High-precision bidirectional detection gauge

Abstract

The utility model belongs to rail transit detection tool technical field, specifically disclose a kind of high-precision bidirectional detection measuring tool, including base body and the boss detection unit for detecting lock mouth size and the recess detection unit for detecting lock tongue size integrated on the base body;The recess detection unit includes the big recess for detecting lock tongue length and the small recess for detecting lock tongue width;The boss detection unit includes the big boss for detecting lock mouth length and the small boss for detecting lock mouth width.The utility model can improve detection accuracy and work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of rail transit inspection tools, specifically to a high-precision bidirectional inspection measuring tool. Background Technology

[0002] In railway passenger car door interlocking systems, the precision of the fit between the latch and the latch opening of the flap lock directly determines the reliability of the door locking, and is a key technical aspect ensuring train operation safety and passenger comfort. Currently, the industry has established clear design dimension standards for the core mating components of railway passenger car flap locks—the latch opening and the latch itself: the latch opening is designed to be 26.8mm ± 0.1mm in length and 11.2mm ± 0.1mm in width, while the latch opening is designed to be 26.5mm ± 0.2mm in length and 11mm ± 0.2mm in width. The fit clearance between the two must be strictly controlled within a specific range to avoid problems such as locking failure or difficulty in opening.

[0003] However, existing testing technologies still rely on general-purpose vernier calipers for component measurements. This method exposes three major technical defects in practical applications, severely restricting testing accuracy and production efficiency, and making it difficult to meet the high reliability requirements of railway passenger cars for interlocking systems:

[0004] Firstly, inconsistent standards lead to excessive cumulative errors. Because the dimensions of the latch and bolt need to be measured separately for length and width, the measurement standards and operating angles need to be switched frequently during the process. In addition, the slight shaking when the measuring tool is held manually results in a cumulative error of up to ±0.15mm for a single measurement, which is close to the upper limit of the tolerance of the latch design size (±0.1mm). This makes it impossible to accurately reflect the actual fit between the latch and bolt, creating potential quality problems for subsequent assembly.

[0005] Secondly, manual reading and judgment are inefficient. When using vernier calipers for inspection, operators must measure, read, and record the four parameters—locking tongue length, locking tongue width, locking tongue length, and locking tongue width—one by one, with each inspection process taking 3-5 minutes. In the context of mass production of railway passenger cars, this inspection efficiency is far from meeting the production line's pace requirements, making the inspection process a bottleneck in the production process. This not only increases manufacturing costs but may also lead to product delivery delays due to inspection backlogs.

[0006] Third, the fit cannot be directly determined. Existing testing methods can only obtain the individual dimensions of the latch and latch opening. Operators must manually calculate (e.g., latch opening length - latch length, latch opening width - latch width) to indirectly determine the gap or interference between the two. This process not only carries the risk of calculation errors but also cannot visually reflect the actual fit after the latch is inserted into the latch opening. Especially in low-temperature winter environments, the fit gap can change due to thermal expansion and contraction of metal components. If the fit cannot be accurately controlled in the early stages of testing, latch and latch opening may fail to fit (e.g., jamming or loosening), directly affecting the reliability of the door locking and posing a threat to train operation safety.

[0007] In summary, current railway passenger car flap lock testing technology based on vernier calipers can no longer meet the production testing requirements of high precision, high efficiency, and high reliability. Utility Model Content

[0008] This invention provides a high-precision bidirectional measuring tool, which aims to improve the accuracy of testing and work efficiency.

[0009] This utility model is achieved through the following technical solution: a high-precision bidirectional measuring tool, including a base and a boss detection unit for detecting the size of the lock opening and a groove detection unit for detecting the size of the lock tongue, integrated on the base;

[0010] The groove detection unit includes a large groove for detecting the length of the latch and a small groove for detecting the width of the latch.

[0011] The boss detection unit includes a large boss for detecting the length of the lock opening and a small boss for detecting the width of the lock opening.

[0012] Compared with existing technologies, this solution has the following advantages and beneficial effects:

[0013] This solution includes a high-precision bidirectional testing tool and rapid judgment method for railway passenger car flap locks. The large and small protrusions of the testing tool are placed at the lock opening of the flap lock panel to measure the length and width of the opening. Similarly, the large and small grooves of the testing tool are placed at the latch of the flap lock to measure its length and width. This improves the accuracy and efficiency of flap lock panel and latch testing, ensuring that the fit clearances after assembly meet standard requirements and guaranteeing the safe operation of the flap lock after installation.

[0014] By integrating a boss detection unit (lock opening detection) and a groove detection unit (lock tongue detection) on the same substrate, the dimensions of key mating parts of the lock (lock opening and lock tongue) can be inspected without changing multiple sets of inspection tools. This avoids the cumbersome process of traditional separate tool and step-by-step inspection, reduces inspection operation time, and is especially suitable for efficient quality inspection in mass production scenarios.

[0015] The boss detection unit is specifically designed with large bosses (lock length detection) and small bosses (lock width detection), while the groove detection unit is designed with large grooves (lock tongue length detection) and small grooves (lock tongue width detection). Each detection structure corresponds one-to-one with the size detection requirements of the lock and lock tongue, avoiding size adaptation deviations when using general measuring tools, reducing the risk of misjudgment caused by mismatch between the detection tools and the detection objects, and ensuring the reliability of the lock and lock tongue size determination results.

[0016] The functions of the detection unit and the object being detected are clearly linked (a boss corresponds only to the lock lug, a groove corresponds only to the lock tongue, and length / width detection is distinguished by the structure of large and small bosses and large and small grooves). Operators can quickly identify the purpose of the detection through structural type and size markings, without the need for complex parameter adjustments or tool calibration. Even novices can quickly master the detection method, reducing personnel training costs. All detection functions are integrated into a single base, which is smaller and lighter than multiple sets of scattered detection tools, making it easy to carry to the field (such as railway passenger car assembly workshops and after-sales maintenance points). At the same time, the integrated structure reduces the probability of tool loss or damage, extends the service life of measuring instruments, and reduces the procurement and maintenance costs of enterprise detection tools.

[0017] Furthermore, by accurately detecting the critical dimensions of the lock opening and bolt, components with out-of-tolerance dimensions can be screened out in advance, avoiding functional failures caused by excessively large (loose lock) or excessively small (jammed lock) clearances between the lock opening and bolt. This is particularly suitable for scenarios with extremely high security requirements, such as flip-top locks in railway passenger cars, indirectly ensuring the operational safety of terminal equipment (such as railway passenger cars). The gauge's unified testing logic (fixed testing units corresponding to fixed dimensional parameters) ensures consistent testing standards for different operators and different testing batches, avoiding fluctuations in test results due to differences in human operation. This provides a unified quality inspection basis for mass production of locks, helping enterprises achieve standardized manufacturing and improve product quality stability.

[0018] Furthermore, both sides of the large boss and the small boss are symmetrically provided with steps to form a boss structure with an upper limit size and a lower limit size; the size range between the upper limit size and the lower limit size of the large boss and the small boss respectively corresponds to the qualified size range of the lock length and width.

[0019] The inner walls of the large groove and the small groove are symmetrically provided with steps to form a groove structure with an upper limit size and a lower limit size. The size range between the upper limit size and the lower limit size of the large groove and the small groove respectively corresponds to the qualified size range of the bolt length and width.

[0020] Beneficial effects: The large and small bosses form a structure with upper and lower limits for dimensions through symmetrical steps on both sides, and their size range directly corresponds to the acceptable range of lock length / width. Similarly, the large and small grooves form an upper and lower limit size structure through symmetrical steps on the inner sidewalls, matching the acceptable range of lock tongue length / width. Compared with a single-dimensional detection structure without steps, this method can simultaneously verify both the maximum and minimum allowable values ​​of the object being tested, avoiding omissions of out-of-tolerance results caused by measuring only a single value. This improves the accuracy of dimensional judgment to the boundary level of the acceptable range, ensuring that the test results fully meet the lock design requirements.

[0021] For the tolerance design of the lock mouth and lock tongue, the upper and lower limit size range formed by the step can be accurately matched with the tolerance range. It can be adapted to the inspection of locks with specific tolerance requirements without adjusting the measuring tool structure, avoiding the problem of frequent calibration or replacement of general measuring tools, and improving the specific adaptability of the measuring tool to the target lock.

[0022] Furthermore, the large protrusion and the small protrusion are located on opposite sides of the substrate, and the large groove and the small groove are located on the other opposite sides of the substrate.

[0023] Beneficial effects: The large and small protrusions are located on opposite sides of the base, and the large and small grooves are located on the other opposite sides of the base, which completely separates the operating areas of lock detection (protrusions) and lock tongue detection (grooves). When using the protrusions to detect locks, operators do not need to avoid the groove structure, and vice versa. This effectively avoids mutual interference between different detection units during operation, reduces the probability of operational errors, and is especially suitable for scenarios where one hand is used or the detection objects are switched quickly, thus improving the overall smoothness of the detection operation.

[0024] Furthermore, the central axes of the large boss and the small boss are collinear, and the central axes of the large groove and the small groove are collinear.

[0025] Beneficial effects: The collinearity of the central axes of the large and small bosses ensures that the length and width of the lock opening are measured based on the same axial reference; the collinearity of the central axes of the large and small grooves ensures that the length and width of the latch follow a unified axial standard. Compared to the misaligned axis design, this avoids axial errors in length / width measurement caused by reference offset. Especially for the high-precision tolerance requirements of the lock opening (e.g., length 26.8mm ± 0.1mm, width 11.2mm ± 0.1mm) and the latch (e.g., length 26.5mm ± 0.2mm, width 11mm ± 0.2mm), it further reduces measurement deviations and ensures consistency between dimensional judgments and actual assembly requirements.

[0026] Furthermore, the substrate has a square structure and the flatness of the substrate is ≤0.01mm.

[0027] Beneficial effects: The base has a square structure with a flatness of ≤0.01mm. On the one hand, the square structure provides a regular installation reference for the boss (lock opening detection) and the groove (lock tongue detection), ensuring that each detection unit is accurately distributed along the square side and avoiding positioning deviation of the detection unit caused by the irregular shape of the base. On the other hand, the ultra-high flatness (≤0.01mm) eliminates the reference fluctuation caused by the unevenness of the base surface, so that the contact surface between the measuring instrument and the lock remains flat during the test, avoiding virtual contact error caused by the warping of the base. It is especially suitable for the high precision tolerance requirements of the lock opening and lock tongue, further reducing the detection deviation.

[0028] Furthermore, the portions corresponding to the upper limit dimensions of the large protrusion and the small protrusion are located close to the base, while the portions corresponding to the upper limit dimensions of the large groove and the small groove are located close to the outer side of the base.

[0029] Beneficial effects: The upper limit size of the boss is close to the base, so the lock mouth needs to fit the base surface during testing to match the upper limit size. If the lock mouth size exceeds the upper limit, it will not be fully inserted due to the obstruction of the base, making the judgment result more intuitive. The upper limit size of the groove is close to the outside. If the size of the lock tongue exceeds the upper limit, it will show jamming on the outside of the groove. It can quickly identify the deviation without going deep into the groove, avoiding the cumbersome process of "requiring full insertion / removal for judgment" caused by improper structural design, and reducing misjudgments caused by improper operation.

[0030] Furthermore, the corners of the substrate are provided with a rounded corner structure.

[0031] Beneficial effects: The rounded corners of the base eliminate the sharp edges of the right-angle corners of the square base, which can effectively avoid the risk of operators' hands being scratched by the right angles when holding, picking up and putting down measuring tools or coming close to the lock for testing. It is especially suitable for scenarios with frequent hand-held operations during batch testing, reducing safety hazards and improving safety in use.

[0032] Furthermore, the substrate is a stainless steel substrate.

[0033] Beneficial effects: Stainless steel substrates can effectively resist the corrosion of moisture, oil, and minor chemicals, avoiding surface unevenness or dimensional deviations caused by rust and oxidation. Compared with easily corroded materials such as carbon steel, it does not require frequent rust removal and maintenance, and can maintain structural integrity and testing accuracy in complex environments, adapting to the diverse on-site testing needs of the railway industry. In addition, stainless steel has high strength and high hardness mechanical properties, which can better resist the impact and friction generated by the protrusion inserting into the lock and the lock tongue embedding into the groove during the testing process compared with ordinary metal or plastic substrates, reducing the deformation or wear of the substrate.

[0034] Furthermore, the large and small protrusions of the protrusion detection unit are integrally formed with the substrate, and the large and small grooves of the groove detection unit are machined on the substrate by milling.

[0035] Beneficial effects: The large and small bosses are integrally molded with the base, eliminating the splicing gaps or connection interfaces between the bosses and the base. Compared with separate welding and assembly structures, this can significantly improve the impact and bending resistance of the bosses. During testing, the force borne by the boss when it is inserted into the locking slot can be directly transmitted to the base, avoiding boss displacement or breakage due to loose connection, ensuring long-term stability of boss dimensions, and reducing testing errors caused by structural failure.

[0036] Furthermore, the thickness of the substrate is 2-3 mm.

[0037] Beneficial effects: The integral forming process of the substrate (such as forging and stamping) can precisely control the dimensional accuracy of the boss at a thickness of 2mm-3mm (avoiding uneven forming caused by excessive thickness); when milling the groove, there is no need to worry about the problems of "too thin and easy to break" or "too thick and difficult to cut" within this thickness range, and the verticality and dimensional tolerance of the inner wall step of the groove can be ensured by CNC milling. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0039] Figure 1 This is a front view of an embodiment of a high-precision bidirectional measuring tool according to the present invention;

[0040] Figure 2 This is a side view of an embodiment of a high-precision bidirectional measuring tool according to the present invention;

[0041] Figure 3 This is a perspective view of an embodiment of a high-precision bidirectional measuring tool according to the present invention;

[0042] Figure 4 This is a schematic diagram of the state after marking the dimensions in an embodiment of a high-precision bidirectional measuring tool of this utility model.

[0043] The attached diagram shows the markings and corresponding component names:

[0044] 1. Base; 2. Small groove; 3. Large groove; 4. Small boss; 5. Large boss. Detailed Implementation

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

[0046] As one embodiment of this application, such as Figures 1-3 As shown, this embodiment provides a high-precision bidirectional measuring tool, including a base 1 and a boss detection unit for detecting the size of the lock opening and a groove detection unit for detecting the size of the lock tongue, which are integrated on the base 1.

[0047] The groove detection unit includes a large groove 3 for detecting the length of the latch and a small groove 2 for detecting the width of the latch;

[0048] The boss detection unit includes a large boss 5 for detecting the length of the lock opening and a small boss 4 for detecting the width of the lock opening.

[0049] Specifically: such as Figure 1 As shown, both sides of the large boss 5 and the small boss 4 are symmetrically provided with steps to form a boss structure with an upper limit size and a lower limit size; that is, both the large boss 5 and the small boss 4 have two size specifications, namely the boss with the upper limit size specification and the boss with the lower limit size specification; the size range between the upper limit size and the lower limit size of the large boss 5 and the small boss 4 respectively correspond to the qualified size range of the lock length and width.

[0050] Both the large groove 3 and the small groove 2 have symmetrical steps on their inner sidewalls, forming a groove structure with an upper limit and a lower limit. That is, both the large groove 3 and the small groove 2 have two size specifications, namely the groove with the upper limit size and the groove with the lower limit size. The size range between the upper limit size and the lower limit size of the large groove 3 and the small groove 2 corresponds to the qualified size range of the bolt length and width, respectively.

[0051] In one embodiment, such as Figure 1 As shown, the portions corresponding to the upper limit dimensions of the large boss 5 and the small boss 4 are located close to the base 1, that is, the width of the portion of the large boss 5 and the small boss 4 away from the base 1 is smaller than the width of the portion close to the base 1; the portions corresponding to the upper limit dimensions of the large groove 3 and the small groove 2 are located close to the outer side of the base 1, that is, the width of the portion of the large groove 3 and the small groove 2 located inside the base 1 is smaller than the width of the portion close to the outer side of the base 1, thereby forming a stepped boss structure and a stepped groove structure, respectively.

[0052] In one embodiment, such as Figure 1 and Figure 3As shown, the large boss 5 and the small boss 4 are located on opposite sides of the base 1, and the large groove 3 and the small groove 2 are located on the other opposite sides of the base 1. The central axes of the large boss 5 and the small boss 4 are collinear, and the central axes of the large groove 3 and the small groove 2 are collinear. In this embodiment, a high-precision bidirectional measuring tool performs bidirectional detection. By integrating two detection units with opposite functions and complementary detection objects on the same measuring tool, the tool simultaneously detects the dimensions and fit relationships of two key components of a flap lock: the lock mouth and the lock tongue.

[0053] In one embodiment, such as Figure 1 and Figure 3 As shown, the substrate 1 in this embodiment has a square structure, the flatness of the substrate 1 is ≤0.01mm, and the thickness of the substrate 1 is 2-3mm. Specifically, the substrate 1 in this embodiment is made of 2mm thick stainless steel (304) material to form a 50mm×50mm square stainless steel substrate 1.

[0054] In one embodiment, such as Figure 1 and Figure 3 As shown, the large boss 5 and the small boss 4 of the boss detection unit are integrally formed with the base 1, and the large groove 3 and the small groove 2 of the groove detection unit are machined on the base 1 by milling.

[0055] In one embodiment, the corners of the substrate 1 are provided with a rounded corner structure, that is, the four right-angle corners of the substrate 1 are rounded, so that the four corners of the substrate 1 are smoother and the sharp edges of the corners are eliminated.

[0056] The specific implementation process is as follows:

[0057] Detection principle:

[0058] ① Interference fit determination: The lock opening size must allow the large boss 5 (26.9mm limit) to be inserted, and the small boss 4 (11.3mm limit) to be inserted but not.

[0059] ② Clearance fit judgment: The size of the latch must meet the requirement that the large groove 3 (lower limit of 26.3mm) cannot pass through, while the small groove 2 (lower limit of 10.8mm) can pass through.

[0060] The high-precision bidirectional measuring tool of this invention can achieve a detection accuracy of ±0.01mm, with the gap control range optimized to 0.1-0.3mm, and the detection efficiency is improved.

[0061] To enable the measurement of various dimensions of the lock opening and latch on the panel of a railway passenger car flap lock, the measuring tools must be processed and measured to ensure they meet the required standards before use. For example... Figure 1 As shown, the measuring tool is made of 304 stainless steel. The 50mm×50mm square base 1 is machined, and the dimensions of the large groove 3, small groove 2, large boss 5 and small boss 4 are precisely manufactured according to the tolerance requirements.

[0062] See Figure 4 As shown, the high-precision bidirectional measuring tool of this utility model is divided into two parts: a groove detection unit, which is provided with a large groove 3 (locking tongue length) of 26.3-26.7mm and a small groove 2 (locking tongue width) of 10.8-11.2mm.

[0063] Boss detection unit: Set up a large boss 5 (lock length) with a diameter of 26.7-26.9mm and a small boss 4 (lock width) with a diameter of 11.1-11.3mm.

[0064] That is, the upper limit of the large groove 3 is 26.7mm and the lower limit is 26.3mm; the upper limit of the small groove 2 is 11.2mm and the lower limit is 10.8mm; the upper limit of the large boss 5 is 26.9mm and the lower limit is 26.7mm; the upper limit of the small boss 4 is 11.3mm and the lower limit is 11.1mm.

[0065] The testing process is as follows: During lock opening testing, the large protrusion 5 is inserted along the length of the lock opening, and the small protrusion 4 is tested for width. An interference fit is determined by whether it can be inserted or not. During bolt testing, the bolt is embedded into the large groove 3 (length direction) and the small groove 2 (width direction), and a clearance fit is determined by whether it can be passed through or not. This improves the accuracy and efficiency of testing the lock opening and bolt on flip lock panels.

[0066] This invention can inspect the dimensions of the lock opening and latch of a flap lock panel, improving the processing quality of flap locks and simplifying the measurement operation. The inspection time for a single piece is reduced to within 30 seconds, and the precision of the gap control is optimized to 0.1-0.3mm, eliminating locking failures caused by icing in winter.

[0067] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-precision bidirectional detection gauge, characterized in that, It includes a base and a boss detection unit for detecting the size of the lock opening and a groove detection unit for detecting the size of the lock tongue, both integrated on the base. The groove detection unit includes a large groove for detecting the length of the latch and a small groove for detecting the width of the latch. The boss detection unit includes a large boss for detecting the length of the lock opening and a small boss for detecting the width of the lock opening.

2. The high-precision bidirectional detection gauge according to claim 1, characterized in that, Both the large and small protrusions have symmetrical steps on both sides to form a protrusion structure with an upper limit and a lower limit; the size range between the upper limit and the lower limit of the large and small protrusions respectively corresponds to the qualified size range of the lock length and width. The inner walls of the large groove and the small groove are symmetrically provided with steps to form a groove structure with an upper limit size and a lower limit size. The size range between the upper limit size and the lower limit size of the large groove and the small groove respectively corresponds to the qualified size range of the bolt length and width.

3. The high-precision bidirectional detection gauge according to claim 1, characterized in that, The large protrusion and the small protrusion are located on opposite sides of the substrate, and the large groove and the small groove are located on the other opposite sides of the substrate.

4. A high-precision bidirectional measuring instrument according to claim 3, characterized in that, The central axes of the large boss and the small boss are collinear, and the central axes of the large groove and the small groove are collinear.

5. A high-precision bidirectional measuring instrument according to claim 3, characterized in that, The substrate has a square structure and a flatness of ≤0.01mm.

6. A high-precision bidirectional measuring instrument according to claim 2, characterized in that, The portions corresponding to the upper limit dimensions of the large and small protrusions are located close to the base, while the portions corresponding to the upper limit dimensions of the large and small grooves are located close to the outer side of the base.

7. A high-precision bidirectional measuring instrument according to claim 1, characterized in that, The corners of the substrate are rounded.

8. A high-precision bidirectional measuring instrument according to claim 1, characterized in that, The substrate is a stainless steel substrate.

9. A high-precision bidirectional measuring instrument according to claim 1, characterized in that, The large and small protrusions of the protrusion detection unit are integrally formed with the substrate, and the large and small grooves of the groove detection unit are machined on the substrate by milling.

10. A high-precision bidirectional measuring instrument according to claim 9, characterized in that, The thickness of the substrate is 2-3 mm.

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