Embarking ladder, construction vehicle

Abstract

The present invention relates to the technical field of construction machinery, and particularly relates to an access ladder and an engineering vehicle. The access ladder includes: a first ladder component, the first end of which is adapted to be hinged to the vehicle body; a second ladder component, which is hinged to the second end of the first ladder component; a driving component, which is used to drive the first ladder component to rotate relative to the vehicle body, so that the first ladder component has a retracted position and an extended position with a first preset angle with respect to the horizontal plane; a transmission structure, which is connected between the first ladder component and the second ladder component. When the driving component drives the first ladder component to rotate, the transmission structure drives the second ladder component to move, so that when the first ladder component is in the retracted position, the second ladder component is folded with the first ladder component; when the first ladder component is in the extended position, the second ladder component is in an open position with an angle of a second preset angle with respect to the horizontal plane. Only by setting one driving component can the first ladder component and the second ladder component be driven to fold and rotate, and the structure is simple and compact.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and particularly relates to an access ladder and an engineering vehicle. Background Art

[0002] At present, large excavators are widely used in mines. Due to their large size and complex road conditions, high requirements are imposed on the boarding device. In use, it is found that the walking platform of the excavator is more than two meters high from the ground, making it inconvenient to get on and off the vehicle. Some existing access ladders can be retracted relative to the vehicle body, but the height of the access ladder in the retracted state is relatively large, so the overall center of gravity is relatively high and the stability is poor. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the center of gravity of the existing access ladder is relatively high in the retracted state, so as to provide an access ladder and an engineering vehicle that can reduce the center of gravity in the retracted state.

[0004] To solve the above technical problem, an access ladder provided by the present invention includes:

[0005] A first ladder component, the first end of which is adapted to be hinged to the vehicle body;

[0006] A second ladder component, hinged to the second end of the first ladder component;

[0007] A driving component, connected to one end of the first ladder component close to the second ladder component, for driving the first ladder component to rotate relative to the vehicle body, so that the first ladder component has a retracted position and a deployed position with a first preset angle with the horizontal plane;

[0008] A transmission structure, connected between the first ladder component and the second ladder component. When the driving component drives the first ladder component to rotate, the transmission structure drives the second ladder component to move, so that when the first ladder component is in the retracted position, the second ladder component is folded with the first ladder component; when the first ladder component is in the deployed position, the second ladder component is in an open position with an angle of a second preset angle with the horizontal plane.

[0009] Optionally, when the first ladder component is in the retracted position, the first ladder component is in a vertical state or close to a vertical state.

[0010] Optionally, the transmission structure includes:

[0011] A connecting piece, one end of which is hinged to the first ladder component;

[0012] An adjustable connecting rod, the length of which can be adjusted, a first end of the adjustable connecting rod is hinged to the other end of the connecting member, and a second end of the adjustable connecting rod is hinged to the second ladder assembly.

[0013] Optionally, the driving assembly comprises:

[0014] A power cylinder, the bottom of which is suitable for being hinged to the vehicle body;

[0015] A push rod structure is telescopically arranged in the power cylinder, and an end of the push rod structure is hinged to the first ladder component.

[0016] Optionally, the boarding ladder further includes a first hinge seat, which is suitable for being fixedly connected to the vehicle body, and the bottom of the power cylinder is hinged to the first hinge seat.

[0017] Optionally, the first preset angle is equal to the second preset angle, and when the first ladder assembly is located at the deployed position, the first ladder assembly is coplanar with the second ladder assembly.

[0018] Optionally, the boarding ladder further comprises:

[0019] The handrail structure is arranged at least on one side of the first ladder assembly and / or the second ladder assembly.

[0020] Optionally, the handrail structure is movably connected to the first ladder assembly and / or the second ladder assembly, and when the driving assembly drives the first ladder assembly to rotate, the handrail structure is folded or unfolded in conjunction with the first ladder assembly and / or the second ladder assembly.

[0021] Optionally, the handrail structure comprises:

[0022] An upper armrest, one end of which is adapted to be hinged to the vehicle body;

[0023] A lower handrail has one end hinged to the other end of the upper handrail and one end hinged to the first ladder assembly. The upper handrail, the lower handrail, the first ladder assembly and the vehicle body form a four-bar linkage.

[0024] Optionally, the lower armrest includes a second main body portion, the second main body portion is provided with a first connecting portion, the first connecting portion is hinged to the other end of the upper armrest, and the first connecting portion is detachably connected to the second main body portion.

[0025] Optionally, a first fixing ring is provided at a position of the lower handrail facing the first ladder assembly and hinged to the first ladder assembly.

[0026] Optionally, the boarding ladder further includes a second hinge seat, which is adapted to be fixedly connected to the vehicle body. The upper handrail and the first ladder assembly are respectively hinged to the second hinge seat, and the upper handrail, the lower handrail, and the first ladder assembly and the second hinge seat form a four-bar linkage mechanism.

[0027] Optionally, the transmission structure includes the lower handrail and an adjustable connecting rod hinged between the lower handrail and the second ladder assembly, and the length of the adjustable connecting rod is adjustable.

[0028] The present invention also provides an engineering vehicle, including a vehicle body and the boarding ladder connected to the vehicle body.

[0029] The technical solution of the present invention has the following advantages:

[0030] 1. For the boarding ladder provided by the present invention, when the boarding ladder needs to be used to board the vehicle, the driving assembly drives the first ladder assembly to rotate from the retracted position to the deployed position, and the second ladder assembly rotates to the open position under the drive of the transmission structure. The transmission structure keeps the second ladder assembly in the open position, enabling users to safely board the vehicle along the boarding ladder; when the boarding ladder is not in use, the driving assembly drives the first ladder assembly to rotate from the deployed position to the retracted position in a vertical state or close to a vertical state. Driven by the transmission structure, the second ladder assembly rotates with the first ladder assembly and folds on the first ladder assembly. Only by setting one driving assembly can the first ladder assembly and the second ladder assembly be driven to fold and rotate. The structure is simple and compact, and in the folded state, the overall height of the boarding ladder is relatively low, reducing the center of gravity of the boarding ladder and having better stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of the boarding ladder provided in Embodiment 1 of the present invention;

[0033] Figure 2 For Figure 1 a schematic structural diagram of the driving device of the boarding ladder shown;

[0034] Figure 3 For Figure 1 a schematic structural diagram of the lower handrail at an angle shown;

[0035] Figure 4 For Figure 1Schematic structural diagram of the lower armrest shown from another angle;

[0036] Figure 5 is Figure 1 Schematic structural diagram of the first ladder component shown;

[0037] Figure 6 is Figure 5 Partial enlarged view of;

[0038] Figure 7 is Figure 1 Schematic structural diagram of the second ladder component shown;

[0039] Figure 8 Schematic structural diagram of the boarding ladder when the first ladder component is in the retracted position;

[0040] Figure 9 Schematic structural diagram of the boarding ladder when the first ladder component is in the deployed position.

[0041] Explanation of reference numerals:

[0042] 1 - First ladder component; 101 - Main support earring; 102 - Main support rod; 103 - Guard plate; 104 - Pedal structure; 105 - First hinge fixing ring; 106 - First folding hinge ring plate;

[0043] 2 - Second ladder component; 201 - Second folding hinge ring plate; 202 - Second hinge fixing ring;

[0044] 3 - First hinge rod; 4 - Second hinge rod;

[0045] 5 - Driving component; 501 - Power cylinder; 502 - First push rod; 503 - Second push rod; 504 - Mounting part;

[0046] 6 - First hinge seat;

[0047] 7 - Upper armrest; 701 - First main body part; 702 - First articulated part; 703 - Second articulated part;

[0048] 8 - Lower armrest; 801 - Second main body part; 802 - First connecting part; 803 - Second connecting part; 804 - Third connecting part; 805 - Threaded seat; 806 - First fixing ring; 807 - Second fixing ring; 8071 - Fixing hole;

[0049] 9 - Third hinge rod; 10 - Fourth hinge rod; 11 - Fifth hinge rod; 12 - Adjustable connecting rod; 13 - Sixth hinge rod; 14 - Seventh hinge rod; 15 - Second hinge seat; 16 - Bolt; 17 - Nut; 18 - Washer. Detailed implementation manners

[0050] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0051] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0053] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] Embodiment 1

[0055] This embodiment provides a boarding ladder. In one embodiment, as Figures 1 to 9 shown, the boarding ladder includes a first ladder assembly 1, a second ladder assembly 2, a drive assembly 5, and a transmission structure.

[0056] Among them, the first end of the first ladder assembly 1 is adapted to be hinged to the vehicle body. Specifically, the first end of the first ladder assembly 1 is hinged to the vehicle body through a first hinge rod 3; the second ladder assembly 2 is hinged to the second end of the first ladder assembly 1. Specifically, the second ladder assembly 2 is hinged to the second end of the first ladder assembly 1 through a second hinge rod 4; the drive assembly 5 is connected to one end of the first ladder assembly 1 close to the second ladder assembly 2 and is used to drive the first ladder assembly 1 to rotate relative to the vehicle body, so that the first ladder assembly 1 has a retracted position and a deployed position with a first preset angle with respect to the horizontal plane. The first preset angle can be 45° ± 5°; as Figure 8As shown, the transmission structure is connected between the first ladder component 1 and the second ladder component 2. When the driving component 5 drives the first ladder component 1 to rotate, the transmission structure drives the second ladder component to move, so that when the first ladder component 1 is in the retracted position, the second ladder component 2 is folded with the first ladder component 1; as Figure 9 shown, when the first ladder component 1 is in the deployed position, the second ladder component 2 is in the open position with an angle of a second preset angle with the horizontal plane, and the second preset angle can also be 45° ± 5°.

[0057] For the boarding ladder provided in this embodiment, when the boarding ladder needs to be used to board the vehicle, the driving component 5 drives the first ladder component 1 to rotate from the retracted position to the deployed position, and the second ladder component 2 rotates to the open position under the drive of the transmission structure. The transmission structure keeps the second ladder component 2 in the open position, enabling users to board the vehicle safely along the boarding ladder; when the boarding ladder is not in use, the driving component 5 drives the first ladder component 1 to rotate from the deployed position to the retracted position. Driven by the transmission structure, the second ladder component 2 rotates with the first ladder component 1 and folds on the first ladder component 1. Only by setting one driving component can the first ladder component 1 and the second ladder component 2 be driven to fold and rotate. The structure is simple and compact, and in the folded state, the overall height of the boarding ladder is relatively low, reducing the center of gravity of the boarding ladder and having better stability.

[0058] In a preferred embodiment, when the first ladder component 1 is in the retracted position, the first ladder component 1 is in a vertical state or close to a vertical state. In this embodiment, in the folded state, the overall height of the boarding ladder is half of the length in the deployed state, reducing the center of gravity of the boarding ladder and having better stability.

[0059] On the basis of the above embodiment, in a preferred embodiment, the driving component 5 includes a power cylinder 501 and a push rod structure. The bottom of the power cylinder 501 is adapted to be hinged to the vehicle body; the push rod structure is telescopically arranged in the power cylinder 501, and the end of the push rod structure is hinged to the first ladder component 1. Specifically, the power cylinder 501 can be a pneumatic cylinder or a hydraulic cylinder, and the push rod structure can be extended or retracted from the power cylinder 501 through pneumatic or hydraulic action. As Figure 2 shown, an installation part 504 is provided at the bottom of the power cylinder 501, and a hinge hole is provided on the installation part 504. The power cylinder 501 is hinged to the vehicle body through the hinge hole on the installation part 504. It should be noted that the hinge in this embodiment can be a direct hinge or an indirect hinge. The driving component 5 in this embodiment has a simple structure and is convenient for installation. In other alternative embodiments, the driving component 5 can include a driving motor, and the driving motor can be fixed on the vehicle body, and the output shaft of the driving motor is fixedly connected to the first ladder component 1 to enable the first ladder component 1 to rotate within a certain range.

[0060] Specifically, the push rod structure includes a first push rod 502 and a second push rod 503. The first push rod 502 is telescopically arranged in the power cylinder 501; the second push rod 503 is detachably connected to the first push rod 502, and the end of the second push rod 503 is hinged to the first ladder assembly 1. Further refer to Figure 2 , an articulation hole is provided at the end of the second push rod 503, and it can be hinged to the first ladder assembly 1 through this articulation hole. In this embodiment, by making the first push rod 502 and the second push rod 503 detachably connected, it is convenient for the installation and disassembly of the driving assembly 5.

[0061] Specifically, the second push rod 503 is threadedly connected to the first push rod 502. In this embodiment, the connection method between the second push rod 503 and the first push rod 502 is simple and convenient. In other alternative embodiments, the second push rod 503 can be connected to the first push rod 502 by a snap connection.

[0062] As Figure 5 shown, a main support rod 102 is provided on the back of the first ladder assembly 1, and the push rod structure is hinged to the middle of the main support rod 102. Specifically, the length direction of the main support rod 102 is parallel to the width direction of the first ladder assembly 1, and the articulation hole on the second push rod 503 is penetrated through the main support rod 102. In this embodiment, by hinging the push rod structure to the middle of the main support rod 102, only one set of driving assembly 5 can be provided, and the structure is simpler. In other alternative embodiments, two sets of driving assemblies 5 can be provided, and the end of the push rod structure of each set of driving assemblies 5 is hinged to the side of the first ladder assembly 1.

[0063] Specifically, two opposite main support ear rings 101 are provided on the back of the first ladder assembly 1, and the main support rod 102 is arranged between the two main support ear rings 101.

[0064] On the basis of the above embodiment, in a preferred embodiment, the transmission structure includes a connecting member and an adjustable connecting rod. One end of the connecting member is hinged to the first ladder assembly; the length of the adjustable connecting rod 12 is adjustable, the first end of the adjustable connecting rod is hinged to the other end of the connecting member, and the second end of the adjustable connecting rod 12 is hinged to the second ladder assembly. In this embodiment, when the first ladder assembly rotates under the action of the driving assembly, it drives the connecting member to move, the connecting member drives the adjustable connecting rod to move, and the length of the adjustable connecting rod is continuously adjusted during the movement, so as to drive the second ladder assembly to unfold or fold.

[0065] On the basis of the above-mentioned embodiments, in a preferred embodiment, the boarding ladder further comprises a first hinge seat 6, which is suitable for being fixedly connected to the vehicle body, and the bottom of the power cylinder 501 is hinged to the first hinge seat 6. In this embodiment, by providing the first hinge seat 6, during installation, it is only necessary to fix the first hinge seat 6 to the vehicle body, and it is not necessary to connect the power cylinder 501 to the vehicle body, so that the boarding ladder is conveniently installed and connected to the vehicle body. Of course, in other alternative embodiments, the bottom of the power cylinder 501 can be directly hinged to the vehicle body.

[0066] On the basis of the above embodiment, in a preferred embodiment, the first preset angle is equal to the second preset angle, and when the first ladder assembly 1 is in the deployed position, the first ladder assembly 1 is coplanar with the second ladder assembly 2. Figure 9 As shown, when the first ladder assembly 1 is in the deployed position, the first ladder assembly 1 is coplanar with the second ladder assembly 2, which is convenient for users to board. In other alternative embodiments, the first preset angle is not equal to the second preset angle, for example, the second preset angle may be greater than the first preset angle.

[0067] On the basis of the above embodiments, in a preferred embodiment, the boarding ladder further includes a handrail structure, which is provided at least on one side of the first ladder assembly 1 and / or the second ladder assembly 2. Specifically, the handrail structure can be provided on both sides of the first ladder assembly 1 and the second ladder assembly 2; or only on both sides of the first ladder assembly 1; or only on both sides of the second ladder assembly 2; or provided on one side of the first ladder assembly 1 and one side of the second ladder assembly 2; or only on one side of the first ladder assembly 1; or only on one side of the second ladder assembly 2. In this embodiment, by providing the handrail structure, it is convenient for users to board the vehicle, making the boarding process safer.

[0068] In a preferred embodiment, the handrail structure is movably connected to the first ladder assembly 1 and / or the second ladder assembly 2, and when the driving assembly 5 drives the first ladder assembly 1 to rotate, the handrail structure is folded or unfolded in conjunction with the first ladder assembly 1 and / or the second ladder assembly 2. In this embodiment, during the movement of the first ladder assembly and the second ladder assembly, the handrail structure is folded or unfolded in conjunction with the first ladder assembly and / or the second ladder assembly. When the first ladder assembly is folded, the handrail structure is folded so that the boarding ladder occupies less space in the folded state; when the first ladder assembly is unfolded, the handrail structure is unfolded so that the user can board the vehicle safely.

[0069] Based on the above embodiments, in a preferred embodiment, the armrest structure includes an upper armrest 7 and a lower armrest 8. One end of the upper armrest is adapted to be hinged to the vehicle body; one end of the lower armrest 8 is hinged to the other end of the upper armrest 7, and one end is hinged to the first ladder assembly 1. The upper armrest 7, the lower armrest 8, the first ladder assembly 1 and the vehicle body form a four-bar linkage mechanism. In this embodiment, since the upper armrest 7, the lower armrest 8, the first ladder assembly 1 and the vehicle body form a four-bar linkage mechanism, when the first ladder assembly rotates driven by the drive assembly, the upper armrest and the lower armrest move along a preset trajectory. When the first ladder assembly 1 is in the retracted position, the upper armrest 7 and the lower armrest 8 also fold, occupying less space.

[0070] Specifically, the upper armrest 7 is at least provided on one side of the first ladder assembly 1, and includes a first main body portion 701. First hinge portions 702 and second hinge portions 703 are respectively provided at both ends of the first main body portion 701. The first hinge portion 702 is adapted to be hinged to the vehicle body; as Figure 3 and Figure 4 shown, the lower armrest 8 includes a second main body portion 801. A first connecting portion 802 and a second connecting portion 803 are provided on the second main body portion 801. The first connecting portion 802 is hinged to the second hinge portion 703, and the second connecting portion 803 is hinged to the first ladder assembly 1. In other alternative embodiments, the armrest structure may be fixedly connected to the first ladder assembly 1.

[0071] Specifically, as Figure 1 shown, the first main body portion 701 is rod-shaped, and the first hinge portion 702 and the second hinge portion 703 protrude from the first main body portion 701. A hinge hole is provided on the first hinge portion 702, and the hinge hole and the vehicle body are hinged by a third hinge rod 9. The second hinge portion 703 and the first connecting portion 802 of the lower armrest 8 are hinged by a fourth hinge rod 10. The second connecting portion 803 of the lower armrest 8 and the first ladder assembly 1 are hinged by a fifth hinge rod 11. In other alternative embodiments, the first main body portion 701 may be plate-shaped. As Figure 1 and Figure 3 shown, the second main body portion 801 includes a rod-shaped portion suitable for hand-holding and a plate-shaped portion provided with a first connecting portion 802 and a second connecting portion 803. The rod-shaped portion includes two rod segments, and the included angle between the two rod segments is an obtuse angle, so that the lower rod segment is closer to the second ladder assembly 2, and the two rod segments are respectively connected to the plate-shaped portion through connecting rods.

[0072] Based on the above embodiments, in a preferred embodiment, the first connecting portion 802 is detachably connected to the second main body portion 801. In this embodiment, by making the first connecting portion 802 detachably connected to the second main body portion 801, during the installation process, the first connecting portion 802 can be first connected to the second hinged portion 703 and then the first connecting portion 802 can be connected to the second main body portion 801, which is more convenient for installation. In other alternative embodiments, the first connecting portion 802 and the second connecting portion 803 can be an integral structure.

[0073] Specifically, as Figure 3 shown, a threaded seat 805 is provided on the second main body portion 801. An internal thread is provided in the threaded seat 805. One end of the first connecting portion 802 connected to the threaded seat 805 is provided with an external thread. The first connecting portion 802 and the threaded seat 805 are connected by threads. In this embodiment, the connection manner between the second main body portion 801 and the first connecting portion 802 is simple and convenient. In other alternative embodiments, the second main body portion 801 and the first connecting portion 802 can be connected by a snap connection.

[0074] Based on the above embodiments, in a preferred embodiment, further referring to Figure 3 , a first fixing ring 806 is provided at the position where the lower handrail faces the first ladder assembly 1 and is hinged to the first ladder assembly. Specifically, the first fixing ring 806 is provided on the side of the second connecting portion 803 facing the first ladder assembly 1. In this embodiment, the setting of the first fixing ring 806 can reduce the contact area between the second connecting portion 803 and the first ladder assembly 1 and reduce the friction force.

[0075] Based on the above embodiments, in a preferred embodiment, the second connecting portion 803 is hinged to the first ladder assembly 1 by a pin shaft. As Figure 4 shown, a second fixing ring 807 is provided on the side of the second connecting portion 803 facing away from the first ladder assembly 1. The width of the second fixing ring 807 is greater than the width of the first fixing ring 806. Two opposite fixing holes 8071 adapted for a connecting member to pass through are provided on the second fixing ring 807. The connecting member is adapted to pass through the two fixing holes 8071 and the pin shaft, so that the pin shaft is fixedly connected to the second connecting portion 803. The setting of the second fixing ring 807 makes the pin shaft and the second connecting portion 803 connected as a whole, and further makes the movement of the lower handrail 8 more stable. In other alternative embodiments, the pin shaft can be fixedly connected to the first ladder assembly 1 as a whole, and the second fixing ring 807 can rotate relative to the pin shaft.

[0076] In a preferred embodiment, the boarding ladder further includes a second hinge seat 15 which is adapted to be fixedly connected to the vehicle body. The upper handrail 7 and the first ladder assembly 1 are respectively hinged to the second hinge seat 15, and the upper handrail 7, the lower handrail 8, and the first ladder assembly 1 and the second hinge seat 15 form a four-bar linkage mechanism. In this embodiment, the setting of the second hinge seat 15 enables the boarding ladder to be simply fixed to the vehicle body by fixing the second hinge seat 15 during installation, and the installation process is simple and convenient. Of course, in other alternative embodiments, the second hinge seat 15 may not be provided, and the first ladder assembly 1 may be directly hinged to the vehicle body.

[0077] Based on the above embodiment, in a preferred embodiment, the transmission structure includes the lower handrail 8 and an adjustable connecting rod 12 hinged between the lower handrail 8 and the second ladder assembly 2, and the length of the adjustable connecting rod 12 is adjustable. In this embodiment, a part of the lower handrail and the adjustable connecting rod together form the transmission structure. During the movement of the first ladder assembly, the lower handrail and the adjustable connecting rod jointly drive the second ladder assembly to move, ensuring the stable movement of the second ladder assembly, and the structure is simple and compact.

[0078] Specifically, a third connecting portion 804 is further provided on the second main body portion 801, and the adjustable connecting rod 12 is hinged between the third connecting portion 804 and the second ladder assembly 2. Specifically, as Figure 3 and Figure 4 shown, a triangular structure is formed at the three connection points of the first connection portion 802, the second connection portion 803, and the third connection portion 804, making the movement process more stable and reliable, and the structure is relatively simple and compact.

[0079] Specifically, one end of the adjustable connecting rod 12 is hinged to the third connecting portion 804 through a sixth hinge rod 13, and the other end of the adjustable connecting rod 12 is hinged to the second ladder assembly 2 through a seventh hinge rod 14. In this embodiment, when the first ladder assembly 1 is in the deployed position, the extension line of the length of the adjustable connecting rod 12 is collinear with the connection line of the third connecting portion 804 and the first connection portion 802, and the second ladder assembly 2 is locked in the open position. In this embodiment, the transmission structure has a simple structure and is convenient to install. In other alternative embodiments, the adjustable connecting rod 12 can be connected between the first ladder assembly 1 and the second ladder assembly 2, and when the second ladder assembly 2 is in the open position, the length of the adjustable connecting rod 12 is adjusted to the shortest.

[0080] In one embodiment, the first ladder assembly 1 and / or the second ladder assembly 2 includes two relatively arranged guard plates 103 and a plurality of pedal structures 104 arranged between the two guard plates 103. As Figure 5As shown, a first hinge fixing ring 105 is provided at the first end of the guard plate 103 of the first ladder assembly 1. The first hinge fixing ring 105 is hinged to the second hinge seat 15 through a first hinge rod 3; a first folding hinge ring plate 106 is provided at the second end of the guard plate 103 of the first ladder assembly 1. As Figure 7 shown, a second folding hinge ring plate 201 is provided at the first end of the guard plate 103 of the second ladder assembly 2. A second hinge fixing ring 202 is provided on the second folding hinge ring plate 201. The first hinge fixing ring 105 is hinged to the second hinge fixing ring 202 through a second hinge rod 4.

[0081] Specifically, as Figure 6 shown, the pedal structure 104 and the guard plate 103 are connected by bolts 16, nuts 17 and gaskets 18.

[0082] In a preferred embodiment, the guard plate 103 is provided with a plurality of through holes. The arrangement of the through holes can make the guard plate 103 more beautiful, and at the same time, setting the through holes can reduce the weight of the first ladder assembly 1 and the second ladder assembly 2.

[0083] In a preferred embodiment, the pedal structure 104 is a hollow structure, which can further reduce the weight of the first ladder assembly 1 and the second ladder assembly 2.

[0084] Embodiment 2

[0085] This embodiment provides an engineering vehicle, including a vehicle body and a boarding ladder provided in the above embodiment connected to the vehicle body. For the engineering vehicle provided in this embodiment, when the boarding ladder is in a folded state, the center of gravity of the boarding ladder is relatively low, so that the center of gravity of the entire engineering vehicle can be reduced, making the operation process of the engineering vehicle more stable.

[0086] Obviously, the above embodiments are only examples given for clear illustration, and are not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A boarding ladder, characterized in that, include: A first ladder assembly, a first end of which is adapted to be hinged to the vehicle body; a second ladder assembly hinged to the second end of the first ladder assembly; a driving assembly connected to one end of the first ladder assembly close to the second ladder assembly (2), and used for driving the first ladder assembly to rotate relative to the vehicle body so that the first ladder assembly has a folded position and an extended position with a first preset angle relative to the horizontal plane; A transmission structure is connected between the first ladder assembly and the second ladder assembly. When the driving assembly drives the first ladder assembly to rotate, the transmission structure drives the second ladder assembly to move, so that when the first ladder assembly is in the folded position, the second ladder assembly is folded with the first ladder assembly; when the first ladder assembly is in the unfolded position, the second ladder assembly is in an open position with an angle of a second preset angle with a horizontal plane; A handrail structure is provided at least on one side of the first ladder assembly and / or the second ladder assembly, the handrail structure is movably connected to the first ladder assembly and / or the second ladder assembly, and when the driving assembly drives the first ladder assembly to rotate, the handrail structure is folded or unfolded in conjunction with the first ladder assembly and / or the second ladder assembly; The armrest structure includes: an upper armrest, one end of which is suitable for being hinged to the vehicle body; a lower armrest, one end of which is hinged to the other end of the upper armrest and one end of which is hinged to the first ladder assembly, and the upper armrest, the lower armrest, the first ladder assembly and the vehicle body form a four-bar linkage; The transmission structure includes the lower handrail and an adjustable connecting rod hinged between the lower handrail and the second ladder assembly, and the length of the adjustable connecting rod is adjustable.

2. The boarding ladder according to claim 1, characterized in that, When the first ladder assembly (1) is located in the folded position, the first ladder assembly (1) is in a vertical state or a nearly vertical state.

3. The boarding ladder according to claim 1, characterized in that, The transmission structure comprises: A connecting member, one end of which is hinged to the first ladder assembly; An adjustable connecting rod, the length of which can be adjusted, a first end of the adjustable connecting rod is hinged to the other end of the connecting member, and a second end of the adjustable connecting rod is hinged to the second ladder assembly.

4. The boarding ladder according to claim 1, characterized in that, The drive assembly comprises: A power cylinder, the bottom of which is suitable for being hinged to the vehicle body; A push rod structure is telescopically arranged in the power cylinder, and an end of the push rod structure is hinged to the first ladder component.

5. The boarding ladder according to claim 4, characterized in that, The boarding ladder also includes a first hinge seat, which is suitable for being fixedly connected to the vehicle body, and the bottom of the power cylinder is hinged to the first hinge seat.

6. The boarding ladder according to claim 1, characterized in that, The first preset angle is equal to the second preset angle, and when the first ladder assembly is located at the deployed position, the first ladder assembly is coplanar with the second ladder assembly.

7. The boarding ladder according to claim 1, characterized in that, The lower armrest includes a second main body portion, a first connecting portion is provided on the second main body portion, the first connecting portion is hinged to the other end of the upper armrest, and the first connecting portion is detachably connected to the second main body portion.

8. The boarding ladder according to claim 1, characterized in that, A first fixing ring is provided at a position of the lower handrail (8) facing one side of the first ladder component and hinged to the first ladder component.

9. The boarding ladder according to any one of claims 1, 7 and 8, characterized in that, The boarding ladder further includes a second hinge seat, which is adapted to be fixedly connected to the vehicle body. The upper handrail and the first ladder assembly are respectively hinged to the second hinge seat, and the upper handrail, the lower handrail and the first ladder assembly and the second hinge seat form a four-bar linkage mechanism.

10. An engineering vehicle, characterized in that, It includes a vehicle body and a boarding ladder as described in any one of claims 1-9 connected to the vehicle body.

Images