Ultrasonic wall thickness detection clamp and method suitable for natural gas station blowdown valve body

Abstract

This invention discloses an ultrasonic wall thickness testing fixture and method for natural gas station sewage valve bodies. The fixture includes a bridge and a connecting rod. Adsorption structures are fixedly connected downwards to both sides of the bridge. The connecting rod is perpendicularly intersecting the bridge, with an adjustment structure at its upper part and a telescopic component in its middle. A probe is externally connected to the bottom of the connecting rod. The connecting rod, driving the probe, can slide left and right along the bridge via the adjustment structure. The adsorption structures fix the fixture to the outer wall of the sewage valve body, and the adjustment structure ensures a tight fit between the probe and the outer wall of the sewage valve body. This fixture is used to hold the probe, achieving a tight fit between the probe and the valve body body during operation and normal use after release, thus making the measurement results more accurate and stable, guaranteeing the accuracy of the measurement results. The detection method of this invention can achieve a detection accuracy of over 83%.

Description

Technical Field

[0001] This invention relates to the field of wall thickness testing technology, specifically to an ultrasonic wall thickness testing fixture and method applicable to the valve body of a natural gas station's sewage valve. Background Technology

[0002] To address the issue of external leakage easily occurring in the drain valves of gas transmission stations, a method for determining the ultrasonic monitoring points for the outer wall thickness of DN50 drain valves was proposed. In addition, an ultrasonic wall thickness testing instrument fixture capable of fixing monitoring points on the drain valve was developed.

[0003] ① The bottom drain system of the gas transmission station separator is mainly used to discharge dust and dirt deposited at the bottom of the multi-tube dry separator. The drain process is as follows: first, fully open the gate valve, then open the drain valve and maintain the opening at 20% to 30% (average 25%) for 60 to 120 seconds. The pressure difference between the internal pressure of the separator (6.4 MPa) and atmospheric pressure is used to push out the dust at the bottom of the separator. In a short period of time, the high concentration of dust flows at high speed through the drain valve and drain pipeline. This operation often causes punctures and leaks on the outer wall of the drain valve, resulting in a large amount of natural gas leakage, which poses a serious threat to the safety of the gas transmission station and even the surrounding residents.

[0004] ② Ultrasonic thickness gauges are instruments that measure thickness based on the principle of ultrasonic pulse reflection. They are currently widely used for wall thickness inspection of pipes, valves, and elbows. An ultrasonic thickness gauge mainly consists of two parts: the main unit and the probe. During operation, the operator needs to hold the probe close to the pipe for measurement. Feedback from on-site personnel indicates that significant human error can occur during this handheld probe operation due to shaking or other factors, affecting the measurement results and resulting in low accuracy. Summary of the Invention

[0005] The technical problem this invention aims to solve is that existing ultrasonic thickness gauges require operators to hold the probe close to the pipeline during operation. This handheld operation introduces significant human error due to shaking or other factors, affecting measurement results and leading to low accuracy and poor stability. Furthermore, existing technologies have low accuracy in identifying risk points at the location of leaks in natural gas transmission station drain valves.

[0006] The purpose of this invention is to provide an ultrasonic wall thickness detection fixture and method applicable to the valve body of a natural gas station drain valve. The ultrasonic wall thickness detection fixture of this invention can ensure a tight fit between the probe and the pipeline, guarantee the stability of the measurement results, and improve the measurement accuracy. The method of this invention not only clarifies the measurement method of the specific wall thickness reduction point of the drain valve, but also improves the accuracy of ultrasonic wall thickness detection.

[0007] This invention is achieved through the following technical solution:

[0008] In a first aspect, the present invention provides an ultrasonic wall thickness testing fixture for the body of a sewage valve in a natural gas station. The fixture includes a bridge and a connecting rod. Adsorption structures are fixedly connected downwards on both sides of the bridge. The connecting rod is arranged perpendicularly to the bridge. An adjustment structure is provided on the upper part of the connecting rod, and a telescopic component is provided in the middle of the connecting rod. A probe is externally connected to the bottom of the connecting rod. The connecting rod drives the probe to slide left and right along the bridge through the adjustment structure. The bridge is a rigid bridge.

[0009] The clamp is fixed to the outer wall of the drain valve body by the adsorption structure, and the adjustment structure can control the probe connected to the bottom of the connecting rod to be tightly connected to the outer wall of the drain valve body.

[0010] The working principle is as follows: Existing ultrasonic thickness gauges require operators to hold the probe close to the pipeline during operation. This handheld operation introduces significant human error due to shaking or other factors, affecting measurement results and leading to low accuracy and poor stability. Therefore, this invention addresses the human error inherent in ultrasonic thickness gauges by designing an ultrasonic wall thickness measuring fixture suitable for natural gas station drain valves. This fixture holds the probe, ensuring a tight fit between the probe and the valve body during operation and allowing for normal use after removal from the hand. This results in more accurate and stable measurement results, thus guaranteeing the accuracy of the measurements.

[0011] Furthermore, the adjustment structure includes a threaded sleeve and a spring. The threaded sleeve is disposed on the upper part of the connecting rod, and the threaded sleeve is connected to the bridge through a threaded pair. A spring is connected to the bottom of the threaded sleeve, and the spring is wound around the connecting rod. A probe is externally connected to the bottom of the spring through a hard insulating sleeve. The tight fit between the probe and the outer wall of the drain valve body is adjusted by moving the threaded sleeve up and down.

[0012] The upper outer wall of the connecting rod is provided with threads that cooperate with the threaded sleeve.

[0013] Furthermore, the adsorption structure includes a permanent magnet chuck and a permanent magnet chuck switch. The permanent magnet chuck is equipped with a permanent magnet chuck switch, which controls whether the permanent magnet chuck generates magnetic force by opening or closing the permanent magnet chuck, thereby controlling whether the clamp is in contact with the outer wall of the drain valve body.

[0014] Furthermore, the adsorption structure also includes a flexible body, which is fixedly connected to the permanent magnet chuck, ensuring that the clamp adheres to the outer wall of the drain valve body during the adsorption process.

[0015] Furthermore, the flexible body is made of magnetic material, such as magnetic rubber, to ensure magnetic conductivity.

[0016] Furthermore, the clamp also includes a limiting structure, which includes a clamp and a limiting sleeve. The clamp is fixed to the top of the connecting rod, and the limiting sleeve is disposed on the top of the hard insulating sleeve and is disposed outside the spring. The top of the limiting sleeve is a certain distance from the bottom of the threaded sleeve.

[0017] The clamp and limiting sleeve together limit the spring, ensuring that the spring's stretching and compression do not exceed its maximum limit.

[0018] Furthermore, the limiting sleeve is made of a non-magnetic material, and the bridge is also made of a non-magnetic material.

[0019] Furthermore, the bridge and the connecting rod corresponding to the threaded sleeve are both provided with scales, which enable precise adjustment.

[0020] Secondly, this invention provides an ultrasonic wall thickness detection method applicable to the valve body of a natural gas station drain valve. This method is applied to the detection and identification of risk points related to wall thinning in DN50 drain valves. The method includes:

[0021] Step 1: Use two sheet metal plates to form a cylinder at the top and bottom of the drain valve body. Use a spirit level to ensure that the cylinder is parallel to the ground. The cylinder intersects with the drain valve body to form four base points. Mark these base points on the outer wall of the drain valve body using a ruler and a marker.

[0022] Step 2: Based on the aforementioned base points, an arc-shaped search method is used to obtain three types of risk points: the first type of risk point, the second type of risk point, and the third type of risk point; and these risk points are used as wall thickness detection points.

[0023] Step 3: Use an ultrasonic wall thickness testing fixture to attach a fixed electromagnetic probe to the valve body of the drain valve and perform valve wall thickness testing at the testing point; wherein, the ultrasonic wall thickness testing fixture is the ultrasonic wall thickness testing fixture applicable to the drain valve body of the natural gas station.

[0024] Furthermore, the aforementioned arc-shaped search method yields three types of risk points; specifically including:

[0025] The four basic points are designated as basic points ①, ②, ③, and ④.

[0026] The first type of risk point: By finding the point on the line connecting the outer arc lengths of base points ① and ④, and being close to 1 / 6 of the length of ①, this point is identified as risk point Point_B1; the intersection of the horizontal arc where the outer arc connecting base points ① and ④ intersects with the horizontal arc where the outer arc of base points ② and ③ intersects with the vertical arc where risk point Point_B1 is located is identified as risk point Point_B1-2; the midpoint of the outer arcs of risk points Point_B1 and risk point Point_B1-2 is identified as risk point Point_B1-1;

[0027] The second type of risk point: by finding the intersection of the outer wall arcs of base points ① and ④ with the outer wall arcs of ② and ③, the risk point Point_B 2-2 is identified; the midpoint of the outer wall arcs of base points ① and ④ is identified as risk point Point_B 2; the midpoint of the outer wall arcs of risk point Point_B 2 and risk point Point_B 2-2 is identified as risk point Point_B 2-1.

[0028] The third type of risk point: by finding the point on the line connecting the outer arc lengths of base points ② and ③, and being close to 1 / 4 of the length of ③, this point is identified as risk point Point_B 3; the midpoint of the outer arc connecting base points ③ and ④ is identified as risk point Point_B 3-2; and the midpoint of the outer arc connecting risk points Point_B 3 and Point_B 3-2 is identified as risk point Point_B 3-1.

[0029] Verification revealed the following: First, leaks frequently occur at the three types of risk points identified above, based on actual on-site data. Second, given that it is a type of throttling valve, calculations showed that the flow velocity was highest at the three types of risk points identified above.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] 1. Based on the human error that occurs when using an ultrasonic thickness gauge, this invention designs an ultrasonic wall thickness detection fixture suitable for the valve body of a natural gas station sewage valve. The fixture is used to hold the probe, achieving a tight fit between the probe and the outer wall of the valve body during operation and normal use after the probe is removed from the hand. This makes the measurement results more accurate and stable, thereby ensuring the accuracy of the measurement results.

[0032] 2. The detection accuracy of the method of the present invention can reach more than 83% (error less than 17%). Compared with the existing technology, the risk point identification accuracy for the leakage location of the sewage valve of the natural gas transmission station is only 20% to 30%. The detection accuracy of the method of the present invention is significantly improved. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 This is a schematic diagram of the ultrasonic wall thickness detection fixture for the valve body of the sewage valve at a natural gas station, applicable to the present invention.

[0035] Figure 2 This is a schematic diagram illustrating the risk points identified by the ultrasonic wall thickness detection method for the valve body of the natural gas station drain valve, applicable to the present invention.

[0036] Figure 3 This is a detailed schematic diagram illustrating the risk point determination of the ultrasonic wall thickness detection method for the valve body of the sewage valve at a natural gas station, applicable to the present invention.

[0037] Figure 4 This is a flowchart illustrating the ultrasonic wall thickness detection method for the drain valve body of a natural gas station, applicable to the present invention.

[0038] Figure reference numerals and corresponding component names:

[0039] 1. Clamp, 2. Threaded sleeve, 3. Bridge, 4. Permanent magnet chuck, 5. Permanent magnet chuck switch, 6. Flexible body, 7. Spring, 8. Limit sleeve, 9. Probe, 10. Valve body outer wall, 11. Connecting rod. Detailed Implementation

[0040] In the following, the terms “comprising” or “may include” as used in various embodiments of the invention indicate the presence of an inventive function, operation, or element, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the invention, the terms “comprising,” “having,” and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or adding one or more combinations of the foregoing.

[0041] In various embodiments of the invention, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0042] The expressions used in the various embodiments of the present invention (such as "first," "second," etc.) may modify various constituent elements in the various embodiments, but do not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, a first user device and a second user device refer to different user devices, although both are user devices. For example, a first element may be referred to as a second element without departing from the scope of the various embodiments of the present invention, and similarly, a second element may also be referred to as a first element.

[0043] It should be noted that if a description is made of "connecting" one component to another, then the first component can be directly connected to the second component, and a third component can be "connected" between the first and second components. Conversely, when a component is "directly connected" to another component, it can be understood that there is no third component between the first and second components.

[0044] The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to limit the various embodiments of the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the invention pertain. The terms (such as those defined in a generally used dictionary) are to be interpreted as having the same meaning as in the context of the relevant technical field and are not to be interpreted as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of the invention.

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0046] Example 1

[0047] like Figure 1As shown, this invention relates to an ultrasonic wall thickness testing fixture for the body of a natural gas station sewage valve. The fixture includes a bridge 3 and a connecting rod 11. Adsorption structures are fixedly connected downwards to both sides of the bridge 3. The connecting rod 11 is perpendicularly intersecting the bridge 3. An adjustment structure is provided at the upper part of the connecting rod 11, and a telescopic component is provided in the middle of the connecting rod 11. A probe 9 is externally connected to the bottom of the connecting rod 11. The connecting rod 11 drives the probe 9 to slide left and right along the bridge 3 via the adjustment structure. The bridge 3 is a rigid bridge. A slide rail is provided on the bridge 3, and the connecting rod 11 drives the probe 9 to slide left and right along the slide rail on the bridge 3 via the adjustment structure.

[0048] The clamp is fixed to the outer wall 10 of the drain valve body by the adsorption structure, and the adjustment structure can control the probe connected to the bottom of the connecting rod 11 to be tightly connected to the outer wall of the drain valve body.

[0049] In this embodiment, the connecting rod 11 is equipped with wires and power supply connection lines to enable the probe to work normally.

[0050] In this embodiment, the adjustment structure includes a threaded sleeve 2 and a spring 7. The threaded sleeve 2 is located on the upper part of the connecting rod 11, and the threaded sleeve 2 is connected to the bridge 3 through a threaded pair. The bottom of the threaded sleeve 2 is connected to the spring 7, which is wound around the connecting rod 11, and the bottom of the spring 7 is connected to a probe 9 through a hard insulating sleeve. The probe is adjusted to fit tightly against the outer wall 10 of the drain valve body by moving the threaded sleeve 2 up and down.

[0051] The upper outer wall of the connecting rod 11 is provided with threads that cooperate with the threaded sleeve 2.

[0052] In this embodiment, the adsorption structure includes a permanent magnet chuck 4 and a permanent magnet chuck switch 5. The permanent magnet chuck 4 is equipped with a permanent magnet chuck switch 5. The permanent magnet chuck 4 is opened or closed to control whether the permanent magnet chuck 4 generates magnetic force, thereby controlling whether the clamp is in contact with the outer wall 10 of the drain valve body.

[0053] In this embodiment, the adsorption structure further includes a flexible body 6, which is fixedly connected to the permanent magnet chuck 4, ensuring that the clamp fits against the outer wall 10 of the drain valve body during the adsorption process.

[0054] In this embodiment, the flexible body 6 is made of magnetic material, and magnetic rubber can be used to ensure magnetic conductivity.

[0055] In this embodiment, the clamp also includes a limiting structure, which includes a clamp 1 and a limiting sleeve 8. The clamp is fixed to the top of the connecting rod 11, and the limiting sleeve 8 is disposed on the top of the hard insulating sleeve and is sleeved outside the spring 7. The top of the limiting sleeve 8 is a certain distance from the bottom of the threaded sleeve 2.

[0056] The clamp 1 and the limiting sleeve 8 together limit the spring 7, ensuring that the stretching and compression of the spring 7 do not exceed its maximum limit.

[0057] In this embodiment, the limiting sleeve 8 is made of non-magnetic material, and the bridge 3 is made of non-magnetic material.

[0058] In this embodiment, scales are provided on the bridge 3 and the connecting rod 11 corresponding to the threaded sleeve 2, so that precise adjustment can be achieved through the scales.

[0059] The working principle is as follows: Existing ultrasonic thickness gauges require operators to hold the probe close to the pipeline during operation. This handheld operation introduces significant human error due to shaking or other factors, affecting measurement results and leading to low accuracy and poor stability. Therefore, this invention addresses the human error inherent in ultrasonic thickness gauges by designing an ultrasonic wall thickness measuring fixture suitable for natural gas station drain valves. This fixture holds the probe, ensuring a tight fit between the probe and the valve body during operation and allowing for normal use after removal from the hand. This results in more accurate and stable measurement results, thus guaranteeing the accuracy of the measurements.

[0060] Specifically, this invention uses the adsorption effect of the permanent magnet chuck 4 to fix the clamp to the outer wall of the valve body. The threaded sleeve is then adjusted to ensure a precise fit between the probe and the outer wall of the valve body, achieving hands-free measurement. After installing the clamp with the probe 9 as shown in the diagram, the permanent magnet chuck switch 5 is turned on, and the clamp and probe 9 are attached to the outer wall 10 of the valve body. The permanent magnet chuck 4 generates magnetic force, ensuring the clamp fits snugly against the outer wall 10. The rigid bridge 3 is fixedly connected to the permanent magnet chucks 4 at both ends. The threaded sleeve 2 and the rigid bridge 3 are connected via a threaded joint to transmit pressure to the spring 7, ensuring a tight fit between the probe 9 and the outer wall 10 of the valve body. The flexible body 6 is fixedly connected to the permanent magnet chuck 4, ensuring the clamp fits snugly against the outer wall of the valve body during the adsorption process. The clamp 1 and the limiting sleeve 8 limit the spring 7, ensuring that the tension and compression of the spring 7 do not exceed its maximum limit. Furthermore, the clamp can be adjusted via the threaded sleeve 2 to control the compression of the spring 7 and the initial position of the probe 9 before installation, ensuring a perfect fit between the probe 9 and pipes and valves of different sizes. After measurement, the permanent magnet chuck 4 is demagnetized using the permanent magnet chuck switch 5, and the clamp is removed for the next measurement.

[0061] Example 2

[0062] like Figure 2 , Figure 3 and Figure 4As shown, the difference between this embodiment and Embodiment 1 is that, based on the wall thickness reduction characteristics after the drain valve is disassembled, this embodiment provides an ultrasonic wall thickness detection method applicable to the drain valve body of a natural gas station; this method is applied to the detection and identification of risk points related to wall thickness reduction in DN50 drain valves; as shown... Figure 4 As shown, the method includes:

[0063] Step 1: Use two sheet metal plates to form a cylinder at the top and bottom of the drain valve body. Use a spirit level to ensure that the cylinder is parallel to the ground. The cylinder intersects with the drain valve body to form four base points. Mark these base points on the outer wall of the drain valve body using a ruler and a marker.

[0064] Step 2: Based on the aforementioned base points, an arc-shaped search method is used to determine three types of risk points: the first type of risk point, the second type of risk point, and the third type of risk point; and these risk points are used as wall thickness detection points.

[0065] This invention identifies nine key risk points: Point B1, Point B1-1, Point B1-2, Point 2, Point 2-1, Point 2-2, Point 3, Point 3-1, and Point 3-2. For example... Figure 2 As shown.

[0066] like Figure 3 As shown, the specific method for determining the four basic points is as follows: denoted as basic points ①, ②, ③, and ④.

[0067] The first type of risk point: By finding the point on the line connecting the outer arc lengths of base points ① and ④, and being close to 1 / 6 of the length of ①, this point is identified as risk point Point_B1; the intersection of the horizontal arc where the outer arc connecting base points ① and ④ intersects with the horizontal arc where the outer arc of base points ② and ③ intersects with the vertical arc where risk point Point_B1 is located is identified as risk point Point_B1-2; the midpoint of the outer arcs of risk points Point_B1 and risk point Point_B1-2 is identified as risk point Point_B1-1;

[0068] The second type of risk point: by finding the intersection of the outer wall arcs of base points ① and ④ with the outer wall arcs of ② and ③, the risk point Point_B 2-2 is identified; the midpoint of the outer wall arcs of base points ① and ④ is identified as risk point Point_B 2; the midpoint of the outer wall arcs of risk point Point_B 2 and risk point Point_B 2-2 is identified as risk point Point_B 2-1.

[0069] The third type of risk point: by finding the point on the line connecting the outer arc lengths of base points ② and ③, and being close to 1 / 4 of the length of ③, this point is identified as risk point Point_B 3; the midpoint of the outer arc connecting base points ③ and ④ is identified as risk point Point_B 3-2; and the midpoint of the outer arc connecting risk points Point_B 3 and Point_B 3-2 is identified as risk point Point_B 3-1.

[0070] Figure 3 The 7.4mm in the middle is the dimension of the upper surface of the valve body; 2.7.4mm, 4.0mm, and 4.3mm are the distances between each detection point.

[0071] Step 3: Use an ultrasonic wall thickness testing fixture to attach a fixed electromagnetic probe to the drain valve body to detect the valve wall thickness loss at the testing point. If necessary, the valve can be replaced to prevent leakage accidents. The ultrasonic wall thickness testing fixture is the ultrasonic wall thickness testing fixture for natural gas station drain valve bodies described in Example 1.

[0072] This invention is based on Figure 2 , Figure 3 The method shown describes how to determine the wall thickness detection point on the outer wall of the valve body. The probe is then attached to the determined detection point on the valve body using a permanent magnet chuck, and connected to a power source. Key parameters such as sound velocity are adjusted. Finally, the wall thickness is measured using the probe.

[0073] In practice, in January 2021, wall thickness testing was applied at some gas transmission stations. The test data is shown in Table 1, which shows that the accuracy can be controlled at over 83%.

[0074] Table 1. Field Test Results

[0075]

[0076]

[0077] The test results above show that the wall thickness detection experiment conducted using the method of this invention at a natural gas transmission station involved 76 valves. The actual wall thickness loss was measured after the equipment was disassembled and removed from the process area during maintenance, and the valves were cut open. The detection accuracy reached over 83% (error less than 17%). Compared to existing technologies where the risk points of leaks in the drain valves of natural gas transmission stations are difficult to detect and determine, with an identification accuracy of only 20%–30%, the detection accuracy of the method of this invention is significantly improved.

[0078] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An ultrasonic wall thickness detection method applicable to the body of a sewage valve in a natural gas station, characterized in that, This method is applied to the detection and identification of risk points related to wall thinning in DN50 drain valves; the method includes: Step 1: Use two sheet metal plates to form a cylinder at the top and bottom of the drain valve body. Use a spirit level to ensure that the cylinder is parallel to the ground. The cylinder intersects with the drain valve body to form four base points. Mark these base points on the outer wall of the drain valve body using a ruler and a marker. Step 2: Based on the aforementioned base points, an arc-shaped search method is used to obtain three types of risk points: the first type of risk point, the second type of risk point, and the third type of risk point; and these risk points are used as wall thickness detection points. Step 3: Use an ultrasonic wall thickness testing fixture to attach a fixed electromagnetic probe to the valve body of the drain valve and perform valve wall thickness testing at the testing point; wherein, the ultrasonic wall thickness testing fixture is an ultrasonic wall thickness testing fixture suitable for the drain valve body of a natural gas station. The aforementioned arc-shaped search method yields three types of risk points; specifically including: Based on their distribution, the four base points are designated as the top-left base points. Lower left base point Top right base point Bottom right base point ; First type of risk point: By finding the top left base point Bottom right base point The outer wall arc length line is close to the upper left base point. At 1 / 6 of the distance, this is designated as the risk point Point_B1; the top left base point Bottom right base point Connecting the outer wall arc and the lower left base point Top right base point The horizontal arc where the intersection of the outer wall arcs is located, and the intersection of the horizontal arc with the vertical arc where risk point Point_B1 is located, are designated as risk point Point_B1-2; the midpoint of the outer wall arcs of risk point Point_B1 and risk point Point_B1-2 are designated as risk point Point_B1-1; Second type of risk point: By finding the top left base point Bottom right base point The outer wall curve and the lower left base point Top right base point The intersection of the outer wall arcs is designated as risk point Point_B 2-2; upper left base point Bottom right base point The midpoint of the outer wall arc is designated as risk point Point_B2; the midpoint of the outer wall arc between risk point Point_B2 and risk point Point_B2-2 is designated as risk point Point_B2-1. The third type of risk point: By finding the lower left base point Top right base point The outer wall arc length line is close to the upper right base point. At 1 / 4 of the distance, designate it as the risk point Point_B3; designate the upper right base point... Bottom right base point The midpoint of the connecting outer wall arc is designated as risk point Point_B 3-2; the midpoint of the outer wall arc connecting risk point Point_B 3 and risk point Point_B 3-2 is designated as risk point Point_B 3-1. The ultrasonic wall thickness testing fixture for the valve body of the applicable natural gas station sewage valve includes a bridge (3) and a connecting rod (11). The bridge (3) is fixedly connected to an adsorption structure on both sides downwards. The connecting rod (11) is perpendicularly intersecting the bridge (3). The upper part of the connecting rod (11) is provided with an adjustment structure. The middle part of the connecting rod (11) is provided with a telescopic component. The bottom of the connecting rod (11) is externally connected to a probe (9). The connecting rod (11) drives the probe (9) to slide left and right along the bridge (3) through the adjustment structure. The clamp is fixed to the outer wall (10) of the drain valve body by the adsorption structure, and the adjustment structure can control the probe connected to the bottom of the connecting rod (11) to be tightly connected to the outer wall of the drain valve body.

2. The ultrasonic wall thickness detection method for the valve body of a natural gas station sewage valve according to claim 1, characterized in that, The adjustment structure includes a threaded sleeve (2) and a spring (7). The threaded sleeve (2) is located on the upper part of the connecting rod (11). The threaded sleeve (2) is connected to the bridge (3) through a threaded pair. The bottom of the threaded sleeve (2) is connected to the spring (7). The spring (7) is wound around the connecting rod (11), and the bottom of the spring (7) is connected to a probe (9) through a hard insulating sleeve. The probe is adjusted to fit tightly against the outer wall (10) of the drain valve body by moving the threaded sleeve (2) up and down. The upper outer wall of the connecting rod (11) is provided with threads that cooperate with the threaded sleeve (2).

3. The ultrasonic wall thickness detection method for the valve body of a natural gas station sewage valve according to claim 1, characterized in that, The adsorption structure includes a permanent magnet chuck (4) and a permanent magnet chuck switch (5). The permanent magnet chuck (4) is equipped with a permanent magnet chuck switch (5). The permanent magnet chuck (4) is opened or closed to control whether the permanent magnet chuck (4) generates magnetic force, thereby controlling whether the clamp is attached to the outer wall (10) of the drain valve body.

4. The ultrasonic wall thickness detection method for the valve body of a natural gas station sewage valve according to claim 3, characterized in that, The adsorption structure also includes a flexible body (6), which is fixedly connected to the permanent magnet chuck (4) to ensure that the clamp fits against the outer wall (10) of the drain valve during the adsorption process.

5. The ultrasonic wall thickness detection method for the valve body of a natural gas station sewage valve according to claim 4, characterized in that, The flexible body (6) is made of magnetic material.

6. The ultrasonic wall thickness detection method for the valve body of a natural gas station sewage valve according to claim 2, characterized in that, The clamp also includes a limiting structure, which includes a clamp (1) and a limiting sleeve (8). The clamp is fixed to the top of the connecting rod (11), and the limiting sleeve (8) is located on the top of the hard insulating sleeve and is sleeved outside the spring (7). The top of the limiting sleeve (8) is a certain distance from the bottom of the threaded sleeve (2). The clamp (1) and the limiting sleeve (8) together limit the spring (7) to ensure that the stretching and compression of the spring (7) does not exceed its maximum limit.

7. The ultrasonic wall thickness detection method for the valve body of a sewage valve in a natural gas station according to claim 6, characterized in that, The limiting sleeve (8) is made of non-magnetic material, and the bridge (3) is made of non-magnetic material.

8. The ultrasonic wall thickness detection method for the valve body of a natural gas station sewage valve according to claim 2, characterized in that, The bridge (3) and the connecting rod (11) corresponding to the threaded sleeve (2) are both provided with scales, which can be used to achieve precise adjustment.

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