Device for detecting coaxiality of sealing surface of inner container of four-type bottle

Abstract

The invention discloses a device for detecting the coaxiality of a sealing surface of an inner container of a four-type bottle, and relates to the technical field of gas cylinders, the device comprises a limiting block, a connecting column, a centering guide cylinder and a gap measuring tool, the outer diameter of the connecting column is larger than that of the centering guide cylinder, and the outer diameter of the centering guide cylinder is smaller than the inner diameter of a cylinder sealing surface of the inner container of the four-type bottle; a plurality of measuring grooves are sequentially formed in the connecting column in the circumferential direction, one end of each measuring groove extends and penetrates through the top end of the limiting block, the other end of each measuring groove extends to the upper portion of the centering guide cylinder, and the vertical distance between the central axis of the connecting column and the bottom face of each measuring groove is smaller than the radius of the centering guide cylinder. The connecting column is used for being coaxially and fixedly installed in a metal valve seat of the four-type bottle, and the gap measuring tool is used for being inserted into the measuring groove so as to measure the gap between the bottom face of the measuring groove and the cylindrical sealing face of the inner container. According to the device, the inner container with unqualified coaxiality can be detected, so that the waste of production materials and the influence on the production efficiency are avoided.

Description

Technical Field

[0001] This invention relates to the field of gas cylinder technology, and in particular to a device for detecting the coaxiality of the sealing surface of the inner liner of a type IV gas cylinder. Background Technology

[0002] Hydrogen energy, as a clean, low-carbon, high-energy-density, and recyclable secondary energy source, has become one of the core solutions to address global energy transition, climate change, and environmental pollution challenges. In recent years, hydrogen energy has gradually moved from the technology research and development stage to large-scale application, demonstrating irreplaceable strategic value, especially in transportation, industry, energy storage, and power generation. High-pressure hydrogen energy storage and transportation technology, as a core link in the hydrogen energy industry chain, directly determines the coverage of hydrogen energy application scenarios and the efficiency of commercialization.

[0003] Plastic-lined carbon fiber fully wound gas cylinders (Type IV) have become an important type of hydrogen storage cylinder under research and development due to their high hydrogen storage density and volumetric weight ratio. Type IV cylinders use a plastic inner liner as the hydrogen storage space, combined with an externally wound carbon fiber layer to achieve high-pressure hydrogen storage and transportation. The plastic inner liner consists of a metal valve seat and a plastic container; the combination of these two components plays a decisive role in the performance of the cylinder inner liner.

[0004] Inner liners manufactured using rotational molding or other one-piece molding processes work by fitting a plastic container to a fixed metal valve seat to form the inner liner. This molding process utilizes centrifugal force generated by rotation or mold pressure. However, eccentricity during rotation or poor mold alignment can cause deviations in the coaxiality of the sealing cylindrical surface of the plastic inner liner. Coaxiality deviations exceeding the required process range can affect the gas cylinder's seal, leading to cylinder failure. Failure to detect and address this deviation beforehand results in wasted production resources and reduced production efficiency. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a coaxiality detection device for the sealing surface of the inner liner of a type IV bottle, which can detect inner liners with unqualified coaxiality, thereby avoiding waste of production materials and affecting production efficiency.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a device for detecting the coaxiality of the sealing surface of the inner liner of a Type IV bottle, comprising a limiting block, a connecting column, a centering guide cylinder, and a gap measuring tool. The limiting block, the connecting column, and the centering guide cylinder are sequentially fixedly connected. The central axes of the connecting column and the centering guide cylinder are collinear. The outer diameter of the connecting column is larger than the outer diameter of the centering guide cylinder, and the outer diameter of the centering guide cylinder is smaller than the inner diameter of the sealing surface of the inner liner of the Type IV bottle. Multiple measuring grooves are sequentially arranged circumferentially on the connecting column. Each measuring groove extends axially along the connecting column. One end of each measuring groove extends through the top of the limiting block, and the other end extends to the upper part of the centering guide cylinder. The vertical distance between the central axis of the connecting column and the bottom surface of each measuring groove is smaller than the radius of the centering guide cylinder. The connecting column is coaxially fixedly installed in the metal valve seat of the Type IV bottle. The gap measuring tool is inserted into the measuring groove to measure the gap between the bottom surface of the measuring groove and the sealing surface of the inner liner.

[0007] Preferably, the cross-sectional dimension of the limiting block is larger than the cross-sectional dimension of the connecting column.

[0008] Preferably, the plane containing the center line of the bottom surface of each measuring groove and the central axis of the connecting column is perpendicular to the bottom surface of the measuring groove.

[0009] Preferably, each of the measuring slots is a rectangular slot.

[0010] Preferably, the end of each measuring groove away from the limiting block is a downwardly convex arc surface structure.

[0011] Preferably, the connecting post is a threaded post, and the outer wall of the threaded post is provided with an external thread that matches the internal thread structure on the inner wall of the metal valve seat. The threaded post is used for threaded installation in the metal valve seat.

[0012] Preferably, the gap measuring tool is a feeler gauge.

[0013] Preferably, the feeler gauge includes multiple measuring plates of different thicknesses, and the width of each measuring plate is the same as the width of the bottom surface of the measuring groove.

[0014] Preferably, a plurality of measuring grooves are evenly arranged along the circumference of the connecting column.

[0015] Preferably, six measuring grooves are evenly arranged along the circumference of the connecting column.

[0016] The present invention achieves the following technical effects compared to the prior art: The coaxiality detection device for the inner liner sealing surface of the four-type bottle of the present invention includes a limiting block, a connecting column, a centering guide cylinder, and a gap measuring tool. The limiting block, connecting column, and centering guide cylinder are fixedly connected in sequence. Multiple measuring grooves are sequentially arranged circumferentially on the connecting column. One end of each measuring groove extends through the top of the limiting block, and the other end extends to the upper part of the centering guide cylinder. The vertical distance between the central axis of the connecting column and the bottom surface of each measuring groove is less than the radius of the centering guide cylinder. In use, the connecting column is coaxially fixedly installed in the metal valve seat of the four-type bottle. The gap measuring tool is inserted into the measuring groove to measure the gap between the bottom surface of the measuring groove and the sealing surface of the inner liner cylinder, thereby obtaining the gap measurement value. The gap measurement values ​​at each circumferential position are recorded. Each gap measurement value is compared with the gap design value. If the difference between the gap measurement value and the gap design value at all circumferential positions is within a preset error threshold range, the coaxiality of the inner liner sealing surface of the four-type bottle is determined to meet the requirements; if the difference at any position exceeds the error threshold range, the coaxiality is determined to be unqualified. The device in this application can detect the sealing surface of the inner liner after molding and before subsequent processes, thereby identifying inner liners with unqualified coaxiality and scrapping them to prevent unqualified products from flowing into subsequent processing stages, thus avoiding waste of production materials and impact on production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the coaxiality detection device for the sealing surface of the four types of bottle liners provided by the present invention; Figure 2 A schematic diagram illustrating the use of the four-type bottle inner liner sealing surface coaxiality detection device provided by the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 A schematic diagram illustrating the principle of determining the time interval design value using the four-type bottle inner liner sealing surface coaxiality detection device provided by this invention; Figure 5 for Figure 4 A magnified view of a section at point B.

[0019] Explanation of reference numerals in the attached drawings: 1. Limiting block; 2. Connecting column; 3. Centering guide cylinder; 4. Measuring groove; 41. Bottom surface; 5. Plastic container; 6. Metal valve seat; 7. Inner cylinder sealing surface; 8. Inner contact surface. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a coaxiality detection device for the sealing surface of the inner liner of a type IV bottle, which can detect inner liners with unqualified coaxiality, thereby avoiding waste of production materials and affecting production efficiency.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1-5 As shown, this embodiment provides a coaxiality detection device for the inner liner sealing surface of a type IV bottle, including a limiting block 1, a connecting column 2, a centering guide cylinder 3, and a gap measuring tool. The limiting block 1, the connecting column 2, and the centering guide cylinder 3 are fixedly connected in sequence. The central axes of the connecting column 2 and the centering guide cylinder 3 are collinear. The outer diameter of the connecting column 2 is larger than the outer diameter of the centering guide cylinder 3, and the outer diameter of the centering guide cylinder 3 is smaller than the inner diameter of the inner liner cylindrical sealing surface 7 of the type IV bottle. Multiple measuring grooves 4 are arranged circumferentially on the connecting column 2. Each measuring groove 4 extends along the axial direction of the connecting column 2. One end of each measuring groove 4 extends through the top of the limiting block 1, and the other end of each measuring groove 4 extends to the upper part of the centering guide cylinder 3. The vertical distance between the central axis of the connecting column 2 and the bottom surface 41 of each measuring groove 4 is smaller than the radius of the centering guide cylinder 3. The plastic container 5 is formed by fitting the metal valve seat 6 with the fixed metal valve seat 6 to form the inner liner. The connecting column 2 is used to be coaxially fixed in the metal valve seat 6 of the type IV bottle. The gap measuring tool is used to be inserted into the measuring groove 4 to measure the gap between the bottom surface 41 of the measuring groove 4 and the cylindrical sealing surface 7 of the inner liner.

[0024] In use, the connecting column 2 is coaxially fixedly installed in the metal valve seat 6 of the Type IV bottle. The gap measuring tool is inserted into the measuring groove 4 to measure the gap between the bottom surface 41 of the measuring groove 4 and the cylindrical sealing surface 7 of the inner liner, thereby obtaining the gap measurement value. The gap measurement values ​​at each circumferential position are recorded, and each gap measurement value is compared with the gap design value. If the difference between the gap measurement value and the gap design value at all circumferential positions is within the preset error threshold range, the coaxiality of the sealing surface of the inner liner of the Type IV bottle is determined to meet the requirements; if the difference at any position exceeds the error threshold range, the coaxiality is determined to be unqualified. The device in this application can complete the inspection of the inner liner sealing surface after molding and before subsequent processes, thereby detecting inner liners with unqualified coaxiality and scrapping them to prevent unqualified products from flowing into subsequent processing stages, thus avoiding waste of production materials and affecting production efficiency.

[0025] Specifically, the cross-sectional dimension of the limiting block 1 is larger than that of the connecting column 2, thereby limiting the upper part of the connecting column 2 when it is installed in the metal valve seat 6.

[0026] In this specific embodiment, the plane containing the center line of the bottom surface 41 of each measuring groove 4 and the central axis of the connecting column 2 is perpendicular to the bottom surface 41 of the measuring groove 4.

[0027] In this embodiment, each measuring groove 4 is a rectangular groove.

[0028] Specifically, the end of each measuring groove 4 away from the limiting block 1 is a downwardly convex arc surface structure.

[0029] In this embodiment, the connecting post 2 is a threaded post. The outer wall of the threaded post is provided with an external thread that matches the internal thread structure on the inner wall of the metal valve seat 6. The threaded post is used for threaded installation in the metal valve seat 6.

[0030] In this embodiment, the gap measuring tool is a feeler gauge.

[0031] Specifically, the feeler gauge includes multiple measuring plates of different thicknesses, and the width of each measuring plate is the same as the width of the bottom surface 41 of the measuring groove 4.

[0032] Specifically, multiple measuring grooves 4 are evenly arranged along the circumference of the connecting column 2.

[0033] In this specific embodiment, six measuring grooves 4 are evenly arranged along the circumference of the connecting column 2.

[0034] In this specific embodiment, the difference between the radius of the connecting column 2 and the vertical distance between the central axis of the connecting column 2 and the bottom surface 41 of the measuring groove 4 is greater than the difference between the radius of the inner cylindrical sealing surface 7 and the vertical distance between the central axis of the connecting column 2 and the bottom surface 41 of the measuring groove 4.

[0035] The specific usage process is as follows: Step 1: Tighten the internal thread of the connecting column 2 and the metal valve seat 6 of the Type IV bottle clockwise to fix them. At this time, the coaxiality detection device of the inner sealing surface of the Type IV bottle and the metal valve seat 6 become a whole and the coaxiality is consistent.

[0036] Step 2: Use a feeler gauge to measure the coaxiality error of the inner cylinder sealing surface 7 corresponding to the position of the measuring groove 4.

[0037] like Figure 4 and Figure 5 As shown, the clearance design value is first determined. The outer diameter of the centering guide cylinder 3, the inner diameter of the inner cylinder sealing surface 7, and the vertical distance between the central axis of the connecting column 2 and the bottom surface 41 of the measuring groove 4 are all known fixed values. Each bottom surface 41 of the measuring groove 4 has a corresponding inner contact surface 8. In this embodiment, the inner contact surface 8 is connected to the inner wall of the inner cylinder sealing surface 7, and the inner contact surface 8 is parallel to the bottom surface 41 of the corresponding measuring groove 4. The width of the inner contact surface 8 and the bottom surface 41 of the corresponding measuring groove 4 are the same. The vertical distance d between the inner contact surface 8 and the bottom surface 41 of the corresponding measuring groove 4 is the clearance design value.

[0038] The measurement process is as follows: insert measuring scales of different thicknesses into the feeler gauge so that the two ends of the outermost measuring scale are in contact with the inner cylindrical sealing surface 7. Record the sum of the thicknesses of all the measuring scales inserted at this time to obtain the gap measurement value. Take the absolute value of the difference between the gap measurement value and the gap design value to obtain the coaxiality deviation at this point.

[0039] Step 3: Repeat step 2 to measure the coaxiality deviation in the six circumferential directions.

[0040] Step 4: Unscrew the coaxiality detection device of the inner sealing surface of the Type 4 bottle counterclockwise to separate it from the inner liner of the Type 4 bottle.

[0041] Step 5: Statistically analyze and organize the measured coaxiality deviations in the six circumferential directions to determine whether the coaxiality deviation of the inner liner meets the production process requirements. Specifically, if the coaxiality deviation at all circumferential positions is within the preset error threshold range, the coaxiality of the sealing surface of the inner liner of the type IV bottle is deemed to meet the requirements; if the coaxiality deviation at any position exceeds the error threshold range, the coaxiality of the inner liner is deemed to be unqualified.

[0042] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A device for detecting the coaxiality of the sealing surface of a type IV bottle liner, characterized in that, The device includes a limiting block, a connecting column, a centering guide cylinder, and a gap measuring tool. The limiting block, the connecting column, and the centering guide cylinder are sequentially fixedly connected. The central axes of the connecting column and the centering guide cylinder are collinear. The outer diameter of the connecting column is larger than the outer diameter of the centering guide cylinder, and the outer diameter of the centering guide cylinder is smaller than the inner diameter of the sealing surface of the inner cylinder of the Type IV bottle. Multiple measuring grooves are sequentially arranged circumferentially on the connecting column. Each measuring groove extends along the axial direction of the connecting column. One end of each measuring groove extends through the top of the limiting block, and the other end of each measuring groove extends to the upper part of the centering guide cylinder. The vertical distance between the central axis of the connecting column and the bottom surface of each measuring groove is smaller than the radius of the centering guide cylinder. The connecting column is used for coaxial fixed installation in the metal valve seat of the Type IV bottle. The gap measuring tool is used to insert into the measuring groove to measure the gap between the bottom surface of the measuring groove and the sealing surface of the inner cylinder.

2. The coaxiality detection device for the sealing surface of the inner liner of a four-type bottle according to claim 1, characterized in that, The cross-sectional dimension of the limiting block is larger than the cross-sectional dimension of the connecting column.

3. The coaxiality detection device for the sealing surface of the inner liner of a four-type bottle according to claim 1, characterized in that, The plane containing the center line of the bottom surface of each measuring groove and the central axis of the connecting column is perpendicular to the bottom surface of the measuring groove.

4. The coaxiality detection device for the sealing surface of the inner liner of a four-type bottle according to claim 1, characterized in that, Each of the measuring slots is a rectangular slot.

5. The coaxiality detection device for the sealing surface of the inner liner of a four-type bottle according to claim 1, characterized in that, The end of each measuring groove away from the limiting block is a downwardly convex arc surface structure.

6. The coaxiality detection device for the sealing surface of the inner liner of a four-type bottle according to claim 1, characterized in that, The connecting post is a threaded post, and the outer wall of the threaded post is provided with an external thread that matches the internal thread structure on the inner wall of the metal valve seat. The threaded post is used for threaded installation in the metal valve seat.

7. The coaxiality detection device for the sealing surface of the inner liner of a four-type bottle according to claim 1, characterized in that, The gap measuring tool is a feeler gauge.

8. The coaxiality detection device for the sealing surface of the inner liner of a four-type bottle according to claim 7, characterized in that, The feeler gauge includes multiple measuring plates of different thicknesses, and the width of each measuring plate is the same as the width of the bottom surface of the measuring groove.

9. The coaxiality detection device for the sealing surface of the inner liner of a four-type bottle according to claim 1, characterized in that, Multiple measuring grooves are evenly arranged along the circumference of the connecting column.

10. The coaxiality detection device for the sealing surface of the inner liner of a four-type bottle according to claim 9, characterized in that, The connecting column has six measuring grooves evenly arranged along its circumference.

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