A torque increasing device, a power head and a rotary drilling rig

Abstract

The present invention provides a torque increasing device, a power head and a rotary drilling rig, which relate to the field of construction machinery. The torque increasing device includes a housing frame and a speed reduction mechanism disposed in the housing frame. In the speed reduction mechanism, a first power shaft and a second power shaft are coaxially arranged. A transmission gear is installed in the accommodating cavity between the first power shaft and the second power shaft. The transmission gear is in a first-stage external meshing with a first transmission tooth and in a first-stage internal meshing with a second transmission tooth. The power head inputs a first torque to the first power shaft, and the speed is reduced and the torque is increased through the first-stage external meshing and the first-stage internal meshing. The second power shaft outputs a second torque in the reverse direction. By installing this torque increasing device on the power head body and using it in a rotary drilling rig, the second torque meets the torque required for lowering the casing. At the same time, the acting forces of the first torque and the second torque on the mast and the luffing are offset, reducing the torque received by the mast and the luffing hinge point, and improving the overall stability and safety of the rotary drilling rig.

Description

Technical Field

[0001] The invention relates to the field of engineering machinery, and in particular to a torque increasing device, a power head and a rotary drilling rig. Background Art

[0002] A rotary drilling rig is a construction machine suitable for drilling holes in building foundation projects. It is widely used in municipal construction, highway bridges, high-rise buildings and other foundation construction projects. It can be used with different drilling tools to drill holes in dry (short spiral), wet (rotary bucket) and rock formations. The rotary drilling rig has the characteristics of high power, high output torque, high axial pressure, flexibility, high construction efficiency and multi-function.

[0003] The rotary drilling rig needs to lower the casing before the pile hole is constructed. According to different geological conditions, the casing should be pre-buried reasonably. If the drilling is carried out on land, the casing is usually buried by digging a pit. Long casing or full casing must be used in silty clay that is easy to shrink, loose miscellaneous fill strata and sand layers that cause hole collapse, and severely permeable strata. At this time, the power head can be used to rotate forward and reverse and additional pressure equipment can be used to pressurize the casing to cut into the soil, shortening the time for digging a pit to bury the casing. However, in actual operation, this method not only increases the torque required for lowering the casing, but also increases the torque on the mast and the variable amplitude hinge. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a torque increasing device, which adopts the method of reverse deceleration and torque increasing to provide the torque required for lowering casing and reduce the torque applied to the mast and the luffing hinge.

[0005] The present invention also provides a power head equipped with the above-mentioned torque increasing device, which adopts the method of reverse speed reduction and torque increasing to solve the above-mentioned technical problem.

[0006] The present invention also provides a rotary drilling rig equipped with the above-mentioned power head, which provides the torque required for lowering casing, reduces the torque applied to the mast and the amplitude change hinge, and improves the stability of the whole machine.

[0007] To achieve this purpose, the present invention provides a torque increasing device, which is applied to a rotary drilling rig, wherein the torque increasing device includes a housing frame and a reduction mechanism; the reduction mechanism is arranged in the housing frame, and the reduction mechanism includes:

[0008] A first power shaft, which is a hollow structure, a first transmission tooth is provided on the outer wall of the first power shaft, and the first power shaft is rotatably mounted on the housing frame;

[0009] The second power shaft, which is of a hollow structure, has a second transmission gear provided on the inner wall thereof. The second power shaft is rotatably installed in the housing frame and is coaxially arranged with the first power shaft. An accommodation cavity is formed between the first transmission gear and the second transmission gear; and

[0010] An intermediate transmission assembly, which includes a plurality of transmission gears. The plurality of transmission gears are arranged in the accommodation cavity and are respectively rotatably installed on the housing frame. The transmission gears are externally meshed with the first transmission gear and internally meshed with the second transmission gear.

[0011] Preferably, the intermediate transmission assembly further includes a gear rack, which is fixedly installed on the housing frame, and the transmission gears are rotatably installed in the gear rack.

[0012] Furthermore, shafts are respectively provided at both ends of the transmission gear, and the shafts are rotatably assembled in the gear rack through bearings; the transmission gear is assembled through bearings, reducing frictional resistance and improving the transmission efficiency.

[0013] Preferably, the upper end and / or the lower end of the second power shaft are / is rotatably installed with the housing frame through a slewing support; the slewing support provides the required slewing motion for the second power shaft member and simultaneously bears the axial force, radial force, etc. of the second power shaft.

[0014] Preferably, the first transmission gear, the second transmission gear and the transmission gears are provided as straight teeth or helical teeth, and the transmission gears are respectively meshed with the first transmission gear and the second transmission gear.

[0015] Preferably, an input connecting member is installed at one end of the first power shaft away from the housing frame, and the input connecting member is connected to the input end; the input connecting member is used to connect with the power head on a rotary drilling rig.

[0016] Preferably, an output connecting member is installed at the lower end of the second power shaft. The output connecting member extends away from the second power shaft outside the housing frame, and the output connecting member is rotatably assembled with the housing frame; the output connecting member is used to connect a casing to output high torque.

[0017] Furthermore, the output connecting member is a hollow-structured ring member, and the inner diameter of the output connecting member is greater than or equal to the inner diameter of the first power shaft; to ensure that the drill pipe passes smoothly through the output connecting member and the first power shaft.

[0018] The present invention also provides a power head, which is applied to a rotary drilling rig. The power head includes a power head body, and any one of the above-mentioned torque increasing devices is installed on the power head body.

[0019] The present invention also provides a rotary drilling rig, which includes a rotary drilling rig body, and the above-mentioned power head is installed on the rotary drilling rig body.

[0020] Advantages of the present invention:

[0021] A torque increasing device provided by the present invention, a speed reduction mechanism is arranged in a housing frame. The speed reduction mechanism includes a first power shaft, a second power shaft and an intermediate transmission assembly. The intermediate transmission assembly includes a plurality of transmission gears. The first power shaft and the second power shaft are coaxially arranged. The transmission gears are installed in a receiving cavity between the first power shaft and the second power shaft. The transmission gear is in a first-stage external engagement with the first transmission gear, and the transmission gear is in a first-stage internal engagement with the second transmission gear. The power head inputs a first torque to the first power shaft, and through the first-stage external engagement and first-stage internal engagement of the transmission gears, the speed is reduced and the torque is increased to obtain a reverse second torque. Then, the second power shaft outputs the second torque. The second torque meets the torque required for lowering the casing. At the same time, the direction of the second torque is opposite to that of the first torque. Thus, the acting forces of the first torque and the second torque on the mast and the luffing are offset, reducing the torque received by the mast and the luffing hinge point.

[0022] A power head provided by the present invention is provided with the above-mentioned torque increasing device on the power head body, so that the power head outputs a reverse second torque to meet the torque required for lowering the casing. At the same time, the acting force of the power head on the mast and the luffing is reduced, and the torque received by the mast and the luffing hinge point is reduced.

[0023] A rotary drilling rig provided by the present invention is provided with the above-mentioned power head on the rotary drilling rig body, providing the torque required for lowering the casing. At the same time, the acting force of the power head on the mast and the luffing is reduced, and the torque received by the mast and the luffing hinge point is reduced, so as to improve the overall stability and safety of the rotary drilling rig. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 Shows a schematic structural diagram of a torque increasing device provided by the present application;

[0026] Figure 2 Shows the present application Figure 1 The top view of the torque increasing device in;

[0027] Figure 3 shows a cross-sectional view taken along the A-A direction of the present application Figure 2 in the present application;

[0028] Figure 4 shows a schematic diagram of a partially enlarged structure at position B in the present application Figure 3 in the present application;

[0029] Figure 5 shows a schematic installation diagram of the torque increasing device provided by the present application.

[0030] Description of main component symbols:

[0031] 1 - First power shaft; 2 - Housing frame; 3 - Second power shaft; 4 - Intermediate transmission assembly; 10 - Input connecting member; 11 - Input shaft member; 11a - Input end; 11b - First transmission end; 12 - Third bearing; 20 - Upper end cover; 20a - First through hole; 21 - Lower end cover; 21a - Second through hole; 22 - Annular side wall; 23 - Clamping seat; 30 - Output shaft member; 30a - Second transmission end; 30b - Output end; 31 - Output connecting member; 32 - First bearing; 33 - Slewing support; 40 - Transmission gear; 40a - External meshing; 40b - Internal meshing; 41 - Gear frame; 42 - Second bearing; 43 - Rotating shaft; 100 - Torque increasing device; 200 - Power head; 300 - Mast; 400 - Casing. Detailed implementation manners

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 should not be construed as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0035] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "joined", "fixed", etc. 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 components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or 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 "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] Embodiment 1

[0038] Please refer to Figure 1 、 Figure 2 and Figure 5 As shown in, a torque increasing device 100 provided in this embodiment is applied to a rotary drilling rig. The torque increasing device 100 includes: a housing frame 2 and a speed reducing mechanism. The housing frame 2 is arranged as a cylindrical housing frame 2, which has an upper end cover 20 and an opposite lower end cover 21 and an annular side wall 22 connecting the upper end cover 20 and the lower end cover 21. The annular side wall 22 extends in one direction with a card seat 23 for sliding installation. The card seat 23 is slidably assembled with a mast 300 in the rotary drilling rig, so that the housing frame 2 slides up and down on the mast 300 along with the power head 200. The speed reducing mechanism is arranged in the housing frame 2, and the speed reducing mechanism realizes speed reduction and torque increase and outputs a large reverse torque.

[0039] Referring further to Figure 3, the reduction mechanism includes: a first power shaft 1, a second power shaft 3, and an intermediate transmission assembly 4 disposed between the first power shaft 1 and the second power shaft 3. The first power shaft 1 inputs a first torque and transmits it to the second power shaft 3 through the intermediate transmission assembly 4. The second power shaft 3 outputs a second torque in the same direction as the first torque, and the second torque is greater than the first torque to meet the torque required when the rotary drilling rig is driving the casing 400, improve work efficiency, ensure the compaction of the buried casing 400, shorten the digging and burying time, and improve the hole-forming efficiency.

[0040] Specifically, the first power shaft 1 is disposed in the housing frame 2. The first power shaft 1 includes an input shaft member 11 with a hollow structure and an input connector 10. The hollow structure of the input shaft member 11 is to ensure that the drill pipe can pass through smoothly. The input shaft member 11 is rotatably installed in the housing frame 2.

[0041] Refer to Figure 3 and Figure 4 , wherein, the input shaft member 11 includes: an input end 11a and an opposite first transmission end 11b. The first transmission end 11b is disposed inside the housing frame 2, and a first transmission gear is provided on the outer wall of the first transmission end. The input end 11a extends outside the housing frame 2, that is, extends outside the housing frame 2 towards the upper end cover 20. At the same time, a first through hole 20a is provided on the upper end cover 20, and the input end 11a is received in the first through hole 20a.

[0042] The input connector 10 is also of a hollow structure, and its purpose is also to ensure that the drill pipe can pass through smoothly. The input connector 10 is installed on the input end 11a. The input connector 10 is used to connect with the power head 200 on the rotary drilling rig, and its function is to transmit the torque output by the power head 200 to the output shaft member 30.

[0043] In some specific embodiments, the first transmission gear and the first transmission end 11b are independent parts, and the first transmission gear is welded or key-connected to the first transmission end 11b.

[0044] In this embodiment, the first transmission gear and the first transmission end 11b are integrally provided, that is, the first transmission gear is directly formed by machining on the first transmission end 11b, and the power input shaft member 11 is a gear shaft.

[0045] Refer to Figure 3 and Figure 4Specifically, the second power shaft 3 is arranged in the housing frame 2, and the second power shaft 3 includes: an output shaft 30 with a hollow structure and an output connecting member 31. The hollow structure of the output shaft 30 is to ensure that the drill rod can pass through the setting smoothly. The output shaft 30 is rotatably installed in the housing frame 2, and the output shaft 30 is sleeved on the input shaft 11 and is coaxially arranged with the input shaft 11.

[0046] In some specific embodiments, the upper end of the input shaft 11 is rotatably mounted with the housing frame 2 via a swivel support 33; the swivel support 33 is configured to provide the output shaft 30 with the required swivel motion while bearing the axial force, radial force, etc. of the output shaft 30.

[0047] In some specific embodiments, the lower end of the input shaft 11 is rotatably mounted with the housing frame 2 via a swivel support 33; the swivel support 33 is configured to provide the output shaft 30 with the required swivel motion while bearing the axial force, radial force, etc. of the output shaft 30.

[0048] In some specific embodiments, the upper and lower ends of the input shaft 11 are rotatably mounted with the housing frame 2 via a swivel support 33; the swivel support 33 is configured to provide the output shaft 30 with the required swivel motion while bearing the axial force, radial force, etc. of the output shaft 30.

[0049] In an embodiment in which a rotary support member 33 is provided at the upper end of the input shaft member 11, the output shaft member 30 includes: a second transmission end 30a and an output end 30b, a second transmission tooth is provided on the inner wall of the second transmission end 30a, and the first transmission tooth is provided corresponding to the second transmission tooth, and an accommodating cavity (not shown) is formed between the first transmission tooth and the second transmission tooth, and the output end 30b is located on the side of the output shaft away from the input end 11a, that is, the output end 30b faces the lower end cover 21.

[0050] See also Figure 3 and Figure 4 The output connector 31 is installed at the output end 30b, and the output connector 31 extends outside the housing frame 2 in a direction away from the input end 11a. It can be understood that the output connector 31 passes through the lower end cover 21, and the lower end cover 21 is provided with a second through hole 21a, and the second through hole 21a accommodates the output connector 31. The output connector 31 is rotatably assembled with the lower end cover 21 through a first bearing 32; the output connector 31 is used to connect the casing 400 to output the second torque.

[0051] Further, in this embodiment, the output connecting member 31 is an annular member with a hollow structure, and the second transmission end 30a is installed in the output connecting member 31 through a third bearing 12. The inner diameter of the output connecting member 31 is greater than or equal to the inner diameter of the input shaft member 11. In this embodiment, the inner diameter of the output connecting member 31 is greater than the inner diameter of the input shaft member 11 to ensure that the drill pipe can pass through the output connecting member 31 and the input shaft smoothly.

[0052] In some specific embodiments, the second transmission gear and the second transmission end 30a are independent parts, and the second transmission gear is welded or key-connected to the inner wall of the second transmission end 30a.

[0053] In this embodiment, the second transmission gear and the second transmission end 30a are integrally provided, that is, the second transmission gear is directly formed by machining on the inner wall of the second transmission end 30a, and the power transmission shaft member is an internal gear ring shaft.

[0054] Refer to Figure 3 and Figure 4 , specifically, the intermediate transmission assembly 4 is arranged between the input shaft member 11 and the output shaft member 30. The intermediate transmission assembly 4 includes: a plurality of transmission gears 40, and the plurality of transmission gears 40 are arranged in the accommodation cavity (not shown in the figure) and are rotatably installed on the housing frame 2. The transmission gears 40 are respectively meshed with the first transmission gear and the second transmission gear. The first transmission gear drives the second transmission gear to rotate in the reverse direction and decelerate through the transmission gears 40. It can be understood that the transmission gear 40 and the first transmission gear are in a first-stage external meshing 40a, and the transmission gear 40 and the second transmission gear are in a first-stage internal meshing 40b. After transmission through the first-stage external meshing 40a and the first-stage internal meshing 40b, the rotation direction of the second transmission gear is opposite to that of the first transmission gear, and speed reduction and torque increase are achieved. Therefore, the second torque is output by the output connecting member 31.

[0055] The number of the transmission gears 40 can be selected as three, four, five, six, etc., as long as the axes of the plurality of transmission gears 40 can be arranged around a virtual circle without interfering with each other. The specific selection needs to be comprehensively considered according to the output torque and the size of the casing 400. This embodiment is only an example and does not limit the protection scope.

[0056] In this embodiment, the intermediate transmission assembly 4 further includes a plurality of gear racks 41. The number of the gear racks 41 is the same as the number of the transmission gears 40. Each transmission gear 40 is installed in the corresponding gear rack 41. One end of the gear rack 41 is fixedly installed on the upper end cover 20 of the housing frame 2, and the other end is also placed in the accommodation cavity (not shown in the figure).

[0057] In some specific embodiments, the transmission gear 40 is designed as an integral gear shaft structure. Shafts 43 extend from both ends of the transmission gear 40, and the shafts 43 are respectively assembled in the gear bracket 41 through second bearings 42.

[0058] In some specific embodiments, the transmission gear 40 is designed as a structure in which the gear and the shaft 43 are assembled by keys. The shafts 43 extend from both ends of the transmission gear 40 and are respectively assembled in the gear bracket 41 through second bearings 42.

[0059] In the embodiment where the transmission gear 40 is designed as an integral gear shaft structure, the first transmission gear, the second transmission gear, and the transmission gear 40 are provided with straight teeth, and the transmission gear 40 meshes with the first transmission gear and the second transmission gear respectively.

[0060] In some specific embodiments, the first transmission gear, the second transmission gear, and the transmission gear 40 are provided with helical teeth.

[0061] Referring to Figures 1 to 5 , a torque increasing device 100 provided in this embodiment is implemented as follows: The power head 200 inputs a first torque to the input shaft member 11. Through the first-stage external meshing 40a between the first transmission gear and the transmission gear 40, and the first-stage internal meshing 40b between the transmission gear 40 and the second transmission gear, speed reduction and torque increase are achieved. At the same time, the rotation direction of the second transmission gear is opposite to that of the first transmission gear. Therefore, a second reversed torque after torque increase is output by the output connecting member 31. The second torque meets the torque required for driving the lower casing 400. At the same time, the direction of the second torque is opposite to that of the first torque. Thus, the acting forces of the first torque and the second torque on the mast 300 and the luffing are offset, reducing the torque received by the mast 300 and the luffing hinge point.

[0062] Furthermore, the second torque output by the torque increasing device 100 provided in this embodiment is greater than the original output first torque. Therefore, when assembled on the power head 200 for use, it can meet the installation of casings 400 with larger sizes and greater depths, adapting to the requirements of most projects. Moreover, there is no need to add additional equipment, such as a full rotary drilling rig, a pipe ramming machine, or a crawler crane equipped with a vibratory hammer for full casing construction, reducing equipment cost investment and reducing the labor intensity of workers. This embodiment is simple to disassemble and assemble, greatly improving construction efficiency, improving the working environment, saving cost investment, and having good economic benefits.

[0063] Embodiment 2

[0064] Please refer to Figure 3 and Figure 4, the torque increasing device 100 provided in this embodiment is an improvement based on Embodiment 1. The main improvement lies in the gear frame 41, and other structural solutions remain unchanged, following Embodiment 1. The following is a detailed description of the improvement points.

[0065] Specifically: In this embodiment, the intermediate transmission assembly 4 further includes a gear frame 41. The gear frame 41 is provided as an integral type, that is, an integral structure. Each transmission gear 40 is rotatably installed in the gear frame 41. One end of the gear frame 41 is fixedly installed on the upper cover 20 of the housing frame 2, and the other end is also placed in the accommodation cavity (not shown in the figure).

[0066] In some specific embodiments, the transmission gear 40 is designed as an integral gear shaft structure. Shafts 43 extend from both ends of the transmission gear 40 respectively, and the shafts 43 are respectively assembled in the gear frame 41 through second bearings 42.

[0067] In some specific embodiments, the transmission gear 40 is designed as a structure in which the gear and the shaft 43 are assembled by a key. The shafts 43 extend from both ends of the transmission gear 40 and are respectively assembled in the gear frame 41 through second bearings 42.

[0068] In the embodiment where the transmission gear 40 is designed as an integral gear shaft structure, the first transmission gear, the second transmission gear, and the transmission gear 40 are provided with straight teeth, and the transmission gear 40 meshes with the first transmission gear and the second transmission gear respectively.

[0069] In some specific embodiments, the first transmission gear, the second transmission gear, and the transmission gear 40 are provided with helical teeth.

[0070] The torque increasing device 100 provided in this embodiment has the same principle as that in Embodiment 1, and will not be elaborated here.

[0071] Embodiment 3

[0072] Refer to Figures 1 to 5 , this embodiment provides a power head 200, which is applied to a rotary drilling rig. The power head 200 includes a power head body, and the torque increasing device 100 provided in the above Embodiment 1 or Embodiment 2 is installed on the power head body.

[0073] The power head 200 outputs a first torque. After being decelerated and torque-increased by the above-mentioned torque-increasing device 100, it outputs a second torque with the opposite direction. This second torque meets the torque required for driving the casing 400. Meanwhile, the acting forces of the first torque and the second torque on the mast 300 and the luffing mechanism cancel each other out, greatly reducing the acting force of the power head 200 on the mast 300 and the luffing mechanism, and reducing the torque received by the hinge points of the mast 300 and the luffing mechanism, so as to improve the overall stability and safety of the rotary drilling rig.

[0074] The second torque output by the power head 200 provided in this embodiment is greater than the original output first torque. Therefore, it can meet the installation of casings 400 with larger sizes and greater depths, and adapt to most engineering requirements. Moreover, there is no need to add additional equipment, such as a full-rotation drilling rig, a pipe ramming machine, or a crawler crane equipped with a vibratory hammer for full-casing construction, reducing equipment cost investment and reducing the labor intensity of workers. This embodiment is simple to disassemble and assemble, greatly improving the construction efficiency, improving the working environment, saving cost investment, and having good economic benefits.

[0075] Embodiment 4

[0076] Refer to Figures 1 to 5 This embodiment provides a rotary drilling rig. The rotary drilling rig includes a rotary drilling rig body. The rotary drilling rig body is connected with a mast 300 through a luffing mechanism. The power head 200 provided in Embodiment 3 is installed on the mast 300. By outputting the second torque through the above-mentioned power head 200, the required torque for the casing 400 is provided. Meanwhile, the acting force of the power head 200 on the mast 300 and the luffing mechanism is reduced, and the torque received by the hinge points of the mast 300 and the luffing mechanism is reduced, so as to improve the overall stability and safety of the rotary drilling rig.

[0077] For the rotary drilling rig provided in this embodiment, the second torque output after installing the above-mentioned power head 200 is greater. Therefore, it can meet the installation of casings 400 with larger sizes and greater depths, and adapt to most engineering requirements. Moreover, there is no need to add additional equipment, such as a full-rotation drilling rig, a pipe ramming machine, or a crawler crane equipped with a vibratory hammer for full-casing construction, reducing equipment cost investment and reducing the labor intensity of workers. This embodiment is simple to disassemble and assemble, greatly improving the construction efficiency, improving the working environment, saving cost investment, and having good economic benefits.

[0078] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0079] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A torque increasing device is applied to a rotary drilling rig, and is characterized in that, The torque increasing device includes a housing frame and a speed reduction mechanism; The speed reduction mechanism is arranged in the housing frame, and the speed reduction mechanism includes: A first power shaft, which is of a hollow structure. A first transmission gear is provided on the outer wall of the first power shaft. The first power shaft is rotatably installed on the housing frame; A second power shaft, which is of a hollow structure. A second transmission gear is provided on the inner wall of the second power shaft. The second power shaft is rotatably installed in the housing frame and is coaxially arranged with the first power shaft. An accommodation cavity is formed between the first transmission gear and the second transmission gear; and An intermediate transmission assembly, which includes a gear frame and a plurality of transmission gears. The gear frame is fixedly installed on the housing frame. The plurality of transmission gears are arranged in the accommodation cavity and are respectively rotatably installed in the gear frame. The transmission gears are externally meshed with the first transmission gear and internally meshed with the second transmission gear; Wherein, an output connecting piece is installed at the lower end of the second power shaft. The output connecting piece extends away from the second power shaft outside the housing frame. The output connecting piece is rotationally assembled with the housing frame; the direction of the first torque input by the first power shaft is opposite to the direction of the second torque output by the second power shaft.

2. The torque increasing device according to claim 1, wherein Shafts are respectively provided at both ends of the transmission gear. The shafts are rotationally assembled in the gear frame through bearings.

3. The torque increasing device according to claim 1, wherein The upper end and / or the lower end of the second power shaft is rotationally installed with the housing frame through a slewing support.

4. The torque increasing device according to claim 1, characterized in that, The first transmission gear, the second transmission gear and the transmission gears are set as straight teeth or helical teeth, and the transmission gears are respectively meshed with the first transmission gear and the second transmission gear.

5. The torque increasing device according to any one of claims 1-4, characterized in that, An input connecting piece is installed at one end of the first power shaft away from the housing frame.

6. The torque increasing device according to any one of claims 1-4, characterized in that, The output connecting piece is a hollow annular piece, and the inner diameter of the output connecting piece is greater than or equal to the inner diameter of the first power shaft.

7. A power head, which is applied to a rotary drilling rig, is characterized in that, The power head includes a power head body, and the torque increasing device according to any one of claims 1-6 is installed on the power head body.

8. A rotary drilling rig, characterized in that, It includes a rotary drilling rig body, and the power head according to claim 7 is installed on the rotary drilling rig body.

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