Swivel head of double-input drilling machine

Abstract

A rotary head of a double-input drilling machine belongs to the technical field of engineering machinery and comprises a box cover and a box body, the box cover and the box body are both of an inverted triangle structure, and lubricating oil is contained in the box body. Two input gear shafts and an output shaft are installed on the box cover and the box body, the input gear shafts and the output shaft are transversely arranged, the two input gear shafts and the output shaft are integrally arranged in an inverted triangle shape, an output gear is fixedly installed on the output shaft, and the output shaft is meshed with the two input gear shafts through the output gear. The box cover and the box body are of an inverted triangle structure and are matched with inverted triangle arrangement of the input gear shaft and the output shaft, the overall width size, especially the bottom width, of the rotary head can be remarkably reduced, the installation area is greatly reduced, and the adaptability of the rotary head and a main machine is improved. Meanwhile, compared with grease lubrication, the box body is lubricated by the lubricating oil, frequent maintenance is not needed, the fluidity of the lubricating oil is good, the gear and the bearing can be effectively lubricated even in a low-temperature environment, and the service life of the rotary head is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, in particular to a dual-input drilling rig rotary head. Background Art

[0002] The rotary head is a key component of a drilling rig, primarily used to rotate the drill rod and drill bit to achieve drilling operations. A dual-input rotary head consists of two input shafts and one output shaft. Two power sources transmit power to their respective input shafts, which then mesh with the output shaft to transmit power.

[0003] The input shaft and output shaft of the dual-input drilling rig rotary head are usually arranged in the same plane, that is, the two input shafts are located on both sides of the output shaft and are at the same height from the mounting surface. Although the structure is simple and easy to process, for rotary heads requiring greater torque, as the gear increases, the same-plane arrangement will cause the width of the rotary head to increase sharply, requiring a larger mounting area and reducing its compatibility with the main machine. To solve the above problem, a rotary head (publication number CN222478622U) has been developed, in which the input and output shafts are arranged in an inverted triangle as a whole.

[0004] However, the existing slewing head has an input shaft and an output shaft arranged in an inverted triangle. Its box body and cover are generally rectangular, which limits the reduction of its volume and still occupies a large installation area (especially the bottom width). In terms of lubrication, due to the high dust working environment and high vibration working characteristics of the slewing head, it is more difficult to ensure the sealing reliability of the slewing head, so grease lubrication is generally used. However, grease lubrication has two problems compared to oil lubrication. First, it requires frequent maintenance and special tools. Second, grease has poor fluidity. Especially at low temperatures, the grease is almost completely solidified and cannot provide good lubrication for gears and bearings, which affects the service life of the slewing head. Summary of the Invention

[0005] In order to solve the technical problem in the above-mentioned background technology that the existing rotary head has an input shaft and an output shaft arranged in an inverted triangle, the box body and the box cover are rectangular as a whole, the volume reduction is limited, and it still occupies a large installation area, the present invention provides a dual-input drilling rig rotary head.

[0006] The technical solutions of the present invention are as follows: The application provides a double-input rotary head of a drilling machine, which comprises a box cover and a box body, both of which are in inverted triangular structures, and the box body is internally provided with lubricating oil; two input gear shafts and an output shaft are installed on the box cover and the box body, the input gear shafts and the output shaft are horizontally arranged, the two input gear shafts and the output shaft are arranged in an inverted triangular structure as a whole, the output shaft is fixedly provided with an output gear, and the output shaft is engaged with the two input gear shafts through the output gear. The inverted triangular structure of the box cover and the box body, in combination with the inverted triangular arrangement of the input gear shafts and the output shaft, can significantly reduce the overall width size of the rotary head, especially the bottom width, greatly reduce the installation area, and improve the adaptability to the main machine; meanwhile, the box body is lubricated by the lubricating oil, compared with grease lubrication, the lubricating oil does not need frequent maintenance, and has good flowability, so that the effective lubrication of the gear and the bearing can be ensured even in a low-temperature environment, and the service life of the rotary head is prolonged.

[0007] Preferably, the two ends of the output shaft extend out of the box cover and the box body, a connecting seat is fixedly installed on the box cover, and a sealing seat is fixedly installed on the box body; the output shaft comprises a large-end and a small-end, the small-end is inserted into the connecting seat, a high-pressure air interface is formed in the connecting seat and communicates with the inside of the output shaft, and the large-end penetrates through the sealing seat and is used for being connected with a drill rod. The high-pressure air interface communicates with the inside of the output shaft, so that high-pressure air can be conveniently delivered to the drill rod through the output shaft to realize the functions of slag discharge and the like and improve the drilling operation efficiency; the sealing seat and the connecting seat are arranged to facilitate sealing and prevent oil leakage.

[0008] Preferably, first bearing mounting holes and second bearing mounting holes are formed in the box cover, and the first bearing mounting holes are distributed on the upper sides of the second bearing mounting holes; third bearing mounting holes and fourth bearing mounting holes are formed in the box body, and the third bearing mounting holes are distributed on the upper sides of the fourth bearing mounting holes. The position distribution of the bearing mounting holes is matched with the inverted triangular arrangement of the input gear shafts and the output shaft, so that the bearings can be accurately installed, the stable assembly of the input gear shafts and the output shaft is ensured, and the compactness and stability of the overall structure of the rotary head are improved.

[0009] Preferably, one end of the input gear shaft is rotatably installed in the first bearing mounting hole through a second cylindrical roller bearing, and the other end is rotatably installed in the third bearing mounting hole through a self-aligning roller bearing. The second cylindrical roller bearing can bear a large radial load, and the self-aligning roller bearing can adapt to slight deflection of the shaft, so that the stable rotation of the input gear shaft is ensured, the load bearing capacity and the operation reliability of the input gear shaft are improved, and the complex stress environment during the drilling operation is adapted.

[0010] Preferably, a first tapered bearing is mounted at the small end of the output shaft, and a second tapered bearing and a first cylindrical roller bearing are mounted axially outward at the large end, sequentially from the inside out. The first tapered bearing is mounted in the second bearing mounting hole, and the first cylindrical roller bearing and the second tapered bearing are mounted in the fourth bearing mounting hole. The tapered bearing can simultaneously withstand radial and axial loads, while the cylindrical roller bearing enhances radial load capacity. Multiple bearings installed at both ends of the output shaft effectively disperse the load on the output shaft, ensuring high-speed, stable rotation of the output shaft and improving transmission efficiency and service life.

[0011] Preferably, an oil seal and a dust ring are disposed axially from the inside outward at the large end of the output shaft. Two oil seals are provided, each fixedly mounted within a seal seat. One end of the seal seat is inserted into the fourth bearing mounting hole, and an O-ring is disposed between the seal seat and the fourth bearing mounting hole. The combination of the double oil seal and dust ring effectively prevents lubricating oil leakage from the housing while blocking the ingress of dust and impurities. The O-ring further enhances sealing performance, adapting to high-dust working environments and ensuring lubrication and cleanliness of internal components.

[0012] Preferably, two oil seals are installed between the output shaft's small end and the connecting base, spaced axially in sequence. One end of the connecting base is inserted into the first bearing mounting hole, and a sealing ring is provided between the connecting base and the first bearing mounting hole. The two spaced oil seals enhance the sealing reliability of the output shaft's small end, preventing lubricating oil leakage from this end. The sealing ring ensures a tight seal between the connecting base and the housing cover, further improving the overall sealing performance and ensuring the effectiveness of the oil lubrication system.

[0013] Preferably, connecting bases are fixedly provided on both sides of the bottom of the box body. The connecting bases are long plate-shaped structures, which can effectively reduce the space occupied and reduce the bottom width of the box body.

[0014] Preferably, the outer ring gear of the output gear meshes with the input gear shaft. A connecting spline is fixedly disposed along the circumference of the inner ring of the output gear, and a positioning hole is formed in the inner ring of the output gear, coaxially arranged with the inner ring of the output gear. Splines and a positioning shaft are fixedly disposed along the circumference of the outer wall of the output shaft, and the positioning shaft is inserted into the positioning hole. The connecting spline ensures reliable torque transmission between the output gear and the output shaft, and the cooperation of the positioning shaft and the positioning hole achieves precise coaxial positioning of the output gear and the output shaft, ensuring the stability of the meshing transmission, reducing gear wear, and extending service life.

[0015] Preferably, an air passage is provided inside the output shaft, which provides a circulation channel for media such as high-pressure air, facilitates slag removal, drill bit cooling and other functions during the drilling process, and improves drilling efficiency and drill bit service life.

[0016] It can be seen from the above technical solutions that the advantages of the present invention are: 1. The box cover and box body adopt an inverted triangle structure, which, combined with the inverted triangle arrangement of the input gear shaft and output shaft, can significantly reduce the overall width of the slewing head, especially the bottom width, greatly reducing the installation area and improving the compatibility with the host. At the same time, the box body is lubricated with lubricating oil, which does not require frequent maintenance compared to grease lubrication. The lubricating oil has good fluidity and can ensure effective lubrication of gears and bearings even in low temperature environments, thereby extending the service life of the slewing head.

[0017] 2. The big end of the output shaft adopts a combination of double oil seals and dust rings, which can effectively prevent the leakage of lubricating oil in the box body and block the entry of external dust and impurities. The O-ring further improves the sealing performance, adapts to high-dust working environments, and ensures the lubrication effect and cleanliness of internal parts. Two oil seals are installed between the small end and the connecting seat to enhance the sealing reliability of the small end of the output shaft and prevent lubricating oil leakage. The sealing ring ensures the sealing between the connecting seat and the box cover, further improving the overall sealing performance and ensuring the effectiveness of the oil lubrication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 is a schematic cross-sectional view of a dual-input drilling rig rotary head according to one or more embodiments of the present invention; Figure 2 is a schematic perspective structural diagram of a dual-input drilling rig rotary head according to one or more embodiments of the present invention; Figure 3 The structure of the box cover according to one or more embodiments of the present invention is schematically shown. Figure 1 ; Figure 4 The structure of the box cover according to one or more embodiments of the present invention is schematically shown. Figure 2 ; Figure 5 The structure of the box according to one or more embodiments of the present invention is schematically shown. Figure 1 ; Figure 6 The structure of the box according to one or more embodiments of the present invention is schematically shown. Figure 2 ; Figure 7 is a schematic structural diagram of an input gear shaft according to one or more embodiments of the present invention; Figure 8Fig. 1 is a schematic view of an input gear according to one or more embodiments of the present application; Figure 9 Fig. 2 is a schematic view of an output shaft according to one or more embodiments of the present application; Figure 10 Fig. 3 is a schematic view of a seal seat according to one or more embodiments of the present application; Figure 11 Fig. 4 is a schematic view of a connecting seat according to one or more embodiments of the present application; The components represented by the reference numerals in the drawings are as follows: 1, box cover; 101, motor mounting seat; 102, connecting seat mounting hole; 103, first connecting hole; 104, first bearing mounting hole; 105, second bearing mounting hole; 106, breather plug mounting hole; 2, box body; 201, third bearing mounting hole; 202, fourth bearing mounting hole; 203, second connecting hole; 204, seal seat mounting hole; 205, connecting base; 3, input gear shaft; 301, input spline; 302, gear ring; 4, output gear; 401, connecting spline; 402, positioning hole; 5, output shaft; 501, spline; 502, positioning shaft; 503, breather hole; 504, taper thread; 6, seal seat; 601, positioning stop; 602, first fixing hole; 603, oil seal mounting hole; 604, dust-proof ring mounting groove; 605, O-ring groove; 7, connecting seat; 701, second fixing hole; 702, seal ring groove; 703, pipe thread; 704, oil seal groove; 8, first tapered bearing; 9, second tapered bearing; 10, first cylindrical roller bearing; 11, oil seal; 12, dust-proof ring; 13, second cylindrical roller bearing; 14, angular contact ball bearing; 15, seal ring; 16, breather plug; 17, high-pressure air interface. DETAILED DESCRIPTION

[0020] In order to make the objectives, features and advantages of the present application more obvious and easy to understand, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present patent, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present patent.

[0021] Embodiment 1 In a typical embodiment of the present application, as Figures 1-11As shown, a dual-input drilling rig rotary head is proposed, including: a box cover 1, a box body 2, an input gear shaft 3, an output gear 4 and an output shaft 5, wherein the box cover 1 and the box body 2 are detachably connected to constitute the supporting body of the rotary head, providing installation space for components such as the input gear shaft 3 and the output shaft 5, and the box body 2 is filled with lubricating oil for lubricating the components in the box body 2. There are two input gear shafts 3 and one output shaft 5, and the two input gear shafts 3 and the output shaft 5 are arranged in an inverted triangle. The output gear 4 is installed on the output shaft 5, and the output shaft 5 is engaged with the two input gear shafts 3 through the output gear 4; both ends of the output shaft 5 protrude outward from the box cover 1 and the box body 2.

[0022] Specifically, the input gear shaft 3 and the output shaft 5 are both arranged horizontally and parallel, and the two input gear shafts 3 are located on both sides above the output shaft 5 (i.e., the upper left and upper right positions), which is conducive to reducing the installation width of the slewing head, reducing the installation area requirements of the main unit, and improving the adaptability of the main unit.

[0023] In order to further reduce the installation area requirements of the host, such as Figure 2 As shown, both the box cover 1 and the box body 2 are inverted triangle structures, and the corners of the box cover 1 and the box body 2 are passivated to further reduce the width dimensions of the box cover 1 and the box body 2.

[0024] Specific as Figure 3 and Figure 4 As shown, the box cover 1 is provided with a first bearing mounting hole 104 and a second bearing mounting hole 105, two first bearing mounting holes 104 are provided, and one second bearing mounting hole 105 is provided. The two first bearing mounting holes 104 are distributed on both sides above the second bearing mounting hole 105, so that the first bearing mounting holes 104 and the second bearing mounting holes 105 are arranged in an inverted triangle as a whole. The first bearing mounting hole 104 is used for installing the input gear shaft 3 and its bearing, and the second bearing mounting hole 105 is used for installing the output shaft 5 and its bearing; two motor mounting seats 101 are fixedly installed on the outer surface of the box cover 1, and the motor mounting seat 101 is fixed to the first bearing The mounting holes 104 correspond to each other and are coaxially arranged. The motor mounting seat 101 is used for installing the motor, and the motor is used to drive the input gear shaft 3 to rotate around the axis; a number of connecting seat mounting holes 102 are provided on the box cover 1, and the connecting seat mounting holes 102 are distributed on the surrounding side of the second bearing mounting hole 105 for the installation of the connecting seat 7; a vent plug mounting hole 106 is opened at the top center position of the box cover 1 for the installation of the vent plug 16, and the vent plug 16 adopts a one-way structure to prevent external impurities from entering the box body 2; a number of first connecting holes 103 are provided at intervals on the surrounding side of the box cover 1 for the installation of bolts, and the box cover 1 is fixedly connected to the box body 2 by bolts.

[0025] like Figure 5 and Figure 6As shown, the box body 2 is inverted triangular structure, the bottom of the box body 2 is fixedly provided with a connecting base 205, a plurality of through holes are formed in the connecting base 205 for the installation of bolts, thereby realizing the fixed connection of the whole rotary head and the main machine, the connecting base 205 is a long strip plate structure, which can effectively reduce the occupation of space and reduce the width of the bottom of the box body 2; a third bearing mounting hole 201 and a fourth bearing mounting hole 202 are also formed in the box body 2, wherein the third bearing mounting hole 201 is coaxially arranged with the first bearing mounting hole 104 on the box cover 1 in one-to-one correspondence, for the installation of the input gear shaft 3 and its bearing; the fourth bearing mounting hole 202 is coaxially arranged with the second bearing mounting hole 105 on the box cover 1, for the installation of the output shaft 5 and its bearing.

[0026] A plurality of second connecting holes 203 are also formed in the box body 2, the second connecting holes 203 are arranged at intervals along the circumferential side of the box body 2, and the second connecting holes 203 correspond to the first connecting holes 103 in one-to-one correspondence, for the installation of bolts, thereby realizing the fixed connection between the box body 2 and the box cover 1; a sealing seat mounting hole 204 is also formed in the outer surface of the box body 2, the sealing seat mounting hole 204 is arranged on the circumferential side of the fourth bearing mounting hole 202, for the fixed installation of the sealing seat 6.

[0027] As shown in the figure, Figure 1 The input gear shaft 3 is supported by double bearings and fixedly installed in the corresponding first bearing mounting hole 104 and third bearing mounting hole 201 of the box cover 1 and box body 2, wherein the end of the input gear shaft 3 close to the motor mounting seat 101 is provided with a second cylindrical roller bearing 13, the second cylindrical roller bearing 13 is installed in the first bearing mounting hole 104, so as to improve the positioning accuracy and ensure the cooperation and installation with the motor power shaft, the other end of the input gear shaft 3 is provided with a self-aligning roller bearing 14, the self-aligning roller bearing 14 is installed in the third bearing mounting hole 201, so as to eliminate the adverse effects caused by installation errors or shaft deformation and prolong the service life of the rotary head, since one end of the input gear shaft 3 is installed inside the box body 2 and the other end is directly connected with the motor power shaft, there is no need to additionally set a sealing structure to realize sealing.

[0028] As shown in the figure, Figure 7 The input gear shaft 3 includes an input spline 301 and a gear ring 302, the end of the input gear shaft 3 for connecting with the motor power shaft is an open end, the input spline 301 is fixedly arranged in the open end of the input gear shaft 3, and the input spline 301 is arranged along the ring direction, so as to be connected with the motor power shaft; the gear ring 302 is fixedly arranged on the outer surface of the input gear shaft 3 and arranged along the ring direction of the input gear shaft 3, the gear ring 302 is used for engaging with the output gear 4, so as to realize the transmission of power.

[0029] The output gear 4 is fixedly installed on the output shaft 5 in a sleeving manner, for driving the output shaft 5 to synchronously rotate around the shaft, as shown in Figure 8 The inner ring of the output gear 4 is fixedly provided with a connecting spline 401 along the ring direction, for being fixedly connected with the output shaft 5 in a spline connection manner; the outer ring of the output gear 4 is used for meshing with the ring 302 of the input gear shaft 3; the inner ring of the output gear 4 is further provided with a positioning hole 402 coaxially arranged with the inner ring of the output gear 4, and the diameter of the positioning hole 402 is smaller than that of the inner ring; the positioning hole 402 is located at one side of the connecting spline 401; the inner diameter of the positioning hole 402 is larger than that of the space surrounded by the connecting spline 401, so that a stepped hole structure is formed at the position of the inner ring of the output gear 4, for the installation and positioning of the output gear 4 on the output shaft 5.

[0030] The output shaft 5 is of a variable diameter structure, as shown in Figure 9 The outer wall of the output shaft 5 is fixedly provided with a spline 501 along the ring direction, for cooperating with the connecting spline 401 on the output gear 4, so as to limit the relative rotation between the output shaft 5 and the output gear 4, so that the two can synchronously rotate around the shaft; the outer wall of the output shaft 5 is further fixedly provided with a positioning shaft 502 along the ring direction, the positioning shaft 502 is located at one side of the spline 501, and the outer diameter of the positioning shaft 502 is larger than that of the spline 501; the positioning shaft 502 is used for being inserted into the positioning hole 402, so as to limit the axial movement of the output gear 4, and further position the output gear 4.

[0031] The output shaft 5 is of a hollow structure, and the inside of the output shaft 5 is provided with a gas passage 503 for the passage of high-pressure gas; the output shaft 5 includes a large end and a small end, the large end of the output shaft 5 is the output end, and the inside of the output end of the output shaft 5 is provided with a tapered thread 504 for connection with a drill rod.

[0032] The output shaft 5 is fixedly installed on the box body 2 and the box cover 1 by a three-support positioning structure, as shown in Figure 1 The main support is a pair of oppositely arranged first tapered bearing 8 and second tapered bearing 9, both of which are fixedly sleeved on the output shaft 5, for bearing all axial forces and most of the radial forces during the operation of the rotary head; the first tapered bearing 8 is installed in the second bearing installation hole 105; the auxiliary support is a first cylindrical roller bearing 10, which is also fixedly sleeved on the output shaft 5, and is located at one side of the second tapered bearing 9 away from the first tapered bearing 8; in this embodiment, the first cylindrical roller bearing 10 and the second tapered bearing 9 are located at the output end of the output shaft 5, and both are installed in the fourth bearing installation hole 202; the first cylindrical roller bearing 10 is arranged close to the oil seal 11, for improving the rotation accuracy, and further improving the impact resistance and sealing performance of the rotary head.

[0033] The output end of the output shaft 5 is provided with a triple sealing protection structure, which specifically comprises two oil seals 11 and a dust ring 12. The oil seals 11 and the dust ring 12 are sequentially arranged in the axial direction from inside to outside, and are fixedly installed in a sealing seat 6. The sealing seat 6 is fixedly installed at the sealing seat mounting hole 204 of the box body 2 through bolts. The oil seal 11 is located on the inner side of the dust ring 12. The double oil seals 11 on the inner side are used to block the oil in the box body 2 to prevent oil leakage. The dust ring 12 on the outer side is used to isolate the external dust environment, so as to ensure the reliability and service life of the oil seal 11 of the rotary head in a high-dust environment.

[0034] As shown in Figure 10 , the sealing seat 6 is in a ring structure. The sealing seat 6 is provided with first fixing holes 602 at intervals on the circumferential side. The number of the first fixing holes 602 is the same as and corresponds to the number of the sealing seat mounting holes 204, so as to fix the sealing seat 6 on the box body 2 through bolts. The sealing seat 6 is fixedly provided with a positioning stop 601 on the side close to the box body 2. The positioning stop 601 is in a ring-shaped protruding structure, which is used to be inserted into the fourth bearing mounting hole 202 of the box body 2. An oil seal mounting hole 603 is formed on the inner ring of the positioning stop 601 in the circumferential direction, which is used for the installation of the oil seal 11. An O-ring groove 605 is formed on the outer ring of the positioning stop 601 in the circumferential direction, which is used for the installation and positioning of the O-shaped sealing ring. The outer side of the oil seal mounting hole 603 is provided with a dust ring mounting groove 604, which is formed on the inner ring of the sealing seat 6. The dust ring mounting groove 604 is used for the installation and positioning of the dust ring 12.

[0035] As shown in Figure 1 , the box cover 1 is detachably provided with a connecting seat 7, which is connected with the connecting seat mounting hole 102. The small end of the output shaft 5 is inserted into the connecting seat 7. The connecting seat 7 is used to connect with high-pressure gas, so as to improve the hole cleaning and deslagging capacity of the drill bit. Two oil seals 11 are arranged between the small end of the output shaft 5 and the connecting seat 7, which are sequentially and spacedly arranged in the axial direction, so as to prevent the external gas from entering the inside of the box body 2.

[0036] As shown in Figure 11As shown, the connecting seat 7 is a hollow boss structure, and a plurality of second fixing holes 701 are arranged on the connecting seat 7 at intervals along the circumferential direction, the second fixing holes 701 are connected with the connecting seat mounting holes 102 on the box cover 1 through bolts, one end of the connecting seat 7 is inserted into the first bearing mounting hole 104, and a sealing ring groove 702 is arranged on the connecting seat 7 for mounting the sealing ring 15, the connecting seat 7 and the first bearing mounting hole 104 are sealed by the sealing ring 15; one end of the connecting seat 7 extending out of the box cover 1 is provided with a high-pressure air interface 17, a pipe thread 703 is arranged in the high-pressure air interface 17 for connecting with a gas pipeline, the inside of the connecting seat 7 is communicated with the air passing hole 503 of the output shaft 5; and an oil seal groove 704 is arranged in the inside of the connecting seat 7 at intervals along the axial direction for mounting the oil seal 11.

[0037] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-input drilling rig rotary head, comprising: The box cover (1) and the box body (2) are characterized in that the box cover (1) and the box body (2) are both inverted triangle structures, and the box body (2) is filled with lubricating oil; two input gear shafts (3) and an output shaft (5) are installed on the box cover (1) and the box body (2), the input gear shafts (3) and the output shaft (5) are both arranged horizontally, and the two input gear shafts (3) and the output shaft (5) are arranged in an inverted triangle as a whole, and an output gear (4) is fixedly installed on the output shaft (5), and the output shaft (5) is meshed with the two input gear shafts (3) through the output gear (4).

2. The dual-input drilling rig rotary head according to claim 1, characterized in that: The two ends of the output shaft (5) extend outward from the box cover (1) and the box body (2), a connecting seat (7) is fixedly installed on the box cover (1), and a sealing seat (6) is fixedly installed on the box body (2); the output shaft (5) includes a large head end and a small head end, the small head end is inserted into the connecting seat (7), a high-pressure air interface (17) is opened on the connecting seat (7), the high-pressure air interface (17) is communicated with the interior of the output shaft (5), and the large head end passes through the sealing seat (6) for connection with the drill pipe.

3. The dual-input drilling rig rotary head according to claim 2, characterized in that: The box cover (1) is provided with a first bearing mounting hole (104) and a second bearing mounting hole (105), and the first bearing mounting hole (104) is distributed on both sides above the second bearing mounting hole (105); the box body (2) is provided with a third bearing mounting hole (201) and a fourth bearing mounting hole (202), and the third bearing mounting hole (201) is distributed on both sides above the fourth bearing mounting hole (202).

4. The dual-input drilling rig rotary head according to claim 3, characterized in that: One end of the input gear shaft (3) is rotatably mounted in the first bearing mounting hole (104) via a second cylindrical roller bearing (13), and the other end is rotatably mounted in the third bearing mounting hole (201) via a spherical roller bearing (14).

5. The dual-input drilling rig rotary head according to claim 3, characterized in that: A first tapered bearing (8) is installed at the small end of the output shaft (5), and a second tapered bearing (9) and a first cylindrical roller bearing (10) are installed at the large end in sequence from the inside to the outside along the axial direction. The first tapered bearing (8) is installed in the second bearing mounting hole (105), and the first cylindrical roller bearing (10) and the second tapered bearing (9) are installed in the fourth bearing mounting hole (202).

6. The dual-input drilling rig rotary head according to claim 3, characterized in that: An oil seal (11) and a dust ring (12) are sequentially arranged at the big end of the output shaft (5) along the axial direction from the inside to the outside. Two oil seals (11) are provided. The oil seals (11) and the dust rings (12) are fixedly installed in the sealing seat (6). One end of the sealing seat (6) is inserted into the fourth bearing mounting hole (202). An O-ring is provided between the sealing seat (6) and the fourth bearing mounting hole (202).

7. The dual-input drilling rig rotary head according to claim 3, characterized in that: Two oil seals (11) are provided between the small end of the output shaft (5) and the connecting seat (7), and the two oil seals (11) are arranged in sequence along the axial direction. One end of the connecting seat (7) is inserted into the first bearing mounting hole (104), and a sealing ring (15) is provided between the connecting seat (7) and the first bearing mounting hole (104).

8. The dual-input drilling rig rotary head according to claim 1, characterized in that: Connecting bases (205) are fixedly provided on both sides of the bottom of the box body (2), and the connecting bases (205) are long strip-shaped structures.

9. The dual-input drilling rig rotary head according to claim 1, characterized in that: The outer gear ring (302) of the output gear (4) is meshed with the input gear shaft (3); a connecting spline (401) is fixedly provided on the inner ring of the output gear (4) along its circumferential direction, and a positioning hole (402) is opened on the inner ring of the output gear (4); the positioning hole (402) is coaxially arranged with the inner ring of the output gear (4); a spline (501) and a positioning shaft (502) are fixedly provided on the outer wall of the output shaft (5) along its circumferential direction, and the positioning shaft (502) is inserted into the positioning hole (402).

10. The dual-input drilling rig rotary head according to claim 1, characterized in that: An air passage (503) is provided inside the output shaft (5).

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