A pipe rack library, drilling floor and overhaul automation system

Abstract

This invention discloses an automated system for pipe laying, drilling rig, and workover, primarily relating to the field of well workover equipment. Multiple workstation channels are linearly arranged on the bottom frame. Each workstation channel has a drive sprocket and a driven sprocket at both ends, surrounded by a loop chain. A lower workstation that mates with the bottom of the tubing is arranged on the loop chain. An outer shaft runs through the center of all drive sprockets and is driven to rotate by a drive device. A rotating sleeve, fixed to the drive sprocket, is rotatably fitted onto the outer shaft at the corresponding position. A cylindrical pin, sliding radially, is provided on the side wall of the outer shaft at the position corresponding to the rotating sleeve. One or more slots are provided on the inner ring of the rotating sleeve to mate with the cylindrical pin. Inserting the cylindrical pin into the slot limits the circumferential positioning of the rotating sleeve relative to the outer shaft. The advantages of this invention are: independent automatic control of pipe laying, enabling positioning and advancement at the bottom of the tubing, parallel operation with other robotic arms and lifting clamps to improve efficiency, and the ability to achieve unmanned automated pipe laying operations.

Description

Technical Field

[0001] This invention relates to the field of well workover equipment, specifically a pipe storage tank, drilling platform, and overhaul automation system. Background Technology

[0002] In well workover operations, tubing transport and arrangement is one of the core processes, especially in large-scale workovers in small areas, which involve the on-site storage and placement of various tubing strings such as sucker rods, tubing, and drill collars. In traditional operations, tubing is usually picked up, moved, and placed one by one with manual assistance or simple robotic arms, lacking a systematic storage and automatic tubing arrangement device.

[0003] Existing well workover sites typically have two tubing bridges and a drill rig riser bridge. Vertical tubing strings are stored on the drill rig, usually using the second-level riser support beams. The tubing string typically consists of two connected tubing lines, approximately 19-20 meters long. Most sites rely on manual placement from the second-level riser, which is high-altitude work and poses significant safety hazards. Some sites use a combination of a drill rig robotic arm and a second-level riser robotic arm for placement. However, after the bottom robotic arm pushes the tubing string to the designated position on the drill rig, the second-level riser robotic arm then pushes it to the corresponding support beam position. The second-level riser robotic arm is controlled remotely via a camera, requiring highly skilled operators and prone to misalignment, resulting in long operation times and low efficiency.

[0004] Meanwhile, existing equipment lacks a dedicated automated storage and arrangement device for vertical tubing strings, thus lacking a complete automation foundation. Current mainstream approaches focus on the movement and transport of tubing in a horizontal position. These solutions typically employ horizontal guide rails and chain conveyors to maintain the tubing's horizontal orientation as it moves between workstations. However, before docking with the drilling rig's robotic arm or the second-level platform's finger beam, an additional tilting mechanism must convert the tubing string to an upright position. If both are executed in parallel, motion coupling leads to complex trajectory planning, increased control difficulty, and the tubing string is prone to swaying during dynamic tilting, affecting grasping accuracy.

[0005] Furthermore, for the lateral transport of tubing in an upright position, existing technologies mainly rely on a two-tiered platform tubing arrangement mechanism. However, the two-tiered platform has a narrow space, a lightweight structure, and a limited stroke and weak driving force for the tubing pushing mechanism. When the tubing is upright, its center of gravity is high and its length-to-diameter ratio is large, making it prone to swaying and tilting during lateral pushing at a high position. When there are many tubing columns arranged densely, the operating space and power reserve of the two-tiered platform are limited, making it difficult to achieve stable and efficient lateral transport. Manual intervention is often required, which weakens the continuous operation capability of the automated system.

[0006] In summary, existing equipment lacks effective intermediate connection methods in the process of conveying and loading / unloading oil pipes. The action sequences of the two levels are fixed, making it difficult to dynamically adjust the cooperation strategy according to real-time working conditions. Especially in complex overhaul processes, when the tubing specifications change frequently and the operation rhythm is adjusted frequently, the system is unable to respond quickly. Summary of the Invention

[0007] The purpose of this invention is to provide an automated system for tubing storage, drilling rigs and overhauls, which can achieve positioning and propulsion at the bottom of the tubing, and can be flexibly controlled and driven separately, with a compact structure.

[0008] To achieve the above objectives, the present invention employs the following technical solution: A pipe rack includes a bottom frame with multiple station channels arranged linearly on the bottom frame. Each station channel has a drive sprocket and a driven sprocket at both ends. A spiral chain is wrapped between the drive sprocket and the driven sprocket. A lower station that mates with the bottom end of the oil pipe is arranged on the spiral chain. An outer shaft is horizontally inserted through the center of all the drive sprockets. The outer shaft is rotatably mounted relative to the station channel and is driven to rotate by a drive device. A rotating sleeve fixed to the drive sprocket is rotatably sleeved on the outer shaft at the position corresponding to the drive sprocket. A cylindrical pin with a retractable movement along its radial direction is provided on the side wall of the outer shaft at the position corresponding to the rotating sleeve. The inner ring of the rotating sleeve has one or more slots that mate with the cylindrical pin. The cylindrical pin is inserted into the slot to limit the circumferential movement of the rotating sleeve relative to the outer shaft.

[0009] The drive device includes any one of a hydraulic motor, a pneumatic motor, an electric motor, and an internal combustion engine, and the drive device achieves transmission with the outer shaft through any one of belt drive, chain drive, and gear drive.

[0010] The outer shaft is a hollow shaft with an inner hole extending through it along its axial direction. A mandrel, independent of the mandrel, is coaxially fitted inside the inner hole. The mandrel has a linear translational movement along its axial direction. The mandrel has cams of the same number as the rotating sleeves along its axis. The outer edge of the cam is close to the inner wall of the inner hole. A pin sleeve is provided on the outer shaft corresponding to the middle of each rotating sleeve, extending radially through it. The cylindrical pin is set inside the pin sleeve and slides with the pin sleeve radially along the rotating sleeve. When the outer edge of the cam contacts the inner end of the cylindrical pin, the outer end of the cylindrical pin is inserted into the groove of the rotating sleeve at that position. The spacing between adjacent cams is not equal.

[0011] The spacing between adjacent cams increases by an equal increment.

[0012] One or both ends of the mandrel are provided with coaxial extensions. A connecting frame is fixed to the outer end of the extension. An electric cylinder and a sliding sleeve are provided on the outermost work station channel near the mandrel. A piston rod is telescopically fitted at one end of the electric cylinder. A guide rod is linearly slidably fitted inside the sliding sleeve. The guide rod and the piston rod are arranged parallel to each other relative to the mandrel. One end of the guide rod and the end of the piston rod are both fixed to the connecting frame.

[0013] The bottom frame is a rectangular frame structure. Angle steel with downward-facing inside corners is fixed at the four corners of the bottom frame. A positioning post is provided at the inside corner of the angle steel. A positioning pin is provided at the center of the top of the positioning post. The bottom end of the positioning post is welded and fixed to the drilling platform. The top of the angle steel is provided with a mounting hole for the positioning pin to pass through.

[0014] The loop chain includes an outer chain plate. Each set of lower workstations includes a pallet, a tray, a lower support platform, and an upper support platform fixed from bottom to top. There are two pallets, each fixed to the outer chain plate on the same side. The projection range of the tray, the lower support platform, and the upper support platform decreases. The upper support platform, the lower support platform, and the tray are provided with a through hole structure from top to bottom.

[0015] The workstation channel includes two vertically arranged strip plates arranged side by side. The spiral chain is disposed between the two strip plates. A track platform is provided on the inner end face of the strip plates. The spiral chain includes an inner link, an outer link, and a pin. A roller is provided at the outer end of the pin. The bottom circumferential surface of the roller contacts and engages with the top surface of the track platform. An outwardly extending flange structure is provided on the inner side of the roller. The flange structure is located on the inner side of the track platform.

[0016] A drilling platform, wherein the drilling platform is provided with the pipe bank, and the bottom frame is fixedly connected or detachably fixedly connected to the top surface of the drilling platform.

[0017] An automated overhaul system includes a two-tiered work platform and a bottom drilling platform arranged opposite each other. The drilling platform is equipped with the pipe bank. The bottom frame is fixedly or detachably fixedly connected to the top surface of the drilling platform.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: By storing the tubing in an upright position in multiple linear stations on the drilling rig, and using a chain-based conveyor structure to continuously and stably feed the robotic arm from the lower station, the tubing remains vertical during the feeding action. This eliminates the time loss of the robotic arm waiting for the posture adjustment to be completed, and also avoids the complexity and control difficulty of trajectory planning when gripping and posture adjustment are performed in parallel. When the robotic arm grips, the position of the tubing is determined and the posture is stable. There is no need to track and predict the posture of the tubing during the dynamic process. The alignment accuracy and repeatability of the gripping point are significantly improved, thus improving the efficiency of the overall overhaul operation.

[0019] In terms of drive flexibility, the outer shaft and the rotating sleeve achieve selective circumferential engagement through a telescopic cylindrical pin. A single drive shaft can sequentially drive multiple sets of workstation channels without the need for a separate power unit for each workstation, simplifying the structure and control logic of the drive system. At the same time, the mechanical cooperation between the cylindrical pin and the cam achieves workstation interlocking and independence in a defined sequence, reducing dependence on complex electrical control systems and improving reliability and maintenance convenience under harsh field conditions. Attached Figure Description

[0020] Figure 1 This is an overall schematic diagram of the invention (only the upper chain is shown for ease of structural demonstration).

[0021] Figure 2 This is a schematic diagram of the structure of a single-row workstation channel of the present invention.

[0022] Figure 3 This is a side view of the present invention.

[0023] Figure 4 This is a partial front view of the present invention.

[0024] Figure 5 This is a schematic diagram of the outer and inner shaft portions of the present invention.

[0025] Figure 6 This is a partial schematic diagram of the internal structure of the outer shaft of the present invention.

[0026] Figure 7 This is a schematic diagram of the axial cross-section of the outer shaft of the present invention.

[0027] The labels shown in the attached diagram: 1. Bottom frame; 2. Angle steel; 3. Positioning post; 4. Positioning pin; 5. Workstation channel; 6. Strip plate; 7. Hobbit chain; 9. Drive sprocket; 10. Driven sprocket; 11. Support roller; 12. Track platform; 13. Flange structure; 14. Support plate; 15. Pallet; 16. Lower support platform; 17. Upper support platform; 18. Outer shaft; 19. Rotating sleeve; 20. Inner hole; 21. Mandrel; 22. Pin sleeve; 23. Cylindrical pin; 24. Cam; 25. Drive wheel; 26. Driven wheel; 27. Connecting frame; 28. Electric cylinder; 29. ​​Guide rod; 30. Sliding sleeve; 31. Extension; 32. Slot. Detailed Implementation

[0028] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0029] As part of the overhaul automation system, the pipe rack subsystem includes the drilling platform pipe rack module and the second-floor pipe rack module. The two work together to complete the single-row movement of the pipe string, enabling the outermost drilling platform robotic arm to grasp the pipe string and achieve positional interaction.

[0030] The drilling platform pipework module is located below the second-level platform, specifically on the well workover drilling platform, and consists of a chain box pipework unit fixed on the drilling platform.

[0031] like Figures 1 to 7 As shown, the chain box tube storage unit includes a bottom frame 1, which is a square frame structure welded from channel steel, serving as the bottom support structure for the entire chain box tube storage unit. Angle steel 2 extending outwards is provided at the corners of the bottom frame 1. An installation hole is passed through the top of the angle steel 2, and the inside corner of the angle steel 2 is oriented downwards. A positioning post 3 is provided at the inside corner of the angle steel 2, and a positioning pin 4 is centrally located at the top of the positioning post 3. The bottom end of the positioning post 3 is welded and fixed to a drilling platform for quick positioning and assembly. When installing the entire chain box tube storage unit, the bottom frame 1 is placed on the drilling platform, aligning the installation hole with the positioning post 3. The positioning pin 4 passes through the installation hole to precisely install and fix the bottom frame 1 on the drilling platform. The height of the positioning post 3 is adapted to the distance from the top of the inside corner to the bottom surface of the bottom frame 1, ensuring that the bottom surface of the bottom frame 1 rests on the drilling platform after fixing. The entire chain box tube storage unit can be hoisted and moved, enabling flexible transfer, installation, and use.

[0032] Six bottom beams are installed and fixed at equal intervals within the bottom frame 1 to support the components above. The bottom beams are arranged along the width direction of the bottom frame 1.

[0033] The bottom beam is fixed with 14 sets of workstation channels 5. Each set of workstation channels 5 consists of a pair of symmetrically arranged "=" strip-shaped uprights 6. The two strip-shaped uprights 6 are fixed together by multiple mounting pins. The mounting pins can be set at both ends or the bottom without affecting the forward and backward movement of the top workstation. The strip-shaped uprights 6 form equally spaced channels, forming a row of workstation channels 5 for the installation of chains and workstation components. The bottom of each set of workstation channels 5 has an open structure to facilitate the discharge of oily wastewater.

[0034] A loop chain 7, arranged along its length, is installed within the workstation channel 5. The loop chain 7 is a heavy-duty roller chain, and sprockets are rotatably mounted at both ends of the loop chain at both ends of the workstation channel 5. The loop chain winds between the sprockets to form a closed-loop rotation path. Based on their different transmission functions, the sprockets at both ends of the same set of workstation channels 5 are defined as a driving sprocket 9 and a driven sprocket 10, respectively.

[0035] Regarding the specific structure of the loop chain, the roller chain is composed of alternating inner and outer links. In each link, the inner link plate, sleeve, and roller constitute the inner link, and the outer link plate and pin constitute the outer link. The inner and outer links are hinged through the clearance fit between the pin and the sleeve to form a flexible transmission chain.

[0036] Based on the existing roller chain structure, this loop chain has a support plate 14 bent at a right angle to the outer side of the outer chain plate. The support plates 14 on both sides opposite to the outer chain plate are arranged in opposite directions to form a pair of "┐┌" shaped support structures. A tray 15 is fixed between the two opposite support plates 14. A lower support platform 16 and an upper support platform 17 are fixed on the upper tray 15 in sequence. The lower support platform 16 and the upper support platform 17 are coaxially fixed in the center of the tray 15. The upper support platform 17, the lower support platform 16, and the tray 15 have a through hole structure from top to bottom for draining oily wastewater. The upper support platform 17 is fitted with the bottom end of a φ73 oil pipe, and after insertion, the bottom end of the oil pipe rests on the top annular end face of the lower support platform 16. The lower support platform 16 is fitted with the bottom end of φ89 and φ114 oil pipes, and after insertion, the bottom end of the oil pipe rests on the top surface of the tray 15, realizing the adaptation of two common oil pipes. This provides support and positioning for the bottom of the tubing, and with the assistance of the second-layer tubing module at the top, it enables the fixing and translation of the tubing. Each set of pallet 14, tray 15, lower support platform 16, and upper support platform 17 forms a lower workstation located below the tubing.

[0037] Only 10 sets of the pallet 14 and tray 15 are required. The workstation is pushed on the upper side of the loop chain. After the oil pipes of all workstations are removed, they can be retracted.

[0038] The outer end of the pin is also equipped with a support roller 11. A track platform 12 is provided on the inner end face of the strip-shaped vertical plate 6 of each workstation channel 5. The bottom circumference of the support roller 11 rests on the track platform 12, which supports the support roller 11, ensuring that each lower workstation moves smoothly laterally along the track platform 12 without sagging due to the flexible structure of the chain. The inner side of the support roller 11 has an outwardly extending flange structure 13 located inside the track platform 12 to limit the axial displacement of the support roller 11, ensuring the axial stability of the lower workstation when moving laterally along the track platform 12, and preventing lateral displacement or jamming of the workstation assembly. Based on the aforementioned structure of the support roller 11, high-precision lateral translation capability for supporting and positioning the oil pipe at the bottom is ensured, while also taking into account structural rigidity and high motion repeatability positioning accuracy under heavy load conditions.

[0039] In addition to the above description of chain drive structures, common chain drive structures such as limiting and tensioning can also be integrated and selected in this solution.

[0040] In terms of transmission, a drive shaft module is horizontally installed on all the drive sprockets 9, enabling independent control of a single row of lower workstations. The drive shaft module adopts an independent drive-changing mode, and its specific structure includes: an outer shaft 18, on which a rotating sleeve 19 is provided for each sprocket on the same side. The rotating sleeve 19 is a ring-shaped component coaxial with the outer shaft 18. The rotating sleeve 19 is rotatably connected to the outer shaft 18 through a bearing component. The outer circumferential surface of the rotating sleeve 19 is used to install and fix the drive sprocket 9, realizing the relative fixation between the rotating sleeve 19 and the drive sprocket 9.

[0041] The outer shaft 18 is a hollow shaft with an inner hole 20 extending through it along its axial direction. A mandrel 21 is centrally disposed within the inner hole 20. The mandrel 21 is used for axial movement. The two ends of the outer shaft 18 are rotatably mounted relative to the bottom frame 1 and the work station channel 5 through bearing components. The two are independent of each other.

[0042] The outer shaft 18 has a pin sleeve 22 that passes radially through the middle of each rotating sleeve 19. The pin sleeve 22 has a cylindrical pin 23 that slides radially relative to it along the outer shaft 18. The inner circumference of the rotating sleeve 19 has a groove 32 that matches the outer end of the cylindrical pin 23. There can be one or more grooves 32 (e.g., three or four). The inner end of the cylindrical pin 23 is located inside the outer shaft 18. The outer end of the cylindrical pin 23 passes through the pin sleeve 22 and is exposed between the outer shaft 18 and the inner circumference of the rotating sleeve 19. When the cylindrical pin 23 is retracted into the pin sleeve 22, the rotating sleeve 19 and the outer shaft 18 are independent of each other. When the cylindrical pin 23 is engaged in the groove 32, the rotating sleeve 19 is locked on the outer shaft 18 and rotates synchronously with it, thereby driving the corresponding sprocket to operate.

[0043] The length of the cylindrical pin 23 is longer than that of the pin sleeve 22. When the outer edge of the cam 24 contacts the inner end of the cylindrical pin 23, the outer end of the cylindrical pin 23 is inserted into the slot 32 of the rotating sleeve 19. The outer end of the cylindrical pin 23 is hemispherical, and the slot 32 is a spherical cap surface smaller than the hemispherical surface and adapted to the spherical surface of the outer end of the cylindrical pin 23. The edge of the slot 32 has an arc-shaped chamfer. This facilitates smooth pushback to the original position based on the tangential force of rotation during reset.

[0044] The outer circumferential surface of the mandrel 21 is provided with a plurality of cams 24 along the axial direction. The number of cams 24 corresponds one-to-one with the number of workstation slots 5. The outer edge of the cam 24 is adapted to the inner diameter of the inner hole 20, and can push the cylindrical pin 23 outward when it passes through, so that it is locked into the slot 32, thereby realizing the transmission of rotational action. The cam 24 is a drum-shaped structure with an arc arch in the middle. The cam 24 is coaxial with the mandrel 21. Both ends of the cam are provided with inclined surfaces, which can gradually push the cylindrical pin 23 outward so that it can smoothly enter the slot 32.

[0045] In this example, the distance difference between the cam 24 and the cylindrical pin 23 is 22.5 cm. That is, the distance between each adjacent cam 24 is different and increases sequentially, preferably with equal arithmetic increments. For example, if the distance between the first cam 24 and the first cylindrical pin 23 is d1, then the distance between the second cam 24 and the second cylindrical pin 23 is (d1 + 22.5), the distance between the third cam 24 and the third cylindrical pin 23 is (d1 + 22.5 + 22.5)... This ensures that when the mandrel 21 moves axially along the outer shaft 18, the corresponding cylindrical pin 23 is triggered radially along the mandrel 21. When one set of cams 24 and cylindrical pins 23 are in the same position, the other cams 24 and cylindrical pins 23 are necessarily misaligned, thus achieving precise selective driving of the designated workstation slot 5. This arithmetic cam 24 arrangement design makes the driving sequence of each workstation controllable and non-interfering. It enables a single drive shaft to selectively transmit driving force to a single-row chain.

[0046] During operation, the rotating sleeve 19 and the drive sprocket 9 support components such as the chain and the bottom of the oil pipe. When the cam 24 and the cylindrical pin 23 are misaligned, the outer end of the cylindrical pin does not extend beyond the pin sleeve 22, and the rotation of the outer shaft 18 does not drive the rotating sleeve 19. Figure 7 As shown, when the mandrel 21 moves to the left under the drive of the electric cylinder 28, the cam 24 pushes the cylindrical pin to the left, causing it to tend to push outward. As the outer shaft 18 rotates continuously, there will inevitably be a position within the 360-degree rotation range where the cylindrical pin 23 will insert into the slot 32, thereby realizing the rotation of the outer shaft 18 on the rotating sleeve 19. When the work station moves to the correct position, the mandrel 21 moves laterally, causing the cam 24 to disengage from the cylindrical pin. The cylindrical pin 23 is pushed out of the rotating sleeve 19 by the tangential force generated by the rotation of the outer shaft 18, thereby realizing the disengagement of the outer shaft 18 from the rotating sleeve 19.

[0047] In terms of power, the rotation of the outer shaft 18 is driven by a hydraulic motor, specifically including a hydraulic motor, a drive wheel 25, and a driven wheel 26. The driven wheel 26 and the drive wheel can be pulleys or sprockets. The driven wheel 26 is fixed to one end of the outer shaft 18. A transmission belt is wound between the drive wheel 25 and the driven wheel 26. The output shaft of the hydraulic motor is connected to the drive wheel 25 to output rotational power, thereby realizing the rotational drive of the loop chain in the channel 5 of a certain workstation.

[0048] The drive for the spindle 21 is achieved using an electric cylinder 28, specifically comprising: a connecting frame 27, an electric cylinder 28, a guide rod 29, and a sliding sleeve 30. One end of the spindle 21 is connected to an extension portion 31. The guide rod 29 passes through the sliding sleeve 30, and the two are slidably engaged. The sliding sleeve 30 is fixed relative to the bottom frame 1 or the outermost strip-shaped upright plate 6. The guide rod 29 is arranged parallel to the spindle 21. The piston rod end of the electric cylinder 28 is fixedly connected to the connecting frame 27. At the same time, one end of the guide rod 29 and the outer end of the extension shaft are both fixed on the connecting frame 27, so that the axial extension and retraction movement of the piston rod of the electric cylinder 28 is synchronously transmitted to the spindle 21 via the connecting frame 27. The guide rod 29 assists in guiding the spindle, ensuring the straightness of the axial movement of the spindle 21.

[0049] The above power structure can be arranged at both ends or at one end. If it is arranged at both ends, the translation direction of the spindle 21 is coordinated in the same direction, and the rotation drive of the outer shaft 18 is also coordinated in the same direction.

[0050] Based on the above improvements, this drilling rig pipe-laying module has the following significant technical advantages: First, it achieves compatibility with φ73, φ89, and φ114 tubing in production operations. The bottom of the tubing is supported by a “┐┌” shaped support structure in conjunction with a hollow tray 15 structure, which can adapt to the bottom profile of two specifications of tubing and facilitate the timely discharge of oily wastewater. Secondly, structural improvements were made to the roller chain to address the issue of heavy-duty roller chains sagging under gravity when spanning large distances. The support of the rollers 11 and the track 12 ensures that all lower workstations remain horizontal during lateral movement, preventing workstation settlement due to chain flexibility. The flange structure 13 acts as a "guide rail," limiting the axial displacement of the rollers 11. In situations requiring high-precision docking, such as when the robotic arm grasps oil pipes, this prevents lateral swaying or jamming during workstation movement, ensuring repeatability and positioning accuracy in automated operations. The triple guidance of the rollers 11, track 12, and flange ensures the straightness and repeatability of the heavy-duty chain during long-distance movement, meeting the high-precision requirements of automated robotic arm grasping.

[0051] Third, through the composite transmission of the spindle 21 and outer shaft 18, combined with the engagement and disengagement of the equally spaced cam 24 and the cylindrical pin 23, a unique selective drive mechanism is achieved: only a single drive shaft is needed to activate the chain library of any row of workstations as needed, significantly improving system response efficiency and energy utilization, and greatly simplifying the structural complexity and control logic hierarchy of the chain drive system. It should be noted that the above content is a further detailed description of the invention in conjunction with specific embodiments, and it should not be considered that the specific implementation of the invention is limited to these descriptions. For those skilled in the art, several simple improvements and modifications can be made without departing from the concept of the invention, and all such improvements and modifications should be considered within the scope of protection of the invention.

Claims

1. A pipe-driven storage system, characterized in that, The device includes a bottom frame with multiple workstation channels arranged linearly on it. Each workstation channel has a drive sprocket and a driven sprocket at both ends. A spiral chain, arranged along the length of each workstation channel, is installed within the channel. The spiral chain wraps around the drive and driven sprockets. A lower workstation, which mates with the bottom end of an oil pipe, is arranged on the spiral chain. An outer shaft is horizontally inserted through the center of all drive sprockets. The outer shaft is rotatably mounted relative to the workstation channels and is driven to rotate by a drive device. A rotating sleeve, fixed to the drive sprocket, is rotatably fitted onto the outer shaft at a position corresponding to the drive sprocket. A cylindrical pin, which slides radially along the outer shaft, is located on the side wall of the outer shaft at a position corresponding to the rotating sleeve. One or more slots are provided on the inner ring of the rotating sleeve to mate with the cylindrical pin. The cylindrical pin is inserted into the slot to make the rotating sleeve... The outer axis is circumferentially limited; the loop chain includes an outer chain plate, and each set of lower workstations includes a support plate, a tray, a lower support platform, and an upper support platform fixed sequentially from bottom to top. There are two support plates, each fixed to the outer chain plate on the same side. The projection range of the tray, lower support platform, and upper support platform decreases. The upper support platform, lower support platform, and tray are provided with a through-hole structure from top to bottom. The workstation channel includes two oppositely arranged and vertically set strip plates. The loop chain is set between the two strip plates. The inner end face of the strip plate is provided with a track platform. The loop chain includes an inner link, an outer link, and a pin. The outer end of the pin is provided with a support roller. The bottom circumferential surface of the support roller contacts and engages with the top surface of the track platform. The inner side of the support roller is provided with an outwardly extending flange structure. The flange structure is located on the inner side of the track platform.

2. The pipe-type storage tank according to claim 1, characterized in that, The drive device includes any one of a hydraulic motor, a pneumatic motor, an electric motor, and an internal combustion engine, and the drive device achieves transmission with the outer shaft through any one of belt drive, chain drive, and gear drive.

3. The pipe-type storage tank according to claim 1, characterized in that, The outer shaft is a hollow shaft with an inner hole extending through it along its axial direction. A mandrel, independent of the mandrel, is coaxially fitted inside the inner hole. The mandrel has a linear translational movement along its axial direction. The mandrel has cams of the same number as the rotating sleeves along its axis. The outer edge of the cam is close to the inner wall of the inner hole. A pin sleeve is provided on the outer shaft corresponding to the middle of each rotating sleeve, extending radially through it. The cylindrical pin is set inside the pin sleeve and slides with the pin sleeve radially along the rotating sleeve. When the outer edge of the cam contacts the inner end of the cylindrical pin, the outer end of the cylindrical pin is inserted into the groove of the rotating sleeve at that position. The spacing between adjacent cams is not equal.

4. The pipe-type storage tank according to claim 3, characterized in that, The spacing between adjacent cams increases by an equal increment.

5. A pipe-driven storage tank according to claim 3, characterized in that, One or both ends of the mandrel are provided with coaxial extensions. A connecting frame is fixed to the outer end of the extension. An electric cylinder and a sliding sleeve are provided on the outermost work station channel near the mandrel. A piston rod is telescopically fitted at one end of the electric cylinder. A guide rod is linearly slidably fitted inside the sliding sleeve. The guide rod and the piston rod are arranged parallel to each other relative to the mandrel. One end of the guide rod and the end of the piston rod are both fixed to the connecting frame.

6. The pipe-driven storage tank according to claim 1, characterized in that, The bottom frame is a rectangular frame structure. Angle steel with downward-facing inside corners is fixed at the four corners of the bottom frame. A positioning post is provided at the inside corner of the angle steel. A positioning pin is provided at the center of the top of the positioning post. The bottom end of the positioning post is welded and fixed to the drilling platform. The top of the angle steel is provided with a mounting hole for the positioning pin to pass through.

7. A drilling platform, characterized in that, The drilling rig is equipped with a pipe bank as described in any one of claims 1-6, and the bottom frame is fixedly connected or detachably fixedly connected to the top surface of the drilling rig.

8. An automated overhaul system, characterized in that, It includes a two-tiered working platform and a bottom drilling platform arranged opposite each other. The drilling platform is equipped with a pipe rack as described in any one of claims 1-6. The bottom frame is fixedly connected or detachably fixedly connected to the top surface of the drilling platform.

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