Hole expander for trenchless directional crossing of thermal pipelines

Abstract

The present invention discloses a reamer for trenchless directional crossing construction of a thermal pipeline, comprising a reaming head with a conical structure, a plurality of hollow holes are provided on the conical surface of the reaming head, a rock and soil feeding cavity matching the number of the hollow holes is formed inside the reaming head, all the rock and soil feeding cavities are distributed along the axial direction parallel to the reaming head, one end of each rock and soil feeding cavity is connected with the corresponding hollow hole, and the other end is connected with the chip removal hole provided on the end face of the reaming head; a transmission column is fixedly connected to the center of one side of the chip removal hole provided in the reaming head, a spiral blade is fixed on the circumferential surface of the transmission column along its axial direction, an outer shell is concentrically arranged on the outer side of the transmission column, the outer shell is connected to the reaming head for relative rotation, and the end of the transmission column is extended to the outside of the outer shell and then connected with a connector. The disturbance plate in the present invention periodically swings in the rock and soil feeding cavity, so that the drill cuttings on the conical surface of the reaming head can be quickly discharged, thereby ensuring the smooth progress of reaming.

Description

Technical Field

[0001] The invention relates to the field of drilling equipment, in particular to a hole expander for trenchless directional crossing construction of thermal pipelines. Background Art

[0002] Directional drilling is usually used in the construction of thermal pipelines, that is, a pilot hole is first opened, and then a reamer is used to expand the pilot hole to the required size. The reaming process mainly uses a conical reaming drill bit to contact the rock and soil for drilling. The drill cuttings generated by the reamer accumulate on the conical surface of the reaming drill bit, which easily affects the smooth reaming of the reamer. Therefore, whether the drill cuttings accumulated in this area can be quickly discharged directly determines the efficiency of reaming.

[0003] A Chinese patent discloses a horizontal directional drilling reamer with patent number CN221346802U. In order to discharge the drill cuttings accumulated at the front end of the drill bit, the reamer has a hollow hole on the conical surface of the drill bit. After the drill cuttings enter the drill bit, they contact the spiral conveying rod inside the drill rod, so that the drill cuttings are discharged through the drill rod. Due to the conical structure of the drill bit itself, the drill cuttings will quickly flow into the drill bit when they contact the drill bit. However, due to the limited diameter of the drill rod, if the chip discharge speed inside the drill rod cannot discharge the drill cuttings in time, the drill cuttings outside the drill bit will continue to pressurize the drill cuttings inside the drill bit, and eventually the drill bit will be filled with drill cuttings. In severe cases, the drill cuttings may even agglomerate, and eventually the drill bit will be blocked, thereby affecting the drilling efficiency of the drill bit. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a hole expander for trenchless directional crossing construction of thermal pipelines.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a reamer for trenchless directional crossing construction of a thermal pipeline, comprising a reaming head with a conical structure, a plurality of hollow holes are formed on the conical surface of the reaming head, a rock and soil feeding cavity matching the number of the hollow holes is formed inside the reaming head, all the rock and soil feeding cavities are distributed along the axial direction parallel to the reaming head, one end of each rock and soil feeding cavity is connected to the corresponding hollow hole, and the other end is connected to the chip removal hole opened on the end surface of the reaming head;

[0006] A transmission column is fixedly connected to the center of one side of the reaming head where the chip removal hole is opened, a spiral blade is fixed on the circumferential surface of the transmission column along its axial direction, an outer shell is concentrically arranged on the outer side of the transmission column, the outer shell is connected to the reaming head for relative rotation, and the end of the transmission column is extended to the outside of the outer shell and connected to a connector;

[0007] The rock and soil feeding cavity is inclined on one side toward the center of the reaming head, and a disturbance plate is hinged inside each rock and soil feeding cavity. During the rotating reaming process of the reaming head, the disturbance plate periodically swings inside the rock and soil feeding cavity to disturb the rock and soil, so that the rock and soil in the rock and soil feeding cavity are transported to the inside of the outer shell through the chip removal hole.

[0008] Preferably, the rock and soil feeding chamber includes an isolation frame, and sealing side plates are fixedly connected to both sides of the isolation frame, and the sealing side plates are respectively arranged to fit the conical surface and the end surface inside the reaming head. A slope structure is formed on the side of the isolation frame close to the center of the reaming head, and the slope structure gradually extends toward the center of the reaming head from the hollow hole to the chip removal hole. The disturbance plate is hingedly connected to one end of the slope structure close to the hollow hole, and the disturbance of the rock and soil inside the reaming head is caused by the periodic swing of the disturbance plate in the slope structure.

[0009] Preferably, a turntable is rotatably installed at the center of one side of the reaming head near the transmission column, and the turntable is annularly distributed with first limit chutes that are adapted to the number of rock and soil feeding cavities, and all the first limit chutes have the same specifications, and two adjacent first limit chutes are connected through a second limit chute that is recessed inwardly, and all the second limit chutes have the same specifications;

[0010] On the inner wall of the reaming head, there are slide seats matching the number of rock and soil feeding cavities on the periphery of the turntable. A transmission rod is installed on the inner sliding guide of each slide seat. All the transmission rods are distributed along the radial direction of the reaming head. One end of the transmission rod extends toward the turntable and is fixed with a plug rod. The plug rod is inserted into the corresponding first limiting slide groove and slidably connected thereto. The other end of the transmission rod passes through the isolation frame and is connected to the disturbance plate.

[0011] A guide slide bar is fixed on the side of the disturbance plate facing the inclined structure of the isolation frame, a slider is slidably sleeved on the guide slide bar, and the transmission rod is extended into the isolation frame and hingedly connected to the corresponding slider;

[0012] The turntable and the reaming head rotate at a differential speed.

[0013] Preferably, the interior of the reaming head is a hollow structure, wherein a first cavity and a second cavity are formed by a partition, and the rotating disk is located in the second cavity;

[0014] A water supply pipe is coaxially installed inside the transmission column. One end of the water supply pipe passes through the connector and is connected to the outside. The other end passes through the reaming head and the turntable in sequence and is connected to a water guide pipe. The turntable is fixedly sleeved on the outside of the water guide pipe. The water guide pipe passes through the partition and extends into the first cavity. A spiral guide vane is installed on the inner wall of the water supply pipe. Water with a certain pressure is injected into the water supply pipe to act on the spiral guide vane, so that the water supply pipe and the transmission column form differential rotation.

[0015] A water guide groove is provided through the inclined structure of each isolation frame.

[0016] Preferably, one end of the outer shell is rotatably connected to the end face of the reaming head, and the other end is mounted on the outer circumferential surface of the transmission column through a rotating ring, so that the outer shell and the transmission column form differential rotation.

[0017] Preferably, the connecting head is in a hexagonal prism structure, and a space is reserved between the connecting head and the outer shell for the rock and soil to be discharged from the outer shell.

[0018] Preferably, one end of the reaming head facing away from the outer shell is coaxially fixedly connected with a traction guide column, and the traction guide column has the same inner diameter as the drilled hole.

[0019] Compared with the prior art, the present invention provides a hole expander for trenchless directional crossing construction of thermal pipelines, which has the following beneficial effects:

[0020] (1) The present invention sets a plurality of rock and soil feeding cavities inside the reaming head along a direction parallel to the axial direction thereof. The rock and soil entering the rock and soil feeding cavities from the hollow holes are discharged into a feeding channel composed of an outer shell and a transmission column. This relatively wide feeding channel can meet the needs of rapid discharge of drill cuttings. The high-frequency swing of the disturbance plate inside the rock and soil feeding cavity causes the rock and soil to vibrate, thereby accelerating its discharge from the rock and soil feeding cavity. In addition, since the disturbance plate in the rock and soil feeding cavity is always in a swinging state, the rock and soil in the rock and soil feeding cavity will not be blocked due to agglomeration.

[0021] (2) The outer shell in the present invention is directly connected to the reaming head, and the drill cuttings are directly discharged from the reaming head into the inner side of the outer shell, thereby preventing the drill cuttings from being distributed between the outer shell and the reaming hole, thereby avoiding large friction between the outer shell and the reaming hole, and facilitating the withdrawal of the reamer at a later stage.

[0022] (3) The arrangement of the water supply pipe in the present invention can not only cool down the inside of the hollow structure of the reaming head, but also drive itself to rotate by means of water, so that the turntable and the reaming head form a differential rotation, thereby driving all the disturbance plates to swing periodically in the isolation frame. The high-frequency swing of the disturbance plates can accelerate the flow of rock and soil in the rock and soil feeding cavity, thereby ensuring the rapid discharge of drill cuttings.

[0023] (4) The disturbance plate swings periodically inside the isolation frame. When the disturbance plate swings to fit the inclined structure of the isolation frame, the pressure in the first cavity increases. When the disturbance plate loses contact with the inclined structure, pressurized water is ejected from the bottom of the end of the disturbance plate, just flushing the rock and soil above the end of the disturbance plate onto the spiral blades of the feed channel. The spiral blades are used to quickly transport the rock and soil and water to the outside, avoiding the accumulation of rock and soil at the outlet of the chip removal hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 A schematic diagram of the three-dimensional structure of the entire reamer along the axonometric direction in the embodiment;

[0026] Figure 2 It is a schematic structural diagram of the entire outer shell of the reamer after being cut away in the embodiment;

[0027] Figure 3 Schematic diagram of the distribution of spiral guide vanes inside the water supply pipe in the embodiment;

[0028] Figure 4 is a schematic diagram of a first angle inside the reaming head in the embodiment;

[0029] Figure 5 A schematic diagram of another angle of the inside of the reaming head in the embodiment;

[0030] Figure 6 Schematic diagram of the connection between the transmission rods and the rotating disk in the four rock and soil feeding chambers in the embodiment;

[0031] Figure 7 A schematic diagram of the connection between the isolation frame and the rotating disk in the embodiment;

[0032] Figure 8 It is a schematic diagram of the overall structure of a single isolation frame in the embodiment.

[0033] In the figure: 1. outer shell; 2. expansion head; 3. traction guide column; 4. connector; 5. transmission column; 6. water supply pipe; 7. spiral blade; 8. hollow hole; 9. chip removal hole; 10. partition; 11. rock and soil feeding cavity; 12. water guide pipe; 13. turntable; 14. first limit slide; 15. second limit slide; 16. isolation frame; 17. rotating plate; 18. sealing side plate; 19. slide seat; 20. transmission rod; 21. disturbance plate; 22. water guide groove; 23. plug rod; 24. guide slide rod; 25. slider; 26. spiral guide plate. DETAILED DESCRIPTION

[0034] 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 only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0035] This embodiment provides a hole expander for trenchless directional crossing construction of thermal pipelines, such as Figures 1 to 8 As shown, it includes a reaming head 2 with a conical structure, four hollow holes 8 are provided on its conical surface, and crushing teeth for reaming are distributed in the area where the hollow holes 8 are not provided on the conical surface, and four rock and soil feeding cavities 11 are formed inside the reaming head 2, and the four rock and soil feeding cavities 11 are distributed along the axial direction parallel to the reaming head 2, one end of each rock and soil feeding cavity 11 is connected with the corresponding hollow hole 8, and the other end is connected with the chip removal hole 9 provided on the end surface of the reaming head 2, the front end of the reaming head 2 is inserted into the hole to be reamed in advance, and then the reaming head 2 is rotated to expand the hole by using its conical surface structure, the crushing teeth crush the rock and soil and then slide along the hollow hole 8 into the rock and soil feeding cavity 11, and the rock and soil are finally discharged from the chip removal hole 9, and the crushed rock and soil are quickly discharged to avoid accumulation on the conical surface of the reaming head 2 and affecting the forward movement of the reamer in the hole.

[0036] A transmission column 5 is fixedly connected to the center of one side of the reaming head 2 with a chip removal hole 9, and a spiral blade 7 is fixed on the circumferential surface of the transmission column 5 along its axial direction. An outer shell 1 is concentrically arranged on the outer side of the transmission column 5, and a rock and soil conveying channel is formed between the outer shell 1 and the transmission column 5. The outer shell 1 is relatively rotatably connected to the reaming head 2. The end of the transmission column 5 extends to the outside of the outer shell 1 and is connected to a connector 4. Considering that the connector 4 is to be connected to an external drilling rig, it is set to be a hexagonal prism structure. When the reamer is working, the connector 4 is installed on the drilling rig, and the drilling rig drives the transmission column 5 and the reaming head. The head 2 rotates at high speed, and the crushed rock and soil enters the conveying channel through the hollow hole 8, the rock and soil feeding cavity 11 and the chip removal hole 9. When the transmission column 5 rotates, the spiral blade 7 rotates synchronously therewith. However, since one end of the outer shell 1 is rotationally connected to the end face of the reaming head 2, and the other end is mounted on the outer circumferential surface of the transmission column 5 through a rotating ring, the outer shell 1 cannot rotate synchronously with it. This will cause the outer shell 1 and the transmission column 5 to form a differential rotation. When the spiral blade 7 rotates, it will drive the rock and soil to move in the conveying channel, and finally be discharged from the end of the outer shell 1.

[0037] It should be noted that, in the present embodiment, the outer diameter of the outer shell 1 can be consistent with the maximum diameter of the reaming head 2, so that the outer shell 1 and the transmission column 5 can form differential rotation with the help of the friction between the outer shell 1 and the inner wall of the hole. However, in actual work, since collapse or scattering of rock and soil is inevitable after reaming, the diameter of the outer shell 1 can be slightly smaller than the inner diameter of the reaming hole. This can avoid that the friction between the outer shell 1 and the hole is too large, and the reamer is difficult to withdraw. When the diameter of the outer shell 1 is set to be slightly smaller than the inner diameter of the reaming hole, when the reamer is working, the personnel can use external force to apply a force to the outer shell 1 to keep it stationary. As for what kind of external force is used to keep the outer shell 1 stationary, there is no restriction here.

[0038] In addition, since the reamer in this embodiment is used to enlarge the already drilled hole, the moving path of the reamer is required to always be consistent with the path of the drilled hole, so that the enlarged hole can be coaxial with the original drilled hole, which is convenient for the subsequent installation of the pipeline. In view of this, in this embodiment, a traction guide column 3 is coaxially fixedly connected to the end of the reaming head 2 away from the outer shell 1. The traction guide column 3 is the same as the inner diameter of the drilled hole. When the reamer is reaming the hole, the traction guide column 3 moves forward in the original drilled hole. This can ensure that the reamed hole is always coaxial with the original drilled hole, thereby ensuring the quality of the reaming.

[0039] In the above scheme, the flow of rock and soil in the rock and soil feeding cavity 11 mainly relies on the inertia of the rock and soil itself during the forward movement of the reaming head 2. The flow area of ​​the entire rock and soil feeding cavity 11 is limited. The rock and soil are easy to clump in a small space and cause blockage. Once the inside of the rock and soil feeding cavity 11 is blocked, the resistance to the forward movement of the reaming head 2 will also increase. Therefore, the rock and soil feeding cavity 11 is inclined toward the side of the center of the reaming head 2, and each rock and soil feeding cavity 11 is hinged with a disturbance plate 21. During the rotation and reaming process of the reaming head 2, the disturbance plate 21 swings periodically inside the rock and soil feeding cavity 11 to disturb the rock and soil, so that the rock and soil in the rock and soil feeding cavity 11 move relative to each other, thereby avoiding agglomeration. The granular rock and soil is smoothly transported to the inner side of the outer shell 1 through the chip removal hole 9 with the help of the inclined structure inside the rock and soil feeding cavity 11.

[0040] Specifically, the rock and soil feeding chamber 11 in the present embodiment includes an isolation frame 16, and sealing side plates 18 are fixedly connected on both sides of the isolation frame 16. The sealing side plates 18 are respectively arranged to fit the conical surface and the end surface on the inner side of the reaming head 2, so that each rock and soil feeding chamber 11 can form a sealed and independent chamber structure. A slope structure is formed on the side of the isolation frame 16 close to the center of the reaming head 2, and the slope structure gradually extends toward the center of the reaming head 2 from the hollow hole 8 to the chip removal hole 9. The rock and soil on the slope structure slides toward the chip removal hole 9 under the action of gravity, and the disturbance plate 21 is hingedly connected to one end of the slope structure close to the hollow hole 8. The disturbance plate 21 swings periodically in the slope structure, and the swinging disturbance plate 21 disturbs the rock and soil, causing it to slide smoothly to the chip removal hole 9.

[0041] Furthermore, in order to make all the disturbance plates 21 swing synchronously, in this embodiment, a turntable 13 is rotatably installed at the center of the inner part of the reaming head 2 near the transmission column 5. Four first limit slides 14 are annularly distributed on the turntable 13, and the specifications of all the first limit slides 14 are consistent. Two adjacent first limit slides 14 are connected by a second limit slide 15 that is recessed inward, and the specifications of all the second limit slides 15 are also the same. Four slides 19 are distributed on the inner wall of the reaming head 2 and are located on the periphery of the turntable 13. A transmission rod 20 is installed on the inner sliding guide of each slide 19. All the transmission rods 20 are distributed along the radial direction of the reaming head 2, one end of which extends toward the turntable 13 and is fixed with an insertion rod 23. The insertion rod 23 is inserted into the corresponding first limit slide 14 and slidably connected thereto. The other end of the transmission rod 20 passes through the isolation frame 16 and is connected to the disturbance plate 21. A guide slide bar 24 is fixed on one side of the disturbance plate 21 facing the inclined structure of the isolation frame 16 , and a slider 25 is slidably sleeved on the guide slide bar 24 . The transmission rod 20 extends into the isolation frame 16 and is hingedly connected to the corresponding slider 25 . When the turntable 13 rotates relative to the reaming head 2, all the insertion rods 23 first slide inside the first limiting slot 14. When the insertion rod 23 slides into the second limiting slot 15, it will drive the transmission rod 20 to move toward the center of the reaming head 2. At this time, the disturbance plate 21 swings in the direction of the inclined structure inside the isolation frame 16, thereby increasing the effective space inside the rock and soil feeding cavity 11. When the insertion rod 23 slides from the second limiting slot 15 to the first limiting slot 14, all the transmission rods 20 move in the direction away from the center of the reaming head 2, causing the disturbance plate 21 to move in the direction away from the inclined structure inside the isolation frame 16, thereby reducing the effective space inside the rock and soil feeding cavity 11. The reciprocating motion of the disturbance plate 21 can disturb the rock and soil inside the rock and soil feeding cavity 11 to prevent the rock and soil from accumulating in the rock and soil feeding cavity 11.

[0042] The premise of the above scheme is that the turntable 13 and the reaming head 2 can form differential rotation. In order to achieve the above purpose, the present invention first sets the interior of the reaming head 2 into a hollow structure, and the interior thereof forms a first cavity and a second cavity through a partition 10, and the turntable 13 is located in the second cavity. A water supply pipe 6 is coaxially installed inside the transmission column 5, one end of which passes through the connector 4 and is connected to the outside, and the other end passes through the reaming head 2 and the turntable 13 in turn and is connected to a water guide pipe 12, and the turntable 13 is fixedly sleeved on the outside of the water guide pipe 12. The interior of the reaming head 2 forms a first cavity and a second cavity through a partition 10, wherein the first cavity is used to store water, and the turntable 13 is placed in the second cavity to avoid contact with water, and the water guide pipe 12 passes through the partition 10 and extends into the first cavity. In the existing drilling equipment, in order to drill smoothly, a water drill is usually used, that is, a hollow drill rod is installed on the drilling rig, and the drilling rig is also equipped with a water supply system. Water with a certain pressure in the system flows from the center of the drill rod to the front end of the drill rod, which not only cools the drill bit, but also washes away the broken rock and soil. The present invention also adopts this technology. A water supply pipe 6 is rotatably installed inside the transmission column 5, and a spiral guide plate 26 is installed on the inner wall of the water supply pipe 6. The pressurized water in the system is injected into the water supply pipe 6 to act on the spiral guide plate 26, so that the water supply pipe 6 rotates in the opposite direction to the transmission column 5, so that the turntable 13 and the reaming head 2 can produce relative rotation, and all the disturbance plates 21 swing synchronously inside the isolation frame 16. Even if the water pressure is not enough to drive the water supply pipe 6 to rotate in the opposite direction relative to the transmission column 5, the transmission column 5 and the water supply pipe 6 can still form a differential rotation.

[0043] When the reamer is installed on the drilling rig, the water of the system enters the second cavity through the water supply pipe 6 to cool the reaming head 2. A water guide groove 22 is opened on the inclined structure of each isolation frame 16. The water that completes the heat exchange enters the isolation frame 16 through the water guide groove 22 and is finally discharged into the conveying channel from the chip removal hole 9. The water flushes out the rock and soil in the conveying channel, thereby accelerating the discharge of the rock and soil. In addition, since the disturbance plate 21 swings periodically inside the isolation frame 16, when the disturbance plate 21 swings to fit the inclined structure of the isolation frame 16, the water guide groove 22 is in a blocked state, and the pressure in the first cavity increases. When the disturbance plate 21 is out of contact with the inclined structure, the pressurized water is sprayed from the bottom of the end of the disturbance plate 21, which just flushes the rock and soil above the end of the disturbance plate 21 to the spiral blade 7 of the feed channel, and the spiral blade 7 is used to quickly transport the rock and soil and water to the outside to avoid the rock and soil from being concentrated at the outlet of the chip removal hole 9. Since the rock, soil and water are mixed and discharged to the outside of the outer shell 1 through the feed channel, it can be imagined that a suitable space must be reserved between the connector 4 and the outer shell 1 for the rock and soil to be discharged from the outer shell 1. It should also be noted that when the disturbance plate 21 is out of contact with the inclined structure, the rock and soil feed cavity 11 is filled with rock and soil, and its effective space is further reduced. Therefore, the pressure inside the rock and soil feed cavity 11 is gradually increasing at this time. After water enters the feed channel from the chip removal hole 9, the pressure in the feed channel is very small compared to the rock and soil feed cavity 11, so water does not enter the rock and soil feed cavity 11 from the chip removal hole 9.

[0044] In the description of the present invention, the terms "first", "second", "another", and "yet another" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0046] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A reamer for trenchless directional crossing of a thermal pipeline, comprising a reamer head (2) having a conical structure, a plurality of hollow holes (8) being formed on the conical surface thereof, characterized in that: The reaming head (2) is internally formed with rock and soil material delivery cavities (11) whose number matches the number of the hollow holes (8), and all the rock and soil material delivery cavities (11) are distributed along an axial direction parallel to the reaming head (2), and one end of each rock and soil material delivery cavity (11) is connected to the corresponding hollow hole (8), and the other end is connected to a chip removal hole (9) provided on the end surface of the reaming head (2); A transmission column (5) is fixedly connected to the center of one side of the reaming head (2) on which the chip removal hole (9) is opened, a spiral blade (7) is fixed on the circumferential surface of the transmission column (5) along its axial direction, an outer shell (1) is concentrically arranged outside the transmission column (5), the outer shell (1) is connected to the reaming head (2) for relative rotation, and a distal end of the transmission column (5) is extended to the outside of the outer shell (1) and connected to a connecting head (4); The rock and soil feeding cavity (11) is inclined toward the center of the reaming head (2), and a disturbance plate (21) is hingedly connected inside each rock and soil feeding cavity (11). During the process of rotating the reaming head (2) to reaming, the disturbance plate (21) periodically swings inside the rock and soil feeding cavity (11) to disturb the rock and soil, so that the rock and soil in the rock and soil feeding cavity (11) is transported to the inside of the outer shell (1) through the chip removal hole (9); The rock and soil feeding cavity (11) comprises an isolation frame (16), and sealing side plates (18) are fixedly connected to both sides of the isolation frame (16), and the sealing side plates (18) are respectively arranged to fit the conical surface and the end surface of the inner side of the reaming head (2). A slope structure is formed on one side of the isolation frame (16) close to the center of the reaming head (2), and the slope structure gradually extends from the hollow hole (8) to the chip removal hole (9) toward the center of the reaming head (2). The disturbance plate (21) is hingedly connected to one end of the slope structure close to the hollow hole (8), and the disturbance of the rock and soil inside the rock and soil feeding cavity (11) is formed by the periodic swing of the disturbance plate (21) in the slope structure. A turntable (13) is rotatably mounted at the center of one side of the reaming head (2) near the transmission column (5), and the turntable (13) is provided with first limit chutes (14) distributed in an annular manner and matching the number of the rock and soil feeding chamber (11), and all the first limit chutes (14) have the same specifications, and two adjacent first limit chutes (14) are connected via inwardly recessed second limit chutes (15), and all the second limit chutes (15) have the same specifications; On the inner wall of the reaming head (2), there are slide seats (19) arranged at the periphery of the rotating disk (13), the number of which matches the number of the rock and soil feeding chambers (11). A transmission rod (20) is installed on the inner sliding guide of each slide seat (19). All the transmission rods (20) are distributed along the radial direction of the reaming head (2). One end of each transmission rod extends toward the rotating disk (13) and is fixed with an insertion rod (23). The insertion rod (23) is inserted into the corresponding first limiting sliding groove (14) and is slidably connected thereto. The other end of the transmission rod (20) passes through the isolation frame (16) and is connected to the disturbance plate (21). A guide slide bar (24) is fixed on one side of the disturbance plate (21) facing the inclined surface structure of the isolation frame (16), a slider (25) is slidably sleeved on the guide slide bar (24), and the transmission rod (20) is extended into the isolation frame (16) and is hingedly connected to the corresponding slider (25); The rotating disk (13) and the reaming head (2) rotate at a differential speed.

2. The hole expander for trenchless directional crossing of thermal pipelines according to claim 1 is characterized in that: The interior of the reaming head (2) is a hollow structure, wherein a first cavity and a second cavity are formed by a partition (10) inside the reaming head, and the rotating disk (13) is located in the second cavity; A water supply pipe (6) is coaxially rotatably installed inside the transmission column (5); one end of the water supply pipe (6) passes through the connector (4) to communicate with the outside, and the other end passes through the reaming head (2) and the turntable (13) in sequence to communicate with a water guide pipe (12); the turntable (13) is fixedly sleeved on the outside of the water guide pipe (12); the water guide pipe (12) passes through the partition (10) and extends into the first cavity; a spiral guide plate (26) is installed on the inner wall of the water supply pipe (6); water with a certain pressure is injected into the water supply pipe (6) to act on the spiral guide plate (26), so that the water supply pipe (6) and the transmission column (5) form differential rotation; A water guide groove (22) is provided through the inclined surface structure of each isolation frame (16).

3. The hole expander for trenchless directional crossing of thermal pipelines according to claim 2 is characterized in that: One end of the outer shell (1) is rotatably connected to the end surface of the reaming head (2), and the other end is mounted on the outer circumferential surface of the transmission column (5) via a rotating ring, so that the outer shell (1) and the transmission column (5) form differential rotation.

4. The hole expander for trenchless directional crossing of thermal pipelines according to claim 3 is characterized in that: The connecting head (4) is in the form of a hexagonal prism structure, and a space is reserved between the connecting head (4) and the outer shell (1) for the rock and soil to be discharged from the outer shell (1).

5. The reamer for trenchless directional crossing of thermal pipelines according to any one of claims 1 to 4, characterized in that: One end of the reaming head (2) facing away from the outer shell (1) is coaxially fixedly connected with a traction guide column (3), and the traction guide column (3) has the same inner diameter as the drilled hole.

Images