Mobile climbing ladder and engineering vehicle

Abstract

The present application relates to the technical field of climbing ladder, and discloses a movable climbing ladder and an engineering vehicle, the movable climbing ladder comprising a first climbing ladder section and a second climbing ladder section, the second climbing ladder section being connected with the first climbing ladder section through a rotating structure; the rotating structure comprising a first stop structure and a second stop structure arranged between the first climbing ladder section and the second climbing ladder section, the first stop structure being used for limiting the second climbing ladder section in a first clamping angle with the first climbing ladder section, and the second stop structure being used for limiting the second climbing ladder section in a second clamping angle with the first climbing ladder section. The first stop structure is used for limiting the second climbing ladder section when the second climbing ladder section is lowered, and the second stop structure is used for limiting the second climbing ladder section when the second climbing ladder section is lifted, so that the lowering and lifting of the climbing ladder are limited in two directions, the climbing ladder can be stably taken, placed and used, and the problem of inconvenient use of the movable climbing ladder is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of climbing ladders, in particular to a movable climbing ladder and an engineering vehicle. BACKGROUND

[0002] During maintenance, the engineering vehicle needs to climb onto the walkway through the climbing ladder. However, due to the wheel spacing limitation, some parts of the engineering vehicle, such as the middle and rear part of the automobile crane, cannot be designed or arranged with fixed climbing ladders, so movable climbing ladders are needed.

[0003] At present, the movable climbing ladder is divided into two or more sections, and the hinge structure between adjacent sections has no limit, which is inconvenient to take and put.

[0004] In order to solve this technical problem, the prior art also proposes to limit the rotation between the sections of the movable climbing ladder, but usually only sets the limit when the climbing ladder is used to put down, and there is no limit when the climbing ladder is lifted to store, which leads to the inconvenience of taking, storing and putting the climbing ladder. SUMMARY

[0005] Therefore, the present application provides a movable climbing ladder and an engineering vehicle to solve the problem of no limit of lifting and putting down the climbing ladder, which leads to the inconvenience of taking.

[0006] In the first aspect, the present application provides a movable climbing ladder, which comprises a first climbing ladder section and a second climbing ladder section, and the second climbing ladder section is rotationally connected with the first climbing ladder section through a rotation structure; the rotation structure comprises a first stop structure and a second stop structure arranged between the first climbing ladder section and the second climbing ladder section, and the first stop structure and the second stop structure are adapted to limit the rotation angle range of the second climbing ladder section relative to the first climbing ladder section; the first stop structure is used to limit the second climbing ladder section in a first clamping angle state between the first climbing ladder section, and the second stop structure is used to limit the second climbing ladder section in a second clamping angle state relative to the first climbing ladder section.

[0007] Beneficial effects: By setting the first ladder section, the movable ladder and the support or walkway of the engineering vehicle can be connected to fix the movable ladder. By setting the second ladder section, the second ladder section and the first ladder section are rotationally connected to facilitate use and storage. By setting the first stop structure and the second stop structure, the rotation angle range of the second ladder section relative to the first ladder section can be limited. When the first stop structure acts, the second ladder section and the first ladder section can be limited at a first included angle. At this time, the movable ladder is in a use state and can be used for climbing. When the second stop structure acts, the second ladder section and the first ladder section can be limited at a second included angle. At this time, the movable ladder is in a storage state and is convenient to store. Through the first stop structure, the second ladder section is limited when it is lowered. Through the second stop structure, the second ladder section is limited when it is lifted. Thus, the lowering and lifting of the ladder is bidirectionally limited, so that the ladder can be stably taken, placed and used, and the problem of inconvenient use of the movable ladder is solved.

[0008] In an optional embodiment, the rotating structure includes a first connecting arm and a second connecting arm, the first connecting arm is connected with the first ladder section, the second connecting arm is connected with the second ladder section, and the first connecting arm and the second connecting arm are rotationally connected through a first rotation shaft; the first stop structure includes a first limiting surface arranged on the first connecting arm and a second limiting surface arranged on the second connecting arm, and the first limiting surface and the second limiting surface are adapted to abut against each other.

[0009] Beneficial effects: The first limiting surface and the second limiting surface abut against each other to limit the angle of lowering of the second ladder section, which is simple in structure, convenient to process and reliable in limiting.

[0010] In an optional embodiment, the first connecting arm includes a first hinged plate and a first limiting plate connected with each other, the first limiting surface is arranged on the first limiting plate, and the first limiting surface and the longitudinal beam of the first ladder section form a third included angle; the second connecting arm includes a second hinged plate and a second limiting plate connected with each other, and the second hinged plate is rotationally connected with the first hinged plate; the second limiting surface is arranged on the second limiting plate, the second limiting surface and the longitudinal beam of the second ladder section form a fourth included angle, and the sum of the first included angle, the third included angle and the fourth included angle is 360°.

[0011] Beneficial effects: By arranging the first hinged plate, the first limiting plate, the second hinged plate and the second limiting plate, the first hinged plate and the second hinged plate are rotationally connected, and the first stop structure is arranged on the first limiting plate and the second limiting plate, which do not affect each other and are more reasonable in structure.

[0012] In an optional embodiment, the second stop structure includes a third limiting surface arranged on the first connecting arm and a fourth limiting surface arranged on the second connecting arm, and the third limiting surface and the fourth limiting surface are adapted to abut against each other.

[0013] Beneficial effects: the third limiting surface and the fourth limiting surface abut to limit the angle of the second ladder section, simple structure, easy to process, reliable limiting.

[0014] In an alternative embodiment, the third limiting surface is arranged on the first limiting plate, and the fourth limiting surface is arranged on the second hinged plate; and / or, the third limiting surface is arranged on the first hinged plate, and the fourth limiting surface is arranged on the second limiting plate.

[0015] Beneficial effects: only one second stop structure is arranged on one side, which can limit the position, and the structure is simple. If second stop structures are arranged on both sides, the second stop structures on both sides can share the stress, and the limiting effect is more reliable and stable.

[0016] In an alternative embodiment, the first hinged plate and the first limiting plate are arranged in an L-shaped structure, the second hinged plate and the second limiting plate are arranged in an L-shaped structure, and the first connecting arm and the second connecting arm are connected in opposite cooperation.

[0017] Beneficial effects: in this way, two second stop structures are formed between the first connecting arm and the second connecting arm, and after the first connecting arm and the second connecting arm are connected in opposite cooperation, the space occupied is small.

[0018] In an alternative embodiment, the first ladder section includes two first longitudinal beams arranged side by side, the second ladder section includes two second longitudinal beams arranged side by side, the first connecting arm is detachably connected with the first longitudinal beam, and the second connecting arm is detachably connected with the second longitudinal beam.

[0019] Beneficial effects: the first connecting arm and the first longitudinal beam are arranged in detachable connection, and the second connecting arm and the second longitudinal beam are arranged in detachable connection, which facilitates maintenance and replacement and reduces maintenance costs.

[0020] In an alternative embodiment, the front end of the first ladder section is provided with a mounting plate, the mounting plate is provided with a mounting hole, and the first ladder section is adapted to be connected with the walkway or the support of the engineering vehicle through the mounting hole via fasteners.

[0021] Beneficial effects: by arranging the mounting plate and the mounting hole on the mounting plate, the first ladder section can be connected to the walkway or the support of the engineering vehicle through fasteners, thereby fixing the movable ladder.

[0022] In an alternative embodiment, a bounce-preventing device is arranged between the first ladder section and the second ladder section, the bounce-preventing device includes a limiting swing arm and a limiting column, one end of the limiting swing arm is rotatably connected with the first ladder section through a second rotating shaft, the limiting column is fixedly arranged on the second ladder section, the limiting swing arm is provided with a limiting sliding groove matched with the limiting column, the limiting column is slidably arranged in the limiting sliding groove, and the limiting sliding groove is adapted to lock the second ladder section in a use state.

[0023] Beneficial effects: When the second ladder section is lowered to the use state, the limiting column located in the second ladder section is in the limiting slot, and the side wall of the limiting slot is abutted and limited, so that the second ladder section is locked and cannot be reversely rotated, thereby solving the problem of rebounding injury caused by personnel stepping off.

[0024] In an alternative embodiment, the limiting sliding groove comprises a first groove section and a second groove section in communication with each other, the first groove section is matched with the limiting column to limit the rotation of the second ladder section relative to the first ladder section, and the second groove section is matched with the limiting column to allow the rotation of the second ladder section relative to the first ladder section.

[0025] Beneficial effects: By setting the first groove section and the second groove section, when the limiting column slides into the first groove section, the limiting column and the side wall of the limiting slot are abutted, which can limit the upward rotation of the second ladder section; when the limiting column is separated from the first groove section and enters the second groove section, the limiting swing arm can swing with the rotation of the second ladder section, and the second ladder section can be retracted.

[0026] In an alternative embodiment, the limiting swing arm is a bent structure, and when the second ladder section is in the use state, the limiting swing arm overlaps the longitudinal beam of the second ladder section.

[0027] Beneficial effects: In this way, when the second ladder section is lowered to the use state, the limiting swing arm does not protrude vertically from the second swing arm section, which can avoid occupying extra space or causing accidental injury to personnel.

[0028] In a second aspect, the present application also provides an engineering vehicle comprising a vehicle body and the movable ladder according to any one of the above technical solutions, wherein the vehicle body is provided with a walkway, and the movable ladder is arranged on the walkway.

[0029] Beneficial effects: Because the engineering vehicle comprises the movable ladder, it has the same effects as the movable ladder, which will not be described here.

[0030] In an alternative embodiment, the first ladder section of the movable ladder and the walkway are rotationally connected through a third rotation shaft, and the third rotation shaft is arranged perpendicularly to the longitudinal beam of the first ladder section.

[0031] Beneficial effects: In this way, the convenience of the conversion between the use and storage states of the movable ladder can be improved.

[0032] In an alternative embodiment, the walkway is provided with a locking device, and the movable ladder is adapted to rotate to the upper side of the walkway around the third rotation shaft and is locked and connected to the walkway through the locking device.

[0033] Beneficial effects: By setting the locking device, when the movable ladder is not used, the movable ladder can be locked and connected to the walkway of the engineering vehicle, which can prevent the movable ladder from sliding or jumping during driving and improve safety. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings required to be used in the specific embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0035] Figure 1 A front view of a movable ladder in a use state according to an embodiment of the present application;

[0036] Figure 2 A side view of the movable ladder shown in FIG. 1; Figure 1

[0037] Figure 3 An enlarged structural schematic view of a part A in FIG. 2; Figure 2

[0038] Figure 4 A perspective view of a rotating structure in FIG. 3; Figure 3

[0039] Figure 5 A top view of the movable ladder shown in FIG. 4; Figure 1

[0040] Figure 6 A front view of the movable ladder in a storage state according to an embodiment of the present application; Figure 1

[0041] Figure 7 A side view of the movable ladder shown in FIG. 5; Figure 6

[0042] Figure 8 An enlarged structural schematic view of a part B in FIG. 6; Figure 7

[0043] Figure 9 A top view of the movable ladder shown in FIG. 7; Figure 6

[0044] Figure 10 A side view of the movable ladder containing an anti-bounce device in a use state according to an embodiment of the present application;

[0045] Figure 11 An enlarged structural schematic view of a part C in FIG. 8; Figure 10

[0046] Figure 12 A side view of the movable ladder in a storage state according to an embodiment of the present application; Figure 10

[0047] Figure 13 An enlarged structural schematic view of a part D in FIG. 9;​​​​​​​​​​Figure 12 Partial enlarged structural schematic view at D in FIG. 1;

[0048] Figure 14 Side view of the active ladder connected with the walkway in use;

[0049] Figure 15 Front view as shown in FIG. 1; Figure 14

[0050] Top view as shown in FIG. 1; Figure 16 Figure 15 Axial view of the active ladder connected with the walkway in storage;

[0051] Figure 17 Axial view of the active ladder connected with the walkway in locking connection;

[0052] Figure 18 Partial enlarged structural schematic view at E in FIG. 1.

[0053] Figure 19 Explanation of reference signs: Figure 18

[0054] 1, first ladder section; 11, first longitudinal beam; 12, mounting plate; 13, mounting hole; 14, third rotating shaft; 15, stepping plate; 16, grab rail; 2, second ladder section; 21, second longitudinal beam; 3, rotating structure; 31, first stop structure; 311, first limiting surface; 312, second limiting surface; 32, second stop structure; 321, third limiting surface; 322, fourth limiting surface; 33, first connecting arm; 331, first hinged plate; 332, first limiting plate; 34, second connecting arm; 341, second hinged plate; 342, second limiting plate; 35, first rotating shaft; 4, anti-bouncing device; 41, limiting swing arm; 42, limiting column; 411, limiting sliding groove; 4111, first groove section; 4112, second groove section; 43, second rotating shaft; 5, walkway; 6, locking device; 61, mounting groove; 62, pin; 7, first elastic pad; 8, second elastic pad; 9, third elastic pad; 10, active ladder. DETAILED DESCRIPTION

[0055] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0056] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0057] The following will be described with reference to the drawings.​​Figures 1 to 19 The following describes embodiments of the present invention.

[0058] According to an embodiment of the present invention, in one aspect, a movable ladder 10 is provided, such as... Figure 2 As shown, the system includes a first climbing section 1, a second climbing section 2, and a rotating structure 3. The second climbing section 2 is rotatably connected to the first climbing section 1 via the rotating structure 3. The rotating structure 3 includes a first stop structure 31 and a second stop structure 32 disposed between the first climbing section 1 and the second climbing section 2. The first stop structure 31 and the second stop structure 32 are adapted to limit the rotation angle range of the second climbing section 2 relative to the first climbing section 1. The first stop structure 31 is used to confine the second climbing section 2 to a working state with the first climbing section 1 at a first angle α within the rotation angle range. The second stop structure 32 is used to confine the second climbing section 2 to a storage state with the first climbing section 1 at a second angle β within the rotation angle range.

[0059] By providing a first ladder section 1, the movable ladder 10 can be connected to the support or walkway 5 of the engineering vehicle to fix the movable ladder 10. A second ladder section 2 is provided, rotatably connected to the first ladder section 1 for ease of use and storage. A first stop structure 31 and a second stop structure 32 limit the rotation angle range of the second ladder section 2 relative to the first ladder section 1. When the first stop structure 31 is in action, it limits the second ladder section 2 and the first ladder section 1 to a first included angle α. At this time, the movable ladder 10 is in a position such that… Figure 2 As shown in the usage state, it can be used for climbing. When the second stop structure 32 is activated, it can limit the second climbing ladder section 2 and the first climbing ladder section 1 to the second included angle β. At this time, the movable climbing ladder 10 is in the position shown. Figure 7 or Figure 9 The storage state shown is convenient for storage. The first stop structure 31 limits the lowering of the second ladder section 2, and the second stop structure 32 limits the lifting of the second ladder section 2, thereby achieving bidirectional limiting of the ladder's lowering and lifting, thus enabling stable retrieval and use of the ladder.

[0060] In one embodiment, such as Figure 4 As shown, the rotating structure 3 includes a first connecting arm 33 and a second connecting arm 34. The first connecting arm 33 is connected to the first climbing ladder section 1, and the second connecting arm 34 is connected to the second climbing ladder section 2. The first connecting arm 33 and the second connecting arm 34 are rotatably connected by a first rotating shaft 35.

[0061] By setting the first connecting arm 33 and the second connecting arm 34 to connect to the first climbing ladder section 1 and the second climbing ladder section 2 respectively, the first stop structure 31 and the second stop structure 32 are set on the first connecting arm 33 and the second connecting arm 34. Compared with setting the first stop structure 31 and the second stop structure 32 directly on the first climbing ladder section 1 and the second climbing ladder section 2, the processing is more convenient.

[0062] In one embodiment, such as Figure 8 As shown, the first stop structure 31 includes a first limiting surface 311 disposed on the first connecting arm 33 and a second limiting surface 312 disposed on the second connecting arm 34, the first limiting surface 311 and the second limiting surface 312 being adapted to abut against each other.

[0063] A first limiting surface 311 is provided on the first connecting arm 33, and a second limiting surface 312 is provided on the second connecting arm 34. When the movable ladder 10 is used, the second ladder section 2 is lowered. The second ladder section 2 rotates around the first rotating shaft 35. When the first limiting surface 311 of the first connecting arm 33 and the second limiting surface 312 of the second connecting arm 34 abut against each other, the second ladder section 2 is lowered into place. At this time, the second ladder section 2 is in the position shown in the figure. Figure 2 In the usage state shown, the second climbing section 2 and the first climbing section 1 form a first included angle α. The lowering angle of the second climbing section 2 is limited by the abutment of the first limiting surface 311 and the second limiting surface 312. The structure is simple, easy to manufacture, and the limiting is reliable.

[0064] In one embodiment, such as Figure 4 and Figure 8 As shown, the first connecting arm 33 includes a first hinge plate 331 and a first limiting plate 332 connected to each other. A first limiting surface 311 is disposed on the first limiting plate 332. The first limiting surface 311 and the longitudinal beam of the first climbing ladder section 1 form a third included angle γ. The second connecting arm 34 includes a second hinge plate 341 and a second limiting plate 342 connected to each other. The second hinge plate 341 and the first hinge plate 331 are rotatably connected. The second limiting surface 312 is disposed on the second limiting plate 342. The second limiting surface 312 and the longitudinal beam of the second climbing ladder section 2 form a fourth included angle θ. The sum of the first included angle α, the third included angle γ, and the fourth included angle θ is 360°.

[0065] Specifically, the size of the first included angle α reflects the preset descent degree of the second climbing section 2. That is, the larger the first included angle α is, the smaller the inclination angle of the second climbing section 2 relative to the ground, and the gentler it is; the smaller the first included angle α is, the larger the inclination angle of the second climbing section 2 relative to the ground, and the steeper it is. The size of the first included angle α depends on the sum of the third included angle γ and the fourth included angle θ. The smaller the sum of the third included angle γ and the fourth included angle θ, the larger the first included angle α, and vice versa. The third included angle γ and the fourth included angle θ can be the same or different.

[0066] By setting the first hinge plate 331, the first limiting plate 332, the second hinge plate 341 and the second limiting plate 342, the first hinge plate 331 and the second hinge plate 341 are rotationally connected, the first stop structure 31 is arranged on the first limiting plate 332 and the second limiting plate 342, and they do not affect each other, and the structure is more reasonable. Specifically, if the first included angle a is too large, the movable ladder 10 occupies a larger space when in use; if the first included angle a is too small, the second ladder section 2 is too steep, which is not conducive to climbing. Therefore, by controlling the third included angle γ and the fourth included angle θ, the first included angle a can be controlled within a reasonable range, for example, the first included angle a is within the range of 90° to 145°.

[0067] In one embodiment, the third included angle γ and the fourth included angle θ are equal and are controlled between 45° and 72.5°. The specific angle size is determined according to whether there is an obstacle below the second ladder section 2 after it is placed down and the size of the bearing weight.

[0068] In one embodiment, the first angle is 106 degrees, which ensures that the movable ladder 10 is angle-limited when in use, facilitating taking and placing.

[0069] In one embodiment, as shown in Figure 3 The second stop structure 32 includes a third limiting surface 321 arranged on the first connecting arm 33 and a fourth limiting surface 322 arranged on the second connecting arm 34, and the third limiting surface 321 and the fourth limiting surface 322 are adapted to abut each other.

[0070] The third limiting surface 321 is arranged on the first connecting arm 33, and the fourth limiting surface 322 is arranged on the second connecting arm 34. When the movable ladder 10 needs to be folded after use, the second ladder section 2 is lifted, and the second ladder section 2 rotates around the first rotating shaft 35. When the third limiting surface 321 of the first connecting arm 33 and the fourth limiting surface 322 of the second connecting arm 34 abut each other, the second ladder section 2 is lifted in place. At this time, the second ladder section 2 is in the storage state as shown in Figure 7 The third limiting surface 321 and the fourth limiting surface 322 abut each other to limit the angle of the second ladder section 2, which is simple in structure, easy to process, and reliable in limiting.

[0071] Specifically, in one embodiment, when the third limiting surface 321 and the fourth limiting surface 322 abut against each other, the second ladder section 2 and the first ladder section 1 are parallel, i.e., the second included angle β between the second ladder section 2 and the first ladder section 1 is 180°. In the prior art, the ladder is lifted without limiting, and when the whole ladder is lifted, the rotating structure between the second ladder section and the first ladder section has a rotating degree of freedom and is not easy to control. However, in the embodiment, the third limiting surface 321 and the fourth limiting surface 322 abut against each other to limit the angle of lifting the second ladder section 2, so that the whole ladder is easily lifted and rotated on the horizontal plane.

[0072] In one embodiment, as shown in Figure 4 the third limiting surface 321 is arranged on the first limiting plate 332, and the fourth limiting surface 322 is arranged on the second hinged plate 341; and / or, the third limiting surface 321 is arranged on the first hinged plate 331, and the fourth limiting surface 322 is arranged on the second limiting plate 342.

[0073] That is, one second stop structure can be arranged on either side of the first hinged plate 331 and the second hinged plate 341, or second stop structures can be arranged on both sides of the first hinged plate 331 and the second hinged plate 341. Arranging one second stop structure on one side can limit the position and has a simple structure. If second stop structures are arranged on both sides, the second stop structures on both sides can share the stress, and the limiting effect is more reliable and stable.

[0074] In one embodiment, the first hinged plate 331 and the first limiting plate 332 are arranged in an L-shaped structure, the second hinged plate 341 and the second limiting plate 342 are arranged in an L-shaped structure, and the first connecting arm 33 and the second connecting arm 34 are relatively connected.

[0075] Specifically, the first hinged plate 331 and the second hinged plate 341 are rotationally connected through the first rotating shaft 35, the first limiting plate 332 and the second limiting plate 342 are respectively located on both ends of the first rotating shaft 35, two second stop structures are formed between the first connecting arm 33 and the second connecting arm 34, and after the first connecting arm 33 and the second connecting arm 34 are connected in a butt joint manner, the space occupied is small.

[0076] In one embodiment, the structure of the first connecting arm 33 is the same as that of the second connecting arm 34.

[0077] In one embodiment, in order to realize the second stop structure and not affect the relative rotation between the first hinged plate 331 and the second hinged plate 341, the first hinged plate 331 is a plate-shaped body with a substantially fan-shaped cross section, and the side of the first hinged plate 331 facing the fourth limiting surface 322 is arranged in an arc shape. Meanwhile, the second hinged plate 341 is a plate-shaped body with a substantially fan-shaped cross section, and the side of the second hinged plate 341 facing the fourth limiting surface 322 is arranged in an arc shape.

[0078] In one embodiment, the first connecting arm 33 and the second connecting arm 34 are integrally casted in steel material. In this way, the first connecting arm 33 and the second connecting arm 34 can have strong rigidity, meet the stress demand generated when a large weight person steps on, avoid breakage and other problems, and improve the reliability of the movable ladder 10 as a whole.

[0079] In one embodiment, as shown in Figure 1 , the first ladder section 1 includes two first longitudinal beams 11 arranged side by side, the second ladder section 2 includes two second longitudinal beams 21 arranged side by side, the first connecting arm 33 is detachably connected with the first longitudinal beam 11, and the second connecting arm 34 is detachably connected with the second longitudinal beam 21.

[0080] Specifically, as shown in Figure 5 , the first connecting arm 33, the first longitudinal beam 11, the second connecting arm 34, and the second longitudinal beam 21 are all provided with connecting holes, the first connecting arm 33 and the first longitudinal beam 11 are connected through bolts via the connecting holes, and the second connecting arm 34 and the second longitudinal beam 21 are connected through bolts, so as to realize detachable connection.

[0081] Since the rotating connection structure is a component that bears a large stress during use of the movable ladder 10, the rotating connection structure has a high maintenance frequency. By setting the first connecting arm 33 and the first longitudinal beam 11 to be detachably connected, and setting the second connecting arm 34 and the second longitudinal beam 21 to be detachably connected, maintenance and replacement are facilitated, and maintenance cost is reduced. Compared with the scheme of fixed connection between the first connecting arm 33 and the first longitudinal beam 11, and fixed connection between the second connecting arm 34 and the second longitudinal beam 21, when the rotating structure 3 is damaged, the first ladder section 1 or the second ladder section 2 does not need to be replaced as a whole, and maintenance cost is reduced.

[0082] In one embodiment, as shown in Figure 5 , the front end of the first ladder section 1 is provided with a mounting plate 12, the mounting plate 12 is provided with a mounting hole 13, and the first ladder section 1 is adapted to be connected with the walkway 5 or the support of the engineering vehicle via the mounting hole 13 through fasteners. By setting the mounting plate 12 and the mounting hole 13 on the mounting plate 12, the first ladder section 1 can be connected to the walkway 5 or the support of the engineering vehicle through fasteners, thereby playing a role of fixing the movable ladder 10.

[0083] In one embodiment, as shown in Figure 10 and Figure 12As shown, the first ladder section 1 and the second ladder section 2 are provided with an anti-bounce device 4, which includes a limiting swing arm 41 and a limiting column 42. One end of the limiting swing arm 41 is rotatably connected to the first ladder section 1 through a second pivot 43, and the limiting column 42 is fixedly arranged on the second ladder section 2. The limiting swing arm 41 is provided with a limiting sliding groove 411 matched with the limiting column 42, and the limiting column 42 is slidably arranged in the limiting sliding groove 411. The limiting sliding groove 411 is adapted to lock the second ladder section 2 in the use state as shown. Figure 2 As shown in the use state.

[0084] Since there may be a person stepping on the air ladder 10 during use, the stepping force may cause the second ladder section 2 to bounce and injure people. Therefore, the anti-bounce device 4 is arranged. When the second ladder section 2 is lowered to the use state as shown, Figure 2 When the second ladder section 2 is lowered to the use state as shown,

[0085] In one embodiment, as shown, Figure 11 The limiting sliding groove 411 includes a first groove section 4111 and a second groove section 4112 which are in communication with each other. The first groove section 4111 is matched with the limiting column 42 and is used to limit the rotation of the second ladder section 2 relative to the first ladder section 1. The second groove section 4112 is matched with the limiting column 42 and allows the rotation of the second ladder section 2 relative to the first ladder section 1.

[0086] By arranging the first groove section 4111 and the second groove section 4112, when the limiting column 42 slides into the first groove section 4111, the limiting column 42 and the side wall of the limiting groove abut, as shown, Figure 11 which can limit the upward rotation of the second ladder section 2; when the limiting column 42 is separated from the first groove section 4111 and enters the second groove section 4112, as shown, Figure 13 the limiting swing arm 41 can swing with the rotation of the second ladder section 2, and the second ladder section 2 can be retracted.

[0087] In one embodiment, the limiting swing arm 41 is a bent structure, and when the second ladder section 2 is in the use state as shown, Figure 2 the limiting swing arm 41 and the longitudinal beam of the second ladder section 2 overlap.

[0088] In this way, when the second ladder section 2 is lowered to the use state as shown, Figure 2 the limiting swing arm 41 does not protrude vertically from the second swing arm section, which can play a role in avoiding occupying extra space or causing accidental injury to people.

[0089] In one embodiment, as shown in Figure 7 , the bottom of the first ladder section 1 is provided with a first elastic pad 7.

[0090] Since the first ladder section 1 needs to be connected to the walkway 5 or the support of the engineering vehicle, as shown in Figure 14 , by providing a first buffer pad at the bottom of the first ladder section 1, it can prevent scratching the walkway 5 or the support of the engineering vehicle.

[0091] In one embodiment, as shown in Figure 7 , the lower surface of the second ladder section 2 is connected with a second elastic pad 8.

[0092] Since the movable ladder 10 can be rotated to be flush with the first ladder section 1 when not in use, and then placed on the walkway 5 or the support of the engineering vehicle as a whole, the second elastic pad 8 is provided so that the second elastic pad 8 directly contacts the walkway 5 or the support of the engineering vehicle, playing an isolation and buffering role. On the one hand, it can prevent the movable ladder 10 from scratching the walkway 5 or the support of the engineering vehicle, and on the other hand, it can avoid abnormal noise caused by vibration when driving.

[0093] In one embodiment, as shown in Figure 5 and Figure 6 , the first ladder section 1 is connected with a grab rail 16,

[0094] In this way, the staff can hold the grab rail 16 during climbing up or down, improving the safety performance.

[0095] In one embodiment, the first longitudinal beam 11 of the first ladder section 1 and the second longitudinal beam 21 of the second ladder section 2 are both made of high-strength and lightweight aluminum profile. In a specific embodiment, the cross section of the aluminum profile is rectangular with a size of 25mm x 62mm, which can optimize the stress mode of the first longitudinal beam 11 and the second longitudinal beam 21 compared to the square cross section profile.

[0096] In this way, while ensuring the use strength of the movable ladder 10, the weight of the movable ladder 10 is reduced, and the workload of the operating personnel in using and storing the movable ladder 10 is reduced.

[0097] The movable ladder 10 provided in the embodiment has a profile structure for the first longitudinal beam 11 and the second longitudinal beam 21 except for the grab rail 16 located on the first ladder section 1, which occupies a small vertical space when the second ladder section 2 is placed flat for storage, and can meet the vertical placement requirements of different parts.

[0098] In one embodiment, the second ladder section 2 further includes a plurality of cross beams connected at intervals between the two second longitudinal beams 21, and the upper surface of the cross beam is provided with anti-slip lines.

[0099] In this way, the safety performance of the movable ladder 10 is improved.

[0100] In one embodiment, as shown in Figure 5 The first ladder section 1 further comprises a tread plate 15 connected between the two first longitudinal beams 11, and the upper surface of the tread plate 15 is provided with anti-skid lines.

[0101] In this way, the safety performance of the movable ladder 10 is improved.

[0102] According to the embodiment of the present application, in another aspect, there is also provided an engineering vehicle comprising a vehicle body and the movable ladder 10 of any one of the above technical solutions, wherein the vehicle body is provided with a walkway 5, and the movable ladder 10 is arranged on the walkway 5.

[0103] Because the engineering vehicle comprises the movable ladder 10, the same effects as the movable ladder 10 are achieved, and thus will not be described here.

[0104] In one embodiment, the mounting plate 12 of the first ladder section 1 of the movable ladder 10 is rotationally connected to the walkway 5 through a third rotation shaft 14.

[0105] The first ladder section 1 and the walkway 5 are rotationally connected through the third rotation shaft 14, so that the first ladder section 1 can rotate relative to the walkway 5, thereby, when the movable ladder 10 is used, the movable ladder 10 is rotated as a whole around the third rotation shaft 14, the second ladder section 2 is rotated to be away from the walkway 5, and the movable ladder 10 can be used in a lowered state. After the use of the movable ladder 10 is completed, the second ladder section 2 is lifted, and the movable ladder 10 is rotated as a whole around the third rotation shaft 14, so that the movable ladder 10 is rotated to be above the walkway 5, and the movable ladder 10 can be stored on the walkway 5. In this way, the convenience of the transition between the use and storage of the movable ladder 10 can be improved.

[0106] Further, as shown in Figure 16 and Figure 17 In one embodiment, the third rotation shaft 14 is a bolt. On the one hand, the bolt can function as a rotation shaft, and on the other hand, the bolt can be used to achieve the detachable connection between the movable ladder 10 and the walkway 5, thereby facilitating the maintenance and replacement.

[0107] In one embodiment, as shown in Figures 15 to 19 The walkway 5 is provided with a locking device 6, and the movable ladder 10 is adapted to be rotated around the third rotation shaft 14 to be above the walkway 5 and to be locked and connected to the walkway 5 through the locking device 6.

[0108] When the movable ladder 10 is not used, the movable ladder 10 is rotated around the third rotation shaft 14 from the state shown in Figure 17 to the state shown in Figure 18The locking device 6 is set to lock the movable ladder 10 to the walkway 5 of the engineering vehicle, as shown in the state. Figure 18 As shown, the movable ladder 10 is prevented from sliding or jumping during driving, and the safety is improved.

[0109] In an embodiment, as shown, the locking device 6 includes a mounting groove 61 matched with the second longitudinal beam 21 of the second ladder section 2. Figure 19 When the second longitudinal beam 21 is placed in the mounting groove 61, the mounting groove 61 can prevent the movable ladder 10 from swinging in the horizontal plane.

[0110] Further, in an embodiment, pin holes are provided on opposite groove walls of the mounting groove 61, and a pin 62 is inserted into the pin holes when the second longitudinal beam 21 is placed in the mounting groove 61. The pin 62 is located above the second longitudinal beam 21 and can prevent the movable ladder 10 from shaking up and down.

[0111] Further, in an embodiment, the pin 62 is a anti-extraction pin.

[0112] Specifically, the anti-extraction pin includes a connecting section and an anti-extraction section, and the connecting section and the anti-extraction section are elastically connected at one end. The connecting section is used to be inserted into the pin hole of the mounting groove 61 to prevent the movable ladder 10 from shaking up and down. The anti-extraction section automatically adheres to the connecting section under the elastic action, so that the anti-extraction pin 62 forms a closed structure and is sleeved on the mounting groove 61, thereby playing a anti-extraction role and reliably limiting the movable ladder 10.

[0113] Of course, other structures can also be provided to limit the up-and-down shaking of the second longitudinal beam 21, such as an elastic buckle provided on the inner wall of the mounting groove 61. The second longitudinal beam 21 is directly pressed into the mounting groove 61, and the elastic buckle is automatically reset to block the second longitudinal beam 21 and limit the second longitudinal beam 21 in the vertical direction.

[0114] In an embodiment, the walkway 5 is provided with a third elastic pad 9 near the edge.

[0115] In this way, when the movable ladder 10 is used, the first ladder section 1 is connected to the walkway 5, and the first longitudinal beam 11 of the first ladder section 1 is pressed on the third elastic pad 9 to prevent the movable ladder 10 from scratching the walkway 5.

[0116] Further, in an embodiment, the upper surface of the third elastic pad 9 is provided with a groove matched with the first longitudinal beam 11.

[0117] In this way, when the movable ladder 10 is used, the first longitudinal beam 11 of the first ladder section 1 is located in the groove of the third elastic pad, the groove limits the first longitudinal beam 11, prevents the movable ladder 10 from swinging in the horizontal direction, and improves the safety of the worker when climbing the ladder. At the same time, the third elastic pad 9 can also play a damping role during the worker's climbing process.

[0118] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A mobile ladder characterized in that, The utility model relates to a foldable ladder, comprising: a first ladder section (1); a second ladder section (2) rotatably connected to the first ladder section (1) by a rotating structure (3); the rotating structure (3) comprises a first stop structure (31) and a second stop structure (32) arranged between the first ladder section (1) and the second ladder section (2), the first stop structure (31) and the second stop structure (32) are adapted to limit the rotation angle range of the second ladder section (2) relative to the first ladder section (1), the first stop structure (31) is used for limiting the second ladder section (2) in a first included angle with the first ladder section (1) in a use state, and the second stop structure (32) is used for limiting the second ladder section (2) in a second included angle with the first ladder section (1) in a storage state; the rotating structure (3) comprises a first connecting arm (33) and a second connecting arm (34), the first connecting arm (33) is connected to the first ladder section (1), the second connecting arm (34) is connected to the second ladder section (2), and the first connecting arm (33) and the second connecting arm (34) are rotatably connected by a first rotating shaft (35); the first stop structure (31) comprises a first limiting surface (311) arranged on the first connecting arm (33) and a second limiting surface (312) arranged on the second connecting arm (34), and the first limiting surface (311) and the second limiting surface (312) are adapted to abut against each other; the second stop structure (32) comprises a third limiting surface (321) arranged on the first connecting arm (33) and a fourth limiting surface (322) arranged on the second connecting arm (34), and the third limiting surface (321) and the fourth limiting surface (322) are adapted to abut against each other.

2. The play climber of claim 1, wherein the first connecting arm (33) comprises a first hinged plate (331) and a first limiting plate (332) connected to each other, the first limiting surface (311) is arranged on the first limiting plate (332), and the first limiting surface (311) and the longitudinal beam of the first ladder section (1) form a third included angle; the second connecting arm (34) comprises a second hinged plate (341) and a second limiting plate (342) connected to each other, the second hinged plate (341) and the first hinged plate (331) are rotatably connected, the second limiting surface (312) is arranged on the second limiting plate (342), the second limiting surface (312) and the longitudinal beam of the second ladder section (2) form a fourth included angle, and the sum of the first included angle, the third included angle and the fourth included angle is 360°.

3. The play climber of claim 2, wherein, the third limiting surface (321) is arranged on the first limiting plate (332), the fourth limiting surface (322) is arranged on the second hinged plate (341), and / or the third limiting surface (321) is arranged on the first hinged plate (331), and the fourth limiting surface (322) is arranged on the second limiting plate (342).

4. The play climber of claim 2, wherein The first hinged plate (331) and the first limiting plate (332) are arranged in an L-shaped structure, the second hinged plate (341) and the second limiting plate (342) are arranged in an L-shaped structure, and the first connecting arm (33) and the second connecting arm (34) are connected in opposite cooperation.

5. The play climber of claim 1, wherein The first ladder section (1) comprises two first longitudinal beams (11) arranged side by side, the second ladder section (2) comprises two second longitudinal beams (21) arranged side by side, the first connecting arm (33) and the first longitudinal beam (11) are detachably connected, and the second connecting arm (34) and the second longitudinal beam (21) are detachably connected.

6. The play climber of claim 1, wherein The front end of the first ladder section (1) is provided with a mounting plate (12), the mounting plate (12) is provided with a mounting hole (13), and the first ladder section (1) is adapted to be connected with the walkway (5) or the support of the engineering vehicle through the mounting hole (13) via fasteners.

7. The play climber of claim 1, wherein The first ladder section (1) and the second ladder section (2) are provided with an anti-bounce device (4), the anti-bounce device (4) comprises a limiting swing arm (41) and a limiting column (42), one end of the limiting swing arm (41) is rotatably connected with the first ladder section (1) through a second rotating shaft (43), the limiting column (42) is fixedly arranged on the second ladder section (2), the limiting swing arm (41) is provided with a limiting sliding groove (411) matched with the limiting column (42), and the limiting column (42) is slidably arranged in the limiting sliding groove (411). The limiting sliding groove (411) is adapted to lock the second ladder section (2) in the use state.

8. The play climber of claim 7, wherein, The limiting sliding groove (411) comprises a first groove section (4111) and a second groove section (4112) in communication with each other, the first groove section (4111) is matched with the limiting column (42) and used for limiting rotation of the second ladder section (2) relative to the first ladder section (1), and the second groove section (4112) is matched with the limiting column (42) and allows the second ladder section (2) to rotate relative to the first ladder section (1).

9. The play climber of claim 8, wherein, The limiting swing arm (41) is of a bending structure, and the limiting swing arm (41) and the longitudinal beam of the second ladder section (2) overlap when the second ladder section (2) is in the use state.

10. An engineering vehicle characterized by, Comprise: A vehicle body provided with a walkway (5); The movable ladder (10) according to any one of claims 1 to 9 is arranged on the walkway (5).

11. The work vehicle of claim 10, characterized by, The first ladder section (1) of the movable ladder (10) and the walkway (5) are rotatably connected through a third rotating shaft (14).

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