Transmission box, power head and rotary drilling rig

Abstract

The present invention provides a transmission box, comprising: a box body; an input shaft, rotatably connected to the box body through a connecting piece; a slewing bearing, comprising a first ring body and a second ring body, the first ring body and the second ring body rotatably cooperate with each other, an anti-overturning member is provided between the first ring body and the second ring body, the first ring body is in transmission cooperation with the input shaft, and the second ring body is connected to the box body; and a sleeve, connected to the first ring body. The present invention also provides a power head, comprising the above-mentioned transmission box and a reducer, wherein the input shaft is connected to the reducer. The present invention also provides a rotary drilling rig, comprising the above-mentioned power head. The anti-overturning member can increase the rated overturning moment of the slewing bearing, thereby enabling the sleeve to remain stable after being subjected to an overturning force. The sleeve only needs to be connected to the first ring body, which simplifies the structure of the transmission box and reduces costs. In addition, when processing the sleeve, it is only necessary to ensure the matching accuracy of the sleeve and the slewing bearing, which reduces the processing difficulty of the transmission box and can also reduce costs.

Description

Technical Field

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

[0002] Currently, the transmission case of a rotary drilling rig's power head is equipped with a slewing bearing. This bearing consists of an outer ring and an inner ring that rotate in unison. The inner ring is fixed to the transmission case housing, while the outer ring is both linked to the transmission case's input shaft and connected to a sleeve. Driven by the input shaft, the outer ring rotates the drill rod through the sleeve. The input shaft is rotatably connected to the transmission case housing via two bearings. To ensure the sleeve's stability during rotation, a bearing is also placed between the sleeve and the housing.

[0003] In the above-mentioned transmission case, the sleeve is rotationally engaged with the transmission case housing via both the bearing and the slewing bearing. Supported by the bearing and the slewing bearing, the sleeve remains stable even when subjected to overturning forces during operation.

[0004] During the sleeve machining process, it is necessary to ensure the matching accuracy between the sleeve and the bearing, as well as the matching accuracy between the sleeve and the slewing bearing, which is difficult and costly. In addition, the simultaneous configuration of the slewing bearing and the bearing on the transmission housing makes the transmission structure more complex and expensive. Summary of the Invention

[0005] In order to solve the problem in the prior art that the transmission box is difficult to manufacture and has a complex structure, one of the purposes of the present invention is to provide a transmission box.

[0006] The present invention provides the following technical solutions:

[0007] A transmission box is applied to a power head, and the transmission box comprises:

[0008] Box;

[0009] An input shaft, rotatably connected to the housing via a connecting piece;

[0010] A slewing bearing, comprising a first ring body and a second ring body, wherein the first ring body and the second ring body are rotatably engaged with each other, an anti-overturning member is provided between the first ring body and the second ring body, the first ring body is in driving engagement with the input shaft, and the second ring body is connected to the housing; and

[0011] The sleeve is connected to the first ring body.

[0012] As a further optional solution for the transmission box, two first annular grooves are provided on the wall of the first ring body facing the second ring body, and the two first annular grooves are arranged along the axial direction of the first ring body, and two second annular grooves are correspondingly provided on the wall of the second ring body facing the first ring body, and the anti-overturning part includes a plurality of balls embedded in the first annular grooves and the second annular grooves.

[0013] As a further optional solution for the transmission box, a third annular groove is provided on the wall of the first ring body facing the second ring body, and an annular protrusion is provided on the wall of the second ring body facing the first ring body, and the annular protrusion is located in the third annular groove. The anti-overturning part includes a plurality of first rollers arranged between the annular protrusion and the two side walls of the third annular groove, and the first rollers are arranged along the radial direction of the first ring body.

[0014] As a further optional solution for the transmission box, a retaining frame is provided between the annular protrusion and both side walls of the third annular groove, and the retaining frame ensures that the first rollers are always evenly distributed along the circumference of the first ring body.

[0015] As a further optional solution for the transmission box, the anti-overturning member also includes a plurality of second rollers arranged between the annular protrusion and the bottom of the third annular groove, and the axis of the second rollers is parallel to the axis of the first ring body.

[0016] As a further optional solution for the transmission box, the bottom of the third annular groove is provided with a plurality of receiving grooves corresponding to the second rollers, the receiving grooves are evenly distributed along the circumference of the second ring body, and the second rollers are embedded in the corresponding receiving grooves.

[0017] As a further optional solution for the transmission box, the connecting member is a bearing.

[0018] As a further optional solution for the transmission box, a gear transmission is implemented between the first ring body and the input shaft, and the first ring body is integrally formed with external teeth.

[0019] Another object of the present invention is to provide a power head.

[0020] The present invention provides the following technical solutions:

[0021] A power head is applied to a rotary drilling rig, comprising the transmission box and a reducer, wherein the input shaft is connected to the reducer.

[0022] Another object of the present invention is to provide a rotary drilling rig.

[0023] The present invention provides the following technical solutions:

[0024] A rotary drilling rig comprises the above-mentioned power head.

[0025] The embodiments of the present invention have the following beneficial effects:

[0026] The anti-overturning member, positioned between the first and second rings, increases the rated overturning moment of the slewing bearing. Furthermore, the sleeve is connected to the first ring, and through the slewing bearing, it rotates with the housing, ensuring stability even after being subjected to overturning forces. Since the sleeve only needs to be connected to the first ring, there is no need for a bearing between the sleeve and the housing, simplifying the transmission case structure and reducing costs. Furthermore, during machining, only the sleeve and slewing bearing must be precisely matched, reducing the machining complexity of the transmission case and also lowering costs.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the internal structure of a transmission case provided in Example 1 of the present invention is shown;

[0030] Figure 2 A schematic diagram of the internal structure of a transmission box provided in Example 2 of the present invention is shown;

[0031] Figure 3 Shown Figure 2 A in the middle is an enlarged schematic diagram;

[0032] Figure 4 A schematic diagram of the slewing bearing in the transmission box provided in Example 3 of the present invention is shown.

[0033] Description of main component symbols:

[0034] 1-housing; 2-input shaft; 21-connecting part; 3-slewing bearing; 31-first ring body; 311-first annular groove; 312-third annular groove; 313-accommodating groove; 32-second ring body; 321-second annular groove; 322-annular protrusion; 33-anti-overturning part; 331-ball; 332-first roller; 333-cage; 334-second roller; 4-sleeve; 41-flange. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0037] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] Furthermore, 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 number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the template description herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Example 1

[0041] See also Figure 1, this embodiment provides a transmission box, which is used in the power head of a rotary drilling rig to transmit the force output by the reducer of the power head to the drill rod. The transmission box includes a housing 1, an input shaft 2, a slewing bearing 3 and a sleeve 4. Among them, the input shaft 2 is installed on the housing 1 through a connecting member 21, rotates with the housing 1, and is connected to the output shaft of the reducer of the power head. The slewing bearing 3 is composed of a first ring body 31, a second ring body 32 and an anti-overturning member 33. The first ring body 31 rotates with the second ring body 32 and remains stable under the support of the anti-overturning member 33. Among them, the first ring body 31 is connected to the sleeve 4 and is in transmission cooperation with the input shaft 2. The second ring body 32 is connected to the housing 1, so that the sleeve 4 is indirectly connected to the housing 1 in rotation.

[0042] The anti-overturning member 33 is disposed between the first and second ring bodies 31, 32, and can significantly increase the rated overturning moment of the slewing bearing 3. Furthermore, the sleeve 4 is connected to the first ring body 31, and the slewing bearing 3 rotates with the housing 1, ensuring stability even after being subjected to an overturning force.

[0043] Since the sleeve 4 is connected only to the first ring 31, no bearing structure is required between the sleeve 4 and the housing 1, simplifying the structure of the transmission case and reducing costs. In addition, when machining the sleeve 4, only the matching accuracy between the sleeve 4 and the slewing bearing 3 needs to be ensured, which greatly reduces the machining difficulty of the transmission case and also reduces costs.

[0044] Example 2

[0045] Please also refer to Figure 2 and Figure 3 This embodiment provides a transmission case for use in the power head of a rotary drilling rig, transmitting the force output by the power head's reducer to the drill pipe. The transmission case comprises a housing 1, an input shaft 2, a slewing bearing 3, and a sleeve 4. The housing 1 serves as the supporting structure, with the input shaft 2 and slewing bearing 3 mounted on the housing 1. The sleeve 4 is indirectly connected to the housing 1 via the slewing bearing 3.

[0046] The housing 1 is provided with two mounting holes for the input shaft 2 and the sleeve 4 to pass through respectively. The slewing bearing 3 is installed inside the housing 1 , and the through hole in the middle of the slewing bearing 3 is aligned with the mounting hole where the sleeve 4 is located.

[0047] The input shaft 2 is coaxially arranged with the mounting hole in which it is located, and the top end of the input shaft 2 is connected to the output shaft of the reducer in the power head through a coupling, a spline sleeve or a flange.

[0048] Considering that the lower end of the output shaft of the speed reducer has a bearing structure, only one bearing is provided on the input shaft 2 as a connecting member 21, and the input shaft 2 is rotatably connected to the housing 1 through the bearing.

[0049] The bearing is arranged at the bottom end of the input shaft 2, and cooperates with the bearing structure at the lower end of the output shaft of the reducer to keep the input shaft 2 stable during rotation.

[0050] Since input shaft 2 is connected to housing 1 via only one bearing, the transmission case structure is simplified, reducing production costs. Furthermore, during machining, only the coaxiality of input shaft 2 and one bearing must be ensured, requiring less precision and reducing costs.

[0051] The slewing bearing 3 includes a first ring body 31 and a second ring body 32. The first ring body 31 is in driving engagement with the input shaft 2, while the second ring body 32 is fixedly connected to the housing 1 via bolts. Furthermore, the first ring body 31 surrounds the outside of the second ring body 32, is coaxially arranged with the second ring body 32, and rotates in engagement with the second ring body 32.

[0052] Specifically, a driving gear is provided in the middle of the input shaft 2 by key connection, welding or integral molding, and external teeth are integrally molded on the outer side wall of the first ring body 31, and the external teeth are meshed with the driving gear.

[0053] When the reducer drives the input shaft 2 to rotate, the input shaft 2 transmits power to the first ring body 31 through the driving gear and the external teeth, causing the first ring body 31 to rotate around the second ring body 32 .

[0054] The sleeve 4 is provided with a flange 41, which is coaxial with the sleeve 4 and welded to the outer wall of the sleeve 4. In addition, the outer edge of the flange 41 is in contact with the lower surface of the first ring body 31 and is fixed to the first ring body 31 by bolts, thereby fixing the sleeve 4 to the first ring body 31.

[0055] When the first ring body 31 rotates around the second ring body 32, the sleeve 4 also rotates accordingly, thereby driving the drill rod to complete the drilling work.

[0056] Sleeve 4 is connected to first ring 31 only via flange 41, and is indirectly rotatably connected to housing 1. No other bearing structure exists between sleeve 4 and housing 1, simplifying the transmission case structure and reducing costs. Furthermore, during machining, only the precision of the fit between sleeve 4 and slewing bearing 3 must be ensured, significantly reducing machining complexity and costs.

[0057] Since the drill rod is subjected to irregular radial pressure during drilling, the radial pressure is transmitted to the sleeve 4 and then further transmitted to the first ring body 31, causing the drill rod, sleeve 4 and first ring body 31 to tend to swing relative to their own axes, which is not conducive to stable drilling of the drill rod.

[0058] To solve this problem, it is necessary to enhance the anti-overturning capability of the drill pipe and the sleeve 4. Since the sleeve 4 is supported only by the first ring body 31, it is necessary to increase the rated overturning moment of the slewing bearing 3.

[0059] Based on this, two first annular grooves 311 are opened on the inner side wall of the first ring body 31 , and two second annular grooves 321 are opened on the outer side wall of the second ring body 32 .

[0060] The first annular groove 311 is provided along the circumference of the first ring body 31 , the two first annular grooves 311 are arranged along the axial direction of the first ring body 31 , and the two second annular grooves 321 are aligned with the two first annular grooves 311 respectively.

[0061] A plurality of balls 331 are embedded in the first annular groove 311 and the second annular groove 321 . The upper and lower rows of balls 331 constitute an anti-overturning member 33 , which stably connects the first ring body 31 and the second ring body 32 .

[0062] Specifically, the cross-section of the first annular groove 311 is arcuate. The radius of the arc is equal to the radius of the ball 331, and the central angle of the arc is slightly less than 180°. The ball 331 is partially embedded in the first annular groove 311, with the center of the ball 331 coinciding with the center of the arc. The surface of the ball 331 is in contact with the inner wall of the first annular groove 311.

[0063] The cross section of the second annular groove 321 is also arcuate and symmetrical with the cross section of the first annular groove 311 about the center of the ball 331. The ball 331 is partially embedded in the second annular groove 321, and the surface of the ball 331 is in contact with the inner wall of the second annular groove 321.

[0064] Due to the presence of the balls 331, the relative positions of the first and second ring bodies 31 and 32 are not easily changed, and have a high coaxiality. In addition, when the first ring body 31 rotates around the second ring body 32, there is rolling friction between the two, which has little resistance and little extra energy loss.

[0065] To further reduce the friction between the first ring body 31 and the second ring body 32, an oil filling hole is provided on the first ring body 31 or the second ring body 32. The oil filling hole is connected to the first annular groove 311 and the second annular groove 321, and grease can be injected into the first annular groove 311 and the second annular groove 321 through the oil filling hole.

[0066] In another embodiment of the present application, the bottoms of the first annular groove 311 and the second annular groove 321 are concave to form grooves for storing grease.

[0067] This embodiment also provides a power head for a rotary drilling rig, comprising the transmission box and a reducer. The output shaft of the reducer is connected to the input shaft 2 of the transmission box.

[0068] This embodiment also provides a rotary drilling rig, including the above-mentioned power head.

[0069] Example 3

[0070] See also Figure 4 , which is different from Example 2 in that the structures of the first ring body 31 , the second ring body 32 and the anti-overturning member 33 are different.

[0071] Specifically, a third annular groove 312 is formed on the inner sidewall of the first ring body 31 and is disposed along the circumference of the first ring body 31. Accordingly, an annular protrusion 322 is integrally formed on the outer sidewall of the second ring body 32 and is disposed along the circumference of the second ring body 32. The annular protrusion 322 is located within the third annular groove 312 and does not contact the inner wall of the third annular groove 312.

[0072] A plurality of first rollers 332 are disposed between the annular projection 322 and the side walls of the third annular groove 312. Each first roller 332 is arranged along the radial direction of the first ring body 31 and is arranged circumferentially along the first ring body 31. Furthermore, a plurality of second rollers 334 are disposed between the annular projection 322 and the bottom of the third annular groove 312. The axis of each second roller 334 is parallel to the axis of the first ring body 31 and is arranged circumferentially along the first ring body 31.

[0073] The anti-tilt member 33 is composed of two rows of first rollers 332 and a centrally located second roller 334. This prevents the relative position of the first and second ring bodies 31, 32 from changing, ensuring a high degree of coaxiality between the first and second ring bodies 31, 32. Furthermore, when the first ring body 31 rotates around the second ring body 32, rolling friction occurs between the two, resulting in low resistance and minimal energy loss.

[0074] Since the axial pressure between the first ring body 31 and the second ring body 32 is transmitted by two rows of first rollers 332, in order to make each first roller 332 evenly stressed and extend the service life of the first roller 332, the first rollers 332 need to be evenly distributed along the circumference of the first ring body 31.

[0075] Therefore, a retainer 333 is provided between the annular projection 322 and the two side walls of the third annular groove 312. Each first roller 332 is embedded in a pocket of the retainer 333. Under the restraint of the retainer 333, the first rollers 332 are always evenly distributed along the circumference of the first ring body 31.

[0076] Since the radial pressure between the first ring body 31 and the second ring body 32 is transmitted by the second rollers 334, in order to make each second roller 334 evenly stressed and extend the service life of the second rollers 334, the second rollers 334 need to be evenly distributed along the circumference of the first ring body 31.

[0077] To this end, a plurality of receiving grooves 313 are defined at the bottom of the third annular groove 312. The number of receiving grooves 313 is the same as the number of second rollers 334, and each receiving groove 313 is evenly distributed along the circumference of the first ring body 31. The second rollers 334 are embedded in corresponding receiving grooves 313 and are evenly distributed along the axis of the first ring body 31.

[0078] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0079] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0080] The above-described embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that variations and modifications are possible without departing from the scope of the present invention, and such variations and modifications are fully within the scope of protection of the present invention.

Claims

1. A transmission box, characterized in that: Applied to a power head, the transmission box includes: Box; An input shaft is rotatably connected to the housing via a connecting member, wherein the connecting member is a bearing; The slewing bearing comprises a first ring body and a second ring body, wherein the first ring body and the second ring body are rotatably engaged with each other, an anti-overturning member is provided between the first ring body and the second ring body, the first ring body is in driving engagement with the input shaft, and the second ring body is connected to the housing; and a sleeve connected to the first ring body; A third annular groove is provided on the wall of the first ring body facing the second ring body, an annular protrusion is provided on the wall of the second ring body facing the first ring body, the annular protrusion is located in the third annular groove, and the anti-overturning member includes a plurality of first rollers arranged between the annular protrusion and both side walls of the third annular groove, and the first rollers are arranged along the radial direction of the first ring body; A retainer is provided between the annular protrusion and both side walls of the third annular groove, and the retainer ensures that the first rollers are always evenly distributed along the circumference of the first ring body; The anti-overturning member further includes a plurality of second rollers arranged between the annular protrusion and the bottom of the third annular groove, and the axes of the second rollers are parallel to the axis of the first ring body.

2. The transmission box according to claim 1, characterized in that: The bottom of the third annular groove is provided with a plurality of The second rollers correspond to the receiving grooves, which are evenly distributed along the circumference of the second ring body, and the second rollers are embedded in the corresponding receiving grooves.

3. The transmission box according to claim 1, characterized in that: A gear transmission is formed between the first ring body and the input shaft, and the first ring body is integrally formed with external teeth.

4. A power head, used in rotary drilling rig, characterized in that: It comprises the transmission box and reducer according to any one of claims 1 to 3, wherein the input shaft is connected to the reducer.

5. A rotary drilling rig, characterized in that: Comprising the power head as claimed in claim 4.

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