Moment limiting device of electric anchor and mooring equipment and using method

Abstract

The invention provides an electric anchor and mooring equipment moment limiting device and a using method, and relates to the field of electric anchor and mooring equipment. The anchor and mooring equipment comprises an anchor and mooring equipment base and a motor installed on the top of the anchor and mooring equipment base through external bolts. The speed reducer is fixed at the power output end of the motor; the main shaft assembly is fixed at the power output end of the speed reducer; the locking assembly is arranged outside the main shaft assembly, and the limiting assembly is arranged outside the locking assembly; the main shaft assembly comprises a cable main shaft fixed at the power output end of the speed reducer; the limiting grooves are formed in the surface of the cable main shaft and evenly distributed at equal intervals, and a plurality of strain gauges which are evenly distributed at equal intervals are embedded in the surface of the cable main shaft. By means of the locking assembly, the piston rod can drive the tail magnet to be inserted into the limiting groove, mechanical locking is conducted on the cable main shaft, stability is high, and after the motor fails, the cable main shaft can be rapidly locked and fixed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric anchor winch, in particular to an electric anchor winch torque limiting device and method. BACKGROUND

[0002] The torque limiting device of the anchor winch is the core component to ensure the safe operation of the equipment, which prevents the shaft system from breaking, the gear from being damaged or the motor from being burned out due to overload by real-time monitoring and limiting the torque output of the transmission system.

[0003] Usually, strain gauges or magnetoelastic sensors are used to collect torque data of the transmission shaft or key components in real time, and the friction force between the friction plates is controlled by spring pressure. When overloaded, the friction plates slide relative to each other, cutting off the power transmission.

[0004] The patent with publication number CN205472392U discloses a torque limiting device for an electric anchor winch, which includes a motor, a transmission rod, a planetary reducer, a reduction gear box, an amplifier board, and an electrical control device. The input shaft of the planetary reducer is connected to the motor, and the output shaft is connected to the reduction gear box. The planetary reducer is provided with a housing, and the transmission rod is fixed to the housing. The end of the transmission rod is provided with a torsion sensor, which is electrically connected to the amplifier board. The amplifier board and the motor are electrically connected to the electrical control device. The device realizes the safety torque limitation of the anchor winch and the self-tensioning function of the cable, has the advantages of reasonable structure, easy installation, and simple debugging, and can greatly improve the safety and reliability of the equipment.

[0005] The current torque limiting device of the electric anchor winch directly stops work by power-off protection or designs a shaft coupling or clutch to make the motor disconnect from the load when overloaded to avoid burning out. However, the main shaft directly bears the tension of the anchor chain or cable, and if the main shaft cannot be quickly mechanically locked, the main shaft is prone to damage. SUMMARY

[0006] The present application aims to provide an electric anchor winch torque limiting device and method to solve the problems raised in the background and overcome the existing technical defects.

[0007] To solve the above technical problems, the technical solution adopted by the present application is as follows: an electric anchor winch torque limiting device, which includes an anchor winch base, a motor installed on the top of the anchor winch base by external bolts, a reduction machine fixed to the power output end of the motor, a main shaft assembly fixed to the power output end of the reduction machine, a locking assembly arranged outside the main shaft assembly, and a limiting assembly arranged outside the locking assembly. The main shaft assembly comprises a cable main shaft fixed to the power output end of the speed reducer, a plurality of equidistantly and uniformly distributed limiting grooves opened on the surface of the cable main shaft, and a plurality of equidistantly and uniformly distributed strain gauges embedded on the surface of the cable main shaft. The limiting assembly comprises a rotating ring rotatably installed outside the cable main shaft, a lever fixed to the surface of the rotating ring, an arc-shaped frame arranged outside the lever, and a limiting screw rod penetrating through the inside of the arc-shaped frame. The locking assembly comprises a hydraulic cylinder fixed to the side of the rotating ring facing the cable main shaft, a piston rod slidably connected to one end of the hydraulic cylinder, a fixed magnet sleeved outside the piston rod, and a tail magnet arranged on one side of the fixed magnet.

[0008] As a further scheme of the present application, the main shaft assembly further comprises a support disc arranged on the top of the anchor winch base and a support back plate arranged on one side of the support disc, and the cable main shaft penetrates through the inside of the support disc.

[0009] As a further scheme of the present application, a limiting screw hole matched with the limiting screw rod is opened on the surface of the support back plate, and the limiting screw hole is threadedly connected with the limiting screw rod.

[0010] As a further scheme of the present application, the locking assembly further comprises a rubber damping block pasted on one side of the tail magnet, the cross section of the limiting groove is a triangular structure, and the rubber damping block is arranged at the deeper end of the limiting groove close to the tail magnet.

[0011] As a further scheme of the present application, the locking assembly further comprises a first connecting pipe fixed to one end of the hydraulic cylinder and a second connecting pipe arranged below the first connecting pipe.

[0012] As a further scheme of the present application, the locking assembly further comprises an oil delivery pipe fixed to the end of the first connecting pipe, an oil return pipe fixed to the end of the second connecting pipe, a delivery pipe fixed to the ends of the oil return pipe and the oil delivery pipe, and an oil tank body fixed to the end of the delivery pipe.

[0013] As a further scheme of the present application, the oil tank body is fixed to the side of the support back plate, an oil pump is installed on the top of the oil tank body, the oil tank body is connected with the hydraulic cylinder through the oil pump, the delivery pipe, the oil return pipe, the second connecting pipe and the first connecting pipe.

[0014] As a further scheme of the present application, the hydraulic cylinder is matched with the position of the limiting groove, the same-polarity magnetic poles of the fixed magnet and the tail magnet are arranged opposite to each other, a buffer spring is arranged between the fixed magnet and the tail magnet, and the buffer spring is sleeved outside the piston rod.

[0015] As a further scheme of the present application: one end of the rotating ring is rotatably embedded in the inside of the support back plate, and an annular limiting groove is arranged at the connecting position of the support back plate and the rotating ring.

[0016] As a further scheme of the present application: a use method of an electric anchor winch torque limiting device, comprising the following steps: S1, torque detection: the torque of the cable main shaft is monitored by the strain gauge, and the data is transmitted to the PLC controller, and the motor is controlled by the PLC controller, and the motor stops when the torque is large; S2, mechanical locking: after the hydraulic oil enters the hydraulic cylinder, the piston rod is pushed, the tail magnet at the bottom of the piston rod and the rubber damping block are clamped into the limiting groove of the cable main shaft, and the cable main shaft is locked again under the action of the piston rod; S3, linkage buffering: after the piston rod is stretched out, the distance between the tail magnet and the fixed magnet can be adjusted according to the pressure change, the buffer spring is elastically stretched and contracted, the impact energy is absorbed by the hydraulic oil, and at the same time, the rubber damping block on one side of the tail magnet is extruded to produce elastic deformation to absorb energy, realizing flexible locking; S4, manual limiting: the lever is manually rotated, the lever drives the rotating ring to rotate, the rotating ring drives the hydraulic cylinder to rotate, and the piston rod of the hydraulic cylinder is rotated into the limiting groove, the limiting screw can be inserted into the arc-shaped frame and is screwed with the limiting threaded hole on the support back plate, realizing manual limiting.

[0017] Compared with the prior art, the present application has the following advantages: 1. By setting the locking assembly, the piston rod can drive the tail magnet to insert into the limiting groove to mechanically lock the cable main shaft, which has high stability, and can quickly lock the cable main shaft after the motor fails, fixing the cable main shaft; 2. By setting the fixed magnet and the tail magnet on the tail of the piston rod, and setting the buffer spring between the fixed magnet and the tail magnet, a certain buffering effect is realized; 3. By setting the limiting assembly, the lever can drive the rotating ring to rotate, the rotating ring drives the hydraulic cylinder to adjust the angle, and the piston rod of the hydraulic cylinder can be rotated into the limiting groove, the limiting screw is inserted into the arc-shaped frame and is screwed with the limiting threaded hole on the support back plate, realizing manual limiting. BRIEF DESCRIPTION OF DRAWINGS

[0018] The disclosure of the present application will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings, the same reference numerals are used to refer to the same parts. Among them: Figure 1 The overall structure schematic diagram according to one embodiment of the present application is shown schematically. Figure 2 The schematic diagram shows a half-section structure according to one embodiment of the present invention; Figure 3 The schematic diagram shows a structural schematic of a rotating ring according to an embodiment of the present invention; Figure 4 The schematic diagram shows a structural schematic of a locking component according to an embodiment of the present invention; Figure 5 The schematic diagram shows a structural schematic of an arc-shaped frame according to an embodiment of the present invention; Figure 6 The schematic diagram shows a structural schematic of a cable spindle according to an embodiment of the present invention; Figure 7 The schematic diagram shows a cross-sectional structure of a cable spindle according to an embodiment of the present invention; Figure 8 The schematic diagram shows a piston rod structure according to one embodiment of the present invention.

[0019] The following are the labeling elements in the diagram: 1. Anchor winch base; 2. Motor; 3. Reducer; 4. Main shaft assembly; 401. Cable main shaft; 402. Support plate; 403. Support back plate; 404. Limiting groove; 5. Locking assembly; 501. Oil tank body; 502. Delivery pipe; 503. Oil supply pipe; 504. Return pipe; 505. Hydraulic cylinder; 506. Rubber damping block; 507. Buffer spring; 508. Tail magnet; 509. First connecting pipe; 510. Second connecting pipe; 511. Piston rod; 512. Fixed magnet; 6. Limiting assembly; 601. Rotating ring; 602. Lever; 603. Limiting screw; 604. Arc frame; 605. Limiting threaded hole; 7. Strain gauge. Detailed Implementation

[0020] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0021] An embodiment of the present invention is illustrated in conjunction with the accompanying drawings.

[0022] Example 1: Please see Figures 1-8For the first embodiment of the application, the embodiment provides an electric anchor winch torque limiting device, which comprises an anchor winch base 1, a motor 2 mounted on the top of the anchor winch base 1 through external bolts, a speed reducer 3 fixed to the power output end of the motor 2, a main shaft assembly 4 fixed to the power output end of the speed reducer 3, a locking assembly 5 arranged outside the main shaft assembly 4, and a limiting assembly 6 arranged outside the locking assembly 5. The main shaft assembly 4 comprises a cable main shaft 401 fixed to the power output end of the speed reducer 3, a plurality of equidistant and uniformly distributed limiting grooves 404 opened on the surface of the cable main shaft 401, and a plurality of equidistant and uniformly distributed strain gauges 7 embedded on the surface of the cable main shaft 401. The limiting assembly 6 comprises a rotating ring 601 rotatably mounted outside the cable main shaft 401, a lever 602 fixed to the surface of the rotating ring 601, an arc-shaped frame 604 arranged outside the lever 602, and a limiting screw 603 penetrating through the inside of the arc-shaped frame 604. The locking assembly 5 comprises a hydraulic cylinder 505 fixed to one side of the rotating ring 601 facing the cable main shaft 401, a piston rod 511 slidably connected to one end of the hydraulic cylinder 505, a fixed magnet 512 sleeved outside the piston rod 511, and a tail magnet 508 arranged on one side of the fixed magnet 512.

[0023] It should be noted that a plurality of strain gauges 7 are attached to the cable main shaft 401. When the cable main shaft 401 is subjected to torsion and deforms, the resistance value of the strain gauge changes, which is converted into a voltage signal through a Wheatstone bridge, and the torque value is obtained after amplification and filtering. The data is transmitted to the PLC controller, and the PLC controller is electrically connected with the motor 2, so as to control the motor 2. When the strain gauge 7 detects a large torque, the motor 2 can be stopped through the PLC controller, and the hydraulic cylinder 505 can be controlled to work. After the oil pump works, the hydraulic oil enters the hydraulic cylinder 505, which can push the piston rod 511. The tail magnet 508 at the bottom of the piston rod 511 and the rubber damping block 506 are clamped into the limiting groove 404 of the cable main shaft 401, so as to achieve the locking and limiting of the cable main shaft 401.

[0024] Further, the main shaft assembly 4 further comprises a support disc 402 arranged on the top of the anchor winch base 1, and a support back plate 403 arranged on one side of the support disc 402; the cable main shaft 401 penetrates the inside of the support disc 402.

[0025] It should be noted that the cable main shaft 401 is rotatably connected with the support disc 402, the support disc 402 is fixedly connected with the support back plate 403, the cable main shaft 401 is connected with the power output end of the speed reducer 3, and when the motor 2 works, the power output end of the motor 2 drives the speed reducer 3, and the power output end of the speed reducer 3 drives the cable main shaft 401 to rotate, so as to wind the cable.

[0026] Further, the surface of the support back plate 403 is provided with a limiting threaded hole 605 matched with the limiting screw rod 603, and the limiting threaded hole 605 is threadedly connected with the limiting screw rod 603.

[0027] It should be noted that the end of the limiting screw rod 603 is provided with a thread, and is threadedly connected with the limiting threaded hole 605, and the limiting screw rod 603 can be inserted into the through hole of the arc-shaped frame 604, and the through hole matched with the through hole of the arc-shaped frame 604 is provided on the shift lever 602, and is used for the limiting screw rod 603 to pass through.

[0028] Further, the locking assembly 5 further comprises a rubber damping block 506 attached to one side of the tail magnet 508, the limiting groove 404 has a triangular structure, and the rubber damping block 506 is arranged at the deeper end of the limiting groove 404 close to the tail magnet 508.

[0029] It should be noted that when the tail magnet 508 is in contact with the deeper end of the limiting groove 404, the rubber damping block 506 can be extruded, so that the rubber damping block 506 is elastically deformed to absorb energy and achieve flexible locking.

[0030] In the embodiment, the piston rod 511 can drive the tail magnet 508 to insert into the limiting groove 404 to mechanically lock the cable main shaft 401, and the stability is high, and after the motor 2 fails, the cable main shaft 401 can be quickly locked and fixed.

[0031] Embodiment 2: Please refer to Figures 5-8 For the first embodiment of the application, the embodiment provides a torque limiting device for an electric anchor winch.

[0032] Further, the locking assembly 5 further comprises a first connecting pipe 509 fixed to one end of the hydraulic cylinder 505, and a second connecting pipe 510 arranged below the first connecting pipe 509.

[0033] It should be noted that the first connecting pipe 509 and the second connecting pipe 510 are respectively connected with the hydraulic cylinder 505 for the passage of hydraulic oil, and after the hydraulic oil enters the hydraulic cylinder 505, the piston rod 511 is pushed, and the tail magnet 508 and the rubber damping block 506 at the bottom of the piston rod 511 are clamped into the limiting groove 404 of the cable main shaft 401, and the cable main shaft 401 is affected by the piston rod 511 to be locked again.

[0034] Further, the locking assembly 5 further comprises an oil delivery pipe 503 fixed to the end of the first connecting pipe 509, an oil return pipe 504 fixed to the end of the second connecting pipe 510, a delivery pipe 502 fixed to the ends of the oil return pipe 504 and the oil delivery pipe 503, and an oil tank main body 501 fixed to the end of the delivery pipe 502.

[0035] It should be noted that the oil delivery pipe 503 and the oil return pipe 504 are circular ring structures, which are used to connect a plurality of hydraulic cylinders 505.

[0036] Further, the oil tank body 501 is fixed on the side of the support back plate 403, the top of the oil tank body 501 is provided with an oil pump, and the oil tank body 501 is connected with the hydraulic cylinder 505 through the oil pump, the delivery pipe 502, the oil return pipe 504, and the second connecting pipe 510, and the oil tank body 501 is connected with the hydraulic cylinder 505 through the oil pump, the delivery pipe 502, the oil delivery pipe 503, and the first connecting pipe 509.

[0037] It should be noted that the first connecting pipe 509 and the second connecting pipe 510 are arranged on each hydraulic cylinder 505, which are used for oil injection and oil return, and realize the extension and retraction of the piston rod 511 on the hydraulic cylinder 505.

[0038] Further, the hydraulic cylinder 505 is matched with the position of the limiting groove 404, the same polarity of the fixed magnet 512 and the tail magnet 508 is arranged oppositely, the buffer spring 507 is arranged between the fixed magnet 512 and the tail magnet 508, and the buffer spring 507 is sleeved outside the piston rod 511.

[0039] It should be noted that the fixed magnet 512 is fixed on one end of the piston rod 511 close to the hydraulic cylinder 505, and the tail magnet 508 is fixed on the other end of the piston rod 511 away from the hydraulic cylinder 505, and the fixed magnet 512 and the tail magnet 508 are elastically connected through the buffer spring 507, and the fixed magnet 512 and the tail magnet 508 repel each other.

[0040] Further, one end of the rotating ring 601 is rotatably embedded in the inside of the support back plate 403, and the connecting part of the support back plate 403 and the rotating ring 601 is provided with an annular limiting groove.

[0041] It should be noted that the rotating ring 601 can rotate in the hollow support back plate 403, and the angle of the rotating ring 601 can be adjusted.

[0042] In this embodiment, the fixed magnet 512 and the tail magnet 508 are arranged at the tail of the piston rod 511, and the buffer spring 507 is arranged between the fixed magnet 512 and the tail magnet 508, so as to achieve a certain buffering effect. Through the limiting assembly 6, the rotating ring 601 can be driven to rotate by the lever 602, the rotating ring 601 drives the hydraulic cylinder 505 to adjust the angle, and the piston rod 511 of the hydraulic cylinder 505 can be rotated into the limiting groove 404, the limiting screw 603 is inserted into the arc-shaped frame 604, and is screwed with the limiting screw hole 605 on the support back plate 403, so as to realize manual limiting.

[0043] Embodiment 3: Please refer to Figures 1-8 For the third embodiment of the present application, the embodiment provides a use method of an electric anchor winch torque limiting device, including the following steps: S1, torque detection: the strain gauge 7 monitors the torque of the cable main shaft 401 and transmits data to the PLC controller, and the PLC controller controls the motor 2, and the motor 2 stops when the torque is large; S2, mechanical locking: after the hydraulic oil enters the hydraulic cylinder 505, the piston rod 511 is pushed, and the tail magnet 508 at the bottom of the piston rod 511 and the rubber damping block 506 are clamped into the limiting groove 404 of the cable main shaft 401, and the cable main shaft 401 is affected by the piston rod 511, and the cable main shaft 401 is locked twice; S3, linkage buffering: after the piston rod 511 is stretched out, the distance between the tail magnet 508 and the fixed magnet 512 can be adjusted according to the pressure change, the buffer spring 507 is elastically stretched and contracted, the impact energy is absorbed by the hydraulic oil, and at the same time, the rubber damping block 506 on one side of the tail magnet 508 is extruded to produce elastic deformation, absorb energy, and realize flexible locking; S4, manual limiting: manually rotating the lever 602 drives the rotating ring 601 to rotate, and the rotating ring 601 drives the hydraulic cylinder 505 to rotate, and the piston rod 511 of the hydraulic cylinder 505 is rotated to the inside of the limiting groove 404, and the limiting screw 603 can be inserted into the arc-shaped frame 604 and screwed with the limiting threaded hole 605 on the supporting back plate 403, to realize manual limiting.

[0044] Working principle: a plurality of strain gauges 7 are pasted on the cable main shaft 401, when the cable main shaft 401 is subjected to torsion torque and produces torsional deformation, the resistance value of the strain gauge changes, which is converted into a voltage signal through the Wheatstone bridge, and the torque value is obtained after amplification and filtering, and the data is transmitted to the PLC controller, the PLC controller is electrically connected with the motor 2, so as to control the motor 2, when the strain gauge 7 detects that the torque is large, the motor 2 can be stopped through the PLC controller, after the hydraulic oil enters the hydraulic cylinder 505, the piston rod 511 is pushed, the tail magnet 508 at the bottom of the piston rod 511 and the rubber damping block 506 are clamped into the limiting groove 404 of the cable main shaft 401, the cable main shaft 401 is acted on by the piston rod 511, and the cable main shaft 401 is locked twice, after the piston rod 511 is stretched out, the spacing between the tail magnet 508 and the fixed magnet 512 can be adjusted with the change of pressure, the buffer spring 507 is elastically stretched and contracted, cooperates with the hydraulic oil to absorb impact energy, at the same time, the rubber damping block 506 on one side of the tail magnet 508 is extruded to produce elastic deformation, absorbs energy, realizes flexible locking, the rotating ring 601 is driven to rotate by the push rod 602, the rotating ring 601 drives the hydraulic cylinder 505 to rotate, and the piston rod 511 of the hydraulic cylinder 505 rotates to the inside of the limiting groove 404, the limiting screw 603 can be inserted into the arc-shaped frame 604 and is screwed with the limiting threaded hole 605 on the supporting back plate 403, so as to realize manual limiting.

[0045] The technical scope of the present application is not limited to the above description, and those skilled in the art can make various modifications and changes to the above embodiments without departing from the technical idea of the present application, and these modifications and changes should be within the protection scope of the present application.

Claims

1. An electrically powered anchor winch torque limiting device characterised in that, The anchor winch base (1) is provided with a motor (2) installed on the top of the anchor winch base (1) by external bolts, a speed reducer (3) fixed to the power output end of the motor (2), a main shaft assembly (4) fixed to the power output end of the speed reducer (3), a locking assembly (5) arranged outside the main shaft assembly (4), and a limiting assembly (6) arranged outside the locking assembly (5). The main shaft assembly (4) comprises a cable main shaft (401) fixed to the power output end of the speed reducer (3), a plurality of equidistant and uniformly distributed limiting grooves (404) opened on the surface of the cable main shaft (401), and a plurality of equidistant and uniformly distributed strain gauges (7) embedded on the surface of the cable main shaft (401). The limiting assembly (6) comprises a rotating ring (601) rotatably installed outside the cable main shaft (401), a lever (602) fixed to the surface of the rotating ring (601), an arc-shaped frame (604) arranged outside the lever (602), and a limiting screw rod (603) penetrating through the inside of the arc-shaped frame (604). The locking assembly (5) comprises a hydraulic cylinder (505) fixed to one side of the rotating ring (601) facing the cable main shaft (401), a piston rod (511) slidably connected to one end of the hydraulic cylinder (505), a fixed magnet (512) sleeved outside the piston rod (511), and a tail magnet (508) arranged on one side of the fixed magnet (512).

2. An electrically powered anchor winch torque limiting device according to claim 1 wherein, The main shaft assembly (4) further comprises a support disc (402) arranged on the top of the anchor winch base (1), and a support back plate (403) arranged on one side of the support disc (402), and the cable main shaft (401) penetrates through the inside of the support disc (402).

3. An electrically powered anchor winch torque limiting device according to claim 2, characterised in that, The surface of the support back plate (403) is provided with a limiting screw hole (605) matched with the limiting screw rod (603), and the limiting screw hole (605) is threadedly connected with the limiting screw rod (603).

4. An electrically powered anchor winch torque limiting device according to claim 3 wherein, The locking assembly (5) further comprises a rubber damping block (506) attached to one side of the tail magnet (508), the cross section of the limiting groove (404) is a triangular structure, and the rubber damping block (506) is arranged at the deeper end of the limiting groove (404) close to the tail magnet (508).

5. An electrically powered anchor winch torque limiting device according to claim 4 wherein, The locking assembly (5) further comprises a first connecting pipe (509) fixed to one end of the hydraulic cylinder (505), and a second connecting pipe (510) arranged below the first connecting pipe (509).

6. An electrically powered anchor winch torque limiting device according to claim 5 wherein, The locking assembly (5) further comprises an oil delivery pipe (503) fixed to the end of the first connecting pipe (509), an oil return pipe (504) fixed to the end of the second connecting pipe (510), a delivery pipe (502) fixed to the ends of the oil return pipe (504) and the oil delivery pipe (503), and an oil tank body (501) fixed to the end of the delivery pipe (502).

7. An electrically powered mooring winch torque limiting device according to claim 6, characterised in that, The oil tank body (501) is fixed on the side of the support back plate (403), the top of the oil tank body (501) is provided with an oil pump, and the oil tank body (501) is connected with the hydraulic cylinder (505) through the oil pump, the delivery pipe (502), the oil return pipe (504), the second connecting pipe (510), and the oil tank body (501) is connected with the hydraulic cylinder (505) through the oil pump, the delivery pipe (502), the oil delivery pipe (503) and the first connecting pipe (509).

8. An electrically powered anchor winch torque limiting device according to claim 7, characterised in that, The hydraulic cylinder (505) is matched with the position of the limiting groove (404), the same poles of the fixed magnet (512) and the tail magnet (508) are arranged oppositely, the buffer spring (507) is arranged between the fixed magnet (512) and the tail magnet (508), and the buffer spring (507) is arranged outside the piston rod (511).

9. An electrically powered anchor winch torque limiting device according to claim 8, characterised in that, One end of the rotating ring (601) is rotatably embedded in the inside of the support back plate (403), and the connecting part of the support back plate (403) and the rotating ring (601) is provided with an annular limiting groove.

10. A method of using a torque limiting device for an electrically powered anchor winch as claimed in any one of claims 1 to 9, characterised by: The method comprises the following steps: S1, torque detection: the strain gauge (7) monitors the torque of the cable main shaft (401) and transmits data to the PLC controller, and the PLC controller controls the motor (2), and the motor (2) stops when the torque is large; S2, mechanical locking: after the hydraulic oil enters the hydraulic cylinder (505), the piston rod (511) is pushed, the tail magnet (508) at the bottom of the piston rod (511) and the rubber damping block (506) are clamped into the limiting groove (404) of the cable main shaft (401), and the cable main shaft (401) is affected by the piston rod (511) to lock the cable main shaft (401) again; S3, linkage buffering: after the piston rod (511) is stretched out, the distance between the tail magnet (508) and the fixed magnet (512) can be adjusted according to the pressure change, the buffer spring (507) is elastically stretched and contracted, cooperates with the hydraulic oil to absorb impact energy, at the same time, the rubber damping block (506) on one side of the tail magnet (508) is extruded to produce elastic deformation, absorbs energy, realizes flexible locking; S4, manual limiting: manually rotating the lever (602), the lever (602) drives the rotating ring (601) to rotate, the rotating ring (601) drives the hydraulic cylinder (505) to rotate, and the piston rod (511) of the hydraulic cylinder (505) is rotated into the limiting groove (404), the limiting screw rod (603) can be inserted into the arc-shaped frame (604), and is screwed with the limiting threaded hole (605) on the support back plate (403), so as to realize manual limiting.

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