Inner platform of large spherical tank
By designing an adjustable cargo basket and a rotating column mechanism for the inner platform, the problems of long construction time and secondary damage to the inner platform of large spherical tanks were solved, enabling multiple people and multiple pieces of equipment to work simultaneously and improving maintenance efficiency.
Patent Information
- Application Number
- CN202423170097.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2034-12-23
AI Technical Summary
The existing large spherical tank platforms take a long time to build and are prone to secondary damage. They also cannot accommodate multiple people and equipment for maintenance work at the same time, resulting in extended maintenance cycles.
Design an inner platform including columns and a platform. The platform is raised and lowered by a vertical lifting mechanism. The cargo basket consists of a fixed section and an extension section. It moves on the inner wall of the spherical tank through a platform telescopic component and its position is adjusted by a column rotation mechanism, so as to realize the area adjustment of the cargo basket and multi-point operation.
This allows for the simultaneous accommodation of more personnel and equipment at any location on the inner wall of a large spherical tank, shortening maintenance time, reducing secondary damage, and improving maintenance efficiency.
Smart Images
Figure CN223950689U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of the overhaul operation platform of large pressure vessels, in particular to an inner platform of a large spherical tank. BACKGROUND
[0002] The large spherical tank is a special steel spherical storage container with large capacity and high pressure bearing, which can be used to store liquid or gaseous materials. For example, in the compressed air energy storage system, the spherical tank can be used to store high-temperature heat storage medium and low-temperature heat storage medium, and can also be used to store compressed air.
[0003] The large spherical tank is generally spliced by spherical shell plates, and welding process is used at the splicing part. In order to ensure the safe and stable operation of the large spherical tank, it must be periodically overhauled during service to find cracks and perform repair welding and other operations, and an inner platform is needed when performing periodic maintenance work.
[0004] The mainstream inner platform of the prior art is to erect a scaffold in the large spherical tank, and the maintenance workers carry out work on the inner wall of the spherical tank through the scaffold. This inner platform can satisfy simultaneous work of multiple people, but the erection time of this inner platform is very long, especially for large spherical tanks, the erection time is close to one month, which will increase the maintenance time of the large spherical tank. In addition, when erecting the scaffold in the large spherical tank, part of the scaffold rods need to be welded with the inner wall of the spherical tank to ensure its stability, which is very easy to cause secondary damage to the inside of the spherical tank. There is also an inner platform in the prior art, which has a working frame for carrying maintenance personnel and tools. The inner platform includes a stand column and a horizontal moving mechanism. The stand column is erected on the bottom of the inner platform, and after the horizontal moving mechanism is lifted to a predetermined height on the stand column, the horizontal moving mechanism is used to make the workers reach the working point of the inner wall of the spherical tank. However, the working frame on this inner platform has a small area and a limited number of people can work simultaneously, which will also increase the work cycle of the spherical tank maintenance.
[0005] Therefore, how to provide a spherical tank inner platform that can accommodate more workers and equipment at the same time, so that more personnel and equipment can simultaneously perform maintenance work at the inner wall of the spherical tank at any height, thereby reducing the work time of the spherical tank maintenance and improving the maintenance efficiency of the spherical tank, is a technical problem that needs to be solved by those skilled in the art. SUMMARY
[0006] The purpose of the present application is to provide a spherical tank inner maintenance platform, which can accommodate more personnel and equipment at the same time when performing maintenance on the inner wall of the spherical tank.
[0007] To achieve the above object, in one aspect, an inner platform of a large spherical tank is provided, which comprises a column and a platform, the platform being lifted along the column in the direction of the height of the spherical tank by a vertical lifting mechanism; the platform comprises at least two groups of platform telescopic assemblies, each group of the platform telescopic assemblies being provided with an adjustable load basket at the end away from the column, the load basket being moved to the inner wall of the spherical tank by the platform telescopic assembly; the load basket comprises a fixed section and an extension section, the extension section sliding in the fixed section.
[0008] Further, the load basket comprises one fixed section and two extension sections; the two extension sections respectively extend from the openings at the two ends of the fixed section, or the two extension sections are respectively accommodated in the two ends of the fixed section.
[0009] Further, one end of the extension section is provided with a bending part, the rotation center axis of the bending part being located on the side of the extension section away from the inner wall of the spherical tank.
[0010] Further, the fixed section is rotationally connected with the telescopic arm at the end of the platform telescopic assembly.
[0011] Further, the telescopic assembly comprises at least two levels of telescopic arms, the telescopic arms being connected by telescopic cylinders.
[0012] Further, a column rotating mechanism is further included; the column rotating mechanism comprises a rotating driving assembly, a center column and a support seat; the column is sleeved outside the center column and fixed with the center column; the rotating driving assembly comprises a driving bevel gear, a driven bevel gear, a motor and a speed reducer, the driven bevel gear being fixed with the center column, the driving bevel gear and the driven bevel gear being arranged perpendicularly and engaged, the driving bevel gear being driven by the motor and the speed reducer; the support seat has a sliding bearing inside, the column and the center column being fixed in the inner ring of the sliding bearing.
[0013] Further, the vertical lifting mechanism comprises at least two groups of winches, the at least two groups of winches being synchronously operated by an industrial computer.
[0014] Further, the edge of the opening of the fixed section has a first rope hitch, the edge of the extension section away from the fixed section has a second rope hitch, the first rope hitch and the second rope hitch being fixed by a rope when the extension section extends from the fixed section.
[0015] Further, the platform telescopic assembly is provided with at least six groups, each group of the platform telescopic assembly being provided with a group of adjustable load baskets at the end away from the column.
[0016] One of the above technical solutions has the following advantages or beneficial effects:
[0017] The inner platform of a large spherical tank comprises a column and a platform, the platform is lifted along the column in the height direction of the spherical tank by a vertical lifting mechanism. The platform comprises at least two groups of platform telescopic assemblies, and each group of platform telescopic assemblies is provided with an adjustable load basket at the end away from the column, the length of the load basket is crossed with the telescopic direction of the platform telescopic assembly. The load basket is moved to the inner wall of the spherical tank by the platform telescopic assembly.
[0018] The adjustable load basket comprises a fixed section and an extension section, the extension section slides in the fixed section, and the length and use area of the load basket are adjusted by the extension section telescoping in the fixed section. When the platform is located at a height where the cross-sectional circumference of the spherical tank is small, the extension section is completely retracted in the fixed section, and as the cross-sectional circumference of the spherical tank increases, the extension section is extended and fixed to the fixed section by moving the extension section relative to the fixed section, thereby increasing the current use area of the load basket.
[0019] Therefore, by the inner platform of the present scheme, as the cross-sectional circumference of the spherical tank increases, the area of the load basket also increases, which can ensure that more personnel and equipment can be accommodated at the same time. Even at the equator where the diameter of the spherical tank is the largest, by reasonably arranging the number of platform telescopic assemblies and load baskets and adjusting the area of the platform telescopic assemblies and load baskets, more personnel can be accommodated at the equator where the circumference of the spherical tank is the largest, and multi-point operations on the inner wall of the spherical tank can be realized. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 is a schematic diagram of the installation of the inner platform of a large spherical tank in the spherical tank according to example one;
[0021] Figure 2 is a schematic diagram of the installation of the inner platform of a large spherical tank in the spherical tank according to example one; Figure 1 is an enlarged view of I in figure 1;
[0022] Figure 3 is a schematic diagram of the extension section of a load basket being retracted in the fixed section according to example one;
[0023] Figure 4 is a schematic diagram of the structure of the telescopic arm and the load basket according to example one;
[0024] Figure 5 is a schematic diagram of the extension section of a load basket being fully deployed according to example one;
[0025] Figure 6 is a schematic diagram of the extension section of another load basket being retracted in the fixed section according to example one;
[0026] Figure 7 is a schematic diagram of the rotating connection between the load basket and the last telescopic arm according to example one;
[0027] Figure 8 is a schematic diagram of the rotating connection between the load basket and the last telescopic arm according to example one; Figure 7Another view in another direction.
[0028] In the figure: 10 - column; 20 - platform; 21 - platform center frame; 22 - platform telescopic assembly; 221 - telescopic arm; 40 - object basket; 41 - fixed section; 42 - extension section; 43 - bending part; 44 - rope; 50 - column rotating mechanism; 51 - driving bevel gear; 52 - driven bevel gear; 53 - motor; 54 - speed reducer; 55 - center column; 56 - first support; 57 - second support; 60 - support seat; 61 - sliding bearing; 62 - supporting leg; 71 - waist-shaped slot; 72 - bolt rod; 73 - nut; 80 - winch; 90 - spherical tank; 91 - manhole. DETAILED DESCRIPTION
[0029] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects reached more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict.
[0030] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0031] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "above" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0032] Embodiment one:
[0033] As Figures 1-8As shown, the inner platform 20 of the large spherical tank in the embodiment comprises a column 10 and a platform 20, the platform 20 is lifted along the column 10 in the height direction of the spherical tank 90 by a vertical lifting mechanism. The platform 20 comprises at least two groups of platform telescopic assemblies 22, and each group of platform telescopic assemblies 22 is provided with an adjustable load basket 40 at the end away from the column 10, the length of the load basket 40 is crossed with the telescopic direction of the platform telescopic assembly 22. The load basket 40 is moved to the inner wall of the spherical tank 90 by the platform telescopic assembly 22.
[0034] As Figures 3-6 , the adjustable load basket 40 comprises a fixed section 41 and an extension section 42, the extension section 42 slides in the fixed section 41, and the length and use area of the load basket 40 are adjusted by the extension of the extension section 42 in the fixed section 41. When the platform 20 is located at the height where the cross-sectional circumference of the spherical tank 90 is small, the extension section 42 is completely retracted in the fixed section 41, and as the cross-sectional circumference of the spherical tank 90 increases, the extension section 42 is extended and fixed to the fixed section 41 by moving the extension section 42 relative to the fixed section 41, thereby increasing the current use area of the load basket 40. Therefore, by the inner platform 20 of the scheme, as the cross-sectional circumference of the spherical tank 90 increases, the area of the load basket 40 also increases, which can ensure that more personnel and equipment can be accommodated at the same time. Even at the equator where the diameter of the spherical tank 90 is the largest, by reasonably arranging the number of platform telescopic assemblies 22 and load baskets 40, adjusting the area of the platform telescopic assemblies 22 and the load baskets 40, it is realized that more personnel can be accommodated at the equator where the circumference of the spherical tank 90 is the largest, and the inner wall of the spherical tank 90 can be operated at multiple points at the same time.
[0035] Further, as Figure 4 , the load basket 40 comprises a fixed section 41 and two extension sections 42; the two extension sections 42 are respectively extended from the openings at the two ends of the fixed section 41, or the two extension sections 42 are respectively accommodated in the two ends of the fixed section 41. When the two extension sections 42 are respectively extended from the openings at the two ends of the fixed section 41, the load capacity of the load basket 40 is the largest, and such a load basket 40 can be operated near the equatorial plate of the spherical tank 90. When the two extension sections 42 are respectively accommodated in the two ends of the fixed section 41, the load capacity of the load basket 40 is relatively reduced, and at this time the load capacity of the load basket 40 is determined by the size of the fixed section 41. Arranging the load baskets 40 at the two ends of the fixed section 41 can ensure the stability of the load basket 40 after the extension section 42 is extended, and can greatly increase the load capacity of the load basket 40.
[0036] Further, as Figures 4-6The one end of the extension section 42 of the carrier basket 40 is provided with a bending part 43, and the rotation center axis of the bending part 43 is located at the side of the extension section 42 which is far away from the inner wall of the spherical tank 90. The common carrier basket 40 is rectangular, and when the plurality of carrier baskets 40 are moved to the inner wall of the spherical tank 90 through the platform telescopic assembly 22, there is a spacing between the adjacent carrier baskets 40. By providing the bending part 43 at one end of the extension section 42, the spacing between the adjacent carrier baskets 40 can be supplemented.
[0037] Further, as shown in FIG. 1, the carrier basket 40 comprises a fixed section 41 and two extension sections 42. The fixed section 41 is connected to the telescopic arm 221 of the platform telescopic assembly 22, and the two extension sections 42 are connected to the fixed section 41. Figure 5 When the carrier basket 40 comprises a fixed section 41 and two extension sections 42, one embodiment is that the bending part 43 can be provided at the end of only one extension section 42, and the angle between the original right angle side and the actual outer side of the bending part 43 is 40° to 50°. Figure 6 Another embodiment is that the bending part 43 can be provided at the end of each of the two extension sections 42, and the angle between the original right angle side and the actual outer side of the bending part 43 is 20° to 30°. Of course, the angle between the original right angle side and the actual outer side of the bending part 43 can be calculated according to the size of the spherical tank 90 to be constructed.
[0038] Further, the bending part 43 can be a basket structure with a fixed angle, for example, the bottom surface, the outer side arc surface and the outer side of the bending part 43 are rigid, and the connection is also rigid. Further, the bottom surface of the bending part 43 can adopt a folding plate or a hinged disc, and the outer side arc surface of the bending part 43 can adopt a flexible cloth, and the support steel bars are distributed in the flexible cloth. Such a bending part 43 can be accommodated in the extension section 42, and the bending angle can be adjusted by the user.
[0039] Further, the fixed section 41 of the carrier basket 40 is rotationally connected to the last telescopic arm 221 of the platform telescopic assembly 22. In order to make the carrier basket 40 fit the inner wall of the spherical tank 90, the angle between the fixed section 41 of the carrier basket 40 and the last telescopic arm 221 of the platform telescopic assembly 22 can be adjusted. In the initial state, the angle between the fixed section 41 of the carrier basket 40 and the last telescopic arm 221 of the platform telescopic assembly 22 is perpendicular or approximately perpendicular, and when the carrier basket 40 approaches the inner wall of the spherical tank 90, the angle between the fixed section 41 of the carrier basket 40 and the last telescopic arm 221 of the platform telescopic assembly 22 can be adjusted in a small range, so that the carrier basket 40 can better approach the inner wall of the spherical tank 90.
[0040] Further, one way of rotatingly connecting the fixed section 41 of the object basket 40 and the telescopic arm 221 at the end of the platform telescopic assembly 22 is to provide a groove at the end of the platform telescopic assembly 22, and two clamping jaws inside the groove, the inside of the two clamping jaws are provided with teeth, and an L-shaped connecting piece is provided at the bottom of the fixed section 41 of the object basket 40, one end of the L-shaped connecting piece is provided with external teeth which are engaged with the teeth inside the two clamping jaws. The top of the clamping jaw is provided with a locking mechanism, and the locking mechanism includes a handle and a locking wheel, and the locking wheel is a cam. The angle between the connecting piece and the two clamping jaws is adjusted to adjust the angle between the fixed section 41 of the object basket 40 and the telescopic arm 221 at the end of the platform telescopic assembly 22, and the locking mechanism is locked.
[0041] As Figures 7-8 Further, another way of rotatingly connecting the fixed section 41 of the object basket 40 and the telescopic arm 221 at the end of the platform telescopic assembly 22 is to provide two waist-shaped grooves 71 and a bolt rod 72 on the telescopic arm 221 at the end of the platform telescopic assembly 22, and the fixed section 41 of the object basket 40 is provided with a through hole which passes through the bolt rod 72, and the fixed section 41 of the object basket is fixed with the telescopic arm 221 at the end of the platform telescopic assembly 22 by using a nut 73. The surface of the fixed section 41 of the object basket 40 which contacts the telescopic arm 221 at the end is provided with two convex columns which slide in the corresponding waist-shaped grooves 71, and the angle between the fixed section 41 of the object basket 40 and the telescopic arm 221 at the end of the platform telescopic assembly 22 is adjusted by the sliding between the convex columns and the waist-shaped grooves 71.
[0042] Further, as Figures 5-6 The telescopic assembly includes at least two levels of telescopic arms 221, and the telescopic arms 221 are connected by telescopic cylinders. For large spherical tanks, three levels of telescopic arms 221 are provided, which ensures stable connection of the platform 20 and large telescopic size.
[0043] Further, as Figures 1-2The inner platform 20 of the large spherical tank further comprises a column rotating mechanism 50, which comprises a rotating driving assembly, a central column 55, and a support base 60. The column 10 is sleeved outside the central column 55 and fixed with the central column 55. The rotating driving assembly comprises a driving bevel gear 51 and a driven bevel gear 52. The driven bevel gear 52 is fixed with the central column 55, and the driving bevel gear 51 is engaged with the driven bevel gear 52. The driving bevel gear 51 is driven by a motor 53 and a speed reducer 54. The support base 60 has a sliding bearing 61 inside, and the column 10 and the central column 55 are fixed to the inner ring of the sliding bearing 61. The support base 60 is supported by a support leg 62 on the inner bottom wall of the spherical tank 90. The driving bevel gear 51 is driven to rotate by the motor 53 and the speed reducer 54. The driving bevel gear 51 is engaged with the driven bevel gear 52, which drives the central column 55 and the column 10 to rotate by an angle, thereby driving the platform 20 on the column 10 to rotate by an angle relative to the inner wall of the spherical tank 90. In this embodiment, since the outer edge of the platform 20 is a straight line and the inner wall of the spherical tank 90 is an arc, the distance between the staff and the inner wall of the spherical tank 90 is different at different positions on the object carrying basket 40. The platform 20 is rotated by an angle by the column rotating mechanism 50, so that the object carrying basket 40 rotates by an angle on the inner wall, and the working point on the object carrying basket 40 which is far away from the inner wall of the spherical tank 90 is close to the inner wall of the spherical tank 90.
[0044] Further, as shown in Fig. 1, the vertical lifting mechanism comprises at least two groups of winches 80, and the at least two groups of winches 80 are synchronously operated by an industrial computer. For example, four groups of winches 80 are arranged, and the cross section of the column 10 of the inner platform 20 is rectangular. The four groups of winches 80 are arranged at the four corners of the column 10, so as to ensure the safety and stability of the lifting of the platform 20. Figures 1-2 Further, as shown in Fig. 1, the vertical lifting mechanism comprises at least two groups of winches 80, and the at least two groups of winches 80 are synchronously operated by an industrial computer. For example, four groups of winches 80 are arranged, and the cross section of the column 10 of the inner platform 20 is rectangular. The four groups of winches 80 are arranged at the four corners of the column 10, so as to ensure the safety and stability of the lifting of the platform 20.
[0045] Figures 5-6 Further, as shown in Fig. 1, the vertical lifting mechanism comprises at least two groups of winches 80, and the at least two groups of winches 80 are synchronously operated by an industrial computer. For example, four groups of winches 80 are arranged, and the cross section of the column 10 of the inner platform 20 is rectangular. The four groups of winches 80 are arranged at the four corners of the column 10, so as to ensure the safety and stability of the lifting of the platform 20.
[0046] Further, as shown in Fig. 1, the vertical lifting mechanism comprises at least two groups of winches 80, and the at least two groups of winches 80 are synchronously operated by an industrial computer. For example, four groups of winches 80 are arranged, and the cross section of the column 10 of the inner platform 20 is rectangular. The four groups of winches 80 are arranged at the four corners of the column 10, so as to ensure the safety and stability of the lifting of the platform 20. Figure 6 Further, as shown in Fig. 1, the vertical lifting mechanism comprises at least two groups of winches 80, and the at least two groups of winches 80 are synchronously operated by an industrial computer. For example, four groups of winches 80 are arranged, and the cross section of the column 10 of the inner platform 20 is rectangular. The four groups of winches 80 are arranged at the four corners of the column 10, so as to ensure the safety and stability of the lifting of the platform 20.
[0047] The installation method of the inner platform of the large spherical tank in use is as follows: first, the center frame 21 of the platform 20 and all the platform telescopic assemblies 22 and all the load baskets 40 are put into the spherical tank through the manhole 91 of the spherical tank, and the platform 20 is assembled at the bottom of the spherical tank. Then, the first support 56 and the second support 57 are arranged outside the spherical tank at the manhole 91, the center column is put into the stand column, the driving bevel gear 51, the driven bevel gear 52, the motor 53 and the speed reducer 54 are assembled, and the assembly of the stand column rotating mechanism 50 is completed. Finally, the hoist 80 is installed, and the rope of the hoist 80 is fixed at the center frame of the platform. In use, according to the position of the platform in the spherical tank, the size and angle of the load basket are adjusted by the user, so that more personnel and equipment can be simultaneously accommodated on the platform at the height, and the construction speed on the inner wall of the spherical tank is improved.
[0048] Obviously, the above embodiments of the present application are merely exemplary and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. All the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.
Claims
1. An inner platform of a large spherical tank, characterized by, The vertical column and the platform, the platform is lifted along the vertical column in the direction of the spherical tank height by the vertical lifting mechanism; The platform includes at least two groups of platform telescopic assemblies, and each group of the platform telescopic assemblies is provided with an adjustable object carrying basket at an end away from the vertical column, and the object carrying basket is moved to the inner wall of the spherical tank by the platform telescopic assembly; The object carrying basket includes a fixed section and an extension section, and the extension section slides in the fixed section.
2. The inner platform of a large spherical tank according to claim 1, characterized by The object carrying basket includes one fixed section and two extension sections, and the two extension sections respectively extend from the openings at the two ends of the fixed section, or the two extension sections are respectively accommodated in the two ends of the fixed section.
3. The inner platform of a large spherical tank according to claim 1, characterized by, One end of the extension section is provided with a bending part, and the rotation center axis of the bending part is located on the side of the extension section away from the inner wall of the spherical tank.
4. The inner platform of a large spherical tank according to claim 1, characterized by The fixed section is rotationally connected with the telescopic arm at the end of the platform telescopic assembly.
5. The inner platform of a large spherical tank according to claim 1, wherein The telescopic assembly includes at least two levels of telescopic arms, and the telescopic arms are connected by telescopic cylinders.
6. The inner platform of a large spherical tank according to claim 1, wherein The vertical column rotation mechanism includes a rotation driving assembly, a center column and a support seat, the vertical column is sleeved outside the center column and fixed with the center column; The rotation driving assembly includes a driving bevel gear, a driven bevel gear, a motor and a speed reducer, the driven bevel gear is fixed with the center column, the driving bevel gear and the driven bevel gear are vertically arranged and engaged, and the driving bevel gear is driven by the motor and the speed reducer; The support seat is internally provided with a sliding bearing, and the vertical column and the center column are fixed in the inner ring of the sliding bearing.
7. The inner platform of a large spherical tank according to claim 1, wherein The vertical lifting mechanism includes at least two groups of winches, and the at least two groups of winches are synchronously operated by an industrial computer.
8. The inner platform of a large spherical tank according to claim 1, wherein The edge of the opening of the fixed section is provided with a first rope buckle, and the edge of the extension section away from the fixed section is provided with a second rope buckle, and the first rope buckle and the second rope buckle are fixed by a rope when the extension section extends from the fixed section.
9. An inner platform for a large spherical tank according to any one of claims 1-8, characterized in that, The platform telescopic assembly is provided with at least six groups, and each group of the platform telescopic assembly is provided with a group of adjustable object carrying baskets at an end away from the vertical column.