Gearbox, power assembly and drilling machine

Abstract

The utility model relates to the technical field of gearboxes, and discloses a gearbox, a power assembly and a drilling machine. According to the gearbox, the power assembly and the drilling machine, the gearbox, the power assembly and the drilling machine comprise a box body, a transmission shaft, a main shaft, a gear shifting gear, a high-speed gear, a reduction gear, a speed increasing gear and a neutral gear section, and by adjusting the position of the gear shifting gear on the transmission shaft, the gearbox can be switched between a high-speed mode and a low-speed large-torque mode. In the deep drilling process, a low-speed large-torque mode is selected, the torque output by the main shaft is increased through the reduction gear, the phenomenon of car building caused by insufficient output torque of the motor is effectively avoided, the power head and the main shaft are protected against damage, and the safety and efficiency of exploration operation are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gearboxes, for example to a gearbox, a power assembly and a drilling machine. BACKGROUND

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] In the geological exploration industry, efficient and stable operation of construction equipment is crucial to ensure the smooth progress of exploration operations. Traditional small and medium-sized construction equipment power heads often use a direct hydraulic piston motor as a power source. Although this design has the advantages of large starting torque and durable motor structure, it has significant limitations in actual application. Specifically, the hydraulic piston motor can usually achieve a high speed (such as 1024 rpm) under constant pressure. However, when the exploration construction reaches a depth of 0-800 meters in the potential layer, especially close to or exceeding 800 meters, the motor output torque often cannot meet the requirements of deep drilling, resulting in a stalled vehicle phenomenon, and in severe cases, the power head and main shaft can be damaged, causing serious accidents that not only affect the progress of exploration, but also increase maintenance costs and safety risks. SUMMARY

[0004] The present application provides a gearbox, a power assembly and a drilling machine. By adjusting the position of the gear shift gear on the transmission shaft, the gearbox can switch between high-speed mode and low-speed high-torque mode. During deep drilling, the low-speed high-torque mode is selected to increase the torque output by the main shaft through the reduction gear, effectively avoiding the stalled vehicle phenomenon caused by insufficient motor output torque, protecting the power head and main shaft from damage, and improving the safety and efficiency of exploration operations.

[0005] In a first aspect, a gearbox is provided, comprising: a gearbox body, a transmission shaft, a main shaft, a gear shift gear, a high-speed gear, a reduction gear, a speed-up gear, and a neutral section.

[0006] The gearbox body is used to house and protect the internal components of the gearbox.

[0007] The transmission shaft is at least partially rotatably disposed in the gearbox body, with one end connected to a power input mechanism.

[0008] The main shaft is at least partially rotatably disposed in the gearbox body, with one end used to output power.

[0009] The gear shift gear is disposed on the transmission shaft and can slide axially along the transmission shaft.

[0010] The high-speed gear is rotatably disposed on the transmission shaft and is spaced apart from the gear shift gear. The side facing the gear shift gear is provided with a tooth groove for meshing and driving the gear shift gear.

[0011] A speed-reducing gear is arranged on the main shaft and can engage with the gear shift gear;

[0012] A speed-increasing gear is arranged on the main shaft and engages with the high-speed gear;

[0013] A neutral gear is arranged on the main shaft and is located between the speed-reducing gear and the speed-increasing gear.

[0014] Optionally, the gearbox further comprises a shift fork, a shift fork arm, a shift fork shaft, a gear lever, a gear position positioning slot, and a gear position positioning plug.

[0015] The shift fork is slidingly assembled with the gear shift gear.

[0016] The shift fork arm is connected with the shift fork.

[0017] The shift fork shaft is rotatably connected with the box body, penetrates to the inside of the box body and is connected with the shift fork arm at one end, and penetrates to the outside of the box body at the other end.

[0018] The gear lever is located outside the gearbox and is hingedly connected with the shift fork shaft.

[0019] The gear position positioning slot is arranged on the box body.

[0020] The gear position positioning plug is arranged on the gear lever and can be selectively matched with the gear position positioning slot.

[0021] Optionally, the gear shift gear is provided with an annular groove, and the annular groove can be inserted into the shift fork.

[0022] Optionally, the gearbox further comprises a main shaft top cover, a first skeleton oil seal, a second skeleton oil seal, a main shaft bearing, a first oil injection nozzle, and a first oil injection channel.

[0023] The main shaft top cover is fixed to the box body and is used for sealing the upper end of the main shaft and serving as an upper end sealing member of a lubricating system.

[0024] The first skeleton oil seal is arranged between the main shaft top cover and the main shaft.

[0025] The second skeleton oil seal is arranged between the main shaft and the box body.

[0026] The main shaft bearing is installed on the main shaft and is located between the first skeleton oil seal and the second skeleton oil seal.

[0027] The first oil injection nozzle is arranged on the main shaft top cover.

[0028] The first oil injection channel is arranged on the main shaft top cover and connects the first oil injection nozzle and the main shaft bearing.

[0029] Optionally, the gearbox further comprises a first water injection channel, a mandrel, a water connector housing, a water connector, a water seal gland, a water seal, and a spring.

[0030] The first water injection channel is arranged on the main shaft.

[0031] The mandrel is arranged coaxially with the main shaft, rotates and is in airtight connection with the main shaft, and has a second water injection channel in communication with the first water injection channel.

[0032] The water connector shell is sleeved on the main shaft and is connected with the main shaft top cover.

[0033] The water pipe connector is sleeved on the upper end of the mandrel.

[0034] The water seal gland is arranged between the water pipe connector and the water connector shell, and the upper end is connected with the water pipe connector and the lower end is movably connected with the water connector shell.

[0035] The water seal is arranged between the mandrel, the water pipe connector and the water seal gland.

[0036] The spring is arranged between the water seal gland and the water connector shell.

[0037] Optionally, a third skeleton oil seal is arranged between the water connector shell and the main shaft.

[0038] Optionally, the gearbox further comprises a transmission shaft top cover, a transmission shaft wear-resistant sleeve, an oil seal fixing cover, a fourth skeleton oil seal, a transmission shaft bearing, a second oil injection nozzle and a second oil injection channel.

[0039] The transmission shaft top cover is fixed on the box body and is used for sealing the upper end of the transmission shaft and serving as an upper end sealing member of the lubricating system.

[0040] The transmission shaft wear-resistant sleeve is sleeved on the transmission shaft.

[0041] The oil seal fixing cover is arranged between the transmission shaft top cover and the transmission shaft wear-resistant sleeve.

[0042] The fourth skeleton oil seal is arranged between the transmission shaft wear-resistant sleeve and the oil seal fixing cover.

[0043] The transmission shaft bearing is installed on the transmission shaft and is arranged above the fourth skeleton oil seal.

[0044] The second oil injection nozzle is arranged on the transmission shaft top cover.

[0045] The second oil injection channel is arranged on the transmission shaft top cover and is in communication with the second oil injection nozzle and the transmission shaft bearing.

[0046] Optionally, an axial sliding track for supporting the axial movement of the gear shifting gear is arranged on the transmission shaft.

[0047] In a second aspect, a power assembly is provided, and the gearbox of the first aspect or any one of the embodiments of the first aspect is provided, and one end of the transmission shaft is connected with a hydraulic ram motor or a cycloid motor.

[0048] In a third aspect, a drilling machine is provided, comprising the power assembly of the second aspect.

[0049] The gearbox, the power assembly and the drilling machine provided in the present application can achieve the following technical effects:

[0050] By adjusting the position of the gear on the transmission shaft, the gearbox can switch between the high-speed mode and the low-speed high-torque mode. In deep drilling, the low-speed high-torque mode is selected to increase the torque output by the main shaft through the reduction gear, effectively avoiding the phenomenon of car stalling due to insufficient motor output torque, protecting the power head and the main shaft from damage, and improving the safety and efficiency of exploration operations.

[0051] The foregoing general description and the following description are only exemplary and explanatory, and are not intended to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0052] One or more embodiments are exemplified by the accompanying drawings corresponding thereto, which are exemplary and explanatory and do not constitute a limitation on the embodiments, elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute a proportional limitation, and wherein:

[0053] Figure 1 is a schematic view of a cross section of a gearbox provided by an embodiment of the present disclosure;

[0054] Figure 2 is a schematic view of a cross section of a gearbox provided by an embodiment of the present disclosure; Figure 1 is a schematic view of a cross section of a gearbox provided by an embodiment of the present disclosure;

[0055] Figure 3 is a schematic view of a cross section of a gearbox provided by an embodiment of the present disclosure; Figure 1 is a schematic view of a cross section of a gearbox provided by an embodiment of the present disclosure;

[0056] Figure 4 is a schematic view of a cross section of a gearbox provided by an embodiment of the present disclosure; Figure 1 is a schematic view of a cross section of a gearbox provided by an embodiment of the present disclosure;

[0057] Figure 5 is a schematic view of a cross section of a gearbox provided by an embodiment of the present disclosure; Figure 1 is a schematic view of a cross section of a gearbox provided by an embodiment of the present disclosure;

[0058] Figure 6 is a schematic view of a gearbox provided by an embodiment of the present disclosure;

[0059] Figure 7 is a schematic view of a gearbox provided by an embodiment of the present disclosure.

[0060] REFERENCE SIGNS:

[0061] 1, cycloid motor; 2, gearbox;

[0062] 3, drive shaft; 31, second oil nozzle; 32, drive shaft top cover; 33, drive shaft bearing; 34, drive shaft wear sleeve; 35, oil seal fixing cover; 36, fourth skeleton oil seal; 37, strong magnet;

[0063] 4, main shaft; 41, main shaft bearing; 42, main shaft top cover; 43, first oil nozzle; 44, first skeleton oil seal; 45, second skeleton oil seal; 46, main shaft wear sleeve; 47, first roller bearing; 48, first inclined roller bearing; 49, main shaft bottom cover;

[0064] 5, mandrel; 6, water pipe joint; 61, water seal gland; 62, spring; 63, water joint shell; 64, water seal;

[0065] 7, gear shifting gear; 71, shift fork; 72, shift fork arm; 73, shift fork shaft; 74, gearshift handle; 75, gearshift positioning slot;

[0066] 8, high speed gear; 9, reduction gear; 10, speed-up gear. DETAILED DESCRIPTION

[0067] In order to enable a more detailed understanding of the features and technical content of the disclosed embodiments, the implementation of the disclosed embodiments will be described in detail below with reference to the accompanying drawings, which are for reference only and do not limit the disclosed embodiments. In the following technical description, for the sake of easy explanation, through multiple details, a full understanding of the disclosed embodiments is provided. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to show.

[0068] The terms "first", "second", and the like in the specification and claims of the disclosed embodiments and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the disclosed embodiments described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0069] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0070] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0071] It should be noted that the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0072] In combination Figures 1-7 As shown, the embodiments of the present disclosure provide a gearbox, which comprises a box body 2, a transmission shaft 3, a main shaft 4, a gear shifting gear 7, a high-speed gear 8, a speed reduction gear 9, a speed increasing gear 10, and a neutral section.

[0073] The box body 2 is used to accommodate and protect the internal components of the gearbox.

[0074] The transmission shaft 3 is at least partially rotatably arranged in the box body 2, and one end is used to connect with a power input mechanism. It is made of high-strength alloy steel and is installed in the box body 2 through a high-precision roller bearing. A standard interface is arranged on the upper end of the transmission shaft 3, which facilitates quick connection with the power input mechanism (such as a hydraulic motor). An axial sliding track is arranged on the transmission shaft 3, which is used to support the axial movement of the gear shifting gear 7.

[0075] The main shaft 4 is at least partially rotatably arranged in the box body 2, and one end is used to output power. It is made of high-strength alloy steel and is installed on the box body 2 through an inclined roller bearing. One end of the main shaft 4 is designed as a power output interface, which can be directly connected with drilling tools and other construction equipment.

[0076] The shift gear 7 is arranged on the transmission shaft 3 and can slide axially along the transmission shaft 3; the axial sliding of the shift gear 7 on the transmission shaft 3 is controlled by an operating mechanism (such as a handle), so as to selectively engage with the high-speed gear 8 or the reduction gear 9. The shift gear 7 is provided with a strong magnet 37 arranged on the transmission shaft 3, and the strong magnet 37 is provided with a nylon pad on the side surface facing downward, and the nylon pad is fixed by an outer circlip.

[0077] The high-speed gear 8 is rotationally arranged on the transmission shaft 3 and is arranged in a spaced manner with the shift gear 7, and the side surface of the high-speed gear 8 facing the shift gear 7 is provided with a gear groove for engaging with the shift gear 7; the high-speed gear 8 is kept in constant engagement with the speed-up gear 10. When the shift gear 7 engages with the high-speed gear 8, the main shaft 4 obtains a higher speed output through the speed-up gear 10, which is suitable for shallow drilling or a situation requiring rapid feeding.

[0078] The reduction gear 9 is arranged on the main shaft 4 and can engage with the shift gear 7; the reduction gear 9 is arranged on the main shaft 4 and corresponds to another engagement position of the shift gear 7. When the shift gear 7 slides to engage with the reduction gear 9, the main shaft 4 obtains a lower speed and a higher torque output through the reduction gear 9, which is particularly suitable for deep drilling or a scene requiring large torque operation. The reduction gear 9 is provided with a main shaft 4 wear-resistant sleeve above the reduction gear 9, the wear-resistant sleeve limits the upper part of the reduction gear 9, and an O-ring is arranged between the wear-resistant sleeve and the main shaft 4.

[0079] The speed-up gear 10 is arranged on the main shaft 4 and engages with the high-speed gear 8; the speed-up gear 10 is designed in an integrated manner with the main shaft 4.

[0080] The neutral section is arranged on the main shaft 4 and is arranged between the reduction gear 9 and the speed-up gear 10. The neutral section is a region without engagement transmission. When the shift gear 7 does not engage with the high-speed gear 8 or the reduction gear 9, the main shaft 4 is in a neutral state, at this time, there is no power transmission between the power input mechanism and the main shaft 4, which is convenient for gear shifting operation or emergency shutdown.

[0081] By adjusting the position of the shift gear 7 on the transmission shaft 3, the gearbox provided by the embodiment of the present disclosure can switch between the high-speed mode and the low-speed large-torque mode. In the deep drilling process, the low-speed large-torque mode is selected, the torque output of the main shaft 4 is increased through the reduction gear 9, the phenomenon of car stalling caused by insufficient motor output torque is effectively avoided, the power head and the main shaft 4 are protected from damage, and the safety and efficiency of the exploration operation are improved.

[0082] Optionally, the gearbox further comprises a shift fork 71, a shift fork arm 72, a shift fork shaft 73, a gear shift handle 74, a gear shift positioning slot 75, and a gear shift positioning plug.

[0083] Shifting fork 71, slidingly assembled with the shift gear 7; the shape is rectangular slider, to ensure that the shift gear 7 can be stably pushed or pulled along the transmission shaft 3 axial sliding during the shifting process.

[0084] Shifting fork arm, connected with the shifting fork 71; the shifting fork arm is rigidly connected or rotatably connected with the shifting fork 71, as a connecting bridge between the shifting fork 71 and the shifting fork shaft.

[0085] Shifting fork shaft, rotatably connected with the box 2, one end penetrates to the inside of the box 2 and is connected with the shifting fork arm, the other end penetrates to the outside of the box 2; the shifting fork shaft is designed as an elongated shaft penetrating the box 2, the middle part is rotatably connected with the box 2 through a bearing, and the other end penetrates to the outside of the box 2, which is convenient for connection with the gear handle 74. The shifting fork arm is provided with a connecting structure matched with the shifting fork arm, such as a pin hole or a threaded hole, to realize stable connection with the shifting fork arm.

[0086] Gear handle 74, located outside the gearbox, hinged with the shifting fork shaft; convenient for direct operation by the operator. The gear handle 74 is provided with a connecting structure, such as a pin shaft, hinged with the shifting fork shaft, to realize the rotating action.

[0087] Gear positioning slot 75, provided on the box 2; usually including a series of grooves or holes distributed in the circumferential direction, used for cooperation with the gear positioning plug to realize accurate positioning and locking of the gear.

[0088] Gear positioning plug, provided on the gear handle 74, cooperates with the gear positioning slot 75. During the shifting process, the gear positioning plug will move with the rotation or push-pull of the gear handle 74, and when it moves to the target gear, the plug will be inserted into the corresponding positioning slot to realize the locking of the gear.

[0089] The operator rotates or pushes and pulls the gear handle 74 to drive the shifting fork shaft to rotate on the box 2.

[0090] The movement of the shifting fork shaft is transmitted to the shifting fork 71 through the shifting fork arm, and the shifting fork 71 pushes or pulls the shift gear 7 to slide along the transmission shaft 3.

[0091] When the shift gear 7 slides to the target position (such as meshing with the high-speed gear 8 or the reduction gear 9), the gear positioning plug is inserted into the corresponding gear positioning slot 75 to realize accurate positioning and locking of the gear.

[0092] At this time, the transmission ratio of the gearbox changes, and the rotation speed and torque output by the main shaft 4 are also adjusted to adapt to different drilling requirements.

[0093] Optionally, the shift gear 7 is provided with an annular groove, and the annular groove can be inserted into the shifting fork 71.

[0094] Optionally, the gearbox further comprises: a main shaft top cover 42, a first skeleton oil seal 44, a second skeleton oil seal 45, a main shaft bearing 41, a first oil injection nozzle 43, and a first oil injection channel;

[0095] The main shaft top cover is fixed to the box body 2 and is used to seal the upper end of the main shaft 4 and serve as an upper end sealing member of the lubricating system. The main shaft top cover is fixed to the box body 2 by means of bolts or other fastening devices. The main shaft top cover is not only used to seal the upper end of the main shaft 4, but also serves as an upper end sealing member of the lubricating system to prevent lubricating oil from leaking. The main shaft top cover provides a closed environment for the inside of the gearbox, and the structural design (such as the oil injection nozzle and the oil injection channel) on the main shaft top cover facilitates the addition and distribution of lubricating oil.

[0096] The first skeleton oil seal 44 is arranged between the main shaft top cover and the main shaft 4 and prevents lubricating oil from leaking to the outside during the rotation of the main shaft 4.

[0097] The second skeleton oil seal 45 is arranged between the main shaft 4 and the box body 2 and prevents lubricating oil from leaking to the inside during the rotation of the main shaft 4.

[0098] The main shaft bearing is installed on the main shaft 4 and is arranged between the first skeleton oil seal 44 and the second skeleton oil seal 45. The main shaft bearing is a tapered roller bearing. The main shaft bearing bears the radial and axial loads generated during the rotation of the main shaft 4 and ensures the stable operation of the main shaft 4.

[0099] The first oil injection nozzle 43 is arranged on the main shaft top cover and facilitates the addition of lubricating oil to the main shaft bearing from the outside by the operator.

[0100] The first oil injection channel is arranged on the main shaft top cover and connects the first oil injection nozzle 43 and the main shaft bearing. High-temperature lubricating grease is added through the oil injection nozzle to prevent the bearing from overheating.

[0101] The box body 2 is provided with a main shaft bottom cover 49 for sealing the lower part of the main shaft 4. A skeleton oil seal is arranged between the main shaft bottom cover and the main shaft 4. A first tapered roller bearing 48 and a first roller bearing 47 are arranged between the lower part of the box body 2 and the main shaft 4. The roller bearing is arranged above the tapered roller bearing, and a skeleton oil seal is arranged above the roller bearing.

[0102] Optionally, the gearbox further comprises: a first water injection channel, a mandrel 5, a water connector housing 63, a water connector 6, a water seal gland 61, a water seal 64, and a spring 62.

[0103] The first water injection channel is arranged on the main shaft 4. The main shaft 4 is a hollow steel pipe, and the first water injection channel is a pipeline in the middle of the main shaft 4. The first water injection channel is arranged on the main shaft 4, and the design purpose is to introduce water from the main shaft 4 to the drill pipe and drill bit to facilitate drilling.

[0104] The mandrel 5 is coaxially arranged with the main shaft 4, rotates with the main shaft 4 and is in airtight connection, and is internally provided with a second water injection channel communicated with the first water injection channel; an O-ring is arranged between the mandrel 5 and the main shaft 4.

[0105] The water connector shell 63 is sleeved on the main shaft 4 and is connected with the main shaft top cover 42;

[0106] The water pipe connector 6 is sleeved on the upper end of the mandrel 5; an O-ring is arranged between the water pipe connector 6 and the mandrel 5.

[0107] The water seal gland 61 is arranged between the water pipe connector 6 and the water connector shell 63, and is movably connected with the water pipe connector 6 at the upper end and with the water connector shell 63 at the lower end;

[0108] The water seal 64 is arranged between the mandrel 5, the water pipe connector 6 and the water seal gland 61;

[0109] The spring 62 is arranged between the water seal gland 61 and the water connector shell 63. The spring 62 can ensure that the water seal 64 maintains sufficient compression force during long-term use, thereby maintaining good sealing effect. At the same time, it can also compensate for the size changes caused by temperature changes or component wear.

[0110] Optionally, a third skeleton oil seal is arranged between the water connector shell 63 and the main shaft 4.

[0111] Optionally, the gearbox further comprises a transmission shaft top cover 32, a transmission shaft wear sleeve 34, an oil seal fixing cover 35, a fourth skeleton oil seal 36, a transmission shaft bearing 33, a second oil injection nozzle 31 and a second oil injection channel.

[0112] The transmission shaft top cover is fixed on the box body 2 and is used for sealing the upper end of the transmission shaft 3 and serving as an upper end sealing member of the lubricating system;

[0113] The transmission shaft wear sleeve is sleeved on the transmission shaft 3;

[0114] The oil seal fixing cover 35 is arranged between the transmission shaft top cover and the transmission shaft wear sleeve;

[0115] The fourth skeleton oil seal 36 is arranged between the transmission shaft wear sleeve and the oil seal fixing cover 35;

[0116] The transmission shaft bearing is mounted on the transmission shaft 3 and is arranged above the fourth skeleton oil seal 36;

[0117] The second oil injection nozzle 31 is arranged on the transmission shaft top cover;

[0118] The second oil injection channel is arranged on the transmission shaft top cover and is communicated with the second oil injection nozzle 31 and the transmission shaft bearing.

[0119] Optionally, the transmission shaft 3 is provided with an axial sliding rail for supporting the axial movement of the gear shifting gear 7.

[0120] The bottom of the transmission shaft 3 is sealed by a transmission shaft bottom cover, and an O-ring is arranged between the transmission shaft bottom cover and the box 2.

[0121] A roller bearing is arranged between the bottom of the transmission shaft 3 and the box 2, a bearing spacer is arranged between the roller bearing and a bearing in the speed increasing gear 10, and a skeleton oil seal is arranged between the bearing spacer and the box 2.

[0122] The spherical bearing in the speed increasing gear 10 is fixed in the speed increasing gear 10 by an inner snap spring.

[0123] The embodiment provides a power assembly, the gearbox in any of the above embodiments, and one end of the transmission shaft 3 is connected with the hydraulic piston motor or the cycloidal motor 1. One end of the transmission shaft 3 is connected with the hydraulic piston motor or the cycloidal motor 1 through appropriate connecting devices (such as shaft couplings, flanges, groove shafts, etc.). It is ensured that the power is stably and efficiently transmitted from the motor to the gearbox, and then the whole power assembly is driven to work.

[0124] When the hydraulic piston motor or the cycloidal motor 1 receives power provided by an external power source (such as a hydraulic pump), the rotary torque generated by the motor is transmitted to the transmission shaft 3 through the connecting device. The transmission shaft 3 transmits the torque to the inside of the gearbox, and after the speed change and distribution of the gearbox, finally drives the drill rod or other working parts of the drilling machine to work.

[0125] When the hydraulic piston motor or the cycloidal motor 1 is connected with the gearbox box 2 through bolts or a motor support.

[0126] The embodiment provides a drilling machine, which comprises the above power assembly, the power assembly is a core component of the drilling machine, and is responsible for converting the power provided by an external power source into rotary or impact power required for drilling.

[0127] The above description and drawings fully illustrate the embodiments of the present disclosure, so that those skilled in the art can practice them. Other embodiments can include structural and other changes. The embodiments only represent possible changes. Unless explicitly required, individual components and functions are optional, and the order of operations can be changed. Some parts and features of some embodiments can be included in or replace parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A gearbox, characterized in that The gearbox comprises: a box body for accommodating and protecting internal components of the gearbox; a transmission shaft arranged at least partially rotatably in the box body, one end of which is connected to a power input mechanism; a main shaft arranged at least partially rotatably in the box body, one end of which is used for outputting power; a shift gear arranged on the transmission shaft and capable of sliding axially along the transmission shaft; a high-speed gear arranged rotatably on the transmission shaft and spaced apart from the shift gear, the side of the high-speed gear facing the shift gear being provided with a tooth groove for engaging and transmitting power with the shift gear; a reduction gear arranged on the main shaft and capable of engaging with the shift gear; a speed-up gear arranged on the main shaft and engaging with the high-speed gear; a neutral gear arranged on the main shaft and located between the reduction gear and the speed-up gear.

2. The gearbox according to claim 1, characterized in that Further comprising: a shift fork slidingly assembled with the shift gear; a shift fork arm connected to the shift fork; a shift fork shaft rotatably connected to the box body, one end of which penetrates into the inside of the box body and is connected to the shift fork arm, and the other end of which penetrates to the outside of the box body; a gearshift handle located outside the gearbox and hingedly connected to the shift fork shaft; a gearshift positioning groove arranged on the box body; a gearshift positioning plug arranged on the gearshift handle and selectively matched with the gearshift positioning groove.

3. The gearbox of claim 2, wherein, The shift gear is provided with an annular groove, and the annular groove is capable of being inserted into the shift fork.

4. The gearbox of claim 1, wherein, Further comprising: a main shaft top cover fixed to the box body and used for closing the upper end of the main shaft and serving as an upper end sealing member of a lubricating system; a first skeleton oil seal arranged between the main shaft top cover and the main shaft; a second skeleton oil seal arranged between the main shaft and the box body; a main shaft bearing installed on the main shaft and located between the first skeleton oil seal and the second skeleton oil seal; a first oil injection nozzle arranged on the main shaft top cover; a first oil injection channel arranged on the main shaft top cover and connecting the first oil injection nozzle and the main shaft bearing.

5. The gearbox of claim 1, wherein, Further comprising: a first water injection channel arranged on the main shaft; a mandrel coaxially arranged with the main shaft, rotatably and tightly connected to the main shaft, and internally provided with a second water injection channel connected to the first water injection channel; a water connector shell sleeved on the main shaft and connected to the main shaft top cover; a water connector sleeved on the upper end of the mandrel; a water seal cover arranged between the water connector and the water connector shell, the upper end of which is connected to the water connector, and the lower end of which is movably connected to the water connector shell; a water seal arranged between the mandrel, the water connector and the water seal cover; a spring arranged between the water seal cover and the water connector shell.

6. The gearbox of claim 5, wherein, A third skeleton oil seal is arranged between the water connector shell and the main shaft.

7. The gearbox of claim 1, wherein, Further comprising: a transmission shaft top cover fixed to the box body and used for closing the upper end of the transmission shaft and serving as an upper end sealing member of a lubricating system; a transmission shaft wear-resistant sleeve sleeved on the transmission shaft; an oil seal fixing cover arranged between the transmission shaft top cover and the transmission shaft wear-resistant sleeve; a fourth skeleton oil seal arranged between the transmission shaft wear-resistant sleeve and the oil seal fixing cover; a transmission shaft bearing installed on the transmission shaft and located above the fourth skeleton oil seal; a second oil injection nozzle arranged on the transmission shaft top cover; a second oil injection channel arranged on the transmission shaft top cover and connecting the second oil injection nozzle and the transmission shaft bearing.

8. The gearbox of claim 1, wherein, The transmission shaft is provided with an axial sliding track for supporting the axial movement of the shift gear.

9. A powertrain characterized by, The gearbox comprises the gearbox according to any one of claims 1 to 8, and one end of the transmission shaft is connected to a hydraulic ram motor or a cycloid motor.

10. A drilling machine characterized in that, The power assembly comprises the gearbox according to claim 9.

Images