A downhole cable laying auxiliary pulley carriage

Abstract

This invention relates to the field of downhole cable laying equipment technology, and discloses an auxiliary pulley frame for downhole cable laying, including a wellhead fixed bracket and upper and lower auxiliary pulley mechanisms installed on the wellhead fixed bracket. The wellhead fixed bracket includes an annular frame and a support frame for supporting the annular frame above the wellhead. The support frame is fixed to the outer ring of the annular frame and extends away from the center of the wellhead. The upper auxiliary pulley mechanism includes multiple upper auxiliary pulley groups arranged in the inner ring of the annular frame. The lower auxiliary pulley mechanism includes a lower auxiliary pulley group located below the annular frame and a lower pulley bracket for fixing the lower auxiliary pulley group. The lower pulley bracket is fixed to the wellhead fixed bracket by a lifting mechanism. This invention avoids cable sheath wear by preventing the cable from contacting the upper and lower edges of the wellhead, and also achieves high laying efficiency and low manual labor intensity.

Description

Technical Field

[0001] This invention relates to the field of underground cable laying equipment technology, and in particular to an auxiliary pulley frame for underground cable laying. Background Technology

[0002] With the continuous development of pipeline engineering, underground cable laying is an important project. During the laying of underground cables, the cables will inevitably rub against the wellhead, which will accelerate the wear of the cables and even cause leakage, affecting the normal operation of the work or causing other accidents.

[0003] Utility model patent CN206195257U discloses a corner pulley for cable laying manholes, comprising two sector-shaped plates and several pulleys. The pulleys are evenly fixed to the curved sides of the two sector-shaped plates by bolts. Bolts are located near the centers of the two sector-shaped plates, and the two sector-shaped plates are mutually fixed by these bolts. The corner pulley for cable laying manholes designed by this utility model uses readily available and simple raw materials, is easy to manufacture, and is convenient to transport, move, and operate, saving significant construction time and costs, making it suitable for widespread application.

[0004] The device described in the aforementioned patent requires first setting up a frame at the wellhead, then suspending the corner pulley on the frame, and finally lowering the cable to be laid into the well through the corner pulley. Although the corner pulley can solve the problem of cable friction with the wellhead, setting up the frame is not only time-consuming and labor-intensive, but the corner pulley can only support the cable at the upper edge of the wellhead, but cannot support the cable that enters the well and turns laterally, so the cable can still wear against the lower edge of the wellhead. Summary of the Invention

[0005] The purpose of this invention is to provide an auxiliary pulley frame for laying underground cables, which ensures that the cables do not come into contact with the upper or lower edge of the wellhead. This prevents the cables from experiencing significant friction with the upper or lower edge of the wellhead during the cable laying process, thus avoiding wear on the cable sheath. The invention also offers good stability, good laying effect, and low manual labor intensity.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] An auxiliary pulley frame for downhole cable laying includes a wellhead fixing bracket and upper and lower auxiliary pulley mechanisms mounted on the wellhead fixing bracket. The wellhead fixing bracket includes an annular frame and a support frame for supporting the annular frame above the wellhead. The support frame is fixed to the outer ring of the annular frame and extends away from the center of the wellhead. The upper auxiliary pulley mechanism includes multiple upper auxiliary pulley groups arranged in the inner ring of the annular frame. The lower auxiliary pulley mechanism includes a lower auxiliary pulley group located below the annular frame and a lower auxiliary pulley bracket for fixing the lower auxiliary pulley group. The lower auxiliary pulley bracket is fixed to the wellhead fixing bracket by a lifting mechanism. The upper and lower auxiliary pulley groups are rotatable pulleys.

[0008] By adopting the above technical solution, the wellhead fixing bracket is supported above the wellhead using a support frame. Then, the cable to be laid passes sequentially through the upper auxiliary pulley group of the upper edge auxiliary pulley mechanism and the lower auxiliary pulley group of the lower edge auxiliary pulley mechanism of the wellhead. Then, based on the height difference between the upper and lower edges of the wellhead, the lower auxiliary pulley group of the lower edge auxiliary pulley mechanism of the wellhead is adjusted to a position matching the lower edge of the wellhead using a lifting mechanism. This ensures that the cable does not come into contact with the upper or lower edge of the wellhead, thereby preventing significant friction between the cable and the upper or lower edge of the wellhead during cable laying and thus avoiding wear on the cable sheath.

[0009] A further feature of the present invention is that the auxiliary pulley mechanism along the wellhead also includes a guide wheel, which is rotatably connected to a guide wheel mounting bracket. The guide wheel is located on one side above the annular frame and also includes a rotating adjustment ring. The rotating adjustment ring is located on the outer ring of the annular frame and is coaxial with the annular frame. The outer ring of the annular frame is provided with an annular groove. The inner ring of the rotating adjustment ring is rotatably connected to the annular groove. The surface of the annular frame is provided with a through hole I that penetrates the annular groove at a position opposite to the middle of each set of pulleys. The rotating adjustment ring is provided with a through hole II that matches the position of the through hole I. The inner wall of the through hole I is provided with a thread, and the through hole I is threadedly connected to a fixing bolt.

[0010] By adopting the above technical solution, the guide wheel is used to guide and support the cable passing through the upper auxiliary pulley group of the auxiliary pulley mechanism above the wellhead, so that the cable will not sway left and right when dragged during the laying process, effectively ensuring the stability of the cable laying. At the same time, it also effectively ensures the stability of the wellhead fixed support, greatly improving the efficiency of cable laying and the service life of the device. By rotating the rotating adjustment ring and connecting the through hole one on the annular frame to the different through holes two on the rotating adjustment ring with the fixing bolt, the different angles of the rotating adjustment ring can be adjusted. This allows the guide wheel mounting bracket fixed on the rotating adjustment ring to rotate synchronously with the rotating adjustment ring, so that the guide wheel mounted on the guide wheel mounting bracket rotates synchronously with the rotating adjustment ring. This makes the guide wheel face different upper auxiliary pulley groups on the annular frame, thereby achieving the guidance and support of cables in different directions. There is no need for manual adjustment of the frame or cable direction, which greatly reduces the labor intensity of people.

[0011] A further configuration of the present invention is as follows: the lifting mechanism includes two cable coils and a cable wound around the two cable coils. Both cable coils are connected to the lifting drive unit. One end of the cable is fixed to one cable coil and wound around several times. Then, it passes through the wellhead fixing bracket and the transition support wheel on the lower edge pulley bracket in sequence and is fixed to the other cable coil and wound around several times. The lower edge pulley bracket hangs down naturally to the center of the wellhead and the cable is in a taut state.

[0012] By adopting the above technical solution, when the lifting drive unit drives the two cable coils to rotate, the two cable coils simultaneously wind or release the cable, thereby causing the lower edge pulley bracket located at the center of the wellhead to rise or fall longitudinally along the center of the wellhead. This causes the lower auxiliary pulley group located on the lower edge pulley bracket to rise or fall, ensuring that the lower auxiliary pulley group is adjusted to the height of the lower edge of the wellhead during cable laying. This solves the problem of cable contact with the lower edge of the wellhead. Using cables for height adjustment is not only simple in structure and easy to retract, but also low in cost and light in weight.

[0013] A further embodiment of the present invention is that the lifting mechanism further includes a support plate for supporting the two cable coils, the bottom of the support plate being fixed to the upper end of the rotating adjustment ring by a plurality of support columns of equal length, and the guide wheel mounting bracket being fixed to the support column on one side above the rotating adjustment ring.

[0014] By adopting the above technical solution, the support plate is fixed to the upper end of the rotating adjustment ring, so that the lifting mechanism can rotate and adjust synchronously with the rotating adjustment ring. This allows the lower auxiliary pulley group of the auxiliary pulley mechanism at the lower edge of the wellhead installed on the lifting mechanism to rotate and adjust synchronously with the adjustment ring, thus ensuring that the lower auxiliary pulley group is always opposite to the upper auxiliary pulley group opposite to the guide wheel. This enables the lower auxiliary pulley group to guide and support cables in different directions synchronously with the guide wheel, eliminating the need for manual adjustment of the frame or cable direction and further reducing the labor intensity of personnel.

[0015] A further configuration of the present invention is as follows: the lifting drive unit includes a lifting motor, the lifting motor is fixed to the bottom of the support plate, the output shaft of the lifting motor is fixedly connected to one end of the rotating shaft, the other end of the rotating shaft is fixedly connected to the drive turntable, the drive turntable has a plurality of pin holes on its circumference coinciding with its center, and the top of the uppermost cable coil has a plurality of mating holes one corresponding to the pin holes, the pin holes and the mating holes one are connected by connecting pins.

[0016] By adopting the above technical solution, when it is necessary to adjust the height of the lower auxiliary pulley group in the auxiliary pulley mechanism at the bottom of the wellhead, the lifting motor is started, the lifting motor drives the rotating shaft to rotate, and the rotating shaft drives the drive turntable fixedly connected to it to rotate. Since the mating hole at the top of the uppermost cable coil is connected to the pin hole on the drive turntable through the connecting pin, when the drive turntable rotates, it will drive the two cable coils to rotate simultaneously. When the two cable coils rotate simultaneously, the two cable coils wind or release the cable at the same time, thereby causing the lower auxiliary pulley group installed on the cable to rise or fall, thus realizing the height adjustment process of the lower auxiliary pulley group.

[0017] A further feature of the present invention is that a second support plate is provided above the drive turntable for supporting the cable coil to be laid. The second support plate has a positioning platform at its center, the diameter of which matches the center hole of the cable coil, and the upper end of the positioning platform is conical.

[0018] By adopting the above technical solution, the second support plate is used to support the cable coil. The positioning platform on the second support plate matches the center hole of the cable coil to achieve positioning of the cable coil, ensuring the stability of the cable coil position and preventing the cable coil from moving arbitrarily when the cable is released or dragged during cable laying. The upper end of the positioning platform is set as a cone shape, which makes it more convenient to assemble the cable coil with the positioning platform.

[0019] A further feature of the present invention is that: the bottom of the second support plate is provided with a boss that matches the center hole of the drive turntable, the boss is rotatably connected to the center hole of the drive turntable, the bottom of the second support plate is provided with a plurality of roller supports of equal height, the upper end of each roller support is fixed to the bottom of the second support plate, and the lower end of each roller support is provided with a roller, which is supported on the drive turntable.

[0020] By adopting the above technical solution, when the second support plate rotates with the drive turntable, it will drive the cable coil to rotate synchronously. When the cable coil rotates, it will automatically release the cable, thereby meeting the cable laying requirements. There is no need for manual pulling and dragging, which effectively saves labor intensity. The roller support at the bottom of the second support plate is used to support the second support plate, so that the weight of the second support plate and the cable coil supported on the second support plate can be evenly distributed on the roller support and roller, thereby avoiding the problem of excessive rotational drive load of the second support plate and the drive turntable caused by concentrated weight. In addition, the roller setting can also assist the second support plate to rotate relative to the first support plate, avoiding direct friction between the roller support and the first support plate, which would cause wear on the top of the first support plate.

[0021] A further feature of the present invention is that the bottom of the support plate 2 is provided with a plurality of mating holes 2 opposite to the pin holes, the mating holes 2 are blind holes, and an electromagnet is provided at the top of the mating holes 2. The electromagnet and the lifting motor are both electrically connected to the controller.

[0022] By adopting the above technical solution, when the controller energizes the electromagnet, the connecting pin enters the mating hole two under the magnetic force of the electromagnet. At this time, the connecting pin separates from the mating hole one, and only the support plate two is synchronously connected to the drive turntable. When the lifting motor rotates and drives the drive turntable to rotate, only the support plate two rotates synchronously with the drive turntable, while the support plate one does not rotate with the drive turntable. When the controller de-energizes the electromagnet, the connecting pin falls into the mating hole one under its own gravity. At this time, the connecting pin separates from the mating hole two, and only the support plate one is synchronously connected to the drive turntable. Therefore, before cable laying, only the support plate one is controlled to rotate with the drive turntable. Thus, the rotation of the lifting motor can only drive the auxiliary pulley at the lower edge of the wellhead installed on the lifting mechanism. The lower auxiliary pulley block of the mechanism moves up and down to adjust its position. During cable laying, only the second support plate rotates with the drive turntable. Therefore, the rotation of the lifting motor can only drive the second support plate to rotate, while the lower auxiliary pulley block of the manhole lower edge auxiliary pulley mechanism installed on the lifting mechanism will not move up and down. This ensures the stability of the distance between the cable and the upper and lower edges of the manhole during cable laying, effectively avoiding the risk of collision and friction between the cable and the lower edge of the manhole. The controller controls the electromagnet to be energized and de-energized to switch between the two different working modes of lower auxiliary pulley block position adjustment and cable rotation release. The working process is not only simple but also highly efficient, effectively reducing equipment costs.

[0023] The beneficial effects of this invention are:

[0024] 1. This invention utilizes a support frame to support the wellhead fixing bracket above the wellhead. Then, the cable to be laid passes sequentially through the upper auxiliary pulley group of the upper edge auxiliary pulley mechanism and the lower auxiliary pulley group of the lower edge auxiliary pulley mechanism of the wellhead. Based on the height difference between the upper and lower edges of the wellhead, a lifting mechanism is used to adjust the lower auxiliary pulley group of the lower edge auxiliary pulley mechanism to a position matching the lower edge of the wellhead, ensuring that the cable does not come into contact with the upper or lower edge of the wellhead. This guarantees that during cable laying, when the cable is dragged, there will be no significant friction between the cable and the upper or lower edge of the wellhead, thus preventing wear on the cable sheath.

[0025] 2. The guide wheel of this invention guides and supports the cable passing through the upper auxiliary pulley group of the auxiliary pulley mechanism along the wellhead, preventing the cable from swaying left and right when dragged during laying, effectively ensuring the stability of the cable laying. Simultaneously, it also effectively ensures the stability of the wellhead fixing bracket, greatly improving the efficiency of cable laying and the service life of the device. By rotating the adjusting ring and connecting the through hole one on the annular frame to different through holes two on the adjusting ring with the fixing bolts, the adjusting ring can be adjusted to different angles. This allows the guide wheel mounting bracket fixed on the adjusting ring to rotate synchronously with the adjusting ring, and the guide wheel mounted on the guide wheel mounting bracket to rotate synchronously with the adjusting ring. This aligns the guide wheel with different upper auxiliary pulley groups on the annular frame, thus guiding and supporting cables in different directions. No manual adjustment of the frame or cable direction is required, greatly reducing labor intensity.

[0026] 3. In this invention, the lifting mechanism uses a lifting drive unit to drive two cable coils to rotate, so that the two cable coils simultaneously wind or release the cable, thereby causing the lower edge pulley bracket located at the center of the wellhead to rise or fall longitudinally along the center of the wellhead. This causes the lower auxiliary pulley group located on the lower edge pulley bracket to rise or fall, ensuring that the lower auxiliary pulley group is adjusted to the height of the lower edge of the wellhead during cable laying. This solves the problem of cable contact with the lower edge of the wellhead. Using cables for height adjustment is not only simple in structure and easy to retract, but also low in cost and light in weight.

[0027] 4. In this invention, a support plate is fixed to the upper end of the rotating adjustment ring, so that the lifting mechanism can rotate and adjust synchronously with the rotating adjustment ring. This allows the lower auxiliary pulley group of the auxiliary pulley mechanism at the lower edge of the wellhead installed on the lifting mechanism to rotate and adjust synchronously with the adjustment ring, thereby ensuring that the lower auxiliary pulley group is always opposite to the upper auxiliary pulley group opposite to the guide wheel. This enables the lower auxiliary pulley group to guide and support cables in different directions synchronously with the guide wheel, eliminating the need for manual adjustment of the frame or cable direction and further reducing the labor intensity of personnel.

[0028] 5. This invention uses a controller to control the electromagnet to energize and de-energize, thereby switching between two different working modes: position adjustment of the lower auxiliary pulley block and cable rotation release. This not only simplifies the working process but also increases efficiency and effectively reduces equipment costs. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the state of an auxiliary pulley frame for underground cable laying during cable laying according to the present invention.

[0031] Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0032] Figure 3 This is a cross-sectional structural diagram of an auxiliary pulley frame for laying underground cables according to the present invention.

[0033] Figure 4 yes Figure 1 A schematic diagram of the cross-sectional structure along direction B.

[0034] Figure 5 This is a schematic diagram of the auxiliary pulley mechanism at the upper edge of the wellhead and the auxiliary pulley mechanism at the lower edge of the wellhead in an auxiliary pulley frame for laying underground cables according to the present invention.

[0035] Figure 6 yes Figure 3 A magnified view of part C in the diagram.

[0036] In the diagram, 1. Wellhead fixing bracket; 101. Annular frame; 102. Support frame; 103. Annular groove; 104. Through hole one; 105. Fixing bolt; 2. Auxiliary pulley mechanism at the upper edge of the wellhead; 201. Upper auxiliary pulley block; 202. Guide wheel; 203. Guide wheel mounting bracket; 204. Rotating adjustment ring; 205. Through hole two; 3. Auxiliary pulley mechanism at the lower edge of the wellhead; 301. Lower auxiliary pulley block; 302. Lower edge pulley bracket; 303. Transition support 4. Wheel; 5. Wellhead; 6. Lifting mechanism; 7. Cable coil; 8. Cable; 9. Support plate one; 10. Support column; 11. Lifting drive unit; 12. Lifting motor; 13. Rotary shaft; 14. Drive turntable; 15. Pin hole; 16. Mating hole one; 17. Connecting pin; 18. Cable coil; 19. Support plate two; 20. Positioning platform; 10. Boss; 11. Roller support column; 12. Roller; 13. Mating hole two; 14. Electromagnet. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] like Figures 1-6As shown, an auxiliary pulley frame for laying downhole cables includes a wellhead fixing bracket 1 and an upper edge auxiliary pulley mechanism 2 and a lower edge auxiliary pulley mechanism 3 mounted on the wellhead fixing bracket 1. The wellhead fixing bracket 1 includes an annular frame 101 and a support frame 102 for supporting the annular frame 101 above the wellhead 4. The support frame 102 is fixed to the outer ring of the annular frame 101 and extends away from the center of the wellhead 4. The upper edge auxiliary pulley mechanism 2 includes a plurality of upper auxiliary pulley groups 201 arranged in the inner ring of the annular frame 101. The lower edge auxiliary pulley mechanism 3 includes a lower auxiliary pulley group 301 located below the annular frame 101 and a lower edge pulley bracket 302 for fixing the lower auxiliary pulley group 301. The lower edge pulley bracket 302 is fixed to the wellhead fixing bracket 1 by a lifting mechanism 5. The upper auxiliary pulley group 201 and the lower auxiliary pulley group 301 are rotatable pulleys.

[0039] Furthermore, the auxiliary pulley mechanism 2 above the wellhead also includes a guide wheel 202, which is rotatably connected to the guide wheel mounting bracket 203. The guide wheel 202 is located on one side above the annular frame 101. It also includes a rotating adjustment ring 204, which is located on the outer ring of the annular frame 101 and is coaxial with the annular frame 101. The outer ring of the annular frame 101 is provided with an annular groove 103. The inner ring of the rotating adjustment ring 204 is rotatably connected to the annular groove 103. The surface of the annular frame 101 is provided with a through hole 104 at a position opposite to the middle of each group of pulleys, which penetrates the annular groove 103. The rotating adjustment ring 204 is provided with a through hole 205 that matches the position of the through hole 104. The inner wall of the through hole 104 is provided with a thread, and the through hole 104 is threadedly connected to the fixing bolt 105.

[0040] Furthermore, the lifting mechanism 5 includes two cable coils 501 and a cable 502 wound around the two cable coils 501. Both cable coils 501 are connected to the lifting drive unit 6. One end of the cable 502 is fixed to one cable coil 501 and wound around several times. Then, it passes through the wellhead fixing bracket 1 and the transition support wheel 303 on the lower edge pulley bracket 302 in sequence and is fixed to the other cable coil 501 and wound around several times. The lower edge pulley bracket 302 hangs down naturally to the center of the wellhead and the cable 502 is in a taut state.

[0041] Furthermore, the lifting mechanism 5 also includes a support plate 503 for supporting the two cable coils 501. The bottom of the support plate 503 is fixed to the upper end of the rotating adjustment ring 204 by a plurality of support columns 504 of equal length. The guide wheel mounting bracket 203 is fixed on the support column 504 on one side above the rotating adjustment ring 204.

[0042] Furthermore, the lifting drive unit 6 includes a lifting motor 601, which is fixed to the bottom of the support plate 503. The output shaft of the lifting motor 601 is fixedly connected to one end of the rotating shaft 602, and the other end of the rotating shaft 602 is fixedly connected to the drive turntable 603. The drive turntable 603 has a plurality of pin holes 604 on its circumference that coincides with its center. The top of the uppermost cable coil 501 has a plurality of mating holes 605 that are opposite to the pin holes 604. The pin holes 604 and the mating holes 605 are connected by a connecting pin 606.

[0043] Furthermore, a support plate 2 8 is provided above the drive turntable 603 to support the cable coil 7 to be laid. The support plate 2 8 has a positioning platform 9 at its center. The diameter of the positioning platform 9 matches the center hole of the cable coil 7. The upper end of the positioning platform 9 is conical.

[0044] Furthermore, the bottom of the second support plate 8 is provided with a boss 11 that matches the center hole of the drive turntable 603. The boss 11 is rotatably connected to the center hole of the drive turntable 603. The bottom of the second support plate 8 is provided with a plurality of roller supports 12 of equal height. The upper end of each roller support 12 is fixed to the bottom of the second support plate 8, and the lower end of each roller support 12 is provided with a roller 13, which is supported on the drive turntable 603.

[0045] Furthermore, the bottom of the support plate 2 8 is provided with a plurality of mating holes 2 14 opposite to the position of the pin hole 604. The mating holes 2 14 are blind holes. The top of the mating holes 2 14 is provided with an electromagnet 15. The electromagnet 15 and the lifting motor 601 are both electrically connected to the controller.

[0046] The working principle of this invention is as follows: First, the wellhead fixing bracket 1 is supported above the wellhead by the support frame 102. Then, the cable coil 7 to be laid is placed above the second support plate 8, so that the center hole of the cable coil 7 mates with the positioning platform 9 of the second support plate 8. Then, the electromagnet 15 is kept de-energized by the controller. At this time, the connecting pin 606 falls into the mating hole 605 under its own weight. At this time, the connecting pin 606 separates from the mating hole 14, and only the first support plate 503 is synchronously connected to the drive turntable 603. Then, the lifting is controlled according to the height difference between the upper edge and the lower edge of the wellhead. When motor 601 starts, it drives shaft 602 to rotate. The rotation of shaft 602 causes drive turntable 603, which is fixedly connected to it, to rotate. Since the mating hole at the top of the uppermost cable coil 501 is connected to the pin hole 604 on drive turntable 603 via connecting pin 606, the rotation of drive turntable 603 causes both cable coils 501 to rotate simultaneously. When both cable coils 501 rotate simultaneously, they either wind or unwind the cable 502 at the same time, causing the lower auxiliary pulley assembly 301 mounted on the cable 502 to rise. Alternatively, the height can be lowered until the lower auxiliary pulley block 301 reaches a position matching the lower edge of the wellhead, ensuring that the cable does not come into contact with the upper or lower edge of the wellhead during cable laying. This prevents excessive friction between the cable and the upper or lower edge of the wellhead during cable laying, thus avoiding wear on the cable sheath. Then, the cable to be laid is passed sequentially through the upper auxiliary pulley block 201 of the upper edge auxiliary pulley mechanism 2 and the lower auxiliary pulley block 301 of the lower edge auxiliary pulley mechanism 3. Finally, the controller energizes the electromagnet 15, causing the connecting pin 60 to... 6. Under the magnetic force of electromagnet 15, it enters the mating hole 2 14. At this time, the connecting pin 606 separates from the mating hole 1 605, and only the support plate 2 8 is synchronously connected to the drive turntable 603. Then, the lifting motor 601 is started again, and the lifting motor 601 drives the drive turntable 603 to start rotating. At this time, only the support plate 2 8 rotates with the drive turntable 603. When the support plate 2 8 rotates with the drive turntable 603, it will drive the cable coil 7 to rotate synchronously. When the cable coil 7 rotates, it automatically releases the cable, thereby meeting the cable laying requirements without manual pulling or dragging, effectively saving labor intensity.

Claims

1. An auxiliary pulley frame for laying underground cables, characterized in that: The wellhead includes a wellhead fixing bracket (1) and an upper edge auxiliary pulley mechanism (2) and a lower edge auxiliary pulley mechanism (3) mounted on the wellhead fixing bracket (1). The wellhead fixing bracket (1) includes an annular frame (101) and a support frame (102) for supporting the annular frame (101) above the wellhead (4). The support frame (102) is fixed to the outer ring of the annular frame (101) and extends away from the center of the wellhead (4). The upper edge auxiliary pulley mechanism (2) includes a wellhead fixing bracket (1) and a support frame (102) for supporting the annular frame (101) above the wellhead (4). Multiple upper auxiliary pulley groups (201) on the inner ring of the annular frame (101), the wellhead lower edge auxiliary pulley mechanism (3) includes a lower auxiliary pulley group (301) located below the annular frame (101) and a lower edge pulley bracket (302) for fixing the lower auxiliary pulley group (301). The lower edge pulley bracket (302) is fixed on the wellhead fixed bracket (1) by a lifting mechanism (5). The upper auxiliary pulley group (201) and the lower auxiliary pulley group (301) are rotatable pulleys. The wellhead upper edge auxiliary pulley mechanism (2) also includes a guide wheel (202), which is rotatably connected to the guide wheel mounting bracket (203). The guide wheel (202) is located on one side above the annular frame (101). It also includes a rotating adjustment ring (204), which is located on the outer ring of the annular frame (101) and is coaxial with the annular frame (101). The outer ring of the annular frame (101) is provided with an annular groove (103). The inner ring of the rotating adjustment ring (204) is rotatably connected to the annular groove (103). The surface of the annular frame (101) and the position opposite to the middle of each set of pulleys are provided with a through hole (104) that penetrates the annular groove (103). The rotating adjustment ring (204) is provided with a through hole (205) that matches the position of the through hole (104). The inner wall of the through hole (104) is provided with a thread. The through hole (104) is threadedly connected to the fixing bolt (105). The lifting mechanism (5) includes two cable coils (501) and a cable (502) wound around the two cable coils (501). Both cable coils (501) are connected to the lifting drive unit (6). One end of the cable (502) is fixed to one cable coil (501) and wound around several times. Then it passes through the wellhead fixing bracket (1) and the transition support wheel (303) on the lower edge pulley bracket (302) in sequence and is fixed to the other cable coil (501) and wound around several times. The lower edge pulley bracket (302) hangs down naturally to the center of the wellhead and the cable (502) is in a taut state. The lifting mechanism (5) also includes a support plate (503) for supporting the two cable coils (501). The bottom of the support plate (503) is fixed to the upper end of the rotating adjustment ring (204) by a plurality of support columns (504) of equal length. The guide wheel mounting bracket (203) is fixed on the support column (504) on one side above the rotating adjustment ring (204).

2. The auxiliary pulley frame for laying underground cables according to claim 1, characterized in that: The lifting drive unit (6) includes a lifting motor (601), which is fixed to the bottom of the support plate (503). The output shaft of the lifting motor (601) is fixedly connected to one end of the rotating shaft (602), and the other end of the rotating shaft (602) is fixedly connected to the drive turntable (603). The drive turntable (603) has multiple pin holes (604) on its circumference that coincides with its center. The top of the uppermost cable coil (501) has multiple mating holes (605) that are opposite to the pin holes (604). The pin holes (604) and the mating holes (605) are connected by connecting pins (606).

3. The auxiliary pulley frame for laying underground cables according to claim 2, characterized in that: Above the drive turntable (603) is a second support plate (8) for supporting the cable coil (7) to be laid. The second support plate (8) has a positioning platform (9) at its center. The diameter of the positioning platform (9) matches the center hole of the cable coil (7). The upper end of the positioning platform (9) is conical.

4. The auxiliary pulley frame for laying underground cables according to claim 3, characterized in that: The bottom of the second support plate (8) is provided with a boss (11) that matches the center hole of the drive turntable (603). The boss (11) is rotatably connected to the center hole of the drive turntable (603). The bottom of the second support plate (8) is provided with multiple roller supports (12) of equal height. The upper end of each roller support (12) is fixed to the bottom of the second support plate (8). The lower end of each roller support (12) is equipped with a roller (13). The roller (13) is supported on the drive turntable (603).

5. The auxiliary pulley frame for laying underground cables according to claim 3, characterized in that: The bottom of the support plate 2 (8) is provided with multiple mating holes 2 (14) opposite to the pin hole (604). The mating holes 2 (14) are blind holes. The top of the mating holes 2 (14) is provided with an electromagnet (15). The electromagnet (15) and the lifting motor (601) are both electrically connected to the controller.

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