CN211121076U - End wall thickness measuring system based on steel pipe spiral advancing - Google Patents

Abstract

The utility model provides an end wall thickness measurement system based on the spiral travel of a steel pipe, which comprises a laser displacement combined measuring head, a steel pipe spiral travel drive device, and a steel pipe travel follower device; the steel pipe spiral travel drive device is used to carry and drive the steel pipe spiral travel The steel pipe spirals; the laser displacement combined probe is installed on the steel pipe travel follower device, including a single-point laser displacement sensor and a 2D line laser displacement sensor; the single-point laser displacement sensor and the 2D line laser displacement sensor are installed on the same straight line. , which is arranged at one end of the steel pipe to be measured; the single-point laser displacement sensor is located at the upper left of the 2D line laser displacement sensor, and the same straight line forms an inclined angle α with the vertical direction; the steel pipe travel following device is used to drive the laser displacement combination measurement during measurement The head follows the steel pipe to be tested. The utility model has high detection speed and high precision, can be applied to the detection of the end wall thickness of high-temperature steel pipes, and has strong environmental adaptability.

Description

End wall thickness measurement system based on steel pipe spiral travel

technical field

The utility model relates to the field of steel pipe end wall thickness detection, in particular to a method for measuring the wall thickness of a steel pipe end by using a combined probe matched with a single point and a line laser displacement sensor under the condition that a steel pipe spirally travels, and a corresponding measurement method system.

Background technique

Due to the particularity of its manufacturing process (hot rolling), the seamless steel pipe is prone to uneven wall thickness in the circumferential direction of the steel pipe. The national standard stipulates that the steel pipe must pass 100% quality inspection before leaving the factory; due to the current seamless steel pipe. Since the price is measured by length instead of weight, the precise control of the wall thickness of the steel pipe and the production within the lower deviation range can also improve the economic benefits of the steel pipe manufacturer to a certain extent; in addition, through the evaluation of the steel pipe wall thickness can also be achieved. Monitoring of the working conditions of the rolling mill, for example, when the rolling mill is eccentric, the wall thickness of the processed steel pipe will be uneven. In summary, the wall thickness detection of steel pipe ends has very important social benefits and economic value.

The traditional steel pipe wall thickness measurement method mainly relies on manual inspection with tools such as calipers. This type of mechanical manual measurement has many disadvantages, such as high labor intensity, large manual errors, low detection efficiency, and difficulty in measuring internal dimensions. At present, the commonly used methods for automatic thickness measurement of steel pipes include electromagnetic method, ultrasonic method and ray method. The electromagnetic method mainly relies on the principle of changing the magnetic flux caused by the change of the wall thickness of the workpiece to complete the measurement of the steel pipe wall thickness. This method based on relative measurement needs to first give a reference reference thickness value, and then compare the measured value with the reference value. The estimated thickness is obtained, so the measurement error is large, and generally only a wall thickness of <12mm can be detected. In comparison, the ultrasonic-based pulse reflection method can directly measure the wall thickness value, which is usually realized by a single straight probe and two oblique probes. Therefore, the ultrasonic method is currently the most widely used wall thickness measurement method, but the conventional ultrasonic method requires a couplant, and is a contact measurement, with a slow detection speed, so it is not suitable for high temperature and high-speed detection, and the results of ultrasonic thickness measurement are affected by The roughness of the surface of the workpiece has a great influence; and for small diameter steel pipes, due to the excessive curvature, the accuracy of ultrasonic thickness measurement is not high. The cost of the wall thickness measurement method based on the ray method is too high, and the requirements for the environment are too high. Therefore, it is of great significance to develop a steel pipe wall thickness measurement system with fast detection speed, high detection accuracy and strong environmental adaptability.

SUMMARY OF THE INVENTION

The purpose of the utility model is to overcome the deficiencies in the prior art, and to provide an end wall thickness measurement device based on the spiral travel of a steel pipe, and a corresponding measurement method; based on the non-contact measurement principle, the existing wall thickness detection method is solved. The problems of low detection accuracy, low efficiency and high cost of outsourcing equipment. The technical scheme adopted by the utility model is:

The embodiment of the present utility model provides an end wall thickness measurement system based on the spiral travel of a steel pipe, which includes a laser displacement combined probe, a steel pipe spiral travel drive device, and a steel pipe travel follower device;

The steel pipe helical travel driving device is used for carrying and driving the steel pipe to be tested for helical travel;

The laser displacement combined probe is installed on the steel pipe travel follower device, including a single-point laser displacement sensor and a 2D line laser displacement sensor;

The single-point laser displacement sensor and the 2D line laser displacement sensor are installed on the same straight line, and are arranged at one end of the steel pipe to be tested; the single-point laser displacement sensor is located at the upper left of the 2D line laser displacement sensor, and the same line is inclined to the vertical direction. α;

The steel pipe traveling following device is used to drive the laser displacement combined probe to follow the steel pipe to be measured during measurement.

Further, the steel pipe traveling following device includes an upper wedge block, a lower wedge block, an upper fixing plate, a lower fixing plate, and a linear sliding table;

The linear sliding table is installed on the frame; the lower fixing plate is installed on the linear sliding table, and the upper fixing plate is fixed on the side of the lower fixing plate away from the steel pipe spiral traveling drive device; the single-point laser displacement sensor is installed on the upper fixed plate through the upper wedge block. On the board, the 2D line laser displacement sensor is installed on the lower fixed plate through the lower wedge block, and the straight line where the two laser displacement sensors are installed at the center forms an inclined angle α with the vertical direction.

More preferably, a workpiece hole is opened on the upper fixing plate for the steel pipe to be tested to move forward after the detection is completed.

Further, a photoelectric sensor is also provided on the frame or the linear sliding table.

Further, the steel pipe helical travel driving device adopts a pair of roller drive device, and the pair of rollers in the pair of roller drive device and the steel pipe to be tested have a deflection angle in the axial direction.

The embodiment of the present utility model also proposes a method for measuring the wall thickness of the end head based on the spiral travel of the steel pipe, including:

When the steel pipe to be tested spirally travels to the detection area at the set speed, the photoelectric sensor is triggered, and the PLC controls the laser displacement combined probe to start to measure the wall thickness of the end of the steel pipe to be tested; at the same time, the steel pipe travel follower device drives the laser displacement combined probe to make at least one pitch the following movement;

The distance from the single-point laser displacement sensor to the inner wall of the steel pipe to be measured is t ₁ ;

The Z-axis distance data of the central pixel of the 2D line laser displacement sensor is t ₂ , and the minimum data of the Z-axis distance of the 2D line laser displacement sensor is t ₃ ; The orientation of the laser displacement sensor;

The distance between the single-point laser displacement sensor and the 2D line laser displacement sensor is T;

When the steel pipe to be tested is stationary, its theoretical wall thickness d is calculated by formula (2);

d=(Tt ₁ -t ₂ )cosα (2)

The Z-axis data offset h of the center pixel of the 2D line laser displacement sensor; the horizontal offset X of the swing;

h=(t ₂ -t ₃ )cosα (3)

R ₁ =X ₁ +h (4)

(R ₁ ) ² =X ² +(X ₁ ) ² (5)

X ₂ =X ₁ -d (6)

(R ₂ ) ² =(X ₂ ) ² +X ² (7)

X ₁ and X ₂ are intermediate parameters; the outer radius R ₁ and X ₁ of the steel pipe to be tested are calculated by the combined formulas (4) and (5); the inner circle of the steel pipe to be tested is calculated by the combined formulas (6) and (7) Radius R ₂ and X ₂ ;

t=R ₁ -R ₂ (8)

Finally, the actual wall thickness t of the steel pipe to be tested is calculated by formula (8).

The advantages of the present utility model are:

1) The non-contact measurement mechanism and measurement method can be applied to the end wall thickness detection of high temperature steel pipes, and have strong environmental adaptability.

2) The detection speed is fast, the accuracy is high, and the dynamic thickness measurement accuracy reaches ±0.1mm.

3) Compared with the traditional wall thickness measurement method, no couplant is required, and the device is simple and portable.

4) It can measure a variety of different diameters and lengths of steel pipes, with great flexibility.

Description of drawings

FIG. 1 is a schematic diagram of the structure and composition of a measurement system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a static measurement principle according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a dynamic measurement principle according to an embodiment of the present invention.

Detailed ways

The utility model will be further described below in conjunction with the specific drawings and embodiments.

The embodiment of the present utility model provides an end wall thickness measurement system based on the spiral travel of a steel pipe, which includes a laser displacement combined probe, a steel pipe spiral travel drive device, and a steel pipe travel follower device;

The steel pipe helical travel driving device is used to carry and drive the steel pipe 8 to be tested for helical travel;

The laser displacement combined probe is installed on the steel pipe travel follower device, including a single-point laser displacement sensor 1 and a 2D line laser displacement sensor 2;

The single-point laser displacement sensor 1 and the 2D line laser displacement sensor 2 are installed concentrically on the same line, and are arranged at one end of the steel pipe 8 to be tested; the single-point laser displacement sensor 1 is located at the upper left of the 2D line laser displacement sensor 2, and the same line is The vertical direction forms an inclination angle α; the smaller the inclination angle is, the higher the measurement accuracy will be, but if the angle is too small, the laser line will not be able to fall on the inner wall of the steel pipe wall thickness measurement part. The specific installation angle α should take into account the smallest diameter. The outer diameter D of the steel pipe to be measured and its end axial measurement range L;

The laser line emitted by the single-point laser displacement sensor 1 is a laser point when it hits the inner wall of the steel pipe to be measured;

The laser line emitted by the 2D line laser displacement sensor 2 is an arc when it hits the outer wall of the steel pipe to be tested;

The measurement system in the embodiment of the present invention is suitable for steel pipes with steel pipe specifications ranging from 60 to 180 mm in diameter, so the range selected by the single-point laser displacement sensor 1 is 200 mm, and the range selected by the 2D line laser displacement sensor 2 is 20 mm;

The steel pipe traveling following device is used to drive the laser displacement combined probe to follow the steel pipe to be measured during measurement;

In some embodiments, the steel pipe helical travel driving device may adopt a pair of roller drive device 9, and the pair of rollers in the pair of roller drive device 9 and the steel pipe 8 to be tested have a certain deflection angle in the axial direction, so that the steel pipe to be tested can be driven. 8 Go forward in a spiral manner;

In some embodiments, the steel pipe traveling following device includes an upper wedge block 3, a lower wedge block 4, an upper fixing plate 5, a lower fixing plate 6, and a linear sliding table 7;

The linear sliding table 7 is installed on the frame 10; the lower fixing plate 6 is installed on the linear sliding table 7, and the upper fixing plate 5 is fixed on the side of the lower fixing plate 6 away from the steel pipe spiral traveling driving device; the single-point laser displacement sensor 1 passes through The upper wedge-shaped block 3 is installed on the upper fixed plate 5, the 2D line laser displacement sensor 2 is installed on the lower fixed plate 6 through the lower wedge-shaped block 4, and the line where the two laser displacement sensors are installed at the center forms an inclination angle α with the vertical direction;

A photoelectric sensor can also be provided on the frame 10 or the linear slide 7 to detect whether the steel pipe 8 to be tested travels to the detection position;

More preferably, the upper fixing plate 5 is provided with a workpiece hole 501, which can be used for the steel pipe 8 to be tested to move forward after the detection is completed, pass through the workpiece hole 501, and then be transported by other conveying mechanisms;

The embodiment of the present utility model also proposes a method for measuring the wall thickness of the end head based on the spiral travel of the steel pipe, including:

When the steel pipe 8 to be tested spirals to the detection area at a set speed (for example, 2.5m/s), the photoelectric sensor is triggered, and the PLC controls the laser displacement combined probe to measure the wall thickness of the end of the steel pipe to be tested 8; at the same time, the steel pipe travel following device drives The laser displacement combined probe does at least one pitch following movement;

The distance from the single-point laser displacement sensor 1 to the inner wall of the steel pipe 8 to be measured is t ₁ ;

The Z-axis distance data of the center pixel of the 2D line laser displacement sensor 2 is t ₂ , and the minimum Z-axis distance data of the 2D line laser displacement sensor 2 is t ₃ (caused by steel pipe jumping); the Z-axis direction of the 2D line laser displacement sensor 2 is The 2D line laser displacement sensor 2 faces the direction of the single-point laser displacement sensor 1;

The distance between the single-point laser displacement sensor 1 and the 2D line laser displacement sensor 2 is T;

When the steel pipe to be tested is stationary, its theoretical wall thickness d can be calculated by formula (2);

d=(Tt ₁ -t ₂ )cosα (2)

Since the steel pipe 8 to be tested will jump up and down and swing left and right during the spiral travel, the theoretical wall thickness d calculated directly by formula (2) will be larger than the actual wall thickness value;

The Z-axis data offset h of the center pixel point of the 2D line laser displacement sensor 2; the horizontal offset X of the swing; as shown in Figure 3,

h=(t ₂ -t ₃ )cosα (3)

R ₁ =X ₁ +h (4)

(R ₁ ) ² =X ² +(X ₁ ) ² (5)

X ₂ =X ₁ -d (6)

(R ₂ ) ² =(X ₂ ) ² +X ² (7)

X ₁ and X ₂ are intermediate parameters; the combined formulas (4) and (5) can calculate the outer radius R ₁ and X ₁ of the steel pipe to be tested; the combined formulas (6) and (7) can be calculated to obtain the Inner circle radius R ₂ and X ₂ ;

t=R ₁ -R ₂ (8)

Finally, the actual wall thickness t of the steel pipe to be tested is calculated by formula (8).

Since the steel pipe to be tested travels in a spiral, with the rotation of the steel pipe to be tested, the full circumference coverage detection of the end of the steel pipe can be realized, and this method effectively overcomes the high-speed movement of the steel pipe to be tested due to the up-and-down and left-right swing of the steel pipe. resulting in measurement errors.

After the measurement is completed, the steel pipe 8 to be tested passes through the workpiece hole 501 of the upper fixing plate 5, and is then transferred away by other conveying mechanisms.

Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to examples, those of ordinary skill in the art should The technical solutions can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be included in the scope of the claims of the present invention.

Claims (5)

1. an end wall thickness measurement system based on steel pipe spiral travel, is characterized in that, comprises laser displacement combined probe, steel pipe spiral travel drive device, steel pipe travel follower device; The steel pipe helical travel driving device is used to carry and drive the steel pipe (8) to be tested for helical travel; The laser displacement combined measuring head is installed on the steel pipe traveling following device, and includes a single-point laser displacement sensor (1) and a 2D line laser displacement sensor (2); The single-point laser displacement sensor (1) and the 2D line laser displacement sensor (2) are installed concentrically on the same straight line, and are arranged at one end of the steel pipe (8) to be measured; the single-point laser displacement sensor (1) is located on the 2D line laser displacement sensor ( 2) In the upper left, the same straight line forms an inclined angle α with the vertical direction; The steel pipe traveling following device is used to drive the laser displacement combined probe to follow the steel pipe to be measured during measurement. 2. The end wall thickness measurement system based on the spiral running of the steel pipe according to claim 1, characterized in that, The steel pipe traveling following device includes an upper wedge block (3), a lower wedge block (4), an upper fixing plate (5), a lower fixing plate (6), and a linear sliding table (7); The linear sliding table (7) is installed on the frame (10); the lower fixing plate (6) is installed on the linear sliding table (7), and the upper fixing plate (5) is fixed on the lower fixing plate (6) and spirals away from the steel pipe One side of the driving device; the single-point laser displacement sensor (1) is installed on the upper fixed plate (5) through the upper wedge block (3), and the 2D line laser displacement sensor (2) is installed on the lower fixed plate ( 6), the line where the two laser displacement sensors are installed at the center forms an inclined angle α with the vertical direction. 3. The end wall thickness measurement system based on the spiral running of the steel pipe according to claim 2, characterized in that, The upper fixing plate (5) is provided with a workpiece hole (501) for the steel pipe (8) to be tested to move forward after the detection is completed. 4. The end wall thickness measurement system based on the spiral running of the steel pipe according to claim 2, characterized in that, A photoelectric sensor is also provided on the frame (10) or the linear slide table (7). 5 . The end wall thickness measurement system based on the spiral running of the steel pipe according to any one of claims 1 to 4 , wherein, The steel pipe helical travel driving device adopts a pair of roller drive device (9), and the pair of rollers in the pair of roller drive device (9) and the steel pipe (8) to be tested have an axial deflection angle.

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