Cylinder head air tightness detection device

Abstract

The present invention discloses a cylinder head air tightness detection device, comprising: a frame; a detection table, which is arranged on the frame and used to place the cylinder head to be detected; a clamping mechanism, which is arranged on the frame and can contact the cylinder head and fix the cylinder head on the detection table; a detection mechanism, which is arranged on the frame and includes a sealing mechanism and an air charging mechanism, the sealing mechanism corresponds to the position of the channel opening of the air channel and / or oil channel and / or water channel on the cylinder head, and the sealing mechanism can move relative to the detection table and can approach the cylinder head and close the channel opening, the air charging mechanism is arranged on the sealing mechanism, the air charging mechanism is connected with the channel opening and can charge gas into the channel opening; a detection box, which is arranged on the frame, the detection box is configured with liquid, and can move relative to the detection table so that the cylinder head enters the detection box. The beneficial effect of the present invention is that the air tightness of the water channel, air channel and oil channel inside the cylinder head can be detected, the detection efficiency is high, and the detection is convenient and simple.

Description

Technical Field

[0001] The invention relates to a sealing detection device, in particular to an airtightness detection device for a cylinder head. Background Art

[0002] The engine cylinder head, cylinder liner and piston together form the combustion chamber of the diesel engine. The cylinder head is one of the parts of the diesel engine that withstands high temperature and high pressure working conditions. The cylinder head is made of cast iron or aluminum alloy. It is the mounting base of the valve mechanism and the sealing cover of the cylinder. The engine cylinder head is the most complex component of all diesel engine parts and bears the largest mechanical and thermal loads. The bolt preload on the top surface of the cylinder head is much greater than the combustion pressure, and the bottom surface of the cylinder head bears the high-pressure gas pressure and thermal load generated by the combustion of the fuel. When the diesel engine is working, the mechanical and thermal stress states of the cylinder head are very complex. The inner cavity of the cylinder head is arranged with intake ducts, exhaust ducts, intake valves, exhaust valves and injectors. The cylinder head base plate, intake and exhaust valves, exhaust ducts and injectors are in direct contact with the high-temperature gas generated by the combustion of the fuel in the combustion chamber, and bear and transfer part of the heat of the high-temperature gas; in addition, mechanical stress and thermal stress make the cylinder head base plate prone to fatigue deformation. The cylinder head is equipped with a cooling water chamber, which cools the heated parts through cooling water to improve their heat load and ensure their reliable use. If there are any casting defects such as sand holes and looseness in the cooling water chamber wall of the cylinder head, or there are cracks, as well as the intake and exhaust valve seats, and the assembly state between the injector sleeve and the cylinder head is poor, the cooling water will penetrate or directly leak into the combustion chamber. If the amount of cooling water that penetrates into the combustion chamber is small, it can burn with the fuel, causing scale deposition on the wall of the combustion chamber, directly affecting the heat transfer of the heated parts and causing them to overheat and damage; if the leakage is serious, the cooling water entering the combustion chamber may even cause the diesel engine to have a water hammer failure and be seriously damaged. The poor sealing of the cylinder head sand cleaning process plug (hole plug) causes cooling water leakage, which increases the water consumption, and its serious consequence is that it affects the completion of the locomotive operation route.

[0003] Therefore, in the process of manufacturing the cylinder head of the automobile, the air tightness detection plays a very important role in the driving safety of the whole vehicle. In view of this, whether it is a new cylinder head or an overhauled cylinder head, an air tightness test must be carried out to confirm that the water chamber wall and the intake and exhaust valve seats, the assembly status of the injector sleeve and the cylinder head, and the sealing status of the process plug are in good condition to ensure that the cylinder head is in good operating condition within an overhaul cycle. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a cylinder head air tightness detection device.

[0005] The technical solution of the present invention is as follows:

[0006] A cylinder head air tightness detection device, comprising:

[0007] frame,

[0008] A testing platform is arranged on the frame, and is used to place the cylinder head to be tested.

[0009] A clamping mechanism is arranged on the frame, and the clamping mechanism can contact the cylinder head and fix the cylinder head on the inspection table.

[0010] The detection mechanism is arranged on the frame, and the detection mechanism includes a sealing mechanism and an inflation mechanism. The sealing mechanism corresponds to the position of the channel opening of the air channel and / or the oil channel and / or the water channel on the cylinder head, and the sealing mechanism can move relative to the detection platform to approach the cylinder head and close the channel opening. The inflation mechanism is arranged on the sealing mechanism, and the inflation mechanism is communicated with the channel opening and can inflate gas into the channel opening.

[0011] The detection box is arranged on the frame, and liquid is arranged in the detection box. The detection box can move relative to the detection platform so that the cylinder head enters the detection box.

[0012] In a specific embodiment of the present invention, the sealing mechanism includes a driving device and a sealing block connected to the driving device, the sealing block corresponds to the position of the channel opening, and the sealing block can be driven by the driving device to move relative to the inspection table to approach the cylinder head and close the channel opening.

[0013] In a specific embodiment of the present invention, the inflation mechanism includes an air inlet pipe and an inflation port, the inflation port is arranged on the sealing block and is connected to the channel port, one end of the air inlet pipe is connected to the gas compression device, and the other end is connected to the inflation port so that gas can be filled into the channel port.

[0014] In a specific embodiment of the present invention, the detection mechanism includes a first detection mechanism, a second detection mechanism and a third detection mechanism, which are respectively used to detect the sealing of the air passage, the oil passage and the water passage on the cylinder head. The first detection mechanism is arranged above the detection platform, the second detection mechanism is arranged on both sides of the detection platform, and the third detection mechanism is arranged at the rear end of the detection platform. The first detection mechanism, the second detection mechanism and the third detection mechanism all include a sealing mechanism and an inflation mechanism.

[0015] In a specific embodiment of the present invention, a first detection mechanism includes a first driving device and a movable plate connected to the first driving device, a first sealing block is arranged on the movable plate, the first sealing block is located above the cylinder head and corresponds to the position of the channel opening at the top of the cylinder head, the movable plate is driven by the first driving device to move relative to the detection platform and approach the cylinder head, and the first sealing block can close the channel opening at the top of the cylinder head under the drive of the movable plate; the first detection mechanism also includes a first air intake pipe and a first charging port, the first charging port is arranged on the first sealing block and connected to the channel opening at the top of the cylinder head, one end of the first air intake pipe is connected to the gas compression device, and the other end is connected to the first charging port so as to charge gas into the channel opening at the top of the cylinder head.

[0016] In a specific embodiment of the present invention, the second detection mechanism includes a second driving device and a second sealing block connected to the second driving device, the second sealing blocks are located on both sides of the cylinder head and correspond to the positions of the channel openings at the side ends of the cylinder head, the second sealing blocks can be driven by the first driving device to move relative to the detection platform and approach the cylinder head, and can close the channel openings at the side ends of the cylinder head; the second detection mechanism also includes a second air intake pipe and a second charging port, the second charging port is arranged on the second sealing block and is connected to the channel opening at the side end of the cylinder head, one end of the second air intake pipe is connected to the gas compression device, and the other end is connected to the second charging port so as to charge gas into the channel opening at the side end of the cylinder head.

[0017] In a specific embodiment of the present invention, the third detection mechanism includes a third driving device and a third sealing block connected to the third driving device, the third sealing block is located at the rear end of the cylinder head and corresponds to the position of the channel opening at the rear end of the cylinder head, the third sealing block can be driven by the first driving device to move relative to the detection platform and approach the cylinder head, and can close the channel opening at the rear end of the cylinder head; the third detection mechanism also includes a third intake pipe and a third charging port, the third charging port is arranged on the third sealing block and is connected to the channel opening at the rear end of the cylinder head, one end of the third intake pipe is connected to the gas compression device, and the other end is connected to the third charging port so as to fill gas into the channel opening at the rear end of the cylinder head.

[0018] In a specific embodiment of the present invention, the clamping mechanism includes a clamping drive mechanism, a clamping plate and a clamping column, wherein the clamping plate is arranged above the cylinder head, the clamping column is arranged on the clamping plate and located above the cylinder head, the clamping plate is connected to the clamping drive mechanism and can move toward the cylinder head under the drive of the clamping drive mechanism, and the clamping column can contact and clamp the cylinder head under the drive of the clamping plate.

[0019] In a specific embodiment of the present invention, a fourth driving device is provided below the detection box, and the fourth driving device is connected to the detection box and can drive the detection box to move toward the detection platform so that the cylinder head can enter the detection box.

[0020] In a specific implementation manner of the present invention, the detection platform is further provided with a positioning plate, and the cylinder head is placed on the positioning plate.

[0021] The present invention has at least one of the following beneficial effects:

[0022] The cylinder head air tightness detection device of the present invention can detect the air tightness of the water channel, air channel and oil channel inside the cylinder head. After detecting the water channel, when switching to detecting the air channel and oil channel, there is no need to replace the detection equipment or move the position of the cylinder head, which can save detection time; the present invention can also detect the air tightness of the water channel, air channel and oil channel inside the cylinder head at the same time, and the detection efficiency is high. At the same time, the detection accuracy of the present invention is high, and the detection is convenient and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the cylinder head air tightness detection device in the present invention;

[0024] Figure 2 The cylinder head air tightness detection device of the present invention includes a structural schematic diagram of a cylinder head;

[0025] Figure 3 It is a partial structural schematic diagram of the cylinder head air tightness detection device in the present invention;

[0026] Figure 4 It is a partial structural schematic diagram of the pressing device in the present invention;

[0027] Figure 5 A schematic diagram of a part of the structure of the detection device in the present invention Figure 1 ;

[0028] Figure 6 A schematic diagram of a part of the structure of the detection device in the present invention Figure 2 ;

[0029] Figure 7 A schematic diagram of a part of the structure of the detection device in the present invention Figure 3 ;

[0030] Figure 8 It is a structural schematic diagram of the first sealing block in the present invention;

[0031] Fig. 9 for Figure 8 Schematic diagram of the internal structure;

[0032] Figure numerals: 1, frame; 2, test bench; 21, positioning plate; 3, clamping mechanism; 31, clamping drive mechanism; 32, clamping plate; 33, clamping column; 411, first drive device; 412, movable plate; 413, first sealing block; 414, first air intake pipe; 415, first air charging port; 416, air intake channel; 421, second drive device; 422, second sealing block; 423, second air intake pipe; 424, second air charging port; 431, third drive device; 432, third sealing block; 433, third air intake pipe; 434, third air charging port; 5, test box; 51, fourth drive device; 6, cylinder head; 60, channel opening. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with specific examples, but the present invention is not limited to the following specific examples.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] This embodiment provides a cylinder head sealing detection device, through which the airtightness of the cylinder head 6 is detected. The cylinder head 6 is manufactured.

[0037] The specific structure of the cylinder head 6 is as follows: the cylinder head 6 has a water channel and channel openings 60 at both ends of the water channel; an air channel and channel openings 60 at both ends of the air channel; an oil channel and channel openings 60 at both ends of the oil channel. Therefore, the cylinder head 6 has a plurality of channel openings 60, and the channel openings 60 are distributed at the top, side ends, and both end surfaces of the cylinder head 6. The structure of the cylinder head 6 is well known to those skilled in the art, and will not be described in detail in this embodiment.

[0038] Therefore, the cylinder head sealing detection device in this embodiment is used to detect the air tightness of the water channel, air channel and oil channel inside the cylinder head 6.

[0039] like Figures 1 to 9 As shown, the cylinder head sealing detection device in this embodiment includes a frame 1, a detection platform 2, a pressing mechanism 3, a detection mechanism and a detection box 5.

[0040] The testing table 2 is arranged on the frame 1. In the present embodiment, the testing table 2 is arranged horizontally. During the testing, the testing table 2 is used to place the cylinder head 6 to be tested. It can be understood that the testing table 2 is used to place the cylinder head 6. The testing table 2 is adapted to the bottom surface of the cylinder head 6 so that the cylinder head 6 is placed on the testing table 2 and can be fixed. After the cylinder head 6 on the testing table 2 is tested, it can be manually replaced by the operator.

[0041] In this embodiment, a positioning plate 21 is also provided on the testing platform 2, and the cylinder head 6 is placed on the positioning plate 21. The positioning function of the positioning plate 21 enables the cylinder head 6 to be placed in a suitable testing position; and the position of the positioning plate 21 can be adjusted. Specifically, the positioning plate 21 is installed on the testing platform 2 by bolts.

[0042] The clamping mechanism 3 is disposed on the frame 1 , and the clamping mechanism 3 can contact the cylinder head 6 and fix the cylinder head 6 on the testing platform 2 to prevent the position of the cylinder head 6 from moving during testing.

[0043] like Figure 4 As shown, in this embodiment, the clamping mechanism 3 includes a clamping drive mechanism 31, a clamping plate 32 and a clamping column 33. The clamping plate 32 is arranged above the cylinder head 6. The clamping column 33 is arranged on the clamping plate 32 and located above the cylinder head 6. The clamping plate 32 is connected to the clamping drive mechanism 31 and can move toward the cylinder head 6 under the drive of the clamping drive mechanism 31. The clamping column 33 can contact and clamp the cylinder head 6 under the drive of the clamping plate 32. Specifically, the number of the clamping columns 33 is an even number, and they are symmetrically arranged around the clamping plate 32, so as to fix the cylinder head 6 around. It is worth mentioning that the position of the clamping column 33 does not correspond to the position of the channel opening 60 of the water channel, air channel and oil channel on the cylinder head 6.

[0044] The detection box 5 is arranged on the frame 1, and liquid is arranged in the detection box 5, and specifically, the liquid can be water. In this embodiment, the detection box 5 is located below the detection platform 2. In other embodiments, the detection box 5 can also be located on both sides or at the front and rear ends of the detection platform 2. A fourth driving device 51 in the vertical direction is arranged below the detection box 5. The fourth driving device 51 is connected to the detection box 5 and can drive the detection box 5 to move up and down, so that the detection box 5 can move toward the detection platform 2, so that the cylinder head 6 can enter the detection box 5 and be completely immersed in the liquid in the detection box 5.

[0045] The detection mechanism is arranged on the frame 1, and the detection mechanism includes a sealing mechanism and an inflation mechanism. The sealing mechanism corresponds to the position of the channel openings 60 of the air channel, oil channel and water channel on the cylinder head 6, and the sealing mechanism can move relative to the detection platform 2 so as to be close to the cylinder head 6 and close the channel openings 60. The inflation mechanism is arranged on the sealing mechanism, and the inflation mechanism is connected to the channel openings 60 and can fill gas into the channel openings 60.

[0046] Specifically, the sealing mechanism includes a driving device and a sealing block connected to the driving device, the sealing block corresponds to the position of the channel opening 60, and the sealing block can be driven by the driving device to move relative to the test platform 2 to approach the cylinder head 6 and close the channel opening 60. The inflation mechanism includes an air intake pipe and an inflation port, the inflation port is arranged on the sealing block and communicated with the channel opening 60, one end of the air intake pipe is connected to the gas compression device, and the other end is communicated with the inflation port so that the channel opening 60 can be filled with gas.

[0047] Therefore, the gas of a certain pressure can be filled into the water channel, air channel and oil channel in the cylinder head 6 through the gas filling mechanism and maintained for a period of time, and the channel openings 60 of the water channel, air channel and oil channel are sealed by the sealing block on the sealing mechanism, so that the gas filled into the water channel, air channel and oil channel will not flow out from the channel openings 60. Since the cylinder head 6 is completely immersed in the liquid in the detection box 5, if there is a leaking part on the surface of the cylinder head 6, the gas inside the cylinder head 6 will overflow from the leaking part, and the operator can observe the generation of bubbles with the naked eye, and detect the air tightness of the cylinder head 6 according to the position and size of the bubbles. At this time, the air tightness detection of the cylinder head 6 can be completed by naked eye observation.

[0048] In this embodiment, the detection mechanism includes a first detection mechanism, a second detection mechanism and a third detection mechanism, which are respectively used to detect the sealing of the air channel, oil channel and water channel on the cylinder head 6. The first detection mechanism is arranged above the detection platform 2, the second detection mechanism is arranged on both sides of the detection platform 2, and the third detection mechanism is arranged at the rear end of the detection platform. The first detection mechanism, the second detection mechanism and the third detection mechanism all include a sealing mechanism and an inflation mechanism.

[0049] like Figure 5 As shown, the first detection mechanism includes a first driving device 411 and a moving plate 412 connected to the first driving device 411, and a first sealing block 413 is arranged on the moving plate 412. The first sealing block 413 is located above the cylinder head 6 and corresponds to the position of the channel opening 60 at the top of the cylinder head 6, and the number of the first sealing blocks 413 is the same as the number of the channel openings 60 at the top of the cylinder head 6. The moving plate 412 can move up and down relative to the detection platform 2 under the drive of the first driving device 411, so that the moving plate 412 can approach the cylinder head 6, and the first sealing block 413 can contact the cylinder head 6 under the drive of the moving plate 412 and close the channel opening 60 at the top of the cylinder head 6.

[0050] The first detection mechanism further includes a first air intake pipe 414 and a first air charging port 415. The first air charging port 415 is disposed on the first sealing block 413 and communicates with the channel port 60 at the top of the cylinder head 6. Specifically, the first air charging port 415 is disposed in the middle of the end of the first sealing block 413. An air intake channel 416 is provided inside the first sealing block 413, and the air intake channel 416 communicates with the first air charging port 415. One end of the first air intake pipe 414 is connected to the gas compression device, and the other end is communicated with the air intake channel 416 inside the first sealing block 413. Specifically, Fig. 9 As shown, gas can be introduced into the air intake channel 416 inside the first sealing block 413 through the first air intake pipe 414, and then enter the cylinder head 6 through the first air filling port 415 and the channel port 60 at the top of the cylinder head 6, and remain there for a certain period of time. If there is a leak on the surface of the cylinder head 6, the gas inside the cylinder head 6 will overflow from the leaking part, and the operator can observe the generation of bubbles with the naked eye, so as to detect the air tightness of the channel.

[0051] like Figures 6-7 As shown, the second detection mechanism includes a second driving device 421 and a second sealing block 422 connected to the second driving device 421, the second sealing blocks 422 are located on both sides of the cylinder head 6 and correspond to the positions of the channel openings 60 at the side ends of the cylinder head 6, the second sealing blocks 422 can move left and right relative to the detection platform 2 under the drive of the first driving device 421, so that the second sealing blocks 422 can approach the cylinder head 6 and can close the channel openings 60 at the side ends of the cylinder head 6.

[0052] The second detection mechanism also includes a second air inlet pipe 423 and a second air charging port 424. The second air charging port 424 is arranged on the second sealing block 422 and communicates with the channel port 60 at the side end of the cylinder head 6. One end of the second air inlet pipe 423 is connected to the gas compression device, and the other end is communicated with the second air charging port 424 so that gas can be charged into the channel port 60 at the side end of the cylinder head 6. It is worth mentioning that a gas channel communicating with the second air charging port 424 is arranged inside the second sealing block 422. One end of the second air inlet pipe 423 is connected to the gas compression device, and the other end is communicated with the gas channel inside the second sealing block 422, so that the gas in the second air inlet pipe 423 can enter the cylinder head 6 through the gas channel inside the second sealing block 422 and the second air charging port 424. If there is a leak on the surface of the cylinder head 6, the gas inside the cylinder head 6 will overflow from the leaking part. The operator can observe the generation of bubbles with the naked eye, and the air tightness of the channel can be detected.

[0053] like Figures 6-7 As shown, the third detection mechanism includes a third driving device 431 and a third sealing block 432 connected to the third driving device 431, the third sealing block 432 is located at the rear end of the cylinder head 6 and corresponds to the position of the channel opening 60 at the rear end of the cylinder head 6, the third sealing block 432 can be moved relative to the detection platform 2 and approach the cylinder head 6 under the drive of the first driving device 431, and can close the channel opening 60 at the rear end of the cylinder head 6; the third detection mechanism also includes a third air intake pipe 433 and a third charging port 434, the third charging port 434 is arranged on the third sealing block 432 and is connected to the channel opening 60 at the rear end of the cylinder head 6, one end of the third air intake pipe 433 is connected to the gas compression device, and the other end is connected to the third charging port 434 so as to fill gas into the channel opening 60 at the rear end of the cylinder head 6. It is worth mentioning that a gas channel connected to the third inflation port 434 is provided inside the third sealing block 432. One end of the third air intake pipe 433 is connected to the gas compression device, and the other end is connected to the gas channel inside the third sealing block 432. Therefore, the gas in the third air intake pipe 433 can enter the cylinder head 6 through the gas channel inside the third sealing block 432 and the third inflation port 434. If there is a leak on the surface of the cylinder head 6, the gas inside the cylinder head 6 will overflow from the leaking part, and the operator can observe the generation of bubbles with the naked eye to detect the air tightness of the channel.

[0054] Therefore, the cylinder head air tightness detection device in this embodiment can detect the air tightness of the water channel, air channel and oil channel inside the cylinder head. Compared with the detection device in the prior art which can only detect one of the channels and needs to replace the equipment or move the position of the cylinder head when detecting other channels, the cylinder head air tightness detection device in this embodiment can save detection time. This embodiment can also detect the air tightness of the water channel, air channel and oil channel inside the cylinder head 6 at the same time, with high detection efficiency and high detection accuracy, and convenient and simple detection.

[0055] This embodiment also provides a method for detecting the air tightness of a cylinder head by a device, comprising the following steps:

[0056] The cylinder head 6 to be inspected is placed on the inspection table 2, specifically, on the positioning plate 21;

[0057] The clamping mechanism 3 is turned on, and the clamping mechanism 3 moves relative to the cylinder head 6 to fix the cylinder head 6 on the inspection table 2; specifically, the clamping plate 32 moves toward the cylinder head 6 under the drive of the clamping drive mechanism 31, and the clamping column 33 is driven by the clamping plate 32 to contact and clamp the cylinder head 6 to fix the cylinder head 6 on the inspection table 2;

[0058] Turn on the gas compression equipment, check the exhaust conditions of the air intake pipe and the charging port, if the exhaust is normal and not blocked, respectively turn on the first detection mechanism, the second detection mechanism and the third detection mechanism to respectively detect the air passage, the oil passage and the water passage in the cylinder head 6; specifically, the first driving device 411 is turned on, the first driving device 411 drives the moving plate 412 to move relative to the cylinder head 6, the first sealing block 413 moves with the moving plate 412 to contact the top of the cylinder head 6, and closes the channel opening 60 at the top of the cylinder head 6, and fills the channel opening 60 at the top of the cylinder head 6 with gas through the first air intake pipe 414 and the first charging port 415, and keeps for a period of time;

[0059] Fill the test box 5 with liquid, move the test box 5 relative to the test platform 2 so that the cylinder head 6 enters the test box 5 and is immersed in the liquid in the test box 5. Specifically, start the fourth driving device 51, and the fourth driving device 51 drives the test box 5 to move toward the test platform 2 so that the cylinder head 6 can be immersed in the liquid in the test box 5.

[0060] If there is a leak on the surface of the cylinder head 6, the gas inside the cylinder head 6 will overflow from the leaking part, and bubbles will be generated in the liquid of the detection box 5. The operator can observe the generation of bubbles with the naked eye to detect the air tightness of the channel.

[0061] Similarly, repeat the above process, turn on the second driving device 421, the second driving device 421 drives the second sealing block 422 to move relative to the cylinder head 6, the second sealing block 422 contacts both sides of the cylinder head 6, and closes the channel openings 60 on both sides of the cylinder head 6, and fills the channel openings 60 on both sides of the cylinder head 6 through the second air inlet pipe 423 and the second air filling port 424, and maintains gas for a period of time; the detection box 5 moves relative to the detection table 2 so that the cylinder head 6 enters the detection box 5 and is immersed in the liquid of the detection box 5; if there is a leak on the surface of the cylinder head 6, the gas inside the cylinder head 6 will overflow from the leaking part, and bubbles will be generated in the liquid of the detection box 5. The operator can observe the generation of bubbles with the naked eye, so as to detect the air tightness of the channel.

[0062] Similarly, repeat the above process, turn on the third driving device 431, the third driving device 431 drives the third sealing block 432 to move relative to the cylinder head 6, the third sealing block 432 contacts both sides of the cylinder head 6, and closes the channel openings 60 on both sides of the cylinder head 6, and fills gas into the channel opening 60 on the rear end surface of the cylinder head 6 through the third air inlet pipe 433 and the third air filling port 434, and maintains it for a period of time; the detection box 5 moves relative to the detection table 2 so that the cylinder head 6 enters the detection box 5 and is immersed in the liquid of the detection box 5; if there is a leak on the surface of the cylinder head 6, the gas inside the cylinder head 6 will overflow from the leaking part, and bubbles will be generated in the liquid of the detection box 5. The operator can observe the generation of bubbles with the naked eye, so as to detect the air tightness of the channel.

[0063] Therefore, the cylinder head air tightness detection device in this embodiment can detect the air tightness of the water channel, air channel and oil channel inside the cylinder head 6 respectively, and can also detect the air tightness of the water channel, air channel and oil channel inside the cylinder head 6 at the same time. The detection is convenient and simple. When the detection of one channel is completed, there is no need to re-move the position of the cylinder head 6 when detecting another channel, thereby saving detection time and improving detection efficiency.

[0064] The above are only examples of the features of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent exchange or equivalent replacement falls within the protection scope of the present invention.

Claims

1. A cylinder head air tightness detection device, characterized in that: include: Rack(1), a testing platform (2) arranged on the frame (1), the testing platform (2) being used to place a cylinder head (6) to be tested, a clamping mechanism (3) arranged on the frame (1), the clamping mechanism (3) being able to contact the cylinder head (6) and fix the cylinder head (6) on the testing platform (2), A detection mechanism, which is arranged on the frame (1), the detection mechanism comprises a sealing mechanism and an air charging mechanism, the sealing mechanism corresponds to the position of a channel opening (60) of an air channel and / or an oil channel and / or a water channel on a cylinder head (6), and the sealing mechanism can move relative to the detection platform (2) so as to be close to the cylinder head (6) and seal the channel opening (60), the air charging mechanism is arranged on the sealing mechanism, the air charging mechanism is in communication with the channel opening (60) and can charge gas into the channel opening (60), a detection box (5), which is arranged on the frame (1), a liquid is arranged in the detection box (5), and the detection box (5) can move relative to the detection platform (2) so as to allow the cylinder head (6) to enter the detection box (5); The detection mechanism comprises a first detection mechanism, a second detection mechanism and a third detection mechanism respectively used to detect the sealing properties of the air passage, the oil passage and the water passage on the cylinder head (6), the first detection mechanism being arranged above the detection platform (2), the second detection mechanism being arranged on both sides of the detection platform (2), the third detection mechanism being arranged at the rear end of the detection platform, and the first detection mechanism, the second detection mechanism and the third detection mechanism all comprising a sealing mechanism and an air charging mechanism; The first detection mechanism comprises a first driving device (411) and a moving plate (412) connected to the first driving device (411); a first sealing block (413) is arranged on the moving plate (412); the first sealing block (413) is located above the cylinder head (6) and corresponds to the position of the channel opening (60) at the top of the cylinder head (6); the moving plate (412) moves relative to the detection platform (2) and approaches the cylinder head (6) under the drive of the first driving device (411); the first sealing block (413) is The movable plate (412) is driven to seal the channel opening (60) at the top of the cylinder head (6); the first detection mechanism also includes a first air intake pipe (414) and a first air charging port (415); the first air charging port (415) is arranged on the first sealing block (413) and is connected to the channel opening (60) at the top of the cylinder head (6); one end of the first air intake pipe (414) is connected to a gas compression device, and the other end is connected to the first air charging port (415) so as to charge gas into the channel opening (60) at the top of the cylinder head (6); The second detection mechanism comprises a second driving device (421) and a second sealing block (422) connected to the second driving device (421), the second sealing block (422) being located on both sides of the cylinder head (6) and corresponding to the position of the channel opening (60) at the side end of the cylinder head (6), the second sealing block (422) being able to move relative to the detection platform (2) and approach the cylinder head (6) under the drive of the first driving device (421), and being able to seal the channel opening (60) at the side end of the cylinder head (6); the second detection mechanism also comprises a second air intake pipe (423) and a second air charging port (424), the second air charging port (424) being arranged on the second sealing block (422) and being connected to the channel opening (60) at the side end of the cylinder head (6), one end of the second air intake pipe (423) being connected to the gas compression device, and the other end being connected to the second air charging port (424) so ​​as to charge gas into the channel opening (60) at the side end of the cylinder head (6); The third detection mechanism comprises a third driving device (431) and a third sealing block (432) connected to the third driving device (431); the third sealing block (432) is located at the rear end of the cylinder head (6) and corresponds to the position of the channel opening (60) at the rear end of the cylinder head (6); the third sealing block (432) can be driven by the first driving device (431) to move relative to the detection platform (2) and approach the cylinder head (6), and can seal the channel opening (60) at the rear end of the cylinder head (6); the third detection mechanism also comprises a third air intake pipe (433) and a third air charging port (434); the third air charging port (434) is arranged on the third sealing block (432) and communicates with the channel opening (60) at the rear end of the cylinder head (6); one end of the third air intake pipe (433) is connected to the gas compression device, and the other end is communicated with the third air charging port (434) so ​​as to charge gas into the channel opening (60) at the rear end of the cylinder head (6).

2. A cylinder head air tightness detection device according to claim 1, characterized in that: The sealing mechanism comprises a driving device and a sealing block connected to the driving device, the sealing block corresponds to the position of the channel opening (60), and the sealing block can be driven by the driving device to move relative to the inspection platform (2) to approach the cylinder head (6) and close the channel opening (60).

3. A cylinder head air tightness detection device according to claim 2, characterized in that: The inflation mechanism comprises an air inlet pipe and an inflation port, wherein the inflation port is arranged on the sealing block and communicated with the channel port (60), one end of the air inlet pipe is connected to a gas compression device, and the other end is communicated with the inflation port so that gas can be injected into the channel port (60).

4. The cylinder head air tightness detection device according to claim 1, characterized in that: The clamping mechanism (3) comprises a clamping drive mechanism (31), a clamping plate (32) and a clamping column (33); the clamping plate (32) is arranged above the cylinder head (6); the clamping column (33) is arranged on the clamping plate (32) and is located above the cylinder head (6); the clamping plate (32) is connected to the clamping drive mechanism (31) and can move toward the cylinder head (6) under the drive of the clamping drive mechanism (31); the clamping column (33) can contact and clamp the cylinder head (6) under the drive of the clamping plate (32).

5. The cylinder head air tightness detection device according to claim 1, characterized in that: A fourth driving device (51) is provided below the detection box (5), and the fourth driving device (51) is connected to the detection box (5) and can drive the detection box (5) to move toward the detection table (2) so that the cylinder head (6) can enter the detection box (5).

6. The cylinder head air tightness detection device according to claim 1, characterized in that: The detection platform (2) is also provided with a positioning plate (21), and the cylinder head (6) is placed on the positioning plate (21).

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