CN117569728A - Movable cat ladder and engineering vehicle - Google Patents

Abstract

The invention relates to the technical field of ladders and discloses a movable ladder and an engineering vehicle, wherein the movable ladder comprises a first ladder section and a second ladder section, and the second ladder section is connected with the first ladder section through a rotating structure; the rotating structure comprises a first stop structure and a second stop structure which are arranged between the first ladder section and the second ladder section, the first stop structure is used for limiting the second ladder section to be in a use state of a first included angle with the first ladder section, and the second stop structure is used for limiting the second ladder section to be in a storage state of a second included angle with the first ladder section. According to the invention, the first stop structure is used for limiting the second ladder section when the second ladder section is lowered, and the second stop structure is used for limiting the second ladder section when the second ladder section is lifted, so that the two-way limiting of lowering and lifting of the ladder is realized, the ladder can be stably taken and placed and used, and the problem of inconvenient use of the movable ladder is solved.

Description

Movable cat ladder and engineering vehicle

Technical Field

The invention relates to the technical field of ladders, in particular to a movable ladder and an engineering vehicle.

Background

Engineering vehicle, during maintenance, need climb to the bench through the cat ladder. The engineering vehicle, such as an automobile crane, is limited by the wheel spacing, and has a certain part with limited structure, so that a fixed crawling ladder cannot be designed or arranged, such as the middle and rear parts of the engineering vehicle, and a movable crawling ladder is needed.

At present, the movable cat ladder is divided into two sections or a plurality of sections, the hinge structure between the adjacent sections is not limited, and the movable cat ladder is inconvenient to take and place.

In order to solve the technical problem, the prior art also sequentially provides a step for rotating and limiting the sections of the movable ladder, but the step is usually limited only when the ladder is put down for use, and the ladder is still in an infinite position when being lifted up for storage, so that the ladder is inconvenient to take, retract and release.

Disclosure of Invention

In view of the above, the invention provides a movable ladder stand and an engineering vehicle, which are used for solving the problem that the lifting and the lowering of the ladder stand are not limited, so that the taking is inconvenient.

In a first aspect, the invention provides an active ladder stand, comprising a first ladder stand section and a second ladder stand section, wherein the second ladder stand section is rotationally connected with the first ladder stand section through a rotating structure; the rotating structure comprises a first stop structure and a second stop structure which are arranged between the first ladder section and the second ladder section, the first stop structure and the second stop structure are suitable for limiting the rotating angle range of the second ladder section relative to the first ladder section, the first stop structure is used for limiting the second ladder section to be in a use state with a first included angle between the first ladder section, and the second stop structure is used for limiting the second ladder section to be in a storage state with the first ladder section being in a second included angle.

The beneficial effects are that: through setting up first ladder section, can be with the support or the walking board connection of activity cat ladder and engineering vehicle to fixed activity cat ladder. Through setting up the second and climb the bench, rotate between second and the first bench and be connected to be convenient for use and accomodate. Through setting up first backstop structure and second backstop structure, can restrict the rotation angle scope of second cat ladder section for first cat ladder section, when first backstop structure acts on, can be spacing at first contained angle with second cat ladder section and first cat ladder section, at this moment, the activity cat ladder is in the state of use, can be used to the climbing, when second backstop structure acts on, can be spacing at the second contained angle with second cat ladder section and first cat ladder section, at this moment, the activity cat ladder is in the state of accomodating, is convenient for accomodate. Through first backstop structure, play the spacing when the second climbs the bench and transfer, through second backstop structure, play the spacing when the second cat bench lifts to realize the two-way spacing of transferring of cat ladder, thereby can stably get and put and use the cat ladder, solved the inconvenient problem of activity cat ladder use.

In an alternative embodiment, the rotating structure comprises 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 is connected with the second connecting arm in a rotating way through a first rotating shaft; the first stop structure comprises 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 suitable for being mutually abutted.

The beneficial effects are that: the angle of the second climbing section is limited by adopting a mode that the first limiting surface and the second limiting surface are abutted, the structure is simple, the processing is convenient, and the limiting is reliable.

In an alternative embodiment, the first connecting arm comprises a first hinged plate and a first limiting plate which are connected with each other, the first limiting surface is arranged on the first limiting plate, and a third included angle is formed between the first limiting surface and a longitudinal beam of the first stair climbing section; the second connecting arm comprises a second hinge plate and a second limiting plate which are connected with each other, and the second hinge plate is rotationally connected with the first hinge plate; the second limiting surface is arranged on the second limiting plate, the second limiting surface and the longitudinal beam of the second climbing 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 degrees.

The beneficial effects are that: through setting up first articulated slab, first limiting plate, second articulated slab and second limiting plate, rotate first articulated slab and second articulated slab and connect, set up first backstop structure on first limiting plate and second limiting plate, each other do not influence, and the structure is more reasonable.

In an alternative embodiment, the second stop structure includes a third limiting surface disposed on the first connecting arm and a fourth limiting surface disposed on the second connecting arm, where the third limiting surface and the fourth limiting surface are adapted to abut against each other.

The beneficial effects are that: the lifting angle of the second climbing section is limited by adopting a mode that the third limiting surface and the fourth limiting surface are abutted, and the lifting mechanism is simple in structure, convenient to process and reliable in limiting.

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 hinge plate; and/or the third limiting surface is arranged on the first hinge plate, and the fourth limiting surface is arranged on the second limiting plate.

The beneficial effects are that: only one side is provided with a second stop structure, so that the limiting effect can be achieved, and the structure is simple. If the second stop structures are arranged on the two sides, the second stop structures on the two sides can share the stress, and the limiting effect is more reliable and stable.

In an alternative embodiment, the first hinge plate and the first limiting plate are arranged in an L-shaped structure, the second hinge 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 a relatively matched mode.

The beneficial effects are that: the first connecting arm and the second connecting arm form two second stop structures, and after the first connecting arm and the second connecting arm are matched and butted, the occupied space is small.

In an alternative embodiment, the first ladder stand section comprises two first longitudinal beams arranged side by side, the second ladder stand section comprises two second longitudinal beams arranged side by side, the first connecting arm and the first longitudinal beam are detachably connected, and the second connecting arm and the second longitudinal beam are detachably connected.

The beneficial effects are that: the first connecting arm and the first longitudinal beam are detachably connected, the second connecting arm and the second longitudinal beam are detachably connected, maintenance and replacement are facilitated, and maintenance cost is reduced.

In an alternative embodiment, the front end of the first ladder stand is provided with a mounting plate, the mounting plate is provided with mounting holes, and the first ladder stand is adapted to be connected with a landing or a support of the engineering vehicle via the mounting holes by means of fasteners.

The beneficial effects are that: through setting up the mounting panel and being located the mounting hole on the mounting panel, be convenient for connect first cat ladder section on engineering vehicle's walking board or support through the fastener to play the effect of fixed activity cat ladder.

In an alternative embodiment, be equipped with between first ladder section and the second ladder section and prevent shelling device, prevent shelling device includes spacing swing arm and spacing post, and the one end of spacing swing arm is rotated with first ladder section through the second pivot and is connected, and spacing post is fixed to be located the second and climbs the ladder section, and spacing swing arm is equipped with and spacing post complex spacing spout, and in spacing spout was located in the slip of spacing post, spacing spout was suitable for the second and climbs the ladder section locking in the state of use.

The beneficial effects are that: when the second ladder stand section is lowered to a use state, the limiting column located on the second ladder stand section is located in the limiting groove, and is limited by the abutting joint of the side wall of the limiting groove, so that the second ladder stand section is locked and cannot reversely rotate, and the problem that people are injured by the ladder stand in a rebound mode due to the fact that people step on the second ladder stand section is solved.

In an alternative embodiment, the limit chute comprises a first chute section and a second chute section which are communicated with each other, and the first chute section is matched with the limit column and used for limiting the second ladder section to rotate relative to the first ladder section; the second groove section is matched with the limit column, and the second ladder stand section is allowed to rotate relative to the first ladder stand section.

The beneficial effects are that: through setting up first slot section and second slot section, wherein, when spacing post slides to first slot section, spacing post and spacing groove's lateral wall butt can restrict second cat ladder section and upwards rotate; when the limiting column is separated from the first groove section and enters the second groove section, the limiting swing arm can swing along with the rotation of the second ladder climbing section, and the second ladder climbing section can be retracted.

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

The beneficial effects are that: the setting like this for when the second cat ladder section was transferred to the user state, spacing swing arm can not bulge second swing arm section in vertical, can play the effect of dodging, prevents to occupy unnecessary space or cause unexpected damage to personnel.

In a second aspect, the invention also provides an engineering vehicle, which comprises a vehicle body and the movable cat ladder in any one of the technical schemes, wherein the vehicle body is provided with a walking platform; the movable cat ladder is arranged on the walking platform.

The beneficial effects are that: because the engineering vehicle comprises the movable ladder, the engineering vehicle has the same effect as the movable ladder and is not described in detail herein.

In an alternative embodiment, the first climbing section of the movable ladder and the walking board are rotatably connected by a third rotation shaft, which is arranged perpendicularly to the longitudinal beam of the first climbing section.

The beneficial effects are that: by the arrangement, the convenience of using and storing two states of the movable ladder can be improved.

In an alternative embodiment, the walking board is provided with a locking device, and the movable ladder is suitable for rotating to the upper part of the walking board around the third rotating shaft and is in locking connection with the movable ladder through the locking device.

The beneficial effects are that: through setting up locking device, when the activity cat ladder is not used, can be with activity cat ladder locking connection on engineering vehicle's walking board, prevent that the activity cat ladder from taking place slip or jumping scheduling problem in the driving process, improve the security.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front view of an active ladder stand in a use state according to an embodiment of the present invention;

FIG. 2 is a side view of the mobile ramp shown in FIG. 1;

FIG. 3 is a schematic view of a partial enlarged structure at A in FIG. 2;

FIG. 4 is a perspective view of the rotating structure of FIG. 3;

FIG. 5 is a top view of the mobile ladder of FIG. 1;

FIG. 6 is a front view of the mobile ladder shown in FIG. 1 in a stowed condition;

FIG. 7 is a side view of the mobile ramp shown in FIG. 6;

FIG. 8 is a schematic view of a partial enlarged structure at B in FIG. 7;

FIG. 9 is a top view of the mobile ladder of FIG. 6;

FIG. 10 is a side view of a mobile ramp incorporating a anti-bounce device in use;

FIG. 11 is a schematic view of a partially enlarged structure at C in FIG. 10;

FIG. 12 is a side view of the mobile ramp of FIG. 10 in a stowed condition;

FIG. 13 is a schematic view of a partially enlarged structure at D in FIG. 12;

FIG. 14 is a side view of the mobile ladder connected to the deck in use;

fig. 15 is a front view of the device shown in fig. 14;

FIG. 16 is a top view of FIG. 15;

FIG. 17 is an isometric view of the mobile ladder connected to the deck in a stowed position;

FIG. 18 is an isometric view of the mobile ramp after a locked connection with the landing;

fig. 19 is a partially enlarged schematic view of the structure at E in fig. 18.

Reference numerals illustrate:

1. a first climbing section; 11. a first stringer; 12. a mounting plate; 13. a mounting hole; 14. a third rotating shaft; 15. a pedal; 16. grabbing and holding the handrail; 2. a second climbing section; 21. a second stringer; 3. a rotating structure; 31. a first stop structure; 311. a first limiting surface; 312. the second limiting surface; 32. a second stop structure; 321. a third limiting surface; 322. a fourth limiting surface; 33. a first connecting arm; 331. a first hinge plate; 332. a first limiting plate; 34. a second connecting arm; 341. a second hinge plate; 342. a second limiting plate; 35. a first rotating shaft; 4. a device for preventing the jump; 41. limiting swing arms; 42. a limit column; 411. limiting sliding grooves; 4111. a first trough section; 4112. a second trough section; 43. a second rotating shaft; 5. a walking platform; 6. a locking device; 61. a mounting groove; 62. a pin; 7. a first elastic cushion block; 8. a second elastic cushion block; 9. a third elastic cushion block; 10. and (3) a movable cat ladder.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

An embodiment of the present invention is described below with reference to fig. 1 to 19.

According to an embodiment of the present invention, in one aspect, there is provided an active ladder 10, as shown in fig. 2, including a first ladder section 1, a second ladder section 2, and a rotating structure 3, the second ladder section 2 being rotatably connected to the first ladder section 1 through the rotating structure 3; the rotating structure 3 comprises a first stop structure 31 and a second stop structure 32 which are arranged between the first climbing section 1 and the second climbing section 2, the first stop structure 31 and the second stop structure 32 are suitable for limiting the rotating angle range of the second climbing section 2 relative to the first climbing section 1, the first stop structure 31 is used for limiting the second climbing section 2 in the rotating angle range and is in a use state of a first included angle alpha between the first climbing section 1, and the second stop structure 32 is used for limiting the second climbing section 2 in the rotating angle range and is in a storage state of a second included angle beta with the first climbing section 1.

By providing the first climbing section 1, the movable cat ladder 10 can be connected with the support or the traveling platform 5 of the engineering vehicle to fix the movable cat ladder 10. Through setting up second stair climbing section 2, rotate between second stair climbing section 2 and the first stair climbing section 1 and connect to be convenient for use and accomodate. Through setting up first backstop structure 31 and second backstop structure 32, can restrict second and climb bench 2 for the rotation angle scope of first bench 1, when first backstop structure 31 acts on, can be with second bench 2 and first bench 1 spacing at first contained angle alpha, at this moment, activity cat ladder 10 is in the user state as shown in fig. 2, can be used to the climbing, when second backstop structure 32 acts on, can be with second bench 2 and first bench 1 spacing at second contained angle beta, at this moment, activity cat ladder 10 is in the storage state as shown in fig. 7 or fig. 9, the storage of being convenient for. Through first backstop structure 31, play the spacing when second stair climbing section 2 descends, through second backstop structure 32, play spacing when second stair climbing section 2 lifts up to realize the two-way spacing of the lowering of cat ladder, lift up, thereby can stably get and put and use the cat ladder.

In one embodiment, as shown in fig. 4, 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 stair section 1, the second connecting arm 34 is connected to the second stair section 2, and the first connecting arm 33 and the second connecting arm 34 are rotatably connected by a first rotating shaft 35.

Through setting up first linking arm 33 and second linking arm 34, be connected with first stair climbing section 1, second stair climbing section 2 respectively, set up first backstop structure 31 and second backstop structure 32 on first linking arm 33 and second linking arm 34, compare with first backstop structure 31 and second backstop structure 32 direct setting on first stair climbing section 1, second stair climbing section 2, processing is more convenient.

In one embodiment, as shown in fig. 8, the first stop structure 31 includes a first stop surface 311 provided on the first connecting arm 33 and a second stop surface 312 provided on the second connecting arm 34, where the first stop surface 311 and the second stop surface 312 are adapted to abut against each other.

The first connecting arm 33 is provided with the first limiting surface 311, the second connecting arm 34 is provided with the second limiting surface 312, 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 are in mutual abutting joint, the second ladder section 2 is lowered into place, at this time, the second ladder section 2 is in a use state as shown in fig. 2, and a first included angle alpha is formed between the second ladder section 2 and the first ladder section 1. The first limiting surface 311 and the second limiting surface 312 are abutted to limit the downward angle of the second climbing section 2, so that the device is simple in structure, convenient to process and reliable in limiting.

In one embodiment, as shown in fig. 4 and 8, the first connecting arm 33 includes a first hinge plate 331 and a first stopper plate 332 that are connected to each other. The 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 section 1 form a third included angle gamma. The second connecting arm 34 includes a second hinge plate 341 and a second limiting plate 342 connected to each other, and the second hinge plate 341 is rotatably connected to the first hinge plate 331; 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 section 2 form a fourth included angle θ, and the sum of the first included angle α, the third included angle γ and the fourth included angle θ is 360 °.

Specifically, the magnitude of the first included angle α reflects the preset lowering degree of the second stair climbing section 2, that is, the larger the first included angle α is set, the smaller the inclination angle of the second stair climbing section 2 relative to the ground is, and the more gentle is the second stair climbing section 2; the smaller the first angle α is set, the larger the inclination angle of the second climbing section 2 with respect to the ground is, the steeper. The magnitude of the first angle α depends on the sum of the third angle γ and the fourth angle θ. The smaller the sum of the angles of the third angle γ and the fourth angle θ, the larger the first angle α, and conversely, the smaller the first angle α. The third angle γ and the fourth angle θ may be the same or different.

Through setting up first articulated slab 331, first limiting plate 332, second articulated slab 341 and second limiting plate 342, rotate first articulated slab 331 and second articulated slab 341 and connect, set up first backstop structure 31 on first limiting plate 332 and second limiting plate 342, do not influence each other, the structure is more reasonable. Specifically, when the first included angle α is too large, the movable ladder stand 10 occupies a larger space when in use; the first included angle α is too small, so that the second climbing section 2 is too steep and is unfavorable for climbing, and therefore, the first included angle α can be controlled within a reasonable range, for example, the first included angle α is within a range of 90 ° to 145 ° through controlling the third included angle γ and the fourth included angle θ.

In one embodiment, the third included angle γ and the fourth included angle θ are equal, and are controlled to be between 45 ° and 72.5 °. The specific angle is determined according to whether the second climbing section 2 is provided with an obstacle and the bearing weight below the second climbing section.

In one embodiment, the first angle is 106 degrees, which ensures that the angle is limited when the movable ladder 10 is in use, and is convenient to take and place.

In one embodiment, as shown in fig. 3, the second stopping structure 32 includes a third limiting surface 321 provided on the first connecting arm 33 and a fourth limiting surface 322 provided on the second connecting arm 34, where the third limiting surface 321 and the fourth limiting surface 322 are adapted to abut against each other.

The first connecting arm 33 is provided with the third limiting surface 321, the second connecting arm 34 is provided with the fourth limiting surface 322, when the movable ladder stand 10 is required to be folded after being used, the second ladder stand 2 is lifted, the second ladder stand 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 are mutually abutted, the second ladder stand 2 is lifted in place, at this time, the second ladder stand 2 is in a storage state as shown in fig. 7, and a second included angle beta is formed between the second ladder stand 2 and the first ladder stand 1. The lifting angle of the second climbing section 2 is limited by adopting a mode that the third limiting surface 321 and the fourth limiting surface 322 are abutted, and the device is simple in structure, convenient to process and reliable in limiting.

Specifically, in one embodiment, when the third limiting surface 321 and the fourth limiting surface 322 abut against each other, the second climbing section 2 and the first climbing section 1 are parallel, that is, the second included angle β between the second climbing section 2 and the first climbing section 1 is 180 °. In prior art, lift up the cat ladder and do not have spacingly, when wholly lifting up the cat ladder, the revolution mechanic between second cat ladder section and the first cat ladder section has the degree of freedom of rotation, is difficult to control, and the mode that adopts third spacing face 321 and fourth spacing face 322 looks butt of this embodiment to restrict the angle that second cat ladder section 2 lifted up, makes personnel wholly lift up the cat ladder and rotate on the horizontal plane easily.

In one embodiment, as shown in fig. 4, the third limiting surface 321 is disposed on the first limiting plate 332, and the fourth limiting surface 322 is disposed on the second hinge plate 341; and/or, the third limiting surface 321 is disposed on the first hinge plate 331, and the fourth limiting surface 322 is disposed on the second limiting plate 342.

That is, one second stopper structure may be provided on either side of the first hinge plate 331 and the second hinge plate 341, or a second stopper structure may be provided on both sides of the first hinge plate 331 and the second hinge plate 341. Only one side is provided with a second stop structure, so that the limiting effect can be achieved, and the structure is simple. If the second stop structures are arranged on the two sides, the second stop structures on the two sides can share the stress, and the limiting effect is more reliable and stable.

In one embodiment, the first hinge plate 331 and the first limiting plate 332 are disposed in an L-shaped configuration, the second hinge plate 341 and the second limiting plate 342 are disposed in an L-shaped configuration, and the first connecting arm 33 and the second connecting arm 34 are connected in an opposing mating manner.

Specifically, the first hinge plate 331 and the second hinge plate 341 are rotatably connected through the first shaft 35, the first limiting plate 332 and the second limiting plate 342 are respectively located at two end sides of the first 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 matched and butted, the occupied space is small.

In one embodiment, the first connecting arm 33 is identical in structure to the second connecting arm 34.

In one embodiment, to implement the second stopping structure without affecting the relative rotation between the first hinge plate 331 and the second hinge plate 341, the first hinge plate 331 is a plate-shaped body with a substantially fan-shaped cross section, a side of the first hinge plate 331 facing the fourth limiting surface 322 is configured as an arc shape, while the second hinge plate 341 is a plate-shaped body with a substantially fan-shaped cross section, and a side of the second hinge plate 341 facing the fourth limiting surface 322 is configured as an arc shape.

In one embodiment, the first and second connecting arms 33, 34 are integrally cast from steel. In this way, the first connecting arm 33 and the second connecting arm 34 can be ensured to have stronger rigidity, the stress requirement generated when a heavy person steps on the ladder can be met, the problems of fracture and the like are avoided, and the overall reliability of the movable ladder 10 is improved.

In one embodiment, as shown in fig. 1, the first climbing section 1 includes two first stringers 11 arranged side by side, the second climbing section 2 includes two second stringers 21 arranged side by side, the first connecting arm 33 is detachably connected to the first stringers 11, and the second connecting arm 34 is detachably connected to the second stringers 21.

Specifically, as shown in fig. 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 the connecting holes by bolts, and the second connecting arm 34 and the second longitudinal beam 21 are connected by bolts, so that the detachable structure is realized.

Because the rotating connection structure is a member for carrying larger stress of the movable ladder 10 in the use process, the maintenance frequency of the rotating connection structure is higher, the first connecting arm 33 and the first longitudinal beam 11 are detachably connected, the second connecting arm 34 and the second longitudinal beam 21 are detachably connected, the maintenance and the replacement are convenient, and the maintenance cost is reduced. Compared with the scheme that the first connecting arm 33 is fixedly connected with the first longitudinal beam 11 and the second connecting arm 34 is fixedly connected with the second longitudinal beam 21, when the rotating structure 3 is damaged, the first climbing section 1 or the second climbing section 2 does not need to be integrally replaced, and the maintenance cost is reduced.

In one embodiment, as shown in fig. 5, the front end of the first climbing section 1 is provided with a mounting plate 12, the mounting plate 12 is provided with mounting holes 13, and the first climbing section 1 is adapted to be connected with the deck 5 or the support of the construction vehicle by means of fasteners via the mounting holes 13. Through setting up mounting panel 12 and being located mounting hole 13 on mounting panel 12, be convenient for connect first climbing section 1 on engineering vehicle's walking board 5 or support through the fastener to play the effect of fixed movable cat ladder 10.

In one embodiment, as shown in fig. 10 and 12, a bulletproof device 4 is arranged between the first climbing section 1 and the second climbing section 2, the bulletproof device 4 comprises a limiting swing arm 41 and a limiting post 42, one end of the limiting swing arm 41 is rotationally connected with the first climbing section 1 through a second rotating shaft 43, the limiting post 42 is fixedly arranged on the second climbing section 2, the limiting swing arm 41 is provided with a limiting sliding groove 411 matched with the limiting post 42, the limiting post 42 is slidably arranged in the limiting sliding groove 411, and the limiting sliding groove 411 is suitable for locking the second climbing section 2 in a use state as shown in fig. 2.

Since the user can step on the free foot during the use of the movable ladder stand 10, the foot force can cause the second ladder section 2 to rebound to hurt the user, and therefore, the anti-bouncing device 4 is provided. When the second stair climbing section 2 is lowered to the use state shown in fig. 2, the limiting column 42 located on the second stair climbing section 2 is located in the limiting groove, and is limited by the abutting joint of the side wall of the limiting groove, so that the second stair climbing section 2 is locked and cannot rotate reversely, and the problem that people are injured by the reverse bounce of the stair climbing caused by the fact that people step on the stair is solved. When the second climbing section 2 is required to be lifted and retracted, the limiting connection between the limiting post 42 and the limiting groove can be released, and the shape of the limiting groove can be set, so that the limiting post 42 slides to a position where the second climbing section 2 is not limited in rotation.

In one embodiment, as shown in fig. 11, the limit chute 411 includes a first slot segment 4111 and a second slot segment 4112 that are in communication with each other, the first slot segment 4111 cooperating with the limit post 42 for limiting rotation of the second climbing section 2 relative to the first climbing section 1; the second slot segment 4112 mates with the limit post 42 allowing the second stair run 2 to rotate relative to the first stair run 1.

By providing the first slot segment 4111 and the second slot segment 4112, wherein when the limit post 42 slides into the first slot segment 4111, the limit post 42 abuts against the side wall of the limit slot, as shown in fig. 11, the second stair climbing segment 2 can be limited from rotating upwards; when the limit post 42 is separated from the first slot segment 4111 and enters the second slot segment 4112, as shown in fig. 13, the limit swing arm 41 can swing along with the rotation of the second stair climbing segment 2, and the second stair climbing segment 2 can be retracted.

In one embodiment, the limiting swing arm 41 is a bent structure, and when the second stair climbing section 2 is in the use state as shown in fig. 2, the limiting swing arm 41 overlaps with the longitudinal beam of the second stair climbing section 2.

The arrangement is such that when the second stair climbing section 2 is lowered to the use state shown in fig. 2, the limiting swing arm 41 does not protrude out of the second swing arm section in the vertical direction, so that the avoidance effect can be achieved, and the occupation of redundant space or accidental injury to personnel can be prevented.

In one embodiment, as shown in fig. 7, the bottom of the first climbing section 1 is provided with a first resilient pad 7.

Since the first climbing section 1 needs to be connected to the traveling platform 5 or the support of the engineering vehicle, as shown in fig. 14, the traveling platform 5 or the support of the engineering vehicle can be prevented from being scratched by providing the first cushion pad at the bottom of the first climbing section 1.

In one embodiment, as shown in fig. 7, a second resilient pad 8 is attached to the lower surface of the second climbing section 2.

Because the movable ladder stand 10 can rotate the second ladder stand section 2 to be flush with the first ladder stand section 1 when not in use, and then is integrally placed on the traveling platform 5 or the bracket of the engineering vehicle. The second elastic cushion 8 is arranged, so that the second elastic cushion 8 is in direct contact with the walking board 5 or the support of the engineering vehicle to play a role in isolation and buffering, on one hand, the movable ladder stand 10 can be prevented from scratching the walking board 5 or the support of the engineering vehicle, and on the other hand, abnormal sound caused by vibration during running can be avoided.

In one embodiment, as shown in fig. 5 and 6, the first climbing section 1 has a grab rail 16 attached,

by the arrangement, workers can conveniently grasp the grab rail 16 in the climbing or descending process, and safety performance is improved.

In one embodiment, the first stringer 11 of the first stair run 1 and the second stringer 21 of the second stair run 2 are both high-strength, lightweight aluminum profiles. In a specific embodiment, the section of the aluminum profile is rectangular and the specification is 25mm x 62mm, and the stress pattern of the first longitudinal beam 11 and the second longitudinal beam 21 can be optimized compared to a square section profile.

The movable ladder 10 is ensured to have use strength, the weight of the movable ladder 10 is reduced, and the workload of operators for using and storing the movable ladder 10 is reduced.

The movable ladder 10 that this embodiment provided, except being located the handrail 16 of grabbing of first ladder section 1, first longeron 11 and second longeron 21 are the section bar structure, and when second ladder section 2 put and accomodate, the vertical space that occupies is little, can satisfy the vertical demand of putting in different positions.

In one embodiment, the second stair climbing section 2 further comprises a plurality of cross beams which are connected between the two second longitudinal beams 21 at intervals, and the upper surfaces of the cross beams are provided with anti-skid patterns.

By this arrangement, slipping is prevented when the user steps on, and the safety performance of the movable ladder 10 is improved when the user uses the movable ladder.

In one embodiment, as shown in fig. 5, the first climbing section 1 further comprises a tread 15 connected between the two first stringers 11, the upper surface of the tread 15 being provided with anti-skid threads.

The arrangement plays a role of skid resistance, and further improves the safety performance of the movable ladder 10 in use.

According to an embodiment of the present invention, on the other hand, there is also provided an engineering vehicle, including a vehicle body and the movable ladder stand 10 according to any one of the above technical solutions, the vehicle body being provided with a walking stand 5; the movable ladder stand 10 is provided on the walking board 5.

Because the construction vehicle includes the movable ladder 10, it has the same effect as the movable ladder 10, and will not be described again.

In one embodiment, the mounting plate 12 of the first step section 1 of the mobile ladder 10 and the ramp 5 are rotatably connected by a third rotation axis 14.

The first climbing bench 1 and the walking platform 5 are rotationally connected through the third rotating shaft 14, so that the first climbing bench 1 can rotate relative to the walking platform 5, and accordingly, when the movable ladder 10 is used, the movable ladder 10 integrally rotates around the third rotating shaft 14, the second climbing bench 2 rotates to leave the walking platform 5, and the movable ladder can be used in a descending mode. After the movable ladder stand 10 is used, the second ladder stand section 2 is lifted, and then the movable ladder stand 10 is rotated around the third rotating shaft 14, so that the movable ladder stand 10 is rotated above the walking board 5, and the movable ladder stand 10 is conveniently stored on the walking board 5. By this arrangement, the convenience of using and storing the movable ladder 10 for two-state conversion can be improved.

Further, as shown in fig. 16 and 17, in one embodiment, the third shaft 14 is a bolt. On the one hand, the function of the rotating shaft can be achieved, on the other hand, the movable cat ladder 10 and the walking board 5 are detachably connected through bolts, and maintenance and replacement are convenient.

In one embodiment, as shown in fig. 15 to 19, the walking board 5 is provided with a locking device 6, and the movable ladder 10 is adapted to rotate around the third rotation shaft 14 to above the walking board 5, and is locked and connected with the movable ladder 10 by the locking device 6.

When the movable ladder 10 is not in use, the movable ladder 10 is rotated about the third rotation shaft 14 from the state shown in fig. 17 to the state shown in fig. 18. By providing the locking device 6, the movable ladder 10 can be locked and connected to the traveling platform 5 of the engineering vehicle, as shown in fig. 18, so that the movable ladder 10 is prevented from sliding or jumping during traveling, and the safety is improved.

In one embodiment, as shown in fig. 19, the locking device 6 includes a mounting groove 61, where the mounting groove 61 cooperates with the second longitudinal beam 21 of the second ladder section 2, and when the movable ladder 10 is stored and laid, the second longitudinal beam 21 is placed in the mounting groove 61, and the mounting groove 61 can prevent the movable ladder 10 from swinging in a horizontal plane.

Further, in one embodiment, pin holes are provided in the opposite walls of the mounting groove 61, and when the second side member 21 is placed in the mounting groove 61, the pins 62 are inserted into the pin holes, and the pins 62 are located above the second side member 21, so that the movable ladder 10 can be prevented from swinging up and down.

Further, in one embodiment, pin 62 is a slip-off prevention pin.

Specifically, the anti-drop pin comprises a connecting section and an anti-drop section, and one ends of the connecting section and the anti-drop section are elastically connected. The connecting section is used for being inserted into the pin hole of the mounting groove 61 to prevent the movable ladder stand 10 from shaking up and down. The anti-falling section automatically fits the connecting section under the elastic action, so that the anti-falling pin 62 forms a closed structure and is sleeved on the mounting groove 61, thereby playing an anti-falling role and playing a reliable limiting role on the movable ladder 10.

Of course, other structures can be further arranged to limit the up-and-down shaking of the second longitudinal beam 21, for example, an elastic buckle is arranged on the inner wall of the mounting groove 61, the second longitudinal beam 21 is pressed down, the second longitudinal beam 21 is directly pressed into the mounting groove 61, the elastic buckle automatically resets to shield the second longitudinal beam 21, and the limiting effect is achieved on the second longitudinal beam 21 along the vertical direction.

In one embodiment, the deck 5 is provided with a third resilient pad 9 near the edge.

Thus, when the movable ladder stand 10 is used, the first ladder section 1 is connected to the walking board 5, and the first longitudinal beam 11 of the first ladder section 1 is pressed on the third elastic cushion block 9, so that the movable ladder stand 10 is prevented from scratching the walking board 5.

Further, in one embodiment, the upper surface of the third resilient pad 9 is provided with a recess cooperating with the first longitudinal beam 11.

Like this set up, when using movable cat ladder 10, first longeron 11 of first cat bench 1 is located the recess of third elastic cushion, and the recess plays spacing effect to first longeron 11, prevents that movable cat ladder 10 from taking place along the swing of horizontal direction, security when improving the operation personnel cat ladder. Meanwhile, the third elastic cushion 9 can also play a role in shock absorption in the process of climbing stairs by operators.

Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims (13)

1. An active ladder stand, comprising:

a first climbing section (1);

the second climbing section (2) is rotationally connected with the first climbing section (1) through a rotating structure (3);

the rotating structure (3) comprises a first stop structure (31) and a second stop structure (32) which are arranged between the first climbing section (1) and the second climbing section (2), the first stop structure (31) and the second stop structure (32) are suitable for limiting the rotating angle range of the second climbing section (2) relative to the first climbing section (1), the first stop structure (31) is used for limiting the second climbing section (2) to be in a use state with a first included angle between the first climbing section (1), and the second stop structure (32) is used for limiting the second climbing section (2) to be in a storage state with the first climbing section (1) to be in a second included angle.

2. The mobile ladder of claim 1, wherein the swivel arrangement (3) comprises a first connecting arm (33) and a second connecting arm (34), the first connecting arm (33) being connected to the first ladder section (1), the second connecting arm (34) being connected to the second ladder section (2), the first connecting arm (33) and the second connecting arm (34) being swivel-connected by a first swivel (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 suitable for being mutually abutted.

3. The movable ladder stand according to claim 2, characterized in that the first connecting arm (33) comprises a first hinged plate (331) and a first limiting plate (332) which are connected with each other, the first limiting surface (311) is arranged on the first limiting plate (332), and the first limiting surface (311) and a longitudinal beam of the first ladder section (1) form a third included angle;

the second connecting arm (34) comprises a second hinge plate (341) and a second limiting plate (342) which are connected with each other, and the second hinge plate (341) is rotatably connected with the first hinge plate (331); the second limiting surface (312) is arranged on the second limiting plate (342), the second limiting surface (312) and a longitudinal beam of the second climbing 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 degrees.

4. A mobile ladder according to claim 3, characterized in that the second stop structure (32) comprises a third stop surface (321) provided on the first connecting arm (33) and a fourth stop surface (322) provided on the second connecting arm (34), the third stop surface (321) and the fourth stop surface (322) being adapted to abut each other.

5. The mobile ladder of claim 4, wherein the third limiting surface (321) is provided on the first limiting plate (332), and the fourth limiting surface (322) is provided on the second hinge plate (341); and/or, the third limiting surface (321) is arranged on the first hinge plate (331), and the fourth limiting surface (322) is arranged on the second limiting plate (342).

6. A mobile ladder according to claim 3, characterized in that said first hinge plate (331) and said first limiting plate (332) are arranged in an L-shaped configuration, said second hinge plate (341) and said second limiting plate (342) are arranged in an L-shaped configuration, and said first connecting arm (33) and said second connecting arm (34) are connected in a counter-fit.

7. The mobile ladder of claim 2, wherein the first ladder section (1) comprises two first stringers (11) arranged side by side, the second ladder section (2) comprises two second stringers (21) arranged side by side, the first connecting arm (33) and the first stringers (11) are detachably connected, and the second connecting arm (34) and the second stringers (21) are detachably connected.

8. The mobile ladder stand according to claim 1 or 2, characterized in that 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 a platform (5) or a support of an engineering vehicle by means of fasteners via the mounting hole (13).

9. The movable ladder stand according to claim 1 or 2, characterized in that a bulletproof device (4) is arranged between the first climbing section (1) and the second climbing section (2), the bulletproof device (4) comprises a limit swing arm (41) and a limit column (42), one end of the limit swing arm (41) is rotationally connected with the first climbing section (1) through a second rotating shaft (43), the limit column (42) is fixedly arranged on the second climbing section (2), the limit swing arm (41) is provided with a limit chute (411) matched with the limit column (42), the limit column (42) is slidingly arranged in the limit chute (411), and the limit chute (411) is suitable for locking the second climbing section (2) in the use state.

10. The mobile ramp according to claim 9, wherein the limit chute (411) comprises a first slot section (4111) and a second slot section (4112) in communication with each other, the first slot section (4111) cooperating with the limit post (42) for limiting the rotation of the second ramp section (2) relative to the first ramp section (1); the second groove section (4112) is matched with the limit post (42) to allow the second climbing section (2) to rotate relative to the first climbing section (1).

11. The mobile ladder of claim 10, wherein the limit swing arm (41) is of a bent structure, and the limit swing arm (41) overlaps with the longitudinal beam of the second ladder section (2) when the second ladder section (2) is in the use state.

12. An engineering vehicle, comprising:

the vehicle body is provided with a walking board (5);

the mobile ramp (10) of any one of claims 1 to 11, said mobile ramp (10) being provided to said landing (5).

13. The working vehicle according to claim 12, characterized in that the first climbing section (1) of the mobile ladder (10) and the landing (5) are rotatably connected by means of a third rotation shaft (14).