Convergence differential speed reducer for rotary drilling rig power head and corresponding rotary drilling rig power head

Abstract

The present invention relates to a confluent differential speed reducer for a rotary drilling rig power head and a corresponding rotary drilling rig power head, wherein the confluent differential speed reducer comprises a main motor, at least one differential motor, a differential transmission mechanism and an output transmission mechanism corresponding to the number of the differential motors; the main motor is connected to the output transmission mechanism, and each of the differential motors is connected to the output transmission mechanism through the corresponding differential transmission mechanism; the rotary drilling rig power head including the speed reducer can choose whether to transmit the auxiliary power provided by the differential motor to the output transmission mechanism according to the actual working conditions. The confluent differential speed reducer for a rotary drilling rig power head and the corresponding rotary drilling rig power head adopting this structure can meet the working needs of different working conditions, effectively improve the construction efficiency, can easily meet the working needs of the rotary drilling rig, better protect the equipment, extend the service life of the core components, and achieve environmental protection and energy saving.

Description

Technical Field

[0001] The present invention relates to the field of machinery, in particular to the field of mechanical transmission, and specifically refers to a rotary drilling rig power head confluence differential speed reducer and a corresponding rotary drilling rig power head. Background Art

[0002] The construction of Qinghai-Tibet Railway kicked off the development of domestic rotary drilling rigs. The power head, one of the most critical executive components of rotary drilling rigs, has also experienced continuous improvement and perfection from surveying and mapping imitation to adapting to large-scale domestic construction projects. The power head reducer has also gone through two periods: from the beginning to around 2008, it imitated the use of imported two-speed planetary reducers and then single-speed planetary reducers, which has continued to this day. In addition, even if some large-scale imported rotary drilling rigs use the so-called three-speed planetary reducers, their reliability in actual application is also unsatisfactory. At the same time, they are difficult to maintain, have a long spare parts cycle, and are expensive. As a result, many users use two-speed or three-speed reducers as single-speed or directly replace them with single-speed reducers commonly used in China, and the original good design intentions are gone.

[0003] Due to the installation space and layout requirements of the rotary drilling rig power head, the required reducer must adopt a single-stage or two-stage planetary series transmission form. The power is input by a hydraulic motor. Its structure can be seen in Figure 1. The power head in Figure 1 is mainly composed of a sliding frame assembly 1, a hydraulic motor 2, a reducer 3, a buffer device 4, a connecting plate and a bracket 5, a power head box assembly 6, and a pressure plate assembly 7. There are three groups of motor reducers.

[0004] The hydraulic power station of rotary drilling rig usually outputs at constant power. The rated output torque is usually 6-10r / min, and the no-load output is 21-38r / min, which varies according to the size of the drilling rig. During the construction process, it is often difficult to unload the soil, especially once the sticky soil is squeezed tightly in the drill bit, the only way to unload the soil is to frequently rotate forward and reverse, and manipulate the drill rod to knock the power head back and forth to let the soil in the drill bit fall out; in addition, for strata with good geological conditions, a higher power head output speed is often required (output torque is not important), but because the power head reducer has a single fixed speed ratio, efficient operation cannot be achieved. On the contrary, when facing hard strata such as granite, which requires the maximum output torque of the power head (output speed is not important), it can only be carried out according to the system design requirements. It often takes a long time to drive a rock pile, and it consumes a lot of energy, such as fuel consumption and cutting teeth. This brings the following disadvantages:

[0005] 1. The weight of the drill rod, drill tool and the soil inside the drill tool ranges from more than ten tons to more than twenty tons, or even more, for medium and large rotary drilling rigs. Frequent forward and reverse rotations collide with the power head. The huge impact inertia causes irregular bidirectional impact loads on the power head and even the entire rotary drilling machine. First, the normal bearing clearance and gear meshing clearance of the power head are destroyed prematurely, and the rotation accuracy of the rotating components in the power head cannot be guaranteed, resulting in various failure forms such as vibration, noise, oil leakage and even broken teeth. Secondly, huge impact noise is generated during the construction process, which has a greater impact on urban construction, especially on the environment of urban construction projects;

[0006] 2. At present, the reducer of the rotary drilling power head is usually a single fixed speed ratio reducer. In order to increase the no-load speed of the rotary drilling power head, the motor setting parameters are adjusted irrationally to increase the light-load running speed of the motor. This simple artificial expansion of the torque-speed output characteristics of the power head is very limited and the output characteristics are very soft, which cannot meet the output requirements of the rotary drilling rig under different working conditions. As a result, the service life of the motor or reducer is shortened, and the maintenance and operation costs of the user are increased;

[0007] 3. Seriously affect the efficiency and progress of project construction and increase the cost of project construction. Summary of the invention

[0008] In order to overcome at least one of the above-mentioned disadvantages of the prior art, the present invention provides a rotary drilling rig power head confluence differential speed reducer with good performance and strong adaptability.

[0009] In order to achieve the above object, the rotary drilling rig power head confluence differential speed reducer of the present invention is as follows:

[0010] The main feature of the confluence differential speed reducer of the rotary drilling rig power head is that the confluence differential speed reducer comprises a main motor, at least one differential motor, a differential transmission mechanism corresponding in number to the differential motors, and an output transmission mechanism;

[0011] The main motor is connected to the output transmission mechanism, and each of the differential motors is connected to the output transmission mechanism through the corresponding differential transmission mechanism;

[0012] The main motor transmits the main power to the output transmission mechanism, and each of the differential motors selectively transmits the corresponding auxiliary power to the output transmission mechanism through the corresponding differential transmission mechanism.

[0013] Preferably, each of the differential transmission mechanisms comprises a differential input shaft, a clutch and a differential gear pair;

[0014] Each of the differential motors is connected to the output transmission mechanism in sequence through the corresponding differential input shaft, clutch, and differential gear pair;

[0015] By controlling the clutch, the corresponding auxiliary power provided by the differential motor is selectively transmitted to the output transmission mechanism.

[0016] More preferably, the output transmission mechanism comprises an input spline shaft, a first planetary assembly, a second planetary assembly and an output base;

[0017] The main motor is connected to the output base through the input spline shaft, the first planetary assembly, and the second planetary assembly in sequence;

[0018] Each of the differential transmission mechanisms is connected to the input spline shaft via the differential gear pair in the differential transmission mechanism.

[0019] Furthermore, the first planetary assembly includes a first-stage sun gear, a first-stage planetary gear and a differential ring gear;

[0020] The input spline shaft is connected to the second planetary assembly through the first-stage sun gear, the first-stage planetary gear and the first-stage ring gear in sequence.

[0021] Further, the second planetary assembly includes a second-stage sun gear, a second-stage planetary gear and a second-stage ring gear;

[0022] The first planetary assembly is connected to the output base via the second-stage sun gear, the second-stage planetary gear and the second-stage ring gear in sequence.

[0023] Preferably, when the reducer performs normal transmission, the main power is transmitted to the output transmission mechanism only through the main motor; and by controlling the differential transmission mechanism corresponding to each differential motor, the corresponding differential motor does not transmit the auxiliary power to the output transmission mechanism;

[0024] When the speed reducer performs differential transmission only through part of the differential motors, the main power is transmitted to the output transmission mechanism through the main motor; by controlling the differential transmission mechanisms corresponding to the differential motors providing the auxiliary power, each differential motor providing the auxiliary power transmits the auxiliary power to the output transmission mechanism, and by controlling the differential transmission mechanisms corresponding to the differential motors not providing the auxiliary power, each differential motor not providing the auxiliary power does not transmit the auxiliary power to the output transmission mechanism;

[0025] When the reducer performs differential transmission through all the differential motors, the main power is transmitted to the output transmission mechanism through the main motor; and by controlling the differential transmission mechanism corresponding to each of the differential motors, the corresponding differential motor transmits the auxiliary power to the output transmission mechanism.

[0026] Preferably, the main motor is an automatic variable motor.

[0027] The main feature of the rotary drilling rig power head is that the rotary drilling rig power head includes the above-mentioned rotary drilling rig power head confluence differential speed reducer.

[0028] The rotary drilling rig power head confluence differential speed reducer of the present invention comprises a main motor, at least one differential motor, a differential transmission mechanism corresponding in number to the differential motors, and an output transmission mechanism; the main motor is connected to the output transmission mechanism, and each differential motor is connected to the output transmission mechanism through the corresponding differential transmission mechanism; the rotary drilling rig power head including the speed reducer can choose whether to transmit the auxiliary power provided by the differential motor to the output transmission mechanism according to the actual working conditions. The rotary drilling rig power head confluence differential speed reducer of the present invention can make the rotary drilling rig meet the working needs of different working conditions, effectively improve the construction efficiency, easily meet the working needs of the rotary drilling rig, better protect the equipment, extend the service life of the core components, and achieve environmental protection and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1a It is a structural schematic diagram of a rotary drilling rig power head in the prior art.

[0030] Figure 1b It is a side view of a rotary drilling rig power head in the prior art.

[0031] Figure 1c It is a top view of a rotary drilling rig power head in the prior art.

[0032] Figure 2a It is a cross-sectional view of a converging differential speed reducer of a rotary drilling rig power head in one embodiment of the present invention.

[0033] Figure 2b for Figure 2a Schematic diagram of the structure of the main motor in the A direction.

[0034] Figure 2c for Figure 2a The transmission principle diagram of the confluence differential reducer of the rotary drilling rig power head.

[0035] Figure 3a It is a cross-sectional view of a converging differential speed reducer of a rotary drilling rig power head in one embodiment of the present invention.

[0036] Figure 3b for Figure 3a The transmission principle diagram of the confluence differential reducer of the rotary drilling rig power head.

[0037] Reference numerals

[0038] 1 Sliding frame assembly

[0039] 2 Hydraulic motor

[0040] 3 Reducer

[0041] 4 Buffer device

[0042] 5 Connecting plate and bracket

[0043] 6 Power head housing assembly

[0044] 7 Pressure plate assembly

[0045] 8 Differential motor

[0046] 9 Main motor

[0047] 10 Input spline shaft

[0048] 11 First stage sun gear

[0049] 12 First stage planetary gear

[0050] 13 Differential ring gear

[0051] 14 Second stage sun gear

[0052] 15 Second stage planetary gear

[0053] 16 Second stage ring gear

[0054] 17 Output base

[0055] 18 Differential gear pair

[0056] 19 Clutch

[0057] 20 Differential input shaft DETAILED DESCRIPTION

[0058] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0059] like Figures 2a to 3b As shown, the rotary drilling rig power head confluence differential speed reducer of the present invention comprises a main motor 9, at least one differential motor 8, a differential transmission mechanism and an output transmission mechanism corresponding in number to the differential motor 8;

[0060] The main motor 9 is connected to the output transmission mechanism, and each of the differential motors 8 is connected to the output transmission mechanism through the corresponding differential transmission mechanism;

[0061] The main motor 9 transmits the main power to the output transmission mechanism, and each of the differential motors 8 selectively transmits the corresponding auxiliary power to the output transmission mechanism through the corresponding differential transmission mechanism.

[0062] In this embodiment, each of the differential transmission mechanisms includes a differential input shaft 20, a clutch 19 and a differential gear pair 18;

[0063] Each of the differential motors 8 is connected to the output transmission mechanism through the corresponding differential input shaft 20, clutch 19, and differential gear pair 18 in sequence;

[0064] By controlling the clutch 19, the corresponding auxiliary power provided by the differential motor 8 is selectively transmitted to the output transmission mechanism. The clutch 19 can be controlled by a control valve so that the auxiliary motor can only rotate in the same direction as the main motor 9; when the auxiliary motor is started, the clutch 19 with a braking function must be opened in advance by the pilot control before the auxiliary motor can be started; in normal operation, the auxiliary motor is in a stopped state and the brake is in a braking state; the clutch 19 with a braking function has a large power transmission capacity of up to 600kW, which is suitable for heavy equipment.

[0065] The clutch 19 in this embodiment actually has a braking function and needs to overcome the corresponding counter torque under normal conditions, rather than a simple clutch function.

[0066] In this embodiment, the output transmission mechanism includes 10, a first planetary assembly, a second planetary assembly and an output base 17;

[0067] The main motor 9 is connected to the output base 17 through the 10, the first planetary assembly, and the second planetary assembly in sequence;

[0068] Each of the differential transmission mechanisms is connected to the 10 via the differential gear pair 18 in the differential transmission mechanism.

[0069] In this embodiment, the first planetary assembly includes a first-stage sun gear 11, a first-stage planetary gear 12 and a differential ring gear 13;

[0070] The 10 is connected to the second planetary assembly via the first-stage sun gear 11, the first-stage planetary gear 12 and the first-stage ring gear in sequence.

[0071] In this embodiment, the second planetary assembly includes a second-stage sun gear 14, a second-stage planetary gear 15 and a second-stage ring gear 16;

[0072] The first planetary assembly is connected to the output base 17 through the second-stage sun gear 14 , the second-stage planetary gear 15 and the second-stage ring gear 16 in sequence.

[0073] In this embodiment, when the reducer performs normal transmission, the main power is transmitted to the output transmission mechanism only through the main motor 9; and by controlling the differential transmission mechanism corresponding to each differential motor 8, the corresponding differential motor 8 does not transmit the auxiliary power to the output transmission mechanism;

[0074] When the speed reducer performs differential transmission only through part of the differential motors 8, the main power is transmitted to the output transmission mechanism through the main motor 9; by controlling the differential transmission mechanisms corresponding to the differential motors 8 providing auxiliary power, each differential motor 8 providing auxiliary power transmits the auxiliary power to the output transmission mechanism, and by controlling the differential transmission mechanisms corresponding to the differential motors 8 not providing auxiliary power, each differential motor 8 not providing auxiliary power does not transmit the auxiliary power to the output transmission mechanism;

[0075] When the reducer performs differential transmission through all the differential motors 8, the main power is transmitted to the output transmission mechanism through the main motor 9; and by controlling the differential transmission mechanism corresponding to each of the differential motors 8, the corresponding differential motor 8 transmits the auxiliary power to the output transmission mechanism.

[0076] In this embodiment, the main motor 9 is an automatic variable motor.

[0077] In one embodiment, the rotary drilling rig power head includes the above-mentioned rotary drilling rig power head confluence differential reducer.

[0078] The rotary drilling rig power head using the rotary drilling rig power head confluence differential speed reducer has a wide torque-speed output characteristic, which can meet the application conditions under different geological conditions and enable the equipment to operate efficiently under normal operating specifications, which is very meaningful for improving construction efficiency and reducing production costs. The rotary drilling rig power head confluence differential speed reducer and its control in this embodiment have the following characteristics:

[0079] 1. Under good geological conditions, the output torque of the power head is not important, but a higher output speed can significantly improve the construction efficiency, and a smaller reduction ratio is required at this time;

[0080] 2. Under general geological conditions, the output torque and speed of the power head can automatically match the corresponding drilling and soil excavation load;

[0081] 3. For hard formations, especially weakly weathered hard rock formations, the rotary drilling rig needs to have sufficient rated output torque to drive the appropriate cutting tool to break the rock, and the output speed is usually not important at this time;

[0082] 4. In any state, the rotary drilling rig can have a no-load output speed of 4-5 times the rated load. This not only greatly improves the construction efficiency, but also easily realizes the real rapid soil unloading function, while protecting the equipment and extending the service life of core components, it also achieves environmental protection and energy saving.

[0083] That is, the rotary drilling rig using the confluent differential reducer of the rotary drilling rig power head of the present invention can realize the confluent differential drive, and the speed ratio range of the reducer is determined according to the rated output parameters of the rotary drilling rig: the rated maximum and minimum output torque-speed characteristics. The best way to achieve this is to use the confluent differential drive confluent differential reducer of the rotary drilling rig power head. This can fully ensure that the output characteristics of the power head can meet the above requirements. Combined with the optimal control method of the motor, the output performance of the power head of the rotary drilling rig will leap to a higher level.

[0084] like Figures 2a to 2c As shown, in one embodiment, the reducer includes a differential motor 8 and a differential transmission mechanism.

[0085] In this embodiment, when the reducer performs normal transmission, the main power is transmitted to the output transmission mechanism only through the main motor 9; and by controlling the differential transmission mechanism, the differential motor 8 does not transmit the auxiliary power to the output transmission mechanism;

[0086] When the reducer performs differential transmission, the main power is transmitted to the output transmission mechanism through the main motor 9; and by controlling the differential transmission mechanism, the differential motor 8 transmits the auxiliary power to the output transmission mechanism.

[0087] from Figure 2a It can be seen that the rotary drilling rig power head confluent differential reducer in this embodiment includes a first-stage differential planetary - a first-stage sun gear 11, a first-stage planetary gear 12 and a differential ring gear 13, a first-stage fixed axis gear pair - a differential gear pair 18 and a first-stage conventional planetary - a second-stage sun gear 14, a second-stage planetary gear 15 and a second-stage ring gear 16;

[0088] from Figure 2c It can be seen that the rotary drilling rig power head converging differential speed reducer in this embodiment is input by two power flows, namely the main power provided by the main motor 9 and the auxiliary power provided by the differential motor 8;

[0089] The main motor 9 transmits the main force (i.e. the main power flow) to the first-stage sun gear 11 through 10;

[0090] Figure 2cAmong them, T1 is the input torque of the main motor 9, N1 is the input speed of the main motor 9, T2 is the input torque of the differential motor 8, N2 is the input speed of the differential motor 8, Za1 is the first-stage sun gear 11, Zg1 is the first-stage planetary gear 12, Zb1 is the differential ring gear 13, Za2 is the second-stage sun gear 14, zg2 is the second-stage planetary gear 15, Zb2 is the second-stage ring gear 16, and Z1 and Z2 are two gears in the differential gear pair 18 respectively.

[0091] Normal transmission:

[0092] The clutch 19 realizes the zero input of the differential motor 8. At this time, there is only one power flow input provided by the main motor 9, which is transmitted to the second-stage sun gear 14, the second-stage planet and the ring gear through the first-stage sun gear 11, the first-stage planet and the differential gear ring 13 (fixed state). The reducer is connected to the power head through its output base 17. The output of the reducer is composed of the output torque and speed of the second-stage planet, and the total speed ratio is composed of ordinary second-stage planets. As can be seen from Figure 2, the transmission ratio i of the reducer in this case is as follows:

[0093] i=i1×i2=(1+Zb1 / Za1)×(1+Zb2 / Za1),

[0094] Reducer output torque: Tout = T1 × i

[0095] Reducer output speed: Nout = N1 / i

[0096] Among them, i1 is equal to (1+Zb1 / Za1), i2 is equal to (1+Zb2 / Za1), Za1 is the number of teeth of the first-stage sun gear 11, Zb1 is the number of teeth of the differential ring gear 13, Zb2 is the number of teeth of the second-stage ring gear 16, T1 is the input torque of the main motor 9, and N1 is the input speed of the main motor 9.

[0097] Differential transmission:

[0098] In addition to the power flow (i.e. output torque T1 and input speed N1) input provided by the main motor 9, the reducer also provides power flow (i.e. output torque T2 and input speed N2) input through the differential motor 8 under the control of the clutch 19. At this time, the clutch 19 is open: through the differential gear pair 18 installed on the differential input shaft 20: gear Z1 and gear Z2 drive the differential gear ring 13, the power flow and the power flow of the main motor 9 are synthesized in the first-stage planetary transmission and input to the second-stage sun gear 14, and the second-stage planet and the second-stage gear ring 16 are output. At this time, the reducer output speed Nout can be obtained by deduction:

[0099] Nout=[N1 / i1+N2×Zb1 / (Za1+Zb1)Z2 / Z1] / i2;

[0100] The speed regulation part is the second half;

[0101] The final output torque Tout of the reducer:

[0102] Tout=-(T1×N1+T2×N2) / [N1 / i1+N2×Zb1 / (Za1+Zb1)Z2 / Z1]i2;

[0103] Wherein, i1 is equal to (1+Zb1 / Za1), i2 is equal to (1+Zb2 / Za1), T1 is the input torque of the main motor 9, N1 is the input speed of the main motor 9, T2 is the input torque of the differential motor 8, N2 is the input speed of the differential motor 8, Za1 is the number of teeth of the first-stage sun gear 11, Za2 is the number of teeth of the second-stage sun gear 14, Zb1 is the number of teeth of the differential ring gear 13, Zb2 is the number of teeth of the second-stage ring gear 16, Z1 is the number of teeth of the gear Z1, and Z2 is the number of teeth of the gear Z2;

[0104] It can be seen that when the differential motor 8 and the main motor 9 are input at the same time, the reducer can achieve a wider output torque and speed characteristic, which just meets the above requirements.

[0105] like Figure 3a and 3b As shown, the reducer comprises two differential motors 8 and two differential transmission mechanisms. The reducer is a multi-stage confluence differential drive rotary drilling rig power head confluence differential reducer.

[0106] The rotary drilling rig is a complete series of products and is under continuous development and improvement. In order to achieve excellent output characteristics of the key power head of the rotary drilling rig, the multi-stage confluence differential drive rotary drilling rig power head confluence differential reducer can meet the special specifications of the rotary drilling rig.

[0107] The reducer in this embodiment can be based on the requirements of some special specifications of rotary drilling rigs for the output characteristics of the power head, and at the same time achieve reasonable size matching between the reducer and the power head. The multi-stage differential power flow confluence input method will be the most appropriate choice. In this embodiment, two sets of differential motors 8 are used. In other embodiments, three or more reducers can also be included. The algorithm of its transmission ratio can refer to the algorithm in the above embodiment.

[0108] In this embodiment, when the reducer performs normal transmission, the main power is transmitted to the output transmission mechanism only through the main motor 9; and by controlling the differential transmission mechanism corresponding to each differential motor 8, the corresponding differential motor 8 does not transmit the auxiliary power to the output transmission mechanism;

[0109] When the reducer performs differential transmission only through a differential motor 8, the main power is transmitted to the output transmission mechanism through the main motor 9; by controlling the differential transmission mechanism corresponding to the differential motor 8 providing the auxiliary power, the differential motor 8 providing the auxiliary power transmits the auxiliary power to the output transmission mechanism, and by controlling the differential transmission mechanism corresponding to the differential motor 8 not providing the auxiliary power, the differential motor 8 not providing the auxiliary power does not transmit the auxiliary power to the output transmission mechanism;

[0110] When the reducer performs differential transmission through the two differential motors 8, the main power is transmitted to the output transmission mechanism through the main motor 9; and by controlling the differential transmission mechanism corresponding to each differential motor 8, the corresponding differential motor 8 transmits the auxiliary power to the output transmission mechanism.

[0111] In Figure 3, T1 is the input torque of the main motor 9, N1 is the input speed of the main motor 9, T2 is the input torque of the differential motor 8, N2 is the input speed of the differential motor 8, Za1 is the first-stage sun gear 11, Zg1 is the first-stage planetary gear 12, Zb1 is the differential ring gear 13, Za2 is the second-stage sun gear 14, zg2 is the second-stage planetary gear 15, Zb2 is the second-stage ring gear 16, and Z1 and Z2 are two gears in the differential gear pair 18 respectively.

[0112] Motor matching can be selected in the following ways:

[0113] According to the current requirements for the use of rotary drilling rigs, the main motor 9 is usually composed of an automatic variable motor, and the differential motor 8 can be an automatic variable motor or a fixed motor, according to the requirements for the output characteristics of the main engine power head:

[0114] ⑴ Both the main motor and the differential motor are automatic variable motors: they can realize the output characteristics of the rotary drilling rig power head adaptive to the external load, that is, automatically adjust the power head output torque and speed according to the external load, opening up a new situation for the intelligent operation of the rotary drilling rig;

[0115] (2) The main motor adopts an automatic variable motor, and the differential motor adopts a fixed motor: limited or single operating gears can be achieved, which will be particularly useful for rotary drilling rigs with certain special specifications and functions. For example, for small rotary drilling rigs with specifications below 200, the assessment indicator is often its construction efficiency. At this time, whether the rotary drilling rig has a long-term stable and reliable high-speed soil unloading function is the most critical indicator, and it is also a function that countless users have long been looking forward to.

[0116] ⑶ Both the main motor and the differential motor are quantitative motors: this configuration is not suitable for the current hydraulic system of the rotary drilling rig.

[0117] The rotary drilling rig power head confluence differential speed reducer and the corresponding rotary drilling rig power head in the present invention can open a precedent for the use of efficient construction and efficient soil unloading functions for large stock and in-production rotary drilling rigs, which is in line with the national environmental protection and energy conservation direction. The differential component in the rotary drilling rig power head confluence differential speed reducer is the first-stage internal gear ring (i.e., the differential gear ring 13), which uses the first-stage sun gear 11 and the first-stage planetary gear 12 for confluence, and the second-stage sun gear 14 and the second-stage planetary gear 15 in the second planetary assembly form a normal 2k-H planetary transmission; the second-stage gear ring 16 is fixed, the second-stage sun gear 14 inputs, and the second-stage planetary gear 15 outputs, the main and auxiliary motors are both positive transmission, and the two motors rotate in the same direction when differential drive is required.

[0118] The power head of a rotary drilling rig is usually driven by more than one motor, usually 2, 3, or 4 motors are driven simultaneously. If the power head of a rotary drilling rig adopts the rotary drilling rig power head confluence differential reducer of the present invention, there will be a corresponding additional auxiliary motor. Therefore, for a rotary drilling rig, it is necessary to control multiple main and auxiliary motors at the same time: synchronously and with power balance. Therefore, the power head of a rotary drilling rig is equipped with a control system to control the motor, and a differential reducer is used in conjunction with it.

[0119] The rotary drilling rig power head confluence differential speed reducer of the present invention comprises a main motor, at least one differential motor, a differential transmission mechanism corresponding in number to the differential motors, and an output transmission mechanism; the main motor is connected to the output transmission mechanism, and each differential motor is connected to the output transmission mechanism through the corresponding differential transmission mechanism; the rotary drilling rig power head including the speed reducer can choose whether to transmit the auxiliary power provided by the differential motor to the output transmission mechanism according to the actual working conditions. The rotary drilling rig power head confluence differential speed reducer of the present invention can make the rotary drilling rig meet the working needs of different working conditions, effectively improve the construction efficiency, easily meet the working needs of the rotary drilling rig, better protect the equipment, extend the service life of the core components, and achieve environmental protection and energy saving.

[0120] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A rotary drilling rig power head confluence differential reducer, characterized in that: The confluence differential speed reducer comprises a main motor, at least one differential motor, a number of differential transmission mechanisms corresponding to the number of the differential motors, and an output transmission mechanism; The main motor is connected to the output transmission mechanism, and each of the differential motors is connected to the output transmission mechanism through the corresponding differential transmission mechanism; The main motor transmits the main power to the output transmission mechanism, and each of the differential motors selectively transmits the corresponding auxiliary power to the output transmission mechanism through the corresponding differential transmission mechanism; Each of the differential transmission mechanisms comprises a differential input shaft, a clutch and a differential gear pair; Each of the differential motors is connected to the output transmission mechanism in sequence through the corresponding differential input shaft, clutch, and differential gear pair; By controlling the clutch, the corresponding auxiliary power provided by the differential motor is selectively transmitted to the output transmission mechanism; When the reducer performs normal transmission, the main power is transmitted to the output transmission mechanism only through the main motor; and the differential transmission mechanism corresponding to each differential motor is controlled so that the corresponding differential motor does not transmit the auxiliary power to the output transmission mechanism; When the speed reducer performs differential transmission only through part of the differential motors, the main power is transmitted to the output transmission mechanism through the main motor; by controlling the differential transmission mechanisms corresponding to the differential motors providing the auxiliary power, each differential motor providing the auxiliary power transmits the auxiliary power to the output transmission mechanism, and by controlling the differential transmission mechanisms corresponding to the differential motors not providing the auxiliary power, each differential motor not providing the auxiliary power does not transmit the auxiliary power to the output transmission mechanism; When the reducer performs differential transmission through all the differential motors, the main power is transmitted to the output transmission mechanism through the main motor; and by controlling the differential transmission mechanism corresponding to each of the differential motors, the corresponding differential motor transmits the auxiliary power to the output transmission mechanism.

2. The rotary drilling rig power head confluence differential reducer according to claim 1, characterized in that: The output transmission mechanism comprises an input spline shaft, a first planetary assembly, a second planetary assembly and an output base; The main motor is connected to the output base through the input spline shaft, the first planetary assembly, and the second planetary assembly in sequence; Each of the differential transmission mechanisms is connected to the input spline shaft via the differential gear pair in the differential transmission mechanism.

3. The rotary drilling rig power head confluence differential reducer according to claim 2, characterized in that: The first planetary assembly includes a first-stage sun gear, a first-stage planetary gear and a differential ring gear; The input spline shaft is connected to the second planetary assembly through the first-stage sun gear, the first-stage planetary gear and the first-stage ring gear in sequence.

4. The rotary drilling rig power head confluence differential reducer according to claim 2, characterized in that: The second planetary assembly includes a second-stage sun gear, a second-stage planetary gear and a second-stage ring gear; The first planetary assembly is connected to the output base via the second-stage sun gear, the second-stage planetary gear and the second-stage ring gear in sequence.

5. The rotary drilling rig power head confluence differential speed reducer according to claim 1, characterized in that: The main motor is an automatic variable motor.

6. A rotary drilling rig power head, characterized in that: The rotary drilling rig power head comprises the rotary drilling rig power head confluence differential reducer according to any one of claims 1 to 5.

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