BIPV photovoltaic panel integrated high-strength fixing structure

Abstract

The present application relates to the technical field of photovoltaic building, and particularly relates to a BIPV photovoltaic panel integrated high-strength fixing structure, which comprises multiple positioning frames uniformly arranged on the upper end of a roof, multiple clamping openings are formed in the two side walls of each positioning frame; multiple linearly and uniformly distributed auxiliary water groove parts are arranged between two adjacent positioning frames, and the auxiliary water groove parts are connected with the corresponding two positioning frames. The positioning frame is matched with multiple positioning parts, so that the function of preliminarily limiting the placed photovoltaic panel can be realized, and the photovoltaic panel will not slide relative to the positioning frame without being pressed and limited, and the positioning part is matched with the positioning frame to simultaneously press and limit multiple photovoltaic panels, so that the step of immediately pressing and fixing each photovoltaic panel after being placed is reduced, and the installation efficiency of multiple photovoltaic panels is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of building photovoltaic technology, and in particular to a high-strength fixing structure for integrated BIPV photovoltaic panels. Background Technology

[0002] BIPV is a technology that integrates solar photovoltaic materials into the building envelope; unlike traditional solar panels, BIPV systems not only generate electricity, but also replace the functions of traditional building materials such as exterior walls, roofs and windows.

[0003] To ensure that the installed photovoltaic panels can be used for a long time and have a certain degree of resistance to environmental interference, such as their own weight, wind pressure, and snow load, the installation frame must have a high load-bearing capacity. The frame mainly consists of a support structure, connectors, and a waterproof structure. Existing BIPV photovoltaic panels are usually installed on the roof. The specific installation steps are as follows: first, install a suitable frame according to the design plan; then, lay appropriate waterproof materials on the building surface to prevent moisture from seeping into the building; then, install the support structure or frame in the predetermined position; and finally, place the photovoltaic panels on the frame and fix them in place.

[0004] However, when splicing existing frames, the waterproof structure is usually connected to the supporting structure by welding or connectors, resulting in many connection points, which makes the installation process cumbersome, and the strength of the frame structure cannot be increased after splicing. When installing photovoltaic panels, they are usually pressed down with fasteners after each panel is laid, and multiple photovoltaic panels cannot be pressed down and limited at the same time, resulting in low installation efficiency. There is a lack of linkage between the fasteners, and the stress cannot be evenly distributed. In the long term, local stress concentration is likely to occur, increasing the risk of damage to the fasteners.

[0005] Therefore, there is an urgent need to provide a fixing structure that can improve the installation efficiency and strength of photovoltaic panels. Summary of the Invention

[0006] Therefore, it is necessary to provide a high-strength fixing structure for integrated BIPV photovoltaic panels, which aims to solve the problems arising during the installation of existing BIPV photovoltaic panels.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a high-strength fixing structure for integrated BIPV photovoltaic panels, comprising: multiple positioning frames evenly arranged on the upper part of the roof, with multiple snap-fit ​​openings on both sides of the positioning frames.

[0008] Multiple linearly and evenly distributed secondary water tanks are set between two adjacent positioning frames. The secondary water tanks are connected to the corresponding two positioning frames. The multiple positioning frames and multiple secondary water tanks are spliced ​​together to form the installation positioning base of the photovoltaic panel.

[0009] A plurality of positioning parts for positioning the photovoltaic panels are connected to the middle of the upper end of the positioning frame, and the positioning parts include positioning plates in the shape of a cross and installed on the upper end of the positioning frame, and positioning holes are formed in the middle of the positioning plates.

[0010] A sealing part is arranged above the auxiliary water channel part, and the sealing part is used for sealing the gap between two adjacent photovoltaic panels.

[0011] The limiting part for simultaneously pressing a plurality of photovoltaic panels is further connected to the positioning frame, and the limiting part includes a limiting frame arranged on the upper end of the positioning frame, the limiting frame has a U-shaped structure, a plurality of uniformly distributed insertion rods are installed on the lower end of the middle section of the limiting frame, the insertion rods are inserted into the corresponding positioning holes, and the front and rear ends of the limiting frame are detachably fixedly connected with the positioning frame.

[0012] The limiting part simultaneously presses and limits a plurality of photovoltaic panels, simultaneously presses a plurality of sealing parts, and limits a plurality of auxiliary water channel parts through the plurality of photovoltaic panels.

[0013] Preferably, two water flow channels are symmetrically arranged on the upper end of the positioning frame along the length direction thereof, the water flow channels are communicated with the corresponding plurality of clamping openings, and threaded holes are formed on the front and rear sides of the upper end of the positioning frame.

[0014] Preferably, a rectangular groove is formed on each of the two side walls of the clamping opening, and the spacing between the adjacent two clamping openings on the positioning frame is matched with the width of the photovoltaic panel.

[0015] Preferably, the auxiliary water channel part includes a water collecting frame arranged between the adjacent two positioning frames, the water collecting frame has a U-shaped structure with an opening facing upward and is located below the gap between the adjacent two photovoltaic panels, clamping plates are installed on the two ends of the vertical side walls of the water collecting frame, and the length of the water collecting frame is matched with the length of the photovoltaic panel.

[0016] Preferably, the positioning part further includes a connecting column symmetrically installed on the upper end of the positioning plate.

[0017] Preferably, the sealing part has a strip-shaped structure with a T-shaped cross section, the horizontal section of the sealing part is attached to the adjacent two photovoltaic panels, and connecting holes are formed at the two ends of the sealing part and are inserted into the corresponding connecting columns.

[0018] Preferably, the limiting part further includes lock screws movably connected to the front and rear ends of the limiting frame, and the lock screws are threadedly connected with the corresponding threaded holes.

[0019] Preferably, the limiting part further includes two groups of pressing groups formed on the lower end of the middle section of the limiting frame, the two groups of pressing groups are located on the two sides of the length direction of the limiting frame, each group of pressing groups is composed of a plurality of uniformly distributed pressing openings, and clamping rods are installed in the pressing openings.

[0020] In summary, the present invention has the following beneficial technical effects: 1. The positioning frame used in the present invention, in cooperation with multiple positioning parts, can achieve the function of initially limiting the placement of photovoltaic panels. Without pressing and limiting them, they will not slide relative to the positioning frame. Furthermore, the limiting parts and the positioning frame can simultaneously press and limit multiple photovoltaic panels, reducing the need for immediate pressing and fixing of each photovoltaic panel after placement, and effectively improving the efficiency of installing multiple photovoltaic panels.

[0021] 2. The multiple positioning parts used in this invention can transmit force through the positioning frame and limiting parts, so that the multiple positioning parts are subjected to force evenly. This avoids the phenomenon of local stress concentration after the positioning parts support the photovoltaic panels for a long time, reduces the risk of the positioning parts being damaged by force, and further improves the overall strength of the multiple photovoltaic panels after installation.

[0022] 3. The positioning frame and the auxiliary water tank are vertically connected by a plug-in joint, which not only improves the overall connection strength between multiple positioning frames, but also reduces the bolt connection or welding of multiple connection points, effectively improving the connection efficiency between the positioning frame and the auxiliary water tank. On this basis, the sealing element connected between two adjacent positioning frames can further increase the overall connection strength between multiple positioning frames and improve its load resistance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown.

[0025] Figure 2 A top view of the invention is shown.

[0026] Figure 3 It shows Figure 2 Sectional view of AA.

[0027] Figure 4 It shows Figure 2 A cross-sectional view of BB.

[0028] Figure 5 It shows Figure 4 A magnified view of region C in the middle.

[0029] Figure 6 A schematic diagram showing the connection relationship between the positioning frame, the auxiliary water tank, and the positioning part of the present invention is shown.

[0030] Figure 7 An enlarged view of the D region is shown. Figure 6 An enlarged view of the D region is shown.

[0031] Figure 8 A schematic view of the splicing of the photovoltaic panel, the positioning frame, the auxiliary water tank part and the positioning part is shown.

[0032] Figure 9 A schematic view of the structure of the limiting part of the application is shown.

[0033] Figure 10 A schematic view of the installation of the photovoltaic panel in the application is shown.

[0034] Wherein, the above drawings include the following reference signs: 1, positioning frame; 10, clamping opening; 11, water flow channel; 12, threaded hole; 13, rectangular groove; 2, auxiliary water tank part; 20, water collecting frame; 21, clamping plate; 3, positioning part; 30, positioning plate; 31, positioning hole; 32, connecting column; 4, sealing element; 40, connecting hole; 5, limiting part; 50, limiting frame; 51, plug-in rod; 52, locking screw; 53, pressing opening; 54, clamping rod. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below in combination with the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the application. However, the application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the concept of the application, so the application is not limited by the specific embodiments disclosed below.

[0036] Referring to Figure 1 and Figure 2 A BIPV photovoltaic panel integrated high-strength fixing structure, comprising a plurality of positioning frames 1 uniformly arranged on the upper end of the roof.

[0037] In specific work, the plurality of positioning frames 1 are moved to the upper end of the roof where they are to be installed, and then one positioning frame 1 is selected to be laid on the starting end of the roof installation area. The positioning frame 1 is fixedly connected to the roof through a plurality of existing fixing elements, which can be a few-shaped mounting bracket, fixing bolt or other fixing structure.

[0038] Referring to Figure 6 A plurality of clamping openings 10 are formed on the two side walls of the positioning frame 1, rectangular grooves 13 are formed on the two side walls of the clamping opening 10, and the spacing between the two adjacent clamping openings 10 on the positioning frame 1 matches the width of the photovoltaic panel.

[0039] Referring toFigure 4 and Figure 6 , multiple linearly and uniformly distributed auxiliary water channel parts 2 are arranged between the two adjacent positioning frames 1, and the auxiliary water channel parts 2 are connected with the corresponding two positioning frames 1.

[0040] Referring to Figure 2 , Figure 4 , Figure 6 and Figure 7 , the auxiliary water channel part 2 comprises a water collecting frame 20 arranged between the two adjacent positioning frames 1, the water collecting frame 20 is in a U-shaped structure with an opening facing upward and is located below the gap between the two adjacent photovoltaic panels, and the two ends of the two vertical side walls of the water collecting frame 20 are both provided with a clamping plate 21 by welding, and the length of the water collecting frame 20 matches the length of the photovoltaic panel.

[0041] In specific work, after the positioning frame 1 at the starting end is fixed, one end of the multiple water collecting frames 20 is sequentially placed in the multiple clamping openings 10 on the side wall of the positioning frame 1, and the end of the water collecting frame 20 is inserted into the clamping opening 10, and at the same time, the two clamping plates 21 at the end of the water collecting frame 20 are inserted into the two rectangular grooves 13 on both sides of the clamping opening 10 (as shown in Figure 7 , since the spacing between the multiple clamping openings 10 on the side wall of the positioning frame 1 matches the width of the photovoltaic panel, the spacing between the multiple water collecting frames 20 connected to the positioning frame 1 matches the width of the photovoltaic panel, that is, each water collecting frame 20 is located at the lower end of the side edge of the photovoltaic panel, and the water collecting frame 20 collects the rainwater falling between the two adjacent photovoltaic panels. Subsequently, the next positioning frame 1 is selected and placed at the other end of the multiple water collecting frames 20, and the other end of the multiple water collecting frames 20 is fixedly connected with the multiple clamping openings 10 on the side wall of the next positioning frame 1. The two ends of the water collecting frame 20 can be quickly connected with the two positioning frames 1, and through the cooperation of the clamping plate 21 and the rectangular groove 13, the strength of the connection between the water collecting frame 20 and the two positioning frames 1 is effectively improved. At the same time, the length of the water collecting frame 20 matches the length of the photovoltaic panel to be installed, and there is no need to measure the installation position again during the installation of the remaining positioning frames 1, which effectively reduces the difficulty of the installation of the positioning frame 1. Then, the steps of the installation of the multiple water collecting frames 20 and the positioning frame 1 are repeated until the multiple positioning frames 1 are evenly laid on the installation area of the roof, and the multiple positioning frames 1 and the multiple auxiliary water channel parts 2 are connected to form the installation and positioning base of the photovoltaic panel. Multiple water collecting frames 20 are connected between every two adjacent positioning frames 1, effectively increasing the overall strength between the multiple positioning frames 1.

[0042] Referring to Figure 2 , Figure 3 and Figure 6The positioning frame 1 is provided with a plurality of positioning parts 3 for positioning the photovoltaic panel on the upper middle part of the positioning frame 1, wherein the positioning part 3 comprises a positioning plate 30 in the shape of a cross and welded on the upper end of the positioning frame 1, and the positioning plate 30 is provided with a positioning hole 31 in the middle part.

[0043] In the specific work, after the plurality of positioning frames 1 are fixed on the roof, the plurality of photovoltaic panels are placed between the adjacent two positioning frames 1 in sequence, and each photovoltaic panel is placed on the upper end of the two positioning frames 1 and located between the four positioning plates 30 in the rectangular distribution, and the four positioning plates 30 in the shape of a cross block the four corners of the photovoltaic panel respectively to realize the preliminary limiting of the photovoltaic panel installation, and the placed photovoltaic panel does not need to be immediately fixed and connected on the two positioning frames 1, the plurality of photovoltaic panels are placed without affecting each other, and the simultaneously placed photovoltaic panels can be tightly limited on the two water collecting frames 20 at the lower end to further increase the connecting strength between the water collecting frame 20 and the positioning frame 1, and the steps of placing the photovoltaic panel are repeated until the plurality of photovoltaic panels are completely placed (as shown in Figure 8 ).

[0044] Referring to Figure 2 , Figure 4 and Figure 5 , the upper part of the auxiliary water tank part 2 is provided with a sealing piece 4 for sealing the gap between the adjacent two photovoltaic panels.

[0045] Referring to Figure 2 , Figure 4 , Figure 5 and Figure 6 , the positioning part 3 further comprises a connecting column 32 symmetrically installed on the upper end of the positioning plate 30; the sealing piece 4 is in the shape of a strip structure with a T-shaped cross section, the lower end of the horizontal section of the sealing piece 4 is attached to the adjacent two photovoltaic panels, and both ends of the sealing piece 4 are provided with a connecting hole 40 for plug-in cooperation and connection with the corresponding connecting column 32.

[0046] In the specific work, the sealing piece 4 is in the existing T-shaped strip structure, which can be a rod or a pipe, and is not limited to this, after the plurality of photovoltaic panels are completely placed, the plurality of sealing pieces 4 are placed in the gap between the adjacent two photovoltaic panels in sequence and seal the gap, the lower end of the horizontal section of the T-shaped sealing piece 4 is located on the upper end of the two photovoltaic panels respectively, and the two connecting holes 40 on the sealing piece 4 are plugged in with the two connecting columns 32 on the upper end of the two positioning plates 30 to realize the preliminary positioning of the sealing piece 4, and the lower end of the horizontal section of the sealing piece 4 can be paved with a rubber strip to increase the sealing strength, and the steps of installing the sealing piece 4 are repeated until the plurality of sealing pieces 4 are completely installed.

[0047] Referring to Figure 2 , Figure 3 , Figure 5 and Figure 9The positioning frame 1 is further connected with a limiting part 5 for simultaneously pressing multiple photovoltaic panels, the limiting part 5 comprises a limiting frame 50 arranged at the upper end of the positioning frame 1, the limiting frame 50 has a U-shaped structure, a plurality of evenly distributed insertion rods 51 are arranged at the lower end of the middle section of the limiting frame 50, the insertion rods 51 are inserted into the corresponding positioning holes 31, and the front end and the rear end of the limiting frame 50 are detachably fixedly connected with the positioning frame 1.

[0048] Referring to Figure 6 and Figure 9 , the front side and the rear side of the upper end of the positioning frame 1 are both provided with threaded holes 12; the limiting part 5 further comprises locking screws 52 movably connected at the front end and the rear end of the limiting frame 50, respectively, and the locking screws 52 are threadedly connected with the corresponding threaded holes 12.

[0049] In specific work, after the multiple sealing members 4 are all installed, the multiple limiting frames 50 are sequentially placed on the multiple positioning frames 1, the limiting frame 50 drives the multiple insertion rods 51 to be inserted into the corresponding positioning holes 31 on the positioning plate 30 when the limiting frame 50 is placed, then the two locking screws 52 on the limiting frame 50 are threadedly connected with the two threaded holes 12 on the positioning frame 1, thereby realizing the fixed connection between the limiting frame 50 and the positioning frame 1, and meanwhile, the middle section of the limiting frame 50 is tightly attached to the multiple photovoltaic panels at the upper end of the positioning frame 1 and simultaneously presses the multiple photovoltaic panels, the multiple positioning plates 30, the limiting frame 50 and the positioning frame 1 jointly realize the function of simultaneously fixing and limiting the multiple photovoltaic panels, thereby reducing the operation steps and installation time of sequentially fixing the multiple photovoltaic panels on the positioning frame 1, effectively improving the installation efficiency of the multiple photovoltaic panels, and the multiple insertion rods 51 of the limiting frame 50 are inserted into the multiple positioning plates 30 and the multiple positioning plates 30 are installed on the same positioning frame 1, so that the multiple positioning plates 30 are in force correlation, that is, on the inclined roof, the photovoltaic panel is pressed against the positioning plate 30 at the lower end of the inclined direction through its own gravity after installation, the pressed positioning plate 30 can share the force on the multiple positioning plates 30 and the positioning frame 1 through the insertion rods 51 on the limiting frame 50 and the positioning frame 1, that is, each photovoltaic panel is supported by multiple positioning plates 30, thereby avoiding the risk of damage of the positioning plate 30 due to local stress concentration for a long time, ensuring the stability of the overall use of the multiple positioning plates 30, and avoiding the relative movement between the photovoltaic panel and the positioning frame 1 after long-term use, thereby further improving the overall fixing strength of the multiple photovoltaic panels.

[0050] Referring to Figure 2 , Figure 5 and Figure 9The limiting part 5 further comprises two groups of pressing groups arranged in the lower end of the middle section of the limiting frame 50, and the two groups of pressing groups are respectively arranged on the two sides of the length direction of the limiting frame, each group of pressing groups is composed of a plurality of uniformly distributed pressing openings 53, and a clamping rod 54 is arranged in the pressing opening 53.

[0051] In the specific work, when the limiting frame 50 is pressed and limited to the photovoltaic panel, the plurality of pressing openings 53 on the limiting frame 50 is respectively moved to the end of the plurality of sealing members 4, the clamping rod 54 is inserted and matched with the connecting hole 40 on the sealing member 4, and the function of pressing and limiting the sealing member 4 is realized (as shown in Figure 10 The sealing member 4 further increases the connection strength between the adjacent two limiting frames 50 and the adjacent two positioning frames 1.

[0052] Referring to Figure 6 The positioning frame 1 is provided with two water flow channels 11 on the upper end along the length direction, and the water flow channel 11 is communicated with the corresponding plurality of clamping openings 10.

[0053] In the specific work, the water flow channel 11 is used for draining rainwater, the water collecting frame 20 is used for collecting the rainwater falling between the photovoltaic panels, and the rainwater is discharged into the water flow channel 11 through the clamping opening 10.

[0054] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements 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.

[0055] In addition, the terms "first", "second", "one", "two" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second", "one", "two" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0056] In the present application, unless otherwise explicitly specified and limited, the terms "arranged", "mounted", "connected", "linked", "fixed" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, can be the communication inside two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The embodiments of the present application are preferred embodiments of the present application, not to limit the protection scope of the present application, therefore; any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A BIPV photovoltaic panel integrated high-strength fixing structure, characterized in that: Including a plurality of positioning frames uniformly arranged on the upper end of the roof, a plurality of clamping openings are arranged on the two side walls of the positioning frame; A plurality of linearly and uniformly distributed auxiliary water groove parts are arranged between the two adjacent positioning frames, the auxiliary water groove part is connected with the corresponding two positioning frames, and the plurality of positioning frames and the plurality of auxiliary water groove parts are spliced to form the installation and positioning base of the photovoltaic panel. A plurality of positioning parts for positioning the photovoltaic panel are connected to the middle of the upper end of the positioning frame, the positioning part includes a positioning plate in the shape of a cross and installed on the upper end of the positioning frame, and a positioning hole is arranged in the middle of the positioning plate. A sealing element is arranged above the auxiliary water groove part, and the sealing element is used to seal the gap between the two adjacent photovoltaic panels. The limiting part includes a limiting frame arranged on the upper end of the positioning frame, the limiting frame is in the shape of a few characters, a plurality of uniformly distributed insertion rods are arranged on the lower end of the middle segment of the limiting frame, the insertion rod is inserted into the corresponding positioning hole, and the front and rear ends of the limiting frame are detachably connected with the positioning frame. The limiting part compresses and limits the plurality of photovoltaic panels, and simultaneously compresses and limits the plurality of sealing elements, and the plurality of photovoltaic panels compress and limit the plurality of auxiliary water groove parts.

2. The BIPV photovoltaic panel integrated high-strength fixing structure according to claim 1, characterized in that: Two water flow channels are symmetrically arranged on the upper end of the positioning frame along the length direction, the water flow channel is communicated with the corresponding plurality of clamping openings, and a threaded hole is arranged on the front and rear sides of the upper end of the positioning frame.

3. The BIPV photovoltaic panel integrated high-strength fixing structure according to claim 1, characterized in that: A rectangular groove is arranged on the two side walls of the clamping opening, and the distance between the two adjacent clamping openings on the positioning frame matches the width of the photovoltaic panel.

4. The BIPV photovoltaic panel integrated high-strength fixing structure according to claim 1, characterized in that: The auxiliary water groove part includes a water collecting frame arranged between the two adjacent positioning frames, the water collecting frame is in the shape of an open upward U-shaped structure and is located below the gap between the two adjacent photovoltaic panels, the two vertical side walls of the water collecting frame are provided with clamping plates at both ends, and the length of the water collecting frame matches the length of the photovoltaic panel.

5. The BIPV photovoltaic panel integrated high-strength fixing structure according to claim 1, characterized in that: The positioning part further includes a connecting column symmetrically arranged on the upper end of the positioning plate.

6. The BIPV photovoltaic panel integrated high-strength fixing structure according to claim 5, characterized in that: The sealing element is in the shape of a T-shaped strip structure, the lower end of the horizontal segment of the sealing element is attached to the two adjacent photovoltaic panels, and the both ends of the sealing element are provided with insertion and connection holes connected with the corresponding connecting columns.

7. The BIPV photovoltaic panel integrated high-strength fixing structure according to claim 2, characterized in that: The limiting part further includes a locking screw movably connected to the front and rear ends of the limiting frame, and the locking screw is threadedly connected with the corresponding threaded hole.

8. The BIPV photovoltaic panel integrated high-strength fixing structure according to claim 7, characterized in that: The limiting part further includes two groups of pressing groups arranged on the lower end of the middle segment of the limiting frame, the two groups of pressing groups are located on the two sides of the length direction of the limiting frame, each group of pressing groups is composed of a plurality of uniformly distributed pressing openings, and a clamping rod is arranged in the pressing opening.

Images