Method for detecting welding defects in air intake resonators

Abstract

The application discloses a kind of air intake resonator welding defect detection methods, S1, through clamping rotating mechanism clamping in air intake resonator resonator box;S2, air supply and return unit is connected with manifold and throat pipe in air intake resonator respectively, and plug is connected with air intake pipe;S3, start air supply and return unit work, mixed gas in air supply and return unit is input to air intake resonator, work station controls gas detection mechanism work, gas detection mechanism moves around in each weld of air intake resonator part, after first detection whether mixed gas leaks in each weld of air intake resonator, clamping rotating mechanism drives resonator box to rotate and makes entire air intake resonator rotate 180 °, gas detection mechanism moves around in another part of each weld of air intake resonator, and second detection whether mixed gas leaks in each weld of air intake resonator is carried out.The application has the advantages of detection efficiency, shortens delivery cycle.

Description

Technical Field

[0001] This invention relates to the field of automotive intake resonator testing, and more specifically to a method for detecting welding defects in intake resonators. Background Technology

[0002] An intake resonator is a technology in automotive intake systems that utilizes pressure fluctuations to improve intake efficiency. It consists of a resonant system composed of pipes, a resonant box, and a resonant tube. Its core principle is to create a positive pressure wave by reflecting and superimposing the negative pressure wave generated at the intake valve. At a specific engine speed, this positive pressure wave is synchronized with the valve cycle, increasing the pressure in the pipes and thus increasing the intake volume of the cylinder.

[0003] Figure 1 The intake resonator shown includes a resonator housing 1, an intake pipe 2, a manifold 3, a throat 4, a first bracket 5, and a second bracket 6. The resonator housing 1 includes an upper housing and a lower housing, which are fixed together by welding. The intake pipe 2 and the throat 4 are connected to the inner cavity of the resonator housing 1 and are welded to the resonator housing 1 respectively. The manifold 3 is welded to the intake pipe 2. During the welding process, welding defects may exist in these welded parts, such as cracks, porosity, slag inclusions, incomplete penetration, incomplete fusion, undercut, weld beads, pits, burn-through, etc. Welding defects can lead to air leakage in the intake resonator. Since the intake resonator is part of the car's intake system, when the intake resonator leaks, it can cause unstable engine idling or vibration, weak acceleration, and increased fuel consumption. In severe cases, the engine malfunction indicator lamp will illuminate. Turbocharged models experience more noticeable power loss and may also hear backfiring in the intake pipe. Therefore, the airtightness of the intake resonator must be tested after manufacturing.

[0004] Currently, most methods for testing intake resonators involve immersing the intake resonator, which is connected to an air tube, in water, introducing air into the intake resonator through the air tube, and observing whether continuous bubbles are generated in the water. If no bubbles are generated, it indicates that the welded parts of the intake resonator are airtight and the weld is qualified. If bubbles are generated, it indicates that the welded parts of the intake resonator are airtight and the weld is unqualified.

[0005] However, immersing the intake resonator in water presents challenges. Some leaks are extremely small, resulting in tiny bubbles that require careful and repeated observation to detect, leading to a prolonged observation period. After removing the intake resonator from the water, water residue remains on its surface, necessitating air drying or blow-drying before shipment. This further extends delivery time. Additionally, although intake pipes 2, 3, and 4 are sealed before immersion, water may still enter these components when the seals are removed. Since small amounts of water are difficult to detect, they can remain in these components for extended periods. When the product is connected to the intake system, this moisture can enter the engine during initial use, negatively impacting the engine. Summary of the Invention

[0006] This invention provides a method for detecting welding defects in air intake resonators, which improves detection efficiency and shortens delivery cycle.

[0007] A method for detecting welding defects in an intake resonator includes a gas supply and return unit, a plug, a gas detection mechanism, a clamping and rotating mechanism, and an industrial control computer electrically connected to the gas detection mechanism. The gas supplied to the intake resonator by the gas supply and return unit is a mixture of hydrogen and nitrogen. The following steps are used to check for gas mixture leakage at each weld joint of the intake resonator: S1, clamping the resonant box in the intake resonator through the clamping and rotating mechanism; S2, connect the supply and return air units to the manifold and throat in the intake resonator respectively, and connect the plug to the intake pipe; S3, the gas supply and return unit is started. The mixed gas in the gas supply and return unit is input into the intake resonator. The industrial control computer controls the gas detection mechanism to work. The gas detection mechanism moves around a part of each weld on the intake resonator to perform the first detection of whether there is a mixed gas leak at each weld of the intake resonator. Then, the clamping and rotating mechanism drives the resonator box to rotate, making the entire intake resonator rotate 180°. The gas detection mechanism moves around another part of each weld on the intake resonator to perform the second detection of whether there is a mixed gas leak at each weld of the intake resonator.

[0008] The operation process of this invention is as follows: the intake resonator is clamped by a clamping and rotating mechanism. After the intake resonator is connected to the gas supply and return unit, the industrial control computer controls the gas detection mechanism to move along each weld seam to detect whether there is a nitrogen-hydrogen mixed gas leaking from the weld seam. Although the hydrogen sensor of the gas detection mechanism is in the atmosphere inside the workshop, the atmosphere inside the workshop does not contain hydrogen. During the detection process, whenever the hydrogen sensor detects the presence of hydrogen when it moves around each weld seam, it indicates that the hydrogen is leaking from each weld seam, thus indicating that there is a defect in the weld seam, and the intake resonator is a defective product.

[0009] As can be seen from the above, when using this invention to test the intake resonator, the entire process is carried out in air. Instead, a gas detection mechanism is used to detect whether hydrogen is present at each weld. The detection signal from the gas detection mechanism is transmitted to the industrial control computer, which determines whether there are welding defects in the intake resonator. The entire testing process does not require manual observation for gas leakage, the testing process is short, and qualified products do not need to be dried or air-dried and can be delivered directly to the user, shortening the delivery cycle. In addition, since this method does not involve water, it avoids bringing water into the various pipes in the intake resonator when disassembling the supply and return air units. Attached Figure Description

[0010] Figure 1 This is a structural diagram of a conventionally manufactured intake resonator.

[0011] Figure 2 This is a three-dimensional view of the intake resonator welding defect detection.

[0012] Figure 3 In order to be in Figure 2 This is a diagram showing the parts that have been partially hidden.

[0013] Figure 4 In order to be in Figure 3 This is a diagram showing the parts that have been partially hidden.

[0014] Figure 5 In order to be in Figure 4 This is an image that shows some parts hidden and viewed from another angle.

[0015] The markings in the attached diagram are: resonant box 1, first sidewall 1a, second sidewall 1b, boss 1c, air intake pipe 2, manifold 3, throat 4, first support 5, and second support 6.

[0016] Gas detection mechanism A, clamping and rotating mechanism B, industrial computer C, gas supply and return unit 11, plug 12, hydrogen sensor 13, industrial robotic arm 14, workbench 21, support 22, rotary driver 23, connecting plate 24, first support 25, step 25a, first support plate 25b, second support plate 25c, second support 26, third support plate 26a, fourth support plate 26b, fixing plate 26c, cavity 26d, first linear driver 27, first connecting arm 28, first clamping member 29, second linear driver 30, pressure plate 31, third pressure application assembly 32. Detailed Implementation

[0017] like Figures 1 to 5 The method for detecting welding defects in an intake resonator according to the present invention includes a gas supply and return unit 11, a plug 12, a gas detection mechanism A, a clamping and rotating mechanism B, and an industrial control computer C electrically connected to the gas detection mechanism A. The following is a detailed description.

[0018] The gas supplied to the intake resonator by the gas supply and return unit 11 is a mixture of hydrogen and nitrogen. During the entire detection process, nitrogen mainly plays an inert protective role, responsible for isolation and dilution. Utilizing the chemical stability of nitrogen and its resistance to reaction with other substances, it displaces air (especially oxygen) to prevent the metal from being oxidized at high temperatures. At the same time, it can also reduce the risk of hydrogen combustion and explosion, making the entire atmosphere safer and more controllable.

[0019] The gas supply and return unit 11 includes a gas storage tank, a gas supply pump, a gas delivery pipe, a first pipe connector, a return pipe, and a second pipe connector. The gas supply pump is connected to the gas storage tank. One end of the gas delivery pipe is connected to the output end of the gas supply pump, and the other end of the gas delivery pipe is fixed to the first pipe connector. The first pipe connector is fixed to the throat pipe 4. One end of the second pipe connector is fixed to the manifold 3, and the other end of the second pipe connector is connected to one end of the return pipe. The other end of the return pipe is connected to the gas storage tank. When the gas supply pump is working, it extracts the mixed gas from the gas storage tank. The mixed gas enters the resonant box 1 along the gas delivery pipe, the first pipe connector, and the throat pipe 4. The mixed gas flows back to the gas storage tank from the inlet pipe 2, the manifold 3, the second pipe connector, and the return pipe.

[0020] The gas detection mechanism A includes a hydrogen sensor 13 and an industrial robotic arm 14. The hydrogen sensor 13 is used to detect hydrogen in the mixed gas. The hydrogen sensor 13 is fixed to the industrial robotic arm 14, which is a mechatronic device that mimics the functions of a human arm, wrist, and hand. The industrial robotic arm can flexibly realize extension, rotation, and lifting movements. The industrial robotic arm 14 drives the hydrogen sensor 13 to move around each weld seam to detect whether the mixed gas leaks from each weld seam. The hydrogen sensor 13 and the industrial robotic arm 14 are electrically connected to the industrial control computer C.

[0021] The hydrogen sensor 13 continuously feeds back detection signals to the industrial computer C. The industrial computer C determines the presence of hydrogen based on the detection signals from the hydrogen sensor 13. If no hydrogen is detected, the weld is intact and free of defects. If hydrogen is detected, a weld defect exists. The industrial computer C then sends control signals to the industrial robotic arm 14, causing it to move along a designated path around each weld.

[0022] In this embodiment, two clamping and rotating mechanisms B are preferably used. When the first clamping and rotating mechanism B is operating in the detection process, the second clamping and rotating mechanism B is used to clamp the intake resonator. After the gas detection mechanism A has completed the detection of the intake resonator on the first clamping and rotating mechanism B, since the intake resonator has been clamped on the second clamping and rotating mechanism B, the industrial control computer C controls the gas detection mechanism A to immediately switch from the position of the first clamping and rotating mechanism B to the position of the second clamping and rotating mechanism B to detect the intake resonator clamped on the second clamping and rotating mechanism B. When the second clamping and rotating mechanism B is operating in the detection process, the first clamping and rotating mechanism B is used to clamp the intake resonator. This process is repeated alternately to improve the detection efficiency.

[0023] The clamping and rotating mechanism B includes a worktable 21, a bracket 22, a rotary driver 23, a connecting plate 24, a first support 25, a second support 26, and a pressure application component. The gas detection mechanism A, the industrial computer C, and the bracket 22 are all fixed on the upper end of the worktable 21. Casters are installed on the lower end of the worktable 21, which allows the entire device to be moved easily. The casters are two casters with a self-locking structure. This type of caster is existing technology and will not be described in detail here.

[0024] The rotary driver 23 is fixed to the bracket 22. In this embodiment, the rotary driver 23 consists of a motor and a reducer assembly. The motor and reducer are fixed, and the reducer is fixed to the bracket 22. The torque output end of the motor is connected to the input end of the reducer. A through hole is provided on the bracket 22. The torque output end of the reducer cooperates with the through hole on the bracket. One end of the connecting plate 24 is provided with a connecting shaft. The connecting shaft extends into the through hole on the bracket 22 and is fixed to the torque output end of the reducer. Preferably, a bearing is installed in the through hole of the bracket 22. The connecting shaft on the connecting plate 24 passes through the bearing and is fixed to the torque output end of the reducer. The bearing provides support for the connecting plate 24. When the rotary driver 23 is working, the connecting plate 24 is driven to rotate by the rotary driver 23.

[0025] The first support 25 supports the resonant chamber 1 and has a step 25a that limits the position of the resonant chamber 1. A boss 1c is provided on the surface of the resonant chamber 1 opposite to the second sidewall 1b. This boss 1c abuts against the step 25a, thus limiting the position of the resonant chamber 1. The first support 25 is fixed to the connecting plate 24. The first support 25 includes a first support plate 25b and a second support plate 25c. After one end of the first support plate 25b is fixed to one end of the second support plate 25c, the first support plate 25b and the second support plate 25c are perpendicular to each other. The step 25a is located on the second support plate 25c.

[0026] The second support 26 is fixed to the connecting plate 24, and the second support 26 is arranged at intervals with the first support 25. The second support 26 includes a third support plate 26a, a fourth support plate 26b, and a fixing plate 26c fixed to the connecting plate 24. After one end of the third support plate 26a is fixed to one end of the fourth support plate 26b, the third support plate 26a and the fourth support plate 26b are perpendicular to each other. The other end of the fourth support plate 26b is fixed to the fixing plate 26c, and a cavity 26d is formed between the third support plate 26a, the fourth support plate 26b and the fixing plate 26c.

[0027] The pressure-applying components apply pressure to the resonant box 1. The pressure-applying components are respectively installed on the first support 25 and the second support 26. The pressure-applying components include a first pressure-applying component that applies pressure to the first side wall 1a of the resonant box 1 and a second pressure-applying component that applies pressure to the second side wall 1b of the resonant box 1. The power output directions of the first pressure-applying components are perpendicular to those of the second pressure-applying components. The first pressure-applying component includes a first linear actuator 27, a first connecting arm 28, and a first clamping member 29. The first linear actuator 27 is preferably a cylinder. The first linear actuator 27 is fixed to the first support 25. The power output end of the first linear actuator 27 is fixed to one end of the first connecting arm 28, and the other end of the first connecting arm 28 is fixed to the first clamping member 29.

[0028] In this embodiment, the first support plate 25b and the second support plate 25c are combined to make the first support 25 L-shaped. The first linear actuator 27 is preferably fixed to the first support plate 25b and is located on one side of the second support plate 25c. This arrangement positions the first linear actuator 27 within the space of the L-shaped first support 25, avoiding the first linear actuator 27 occupying other space and reducing the use of other parts to lower manufacturing costs. The first support 25 can both fix the first pressure-applying assembly and support the resonant enclosure 1. The other end of the first connecting arm 28 is located on the other side of the second support plate 25c, and the first clamping member 29 is threadedly connected to the other end of the first connecting arm 28. The first clamping member 29 is preferably a screw; by adjusting the position of the first clamping member 29, the pressure of the first pressure-applying assembly on the first sidewall 1a can be adjusted.

[0029] The second pressure-applying assembly includes a second linear actuator 30 and a pressure plate 31. The second linear actuator 30 is fixed to the second support 26, and the pressure plate 31 is fixed to the power output end of the second linear actuator 30. The second linear actuator 30 is preferably a cylinder. The second linear actuator 30 is fixed to the third support plate 26a and is located outside the cavity 26d. When the pressure plate 31 is in operation, it applies pressure to the second sidewall 1b of the resonant chamber 1.

[0030] The pressure-applying assembly also includes a third pressure-applying assembly 32 that applies pressure to the first support 5. The third pressure-applying assembly is fixed to the second support 26, and the power output directions of the third pressure-applying assembly and the second pressure-applying assembly are parallel. A portion of the first pressure-applying assembly 32 is located within the cavity 26d, and the first pressure-applying assembly 32 is fixed to the fourth support plate 26b. This embodiment makes full use of the space outside (outside the third support plate 26a) and inside (cavity 26d) of the second support 26 to install the second linear actuator 30 and the third pressure-applying assembly 32, respectively. This not only makes the structure compact and occupies less space, but also ensures high reliability in the positioning of the intake resonator.

[0031] This invention detects whether there is a gas mixture leak at each weld joint of the intake resonator through the following steps: S1, the resonant box 1 in the intake resonator is clamped by the clamping and rotating mechanism B. That is, the operator places the resonant box 1 on the second support plate 25c, so that the side wall of the boss 1c abuts against the step 25a, thereby limiting the position of the resonant box 1. The first linear actuator 27, the second linear actuator 30, and the third pressure application component 32 are activated respectively. The first linear actuator 27 drives the first connecting arm 28 and the first clamping member 29 to feed towards the resonant box 1 in a horizontal direction. The first clamping member 29 applies pressure to the first side wall 1a. The resonant box 1 is clamped between the first clamping member 29 and the step 25a. The second linear actuator 30 drives the pressure plate 31 to feed vertically into the resonant box 1, and the piston rod of the third pressure assembly 32 to feed vertically into the resonant box 1. The pressure plate 31 presses on the second side wall 1b, and the piston rod of the third pressure assembly 32 presses on the first bracket 5, thereby clamping the resonant box 1 between the second support plate 25c and the pressure plate 31 and the third pressure assembly 32. Thus, the clamping and rotating mechanism B completes the clamping of the resonant box 1.

[0032] S2, connect the air supply and return unit 11 to the manifold 3 and the throat 4 in the intake resonator respectively, and connect the plug 12 to the intake pipe 2; that is, fix the first pipe joint in the air supply and return unit 11 to the throat 4, and fix one end of the second pipe joint to the manifold 3.

[0033] S3, start the operation of the supply and return air unit 11. The mixed gas in the supply and return air unit 11 is input into the intake resonator. This process is to make the air supply pump in the supply and return air unit 11 extract the mixed gas in the storage tank. The mixed gas enters the resonator box 1 along the air supply pipe, the first pipe joint and the throat pipe 4. The mixed gas flows back to the storage tank from the intake pipe 2, manifold 3, second pipe joint and return air pipe.

[0034] Industrial computer C controls gas detection mechanism A to work. Gas detection mechanism A moves around a portion of each weld seam on the intake resonator to perform the first detection of whether there is a gas mixture leak at each weld seam of the intake resonator. Then, clamping and rotating mechanism B drives the resonator box 1 to rotate, causing the entire intake resonator to rotate 180°. Gas detection mechanism A then moves around another portion of each weld seam on the intake resonator to perform the second detection of whether there is a gas mixture leak at each weld seam of the intake resonator.

[0035] Since the first inspection can only detect a portion of each weld, after the first inspection, the rotary driver 23 needs to be activated. The rotary driver 23 drives the connecting plate 24 to rotate 180°, thereby causing the clamping rotating mechanism B fixed on the connecting plate 24 to rotate 180°. The entire intake resonator rotates 180° along with the clamping rotating mechanism B. The second inspection then detects the remaining portion of each weld that was inspected in the first inspection. Although the hydrogen sensor 13 is in the atmosphere of the workshop, the atmosphere in the workshop does not contain hydrogen. Therefore, whether in the first or second inspection, if the hydrogen sensor 13 detects the presence of hydrogen as it moves around each weld, it indicates that the hydrogen is leaking from each weld, thus indicating a defect in the weld, and the intake resonator is a defective product.

[0036] In this invention, to avoid inaccurate detection due to equipment failure, before performing step S1, an intake resonator sample with one or more weld defects is fixed on the clamping and rotating mechanism, the supply and return air unit 11 is connected to the manifold 3 and throat 4 in the intake resonator sample respectively, and the plug 12 is connected to the intake pipe 2 in the intake resonator sample. The gas supply and return unit 11 is started, and the mixed gas in the gas supply and return unit 11 is input into the intake resonator sample. The industrial control computer C controls the gas detection mechanism A to work. The gas detection mechanism A moves around a portion of each weld on the intake resonator sample to perform the first detection of the leaking mixed gas at each weld of the intake resonator sample. Then, the clamping and rotating mechanism B drives the resonator box 1 of the intake resonator sample to rotate, so that the entire intake resonator sample rotates 180°. The gas detection mechanism A moves around another portion of each weld on the intake resonator sample to perform the second detection of the leaking mixed gas at each weld of the intake resonator sample. If the industrial control computer C determines that there is a gas leak at one or more welds of the intake resonator sample, then the intake resonator products produced in a conventional manner will be tested.

[0037] An intake resonator sample with welding defects is fixed on the clamping and rotating mechanism B. The intake resonator sample is connected to the gas supply and return unit 11, and the gas detection mechanism A and the industrial control computer C are started. The hydrogen sensor 13 detects each weld. If the industrial control computer C determines that there is a welding defect, it means that the entire testing equipment is not faulty and can be used to test conventionally produced intake resonators. If the industrial control computer C determines that there is no welding defect, since the intake resonator sample is known to have welding defects, it means that the entire testing equipment is faulty. In this case, the testing equipment should be repaired and the fault eliminated before testing conventionally produced intake resonators.

Claims

1. A method for detecting welding defects in an intake resonator, comprising an air supply and return unit (11) and a plug (12), characterized in that, It also includes a gas detection mechanism (A), a clamping and rotating mechanism (B), and an industrial control computer (C) electrically connected to the gas detection mechanism (A). The gas supplied by the gas supply and return unit (11) to the intake resonator is a mixture of hydrogen and nitrogen. The following steps are used to check for gas mixture leakage at each weld joint of the intake resonator: S1, clamp the resonant box (1) in the intake resonator by clamping rotation mechanism (B); S2, connect the supply and return air unit (11) to the manifold (3) and throat (4) in the intake resonator respectively, and connect the plug (12) to the intake pipe (2); S3, start the gas supply and return unit (11) to work, the mixed gas in the gas supply and return unit (11) is input into the intake resonator, the industrial control computer (C) controls the gas detection mechanism (A) to work, the gas detection mechanism (A) moves around a part of each weld on the intake resonator, and performs the first detection of whether there is a mixed gas leak at each weld of the intake resonator. Then the clamping and rotating mechanism (B) drives the resonator box (1) to rotate so that the entire intake resonator rotates 180°. The gas detection mechanism (A) moves around another part of each weld on the intake resonator to perform the second detection of whether there is a mixed gas leak at each weld of the intake resonator.

2. The method for detecting welding defects in an intake resonator according to claim 1, characterized in that, The gas detection mechanism (A) includes a hydrogen sensor (13) for detecting hydrogen. An industrial robotic arm (14) moves the hydrogen sensor (13) around each weld seam. The hydrogen sensor (13) is fixed to the industrial robotic arm (14). The hydrogen sensor (13) and the industrial robotic arm (14) are electrically connected to the industrial computer (C).

3. The method for detecting welding defects in an intake resonator according to claim 1, characterized in that, The clamping and rotating mechanism (B) includes: a support (22); Rotary actuator (23), the rotary actuator (23) is fixed to the bracket (22); The connecting disk (24) is driven to rotate by the rotary driver (23), and the connecting disk (24) is fixed to the torque output end of the rotary driver (23); The first support (25) is used to support the resonant box (1), and the first support (25) is fixed to the connecting plate (24); A second support (26) is fixed to the connecting plate (24), and the second support (26) is arranged at intervals from the first support (25); A pressure-applying assembly that applies pressure to the resonant box (1) is installed on the first support (25) and the second support (26).

4. The method for detecting welding defects in an intake resonator according to claim 3, characterized in that, The first support (25) is provided with a step (25a) to limit the position of the resonant box (1).

5. The method for detecting welding defects in an intake resonator according to claim 3, characterized in that, The pressure application assembly includes a first pressure application assembly that applies pressure to the first sidewall (1a) of the resonant chamber (1) and a second pressure application assembly that applies pressure to the second sidewall (1b) of the resonant chamber (1). The power output directions of the first pressure application assembly and the second pressure application assembly are perpendicular. The first pressure application assembly includes a first linear actuator (27), a first connecting arm (28), and a first clamping member (29). The first linear actuator (27) is fixed to the first support (25). The power output end of the first linear actuator (27) is fixed to one end of the first connecting arm (28), and the other end of the first connecting arm (28) is fixed to the first clamping member (29). The second pressure application assembly includes a second linear actuator (30) and a pressure plate (31). The second linear actuator (30) is fixed to the second support (26), and the pressure plate (31) is fixed to the power output end of the second linear actuator (30).

6. The method for detecting welding defects in an intake resonator according to claim 5, characterized in that, The first support (25) includes a first support plate (25b) and a second support plate (25c). After one end of the first support plate (25b) is fixed to one end of the second support plate (25c), the first support plate (25b) and the second support plate (25c) are perpendicular to each other. The first linear actuator (27) is fixed to the first support plate (25b) and is located on one side of the second support plate (25c). The other end of the first connecting arm (28) is located on the other side of the second support plate (25c). The first clamping member (29) is threadedly connected to the other end of the first connecting arm (28).

7. The method for detecting welding defects in an intake resonator according to claim 5, characterized in that, The pressure application assembly also includes a third pressure application assembly (32) that applies pressure to the first support (5). The third pressure application assembly is fixed to the second support (26), and the power output direction of the third pressure application assembly is parallel to that of the second pressure application assembly.

8. The method for detecting welding defects in an intake resonator according to claim 7, characterized in that, The second support (26) includes a third support plate (26a), a fourth support plate (26b), and a fixing plate (26c) fixed to the connecting plate (24). After one end of the third support plate (26a) is fixed to one end of the fourth support plate (26b), the third support plate (26a) and the fourth support plate (26b) are perpendicular to each other. The second linear actuator (30) is fixed to the third support plate (26a), and the other end of the fourth support plate (26b) is fixed to the fixing plate (26c). A cavity (26d) is formed between the third support plate (26a), the fourth support plate (26b), and the fixing plate (26c). A part of the first pressure-applying component (32) is located in the cavity (26d), and the first pressure-applying component (32) is fixed to the fourth support plate (26b).

9. The method for detecting welding defects in an intake resonator according to any one of claims 1 to 8, characterized in that, Before performing step S1, a sample of an intake resonator with one or more welds having leakage defects is fixed on the clamping and rotating mechanism. The supply and return air unit (11) is connected to the manifold (3) and throat (4) in the intake resonator sample, respectively. The plug (12) is connected to the intake pipe (2) in the intake resonator sample. Start the gas supply and return unit (11) to work. The mixed gas in the gas supply and return unit (11) is input into the intake resonator sample. The industrial control computer (C) controls the gas detection mechanism (A) to work. The gas detection mechanism (A) moves around a part of each weld on the intake resonator sample. After the first detection of the leaked mixed gas at each weld of the intake resonator sample, the clamping and rotating mechanism (B) drives the resonator box (1) of the intake resonator sample to rotate so that the entire intake resonator sample rotates 180°. The gas detection mechanism (A) moves around another part of each weld on the intake resonator sample. The second detection of the leaked mixed gas at each weld of the intake resonator sample is performed. If the industrial control computer (C) determines that there is gas leakage at one or several welds of the intake resonator sample, then the intake resonator products produced in a conventional manner are tested.

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