Needle valve body orifice wall thickness measurement method, device and readable storage medium

Abstract

The application discloses a nozzle hole wall thickness measurement method and device of a needle valve body and a readable storage medium. The method comprises the following steps: acquiring a first cross section and a second cross section of a measured needle valve body; determining a first projection line segment length of the first cross section and a second projection line segment length of the second cross section; determining an axial perpendicular distance of the first cross section and the second cross section; and determining the nozzle hole wall thickness of the measured needle valve body according to the first projection line segment length, the second projection line segment length, the axial perpendicular distance and a preset angle. The application solves the technical problems of great difficulty and low measurement accuracy of the nozzle hole wall thickness measurement of the needle valve body in the related art.

Description

Technical Field

[0001] This application relates to the field of precision component dimension inspection technology, and more specifically, to a method, apparatus and readable storage medium for measuring the wall thickness of the nozzle of a needle valve body. Background Technology

[0002] The needle valve body is a core precision component of the fuel injection system, and its nozzle wall thickness directly affects the atomization effect and fatigue life. In related technologies, the nozzle wall thickness of the needle valve body can be detected by conventional contact methods, optical methods, and molding with adhesive, or by using a laser profilometer combined with an industrial camera for three-dimensional reconstruction. However, the above methods still have technical problems such as high measurement difficulty and low measurement accuracy.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This application provides a method, apparatus, and readable storage medium for measuring the nozzle wall thickness of a needle valve body, so as to at least solve the technical problems of high difficulty and low accuracy in measuring the nozzle wall thickness of needle valve bodies in related technologies.

[0005] According to one aspect of the embodiments of this application, a method for measuring the nozzle wall thickness of a needle valve body is provided, comprising: acquiring a first cross-section and a second cross-section of the needle valve body to be measured, wherein the first cross-section is located on an outer conical surface at a preset angle, and the second cross-section is located on an inner conical surface at a preset angle, and both the first cross-section and the second cross-section are perpendicular to the conical axis of the needle valve body to be measured; determining the length of a first projection line segment of the first cross-section and the length of a second projection line segment of the second cross-section, wherein the length of the first projection line segment is used to represent the cross-sectional diameter of the outer conical surface, and the length of the second projection line segment is used to represent the cross-sectional diameter of the inner conical surface; determining the axial vertical distance between the first cross-section and the second cross-section; and determining the nozzle wall thickness of the needle valve body to be measured based on the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance, and the preset angle.

[0006] Optionally, determining the axial vertical distance between the first cross section and the second cross section includes: measuring the first axial vertical distance of the standard needle valve body and the second axial vertical distance of the needle valve body under test, wherein the axial vertical distance of the standard needle valve body is a preset value; determining the measurement difference between the first axial vertical distance measurement value and the second axial vertical distance measurement value; and determining the axial vertical distance based on the preset value and the measurement difference.

[0007] Optionally, the nozzle wall thickness of the needle valve body under test is determined based on the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance, and the preset angle, including: determining the length difference between the length of the first projection line segment and the length of the second projection line segment; and determining the nozzle wall thickness of the needle valve body under test based on the preset trigonometric function relationship, the length difference, the axial vertical distance, and the preset angle.

[0008] Optionally, the first and second sections cover the axial projection range of the nozzle.

[0009] Optionally, the axial vertical distance is less than the machining depth of the nozzle.

[0010] According to one aspect of the present application, a device for measuring the nozzle wall thickness of a needle valve body is provided for performing the above-described method for measuring the nozzle wall thickness of a needle valve body. The device includes: a clamping body (1), an upper pressure head (2), a positioning shaft (3), and a needle valve body (4) to be measured. The upper pressure head (2) is mounted on the clamping body (1), the positioning shaft (3) is mounted on the clamping body (1), the outer circle of the needle valve body (4) to be measured is inserted into the clamping body (1), and the inner conical surface of the needle valve body (4) to be measured is in contact with the conical surface of the positioning shaft (3).

[0011] Optionally, the intersection line between the first preset angle cone surface of the upper pressure head (2) and the inner hole of the upper pressure head (2) is used to simulate the first projection line segment, and the length of the first projection line segment is used to represent the cross-sectional diameter of the outer cone surface of the needle valve body (4) being tested.

[0012] Optionally, the intersection line between the second preset angle cone surface of the positioning shaft (3) and the outer circle of the needle valve body (4) under test is used to simulate the second projection line segment, and the length of the second projection line segment is used to represent the cross-sectional diameter of the inner cone surface of the needle valve body (4) under test.

[0013] According to another aspect of the embodiments of this application, a nozzle wall thickness measurement system for a needle valve body is also provided, comprising: an acquisition module for acquiring a first cross-section and a second cross-section of the needle valve body to be measured, wherein the first cross-section is located on an outer conical surface at a preset angle, the second cross-section is located on an inner conical surface at a preset angle, and both the first and second cross-sections are perpendicular to the conical axis of the needle valve body to be measured; a first determination module for determining the length of a first projection line segment of the first cross-section and the length of a second projection line segment of the second cross-section, wherein the length of the first projection line segment is used to represent the cross-sectional diameter of the outer conical surface, and the length of the second projection line segment is used to represent the cross-sectional diameter of the inner conical surface; a second determination module for determining the axial vertical distance between the first and second cross-sections; and a third determination module for determining the nozzle wall thickness of the needle valve body to be measured based on the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance, and the preset angle.

[0014] Optionally, the second determining module is further configured to: measure a first axial vertical distance measurement value of a standard needle valve body and a second axial vertical distance measurement value of the needle valve body under test, wherein the axial vertical distance of the standard needle valve body is a preset value; determine the measurement difference between the first axial vertical distance measurement value and the second axial vertical distance measurement value; and determine the axial vertical distance based on the preset value and the measurement difference.

[0015] Optionally, the third determining module is also used to: determine the length difference between the length of the first projection line segment and the length of the second projection line segment; and determine the nozzle wall thickness of the needle valve body under test based on the preset trigonometric function relationship, the length difference, the axial vertical distance, and the preset angle.

[0016] Optionally, the first and second sections cover the axial projection range of the nozzle.

[0017] Optionally, the axial vertical distance is less than the machining depth of the nozzle.

[0018] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored executable program, wherein, when the executable program is running, it controls the device where the computer-readable storage medium is located to perform the methods of various embodiments of this application.

[0019] According to another aspect of the embodiments of this application, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the methods in various embodiments of this application.

[0020] In this embodiment, a method for detecting the nozzle wall thickness of a needle valve body based on relative measurement of standard parts is adopted. This method involves acquiring a first cross-section and a second cross-section of the needle valve body under test. The first cross-section is located on an outer conical surface at a preset angle, and the second cross-section is located on an inner conical surface at a preset angle. Both the first and second cross-sections are perpendicular to the conical axis of the needle valve body. Then, the lengths of the first and second projected line segments of the first and second cross-sections are determined. The first projected line segment length represents the diameter of the outer conical surface, and the second projected line segment length represents the diameter of the inner conical surface. Next, the axial perpendicular distance between the first and second cross-sections is determined. Finally, the nozzle wall thickness of the needle valve body is determined based on the lengths of the first and second projected line segments, the axial perpendicular distance, and the preset angle. This method achieves the goal of measuring the nozzle wall thickness using simple geometric relationships, thus realizing the technical effect of rapid and accurate measurement of the nozzle position wall thickness. This solves the technical problems of high difficulty and low accuracy in measuring the nozzle wall thickness of needle valve bodies in related technologies. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a schematic diagram of an optional nozzle wall thickness for a needle valve body in the prior art;

[0023] Figure 2This is a schematic diagram illustrating the principle of the needle valve body nozzle wall thickness measurement method according to an embodiment of this application;

[0024] Figure 3 This is a flowchart of a method for measuring the nozzle wall thickness of a needle valve body according to an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of a nozzle wall thickness measuring device for a needle valve body according to an embodiment of this application;

[0026] Figure 5 This is a structural block diagram of a nozzle wall thickness measurement system for a needle valve body according to an embodiment of this application. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] As a core precision component of the engine fuel injection system, the thickness of the nozzle wall directly determines the fuel atomization effect, engine performance, and fatigue life. Due to the nozzle depth of approximately 40mm and the minimum orifice diameter of only 0.9mm, it is difficult to quickly and accurately detect the wall thickness of this deep cavity micro-orifice before processing. Insufficient wall thickness can easily lead to high-pressure cracking, while excessive wall thickness can affect injection performance.

[0030] Most related testing technologies use the injection curing method, which can reflect the internal structure, but it has the risks of measurement deviation due to glue shrinkage, lengthy and inefficient process, easy deformation of the glue mold, and contamination of consumables. Another technology uses a laser profilometer for three-dimensional reconstruction, but it is limited by the large number of measurement blind spots caused by deep cavity optical obstruction, and the algorithm has a large amount of computation, expensive equipment, and difficult debugging and maintenance, making it difficult to meet the production line cycle time. Conventional contact or optical methods are difficult to directly measure the intersection of conical surfaces, while industrial computed tomography (CT) has high accuracy but high cost and time consumption, and is only suitable for R&D arbitration.

[0031] Figure 1 This is a schematic diagram of an optional needle valve body nozzle wall thickness in the prior art, such as... Figure 1 As shown, the nozzle of the needle valve body is located relatively deep, with a depth of approximately 40mm, and the diameter is small, with the smallest diameter being only about 0.9mm. Figure 1 The dimension h of the nozzle wall thickness is marked. This wall thickness refers to the dimension perpendicular to the 30-degree conical surface formed by the inner 30-degree conical hole and the outer 30-degree conical surface. Due to the depth of the nozzle structure and the small diameter of the hole, this wall thickness is difficult to measure directly using conventional methods. However, its value directly affects the nozzle length, fuel injection effect, and overall engine performance, making it a key parameter that needs to be checked before the needle valve body is machined.

[0032] Figure 2 This is a schematic diagram illustrating the principle of the needle valve body nozzle wall thickness measurement method according to an embodiment of this application, as shown below. Figure 2 As shown. Figure 2 In this measurement, the outer conical surface and inner conical hole of the needle valve body constitute the structure to be measured, and its wall thickness h is defined as the dimension perpendicular to the axis of the conical surface. For measurement purposes, two reference sections are selected on a plane perpendicular to the axis of the conical surface. Specifically, taking a preset angle of 30 degrees as an example, a section perpendicular to the axis of the conical surface is selected on the outer 30° conical surface. This section intersects the generatrix of the outer 30° conical surface at points P and A. The projection line of this section is denoted as line segment PA, and the length of line segment PA is the diameter of the outer conical surface section, denoted as parameter a. A section perpendicular to the axis of the conical surface is selected on the inner 30° conical surface. This section intersects the generatrix of the inner 30° conical surface at points Q and E. The projection line of this section is denoted as line segment QE, and the length of line segment QE is the diameter of the inner conical surface section, denoted as parameter b. The conical surfaces represented by line segments PA and QE are the two reference planes for measurement.

[0033] According to an embodiment of this application, a method embodiment for measuring the wall thickness of the nozzle orifice of a needle valve body is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0034] Figure 3 This is a flowchart of a method for measuring the nozzle wall thickness of a needle valve body according to an embodiment of this application, as follows: Figure 3 As shown, the method includes:

[0035] Step S31: Obtain the first cross section and the second cross section of the needle valve body under test, wherein the first cross section is located on the outer conical surface at a preset angle, the second cross section is located on the inner conical surface at a preset angle, and both the first cross section and the second cross section are perpendicular to the conical axis of the needle valve body under test.

[0036] Step S32: Determine the length of the first projection line segment of the first cross section and the length of the second projection line segment of the second cross section, wherein the length of the first projection line segment is used to represent the cross section diameter of the outer conical surface and the length of the second projection line segment is used to represent the cross section diameter of the inner conical surface;

[0037] Step S33: Determine the axial vertical distance between the first cross section and the second cross section;

[0038] Step S34: Determine the nozzle wall thickness of the needle valve body under test based on the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance, and the preset angle.

[0039] The aforementioned needle valve body refers to a needle valve body workpiece that requires nozzle wall thickness measurement but has not yet had its nozzles machined. During the measurement process, the outer and inner conical surfaces of the needle valve body remain intact and unmachined. The upper pressure head and positioning shaft of a special measuring fixture contact the outer and inner conical surfaces of the needle valve body respectively to simulate and determine the reference section required for measurement, thereby achieving non-destructive and rapid detection of the nozzle position wall thickness.

[0040] The aforementioned first cross-section refers to the cross-section located on the outer conical surface at a preset angle and perpendicular to the axis of the conical surface of the valve body being tested, i.e. Figure 2 The section containing line segment PA is shown in the diagram. During the measurement process, the first section is simulated by the contact between the inner hole of the upper pressure head of the measuring fixture and the outer conical surface. The projection line of this section is the first projection line segment, and its length is used to represent the diameter of the outer conical surface.

[0041] The second section mentioned above refers to the section located on the inner conical surface at a preset angle and perpendicular to the axis of the conical surface of the valve body being tested, i.e. Figure 2 The section containing line segment DE. During the measurement process, the second section is simulated by the contact between the positioning shaft cone surface and the inner cone surface of the measuring fixture. The projection line of this section is the second projection line segment, and its length is used to represent the diameter of the inner cone surface.

[0042] The aforementioned preset angle represents the design cone angle between the outer and inner cone surfaces of the needle valve body. In this embodiment, 30 degrees is used as an example, but other angles are also possible. This angle is a key parameter for determining the vertical direction of the measurement reference section and for performing geometric conversion of wall thickness. When calculating the wall thickness, its half-angle value is used for trigonometric function calculations to convert the difference in cross-sectional diameter and the axial vertical distance into the nozzle wall thickness dimension perpendicular to the cone surface.

[0043] The aforementioned outer conical surface refers to the conical surface outside the needle valve body, with a cone angle that is a preset angle, for example... Figure 2 The outer 30-degree conical surface is used in the measurement process. The outer conical surface is the basic surface for determining the position of the first cross-section. The inner hole of the upper pressure head of the measuring fixture contacts the outer conical surface to simulate the first cross-section, thereby obtaining the length of the first projected line segment used to represent the diameter of the outer conical surface cross-section.

[0044] The aforementioned inner conical surface refers to the conical surface inside the needle valve body, with a cone angle that is a preset angle, for example... Figure 2 The inner 30-degree conical surface is used in the measurement process. The inner conical surface is the basic surface for determining the position of the second section. The positioning shaft conical surface of the measuring fixture contacts the inner conical surface to simulate the second section, thereby obtaining the length of the second projected line segment used to represent the diameter of the inner conical surface section.

[0045] The aforementioned length of the first projection line segment represents the projected length of the first cross-section in the measurement direction, and is used to represent the cross-sectional diameter of the outer conical surface, i.e. Figure 2 The length of line segment PA in the figure is represented by parameter a. During the measurement process, this length is determined by the diameter of the contact point between the inner hole of the upper pressure head and the outer conical surface of the measuring fixture.

[0046] The length of the second projection line segment mentioned above represents the projected length of the second cross section in the measurement direction, and is used to represent the cross-sectional diameter of the inner cone surface, i.e. Figure 2 The length of line segment QE in the figure is represented by parameter b. During the measurement process, this length is determined by the diameter of the contact point between the positioning shaft cone surface and the inner cone surface of the measuring fixture.

[0047] The aforementioned axial perpendicular distance represents the distance between the first section and the second section in the direction perpendicular to the axis of the needle valve body's conical surface. Specifically, the axial perpendicular distance is the axial distance between the plane containing the first projection line segment and the plane containing the second projection line segment, i.e. Figure 2 The length of line segment DE in the figure is represented by parameter c. This distance is obtained by measuring the relative difference between the valve body being tested and the standard part using a sensor.

[0048] The aforementioned nozzle wall thickness refers to the wall thickness dimension perpendicular to the nozzle axis of the needle valve body. Specifically, it refers to the dimension perpendicular to the axis of the conical surface formed by the inner preset angle conical hole and the outer conical surface. Figure 1The dimension h is indicated in the figure. This dimension is a key quality indicator for evaluating whether the needle valve body will crack and fail under high-pressure fuel and the fuel injection atomization effect.

[0049] In step S31, when obtaining the first and second cross-sections of the valve body under test, before the nozzles are machined, the first cross-section is determined by the contact between the inner hole of the upper pressure head of the measuring fixture and the outer conical surface. The second cross-section is determined by the contact between the conical surface of the positioning shaft and the inner conical surface. It is ensured that both the first and second cross-sections are perpendicular to the conical axis of the valve body under test, thereby determining the positions of the two reference cross-sections for measurement.

[0050] In step S32, when determining the length of the first projected line segment of the first cross-section and the length of the second projected line segment of the second cross-section, the diameters of the first and second cross-sections are obtained by measuring the structural dimensions of the tooling. The diameter of the first cross-section is used as the length of the first projected line segment, and the diameter of the second cross-section is used as the length of the second projected line segment. The length of the first projected line segment represents the diameter of the outer conical surface, and the length of the second projected line segment represents the diameter of the inner conical surface.

[0051] In step S33, when determining the axial vertical distance between the first cross section and the second cross section, the position difference between the first cross section and the second cross section in the axial direction is first measured using a sensor. Then, the axial vertical distance between the first cross section and the second cross section of the needle valve body under test is obtained by relative measurement with a standard part with a known axial vertical distance, thereby obtaining the specific value of the axial vertical distance.

[0052] In step S34, when determining the nozzle wall thickness of the needle valve body to be tested, the obtained first projection line segment length, second projection line segment length, axial vertical distance and preset angle are substituted into the preset geometric calculation formula. Through trigonometric function calculation, the nozzle wall thickness of the needle valve body to be tested is determined according to the first projection line segment length, second projection line segment length, axial vertical distance and preset angle, thereby completing the calculation of the wall thickness.

[0053] Based on the above steps S31 to S34, this application embodiment adopts a needle valve body nozzle wall thickness detection method based on standard part relative measurement. By acquiring the first cross section and the second cross section of the needle valve body to be measured, wherein the first cross section is located on the outer conical surface at a preset angle, and the second cross section is located on the inner conical surface at a preset angle, and both the first cross section and the second cross section are perpendicular to the conical surface axis of the needle valve body to be measured, the length of the first projection line segment of the first cross section and the length of the second projection line segment of the second cross section are determined, wherein the length of the first projection line segment is used to represent the cross section diameter of the outer conical surface, and the length of the second projection line segment is used to represent the cross section diameter of the inner conical surface. Then, the axial vertical distance between the first cross section and the second cross section is determined. Finally, the nozzle wall thickness of the needle valve body to be measured is determined according to the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance and the preset angle. This achieves the purpose of measuring the nozzle wall thickness using simple geometric relationships, thereby realizing the technical effect of rapid and accurate measurement of the nozzle position wall thickness, and thus solving the technical problems of high difficulty and low measurement accuracy in measuring the nozzle wall thickness of needle valve bodies in related technologies.

[0054] Optionally, determining the axial vertical distance between the first cross section and the second cross section includes: measuring the first axial vertical distance of the standard needle valve body and the second axial vertical distance of the needle valve body under test, wherein the axial vertical distance of the standard needle valve body is a preset value; determining the measurement difference between the first axial vertical distance measurement value and the second axial vertical distance measurement value; and determining the axial vertical distance based on the preset value and the measurement difference.

[0055] The aforementioned standard needle valve body refers to a needle valve body workpiece with known geometric parameters and a preset axial vertical distance, which serves as a calibration reference for establishing a measurement standard.

[0056] The aforementioned first axial vertical distance measurement value represents the actual reading recorded by the sensor in the direction perpendicular to the cone axis when the standard needle valve body is in its standard installation state within the measuring fixture. During the measurement process, the standard needle valve body is inserted into the measuring fixture, with its outer cone surface in contact with the upper pressure head of the fixture and its inner cone surface in contact with the positioning shaft of the fixture. The value output by the sensor at this time is the first axial vertical distance measurement value. This value reflects the geometric position of the standard needle valve body under the system reference and serves as a reference value for relative measurement, used for subsequent comparison and calculation with the measurement values ​​of the workpiece to be measured.

[0057] The aforementioned second axial vertical distance measurement value represents the actual reading recorded by the sensor in the direction perpendicular to the cone axis when the tested needle valve body is in the measured installation state within the measuring fixture. During the measurement process, the tested needle valve body is installed in the measuring fixture, with its outer cone surface in contact with the upper pressure head of the measuring fixture and its inner cone surface in contact with the positioning shaft of the measuring fixture. At this time, the value output by the sensor is the second axial vertical distance measurement value. This value reflects the relative geometric position of the tested needle valve body under the system reference and serves as the data to be measured for relative measurement, used for comparison and calculation with the measured value of a standard needle valve body.

[0058] The aforementioned preset value represents the theoretical axial vertical distance between the first cross-section of the outer conical surface and the second cross-section of the inner conical surface of the standard needle valve body, under a defined geometric design. This value is a known and fixed reference value, representing the true dimensional state of the standard needle valve body under ideal geometric conditions. During the measurement process, the preset value serves as a calculation reference, used to calculate the difference between the first and second axial vertical distance measurements, thereby deriving the true axial vertical distance of the measured needle valve body.

[0059] The aforementioned measurement difference represents the numerical difference between the first axial vertical distance measurement value of the standard needle valve body and the second axial vertical distance measurement value of the needle valve body under test. During the measurement process, this difference reflects the deviation of the needle valve body under test relative to the standard needle valve body in axial vertical distance, and is a key intermediate variable connecting the known reference and the object under test.

[0060] by Figure 2 For example, draw a perpendicular line from point E to line segment PA, with the foot of the perpendicular at point D. The length of line segment DE is the axial perpendicular distance between the two cross-sections, denoted as parameter c. Line CE is the generatrix of the inner 30° cone. Line PA intersects the generatrix of the inner 30° cone at point C. Points C, D, and E form a right triangle CDE, where ∠CED = 15°, which is half the angle of the inner 30° cone. Line segment DE represents the axial perpendicular distance between the two reference planes, which can be measured using a sensor.

[0061] Since it is difficult for the sensor to quickly and directly measure the actual length of line segment DE, i.e., parameter c, a needle valve body with known parameter c is used as a standard for relative measurement. The sensor only needs to measure the difference in parameter c between the needle valve body being measured and the standard needle valve body to obtain the actual parameter c of the needle valve body being measured.

[0062] Specifically, in determining the axial vertical distance between the first and second cross sections, this embodiment first measures the first axial vertical distance of the standard needle valve body and the second axial vertical distance of the needle valve body under test. Exemplarily, the standard needle valve body is installed in a measuring fixture, with its outer conical surface in contact with the pressure head on the fixture and its inner conical surface in contact with the fixture's positioning shaft. At this time, the sensor records the first axial vertical distance measurement of the standard needle valve body. This measurement includes the true parameter c of the standard needle valve body (i.e., a preset value) and the system errors generated by the measurement system, such as sensor zero-point drift and fixture repeatability errors. This step establishes a reference point for measurement using a standard component with known geometric parameters. Next, the standard needle valve body is removed, and the needle valve body under test is installed in the same measuring fixture, with its outer conical surface in contact with the pressure head on the fixture and its inner conical surface in contact with the fixture's positioning shaft. At this time, the sensor records the second axial vertical distance measurement of the needle valve body under test. This measurement includes the true parameter c of the needle valve body under test (i.e., the axial vertical distance to be determined) and the same system errors. This step obtains the relative position data of the workpiece under test relative to the same reference.

[0063] Next, the measurement difference between the first and second axial vertical distance measurements is determined. For example, the measurement difference between the first and second axial vertical distance measurements is calculated. Since the same tooling and sensor are used in both measurements, the system error remains essentially consistent in both measurements; therefore, the system errors cancel each other out when calculating the difference. The measurement difference reflects the true geometric difference between the standard needle valve body and the measured needle valve body in the axial vertical distance.

[0064] Finally, the axial vertical distance is determined based on the preset value and the measurement difference. This involves calculating the axial vertical distance between the first and second cross-sections by comparing the measurement difference with the preset value of the standard needle valve body. For example, given the preset value of the axial vertical distance of the standard needle valve body, the true parameter c of the tested needle valve body can be calculated using the formula: Axial vertical distance of the tested needle valve body = Preset value - Measurement difference, or by adding or subtracting depending on the specific installation direction and the coordinate system definition. This step utilizes the principle of relative measurement, obtaining the true axial vertical distance of the tested needle valve body through difference conversion, avoiding the accuracy loss caused by directly measuring minute depths.

[0065] Based on the above optional embodiments, this application embodiment introduces a standard needle valve body for relative measurement. The axial vertical distance between the first cross section and the second cross section is indirectly determined by using the preset value of the standard needle valve body and the difference between the first axial vertical distance measurement value of the standard needle valve body and the second axial vertical distance measurement value of the measured needle valve body. This solves the technical problem that the sensor is difficult to directly and accurately measure the tiny axial distance between two cross sections in a deep cavity micro-hole, improves the measurement accuracy and repeatability of the axial vertical distance, and thus improves the accuracy of the needle valve body nozzle wall thickness calculation result, realizing rapid and accurate wall thickness prediction before nozzle processing.

[0066] Optionally, the nozzle wall thickness of the needle valve body under test is determined based on the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance, and the preset angle, including: determining the length difference between the length of the first projection line segment and the length of the second projection line segment; and determining the nozzle wall thickness of the needle valve body under test based on the preset trigonometric function relationship, the length difference, the axial vertical distance, and the preset angle.

[0067] The aforementioned length difference represents the numerical difference between the lengths of the first and second projected line segments, i.e., the difference between parameter a and parameter b. This difference reflects the radial dimensional deviation of the inner and outer conical surfaces at a selected cross-section.

[0068] The aforementioned preset trigonometric function relationship is based on the half angle of the conical surface inside the needle valve body, and is a trigonometric function formula used to mathematically convert the difference between the axial vertical distance, the length of the projected line segment, and the thickness of the nozzle wall.

[0069] In this embodiment of the application, when determining the nozzle wall thickness of the needle valve body to be tested, the length difference between the length of the first projection line segment and the length of the second projection line segment, i.e., ab, is first calculated. Then, the nozzle wall thickness of the needle valve body to be tested is determined based on the preset trigonometric function relationship, the length difference, the axial vertical distance and the preset angle.

[0070] For example, with Figure 2 For example, in right triangle CDE, according to trigonometric function relationships:

[0071] The length of line segment CD is:

[0072] The length of line segment AD is:

[0073] The length of line segment AC is the sum of the lengths of line segments AD and CD, that is:

[0074]

[0075] Draw a perpendicular line from point A to line segment CE, with the foot of the perpendicular at point B. The length of line segment AB is the wall thickness h at the nozzle location. In right triangle ABC, ∠CAB = 15°, which is half of the interior 30° cone angle. According to trigonometric relationships, the formula for calculating the wall thickness h is:

[0076]

[0077] After simplification, we get:

[0078] Therefore, the nozzle wall thickness h of the tested needle valve body can be directly calculated based on the actual parameters a, b, and c.

[0079] Based on the above optional embodiments, this application embodiment determines the length difference between the length of the first projection line segment and the length of the second projection line segment, and determines the nozzle wall thickness of the needle valve body to be measured based on the preset trigonometric function relationship, the length difference, the axial vertical distance and the preset angle. By using geometric trigonometric relationships, the vertical wall thickness, which is difficult to measure directly, is transformed into a combination calculation of the easily measurable axial distance and the length of the projection line segment. This achieves high-precision and rapid detection of minute wall thickness before nozzle processing, avoiding the problem of injector cracking and failure due to insufficient wall thickness or the impact of excessive wall thickness on fuel injection performance. It solves the defects of related technologies, such as high measurement difficulty and inability to predict in advance.

[0080] Optionally, the first and second sections cover the axial projection range of the nozzle.

[0081] The axial projection range of the aforementioned nozzle represents the axial interval occupied by the projection of the nozzle inside the needle valve body in the direction perpendicular to the axis of the conical surface. Since the nozzle has a specific depth and location, its axial projection range defines the area between the nozzle's starting and ending points in the axial direction.

[0082] This embodiment of the application ensures that the measurement reference plane covers the critical wall thickness area before the nozzle is processed by making the first and second cross sections cover the axial projection range of the nozzle. If the first and second cross sections do not cover the axial projection range of the nozzle, the calculated wall thickness may not accurately reflect the actual wall thickness at the nozzle location, resulting in a disconnect between the measurement results and the actual stress state of the nozzle, and making it impossible to effectively predict the wall thickness risk after nozzle processing.

[0083] Based on the above optional embodiments, this application embodiment ensures that the measurement reference plane can cover the critical wall thickness area before the nozzle is processed by making the first cross section and the second cross section cover the axial projection range of the nozzle. This avoids measurement blind spots or calculation deviations caused by improper selection of the reference plane, thereby ensuring that the nozzle wall thickness dimension calculated by the axial vertical distance and the length of the projected line segment can truly reflect the actual wall thickness at the nozzle position, and improves the effectiveness and reliability of the measurement results.

[0084] Optionally, the axial vertical distance is less than the machining depth of the nozzle.

[0085] The machining depth of the nozzle mentioned above represents the axial length of the nozzle on the needle valve body, extending from the outer surface to its inner depth, typically around 40 mm. This depth defines the axial extension range of the nozzle and is an important dimensional parameter in the structural design of the needle valve body.

[0086] This embodiment of the application ensures that the measurement reference surface used to calculate the wall thickness, i.e., the first section and the second section, is located in the unprocessed conical region of the nozzle entity by limiting the axial vertical distance to be less than the machining depth of the nozzle. If the axial vertical distance is greater than or equal to the machining depth of the nozzle, the measurement section may be located inside the nozzle or near the nozzle edge, resulting in an incomplete conical geometry, making it impossible to accurately simulate the theoretical conical generatrix, and thus causing distortion in the measurement of the projected line segment length.

[0087] Based on the above optional embodiments, this application embodiment ensures that the measurement reference surface is located in a complete conical area outside the nozzle solid material by limiting the axial vertical distance to less than the machining depth of the nozzle. This avoids problems such as incomplete geometry, sensor probe interference, or measurement reference failure caused by the measurement section being located inside or at the edge of the nozzle. As a result, the nozzle wall thickness calculated by the axial vertical distance and the length of the projected line segment has geometric validity and calculation accuracy, improving the reliability and validity of the measurement results.

[0088] For example, Figure 2 The outer 30° conical section represented by line segment PA should be located as high as possible on the outer conical surface, and the inner 30° conical section represented by line segment QE should be located as low as possible on the inner conical surface.

[0089] Figure 4 This is a schematic diagram of the nozzle wall thickness measuring device of the needle valve body according to an embodiment of this application, as shown below. Figure 4 As shown. The nozzle wall thickness measuring device is used to perform the above-mentioned nozzle wall thickness measuring method of the needle valve body, including: a clamping body (1), an upper pressure head (2), a positioning shaft (3) and a needle valve body (4) to be measured. The upper pressure head (2) is installed on the clamping body (1), the positioning shaft (3) is installed on the clamping body (1), the outer circle of the needle valve body (4) to be measured is inserted into the clamping body (1), and the inner conical surface of the needle valve body (4) to be measured is in contact with the conical surface of the positioning shaft (3).

[0090] The aforementioned clamp refers to the basic structure used to install and support other components of the measuring fixture. In the measuring device, it serves as a fixed carrier for the upper pressure head and positioning shaft, providing a stable measuring reference surface.

[0091] The aforementioned upper pressure head refers to a component mounted on the clamp body, with a contact surface of a specific geometry at its lower end. In this embodiment of the application, the upper pressure head may include a 90-degree conical surface, a 32-degree conical surface, and a high-precision hole with a diameter of A1, for contacting the outer conical surface of the valve body being measured, simulating the outer conical surface cross-section required for measurement.

[0092] The 90-degree conical surface represents the conical transition surface at the inlet of the inner hole, used to guide the valve body under test into the hole and for initial centering. The 32-degree conical surface represents the conical surface in the middle of the inner hole; its intersection with the cylindrical wall of the inner hole forms the first projection line segment, used to simulate the cross-sectional diameter of the outer conical surface. The high-precision hole represents a smooth cylindrical hole with strict dimensional tolerances at the bottom of the inner hole, used for stable contact with the outer conical surface of the valve body under test, ensuring the repeatability and stability of the contact position during measurement.

[0093] The aforementioned positioning shaft represents a component mounted on the fixture, whose surface has a conical structure for contacting the inner conical surface of the valve body being measured, simulating the inner conical cross-section required for measurement.

[0094] The outer circle mentioned above refers to the cylindrical surface portion of the valve body being tested, which is used to insert into the clamp body to provide initial positioning and support.

[0095] In this embodiment, the workpiece is initially positioned radially by inserting the outer circle of the valve body under test into the fixture. The inner conical surface of the valve body under test is brought into contact with the conical surface of the positioning shaft, and the cross-section of the inner conical surface is simulated using the conical surface of the positioning shaft, thus determining the measurement reference for the inner conical surface. The upper pressure head is mounted on the fixture, and its geometry is used to contact the outer conical surface, simulating the cross-section of the outer conical surface, thus determining the measurement reference for the outer conical surface.

[0096] Based on the above optional embodiments, this application embodiment achieves stable clamping and self-centering positioning of the needle valve body through the specific assembly relationship of the clamping body, the upper pressure head, the positioning shaft and the needle valve body under test, eliminating clamping errors, ensuring the positional accuracy of the outer conical cross section and the inner conical cross section, providing a reliable geometric basis for subsequent sensor measurement of axial vertical distance, and improving the repeatability and accuracy of the measurement.

[0097] Optionally, the intersection line between the first preset angle cone surface of the upper pressure head (2) and the inner hole of the upper pressure head (2) is used to simulate the first projection line segment, and the length of the first projection line segment is used to represent the cross-sectional diameter of the outer cone surface of the needle valve body (4) being tested.

[0098] The aforementioned first preset angle conical surface refers to a conical surface on the upper pressure head with a specific cone angle, which is one of the main geometric features of the upper pressure head that contacts the outer conical surface of the needle valve body. For example, in the embodiments of this application, the specific cone angle can be 32 degrees.

[0099] The aforementioned inner bore refers to a cylindrical or stepped channel extending axially inside the upper pressure head. For example, in the embodiments of this application, the inner bore may be composed of a 90-degree conical surface, a 32-degree conical surface, and a high-precision hole in sequence, used to guide and support the valve body of the probe being tested and to provide a precise bore diameter reference.

[0100] The aforementioned intersection line represents a linear edge formed by the intersection of two different geometric surfaces. In the embodiments of this application, the intersection line is an annular boundary formed by the intersection of the first preset angle cone surface of the upper pressure head and the inner hole sidewall of the upper pressure head, or an annular boundary formed by the intersection of the second preset angle cone surface of the positioning shaft and the outer cylindrical surface of the positioning shaft, i.e., the surface that contacts the outer circle of the valve body of the needle being measured.

[0101] The aforementioned first projection line segment represents the projection line segment formed by the intersection of the outer conical surface section perpendicular to the conical surface axis and the generatrix of the conical surface during measurement. It represents the diametrical dimension of the outer conical surface at a specific location. For example, the first projection line segment is... Figure 2 Line segment PA in the diagram.

[0102] This embodiment of the application simulates the first projected line segment by utilizing the intersection line between the first preset angle conical surface of the upper pressure head and the inner hole of the upper pressure head, transforming the abstract geometric cross-section into a concrete physical contact boundary. The intersection line between the first preset angle conical surface of the upper pressure head and the inner hole of the upper pressure head has a fixed geometric dimension, and the circumference diameter enclosed by this intersection line is the length of the first projected line segment. When the outer conical surface of the tested needle valve body contacts the upper pressure head, the contact position is determined by this intersection line, thereby transforming the fixed aperture size of the upper pressure head into the cross-sectional diameter parameter of the outer conical surface of the tested needle valve body.

[0103] Based on the above optional embodiments, this application embodiment uses the intersection line of the first preset angle cone surface of the upper pressure head and the inner hole of the upper pressure head to simulate the first projected line segment, and indirectly obtains the diameter of the outer cone surface section of the needle valve body under test by using the known geometric dimensions of the upper pressure head, avoiding the difficulty of directly measuring small diameter and high precision cone surface, and improving the accuracy and feasibility of dimension acquisition.

[0104] Optionally, the intersection line between the second preset angle cone surface of the positioning shaft (3) and the outer circle of the needle valve body (4) under test is used to simulate the second projection line segment, and the length of the second projection line segment is used to represent the cross-sectional diameter of the inner cone surface of the needle valve body (4) under test.

[0105] The aforementioned second preset angle conical surface refers to a conical surface with a specific cone angle on the positioning shaft. This surface is the main geometric feature on the positioning shaft that contacts the conical surface inside the valve body being tested.

[0106] The aforementioned outer circle refers to the cylindrical surface portion of the valve body being tested, with an outer diameter of A2. In the embodiments of this application, this outer circle surface mates with the tapered surface of the positioning shaft, providing radial support and positioning.

[0107] The second projection line segment mentioned above represents the projection line segment formed by the intersection of the inner conical surface section perpendicular to the conical surface axis and the generatrix of the conical surface during measurement. It represents the diametrical dimension of the inner conical surface at a specific location. For example, the second projection line segment is... Figure 2 The line segment QE in the middle.

[0108] This embodiment of the application simulates the second projected line segment by utilizing the intersection line between the second preset angle conical surface of the positioning shaft and the outer circle of the valve body under test. The intersection line between the second preset angle conical surface of the positioning shaft and the outer circle of the valve body under test has fixed geometric dimensions, and the circumference diameter enclosed by the intersection line is the length of the second projected line segment. When the valve body under test is installed on the positioning shaft, the inner conical surface of the valve body under test contacts the second preset angle conical surface of the positioning shaft, and the axial and radial coordinates of the contact position are determined by the intersection line. Therefore, the known geometric dimensions of the positioning shaft, i.e., the diameter of the intersection line, are mapped to the cross-sectional diameter parameter of the inner conical surface of the valve body under test, realizing the dimensional transfer from the standard part to the part under test.

[0109] Based on the above optional embodiments, this application embodiment simulates the second projected line segment by using the intersection line of the second preset angle cone surface of the positioning shaft and the outer circle of the needle valve body to be measured. The diameter of the inner cone surface section of the needle valve body to be measured is indirectly obtained by using the known geometric dimensions of the positioning shaft, avoiding the difficulty of directly measuring the inner cone surface size of the deep hole, and improving the accuracy and feasibility of size acquisition.

[0110] For example, with Figure 2 For example, the intersection of the 32° conical surface of the upper pressure head (2) and the inner hole is used to simulate the straight line PA in contact with the outer 30° conical surface, i.e., the diameter of the orifice is a. The intersection of the 32° conical surface of the positioning shaft (3) and the outer circle is used to simulate the straight line QE in contact with the inner 30° conical surface, i.e., the diameter of the positioning shaft is b. Then, the axial distance between PA and QE is measured by the sensor, i.e., the length c of the line segment DE. Then, the wall thickness h of the nozzle can be calculated according to the above calculation formula.

[0111] During measurement, the standard part is first used for calibration, and then the needle valve body (4) to be measured is placed on the positioning shaft (3). The diameter of the contact surface between the needle valve body (4) and the positioning shaft (3) is b. The upper pressure head (2) is moved so that the inner hole of the upper pressure head (2) contacts the outer 30° conical surface of the needle valve body (4) to be measured. The diameter of the contact surface is a. The difference between the position of the conical surface diameter b and the position of the conical surface diameter a relative to the standard part is measured by the sensor. Thus, the parameter c of the needle valve body to be measured can be obtained. Then, the nozzle wall thickness h can be obtained by calculation.

[0112] The contact section between the upper pressure head (2) and the outer 30-degree conical surface is the junction of the 32-degree conical surface of the upper pressure head (2) and the hole diameter a. The inner hole of the upper pressure head (2) consists first of a 90-degree conical surface, then a 32-degree conical surface, and finally a high-precision hole. The above design ensures both high-precision and high-repeatability self-centering positioning, as well as the stability of the contact line, eliminating installation errors. The design of the contact point between the positioning shaft (3) and the inner 30-degree conical surface also has the same function.

[0113] Figure 5 This is a structural block diagram of the nozzle wall thickness measurement system for the needle valve body according to an embodiment of this application, as shown below. Figure 5 As shown. The system includes:

[0114] The acquisition module 501 is used to acquire a first cross-section and a second cross-section of the needle valve body under test, wherein the first cross-section is located on an outer conical surface at a preset angle, and the second cross-section is located on an inner conical surface at a preset angle, and both the first and second cross-sections are perpendicular to the conical axis of the needle valve body under test; the first determination module 502 is used to determine the length of the first projection line segment of the first cross-section and the length of the second projection line segment of the second cross-section, wherein the length of the first projection line segment is used to represent the cross-sectional diameter of the outer conical surface, and the length of the second projection line segment is used to represent the cross-sectional diameter of the inner conical surface; the second determination module 503 is used to determine the axial vertical distance between the first cross-section and the second cross-section; and the third determination module 504 is used to determine the nozzle wall thickness of the needle valve body under test based on the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance, and the preset angle.

[0115] Optionally, the second determining module 503 is further configured to: measure the first axial vertical distance measurement value of the standard needle valve body and the second axial vertical distance measurement value of the needle valve body under test, wherein the axial vertical distance of the standard needle valve body is a preset value; determine the measurement difference between the first axial vertical distance measurement value and the second axial vertical distance measurement value; and determine the axial vertical distance based on the preset value and the measurement difference.

[0116] Optionally, the third determining module 504 is also used to: determine the length difference between the length of the first projection line segment and the length of the second projection line segment; and determine the nozzle wall thickness of the needle valve body under test based on the preset trigonometric function relationship, the length difference, the axial vertical distance and the preset angle.

[0117] Optionally, the first and second sections cover the axial projection range of the nozzle.

[0118] Optionally, the axial vertical distance is less than the machining depth of the nozzle.

[0119] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored executable program, wherein, when the executable program runs, it controls the device where the computer-readable storage medium is located to execute the nozzle wall thickness measurement method of the needle valve body of this application:

[0120] Obtain a first cross-section and a second cross-section of the needle valve body under test, wherein the first cross-section is located on the outer conical surface at a preset angle, and the second cross-section is located on the inner conical surface at a preset angle, and both the first and second cross-sections are perpendicular to the conical axis of the needle valve body under test; determine the length of the first projection line segment of the first cross-section and the length of the second projection line segment of the second cross-section, wherein the length of the first projection line segment is used to represent the cross-sectional diameter of the outer conical surface, and the length of the second projection line segment is used to represent the cross-sectional diameter of the inner conical surface; determine the axial vertical distance between the first and second cross-sections; determine the nozzle wall thickness of the needle valve body under test based on the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance, and the preset angle.

[0121] According to another aspect of the embodiments of this application, an electronic device is also provided, including a memory and a processor. The memory stores a computer program, and the processor is configured to run the computer program to perform the nozzle wall thickness measurement method of the needle valve body of this application.

[0122] Obtain a first cross-section and a second cross-section of the needle valve body under test, wherein the first cross-section is located on the outer conical surface at a preset angle, and the second cross-section is located on the inner conical surface at a preset angle, and both the first and second cross-sections are perpendicular to the conical axis of the needle valve body under test; determine the length of the first projection line segment of the first cross-section and the length of the second projection line segment of the second cross-section, wherein the length of the first projection line segment is used to represent the cross-sectional diameter of the outer conical surface, and the length of the second projection line segment is used to represent the cross-sectional diameter of the inner conical surface; determine the axial vertical distance between the first and second cross-sections; determine the nozzle wall thickness of the needle valve body under test based on the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance, and the preset angle.

[0123] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0124] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0125] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0126] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0127] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0128] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0129] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for measuring the wall thickness of the nozzle of a needle valve body, characterized in that, include: Obtain a first cross-section and a second cross-section of the valve body under test, wherein the first cross-section is located on the outer conical surface at a preset angle, and the second cross-section is located on the inner conical surface at the preset angle, and both the first cross-section and the second cross-section are perpendicular to the conical axis of the valve body under test; The length of the first projection line segment of the first cross section and the length of the second projection line segment of the second cross section are determined, wherein the length of the first projection line segment is used to represent the cross section diameter of the outer conical surface, and the length of the second projection line segment is used to represent the cross section diameter of the inner conical surface; Determine the axial vertical distance between the first cross section and the second cross section; The nozzle wall thickness of the needle valve body under test is determined based on the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance, and the preset angle.

2. The method according to claim 1, characterized in that, Determining the axial perpendicular distance between the first cross-section and the second cross-section includes: The first axial vertical distance measurement value of the standard needle valve body and the second axial vertical distance measurement value of the needle valve body under test are measured, wherein the axial vertical distance of the standard needle valve body is a preset value; Determine the measurement difference between the first axial vertical distance measurement value and the second axial vertical distance measurement value; The axial vertical distance is determined based on the preset value and the measurement difference.

3. The method according to claim 1, characterized in that, The step of determining the nozzle wall thickness of the tested needle valve body based on the length of the first projection line segment, the length of the second projection line segment, the axial vertical distance, and the preset angle includes: Determine the length difference between the length of the first projection line segment and the length of the second projection line segment; The nozzle wall thickness of the needle valve body under test is determined based on the preset trigonometric function relationship, the length difference, the axial vertical distance, and the preset angle.

4. The method according to claim 1, characterized in that, The first section and the second section cover the axial projection range of the nozzle.

5. The method according to claim 1, characterized in that, The axial vertical distance is less than the machining depth of the nozzle.

6. A device for measuring the nozzle wall thickness of a needle valve body, used to perform the method for measuring the nozzle wall thickness of a needle valve body as described in any one of claims 1 to 5, characterized in that, include: The fixture body (1), the upper pressure head (2), the positioning shaft (3) and the valve body of the needle to be tested (4) are installed on the fixture body (1), the positioning shaft (3) is installed on the fixture body (1), the outer circle of the valve body of the needle to be tested (4) is inserted into the fixture body (1), and the inner conical surface of the valve body of the needle to be tested (4) is in contact with the conical surface of the positioning shaft (3).

7. The apparatus according to claim 6, characterized in that, The intersection line between the first preset angle cone surface of the upper pressure head (2) and the inner hole of the upper pressure head (2) is used to simulate the first projection line segment, and the length of the first projection line segment is used to represent the cross-sectional diameter of the outer cone surface of the needle valve body (4) being tested.

8. The apparatus according to claim 6, characterized in that, The intersection line between the second preset angle cone surface of the positioning shaft (3) and the outer circle of the test needle valve body (4) is used to simulate the second projection line segment, and the length of the second projection line segment is used to represent the cross-sectional diameter of the inner cone surface of the test needle valve body (4).

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein the computer program is configured to execute, when run on a computer or processor, the method for measuring the nozzle wall thickness of the needle valve body as described in any one of claims 1 to 5.

10. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to run the computer program to perform the nozzle wall thickness measurement method for the needle valve body as described in any one of claims 1 to 5.

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