A tool for uniformly coating electrode surfaces

Abstract

This utility model relates to the field of surface coating technology and discloses a tool for uniformly coating electrode surfaces. The tool includes a body, a sliding frame fixedly connected to the outer wall of the body, grooves on both the front and rear sides of the outer wall of the sliding frame, a uniform coating mechanism slidably connected to the top of the outer wall of the sliding frame, a U-shaped frame slidably connected to the top of the outer wall of the sliding frame, a uniform coating mechanism on the outer wall of the U-shaped frame, a fixed frame fixedly connected to the top of the outer wall of the U-shaped frame, an auxiliary coating mechanism on the outer wall of the fixed frame, a barrier mechanism fixedly connected to the outer wall of the body, and a fixed mechanism on the top of the outer wall of the sliding frame. In this utility model, a connecting plate is slidably mounted on the outer wall of a telescopic rod. The telescopic rod and spring work together to dynamically compensate for pressure fluctuations caused by changes in coating viscosity. A locking plate is fixedly installed on the outer wall of the connecting plate, and a brush assembly is configured on the bottom outer wall of the telescopic rod. The entire mechanism achieves uniform coating.

Description

Technical Field

[0001] This utility model relates to the field of surface coating technology, and in particular to a tool for uniformly coating electrode surfaces. Background Technology

[0002] Electrodes are key components in electrochemical reactions. Made of conductive materials, they are used to transfer current and participate in the reaction. Their performance directly affects the reaction efficiency and stability. To improve electrode performance, scientists are constantly optimizing material structure and surface treatment processes. Electrode surface coating uniform coating tools can precisely control the coating thickness and distribution, ensuring that every detail reaches the ideal state. These tools use advanced technology to achieve automated operation, which greatly improves production efficiency and product consistency, bringing revolutionary progress to the field of electrode manufacturing.

[0003] Traditional electrode surface coating uniform coating tools typically employ mechanical scraping or spraying methods, moving the coating head along a fixed path to evenly distribute the coating material on the electrode surface. This relies on stable mechanical motion and precise flow control. However, these tools have significant shortcomings: coating accuracy is affected by mechanical wear, they struggle to adapt to complex curved surfaces, and coating thickness is easily affected by material viscosity and external environmental factors, resulting in poor uniformity. Existing coating tools have improved upon traditional methods by employing automated control systems and high-precision nozzles, combined with real-time monitoring and feedback to adjust coating parameters, thus enhancing coating consistency. However, in practical use, these devices lack an efficient uniform coating mechanism, leading to inconsistent coating thickness, increased material waste, and difficulty in meeting the manufacturing requirements of high-precision electrodes, thus hindering the overall improvement of the process. Therefore, a new electrode surface coating uniform coating tool is proposed to address these issues. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a tool for uniformly coating electrode surfaces, aiming to improve the situation in the prior art where there is a lack of efficient and uniform coating mechanisms, resulting in inconsistent coating thickness, increased material waste, and difficulty in meeting the manufacturing requirements of high-precision electrodes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a tool for uniformly coating an electrode surface, comprising a body, a sliding frame fixedly connected to the outer wall of the body, sliding grooves provided on both the front and rear sides of the outer wall of the sliding frame, a uniform coating mechanism slidably connected to the top of the outer wall of the sliding frame, a U-shaped frame slidably connected to the top of the outer wall of the sliding frame, a uniform coating mechanism provided on the outer wall of the U-shaped frame, a fixing frame fixedly connected to the top of the outer wall of the U-shaped frame, an auxiliary coating mechanism provided on the outer wall of the fixing frame, a barrier mechanism fixedly connected to the outer wall of the body, and a fixing mechanism provided on the top of the outer wall of the sliding frame;

[0006] The uniformizing mechanism includes a telescopic rod, the outer wall of which is fixedly connected to the top of the outer wall of the sliding frame. A connecting plate is slidably connected to the outer wall of the telescopic rod, a spring is fixedly connected to the outer wall of the connecting plate, a locking plate is fixedly connected to the top of the outer wall of the connecting plate, and a brush assembly is provided at the bottom of the outer wall of the telescopic rod.

[0007] As a further description of the above technical solution:

[0008] The fixing mechanism includes a support bar, the bottom of the outer wall of the support bar is fixedly connected to the top of the outer wall of the sliding frame, a horizontal bar is fixedly connected to the top of the outer wall of the support bar, a sliding rod is slidably connected to the outer wall of the horizontal bar, a pressing block is fixedly connected to the top of the outer wall of the sliding rod, and a magnetic groove is fixedly connected to the bottom of the outer wall of the sliding frame.

[0009] As a further description of the above technical solution:

[0010] The fixing mechanism also includes a magnetic suction plate, the top of which is fixedly connected to the bottom of the outer wall of the slide rod.

[0011] As a further description of the above technical solution:

[0012] The coating aid mechanism includes a flow tube, the outer wall of which is fixedly connected to the inner wall of the locking plate, and a material bottle is fixedly connected to the top of the outer wall of the flow tube. A limit ring is fixedly connected to the outer wall of the material bottle.

[0013] As a further description of the above technical solution:

[0014] The barrier mechanism includes a baffle, the outer wall of which is slidably connected to the inner wall of the sliding frame, a cylinder is fixedly connected to the bottom of the outer wall of the baffle, and a mounting groove is provided on the top of the outer wall of the machine body.

[0015] As a further description of the above technical solution:

[0016] The brush assembly includes a coarse brush, the top of the outer wall of which is fixedly connected to the bottom of the outer wall of the telescopic rod, and a fine brush slidably connected to the top of the outer wall of the sliding frame.

[0017] As a further description of the above technical solution:

[0018] Buffer pads are fixedly connected to the four corners of the bottom of the outer wall of the machine body, and a coating film is fixedly connected to the top of the outer wall of the sliding frame.

[0019] As a further description of the above technical solution:

[0020] The outer wall of the flow tube is fixedly connected to the outer wall of the U-shaped frame, and the flow tube is symmetrically distributed along the central axis of the U-shaped frame.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, a connecting plate is slidably assembled on the outer wall of the telescopic rod. The telescopic rod and the spring work together to dynamically compensate for pressure fluctuations caused by changes in the viscosity of the coating. A locking plate is fixedly installed on the top outer wall of the connecting plate, and a brush assembly is configured on the bottom outer wall of the telescopic rod. When processing high-viscosity coatings, the coarse brush first breaks up the material accumulation layer, and then the fine brush performs a smoothing operation. When processing low-viscosity coatings, the double scraper structure is used to shorten the scraping trajectory length and reduce the material flow time. The entire mechanism achieves uniform coating.

[0023] 2. In this utility model, the bottom outer wall of the support bar is firmly connected to the top outer wall of the sliding frame. A horizontal bar is fixedly mounted on the top outer wall of the support bar. The support bar and the horizontal bar cooperate with each other to provide a stable support foundation for the fixing mechanism and enhance its overall stability. The outer wall of the horizontal bar is slidably connected to a sliding rod. The sliding rod and the pressing block work together to perform the pressing operation on the coating material to ensure uniform and flat coating. A magnetic suction groove is fixedly set on the bottom outer wall of the sliding frame. The size of the magnetic suction groove is perfectly matched with the magnetic suction block. The magnetic adsorption effect is used to effectively keep the coating position flat and prevent displacement. Attached Figure Description

[0024] Figure 1 This is a perspective view of a tool for uniformly coating an electrode surface according to the present invention.

[0025] Figure 2 This is a front view of a tool for uniformly coating an electrode surface according to the present invention.

[0026] Figure 3 This is a side view of a tool for uniformly coating an electrode surface according to the present invention.

[0027] Figure 4 This is a top view of a tool for uniformly coating an electrode surface according to the present invention.

[0028] Figure 5 This is an exploded view of a tool for uniformly coating an electrode surface according to the present invention.

[0029] Legend:

[0030] 1. Machine body; 2. Sliding frame; 3. Evenly coating mechanism; 301. Telescopic rod; 302. Spring; 303. Connecting plate; 304. Clamping plate; 305. Brush assembly; 3051. Fine brush; 3052. Coarse brush; 4. U-shaped frame; 5. Auxiliary coating mechanism; 501. Material bottle; 502. Limiting ring; 503. Flow tube; 6. Barrier mechanism; 601. Cylinder; 602. Placement groove; 603. Baffle; 7. Slide groove; 8. Fixing mechanism; 801. Support bar; 802. Crossbar; 803. Slide rod; 804. Pressing block; 805. Magnetic suction plate; 806. Magnetic suction groove; 9. Buffer pad; 10. Coating film; 11. Fixing frame. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 2 and Figure 5This utility model provides an embodiment of a tool for uniformly coating electrode surfaces, comprising a body 1. The body 1 provides support and a mounting platform for the device, bearing and fixing all other components to ensure the overall structural stability and operational reliability of the equipment. A sliding frame 2 is fixedly connected to the outer wall of the body 1. Sliding grooves 7 are provided on both the front and rear sides of the outer wall of the sliding frame 2. A uniform coating mechanism 3 is slidably connected to the top of the outer wall of the sliding frame 2. A U-shaped frame 4 is slidably connected to the top of the outer wall of the sliding frame 2, allowing the U-shaped frame 4 to slide left and right on it. The uniform coating mechanism 3 is provided on the outer wall of the U-shaped frame 4. A fixed frame 11 is fixedly connected to the top of the outer wall of the U-shaped frame 4. An auxiliary coating mechanism 5 is provided on the outer wall of the fixed frame 11. The auxiliary coating mechanism 5 includes a flow pipe 503, which is a flow channel for the material used to assist in coating. The outer wall of the flow pipe 503 is fixedly connected to the inner wall of the locking plate 304. A material bottle 501 is fixedly connected to the top of the outer wall of the flow pipe 503, which adds a rheology modifier when dealing with high-concentration coatings to increase the coating efficiency. The coating exhibits thixotropic properties; its viscosity decreases under shear force during scraping, preventing accumulation. After scraping, the viscosity recovers rapidly, preventing stringing. For low-concentration coatings, a thickener is added to increase static viscosity and suppress flow. Simultaneously, the shear-thinning properties are maintained, ensuring smoothness during scraping. A limit ring 502 is fixedly connected to the outer wall of the material bottle 501 to engage and secure it to the mounting frame 11. A barrier mechanism 6 is fixedly connected to the outer wall of the machine body 1. The barrier mechanism 6 includes a baffle 603, which rises during low-viscosity coating scraping to form a physical barrier, preventing coating from flowing to the edges. During high-viscosity coating scraping, the baffle 603 lowers, ensuring normal coating. The outer wall of the baffle 603 is slidably connected to the inner wall of the sliding frame 2. A cylinder 601 is fixedly connected to the bottom of the outer wall of the baffle 603 to control its raising and lowering. A mounting groove 602 is provided at the top of the outer wall of the machine body 1 to fix the cylinder 601, ensuring its operational stability. A fixing mechanism 8 is provided at the top of the outer wall of the sliding frame 2.

[0033] The uniformizing mechanism 3 includes a telescopic rod 301. The outer wall of the telescopic rod 301 is fixedly connected to the top of the outer wall of the sliding frame 2. A connecting plate 303 is slidably connected to the outer wall of the telescopic rod 301. A spring 302 is fixedly connected to the outer wall of the connecting plate 303. The telescopic rod 301 and the spring 302 work together to dynamically compensate for pressure fluctuations caused by changes in the viscosity of the coating. A locking plate 304 is fixedly connected to the top of the outer wall of the connecting plate 303 for fixing the uniformizing mechanism 3. A brush assembly 305 is provided at the bottom of the outer wall of the telescopic rod 301. The brush assembly 305 includes a coarse brush 3052. The top of the outer wall of the coarse brush 3052 is fixedly connected to the bottom of the outer wall of the telescopic rod 301. A fine brush 3051 is slidably connected to the top of the outer wall of the sliding frame 2. High-viscosity coatings are first broken up by the coarse brush 3052 and then smoothed by the fine brush 3051. Low-viscosity coatings are shortened by the double scrapers to reduce the scraping path and flow time.

[0034] Specifically, the main body 1 serves as the foundational support structure for the entire device, providing an installation platform for all other components. A robust fixing method ensures the overall stability and operational reliability of the equipment. The outer wall of the main body 1 is fixedly connected to the sliding frame 2. The front and rear outer walls of the sliding frame 2 are equipped with sliding grooves 7. The top outer wall of the sliding frame 2 is slidably connected to the equalizing mechanism 3. Simultaneously, the top outer wall of the sliding frame 2 is also slidably connected to the U-shaped frame 4. This design allows the U-shaped frame 4 to move smoothly left and right on the sliding frame 2. The equalizing mechanism 3 is installed on the outer wall of the U-shaped frame 4. The top outer wall of the U-shaped frame 4 is fixedly connected to the fixing frame 11. The outer wall of the fixing frame 11 is equipped with an auxiliary covering mechanism 5. The core component of component 5 includes a flow tube 503, which is specifically designed to assist in the conveying and flow of coating materials. The outer wall of the flow tube 503 is fixedly connected to the inner wall of the locking plate 304. The top outer wall of the flow tube 503 is fixedly connected to the material bottle 501. The main function of the material bottle 501 is to add a rheology modifier to enhance the thixotropy of the coating when processing high-concentration coatings. During the coating process, the viscosity of the coating decreases when subjected to shear force, thus preventing material accumulation. After coating is completed, the coating viscosity can be quickly restored to effectively prevent stringing. When processing low-concentration coatings, a thickener is added to increase the static viscosity to inhibit coating flow, while maintaining the shear thinning characteristics of the coating to ensure that the flow performance during coating is not affected. The material bottle 501... The outer wall of the machine body 1 is equipped with a limiting ring 502, which is fixedly connected to securely fix the material bottle 501 to the fixing frame 11. The outer wall of the machine body 1 is also equipped with a barrier mechanism 6, which includes a baffle 603. The main function of the baffle 603 is to rise when scraping low-viscosity coatings to form a physical barrier to prevent the coating from flowing to the edge area. When scraping high-viscosity coatings, the baffle 603 is lowered so as not to affect the normal coating operation. The outer wall of the baffle 603 is slidably connected to the inner wall of the sliding frame 2. The bottom outer wall of the baffle 603 is equipped with a cylinder 601 through a fixed connection. The cylinder 601 is specifically used to control the lifting and lowering movement of the baffle 603. The top outer wall of the machine body 1 has a dedicated... The door is used to fix the mounting slot 602 of the cylinder 601. Its design can effectively ensure the operational stability of the cylinder 601. The top outer wall of the sliding frame 2 is also equipped with a fixing mechanism 8. The uniformizing mechanism 3 includes a telescopic rod 301. The outer wall of the telescopic rod 301 is fixedly connected to the top outer wall of the sliding frame 2. The outer wall of the telescopic rod 301 is slidably connected to the connecting plate 303. The outer wall of the connecting plate 303 is fixedly connected to a spring 302. The telescopic rod 301 and the spring 302 work together to achieve dynamic compensation, mainly used to balance the pressure fluctuations caused by changes in the viscosity of the coating. The top outer wall of the connecting plate 303 is fixedly connected to the locking plate 304. The locking plate 304 is specifically used to fix the uniformizing mechanism 3.The bottom outer wall of the telescopic rod 301 is equipped with a brush assembly 305, which includes a coarse brush 3052. The top outer wall of the coarse brush 3052 is fixedly connected to the bottom outer wall of the telescopic rod 301. The top outer wall of the sliding frame 2 is slidably connected to the fine brush 3051. When processing high-viscosity coatings, the coarse brush 3052 first breaks up the coating buildup, and then the fine brush 3051 smooths it out. When processing low-viscosity coatings, the double scraper structure shortens the scraping path, thereby reducing the coating flow time.

[0035] Reference Figure 3 and Figure 5 The fixing mechanism 8 includes a support bar 801. The bottom of the outer wall of the support bar 801 is fixedly connected to the top of the outer wall of the sliding frame 2. A horizontal bar 802 is fixedly connected to the top of the outer wall of the support bar 801. The support bar 801 and the horizontal bar 802 work together to provide strong support for the fixing mechanism 8 and improve its stability. A slide rod 803 is slidably connected to the outer wall of the horizontal bar 802. A pressing block 804 is fixedly connected to the top of the outer wall of the slide rod 803. The slide rod 803 and the pressing block 804 work together to press the coating. A magnetic groove 806 is fixedly connected to the bottom of the outer wall of the sliding frame 2. The magnetic groove 806 is the same size as the magnetic block. It uses magnetic force to keep the coating flat and avoid deviation.

[0036] Specifically, the fixing mechanism 8 includes a support bar 801. The bottom outer wall of the support bar 801 is firmly connected to the top outer wall of the sliding frame 2. A crossbar 802 is fixedly mounted on the top outer wall of the support bar 801. The support bar 801 and the crossbar 802 cooperate with each other to provide a stable support foundation for the fixing mechanism 8 and enhance its overall stability. The outer wall of the crossbar 802 is slidably connected to a slide rod 803. A pressing block 804 is fixedly installed on the top outer wall of the slide rod 803. The slide rod 803 and the pressing block 804 work together to perform a pressing operation on the coating material to ensure uniform and flat coating. A magnetic suction groove 806 is fixedly provided on the bottom outer wall of the sliding frame 2. The size of the magnetic suction groove 806 is perfectly matched with the magnetic suction plate 805. Utilizing magnetic adsorption, it effectively keeps the coating position flat and prevents displacement.

[0037] Reference Figure 1 , Figure 2 and Figure 3 The four corners of the bottom of the outer wall of the body 1 are fixedly connected to the buffer pads 9, which are used to buffer the vibration generated during the operation of the device. The top of the outer wall of the sliding frame 2 is fixedly connected to the coating film 10, which is a coating material. The outer wall of the flow tube 503 is fixedly connected to the outer wall of the U-shaped frame 4. The flow tube 503 is symmetrically distributed along the central axis of the U-shaped frame 4.

[0038] Specifically, buffer pads 9 are fixedly installed at the four corners of the bottom of the outer wall of the machine body 1. These components are specifically designed to mitigate the impact of vibration during equipment operation. A coating film 10 is fixedly installed on the top outer wall of the sliding frame 2. The material directly participates in the coating process. The outer wall of the flow pipe 503 is fixedly connected to the outer wall of the U-shaped frame 4. The flow pipe 503 is symmetrically distributed along the central axis in the structure of the U-shaped frame 4.

[0039] Working principle: First, the uniformizing mechanism 3 includes a telescopic rod 301, whose outer wall is fixedly connected to the top area of ​​the sliding frame 2. A connecting plate 303 is slidably mounted on the outer wall of the telescopic rod 301, and a spring 302 is fixedly mounted on the outer wall of the connecting plate 303. The telescopic rod 301 and the spring 302 work together to dynamically adjust the pressure fluctuations caused by changes in the viscosity of the coating. A locking plate 304 is fixedly installed on the top outer wall of the connecting plate 303, and its components are used to fix the entire uniformizing mechanism 3. A brush assembly 305 is configured on the bottom outer wall of the telescopic rod 301. The top of the coarse brush 3052 in the assembly is directly fixed to the bottom of the telescopic rod 301. A fine brush 3051 is slidably mounted on the top area of ​​the sliding frame 2. When processing high-viscosity materials, the coarse brush 3052 first breaks up the accumulated coating layer, and the fine brush 3051 then performs a fine smoothing process. When dealing with low-viscosity materials, a dual scraper collaborative mode is activated. By shortening the scraping trajectory, the material flow time is effectively controlled. The entire mechanism works together to ensure that the coating surface is uniformly covered.

[0040] Furthermore, the fixing mechanism 8 includes a support bar 801, the bottom outer wall of which is directly fixed to the top area of ​​the sliding frame 2, forming a solid foundation. The top outer wall of the support bar 801 is fitted with a horizontal bar 802. The support bar 801 and the horizontal bar 802 work together to provide a stable structural support frame for the fixing mechanism 8, greatly enhancing the stability of operation. The outer wall of the horizontal bar 802 allows the slide bar 803 to slide. The top of the slide bar 803 is fixedly installed with a pressing block 804. The slide bar 803 and the pressing block 804 work together to perform a uniform pressing operation of the coating material, ensuring that the coating is spread smoothly and without defects. The bottom outer wall of the sliding frame 2 is provided with a magnetic groove 806 structure. The size of the magnetic groove 806 corresponds exactly to the magnetic block assembly. Using the strong magnetic adsorption function, the position of the coating material is kept fixed, preventing movement and misalignment.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tool for uniformly coating an electrode surface, comprising a body (1), characterized in that: The outer wall of the body (1) is fixedly connected to a sliding frame (2). The front and rear sides of the outer wall of the sliding frame (2) are provided with sliding grooves (7). The top of the outer wall of the sliding frame (2) is slidably connected to a uniform mechanism (3). The top of the outer wall of the sliding frame (2) is slidably connected to a U-shaped frame (4). The outer wall of the U-shaped frame (4) is provided with a uniform mechanism (3). The top of the outer wall of the U-shaped frame (4) is fixedly connected to a fixed frame (11). The outer wall of the fixed frame (11) is provided with a covering mechanism (5). The outer wall of the body (1) is fixedly connected to a barrier mechanism (6). The top of the outer wall of the sliding frame (2) is provided with a fixing mechanism (8). The uniformizing mechanism (3) includes a telescopic rod (301), the outer wall of which is fixedly connected to the top of the outer wall of the sliding frame (2), a connecting plate (303) is slidably connected to the outer wall of the telescopic rod (301), a spring (302) is fixedly connected to the outer wall of the connecting plate (303), a locking plate (304) is fixedly connected to the top of the outer wall of the connecting plate (303), and a brush assembly (305) is provided at the bottom of the outer wall of the telescopic rod (301).

2. The electrode surface coating uniform coating tool according to claim 1, characterized in that: The fixing mechanism (8) includes a support bar (801), the bottom of the outer wall of the support bar (801) is fixedly connected to the top of the outer wall of the sliding frame (2), a horizontal bar (802) is fixedly connected to the top of the outer wall of the support bar (801), a sliding rod (803) is slidably connected to the outer wall of the horizontal bar (802), a pressing block (804) is fixedly connected to the top of the outer wall of the sliding rod (803), and a magnetic groove (806) is fixedly connected to the bottom of the outer wall of the sliding frame (2).

3. The electrode surface coating uniform coating tool according to claim 1, characterized in that: The fixing mechanism (8) also includes a magnetic suction plate (805), the top of the outer wall of the magnetic suction plate (805) is fixedly connected to the bottom of the outer wall of the slide rod (803).

4. The electrode surface coating uniform coating tool according to claim 1, characterized in that: The covering mechanism (5) includes a flow tube (503), the outer wall of which is fixedly connected to the inner wall of the locking plate (304), and a material bottle (501) is fixedly connected to the top of the outer wall of the flow tube (503). A limit ring (502) is fixedly connected to the outer wall of the material bottle (501).

5. The electrode surface coating uniform coating tool according to claim 1, characterized in that: The barrier mechanism (6) includes a baffle (603), the outer wall of the baffle (603) is slidably connected to the inner wall of the sliding frame (2), a cylinder (601) is fixedly connected to the bottom of the outer wall of the baffle (603), and a mounting groove (602) is provided on the top of the outer wall of the body (1).

6. The electrode surface coating uniform coating tool according to claim 1, characterized in that: The brush assembly (305) includes a coarse brush (3052), the top of the outer wall of the coarse brush (3052) is fixedly connected to the bottom of the outer wall of the telescopic rod (301), and a fine brush (3051) is slidably connected to the top of the outer wall of the sliding frame (2).

7. The electrode surface coating uniform coating tool according to claim 1, characterized in that: The outer wall of the body (1) is fixedly connected to four corners of the bottom, and the outer wall of the sliding frame (2) is fixedly connected to a coating film (10).

8. The electrode surface coating uniform coating tool according to claim 4, characterized in that: The outer wall of the flow tube (503) is fixedly connected to the outer wall of the U-shaped frame (4), and the flow tube (503) is symmetrically distributed along the central axis of the U-shaped frame (4).

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