A detection device for detecting the straightness of the inner hole of a steel pipe

Abstract

The present application relates to a detection device for detecting the straightness of the inner hole of a steel pipe, which includes a detection frame and a laser rangefinder. A fixed rail is provided above the detection frame, a detection slot is provided on the fixed rail, a mounting plate is connected to the detection frame, a support frame is connected to the detection frame, the fixed rail is connected between the mounting plate and the support frame, a movable plate is slidably fitted on the fixed rail, the laser rangefinder is connected to the movable plate, a driving member for driving the movable plate to move is provided on the detection frame, a mounting assembly is provided on the detection frame, the mounting assembly includes a fixed seat, a movable seat, a support wheel, a mounting frame and a pressure wheel, the fixed seat and the movable seat are both provided on the detection frame, two support wheels are rotatably connected on the fixed seat and the movable seat, one mounting frame is connected to the fixed seat and the movable seat, a pressure wheel is provided on the mounting frame and is located above the support wheel, and a lifting assembly for driving the pressure wheel to rise and fall is provided on the mounting frame. The present application has the effect of improving the detection accuracy of the detection device.

Description

Technical Field

[0001] The present application relates to the technical field of detection devices, and in particular to a detection device for detecting the straightness of the inner hole of a steel pipe. Background Art

[0002] After processing large steel pipes, in order to ensure that the straightness of the inner hole of the steel pipe reaches a reasonable value, the inner hole of the steel pipe needs to be tested for straightness, so a device for testing the straightness of the inner hole of the steel pipe is needed.

[0003] Chinese patent publication number CN106839949A discloses a steel pipe straightness detection device comprising a base plate and, above the base plate, a cylinder, a linear guide pair, a V-shaped support block, a dial indicator bracket, a digital dial indicator, and a control box. The cylinder is positioned in front of one end of the base plate, the control box is positioned behind one end of the base plate, the linear guide pair is positioned in front of the other end of the base plate, and the V-shaped support block is positioned behind the other end of the base plate. The dial indicator bracket is positioned above the linear guide pair, and the digital dial indicator is connected to the upper end of the dial indicator bracket, with the center of the lower end of the digital dial indicator aligned with the center of the V-shaped support block. During use, the cylinder drives the digital dial indicator to slide, and the digital dial indicator measures the straightness of the steel pipe in real time during the sliding process. The present invention is easy to use, simple to operate, has a wide range of practical applications, high detection accuracy, low investment cost, and high production efficiency.

[0004] With regard to the above-mentioned related technologies, in the prior art, the steel pipe is placed on a V-shaped support block, and then the digital dial indicator is pressed against the surface of the steel pipe. The connecting block is driven to move by a cylinder to drive the digital dial indicator to move, thereby realizing the effect of detecting the straightness of the steel pipe. However, in the prior art, the steel pipe is directly placed on the V-shaped support block, and no means are set to limit the vibration or movement of the steel pipe. If the straightness error of the steel pipe itself is high and it cannot be completely fitted into the two V-shaped support blocks, there is a possibility that the steel pipe will shake or move during detection by the digital dial indicator. In this way, the data measured by the digital dial indicator will have errors, which reduces the detection accuracy of the detection device. Summary of the Invention

[0005] In order to improve the detection accuracy of the detection device, the present application provides a detection device for detecting the straightness of the inner hole of a steel pipe.

[0006] The present application provides a detection device for detecting the straightness of the inner hole of a steel pipe, which adopts the following technical solutions:

[0007] 7. The swiftly and minutely adjusting device for detecting the straightness of an inner hole of a steel pipe as claimed in claim 1, wherein the fixing rail is provided above the detection frame, the fixing rail is provided with a detection slot, the detection frame is connected to a mounting plate, the detection frame is detachably connected to a support frame, the fixed rail is connected between the mounting plate and the support frame, a movable plate is slidably fitted on the fixed rail, the laser rangefinder is connected to the movable plate, and the detection end of the laser rangefinder passes through the detection slot, the detection frame is provided with a driving member for driving the movable plate to move, and the detection frame is provided with a mounting assembly, the mounting assembly comprises a fixed seat, a movable seat, a supporting wheel, a mounting frame and a pressure wheel, the fixed seat and the movable seat are both provided on the detection frame, the supporting wheels are rotatably connected to two on the fixed seat and the movable seat, the mounting frame is connected to one on the fixed seat and the movable seat, the pressure wheel is provided on the mounting frame and is located above the support wheel, and the mounting frame is provided with a lifting assembly for driving the pressure wheel to rise and fall.

[0008] By adopting the above technical solution, during installation, the steel pipe is placed on the support wheel, the fixed rail passes through the inner hole of the steel pipe, and the support frame is installed on the other end of the fixed rail. Finally, the lifting assembly is used to drive the pressure wheel down to press against the top of the steel pipe to restrain the steel pipe. During testing, the driving member drives the movable plate to move, so that the laser rangefinder moves inside the steel pipe to detect the change in the distance between the laser rangefinder and the inner wall of the steel pipe, thereby achieving the effect of detecting the straightness of the steel pipe. By installing the assembly to restrict the freedom of the steel pipe, the possibility of the steel pipe moving or shaking during testing is reduced. Compared with the existing technology, the detection error of the steel pipe straightness is reduced and the detection accuracy of the detection device is improved.

[0009] Optionally, an extension rail is provided at the other end of the fixed rail, and the extension rail is detachably connected between the support frame and the fixed rail. The detection frame is provided with a first limiting component for limiting the movement of the support frame, and the movable seat is slidably fitted on the detection frame, and the detection frame is provided with a second limiting component for limiting the movement of the movable seat.

[0010] By adopting the above technical solution and arranging the extension rail, the detection device can be adapted to the detection of steel pipes of different lengths, thereby improving the applicability of the detection device.

[0011] Optionally, several positioning blocks are connected to one end of the extension rail and the side wall of the support frame, and the positioning blocks are rectangular blocks. The positioning blocks on the extension rail are inserted into the other end of the fixed rail, and the positioning blocks on the support frame are inserted into the end of the extension rail.

[0012] By adopting the above technical solution, when installing the extension rail, the positioning block on the extension rail is inserted into the other end of the fixed rail, and then the positioning block on the support frame is inserted into the end of the extension rail to limit the degree of automation of the extension rail. Finally, the first limiting component is used to limit the support frame to realize the installation of the extension rail.

[0013] Optionally, the first limiting component includes a fixing frame, a pressure block, an extrusion block, a pushing bolt and a return spring, the fixing frame is connected to one on both sides of the support frame, the pressure block is slidably fitted on the fixing frame, the pushing bolt is threadedly fitted on the fixing frame and is rotatably connected to the pressure block, the pressure block is provided with a pressure inclined surface, and the thickness of the pressure block gradually increases from bottom to top as a reference direction, a sliding groove is provided on the side wall of the support frame, a stop block is provided at the notch of the sliding groove, a sliding block is connected to the extrusion block, the sliding block slidably fits in the sliding groove, the return spring is provided in the sliding groove and is located between the sliding block and the stop block, and the extrusion block is in contact with the pressure inclined surface.

[0014] By adopting the above technical solution, when limiting the support frame, the support frame is slidably fitted on the detection frame until the positioning block on the support frame is inserted into the end of the extension rail, and then the pushing bolt is rotated to move the pressure block, and the extrusion block is lowered through the pressure inclined surface, and the return spring is compressed until the extrusion block presses the detection frame, thereby limiting the degree of freedom of the support frame and realizing the installation of the support frame; when disassembling, the pushing bolt is rotated in the opposite direction, the pressure block moves in the opposite direction, and the extrusion block rises under the action of the return spring to separate from the detection frame, thereby realizing the effect of loading and unloading the support frame.

[0015] Optionally, the second limiting assembly includes a rotating plate, a limiting frame and a limiting rail, one end of the rotating plate is rotatably connected to one end of the movable seat, a plurality of mounting slots are provided on the detection frame, one limiting rail is connected to each side of the mounting slot, the limiting rail is vertically arranged, the limiting frame slides between the two limiting rails, a limiting rod is provided on the limiting frame, and a limiting notch matching the shape of the limiting rod is provided on the rotating plate. When limiting the movable seat, the rotating plate is located in the mounting slot, and the limiting rod is located in the limiting notch.

[0016] By adopting the above technical solution, when limiting the movable seat, the rotating plate is flipped so that the rotating plate enters the installation groove, and then the limiting frame is lowered until the limiting rod is embedded in the limiting notch. Since the moving path of the limiting notch is different from the moving path of the limiting rod, the freedom of the rotating plate is limited, thereby achieving the effect of limiting the movement of the movable seat.

[0017] Optionally, the mounting frame includes a fixed part and a rotating part, and the fixed part and the rotating part are both L-shaped. The fixed part is connected to one on the fixed seat and the movable seat. One end of the rotating part is rotatably connected to the other end of the fixed part. A limiting right angle is provided at one end of the rotating part. A limiting plate is rotatably connected to the rotating part, and the limiting plate fits the side wall of the rotating part. The pressure wheel and the lifting assembly are both arranged on the rotating part. When installing the steel pipe, the limiting plate is fitted between the fixed part and the rotating part, and the limiting right angle contacts the other end of the fixed part.

[0018] By adopting the above technical solution, by setting up a fixed part and a rotating part, when placing the steel pipe, the rotating part can be lowered to free up more space for steel pipe installation, which is convenient for steel pipe installation. When restricting the steel pipe, the combination of the limiting plate and the limiting right angle is utilized to limit the rotation of the rotating part. The operation is convenient and quick, which improves the applicability of the mounting frame and further improves the steel pipe installation efficiency of the detection device.

[0019] Optionally, the lifting assembly includes a lifting column, a rotating ring and a limiting block, a lifting hole is opened on the rotating part, the limiting block is connected to the inner wall of the lifting hole, the lifting column slides in the lifting hole, a limiting groove is opened on the surface of the lifting column along its length direction, the limiting block slides in the limiting groove, the pressure wheel is connected to the end of the lifting column close to the support wheel, the rotating ring is rotatably connected to the rotating part, and is threadedly engaged with the lifting column.

[0020] By adopting the above technical solution, when the pressure wheel is raised or lowered, the rotating ring is toggled, and the lifting column is lowered in its original state through the cooperation between the limiting block and the limiting groove and the cooperation between the rotating ring and the lifting column, thereby driving the pressure wheel to lower, thereby achieving the effect of raising and lowering the pressure wheel.

[0021] Optionally, the driving member is a linear motor, the driving member is connected to the detection frame, the output direction of the driving member is parallel to the fixed rail, and a connecting rod is connected between the output end of the driving member and the movable plate.

[0022] By adopting the above technical solution, the linear motor has high precision positioning, stability and corresponding speed, so that the laser rangefinder can move smoothly and at low speed, and the moving distance of the laser rangefinder can be adjusted according to needs, thereby improving the mobile controllability of the laser rangefinder.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. During installation, place the steel pipe on the support wheel, pass the fixed rail through the inner hole of the steel pipe, install the support frame on the other end of the fixed rail, and finally use the lifting assembly to drive the pressure wheel down to press against the top of the steel pipe to limit the steel pipe; during testing, the driving member drives the moving plate to move the laser rangefinder inside the steel pipe to detect the change in the distance between the laser rangefinder and the inner wall of the steel pipe, thereby achieving the effect of testing the straightness of the steel pipe. By installing the assembly to limit the freedom of the steel pipe, the possibility of the steel pipe moving or shaking during testing is reduced. Compared with the existing technology, the detection error of the steel pipe straightness is reduced and the detection accuracy of the detection device is improved;

[0025] 2. When limiting the support frame, slide the support frame onto the detection frame until the positioning block on the support frame is inserted into the end of the extension rail, then rotate the pushing bolt to move the pressure block, which lowers the extrusion block through the pressure inclined surface, compressing the return spring until the extrusion block presses the detection frame, thereby limiting the degree of freedom of the support frame and achieving the installation of the support frame; when disassembling, rotate the pushing bolt in the opposite direction, the pressure block moves in the opposite direction, and the extrusion block rises under the action of the return spring to separate from the detection frame, and the support frame can be disassembled;

[0026] 3. When limiting the movement of the seat, flip the rotating plate so that the rotating plate enters the installation groove, and then lower the limiting frame until the limiting rod is embedded in the limiting notch. Since the moving path of the limiting notch is different from the moving path of the limiting rod, the freedom of the rotating plate is limited, thereby achieving the effect of limiting the movement of the movable seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the detection device in the embodiment of the present application.

[0028] Figure 2 It is a structural diagram of the installation components in an embodiment of the present application.

[0029] Figure 3 It is an exploded view used to illustrate the extended rail structure in the embodiment of the present application.

[0030] Figure 4 It is an exploded view used to illustrate the structure of the first restriction component in the embodiment of the present application.

[0031] Figure 5 It is a cross-sectional view used to illustrate the structure of the first limiting component in the embodiment of the present application.

[0032] Figure 6 It is an exploded view used to illustrate the installation component structure in the embodiment of the present application.

[0033] Figure 7 It is an exploded view used to illustrate the structure of the lifting assembly in the embodiment of the present application.

[0034] Figure 8It is a cross-sectional view used to illustrate the structure of the lifting assembly in the embodiment of the present application.

[0035] Figure 9 It is an exploded view used to illustrate the structure of the second restriction component in the embodiment of the present application.

[0036] Explanation of reference numerals: 1. Detection frame; 11. Fixed rail; 111. Extension rail; 12. Mounting plate; 13. Support frame; 14. Positioning block; 15. Moving plate; 151. Connecting rod; 16. Laser rangefinder; 17. Driving member; 18. Mounting slot; 19. Controller; 191. Display screen; 192. Control button; 2. First limiting assembly; 21. Fixed frame; 22. Pressure block; 221. Pressure ramp; 23. Extrusion block; 231. Sliding block; 24. Push bolt; 25. Reset Spring; 3. Mounting assembly; 31. Fixed seat; 311. Rotating motor; 32. Moving seat; 33. Support wheel; 34. Mounting frame; 341. Fixed portion; 342. Rotating portion; 3421. Limiting right angle; 3422. Limiting plate; 35. Pressure wheel; 4. Lifting assembly; 41. Lifting column; 411. Limiting groove; 42. Rotating ring; 43. Limiting block; 5. Second limiting assembly; 51. Rotating plate; 511. Limiting notch; 52. Limiting frame; 521. Limiting rod; 53. Limiting rail. DETAILED DESCRIPTION

[0037] The following is combined with Figures 1-9 This application is described in further detail.

[0038] The present application discloses a detection device for detecting the straightness of the inner hole of a steel pipe. Figure 1 、 Figure 2 and Figure 3 The detection device for detecting the straightness of the inner hole of a steel pipe includes a detection frame 1, a fixed rail 11 is provided above the detection frame 1, a detection groove is opened on the fixed rail 11 along its length direction, and a mounting plate 12 is fixedly connected to the detection frame 1, and one end of the fixed rail 11 is fixedly connected to the mounting plate 12.

[0039] Reference Figure 2 and Figure 3, an extension rail 111 is provided at the other end of the fixed rail 11, and the shape of the extension rail 111 is consistent with that of the fixed rail 11. A support frame 13 is provided on the detection frame 1, and a first T-block is fixedly connected to the support frame 13. The support frame 13 slides with the detection frame 1 through the first T-block, and the extension rail 111 is located between the support frame 13 and the fixed rail 11. Several positioning blocks 14 are fixedly connected to one end of the extension rail 111 and the support frame 13. The positioning blocks 14 are rectangular blocks. In this embodiment, two blocks are taken as an example. The positioning block 14 on the extension rail 111 is inserted into the other end of the fixed rail 11, and the positioning block 14 on the support frame 13 is inserted into the end of the extension rail 111. A movable plate 15 is slidably fitted between the fixed rail 11 and the extension rail 111, and a laser rangefinder 16 is installed on the movable plate 15. The detection end of the laser rangefinder 16 faces downward and passes through the detection slot. The detection frame 1 is provided with a driving member 17 , which is a linear motor. The output direction of the driving member 17 is parallel to the fixed rail 11 . A connecting rod 151 is fixedly connected between the output end of the driving member 17 and the movable plate 15 , and the connecting rod 151 passes through the mounting plate 12 .

[0040] Reference Figure 4 and Figure 5 , a first limiting component 2 is provided on the detection frame 1, and the first limiting component 2 includes a fixed frame 21, a pressure block 22, an extrusion block 23, a pushing bolt 24 and a reset spring 25. The fixed frame 21 is set in an L shape, and one is fixedly connected to each side of the support frame 13, and the pressure block 22 slides in the fixed frame 21. A pressure inclined surface 221 is provided on the pressure block 22, and the thickness of the pressure block 22 gradually decreases from top to bottom as a reference direction. The pushing bolt 24 is threadedly fitted on the fixed frame 21 and is rotatably connected to the pressure block 22. A sliding groove is provided on the side wall of the support frame 13, and a stopper is fixedly connected to the notch of the sliding groove. A sliding block 231 is fixedly connected to the extrusion block 23, and the extrusion block 23 slides with the sliding groove through the sliding block 231, and the extrusion block 23 fits the pressure inclined surface 221. The reset spring 25 is provided in the sliding groove and is located between the sliding block 231 and the stopper.

[0041] When limiting the support frame 13, the first T-block is slidably fitted on the detection frame 1, and then the pushing bolt 24 is rotated to move the pressure block 22, the extrusion block 23 is lowered, and the return spring 25 is compressed until the extrusion block 23 presses the detection frame 1, thereby limiting the movement of the support frame 13; when loosening, the pushing bolt 24 is rotated in the opposite direction, the pressure block 22 moves in the opposite direction, and the extrusion block 23 is lifted by the force of the return spring 25 to separate from the detection frame 1, thereby realizing the loading and unloading of the support frame 13.

[0042] Reference Figure 2 and Figure 6The detection frame 1 is provided with a mounting assembly 3, which includes a fixed seat 31, a movable seat 32, a support wheel 33, a mounting frame 34, and a pressure wheel 35. The fixed seat 31 is fixedly connected to the detection frame 1, and a plurality of second T-shaped blocks are fixedly connected to the movable seat 32. In this embodiment, two blocks are used as an example. The movable seat 32 slides with the detection frame 1 through the second T-shaped blocks. Two support wheels 33 are rotatably connected to each other on the movable seat 32 and the fixed seat 31. A rotating motor 311 is installed on the fixed seat 31, and the rotating motor 311 is coaxially connected to one of the support wheels 33.

[0043] Reference Figure 6 The mounting bracket 34 includes a fixed portion 341 and a rotating portion 342. Both the fixed portion 341 and the rotating portion 342 are L-shaped. The fixed portion 341 is fixedly connected to both the fixed seat 31 and the movable seat 32. One end of the rotating portion 342 is rotatably connected to the fixed portion 341. One end of the rotating portion 342 is provided with a limiting right angle 3421. A limiting plate 3422 is rotatably connected to the rotating portion 342, and the limiting plate 3422 is in contact with the side wall of the rotating portion 342.

[0044] Reference Figure 6 、 Figure 7 and Figure 8 The pressure wheel 35 is mounted on the rotating portion 342, which is equipped with a lifting assembly 4 comprising a lifting column 41, a rotating ring 42, and a limiting block 43. A lifting hole is defined in the rotating portion 342, and the limiting block 43 is fixedly connected within the lifting hole. The lifting column 41 is inserted into the lifting hole, and a limiting groove 411 is defined along its length. The limiting block 43 slidably engages with the limiting groove 411. The pressure wheel 35 is mounted on the end of the lifting column 41 near the support wheel 33. The rotating ring 42 is rotatably connected to the rotating portion 342 and is threadedly engaged with the lifting column 41.

[0045] Reference Figure 2 and Figure 9 A second limiting assembly 5 is provided between the detection frame 1 and the movable base 32. The second limiting assembly 5 comprises a rotating plate 51, a limiting frame 52, and a limiting rail 53. One end of the rotating plate 51 is rotatably connected to one end of the movable base 32. A plurality of mounting slots 18 are provided on one side of the detection frame 1 along its length. A limiting rail 53 is provided on each side of the mounting slot 18. The limiting rail 53 is vertically fixedly connected to the detection frame 1. The limiting rail 53 is a T-shaped rail, and a supporting block is fixedly connected to the bottom end of the limiting rail 53. The limiting frame 52 is slidably fitted between the two limiting rails 53. A limiting rod 521 is provided on the limiting frame 52, and a limiting notch 511 matching the shape of the limiting rod 521 is provided on the rotating plate 51.

[0046] When limiting the movable seat 32, the rotating plate 51 is flipped over so that the rotating plate 51 enters the installation groove 18, and then the limiting frame 52 is lowered so that the limiting rod 521 enters the limiting notch 511, thereby limiting the freedom of the movable seat 32 and achieving the effect of limiting the movement of the movable seat 32.

[0047] When installing the steel pipe, place the steel pipe on the supporting wheel 33, and the steel pipe is attached to the mounting plate 12. At this time, the fixed rail 11 and the extension rail 111 are located inside the steel pipe. Then flip the rotating part 342 so that the limiting right angle 3421 is attached to the fixed part 341, flip the limiting plate 3422, and the limiting plate 3422 is attached to the rotating part 342 and the side wall of the fixed part 341. Then rotate the rotating ring 42 to lower the lifting column 41, driving the pressure wheel 35 to lower until the pressure wheel 35 presses the top of the steel pipe to achieve the installation of the steel pipe.

[0048] Reference Figure 1 、 Figure 2 and Figure 6 In order to better control the detection device, a controller 19 is fixedly connected to the detection frame 1. The controller 19 is provided with a display screen 191 and a control button 192. The rotating motor 311, the laser rangefinder 16, the driving member 17 and the control button 192 are all electrically connected to the controller 19.

[0049] The implementation principle of the detection device for detecting the straightness of the inner hole of a steel pipe in an embodiment of the present application is as follows: when installing the steel pipe, the steel pipe is placed on the support wheel 33, and then the support frame 13 is slidably fitted on the detection frame 1, so that the positioning block 14 on the support frame 13 is inserted into the end of the extension rail 111, and the pushing bolt 24 is rotated to move the pressure block 22, and the extrusion block 23 is lowered until it is pressed against the detection frame 1 to limit the support frame 13, and then the rotating part 342 is flipped so that the limiting right angle 3421 contacts the fixed part 341, and the limiting plate 3422 is flipped so that the limiting plate 3422 fits the rotating part 342 and the fixed part 341, and finally the rotating ring 42 is rotated, the lifting column 41 is lowered, and the pressure wheel 35 is driven to descend until the pressure wheel 35 presses the steel pipe, thereby realizing the installation of the steel pipe.

[0050] During detection, the driving member 17 is started, and the laser rangefinder 16 is turned on by pressing the control button 192. The driving member 17 is started, and the movable plate 15 is pulled to move, so that the laser rangefinder 16 moves inside the steel pipe. The specific value measured by the laser rangefinder 16 is displayed on the display screen 191. Then, the rotating motor 311 is started to rotate the support wheel 33, driving the steel pipe to rotate a certain angle, and then the value is measured by the above method. In this way, the straightness values ​​of multiple steel pipe angles are measured, and the average value is taken to achieve the effect of detecting the straightness of the steel pipe.

[0051] By installing component 3 to limit the freedom of the steel pipe, the possibility of the steel pipe moving or shaking during detection is reduced. Compared with the existing technology, the detection error of the steel pipe straightness is reduced and the detection accuracy of the detection device is improved.

[0052] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A detection device for detecting the straightness of the inner hole of a steel pipe, characterized by: The invention comprises a detection frame (1) and a laser rangefinder (16), wherein a fixed rail (11) is provided above the detection frame (1), a detection slot is provided on the fixed rail (11), a mounting plate (12) is connected to the detection frame (1), a support frame (13) is detachably connected to the detection frame (1), the fixed rail (11) is connected between the mounting plate (12) and the support frame (13), a movable plate (15) is slidably fitted on the fixed rail (11), the laser rangefinder (16) is connected to the movable plate (15), and a detection end of the laser rangefinder (16) passes through the detection slot, and a driving mechanism for driving the movable plate (15) to move is provided on the detection frame (1). The detection frame (1) is provided with a mounting assembly (3), the mounting assembly (3) comprising a fixed seat (31), a movable seat (32), a support wheel (33), a mounting frame (34) and a pressure wheel (35), the fixed seat (31) and the movable seat (32) are both provided on the detection frame (1), the support wheel (33) is rotatably connected to two on the fixed seat (31) and the movable seat (32), the mounting frame (34) is connected to one on the fixed seat (31) and the movable seat (32), the pressure wheel (35) is provided on the mounting frame (34) and is located above the support wheel (33), the mounting frame (34) A lifting assembly (4) for driving the pressure wheel (35) to rise and fall is provided on the detection frame (11); an extension rail (111) is provided at the other end of the fixed rail (11); the extension rail (111) is detachably connected between the support frame (13) and the fixed rail (11); a first limiting assembly (2) for limiting the movement of the support frame (13) is provided on the detection frame (1); the movable seat (32) is slidably fitted on the detection frame (1); a second limiting assembly (5) for limiting the movement of the movable seat (32) is provided on the detection frame (1); the second limiting assembly (5) includes a rotating plate (51), a limiting frame (52) and a limiting rail (53); the rotating plate (51) One end is rotatably connected to one end of the movable seat (32); a plurality of mounting grooves (18) are provided on the detection frame (1); one of the limiting rails (53) is connected to both sides of the mounting groove (18); the limiting rails (53) are vertically arranged; the limiting frame (52) is slidably fitted between the two limiting rails (53); a limiting rod (521) is provided on the limiting frame (52); a limiting notch (511) matching the shape of the limiting rod (521) is provided on the rotating plate (51); when limiting the movable seat (32), the rotating plate (51) is located in the mounting groove (18), and the limiting rod (521) is located in the limiting notch (511);The mounting frame (34) includes a fixed portion (341) and a rotating portion (342), and the fixed portion (341) and the rotating portion (342) are both L-shaped. The fixed portion (341) is connected to one of the fixed seat (31) and the movable seat (32). One end of the rotating portion (342) is rotatably connected to the other end of the fixed portion (341). One end of the rotating portion (342) is provided with a limiting right angle (3421). A limiting plate (3422) is rotatably connected to the rotating portion (342), and the limiting plate (3422) is attached to the side wall of the rotating portion (342). The pressure wheel (35) and the lifting assembly (4) are both arranged on the rotating portion (342). When the steel pipe is installed, the limiting plate (3422) is attached between the fixed portion (341) and the rotating portion (342), and the limiting right angle (3421) contacts the other end of the fixed portion (341).

2. The detection device for detecting the straightness of the inner hole of a steel pipe according to claim 1, characterized in that: A plurality of positioning blocks (14) are connected to one end of the extension rail (111) and the side wall of the support frame (13). The positioning blocks (14) are rectangular blocks. The positioning blocks (14) on the extension rail (111) are inserted into the other end of the fixed rail (11), and the positioning blocks (14) on the support frame (13) are inserted into the end of the extension rail (111).

3. The detection device for detecting the straightness of the inner hole of a steel pipe according to claim 1, characterized in that: The first limiting assembly (2) includes a fixing frame (21), a pressure block (22), an extrusion block (23), a pushing bolt (24) and a return spring (25), wherein the fixing frame (21) is connected to one of the two sides of the support frame (13), the pressure block (22) is slidably fitted on the fixing frame (21), the pushing bolt (24) is threadedly fitted on the fixing frame (21) and is rotatably connected to the pressure block (22), and the pressure block (22) is provided with a pressure inclined surface (221 ), with the reference direction from bottom to top, the thickness of the pressure block (22) gradually increases, a sliding groove is provided on the side wall of the support frame (13), a stop block is provided at the notch of the sliding groove, a sliding block (231) is connected to the extrusion block (23), the sliding block (231) is slidably fitted in the sliding groove, the return spring (25) is provided in the sliding groove and is located between the sliding block (231) and the stop block, and the extrusion block (23) is in contact with the pressure inclined surface (221).

4. The detection device for detecting the straightness of the inner hole of a steel pipe according to claim 1, characterized in that: The lifting assembly (4) includes a lifting column (41), a rotating ring (42) and a limiting block (43); a lifting hole is provided on the rotating portion (342); the limiting block (43) is connected to the inner wall of the lifting hole; the lifting column (41) is slidably fitted in the lifting hole; a limiting groove (411) is provided on the surface of the lifting column (41) along its length direction; the limiting block (43) is slidably fitted in the limiting groove (411); the pressure wheel (35) is connected to the end of the lifting column (41) close to the supporting wheel (33); the rotating ring (42) is rotatably connected to the rotating portion (342) and is threadedly fitted with the lifting column (41).

5. The detection device for detecting the straightness of the inner hole of a steel pipe according to claim 1, characterized in that: The driving member (17) is a linear motor, the driving member (17) is connected to the detection frame (1), the output direction of the driving member (17) is parallel to the fixed rail (11), and a connecting rod (151) is connected between the output end of the driving member (17) and the movable plate (15).

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