A device and method for detecting parameters of external thread of steel pipe based on optical measurement

Abstract

The present invention relates to the technical field of steel pipe thread detection, and in particular to a device and method for detecting parameters of steel pipe external threads based on optical measurement. It comprises: a workbench, the workbench is provided with a second displacement module; an electric shaft, arranged in the second displacement module, the electric shaft is fixedly connected to a first connecting shell, the first connecting shell is fixedly connected to a first L-shaped rod, the first L-shaped rod is fixedly connected to a fixed shell; an electric push rod, arranged in the first connecting shell, the telescopic end of the electric push rod is fixedly connected to a second connecting shell, the second connecting shell is slidably connected to a second L-shaped rod, and the second L-shaped rod is provided with an optical detection module. The present invention detects different positions of the threaded part of the steel pipe, so that the distance between the optical detection module and the different positions of the threaded part of the steel pipe is consistent, so that the optical detection module maintains a good focusing state on the threaded part of the steel pipe, thereby improving the accuracy of the detection result.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe thread detection, and in particular to a device and method for detecting parameters of steel pipe external threads based on optical measurement. Background Art

[0002] Optical measurement is a non-contact detection method that uses the characteristics of light to obtain information such as the size, shape, and position of an object. In industrial manufacturing, optical measurement technology is widely used in quality control and inspection processes because it can provide high-precision data and will not cause damage to the object being measured.

[0003] When inspecting the external threads of steel pipes, optical measuring devices such as line scanning cameras, structured light 3D scanners, and optical cameras are often used to scan the external threads of steel pipes, which can achieve high-precision, fast, and non-contact measurement of thread parameters. However, in actual applications, when using an optical camera to scan the tapered threads on steel pipes, due to the change in the angle of the tapered threads, the distance between the optical camera and different positions of the tapered threads of the steel pipe changes continuously when the optical camera moves axially, making it difficult for the optical camera to maintain a good focusing state, which directly affects the accuracy of the measurement results. Summary of the invention

[0004] In order to overcome the shortcomings mentioned in the above background technology, the present invention provides a device and method for detecting parameters of external threads of steel pipes based on optical measurement.

[0005] The technical solution is: a steel pipe external thread parameter detection device based on optical measurement, comprising:

[0006] A workbench, wherein the workbench is provided with a first displacement module and a support seat, a rotation drive module is provided on the support seat, and the workbench is provided with a second displacement module;

[0007] An electric shaft is arranged on the second displacement module, the electric shaft is fixedly connected to a first connecting shell, the first connecting shell is fixedly connected to a first L-shaped rod, the first L-shaped rod is fixedly connected to a fixed shell, the fixed shell is slidably connected to a connecting rod, and the connecting rod is slidably connected to a rectangular shell;

[0008] An electric push rod is arranged in the first connection shell, the telescopic end of the electric push rod is fixedly connected to the second connection shell, the second connection shell is slidably connected to a second L-shaped rod, and an optical detection module is arranged on a side of the second L-shaped rod away from the second connection shell;

[0009] The U-shaped rod is slidably connected to the second connecting shell, a transmission member is provided between the U-shaped rod and the second L-shaped rod, the U-shaped rod is fixedly connected to a limiting shell, and the limiting shell is slidably connected to the rectangular shell.

[0010] Further explanation includes:

[0011] A U-shaped frame is fixedly connected to the second L-shaped rod, the optical detection module is rotatably connected to the U-shaped frame, a spring distance sensor is slidably connected in the fixed shell, a threaded pin is threadedly connected to the fixed shell, and the threaded pin is used to limit the spring distance sensor in the fixed shell, and the spring distance sensor in the fixed shell is fixedly connected to the connecting rod;

[0012] A detection component, disposed in the rectangular shell, for detecting whether the threads of the steel pipe are damaged;

[0013] The transmission component is arranged on the U-shaped rod and is used to drive the optical detection module to swing.

[0014] Further description, the detection component includes:

[0015] A plurality of sliding blocks are slidably connected to the rectangular shell, and the sliding blocks are provided with through holes;

[0016] The number of sliding posts is the same as that of the sliding blocks, and they are respectively slidably connected in the through holes of the adjacent sliding blocks. A first elastic member is fixedly connected between the sliding posts and the adjacent sliding blocks.

[0017] Further description, the detection component also includes:

[0018] The rotating rod is rotatably connected to the rectangular shell, the sliding block is rotatably connected to the rotating rod, a limit pin is fixed to the sliding block, the rotating rod is provided with spiral grooves with the same number as the sliding block, and the spiral grooves on the rotating rod drive the sliding block to move through the limit pin of the adjacent sliding block.

[0019] Further description, the transmission component includes:

[0020] An elastic oil bag is arranged in the limit shell, a trigger plate is slidably connected in the limit shell, the elastic oil bag is located between the limit shell and the trigger plate, an arc-shaped protrusion is arranged on the trigger plate, the sliding block limits the trigger plate through the arc-shaped protrusion of the trigger plate, and the through hole of the sliding block and the sliding column are used to guide the arc-shaped protrusion of the trigger plate;

[0021] The oil guide pipe is fixedly connected to and communicated with the elastic oil bag and passes through the limiting shell.

[0022] Further description, the sliding block is fixed with two extension plates which are symmetrical about the center point of the through hole thereon, the extension plates on the opposite sides of adjacent sliding blocks contact each other, and the extension plates of the sliding block limit the trigger plate through the arc-shaped protrusion of the trigger plate.

[0023] It is further explained that the size of the through hole on the sliding block is larger than the size of the arc-shaped protrusion of the trigger plate.

[0024] Further description, the transmission component also includes:

[0025] A hydraulic transmission member, fixedly connected to the second L-shaped rod, the hydraulic transmission member being in communication with the oil guide pipe;

[0026] Two liquid holding shells are fixedly connected to one side of the U-shaped frame close to the hydraulic transmission member, the liquid holding shells are sealingly and slidably connected with a sliding rod, and a second elastic member is fixedly connected between the two, the sliding rod is provided with a plurality of oil guide holes, a one-way valve is provided in one of the oil guide holes of the sliding rod, the sliding rod is fixedly connected with an elastic telescopic plate, the telescopic end of the elastic telescopic plate is fixedly connected with a rack, and the rack is fixedly connected with a first extrusion block;

[0027] A second extrusion block, fixedly connected to the telescopic end of the hydraulic transmission member, the second extrusion block being used for extruding the two first extrusion blocks;

[0028] A rotating shaft, rotatably connected to the U-shaped frame, the rotating shaft is fixedly connected with a gear, and the rack is used to drive the gear to rotate;

[0029] The transmission shaft is rotatably connected to the eccentric portion of the rotation shaft. The optical detection module is fixedly connected to a fixing rod, and the fixing rod is limitedly and slidably connected to a limiting column of the transmission shaft.

[0030] It is further explained that there is damping between the rotating shaft and the U-shaped frame.

[0031] A method for using a steel pipe external thread parameter detection device based on optical measurement comprises the following steps:

[0032] Step 1: placing the steel pipe on the first displacement module and controlling the first displacement module to make the threaded portion of the steel pipe pass through the rotation drive module;

[0033] Step 2: Fix the steel pipe by rotating the drive module;

[0034] Step 3: Control the second displacement module to move and align the sliding column with the threaded portion of the steel pipe;

[0035] Step 4: Move the rectangular shell to make the sliding column contact with the threaded portion of the steel pipe to be tested, and make the threaded portion of the steel pipe to be tested squeeze the sliding column to move and compress the first elastic member of the sliding column, rotate the threaded pin, and fix the connecting rod;

[0036] Step 5: Start the rotary drive module and the electric push rod, the steel pipe rotates, and the optical detection module scans the steel pipe;

[0037] Step 6: The sliding block slides along the rectangular shell, and the optical detection module gradually moves away from the steel pipe;

[0038] Step 7: The sliding column enters the notch of the threaded part of the steel pipe or is squeezed by the fleshy part of the threaded part of the steel pipe, driving the rotating shaft and the transmission shaft to rotate, thereby driving the optical detection module to swing;

[0039] Step 8: After the test is completed, turn off the rotary drive module and the electric push rod;

[0040] Step 9: Turn the threaded pin to release the fixation of the connecting rod and move the rectangular shell away from the steel pipe;

[0041] Step 10: Control the second displacement module and the electric push rod to reset;

[0042] Step 11: Release the fixing of the steel pipe by the rotation driving module, and control the first displacement module to move the steel pipe out of the rotation driving module.

[0043] In summary, the beneficial effects of the present invention are as follows: the present invention adapts to different positions of the threaded portion of the steel pipe to be measured and changes the distance between the optical detection module and the different positions of the threaded portion of the steel pipe to be measured, so that the distance between the optical detection module and the different positions of the threaded portion of the steel pipe to be measured remains consistent during the detection process, thereby enabling the optical detection module to maintain a good focusing state on the threaded portion of the steel pipe to be measured, thereby improving the accuracy of the detection result.

[0044] The present invention performs physical inspection on the threaded portion of the steel pipe to be tested. When defects are detected in the threaded portion of the steel pipe to be tested, the optical inspection module is swung to scan the defective area of ​​the threaded portion of the steel pipe to be tested at multiple angles, record more data, and analyze the shortcomings of the production process through data to achieve continuous improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0046] Figure 2 It is a schematic diagram of the three-dimensional structure of the first L-shaped rod and the rectangular shell of the present invention;

[0047] Figure 3 It is a schematic diagram of the three-dimensional structure of the electric rotating shaft and the first connecting shell of the present invention;

[0048] Figure 4 It is a schematic diagram of the three-dimensional structure of the limit housing and the sliding block of the present invention;

[0049] Figure 5 It is a schematic diagram of the three-dimensional structure of the electric push rod and the second connecting shell of the present invention;

[0050] Figure 6 is an exploded view of the second connecting shell of the present invention;

[0051] Figure 7 It is a schematic diagram of the three-dimensional structure of the elastic oil bag and the trigger plate of the present invention;

[0052] Figure 8 It is a schematic diagram of the three-dimensional structure of the sliding block and the sliding column of the present invention;

[0053] Fig. 9 is a cross-sectional view of a rectangular shell and a sliding block of the present invention;

[0054] Fig.10 It is a three-dimensional structural schematic diagram of the sliding block and the rotating rod of the present invention;

[0055] Fig.11 It is a three-dimensional structural schematic diagram of the U-shaped frame and the hydraulic transmission member of the present invention;

[0056] Fig.12 It is a schematic diagram of the three-dimensional structure of the elastic expansion plate and the second extrusion block of the present invention;

[0057] Fig.13 It is a schematic diagram of the three-dimensional structure of the liquid containing shell and the sliding rod of the present invention;

[0058] Fig.14 It is a schematic diagram of the three-dimensional structure of the rotating shaft and the fixing rod of the present invention.

[0059] In the accompanying drawings: 1: workbench, 2: first displacement module, 3: support seat, 4: rotation drive module, 5: second displacement module, 6: electric rotating shaft, 7: first connecting shell, 8: first L-shaped rod, 9: fixed shell, 901: connecting rod, 902: threaded pin, 10: rectangular shell, 11: electric push rod, 12: second connecting shell, 13: second L-shaped rod, 14: optical detection module, 15: U-shaped rod, 16: limit shell, 17: U-shaped frame, 18: sliding block, 19: sliding column, 20: rotating rod, 21: elastic oil bag, 22: trigger plate, 23: oil guide pipe, 24: hydraulic transmission part, 25: liquid holding shell, 2501: sliding rod, 26: elastic telescopic plate, 27: rack, 28: first extrusion block, 29: second extrusion block, 30: rotating shaft, 31: gear, 32: transmission shaft, 33: fixed rod. DETAILED DESCRIPTION

[0060] The present invention will now be described more fully below with reference to the accompanying drawings, in which currently preferred embodiments of the present invention are shown. However, the present invention may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and these embodiments fully convey the scope of the present invention to the skilled person.

[0061] Embodiment 1: A device for detecting parameters of external thread of a steel pipe based on optical measurement, such as Figure 1-Figure 6 As shown, it includes: a workbench 1, the workbench 1 is provided with a first displacement module 2 and a support seat 3, the support seat 3 is provided with a rotation drive module 4, and the workbench 1 is provided with a second displacement module 5; an electric shaft 6, which is arranged on the second displacement module 5, the electric shaft 6 is fixedly connected to a first connecting shell 7, the first connecting shell 7 is fixedly connected to a first L-shaped rod 8, the first L-shaped rod 8 is fixedly connected to a fixed shell 9, the fixed shell 9 is slidably connected to a connecting rod 901, and the connecting rod 901 is slidably connected to a rectangular shell 10; an electric push rod 11, which is arranged in the first connecting shell 7, the telescopic end of the electric push rod 11 is fixedly connected to a second connecting shell 12, the second connecting shell 12 is slidably connected to a second L-shaped rod 13, and an optical detection module 14 is arranged on the side of the second L-shaped rod 13 away from the second connecting shell 12; a U-shaped rod 15, which is slidably connected to the second connecting shell 12, a transmission member is arranged between the U-shaped rod 15 and the second L-shaped rod 13, the U-shaped rod 15 is fixedly connected to a limiting shell 16, and the limiting shell 16 is slidably connected to the rectangular shell 10.

[0062] In the above scheme, the workbench 1 is provided with a control terminal, the first displacement module 2 is provided with a plurality of roller brackets, the first displacement module 2 is used to support the steel pipe to be tested and drive the steel pipe to be tested to move, the support seat 3 is used to change the height and inclination of the rotation drive module 4, the rotation drive module 4 is provided with a clamp for clamping the steel pipe to be tested, the first displacement module 2, the support seat 3, the rotation drive module 4, the second displacement module 5, the electric shaft 6, and the electric push rod 11 are all electrically connected to the control terminal of the workbench 1, the second displacement module 5 can change the height of the first connecting shell 7 and the parts thereon, and the transmission between the U-shaped rod 15 and the second L-shaped rod 13 The moving parts are configured as gears and racks, the U-shaped rod 15 and the second L-shaped rod 13 are both fixedly connected with racks, the second connecting shell 12 is rotatably connected with a gear, the gear of the second connecting shell 12 and the racks on the U-shaped rod 15 and the second L-shaped rod 13 are all meshed, so that the U-shaped rod 15 moves through the transmission member between it and the second L-shaped rod 13 to drive the second L-shaped rod 13 to move in the opposite direction, the axis of the rectangular shell 10 and the conical surface of the threaded part of the steel pipe to be tested are in a parallel state with the generatrix close to the rectangular shell 10, the optical detection module 14 is an existing optical camera, which is used to scan the external thread of the steel pipe, and the optical detection module 14 and the control terminal of the workbench 1 transmit information through electrical signals.

[0063] like Figure 3 and Figure 4As shown, it also includes: a U-shaped frame 17, fixedly connected to the second L-shaped rod 13, the optical detection module 14 is rotatably connected to the U-shaped frame 17, a spring distance sensor is slidably connected in the fixed shell 9, the fixed shell 9 is threadedly connected with a threaded pin 902, the threaded pin 902 is used to limit the spring distance sensor in the fixed shell 9, and the spring distance sensor in the fixed shell 9 is fixedly connected to the connecting rod 901; a detection component is arranged in the rectangular shell 10, and is used to detect whether the steel pipe thread is damaged; a transmission component is arranged on the U-shaped rod 15, and is used to drive the optical detection module 14 to swing.

[0064] In the above solution, the opening of the U-shaped frame 17 faces the steel pipe to be tested, and the optical detection module 14 swings left and right on the U-shaped frame 17 in a direction parallel to the horizontal plane.

[0065] like Figure 3 , Figure 4 and Figure 8 As shown, the detection component includes: a plurality of sliding blocks 18, all of which are slidably connected to the rectangular shell 10, and a through hole is opened on the sliding block 18; sliding columns 19, the number of which is the same as the number of sliding blocks 18, which are respectively slidably connected to the through holes of adjacent sliding blocks 18, and a first elastic member is fixed between the sliding column 19 and the adjacent sliding block 18.

[0066] In the above solution, the first elastic member between the sliding column 19 and the adjacent sliding block 18 is configured as a spring, and the first elastic member of the sliding column 19 is used to drive the sliding column 19 to reset.

[0067] like Figure 4 and Figure 8-Figure 10 As shown, the detection component also includes: a rotating rod 20, which is rotatably connected to the rectangular shell 10, and the sliding block 18 is rotatably connected to the rotating rod 20. A limit pin is fixed to the sliding block 18, and the rotating rod 20 is provided with spiral grooves with the same number as the sliding block 18. The spiral grooves on the rotating rod 20 drive the sliding block 18 to move through the limit pins on the adjacent sliding block 18.

[0068] In the above scheme, a rotating disk can be installed on the rotating rod 20 to facilitate the rotation of the rotating rod 20. The pitch of the spiral groove on the rotating rod 20 increases in a step-by-step manner from the side close to the limit shell 16 to the side away from the limit shell 16, so that the spiral groove on the rotating rod 20 drives the sliding block 18 to move through the upper limit pin of the sliding block 18, while ensuring that all sliding blocks 18 are always arranged at equal intervals.

[0069] like Figure 4 , Figure 5 and Figure 7As shown, the transmission component includes: an elastic oil bag 21, which is arranged in the limiting shell 16, and a trigger plate 22 is slidably connected in the limiting shell 16. The elastic oil bag 21 is located between the limiting shell 16 and the trigger plate 22. The trigger plate 22 is provided with an arc-shaped protrusion. The sliding block 18 limits the trigger plate 22 through the arc-shaped protrusion of the trigger plate 22. The through hole of the sliding block 18 and the sliding column 19 are both used to guide the arc-shaped protrusion of the trigger plate 22. The size of the through hole on the sliding block 18 is larger than the size of the arc-shaped protrusion of the trigger plate 22; an oil guide pipe 23, which is fixedly connected and connected to the elastic oil bag 21 and passes through the limiting shell 16. The sliding block 18 is fixedly connected to two extension plates that are symmetrical about the center point of the through hole thereon. The extension plates on the opposite sides of the adjacent sliding blocks 18 contact each other, and the extension plate of the sliding block 18 limits the trigger plate 22 through the arc-shaped protrusion of the trigger plate 22.

[0070] In the above scheme, hydraulic oil is filled in the elastic oil bag 21, and the elastic oil bag 21 is initially in a compressed state. The elastic oil bag 21 is restricted by the trigger plate 22. When the trigger plate 22 moves, the elastic oil bag 21 expands or contracts to change its own volume. The size of the through hole on the sliding block 18 is larger than the size of the arc-shaped protrusion that triggers the trigger plate 22, so that the trigger plate 22 can move in the direction of the sliding block 18. The oil guide pipe 23 is filled with hydraulic oil, and the extension plate of the sliding block 18 is used to ensure that the trigger plate 22 remains stable during the movement.

[0071] like Figure 11-Figure 14 As shown, the transmission assembly also includes: a hydraulic transmission member 24, which is fixedly connected to the second L-shaped rod 13, and the hydraulic transmission member 24 is connected to the oil guide pipe 23; two liquid storage shells 25, which are both fixedly connected to the side of the U-shaped frame 17 close to the hydraulic transmission member 24, and the liquid storage shells 25 are sealed and slidably connected to the sliding rod 2501, and a second elastic member is fixedly connected between the two, and a plurality of oil guide holes are provided on the sliding rod 2501, and a one-way valve is provided in one of the oil guide holes of the sliding rod 2501, and the sliding rod 2501 is fixedly connected to the elastic telescopic plate 26, and the telescopic end of the elastic telescopic plate 26 is fixedly connected to the rack 27, the rack 27 is fixedly connected with a first extrusion block 28; the second extrusion block 29 is fixedly connected to the telescopic end of the hydraulic transmission member 24, and the second extrusion block 29 is used to extrude the two first extrusion blocks 28; the rotating shaft 30 is rotatably connected to the U-shaped frame 17, and there is damping between the rotating shaft 30 and the U-shaped frame 17. The rotating shaft 30 is fixedly connected with a gear 31, and the rack 27 is used to drive the gear 31 to rotate; the transmission shaft 32 is rotatably connected to the eccentric part of the rotating shaft 30, and the optical detection module 14 is fixedly connected with a fixed rod 33, and the fixed rod 33 is limitedly slidably connected with the limit column of the transmission shaft 32.

[0072] In the above scheme, the hydraulic transmission member 24 is composed of a hydraulic shell and a piston rod. The piston part of the piston rod of the hydraulic transmission member 24 is initially located in the middle of the hydraulic shell of the hydraulic transmission member 24, so that the telescopic end of the hydraulic transmission member 24 can be retracted or extended. The hydraulic transmission member 24 and the liquid storage shell 25 are both filled with hydraulic oil. The second elastic member between the liquid storage shell 25 and the sliding rod 2501 is set as a spring, and is initially in a power storage state, which is used to drive the sliding rod 2501 to reset. The flow direction of the one-way valve in the oil guide hole of the sliding rod 2501 is from the side close to the elastic telescopic plate 26 to the side away from the elastic telescopic plate 26, which is used to slow down the speed of the sliding rod 2501 to reset after moving out of the liquid storage shell 25. The first extrusion block 28 is provided with an inclined surface, and the second extrusion block 29 is provided with an inclined surface. Two inclined surfaces are arranged on the upper surface. In the initial state, the two inclined surfaces of the second extrusion block 29 are respectively fitted with the inclined surfaces of the adjacent first extrusion blocks 28, and under the extrusion of the second extrusion block 29 on the two first extrusion blocks 28, the telescopic end of the elastic telescopic plate 26 is in a contracted state, so that the rack 27 and the gear 31 are in a separated state. When the telescopic end of the elastic telescopic plate 26 is extended, the rack 27 is driven to engage with the gear 31. The damping between the rotating shaft 30 and the U-shaped frame 17 is used to make the rotating shaft 30 rotate slowly and uniformly. The rotation of the rotating shaft 30 drives the transmission shaft 32 to rotate along the axis of the rotating shaft 30. The transmission shaft 32 rotates under the restriction of the fixed rod 33 and slides relatively with the fixed rod 33, thereby driving the optical detection module 14 to swing through the fixed rod 33.

[0073] When using the device to detect the external thread of a steel pipe, the staff transfers the steel pipe to be tested to the first displacement module 2, and then controls the first displacement module 2 to move rightward, and the first displacement module 2 drives the steel pipe to be tested to move rightward until the threaded portion of the steel pipe to be tested passes through the rotation drive module 4, and then stops the first displacement module 2, and then fixes the steel pipe to be tested by the clamping claw on the rotation drive module 4, and then controls the second displacement module 5, and the second displacement module 5 drives the parts on it to move leftward until the rightmost sliding column 19 is aligned with the thread of the steel pipe to be tested. After the starting ends of the steel pipes to be tested are aligned, the second displacement module 5 is closed, and then the rectangular shell 10 is moved. The rectangular shell 10 drives all the sliding columns 19 to move in the direction close to the steel pipe to be tested, so that the sliding columns 19 are blocked by the threaded portion of the steel pipe to be tested and push the sliding columns 19 to slide into the sliding block 18. The sliding columns 19 move to compress the first elastic member thereon until the side of the sliding column 19 located in the sliding block 18 is flush with the side of the sliding block 18 away from the steel pipe to be tested (the sliding column 19 fills the through hole of the adjacent sliding block 18), and then the rectangular shell 10 is stopped.

[0074] When the rectangular shell 10 moves, it synchronously drives the connecting rod 901 and the spring distance sensor on the connecting rod 901 to move. After the rectangular shell 10 stops moving, the staff rotates the threaded pin 902 to fix the spring distance sensor of the fixed shell 9. After the spring distance sensor is fixed, the connecting rod 901 is fixed relative to the U-shaped rod 15 through the supporting force provided by the spring distance sensor thereon. Then the staff starts the rotation drive module 4 and the optical detection module 14, and drives the steel pipe to be tested to rotate through the rotation drive module 4 (the threaded portion of the steel pipe to be tested rotates and rubs against the sliding column 19, and drives the rectangular shell 10 to move slowly to the left through the sliding column 19 and the sliding block 18, so that the rectangular shell 10 and the connecting rod 901 slide relative to each other). During the rotation of the steel pipe to be tested, the optical detection module 14 scans and records the thread parameters of the steel pipe to be tested.

[0075] After both the rotation drive module 4 and the optical detection module 14 are started, the staff starts the electric push rod 11 again, so that the telescopic end of the electric push rod 11 extends out and drives the second connecting shell 12 and the parts thereon to move to the left, and the second connecting shell 12 moves to drive the limit shell 16 to slide on the rectangular shell 10. During the movement of the limit shell 16, the limit shell 16 is gradually moved in the direction away from the steel pipe to be measured by the angle restriction of the rectangular shell 10. At this time, the limit shell 16 drives the U-shaped rod 15 to slide in the second connecting shell 12, and the U-shaped rod 15 moves through the transmission member between it and the second L-shaped rod 13 to drive the second L-shaped rod 13 to move in the direction away from the steel pipe to be measured. The movement of the second L-shaped rod 13 drives the optical detection module 14 to move in the direction away from the steel pipe to be measured. During the process of the electric push rod 11 driving the optical detection module 14 to scan the threaded portion of the steel pipe to be measured, the distance between the optical detection module 14 and the threaded portion of the steel pipe to be measured is kept consistent to avoid the optical detection module 14 from losing focus during the movement and affecting the accuracy of the final data scanning of the threaded portion of the steel pipe to be measured.

[0076] During the sliding process of the limit shell 16 on the rectangular shell 10, the limit shell 16 drives the trigger plate 22 to slide on the sliding block 18. At this time, the sliding column 19 adjacent to the sliding block 18 fills the through hole on the sliding block 18, so that the trigger plate 22 can always be in a stable state during the movement. If the threaded portion of the steel pipe to be tested is damaged (here refers to the gap or fleshy situation), the sliding column 19 contacts the gap of the steel pipe threaded portion when passing through the gap of the steel pipe threaded portion. The sliding column 19 moves into the gap of the steel pipe threaded portion under the elastic force of the first elastic member thereon. After the movement, the sliding column 19 releases the filling of the through hole on the adjacent sliding block 18, so that when the trigger plate 22 passes here, the arc-shaped protrusion on the trigger plate 22 passes through the through hole on the sliding block 18, and the sliding column 19 releases the limit on the arc-shaped protrusion on the trigger plate 22. Then the elastic oil bag 21 expands under the action of its own elasticity and pushes the trigger plate 22 to move, so that the arc-shaped protrusion of the trigger plate 22 enters the through hole on the sliding block 18.

[0077] When the elastic oil bag 21 expands, the elastic oil bag 21 draws the hydraulic oil in the hydraulic transmission member 24 into the inside of the elastic oil bag 21 through the oil guide pipe 23, so that the telescopic end of the hydraulic transmission member 24 is retracted, so that the telescopic end in the hydraulic transmission member 24 drives the second extrusion block 29 to move rightward, and the movement of the second extrusion block 29 drives the first extrusion block 28 on the lower side to move rightward, so as to drive the rack 27 and the elastic telescopic plate 26 on the lower side to move rightward, and the elastic telescopic plate 26 moves rightward and drives the sliding rod 2501 on the lower side to move rightward, and the hydraulic oil on the right side of the sliding rod 2501 in the liquid storage shell 25 flows to the left side of the sliding rod 2501 through the one-way valve and the oil guide hole on the sliding rod 2501. On the other hand, when the second extrusion block 29 moves to the right, the second extrusion block 29 releases the extrusion of the first extrusion block 28 on the upper side, so that the extrusion of the telescopic end of the upper elastic telescopic plate 26 by the upper first extrusion block 28 through the rack 27 disappears, and the telescopic end of the elastic telescopic plate 26 extends out under the action of its own elasticity and drives the upper rack 27 to temporarily engage with the gear 31 until the steel pipe to be tested squeezes the sliding column 19 out of the threaded portion thereof, so that the sliding column 19 moves into the sliding block 18 again and fills the through hole of the sliding block 18. At this time, the sliding column 19 moves to squeeze out the arc-shaped protrusion of the trigger plate 22 in the sliding block 18 and compresses the first elastic member of the sliding block 18 again.

[0078] After the sliding column 19 moves to squeeze out the arc-shaped protrusion of the trigger plate 22 in the sliding block 18, the trigger plate 22 moves to compress the elastic oil bag 21, so that the hydraulic oil in the elastic oil bag 21 flows back to the hydraulic transmission member 24 through the oil guide pipe 23. The hydraulic pressure flowing back into the hydraulic transmission member 24 will push the telescopic end of the hydraulic transmission member 24 to extend, so that the telescopic end of the hydraulic transmission member 24 drives the second extrusion block 29 to move and reset. The second extrusion block 29 resets to release the extrusion of the lower first extrusion block 28, and at the same time squeezes the upper first extrusion block 28, so that the upper first extrusion block 28 drives the upper rack 27 to engage and disengage with the gear 31, and compresses the telescopic end of the upper elastic telescopic plate 26 again.

[0079] The second squeezing block 29 releases the squeezing of the first squeezing block 28 on the lower side, and the telescopic end of the lower elastic telescopic plate 26 extends out under the action of its own elasticity and drives the lower rack 27 and the first squeezing block 28 to move upward, so that the lower rack 27 is meshed with the gear 31. During the extension of the telescopic end of the lower elastic telescopic plate 26, the sliding rod 2501 is reset to the left under the elastic force of the second elastic member thereon. During the reset of the sliding rod 2501, the one-way valve thereon is in a blocked state, so that the hydraulic oil in the liquid storage shell 25 can only flow through the oil guide hole of the sliding rod 2501 to reset, and the moving speed of the sliding rod 2501 is reduced, so that the moving speed of the sliding rod 2501 is lower than that of the hydraulic transmission member 2 4. In the process of resetting the sliding rod 2501, the sliding rod 2501 drives the gear 31 to rotate through the rack 27, and the gear 31 rotates through the rotating shaft 30 to drive the transmission shaft 32 to rotate along the axis of the rotating shaft 30. The transmission shaft 32 drives the optical detection module 14 to swing back and forth on the U-shaped frame 17 through the fixing rod 33. The optical detection module 14 is swung to scan the damaged threaded portion of the steel pipe to be tested at multiple angles until the elastic force of the second elastic member of the elastic expansion plate 26 is completely released and drives the elastic expansion plate 26 to reset and stop. At this time, the optical detection module 14 stops swinging, and the above action is repeated in the area where the threaded portion of the steel pipe to be tested is damaged.

[0080] If the threaded portion of the steel pipe is too fleshy during the inspection of the threaded portion of the steel pipe to be tested, the sliding column 19 is affected by the threaded portion of the steel pipe and moves toward the direction close to the fixed shell 9, and compresses the first elastic member of the sliding column 19, so that the part of the sliding column 19 close to the fixed shell 9 is located outside the through hole of the sliding block 18. At this time, when the trigger plate 22 passes by, the sliding column 19 squeezes the trigger plate 22 toward the direction close to the elastic oil bag 21, so that the trigger plate 22 further compresses the elastic oil bag 21. After the elastic oil bag 21 is squeezed, the hydraulic oil in it enters the hydraulic transmission member 24 through the oil guide pipe 23, so that the telescopic end of the hydraulic transmission member 24 extends. At the same time, it drives the second extrusion block 29 to move leftward. The second extrusion block 29 moves leftward and first drives the rack 27 to move leftward through the first extrusion block 28 on its upper side, so that the upper sliding rod 2501 moves leftward. The hydraulic oil in the liquid holding shell 25 flows through the oil guide hole and the one-way valve on the sliding rod 2501. The sliding rod 2501 compresses the second elastic member thereon. At the same time, the elastic telescopic plate 26 on the lower side drives the rack 27 on the lower side to engage with the gear 31. After the sliding column 19 is out of contact with the fleshy part of the threaded portion of the steel pipe, the sliding column 19 moves under the action of the first elastic member thereon to a state where it fills the through hole of the sliding block 18.

[0081] The sliding column 19 moves to release the squeeze on the trigger plate 22. The elastic oil bag 21 expands under its own elastic force and pushes the trigger plate 22 to move. The expansion of the elastic oil bag 21 withdraws the hydraulic pressure in the hydraulic transmission member 24, so that the telescopic end of the hydraulic transmission member 24 is retracted and reset, so that the second squeezing block 29 releases the squeezing of the upper first squeezing block 28 and squeezes the lower first squeezing block 28 again, so that the lower rack 27 is out of mesh with the gear 31. After the squeezing of the first squeezing block 28 disappears, the elastic telescopic plate 26 moves in a self- Under the action of its own elasticity, the rack 27 is pushed downward, so that the rack 27 is engaged with the gear 31, the elastic force of the second elastic member on the sliding rod 2501 is released, and the rack 27 is pushed to the right through the sliding rod 2501, so that the rack 27 drives the gear 31 to rotate, and the hydraulic oil in the liquid holding shell 25 flows through the oil guide hole on the sliding rod 2501 to reset, and the rotation of the gear 31 drives the optical detection module 14 to swing through the rotating shaft 30, the transmission shaft 32 and the fixed rod 33, and the fleshy area of ​​the threaded part of the steel pipe to be tested is scanned at multiple angles.

[0082] After the optical detection module 14 has finished scanning the threaded portion of the steel pipe to be tested, the staff first turns off the rotary drive module 4 and the electric push rod 11, and then rotates the threaded pin 902 to release the fixation of the spring distance sensor in the fixed shell 9, so that the spring distance sensor in the fixed shell 9 releases the fixation of the rectangular shell 10, and then moves the rectangular shell 10 away from the steel pipe to be tested, so that the squeezing of the steel pipe threaded portion on the sliding column 19 is released, and the elastic force of the first elastic member on the sliding column 19 is released and drives the sliding column 19 to move and reset, until the rectangular shell 10 is moved to the initial position and stops. Then the staff starts the second displacement module 5 and the electric push rod 11. The second displacement module 5 moves to the right and resets. The telescopic end of the electric push rod 11 is retracted to drive the second connecting shell 12 and the parts thereon to move and reset. The second displacement module 5 and the telescopic end of the electric push rod 11 stop after they are reset. Then the fixing of the steel pipe by the clamp of the rotation drive module 4 is released, and the first displacement module 2 is started. The first displacement module 2 drives the steel pipe to move to the left until the steel pipe moves out of the rotation drive module 4. Then the first displacement module 2 is stopped and the steel pipe is transferred. The above steps are repeated when the steel pipe is tested again later.

[0083] When inspecting steel pipes with different thread pitches, the staff first rotates the rotating rod 20 while moving. The rotating rod 20 rotates so that the spiral groove on it drives all the sliding blocks 18 to move synchronously to the left or right through the limit pin of the sliding block 18, so that the sliding block 18 drives the respective adjacent sliding columns 19 to move synchronously, and finally the sliding column 19 can adapt to steel pipes with different thread pitches, thereby improving the applicability of the sliding column 19 and accelerating the inspection efficiency of the steel pipe thread.

[0084] If the threaded portion of the steel pipe is slightly bent relative to the steel pipe during the manufacturing or transportation process, after the preparation work is completed, the rotation drive module 4 is started to drive the steel pipe to rotate, and the threaded portion of the steel pipe will swing slightly. At this time, the threaded portion of the steel pipe squeezes the sliding column 19, causing the sliding column 19 to move away from the steel pipe, and compresses the first elastic members thereon to different degrees, among which the first elastic member on the sliding column 19 close to the right side has the largest compression amplitude. Then the force of the sliding column 19 is directly applied to the rectangular shell 10, causing the rectangular shell 10 to move away from the steel pipe. The movement of the rectangular shell 10 drives the connecting rod 901 to move, and the connecting rod 901 squeezes the spring distance sensor between it and the fixed shell 9. The spring distance sensor of the fixed shell 9 records the distance moved by the rectangular shell 10.

[0085] After the rectangular shell 10 moves, the staff closes the rotation drive module 4, and controls the rotation drive module 4 to bend the threaded part of the steel pipe downward according to the data transmitted by the spring distance measuring sensor of the fixed shell 9, and then controls the support seat 3 to drive the rotation drive module 4 to move upward, and at the same time makes the rotation drive module 4 swing to the left, so that the rotation drive module 4 straightens the threaded part of the steel pipe, and then lifts the parts on it through the second displacement module 5 to align with the central axis of the threaded part of the steel pipe (the sliding column 19 is aligned with the central axis of the threaded part), and then starts the electric shaft 6 and the electric push rod 11, and drives the first connecting shell 7 to rotate through the electric shaft 6, and the rotation of the first connecting shell 7 drives the first L-shaped rod 8 and the electric push rod 11 to rotate, so that the parts on the first L-shaped rod 8 and the electric push rod 11 rotate around the threaded part of the steel pipe, and then the telescopic end of the electric push rod 11 extends to drive the parts on it to detect the threaded part of the steel pipe (consistent with the above action), and it can still be detected when the threaded part of the steel pipe is not straight.

[0086] Embodiment 2: Based on embodiment 1, Figure 1-Figure 14 As shown, a method for using a steel pipe external thread parameter detection device based on optical measurement includes the following steps:

[0087] Step 1: placing the steel pipe on the first displacement module 2 and controlling the first displacement module 2 to make the threaded portion of the steel pipe pass through the rotation drive module 4;

[0088] Step 2: Fix the steel pipe by rotating the driving module 4;

[0089] Step 3: Control the second displacement module 5 to move and align the sliding column 19 with the threaded portion of the steel pipe;

[0090] Step 4: Move the rectangular shell 10 to make the sliding column 19 contact with the threaded portion of the steel pipe to be tested, and make the threaded portion of the steel pipe to be tested squeeze the sliding column 19 to move and compress the first elastic member of the sliding column 19, rotate the threaded pin 902, and fix the connecting rod 901;

[0091] Step 5: Start the rotation drive module 4 and the electric push rod 11, the steel pipe rotates, and the optical detection module 14 scans the steel pipe;

[0092] Step 6: The sliding block 18 slides along the rectangular shell 10, and the optical detection module 14 gradually moves away from the steel pipe;

[0093] Step 7: The sliding post 19 enters the notch of the threaded portion of the steel pipe or is squeezed by the fleshy portion of the threaded portion of the steel pipe, driving the rotating shaft 30 and the transmission shaft 32 to rotate, thereby driving the optical detection module 14 to swing;

[0094] Step 8: After the detection is completed, the rotary drive module 4 and the electric push rod 11 are turned off;

[0095] Step 9: Rotate the threaded pin 902 to release the fixation of the connecting rod 901 and move the rectangular shell 10 away from the steel pipe;

[0096] Step 10: Control the second displacement module 5 and the electric push rod 11 to reset;

[0097] Step 11: Release the fixing of the steel pipe by the rotation driving module 4 , and control the first displacement module 2 to move the steel pipe out of the rotation driving module 4 .

[0098] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A steel pipe external thread parameter detection device based on optical measurement, characterized in that it includes: A workbench (1), the workbench (1) being provided with a first displacement module (2) and a support seat (3), the support seat (3) being provided with a rotation drive module (4), and the workbench (1) being provided with a second displacement module (5); An electric rotating shaft (6) is arranged on the second displacement module (5), the electric rotating shaft (6) is fixedly connected to a first connecting shell (7), the first connecting shell (7) is fixedly connected to a first L-shaped rod (8), the first L-shaped rod (8) is fixedly connected to a fixed shell (9), the fixed shell (9) is slidably connected to a connecting rod (901), and the connecting rod (901) is slidably connected to a rectangular shell (10); An electric push rod (11) is arranged in the first connecting shell (7); the telescopic end of the electric push rod (11) is fixedly connected to the second connecting shell (12); the second connecting shell (12) is slidably connected to a second L-shaped rod (13); and an optical detection module (14) is arranged on a side of the second L-shaped rod (13) away from the second connecting shell (12); A U-shaped rod (15) is slidably connected to the second connecting shell (12), a transmission member is provided between the U-shaped rod (15) and the second L-shaped rod (13), the U-shaped rod (15) is fixedly connected to a limiting shell (16), and the limiting shell (16) is slidably connected to the rectangular shell (10); A U-shaped frame (17) is fixedly connected to the second L-shaped rod (13), and the optical detection module (14) is rotatably connected to the U-shaped frame (17); A plurality of sliding blocks (18) are all slidably connected to the rectangular shell (10), and a through hole is formed on the sliding blocks (18); Sliding columns (19), the number of which is the same as the number of the sliding blocks (18), and are respectively slidably connected to the through holes of adjacent sliding blocks (18); An elastic oil bag (21) is arranged in the limiting shell (16), and a trigger plate (22) is slidably connected in the limiting shell (16); The trigger plate (22) is provided with an arc-shaped protrusion; An oil guide pipe (23) fixedly connected to and in communication with the elastic oil bag (21) and passing through the limiting shell (16); A hydraulic transmission component (24) is fixedly connected to the second L-shaped rod (13), and the hydraulic transmission component (24) is in communication with the oil guide pipe (23); Two liquid storage shells (25) are fixedly connected to one side of the U-shaped frame (17) close to the hydraulic transmission member (24); the liquid storage shells (25) are sealingly and slidably connected to a sliding rod (2501), and a second elastic member is fixedly connected between the two; and a plurality of oil guide holes are provided on the sliding rod (2501); The sliding rod (2501) is fixedly connected to an elastic telescopic plate (26), the telescopic end of the elastic telescopic plate (26) is fixedly connected to a rack (27), and the rack (27) is fixedly connected to a first extrusion block (28); A second extrusion block (29) is fixedly connected to the telescopic end of the hydraulic transmission member (24); A rotating shaft (30) is rotatably connected to the U-shaped frame (17); a gear (31) is fixedly connected to the rotating shaft (30); and the rack (27) is used to drive the gear (31) to rotate; The transmission shaft (32) is rotatably connected to an eccentric portion of the rotating shaft (30), and the optical detection module (14) is fixedly connected to a fixing rod (33).

2. According to the optical measurement-based steel pipe external thread parameter detection device of claim 1, it is characterized in that include: A spring distance sensor is slidably connected in the fixed shell (9), a threaded pin (902) is threadedly connected to the fixed shell (9), the threaded pin (902) is used to limit the spring distance sensor in the fixed shell (9), and the spring distance sensor in the fixed shell (9) is fixedly connected to the connecting rod (901); A detection component, arranged in the rectangular shell (10), used to detect whether the threads of the steel pipe are damaged; A transmission component is arranged on the U-shaped rod (15) and is used to drive the optical detection module (14) to swing.

3. A steel pipe external thread parameter detection device based on optical measurement according to claim 2, characterized in that: The detection component comprises: A first elastic member is fixedly connected between the sliding column (19) and the adjacent sliding block (18).

4. A steel pipe external thread parameter detection device based on optical measurement according to claim 3, characterized in that: The detection component also includes: A rotating rod (20) is rotatably connected to the rectangular shell (10); the sliding block (18) is rotatably connected to the rotating rod (20); a limit pin is fixedly connected to the sliding block (18); the rotating rod (20) is provided with spiral grooves having the same number as the sliding block (18); the spiral grooves on the rotating rod (20) drive the sliding block (18) to move via the limit pin of the adjacent sliding block (18).

5. A steel pipe external thread parameter detection device based on optical measurement according to claim 4, characterized in that: The transmission component includes: The elastic oil bag (21) is located between the limiting shell (16) and the trigger plate (22); the sliding block (18) limits the trigger plate (22) via the arc-shaped protrusion of the trigger plate (22); and the through hole of the sliding block (18) and the sliding column (19) are used to guide the arc-shaped protrusion of the trigger plate (22).

6. A steel pipe external thread parameter detection device based on optical measurement according to claim 5, characterized in that: The sliding block (18) is fixedly connected to two extension plates which are symmetrical about the center point of the through hole thereon, the extension plates on the opposite sides of adjacent sliding blocks (18) contact each other, and the extension plates of the sliding block (18) limit the trigger plate (22) through the arc-shaped protrusion of the trigger plate (22).

7. A steel pipe external thread parameter detection device based on optical measurement according to claim 6, characterized in that: The size of the through hole on the sliding block (18) is greater than the size of the arc-shaped protrusion of the trigger plate (22).

8. A steel pipe external thread parameter detection device based on optical measurement according to claim 7, characterized in that: The transmission component also includes: A one-way valve is provided in one of the oil guide holes of the sliding rod (2501), and the second extrusion block (29) is used to extrude the two first extrusion blocks (28); The fixing rod (33) is connected to the limiting post of the transmission shaft (32) in a limiting sliding manner.

9. A steel pipe external thread parameter detection device based on optical measurement according to claim 8, characterized in that: Damping exists between the rotating shaft (30) and the U-shaped frame (17).

10. A method for using a steel pipe external thread parameter detection device based on optical measurement, which is completed by using the steel pipe external thread parameter detection device based on optical measurement as claimed in claim 9, and the specific steps are as follows: The first step is to place the steel pipe on the first displacement module (2) and control the first displacement module (2) so that the threaded portion of the steel pipe passes through the rotation drive module (4); Step 2: Fix the steel pipe by rotating the driving module (4); Step 3: Control the second displacement module (5) to move so that the sliding column (19) is aligned with the threaded portion of the steel pipe; Step 4: Move the rectangular shell (10) so that the sliding column (19) contacts the threaded portion of the steel pipe to be tested, and make the threaded portion of the steel pipe to be tested squeeze the sliding column (19) to move and compress the first elastic member of the sliding column (19), rotate the threaded pin (902), and fix the connecting rod (901); Step 5: Start the rotation drive module (4) and the electric push rod (11), the steel pipe rotates, and the optical detection module (14) scans the steel pipe; Step 6: The sliding block (18) slides along the rectangular shell (10), and the optical detection module (14) gradually moves away from the steel pipe; Step 7: The sliding column (19) enters the notch of the threaded portion of the steel pipe or the sliding column (19) is squeezed by the fleshy portion of the threaded portion of the steel pipe, driving the rotating shaft (30) and the transmission shaft (32) to rotate, thereby driving the optical detection module (14) to swing; Step 8: After the test is completed, the rotary drive module (4) and the electric push rod (11) are turned off; Step 9: Rotate the threaded pin (902) to release the fixing of the connecting rod (901) and move the rectangular shell (10) away from the steel pipe; Step 10: Control the second displacement module (5) and the electric push rod (11) to reset; Step 11: Release the fixing of the steel pipe by the rotation driving module (4), and control the first displacement module (2) to move the steel pipe out of the rotation driving module (4).

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