Auxiliary lineation and trepanning device for bow outer plate anchor chain pipe and using method of auxiliary lineation and trepanning device

Abstract

The invention relates to the technical field of hawse pipe marking and trepanning, in particular to a bow shell plate hawse pipe auxiliary marking and trepanning device which comprises a steel needle body, the steel needle body is sleeved with a limiting mechanism facilitating limiting of the steel needle body, and the steel needle body is slidably provided with a marking mechanism facilitating marking of a bow shell plate hawse pipe. The steel needle body is provided with an attaching mechanism which is convenient for pushing the marking mechanism to be attached to the ship bow outer plate all the time, the steel needle body is sleeved with the sleeve in a sliding mode, the graduated scale is fixedly connected to the side wall of the sleeve, the limiting groove is formed in the front face of the graduated scale, and the anti-disengaging cap is fixedly connected to the outer end of the graduated scale. According to the auxiliary lineation and trepanning device for the ship bow outer plate hawse pipe, the sleeve and the graduated scale are arranged on the steel needle body in a sleeving mode, the bottom end of the sliding sleeve sliding on the graduated scale is connected with the lineation needle, and the sliding sleeve is controlled and locked by the fourth locking bolt at the top end, so that the lineation and trepanning size of the hawse pipe can be adjusted conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of marking and opening holes for anchor chain pipes, in particular to an auxiliary marking and opening device for anchor chain pipes on a bow outer plate. Background Art

[0002] The anchor chain pipe is a tubular device on a ship used to guide the anchor chain in and out of the anchor chain locker. It is usually a tubular structure welded from steel plates and can be arranged vertically or inclined depending on the location.

[0003] The prior art does not have a structure for auxiliary marking of anchor chain pipe holes when in use, so that the holes for the bow anchor chain pipes of bulk carriers and small oil tankers are usually opened with templates. The template needs to be individually laid out and produced according to the ship type and the size of the anchor chain pipe, and generally ship companies generally use wooden templates. The wooden templates are large in size and have a certain weight. The actual on-site hole opening process generally requires more than two people to cooperate in the operation. One person holds the template to align with the reference line, and the other person marks according to the outline of the template. During the marking process, it is required that the template and the reference line cannot be shifted, and because the size of the template is large, multiple sections of marking are required, which is time-consuming and affects the work efficiency of the personnel. Based on the deficiencies of the prior art, the present invention designs an auxiliary marking and hole opening device for the bow outer plate anchor chain pipe. Summary of the invention

[0004] The invention provides an auxiliary marking and hole opening device for an anchor chain pipe on a bow outer plate, which has the advantage of rapid auxiliary marking of an anchor chain pipe.

[0005] The present invention provides the following technical solution: an auxiliary marking and hole-opening device for a bow outer plate anchor chain pipe, comprising a steel needle body, a limiting mechanism for facilitating the limiting of the steel needle body is sleeved on the steel needle body, a marking mechanism for facilitating marking of the bow outer plate anchor chain pipe is slidably arranged on the steel needle body, and a fitting mechanism for facilitating pushing the marking mechanism to always fit with the bow outer plate is arranged on the steel needle body;

[0006] The marking mechanism comprises a sleeve, a scale, a limit groove, an anti-drop cap, a sliding sleeve, a limit slider, a fourth locking bolt, a scale window, an indicator mark and a marking needle. The sleeve is slidably sleeved on the steel needle body, the scale is fixedly connected to the side wall of the sleeve, the limit groove is arranged on the front side of the scale, the anti-drop cap is fixedly connected to the outer end of the scale, the sliding sleeve is slidably sleeved on the scale, the limit slider is fixedly connected to the inner wall of the sliding sleeve, the fourth locking bolt is threadedly connected to the top end of the sliding sleeve, the scale window is arranged on the front side of the sliding sleeve, the indicator mark is fixedly connected to the front side of the sliding sleeve, and the marking needle is fixedly connected to the lower surface of the sliding sleeve.

[0007] As a preferred technical solution of the present invention, the limiting mechanism includes a first limiting cover, a second limiting cover, a first connecting screw, a movable inner groove, a first locking bolt, a second locking bolt, an arc movable head, a positioning seat, a bottom groove and a magnetic seat. The first limiting cover is sleeved on the steel needle body, the second limiting cover is arranged on one side of the first limiting cover, the first connecting screw is threadedly connected to the first limiting cover and the second limiting cover, the movable inner groove is opened inside the first limiting cover and the second limiting cover, the first locking bolt is threadedly connected to the side wall of the first limiting cover, the second locking bolt is threadedly connected to the side wall of the second limiting cover, the arc movable head is rotatably connected to the inside of the movable inner groove, the positioning seat is fixedly connected to the bottom of the arc movable head, the bottom groove is opened at the bottom of the positioning seat, the magnetic seat is fixedly connected to the inside of the bottom groove, and the fixing screw is threadedly connected to the magnetic seat.

[0008] As a preferred technical solution of the present invention, the fitting mechanism includes a bottom push plate, a positioning block, a top push plate, a third locking bolt and a spring. The bottom push plate is fixedly connected to the upper surface of the sleeve, the positioning block is sleeved on the steel needle body above the sleeve, the top push plate is fixedly connected to the lower surface of the positioning block, the third locking bolt is threaded through the side wall of the positioning block, and the spring is fixedly connected between the bottom push plate and the top push plate.

[0009] As a preferred technical solution of the present invention, the limit slider is slidably connected to the inside of the limit groove, and the inner end of the fourth locking bolt is in contact with the upper surface of the scale.

[0010] As a preferred technical solution of the present invention, the scale window is slidably connected to the outside of the scale line of the scale, and the indicator mark is arranged below the scale window.

[0011] As a preferred technical solution of the present invention, the arc movable head and the positioning seat are movably sleeved on the steel needle body, the inner end of the first locking bolt contacts the arc movable head, and the inner end of the second locking bolt contacts the side wall of the steel needle body.

[0012] As a preferred technical solution of the present invention, the top end of the fixing screw is threadedly connected to the top of the inner cavity of the bottom groove, and the magnetic seat is sleeved on the steel needle body.

[0013] As a preferred technical solution of the present invention, the inner end of the third locking bolt contacts the side wall of the steel needle body.

[0014] As a preferred technical solution of the present invention, the spring sleeve is arranged on the steel needle body.

[0015] The method for using the auxiliary marking and hole opening device for the bow outer plate anchor chain pipe comprises the following steps:

[0016] S1: First, a hole with a diameter equal to that of the steel needle body is opened on the bow outer plate, and the steel needle body is passed through the bow outer plate, so that the tip of the steel needle body is against the center point of the circular hole on the deck, and then the limiting mechanism is slid on the steel needle body so that it is magnetically attracted to the bow outer plate to fix the steel needle body;

[0017] S2: Then, the sleeve, the scale and the fitting mechanism are sleeved on the steel needle body, and the corresponding scales of the sliding sleeve and the marking needle on the scale are adjusted according to the diameter of the anchor chain pipe;

[0018] S3: Finally, the tip of the marking needle is brought into contact with the bow outer plate and the positioning block and the push plate are pressed down to compress the spring to lock the third locking bolt. After locking, the scale and sleeve are rotated 360° to mark the bow outer plate with the marking needle. During this period, the fitting mechanism pushes the sleeve according to the outer plate line to drive the tip of the marking needle to always fit the bow outer plate for marking.

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

[0020] 1. The auxiliary marking and hole-opening device for the anchor chain pipe of the bow outer plate of the ship comprises the following steps: after the steel needle body is fixed according to the preset setting, the sleeve, the scale and the fitting mechanism are inserted from the outer end of the steel needle body through the sleeve, and the tip of the marking needle is in contact with the bow outer plate. Then, the fourth locking bolt is loosened so that the inner end thereof does not contact with the scale and the locking of the sliding sleeve is released. At this time, the sliding sleeve is adjusted left and right according to the required radius length of the anchor chain pipe hole, until the corresponding scale value on the scale is observed from the scale window provided on the sliding sleeve and the indicator also points to the value, the marking needle can be adjusted, the fourth locking bolt is tightened to lock the positions of the sliding sleeve and the marking needle, and then the third locking bolt is loosened to press the positioning block downward for a certain distance so that the positioning block pushes the push plate to compress the spring, and then the third locking bolt is tightened. Finally, the sleeve and the scale are moved to drive the marking needle to rotate 360 ​​degrees, so that the tip of the marking needle is always in contact with the bow outer plate under the push of the spring and rotates to mark. The device is convenient for marking and hole-opening anchor chain pipes on the bow outer plate of the ship.

[0021] 2. The auxiliary marking and hole-opening device for the anchor chain pipe of the bow outer plate of the ship is provided by firstly opening a hole equal to the diameter of the steel needle body on the bow outer plate, and passing the steel needle body through the bow outer plate so that the tip of the steel needle body is against the center point of the circular hole on the deck, and then loosening the first locking bolt and the second locking bolt and sleeve the first limiting cover, the second limiting cover, the circular arc movable head, the positioning seat and the magnetic seat on the steel needle body. At this time, the first limiting cover, the second limiting cover, the circular arc movable head and the positioning seat are moved to make the magnetic seat slowly move close to the bow outer plate. In this process, according to the relationship between the steel needle body and the positioning seat, the magnetic seat is moved to the steel needle body and the positioning seat. The angle of the bow outer plate is adjusted by rotating the arc movable head and the movable inner groove to adjust the angle of the positioning seat so that it remains roughly flush with the bow outer plate until the magnetic seat moves to fit with the bow outer plate. Finally, the first locking bolt is turned to make its inner end contact with the arc movable head to fix the angles of the first limit cover, the second limit cover, the arc movable head and the positioning seat. At the same time, the second locking bolt is turned to make its inner end contact with the steel needle body to lock the steel needle body with the first limit cover and the second limit cover to complete the fixation. This device is convenient for fixing the steel needle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a rear view structural diagram of the main body of the hole-opening and marking device of the present invention;

[0024] Figure 3 This is a schematic diagram of the explosion structure of the limiting mechanism of the present invention;

[0025] Figure 4 This is a schematic diagram of the explosion structure of the limiting mechanism of the present invention when viewed from above;

[0026] Figure 5 It is a schematic diagram of the exploded structure of the scribing mechanism of the present invention;

[0027] Figure 6 It is a schematic diagram of the connection structure between the scribing mechanism and the laminating mechanism of the present invention.

[0028] In the figure: 1. steel needle body; 2. limiting mechanism; 201. first limiting cover; 202. second limiting cover; 203. first connecting screw; 204. movable inner groove; 205. first locking bolt; 206. second locking bolt; 207. arc movable head; 208. positioning seat; 209. bottom groove; 210. magnetic seat; 211. fixing screw; 3. fitting mechanism; 301. bottom push plate; 302. positioning block; 303. top push plate; 304. third locking bolt; 305. spring; 4. marking mechanism; 401. sleeve; 402. scale; 403. limiting groove; 404. anti-drop cap; 405. sliding sleeve; 406. limiting slider; 407. fourth locking bolt; 408. scale window; 409. indicator mark; 410. marking needle. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-6 The auxiliary marking and hole-opening device for the anchor chain pipe of the bow outer plate comprises a steel needle body 1, a limiting mechanism 2 is sleeved on the steel needle body 1 for facilitating the limiting of the steel needle body 1, a marking mechanism 4 is slidably arranged on the steel needle body 1 for facilitating the marking of the anchor chain pipe of the bow outer plate, and a fitting mechanism 3 is arranged on the steel needle body 1 for facilitating pushing the marking mechanism 4 to always fit with the bow outer plate.

[0031] See also Figure 5-6 , the marking mechanism 4 includes a sleeve 401, a scale 402, a limit groove 403, an anti-drop cap 404, a sleeve 405, a limit slider 406, a fourth locking bolt 407, a scale window 408, an indicator 409 and a marking needle 410. The sleeve 401 is slidably sleeved on the steel needle body 1, the scale 402 is fixedly connected to the side wall of the sleeve 401, the limit groove 403 is arranged on the front side of the scale 402, the anti-drop cap 404 is fixedly connected to the outer end of the scale 402, the sleeve 405 is slidably sleeved on the scale 402, and the limit slider 406 is fixedly connected to the outer end of the scale 402. The fourth locking bolt 407 is threadedly connected to the inner wall of the sliding sleeve 405, the scale window 408 is opened on the front of the sliding sleeve 405, the indicator mark 409 is fixedly connected to the front of the sliding sleeve 405, the marking needle 410 is fixedly connected to the lower surface of the sliding sleeve 405, the limit slider 406 is slidably connected to the inside of the limit groove 403, the inner end of the fourth locking bolt 407 is in contact with the upper surface of the scale 402, the scale window 408 is slidably connected to the outside of the scale line of the scale 402, and the indicator mark 409 is arranged below the scale window 408.

[0032] By setting the sleeve 401, the scale 402, the sliding sleeve 405 and the marking needle 410, the marking needle 410 can be rotated on the steel needle body 1 to rotate and mark the bow outer plate. By setting the scale window 408 and the indicator mark 409, the positions of the sliding sleeve 405 and the marking needle 410 on the scale 402 can be adjusted according to the radius size of the opening. By setting the fourth locking bolt 407, the positions of the sliding sleeve 405 and the marking needle 410 after adjustment can be locked. By setting the limiting groove 403 and the limiting slider 406, the stability of the sliding sleeve 405 during sliding adjustment and marking can be improved.

[0033] See also Figure 3-4 The limiting mechanism 2 includes a first limiting cover 201, a second limiting cover 202, a first connecting screw 203, a movable inner groove 204, a first locking bolt 205, a second locking bolt 206, an arc movable head 207, a positioning seat 208, a bottom groove 209 and a magnetic seat 210. The first limiting cover 201 is sleeved on the steel needle body 1, and the second limiting cover 202 is arranged on one side of the first limiting cover 201. The first connecting screw 203 is threadedly connected to the first limiting cover 201 and the second limiting cover 202. The movable inner groove 204 is opened inside the first limiting cover 201 and the second limiting cover 202. The first locking bolt 205 is threadedly connected to the side wall of the first limiting cover 201, and the second locking bolt 206 is threadedly connected to the side wall of the first limiting cover 201. Connected to the side wall of the second limiting cover 202, the arc movable head 207 is rotatably connected to the inside of the movable inner groove 204, the positioning seat 208 is fixedly connected to the bottom of the arc movable head 207, the bottom groove 209 is opened at the bottom of the positioning seat 208, the magnetic seat 210 is fixedly connected to the inside of the bottom groove 209, the fixing screw 211 is connected to the magnetic seat 210, the arc movable head 207 and the positioning seat 208 are movably sleeved on the steel needle body 1, the inner end of the first locking bolt 205 contacts the arc movable head 207, the inner end of the second locking bolt 206 contacts the side wall of the steel needle body 1, the top end of the fixing screw 211 is threadedly connected to the top of the inner cavity of the bottom groove 209, and the magnetic seat 210 is sleeved on the steel needle body 1.

[0034] By setting the first limiting cover 201 and the second limiting cover 202, and the second limiting cover 202 is provided with a second locking bolt 206, so as to facilitate the connection and fixation of the steel needle body 1 with the first limiting cover 201 and the second limiting cover 202. By setting the movable inner groove 204, the arc movable head 207, the positioning seat 208 and the magnetic seat 210, after the steel needle body 1 is inserted into the opening of the bow outer plate, the magnetic seat 210 can rotate at multiple angles under the action of the arc movable head 207 and the movable inner groove 204 to fit with the bow outer plate to assist the first limiting cover 201 and the second limiting cover 202 to limit and fix the steel needle body 1.

[0035] See also Figure 6 The fitting mechanism 3 includes a bottom push plate 301, a positioning block 302, a top push plate 303, a third locking bolt 304 and a spring 305. The bottom push plate 301 is fixedly connected to the upper surface of the sleeve 401, the positioning block 302 is sleeved on the steel needle body 1 above the sleeve 401, the top push plate 303 is fixedly connected to the lower surface of the positioning block 302, the third locking bolt 304 is threaded through the side wall of the positioning block 302, the spring 305 is fixedly connected between the bottom push plate 301 and the top push plate 303, the inner end of the third locking bolt 304 is in contact with the side wall of the steel needle body 1, and the spring 305 is sleeved on the steel needle body 1.

[0036] By providing a bottom push plate 301, a top push plate 303 and a spring 305, the marking mechanism 4 can be pushed downward so that the tip of the marking needle 410 can always be in contact with the bow outer plate for marking operations. By providing a positioning block 302 and a third locking bolt 304, the compression of the spring 305 can be adjusted according to the position of the marking mechanism 4 to prevent the spring 305 from being unable to push the bottom push plate 301 due to a large curvature, causing the marking mechanism 4 to move downward to fit the marking.

[0037] See also Figure 1-6 The method for using the auxiliary marking and hole opening device for the bow outer plate anchor chain pipe comprises the following steps:

[0038] S1: First, a hole with a diameter equal to that of the steel needle body 1 is opened on the bow outer plate, and the steel needle body 1 is passed through the bow outer plate, so that the tip of the steel needle body 1 is against the center point of the circular hole on the deck, and then the limiting mechanism 2 is slid on the steel needle body 1 so that it is magnetically attracted to the bow outer plate to fix the steel needle body 1;

[0039] S2: Then the sleeve 401, the scale 402 and the fitting mechanism 3 are sleeved on the steel needle body 1, and the corresponding scales of the sliding sleeve 405 and the marking needle 410 on the scale 402 are adjusted according to the diameter of the anchor chain pipe;

[0040] S3: Finally, the tip of the marking needle 410 is brought into contact with the bow outer plate and the positioning block 302 and the push plate 303 are pressed down to compress the spring 305 and lock the third locking bolt 304. After locking, the scale 402 and the sleeve 401 are rotated 360° to mark the bow outer plate with the marking needle 410. During this period, the fitting mechanism 3 pushes the sleeve 401 according to the outer plate line to drive the tip of the marking needle 410 to always fit and mark the bow outer plate.

[0041] Working principle: when the auxiliary marking and hole opening device for the bow outer plate anchor chain pipe is used, in the initial state, the sleeve 401 and the scale 402 are sleeved on the steel needle body 1, and the bottom end of the sliding sleeve 405 sliding on the scale 402 is connected with the marking needle 410, and the sliding sleeve 405 is locked by the fourth locking bolt 407 at the top, so as to adjust the marking hole size of the anchor chain pipe, and the first limit cover 201 and the second limit cover 202 sleeved on the steel needle body 1 are connected by the first connecting screw 203, and the first limit cover 201 and the second limit cover 202 are connected. An arc movable head 207 is arranged in the movable inner groove 204 opened in the cover 202, a positioning seat 208 is arranged at the bottom of the arc movable head 207, and a magnetic seat 210 is installed inside the positioning seat 208, so as to limit the steel needle body 1, and at the same time, the top of the sleeve 401 is fixedly connected to the bottom push plate 301 and connected to the top push plate 303 through the spring 305, and a positioning block 302 and a third locking bolt 304 are arranged on the upper surface of the top push plate 303, so as to push the marking mechanism 4 downward so that the marking needle 410 is always in contact with the bow outer plate and marks;

[0042] When it is necessary to mark and drill a hole for the anchor chain pipe on the bow outer plate, first, after the steel needle body 1 is fixed as preset, the sleeve 401, the scale 402 and the fitting mechanism 3 are inserted from the outer end of the steel needle body 1 and the tip of the marking needle 410 is brought into contact with the bow outer plate. Then, the fourth locking bolt 407 is loosened so that its inner end is not in contact with the scale 402 to release the lock on the sleeve 405. At this time, the sleeve 405 is adjusted left and right according to the required radius length of the anchor chain pipe hole until the corresponding scale value on the scale 402 is observed from the scale window 408 opened on the sleeve 405 and the indicator 409 also points to the number. When the value is reached, the marking needle 410 can complete the adjustment and tighten the fourth locking bolt 407 to lock the position of the sliding sleeve 405 and the marking needle 410, then loosen the third locking bolt 304 to press the positioning block 302 downward for a certain distance so that the positioning block 302 pushes the push plate 303 to compress the spring 305 and then tighten the third locking bolt 304, finally, move the sleeve 401 and the scale 402 to drive the marking needle 410 to rotate 360°, so that the tip of the marking needle 410 is always in contact with the bow outer plate under the push of the spring 305 and rotates to mark. The device is convenient for marking and opening holes for the anchor chain pipe on the bow outer plate.

[0043] When it is necessary to fix the steel needle body 1, first open a hole with the same diameter as the steel needle body 1 on the bow outer plate, and pass the steel needle body 1 through the bow outer plate so that the tip of the steel needle body 1 is against the center point of the circular hole on the deck, then loosen the first locking bolt 205 and the second locking bolt 206 and sleeve the first limiting cover 201, the second limiting cover 202, the arc movable head 207, the positioning seat 208 and the magnetic seat 210 on the steel needle body 1. At this time, move the first limiting cover 201, the second limiting cover 202, the arc movable head 207 and the positioning seat 208 to make the magnetic seat 210 slowly move close to the bow outer plate. In this process, according to the alignment of the steel needle body 1 with the bow outer plate, the steel needle body 1 is fixed to the bow outer plate. The angle of the plate is adjusted by rotating the positioning seat 208 using the arc movable head 207 and the movable inner groove 204 to keep it roughly flush with the bow outer plate until the magnetic seat 210 moves to fit with the bow outer plate, and finally the first locking bolt 205 is turned to make its inner end contact with the arc movable head 207 to fix the angles of the first limit cover 201, the second limit cover 202, the arc movable head 207 and the positioning seat 208. At the same time, the second locking bolt 206 is turned to make its inner end contact with the steel needle body 1 to lock the steel needle body 1 with the first limit cover 201 and the second limit cover 202 to complete the fixation. This device is convenient for fixing the steel needle body 1.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary marking and hole-opening device for a bow outer plate anchor chain pipe, comprising a steel needle body (1), characterized in that: The steel needle body (1) is sleeved with a limiting mechanism (2) for limiting the position of the steel needle body (1), the steel needle body (1) is slidably provided with a marking mechanism (4) for marking the anchor chain pipe of the bow outer plate, and the steel needle body (1) is provided with a fitting mechanism (3) for pushing the marking mechanism (4) to always fit with the bow outer plate; The marking mechanism (4) comprises a sleeve (401), a scale (402), a limiting groove (403), an anti-drop cap (404), a sliding sleeve (405), a limiting slider (406), a fourth locking bolt (407), a scale window (408), an indicator (409) and a marking needle (410), wherein the sleeve (401) is slidably sleeved on the steel needle body (1), the scale (402) is fixedly connected to the side wall of the sleeve (401), and the limiting groove (403) is arranged on the front side of the scale (402). The anti-drop cap (404) is fixedly connected to the outer end of the scale (402), the sliding sleeve (405) is slidably sleeved on the scale (402), the limiting slider (406) is fixedly connected to the inner wall of the sliding sleeve (405), the fourth locking bolt (407) is threadedly connected to the top of the sliding sleeve (405), the scale window (408) is opened on the front of the sliding sleeve (405), the indicator mark (409) is fixedly connected to the front of the sliding sleeve (405), and the marking needle (410) is fixedly connected to the lower surface of the sliding sleeve (405).

2. The auxiliary marking and hole opening device for the bow outer plate anchor chain pipe according to claim 1, characterized in that: The limiting mechanism (2) comprises a first limiting cover (201), a second limiting cover (202), a first connecting screw (203), a movable inner groove (204), a first locking bolt (205), a second locking bolt (206), an arc movable head (207), a positioning seat (208), a bottom groove (209), a magnetic seat (210) and a fixing screw (211), wherein the first limiting cover (201) is sleeved on the steel needle body (1), the second limiting cover (202) is arranged on one side of the first limiting cover (201), the first connecting screw (203) is threadedly connected to the first limiting cover (201) and the second limiting cover (202), and the movable inner groove (204) is provided with a plurality of locking screws (205), a plurality of locking screws (206), a plurality of locking screws (207 ... ) are provided inside the first limiting cover (201) and the second limiting cover (202), the first locking bolt (205) is threadedly connected to the side wall of the first limiting cover (201), the second locking bolt (206) is threadedly connected to the side wall of the second limiting cover (202), the arc movable head (207) is rotatably connected to the inside of the movable inner groove (204), the positioning seat (208) is fixedly connected to the bottom of the arc movable head (207), the bottom groove (209) is provided at the bottom of the positioning seat (208), the magnetic seat (210) is fixedly connected to the inside of the bottom groove (209), and the fixing screw (211) is threadedly connected to the magnetic seat (210).

3. The auxiliary marking and hole opening device for the bow outer plate anchor chain pipe according to claim 1, characterized in that: The fitting mechanism (3) includes a bottom push plate (301), a positioning block (302), a top push plate (303), a third locking bolt (304) and a spring (305); the bottom push plate (301) is fixedly connected to the upper surface of the sleeve (401); the positioning block (302) is sleeved on the steel needle body (1) above the sleeve (401); the top push plate (303) is fixedly connected to the lower surface of the positioning block (302); the third locking bolt (304) is threadedly connected to the side wall of the positioning block (302); and the spring (305) is fixedly connected between the bottom push plate (301) and the top push plate (303).

4. The auxiliary marking and hole opening device for the bow outer plate anchor chain pipe according to claim 1, characterized in that: The limiting slider (406) is slidably connected inside the limiting groove (403), and the inner end of the fourth locking bolt (407) is in contact with the upper surface of the scale (402).

5. The auxiliary marking and hole opening device for the bow outer plate anchor chain pipe according to claim 1, characterized in that: The scale window (408) is slidably connected to the outside of the scale line of the scale ruler (402), and the indicator (409) is arranged below the scale window (408).

6. The auxiliary marking and hole opening device for the bow outer plate anchor chain pipe according to claim 2, characterized in that: The arc movable head (207) and the positioning seat (208) are movably sleeved on the steel needle body (1), the inner end of the first locking bolt (205) is in contact with the arc movable head (207), and the inner end of the second locking bolt (206) is in contact with the side wall of the steel needle body (1).

7. The auxiliary marking and hole opening device for the bow outer plate anchor chain pipe according to claim 2, characterized in that: The top end of the fixing screw (211) is threadedly connected to the top of the inner cavity of the bottom groove (209), and the magnetic seat (210) is sleeved and arranged on the steel needle body (1).

8. The auxiliary marking and hole opening device for the bow outer plate anchor chain pipe according to claim 3, characterized in that: The inner end of the third locking bolt (304) contacts the side wall of the steel needle body (1).

9. The auxiliary marking and hole opening device for the bow outer plate anchor chain pipe according to claim 3, characterized in that: The spring (305) is sleeved and arranged on the steel needle body (1).

10. The method for using the auxiliary marking and hole opening device for the bow outer plate anchor chain pipe is characterized in that: The following steps are involved: S1: First, a hole with a diameter equal to that of the steel needle body (1) is opened on the bow outer plate, and the steel needle body (1) is passed through the bow outer plate, so that the tip of the steel needle body (1) is against the center point of the circular hole on the deck, and then the limiting mechanism (2) is slid onto the steel needle body (1) so that it is magnetically attracted to the bow outer plate to fix the steel needle body (1); S2: Then the sleeve (401), the scale (402) and the fitting mechanism (3) are sleeved on the steel needle body (1), and the corresponding scales of the sliding sleeve (405) and the marking needle (410) on the scale (402) are adjusted according to the diameter of the anchor chain pipe; S3: Finally, the tip of the marking needle (410) is brought into contact with the bow outer plate and the positioning block (302) and the push plate (303) are pressed down to compress the spring (305) and lock the third locking bolt (304). After locking, the scale (402) and the sleeve (401) are rotated 360 degrees to mark the bow outer plate with the marking needle (410). During this period, the fitting mechanism (3) pushes the sleeve (401) according to the outer plate line to drive the tip of the marking needle (410) to always fit with the bow outer plate to mark the line.

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