Cutting gearbox

Abstract

The utility model belongs to the technical field of gearboxes, and discloses a cutting gearbox. The cutting gearbox includes a housing and a combined planetary gear train. The combined planetary gear train comprises a gear ring, a first-stage planetary assembly and a second-stage planetary assembly. The gear ring is rotationally connected to the shell, and the external structure is connected to the periphery of the gear ring. The first-stage planet assembly comprises a first-stage sun gear, a first-stage planet gear and a first-stage planet carrier. The second-stage planet assembly comprises a second-stage sun wheel, a second-stage planet wheel and a second-stage planet carrier. And the first-stage planet carrier is fixedly connected with the second-stage sun gear. The second-stage planet carrier is fixedly connected to the shell. The first-stage planet gear is rotationally connected to the first-stage planet carrier and engaged with the first-stage sun gear and the gear ring. The second-stage planet gear is rotationally connected to the second-stage planet carrier and engaged with the second-stage sun gear and the gear ring. The first-stage sun gear is configured to rotate around the central axis of the first-stage sun gear. The cutting gear box is high in integration level, few in parts and good in transmission stability, and the service life of the cutting gear box is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of gearboxes, in particular to a cutting gearbox. Background Art

[0002] With the increasing demand for open-pit mining, the demand for mining equipment has also gradually increased. At present, mining is usually carried out by a continuous miner. The continuous miner mainly consists of a driving motor, a cutting gearbox, a cutting head, etc. The cutting gear is used to transmit the driving force output by the driving motor to the cutting head, so it is an important component of the continuous miner.

[0003] At present, the cutting gearboxes in the prior art are mainly formed by combining a "planetary gear train" or a "cylindrical gear train + planetary gear train". Although the transmission can be realized, the structural integration degree is low, the structure is complex, the number of parts is large, and the transmission stability is poor. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a cutting gearbox to solve the above problems existing in the cutting gearbox in the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A cutting gearbox, comprising a housing and a combined planetary gear train, the combined planetary gear train comprising:

[0007] A ring gear, rotatably connected to the housing, and an external structure is connected to the outer periphery of the ring gear;

[0008] A first-stage planetary assembly, comprising a first-stage sun gear, a first-stage planetary gear and a first-stage planetary carrier;

[0009] A second-stage planetary assembly, comprising a second-stage sun gear, a second-stage planetary gear and a second-stage planetary carrier;

[0010] The first-stage planetary carrier is fixedly connected to the second-stage sun gear; the second-stage planetary carrier is fixedly connected to the housing; the first-stage planetary gear is rotatably connected to the first-stage planetary carrier and meshes with both the first-stage sun gear and the ring gear; the second-stage planetary gear is rotatably connected to the second-stage planetary carrier and meshes with both the second-stage sun gear and the ring gear; the first-stage sun gear is configured to be able to rotate about its own central axis.

[0011] As a preferred scheme of the above cutting gearbox, the combined planetary gear train further comprises a sun gear shaft, the first-stage sun gear is fixedly sleeved on the sun gear shaft, the second-stage sun gear is sleeved on the sun gear shaft with a gap, and the sun gear shaft can drive the first-stage sun gear to rotate about its own central axis.

[0012] As a preferred solution of the above-mentioned cutting gearbox, the cutting gearbox further includes a first transmission train. The input end of the first transmission train partially extends out of the housing. The output end of the first transmission train is in transmission connection with the sun gear shaft and can drive the sun gear shaft to rotate around its own central axis;

[0013] Axially along the sun gear shaft, the secondary sun gear is located between the primary sun gear and the first transmission train.

[0014] As a preferred solution of the above-mentioned cutting gearbox, the cutting gearbox further includes a support frame and a first bearing bushing. Axially along the ring gear, one end of the support frame is fixedly connected to the secondary planet carrier, and the other end is fixedly connected to the housing;

[0015] The first bearing bushing is rotatably sleeved on the outer periphery of the support frame. Axially along the ring gear, the first end of the first bearing bushing is also fixedly connected to the first end of the ring gear.

[0016] As a preferred solution of the above-mentioned cutting gearbox, the cutting gearbox further includes a first seal. Axially along the ring gear, the first seal is used to seal the gap at the connection between the first end of the first bearing bushing and the first end of the ring gear; and / or,

[0017] The cutting gearbox further includes a second seal. Axially along the ring gear, the second seal is used to seal the gap between the second end of the first bearing bushing and the support frame.

[0018] As a preferred solution of the above-mentioned cutting gearbox, the cutting gearbox further includes a linkage cover. Axially along the ring gear, the linkage cover covers the second end of the ring gear and is fixedly connected to the second end of the ring gear.

[0019] As a preferred solution of the above-mentioned cutting gearbox, a cooling cavity is formed inside the linkage cover, and a coolant is provided in the cooling cavity.

[0020] As a preferred solution of the above-mentioned cutting gearbox, a cooling flow path is formed inside the housing, and the cooling flow path forms a cooling circuit with an external refrigeration device.

[0021] As a preferred solution of the above-mentioned cutting gearbox, the cutting gearbox further includes a second transmission train and a circulation pump. The second transmission train includes a second input gear fixedly sleeved on the sun gear shaft, and a second output gear rotatably arranged inside the housing. The second input gear and the drive shaft of the circulation pump are both in transmission connection with the second output gear;

[0022] The inlet of the circulation pump is communicated with the interior of the housing, the outlet of the circulation pump is communicated with an external refrigeration device, and the outlet of the external refrigeration device is communicated with the interior of the housing.

[0023] As a preferred solution of the above-mentioned cutting gearbox, along the axial direction of the gear ring, the gear ring is located in the middle area of the external structure.

[0024] Advantages of the present utility model:

[0025] The present utility model provides a cutting gearbox. The cutting gearbox includes a housing and a combined planetary gear train. Among them, the combined planetary gear train includes a gear ring, a first-stage planetary assembly, and a second-stage planetary assembly. The gear ring is rotatably connected to the housing, and an external structure is connected to the outer periphery of the gear ring. The first-stage planetary assembly includes a first-stage sun gear, first-stage planetary gears, and a first-stage planetary carrier. The second-stage planetary assembly includes a second-stage sun gear, second-stage planetary gears, and a second-stage planetary carrier. The first-stage planetary carrier is fixedly connected to the second-stage sun gear. The second-stage planetary carrier is fixedly connected to the housing. The first-stage planetary gears are rotatably connected to the first-stage planetary carrier and are meshed with both the first-stage sun gear and the gear ring. The second-stage planetary gears are rotatably connected to the second-stage planetary carrier and are meshed with both the second-stage sun gear and the gear ring. The first-stage sun gear is configured to be able to rotate about its own central axis.

[0026] When the cutting gearbox works, the first-stage sun gear rotates about its own central axis, driving the first-stage planetary gears to be meshed with both the first-stage sun gear and the gear ring, thereby driving the second-stage planetary gears to be meshed with both the second-stage sun gear and the gear ring. The gear ring rotates about its own central axis under the combined action of the first-stage planetary gears and the second-stage planetary gears. The external structure is connected to the outer periphery of the gear ring to realize the ability to drive the external structure to move.

[0027] Among them, by setting the first-stage planetary gears and the second-stage planetary gears to share a gear ring, compared with the prior art, the integration degree of the cutting gearbox can be effectively improved, and the number of components of the cutting gearbox can be effectively reduced. Secondly, the first-stage planetary gears and the second-stage planetary gears jointly drive the gear ring to rotate about its own central axis, which can effectively improve the supporting effect on the gear ring and effectively improve the stability of driving the gear ring to rotate about its own central axis, thereby effectively improving the transmission stability and service life of the cutting gearbox.

[0028] Therefore, the cutting gearbox has a high integration degree, few components, good transmission stability, and effectively improves the service life of the cutting gearbox. Description of the drawings

[0029] Figure 1 is a schematic structural diagram of the cutting gearbox provided by a specific embodiment of the present utility model from a first perspective;

[0030] Figure 2It is a schematic structural diagram of a cutting gearbox provided by a specific embodiment of the present utility model from the second perspective;

[0031] Figure 3 It is a cross-sectional view of a cutting gearbox provided by a specific embodiment of the present utility model;

[0032] Figure 4 It is a partial cross-sectional view of a cutting gearbox provided by a specific embodiment of the present utility model;

[0033] Figure 5 It is Figure 3 a cross-sectional view along A-A in;

[0034] Figure 6 It is Figure 3 a cross-sectional view along B-B in;

[0035] Figure 7 It is Figure 3 a cross-sectional view along C-C in.

[0036] In the figure:

[0037] 1. Ring gear;

[0038] 2. First planetary assembly; 21. First sun gear; 22. First planetary gear; 23. First planetary carrier;

[0039] 3. Second planetary assembly; 31. Second sun gear; 32. Second planetary gear; 33. Second planetary carrier; 34. First axial positioning member; 35. Second axial positioning member; 36. Third axial positioning member;

[0040] 4. Sun gear shaft;

[0041] 5. First transmission train; 51. Input shaft; 52. First input gear; 53. First output gear; 54. First bearing; 55. Second bearing; 56. Second bearing bushing; 57. First transmission gear;

[0042] 61. Support frame; 62. First bearing bushing; 63. Second seal; 64. Third bearing;

[0043] 71. Linkage cover; 711. Cooling cavity; 72. Fourth bearing;

[0044] 8. Second transmission train; 81. Second input gear; 82. Second output gear;

[0045] 9. Circulation pump;

[0046] 10. Elastic separator;

[0047] 100. Housing;

[0048] 110. The first wear-resistant ring; 120. The second wear-resistant ring; 130. The wear-resistant cover. Detailed implementation manners

[0049] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the accompanying drawings.

[0050] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0051] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0052] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0053] With the increasing demand for open-pit mining, the demand for mining equipment is also gradually increasing. Currently, mining is usually carried out by continuous mining machines. A continuous mining machine mainly consists of a driving motor, a cutting gearbox, and a cutting head, etc. The cutting gear is used to transmit the driving force output by the driving motor to the cutting head, so it is an important component of the continuous mining machine. Currently, the cutting gearboxes in the prior art are mainly formed by combining a "planetary gear train" or a "cylindrical gear train + planetary gear train". Although transmission can be achieved, the structural integration degree is low, the structure is complex, the number of parts is large, and the transmission stability is poor.

[0054] The present utility model provides a cutting gearbox. As Figures 1 to 7 shown, the cutting gearbox includes a housing 100 and a combined planetary gear train. Among them, the combined planetary gear train includes a ring gear 1, a first-stage planetary assembly 2, and a second-stage planetary assembly 3. The ring gear 1 is rotatably connected to the housing 100, and the external structure is connected to the outer periphery of the ring gear 1. The first-stage planetary assembly 2 includes a first-stage sun gear 21, first-stage planetary gears 22, and a first-stage planetary carrier 23. The second-stage planetary assembly 3 includes a second-stage sun gear 31, second-stage planetary gears 32, and a second-stage planetary carrier 33. The first-stage planetary carrier 23 is fixedly connected to the second-stage sun gear 31. The second-stage planetary carrier 33 is fixedly connected to the housing 100. The first-stage planetary gears 22 are rotatably connected to the first-stage planetary carrier 23 and are meshed with both the first-stage sun gear 21 and the ring gear 1. The second-stage planetary gears 32 are rotatably connected to the second-stage planetary carrier 33 and are meshed with both the second-stage sun gear 31 and the ring gear 1. The first-stage sun gear 21 is configured to be able to rotate around its own central axis.

[0055] When the cutting gearbox works, the first-stage sun gear 21 rotates around its own central axis, driving the first-stage planetary gears 22 to be meshed with both the first-stage sun gear 21 and the ring gear 1, thereby driving the second-stage planetary gears 32 to be meshed with both the second-stage sun gear 31 and the ring gear 1. The ring gear 1 is driven to rotate around its own central axis under the combined action of the first-stage planetary gears 22 and the second-stage planetary gears 32. The external structure is connected to the outer periphery of the ring gear 1 to achieve the ability to drive the external structure to move.

[0056] Among them, by setting the first-stage planetary gears 22 and the second-stage planetary gears 32 to share a ring gear 1, compared with the prior art, the integration degree of the cutting gearbox can be effectively improved, and the number of parts of the cutting gearbox can be effectively reduced. Secondly, the first-stage planetary gears 22 and the second-stage planetary gears 32 jointly drive the ring gear 1 to rotate around its own central axis, which can effectively improve the supporting effect on the ring gear 1 and can effectively improve the stability of driving the ring gear 1 to rotate around its own central axis, thereby effectively improving the transmission stability and service life of the cutting gearbox.

[0057] Therefore, the cutting gearbox has a high integration degree, few parts, good transmission stability, and effectively improves the service life of the cutting gearbox.

[0058] It can be understood that, asFigure 3 and Figure 4 As shown, the first - stage planet gears 22 and the second - stage planet gears 32 are axially spaced along the axial direction of the ring gear 1. The first - stage planet carrier 23 is fixedly connected to the connection part of the second - stage sun gear 31, and the second - stage planet gears 32 are axially spaced along the axial direction of the second - stage sun gear 31.

[0059] In this embodiment, exemplarily, the first - stage planet carrier 23 and the second - stage sun gear 31 are connected by splines.

[0060] In this embodiment, as Figure 4 shown, exemplarily, the first - stage planet carrier 23 and the second - stage planet carrier 33 are separated by an elastic separator 10. To ensure the smooth rotation of the first - stage planet carrier 23 around its own central axis, and effectively avoid the wear of the second - stage planet carrier 33 during the rotation of the first - stage planet carrier 23 around its own central axis.

[0061] Among them, as Figures 3 to 6 shown, the combined planetary gear train further includes a sun gear shaft 4. The first - stage sun gear 21 is fixedly sleeved on the sun gear shaft 4, the second - stage sun gear 31 is sleeved on the sun gear shaft 4 with a clearance, and the sun gear shaft 4 can drive the first - stage sun gear 21 to rotate around its own central axis. It can be understood that the second - stage sun gear 31 is provided with a central through - hole, and the sun gear shaft 4 passes through the central through - hole. To achieve the ability to drive the first - stage sun gear 21 to rotate around its own central axis, and reduce the weight of the second - stage sun gear 31.

[0062] In this embodiment, as Figures 3 to 5 shown, preferably, the first - stage sun gear 21 and the sun gear shaft 4 are integrally formed. To improve the structural strength, reduce the number of components, and facilitate assembly. As an alternative solution, the first - stage sun gear 21 can also be key - connected to the sun gear shaft 4.

[0063] It can be understood that, as Figures 3 to 6 shown, the central axis of the ring gear 1, the rotation center line of the ring gear 1, the central axis of the first - stage sun gear 21, the rotation center line of the first - stage sun gear 21, the central axis of the second - stage sun gear 31, the rotation center line of the second - stage sun gear 31, the central axis of the sun gear shaft 4 and the rotation center line of the second - stage sun gear 31 are all collinear.

[0064] In this embodiment, as Figure 4As shown, one axial end of the secondary sun gear 31 is axially positioned by a first axial positioning member 34, and the other axial end of the secondary sun gear 31 is axially positioned by a second axial positioning member 35. Further, the first axial positioning member 34 is fixedly disposed on the end face of the secondary sun gear 31 axially close to the first planetary carrier 23 and / or the first planetary carrier 23. The second axial positioning member 35 is fixedly disposed on the sun gear shaft 4 and abuts against the other axial end face of the secondary sun gear 31. Further, the first axial positioning member 34 is a positioning ring, and the second axial positioning member 35 is a positioning ring or a shoulder on the sun gear shaft 4.

[0065] Specifically, as Figure 3 and Figure 7 shown, the cutting gearbox further includes a first transmission train 5. The input end of the first transmission train 5 partially extends out of the housing 100. The output end of the first transmission train 5 is drivingly connected to the sun gear shaft 4 and can drive the sun gear shaft 4 to rotate about its own central axis.

[0066] Preferably, as Figure 3 shown, axially along the sun gear shaft 4, the secondary sun gear 31 is located between the primary sun gear 21 and the first transmission train 5. If the primary sun gear 21 is disposed between the secondary sun gear 31 and the first transmission train 5, in order to ensure that the ring gear 1 is rotatably connected to the housing 100, the housing 100 needs to be provided on both axial sides of the ring gear 1, and the ring gear 1 needs to be rotatably connected to the housing 100 on both axial sides, resulting in a complex structure of the cutting gearbox, a large number of components, and low integration. Therefore, compared with disposing the primary sun gear 21 between the secondary sun gear 31 and the first transmission train 5, by disposing the secondary sun gear 31 between the primary sun gear 21 and the first transmission train 5, the structure can be further effectively simplified, the weight of the cutting gearbox can be reduced, and the integration of the cutting gearbox can be improved.

[0067] Specifically, in this embodiment, as Figure 3 and Figure 7 shown, the first transmission train 5 includes an input shaft 51, a first input gear 52, and a first output gear 53. The input shaft 51 partially extends out of the housing 100. The first input gear 52 is fixedly sleeved on the input shaft 51. The first input gear 52 and / or the input shaft 51 is rotatably connected to the housing 100. The first output gear 53 is fixedly sleeved on the sun gear shaft 4. The first input gear 52 is drivingly connected to the first output gear 53 to enable the sun gear shaft 4 to rotate about its own central axis. In this embodiment, preferably, the primary sun gear 21 and the first output gear 53 are respectively located at the two axial ends of the sun gear shaft 4. The secondary sun gear 31 is located between the primary sun gear 21 and the first output gear 53.

[0068] In this embodiment, as Figure 3As shown, the exemplary first input gear 52 is rotatably connected to the housing 100 through a first bearing 54. One end of the input shaft 51 extending out of the housing 100 is rotatably connected to a second bearing bushing 56 through a second bearing 55. The second bearing sleeve 56 is fixedly connected to the outside of the housing 100.

[0069] Further, the first transmission gear train 5 further includes a plurality of first transmission gears 57 for drivingly connecting the first input gear 52 and the first output gear 53. In this embodiment, as Figure 7 shown, the exemplary number of the first transmission gears 57 is one, and the first transmission gear 57 meshes with both the first input gear 52 and the first output gear 53.

[0070] Specifically, as Figure 3 and Figure 4 shown, the cutting gearbox further includes a support frame 61. Along the axial direction of the gear ring 1, one end of the support frame 61 is fixedly connected to the secondary planet carrier 33, and the other end is fixedly connected to the housing 100. To realize the fixed connection between the secondary planet carrier 33 and the housing 100.

[0071] Specifically, as Figure 3 shown, the cutting gearbox further includes a first bearing bushing 62. The first bearing bushing 62 is rotatably sleeved on the outer periphery of the support frame 61. Along the axial direction of the gear ring 1, the first end of the first bearing bushing 62 is also fixedly connected to the first end of the gear ring 1. To realize the rotational connection between the gear ring 1 and the housing 100. Secondly, along the axial direction of the gear ring 1, the gear ring 1, the first bearing bushing 62, the support frame 61 and the housing 100 are equivalent to form a combined housing, which can cover the first planetary assembly 2, the secondary planetary assembly 3, the first input gear 52, the first transmission gear 57, the first output gear 53 and at least part of the input shaft 51 in the combined housing, so as to avoid foreign debris and the like from entering the combined housing 100 and affecting the service life of the combined planetary gear train and / or the first transmission gear train 5. It can be understood that the first bearing bushing 62 rotates synchronously with the gear ring 1 around the central axis of the gear ring 1.

[0072] In this embodiment, as Figure 3 shown, the first bearing bushing 62 is rotatably connected to the outer periphery of the support frame 61 through a third bearing 64. The first bearing bushing 62 is detachably connected to the first end of the gear ring 1 by screws.

[0073] In this embodiment, as Figure 4 shown, one end of the support frame 61 close to the secondary sun gear 31 along the axial direction is limited in the axial position by a third axial positioning member 36. Further, the third axial positioning member 36 is fixedly arranged on the second axial positioning member 35 and / or the support frame 61. Further, the third axial positioning member 36 is a positioning ring or a shoulder on the sun gear shaft 4.

[0074] Preferably, the cutting gearbox further includes a first seal. Along the axial direction of the ring gear 1, the first seal is used to seal the gap at the connection between the first end of the first bearing bushing 62 and the first end of the ring gear 1, so as to further prevent external debris and the like from entering the combined housing 100 and affecting the service life of the combined planetary gear train and / or the first transmission gear train 5.

[0075] Preferably, as Figure 4 shown, the cutting gearbox further includes a second seal 63. Along the axial direction of the ring gear 1, the second seal 63 is used to seal the gap between the second end of the first bearing bushing 62 and the support frame 61, so as to further prevent external debris and the like from entering the combined housing 100 and affecting the service life of the combined planetary gear train and / or the first transmission gear train 5.

[0076] Specifically, as Figures 1 to 3 shown, the cutting gearbox further includes a linkage cover 71. Along the axial direction of the ring gear 1, the linkage cover 71 covers the second end of the ring gear 1 and is fixedly connected to the second end of the ring gear 1. With such a setting, the linkage cover 71 and the combined housing form a closed housing, thereby being able to further prevent external debris and the like from entering the combined housing 100 and affecting the service life of the combined planetary gear train and / or the first transmission gear train 5. It can be understood that the linkage cover 71 rotates synchronously with the ring gear 1 around the central axis of the ring gear 1.

[0077] In this embodiment, as Figures 1 to 3 shown, the linkage cover 71 is rotatably connected to the outer periphery of the sun gear shaft 4 through a fourth bearing 72, so as to further improve the stability and reliability of rotatably connecting the ring gear 1 to the housing 100. Further, in this embodiment, along the axial direction of the sun gear shaft 4, the fourth bearing 72 is relatively far from the first-stage planetary gear 22 compared to the second-stage planetary gear 32.

[0078] Preferably, as Figures 1 to 3 shown, a cooling cavity 711 is formed inside the linkage cover 71, and a coolant is provided in the cooling cavity 711, so as to be able to cool and dissipate heat from the components inside the closed housing 100.

[0079] Preferably, a cooling flow path is formed inside the housing 100, and the cooling flow path and an external refrigeration device form a cooling circuit, which can also cool and dissipate heat from the components inside the closed housing 100, thereby being able to further improve the effect of cooling and dissipating heat from the components inside the closed housing 100. Specifically, there is a coolant in the cooling flow path. Among them, the specific structure of the external refrigeration device belongs to the prior art and will not be elaborated here.

[0080] Further preferably, the housing 100 is further provided with a jet port communicating with the cooling flow path, and a switching valve is provided at the jet port. When the switching valve is opened, the jet port can eject the coolant outward, and the coolant can wash away debris and the like on the outer periphery of the housing 100, avoiding the accumulation of debris and the like on the outer periphery of the housing 100 and affecting the rotation of the external structure connected to the outer periphery of the gear ring 1 and the like. It can be understood that the jet port can also be used as a coolant filling port.

[0081] Preferably, as Figure 3 shown, the cutting gearbox further includes a second transmission train 8 and a circulation pump 9. The second transmission train 8 includes a second input gear 81 fixedly sleeved on the sun gear shaft 4, and a second output gear 82 rotatably arranged in the housing 100. The driving shafts of both the second input gear 81 and the circulation pump 9 are in transmission connection with the second output gear 82. The inlet of the circulation pump 9 communicates with the inside of the housing 100, the outlet of the circulation pump 9 communicates with an external refrigeration device, and the outlet of the external refrigeration device communicates with the inside of the housing 100. By circulating and cooling the lubricating fluid in the closed housing 100 through the external cooling device, the effect of cooling and dissipating heat of the components in the closed housing 100 can be further improved.

[0082] In this embodiment, as Figure 3 shown, preferably, the circulation pump 9 is distributed in the closed housing 100, and the housing of the circulation pump 9 is fixedly connected to the housing 100. It can not only ensure the effect of cooling and dissipating heat of the components in the closed housing 100, but also further improve the integration degree of the cutting gearbox. As an alternative solution, the circulation pump 9 is arranged outside the closed housing 100. It can also ensure the effect of cooling and dissipating heat of the components in the closed housing 100.

[0083] In this embodiment, as Figure 3 shown, exemplarily, along the axial direction of the sun gear shaft 4, the second input gear 81 is located between the support frame 61 and the first output gear 53. The second input gear 81 is also detachably connected to the first output gear 53 by screws.

[0084] In this embodiment, as Figure 3 shown, the second input gear 81 and the second output gear 82 are meshed. As an alternative solution, the second transmission train 8 further includes a plurality of second transmission gears for transmitting and connecting the second input gear 81 and the second output gear 82.

[0085] In this embodiment, the driving shaft is key-connected to the second output gear 82.

[0086] Preferably, along the axial direction of the gear ring 1, the gear ring 1 is located in the middle area of the external structure. Since the linkage cover 71 and the first transmission gear train 5 are respectively located at both axial ends of the gear ring 1. Therefore, setting the gear ring 1 in the middle area of the external structure can not only further improve the stability of driving the external structure to move through the gear ring 1, but also maximize the span of the external structure along the axial direction of the gear ring 1, thereby improving the working performance of the external structure.

[0087] In this embodiment, the external structure is a drum fixedly sleeved on the outer periphery of the gear ring 1. Cutting heads are fixedly arranged on the outer periphery of the drum. During the process of the gear ring 1 driving the drum to rotate, the cutting heads cut the open-pit mine. By setting the gear ring 1 in the middle area of the drum, it can not only further improve the stability of driving the drum to rotate through the gear ring 1, but also maximize the axial span of the drum, so that more cutting heads can be arranged on the outer periphery of the drum, thereby effectively improving the efficiency and stability of the cutting gearbox for mining the open-pit mine.

[0088] Preferably, as Figures 1 to 3 shown, the cutting gearbox further includes a first wear-resistant ring 110. The first wear-resistant ring 110 is sleeved on at least part of the first bearing bush 62 with a gap, and the first wear-resistant ring 110 is sleeved on the part of the support frame 61 exposed to the outside, and the first wear-resistant ring 110 is fixedly connected to the support frame 61. So as to protect the sleeve part of the first bearing bush 62 and the support frame 61 on the premise of ensuring that the first bearing bush 62 can rotate, and can protect the outer peripheries of the first bearing bush 62 and the support frame 61 from being worn.

[0089] Preferably, as Figures 1 to 3 shown, the cutting gearbox further includes a second wear-resistant ring 120. The second wear-resistant ring 120 is sleeved on the outer periphery of the housing 100 and fixedly connected to the housing 100. So as to protect the outer periphery of the housing 100 from being worn.

[0090] Preferably, as Figures 1 to 3 shown, the cutting gearbox further includes a wear-resistant cover 130. The wear-resistant cover 130 covers the end face of the housing 100 along the axial direction of the gear ring 1 and away from the gear ring 1. So as to protect the end face of the housing 100 along the axial direction of the gear ring 1 and away from the gear ring 1 from being worn.

[0091] Specifically, in this embodiment, the first wear-resistant ring 110, the second wear-resistant ring 120 and the wear-resistant cover 130 are all formed by the surfacing wear-resistant layer process. It can effectively avoid the premature failure of the first bearing bush 62, the support frame 61 and the housing 100, and can effectively improve the service life of the first bearing bush 62, the support frame 61 and the housing 100.

[0092] Specifically, in this embodiment, as Figures 1 to 3As shown, the first wear-resistant ring 110, the second wear-resistant ring 120 and the wear-resistant cover 130 form a combined wear-resistant structure that is axially continuous along the sun gear shaft 4, so as to further improve the protection effect. Secondly, the first wear-resistant ring 110, the second wear-resistant ring 120 and the wear-resistant cover 130 are separately formed. This facilitates installation and disassembly, and subsequent maintenance of the cutting gearbox.

[0093] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A cutting gearbox, comprising a housing (100) and a combined planetary gear train, characterized in that: The combined planetary gear train comprises: A gear ring (1) is rotatably connected to the housing (100), and an external structure is connected to the outer periphery of the gear ring (1); A first-stage planetary assembly (2), comprising a first-stage sun gear (21), a first-stage planetary gear (22) and a first-stage planet carrier (23); A secondary planetary assembly (3), comprising a secondary sun gear (31), a secondary planetary gear (32) and a secondary planet carrier (33); The primary planet carrier (23) is fixedly connected to the secondary sun gear (31); the secondary planet carrier (33) is fixedly connected to the housing (100); the primary planet gear (22) is rotationally connected to the primary planet carrier (23) and meshes with both the primary sun gear (21) and the ring gear (1); the secondary planet gear (32) is rotationally connected to the secondary planet carrier (33) and meshes with both the secondary sun gear (31) and the ring gear (1); the primary sun gear (21) is configured to be able to rotate around its own central axis.

2. The cutting gearbox according to claim 1, characterized in that: The combined planetary gear system further comprises a sun gear shaft (4), the first-stage sun gear (21) is fixedly sleeved on the sun gear shaft (4), the second-stage sun gear (31) is loosely sleeved on the sun gear shaft (4), and the sun gear shaft (4) can drive the first-stage sun gear (21) to rotate around its own central axis.

3. The cutting gearbox according to claim 2, characterized in that: The cutting gear box further comprises a first transmission gear train (5), the input end portion of the first transmission gear train (5) protruding from the housing (100), the output end of the first transmission gear train (5) being in transmission connection with the sun gear shaft (4) and capable of driving the sun gear shaft (4) to rotate around its own central axis; Along the axial direction of the sun gear shaft (4), the secondary sun gear (31) is located between the primary sun gear (21) and the first transmission gear train (5).

4. The cutting gearbox according to any one of claims 1 to 3, characterized in that: The cutting gearbox further comprises a support frame (61) and a first bearing bushing (62); along the axial direction of the ring gear (1), one end of the support frame (61) is fixedly connected to the secondary planetary frame (33), and the other end is fixedly connected to the housing (100); The first bearing sleeve (62) is rotatably sleeved on the outer periphery of the support frame (61), and along the axial direction of the gear ring (1), the first end of the first bearing sleeve (62) is also fixedly connected to the first end of the gear ring (1).

5. The cutting gearbox according to claim 4, characterized in that: The cutting gearbox further comprises a first seal, which is used to seal a gap at a connection between a first end of the first bearing bushing (62) and a first end of the gear ring (1) in an axial direction of the gear ring (1); and / or, The cutting gearbox further comprises a second seal (63), and along the axial direction of the gear ring (1), the second seal (63) is used to seal the gap between the second end of the first bearing bushing (62) and the support frame (61).

6. The cutting gearbox according to any one of claims 1 to 3, characterized in that: The cutting gear box further comprises a linkage cover (71), which is arranged on the second end of the gear ring (1) along the axial direction of the gear ring (1) and is fixedly connected to the second end of the gear ring (1).

7. The cutting gearbox according to claim 6, characterized in that: A cooling cavity (711) is formed inside the linkage cover (71), and a cooling liquid is provided in the cooling cavity (711).

8. The cutting gearbox according to any one of claims 1 to 3, characterized in that: A cooling flow path is formed inside the shell (100), and the cooling flow path and an external refrigeration device form a temperature reduction circuit.

9. The cutting gearbox according to any one of claims 2 to 3, characterized in that: The cutting gear box further comprises a second transmission gear train (8) and a circulation pump (9), wherein the second transmission gear train (8) comprises a second input gear (81) fixedly sleeved on the sun gear shaft (4), and a second output gear (82) rotatably arranged in the housing (100), and the second input gear (81) and the drive shaft of the circulation pump (9) are both in transmission connection with the second output gear (82); The inlet of the circulation pump (9) is in communication with the interior of the housing (100), the outlet of the circulation pump (9) is in communication with an external refrigeration device, and the outlet of the external refrigeration device is in communication with the interior of the housing (100).

10. The cutting gearbox according to any one of claims 1 to 3, characterized in that: Along the axial direction of the gear ring (1), the gear ring (1) is located in the middle area of ​​the external structure.

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