Traction gearbox and its air-permeable dust protection

Abstract

The utility model discloses a traction transmission case and breathable dustproof device thereof belong to coal winning machine technical field, and breathable dustproof device includes the first air -permeable groove of setting up in the box top, the second air -permeable groove of setting up in the first air -permeable groove center, the ring groove of setting up in the second air -permeable groove peripheral surface bottom, the drain hole of intercommunication in the ring groove, the cover plate of setting up in the first air -permeable groove, the oil injection hole of being set through in the box top and being located the cover plate below, set up in the air -permeable plug of oil injection hole, set through the air -exchange pipe of the box bottom, and the device realizes the air pressure balance in the box outside through air -permeable plug and air -exchange pipe cooperation, and sealing washer, sealing ring and air -permeable plug jointly block outside impurity, and through ring groove, drain hole and air -exchange pipe cooperation and discharge condensate, through opening the cover plate and taking out air -permeable plug, and oil injection hole can be directly used for filling lubricating oil, and need not additional operation separately and fill oil interface, and simplify the operation process.

Description

Technical Field

[0001] This utility model belongs to the field of coal mining machine technology, and in particular 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. Utility Model Content

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

[0007] In one aspect of this utility model, a ventilation and dustproof device for a traction drive box is provided. The ventilation and dustproof device is disposed on the traction drive box body and includes a first ventilation groove formed at the top of the box body, a second ventilation groove formed at the center of the first ventilation groove, an annular groove formed at the bottom of the circumference of the second ventilation groove, a drain hole communicating with the annular groove, a cover plate disposed within the first ventilation 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 this utility model, a traction transmission box is also provided, the traction transmission box including the above-mentioned ventilation and dustproof device.

[0013] The traction transmission box and its ventilation and dustproof device of this utility model have the following advantages and positive effects: (1) This device sets the ventilation and dust prevention device on the top of the box, which is the highest position of the coal mining machine. When the coal mining machine is in the overhead 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 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) This device 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 work together to 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 used directly to add lubricating oil. No additional operation is required for the 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 sealing ring, it effectively prevents coal dust and water vapor from entering from the assembly gap, and ensures 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 this utility model 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 in the following description are only for further understanding of the embodiments of this utility model and constitute a part of this utility model. 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 this utility model; Figure 2 This is a schematic diagram of the annular groove in the ventilation and dustproof device of the traction transmission box of this utility model; Figure 3 This is a schematic diagram of the working state of the ventilation and dustproof device of the traction transmission box of this utility model. 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 utility model clearer, the technical solutions of this utility model 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 utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0017] This utility model provides a traction transmission 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] As a specific embodiment, in the ventilated dustproof device of the traction transmission box of this utility model, 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 the sealing is achieved by the pressing force of the cover plate 5, preventing external impurities from entering from 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 this utility model, 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 and dustproof device of the traction transmission box of this utility model, 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] As one specific implementation, in the ventilation and dustproof device of the traction transmission box of this utility model, the fastener 9 is a fastening bolt. The fastener 9 passes 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 for the traction transmission box of this utility model 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 this utility model have the following advantages and positive effects: (1) The ventilation and dust prevention device is set at the top of the box 100, which is the highest position of the coal mining machine. When the coal mining machine is in the overhead 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 installed at 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 staff to enter the dangerous area on the coal wall side. One 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) This device achieves pressure balance between the inside and outside of the box by using the vent plug 7 and the air exchange pipe 8. The sealing gasket 54, sealing ring 55 and vent plug 7 work together to block external impurities. The condensate is discharged by using the ring groove 3, drain hole 4 and 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, it effectively prevents coal dust and water vapor 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 utility model according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, 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 state shown in the accompanying drawings.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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. Such 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 this utility model.

Claims

1. A ventilated and dustproof device for a traction drive box, wherein the ventilated and dustproof device is disposed in the traction drive box body, characterized in that, The ventilation and dustproof device includes a first ventilation groove on the top of the housing, a second ventilation groove at the center of the first ventilation groove, an annular groove at the bottom of the circumference of the second ventilation groove, a drain hole communicating with the annular groove, a cover plate disposed in the first ventilation groove, an oil injection hole penetrating the top of the housing and located below the cover plate, a vent plug disposed in the oil injection hole, and a ventilation pipe penetrating the bottom of the housing, 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.

2. The ventilated and dustproof device for the traction transmission box according to claim 1, characterized in that, A sealing gasket is provided between the first sealing section and the bottom of the first venting groove.

3. The ventilated and dustproof device for the traction transmission box according to claim 1, characterized in that, The second sealing section has a sealing groove on its outer periphery, and a sealing ring is provided in the sealing groove, with the sealing ring abutting against the inner wall of the second venting groove.

4. The ventilated and dustproof device for the traction transmission box according to claim 1, characterized in that, A gasket is provided between the fastener and the mounting hole.

5. The ventilated and dustproof device for the traction transmission box according to claim 1, characterized in that, The fasteners are fastening bolts.

6. A traction transmission box, characterized in that, The traction drive box includes the breathable and dustproof device as described in any one of claims 1-5.

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