Compact trunking with moisture-proof performance
By using the sliding connection of the U-shaped shell and U-shaped cover plate and the design of the triangular reinforcing ribs, combined with the rubber sleeve seal, the problem of traditional cable trays being susceptible to moisture in humid environments is solved, achieving stable installation and moisture-proof effect for compact cable trays.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG YUANXING TECH IND CO LTD
- Filing Date
- 2025-08-12
- Publication Date
- 2026-07-14
Smart Images

Figure CN224502821U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of compact cable tray technology, and in particular to a compact cable tray with moisture-proof performance. Background Technology
[0002] In modern electrical wiring projects, cable trays are crucial components for protecting and organizing cables, and their performance is paramount. Especially in environments with limited space and high humidity, such as basements and damp industrial plants, cable trays need both a compact structure to save space and excellent moisture resistance to ensure stable cable operation and lifespan. However, traditional cable trays often fail to meet both critical requirements simultaneously; they are either bulky and occupy too much space, or their moisture resistance is insufficient, making cables susceptible to moisture damage in humid environments, thus affecting the reliability of the entire electrical system. Therefore, developing a new type of compact cable tray with moisture-resistant properties has significant practical significance and application value.
[0003] Traditional compact cable trays with moisture-proof properties have not solved the problems of facilitating installation, wire arrangement and separation, moisture protection, and meeting the needs of safe wiring in different environments, thus failing to improve the stability and safety of line installation and use. Therefore, we propose a compact cable tray with moisture-proof properties. Utility Model Content
[0004] The purpose of this utility model is to address the shortcomings of existing technologies that lack a series of functions from easy installation, wire arrangement and separation to moisture-proofing and protection, meet the needs of safe wiring in different environments, and improve the stability and safety of line installation and use. Therefore, a compact cable tray with moisture-proof performance is proposed.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A compact cable tray with moisture-proof performance includes an experimental board and a fixing assembly. The fixing assembly is characterized in that: the top of the experimental board is fixedly connected to the fixing assembly, which includes a first U-shaped shell; a second U-shaped shell is fixedly connected to one side of the first U-shaped shell; T-shaped grooves are formed on the left and right sides of the upper end of the inner walls of both the first and second U-shaped shells; two U-shaped cover plates are slidably connected inside both the first and second U-shaped shells; two T-shaped buckles are fixedly connected to the left and right sides of the lower end of the two U-shaped cover plates; two U-shaped rubber sleeves are fixedly connected to the left and right sides of ... right and right sides of the left and right sides of the left and right
[0007] As a further embodiment of this utility model: triangular reinforcing ribs are fixedly connected to the lower ends of the inner walls of the first U-shaped shell and the second U-shaped shell, and a frosted inner protective shell is fixedly connected to the upper surface of the three triangular reinforcing ribs. The lower left and right sides of the inner protective shell are arc-shaped.
[0008] Triangular reinforcing ribs are fixed to the lower inner walls of the first and second U-shaped shells. This connection method utilizes the stability of the triangular structure to enhance the load-bearing capacity of the U-shaped shells, preventing deformation under external forces and protecting the internal wiring. The upper surface of the triangular reinforcing ribs connects to a frosted inner protective shell. The frosted finish increases surface friction, better securing the components within the inner protective shell and preventing slippage, thus maintaining the stability of the cable tray's internal structure. The lower left and right sides of the inner protective shell are designed with rounded edges. This shape allows water to drain smoothly, reducing water accumulation at the lower end of the inner protective shell and enhancing the cable tray's moisture-proof performance.
[0009] As a further embodiment of this utility model: an installation component is fixedly connected inside the inner protective shell. The installation component includes a first square frame, a second square frame is fixedly connected to one side of the first square frame, and four support columns are fixedly connected to the middle of the first square frame and the second square frame.
[0010] The internal protective shell houses the mounting components, which, through this connection, provide a specialized framework structure for the installation and organization of wires, facilitating their orderly arrangement and management. The first and second square frames within the mounting assembly are connected on one side, creating a continuous space that allows wires to pass smoothly and accommodates different wiring routes. Four support columns connect the middle of the first and second square frames, enhancing the connection strength and stability between the two frames. This allows the mounting assembly to withstand certain external forces and protect the internal wires.
[0011] As a further improvement of this utility model: the four support columns are perpendicular and parallel to each other in pairs, and two mounting plates are fixedly connected to the top and bottom of the four support columns.
[0012] The four support columns are arranged perpendicularly and parallel to each other in pairs. This layout creates a regular and stable three-dimensional frame, providing a stable and reliable support structure for the mounting plates. Two mounting plates are fixed to the top and bottom of the four support columns. This connection allows the mounting plates to be precisely positioned in specific locations, providing the necessary support for subsequent installation of limit baffles and separation of electrical wires.
[0013] As a further improvement of this utility model: the upper surfaces of the two mounting plates are provided with a number of slots, and a number of limiting baffles are inserted inside the two slots.
[0014] Several slots are provided on the upper surface of the two mounting plates. These slots provide suitable mounting locations for the limit baffles, allowing for flexible adjustment of the number and position of the limit baffles based on the actual number and distribution of wires. Several limit baffles are inserted into the slots, separating the wires and ensuring they are neatly arranged, preventing tangling and facilitating maintenance and repair.
[0015] As a further embodiment of this utility model: threaded holes are provided on the surfaces of both connecting ears and the experimental plate; the first U-shaped shell, the second U-shaped shell, and the U-shaped cover plate are fixedly connected by a U-shaped positioning plate; and the U-shaped positioning plate is fixedly connected to the surface of the experimental plate by fixing bolts.
[0016] Two connecting lugs and threaded holes are provided on the surface of the experimental plate. These threads provide a base for screwing in the fixing bolts, facilitating a tight connection between the U-shaped positioning plate and the entire cable tray structure and the experimental plate. The first U-shaped shell, the second U-shaped shell, and the U-shaped cover plate are fixedly connected by the U-shaped positioning plate. This connection method integrates the key components of the cable tray into a unified whole, ensuring the integrity and stability of the cable tray structure and preventing it from falling apart during use. The U-shaped positioning plate is fixed to the surface of the experimental plate by fixing bolts. The tightening action of the fixing bolts ensures that the cable tray is firmly installed on the experimental plate, guaranteeing that the cable tray maintains a stable position and does not shift under various usage scenarios.
[0017] Compared with the prior art, this utility model provides a compact cable tray with moisture-proof performance, which has the following beneficial effects:
[0018] 1. In this utility model, the first U-shaped shell and the second U-shaped shell are fixedly connected to each other on one side. This connection method forms a continuous basic structure with accommodating space, providing a carrier for subsequent wiring and the installation of other components. Simultaneously, the T-shaped grooves on the upper left and right sides of the inner walls of the first and second U-shaped shells provide a guiding and positioning structure for the installation of the U-shaped cover. Through the cooperation of the T-shaped grooves and the T-shaped buckles on the lower left and right sides of the U-shaped cover, the U-shaped cover is initially positioned in the vertical direction, preventing it from falling off and ensuring the sealing of the cable tray.
[0019] The U-shaped cover is slidably connected to the T-shaped grooves on the inner walls of the first and second U-shaped shells via T-shaped buckles on both sides of its lower end. This buckle-groove cooperation allows the U-shaped cover to slide smoothly along the T-groove, facilitating installation and removal and enabling access to the internal wiring. The U-shaped rubber sleeves fixedly connected to the left and right sides of the U-shaped cover contact the U-shaped positioning plate after installation. The elasticity and sealing properties of the rubber sleeves enhance the moisture-proof performance of the wire trough, preventing moisture from entering and protecting the wiring.
[0020] The U-shaped positioning plate is fixedly connected to the U-shaped cover in the middle. This connection method forms an integral structure between the U-shaped cover and the U-shaped positioning plate, providing a unified positioning and connection foundation for the entire cable tray. The connecting ears on the left and right sides of the lower end of the U-shaped positioning plate and the threaded holes on the surface of the experimental plate provide installation positions for fixing bolts. By tightening the fixing bolts through the connecting ears and the threaded holes on the experimental plate, the U-shaped positioning plate is firmly fixed to the surface of the experimental plate, thereby achieving the goal of stably installing the first U-shaped shell, the second U-shaped shell, and the U-shaped cover as a whole on the experimental plate.
[0021] In summary, the device achieves its purpose of easy connection and installation through the interlocking connection between the first U-shaped shell, the second U-shaped shell, the U-shaped cover, and the U-shaped positioning plate. This allows the wire trough to be installed quickly and stably on the experimental board, providing a reliable foundation for the subsequent wiring arrangement and use.
[0022] 2. In this utility model, the first U-shaped shell and the second U-shaped shell are fixedly connected to each other to form the main frame of the cable tray. This connection method provides a stable foundation structure for the entire cable tray, enabling it to support the internal components and wires. Triangular reinforcing ribs are fixedly connected to the lower end of the inner wall. The triangular stabilizing structure of the reinforcing ribs enhances the structural strength of the U-shaped shell, making the cable tray less prone to deformation under external forces, thus better protecting the internal wiring and providing structural protection against moisture.
[0023] The U-shaped cover plate is slidably connected to the upper T-shaped groove on the inner wall of the first and second U-shaped shells via a T-shaped buckle at the lower end. This connection design allows the U-shaped cover plate to be easily installed on the U-shaped shells, facilitating the opening and closing of the cable tray and enabling operation of the internal wiring. U-shaped rubber gaskets fixedly connected to both sides of the U-shaped cover plate make tight contact with the U-shaped positioning plate after installation. The elasticity and sealing properties of the U-shaped rubber gaskets fill gaps, preventing moisture from entering the interior from the edges of the cable tray and enhancing moisture resistance.
[0024] The U-shaped positioning plate is fixedly connected to the U-shaped cover plate in the middle, combining the U-shaped cover plate with itself into a single structure. This connection method provides more stable support and positioning for the U-shaped cover plate, ensuring its stability during use and maintaining the cable tray's airtightness and moisture-proof performance. Simultaneously, the U-shaped positioning plate is fixedly connected to the surface of the experimental plate via connecting ears and fixing bolts, firmly installing the entire cable tray structure onto the experimental plate. This ensures the cable tray remains stable under various environmental conditions, preventing damage to the moisture-proof structure due to shaking or displacement.
[0025] The mounting components are fixed inside the inner protective shell, which is connected to the first and second U-shaped shells via triangular reinforcing ribs. The mounting components include interconnected first and second square frames, and four support columns connecting them. This structural design provides an orderly space for wire arrangement, facilitating wire organization and preventing tangled wiring from affecting moisture resistance. Two mounting plates connected to the top and bottom of the support columns have slots on their upper surfaces for inserting limiting baffles. This installation method separates the wires, ensuring neat arrangement and reducing the risk of damaged cable tray seals due to wire compression or tangling, thereby enhancing moisture resistance.
[0026] In summary, this compact cable tray with moisture-proof properties achieves a series of functions, from installation and wire arrangement and separation to moisture-proofing and protection, through the coordinated work of various components according to a specific process. It meets the needs of safe wiring in different environments and improves the stability and safety of line installation and use.
[0027] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a compact cable trough with moisture-proof performance proposed in this utility model.
[0029] Figure 2 This is a three-dimensional structural diagram of a compact cable tray with moisture-proof properties proposed in this utility model.
[0030] Figure 3 This is a three-dimensional structural diagram of a compact cable tray with moisture-proof properties proposed in this utility model.
[0031] Figure 4 This is a three-dimensional structural diagram of the U-shaped positioning plate proposed in this utility model;
[0032] Figure 5 This is a schematic diagram of the first U-shaped shell structure proposed in this utility model.
[0033] In the diagram: 1. Experimental board; 2. Fixing assembly; 201. First U-shaped shell; 202. Second U-shaped shell; 203. T-slot; 204. U-shaped cover plate; 205. T-shaped buckle; 206. U-shaped rubber sleeve; 207. U-shaped positioning plate; 208. Connecting ear; 209. U-shaped groove; 210. Triangular reinforcing rib; 211. Inner protective shell; 3. Mounting assembly; 301. First square frame; 302. Second square frame; 303. Support column; 304. Mounting plate; 305. Slot; 306. Limiting baffle; 4. Threaded hole; 5. Fixing bolt. Detailed Implementation
[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0035] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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 this utility model.
[0036] Example: Reference Figures 1 to 5 A compact cable tray with moisture-proof performance includes an experimental plate 1 and a fixing component 2. The fixing component 2 is fixedly connected to the top of the experimental plate 1. The fixing component 2 includes a first U-shaped shell 201, a second U-shaped shell 202 fixedly connected to one side of the first U-shaped shell 201, T-shaped grooves 203 on the left and right sides of the upper end of the inner wall of the first U-shaped shell 201 and the second U-shaped shell 202, two U-shaped cover plates 204 slidably connected inside the first U-shaped shell 201 and the second U-shaped shell 202, two T-shaped buckles 205 fixedly connected to the left and right sides of the lower end of the two U-shaped cover plates 204, two U-shaped rubber sleeves 206 fixedly connected to the left and right sides of the left and right sides of the left and right sides of the left and right sides of the left and right sides of the left and right sides of the left and right sides of the left and right sides of the right ...
[0037] The lower ends of the inner walls of the first U-shaped shell 201 and the second U-shaped shell 202 are fixedly connected with triangular reinforcing ribs 210. The upper surfaces of the three triangular reinforcing ribs 210 are fixedly connected with an inner protective shell 211 that has been frosted. The lower left and right sides of the inner protective shell 211 are arc-shaped.
[0038] An installation component 3 is fixedly connected inside the inner protective shell 211. The installation component 3 includes a first square frame 301, a second square frame 302 is fixedly connected to one side of the first square frame 301, and four support columns 303 are fixedly connected to the middle of the first square frame 301 and the second square frame 302.
[0039] The four support columns 303 are perpendicular and parallel to each other in pairs, and the top and bottom ends of the four support columns 303 are fixedly connected to two mounting plates 304.
[0040] The upper surfaces of both mounting plates 304 are provided with several slots 305, and the interior of each slot 305 is provided with several limiting baffles 306.
[0041] Both connecting ears 208 and the surface of the experimental plate 1 are provided with threaded holes 4. The first U-shaped shell 201, the second U-shaped shell 202 and the U-shaped cover plate 204 are fixedly connected by a U-shaped positioning plate 207. The U-shaped positioning plate 207 is fixedly connected to the surface of the experimental plate 1 by fixing bolts 5.
[0042] In this embodiment, the first U-shaped shell 201 and the second U-shaped shell 202 are important parts of the fixing component 2. They are fixedly connected to each other, and this connection method forms the main frame of the cable tray, providing a basic support structure for the entire cable tray and allowing subsequent components to be installed. Meanwhile, the T-shaped grooves 203 on the upper left and right sides of their inner walls provide a key positioning structure for the installation of the U-shaped cover plate 204. Through cooperation with the T-shaped buckles 205 at the lower end of the U-shaped cover plate 204, the U-shaped cover plate 204 is positioned and fixed in the vertical direction, ensuring the stable installation of the U-shaped cover plate 204 and maintaining the sealing of the cable tray. The triangular reinforcing ribs 210 fixedly connected to the lower end of the inner walls utilize the stability of the triangular structure to enhance the overall strength of the U-shaped shells, making them less prone to deformation under external forces, protecting the internal structure and wiring, and laying the foundation for the stability and moisture-proof performance of the entire cable tray.
[0043] The U-shaped cover 204 is slidably connected to the T-shaped grooves 203 on the inner walls of the first and second U-shaped shells 202 via T-shaped buckles 205 on its lower left and right sides. This connection allows the U-shaped cover 204 to be smoothly installed on the U-shaped shell, facilitating the opening and closing of the cable tray and enabling convenient operation of the internal wiring. The U-shaped rubber pads fixed on the left and right sides of the U-shaped cover 204, after installation, are in close contact with the U-shaped positioning plate 207. The good elasticity and sealing properties of the U-shaped rubber pads effectively fill gaps, preventing moisture from seeping into the cable tray from the edges and enhancing its moisture-proof performance.
[0044] The U-shaped positioning plate 207 is fixedly connected to the U-shaped cover plate 204 in the middle. This connection method combines the U-shaped cover plate 204 with itself into a stable overall structure, providing additional support and precise positioning for the U-shaped cover plate 204. This ensures that the U-shaped cover plate 204 maintains a stable position during use, thereby maintaining the sealing of the cable tray and improving the moisture-proof effect. The connecting ears 208 on the left and right sides of the lower end of the U-shaped positioning plate 207 cooperate with the threaded holes 4 on the surface of the experimental plate 1. The fixing bolts 5 pass through the holes to secure the connection, thus firmly fixing the U-shaped positioning plate 207 to the experimental plate 1. This achieves the purpose of stably installing the entire cable tray structure on the experimental plate 1, ensuring that the cable tray remains stable in various environments and preventing displacement from damaging the moisture-proof structure.
[0045] Mounting assembly 3 is fixed inside the inner protective shell 211, which is tightly connected to the first and second U-shaped shells 202 via triangular reinforcing ribs 210. Mounting assembly 3 consists of interconnected first and second square frames 301 and 302, and four support columns 303 connecting them. This structural design provides an orderly space for the arrangement and organization of wires, facilitating the rational routing of wires and preventing messy wiring from affecting the performance of the cable tray. Two mounting plates 304 are connected to the top and bottom of the four support columns 303, with slots 305 on their surfaces for inserting limiting baffles 306. This installation method effectively separates the wires, ensuring neat and orderly arrangement, reducing the risk of decreased cable tray sealing due to wire compression or tangling, and further enhancing moisture resistance.
[0046] Working principle: First, the user installs the first U-shaped positioning plate 207 slot and the second U-shaped positioning plate 207 slot on the top of the experimental board 1. By fixing the first U-shaped positioning plate 207 slot and the second U-shaped positioning plate 207 slot to the top of the experimental board 1, the purpose of providing a basic framework for subsequent wiring and installation of various components is achieved, so that the wire trough is stably placed on the experimental board 1.
[0047] Next, the mounting component 3 is placed inside the inner protective shell 211 inside the first U-shaped positioning plate 207 groove and the second U-shaped positioning plate 207 groove. The inner protective shell 211 is used to accommodate and initially position the mounting component 3, thereby providing a specific installation space for the mounting component 3 and ensuring that the position of the mounting component 3 in the U-shaped positioning plate 207 groove is relatively stable.
[0048] Subsequently, the wires that need to be threaded through are passed through the inside of the first square frame 301 and the second square frame 302. The first square frame 301 and the second square frame 302, as part of the mounting assembly 3, provide passageways for the wires, guiding their direction. By inserting the limiting baffle 306 into the slot 305 at the top of the mounting plate 304, the cooperation between the limiting baffle 306 and the slot 305 separates the wires, ensuring they are arranged in an orderly manner and preventing tangling, thus facilitating subsequent wiring management and maintenance.
[0049] Subsequently, through the locking design of the T-shaped groove 203 on the upper end of the inner wall of the first U-shaped positioning plate 207 and the second U-shaped positioning plate 207, and the T-shaped buckles 205 on both sides of the U-shaped positioning plate 207 cover plate, the U-shaped positioning plate 207 cover plate is installed on the first U-shaped positioning plate 207 groove and the second U-shaped positioning plate 207 groove. The mutual engagement of the T-shaped groove and the T-shaped buckles 205 realizes the vertical positioning and fixing of the U-shaped positioning plate 207 cover plate, thereby preventing the U-shaped positioning plate 207 cover plate from moving up and down and ensuring the sealing of the cable tray.
[0050] Finally, the two ends of the first U-shaped positioning plate 207 groove, the second U-shaped positioning plate 207 groove, and the U-shaped positioning plate 207 cover plate are inserted into the left and right sides of the U-shaped positioning plate 207. This insertion method further positions the U-shaped positioning plate 207 groove and the U-shaped positioning plate 207 cover plate horizontally. Then, the U-shaped positioning plate 207 is installed on the surface of the experimental plate 1 using fixing bolts 5. The tightening action of the fixing bolts 5 secures the entire cable tray structure to the experimental plate 1, ensuring the stability of the cable tray's position during use.
[0051] When encountering water and humid environments, the slot and opening design of the first U-shaped positioning plate 207 type groove and the second U-shaped positioning plate 207 type groove, as well as the tight engagement between the rubber sleeves at both ends of the U-shaped positioning plate 207 type cover plate and the limiting positioning plate, through the cooperation of this sealing structure, prevent water and moisture from entering the inside of the wire trough, thereby ensuring that the wires inside the wire trough are not damp and preventing safety hazards caused by moisture.
[0052] Furthermore, when subjected to gravitational impact, the triangular reinforcing ribs 210 between the first U-shaped positioning plate 207 groove, the second U-shaped positioning plate 207 groove, and the inner protective shell 211, as well as the independent design of the mounting assembly 3, work together. The triangular reinforcing ribs 210 enhance the structural strength between the U-shaped positioning plate 207 groove and the inner protective shell 211, while the relatively independent and stable structure of the mounting assembly 3 disperses the impact force when subjected to gravitational impact, preventing moisture from directly contacting the wires due to structural damage in humid environments, further ensuring the safety of the cable tray in complex environments.
[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A compact cable tray with moisture-proof performance, comprising an experimental plate (1) and a fixing assembly (2), characterized in that; The experimental board (1) is fixedly connected to a fixing component (2) at its top. The fixing component (2) includes a first U-shaped shell (201), and a second U-shaped shell (202) is fixedly connected to one side of the first U-shaped shell (201). T-shaped grooves (203) are provided on the left and right sides of the upper end of the inner walls of the first U-shaped shell (201) and the second U-shaped shell (202). Two U-shaped cover plates (204) are slidably connected inside the first U-shaped shell (201) and the second U-shaped shell (202). Two T-shaped buckles (205) are fixedly connected to the left and right sides of the lower end of the two U-shaped cover plates (204). Two U-shaped rubber sleeves (206) are fixedly connected to the left and right sides of the two U-shaped cover plates (204). A U-shaped positioning plate (207) is fixedly connected to the middle of the two U-shaped cover plates (204). Two connecting ears (208) are fixedly connected to the left and right sides of the lower end of the U-shaped positioning plate (207). U-shaped grooves (209) are opened on the left and right sides of the two U-shaped positioning plates (207).
2. The compact cable tray with moisture-proof performance according to claim 1, characterized in that; The lower ends of the inner walls of the first U-shaped shell (201) and the second U-shaped shell (202) are fixedly connected with triangular reinforcing ribs (210), and the upper surfaces of the three triangular reinforcing ribs (210) are fixedly connected with inner protective shells (211) that have undergone frosting treatment. The lower left and right sides of the inner protective shells (211) are arc-shaped.
3. A compact cable tray with moisture-proof performance according to claim 2, characterized in that; The inner protective shell (211) is fixedly connected to an installation component (3). The installation component (3) includes a first square frame (301), a second square frame (302) is fixedly connected to one side of the first square frame (301), and four support columns (303) are fixedly connected to the middle of the first square frame (301) and the second square frame (302).
4. A compact cable tray with moisture-proof performance according to claim 3, characterized in that; The four support columns (303) are perpendicular and parallel to each other in pairs, and two mounting plates (304) are fixedly connected to the top and bottom of the four support columns (303).
5. A compact cable tray with moisture-proof performance according to claim 4, characterized in that; The upper surfaces of the two mounting plates (304) are provided with a number of slots (305), and the interior of the two slots (305) is provided with a number of limiting baffles (306).
6. A compact cable tray with moisture-proof performance according to claim 1, characterized in that; Both connecting ears (208) and the experimental plate (1) are provided with threaded holes (4). The first U-shaped shell (201), the second U-shaped shell (202) and the U-shaped cover plate (204) are fixedly connected by a U-shaped positioning plate (207). The U-shaped positioning plate (207) is fixedly connected to the surface of the experimental plate (1) by fixing bolts (5).