Spiral steel pipe blank size real-time detection device and pipe blank size detection method

Abstract

The invention belongs to the field of spiral submerged arc welding pipe manufacturing, particularly relates to a spiral steel pipe blank size real-time detection device and a pipe blank size detection method, and aims to solve the problems of large workload, high adjustment difficulty and inaccurate measurement result caused by frequent disassembly and assembly in the lane changing and shape adjusting process. The device comprises a fixed base, a support, a stand column, a linear sliding table, an annular frame device and a laser distance measuring sensor. By adjusting the angles and the positions of the stand column and the linear sliding table, the circle center of the annular frame device coincides with the circle center of a pipe blank, and then the size of the pipe blank is measured through the laser distance measuring sensor. According to the invention, data measurement is timely, accurate and reliable, and defects of manual measurement can be effectively eliminated; compared with a traditional measuring device, the problems that the workload is large, the adjusting difficulty is high and the measuring result is inaccurate due to the fact that frequent disassembly and assembly are needed in the lane changing and shape adjusting process are solved.

Description

Technical Field

[0001] The invention belongs to the field of spiral submerged arc welded pipe manufacturing, and specifically relates to a real-time detection device for the size of a spiral steel pipe blank and a method for detecting the size of the blank. Background Art

[0002] In the production process of spiral welded pipes, it is very important to control the pipe diameter. Only by real-time measurement and control of the diameter and ovality of the produced pipe blanks can qualified steel pipes be produced. At present, most pipe manufacturers still use a steel tape measure wrapped around the outer wall of the pipe blank to measure the circumference of the steel pipe to check the diameter of the steel pipe. Since the pipe diameter is measured manually with a steel tape measure, it is easy to produce measurement errors due to the influence of the operator's quality; for the continuous production of spiral welded pipes with a diameter of more than Φ820mm, it is extremely inconvenient to use a steel tape measure for manual measurement. Therefore, manual measurement has problems such as slow measurement speed and large measurement data errors. In recent years, with the continuous improvement of the industry's automation level, a real-time detection device for the size of spiral steel pipe blanks has come into being.

[0003] However, the traditional online measuring device for spiral steel pipe diameter only has the function of lifting and lowering adjustment, and the ring frame for installing the laser sensor is usually an integrated structure. The entire measuring device needs to be accurately installed to ensure the coaxiality between the center of the measuring ring frame and the center line of the steel pipe blank. The installation error is large, resulting in uneven measurement results; and when the steel pipe changes due to changes in pipe diameter specifications and the forming process needs to be changed and adjusted, in order to facilitate the operation of personnel, the online measuring device for pipe diameter needs to be dismantled as a whole, and the pipe profile quality is stabilized before installation and debugging; however, the quality of the spiral steel pipe blank can only be stabilized after the head end of the blank enters the subsequent straightener equipment. At this time, to install the measuring device, the head end of the blank between the spiral steel pipe former and the straightener must be cut off, resulting in a huge workload for the installation of the measuring device.

[0004] Based on this, the present invention provides a real-time detection device for spiral steel pipe billet size and a method for detecting the billet size. Summary of the invention

[0005] In order to solve the above-mentioned problems in the prior art, that is, in the prior art, the process of changing lanes and adjusting shapes requires frequent disassembly and installation, which causes a large workload, high adjustment difficulty and inaccurate measurement results, the present invention provides a real-time detection device and method for the size of a spiral steel pipe blank.

[0006] In one aspect of the present invention, a device for real-time detection of the size of a spiral steel pipe blank is provided, the device comprising:

[0007] Fixed base, support, column, linear slide, ring frame device, laser distance sensor;

[0008] The lower surface of the fixed base is fixed to the turntable of the spiral steel pipe former, and the upper surface of the fixed base is detachably fixedly connected to the support; the column is rotatably connected to the support; the linear slide is drivingly connected to the column; the annular frame device is connected to the linear slide; the laser ranging sensor is connected to the annular frame device, and the laser ranging sensor is used to measure the size of the spiral steel pipe blank.

[0009] In some preferred embodiments, the support is rotatably connected to the column via a slewing bearing, the support is fixed to the fixed bottom surface of the slewing bearing, the movable top surface of the slewing bearing is bolted to the bottom surface of the column, the slewing bearing is drivably connected to the first drive assembly, and the first drive assembly is fixed to the fixed bottom surface of the slewing bearing.

[0010] In some preferred embodiments, the linear slide comprises a movable end and a fixed end;

[0011] The fixed end of the linear slide is fixed to the column by bolts, the movable end of the linear slide is connected to the annular frame device, the movable end of the linear slide is drivingly connected to the second driving component, and the second driving component is fixed to the column.

[0012] In some preferred embodiments, the moving end of the linear slide is connected to the annular frame device through a measuring mechanism, and the measuring device includes a steel ruler, a ruler pointer, a connecting seat, a connecting block, and an adjusting rod;

[0013] The steel ruler is fixed to the column, the ruler pointer and the connecting seat are fixed to the movable end of the linear slide, the ruler pointer points to the steel ruler, the connecting seat is fixed to the annular frame device, a plurality of connecting blocks are evenly fixed on the annular frame device, the adjusting rod is fixed on the connecting block, and the adjusting rod is fixed to the laser ranging sensor.

[0014] In some preferred embodiments, the connecting seat is fixed to the annular frame device via a first positioning pin.

[0015] In some preferred embodiments, the annular frame device includes a first semicircular frame, a second semicircular frame, a first connecting support, a second connecting support, a second positioning pin shaft, a first positioning pin, and a spring lock buckle;

[0016] One end of the first semicircular frame away from the fixed base is fixed to the first connecting support, and one end of the second semicircular frame away from the fixed base is fixed to the second connecting support, and the first connecting support and the second connecting support are fixed by a second positioning pin shaft;

[0017] One end of the first semicircular frame and the second semicircular frame close to the fixed base is fixed by the first positioning pin and the spring lock buckle.

[0018] In some preferred embodiments, one end of the first semicircular frame away from the fixed base is fixed to the first connecting support via a third positioning pin.

[0019] In some preferred embodiments, one end of the second semicircular frame away from the fixed base is fixed to the second connecting support via a fourth positioning pin.

[0020] In some preferred embodiments, the laser measurement sensor is fixed to the adjustment rod by bolts, and the connection block is fixed to the adjustment rod by bolts.

[0021] Another aspect of the present invention provides a method for detecting the size of a spiral steel pipe blank, based on a real-time detection device for the size of a spiral steel pipe blank, comprising the following steps:

[0022] Step S1, aligning the center of the annular frame device for fixing the laser ranging sensor with the center of the tube blank;

[0023] Step S2, initializing the diameter data of the tube blank as D', connecting the center points of the corresponding laser ranging sensors in the plurality of the first data groups to form a plurality of triangles;

[0024] Step S3: Acquire data measured by a plurality of laser ranging sensors as first data X n ;

[0025] Wherein, n is the number of the laser ranging sensors;

[0026] Step S4: compare the three first data X corresponding to each laser distance measuring sensor and the laser distance measuring sensor separated from it by one laser distance measuring sensor. n as a plurality of first data groups;

[0027] Step S5, using trigonometric function to calculate an angle α of the triangle according to the triangle and the corresponding first data group and D', and using trigonometric function to calculate a plurality of diameter data D and ovality data of the tube blank according to the first data group, α and D';

[0028] Step S6, taking the average of the plurality of diameter data D as final diameter data, taking the average of the plurality of ovality data as final ovality data, and outputting circumference data according to the final diameter data;

[0029] Step S7, inputting the circumference data and the final ovality data into a PLC controller to determine whether they meet the standards;

[0030] If it meets the requirements, no signal is sent;

[0031] If it does not meet the requirements, an alarm signal will be issued.

[0032] Beneficial effects of the present invention:

[0033] The present invention provides a real-time detection device for the size of a spiral steel pipe blank, which is an important detection device for producing high-standard spiral welded pipes. It can be used to achieve the purpose of real-time monitoring of dimensional parameters such as the diameter, circumference, and ovality of the spiral steel pipe blank. The measurement data is timely, accurate, and reliable, and the disadvantages of manual measurement can be effectively eliminated. Compared with traditional measuring devices, it solves the problems of large workload, high adjustment difficulty, and inaccurate measurement results caused by frequent disassembly and installation in the process of changing lanes and adjusting shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0035] Figure 1 This is a front view of a device for real-time detection of the size of a spiral steel pipe blank according to the present invention;

[0036] Figure 2 It is an axonometric measurement of a real-time detection device for the size of a spiral steel pipe blank of the present invention;

[0037] Figure 3 yes Figure 2 A partial enlarged view of the first position;

[0038] Figure 4 yes Figure 2 A partial enlarged view of the second position;

[0039] Figure 5 yes Figure 2 A partial enlarged view of the third position;

[0040] Figure 6 yes Figure 1 A partial enlarged view of

[0041] Figure 7 It is a first schematic diagram of a method for detecting the size of a spiral steel pipe blank of the present invention;

[0042] Figure 8 It is a second schematic diagram of a method for detecting the size of a spiral steel pipe blank of the present invention;

[0043] Fig. 9is a third schematic diagram of a method for detecting the size of a spiral steel pipe blank of the present invention;

[0044] Fig.10 is a fourth schematic diagram of a method for detecting the size of a spiral steel pipe blank of the present invention;

[0045] Fig.11 is a fifth schematic diagram of a method for detecting the size of a spiral steel pipe blank of the present invention;

[0046] Fig.12 is a sixth schematic diagram of a method for detecting the size of a spiral steel pipe blank of the present invention;

[0047] Fig.13 It is the seventh schematic diagram of a method for detecting the size of a spiral steel pipe blank of the present invention.

[0048] Fig.14 It is the eighth schematic diagram of a method for detecting the size of a spiral steel pipe blank of the present invention. DETAILED DESCRIPTION

[0049] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. The first embodiment of the present invention is as follows Figure 1-6 As shown, see Figure 1 , a real-time detection device for the size of a spiral steel pipe blank is provided, the device comprising: a fixed base 1, a support 2, a column 3, a linear slide 6, a ring frame device 9, and a laser distance sensor 12;

[0051] The lower surface of the fixed base 1 is fixed to the turntable of the spiral steel pipe former, and the upper surface of the fixed base 1 is detachably fixedly connected to the support 2; the column 3 is rotatably connected to the support 2; the linear slide 6 is drivingly connected to the column 3; the annular frame device 9 is connected to the linear slide 6; the laser ranging sensor 12 is connected to the annular frame device 9, and the laser ranging sensor 12 is used to measure the size of the spiral steel pipe blank.

[0052] Among them, the upper surface of the fixed base 1 is detachably fixedly connected to the support 2 in the following manner: the fixed base 1 is connected to the support 2 by bolts, and the relative positions of the fixed base 1 and the support 2 can be adjusted by bolts, thereby fine-tuning the position of the annular frame device 9, and finally making the center of the annular frame device 9 coincide with the center of the tube blank.

[0053] Preferably, see Figure 1 , Figure 2 The support 2 is rotatably connected to the column 3 through a slewing bearing 4, the support 2 is fixed to the fixed bottom surface of the slewing bearing 4, the movable top surface of the slewing bearing 4 is bolted to the bottom surface of the column 3, the slewing bearing 4 is drivingly connected to the first driving assembly 13, and the first driving assembly 13 is fixed to the fixed bottom surface of the slewing bearing 4.

[0054] Wherein, the first driving component 13 is a rotating motor.

[0055] Preferably, see Figure 2 , the linear slide 6 includes a moving end and a fixed end;

[0056] The fixed end of the linear slide 6 is fixed to the column 3 by bolts, the movable end of the linear slide 6 is connected to the annular frame device 9, the movable end of the linear slide 6 is drive-connected to the second drive component 24, and the second drive component 24 is fixed to the column 3.

[0057] Among them, the second driving component 24 is a rotating motor, the linear slide 6 is the existing technology, the linear slide 6 can be a nut-screw mechanism, the nut is the moving end of the linear slide 6, and the guide rail in the nut-screw mechanism is the fixed end of the linear slide 6.

[0058] Preferably, see Figure 1 , Figure 2 , Figure 4 The moving end of the linear slide 6 is connected to the annular frame device 9 through a measuring mechanism, and the measuring device includes a steel ruler 5, a ruler pointer 7, a connecting seat 8, a connecting block 10, and an adjusting rod 11;

[0059] The steel ruler 5 is fixed to the column 3, the ruler pointer 7 and the connecting seat 8 are fixed to the moving end of the linear slide 6, the ruler pointer 7 points to the steel ruler 5, the connecting seat 8 is fixed to the annular frame device 9, a plurality of connecting blocks 10 are evenly fixed on the annular frame device 9, the adjusting rod 11 is fixed on the connecting block 10, and the adjusting rod 11 is fixed to the laser ranging sensor 12.

[0060] There are a plurality of connection blocks 10 , adjustment rods 11 , and laser distance sensors 12 evenly distributed along the circumferential direction of the annular frame device 9 , preferably 8 in number.

[0061] Preferably, see Figure 2 , Figure 4 The connecting seat 8 is fixed to the annular frame device 9 through a first positioning pin shaft 23.

[0062] Preferably, see Figure 2 , Figure 3 , Figure 5 , Figure 6 The annular frame device 9 includes a first semicircular frame 14, a second semicircular frame 15, a first connecting support 16, a second connecting support 17, a second positioning pin shaft 20, a first positioning pin 21, and a spring lock buckle 22;

[0063] One end of the first semicircular frame 14 away from the fixed base 1 is fixed to the first connecting support 16, and one end of the second semicircular frame 15 away from the fixed base 1 is fixed to the second connecting support 17. The first connecting support 16 and the second connecting support 17 are fixed by a second positioning pin shaft 20;

[0064] The first semicircular frame 14 and the second semicircular frame 15 are fixed at one end close to the fixed base 1 by the first positioning pin 21 and the spring lock buckle 22 .

[0065] Among them, the upper part of the second connecting seat 17 is an open slot structure, and the width of the slot opening is the same as the diameter of the second positioning pin shaft 20, so that the second connecting seat 17 can be tightly hung on the first connecting seat 16 through the transition fit between the open slot and the second positioning pin shaft 20, thereby the second semicircular frame 15 can be hung on the first connecting seat 16 and rotate around the second positioning pin shaft 20 by being connected and fixed with the second connecting seat 17.

[0066] The ends of the first semicircular frame 14 and the second semicircular frame 15 close to the fixed base 1 are fixed to two positioning plates respectively, and the first positioning pin 21 passes through the two positioning plates to fix the first semicircular frame 14 and the second semicircular frame 15.

[0067] The structure of the spring lock buckle 22 is prior art, the spring lock buckle 22 is fixed to the first semicircular frame 14 , and the rotating end of the spring lock buckle 22 can be hung on a hook fixed to the second semicircular frame 15 .

[0068] Preferably, see Figure 3 The end of the first semicircular frame 14 away from the fixed base 1 is fixed to the first connecting support 16 through a third positioning pin 18.

[0069] Preferably, see Figure 3 The end of the second semicircular frame 15 away from the fixed base 1 is fixed to the second connecting support 17 through a fourth positioning pin 19.

[0070] The third positioning pin 18 and the fourth positioning pin 19 can be provided in plurality as required, and the first semicircular frame 14 and the first connecting support 16, and the second semicircular frame 15 and the second connecting support 17 can also be fixedly connected by bolts.

[0071] Preferably, see Figure 2 The laser measurement sensor 12 is fixed to the adjusting rod 11 by bolts, and the connecting block 10 is fixed to the adjusting rod 11 by bolts.

[0072] The second embodiment of the present invention, see Figure 1-14 , provides a spiral steel pipe billet size detection method, based on a spiral steel pipe billet size real-time detection device, including the following steps:

[0073] Step S1, aligning the center of the annular frame device 9 fixing the laser ranging sensor 12 with the center of the tube blank;

[0074] Step S2, initializing the diameter data of the tube blank as D', connecting the center points of the corresponding laser ranging sensors 12 in the plurality of the first data groups to form a plurality of triangles;

[0075] Step S3, obtaining data measured by the plurality of laser ranging sensors 12 as the first data X n ;

[0076] Wherein, n is the number of the laser ranging sensors 12;

[0077] Step S4: compare the three first data X corresponding to each laser distance measuring sensor 12 and the laser distance measuring sensor 12 separated from it by one laser distance measuring sensor 12. n as a plurality of first data groups;

[0078] Step S5, using trigonometric function to calculate an angle α of the triangle according to the triangle and the corresponding first data group and D', and using trigonometric function to calculate a plurality of diameter data D and ovality data of the tube blank according to the first data group, α and D';

[0079] Step S6, taking the average of the plurality of diameter data D as final diameter data, taking the average of the plurality of ovality data as final ovality data, and outputting circumference data according to the final diameter data;

[0080] Step S7, inputting the circumference data and the final ovality data into a PLC controller to determine whether they meet the standards;

[0081] If it meets the requirements, no signal is sent;

[0082] If it does not meet the requirements, an alarm signal will be issued.

[0083] Wherein, the ellipticity and circumference required by the standard process are uploaded to the PLC controller in advance.

[0084] The method for aligning the center of the annular frame device 9 with the center of the tube blank is as follows:

[0085] Step S11, fixing the fixed base 1 on the mounting surface on the tube blank outlet side of the universal spiral steel tube former turntable by bolt connection, at this time, the annular frame is installed outside the tube blank and has not yet wrapped the tube blank;

[0086] Step S12, take out the first positioning pin 21 in the annular frame device 9, then open the spring lock buckle 22, and finally remove the second semicircular frame 15, the second connecting support 17, and the fourth positioning pin shaft 19 as a whole;

[0087] Step S13, adjusting the lifting and lowering of the linear slide 6, and finally making the center of the annular frame device 9 highly coincide with the center of the spiral steel pipe blanks of different diameters by observing the scale pointer 7 and the steel ruler 5 installed on the column 3;

[0088] Step S14, adjusting the slewing bearing 4 so that the remaining first semicircular frame 14, the first connecting support 16, and the third positioning pin 18 in the annular frame device 9 pass through the tube blank, and the center of the annular frame device 9 is parallel to the center of the tube blank;

[0089] Step S15, insert the second semicircular frame 15, the second connecting support 17, and the end of the second semicircular frame 15 in the fourth positioning pin 19 away from the fixed base 1 into the second positioning pin 20 of the first semicircular frame 14, and then rotate the second semicircular frame 15 to make the positioning plate of the end of the second semicircular frame 15 close to the fixed base 1 fit with the positioning plate of the end of the first semicircular frame 14 close to the fixed base 1, and finally insert the first positioning pin 21 and close the spring lock buckle 22 parts, so that the annular frame device 9 is wrapped around the outer circumference of the tube blank as a whole;

[0090] Step S16, adjust the bolts between the support 2 and the fixed base 1, and fine-tune the lateral relative position of the support 2 and the fixed base 1 to ensure that the center of the annular frame device 9 coincides with the center of the spiral steel pipe blank; at this point, the annular frame device 9 coincides with the theoretical center of the spiral steel pipe blank.

[0091] For example, when measuring the diameter of spiral steel pipes of different specifications, based on steps S11-S16, the cross section of the annular frame device 9 is made perpendicular to the axis of the steel pipe by adjusting the rotation of the slewing support 4, so as to minimize the influence of the angle error between the annular frame device and the axis of the steel pipe on the measurement result; then, by adjusting the position of the moving end of the linear slide 6 and the lateral relative position of the support 2 and the bald base 1, the center of the annular frame device 9 is made to coincide with the theoretical axis center of the steel pipe; finally, the position of the adjusting rod 11 is adjusted so that the theoretical distances of the eight circumferentially evenly distributed laser ranging sensors 12 from the outer surface of the tube blank are consistent, and the adjustment method is as follows: a scale is provided on the adjusting rod 11, and the position of the adjusting rod 11 is adjusted so that the distances extended on the connecting block 10 are equal;

[0092] Assuming that the diameter is D', and D' is ensured to be greater than the diameter of the tube blank by 100 mm, when the produced spiral steel tube passes through the annular frame device 9, the eight laser distance measuring sensors 12 evenly distributed on the annular device can respectively measure the distances X1, X2, X3, X4, X5, X6, X7, and X8 from the outer surface of the steel tube, that is, the first data X n .according to Figure 7 The geometric relationship shown in the figure is that the data measured by the laser ranging sensor 12 at the corresponding positions of A1, A3, and A7 are used as the first data group: X1, X3, and X7. The trigonometric function relationship is used to calculate α=arctanC1O / B1O=arctan(D' / 2-X7) / (D' / 2-X1) in the triangle B1OC1. At the same time, there is a geometric relationship of α'=α in the triangle B1F1E1 and the triangle B1OC1. Therefore, the trigonometric function relationship can be used to calculate the steel pipe diameter D1=B1E1=B1F1 / COSα'=B1F1 / COSα=(F1O 2 +B1O 2 ) 1 / 2 / COSα=

(D' / 2-X3) 2 +(D' / 2-X1) 2

[0093] Although the various steps in the above embodiment are described in the above-mentioned order, those skilled in the art can understand that in order to achieve the effect of this embodiment, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in a reverse order. These simple changes are within the scope of protection of the present invention.

[0094] The terms "first", "second", etc. are used to distinguish similar objects rather than to describe or indicate a particular order or sequence.

[0095] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0096] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A real-time detection device for the size of a spiral steel pipe blank, characterized in that: The device comprises: a fixed base (1), a support (2), a column (3), a linear slide (6), a ring frame device (9), and a laser distance sensor (12); The lower surface of the fixed base (1) is fixed to the turntable of the spiral steel pipe former, and the upper surface of the fixed base (1) is detachably fixedly connected to the support (2); the column (3) is rotatably connected to the support (2); the linear slide (6) is drivingly connected to the column (3); the annular frame device (9) is connected to the linear slide (6); the laser distance sensor (12) is connected to the annular frame device (9), and the laser distance sensor (12) is used to measure the size of the spiral steel pipe blank.

2. The device for real-time detection of the size of a spiral steel pipe blank according to claim 1 is characterized in that: The support (2) is rotatably connected to the column (3) via a slewing bearing (4); the support (2) is fixed to the fixed bottom surface of the slewing bearing (4); the movable top surface of the slewing bearing (4) is bolted to the bottom surface of the column (3); the slewing bearing (4) is drivably connected to the first drive assembly (13); and the first drive assembly (13) is fixed to the fixed bottom surface of the slewing bearing (4).

3. The device for real-time detection of the size of a spiral steel pipe blank according to claim 2 is characterized in that: The linear slide (6) comprises a movable end and a fixed end; The fixed end of the linear slide (6) is fixed to the column (3) by bolts, the movable end of the linear slide (6) is connected to the annular frame device (9), the movable end of the linear slide (6) is drivingly connected to the second drive component (24), and the second drive component (24) is fixed to the column (3).

4. The device for real-time detection of spiral steel pipe blank size according to claim 3 is characterized in that: The movable end of the linear slide (6) is connected to the annular frame device (9) through a measuring mechanism, and the measuring device comprises a steel ruler (5), a ruler pointer (7), a connecting seat (8), a connecting block (10), and an adjusting rod (11); The steel ruler (5) is fixed to the column (3), the scale pointer (7) and the connecting seat (8) are fixed to the movable end of the linear slide (6), the scale pointer (7) points to the steel ruler (5), the connecting seat (8) is fixed to the annular frame device (9), a plurality of connecting blocks (10) are evenly fixed on the annular frame device (9), the adjusting rod (11) is fixed on the connecting block (10), and the adjusting rod (11) is fixed to the laser distance sensor (12).

5. The device for real-time detection of spiral steel pipe blank size according to claim 4 is characterized in that: The connecting seat (8) is fixed to the annular frame device (9) via a first positioning pin shaft (23).

6. The device for real-time detection of spiral steel pipe blank size according to claim 5 is characterized in that: The annular frame device (9) comprises a first semicircular frame (14), a second semicircular frame (15), a first connecting support (16), a second connecting support (17), a second positioning pin shaft (20), a first positioning pin (21), and a spring lock buckle (22); One end of the first semicircular frame (14) away from the fixed base (1) is fixed to the first connecting support (16), and one end of the second semicircular frame (15) away from the fixed base (1) is fixed to the second connecting support (17), and the first connecting support (16) and the second connecting support (17) are fixed by a second positioning pin shaft (20); The ends of the first semicircular frame (14) and the second semicircular frame (15) close to the fixed base (1) are fixed by means of the first positioning pin (21) and the spring lock buckle (22).

7. The device for real-time detection of spiral steel pipe blank size according to claim 6 is characterized in that: One end of the first semicircular frame (14) away from the fixed base (1) is fixed to the first connecting support (16) via a third positioning pin (18).

8. The device for real-time detection of spiral steel pipe blank size according to claim 7 is characterized in that: One end of the second semicircular frame (15) away from the fixed base (1) is fixed to the second connecting support (17) via a fourth positioning pin (19).

9. The device for real-time detection of spiral steel pipe blank size according to claim 8, characterized in that: The laser measurement sensor (12) is fixed to the adjustment rod (11) via bolts, and the connection block (10) is fixed to the adjustment rod (11) via bolts.

10. A method for detecting the size of a spiral steel tube blank, based on a real-time detection device for the size of a spiral steel tube blank according to any one of claims 1 to 9, characterized in that: The steps include: Step S1, aligning the center of the annular frame device (9) for fixing the laser distance sensor (12) with the center of the tube blank; Step S2, initializing the diameter data of the tube blank as D', connecting the center points of the corresponding laser distance measuring sensors (12) in a plurality of the first data groups to form a plurality of triangles; Step S3, obtaining data measured by a plurality of laser distance measuring sensors (12) as first data X n ; Wherein, n is the number of the laser ranging sensors (12); Step S4: combine the three first data X corresponding to each laser distance measuring sensor (12) and the laser distance measuring sensor (12) separated from it by one laser distance measuring sensor (12) n as a plurality of first data groups; Step S5, using trigonometric function to calculate an angle α of the triangle according to the triangle and the corresponding first data group and D', and using trigonometric function to calculate a plurality of diameter data D and ovality data of the tube blank according to the first data group, α and D'; Step S6, taking the average of the plurality of diameter data D as final diameter data, taking the average of the plurality of ovality data as final ovality data, and outputting circumference data according to the final diameter data; Step S7, inputting the circumference data and the final ovality data into a PLC controller to determine whether they meet the standards; If it meets the requirements, no signal is sent; If it does not meet the requirements, an alarm signal will be issued.

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