A pull-out engine cylinder head airtightness testing device

Abstract

This utility model discloses a pull-out engine cylinder head airtightness testing device, including a base with a testing station on the base. The testing station has sealing mechanisms on its sides and top to seal the through holes of the engine cylinder head. A movable plate for placing the engine cylinder head is slidably mounted on the base, and the movable plate has positioning pins to limit the movement of the engine cylinder head. An air pipe is connected to the sealing mechanisms above to perform air inflation testing on the engine cylinder head. This utility model uses a movable plate slidably mounted on the base. When the engine cylinder head needs to be removed or placed, the movable plate can be pulled out from the testing station before removal or placement, avoiding interference from the sealing mechanisms when removing or placing the cylinder head within the testing station. Therefore, it can effectively improve the airtightness testing efficiency of the engine cylinder head.

Description

Technical Field

[0001] This utility model relates to the field of testing technology, specifically to a pull-out engine cylinder head airtightness testing device. Background Technology

[0002] The engine cylinder head is mounted on top of the engine block, sealing the cylinder from above and forming the combustion chamber. It is in constant contact with high-temperature and high-pressure combustion gases, and therefore bears a large thermal and mechanical load. The cylinder head of a water-cooled engine has a cooling water jacket inside, and the cooling water holes on the lower end face of the cylinder head are connected to the cooling water holes in the cylinder block, using circulating water to cool the high-temperature parts such as the combustion chamber.

[0003] The sealing performance of the engine cylinder head has a significant impact on the engine's technical condition. When the cylinder head is not sealed properly, it will cause air leakage from the cylinder, resulting in insufficient cylinder compression pressure, decreased temperature, and reduced air quality. Severe leakage will significantly reduce engine power and may even render the engine unable to operate. Currently, the industry commonly uses the water immersion bubble observation method for air tightness testing. This involves introducing compressed gas into the cylinder head's intake / exhaust passages, water jacket, and other cavities, then immersing the cylinder head in the radiator. The location and frequency of bubble formation are visually observed to determine the leak point.

[0004] In actual testing, to achieve simultaneous multi-channel testing (such as valve guide holes, spark plug holes, and water channel interfaces), traditional testing fixtures require multiple sealing mechanisms and air pressure interfaces to be simultaneously arranged on the top, side, and end faces of the cylinder head. This omnidirectional enclosed structure severely restricts the space for cylinder head handling, requiring operators to repeatedly adjust the cylinder head's posture to avoid the sealing mechanisms. Furthermore, the interference from the multi-directional sealing mechanisms hinders effective path planning by the robotic arm's grippers, making automated assembly line integration difficult. Therefore, the efficiency of existing technologies for engine cylinder head airtightness testing is generally low. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a pull-out engine cylinder head airtightness testing device, which solves the problem that the existing testing devices are inconvenient to pick up and put down the engine cylinder head, resulting in low airtightness testing efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pull-out engine cylinder head air tightness testing device includes a base with a testing station on the base. The testing station has sealing mechanisms on its side and top to seal the through holes of the engine cylinder head. A movable plate for placing the engine cylinder head is slidably arranged on the base, and a positioning pin for limiting the position of the engine cylinder head is provided on the movable plate. An air pipe is connected to the sealing mechanism above to perform air filling test inside the engine cylinder head.

[0008] With the above structural design, a movable plate for placing the engine cylinder head is movably mounted on the base. When the engine cylinder head needs to be removed or placed, the movable plate can be pulled out from the testing station before removal or placement, avoiding interference from the sealing mechanism when removing or placing the cylinder head within the testing station. Therefore, this pull-out structure can effectively improve the efficiency of engine cylinder head airtightness testing.

[0009] Preferably, the end of the movable plate is provided with a push-pull handle, and the movable plate on this side is also provided with a sealing mechanism to seal the engine cylinder head.

[0010] The above structural design facilitates the movement of the movable plate through the push-pull handle. At the same time, the movable plate integrates a sealing mechanism to seal the other side of the engine cylinder head, so as not to cause interference when the movable plate moves and to reserve a movement path.

[0011] Preferably, the sealing mechanism includes a side sealing mechanism disposed around the testing station and a top sealing mechanism above the testing station.

[0012] Preferably, the side sealing mechanism includes a fixed base and a sealing cylinder disposed on the fixed base, and the sealing cylinder is provided with a sealing head for sealing the through hole on the engine cylinder head.

[0013] Preferably, the top sealing mechanism includes a column mounted on a base, a connecting plate at the top of the column, a booster cylinder on the connecting plate, a drive rod of the booster cylinder passing through the connecting plate and connected to a movable plate, and a plurality of sealing blocks at the lower end of the movable plate.

[0014] Preferably, the movable plate is connected to an air pipe, and the movable plate has an air passage that communicates with the air pipe. One or more of the sealing blocks are provided with air holes that communicate with the air passage to inflate the engine cylinder head.

[0015] Preferably, the base is provided with a limiting member to limit the movement of the plate.

[0016] With the above structural design, the limiting member can limit the position of the moving plate, ensuring that the sealing mechanism can accurately complete the sealing.

[0017] Preferably, the number of positioning pins on the movable plate is two.

[0018] With the above structural design, the engine cylinder head has corresponding positioning holes, which ensures that the engine cylinder head will not shift during installation.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This utility model has a sliding plate on the base. When it is necessary to pick up or put down the engine cylinder head, the sliding plate can be pulled out from the inspection station before picking up or putting down, avoiding the interference of the sealing mechanism when picking up or putting down in the inspection station. Therefore, it can effectively improve the airtightness inspection efficiency of the engine cylinder head.

[0021] 2. The base plate of this utility model is equipped with a limiting component, which plays a precise limiting role when the moving plate moves. At the same time, two positioning pins are provided on the moving plate to install and position the engine cylinder head, which can ensure the precise cooperation between the engine cylinder head installed and sent into the testing station and the sealing mechanism, thereby improving the testing quality. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present utility model;

[0023] Figure 2 yes Figure 1 The front view in the middle;

[0024] Figure 3 yes Figure 2 Sectional view along the middle AA.

[0025] In the picture:

[0026] Base 1, slide rail 1a, side sealing mechanism 2a, fixed seat 21a, sealing cylinder 22a, sealing head 23a, limit rod 24a, top sealing mechanism 2b, column 21b, connecting plate 22b, booster cylinder 23b, drive rod 24b, movable plate 25b, sealing block 26b, moving plate 3, positioning pin 3a, push-pull handle 4, limit component 5. Detailed Implementation

[0027] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0028] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. 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. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0029] Please see Figure 1 , Figure 2 and Figure 3 A pull-out engine cylinder head airtightness testing device includes a base 1 with a testing station (not shown in the figure) on the base 1. The testing station has sealing mechanisms on its sides and top to seal the through holes of the engine cylinder head. A movable plate 3 for placing the engine cylinder head is slidably mounted on the base 1, and the movable plate 3 has positioning pins 3a to limit the position of the engine cylinder head. In this embodiment, the movable plate 3 has two positioning pins 3a to ensure accurate installation of the engine cylinder head and avoid sealing position deviations. A push-pull handle 4 is provided at the end of the movable plate 3 for easy pulling. The movable plate 3 also has a sealing mechanism to seal the engine cylinder head; this sealing mechanism moves with the movable plate 3, allowing for a pre-planned movement path. A limiting member 5 is provided on the base 1 to limit the position of the movable plate 3, ensuring accurate positioning. An air pipe is connected to the sealing mechanism above to perform air filling tests inside the engine cylinder head. The detection device of this utility model can be used in conjunction with a lifting mechanism and a water tank. The detection device is connected to the lifting mechanism. After the engine cylinder head is installed, it descends into the water tank and ventilates to observe the bubbles. The main feature of this detection device is the installation of a pull-out movable plate 3. When it is necessary to remove or place the engine cylinder head, it will not be affected by the blocking mechanism around the detection station.

[0030] In this embodiment, a slide rail 1a is provided on the base 1, and a corresponding slide groove is provided below the movable plate 3, and the movable plate 3 is slidably mounted on the slide rail 1a.

[0031] Specifically, the sealing mechanism includes a side sealing mechanism 2a disposed around the testing station and a top sealing mechanism 2b above the testing station. The configuration of the sealing mechanism depends on the specific structure of different engine cylinder heads.

[0032] Please see Figure 3 The side sealing mechanism 2a includes a fixed base 21a and a sealing cylinder 22a disposed on the fixed base 21a. The sealing cylinder 22a is provided with a sealing head 23a for sealing the through hole on the engine cylinder head. In this embodiment, depending on the size of the sealing head 23a, a larger sealing head 23a may be placed to prevent positional displacement during movement. Therefore, a limiting rod 24a can be provided to prevent the sealing head 23a from moving or flipping. One end of the limiting rod 24a is fixed to the sealing head 23a, and the other end is movably disposed on the fixed base 21a. The limiting rod 24a also serves as a guide.

[0033] Please see 1 and Figure 2, the top plugging mechanism 2b includes a column 21b disposed on the base 1. A connecting plate 22b is provided at the top of the column 21b. A boosting cylinder 23b is provided on the connecting plate 22b. A driving rod 24b of the boosting cylinder 23b passes through the connecting plate 22b and is connected to a movable plate 25b. A plurality of plugging blocks 26b are provided at the lower end of the movable plate 25b. An air pipe is connected to the movable plate 25b, and the air pipe is externally connected to a gas source. This technical feature is prior art and will not be elaborated here. An air passage is provided in the movable plate 25b and is communicated with the air pipe. One or more of the plugging blocks 26b are provided with air holes penetrating therethrough and are communicated with the air passage to inflate the inside of the engine cylinder head.

[0034] In this embodiment, both the plugging head 23a and the plugging block 26b are made of polyurethane material.

[0035] The working principle of the present utility model is as follows:

[0036] The detection device can be fixedly connected to an external lifting device and maintain the level and stability of the detection device. At the same time, it cooperates with the water tank for water detection. This detection method belongs to the prior art. When it is necessary to perform airtightness detection on the engine cylinder head of the product, first, hold the push-pull handle 4 and pull out the movable plate 3 from the detection station. Then, install the engine cylinder head to be detected on the movable plate 3, and perform positioning installation with the engine cylinder head through the positioning pin 3a on the movable plate 3 to ensure that the installation position does not deviate. After the installation is completed, push the base 1 and the engine cylinder head together along the slide rail into the detection station. Then, by controlling the plugging cylinder 22a of the side plugging mechanism 2a to work, the plugging head 23a completes the side plugging of the engine cylinder head. At the same time, the boosting cylinder 23b of the top plugging mechanism 2b works, and the plugging blocks 26b plug the top of the engine cylinder head. At the same time, the air pipe is ventilated, and the gas is injected into the inside of the engine cylinder head through the air passage in the movable plate 25b and the air holes of the plugging blocks 26b. At the same time, the detection device is lowered into the water tank through the lifting mechanism, and observe whether there are bubbles. If there are no bubbles, it proves that the product has qualified airtightness. If bubbles are generated, the detection is unqualified. After the product detection is completed, the lifting device lifts the detection device, and the plugging mechanism returns to the initial position. At this time, pulling out the movable plate 3 outward can complete the material taking.

[0037] Therefore, the detection device of the present utility model can complete the product loading and unloading outside the detection station by setting the pull-out movable plate 3, avoiding the interference of the plugging mechanism, and thus improving the detection efficiency of the product airtightness.

[0038] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A device for detecting the gas tightness of a cylinder head of a pull-type engine, characterized in that, Includes a base (1), on which a testing station is provided, and on the side and top of the testing station are sealing mechanisms to seal the through holes of the engine cylinder head. A movable plate (3) for placing the engine cylinder head is slidably provided on the base (1), and a positioning pin (3a) for limiting the engine cylinder head is provided on the movable plate (3). An air pipe is connected to the sealing mechanism above to perform air filling test inside the engine cylinder head.

2. A device for detecting the gas tightness of a cylinder head of a pull-type engine according to claim 1, characterized in that The end of the movable plate (3) is provided with a push-pull handle (4), and the movable plate (3) on this side is also provided with a sealing mechanism to seal the engine cylinder head.

3. A device for detecting the gas tightness of a cylinder head of a pull-type engine according to claim 1, wherein The sealing mechanism includes a side sealing mechanism (2a) disposed around the testing station and a top sealing mechanism (2b) above the testing station.

4. A puller-type engine head leak detection apparatus as set forth in claim 3, wherein The side sealing mechanism (2a) includes a fixed base (21a) and a sealing cylinder (22a) disposed on the fixed base (21a), and the sealing cylinder (22a) is provided with a sealing head (23a) for sealing the through hole on the engine cylinder head.

5. A puller-type cylinder head leak tester as set forth in claim 3, wherein, The top sealing mechanism (2b) includes a column (21b) mounted on a base (1), a connecting plate (22b) on the top of the column (21b), a booster cylinder (23b) on the connecting plate (22b), a drive rod (24b) of the booster cylinder (23b) passing through the connecting plate (22b) and connected to a movable plate (25b), and a plurality of sealing blocks (26b) at the lower end of the movable plate (25b).

6. A puller-type engine head leak-down tester as set forth in claim 5, wherein, The movable plate (25b) is connected to an air pipe, and the movable plate (25b) has an air passage that communicates with the air pipe. One or more of the sealing blocks (26b) are provided with air holes that communicate with the air passage to inflate the engine cylinder head.

7. The pull-out engine cylinder head airtightness testing device as described in claim 1, characterized in that, The base (1) is provided with a limiting member (5) for limiting the movement plate (3).

8. A puller-type engine cylinder head leak detection apparatus as set forth in claim 1, wherein The number of positioning pins (3a) on the movable plate (3) is 2.

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