CN105857519A - Four-anchor positioning system of engineering ship - Google Patents

Abstract

The invention provides a four-anchor positioning system for an engineering ship. The four-anchor positioning system includes four anchor positioning devices. The anchor positioning device includes a positioning pile, a windlass, an anchor, an anchor chain, a positioning pipe arranged on the hull, and a power cabin , the upper end of the power cabin is provided with a circular opening, the positioning pile is arranged in the positioning pipe, the upper end of the positioning pile is inserted in the opening, the lower end is provided with a motor cabin, the lower end of the motor cabin has a reel, and the motor cabin is provided with a drive The driving device for reel rotation, the power cabin is equipped with a lifting mechanism that moves the positioning pile up and down and a limit mechanism that can prevent the circumferential rotation of the positioning pile. One end of the anchor chain is fixed through the windlass and the interior of the anchor chain cabin. One end is connected with an anchor, the sliding sleeve on the anchor chain is provided with a positioning sleeve, and a chain rope is wound on the drum. One end of the chain rope is fixedly connected to the drum, and the other end is fixedly connected to the positioning sleeve. Tow piece for positioning the casing to move along the anchor chain. The invention can make the positioning of the ship more stable and the working range wider.

Description

A four-anchor positioning system for engineering ships

technical field

The invention belongs to the technical field of ship equipment and relates to a four-anchor positioning system for an engineering ship.

Background technique

Some special-purpose ships such as marine survey ships, marine geological drilling ships, and petroleum engineering ships need to locate the engineering ships at a more accurate position in order to obtain survey samples at predetermined positions when conducting offshore engineering operations. Most of the engineering ships are anchored or pile-fixed three-pile or four-pile positioning equipment. Although the pile-fixed positioning technology has high positioning accuracy and is not affected by the tide after positioning, the operation coverage area is very limited after positioning, only limited to the area covered by the track on the deck, resulting in the construction area being divided according to the size of the ship's position, and the positioning points are huge . When moving the position of the ship, it is necessary to repeatedly lift and lower the positioning piles and calibrate the positioning points, which is only applicable to the needs of small-scale operations. On the other hand, the suspended hull has a great impact on the stability of the hull, and there are potential safety hazards. In the traditional anchored ship positioning, four marine windlasses are installed on the deck of the ship, and the four corners of the deck are guided by the rollers. The coverage area of single anchoring can reach 1 square kilometer, the operation range is wide, and the number of positioning is relatively small. With anchor positioning, since a long part of the anchor chain from the ship to the seabed is in a heaving state, its positioning accuracy is affected by tides and currents, and it is very unstable. If the anchor chain is over-tensioned, it is easy to move the anchor, damage equipment or even Cause personal safety accidents; if the anchor chain is soft, it is easy to cause repeated positioning and correction times to increase, and the efficiency will decrease.

Contents of the invention

The object of the present invention is to solve the above-mentioned problems in the existing technology, and propose a four-anchor positioning system for engineering ships. The four-anchor positioning system for engineering ships can make ship positioning more stable and have a wider working range.

The purpose of the present invention can be achieved through the following technical solutions: a four-anchor positioning system of an engineering ship, the engineering ship includes a hull and a chain locker arranged in the hull, and the four-anchor positioning system includes four anchor positioning devices , the four anchor positioning devices are symmetrically arranged on both sides of the bow and stern of the engineering ship, and the anchor positioning devices include positioning piles, windlasses, anchors, anchor chains, positioning pipes arranged on the hull, and power cabins , the positioning tube is arranged vertically, the lower end of the positioning tube penetrates the bottom outer plate on the hull, and the upper end penetrates the main deck on the hull, the power cabin is arranged on the main deck, the upper end of the positioning tube and the power cabin Connected, the upper end of the power cabin is provided with a circular opening, the opening and the positioning pipe are coaxially arranged, the positioning pile is vertically arranged in the positioning pipe, the upper end of the positioning pile is inserted in the opening, and the lower end A motor cabin is provided, the lower end of the motor cabin is rotatably provided with a reel, the motor cabin is provided with a driving device capable of driving the reel to rotate in the circumferential direction, and the power cabin is provided with a lifter capable of moving the positioning pile up and down. mechanism and a limit mechanism that can prevent the circumferential rotation of the positioning pile, the windlass is fixedly connected on the main deck of the hull, one end of the anchor chain is fixed through the windlass and the interior of the chain locker, and the other end is detachably connected There is an anchor, the sliding sleeve on the anchor chain is provided with a positioning sleeve, and a chain rope is wound on the reel, one end of the chain rope is fixedly connected to the reel, and the other end is fixedly connected to the positioning sleeve. The hull is provided with a traction piece that can drive the positioning sleeve to move along the anchor chain. The traction piece includes a winder and a traction rope. A connecting ring is rotatably connected to the outer peripheral wall of the positioning sleeve. One end of the traction rope It is fixedly connected and wound on the winding drum of the winding machine, and the other end is fixed on the connecting ring, and the positioning sleeve is provided with a positioning piece capable of fixing the positioning sleeve on the anchor chain.

In the above-mentioned four-anchor positioning system for engineering ships, four connecting brackets are fixedly connected to the inner wall of the positioning sleeve in the circumferential direction, and guide wheels are rotatably connected to the connecting brackets, and the four guide wheels are evenly distributed in the circumferential direction. The anchor chain includes a transverse link and a longitudinal link, the transverse link and the longitudinal link are arranged at intervals, and the guide wheel abuts against the angle between the transverse link and the longitudinal link.

In the above-mentioned four-anchor positioning system for engineering ships, the positioning member includes a driving cylinder and a positioning pin, and a through hole is opened on the side wall of the positioning sleeve, and the positioning pin is slidably inserted into the through hole, and the driving The oil cylinder is fixedly connected to the positioning sleeve, and the piston rod of the driving cylinder is set along the radial direction of the positioning sleeve. One end of the positioning pin is fixedly connected to the end of the piston rod of the driving cylinder. Under the action of the driving cylinder, the positioning pin can Reach into the positioning sleeve and insert into the transverse link.

In the four-anchor positioning system of the above-mentioned engineering ship, the driving device includes a motor and a reducer, the reel is fixed at the lower end of the rotating shaft, and the rotating shaft is arranged at the lower end of the motor cabin, and the output shaft of the motor and the speed reducer The input shaft of the reducer is fixedly connected, and the output shaft of the reducer is fixedly connected with the upper end of the rotating shaft.

In the four-anchor positioning system of the above-mentioned engineering ship, the lifting mechanism includes two symmetrically arranged rack and pinion transmission mechanisms, and the rack and pinion transmission mechanism includes a rack, a driving gear and a hydraulic motor. On the outer wall of the positioning pile, the hydraulic motor is arranged in the power cabin, and the output shaft of the hydraulic motor is fixedly connected with a driving gear, and the driving gear and the rack are meshed for transmission.

In the above-mentioned four-anchor positioning system for engineering ships, the limiting mechanism includes two positioning bars, and two positioning slots are symmetrically arranged on the outer wall of the positioning pile, and the positioning slots are vertically arranged, and the two positioning bars The strips are arranged symmetrically on the inner wall of the positioning tube, and the two positioning strips are respectively placed in the two positioning grooves, and the positioning strips and the positioning grooves are in clearance fit.

In the four-anchor positioning system of the above-mentioned engineering ship, two sets of auxiliary lifting mechanisms are also rotated on the inner wall of the positioning tube. The two sets of auxiliary lifting mechanisms are symmetrically arranged and correspond to the positions of the two racks. Each set of auxiliary lifting mechanisms The lifting mechanism includes several driven gears arranged in rotation, and the driven gears are arranged in sequence from top to bottom and are all meshed with corresponding racks for transmission.

Compared with the existing technology, the four-anchor positioning system of the engineering ship has the following advantages:

1. Since the positioning sleeve is fixed on the anchor chain and away from the heave part, it has good positioning ability. The positioning pile does not need to be extended to the seabed. At the same time, the positioning sleeve positions the positioning pile through the chain rope, so that the four anchors The four positioning piles on the positioning device are subjected to approximately horizontal pulling forces in four different directions to position the hull, so the positioning is more stable and the working range is wider.

2. Since the positioning sleeve is guided by the guide wheel during the movement along the anchor chain, the clamping phenomenon of the positioning sleeve is avoided, and the movement of the positioning sleeve is smoother.

3. The structure of the lifting mechanism and the limit mechanism is simple, reliable and low in cost.

4. The present invention combines the advantages of leg positioning and anchor chain positioning, and has the characteristics of accurate and stable leg positioning and anti-interference. At the same time, it has the characteristics of easy adjustment of anchor chain positioning for moving ships and a large adjustable range of work.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a structural sectional view of the positioning sleeve.

Fig. 3 is a partial structure schematic diagram of the present invention

Fig. 4 is a sectional view of A-A in Fig. 3 .

Fig. 5 is a B-B sectional view in Fig. 3 .

Fig. 6 is an enlarged view of C in Fig. 1 .

In the figure, 1. Hull; 11. Power compartment; 111. Opening; 12. Positioning pipe; 13. Main deck; 14. Bottom outer plate; 2. Positioning pile; 21. Drum; 24, positioning groove; 3, windlass; 31, anchor chain; 311, transverse link; 312, longitudinal link; 32, anchor; 4, positioning sleeve; 41, connecting bracket; 42, guide wheel; 43 , through hole; 44, connecting ring; 5, traction piece; 51, winding machine; 52, traction rope; 6, positioning piece; 61, driving cylinder; 62, positioning pin; 7, motor compartment; 71, motor; 72 , reducer; 73, rotating shaft; 8, driving gear; 81, driven gear; 82, hydraulic motor; 9, positioning bar.

detailed description

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

As shown in Figures 1 to 6, a four-anchor positioning system of an engineering ship, the engineering ship includes a hull 1 and a chain locker arranged in the hull 1, the four-anchor positioning system includes four anchor positioning devices, The four anchoring devices are arranged symmetrically on both sides of the bow and both sides of the stern of the engineering ship, that is, one anchoring device is arranged on both sides of the bow of the engineering ship and are symmetrical to each other, and each of the two sides of the stern of the engineering ship An anchor positioning device is provided and is symmetrical to each other. The anchor positioning device includes a positioning pile 2, a windlass 3, an anchor 32, an anchor chain 31, a positioning tube 12 and a power cabin 11 arranged on the hull 1, and the positioning tube 12 is vertical The lower end of the positioning pipe 12 passes through the bottom outer plate 14 on the hull 1, and the upper end passes through the main deck 13 on the hull 1. The power cabin 11 is arranged on the main deck 13, and the upper end of the positioning pipe 12 and The power cabin 11 communicates, that is, the upper end of the positioning pipe 12 communicates with the main deck 13 and the communication is located in the power cabin 11, and the upper end of the power cabin 11 is provided with a circular opening 111, and the opening 111 and the positioning pipe 12 are the same. Shaft setting, the positioning pile 2 is vertically arranged in the positioning pipe 12, the upper end of the positioning pile 2 is inserted in the opening 111, the lower end is provided with a motor cabin 7, and the lower end of the motor cabin 7 is provided with a reel 21. The motor compartment 7 is provided with a driving device capable of driving the reel 21 to rotate in the circumferential direction, and the power compartment 11 is provided with a lifting mechanism capable of moving the positioning pile 2 up and down and a mechanism capable of preventing the positioning pile 2 from rotating in the circumferential direction. Position limiting mechanism, the windlass 3 is fixedly connected on the main deck 13 of the hull 1, one end of the anchor chain 31 is fixedly connected through the windlass 3 and the interior of the chain locker, and the other end is detachably connected with an anchor 32, so The anchor chain 31 is slidingly sleeved with a positioning sleeve 4, and the reel 21 is wound with a chain rope 22. One end of the chain rope 22 is fixedly connected to the reel 21, and the other end is fixedly connected to the positioning sleeve 4. , the hull 1 is provided with a traction member 5 that can drive the positioning sleeve 4 to move along the anchor chain 31, the traction member 5 includes a winding machine 51 and a traction rope 52, and the outer peripheral wall of the positioning sleeve 4 rotates Connected with a connecting ring 44, one end of the traction rope 52 is fixedly connected and wound on the winding drum of the winding machine 51, and the other end is fixed on the connecting ring 44, and the positioning sleeve 4 is provided with a The casing 4 is fixed to the positioning part 6 on the anchor chain 31 .

The working principle of the four-anchor positioning system of the engineering ship is as follows: four anchor positioning devices work at the same time. The reel 21 extends to the bottom of the sea. Unlike the general positioning pile 2, the positioning pile 2 of this embodiment does not need to be inserted into the bottom of the sea. When the reel 21 extends to the bottom of the sea, the traction rope 52 is released by the winding machine 51 to make the positioning casing 4. Under the action of gravity, it can descend along the anchor chain 31. When the positioning pile 2 moves downward, the driving device drives the reel 21 to rotate circumferentially so that the reel 21 releases the chain rope 22, and the casing 4 to be positioned passes over the anchor chain 31 After the heave part, the positioning sleeve 4 is fixed on the anchor chain 31 through the positioning piece 6. When the position of the reel 21 is flush with the positioning sleeve 4, the positioning pile 2 stops moving downward, and the chain rope 22 will be The positioning sleeve 4 is connected and positioned together with the reel 21 on the positioning pile 2, because the positioning sleeve 4 is fixed on the anchor chain 31 and is far away from the heave part, so it has better positioning ability. 22 applies force to the positioning piles 2, so that the four positioning piles 2 are subjected to approximately horizontal pulling forces in four different directions, thereby positioning the hull 1, the positioning is more stable, the working range is wider, and the anti-interference ability is strong.

In addition, in the anchored state, the driving device can also drive the reel 21 to rotate again to adjust the tension state of the chain rope 22, so as to realize the adjustment of the stress of the four positioning piles 2.

When it is necessary to move the hull 1, just make the positioning sleeve 4 out of the fixed state with the anchor chain 31, lift the positioning pile 2 and the positioning sleeve 4 upwards, and then control the corresponding anchor chain 31 to be retracted through the windlass 3 Just move the hull 1, and then repeat the above-mentioned actions for positioning after the movement is completed.

The winding machine 51 can drive the winding drum to rotate to release and retract the traction rope 52 , thereby pulling the positioning sleeve 4 and controlling the position of the positioning sleeve 4 relative to the anchor chain 31 .

The connecting ring 44 is rotatably connected to the peripheral wall of the positioning sleeve 4, so the positioning sleeve 4 can rotate on the peripheral wall of the positioning sleeve 4, and the use and adjustment are more flexible.

Specifically, four connecting brackets 41 are fixedly connected to the inner wall of the positioning sleeve 4 in the circumferential direction, and guide wheels 42 are rotatably connected to the connecting brackets 41, and the four guide wheels 42 are evenly distributed in the circumferential direction. 31 includes a transverse link 311 and a longitudinal link 312 , the transverse link 311 and the longitudinal link 312 are spaced apart, and the guide wheel 42 abuts against the angle between the transverse link 311 and the longitudinal link 312 .

The positioning sleeve 4 is guided by the guide wheel 42 during the movement along the anchor chain 31, so as to avoid the stagnation phenomenon of the positioning sleeve 4, and the movement of the positioning sleeve 4 is smoother.

Specifically, the positioning member 6 includes a driving cylinder 61 and a positioning pin 62. A through hole 43 is opened on the side wall of the positioning sleeve 4. The positioning pin 62 is slidably inserted into the through hole 43. The driving The oil cylinder 61 is fixedly connected on the positioning sleeve 4, and the piston rod of the driving cylinder 61 is arranged radially along the positioning sleeve 4, and one end of the positioning pin 62 is fixedly connected to the piston rod end of the driving cylinder 61. Under the action of 61 , the positioning pin 62 can extend into the positioning sleeve and be inserted into the transverse chain link 311 .

When the positioning sleeve 4 is moved into place, the piston rod of the drive cylinder 61 is stretched out, that is, the positioning pin 62 extends into the positioning sleeve 4 and is inserted into the transverse chain link 311, thereby fixing the positioning sleeve 4 on the anchor chain 31, The structure is simple, the driving oil cylinder 61 is connected with the hydraulic pump station through a hydraulic cylinder circuit, and the hydraulic pump station is controlled by a controller, and the controller is a computer.

Specifically, the driving device includes a motor 71 and a reducer 72, the reel 21 is fixed on the lower end of the rotating shaft 73, and the rotating shaft 73 is arranged at the lower end of the motor compartment 7, the output shaft of the motor 71 and the reduction gear The input shaft of the reducer 72 is fixedly connected, and the output shaft of the speed reducer 72 and the upper end of the rotating shaft 73 are fixedly connected.

The motor compartment 7 is a watertight compartment. There is a sealing device between the lower ends of the rotating shaft 73 and the motor compartment 7 to prevent water from entering the motor compartment 7. The motor 71 drives the reel 21 to rotate through the reducer 72. The structure is simple and the operation is reliable.

Specifically, the lifting mechanism includes two symmetrically arranged rack and pinion transmission mechanisms, the rack and pinion transmission mechanism includes a rack 23, a driving gear 8 and a hydraulic motor 82, and the rack 23 is arranged on the positioning pile 2 On the outer wall of the hydraulic motor 82, the hydraulic motor 82 is arranged in the power compartment 11, and the output shaft of the hydraulic motor 82 is fixedly connected with the driving gear 8, and the driving gear 8 and the rack 23 are meshed for transmission.

A rack 23 is set on the outer wall of the positioning pile 2, and the hydraulic motor 82 is connected to the hydraulic pump station through a hydraulic pipe. The hydraulic pump station is controlled by a controller, and the controller is a computer. The hydraulic motor 82 should be able to forward and reverse , so the positive rotation and reverse rotation of the driving gear 8 can be realized, so that the up and down movement of the positioning pile 2 can be realized through the meshing transmission with the rack 23. The purpose of the symmetrical arrangement of the two rack and pinion transmission mechanisms is for the up and down movement of the positioning pile 2 During the process, the force is balanced, so as to achieve stable and reliable movement.

Specifically, the position-limiting mechanism includes two positioning bars 9, two positioning grooves 24 are symmetrically arranged on the outer wall of the positioning pile 2, the positioning grooves 24 are vertically arranged, and the two positioning bars 9 are symmetrical. Set on the inner wall of the positioning tube 12, the two positioning strips 9 are respectively placed in the two positioning grooves 24, and the clearance fit between the positioning strips 9 and the positioning grooves 24, specifically, the depth direction of the positioning grooves 24 It is consistent with the radial direction of the positioning pile 2.

The cooperation of the positioning bar 9 and the positioning groove 24 can prevent the positioning pile 2 from rotating in the circumferential direction. Specifically, the cross section of the positioning bar 9 is rectangular, and positioning rollers can be set between the positioning bar 9 and the positioning groove 24. Roller rotation is arranged on the locating bar 9, and described locating roller low pressure is in locating groove 24, and locating roller can reduce frictional force, alleviates the working burden of hydraulic motor 82.

Specifically, on the inner wall of the positioning tube 12, two groups of auxiliary lifting mechanisms are also rotated, and the two groups of auxiliary lifting mechanisms are symmetrically arranged and correspond to the positions of the two racks 23. Each group of auxiliary lifting mechanisms includes several A driven gear 81 is rotated, and the driven gears 81 are sequentially arranged from top to bottom and are all meshed with the corresponding rack 23 for transmission.

The effect of two groups of auxiliary lifting mechanisms is to make the positioning tube 12 more stable and reliable during the up and down movement.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (7)

1. A four-anchor positioning system of an engineering ship, said engineering ship comprising a hull (1) and a chain locker arranged in the hull (1), said four-anchor positioning system comprising four anchor positioning devices, four anchors The positioning devices are arranged symmetrically on both sides of the bow and both sides of the stern of the engineering ship, and the anchor positioning devices include positioning piles (2), windlasses (3), anchors (32), anchor chains (31), and are arranged on The positioning tube (12) and the power cabin (11) on the hull (1), the positioning tube (12) is vertically arranged, and the lower end of the positioning tube (12) passes through the bottom outer plate (14) on the hull (1) ), the upper end runs through the main deck (13) on the hull (1), the power cabin (11) is arranged on the main deck (13), and the upper end of the positioning pipe (12) communicates with the power cabin (11), so The upper end of the power cabin (11) is provided with a circular opening (111), the opening (111) and the positioning tube (12) are coaxially arranged, and the positioning pile (2) is vertically arranged on the positioning tube (12) Among them, the upper end of the positioning pile (2) is inserted in the opening (111), the lower end is provided with a motor cabin (7), and the lower end of the motor cabin (7) is rotatably provided with a reel (21). A driving device capable of driving the reel (21) to rotate in the circumferential direction is provided in the nacelle (7), and a lifting mechanism capable of moving the positioning pile (2) up and down and a lifting mechanism capable of preventing the positioning pile (2) from moving in the power cabin (11) are provided. ) limit mechanism for circumferential rotation, the windlass (3) is fixedly connected on the main deck (13) of the hull (1), and one end of the anchor chain (31) passes through the windlass (3) and the chain locker The other end is detachably connected with an anchor (32), the anchor chain (31) is slidingly sleeved with a positioning sleeve (4), and the reel (21) is wound with a chain rope (22 ), one end of the chain rope (22) is fixedly connected to the reel (21), and the other end is fixedly connected to the positioning sleeve (4). The traction part (5) that the anchor chain (31) moves, and the traction part (5) includes a winder (51) and a traction rope (52), and the outer peripheral wall of the positioning sleeve (4) is rotatably connected with a connection Ring (44), one end of the traction rope (52) is fixedly connected and wound on the winding drum of the winding machine (51), and the other end is fixed on the connecting ring (44), and the positioning sleeve (4 ) is provided with a positioning piece (6) capable of fixing the positioning sleeve (4) on the anchor chain (31). 2. The four-anchor positioning system of an engineering ship according to claim 1, wherein four connecting brackets (41) are fixedly connected to the inner wall of the positioning sleeve (4) in the circumferential direction, and the connecting brackets (41 ) are rotatably connected with guide wheels (42), the four guide wheels (42) are evenly distributed in the circumferential direction, and the anchor chain (31) includes a transverse link (311) and a longitudinal link (312), and the transverse link (311) is spaced apart from the longitudinal chain link (312), and the guide wheel (42) abuts against the angle between the transverse chain link (311) and the longitudinal chain link (312). 3. The four-anchor positioning system of the engineering ship according to claim 2, characterized in that, the positioning member (6) comprises a driving cylinder (61) and a positioning pin (62), and the positioning sleeve (4) A through hole (43) is opened on the side wall, and the above-mentioned positioning pin (62) is slidably inserted in the through hole (43). The driving cylinder (61) is fixedly connected to the positioning sleeve (4), and the driving cylinder ( The piston rod of 61) is set along the radial direction of the positioning sleeve (4), and one end of the positioning pin (62) is fixedly connected to the end of the piston rod of the driving cylinder (61), and is positioned under the action of the driving cylinder (61). The pin (62) can extend into the positioning sleeve and be inserted into the transverse chain link (311). 4. The four-anchor positioning system of an engineering ship according to any one of claims 1 to 3, characterized in that, the drive device includes a motor (71), a reducer (72), and the reel (21) Fixed on the lower end of the rotating shaft (73), the rotating shaft (73) is installed on the lower end of the motor compartment (7), the output shaft of the motor (71) is fixedly connected with the input shaft of the speed reducer (72), and the speed reducer The output shaft of device (72) is fixedly connected with the upper end of rotating shaft (73). 5. The four-anchor positioning system of an engineering ship according to claim 4, wherein the elevating mechanism comprises two symmetrically arranged rack-and-pinion transmission mechanisms, and the rack-and-pinion transmission mechanism comprises a rack (23) , driving gear (8) and hydraulic motor (82), the rack (23) is arranged on the outer wall of the spud (2), the hydraulic motor (82) is arranged in the power cabin (11), the hydraulic pressure The output shafts of the motors (82) are all fixedly connected with driving gears (8), and the driving gears (8) and racks (23) are meshed for transmission. 6. The four-anchor positioning system of an engineering ship according to claim 5, wherein the position-limiting mechanism includes two positioning bars (9), and two positioning bars (9) are symmetrically arranged on the outer wall of the positioning pile (2). Positioning groove (24), described positioning groove (24) is vertically arranged, and two described positioning strips (9) are symmetrically arranged on the inner wall of positioning tube (12), and two described positioning strips (9) are respectively in In the two positioning grooves (24), the positioning bar (9) and the positioning groove (24) are clearance fit. 7. The four-anchor positioning system of an engineering ship according to claim 6, characterized in that, on the inner wall of the positioning pipe (12), two groups of auxiliary lifting mechanisms are also rotated, and the two groups of auxiliary lifting mechanisms are arranged symmetrically and Corresponding to the positions of the two racks (23), each group of auxiliary lifting mechanisms includes several driven gears (81) arranged in rotation, and the several driven gears (81) are arranged in sequence from top to bottom and are all Engage transmission with corresponding rack (23).