An inspection tool and inspection method for a fuel pipe assembly

Abstract

The present invention discloses an inspection tool and inspection method for a fuel pipe assembly. The inspection tool includes an inspection table and a plug gauge. The inspection table includes a fuel pipe orifice positioning block, an oil outlet pipe orifice positioning block, a return oil pipe orifice positioning block, and a mounting bracket positioning block. Through the mounting bracket positioning block, the fuel pipe assembly can be positioned and fixed, so that each orifice on it respectively fits with the end face inspection parts provided on one side of the fuel pipe orifice positioning block, the oil outlet pipe orifice positioning block, and the return oil pipe orifice positioning block. By observing whether there is a gap between the orifice and the end face inspection part, it can be detected whether there are deviations in the pipe length and the radial direction of the pipe diameter; the fuel pipe orifice positioning block, the oil outlet pipe orifice positioning block, and the return oil pipe orifice positioning block are also respectively provided with positioning holes, and the center axes of the respective positioning holes coincide with the corresponding orifice center axes. The plug gauge is used to pass through the positioning holes to detect the corresponding orifices, and by observing the insertion situation of the plug gauge, it can be detected whether there are deviations in the orifice diameter and the axial direction. The inspection tool of the present invention has a simple and fast inspection method, strong practicability, and high inspection accuracy.

Description

Technical Field

[0001] Embodiments of the present invention belong to the technical field of fuel pipe assembly inspection tools, and more specifically, relate to a fuel pipe assembly inspection tool and a detection method. Background Art

[0002] The fuel pipe assembly cannot be detected for the position of the fuel filling port and the dimensions of the installation points through conventional detection means. During the assembly process, when the fuel pipe assembly is assembled with the vehicle body and the fuel pipe, if there are deviations in the dimensions of the fuel pipe assembly, there will be interference with the vehicle body and the phenomenon that the fuel pipe cannot be connected.

[0003] Currently, during the inspection of the fuel pipe, it is mainly inspected and measured by various scales, and there is no special inspection tooling. When manually using conventional inspection tools such as calipers to detect each part of the fuel pipe assembly, the detection error is large, the detection efficiency is low, and in the face of the special-shaped structures of the various pipes of the fuel pipe assembly, it is impossible to calibrate and detect the positions of the various pipe orifices in three-dimensional space, and it is impossible to determine whether there are deviations in the axial and radial directions of the various pipes. Summary of the Invention

[0004] Aiming at the problems that the prior art cannot calibrate and detect the special-shaped structures of the orifices of the fuel pipe assembly, and the detection error is large and the detection efficiency is low, the present invention provides a fuel pipe assembly inspection tool to solve such problems.

[0005] To achieve the above object, the present invention provides a fuel pipe assembly inspection tool, including a plug gauge, a feeler gauge, and a detection table for installing and positioning the fuel pipe assembly; the detection table includes a bottom plate, and a fuel pipe orifice positioning block, an oil outlet pipe orifice positioning block, a return oil pipe orifice positioning block, and an installation frame positioning block provided on the top of the bottom plate, wherein: a positioning column is provided on the top of the installation frame positioning block, which is adapted to the limit fixing hole on the installation frame; end face detection parts are respectively provided on the sides of the fuel pipe orifice positioning block, the oil outlet pipe orifice positioning block, and the return oil pipe orifice positioning block and are attached to the respective orifices of the fuel pipe assembly; positioning holes are respectively provided on the fuel pipe orifice positioning block, the oil outlet pipe orifice positioning block, and the return oil pipe orifice positioning block, and the central axis of the positioning hole coincides with the central axis of the corresponding orifice on the fuel pipe assembly; the diameter of the holding rod of the plug gauge is the same as the diameter of the corresponding positioning hole, including a first plug gauge adapted to the diameter of the fuel pipe orifice, a second plug gauge adapted to the diameter of the oil outlet pipe orifice, and a third plug gauge adapted to the diameter of the return oil pipe orifice; the first plug gauge, the second plug gauge, and the third plug gauge are respectively axially limited through the corresponding positioning holes and then aligned with the corresponding orifices on the fuel pipe assembly; the positioning holes include: a first positioning hole provided on the fuel pipe orifice positioning block, the central axis of which coincides with the central axis of the fuel pipe orifice, and the diameter of which is larger than the inner diameter of the fuel pipe orifice and smaller than the outer diameter of the fuel pipe orifice; a second positioning hole provided on the oil outlet pipe orifice positioning block, the central axis of which coincides with the central axis of the oil outlet pipe orifice, and the diameter of which is larger than the inner diameter of the oil outlet pipe orifice and smaller than the outer diameter of the oil outlet pipe orifice; a third positioning hole provided on the return oil pipe orifice positioning block, the central axis of which coincides with the central axis of the return oil pipe orifice, and the diameter of which is larger than the inner diameter of the return oil pipe orifice and smaller than the outer diameter of the return oil pipe orifice; the end face detection parts include: a first end face detection part provided on the side of the fuel pipe orifice positioning block, the bottom of which is attached to the end face of the fuel pipe orifice; a second end face detection part provided on the side of the oil outlet pipe orifice positioning block, the bottom of which is attached to the end face of the oil outlet pipe orifice; a third end face detection part provided on the side of the return oil pipe orifice positioning block, the bottom of which is attached to the end face of the return oil pipe orifice; the feeler gauge detects the gap between the end face detection part and each orifice of the fuel pipe assembly.

[0006] Further, positioning detection parts respectively provided on the fuel pipe orifice positioning block, the oil outlet pipe orifice positioning block, and the return oil pipe orifice positioning block through threaded connection are also included. The positioning detection part is of a T-shaped round pipe structure, and the positioning hole and the end face detection part are provided thereon.

[0007] Further, an external thread is provided on the positioning column; the installation frame is sleeved on the positioning column and is tightened and fixed through a nut, so as to complete the installation and positioning work of the fuel pipe assembly on the detection table.

[0008] Further, it further includes a quick clamping mechanism provided on the bottom plate. The quick clamping mechanism includes a clamping base, a lever handle, a clamping rod, a linkage rod and a clamping head. The mounting bracket is sleeved on the positioning post. By pushing the lever handle, the clamping head clamps and fixes the mounting bracket, so as to complete the installation and positioning of the fuel pipe assembly on the test bench.

[0009] According to another aspect of the present invention, there is also provided a detection method for a fuel pipe assembly, including the following steps:

[0010] S100: Position and fix the fuel pipe assembly on the test bench. If the installation of the fuel pipe assembly is unsuccessful, it is determined that the inspection is unqualified; if the installation is successful, the next inspection work is carried out;

[0011] S200: Inspect the fit degree between the end faces of each pipe orifice and the corresponding end face detection part by visual inspection to determine whether there is a radial offset of the pipe orifice: if there is a clearance angle, it is determined that the pipe orifice has a radial offset and is unqualified; if the clearance detected by a feeler gauge exceeds the error range, it is determined that the pipe length does not meet the standard and is unqualified; if they are in fit or the clearance width detected by the feeler gauge is within the error range, it is determined that the inspection is qualified and the next inspection work is carried out;

[0012] S300: After limiting the corresponding specification plug gauge through the positioning hole, insert the through end at the front end thereof into the corresponding pipe orifice, and judge whether the diameter and position of the pipe orifice are normal according to the insertion situation: when it cannot be inserted, remove the fuel pipe assembly and perform secondary detection on the corresponding pipe orifice. If the through end cannot be inserted, it is determined that the diameter of the pipe orifice is too small. If it can be inserted, it is determined that there is an axial offset of the pipe orifice and the inspection is unqualified; if it can be inserted normally, it is determined that the inspection is qualified and the next inspection work is carried out;

[0013] S400: Insert the non-through end at the rear end of the plug gauge into the corresponding pipe orifice, and judge whether the diameter of the pipe orifice is too large according to the insertion situation: if the non-through end can be inserted into the pipe orifice, it is determined that the diameter of the pipe orifice is too large and the inspection is unqualified; if the non-through end cannot be inserted, it is determined that the inspection is qualified and the next inspection work is carried out;

[0014] S500: Complete the inspection work and remove the fuel pipe assembly.

[0015] Generally speaking, compared with the prior art through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

[0016] (1)An inspection tool for a fuel pipe assembly of the present invention can detect the special-shaped structures of each pipeline of the fuel pipe assembly: through the mounting frame positioning blocks provided on the inspection table, the fuel pipe assembly can be installed and positioned, and whether there are deviations in the positioning frame and the pipe lengths of each pipeline can be judged by the fitting conditions of the fuel pipe orifice positioning block, the oil outlet pipe orifice positioning block, and the return oil pipe orifice positioning block with their corresponding orifices respectively; by providing a first end face detection part, a second end face detection part, and a third end face detection part that are respectively in contact with the corresponding orifice end faces, and through visual inspection and measurement with a feeler gauge, the detection of the pipe length and the radial offset of the orifice can be realized; by providing a first positioning hole, a second positioning hole, and a third positioning hole, the central axes of the three coincide with the central axes of the corresponding orifices respectively, and the diameters of the three are the same as the diameters of the holding rods of the corresponding plug gauges. The through end and the non-through end of the plug gauge can be quickly aligned with the corresponding orifices through the corresponding positioning holes, so as to realize the detection of the orifice diameter and the axial deviation.

[0017] (2)An inspection tool for a fuel pipe assembly of the present invention can perform high-precision detection on the fuel pipe assembly through the cooperation of the inspection table, the plug gauge, and the feeler gauge, and its detection accuracy can reach the micron level; during the detection, the detection of each orifice of the fuel pipe assembly can be quickly completed through visual inspection and the use of the plug gauge and the feeler gauge. The detection method is simple, which can greatly reduce the labor hours consumed by the detection and improve the detection efficiency.

[0018] (3)An inspection tool for a fuel pipe assembly of the present invention has a simple structure, low cost, convenient assembly, strong practicability, and high popularization value. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of a fuel pipe assembly in an embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of the inspection table in the first embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of the positioning and detection part in the first embodiment of the present invention;

[0022] Figure 4 is a schematic structural diagram of the fuel pipe assembly loaded on the inspection table in the second embodiment of the present invention;

[0023] Figure 5 is a schematic structural diagram of the fuel pipe assembly loaded on the inspection table in the first embodiment of the present invention;

[0024] Figure 6 is a schematic structural diagram of the quick clamping mechanism in the second embodiment of the present invention;

[0025] Figure 7 is an exploded schematic diagram of the quick clamping mechanism in the second embodiment of the present invention;

[0026] Figure 8 Schematic structural diagram for detecting the fuel pipe assembly in the second embodiment of the present invention;

[0027] Figure 9 Schematic diagram of the detection process of a fuel pipe assembly in an embodiment of the present invention;

[0028] Figure 10 Schematic diagram of the process flow of a detection method for a fuel pipe assembly in an embodiment of the present invention.

[0029] In all the drawings, the same reference numerals represent the same technical features, specifically: 1 - fuel pipe assembly, 11 - fuel pipe opening, 12 - oil outlet pipe opening, 13 - oil return pipe opening, 14 - mounting bracket, 141 - limit fixing hole, 2 - detection table, 21 - bottom plate, 22 - fuel pipe opening positioning block, 23 - oil outlet pipe opening positioning block, 24 - oil return pipe opening positioning block, 25 - mounting bracket positioning block, 251 - positioning post, 26 - first positioning detection member, 261 - first positioning hole, 262 - first end face detection portion, 27 - second positioning detection member, 271 - second positioning hole, 272 - second end face detection portion, 28 - third positioning detection member, 281 - third positioning hole, 282 - third end face detection portion, 3 - quick clamping mechanism positioning block, 4 - quick clamping mechanism, 41 - clamping base, 42 - operating handle, 43 - clamping rod, 44 - linkage rod, 45 - clamping head, 5 - first plug gauge, 6 - second plug gauge, 7 - third plug gauge. Detailed implementation manners

[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] As Figure 1-8As shown in the figure, an inspection fixture for a fuel pipe assembly provided by an embodiment of the present invention includes an inspection table 2 and a plug gauge. The inspection table 2 includes a fuel pipe orifice positioning block 22, an oil outlet pipe orifice positioning block 23, a return oil pipe orifice positioning block 24, and a mounting bracket positioning block 25 provided on the top. The fuel pipe assembly 1 can be positioned and fixed through the mounting bracket positioning block 25, so that each orifice on it is respectively attached to the end face detection parts provided on one side of the fuel pipe orifice positioning block 22, the oil outlet pipe orifice positioning block 23, and the return oil pipe orifice positioning block 24. By observing whether there is a gap when the orifice is attached to the end face detection part, it can be detected whether there are deviations in the pipe length and the radial direction of the pipe diameter; positioning holes are respectively provided on the fuel pipe orifice positioning block 22, the oil outlet pipe orifice positioning block 23, and the return oil pipe orifice positioning block 24, and the center axes of the respective positioning holes coincide with the corresponding orifice center axes. A plug gauge of a suitable specification is used to pass through the positioning holes to detect the corresponding orifices. By observing the insertion situation of the plug gauge, it can be detected whether there are deviations in the orifice diameter and the axial direction. The inspection fixture of the present invention has a simple and fast detection method, strong practicability, and high detection accuracy.

[0032] The inspection fixture of the present invention can be used to detect a fuel pipe assembly 1 including, but not limited to, such as Figure 1 As shown in the figure, the fuel pipe assembly 1 includes a fuel pipe orifice 11, an oil outlet pipe orifice 12, a return oil pipe orifice 13, and a mounting bracket 14. A limit fixing hole 141 is also provided on the mounting bracket 14. By cooperating with the limit fixing hole 141 through a bolt, the fuel pipe assembly 1 can be fixed to the vehicle body, so that the fuel pipe orifice 11, the oil outlet pipe orifice 12, and the return oil pipe orifice 13 are aligned with the corresponding oil pipeline on the vehicle body for the next installation work. Therefore, by utilizing the positioning function of the mounting bracket 14, after the fuel pipe assembly 1 is fixed, the inspection fixture can be used to detect the deviations of the pipeline length, the orifice position (i.e., the orifice axial direction), the orifice end face (the orifice radial direction), and the orifice diameter of the fuel pipe assembly 1.

[0033] As Figures 2-4 As shown in the figure, in the first embodiment of the present invention, the inspection table 2 includes a bottom plate 21, and a fuel pipe orifice positioning block 22, an oil outlet pipe orifice positioning block 23, a return oil pipe orifice positioning block 24, a mounting bracket positioning block 25, and a positioning detection member fixedly provided on the top of the bottom plate 21. The positioning detection member is of a T-shaped circular tube structure and includes a first positioning detection member 26, a second positioning detection member 27, and a third positioning detection member 28 fixedly provided on the fuel pipe orifice positioning block 22, the oil outlet pipe orifice positioning block 23, and the return oil pipe orifice positioning block 24 respectively through threaded connections.

[0034] The first positioning and detecting member 26 includes a first positioning hole 261 and a first end face detecting portion 262. The bottom of the first end face detecting portion 262 is a smooth plane, which can be kept in contact with the end face of the fuel filling pipe orifice 11. The central axis of the first positioning hole 261 coincides with the central axis of the fuel filling pipe orifice 11. Its diameter is larger than the inner diameter of the fuel filling pipe orifice 11 and smaller than the outer diameter of the fuel filling pipe orifice 11. Since the outer diameter of the fuel filling pipe orifice 11 is larger than the diameter of the first positioning hole 261, the end face of the fuel filling pipe orifice 11 is in contact with the first end face detecting portion 262.

[0035] The second positioning and detecting member 27 includes a second positioning hole 271 and a second end face detecting portion 272. The bottom of the second end face detecting portion 272 is a smooth plane, which can be kept in contact with the end face of the oil outlet pipe orifice 12. The central axis of the second positioning hole 271 coincides with the central axis of the oil outlet pipe orifice 12. Its diameter is larger than the inner diameter of the oil outlet pipe orifice 12 and smaller than the outer diameter of the oil outlet pipe orifice 12.

[0036] The third positioning and detecting member 28 includes a third positioning hole 281 and a third end face detecting portion 282. The bottom of the third end face detecting portion 282 is a smooth plane, which can be kept in contact with the end face of the oil return pipe orifice 13. The central axis of the third positioning hole 281 coincides with the central axis of the oil return pipe orifice 13. Its diameter is larger than the inner diameter of the oil return pipe orifice 13 and smaller than the outer diameter of the oil return pipe orifice 13.

[0037] The top of the mounting bracket positioning block 25 is provided with a positioning post 251. The positioning post 251 is adapted to the limit fixing hole 141 on the mounting bracket 14, and the limit fixing hole 141 can be sleeved on the positioning post 251. The positioning post 251 is also provided with an external thread. By cooperating with a nut, the mounting bracket 14 can be fixed and limited to the top of the mounting bracket positioning block 25, so that the fuel pipe assembly 1 completes the installation and positioning work on the inspection fixture 2 and can carry out the next detection work.

[0038] Such as Figures 5-7As shown, in the second embodiment of the present invention, to improve the installation positioning and disassembly speed of the fuel pipe assembly 1, a quick clamping mechanism 4 is provided to quickly press and fix the mounting bracket 14. Compared with fixing by tightening nuts on the positioning posts 251, the operation steps are fewer, and only one action is required to complete the fixing or loosening action of the mounting bracket 14, saving the detection state duration. The quick clamping mechanism 4 is fixed on the bottom plate 211 through the quick clamping mechanism positioning block 3 provided at the bottom, and the quick clamping mechanism positioning block 3 is at the same height as the mounting bracket positioning block 25. The quick clamping mechanism 4 includes a pressing base 41, a pulling handle 42, a pressing rod 43, a linkage rod 44 and a pressing head 45. The top of the pressing base 41 is hinged to one end of the pressing rod 43, and the middle end thereof is hinged to the bottom of the pulling handle 42; the top of the linkage rod 44 is hinged to the middle end of the pulling handle 42, and the bottom thereof is hinged to the middle end of the pressing rod 43; a four-bar linkage mechanism is formed by sequentially connecting the pressing base 41, the pulling handle 42, the pressing rod 43 and the linkage rod 44; when the pulling handle 42 is pushed outwards, the pressing head 45 provided at the other end of the pressing rod 43 moves upwards and disengages from the mounting bracket 14 to complete the loosening action; when the pulling handle 42 is pushed inwards and kept in a vertical state, the hinge points of the pulling handle 42 with the pressing base 41, the linkage rod 44 and the pressing rod 43 of the linkage rod 44 are on the same straight line, playing a self-locking role, and the pressing head 45 firmly presses the mounting bracket 14.

[0039] After the mounting bracket 14 is sleeved on the positioning post 251 and pressed and fixed, and the fuel pipe assembly 1 is installed on the inspection table 2, the next inspection work can be carried out. By observing the fitting degree between each pipe orifice of the fuel pipe assembly 1 and the corresponding end face inspection part, it can be detected whether the pipe orifice has a radial offset or the length does not meet the standard; by using a plug gauge to cooperate with the corresponding positioning holes to inspect each pipe orifice, it can be detected whether there are deviations in the pipe orifice diameter and axial direction. As Figure 8 shown, in the present invention, the plug gauge is composed of a holding rod and a go end and a not-go end respectively provided at the front and rear ends of the holding rod, and it includes a first plug gauge 51 adapted to the diameter of the fuel pipe orifice 11, a second plug gauge 52 adapted to the diameter of the outlet pipe orifice 12, and a third plug gauge 53 adapted to the diameter of the return pipe orifice 13.

[0040] The diameter of the holding rod of the first plug gauge 51 is the same as the diameter of the first positioning hole 261. When passing through the first positioning hole 261, the central axis of the first plug gauge 51 coincides with the central axis of the fuel filling pipe orifice 11. The first positioning hole 261 can axially limit the holding rod of the first plug gauge 51, which facilitates the alignment of the go end and no-go end of the first plug gauge 51 and their insertion into the fuel filling pipe orifice 11. When the go end of the first plug gauge 51 can be normally inserted into the fuel filling pipe orifice 11 and the no-go end cannot be inserted, it can be determined that the diameter of the fuel filling pipe orifice 11 meets the standard and there is no axial deviation; when both the go end and no-go end of the first plug gauge 51 can be inserted into the fuel filling pipe orifice 11, it can be determined that the diameter of the fuel filling pipe orifice 11 is too large; when the go end of the first plug gauge 51 cannot be inserted into the fuel filling pipe orifice 11, it is possible that the diameter of the fuel filling pipe orifice 11 is too small or there is an axial deviation. When the fuel pipe assembly 1 is disassembled for re-inspection, if the go end can be normally inserted, it can be determined that there is an axial deviation in the fuel filling pipe orifice 11 and its orifice position is deviated; if it cannot be inserted, it can be determined that the diameter of the fuel filling pipe orifice 11 is too small.

[0041] The diameter of the holding rod of the second plug gauge 52 is the same as the diameter of the second positioning hole 271, and its go end and no-go end are adapted to the diameter of the oil outlet pipe orifice 12, which can cooperate with the second positioning hole 271 to detect whether there are deviations in the diameter and axis of the oil outlet pipe orifice 12.

[0042] The diameter of the holding rod of the third plug gauge 53 is the same as the diameter of the third positioning hole 281, and its go end and no-go end are adapted to the diameter of the oil return pipe orifice 13, which can cooperate with the third positioning hole 281 to detect whether there are deviations in the diameter and axis of the oil return pipe orifice 13.

[0043] As Figures 9-10 shown, through the fuel pipe assembly inspection tool, an embodiment of the present invention further provides a detection method for a fuel pipe assembly, including the following steps:

[0044] S100: Position and fix the fuel pipe assembly 1 on the inspection table 2. If the fuel pipe assembly 1 cannot be successfully installed, it is determined that the inspection is unqualified; if the installation is successful, proceed to the next inspection work;

[0045] S200: Inspect the fit degree between the end faces of each pipe orifice and the corresponding end face inspection part by visual inspection to determine whether there is a radial deviation of the pipe orifice: if there is a clearance angle, it is determined that there is a radial deviation of the pipe orifice diameter and it is unqualified; if the clearance detected by a feeler gauge exceeds the error range, it is determined that the pipe length does not meet the standard and it is unqualified; if they are in contact or the clearance width detected by a feeler gauge is within the error range, it is determined that the inspection is qualified and proceed to the next inspection work;

[0046] S300: After limiting the plug gauge of the corresponding specification through the positioning holes, insert the go end at the front end thereof into the corresponding pipe orifice, and judge whether the diameter and position of the pipe orifice are normal according to the insertion situation: when it cannot be inserted, remove the fuel pipe assembly 1 and perform secondary detection on the corresponding pipe orifice. If the go end cannot be inserted, it is determined that the diameter of the pipe orifice is too small; if it can be inserted, it is determined that the axial deviation of the pipe orifice occurs, and the inspection is unqualified. If it can be inserted normally, it is determined that the inspection is qualified, and the next detection work is carried out;

[0047] S400: Insert the not-go end at the rear end of the plug gauge into the corresponding pipe orifice, and judge whether the diameter of the pipe orifice is too large according to the insertion situation: if the not-go end can be inserted into the pipe orifice, it is determined that the diameter of the pipe orifice is too large, and the inspection is unqualified; if the not-go end cannot be inserted, it is determined that the inspection is qualified, and the next detection work is carried out;

[0048] S500: Complete the inspection work and remove the fuel pipe assembly 1.

[0049] In step S100, it can be judged according to visual inspection whether the limit fixing holes on the mounting bracket 14 do not match the positioning posts 251 or the pipeline is too long to be installed. After marking the reasons for the unqualified detection, the detection of the next group of fuel pipe assemblies 1 is carried out.

[0050] In the embodiment of the present invention, through the mounting bracket positioning block 25 provided on the detection table 2, the installation and positioning of the fuel pipe assembly 1 can be realized, and whether there are deviations in the positioning bracket 14 and the pipe lengths of each pipeline can be judged by the fitting conditions of the fuel pipe orifice positioning block 22, the oil outlet pipe orifice positioning block 23 and the oil return pipe orifice positioning block 24 with each pipe orifice respectively; by providing the first end face detection part 262, the second end face detection part 272 and the third end face detection part 282 to be respectively in contact with the corresponding pipe orifice end faces, and through visual inspection and using a feeler gauge to measure, the detection of whether there is a radial deviation of the pipe orifice can be realized; by providing the first positioning hole 261, the second positioning hole 271 and the third positioning hole 281, the central axes of the three coincide with the central axes of the corresponding pipe orifices respectively, and the diameters of the three are the same as the diameters of the holding rods of the corresponding plug gauges, and the go end and the not-go end of the plug gauge can be quickly aligned with the corresponding pipe orifices through the corresponding positioning holes, so as to realize the detection of the diameter and axial deviation of the pipe orifice.

[0051] The detection table 2 of the present invention, in cooperation with the plug gauge and the feeler gauge, can perform high-precision detection on the fuel pipe assembly 1, and its detection accuracy can reach the micron level; during detection, the detection of each pipe orifice of the fuel pipe assembly 1 can be quickly completed through visual inspection and using the plug gauge and the feeler gauge. The detection method is simple, which can greatly reduce the labor hours consumed by detection and improve the detection efficiency.

[0052] The fuel pipe assembly inspection tool of the present invention has a simple structure, low cost, convenient assembly, strong practicability and high popularization value.

[0053] For the inspection table 2 of the present invention, when inspecting fuel pipe assemblies 1 of different types, the positions, heights and inclination angles of various functional components can be adjusted according to the special-shaped structures of the fuel pipe assemblies, so that the limit fixing holes 141 of the mounting frame 14 are adapted to the positioning columns 251, each end face inspection part is attached to the corresponding pipe orifice, and the central axes of the positioning holes coincide with the central axes of the corresponding pipe orifices, thereby realizing the inspection of fuel pipe assemblies 1 of different types. Each functional component on the inspection table 2 can be redesigned after being measured according to the standard parts of the fuel pipe assembly 1, and obtained through machining and then fixed on the bottom plate 21.

[0054] Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An inspection tool for a fuel pipe assembly, comprising a plug gauge, a feeler gauge, and a detection table (2) for installing and positioning the fuel pipe assembly, characterized in that: The detection table (2) includes a bottom plate (21), and a fuel pipe mouth positioning block (22), an oil outlet pipe mouth positioning block (23), a return oil pipe mouth positioning block (24), and a mounting frame positioning block (25) provided on the top of the bottom plate (21), wherein: A positioning post (251) is provided on the top of the mounting frame positioning block (25), which is adapted to the limit fixing hole (141) on the mounting frame (14); End face detection parts are respectively provided on the sides of the fuel pipe mouth positioning block (22), the oil outlet pipe mouth positioning block (23), and the return oil pipe mouth positioning block (24) and are in contact with the respective pipe mouths on the fuel pipe assembly (1); Positioning holes are respectively provided on the fuel pipe mouth positioning block (22), the oil outlet pipe mouth positioning block (23), and the return oil pipe mouth positioning block (24), and the central axis of the positioning hole coincides with the central axis of the corresponding pipe mouth on the fuel pipe assembly (1); The diameter of the holding rod of the plug gauge is the same as the diameter of the corresponding positioning hole, and includes a first plug gauge (51) adapted to the diameter of the fuel pipe mouth (11), a second plug gauge (52) adapted to the diameter of the oil outlet pipe mouth (12), and a third plug gauge (53) adapted to the diameter of the return oil pipe mouth (13); The first plug gauge (51), the second plug gauge (52), and the third plug gauge (53) are respectively axially limited through the corresponding positioning holes and then aligned with the corresponding pipe mouths on the fuel pipe assembly (1); The positioning holes include: a first positioning hole (261) provided on the fuel pipe mouth positioning block (22), the central axis of which coincides with the central axis of the fuel pipe mouth (11), and the diameter is larger than the inner diameter of the fuel pipe mouth (11) and smaller than the outer diameter of the fuel pipe mouth (11); a second positioning hole (271) provided on the oil outlet pipe mouth positioning block (23), the central axis of which coincides with the central axis of the oil outlet pipe mouth (12), and the diameter is larger than the inner diameter of the oil outlet pipe mouth (12) and smaller than the outer diameter of the oil outlet pipe mouth (12); a third positioning hole (281) provided on the return oil pipe mouth positioning block (24), the central axis of which coincides with the central axis of the return oil pipe mouth (13), and the diameter is larger than the inner diameter of the return oil pipe mouth (13) and smaller than the outer diameter of the return oil pipe mouth (13); The end face detection parts include: a first end face detection part (262) provided on the side of the fuel pipe mouth positioning block (22), the bottom of which is in contact with the end face of the fuel pipe mouth (11); a second end face detection part (272) provided on the side of the oil outlet pipe mouth positioning block (23), the bottom of which is in contact with the end face of the oil outlet pipe mouth (12); a third end face detection part (282) provided on the side of the return oil pipe mouth positioning block (24), the bottom of which is in contact with the end face of the return oil pipe mouth (13); The feeler gauge is used to detect the gap between the end face detection part and each pipe mouth on the fuel pipe assembly (1).

2. The fuel pipe assembly inspection fixture according to claim 1, characterized in that, It further includes positioning detection parts respectively provided on the fuel pipe mouth positioning block (22), the oil outlet pipe mouth positioning block (23), and the return oil pipe mouth positioning block (24) through threaded connection. The positioning detection part is of a T-shaped round tube structure, and the positioning hole and the end face detection part are provided thereon.

3. The inspection fixture for a fuel pipe assembly according to claim 1, characterized in that, The positioning post (251) is provided with an external thread; the mounting bracket (14) is sleeved on the positioning post (251) and tightened and fixed by a nut, so that the fuel pipe assembly (1) completes the installation and positioning work on the test bench (2).

4. The inspection fixture for a fuel pipe assembly according to claim 1, characterized in that, It further includes a quick pressing mechanism (4) arranged on the bottom plate. The quick pressing mechanism (4) includes a pressing base (41), a lever handle (42), a pressing rod (43), a linkage rod (44) and a pressing head (45). The mounting bracket (14) is sleeved on the positioning post (251). By pushing the lever handle (42), the pressing head (45) presses and fixes the mounting bracket (14), so that the fuel pipe assembly (1) completes the installation and positioning work on the test bench (2).

5. A detection method for a fuel filling pipe assembly, which is implemented by using the fuel filling pipe assembly inspection fixture described in any one of claims 1-4, characterized in that, It includes the following steps: S100: Position and fix the fuel pipe assembly (1) on the test bench (2). If the installation of the fuel pipe assembly (1) is not successful, it is determined that the inspection is unqualified; if the installation is successful, proceed to the next inspection work. S200: Inspect the fit degree between the end faces of each pipe orifice and the corresponding end face inspection part by visual inspection to determine whether there is a radial offset of the pipe orifice: if there is a clearance angle, it is determined that the pipe orifice has a radial offset and is unqualified; if the clearance detected by a feeler gauge exceeds the error range, it is determined that the pipe length does not meet the standard and is unqualified; if they fit or the clearance width detected by a feeler gauge is within the error range, it is determined that the inspection is qualified and proceed to the next inspection work. S300: After limiting the corresponding specification plug gauge through the positioning hole, insert the go end at the front end thereof into the corresponding pipe orifice, and judge whether the diameter and position of the pipe orifice are normal according to the insertion situation: when it cannot be inserted, remove the fuel pipe assembly (1) and conduct a secondary inspection on the corresponding pipe orifice. If the go end cannot be inserted, it is determined that the diameter of the pipe orifice is too small; if it can be inserted, it is determined that there is an axial offset of the pipe orifice and the inspection is unqualified. If it can be inserted normally, it is determined that the inspection is qualified and proceed to the next inspection work. S400: Insert the not-go end at the rear end of the plug gauge into the corresponding pipe orifice, and judge whether the diameter of the pipe orifice is too large according to the insertion situation: if the not-go end can be inserted into the pipe orifice, it is determined that the diameter of the pipe orifice is too large and the inspection is unqualified; if the not-go end cannot be inserted, it is determined that the inspection is qualified and proceed to the next inspection work. S500: Complete the inspection work and remove the fuel pipe assembly (1).

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