Cable unwinding device and unwinding method for laying submarine cable

Abstract

The present invention relates to the field of cable unwinding technology, and specifically to a cable unwinding device and an unwinding method for laying submarine cables, including a winding drum with a submarine cable wound thereon and a bracket for receiving the winding drum; a blocking plate is hinged on the bracket, and the blocking plate is an arc-shaped structure. The blocking plate can rotate around the hinge between itself and the bracket and contact the submarine cable wound on the outermost side of the winding drum. The blocking plate presses the submarine cable wound on the outermost side of the winding drum and the pressure is stable within the rated threshold. When the winding drum rotates to release the submarine cable, the blocking plate always contacts the submarine cable located on the outermost side of the winding drum. The present invention can not only ensure that the submarine cable will not directly hit the blocking plate, but also enable the blocking plate to always firmly press the submarine cable on the winding drum, thereby ensuring the safety of the surrounding workers.

Description

Technical Field

[0001] The present invention relates to the technical field of cable unwinding, and in particular to a cable unwinding device and an unwinding method for laying a submarine cable. Background Art

[0002] Chinese patent CN209777787U discloses a steel strip unwinding mechanism, which includes a base and an unwinding assembly for supporting the steel strip coil, and the unwinding assembly includes an arc-shaped support plate and a plurality of front and rear baffles provided with the arc-shaped support plate. The steel strip material tray can be stopped and released by freely and quickly switching the four front baffles between the horizontal and vertical states. The above utility model patent provides a limiting structure that can quickly position the steel strip material tray, but the front baffle is relatively complicated to manufacture, which increases the production cost; and the stability is not strong when unwinding at high speed.

[0003] Chinese patent CN221295661U discloses an unwinding device for cable tray production, including an unwinding machine body, a main shaft extending from one side of the unwinding machine body, a ring sleeved on the main shaft, a plurality of support plates hinged along the circumference of the ring for placing raw materials, and also including a lead screw and a tight sleeve matching the lead screw; wherein the ring includes a movable ring and a fixed ring, the fixed ring is arranged on the side of the main shaft away from the unwinding machine body and has a positioning hole in the center, the movable ring moves along the extension direction of the main shaft length, and when the movable ring is moved, the support plate is driven to move closer to or away from the main shaft; the lead screw extends from the inside of the main shaft through the positioning hole and is fixed by the tight sleeve at the end away from the unwinding machine; baffles are provided at both ends of the support plate, wherein the baffle away from the side of the unwinding machine body is a movable baffle.

[0004] Although the above scheme can improve the stability of unwinding, it cannot adapt to the installation of heavy-weight submarine cables. Even if the heavy-weight submarine cable is installed in the above device, due to the large diameter of the submarine cable and the fact that the ship is mostly in a state of ups and downs with the waves when laying the submarine cable, there is a clearance in the submarine cable when it is unwinding, which leads to the loosening of the wound submarine cable. When the submarine cable is loose, the submarine cable continues to be in the unwinding state, so it is easy for the submarine cable to be thrown out of the winding drum. If there are staff passing by, it is easy for the staff to be knocked down or injured by the submarine cable, causing serious safety accidents. In the prior art, a blocking plate is usually arranged on one side of the winding drum, but the blocking position is in a stationary state relative to the winding drum. As the submarine cable is continuously released, the distance between the submarine cable wound on the winding drum and the blocking plate becomes larger and larger. In this way, when the submarine cable is thrown out, the submarine cable will directly hit the blocking plate, so the strength requirements of the blocking plate are relatively high, and the thrown submarine cable is also easily damaged when it hits the blocking plate. Summary of the invention

[0005] In view of the above problems, a cable unwinding device and an unwinding method for laying submarine cables are provided, wherein a winding drum with a submarine cable wound thereon is placed on a bracket, and a first driving device drives a traction drum to reel in a traction rope, and the traction rope drives a blocking plate to approach the submarine cable wound on the winding drum. After the blocking plate contacts the submarine cable, a torque sensor located between the first driving device and the torque sensor monitors the torque when the traction drum reels in the traction rope, and a rated torque threshold is preset in the torque sensor. When the torque monitored by the torque sensor is less than the rated torque threshold, the first driving device drives the traction drum to continue reeling, and when the torque monitored by the torque sensor is greater than the rated torque threshold, the first driving device stops running, and the blocking plate is stopped. When the plate presses the submarine cable, the limiting unit arranged on one side of the blocking plate can limit the one-way rotation of the blocking plate rotating toward the winding drum. After the submarine cable is completely released, the exhaust unit arranged on the ventilation unit is started, and the exhaust unit extracts the air in the accommodating chamber in the ventilation unit, so that the blocking plate rotates toward the side away from the winding drum. Then the winding drum is removed from the bracket and a new winding drum is installed. When the submarine cable is thrown out from the winding drum, the blocking plate is always in contact with the submarine cable, and the submarine cable can be pressed by the blocking plate when it is thrown out. This can not only ensure that the submarine cable will not directly hit the blocking plate, but also enable the blocking plate to always press the submarine cable firmly on the winding drum, thereby ensuring the safety of the surrounding staff.

[0006] In order to solve the problems of the prior art, the present invention provides a cable unwinding device, comprising a winding drum with a submarine cable wound thereon and a bracket for supporting the winding drum; a blocking plate is hinged on the bracket, and the blocking plate is an arc-shaped structure. The blocking plate can rotate around the hinge between itself and the bracket and contact with the submarine cable wound on the outermost side of the winding drum, and the blocking plate presses the submarine cable wound on the outermost side of the winding drum and the pressure is stabilized within the rated threshold value. When the winding drum rotates to release the submarine cable, the blocking plate is always in contact with the submarine cable located at the outermost side of the winding drum.

[0007] Preferably, a driving unit for driving the blocking plate to rotate is provided on one side of the blocking plate, the driving unit includes a traction rope and a first driving device, one end of the traction rope is fixedly provided on the blocking plate, the first driving device is provided on the other end of the traction rope, and when the first driving device is started, the traction rope is reeled up by the first driving device.

[0008] Preferably, a traction disk is fixedly provided on the driving end of the first driving device, and one end of the traction rope away from the blocking plate is wound around the traction disk. A torque sensor is provided between the first driving device and the traction disk, and the torque sensor is preset with a rated torque threshold. When the torque detected by the torque sensor is less than the rated torque threshold, the traction disk reels the traction rope; when the torque detected by the torque sensor is greater than the rated torque threshold, the traction disk stops reeling in the traction rope.

[0009] Preferably, a limiting unit is provided on one side of the blocking plate, the limiting unit includes a ventilation unit connected to the blocking plate, a accommodating cavity is contained in the ventilation unit, a one-way valve which can communicate with the accommodating cavity is provided on the ventilation unit, the one-way valve can allow outside air to flow into the accommodating cavity, when the blocking plate rotates toward one side of the winding reel, outside air flows into the accommodating cavity through the one-way valve.

[0010] Preferably, an exhaust unit for extracting the gas in the accommodating chamber is also provided on the ventilation unit, and the exhaust unit is connected to the accommodating chamber. When the exhaust unit extracts the air in the accommodating chamber, the blocking plate rotates in a direction away from the winding reel.

[0011] Preferably, the driving unit includes a driving pump, which is arranged at the end of the traction disk. When the driving end of the driving pump rotates, it can drive the traction disk to rotate. The driving pump is driven by flowing hydraulic oil. When the hydraulic oil flows from the input end to the output end of the driving pump, the driving end of the driving pump rotates forward. When the hydraulic oil flows from the output end to the input end of the driving pump, the driving end of the driving pump rotates reversely.

[0012] Preferably, a support shaft for supporting the winding drum is horizontally arranged on the bracket, and a support unit is arranged below the support shaft, the support unit includes a first roller that can be lifted and lowered in the vertical direction, the winding drum is installed in front of the support shaft, the first roller descends to the lowest position, and after the winding drum is installed, the first roller rises and stops moving after contacting the submarine cable on the winding drum.

[0013] Preferably, a mounting bracket is slidably provided at one end of the support shaft away from the bracket along the axial direction of the support shaft, and a second driving device is provided on the mounting bracket. When the end face of the mounting bracket facing the support shaft is coplanar with the end of the support shaft, the second driving device can drive the winding drum to rotate.

[0014] Preferably, a plurality of second rollers are rotatably arranged on the side of the blocking plate facing the submarine cable, the second rollers are evenly arranged along the arc-shaped extension direction of the blocking plate, the axis of the second rollers is parallel to the axis of the winding reel arranged on the bracket, and the blocking plate contacts the submarine cable through the second rollers.

[0015] The present invention also provides a reeling method for laying a submarine cable, using a cable reeling device, and the specific steps are as follows:

[0016] S1. Place a winding drum with a submarine cable wound on a bracket, and a first driving device drives the traction drum to reel in a traction rope, and the traction rope drives a blocking plate to approach the submarine cable wound on the winding drum.

[0017] S2. After the blocking plate contacts the submarine cable, the torque sensor located between the first drive device and the torque sensor monitors the torque when the traction drum reels the traction rope. The torque sensor is preset with a rated torque threshold. When the torque monitored by the torque sensor is less than the rated torque threshold, the first drive device drives the traction drum to continue reeling. When the torque monitored by the torque sensor is greater than the rated torque threshold, the first drive device stops running. When the blocking plate presses the submarine cable, the limit unit arranged on one side of the blocking plate can limit the unidirectional rotation of the blocking plate rotating toward the winding drum.

[0018] S3. After the submarine cable is completely released, the exhaust unit installed on the ventilation unit is started, and the exhaust unit extracts the air in the accommodating cavity of the ventilation unit, so that the blocking plate rotates toward the side away from the winding drum, and then the winding drum is removed from the bracket and a new winding drum is installed.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention places a winding drum with a submarine cable wound on a bracket, and a first driving device drives the traction drum to reel in the traction rope, and the traction rope drives the blocking plate to approach the submarine cable wound on the winding drum. After the blocking plate contacts the submarine cable, a torque sensor located between the first driving device and the torque sensor monitors the torque when the traction drum reels in the traction rope. The torque sensor is preset with a rated torque threshold. When the torque monitored by the torque sensor is less than the rated torque threshold, the first driving device drives the traction drum to continue reeling. When the torque monitored by the torque sensor is greater than the rated torque threshold, the first driving device stops running. When the blocking plate presses the submarine cable, a torque sensor arranged The limiting unit on one side of the blocking plate can limit the one-way rotation of the blocking plate rotating toward the winding drum. After the submarine cable is completely released, the exhaust unit arranged on the ventilation unit is started, and the exhaust unit extracts the air in the accommodating chamber of the ventilation unit, so that the blocking plate rotates toward the side away from the winding drum. Then the winding drum is removed from the bracket and a new winding drum is installed. When the submarine cable is thrown out from the winding drum, the blocking plate is always in contact with the submarine cable, and the submarine cable can be pressed by the blocking plate when it is thrown out. This can ensure that the submarine cable will not directly hit the blocking plate, and at the same time, the blocking plate can always press the submarine cable firmly on the winding drum, thereby ensuring the safety of the surrounding staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram of a cable unwinding device Figure 1 .

[0022] Figure 2 It is a cable unwinding device Figure 1 A local enlarged schematic diagram of point A in the middle.

[0023] Figure 3A three-dimensional diagram of a cable unwinding device Figure 2 .

[0024] Figure 4 It is a cable unwinding device Figure 3 A local enlarged schematic diagram of point B in the middle.

[0025] Figure 5 It is a cable unwinding device Figure 3 A partial enlarged schematic diagram of point C in the middle.

[0026] Figure 6 A side view of a cable unwinding device.

[0027] Figure 7 It is a cable unwinding device Figure 6 Schematic cross-sectional view at DD in the middle.

[0028] Figure 8 It is a cable unwinding device Figure 7 A partial enlarged schematic diagram of point E in the middle.

[0029] Fig. 9 The invention is a cutaway stereoscopic schematic diagram of a cable unwinding device.

[0030] Fig.10 It is a three-dimensional schematic diagram of a cable unwinding device after removing the submarine cable, support unit, mounting frame and slide.

[0031] The numbers in the figure are:

[0032] 1. Winding drum; 11. Submarine cable; 2. Bracket; 21. Support shaft; 3. Blocking plate; 31. Second roller; 4. Driving unit; 41. First driving device; 411. Driving pump; 412. First connecting pipe; 413. Second connecting pipe; 414. Third connecting pipe; 415. Pump body; 416. Oil tank; 417. Third switch valve; 418. Fourth switch valve; 42. Towing rope; 43. Towing drum; 5. Limiting unit ; 51. ventilation unit; 511. ventilation rod; 512. ventilation sleeve; 52. one-way valve; 53. support frame; 54. exhaust unit; 541. exhaust pump; 542. first switch valve; 543. second switch valve; 6. support unit; 61. first roller; 62. lifter; 63. lifting frame; 7. mounting frame; 71. slide; 8. second drive device; 81. rotation drive; 82. plug-in rod; 83. slot. DETAILED DESCRIPTION

[0033] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Reference Figure 1 , Figure 3 and Figure 7 A cable unwinding device comprises a winding drum 1 with a submarine cable 11 wound thereon and a bracket 2 for receiving the winding drum 1; a blocking plate 3 is hinged on the bracket 2, and the blocking plate 3 is an arc-shaped structure. The blocking plate 3 can rotate around the hinge between itself and the bracket 2 and contact with the submarine cable 11 wound on the outermost side of the winding drum 1. The blocking plate 3 presses the submarine cable 11 wound on the outermost side of the winding drum 1 and the pressure is stable within the rated threshold value. When the winding drum 1 rotates to release the submarine cable 11, the blocking plate 3 is always in contact with the submarine cable 11 located on the outermost side of the winding drum 1.

[0035] In the conventional unwinding of the submarine cable 11, the blocking plate 3 is usually not provided on one side of the winding drum 1. Even if the blocking plate 3 is provided, it is mostly fixed. Thus, when the submarine cable 11 wound on the winding drum 1 is continuously unwound, the cylindrical structure formed by the submarine cable 11 wound on the winding drum 1 gradually shrinks, that is, the outer diameter of the cylindrical structure gradually shrinks. Since the blocking plate 3 is fixed, as the submarine cable 11 on the winding drum 1 is gradually unwound, the distance between the submarine cable 11 outside the winding drum 1 and the blocking plate 3 is gradually reduced. The gap is also increasing, and the submarine cable 11 is prone to being thrown out, which often occurs when the submarine cable 11 on the winding drum 1 is about to be unwound. Therefore, when the submarine cable 11 is thrown out, the gap between the submarine cable 11 and the blocking plate 3 is large, so the thrown submarine cable 11 is easy to directly hit the blocking plate 3. The diameter of the submarine cable 11 is large and the weight is heavy. The blocking plate 3 is easy to be damaged after being hit by the thrown submarine cable 11. At the same time, the reaction force of the blocking plate 3 on the submarine cable 11 will also damage the submarine cable 11, and the traditional fixed The blocking plate 3 that is set cannot guarantee that it can fully withstand the impact of the submarine cable 11. In order to avoid the above situation, the blocking plate 3 is hinged on the bracket 2, and a driving unit 4 is set at one end of the blocking plate 3 to drive the blocking plate 3, so that the blocking plate 3 can always fit on the submarine cable 11, and the blocking plate 3 presses the submarine cable 11 wound on the outermost side of the winding drum 1 with a constant pressure, wherein the constant pressure means that the pressure of the blocking plate 3 on the submarine cable 11 is stable within the rated threshold, so that the blocking plate 3 can It is always in contact with the submarine cable 11 wound on the outermost side of the winding drum 1, so that there will be no gap between the submarine cable 11 located on the outermost side of the winding drum 1 and the blocking plate 3. When the submarine cable 11 is thrown out from the winding drum 1, since the blocking plate 3 is always in contact with the submarine cable 11, the submarine cable 11 can be pressed by the blocking plate 3 when it is thrown out, which can ensure that the submarine cable 11 will not directly hit the blocking plate 3, and at the same time, the blocking plate 3 can always press the submarine cable 11 firmly on the winding drum 1, thereby ensuring the safety of the surrounding staff.

[0036] Reference Figure 5 and Figure 6: A driving unit 4 for driving the blocking plate 3 to rotate is arranged on one side of the blocking plate 3, and the driving unit 4 includes a traction rope 42 and a first driving device 41. One end of the traction rope 42 is fixedly arranged on the blocking plate 3, and the first driving device 41 is arranged on the other end of the traction rope 42. When the first driving device 41 is started, the traction rope 42 is reeled up by the first driving device 41.

[0037] Reference Figure 5 , Figure 6 and Fig. 9 A traction disc 43 is fixedly provided on the driving end of the first driving device 41, and one end of the traction rope 42 away from the blocking plate 3 is wound around the traction disc 43. A torque sensor is provided between the first driving device 41 and the traction disc 43. The torque sensor is preset with a rated torque threshold. When the torque detected by the torque sensor is less than the rated torque threshold, the traction disc 43 reels the traction rope 42. When the torque detected by the torque sensor is greater than the rated torque threshold, the traction disc 43 stops reeling in the traction rope 42.

[0038] The rated torque threshold is the same as the rated threshold of the pressure of the blocking plate 3 on the submarine cable 11 . The torque is measured by the torque sensor, and then the pressure of the traction rope 42 when the traction blocking plate 3 presses the submarine cable 11 is measured.

[0039] Reference Figure 2 , Fig. 9 and Fig.10 A limiting unit 5 is provided on one side of the blocking plate 3, and the limiting unit 5 includes a ventilation unit 51 connected to the blocking plate 3. The ventilation unit 51 contains a accommodating cavity. A one-way valve 52 communicating with the accommodating cavity is provided on the ventilation unit 51. The one-way valve 52 allows external air to flow into the accommodating cavity. When the blocking plate 3 rotates toward the side of the winding reel 1, external air flows into the accommodating cavity through the one-way valve 52.

[0040] The ventilation unit 51 includes a ventilation rod 511 and a ventilation sleeve 512, the end of the ventilation rod 511 is hinged on the blocking plate 3, the ventilation sleeve 512 is slidably sleeved on the ventilation rod 511 along the extension direction of the ventilation rod 511, a support frame 53 is vertically arranged on the side of the ventilation sleeve 512 away from the ventilation rod 511, the support frame 53 is fixedly connected to the bracket 2, the end of the ventilation sleeve 512 away from the ventilation rod 511 is hinged to the support frame 53, the one-way valve 52 is arranged on the ventilation sleeve 512, the accommodating cavity is located in the ventilation sleeve 512, the ventilation rod 511 can change the volume of the accommodating cavity when sliding on the ventilation sleeve 512, when the winding drum 1 rotates to release the submarine cable 11 wound around it, the blocking plate 3 is reduced as the cylindrical structure formed by the submarine cable 11 wound around the winding drum 1 is reduced. The pressure of the blocking plate 3 on the submarine cable 11 is provided by the driving unit 4. As the submarine cable 11 is continuously released, the blocking plate 3 that is always pressing the submarine cable 11 rotates as the submarine cable 11 is released. When the blocking plate 3 rotates toward the winding drum 1, the volume of the accommodating cavity in the ventilation unit 51 arranged on the blocking plate 3 needs to be continuously increased, so that the outside air flows into the accommodating cavity through the one-way valve 52. Due to the restriction of the one-way valve 52, the air in the accommodating cavity cannot flow out from the one-way valve 52 to the outside due to the restriction of the one-way valve 52, that is, the blocking plate 3 cannot rotate toward the side away from the winding drum 1, so that the one-way locking of the blocking plate 3 is completed, the load of the traction rope 42 when pulling the blocking plate 3 to rotate is reduced, and the traction rope 42 is prevented from breaking due to excessive tension.

[0041] Reference Figure 2 and Fig.10 : An exhaust unit 54 for extracting the gas in the accommodating chamber is also provided on the ventilation unit 51. The exhaust unit 54 is connected to the accommodating chamber. When the exhaust unit 54 extracts the air in the accommodating chamber, the blocking plate 3 rotates in a direction away from the winding drum 1.

[0042] The air extraction unit 54 includes an air extraction pump 541, a first switch valve 542 and a second switch valve 543. The first switch valve 542 is arranged on the ventilation sleeve 512, and the first switch valve 542 and the ventilation sleeve 512 are connected to each other. The air extraction pump 541 is arranged at the end of the first switch valve 542, and the second switch valve 543 is arranged at the end of the one-way valve 52. When the blocking plate 3 rotates toward the winding drum 1, the first switch valve 542 is in a closed state, and the second switch valve 543 is in an open state. When the Shanghai cable 11 on the winding drum 1 is completely released and a new winding drum 1 needs to be placed on the bracket 2, the first switch valve 542 is opened, the second switch valve 543 is closed, and the air extraction pump 541 is started. The air extraction pump 541 extracts the air in the ventilation sleeve 512 through the opened first switch valve 542, so that the ventilation rod 511 sliding in the ventilation sleeve 512 gradually retracts into the ventilation sleeve 512, and the ventilation rod 511 drives the blocking plate 3 to rotate in the direction away from the winding drum 1.

[0043] Reference Figure 4 The driving unit 4 includes a driving pump 411, which is arranged at the end of the traction plate 43. When the driving end of the driving pump 411 rotates, it can drive the traction plate 43 to rotate. The driving pump 411 is driven by flowing hydraulic oil. When the hydraulic oil flows from the input end to the output end of the driving pump 411, the driving end of the driving pump 411 rotates forward. When the hydraulic oil flows from the output end to the input end of the driving pump 411, the driving end of the driving pump 411 rotates reversely.

[0044] The first driving device 41 further includes a first connecting pipe 412, a second connecting pipe 413, a third connecting pipe 414, a pump body 415, an oil tank 416, a third switch valve 417 and a fourth switch valve 418. One end of the first connecting pipe 412 is arranged on the input end of the driving pump 411, one end of the second connecting pipe 413 is arranged on the output end of the driving pump 411, the pump body 415 is arranged on the first connecting pipe 412, the third switch valve 417 is arranged at the end of the pump body 415, the third connecting pipe 414 is connected in parallel to one side of the pump body 415, the third connecting pipe 414 has two connections with the first connecting pipe 412, the pump body 415 and the third switch valve 417 are connected to the pump body 415. Located between the two connections, the fourth switch valve 418 is arranged on the third connecting pipe 414, an oil tank 416 is arranged at the lower part of the driving pump 411, the end of the first connecting pipe 412 away from the driving pump 411 is connected to the oil tank 416, and the end of the second connecting pipe 413 away from the driving pump 411 is connected to the oil tank 416. When it is necessary to press the blocking plate 3 on the submarine cable 11, the third switch valve 417 is in an open state, the fourth switch valve 418 is in a closed state, the first connecting pipe 412 is in an open state, and the third connecting pipe 414 is in a closed state, the pump body 415 arranged on the first connecting pipe 412 is started and the liquid in the oil tank 416 is pumped into the oil tank 416. The hydraulic oil is pumped into the driving pump 411 under pressure, and the hydraulic oil enters from the input end of the driving pump 411 and is discharged from the output end of the driving pump 411. The discharged hydraulic oil flows back to the oil tank 416 through the third connecting pipe 414. When the blocking plate 3 needs to rotate in the direction away from the winding drum 1, the air pump unit 54 provides the rotation driving force for the blocking plate 3. At this time, the third switch valve 417 is closed and the fourth switch valve 418 is opened. Since the blocking plate 3 rotates in the direction away from the winding drum 1, the blocking plate 3 can pull out the traction rope 42 wound on the traction drum 43, so that the traction drum 43 rotates in the opposite direction. At this time, the hydraulic oil in the oil tank 416 flows through the third connecting pipe 414 flows into the driving pump 411 from the output end of the driving pump 411, and flows out from the input end of the driving pump 411 to the first connecting pipe 412. Since the third switch valve 417 is in a closed state, the hydraulic oil flows back to the oil tank 416 from the third connecting pipe 414, so that the pump body 415 will not be driven to rotate in the opposite direction, thereby ensuring that the pump body 415 will not be damaged, and at the same time, it can also ensure the smoothness of the traction rope 42 when it is pulled out from the traction disk 43. This is because if the hydraulic oil flows from the first connecting pipe 412 through the pump body 415 back to the oil tank 416, the hydraulic oil needs to drive the pump body 415, so the load on the traction rope 42 is large, which can easily cause the traction rope 42 to break.

[0045] Reference Figure 7 and Fig. 9: A support shaft 21 for receiving the winding drum 1 is horizontally arranged on the bracket 2, and a support unit 6 is arranged below the support shaft 21. The support unit 6 includes a first roller 61 that can be lifted and lowered in the vertical direction. The winding drum 1 is installed in front of the support shaft 21, and the first roller 61 descends to the lowest position. After the winding drum 1 is installed, the first roller 61 rises and stops moving after contacting the submarine cable 11 on the winding drum 1.

[0046] The support unit 6 also includes a lifter 62 and a lifting frame 63. The lifter 62 is vertically arranged below the first roller 61. The upper part of the lifter 62 is fixedly arranged with the lifting frame 63. The lifter 62 is driven by hydraulic pressure. After the lifter 62 is started, it can drive the lifting frame 63 to rise and fall in the vertical direction. The first roller 61 is rotatably arranged on the lifting frame 63. A pressure sensor is arranged on the peripheral wall of the first roller 61. When the pressure sensor detects the pressure, the lifter 62 stops pushing the lifting frame 63 to rise. As the submarine cable 11 wound on the winding drum 1 is continuously released, the first roller 61 gradually loses contact with the submarine cable 11, and the pressure sensor can no longer monitor the pressure. At this time, the lifter 62 starts. When the pressure sensor on the first roller 61 senses the pressure again, the lifter 62 stops running.

[0047] Reference Figure 3 and Figure 7-Figure 9 : A mounting bracket 7 is slidably provided along the axial direction of the support shaft 21 at one end of the support shaft 21 away from the bracket 2, and a second driving device 8 is provided on the mounting bracket 7. When the end face of the mounting bracket 7 facing the support shaft 21 is coplanar with the end of the support shaft 21, the second driving device 8 can drive the winding drum 1 to rotate.

[0048] A slide 71 is provided at the lower part of the mounting frame 7 for driving the mounting frame 7 to move along the axis of the support shaft 21. The second driving device 8 includes a rotary driver 81, a plug rod 82 and a slot 83. The rotary driver 81 is horizontally arranged on the mounting frame 7, and the plug rod 82 is fixedly arranged on the output end of the rotary driver 81. The slot 83 is provided at the end of the winding drum 1. When the end face of one side of the mounting frame 7 facing the support shaft 21 is coplanar with the end of the support shaft 21, the plug rod 82 can be inserted into the slot 83, that is, the plug rod 82 is plugged into the slot 83, and the end of the plug rod 82 facing the slot 83 is provided with a chamfer, so that the plug rod 82 can be inserted into the plug more smoothly. In the groove 83, the rotary drive 81 is preferably a servo motor. When all the submarine cables 11 on the winding drum 1 are released, the winding drum 1 on the bracket 2 needs to be removed, and then a new winding drum 1 is inserted into the support shaft 21. In this way, the mounting frame 7 gradually moves away from the support shaft 21 driven by the slide 71, and then the winding drum 1 on the support shaft 21 is removed, and then a new winding drum 1 with the submarine cable 11 wound thereon is inserted into the support shaft 21. The slide 71 drives the mounting frame 7 toward the support shaft 21. When the plug-in rod 82 is inserted into the slot 83, the rotary drive 81 is started, and the rotary drive 81 drives the winding drum 1 to rotate through the plug-in cooperation of the plug-in rod 82 and the slot 83.

[0049] Reference Fig.10 : A plurality of second rollers 31 are rotatably arranged on one side of the blocking plate 3 facing the submarine cable 11. The second rollers 31 are evenly arranged along the arc-shaped extension direction of the blocking plate 3. The axis of the second rollers 31 is parallel to the axis of the winding drum 1 arranged on the bracket 2. The blocking plate 3 contacts the submarine cable 11 through the second rollers 31.

[0050] In this way, when the blocking plate 3 contacts the surface of the submarine cable 11 through the second roller 31, the submarine cable 11 is unwound under the rotation of the winding drum 1, and the friction coefficient between the unwound submarine cable 11 and the blocking plate 3 is significantly reduced, thereby avoiding significant wear of the submarine cable 11 when being unwound.

[0051] Reference Figure 1-Figure 10 The present invention also provides a reeling method for laying a submarine cable, using a cable reeling device, and the specific steps are as follows:

[0052] S1. Place the winding drum 1 with the submarine cable 11 wound thereon on the bracket 2. The first driving device 41 drives the traction drum 43 to reel in the traction rope 42. The traction rope 42 drives the blocking plate 3 to approach the submarine cable 11 wound on the winding drum 1.

[0053] S2. After the blocking plate 3 contacts the submarine cable 11, the torque sensor located between the first drive device 41 and the torque sensor monitors the torque when the traction drum 43 reels the traction rope 42. The torque sensor is preset with a rated torque threshold. When the torque monitored by the torque sensor is less than the rated torque threshold, the first drive device 41 drives the traction drum 43 to continue reeling. When the torque monitored by the torque sensor is greater than the rated torque threshold, the first drive device 41 stops running. When the blocking plate 3 presses the submarine cable 11, the limiting unit 5 arranged on one side of the blocking plate 3 can limit the unidirectional rotation of the blocking plate 3 rotating toward the winding drum 1.

[0054] S3. After the submarine cable 11 is completely released, the exhaust unit 54 arranged on the ventilation unit 51 is started, and the exhaust unit 54 extracts the air in the accommodating cavity of the ventilation unit 51, so that the blocking plate 3 rotates toward the side away from the winding drum 1, and then the winding drum 1 is removed from the bracket 2 and a new winding drum 1 is installed.

[0055] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A cable unwinding device, comprising a winding drum (1) on which a submarine cable (11) is wound, and a bracket (2) for receiving the winding drum (1); It is characterized in that A blocking plate (3) is hingedly connected to the support (2). The blocking plate (3) is an arc-shaped structure. The blocking plate (3) can rotate around the hinge between itself and the support (2) and contact the submarine cable (11) wound on the outermost side of the winding drum (1). The blocking plate (3) presses the submarine cable (11) wound on the outermost side of the winding drum (1) and the pressure is stable within a rated threshold. When the winding drum (1) rotates to release the submarine cable (11), the blocking plate (3) always contacts the submarine cable (11) located on the outermost side of the winding drum (1). A driving unit (4) for driving the blocking plate (3) to rotate is provided on one side of the blocking plate (3), the driving unit (4) comprising a traction rope (42) and a first driving device (41), one end of the traction rope (42) being fixedly arranged on the blocking plate (3), the first driving device (41) being arranged on the other end of the traction rope (42), and when the first driving device (41) is started, the traction rope (42) is reeled up by the first driving device (41); A traction disc (43) is fixedly arranged on the driving end of the first driving device (41); one end of the traction rope (42) away from the blocking plate (3) is wound around the traction disc (43); a torque sensor is arranged between the first driving device (41) and the traction disc (43); the torque sensor is preset with a rated torque threshold; when the torque detected by the torque sensor is less than the rated torque threshold, the traction disc (43) reels the traction rope (42); when the torque detected by the torque sensor is greater than the rated torque threshold, the traction disc (43) stops reeling the traction rope (42); A limiting unit (5) is provided on one side of the blocking plate (3), the limiting unit (5) comprising a ventilation unit (51) connected to the blocking plate (3), a receiving cavity being provided in the ventilation unit (51), a one-way valve (52) being provided on the ventilation unit (51) and being able to communicate with the receiving cavity, the one-way valve (52) being able to allow external air to flow into the receiving cavity, and when the blocking plate (3) rotates toward one side of the winding reel (1), external air flows into the receiving cavity through the one-way valve (52); The drive unit (4) comprises a drive pump (411), which is arranged at the end of the traction plate (43). When the drive end of the drive pump (411) rotates, the traction plate (43) can be driven to rotate. The drive pump (411) is driven by flowing hydraulic oil. When the hydraulic oil flows from the input end to the output end of the drive pump (411), the drive end of the drive pump (411) rotates in the forward direction. When the hydraulic oil flows from the output end to the input end of the drive pump (411), the drive end of the drive pump (411) rotates in the reverse direction. A support shaft (21) for receiving the winding drum (1) is horizontally arranged on the bracket (2), and a support unit (6) is arranged below the support shaft (21). The support unit (6) includes a first roller (61) that can be raised and lowered in a vertical direction. When the winding drum (1) is installed in front of the support shaft (21), the first roller (61) is lowered to the lowest position. When the winding drum (1) is installed, the first roller (61) is raised and stops moving after contacting the submarine cable (11) on the winding drum (1). A mounting frame (7) is slidably provided at one end of the support shaft (21) away from the bracket (2) along the axial direction of the support shaft (21), and a second driving device (8) is provided on the mounting frame (7). When an end surface of the mounting frame (7) facing the support shaft (21) is coplanar with an end of the support shaft (21), the second driving device (8) can drive the winding drum (1) to rotate; A plurality of second rollers (31) are rotatably arranged on a side of the blocking plate (3) facing the submarine cable (11); the second rollers (31) are evenly arranged along the arc-shaped extension direction of the blocking plate (3); the axes of the second rollers (31) are parallel to the axes of the winding drums (1) arranged on the bracket (2); and the blocking plate (3) contacts the submarine cable (11) via the second rollers (31).

2. A cable unwinding device according to claim 1, characterized in that: An exhaust unit (54) for extracting gas from the accommodating chamber is also provided on the ventilation unit (51); the exhaust unit (54) is in communication with the accommodating chamber; when the exhaust unit (54) extracts air from the accommodating chamber, the blocking plate (3) rotates in a direction away from the winding drum (1).

3. A method for unwinding a submarine cable, using a cable unwinding device as claimed in claim 2, characterized in that: The specific steps are as follows: S1. placing a winding drum (1) wound with a submarine cable (11) on a support (2), and driving a traction drum (43) by a first driving device (41) to reel in a traction rope (42), so that the traction rope (42) drives a blocking plate (3) toward the submarine cable (11) wound on the winding drum (1); S2. After the blocking plate (3) contacts the submarine cable (11), a torque sensor located between the first driving device (41) and the torque sensor monitors the torque when the traction drum (43) reels the traction rope (42). The torque sensor is preset with a rated torque threshold. When the torque monitored by the torque sensor is less than the rated torque threshold, the first driving device (41) drives the traction drum (43) to continue reeling. When the torque monitored by the torque sensor is greater than the rated torque threshold, the first driving device (41) stops running. When the blocking plate (3) presses the submarine cable (11), a limiting unit (5) arranged on one side of the blocking plate (3) can limit the unidirectional rotation of the blocking plate (3) rotating toward the winding drum (1); S3. After the submarine cable (11) is completely released, the air extraction unit (54) provided on the ventilation unit (51) is started, and the air extraction unit (54) extracts the air in the receiving chamber of the ventilation unit (51), so that the blocking plate (3) rotates toward the side away from the winding drum (1), and then the winding drum (1) is removed from the bracket (2) and a new winding drum (1) is installed.

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