A new type of platinum crucible leak detection tool

Abstract

This utility model discloses a novel platinum crucible leak detection tool, including a fixing mechanism, a platinum crucible, and a pressurizing mechanism. The fixing mechanism comprises a cast iron base, a stainless steel column, and a limiting platform. The column is vertically mounted on the base and passes through the limiting platform. The platinum crucible has a main body, a funnel-shaped part, and an extension. The funnel-shaped part is inserted into a hole in the limiting platform, and the extension is located between the base and the limiting platform. The limiting platform vertically limits the position of the crucible. The pressurizing mechanism includes a stainless steel pressure rod, a brominated butyl rubber stopper, and a sliding frame. The stopper is attached to the front end of the pressure rod and is interference-fitted with the inner cavity of the crucible opening. The pressure rod passes through the sliding frame, which moves vertically along the column. During leak detection, 80% of the nominal volume of ultrapure water is injected into the crucible. After the stopper is inserted, the sliding frame moves downwards under gravity to apply pressure. The outer wall of the crucible is then observed for leakage, enhancing defect visibility and improving leak detection stability and accuracy.

Description

Technical Field

[0001] This utility model relates to the field of leakage detection technology, specifically to a novel platinum crucible leak detection tool. Background Technology

[0002] In crystal growth processes, platinum crucibles serve as critical melting containers, and their sealing performance directly impacts crystal quality and production safety. Currently, platinum crucibles frequently develop micron-sized pinholes or cracks during use due to repeated high-temperature processing or manual welding, especially at corners and seed rod welds, where micro-defects of 10–50 μm are easily formed. Traditional gas-filled leak detection methods, relying on gas flow tracing and visual observation, are significantly less sensitive to these minute defects under low pressure differential conditions (<0.1 MPa), making effective identification and location difficult. Furthermore, gas leak detection equipment is complex in structure, expensive, and inconvenient to maintain, further limiting its widespread application in actual production. If these defects are not detected in time, they will lead to leakage of molten material, not only wasting valuable raw materials (loss rates can reach 5–15%) but also potentially contaminating the internal structure of the crystal growth furnace, increasing equipment maintenance costs and production risks. Therefore, there is an urgent need for a platinum crucible leak detection device that is simple in structure, easy to operate, highly sensitive, and low in cost to improve the reliability and efficiency of defect detection. Utility Model Content

[0003] Purpose of the utility model: To overcome the above shortcomings, the purpose of this utility model is to provide a novel platinum crucible leak detection tool. By designing a synergistic structure including a fixing mechanism, a pressurizing mechanism, and a platinum crucible, and using ultrapure water as the detection medium, the pressurizing mechanism is driven by gravity to form a stable liquid column pressure in the inner cavity of the crucible opening sealed by the brominated butyl rubber stopper. This replaces the traditional complex gas-filled leak detection equipment, thereby improving the detection sensitivity of micro-defects such as 10–50 μm micron-level pinholes and cracks. At the same time, it simplifies the overall structure of the device, reduces equipment costs and maintenance difficulty, and avoids the waste of molten material and crystal growth furnace contamination caused by missed detection of micro-defects.

[0004] Technical Solution: This utility model provides a novel platinum crucible leak detection tool, including a fixing mechanism. The fixing mechanism includes a base, a set of columns, and a limiting platform. The columns are vertically mounted on the base, and the set of columns passes through the outer edge of the limiting platform. The limiting platform is located above the base and fixed within the set of columns. A platinum crucible with an open inner cavity is placed on the limiting platform and surrounded by the set of columns. The limiting platform is used to limit the vertical movement of the platinum crucible. The pressurizing mechanism includes a pressure rod, a plug, and a sliding frame. The plug is installed at the front end of the pressure rod and matches the inner cavity of the opening. The pressure rod is fixed in the center of the sliding frame, which is inserted through a set of columns and moves vertically along the columns. When the test liquid is injected into the inner cavity of the platinum crucible, the plug is inserted from the opening. Under the action of gravity, the sliding frame moves downward vertically, causing the pressure rod and the plug at its front end to move downward. The system observes whether the test liquid leaks out from the outer wall of the platinum crucible. The pressurizing mechanism utilizes the weight of the sliding frame and the pressure rod to achieve dynamic pressurization: as the sliding frame moves vertically downward along the columns, it causes the front plug to precisely embed into the inner cavity of the crucible opening. The pressure converted from gravity forms a sealed environment. The pressure is proportional to the weight of the sliding frame and can be adjusted by adding or removing counterweights to ensure stable and controllable test pressure. This transforms the abstract sealing index into a direct observation of liquid leakage. If a liquid leaks from a tiny gap in a crucible under pressure, it can be determined directly by visual observation without the need for complex sensing equipment.

[0005] Furthermore, this application discloses a novel platinum crucible leak detection tool. The platinum crucible comprises a main body, a funnel portion, and an extension portion, which are connected sequentially from top to bottom. A through hole is provided in the center of the limiting platform, and the funnel portion is engaged with the through hole. The extension portion is located between the base and the limiting platform. The funnel portion is radially fixed through the through hole, preventing the crucible from shifting horizontally when pressurized. During detection, not only can the outer wall of the main body be observed, but also the outer wall of the extension portion can be directly checked for liquid leakage through the gap between the base and the limiting platform.

[0006] Furthermore, this application discloses a novel platinum crucible leak detection tool, wherein the stopper is made of brominated butyl rubber, and its outer diameter forms an interference fit of 0.5–1 mm with the inner diameter of the opening cavity. The low coefficient of friction of brominated butyl rubber, combined with the precise interference of 0.5–1 mm, eliminates the need for excessive force during installation and removal, thus avoiding damage to the crucible opening, while the pre-tightening force of the interference fit ensures that the stopper does not fall off before pressurization.

[0007] Furthermore, this application discloses a novel platinum crucible leak detection tool, wherein the detection liquid is ultrapure water, and the injection volume is 80% of the nominal volume of the platinum crucible. Ultrapure water has extremely low impurity content, ensuring that leaks from the main body to the outer wall of the extension can be accurately identified. The 80% injection volume ensures that the core area of ​​the three-section structure is in a liquid-wetted state, with no detection blind spots.

[0008] Furthermore, in this application, a novel platinum crucible leak detection tool is provided, wherein a fluorescent tracer is added to the ultrapure water to enhance the visibility of the defect location.

[0009] Furthermore, in this application, a novel platinum crucible leak detection tool is provided, wherein the base is made of cast iron, and the column, limiting platform, and pressure rod are all made of stainless steel.

[0010] As can be seen from the above technical solution, this utility model has the following beneficial effects: 1. The novel platinum crucible leak detection tool of this utility model adopts a gravity-driven dynamic pressurization mechanism, uses ultrapure water as the detection medium, and combines a fixing mechanism adapted to the platinum crucible structure with a brominated butyl rubber stopper. It can achieve high-sensitivity detection of 10-50μm micron-level pinholes and cracks without the need for an external gas source or complex equipment, effectively replacing the traditional air-filling leak detection method and significantly reducing equipment costs and maintenance difficulty.

[0011] 2. The novel platinum crucible leak detection tool of this utility model achieves radial positioning and full-surface visual detection by setting a perforated limiting stage that matches the three-section platinum crucible structure. Combined with an ultrapure water medium in which fluorescent tracers can be added, it can intuitively and accurately identify the location of defects, avoid blind spots in detection, and thus prevent material leakage and equipment contamination caused by missed detection, thereby improving detection reliability and production efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a novel platinum crucible leak detection tool according to the present invention; Figure 2 This is a side view of a novel platinum crucible leak detection tool according to the present invention; Figure 3 This is a cross-sectional view of a novel platinum crucible leak detection tool according to this utility model.

[0013] Explanation of reference numerals on the accompanying drawings: 1-Fixing mechanism, 11-Base, 12-Column, 13-Limiting platform, 131-Perforation; 2-Platinum crucible, 21-Open inner cavity, 22-Main body, 23-Function funnel, 24-Extension; 3-Pressure mechanism, 31-Pressure rod, 32-Plug, 33-Sliding frame. Detailed Implementation

[0014] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0015] Example 1 like Figure 1 , Figure 2 and Figure 3 The invention relates to a novel platinum crucible leak detection tool, comprising a fixing mechanism 1, a platinum crucible 2, and a pressurizing mechanism 3.

[0016] The fixing mechanism 1 consists of a base 11, three columns 12, and a triangular limiting platform 13. The three columns 12 are vertically welded to the cast iron base 11 and are arranged in an equilateral triangle. The three corners of the limiting platform 13 are respectively inserted into the three columns 12 and fixed to the top of the base 11 by bolts. A circular through hole 131 is opened in the center of the limiting platform 13 for radial positioning of the platinum crucible 2.

[0017] The platinum crucible 2 has a three-section structure, consisting of a main body 22, a funnel-shaped part 23, and an extension 24 from top to bottom. Before testing, the platinum crucible 2 is placed on the limiting platform 13 from top to bottom: the funnel-shaped part 23 is fitted into the through hole 131, the extension 24 passes through the through hole 131 and is located between the base 11 and the limiting platform 13, and the main body 22 stands on the limiting platform 13. Thus, three pillars 12 surround the platinum crucible 2, which both restricts its horizontal displacement and ensures that the outer wall is visible 360°.

[0018] The pressurizing mechanism 3 consists of a pressure rod 31, a stopper 32, and a sliding frame 33. The pressure rod 31 is a stainless steel round rod, with a stopper 32 made of brominated butyl rubber press-fitted to its front end. The outer diameter of the stopper 32 is larger than the inner diameter of the opening cavity 21 of the platinum crucible 2, forming a reliable seal. The sliding frame 33 is an equilateral triangular plate, with its three corners respectively passing through three columns 12, allowing it to slide freely along the columns 12 in the vertical direction; the pressure rod 31 is vertically inserted and threadedly locked to the center of the sliding frame 33.

[0019] The testing steps are as follows: Slowly inject ultrapure water into the open cavity 21 of the platinum crucible 2 until it reaches 80% of the nominal volume, and add a trace amount of fluorescent tracer.

[0020] Align the plug 32 with the inner cavity 21 of the opening, release the sliding bracket 33, and let it move down along the three columns 12 under the action of gravity until the plug 32 is completely inserted into the inner cavity 21 of the opening.

[0021] After standing for 10 minutes, visually inspect the outer walls of the main body 22, the funnel part 23, and the extension part 24; if fluorescent liquid seepage is found, mark the defect location.

[0022] After the test is completed, lift the sliding frame 33, take out the platinum crucible 2, pour out the ultrapure water and blow it dry with nitrogen.

[0023] In this embodiment, gravity drives the sliding frame 33 to move smoothly down along the three columns 12, thereby achieving stable pressure application of the brominated butyl rubber stopper 32 to the platinum crucible 2. The triangular limiting platform 13 and the perforation 131 work together to ensure accurate positioning of the crucible without shaking. The three-section platinum crucible 2 ensures that the outer walls of the main body 22, the funnel part 23 and the extension part 24 are all within the visible range, eliminating blind spots in the detection.

[0024] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A novel platinum crucible leak detection tool, characterized in that: include: The fixing mechanism (1) includes a base (11), a set of columns (12) and a limiting platform (13). The columns (12) are vertically installed on the base (11). The set of columns (12) passes through the outer edge of the limiting platform (13). The limiting platform (13) is located above the base (11) and fixed in the set of columns (12). A platinum crucible (2) is provided with an open inner cavity (21). The platinum crucible (2) is placed on a limiting platform (13) and surrounded by a set of columns (12). The limiting platform (13) is used to limit the platinum crucible (2) in the vertical direction. The pressurizing mechanism (3) includes a pressure rod (31), a plug (32), and a sliding frame (33). The plug (32) is installed at the front end of the pressure rod (31) and matches the inner cavity (21) of the opening. The pressure rod (31) is fixed in the center of the sliding frame (33). The sliding frame (33) is inserted in a set of columns (12) and moves vertically along the columns (12).

2. The novel platinum crucible leak detection tool according to claim 1, characterized in that, The platinum crucible (2) includes a main body (22), a funnel (23) and an extension (24), which are connected sequentially from top to bottom. The limiting platform (13) has a through hole (131) in the center, the funnel (23) is fitted onto the through hole (131), and the extension (24) is located between the base (11) and the limiting platform (13).

3. The novel platinum crucible leak detection tool according to claim 1, characterized in that, The plug (32) is made of brominated butyl rubber, and its outer diameter forms an interference fit of 0.5–1 mm with the inner diameter of the opening cavity (21).

4. The novel platinum crucible leak detection tool according to claim 1, characterized in that, The base (11) is made of cast iron, and the column (12), the limiting platform (13), and the pressure rod (31) are all made of stainless steel.

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