Medium-voltage traction electric cabinet of thin seam mining machine
By using a medium-voltage frequency converter and a water channel plate made of 7075 aviation aluminum in the thin coal seam mining machine, the problems of low coal loading efficiency and insufficient heat dissipation of the electrical control box when the thin coal seam mining machine is running at extremely low mining height are solved, achieving more efficient heat dissipation and equipment stability, and avoiding water leakage accidents.
Patent Information
- Application Number
- CN202510970561.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-15
- Publication Date
- 2025-11-07
AI Technical Summary
When thin coal seam mining machines operate at extremely low mining heights, they experience low coal loading efficiency, limited coal passage space, and easy coal blockage at the bottom of the machine body, leading to increased traction resistance. The electrical control box also suffers from insufficient heat dissipation, making it prone to cracking and water leakage, which affects equipment performance and safety.
It adopts medium-voltage frequency converter traction and uses water channel plate made of 7075 aviation aluminum as heat dissipation plate. The internal water channel is set and connected to the frequency converter cavity through water inlet and outlet interfaces to ensure heat dissipation effect and structural stability, and avoid water leakage accidents.
Significantly reduces thermal resistance, improves heat dissipation, prevents water leakage from the electrical control box due to shell cracking, enhances equipment operation stability and safety, and reduces the risk of long-term high-load operation of the equipment.
Smart Images
Figure CN120916367A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of coal mining equipment, in particular to a medium-voltage traction electric control box of a thin seam coal mining machine. BACKGROUND
[0002] As one of the key ways for efficient development of current coal resources, thin seam mining is facing a series of technical bottlenecks to be broken through. In the thin seam operation scene, the coal mining machine needs to run at a very low mining height, and its core difficulties are mainly embodied in low coal loading efficiency, limited coal passing space and serious coal blocking problem at the bottom of the machine body, which directly leads to significant increase of traction resistance, forcing the equipment to be in a long-term high-load operation state, posing a serious challenge to the overall performance of the machine.
[0003] With the iteration of technology, the total power and traction power of the thin seam coal mining machine continue to rise. The total power of the current mainstream machine type has broken through 1000kW, and the peak traction power reaches 110kW and still has a growth trend. However, as a core component, the heat dissipation performance of the frequency converter has become a key factor restricting the breakthrough of power density. At the same time, the existing electric control box heat dissipation plate adopts pre-welding processing technology, which makes it difficult to achieve the design standard of flatness and perpendicularity, further weakening the heat dissipation efficiency of the frequency converter. In addition, due to the increasing traction power and faster traction speed of the thin seam coal mining machine, the vibration of the thin seam coal mining machine is very large, and the electric control box is prone to cracking, causing the electric control box to leak water and causing serious quality accidents. SUMMARY
[0004] The purpose of the present application is to provide a medium-voltage traction electric control box of a thin seam coal mining machine to solve the problems existing in the prior art.
[0005] To achieve the above purpose, the present application provides a medium-voltage traction electric control box of a thin seam coal mining machine, which comprises an electric control box body, the inside of the electric control box body is divided into a first chamber and a second chamber arranged in sequence along the vertical direction by a partition plate, the first chamber is a wiring chamber, the inside of the second chamber is divided into a frequency converter chamber, a high-voltage chamber and a computer chamber arranged in sequence along the horizontal direction by a partition plate; a waterway plate is installed on the bottom plate of the frequency converter chamber, a medium-voltage frequency converter and an input reactor are installed above the waterway plate, a waterway is arranged inside the waterway plate, and the waterway is in communication with the outside of the frequency converter chamber.
[0006] Optionally, the front end of the waterway plate is fixed on the bottom plate of the frequency converter chamber by screws, the rear end of the waterway plate is provided with a wedge mounting port, and the rear end of the waterway plate is limited by installing a wedge in the wedge mounting port.
[0007] Optionally, the waterway plate is a machined part made of 7075 aerospace aluminum material.
[0008] Optionally, the rear end of the water channel plate is provided with two convex shafts, the outer edge of the convex shaft is an explosion-proof surface, two through holes are formed in the rear plate of the frequency converter cavity, the through holes are in corresponding positions with the convex shafts, and the convex shafts pass through the through holes to form a hole shaft explosion-proof joint surface.
[0009] Optionally, the inner side of each of the two convex shafts is respectively provided with a water inlet interface and a water outlet interface, and the water channel is in communication with the water inlet interface and the water outlet interface.
[0010] Optionally, the water inlet interface and the water outlet interface are both mine KJ quick connectors.
[0011] Optionally, the high-voltage cavity is internally provided with a disconnector and a contactor.
[0012] Optionally, the computer cavity is internally provided with a control element and a power supply assembly.
[0013] The technical effect of the present application is:
[0014] The medium-voltage traction electric control box of the thin seam coal mining machine provided by the present application adopts a medium-voltage frequency converter for traction, and no longer needs a traction transformer. Since the electric control box does not have a traction transformer, the length is reduced by 15%. The heat dissipation plate of the present application is a water channel plate, which can significantly reduce the thermal resistance and improve the heat dissipation effect, and the steel plate of the electric control box does not contain any water channel, so that serious quality accidents caused by shell cracking and water leakage are avoided. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0016] The drawings that form part of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:
[0017] Fig. 1 The drawings that form part of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:
[0018] Fig. 2 The drawings that form part of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:
[0019] Label explanation: 1, electric control box; 2, frequency converter assembly; 3, wedge block; 4, wedge block mounting port; 5, hole shaft explosion-proof joint surface; 6, water inlet; 7, water outlet; 8, water channel; 9, frequency converter cavity; 10, high-voltage cavity; 11, computer cavity; 12, wiring cavity. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.
[0021] In order to facilitate the understanding of the present application, the present application will be described more fully below in conjunction with the relevant drawings, and several embodiments of the present application are given. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.
[0022] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be an intervening element between the two elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element between the two elements. The terms "vertical", "horizontal", "left", "right", and similar terms as used herein are for the purpose of illustration only;
[0023] As used herein, the terms "comprise", "comprising", "include", "including", "have", "has", and the like are open-ended terms, i.e., they mean "including but not limited to".
[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.
[0026] As Figs. 1-2As shown, the medium-voltage traction electric control box in the thin coal seam mining machine provided in the embodiment includes an electric control box body, the inside of the electric control box body is divided into a first chamber and a second chamber arranged in sequence in the vertical direction by a partition plate, the first chamber is a wiring chamber 12, the inside of the second chamber is divided into a frequency converter chamber 9, a high-voltage chamber 10 and a computer chamber 11 arranged in sequence in the horizontal direction by a partition plate; a water channel plate is installed on the bottom plate of the frequency converter chamber 9, a medium-voltage frequency converter and an input reactor are installed above the water channel plate, a water channel 8 is arranged in the water channel plate, and the water channel 8 is in communication with the outside of the frequency converter chamber 9.
[0027] The input voltage of the electric control box 1 provided in the embodiment is 1140V, 1140V medium-voltage frequency converters are used for traction, the heat dissipation plate of the electric control box 1 is a machined part made of 7075 aviation aluminum, the heat dissipation plate is installed in the electric control box 1 by screws, the heat dissipation plate extends two shafts to form an explosion-proof joint surface with two holes in the back plate of the electric control box 1. Two 1140V medium-voltage frequency converters and two input reactors are installed on the heat dissipation plate. There are threaded holes in the shafts of the heat dissipation plate for connecting water inlet and outlet joints. Water flows in the heat dissipation plate to take away heat. The steel plate of the electric control box 1 in the embodiment does not contain any water channel 8, so that serious quality accidents caused by shell cracking and water leakage are avoided.
[0028] The specific structure of the embodiment includes:
[0029] The electric control box 1 is a mine explosion-proof and intrinsically safe electric control box, the input voltage of which is 1140V, the output voltages of the traction motor, the cutting motor and the pump motor are all 1140V; the electric control box 1 has four chambers, the frequency converter chamber 9 is installed with a frequency converter assembly 2, the high-voltage chamber 10 is installed with disconnectors and contactors, and the computer chamber 11 is installed with control elements and power supply assemblies.
[0030] The frequency converter assembly 2 is installed on the bottom plate of the frequency converter chamber 9, and the frequency converter assembly 2 includes two 1140V four-phase frequency converters, two 1140V input reactors, one water channel plate and two wedge blocks 3; the front end of the water channel plate is fixed on the bottom plate by screws, the water channel plate has a groove for installing the wedge blocks 3, the wedge blocks 3 are used to fix the frequency converter assembly 2, the rear end of the water channel plate is clamped by the wedge blocks 3, the frequency converter assembly 2 is completely limited, and the water outlet 7 and the water inlet 6 on the water channel plate are both mine KJ quick connectors. The water channel plate has two protruding shafts, the outer edge of the protruding shafts is an explosion-proof surface; the inner side of the shafts is internally threaded for installing the KJ mine quick connectors, two through holes are formed in the back plate of the electric control box 1, the positions of the through holes correspond to the protruding shafts, and the through holes form an explosion-proof joint surface with the protruding shafts of the water channel plate.
[0031] The water channel plate is filled with water channel 8, and the heat generated by the frequency converter and the reactor can be quickly taken away by water; at the same time, the described water channel plate can withstand a water pressure test of 6MPa for 30 minutes, and there is no leakage during the water pressure test, and the flatness of the surface of the water channel plate remains unchanged after the test, meeting the design requirements, having a very high water pressure bearing capacity, and not reducing the heat dissipation performance due to deformation and cracking of the water channel plate.
[0032] In summary, in the embodiment, since a 1140V medium voltage frequency converter is used for traction, a traction transformer is no longer needed, and since the electric control box 1 does not have a traction transformer, the length is reduced by 15%. The heat dissipation plate is a water channel plate made of 7075 aviation aluminum, and the thermal conductivity of 7075 aluminum is 5 times that of steel, and the mechanical strength is equivalent to that of Q195 steel, so the material heat dissipation performance is greatly improved. At the same time, the water channel plate is a machined part, unlike the heat dissipation plate processed before welding, the surface roughness and flatness of the machined heat dissipation plate are completely controllable, which can significantly reduce the thermal resistance and improve the heat dissipation effect.
[0033] In the embodiment, since the heat dissipation plate joint is outside the electric control box 1, the electric control box 1 itself does not have any cooling water channel, and there is no electric control box 1 water leakage accident caused by poor joint sealing. At the same time, the water channel 8 of the heat dissipation plate needs to be subjected to high-pressure water pressure test before and after welding, which can ensure that the heat dissipation plate will not leak.
[0034] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A medium voltage traction control box for a thin seam coal mining machine, characterized in that, The electric control box is internally divided into a first chamber and a second chamber by a partition plate, the first chamber is a wiring chamber (12), the second chamber is internally divided into a frequency converter chamber (9), a high-voltage chamber (10) and a computer chamber (11) by a partition plate.
2. The electric control box according to claim 1, characterized in that, The front end of the water channel plate is fixed on the bottom plate of the frequency converter chamber (9) by screws, and the rear end of the water channel plate is provided with a wedge mounting port (4).
3. The electric control box according to claim 2, wherein The water channel plate is a machining part made of 7075 aviation aluminum material.
4. The electric control box according to claim 1, wherein The rear end of the water channel plate is provided with two convex shafts, the outer edge of the convex shafts is an explosion-proof surface, two through holes are formed in the rear plate of the frequency converter chamber (9), the positions of the through holes correspond to the convex shafts, and the convex shafts pass through the through holes to form a hole shaft explosion-proof joint surface (5).
5. The electric control box according to claim 4, wherein The inner sides of the two convex shafts are respectively provided with water inlet interfaces and water outlet interfaces, and the water channel (8) is in communication with the water inlet interfaces and the water outlet interfaces.
6. The electric control box according to claim 5, wherein The water inlet interfaces and the water outlet interfaces are mine KJ quick connectors.
7. The electric control box according to claim 1, wherein The high-voltage chamber (10) is internally provided with a disconnecting switch and a contactor.
8. The electric control box according to claim 1, wherein The computer chamber (11) is internally provided with a control element and a power supply assembly.