A method for quickly and accurately measuring the width of an explosion-proof joint surface

Abstract

The present invention belongs to the technical field of explosion-proof casings. It relates to a method for quickly and accurately measuring the width of an explosion-proof joint surface. By using an image scanning device to respectively collect the contour information of the joint surfaces on the cover plate and the flange, as well as the mounting holes on the joint surfaces, taking each pair of aligned mounting holes when the cover plate and the flange are connected as the positioning reference, generating multiple potential joint contours between the flange and the cover plate by moving the joint surface, then calculating the shortest joint surface width of each potential joint contour, and taking the minimum value, which is the width of the explosion-proof joint surface. The present invention uses image scanning to obtain the contour information of the joint surface, converts physical data into electronic data, and performs fitting simulation calculations of the joint surface through software, realizing the accurate measurement of the width of the explosion-proof joint surface, with fast measurement speed and high efficiency. At the same time, according to requirements, the switching between multiple levels of precision can be achieved by changing the moving amount.

Description

Technical Field

[0001] The present invention belongs to the technical field of explosion-proof shells, and relates to a method for quickly and accurately measuring the width of an explosion-proof joint surface. Background Art

[0002] An explosion-proof shell, also known as a pressure-resistant explosion-proof shell, can withstand the explosion pressure of the internal explosive mixture and prevent the explosion from spreading to the explosive mixture outside the shell. It is widely used in mines with explosive environments such as gas and dust. The joint surface gap and width between the cover plate and the flange play a role in extinguishing and cooling the flame inside the shell, and are one of the most critical factors affecting the explosion-proof performance. At present, the measurement of the joint surface gap is relatively mature and accurate, but there are still problems such as large errors and low efficiency in the measurement of the joint surface width.

[0003] The shortest path from the inside of the explosion-proof shell through the joint surface to the outside of the explosion-proof shell is called the width of the explosion-proof joint surface. In terms of measurement, the most commonly used method at present is to use a vernier caliper combined with visual inspection to measure the shortest distance between the inner and outer contours of the explosion-proof surfaces of the shell cover plate and the flange respectively, and then take the smaller value as the width of the explosion-proof joint surface.

[0004] The shortest distance between the inner and outer contours of the explosion-proof surfaces of the cover plate and the flange is measured with a vernier caliper after a rough visual observation by the naked eye. It is difficult to measure the minimum distance, resulting in large errors, generally about 1 - 2 mm. Experienced inspectors are required to measure the distance between the inner and outer contours of the explosion-proof surface at multiple points and multiple times. High requirements are placed on the experience and proficiency of the personnel, and the measurement efficiency is low.

[0005] After the cover plate and the flange are actually assembled, misalignment may occur, resulting in the actual joint surface width being less than the minimum distance between the inner and outer contours of the explosion-proof surfaces of the cover plate or the flange. This error value is related to the machining accuracy of the holes, generally about 1 - 2 mm. After the above-mentioned first and third errors are cumulatively superimposed, it can reach about 2 - 4 mm, resulting in large errors in the measurement of the explosion-proof joint surface width, making it difficult to achieve accurate measurement, and may even lead to the explosion-proof shell losing its explosion-proof function and triggering major safety accidents such as gas explosions. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to solve the problem of measuring the width of the explosion-proof joint surface, and propose a method for quickly and accurately measuring the width of the explosion-proof joint surface.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A rapid and precise measurement method for the width of flameproof joint surfaces. The contour information of the joint surfaces on the cover plate and the flange, as well as the mounting holes on the joint surfaces, is collected by an image scanning device. Taking each pair of aligned mounting holes when the cover plate and the flange are connected as the positioning reference, multiple potential joint contours between the flange and the cover plate are generated by moving the joint surface, and then the shortest joint surface width of each potential joint contour is calculated, and the minimum value is taken, and this minimum value is the width of the flameproof joint surface.

[0009] Furthermore, according to the collected contour information of the mounting holes on the cover plate and the flange, the n mounting holes on the cover plate are sequentially named A1, A2…Ai…An; the n mounting holes on the flange are sequentially named B1, B2…Bi…Bn; among them, Ai is aligned with Bi when the cover plate and the flange are connected, and i takes values from 1 to n;

[0010] Take a set of mounting holes Ai and Bi, place Ai and Bi coaxially, and the radius gap between Ai and Bi is δ; move Bi along the radial direction and the circumferential direction respectively with a unit movement amount within the radius gap δ. Each time it moves, a combined contour of the cover plate and the flange is obtained until all the mounting holes are moved, and multiple combined contours of the cover plate and the flange are obtained, and a combined contour in which no interference occurs between any group of mounting holes is selected from all the combined contours as the potential joint contour.

[0011] Furthermore, divide the radius gap δ equally into p parts according to the circumferential angle, and the movement amounts of the flange contour along the circumferential direction are respectively 1*360° / p, 2*360° / p, 3*360° / p…(p - 1)*360° / p, 360°; at the same time, at the radial direction corresponding to each angular position, divide δ into q parts, and the movement amounts d of the flange contour along the radial direction are respectively 1*δ / q, 2*δ / q, 3*δ / q…(q - 1)*δ / q;

[0012] Taking the equal division points of Bi as the tangent points, first move along the radial direction at one of the circumferential angle positions. After moving to each equal division point, rotate 360° in m equal parts with the center of Bi as the center point, and then move to the next circumferential angle position for radial movement until all the circumferential angle positions are moved, and m*(p*q + 1) combined contours are obtained. A total of m*n*(p*q + 1) combined contours are obtained for n mounting holes; then a combined contour in which no interference occurs between any group of mounting holes is selected from all the combined contours as the potential joint contour.

[0013] The beneficial effects of the present invention are as follows:

[0014] The present invention obtains the profile information of the joint surface by image scanning, converts physical data into electronic data, and performs fitting simulation calculations on the joint surface through software, achieving precise measurement of the width of the explosion-proof joint surface, with fast measurement speed and high efficiency. At the same time, according to requirements, switching between multiple levels of precision can be achieved by changing the movement amount.

[0015] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following specification. Brief Description of the Drawings

[0016] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0017] Figure 1 It is the cover plate profile in the present invention.

[0018] Figure 2 It is the flange profile in the present invention.

[0019] Figure 3 It is the combined profile formed by the flange and cover plate profiles in the present invention.

[0020] Figure 4 It is the equal division schematic diagram of the installation hole clearance in the present invention.

[0021] Figure 5 It is the schematic diagram of the joint surface obtained according to the potential joint profile.

[0022] Figure 6 It is from Figure 5 The schematic diagram of the joint surface width L obtained.

[0023] Reference numerals: 1. Cover plate profile; 2. Flange profile. Detailed Embodiments

[0024] The following illustrates the embodiments of the present invention through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention schematically, and the following embodiments and the features in the embodiments can be combined with each other without conflict.

[0025] Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams rather than actual diagrams, and should not be construed as a limitation on the present invention; in order to better illustrate the embodiments of the present invention, some components in the attached drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0026] In the attached drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] Please refer to Figures 1 to 6 , which is a method for quickly and accurately measuring the width of the flameproof joint surface. By using an image scanning device, the profiles of the cover plate 1, the flange 2, and the mounting holes on the joint surface are collected respectively. Taking each pair of mounting holes aligned when the cover plate and the flange are connected as the positioning reference, multiple potential joint profiles between the flange and the cover plate are generated by moving the joint surface, and then the shortest joint surface width of each potential joint profile is calculated, and the minimum value is taken, and this minimum value is the width of the flameproof joint surface.

[0028] According to the collected profile information of the mounting holes of the cover plate and the flange, the n mounting holes on the cover plate are sequentially named A1, A2... Ai... An; the n mounting holes on the flange are sequentially named B1, B2... Bi... Bn; among them, when the cover plate and the flange are connected, Ai is aligned with Bi, and i takes 1 to n;

[0029] Take a set of mounting holes Ai and Bi, place Ai and Bi coaxially, and the radius gap between Ai and Bi is δ; move Bi along the radial direction and the circumferential direction with a unit movement amount within the radius gap δ. Each time it moves, a combined profile of the cover plate and the flange is obtained. Until all the mounting holes are moved, multiple combined profiles of the cover plate and the flange are obtained, and among all the combined profiles, a combined profile in which any set of mounting holes does not interfere is selected as the potential joint profile.

[0030] Please refer to Figure 4, the radius gap δ is evenly divided into p parts according to the circumferential angle, and the displacement amounts of the flange contour along the circumferential direction are respectively taken as 1*360° / p, 2*360° / p, 3*360° / p…(p - 1)*360° / p, 360°; at the same time, in the radial direction corresponding to each angular position, δ is evenly divided into q parts, and the displacement amounts d of the flange contour along the radial direction are respectively taken as 1*δ / q, 2*δ / q, 3*δ / q…(q - 1)*δ / q;

[0031] Taking the equally divided points as the tangent points, first move along the radial direction at one of the circumferential angular positions. After moving to each equally divided point, perform a 360° rotation in m equal parts with the center of Bi as the center point, then move to the next circumferential angular position for radial movement until all circumferential angular positions are completed, obtaining m*(p*q + 1) combined contours. A total of m*n*(p*q + 1) combined contours are obtained for n mounting holes; then, select from all the combined contours the combined contours where no interference occurs among any group of mounting holes as the potential mating contours, calculate the minimum width L of the mating surface in each potential mating contour, and compare them. Take the minimum value of L as the flameproof joint surface width.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A method for quickly and accurately measuring the width of an explosion-proof joint surface, characterized in that: The contour information of the joint surface and the mounting holes on the joint surface of the cover plate and the flange are respectively collected by an image scanning device. Taking each pair of mounting holes aligned when the cover plate and the flange are connected as the positioning reference, multiple potential joint contours between the flange and the cover plate are generated by moving the joint surface, and then the shortest joint surface width of each potential joint contour is calculated, and the minimum value is taken, and this minimum value is the width of the explosion-proof joint surface; According to the collected contour information of the mounting holes of the cover plate and the flange, the n mounting holes on the cover plate are sequentially named A1, A2... Ai... An; the n mounting holes on the flange are sequentially named B1, B2... Bi... Bn; among them, Ai and Bi are aligned when the cover plate and the flange are connected, and i takes 1 to n; Take a set of mounting holes Ai and Bi, place Ai and Bi coaxially, and the radius gap between Ai and Bi is δ; Bi is moved within the radius gap δ in the radial direction and the circumferential direction with a unit movement amount respectively. Each time it is moved, a combined contour of the cover plate and the flange is obtained until all the mounting holes are moved, and multiple combined contours of the cover plate and the flange are obtained, and a combined contour in which any set of mounting holes does not interfere is selected from all the combined contours as the potential joint contour; The radius gap δ is evenly divided into p parts by the circumferential angle, and the movement amounts of the flange contour in the circumferential direction are respectively 1*360º / p, 2*360º / p, 3*360º / p... (p-1)*360º / p, 360 º; at the same time, at the radial direction corresponding to each angular position, δ is evenly divided into q parts, and the movement amount d of the flange contour in the radial direction is respectively 1*δ / q, 2*δ / q, 3*δ / q... (q-1)*δ / q; Bi takes the equal division point as the tangent point, first moves in the radial direction at one of the circumferential angular positions. After moving to each equal division point, it rotates 360° in m equal divisions with the center of Bi as the center, and then moves to the next circumferential angular position for radial movement until all the circumferential angular positions are completed, and m*(p*q+1) combined contours are obtained. A total of m*n*(p*q+1) combined contours are obtained for the n mounting holes; then a combined contour in which any set of mounting holes does not interfere is selected from all the combined contours as the potential joint contour.

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