A device for testing the air tightness of automotive exhaust manifolds

Abstract

This application discloses an exhaust manifold airtightness testing device, including a base, multiple positioning components, a drive device, multiple clamping components, and a transmission component. The positioning components are mounted on the top of the base and are sealed and inserted into the branch end of the manifold body, thereby limiting the horizontal position of the manifold body. The drive device is mounted on the bottom of the base, the clamping components are movably disposed on the top of the base, and the transmission component is disposed on the bottom of the base with its input end connected to the output end of the drive device. The output end of the transmission component is connected to the clamping components. The advantages of this application are: by limiting and fixing the manifold body at the branch end position, it avoids using clamps to hold its outer side, preventing missed tests due to clamp obstruction, and improving testing accuracy; furthermore, by using one drive device and transmission component to achieve the fixing action of multiple clamping components, it reduces the manufacturing cost of the device and the complexity of the control system, and improves the testing clamping efficiency.

Description

Technical Field

[0001] This application relates to the field of automotive parts processing technology, and in particular to an automotive exhaust manifold airtightness testing device. Background Technology

[0002] The exhaust manifold is a component closely connected to the engine cylinder block. Its core function is to collect the exhaust gases from each cylinder and guide them to the main exhaust pipe. The exhaust manifold is usually equipped with branched pipes to ensure smooth exhaust gas discharge. The exhaust manifold includes the main exhaust pipe and multiple exhaust branch pipes connected to the main exhaust pipe. The end faces of the multiple exhaust branch pipes are connected to form the large surface of the exhaust manifold. When designing the exhaust manifold, the focus is on reducing exhaust resistance and preventing mutual interference between cylinders.

[0003] After the manifold is manufactured, it needs to be tested for airtightness. The commonly used method is the wet test: gas is injected into the manifold and it is immersed in water. The presence of bubbles is observed to determine the leakage. Existing testing devices use multiple drive sources to limit and fix the manifold, and the clamps also abut against the outside of the manifold. This may result in missed detections at the clamped parts of the manifold (see, for example, patent CN223259164U). Therefore, how to improve the existing testing devices to overcome the above problems is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] One of the objectives of this application is to provide an easy-to-fix and observe automotive exhaust manifold airtightness testing device.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a vehicle exhaust manifold airtightness testing device, comprising a base, multiple positioning components, a drive device, multiple clamping components, and a transmission component. The positioning components are installed on the top of the base and are inserted into the branch end of the manifold body to limit the horizontal position of the manifold body. The drive device is installed at the bottom of the base, the clamping components are movably disposed on the top of the base, and the transmission component is disposed at the bottom of the base with its input end connected to the output end of the drive device. The output end of the transmission component is connected to the clamping component. During fixing, the drive device is adapted to drive the clamping component through the transmission component to perform two processes, wherein in the first process, the clamping component is adapted to rotate toward the branch end and correspond to it; in the second process, the clamping component is adapted to move downward until it abuts against the branch end, thereby limiting the vertical position of the manifold body.

[0006] Preferably, the clamping component includes a shaft and a pressure plate disposed at the top of the shaft, the shaft being movably inserted into the base; the transmission assembly includes a transmission rod and a mounting ring, the bottom end of the transmission rod being connected to the output end of the drive device, the upper end of the transmission rod engaging with the shaft via a guide structure, and the mounting ring being vertically and elastically mounted on the bottom end of the base and rotatably sleeved on the bottom end of the shaft; during the first process: the transmission rod moves downward and drives the shaft to rotate through the guide structure, at which time the mounting ring is adapted to remain stationary in the vertical direction under the action of elastic force; during the second process: the transmission rod is adapted to drive the shaft and the mounting ring to move downward synchronously, so that the pressure plate abuts against the branch pipe end.

[0007] Preferably, the guiding structure includes a guide block and a spiral guide groove. The guide block is disposed outside the transmission rod, and the guide groove is disposed inside the shaft. The transmission rod is adapted to achieve rotation of the shaft through the sliding engagement of the guide block and the guide groove.

[0008] Preferably, the clamping component includes a shaft and a pressure plate disposed at the top end of the shaft. The shaft is movably inserted into the base and cooperates with the base through a guide structure. The transmission assembly includes a transmission rod, the bottom end of which is connected to the output end of the drive device, and the top end of which is rotatably connected to the bottom end of the shaft. During the first process, the transmission rod moves downward and drives the shaft to rotate through the guide structure, at which time the shaft and the transmission rod move downward synchronously. During the second process, the shaft continues to move downward until the pressure plate abuts against the branch pipe end, at which time the shaft is adapted to remain stationary in the circumferential direction.

[0009] Preferably, the guiding structure includes a guide block and a guide groove. The guide block is disposed within the base, and the guide groove includes a vertically arranged and connected vertical section and a helical section. When the guide block engages with the helical section, the shaft is adapted to rotate and move axially. When the guide block engages with the vertical section, the shaft is adapted to move axially.

[0010] Preferably, the branch pipe end includes a pipe opening and a flange, and the positioning component includes a positioning block and a positioning post; when limiting the position, the positioning block cooperates with the pipe opening, the positioning post cooperates with the mounting hole of the flange, and the clamping member engages with the positioning post.

[0011] Preferably, the automotive exhaust manifold airtightness testing device further includes a water tank, a lifting device, and an inflation assembly. The lifting device is mounted above the water tank via a mounting bracket. The base is floatingly connected to the mounting bracket via a support. The support is connected to the output end of the lifting device. The support and the mounting bracket cooperate via a vibration assembly. During testing, the base is first adapted to be lowered into the water tank via the lifting device, and then the manifold body is adapted to vibrate under the action of the vibration assembly.

[0012] Preferably, the vibration assembly includes a fixing block and a connecting block. The fixing block is installed on the top of the mounting frame and has a plurality of spaced protrusions on its side near the support. The connecting block is installed on the support. The connecting block moves down and presses against the protrusions to achieve vibration of the manifold body.

[0013] Preferably, a ball is rotatably provided at the end of the connecting block, thereby enabling the connecting block to form a rolling engagement with the tooth.

[0014] Preferably, the connecting block is elastically rotatably mounted on the bracket; when the connecting block moves downward and engages with the convex tooth, the connecting block is adapted to abut against the bracket and remain locked; when the connecting block moves upward and engages with the convex tooth, the connecting block is adapted to rotate under the action of compressive force and be in a free state.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] (1) The present invention achieves the limiting and fixing of the entire manifold body by adjusting the position of the branch pipe end, that is, without clamping the outside of the manifold body by clamping, thereby effectively preventing the problem of missed detection caused by the obstruction of the clamp and improving the accuracy of detection; in addition, the fastening process of multiple clamping parts can be realized by the cooperation of a drive device and a transmission component, which reduces the manufacturing cost of the device and also reduces the complexity of the control system and improves the detection clamping efficiency.

[0017] (2) The present invention floats the detection base and, with the help of the vibration component, shakes the manifold body after it is immersed in water, thereby allowing the air bubbles remaining in the gaps to detach and float to the surface, thus further improving the accuracy of the detection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the existing automotive manifold structure.

[0019] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 3This is a schematic diagram of the internal structure of the detection device of the present invention.

[0021] Figure 4 This is a schematic diagram showing the state of the manifold body of the present invention when it is fixed on the base.

[0022] Figure 5 This is a schematic diagram of the manifold body of the present invention when it is not fixed to the base.

[0023] Figure 6 This is a schematic diagram of the driving device and transmission assembly structure at the bottom of the base of the present invention.

[0024] Figure 7 This is a schematic diagram of the first embodiment of the transmission component and the guide structure of the present invention.

[0025] Figure 8 This is a schematic diagram of the initial state of the clamping component of the present invention.

[0026] Figure 9 This is a schematic diagram illustrating the principle of the clamping component rotating according to the present invention.

[0027] Figure 10 This is a schematic diagram illustrating the principle of the clamping member of the present invention when it moves downward to hold and fix the device.

[0028] Figure 11 This is a schematic diagram of the second embodiment of the transmission component and the guide structure of the present invention.

[0029] Figure 12 This is a schematic diagram showing the overall installation of the mounting frame, bracket, and base of the present invention.

[0030] Figure 13 For the present invention Figure 12 A schematic diagram of a local structure.

[0031] Figure 14 This is a schematic diagram of the specific installation structure of the connecting block of the present invention.

[0032] Figure 15 This is a schematic diagram illustrating the principle of the connecting block moving downwards and engaging with the convex teeth according to the present invention.

[0033] In the diagram: 1. Manifold body; 101. Branch pipe end; 1011. Pipe opening; 1012. Flange; 102. Main pipe end; 2. Water tank; 3. Mounting bracket; 4. Support; 5. Base; 6. Inflation assembly; 601. Telescopic component; 602. Inflation head; 7. Clamping component; 701. Pressure plate; 702. Shaft; 8. Transmission assembly; 801. Transmission rod; 802. Mounting ring; 9. Positioning assembly; 901. Positioning block; 902. Positioning post; 10. Drive device; 11. Guide structure; 1101. Guide groove; 11011. Vertical section; 11012. Spiral section; 1102. Guide block; 12. Lifting device; 13. Vibration assembly; 1301. Fixing block; 1302. Connecting block; 14. Sliding block; 15. Convex tooth; 16. Sphere. Detailed Implementation

[0034] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0035] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0036] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0037] One preferred embodiment of this application, such as Figures 1 to 15 As shown, an exhaust manifold airtightness testing device for automobiles includes a base 5, multiple positioning components 9, multiple clamping components 7, a drive device 10, and a transmission component 8. The positioning components 9 are installed at the top of the base 5, the drive device 10 is installed at the bottom of the base 5, the clamping components 7 are movably disposed at the top of the base 5, and the transmission component 8 is disposed at the bottom of the base 5 with its input end connected to the output end of the drive device 10. The output end of the transmission component 8 is engaged with the clamping components 7.

[0038] Understandably, when fixing the manifold body 1, the branch end 101 of the manifold body 1 is first vertically inserted into the positioning component 9. The two are sealed together; that is, the positioning component 9 can block the branch end 101 and also limit the horizontal movement of the manifold body 1. Then, the drive device 10 is activated. The drive device 10 acts on the clamping member 7 through the transmission component 8 to perform two processes. The first process is as follows: Figure 9 As shown, the clamping member 7 will first rotate towards the branch pipe end 101 and align with it. Second process: as... Figure 10 As shown, the clamping member 7 moves vertically downward until it abuts against the top of the branch pipe end 101, thereby limiting the vertical position of the manifold body 1. By limiting the horizontal and vertical positions of the manifold body 1, the entire manifold body 1 can be locked and installed.

[0039] Therefore, this application effectively prevents missed detections caused by clamping by limiting and fixing the end position of the manifold body 1 (i.e., the branch pipe end 101), thus avoiding clamping the outer side of the manifold body 1 with a clamp, thereby improving the accuracy of the detection. Furthermore, the fastening process of multiple clamping parts 7 can be achieved through the cooperation of a single drive device 10 and transmission assembly 8, reducing the manufacturing cost of the device, simplifying the control system, and improving the detection clamping efficiency.

[0040] As a further description of the above embodiments: such as Figure 5 As shown, the clamping member 7 includes a shaft 702 and a pressure plate 701 disposed at the top of the shaft 702. The shaft 702 is movably inserted into the base 5, meaning that the shaft 702 can move vertically in the axial direction and also rotate axially. This application does not specifically limit the structure of the transmission assembly 8; two embodiments are provided below for reference:

[0041] Transmission component 8, first embodiment: as follows Figure 6 As shown, the transmission assembly 8 includes a transmission rod 801 and a mounting ring 802. The bottom end of the transmission rod 801 is connected to the output end of the drive device 10. The upper end of the transmission rod 801 is engaged with the shaft body 702 through a guide structure 11. The mounting ring 802 is vertically slidably set at the bottom end of the base 5 by a spring, and the mounting ring 802 is rotatably sleeved at the bottom end of the shaft body 702.

[0042] Understandably, during the first fixing process described above, the transmission rod 801 moves downward under the action of the drive device 10, and the transmission rod 801, under the action of the guide structure, drives the shaft 702 to rotate, so that the pressure plate 701 rotates to correspond with the top of the branch pipe end 101. At this time, the mounting ring 802 remains stationary in the vertical direction under the action of elasticity. In the second process, the transmission rod 801 continues to move downward, and the transmission rod 801 has rotated to its limit position in the circumferential direction. Therefore, the transmission rod 801 will drive the shaft 702 and the mounting ring 802 to move downward synchronously, so that the pressure plate 701 abuts against the top of the branch pipe end 101 for limiting.

[0043] like Figure 7 As shown, the guide structure 11 includes a guide block 1102 and a guide groove 1101. The guide block 1102 is disposed outside the transmission rod 801, and the guide groove 1101 is spiral-shaped and disposed inside the shaft 702. It can be understood that when the transmission rod 801 moves downward, the axial rotation of the shaft 702 is achieved through the sliding engagement of the guide block 1102 and the guide groove 1101.

[0044] Second embodiment of transmission assembly 8: Transmission assembly 8 includes transmission rod 801. The bottom end of transmission rod 801 is connected to the output end of drive device 10. The top end of transmission rod 801 is rotatably connected to the bottom end of shaft 702. Shaft 702 and base 5 are engaged by guide structure 11.

[0045] Understandably, during the first fixing process described above: the transmission rod 801 moves downward under the action of the drive device 10, and then the transmission rod 801 drives the shaft 702 to move downward synchronously. At this time, the shaft 702 rotates under the action of the guide structure 11, so that the pressure plate 701 rotates to correspond with the top of the branch pipe end 101. In the second process: the transmission rod 801 continues to drive the shaft 702 downward, and the pressure plate 701 abuts against the top of the branch pipe end 101 for limitation, while the shaft 702 remains stationary under the action of the guide structure 11.

[0046] like Figure 11 As shown, the guide structure 11 includes a guide block 1102 and a guide groove 1101. The guide block 1102 is disposed in the base 5. The guide groove 1101 includes a vertical section 11011 and a spiral section 11012 that are distributed vertically and connected to each other.

[0047] Understandably, during the first process, the guide block 1102 engages with the spiral section 11012, meaning that the shaft 702 moves downwards while simultaneously rotating, allowing the pressure plate 701 to rotate to the appropriate position. During the second process, the guide block 1102 engages with the vertical section 11011, causing the shaft 702 to move vertically downwards, allowing the pressure plate 701 to press and fix the branch pipe end 101.

[0048] It should be noted that when the transmission assembly 8 adopts the first embodiment described above, the shaft 702 first rotates axially and then moves downward to fix the branch pipe end 101; while when the transmission assembly 8 adopts the second embodiment described above, the shaft 702 initially rotates and moves downward simultaneously, and then continues to move downward to fix the branch pipe end 101. That is to say, initially, the height of the shaft 702 protruding from the base 5 in the first embodiment is less than that in the second embodiment, because in the second embodiment, the shaft 702 rotates and moves downward simultaneously in the first process, so there must be sufficient clearance space, otherwise the pressure plate 701 may interfere with the branch pipe end 101 or the positioning assembly 9 when rotating; therefore, when using the second embodiment, the clamping member 7 on the base 5 will appear more abrupt, which is not conducive to the compactness and aesthetics of the base 5; of course, when using the second embodiment, its structure is simple and the manufacturing cost is low. Both embodiments can meet the actual needs, and those skilled in the art can choose according to the actual situation.

[0049] In this embodiment, as Figure 1 As shown, the branch end 101 of the manifold body 1 has a pipe opening 1011 and a flange portion 1012, and the flange portion 1012 also has a pair of mounting holes; the positioning assembly 9 includes a positioning block 901 and a positioning pin 902. It can be understood that when the manifold body 1 is inserted and limited, the pipe opening 1011 is inserted into the positioning block 901, and the positioning pin 902 is inserted into the mounting hole. In addition, the pressure plate 701 also has a positioning hole that cooperates with the positioning pin 902. That is, after the pressure plate 701 is pressed against the flange portion 1012, the pressure plate 701 and the positioning pin 902 are also engaged. In this way, after the pressure plate 701 is pressed and fixed, it can also be limited in the horizontal direction under the action of the positioning pin 902, further improving the stability during the limiting.

[0050] In one embodiment of this application, such as Figure 3 and Figure 12As shown, the automotive exhaust manifold airtightness testing device also includes a water tank 2, a lifting device 12, and an inflation assembly 6. The lifting device 12 is mounted above the water tank 2 via a mounting bracket 3, and the base 5 is floatingly connected to the mounting bracket 3 via a support 4. The support 4 is connected to the output end of the lifting device 12, and the support 4 and the mounting bracket 3 cooperate via a vibration assembly 13. Figure 4 and Figure 5 As shown, the inflation assembly 6 includes a telescopic member 601 and an inflation head 602. After the branch pipe end 101 of the manifold body 1 is fixed, the telescopic member 601 drives the inflation head 602 to move and insert it into the main pipe end 102 of the manifold body 1. Then, gas is injected from the inflation head 602 into the manifold body 1 through an external pumping device for subsequent airtightness testing.

[0051] It should be noted that a floating connection refers to a connection method that allows for relative displacement or angular deflection of the connecting components in a specific direction; that is, the mounting bracket 3 and the support 4 are not completely "locked" together, but rather provided with a certain degree of "freedom." Specifically: such as... Figure 13 As shown, four sliding blocks 14 arranged in a rectangular shape are horizontally slidable at the top of the mounting frame 3 via springs. The bracket 4 passes through the sliding blocks 14 and is connected to the sliding blocks 14 via splines. In other words, the bracket 4 can move vertically along the mounting frame 3 and can also move horizontally by means of the sliding blocks 14. Of course, the bracket 4 and the output end of the lifting device 12 are also connected by a sliding connection.

[0052] Understandably, during the airtightness test, the lifting device 12 will move the base 5 down into the water tank 2 via the bracket 4. Then, the manifold body 1 can shake or vibrate under the action of the vibration component 13. The purpose is to remove the air bubbles that remain in the gaps when the clamping part 7, the manifold body 1, and the base 5 are submerged in water and float to the surface, so as to prevent these air bubbles from affecting the observation results in subsequent tests.

[0053] As a further description of the above embodiments: such as Figure 13 As shown, the vibration assembly 13 includes a fixing block 1301 and a connecting block 1302. The fixing block 1301 is mounted on the top of the mounting bracket 3 and has a plurality of spaced protrusions 15 on its side near the bracket 4. The connecting block 1302 is mounted on the bracket 4.

[0054] Understandably, when the bracket 4 moves down to a certain position under the action of the lifting device 12, the connecting block 1302 will move down accordingly until it is pressed and engaged with the protruding tooth 15. Under the action of the pressing force, the sliding block 14 will move slightly away from the protruding tooth 15. When the connecting block 1302 enters the gap between the two protruding teeth 15, the sliding block 14 will move and reset under the action of the elastic force. By repeating the above process, the entire base 5 can reciprocate slightly in the horizontal direction, thereby effectively removing the air bubbles left in the gap when the component is submerged in water.

[0055] It should be noted that the engagement of the aforementioned fixing block 1301 and connecting block 1302 can be scheduled after the manifold body 1 is submerged in water. That is, the vibration occurs after the manifold body 1 is submerged, as vibration is unnecessary before submersion. Furthermore, submersion provides buoyancy to components such as the base 5, thus reducing the vertical force on the entire device during vibration and ensuring its lifespan. Additionally, the vibration frequency and amplitude can be adjusted according to actual needs, such as by adjusting the spacing and shape of the protruding teeth 15 on the fixing block 1301, or by controlling the downward movement speed of the lifting device 12.

[0056] Further optimization, such as Figure 13 and Figure 14 As shown, a ball 16 is rotatably provided at the end of the connecting block 1302, which changes the original sliding fit between the connecting block 1302 and the tooth 15 to a rolling fit. This can greatly reduce the friction between the connecting block 1302 and the tooth 15, making the vibration process smoother, while also reducing the wear of components and improving the service life of the device.

[0057] It should be noted that after the airtightness test of the manifold body 1 is completed, the base 5 needs to be raised to the surface of the water by the lifting device 12. At this time, the connecting block 1302 will still interact with the tooth 15 and generate vibration during the upward return process. This vibration is completely unnecessary and will affect the service life of the support 4 and the base 5.

[0058] Therefore, in order to solve the above-mentioned technical problems, in one embodiment of this application, such as Figure 14 As shown, the connecting block 1302 can be elastically rotated and mounted on the bracket 4 via a torsion spring. It is understood that, as... Figure 15As shown, under normal conditions, the connecting block 1302 is horizontal under the action of elasticity, with its top end abutting against the bracket 4. When the connecting block 1302 moves downward and engages with the protruding tooth 15, it is subjected to an upward force. Since the top end of the connecting block 1302 is limited, it is in a locked state, meaning it vibrates through its engagement with the protruding tooth 15. When the connecting block 1302 moves upward and engages with the protruding tooth 15, it is subjected to a downward force. Since the bottom end of the connecting block 1302 is not limited, it rotates downward under the pressure, meaning it is in a free state. Therefore, when it moves upward, it cannot be rigidly pressed against the protruding tooth 15, thus preventing vibration. This effectively avoids unnecessary vibration affecting the device structure during the upward movement of the base 5, extending the device's service life. Meanwhile, this flexible rotating installation method has a simple structure and low manufacturing cost.

[0059] Finally, it should be noted that the specific structure and working principle of the lifting device 12, telescopic component 601, and driving device 10 mentioned above are well-known technologies to those skilled in the art, and therefore will not be described in detail here; common types include hydraulic cylinders, pneumatic cylinders, and linear motors, etc., and those skilled in the art can choose according to actual needs.

[0060] The working principle of this invention is as follows:

[0061] ①For example Figure 5 and Figure 8 As shown, before the manifold body 1 is placed for testing, the pressure plate 701 on the base 5 is offset from the positioning component 9, and at this time, the pressure plate 701 is parallel to the wide side of the base 5. ② Subsequently, the branch end 101 of the manifold body 1 is placed downwards and the corresponding positioning post 902 and positioning block 901 are inserted, thereby pre-positioning the manifold body 1 in the horizontal direction. ③ As shown... Figure 9 As shown, we will describe the transmission assembly 8 using the first embodiment. When the drive device 10 is activated, all the transmission rods 801 move downwards. The guide blocks 1102 on the transmission rods 801 act on the guide grooves 1101 within the shaft 702, thereby causing the shaft 702 to rotate 90 degrees. Figure 9As shown, the pressure plate 701 will rotate to be directly above the positioning post 902, and the pressure plate 701 is parallel to the long side of the base 5; during this process, the shaft 702 and the mounting ring 802 remain stationary in the vertical direction under the action of elastic force. ④ The drive device 10 continues to drive the transmission rod 801 to move downward, and at this time the guide block 1102 and the guide groove 1101 have been engaged to the limit position, so the transmission rod 801 will drive the shaft 702 and the mounting ring 802 to move downward synchronously, so that the pressure plate 701 abuts against the top of the branch pipe end 101, and of course the positioning post 902 is also inserted into the pressure plate 701; and a sealing gasket can also be provided on the base 5, thus realizing the clamping, fixing and sealing of the branch pipe end 101 of the manifold body 1. ⑤ As Figure 4 As shown, the telescopic component 601 moves the inflation head 602 and inserts it into the main pipe end 102 of the manifold body 1, thereby sealing the main pipe end 102. Then, gas is pumped from the inflation head 602 into the manifold body 1 through an external pump, so that the inside of the manifold is under high pressure. ⑥ The lifting device 12 moves the base 5 down into the water tank 2 through the bracket 4. When the manifold body 1 is completely immersed in the water, the lifting device 12 will continue to move the base 5 down a certain distance. During this process, the connecting block 1302 will squeeze and cooperate with the multiple protrusions 15 on the side of the fixing block 1301, so that the base 5 vibrates or shakes in the horizontal direction, thereby effectively removing the air bubbles left in the gaps when the components are submerged in water. Finally, the staff can judge the airtightness of the manifold body 1 by whether there are air bubbles in the water.

[0062] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A device for testing the airtightness of an automotive exhaust manifold, characterized in that, include: Base; Multiple positioning components are installed on the top of the base and are inserted into the branch end of the manifold body to limit the horizontal position of the manifold body. A driving device is mounted on the bottom end of the base; Multiple clamping elements are provided at the top of the base; as well as A transmission assembly is disposed at the bottom end of the base and its input end is connected to the output end of the drive device. The output end of the transmission assembly is connected to the clamping member. During fixing, the drive device is adapted to drive the clamping member through the transmission assembly to perform two processes, wherein in the first process, the clamping member is adapted to rotate toward and correspond to the branch pipe end; in the second process, the clamping member is adapted to move downward until it abuts against the branch pipe end, thereby limiting the manifold body in the vertical direction. The automotive exhaust manifold airtightness testing device also includes a water tank, a lifting device, and an inflation assembly. The lifting device is mounted above the water tank via a mounting bracket. The base is floatingly connected to the mounting bracket via a support. The support is connected to the output end of the lifting device. The support and the mounting bracket cooperate with each other via a vibration assembly. During testing, the base is first adapted to be lowered into the water tank via the lifting device, and then the manifold body is adapted to vibrate under the action of the vibration assembly. The vibration assembly includes a fixing block and a connecting block. The fixing block is installed on the top of the mounting frame and has a plurality of spaced protrusions on its side near the bracket. The connecting block is installed on the bracket. The connecting block moves down and presses against the protrusions to achieve vibration of the manifold body. The connecting block is elastically rotatably mounted on the bracket; when the connecting block moves downward and engages with the convex tooth, the connecting block is adapted to abut against the bracket and remain locked; when the connecting block moves upward and engages with the convex tooth, the connecting block is adapted to rotate under the action of compressive force and be in a free state.

2. The automotive exhaust manifold airtightness testing device as described in claim 1, characterized in that: The clamping component includes a shaft and a pressure plate disposed at the top of the shaft, the shaft being movably inserted into the base; the transmission assembly includes a transmission rod and a mounting ring, the bottom end of the transmission rod being connected to the output end of the drive device, the upper end of the transmission rod being engaged with the shaft body through a guide structure, and the mounting ring being vertically and elastically mounted on the bottom end of the base and rotatably sleeved on the bottom end of the shaft. During the first process: the transmission rod moves downward and drives the shaft to rotate through the guide structure. At this time, the mounting ring is adapted to remain stationary in the vertical direction under the action of elastic force. During the second process: the transmission rod is adapted to drive the shaft and the mounting ring to move downward synchronously, so that the pressure plate abuts against the end of the branch pipe.

3. The automotive exhaust manifold airtightness testing device as described in claim 2, characterized in that: The guiding structure includes a guide block and a spiral guide groove. The guide block is disposed outside the transmission rod, and the guide groove is disposed inside the shaft. The transmission rod is adapted to achieve rotation of the shaft through the sliding engagement of the guide block and the guide groove.

4. The automotive exhaust manifold airtightness testing device as described in claim 1, characterized in that: The clamping component includes a shaft and a pressure plate disposed at the top of the shaft. The shaft is movably inserted into the base and cooperates with the base through a guide structure. The transmission assembly includes a transmission rod. The bottom end of the transmission rod is connected to the output end of the drive device, and the top end of the transmission rod is rotatably connected to the bottom end of the shaft. During the first process, the transmission rod moves downward and drives the shaft to rotate through the guide structure, at which time the shaft and the transmission rod move downward synchronously; During the second process: the shaft continues to move downward until the pressure plate abuts against the end of the branch pipe, at which point the shaft is adapted to remain stationary in the circumferential direction.

5. The automotive exhaust manifold airtightness testing device as described in claim 4, characterized in that: The guiding structure includes a guide block and a guide groove. The guide block is disposed within the base. The guide groove includes a vertical section and a spiral section that are arranged vertically and connected to each other. When the guide block is engaged with the spiral section, the shaft is adapted to rotate and move axially. When the guide block is engaged with the vertical section, the shaft is adapted to move axially.

6. The automotive exhaust manifold airtightness testing device as described in any one of claims 1-5, characterized in that: The branch pipe end includes a pipe opening and a flange portion, and the positioning assembly includes a positioning block and a positioning post; when limiting the position, the positioning block cooperates with the pipe opening, the positioning post cooperates with the mounting hole of the flange portion, and the clamping member engages with the positioning post.

7. The automotive exhaust manifold airtightness testing device as described in claim 1, characterized in that: The end of the connecting block is rotatably provided with a ball, thereby enabling the connecting block to form a rolling engagement with the tooth.

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