Lifting folding type working platform and using method thereof

Abstract

The invention provides a lifting folding type operation platform and a using method thereof. A sliding sleeve is connected to a fixed cylinder in a sleeving mode, and a jacking device in the fixed cylinder can jack the sliding sleeve; the lower end of the fixed cylinder is connected with the movable base, a plurality of supporting rods are evenly hinged to the periphery of the top of the sliding sleeve, the sliding sleeve is sleeved with a sliding unfolding ring, a plurality of inclined supporting rods are evenly arranged on the periphery of the sliding unfolding ring, one end of each inclined supporting rod is hinged to the sliding unfolding ring, and the other end of each inclined supporting rod is hinged to a rod body of the corresponding supporting rod. The jacking equipment is connected with the sliding unfolding ring; the bearing table is arranged above the supporting rods to form a working platform, and at least one telescopic ladder stand is further arranged below the bearing table. The folding lifting type platform can be used for climbing operation in an open space, can also be used for climbing operation in a narrow space, not only can be used for climbing operation related to a power station, but also can be used for climbing operation in other industries.

Description

Technical Field

[0001] The invention relates to the field of aerial work platforms, and in particular to a lifting and folding work platform and a use method thereof. Background Art

[0002] In the past, when repairing the relevant parts of the turbine generator set in a narrow space, ladders were generally used to complete the relevant climbing work because there was no space required to set up a working platform. Since the ladder did not have a corresponding working platform, it was inconvenient for construction work. At the same time, due to the limited size and height of the ladder, the ladder was often not easy to fix securely, and there was a risk of slipping and falling from a height. In order to eliminate the risks or problems of using ladders for climbing work, and at the same time eliminate the space or conditions required for setting up ordinary platforms, and effectively solve the technical problems of climbing work and setting up working platforms in narrow spaces, and ensure the safe, efficient and convenient completion of climbing work in narrow spaces of turbine generator sets and other fields, it is necessary to design a working platform that is easy to operate, occupies a small space, and can be raised and lowered and folded. Summary of the invention

[0003] The main purpose of the present invention is to provide a lifting and folding work platform and a method of using the same, so as to solve the problems of high-altitude work and work platform erection in a narrow space.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a lifting and folding work platform, a sliding sleeve is sleeved on the fixed cylinder, and a lifting device inside the fixed cylinder can lift the sliding sleeve; The lower end of the fixed cylinder is connected to the mobile base, a plurality of support rods are evenly hinged around the top of the sliding sleeve, a sliding expansion ring is sleeved on the sliding sleeve, a plurality of diagonal support rods are evenly arranged around the sliding expansion ring, one end of the diagonal support rod is hinged to the sliding expansion ring, and the other end is hinged to the rod body of the support rod, a lifting device is provided on the sliding sleeve, and the lifting device is connected to the sliding expansion ring; The bearing platform is arranged above the supporting rod to form a working platform, and at least one telescopic ladder is arranged below the bearing platform.

[0005] In a preferred embodiment, the interior of the sliding deployment ring is connected to the sliding frame, a plurality of sliding grooves are provided on the sliding sleeve, and the sliding frame is slidably connected to the sliding grooves.

[0006] In the preferred embodiment, a second telescopic cylinder is provided inside the sliding sleeve, the rod body of the second telescopic cylinder is fixedly connected to the bottom of the sliding sleeve, and the telescopic rod of the second telescopic cylinder is connected to the sliding frame; The second telescopic cylinder drives the sliding unfolding ring to drive the supporting rod to fold or unfold.

[0007] In a preferred embodiment, a first telescopic cylinder is further provided inside the fixed cylinder, and a telescopic rod of the first telescopic cylinder is connected to the bottom of the sliding sleeve.

[0008] In the preferred embodiment, multiple clamping holes are provided on both sides of the support rod, and the support platform includes multiple fan-shaped assembly plates, and pin rods are provided on both sides of the lower surface of the assembly plate. The pin rods of the assembly plate are inserted into the clamping holes of the support rod to form the working platform surface.

[0009] In the preferred embodiment, a fixed guardrail is further provided on the bearing platform, an arc-shaped folding plate is provided on the assembly plate of the outer ring of the bearing platform, a plurality of insertion holes are provided inside the folding plate, and the lower end of the fixed guardrail is stuck in the insertion hole.

[0010] In the preferred embodiment, a lifting guardrail is further provided above the fixed guardrail, the rod body of the lifting guardrail is sleeved with the rod body of the fixed guardrail, a nut is provided on the fixed guardrail, the nut passes through the fixed guardrail and abuts against the lifting guardrail to fix the position of the lifting guardrail.

[0011] In the preferred embodiment, the upper end of the telescopic ladder is hinged to the bearing platform through a hinge seat, and the hinge seat is connected to the assembly plate of the bearing platform by a clamp or a nut; A supporting foot is also provided at the lower end of the telescopic ladder, and a supporting foot rod body is threadedly connected to the lower end of the telescopic ladder.

[0012] In the preferred embodiment, a plurality of moving wheels are provided below the fixed cylinder, and the moving wheels are universal self-locking moving wheels.

[0013] The method includes: S1, in the initial state, the support rod is in a folded state, the second telescopic cylinder is started, the second telescopic cylinder lifts the sliding deployment ring, the sliding deployment ring moves upward, and the sliding deployment ring pushes the multiple support rods to unfold and form a flat state; S2, installing an assembly plate on the support rod on the ground, and clamping the pins of multiple assembly plates in the clamping holes to form a bearing platform with a circular structure; S3. Install a telescopic ladder on the lower surface of the assembly plate. The hinged seat of the telescopic ladder is fixed to the lower surface of the assembly plate through a nut. The fixed guardrail is moved to the top of the bearing platform through the telescopic ladder, and the fixed guardrail is clamped in the socket of the bearing platform. S5, start the first telescopic cylinder, start lifting the sliding sleeve, and the sliding sleeve lifts the bearing platform to the construction position; S4. The supporting foot at the lower end of the telescopic ladder is fixed against the ground, and the moving wheels of the moving base are fixed; S5. After the construction is completed, the personnel dismantle the fixed guardrail and the lifting guardrail, and the personnel go down to the ground from the telescopic ladder. The first telescopic cylinder returns to its position, and the bearing platform descends to the height of the detachable bearing platform, and the assembly plate and the telescopic ladder are completely dismantled; S6. After the assembly plate is disassembled, the second telescopic cylinder begins to contract to drive the sliding deployment ring to descend, and the sliding deployment ring drives multiple support rods to contract and fold to the fixed cylinder position, completing the folding of the work platform.

[0014] The present invention provides a lifting and folding working platform and a method for using the same. The platform is foldable and has adjustable height, which can minimize its external dimensions and is easy to operate and install. The platform can be applied to high-altitude operations in various working environments, especially high-altitude operations in narrow spaces.

[0015] The platform is firmly fixed, easy to operate and move, and flexible to use. Only a few parts need to be installed on site, and most parts do not need to be installed on site. Therefore, it can be installed and used in a small space or complex environment. The platform height and position can be adjusted at any time according to the on-site construction requirements, and the platform size can also be selected according to the on-site requirements, so related climbing operations in a small space can be completed safely, efficiently and conveniently.

[0016] This platform not only eliminates the problems of using ladders to climb in narrow spaces or special environments, but also eliminates the problems of ordinary work platforms, and effectively solves the technical difficulties of setting up work platforms in narrow spaces and climbing operations. It can be promoted and applied to the maintenance of hydro-generators, and can also be promoted and applied to construction operations in other special environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is the overall appearance structure diagram of the present invention; Figure 2 This is a structural diagram of the lower surface of the foldable working platform of the present invention; Figure 3 This is a disassembled structural diagram of the foldable work platform of the present invention; Figure 4 This is a front and cross-sectional structural diagram of the foldable work platform of the present invention; Figure 5 This is a disassembled structural diagram of the carrier platform of the present invention; Figure 6 This is a structural diagram of the internal layout of the fixed cylinder of the present invention; Figure 7 It is a structural diagram of the installation of the sliding deployment ring of the present invention.

[0018] In the figure: lifting guardrail 1; fixed guardrail 2; bearing platform 3; assembly plate 301; socket 302; pin rod 303; telescopic ladder 4; supporting foot 401; fixed cylinder 5; movable base 6; movable wheel 7; sliding sleeve 8; slide groove 801; sliding deployment ring 9; sliding frame 901; diagonal support rod 10; support rod 11; clamping hole 1101; first telescopic cylinder 12; second telescopic cylinder 13. DETAILED DESCRIPTION

[0019] Example 1 like Figures 1 to 7As shown, a lifting and folding work platform, a sliding sleeve 8 is sleeved on a fixed cylinder 5, and a lifting device inside the fixed cylinder 5 can lift the sliding sleeve 8; The lower end of the fixed cylinder 5 is connected to the mobile base 6, and a plurality of support rods 11 are evenly hinged around the top of the sliding sleeve 8. A sliding deployment ring 9 is sleeved on the sliding sleeve 8, and a plurality of diagonal support rods 10 are evenly arranged around the sliding deployment ring 9. One end of the diagonal support rod 10 is hinged to the sliding deployment ring 9, and the other end is hinged to the rod body of the support rod 11. A lifting device is provided on the sliding sleeve 8, and the lifting device is connected to the sliding deployment ring 9. The bearing platform 3 is arranged above the support rod 11 to form a working platform, and at least one telescopic ladder 4 is also arranged below the bearing platform 3 .

[0020] The fixed cylinder 5 can also lift the sliding sleeve 8 to increase the construction height. The lifting equipment can also lift the sliding deployment ring 9. The sliding deployment ring 9 lifts the expanded or folded support rod 11, similar to an umbrella-like structure. The assembly plate 301 is installed on the expanded and waiting support rod 11 to form a bearing platform 3 to form a working platform. After disassembling the assembly plate 301, the support rod 11 can be folded for storage and movement.

[0021] The lifting device inside the fixed cylinder 5 can lift the sliding sleeve 8, thereby adjusting the height of the entire working platform. The lifting device on the sliding sleeve 8 is connected to the sliding deployment ring 9 to control the lifting and lowering of the sliding deployment ring 9, thereby controlling the expansion or folding of the support rod 11.

[0022] When the sliding deployment ring 9 is lifted, the diagonal brace 10 and the support rod 11 are unfolded, similar to the opening process of an umbrella. When the sliding deployment ring 9 is lowered, the diagonal brace 10 and the support rod 11 are folded, and the platform is retracted for easy movement or storage.

[0023] The assembly plate 301 is installed on the unfolded support rod 11 to form a bearing platform 3 to provide a working space.

[0024] When not in use, the assembly plate 301 can be disassembled so that the support rod 11 can be folded to reduce the occupied space.

[0025] In a preferred embodiment, the interior of the sliding deployment ring 9 is connected to the sliding frame 901 , a plurality of sliding grooves 801 are provided on the sliding sleeve 8 , and the sliding frame 901 is slidably connected to the sliding grooves 801 .

[0026] A second telescopic cylinder 13 is provided inside the sliding sleeve 8, the rod body of the second telescopic cylinder 13 is fixedly connected to the bottom of the sliding sleeve 8, and the telescopic rod of the second telescopic cylinder 13 is connected to the sliding frame 901; The second telescopic cylinder 13 drives the sliding deployment ring 9 to fold or unfold the support rod 11. The sliding frame 901 is connected to the inside of the sliding deployment ring 9, and the sliding frame 901 slides along the sliding groove 801 on the sliding sleeve 8. This design ensures that the sliding deployment ring 9 can move up and down smoothly.

[0027] The second telescopic cylinder 13 is arranged inside the sliding sleeve 8 , and its telescopic rod is connected to the sliding frame 901 .

[0028] When the telescopic rod of the second telescopic cylinder 13 is extended, it pushes the sliding frame 901 to move upward, thereby driving the sliding deployment ring 9 to rise.

[0029] When the sliding deployment ring 9 rises, the support rods 11 are pushed to be deployed through the diagonal support rods 10 to form a support structure of the working platform.

[0030] When the telescopic rod of the second telescopic cylinder 13 is retracted, the sliding frame 901 moves downward, the sliding deployment ring 9 descends accordingly, the support rod 11 is folded, and the platform is retracted.

[0031] The sliding frame 901 and the second telescopic cylinder 13 are arranged inside the sliding sleeve 8, so that the overall structure is more compact and does not occupy extra space.

[0032] The sliding connection between the sliding frame 901 and the sliding groove 801 makes the movement of the sliding deployment ring 9 smoother and the deployment and folding of the support rod 11 more convenient.

[0033] The driving mode of the second telescopic cylinder 13 provides stable power support for the sliding deployment ring 9, ensuring the safety of the working platform when it is deployed and folded.

[0034] In the preferred embodiment, a first telescopic cylinder 12 is further provided inside the fixed cylinder 5, and a telescopic rod of the first telescopic cylinder 12 is connected to the bottom of the sliding sleeve 8. The first telescopic cylinder 12 drives the sliding sleeve 8 to lift up.

[0035] The telescopic rod of the first telescopic cylinder 12 is connected to the bottom of the sliding sleeve 8. When the telescopic rod of the first telescopic cylinder 12 is extended, the sliding sleeve 8 is pushed up to achieve height adjustment of the entire working platform.

[0036] In the preferred embodiment, multiple clamping holes 1101 are provided on both sides of the support rod 11, and the supporting platform 3 includes multiple assembly plates 301 with fan-shaped structures. Pin rods 303 are provided on both sides of the lower surface of the assembly plate 301. The pin rods 303 of the assembly plate 301 are inserted into the clamping holes 1101 of the support rod 11 to form the working platform surface.

[0037] Insert the pin rod 303 of the assembly plate 301 into the clamping hole 1101 of the support rod 11 to complete the connection between the assembly plate and the support rod.

[0038] In this way, multiple assembly plates 301 can be firmly connected to the support rods 11 to form a continuous working platform surface.

[0039] In the preferred embodiment, a fixed guardrail 2 is also provided on the supporting platform 3 , and an arc-shaped folding plate is provided on the assembly plate 301 of the outer circle of the supporting platform 3 , and a plurality of insertion holes 302 are provided inside the folding plate, and the lower end of the fixed guardrail 2 is stuck in the insertion hole 302 .

[0040] The arc-shaped folded plate is arranged along the outer edge of the bearing platform 3 to provide a mounting point for the fixed guardrail 2 .

[0041] The lower end of the fixed guardrail 2 is designed with a structure that can be inserted into the holes 302 inside the arc-shaped folded plate. By inserting the lower end of the guardrail into these holes, the guardrail is fixed to the periphery of the supporting platform 3, thereby forming a safe working environment.

[0042] In the preferred embodiment, a lifting guardrail 1 is further provided above the fixed guardrail 2, and the rod of the lifting guardrail 1 is sleeved with the rod of the fixed guardrail 2. A nut is provided on the fixed guardrail 2, and the nut passes through the fixed guardrail 2 and abuts against the lifting guardrail 1 to fix the position of the lifting guardrail 1. According to the safety requirements of the working environment, the rod of the lifting guardrail 1 is sleeved on the rod of the fixed guardrail 2 to increase the total height of the protective guardrail. The lifting guardrail 1 is adjusted to a suitable position by adjusting its height.

[0043] The nut on the fixed guardrail 2 is passed through its rod body, pressed against and fixed on the rod body of the lifting guardrail 1, so as to ensure the stable position of the lifting guardrail 1 and prevent it from accidentally sliding or falling off.

[0044] In the preferred embodiment, the upper end of the telescopic ladder 4 is hinged to the load-bearing platform 3 through a hinge seat, and the hinge seat is clamped or connected to the assembly plate 301 of the load-bearing platform 3 through a nut; A supporting foot 401 is also provided at the lower end of the telescopic ladder 4 , and a rod body of the supporting foot 401 is threadedly connected to the lower end of the telescopic ladder 4 .

[0045] The upper end of the telescopic ladder 4 is connected to the assembly plate 301 of the bearing platform 3 through a hinge seat, and can be fixed by a clamp or a nut. According to the height of the working platform, the height of the supporting foot 401 is adjusted to ensure that the ladder is stably supported on the ground. When the working platform needs to be moved, the telescopic ladder 4 can be folded up to reduce the size and facilitate transportation.

[0046] According to the needs of operators going up and down the working platform, the telescopic ladder 4 can be extended to a suitable length.

[0047] This design enables the telescopic ladder 4 to not only provide a convenient passage, but also increase the adaptability and portability of the working platform, making it suitable for use in a variety of working environments.

[0048] In the preferred embodiment, a plurality of moving wheels 7 are provided below the fixed cylinder 5, and the moving wheels 7 are universal self-locking moving wheels. The moving wheels 7 can rotate freely, allowing the working platform to move in multiple directions without being restricted by a fixed direction. This allows the platform to be easily adjusted in different positions and directions to adapt to different working environments.

[0049] The self-locking travel wheels 7 can lock the wheels when the work platform needs to be fixed to prevent the platform from moving accidentally. This feature is essential to ensure safety during work, especially when using it on uneven or sloping ground.

[0050] The work platform equipped with the moving wheels 7 can be easily moved from one work area to another, thereby reducing the need for manual handling and improving work efficiency.

[0051] Example 2 Further illustrate with reference to Example 1, Figure 1-7 In the structure shown, S1, in the initial state, the support rod 11 is in a folded state, the second telescopic cylinder 13 is started, the second telescopic cylinder 13 lifts the sliding deployment ring 9, the sliding deployment ring 9 moves upward, and the sliding deployment ring 9 pushes the multiple support rods 11 to expand into a flat state; S2, installing the assembly plate 301 on the support rod 11 on the ground, and the pin rods 303 of the plurality of assembly plates 301 are clamped in the clamping holes 1101 to form a bearing platform 3 with a circular structure; S3, install the telescopic ladder 4 on the lower surface of the assembly plate 301, the hinge seat of the telescopic ladder 4 is fixed to the lower surface of the assembly plate 301 by nuts, and the fixed guardrail 2 is moved to the top of the bearing platform 3 by the telescopic ladder 4, and the fixed guardrail 2 is clamped in the socket 302 of the bearing platform 3; S5, start the first telescopic cylinder 12, start lifting the sliding sleeve 8, and the sliding sleeve 8 lifts the bearing platform 3 to the construction position; S4, the support foot 401 at the lower end of the telescopic ladder 4 is fixed against the ground, fixing the moving wheel 7 of the moving base 6; S5. After the construction is completed, the personnel dismantle the fixed guardrail 2 and the lifting guardrail 1, and the personnel go down to the ground from the telescopic ladder 4. The first telescopic cylinder 12 returns to its position, and the bearing platform 3 descends to the height of the detachable bearing platform 3, and the assembly plate 301 and the telescopic ladder 4 are completely dismantled; S6. After the assembly plate 301 is disassembled, the second telescopic cylinder 13 starts to contract to drive the sliding deployment ring 9 to descend, and the sliding deployment ring 9 drives the multiple support rods 11 to contract and fold to the position of the fixed cylinder 5, completing the folding of the working platform.

[0052] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A lifting and folding working platform, characterized by: A sliding sleeve (8) is sleeved on the fixed cylinder (5), and a lifting device inside the fixed cylinder (5) can lift the sliding sleeve (8); The lower end of the fixed cylinder (5) is connected to the movable base (6); a plurality of support rods (11) are evenly hinged around the top of the sliding sleeve (8); a sliding deployment ring (9) is sleeved on the sliding sleeve (8); a plurality of diagonal support rods (10) are evenly arranged around the sliding deployment ring (9); one end of the diagonal support rod (10) is hinged to the sliding deployment ring (9), and the other end is hinged to the rod body of the support rod (11); a lifting device is provided on the sliding sleeve (8), and the lifting device is connected to the sliding deployment ring (9); The bearing platform (3) is arranged above the support rod (11) to form a working platform, and at least one telescopic ladder (4) is also arranged below the bearing platform (3).

2. The lifting and folding working platform according to claim 1 is characterized in that: The interior of the sliding deployment ring (9) is connected to the sliding frame (901), a plurality of sliding grooves (801) are provided on the sliding sleeve (8), and the sliding frame (901) is slidably connected to the sliding grooves (801).

3. The lifting and folding working platform according to claim 2 is characterized in that: A second telescopic cylinder (13) is provided inside the sliding sleeve (8); a rod body of the second telescopic cylinder (13) is fixedly connected to the bottom of the sliding sleeve (8); and a telescopic rod of the second telescopic cylinder (13) is connected to the sliding frame (901); The second telescopic cylinder (13) drives the sliding unfolding ring (9) to drive the support rod (11) to fold or unfold.

4. The lifting and folding working platform according to claim 1 is characterized in that: A first telescopic cylinder (12) is also provided inside the fixed cylinder (5), and a telescopic rod of the first telescopic cylinder (12) is connected to the bottom of the sliding sleeve (8).

5. The lifting and folding working platform according to claim 1 is characterized in that: A plurality of clamping holes (1101) are provided on both sides of the support rod (11), the support platform (3) comprises a plurality of assembly plates (301) of fan-shaped structures, pin rods (303) are provided on both sides of the lower surface of the assembly plates (301), and the pin rods (303) of the assembly plates (301) are inserted into the clamping holes (1101) of the support rod (11) to form a working platform surface.

6. The lifting and folding working platform according to claim 5 is characterized in that: A fixed guardrail (2) is also provided on the bearing platform (3), and an arc-shaped folding plate is provided on the assembly plate (301) of the outer ring of the bearing platform (3). A plurality of insertion holes (302) are provided inside the folding plate, and the lower end of the fixed guardrail (2) is clamped in the insertion hole (302).

7. The lifting and folding working platform according to claim 6 is characterized in that: A lifting guardrail (1) is also provided above the fixed guardrail (2); a rod body of the lifting guardrail (1) is sleeved with a rod body of the fixed guardrail (2); a nut is provided on the fixed guardrail (2); the nut passes through the fixed guardrail (2) and abuts against the lifting guardrail (1) to fix the position of the lifting guardrail (1).

8. The lifting and folding working platform according to claim 1 is characterized in that: The upper end of the telescopic ladder (4) is hinged to the bearing platform (3) via a hinge seat, and the hinge seat is snap-fitted to an assembly plate (301) of the bearing platform (3) or connected via a nut; A supporting foot (401) is also provided at the lower end of the telescopic ladder (4), and a rod body of the supporting foot (401) is threadedly connected to the lower end of the telescopic ladder (4).

9. The lifting and folding working platform according to claim 1 is characterized in that: A plurality of moving wheels (7) are also provided below the fixed cylinder (5), and the moving wheels (7) are universal self-locking moving wheels.

10. A method for using a lifting and folding working platform according to any one of claims 1 to 9, characterized in that: The method includes: S1, in the initial state, the support rod (11) is in a folded state, the second telescopic cylinder (13) is started, the second telescopic cylinder (13) lifts the sliding deployment ring (9), the sliding deployment ring (9) moves upward, and the sliding deployment ring (9) pushes the multiple support rods (11) to unfold and form a flat state; S2, installing an assembly plate (301) on a support rod (11) on the ground, and locking the pins (303) of a plurality of assembly plates (301) in the locking holes (1101) to form a bearing platform (3) with a circular structure; S3, installing a telescopic ladder (4) on the lower surface of the assembly plate (301), wherein the hinge seat of the telescopic ladder (4) is fixed to the lower surface of the assembly plate (301) via a nut, and the fixed guardrail (2) is moved to the top of the bearing platform (3) via the telescopic ladder (4), and the fixed guardrail (2) is clamped in the socket (302) of the bearing platform (3); S5, start the first telescopic cylinder (12), start lifting the sliding sleeve (8), and the sliding sleeve (8) lifts the bearing platform (3) to the construction position; S4, the support foot (401) at the lower end of the telescopic ladder (4) is fixed against the ground, and the moving wheel (7) of the moving base (6) is fixed; S5. After the construction is completed, the personnel dismantle the fixed guardrail (2) and the lifting guardrail (1), and the personnel descend to the ground from the telescopic ladder (4). The first telescopic cylinder (12) returns to its original position, and the bearing platform (3) descends to the height of the detachable bearing platform (3), and the assembly plate (301) and the telescopic ladder (4) are completely dismantled. S6. After the assembly plate (301) is disassembled, the second telescopic cylinder (13) starts to contract to drive the sliding deployment ring (9) to descend, and the sliding deployment ring (9) drives the plurality of support rods (11) to contract and fold to the position of the fixed cylinder (5), thereby completing the folding of the working platform.

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