A laser measuring instrument for pipe column length

Abstract

The application belongs to the technical field of measuring instrument equipment, and discloses a pipe column length laser measuring instrument, which comprises a base, the surface of the base is provided with a measuring instrument body, one end of the measuring instrument body is provided with a laser measuring probe, the side wall of the measuring instrument body is fixedly provided with a protective cover sleeved outside the laser measuring probe, the surface of the measuring instrument body is provided with a dust removal mechanism, the dust removal mechanism comprises a brush, a positioning assembly, a rotating assembly and a guide assembly, the surface of the base is provided with a protection mechanism, the protection mechanism comprises a side protection assembly and a top protection assembly, the relative position of the brush and the protective cover can be conveniently adjusted through the positioning assembly, the rotating assembly and the guide assembly, the brush can be controlled to rotate around the protective cover, and the brush can efficiently clean dust and impurities attached to the surface of the protective cover.

Description

Technical Field

[0001] This invention relates to the field of measuring instrument technology, specifically a laser measuring instrument for column length. Background Technology

[0002] During geological drilling, oil drilling, and oil production operations, drill pipes or tubing strings need to be lowered into the well. When lowering the tubing strings, the length of each tubing string on site needs to be measured with a measuring instrument and recorded one by one. The tubing strings are connected in sequence when lowered into the well. After being lowered into the well, the length of each tubing string needs to be accumulated to determine the depth of the tubing strings and downhole tools.

[0003] When using laser measuring instruments, a transparent protective cover is typically installed on the outside of the laser measuring probe to seal and protect it. However, in actual use, due to the high levels of dust and impurities at construction sites, a large amount of dirt easily adheres to the surface of the protective cover, affecting the measurement accuracy of the laser measuring probe. This necessitates manual cleaning of the protective cover periodically by staff, resulting in poor performance. Furthermore, the measuring instrument itself lacks necessary protective measures, allowing dust and other impurities to easily accumulate on its surface, thus shortening its lifespan. Summary of the Invention

[0004] The purpose of this invention is to provide a laser measuring instrument for pipe length to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A laser measuring instrument for measuring the length of a tube column includes a base with supporting legs arranged around its bottom wall. A measuring instrument body is mounted on the surface of the base, and a laser measuring probe is mounted at one end of the measuring instrument body. A protective cover, hemispherical in shape, is fixedly mounted on the side wall of the measuring instrument body and fitted around the laser measuring probe. A dust removal mechanism, comprising a brush, a positioning component, a rotating component, and a guiding component, is provided on the surface of the measuring instrument body. The positioning component is located on the surface of the measuring instrument body and connected to the brush. The rotating component is connected to the positioning component and controls the brush to rotate around the protective cover. The guiding component is connected to the positioning component and adjusts the relative position of the brush and the protective cover. A protective mechanism, comprising a side protective component and a top protective component, is provided on the surface of the base. The side protective component is located on the surface of the base, and the top protective component is connected to the side protective component. The side protective component seals and protects the measuring instrument body from all sides, and the top protective component seals and protects the top of the measuring instrument body.

[0006] As a further embodiment of the present invention: the positioning component includes a fixing ring rotatably mounted on the side wall of the measuring instrument body and sleeved on the outside of the protective cover; a bearing rod is rotatably mounted on the surface of the fixing ring; the bearing rod has an arc-shaped structure; brushes are evenly distributed on the surface of the bearing rod; a fixing plate is fixedly mounted on the surface of the bearing rod; two sets of oppositely distributed first magnetic blocks are fixedly mounted on the side wall of the measuring instrument body; and two sets of second magnetic blocks are fixedly mounted on the side wall of the fixing plate.

[0007] As a further aspect of the present invention: the rotating assembly includes an annular gear ring fixedly mounted on the side wall of a fixed ring, a motor fixedly mounted inside the measuring instrument body, the output shaft of the motor extending to the outside of the measuring instrument body and fixedly mounted with a transmission gear disc, the transmission gear disc meshing with the gear ring.

[0008] As a further aspect of the present invention: the guide assembly includes an annular guide gear ring fixedly mounted on the side wall of a fixed plate, a support rod fixedly mounted on the side wall of the measuring instrument body, an arc-shaped guide rack fixedly mounted on the support rod, and the guide rack meshing with the guide gear ring for transmission.

[0009] As a further embodiment of the present invention: the side protection assembly includes vertical storage cylinders that are slidably installed around the base in a vertical direction. A top plate is fixedly installed at the top of the vertical storage cylinder, and a bottom plate is fixedly installed at the bottom of the vertical storage cylinder. Both the top plate and the bottom plate are made of magnetic material. Magnetic rings are fixedly installed on the top and bottom walls of the base, respectively. A vertical winding roller is rotatably installed inside the vertical storage cylinder. Coil springs are respectively provided at both ends of the vertical winding roller. A side protection curtain is wound on the surface of the vertical winding roller. One end of the side protection curtain extends to the outside of the vertical storage cylinder and is fixedly installed with a first control strip. The first control strip is made of magnetic material. A first magnetic positioning strip is fixedly installed on the side wall of the vertical storage cylinder.

[0010] As a further embodiment of the present invention: the top protection assembly includes a horizontal storage cylinder with two sets of top plates fixedly installed together. A horizontal winding roller is rotatably installed inside the horizontal storage cylinder. A coil spring is provided at both ends of the horizontal winding roller. A top protective curtain is wound on the surface of the horizontal winding roller. One end of the top protective curtain extends to the outside of the horizontal storage cylinder and is fixedly installed with a second control strip. The second control strip is made of magnetic material. The other two sets of top plates are fixedly installed with a second magnetic positioning strip.

[0011] As a further embodiment of the present invention: the side wall of the measuring instrument body is provided with an annular limiting groove, a limiting ring is rotatably installed in the limiting groove, and the limiting ring extends to the outside of the limiting groove and is connected to the fixing ring.

[0012] Compared with existing technologies, the advantages of this invention are: by setting up positioning components, rotating components, and guiding components, the relative positions of the brush and the protective cover can be easily adjusted, and the brush can be controlled to rotate around the protective cover. The brush can efficiently clean the dust and impurities attached to the surface of the protective cover. This solves the problem that currently, due to the large amount of dust and impurities at construction sites, a large amount of impurities easily adhere to the surface of the protective cover, affecting the measurement accuracy of the laser measuring probe and making effective measurement impossible.

[0013] By setting up side protection components and top protection components, the measuring instrument body can be fully enclosed and protected, which solves the problem that current measuring instruments lack necessary protective measures and that dust and other impurities easily adhere to the surface of the measuring instrument, affecting its service life. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a laser measuring instrument for measuring the length of a tube column provided in an embodiment of the present invention. Figure 1 .

[0015] Figure 2 This is a three-dimensional structural diagram of a laser measuring instrument for measuring the length of a tube column provided in an embodiment of the present invention. Figure 2 .

[0016] Figure 3 This is a schematic diagram of the main structure of a laser measuring instrument for measuring the length of a tube column provided in an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of a brush and its connection structure in a laser measuring instrument for measuring the length of a tube column provided in an embodiment of the present invention.

[0018] Figure 5 This is a schematic diagram of the vertical storage cylinder and its connection structure in a laser measuring instrument for column length provided in an embodiment of the present invention.

[0019] Figure 6 for Figure 1 A magnified structural diagram of A in the middle.

[0020] Figure 7 for Figure 3 A magnified structural diagram of B in the diagram.

[0021] The components are as follows: 1-base, 11-support leg, 2-measuring instrument body, 21-laser measuring probe, 22-protective cover, 3-dust removal mechanism, 31-brush, 32-positioning component, 321-fixing ring, 322-bearing rod, 323-fixing plate, 324-first magnetic block, 325-second magnetic block, 33-rotating component, 331-gear ring, 332-motor, 333-transmission gear plate, 34-guide component, 341-guide gear ring. 342-Support rod, 343-Guide rack, 4-Protective mechanism, 41-Side protective assembly, 411-Vertical storage cylinder, 412-Top plate, 413-Bottom plate, 414-Vertical winding roller, 415-Side protective curtain, 416-First control bar, 417-First magnetic positioning bar, 418-Magnetic ring, 42-Top protective assembly, 421-Horizontal storage cylinder, 422-Top protective curtain, 423-Second magnetic positioning bar, 5-Limiting groove, 6-Limiting ring. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0023] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0024] like Figure 1 , Figure 3 The diagram shown is a structural diagram of a laser measuring instrument for column length provided in an embodiment of the present invention. It includes a base 1, with support legs 11 respectively arranged around the bottom wall of the base 1. A measuring instrument body 2 is arranged on the surface of the base 1. A laser measuring probe 21 is arranged at one end of the measuring instrument body 2. A protective cover 22 is fixedly installed on the side wall of the measuring instrument body 2 and sleeved on the outside of the laser measuring probe 21. The protective cover 22 is a transparent hemispherical structure.

[0025] The measuring instrument body 2 is provided with a dust removal mechanism 3. The dust removal mechanism 3 includes a brush 31, a positioning component 32, a rotating component 33, and a guiding component 34. The positioning component 32 is located on the surface of the measuring instrument body 2 and is connected to the brush 31. The rotating component 33 is connected to the positioning component 32 and is used to control the brush 31 to rotate around the protective cover 22. The guiding component 34 is connected to the positioning component 32 and is used to adjust the relative position of the brush 31 and the protective cover 22.

[0026] The base 1 is provided with a protective mechanism 4. The protective mechanism 4 includes a side protective component 41 and a top protective component 42. The side protective component 41 is located on the surface of the base 1. The top protective component 42 is connected to the side protective component 41. The side protective component 41 is used to seal and protect the measuring instrument body 2 from all sides. The top protective component 42 is used to seal and protect the top of the measuring instrument body 2.

[0027] During use, the base 1 positions the measuring instrument body 2. During measurement, the protective cover 22 provides comprehensive protection for the laser measuring probe 21. Initially, the positioning component 32 controls the brush 31 to be positioned entirely outside the protective cover 22. When a large amount of dust and impurities adhere to the surface of the protective cover 22, the rotating component 33 drives the brush 31 to rotate around the protective cover 22. Initially, the brush 31 is positioned entirely outside the protective cover 22. The guide component 34 further adjusts the position of the brush 31, controlling its rotation towards the protective cover 22, so that the brush 31 adheres to the surface of the protective cover 22. During rotation, the brush 31 can thoroughly clean the impurities adhering to the surface of the protective cover 22. After the dust and impurities are cleaned, the rotating component 33 controls the brush 31 to stop rotating, and the guide component 34 controls the brush 31 to move away from the protective cover 22 again. During measurement, this effectively prevents the brush 31 from obstructing the protective cover 22. When the measuring instrument body 2 is in use, the side protection component 41 can enclose and protect the four sides of the measuring instrument body 2, and the top protection component 42 can enclose and protect the top of the measuring instrument body 2. During the entire use process, it can effectively prevent external dust and impurities from adhering to the surface of the measuring instrument body 2.

[0028] like Figure 1 , Figure 4 , Figure 6 , Figure 7 As shown, in a preferred embodiment of the present invention, the positioning component 32 includes a fixing ring 321 rotatably mounted on the side wall of the measuring instrument body 2 and sleeved on the outside of the protective cover 22. A bearing rod 322 is rotatably mounted on the surface of the fixing ring 321. The bearing rod 322 is provided with an arc-shaped structure. Brushes 31 are evenly distributed on the surface of the bearing rod 322. A fixing plate 323 is fixedly mounted on the surface of the bearing rod 322. Two sets of oppositely distributed first magnetic blocks 324 are fixedly mounted on the side wall of the measuring instrument body 2. Two sets of second magnetic blocks 325 are fixedly mounted on the side wall of the fixing plate 323.

[0029] Initially, the second magnetic block 325 on the surface of the fixing plate 323 and the first magnetic block 324 on the surface of the measuring instrument body 2 are connected as a whole by magnetic attraction. At this time, the fixing plate 323 positions the support rod 322 on the surface of the fixing ring 321, and the support rod 322 is located outside the protective cover 22. When the protective cover 22 needs to be cleaned, the rotating component 33 controls the fixing ring 321 to rotate on the surface of the measuring instrument body 2. The fixing ring 321 drives the support rod 322 to rotate synchronously. During the rotation, the guide component 34 controls the fixing plate 323 and the support rod 322 to rotate 180 degrees on the surface of the fixing ring 321. At this time, the support rod 322 drives the brush 31 to adhere to the surface of the protective cover 22. The brush 31 can efficiently clean the dust and impurities attached to the surface of the protective cover 22 during rotation. After cleaning, the guide component 34 controls the support rod 322 to rotate 180 degrees again on the surface of the fixing ring 321. The support rod 322 drives the brush 31 to move to the outside of the protective cover 22.

[0030] like Figure 1 , Figure 3 , Figure 6 As shown, in a preferred embodiment of the present invention, the rotating component 33 includes an annular gear ring 331 fixedly mounted on the side wall of a fixing ring 321. A motor 332 is fixedly mounted inside the measuring instrument body 2. The output shaft of the motor 332 extends to the outside of the measuring instrument body 2 and is fixedly mounted with a transmission gear disk 333. The transmission gear disk 333 meshes with the gear ring 331.

[0031] In use, the motor 332 drives the transmission gear plate 333 to rotate, and the transmission gear plate 333 meshes with the gear ring 331 to drive the fixed ring 321 to rotate at the side wall of the measuring instrument body 2.

[0032] like Figure 1 , Figure 4 , Figure 6 , Figure 7 As shown, in a preferred embodiment of the present invention, the guide assembly 34 includes an annular guide gear ring 341 fixedly mounted on the side wall of the fixing plate 323, a support rod 342 fixedly mounted on the side wall of the measuring instrument body 2, and an arc-shaped guide rack 343 fixedly mounted on the support rod 342. The guide rack 343 meshes with the guide gear ring 341 for transmission.

[0033] The fixed ring 321 drives the bearing rod 322 and the fixed plate 323 to rotate around the protective cover 22. The guide tooth ring 341 on the surface of the fixed plate 323 meshes with the guide rack 343, which can drive the bearing rod 322 to rotate on the surface of the fixed ring 321. The length and arc of the guide rack 343 are designed to match the rotation trajectory of the guide tooth ring 341. When the bearing rod 322 rotates 180 degrees, the guide tooth ring 341 and the guide rack 343 separate from each other. The second magnetic block 325 on the surface of the fixed plate 323 and the first magnetic block 324 on the surface of the measuring instrument body 2 are connected again to form a whole through magnetic attraction. At this time, the fixed plate 323 positions the bearing rod 322 on the surface of the fixed ring 321. At this time, the brush 31 is attached to the surface of the protective cover 22. After cleaning, the support rod 322 rotates to its original position. At this time, the guide tooth ring 341 on the surface of the fixing plate 323 meshes with the guide tooth rack 343, which can drive the support rod 322 to rotate again on the surface of the fixing ring 321. When the support rod 322 rotates 180 degrees, the support rod 322 drives the brush 31 to rotate to the outside of the protective cover 22.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, in a preferred embodiment of the present invention, the side protection assembly 41 includes vertical storage cylinders 411 that are slidably installed around the base 1 in a vertical direction. A top plate 412 is fixedly installed at the top of the vertical storage cylinder 411, and a bottom plate 413 is fixedly installed at the bottom of the vertical storage cylinder 411. Both the top plate 412 and the bottom plate 413 are made of magnetic material. Magnetic rings 418 are fixedly installed on the top and bottom walls of the base 1, respectively. A vertical winding roller 414 is rotatably installed inside the vertical storage cylinder 411. Coil springs are provided at both ends of the vertical winding roller 414. A side protection curtain 415 is wound onto the surface of the vertical winding roller 414. One end of the side protection curtain 415 extends to the outside of the vertical storage cylinder 411 and is fixedly installed with a first control strip 416. The first control strip 416 is made of magnetic material. A first magnetic positioning strip 417 is fixedly installed on the side wall of the vertical storage cylinder 411.

[0035] Initially, the vertical storage cylinder 411 is positioned below the base 1, with its top plate 412 engaging with the magnetic ring 418 on the surface of the base 1. When protection of the measuring instrument body 2 is required, the vertical storage cylinder 411 is pulled upwards, causing its bottom plate 413 to engage with the magnetic ring 418 on the bottom wall of the base 1. Pulling the first control bar 416 pulls the side protective curtain 415 out of the vertical storage cylinder 411, attaching it to the surface of the first magnetic positioning bar 417 on the surface of another adjacent set of vertical storage cylinders 411. Between the two sets of vertical storage cylinders 411, the side protective curtain 415 is stably supported and positioned. Multiple sets of side protective curtains 415 can provide complete enclosure protection for the measuring instrument body 2.

[0036] like Figure 1 , Figure 2 As shown, in a preferred embodiment of the present invention, the top protection assembly 42 includes a horizontal storage cylinder 421 with two sets of top plates 412 fixedly installed together. A horizontal winding roller is rotatably installed inside the horizontal storage cylinder 421. A coil spring is provided at both ends of the horizontal winding roller. A top protective curtain 422 is wound on the surface of the horizontal winding roller. One end of the top protective curtain 422 extends to the outside of the horizontal storage cylinder 421 and is fixedly installed with a second control strip. The second control strip is made of magnetic material. The other two sets of top plates 412 are fixedly installed with a second magnetic positioning strip 423.

[0037] After the vertical storage cylinder 411 is pulled above the base 1, multiple top plates 412 support and position the horizontal storage cylinder 421 and the second magnetic positioning strip 423 respectively. Pulling the second control strip will pull the top protective curtain 422 out of the inner cavity of the horizontal storage cylinder 421, and the second control strip and the second magnetic positioning strip 423 will be attached to each other to form a whole. At this time, the top protective curtain 422 is stably positioned above the measuring instrument body 2, thereby sealing and protecting the top of the measuring instrument body 2.

[0038] like Figure 3 , Figure 7 As shown, in a preferred embodiment of the present invention, the measuring instrument body 2 has an annular limiting groove 5 on its side wall, and a limiting ring 6 is rotatably installed in the limiting groove 5. The limiting ring 6 extends to the outside of the limiting groove 5 and is connected to the fixing ring 321.

[0039] When the fixed ring 321 rotates at the side wall of the measuring instrument body 2, it drives the limiting ring 6 to rotate synchronously in the limiting groove 5. The limiting ring 6 can effectively improve the stability of the fixed ring 321 during rotation.

[0040] The working principle of this invention is as follows: During use, the base 1 positions the measuring instrument body 2. When the measuring instrument body 2 is measuring, the protective cover 22 provides all-around protection for the laser measuring probe 21. The cleaning action of the brush 31 is performed before or after measurement; no cleaning action is performed while the measuring instrument body 2 is measuring.

[0041] Before or after measurement, initially, the brush 31 is positioned outside the protective cover 22. When a large amount of dust and impurities adhere to the surface of the protective cover 22, the motor 332 drives the transmission gear 333 to rotate. The transmission gear 333 meshes with the gear ring 331, causing the fixing ring 321 to rotate at the side wall of the measuring instrument body 2. The fixing ring 321 drives the bearing rod 322 and the fixing plate 323 to rotate around the protective cover 22. The guide gear ring 341 on the surface of the fixing plate 323 meshes with the guide rack 343, causing the bearing rod 322 to rotate on the surface of the fixing ring 321. When the bearing rod 322 rotates 180 degrees, the guide gear ring 341 and the guide rack 343 separate. The second magnetic block 325 on the surface of the fixing plate 323 and the first magnetic block 324 on the surface of the measuring instrument body 2 are connected again by magnetic attraction. At this time, the fixing plate 323 positions the bearing rod 322 on the surface of the fixing ring 321, and the brush 31 adheres to the surface of the protective cover 22. When the brush 31 rotates, it can efficiently clean the dust and impurities attached to the surface of the protective cover 22. After cleaning, the support rod 322 rotates back to its original position. At this time, the guide tooth ring 341 on the surface of the fixed plate 323 meshes with the guide rack 343, which can drive the support rod 322 to rotate again on the surface of the fixed ring 321. When the support rod 322 rotates 180 degrees, the support rod 322 drives the brush 31 to rotate to the outside of the protective cover 22.

[0042] The protective action is performed before or after the measurement. The protective action is not performed when the measuring instrument body 2 is measuring.

[0043] When protection of the measuring instrument body 2 is required, the vertical storage cylinder 411 is pulled upwards, causing the bottom plate 413 at the bottom of the vertical storage cylinder 411 to engage with the magnetic ring 418 on the bottom wall of the base 1. Pulling the first control bar 416 pulls the side protective curtain 415 out of the vertical storage cylinder 411, attaching the first control bar 416 to the surface of the first magnetic positioning bar 417 on the surface of another adjacent set of vertical storage cylinders 411. Between the two sets of vertical storage cylinders 411, the side protective curtain 415 can be stably supported and positioned. Multiple sets of side protective curtains 415 can provide complete enclosure protection for the measuring instrument body 2. Multiple sets of top plates 412 support and position the horizontal storage cylinder 421 and the second magnetic positioning strip 423 respectively. Pulling the second control strip will pull the top protective curtain 422 out of the inner cavity of the horizontal storage cylinder 421, and the second control strip and the second magnetic positioning strip 423 will be attached to each other to form a whole. At this time, the top protective curtain 422 is stably positioned above the measuring instrument body 2, thereby sealing and protecting the top of the measuring instrument body 2.

[0044] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A laser measuring instrument for tube length, comprising a base, wherein support legs are respectively provided around the bottom wall of the base, a measuring instrument body is provided on the surface of the base, and a laser measuring probe is provided at one end of the measuring instrument body, characterized in that, A protective cover, which is sleeved on the outside of the laser measuring probe, is fixedly installed on the side wall of the measuring instrument body. The protective cover has a hemispherical structure. The measuring instrument body surface is provided with a dust removal mechanism, which includes a brush, a positioning component, a rotating component and a guiding component. The positioning component is located on the measuring instrument body surface and is connected to the brush. The rotating component is used to control the brush to rotate around the protective cover; The guide component is used to adjust the relative position of the brush and the protective cover; The base surface is provided with a protective mechanism, which includes a side protective component and a top protective component; The side protection assembly is located on the base surface and is used to seal and protect the measuring instrument body from all sides. The top protection assembly is used to seal and protect the top of the measuring instrument body.

2. The laser measuring instrument for tube length according to claim 1, characterized in that, The positioning component includes a fixing ring rotatably mounted on the side wall of the measuring instrument body and sleeved on the outside of the protective cover. A bearing rod is rotatably mounted on the surface of the fixing ring. The bearing rod has an arc-shaped structure. Brushes are evenly distributed on the surface of the bearing rod. A fixing plate is fixedly mounted on the surface of the bearing rod. Two sets of oppositely distributed first magnetic blocks are fixedly mounted on the side wall of the measuring instrument body. Two sets of second magnetic blocks are fixedly mounted on the side wall of the fixing plate.

3. The laser measuring instrument for tube length according to claim 2, characterized in that, The rotating assembly includes an annular gear ring fixedly mounted on the side wall of a fixed ring. A motor is fixedly mounted inside the measuring instrument body. The output shaft of the motor extends to the outside of the measuring instrument body and is fixedly mounted with a transmission gear plate. The transmission gear plate meshes with the gear ring.

4. The laser measuring instrument for tube length according to claim 3, characterized in that, The guiding assembly includes an annular guide gear ring fixedly mounted on the side wall of a fixed plate, a support rod fixedly mounted on the side wall of the measuring instrument body, and an arc-shaped guide rack fixedly mounted on the support rod, the guide rack meshing with the guide gear ring for transmission.

5. A laser measuring instrument for measuring the length of a tube column according to claim 1, characterized in that, The side protection assembly includes vertical storage cylinders that are slidably installed around the base in a vertical direction. A top plate is fixedly installed at the top of each vertical storage cylinder, and a bottom plate is fixedly installed at the bottom of each vertical storage cylinder. Both the top plate and the bottom plate are made of magnetic material. Magnetic rings are fixedly installed on the top and bottom walls of the base, respectively. A vertical winding roller is rotatably installed inside the vertical storage cylinder. Coil springs are provided at both ends of the vertical winding roller. A side protection curtain is wound onto the surface of the vertical winding roller. One end of the side protection curtain extends to the outside of the vertical storage cylinder and is fixedly installed with a first control strip. The first control strip is made of magnetic material. A first magnetic positioning strip is fixedly installed on the side wall of the vertical storage cylinder.

6. The laser measuring instrument for tube length according to claim 5, characterized in that, The top protection assembly includes a horizontal storage cylinder with two sets of top plates fixedly installed together. A horizontal winding roller is rotatably installed inside the horizontal storage cylinder. A coil spring is provided at both ends of the horizontal winding roller. A top protective curtain is wound on the surface of the horizontal winding roller. One end of the top protective curtain extends to the outside of the horizontal storage cylinder and is fixedly installed with a second control strip. The second control strip is made of magnetic material. A second magnetic positioning strip is fixedly installed on the other two sets of top plates.

7. A laser measuring instrument for measuring the length of a tube column according to claim 2, characterized in that, The measuring instrument body has an annular limiting groove on its side wall. A limiting ring is rotatably installed in the limiting groove. The limiting ring extends to the outside of the limiting groove and is connected to a fixed ring.

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