Front sealing plate connecting structure of elevator shaft

A rigid support structure with U-shaped decorative strips and adjustable gaps addresses instability and aesthetic issues in elevator shaft panels, ensuring stability and ease of maintenance, enhancing user comfort and appearance.

CN223104046UActive Publication Date: 2025-07-15NINGBO HONGWEI ELEVATOR CO LTD
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Patent Information

Application Number
CN202422119497.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-30
Publication Date
2025-07-15
Estimated Expiration
2034-08-30

AI Technical Summary

Technical Problem

The front sealing plate of the existing household elevator shaft is prone to shake when it is high, resulting in insufficient noise and aesthetics, and inconvenient maintenance.

Method used

The supporting frame structure is used to connect to the sealing plate, and the upper and lower ends of the supporting frame are connected to the shaft frame. The sealing plate is fixed by U-shaped decorative strips and locking components. The locking components are operated through clearance during maintenance. The supporting base can be removed after the decorative strips are removed.

Benefits of technology

Improves the stability and aesthetics of the sealing plate, avoids shaking and collision, improves user comfort, and simplifies the maintenance process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides an elevator shaft front sealing plate connecting structure which comprises a supporting frame and a plurality of sealing plates, the supporting frame is vertically connected to a shaft frame, the sealing plates are sequentially connected to the supporting frame, the bottom end of the supporting frame is connected with a supporting base, and the lower end of the sealing plate at the lowest end abuts against the supporting base. Decorative strips with U-shaped cross sections are arranged on the left side and the right side of the sealing plate, U-shaped notches in the bottom ends of the decorative strips are clamped to the two ends of the sealing plate and the two ends of the supporting base respectively, and the decorative strips are fixedly connected with the sealing plate through a plurality of locking assemblies. Frame rear stand columns are further arranged on the left side and the right side of the sealing plate, gaps are reserved between the two frame rear stand columns and the two sides of the sealing plate respectively, the gaps can be used for fingers of a maintainer or a maintenance tool to stretch into so as to operate the locking assembly, and finally easy disassembly of the decoration strip is achieved. The utility model provides an elevator shaft front sealing plate connecting structure which can ensure that a sealing plate is stable in structure and free of shaking after being connected, and the sealing plate structure is attractive in appearance and convenient to overhaul.
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Description

Technical Field

[0001] The utility model relates to the technical field of domestic elevator shafts, and particularly relates to a connecting structure of a front sealing plate of an elevator shaft. Background Art

[0002] In the existing domestic platform elevator structure, in order to increase the aesthetic degree inside the elevator, a corresponding decorative sealing plate is usually used to cover one side of the inner cavity of the shaft frame close to the driving component, so that when a user stands on the platform, the driving component cannot be seen.

[0003] At present, some elevator manufacturers fix the sealing plate in the following way: two steel wires are arranged at both ends of one side of the shaft frame close to the driving component, then a corresponding connecting bracket is sleeved outside the steel wires, and finally a plurality of sealing plates are sequentially fixed on the connecting brackets on both sides. In this structure, when the overall height of the elevator is relatively high, the steel wire is a flexible structure, especially when the length is relatively long. Even if it is straightened and tightened during installation, the connecting brackets and the sealing plate structure installed in the middle position will still shake under the action of vibration during the operation of the elevator. At this time, if the distance between the sealing plate and the manned platform of the platform elevator is relatively small, there will be a risk of collision interference, and even noise will be generated, thus affecting the normal use of the elevator and reducing the comfort of users.

[0004] On the other hand, in the connecting structure of the front sealing plate of the existing technology, after a plurality of sealing plates are vertically connected, both sides in the width direction are directly exposed. Since both ends of the sealing plate are generally cutting surfaces and it is impossible to achieve absolute flatness during manual cutting, it is difficult to make the two sides of the front sealing plate neat and flat from top to bottom after connection, resulting in insufficient overall aesthetic degree of the front sealing plate. Content of the Utility Model

[0005] The problem solved by the utility model is to provide a connecting structure of a front sealing plate of an elevator shaft, which can ensure the stability of the structure after the sealing plate is connected, without shaking, and has a beautiful appearance and convenient maintenance of the sealing plate structure in order to overcome at least one defect in the prior art.

[0006] To solve the above problems, the present utility model provides a connection structure for the front sealing plate of an elevator hoistway, which includes a support frame and multiple sealing plates. The upper and lower ends of the support frame are respectively connected to the hoistway frame. The multiple sealing plates are sequentially connected to the front end of the support frame from bottom to top. Moreover, a support base is detachably connected to the bottom end of the support frame, and the lower end of the lowermost sealing plate abuts against the support base. Decorative strips with a U-shaped cross-section are provided on both the left and right sides of the sealing plate. The U-shaped slots of each decorative strip are respectively clamped on both ends of the sealing plate. Both ends of the support base are respectively accommodated in the slots of the decorative strips on both sides. A plurality of locking components arranged vertically are provided on the rear side plates of each decorative strip for connecting and locking to the sealing plate. Frame rear columns are also provided on both the left and right sides of the sealing plate. A gap is respectively reserved between the two frame rear columns and both sides of the sealing plate, and the gap can allow maintenance personnel's fingers or maintenance tools to extend in to operate the locking components.

[0007] The installation structure of the front sealing plate of the elevator hoistway of the present utility model has the following advantages compared with the prior art:

[0008] In the sealing plate installation structure of the present utility model, a corresponding support frame structure is provided on one side of the inner cavity of the hoistway frame close to the driving component for installing the sealing plate. Moreover, both the upper and lower ends of the support frame in this structure are connected to the hoistway frame, that is, the support frame is a rigid structural member. After the sealing plate is installed later, during the operation of the elevator, the support columns can better maintain stability, avoid the risk of the sealing plate touching the manned platform, improve the user's comfort. In addition, the sealing plate connected to the rigid support frame of the structure can better ensure the structural stability. On the other hand, decorative strips are provided on both sides of the sealing plate, and the lower ends of the decorative strips extend to the support base to enhance the overall aesthetics. However, after such a setting, when removing the support base, the decorative strips need to be removed first. Since the decorative strips are connected and fixed to the sealing plate through the locking components, in the present utility model, a process gap is provided between both sides of the sealing plate and the two frame rear columns. During maintenance, maintenance personnel's fingers or maintenance tools extend into the gap to operate the locking components, so as to realize the disassembly of the decorative strips, and then remove the support base for the maintenance of the sealing plate, which is very convenient.

[0009] Further, the connection component includes a U-shaped clamping plate clamped on the rear side plate. One end of the U-shaped clamping plate close to the sealing plate is connected with a locking nut. The other end of the U-shaped clamping plate is provided with a connecting bolt passing through the sealing plate and fitted to the locking nut, and the end of the connecting bolt abuts against the rear side wall of the sealing plate.

[0010] Furthermore, the support frame includes multiple connecting columns, and the multiple connecting columns are axially connected to form at least one support column extending in the height direction of the shaft. Multiple said sealing plates are connected to the front wall of the support column; the lower end of the support column is connected to the bottom plate of the shaft frame, and the upper end of the support column is connected to the top of the shaft frame.

[0011] As an improvement, there are two support columns, and the two support columns are symmetrically connected to both sides of the shaft frame near one end of the drive assembly; there are multiple connecting crossbars spaced along the height direction between the two support columns, and multiple said sealing plates are respectively connected between adjacent two connecting crossbars.

[0012] Furthermore, the connecting crossbar includes a crossbar main body connected to the support column. On one side of each crossbar main body away from the support column, a horizontal partition is convexly provided. Plug-in protrusions are provided on both the upper and lower sides of the horizontal partition, and plug-in grooves matching the plug-in protrusions are provided at both the upper and lower ends of the sealing plate.

[0013] As a further improvement, the crossbar main body is connected to the support column by self-tapping screws, and an avoidance groove for accommodating the screw head of the self-tapping screw is provided on the crossbar main body.

[0014] As a further improvement, the support base includes a fixing plate. The two ends of the fixing plate are respectively detachably connected to the two support columns. An L-shaped support plate for the lower end of the lowermost sealing plate to abut and cooperate is provided at the upper end of the fixing plate, and the lower end of the fixing plate is bent forward to form a horizontal bottom plate.

[0015] Other improved features and advantages of the present utility model will be elaborated in the subsequent specific embodiments, and partly become obvious from the specification, or are understood by implementing the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the structures specifically pointed out in the specification and the drawings. Description of the Drawings

[0016] Figure 1 is a three-dimensional structure diagram of the front sealing plate connection structure of the elevator shaft of the present utility model;

[0017] Figure 2 is another three-dimensional structure diagram of the front sealing plate connection structure of the elevator shaft of the present utility model from another angle;

[0018] Figure 3 is a partial cross-sectional view of the front sealing plate connection structure of the elevator shaft of the present utility model;

[0019] Figure 4 is Figure 2 the enlarged structure diagram at the X position in

[0020] Figure 5 For Figure 2 the enlarged structural view at position Y in

[0021] Figure 6 This is a partial cross-sectional view of the connection structure between two adjacent sealing plates and the support column in the present utility model;

[0022] Figure 7 This is the left view of the connecting cross bar in the present utility model;

[0023] Figure 8 This is a partial cross-sectional view of the connection structure between the support base, the support column and the baffle in the present utility model.

[0024] Explanation of reference numerals:

[0025] 1. Sealing plate; 2. Support base; 3. Decorative strip; 4. Rear frame column; 5. Gap; 6. U-shaped clamping plate; 7. Locking nut; 8. Fastening bolt; 9. Connecting column; 10. Support column; 11. Connecting cross bar; 12. Cross bar body; 13. Horizontal partition; 14. Insertion protrusion; 15. Insertion groove; 16. Avoidance groove; 17. Fixed plate; 18. L-shaped support plate; 19. Horizontal bottom plate; 20. Intermediate connector; 21. Mounting plate; 22. Connecting bolt; 23. Self-tapping screw. Detailed implementation manners

[0026] First of all, those skilled in the art should understand that these implementation manners are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0027] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "fixed" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0028] The following further elaborates on the present application in detail with reference to the drawings and specific embodiments.

[0029] Refer to Figures 1 to 8As shown in the figure, an embodiment of the present application discloses a connection structure for the front sealing plate of an elevator hoistway. It includes a support frame and multiple sealing plates 1. The support frame is arranged inside the hoistway frame near the driving component side, and both the upper and lower ends of the support frame are fixedly connected to the hoistway frame. The multiple sealing plates 1 are sequentially installed on the end face of the support frame away from the driving component side from bottom to top to form a whole decorative sealing plate 1 assembly extending along the height direction of the hoistway frame, so as to block the driving component in the hoistway. Thus, when a user looks towards the driving component direction on the manned platform of the platform elevator, the specific structure of the driving component cannot be seen, ensuring good aesthetics inside the hoistway and improving the user's comfort level.

[0030] In addition, in this embodiment, a support base 2 is also detachably connected to the bottom end of the support frame. Referring to the attached Figure 8 It can be seen that the support base 2 includes a fixing plate 17. The two ends of the fixing plate 17 are respectively detachably connected to the support columns 10. An L-shaped support plate 18 is arranged at the upper end of the fixing plate 17. A positioning part for positioning the lower end of the bottommost sealing plate 1 is formed between the L-shaped support plate 18 and the front side wall of the support column 10. And the lower end of the fixing plate 17 is bent forward to form a horizontal bottom plate 19. The horizontal bottom plate 19 increases the contact area with the bottom of the hoistway frame, improving the support strength and stability. The lower end of the bottommost sealing plate 1 directly abuts against the positioning part. That is, when installing the sealing plates 1 after the support frame is fixed, first install the support base 2, and then install the sealing plates 1 one by one from bottom to top. In the above structure, when maintenance is required, the disassembly sequence is just the opposite, that is, first disassemble the support base 2, and then disassemble the bottommost sealing plate 1. In actual application, generally only the bottommost sealing plate 1 needs to be disassembled to vacate the maintenance space. In actual application, the component with the highest maintenance frequency or failure rate in the later stage is usually at the bottom position of the driving component at the rear side of the hoistway, that is, at the rear side position of the bottommost sealing plate. Therefore, the layout of the maintenance space here is very crucial.

[0031] On the other hand, referring to the attached Figure 3, in the above structure, decorative strips 3 with a U-shaped cross-section are provided on both the left and right sides of the multiple sealing plates 1. The U-shaped notches of the decorative strips 3 on both sides are respectively clamped at both ends of the sealing plate 1. Moreover, both ends of the support base 2 are respectively accommodated in the notches of the decorative strips 3 on both sides, that is, the lower ends of the decorative strips 3 simultaneously wrap and block the sealing plate 1 and the support base 2, effectively improving the overall aesthetics. More specifically, in this structure, a plurality of locking components arranged vertically and used for connecting and locking to the sealing plate 1 are provided on the rear side plates of the decorative strips 3; frame rear columns 4 are further provided on both the left and right sides of the sealing plate 1, and gaps 5 are respectively reserved between the two frame rear columns 4 and both sides of the sealing plate 1, and the gaps 5 can allow maintenance personnel's fingers or maintenance tools to extend in to operate the locking components, so as to realize the disassembly of the decorative strips 3. Because only by disassembling the decorative strips 3 can the support base 2 be disassembled, and then the lowermost sealing plate 1 be disassembled, the setting of the special gap 5 in this structure enables maintenance personnel's fingers or a right-angled ratchet wrench to directly operate the locking components through the gap 5 during maintenance, which is very convenient.

[0032] In this embodiment, continue to refer to the appendix Figure 3 , the locking component includes a U-shaped clamping plate 6 clamped on the rear side plate. One end of the U-shaped clamping plate 6 close to the sealing plate 1 is connected with a locking nut 7, and a fastening bolt 8 passes through the other end of the U-shaped clamping plate 6. Connecting through holes are respectively opened at positions on the sealing plate 1 corresponding to the fastening bolts 8. The fastening bolts 8 pass through the connecting through holes of the sealing plate 1 and are assembled to the locking nuts 7, and the ends of the fastening bolts 8 are abutted against the rear side wall of the sealing plate 1, so as to realize the connection and fixation of the decorative strip 3 and the sealing plate 1. More specifically, the decorative strips 3 on both sides of the sealing plate 1 are not integral either, but are assembled vertically by multiple pieces. Therefore, during later maintenance, only the fastening bolts 8 on the lowermost decorative strip 3 on both sides need to be unscrewed from the gaps 5 on both sides of the sealing plate 1 to disassemble the lowermost decorative strips 3 on both sides, and then the support base 2 is disassembled, and the lowermost sealing plate 1 can be removed to expose the maintenance space, and the maintenance is very convenient.

[0033] Specifically, refer to the appendix Figure 4, in this embodiment, the support frame includes multiple connecting columns 9. The multiple connecting columns 9 are axially connected to form at least one support column 10 extending in the height direction of the hoistway. Additionally, multiple sealing plates 1 are connected to the front wall of the support column 10. Specifically, the lower end of the support column 10 is connected to the bottom plate of the hoistway frame, and the upper end of the support column 10 is connected with a connecting component having a vertical tension force. The other end of the connecting component is connected to the mounting plate 21 at the top of the hoistway frame. After such a setting, when connecting and fixing the support column 10, first connect the lower end of the support column 10 to the bottom plate at the bottom of the hoistway frame, and then connect the connecting component. During the connection process, the connecting component has an upward pulling force along the vertical direction on the support column 10. Thus, when the upper end of the support column 10 is connected and fixed to the mounting plate 21 at the top of the hoistway frame, the support column 10 can better ensure linearity, and there is also a good pulling driving force at the connection of each connecting column 9, thereby ensuring the stability after the upper and lower ends of the support column 10 are connected. Therefore, after connecting multiple sealing plates 1 to the support column 10 one by one, good stability can also be maintained during the operation of the elevator, without shaking, improving the comfort of users. On the other hand, it also ensures that the sealing plate 1 will not contact the end of the elevator platform due to shaking, ensuring the safe operation of the elevator.

[0034] More specifically, refer to the appendix Figure 5 , in this embodiment, the connecting component includes a connecting bolt 22. The lower end of the connecting screw passes through the mounting plate 21 and is connected to the upper end of the support column 10. In the above structure, the mounting plate 21 can be directly mounted on the main machine base or the rope socket beam at the top of the hoistway frame. Of course, in some other embodiments, the connecting component can also be other types of structures. For example, a steel wire cable is connected to the top of the support column 10, and a jacking cylinder structure is connected to the mounting plate 21 at the top of the hoistway frame. The other end of the steel wire cable is connected to the jacking end of the jacking cylinder. Through the jacking action of the jacking cylinder, the steel wire cable is tensioned, so as to realize the vertical tension and limit of the upper end of the support column 10. The connecting component diagram of this structure is not shown in the figure.

[0035] In the above structure, in order to facilitate the disassembly and assembly between the connecting columns 9 that make up the support column 10 to be more convenient, and at the same time ensure the connection strength at the connection, refer to the appendix Figure 4 It can be seen that an intermediate connecting piece 20 is provided between every two adjacent connecting columns 9, and both ends of the intermediate connecting piece 20 are detachably connected to the two adjacent connecting columns 9 respectively through connecting bolts 22.

[0036] In this embodiment, preferably, refer to the appendix Figure 2, there are two support columns 10, and the two support columns 10 are symmetrically connected to both sides of the inner side of the hoistway frame near the drive assembly; there are multiple connecting crossbars 11 distributed at intervals along the height direction between the two support columns 10, and multiple sealing plates 1 are respectively connected between two adjacent connecting crossbars 11, which facilitates the connection of the sealing plates 1 and at the same time ensures the structural stability after the connection of the sealing plates 1.

[0037] Specifically, see the appendix Figure 6 , 7 , the connecting crossbar 11 includes a crossbar main body 12 connected to the support column 10. On the outer wall of the crossbar main body 12 away from the support column 10, there is a partition extending in the horizontal direction, and insertion protrusions 14 are provided on both the upper and lower sides of the partition. Correspondingly, insertion grooves 15 matching the insertion protrusions 14 are provided at both the upper and lower ends of the sealing plate 11. Specifically, in this structure, in order to further ensure the aesthetics after the connection of multiple sealing plates 1, the height of the partition protruding outward in the horizontal direction in this structure is the same as the thickness of the sealing plate 1. Thus, when each sealing plate 1 is connected and fitted between two corresponding connecting crossbars 11, the outer side walls of the multiple sealing plates 1 and the outer side wall of the partition form a complete and flush end face, ensuring the aesthetics.

[0038] In this structure, in order to facilitate the installation of each sealing plate 1, the installation steps from bottom to top are selected, that is, first install the support base 2 at the lower ends of the two support columns 10, and then start installing the first sealing plate 1. Fit the insertion at the lower end of the sealing plate 1 on the positioning part formed between the support base 2 and the front walls of the two support columns 10, and then continue to install the first connecting crossbar 11. Before connecting this connecting crossbar 11, ensure that the insertion protrusion 14 extending downward on its partition is inserted and fitted in the insertion groove 15 at the upper end of the first sealing plate 1. Repeat the installation steps from bottom to top in this way to realize the installation and fixation of all the sealing plates 1 and connecting crossbars 11 in the height direction of the entire hoistway frame.

[0039] In the above structure, for the convenience of installation, see the appendix Figure 6 , 7 , the crossbar main body 12 and the support column 10 are connected by self-tapping screws 23, and an avoidance groove 16 for accommodating the screw head of the self-tapping screw 23 is provided at one end of the crossbar main body 12 in the width direction. After such a setting, when both ends of the connecting crossbar 11 are respectively connected and fixed to the two support columns 10, when installing the sealing plate 1, the rear side of the sealing plate 1 will not interfere with the self-tapping screws 23, ensuring the flatness of the sealing plate 1.

[0040] In the description of the present application, the descriptions referring to terms such as "this embodiment", "some embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0041] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An elevator hoistway front sealing plate connection structure, characterized in that: It includes a support frame and multiple sealing plates (1). The upper and lower ends of the support frame are respectively connected to the hoistway frame. The multiple sealing plates (1) are sequentially connected to the front end of the support frame from bottom to top. And a support base (2) is detachably connected to the bottom end of the support frame. The lower end of the lowermost sealing plate (1) abuts against the support base (2). Decorative strips (3) with a U-shaped cross-section are arranged on both the left and right sides of the sealing plate (1). The U-shaped notches of each decorative strip (3) are respectively clamped at both ends of the sealing plate (1). Both ends of the support base (2) are respectively accommodated in the notches of the decorative strips (3) on both sides. Multiple locking components arranged vertically are provided on the rear side plates of each decorative strip (3) and are used for connecting and locking to the sealing plate (1). Frame rear columns (4) are also arranged on both the left and right sides of the sealing plate (1). And gaps (5) are respectively reserved between the two frame rear columns (4) and the two sides of the sealing plate (1). And the gaps (5) can allow maintenance personnel's fingers or maintenance tools to extend in to operate the locking components.

2. The connection structure of the front sealing plate of the elevator shaft according to claim 1, characterized in that: The locking component includes a U-shaped clamping plate (6) clamped on the rear side plate. A locking nut (7) is connected to one end of the U-shaped clamping plate (6) close to the sealing plate (1). A fastening bolt (8) passes through the other end of the U-shaped clamping plate (6). The fastening bolt (8) passes through the sealing plate (1) and is fitted to the locking nut (7). And the end of the fastening bolt (8) abuts against the rear side wall of the sealing plate (1).

3. The connection structure of the front sealing plate of the elevator hoistway according to claim 1, characterized in that: The support frame includes multiple connecting columns (9). The multiple connecting columns (9) are axially connected to form at least one support column (10) extending along the hoistway height direction. The multiple sealing plates (1) are connected to the front wall of the support column (10). The lower end of the support column (10) is connected to the bottom plate of the hoistway frame. The upper end of the support column (10) is connected to the top of the hoistway frame.

4. The connection structure of the front seal plate of the elevator hoistway according to claim 3, characterized in that: There are two support columns (10). And the two support columns (10) are symmetrically connected to both sides of the hoistway frame near one end of the drive assembly. Multiple connecting crossbars (11) are arranged at intervals along the height direction between the two support columns (10). The multiple sealing plates (1) are respectively connected between adjacent two connecting crossbars (11).

5. The connection structure of the front sealing plate of the elevator hoistway according to claim 4, wherein: The connecting crossbar (11) includes a crossbar main body (12) connected to the support column (10). A horizontal partition plate (13) protruding outward is provided on one side of each crossbar main body (12) away from the support column (10). Plugging protrusions (14) are provided on both the upper and lower sides of the horizontal partition plate (13). Plugging grooves (15) matching with the plugging protrusions (14) are provided at both the upper and lower ends of the sealing plate (1).

6. The connection structure of the front sealing plate of the elevator hoistway according to claim 5, characterized in that: The crossbar main body (12) is connected to the support column (10) by self-tapping screws (23). And an avoidance groove (16) for accommodating the screw head of the self-tapping screw (23) is provided on the crossbar main body (12).

7. The connecting structure of the front sealing plate of the elevator hoistway according to claim 4, wherein: The support base (2) includes a fixing plate (17), both ends of the fixing plate (17) are detachably connected to the two support columns (10) respectively, an L-shaped support plate (18) is arranged at the upper end of the fixing plate (17), a positioning part for positioning the lower end of the bottommost sealing plate (1) in terms of phase is formed between the L-shaped support plate (18) and the front side walls of the two support columns (10), and the lower end of the fixing plate (17) is bent forward to form a horizontal bottom plate (19).