Leak testing machine sealing tool with adjustable blocking rod

Abstract

The utility model discloses a leak hunting machine sealing tool with adjustable plugging rod relates to crankcase leak hunting test field, include: leak hunting machine bottom plate, the leak hunting machine bottom plate is opened with a plurality of countersunk hole, the countersunk hole inside is opened with the positioning hole, the positioning hole inside inserts with magnet piece, plugging mechanism, the plugging mechanism includes the thread sleeve, the thread sleeve outside is provided with the non -skid pad, the thread sleeve one end swing joint has the bolt no.

Description

Technical Field

[0001] This utility model relates to crankcase leak testing technology, specifically to a leak testing machine sealing fixture with an adjustable sealing rod. Background Technology

[0002] In modern internal combustion engine manufacturing, the crankcase, as one of the core structural components of the engine, plays a crucial role in supporting the crankshaft, containing lubricating oil, and forming the main frame of the engine. Its complex structure typically consists of an upper crankcase and cylinder block cast as a single piece, with a separate oil pan at the bottom for storing lubricating oil and sealing the internal space of the crankcase. Because the crankcase needs to maintain a certain sealed environment to ensure the normal operation of the lubrication system, prevent oil leakage, and avoid the intrusion of external impurities, a rigorous airtightness test, or leak test, must be conducted on the crankcase during the manufacturing process. This test is a key process for ensuring the overall quality and reliability of the engine, directly affecting the engine's durability, emissions performance, and the safe operation of the entire vehicle.

[0003] Currently, the industry commonly uses pneumatic or differential pressure leak testing machines to test the sealing performance of crankcases. The basic principle is to temporarily seal multiple potential leakage channels in the crankcase, such as vents, threaded holes, and process holes. Then, compressed air at a certain pressure is injected into the crankcase, and leaks are determined by monitoring pressure changes or flow differences. The reliability of the sealing process directly determines the accuracy of the entire test. If the sealing is inadequate, a "false leak" may occur, causing qualified products to be mistakenly judged as unqualified, resulting in unnecessary rework or even scrapping. Conversely, if the sealing device has flaws... Design defects or insufficient adaptability may also lead to leaks not being effectively sealed, allowing defective products to flow into the next process and creating potential quality problems. While crankcases were highly applicable in the early production of single-model, relatively simple crankcases, with the rapid development of the automotive industry and continuous updates to engine models, new crankcases exhibit a trend towards diversified and complex structural designs. For example, to improve engine rigidity, optimize lubrication system layout, or meet lightweight requirements, new models often add multiple new sealing surfaces to the crankcase, and these sealing holes are distributed on planes at different heights and angles. There are even tilted or irregularly shaped holes. Furthermore, some high-end engines employ modular designs, making the connection interface between the crankcase and oil pan more complex, resulting in a more compact spatial layout for the sealing area. Faced with these diverse sealing requirements across multiple models, planes, and heights, traditional fixed sealing fixtures are insufficiently adaptable. First, because the length of the sealing rod is fixed and its extension cannot be adjusted, when facing sealing holes of different heights, it either fails to fully contact the sealing surface, resulting in incomplete sealing, or excessive compression causes deformation and cracking of the sealing material, affecting the sealing effect or even damaging the workpiece. Second, multiple sealing points are not... When operating on the same plane, traditional tooling struggles to achieve synchronous and uniform sealing pressure distribution, potentially leading to leaks in some areas and severely impacting the accuracy of test results. Existing leak testing machines lack versatility when dealing with different crankcase models. As engine models continue to increase, the variety of crankcases also grows. Each crankcase model has its unique sealing hole layout and dimensions. Existing leak testing machines can only be designed and manufactured for specific crankcase models. When producing different crankcase models, the sealing device of the leak testing machine needs to be redesigned and replaced, which not only increases production costs but also extends the production cycle. Utility Model Content

[0004] The purpose of this invention is to provide a sealing fixture for a leak tester with an adjustable sealing rod, so as to solve the problem that existing leak testers cannot be adapted to different models of crankcases.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a leak testing machine sealing fixture with an adjustable sealing rod, comprising:

[0006] The base plate of the leak testing machine has several countersunk holes, and a positioning hole is formed inside the countersunk hole. A magnet is embedded inside the positioning hole.

[0007] A sealing mechanism includes a threaded sleeve with an anti-slip pad on its outer side. A first bolt is movably connected to one end of the threaded sleeve, and a screw head is fixedly installed at the end of the first bolt. A support rod is movably connected to one end of the threaded sleeve, and a second bolt is fixedly installed at one end of the support rod. The second bolt is movably connected to the threaded sleeve, and the screw head is inserted into a positioning hole. Sealing silicone is movably installed at one end of the support rod.

[0008] Furthermore, the No. 1 bolt is threadedly engaged with the internal thread of the threaded sleeve, the screw head is located at the end of the No. 1 bolt away from the threaded sleeve, the screw head slides against the inner wall of the positioning hole, the threaded sleeve is inserted into the countersunk hole, and the magnet is attracted and connected to the screw head.

[0009] Furthermore, the support rod is located at the end of the threaded sleeve away from the first bolt, and the second bolt is located at the end of the support rod near the threaded sleeve. The second bolt engages with the internal thread of the threaded sleeve, and a lock nut is installed on the outer thread of the second bolt.

[0010] Furthermore, the sealing silicone is disposed at the end of the support rod away from the No. 2 bolt, and an installation hole is opened on the side of the support rod near the sealing silicone. The sealing silicone is inserted into the installation hole and adheres to the inner wall of the installation hole.

[0011] Furthermore, a locking hole is provided on one side of the sealing silicone, and a locking bolt is threadedly installed on the side of the support rod near the mounting hole. The locking bolt is inserted into the locking hole and fits against the inner wall of the locking hole.

[0012] Furthermore, the sealing silicone is used to abut against the sealing hole, and the locking nut is used to restrict the threaded sleeve.

[0013] Compared with existing technologies, the leak tester sealing fixture with adjustable sealing rod provided by this utility model achieves flexible adjustment of the support rod height through the design of threaded sleeve, No. 2 bolt and support rod. The operator only needs to hold the threaded sleeve and rotate the support rod, and the support rod will move up and down along the threaded sleeve under the action of No. 2 bolt. By precisely controlling the rotation angle and number of turns of the support rod, the sealing silicone can be adjusted to a height that is completely in contact with the crankcase sealing surface, thereby achieving a tight seal. Whether it is a high sealing surface or a low sealing surface, the fixture of this application can easily handle it without the need to replace the sealing rod of different specifications or make large-scale modifications to the leak tester.

[0014] This application takes into account that the size and shape of the crankcase sealing holes vary greatly depending on the engine model and design requirements. Some sealing holes may be large and circular, while others may be small and irregular in shape. Traditional leak tester sealing rods typically use fixed sealing materials and shapes, which are difficult to meet the sealing requirements of different sealing holes. When the sealing rod does not match the sealing hole, a poor seal will occur, leading to errors in the leak test results, or even failing to detect the actual leak. This application, by setting mounting holes and locking bolts at the end of the support rod, enables quick removal and removal of the sealing silicone. For easy removal and replacement, operators can select the appropriate sealing silicone based on the specific size and shape of the crankcase sealing hole. The sealing silicone is usually made of a soft and highly elastic material, which can tightly fit sealing holes of different shapes to form a reliable seal. The replaceable design of the sealing silicone also extends the service life of the tooling. Since different models of crankcase sealing holes have different degrees of wear on the sealing silicone, when a sealing silicone wears or is damaged due to long-term use, the operator only needs to replace it with a new sealing silicone, without having to replace the entire tooling or sealing rod, thus reducing the cost of use.

[0015] The composite structure of magnetic positioning and mechanical limiting significantly improves the stability and convenience of tooling installation. Countersunk holes and polygonal positioning holes are set on the base plate of the leak tester, and magnetic pieces are embedded therein. These, together with the screw head, form a double fixation of mechanical and magnetic forces. When the tooling is inserted into the base plate, the magnetic pieces automatically attract the screw head, achieving preliminary positioning and pre-fixation, preventing the tooling from falling or shaking before it is locked. This composite positioning method ensures both quick installation (one-plug-and-hold) and long-term reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0018] Figure 2 A schematic diagram of the positioning hole structure provided in an embodiment of this utility model;

[0019] Figure 3 A schematic diagram of the support rod structure provided in an embodiment of this utility model;

[0020] Figure 4 This is a schematic diagram of the sealing silicone installation structure provided in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Leak testing machine base plate; 11. Countersunk hole; 12. Positioning hole; 13. Magnetic piece; 2. Sealing mechanism; 21. Threaded sleeve; 22. Anti-slip pad; 23. Bolt No. 1; 24. Screw head; 25. Support rod; 26. Bolt No. 2; 27. Locking nut; 28. Sealing silicone; 29. ​​Mounting hole; 210. Locking hole; 211. Locking bolt. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] As attached Figure 1 To be continued Figure 4 As shown:

[0025] Example 1:

[0026] This utility model provides a sealing fixture for a leak testing machine with an adjustable sealing rod, comprising:

[0027] The base plate 1 of the leak testing machine has several countersunk holes 11, and a positioning hole 12 is provided inside the countersunk hole 11. A magnetic piece 13 is embedded inside the positioning hole 12.

[0028] The sealing mechanism 2 includes a threaded sleeve 21, with an anti-slip pad 22 on the outside of the threaded sleeve 21. One end of the threaded sleeve 21 is movably connected to a bolt 23, and a screw head 24 is fixedly installed at the end of the bolt 23. One end of the threaded sleeve 21 is movably connected to a support rod 25, and a bolt 26 is fixedly installed at one end of the support rod 25. The bolt 26 is movably connected to the threaded sleeve 21. The screw head 24 is inserted into the positioning hole 12. A sealing silicone 28 is movably installed at one end of the support rod 25.

[0029] Specifically, bolt 23 engages with the internal thread of threaded sleeve 21. Screw head 24 is positioned at the end of bolt 23 furthest from threaded sleeve 21, slidingly fitting against the inner wall of positioning hole 12. Threaded sleeve 21 is inserted into countersunk hole 11. Magnet 13 is attracted to screw head 24. Support rod 25 is positioned at the end of threaded sleeve 21 furthest from bolt 23. Bolt 26 is positioned at the end of support rod 25 closest to threaded sleeve 21, engaging with the internal thread of threaded sleeve 21. Locking nut 27 is installed on the outer thread of bolt 26. Sealing silicone 2... 8 is located at the end of the support rod 25 away from the second bolt 26. The support rod 25 has an installation hole 29 on the side near the sealing silicone 28. The sealing silicone 28 is inserted into the installation hole 29 and fits against the inner wall of the installation hole 29. A locking hole 210 is provided on one side of the sealing silicone 28. A locking bolt 211 is threadedly installed on the side of the support rod 25 near the installation hole 29. The locking bolt 211 is inserted into the locking hole 210 and fits against the inner wall of the locking hole 210. The sealing silicone 28 is used to abut against the sealing hole. The locking nut 27 is used to restrict the threaded sleeve 21.

[0030] As can be seen from the above, countersunk holes 11 and positioning holes 12 are pre-drilled on the base plate 1 of the leak testing machine according to the number of holes to be sealed, for the installation of this device. A magnet 13 is embedded inside the positioning hole 12. The positioning hole 12 has edges, and its size and shape match the screw head 24 to limit the screw head 24. The magnet 13 can generate magnetic attraction force on the screw head 24 to achieve pre-fixation and stable suspension of the tooling. The first bolt 23 is threadedly engaged with the threaded sleeve 21. Rotating the first bolt 23 can adjust the distance between the screw head 24 and the threaded sleeve 21. Similarly, the second bolt 26 is threadedly engaged with the other end of the threaded sleeve 21. Rotating the support rod 25 can adjust the distance between it and the threaded sleeve 21. An anti-slip pad 22 is provided on the outside of the threaded sleeve 21 for the convenience of the operator. The operator holds the locking nut 27, which is threadedly matched with the second bolt 26, and abuts against the threaded sleeve 21 to prevent the threaded sleeve 21 from moving downward, thereby fixing the height of the support rod 25 and ensuring the stability and sealing of the plug. The sealing silicone 28 is a cylindrical elastomer that is inserted into the mounting hole 29 of the support rod 25. Its end face is arc-shaped or flat and is used to press and seal the plugging hole of the crankcase. The sealing silicone 28 has a locking hole 210 on its side. After the sealing silicone 28 is inserted into the mounting hole 29, the locking bolt 211 on the side is screwed into the support rod 25. The locking bolt 211 is inserted into the locking hole 210 of the sealing silicone 28, which realizes the disassembly, replacement and installation of the sealing silicone 28. It is convenient to replace the appropriate sealing silicone 28 according to the size and shape of the plugging hole of different crankcases.

[0031] Working principle: First, screw the No. 1 bolt 23 into the top of the threaded sleeve 21, then screw the No. 2 bolt 26 into the other end of the threaded sleeve 21, and install the sealing silicone 28. Insert the screw head 24 into the positioning hole 12 of the leak tester base plate 1. The edge of the screw head 24 fits into the positioning hole 12, and the positioning hole 12 limits the screw head 24. At the same time, the threaded sleeve 21 is inserted into the countersunk hole 11. The threaded sleeve 21 cannot be rotated. The magnet 13 makes the overall structure more stable and hangs below the leak tester base plate 1. Hold the threaded sleeve 21 and rotate the support rod 25. The support rod 25 gradually moves down under the action of the No. 2 bolt 26 until the sealing silicone 28 at the bottom is tightly against the sealing hole of the crankcase, sealing the sealing hole. Tighten the locking nut 27 so that the locking nut 27 abuts against the bottom of the threaded sleeve 21 to prevent the threaded sleeve 21 from moving down, thereby fixing the height of the support rod 25 and ensuring the stability and sealing of the sealing.

[0032] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A leak testing machine sealing fixture with an adjustable sealing rod, characterized in that, include: The base plate (1) of the leak testing machine is provided with several countersunk holes (11), and a positioning hole (12) is provided inside the countersunk hole (11). A magnet (13) is embedded inside the positioning hole (12). The sealing mechanism (2) includes a threaded sleeve (21), an anti-slip pad (22) is provided on the outside of the threaded sleeve (21), a first bolt (23) is movably connected to one end of the threaded sleeve (21), a screw head (24) is fixedly installed at the end of the first bolt (23), a support rod (25) is movably connected to one end of the threaded sleeve (21), a second bolt (26) is fixedly installed at one end of the support rod (25), the second bolt (26) is movably connected to the threaded sleeve (21), the screw head (24) is inserted into the positioning hole (12), and a sealing silicone (28) is movably installed at one end of the support rod (25).

2. The leak tester sealing fixture with adjustable sealing rod according to claim 1, characterized in that, The first bolt (23) is threadedly engaged with the threaded sleeve (21). The screw head (24) is located at the end of the first bolt (23) away from the threaded sleeve (21). The screw head (24) slides against the inner wall of the positioning hole (12). The threaded sleeve (21) is inserted into the countersunk hole (11). The magnet (13) is attracted to the screw head (24).

3. The leak testing machine sealing fixture with adjustable sealing rod according to claim 1, characterized in that, The support rod (25) is located at the end of the threaded sleeve (21) away from the first bolt (23), and the second bolt (26) is located at the end of the support rod (25) close to the threaded sleeve (21). The second bolt (26) is threadedly engaged with the inside of the threaded sleeve (21), and a locking nut (27) is installed on the outside thread of the second bolt (26).

4. The leak testing machine sealing fixture with adjustable sealing rod according to claim 1, characterized in that, The sealing silicone (28) is located at the end of the support rod (25) away from the second bolt (26). The support rod (25) has an installation hole (29) on the side near the sealing silicone (28). The sealing silicone (28) is inserted into the installation hole (29) and the sealing silicone (28) fits against the inner wall of the installation hole (29).

5. The leak tester sealing fixture with adjustable sealing rod according to claim 4, characterized in that, The sealing silicone (28) has a locking hole (210) on one side. The support rod (25) has a locking bolt (211) threaded on the side near the mounting hole (29). The locking bolt (211) is inserted into the locking hole (210) and fits against the inner wall of the locking hole (210).

6. The leak tester sealing fixture with adjustable sealing rod according to claim 3, characterized in that, The sealing silicone (28) is used to abut against the sealing hole, and the locking nut (27) is used to restrict the threaded sleeve (21).

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