Trenchless pipeline crossing drilling tool with positive and negative screw rod direct drive type torque balance
Through the non-excavated pipe crossing drilling tool with direct-drive torque balance of forward and reverse screws, the torque synthesis and torque offset of multiple screws is achieved, solving the problems of well wall collapse and limited torque, and improving the reliability of pipeline crossing construction and pipe columns Shape stability.
Patent Information
- Application Number
- CN202411661880.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2024-12-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
During the construction of existing non-excavated pipelines, it is easy to cause problems of well wall collapse, drilling and pear-shaped holes, and the torque of traditional screw drills is limited, making it difficult to meet the requirements of pipeline crossing construction.
Non-excavation pipe passing through drilling tools with direct-drive torque balance of forward and reverse screws, realizes multi-screw torque synthesis and torque cancellation through the reverse rotation of the center and edge cutting parts, cancels traditional gear transmission, adopts surface contact structure, and simplifies design .
It realizes effective transmission of large torque, reduces the torque of the drill string, improves the reliability of pipe crossing construction and the stability of the pipe column shape, and avoids abnormal contact between the well wall.
Smart Images
Figure CN119195636A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of pipeline engineering, in particular to the technical field of pipeline crossing construction, and specifically to a forward and reverse screw direct-driven torque-balanced trenchless pipeline crossing drill tool. Background Art
[0002] When laying oil and gas pipelines, there are technical difficulties in crossing special areas such as buildings, roads, and rivers. The traditional trenching method cannot be used, and a trenchless pipe laying method is required. The existing trenchless pipeline crossing construction adopts the method of drilling a small pilot hole first and then expanding the hole step by step, which is easy to cause problems such as well wall collapse and drill jamming. At the same time, multiple hole expansions form pear-shaped holes, which is not conducive to the later large pipeline crossing. In addition, the existing screw drills are relatively small in size and generate limited torque. It is difficult for a single drill to meet the requirements of pipeline crossing construction.
[0003] Patent CN103643891A discloses a combined drilling tool that combines the torques of multiple screws to drive the drill bit to achieve one-time hole construction; however, the reverse torque of the drilling tool of this technology is too large, which is not conducive to pipeline crossing construction; at the same time, the scheme uses a crank to synthesize torque, which is not conducive to the combination of a larger number of screws; in addition, the scheme uses a positive and negative parallelogram mechanism, and the driving force arm is not constant, causing the output torque of the screw to change periodically, which is not conducive to the smooth operation of the screw.
[0004] Therefore, developing multi-screw combination drilling tools to solve the torque synthesis problem and the drill bit anti-torque problem has practical significance for solving the current difficulties in pipeline crossing construction. Summary of the invention
[0005] In order to solve the above problems, the present invention provides a non-excavation pipeline crossing drill with forward and reverse screw direct-drive torque balance, which can realize multi-screw torque synthesis and drive the center cutting part and the edge cutting part to rotate in opposite directions to offset the reverse torque of drilling.
[0006] In order to achieve the above object, the solution provided by the present invention is as follows: The forward and reverse screw direct-drive torque-balanced trenchless pipeline crossing drilling tool is characterized by comprising: The cylinder body is a cylindrical structure, the central drive assembly is placed in the central area of the cylinder body, and the edge drive assembly is placed in the edge area inside the cylinder body; The central drive assembly includes a central cutting part, and the central drive assembly drives the central cutting part to rotate around its center line. The central drive assembly includes: A central screw whose axis is parallel to the axis of the barrel; A central transmission shaft installed in the cylinder, with an axis parallel to the cylinder axis, at least two in number and arranged symmetrically along the cylinder axis, capable of rotating around its axis; One end is connected to the central screw output shaft, and the other end is connected to the central coupling of the central transmission shaft; The rod-shaped structure has two connecting parts with parallel axes and a spacing, one end of which is circumferentially fixedly connected to the central transmission shaft and the other end of which is rotatably connected to the central eccentric rod; The disc-shaped structure has an edge that rotates and connects to the central eccentric rod, and a resultant disc that is connected to the resultant axis at the center; A resultant shaft with one end connected to the center of the resultant disk and the other end connected to the central axis; the axis of the resultant shaft is parallel to the axis of the central axis and there is a distance between them; the distance between the axes of the connecting parts at both ends of the central eccentric rod is equal to the distance between the axis of the resultant shaft and the central axis; The cylindrical structure has a resultant axis installed at one end and a central cutting portion installed at the other end, and the central axis of the flow hole is arranged near the resultant axis; A disc-shaped structure including an axial flow hole is arranged at one end of the central axis away from the resultant force axis, and a cutting tooth or a central cutting portion of a cutting drill bit is arranged on the side away from the central axis; The edge drive assembly includes an edge cutting portion, and the edge drive assembly drives the edge cutting portion to rotate around its center line. The edge drive assembly includes: The axis is parallel to the axis of the barrel, the rotation direction is opposite to that of the central screw, and the power fluid is connected in series with the edge screw; An edge transmission shaft installed in the cylinder, with an axis parallel to the axis of the cylinder, at least two in number and symmetrically arranged along the axis of the cylinder, capable of rotating around its axis; A marginal coupling having one end connected to the marginal screw output shaft and the other end connected to the marginal transmission shaft; The rod-shaped structure has two connecting parts with parallel axes and a spacing, one end is circumferentially fixedly connected to the edge transmission shaft, and the other end is rotatably connected to the edge eccentric rod; Cylindrical structure, one end is rotatably connected to the edge transmission shaft, and the other end is matched with a cylindrical surface to rotatably connect the combined force cylinder of the turntable; the axis of the turntable is parallel to the axis of the combined force cylinder and there is a distance between them; the distance between the axis of the connecting part at both ends of the edge eccentric rod is equal to the distance between the axis of the turntable and the axis of the combined force cylinder; It is placed at the end of the cylinder, axially fixed and circumferentially rotatably connected with the cylinder, sleeved on the outside of the central axis and relatively rotatable, and a turntable of the edge cutting part is installed at the end away from the combined force cylinder; The annular structure is connected to the turntable, and the cutting teeth or the edge cutting part of the cutting drill bit are arranged on the side away from the turntable.
[0007] As a specific embodiment of the present invention, it is characterized in that the power fluid outlet of the edge screw is connected to the power fluid inlet of the center screw, or the power fluid outlet of the center screw is connected to the power fluid inlet of the edge screw.
[0008] As a specific implementation of the present invention, it is characterized in that the central coupling is a universal coupling, and the edge coupling is a universal coupling.
[0009] As a specific embodiment of the present invention, it is characterized in that it also includes a ferrule, which is a cylindrical structure. The ferrule is sleeved on the central shaft and fixed by screws. A step is set on the outer side of the other end of the central shaft and axially limited.
[0010] As a specific embodiment of the present invention, it is characterized by further comprising a rear support plate and a front support plate; The rear support plate is a disc-shaped structure, the front support plate is a disc-shaped structure, the two ends of the central screw are placed between the rear support plate and the front support plate and fixedly connected, the two ends of the edge screw are placed between the rear support plate and the front support plate and fixedly connected; the rear support plate is fixedly connected to the cylinder, and the front support plate is fixedly connected to the cylinder; The rear support plate is provided with an axial through hole to communicate with the flow channel, and the output shafts of the central screw and the edge screw pass through the front support plate and extend outward.
[0011] As a specific embodiment of the present invention, it is characterized in that the shell end of the central screw and the rear support plate are fixed in the circumferential direction by using a forming surface to cooperate, or the shell end of the central screw and the front support plate are fixed in the circumferential direction by using a forming surface to cooperate, or the two ends of the shell of the central screw and the rear support plate and the front support plate are fixed in the circumferential direction by using a forming surface to cooperate; The shell end of the edge screw is fixed circumferentially with the rear support plate by using a forming surface, or the shell end of the edge screw is fixed circumferentially with the front support plate by using a forming surface, or both ends of the shell of the edge screw are fixed circumferentially with the rear support plate and the front support plate by using forming surfaces.
[0012] As a specific embodiment of the present invention, it is characterized in that it also includes a square seat, one end of the combined force axis is inserted into the square seat, and the square seat and the central axis are connected by forming holes to transmit torque.
[0013] As a specific embodiment of the present invention, it is characterized in that it also includes a rib plate; the rib plate is a disc-shaped structure, the rib plate is placed in the cylinder and is sleeved in the middle area of the center screw and the edge screw; the rib plate plays a fixing and supporting role for the center screw and the edge screw; an axial through hole is set in the middle position of the rib plate to pass the power fluid.
[0014] As a specific embodiment of the present invention, it is characterized by further comprising a center disk; the center disk is a disk-shaped structure, the center disk is placed in the cylinder and fixedly connected to the cylinder, and the center disk and the cylinder are fixed by pins; the center disk is provided with an axial through hole for passing the power fluid. The center disk is provided with an axial through hole for installing the center transmission shaft and the edge transmission shaft.
[0015] As a specific embodiment of the present invention, it is characterized by further comprising a base; The base is a disc-shaped structure, and the base is fixedly connected to the end of the cylinder; the base is sleeved on the outside of the combined force disk, one end of the base is close to the turntable, and the other end is close to the edge cutting part.
[0016] Compared with the existing technology, it has the following advantages: (1) The present invention adopts screw direct drive, eliminating the traditional gear transmission part, and the moving parts are all in surface contact, with a simple and reliable structure; (2) Directly combine and use the existing screws to meet the needs of high-torque drilling, and the solution is highly feasible; (3) The forward and reverse screws are used in combination to achieve opposite rotation directions of the center cutting part and the edge cutting part. The reverse torques of the two cancel each other out, thereby reducing the torque of the drill string from the source, which is beneficial to pipeline crossing construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is the assembly principle diagram of Example 1; Figure 2 for Figure 1 AA cross-sectional view; Figure 3 for Figure 1 BB cross-sectional view; Figure 4 for Figure 1 The CC section view; In the figure: Central screw 11, central coupling 12, central transmission shaft 13, central eccentric rod 14, central pin 15, combined force disc 16, combined force shaft 17, central shaft 18, central cutting part 19; Edge screw 21, edge coupling 22, edge transmission shaft 23, edge eccentric rod 24, edge pin 25, combined force cylinder 26, rotating disk 27, edge cutting part 28; Rear support plate 2, cylinder 3, rib plate 4, front support plate 5, center plate 6, ferrule 7, base 8, cutting teeth 9, square seat 10. DETAILED DESCRIPTION
[0018] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto. Example
[0019] As shown in the attached drawings, the forward and reverse screw direct-driven torque-balanced trenchless pipeline crossing drilling tool comprises a central drive assembly, an edge drive assembly, and a barrel 3.
[0020] The central driving assembly includes a central screw 11 , a central coupling 12 , a central transmission shaft 13 , a central eccentric rod 14 , a central pin 15 , a combined force disc 16 , a combined force shaft 17 , a central shaft 18 , and a central cutting portion 19 .
[0021] The barrel 3 is a cylindrical structure, the central drive assembly is placed in the central area of the barrel 3, and the axis of the central screw 11 is parallel to the axis of the barrel 3.
[0022] The central transmission shaft 13 is installed in the cylinder 3, and its axis is parallel to the axis of the cylinder 3. The central transmission shaft 13 can rotate around its axis.
[0023] The output shaft of the center screw 11 is connected to the center transmission shaft 13 through a center coupling 12, and the center coupling 12 is a universal coupling; the other end of the center transmission shaft 13 is connected to the center eccentric rod 14, and a circumferential fixed connection is adopted. In this embodiment, a formed hole is used to transmit torque.
[0024] The central eccentric rod 14 is a rod-shaped structure, and the axes of the connecting parts at both ends are parallel and spaced. The central eccentric rod 14 is installed at one end away from the central transmission shaft 13, and a central pin 15 is installed, and a cylindrical surface is used to match to achieve a rotatable connection.
[0025] The center pin 15 is inserted into the hole on the edge of the combined force disk 16; the combined force disk 16 is a disc-shaped structure; the combined force shaft 17 is installed in the center of the combined force disk 16 and is matched with a cylindrical surface; the end of the combined force shaft 17 away from the combined force disk 16 is connected to the center shaft 18, and the axis of the combined force shaft 17 is parallel to the axis of the center shaft 18 and has a spacing. At least one end of the combined force shaft 17 is a rotation connection.
[0026] The distance between the axes of the connecting parts at both ends of the central eccentric rod 14 is equal to the distance between the axes of the resultant axis 17 and the central axis 18 .
[0027] The central shaft 18 is a cylindrical structure. The central cutting part 19 is installed at one end of the central shaft 18 away from the combined force axis 17. The cutting teeth 9 or cutting drill bits are arranged on the side of the central cutting part 19 away from the central shaft 18. The central cutting part 19 is a disc-shaped structure. The central shaft 18 is provided with a flow hole at a position close to the combined force axis 17. The flow hole connects the inner and outer spaces of the central shaft 18 to realize the channel connection of the power fluid. The central cutting part 19 is provided with an axial flow channel hole to transport the fluid in the central shaft 18 to the outside of the central cutting part 19.
[0028] The edge driving assembly includes: an edge screw 21 , an edge coupling 22 , an edge transmission shaft 23 , an edge eccentric rod 24 , an edge pin 25 , a force combining cylinder 26 , a rotating disk 27 , and an edge cutting portion 28 .
[0029] The edge drive assembly is placed in the inner edge area of the cylinder 3 , and the axis of the edge screw 21 is parallel to the axis of the cylinder 3 .
[0030] The edge transmission shaft 23 is installed in the cylinder 3, and its axis is parallel to the axis of the cylinder 3. The edge transmission shaft 23 can rotate around its axis.
[0031] The output shaft of the edge screw 21 is connected to the edge transmission shaft 23 through an edge coupling 22, which is a universal coupling; the other end of the edge transmission shaft 23 is connected to the edge eccentric rod 24, and a circumferential fixed connection is adopted. This embodiment adopts a formed hole to transmit torque.
[0032] The edge eccentric rod 24 is a slender rod-shaped structure, and the axes of the connecting parts at both ends are parallel and spaced. The edge eccentric rod 24 is installed at one end away from the edge transmission shaft 23, and the edge pin 25 is installed, and the cylindrical surface is matched to realize the rotatable connection.
[0033] The edge pin 25 is inserted into the hole at the end of the combined cylinder 26; the combined cylinder 26 is a cylindrical structure, and the end of the combined cylinder 26 is inserted into the turntable 27 and adopts a cylindrical surface to achieve a rotatable connection.
[0034] The axis of the rotating disk 27 is parallel to the axis of the force combining cylinder 26 and there is a gap between them.
[0035] The distance between the axes of the connecting parts at both ends of the edge eccentric rod 24 is equal to the distance between the axis of the rotating disk 27 and the axis of the combined force cylinder 26.
[0036] The turntable 27 is sleeved on the outside of the central shaft 18 and can rotate relatively. The edge cutting part 28 is installed at one end of the turntable 27 away from the combined force cylinder 26, and the cutting teeth 9 or cutting drill bits are arranged on the side of the edge cutting part 28 away from the turntable 27. The turntable 27 is placed at the end position of the cylinder 3, and the turntable 27 is axially fixed and circumferentially rotatably connected to the cylinder 3. The edge cutting part 28 is a circular ring structure.
[0037] The rotation direction of the edge screw 21 is opposite to that of the central screw 11; that is, one is a forward-rotating screw and the other is a counter-rotating screw.
[0038] The power fluid of the edge screw 21 is connected in series with the power fluid of the center screw 11 ; the power fluid outlet of the edge screw 21 is connected to the power fluid inlet of the center screw 11 , or the power fluid outlet of the center screw 11 is connected to the power fluid inlet of the edge screw 21 .
[0039] At least two edge transmission shafts 23 are arranged symmetrically along the axis of the cylinder 3 , and at least two center transmission shafts 13 are arranged symmetrically along the axis of the cylinder 3 .
[0040] The ferrule 7 is a cylindrical structure, which is sleeved on the central shaft 18 and fixed by screws. A step is provided on the outer side of the other end of the central shaft 18 to perform axial limiting.
[0041] The rear support plate 2 is a disc-shaped structure, the front support plate 5 is a disc-shaped structure, the two ends of the central screw 11 are placed between the rear support plate 2 and the front support plate 5 and are fixedly connected, and the two ends of the edge screw 21 are placed between the rear support plate 2 and the front support plate 5 and are fixedly connected. The rear support plate 2 is fixedly connected to the cylinder 3, and the front support plate 5 is fixedly connected to the cylinder 3; the rear support plate 2 is screwed to the cylinder 3, and the front support plate 5 is screwed to the cylinder 3.
[0042] The rear support plate 2 is provided with an axial through hole to communicate with the flow channel, and the output shafts of the central screw 11 and the edge screw 21 pass through the front support plate 5 and extend outward.
[0043] The shell end of the center screw 11 is fixed circumferentially with the rear support plate 2 by using a molded surface, or the shell end of the center screw 11 is fixed circumferentially with the front support plate 5 by using a molded surface, or both ends of the shell of the center screw 11 are fixed circumferentially with the rear support plate 2 and the front support plate 5 by using molded surfaces.
[0044] The shell end of the edge screw 21 is fixed circumferentially with the rear support plate 2 by using a molded surface, or the shell end of the edge screw 21 is fixed circumferentially with the front support plate 5 by using a molded surface, or both ends of the shell of the edge screw 21 are fixed circumferentially with the rear support plate 2 and the front support plate 5 by using molded surfaces.
[0045] It also includes a square seat 10, one end of the combined force shaft 17 is inserted into the square seat 10. The square seat 10 and the central shaft 18 are connected by forming holes to transmit torque.
[0046] The rib plate 4 is a disc-shaped structure, which is placed in the cylinder 3 and sleeved in the middle area between the central screw 11 and the edge screw 21. The rib plate 4 plays a role in fixing and supporting the central screw 11 and the edge screw 21. An axial through hole is set in the middle position of the rib plate 4 to pass the power fluid.
[0047] The center disk 6 is a disk-shaped structure. The center disk 6 is placed in the cylinder 3 and fixedly connected to the cylinder 3. The center disk 6 and the cylinder 3 are fixed by pins. The center disk 6 is provided with an axial through hole for passing the power fluid. The center disk 6 is provided with an axial through hole for installing the center transmission shaft 13 and the edge transmission shaft 23.
[0048] The base 8 is a disc-shaped structure, and is fixedly connected to the end of the cylinder 3 ; the base 8 is sleeved on the outside of the force disk 16 , with one end of the base 8 close to the turntable 27 and the other end close to the edge cutting portion 28 .
[0049] The working principle of this embodiment is as follows: The center screw 11 drives the center eccentric rod 14 to rotate through the center coupling 12 and the center transmission shaft 13 in turn. Multiple center eccentric rods 14 rotate synchronously and drive the combined force disk 16 to rotate eccentrically. The combined force disk 16 drives the center shaft 18 to rotate through the combined force shaft 17. The center shaft 18 drives the center cutting part 19 to rotate. The drill bit or cutting teeth 9 outside the center cutting part 19 realize rock breaking.
[0050] The edge screw 21 drives the edge eccentric rod 24 to rotate through the edge coupling 22 and the edge transmission shaft 23 in turn. Multiple edge eccentric rods 24 rotate synchronously and drive the combined force cylinder 26 to rotate eccentrically. The combined force cylinder 26 drives the turntable 27 to rotate along the central axis 18 of the turntable 27. The turntable 27 drives the edge cutting part 28 at its end to rotate, and the drill bit or cutting tooth 9 outside the edge cutting part 28 realizes rock breaking.
[0051] The central screw 11 and the edge screw 21 have opposite rotation directions, so the central cutting part 19 and the edge cutting part 28 have opposite rotation directions, the counter torques generated by rock breaking cancel each other out, and the torque of the rear end pipe string is greatly reduced or even zero, which greatly improves the reliability of drilling. In particular, continuous deflection is often required for pipeline crossing, that is, the pipe string forms a certain arc. The existence of drill string torque is not conducive to maintaining the shape of the pipe string, and it is easy to cause abnormal contact between the pipe string and the well wall.
[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the embodiments of the present invention should be covered within the protection scope of the present invention.
Claims
1. A direct-drive torque-balanced trenchless pipe crossing drill with forward and reverse screws, characterized in that: include: The cylinder body is a cylindrical structure, the central drive assembly is placed in the central area of the cylinder body, and the edge drive assembly is placed in the edge area inside the cylinder body; The central drive assembly includes a central cutting part, and the central drive assembly drives the central cutting part to rotate around its center line. The central drive assembly includes: A central screw whose axis is parallel to the axis of the barrel; A central transmission shaft installed in the cylinder, with an axis parallel to the cylinder axis, at least two in number and arranged symmetrically along the cylinder axis, capable of rotating around its axis; One end is connected to the central screw output shaft, and the other end is connected to the central coupling of the central transmission shaft; The rod-shaped structure has two connecting parts with parallel axes and a spacing, one end of which is circumferentially fixedly connected to the central transmission shaft and the other end of which is rotatably connected to the central eccentric rod; The disc-shaped structure has an edge that rotates and connects to the central eccentric rod, and a resultant disc that is connected to the resultant axis at the center; A resultant shaft with one end connected to the center of the resultant disk and the other end connected to the central axis; the axis of the resultant shaft is parallel to the axis of the central axis and there is a distance between them; the distance between the axes of the connecting parts at both ends of the central eccentric rod is equal to the distance between the axis of the resultant shaft and the central axis; The cylindrical structure has one end connected to the resultant axis and the other end is provided with a central cutting part, and the central axis of the flow hole is arranged near the resultant axis; A disc-shaped structure including an axial flow hole is arranged at one end of the central axis away from the resultant force axis, and a cutting tooth or a central cutting portion of a cutting drill bit is arranged on the side away from the central axis; The edge drive assembly includes an edge cutting portion, and the edge drive assembly drives the edge cutting portion to rotate around its center line. The edge drive assembly includes: The axis is parallel to the axis of the barrel, the rotation direction is opposite to that of the central screw, and the power fluid is connected in series with the edge screw; An edge transmission shaft installed in the cylinder, with an axis parallel to the axis of the cylinder, at least two in number and symmetrically arranged along the axis of the cylinder, capable of rotating around its axis; A marginal coupling having one end connected to the marginal screw output shaft and the other end connected to the marginal transmission shaft; The rod-shaped structure has two connecting parts with parallel axes and a spacing, one end is circumferentially fixedly connected to the edge transmission shaft, and the other end is rotatably connected to the edge eccentric rod; Cylindrical structure, one end is rotatably connected to the edge transmission shaft, and the other end is matched with a cylindrical surface to rotatably connect the combined force cylinder of the turntable; the axis of the turntable is parallel to the axis of the combined force cylinder and there is a distance between them; the distance between the axis of the connecting part at both ends of the edge eccentric rod is equal to the distance between the axis of the turntable and the axis of the combined force cylinder; It is placed at the end of the cylinder, axially fixed and circumferentially rotatably connected with the cylinder, sleeved on the outside of the central axis and relatively rotatable, and a turntable of the edge cutting part is installed at the end away from the combined force cylinder; The annular structure is connected to the turntable, and the cutting teeth or the edge cutting part of the cutting drill bit are arranged on the side away from the turntable.
2. The forward and reverse screw direct-drive torque-balanced trenchless pipeline crossing drilling tool according to claim 1 is characterized in that: The power fluid outlet of the edge screw is connected to the power fluid inlet of the center screw, or the power fluid outlet of the center screw is connected to the power fluid inlet of the edge screw.
3. The forward and reverse screw direct-drive torque-balanced trenchless pipeline crossing drilling tool according to claim 1, characterized in that: The central coupling is a universal coupling, and the edge coupling is a universal coupling.
4. The forward and reverse screw direct-drive torque-balanced trenchless pipeline crossing drilling tool according to claim 1, characterized in that: It also includes a ferrule, which is a cylindrical structure. The ferrule is sleeved on the central shaft and fixed by screws. A step is set on the outer side of the other end of the central shaft and axially limited.
5. The forward and reverse screw direct-drive torque-balanced trenchless pipeline crossing drilling tool according to claim 1, characterized in that: Also included are a rear support plate and a front support plate; The rear support plate is a disc-shaped structure, the front support plate is a disc-shaped structure, the two ends of the central screw are placed between the rear support plate and the front support plate and fixedly connected, the two ends of the edge screw are placed between the rear support plate and the front support plate and fixedly connected; the rear support plate is fixedly connected to the cylinder, and the front support plate is fixedly connected to the cylinder; The rear support plate is provided with an axial through hole to communicate with the flow channel, and the output shafts of the central screw and the edge screw pass through the front support plate and extend outward.
6. The forward and reverse screw direct-drive torque-balanced trenchless pipeline crossing drilling tool according to claim 5, characterized in that: At least one end of the shell of the central screw is circumferentially fixedly connected, and at least one end of the shell of the edge screw is circumferentially fixedly connected.
7. The forward and reverse screw direct-drive torque-balanced trenchless pipeline crossing drilling tool according to claim 1, characterized in that: It also includes a square seat, one end of the combined force shaft is inserted into the square seat, and the square seat and the central shaft are connected by forming holes to transmit torque.
8. The forward and reverse screw direct-drive torque-balanced trenchless pipeline crossing drilling tool according to claim 1, characterized in that: Also includes ribs; The rib plate is a disc-shaped structure, which is placed in the cylinder and sleeved in the middle area of the center screw and the edge screw; the rib plate plays a fixed supporting role for the center screw and the edge screw; an axial through hole is set in the middle position of the rib plate to pass the power fluid.
9. The forward and reverse screw direct-drive torque-balanced trenchless pipeline crossing drilling tool according to claim 1, characterized in that: Also included is a center plate; The center disk is a disk-shaped structure. The center disk is placed in the cylinder and fixedly connected to the cylinder. The center disk and the cylinder are fixed by pins. The center disk is provided with an axial through hole for passing the power fluid. The center disk is provided with an axial through hole for installing the center transmission shaft and the edge transmission shaft.
10. The forward and reverse screw direct-drive torque-balanced trenchless pipeline crossing drilling tool according to claim 1, characterized in that: Also includes a base; The base is a disc-shaped structure, and the base is fixedly connected to the end of the cylinder; the base is sleeved on the outside of the turntable, one end of the base is close to the turntable, and the other end is close to the edge cutting part.