Metal tube size detection device

Abstract

The invention discloses a metal tube size detection device, and relates to the related technical field of metal tube size measurement, the metal tube size detection device comprises a base, the top position of the base is fixed to the bottom center position of a placement rack through two groups of first telescopic rods, and the top center position of the base is fixed to the bottom center position of the placement rack through a supporting mechanism; and a set of driving motors are fixedly installed on the left side of the containing frame, the outer side of the first threaded rod is in threaded connection to the bottom of a movable base, and a set of laser measuring instrument bodies are rotationally arranged on the top of the movable base. The metal tube size detection device is provided with the limiting assembly, a first threaded rod drives a second threaded rod to rotate, the second threaded rod can drive the limiting assembly to perform driving treatment, and in addition, the arranged conveying control assembly can enable the laser measuring instrument body to perform angle adjustment treatment; therefore, the bent metal pipe can be conveniently measured.

Description

Technical Field

[0001] The invention relates to the technical field related to metal pipe size measurement, and in particular to a metal pipe size detection device. Background Art

[0002] Metal tube size detection is an important quality control process, which ensures that metal tubes meet specific size and geometric accuracy requirements during manufacturing and use. The existing technology usually uses a laser detection system to detect the size of metal tubes. The laser beam is irradiated on the surface of the metal tube, and the size of the metal tube can be calculated by measuring the reflection of the beam on the tube wall or the beam deviation after passing through the tube wall.

[0003] A laser detection device for the inner wall of a pipeline disclosed in publication number CN108106571U starts from the origin and enters the pipeline along the y-axis. The driving wheel is driven by the second motor to rotate, so that the detection device enters the pipeline smoothly and at a uniform speed. At this time, the first motor starts to work, and through the set program, it is enabled to achieve forward and reverse rotation within a range of 120°, driving the laser displacement sensor to scan the inner wall of the pipeline. By analyzing the laser displacement sensor data and combining the operating status of the first motor and the second motor, the positioning of the defects on the inner wall of the pipeline and the detection of the area and depth are achieved; the above-mentioned device performs auxiliary processing through a crawling mechanism during operation, but when performing auxiliary processing on the metal pipe, especially when measuring the metal pipe after bending, it cannot perform stable crawling, and when the inner wall of the metal pipe is not very large, it cannot effectively detect and process when performing crawling measurement at the bend.

[0004] The laser detection device disclosed in the publication number CN109520423A controls the switching of the laser component and the corresponding grating ruler through a relay. When the device needs to measure a part during operation, it only needs to switch the corresponding relay, so that multiple edges of the product can be measured through one laser component, which can save costs, reduce installation space, and is easy to control. The above device performs detection and processing through a laser component. During the operation, it switches different relays to perform detection and processing on the edges. When detecting a metal tube, in order to ensure the accurate measurement effect, the metal tube needs to be limited. If the metal tube cannot be effectively limited, the measured data may be deviated.

[0005] Therefore, we proposed a metal pipe size detection device to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a metal tube size detection device to solve the problem raised in the above background technology that the laser detection device currently on the market cannot perform stable crawling when performing auxiliary processing on the metal tube, especially when measuring the metal tube after bending, and the inner wall of the metal tube is not very large, and it cannot effectively detect and process when performing crawling measurement at the bend; and if the metal tube cannot be effectively limited, the measured data may be deviated.

[0007] To achieve the above object, the present invention provides the following technical solution: a metal pipe size detection device, comprising a base, the top position of the base is fixed to the bottom center position of a placement rack through two sets of first telescopic rods, and the top center position of the base is fixed to the bottom center position of the placement rack through a supporting mechanism; A set of driving motors is fixedly installed at the left side of the placement rack, the output end of the driving motor is fixed at the left end of the first threaded rod, the outer side of the first threaded rod is threadedly connected to the bottom of the moving seat, and a set of laser measuring instrument bodies is rotatably arranged on the top of the moving seat; A group of limiting components for limiting the inner wall of the metal tube is arranged on the right side of the placement rack, and a group of conveying control components is fixed on the right side of the bottom end of the placement rack. The conveying control components include an air pump. The connecting end of the air pump is connected to the bottom end of the first conveying pipe. The bottom position of the first conveying pipe is connected to the second conveying pipe through a four-way valve.

[0008] Preferably, one end of the second delivery pipe extends into the internal position of the moving seat and is set as a hard pipe, and the second delivery pipe is set on the outside of the moving seat and is set as a soft pipe. A piston rack is tightly fitted inside the hard pipe of the second delivery pipe, and the tooth block on the outside of the piston rack is meshed and connected to the outer position of the rotating gear. The top position of the rotating gear is rotatably connected to the internal position of the moving seat, and the center position of the rotating gear is fixed at the bottom center position of the laser measuring instrument body, so that the laser measuring instrument body can be rotated at an angle.

[0009] Preferably, the interior of the support mechanism includes a rotating threaded sleeve threadedly connected to the center position of the bottom of the placement frame, a group of threaded connection sleeves are threadedly connected to the outer position of the bottom end of the rotating threaded sleeve, a group of rotating rods are rotatably connected to the outer sides of the threaded connection sleeve, and the bottom end of the rotating rod is rotatably connected to the top side position of the end of the extension plate, so that the extension plate can slide stably inside the base.

[0010] Preferably, the outer side of the extension plate is slidably arranged at the bottom of the base, the extension plate forms a sliding structure with the inside of the base through the rotating rod, and the bottom position of the rotating threaded sleeve is rotatably connected to the top center position of the base, so that it can be adjusted through the supporting mechanism.

[0011] Preferably, the interior of the limiting assembly includes a horizontal connecting sleeve threadedly connected to the outer sides of both ends of the second threaded rod, the front and rear ends of the horizontal connecting sleeve are rotatably connected to one end of the support rod, and the other end of the support rod is rotatably set at the end of the bonding plate, and a group of second telescopic rods are set on the inner sides of the two groups of bonding plates, so that the limiting assembly can stably limit the inner wall of the metal tube.

[0012] Preferably, the moving directions of the two groups of horizontal connecting sleeves are relatively arranged, a group of rubber pads for increasing friction are adhered to the outer side of the bonding plate, and the outer side of the bonding plate is bonded to the inner wall of the metal pipe, which can stably limit the inner wall of the metal pipe.

[0013] Preferably, the right end of the first threaded rod and the left end of the second threaded rod are embedded in each other, and the positions where the first threaded rod and the second threaded rod are connected are rotatably set on the inner side of the fixed ring, a group of isolation rings are fixed at the internal position of the fixed ring, a group of accommodating rods are fixed at equal intervals inside the isolation ring, a group of arc-shaped magnetic blocks are slidably fitted inside the accommodating rods, the arc-shaped magnetic blocks are arranged on the outer side of the first threaded rod, and a movable magnetic block is arranged on the outer side of the first threaded rod, and the bottom position of the movable magnetic block is fixed to the outer position of the first threaded rod by a reset spring, and a limiting groove is provided at one end of the second threaded rod extending into the first threaded rod, which can facilitate stable docking between the first threaded rod and the second threaded rod.

[0014] Preferably, a groove is provided on the outer side of the isolation ring, and the interior of the groove is connected to a hollow containing rod, and an arc-shaped magnetic block sliding inside the containing rod is connected to a piston sealingly arranged inside the containing rod, thereby allowing the gas inside the fixed ring to be transported to the internal position of the containing rod.

[0015] Preferably, a group of springs are fixed to the piston arranged on the top of the arc-shaped magnetic block, and the other end of the spring is fitted into the internal position of the accommodating rod. The arc-shaped magnetic block forms an elastic sliding structure with the accommodating rod through the gas transported by the accommodating rod, so that the arc-shaped magnetic block can slide stably inside the fixed ring.

[0016] Preferably, three groups of arc-shaped magnetic blocks are arranged at equal angles inside the fixed ring, and the three groups of arc-shaped magnetic blocks can form a closed circle when closed. The magnetic poles of the arc-shaped magnetic blocks are arranged to be the same as the magnetic poles of the movable magnetic blocks. The magnetic force between the arc-shaped magnetic blocks and the movable magnetic blocks is greater than the elastic force of the reset spring. The movable magnetic blocks form a locking structure with the outer side of the second threaded rod through the limiting groove, so that the second threaded rod and the first threaded rod can be stably docked.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the metal tube size detection device is provided with a limit assembly, and the first threaded rod drives the second threaded rod to rotate, so that the second threaded rod can drive the limit assembly to drive the process, and the bonding plate moves relatively through the second telescopic rod, so as to achieve the limit processing of the inner wall of the metal tube, which is convenient for the limit processing. In addition, the transmission control assembly provided can adjust the angle of the laser measuring instrument body, so as to facilitate the measurement processing of the bent metal tube. The specific contents are shown as follows: 1. A second threaded rod is provided, and two groups of horizontal connecting sleeves provided on the outer side of the second threaded rod move relative to each other, so that the horizontal connecting sleeve slides on the rod outside the placement frame. At this time, the horizontal connecting sleeve drives the bonding plate to move relative to each other through the support rod, and the two groups of bonding plates move relative to each other through the second telescopic rod, so that the outer side of the bonding plate is bonded to the inner wall of the metal pipe, thereby achieving the purpose of limiting the inner wall of the metal pipe; Furthermore, a conveying control component is provided, and the conveying control component conveys gas through the interior of the fixed ring. Since a group of isolating rings are fixed inside the fixed ring, the gas is conveyed to the interior of the accommodating rod through the grooves of the isolating rings. The 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 block, so that the moving magnetic block extends into the inner side of the limiting groove opened inside the second threaded rod, which can facilitate the purpose of rotating and loosening the second threaded rod; 2. A support mechanism is provided, and the top outer side of the rotating threaded sleeve is threadedly connected to the top position of the placement rack, so that the placement rack can be height-adjusted at the top of the base through the first telescopic rod; Furthermore, the threaded connection sleeve threadedly connected to the bottom position of the rotating threaded sleeve will be lowered, so that the threaded connection sleeve will drive the extension plate to move through the rotating rod, so that the extension plate slides inside the base, so that the extension plate can be expanded inside the base, further ensuring stability; 3. A piston rack is provided, and the gas inside the limit groove pushes the piston rack in the sealed connection to move, and 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 rotate at the top position of the moving seat, which can change the angle of the laser measuring instrument body and facilitate the measurement of the bent metal pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a bottom view structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the main structure of the support mechanism of the present invention; Figure 4 This is a schematic diagram of the main structure of the fixing ring of the present invention; Figure 5 This is a schematic diagram of the main cross-sectional structure of the fixing ring of the present invention; Figure 6 It is a partial front view structural schematic diagram of the first threaded rod of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at A in the middle; Figure 8 This is a schematic diagram of the main structure of the limit assembly of the present invention; Fig. 9 For the present invention Figure 1 The enlarged structural diagram at B in the middle; Fig.10 It is a schematic diagram of the cross-sectional structure of the movable seat of the present invention when viewed from above; Fig.11 It is a schematic diagram of the structure of the laser measuring instrument of the present invention after the body is rotated.

[0019] 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. bonding plate; 904. second telescopic rod; 10. conveying control assembly; 1001. first conveying pipe; 1002. second conveying pipe; 1003. piston rack; 11. fixing ring; 12. isolating ring; 13. accommodating rod; 14. arc-shaped magnetic block; 15. moving magnetic block; 16. reset spring; 17. limiting groove; 18. moving seat; 19. rotating gear. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 11 , the present invention provides the following technical solutions: Embodiment 1: In order to solve the problem that the laser detection device on the market cannot stably crawl when performing auxiliary processing on the metal pipe, especially when measuring the bent metal pipe, and the inner wall of the metal pipe is not very large, it cannot effectively detect and process when crawling measurement at the bend, please refer to the attached Figure 1 and attached Fig. 9 -Attached Fig.11 ; It includes a base 1, the top position of the base 1 is fixed to the bottom center position of the placement rack 4 through two groups 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 through a supporting mechanism 3; a group of driving motors 5 are fixedly installed on the left side of the placement rack 4, and the output end position of the driving motor 5 is fixed to the left end position of the first threaded rod 6, the outer side of the first threaded rod 6 is threadedly connected to the bottom position of the moving seat 18, and a group of laser measuring instrument bodies 7 are rotatably arranged on the top of the moving seat 18; a group of limiting components 9 for limiting the inner wall of the metal pipe are arranged on the right side of the placement rack 4, and a group of conveying control components 10 are fixed on the right side of the bottom end of the placement rack 4, and 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, and the bottom position of the first conveying pipe 1001 is connected to the second conveying pipe 1002 through a four-way valve. One end of the second delivery pipe 1002 extends into the internal position of the moving seat 18 and is set as a hard pipe. The second delivery pipe 1002 is set on the outside of the moving seat 18 and is set 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 meshed and connected to the outer position of the rotating gear 19. The top position of the rotating gear 19 is rotatably connected to the internal position of the moving seat 18. The center position of the rotating gear 19 is fixed at the bottom center position of the laser measuring instrument body 7.

[0022] First, the gas is transported to the inside of the second delivery pipe 1002 through the delivery control component 10, and the valve of the first delivery pipe 1001 is closed. The gas inside the second delivery pipe 1002 will push the sealed piston rack 1003 to move. At this time, the outer side of the piston rack 1003 will drive the meshing rotating gear 19 to rotate, causing the rotating gear 19 to rotate inside the moving seat 18. Since the top position of the rotating gear 19 is fixed at the bottom center position of the laser measuring instrument body 7, the laser measuring instrument body 7 can be rotated at the top position of the moving seat 18 at this time, so that the two sides of the fixed bent metal pipe can be detected.

[0023] Embodiment 2: In order to solve the problem that the metal tube cannot be effectively limited, which may cause the measured data to deviate, please refer to the attached Figure 1 , Attachment Figure 2 and attached Figure 4 -Attached Figure 8The 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, and the front and rear ends of the horizontal connecting sleeve 901 are rotatably connected to one end of the support rod 902, and the other end of the support rod 902 is rotatably set at the end of the bonding plate 903, and a group of second telescopic rods 904 are set on the inner sides of the two groups of bonding plates 903. 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 tube. 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 rotatably set on the inner side of the fixed ring 11, and a group of isolation rings 12 are fixed in the internal 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 rod 13, and the arc-shaped magnetic blocks 14 are set on the outer side of the first threaded rod 6, and a movable magnetic block 15 is set on the outer side of the first threaded rod 6. 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 of the second threaded rod 8 extending into the first threaded rod 6. A groove is provided on the outside of the isolation ring 12, and the inside of the groove is connected to the accommodating rod 13, which is hollow. The arc-shaped magnetic block 14 slidingly arranged inside the accommodating rod 13 is connected to the inside of the accommodating rod 13 through a piston arranged in a sealing fit. The piston arranged on the top of the arc-shaped magnetic block 14 is fixed with a group of springs, and the other end of the spring fits in the internal position of the accommodating rod 13. The arc-shaped magnetic block 14 forms an elastic sliding structure with the gas transported by the accommodating rod 13 and the accommodating rod 13. Three groups of arc-shaped magnetic blocks 14 are arranged at equal angles inside the fixed ring 11. When the three groups of arc-shaped magnetic blocks 14 are closed, a closed circle can be formed. The magnetic poles of the arc-shaped magnetic block 14 and the magnetic poles of the moving magnetic block 15 are arranged at the same time. The magnetic force between the arc-shaped magnetic block 14 and the moving magnetic block 15 is greater than the elastic force of the reset spring 16. The moving magnetic block 15 forms a snap-fit ​​structure with the outer side of the second threaded rod 8 through the limiting groove 17. When the inner wall of the metal tube is limited, the conveying control component 10 is started so that the conveying control component 10 will convey the gas through the inside of the fixed ring 11. Since a group of isolation rings 12 are fixed inside the fixed ring 11, the gas will be conveyed to the inside of the accommodating rod 13 through the groove of the isolation ring 12. The arc-shaped magnetic block 14 slidingly arranged inside the accommodating 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 inside the accommodating rod 13. At this time, the three groups of arc-shaped magnetic blocks 14 will form a closed circle, and the arc-shaped magnetic block 14 will be close to one 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 reset spring 16, the reset spring 16 will be squeezed so that the moving magnetic block 15 will extend into the inner side position of the limiting groove 17 opened inside the second threaded rod 8. At this time, when the output end of the drive motor 5 rotates through the first threaded rod 6, the first threaded rod 6 will drive the second The threaded rod 8 rotates, and the first threaded rod 6 and the second threaded rod 8 rotate inside the fixed ring 11. When the second threaded rod 8 rotates, the two groups of horizontal connecting sleeves 901 arranged on the outside of the second threaded rod 8 will move relative to each other, so that the horizontal connecting sleeve 901 slides on the rod outside the placement frame 4. At this time, the horizontal connecting sleeve 901 drives the bonding plate 903 to move relative to each other through the support rod 902. The two groups of bonding plates 903 will move relative to each other through the second telescopic rod 904, so that the outside of the bonding plate 903 will be bonded to the inner wall of the metal pipe. After the internal limit of the metal pipe, the gas supply to the inside of the fixed ring 11 is stopped, and the gas inside the first delivery pipe 1001 is released through the setting of the valve. At this time, the release of gas will cause the arc-shaped magnetic block 14 to be reset by a group of springs fixed by the piston arranged on the top, and the outside of the magnetic block 15 will be separated from the inside of the limiting groove 17, so that the laser measuring instrument body 7 can continue to be moved on the outside of the first threaded rod 6 through the moving seat 18.

[0024] Embodiment 3: To adjust the height of the rack 4, please refer to the attached Figure 1 -Attached Figure 3The interior of the supporting 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 position of the bottom end of the rotating threaded sleeve 301, and a group of rotating rods 303 are rotatably connected to the outer surrounding positions of the threaded connection sleeve 302, and the bottom end of the rotating rod 303 is rotatably connected to the top side position of the end of the extension plate 304. 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 inside 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; the adjustment is carried out by using the supporting mechanism 3, and the rotating threaded sleeve 301 is rotated and the top outer side of the rotating threaded sleeve 301 is threadedly connected to the top position of the placement rack 4, so that the placement rack 4 can be height-adjusted at the top of the base 1 through the first telescopic rod 2, and the threaded connection sleeve 302 threadedly connected to the bottom position of the rotating threaded sleeve 301 will be lowered, so that the threaded connection sleeve 302 will drive the extension plate 304 to move through the rotating rod 303, so that the extension plate 304 slides inside the base 1, thereby increasing the support area of ​​the base 1, ensuring the stability of the base 1 and the placement rack 4.

[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

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 support mechanism (3); Features: 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 arranged at the top of the moving seat (18); A set of limiting components (9) for limiting the inner wall of the metal tube is arranged 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.

2. The metal tube size detection device according to claim 1, characterized in that: One end of the second delivery pipe (1002) extends into the interior of the movable seat (18) and is arranged as a hard pipe. The second delivery pipe (1002) is arranged outside the movable seat (18) and is arranged as a soft pipe. A piston rack (1003) is tightly fitted inside the hard pipe of the second delivery pipe (1002). The tooth block outside 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 inner 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).

3. The metal tube size detection device according to claim 1, characterized in that: The support mechanism (3) comprises 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 position 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).

4. The metal tube size detection device according to claim 3, characterized in that: The outer side of the extension plate (304) is slidably arranged at the bottom of the base (1), the extension plate (304) forms a sliding structure with the inside 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).

5. The metal tube size detection device according to claim 1, characterized in that: The interior of the limit assembly (9) includes a horizontal connection 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 connection sleeve (901) are rotatably connected to one end of a support rod (902); the other end of the support rod (902) is rotatably arranged at the end of a bonding plate (903); and a group of second telescopic rods (904) are arranged at the inner sides of the two groups of bonding plates (903).

6. The metal tube size detection device according to claim 5, characterized in that: The moving directions of the two groups of horizontal connecting sleeves (901) are arranged opposite to each other, 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.

7. The metal tube size detection device according to claim 1, characterized in that: The right end of the first threaded rod (6) and the left end of the second threaded rod (8) are embedded in each other. The positions where the first threaded rod (6) and the second threaded rod (8) are connected are both rotatably arranged on the inner side of the fixed ring (11). A group of isolating rings (12) are fixed inside the fixed ring (11). A group of accommodating rods (13) are fixed inside the isolating rings (12) at equal intervals. A group of arc-shaped magnetic blocks (14) are slidably arranged inside the accommodating rods (13). The arc-shaped magnetic blocks (14) are arranged on the outer side of the first threaded rod (6). A movable magnetic block (15) is arranged on the outer side of the first threaded rod (6). The bottom position of the movable magnetic block (15) is fixed to the outer side of the first threaded rod (6) by a reset spring (16). A limiting groove (17) is provided at one end of the second threaded rod (8) extending into the interior of the first threaded rod (6).

8. The metal tube size detection device according to claim 7, characterized in that: A groove is formed on the outside of the isolation ring (12), and the interior of the groove is connected to a hollow accommodation rod (13). An arc-shaped magnetic block (14) slidably arranged inside the accommodation rod (13) is connected to the interior of the accommodation rod (13) via a piston that is sealed and fitted.

9. The metal tube size detection device according to claim 7, characterized in that: A group of springs are fixed to a piston arranged on the top of the arc-shaped magnetic block (14), and the other end of the spring is fitted in an internal 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).

10. The metal tube size detection device according to claim 7, characterized in that: 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) are arranged to be the same as the magnetic poles of the movable magnetic blocks (15); 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); and the movable magnetic blocks (15) form a snap-fit ​​structure with the outer side of the second threaded rod (8) through the limiting groove (17).

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