Turnover type stepping structure for heavy vehicle

Abstract

The invention belongs to the technical field of maintenance and repair of heavy vehicles, and relates to an overturning type stepping structure for a heavy vehicle. One end of the telescopic air cylinder (2) is movably connected with the angle-adjustable motor (1), the other end of the telescopic air cylinder (2) is movably connected with the first-stage pedal plate (7), one end of the connecting rod (6) is movably connected with the first-stage pedal plate (7), the other end of the connecting rod (6) is movably connected with the second-stage pedal plate (4), and the side support (5-3) is provided with an upper limiting block (5-4-1) and a lower limiting block (5-4-2). The overturning type stepping structure for the heavy vehicle is arranged between a cab rear wall and a chassis frame, or arranged between a vehicle door frame and the chassis frame, or arranged on a frame. The size of one side of the first-stage pedal (7) protruding out of the side portion of the side support (5-3) is larger than the size of the second-stage pedal (4) protruding out of the side portion of the side support (5-3). According to the overturning type stepping structure for the heavy vehicle, people can conveniently go up and down when the overturning type stepping structure is used, the maintenance requirement is met, the overturning type stepping structure can be conveniently folded when not used, and no extra space is occupied.

Description

Technical Field

[0001] The invention belongs to the technical field of heavy vehicle maintenance and repair, and more particularly relates to a flip-type step structure for heavy vehicles. Background Art

[0002] Because heavy-duty tractor drivers need to access the operating platform for maintenance and repair, as well as for connecting and disconnecting trailers, they typically do so using tires or steps welded onto special-shaped fuel tanks or LNG cylinders. This is unsafe and sacrifices tank or LNG cylinder space. Existing steps are often welded onto special-shaped tanks or LNG cylinders, resulting in a loss of tank capacity. Furthermore, the first and second steps are equal in width and arranged vertically, making entry and exit inconvenient.

[0003] In the prior art, there is a technology named "A Flipping Step" with a publication (announcement) number of "CN215436222U". This technology relates to a flipping step, including a step and a driving device. The driving device is a cylinder driving structure. The driving device is used to control the flipping of the step. The driving device includes a double-acting cylinder; the double-acting cylinder is equipped with two cylinder speed regulating valves, and the two cylinder speed regulating valves are respectively connected to the rod chamber and the rodless chamber of the double-acting cylinder; when the above-mentioned flipping step is flipped, the cylinder speed regulating valve is used to control the flow rate of the airflow out of the double-acting cylinder. In particular, when the above-mentioned center of gravity changes, the cylinder speed regulating valve can always maintain the stable operation of the double-acting cylinder piston rod, thereby making the step flip stably, ensuring stability and safety during use. However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a flip step structure for heavy vehicles is provided, which has a simple structure, reliable layout, is convenient for people to get on and off when in use, meets maintenance and repair needs, can be easily folded up when not in use, and does not take up extra space.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0006] The present invention relates to a flip step structure for heavy vehicles. A first-stage foot pedal and a second-stage foot pedal are movably connected to the side bracket of the supporting bracket. One end of the telescopic cylinder is movably connected to the angle-adjustable motor. The other end of the telescopic cylinder is movably connected to the first-stage foot pedal. One end of a connecting rod is movably connected to the first-stage foot pedal. The other end of the connecting rod is movably connected to the second-stage foot pedal. An upper limit block is provided near one side of the side bracket. A lower limit block is provided near the other side of the side bracket below the upper limit block. The flip step structure for heavy vehicles is provided between the rear wall of the cab and the chassis frame, or between the door frame and the chassis frame, or on the frame. The dimension of one side of the first-stage foot pedal protruding from the side of the side bracket is larger than the dimension of the second-stage foot pedal protruding from the side of the side bracket.

[0007] The support bracket includes a base, a motor mounting plate, two symmetrically arranged side brackets, and a step limit block group. The motor mounting plate is set on the protruding part of the base, and the two side brackets are arranged vertically on the base. Each foot pedal is respectively provided with a corresponding group of step limit block groups, and each group of step limit block groups respectively includes an upper limit block and a lower limit block.

[0008] A folding portion is provided on each side of the first-level foot pedal, and each folding portion is movably connected to the corresponding side bracket through a threaded pin shaft. The threaded portion with the threaded pin shaft is screwed through the threaded hole on the folding portion, and the smooth rod portion with the threaded pin shaft is movably passed through the connecting through hole on the side bracket.

[0009] A folding portion is provided on each side of the secondary foot pedal, and each folding portion is movably connected to the corresponding side bracket through a threaded pin shaft. The threaded portion with the threaded pin shaft is screwed through the threaded hole on the folding portion, and the smooth rod portion with the threaded pin shaft is movably passed through the connecting through hole on the side bracket.

[0010] The motor mounting plate comprises a horizontal portion and a vertical portion, the horizontal portion and the vertical portion are L-shaped structures, the horizontal portion is fixed on the base, and the adjustable angle motor is fixedly connected to the vertical portion of the motor mounting plate by bolts.

[0011] Anti-slip pads are provided on the first-level foot pedal and the second-level foot pedal.

[0012] The width of the first-level foot pedal is greater than the width of the second-level foot pedal.

[0013] When the first-level foot pedal is flipped and folded, one side of the upper part of the first-level foot pedal is attached to the side of the upper limit block, and one side of the lower part of the first-level foot pedal is attached to the side of the lower limit block. When the first-level foot pedal 7 is flipped and opened, one side of the upper part of the first-level foot pedal is attached to the lower part of the upper limit block, and one side of the lower part of the first-level foot pedal is attached to the upper part of the lower limit block.

[0014] When the secondary foot pedal is flipped and folded, one side of the upper part of the secondary foot pedal is attached to the side of the upper limit block, and one side of the lower part of the secondary foot pedal is attached to the side of the lower limit block. When the secondary foot pedal is flipped and opened, one side of the upper part of the secondary foot pedal is attached to the lower part of the upper limit block, and one side of the lower part of the secondary foot pedal is attached to the upper part of the lower limit block.

[0015] The horizontal cross-section of the side bracket of the support bracket is an L-shaped structure; connection holes are respectively provided at the connecting plate position on the upper part of each side bracket.

[0016] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0017] The present invention relates to a flip-type step structure for heavy-duty vehicles. When the structure is configured, a first-stage footrest and a second-stage footrest are movably connected to the side brackets of the support bracket. The support bracket is used for fixed connection to achieve a reliable layout of the entire structure. The side bracket is fixedly arranged to mount the first-stage footrest and the second-stage footrest. The first-stage footrest is located below the second-stage footrest, forming a two-stage structure. The first-stage footrest and the second-stage footrest can each rotatably rotate relative to the side bracket. A telescopic cylinder is movably connected to an adjustable angle motor at one end, and the first-stage footrest at the other end. When the adjustable angle motor is controlled to rotate in different directions, the telescopic cylinder can be driven to move in different directions, and the telescopic cylinder causes the first-stage footrest to flip relative to the support bracket. When the telescopic cylinder is moved to one side, it causes the first-stage footrest to flip and retract. At this time, the first-stage footrest is in a substantially vertical position, does not protrude, and does not occupy additional vehicle space. When the telescopic cylinder is moved to the other side, it causes the first-stage footrest to flip and open. The first-stage footrest is in a substantially horizontal position, which facilitates boarding and disembarking. One end of the connecting rod is movably connected to the first-level foot pedal, and the other end of the connecting rod is movably connected to the second-level foot pedal. When the first-level foot pedal flips, it can drive the second-level foot pedal to flip synchronously, thereby controlling multiple foot pedals through an adjustable angle motor. An upper limit block is set near one side of the side bracket, and a lower limit block is set near the other side of the side bracket below the upper limit block. Each foot pedal is respectively provided with a corresponding step limit block group. When the first-level foot pedal is flipped and retracted, one side of the upper part of the first-level foot pedal is attached to the side of the upper limit block, and one side of the lower part of the first-level foot pedal is attached to the side of the lower limit block to achieve the folding limit. When the first-level foot pedal is flipped and opened, one side of the upper part of the first-level foot pedal is attached to the lower part of the upper limit block, and one side of the lower part of the first-level foot pedal is attached to the upper part of the lower limit block to achieve support when opening, ensuring the reliability of the pedaling load. At the same time, when the secondary foot pedal is flipped and retracted, one side of the upper portion of the secondary foot pedal is attached to the side of the upper limit block, and one side of the lower portion of the secondary foot pedal is attached to the side of the lower limit block, thereby achieving the folding limit. When the secondary foot pedal is flipped and opened, one side of the upper portion of the secondary foot pedal is attached to the lower portion of the upper limit block, and one side of the lower portion of the secondary foot pedal is attached to the upper portion of the lower limit block, thereby achieving support when opening and ensuring the reliability of the stepping load. The flip-type step structure for heavy-duty vehicles is arranged between the rear wall of the cab and the chassis frame, or between the door frame and the chassis frame, or on the frame. The flip-type step structure for heavy-duty vehicles is a part of the heavy-duty vehicle and can be selectively arranged in different locations. The dimension of one side of the first-stage foot pedal protruding from the side of the side bracket is larger than the dimension of the second-stage foot pedal protruding from the side of the side bracket, thereby forming a staggered structure between the first-stage foot pedal and the second-stage foot pedal. Unlike the prior art, the width of the different-stage pedals is no longer the same and the side protrusions are the same. The pedal arrangement of the present invention facilitates people to get on and off.The provision of the flip-type step structure for heavy vehicles solves the problems of loss of fuel tank volume caused by welding steps to special-shaped fuel tanks or LNG cylinders and inconvenience in getting on and off caused by steps of equal width and vertical arrangement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following is a brief description of the contents and symbols in the drawings of this specification:

[0019] Figure 1 This is a schematic structural diagram of the flip-type step structure for heavy vehicles according to the present invention;

[0020] Figure 2 This is a schematic structural diagram of the flip-type step structure for heavy vehicles according to the present invention;

[0021] Figure 3 This is a schematic structural diagram of the flip-type step structure for heavy vehicles according to the present invention;

[0022] Figure 4 This is a schematic structural diagram of the flip-type step structure for heavy vehicles according to the present invention;

[0023] The marks in the accompanying drawings are: 1. Adjustable angle motor, 2. Telescopic cylinder, 3. Threaded pin, 4. Secondary foot pedal, 5. Support bracket, 5-1. Base, 5-2. Motor mounting plate, 5-3. Side bracket, 5-4. Step limit block group, 5-5. Connecting hole, 5-6. Connecting through hole, 6. Connecting rod, 7. First-level foot pedal; 7-1. Bending part. DETAILED DESCRIPTION

[0024] The following describes the embodiments with reference to the accompanying drawings to further explain in detail the specific embodiments of the present invention, such as the shapes, structures, mutual positions and connection relationships between the various components involved, the functions and working principles of the various components.

[0025] As attached Figure 1 -Attached Figure 4As shown, the present invention is a flip-type step structure for heavy vehicles. The side bracket 5-3 of the support bracket 5 is movably connected to the first-stage foot pedal 7 and the second-stage foot pedal 4. One end of the telescopic cylinder 2 is movably connected to the adjustable angle motor 1, and the other end of the telescopic cylinder 2 is movably connected to the first-stage foot pedal 7. One end of the connecting rod 6 is movably connected to the first-stage foot pedal 7, and the other end of the connecting rod 6 is movably connected to the second-stage foot pedal 4. An upper limit block 5-4-1 is provided near one side of the side bracket 5-3, and a lower limit block 5-4-2 is provided near the other side of the side bracket 5-3 below the upper limit block 5-4-1. The flip-type step structure for heavy vehicles is arranged between the rear wall of the cab and the chassis frame, or between the door frame and the chassis frame, or on the frame. The dimension of the first-stage foot pedal 7 protruding from the side of the side bracket 5-3 is larger than the dimension of the second-stage foot pedal 4 protruding from the side of the side bracket 5-3. The above structure proposes an improved technical solution to address the shortcomings of the existing technology. During structural configuration, the first and second pedals 7 and 4 are movably connected to the side brackets 5-3 of the support bracket 5. The support bracket 5 is used for fixed connection to achieve a reliable layout of the entire structure. The side brackets 5-3 are fixedly configured to mount the first and second pedals 7 and 4. The first pedal 7 is located below the second pedal 4, forming a two-stage structure. The first and second pedals 7 and 4 can each flexibly rotate relative to the side brackets 5-3. One end of the telescopic cylinder 2 is movably connected to the adjustable angle motor 1, and the other end of the telescopic cylinder 2 is movably connected to the first pedal 7. When the adjustable angle motor 1 is controlled to rotate in different directions, the telescopic cylinder 2 can be driven to move in different directions, and the telescopic cylinder 2 will cause the first pedal 7 to flip relative to the support bracket 5. When the telescopic cylinder 2 moves to one side, it drives the first-stage footrest 7 to flip and retract. At this time, the first-stage footrest 7 is in a basically vertical state, does not protrude, and does not take up extra space in the vehicle. When the telescopic cylinder 2 moves to the other side, it drives the first-stage footrest 7 to flip and open. The first-stage footrest 7 is in a basically horizontal state, which is convenient for relevant personnel to get on and off. One end of the connecting rod 6 is movably connected to the first-stage footrest 7, and the other end of the connecting rod 6 is movably connected to the second-stage footrest 4. When the first-stage footrest 7 flips, it can drive the second-stage footrest 4 to flip synchronously, thereby controlling multiple footrests through an adjustable angle motor 1. The side bracket 5-3 is provided with an upper limit block 5-4-1 near one side, and the side bracket 5-3 located below the upper limit block 5-4-1 is provided with a lower limit block 5-4-2 near the other side. Each footrest is provided with a corresponding 5-4 step limit block group.When the first-level foot pedal 7 is flipped and folded, one side of the upper part of the first-level foot pedal 7 is attached to the side of the upper limit block 5-4-1, and one side of the lower part of the first-level foot pedal 7 is attached to the side of the lower limit block 5-4-2, so as to achieve the folding limit. When the first-level foot pedal 7 is flipped and opened, one side of the upper part of the first-level foot pedal 7 is attached to the lower part of the upper limit block 5-4-1, and one side of the lower part of the first-level foot pedal 7 is attached to the upper part of the lower limit block 5-4-2, so as to achieve support when opening and ensure the reliability of stepping load. At the same time, when the secondary foot pedal 4 is flipped and folded, one side of the upper portion of the secondary foot pedal 4 is attached to the side of the upper limit block 5-4-1, and one side of the lower portion of the secondary foot pedal 4 is attached to the side of the lower limit block 5-4-2, thereby achieving the folding limit. When the secondary foot pedal 4 is flipped and opened, one side of the upper portion of the secondary foot pedal 4 is attached to the lower portion of the upper limit block 5-4-1, and one side of the lower portion of the secondary foot pedal 4 is attached to the upper portion of the lower limit block 5-4-2, thereby achieving support when opening and ensuring the reliability of the stepping load. The flip step structure for heavy-duty vehicles is arranged between the rear wall of the cab and the chassis frame, or between the door frame and the chassis frame, or on the frame. As a part of a heavy-duty vehicle, the flip step structure for heavy-duty vehicles can be selected to be arranged in different positions. The dimension of one side of the first-stage foot pedal 7 protruding from the side of the side bracket 5-3 is larger than the dimension of the second-stage foot pedal 4 protruding from the side of the side bracket 5-3, so a staggered structure is formed between the first-stage foot pedal 7 and the second-stage foot pedal 4. Unlike the prior art, the width of the different-stage pedals is no longer the same and the side protrusions are the same. The pedal arrangement of the present invention is convenient for people to get on and off. After the described flip-type step structure for heavy vehicles is set up, the problems of loss of tank volume caused by welding pedals of special-shaped fuel tanks or LNG cylinders and the inconvenience of getting on and off caused by the equal width and vertical arrangement of the steps are solved. The flip-type step structure for heavy vehicles described in the present invention has a simple structure and a reliable arrangement. It is convenient for people to get on and off when in use, meets maintenance and repair requirements, and can be easily folded up when not in use without taking up extra space.

[0026] The support bracket 5 includes a base 5-1, a motor mounting plate 5-2, two symmetrically arranged side brackets 5-3, and a step limit block group 5-4. The motor mounting plate 5-2 is provided on the protruding portion of the base 5-1. The two side brackets 5-3 are vertically arranged on the base 5-1. Each pedal is provided with a corresponding set of step limit block groups 5-4. Each set of step limit block groups 5-4 includes an upper limit block 5-4-1 and a lower limit block 5-4-2. In the above structure, the base 5-1 and the motor mounting plate 5-2 and the two symmetrically arranged side brackets 5-3 are fixedly connected, which can be welded or bolted. The step limit block group 5-4 and the side bracket 5-3 are fixedly connected, which can be welded or bolted. Each footrest is provided at a corresponding position on each side bracket 5-3. Each set of step stopper blocks 5-4 includes an upper stopper block 5-4-1 and a lower stopper block 5-4-2, which are arranged vertically and staggered. This ensures that the step stopper blocks 5-4 do not affect the normal rotation of the footrests. Once the corresponding footrest has been rotated to its corresponding position, the step stopper blocks 5-4 can reliably limit the footrests.

[0027] Each side of the first-stage footrest 7 is provided with a hem 7-1. Each hem 7-1 is movably connected to a corresponding side bracket 5-3 via a threaded pin 3. The threaded portion of the threaded pin 5-3 is screwed through a threaded hole in the hem 7-1, and the smooth rod portion of the threaded pin 3 is movably passed through a connecting hole in the side bracket 5-3. With the above structure, each hem 7-1 on the first-stage footrest 7 is connected to a corresponding side bracket 5-3, achieving a reliable and flexible connection.

[0028] Each side of the secondary footrest 4 is provided with a hem 7-1. Each hem 7-1 is movably connected to a corresponding side bracket 5-3 via a threaded pin 3. The threaded portion of the threaded pin 3 is screwed through a threaded hole in the hem 7-1, and the smooth rod portion of the threaded pin 3 is movably inserted through a connecting hole 5-6 in the side bracket 5-3. With this structure, each hem 7-1 on the secondary footrest 4 is connected to a corresponding side bracket 5-3, achieving a reliable and flexible connection.

[0029] The motor mounting plate 5-2 comprises a horizontal portion and a vertical portion, forming an L-shaped structure. The horizontal portion is fixed to the base 5-1, and the adjustable angle motor 1 is fixedly connected to the vertical portion of the motor mounting plate 5-2 via bolts. With this structure, the motor mounting plate 5-2 is securely connected to the base and securely fixed to the adjustable angle motor 1.

[0030] Anti-skid pads are provided on the first-stage footrest 7 and the second-stage footrest 4. With the above structure, the anti-skid pads have good friction and effectively play a protective role, protecting the safety of personnel when stepping up and down.

[0031] The width of the first-stage footrest 7 is greater than that of the second-stage footrest 4. This structure allows the first-stage footrest to project larger than the second-stage footrest, creating a staggered structure between the first-stage and second-stage footrest brackets, with unequal upper and lower sides, enhancing ease of boarding and exiting. The number of footrests can be increased as needed, with the lower footrest projecting larger than the upper footrest.

[0032] When the first-stage footrest 7 is flipped and folded, the upper side of the first-stage footrest 7 is attached to the side of the upper limit block 5-4-1, and the lower side of the first-stage footrest 7 is attached to the side of the lower limit block 5-4-2. When the first-stage footrest 7 is flipped and opened, the upper side of the first-stage footrest 7 is attached to the lower part of the upper limit block 5-4-1, and the lower side of the first-stage footrest 7 is attached to the upper part of the lower limit block 5-4-2. When the second-stage footrest 4 is flipped and folded, the upper side of the second-stage footrest 4 is attached to the side of the upper limit block 5-4-1, and the lower side of the second-stage footrest 4 is attached to the side of the lower limit block 5-4-2. When the second-stage footrest 4 is flipped and opened, the upper side of the second-stage footrest 4 is attached to the lower part of the upper limit block 5-4-1, and the lower side of the second-stage footrest 4 is attached to the upper part of the lower limit block 5-4-2. With the above structure, the first-stage footrest and the second-stage footrest operate in tandem. According to actual needs, the pedals can be folded and opened to meet the needs of people getting on and off.

[0033] The side brackets 5-3 of the support bracket 5 have an L-shaped horizontal cross-section. Connecting holes 5-5 are provided at the connecting plate locations on the upper portion of each side bracket 5-3. This L-shaped horizontal cross-section of the side brackets 5-3 ensures overall strength. The connecting holes 5-5 provide for secure connection between the side brackets 5-3 and corresponding panels or brackets on the vehicle.

[0034] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A flip-type step structure for heavy vehicles, characterized by: The side bracket (5-3) of the support bracket (5) is movably connected to a first-stage foot pedal (7) and a second-stage foot pedal (4); one end of the telescopic cylinder (2) is movably connected to an angle-adjustable motor (1); the other end of the telescopic cylinder (2) is movably connected to the first-stage foot pedal (7); one end of a connecting rod (6) is movably connected to the first-stage foot pedal (7); the other end of the connecting rod (6) is movably connected to the second-stage foot pedal (4); an upper limit block (5-4-1) is provided near one side of the side bracket (5-3); a lower limit block (5-4-2) is provided near the other side of the side bracket (5-3) located below the upper limit block (5-4-1); and the flip-type step structure for heavy vehicles is provided between the rear enclosure of the cab and the chassis frame, or between the door frame and the chassis frame, or on the frame; the dimension of one side of the first-stage foot pedal (7) protruding from the side of the side bracket (5-3) is larger than the dimension of the second-stage foot pedal (4) protruding from the side of the side bracket (5-3).

2. The flip-type step structure for heavy vehicles according to claim 1, characterized in that: The support bracket (5) comprises a base (5-1), a motor mounting plate (5-2), two symmetrically arranged side brackets (5-3), and a step limit block group (5-4). The motor mounting plate (5-2) is provided on a protruding portion of the base (5-1). The two side brackets (5-3) are vertically arranged on the base (5-1). Each pedal is provided with a corresponding step limit block group (5-4). Each step limit block group (5-4) comprises an upper limit block (5-4-1) and a lower limit block (5-4-2).

3. The flip-type step structure for heavy vehicles according to claim 1 or 2, characterized in that: A folding portion (7-1) is provided on each side of the first-stage footrest (7), and each folding portion (7-1) is movably connected to a corresponding side bracket (5-3) via a threaded pin shaft (3). The threaded portion of the threaded pin shaft (5-3) is screwed through a threaded hole on the folding portion (7-1), and the smooth rod portion of the threaded pin shaft (3) is movably passed through a connecting through hole on the side bracket (5-3).

4. The flip-type step structure for heavy vehicles according to claim 3, characterized in that: A folding portion (7-1) is provided on each side of the secondary footrest (4), and each folding portion (7-1) is movably connected to a corresponding side bracket (5-3) via a threaded pin shaft (3), the threaded portion of the threaded pin shaft (3) is screwed through a threaded hole on the folding portion (7-1), and the smooth rod portion of the threaded pin shaft (3) is movably passed through a connecting through hole (5-6) on the side bracket (5-3).

5. The flip-type step structure for heavy vehicles according to claim 1 or 2, characterized in that: The motor mounting plate (5-2) comprises a horizontal portion and a vertical portion, the horizontal portion and the vertical portion are in an L-shaped structure, the horizontal portion is fixed on the base (5-1), and the adjustable angle motor (1) is fixedly connected to the vertical portion of the motor mounting plate (5-2) by bolts.

6. The flip-type step structure for heavy vehicles according to claim 4, characterized in that: Anti-slip pads are provided on the first-level foot pedal (7) and the second-level foot pedal (4).

7. The flip-type step structure for heavy vehicles according to claim 1 or 2, characterized in that: The width of the first-stage foot pedal (7) is greater than the width of the second-stage foot pedal (4).

8. The flip-type step structure for heavy vehicles according to claim 2, characterized in that: When the first-stage foot pedal (7) is turned over and folded, one side of the upper portion of the first-stage foot pedal (7) is attached to the side of the upper limit block (5-4-1), and one side of the lower portion of the first-stage foot pedal (7) is attached to the side of the lower limit block (5-4-2); when the first-stage foot pedal (7) is turned over and opened, one side of the upper portion of the first-stage foot pedal (7) is attached to the lower portion of the upper limit block (5-4-1), and one side of the lower portion of the first-stage foot pedal (7) is attached to the upper portion of the lower limit block (5-4-2).

9. The flip-type step structure for heavy vehicles according to claim 2, characterized in that: When the secondary foot pedal (4) is flipped and folded, one side of the upper portion of the secondary foot pedal (4) is attached to the side of the upper limit block (5-4-1), and one side of the lower portion of the secondary foot pedal (4) is attached to the side of the lower limit block (5-4-2); when the secondary foot pedal (4) is flipped and opened, one side of the upper portion of the secondary foot pedal (4) is attached to the lower portion of the upper limit block (5-4-1), and one side of the lower portion of the secondary foot pedal (4) is attached to the upper portion of the lower limit block (5-4-2).

10. The flip-type step structure for heavy vehicles according to claim 1 or 2, characterized in that: The side brackets (5-3) of the support bracket (5) have an L-shaped horizontal cross-section; connection holes (5-5) are respectively provided at the connection plate positions on the upper part of each side bracket (5-3).

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