An engine cavity pressure testing fixture

Abstract

The utility model relates to the technical field of engine manufacturing, especially a kind of engine cavity pressure test fixture, including frame, still including compacting cylinder, workpiece mounting table and sealing cylinder, wherein, compacting cylinder is fixed in the top of frame, its output end is used to resist and compact the top of the workpiece to be tested downward, and the opening in the top of the workpiece to be tested is sealed;Workpiece mounting table top is used to support the workpiece to be tested, and the opening in the bottom of the workpiece to be tested is sealed, workpiece mounting table slidingly sets in the bottom of frame, for the workpiece to be tested is moved to the below of compacting cylinder or removed from its below;Sealing cylinder is fixed in the bottom of frame, and its output end is used to block the opening in the side of the workpiece to be tested. The utility model a kind of engine cavity pressure test fixture is convenient for the loading and unloading of workpiece, effectively reduce labor intensity, not easy to cause misoperation or knock damage, it is favorable to realize efficient, safe batch testing operation.

Description

Technical Field

[0001] This utility model relates to the field of engine manufacturing technology, and in particular to an engine cavity testing fixture. Background Technology

[0002] During engine manufacturing and processing, cavity-type parts typically require cavity pressure testing to verify their sealing performance. During the pressure test, the workpiece (such as an engine block, gearbox housing, or air pipe) is fixed to the mounting platform of the pressure testing fixture, and the orifices on the workpiece communicating with its internal cavity are effectively sealed. Then, gas or liquid media is injected into the cavity to detect any leaks or structural defects.

[0003] Existing cavity testing fixtures typically employ a fixed mounting platform, positioned directly below the clamping cylinder, to support the workpiece under test and achieve clamping and positioning. For example, the utility model patent with authorization number CN218916697U discloses a dual-purpose pneumatic and air-operated testing device for automotive engine air pipes, which uses a stabilizing component to clamp and fix the workpiece under test onto the mounting platform, and uses a plugging component to seal the orifices on the workpiece.

[0004] As described above, the mounting platform of the existing cavity testing fixture cannot be moved out from under the clamping cylinder. When clamping workpieces, workers are restricted by the surrounding structure, which not only increases labor intensity but also easily causes misoperation or collision damage, which is not conducive to achieving efficient and safe batch testing operations. Utility Model Content

[0005] In view of this, the present invention proposes an engine cavity pressure testing fixture, whose workpiece mounting platform can move the workpiece to be tested under or from under the clamping cylinder to facilitate the loading and unloading of the workpiece, effectively reducing labor intensity, and preventing misoperation or collision damage. It is conducive to achieving efficient and safe batch testing operations and solves the problems of inconvenient loading and unloading, high labor intensity, easy misoperation and collision damage of existing cavity pressure testing fixtures.

[0006] The technical solution of this utility model is implemented as follows:

[0007] This utility model provides an engine cavity testing fixture, including a frame, a clamping cylinder, a workpiece mounting platform, and a sealing cylinder.

[0008] The clamping cylinder is fixed to the top of the frame, and its output end is used to press down against and clamp the top of the workpiece to be tested, and to seal the opening at the top of the workpiece to be tested.

[0009] The top of the workpiece mounting platform is used to support the workpiece to be tested and to seal the opening at the bottom of the workpiece to be tested. The workpiece mounting platform is slidably disposed at the bottom of the frame and is used to move the workpiece to be tested under or from under the clamping cylinder.

[0010] The sealing cylinder is fixed at the bottom of the frame. Its output end is used to block the opening on the side of the workpiece to be tested, and its output end is provided with an air inlet. One end of the air inlet is used to connect to the inner cavity of the workpiece, and the other end is used to connect to an external air source.

[0011] Based on the above technical solutions, preferably, the workpiece mounting table includes a translation seat, a first sealing gasket, a slider, and a slide rail, wherein,

[0012] The first sealing gasket is fixed on the support surface at the top of the translation seat, and the slider is fixed at the bottom;

[0013] The slider is slidably mounted on the slide rail, which is fixed to the bottom of the frame.

[0014] Based on the above technical solutions, preferably, the workpiece mounting table further includes a handle, wherein,

[0015] The handle is fixed to the front end of the translation seat.

[0016] Based on the above technical solutions, preferably, the workpiece mounting table further includes a workpiece limiting post and a workpiece positioning pin, wherein...

[0017] The workpiece limiting post is fixed to the rear side of the top of the translation seat and is used to abut against the rear side wall of the workpiece to be tested.

[0018] The workpiece positioning pin is fixed to the top of the translation seat and is used to insert into the positioning hole of the workpiece to be tested;

[0019] The first sealing gasket is provided with a through hole through which the workpiece limiting post and the workpiece positioning pin pass upward.

[0020] Based on the above technical solutions, preferably, the frame includes a base plate, columns, a top plate, and a cylinder mounting bracket, wherein,

[0021] The top plate is located on the rear side of the top of the bottom plate, and the two are fixedly connected by the column. The top plate is fixedly connected to the clamping cylinder.

[0022] The cylinder mounting bracket is installed below the top plate and fixed to the left side of the top of the bottom plate. The cylinder mounting bracket is fixedly connected to the sealing cylinder.

[0023] The slide rail is fixed to the right side of the top of the base plate, with its front end aligned with the front end of the base plate and its rear end aligned with the rear end of the base plate.

[0024] Based on the above technical solutions, preferably, the frame further includes a stop block, wherein,

[0025] One stopper is provided at each end of the slide rail, and the stopper is fixedly connected to the base plate.

[0026] Based on the above technical solution, preferably, a first pressure plate is fixed on the output end of the clamping cylinder, wherein...

[0027] A second sealing gasket is fixed on the end of the first pressure plate away from the clamping cylinder.

[0028] Based on the above technical solution, preferably, a second pressure plate is fixed on the output end of the sealing cylinder, wherein...

[0029] A third sealing gasket is fixed on the end of the second pressure plate away from the sealing cylinder;

[0030] The second pressure plate has a first air inlet hole arranged radially and a second air inlet hole arranged axially.

[0031] The third sealing gasket is provided with a third air inlet along the axial direction;

[0032] The first air inlet, the second air inlet, and the third air inlet are connected in sequence to form the inflation port.

[0033] Based on the above technical solutions, preferably, an air line connector is fixed on one end of the air inlet.

[0034] Based on the above technical solution, preferably, at least two sealing cylinders are arranged along the front-to-back direction, wherein,

[0035] A T-junction is fixed to the air port of the sealing cylinder on the rear side;

[0036] One end of the three-way valve is connected to an external air source, and the other end is connected to the air port of the sealing cylinder on the front side.

[0037] The inflation port is located on the output end of one of the sealing cylinders.

[0038] The engine cavity pressure testing fixture of this utility model has the following advantages over the prior art:

[0039] (1) By setting a sliding workpiece mounting platform, the workpiece to be tested can be moved to the bottom of the clamping cylinder or moved out from the bottom of it, which improves the workpiece loading and unloading operation space, effectively reduces labor intensity, avoids misoperation and collision damage, and is conducive to achieving efficient and safe batch testing operations.

[0040] (2) By setting a first sealing gasket on the top of the workpiece mounting table and a second sealing gasket at the output end of the clamping cylinder, the upper and lower sealing structures can buffer and protect the end face of the workpiece during the clamping process, reduce the risk of damage, improve the sealing performance, prevent leakage during the pressure test, and improve the test accuracy.

[0041] (3) By setting workpiece limiting posts and workpiece positioning pins, the rear side wall of the workpiece is limited and the workpiece positioning hole is matched to achieve rapid positioning, which improves the workpiece clamping efficiency and positioning accuracy, and further improves the testing efficiency.

[0042] (4) By setting a T-junction on the air port of the rear sealing cylinder, one end of the T-junction is connected to the external air source and the other end is connected to the air port of the front sealing cylinder, so as to realize the air circuit of the two sealing cylinders in series, effectively reducing the length of the external air line, simplifying the air circuit structure, improving the safety of the working area, avoiding the risk of people tripping due to excessively long air lines, and also improving the overall neatness and aesthetics of the equipment. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a perspective view of an engine cavity pressure testing fixture according to the present invention;

[0045] Figure 2 This is a perspective view of an engine cavity pressure testing fixture according to the present invention.

[0046] Figure 3 A 3D view of the workpiece mounting platform;

[0047] Figure 4 A 3D view of the sealing cylinder area;

[0048] Figure 5 This is a partial perspective view of an engine cavity testing fixture of the present invention in use.

[0049] In the diagram: 1. Frame; 2. Clamping cylinder; 3. Workpiece mounting platform; 4. Sealing cylinder; 11. Base plate; 12. Column; 13. Top plate; 14. Cylinder mounting bracket; 15. Stop block; 21. First pressure plate; 22. Second sealing gasket; 31. Translation seat; 32. First sealing gasket; 33. Slider; 34. Slide rail; 35. Handle; 36. Workpiece limiting post; 37. Workpiece positioning pin; 41. Second pressure plate; 42. Third sealing gasket; 43. Air line connector; 44. T-junction; 401. Inflation hole; 4101. First air inlet; 4102. Second air inlet; 4201. Third air inlet. Detailed Implementation

[0050] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0051] like Figure 1-5 As shown, the present invention provides an engine cavity pressure test fixture, which includes a frame 1, a clamping cylinder 2, a workpiece mounting platform 3, and a sealing cylinder 4, for sealing the workpiece to be tested and applying pressure to complete the airtightness test.

[0052] The clamping cylinder 2 is fixed to the top of the frame 1. Its output end is used to press down on and clamp the top of the workpiece to be tested, and to seal the opening at the top of the workpiece. The workpiece mounting platform 3 supports the workpiece to be tested at the top and seals the opening at the bottom of the workpiece. The workpiece mounting platform 3 is slidably set at the bottom of the frame 1, and is used to move the workpiece to be tested under the clamping cylinder 2 or remove it from under the clamping cylinder 2. The sealing cylinder 4 is fixed to the bottom of the frame 1. Its output end is used to block the opening on the side of the workpiece to be tested, and its output end is provided with an inflation hole 401. One end of the inflation hole 401 is used to connect to the inner cavity of the workpiece, and the other end is used to connect to an external air source.

[0053] This structure allows the workpiece mounting platform 3 to move the workpiece to be tested under or from under the clamping cylinder 2, improving the workpiece loading and unloading operation space, effectively reducing labor intensity, avoiding misoperation and collision damage, and facilitating efficient and safe batch testing operations.

[0054] In the above-mentioned cavity testing fixture, the workpiece mounting platform 3 includes a translation seat 31, a first sealing gasket 32, a slider 33, a slide rail 34, a handle 35, a workpiece limiting post 36, and a workpiece positioning pin 37.

[0055] The translation seat 31 has a first sealing gasket 32 ​​fixed on its top support surface to support the workpiece and seal its bottom opening. A slider 33 is fixed to the bottom of the translation seat 31, and the slider 33 slides in conjunction with a slide rail 34 fixed to the bottom of the frame 1, enabling the workpiece mounting platform 3 to move in the front-back direction. A handle 35 is fixed to the front end of the translation seat 31 to facilitate manual operation of the workpiece mounting platform 3 to slide back and forth, improving loading and unloading efficiency.

[0056] The workpiece limiting post 36 is fixed to the rear side of the top of the translation seat 31 to abut against the rear sidewall of the workpiece to be tested, thereby limiting its position. The workpiece positioning pin 37 is fixed to the top of the translation seat 31 and is inserted into the positioning hole of the workpiece to be tested (the positioning hole is a pre-made hole on the workpiece) to achieve positioning. The first sealing gasket 32 ​​is provided with a through hole through which the workpiece limiting post 36 and the workpiece positioning pin 37 pass upward.

[0057] In this structure, the first sealing gasket 32 ​​acts as a buffer during clamping, effectively reducing damage to the bottom of the workpiece, while simultaneously achieving a complete seal on the bottom opening, thus improving airtightness. The workpiece limiting post 36 and the workpiece positioning pin 37 work together to ensure accurate workpiece positioning and quick clamping, further improving testing efficiency and operational reliability.

[0058] In the aforementioned cavity testing fixture, frame 1 includes a base plate 11, columns 12, a top plate 13, and a cylinder mounting bracket 14. The top plate 13 is located on the rear side of the top of the base plate 11 and is fixedly connected to the base plate 11 via four matrix-distributed columns 12, serving to support and fix the clamping cylinder 2. The cylinder mounting bracket 14 is located below the top plate 13 and fixed to the top left side of the base plate 11, serving to horizontally mount the sealing cylinder 4.

[0059] In this structure, the slide rail 34 is fixed to the top right side of the base plate 11, with its front end aligned with the front end of the base plate 11 and its rear end aligned with the rear end of the base plate 11, so that the front half of the slide rail 34 is in a forward-extending state, ensuring that the workpiece mounting table 3 can completely move the workpiece out from under the clamping cylinder 2, increasing the workpiece loading and unloading operation space and facilitating loading and unloading.

[0060] Furthermore, the front half of the slide rail 34 extends forward, allowing the workpiece mounting platform 3 to carry the workpiece completely out from under the top plate 13, thus providing a larger operating space for workpiece loading and unloading and making loading and unloading more convenient.

[0061] To prevent the workpiece mounting platform 3 from derailing during forward and backward translation, a stop block 15 is installed at both ends of the slide rail 34. The stop block 15 is fixedly connected to the base plate 11 and is used to limit the sliding range of the slider 33 to prevent it from derailing during movement, thereby improving the safety and stability of the fixture operation.

[0062] In the above-mentioned cavity testing fixture, a first pressure plate 21 is fixed on the output end of the clamping cylinder 2, wherein a second sealing gasket 22 is fixed on the end of the first pressure plate 21 away from the clamping cylinder 2.

[0063] In this structure, the second sealing gasket 22 contacts the top of the workpiece during the compression process, acting as a buffer and protecting it, effectively preventing damage to the workpiece surface. Simultaneously, the second sealing gasket 22 provides a full-coverage seal to the opening at the top of the workpiece, significantly improving sealing performance and preventing gas leakage during the pressure test, thereby enhancing test accuracy and reliability.

[0064] In the above-mentioned cavity testing fixture, a second pressure plate 41 is fixed on the output end of the sealing cylinder 4, and a third sealing gasket 42 is fixed on the end of the second pressure plate 41 away from the sealing cylinder 4.

[0065] The second pressure plate 41 has a first air inlet 4101 arranged radially and a second air inlet 4102 arranged axially. The third sealing gasket 42 has a third air inlet 4201 arranged axially. The first air inlet 4101, the second air inlet 4102 and the third air inlet 4201 are connected in sequence to form a complete air filling hole 401, which is used to fill the inner cavity of the workpiece with test gas.

[0066] An air line connector 43 is fixed on one end of the air line connected to the air inlet 401, which facilitates quick connection to an external air source, improves operational convenience, and ensures stable and reliable air line connection, thereby improving testing efficiency and safety.

[0067] In the aforementioned cavity pressure testing fixture, at least two sealing cylinders 4 are arranged along the front-to-back direction. A tee 44 is fixed to the air port of the rear sealing cylinder 4. One end of the tee 44 is connected to an external air source, and the other end is connected to the air port of the front sealing cylinder 4. An inflation port 401 is located on the output end of one of the sealing cylinders 4.

[0068] In this mechanism, the air passages between the front and rear sealing cylinders 4 are connected in series via a three-way valve 44, effectively reducing the number of external air lines, avoiding safety hazards caused by excessively long air lines, improving the overall neatness and operational safety of the equipment, and simplifying the air passage layout for easier maintenance and use. The air ports on the sealing cylinder 4 include an inlet and an outlet, such as... Figure 4 As shown, the air inlets of the two sealing cylinders 4 are connected to one path, and the air outlets are connected to the other path.

[0069] It should be noted that the above-mentioned cavity pressure testing fixture is suitable for pressure testing of cavities with two openings on the side and one opening each at the top and bottom. For example... Figure 5 As shown, the workpiece to be tested has two openings on its side that communicate with the inner cavity, and one opening each at the top and bottom. Therefore, these four openings need to be sealed during the test.

[0070] During the test, connect an external gas source through the gas line joint 43, inject compressed air into the inner cavity of the workpiece, then immerse the fixture and the workpiece as a whole in water, and observe whether bubbles are generated. If no bubbles emerge, it is determined that the sealing performance of the workpiece is qualified. If bubbles emerge, it indicates that there is leakage and the workpiece is unqualified. The gas source is a common gas supply device in the prior art, such as an air compressor station, a portable air pump or a manual air pump, etc., which can be flexibly selected according to the actual use environment.

[0071] In practical applications, when the side of the workpiece to be tested has three or more interconnected openings, the number of sealing cylinders 4 and their layout on the frame 1 can be adjusted accordingly according to the number and position of the openings to meet the sealing and testing requirements of workpieces with different structures and models, thereby improving the versatility and adaptability of the fixture.

[0072] The usage method of a pressure test fixture for an engine cavity of the present utility model is as follows:

[0073] First, connect the gas line joint 43 on the air inlet hole 401 to an external gas source. Then, place the workpiece to be tested on the slidable workpiece mounting table 3. By pushing the handle 35, move the workpiece together with the workpiece mounting table 3 directly below the pressing cylinder 2. Next, start the pressing cylinder 2, and let its output end press down to drive the second sealing pad 22 to press tightly against the top opening of the workpiece. Then, start the sealing cylinder 4 to make the third sealing pad 42 block the side opening of the workpiece, achieving the sealing of each opening of the workpiece. After the sealing is completed, immerse the fixture and the workpiece as a whole in water, inject compressed air into the inner cavity of the workpiece through the gas source, and observe whether bubbles are generated. If no bubbles emerge, it means that the sealing performance of the workpiece is good and it is determined to be qualified. If bubbles emerge, it indicates that there is leakage and it is determined to be unqualified.

[0074] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An engine cavity pressure testing jig comprising a frame (1), characterised in that: It also includes a clamping cylinder (2), a workpiece mounting table (3), and a sealing cylinder (4), wherein, The clamping cylinder (2) is fixed to the top of the frame (1), and its output end is used to press down on the top of the workpiece to be tested and seal the opening at the top of the workpiece to be tested. The top of the workpiece mounting platform (3) is used to support the workpiece to be tested and to seal the opening at the bottom of the workpiece to be tested. The workpiece mounting platform (3) is slidably set at the bottom of the frame (1) to move the workpiece to be tested under the clamping cylinder (2) or remove it from under it. The sealing cylinder (4) is fixed at the bottom of the frame (1). Its output end is used to block the opening on the side of the workpiece to be tested, and its output end is provided with an air inlet (401). One end of the air inlet (401) is used to connect to the inner cavity of the workpiece, and the other end is used to connect to an external air source.

2. An engine cavity pressure testing fixture as in claim 1, wherein: The workpiece mounting platform (3) includes a translation seat (31), a first sealing gasket (32), a slider (33), and a slide rail (34), wherein, The first sealing gasket (32) is fixed on the support surface at the top of the translation seat (31), and the slider (33) is fixed at the bottom. The slider (33) is slidably mounted on the slide rail (34), which is fixed to the bottom of the frame (1).

3. An engine cavity pressure testing fixture as claimed in claim 2, wherein: The workpiece mounting table (3) also includes a handle (35), wherein, The handle (35) is fixed to the front end of the translation seat (31).

4. An engine cavity pressure testing fixture as in claim 2, wherein: The workpiece mounting table (3) also includes a workpiece limiting post (36) and a workpiece positioning pin (37), wherein, The workpiece limiting post (36) is fixed to the rear side of the top of the translation seat (31) and is used to abut against the rear side wall of the workpiece to be tested. The workpiece positioning pin (37) is fixed to the top of the translation seat (31) and is used to insert into the positioning hole of the workpiece to be tested; The first sealing gasket (32) is provided with a through hole through which the workpiece limiting post (36) and the workpiece positioning pin (37) pass upward.

5. An engine cavity pressure testing fixture as claimed in claim 2, wherein: The frame (1) includes a base plate (11), columns (12), a top plate (13), and a cylinder mounting bracket (14), wherein, The top plate (13) is located on the rear side of the top of the bottom plate (11), and the two are fixedly connected by the column (12). The top plate (13) is fixedly connected to the pressing cylinder (2). The cylinder mounting bracket (14) is located below the top plate (13) and fixed on the left side of the top of the bottom plate (11). The cylinder mounting bracket (14) is fixedly connected to the sealing cylinder (4). The slide rail (34) is fixed to the right side of the top of the base plate (11), with its front end aligned with the front end of the base plate (11) and its rear end aligned with the rear end of the base plate (11).

6. An engine cavity pressure testing fixture as claimed in claim 5, wherein: The frame (1) also includes a stop (15), wherein, One stop (15) is provided at each end of the slide rail (34), and the stop (15) is fixedly connected to the base plate (11).

7. An engine cavity pressure testing fixture as in claim 1, wherein: A first pressure plate (21) is fixed on the output end of the clamping cylinder (2), wherein, A second sealing gasket (22) is fixed on the end of the first pressure plate (21) away from the pressure cylinder (2).

8. An engine cavity pressure testing fixture as in claim 1, wherein: A second pressure plate (41) is fixed on the output end of the sealing cylinder (4), wherein... A third sealing gasket (42) is fixed on the end of the second pressure plate (41) away from the sealing cylinder (4); The second pressure plate (41) is provided with a first air inlet (4101) in the radial direction and a second air inlet (4102) in the axial direction. The third sealing gasket (42) is provided with a third air inlet (4201) along the axial direction. The first air inlet (4101), the second air inlet (4102) and the third air inlet (4201) are connected in sequence to form the inflation hole (401).

9. The engine cavity pressure testing fixture as described in claim 1, characterized in that: An air line connector (43) is fixed to one end of the air inlet (401).

10. The engine cavity pressure testing fixture as described in claim 1, characterized in that: At least two sealing cylinders (4) are arranged along the front-to-back direction, wherein, A three-way valve (44) is fixed on the air port of the sealing cylinder (4) on the rear side. One end of the three-way valve (44) is connected to an external air source, and the other end is connected to the air port of the sealing cylinder (4) on the front side; The inflation port (401) is located on the output end of one of the sealing cylinders (4).

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