Engine cylinder head air tightness detection device

Abstract

The present invention provides an engine cylinder head air tightness detection device, which relates to the technical field of airtightness testing, and includes a detection groove, a blocking mechanism, a positioning assembly and an independent plugging member, wherein a bottom plate is provided at the bottom of the detection groove, a column is installed at one end of the bottom plate surface, a top plate is installed on the top of the column, the positioning assembly is installed on the top plate, a plurality of independent plugging members are installed at the bottom of the positioning assembly, a cylinder is installed on the surface of the bottom plate, and one end of the cylinder is connected to the inside of the detection groove through a pipeline. The air tightness detection device seals the holes on the surface of the engine cylinder head to be tested by using a plurality of independent plugging elements, and can determine the specific location of the hole that has caused the leakage during the detection process, so that the acquisition of air tightness information is more comprehensive, and can also synchronously detect the air tightness at the bottom edge of the engine cylinder head, and improve the detection accuracy and efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of sealing test, in particular to an engine cylinder head airtightness detection device. Background Art

[0002] The automobile engine is the heart of the car, and its air tightness directly affects the engine's power output and fuel efficiency. During the production process of the engine, the air tightness detection device can be used to detect the air tightness of key components such as the engine cylinder head to discover and repair possible manufacturing defects. During the maintenance of the engine, the air tightness detection device can prevent and diagnose possible faults.

[0003] In the prior art, the air tightness detection device used in the engine cylinder head often adopts the pressure drop test method, which is to first seal the periphery of the engine cylinder head, inject high-pressure air into the inside, and then detect whether the internal air pressure has leaked after standing for a period of time to judge the air tightness. However, due to the complex structure of the engine cylinder head and the presence of a large number of hole structures on the surface, the conventional air tightness detection device can only judge the overall air tightness effect of the engine cylinder head, but cannot judge the specific location of the hole where the leak occurred. On the other hand, the conventional air tightness detection device will also inject clean water after the edge of the engine cylinder head is sealed, and judge its air tightness by observing the form of bubbles, but this solution can still only detect the edge of the engine cylinder head on the plane, and cannot judge whether the holes on the irregular surface of the engine cylinder head have leaked, especially for extremely fine leak points, where bubble observation is difficult. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an engine cylinder head air tightness detection device to solve the problems raised in the above-mentioned background technology. The present invention uses multiple independent sealing elements to seal the holes on the surface of the engine cylinder head to be tested, and can determine the specific location of the holes where the leakage occurs during the detection process, so that the acquisition of air tightness information is more comprehensive. At the same time, it can also perform synchronous detection of the air tightness at the bottom edge of the engine cylinder head, thereby improving the detection accuracy and efficiency.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: an engine cylinder head air tightness detection device, including a detection device body, the detection device body including a detection groove, a blocking mechanism, a positioning assembly and an independent sealing piece, a bottom plate is arranged at the bottom of the detection groove, a column is installed at one end of the bottom plate surface, a top plate is installed on the top of the column, the positioning assembly is installed on the top plate, a plurality of independent sealing pieces are installed on the bottom of the positioning assembly, a cylinder is installed on the surface of the bottom plate, one end of the cylinder is connected to the inside of the detection groove through a pipeline, a surrounding plate is arranged on the side of the detection groove, a blocking mechanism is installed on the surface of the surrounding plate, an inflation port is installed in the middle of the detection groove, a detection platform is arranged on the inner bottom plate of the detection groove, the bottom of the blocking mechanism is pressed on the surface of the detection platform, and the front end of the blocking mechanism is pressed against the edge of the engine cylinder head to be tested.

[0006] Furthermore, a drainage groove is arranged between the side of the testing platform and the testing groove, a docking plate is arranged on the surface of the testing platform, a water inlet is opened in the middle of the testing platform, the inflation port is installed in the middle position of the water inlet, and a pressure detection module is arranged on the side of the inflation port.

[0007] Furthermore, a drainage pipe and a water injection pipe are connected to the side of the detection tank, and the drainage pipe is connected to the interior of the drainage tank. The water injection pipe is connected to the interior of the water inlet from the bottom of the detection table, and the cylinder is connected to the inflation port through a pipe.

[0008] Furthermore, the blocking mechanism includes a partition, a bottom sealing plate and a front sealing plate, a threaded hole is opened at the bottom of the partition, a slider is connected to the rear end of the partition, a clamping plate is connected to the rear end of the slider, and a push rod is inserted into the threaded hole.

[0009] Furthermore, the bottom sealing plate and the front sealing plate are perpendicular to each other, and rubber pads are attached to the surfaces of the bottom sealing plate and the front sealing plate. A spring rod is embedded in the surface of the bottom sealing plate, and a pressure plate is connected to the top of the spring rod.

[0010] Furthermore, the top of the pressure plate is against the bottom of the partition, the sliding block passes through the inside of the slide groove, the clamping plate is against the outside of the enclosure, the end of the push rod is movably connected to the back of the front sealing plate through a bearing, and a plurality of the blocking mechanisms are provided.

[0011] Furthermore, the positioning assembly includes a guide chamber and an independent sealing member, the guide chamber is installed on the surface of the top plate, a plurality of telescopic columns are arranged at the front end of the guide chamber, and a plurality of air supply pipes are connected to the bottom of the guide chamber.

[0012] Furthermore, a lower hanging plate is connected to the bottom of the top plate, and the air supply pipes pass through the surface of the lower hanging plate in sequence, and each air supply pipe is connected to the rear end of one of the telescopic columns inside the guide chamber.

[0013] Furthermore, the independent sealing member includes a sealing plug and an outer sleeve, a threaded column is arranged on the top of the sealing plug, a threaded ring is sleeved on the outer side of the threaded column, and the outer side of the threaded ring is connected to the outer sleeve.

[0014] Furthermore, a sealing ring is connected to the bottom of the outer sleeve, an air inlet hole is opened on the surface of the air supply pipe at the bottom of the threaded column, the interior of the sealing plug is a solid structure, the air inlet hole is connected to the interior of the guide chamber through the air supply pipe, and a gap is set between the inner wall of the outer sleeve and the surface of the sealing plug.

[0015] Beneficial effects of the present invention:

[0016] 1. The engine cylinder head air tightness detection device uses a plurality of independent plugging elements to seal the holes on the surface of the engine cylinder head to be tested, and can determine the specific location of the hole where the leak occurs through the top guide chamber during the detection process, so that the acquisition of air tightness information is more comprehensive and accurate.

[0017] 2. The engine cylinder head air tightness detection device can directly inject clean water into the inside after the engine cylinder head is fixed and installed, and synchronously detect the air tightness at the bottom edge of the engine cylinder head by observing the penetration state of the clean water. The high pressure filled in from the inside improves the leakage efficiency, thereby improving the detection efficiency. At the same time, it can also determine the leakage area at the edge of the engine cylinder head.

[0018] 3. After detecting leakage at the bottom edge of the engine cylinder head, the engine cylinder head air tightness detection device can cooperate with the blocking mechanism to seal the specific leakage location, and detect the internal air pressure change again after sealing until the gas no longer leaks. Each detected leakage point can be confirmed, thereby realizing an additional verification function, making the air tightness status and the positioning of the leakage position sufficiently accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the appearance of an engine cylinder head air tightness detection device of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the detection tank part of the present invention;

[0021] Figure 3 for Figure 2 A magnified image of area A;

[0022] Figure 4 This is a disassembled diagram of the barrier mechanism of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the positioning component part of the present invention;

[0024] Figure 6 This is a disassembled diagram of the independent blocking member of the present invention;

[0025] In the figure: 1. bottom plate; 2. column; 3. top plate; 4. detection groove; 5. blocking mechanism; 6. positioning assembly; 7. enclosure; 8. slide; 9. detection table; 10. drainage groove; 11. docking plate; 12. cylinder; 13. drainage pipe; 14. water injection pipe; 15. water inlet; 16. inflation port; 17. pressure detection module; 18. partition; 19. slider; 20. card plate; 21. threaded hole; 22. ejector rod; 23. bottom sealing plate; 24. front sealing plate; 25. spring rod; 26. pressure plate; 27. guide chamber; 28. telescopic column; 29. ​​lower hanging plate; 30. air supply pipe; 31. independent sealing part; 32. sealing plug; 33. air inlet; 34. threaded column; 35. outer sleeve; 36. sealing ring; 37. threaded collar. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] See also Figures 1 to 6The present invention provides the following technical solutions: an engine cylinder head air tightness detection device, comprising a detection device body, the detection device body comprising a detection slot 4, a blocking mechanism 5, a positioning assembly 6 and an independent blocking piece 31, a bottom plate 1 is arranged at the bottom of the detection slot 4, a column 2 is installed at one end of the surface of the bottom plate 1, a top plate 3 is installed on the top of the column 2, the positioning assembly 6 is installed on the top plate 3, a plurality of independent blocking pieces 31 are installed at the bottom of the positioning assembly 6, a cylinder 12 is installed on the surface of the bottom plate 1, one end of the cylinder 12 is connected to the inside of the detection slot 4 through a pipeline, a side plate 7 is arranged at the side of the detection slot 4, a blocking mechanism 5 is installed on the surface of the blocking mechanism 7, an inflation port 16 is installed in the middle of the detection slot 4, a detection platform 9 is arranged on the inner bottom plate 1 of the detection slot 4, the bottom of the blocking mechanism 5 is pressed on the surface of the detection platform 9, and the front end of the blocking mechanism 5 is pressed against the edge of the engine cylinder head to be tested. The engine cylinder head air tightness detection device is used to detect whether there are leaks in the holes on the surface of the engine cylinder head and the connection area between the edge and the engine body. During installation, the engine cylinder head to be tested is directly placed inside the detection slot 4. The detection slot 4 matches the model and specifications of the engine cylinder head to be tested. Therefore, the engine cylinder head is directly pressed on the docking plate 11 of the test bench 9. The engine cylinder head and the preset holes on the docking plate 11 are aligned with screws and then locked. After locking, each independent sealing member 31 is used to fill and seal the surface holes of the engine cylinder head. Then, high-pressure gas can be injected into the interior of the engine cylinder head through the cylinder 12. After standing for a period of time, observe whether the internal air pressure drops. If no leakage occurs, the internal pressure drops. If the air pressure drops, it means that the air tightness is qualified. If the air pressure drops, clean water is injected into the inside of the engine cylinder head through the external water injection pipe 14, and whether there is water leakage on the test bench 9 outside the engine cylinder head, if there is no leakage, directly observe the top positioning component 6 to determine the specific location of the hole where the leakage occurs. If there is water leakage on the test bench 9, the leakage area is sealed by the blocking mechanism 5, and then the above process of determining the specific location of the hole where the leakage occurs is carried out until the air tightness status of the edge of the engine cylinder head and each hole is completed. If no leakage position is detected in all holes and the edge of the engine cylinder head, but there is still air pressure leakage, it can be confirmed that the leakage problem occurs at the connection of the assembly splicing mechanism of the engine cylinder head.

[0028] In this embodiment, a drainage groove 10 is provided between the side of the test platform 9 and the test slot 4, a docking plate 11 is provided on the surface of the test platform 9, a water inlet 15 is provided in the middle of the test platform 9, the air inlet 16 is installed in the middle of the water inlet 15, and a pressure detection module 17 is provided on the side of the air inlet 16, a drainage pipe 13 and a water injection pipe 14 are connected to the side of the test slot 4, and the drainage pipe 13 is connected to the inside of the drainage groove 10, the water injection pipe 14 is connected to the inside of the water inlet 15 from the bottom of the test platform 9, and the cylinder 12 is connected to the air inlet 16 through a pipe. After the engine cylinder head is fixedly installed, clean water can be directly injected into the inside, and the air tightness at the bottom edge of the engine cylinder head can be synchronously detected by observing the penetration state of clean water, and the high pressure charged inside improves the efficiency of leakage, thereby improving the efficiency of detection, and at the same time, the leakage area at the edge of the engine cylinder head can also be determined.

[0029] Specifically, after the fixing effect of the engine cylinder head to be tested is achieved through the docking plate 11 on the test bench 9, the high-pressure airflow can be directly injected into the inner side of the engine cylinder head through the middle inflation port 16, and the air pressure changes inside the engine cylinder head can be detected in real time through the side pressure detection module 17. At the same time, water can also be directly injected into the interior of the engine cylinder head from the water inlet 15 through the water injection pipe 14 along the middle channel of the test bench 9, and the injected clean water can be blocked by the edge of the engine cylinder head, so as to complete the subsequent air tightness status detection effect at the edge of the engine cylinder head with the help of the penetration changes and penetration position of the clean water, and the infiltrated water can be directly discharged from the drain groove 10.

[0030] In this embodiment, the blocking mechanism 5 includes a partition 18, a bottom sealing plate 23 and a front sealing plate 24. A threaded hole 21 is opened at the bottom of the partition 18, and a slider 19 is connected to the rear end of the partition 18. A card plate 20 is connected to the rear end of the slider 19. A push rod 22 is inserted into the threaded hole 21. The bottom sealing plate 23 and the front sealing plate 24 are perpendicular to each other, and rubber pads are attached to the surfaces of the bottom sealing plate 23 and the front sealing plate 24. A spring rod 25 is embedded on the surface of the bottom sealing plate 23. A pressure plate 26 is connected to the top of the spring rod 25. The top of the pressure plate 26 rests on the bottom of the partition 18. The slider 19 passes through the inside of the slide groove 8, and the card plate 20 rests on the outside of the enclosure 7. The end of the push rod 22 is movably connected to the back of the front sealing plate 24 through a bearing. The blocking mechanism 5 is provided with multiple ones. After detecting a leak at the bottom edge of the engine cylinder head, the barrier mechanism 5 can be used to seal the specific leaking location, and the internal air pressure change can be detected again after sealing until the gas no longer leaks. Each detected leak point can be confirmed, thereby realizing an additional verification function, so that the airtightness status and the positioning of the leak position are sufficiently accurate and reliable.

[0031] Specifically, when water stains appear on the test platform 9 outside the docking plate 11, it can be determined that a leak has occurred at the edge of the engine cylinder head to be tested. At this time, the blocking mechanism 5 can be moved to the position for sealing and blocking by observing the leak position. If the leakage is extremely small and the specific leak position cannot be accurately determined, the bottom sealing plate 23 in the blocking mechanism 5 can be pressed on the surface of the test platform 9 to block the water seeping out from both ends of the blocking mechanism 5. After standing for a long period of time, the range of the penetration area can be determined by observing which side of the blocking mechanism 5 the seeped water stains are concentrated on, and then the blocking mechanism 5 is moved to repeat the above-mentioned detection process until the specific leak position is determined. In the blocking mechanism 5, the front end sealing plate 24 can be pressed against the side of the engine cylinder head by rotating the rear end push rod 22, and the bottom sealing plate 23 can be pressed on the surface of the test platform 9 by the bottom spring rod 25, so as to achieve the purpose of sealing the edge of the engine cylinder head and dividing the test platform 9.

[0032] In this embodiment, the positioning assembly 6 includes a guide chamber 27 and an independent sealing member 31. The guide chamber 27 is installed on the surface of the top plate 3. A plurality of telescopic columns 28 are arranged at the front end of the guide chamber 27. A plurality of air supply pipes 30 are connected to the bottom of the guide chamber 27. A lower hanging plate 29 is connected to the bottom of the top plate 3. The air supply pipes 30 pass through the surface of the lower hanging plate 29 in turn, and each air supply pipe 30 is connected to the rear end of one of the telescopic columns 28 inside the guide chamber 27. The independent plugging component 31 includes a sealing plug 32 and an outer sleeve 35. A threaded column 34 is provided on the top of the sealing plug 32. A threaded collar 37 is sleeved on the outside of the threaded column 34. The outer side of the threaded collar 37 is connected to the outer sleeve 35. A sealing ring 36 is connected to the bottom of the outer sleeve 35. An air inlet 33 is provided on the surface of the air supply pipe 30 at the bottom of the threaded column 34. The interior of the sealing plug 32 is a solid structure. The air inlet 33 is connected to the interior of the guide chamber 27 through the air supply pipe 30. A gap is provided between the inner wall of the outer sleeve 35 and the surface of the sealing plug 32. By using multiple independent plugging components to seal the holes on the surface of the engine cylinder head to be tested, the specific location of the hole where the leak occurs can be determined through the guide chamber 27 at the top during the detection process, so that the acquisition of air tightness information is more comprehensive and accurate.

[0033] Specifically, the sealing plug 32 at the bottom is first embedded into the hole on the surface of the engine cylinder head, and then the threaded ring 37 is rotated and moved downward along the threaded column 34 until the sealing ring 36 at the bottom of the outer sleeve 35 is pressed against the side of the hole in the engine cylinder head, so that the hole can be enclosed. When the hole in the engine cylinder head leaks due to its own deformation and wear, it cannot be completely sealed by the sealing plug 32, which leads to air leakage. The leaked air will enter the air supply duct 30 from the air inlet 33, and finally enter the interior of the guide chamber 27, pushing out the telescopic column 28 corresponding to the independent sealing component 31, thereby judging that the hole has an airflow leakage problem.

[0034] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An engine cylinder head air tightness detection device, comprising a detection device body, characterized in that: The detection device body comprises a detection slot (4), a blocking mechanism (5), a positioning assembly (6) and an independent blocking member (31); a bottom plate (1) is arranged at the bottom of the detection slot (4); a column (2) is mounted at one end of the surface of the bottom plate (1); a top plate (3) is mounted on the top of the column (2); the positioning assembly (6) is mounted on the top plate (3); a plurality of independent blocking members (31) are mounted at the bottom of the positioning assembly (6); a cylinder (12) is mounted on the surface of the bottom plate (1); one end of the cylinder (12) is connected to the inside of the detection slot (4) via a pipeline; a side plate (7) is arranged at the side of the detection slot (4); a blocking mechanism (5) is mounted on the surface of the side plate (7); a central portion of the detection slot (4) is provided with a plurality of independent blocking members (31 ... cylinder (12); a blocking mechanism (5) is mounted on the surface of the blocking mechanism (5); a central portion of the detection slot (4) is provided with a plurality of independent blocking members (31); a cylinder (12) is mounted on the surface of the cylinder (12); a blocking mechanism (5) is mounted on the surface of the blocking mechanism (5); a central portion of the detection slot (4) is provided with a plurality of independent blocking members (31); a cylinder (12) is mounted on the surface of the cylinder (12); a blocking mechanism (5) is mounted on the surface of the blocking mechanism (5); a central portion of the detection slot (4) is provided with a plurality of independent blocking members (31); a cylinder (12) An air filling port (16) is installed, the inner bottom plate (1) of the detection groove (4) is provided with a detection platform (9), the bottom of the blocking mechanism (5) is pressed against the surface of the detection platform (9), and the front end of the blocking mechanism (5) is pressed against the edge of the cylinder head of the engine to be tested, a drainage groove (10) is provided between the side of the detection platform (9) and the detection groove (4), a docking plate (11) is provided on the surface of the detection platform (9), a water inlet (15) is opened in the middle of the detection platform (9), the air filling port (16) is installed in the middle position of the water inlet (15), and a pressure detection module (17) is provided on the side of the air filling port (16), and the blocking mechanism (5) comprises a partition plate (18), a bottom sealing plate (23) and a front sealing plate (24). The bottom of the partition (18) is provided with a threaded hole (21), the rear end of the partition (18) is connected to a slider (19), the rear end of the slider (19) is connected to a card plate (20), a top rod (22) is inserted into the threaded hole (21), the bottom sealing plate (23) and the front sealing plate (24) are perpendicular to each other, and the surfaces of the bottom sealing plate (23) and the front sealing plate (24) are both attached with rubber pads, the surface of the bottom sealing plate (23) is embedded with a spring rod (25), the top of the spring rod (25) is connected to a pressure plate (26), the top of the pressure plate (26) is against the bottom of the partition (18), the slider (19) passes through the inside of the slide groove (8), and the card plate (20) is against On the outer side of the enclosure (7), the end of the top rod (22) is movably connected to the back side of the front sealing plate (24) through a bearing, the blocking mechanism (5) is provided in plurality, the positioning assembly (6) comprises a guide chamber (27) and an independent blocking member (31), the guide chamber (27) is installed on the surface of the top plate (3), a plurality of telescopic columns (28) are provided at the front end of the guide chamber (27), a plurality of air supply pipes (30) are connected to the bottom of the guide chamber (27), a lower hanging plate (29) is connected to the bottom of the top plate (3), the air supply pipes (30) pass through the surface of the lower hanging plate (29) in sequence, and each air supply pipe (30) is connected to the rear end of one of the telescopic columns (28) inside the guide chamber (27),The independent sealing member (31) comprises a sealing plug (32) and an outer sleeve (35), a threaded column (34) is provided at the top of the sealing plug (32), a threaded collar (37) is sleeved on the outer side of the threaded column (34), the outer side of the threaded collar (37) is connected to the outer sleeve (35), the bottom of the outer sleeve (35) is connected to a sealing ring (36), an air inlet hole (33) is provided on the surface of the air supply pipe (30) at the bottom of the threaded column (34), the interior of the sealing plug (32) is a solid structure, the air inlet hole (33) is connected to the interior of the guide chamber (27) through the air supply pipe (30), and a gap is provided between the inner wall of the outer sleeve (35) and the surface of the sealing plug (32).

2. The engine cylinder head air tightness detection device according to claim 1, characterized in that: A drainage pipe (13) and a water injection pipe (14) are connected to the side of the detection tank (4), and the drainage pipe (13) is connected to the inside of the drainage tank (10). The water injection pipe (14) is connected to the inside of the water inlet (15) from the bottom of the detection platform (9), and the cylinder (12) is connected to the inflation port (16) through a pipe.

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