Connecting device for newly-added elevator structure and original building
By using sliding and limiting components in the connection between the new elevator structure and the original building, adaptive adjustment and stable connection were achieved, solving the stress concentration problem caused by uneven settlement and ensuring the safety of the structure and construction efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-03-20
AI Technical Summary
When a new elevator structure is connected to the original building, existing technologies are insufficient to effectively eliminate the stress caused by uneven settlement, which affects the safety and stability of the original building.
The combination of sliding components and limiting components ensures the stability and safety of the connection. The sliding components achieve adaptive adjustment through guides and grooves, while the limiting components prevent the sliding components from dislodging.
This effectively avoids stress concentration, ensures the safety of the new elevator structure and the original building, simplifies the construction process, and reduces costs and time.
Smart Images
Figure CN224016519U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to building technical field, concretely relates to a new elevator structure and original building connecting device. BACKGROUND
[0002] With the development of society and the improvement of people's life demand, the new elevator structure needs to be added in many existing buildings to improve the vertical traffic condition. However, when the new elevator structure is connected with the original building structure, many challenges are faced, such as how to ensure the stability and reliability of the connection, and at the same time, how to minimize the influence on the original building main structure.
[0003] When the elevator is installed outside the existing building, the length and width of the installed elevator structure plane are usually small and the height is high, and the horizontal lateral stiffness is weak. When the installed elevator structure is connected with the original building main structure, the original structure can provide effective lateral support for the installed part, thereby reducing the horizontal displacement of the installed part. However, in the existing connection mode, the stress generated between the new elevator structure and the original building due to uneven settlement and other reasons cannot be well eliminated, thereby affecting the safety of the original building. SUMMARY
[0004] The utility model embodiment provides a new elevator structure and original building connecting device to solve the technical problem of uneven settlement between the new elevator structure and the original building in the prior art.
[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a new elevator structure and original building connecting device, comprising:
[0006] The sliding assembly is arranged between the steel beam of the new elevator structure and the concrete beam of the original building. The sliding assembly comprises a guide piece and a sliding piece. The guide piece is arranged vertically and is installed on the concrete beam. The sliding piece is fixedly connected with the steel beam, and a sliding groove is formed in the guide piece and is in sliding fit with the sliding piece. The length of the sliding groove is greater than the length of the sliding piece.
[0007] The limiting assembly is arranged on the guide piece. The limiting assembly comprises an upper baffle and a lower baffle. The upper baffle and the lower baffle are arranged at the upper and lower ends of the sliding groove respectively, and are used to limit the sliding piece from sliding out of the sliding groove.
[0008] In a possible implementation manner, the cross section of the sliding piece is I-shaped, and the sliding groove is in sliding fit with the sliding piece.
[0009] In a possible implementation manner, the lower baffle is integrally formed with the guide piece.
[0010] In a possible implementation, the guide is provided with an anchor plate near one side of the concrete beam; the anchor plate is fixed to the concrete beam by bolts, and the guide is fixedly connected with the anchor plate.
[0011] In a possible implementation, the sliding member is provided with a beam end sealing plate near one side of the steel beam; the beam end sealing plate is fixedly welded to the steel beam, and the sliding member is fixedly connected with the beam end sealing plate.
[0012] In a possible implementation, the sliding member is provided with an inverted slope.
[0013] In a possible implementation, the sliding groove is provided with a buffer assembly; the buffer assembly is connected with the lower baffle at the lower end and contacts the lower end surface of the sliding member at the upper end, and is used for buffering the settlement stress.
[0014] In a possible implementation, the buffer assembly comprises a first buffer member and a second buffer member; the first buffer member is arranged above the second buffer member, and the first buffer member is connected with the second buffer member at the lower end and contacts the sliding member at the upper end.
[0015] In a possible implementation, the first buffer member comprises an outer shell, a plurality of elastic members, an intermediate buffer layer, an elastic arm and a support ball; the outer shell is connected with the second buffer member at the lower end and contacts the sliding member at the upper end; the intermediate buffer layer is arranged in the outer shell; the plurality of elastic members are arranged around the outer surface of the intermediate buffer layer and are connected with the outer shell and the intermediate buffer layer at both ends; the support ball is arranged in the intermediate buffer layer; the plurality of elastic arms are arranged around the outer surface of the support ball and are connected with the support ball and the intermediate buffer layer at both ends; the plurality of elastic members and the plurality of elastic arms are arranged in a staggered manner.
[0016] In a possible implementation, the second buffer member comprises a buffer body and an elastic fiber; the buffer body is connected with the first buffer member at the upper end and is connected with the lower baffle at the lower end; the buffer body is provided with a plurality of honeycomb holes at the upper end; and the elastic fiber is arranged in the plurality of holes.
[0017] The beneficial effect of the novel elevator structure and the original building connecting device is that, compared with the prior art, the novel elevator structure and the original building connecting device, when in use, the guide piece of the sliding assembly is vertically installed on the concrete beam of the original building, and the sliding piece is fixedly connected with the steel beam of the novel elevator structure, and the sliding groove is provided on the guide piece and is in sliding fit connection with the sliding piece, and the length of the sliding groove 111 is greater than the length of the sliding piece, so that when the novel elevator structure is settled and vertically displaced, the novel elevator structure can be self-adaptively adjusted by sliding in the sliding groove of the guide piece, so that stress concentration caused by rigid connection is avoided, and the safety of the novel elevator structure and the original building structure is ensured; the upper baffle and the lower baffle of the limiting assembly are arranged at two ends of the sliding groove, so that the excessive movement of the sliding piece is limited, and stable boundary conditions are provided for the whole connecting device. Once the novel elevator structure is abnormally and greatly displaced, such as in an extreme condition of earthquake, the upper baffle and the lower baffle can prevent the sliding piece from being separated from the sliding groove, and the phenomenon that the novel elevator structure is separated from the original building and collapses is avoided; from the perspective of installation, the connecting device has a simple structure and is easy to install. The construction personnel complete the work of fixing the sliding piece on the steel beam and fixing the guide piece on the concrete beam in advance, then install the sliding piece in the sliding groove at the construction site, and finally fix the upper baffle and the lower baffle at two ends of the sliding groove. The connecting device has small installation workload, high construction precision, effectively shortens the construction period, and reduces the construction cost. In this way, when the novel elevator structure is settled, the novel elevator structure can be self-adaptively adjusted by sliding in the sliding groove of the guide piece, so that stress concentration caused by rigid connection is avoided, and the safety of the novel elevator structure and the original building structure is ensured; the limiting assembly is used to prevent the sliding piece from being separated from the sliding groove, so that the connecting device is not failed, and the novel elevator structure has the advantages of simple structure and convenient installation. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating labor.
[0019] Figure 1 The original building, the novel elevator structure and the connecting device provided by the embodiments of the present application are connected Figure 1 ;
[0020] Figure 2 The original building, the novel elevator structure and the connecting device provided by the embodiments of the present application are connected Figure 2 ;
[0021] Figure 3 A top view of the connecting device provided by the embodiment of the present application is shown in the figure.
[0022] Figure 4 A structure schematic view of the connecting device provided by the embodiment of the present application is shown in the figure.
[0023] Figure 5 A structure schematic view of the buffer assembly provided by the embodiment of the present application is shown in the figure.
[0024] In the figure, various reference signs are as follows:
[0025] 1, sliding assembly; 11, guide; 111, sliding groove; 12, sliding piece; 121, inverted slope; 2, limiting assembly; 21, upper baffle; 22, lower baffle; 3, steel beam; 31, beam end sealing plate; 4, concrete beam; 41, anchor plate; 5, buffer assembly; 51, first buffer piece; 511, outer shell; 512, elastic piece; 513, middle buffer layer; 514, elastic arm; 515, supporting ball; 52, second buffer piece; 521, buffer body; 522, elastic fiber; 523, hole. DETAILED DESCRIPTION
[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear and understandable, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.
[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0029] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0030] Please refer to Figures 1 to 5 The present application provides a new elevator structure and the original building connecting device. A new elevator structure and the original building connecting device, comprising a sliding assembly 1 and a limiting assembly 2; sliding assembly 1 is arranged between the steel beam 3 of the new elevator structure and the concrete beam 4 of the original building; sliding assembly 1 includes a guide 11 and a sliding piece 12; the guide 11 is arranged vertically and installed on the concrete beam 4; the sliding piece 12 is fixedly connected with the steel beam 3, and the guide 11 is provided with a sliding groove 111 connected with the sliding piece 12 in sliding mode; the length of the sliding groove 111 is greater than the length of the sliding piece 12; the limiting assembly 2 is arranged on the guide 11; the limiting assembly 2 includes an upper baffle 21 and a lower baffle 22, the upper baffle 21 and the lower baffle 22 are arranged at the upper and lower ends of the sliding groove 111 respectively, and are used for limiting the sliding piece 12 from sliding out of the sliding groove 111.
[0031] The embodiment provides the new elevator structure and original building connecting device, compared with the prior art, the new elevator structure and original building connecting device of the utility model, when in use, since the guide piece 11 of the sliding assembly 1 is vertically installed on the concrete beam 4 of the original building, and the sliding piece 12 is fixedly connected with the steel beam 3 of the new elevator structure, meanwhile, the sliding groove 111 of the guide piece 11 is provided with the sliding fit connection with the sliding piece 12, and the length of the sliding groove 111 is greater than the length of the sliding piece 12, therefore, when the new elevator structure occurs settlement and generates vertical displacement, the new elevator structure can be self-adaptively adjusted by sliding in the sliding groove 111 of the guide piece 11 through the sliding piece 12, so that stress concentration caused by rigid connection is avoided, and the safety of the new elevator structure and the original building structure is guaranteed; since the upper baffle 21 and the lower baffle 22 of the limiting assembly 2 are respectively arranged at both ends of the sliding groove 111, the excessive movement of the sliding piece 12 is limited, and meanwhile, stable boundary conditions are provided for the whole connecting device. Once the new elevator structure occurs abnormal large displacement, such as extreme conditions like earthquake, the upper baffle 21 and the lower baffle 22 can prevent the sliding piece 12 from being separated from the sliding groove 111, and the phenomenon that the new elevator structure is separated from the original building is avoided; from the installation point of view, the connecting device has simple structure and is easy to construct and install. The construction personnel pre-completes the work that the sliding piece 12 is fixed on the steel beam 3 and the guide piece 11 is fixed on the concrete beam 4, then installs the sliding piece 12 in the sliding groove 111 at the construction site, and finally fixes the upper baffle 21 and the lower baffle 22 at both ends of the sliding groove 111. The connecting device has small installation workload, high construction precision, effectively shortens the construction period and reduces the construction cost. Through the mode, when the new elevator structure occurs settlement, the new elevator structure can be self-adaptively adjusted by sliding in the sliding groove 111 of the guide piece 11 through the sliding piece 12, so that the structural stress concentration caused by rigid connection is avoided, and the safety of the new elevator structure and the original building structure is guaranteed; the limiting assembly 2 is used to prevent the sliding piece 12 from separating from the sliding groove 111, so that the connecting device is failed, and the utility model has simple structure and is convenient to install.
[0032] Please refer to Figure 1 and Figure 3As a specific embodiment of the novel elevator structure and original building connecting device provided by the utility model, the cross section of the sliding member 12 is I-shaped; the sliding groove 111 is matched with the sliding member 12 to slide; by means of the I-shaped structure of the sliding member 12 and the sliding groove 111, the sliding member 12 can not only bear the transverse tension, but also can ensure the stable movement of the sliding member 12 in the sliding groove 111; meanwhile, the I-shaped structure has certain advantages in installation, the I-shaped sliding member 12 and the sliding groove 111 can be conveniently butt-jointed and installed, and the error in the installation process is reduced. In the long-term use process, even if affected by external environmental factors, such as slight vibration or temperature change, due to the stable structure characteristics, the deformation or jamming phenomenon will not easily occur.
[0033] Please refer to Figure 2 and Figure 3 As a specific embodiment of the novel elevator structure and original building connecting device provided by the utility model, the lower baffle 22 is integrally formed with the guide member 11; in the stability aspect, the integral forming avoids the possible shaking due to the loosening of the connecting part, and can ensure the stability of the overall structure in the static or dynamic working environment. In the manufacturing process aspect, the integral forming technology not only reduces the assembly process, reduces the defective rate caused by the assembly error, but also improves the material utilization efficiency, reduces the additional material required by the connecting part, thereby reducing the cost. Moreover, the lower baffle 22 and the guide member 11 after the integral forming are more simple and smooth in appearance, and have no splicing traces. In the later maintenance aspect, since there is no wear, corrosion and other problems of the connecting part, the maintenance workload and cost are also greatly reduced. The upper baffle 21 is welded and fixed with the sliding groove 111. The lower baffle 22 and the entire guide member 11 are integrally formed, so that the construction and installation are convenient, and the buffer assembly 5 can be conveniently installed in the factory, the on-site construction work is reduced, and the construction quality is ensured.
[0034] Please refer to Figures 1 to 3As a specific embodiment of the original building connecting device of the new elevator structure provided by the utility model, the guiding piece 11 is provided with an anchor plate 41 on one side close to the concrete beam 4; the anchor plate 41 is fixed on the concrete beam 4 through bolts, and the guiding piece 11 is fixedly connected with the anchor plate 41; this setting mode can effectively ensure the stability of the guiding piece 11 on the concrete beam 4. On one hand, the anchor plate 41 is stably installed on the concrete beam 4 through bolts, and the fastening force of the bolts can resist various forces that the guiding piece 11 may suffer in the use process, such as tension, pressure or friction and the like. On the other hand, the guiding piece 11 is welded with the anchor plate 41, and this direct connecting mode makes the position of the guiding piece 11 relatively fixed and not easily displaced. This is very important for the whole structure system, because the stability of the guiding piece 11 directly affects the working performance of other components associated therewith. Moreover, in the long-term use process, even if affected by external environmental factors such as vibration, temperature change and the like, this stable connecting structure can maintain good integrity, reduce maintenance cost and improve the service life of the structure.
[0035] Please refer to Figures 1 to 3 As a specific embodiment of the original building connecting device of the new elevator structure provided by the utility model, the sliding piece 12 is provided with a beam end sealing plate 31 on one side close to the steel beam 3, the beam end sealing plate 31 is welded and fixed with the steel beam 3, and the sliding piece 12 is fixedly connected with the beam end sealing plate 31; the setting of the beam end sealing plate 31 effectively enhances the stability of the connection between the sliding piece 12 and the steel beam 3. Meanwhile, welding as a kind of fixed connecting mode can bear larger external force, and ensures that the whole structure remains stable in the long-term use. In the actual engineering application, this connecting structure has undergone strict tests and inspections, and can meet the corresponding mechanical requirements under both static load and dynamic load conditions. In addition, the selection of the welding process is very important, and appropriate welding materials and welding parameters need to be selected according to the material quality of the steel beam 3, the beam end sealing plate 31 and the sliding piece 12, so as to ensure that the welding quality is in the optimal state, thereby further improving the reliability and safety of the structure connection.
[0036] Please refer to Figure 1 As a specific embodiment of the original building connecting device of the new elevator structure provided by the utility model, the sliding piece 12 is provided with an inverted slope 121; by means of the inverted slope 121, the sliding piece 12 can be conveniently installed into the sliding groove 111, and the sliding piece 12 can also effectively avoid scratching the workers in the installation process.
[0037] Please refer to Figure 4 and Figure 5As a specific embodiment of the original building connecting device of the new elevator structure provided by the utility model, the chute 111 is provided with a buffer assembly 5; the lower end of the buffer assembly 5 is connected with the lower baffle 22, and the upper end is in contact with the lower end face of the sliding piece 12, for buffering the settlement stress; in the use process of the new elevator structure, the settlement stress is inevitable. When the new elevator structure produces settlement, the buffer assembly 5 plays a good buffering role. The lower baffle 22 is connected with the lower end of the buffer assembly 5, and it can stably bear the pressure from the upper side under the action of the buffer assembly 5, avoiding damage due to sudden pressure. At the same time, the setting of the buffer assembly 5 can also play the role of positioning the sliding piece 12, avoiding that the sliding piece 12 directly falls on the lower baffle 22 during installation.
[0038] Please refer to Figure 4 and Figure 5 As a specific embodiment of the original building connecting device of the new elevator structure provided by the utility model, the buffer assembly 5 includes a first buffer piece 51 and a second buffer piece 52, the first buffer piece 51 is arranged above the second buffer piece 52, and the lower end of the first buffer piece 51 is connected with the upper end of the second buffer piece 52, and the upper end is in contact with the sliding piece 12; when the sliding piece 12 moves due to the settlement of the new elevator structure, the buffer assembly 5 bears the pressure from the upper side, first, the first buffer piece 51 performs preliminary buffering, the first buffer piece 51 elastically deforms to absorb part of the energy, the remaining energy is transmitted to the second buffer piece 52, the second buffer piece 52 buffers again, and the settlement stress is further weakened. Thus, the connecting device is better protected, and damage is avoided.
[0039] Please refer to Figure 4 and Figure 5, as a specific embodiment of the utility model provides a new elevator structure and the original building connecting device, first buffer piece 51 includes outer shell 511, a plurality of elastic piece 512, intermediate buffer layer 513, elastic arm 514 and support ball 515, outer shell 511 lower end is connected with second buffer piece 52, and upper end is contacted with sliding part 12, intermediate buffer layer 513 is located in outer shell 511, a plurality of elastic piece 512 is arranged around the outer surface of intermediate buffer layer 513, and both ends are connected with outer shell 511 and intermediate buffer layer 513 respectively, support ball 515 is located in intermediate buffer layer 513, a plurality of elastic arm 514 is arranged around the outer surface of support ball 515, and both ends are connected with support ball 515 and intermediate buffer layer 513 respectively, a plurality of elastic piece 512 and a plurality of elastic arm 514 are staggered arrangement, outer shell 511 is spherical structure, and intermediate buffer layer 513 is rubber material, when first buffer piece 51 is subjected to settlement stress, outer shell 511 first elastically deforms and extrudes elastic piece 512, makes intermediate buffer layer 513 connected with elastic piece 512 elastically deformed, and then makes elastic arm 514 elastically deformed, by this mode, settlement stress is gradually reduced, to reduce settlement stress, protects connecting device, a plurality of elastic piece 512 is arranged around the outer surface of intermediate buffer layer 513, can bear stress in different directions, and enhances buffering effect, support ball 515 is located inside intermediate buffer layer 513, and plays the role of core support, a plurality of elastic arm 514 is arranged around the outer surface of support ball 515, and is staggered with elastic piece 512, this layout can make first buffer piece 51 have good buffering performance in each direction, when settlement stress is transmitted to intermediate buffer layer 513, elastic arm 514 can be deformed according to the direction and size of force, and cooperates with elastic piece 512, to absorb and disperse energy to the maximum extent, avoids that connecting device is damaged, the spherical structure of outer shell 511 helps to bear pressure evenly from each direction, and the connection of second buffer piece 52 ensures the stability of buffer assembly 5, and the contact with sliding part 12 plays important buffering and supporting role, elastic piece 512 is spring.
[0040] Please refer to Figure 4 and Figure 5, as a specific embodiment of the utility model provides a new elevator structure and the connecting device of original building, second buffer piece 52 includes buffer body 521 and elastic fiber 522, buffer body 521 upper end is connected with first buffer piece 51, and lower end is connected with lower baffle 22;Buffer body 521 is opened with multiple honeycomb holes 523 on it;Elastic fiber 522 is arranged in multiple holes 523;When the stress on first buffer piece 51 acts on second buffer piece 52, buffer body 521 occurs elastic deformation and absorbs a part of energy, simultaneously extrudes the elastic fiber 522 in hole 523, so that elastic fiber 522 absorbs and disperses a part of energy again.Honeycomb structure's hole 523 can also effectively guide the transmission direction of pressure, so that pressure is evenly distributed on the whole buffer body 521, avoids the damage caused by local excessive stress.
[0041] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A connection device between a newly added elevator structure and the original building, characterized in that, include: A sliding assembly is located between the steel beams of the newly added elevator structure and the concrete beams of the original building; the sliding assembly includes a guide and a sliding component. The guide member is arranged vertically and installed on the concrete beam; the sliding member is fixedly connected to the steel beam, and the guide member has a sliding groove that is slidably connected to the sliding member; the length of the sliding groove is greater than the length of the sliding member. A limiting component is provided on the guide member; the limiting component includes an upper baffle and a lower baffle, the upper baffle and the lower baffle are respectively provided at the upper and lower ends of the slide groove, and are used to restrict the sliding member from sliding out of the slide groove.
2. The connection device between the newly added elevator structure and the original building as described in claim 1, characterized in that, The cross-section of the sliding member is I-shaped; the sliding groove cooperates with the sliding member to slide.
3. The connection device between the newly added elevator structure and the original building as described in claim 1, characterized in that, The lower baffle and the guide member are integrally formed.
4. The connection device between the newly added elevator structure and the original building as described in claim 1, characterized in that, An anchor plate is provided on the side of the guide member closest to the concrete beam; the anchor plate is fixed to the concrete beam by bolts, and the guide member is fixedly connected to the anchor plate.
5. The connection device between the newly added elevator structure and the original building as described in claim 1, characterized in that, The sliding member has a beam end sealing plate on the side near the steel beam. The beam end sealing plate is welded and fixed to the steel beam, and the sliding member is fixedly connected to the beam end sealing plate.
6. The connection device between the newly added elevator structure and the original building as described in claim 1, characterized in that, The sliding component has a beveled surface.
7. The connection device between the newly added elevator structure and the original building as described in claim 1, characterized in that, The chute is equipped with a buffer assembly; the lower end of the buffer assembly is connected to the lower baffle, and the upper end is in contact with the lower end face of the sliding member, which is used to buffer settlement stress.
8. The connection device between the newly added elevator structure and the original building as described in claim 7, characterized in that, The buffer assembly includes a first buffer and a second buffer. The first buffer is disposed above the second buffer, and the lower end of the first buffer is connected to the upper end of the second buffer, while the upper end is in contact with the sliding member.
9. The connection device between the newly added elevator structure and the original building as described in claim 8, characterized in that, The first buffer includes an outer shell, multiple elastic elements, an intermediate buffer layer, elastic arms, and a support ball; the lower end of the outer shell is connected to the second buffer, and the upper end is in contact with the sliding element; the intermediate buffer layer is disposed inside the outer shell; the multiple elastic elements are arranged around the outer surface of the intermediate buffer layer, and their two ends are respectively connected to the outer shell and the intermediate buffer layer; the support ball is disposed inside the intermediate buffer layer; the multiple elastic arms are arranged around the outer surface of the support ball, and their two ends are respectively connected to the support ball and the intermediate buffer layer; the multiple elastic elements and the multiple elastic arms are staggered.
10. The connection device between the newly added elevator structure and the original building as described in claim 8, characterized in that, The second buffer includes a buffer body and elastic fibers. The upper end of the buffer body is connected to the first buffer, and the lower end is connected to the lower baffle. The buffer body has multiple honeycomb-shaped holes. The elastic fibers are disposed in the multiple holes.