Airtight detection tool for efficiently measuring sealing effect of end face of small tube

Abstract

This utility model discloses a high-efficiency airtightness testing fixture for measuring the sealing effect of the end face of small tubes, belonging to the technical field of airtightness testing equipment. The fixture includes a mounting plate, a small tube positioning block, a guide post, an air source fixing plate, a pressing handle, and a sealing gas plate. The air source fixing plate is fixed to the mounting plate, and the sealing gas plate is disposed on the air source fixing plate and embedded with an elastic sealing ring; the guide post is vertically fixed to the inner side of the air source fixing plate, and the small tube positioning block is slidably fitted onto the guide post, with a slot at its top for accommodating the small tube; the pressing handle is hinged to the mounting plate and linked to the small tube positioning block through a lever structure. This utility model utilizes the lever principle to drive the positioning block to move along the guide post by pressing down or lifting the handle, achieving the pressing and separation of the small tube end face from the sealing gas plate, thus completing the airtightness test. This fixture has advantages such as labor-saving operation, high efficiency, strong adaptability, and good sealing effect, and is suitable for batch end face sealing testing of small tube parts.

Description

Technical Field

[0001] This utility model relates to the technical field of airtightness testing equipment, specifically to an airtightness testing fixture for efficiently measuring the sealing effect of the end face of small tubes. Background Technology

[0002] In numerous industrial sectors, including machinery manufacturing, medical devices, automotive engineering, refrigeration and air conditioning systems, and precision instruments, a large number of small tubular components made of various metals or non-metals are used, such as capillary tubes, microchannel tubes, hydraulic oil lines, fuel lines, and sensor pressure guide tubes. These components share the common characteristic of having a small outer diameter, typically between 4mm and 12mm, and require extremely stringent sealing performance at their end-face connections. The quality of the seal directly affects the overall system's efficiency, safety, reliability, and lifespan. Therefore, rapid and accurate airtightness testing of the end faces of these small tubular components during manufacturing or maintenance is a crucial step in ensuring product quality.

[0003] Currently, in industrial settings, traditional and relatively primitive methods are still widely used for airtightness testing of the ends of small pipes. The most typical example is the "water test method"—the operator first forcibly attaches a section of rubber hose to the end of the metal pipe being tested, then uses metal clamps or cable ties to tighten the connection, attempting to create a temporary seal. Subsequently, the assembled test piece is immersed in a water tank, and gas at a certain pressure is introduced into the pipeline. Finally, the operator visually observes whether bubbles escape from the water to determine if a leak exists and its approximate location. However, this method suffers from low detection efficiency, poor adaptability, accuracy greatly affected by operator input, and ergonomic issues, failing to meet the demands of high-efficiency, high-precision production. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, this utility model aims to provide an airtightness testing fixture for the end face sealing effect of small tubes that has high testing efficiency, good adaptability, simple operation and high accuracy.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-efficiency airtightness testing fixture for measuring the end-face sealing effect of small tubes includes a mounting plate, a tube positioning block, a guide post, an air source fixing plate, a pressing handle, and a sealing air plate. The mounting plate is a basic load-bearing structure, and the air source fixing plate is fixedly mounted on the mounting plate. The sealing air plate is fixedly disposed on the air source fixing plate, with its inner end for contacting the end face of the tube and its outer end having an interface for communicating with the air source. The guide post is vertically fixed on the inner side of the air source fixing plate. The tube positioning block is slidably fitted onto the guide post, and the top of the tube positioning block has a slot for accommodating the tube. The middle part of the pressing handle is hinged to the bottom of the mounting plate via a pivot, and its power arm end is connected to the tube positioning block via a connecting rod. The pressing handle rotates around its hinge axis, driving the tube positioning block to move linearly along the guide post.

[0007] Preferably, the inner end face of the sealing gas disc is provided with an annular sealing groove, and a sealing ring made of elastic sealing material is embedded in the annular sealing groove to adapt to the ends of thin pipes of different diameters.

[0008] Preferably, the slot at the top of the thin tube positioning block is a V-shaped slot.

[0009] Preferably, the height of the thin tube positioning block is configured such that when the thin tube positioning block moves along the guide post to the position closest to the sealing gas plate, the end face of the thin tube forms a sealing contact with the sealing ring.

[0010] Preferably, the bottom of the thin tube positioning block is connected to a reset element, which is used to drive the thin tube positioning block to retract to the initial position along the guide post after the press handle is released.

[0011] Preferably, the reset element is a spring.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] 1. Effortless and safe operation: The lever-type pressing handle enables quick clamping, making operation effortless and comfortable, reducing the degree of manual operation and avoiding scratches or fatigue caused by manual splicing.

[0014] 2. High inspection efficiency: Suitable for batch inspection, with fast clamping speed, significantly improving production efficiency.

[0015] 3. High adaptability: The sealing air plate adopts an elastic sealing structure, which can be compatible with thin pipes of different diameters, reducing the frequency of tooling changes.

[0016] 4. Reliable structure and good airtightness: The guide column ensures smooth movement of the positioning block, and the reasonable design of the sealing end face ensures accurate and reliable test results.

[0017] 5. Easy to maintain and replace: Modular design, key components such as the sealing gas plate are easy to disassemble and replace, resulting in low maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure;

[0019] Figure 2 This is a frontal view of the structure.

[0020] In the figure: 1-mounting plate; 2-slim tube positioning block; 2a-drive inclined plane; 3-guide column; 4-air source fixing plate; 5-pressing handle; 6-sealing air plate; M-slim tube to be tested. Detailed Implementation

[0021] The structure and principle of this utility model will now be fully explained with reference to specific embodiments, so that those skilled in the art can fully understand and implement it.

[0022] like Figure 1 , Figure 2 As shown, this utility model discloses an efficient airtightness testing fixture for measuring the sealing effect of the end face of a thin tube, including a mounting plate 1, a thin tube positioning block 2, a guide post 3, an air source fixing plate 4, a pressing handle 5, and a sealing air plate 6.

[0023] The mounting plate 1 serves as the basic load-bearing structure for the installation of various components. An air source fixing plate 4 is fixedly installed on the left side of the mounting plate 1. A sealing air plate 6 is fixedly mounted on the air source fixing plate 4, with its inner end for contacting the end face of the thin tube and its outer end having an interface for connecting to an external air source. A guide post 3 is vertically fixed to the inner side of the air source fixing plate 4. The thin tube positioning block 2 is slidably fitted onto the guide post 3, and its top has a slot (V-shaped groove) for accommodating the thin tube, used to clamp the thin tube to be tested. The middle part of the pressing handle 5 is hinged to the bottom of the mounting plate 1 via a pivot, and its power arm end is connected to the thin tube positioning block 2 via a connecting rod. The pressing handle 5 rotates around its hinge axis, driving the thin tube positioning block 2 to move linearly along the guide post 3. (In this embodiment, the bottom of the thin tube positioning block 2 is connected to an inclined driving ramp 2a. By applying pressure to the power arm end of the press-fit handle 5, it rotates around the hinge axis, causing the power arm end to move downward, and causing the other end of the connecting rod to move upward along the ramp, pushing the thin tube positioning block 2 to move to the left along the guide post 3 to achieve sealing and docking. In a preferred embodiment, the thin tube positioning block 2 can move to the right along the guide post 3 under the action of a reset element, such as a spring, to disengage from the sealing air plate 6 and return to the initial position.)

[0024] Furthermore, the inner end face of the sealing gas plate 6 is provided with an annular sealing groove, and a sealing ring made of elastic sealing material (such as silicone, fluororubber, etc.) is embedded in the annular sealing groove to adapt to the ends of thin pipes of different diameters (usually adaptable to pipe diameters of 4mm-12mm).

[0025] Further, the height of the thin tube positioning block 2 is configured such that when the thin tube positioning block 2 moves along the guide post 3 to the position closest to the sealing gas plate 6, the end face of the thin tube forms a sealing contact with the sealing ring.

[0026] In practice, the thin tube (M) to be tested is placed into the top slot of the thin tube positioning block 2. The operator applies pressure through the force application part of the pressing handle 5. Through the lever principle, the short arm end of the handle pushes the thin tube positioning block 2 along the guide post 3 to the left until the end face of the thin tube is smoothly pressed against the elastic sealing surface of the sealing ring of the sealing gas plate 6, forming a reliable sealing cavity. Test gas at a specified pressure is introduced into the thin tube through the air source interface at the outer end of the sealing gas plate 6 to check for leaks (this check can be performed directly by water testing or by an external testing instrument or pressure sensor to determine its sealing performance). After the test is completed, the operator lifts the pressing handle 5 in the opposite direction. Under the action of the reset element (such as a spring), the thin tube positioning block 2 is driven to retreat along the guide post 3, allowing the tested thin tube to be removed and the next workpiece to be tested to be placed in.

[0027] The tooling in this embodiment is used for end-face airtightness testing of small tubes, completely replacing the traditional inefficient and unreliable manual splicing method. It achieves rapid clamping, efficient testing, and a good ergonomic experience, and is particularly suitable for batch testing operations on production lines.

[0028] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the technical principles and scope of this utility model. Therefore, any combination, modification, or substitution made to the disclosed technical features of this utility model based on its technical essence, without departing from the principles or solution of this utility model, should fall within the protection scope of this utility model.

Claims

1. A high-efficiency gas-tight detection tool for measuring the sealing effect of a small tube end face, characterized in that, The assembly includes an installation plate (1), a thin tube positioning block (2), a guide post (3), an air source fixing plate (4), a pressing handle (5), and a sealing air plate (6). The installation plate (1) is the basic load-bearing structure, and the air source fixing plate (4) is fixedly installed on the installation plate (1). The sealing air plate (6) is fixedly installed on the air source fixing plate (4), with its inner end for contacting the end face of the thin tube and its outer end having an interface for communicating with the air source. The guide post (3) is vertically fixed on the inner side of the air source fixing plate (4). The thin tube positioning block (2) is slidably fitted onto the guide post (3), and the top of the thin tube positioning block (2) has a slot for accommodating the thin tube. The middle part of the pressing handle (5) is hinged to the bottom of the installation plate (1) through a rotating shaft, and its power arm end is connected to the thin tube positioning block (2) through a connecting rod. The pressing handle (5) rotates around its hinge shaft, driving the thin tube positioning block (2) to move linearly along the guide post (3).

2. The gas tightness detection tool for measuring the sealing effect of the end face of a small tube according to claim 1, characterized in that, The inner end face of the sealing gas plate (6) is provided with an annular sealing groove, and a sealing ring made of elastic sealing material is embedded in the annular sealing groove to adapt to the ends of thin tubes of different diameters.

3. The gas tightness detection tool for measuring the sealing effect of the end face of the small tube according to claim 1, characterized in that, The slot at the top of the thin tube positioning block (2) is a V-shaped groove.

4. The high-efficiency gas-tight detection tool for measuring the sealing effect of the end face of a small tube according to claim 1, characterized in that, The height of the thin tube positioning block (2) is configured such that when the thin tube positioning block (2) moves along the guide post (3) to the position closest to the sealing gas plate (6), the end face of the thin tube is in sealing contact with the sealing ring.

5. The high-efficiency gas-tight detection tool for measuring the sealing effect of the end face of a small tube according to claim 1, characterized in that, The bottom of the thin tube positioning block (2) is connected to a reset element, which is used to drive the thin tube positioning block (2) back to the initial position along the guide post (3) after the press handle (5) is released.

6. The high-efficiency gas-tight detection tool for measuring the sealing effect of the end face of a small tube according to claim 5, characterized in that, The reset element is a spring.

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