arbor house
Patent Information
- Application Number
- CN202522430959.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-17
AI Technical Summary
[0006]本实用新型的目的是提供葡萄架花房,以解决现有园林设施存在的功能单一性,多种设施空间利用率低的技术缺陷
[0020]相比于现有技术,本实用新型提供的葡萄架花房具有以下有益效果:将花房构架与葡萄构架的模块化衔接,实现多区域划分,攀爬架与主框架连接可延伸至主顶架,形成藤蔓种植与花卉培育的复合空间,相比传统独立设置,占地面积少,空间利用率高,满足多样化的园艺需求;攀爬架下方、门框前方以及主框架之间形成的人行通道满足日常出入需求,亦可通过空间分割实现“花房内部培育区”与“藤蔓攀爬区”的划分,提升使用便捷性,形成兼具实用性、景观性与生态性的园艺设施。
Smart Images

Figure CN224891381U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of greenhouse technology, specifically relating to a grape trellis greenhouse. Background Technology
[0002] Grape trellises are structures built to support the growth of grape seedlings. They are mainly achieved through structures such as trellises and pergolas, using a variety of materials, and taking into account factors such as light exposure, stability, and the climbing needs of the vines.
[0003] Greenhouses are positioned with flowers as their core function and usually adopt an open or semi-open structure.
[0004] In existing garden facilities, traditional grape trellises only serve the function of grape cultivation, resulting in low space utilization efficiency; while independent greenhouses, although able to meet the needs of flower cultivation and appreciation, suffer from problems such as large land area and redundant resource allocation.
[0005] With the increasing demand for a high-quality life, the market urgently needs comprehensive facilities that can integrate grape cultivation and flower cultivation to improve space utilization, reduce construction costs, and enrich the user experience, thereby meeting the urgent need for multifunctional leisure planting spaces. Utility Model Content
[0006] The purpose of this utility model is to provide a grape trellis greenhouse to solve the technical defects of existing garden facilities, such as the single function and low space utilization of various facilities.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A grape trellis greenhouse includes a semi-open greenhouse frame with a grape trellis at the front for the grapevines to climb.
[0009] The greenhouse structure includes a main frame, a main roof frame at the top of the main frame, and a door frame at the front end of the main frame.
[0010] The grape trellis includes two support frames symmetrically arranged about the center line of the door frame. A climbing frame that can be connected to the main frame is provided between the two support frames. A pedestrian passage is formed under the climbing frame, between the door frame and the main frame.
[0011] As a further embodiment of this utility model, the main frame includes four columns A arranged in a rectangular array. There is an upper horizontal bar between the upper ends of two adjacent columns A, and a barrier A is provided between the lower ends of two adjacent columns A. There are two symmetrically arranged barriers B between the lower ends of two adjacent columns A where the door frame is located. A door frame is formed between the two barriers B. The door frame is installed on the door frame by hinges. The support frame is arranged opposite to the barriers B, and the climbing frame is installed on the corresponding upper horizontal bar at the upper end of the door frame.
[0012] As a further embodiment of this utility model, fence A and fence B have the same structure but different positions, and both include a reinforcing rod and a lower horizontal bar arranged vertically. The two ends of the reinforcing rod are fixedly connected to the lower middle part of the corresponding column A, and the two ends of the lower horizontal bar are fixedly connected to the bottom of the corresponding column A. The lower horizontal bar, the reinforcing rod and the corresponding upper horizontal bar are all fixedly connected to a reinforcing column arranged parallel to each other with the column A. The door frame is hinged to the front end of the reinforcing column through a hinge.
[0013] As a further embodiment of this utility model, a baffle is provided between the reinforcing rod and the lower crossbar, and a support plate is provided on the inner side of the adjacent reinforcing rod. A support rod perpendicular to the support plate is provided at the bottom of the support plate corresponding to the reinforcing column and the reinforcing rod. An inclined brace is connected to the bottom of the support rod. The inclined brace and the reinforcing column are arranged in a one-to-one correspondence. The upper end of the inclined brace is connected to the corresponding support rod, and the lower end of the inclined brace is connected to the corresponding reinforcing column.
[0014] As a preferred embodiment of this utility model, a decorative panel is snapped between two adjacent reinforcing columns and between the reinforcing column and column A, and the bottom of the decorative panel is fixedly connected to the corresponding reinforcing rod.
[0015] As a preferred embodiment of this utility model, the main top frame also includes two inclined top frames respectively provided on the upper crossbar. The two inclined top frames are symmetrically arranged about the center line of the door frame. Trusses are provided on the corresponding upper crossbars at the front and rear, and the two inclined top frames are located between the two trusses.
[0016] The sloping roof frame includes ridge purlins and eaves purlins arranged in parallel to each other. Several rafters are fixedly connected between the ridge purlins and eaves purlins. The end of the rafters away from the ridge purlin is engaged with the corresponding upper crossbar. The rafters on the front and rear sides correspond one-to-one with the column A. The rafters correspond one-to-one with the adjacent reinforcing columns. The bottom of the rafters is fixedly connected to the corresponding reinforcing column with a limit stop. Several purlins are fixedly connected between the rafters. The rafters have grooves that are adapted to the thickness of the purlins.
[0017] As a further embodiment of this utility model, the truss includes a central column fixedly connected to the top of the corresponding upper crossbar. The top of the central column is connected to the inclined top frame via a V-beam, and the bottom of the central column is connected to the corresponding upper crossbar.
[0018] As a further embodiment of this utility model, the support frame includes columns B arranged parallel to each other in front of the door frame, and a support plate A is fixedly connected to the upper part of the opposite side of the two columns B. The support plate B is fixedly connected to the upper part of the opposite side of the columns B and the columns A.
[0019] As a further embodiment of this utility model, the climbing frame includes a connecting rod fixedly connected between the upright B and the corresponding upper horizontal bar. The inner side of the connecting rod is fixedly connected to the corresponding support plate B. Several equally spaced arc-shaped plates are fixedly connected between the two connecting rods. The bottom of the arc-shaped plates is provided with a slot that matches the connecting rod, and the top of the connecting rod is locked in the slot.
[0020] Compared with existing technologies, the grape trellis greenhouse provided by this utility model has the following beneficial effects: the modular connection between the greenhouse frame and the grape trellis allows for multi-area division; the climbing frame is connected to the main frame and can extend to the main top frame, forming a composite space for vine planting and flower cultivation. Compared with traditional independent settings, it occupies less space, has a high space utilization rate, and meets diverse horticultural needs; the pedestrian passage formed under the climbing frame, in front of the door frame, and between the main frame meets daily access needs, and the "greenhouse internal cultivation area" and "vine climbing area" can also be divided through space division, improving ease of use and forming a horticultural facility that combines practicality, aesthetics, and ecology. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0023] Figure 2 This is a schematic diagram of the greenhouse frame in an embodiment of the present invention;
[0024] Figure 3 This is a schematic diagram of a partial structure of the main frame in an embodiment of this utility model. Figure 1 ;
[0025] Figure 4 This is a partial structural diagram of the main frame in an embodiment of the present invention. Figure 2
[0026] Figure 5 This is an exploded structural diagram of the main top frame in an embodiment of this utility model;
[0027] Figure 6 This is an exploded structural diagram of the grape trellis in an embodiment of this utility model.
[0028] Figure label:
[0029] 100. Greenhouse frame; 110. Main frame; 111. Column A; 112. Upper horizontal bar; 113. Enclosure A; 1131. Reinforcing bar; 1132. Lower horizontal bar; 1133. Reinforcing column; 114. Enclosure B; 115. Baffle; 116. Support plate; 117. Diagonal brace; 118. Decorative panel; 120. Main roof frame; 121. Sloping roof frame; 1211. Ridge purlin; 1212. Eaves purlin; 1213. Rafter; 12131. Groove; 1214. Limiting stop; 1215. Purlin; 122. Truss; 1221. Central column; 1222. V-beam; 130. Door frame; 1161. Support rod;
[0030] 200. Grape trellis; 210. Support frame; 211. Column B; 212. Support plate A; 213. Support plate B; 220. Climbing frame; 221. Connecting rod; 222. Curved plate; 2221. Slot. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0032] In the description of the embodiments of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.
[0033] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.
[0034] See appendix Figures 1-6 As shown, the grape trellis greenhouse of this utility model includes a semi-open greenhouse frame 100 and a grape frame 200 at the front end of the greenhouse frame 100 for grape vines to climb.
[0035] See Figure 2As shown, the greenhouse frame 100 includes a main frame 110, a main top frame 120 on the top of the main frame 110, and a door frame 130 on the front side of the main frame 110.
[0036] See Figure 5 As shown, the grape frame 200 includes two support frames 210 symmetrically arranged about the center line of the door frame 130. A climbing frame 220 that can be connected to the main frame 110 is provided between the two support frames 210. A pedestrian passage is formed below the climbing frame 220, in front of the door frame 130, and between the main frame 110.
[0037] See Figure 2 As shown, the main frame 110 includes four columns A111 arranged in a rectangular array. An upper horizontal bar 112 is fixedly connected to the upper part of two adjacent columns A111. The upper horizontal bar 112 is perpendicular to the columns A111. A barrier A113 is provided between the lower ends of two adjacent columns A111. Two symmetrically arranged barriers B114 are provided between the lower ends of two adjacent columns A111 where the door frame 130 is located. The door frame 130 is formed between the two barriers B114. The support frame 210 and the barriers B114... The four columns A111 are arranged in a rectangular array, forming a rigid frame with the upper crossbars 112. The symmetrical arrangement of the enclosures A113 and B114 enhances the wind resistance of the main frame 110, making it suitable for outdoor horticultural environments. The symmetrical arrangement of the enclosures B114 forms a standard door frame 130, which is arranged opposite to the support frame 210, ensuring the symmetry of the entrance space between the grape trellis 200 and the greenhouse trellis 100 and improving the landscape harmony.
[0038] See Figure 4As shown, fence A113 and fence B114 have the same structure but different positions. Both include a reinforcing rod 1131 and a lower horizontal bar 1132 arranged vertically. The two ends of the reinforcing rod 1131 are fixedly connected to the lower middle part of the corresponding column A111, and the two ends of the lower horizontal bar 1132 are fixedly connected to the bottom of the corresponding column A111. The reinforcing rod 1131, the lower horizontal bar 1132 and the upper horizontal bar 112 above them are arranged parallel to each other. The lower horizontal bar 1132, the reinforcing rod 1131 and the corresponding upper horizontal bar 112 are all fixedly connected to the column A111. The reinforcing columns 1133 are arranged in parallel to each other. At least two reinforcing columns 1133 on fence A113 are evenly spaced, and at least one reinforcing column 1133 on fence B114. The upper and lower support structures of the reinforcing rods 1131 and the lower horizontal bars 1132, together with the reinforcing columns 1133, form a "well"-shaped support, reducing the deformation rate of the fence under load and extending the service life of the structure. The reinforcing columns 1133 are arranged parallel to the uprights A111, which can evenly distribute the load of the main top frame 120 transmitted by the upper horizontal bars 112, avoiding local stress concentration. One side of the door frame 130 is hinged to the front-end reinforcing column 1133 via a stainless steel hinge.
[0039] See Figure 2 As shown, a baffle 115 is fixedly connected between the reinforcing rod 1131 and the lower crossbar 1132. One side of the surface of the upright column A111 and the reinforcing column 1133 is fixedly connected to the corresponding baffle 115. A support plate 116 is provided on the inner side of each of the two adjacent reinforcing rods 1131. At the bottom of the support plate 116, corresponding to the reinforcing column 1133 and the reinforcing rod 1131, a support rod 1161 perpendicular to the support plate 116 is provided. A diagonal brace 1 is fixedly connected to the bottom of the support rod 1161 at an angle. 17. The diagonal brace 117 and the reinforcing column 1133 are set in a one-to-one correspondence. The upper end of the diagonal brace 117 is connected to the corresponding support rod 1161, and the lower end of the diagonal brace 117 is fixedly connected to the corresponding reinforcing column 1133. The baffle 115 between the reinforcing rod 1131 and the lower crossbar 1132 provides isolation and protection between the inside and outside. The inclined support structure of the support plate 116, the support rod 1161 and the diagonal brace 117 can be used as a flower display stand or a rest bench, realizing a multi-functional integration.
[0040] See Figure 2 As shown, a decorative panel 118 is snapped between two adjacent reinforcing columns 1133 and the adjacent upright column A111. The bottom of the decorative panel 118 is fixedly connected to the corresponding reinforcing rod 1131. The decorative panel 118 is snapped between the reinforcing column 1133 and the upright column A111. On the one hand, it enhances the ornamental value of the gardening facility, and on the other hand, the fixing of the decorative panel 118 and the reinforcing rod 1131 enhances the overall strength of the enclosure A113.
[0041] See Figure 4 , 5As shown, the main top frame 120 includes two inclined top frames 121 respectively installed on two opposite upper horizontal bars 112. The two inclined top frames 121 are symmetrically arranged about the center line of the door frame 130. Trusses 122 are respectively installed on the front and rear corresponding upper horizontal bars 112, and the two inclined top frames 121 are located between the two trusses 122.
[0042] The sloping roof frame 121 includes a ridge purlin 1211 and an eaves purlin 1212 arranged in parallel to each other. A plurality of equidistant rafters 1213 are fixedly connected between the ridge purlin 1211 and the eaves purlin 1212. The end of the rafter 1213 away from the ridge purlin 1211 is engaged with the corresponding upper crossbar 112. The rafters 1213 located on the front and rear sides correspond one-to-one with the uprights A111. The remaining rafters 1213 correspond one-to-one with the adjacent reinforcing columns 1133. The bottom of the rafter 1213 is fixedly connected to the corresponding reinforcing column 1133 with a limit stop 1214. A purlin 1215 is fixedly connected between the plurality of rafters 1213. The rafter 1213 is provided with a groove 12131 that matches the thickness of the purlin 1215.
[0043] The truss 122 includes a central column 1221 fixedly connected to the top of the corresponding upper crossbar 112. A V-beam 1222 is fixedly connected to the top of the central column 1221. One side of the V-beam 1222 is fixedly connected to the adjacent rafter 1213. The top of the central column 1221 is engaged with the inclined roof frame 121 via the V-beam 1222, and the bottom of the central column 1221 is engaged with the corresponding upper crossbar 112. The central column 1221 and the V-beam 1222 of the truss 122 transfer the lateral load of the inclined roof frame 121 to the upper crossbar 112, thereby improving the overall stability of the roof. The fixed connection between the V-beam 1222 and the rafter 1213 can serve as a positioning reference during the installation of the inclined roof frame 121, improving construction accuracy.
[0044] The ridge purlin 1211, eaves purlin 1212, and rafters 1213 of the sloping roof frame 121 form a rectangular frame support system, which, together with the V-beams 1222 of the truss 122, enhances the load-bearing capacity of the main roof frame 120. The corresponding arrangement of the rafters 1213 and the reinforcing columns 1133 provides a continuous support path for the grapevines to extend from the climbing frame 220 to the main roof frame 120, forming a fully covered sunshade canopy.
[0045] See Figure 6As shown, the support frame 210 includes two columns B211 located in front of the door frame 130 and perpendicular to each other with the column A111. A support plate A212 is fixedly connected to the upper part of the opposite side of the two columns B211, and a support plate B213 is fixedly connected to the upper part of the opposite side of the columns B211 and A111. The bottom of the support plate B213 is lower than the bottom of the support plate A212, and the top of the support plate B213 is lower than the top of the support plate A212. The columns B211 and A111 are perpendicular to each other, and the support plates A212 and B213 provide vertical support, which increases the overturning moment of the support frame 210 and adapts to heavy loads. The height difference between the support plates A212 and B213 forms a stepped climbing surface, which guides the grapevines to be evenly distributed and avoids local dense growth.
[0046] The climbing frame 220 includes a connecting rod 221 fixedly connected between the upright B211 and the corresponding upper horizontal bar 112. The inner side of the connecting rod 221 is fixedly connected to the corresponding support plate B213. Multiple equally spaced arc-shaped plates 222 are fixedly connected between the two connecting rods 221. The bottom of the arc-shaped plate 222 is provided with a slot 2221 that is adapted to the connecting rod 221. The top of the connecting rod 221 is engaged in the inner cavity of the slot 2221 to ensure structural rigidity.
[0047] It should be noted that all the above components are standardized prefabricated parts, which can be quickly assembled on site through bolts, slots and other connection methods. A single person can complete the construction of the structure, which improves the construction efficiency compared with traditional cast-in-place structures. The 110 main frame design can adapt to various terrains such as square and rectangular, improving the site utilization rate.
[0048] When using the grape trellis greenhouse described above, the flowers are placed inside the main frame 110 and can be placed on the support plate 116 for maintenance operations. The support plate 116 can also be used as a bench.
[0049] During its growth, the grapevines can climb from the ground along the pillar B211 to the connecting rod 221 and the arched plate 222, forming a unique arch structure. They can also climb along the climbing frame 220 to the main roof frame 120, forming a three-dimensional climbing structure of "ground-arch-roof". The vine arch not only meets the needs of daily passage but also forms a landscape axis, achieving an organic integration of "planting space-passage space-viewing space".
[0050] Grapevines climb upwards to the main trellis 120 and then cover the climbing frame downwards to form a hedge. The interior of the greenhouse frame 100 and the support panels 116 support the flowers. This three-dimensional planting increases the number of plants per unit area compared to traditional flat planting.
[0051] After the grapevines cover the rafters 1215, they form a double layer of shade with the sloping roof trellis 121, reducing the summer transmittance. Combined with the transpiration of the grapevines, this increases the internal humidity of the greenhouse structure, creating a suitable microenvironment for the flowers.
[0052] The limit stop 1214 prevents the vines from drooping excessively and affecting the structural safety of the main top frame 120, and provides diffused light or full coverage to the greenhouse frame 100 to form a sunshade, thus improving the user experience.
[0053] In summary, this novel embodiment of the grape trellis greenhouse utilizes a modular design for both the greenhouse frame and the grape trellis, enabling multi-functional use. The climbing frame 220 connects to the main frame 110, allowing the grapevines to extend to the main top frame 120, forming a combined space for grape cultivation and flower nurturing. Compared to traditional independent installations, this reduces the floor space required, significantly improves space utilization, and meets diverse horticultural needs. The pedestrian walkway formed between the climbing frame 220, the door frame 130, and the main frame 110 not only meets daily access needs but also naturally divides the "greenhouse cultivation area" from the "grapevine climbing area" through spatial partitioning, enhancing ease of use.
[0054] The above description illustrates the basic principles of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The above embodiments and descriptions in the specification are only for illustrating the principles of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.
Claims
1. A grape trellis greenhouse, characterized by: The greenhouse includes a semi-open structure (100) with a grape trellis (200) at the front end. The greenhouse frame (100) includes a main frame (110), a main top frame (120) is provided on the top of the main frame (110), and a door frame (130) is provided at the front end of the main frame (110). The grape trellis (200) includes two support frames (210) arranged symmetrically about the center line of the door frame (130), and a climbing frame (220) connected to the main frame (110) is provided between the two support frames (210).
2. The grape trellis greenhouse according to claim 1, characterized in that: The main frame (110) includes columns A (111) arranged in a rectangular array. A horizontal bar (112) is provided between the upper ends of two adjacent columns A (111). A enclosure A (113) is provided between the lower ends of two adjacent columns A (111). Two symmetrical enclosures B (114) are provided between the lower ends of two adjacent columns A (111) where the door frame (130) is located.
3. The grape trellis greenhouse according to claim 2, characterized in that: The enclosure A (113) and enclosure B (114) have the same structure and both include a reinforcing rod (1131) and a lower horizontal bar (1132) arranged vertically. The two ends of the reinforcing rod (1131) are fixedly connected to the lower part of the corresponding column A (111), and the two ends of the lower horizontal bar (1132) are fixedly connected to the bottom of the corresponding column A (111). The lower horizontal bar (1132), the reinforcing rod (1131) and the corresponding upper horizontal bar (112) are all fixedly connected to a reinforcing column (1133) arranged parallel to the column A (111). The door frame (130) is hinged to the front end of the reinforcing column (1133) by a hinge.
4. The grape trellis greenhouse according to claim 3, characterized in that: A baffle (115) is provided between the reinforcing rod (1131) and the lower crossbar (1132); a support plate (116) is provided on the inner side of the adjacent reinforcing rod (1131), and a support rod (1161) perpendicular to the support plate (116) is provided at the bottom of the support plate (116) corresponding to the reinforcing column (1133) and the reinforcing rod (1131). An inclined brace (117) is connected to the bottom of the support rod (1161), and the inclined brace (117) is set in a one-to-one correspondence with the reinforcing column (1133). The upper end of the inclined brace (117) is connected to the corresponding support rod (1161), and the lower end of the inclined brace (117) is connected to the corresponding reinforcing column (1133).
5. The grape trellis greenhouse according to claim 3, characterized in that: A decorative panel (118) is snapped between two adjacent reinforcing columns (1133) and between the reinforcing column (1133) and column A (111), and the bottom of the decorative panel (118) is connected to the corresponding reinforcing rod (1131).
6. The grape trellis greenhouse according to claim 2, characterized in that: The main top frame (120) also includes two inclined top frames (121) respectively installed on the upper crossbar (112). The two inclined top frames (121) are symmetrically arranged about the center line of the door frame (130). The upper crossbar (112) corresponding to the front and rear are provided with trusses (122), and the two inclined top frames (121) are located between the two trusses (122). The inclined roof frame (121) includes a ridge purlin (1211) and an eaves purlin (1212) arranged parallel to each other. A plurality of equidistant rafters (1213) are provided between the ridge purlin (1211) and the eaves purlin (1212). The end of each rafter (1213) away from the ridge purlin (1211) is engaged with the corresponding upper crossbar (112). The rafters (1213) located on the front and rear sides are connected to the column A (112). 1) One-to-one correspondence: the rafters (1213) correspond one-to-one with the adjacent reinforcing columns (1133), and a limiting stop (1214) is provided between the bottom of the rafters (1213) and the corresponding reinforcing column (1133). A purlin (1215) is provided between several rafters (1213), and a groove (12131) is provided on the rafters (1213) that is adapted to the thickness of the purlin (1215).
7. The grape trellis greenhouse according to claim 6, characterized in that: The truss (122) includes a central column (1221), the top of which is connected to the inclined top frame (121) via a V-beam (1222), and the bottom of which is connected to the corresponding upper crossbar (112).
8. The grape trellis greenhouse according to claim 7, characterized in that: The support frame (210) includes two columns B (211) arranged in parallel in front of the door frame (130). The upper part of the opposite side of the two columns B (211) is provided with a support plate A (212). The opposite side of the columns B (211) and the columns A (111) are connected by the support plate B (213).
9. The grape trellis greenhouse according to claim 8, characterized in that: The climbing frame (220) includes a connecting rod (221) connecting the upright B (211) and the corresponding upper horizontal bar (112). The inner side of the connecting rod (221) is connected to the corresponding support plate B (213). Multiple equidistant arc plates (222) are provided between the two connecting rods (221). The bottom of the arc plate (222) is provided with a slot (2221) that is adapted to the connecting rod (221). The top of the connecting rod (221) is locked in the slot (2221).