A process for detecting deviations in the assembly of railway passenger car piping systems.

Abstract

This invention discloses a process for detecting deviations in the assembly of union fittings in railway passenger car piping systems. The process includes the following steps: S1, selecting pipes of predetermined length (pipeline one and pipe line two), and connecting the shoulder sleeve and union fitting sleeve to pipes one and two respectively; S2, connecting the union fitting sleeve and shoulder sleeve to the pipe suspensions, ensuring they are in a natural hanging state; S3, placing the deviation detection fixture at the position of maximum deviation between the union fitting sleeve and shoulder sleeve, and detecting the axial and radial deviations; S4, if the axial and radial deviations are within acceptable limits, aligning the union fitting sleeve and shoulder sleeve with a wrench and tightening the union nut. This invention was developed by combining the requirements of existing vehicle measurement points and personnel usage, creating a union deviation detection fixture and establishing a detection method that can detect and control the radial and axial deviations of the union fitting sleeve and shoulder sleeve.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and more specifically, to a testing process for deviations in the assembly of pipe systems in railway passenger cars. Background Technology

[0002] In the air brake piping system connection structure of domestic large-scale railway passenger cars, threaded pipe fittings (TJ / CL529-2017) are mainly used. For ease of assembly and maintenance, a large number of unions (TB / T798), elbows (TB / T800), and tees (TB / T802) are installed in the piping system, collectively referred to as unions. Taking a 25T passenger car as an example, approximately 250 unions are installed in one car. The pipe connections are all rigid connections, which are prone to stress concentration due to the accumulation of assembly errors. According to various requirements, "the union sleeve shall not have obvious misalignment, oblique opening, or axial clearance." However, the assembly standards for the piping system of large-scale railway passenger cars do not quantify the stress resistance of unions, and it is inconvenient to carry out effective quality control in production. As the weakest point in the entire pipeline, the union is where assembly stress concentrates and is the main location for leakage failures.

[0003] Currently, air leakage at pipe joints has seriously affected the stable operation of passenger trains, posing potential risks of brake failure, failure of other ventilation equipment, and undervoltage of the load-bearing structure, forcing trains to operate at reduced speeds. Air leakage at pipe joints alone accounts for approximately 40% of the total failure rate of the braking system. Furthermore, various standards and technical documents clearly stipulate that the assembly of pipe joints must not be subject to stress, but there is a lack of targeted testing tools and methods. How to control this technical indicator is a common challenge faced by the entire railway system.

[0004] For example, Chinese patent CN112850403A discloses a novel automatic leveling and correction device operating system for an elevator car, including a level monitoring controller, a housing, and a base. It also includes an adjustment structure for automatic correction, a buffer structure for buffering and energy replenishment, and a cleaning structure for cleaning the equipment. The housing is located at the top of the base. The adjustment structure is installed around the top of the base, the buffer structure is installed in the middle of the top of the base, and the cleaning structure is installed in the middle of both ends of the top of the housing. When the elevator ascends from the bottom floor, the weight of the traveling cable increases with the floor height, causing a horizontal deviation in the housing. The level monitoring controller detects this deviation and promptly activates the pneumatic telescopic rod to work with the hinged seat to lift the deviated side until the housing is level, thus completing the automatic correction.

[0005] Chinese patent CN112835285A discloses a complete passive rubidium atomic clock design method and device, which includes a microcontroller, a satellite time synchronization module, a testing system, a frequency drift correction module, an operational reliability monitoring module, and component parameter big data modeling. This passive rubidium atomic clock design method and device compares the VCXO frequency division signal with the GPS second pulse signal to detect frequency deviation. In addition, the frequency output signal of the rubidium atomic frequency standard is isolated and amplified, one path is used for output, and the other path is sent to a frequency drift and stability tester to be compared with a high-stability clock signal to obtain the original frequency difference. Then, the microcontroller is used to control the frequency deviation correction.

[0006] However, the operating system of the novel automatic leveling and correction device for elevator cars disclosed in the aforementioned patents works by the weight of the traveling cable increasing with the floor height as the elevator ascends from the bottom floor, causing a horizontal deviation in the car body, which is detected by a level detection controller. In contrast, a complete passive rubidium atomic clock design method and device compares the VCXO frequency division signal with the GPS second pulse signal to detect frequency deviation. Neither of the aforementioned patents can be used for deviation detection by direct visual observation, thus failing to eliminate the unreliability of subjective human judgment. Furthermore, the aforementioned deviation detection devices are not compact or portable, and cannot be readily available.

[0007] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0008] In response to the problems in related technologies, this invention proposes a process for detecting deviations in the assembly of railway passenger car piping systems, in order to overcome the aforementioned technical problems existing in the existing related technologies.

[0009] Therefore, the specific technical solution adopted by the present invention is as follows:

[0010] A process for detecting deviations in the assembly unions of railway passenger car piping systems, the process comprising the following steps:

[0011] S1. Select pipe one and pipe two of preset length, and connect the shoulder sleeve and the union sleeve to pipe one and pipe two respectively.

[0012] S2. Connect the union sleeve and the shoulder sleeve to the pipe hanging respectively, and let the union sleeve and the shoulder sleeve hang naturally.

[0013] S3. Place the deviation detection fixture at the position of maximum deviation between the union sleeve and the shoulder sleeve, and detect the axial and radial deviations of the union sleeve and the shoulder sleeve.

[0014] S4. If the axial and radial deviations are qualified after inspection, use a wrench to align the union sleeve and the shoulder sleeve, and tighten the union nut.

[0015] Furthermore, the step of setting the deviation detection fixture at the position of maximum deviation between the union sleeve and the shoulder sleeve, and detecting the axial and radial deviations of the union sleeve and the shoulder sleeve, includes the following steps:

[0016] S31. Position the deviation detection fixture at the position of maximum deviation between the union sleeve and the shoulder sleeve.

[0017] S32. Position the axial deviation detection point within the first limit line;

[0018] S33. Position the radial deviation detection point within the second limit line.

[0019] Furthermore, the axial deviation represents the gap between the union sleeve and the shoulder sleeve on their axis.

[0020] Furthermore, the radial deviation represents the offset between the union sleeve and the shoulder sleeve in their diametrical direction.

[0021] Furthermore, in order to enable direct visual observation of the misalignment and gap of the union sleeve, define the degree of misalignment of the union sleeve, thereby eliminating the unreliability of subjective human judgment, ensuring that the joint stress-free process is truly implemented, and achieving controllable joint stress, a union deviation detection fixture was developed by combining the requirements of on-vehicle measurement points and personnel usage, and a detection method was formulated. This fixture can detect and control the radial and axial deviations of the union sleeve and the shoulder sleeve. The deviation detection fixture refers to the fixture used to detect the deviation between the union sleeve and the shoulder sleeve.

[0022] Furthermore, the deviation detection fixture is machined from 304 stainless steel plate, and the dimensions of the deviation detection fixture are 70×16×3mm.

[0023] Furthermore, both sides of the deviation detection fixture are laser-etched with boundary lines, with a line width of 0.1 mm and a depth of 0.2 mm.

[0024] Furthermore, the deviation detection fixture has a sloping lower part on both sides and a pointed bottom.

[0025] Furthermore, a silicone pad is provided between the live joint sleeve and the shoulder sleeve.

[0026] Furthermore, the pipe threads of both pipe one and pipe two conform to GB / T7306.2.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. This invention is designed based on the threaded pipe fitting connection structure of the brake pipe system of railway passenger cars. Based on years of car manufacturing experience and process testing, deviation standards were established. The invention was developed by combining the requirements of the measurement points on the actual vehicle and the needs of personnel. A tooling for detecting the deviation of the live joint was developed, and a detection method was formulated. It can detect and control the radial and axial deviations of the live joint sleeve and the shoulder sleeve.

[0029] 2. This invention adopts direct visual observation of the misalignment and gap of the union sleeve to define the degree of misalignment of the union sleeve, thereby eliminating the unreliability of subjective human judgment, making the joint stress-free process truly implemented, and realizing controllable joint stress.

[0030] 3. This invention is applicable to all types of railway passenger cars with a speed of 160km / h and below, and by designing and developing a tooling for detecting deviations in live joints and formulating a deviation detection method, it is possible to control the stiffness of live joint assembly. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a main flow chart of a railway passenger car piping system assembly union deviation detection process according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the installation of pipe one and the shoulder sleeve in a deviation detection process for the assembly of a railway passenger car piping system according to an embodiment of the present invention.

[0034] Figure 3 This is a schematic diagram of the installation of pipe two and the union sleeve in a railway passenger car piping system assembly union deviation detection process according to an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the installation of a deviation detection fixture for a railway passenger car piping system assembly joint deviation detection process according to an embodiment of the present invention.

[0036] Figure 5 This is a schematic diagram of a process for detecting deviations in the assembly of railway passenger car piping systems according to an embodiment of the present invention;

[0037] Figure 6 This is an installation schematic diagram of a railway passenger car piping system assembly joint deviation detection process according to an embodiment of the present invention;

[0038] Figure 7This is one of the measurement position diagrams of a railway passenger car piping system assembly joint deviation detection process according to an embodiment of the present invention;

[0039] Figure 8 This is the second schematic diagram of the measurement position for a deviation detection process of a railway passenger car piping system assembly joint according to an embodiment of the present invention.

[0040] In the picture:

[0041] 1. Pipeline 1; 2. Pipeline 2; 3. Shoulder sleeve; 4. Union sleeve; 5. Deviation detection fixture; 6. Wrench; 7. Union nut; 8. Silicone gasket; 9. Pipe thread; A. First limit line; a. Axial deviation detection point; B. Second limit line; b. Radial deviation detection point. Detailed Implementation

[0042] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0043] According to an embodiment of the present invention, a process for detecting deviations in the assembly of railway passenger car piping systems is provided.

[0044] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1 As shown, the railway passenger car piping system assembly union deviation detection process according to an embodiment of the present invention includes the following steps:

[0045] S1. Select pipe 1 and pipe 2 of preset length, and connect the threaded ends of the shoulder sleeve 3 and the union sleeve 4 to the pipe threads 9 of pipe 1 and pipe 2, respectively, as follows: Figures 2-3 As shown;

[0046] S2. Connect the swivel sleeve 4 and the shoulder sleeve 3 to the pipe suspension, and ensure that the swivel sleeve 4 and the shoulder sleeve 3 are in a natural hanging state, as follows: Figure 5 As shown;

[0047] S3. Position the deviation detection fixture 5 at the position of maximum deviation between the union sleeve 4 and the shoulder sleeve 3, and detect the axial and radial deviations of the union sleeve 4 and the shoulder sleeve 3, specifically as follows: Figure 4 As shown;

[0048] Among them, such as Figures 7-8As shown, the step of placing the deviation detection fixture 5 at the position of maximum deviation between the union sleeve 4 and the shoulder sleeve 3, and detecting the axial and radial deviations of the union sleeve 4 and the shoulder sleeve 3, includes the following steps:

[0049] S31. Position the deviation detection fixture 5 at the position of maximum deviation between the union sleeve 4 and the shoulder sleeve 3.

[0050] S32. Position the axial deviation detection point a (upper plane of the shoulder of the sleeve 3) within the first limit line A;

[0051] S33. Position the radial deviation detection point b (the chamfered edge of the threaded sealing surface of the union sleeve 4) within the second limit line B;

[0052] S4. If the axial and radial deviations are found to be within acceptable limits, use wrench 6 to align the union sleeve 4 and the shouldered sleeve 3, and tighten the union nut 7, as follows: Figure 6 As shown;

[0053] Specifically, when the deviation detection fixture 5 is against the maximum deviation position of the union sleeve 4, the axial deviation detection point a (the upper plane of the shoulder of the shoulder sleeve 3) is located within the first limit line A of the deviation detection fixture 5, and at the same time, the radial deviation detection point b (the edge of the sealing surface of the union sleeve 4) is located within the second limit line B of the deviation detection fixture 5. If the above conditions are met, it is judged to be qualified.

[0054] Specifically, by combining the needs of the current vehicle measurement points and the needs of personnel, a live joint deviation detection fixture 5 was developed and a detection method was formulated, which can detect and control the radial and axial deviations of the live joint sleeve 4 and the shoulder sleeve 3.

[0055] Wherein, the axial deviation represents the gap between the union sleeve 4 and the shoulder sleeve 3 on their axis, and the radial deviation represents the offset between the union sleeve 4 and the shoulder sleeve 3 in their diameter direction.

[0056] The deviation detection fixture 5 refers to the fixture for detecting the deviation between the live joint sleeve 4 and the shoulder sleeve 3.

[0057] The deviation detection fixture 5 is machined from 304 stainless steel plate, and its dimensions are 70×16×3mm, with a weight of approximately 23g.

[0058] The deviation detection fixture 5 has laser-engraved boundary lines and applicable fitting specifications on both sides, with a line width of 0.1 mm and a depth of 0.2 mm.

[0059] The deviation detection fixture 5 has a sloping lower part on both sides and a pointed bottom to align with the data acquisition point.

[0060] Specifically, the deviation detection fixture 5 is machined from 304 stainless steel plate, with dimensions of approximately 70×16×3mm and a weight of approximately 23g. Both sides of the deviation detection fixture 5 are laser-engraved with limit lines and applicable fitting specifications, with a line width of 0.1mm and a depth of 0.2mm. The lower part of the deviation detection fixture 5 is sloping, and the bottom is pointed to align with the data acquisition point. The deviation detection fixture 5 is not only compact and portable, but also easy to use at any time.

[0061] A silicone pad 8 is provided between the live fitting sleeve 4 and the shoulder sleeve 3.

[0062] The pipe threads of both pipe 1 and pipe 2 are GB / T7306.2.

[0063] Specifically, this invention adopts direct visual observation of the misalignment and gap of the union sleeve 4 to define the degree of misalignment of the union sleeve 4, eliminating the unreliability of subjective human judgment, so that the joint must not be subjected to stiffness process can be truly implemented and the joint "stiffness" can be controlled.

[0064] Specifically, by tracking air leakage faults in vehicles leaving the factory, 32 air leakage faults occurred in the piping system of 430 passenger cars leaving the factory in 2021, and 6 air leakage faults occurred in the piping system of 300 passenger cars leaving the factory in 2022. Comparative data analysis showed that the incidence of air leakage faults in the braking piping system of railway passenger cars was reduced by 73%, which significantly improved the operational stability of the braking system and is applicable to all types of railway passenger cars with speeds of 160 km / h and below. Furthermore, by designing and developing a live joint deviation detection fixture 5 and formulating a deviation detection method, the stress resistance of live joint assembly can be controlled.

[0065] In summary, by utilizing the above-mentioned technical solution of this invention, which is designed based on the threaded pipe fitting connection structure of the braking pipe system of railway passenger cars, and based on years of car manufacturing experience and process testing to formulate deviation standards, and manufactured in conjunction with the requirements of current vehicle measurement points and personnel usage, a union deviation detection fixture has been developed and a detection method has been formulated. This invention can detect and control the radial and axial deviations of the union fitting sleeve and the shoulder sleeve. This invention adopts direct visual observation of the misalignment and gap of the union fitting sleeve to define the degree of misalignment of the union fitting sleeve, thereby eliminating the unreliability of subjective human judgment, ensuring that the joint stress-free process is truly implemented, and achieving controllable joint stress. This invention is applicable to all types of railway passenger cars with speeds of 160 km / h and below, and by designing and developing a union deviation detection fixture and formulating a deviation detection method, the degree of stress in union assembly can be controlled.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A railway passenger car pipe line assembly articulation misalignment detection process characterized by, The detection process comprises the following steps: S1, selecting a pipe one and a pipe two of a preset length, and connecting the shoulder sleeve and the joint sleeve with the pipe one and the pipe two respectively; S2, connecting the pipe hanging of the joint sleeve and the shoulder sleeve respectively, and making the joint sleeve and the shoulder sleeve in a natural falling state; S3, standing the deviation detection tooling at the maximum deviation position of the joint sleeve and the shoulder sleeve, and detecting the axial deviation and the radial deviation of the joint sleeve and the shoulder sleeve; S4, if the axial deviation and the radial deviation are qualified, aligning the joint sleeve and the shoulder sleeve by using a wrench, and screwing the joint nut; The deviation detection tooling is stood at the maximum deviation position of the joint sleeve and the shoulder sleeve, and the axial deviation and the radial deviation of the joint sleeve and the shoulder sleeve are detected, which comprises the following steps: S31, standing the deviation detection tooling at the maximum deviation position of the joint sleeve and the shoulder sleeve; S32, locating the axial deviation detection point within the first limiting line; S33, locating the radial deviation detection point within the second limiting line.

2. A process for detecting misalignment of a pipe system assembly of a railway passenger car according to claim 1, characterized in that The axial deviation represents the gap of the joint sleeve and the shoulder sleeve on the axis thereof.

3. A process for detecting misalignment of a pipe system assembly of a railway passenger car as set forth in claim 1, wherein The radial deviation represents the offset amount of the joint sleeve and the shoulder sleeve in the diameter direction thereof.

4. A process for detecting misalignment of a pipe system assembly of a passenger car as set forth in claim 1, wherein The deviation detection tooling represents the tooling for detecting the deviation of the joint sleeve and the shoulder sleeve.

5. A process for detecting misalignment of a pipe line assembly articulation of a passenger rail car as set forth in claim 4, wherein, The deviation detection tooling is machined from 304 stainless steel plate, and the specification of the deviation detection tooling is 70×16×3mm.

6. A process for detecting misalignment of a pipe line assembly articulation of a passenger rail car as set forth in claim 5, wherein, Both sides of the deviation detection tooling are laser engraved with limiting lines, with a line width of 0.1mm and a depth of 0.2mm.

7. A process for detecting misalignment of a pipe line assembly of a passenger car of a railway as claimed in claim 6 wherein, The lower part of both sides of the deviation detection tooling is a slope, and the bottom is pointed.

8. A process for detecting misalignment of a pipe coupling assembly of a passenger rail car as set forth in claim 1, wherein, A silica gel pad is arranged between the joint sleeve and the shoulder sleeve.

9. A process for detecting misalignment of a pipe coupling assembly of a passenger rail car as set forth in claim 1, wherein, The pipe threads of the pipe one and the pipe two are both GB / T7306.2.

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