Drilling guide device

Abstract

The utility model discloses a drilling guide device which comprises a connecting structure and a device body, the device body comprises a shell and a bent connector arranged at the front end of the shell, a flexible rotating shaft penetrates through the shell and the bent connector, and one end of the flexible rotating shaft is used for being connected with an inner driving shaft of a drilling machine or an inner rod of a drill rod; the flexible rotating shaft is provided with a drilling fluid passing hole which is axially arranged in a penetrating mode, and drilling fluid is conveyed to the roller bit through the drilling fluid passing hole. According to the utility model, the traditional structural design that drilling fluid is input through a bent joint and a radial hole in the flexible rotating shaft is changed, on one hand, the rear end of the flexible rotating shaft is not of a solid structure any more, the material consumption is reduced, and the cost is reduced; on the other hand, the bottleneck that the radial hole cannot be too large is eliminated, and the conveying amount of drilling fluid is increased.

Description

Technical Field

[0001] The present application relates to the technical field of drilling devices for horizontal directional drilling rigs, and in particular to a drilling guide device. Background Art

[0002] The drilling guide device is an important operating tool of the horizontal directional drilling rig. It is used to cooperate with the drilling fluid motor to supply drilling fluid to the roller drill bit through the shaft hole on the flexible rotating shaft to carry out construction in rock formations.

[0003] Chinese utility model patent CN 207776789 U discloses a rock drilling guide device, including a drill bit outer body, a drill bit inner body and a roller drill bit. The drill bit outer body includes a bent joint, a cavity and a bearing chamber. The rear end of the bent joint is fixed to one end of the cavity, and the other end of the cavity is fixed to the bearing chamber. A probe is installed in the side of the cavity. The probe is connected to a control device located on the ground through a wireless transmitter. There is an angle of 2° between the axis of the bent joint and the axis of the cavity. The cavity is coaxial with the bearing chamber. The drill bit inner body includes a rotating shaft. One end of the rotating shaft passes through the bent joint, the cavity, and the bearing chamber in sequence and is fixed to the rotating seat of the roller drill bit. The other end is connected to the inner drill rod of the drilling rig through a hexagonal sleeve. This solution has the following problems:

[0004] First, the rotating shaft is directly connected to the roller drill bit, wherein the rotating shaft is an integrated structure, the connecting end (rear end) with the inner drill rod is a solid structure, and the connecting end (front end) with the roller drill bit has a large diameter, the overall weight is large, the manufacturing processability is poor, and the manufacturing cost is high.

[0005] Second, the drilling fluid delivery structure is unreasonable. There is an axial hole at the front end of the rotating shaft, which is connected to the cavity between the rotating shaft and the outer body of the drill bit through the radial hole. The drilling fluid enters the cavity between the rotating shaft and the outer body of the drill bit through the elbow joint, and then is delivered to the roller drill bit through the axial hole at the front end of the rotating shaft for spraying. Since the diameter of the radial hole cannot be very large, the delivery amount of the drilling fluid is limited. Utility Model Content

[0006] In view of this, the utility model provides a drilling guide device to solve the problems of the prior art such as large overall weight, poor manufacturing processability, high manufacturing cost and unreasonable drilling fluid conveying structure.

[0007] The utility model provides a drilling guide device, comprising a connecting structure and a device body, wherein the device body comprises an outer shell and a bent joint arranged at the front end of the outer shell, a flexible rotating shaft passes through the outer shell and the bent joint, one end of the flexible rotating shaft is used to connect to the inner drive shaft of the drilling rig or the inner drill rod of the drill rod, and the other end is used to connect to the roller drill bit, the flexible rotating shaft is coaxially arranged with the outer shell, the flexible rotating shaft and the bent joint form an angle for arc-forming a hole, and the flexible rotating shaft has a drilling fluid through hole axially penetrating therethrough, and the drilling fluid is transported from the drilling fluid through hole to the roller drill bit.

[0008] In the above drilling guide device, the flexible rotating shaft has a drilling fluid through hole axially penetrated, and the drilling fluid is delivered to the roller drill bit from the drilling fluid through hole, which changes the traditional structural design of inputting drilling fluid through the radial hole on the bent joint and the flexible rotating shaft. On the one hand, the rear end of the flexible rotating shaft is no longer a solid structure, which reduces the material consumption and reduces the cost; on the other hand, it eliminates the bottleneck of the radial hole not being too large, thereby increasing the delivery rate of the drilling fluid.

[0009] In the above technical solution, preferably, the connection structure includes a bearing chamber and a connector for connecting a roller drill bit, the bearing chamber is sleeved on the flexible rotating shaft and is threadedly connected to the front end of the housing, the end of the bearing chamber facing the connector is the rear end, and the end away from the connector is the front end, and the bearing chamber includes:

[0010] A multi-row thrust bearing is sleeved on the flexible rotating shaft;

[0011] 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;

[0012] 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;

[0013] 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.

[0014] In this embodiment, the flexible rotating shaft is fixedly connected to the connector by a locking bolt, and the split structure replaces the existing flexible rotating shaft integrated structure design, which simplifies the structural design as a whole, improves the manufacturing process and reliability, and reduces the cost. Among them, the metal mating surface between the bearing cover and the connector replaces the rubber sealing ring in the prior art, which increases the service life.

[0015] In the above technical solution, preferably, a cavity is provided on the outer surface of the shell, the probe is arranged in the cavity, strip grooves are respectively provided at both ends of the cavity, through holes are provided on the outer surface of the cavity that vertically penetrate the two side walls of the strip grooves, strip blocks that match the strip grooves are respectively provided at both ends of the cover plate, through holes that match the through holes are provided on the strip blocks, the strip blocks are respectively inserted into the strip grooves, the pins pass through the through holes and the through holes on the strip blocks to hinge them, and the cover plate is fixed to the open end of the cavity by bolts. In this way, any one of the pins can be removed, and the other pin can be used as a hinge shaft to lift the cover plate and replace the probe, without the need to place the cover plate in a harsh construction site, which is convenient for subsequent capping installation operations.

[0016] In the above technical solution, preferably, the pin is a tubular structure, and a through groove is provided on the side wall along the axial direction. During the insertion process of the pin, it can be radially contracted to facilitate insertion.

[0017] In the above technical solution, preferably, the two ends of the probe are respectively provided with a first adjustment sleeve and a second adjustment sleeve. With such a design, the probes with different functions and lengths can be adapted by replacing the first adjustment sleeve and the second adjustment sleeve of different lengths according to actual needs to meet the needs of different working conditions.

[0018] In the above technical solution, preferably, the bearing adopts a thrust angular contact ball bearing, which has more significant impact resistance, greatly prolongs the service life of the bearing, and does not require frequent inspection and addition of bearing grease, making it more convenient to use.

[0019] In the above technical solution, preferably, the flexible rotating shaft is also provided with a bearing inner retaining ring, which abuts against the inner ring of the front end of the multi-row thrust bearing. Furthermore, the bearing inner retaining ring is a two-half structure, embedded in the mounting groove on the flexible rotating shaft, and fixed by a clamping ring. This structural form is easy to assemble and has reliable performance.

[0020] In the above technical solution, preferably, a bearing outer retaining ring is further provided, the bearing outer retaining ring is sleeved with the bearing inner retaining ring, and abuts against the outer ring of the front end of the multi-row thrust bearing. Furthermore, a hard alloy layer is inlaid on the rotating mating surface of the bearing inner retaining ring and the bearing outer retaining ring, and on the rotating mating surface of the bearing cover and the connector, respectively, to improve the wear resistance and extend the service life.

[0021] It can be seen from the above technical solutions that the drilling guide device provided by the utility model solves the problems of the prior art, such as large overall weight, poor manufacturing processability, high manufacturing cost, and unreasonable drilling fluid delivery structure. Compared with the prior art, the utility model has the following beneficial effects:

[0022] The flexible rotating shaft has a drilling fluid through hole axially penetrating therethrough, through which the drilling fluid is delivered to the roller drill bit, thereby changing the traditional structural design of inputting the drilling fluid through the radial holes on the bent joint and the flexible rotating shaft. On the one hand, the rear end of the flexible rotating shaft is no longer a solid structure, thus reducing the amount of material used and the cost; on the other hand, the bottleneck of the radial hole not being too large is eliminated, thereby increasing the delivery rate of the drilling fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce and illustrate the drawings required for use in the embodiments of the utility model or the description of the prior art. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of a drilling guide device provided by the utility model;

[0025] Figure 2 for Figure 1 The exploded structural diagram of the drilling guide device shown;

[0026] Figure 3 for Figure 1 A cross-sectional view of the drilling guide device shown;

[0027] Figure 4 It is a schematic diagram of the connection structure in the utility model;

[0028] Figure 5 for Figure 4 A cross-sectional view of the connection structure shown;

[0029] Figure 6 for Figure 4 A schematic diagram of the exploded structure of the connection structure shown;

[0030] Figure 7 It is a schematic diagram of the bearing sleeve in the utility model;

[0031] Figure 8 for Figure 7 A cross-sectional view of the bearing sleeve shown;

[0032] Fig. 9 It is a schematic diagram of the exploded structure of the housing in the utility model;

[0033] Fig.10 for Fig. 9 A magnified view of part A in FIG.

[0034] Fig.11It is a cross-sectional view of the shell in the utility model.

[0035] Figure 1-Figure 11 In the figure, the corresponding relationship of the parts is as follows:

[0036] Connecting structure 100, device body 200;

[0037] Bearing chamber 110, connector 120, flexible rotating shaft 130;

[0038] 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;

[0039] A first axial hole 1111, a second axial hole 1112;

[0040] The drilling fluid passes through the hole 131;

[0041] Shell 210, elbow 220;

[0042] Cavity 211, probe 212, cover plate 213, pin 214, first adjustment sleeve 215, second adjustment sleeve 216;

[0043] Strip groove 2111 , through hole 2112 , strip block 2131 , through groove 2141 . DETAILED DESCRIPTION

[0044] The following will be combined with the drawings of the embodiments of the utility model to clearly and completely describe the technical solutions of the embodiments of the utility model. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] In order to more clearly explain and illustrate the technical solution and implementation of the present utility model, several preferred specific embodiments for implementing the technical solution of the present utility model are introduced below.

[0046] It should be noted that the directional words such as "inside, outside", "front, back" and "left, right" in this article are expressed based on the product usage status. Obviously, the use of the corresponding directional words does not constitute a limitation on the protection scope of this scheme.

[0047] like Figure 1 , Figure 2 , Figure 3As shown, the utility model provides a drilling guide device, including a connecting structure 100 for connecting a roller drill bit (not shown in the figure) and a device body 200 arranged at the front end of the connecting structure 100, and a flexible rotating shaft 130 is arranged in the device body 200.

[0048] The device body 200 includes a housing 210 and a bent joint 220 disposed at the front end of the housing 210. The flexible rotating shaft 130 is disposed through the housing 210 and the bent joint 220. One end of the flexible rotating shaft 130 is used to connect to the inner drive shaft of the drilling rig or the inner drill rod of the drill rod, and the other end is used to connect to the roller drill bit. In the present application, the end of the drilling guide device used to connect to the inner drive shaft of the drilling rig or the inner drill rod of the drill rod is called the front end, and the end used to connect to the roller drill bit is called the rear end.

[0049] In the present application, the flexible rotating shaft 130 has a drilling fluid through hole 131 axially extending therethrough, and the drilling fluid is delivered to the roller bit through the drilling fluid through hole 131. The flexible rotating shaft 130 is coaxially arranged with the housing 210, and forms an angle of about 2 degrees with the elbow 220 to realize arc-forming holes. Usually, the angle does not exceed 3 degrees.

[0050] The present application scheme adopts an axially penetrating drilling fluid hole 131 to deliver drilling fluid to the roller drill bit, changing the traditional structural design of inputting drilling fluid through the radial holes on the bent joint 220 and the flexible rotating shaft. On the one hand, the rear end of the flexible rotating shaft is no longer a solid structure, which reduces the material consumption and reduces the cost; on the other hand, it eliminates the bottleneck of the radial hole not being too large, increases the delivery rate of drilling fluid, and allows the diameter of the drilling fluid hole 131 to be larger, further increasing the delivery rate of drilling fluid.

[0051] like Figure 4 , Figure 5 , Figure 6 As shown, the connection structure 100 includes a bearing chamber 110 and a connector 120. The bearing chamber 110 is sleeved on the flexible rotating shaft 130 and is threadedly connected to the front end of the housing 210. The connector 120 is used to connect a roller drill bit (not shown in the figure).

[0052] The bearing chamber 110 includes a bearing sleeve 111, a multi-row thrust bearing 112 and a bearing cover 113. The multi-row thrust bearing 112 is arranged in the bearing sleeve 111, and the bearing cover 113 is arranged at the rear end of the multi-row thrust bearing 112. In the present application, the multi-row thrust bearing 112 adopts a thrust angular contact ball bearing, which has a more significant impact resistance compared with a traditional deep groove radial ball bearing, and greatly prolongs the service life of the bearing.

[0053] like Figure 7 , Figure 8As shown, the bearing sleeve 111 has a stepped hole axially penetrating therethrough, and the end of the stepped hole facing the connector 120 is a first axial hole 1111, which is adapted to the outer ring diameter of the bearing 112. The multi-row thrust bearing 112 is arranged in the first axial hole 1111, and the bearing cover 113 is threadedly connected to the outer end of the first axial hole 1111 and abuts against the outer ring end face of the rear end of the multi-row thrust bearing 112, which is used to limit the outer ring of the bearing. The end of the stepped hole away from the connector 120 is a second axial hole 1112, whose inner diameter is larger than the diameter of the corresponding part of the flexible rotating shaft 130, so as to pass and connect the flexible rotating shaft 130.

[0054] The flexible rotating shaft 130 is also provided with a bearing inner retainer ring 114, which is a two-part structure, embedded in the mounting groove on the flexible rotating shaft 130, and fixed to the flexible rotating shaft 130 through a snap ring 115. The bearing inner retainer ring 114 abuts against the inner ring of the front end of the multi-row thrust bearing 112, and is used to limit the inner ring of the bearing.

[0055] In the present application, a bearing outer retaining ring 116 is further provided, and 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 of the front end of the multi-row thrust bearing 112. Among them, the rotating mating surfaces of the bearing inner retaining ring 114 and the bearing outer retaining ring 116 are respectively inlaid with a hard alloy layer to improve the wear resistance and prolong the service life.

[0056] The end of the connector 120 facing the driving end is inserted into the shaft hole of the bearing cover 113 and fixed to the end surface of the flexible rotating shaft 130 by means of the locking bolt 117. It can be seen that the present application adopts a split assembly structure, replacing the existing flexible rotating shaft integrated structure design, simplifying the structure, improving the manufacturing process, and reducing the manufacturing cost.

[0057] In the present application, a through hole 131 is provided on the outer wall of the flexible rotating shaft 130. The through hole 131 is an inclined hole, which is inclined toward the direction of the multi-row thrust bearing 112. Therefore, during operation, the drilling fluid in the hole can enter the multi-row thrust bearing 112 through the through hole and the gap between the bearing inner retaining ring 114 and the bearing outer retaining ring 116 for lubrication. There is no need to frequently add grease for maintenance, which is easy to use and reduces maintenance costs.

[0058] A probe is usually set on the drilling guide device to detect the angle and clock direction of the excavation. Fig. 9 , Fig.10 , Fig.11 As shown, in the solution of the present application, a cavity 211 is provided on the outer surface of the housing 210 , a probe 212 is disposed in the cavity 211 , and an open end of the cavity 211 is covered by a cover plate 213 .

[0059] Different from the conventional design where the cover is fixed directly by bolts, the present application provides strip grooves 2111 at both ends of the cavity 211, and the outer surface of the cavity 211 is provided with through holes 2112 vertically penetrating the two side walls of the strip groove 2111. The cover 213 is provided with strip blocks 2131 matching the strip groove 2111 at both ends, and the strip blocks 2131 are provided with through holes matching the through holes 2112. The strip blocks 2131 are respectively inserted into the strip grooves 2111, and the pins 214 pass through the through holes 2112 and the strip blocks 2131 to hinge them, and the cover 213 is fixed to the open end of the cavity 211 by bolts.

[0060] In the present application, the pin 214 is a tubular structure, and a through groove 2141 communicating with the inner cavity is axially provided on the side wall. With this design, the pin 214 can be radially contracted to a certain extent, which facilitates the insertion of the pin 214.

[0061] In the present application, after removing the fixing bolts of the cover 213, any one of the pins 214 can be removed, and the other pin 214 can be used as a hinge to lift up the cover 213 and replace the probe 212. There is no need to place the cover 213 in a harsh construction site, which facilitates subsequent cover installation operations.

[0062] In addition, in the present application, the two ends of the probe 212 are respectively provided with a first adjustment sleeve 215 and a second adjustment sleeve 216. With such a design, the probes 212 of different lengths can be adapted by replacing the first adjustment sleeve 215 and the second adjustment sleeve 216 of different lengths according to actual needs to meet the needs of different working conditions.

[0063] Based on the description of the above specific embodiments, the drilling guide device provided by the utility model has the following advantages compared with the prior art:

[0064] First, the flexible rotating shaft has a drilling fluid through hole axially penetrating therethrough, through which the drilling fluid is delivered to the roller drill bit, thereby changing the traditional structural design of inputting the drilling fluid through the radial holes on the bent joint and the flexible rotating shaft. On the one hand, the rear end of the flexible rotating shaft is no longer a solid structure, thus reducing the amount of material used and the cost; on the other hand, the bottleneck of the radial hole not being too large is eliminated, thereby increasing the delivery rate of the drilling fluid.

[0065] Secondly, the design of the flexible rotating shaft is optimized, and a split assembly structure is adopted to replace the existing integrated structure design of the flexible rotating shaft, which improves the manufacturing process and reduces the manufacturing cost.

[0066] Third, the structural design is simplified as a whole, and the reliability of use is improved.

[0067] Fourth, the bearing chamber structure is optimized, and the rotating mating surfaces of the inner and outer rings of the bearings, as well as the rotating mating surfaces of the bearing cap and the connector are provided with hard alloy layers, and the rubber seal ring in the prior art is replaced by axial metal fitting, which increases the service life; on the other hand, the deep groove radial ball bearing is replaced by the thrust angular contact ball bearing, which increases the life of the bearing. In particular, there is no need to frequently check and add grease to the bearings, which is more convenient to use and has low maintenance costs.

[0068] Finally, it should be noted that the terms "comprises", "includes" or any other variants thereof as used herein are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0069] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone should be aware of the structural changes made under the inspiration of the present invention. All technical solutions that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A drilling guide device, comprising a connecting structure and a device body arranged at the front end of the connecting structure, characterized in that: The device body includes an outer shell and a bent joint arranged at the front end of the outer shell, a flexible rotating shaft passes through the outer shell and the bent joint, one end of the flexible rotating shaft is used to connect to the inner drive shaft of the drilling rig or the inner drill rod of the drill rod, and the other end is used to connect to the roller drill bit, the flexible rotating shaft is coaxially arranged with the outer shell, the flexible rotating shaft and the bent joint form an angle for arc-forming a hole, and the flexible rotating shaft has a drilling fluid through hole axially penetrated, and the drilling fluid is transported to the roller drill bit from the drilling fluid through hole.

2. The drilling guide device according to claim 1, characterized in that: The connection structure includes a bearing chamber and a connector for connecting a roller drill bit. The bearing chamber is sleeved on the flexible rotating shaft and is threadedly connected to the front end of the housing. The end of the bearing chamber facing the connector is the rear end, and the end away from the connector is the front end. The bearing chamber includes: A multi-row thrust bearing is sleeved on the flexible rotating shaft; 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.

3. The drilling guide device according to claim 1, characterized in that: A cavity is provided on the outer surface of the shell, and the probe is arranged in the cavity. Strip grooves are respectively opened at both ends of the cavity, and through holes are provided on the outer surface of the cavity which vertically penetrate the two side walls of the strip grooves. Strip blocks adapted to the strip grooves are respectively provided at both ends of the cover plate, and through holes adapted to the through holes are provided on the strip blocks. The strip blocks are respectively inserted into the strip grooves, and a pin shaft passes through the through holes and the through holes on the strip blocks to hinge them, and the cover plate is fixed to the open end of the cavity by bolts.

4. The drilling guide device according to claim 3, characterized in that: The pin shaft is a tubular structure, and a through groove is provided on the side wall along the axial direction.

5. The drilling guide device according to claim 3, characterized in that: The two ends of the probe are respectively sleeved with a first adjustment sleeve and a second adjustment sleeve.

6. The drilling guide device according to claim 2, characterized in that: The bearing adopts a thrust angular contact ball bearing.

7. The drilling guide device according to claim 2, 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.

8. The drilling guide device according to claim 7, 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.

9. The drilling guide device according to claim 7, 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.

10. The drilling guide device according to claim 9, 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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