Rack type pipe pushing machine

Abstract

The invention provides a rack type pipe pushing machine which comprises a base, a pushing mechanism is arranged on the base, the pushing mechanism is connected with a pipe holding device, the pushing mechanism comprises a first pushing mechanism and a second pushing mechanism, the first pushing mechanism comprises a first driving box and a first gear transmission mechanism, and the second pushing mechanism comprises a second driving box and a second gear transmission mechanism. The second propelling mechanism comprises a second driving box, a second gear transmission mechanism, a first one-way wheel and a second one-way wheel, the pipe holding devices comprise the first pipe holding device and the second pipe holding device, and the first driving box and the second driving box drive the first pipe holding device and the second pipe holding device to slide on the base respectively. When a pipeline needs to be conveyed, the second driving mechanism is controlled to achieve decelerated movement of the pipe holding device through the second gear transmission mechanism, when the pipe holding device needs to return, the second driving mechanism directly drives the driving gear to rotate, then the rightward resetting speed of the second pipe holding device is high, the resetting time is shortened, and the efficiency is improved.

Description

Technical Field

[0001] The present invention relates to pipeline laying equipment, and particularly to a rack-type pipe pusher. Background Art

[0002] Pipeline transportation is one of the three major modern transportation modes. Due to its advantages such as high efficiency, low cost, less land occupation, and being less affected by the environment, it is increasingly widely used in energy supply, petrochemical industry, and residential life systems, and is the lifeline of modern cities. The horizontal directional drilling technology is the most widely used technology for pipeline laying at home and abroad at present. However, during the back-reaming process of directional drilling, due to factors such as the complexity of the geology and the rated tensile force that the drill pipe can withstand, there are still many limitations. In the horizontal directional crossing of large-diameter, long-distance, and complex geological rivers, problems such as stuck drill pipes and breakage and disconnection of drill pipes are likely to occur. In view of the above situation, Herrenknecht of Germany combined the characteristics of microtunneling construction and horizontal directional drilling technologies to propose the direct pipe laying method. The direct pipe laying method is a relatively advanced pipeline laying method at present, which is a new type of trenchless pipeline construction technology with less construction land occupation, fast speed, and the ability to retract. The direct pipe laying method can lay prefabricated pipes into the ground with the help of a thrust device, namely a "pipe pusher", in a single continuous pipeline. However, the above pipe pusher directly uses a long-stroke and large-thrust hydraulic cylinder to push the pipe. Such a hydraulic cylinder has a large manufacturing difficulty and a high manufacturing cost, and there are still deficiencies during the directional drilling crossing process. For example, the pipe pusher equipment is relatively large, resulting in a large construction site, deep foundation excavation, environmental damage, and high equipment costs; the pipe diameter is limited (for larger diameters, a larger supporting tunnel boring machine needs to be equipped, resulting in high costs); while smaller pipe pushers face problems such as limited crossing length, insufficient thrust, and the pipe cannot be buried too deep; especially the discontinuity of pipeline laying greatly affects the construction process, making the pipe pusher require a large starting force when starting, stopping, and restarting, and thus it is easy to cause the pipe to get stuck due to problems such as trajectory bending or falling objects.

[0003] In the prior art, the patent publication number CN110529658A discloses a rack-type pipe pusher, including a base, on which a propulsion mechanism is provided, and the propulsion mechanism is connected with a pipe gripper; the propulsion mechanism includes a propulsion seat and a rack, where the rack is arranged on the base, a drive shaft is installed on the propulsion seat, the drive shaft is driven to rotate by a power source, and a propulsion gear is installed on the drive shaft, and the propulsion gear meshes with the rack; the pipe gripper is arranged on the propulsion seat. The remarkable effect of adopting the present invention is that both the manufacturing difficulty and the manufacturing cost are relatively low, the equipment volume is smaller, it can adapt to pipe pushing of various pipe diameters, and the stability is better.

[0004] The above technical solution solves the problem that it is inconvenient to directly use a hydraulic cylinder to push in the prior art. However, in actual use of the above technical solution, due to the limitation of its working principle, after the propulsion mechanism advances the pipeline a certain stroke, it needs to release the pipeline and move backward to the original position to perform the next pipe retraction. The time required for the reverse stroke is basically close to the time required for the forward propulsion. Therefore, half of the time is in a non-pipe-pushing state, resulting in a reduction in pipe-pushing efficiency. Moreover, in the prior art during the return, the pipeline is in a static state or moves outward under the action of the reverse acting force at the pipeline insertion position, which also to a certain extent leads to a reduction in pipe-pushing efficiency. And when the pipeline moves outward in the reverse direction, the extrusion stress on the pipeline disappears, and re-extrusion during the next pipe-pushing may cause the movement path of the pipeline to deviate. Summary of the Invention

[0005] The purpose of the present invention is to provide a rack-type pipe-pushing machine that can improve the pipe-pushing efficiency.

[0006] The present invention is implemented as follows:

[0007] The present invention provides a rack-type pipe-pushing machine, including a base, on which a propulsion mechanism is provided. The propulsion mechanism is connected with a pipe gripper. It is characterized in that the propulsion mechanism includes a rack arranged along the length direction of the base, and a first propulsion mechanism and a second propulsion mechanism respectively cooperating with the corresponding rack. The first propulsion mechanism includes a first drive box, in which a first drive mechanism and a first gear transmission mechanism are provided. The first gear transmission mechanism cooperates with the rack on the base. The second propulsion mechanism includes a second drive box, in which a second drive mechanism, a second gear transmission mechanism, a first one-way wheel and a second one-way wheel are provided. A first one-way wheel is sleeved on the output end of the second drive mechanism. The first one-way wheel cooperates with the second gear transmission mechanism. The second one-way wheel is arranged on the last-stage drive gear shaft of the second gear transmission mechanism and is in clutch cooperation with the output shaft of the second drive mechanism. The pipe gripper includes a first pipe gripper and a second pipe gripper. The first drive box and the second drive box respectively drive the first pipe gripper and the second pipe gripper to slide on the base.

[0008] According to the above technical solution, the first pipe gripper and the second pipe gripper have the same structure, and both include a sliding seat slidably connected to the base and a rotating ring hinged to the sliding seat. The sliding seat and the rotating ring respectively have a semi-circular space, and the two are buckled for clamping the pipeline. Clamping telescopic cylinders are respectively provided on the rotating ring and the sliding seat. The end of the telescopic cylinder is provided with a flexible clamping block for contacting the pipeline. A plurality of clamping telescopic cylinders are circumferentially and evenly arranged.

[0009] According to the above technical solution, the flexible clamping block includes a clamping block and a ball head hinge connected to the outer end of the telescopic rod of the clamping telescopic cylinder. The ball head hinge is connected to the clamping block, and the clamping block is also connected to the inner side of the rotating ring or the inner side of the sliding seat through a spring.

[0010] According to the above technical solution, there are multiple springs, which are distributed in a triangular shape or symmetrically on both sides of the clamping block.

[0011] According to the above technical solution, the surface of the clamping block in contact with the pipeline is arc-shaped.

[0012] According to the above technical solution, a rotating ring driving mechanism for driving the rotating ring to rotate relative to the sliding seat is configured on each pipe gripper.

[0013] According to the above technical solution, the rotating ring driving mechanism includes a rotating hydraulic motor, a worm connected to the output shaft of the rotating hydraulic motor, and an incomplete turbine engaged with the worm. The rotating hydraulic motor and the incomplete turbine are respectively arranged on the rotating ring and the sliding seat.

[0014] According to the above technical solution, a clamping nozzle and a locking device for locking the clamping nozzle are provided at the joint of the rotating ring and the sliding seat.

[0015] According to the above technical solution, the first gear transmission mechanism and the second gear transmission mechanism include a first gear, a second gear, a third gear, a fourth gear, a fifth gear, a sixth gear, and a driving gear. Among them, the second gear and the third gear are coaxially arranged, the fourth gear and the fifth gear are coaxially arranged, and the sixth gear and the driving gear are coaxially arranged. The gear ratios of the first gear transmission mechanism and the second gear transmission mechanism form a speed reduction transmission mechanism.

[0016] According to the above technical solution, the first gear of the second gear transmission mechanism is sleeved on the first one-way wheel. The first one-way wheel is arranged on the output shaft of the second driving mechanism. The second one-way wheel is sleeved on the driving gear shaft and is in a clutch connection with the output shaft of the second driving hydraulic motor.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention solves the problem that after the propulsion mechanism advances the pipeline a certain stroke, it needs to release the pipeline and move backward to the original position to perform the next pipe retraction. The time required for the reverse stroke is basically close to the time required for forward propulsion. Therefore, half of the time is in a non-pipe-pushing state, resulting in a reduction in pipe-pushing efficiency. That is, by setting the first one-way wheel and the second one-way wheel, when the pipeline needs to be conveyed, the first one-way wheel is in the engaged state, and the second one-way wheel is in the disengaged state. The second driving mechanism is controlled to realize the decelerated movement of the pipe gripper through the second gear transmission mechanism. When the pipe gripper needs to return to its position, the first one-way wheel is controlled to be in the disengaged state, and the second one-way wheel is combined with the output shaft of the second gear transmission mechanism, so that the second driving mechanism directly drives the driving gear to rotate, thereby realizing a faster rightward reset speed of the second pipe gripper, reducing the time required for resetting, and increasing the efficiency.

[0019] 2. When the pipeline deviates by a certain angle, by setting the flexible clamping block, the flexible clamping block can rotate correspondingly on the ball head, thereby adapting to the angle change and avoiding damage to the pipeline caused by rigid connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0021] Figure 1 It is the front view of a rack-type pipe pusher provided by an embodiment of the present invention.

[0022] Figure 2 It is the side cross-sectional view of the pipe gripper provided by an embodiment of the present invention.

[0023] Figure 3 It is the structural schematic diagram of the clamping block provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, 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.

[0025] Accordingly, 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 selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0026] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it will not be necessary to further define and explain it in subsequent figures.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0028] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0029] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly under and obliquely under the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0031] The features and performance of the present invention will be further described in detail below in conjunction with embodiments.

[0032] As Figure 1 , 2 shown, this embodiment provides a rack-type pipe pusher, including a base 1, on which a propulsion mechanism is provided. The propulsion mechanism is connected with a pipe gripper. The propulsion mechanism includes a rack 8 arranged along the length direction of the base 1 and a first propulsion mechanism (located in the left part of Figure 1 ) and a second propulsion mechanism (located in the right part of Figure 1 ) respectively cooperating with the corresponding racks. The pipe gripper includes a first pipe gripper and a second pipe gripper. The first propulsion mechanism includes a first drive box 10, and the first drive box is connected with the first pipe gripper. A first drive mechanism and a first gear transmission mechanism are arranged in the first drive box 10. The first gear transmission mechanism cooperates with the rack 8 on the base to realize the propulsion of the first drive box 10 driven by the first drive mechanism through the first gear transmission mechanism, and further drives the first pipe gripper to move on the base. The second propulsion mechanism includes a second drive box 29, and the second drive box 29 is connected with the second pipe gripper. A second drive mechanism, a second gear transmission mechanism, a first one-way wheel 20 and a second one-way wheel 21 are arranged in the second drive box 29. Among them, both the first one-way wheel 20 and the second one-way wheel 21 are one-way wheel structures with one-way movement and reverse separation. The output end of the second drive mechanism is sleeved with the first one-way wheel 20, the first gear of the second gear transmission mechanism is sleeved on the first one-way wheel 20, the second one-way wheel 21 is arranged on the last-stage drive gear shaft of the second gear transmission mechanism, and it is in clutch cooperation with the output shaft of the second drive mechanism. The drive gear of the second gear transmission mechanism meshes with the rack to realize the propulsion of the second drive box 29 by the second drive mechanism through the second gear transmission mechanism, and further drives the second pipe gripper to move on the base.

[0033] In this embodiment, the second gear transmission mechanism has the same structure as the first gear transmission mechanism, and both include a first gear 12, a second gear 11, a third gear 9, a fourth gear 7, a fifth gear 6, a sixth gear 5, and a driving gear 4. Among them, the second gear 11 and the third gear 9 are coaxially arranged, the fourth gear 7 and the fifth gear 6 are coaxially arranged, and the sixth gear 5 and the driving gear 4 are coaxially arranged. Among them, the diameter of the second gear is larger than that of the first gear, the diameter of the third gear is smaller than that of the second gear, the diameter of the fourth gear is larger than that of the third gear, and the diameter of the fifth gear is smaller than that of the fourth gear, finally forming a speed reduction transmission mechanism. Both the first and second driving mechanisms are driving hydraulic motors 13. Through the design of this speed reduction transmission mechanism, its propulsion power can be increased. In the second gear transmission mechanism, a first one-way wheel 20 is installed on the output shaft of the second driving hydraulic motor 28. The first gear is sleeved on the first one-way wheel 20 and meshes with the second gear 30. The second one-way wheel 21 is arranged on the driving gear shaft and is configured to be disengaged from the output shaft of the second driving hydraulic motor 28. When a conveying pipeline is needed, the first one-way wheel 20 is in a combined state at this time, and the second one-way wheel is in a separated state at this time. At this time, control the driving hydraulic motor to realize the decelerated movement of the pipe gripper through the second gear transmission mechanism. When a return position is needed, control the first one-way wheel 20 to be in a separated state. The output shaft of the second driving hydraulic motor drives the second one-way wheel 21 to rotate. The second one-way wheel 21 drives the sixth gear to rotate. The rotation of the sixth gear drives the driving gear to rotate. The rotation of the driving gear drives the second pipe gripper to move to the right. Since the hydraulic driving motor directly drives the driving gear to rotate, the speed of the second pipe gripper moving to the right for reset is relatively fast, reducing the time required for reset and increasing the efficiency.

[0034] In this embodiment, the first pipe gripper and the second pipe gripper have the same structure, and both include a sliding seat 3 slidably connected to the base and a rotating ring 14 hinged to the sliding seat. The sliding seat 3 and the rotating ring 14 respectively have semi-circular spaces, and the two are buckled to clamp the pipeline. Clamping telescopic cylinders 18 are respectively arranged on the rotating ring and the sliding seat. The end of the telescopic cylinder is configured with a flexible clamping block for contacting the pipeline, and a plurality of clamping telescopic cylinders are arranged circumferentially and evenly. In this embodiment, 3 groups of clamping telescopic cylinders 18 are arranged circumferentially.

[0035] As Figure 2 shown, the flexible clamping block includes a clamping block 25 and a ball head hinge 27 connected to the outer end of the telescopic rod of the clamping telescopic cylinder. The ball head hinge 27 is connected to the clamping block 25, and the clamping block 25 is also connected to the inner side of the rotating ring or the inner side of the sliding seat through a spring. The springs are multiple and are distributed in a triangular shape or symmetrically on both sides of the clamping block. In this embodiment, they are arranged at a triangular angle (as Figure 3As shown, the force is more evenly distributed. Among them, the surface of the clamping block 25 in contact with the pipeline is arc-shaped. By setting the flexible clamping block, when the pipeline deviates at a certain angle, the clamping block can rotate correspondingly on the ball head, thereby adapting to the angle change and avoiding damage to the pipeline caused by rigid connection.

[0036] In this embodiment, a rotating ring driving mechanism for driving the rotating ring to rotate relative to the sliding seat is configured on each pipe gripper to realize the automatic operation of the entire device and improve the construction efficiency. The rotating ring driving mechanism includes a rotating hydraulic motor 15, a worm 16 connected to the output shaft of the rotating hydraulic motor, and an incomplete turbine 17 engaged with the worm. The rotating hydraulic motor and the incomplete turbine are respectively arranged on the rotating ring 14 and the sliding seat 3.

[0037] In this embodiment, a clamping nozzle 23 and a locking device 22 for locking the clamping nozzle are provided on the joint plate 24 of the rotating ring 14 and the sliding seat 3.

[0038] In this embodiment, a plurality of limiting plates 2 are installed at intervals on the base. When the left sliding seat 29 moves to the position of the limiting plate 2, the right one also moves to the corresponding limiting plate position. An induction radar 19 is installed on the right side of the right rotating ring. When the induction radar 19 senses the tail end of the pipeline, the driving hydraulic motor 13 of the second propulsion mechanism stops rotating and then reverses, and then the rotating ring 14 moves to the left.

[0039] During use, when it is necessary to open the rotating ring 14, control the rotating drive motor 15 to work to drive the worm 16 to rotate. The rotation of the worm 16 drives and acts on the incomplete worm gear 17 to drive the rotating ring 14 to open. After the rotating ring 14 is opened, hoist the pipeline onto the sliding seat 3, and then the rotating hydraulic motor 14 rotates to drive the worm 16 and further drive the rotating ring 14 to close. After the rotating ring 14 is closed, the locking device 22 drives the clamping nozzle 23 to clamp the joint plate 24, thereby playing a fixing role.

[0040] As Figure 1As shown, the second propulsion mechanism on the right is propelled. Specifically, as shown in the figure, the clamping telescopic cylinder 18 on the right acts to drive the clamping block 25 to clamp the pipeline. Then, the hydraulic motor is driven to work to drive the first one-way wheel 20 to rotate. The rotation of the first one-way wheel 20 drives the second gear to rotate. The rotation of the second gear drives the third gear to rotate. The rotation of the third gear drives the fourth gear to rotate. The rotation of the fourth gear drives the fifth gear to rotate. The rotation of the fifth gear drives the sixth gear to rotate. The rotation of the sixth gear drives the driving gear to rotate. At this time, the second one-way wheel 21 is in a separated state. Furthermore, the rotation of the driving gear drives the sliding seat 3 to move leftward as a whole. The leftward movement of the sliding seat 3 drives the pipeline to move leftward, thus realizing pipe pushing. When the sliding seat moves to the position of the limit plate 2, the clamping telescopic cylinder on the sliding seat 3 on the left acts to drive the clamping block to clamp the pipeline. Then, the clamping telescopic cylinder on the right is loosened. The first driving box 10 on the left and the second driving box 28 on the right work simultaneously. The first driving box 10 on the left drives the sliding seat 3 to move leftward. The driving hydraulic motor on the second driving box 28 on the right works to drive the first one-way wheel 20 to rotate. The first one-way wheel 20 is in a separated state at this time. The rotation of the first one-way wheel 20 drives the second one-way wheel 21 to rotate. The second one-way wheel is combined with the output shaft of the second driving hydraulic motor at this time. The second one-way wheel 21 drives the sixth gear to rotate. The rotation of the sixth gear drives the driving gear to rotate. The rotation of the driving gear drives the rotating ring to move rightward. Since the hydraulic driving motor directly drives the driving gear to rotate, the speed of the rightward reset of the sliding seat is relatively fast, reducing the time required for reset and increasing the efficiency.

[0041] When the sliding seat moves to the right end of the rack or the induction radar senses the edge of the pipeline, the hydraulic driving motors on the left and right stop simultaneously. And the clamping telescopic cylinder on the right acts first to drive the clamping block to clamp the pipeline, and then the above process is repeated.

[0042] When the pipeline deviates at a certain angle, the clamping block can rotate correspondingly on the ball head, thus adapting to the angle change and avoiding damage to the pipeline caused by rigid connection.

[0043] The embodiments described above are some, rather than all, of the embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

Claims

1. A rack-type pipe pusher, comprising a base, on which a propulsion mechanism is provided, and the propulsion mechanism is connected with a pipe gripper. Characterized in that, The propulsion mechanism includes a rack arranged along the length direction of the base, and a first propulsion mechanism and a second propulsion mechanism respectively cooperating with the corresponding rack. The first propulsion mechanism includes a first drive box, in which a first drive mechanism and a first gear transmission mechanism are provided. The first gear transmission mechanism cooperates with the rack on the base. The second propulsion mechanism includes a second drive box, in which a second drive mechanism, a second gear transmission mechanism, a first one-way wheel and a second one-way wheel are provided. A first one-way wheel is sleeved on the output end of the second drive mechanism. The first one-way wheel cooperates with the second gear transmission mechanism. The second one-way wheel is arranged on the last-stage drive gear shaft of the second gear transmission mechanism, and is in clutch cooperation with the output shaft of the second drive mechanism. The pipe gripper includes a first pipe gripper and a second pipe gripper. The first drive box and the second drive box respectively drive the first pipe gripper and the second pipe gripper to slide on the base.

2. The rack-type pipe pusher according to claim 1, Characterized in that, The first pipe gripper and the second pipe gripper have the same structure, and both include a sliding seat slidably connected to the base and a rotating ring hinged to the sliding seat. The sliding seat and the rotating ring respectively have a semi-circular space, and the two are buckled for clamping the pipeline. Clamping telescopic cylinders are respectively provided on the rotating ring and the sliding seat. The end of the telescopic cylinder is provided with a flexible clamping block for contacting the pipeline, and a plurality of clamping telescopic cylinders are arranged circumferentially and evenly.

3. The rack-type pipe pusher according to claim 2, Characterized in that, The flexible clamping block includes a clamping block and a ball head hinge member connected to the outer end of the telescopic rod of the clamping telescopic cylinder. The ball head hinge member is connected to the clamping block, and the clamping block is also connected to the inner side of the rotating ring or the inner side of the sliding seat through a spring.

4. The rack-type pipe pusher according to claim 3, Characterized in that, There are multiple springs, which are distributed in a triangular shape or symmetrically on both sides of the clamping block.

5. The rack-type pipe pusher according to claim 3, Characterized in that, The surface of the clamping block in contact with the pipeline is arc-shaped.

6. The rack-type pipe pusher according to claim 2, Characterized in that, On each pipe gripper, a rotating ring drive mechanism for driving the rotating ring to rotate relative to the sliding seat is configured.

7. The rack-type pipe pusher according to claim 6, Characterized in that, The rotating ring drive mechanism includes a rotating hydraulic motor, a worm connected to the output shaft of the rotating hydraulic motor, and an incomplete turbine cooperating with the worm. The rotating hydraulic motor and the incomplete turbine are respectively arranged on the rotating ring and the sliding seat.

8. The rack-type pipe pusher according to claim 2, Characterized in that, A clamping nozzle and a locking device for locking the clamping nozzle are provided at the joint of the rotating ring and the sliding seat.

9. The rack-type pipe pusher according to claim 1 or 2, Characterized in that, The first gear transmission mechanism and the second gear transmission mechanism include a first gear, a second gear, a third gear, a fourth gear, a fifth gear, a sixth gear, and a driving gear. Among them, the second gear and the third gear are coaxially arranged, the fourth gear and the fifth gear are coaxially arranged, and the sixth gear and the driving gear are coaxially arranged. The gear ratios of the first gear transmission mechanism and the second gear transmission mechanism form a speed reduction transmission mechanism.

10. The rack-type pipe pusher according to claim 9, characterized in that, The first gear of the second gear transmission mechanism is sleeved on the first one-way wheel. The first equivalent wheel is arranged on the output shaft of the second driving mechanism. The second one-way wheel is sleeved on the driving gear shaft and is in a clutch connection with the output shaft of the second driving hydraulic motor.

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