Traction transmission case and breathable dustproof device thereof

Abstract

The invention discloses a traction transmission case and a breathable dustproof device thereof, and belongs to the technical field of coal mining machines. The ventilation dustproof device comprises a first ventilation groove formed in the top of the box body, a second ventilation groove formed in the center of the first ventilation groove, an annular groove formed in the bottom of the circumferential face of the second ventilation groove, a drainage hole communicating with the annular groove and a cover plate arranged in the first ventilation groove. The oil injection hole is formed in the top of the box body in a penetrating mode and located below the cover plate, the vent plug is arranged in the oil injection hole, and the ventilation pipe is arranged at the bottom of the box body in a penetrating mode. Air pressure balance inside and outside the box is achieved through cooperation of the vent plug and the ventilation pipe, the sealing gasket, the sealing ring and the vent plug jointly block external impurities, condensate water is discharged through cooperation of the annular groove, the drainage hole and the ventilation pipe, and after the cover plate is opened and the vent plug is taken out, the oil injection hole can be directly used for injecting lubricating oil without additional operation of an independent oil adding connector. The operation process is simplified.

Description

Technical Field

[0001] This invention belongs to the field of coal mining machine technology, and particularly relates to a traction transmission box and its ventilation and dust prevention device. Background Technology

[0002] Coal is a crucial component of my country's energy system. As the core equipment in underground fully mechanized mining faces, the operational stability of the coal mining machine directly determines the efficiency and safety of coal mining operations. The traction drivebox, a key power transmission component of the coal mining machine, generates heat due to friction during high-speed operation of its internal gears, bearings, and other components, leading to increased internal temperature and pressure. If the internal and external pressures cannot be balanced in time, it will compromise the box's sealing performance, causing lubricating oil leakage and even damage to the seals. This, in turn, affects the normal operation of the gear transmission mechanism and shortens the equipment's service life.

[0003] Therefore, the traction drive box needs to be equipped with a venting device to achieve pressure balance and ensure stable operation of the equipment. At the same time, the underground environment of coal mines is harsh, with a large amount of coal dust, rock powder and humid water vapor in the air. If the venting device lacks effective filtration capabilities, these impurities will enter the box and mix with the lubricating oil, aggravating component wear and increasing the risk of transmission failure. Therefore, the venting device also needs to have a reliable impurity blocking function to meet the protection requirements of the traction drive box under the complex working conditions underground.

[0004] Currently, the ventilation devices of coal mining machines are generally located inside the coal wall side box of the high-speed gearbox of the traction box. Although this position is relatively high and attempts to reduce lubricating oil leakage, there are obvious drawbacks in actual application: when the coal mining machine is in the overhead mining state, the high-speed rotation of the gears inside the box causes lubricating oil to splash, and some lubricating oil will still overflow from the ventilation device, causing oil waste and environmental pollution. It may also affect the lubrication effect due to the drop in oil level. Moreover, the ventilation device is located on the coal wall side, and there are safety hazards such as coal falling and wall spalling on the underground coal wall side. When the staff disassembles and replaces the device, they have to operate in the dangerous area, which not only increases the safety risk of operation, but also prolongs the maintenance time and reduces the operating efficiency of the coal mining machine.

[0005] Furthermore, existing ventilation devices only have ventilation functions and cannot be used as traction gearbox refueling ports. Refueling must be done through a separate interface, which is cumbersome. At the same time, their filter structure design is insufficient and cannot effectively prevent downhole impurities from entering the gearbox. They cannot meet the comprehensive usage requirements of traction gearboxes for ventilation, impurity prevention, and convenient refueling. Therefore, there is an urgent need to improve the structure of the ventilation device. In summary, there is an urgent need for a traction gearbox and its ventilation and dust prevention device. Summary of the Invention

[0006] To address some or all of the technical problems existing in the prior art, the present invention provides a traction transmission box and its ventilation and dustproof device.

[0007] In one aspect of the present invention, a ventilated dustproof device for a traction drive box is provided. The ventilated dustproof device is disposed on the traction drive box body and includes a first ventilated groove formed at the top of the box body, a second ventilated groove formed at the center of the first ventilated groove, an annular groove formed at the bottom of the circumference of the second ventilated groove, a drain hole communicating with the annular groove, a cover plate disposed within the first ventilated groove, an oil injection hole penetrating the top of the box body and located below the cover plate, a vent plug disposed within the oil injection hole, and a ventilation pipe penetrating the bottom of the box body, wherein: The cover plate includes a first sealing section and a second sealing section connected to each other. The second sealing section has a hollow cavity with a receiving chamber. The vent plug is disposed in the receiving chamber. The first sealing section is embedded in the first vent groove. The second sealing section is embedded in the second vent groove. The receiving chamber is connected to the annular groove. The drain hole is connected to the ventilation pipe through an external traction gap. The first sealing section has an installation hole at its top and the first vent groove has a fixing hole at its bottom. The installation hole and the fixing hole are connected by fasteners.

[0008] Furthermore, in the above-mentioned ventilated dustproof device for the traction transmission box, a sealing gasket is provided between the first sealing section and the bottom of the first ventilated groove.

[0009] Furthermore, in the above-mentioned ventilated dustproof device for the traction transmission box, a sealing groove is provided on the outer periphery of the second sealing section, and a sealing ring is provided in the sealing groove, with the sealing ring abutting against the inner wall of the second ventilated groove.

[0010] Furthermore, in the above-mentioned ventilated dustproof device for the traction transmission box, a gasket is provided between the fastener and the mounting hole.

[0011] Furthermore, in the aforementioned ventilated dustproof device for the traction transmission box, the fasteners are fastening bolts.

[0012] In another aspect of the invention, a traction drive box is also provided, the traction drive box including the above-described ventilated and dustproof device.

[0013] The traction drive box and its ventilation and dustproof device of the present invention have the following advantages and positive effects: (1) The present invention sets the ventilation and dust prevention device on the top of the box, which is at the highest position of the coal mining machine. When the coal mining machine is in the upward mining state, the height of the lubricating oil splashed by the gear rotation in the box is lower than the position of the ventilation plug and the oil injection hole, which effectively prevents the lubricating oil from overflowing from the ventilation device, reduces oil waste and environmental pollution, and ensures the stability of the oil level in the box. Moreover, since the ventilation plug is installed on the top of the box through the cover plate, the maintenance operation can be completed on the goaf side. There is no need for the staff to enter the dangerous area on the coal wall side. A single person can replace the ventilation plug by disassembling the fasteners and opening the cover plate, which greatly shortens the maintenance time and improves the safety and efficiency of the operation. (2) The present invention achieves pressure balance inside and outside the box by using a vent plug and a ventilation pipe. The sealing gasket, sealing ring and vent plug together block external impurities. Condensate is discharged by using a ring groove, drainage hole and ventilation pipe. After opening the cover and taking out the vent plug, the oil filling hole can be directly used to add lubricating oil without additional operation of a separate oil filling interface, which simplifies the operation process. By the fitting of the first sealing section and the first vent groove, and the fitting of the second sealing section and the second vent groove, combined with the double sealing structure of the sealing gasket and the sealing ring, the underground coal dust and water vapor are effectively prevented from entering through the assembly gap, ensuring the lubrication environment of components such as gears and bearings. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the ventilation and dustproof device for the traction transmission box of the present invention; Figure 2 This is a schematic diagram of the annular groove in the ventilation and dustproof device of the traction transmission box of the present invention; Figure 3 This is a schematic diagram of the working state of the ventilation and dustproof device for the traction transmission box of the present invention. Figure 4 yes Figure 3 A magnified view of part A in the image.

[0015] Explanation of reference numerals in the attached figures: 1. First venting groove; 2. Second venting groove; 3. Ring groove; 4. Drain hole; 5. Cover plate; 51. First sealing section; 52. Second sealing section; 53. Receiving chamber; 54. Sealing gasket; 55. Sealing ring; 6. Oil injection hole; 7. Vent plug; 8. Air exchange pipe; 9. Fasteners; 100. Box body. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0017] This invention provides a traction drive box and its ventilation and dustproof device, such as Figures 1 to 4 As shown, the ventilated dustproof device of the traction transmission box is located in the traction transmission box body 100. The ventilated dustproof device includes a first ventilated groove 1 opened at the top of the body 100, a second ventilated groove 2 opened at the center of the first ventilated groove 1, an annular groove 3 opened at the bottom of the circumference of the second ventilated groove 2, a drain hole 4 communicating with the annular groove 3, a cover plate 5 set in the first ventilated groove 1, an oil injection hole 6 penetrating the top of the body 100 and located below the cover plate 5, a vent plug 7 set in the oil injection hole 6, a ventilation pipe 8 penetrating the bottom of the body 100, and a drain hole. 4 is used to guide liquid discharge; 7 is used to filter gas and block impurities; one end of the drain hole 4 is connected to the annular groove 3, and the other end extends into the side wall of the housing 100, connecting with the preset external traction gap (not shown in the figure); one end of the ventilation pipe 8 is connected to the external atmosphere of the housing 100, and the other end extends upward into the interior of the housing 100, connecting with the bottom end of the external traction gap, forming a liquid and gas channel from the annular groove 3 to the atmosphere; the bottom end of the oil filling hole 6 is connected to the gear transmission mechanism area inside the housing 100, used for adding lubricating oil. The cover plate 5 includes a first sealing section 51 and a second sealing section 52 connected to each other. The first sealing section 51 and the second sealing section 52 are integrally formed. The cavity size of the first vent groove 1 is adapted to the first sealing section 51 of the cover plate 5, and the cavity size of the second vent groove 2 is adapted to the second sealing section 52 of the cover plate 5. The second sealing section 52 is hollow and has a receiving chamber 53. The vent plug 7 is set in the receiving chamber 53. The first sealing section 51 is embedded in the first vent groove 1, and the second sealing section 52 is embedded in the second vent groove 2. The receiving chamber 53 is connected to the annular groove 3. The cavity of the annular groove 3 is used to collect condensate. The drain hole 4 is connected to the ventilation pipe 8 through the external traction gap. The first sealing section 51 has an installation hole at its top end and the first venting groove 1 has a fixing hole at its bottom end. The installation hole and the fixing hole are connected by a fastener 9.

[0018] In one specific embodiment, in the ventilated dustproof device of the traction transmission box of the present invention, a sealing gasket 54 is provided between the first sealing section 51 and the bottom of the first ventilated groove 1. More specifically, the sealing gasket 54 is made of elastic sealing material and is sealed by the pressing force of the cover plate 5, preventing external impurities from entering through the gap between the first sealing section 51 and the first ventilated groove 1.

[0019] In one specific embodiment, in the ventilated dustproof device of the traction transmission box of the present invention, a sealing groove is provided on the outer periphery of the second sealing section 52, and a sealing ring 55 is provided in the sealing groove. The sealing ring 55 abuts against the inner wall of the second ventilated groove 2. More specifically, the sealing ring 55 is made of an oil-resistant and wear-resistant elastic material. When the second sealing section 52 is embedded in the second ventilated groove 2, the sealing ring 55 abuts tightly against the inner wall of the second ventilated groove 2, thereby achieving a seal between the second sealing section 52 and the second ventilated groove 2.

[0020] In one specific embodiment, in the ventilated dustproof device of the traction transmission box of the present invention, a gasket is provided between the fastener 9 and the mounting hole. The gasket is used to disperse the clamping force of the fastener 9 and prevent the edge of the mounting hole from deforming.

[0021] In one specific embodiment, in the ventilation and dustproof device of the traction transmission box of the present invention, the fastener 9 is a fastening bolt, and the fastener 9 is passed through the mounting hole and the fixing hole to realize the detachable fixing of the cover plate 5 and the box body 100.

[0022] The working principle of the ventilation and dustproof device of the traction transmission box of the present invention is as follows: When the traction transmission box is working, the friction of the internal gears and bearings generates heat, causing the air pressure inside the box to rise. At this time, the high-pressure gas inside the box diffuses upward through the inner cavity of the box 100, passes through the gap of the oil injection hole 6 and the vent plug 7 in sequence, and enters the receiving chamber 53 of the cover plate 5. Then, it enters the ring groove 3 from the receiving chamber 53. The gas in the ring groove 3 flows into the outer traction gap through the drain hole 4, and is finally discharged to the outside atmosphere of the box 100 through the air exchange pipe 8, so as to achieve the balance of air pressure inside and outside the box and avoid damage to the sealing structure of the box 100 due to pressure difference. Coal dust, rock powder, and water vapor in the underground air enter the external traction gap through the ventilation pipe 8 and are blocked by the filtration effect of the vent plug 7, preventing them from entering the oil injection hole 6. At the same time, the sealing gasket 54 between the first sealing section 51 and the first vent groove 1, and the sealing ring 55 between the second sealing section 52 and the second vent groove 2 can effectively prevent external impurities from entering through the assembly gap between the cover plate 5 and the box 100. The double protection ensures that the inner cavity of the box 100 is not contaminated by impurities. During the ventilation process, water vapor in the air condenses into liquid water upon contact with the vent plug 7. The liquid water drips down the inner wall of the receiving chamber 53 into the annular groove 3. The condensate collected in the annular groove 3 flows into the drain hole 4 under the action of gravity, enters the external traction gap through the drain hole 4, and is finally discharged to the outside of the box 100 through the ventilation pipe 8. This prevents the condensate from accumulating in the box and mixing with the lubricating oil, thus ensuring the lubricating performance of the lubricating oil. When it is necessary to add lubricating oil to the traction transmission box, the operator operates on the goaf side: First, remove the fastener 9, remove the gasket, and then lift the cover plate 5 upward to expose the vent plug 7 below. Then, take out the vent plug 7 from the receiving chamber 53, add lubricating oil to the gear transmission mechanism area inside the box 100 through the oil filling hole 6. After adding the oil, insert the vent plug 7 into the oil filling hole 6, close the cover plate 5 again, and assemble and tighten the gasket and fastener 9 in sequence to complete the oil filling operation. There is no need to find or operate a separate oil filling port. When it is necessary to replace the vent plug 7, the workers do not need to enter the dangerous area on the coal wall side. The replacement can be completed only on the goaf side: follow the steps of the oil injection operation to disassemble the fastener 9, lift the cover plate 5, take out the old vent plug 7, replace the new vent plug 7, and then reassemble the cover plate 5 and fastener 9. The whole process can be completed quickly by a single person, which greatly reduces the risk of operation and shortens the maintenance time.

[0023] On the other hand, the present invention also provides a traction transmission box, which includes the above-mentioned ventilation and dustproof device.

[0024] In summary, compared with the prior art, the traction transmission box and its ventilation and dustproof device of the present invention have the following advantages and positive effects: (1) The present invention sets the ventilation and dust prevention device on the top of the box 100, which is at the highest position of the coal mining machine. When the coal mining machine is in the upward mining state, the height of the lubricating oil splashed by the gear rotation in the box is lower than the position of the ventilation plug 7 and the oil injection hole 6, which effectively prevents the lubricating oil from overflowing from the ventilation device, reduces oil waste and environmental pollution, and ensures the stability of the oil level in the box. Moreover, since the ventilation plug 7 is assembled on the top of the box 100 through the cover plate 5, the maintenance operation can be completed on the goaf side. There is no need for the staff to enter the dangerous area on the coal wall side. A single person can replace the ventilation plug 7 by disassembling the fastener 9 and opening the cover plate 5, which greatly shortens the maintenance time and improves the safety and efficiency of the operation. (2) The present invention achieves pressure balance inside and outside the box by the cooperation of the vent plug 7 and the air exchange pipe 8. The sealing gasket 54, the sealing ring 55 and the vent plug 7 jointly block external impurities. The condensate is discharged by the cooperation of the ring groove 3, the drain hole 4 and the air exchange pipe 8. After opening the cover plate 5 and taking out the vent plug 7, the oil filling hole 6 can be directly used to add lubricating oil without the need for additional operation of the separate oil filling interface, which simplifies the operation process. By the fitting of the first sealing section 51 and the first vent groove 1, and the fitting of the second sealing section 52 and the second vent groove 2, combined with the double sealing structure of the sealing gasket 54 and the sealing ring 55, the underground coal dust and water vapor are effectively prevented from entering from the assembly gap, ensuring the lubrication environment of components such as gears and bearings.

[0025] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0026] 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 foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dust-proofing device for a traction drive case, the dust-proofing device being provided to a case body of the traction drive case, characterized by, The air-permeable dustproof device comprises a first air-permeable groove opened on the top of the box, a second air-permeable groove opened in the center of the first air-permeable groove, an annular groove opened on the bottom of the circumferential surface of the second air-permeable groove, a drain hole communicated with the annular groove, a cover plate arranged in the first air-permeable groove, an oil injection hole penetratingly arranged on the top of the box and located below the cover plate, an air-permeable plug arranged in the oil injection hole, and an air exchange pipe penetratingly arranged on the bottom of the box. The cover plate comprises a first sealing section and a second sealing section connected with each other, a containing bin is hollowly arranged in the second sealing section, the air-permeable plug is arranged in the containing bin, the first sealing section is embedded in the first air-permeable groove, the second sealing section is embedded in the second air-permeable groove, the containing bin is communicated with the annular groove, and the drain hole is communicated with the air exchange pipe through an outer traction gap. A mounting hole is opened on the top end of the first sealing section, a fixing hole is opened on the bottom end of the first air-permeable groove, and the mounting hole and the fixing hole are connected through a fastener.

2. The air-permeable dust guard for a traction drive case according to claim 1, characterized in that A sealing gasket is arranged between the first sealing section and the bottom of the first air-permeable groove.

3. The dust-proof ventilation device of the traction drive case according to claim 1, characterized in that, A sealing groove is opened on the outer periphery of the second sealing section, a sealing ring is arranged in the sealing groove, and the sealing ring abuts against the inner wall of the second air-permeable groove.

4. The dust-proof ventilation device of the traction drive case according to claim 1, characterized in that, A gasket is arranged between the fastener and the mounting hole.

5. The dust-proof ventilation device of the traction drive case according to claim 1, characterized in that, The fastener is a fastening bolt.

6. A traction drive gearbox characterised in that, The traction transmission box comprises the air-permeable dustproof device according to any one of claims 1-5.

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