Folding ladder stand and tank container

Abstract

The invention relates to a folding ladder stand and a tank container. The folding ladder stand is arranged on a frame of the tank container and comprises a supporting stand column, a plurality of pedals and a grab rail. The supporting stand columns are connected between the top and the bottom of the frame. The pedals are arranged at intervals in the height direction of the supporting stand column and rotationally connected with the supporting stand column. The folding ladder stand is further provided with a limiting component used for limiting the unfolding angle of the pedal. The grab rail is rotationally connected with the pedals, the grab rail and the supporting stand columns are located on the two sides of the pedals in the width direction respectively, and the grab rail can coincide with the pedals. When the folding ladder stand is unfolded, all the pedals can be approximately parallel to the ground so that workers can go up and down the tank conveniently, and the grab rails can guarantee the safety of the workers going up and down the tank. In the folding process, the pedals can be parallel to the supporting stand columns, the grab rails can be folded and overlapped relative to the pedals, the overall thickness of the folding ladder stand is small, the occupied space of the folding ladder stand is reduced, and the ladder stand can be conveniently arranged in the limited space of a tank container.

Description

Technical Field

[0001] The present invention relates to the technical field of containers, and in particular to a folding ladder and a tank container. Background Art

[0002] In order to facilitate the operation of the valves on the top of the tank container, ladders are usually installed at the front end, rear end or both ends of the tank container. The design of the ladder is mainly based on a fixed welded structure. This fixed welded structure is subject to the limitations of the inherent structure of the tank container. Usually, the ladder pedal is designed to be a very narrow structure so that the ladder can be accommodated in the limited space of the tank container. However, the narrow pedal is not convenient for workers to climb up and down the ladder, and there are also safety hazards. Summary of the invention

[0003] One purpose of the present invention is to solve the deficiencies in the prior art and provide a folding ladder that is easy to fold and takes up little storage space. To solve the above technical problems, the present invention adopts the following technical solutions:

[0004] A folding ladder is arranged on the frame of a tank box, and the folding ladder comprises:

[0005] Support columns connected between the top and bottom of the frame;

[0006] A plurality of pedals are arranged at intervals along the height direction of the support column, each pedal is rotatably connected to the support column, and has a folded position folded relative to the support column and an unfolded position arranged at an angle relative to the support column. The folding ladder is also provided with a limiting component for limiting the unfolding angle of the pedal relative to the support column; and

[0007] A handrail is rotatably connected to each pedal, and the handrail is rotatably connected to the support column on both sides of the pedal width direction;

[0008] When the pedal is in the unfolded position, the handrail rod and the supporting column are arranged in parallel along the front-rear direction of the frame; when the pedal is in the folded position, the handrail rod can overlap with each pedal.

[0009] In one embodiment, each pedal has a front side and a rear side opposite to each other, the support column is rotatably connected to the rear side of the pedal, and the handrail is rotatably connected to the front side of the pedal.

[0010] In one embodiment, there are two supporting columns, and the two supporting columns are rotatably connected to two ends of the rear side of each pedal, so that each pedal is rotatably connected between the two supporting columns.

[0011] In one embodiment, each supporting column is formed with a receiving groove along its height direction, and the handrail rod can be received in the receiving groove.

[0012] In one embodiment, both ends of the front side of the pedal are respectively provided with pins, and the handrail is provided with connecting holes corresponding to the pins. The handrail is inserted into the connecting holes through the pins and can be rotatably connected to the pedal.

[0013] In one of the embodiments, connecting blocks are respectively provided at both ends of the front side of the pedal, the pin shaft is fixed on the connecting blocks, and the connecting blocks are provided with avoidance grooves for avoiding the supporting columns.

[0014] In one embodiment, the limiting component includes a first limiting block and a second limiting block, the first limiting block is arranged on the supporting column, and the second limiting block is arranged on the pedal corresponding to the first limiting block, and the first limiting block can be offset against the second limiting block to keep the pedal in the expanded position relative to the supporting column.

[0015] In one embodiment, the number of the supporting column is one, and the supporting column is rotatably connected to the middle portion of the rear side portion of each pedal.

[0016] In one embodiment, the limiting component is a limiting hinge, and the two ends of the handrail rod are rotatably connected to the top and bottom of the frame through the limiting hinges respectively;

[0017] The limit hinge includes a first chain body and a second chain body, one end of the first chain body is fixed to the frame, the other end of the first chain body is hinged to one end of the second chain body, the other end of the second chain body is hinged to the end of the handrail, the second chain body has a fixed expansion angle relative to the first chain body, and the pedal follows the handrail and can be maintained in an expanded position relative to the support column. An object of the present invention is to provide a tank container, including a tank body and a frame connected to the outside of the tank body, and a folding ladder arranged on the frame, the folding ladder is a folding ladder as described in any of the above items, and the folding ladder is arranged at the end or both sides of the frame.

[0018] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0019] In the present invention, each pedal is rotatably connected to the support column, and the handrail is rotatably connected to each pedal. The handrail and the support column are respectively located on both sides of the width direction of the pedal, and the handrail and the support column can be arranged in parallel along the front-back direction of the frame. When each pedal is unfolded relative to the support column, each pedal can be in a substantially parallel position relative to the ground, so that it is convenient for the staff to get on and off the tank container. At the same time, the handrail can follow each pedal and be arranged at an angle relative to each pedal, so that the staff can have handrail support when getting on and off the tank container, thereby improving the safety of the staff getting on and off the tank container. When each pedal is folded relative to the support column, each pedal can be parallel to the height direction of the support column, and the handrail can be folded and overlapped relative to each pedal, so that the overall thickness of the folding ladder is small. Thereby, not only the width of the pedal can be designed to be larger, but also the comfort of the staff getting on and off the tank container is improved. At the same time, the occupied space of the folding ladder is reduced, which is convenient for the ladder to be arranged in the limited space of the tank container. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a foldable ladder in an unfolded state according to an embodiment of the present invention.

[0021] Figure 2 yes Figure 1 A schematic diagram of a foldable ladder shown in a folded state.

[0022] Figure 3 yes Figure 2 The structure shown is a schematic cross-sectional view along the AA direction.

[0023] Figure 4 yes Figure 1 A schematic structural diagram of the pedals of a folding ladder is shown.

[0024] Figure 5 It is a structural schematic diagram of a folding ladder including a support assembly in an unfolded state according to an embodiment of the present invention.

[0025] Figure 6 yes Figure 5 The folding ladder shown is a schematic diagram viewed along the direction of arrow B.

[0026] Figure 7 yes Figure 5 A schematic diagram of a foldable ladder shown in a folded state.

[0027] Figure 8 It is a schematic diagram of a foldable ladder in another embodiment of the present invention in an unfolded state.

[0028] Fig. 9 yes Figure 8 A schematic diagram of a foldable ladder shown in a folded state.

[0029] Fig.10 yes Fig. 9 The structure shown is a schematic cross-sectional view along the CC direction.

[0030] The following are the descriptions of the reference numerals:

[0031] 10-tank container; 101-tank body; 102-frame;

[0032] 20-Folding ladder;

[0033] 100-support column;

[0034] 110 - receiving groove; 120 - positioning beam;

[0035] 200-Pedals;

[0036] 210-front side portion; 220-rear side portion; 230-pin shaft member;

[0037] 240-connecting block; 241-avoidance groove; 250-connecting shaft;

[0038] 300-handrail;

[0039] 400-limiting component;

[0040] 410-first limiting block; 420-second limiting block;

[0041] 430-limiting hinge; 431-first chain body; 432-second chain body; 433-limiting plate;

[0042] 500-support assembly;

[0043] 510 - support rod; 511 - positioning slot; 520 - spring pin. DETAILED DESCRIPTION

[0044] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0045] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] The present invention provides a tank container 10, comprising a tank body 101, a frame 102 connected to the outside of the tank body 101, and a folding ladder 20 arranged on the frame 102. The folding ladder 20 is arranged at the end or both sides of the frame 102.

[0048] See also Figure 1 and Figure 2 As shown, the folding ladder 20 proposed by the present invention is arranged on the frame 102 of the tank container. The folding ladder 20 includes a support column 100 and a plurality of pedals 200, and a handrail 300. The support column 100 is connected between the top and the bottom of the frame 102. The plurality of pedals 200 are arranged at intervals along the height direction of the support column 100, and each pedal 200 is rotatably connected to the support column 100. Each pedal 200 can be folded and unfolded relative to the support column 100, so that the folding ladder 20 has two states: folded and unfolded.

[0049] In the present application, the side of the frame 102 facing away from the tank body 101 is the front, and the side of the frame 102 close to the tank body 101 is the back. When the staff faces the tank container 10, the side of the frame 102 close to the staff is the front, and the side away from the staff is the back. For example, the front side 210 of the pedal 200 refers to the side of the pedal 200 away from the tank body 101 in the deployed position. The rear side 220 of the pedal 200 refers to the side of the pedal 200 close to the tank body 101 in the deployed position. With the pedal 200 in the deployed position as a reference, the width direction of the pedal 200 is the front-to-back direction.

[0050] Since the support column 100 is arranged along the height direction of the frame 102, when each pedal 200 is unfolded relative to the support column 100, there is an angle between each pedal 200 and the support column 100, so that each pedal 200 can be in a substantially parallel position relative to the ground, so that it is convenient for the staff to get on and off the tank container. When each pedal 200 is folded relative to the support column 100, each pedal 200 can be parallel to the height direction of the support column 100, so that the overall thickness of the folding ladder 20 is small. At this time, the maximum thickness of the folding ladder 20 does not exceed the sum of the thickness of the pedal 200 and the thickness of the support column 100, and can be reduced to the thickness of the support column 100 or the pedal 200. Therefore, not only the width of the pedal 200 can be designed to be larger, for example, the maximum width of the pedal 200 does not exceed the dimension of the frame 102 along the front and rear direction, which improves the comfort of the staff to get on and off the tank container 101. At the same time, the occupied space of the folding ladder 20 is reduced, which is convenient for the ladder 20 to be arranged in the limited space of the tank container.

[0051] In addition, the handrail 300 is rotatably connected to each pedal 200. The handrail 300 is connected to the support column 100 on both sides of the width direction of the pedal 200. When the pedal 200 is in the unfolded position, the handrail 300 and the support column 100 are arranged in parallel along the front-back direction of the frame 102. When each pedal 200 is unfolded relative to the support column 100, the handrail 300 moves with each pedal 200 while maintaining a posture parallel to the support column 100. The handrail 300 can be set at an angle relative to each pedal 200, so that the staff can have handrail support when getting on and off the tank container, which improves the safety of the staff when getting on and off the tank container.

[0052] When each pedal 200 is folded relative to the support column 100, the handrail 300 can be folded and overlapped relative to each pedal 200. At this time, the handrail 300 and each pedal 200 are parallel to the support column 100. Figure 3 As shown, the handrail 300 is folded and overlapped with each pedal 200, which is specifically manifested as: looking along the width direction of the folding ladder 20, the outline of the handrail 300 is completely included in the outline of the pedal 200. Therefore, the handrail 300 and the pedal 200 only occupy one thickness dimension along the thickness direction of the folding ladder 20, so that the overall thickness of the folding ladder 20 is relatively small. At this time, the maximum thickness of the folding ladder 20 does not exceed the sum of the thickness of the pedal 200 or the handrail 300 and the thickness of the support column 100 (refer to Fig.10 H1 shown in FIG. 1 ) can be reduced to the thickness of the support column 100 or the pedal 200 or the handrail 300 (see FIG. Figure 3 H2 shown). Thus, the foldable ladder 20 of the present application can greatly reduce the occupied space, making it easier to arrange the ladder 20 in the limited space of the tank container.

[0053] In the present application, the support column 100, each pedal 200 and the handrail 300 can be made of aluminum alloy, stainless steel, ordinary steel and other materials, so that the folding ladder 20 has a higher structural strength.

[0054] Among them, the pedal 200 can be provided with an anti-skid structure on the surface for the staff to step on. For example, an anti-skid pattern is designed on the surface of the pedal 200, and the anti-skid pattern includes but is not limited to a plurality of convex points or a plurality of wavy patterns and the like.

[0055] In addition, the number of the handrails 300 can be designed to be two, and the two handrails 300 are rotatably connected to the two ends of each pedal 200 respectively.

[0056] See also Figure 1 , the support column 100 can be relatively fixedly connected to the top and bottom of the frame 102. Figure 5 As shown, both ends of the support column 100 may also be rotatably connected to the top and bottom of the frame 102 respectively.

[0057] Furthermore, the support column 100 may be vertically disposed between the top and the bottom of the frame 102. Of course, in some other embodiments, the support column 100 may also be tilted at a certain angle relative to the vertical direction. Or the support column 100 may be switched between a vertical setting and a tilted setting.

[0058] The pedal 200 and the support column 100 may be rotatably connected in the following manner: each pedal 200 has a front side portion 210 and a rear side portion 220 opposite to each other, and the support column 100 is rotatably connected to the rear side portion 220 of the pedal 200 .

[0059] Embodiment 1

[0060] See also Figures 1 to 3 As shown, there are two support columns 100 , and the two support columns 100 are rotatably connected to both ends of the rear side portion 220 of each pedal 200 , respectively, so that each pedal 200 is rotatably connected between the two support columns 100 .

[0061] Combination Figure 4 As shown, two connecting shafts 250 are respectively disposed at both ends of the rear side portion 220 of each pedal 200, and the two supporting columns 100 are provided with connecting holes corresponding to the two connecting shafts 250. Each pedal 200 can be rotatably connected to the supporting column 100 by passing the connecting shaft 250 through the corresponding connecting hole.

[0062] Considering the reliability of the rotation connection between the pedal 200 and the support column 100, a spring may be sleeved outside the connecting shaft 250. The spring can fill and eliminate the gap between the pedal 200 and the support column 100 to avoid loosening during transportation.

[0063] A limiting component 400 is also provided between the pedal 200 and the support column 100. The limiting component 400 is used to limit the angle at which the pedal 200 is unfolded relative to the support column 100, so that the pedal 200 can be maintained in the unfolded position. Preferably, the limiting component 400 includes a first limiting block 410 and a second limiting block 420. The first limiting block 410 is provided on the support column 100, and the second limiting block 420 is provided on the pedal 200 corresponding to the first limiting block 410. The first limiting block 410 can abut against the second limiting block 420, so that the pedal 200 can be maintained in the unfolded position relative to the support column. By providing the first limiting block 410 and the second limiting block 420 that can abut against each other, the pedal 200 can be maintained in the unfolded position at a certain angle relative to the support column 100, so that the pedal 200 can be roughly level with the ground, which is convenient for the staff to get on and off the tank container.

[0064] The second stopper 420 in the present application can be selectively disposed at the end of any one or more pedals 200 to abut against the first stopper 410 at the corresponding position on the support column 100. For example, Figure 1 In the example shown, the second stopper 420 may be provided on the first pedal 200 near the top of the frame 102 and the last pedal 200 near the bottom of the frame 102. In addition, the second stopper 420 may be provided at the end of the aforementioned connecting shaft 250. After the connecting shaft 250 of the pedal 200 passes through the connecting hole of the supporting column 100, a block structure capable of abutting against the first stopper 410 is welded at the end of the connecting shaft 250, and the block structure is the second stopper 420. At the same time, the second stopper 420 also acts as a locking cap to prevent the connecting shaft 250 from slipping out of the connecting hole of the supporting column 100.

[0065] When the support column 100 is vertically arranged between the top and the bottom of the frame 102, the cooperation of the first limit block 410 and the second limit block 420 can enable the pedal 200 to be unfolded to an angle of approximately 90° relative to the support column 100, ensuring that the pedal 200 in the unfolded position can be parallel to the ground.

[0066] When the support column 100 is inclined at a certain angle to the vertical direction between the top and the bottom of the frame 102, the cooperation of the first limit block 410 and the second limit block 420 can enable the pedal 200 to be unfolded at a corresponding angle relative to the support column 100, thereby ensuring that the pedal 200 in the unfolded position can be parallel to the ground.

[0067] See also Figures 5 to 7As shown, the folding ladder 20 also includes a support assembly 500, which is detachably connected to the lower end of the support column 100. Specifically, the support assembly 500 can position the support column 100 at an inclined position set at an angle to the vertical direction. For example, when the folding ladder 20 is unfolded for use, the support column 100 can be positioned at an inclined position with an angle α of approximately 5°-15° to the vertical direction through the support assembly 500, so that the angle of the folding ladder 20 as a whole to the vertical direction is also 5°-15°, which is convenient for the staff to get on and off the tank container. At this time, the surfaces of the first limit block 410 and the second limit block 420 that cooperate with each other can be designed to be approximately 75°-85° with the vertical direction, so that the cooperation between the two can enable the pedal 200 to be unfolded at an angle of 75°-85° relative to the support column 100, so that the pedal 200 in the unfolded position can be approximately parallel to the ground, which is convenient for the staff to get on and off the tank container.

[0068] Specifically, the lower end of the support column 100 is fixedly connected with a positioning beam 120. The support assembly 500 includes a support rod 510, and a positioning slot 511 is formed on the support rod 510. The positioning slot 511 can be snapped on the positioning beam 120 to position the support column 100 in an inclined position. By setting the positioning beam 120 and the positioning slot 511 to snap together, the support column 100 can be positioned in an inclined position at a certain angle to the vertical direction, that is, the folding ladder 20 as a whole can also be in an inclined position at a certain angle to the vertical direction, so that it is more convenient for workers to get on and off the tank container.

[0069] like Figure 7 As shown, when the folding ladder 20 is not needed, the step 200 is folded relative to the support column 100, and the support column 100 and the handrail 300 can be locked by the support assembly 500, so that the folding ladder 20 is kept in the folded state. Specifically, the support assembly 500 also includes a spring pin 520, and the spring pin 520 is arranged at the end of the support rod 510. The support column 100 and the handrail 300 are respectively provided with pin holes corresponding to the spring pin 520. When the folding ladder 20 is stored, the support column 100 and the handrail 300 can be locked by passing the spring pin 520 through the pin hole on the support column 100 and the pin hole on the handrail 300.

[0070] See also Figure 1 and Figure 4 As shown, the handrail 300 is rotatably connected to the end of the front side portion 210 of the pedal 200. Preferably, the two ends of the front side portion 210 of each pedal 200 are respectively provided with a pin shaft 230, and the handrail 300 is provided with a connecting hole corresponding to the pin shaft 230, and the handrail 300 can be rotatably connected to the pedal 200 by passing the pin shaft 230 through the connecting hole.

[0071] Considering the reliability of the rotation connection between the pedal 200 and the handrail 300, a spring can be sleeved outside the pin 230. The spring can fill and eliminate the gap between the rotation connection between the pedal 200 and the handrail 300 to avoid loosening during transportation.

[0072] See also Figure 1 , a receiving groove 110 is formed on each supporting column 100 along its height direction, and the handrail rod 300 can be received in the receiving groove 110. Specifically, when the pedal 200 is in the folded position, each pedal 200 can be parallel to the height direction of the two supporting columns 100. At the same time, the handrail rod 300 can be folded and overlapped relative to each pedal 200 and received in the receiving groove 110 of the supporting column 100. Thereby, the overall width dimension of the folding ladder 20 can be avoided from being increased, so that the structure of the folding ladder 20 is more compact and the volume is smaller. In addition, the folding ladder 20 occupies a small space and is convenient for arranging the folding ladder 20 in the limited space of the tank container.

[0073] In some embodiments, the support column 100 may be made of angle steel, and the angle steel structure can form a receiving groove 110 for receiving the handrail 300, so that the support column 100 with the receiving groove 110 can be obtained without further processing. In other embodiments, the support column 100 may also be made of U-shaped channel steel.

[0074] Combination Figure 3 and Figure 4 As shown, the support column 100 is an angle steel structure with a substantially L-shaped cross section, the end of the rear side portion 220 of the pedal 200 is rotatably connected to a side plate of each support column 100, and the end of the front side portion 210 of the pedal 200 is rotatably connected to the handrail 300 through a pin 230. When the pedal 200 is in the folded position, the handrail 300 is accommodated in the receiving groove 110 of the support column 100, and the pedal 200 is folded and accommodated between the two support columns 100. In addition, the pedal 200 and the handrail 300 are respectively located on both sides of the side plate of the support column 100.

[0075] Preferably, the two ends of the front side portion 210 of the pedal 200 are respectively provided with connecting blocks 240, the pin shaft member 230 is fixed on the connecting block 240, and the connecting block 240 is provided with an avoidance groove 241 for avoiding the support column 100. In this example, the avoidance groove 241 is mainly used to avoid the side plate connected to the end of the support column 100 mentioned above. By providing the avoidance groove 241, it can be ensured that when the pedal 200 is folded relative to the support column 100, the pedal 200 and the handrail 300 can be relatively overlapped with the support column 100, avoiding interference between them so that the three cannot be completely folded and overlapped. Among them, the cross-sectional shape of the avoidance groove 241 can be U-shaped, L-shaped or V-shaped, etc., as long as it can achieve the purpose of avoiding mutual interference between the two when the pedal 200 is folded relative to the support column 100.

[0076] Embodiment 2

[0077] See also Figures 8 to 10 As shown, the difference between the second embodiment and the first embodiment is that the second embodiment uses only one supporting column 100 as the main support of the folding ladder 20 .

[0078] like Figure 8 As shown, there is one support column 100, and the support column 100 is rotatably connected to the middle part of the rear side portion 220 of each pedal 200. In this example, a hinge can be used between the support column 100 and the pedal 200 to achieve the rotatable connection between the two. Alternatively, the support column 100 and the pedal 200 can also be rotatably connected by a shaft-hole matching method.

[0079] Preferably, the limiting component 400 is a limiting hinge 430, and the two ends of the handrail rod 300 are rotatably connected to the top and bottom of the frame 102 respectively through the limiting hinge 400. The limiting hinge 430 includes a first chain body 431 and a second chain body 432, one end of the first chain body 431 is fixed to the frame 102, the other end of the first chain body 431 is hinged to one end of the second chain body 432, the other end of the second chain body 432 is hinged to the end of the handrail rod 300, and the second chain body 432 has a fixed expansion angle relative to the first chain body 431.

[0080] The second chain body 432 can have a fixed expansion angle relative to the first chain body 431 in the following manner: a limit plate 433 is formed at the end where the first chain body 431 and the second chain body 432 are connected, and when the second chain body 432 rotates a certain angle relative to the first chain body 431, the second chain body 432 and the limit plate 433 abut against each other, so that the second chain body 432 can be maintained at the expansion angle relative to the first chain body 431.

[0081] At this time, under the action of the first chain body 431 and the second chain body 432, the handrail 300 moves forward relative to the frame 102 to a position parallel to the support column 100 and spaced a certain distance apart. In this process, the pedal 200 follows the handrail 300 and can be unfolded to the unfolded position relative to the support column 100. At the same time, since the second chain body 432 can be maintained at the above-mentioned unfolding angle relative to the first chain body 431, the pedal 200 can also be maintained at the unfolded position.

[0082] The limit hinge 430 not only realizes the rotatable connection between the handrail 300 and the frame 102, but also enables the pedal 200 to be kept in the unfolded position relative to the support column 100. Thus, the pedal 200 can be kept in a state substantially horizontal to the ground, making it convenient for workers to get on and off the tank container.

[0083] In other embodiments, two limit blocks with corresponding positions may be respectively set on the support column 100 and the pedal 200. When the pedal 200 is unfolded to a certain extent relative to the support column 100, the two limit blocks can offset each other, so that the pedal 200 remains in the unfolded position relative to the support column.

[0084] The handrail 300 of the present application, such as Figure 8 As shown, in addition to being rotatably connected to each pedal 200, the two ends of the handrail 300 can also be rotatably connected to the top and bottom of the frame 102. This makes the structure of the folding ladder 20 more stable and reliable, and improves the safety of the staff.

[0085] Alternatively, see Figure 1 As shown, the handrail 300 can be rotatably connected to each pedal 200 in a suspended manner. That is, the handrail 300 is only rotatably connected to each pedal 200, and has no connection relationship with other components.

[0086] The folding ladder 20 of the present application has at least the advantages of small storage space, convenient storage, high safety and good comfort. The thickness of the folding ladder 20 after storage can be controlled by controlling the thickness of the support column 100 or the handrail 300 or the pedal 200. At the same time, the width of the pedal 200 of the folding ladder 20 can be widened as needed to facilitate the staff to get on and off the tank box and improve the comfort of the staff to get on and off the tank box. And when the folding ladder 20 is unfolded, the widened pedal 200 is distributed in a ladder shape, and the handrails 300 on both sides can make it safer for the staff to get on and off the tank box.

[0087] The above embodiments are merely exemplary descriptions of the structures. The structures in the embodiments are not fixed combination structures. In the absence of structural conflicts, the structures in multiple embodiments can be used in any combination.

[0088] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A folding ladder, arranged on the frame of a tank container, characterized in that: The folding ladder comprises: A support column connected between the top and the bottom of the frame; A plurality of pedals are arranged at intervals along the height direction of the support column, each of the pedals is rotatably connected to the support column, and has a folded position folded relative to the support column and an unfolded position arranged at an angle relative to the support column, and the folding ladder is also provided with a limiting component for limiting the unfolding angle of the pedal relative to the support column; and A handrail is rotatably connected to each of the pedals, and the handrail is rotatably connected to the support column on both sides of the pedal width direction; When the pedal is in the unfolded position, the handrail and the support column are arranged in parallel along the front-rear direction of the frame, and when the pedal is in the folded position, the handrail can overlap with each pedal.

2. The folding ladder according to claim 1, characterized in that: Each of the pedals has a front side and a rear side opposite to each other, the support column is rotatably connected to the rear side of the pedal, and the handrail is rotatably connected to the front side of the pedal.

3. The folding ladder according to claim 2, characterized in that: The number of the supporting columns is two, and the two supporting columns are rotatably connected to the two ends of the rear side portion of each pedal respectively, so that each pedal is rotatably connected between the two supporting columns.

4. The folding ladder according to claim 3, characterized in that: A receiving groove is formed on each of the supporting columns along its height direction, and the handrail rod can be received in the receiving groove.

5. The folding ladder according to claim 3, characterized in that: The two ends of the front side of the pedal are respectively provided with pin shafts, and the handrail rod is provided with connecting holes corresponding to the pin shafts. The handrail rod is inserted into the connecting holes through the pin shafts and can be rotatably connected with the pedal.

6. The folding ladder according to claim 5, characterized in that: The two ends of the front side of the pedal are respectively provided with connecting blocks, the pin shaft member is fixed on the connecting blocks, and the connecting blocks are provided with avoidance grooves for avoiding the supporting columns.

7. The folding ladder according to claim 3, characterized in that: The limiting component includes a first limiting block and a second limiting block, the first limiting block is arranged on the supporting column, the second limiting block is arranged on the pedal corresponding to the first limiting block, the first limiting block can be offset against the second limiting block to keep the pedal in the expanded position relative to the supporting column.

8. The folding ladder according to claim 2, characterized in that: The number of the supporting column is one, and the supporting column is rotatably connected to the middle part of the rear side of each pedal.

9. The folding ladder according to claim 8, characterized in that: The limiting component is a limiting hinge, and the two ends of the handrail rod are rotatably connected to the top and bottom of the frame respectively through the limiting hinge; The limit hinge includes a first chain body and a second chain body, one end of the first chain body is fixed to the frame, the other end of the first chain body is hinged to one end of the second chain body, the other end of the second chain body is hinged to the end of the handrail, the second chain body has a fixed expansion angle relative to the first chain body, and the pedal follows the handrail and can be maintained in the expanded position relative to the support column.

10. A tank container, comprising a tank body and a frame connected to the outside of the tank body, and a folding ladder arranged on the frame, characterized in that: The folding ladder is the folding ladder according to any one of claims 1 to 9, and the folding ladder is arranged at the end or both sides of the frame.

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