic cylinder 2 to retract. Figure 6 As shown, when the hydraulic cylinder 2 contracts, the hinge point three 503 moves toward the hinge point one 501.

[0014] like Fig. 9As shown, hinge point two A502, hinge point one 501, and hinge point three 503 are regarded as the three vertices of triangle CDF, and hinge point four A504 is added. Point C represents hinge point two 502, point D represents hinge point one 501, point F represents hinge point three 503, and point E represents hinge point four A504. Connect point E and point F, then line segment CD represents ladder support 1, whose length and position remain unchanged. Line segment DF represents hydraulic cylinder 2. Since points C, F, and E are all fixed on the upper section 3 of the suspended ladder, broken line CFE represents the upper section 3 of the suspended ladder. The black parts in the figure represent points or line segments that are fixed.

[0015] When the hydraulic cylinder 2 contracts, the line segment DF becomes shorter. Since the length and position of the line segment CD (ladder support 1) remain unchanged, point F moves toward point D at this time, and the broken line CFE (upper section 3 of the suspension ladder) rotates upward around point C (hinge point 2 A502). Since the lower section 4 of the suspension ladder is movably connected to the upper section 3 of the suspension ladder through the hinge point 4 504A (point E), the lower section 4 of the suspension ladder is driven by the upper section 3 of the suspension ladder and revolves around point C (hinge point 2 502A).

[0016] exist Figure 7 In the figure, the hinge point 2 B502', the hinge point 4 B504', the hinge point 505, the hinge point 6 506, the hinge point 7 507, the hinge point 8 508, the hinge point 9 509, and the pulley 102 are regarded as the vertices of the polygon, and connected to form the following: Fig.10 The figure shown. Point C' represents hinge point 2 B502', point G represents hinge point 6 506, point H represents hinge point 8 508, point J represents hinge point 9 509, point E' represents hinge point 4 B504', point K represents hinge point 7 507, point L represents hinge point 5 505, and point M represents pulley 102; since C', L, K, and E' are all fixed on the upper section 3 of the suspension ladder, the broken line C'LKE' or a part thereof represents the upper section 3 of the suspension ladder, the line segment MG represents the connecting rod 1 601, the line segment GH represents the connecting rod 2 602, the line segment KH represents the connecting rod 3 603, and the line segment HJ represents the connecting rod 4 604. Since E' and J are all fixed on the lower section 4 of the suspension ladder, the line segment E'J can represent the lower section 4 of the suspension ladder.

[0017] From the above, it can be seen that the upper section 3 of the suspension ladder rotates upward around the point C' (C and C' are coaxial), and C' is fixed, so the point M is pushed to the far end (the pulley 102 rolls in the pulley track 101), ∠C'LM becomes larger, ∠MLK becomes smaller, ∠GLK becomes larger, and in the quadrilateral LGHK (four-bar linkage), the inner angle ∠LKH on the same side of ∠GLK becomes smaller. Since ∠LKE' remains unchanged (the three points are all fixed on the upper section 3 of the suspension ladder), in the quadrilateral KHJE', ∠E'KH becomes larger, ∠E'JH becomes larger, and the line segment E'J rotates upward around the point E', that is, the lower section 4 of the suspension ladder rotates upward around the hinge point four B504'.

[0018] Continuously contract the hydraulic cylinder 2 to complete the folding action of the ladder. The state of the folded ladder is as follows: Figure 8 If the ladder is to be unfolded, the hydraulic cylinder 2 is operated to extend, and the reverse action of the above action is repeated.

[0019] 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 to 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 hydraulically driven folding suspended ladder, comprising a ladder support (1), wherein the front end of the ladder support (1) is provided with a hinge point II A (502) and a hinge point II B (502'), an upper ladder section (3) is movably connected to the ladder support (1) via the hinge point II A (502) and the hinge point II B (502'), a hinge point IV A (504) and a hinge point IV B (504') are provided below the upper ladder section (3), and a lower ladder section (4) is movably connected to the upper ladder section (3) via the hinge point IV A (504) and the hinge point IV B (504'), wherein the lower ladder section (4) is movably connected to the upper ladder section (3) via the hinge point IV A (504) and the hinge point IV B (504'), characterized in that: A hinge point 1 (501) is provided below the ladder support (1), a hinge point 3 (503) is provided on the upper part of the ladder upper section (3), and a hydraulic cylinder (2) is movably installed between the hinge point 1 (501) and the hinge point 3 (503). By controlling the contraction and extension of the hydraulic cylinder (2), the suspension ladder can be folded and unfolded.

2. A hydraulically driven folding suspension ladder according to claim 1, characterized in that: A hinge point five (505) is provided at the upper part of the ladder upper section (3), and a connecting rod one (601) is movably mounted on the hinge point five (505).

3. A hydraulically driven folding suspension ladder according to claim 2, characterized in that: One end of the connecting rod 1 (601) is provided with a hinge point 6 (506), and the connecting rod 2 (602) is movably mounted on the hinge point 6 (506). The other end of the connecting rod 1 (601) is movably mounted with a pulley (102) via a pin shaft.

4. The hydraulically driven folding suspension ladder according to claim 3, characterized in that: A pulley track (101) is provided inside the ladder support (1), and a pulley (102) can roll inside the pulley track (101).

5. The hydraulically driven folding suspension ladder according to claim 4, characterized in that: A hinge point seven (507) is provided at the lower part of the ladder upper section (3), and a connecting rod three (603) is movably installed on the hinge point seven (507). A hinge point nine (509) is provided at the upper part of the ladder lower section (4), and a connecting rod four (604) is movably installed on the hinge point nine (509).

6. The hydraulically driven folding suspension ladder according to claim 5, characterized in that: One end of the second connecting rod (602), the third connecting rod (603) and the fourth connecting rod (604) are movably connected via the eighth hinge point (508).

7. The hydraulically driven folding suspension ladder according to claim 1, characterized in that: The ladder bracket (1) is fixedly installed on the large machinery.

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