Detection method for wear of flameproof joint surface of flameproof charging box in underground coal mine

Abstract

The present invention discloses a method for detecting wear of the flameproof joint surface of a flameproof charging box in an underground coal mine, which relates to the field of explosion protection. The method comprises a flameproof door body and a flameproof box body, and the joint surface between the two is a flameproof joint surface. The flameproof door body is installed tightly against the flameproof box body to form a closed cavity inside the charging box. At least three detection holes are punched on the flameproof joint surface of the flameproof box body. The three detection holes are distributed in a triangular shape on the flameproof joint surface, and the three detection holes are distributed on any three sides of the flameproof joint surface. The present invention is a method for detecting wear of the flameproof joint surface. When the wear of the flameproof joint surface reaches a certain degree and is about to fail, a signal is output to the outside to remind maintenance and replacement, and to terminate the use of the flameproof charging box.

Description

Technical Field

[0001] The present invention belongs to the field of explosion-proof technology, mainly relates to the field of explosion-proof technology in underground coal mines, and specifically relates to a method for detecting wear of the explosion-proof joint surface of an underground coal mine explosion-proof charging box. Background Art

[0002] As patrol robots become increasingly common in coal mines, charging them has always been a significant issue. To address this issue, companies and practitioners within the industry have devised a variety of charging solutions, including one that allows the robot to automatically move into an explosion-proof box for charging. This solution involves the robot automatically moving into a flameproof charging box with an automatic quick-opening door when it needs to be charged. When the robot enters the charging box, the door automatically closes, creating a closed, flameproof charging space. This device is called a flameproof charging box. The quick-opening door of the explosion-proof charging box must meet the relevant design standards for the flameproof joint surface. Frequent opening and closing of the quick-opening door creates a risk of wear on the flameproof joint surface. When this wear reaches a certain level, the explosion-proof box could potentially fail. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method for detecting wear on the flameproof joint surface of a flameproof charging box in underground coal mines, so as to solve the problems of wear and explosion loss in current explosion-proof boxes and difficulty in detection.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a method for detecting the wear of the flameproof joint surface of a flameproof charging box in an underground coal mine is disclosed, comprising a flameproof door body and a flameproof box body, and the joint surface between the two is a flameproof joint surface, the flameproof door body is installed tightly against the flameproof box body to form a closed cavity inside the charging box, at least three detection holes are punched on the flameproof joint surface of the flameproof box body, the three detection holes are distributed in a triangular shape on the flameproof joint surface, and the three detection holes are distributed on any three sides of the flameproof joint surface; an insulating shell is provided in the detection hole, and a spring pin is provided at the lower part of the insulating shell, a lead wire is installed at one end of the spring pin away from the flameproof joint surface, and the lead wire is electrically connected to an external control system, a wear control area is provided at one end of the spring pin close to the flameproof box body, and the outer side of the wear control area is tightly against the flameproof box body; after the wear control area is worn, the spring pin pops out and short-circuits with the flameproof joint surface on the flameproof box body, and determines whether the flameproof joint surface is worn by detecting the on signal or off signal in the control system.

[0005] Furthermore, the hardness of the material filled in the wear control area is between HRC20-30 and it is non-conductive. The wear control area needs to wear together with the explosion-proof joint surface, so the material of the wear control area cannot be too hard, otherwise the wear degree of the wear control area will be less than that of the explosion-proof joint surface and the alarm signal cannot be transmitted when an explosion failure occurs. The material of the wear control area cannot be too soft, otherwise when the wear of the wear control area does not cause the spring pin to pop out and alarm, the explosion-proof joint surface is actually not worn to the explosion failure degree.

[0006] Furthermore, the thickness of the wear control zone is between 0.08 and 0.2 mm, and the explosion-proof gap requirement is generally less than 0.2 mm. Since this structure is an explosion-proof method underground in a coal mine, the degree of wear is controlled between 0.08 and 0.2 mm, which can ensure that the wear is within a safe range and will not cause safety accidents due to explosion failure. It effectively prevents explosion problems and improves safety. At the same time, in specific use, the thickness of the wear control zone can be controlled according to different explosion-proof requirements, and it can be thickened or thinned.

[0007] Furthermore, the surface roughness of the explosion-proof joint surface is Ra=6.3. The explosion-proof joint surface is the part where the corresponding surfaces of different parts of the explosion-proof enclosure fit together or the enclosure is connected, and the flame or combustion products may be transmitted from the inside of the enclosure to the outside of the enclosure. Generally, the explosion-proof joint surface that has been machined can meet the requirements of this standard and ensure the control of wear.

[0008] Furthermore, the three detection holes form the three vertices of a triangle to determine a plane. The three detection holes are located at the contact position between any surface of any three sides of the explosion-proof joint surface and another explosion-proof joint surface. As long as the three detection holes form a plane, the degree of wear can be controlled. When any detection hole is not on the plane, it proves that the explosion-proof structure has excessive wear and there is a risk of explosion failure in the charging box structure.

[0009] Furthermore, the spring needle is a compression spring needle, which is tightly attached to the wear control area and is pressed by the wear control area, thereby ensuring that when the wear control area is completely worn out, the spring needle can pop out in time and contact the surface of the explosion-proof joint surface on the explosion-proof door body, thereby issuing an alarm signal that the wear of the explosion-proof joint surface may cause explosion failure.

[0010] Furthermore, after the spring needle pops out, it is electrically connected to the detection end through the lead wire, and the detection end is electrically connected to the control system. The control is provided with an alarm that senses the wear of the explosion-proof joint surface, so that when the explosion-proof joint surface is worn, an early warning can be issued in time to remind the staff to replace the explosion-proof joint surface, thereby reducing labor costs. There is no need to regularly detect and measure the degree of wear of the explosion-proof joint surface. When the wear reaches a certain degree, the system only needs to automatically send a signal before replacement or maintenance is required.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The present invention can effectively detect the wear of the explosion-proof joint surface. By setting different thicknesses of the wear control zone, different degrees of wear can be detected. That is, the degree of wear detected can be controlled. At the same time, the present invention does not introduce more complicated procedures and only adds a small cost to the technical system of the existing product.

[0013] 2. The thickness detected by the present invention is controllable without introducing complex instruments and meters. The system utilizes mature technology and the principle is stable and reliable. The present invention can be used not only in the detection of the explosion-proof joint surface of the quick-opening door of the charging box for the inspection robot, but also in the detection of any explosion-proof joint surface in the coal mine. Only slight changes are needed to the existing explosion-proof joint surface to increase the detection function of the explosion-proof joint surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the cross-sectional structure of the method for detecting wear of the flameproof joint surface of the flameproof charging box in an underground coal mine according to the present invention;

[0015] Figure 2 It is a front view of the flameproof door body of the flameproof joint surface wear detection method of the flameproof charging box in an underground coal mine of the present invention;

[0016] Figure 3 It is a structural schematic diagram of the flameproof door body of the flameproof joint surface wear detection method of the flameproof charging box in an underground coal mine of the present invention;

[0017] Figure 4 It is a structural schematic diagram of the flameproof box of the flameproof joint surface wear detection method of the flameproof charging box in the coal mine underground;

[0018] Figure 5 Schematic diagram of the structure of the detection end of the method for detecting wear of the flameproof joint surface of the flameproof charging box in an underground coal mine according to the present invention;

[0019] Figure 6 This is a structural diagram of the present invention's method for detecting wear on the flameproof joint surface of a flameproof charging box in an underground coal mine when used on the charging box;

[0020] Figure 7 It is a structural schematic diagram of the method for detecting wear of the flameproof joint surface of the flameproof charging box in an underground coal mine according to the present invention when used on the charging box.

[0021] Reference numerals:

[0022] 1. Explosion-proof door; 2. Explosion-proof box; 3. Explosion-proof joint surface; 4. Detection hole; 5. Lead wire; 6. Insulation shell; 7. Spring pin; 8. Wear control area; 9. Detection end. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0024] In the present invention, the serial numbers assigned to the components, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application include direct or indirect connection unless otherwise specified. It should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0025] Currently, several technical solutions for wear detection exist: 1. Ultrasonic detection. This method utilizes the reflection of ultrasound waves at the interfaces of different materials and uses the time difference between the reflections at the two interfaces to calculate the object's thickness. As wear occurs, the object's thickness changes, and the time difference between the reflections decreases, allowing the wear degree to be measured. This method is effective for detecting large dimensional differences, but is more challenging for detecting small variations, such as those on the order of 0.1 mm. 2. A common wear detection method for gearboxes involves periodically extracting the lubricating oil from the gearbox to measure the metal powder content. When the metal powder content reaches a certain level, the wear is considered severe enough, and the gearbox gears are repaired. However, this method is only suitable for wear detection in sealed containers and is not suitable for wear detection of flameproof surfaces. Furthermore, this method lacks real-time detection and cannot provide timely warnings of impending explosion failure. 3. Manual measurement of the flameproof surface using tools and instruments. While this method can detect wear on the flameproof surface, the thousands of pieces of equipment underground require flameproof surface inspection. While incurring huge labor costs, this also places higher demands on the professional skills of testers. This patent perfectly solves the shortcomings and deficiencies of the above solutions by using cross-industry knowledge and theories, without adding any additional costs to the use of the product.

[0026] like Figure 1-4As shown, a method for detecting wear of the flameproof joint surface of a flameproof charging box in an underground coal mine is disclosed, comprising a flameproof door body 1 and a flameproof box body 2, wherein the joint surface between the two is a flameproof joint surface 3, the flameproof door body 1 is installed tightly against the flameproof box body 2 to form a closed cavity inside the charging box, and at least three detection holes 4 are punched on the flameproof joint surface 3 of the flameproof box body 2, and the three detection holes 4 are distributed in a triangular shape on the flameproof joint surface 3, and the three detection holes 4 are distributed on any three sides of the flameproof joint surface 3; an insulating shell 6 is provided in the detection hole 4 A spring pin 7 is provided at the lower part of the insulating shell 6, and a lead wire 5 is installed at the end of the spring pin 7 away from the flameproof joint surface 3. The lead wire 5 is electrically connected to the external control system. A wear control area 8 is provided at the end of the spring pin 7 close to the flameproof box body 2, and the outer side of the wear control area 8 is close to the flameproof box body 2; after the wear control area 8 is worn, the spring pin 7 pops out and short-circuits with the flameproof joint surface 3 on the flameproof box body 2, and whether the flameproof joint surface 3 is worn is determined by detecting the on signal or off signal in the control system.

[0027] like Figure 5-7 As shown, the hardness of the material filled in the wear control area 8 is between HRC20-30 and is non-conductive. The wear control area 8 needs to wear together with the explosion-proof joint surface 3, so the material of the wear control area 8 cannot be too hard, otherwise the wear degree of the wear control area 8 is less than that of the explosion-proof joint surface 3 and the alarm signal cannot be transmitted when an explosion failure occurs. The material of the wear control area 8 cannot be too soft, otherwise when the wear of the wear control area 8 does not cause the spring pin 7 to pop out and alarm, in fact, the explosion-proof joint surface 3 is not worn to the explosion failure degree.

[0028] Preferably, the thickness of the wear control zone 8 is between 0.08-0.2 mm, and the explosion-proof gap requirement is generally less than 0.2 mm. Since this structure is an explosion-proof method underground in a coal mine, the degree of wear is controlled between 0.08-0.2 mm, which can ensure that the wear is within a safe range and will not cause safety accidents due to explosion failure. It effectively prevents explosion problems and improves safety. At the same time, in specific use, the thickness of the wear control zone 8 can be controlled according to different explosion-proof requirements, and it can be thickened or thinned.

[0029] Preferably, the surface roughness of the flameproof joint surface 3 is Ra=6.3. The flameproof joint surface 3 is the part where the corresponding surfaces of different parts of the flameproof enclosure fit together or the enclosure is connected, and the flame or combustion products may be transmitted from the inside of the enclosure to the outside of the enclosure. Generally, the flameproof joint surface 3 that has been machined can meet the requirements of this standard and ensure control of wear.

[0030] Preferably, the three detection holes 4 form a plane with three vertices of a triangle, and the three detection holes 4 are located at the contact position between any surface of any three sides of the explosion-proof joint surface 3 and another explosion-proof joint surface 3. As long as the three detection holes 4 form a plane, the degree of wear can be controlled. When any detection hole 4 is not on the plane, it proves that the explosion-proof structure has excessive wear and there is a risk of explosion failure in the charging box structure.

[0031] Preferably, the spring pin 7 is a compression spring pin 7, which is in close contact with the wear control area 8 and is compressed by the wear control area 8. This ensures that when the wear control area 8 is completely worn, the compression spring pin 7 can be promptly ejected to contact the surface of the flameproof joint surface 3 on the flameproof door body 1, thereby issuing an alarm signal indicating that the wear of the flameproof joint surface 3 may cause explosion failure. After the compression spring pin 7 is ejected, it is electrically connected to the detection end 9 via the lead wire 5. The detection end 9 is electrically connected to the control system, and the control is provided with an alarm for sensing the wear of the flameproof joint surface 3. When the flameproof joint surface 3 is worn, an early warning can be issued in time to remind the staff to replace the flameproof joint surface 3, thereby reducing labor costs. There is no need to regularly detect and measure the degree of wear of the flameproof joint surface 3. When the wear reaches a certain degree, the system automatically sends a signal and then replaces or repairs it.

[0032] When the explosion-proof joint surface 3 is worn and the wear control area 8 disappears due to wear, the support force of the wear control area 8 for the spring needle 7 is insufficient. At this time, the spring needle 7 in the detection hole 4 will pop out. The spring needle 7 is short-circuited with the explosion-proof joint surface 3, and the lead wire 5 is electrically connected to the detection end 9. When the control center detects this signal, it can be known that the explosion-proof joint surface 3 may fail due to wear. This connection signal is detected as an alarm signal for the failure of the explosion-proof joint surface 3. Since the three points determine a plane, when an explosion failure alarm signal is issued at any detection point, it represents that the entire explosion-proof joint surface 3 fails. Since the explosion-proof door body 1 and the explosion-proof box body 2 are made of the same material, wear may occur simultaneously on the two corresponding explosion-proof joint surfaces 3. The same method can also be used to design a detection hole 4 on the explosion-proof joint surface 3 of the explosion-proof box body 2, so that the wear on both sides of the explosion-proof box body 2 and the explosion-proof door body 1 can be detected. The electrical connection mentioned in the text represents the transmission of electrical signals, that is, electrical connection.

[0033] The above is only an embodiment of the present invention. Common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the guidance of this application. Some typical well-known structures or well-known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for detecting wear of the flameproof joint surface of a flameproof charging box in an underground coal mine, characterized by: The flameproof door body and the flameproof box body are connected to form a flameproof joint surface. The flameproof door body is installed tightly against the flameproof box body to form a closed cavity inside the charging box. The flameproof joint surface of the flameproof box body is provided with at least three detection holes. The three detection holes are distributed in a triangular shape on the flameproof joint surface. The three detection holes are distributed on any three sides of the flameproof joint surface. An insulating shell is provided in the detection hole, and a spring pin is provided at the lower part of the insulating shell. A lead wire is installed at one end of the spring pin away from the flameproof joint surface, and the lead wire is electrically connected to an external control system. A wear control area is provided at one end of the spring pin close to the flameproof box, and the outer side of the wear control area is in close contact with the flameproof box. After the wear control area is worn, the spring pin pops out and short-circuits with the flameproof joint surface on the flameproof box body, and whether the flameproof joint surface is worn is determined by detecting the connection signal and the disconnection signal in the control system.

2. The method for detecting wear of the flameproof joint surface of the flameproof charging box in an underground coal mine according to claim 1, characterized in that: The flameproof joint surface is made of metal.

3. The method for detecting wear of the flameproof joint surface of the flameproof charging box in an underground coal mine according to claim 1, characterized in that: The material filled in the wear control area has a hardness between HRC20-30 and is non-conductive.

4. The method for detecting wear of the flameproof joint surface of a flameproof charging box in an underground coal mine according to claim 1, characterized in that: The thickness of the wear control zone is between 0.08 and 0.2 mm.

5. The method for detecting wear of the flameproof joint surface of the flameproof charging box in an underground coal mine according to claim 1, characterized in that: The surface roughness of the flameproof joint surface is Ra=6.

3.

6. The method for detecting wear of the flameproof joint surface of the flameproof charging box in an underground coal mine according to claim 1, characterized in that: The three vertices of the triangle formed by the three detection holes define a plane, and the three detection holes are located at the contact position between any surface of any three sides of the explosion-proof joint surface and another explosion-proof joint surface.

7. The method for detecting wear of the flameproof joint surface of a flameproof charging box in an underground coal mine according to claim 1, characterized in that: The spring pin is a compression spring pin, and the compression spring pin is in close contact with the wear control area and is pressed by the wear control area.

8. The method for detecting wear of the flameproof joint surface of a flameproof charging box in an underground coal mine according to claim 1, characterized in that: After the spring pin pops out, it is electrically connected to the detection end through the lead wire, and the detection end is electrically connected to the control system. The control system is provided with an alarm that senses the wear of the flameproof joint surface.

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