Safety protection equipment for operation port of hydropower station

By combining the convenient movement of casters with the worm gear transmission and spring-loaded rod structure, the problem of cumbersome width adjustment of safety protection equipment at hydropower station work sites has been solved, enabling rapid and precise width and height adjustment and ensuring the safety of the work site.

CN223724307UActive Publication Date: 2025-12-26贵州北盘江电力股份有限公司
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202520007629.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-02
Publication Date
2025-12-26
Estimated Expiration
2035-01-02

AI Technical Summary

Technical Problem

The existing safety protection equipment at the working entrance of hydropower stations is cumbersome to operate when adjusting the width, requiring a lot of time and manpower.

Method used

The base design features omnidirectional wheels for easy movement, combined with a worm gear drive and spring-loaded rod structure, enabling rapid and precise adjustment of the width and height of the protective equipment.

Benefits of technology

It enables rapid and precise adjustment of the width and height of the safety protection equipment at the hydropower station work entrance, flexibly adapting to the needs of work entrances of different sizes and heights, and ensuring the safety of the work site.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223724307U_ABST
    Figure CN223724307U_ABST
Patent Text Reader

Abstract

The utility model relates to the technical field of hydropower station operation equipment, and discloses a hydropower station operation port safety protection device which comprises two bases, the bottoms of the bases are rotationally connected with two universal wheels, the tops of the bases are provided with protection assemblies, and adjusting assemblies are arranged in the protection assemblies. A plurality of telescopic rods are fixedly connected between the two protection assemblies, one protection assembly is fixedly connected with a sleeve rod, the other protection assembly is fixedly connected with a sliding rod, the outer side of the sliding rod is slidably connected to the interior of the sleeve rod, a fixing assembly is arranged on the outer side of the sleeve rod, and the fixing assembly comprises a first thin shell. The outer side of the first thin shell is fixedly connected to the outer side of the sleeve rod. According to the safety protection device for the hydropower station operation port, through mutual cooperation of the inserting rods, the baffles, the springs, the stopping blocks and other structures, the width of the safety protection device for the hydropower station operation port can be rapidly, accurately and stably adjusted, and the protection device can flexibly meet the actual requirements of operation ports of different sizes.
Need to check novelty before this filing date? Find Prior Art

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydropower station operation equipment, especially to a hydropower station operation port safety protection equipment. BACKGROUND

[0002] The hydropower station is a water conservancy hub project with important influence, which makes full use of local water energy resources and is equipped with advanced generator units to efficiently convert water energy into electric energy. The dam is magnificent and solid, not only has considerable power generation capacity, but also plays a key role in flood control, irrigation, navigation and other aspects, providing solid energy security and comprehensive benefits for the development of the region.

[0003] In the prior art, the common hydropower station operation port safety protection equipment often adjusts the width by screwing the bolts and nuts to change the position of the components to adjust the width, which is complicated to operate and requires a lot of time and manpower.

[0004] In view of the above problems, a hydropower station operation port safety protection equipment is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0005] In order to make up for the above shortcomings, the utility model provides a hydropower station operation port safety protection equipment, which aims to improve the problem that the hydropower station operation port safety protection equipment in the prior art often adjusts the width by screwing the bolts and nuts to change the position of the components to adjust the width, which is complicated to operate and requires a lot of time and manpower.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a hydropower station operation port safety protection equipment, comprising two bases, the base bottom is rotatably connected with two universal wheels, the base top is provided with a protection assembly, the protection assembly is internally provided with an adjusting assembly, a plurality of telescopic rods are fixedly connected between the two protection assemblies, one of the protection assemblies is fixedly connected with a sleeve rod, the other protection assembly is fixedly connected with a sliding rod, the sliding rod is slidably connected in the sleeve rod, and a fixing assembly is arranged on the outside of the sleeve rod.

[0007] The fixing assembly comprises a thin shell one, the thin shell one is fixedly connected on the outside of the sleeve rod, a plug-in rod is slidably connected in the thin shell one, a baffle is fixedly connected on the outside of the plug-in rod, a spring is sleeved on the outside of the plug-in rod, a thin shell two is fixedly connected on the top of the thin shell one, and a blocking block is arranged on the top of the baffle.

[0008] Further description of the above technical scheme:

[0009] The protection assembly comprises two support columns, the support column bottom is fixedly connected on the base top, a protection plate one is fixedly connected between the two support columns, and an adjusting assembly is arranged in the support column.

[0010] As a further description of the above technical solutions:

[0011] The adjusting assembly comprises two protective shells, the protective shells are fixedly connected outside the support columns, rotating shafts are rotatably connected inside the protective shells, worm wheels are fixedly connected outside the rotating shafts, connecting rods are rotatably connected between the two protective shells, handles are fixedly connected outside the connecting rods, two worm gears are fixedly connected outside the connecting rods, the worm gears are in meshing connection with the worm wheels, gears are fixedly connected outside the rotating shafts, racks are fixedly connected to inner walls of the moving shells, the racks are in meshing connection with the gears, and the two moving shells are fixedly connected with protective plates two inside.

[0012] As a further description of the above technical solutions:

[0013] The blocking blocks are slidably connected inside the thin shell two, the blocking blocks are slidably connected inside the thin shell one, and the baffle is slidably connected to an inner wall of the thin shell one.

[0014] As a further description of the above technical solutions:

[0015] One end of the spring is fixedly connected to an inner wall of the thin shell one, and the other end of the spring is fixedly connected outside the baffle.

[0016] As a further description of the above technical solutions:

[0017] The sliding rod is internally provided with a plurality of clamping grooves, and the plug-in rod is externally plugged into one of the clamping grooves.

[0018] As a further description of the above technical solutions:

[0019] The moving shells are slidably connected inside the support columns, and the protective plates two are slidably connected inside the support columns.

[0020] As a further description of the above technical solutions:

[0021] The rotating shafts are rotatably connected inside the support columns, and the racks are slidably connected inside the support columns.

[0022] The utility model has the advantages of the following beneficial effects:

[0023] 1. The utility model discloses a width of the safety protection equipment of water and electricity station operation mouth can be adjusted, and the width of the safety protection equipment of water and electricity station operation mouth can be adjusted quickly, accurately and stably, and the safety protection equipment can flexibly adapt to the actual demand of different size operation mouth.

[0024] 2. The utility model discloses a handle is rotated, and it drives the connecting rod rotation between two protection shell, makes the outside worm rotate along with, because worm and the worm wheel in the protection shell are engaged, and then drive the rotation of the pivot, the gear on the pivot and the rack of the moving shell inner wall are engaged, drive the moving shell to slide up and down in the support column, drive protection board no. 2 synchronous movement, thereby realize the accurate adjustment of the protection height, satisfy the safety protection demand of different height operation mouth, effectively prevent personnel or object from falling from the operation mouth, guarantee the safety of water and electricity station operation site. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a kind of water and electricity station operation mouth safety protection equipment's perspective diagram for the utility model proposes;

[0026] Figure 2 It is the structure schematic diagram of the moving shell of a kind of water and electricity station operation mouth safety protection equipment for the utility model proposes;

[0027] Figure 3 It is the structure schematic diagram of rack for the utility model proposes;

[0028] Figure 4 It is Figure 3 It is the enlarged view of place A in the utility model;

[0029] Figure 5 It is the structure schematic diagram of spring for the utility model proposes a kind of water and electricity station operation mouth safety protection equipment.

[0030] LEGEND:

[0031] 1, base;2, universal wheel;3, protection assembly;301, support column;302, protection board no. 1;4, protection shell;5, handle;6, connecting rod;7, moving shell;8, rack;9, pivot;10, gear;11, worm;12, worm wheel;13, protection board no. 2;14, card slot;15, telescopic rod;16, sleeve rod;17, slide bar;18, thin shell no. 1;19, thin shell no. 2;20, blocking block;21, plug-in rod;22, spring;23, baffle. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0033] With reference to Figure 1 Figure 3 An embodiment provided by the utility model: a kind of hydropower station operating mouth safety protection equipment, two bases 1 are included, two universal wheels 2 are rotatably connected in the bottom of base 1, protective assembly 3 is provided in the top of base 1, adjusting assembly is provided in protective assembly 3, a plurality of telescopic rods 15 are fixedly connected between two protective assemblies 3, one of protective assembly 3 is fixedly connected with sleeve rod 16, another protective assembly 3 is fixedly connected with slide bar 17, slide bar 17 is slidably connected in the inside of sleeve rod 16, fixed assembly is provided in the outside of sleeve rod 16;

[0034] Fixed assembly includes shell one 18, shell one 18 is fixedly connected in the outside of sleeve rod 16, plug-in rod 21 is slidably connected in the inside of shell one 18, baffle 23 is fixedly connected in the outside of plug-in rod 21, spring 22 is set in the outside of plug-in rod 21, shell two 19 is fixedly connected in the top of shell one 18, blocking block 20 is provided in the top of baffle 23.

[0035] ​Specifically, two bases 1 are used to support the entire safety protection device, so that it can be stably placed on the ground near the working port of the hydropower station; the two universal wheels 2 rotatably connected at the bottom of the base 1 are used to facilitate the movement of the safety protection device to the specific position required by the working port of the hydropower station, so as to quickly deploy and subsequently install and debug the device; the protection assembly 3 provided at the top of the base 1 is used to form a protective barrier around the working port to prevent personnel or objects from accidentally falling into the working port and ensure the safety of the working site; the plurality of telescopic rods 15 fixedly connected between the two protection assemblies 3 are used to keep the relative position between the two protection assemblies 3 stable, and can also adapt to the basic needs of different width working ports to a certain extent; the sleeve rod 16 fixedly connected to one of the protection assemblies 3 and the sliding rod 17 fixedly connected to the other protection assembly 3 are slidingly connected outside the sleeve rod 16, which is used to accurately adjust according to the actual width of the working port, so that the protection device can better fit the size of the working port; the fixed assembly provided outside the sleeve rod 16, wherein the outer side of the shell one 18 is fixedly connected to the outside of the sleeve rod 16, is used to provide an installation base and a protective shell for other components in the fixed assembly; the plug-in rod 21 slidingly connected inside the shell one 18 is used to be inserted into the clamping groove 14 inside the sliding rod 17, so as to realize the relative fixation of the sliding rod 17 and the sleeve rod 16 and ensure the stability of the protection device after width adjustment; the baffle 23 fixedly connected outside the plug-in rod 21 is used to prevent the plug-in rod 21 from being inserted too far into the shell one 18, and can also push the plug-in rod 21 to perform the insertion action under the action of the spring 22; the spring 22 sleeved outside the plug-in rod 21 is used to provide an outward spring force to the plug-in rod 21, so that it can be stably inserted into the clamping groove 14 of the sliding rod 17; the shell two 19 fixedly connected to the top of the shell one 18 is used to cooperate with the installation and sliding of the blocking block 20 to realize the blocking and releasing functions of the baffle 23; the blocking block 20 provided at the top of the baffle 23 is used to block the movement of the baffle 23 at a specific position to prevent the plug-in rod 21 from being accidentally inserted into the clamping groove 14 under the action of the spring 22, and when fixation is required, the control of the baffle 23 is realized by operating the blocking block 20, thereby completing the width fixation operation of the protection device.

[0036] Referring to Figure 1 - Figure 3 The protection assembly 3 comprises two support columns 301, the support columns 301 are fixedly connected at the top of the base 1, a protection plate one 302 is fixedly connected between the two support columns 301, and an adjustment assembly is arranged inside the support column 301.

[0037] Specifically, the two support columns 301 are fixedly connected at the bottom of the base 1 at the top thereof, are used to support the entire protection assembly 3, provide a stable vertical support structure for the protection plate 302, and ensure the stability and reliability of the protection device in the vertical direction; the protection plate 302 fixedly connected between the two support columns 301 is used to form a preliminary protection barrier on one side of the water power station operation opening, block personnel or objects from approaching the operation opening from the side, and reduce the risk of accidental falling; the adjusting assembly arranged inside the support column 301 is used to flexibly adjust the height of the protection assembly 3, so as to adapt to the protection requirements of operation openings of different heights, make the protection device more accurately fit the actual operation environment, and provide more effective safety protection.

[0038] With reference to Figure 3 and Figure 4 , the adjusting assembly comprises two protection shells 4 and moving shells 7. The protection shells 4 are fixedly connected outside the support columns 301. The protection shells 4 are rotatably connected with rotating shafts 9 inside the protection shells 4. The rotating shafts 9 are fixedly connected with worm wheels 12 outside the rotating shafts 9. The two protection shells 4 are rotatably connected with connecting rods 6 between the two protection shells 4. The connecting rods 6 are fixedly connected with handles 5 outside the connecting rods 6. The connecting rods 6 are fixedly connected with two worm gears 11 outside the connecting rods 6. The worm gears 11 are meshingly connected with the worm wheels 12. The rotating shafts 9 are fixedly connected with gear wheels 10 outside the rotating shafts 9. The moving shells 7 are fixedly connected with racks 8 on the inner walls of the moving shells 7. The racks 8 are meshingly connected with the gear wheels 10. The two moving shells 7 are fixedly connected with protection plates 13 inside the two moving shells 7.

[0039] Specifically, the two protection shells 4 are fixedly connected outside the support columns 301, are used to protect the transmission components inside the protection shells 4, and provide installation bases and stable operation spaces for the rotating shafts 9, the worm gears 11 and other components. The rotating shafts 9 rotatably connected inside the protection shells 4 are used to transmit torque and drive the worm wheels 12 and the gear wheels 10 on the rotating shafts 9 to rotate. The worm wheels 12 fixedly connected outside the rotating shafts 9 are used to mesh with the worm gears 11, change the transmission direction, and increase the force, so that the adjusting operation is more labor-saving and stable. The connecting rods 6 rotatably connected between the two protection shells 4 are used to connect the transmission components on the two sides and drive the worm gears 11 to rotate by rotating. The handles 5 fixedly connected outside the connecting rods 6 are used to facilitate the operating personnel to exert the rotating torque and drive the entire adjusting assembly to work. The two worm gears 11 fixedly connected outside the connecting rods 6 are used to mesh with the worm wheels 12 to transmit the rotation of the handles 5 to the rotation of the rotating shafts 9. The gear wheels 10 fixedly connected outside the rotating shafts 9 are used to mesh with the racks 8 on the inner walls of the moving shells 7 to convert the circular motion of the rotating shafts 9 to the linear motion of the moving shells 7. The racks 8 fixedly connected on the inner walls of the moving shells 7 are used to cooperate with the gear wheels 10 to realize the up-down movement of the moving shells 7. The protection plates 13 fixedly connected inside the two moving shells 7 are used to move up and down inside the support columns 301, so as to adjust the protection height of the protection assembly 3, adapt to the safety protection requirements of operation openings of different heights, and effectively prevent personnel or objects from falling from the operation opening.

[0040] Reference Figure 1 - Figure 5 The outer side of the blocking block 20 is slidably connected to the inside of the thin shell 19, the outer side of the blocking block 20 is slidably connected to the inside of the thin shell 18, the outer side of the baffle 23 is slidably connected to the inner wall of the thin shell 18, one end of the spring 22 is fixedly connected to the inner wall of the thin shell 18, and the other end of the spring 22 is fixedly connected to the outer side of the baffle 23. The sliding rod 17 has multiple slots 14 inside, and the outer side of the plug rod 21 is inserted into one of the slots 14. The outer side of the movable shell 7 is slidably connected to the inside of the support column 301, the outer side of the protective plate 13 is slidably connected to the inside of the support column 301, the outer side of the rotating shaft 9 is rotatably connected to the inside of the support column 301, and the outer side of the rack 8 is slidably connected to the inside of the support column 301.

[0041] Specifically, the outer side of the blocking block 20 is slidably connected to the inside of the second thin shell 19 and the first thin shell 18 to block or allow the baffle 23 to pass through at different positions, thereby controlling the position of the connecting rod 21 to fix or loosen the sleeve rod 16 and the sliding rod 17, facilitating the adjustment of the width of the protective equipment. The outer side of the baffle 23 is slidably connected to the inner wall of the first thin shell 18 to move stably within the first thin shell 18, and under the elastic force of the spring 22, it drives the connecting rod 21 to insert into or leave the slot 14 of the sliding rod 17. One end of the spring 22 is fixedly connected to the inner wall of the first thin shell 18, and the other end is fixedly connected to the outer side of the baffle 23 to provide elastic potential energy to the baffle 23, so that the baffle 23 can push the connecting rod 21 into the slot 14 when there is no external force interference, ensuring the fixed state of the sliding rod 17 and the sleeve rod 16. Multiple slots 14 are opened inside the sliding rod 17 to cooperate with the connecting rod 21. By inserting the connecting rod 21 into different slots 14, the width of the protective equipment can be adjusted in multiple levels. The adjustment mechanism allows it to better adapt to different widths of work openings. The outer side of the movable shell 7 is slidably connected to the inside of the support column 301 to allow it to slide stably up and down within the support column 301. Driven by the adjustment component, it drives the protective plate 13 to adjust its height to meet the protection height requirements of different work openings. The outer side of the protective plate 13 is slidably connected to the inside of the support column 301 to move together with the movable shell 7 within the support column 301, achieving precise adjustment of the protection height and preventing personnel or objects from falling into the work opening from a height. The outer side of the rotating shaft 9 is rotatably connected to the inside of the support column 301 to allow it to rotate stably within the support column 301, converting the rotation transmitted from the connecting rod 6 into the rotation of the gear 10, thereby driving the movable shell 7 to move. The outer side of the rack 8 is slidably connected to the inside of the support column 301 to allow it to mesh stably with the gear 10 within the support column 301, converting the circular motion of the gear 10 into linear motion, driving the movable shell 7 to slide up and down, and achieving adjustment of the protection height.

[0042] Working principle: first, the base 1 at the bottom of the device is rotatably connected with two universal wheels 2, which can conveniently move the entire protective device to the required position of the hydropower station operation port for subsequent installation and debugging. When the device is in place, the distance between the two protective components 3 is adjusted to adapt to the actual width of the operation port. When the width of the safety protection device needs to be adjusted, the operator manually pulls the insertion rod 21, which moves the baffle 23 fixedly connected thereto outward. In this process, the spring 22 outside the insertion rod 21 is gradually compressed by the extrusion of the baffle 23. Continue to pull until the insertion rod 21 is completely separated from one of the plurality of clamping grooves 14 in the sliding rod 17. At this time, due to the action of gravity, the blocking block 20 originally located in the thin shell 2 19 will slide into the thin shell 1 18 along the sliding connection channel of the thin shell 1 18 and the thin shell 2 19. Its position can block the baffle 23, prevent the baffle 23 from being inserted into the clamping groove 14 again under the elastic restoring force of the spring 22, so that the insertion rod 21 is kept in a state of disengagement from the clamping groove 14, and provides conditions for the subsequent sliding of the sliding rod 17 in the sleeve rod 16.

[0043] Then, the operator can pull the sliding rod 17 to smoothly slide left and right inside the sleeve rod 16. According to the actual width of the operation port, the distance between the two protective components 3 is flexibly adjusted to achieve precise width adaptation. When the width is adjusted to the appropriate degree, the operator pulls the blocking block 20 upward, which moves upward along the sliding connection track of the thin shell 1 18 and the thin shell 2 19. At this time, the blocking block 20 no longer forms resistance to the baffle 23, so the compressed spring 22 will use its stored elastic potential energy to push the baffle 23, which in turn drives the insertion rod 21 to quickly insert into one of the clamping grooves 14 of the sliding rod 17, so that the sliding rod 17 and the sleeve rod 16 are fixed again, realizing the rapid, accurate and stable adjustment of the width of the hydropower station operation port safety protection device, so that the protective device can flexibly adapt to the actual needs of different size operation ports;

[0044] By rotating the handle 5 on the connecting rod 6, the connecting rod 6 will rotate between the two protective shells 4, and the two worms 11 outside the connecting rod 6 will rotate. Since the worm 11 is meshed with the worm gear 12 in the protective shell 4, the worm gear 12 will drive the shaft 9 to rotate, and the gear 10 outside the shaft 9 will mesh with the rack 8 on the inner wall of the moving shell 7. In this way, the moving shell 7 will slide up and down inside the support column 301, and at the same time, the second protective plate 13 fixed inside the moving shell 7 will slide up and down in the support column 301, thereby realizing accurate adjustment of the protection height to meet the safety protection needs of different height operation ports, effectively preventing personnel or objects from falling from the operation port, and ensuring the safety of the hydropower station operation site.

[0045] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A safety protection device for the operating port of a hydroelectric power station, comprising two bases (1), characterized in that: The base (1) bottom rotationally connected with two universal wheels (2), the base (1) top is provided with protection assembly (3), the protection assembly (3) is provided with adjusting assembly inside, a plurality of telescopic link (15) are fixedly connected between two protection assembly (3), one of the protection assembly (3) is fixedly connected with sleeve rod (16), another protection assembly (3) is fixedly connected with slide rod (17), the slide rod (17) outside is slidably connected in the sleeve rod (16) inside, the sleeve rod (16) outside is provided with fixed assembly; The fixed assembly includes a thin shell (18), the thin shell (18) is fixedly connected to the outside of the sleeve rod (16), the thin shell (18) is slidably connected with the plug-in rod (21) inside, the plug-in rod (21) is fixedly connected with the baffle (23) outside, the plug-in rod (21) is provided with a spring (22) outside, the thin shell (18) top is fixedly connected with thin shell (19), the baffle (23) top is provided with a blocking block (20).

2. A safety protection device for the operating port of a hydropower station according to claim 1, characterized in that: The protection assembly (3) includes two support columns (301), the support column (301) bottom is fixedly connected to the top of the base (1), the protection plate (302) is fixedly connected between two support columns (301), the support column (301) is provided with adjusting assembly inside.

3. A safety device for the operating opening of a hydroelectric power plant according to claim 2, characterized in that: The adjusting assembly includes two protection shell (4) and mobile shell (7), the protection shell (4) is fixedly connected to the outside of the support column (301), the protection shell (4) is rotatably connected with the shaft (9) inside, the shaft (9) is fixedly connected with the worm wheel (12) outside, the connecting rod (6) is rotatably connected between two protection shell (4), the connecting rod (6) is fixedly connected with the handle (5) outside, the connecting rod (6) is fixedly connected with two worm (11) outside, the worm (11) and the worm wheel (12) are engagedly connected, the shaft (9) is fixedly connected with the gear (10) outside, the rack (8) is fixedly connected to the inner wall of the mobile shell (7), the rack (8) and the gear (10) are engagedly connected, two mobile shell (7) is fixedly connected with protection plate (13) inside.

4. The safety protection device for the operating port of a hydropower station according to claim 1, characterized in that: The blocking block (20) is slidably connected to the inside of the thin shell (19), the blocking block (20) is slidably connected to the inside of the thin shell (18), the baffle (23) is slidably connected to the inner wall of the thin shell (18).

5. A safety device for the operating port of a hydroelectric power station according to claim 1, characterized in that: One end of the spring (22) is fixedly connected to the inner wall of the thin shell (18), the other end of the spring (22) is fixedly connected to the outside of the baffle (23).

6. A safety device for the operating port of a hydroelectric power station according to claim 1, characterized in that: The slide rod (17) is provided with a plurality of clamping grooves (14) inside, the plug-in rod (21) is inserted into one of the clamping grooves (14) outside.

7. A safety device for the operating port of a hydroelectric power station according to claim 3, characterized in that: The mobile shell (7) is slidably connected to the inside of the support column (301), the protection plate (13) is slidably connected to the inside of the support column (301).

8. A safety device for the operating port of a hydroelectric power station according to claim 3, characterized in that: The rotating shaft (9) is rotatably connected outside the support column (301), and the rack (8) is slidably connected inside the support column (301).