A mine explosion-proof protection device and a manufacturing method thereof

Abstract

The application discloses a mine explosion-proof protection device and a manufacturing method thereof, and relates to the technical field of underground phase sequence protection equipment. The device comprises an explosion-proof shell, components and elements are arranged in the explosion-proof shell, the components and elements comprise a transformer and a phase sequence relay, an input end of the transformer is electrically connected with an external power supply, an output end of the transformer is electrically connected with an input end of the phase sequence relay, and an output end of the phase sequence relay can be electrically connected with an electric equipment. The manufacturing method comprises the following steps: S1, processing the explosion-proof shell and preparing the components and elements; S2, assembling the explosion-proof shell and the components and elements; S3, electrical testing; S4, equipment identification; S5, packaging; and S6, storage. The application can effectively monitor the connection of the phase sequence of the underground electric equipment, thereby improving the actual use safety of the underground electric equipment.

Description

Technical Field

[0001] This invention relates to the field of underground phase sequence protection equipment technology, and in particular to a mine explosion-proof protection device and its manufacturing method. Background Technology

[0002] Reversing the power phase sequence during the use of electromechanical equipment can lead to accidents or equipment damage, such as elevators, central air conditioning systems, overhead cranes, and motors.

[0003] Due to the unique working environment and special requirements of underground electrical equipment, there is currently no independent multi-functional protection device for coal mines that can provide relay protection against phase reversal, phase loss, overvoltage, undervoltage, and load imbalance. For example, mine cooling systems, explosion-proof refrigeration systems, and explosion-proof pre-cooling and reheating air drying systems all contain irreversible transmission equipment, such as screw compressors and fans. If these devices operate under conditions of phase reversal, phase loss, overvoltage, undervoltage, or load imbalance, it can lead to equipment damage or even serious accidents. For instance, if a screw compressor reverses, the screw may seize up, causing severe losses to both coal mine production and the equipment itself. Reversing the cooling fan can cause localized overheating, leading to the shutdown of the entire system. A phase loss in the motors used in underground equipment can cause motor burnout.

[0004] Therefore, there is an urgent need in the field for a mine explosion-proof protection device and its manufacturing method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a mine explosion-proof protection device and its manufacturing method to solve the problems existing in the prior art, and to effectively monitor the phase sequence of underground electrical equipment, thereby ensuring the safety of underground electrical equipment.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention discloses a mine explosion-proof protection device, including an explosion-proof housing. The explosion-proof housing contains components, including a transformer and a phase sequence relay. The input terminal of the transformer is electrically connected to an external power source, and the output terminal of the transformer is electrically connected to the input terminal of the phase sequence relay. The output terminal of the phase sequence relay can be electrically connected to underground electrical equipment.

[0007] Preferably, the explosion-proof enclosure includes an explosion-proof box and an explosion-proof cover. The explosion-proof box is provided with a box flange, and the explosion-proof cover is provided with a cover flange. The box flange and the cover flange are connected by flange bolts.

[0008] Preferably, the explosion-proof enclosure has a cylindrical structure, and the explosion-proof cover has a circular structure.

[0009] Preferably, the explosion-proof housing is provided with a relay slide rail, the phase sequence relay is slidably connected to the relay slide rail, and the relay slide rail is provided with a limiting bolt, which can abut against the phase sequence relay.

[0010] Preferably, the transformer is provided with a terminal block, and the terminals on the terminal block are movable relative to the transformer.

[0011] Preferably, the inner wall of the explosion-proof enclosure is provided with an internal grounding device, and the outer wall of the explosion-proof enclosure is provided with an external grounding device and a cable connection device.

[0012] This invention discloses a method for manufacturing a mine explosion-proof protection device, which includes the following steps: S1. Process the explosion-proof enclosure and prepare the components; S2. Assemble the explosion-proof enclosure and components; S3, Electrical Testing; S4, Equipment Identification; S5. Packaging; S6, Warehousing.

[0013] Preferably, the explosion-proof housing processing in step S1 includes the following steps: S101, blanking and machining; S102, solder resist; S103, Time-sensitive processing; S104, flameproof surface processing; S105. Conduct a hydrostatic test and inspect the explosion-proof surface; S106, Spray painting.

[0014] Preferably, the preparation of components in step S1 includes the following steps: S107, Procurement of Components; S108. Acceptance of components; S109. Power-on test of components; S110. Qualified products after power-on inspection are put into storage.

[0015] Preferably, the electrical test in step S3 includes the following steps: S301. Perform power frequency withstand voltage test and insulation resistance test; S302. Perform a power-on test; S303. Conduct actual use and operation testing; S304. Conduct aging tests.

[0016] The present invention achieves the following technical effects compared to the prior art: This invention involves installing a phase sequence relay between the underground electrical equipment and the external power source. This relay allows for monitoring the phase sequence of the power supply. Furthermore, since the device is used in an underground environment, the phase sequence relay is housed in an explosion-proof enclosure. This enclosure provides explosion protection for the relay, thereby improving safety during underground use. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is an external schematic diagram of the explosion-proof protection device for mines, as shown in Example 1. Figure 2 This is an internal schematic diagram of the explosion-proof protection device for mines, as shown in Example 1. Figure 3 This is a general flowchart of the manufacturing method of the explosion-proof protection device for mines in Example 2; Figure 4 This is a detailed flowchart of the manufacturing method of the explosion-proof protection device for mines in Example 2; In the diagram: 1-Explosion-proof enclosure; 101-Explosion-proof box; 102-Explosion-proof cover; 2-Phase sequence relay; 3-Relay slide rail; 4-Terminal block; 5-Internal grounding device; 6-External grounding device; 7-Cable connection device; 8-Nameplate; 9-Lifting ring. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a mine explosion-proof protection device and its manufacturing method to solve the problems existing in the prior art, and to effectively monitor the phase sequence of underground electrical equipment, thereby ensuring the safety of underground electrical equipment.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 like Figures 1-2 As shown, this embodiment provides a mine explosion-proof protection device, including an explosion-proof housing 1. Components are housed within the explosion-proof housing 1, and the explosion-proof performance of the housing 1 provides explosion protection for the components. The components include a transformer and a phase sequence relay 2. Of course, technicians can add other components required for circuit connections, not just these two. The input terminal of the transformer is electrically connected to an external power source via a wire. The external power source can be a commonly used three-phase power source in mines. The output terminal of the transformer is electrically connected to the input terminal of the phase sequence relay 2 via a wire. The phase sequence relay 2 (also known as a phase sequence protector) is a three-phase power monitoring and protection device used in industrial equipment. It achieves protection functions by detecting parameters such as the phase sequence and voltage of the three-phase power supply. When a phase sequence error, phase loss, overvoltage, undervoltage, or voltage imbalance occurs, the control circuit will be cut off. The output terminal of the phase sequence relay 2 can be electrically connected to underground electrical equipment via a wire.

[0023] In practical use, the three-phase power supply to be tested is introduced to the input terminal of the transformer. After the power is stepped down by the transformer, it is connected to the input terminal of phase sequence relay 2. Phase sequence relay 2 monitors whether the phase sequence of the three-phase power supply is normal. When the three phases are complete and the phase sequence is correct (clockwise rotation), the output phase sequence relay 2 operates; when the phase sequence is incorrect or a phase is missing, phase sequence relay 2 resets, the yellow LED goes out, the normally open contact opens, and the normally closed contact closes. Then, the wiring at the transformer input terminal is changed to restore phase sequence relay 2 to the positive phase sequence. At this time, output phase sequence relay 2 should operate, the yellow LED lights up, the normally open contact closes, and the normally closed contact opens. Because phase sequence relay 2 is installed between the underground electrical equipment and the external power supply, the correctness of the phase sequence can be effectively monitored, thereby ensuring the normal operation and safety of the equipment. Furthermore, because the equipment is used in an underground environment (which has high requirements for the explosion-proof performance of equipment), all components are installed in the explosion-proof housing 1, which can effectively improve the explosion-proof performance of the mine explosion-proof protection device.

[0024] In this embodiment, the explosion-proof housing 1 includes an explosion-proof box 101 and an explosion-proof cover 102. The explosion-proof box 101 has a box flange at the opening edge, and the explosion-proof cover 102 has a cover flange at the edge. The box flange and the cover flange have multiple corresponding flange connection holes. The flange connection holes on the box flange and the cover flange are connected by flange bolts, thereby realizing a detachable connection between the explosion-proof box 101 and the explosion-proof cover 102.

[0025] The outer wall of the explosion-proof enclosure 101 is also provided with lifting rings 9, which can facilitate the hoisting of the explosion-proof enclosure 1, thereby making it easier to move the explosion-proof enclosure 101.

[0026] In this embodiment, the explosion-proof enclosure 101 has a cylindrical structure, while the corresponding explosion-proof cover 102 has a circular structure. This shape saves space, making the overall equipment more compact and widely applicable to various environments and locations underground.

[0027] In this embodiment, as Figure 2 As shown, a relay slide rail 3 is provided inside the explosion-proof housing 1. The relay slide rail 3 is fixed inside the explosion-proof enclosure 101 by screws. The phase sequence relay 2 is provided with a relay slider that matches the relay slide rail 3, so that the phase sequence relay 2 is slidably connected to the relay slide rail 3. The relay slide rail 3 is provided with two limiting bolts. The two limiting bolts (in the length direction of the relay slide rail 3) are located on both sides of the phase sequence relay 2, and the two limiting bolts abut against both sides of the phase sequence relay 2, thereby limiting the phase sequence relay 2.

[0028] In practical use, the relative position of the phase sequence relay 2 within the explosion-proof enclosure 1 can be effectively adjusted through the sliding cooperation between the relay slide rail 3 and the relay slider, and limited by two limiting bolts. This design offers two advantages: firstly, it facilitates disassembly and assembly; secondly, it effectively adjusts the distance between the phase sequence relay 2 and the transformer, and between the phase sequence relay 2 and the inner wall of the explosion-proof enclosure 101, thereby adjusting electrical clearances and creepage distances, and ultimately improving explosion-proof performance.

[0029] In this embodiment, the transformer is equipped with a terminal block 4, through which the transformer is electrically connected to an external power source. The terminal block 4 adopts an existing guide rail type terminal block (also known as a sliding rail type terminal block), which is characterized by the ability of the terminals to move on the terminal block and then be fixed by screws. This is a mature existing device, so its structure will not be described in detail here. Its purpose is to allow the terminals on the terminal block 4 to move relative to the transformer, thereby adjusting the distance between the terminals and the inner wall of the explosion-proof enclosure 101, thus adjusting the electrical clearance and creepage distance, thereby improving the explosion-proof performance.

[0030] In this embodiment, the inner wall of the explosion-proof housing 1 is provided with an internal grounding device 5, and the outer wall of the explosion-proof housing 1 is provided with an external grounding device 6 and a cable connection device 7. The internal grounding device 5 and the external grounding device 6 can both be existing terminals used to connect the grounding wire. Two cable connection devices 7 are provided, both being existing cable entry devices, used to connect the components to external power sources and underground electrical equipment respectively.

[0031] Example 2 like Figures 3-4 As shown, this embodiment provides a method for manufacturing a mine explosion-proof protection device, used to manufacture the mine explosion-proof protection device disclosed in Embodiment 1, including the following steps: S1. Process the explosion-proof housing 1 and prepare the components. That is, manufacture the explosion-proof housing 1 on the one hand and prepare the required components on the other hand. The two are carried out simultaneously to improve manufacturing efficiency.

[0032] S2. Assemble the explosion-proof housing 1 with the components. Specifically, first assemble the various parts of the manufactured explosion-proof housing 1, then install the components inside the explosion-proof housing 1, and complete the wiring.

[0033] S3. Electrical testing: Electrical testing can effectively detect the performance of explosion-proof protection devices used in mines.

[0034] S4. Equipment marking, namely, installing relevant warning signs and nameplates 8 on the explosion-proof cover 102.

[0035] S5. Packaging: Pack the qualified products together to facilitate later sales.

[0036] S6. Warehousing refers to the temporary storage of qualified goods awaiting sale in a warehouse, ready for later sale.

[0037] In this embodiment, the processing of the explosion-proof housing 1 in step S1 includes the following steps: S101, Blanking: Place a suitable sheet material (including but not limited to stainless steel) on a machine tool, and then use a CNC machine tool to machine it to produce the various parts of the explosion-proof housing 1.

[0038] S102, Resistance welding (i.e., resistance welding): Resistance welding is used to weld the various parts of the explosion-proof housing 1 together. After resistance welding, manual inspection is performed. If the resistance welding is unqualified, it is treated as a defective product and scrapped.

[0039] S103, Aging treatment, specifically, vibration aging treatment of the explosion-proof housing 1 after resist welding. Vibration aging treatment is a commonly used method for eliminating residual internal stress in engineering materials. It is achieved by vibration, causing the vector sum of residual internal stress and additional vibration stress in the workpiece to exceed the yield strength of the material, thus causing slight plastic deformation of the material and relaxing and reducing the internal stress.

[0040] S104. Processing of the flameproof surface, where the flameproof surface includes the contact surface between the box flange and the cover flange. The processing of the flameproof surface is a key point in manufacturing the flameproof housing 1. The processing of the flameproof surface includes machining and surface treatment of the flameproof surface. Machining of the flameproof surface is to use a numerically controlled machine tool to adjust the flatness and roughness (i.e., the flameproof parameters) of the flameproof surface, ensuring that the flameproof parameters meet the requirements of the design drawing and are within the tolerance range (for the specific values of the flameproof parameters, the requirements for the flameproof parameters of the flameproof housing 1 with different sizes and different usage requirements are different, so the specific values are not illustrated here). The surface treatment of the flameproof surface is phosphating treatment. The phosphating treatment is preferably a cold phosphating process. After phosphating, a phosphating film is formed on the surface layer of the flameproof surface, which can improve the corrosion resistance and mechanical properties of the flameproof surface, so as to ensure that the flameproof surface gap meets the standard.

[0041] S105. Conduct a hydrostatic test and inspection of the flameproof surface. Among them, the hydrostatic test is to conduct a 1MPa hydrostatic test after the processing of the flameproof surface, lasting for 1 minute. The test result is that there is no continuous dripping (at an interval of 10s). After the test, the flameproof enclosure has no obvious deformation and there is no leakage or rupture at the welded joints, which is qualified. After the hydrostatic test, the flameproof surface is manually inspected. If the hydrostatic test and the inspection of the flameproof surface are unqualified, it is processed as a defective product, that is, repaired or scrapped.

[0042] S106. Painting. The spraying process includes applying 204-1 antirust oil to all flameproof surfaces, spraying 138 iron red alcohol primer on the inner and outer surfaces (except for the flameproof surface and the inner hole), then applying 1321 arc-resistant paint on the inner surface, and applying phthalocyanine medium blue paint on the outer surface.

[0043] In this embodiment, the preparation of the components in step S1 includes the following steps: S107. Procurement of components, that is, purchasing the required components from the market.

[0044] S108. Inspection of components, that is, manually conducting the acceptance work on each component.

[0045] S109. Power-on inspection of components. Conduct a power-on test on the components to ensure that the components can work normally.

[0046] S110. The qualified products after the power-on inspection are stored in the warehouse, waiting for the subsequent assembly work of the components and the flameproof housing 1.

[0047] In this embodiment, the electrical tests in step S3 include the following steps: S301. Conduct a power frequency withstand voltage test and an insulation resistance test on the device. The power frequency withstand voltage test and the insulation resistance test are both existing tests, so the specific test process is not described in detail here. If the test is unqualified, it is processed as a defective product, that is, repaired or scrapped.

[0048] S302. Perform a power-on test, which involves energizing the entire device and testing whether the equipment can operate normally. If the test fails, it should be treated as a defective product, i.e., repaired or scrapped.

[0049] S303. Conduct actual operation testing, that is, periodically run the equipment under its actual installation conditions to check its actual performance. If the test fails, it shall be treated as a defective product, that is, repaired or scrapped.

[0050] S304. Conduct aging tests to ensure the stability and safety of the equipment in actual use.

[0051] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0052] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0054] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0055] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0056] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0057] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0058] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0059] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A mine explosion-proof protection device, characterized in that: It includes an explosion-proof housing (1), which contains components including a transformer and a phase sequence relay (2). The input end of the transformer is electrically connected to an external power source, and the output end of the transformer is electrically connected to the input end of the phase sequence relay (2). The output end of the phase sequence relay (2) can be electrically connected to underground electrical equipment.

2. The explosion-proof protective device for mining as described in claim 1, characterized in that: The explosion-proof enclosure (1) includes an explosion-proof box (101) and an explosion-proof cover (102). The explosion-proof box (101) is provided with a box flange, and the explosion-proof cover (102) is provided with a cover flange. The box flange and the cover flange are connected by flange bolts.

3. The explosion-proof protective device for mining as described in claim 2, characterized in that: The explosion-proof enclosure (101) has a cylindrical structure, and the explosion-proof cover (102) has a circular structure.

4. The explosion-proof protective device for mining as described in claim 1, characterized in that: The explosion-proof housing (1) is provided with a relay slide rail (3), and the phase sequence relay (2) is slidably connected to the relay slide rail (3). The relay slide rail (3) is provided with a limiting bolt, which can abut against the phase sequence relay (2).

5. The explosion-proof protection device for mining as described in claim 1, characterized in that: The transformer is provided with a terminal block (4), and the terminals on the terminal block (4) are movable relative to the transformer.

6. The explosion-proof protection device for mining as described in claim 1, characterized in that: The inner wall of the explosion-proof housing (1) is provided with an internal grounding device (5), and the outer wall of the explosion-proof housing (1) is provided with an external grounding device (6) and a cable connection device (7).

7. A method for manufacturing a mine explosion-proof protection device, characterized in that, The method for manufacturing the mine explosion-proof protective device according to any one of claims 1-6 includes the following steps: S1. Process the explosion-proof enclosure (1) and prepare the components; S2. Assemble the explosion-proof enclosure (1) with the components; S3, Electrical Testing; S4, Equipment Identification; S5. Packaging; S6, Warehousing.

8. The method for manufacturing the explosion-proof protective device for mining according to claim 7, characterized in that, The processing of the explosion-proof enclosure (1) in step S1 includes the following steps: S101, blanking and machining; S102, solder resist; S103, Time-sensitive processing; S104, flameproof surface processing; S105. Conduct a hydrostatic test and inspect the explosion-proof surface; S106, Spray painting.

9. The method for manufacturing the explosion-proof protective device for mining according to claim 7, characterized in that, The preparation of components in step S1 includes the following steps: S107, Procurement of Components; S108. Acceptance of components; S109. Power-on test of components; S110. Qualified products after power-on inspection are put into storage.

10. The method for manufacturing the explosion-proof protective device for mining according to claim 7, characterized in that, The electrical test in step S3 includes the following steps: S301. Perform power frequency withstand voltage test and insulation resistance test; S302. Perform a power-on test; S303. Conduct actual use and operation testing; S304. Conduct aging tests.

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