Metal pipe size detection device

Abstract

The application discloses a metal pipe size detection device and relates to the related technical field of metal pipe size measurement. The device comprises a base, two groups of first telescopic rods are fixed at the bottom center position of a placing rack through the top position of the base, and the top center position of the base is fixed with the bottom center position of the placing rack through a supporting mechanism. A group of driving motors are fixedly installed at the left side position of the placing rack, the outer side of the first threaded rod is threadedly connected with the bottom position of a moving seat, and a group of laser measuring instrument bodies are rotatably arranged at the top of the moving seat. The metal pipe size detection device is provided with a limiting assembly. The first threaded rod drives the second threaded rod to rotate, so that the second threaded rod drives the limiting assembly to be driven and processed. In addition, the set conveying control assembly can adjust the angle of the laser measuring instrument body, thereby facilitating the measurement of the bent metal pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal pipe size measurement, in particular to a metal pipe size detection device. BACKGROUND

[0002] Metal pipe size detection is an important quality control process that ensures metal pipes meet specific size and geometric precision requirements during manufacturing and use. Existing technologies usually use laser detection systems for metal pipe size detection. A laser beam is shone on the surface of the metal pipe, and by measuring the reflection of the beam on the pipe wall or the deflection of the beam after passing through the pipe wall, the size of the metal pipe can be calculated.

[0003] The laser detection device for pipe inner wall disclosed in publication CN108106571U starts from the origin, enters the pipe along the y-axis, and drives the driving wheel to rotate through the driving of the second motor, so that the detection device enters the pipe smoothly and uniformly. At this time, the first motor starts to work, and through the set program, it realizes forward and reverse rotation within 120°, drives the laser displacement sensor to scan the inner wall of the pipe, and through the analysis of the laser displacement sensor data combined with the running state of the first motor and the second motor, the defect positioning and area and depth detection of the pipe inner wall are realized. The above device assists in processing through the crawling mechanism during work, but when assisting in processing metal pipes, especially when measuring and processing bent metal pipes, it cannot crawl stably, and when the inner wall of the metal pipe is not very large, crawling measurement at the bend cannot be effectively detected.

[0004] The laser detection device disclosed in publication CN109520423A controls the switching of the on-off between the laser assembly and the corresponding grating ruler through a relay. When the device is working, only the corresponding relay needs to be switched to measure which part, so that the measurement of multiple edges of the product can be realized through one laser assembly, which can save cost, reduce installation space, and be convenient to control. The above device detects through the laser assembly, and in the working process, different relays are switched to detect the edges. In order to ensure the accuracy of the measurement, the metal pipe needs to be limited when detecting the metal pipe. If the metal pipe cannot be effectively limited, the measured data may be deviated.

[0005] Therefore, we propose a metal pipe size detection device to solve the problems mentioned above. SUMMARY

[0006] The metal pipe size detection device aims to solve the problems that the laser detection device on the market cannot stably crawl when assisting the metal pipe, especially the bent metal pipe, the inner wall of the metal pipe is not very large, and the crawling measurement at the bending part cannot be effectively detected, and if the metal pipe cannot be effectively limited, the measured data will be deviated.

[0007] To achieve the above purpose, the metal pipe size detection device comprises a base, the top of the base is fixed at the bottom center of a placing rack through two groups of first telescopic rods, and the top center of the base is fixed with the bottom center of the placing rack through a supporting mechanism;

[0008] A group of drive motors are fixedly installed at the left side of the placing rack, the output end of the drive motor is fixed at the left end of a first threaded rod, the outer side of the first threaded rod is threadedly connected to the bottom of a moving seat, and a group of laser measuring instrument bodies are rotatably arranged at the top of the moving seat;

[0009] A group of limiting assemblies for limiting the inner wall of the metal pipe are arranged at the right side of the placing rack, a group of conveying control assemblies are fixed at the right bottom end of the placing rack, the conveying control assembly comprises a gas conveying pump, the connecting end of the gas conveying pump is connected with the bottom end of a first conveying pipe, and the bottom of the first conveying pipe is connected with a second conveying pipe through a four-way valve.

[0010] Preferably, one end of the second conveying pipe is arranged as a hard pipe inside the moving seat, the second conveying pipe is arranged as a soft pipe outside the moving seat, a piston rack is tightly arranged in the hard pipe of the second conveying pipe, the tooth blocks outside the piston rack are meshedly connected to the outer side of a rotating gear, the top of the rotating gear is rotatably connected to the inside of the moving seat, and the center of the rotating gear is fixed to the bottom center of the laser measuring instrument body, so that the laser measuring instrument body can be rotated.

[0011] Preferably, the supporting mechanism comprises a rotating threaded sleeve threadedly connected to the bottom center of the placing rack, a group of threaded connecting sleeves are threadedly connected to the outer side of the bottom end of the rotating threaded sleeve, a group of rotating rods are rotatably connected to the outer side of the four peripheries of the threaded connecting sleeves, and the bottom end of the rotating rod is rotatably connected to the top side of the end of an extension plate, so that the extension plate can stably slide in the base.

[0012] Preferably, the outer side of the extension plate is slidingly arranged at the bottom of the base, the extension plate and the inner part of the base form a sliding structure through a rotating rod, and the bottom of the rotating threaded sleeve is rotationally connected to the center of the top of the base, so that the adjustment process can be performed through the supporting mechanism.

[0013] Preferably, the inner part of the limiting assembly includes a horizontal connecting sleeve threadedly connected to the outer side of the two ends of the second threaded rod, the front and rear ends of the horizontal connecting sleeve are rotationally connected to one end of the supporting rod, the other end of the supporting rod is rotationally arranged at the end of the abutting plate, and the inner sides of the two abutting plates are provided with a second telescopic rod, so that the limiting assembly can stably limit the inner wall of the metal pipe.

[0014] Preferably, the moving direction of the two horizontal connecting sleeves is opposite, the outer side of the abutting plate is attached with a rubber pad for increasing friction, and the outer side of the abutting plate is attached to the inner wall of the metal pipe, so that the inner wall of the metal pipe can be stably limited.

[0015] Preferably, the right end of the first threaded rod and the left end of the second threaded rod are embedded, the opposite ends of the first threaded rod and the second threaded rod are rotationally arranged at the inner side of the fixed ring, a plurality of isolation rings are fixed in the inner part of the fixed ring, a plurality of accommodating rods are fixed at equal intervals in the inner part of the isolation ring, a plurality of arc-shaped magnetic blocks are slidingly arranged in the inner part of the accommodating rod, the arc-shaped magnetic blocks are arranged on the outer side of the first threaded rod, a moving magnetic block is arranged on the outer side of the first threaded rod, the bottom of the moving magnetic block is fixed to the outer side of the first threaded rod through a return spring, and a limiting groove is formed at one end of the second threaded rod inserted into the first threaded rod, so that the first threaded rod and the second threaded rod can be stably connected.

[0016] Preferably, a groove is formed in the outer side of the isolation ring, and the accommodating rod in the inner part of the groove is hollow. The arc-shaped magnetic block slidingly arranged in the inner part of the accommodating rod is connected to the piston sealingly arranged in the inner part of the accommodating rod, so that the gas in the inner part of the fixed ring can be delivered to the inner part of the accommodating rod.

[0017] Preferably, the piston arranged at the top of the arc-shaped magnetic block is fixed with a spring, the other end of the spring is attached to the inner part of the accommodating rod, and the arc-shaped magnetic block and the accommodating rod form an elastic sliding structure through the gas delivered by the accommodating rod, so that the arc-shaped magnetic block can stably slide in the inner part of the fixed ring.

[0018] Preferably, the inner equiangular of the fixed ring is provided with three groups of arc-shaped magnetic blocks, three groups of the arc-shaped magnetic blocks can form a closed circle after being closed, the magnetic poles of the arc-shaped magnetic blocks and the magnetic poles of the moving magnetic blocks are arranged in the same way, the magnetic force between the arc-shaped magnetic blocks and the moving magnetic blocks is greater than the elastic force of the reset spring, and the moving magnetic blocks and the outer side of the second threaded rod constitute a clamping structure through the limiting groove, so that stable butt joint processing between the second threaded rod and the first threaded rod can be realized.

[0019] Compared with the prior art, the beneficial effects of the metal pipe size detection device are that the limiting assembly is provided, the second threaded rod is driven to rotate by the first threaded rod, the second threaded rod drives the limiting assembly to drive, and the relative movement of the second extension rod is achieved, so that the inner wall of the metal pipe is limited, the limiting process is facilitated, and the conveying control assembly is provided to adjust the angle of the laser measuring instrument body, so that the bent metal pipe is measured, and specific contents are shown as follows:

[0020] 1. The second threaded rod is provided, the two groups of horizontal connecting sleeves provided on the outer side of the second threaded rod are relatively moved, so that the horizontal connecting sleeves slide on the rod outside the placing rack, at this time, the horizontal connecting sleeves drive the relative movement of the abutting plates through the supporting rods, the two groups of abutting plates are relatively moved through the second extension rod, so that the outer side of the abutting plates is attached to the inner wall of the metal pipe, and the purpose of limiting the inner wall of the metal pipe is achieved.

[0021] Further, the conveying control assembly is provided, the conveying gas passes through the inside of the fixed ring, since the fixed ring is provided with a group of isolation rings inside, at this time, the gas is conveyed to the inside of the containing rod through the groove of the isolation ring, three groups of arc-shaped magnetic blocks form a closed circle, and the arc-shaped magnetic blocks are close to one side of the moving magnetic blocks, so that the moving magnetic blocks extend into the limiting groove inside the second threaded rod, so as to facilitate the rotation and relaxation of the second threaded rod.

[0022] 2. The supporting mechanism is provided, the top outer side of the rotating threaded sleeve is threadedly connected to the top position of the placing rack, so that the height of the placing rack on the top of the base is adjusted through the first extension rod.

[0023] Further, the threaded connecting sleeve threadedly connected to the bottom position of the rotating threaded sleeve will be lowered, so that the threaded connecting sleeve will drive the extension plate to move through the rotating rod, so that the extension plate slides in the inside of the base, so as to expand the extension plate in the inside of the base, and further ensure the stability.

[0024] 3. A piston rack is provided. The gas inside the limit groove pushes the sealed piston rack to move. The outer side of the piston rack drives the meshing rotating gear to rotate, causing the rotating gear to rotate inside the moving seat. Since the top position of the rotating gear is fixed at the bottom center position of the laser measuring instrument body, the laser measuring instrument body can be rotated at the top position of the moving seat, which can change the angle of the laser measuring instrument body and facilitate the measurement of bent metal pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the present invention when viewed from above;

[0027] Figure 3 This is a schematic diagram of the main structure of the support mechanism of the present invention;

[0028] Figure 4 This is a schematic diagram of the main structure of the fixing ring of the present invention;

[0029] Figure 5 This is a schematic diagram of the main cross-sectional structure of the fixing ring of the present invention;

[0030] Figure 6 This is a partial front view of the first threaded rod of the present invention;

[0031] Figure 7 For the present invention Figure 6 A in the middle is an enlarged structural diagram;

[0032] Figure 8 This is a schematic diagram of the main structure of the limit assembly of the present invention;

[0033] Figure 9 For the present invention Figure 1 The enlarged structural diagram at B in the middle;

[0034] Figure 10 This is a schematic diagram of the cross-sectional structure of the movable seat of the present invention when viewed from above;

[0035] Figure 11 This is a schematic diagram of the structure of the laser measuring instrument of the present invention after the body is rotated.

[0036] In the figure: 1, base; 2, first telescopic rod; 3, supporting mechanism; 301, rotating threaded sleeve; 302, threaded connecting sleeve; 303, rotating rod; 304, extension plate; 4, placing rack; 5, driving motor; 6, first threaded rod; 7, laser measuring instrument body; 8, second threaded rod; 9, limiting assembly; 901, horizontal connecting sleeve; 902, supporting rod; 903, fitting plate; 904, second telescopic rod; 10, conveying control assembly; 1001, first conveying pipe; 1002, second conveying pipe; 1003, piston rack; 11, fixed ring; 12, isolation ring; 13, containing rod; 14, arc-shaped magnetic block; 15, moving magnetic block; 16, reset spring; 17, limiting groove; 18, moving seat; 19, rotating gear. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0038] Please refer to Figures 1-11 The present application provides the following technical solutions:

[0039] Embodiment one: in order to solve the problem that the laser detection device on the market cannot stably crawl when facing the auxiliary treatment of metal pipes, especially when measuring and processing the bent metal pipes, and the inner wall of the metal pipe is not very large, and when crawling and measuring at the bending part, it cannot effectively detect and process, please refer to the accompanying Figure 1 and the accompanying Figure 9 - the accompanying Figure 11; including the base 1, the top position of the base 1 is fixed at the bottom center position of the rack 4 through two groups of first telescopic rods 2, the top center position of the base 1 is fixed with the bottom center position of the rack 4 through the support mechanism 3; the left side position of the rack 4 is fixedly installed with a group of driving motors 5, the output end position of the driving motor 5 is fixed at the left end position of the first threaded rod 6, the outer side of the first threaded rod 6 is threadedly connected at the bottom position of the moving seat 18, and a group of laser measuring instruments bodies 7 are rotatably arranged at the top of the moving seat 18; a group of limiting assemblies 9 limiting the inner wall of the metal pipe are arranged at the right side position of the rack 4, and a group of conveying control assemblies 10 are fixed at the right side position of the bottom end of the rack 4, the conveying control assembly 10 comprises a gas delivery pump, the connecting end of the gas delivery pump is connected with the bottom end of the first conveying pipe 1001, and the bottom position of the first conveying pipe 1001 is connected with the second conveying pipe 1002 through a four-way valve. One end of the second conveying pipe 1002 extends into the inner position of the moving seat 18 to be provided as a hard pipe, the second conveying pipe 1002 is provided outside the moving seat 18 as a soft pipe, and the hard pipe of the second conveying pipe 1002 is tightly fitted with a piston rack 1003. The tooth block on the outer side of the piston rack 1003 is engagedly connected to the outer side of the rotating gear 19, the top position of the rotating gear 19 is rotatably connected to the inner position of the moving seat 18, and the center position of the rotating gear 19 is fixed to the bottom center position of the laser measuring instrument body 7.

[0040] Firstly, the internal part of the second conveying pipe 1002 is treated by the conveying control assembly 10, and the valve of the first conveying pipe 1001 is closed, the gas in the internal part of the second conveying pipe 1002 will push the piston rack 1003 connected in a sealed manner to move, at this time, the outer side of the piston rack 1003 will drive the rotating gear 19 connected in a meshing manner to rotate, causing the rotating gear 19 to rotate in the internal part of the moving seat 18, since the top position of the rotating gear 19 is fixed to the bottom center position of the laser measuring instrument body 7, at this time, the laser measuring instrument body 7 can rotate on the top position of the moving seat 18, so that the two sides of the fixed bent metal pipe can be detected.

[0041] Example two: in order to solve the problem that the metal pipe cannot be effectively limited and the measured data is deviated, please refer to the following Figure 1 , the following Figure 2 and the following Figure 4 - the following Figure 8The inner part of the limiting assembly 9 comprises two horizontal connecting sleeves 901 threadedly connected at the outer sides of the two ends of the second threaded rod 8. The front and rear ends of the horizontal connecting sleeves 901 are rotationally connected to one end of a supporting rod 902. The other end of the supporting rod 902 is rotationally arranged at the end of a clamping plate 903. A second telescopic rod 904 is arranged at the inner side of the two clamping plates 903. The moving direction of the two horizontal connecting sleeves 901 is opposite. Rubber pads for increasing friction are attached to the outer sides of the clamping plates 903. The outer sides of the clamping plates 903 are attached to the inner wall of the metal pipe. The right end of the first threaded rod 6 is embeddedly arranged at the left end of the second threaded rod 8. The positions where the first threaded rod 6 and the second threaded rod 8 are opposite to each other are rotationally arranged at the inner side of a fixing ring 11. A plurality of isolation rings 12 are fixed at the inner part of the fixing ring 11. A plurality of accommodating rods 13 are fixed at the inner part of the isolation rings 12 at equal intervals. A plurality of arc-shaped magnetic blocks 14 are slidingly attached to the inner part of the accommodating rods 13. The arc-shaped magnetic blocks 14 are arranged at the outer side of the first threaded rod 6. A moving magnetic block 15 is arranged at the outer side of the first threaded rod 6. The bottom of the moving magnetic block 15 is fixed to the outer side of the first threaded rod 6 through a return spring 16. A limiting groove 17 is arranged at the end of the second threaded rod 8 which extends into the first threaded rod 6. A groove is arranged at the outer side of the isolation ring 12. The inner part of the accommodating rod 13 is hollow. The arc-shaped magnetic block 14 arranged at the inner part of the accommodating rod 13 is connected to the piston arranged at the inner part of the accommodating rod 13 through sealing attachment. A spring is fixed to the top of the arc-shaped magnetic block 14. The other end of the spring is attached to the inner part of the accommodating rod 13. The gas delivered by the arc-shaped magnetic block 14 through the accommodating rod 13 forms an elastic sliding structure with the accommodating rod 13. Three arc-shaped magnetic blocks 14 are arranged at equal angles at the inner part of the fixing ring 11. The three arc-shaped magnetic blocks 14 form a closed circle when closed. The magnetic poles of the arc-shaped magnetic blocks 14 and the magnetic poles of the moving magnetic block 15 are arranged in the same way. The magnetic force between the arc-shaped magnetic blocks 14 and the moving magnetic block 15 is greater than the elastic force of the return spring 16. The moving magnetic block 15 forms a clamping structure with the outer side of the second threaded rod 8 through the limiting groove 17,

[0042] When the inner wall of the metal pipe is limited, the conveying control assembly 10 is started, so that the conveying control assembly 10 conveys the gas through the inside of the fixed ring 11. Since a set of isolation rings 12 are fixed in the inside of the fixed ring 11, the gas will be conveyed through the groove of the isolation ring 12 to the inside of the containing rod 13. The arc-shaped magnetic block 14 slidingly arranged in the inside of the containing rod 13 will be moved by the piston. At this time, the piston will drive the spring to extend, so that the arc-shaped magnetic block 14 slides in the inside of the containing rod 13. At this time, the three sets of arc-shaped magnetic blocks 14 will form a closed circle, and the arc-shaped magnetic block 14 will be close to the side of the moving magnetic block 15. Since the magnetic force between the moving magnetic block 15 and the arc-shaped magnetic block 14 is greater than the elastic force of the return spring 16, the return spring 16 will be extruded at this time, so that the moving magnetic block 15 will extend into the limiting groove 17 inside the second threaded rod 8. At this time, when the output end of the driving motor 5 rotates through the first threaded rod 6, the first threaded rod 6 will drive the second threaded rod 8 to rotate. At this time, the first threaded rod 6 and the second threaded rod 8 rotate in the inside of the fixed ring 11. When the second threaded rod 8 rotates, the two sets of horizontal connecting sleeves 901 arranged outside the second threaded rod 8 will move relatively, so that the horizontal connecting sleeves 901 slide on the rod outside the placing rack 4. At this time, the horizontal connecting sleeves 901 drive the abutting plates 903 to move relatively through the supporting rods 902. The two sets of abutting plates 903 will move relatively through the second extension rods 904, so that the outside of the abutting plates 903 will abut on the inner wall of the metal pipe. When the inside of the metal pipe is limited, stop conveying the gas in the inside of the fixed ring 11, and release the gas in the inside of the first conveying pipe 1001 through the valve. At this time, the release of the gas will cause the arc-shaped magnetic block 14 to reset through the piston arranged on the top and a set of springs, and the outside of the magnetic block 15 will be separated from the inside of the limiting groove 17, so as to continue to ensure that the laser measuring instrument body 7 moves on the outside of the first threaded rod 6 through the moving seat 18.

[0043] Example three: in order to adjust the use height of the placing rack 4, please refer to the attached Figure 1 -attached Figure 3The inside of the supporting mechanism 3 comprises a rotating threaded sleeve 301 which is screwed at the bottom center of the rack 4, a set of threaded sleeves 302 which are screwed at the outside of the bottom of the rotating threaded sleeve 301, a set of rotating rods 303 which are rotatably connected at the outside of the threaded sleeves 302, and an extension plate 304 which is rotatably connected at the bottom end of the rotating rods 303. The outside of the extension plate 304 is slidably arranged at the bottom of the base 1, and the extension plate 304 forms a sliding structure with the inside of the base 1 through the rotating rods 303, and the bottom of the rotating threaded sleeve 301 is rotatably connected at the top center of the base 1. By using the supporting mechanism 3 to adjust, rotating the rotating threaded sleeve 301, the top outside of the rotating threaded sleeve 301 is screwed at the top of the rack 4, so that the rack 4 can be adjusted in height on the top of the base 1 through the first telescopic rod 2, and the threaded sleeves 302 screwed at the bottom of the rotating threaded sleeve 301 will be lowered, so that the threaded sleeves 302 will drive the extension plate 304 to move through the rotating rods 303, so that the extension plate 304 slides in the inside of the base 1, thereby increasing the supporting area of the base 1, and ensuring the stability of the base 1 and the rack 4.

[0044] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications can be made to the foregoing embodiments, or other technically equivalent substitutions can be made to some of the technical features thereof, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A metal pipe size detection device, comprising a base (1), wherein the top position of the base (1) is fixed to the bottom center position of a placement rack (4) via two sets of first telescopic rods (2), and the top center position of the base (1) is fixed to the bottom center position of the placement rack (4) via a supporting mechanism (3); Its characteristics are: A set of driving motors (5) are fixedly installed at the left side of the placement rack (4), the output end of the driving motor (5) is fixed at the left end of the first threaded rod (6), the outer side of the first threaded rod (6) is threadedly connected to the bottom of the moving seat (18), and a set of laser measuring instrument bodies (7) are rotatably provided at the top of the moving seat (18); A set of limiting components (9) for limiting the inner wall of the metal tube is provided on the right side of the placement rack (4), and a set of conveying control components (10) is fixed on the right side of the bottom end of the placement rack (4). The conveying control component (10) includes an air pump, and the connecting end of the air pump is connected to the bottom end of the first conveying pipe (1001). The bottom position of the first conveying pipe (1001) is connected to the second conveying pipe (1002) through a four-way valve. The interior of the limiting assembly (9) includes a horizontal connecting sleeve (901) threadedly connected to the outer sides of the two ends of the second threaded rod (8); the front and rear ends of the horizontal connecting sleeve (901) are rotatably connected to one end of the support rod (902); the other end of the support rod (902) is rotatably arranged at the end of the bonding plate (903); and a group of second telescopic rods (904) are arranged on the inner sides of the two groups of bonding plates (903); One end of the second delivery pipe (1002) extends into the interior of the movable seat (18) and is provided as a hard pipe. The second delivery pipe (1002) is provided on the outside of the movable seat (18) and is provided as a soft pipe. A piston rack (1003) is tightly fitted inside the hard pipe of the second delivery pipe (1002). The tooth block on the outside of the piston rack (1003) is meshedly connected to the outer position of the rotating gear (19). The top position of the rotating gear (19) is rotatably connected to the interior position of the movable seat (18). The center position of the rotating gear (19) is fixed at the bottom center position of the laser measuring instrument body (7). The right end of the first threaded rod (6) and the left end of the second threaded rod (8) are embedded in each other, and the positions where the first threaded rod (6) and the second threaded rod (8) are connected are both rotatably set on the inner side of the fixed ring (11), and a group of isolation rings (12) are fixed in the inner position of the fixed ring (11), and a group of accommodating rods (13) are fixed at equal intervals inside the isolation ring (12), and a group of arc-shaped magnetic blocks (14) are slidably fitted inside the accommodating rods (13), and the arc-shaped magnetic blocks (14) are set on the outer side of the first threaded rod (6). A movable magnetic block (15) is set on the outer side of the first threaded rod (6), and the bottom position of the movable magnetic block (15) is fixed to the outer position of the first threaded rod (6) by a reset spring (16), and a limiting groove (17) is provided at one end position of the second threaded rod (8) extending into the interior of the first threaded rod (6); Three groups of arc-shaped magnetic blocks (14) are arranged at equal angles inside the fixed ring (11). The three groups of arc-shaped magnetic blocks (14) can form a closed circle when closed. The magnetic poles of the arc-shaped magnetic blocks (14) and the magnetic poles of the movable magnetic blocks (15) are arranged to be the same. The magnetic force between the arc-shaped magnetic blocks (14) and the movable magnetic blocks (15) is greater than the elastic force of the reset spring (16). The movable magnetic block (15) forms a locking structure with the outer side of the second threaded rod (8) through the limiting groove (17).

2. The metal tube size detection device according to claim 1, characterized in that: The interior of the support mechanism (3) includes a rotating threaded sleeve (301) threadedly connected to the center position of the bottom of the placement frame (4); a group of threaded connection sleeves (302) are threadedly connected to the outer side of the bottom end of the rotating threaded sleeve (301); a group of rotating rods (303) are rotatably connected to the outer peripheral positions of the threaded connection sleeve (302); the bottom end of the rotating rod (303) is rotatably connected to the top side position of the end of the extension plate (304).

3. The metal tube size detection device according to claim 2, characterized in that: The outer side of the extension plate (304) is slidably arranged at the bottom of the base (1), and the extension plate (304) forms a sliding structure with the interior of the base (1) through the rotating rod (303), and the bottom position of the rotating threaded sleeve (301) is rotatably connected to the top center position of the base (1).

4. The metal tube size detection device according to claim 1, characterized in that: The moving directions of the two groups of horizontal connecting sleeves (901) are relatively set, and a group of rubber pads for increasing friction are adhered to the outer side of the bonding plate (903), and the outer side of the bonding plate (903) is bonded to the inner wall of the metal pipe.

5. The metal pipe size detection device according to claim 1, characterized in that: A groove is provided on the outside of the isolation ring (12), and the interior of the groove is connected to the accommodating rod (13) which is hollow. An arc-shaped magnetic block (14) is slidably arranged inside the accommodating rod (13) and is connected to the interior of the accommodating rod (13) through a piston that is sealed and fitted.

6. The metal tube size detection device according to claim 5, characterized in that: A group of springs are fixed to the piston arranged on the top of the arc-shaped magnetic block (14), and the other end of the spring is fitted into the inner position of the accommodating rod (13). The arc-shaped magnetic block (14) forms an elastic sliding structure with the accommodating rod (13) through the gas transported by the accommodating rod (13).

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