A cylinder head air tightness detection device

Abstract

The utility model provides a kind of cylinder head air tightness detection device, by setting up carousel, four stations of feeding, visual inspection, air tightness detection and discharging are set on carousel, can realize the full-process automation of cylinder head air tightness detection, improve the detection efficiency of cylinder head air tightness detection;Through the first air tightness detection component and the second air tightness detection component respectively butt joint inlet cavity and exhaust cavity, combined with the independent control of solenoid valve component, realize the separation type air tightness detection of inlet cavity and exhaust cavity, once found leakage, can accurately locate the position of leakage, without second investigation;By setting cylinder head bearing assembly, the cylinder head of multiple specifications can be fixed, improve the applicability of the detection device.

Description

Technical Field

[0001] This application relates to the field of engine housing assembly and testing equipment technology, and in particular to a cylinder head airtightness testing device. Background Technology

[0002] In existing technologies, the airtightness testing of gasoline engine cylinder heads mainly adopts a holistic testing method involving inflation from the bottom of the cylinder block, simultaneously testing the sealing of the intake and exhaust chambers. While this method is highly efficient, when the test results show that the airtightness fails to meet the standards, it can only determine that a leak exists, but cannot distinguish whether the leak originates from the intake chamber, exhaust chamber, or the connection between the two. This necessitates secondary manual inspection or segmented disassembly and testing, significantly increasing time and manpower costs, and potentially introducing new quality risks due to repeated disassembly and reassembly. Utility Model Content

[0003] To address the aforementioned technical problems, this application provides a cylinder head airtightness testing device, comprising a turntable, a frame, a cylinder head support assembly, a vision inspection assembly, an airtightness testing assembly, and a feeding mechanism. The frame is mounted on the turntable, which is divided into a loading station, a vision inspection station, an airtightness testing station, and a feeding station. The cylinder head support assembly is disposed at each station on the turntable for fixing the cylinder head to be tested. The vision inspection assembly, the airtightness testing assembly, and the feeding mechanism are all mounted on the frame. The airtightness testing assembly includes a first airtightness testing assembly and a second airtightness testing assembly disposed opposite to each other, and a solenoid valve assembly. When the cylinder head rotates between the first and second airtightness testing assemblies, the first airtightness testing assembly connects to the air inlet of the cylinder head's air inlet chamber, and the second airtightness testing assembly connects to the exhaust port of the cylinder head's exhaust chamber. The solenoid valve assembly controls the opening and closing of the air supply between the first and second airtightness testing assemblies, thereby achieving separate airtightness testing of the air inlet and exhaust chambers.

[0004] In some embodiments of this application, the first airtightness testing component includes a first cylinder, a connecting plate, a cylinder mounting base, a connector, and a cylinder plug; the cylinder mounting base is disposed on the frame, and the cylinder mounting base is provided with a positioning post and a connecting groove; the first cylinder is disposed on the connecting plate; the cylinder plug is disposed on the extended end of the first cylinder; the connecting plate is provided with a mounting hole adapted to the connecting groove; the connector passes through the mounting hole and is disposed in the connecting groove by rotational snap-fit, so as to realize the quick disassembly and assembly of the first cylinder and the cylinder mounting base.

[0005] In some embodiments of this application, a first detection switch is also provided on one side of the cylinder mounting base, the first detection switch being used to detect the presence or absence of the connecting plate.

[0006] In some embodiments of this application, a cylinder plug support is also included; the cylinder plug support is disposed on the frame and has a plurality of cylinder plug mounting holes on its upper part, and a second detection switch is disposed on one side of the cylinder plug mounting holes.

[0007] In some embodiments of this application, a clamping assembly is also included; the clamping assembly includes a clamping cylinder and a clamping block; the clamping cylinder is disposed on the frame, and the clamping block is disposed on the extended end of the clamping cylinder.

[0008] In some embodiments of this application, the cylinder head bearing assembly includes a first fixed plate, a second fixed plate, a support column, a movable plate, a first positioning pin, a second positioning pin, and a bearing plate assembly. The first fixed plate is disposed on the turntable, and multiple support columns are spaced apart on the first fixed plate. The second fixed plate is disposed on the support columns. The movable plate is disposed on the second fixed plate, and a limiting groove is formed on its side. The support column is accommodated in the limiting groove to limit the horizontal displacement of the movable plate. The bearing plate assembly is disposed on the movable plate and is fixedly connected to the support columns. The first positioning pin passes through a first mounting hole in the movable plate, and its end extends into the bearing plate assembly for locking the movable plate. The movable plate is provided with a second mounting hole and a third mounting hole that communicate with each other, and the diameter of the third mounting hole is larger than the size of the second mounting hole. The second positioning pin passes through the second fixed plate, the movable plate, and the bearing plate assembly sequentially from bottom to top. When the restriction of the first positioning pin is released, pulling the movable plate allows the second positioning pin to enter the third mounting hole from the second mounting hole, thereby disengaging the second positioning pin from the lower part of the second fixed plate for quick disassembly.

[0009] In some embodiments of this application, the top of the bearing plate assembly is provided with a cylinder head position marking line and a cylinder head model marking.

[0010] In some embodiments of this application, there are multiple sets of the second and third mounting holes, each set including two second mounting holes and two third mounting holes.

[0011] In some embodiments of this application, the limiting groove is an arc-shaped groove.

[0012] In some embodiments of this application, the unloading mechanism includes a three-axis truss and a gripper assembly disposed on the three-axis truss.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects: The cylinder head airtightness testing device of this application, by setting a turntable with four stations on the turntable for feeding, visual inspection, airtightness testing, and unloading, can realize the full automation of the cylinder head airtightness testing process and improve the testing efficiency; by connecting the first airtightness testing component and the second airtightness testing component to the intake chamber and exhaust chamber respectively, and combining the independent control of the solenoid valve component, separate airtightness testing of the intake chamber and exhaust chamber can be realized. Once a leak is detected, the location of the leak can be accurately located without secondary investigation; by setting a cylinder head bearing component, various specifications of cylinder heads can be fixed, improving the applicability of the testing device.

[0014] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this document. Attached Figure Description

[0015] The accompanying drawings, which form part of this document, are used to provide a further understanding of the document. The illustrative embodiments and descriptions herein are used to explain the document and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a cylinder head airtightness testing device provided in an exemplary embodiment of this application; Figure 2 This is a top view of a cylinder head airtightness testing device provided in an exemplary embodiment of this application; Figure 3 This is a front view of a cylinder head airtightness testing device provided in an exemplary embodiment of this application; Figure 4 This is a schematic diagram of the structure of an airtightness detection component provided in an exemplary embodiment of this application; Figure 5 This is a side view of an airtightness detection component provided in an exemplary embodiment of this application; Figure 6 This is the book Figure 5 Sectional view at point AA; Figure 7 This is a schematic diagram of the structure of a cylinder head bearing assembly provided in an exemplary embodiment of this application; Figure 8 This is a front view of a cylinder head support assembly provided in an exemplary embodiment of this application; Figure 9 yes Figure 8 Sectional view at point BB.

[0016] In the picture: 10. Turntable; 20. Frame; 30. Cylinder head bearing assembly; 40. Air tightness testing assembly; 50. Feeding mechanism; 60. Cylinder plug bearing seat; 70. Clamping assembly; 80. Cylinder head; 101. Loading station; 102. Visual inspection station; 103. Air tightness inspection station; 104. Unloading station; 301. First fixed plate; 302. Support column; 303. Second fixed plate; 304. Movable plate; 3041. Limiting groove; 3042. Second mounting hole; 3043. Third mounting hole; 305. Bearing plate assembly; 306. First positioning pin; 307. Second positioning pin; 308. Cylinder head position marking line; 309. Cylinder head model marking; 401. First air tightness inspection component; 4011. First cylinder; 4012. Connecting plate; 4013. Cylinder mounting seat; 4013a. Positioning column; 4013b. Connecting groove; 4014. Connecting piece; 4015. Cylinder plug; 402. Second air tightness inspection component. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0018] In existing technologies, the airtightness testing of gasoline engine cylinder heads mainly adopts a holistic testing method involving inflation from the bottom of the cylinder block, simultaneously testing the sealing of the intake and exhaust chambers. While this method is highly efficient, when the test results show that the airtightness fails to meet the standards, it can only determine that a leak exists, but cannot distinguish whether the leak originates from the intake chamber, exhaust chamber, or the connection between the two. This necessitates secondary manual inspection or segmented disassembly and testing, significantly increasing time and manpower costs, and potentially introducing new quality risks due to repeated disassembly and reassembly.

[0019] Based on this, an exemplary embodiment of this application provides a cylinder head airtightness testing device. By setting up a turntable with four stations on it—loading, visual inspection, airtightness testing, and unloading—the device can automate the entire cylinder head airtightness testing process, improving testing efficiency. Through the connection of a first airtightness testing component and a second airtightness testing component to the intake and exhaust chambers respectively, combined with the independent control of the solenoid valve assembly, separate airtightness testing of the intake and exhaust chambers is achieved. Once a leak is detected, the leak location can be accurately pinpointed without secondary investigation. Furthermore, by setting up a cylinder head support component, various cylinder head specifications can be fixed, improving the applicability of the testing device.

[0020] An exemplary embodiment of this application provides a cylinder head airtightness testing device, such as... Figures 1 to 3 As shown, the cylinder head airtightness testing device includes a turntable 10, a frame 20, a cylinder head support assembly 30, a vision inspection assembly, an airtightness testing assembly 40, and a feeding mechanism 50. The frame 20 is mounted on the turntable 10. A protective plate is installed around the frame 20 to enclose the turntable 10. The turntable 10 is divided into a loading station 101, a vision inspection station 102, an airtightness testing station 103, and a feeding station 104. Two cylinder head support assemblies 30 are installed at each station, so that the airtightness of two cylinder heads 80 can be tested simultaneously, improving the testing efficiency. The operator or a robot arm fixes the cylinder head 80 to the cylinder head support assembly 30 from the loading station 101. The cylinder head bearing assembly 30 is set at each station of the turntable 10 to fix the cylinder head 80 to be tested. It can rotate with the turntable 10 so that the cylinder head 80 fed from the loading station 101 can be sequentially transferred to the vision inspection station 102, the air tightness inspection station 103 and the unloading station 104, realizing the full automation of the air tightness inspection of the cylinder head 80 and improving the inspection efficiency of the air tightness inspection of the cylinder head 80.

[0021] The visual inspection component, the airtightness inspection component 40, and the feeding mechanism 50 are all mounted on the frame 20. Preferably, the visual inspection component includes a camera, which is mounted on a bracket at the top of the frame 20 and can move on the bracket to adjust the angle and photograph whether the valve stems on both sides of the cylinder head 80 are installed in place.

[0022] The airtightness testing assembly 40 includes a first airtightness testing assembly 401 and a second airtightness testing assembly 402 disposed opposite to each other, and a solenoid valve assembly. For example, the first airtightness testing assembly 401 is fixed to a bracket outside the frame 20, the second airtightness testing assembly 402 is fixed to a bracket inside the frame 20, and the solenoid valve assembly is disposed on a bracket at the top of the frame 20. When the cylinder head 80 rotates between the first airtightness testing assembly 401 and the second airtightness testing assembly 402, the first airtightness testing assembly 401 aligns with the air inlet of the cylinder head 80's air intake chamber, and the second airtightness testing assembly 402 aligns with the exhaust port of the cylinder head 80's exhaust chamber. The solenoid valve assembly controls the opening and closing of the air supply between the first airtightness testing assembly 401 and the second airtightness testing assembly 402, achieving separate airtightness testing of the air intake chamber and the exhaust chamber.

[0023] Preferably, to prevent the cylinder head 80 from shifting position, the cylinder head airtightness testing device of this application further includes a clamping assembly 70; the clamping assembly 70 includes a clamping cylinder and a clamping block; the clamping cylinder is mounted on the frame 20, and the clamping block is mounted on the extended end of the clamping cylinder. The clamping cylinder can drive the clamping block to move vertically up and down. When the cylinder head 80 rotates between the first airtightness testing assembly 401 and the second airtightness testing assembly 402, the clamping assembly 70 first clamps the cylinder head 80, and then performs airtightness testing. The solenoid valve assembly can first control the first airtightness testing assembly 401 to ventilate in order to test the airtightness of the intake chamber. After completing the airtightness test of the intake chamber, the solenoid valve assembly controls the first airtightness testing assembly 401 to shut off the air supply and controls the second airtightness testing assembly 402 to ventilate in order to test the airtightness of the exhaust chamber. During the testing process, once a leak is detected, the location of the leak can be accurately located without the need for secondary investigation.

[0024] like Figures 4 to 6 As shown, the first airtightness testing component 401 includes a first cylinder 4011, a connecting plate 4012, a cylinder mounting base 4013, a connector 4014, and a cylinder plug 4015. The first cylinder 4011 can drive the cylinder plug 4015 to move towards the cylinder head inlet so as to insert into the inlet and seal it. To adapt to the positions of the inlet and outlet of cylinder heads 80 of different specifications, the second airtightness components 402 of the first airtightness testing component 401 in this invention all adopt a quick-release and quick-install fixing method. Specifically, the cylinder mounting base 4013 is set on the frame 20, and there can be multiple cylinder mounting bases 4013, each position of which is adapted to a cylinder head 80 of a certain specification. The cylinder mounting base 4013 is provided with a positioning post 4013a and a connecting groove 4013b; the first cylinder 4011 is fixedly mounted on the connecting plate 4012; the cylinder plug 4015 is provided on the extended end of the first cylinder 4011; the connecting plate 4012 is provided with a mounting hole that matches the connecting groove 4013b; the connector 4014 passes through the mounting hole and is mounted in the connecting groove 4013b by rotation and snap-fit, so as to realize the quick disassembly and assembly of the first cylinder 4011 and the cylinder mounting base 4013. The connector 4014 includes a main body, and the lower end of the main body is provided with a snap-fit ​​part symmetrically arranged along the circumference of the main body. The connecting groove 4013b and the mounting hole are both elongated. When the connector 4014 is installed into the connecting groove 4013b, the connector 4014 is rotated so that the snap-fit ​​part can be snapped into the cylinder mounting seat 4013, realizing the quick assembly of the first cylinder 4011 and the cylinder mounting seat 4013, and also realizing quick disassembly.

[0025] Preferably, a first detection switch is also provided on one side of the cylinder mounting base 4013. The first detection switch is used to detect the presence or absence of the connecting plate 4012 in order to prevent the first cylinder 4011 from being installed in the wrong position.

[0026] The structure of the second airtightness detection component 402 is similar to that of the first airtightness detection component 401, and will not be described in detail here.

[0027] Preferably, since the intake and exhaust ports of different models of cylinder heads 80 have different sizes, in order to adapt to various specifications of cylinder heads, the cylinder head airtightness testing device of this application also includes a cylinder plug support 60; the cylinder plug support 60 is set on the frame 20, and multiple cylinder plug mounting holes are provided on the upper part, and cylinder plugs 4015 of various specifications are set in the cylinder plug mounting holes; preferably, a second detection switch is provided on one side of the cylinder plug mounting hole, and the second detection switch is used to detect the presence or absence of the cylinder plug 4015, so as to prevent the cylinder plug 4015 from being installed incorrectly.

[0028] like Figures 7 to 9As shown, the cylinder head bearing assembly 30 includes a first fixed plate 301, a second fixed plate 303, a support column 302, a movable plate 304, a first positioning pin 306, a second positioning pin 307, and a bearing plate assembly 305. The first fixed plate 301 is disposed on the turntable 10, and multiple support columns 302 are spaced apart on the first fixed plate 301. The second fixed plate 303 is disposed on the support columns 302. The movable plate 304 is disposed on the second fixed plate 303, and a limiting groove 3041 is formed on its side. Preferably, the limiting groove 3041 is an arc-shaped groove to fit the shape of the support column 302. The support column 302 is housed within the limiting groove 3041 to limit the horizontal displacement of the movable plate 304; the bearing plate assembly 305 is disposed on the movable plate 304 and fixedly connected to the support column 302; the first positioning pin 306 passes through the lower part of the second fixing plate 303 into the first mounting hole of the movable plate 304, and its end can extend into the bearing plate assembly 305 for locking the movable plate 304; the movable plate 304 is provided with a second mounting hole 3042 and a third mounting hole 3043 that communicate with each other, and the third mounting hole 3043... The diameter of the first positioning pin 306 is larger than that of the second mounting hole 3042; the second positioning pin 307 passes through the second fixed plate 303, the movable plate 304, and the support plate assembly 305 from bottom to top; the upper diameter of the second positioning pin 307 is larger than the lower diameter, and the upper diameter is larger than the diameter of the second mounting hole 3042 to prevent the second positioning pin 307 from coming out of the second mounting hole 3042, and smaller than the diameter of the third mounting hole 3043 so that the second positioning pin 307 can come out of the third mounting hole 3043. When the restriction of the first positioning pin 306 is released, pulling the movable plate 304 allows the second positioning pin 307 to enter the third mounting hole 3043 from the second mounting hole 3042, thereby allowing the second positioning pin 307 to come out from the lower part of the second fixed plate 303, achieving quick disassembly. Similarly, the second positioning pin 307 can be quickly installed. During the process of pulling the movable plate 304, the limiting groove 3041 can restrict the movement displacement of the movable plate 304 and prevent the movable plate 304 from coming off.

[0029] There are multiple sets of second mounting holes 3042 and third mounting holes 3043. Each set includes two second mounting holes 3042 and three mounting holes 3043. Each specification of cylinder head 80 is fixed through a set of second mounting holes 3042 and three mounting holes 3043. When replacing cylinder head 80 of different specifications, the restriction on the first positioning pin 306 can be released, the movable plate 304 can be pulled, and the second positioning pin 307 can be quickly disassembled and installed in a suitable position.

[0030] Preferred, such as Figure 7 As shown, the top of the bearing plate assembly 305 is provided with a cylinder head position marking line 308 and a cylinder head model marking 309, which makes it easy to distinguish the fixing position of cylinder heads 80 of different specifications, and a second positioning pin 307 is installed in different positions to fix the cylinder head 80.

[0031] The unloading mechanism 50 includes a three-axis truss and a gripper assembly mounted on the three-axis truss. The three-axis truss can move in the X, Y, and Z directions, enabling the gripper assembly to clamp the cylinder head 80 and transfer it to a preset position. The gripper assembly includes a gripper cylinder and two opposing grippers located at the extended end of the gripper cylinder. The gripper cylinder can drive the two grippers to open and close, thereby clamping and releasing the cylinder head 80.

[0032] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0033] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0034] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, the intent of this application also includes these modifications and variations.

Claims

1. A cylinder head airtightness testing device, characterized in that, The system includes a turntable (10), a frame (20), a cylinder head support assembly (30), a vision inspection assembly, an airtightness inspection assembly (40), and a feeding mechanism (50). The frame (20) is mounted on the turntable (10). The turntable (10) is divided into a loading station (101), a vision inspection station (102), an airtightness inspection station (103), and a feeding station (104). The cylinder head support assembly (30) is located at each station of the turntable (10) and is used to fix the cylinder head (80) to be inspected. The vision inspection assembly, the airtightness inspection assembly (40), and the feeding mechanism (50) are all mounted on the frame (20). The component (40) includes a first airtightness detection component (401) and a second airtightness detection component (402) arranged opposite to each other, as well as a solenoid valve assembly; when the cylinder head (80) rotates between the first airtightness detection component (401) and the second airtightness detection component (402), the first airtightness detection component (401) is connected to the air inlet of the air inlet chamber of the cylinder head (80), and the second airtightness detection component (402) is connected to the exhaust port of the exhaust chamber of the cylinder head (80); the solenoid valve assembly controls the opening and closing of the first airtightness detection component (401) and the second airtightness detection component (402) to realize the separate airtightness detection of the air inlet chamber and the exhaust chamber.

2. The cylinder head airtightness testing device according to claim 1, characterized in that, The first airtightness testing component (401) includes a first cylinder (4011), a connecting plate (4012), a cylinder mounting base (4013), a connector (4014), and a cylinder plug (4015); the cylinder mounting base (4013) is disposed on the frame (20), and the cylinder mounting base (4013) is provided with a positioning post (4013a) and a connecting groove (4013b); the first cylinder (4011) is disposed on the connecting plate (4012), the connecting plate (4013), the connecting plate (4012), the connecting plate (4013), the connecting plate (4013), the connecting plate (4014), the connecting plate (4015), the connecting plate (4012 ... The cylinder plug (4015) is located on the extended end of the first cylinder (4011); the connecting plate (4012) is provided with a mounting hole that matches the connecting groove (4013b); the connecting piece (4014) passes through the mounting hole and is mounted in the connecting groove (4013b) by rotational snap-fit, so as to realize the quick disassembly and assembly of the first cylinder (4011) and the cylinder mounting seat (4013).

3. The cylinder head airtightness testing device according to claim 2, characterized in that, A first detection switch is also provided on one side of the cylinder mounting base (4013), which is used to detect the presence or absence of the connecting plate (4012).

4. The cylinder head airtightness testing device according to claim 2, characterized in that, It also includes a cylinder plug support (60); the cylinder plug support (60) is mounted on the frame (20) and has multiple cylinder plug mounting holes on its upper part, and a second detection switch is provided on one side of the cylinder plug mounting holes.

5. The cylinder head airtightness testing device according to claim 1, characterized in that, It also includes a clamping assembly (70); the clamping assembly (70) includes a clamping cylinder and a clamping block; the clamping cylinder is disposed on the frame (20), and the clamping block is disposed on the extended end of the clamping cylinder.

6. The cylinder head airtightness testing device according to claim 1, characterized in that, The cylinder head bearing assembly (30) includes a first fixed plate (301), a second fixed plate (303), a support column (302), a movable plate (304), a first positioning pin (306), a second positioning pin (307), and a bearing plate assembly (305); the first fixed plate (301) is disposed on the turntable (10), a plurality of support columns (302) are spaced apart on the first fixed plate (301), and the second fixed plate (303) is disposed on the support columns (302); the movable plate (304) is disposed on the second fixed plate (303), and a limiting groove (3041) is formed on its side; the support column (302) is accommodated in the limiting groove (3041) to limit the horizontal displacement of the movable plate (304); the bearing plate assembly (305) is disposed on the movable plate (304) and is fixedly connected to the support column (302); The first positioning pin (306) passes through the first mounting hole of the movable plate (304) and extends its end into the support plate assembly (305) to lock the movable plate (304). The movable plate (304) is provided with a second mounting hole (3042) and a third mounting hole (3043) that are interconnected, and the diameter of the third mounting hole (3043) is larger than that of the second mounting hole (3042). The second positioning pin (307) passes through the second fixed plate (303), the movable plate (304) and the support plate assembly (305) from bottom to top. When the restriction of the first positioning pin (306) is released, the movable plate (304) is pulled, so that the second positioning pin (307) can enter the third mounting hole (3043) from the second mounting hole (3042), and then the second positioning pin (307) can be dislodged from the lower part of the second fixed plate (303) to achieve quick disassembly.

7. The cylinder head airtightness testing device according to claim 6, characterized in that, The top of the bearing plate assembly (305) is provided with a cylinder head position marking line (308) and a cylinder head model marking (309).

8. The cylinder head airtightness testing device according to claim 6, characterized in that, There are multiple sets of the second mounting hole (3042) and the third mounting hole (3043), each set including two second mounting holes (3042) and two third mounting holes (3043).

9. The cylinder head airtightness testing device according to claim 6, characterized in that, The limiting groove (3041) is an arc-shaped groove.

10. The cylinder head airtightness testing device according to claim 1, characterized in that, The unloading mechanism (50) includes a three-axis truss and a gripper assembly disposed on the three-axis truss.

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