Long-service-life mining cutting speed reducer

Abstract

The utility model discloses a mining cutting speed reducer with long service life, which relates to the technical field of cutting speed reducers, and comprises a shell, two planetary reduction gear sets are arranged in the shell, each planetary reduction gear set comprises a fixed disc I and a fixed disc II, oil injection cavities are formed in the fixed disc I and the fixed disc II, and the fixed disc I and the fixed disc II are arranged in the shell. Oil spraying holes in a circumferential array are formed in one side of the oil spraying cavity, first oil spraying nozzles are embedded in the oil spraying holes, cooling cavities are additionally formed in the first fixing disc and the second fixing disc correspondingly, and each cooling cavity comprises an outer ring cavity, an inner ring cavity and three communicating cavities communicated with the outer ring cavity and the inner ring cavity, and the outer ring cavity and the inner ring cavity are concentrically arranged; the first fixing disc and the second fixing disc are each provided with a liquid inlet and a liquid outlet which are communicated with the outer ring cavity, a blocking piece is fixedly connected to the position, between the liquid inlet and the liquid outlet, in the outer ring cavity, the cooling cavity circulates cooling liquid through the liquid inlet and the liquid outlet, and the device has the advantage that the service life of the cutting speed reducer is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting reduction mechanism technical field, concretely is a kind of high life mining cutting reduction mechanism. BACKGROUND

[0002] Mining cutting reduction mechanism is the core power transmission component of mine machinery such as heading machine, coal winning machine, and its performance directly determines the working efficiency and reliability of equipment.In mine operation, reduction mechanism needs to bear high torque, high impact load and dust, damp and other harsh environment for a long time, and the requirement to structural strength, heat dissipation capacity and lubricating system is extremely high.

[0003] Traditional mining reduction mechanism mostly uses multistage parallel shaft gear or single planetary gear train structure, and the following problems exist:

[0004] 1, loose structure, insufficient torsional stiffness: in traditional layout, power input and output shaft are coaxial or linearly arranged, transmission chain is long, and space occupation is large, which leads to shell being easily affected by torsional deformation, gear meshing precision is reduced, and wear is accelerated.

[0005] 2, low heat dissipation efficiency: a large amount of heat is generated when gear set in closed shell runs at high speed, and only natural heat dissipation or simple air cooling is relied on, which easily leads to oil temperature rising, lubrication performance deteriorating, and wear and failure of gear and bearing being aggravated.

[0006] 3, uneven lubrication and oil pollution: traditional spray lubrication is difficult to accurately cover gear meshing surface, and metal chips mixed in lubricating oil circulation are not effectively filtered, which aggravates wear of friction pair and shortens service life of parts

[0007] 4, uneven load: unilateral power transmission easily causes gear set to be unevenly loaded, causes local stress concentration, reduces transmission stability, and even causes tooth breakage failure.

[0008] In recent years, although improved scheme attempts to improve performance by optimizing gear parameters or increasing heat dissipation holes, but it cannot systematically solve the coordination problem of structural stiffness, heat management and lubrication efficiency, so the service life of reduction mechanism is still difficult to meet the high-intensity continuous operation demand of mine, therefore, it is necessary to design a kind of mining cutting reduction mechanism for improving the service life of cutting reduction mechanism. INVENTION CONTENTS

[0009] The utility model aims at the prior art defects, provides a kind of high life mining cutting reduction mechanism to solve the problems in the above background technology.

[0010] In order to solve the above technical problems, the utility model provides technical scheme as follows: A long -life mining cutting speed reducer, including the casing, be provided with two planetary reduction gear sets in the casing, the planetary reduction gear set includes fixed disc one and fixed disc two, the fixed disc one and fixed disc two all are equipped with oil injection cavity, one side of oil injection cavity is equipped with the oil injection hole of circumferential array, is embedded with oil injection nozzle one in the oil injection hole, the fixed disc one and fixed disc two all are equipped with cooling cavity additionally, the cooling cavity includes concentric setting outer ring cavity and inner ring cavity and three communicating cavities that communicate both, the fixed disc one and fixed disc two all are equipped with liquid inlet and liquid outlet that communicate with outer ring cavity, the outer ring cavity is fixedly connected with the baffle between liquid inlet and liquid outlet, cooling liquid circulation is cooled through liquid inlet and liquid outlet of the cooling cavity.

[0011] The utility model further discloses that the horizontal cavity and longitudinal cavity are formed in the casing, the longitudinal cavity is connected perpendicularly to the center of the horizontal cavity along the axis, the horizontal cavity and longitudinal cavity are communicated and perpendicular to each other, and the two planetary reduction gear sets are symmetrically arranged in the horizontal cavity with the longitudinal cavity center line as the reference.

[0012] The utility model further discloses that three heat dissipation openings are formed in the fixed disc one and the fixed disc two, and the three heat dissipation openings are uniformly distributed in a circle with the center of the horizontal cavity as the center.

[0013] The utility model further discloses that a plurality of cooling fins are fixedly connected to the inner bottom wall and the inner top wall of the three heat dissipation openings, and the cooling fins of the inner bottom wall and the inner top wall of the heat dissipation opening are staggered.

[0014] The utility model further discloses that a plurality of cooling holes are formed in the cooling fins, and the cooling holes are arrayed.

[0015] The utility model further discloses that an oil collecting groove is formed in the inner wall of the lower side of the horizontal cavity, an oil filter opening is formed at the center position of the oil collecting groove, and a magnetic oil filter is fixedly connected in the oil filter opening.

[0016] The utility model further discloses that an oil tank and a pump body are arranged on the outside of the casing, the input end of the pump body is communicated with the oil tank through a pipeline, the output end pipeline of the pump body is communicated with an oil inlet main pipe, the oil inlet main pipe is located on the outside of the casing, a plurality of oil inlet branch pipes are communicated on the oil inlet main pipe, four oil inlet branch pipes penetrate the casing to communicate with the oil injection cavities of the two fixed disc one and the two fixed disc two in the horizontal cavity, and the magnetic oil filter is communicated to the oil tank through a pipeline.

[0017] The utility model further illustrates, the liquid inlet on fixed disc one and fixed disc two all is fixedly connected with liquid inlet branch pipe, a plurality of liquid inlet branch pipes are fixedly connected with liquid inlet main pipe for cooling liquid input in whole through the shell, the liquid outlet on fixed disc one and fixed disc two all is fixedly connected with liquid outlet branch pipe, a plurality of liquid outlet branch pipes are fixedly connected with liquid outlet main pipe for cooling liquid output in whole through the shell.

[0018] Compared with the prior art, the utility model has the advantages that: the utility model, through setting the shell and the planetary reduction gear set that is arranged in the shell symmetrically, the overall transmission length is shortened significantly, the structure is compact, the space occupation is reduced, and the torsional stiffness is improved.

[0019] By setting the oil nozzle one and cooling cavity on fixed disc one and fixed disc two, the lubrication of the planetary reduction gear set and the heat dissipation and cooling effect of the temperature in the shell are realized, so that the service life of the cutting reduction machine is improved.

[0020] By setting the oil collecting groove and the magnetic oil filter, the excess lubricating oil in the shell is filtered and recycled, the utilization rate of the lubricating oil is improved, the oil pollution in the shell is reduced, and the service life of the cutting reduction machine is improved. DRAWINGS

[0021] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation on the utility model. In the drawings:

[0022] Figure 1 It is the overall structure schematic diagram of the utility model;

[0023] Figure 2 It is the overall structure part sectional view structure schematic diagram of the utility model;

[0024] Figure 3 It is the planetary reduction gear set split structure schematic diagram of the utility model;

[0025] Figure 4 It is the shell sectional view structure schematic diagram of the utility model;

[0026] Figure 5 It is the fixed disc one part sectional view front view structure schematic diagram of the utility model;

[0027] Figure 6 It is the fixed disc one part sectional view rear view structure schematic diagram of the utility model;

[0028] In the figure: 1, the shell; 2, transverse cavity; 3, longitudinal cavity; 4, planetary reduction gear set; 5, motor; 6, bevel gear one; 7, center shaft one; 8, shaft sleeve one; 9, fixed disc one; 10, bevel gear two; 11, center gear one; 12, planetary gear one; 13, gear ring one; 14, bearing one; 15, connecting shaft one; 16, planet carrier one; 17, center shaft two; 18, shaft sleeve two; 19, fixed disc two; 20, center gear two; 21, planetary gear two; 22, gear ring two; 23, bearing two; 24, connecting shaft two; 25, planet carrier two; 26, main output shaft; 27, end cover; 28, shaft sleeve three; 29, heat dissipation opening; 30, cooling fin; 31, oil injection cavity; 32, oil injection hole; 33, oil inlet main pipe; 34, oil inlet branch pipe; 35, oil collecting groove; 36, oil filter port; 37, cooling cavity; 38, outer ring cavity; 39, inner ring cavity; 40, communication cavity; 41, liquid inlet; 42, liquid outlet; 43, baffle; 44, liquid inlet branch pipe; 45, liquid inlet main pipe; 46, liquid outlet branch pipe; 47, liquid outlet main pipe; 48, support plate. DETAILED DESCRIPTION

[0029] The utility model discloses technical scheme is further non-restrictive detailed description with preferred embodiment and its drawing. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. On the basis of the embodiment in the utility model, all other embodiments that the ordinary skilled person in the art obtains without making creative labor belong to the range of the utility model protection.

[0030] Please refer to Figures 1-6 The utility model provides technical scheme: a high life mine cutting reduction gear, including shell 1, shell 1 is " T " pipe type structure, be provided with transverse cavity 2 and longitudinal cavity 3 in shell 1, transverse cavity 2 and longitudinal cavity 3 are communicated and perpendicular to each other, longitudinal cavity 3 is vertically connected in the center along the axis of transverse cavity 2.

[0031] Two planetary reduction gear sets 4 that are symmetrical with longitudinal cavity 3 center line as reference are provided in transverse cavity 2.

[0032] Longitudinal cavity 3 is fixedly connected with motor 5, and the output end of motor 5 faces one side of transverse cavity 2, and the output shaft of motor 5 is fixedly connected with bevel gear one 6 close to one end of transverse cavity 2.

[0033] As Figure 3 Planetary reduction gear set 4 includes center shaft one 7, and shaft sleeve one 8 is sleeved at the center of center shaft one 7 along the axis direction, and center shaft one 7 is rotatably connected with shaft sleeve one 8, and shaft sleeve one 8 is sleeved with fixed disc one 9 outside, and shaft sleeve one 8 is fixedly connected with fixed disc one 9, and the outer circumferential wall of fixed disc one 9 is fixedly connected with the inner wall of transverse cavity 2.

[0034] The center shaft one 7 is coaxially and fixedly connected with a bevel gear two 10 on one side close to the bevel gear one 6, and the bevel gear one 6 is engaged with the bevel gear two 10.

[0035] The center shaft one 7 is coaxially and fixedly connected with a center gear one 11 on one side away from the bevel gear two 10, and the center gear one 11 is engaged with three planetary gears one 12 on the outer side, and the three planetary gears one 12 are evenly distributed in a circle with the center gear one 11 as the center.

[0036] The center gear one 11 is coaxially and outwardly provided with a gear ring one 13, and the inner ring wall of the gear ring one 13 is provided with a gear, and the three planetary gears one 12 are engaged with the gear of the gear ring one 13 while being engaged with the center gear one 11.

[0037] The center of the three planetary gears one 12 is sleeved with a bearing one 14, the planetary gear one 12 is fixedly connected with the outer ring of the bearing one 14, the inner ring of the bearing one 14 is sleeved with a connecting shaft one 15, the inner ring of the bearing one 14 is fixedly connected with the connecting shaft one 15, the connecting shaft one 15 is arranged on one side away from the center shaft one 7 relative to the planetary gear one 12, one end of the connecting shaft one 15 away from the planetary gear one 12 is fixedly connected with a planet carrier one 16, and one end of the center shaft one 7 away from the bevel gear two 10 is sleeved on the planet carrier one 16 and rotationally connected with the planet carrier one 16.

[0038] The center of one side of the planet carrier one 16 away from the center gear one 11 is fixedly connected with a center shaft two 17, the center shaft two 17 is sleeved with an axle sleeve two 18 on the outer side, the center shaft two 17 is rotationally connected with the axle sleeve two 18, the axle sleeve two 18 is sleeved with a fixed disc two 19 on the outer side, the axle sleeve two 18 is fixedly connected with the fixed disc two 19, and the outer wall of the fixed disc two 19 is fixedly connected with the inner wall of the transverse cavity 2.

[0039] The center shaft two 17 is coaxially and fixedly connected with a center gear two 20 on one side away from the planet carrier one 16, and the center gear two 20 is engaged with three planetary gears two 21 on the outer side, and the three planetary gears two 21 are evenly distributed in a circle with the center gear two 20 as the center.

[0040] The center gear two 20 is coaxially and outwardly provided with a gear ring two 22, and the inner ring wall of the gear ring two 22 is provided with a gear, and the three planetary gears two 21 are engaged with the gear of the gear ring two 22 while being engaged with the center gear two 20.

[0041] The center of the three planetary gears two 21 is sleeved with a bearing two 23, the planetary gears two 21 are fixedly connected with the outer ring of the bearing two 23, the inner ring of the bearing two 23 is sleeved with a connecting shaft two 24, the inner ring of the bearing two 23 is fixedly connected with the connecting shaft two 24, the connecting shaft two 24 is arranged on the side away from the center shaft two 17 relative to the planetary gears two 21, the end of the connecting shaft two 24 away from the planetary gears two 21 is fixedly connected with a planet carrier two 25, the center of the side of the planet carrier two 25 away from the center gear two 20 is fixedly connected with a main output shaft 26.

[0042] The end of the center shaft two 17 away from the planet carrier one 16 is sleeved on the planet carrier two 25 and is rotationally connected with the planet carrier two 25.

[0043] The planet carrier one 16 and the planet carrier two 25 are the same in structure, and both are "Y" shaped plate structures, having good connectivity and stability.

[0044] As Figure 2 , the transverse cavity 2 is provided with an end cover 27 at both ends, the end cover 27 is sealingly and fixedly connected with the shell 1, so as to encapsulate the transverse cavity 2, the main output shaft 26 is sleeved with a shaft sleeve three 28, the main output shaft 26 is rotationally connected with the shaft sleeve three 28, the shaft sleeve three 28 is sleeved in the center hole of the end cover 27 and is sealingly and fixedly connected with the center hole of the end cover 27, the end of the main output shaft 26 away from the planet carrier two 25 penetrates out of the end cover 27 and is fixedly connected with the cutting head of the tunneling machine.

[0045] As Figure 5 , the fixed disc one 9 and the fixed disc two 19 are the same in structure, and both are provided with three heat dissipation openings 29, the three heat dissipation openings 29 are uniformly distributed in a circle with the center of the transverse cavity 2 as the center, and at the same time, the three heat dissipation openings 29 form three support plates 48 on the fixed disc one 9 and the fixed disc two 19, the structure of the three support plates 48 makes the fixed disc one 9 and the fixed disc two 19 reduce the weight while improving the stability of the structure.

[0046] The three heat dissipation openings 29 are all fan-shaped openings, and the inner bottom wall and the inner top wall of the three heat dissipation openings 29 are fixedly connected with a plurality of heat dissipation fins 30, wherein the heat dissipation fins 30 of the inner bottom wall and the heat dissipation fins 30 of the inner top wall are staggered.

[0047] The heat dissipation fins 30 are provided with a plurality of heat dissipation holes, and the plurality of heat dissipation holes are arrayed, so as to increase the heat exchange area of the heat dissipation fins 30.

[0048] The fixed disc one 9 and the fixed disc two 19 are internally provided with oil injection cavities 31, wherein the fixed disc one 9 and the fixed disc two 19 are internally provided with a plurality of oil injection holes 32, the oil injection holes 32 are arranged in a circumferential array, the oil injection holes 32 are in communication with the oil injection cavities 31, and the oil injection holes 32 are internally provided with oil injection nozzles one.

[0049] As Figure 1 , the shell 1 is externally provided with an oil tank and a pump body, the input end of the pump body is in communication with the oil tank through a pipeline, the output end of the pump body is in communication with an oil inlet main pipe 33 through a pipeline, the oil inlet main pipe 33 is located on the outer side of the shell 1, the oil inlet main pipe 33 is in communication with a plurality of oil inlet branch pipes 34, four of the oil inlet branch pipes 34 penetrate through the shell 1 to be in communication with the oil injection cavities 31 of the two fixed disc ones 9 and the two fixed disc twos 19 in the transverse cavity 2, and the remaining two oil inlet branch pipes 34 are fixedly connected with oil injection nozzles two at one end penetrating through the shell 1, and the two oil injection nozzles two are located above the meshing positions of the bevel gear one 6 and the two bevel gear twos 10 to lubricate the bevel gear one 6 and the bevel gear twos 10.

[0050] As Figure 4 , the transverse cavity 2 is internally provided with an oil collecting groove 35 at the lower side, the length direction of the oil collecting groove 35 is parallel to the axis of the transverse cavity 2, the lowest point of the groove bottom of the oil collecting groove 35 is located at the center point, so that the oil in the oil collecting groove 35 is gathered at the center point of the oil collecting groove 35, the center position of the oil collecting groove 35 is provided with an oil filter port 36 penetrating through the shell 1, the oil filter port 36 is fixedly connected with a magnetic oil filter, and the outer side of the shell 1 is in communication with the oil tank through a pipeline at the oil filter port 36.

[0051] As Figure 6 , the fixed disc one 9 and the fixed disc two 19 are additionally internally provided with cooling cavities 37, the cooling cavities 37 do not interfere with the oil injection cavities 31, the cooling cavities 37 include outer ring cavities 38 and inner ring cavities 39, the outer ring cavities 38 and the inner ring cavities 39 are concentrically arranged, and three communication cavities 40 are arranged in communication between the outer ring cavities 38 and the inner ring cavities 39.

[0052] The fixed disc one 9 and the fixed disc two 19 are provided with liquid inlet ports 41 and liquid outlet ports 42, the liquid inlet ports 41 and the liquid outlet ports 42 are in communication with the outer ring cavities 38, the outer ring cavities 38 are fixedly connected with baffle plates 43 between the liquid inlet ports 41 and the liquid outlet ports 42, and the baffle plates 43 are used to make the cooling liquid flowing through the cooling cavities 37 and then flowing out through the liquid outlet ports 42, so as to realize circulating cooling.

[0053] The liquid inlet ports 41 on the fixed disc one 9 and the fixed disc two 19 are fixedly connected with liquid inlet branch pipes 44, and a plurality of liquid inlet branch pipes 44 penetrate through the shell 1 and are fixedly connected with a liquid inlet main pipe 45 for cooling liquid input.

[0054] Both the liquid outlet 42 on the fixed plate 19 and the fixed plate 219 are fixedly connected to the liquid outlet branch pipe 46. Multiple liquid outlet branch pipes 46 penetrate the housing 1 and are fixedly connected to the main liquid outlet pipe 47 for coolant output.

[0055] In this embodiment, by setting a "T"-shaped tubular housing 1, the transverse cavity 2 and the longitudinal cavity 3 are vertically connected, and planetary reduction gear sets 4 are symmetrically arranged in the transverse cavity 2, which significantly shortens the overall transmission length, makes the structure compact, reduces space occupation, and improves torsional stiffness.

[0056] The motor 5 is located in the longitudinal cavity 3. The output shaft of the motor 5 drives two symmetrically distributed planetary reduction gear sets 4 through gears to realize bidirectional power transmission, balance the transmission load, reduce vibration and off-center load risks, and improve overall stability and torque output.

[0057] The fan-shaped heat dissipation vents 29 on the first fixed plate 9 and the second fixed plate 19 increase the heat dissipation space for the transverse cavity 2 while reducing the weight. At the same time, heat dissipation fins 30 are set in the heat dissipation vents 29 and cooling chambers 37 are set in the first fixed plate 9 and the second fixed plate 19 to achieve circulating cooling. This allows for rapid heat dissipation and cooling of the heat generated in the housing 1, reducing the working temperature of the planetary reduction gear set 4 and improving the overall service life of the cutting reducer.

[0058] Lubricating oil is sprayed onto the planetary reduction gear set 4 through the oil injection chamber 31 set on the fixed disk 19 and the oil injection nozzle arranged in a circumferential array connected to the oil injection chamber 31, thereby reducing friction and wear during the operation of the planetary reduction gear set 4 and improving the efficiency and service life of the cutting reducer.

[0059] Furthermore, by setting up an oil collection tank 35 to collect and guide the used lubricating oil, and after filtering out metal debris through a magnetic oil filter, it is returned to the oil tank, thereby improving the utilization rate of lubricating oil and reducing oil contamination in the housing 1.

[0060] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0061] It should be pointed out finally that: the above examples are only used to illustrate the technical solutions of the utility model, and not limit it. Although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A long-life mining cutting reduction gear characterized by: The application relates to a shell (1) provided with two planetary reduction gear sets (4), the planetary reduction gear sets (4) are provided with fixed disc one (9) and fixed disc two (19), the fixed disc one (9) and the fixed disc two (19) are provided with oil injection cavities (31), the oil injection cavities (31) are provided with circumferential array oil injection holes (32) on one side, the oil injection holes (32) are embedded with oil injection nozzles one, the fixed disc one (9) and the fixed disc two (19) are provided with cooling cavities (37), the cooling cavities (37) comprise concentric outer ring cavities (38) and inner ring cavities (39) and three communication cavities (40) for communicating the outer ring cavities (38) and the inner ring cavities (39), the fixed disc one (9) and the fixed disc two (19) are provided with liquid inlets (41) and liquid outlets (42) for communicating the outer ring cavities (38), the fixed disc one (9) and the fixed disc two (19) are provided with baffles (43) fixedly connected between the liquid inlets (41) and the liquid outlets (42) in the outer ring cavities (38), and the cooling cavities (37) are circulated with cooling liquid through the liquid inlets (41) and the liquid outlets (42).

2. A long life mining duty reduction gear according to claim 1 wherein: The shell (1) is provided with a transverse cavity (2) and a longitudinal cavity (3), the longitudinal cavity (3) is vertically connected to the center of the transverse cavity (2) along the axis, the transverse cavity (2) and the longitudinal cavity (3) are communicated and perpendicular to each other, and the two planetary reduction gear sets (4) are symmetrically arranged in the transverse cavity (2) with the longitudinal cavity (3) center line as the reference.

3. A long life mining duty reduction gear according to claim 2, characterised in that: The fixed disc one (9) and the fixed disc two (19) are provided with three heat dissipation ports (29), and the three heat dissipation ports (29) are uniformly distributed in a circle with the center of the transverse cavity (2) as the center.

4. A long life mining duty reduction gear according to claim 3 wherein: The inner bottom wall and the inner top wall of the three heat dissipation ports (29) are fixedly connected with a plurality of cooling fins (30), and the cooling fins (30) on the inner bottom wall and the inner top wall of the heat dissipation ports (29) are staggered.

5. A long life mining duty reduction gear according to claim 4 wherein: The cooling fins (30) are provided with a plurality of cooling holes, and the cooling holes are arrayed.

6. A long life mining duty reduction gear according to claim 5 wherein: An oil collecting groove (35) is formed in the lower inner wall of the transverse cavity (2), a filter oil port (36) is formed in the center position of the oil collecting groove (35), and a magnetic oil filter is fixedly connected in the filter oil port (36).

7. A long life mining duty reduction gear according to claim 6 wherein: The shell (1) is provided with an oil tank and a pump body on the outside, the input end of the pump body is communicated with the oil tank through a pipeline, the output end of the pump body is communicated with an oil inlet main pipe (33) through a pipeline, the oil inlet main pipe (33) is located on the outside of the shell (1), a plurality of oil inlet branch pipes (34) are communicated on the oil inlet main pipe (33), four oil inlet branch pipes (34) penetrate through the shell (1) and are communicated with the oil injection cavities (31) of the two fixed disc one (9) and the two fixed disc two (19) in the transverse cavity (2), and the magnetic oil filter is communicated with the oil tank through a pipeline.

8. A long life mining duty reduction gear according to claim 7, characterised in that: The liquid inlet (41) on the fixed disc one (9) and the fixed disc two (19) is fixedly connected with liquid inlet branch pipe (44), a plurality of liquid inlet branch pipe (44) penetrates the shell (1) and is fixedly connected with the liquid inlet manifold (45) for cooling liquid input, the liquid outlet (42) on the fixed disc one (9) and the fixed disc two (19) is fixedly connected with liquid outlet branch pipe (46), a plurality of liquid outlet branch pipe (46) penetrates the shell (1) and is fixedly connected with the liquid outlet manifold (47) for cooling liquid output.

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