Composite ventilation duct strength detection device and method

Abstract

The application relates to the technical field of composite ventilation duct strength detection, in particular to a composite ventilation duct strength detection device and method, which comprises a fixing unit and a detection unit. Two ends of two ventilation ducts are jointly closed by cooperation of a sealing frame and a separation frame plate, the surface of the ventilation ducts is not damaged, waste is avoided, two groups of detection data are obtained, the reliability of the detection results is improved, the breaking position of the ventilation duct is recorded under cooperation of the bulb in the sealing frame and the separation frame plate, analysis and reexamination are facilitated, the process of subsequent processing of the ventilation duct is adjusted, the sealing property of the ventilation duct is detected under cooperation of the bulb inside the connection position of the two ventilation ducts, and the practicability of the detection equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of composite ventilation duct strength testing technology, specifically to a composite ventilation duct strength testing device and method. Background Technology

[0002] Composite ventilation ducts are pipes used in ventilation systems that are made of a combination of multiple materials. The outer layer is generally made of metal, the middle layer is generally made of insulation material, and the inner layer is mostly made of polymer or composite materials. In order to ensure the quality of ventilation ducts, it is necessary to test the pressure resistance of composite ventilation ducts to determine whether they can maintain structural integrity and not break, deform or or otherwise damage them under the design pressure.

[0003] The traditional method for testing pressure resistance involves fixing an end cap plate with a vent tube to one end of a ventilation duct with screws, and sealing the other end with screws. Then, compressed gas is passed into the ventilation duct through a duct strength and tightness tester and maintained for a period of time. The instrument is used to observe whether the gas pressure changes, thereby determining whether the ventilation duct has deformed or cracked, and whether its pressure resistance meets the standard.

[0004] However, the entire testing process requires manual fixing of the end caps to the ventilation ducts, increasing the preparation steps before testing and thus increasing testing time. After testing, the qualified ventilation ducts have screw holes at both ends, making them difficult to reuse and resulting in waste. When the test result is unqualified, it is impossible to accurately locate the crack for analysis, making it difficult to adjust the production process of the ventilation ducts to improve their quality. The test only focuses on pressure resistance and cannot test the sealing performance of the ventilation ducts. Furthermore, the test is conducted on a single object, leading to low reliability of the test results. Summary of the Invention

[0005] In view of the above problems, this application provides a composite ventilation duct strength testing device and method to solve the technical problems of low testing efficiency, low reliability of testing results, inability to perform analysis and review, and waste caused by the inability to put the tested duct into use. To achieve the above objectives, this application provides the following technical solution.

[0006] An embodiment of this application discloses a composite ventilation duct strength testing device, comprising a fixing unit and a testing unit. The testing unit is mounted on the fixing unit and is used to test the pressure resistance and sealing performance of the ventilation duct. The fixing unit clamps and fixes two ventilation ducts. The fixing unit includes a fixing base, on which adjusting frames 1 are symmetrically arranged on the left and right sides. Adjusting frames 2 are symmetrically arranged on the fixing base and located between the adjusting frames 1. A distance control cylinder is fixedly installed at the upper middle part of the fixing base. A partition frame is fixedly installed at the telescopic end of the distance control cylinder. A sealing frame for sealing the opposite ends of the ventilation ducts is provided at the upper end of the adjusting frames 1. A rectangular frame plate for clamping and fixing the ventilation ducts is provided on the adjusting frames 1. Clamping frames 1 are provided at the opposite ends of the rectangular frame plate, and clamping frames 2 are provided at the facing ends of the rectangular frame plate. The testing unit includes two duct strength and tightness testers. The air outlets of the two duct strength and tightness testers are fixedly connected to the corresponding sealing frames. The duct strength and tightness testers are prior art and are not shown in the accompanying drawings.

[0007] According to an embodiment of the present invention, the adjustment frame includes a guide groove, and the lower end of the fixed base is symmetrically provided with guide grooves on the left and right. A sliding base slides in the guide grooves on the left and right. A bidirectional screw is rotatably connected to the fixed base. The left and right sides of the bidirectional screw are threadedly connected to the corresponding sliding bases. A connecting square column is symmetrically fixedly installed on the upper end of the sliding base. The connecting square column and the fixed base are slidably connected on the left and right. The front and rear opposite connecting square columns are fixedly connected together with the sealing frame.

[0008] According to an embodiment of the present invention, the adjustment frame two includes a rectangular bracket, and a rectangular bracket is symmetrically and slidably connected to the upper end of the fixed base. A bidirectional screw two is rotatably connected to the fixed base and located above the bidirectional screw one. The left and right sides of the bidirectional screw two are threadedly connected to the corresponding rectangular brackets. A rectangular frame plate is fixedly installed on the upper end of each rectangular bracket.

[0009] According to an embodiment of the present invention, the sealing frame includes a rectangular bonding plate, and the upper ends of the front and rear opposite connecting square columns are fixedly installed with rectangular bonding plates. The opposite ends of the two rectangular bonding plates are fixedly installed with U-shaped rubber plates, and the back ends of the two rectangular bonding plates are fixedly installed with vent pipes. The air outlets of the two air duct strength and tightness testers are fixedly connected to the corresponding vent pipes.

[0010] According to an embodiment of the present invention, the clamping frame includes a bidirectional threaded rod, two rectangular frame plates are symmetrically rotated vertically at opposite ends with bidirectional threaded rods, the same side of the two bidirectional threaded rods is threadedly connected to a pressing plate, the two pressing plates are symmetrically arranged horizontally, sprockets are fixedly installed at the front ends of the upper and lower bidirectional threaded rods, the two sprockets are connected by a toothed chain drive, and a control handle is fixedly installed at the front end of the upper bidirectional threaded rod.

[0011] According to an embodiment of the present invention, the part distribution arrangement of the second clamping frame is perpendicular to the part distribution arrangement of the first clamping frame.

[0012] According to an embodiment of the present invention, the partition frame is symmetrically fixedly installed with U-shaped rubber blocks on the left and right sides, and the opposite ends of the ventilation duct are fitted with mating plates. The opposite ends of the two mating plates are fixedly installed with rubber frame plates, and threaded holes are evenly opened on the mating plates along their outer contour lines.

[0013] According to an embodiment of the present invention, a glass block is fixedly installed in the middle of the partition frame plate, and a rectangular groove is formed in the middle of the glass plate and the upper side of the middle of the partition frame plate, and a light bulb is placed in the rectangular groove.

[0014] According to an embodiment of the present invention, glass blocks are fixedly installed around the opposite sides of the two rectangular bonding plates, and each glass block and the rectangular bonding plate are provided with a rectangular groove, in which a light bulb is placed.

[0015] The bulb is a high-power light source, and is existing technology, not shown in the accompanying drawings.

[0016] According to an embodiment of the present invention, the testing method of the above-mentioned composite ventilation duct strength testing device includes the following steps:

[0017] S1. Retrieval: First, take out the two ventilation ducts to be tested and insert them into the rectangular frame plates on the left and right sides respectively.

[0018] S2. Clamping and fixing: The clamping and fixing are achieved by clamping frame one and clamping frame two. The distance control cylinder drives the partition frame plate to move upward until it is aligned with the ventilation duct.

[0019] S3, Moving and Adhering: By adjusting the second frame, the ventilation ducts on the left and right sides move towards each other, so that the opposite ends of the ventilation ducts are closely attached to the partition frame.

[0020] S4. Moving seal: The adjusting frame moves the sealing frame toward the adjacent ventilation duct, so that the sealing frame cooperates with the partition frame plate to seal the left and right ends of the ventilation duct.

[0021] S5. Instrument Testing: Turn on the duct strength and tightness tester and introduce gas at the specified pressure into the ventilation duct. After maintaining this pressure for a period of time, observe whether the gas pressure changes to determine whether the duct strength meets the standard. If a change occurs, place an open light bulb into the partition frame and sealing frame, turn off the indoor light source, and record the area of ​​light leakage for subsequent adjustments in the ventilation duct processing.

[0022] S6. Light Leakage Detection: Turn off the duct strength and tightness tester. Move the control cylinder downwards to the partition plate until it no longer contacts the ventilation duct. Place the constantly lit bulb into the opposite openings of the ventilation ducts on both sides and continue to move the ventilation ducts towards each other until they are tightly fitted. Fix the ventilation ducts on both sides with bolts. The adjusting frame continues to move the sealing frame towards the adjacent ventilation duct so that the sealing frame seals the left and right ends of the ventilation duct. At this time, turn off the indoor light source and observe whether there is light leakage at the connection of the ventilation duct.

[0023] As can be seen from the above technical solutions, the present invention has the following advantages:

[0024] 1. In this invention, the sealing frame and the partition frame cooperate to seal both ends of the two ventilation ducts without damaging the duct surface, avoiding waste, and obtaining two sets of test data to increase the reliability of the test results. With the cooperation of the light bulbs inside the sealing frame and the partition frame, the rupture point of the ventilation duct is recorded, which is convenient for analysis and review, thereby adjusting the subsequent processing steps of the ventilation duct. With the cooperation of the light bulbs inside the connection of the two ventilation ducts, the sealing performance of the ventilation duct is tested, improving the practicality of the testing equipment.

[0025] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the composite ventilation duct strength testing device and method provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation. Attached Figure Description

[0026] 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.

[0027] Figure 1 A front-view stereoscopic structure diagram provided according to an embodiment of the present invention is shown.

[0028] Figure 2 A schematic diagram of the front sectional planar structure provided according to an embodiment of the present invention is shown.

[0029] Figure 3 A schematic diagram of the left sectional view of clamping frame one is shown.

[0030] Figure 4A schematic diagram of the left sectional planar structure of the rectangular bonding plate is shown.

[0031] Figure 5 A schematic diagram of the left sectional view of the partition frame is shown.

[0032] Figure 6 The detection process flowchart of the detection device is shown.

[0033] The above figures include the following reference numerals:

[0034] 1. Fixed unit; 11. Fixed base; 12. Adjusting frame one; 121. Sliding base; 122. Bidirectional screw one; 123. Connecting square column; 13. Adjusting frame two; 131. Rectangular bracket; 132. Bidirectional screw two; 14. Distance control cylinder; 15. Separating frame plate; 151. Rubber block; 152. Butt joint plate; 153. Rubber frame plate; 16. Sealing frame; 161. Rectangular bonding plate; 162. Rubber plate; 163. Vent pipe; 17. Rectangular frame plate; 18. Clamping frame one; 181. Bidirectional threaded rod; 182. Extrusion plate; 183. Sprocket; 184. Toothed chain belt; 185. Control handle; 19. Clamping frame two. Detailed Implementation

[0035] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] See Figure 1A composite ventilation duct strength testing device includes a fixing unit 1 and a testing unit. The testing unit is mounted on the fixing unit 1 and is used to test the pressure resistance and sealing performance of the ventilation duct. The fixing unit 1 clamps and fixes two ventilation ducts. The fixing unit 1 includes a fixing base 11, on which adjusting frames 12 are symmetrically arranged. Adjusting frames 13 are symmetrically arranged on the fixing base 11 and between the adjusting frames 12. A distance control cylinder 14 is fixedly installed at the upper middle part of the fixing base 11. A telescopic end of the distance control cylinder 14 is fixedly installed with... The upper end of the partition frame 15 and the adjustment frame 12 is provided with a sealing frame 16 to seal the opposite end of the ventilation duct. The adjustment frame 12 is provided with a rectangular frame 17 to clamp and fix the ventilation duct. The opposite ends of the rectangular frame 17 are provided with clamping frames 18, and the opposite ends of the rectangular frame 17 are provided with clamping frames 2 19. The detection unit includes two duct strength and tightness testers. The air outlets of the two duct strength and tightness testers are fixedly connected to the corresponding sealing frames 16. The duct strength and tightness testers are prior art and are not shown in the drawings.

[0037] See Figure 2 The second adjustment frame 13 includes a rectangular support 131. The rectangular support 131 is symmetrically and slidably connected to the upper end of the fixed base 11. The second bidirectional screw 132 is rotatably connected to the fixed base 11 and located on the upper side of the first bidirectional screw 122. The left and right sides of the second bidirectional screw 132 are threadedly connected to the corresponding rectangular support 131. A rectangular frame plate 17 is fixedly installed on the upper end of the rectangular support 131.

[0038] See Figure 3 The clamping frame 18 includes a bidirectional threaded rod 181. Two rectangular frame plates 17 are symmetrically rotated vertically at opposite ends with bidirectional threaded rods 181. The same side of the two bidirectional threaded rods 181 is threadedly connected to a pressing plate 182. The two pressing plates 182 are arranged symmetrically from left to right. A sprocket 183 is fixedly installed at the left end of both the upper and lower bidirectional threaded rods 181. The two sprockets 183 are connected by a toothed chain belt 184. A control handle 185 is fixedly installed at the front end of the upper bidirectional threaded rod 181.

[0039] See Figure 1 The part distribution arrangement of the second clamping frame 19 is perpendicular to the part distribution arrangement of the first clamping frame 18.

[0040] First, take out two ventilation ducts to be tested and insert them into the rectangular frame plates 17 on the left and right sides respectively. Manually turn the control handle 185. With the cooperation of the sprocket 183 and the toothed chain belt 184, the two double-threaded rods 181 rotate together, driving the extrusion plate 182 to move towards each other, so that the extrusion plate 182 is in close contact with the ventilation duct. The clamping frame 19 is operated in the same way to achieve the purpose of clamping and fixing the ventilation duct. The distance control cylinder 14 drives the partition frame plate 15 to move upward until it is aligned with the ventilation duct. The external motor drives the double-threaded rod 132 to drive the rectangular bracket 131 to move towards each other, thereby driving the ventilation ducts on the left and right sides to move towards each other, so that the opposite ends of the ventilation ducts are in close contact with the partition frame plate 15.

[0041] See Figure 2 The adjustment frame 12 includes a guide groove. The lower end of the fixed base 11 is symmetrically provided with guide grooves. A sliding base 121 slides in the guide groove. A bidirectional screw 122 is rotatably connected to the fixed base 11. The left and right sides of the bidirectional screw 122 are threadedly connected to the corresponding sliding base 121. A connecting square column 123 is symmetrically fixedly installed at the upper end of the sliding base 121. The connecting square column 123 and the fixed base 11 are slidably connected. The front and rear opposite connecting square columns 123 are fixedly connected together with the sealing frame 16.

[0042] See Figure 2 The sealing frame 16 includes a rectangular bonding plate 161. The upper ends of the front and rear opposite connecting square columns 123 are fixedly installed with rectangular bonding plates 161. The opposite ends of the two rectangular bonding plates 161 are fixedly installed with U-shaped rubber plates 162. The back ends of the two rectangular bonding plates 161 are fixedly installed with vent pipes 163. The air outlets of the two air duct strength and tightness testers are fixedly connected to the corresponding vent pipes 163.

[0043] An external motor drives a bidirectional screw 122, which in turn moves the connecting square column 123 toward the fixed base 11. This causes the rectangular bonding plate 161 to move toward the adjacent ventilation duct, allowing the rubber plate 162 on the rectangular bonding plate 161 to engage with the partition frame plate 15, sealing both ends of the ventilation duct. A duct strength and tightness tester is then used to introduce gas at a specified pressure into the ventilation duct. After maintaining this pressure for a period of time, the pressure is observed to determine if the duct strength meets the standard. If no change occurs, the pressure resistance of the ventilation duct meets the standard.

[0044] See Figure 2 The partition frame plate 15 is symmetrically fixed with U-shaped rubber blocks 151 on the left and right sides. The opposite ends of the ventilation duct are fitted with mating plates 152. The opposite ends of the two mating plates 152 are fixed with rubber frame plates 153. Threaded holes are evenly opened on the mating plates 152 along their outer contour lines.

[0045] See Figure 5 A glass block is fixedly installed in the middle of the partition frame plate 15. A rectangular groove is opened in the middle of the glass plate and the upper side of the middle of the partition frame plate 15, and a light bulb is placed in the rectangular groove.

[0046] See Figure 4 Glass blocks are fixedly installed around the opposite sides of the two rectangular bonding plates 161. Each glass block and the rectangular bonding plate 161 have a rectangular groove, and a light bulb is placed in the rectangular groove.

[0047] The bulb is a high-power light source, and is existing technology, not shown in the accompanying drawings.

[0048] If any changes occur, place an open light bulb into the partition frame 15 and the rectangular bonding plate 161 and position it. Turn off the indoor light source and record the light leakage area for adjustment in subsequent ventilation duct processing. Turn off the duct strength and tightness tester. The distance control cylinder 14 moves the partition frame 15 downward until it no longer contacts the ventilation duct. Place the constantly lit light bulb into the ventilation ducts on both sides and make the ventilation ducts continue to move towards each other until the ventilation ducts fit tightly together. Fix the ventilation ducts on both sides with bolts. Turn off the indoor light source and observe whether there is light leakage at the connection of the ventilation ducts.

[0049] See Figure 6 The testing method for the aforementioned composite ventilation duct strength testing device includes the following steps:

[0050] S1. Retrieval: First, take out the two ventilation ducts to be tested and insert them into the rectangular frame plates 17 on the left and right sides respectively.

[0051] S2. Clamping and fixing: The clamping and fixing are performed by clamping frame 18 and clamping frame 2 19. The distance control cylinder 14 drives the partition frame plate 15 to move upward until it is aligned with the ventilation duct.

[0052] S3, Moving and Adhering: By adjusting the second frame 13, the ventilation ducts on the left and right sides are moved towards each other, so that the opposite ends of the ventilation ducts are closely attached to the partition frame 15.

[0053] S4. Moving seal: The adjusting frame 12 drives the sealing frame 16 to move toward the adjacent ventilation duct, so that the sealing frame 16 cooperates with the partition frame plate 15 to seal the left and right ends of the ventilation duct.

[0054] S5. Instrument Testing: Turn on the duct strength and tightness tester and introduce gas at the specified pressure into the ventilation duct. After maintaining this pressure for a period of time, observe whether the gas pressure changes. Determine whether the duct strength meets the standard. If a change occurs, place an open light bulb into the partition frame 15 and the sealing frame 16, turn off the indoor light source, and record the light leakage area for subsequent adjustments in the ventilation duct processing.

[0055] S6. Light Leakage Detection: Turn off the duct strength and tightness tester. The distance control cylinder 14 moves the partition plate 15 downwards until it no longer contacts the ventilation duct. Place the constantly lit light bulb into the opposite openings of the ventilation ducts on both sides and make the ventilation ducts continue to move towards each other until the ventilation ducts fit tightly together. Fix the ventilation ducts on both sides with bolts. The adjustment frame 12 continues to move the sealing frame 16 toward the adjacent ventilation duct so that the sealing frame 16 seals the left and right ends of the ventilation duct. At this time, turn off the indoor light source and observe whether there is light leakage at the connection of the ventilation duct.

[0056] It should be noted that the air pressure inside the ventilation duct is accurately measured by the pressure sensor in the duct strength and tightness tester. The pressure sensor converts the pressure signal into an electrical signal and transmits it to the pressure gauge, which can display the pressure value inside the ventilation duct in real time, making it convenient for operators to observe at any time.

[0057] In the description of this invention, it should be understood that the terms "center," "middle," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "end," "axial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0058] Furthermore, the terms "first," "second," "number one," "number two," "one," and "two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A composite ventilation duct strength testing device, characterized in that, It includes a fixing unit and a testing unit. The testing unit is located on the fixing unit and is used to test the pressure resistance and sealing performance of the ventilation duct. The fixing unit clamps and fixes the two ventilation ducts. The fixing unit includes a fixed base, on which an adjustment frame 1 is symmetrically arranged on the left and right sides, and on which an adjustment frame 2 is symmetrically arranged on the fixed base and between the adjustment frames 1. A distance control cylinder is fixedly installed at the upper middle part of the fixed base, and a partition frame plate is fixedly installed at the telescopic end of the distance control cylinder. A sealing frame for sealing the opposite end of the ventilation duct is provided at the upper end of the adjustment frame 1. A rectangular frame plate for clamping and fixing the ventilation duct is provided on the adjustment frame 1. Clamping frame 1 is provided at the opposite end of the rectangular frame plate, and clamping frame 2 is provided at the facing end of the rectangular frame plate. The testing unit includes two duct strength and tightness testers, and the air outlets of the two duct strength and tightness testers are fixedly connected to the corresponding sealing frames. The adjustment frame includes a guide groove. The lower end of the fixed base is symmetrically provided with guide grooves. A sliding base slides in the guide groove. A connecting square column is symmetrically fixedly installed at the upper end of the sliding base. The front and rear opposite connecting square columns are fixedly connected together with the sealing frame. The sealing frame includes a rectangular bonding plate, and the upper ends of the front and rear opposite connecting square columns are fixedly installed with the rectangular bonding plate; A glass block is fixedly installed in the middle of the partition frame plate. A rectangular groove is opened in the middle of the glass block and the upper side of the middle of the partition frame plate. A light bulb is placed in the rectangular groove. Glass blocks are fixedly installed around the opposite sides of the two rectangular bonding plates. Each glass block and the rectangular bonding plate have a rectangular groove, and a light bulb is placed in the rectangular groove.

2. The composite ventilation duct strength testing device according to claim 1, characterized in that: A bidirectional screw is rotatably connected to the fixed base. The left and right sides of the bidirectional screw are threaded to the corresponding sliding bases, and the connecting square column and the fixed base are slidably connected from left to right.

3. The composite ventilation duct strength testing device according to claim 1, characterized in that: The second adjustment frame includes a rectangular bracket. The upper end of the fixed base is symmetrically and slidably connected to the rectangular bracket. The fixed base is rotatably connected to the second bidirectional screw on the upper side of the first bidirectional screw. The left and right sides of the second bidirectional screw are threadedly connected to the corresponding rectangular bracket. The upper end of the rectangular bracket is fixedly installed with a rectangular frame plate.

4. The composite ventilation duct strength testing device according to claim 2, characterized in that: Two rectangular bonding plates are fixedly installed with U-shaped rubber plates at opposite ends, and two rectangular bonding plates are fixedly installed with ventilation pipes at opposite ends. The air outlets of the two air duct strength and tightness testers are fixedly connected to the corresponding ventilation pipes.

5. The composite ventilation duct strength testing device according to claim 1, characterized in that: The clamping frame includes a bidirectional threaded rod. Two rectangular frame plates are symmetrically rotated vertically at opposite ends with bidirectional threaded rods. The same side of the two bidirectional threaded rods is connected to a pressing plate. The two pressing plates are arranged symmetrically from left to right. The front ends of the upper and lower bidirectional threaded rods are fixedly mounted with sprockets. The two sprockets are connected by a toothed chain drive. The front end of the upper bidirectional threaded rod is fixedly mounted with a control handle.

6. The composite ventilation duct strength testing device according to claim 1, characterized in that: The part distribution arrangement of the second clamping frame is perpendicular to that of the first clamping frame.

7. The composite ventilation duct strength testing device according to claim 1, characterized in that: The partition frame is symmetrically fixed with U-shaped rubber blocks on the left and right sides. The ventilation ducts are fitted with mating plates at opposite ends. Rubber frame plates are fixedly installed at opposite ends of the two mating plates. Threaded holes are evenly opened on the mating plates along their outer contour lines.

8. The composite ventilation duct strength testing device according to claim 1, characterized in that: The testing method for the aforementioned composite ventilation duct strength testing device includes the following steps: S1. Retrieval: First, take out the two ventilation ducts to be tested and insert them into the rectangular frame plates on the left and right sides respectively; S2, clamping and fixing: clamping and fixing by clamping frame one and clamping frame two, the distance control cylinder drives the partition frame plate to move upward until it is aligned with the ventilation duct; S3, Moving and Adhering: By adjusting the second frame, the ventilation ducts on the left and right sides move towards each other, so that the opposite ends of the ventilation ducts are closely attached to the partition frame. S4. Moving seal: The adjusting frame moves the sealing frame toward the adjacent ventilation duct, so that the sealing frame cooperates with the partition frame plate to seal the left and right ends of the ventilation duct. S5. Instrument Testing: Turn on the duct strength and tightness tester and introduce gas at the specified pressure into the ventilation duct. After maintaining this pressure for a period of time, observe whether the gas pressure changes. Determine whether the duct strength meets the standard. If it changes, place an open light bulb into the partition frame and sealing frame, turn off the indoor light source, and record the light leakage area for subsequent adjustments in the ventilation duct processing steps. S6. Light Leakage Detection: Turn off the duct strength and tightness tester. Move the control cylinder downwards to the partition plate until it no longer contacts the ventilation duct. Place the constantly lit bulb into the opposite openings of the ventilation ducts on both sides and continue to move the ventilation ducts towards each other until they are tightly fitted. Fix the ventilation ducts on both sides with bolts. The adjusting frame continues to move the sealing frame towards the adjacent ventilation duct so that the sealing frame seals the left and right ends of the ventilation duct. At this time, turn off the indoor light source and observe whether there is light leakage at the connection of the ventilation duct.

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