Air tightness test equipment for cylinder body casting

Abstract

The invention discloses air tightness test equipment for a cylinder body casting, and the equipment comprises a detection container, a positioning assembly which is used for fixing a cylinder body, a sealing assembly which is used for connecting the cylinder body, and a detection assembly which is used for carrying out ventilation detection. The detection assembly is suitable for being inserted into an air vent of a casting to detect air tightness. A detection cavity at the top, a liquid storage cavity at the bottom and a middle plate for forming a partition in the middle are formed in the detection container, at least one drainage tube is arranged between the bottom of the liquid storage cavity and the bottom of the detection cavity, and the liquid storage cavity is provided with a driving structure; and the driving structure is suitable for enabling detection liquid to flow between the detection cavity and the liquid storage cavity in two directions through the drainage tube.

Description

Technical Field

[0001] This application relates to the field of engine parts technology, and in particular to a test device for the airtightness of cylinder block castings. Background Technology

[0002] Currently, some engine cylinder blocks are formed using casting technology, which integrates complex chambers such as water channels, oil channels, and cylinder cavities. Defects such as porosity and cracks are prone to occur during the casting process. If the cylinder block's airtightness does not meet the standards, it will lead to leakage, oil deterioration, or a drop in cylinder pressure, directly affecting the engine's power output, fuel efficiency, and operational reliability. Therefore, such castings must undergo rigorous airtightness testing after forming.

[0003] Immersion and aeration testing of castings for airtightness can pinpoint the location of cracks and visually display their size. Therefore, although relatively cumbersome, it remains irreplaceable in certain scenarios. However, airtightness testing using such equipment relies on manual observation of bubble formation, making its accuracy highly dependent on the experience of the inspector and prone to missing minute leaks. While some automated testing equipment can improve efficiency, it lacks sufficient coverage of dead corners or deep holes in complex chambers, making it difficult to detect hidden minute defects. For new lightweight materials such as aluminum alloys, existing testing parameters have poor adaptability, leading to inaccurate results. Furthermore, some methods require disassembling cylinder components, increasing labor intensity and time costs, making it difficult to meet the high-efficiency requirements of large-scale production. During testing, the cylinder is completely immersed in a water tank, and dry compressed air at a pressure of 0.3~0.8MPa is injected through a pre-drilled testing hole in the cylinder. This is maintained for a certain period (generally 1~3 minutes), and the presence of continuous bubbles on the cylinder surface is observed to determine the location and extent of the leak.

[0004] During the airtightness test, the cylinder casting needs to be immersed in the test liquid, and after the test, the cylinder casting needs to be removed, and so on. When the cylinder casting is installed into the test container, the test liquid is added and discharged by conventional pumping, but the flow efficiency of the test liquid is poor. In addition, the test liquid is frequently drawn and circulated externally, which occupies a lot of space and has poor utilization. Summary of the Invention

[0005] The purpose of this application is to provide an airtightness testing device for cylinder castings.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: an airtightness testing device for a cylinder casting, comprising a testing container, a positioning assembly for fixing the cylinder, a sealing assembly for connecting the cylinder, and a testing assembly for performing ventilation testing. The sealing assembly is adapted to seal all cylinders of the cylinder casting, and the testing assembly is adapted to be inserted into the ventilation port of the casting to test airtightness. The testing container forms a top testing chamber, a bottom liquid storage chamber, and an intermediate plate for forming a partition in the middle. At least one drainage pipe is provided between the bottom of the liquid storage chamber and the bottom of the testing chamber. The liquid storage chamber is provided with a driving structure, which is adapted to allow the testing liquid to flow bidirectionally between the testing chamber and the liquid storage chamber through the drainage pipe.

[0007] As a preferred embodiment, the driving structure includes a telescopic member disposed within the liquid storage cavity. The telescopic member changes its external volume by extending and retracting. When the volume of the telescopic member expands, the liquid in the liquid storage cavity enters the detection cavity, and when the volume of the telescopic member contracts, the detection liquid returns from the detection cavity to the liquid storage cavity, thereby forming an internal circulation of the detection liquid.

[0008] As a preferred embodiment, the liquid storage chamber is further provided with an inlet and an outlet, which are used for feeding and discharging materials respectively to form an external circulation of the detection liquid; when the telescopic component is not in use, the outlet is closed and the liquid is continuously pressurized and fed in through the inlet, so that the detection liquid fills the liquid storage chamber and enters the detection chamber through the drainage tube.

[0009] Preferably, the telescopic member is located in the middle of the liquid storage chamber, and the drainage tube is provided by the detection chamber and inserted into the bottom of the four corners of the liquid storage chamber; the telescopic member maintains a distance from the drainage tube when it expands to its maximum volume; the telescopic member includes a fixed part and a movable part sealed to the fixed part, the movable part is foldable, and when the movable part is unfolded, an air chamber is formed between the movable part and the fixed part; the fixed part is connected to an air pipe for air intake or exhaust, and the air pipe is connected to the outside atmosphere; when the volume of the air chamber increases, outside air enters the air chamber; when the volume of the air chamber decreases, the gas inside the air chamber is discharged to the outside atmosphere.

[0010] As a preferred embodiment, the movable part includes an external corrugated folding part and a guide frame for folding, and a telescopic drive part is provided on the side or bottom of the movable part, the telescopic drive part being adapted to drive the corrugated folding part to unfold or retract.

[0011] As a preferred embodiment, a positioning plate is provided at the bottom of the cylinder casting, and the cylinder casting is fixed on the positioning plate; the positioning plate has multiple positioning parts for limiting the position of the cylinder casting, and a detection platform is formed on the middle plate. The positioning component performs positioning in the first direction, the detection component performs detection in the second direction, and the positioning parts limit the cylinder casting to slide in the first direction.

[0012] As a preferred embodiment, the detection component includes at least two detection ports, and adjacent detection ports correspond to two cylinders spaced apart on the cylinder casting.

[0013] As a preferred embodiment, the cylinder casting has at least three cylinders; at least two fixed points are formed at intervals along a first direction above the testing platform, and the distance between two adjacent fixed points is the same as the distance between adjacent cylinders on the cylinder casting. When the cylinder casting is fixed at two of the fixed points respectively, the testing assembly performs airtightness tests on both sides.

[0014] As a preferred embodiment, the sealing assembly includes a plug that mates with a channel in the casting and a drive mechanism for moving the plug. After the casting is positioned, the drive mechanism causes the plug to mate with the casting to close the channel in the casting.

[0015] As a preferred embodiment, the positioning component further includes an abutting mechanism and a positioning mating part. After the cylinder casting is transferred to the detection platform in a set posture, the abutting mechanism pushes the cylinder casting to move and cooperates with the positioning mating part to abut against it. The positioning part, the positioning plate, the abutting mechanism, and the positioning mating part together form the positioning component described above. The positioning part has at least two locations on both sides corresponding to the first direction.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: The detection device is divided into a detection chamber and a storage chamber by a central plate using a drainage tube and a drive structure. The bottom of the storage chamber and the bottom of the detection chamber are connected. The flow of the detection fluid in both chambers is regulated by changing the pressure within the storage chamber via the drive structure. Specifically, when the pressure in the storage chamber increases, the detection fluid flows from the storage chamber into the detection chamber; when the pressure in the storage chamber decreases, the detection fluid returns from the detection chamber to the storage chamber. The control principle is simple, the operation is convenient, and the detection fluid can be easily recycled. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of one embodiment of this application.

[0018] Figure 2 yes Figure 1 The diagram shows a telescopic component.

[0019] Figure 3 yes Figure 2 A schematic diagram of the telescopic component.

[0020] Figure 4 yes Figure 3 A schematic diagram of the telescopic component when it is open.

[0021] Figure 5 yes Figure 1 A schematic diagram of the internal structure from a frontal view.

[0022] Figure 6 yes Figure 1 A diagram taken from a top-down perspective.

[0023] Figure 7 yes Figure 1 A three-dimensional schematic diagram of the internal structure.

[0024] Figure 8 This is a schematic diagram showing the simultaneous and intermittent detection of the cylinder body and cylinders by the detection ports.

[0025] In the diagram: 1. Detection component; 2. Detection platform; 3. Positioning component; 4. Detection container; 41. Detection chamber; 42. Liquid storage chamber; 5. Drive pipeline; 6. Liquid outlet; 7. Corrugated fold; 8. Telescopic drive; 9. Fixing part; 91. Pressure regulating pipe; 10. Guide part; 11. Detection port; 12. Sealing component; 13. Drainage pipe; 15. Positioning component; 151. Positioning mating part; 16. Positioning plate; 17. Positioning part; 18. Intermediate plate; 19. Slider; 20. Guide frame. Detailed Implementation

[0026] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0028] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0029] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0030] Example: Reference Figures 1 to 8 This embodiment proposes a cylinder airtightness testing device, including a testing container 4, a positioning component 153 for fixing the cylinder, a sealing component 12 for connecting the cylinder, and a testing component 1 for performing ventilation testing. The sealing component 12 is adapted to seal all cylinders of the cylinder casting, and the testing component 1 is adapted to be inserted into the ventilation port of the casting to test airtightness. The testing container 4 forms a top testing chamber 41, a bottom liquid storage chamber 42, and an intermediate plate 18 for forming a partition in the middle. At least one drainage pipe 13 is disposed between the bottom of the liquid storage chamber 42 and the bottom of the testing chamber 41. The liquid storage chamber 42 is provided with a driving structure, which is adapted to allow the testing liquid to flow bidirectionally between the testing chamber 41 and the liquid storage chamber 42 through the drainage pipe 13.

[0031] The drainage tube 13 serves as a channel connecting the detection chamber 41 and the storage chamber 42. Multiple tubes can be installed, for example, four, inserted into the four corners of the storage chamber 42 at the four corners of the detection chamber 41. This allows for bidirectional flow of liquid between the storage chamber 42 and the detection chamber 41, with different areas communicating to ensure uniform liquid flow. In this embodiment, "bidirectional flow" means that the detection liquid can flow back and forth between the detection chamber 41 and the storage chamber 42. However, when liquid is discharged or injected into the detection chamber 41, the detection liquid flows unidirectionally; that is, in each process, the detection liquid only moves from one chamber to another and does not flow back and forth.

[0032] Since the testing fluid in this application is only used for airtightness testing, after testing, apart from some foam and a small amount of oil, there are almost no other impurities. Therefore, the testing fluid usually only needs a simple filtration process to remove foam and impurities. In the initial airtightness testing at the factory, the water immersion method is usually not used. The water immersion method requires installing the workpiece in a specific position (immersing it in water) and then performing a series of steps such as positioning, sealing, and introducing compressed gas. Typically, a compressed gas is directly introduced using an airtightness testing machine, and then the pressure change is measured to determine the airtightness. After measurement, products that fail the airtightness test will be further tested based on their airtightness level. Workpieces with airtightness within a certain range will be further tested, and after testing, it will be determined whether to repair or discard and recycle them. The water immersion method can determine the specific location and degree of leakage in the cylinder casting by the position and number of bubbles, thus facilitating the subsequent determination of whether to retain or discard the casting.

[0033] During airtightness testing, it is best to seal the cylinder casting before immersing it in water. Therefore, the flow of the testing liquid in the testing chamber 41 needs to be convenient, i.e., how to quickly pour the testing liquid into the testing chamber 41 to achieve a sufficient testing height, and at the same time, how to easily drain the testing liquid after the test is completed.

[0034] like Figure 2 , Figure 3 and Figure 4 This application utilizes a drainage pipe 13 and a drive structure to separate the detection device from the middle using an intermediate plate 18, forming a detection chamber 41 and a storage chamber 42. The bottom of the storage chamber 42 is connected to the bottom of the detection chamber 41. By changing the pressure within the storage chamber 42 through the drive structure, the flow of the detection liquid in both chambers is regulated. Specifically, when the pressure in the storage chamber 42 increases, the detection liquid flows from the storage chamber 42 into the detection chamber 41; when the pressure in the storage chamber 42 decreases, the detection liquid returns from the detection chamber 41 to the storage chamber 42. The control principle is simple, the operation is convenient, and the detection liquid can be easily recycled.

[0035] On the other hand, when the detection liquid returns from the detection chamber 41 to the storage chamber 42, the detection liquid can carry most of the foam and impurities back to the storage chamber 42. After a certain period of time, the foam and oil impurities basically float on the top of the storage chamber 42. When the next test is performed, the storage chamber 42 is pressurized and liquid is added from the bottom to the detection chamber 41. Therefore, the foam and oil will not enter the detection chamber 41 and will not affect the detection of the detection chamber 41.

[0036] Currently, there are generally two methods for testing the airtightness of workpieces using the water immersion method. One is through manual observation, which requires skilled and experienced operators, is labor-intensive, and prone to oversight. The other is through a high-precision vision camera, which can automatically identify information such as the number, size, and location of bubbles. In both methods, impurities in the detection chamber 41 can affect the judgment to some extent.

[0037] like Figure 3 The liquid storage chamber 42 is equipped with a liquid inlet (in Figure 3 The upper right side of the middle) and the outlet 6, the inlet and outlet 6 are used for feeding and discharging respectively to form an external circulation of the test liquid; when no other structure is added, the driving structure can be a pump body for suction. At this time, the outlet 6 is closed and the liquid is continuously pressurized and fed in through the inlet. The test liquid fills the storage chamber 42 and enters the test chamber 41 through the guide pipe 13. After the test liquid reaches the predetermined height, the inlet is closed; after the test is completed, the outlet 6 is opened, the pressure of the test liquid in the storage chamber 42 decreases, and the test liquid in the test chamber 41 enters the storage chamber 42.

[0038] In some embodiments, the drive structure includes a telescopic member disposed within a liquid storage chamber 42. The telescopic member changes its external volume by extending and retracting. Liquid within the liquid storage chamber 42 enters the detection chamber 41 when the telescopic member expands, and returns from the detection chamber 41 to the liquid storage chamber 42 when the telescopic member contracts, thus forming an internal circulation of the detection liquid. That is, as the volume occupied by the telescopic member in the liquid storage chamber 42 changes, the pressure within the liquid storage chamber 42 also changes accordingly. For example, if the liquid in the liquid storage chamber 42 does not enter other chambers when the volume of the telescopic member increases, the hydraulic pressure will increase.

[0039] The preferred telescopic component is located in the center of the liquid storage chamber 42. The drainage tube 13 is provided by the detection chamber 41 and inserted into the bottom of the four corners of the liquid storage chamber 42. The telescopic component maintains a distance from the drainage tube 13 when it expands to its maximum volume. The telescopic component includes a fixed part 9 and a movable part that is sealed to the fixed part 9. The movable part is foldable. When the movable part is unfolded, an air chamber is formed between it and the fixed part 9. The fixed part 9 is connected to an air pipe for air intake or exhaust, and the air pipe is open to the outside atmosphere. When the volume of the air chamber increases, outside air enters the air chamber; when the volume of the air chamber decreases, the gas inside the air chamber is discharged to the outside atmosphere. The telescopic component is installed in the center of the liquid storage chamber 42 specifically to limit it from the edges of the four corners. Here, "center" does not mean exactly in the middle, but rather the area excluding the edges. The edges are used to set the drainage tube 13.

[0040] The movable part includes an external corrugated folding part 7 and a guide frame 20 for folding. A telescopic drive part 8 is provided on the side or bottom of the movable part, which is adapted to drive the corrugated folding part 7 to unfold or retract. At this time, the fixing part 9 can be installed in the liquid storage cavity 42 near one edge. The fixing part 9 and the drainage tube 13 are still kept at a certain distance. At this time, with the fixing part 9 as the starting point, the movable part moves to the other side, causing the corrugated folding part 7 to unfold, thereby reducing the internal volume of the liquid storage cavity 42, and the detection liquid in the liquid storage cavity 42 flows into the detection cavity 41; when the movable part retracts, the corrugated folding part 7 retracts, the volume of the liquid storage cavity 42 increases, and the detection liquid in the detection cavity 41 returns to the liquid storage cavity 42.

[0041] The guide frame 20 can be configured as follows: Figure 7 The square plate shown has a through hole in its middle, through which a guide part 10 (guide rod) passes and is fixed to the wall of the testing container 4. When the corrugated folded part 7 is unfolded, its middle part is supported by the cooperation of the guide frame 20 and the guide part 10 to prevent the corrugated folded part 7 from being squeezed and deformed by hydraulic pressure.

[0042] The volume of the liquid storage chamber 42 changes by folding and unfolding. This method eliminates the need for frequent replacement of the detection liquid. The detection liquid flows back and forth between the liquid storage chamber 42 and the detection chamber 41. When folding, this application proposes the following two schemes.

[0043] (1) The corrugated folded part 7 is located in the middle of the liquid storage cavity 42. When unfolded, the corrugated folded part 7 unfolds from the middle to both sides.

[0044] In this design, it is best to ensure that the speed of unfolding to both sides is the same or similar. A motor can be set to drive the screw to rotate, and the screw has threads in different directions from the middle to both sides. Sliders 19 are set on both sides of the middle of the corrugated folded part 7. The slides 19 and the screw are threaded together. Rotating the screw drives the slides 19 to move towards or away from each other, so that the corrugated folded part 7 can be folded up or unfolded.

[0045] (2) The corrugated folded part 7 is provided on one side of the liquid storage cavity 42, and is kept at a certain distance from the drainage tube 13. When unfolded, it extends from one side of the liquid storage cavity 42 to the other side.

[0046] like Figure 2 Since the corrugated folded section 7 is affected by hydraulic pressure when it extends or retracts in the liquid, a pressure regulating pipe 91 can be installed on the right side of the fixing part 9. The pressure regulating pipe 91 can extend out of the test container and has a valve on the outside. The valve opens when the section extends and closes after the section has extended. At this time, the test chamber performs the test. After the test is completed, the valve is opened again, and the corrugated folded section 7 is driven to fold. Then the valve is closed again. During the airtightness test, the valve can be closed to allow gas inside the corrugated folded section 7 to enter and seal, thereby counteracting the effect of hydraulic pressure on the corrugated folded section 7.

[0047] In this design, the movement of the corrugated folding section 7 and the guide frame 20 can be driven by a cylinder / hydraulic cylinder or a lead screw slide. Specifically, a telescopic rod is provided on the bottom or side of the corrugated folding section 7, with the end of the rod connected to the cylinder / hydraulic cylinder. When the rod is extended, the corrugated folding section 7 and the guide frame 20 can be opened. Or as... Figure 4 As shown, the telescopic drive unit 8 is configured as a lead screw, and a threaded slider 19 is provided on the corrugated folding part 7. A motor drives the lead screw to rotate, and the thread acts on the slider 19, causing the corrugated folding part 7 to open. At this time, at least the outermost side of the movable end is provided with the slider 19.

[0048] Currently, most automotive engines have three or more cylinders. During testing, the number of inspection heads can be increased to improve efficiency. However, the spacing between engine cylinders is limited. If it's necessary to determine the location and size of a leak simultaneously, testing adjacent cylinders at the same time can lead to misleading judgments. (Refer to...) Figure 8 (1), Figure 8 In (1), it is impossible to determine whether cylinder 1 or cylinder 2 is leaking. In particular, when both adjacent cylinders are leaking, it is easy to cause false detection, whether by manual observation or visual camera identification, which has a great interference effect on the detection.

[0049] Therefore, this application optimizes the detection component 1 by performing at least two detections, each detecting a cylinder at a corresponding detection interval. This ensures that the cylinders being detected simultaneously have a gap, and since adjacent cylinders are not detected simultaneously, the leak location can be accurately determined, reducing the possibility of interference. (Refer to...) Figure 8 (2), at this time, cylinders 1 and 3 are being tested, therefore Figure 8 (2) Only cylinder number 1 will leak air.

[0050] Regarding the positioning of the cylinder block casting in this embodiment, refer to... Figure 4 As shown, a positioning plate 16 is provided at the bottom of the cylinder casting, and the cylinder casting is fixed on the positioning plate 16. The positioning plate 16 has a plurality of positioning parts 17 for limiting the position of the cylinder casting (i.e., at least two are provided at intervals to ensure multiple point restrictions). A detection platform 2 is formed on the intermediate plate 18. The positioning component 153 performs positioning in the first direction, and the detection component 1 performs detection in the second direction. The positioning part 17 restricts the cylinder casting from sliding in the first direction.

[0051] A preferred detection component 1 includes at least two detection ports 11, with adjacent detection ports 11 corresponding to two spaced-apart cylinders on the cylinder casting. The cylinder casting has at least three cylinders; at least two fixed points are formed at intervals along a first direction above the detection platform 2, the distance between two adjacent fixed points being the same as the spacing between adjacent cylinders on the cylinder casting. When the cylinder casting is fixed at the two fixed points, the detection component 1 performs airtightness tests on both sides. Alternatively, only one fixed point can be provided, and the detection ports 11 on the detection component 1 can be moved. This allows for the detection of all cylinders in the cylinder to be completed after the initial test by moving the detection ports 11. The movement of the detection ports 11 can be achieved by using a driving component such as a cylinder.

[0052] This application specifies at least two inspection ports 11. For example, in the case of a three-cylinder or four-cylinder engine, the airtightness of all cylinders can be checked through two inspections. When the number of cylinders exceeds four, the airtightness of all cylinders can be tested by increasing the number of inspection ports 11 or increasing the number of inspections. For example, with five cylinders, three inspection ports 11 can be set at intervals, and the airtightness test of all cylinders can be completed through two inspections. Alternatively, with five cylinders, there are still two inspection ports 11. Cylinders 1 and 3 can be tested first, followed by cylinders 2 and 4, and finally cylinders 3 and 5, or only cylinder 5 can be tested at the end. As the number of cylinders gradually increases, the number of inspection ports 11 and the number of inspections can be flexibly changed as needed to achieve the purpose of testing all cylinders.

[0053] In some operating scenarios, for example, numbers 1, 3, and 5 can be tested, followed by numbers 2, 4, and 6, thus completing the airtightness test of a six-cylinder engine in two tests.

[0054] In some operating scenarios, cylinders can be tested in the following order: cylinders 1 and 3, followed by cylinders 2 and 4, followed by cylinders 3 and 5, followed by cylinders 4 and 6. This allows all cylinders except cylinder 1 to be tested twice.

[0055] In some operating scenarios, the number of test ports 11 can be the same as or more than the number of cylinders in the cylinder block. By opening the test ports 11 at intervals, airtightness tests can be performed on only the cylinders at intervals during the same period.

[0056] In the airtightness test, the cylinder must be sealed. This application can provide a sealing component 12 to block one end of the cylinder, and the other end of the cylinder is sealed through the test port 11 during the test.

[0057] Alternatively, in some embodiments, the sealing assembly 12 seals both ends of the cylinder and provides a one-way valve at one end. During testing, the detection port 11 opens the one-way valve to allow compressed gas to enter, thereby performing the test.

[0058] Reference Figure 2 The sealing assembly 12 mainly includes a plug that mates with the channel in the casting and a drive mechanism for moving the plug. After the casting is positioned, the drive mechanism drives the plug to mate with the casting, thereby closing the channel in the casting. The drive mechanism only needs to be capable of linear drive and can be implemented using a cylinder / hydraulic cylinder or similar structure. This application does not focus on the sealing assembly 12; therefore, the sealing assembly 12 is only presented as a relevant technical feature and is not subject to excessive limitations.

[0059] Reference Figure 2 , Figure 5 The positioning component 153 of this application includes an abutting mechanism and a positioning mating part 151. After the casting is transferred to the inspection platform 2 in a set posture, the positioning part 17 restricts its movement to only along a first direction. Subsequently, the abutting mechanism pushes the casting to move and cooperates with the positioning mating part 151 to abut and thus perform positioning. The positioning part 17, the positioning plate 16, the abutting mechanism, and the positioning mating part 151 together form the positioning component 153.

[0060] The abutting mechanism can be configured as a linearly driven device such as a cylinder or hydraulic cylinder. To further increase the flexibility of positioning, the positioning mating part 151 can also be configured as a cylinder or other device. When positioning, the cylinder body can be positioned at any position by adjusting the extension and retraction of the cylinders on both sides.

[0061] Positioning unit 17 reference Figure 5 As shown, at least two locations are provided on both sides corresponding to the first direction. The cylinder casting is fixed by the cooperation of the abutment mechanism and the positioning mating part 151. The bottom plane of the cylinder casting is initially fixed with the positioning plate 16. The positioning plate 16 can be provided with a structure that adapts to the bottom of the cylinder casting. Then, the abutment mechanism pushes the cylinder casting. At this time, the positioning part 17 can act on the positioning plate 16, so that when the cylinder casting is driven to move, the specific limiting part is the positioning plate 16, rather than the cylinder casting with holes and irregular shapes.

[0062] like Figure 1 , Figure 2 and Figure 6 As shown, the preferred device for driving in this application is a pneumatic cylinder or a hydraulic cylinder, and the corresponding pneumatic / hydraulic pipes can be found in [reference needed]. Figure 1 The drive pipe 5 is shown.

[0063] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A test device for the airtightness of a cylinder casting, characterized in that, The device includes a testing container, a positioning assembly for fixing the cylinder body, a sealing assembly for connecting the cylinder body, and a testing assembly for performing air tightness testing. The sealing assembly is adapted to seal all cylinders of the cylinder body casting, and the testing assembly is adapted to be inserted into the air vent of the casting to test air tightness. The detection container has a top detection chamber, a bottom liquid storage chamber, and an intermediate plate for forming a partition in the middle. At least one drainage tube is provided between the bottom of the liquid storage chamber and the bottom of the detection chamber. The liquid storage chamber is provided with a driving structure, which is adapted to allow the detection liquid to flow bidirectionally between the detection chamber and the liquid storage chamber through the drainage tube.

2. The airtightness testing equipment for cylinder castings as described in claim 1, characterized in that, The driving structure includes a telescopic member disposed within the liquid storage cavity. The telescopic member changes its external volume by extending and retracting. When the volume of the telescopic member expands, the liquid in the liquid storage cavity enters the detection cavity, and when the volume of the telescopic member shrinks, the detection liquid returns from the detection cavity to the liquid storage cavity, thus forming an internal circulation of the detection liquid.

3. The airtightness testing equipment for cylinder castings as described in claim 2, characterized in that, The liquid storage chamber is also provided with an inlet and an outlet, which are used for feeding and discharging materials respectively to form an external circulation of the detection liquid; when the telescopic component is not in use, the outlet is closed and the liquid is continuously pressurized and fed in through the inlet, so that the detection liquid fills the liquid storage chamber and enters the detection chamber through the drainage tube.

4. The airtightness testing equipment for cylinder castings as described in claim 2, characterized in that, The telescopic component is located in the middle of the liquid storage chamber, and the drainage tube is provided by the detection chamber and inserted into the bottom of the four corners of the liquid storage chamber; when the telescopic component expands to its maximum volume, it maintains a distance from the drainage tube; the telescopic component includes a fixed part and a movable part sealed to the fixed part, the movable part is foldable, and when the movable part is unfolded, an air chamber is formed between the movable part and the fixed part, the fixed part is connected to an air pipe for air intake or exhaust, and the air pipe is connected to the outside atmosphere; when the volume of the air chamber increases, outside air enters the air chamber; when the volume of the air chamber decreases, the gas inside the air chamber is discharged to the outside atmosphere.

5. The airtightness testing equipment for cylinder castings as described in claim 4, characterized in that, The movable part includes an external corrugated folding part and a guide frame for folding. The movable part is provided with a telescopic drive part on its side or bottom, which is adapted to drive the corrugated folding part to unfold or retract.

6. The airtightness testing equipment for cylinder block castings as described in claim 4, characterized in that, A positioning plate is provided at the bottom of the cylinder casting, and the cylinder casting is fixed on the positioning plate. The positioning plate has multiple positioning parts for limiting the position of the cylinder casting. A detection platform is formed on the middle plate. The positioning component performs positioning in the first direction, and the detection component performs detection in the second direction. The positioning parts limit the cylinder casting from sliding in the first direction.

7. The airtightness testing equipment for cylinder castings as described in claim 6, characterized in that, The detection component includes at least two detection ports, and adjacent detection ports correspond to two cylinders spaced apart on the cylinder casting.

8. The airtightness testing equipment for cylinder castings as described in claim 7, characterized in that, The cylinder casting has at least three cylinders; at least two fixed points are formed at intervals along a first direction above the testing platform, and the distance between two adjacent fixed points is the same as the distance between adjacent cylinders on the cylinder casting. When the cylinder casting is fixed at two of the fixed points respectively, the testing component performs an airtightness test on both sides.

9. The airtightness testing equipment for cylinder block castings as described in claim 8, characterized in that, The sealing assembly includes a plug that mates with a channel in the casting and a drive mechanism for moving the plug. After the casting is positioned, the drive mechanism causes the plug to mate with the casting to close the channel in the casting.

10. The airtightness testing equipment for cylinder block castings as described in claim 6, characterized in that, The positioning component further includes an abutting mechanism and a positioning mating part. After the cylinder casting is transferred to the detection platform in a set posture, the abutting mechanism pushes the cylinder casting to move and cooperates with the positioning mating part to abut against it. The positioning part, the positioning plate, the abutting mechanism and the positioning mating part together form the positioning component described above. The positioning part has at least two locations on both sides corresponding to the first direction.

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