Casing Drilling Tools and Rotary Drilling Rigs

Abstract

The embodiments of the present invention provide a pipe-following drill and a rotary drilling rig, and relate to the technical field of rotary drilling rigs. The pipe-following drill comprises a drilling tool body, a main shaft, a first rotating cutting plate and a second rotating cutting plate. The main shaft is arranged on the drilling tool body and is used to install a drill bit; the first rotating cutting plate and the second rotating cutting plate are centrally symmetrical about the main shaft. The first rotating cutting plate and the second rotating cutting plate rotate along a first direction so that the first rotating cutting plate and the second rotating cutting plate are exposed to the outside of the casing; the first rotating cutting plate and the second rotating cutting plate rotate along a second direction so that the first rotating cutting plate and the second rotating cutting plate are retracted to the inside of the casing. The pipe-following drill can not only realize hole expansion drilling, reduce the friction resistance during the casing lowering process, and reduce the over-square phenomenon of the project, but also realize phased soil extraction and cyclic operation.

Description

Technical Field

[0001] The invention relates to the technical field of rotary drilling rigs, and in particular to a pipe-following drill tool and a rotary drilling rig. Background Art

[0002] Rotary drilling rigs need to use different drilling tools and construction methods for different geological conditions. Long casing or full casing must be used to protect the wall in silty clay that is easy to shrink, loose miscellaneous fill and sand layers that are easy to collapse, and severely permeable formations. During the construction of long casing, the diameter of the upper casing and the drilling tool are different, resulting in poor consistency between the upper and lower diameters of the cast-in-place piles. There is often an over-square phenomenon in the project, and it is impossible to achieve phased soil extraction and cyclic operation. Summary of the invention

[0003] The objectives of the present invention include, for example, providing a pipe-following drill and a rotary drilling rig, which can improve the upper and lower consistency of the diameter of the cast-in-place pile, can not only realize hole expansion drilling, reduce the friction resistance during the casing lowering process, reduce the engineering over-square phenomenon, but also realize phased soil extraction and cyclic operation.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, an embodiment of the present invention provides a pipe drilling tool, which is used in a casing; the pipe drilling tool comprises a drilling tool body, a main shaft, a first rotating cutting plate and a second rotating cutting plate, wherein the main shaft is arranged on the drilling tool body and is used to install a drill bit; the first rotating cutting plate and the second rotating cutting plate are centrally symmetrical about the main shaft;

[0006] The first rotating cutting plate and the second rotating cutting plate rotate in a first direction so that the first rotating cutting plate and the second rotating cutting plate are exposed to the outside of the protective tube; the first rotating cutting plate and the second rotating cutting plate rotate in a second direction so that the first rotating cutting plate and the second rotating cutting plate are retracted to the inside of the protective tube.

[0007] In an optional embodiment, a first rotating shaft and a second rotating shaft are provided on the drill tool body, the first rotating shaft is connected to the first rotating cutting plate for driving the first rotating cutting plate to rotate; the second rotating shaft is connected to the second rotating cutting plate for driving the second rotating cutting plate to rotate.

[0008] In an optional embodiment, the first rotating shaft and the second rotating shaft are centrally symmetric with respect to the main axis.

[0009] In an optional embodiment, the first rotating shaft is welded to the first rotating cutting plate, and the second rotating shaft is welded to the second rotating cutting plate.

[0010] In an optional embodiment, a first limit member and a second limit member are provided on the drill tool body, the first limit member is connected to the first rotating cutting plate, and is used to limit the rotation range of the first rotating cutting plate; the second limit member is connected to the second rotating cutting plate, and is used to limit the rotation range of the second rotating cutting plate.

[0011] In an optional embodiment, a fixed base plate is provided on the drill tool body, and the first limiting member and the second limiting member are provided on the fixed base plate; a first limiting groove is provided on the first rotating cutting plate, and a second limiting groove is provided on the second rotating cutting plate, and the first limiting member can be movably clamped in the first limiting groove, and the second limiting member can be movably clamped in the second limiting groove.

[0012] In an optional embodiment, the first limiting groove and the second limiting groove are arc grooves respectively.

[0013] In an optional embodiment, the first rotating cutting plate includes a first end portion and a second end portion connected to each other, the first rotating cutting plate rotates along the first direction so that the first end portion is exposed outside the casing; the first rotating cutting plate rotates along the second direction so that the first end portion is retracted to the inside of the casing;

[0014] The second rotating cutting plate includes a third end and a fourth end connected to each other, the second rotating cutting plate rotates along the first direction so that the third end is exposed outside the protective sleeve; the second rotating cutting plate rotates along the second direction so that the fourth end is retracted to the inside of the protective sleeve.

[0015] In an optional embodiment, the first end portion and the third end portion are respectively provided with a cutting guide plate.

[0016] In a second aspect, an embodiment of the present invention provides a rotary drilling rig, comprising a power mechanism and a pipe-following drill tool as described in any one of the aforementioned embodiments, wherein the power mechanism is connected to the drill tool body.

[0017] The pipe drilling tool comprises a drilling tool body, a main shaft, a first rotating cutting plate and a second rotating cutting plate. The main shaft is arranged on the drilling tool body and is used to install a drill bit. The first rotating cutting plate and the second rotating cutting plate are centrally symmetrical about the main shaft.

[0018] The first rotating cutting plate and the second rotating cutting plate rotate in a first direction so that the first rotating cutting plate and the second rotating cutting plate are exposed to the outside of the protective tube; the first rotating cutting plate and the second rotating cutting plate rotate in a second direction so that the first rotating cutting plate and the second rotating cutting plate are retracted to the inside of the protective tube.

[0019] The beneficial effects of the embodiments of the present invention include, for example:

[0020] The pipe-following drill provided by the embodiment of the present invention has a symmetrical first rotating cutting plate and a second rotating cutting plate arranged on the drill body. When the first rotating cutting plate and the second rotating cutting plate rotate in the first direction so that the first rotating cutting plate and the second rotating cutting plate are exposed to the outside of the casing; the first rotating cutting plate and the second rotating cutting plate rotate in the second direction so that the first rotating cutting plate and the second rotating cutting plate are retracted to the inside of the casing, that is, the first rotating cutting plate and the second rotating cutting plate rotate in different directions, and the relative position with the casing changes to realize variable diameter rotation. When the first rotating cutting plate and the second rotating cutting plate of the pipe-following drill are exposed to the outside of the casing, the hole expansion drilling can be realized, the friction resistance in the process of lowering the casing can be reduced, and the over-square phenomenon of the project can be reduced. When the first rotating cutting plate and the second rotating cutting plate are retracted to the inside of the casing, the soil can be taken in batches and the cycle operation can be realized.

[0021] The rotary drilling rig provided by the embodiment of the present invention includes the above-mentioned pipe-following drilling tool, which can not only realize hole expansion drilling, reduce the friction resistance during the casing lowering process, and reduce the engineering over-square phenomenon, but also realize phased soil extraction and cyclic operation, greatly improving the construction quality and construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of the application scenario structure of the pipe-following drill provided in a specific embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the application structure of a pipe-following drill provided by a specific embodiment of the present invention from a first perspective;

[0025] Figure 3 A schematic diagram of the application structure of the pipe-following drill bit from a second perspective provided in a specific embodiment of the present invention.

[0026] Icons: 100-tube drilling tool; 200-casing; 110-drill tool body; 120-spindle; 121-drill bit; 130-first rotating cutting plate; 131-first rotating shaft; 132-first limiting groove; 133-first end; 135-second end; 140-second rotating cutting plate; 141-second rotating shaft; 142-second limiting groove; 143-third end; 145-fourth end; 150-fixed bottom plate; 151-first limiting member; 152-second limiting member; 161-cutting guide plate; 163-rotary excavation tooth. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] 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, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0032] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0033] When the rotary drilling rig is working in silty clay that is easy to shrink, loose miscellaneous fill and sand layers that are easy to collapse, and severely permeable strata, it is necessary to use long casing or full casing to protect the wall to prevent the hole wall from collapsing. During the casing construction process, due to the difference in the diameter of the hole formed by the upper casing and the drill bit, the upper and lower consistency of the cast-in-place pile diameter is poor, and the over-square phenomenon often occurs in the project. In order to solve the problems in the prior art, the embodiment of the present invention proposes a follow-up drill 100 applied to the casing 200, which can effectively reduce the over-square problem.

[0034] Figure 1 For a schematic diagram of the application scenario structure of the pipe drilling tool 100 provided in a specific embodiment of the present invention, please refer to Figure 1 .

[0035] The present embodiment provides a pipe drilling tool 100, which is applied to the casing 200. The pipe drilling tool 100 includes a drilling tool body 110, a main shaft 120, a first rotating cutting plate 130 and a second rotating cutting plate 140. The main shaft 120 is arranged on the drilling tool body 110 and is used to install a drill bit 121. The first rotating cutting plate 130 and the second rotating cutting plate 140 are centrally symmetrical about the main shaft 120. In this embodiment, the first rotating cutting plate 130 and the second rotating cutting plate 140 are symmetrically arranged, and the force is balanced during the rotation process, and the structure is more stable. The first rotating cutting plate 130 and the second rotating cutting plate 140 rotate along the first direction, and under the push of the resistance of the rock and soil, the first rotating cutting plate 130 and the second rotating cutting plate 140 are exposed to the outside of the casing 200, so that the diameter of the rotary drilling hole is larger than the diameter of the casing 200, which plays a role in expanding the aperture. Under this working condition, it is convenient to drill with the pipe, reduce the friction resistance during the lowering process of the casing 200, and reduce the engineering over-square phenomenon. The first rotary cutting plate 130 and the second rotary cutting plate 140 rotate in the second direction, and are pushed by the resistance of the rock and soil to retract the first rotary cutting plate 130 and the second rotary cutting plate 140 to the inner side of the casing 200. At this time, the overall outer dimensions of the pipe drill 100 become smaller, consistent with the drill body 110, and smaller than the diameter of the casing 200, so that it can move up and down inside the casing 200 more easily, and realize the step-by-step soil extraction and cyclic operation. The pipe drill 100 can not only realize the hole expansion drilling, reduce the friction resistance during the lowering process of the casing 200, and reduce the over-square phenomenon of the project, but also realize the step-by-step soil extraction and cyclic operation, which greatly improves the construction quality and efficiency of the rotary drilling rig.

[0036] Optionally, a first rotating shaft 131 and a second rotating shaft 141 are provided on the drilling tool body 110. The first rotating shaft 131 is connected to the first rotating cutting plate 130 to drive the first rotating cutting plate 130 to rotate; the second rotating shaft 141 is connected to the second rotating cutting plate 140 to drive the second rotating cutting plate 140 to rotate. Further, the first rotating shaft 131 is welded to the first rotating cutting plate 130, and the second rotating shaft 141 is welded to the second rotating cutting plate 140. The welding method can improve the structural strength and connection reliability, reduce the failure rate of the pipe drilling tool 100, and extend the service life of the pipe drilling tool 100. Of course, it is not limited to this. In addition to the welding method, the first rotating shaft 131 and the first rotating cutting plate 130 and the second rotating shaft 141 and the second rotating cutting plate 140 can also be connected by interference fit, snap connection, threaded connection, riveting or key connection, etc., which are not specifically limited here.

[0037] In this embodiment, the first rotating shaft 131 and the second rotating shaft 141 are centrally symmetrical about the main shaft 120. The symmetrical structure can achieve more balanced force during operation, offset part of the working stress, and improve the structural strength and reliability.

[0038] Further, the drill tool body 110 is provided with a first stopper 151 and a second stopper 152, the first stopper 151 is connected to the first rotary cutting plate 130, and is used to limit the rotation range of the first rotary cutting plate 130; the second stopper 152 is connected to the second rotary cutting plate 140, and is used to limit the rotation range of the second rotary cutting plate 140. It is easy to understand that the rotation range of the first rotary cutting plate 130 and the second rotary cutting plate 140 will affect the size of the first rotary cutting plate 130 and the second rotary cutting plate 140 that is rotated and exposed to the outside of the casing 200, that is, the size of the aperture of the rotary drilled hole.

[0039] Figure 2 This is a schematic diagram of the application structure of the pipe drilling tool 100 provided in a specific embodiment of the present invention from a first perspective. Figure 3 The schematic diagram of the application structure of the second perspective of the pipe drilling tool 100 provided in the specific embodiment of the present invention is shown in FIG. Figure 2 and Figure 3 .

[0040] Optionally, a fixed bottom plate 150 is further provided on the drill tool body 110, and a first stopper 151 and a second stopper 152 are provided on the fixed bottom plate 150. The spindle 120 passes through the fixed bottom plate 150, and a drill bit 121 is installed on the spindle 120. The drill bit 121 is located at the front end of the pipe drill tool 100 and serves as a main drilling component when drilling holes in rock and soil. The fixed bottom plate 150 is located on the side of the first rotating cutting plate 130 and the second rotating cutting plate 140 away from the drill bit 121. The first stopper 151 and the second stopper 152 are provided on the fixed bottom plate 150. Specifically, the first rotating cutting plate 130 is provided with a first limiting groove 132, the position of the first limiting groove 132 corresponds to the position of the first limiting member 151, so that the first limiting member 151 can be movably clamped in the first limiting groove 132, when the first rotating cutting plate 130 rotates, the first limiting groove 132 and the first limiting member 151 rotate relative to each other, and the first limiting member 151 is used to limit the rotation range of the first rotating cutting plate 130. Similarly, the second rotating cutting plate 140 is provided with a second limiting groove 142, the position of the second limiting groove 142 corresponds to the position of the second limiting member 152, so that the second limiting member 152 can be movably clamped in the second limiting groove 142. When the second rotating cutting plate 140 rotates, the second limiting groove 142 and the second limiting member 152 rotate relative to each other, and the second limiting member 152 is used to limit the rotation range of the first rotating cutting plate 130.

[0041] In this embodiment, the first limiting groove 132 and the second limiting groove 142 are arc grooves, respectively, and the arc of the arc groove is consistent with the rotation arc of the first rotating cutting plate 130 and the second rotating cutting plate 140. The arc length of the arc groove is set according to the diameter of the rotary drilling hole of the rotary drilling rig. It should be noted that in other optional embodiments, the limiting groove can also be opened on the fixed bottom plate 150, and the limiting member can be set on the first rotating cutting plate 130 and the second rotating cutting plate 140, which can also achieve the limitation of the rotation angle of the first rotating cutting plate 130 and the second rotating cutting plate 140. Alternatively, a stopper is set on the drill tool body 110 to limit the rotation range of the first rotating cutting plate 130 and the second rotating cutting plate 140, which is not specifically limited here.

[0042] Optionally, the first rotating cutting plate 130 includes a first end 133 and a second end 135 connected to each other, and the first end 133 is closer to the inner wall of the casing 200 than the second end 135, and the second rotating cutting plate 140 includes a third end 143 and a fourth end 145 connected to each other, and the third end 143 is closer to the inner wall of the casing 200 than the fourth end 145. A cutting guide plate 161 is provided on the first end 133 and the third end 143, respectively, and each cutting guide plate 161 is provided with a plurality of rotary digging teeth 163 arranged at intervals. During the drilling process of the follow-up drill bit 100, the rotary digging teeth 163 and the drill bit 121 jointly cut the rock and soil to achieve rotary drilling. In this embodiment, when the follow-up drill bit 100 is drilling in the forward direction, that is, the main shaft 120 drives the drill bit 121 to rotate in the forward direction, such as Figure 2 As shown, the first rotating shaft 131 drives the first rotating cutting plate 130 to rotate forward (clockwise), and the second rotating shaft 141 drives the second rotating cutting plate 140 to rotate forward (clockwise), that is, the first rotating cutting plate 130 and the second cutting plate rotate relative to the fixed bottom plate 150 along the first direction, and under the push of the cutting resistance, the first end 133 and the third end 143 extend to the outside of the casing 200 and are exposed to the outside of the casing 200. At this time, the diameter of the hole drilled by the pipe drilling tool 100 is slightly larger than the outer diameter of the casing 200, which has a hole expansion effect, thereby realizing pipe drilling, which is beneficial to reducing the friction resistance during the lowering process of the casing 200, while ensuring the consistency of the diameter of the cast-in-place pile from top to bottom, and reducing the over-square phenomenon of the project. When the pipe drilling tool 100 rotates in the reverse direction, that is, the main shaft 120 drives the drill bit 121 to rotate in the reverse direction, the first rotating cutting plate 130 and the second cutting plate rotate relative to the fixed bottom plate 150 in the second direction (i.e., counterclockwise direction), and the first end 133 and the third end 143 are retracted toward the inside of the casing 200 under the driving effect of the cutting resistance, and retracted to the inside of the casing 200. At this time, the overall size of the pipe drilling tool 100 becomes smaller, and is consistent with the drilling tool body 110, and is smaller than the inner diameter of the casing 200, so that it can easily move up and down inside the casing 200, realizing the stepwise soil extraction and cyclic operation.

[0043] The following pipe drill 100 provided in this embodiment can realize the shrinkage of the outer diameter of the drill body 110 during the lowering process of the drill body 110 in the casing 200; during the cutting and drilling process, the first rotating cutting plate 130 and the second rotating cutting plate 140 that are movable and arranged at the bottom of the drill body 110 can be cut forward with the drill bit 121, and the outer diameter of the drill body 110 becomes larger and extends to the outside of the casing 200 to realize the expansion drilling, thereby reducing the friction resistance during the lowering process of the casing 200. At the same time, the outer diameter of the drill body 110 is slightly larger than the outer diameter of the casing 200, which can ensure the consistency of the diameter of the cast-in-place pile from top to bottom and reduce the over-square phenomenon of the project. In addition, when the drill bit 121 cuts in the reverse direction, the first rotating cutting plate 130 and the second rotating cutting plate 140 shrink toward the inside of the casing 200 and retract to the inside of the casing 200, so that it can be easily moved up and down inside the casing 200 to realize the step-by-step soil extraction and cyclic operation.

[0044] The embodiment of the present invention further provides a rotary drilling rig, comprising a power mechanism and a pipe drilling tool 100 as in any one of the above-mentioned embodiments, wherein the power mechanism is connected to a drilling tool body 110 to provide cutting power for the drilling tool body 110. The pipe drilling tool 100 comprises a drilling tool body 110, a spindle 120, a first rotating cutting plate 130 and a second rotating cutting plate 140, wherein the spindle 120 is disposed on the drilling tool body 110 and is used to mount a drill bit 121; the first rotating cutting plate 130 and the second rotating cutting plate 140 are centrally symmetrical about the spindle 120. The first rotating cutting plate 130 and the second rotating cutting plate 140 rotate in a first direction so that the first rotating cutting plate 130 and the second rotating cutting plate 140 are exposed to the outside of the casing 200; the first rotating cutting plate 130 and the second rotating cutting plate 140 rotate in a second direction so that the first rotating cutting plate 130 and the second rotating cutting plate 140 retract to the inside of the casing 200. The drill tool body 110 of the rotary drilling rig can achieve variable diameter adjustment. When the drill bit 121 is drilling forward, the first rotary cutting plate 130 and the second rotary cutting plate 140 arranged at the center of the bottom of the drill tool body 110 can extend to the outside of the casing 200, and the overall size of the drill tool body 110 becomes larger, so as to achieve hole expansion drilling. Under this working condition, the friction resistance during the lowering process of the casing 200 can be reduced, and the consistency of the diameter of the cast-in-place pile can be ensured, and the over-square phenomenon of the project can be reduced. When the drill bit 121 is cutting in the reverse direction, the first rotary cutting plate 130 and the second rotary cutting plate 140 can be retracted to the inside of the casing 200, and the overall size of the drill tool body 110 becomes smaller, so that the drill tool body 110 can move up and down more easily inside the casing 200, so as to achieve batch soil extraction and cyclic operation.

[0045] In summary, the embodiment of the present invention provides a pipe drilling tool 100 and a rotary drilling rig, which have the following beneficial effects:

[0046] The pipe drill 100 provided by the embodiment of the present invention has a first rotating cutting plate 130 and a second rotating cutting plate 140 arranged in the center at the bottom of the drill body 110. When the drill bit 121 is drilling forward, the first rotating cutting plate 130 and the second rotating cutting plate 140 extend to the outside of the casing 200, and the overall size of the drill body 110 becomes larger, so that the hole expansion drilling is realized, which is beneficial to reduce the friction resistance during the lowering process of the casing 200, and at the same time ensures the consistency of the diameter of the cast-in-place pile from top to bottom, and reduces the over-square phenomenon of the project. When the drill bit 121 rotates in the opposite direction, the first rotating cutting plate 130 and the second rotating cutting plate 140 retract toward the inside of the casing 200, and the overall size of the drill body 110 becomes smaller, so that it can easily move up and down inside the casing 200, so as to realize the soil extraction and cyclic operation in batches.

[0047] The rotary drilling rig provided by the embodiment of the present invention includes the above-mentioned follow-tube drill bit 100, which can be used in the casing 200 and is suitable for working conditions where the casing 200 is needed in silty clay that is easy to shrink, loose miscellaneous fill layers and sand layers that are easy to collapse, and severely permeable layers. It can not only reduce the frictional resistance during the lowering process of the casing 200, but also ensure the consistency of the diameter of the cast-in-place piles up and down, and reduce the phenomenon of engineering over-squareness; it can also easily move up and down inside the casing 200 to achieve phased soil extraction and cyclic operations.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pipe drilling tool, characterized in that: Applicable to a casing (200); the following pipe drilling tool comprises a drilling tool body (110), a main shaft (120), a first rotating cutting plate (130) and a second rotating cutting plate (140); the main shaft (120) is arranged on the drilling tool body (110) and is used to install a drill bit (121); the first rotating cutting plate (130) and the second rotating cutting plate (140) are centrally symmetrical about the main shaft (120); The first rotating cutting plate (130) and the second rotating cutting plate (140) rotate in a first direction so that the first rotating cutting plate (130) and the second rotating cutting plate (140) are exposed to the outside of the protective tube (200); the first rotating cutting plate (130) and the second rotating cutting plate (140) rotate in a second direction so that the first rotating cutting plate (130) and the second rotating cutting plate (140) are retracted to the inside of the protective tube (200); The drilling tool body (110) is provided with a first rotating shaft (131) and a second rotating shaft (141), wherein the first rotating shaft (131) is connected to the first rotating cutting plate (130) and is used to drive the first rotating cutting plate (130) to rotate; the second rotating shaft (141) is connected to the second rotating cutting plate (140) and is used to drive the second rotating cutting plate (140) to rotate; The drilling tool body (110) is provided with a first limiting member (151) and a second limiting member (152). The first limiting member (151) is connected to the first rotating cutting plate (130) and is used to limit the rotation range of the first rotating cutting plate (130); the second limiting member (152) is connected to the second rotating cutting plate (140) and is used to limit the rotation range of the second rotating cutting plate (140).

2. The pipe drilling tool according to claim 1, characterized in that: The first rotating shaft (131) and the second rotating shaft (141) are centrally symmetrical about the main axis (120).

3. The pipe drilling tool according to claim 1, characterized in that: The first rotating shaft (131) is welded to the first rotating cutting plate (130), and the second rotating shaft (141) is welded to the second rotating cutting plate (140).

4. The pipe drilling tool according to claim 1, characterized in that: The drilling tool body (110) is provided with a fixed base plate (150), and the fixed base plate (150) is provided with the first limiting member (151) and the second limiting member (152); the first rotating cutting plate (130) is provided with a first limiting groove (132), and the second rotating cutting plate (140) is provided with a second limiting groove (142), the first limiting member (151) is movably clamped in the first limiting groove (132), and the second limiting member (152) is movably clamped in the second limiting groove (142).

5. The pipe drilling tool according to claim 4, characterized in that: The first limiting groove (132) and the second limiting groove (142) are arc grooves respectively.

6. The pipe drilling tool according to claim 1, characterized in that: The first rotating cutting plate (130) comprises a first end portion (133) and a second end portion (135) connected to each other, the first rotating cutting plate (130) rotates along the first direction so that the first end portion (133) is exposed outside the casing (200); the first rotating cutting plate (130) rotates along the second direction so that the first end portion (133) is retracted to the inside of the casing (200); The second rotating cutting plate (140) includes a third end (143) and a fourth end (145) connected to each other. The second rotating cutting plate (140) rotates along the first direction so that the third end (143) is exposed outside the protective tube (200); the second rotating cutting plate (140) rotates along the second direction so that the fourth end (145) is retracted to the inside of the protective tube (200).

7. The pipe drilling tool according to claim 6, characterized in that: The first end portion (133) and the third end portion (143) are respectively provided with a cutting guide plate (161).

8. A rotary drilling rig, characterized in that: It comprises a power mechanism and a pipe-following drill tool as claimed in any one of claims 1 to 7, wherein the power mechanism is connected to the drill tool body (110).

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