Device for improving under-point centering precision

Abstract

The utility model relates to the technical field of plumb bob tools, in particular to a device for improving under-point centering precision, which comprises a plumb bob main body, a thread mounting groove is formed in the bottom end of the plumb bob main body; a vertical tip seat is mounted in the threaded mounting groove in a threaded manner; a ball groove is formed in the bottom of the vertical tip seat; a ball head vertical tip is arranged in the ball groove; the top of the ball head vertical tip is a ball head, the bottom of the ball head vertical tip is a vertical tip, and the ball head of the ball head vertical tip can like the ball groove to rotate, so that the tip end of the bottom of the ball head vertical tip always faces the direction of the earth gravity line; after the plumb bob main body deflects due to the change of the gravity center line caused by corrosion and damage, the ball head plumb tip can be freely rotated and adjusted, so that the bottom tip end of the ball head plumb tip still faces the direction of the earth gravity line, the centering accuracy is improved, and the measurement precision is further improved.

Description

Technical Field

[0001] This utility model relates to the field of plumb bob tool technology, specifically a device for improving the centering accuracy of a point. Background Technology

[0002] A plumb bob is usually made of metal and is a cone-shaped object that is wider at the top and narrower at the bottom. It is a simple and common vertical measuring tool used in measurement work. When in use, the larger end of the plumb bob is fixed with a thin string and suspended, while the tip is aligned with a control point on the ground, allowing the plumb bob to hang freely. The direction in which the tip of the plumb bob points is the direction of the Earth's gravity line.

[0003] A search revealed a patent application with application number CN201220618354.9 that discloses a suspended plumb bob with a measuring tape. The plumb bob includes a plumb bob body with a graduated scale on top of it. The scale is a measuring tape. Below the scale, a plumb bob body is attached via a deformation-resistant snap rope. Above the scale, there is a hanging rope with a hanging hole, and in the middle, there is a wear-resistant center line. This utility model is mainly used in construction projects such as mine shafts and tunnels, and can also be used in other measurement environments.

[0004] A patent application with application number CN201520577197.5 discloses a highly stable plumb bob. The beneficial effect of this utility model is that the plumb bob body is protected in a cylindrical sleeve, free from external environmental interference. The plumb bob can be lowered or raised by rotating the roller shaft. The hook makes it easy to hang the cylindrical sleeve on the beam, and the handle makes it easier and less strenuous to shake the roller shaft.

[0005] A patent application with application number CN201120578934.5 discloses a plumb bob with an integrated light. When using the plumb bob for measurement work at night or in low light conditions, simply pressing a miniature power switch on the plumb bob will power and illuminate four LEDs. The white light emitted by the LEDs not only illuminates the plumb line but also the measurement point below the plumb bob, providing convenience for measurement work. The plumb bob with an integrated light is simple to manufacture, easy to use, and inexpensive.

[0006] Although the existing plumb bobs can perform vertical measurements, they are ill-suited to the complex underground environment. Since traverse points are located on the tunnel roof, underground traverse surveying involves using a total station to measure the roof traverse points and then suspending a plumb bob to pinpoint their locations. During traverse surveying, the foresight, backsight, and instrument station all require the plumb bob to be suspended below the traverse points for precise location. However, the complex environment easily leads to corrosion and impact damage to the plumb bob's outer wall, causing a shift in its center of gravity. This prevents the tip of the plumb bob from naturally drooping, increasing centering errors and affecting measurement accuracy.

[0007] Therefore, a device for improving the centering accuracy at the point is proposed to address the above problems. Utility Model Content

[0008] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0009] The technical solution adopted by this utility model to solve its technical problem is as follows: The device for improving the centering accuracy of a point according to this utility model includes a plumb ball body; a threaded mounting groove is provided at the bottom end of the plumb ball body; a plumb tip seat is threadedly installed inside the threaded mounting groove; a ball groove is provided at the bottom of the plumb tip seat; and a ball head plumb tip is provided inside the ball groove.

[0010] Preferably, the top of the vertical tip seat has an injection hole; the bottom of the injection hole has an inner cavity; the bottom of the inner cavity has a plurality of connecting holes; the connecting holes communicate with the ball groove.

[0011] Preferably, a rubber plug is inserted into the inner ring of the top of the injection hole.

[0012] Preferably, an adjustment hole is formed in the center of the top surface of the plumb bob body; an annular groove is formed in the outer ring of the center of the adjustment hole; an adjustment column is slidably installed inside the adjustment hole; an adjustment cavity is formed inside the adjustment column; an opening is formed on one side of the adjustment cavity; the opening is aligned with the annular groove; an offset block is slidably installed inside the adjustment cavity; the offset block can slide out of the opening and into the annular groove; a driving structure is provided inside the adjustment cavity, and the driving structure can drive the offset block to slide.

[0013] Preferably, the driving structure includes a bidirectional screw rotatably mounted inside the adjusting column; the two ends of the bidirectional screw located inside the adjusting cavity have opposite thread directions; both ends of the bidirectional screw located inside the adjusting cavity are threaded with internal thread blocks; right-angled trapezoidal push plates are fixedly connected to both sides of the internal thread blocks; isosceles trapezoidal sliding plates are fixedly connected to both sides of the offset block near the inside of the adjusting cavity; the two inclined surfaces of the sliding plates are in sliding contact with the inclined surfaces of the two push plates respectively; the two sliding plates are located on both sides of the bidirectional screw.

[0014] Preferably, the adjustment cavity has sliding grooves on both sides; the slide plate is fixedly connected to an insert on the side away from the bidirectional screw; the insert slides in cooperation with the sliding groove; and a tension spring is fixedly connected between the insert and the sliding groove.

[0015] Preferably, the top of the adjusting post has a circular groove; the top of the bidirectional screw is fixedly connected to an internal hexagon head that matches the circular groove; an anti-slip ring is provided between the top outer ring of the bidirectional screw and the adjusting post; a convex ring is fixedly connected to the top outer ring of the adjusting post; a pressure ring is bolted to the top surface of the plumb bob body; the pressure ring is sleeved on the outer ring of the adjusting hole, and the inner ring of the pressure ring presses against the convex ring of the adjusting post.

[0016] Preferably, the top surface of the plumb bob body is provided with an annular groove; the annular groove is formed on the outer ring of the adjustment hole, and the annular groove is located below the convex ring of the adjustment post; a rubber ring gasket is fixedly connected inside the annular groove; the height of the rubber ring gasket is higher than the depth of the annular groove in its natural state.

[0017] Preferably, the top outer ring of the adjusting column is threaded; a top cap is threaded onto the top outer ring of the adjusting column; the bottom of the top cap contacts the top surface of the pressure ring; and a suspension rope is provided on the top of the top cap.

[0018] Preferably, the top surface of the cap has a threaded hole in the center; the bottom surface of the threaded hole has a tapered hole in the center; a threaded plug is installed in the internal thread of the threaded hole; a through hole is formed in the center of the threaded plug; multiple elastic claws are fixedly connected to the outer ring of the bottom surface of the threaded plug; the elastic claws slide and bend in contact with the tapered hole; a cone block is provided in the center of the multiple elastic claws; the suspension rope passes through the through hole of the threaded plug and is fixedly connected to the cone block.

[0019] The advantages of this utility model are:

[0020] 1. The present invention provides a device for improving centering accuracy by comprising a plumb bob body, a plumb tip seat, a ball groove, and a plumb head tip. Since the top of the plumb head tip is a ball head and the bottom is a plumb tip, and the ball head tip can rotate within the ball groove, the bottom tip of the plumb head tip always faces the direction of the Earth's gravity line. Even when the plumb bob body deflects due to corrosion or damage causing a change in its center of gravity, the plumb head tip can freely rotate and adjust, ensuring that the bottom tip of the plumb head tip still faces the direction of the Earth's gravity line, thereby improving centering accuracy and thus measurement precision.

[0021] 2. The device for improving centering accuracy described in this utility model comprises an adjusting column, an offset block, a bidirectional screw, a push plate, and a sliding plate. The bidirectional screw drives two pairs of push plates to slide along the center of the adjusting cavity. The push plates push the sliding plate towards the opening of the adjusting cavity, and the sliding plate pushes the offset block out of the opening, causing it to slide into the annular groove. The adjusting column then rotates, causing the offset block to rotate within the annular groove. By adjusting the position of the offset block inside the plumb bob body, the counterweight of the offset block is adjusted, thereby adjusting the center of gravity of the plumb bob and aligning its center of gravity line with the axis of the plumb bob. This facilitates the adjustment of the plumb bob's center of gravity line, avoiding the need for replacement due to corrosion or impact damage to the outer wall of the plumb bob, thus extending its service life and saving costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of the present utility model;

[0024] Figure 2 This is an exploded view of the present invention;

[0025] Figure 3 This is a cross-sectional view of the present invention;

[0026] Figure 4 This is a cross-sectional view of the vertical tip seat and the ball head vertical tip in this utility model;

[0027] Figure 5 This is a perspective view of the adjusting column in this utility model;

[0028] Figure 6 This is a cross-sectional view of the adjusting column in this utility model;

[0029] Figure 7 This is a cross-sectional view of the top cap in this utility model;

[0030] Figure 8 This is an exploded view of the adjusting column in this utility model;

[0031] Figure 9 This is a perspective view of the top cap, threaded plug, and cone block in this utility model.

[0032] In the diagram: 1. Body of the plumb ball; 2. Plumb tip seat; 3. Ball groove; 4. Plumb tip of the ball head; 5. Injection hole; 6. Inner cavity; 7. Connecting hole; 8. Rubber plug; 9. Adjustment hole; 10. Ring groove; 11. Adjustment column; 12. Adjustment cavity; 13. Opening; 14. Offset block; 15. Two-way screw; 16. Push plate; 17. Slide plate; 18. Slide groove; 19. Insert; 20. Tension spring; 21. Pressure ring; 22. Rubber ring washer; 23. Top cap; 24. Suspension rope; 25. Threaded hole; 26. Tapered hole; 27. Threaded plug; 28. Elastic claw; 29. ​​Conical block. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0034] like Figures 1 to 4 As shown, a device for improving centering accuracy includes a plumb bob body 1; a threaded mounting groove is provided at the bottom end of the plumb bob body 1; a plumb tip seat 2 is threadedly mounted inside the threaded mounting groove; a ball groove 3 is provided at the bottom of the plumb tip seat 2; and a ball head plumb tip 4 is provided inside the ball groove 3.

[0035] Due to the complex environment of mines, the outer wall of the plumb bob is easily corroded and damaged by impact, causing the center line of the plumb bob to change. This prevents the tip of the plumb bob from hanging down naturally, resulting in increased centering error and affecting the accuracy of measurement. Therefore, this application provides a device to improve the centering accuracy at a point.

[0036] During operation, because the top of the ball-head plumb tip 4 is a ball and the bottom is a plumb tip, and the ball head of the ball-head plumb tip 4 can rotate in the ball groove 3, the bottom tip of the ball-head plumb tip 4 always faces the direction of the Earth's gravity line. After the plumb tip seat 2 is threaded into the threaded mounting groove at the bottom of the plumb body 1, the ball-head plumb tip 4 can rotate and adjust at the bottom of the plumb body 1. Therefore, when in use, even if the plumb body 1 is suspended at the top plate guide point, and the center line of gravity changes due to corrosion and damage, causing the plumb body 1 to deflect, the ball-head plumb tip 4 can rotate and adjust freely, so that the bottom tip of the ball-head plumb tip 4 still faces the direction of the Earth's gravity line, thereby improving the accuracy of alignment and thus improving the accuracy of measurement.

[0037] like Figures 1 to 4As shown, the top of the vertical tip 2 is provided with an injection hole 5; the bottom of the injection hole 5 is provided with an inner cavity 6; the bottom of the inner cavity 6 is provided with a plurality of connecting holes 7; the connecting holes 7 communicate with the ball groove 3; a rubber plug 8 is inserted into the inner ring of the top of the injection hole 5.

[0038] Because a lot of dust is generated during construction in the mine, and the dust enters the ball groove 3 of the vertical tip seat 2, it will affect the automatic rotation of the ball tip 4.

[0039] Before installing the tip seat 2, use a syringe to draw lubricating oil, pass the needle of the syringe through the rubber stopper 8, so that the needle of the syringe is inserted into the injection hole 5, and inject the lubricating oil in the syringe into the inner cavity 6 along the injection hole 5. The lubricating oil flows through multiple connecting holes 7 into the gap between the ball groove 3 and the ball tip 4, filling the gap.

[0040] After the tip seat 2 is installed into the threaded mounting groove of the ball body 1, the tip seat 2 and the threaded mounting groove are in a sealed environment. Furthermore, due to the sealing of the injection hole 5 by the rubber plug 8, the top of the injection hole 5 is sealed, so that the lubricating oil in the gap between the ball groove 3 and the ball tip 4 will not flow downward. The lubricating oil not only lubricates the ball groove 3 and the ball tip 4, improving the smoothness of the rotation of the ball tip 4, but also fills the gap between the ball groove 3 and the ball tip 4, effectively preventing external dust from entering.

[0041] When dust enters the gap between the ball groove 3 and the ball tip 4, the dust mixes with the lubricating oil to form sludge. At this time, the tip seat 2 is removed, and lubricating oil is injected into the inner cavity 6 using a syringe filled with lubricating oil. The new lubricating oil flushes out the sludge in the gap between the ball groove 3 and the ball tip 4, thereby effectively ensuring the smooth rotation of the ball tip 4 and improving the measurement accuracy.

[0042] like Figures 1 to 8 As shown, an adjustment hole 9 is provided in the center of the top surface of the plumb bob body 1; an annular groove 10 is provided in the outer ring of the center of the adjustment hole 9; an adjustment column 11 is slidably installed inside the adjustment hole 9; an adjustment cavity 12 is provided inside the adjustment column 11; an opening 13 is provided on one side of the adjustment cavity 12; the opening 13 is aligned with the annular groove 10; an offset block 14 is slidably installed inside the adjustment cavity 12; the offset block 14 can slide out of the opening 13 and enter the annular groove 10; a driving structure is provided inside the adjustment cavity 12, and the driving structure can drive the offset block 14 to slide.

[0043] The driving structure includes a bidirectional screw 15 rotatably mounted inside the adjusting column 11; the two ends of the bidirectional screw 15 located inside the adjusting cavity 12 have opposite thread directions; both ends of the bidirectional screw 15 located inside the adjusting cavity 12 are threaded with internal thread blocks; right-angled trapezoidal push plates 16 are fixedly connected to both sides of the internal thread blocks; isosceles trapezoidal sliding plates 17 are fixedly connected to both sides of the offset block 14 near the inside of the adjusting cavity 12; the two inclined surfaces of the sliding plates 17 slide in contact with the inclined surfaces of the two push plates 16 respectively; the two sliding plates 17 are located on both sides of the bidirectional screw 15 respectively.

[0044] During operation, when the outer wall of the plumb bob is corroded or damaged by impact, causing a change in the plumb bob's center of gravity, the double-acting screw 15 is rotated, cooperating with the internal thread block, so that the two pairs of push plates 16 slide along the middle of the adjustment cavity 12. The inclined surface of the push plate 16 slides into contact with the inclined surface of the slide plate 17. The push plate 16 pushes the slide plate 17 towards the opening 13 of the adjustment cavity 12. The slide plate 17 pushes the offset block 14 out of the opening 13 and into the annular groove 10. Then, the adjustment column 11 is rotated, causing the offset block 14 to rotate within the annular groove 10. By adjusting the position of the offset block 14 inside the plumb bob body 1, the counterweight of the offset block 14 is adjusted, thereby adjusting the plumb bob's center of gravity, and then readjusting the plumb bob's center of gravity to coincide with the plumb bob's axis.

[0045] This makes it easier to adjust the center line of gravity of the plumb bob, avoiding the situation where the plumb bob's outer wall must be replaced after corrosion or impact damage, thus improving the service life of the plumb bob and saving costs.

[0046] like Figure 6 and Figure 8 As shown, the adjustment cavity 12 has sliding grooves 18 on both sides; the slide plate 17 is fixedly connected to a block 19 on the side away from the bidirectional screw 15; the block 19 slides in conjunction with the sliding groove 18; a tension spring 20 is fixedly connected between the block 19 and the sliding groove 18.

[0047] By sliding the insert 19 into the groove 18, not only is the sliding of the slide plate 17 and the offset block 14 guided, but the slide plate 17 and the offset block 14 are also prevented from disengaging from the adjustment cavity 12. The tension spring 20 ensures that the inclined surface of the slide plate 17 can be in close contact with the inclined surface of the push plate 16, improving the stability of the slide plate 17. At the same time, the elastic force of the tension spring 20 is used to reset the slide plate 17 and the offset block 14 back into the adjustment cavity 12.

[0048] like Figures 5 to 9As shown, the top of the adjusting column 11 has a circular groove; the top of the bidirectional screw 15 is fixedly connected to an internal hexagon head that matches the circular groove; an anti-slip ring is provided between the top outer ring of the bidirectional screw 15 and the adjusting column 11; a convex ring is fixedly connected to the top outer ring of the adjusting column 11; a pressure ring 21 is bolted to the top surface of the plumb bob body 1; the pressure ring 21 is sleeved on the outer ring of the adjusting hole 9, and the inner ring of the pressure ring 21 presses against the convex ring of the adjusting column 11;

[0049] During operation, once the adjusting column 11 is fully adjusted, i.e. the center line of the plumb bob is adjusted, the pressure ring 21 is installed and locked onto the outer ring of the adjusting hole 9 using bolts. The pressure ring 21 is then used to lock and fix the adjusting column 11 onto the convex ring, thereby preventing the adjusting column 11 from moving during use.

[0050] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the top surface of the plumb bob body 1 is provided with an annular groove; the annular groove is opened on the outer ring of the adjustment hole 9, and the annular groove is located below the convex ring of the adjustment column 11; a rubber ring pad 22 is fixedly connected inside the annular groove; the height of the rubber ring pad 22 is higher than the depth of the annular groove in its natural state.

[0051] By positioning the rubber ring pad 22 below the convex ring of the adjusting post 11, when the pressure ring 21 presses down on the convex ring of the adjusting post 11, the rubber ring pad 22 is compressed into the annular groove. The elasticity of the rubber ring pad 22, combined with the downward pressure of the pressure ring 21, improves the fixing strength of the adjusting post 11. The anti-slip performance of the rubber ring pad 22 effectively reduces the possibility of the adjusting post 11 rotating and sliding.

[0052] like Figures 5 to 9 As shown, the top outer ring of the adjusting column 11 is threaded; a top cap 23 is threaded onto the top outer ring of the adjusting column 11; the bottom of the top cap 23 contacts the top surface of the pressure ring 21; a suspension rope 24 is provided on the top of the top cap 23; a threaded hole 25 is provided in the middle of the top surface of the top cap 23; a tapered hole 26 is provided in the middle of the bottom surface of the threaded hole 25; a threaded plug 27 is installed in the internal thread of the threaded hole 25; a through hole is provided in the middle of the threaded plug 27; multiple elastic claws 28 are fixedly connected around the bottom outer ring of the threaded plug 27; the elastic claws 28 slide and bend in contact with the tapered hole 26; a cone block 29 is provided in the middle of the multiple elastic claws 28; the suspension rope 24 passes through the through hole of the threaded plug 27 and is fixedly connected to the cone block 29;

[0053] During operation, after the pressure ring 21 secures the adjusting column 11, the suspension rope 24 is passed through the through hole of the threaded plug 27, and the end of the suspension rope 24 is fixed to the cone block 29. The suspension rope 24 is tightened, causing the cone block 29 to move between multiple elastic claws 28. Then, the threaded plug 27 is threaded into the threaded hole 25, so that multiple elastic claws 28 are inserted into the conical hole 26, making the bottom ends of the multiple elastic claws 28 close together, and the multiple elastic claws 28 clamp and fix the cone block 29. After that, the top cap 23 is threaded onto the top of the adjusting column 11, thereby securing the suspension rope 24 to the top center of the plumb bob body 1, while avoiding affecting the adjustment of the adjusting column 11. At the same time, the top cap 23 will press down on the pressure ring 21, further improving the overall stability.

[0054] Working principle: When the outer wall of the plumb bob is corroded or damaged by impact, causing the center line of gravity of the plumb bob to change, the top cap 23 is removed from the top of the adjusting column 11, and the pressure ring 21 is removed from the top of the plumb bob body 1.

[0055] Rotating the bidirectional screw 15, in conjunction with the internal thread block, causes the two pairs of push plates 16 to slide along the middle of the adjustment cavity 12. The inclined surface of the push plate 16 slides into contact with the inclined surface of the slide plate 17. The push plate 16 pushes the slide plate 17 towards the opening 13 of the adjustment cavity 12. The slide plate 17 pushes the offset block 14 out of the opening 13 and into the annular groove 10. Then, rotating the adjustment column 11 causes the offset block 14 to rotate within the annular groove 10. By adjusting the position of the offset block 14 inside the plumb bob body 1, the counterweight of the offset block 14 is adjusted, thereby adjusting the center of gravity of the plumb bob and re-aligning the center line of gravity of the plumb bob with the axis of the plumb bob. Then, the pressure ring 21 is installed on the top of the plumb bob body 1, and the top cap 23 is installed on the top of the adjustment column 11.

[0056] Next, using a syringe to draw lubricating oil, the needle of the syringe is passed through the rubber stopper 8, so that the needle of the syringe is inserted into the injection hole 5. The lubricating oil in the syringe is injected into the inner cavity 6 along the injection hole 5. The lubricating oil flows into the gap between the ball groove 3 and the ball tip 4 through multiple connecting holes 7. The new lubricating oil washes out the sludge in the gap between the ball groove 3 and the ball tip 4, thereby effectively ensuring the smooth rotation of the ball tip 4 and thus improving the measurement accuracy.

[0057] Next, pass the lifting rope 24 through the through hole of the threaded plug 27, and then fix the end of the lifting rope 24 to the cone block 29. Tighten the lifting rope 24 to move the cone block 29 between the multiple elastic claws 28. Then, thread the threaded plug 27 into the threaded hole 25 so that the multiple elastic claws 28 are inserted into the cone hole 26, so that the bottom ends of the multiple elastic claws 28 are close together and the multiple elastic claws 28 clamp and fix the cone block 29. After that, thread the top cap 23 onto the top of the adjusting column 11.

[0058] When in use, even if the center line of the plumb bob 1 changes due to corrosion and damage, causing the plumb bob 1 to deflect, the plumb tip 4 can still rotate freely, so that the bottom tip of the plumb tip 4 still faces the direction of the Earth's gravity line, thereby improving the accuracy of centering and thus improving the precision of measurement.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A device for improving the centering accuracy of a point, characterized in that: It includes a plumb bob body; a threaded mounting groove is provided at the bottom end of the plumb bob body; a plumb tip seat is threadedly installed inside the threaded mounting groove; a ball groove is provided at the bottom of the plumb tip seat; and a ball head plumb tip is provided inside the ball groove.

2. The device for improving point alignment accuracy according to claim 1, characterized in that: The top of the vertical tip is provided with an injection hole; the bottom of the injection hole is provided with an inner cavity; the bottom of the inner cavity is provided with a plurality of connecting holes; the connecting holes communicate with the ball groove.

3. The device for improving point alignment accuracy according to claim 2, characterized in that: A rubber plug is inserted into the inner ring of the top of the injection hole.

4. The device for improving point alignment accuracy according to claim 1, characterized in that: An adjustment hole is provided in the center of the top surface of the plumb bob body; an annular groove is provided in the outer ring of the center of the adjustment hole; an adjustment column is slidably installed inside the adjustment hole; an adjustment cavity is provided inside the adjustment column; an opening is provided on one side of the adjustment cavity; the opening is aligned with the annular groove; an offset block is slidably installed inside the adjustment cavity; the offset block can slide out of the opening and into the annular groove; a driving structure is provided inside the adjustment cavity, and the driving structure can drive the offset block to slide.

5. The device for improving point alignment accuracy according to claim 4, characterized in that: The driving structure includes a bidirectional screw rotatably mounted inside the adjusting column; the two ends of the bidirectional screw located inside the adjusting cavity have opposite thread directions; both ends of the bidirectional screw located inside the adjusting cavity are threaded with internal thread blocks; right-angled trapezoidal push plates are fixed to both sides of the internal thread blocks; isosceles trapezoidal sliding plates are fixed to both sides of the offset block near the inside of the adjusting cavity; the two inclined surfaces of the sliding plates slide in contact with the inclined surfaces of the two push plates respectively; the two sliding plates are located on both sides of the bidirectional screw.

6. The device for improving point alignment accuracy according to claim 5, characterized in that: The adjustment cavity has sliding grooves on both sides; the slide plate is fixedly connected to a block on the side away from the bidirectional screw; the block slides in conjunction with the sliding groove; and a tension spring is fixedly connected between the block and the sliding groove.

7. The device for improving point alignment accuracy according to claim 5, characterized in that: The top of the adjusting column has a circular groove; the top of the bidirectional screw is fixedly connected to an internal hexagon head that matches the circular groove; an anti-slip ring is provided between the top outer ring of the bidirectional screw and the adjusting column; a convex ring is fixedly connected to the top outer ring of the adjusting column; a pressure ring is bolted to the top surface of the plumb bob body; the pressure ring is sleeved on the outer ring of the adjusting hole, and the inner ring of the pressure ring presses against the convex ring of the adjusting column.

8. The device for improving point alignment accuracy according to claim 7, characterized in that: The top surface of the plumb bob body is provided with an annular groove; the annular groove is located on the outer ring of the adjustment hole and below the convex ring of the adjustment post; a rubber ring gasket is fixed inside the annular groove; the height of the rubber ring gasket is higher than the depth of the annular groove in its natural state.

9. A device for improving point alignment accuracy according to claim 7, characterized in that: The top outer ring of the adjusting column is threaded; a top cap is threaded onto the top outer ring of the adjusting column; the bottom of the top cap contacts the top surface of the pressure ring; and a suspension rope is provided on the top of the top cap.

10. A device for improving point alignment accuracy according to claim 9, characterized in that: The top surface of the cap has a threaded hole in the center; the bottom surface of the threaded hole has a tapered hole in the center; a threaded plug is installed in the internal thread of the threaded hole; a through hole is opened in the center of the threaded plug; multiple elastic claws are fixedly connected around the outer ring of the bottom surface of the threaded plug; the elastic claws slide and bend in contact with the tapered hole; a cone block is provided in the center of the multiple elastic claws; the suspension rope passes through the through hole of the threaded plug and is fixedly connected to the cone block.

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