Folding platform ladder

Abstract

The invention discloses a folding platform ladder which comprises a main body unit, a supporting unit and a platform unit, the main body unit comprises a first main beam and a second main beam, the supporting unit comprises a first support and a second support, and the platform unit comprises a pedal platform. During unfolding, the first support of the supporting unit rotates relative to the second main beam and makes contact with the ground so as to support the second main beam, the second support rotates relative to the first main beam and is connected with the first support so as to support the first main beam, the main body unit is connected with the platform unit, and the supporting unit is located below the platform unit. The main body unit and the supporting unit are matched to provide stable supporting for the platform unit, and normal work of the platform ladder is guaranteed. When the platform ladder is folded, the second support and the first support are detached and separated, the first support rotates relative to the second main beam, meanwhile, the first support shrinks until the first support is attached to the second main beam, the second support rotates to be attached to the first main beam, the first main beam is turned over to be attached to the second main beam, and folding of the platform ladder is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation ground support equipment and its peripheral supporting facilities, and particularly to a folding platform ladder. Background Art

[0002] The cockpit of modern aircraft is at a relatively high height. When pilots get on and off the aircraft and ground support personnel perform support work on the aircraft, a platform ladder is required for operation. The platform ladder needs to ensure the required height and stability. Under certain special conditions, the platform ladder needs to be transported with the aircraft and used in different locations.

[0003] Most of the existing platform ladders are fixed platform ladders, which are of a frame structure, large in size and heavy in weight. It requires multiple ground crew members to move them. Due to the size and weight of the ladder body, it cannot be transported and transferred, which greatly affects the convenience and applicability of the platform ladder. Summary of the Invention

[0004] The purpose of the present invention is to provide a folding platform ladder to solve the problems existing in the above related technologies. The platform ladder is designed as a foldable structure, reducing the weight of the platform ladder, enhancing the convenience of the platform ladder, and thus improving the adaptability of the platform ladder.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The present invention provides a folding platform ladder, comprising:

[0007] A main body unit, the main body unit includes a first main beam and a second main beam, the first main beam and the second main beam are hinged and a first locking element is arranged between them, the first locking element can fix the relative positions of the first main beam and the second main beam, when the folding platform ladder is in a retracted state, the first main beam and the second main beam are attached to each other;

[0008] A support unit, the support unit includes a first support and a second support, the first end of the first support is hinged to the second main beam, the second end of the first support can contact the ground, the length of the first support can be adjusted, when the folding platform ladder is in a retracted state, the first support is attached to the second main beam, and the length of the first support is not greater than the length of the second main beam; one end of the second support is hinged to the first main beam, the other end of the second support is detachably connected to the first support, and the connection point of the second support and the first support is located between the first end and the second end of the first support;

[0009] Platform unit, the platform unit includes a foot platform, one end of the foot platform is hinged to the first main beam and a second locking element is provided therebetween, the second locking element can fix the relative position of the foot platform and the first main beam, the platform unit is located above the support unit, when the folding platform ladder is in the retracted state, the foot platform can be folded by a link mechanism, the foot platform is attached to the first main beam and is located on the side of the first main beam away from the second main beam.

[0010] Preferably, the first support includes a support section and a sliding section, one end of the support section is hinged to the second main beam, the other end of the support section is slidably sleeved outside the sliding section, and the end of the sliding section away from the support section can contact the ground; the second support is detachably connected to the support section.

[0011] Preferably, a support wheel is connected to the end of the sliding section in contact with the ground, the support wheel is rotatably arranged on a mounting frame, and the mounting frame is rotatably connected to the sliding section.

[0012] Preferably, the support unit further includes a limiting rod, one end of the limiting rod is hinged to the first support, the other end of the limiting rod is hinged to the second main beam, and the limiting rod, the first support and the second main beam enclose a triangular structure, and the limiting rod is a split structure and can be folded.

[0013] Preferably, the support unit further includes an inclined support, one end of the inclined support is hinged to the first support, and the other end of the inclined support is inclined in a direction away from the first support and can contact the ground.

[0014] Preferably, the inclined support is connected with a mounting seat, the mounting seat is rotatably connected to the first support, and an included angle is formed between the rotation axis of the mounting seat and the plane where the first support and the second support are located.

[0015] Preferably, both the first main beam and the second main beam include two longitudinal beams and a cross beam connecting the two longitudinal beams, the number of the cross beams is multiple groups, and the cross beams are arranged in parallel;

[0016] The first support is hinged to the longitudinal beam of the second main beam, the second support is hinged to the longitudinal beam of the first main beam, and two groups of the first support and the second support are provided;

[0017] The first main beam is further connected with a side beam, and the side beam is arranged on the side surface of the longitudinal beam of the first main beam.

[0018] Preferably, the ends of the two first supports away from the second main beam are connected to form a U-shaped structure;

[0019] Reinforcing elements are provided between the two first supports and between the two second supports, and the reinforcing elements are in an X-shaped structure.

[0020] Preferably, the platform unit further includes a first armrest and a second armrest. The first armrest and the second armrest are respectively hinged to the foot platform, and the first armrest and the second armrest adopt an asymmetric structure.

[0021] Preferably, a contact beam is further connected to one end of the second main beam away from the first main beam, and the contact beam is arranged on the side away from the support unit.

[0022] The present invention achieves the following technical effects compared with the related art: The foldable platform ladder of the present invention includes a main body unit, a support unit, and a platform unit. Among them, the main body unit includes a first main beam and a second main beam. The first main beam and the second main beam are hinged and a first locking element is arranged between them. The first locking element can fix the relative positions of the first main beam and the second main beam. When the foldable platform ladder is in the retracted state, the first main beam and the second main beam are attached to each other; the support unit includes a first support and a second support. The first end of the first support is hinged to the second main beam, and the second end of the first support can contact the ground. The length of the first support can be adjusted. When the foldable platform ladder is in the retracted state, the first support is attached to the second main beam, and the length of the first support is not greater than the length of the second main beam; one end of the second support is hinged to the first main beam, and the other end of the second support is detachably connected to the first support. The connection point between the second support and the first support is located between the first end and the second end of the first support; the platform unit includes a foot platform. One end of the foot platform is hinged to the first main beam and a second locking element is arranged between them. The second locking element can fix the relative positions of the foot platform and the first main beam. The platform unit is located above the support unit. When the foldable platform ladder is in the retracted state, the foot platform is attached to the first main beam and is located on the side of the first main beam away from the second main beam.

[0023] The folding platform ladder of the present invention, when unfolded, the first main beam and the second main beam of the main body unit are located in the same plane. The first support of the support unit rotates relative to the second main beam and contacts the ground to support the second main beam. The second support rotates relative to the first main beam and is connected to the first support to support the first main beam. The plane where the first support and the second support are located is substantially perpendicular to the plane where the first main beam and the second main beam are located, so as to provide stable support for the main body unit. The main body unit is connected to the platform unit, and the support unit is located below the platform unit. The main body unit and the support unit cooperate to provide stable support for the platform unit, ensuring the normal operation of the platform ladder. When the platform ladder of the present invention is retracted, the foot platform is flipped and retracted relative to the main body unit and locked by the second locking element. The second support is disassembled and separated from the first support. The first support rotates relative to the second main beam, and at the same time, the first support contracts until the first support fits with the second main beam. The second support rotates to fit with the first main beam, the locking of the first locking element is released, and the first main beam is flipped to fit with the second main beam, realizing the retraction of the platform ladder. The folding platform ladder of the present invention has a simple and compact structure and can provide stable support for the foot platform during operation; the retraction operation is convenient, and the space occupied by the platform ladder after retraction is small, which is beneficial to improving the flexible adaptability of the platform ladder. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 It is a front view schematic diagram of the folding platform ladder of the present invention in the unfolded state;

[0026] Figure 2 It is a side view schematic diagram of the folding platform ladder of the present invention in the unfolded state;

[0027] Figure 3 It is a front view schematic diagram of the folding platform ladder of the present invention in the retracted state;

[0028] Figure 4 It is a side view schematic diagram of the folding platform ladder of the present invention in the retracted state.

[0029] In the figure: 1. Main body unit; 101. First main beam; 102. Second main beam; 103. Longitudinal beam; 104. Cross beam; 105. Contact beam; 106. Side beam;

[0030] 2. Support unit; 201. First support; 202. Second support; 203. Support section; 204. Sliding section; 205. Connection block; 206. Adjustment section; 207. Connection pin; 208. Support wheel; 209. Limiting rod; 210. Diagonal support; 211. Mounting base; 212. Reinforcement element;

[0031] 3. Platform unit; 301. Foot platform; 302. First armrest; 303. Second armrest; 304. Platform link; 305. Hinge link. Detailed implementation

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] The purpose of the present invention is to provide a foldable platform ladder to solve the problems existing in the above related technologies. The platform ladder is designed as a foldable structure, reducing the weight of the platform ladder, improving the convenience of the platform ladder, and further enhancing the adaptability of the platform ladder.

[0034] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0035] Embodiment 1

[0036] This embodiment provides a foldable platform ladder. Please refer to Figures 1 - 4, including a main body unit 1, a support unit 2 and a platform unit 3. Among them, the main body unit 1 includes a first main beam 101 and a second main beam 102. The first main beam 101 and the second main beam 102 are hinged and a first locking element is arranged between them. The first locking element can fix the relative positions of the first main beam 101 and the second main beam 102. When the folding platform ladder is in the retracted state, the first main beam 101 and the second main beam 102 are attached to each other; the support unit 2 includes a first support 201 and a second support 202. The first end of the first support 201 is hinged to the second main beam 102, and the second end of the first support 201 can contact the ground. The length of the first support 201 can be adjusted. When the folding platform ladder is in the retracted state, the first support 201 is attached to the second main beam 102, and the length of the first support 201 is not greater than the length of the second main beam 102; one end of the second support 202 is hinged to the first main beam 101, and the other end of the second support 202 is detachably connected to the first support 201. The connection point between the second support 202 and the first support 201 is located between the first end and the second end of the first support 201; the platform unit 3 includes a foot platform 301. One end of the foot platform 301 is hinged to the first main beam 101 and a second locking element is arranged between them. The second locking element can fix the relative positions of the foot platform 301 and the first main beam 101. The platform unit 3 is located above the support unit 2. When the folding platform ladder is in the retracted state, the foot platform 301 can be folded by a linkage mechanism. The foot platform 301 is attached to the first main beam 101 and is located on the side of the first main beam 101 away from the second main beam 102.

[0037] The folding platform ladder of the present invention, when unfolded, the first main beam 101 and the second main beam 102 of the main body unit 1 are in the same plane. The first support 201 of the support unit 2 rotates relative to the second main beam 102 and contacts the ground to support the second main beam 102. The second support 202 rotates relative to the first main beam 101 and connects to the first support 201 to support the first main beam 101. The plane where the first support 201 and the second support 202 are located is substantially perpendicular to the plane where the first main beam 101 and the second main beam 102 are located, so as to provide stable support for the main body unit 1. The main body unit 1 is connected to the platform unit 3, and the support unit 2 is located below the platform unit 3. The main body unit 1 and the support unit 2 cooperate to provide stable support for the platform unit 3, ensuring the normal operation of the platform ladder. When the platform ladder of the present invention is retracted, the foot platform 301 flips and retracts relative to the main body unit 1 and is locked by the second locking element. The second support 202 is disassembled and separated from the first support 201. The first support 201 rotates relative to the second main beam 102. At the same time, the first support 201 contracts until the first support 201 fits with the second main beam 102. The second support 202 rotates to fit with the first main beam 101. The locking of the first locking element is released, and the first main beam 101 is flipped to fit with the second main beam 102, realizing the retraction of the platform ladder. The folding platform ladder of the present invention has a simple and compact structure and can provide stable support for the foot platform 301 during operation; the retraction operation is convenient, and the occupied space of the platform ladder after retraction is small, which is beneficial to improving the flexible adaptability of the platform ladder.

[0038] Here it needs to be explained that the plane where the first support 201 and the second support 202 are located is substantially perpendicular to the plane where the first main beam 101 and the second main beam 102 are located. Specifically, when the platform ladder is unfolded, the first support 201 and the second main beam 102 form a herringbone structure. Similarly, the second support 202 and the first main beam 101 form a herringbone structure to provide stable support for the first main beam 101 and the second main beam 102. The plane where the first support 201 and the second support 202 are located is substantially perpendicular to the plane where the first main beam 101 and the second main beam 102 are located, which means the included angle between the plane where the first support 201 and the second support 202 are located and the plane where the first main beam 101 and the second main beam 102 are located is within a certain range with 90° as the reference, based on the criterion of ensuring that the first support 201 and the second support 202 can stably support the first main beam 101 and the second main beam 102. And when the plane where the first support 201 and the second support 202 are located is substantially perpendicular to the plane where the first main beam 101 and the second main beam 102 are located, after the platform ladder is retracted, the support unit 2 can closely adhere to the main body unit 1, minimizing the volume of the platform ladder after retraction.

[0039] Among them, the first support 201 includes a support section 203 and a sliding section 204. One end of the support section 203 is hinged to the second main beam 102, and the other end of the support section 203 is slidably sleeved outside the sliding section 204. The end of the sliding section 204 away from the support section 203 can contact the ground. The first support 201 is set as a telescopic structure, which can reduce the occupied space when retracted and improve the portability of the platform ladder. It should also be noted that locking elements are provided on the support section 203 and the sliding section 204 to lock the relative positions of the support section 203 and the sliding section 204 when the sliding section 204 slides in place, ensuring the structural stability of the first support 201. When retracted, the sliding section 204 can unlock the locking element and slide relative to the support section 203. The locking element can be a ball locking structure or other locking structures to meet the requirements of the deployment and retraction of the first support 201. The second support 202 is detachably connected to the support section 203 to ensure that the second support 202 can provide stable support for the first main beam 101 when connected to the first support 201.

[0040] It should also be noted that a support wheel 208 is connected to the end of the sliding section 204 in contact with the ground. The support wheel 208 is rotatably arranged on the mounting bracket, and the mounting bracket is rotatably connected to the sliding section 204. The setting of the support wheel 208 facilitates the deployment and retraction of the first support 201 and improves the operation convenience. At the same time, the support wheel 208 facilitates the movement of the platform ladder. The operator slightly lifts the main body unit 1, and the platform ladder can be conveniently moved by using the support wheel 208. In addition, in practical applications, the support wheel 208 can be set as an angle-adjustable structure. When the platform ladder is retracted, the direction of the support wheel 208 is rotated to reduce the occupied space of the support wheel 208 and further reduce the volume of the platform ladder after retraction.

[0041] To further ensure the structural stability of the support unit 2 and the main body unit 1, the support unit 2 further includes a limiting rod 209. One end of the limiting rod 209 is hinged to the first support 201, and the other end of the limiting rod 209 is hinged to the second main beam 102. The limiting rod 209, the first support 201, and the second main beam 102 form a triangular structure to limit the extreme positions of the first support 201 and the second main beam 102 and prevent the two from rotating and misaligning, further ensuring the structural stability of the platform ladder. It should also be emphasized that the limiting rod 209 is a split structure so that the limiting rod 209 can be folded and retracted. In this specific embodiment, the limiting rod 209 includes two sub-rod sections. The two sub-rod sections are respectively hinged to the first support 201 and the second main beam 102, and the two sub-rod sections are hinged. When the platform ladder is retracted, the first support 201 rotates relative to the second main beam 102, and the two sub-rod sections of the limiting rod 209 rotate relative to each other to achieve folding and retraction, avoiding affecting the retraction of the first support 201 and further reducing the occupied space of the platform ladder after retraction.

[0042] Specifically, the support unit 2 further includes an inclined support 210. One end of the inclined support 210 is hinged to the first support 201, and the other end of the inclined support 210 is inclined away from the first support 201 and can contact the ground. The addition of the inclined support 210 to the support unit 2 enables the end of the inclined support 210 to contact the ground, further enhancing the structural stability of the support unit 2. When the platform ladder is retracted, the inclined support 210 flips and clings to the first support 201, reducing the occupied space. It should also be explained here that in this specific embodiment, the inclined support 210 and the first support 201 achieve position limitation by using their own structures. When the inclined support 210 is unfolded, it rotates into place when it is unfolded until its end abuts against the first support 201 and cannot rotate further. Reasonably selecting the structure of the inclined support 210 and setting the end size of the inclined support 210 to achieve position limitation are common means for those skilled in the art and will not be elaborated here.

[0043] In this specific embodiment, the inclined support 210 is connected with a mounting seat 211. The mounting seat 211 is rotatably connected to the first support 201. The rotation axis of the mounting seat 211 has an included angle with the plane where the first support 201 and the second support 202 are located. When the inclined support 210 is unfolded, the inclined support 210 is not in the same plane as the first support 201 and the second support 202. The inclined support 210 extends obliquely away from the plane where the first support 201 and the second support 202 are located, further enhancing the support effect of the support unit 2 and ensuring the structural stability of the platform ladder.

[0044] More specifically, both the first main beam 101 and the second main beam 102 include two longitudinal beams 103 and a cross beam 104 connecting the two longitudinal beams 103. The number of cross beams 104 is multiple groups, and the cross beams 104 are arranged in parallel, facilitating the user to step on and off the foot platform 301 and improving the usability of the platform ladder.

[0045] Among them, the first support 201 is hinged to the longitudinal beam 103 of the second main beam 102, and the second support 202 is hinged to the longitudinal beam 103 of the first main beam 101. Two groups of the first support 201 and the second support 202 are provided to provide stable support for the main body unit 1. To facilitate the user to get on and off, the first main beam 101 is further connected with a side beam 106. The side beam 106 is arranged on the side of the longitudinal beam 103 of the first main beam 101. When getting on and off the platform unit 3 through the main body unit 1, the user can hold the side beam 106 for leverage to ensure safety when getting on and off.

[0046] In practical applications, the ends of the two first supports 201 away from the second main beam 102 are connected to form a U-shaped structure, increasing the contact area between the first support 201 and the ground and improving the structural stability of the first support 201. When unfolding the platform ladder, the operator can simultaneously pull apart the two first supports 201 at the connection of the two first supports 201, improving the operation convenience.

[0047] In other specific embodiments that can be realized by the present invention, strengthening elements 212 are provided between the two first supports 201 and between the two second supports 202. The strengthening element 212 has an X-shaped structure to further enhance the structural strength of the support unit 2, ensure the structural stability of the platform ladder, and improve the safety factor of using the platform ladder.

[0048] Furthermore, the platform unit 3 further includes a first handrail 302 and a second handrail 303. The first handrail 302 and the second handrail 303 are respectively hinged to the foot platform 301. When unfolded, it protects the safety of the users. When retracted, the first handrail 302 and the second handrail 303 are rotated to fit with the foot platform 301, reducing the occupied space after retraction. To ensure stable use and convenience of retraction, locking elements are provided between the first handrail 302 and the second handrail 303 and the foot platform 301, and appropriate locking elements can be selected according to the locking requirements. It should be emphasized that the first handrail 302 and the second handrail 303 adopt an asymmetric structure, which can reduce the occupied space after flipping and retracting, and further reduce the volume of the platform ladder after retraction.

[0049] In this specific embodiment, the foot platform 301 is connected to the first main beam 101 by a platform link 304 and a hinge link 305. The platform link 304, the foot platform 301, the hinge link 305, and the first main beam 101 form a four-bar linkage mechanism. The four-bar linkage mechanism can be used to conveniently realize the retraction and deployment of the foot platform 301, and the deployment and folding are convenient and the structural stability is relatively high.

[0050] In addition, it should be noted that a contact beam 105 is further connected to the end of the second main beam 102 far from the first main beam 101. The contact beam 105 is arranged on the side away from the support unit 2. When the platform ladder is deployed, the contact beam 105 contacts the ground, increasing the contact area between the main body unit 1 and the ground, and further improving the structural stability of the platform ladder. In this specific embodiment, when the platform ladder is deployed, there is a certain angle between the first main beam 101 and the second main beam 102 and the ground, that is, the first main beam 101 and the second main beam 102 are inclined. The angle between the contact beam 105 and the second main beam 102 is an obtuse angle, so that it is parallel to the ground to ensure stable contact between the contact beam 105 and the ground.

[0051] The folding platform ladder of the present invention can be deployed during work and extended to the required height. During transportation and transfer, the platform ladder can be retracted to the smallest volume. While ensuring strength and stiffness, it is light in weight and small in volume after retraction, and can be easily transported, with good mobility. Compared with the boarding ladder in the prior art, the folding platform ladder of the present invention realizes semi-automatic retraction and extension, enabling ground crew to perform the retraction and extension operations of the platform ladder alone, improving the operation efficiency and safety, and at the same time improving the adaptability of the platform ladder.

[0052] Embodiment 2

[0053] This embodiment provides a folding platform ladder. In this embodiment, a connecting block 205 is provided at one end of the second support 202 close to the first support 201, and an adjusting section 206 is provided at one end of the second support 202 close to the connecting block 205. Rotating the adjusting section 206 can drive the connecting block 205 to reciprocate along the length direction of the second support 202. The connecting block 205 is provided with a connecting hole, and the first support 201 is provided with a connecting pin 207 adapted to the connecting hole. When it is necessary to connect the second support 202 to the first support 201, the adjusting section 206 can be rotated to sleave the connecting hole outside the connecting pin 207, and then the adjusting section 206 is rotated in the opposite direction to make the second support 202 tighten the connecting pin 207 by using the connecting hole, so as to realize the connection between the first support 201 and the second support 202. The connecting pin 207 can rotate in the connecting hole, reducing the assembly connection difficulty between the first support 201 and the second support 202 and ensuring convenient operation; in practical applications, other connection methods can also be adopted for the first support 201 and the second support 202. For example, both are provided with pin holes, and the connection between the two is realized by inserting and pulling out the positioning pin.

[0054] In this embodiment, the first handrail 302 and the second handrail 303 respectively select hinges that can be locked to realize the hinged connection with the foot platform 301 and can be locked at the same time. The hinge that can be locked includes structures such as a locking pin, a return spring, a dial block, and a wire, etc., to realize the flipping locking and unlocking retraction of the first handrail 302 and the second handrail 303, and the structure is compact and practical; in practical applications, other types of hinge structures can also be selected. Selecting a suitable type and structure of hinge is a common means for those skilled in the art, and will not be elaborated here.

[0055] The other structures of the folding platform ladder in this embodiment are the same as those in Embodiment 1, and will not be elaborated here.

[0056] Specific examples are applied in the present invention to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A foldable platform ladder, characterized in that: include: A main body unit, the main body unit comprising a first main beam and a second main beam, the first main beam and the second main beam are hinged and a first locking element is arranged between the first main beam and the second main beam, the first locking element can fix the relative position of the first main beam and the second main beam, and when the foldable platform ladder is in a retracted state, the first main beam and the second main beam are in contact with each other; A support unit, the support unit comprising a first support and a second support, the first end of the first support being hinged to the second main beam, the second end of the first support being capable of contacting the ground, the length of the first support being adjustable, the first support being in contact with the second main beam when the foldable platform ladder is in a retracted state, and the length of the first support being no greater than the length of the second main beam; One end of the second support is hinged to the first main beam, the other end of the second support is detachably connected to the first support, and the connection point between the second support and the first support is located between the first end and the second end of the first support; A platform unit, wherein the platform unit includes a foot platform, one end of the foot platform is hinged to the first main beam and a second locking element is arranged therebetween, the second locking element can fix the relative position of the foot platform and the first main beam, the platform unit is located above the support unit, and when the foldable platform ladder is in a retracted state, the foot platform can be folded using a connecting rod mechanism, and the foot platform is in contact with the first main beam and is located on a side of the first main beam away from the second main beam.

2. The foldable platform ladder according to claim 1, characterized in that: The first support includes a support section and a sliding section, one end of the support section is hinged to the second main beam, the other end of the support section is slidably mounted on the outside of the sliding section, and the end of the sliding section away from the support section can contact the ground; the second support is detachably connected to the support section.

3. The foldable platform ladder according to claim 2, characterized in that: One end of the sliding section in contact with the ground is connected with a supporting wheel, and the supporting wheel is rotatably arranged on a mounting frame, and the mounting frame is rotatably connected to the sliding section.

4. The foldable platform ladder according to claim 1, characterized in that: The support unit also includes a limiting rod, one end of which is hinged to the first support, and the other end of which is hinged to the second main beam, and the limiting rod, the first support and the second main beam form a triangular structure, and the limiting rod is a split structure and can be folded.

5. The foldable platform ladder according to any one of claims 1 to 4, characterized in that: The support unit further includes an oblique support, one end of which is hinged to the first support, and the other end of which is inclined in a direction away from the first support and can contact the ground.

6. The foldable platform ladder according to claim 5, characterized in that: The oblique support is connected to a mounting seat, and the mounting seat is rotatably connected to the first support. An angle is formed between the rotation axis of the mounting seat and the plane where the first support and the second support are located.

7. The foldable platform ladder according to claim 1, characterized in that: The first main beam and the second main beam each include two longitudinal beams and a cross beam connecting the two longitudinal beams, the number of the cross beams is multiple groups, and the cross beams are arranged in parallel; The first support is hinged to the longitudinal beam of the second main beam, the second support is hinged to the longitudinal beam of the first main beam, and two groups of the first support and the second support are provided; The first main beam is also connected to a side beam, and the side beam is arranged on the side of the longitudinal beam of the first main beam.

8. The foldable platform ladder according to claim 7, characterized in that: The two first supports are connected at one end away from the second main beam to form a U-shaped structure; A reinforcing element is disposed between the two first supports and between the two second supports, and the reinforcing element is an X-shaped structure.

9. The foldable platform ladder according to claim 1, characterized in that: The platform unit further comprises a first armrest and a second armrest, wherein the first armrest and the second armrest are respectively hinged to the foot platform, and the first armrest and the second armrest adopt an asymmetric structure.

10. The foldable platform ladder according to claim 1, characterized in that: An end of the second main beam away from the first main beam is further connected to a contact beam, and the contact beam is arranged toward a side away from the supporting unit.

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