Folding ladder for vehicle-mounted engineering machinery

Abstract

The utility model discloses a folding ladder for vehicle-mounted engineering machinery. The folding ladder comprises a first-stage ladder, a second-stage ladder, a third-stage ladder, a fourth-stage ladder, a rotary hinged support, a connecting rod, a rubber roller, a telescopic sliding rail, a storage box, a mounting seat, a limiting plate and a spring limiting pin, the first-stage ladder is rotationally connected with the second-stage ladder, the second-stage ladder is rotationally connected with the third-stage ladder, the third-stage ladder is rotationally connected with the fourth-stage ladder in a sliding manner, the fourth-stage ladder is connected with the storage box in a sliding manner, and sliding storage is integrally carried out by adopting a two-stage telescopic manner of overlapping and telescopic. According to the folding ladder disclosed by the utility model, the space utilization rate of the existing folding ladder is improved by a rotary overlapping and sliding storage mode between the ladders, the storage space in the height direction and the length direction is saved, the ladder with a longer stroke can be mounted in the mounting space with the same volume, and meanwhile, the lap joint area is larger under the same telescopic length, so that the folding ladder is more convenient to mount. And the structural stability of the ladder is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of folding ladders, and particularly relates to a folding ladder for on-vehicle engineering machinery. Background Art

[0002] A ladder is a commonly used tool for climbing heights. It usually has two spaced vertical rods as support components, and multiple horizontal rods for climbing arranged between the vertical rods as load-bearing components. When in use, one end is placed on the ground, and the other end is placed on the edge of the item to be climbed. The whole is at an inclined angle to facilitate the up and down climbing of personnel.

[0003] On-vehicle engineering machinery is generally large in volume, has a high chassis, and the operation end is often arranged on the chassis frame. In order to facilitate technicians to get on and off the vehicle, they often need to use a ladder.

[0004] For existing on-vehicle engineering machinery, most of the equipped ladders are in the form of straight ladders, which cannot be folded in structure and occupy a large space in the storage state; for some foldable telescopic ladders, in order to ensure the telescopic storage length, the overlapping area is often reduced, resulting in poor structural stability of the ladder in the unfolded state and overall shaking during use. Content of the Utility Model

[0005] The problem to be solved by the utility model is to provide a folding ladder for on-vehicle engineering machinery, which is used to solve the problems that the straight ladder used in existing on-vehicle engineering machinery cannot be folded and occupies a large space, and the folding ladder has poor overlapping firmness and poor structural stability.

[0006] The utility model adopts the following technical scheme: a folding ladder for on-vehicle engineering machinery, comprising: a first-stage ladder, a second-stage ladder, a third-stage ladder, a fourth-stage ladder, a rotary hinge seat, a connecting rod, a rubber roller, a telescopic slide rail, a storage box, a mounting seat, a limiting plate, and a spring limiting pin.

[0007] The first-stage ladder is rotatably connected to the second-stage ladder by bolts, and the second-stage ladder is rotatably connected to the third-stage ladder by a rotary hinge seat; the third-stage ladder is rotatably connected to the fourth-stage ladder by a connecting rod, and the third-stage ladder and the connecting rod are slidably connected along the chute of the fourth-stage ladder. The third-stage ladder is received into the fourth-stage ladder under the support of the rubber roller; the fourth-stage ladder is slidably connected to the storage box through a telescopic slide rail.

[0008] The length of the first-stage ladder is less than that of the second-stage ladder, and the length of the second-stage ladder is greater than that of the third-stage ladder.

[0009] Preferably, the folding ladder includes at least an unfolded state and a folded state. In the unfolded state, the first ladder, the second ladder, and the third ladder are in a straight-line unfolded form and form a stable supporting angle with the fourth ladder; in the folded state, the first ladder, the second ladder, and the third ladder are superposed and stored inside the storage box through the fourth ladder. The spring limit pin is arranged on the first ladder for limiting and fixing the whole folding ladder.

[0010] In the unfolded state, the first ladder can be rotated by bolts to be parallel to the second ladder and is limited by the round steel below the second ladder; the second ladder can be rotated to be parallel to the third ladder and is limited by the cushion block inside the rotary hinge seat.

[0011] In the folded state, the lower surface of the first ladder can be rotated to a position parallel and superposed with the upper surface of the second ladder, limited by the upper limit block on the second ladder, and fixed by inserting the spring limit pin into the side hole of the second ladder; the upper surface of the second ladder can be rotated to a position parallel and superposed with the third ladder and is limited by the upper limit block on the third ladder. The first ladder is located inside the second ladder and the third ladder.

[0012] Preferably, the inside of the connection between the third ladder and the fourth ladder is in a hollow state and is provided with a chute.

[0013] In the unfolded state, the third ladder slides along the chute of the fourth ladder to the outer limit position, and then rotates to the limit plate through the connecting rod. The limit plate is used to limit the rotation angle of the third ladder; the fourth ladder slides along the telescopic slide rail to the outermost limit position and is fixed by inserting the spring limit pin into the notch of the lower plate of the storage box.

[0014] In the folded state, the third ladder rotates to a position parallel to the fourth ladder through the connecting rod, and then slides along the chute of the fourth ladder to the inner limit position, contracting the third ladder into the fourth ladder; the fourth ladder slides along the telescopic slide rail to the innermost limit position and is completely located inside the storage box.

[0015] The first ladder and the second ladder do not enter the inner space of the fourth ladder in the folded state, but are arranged above the fourth ladder.

[0016] Preferably, the storage box and the mounting seat are fixed by bolts. The mounting seat is used to connect and mount the folding ladder on the vehicle-mounted construction machinery.

[0017] Compared with the prior art by adopting the above technical solutions, the utility model has the following technical effects:

[0018] 1. For the folding ladder for vehicle-mounted construction machinery of the utility model, the first ladder and the second ladder are rotationally connected, the second ladder and the third ladder are rotationally connected, and the third ladder and the fourth ladder are rotationally connected + slidably connected. The whole is stored in a superposed + telescopic manner, overcoming the problem that the traditional straight ladder cannot be folded.

[0019] 2. The folding ladder for on-vehicle construction machinery of the present utility model has the third-level ladder and the fourth-level ladder connected by rotational connection + sliding connection, and the fourth-level ladder and the storage box are connected by sliding connection. The overall sliding storage is carried out in a two-stage telescopic manner. Under the same telescopic length, compared with the first-stage telescopic mechanism, the overlapping area is larger, which can improve the structural stability of the ladder.

[0020] 3. The folding ladder for on-vehicle construction machinery of the present utility model adopts the method of rotational superposition + sliding storage between each level of the ladder, which further improves the space utilization rate of the existing folding ladder, saves the storage space in the height direction and the length direction, and ensures that a ladder with a longer stroke can be installed within the installation space of the same volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the structural diagram of the folding ladder for on-vehicle construction machinery of the present utility model;

[0022] Figure 2 It is the structural diagram of the folding ladder for on-vehicle construction machinery of the present utility model under the first folding step;

[0023] Figure 3 It is the structural diagram of the folding ladder for on-vehicle construction machinery of the present utility model under the second folding step;

[0024] Figure 4 It is the structural diagram of the folding ladder for on-vehicle construction machinery of the present utility model under the first telescopic step;

[0025] Figure 5 It is the structural diagram of the folding ladder for on-vehicle construction machinery of the present utility model under the second telescopic step;

[0026] Figure 6 It is the structural diagram of the first-level ladder of the folding ladder for on-vehicle construction machinery of the present utility model;

[0027] Figure 7 It is the structural diagram of the second-level ladder of the folding ladder for on-vehicle construction machinery of the present utility model;

[0028] Figure 8 It is the structural diagram of the third-level ladder of the folding ladder for on-vehicle construction machinery of the present utility model;

[0029] Figure 9 It is the structural diagram of the fourth-level ladder of the folding ladder for on-vehicle construction machinery of the present utility model;

[0030] Figure 10 It is the structural diagram of the rotary hinge seat of the folding ladder for on-vehicle construction machinery of the present utility model;

[0031] Explanation of symbols in the figure:

[0032] 1. First - stage ladder; 101. First through - hole; 102. First pin seat; 2. Second - stage ladder; 201. Second through - hole; 202. First pin hole; 203. First limit block; 204. Second connection hole; 205. First limit tube; 3. Third - stage ladder; 301. Fixed handle; 302. Third connection hole; 303. Second limit block; 304. Third through - hole; 4. Fourth - stage ladder; 401. Fourth ladder frame; 402. Slide groove; 403. Roller hole; 404. Limit plate hole; 405. Slide rail connection hole; 406. Spring pin hole; 5. Rotary hinge seat; 501. Hinge seat frame; 502. Hinge seat head; 503. Nylon cushion block; 6. Connecting rod; 7. Rubber roller; 8. Telescopic slide rail; 9. Storage box; 10. Mounting seat; 11. Limit plate; 12. Spring limit pin. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present invention.

[0034] In an embodiment of the present invention, a folding ladder for vehicle - mounted construction machinery is as Figure 1 shown, including: first - stage ladder 1, second - stage ladder 2, third - stage ladder 3, fourth - stage ladder 4, rotary hinge seat 5, connecting rod 6, rubber roller 7, telescopic slide rail 8, storage box 9, mounting seat 10, limit plate 11 and spring limit pin 12.

[0035] Specifically, the first - stage ladder 1 and the second - stage ladder 2 are rotatably connected, and the first - stage ladder 1 can rotate to a position where it overlaps with the second - stage ladder 2; the second - stage ladder 2 and the third - stage ladder 3 are rotatably connected through the rotary hinge seat 5, and the second - stage ladder 2 can rotate to a position where it overlaps with the third - stage ladder 3; the third - stage ladder 3 and the fourth - stage ladder 4 are rotatably connected through the connecting rod 6, and the third - stage ladder 3 can rotate to the position where it coincides with the limit plate 11; the third - stage ladder 3 and the fourth - stage ladder 4 are slidably connected along the slide groove through the connecting rod 6, and the third - stage ladder 3 can be received into the fourth - stage ladder 4 under the support of the rubber roller 7.

[0036] Among them, the fourth - stage ladder 4 and the storage box 9 are slidably connected through the telescopic slide rail 8, and the fourth - stage ladder 4 can be received into the storage box 9; the storage box 9 and the mounting seat 10 are fixed by bolts.

[0037] The length of the first - stage ladder 1 is less than that of the second - stage ladder 2, the length of the second - stage ladder 2 is greater than that of the third - stage ladder 3, and the spring limit pin 12 is used for overall limit fixation.

[0038] The folding ladder provided in this embodiment has at least two states: an unfolded state and a folded state.

[0039] In the unfolded state, the first - stage ladder 1, the second - stage ladder 2, and the third - stage ladder 3 are in a straight line or other set unfolded configurations, and form a certain set angle with the fourth - stage ladder 4; in the folded state, the overall structure composed of the first - stage ladder 1, the second - stage ladder 2, the third - stage ladder 3, and the fourth - stage ladder 4 has the smallest storage volume, so that the whole can be stored in a preset storage box 9.

[0040] The structure of the folding ladder for on - vehicle construction machinery in this embodiment from a certain perspective in the first folding step is as Figure 2 shown.

[0041] In the first folding step, rotate the first - stage ladder 1 around the bolt to the position where it overlaps with the first limit block 203 of the second - stage ladder 2. At this position, the lower surface of the first - stage ladder 1 coincides with the upper surface of the second - stage ladder 2, and the first - stage ladder 1 is located inside the second - stage ladder 2. In this state, the spring limit pin 12 can be inserted into the first pin hole 202 of the second - stage ladder 2 for fixation.

[0042] The structure of the folding ladder for on - vehicle construction machinery in this embodiment from a certain perspective in the second folding step is as Figure 3 shown.

[0043] In the second folding step, rotate the second - stage ladder 2 around the rotary hinge seat 5 to the position where it overlaps with the second limit block 303 of the third - stage ladder 3. At this position, the upper surface of the second - stage ladder 2 coincides with the upper surface of the second limit block 303 of the third - stage ladder 3, and the first - stage ladder 1 is located inside the second - stage ladder 2 and the third - stage ladder 3.

[0044] The structure of the folding ladder for on - vehicle construction machinery in this embodiment from a certain perspective in the first telescoping step is as Figure 4 shown.

[0045] In the first telescoping step, rotate the third - stage ladder 3 around the connecting rod 6 to be parallel to the fourth - stage ladder 4, and then slide the third - stage ladder 3 and the connecting rod 6 along the chute 402 in the fourth - stage ladder 4 to the innermost limit position, so that the third - stage ladder 3 is completely in the internal space of the fourth - stage ladder 4.

[0046] In this state, the first - stage ladder 1 and the second - stage ladder 2 do not enter the interior of the fourth - stage ladder 4, but are located above the fourth - stage ladder 4 and remain parallel.

[0047] The structure of the folding ladder for on - vehicle construction machinery in this embodiment from a certain perspective in the second telescoping step is shown as Figure 5 shown.

[0048] In the second step of telescoping, the fourth - stage ladder 4 is slid along the telescoping slide rail 8 to the innermost limit position. At this time, the fourth - stage ladder 4 is completely located in the internal space of the storage box 9. At the same time, in this state, the first - stage ladder 1, the second - stage ladder 2, and the third - stage ladder 3 are also completely located in the internal space of the storage box 9. This state is the fully - stored state of this embodiment.

[0049] Preferably, the structure of the first - stage ladder of the folding ladder for on - vehicle construction machinery in this embodiment is as Figure 6 shown.

[0050] The first - stage ladder 1 includes: a first through - hole 101 and a first pin seat 102. The head of the first - stage ladder 1 is provided with a first through - hole 101, which is hinged to the second through - hole 201 of the second - stage ladder 2. A first pin seat 102 is provided in the middle, which is used to install the spring limit pin 12 and is combined with the first pin hole 202 of the second - stage ladder 2 to fix the first - stage ladder 1 in the folded state.

[0051] Preferably, the structure of the second - stage ladder of the folding ladder for on - vehicle construction machinery in this embodiment is as Figure 7 shown:

[0052] The second - stage ladder 2 includes: a second through - hole 201, a first pin hole 202, a first limit block 203, a second connection hole 204, and a first limit tube 205. The head of the second - stage ladder 2 is provided with a second connection hole 204, which is connected to the hinge head 502 of the rotary hinge seat 5. A first pin hole 202 is provided in the middle, which is combined with the first pin seat 102 of the first - stage ladder 1. At the same time, a first limit block 203 is welded in the middle to limit the first - stage ladder 1 in the folded state. The second through - hole 201 at the tail is hinged to the first through - hole 101 of the first - stage ladder 1. The first limit tube 205 is used to limit the first - stage ladder 1 in the unfolded state.

[0053] Preferably, the structure of the third - stage ladder of the folding ladder for on - vehicle construction machinery in this embodiment is as Figure 8 shown:

[0054] The third - stage ladder 3 includes: a fixed handle 301, a third connection hole 302, a second limit block 303, and a third through - hole 304. The head of the third - stage ladder 3 is provided with a third through - hole 304, which is combined with the chute 402 and the connecting rod 6 of the fourth - stage ladder 4 for rotational connection and sliding connection. A second limit block 303 is provided in the middle to limit the second - stage ladder 2 in the folded state. The third connection hole 302 at the tail is connected to the hinge frame 501 of the rotary hinge seat 5. The fixed handle 301 is used for the telescoping movement of the fourth - stage ladder 4.

[0055] Preferably, the structure of the fourth - stage ladder of the folding ladder for on - vehicle construction machinery in this embodiment is as Figure 9 shown:

[0056] The fourth - stage ladder 4 includes: a fourth ladder frame 401, a chute 402, a roller hole 403, a limit plate hole 404, a slide rail connection hole 405, and a spring pin hole 406; the fourth ladder frame 401 is used to support the overall structure and accommodate the third - stage ladder 3; the chute 402 is combined with the connecting rod 6 and the third through - hole 304 of the third - stage ladder 3 for the lateral sliding and limiting of the third - stage ladder 3; the roller hole 403 is connected to the rubber roller 7 to guide the third - stage ladder 3 during the telescopic sliding process; the limit plate hole 404 is used to fix the limit plate 11 to limit the angle of the third - stage ladder 3 in the unfolded state; the slide rail connection hole 405 is fixedly connected to the telescopic slide rail 8 for the secondary expansion of the fourth - stage ladder 4; the spring pin hole 406 is used to install the spring limit pin 12 to limit the fourth - stage ladder 4 in the unfolded state.

[0057] Preferably, the rotary hinge seat structure of the foldable ladder for on - vehicle construction machinery in this embodiment is as Figure 10 shown:

[0058] The rotary hinge seat 5 includes three structural components: a hinge seat frame 501, a hinge seat head 502, and a nylon cushion block 503, which are mainly used for the rotational connection between the second - stage ladder 2 and the third - stage ladder 3.

[0059] One end of the hinge seat frame 501 is combined with the third connection hole 302 of the third - stage ladder 3, one end of the hinge seat head 502 is combined with the second connection hole 204 of the second - stage ladder 2, and the other ends of the hinge seat frame 501 and the hinge seat head 502 are hinged to each other; the nylon cushion block 503 is installed on the hinge seat frame 501 to limit the second - stage ladder 2 in the unfolded state.

[0060] The above - mentioned is only the preferred embodiment of the present utility model. It should be pointed out that: for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A vehicle-mounted folding ladder for engineering machinery, characterized in that: include: A first step ladder (1), a second step ladder (2), a third step ladder (3), a fourth step ladder (4), a rotating hinge seat (5), a connecting rod (6), a rubber roller (7), a telescopic slide rail (8), a storage box (9), a mounting seat (10), and a limit plate (11); the first step ladder (1) is rotatably connected to the second step ladder (2) by bolts, and the second step ladder (2) is rotatably connected to the third step ladder (3) by a rotating hinge seat (5); the third step ladder (3) is rotatably connected to the fourth step ladder (4) by a connecting rod (6), and the third step ladder (3) is slidably connected to the connecting rod (6) along the fourth step ladder slide groove (402), and the third step ladder (3) is stored in the fourth step ladder (4) under the support of the rubber roller (7); the fourth step ladder (4) is slidably connected to the storage box (9) by the telescopic slide rail (8).

2. The vehicle-mounted folding ladder for construction machinery according to claim 1, characterized in that: The folding ladder comprises at least an unfolded state and a folded state. In the unfolded state, the first step (1), the second step (2) and the third step (3) are in a straight line unfolded state and form a stable support angle with the fourth step (4); in the folded state, the first step (1), the second step (2) and the third step (3) are overlapped and stored in a storage box (9) through the fourth step (4).

3. The vehicle-mounted folding ladder for construction machinery according to claim 2, characterized in that: The length of the first step (1) is smaller than the length of the second step (2), and the length of the second step (2) is larger than the length of the third step (3).

4. The vehicle-mounted folding ladder for construction machinery according to claim 2, characterized in that: A spring limiting pin (12) is arranged on the first step ladder (1) and is used for limiting and fixing the entire folding ladder.

5. The vehicle-mounted folding ladder for construction machinery according to claim 4, characterized in that: In the unfolded state, the first step (1) rotates around the bolt to a parallel state with the second step (2), and is limited by the round steel below the second step; in the folded state, the lower surface of the first step (1) rotates to a position overlapping with the upper surface of the second step (2), is limited by the upper limit block of the second step, and is fixed by inserting the spring limit pin (12) into the side hole of the second step.

6. The vehicle-mounted folding ladder for construction machinery according to claim 4, characterized in that: In the unfolded state, the second step ladder (2) rotates to a parallel state with the third step ladder (3) and is limited by a pad inside the rotating hinge seat (5); in the folded state, the upper surface of the second step ladder (2) rotates to a position overlapping with the third step ladder (3) and is limited by an upper limit block of the third step ladder, and the first step ladder (1) is located inside the second step ladder (2) and the third step ladder (3).

7. The vehicle-mounted folding ladder for construction machinery according to claim 1, characterized in that: The interior of the connection between the third step ladder (3) and the fourth step ladder (4) is in a hollow state and is provided with a slide groove (402).

8. The vehicle-mounted folding ladder for construction machinery according to claim 7, characterized in that: In the unfolded state, the third ladder (3) slides along the fourth ladder slide groove (402) to the outer limit position, and then rotates to the limit plate (11) through the connecting rod (6), and the limit plate (11) is used to limit the rotation angle of the third ladder; In the folded state, the third ladder (3) is rotated to a parallel state with the fourth ladder (4) through the connecting rod (6), and then slides along the fourth ladder slide groove (402) to the inner limit position, so that the third ladder (3) is retracted into the fourth ladder (4), and the first ladder (1) and the second ladder (2) are arranged above the fourth ladder (4).

9. The vehicle-mounted folding ladder for construction machinery according to claim 1, characterized in that: In the unfolded state, the fourth step ladder (4) slides along the telescopic slide rail (8) to the outermost limit position and is fixed by inserting the spring limit pin (12) into the groove of the lower plate of the storage box (9); in the folded state, the fourth step ladder (4) slides along the telescopic slide rail (8) to the innermost limit position and is completely located inside the storage box (9).

10. The vehicle-mounted folding ladder for construction machinery according to claim 1, characterized in that: The storage box (9) and the mounting seat (10) are fixed by bolts, and the mounting seat (10) is used to connect and install the folding lifting device on a vehicle-mounted engineering machinery.

Images