A steel pipe straightness detection device

Abstract

The utility model provides a kind of steel pipe straightness detection device, including workbench and the drive mechanism on workbench, clamping detection mechanism, the clamping detection mechanism includes moving assembly and is located on the fixed assembly of workbench, to be measured steel pipe is clamped between moving assembly and fixed assembly, moving assembly is driven to the detection part of fixed assembly by drive mechanism and advances to-be-measured steel pipe, to realize step by step all-around detection.The utility model has the advantages of: compact structure design, convenient operation, improve measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe testing technology, specifically to a steel pipe straightness testing device. Background Technology

[0002] Steel pipe is a type of steel with a hollow cross-section, where its axial dimension is much larger than its radial dimension. Due to its hollow structure, it can achieve a lighter weight under the same strength conditions. Steel pipe is widely used for fluid and powdery solid transportation (such as long-distance pipeline transportation of media such as oil, natural gas, slurry, and grain), heat energy exchange (heating surfaces or heat transfer elements in boilers, heat exchangers, and condensers), mechanical parts and engineering structures (drive shafts, hydraulic supports, scaffolding, and space frame nodes), pressure vessels and storage tanks (liquefied petroleum gas cylinders, high-pressure gas cylinders, and petrochemical reactors), etc.

[0003] With the rapid growth in demand for large-diameter, thick-walled pipes for long-distance oil and gas pipelines, deep-sea risers, and ultra-supercritical power plant boilers, the outer diameter of steel pipes has expanded from the traditional φ10 mm to φ600 mm to φ1422 mm and even over φ2000 mm, and the wall thickness has correspondingly increased to 50 mm to 100 mm. In applications with ultra-large diameters and ultra-thick walls, the straightness of the steel pipe becomes a key indicator determining its service performance and safety margin. Excessive straightness deviation can generate additional bending moments during welding and installation of long-distance pipelines, inducing stress concentration in the weld and reducing fatigue life. In machining, excessive straightness can lead to datum offsets in subsequent turning, boring, and honing processes, reducing machining accuracy. In heat exchange equipment, bent pipe sections can disrupt the medium flow field, increase pressure drop, and induce vibration and noise.

[0004] Currently, the industry mainly uses the following methods to inspect the straightness of steel pipes: a) Platform feeler gauge method: The steel pipe is placed on a marble inspection platform, manually rotated, and the maximum gap is measured with a feeler gauge. This method is only suitable for small-diameter, short-length pipes, and is inefficient and prone to human error; b) Wire method: A reference steel wire is set at the end of the pipe, and the vertical distance between the outer wall of the pipe and the wire is measured. Although the device is simple, the weight of the steel wire, environmental vibration, and reading errors all reduce the inspection accuracy; c) Laser collimation method: A laser emitter-receiver array is used to scan the inner hole or outer wall of the pipe to obtain a high-resolution straightness curve. However, this method has inherent limitations for large-diameter steel pipes (≥φ800 mm): insufficient support span (most existing V-shaped or roller support designs are φ600 mm). For pipe diameters below mm, when supporting large-diameter steel pipes, the arc length of the roller contact with the pipe wall decreases, forming a "point contact" or "line contact", resulting in a sharp drop in support stiffness; dynamic swaying (due to insufficient support stability, the steel pipe is prone to low-frequency swaying during rotation or axial movement, causing "pseudo-bending" in the contour data collected by the laser probe, thereby reducing the accuracy of straightness calculation); reference drift (the support system itself lacks sufficient structural damping, and external disturbances such as ground micro-vibration and crane impact will be transmitted to the steel pipe through the support seat, causing real-time drift of the laser reference).

[0005] In summary, existing technologies generally suffer from technical bottlenecks in large-diameter steel pipe straightness testing scenarios, namely "poor support stability → measurement benchmark drift → decreased testing accuracy." There is an urgent need for a support device and its matching testing system that can take into account ultra-large pipe diameter, high load-bearing capacity, high damping, and low deformation, in order to overcome the above-mentioned defects. Utility Model Content

[0006] The purpose of this invention is to provide a steel pipe straightness testing device with a compact structure, convenient operation, and improved measurement accuracy.

[0007] To achieve the above objectives, this utility model employs the following technical solution: A steel pipe straightness testing device includes a worktable and a drive mechanism and a clamping testing mechanism on the worktable. The clamping testing mechanism includes a moving component and a fixed component disposed on the worktable. The steel pipe to be tested is clamped between the moving component and the fixed component. The moving component drives the steel pipe to be tested to move towards the testing part of the fixed component through the drive mechanism, thereby realizing step-by-step all-round testing.

[0008] Furthermore, the drive mechanism includes a horizontally arranged dual-axis motor, a pair of worm gears, a pair of limit seats, and a vertically arranged pair of turbines, a pair of threaded rods, and a pair of limit plates. The worm gears are respectively shaft-connected to both sides of the dual-axis motor. The worm gears rotate within the pair of limit seats arranged on the horizontal side of the worktable. The worm gears are drive-connected to the turbines, and the turbines are drive-connected to the threaded rods. The threaded rods rotate within the pair of limit seats arranged on the vertical side of the worktable. The threaded rods are drive-connected to the moving component.

[0009] Furthermore, the moving component includes a moving plate, a support plate, a pair of connecting plates, and a pair of clamping rings. The moving plate is axially connected to the pair of threaded rods. The support plate is located at the upper center of the moving plate. A pair of connecting plates is provided on the front side of the support plate. A pair of clamping rings are provided inside the pair of connecting plates. The pair of clamping rings can clamp the steel pipe to be tested.

[0010] Furthermore, the moving component also includes a pair of long plates, a reinforcing plate, and a locking mechanism. The pair of long plates are disposed on the upper side of the support plate, the reinforcing plate is disposed on the upper side of the pair of long plates, and is used to reinforce the position of the steel pipe to be tested. The locking mechanism is used to fasten the position of the reinforcing plate.

[0011] Furthermore, the locking mechanism is provided in four sets, with each pair of sets located on both sides of the end of the reinforcing plate. Each set of the locking mechanism includes a hinge plate, a locking plate, and a locking block. One end of the hinge plate is vertically fixed to the upper side of the long plate, and the locking plate is hinged to the other end of the hinge plate. A locking block is provided on the lower side of the end of the locking plate, and the locking block is engaged in a slot provided on the upper side of the reinforcing plate.

[0012] Furthermore, the fixing component includes a pair of support seats, a pair of mounting plates, a fixing ring, and a detection part. The pair of support seats are set on the workbench, and two sets of pair of mounting plates, one upper and one lower, are provided between the pair of support seats. A fixing ring is provided between the upper pair of mounting plates and the lower pair of mounting plates. The steel pipe to be tested can be clamped and detected in the fixing ring. The detection part is located on the periphery of the fixing ring and can extend and retract within the fixing ring.

[0013] Furthermore, the detection unit is provided in four groups arranged in a cross shape around the fixed ring. Each group of the detection unit includes a push rod extending into the fixed ring, a contact round head, a fixed seat, a scale plate, and a sliding mechanism located outside the fixed ring. The fixed seat is used to connect and fix the parallel scale plate and the sliding mechanism. The front end of the push rod is provided with a contact round head, and the rear end of the push rod is connected to the sliding mechanism and can extend and retract synchronously with the sliding mechanism.

[0014] Furthermore, the sliding mechanism includes a pair of sliding rods, a sliding plate, a long rod, and a spring. The pair of sliding rods are located between the fixed seat and the outer wall of the fixed ring. The sliding plate abuts against the rear end of the push rod and slides on the pair of sliding rods. The long rod is located between the sliding plate and the fixed seat and is situated in the middle of the pair of sliding rods. The long rod is wound around the spring and can pass through the fixed seat.

[0015] Furthermore, the scale plate is provided with indicator graduations.

[0016] Compared with the prior art, this utility model has the following advantages: This utility model discloses a steel pipe straightness testing device with a compact structure, convenient operation, and improved measurement accuracy. Specifically, through the clamping and testing mechanism, when the clamping ring clamps and fixes the steel pipe to be tested, the locking plate is moved to drive the locking block to engage in the locking groove, thereby limiting and fixing the position of the long plate, making the clamping ring clamp the steel pipe to be tested more firmly; when the contact round head contacts the steel pipe to be tested, if there is a protrusion or bend on the surface of the steel pipe, the contact round head can drive the push rod to move, and the push rod drives the slide plate to slide on the surface of the slide rod, thereby displaying the corresponding indication scale on the scale plate, which is convenient for human observation and can also be manually marked on the surface of the steel pipe to be tested; through the drive mechanism, the dual-axis motor drives the worm gears on both sides to rotate, the worm gears drive the worm wheel to rotate, the worm wheel drives the threaded rod to rotate, at this time the moving plate moves under the drive of the threaded rod, thereby gradually pushing the clamped steel pipe to be tested towards the testing part of the fixed component, and detecting whether the surface of the steel pipe to be tested is straight by matching the contact surface of the contact round head. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the mobile component of this utility model.

[0019] Figure 3 yes Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0020] Figure 4 This is a schematic diagram of the fixing component structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the detection section in the fixed component of this utility model.

[0022] Figure 6 This is a schematic diagram of the drive mechanism structure of this utility model.

[0023] Reference numerals: 1. Moving plate; 2. Worktable; 3. Drive mechanism; 31. Limiting plate; 32. Threaded rod; 33. Sliding rod; 34. Limiting seat; 35. Dual-axis motor; 36. Worm gear; 37. Worm; 4. Clamping and detection mechanism; 41. Moving component; 411. Support plate; 412. Connecting plate; 413. Clamping ring; 414. Hinge plate; 415. Locking plate; 416. Locking block; 417. Locking groove; 418. Long plate; 419. Reinforcing plate; 42. Fixing component; 421. Long rod; 422. Fixing seat; 423. Sliding rod; 424. Indicating scale; 425. Slide plate; 426. Push rod; 427. Contact round head; 428. Fixing ring; 429. Mounting plate; 4201. Scale plate; 4202. Spring; 4203. Support seat; 5. Steel pipe to be tested. Detailed Implementation

[0024] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0025] like Figure 1 As shown, a steel pipe straightness testing device includes a workbench 2 and a drive mechanism 3 and a clamping testing mechanism 4 on the workbench 2. The clamping testing mechanism 4 includes a moving component 41 and a fixed component 42 disposed on the workbench 2. The steel pipe 5 to be tested is clamped between the moving component 41 and the fixed component 42. The moving component 41 drives the steel pipe 5 to be tested to move towards the testing part of the fixed component 42 through the drive mechanism 3, thereby realizing step-by-step all-round testing.

[0026] like Figure 2 , 6 As shown, the drive mechanism 3 includes a horizontally arranged dual-axis motor 35, a pair of worm gears 37, a pair of limiting seats 34, and a vertically arranged pair of turbines 36, a pair of threaded rods 32, and a pair of limiting plates 31. The dual-axis motor 35 has worm gears 37 shafted to both sides. The worm gears 37 rotate within the pair of limiting seats 34 arranged on the horizontal side of the worktable 2. The worm gears 37 are drive-connected to the turbines 36, and the turbines 36 are drive-connected to the threaded rods 32. The threaded rods 32 rotate within the pair of limiting plates 31 arranged on the vertical side of the worktable 2. The threaded rods 32 are drive-connected to the moving component 41. Figure 3As shown, the moving assembly 41 includes a moving plate 1, a support plate 411, a pair of connecting plates 412, and a pair of clamping rings 413. The moving plate 1 is axially connected to the pair of threaded rods 32. The support plate 411 is located at the upper center of the moving plate 1. The pair of connecting plates 412 are located on the front side of the support plate 411. The pair of clamping rings 413 are located inside the pair of connecting plates 412, and the pair of clamping rings 413 can clamp the steel pipe 5 to be tested. The moving assembly 41 also includes a pair of long plates 418, a reinforcing plate 419, and a locking mechanism. The pair of long plates 418 are respectively located on the upper side of the support plate 411. The reinforcing plate 419 is located on the upper side of the pair of long plates 418 and is used to reinforce the position of the steel pipe 5 to be tested. The locking mechanism is used to fasten the position of the reinforcing plate 419. The locking mechanism is provided in four sets, with each pair of sets located on both sides of the end of the reinforcing plate 419. Each set of the locking mechanism includes a hinge plate 414, a locking plate 415, and a locking block 416. One end of the hinge plate 414 is vertically fixed to the upper side of the long plate 418, and the locking plate 415 is hinged to the other end of the hinge plate 414. A locking block 416 is provided on the lower side of the end of the locking plate 415, and the locking block 416 is engaged in the slot 417 provided on the upper side of the reinforcing plate 419.

[0027] like Figure 4 As shown, the fixing component 42 includes a pair of support seats 4203, a pair of mounting plates 429, a fixing ring 428, and a detection part. The pair of support seats 4203 are disposed on the workbench 2. Two sets of paired mounting plates 429 are provided between the pair of support seats 4203, one upper and one lower. A fixing ring 428 is provided between the upper and lower paired mounting plates 429, with the fixing ring 428 located at the center. The fixing ring 428 can clamp and detect the steel pipe 5 to be tested. The detection part is located around the fixing ring 428 and can extend and retract within the fixing ring 428. Figure 5 As shown, the detection unit is provided in four groups and arranged in a cross shape around the fixed ring 428. Each group of the detection unit includes a push rod 426 extending into the fixed ring 428, a contact round head 427, a fixed seat 422 located outside the fixed ring 428, a scale plate 4201, and a sliding mechanism. The fixed seat 422 is used to connect and fix the parallel scale plate 4201 and the sliding mechanism. The front end of the push rod 426 is provided with a contact round head 427, and the rear end of the push rod 426 is connected to the sliding mechanism and can extend and retract synchronously with the sliding mechanism. The sliding mechanism includes a pair of sliding rods 423, a sliding plate 425, a long rod 421, and a spring 4202. The pair of sliding rods 423 are located between the fixed base 422 and the outer wall of the fixed ring 428. The sliding plate 425 abuts against the rear end of the push rod 426 and slides on the pair of sliding rods 425. The long rod 421 is located between the sliding plate 425 and the fixed base 422 and is situated in the middle of the pair of sliding rods 423. The long rod 421 is wound around the spring 4202 and can extend out of the fixed base 422. The scale plate 4201 is provided with indicating graduations.

[0028] The working principle of this utility model is as follows: In actual operation, when it is necessary to test the straightness of the steel pipe 5 to be tested, the steel pipe 5 to be tested is first inserted into the pair of clamping rings 413 on the support plate 411. The clamping rings 413 are driven by the connecting plate 412 to clamp and fix the steel pipe 5 to be tested. The locking plate 415 is moved to fold the locking plate 415 and the hinge plate 414, so that the locking plate 415 drives the card block 416 to engage in the card slot 417, which can limit and fix the position of the long plate 418, so that the pair of clamping rings 413 can further reinforce the steel pipe 5 to be tested. When the dual-axis motor 35 is started, it drives the worm gears 37 on both sides to rotate. The pair of worm gears 37 drive the pair of worm wheels 36 to rotate. The pair of worm wheels 36 drive the pair of threaded rods 32 to rotate, thereby driving the moving plate 1 to move on the surface of the threaded rod 32. When the moving plate 1 moves, it can move the clamped steel pipe 5 to be tested towards the detection part of the fixed component 42, so as to facilitate the subsequent detection of the contact surface between the steel pipe 5 and the contact head 427 to detect whether the steel pipe 5 is straight. When the contact head 427 contacts the steel pipe 5, if there is a protrusion or bend on the surface of the steel pipe 5, the contact head 427 will immediately drive the push rod 426 to move. The push rod 426 will then drive the slide plate 425 to slide on the surface of the slide rod 423. At this time, the displacement index can be observed by human eyes and read through the indicator scale on the scale plate 4201. Then, the surface of the steel pipe 5 can be marked with human assistance. Under the rebound of the spring 4202, the contact head 427 can be reset, so that the contact head 427 can perform straightness detection again at different positions on the surface of the steel pipe 5 later.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the concept of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A steel pipe straightness testing device, characterized in that: The device includes a workbench and a drive mechanism and a clamping and detection mechanism on the workbench. The clamping and detection mechanism includes a moving component and a fixed component on the workbench. The steel pipe to be tested is clamped between the moving component and the fixed component. The moving component drives the steel pipe to be tested towards the detection part of the fixed component through the drive mechanism, thereby realizing step-by-step all-round detection. The drive mechanism includes a horizontally arranged dual-axis motor, a pair of worm gears, a pair of limit seats, and a vertically arranged pair of turbines, a pair of threaded rods, and a pair of limit plates. The dual-axis motor is connected to the worm gears on both sides. The worm gears rotate within the pair of limit seats arranged on the horizontal side of the worktable. The worm gears are connected to the turbines via a transmission, and the turbines are connected to the threaded rods via a transmission. The threaded rods rotate within the pair of limit seats arranged on the vertical side of the worktable. The threaded rods are connected to the moving component via a transmission. The moving component includes a moving plate, a support plate, a pair of connecting plates, and a pair of clamping rings. The moving plate is axially connected to a pair of threaded rods. The support plate is located at the upper center of the moving plate. A pair of connecting plates is provided on the front side of the support plate. A pair of clamping rings are provided inside the pair of connecting plates. The pair of clamping rings can clamp the steel pipe to be tested. The moving component also includes a pair of long plates, a reinforcing plate, and a locking mechanism. The pair of long plates are located on the upper side of the support plate, and the reinforcing plate is located on the upper side of the pair of long plates to reinforce the position of the steel pipe to be tested. The locking mechanism is used to fasten the position of the reinforcing plate. The locking mechanism is provided in four sets, with each pair of sets located on both sides of the end of the reinforcing plate. Each set of the locking mechanism includes a hinge plate, a locking plate, and a locking block. One end of the hinge plate is vertically fixed to the upper side of the long plate, and the locking plate is hinged to the other end of the hinge plate. A locking block is provided on the lower side of the end of the locking plate, and the locking block is locked into the slot provided on the upper side of the reinforcing plate. The fixing assembly includes a pair of support seats, a pair of mounting plates, a fixing ring, and a detection part. The pair of support seats are set on the workbench. There are two sets of pair of mounting plates, upper and lower, between the pair of support seats. A fixing ring is set between the upper pair of mounting plates and the lower pair of mounting plates. The steel pipe to be tested can be clamped and detected in the fixing ring. The detection part is set on the periphery of the fixing ring and can extend and retract in the fixing ring. The detection unit is provided in four groups and arranged in a cross shape around the fixed ring. Each group of the detection unit includes a push rod that extends into the fixed ring, a contact round head, a fixed seat, a scale plate, and a sliding mechanism located outside the fixed ring. The fixed seat is used to connect and fix the parallel scale plate and the sliding mechanism. The front end of the push rod is provided with a contact round head, and the rear end of the push rod is connected to the sliding mechanism and can extend and retract synchronously with the sliding mechanism.

2. The steel pipe straightness testing device according to claim 1, characterized in that: The sliding mechanism includes a pair of sliding rods, a sliding plate, a long rod, and a spring. The pair of sliding rods are located between the fixed seat and the outer wall of the fixed ring. The sliding plate abuts against the rear end of the push rod and slides on the pair of sliding rods. The long rod is located between the sliding plate and the fixed seat and in the middle of the pair of sliding rods. The long rod is wound around the spring and can pass through the fixed seat.

3. The steel pipe straightness testing device according to claim 1, characterized in that: The scale plate has indicator graduations.

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