Drill bit connecting structure of drilling guide device

Abstract

The drill bit connecting structure of the drilling guiding device comprises a bearing chamber and a connector used for being connected with a roller bit, the bearing chamber comprises a plurality of bearings and a bearing sleeve, and the bearings are arranged on a flexible rotating shaft side by side in a sleeving mode; the bearing sleeve is provided with an axially-through stepped hole, the end facing the connector is a first shaft hole, and the end away from the connector is a second shaft hole. The bearing cover is in threaded connection with the outer end of the first shaft hole and abuts against the outer ring end face, facing the connector, of the bearing. The connector is inserted into the shaft hole of the bearing cover and fixed to the end face of the flexible rotating shaft through a locking bolt. According to the flexible rotating shaft, the flexible rotating shaft is fixedly connected with the connector through the locking bolt, a split type structure is adopted to replace an existing flexible rotating shaft integrated structure design, the structure design is simplified on the whole, the manufacturing manufacturability and the use reliability are improved, and the use and maintenance cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of drilling guiding devices, and particularly relates to a bit connection structure of a drilling guiding device. Background Art

[0002] The drilling guiding device is an important operation tool for all-terrain horizontal directional drilling rigs. The rig drives the inner rod in the double-wall drill pipe to make the inner flexible rotating shaft of the guiding device drive the roller bit to break rocks, and supplies mud through the central channel of the inner rod to cool the bit and remove rock cuttings for construction on rock formations.

[0003] In the existing drilling guiding device, the roller bit is usually directly fixed at the end of the flexible rotating shaft. The outer sleeve on the flexible rotating shaft is rotationally matched with the flexible rotating shaft through a bearing chamber. Among them, deep groove ball bearings arranged side by side are provided in the bearing chamber. The bearing chamber needs to be filled with grease before installation, and oil needs to be regularly injected before and after drilling. The service life is short and the maintenance is extremely inconvenient. In addition, in order to prevent mud from entering the bearing chamber during construction, polyurethane sealing structures are respectively provided at both ends of the bearing chamber, resulting in a complex internal structure of the bit of the drilling guiding device, and the deep groove ball bearings and the polyurethane sealing structures are complex, with a short service life and high maintenance costs. Utility Model Content

[0004] In view of this, the present utility model provides a bit connection structure of a drilling guiding device to solve the problems of short service life, complex structure, and high maintenance cost in the prior art.

[0005] The bit connection structure of the drilling guiding device provided by the present utility model includes a bearing chamber sleeved on a flexible rotating shaft, and further includes a connection head for connecting a roller bit. The bearing chamber includes:

[0006] Multiple rows of thrust bearings sleeved on the flexible rotating shaft. The end of the multiple rows of thrust bearings facing the roller bit is the rear end, and the end away from the roller bit is the front end;

[0007] A bearing sleeve having a stepped hole axially penetrating therethrough. The end of the stepped hole facing the connection head is a first shaft hole, which is adapted to the outer diameter of the outer ring of the multiple rows of thrust bearings. The end of the stepped hole away from the connection head is a second shaft hole, and its inner diameter is larger than the diameter of the corresponding part of the flexible rotating shaft;

[0008] A bearing cover threadedly connected to the outer end of the first shaft hole. The inner end of the bearing cover abuts against the outer ring of the rear end of the multiple rows of thrust bearings;

[0009] One end of the connection head is inserted into the shaft hole of the bearing cover, and the two are rotationally matched and fixed to the end face of the flexible rotating shaft through a locking bolt.

[0010] For the drill bit connection structure of the above-mentioned drilling guidance device, the drill bit connector is fixed on the flexible rotating shaft through locking bolts. The split structure replaces the integral structure design of the flexible rotating shaft in the existing design, simplifies the overall structural design, improves the manufacturability and use reliability, and reduces the cost. Among them, the metal mating surfaces of the bearing cover and the connector replace the polyurethane sealing ring in the prior art, improving the service life.

[0011] In the above technical solution, preferably, the bearing adopts a multi-row thrust angular contact ball bearing, which has a more significant impact resistance. It is lubricated with drilling fluid, has a simple internal structure, and no longer requires frequent inspection and addition of bearing grease, greatly extending the service life of the bearing and making use and maintenance more convenient.

[0012] In the above technical solution, preferably, an inner bearing retainer is further provided on the flexible rotating shaft, which abuts against the inner ring at the front end of the multi-row thrust bearing. Further, the inner bearing retainer is of a split structure, is installed in the installation groove on the flexible rotating shaft, and is fixed by a snap ring. This structural form is convenient for assembly and reliable in performance.

[0013] In the above technical solution, preferably, an outer bearing retainer is further provided. The outer bearing retainer is sleeved on the inner bearing retainer and abuts against the outer ring at the front end of the multi-row thrust bearing. Further, hard alloy layers are respectively inlaid on the rotational mating surfaces of the inner bearing retainer and the outer bearing retainer, and on the rotational mating surface between the bearing cover and the connector, improving the wear resistance and extending the service life.

[0014] It can be seen from the above technical solutions that the drill bit connection structure of the drilling guidance device provided by the present utility model solves the problems of inconvenient use, complex structure, and high maintenance cost in the prior art. Compared with the prior art, the present utility model has the following beneficial effects:

[0015] The bearing chamber includes a bearing sleeve and a bearing cover threadedly connected to one end of the bearing sleeve. The multi-row thrust bearing is arranged in the bearing chamber and is sleeved side by side on the flexible rotating shaft. The flexible rotating shaft is fixedly connected to the connector through locking bolts, replacing the integral structure design of the flexible rotating shaft in the existing design, simplifying the overall structural design, improving the manufacturability and use reliability, and reducing the cost. Among them, the metal mating surface between the bearing cover and the connector replaces the rubber sealing ring in the prior art, improving the service life. Brief Description of the Drawings

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce and explain the drawings required for the description of the embodiments of the present invention or the prior art. Obviously, the drawings described below are only partial embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 Schematic diagram of the drill bit connection structure of the drilling guidance device provided by the present invention;

[0018] Figure 2 is Figure 1 Cross-sectional view of the drill bit connection structure of the shown drilling guidance device;

[0019] Figure 3 is Figure 1 Exploded schematic diagram of the drill bit connection structure of the shown drilling guidance device;

[0020] Figure 4 Schematic diagram of the bearing sleeve in the present invention;

[0021] Figure 5 is Figure 4 Cross-sectional view of the shown bearing sleeve.

[0022] Figures 1 - 5 In, the corresponding relationships of the components are as follows:

[0023] Bearing chamber 110, connection head 120, flexible rotating shaft 130;

[0024] Bearing sleeve 111, multi-row thrust bearing 112, bearing cover 113, bearing inner retaining ring 114, snap ring 115, bearing outer retaining ring 116, locking bolt 117;

[0025] First shaft hole 1111, second shaft hole 1112. Specific embodiments

[0026] The following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Obviously, the embodiments described below are only partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] In order to more clearly explain and illustrate the technical solutions and implementation manners of the present invention, the following introduces several preferred specific embodiments for implementing the technical solutions of the present invention.

[0028] It should be noted that the orientation terms such as "inner, outer", "front, back", and "left, right" in this text are expressed based on the product's usage state as the reference object. Obviously, the use of the corresponding orientation terms does not limit the protection scope of this solution.

[0029] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 , which is a schematic diagram of the drill bit connection structure of the drilling guidance device provided by the present utility model. Figure 2 is Figure 1 a sectional view of the drill bit connection structure of the drilling guidance device shown in Figure 3 is Figure 1 a schematic exploded view of the drill bit connection structure of the drilling guidance device shown in

[0030] As shown in Figure 1 , Figure 2 , Figure 3 , a drill bit connection structure of a drilling guidance device provided by the present utility model includes a bearing housing 110 and a connection head 120. The bearing housing 110 is sleeved on a flexible rotating shaft 130, and the connection head 120 is used to connect a roller cone bit (not shown in the figure).

[0031] The bearing housing 110 includes a bearing sleeve 111, multiple rows of thrust bearings 112, and a bearing cover 113. The multiple rows of thrust bearings 112 are arranged in the bearing sleeve 111. One end of the multiple rows of thrust bearings 112 facing the roller cone bit is the rear end, and the end far from the roller cone bit is the front end. The bearing cover 113 is arranged at the rear end of the multiple rows of thrust bearings 112. In this application, the multiple rows of thrust bearings 112 adopt multiple rows of thrust angular contact ball bearings, which have a more significant anti-impact ability compared with traditional deep groove radial ball bearings, greatly extending the service life of the bearings.

[0032] As shown in Figure 4 , Figure 5 , the bearing sleeve 111 has an axially through stepped hole. One end of the stepped hole facing the connection head 120 is a first shaft hole 1111, which is adapted to the outer diameter of the outer ring of the multiple rows of thrust bearings 112. The multiple rows of thrust bearings 112 are arranged in the first shaft hole 1111. The bearing cover 113 is threadedly connected to the outer end of the first shaft hole 1111 and abuts against the outer ring end face at the rear end of the multiple rows of thrust bearings 112 for limiting the outer ring of the bearing. One end of the stepped hole far from the connection head 120 is a second shaft hole 1112, whose inner diameter is larger than the diameter of the corresponding part of the flexible rotating shaft 130 to accommodate and connect the flexible rotating shaft 130.

[0033] A bearing inner retaining ring 114 is also provided on the flexible rotating shaft 130. The bearing inner retaining ring 114 is of a split structure, is embedded in the installation groove on the flexible rotating shaft 130, and is fixed on the flexible rotating shaft 130 through a snap ring 115. The bearing inner retaining ring 114 abuts against the inner ring at the front end of the multi-row thrust bearings 112 and is used for limiting the inner ring of the bearing.

[0034] In the solution of this application, a bearing outer retaining ring 116 is also provided. The bearing outer retaining ring 116 is arranged around the outer circumferential surface of the bearing inner retaining ring 114, and the bearing outer retaining ring 116 abuts against the outer ring at the front end of the multi-row thrust bearings 112. Wherein, hard alloy layers are respectively inlaid on the rotating mating surfaces of the bearing inner retaining ring 114 and the bearing outer retaining ring 116, so as to improve the anti-wear ability and have a long service life.

[0035] One end of the connector 120 away from the roller bit is inserted into the shaft hole of the bearing cover 113 and is fixed to the end face of the flexible rotating shaft 130 through a locking bolt 117. The connector 120 and the bearing cover 113 are in rotational fit, and hard alloy layers are respectively inlaid on the rotational mating surfaces between the two, so as to improve the anti-wear ability and have a long service life.

[0036] Based on the description of the above specific embodiments, the drill bit connection structure of the drilling guiding device provided by the present utility model has the following advantages compared with the prior art:

[0037] First, a connector is added and fixed to the end face of the flexible rotating shaft through a locking bolt, replacing the integral structure design of the flexible rotating shaft in the existing design, simplifying the manufacturing process and reducing the manufacturing cost.

[0038] Second, the bearing chamber structure is optimized. On the one hand, the rotational mating surfaces of the bearing cover and the connector are used to replace the rubber sealing ring in the prior art, improving the service life; on the other hand, thrust angular contact ball bearings are used to replace deep groove ball bearings, improving the life of the bearings. In particular, it is not necessary to frequently detect and add lubricating grease to the bearings, which is more convenient to use and has low maintenance costs.

[0039] Third, the bearing inner retaining ring is of a split structure, is embedded in the installation groove on the flexible rotating shaft, and is fixed through a snap ring, which is convenient for assembly.

[0040] Fourth, the overall structure design is simplified, the manufacturing processability and use reliability are improved, and the cost is reduced.

[0041] Finally, it should also be noted that the term "comprising", "including" or any other variant thereof used in this text is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0042] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone should know that structural changes made under the inspiration of the present utility model, as long as they have the same or similar technical solutions as the present utility model, all fall within the protection scope of the present utility model.

Claims

1. A drill bit connection structure of a drilling guide device, comprising a bearing chamber, sleeved on a flexible rotating shaft, characterized in that: It also includes a connector for connecting a roller drill bit, and the bearing chamber includes: A multi-row thrust bearing is sleeved on the flexible rotating shaft, wherein the end of the multi-row thrust bearing facing the roller drill bit is the rear end, and the end away from the roller drill bit is the front end; The bearing sleeve has a stepped hole axially extending therethrough, the end of the stepped hole facing the connector is a first axial hole, which is adapted to the outer ring diameter of the multi-row thrust bearing, the multi-row thrust bearing is arranged in the first axial hole, and the end of the stepped hole away from the connector is a second axial hole, the inner diameter of which is larger than the diameter of the corresponding portion of the flexible rotating shaft; A bearing cap, threadedly connected to the outer end of the first shaft hole, the inner end of the bearing cap abutting against the outer ring of the rear end of the multi-row thrust bearing; One end of the connector is inserted into the shaft hole of the bearing cover, the two are rotationally matched, and are fixed to the end surface of the flexible rotating shaft by a locking bolt.

2. The drill bit connection structure of the drilling guide device according to claim 1, characterized in that: The bearing adopts a multi-row thrust angular contact ball bearing.

3. The drill bit connection structure of the drilling guide device according to claim 1, characterized in that: The flexible rotating shaft is also provided with a bearing inner retaining ring which abuts against the inner ring at the front end of the multi-row thrust bearing.

4. The drill bit connection structure of the drilling guide device according to claim 3, characterized in that: The inner retaining ring of the bearing is a two-half structure, embedded in the mounting groove on the flexible rotating shaft, and fixed by a clamping ring.

5. The drill bit connection structure of the drilling guide device according to claim 3, characterized in that: A bearing outer retaining ring is also provided, which is sleeved with the bearing inner retaining ring and abuts against the outer ring at the front end of the multi-row thrust bearing.

6. The drill bit connection structure of the drilling guide device according to claim 5, characterized in that: The rotational matching surfaces of the inner retaining ring of the bearing and the outer retaining ring of the bearing, as well as the rotational matching surfaces of the bearing cover and the connecting head are respectively inlaid with hard alloy layers.

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