Device for measuring out-of-roundness of steel pipe

Abstract

The utility model discloses a device for measuring the out-of-roundness of a steel pipe, and belongs to the technical field of steel pipe measuring equipment. The device for measuring the out-of-roundness of the steel pipe comprises eight linear bearings, two first supports, two second supports, two third supports, two fourth supports, two first measuring rods, two second measuring rods, thirty-two first screws, twenty-four second screws and four connecting rods, and can achieve the purpose of measuring the out-of-roundness of the steel pipe. And the device has the characteristics of low manufacturing cost, simplicity in operation and good use effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel pipe measuring equipment, and in particular relates to a device for measuring the out-of-roundness of a steel pipe. Background Art

[0002] At present, steel pipes are usually produced by hot-rolled piercing + continuous pipe rolling + tension reducing process, and then cut to length after natural cooling; due to the combined influence of factors such as the roll hole type of the pipe rolling unit or the reducing unit, the steel pipe may have a certain degree of out-of-roundness, which will directly affect the thread processing accuracy or chamfer processing accuracy of the pipe end, which requires the out-of-roundness of the steel pipe to be measured one by one in order to pick out the steel pipes that do not meet the accuracy requirements; in view of this, some companies have successively developed measuring rulers, measuring gauges or measuring devices for the out-of-roundness of steel pipes, but these measuring devices have more or less certain limitations, some of which are relatively difficult to operate, some have relatively limited measurement accuracy, and some have relatively high manufacturing costs.

[0003] After searching, it was found that three literature patents are most relevant to the utility model technology, and the specific contents are described as follows:

[0004] Patent document CN201120336880.1 discloses a steel pipe out-of-roundness measuring ruler, which mainly includes a base, a screw sleeve, a guide column, a spring, a scale rod, a probe, a roller, a retaining spring, a scale window and an extension rod. The device has relatively good applicability, and the measurement efficiency and measurement accuracy are also relatively high. Since the device is based on built-in measurement, the operation difficulty of the device is relatively large.

[0005] Patent document CN202110790427.6 discloses a universal steel pipe local non-roundness measuring gauge and measuring method, which mainly includes a display screen, a curvature plate bracket, a template wheel, a digital display value zero setting key, a horizontal ruler, a fixing screw, a tensioning spring, a template and a measuring rod. The device is cleverly designed and easy to operate. By adjusting the spacing between the template wheels at both ends and comparing with parameters such as the standard arc length of the steel pipe, the deviation of the local non-roundness of the steel pipe is indirectly described. Since the measuring rod is based on the design principle of a vernier caliper, the measurement accuracy of the device is relatively limited.

[0006] Patent document CN202410171539.7 discloses a device and method for measuring the out-of-roundness of a steel pipe, which mainly includes a frame, a paper strip, a turntable, gears, rollers, a detection rod, a screw, a barrel cam, a guide column, a spring, a transmission assembly, a spline shaft, a spline sleeve, a walking wheel, an adjustment rod, a motor, a tensioning wheel, an electric push rod, a rotating shaft and a bracket. The device has a relatively high degree of automation, and the measurement efficiency and measurement accuracy are also relatively high. Since the design of the device is relatively complex, the manufacturing cost of the device is relatively high. Utility Model Content

[0007] In order to overcome one or more problems existing in the prior art, the utility model provides a device for measuring the out-of-roundness of a steel pipe. The utility model adopts a symmetrical structure for design. The use of the third bracket can realize the setting of the connecting rod along the vertical direction; the combined use of the first bracket and the second screw can realize the relative setting of the third bracket; the combined use of the second bracket, the third bracket and the second screw can realize the precise positioning of the steel pipe; the combined use of the linear bearing, the first screw and the connecting rod can realize the movement of the fourth bracket according to a predetermined trajectory; the combined use of the two first scale segments of the two first measuring rods and the two fifth bosses of the two third brackets can form two spiral micrometers, and the combined use of the two second scale segments of the two second measuring rods and the two ninth bosses of the two fourth brackets can also form two spiral micrometers, so that the diameter of the steel pipe along the vertical direction and the horizontal direction can be accurately measured; due to the maximum diameter D max and minimum diameter D min Usually appear in pairs in a vertical manner, on a line with a suspected maximum diameter D max or minimum diameter D min There is a very high possibility that there is a line with the smallest diameter D in the vertical direction. min or maximum diameter D max Therefore, the use effect of the device of the utility model is relatively good.

[0008] The technical solution adopted by the utility model to solve its technical problem is as follows.

[0009] The device for measuring the out-of-roundness of a steel pipe provided by the utility model comprises eight linear bearings, two first brackets, two second brackets, two third brackets, two fourth brackets, two first measuring rods, two second measuring rods, thirty-two first screws, twenty-four second screws and four connecting rods;

[0010] The linear bearing is composed of a second body and a second boss connected together, and the second boss is located on the upper end surface of the second body; the second body is a rectangular parallelepiped symmetrical structure, and the second body is symmetrically provided with four cylindrical first through holes, and the first through holes are penetrated with the first screws; the second boss is a cylindrical symmetrical structure, and the axis position of the second boss is provided with a cylindrical second through hole, and the second through hole is penetrated with the connecting rod, and the second through hole also runs through the second body; a retaining frame, a ball and a retaining ring are also provided in the second boss, and a plurality of the balls are evenly arranged in the retaining frame, and the retaining rings are provided at both ends of the retaining frame;

[0011] The first bracket is composed of two third bodies and two third bosses connected together, the third bodies and the third bosses are both rectangular parallelepiped symmetrical structures, and the two third bosses are simultaneously located between the two third bodies; the third body is symmetrically provided with four first screw holes, and the second screws are screwed into the first screw holes;

[0012] The second bracket is composed of a fourth body and four fourth bosses connected together, the four fourth bosses are arranged opposite to each other in pairs and are simultaneously located on the upper end surface of the fourth body; the fourth body is a rectangular parallelepiped symmetrical structure, a cylindrical third through hole is opened at the center of the fourth body, and the fifth boss of the third bracket is penetrated in the third through hole; the fourth body is symmetrically opened with four second screw holes, and the second screws are screwed in the second screw holes; the fourth boss is a triangular prism symmetrical structure, which is used to clamp the steel pipe;

[0013] The third bracket is composed of a fifth body, two fifth bosses and four sixth bosses connected together, the two fifth bosses are arranged oppositely and are respectively located on the upper and lower end surfaces of the fifth body, and the four sixth bosses are arranged oppositely in pairs and are simultaneously located on the upper end surface of the fifth body; the fifth body is a rectangular parallelepiped symmetrical structure, the fifth body is symmetrically provided with two groups of eight cylindrical fourth through holes, and the second screws are penetrated in the fourth through holes; the fifth body is symmetrically provided with four cylindrical fifth through holes, and the second screws are penetrated in the fifth through holes; the fifth boss is a cylindrical symmetrical structure, and the side surface of the fifth boss is evenly marked with fifty grid scales along the circumferential direction; a third screw hole is provided at the axis position of the fifth boss, the first measuring rod is screwed into the third screw hole, and the third screw hole also runs through the fifth body; the sixth boss is a cylindrical symmetrical structure, the axis position of the sixth boss is provided with a cylindrical groove, and the end of the connecting rod is penetrated in the groove;

[0014] The fourth bracket is composed of a seventh body, four eighth bosses and a ninth boss, the four eighth bosses are arranged opposite to each other in pairs and are respectively located on the front and rear end surfaces of the seventh body, and one ninth boss is located on the left end surface of the seventh body; the seventh body and the eighth boss are both rectangular parallelepiped symmetrical structures, a cylindrical sixth through hole is opened at the center of the eighth boss, and the second boss of the linear bearing is penetrated in the sixth through hole; four fifth screw holes are evenly opened around the sixth through hole, and the first screw is screwed in the fifth screw hole; the ninth boss is a cylindrical symmetrical structure, and the side surface of the ninth boss is evenly marked with fifty grid scales along the circumferential direction; a fourth screw hole is opened at the axis position of the ninth boss, and the second measuring rod is screwed in the fourth screw hole, and the fourth screw hole also runs through the seventh body;

[0015] The first measuring rod is composed of three parts: a coaxial first contact section, a first thread section and a first scale section. The first contact section is a cylindrical symmetrical structure for contacting a steel pipe; the first thread section is a cylindrical symmetrical structure with a thread on the side, for screwing the third screw hole of the third bracket, and the pitch value of the thread is 0.5 mm; the first scale section is a cylindrical symmetrical structure, and the side of the cylinder is evenly marked with four groups of scales along the circumferential direction, each group of scales is composed of two adjacent left and right columns of misaligned scales, the misalignment value of the two columns of misaligned scales is 0.5 mm, and the minimum grid value of the misaligned scales is 1 mm;

[0016] The second measuring rod is composed of three parts: a coaxial second contact section, a second threaded section and a second scale section. The second contact section is a cylindrical symmetrical structure for contacting the steel pipe; the second threaded section is a cylindrical symmetrical structure with a thread on the side, which is used to screw into the fourth screw hole of the fourth bracket, and the pitch value of the thread is 0.5mm; the second scale section is a cylindrical symmetrical structure, and the side surface of the cylinder is evenly marked with four groups of scales along the circumferential direction, each group of scales consists of two adjacent upper and lower rows of staggered scales, the staggered value of the two rows of staggered scales is 0.5mm, and the minimum grid value of the staggered scales is 1mm.

[0017] In some embodiments, the first screw is composed of a coaxial first body and a first boss, the first body and the first boss are both cylindrical symmetrical structures, and the first boss is located at the lower end surface of the first body; the end of the first boss is provided with a thread for screwing into the fifth screw hole of the fourth bracket.

[0018] In some embodiments, the second screw is composed of a coaxial sixth body and a seventh boss, the sixth body and the seventh boss are both cylindrical symmetrical structures, and the seventh boss is located on the lower end surface of the sixth body; the end of the seventh boss is provided with a thread for screwing into the first screw hole of the first bracket or the second screw hole of the second bracket.

[0019] In some embodiments, the connecting rod is a cylindrical symmetrical structure, the two ends of the connecting rod are inserted into the grooves of the third bracket, and the middle portion of the connecting rod is inserted into the second through hole of the linear bearing.

[0020] The beneficial effects of the utility model are as follows:

[0021] 1) The device of the utility model includes eight linear bearings, two first brackets, two second brackets, two third brackets, two fourth brackets, two first measuring rods, two second measuring rods, thirty-two first screws, twenty-four second screws and four connecting rods. Since the material is common and easy to process and shape, the manufacturing cost of the device of the utility model is relatively low.

[0022] 2) When the device of the utility model is used, the original distance Y between the two first measuring rods and the original distance X between the two second measuring rods are measured. The utility model is set on the part of the steel pipe that needs to be measured, and the two first measuring rods are screwed in respectively. When the two first contact sections both contact the surface of the steel pipe along the vertical direction, the screwing in of the two first measuring rods is stopped, and △3 and △4 are read; along the four connecting rods, the two fourth brackets are moved simultaneously to the position where the two second measuring rods are facing the steel pipe, and the two second measuring rods are screwed in respectively. When the two second contact sections both contact the surface of the steel pipe along the horizontal direction, the screwing in of the two second measuring rods is stopped, and △1 and △2 are read. Substitute them into the formula to calculate a set of data D x1 and D y1 ; Rotate the two first measuring rods and the two second measuring rods to the zero scale position, rotate the steel pipe 45 degrees clockwise, and put the utility model on the part of the steel pipe to be measured again, and repeat the above steps to calculate another set of data D x2 and D y2 ; Find the maximum diameter D max and minimum diameter D min , and the calculation can be performed, so the operation of the device of the utility model is relatively simple.

[0023] 3) The device of the utility model is designed with a symmetrical structure. The use of the third bracket can realize the setting of the connecting rod along the vertical direction; the combined use of the first bracket and the second screw can realize the relative setting of the third bracket; the combined use of the second bracket, the third bracket and the second screw can realize the precise positioning of the steel pipe; the combined use of the linear bearing, the first screw and the connecting rod can realize the movement of the fourth bracket according to the predetermined trajectory; the combined use of the two first scale segments of the two first measuring rods and the two fifth bosses of the two third brackets can form two spiral micrometers, and the combined use of the two second scale segments of the two second measuring rods and the two ninth bosses of the two fourth brackets can also form two spiral micrometers, so that the diameter of the steel pipe along the vertical direction and the horizontal direction can be accurately measured; due to the maximum diameter D max and minimum diameter D min Usually appear in pairs in a vertical manner, on a line with a suspected maximum diameter D max or minimum diameter D min There is a very high possibility that there is a line with the smallest diameter D in the vertical direction. min or maximum diameter D max Therefore, the use effect of the device of the utility model is relatively good.

[0024] By adopting the device for measuring the out-of-roundness of a steel pipe provided by the utility model, the purpose of measuring the out-of-roundness of the steel pipe can be achieved by measuring multiple groups of mutually perpendicular diameters. The device of the utility model has the characteristics of low manufacturing cost, simple operation and good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the main structure of the device for measuring the out-of-roundness of a steel pipe of the utility model before measurement;

[0026] Figure 2 This is a left-side structural schematic diagram of the device for measuring the out-of-roundness of a steel pipe of the utility model before measurement;

[0027] Figure 3 This is a schematic diagram of the top view of the device for measuring the out-of-roundness of a steel pipe before measurement;

[0028] Figure 4 This is a schematic diagram of the main structure of the device for measuring the out-of-roundness of a steel pipe of the utility model during measurement;

[0029] Figure 5 It is a schematic diagram of the main structure of the assembly relationship of some components of the utility model;

[0030] Figure 6 This is a schematic diagram of the main structure of the first screw of the utility model;

[0031] Figure 7This is a schematic diagram of the main structure of the linear bearing of the utility model;

[0032] Figure 8 It is a schematic diagram of the top view of the linear bearing of the utility model;

[0033] Fig. 9 It is a left-side structural schematic diagram of the first bracket of the utility model;

[0034] Fig.10 It is a schematic diagram of the top view of the structure of the first bracket of the utility model;

[0035] Fig.11 This is a schematic diagram of the main structure of the second bracket of the utility model;

[0036] Fig.12 It is a schematic diagram of the top view of the second bracket of the utility model;

[0037] Fig.13 This is a schematic diagram of the main structure of the first measuring rod of the utility model;

[0038] Fig.14 This is a schematic diagram of the main structure of the third bracket of the utility model;

[0039] Fig.15 It is a schematic diagram of the top view of the structure of the third bracket of the utility model;

[0040] Fig.16 This is a schematic diagram of the main structure of the second screw of the utility model;

[0041] Fig.17 This is a schematic diagram of the main structure of the fourth bracket of the utility model;

[0042] Fig.18 It is a left-side structural schematic diagram of the fourth bracket of the utility model;

[0043] Fig.19 It is a schematic diagram of the top view of the structure of the fourth bracket of the utility model;

[0044] Fig. 20 This is a schematic diagram of the main structure of the second measuring rod of the utility model;

[0045] Fig.21 It is a schematic diagram of the working principle of the device for measuring the out-of-roundness of a steel pipe of the utility model when measuring the vertical diameter;

[0046] Fig. 22 It is a schematic diagram of the working principle of the device for measuring the out-of-roundness of a steel pipe of the utility model when the density is measured to be one;

[0047] Fig.23It is a schematic diagram of the working principle of the device for measuring the out-of-roundness of a steel pipe of the utility model when the density is measured to be two;

[0048] Fig.24 It is a schematic diagram of the working principle of the device for measuring the out-of-roundness of a steel pipe of the utility model when the density is three;

[0049] Fig.25 It is a schematic diagram of the working principle of the device for measuring the out-of-roundness of a steel pipe of the utility model when the density is measured to be five;

[0050] Fig.26 The utility model is a schematic diagram of the working principle of the device for measuring the out-of-roundness of a steel pipe when the density is measured to be six.

[0051] Description of reference numerals: 1-first screw; 101-first body; 102-first boss; 2-linear bearing; 201-second body; 202-second boss; 203-first through hole; 204-second through hole; 3-first bracket; 301-third body; 302-third boss; 303-first screw hole; 4-second bracket; 401-fourth body; 402-fourth boss; 403-third through hole; 404-second screw hole; 5-first measuring rod; 501-first contact section; 502-first threaded section; 503-first scale section; 6-third bracket; 601-fifth body; 602-fifth boss; 603-sixth boss; 604-third screw hole; 605-fourth through hole; 606-groove; 607-fifth through hole; 7-second screw; 701-sixth body; 702-seventh boss; 8-fourth bracket; 801-seventh body; 802-eighth boss; 803-ninth boss; 804-fourth screw hole; 805-sixth through hole; 806-fifth screw hole; 9-second measuring rod; 901-second contact section; 902-second threaded section; 903-second scale section; 10-connecting rod; 11-steel pipe. DETAILED DESCRIPTION

[0052] The content of the utility model is described in detail below through examples and drawings. The examples are only used to understand the utility model, but are not intended to limit the content of the utility model.

[0053] Combination Figures 1 to 5As shown, the utility model provides a device for measuring the out-of-roundness of a steel pipe, which includes eight linear bearings 2, two first brackets 3, two second brackets 4, two third brackets 6, two fourth brackets 8, two first measuring rods 5, two second measuring rods 9, thirty-two first screws 1, twenty-four second screws 7 and four connecting rods 10; wherein, two first brackets 3 arranged oppositely are inserted between two fifth bodies 601 of the two third brackets 6 arranged oppositely, and are connected by sixteen second screws 7; two second brackets 4 arranged oppositely are also inserted between two fifth bodies 601 of the two third brackets 6, and are connected by eight second screws 7 is connected; eight end portions of four connecting rods 10 are inserted into the eight grooves 606 of the two third brackets 6, and four middle portions of the four connecting rods 10 are inserted into the eight second through holes 204 of the eight linear bearings 2 arranged opposite to each other; eight second bosses 202 of the eight linear bearings 2 are inserted into the eight sixth through holes 805 of the two oppositely arranged fourth brackets 8, and are connected by thirty-two first screws 1; two first measuring rods 5 are screwed into the two third screw holes 604 of the two third brackets 6, and two second measuring rods 9 are screwed into the two fourth screw holes 804 of the two fourth brackets 8.

[0054] The assembly process of the device for measuring the out-of-roundness of a steel pipe provided by the utility model

[0055] Combination Figures 1 to 20 As shown, firstly, the eight second bosses 202 of the eight linear bearings 2 are inserted into the eight sixth through holes 805 of the two fourth brackets 8, and the thirty-two first through holes 203 of the eight linear bearings 2 and the thirty-two fifth screw holes 806 of the two fourth brackets 8 are aligned, and then the thirty-two first screws 1 are passed through the thirty-two first through holes 203 and screwed into the thirty-two fifth screw holes 806. In this way, the eight linear bearings 2 and the two fourth brackets 8 can be assembled by the thirty-two first screws 1;

[0056] Then, the openings of the grooves 606 of the two third brackets 6 are arranged upward on the mounting platform, and then the two second brackets 4 are arranged on the two fifth bodies 601 of the two third brackets 6, and at the same time, the two fifth bosses 602 of the two third brackets 6 are inserted into the two third through holes 403 of the two second brackets 4, and the eight second screw holes 404 of the two second brackets 4 and the eight fifth through holes 607 of the two third brackets 6 are aligned, and then eight second screws 7 are passed through the eight fifth through holes 607 and screwed into the eight second screw holes 404, so that the two second brackets 4 and the two third brackets 6 can be assembled by the eight second screws 7;

[0057] Then, two first brackets 3 are simultaneously arranged on the mounting platform, and then the opening of the groove 606 of one third bracket 6 is arranged downward on the two third bodies 301 on which the two first brackets 3 are located, and the eight first screw holes 303 on which the two first brackets 3 are located are aligned with the eight fourth through holes 605 of the third bracket 6, and then the other eight second screws 7 are passed through the eight fourth through holes 605 and screwed into the eight first screw holes 303, so that the two first brackets 3 and one third bracket 6 can be assembled by the other eight second screws 7;

[0058] Then, the two first brackets 3 and the one third bracket 6 after assembly are turned upside down as a whole, and then the four ends of the four connecting rods 10 are respectively inserted into the four grooves 606 of the third bracket 6, and then the eight linear bearings 2 are sleeved outside the four middle parts of the four connecting rods 10 through the eight second through holes 204. In this way, the eight linear bearings 2 and the one third bracket 6 can be assembled through the four connecting rods 10;

[0059] Then, the opening of the groove 606 of the other third bracket 6 is downwardly arranged on the two third bodies 301 on which the two first brackets 3 are located, and then the other four ends of the four connecting rods 10 are respectively inserted into the four grooves 606 of the third bracket 6. At this time, the eight first screw holes 303 on the upper sides of the two first brackets 3 must be aligned with the eight fourth through holes 605 of the third bracket 6, and then the remaining eight second screws 7 are passed through the eight fourth through holes 605 and screwed into the eight first screw holes 303. In this way, the two first brackets 3 and the other third bracket 6 can be assembled by the remaining eight second screws 7;

[0060] Then the two first threaded sections 502 of the two first measuring rods 5 are respectively screwed into the two third screw holes 604 of the two third brackets 6, and finally the two second threaded sections 902 of the two second measuring rods 9 are respectively screwed into the two fourth screw holes 804 of the two fourth brackets 8. In this way, the whole device is assembled and can be put into use.

[0061] The working principle of the device for measuring the out-of-roundness of a steel pipe provided by the utility model

[0062] Combination Figure 4 As shown, the device for measuring the out-of-roundness of a steel pipe provided by the utility model can be sleeved on the steel pipe 11. Since the symmetrical structure is adopted for design, and the four fourth bosses 402 of the second bracket 4 are a triangular prism-shaped symmetrical structure, the four fourth bosses 402 located on the upper side can hang the device of the utility model on the steel pipe 11 by virtue of their own gravity. At this time, the four fourth bosses 402 can clamp the steel pipe 11 in the vertical direction, thereby achieving the purpose of centering the steel pipe 11 in the horizontal direction.

[0063] Let the nominal diameter of the steel pipe 11 be D, the out-of-roundness of the steel pipe 11 be T, and the maximum diameter of the steel pipe 11 be D. max , the minimum diameter of the steel pipe 11 is set to D min According to the calculation formula of the out-of-roundness of the steel pipe, T = (D max -D min ) / D×100%; for an ellipse, the maximum diameter D max is the major axis and the minimum diameter D min is the minor axis. Since the major axis and minor axis of the ellipse are perpendicular to each other, the maximum diameter D max and minimum diameter D min Usually appear in pairs with perpendicular diameters, so based on visual observation, if a suspected maximum diameter D is found max or minimum diameter D min , then, in the vertical direction, there is a very likely opposite line with the suspected minimum diameter D min or maximum diameter D max ;

[0064] Combination Fig.21 As shown, when measuring the diameter of the steel pipe 11 along the horizontal direction, the second measuring rod 9 at the left position and the second measuring rod 9 at the right position both maintain a tangent relationship with the steel pipe 11; the original distance between the two second contact segments 901 of the left and right second measuring rods 9 at the zero scale position is set to X, and the diameter of the steel pipe 11 along the horizontal direction is set to D x, the second measuring rod 9 at the left is set as ①, the second measuring rod 9 at the right is set as ②, and the precession distances of ① and ② are set as △1 and △2 respectively; according to the knowledge that the distances between parallel lines are equal everywhere, that is, X=△1+D x +△2, sorted to get D x =X-△1-△2;

[0065] Combination Fig.21 As shown, when measuring the diameter of the steel pipe 11 along the vertical direction, the first measuring rod 5 at the upper position and the first measuring rod 5 at the lower position both maintain a tangent relationship with the steel pipe 11; the original distance between the two first contact segments 501 of the upper and lower first measuring rods 5 at the zero scale position is set to Y, and the diameter of the steel pipe 11 along the vertical direction is set to D y , set the first measuring rod 5 at the upper position to ③, set the first measuring rod 5 at the lower position to ④, set the precession distances of ③ and ④ to △3 and △4 respectively; according to the knowledge that the distances between parallel lines are equal everywhere, that is, Y=△3+D y +△4, sorted to get D y =Y-△3-△4;

[0066] Combination Fig. 22 As shown, if two diameters are evenly distributed on the end surface of the steel pipe 11, the angle between the two diameters is 90 degrees; x1 and D y1 perpendicular to each other, i.e. D x1 and D y1 The angles between them are all 90 degrees, which needs to be measured once, so that a set of measurement data D can be obtained. x1 and D y1 , let’s define the measurement density as 1; for the convenience of description, let’s assume that D x1 <D y1 , that is, D min =D x1 , D max =D y1 , then T=100%×(D y1 -D x1 ) / D;

[0067] Combination Fig.23 As shown, if you want to improve the reliability of the data, you should increase the measurement density; if you want to use four diameters evenly distributed on the end face of the steel pipe 11, the angles between the four diameters are all 45 degrees; you need to rotate the steel pipe 11 clockwise 45 degrees / time, and perform a second measurement, so that you can get two sets of measurement data D x1 , D y1 , D x2and D y2 , let’s define the measurement density as 2; for the convenience of description, let’s assume that D x1 <…… <D y2 , that is, D min =D x1 , D max =D y2 , then T=100%×(D y2 -D x1 ) / D;

[0068] Combination Fig.24 As shown, if six diameters are evenly distributed on the end surface of the steel pipe 11, the angles between the six diameters are all 30 degrees; the steel pipe 11 needs to be rotated 30 degrees clockwise each time and measured three times, so that three sets of measurement data D can be obtained. x1 , D y1 , D x2 , D y2 , D x3 and D y3 , let’s define the measurement density as three; for the convenience of description, let’s assume that D x1 <…… <D y3 , that is, D min =D x1 , D max =D y3 , then T=100%×(D y3 -D x1 ) / D;

[0069] Combination Fig.25 As shown, if ten diameters are evenly distributed on the end surface of the steel pipe 11, the angles between the ten diameters are all 18 degrees; the steel pipe 11 needs to be rotated 18 degrees clockwise each time and measured five times, so that five sets of measurement data D can be obtained. x1 , D y1 , D x2 , D y2 , D x3 , D y3 , D x4 , D y4 , D x5 and D y5 , let’s define the measurement density as five; for the convenience of description, let’s assume that D x1 <…… <D y5 , that is, D min =D x1 , D max =D y5 , then T=100%×(D y5 -D x1 ) / D;

[0070] Combination Fig.26 As shown, if twelve diameters are uniformly distributed on the end surface of the steel pipe 11, the angles between the twelve diameters are all 15 degrees; the steel pipe 11 needs to be rotated 15 degrees / time clockwise and measured six times, so that six sets of measurement data D can be obtained. x1 , D y1 , D x2 , D y2 , D x3 , D y3 , D x4 , D y4 , D x5 , D y5 , D x6 and D y6 , let’s define the measurement density as six; for the convenience of description, let’s assume that D x1 <…… <D y6 , that is, D min =D x1 , D max =D y6 , then T=100%×(D y6 -D x1 ) / D;

[0071] Combination Figures 1 to 4 As shown, the two first scale segments 503 of the two first measuring rods 5 and the two fifth bosses 602 of the two third brackets 6 can be used together to form two screw micrometers, and the measurement accuracy of the two screw micrometers can reach 0.01mm. Reasoning process: Since the pitch value of the thread of the first measuring rod 5 is 0.5mm, that is, the axial distance moved by the first measuring rod 5 in the third screw hole 604 is 0.5mm for each rotation of the first measuring rod 5. Since fifty grid scales are evenly marked on the side surface of the fifth boss 602 along the circumferential direction, the axial distance moved by the first measuring rod 5 in the third screw hole 604 is 0.01mm for each rotation of the first measuring rod 5 by one grid scale.

[0072] Combination Figures 1 to 4As shown, the two second scale segments 903 of the two second measuring rods 9 and the two ninth bosses 803 of the two fourth brackets 8 can be used together to form two screw micrometers, and the measurement accuracy of the two screw micrometers can reach 0.01mm. Reasoning process: Since the pitch value of the thread of the second measuring rod 9 is 0.5mm, that is, the axial distance moved by the second measuring rod 9 in the fourth screw hole 804 is 0.5mm for each rotation of the second measuring rod 9. Since fifty grid scales are evenly marked on the side surface of the ninth boss 803 along the circumferential direction, the axial distance moved by the second measuring rod 9 in the fourth screw hole 804 is 0.01mm for each rotation of the second measuring rod 9 by one grid scale.

[0073] The use process of the device for measuring the out-of-roundness of a steel pipe provided by the utility model

[0074] Step 1: Combine Figure 1 As shown, assuming that the two first measuring rods 5 and the two second measuring rods 9 are initially at the zero scale position, the original distance Y between the two first measuring rods 5 and the original distance X between the two second measuring rods 9 are first measured, and then the utility model is sleeved on the part of the steel pipe 11 that needs to be measured, so as to position the steel pipe 11 along the vertical direction;

[0075] Step 2: Combine Fig.21 As shown, the two first measuring rods 5 are screwed in respectively, and when the two first contact sections 501 both contact the surface of the steel pipe 11 along the vertical direction, the screwing in of the two first measuring rods 5 is stopped; then the screwing in distances △3 and △4 of the two first measuring rods 5 are read, and the formula D y =Y-△3-△4, calculate the corresponding diameter D of the steel pipe 11 along the vertical direction y ;

[0076] Step 3: Combine Fig.21 As shown, then along the four connecting rods 10, the two fourth brackets 8 are simultaneously moved to the position where the two second measuring rods 9 are facing the steel pipe 11, and then the two second measuring rods 9 are screwed in respectively, and when the two second contact sections 901 both contact the surface of the steel pipe 11 along the horizontal direction, the screwing in of the two second measuring rods 9 is stopped; then the screwing in distances △1 and △2 of the two second measuring rods 9 are read, and the formula D is used to calculate the screwing in distances △1 and △2 of the two second measuring rods 9. x =X-△1-△2, calculate the corresponding diameter D of the steel pipe 11 in the horizontal direction x .

[0077] Step 4: Combine Fig.21As shown, the two first measuring rods 5 and the two second measuring rods 9 are rotated to the zero scale position, and the density to be measured is selected according to the needs. Taking the secondary measurement of the vertical diameter as an example, combined with Fig.23 As shown, the steel pipe 11 is then rotated 45 degrees clockwise per time, and then the utility model is again mounted on the portion of the steel pipe 11 that needs to be measured, so that the steel pipe 11 is positioned along the vertical direction, and then steps 2 and 3 are repeated, so that two sets of measurement data D can be obtained. x1 , D y1 , D x2 and D y2 ; Then D x1 , D x2 , D y1 and D y2 Sort them and substitute them into the formula to calculate.

[0078] Supplementary explanation: The device for measuring the out-of-roundness of a steel pipe provided by the utility model is designed with a symmetrical structure. First, according to the diameter specification D of the steel pipe, multiple specifications of the device of the utility model should be designed and manufactured to match it. In this way, for the diameter specification D of a specific steel pipe, rapid centering and measurement can be achieved; the zero scale position refers to the position when the initial scale lines of the two fifth bosses of the two first measuring rods and the two third brackets are aligned, and the initial scale lines of the two ninth bosses of the two second measuring rods and the two fourth brackets are aligned; since the first contact section of the first measuring rod and the second contact section of the second measuring rod both adopt a cylindrical structure, even if there is a certain deviation in the relative position of the steel pipe, it can be ensured that the first contact section and the second contact section can maintain a tangent relationship with the steel pipe.

[0079] It can be seen from the embodiments that the device for measuring the out-of-roundness of a steel pipe provided by the utility model can achieve the purpose of measuring the out-of-roundness of a steel pipe by measuring multiple groups of mutually perpendicular diameters. The device of the utility model has the characteristics of low manufacturing cost, simple operation and good use effect.

[0080] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein.

Claims

1. A device for measuring the out-of-roundness of a steel pipe, characterized in that: The device for measuring the out-of-roundness of a steel pipe comprises: eight linear bearings (2), two first brackets (3), two second brackets (4), two third brackets (6), two fourth brackets (8), two first measuring rods (5), two second measuring rods (9), thirty-two first screws (1), twenty-four second screws (7) and four connecting rods (10), wherein: The linear bearing (2) is composed of a second body (201) and a second boss (202) connected together, and the second boss (202) is located on the upper end surface of the second body (201); the second body (201) is a rectangular parallelepiped symmetrical structure, and the second body (201) is symmetrically provided with four cylindrical first through holes (203), and the first through holes (203) are penetrated with the first screws (1); the second boss (202) is a cylindrical symmetrical structure, and the axis position of the second boss (202) is provided with a cylindrical second through hole (204), and the second through hole (204) is penetrated with the connecting rod (10), and the second through hole (204) also runs through the second body (201); a retaining frame, balls and retaining rings are also provided in the second boss (202), and a plurality of the balls are evenly provided in the retaining frame, and the retaining rings are provided at both ends of the retaining frame; The first bracket (3) is composed of two third bodies (301) and two third bosses (302) connected together, the third bodies (301) and the third bosses (302) are both rectangular parallelepiped symmetrical structures, and the two third bosses (302) are simultaneously located between the two third bodies (301); the third body (301) is symmetrically provided with four first screw holes (303), and the second screws (7) are screwed into the first screw holes (303); The second bracket (4) is composed of a fourth body (401) and four fourth bosses (402) connected together, the four fourth bosses (402) are arranged opposite to each other in pairs and are simultaneously located on the upper end surface of the fourth body (401); the fourth body (401) is a rectangular parallelepiped symmetrical structure, a cylindrical third through hole (403) is provided at the center of the fourth body (401), and a fifth boss (602) of the third bracket (6) is inserted into the third through hole (403); the fourth body (401) is symmetrically provided with four second screw holes (404), and the second screws (7) are screwed into the second screw holes (404); the fourth boss (402) is a triangular prism symmetrical structure, which is used to clamp the steel pipe; The third bracket (6) is composed of a fifth body (601), two fifth bosses (602) and four sixth bosses (603) connected together. The two fifth bosses (602) are arranged opposite to each other and are respectively located on the upper and lower end surfaces of the fifth body (601). The four sixth bosses (603) are arranged opposite to each other in pairs and are simultaneously located on the upper end surface of the fifth body (601). The fifth body (601) is a rectangular parallelepiped symmetrical structure. The fifth body (601) is symmetrically provided with two groups of eight cylindrical fourth through holes (605) in total. The second screws (7) are inserted into the fourth through holes (605). The fifth body (601) is symmetrically provided with four cylindrical fifth through holes (607). , the second screw (7) is inserted into the fifth through hole (607); the fifth boss (602) is a cylindrical symmetrical structure, and the side surface of the fifth boss (602) is evenly marked with fifty grid scales along the circumferential direction; a third screw hole (604) is provided at the axial position of the fifth boss (602), and the first measuring rod (5) is screwed into the third screw hole (604), and the third screw hole (604) also runs through the fifth body (601); the sixth boss (603) is a cylindrical symmetrical structure, and a cylindrical groove (606) is provided at the axial position of the sixth boss (603), and the end of the connecting rod (10) is inserted into the groove (606); The fourth bracket (8) is composed of a seventh body (801), four eighth bosses (802) and a ninth boss (803), the four eighth bosses (802) are arranged opposite to each other in pairs and are respectively located at the front and rear end surfaces of the seventh body (801), and the ninth boss (803) is located at the left end surface of the seventh body (801); the seventh body (801) and the eighth boss (802) are both rectangular parallelepiped symmetrical structures, a cylindrical sixth through hole (805) is opened at the center of the eighth boss (802), and the sixth through hole (805) is penetrated by the straight The second boss (202) of the linear bearing (2); four fifth screw holes (806) are evenly arranged around the sixth through hole (805), and the first screw (1) is screwed into the fifth screw hole (806); the ninth boss (803) is a cylindrical symmetrical structure, and the side surface of the ninth boss (803) is evenly marked with fifty grid scales along the circumferential direction; a fourth screw hole (804) is arranged at the axial position of the ninth boss (803), and the second measuring rod (9) is screwed into the fourth screw hole (804), and the fourth screw hole (804) also runs through the seventh body (801); The first measuring rod (5) is composed of three parts connected together, namely, a coaxial first contact section (501), a first threaded section (502) and a first scale section (503); the first contact section (501) is a cylindrical symmetrical structure, used for contacting a steel pipe; the first threaded section (502) is a cylindrical symmetrical structure with a thread on the side, used for screwing into a third screw hole (604) of the third bracket (6), the pitch value of the thread is 0.5 mm; the first scale section (503) is a cylindrical symmetrical structure, the side of the cylinder is evenly marked with four groups of scales along the circumferential direction, each group of scales is composed of two adjacent left and right columns of offset scales, the offset value of the two columns of offset scales is 0.5 mm, and the minimum grid value of the offset scales is 1 mm; The second measuring rod (9) is composed of three parts connected by a coaxial second contact section (901), a second threaded section (902) and a second scale section (903). The second contact section (901) is a cylindrical symmetrical structure for contacting a steel pipe; the second threaded section (902) is a cylindrical symmetrical structure with a thread on the side, for screwing into the fourth screw hole (804) of the fourth bracket (8), and the pitch value of the thread is 0.5 mm; the second scale section (903) is a cylindrical symmetrical structure, and the side surface of the cylinder is evenly marked with four groups of scales along the circumferential direction, each group of scales is composed of two adjacent upper and lower rows of offset scales, the offset value of the two rows of offset scales is 0.5 mm, and the minimum grid value of the offset scale is 1 mm.

2. The device for measuring the out-of-roundness of a steel pipe according to claim 1, characterized in that: The first screw (1) is composed of a coaxial first body (101) and a first boss (102), the first body (101) and the first boss (102) are both cylindrical symmetrical structures, and the first boss (102) is located on the lower end surface of the first body (101); the end of the first boss (102) is provided with a thread for screwing into the fifth screw hole (806) of the fourth bracket (8).

3. The device for measuring the out-of-roundness of a steel pipe according to claim 1, characterized in that: The second screw (7) is composed of a coaxial sixth body (701) and a seventh boss (702), the sixth body (701) and the seventh boss (702) are both cylindrical symmetrical structures, and the seventh boss (702) is located on the lower end surface of the sixth body (701); the end of the seventh boss (702) is provided with a thread for screwing into the first screw hole (303) of the first bracket (3) or the second screw hole (404) of the second bracket (4).

4. The device for measuring the out-of-roundness of a steel pipe according to claim 1, characterized in that: The connecting rod (10) is a cylindrical symmetrical structure, the two ends of the connecting rod (10) are inserted into the groove (606) of the third bracket (6), and the middle part of the connecting rod (10) is inserted into the second through hole (204) of the linear bearing (2).

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