Device for measuring end face cutting inclination of steel pipe based on opposite swinging

Abstract

The utility model discloses a device for measuring the end face cutting inclination of a steel pipe based on a counter-swing mode, and belongs to the technical field of steel pipe measuring equipment. The device comprises four first supports, two second supports, two third supports, a fourth support, a fifth support, two sixth supports, eight positioning rods, four measuring rods, a rotating shaft, forty screws, two first rolling bearings and four second rolling bearings. The device not only can accurately and stably position the inner surface of the steel pipe, but also can quickly find the cutting slope of the pipe end, so that the cutting slope of the end surface of the steel pipe can be effectively measured and calculated, 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 inclination of the end face of a steel pipe based on a swinging method. Background Art

[0002] At present, seamless steel pipes are usually produced by continuous pipe rolling. In order to improve sawing efficiency, multiple closely packed steel pipes are usually uniformly sawed to a fixed length. If the rotating plane of the circular saw or the sawing plane of the band saw is not perpendicular to the axis of the steel pipe, the pipe end will be cut obliquely. If the steel pipes for butt welding have pipe ends that are cut obliquely, on the one hand, the gap of the butt weld will be wedge-shaped, thereby increasing the difficulty of welding; on the other hand, the straightness of the pipeline will be reduced, thereby increasing the resistance to transportation. Therefore, pipeline welding construction units usually measure the inclination of the steel pipe ends one by one, so as to be able to promptly remove the steel pipes that do not meet the accuracy requirements; usually, manual measurement is performed with the use of a square ruler and a feeler gauge, but the reliability of this measurement method is relatively poor. In view of this, some companies have successively developed pipe end inclination measuring instruments or measuring devices, but these measuring instruments or measuring devices do not have the function of finding the pipe end inclination, which invisibly increases the workload of measurement.

[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 CN 200920106190.X discloses an automatic measuring instrument for the bevel of a steel pipe end, which mainly includes a measuring probe, a spring, a transmission slide rod, a pin, a bracket, a limit pin, a slider, a guide rail, a signal converter, a data cable and a PC terminal. The automation level and measurement accuracy of the patented device are relatively high, but because the patented device cannot quickly find the bevel of the steel pipe end, the bevel can only be determined by screening a large amount of data. Therefore, the workload of the patented device is relatively large.

[0005] Patent document CN 201120394616.3 discloses a device for measuring the bevel of a steel pipe end, which mainly includes a rotating shaft, a cantilever, a guide rail, a sliding rod, a scale, a slider, a spring, a lever arm, a measuring head, a bracket and a pulley. The measurement accuracy of the patented device is relatively high, but because the patented device cannot quickly find the bevel of the steel pipe end, the bevel can only be determined by screening a large amount of data. Therefore, the workload of the patented device is relatively large.

[0006] Patent document CN 201621041797.0 discloses a pipe end bevel measuring device, which mainly includes a control module, a track, a drive wheel, a base plate, a gearbox, a motor, a guide rail, a slider, a lead screw, a cross arm, a support arm, a proximity sensor, a distance sensor and a detection head. The automation level and measurement accuracy of the patented device are relatively high, but because the patented device cannot quickly find the bevel of the steel pipe end, the bevel can only be determined by screening a large amount of data. Therefore, the workload of the patented device is relatively large. 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 inclination of the end face of a steel pipe based on a pendulum type. The device of the utility model is designed with a symmetrical structure. The use of screws can realize the relative setting of the first bracket and the sixth bracket, and the combined use of the fifth bracket and the screw can realize the relative setting of the third bracket; the combined use of the first bracket and the positioning rod can realize the precise positioning of the steel pipe, and the combined use of the sixth bracket and the first rolling bearing can realize the directional rotation of the rotating shaft; the use of the fourth bracket can realize the linkage of the fifth bracket and the shaft rotation, and the combined use of the third bracket and the second rolling bearing can realize the directional swing of the second bracket; the combined use of the second bracket and the measuring rod can find the inclination of the pipe end, and the combined use of the fifth bracket and the measuring rod can measure the inclination of the pipe end; the combined use of the eight first scale segments of the eight positioning rods and the eight first bosses of the four first brackets can form eight spiral micrometers, and the combined use of the four second scale segments of the four measuring rods, the two fourth bosses of the two second brackets and the two eleventh bosses of the fifth bracket can form four spiral micrometers. 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 inclination of the end face of a steel pipe based on the pendulum type provided by the utility model comprises four first brackets, two second brackets, two third brackets, one fourth bracket, one fifth bracket, two sixth brackets, eight positioning rods, four measuring rods, one rotating shaft, forty screws, two first rolling bearings and four second rolling bearings;

[0010] The first bracket is composed of a first body and four first bosses connected together. The first body is a rectangular parallelepiped symmetrical structure. The four first bosses are arranged opposite to each other in pairs and are respectively located on the upper and lower end surfaces of the first body; the first body is symmetrically provided with two groups of eight cylindrical first through holes, and the screws are penetrated in the first through holes; the first boss is a cylindrical symmetrical structure, and the side surface of the first boss is evenly marked with fifty grid scales along the circumferential direction; a first screw hole is provided at the axis position of the first boss, and the positioning rod is screwed into the first screw hole, and the first screw hole also penetrates the first body;

[0011] The second bracket is composed of a second body, a second boss, a third boss, two fourth bosses and two first bearing sections. The second body, the second boss and the third boss are all rectangular parallelepiped symmetrical structures. The second boss is located at the lower end surface of the second body, the third boss is located at the lower end surface of the second boss, the two fourth bosses are arranged opposite to each other and are respectively located at the left and right end surfaces of the third boss, and the two first bearing sections are respectively located at the left and right end surfaces of the second body; the fourth boss is a cylindrical symmetrical structure, and the side surface of the fourth boss is evenly marked with fifty grid scales along the circumferential direction; a second screw hole is opened at the axis position of the fourth boss, the measuring rod is screwed into the second screw hole, and the second screw hole also runs through the third boss; the first bearing section is a cylindrical symmetrical structure, which is used to penetrate the second rolling bearing;

[0012] The third bracket is composed of a third body and two fifth bosses, the third body and the fifth bosses are both rectangular parallelepiped symmetrical structures, and the two fifth bosses are respectively located on the front and rear end faces of the third body; the third body is symmetrically provided with four cylindrical second through holes, and the screws are penetrated through the second through holes; the left end face of the fifth boss is provided with a cylindrical first groove, and the second rolling bearing is penetrated through the first groove; a cylindrical third through hole is provided at the axial position of the first groove, and the first bearing section of the second bracket is penetrated through the third through hole;

[0013] The fourth bracket is composed of a fourth body and a sixth boss connected coaxially, the fourth body and the sixth boss are both cylindrical symmetrical structures, the sixth boss is located on the left end surface of the fourth body; the right end surface of the fourth body is provided with a second cylindrical groove, the second groove is provided with a clamping section of the rotating shaft; the axis position of the sixth boss is provided with a third screw hole, the third screw hole is screwed with the third threaded section of the rotating shaft, and the third screw hole and the second groove are coaxially connected;

[0014] The fifth bracket is composed of a fifth body, a seventh boss, an eighth boss, a ninth boss, two tenth bosses and four eleventh bosses. The fifth body, the seventh boss, the eighth boss, the ninth boss and the tenth boss are all rectangular parallelepiped symmetrical structures. The seventh boss is located on the lower end surface of the fifth body, the eighth boss is located on the lower end surface of the seventh boss, the ninth boss is located on the upper end surface of the fifth body, the two tenth bosses are respectively located on the lower end surface of the eighth boss and the upper end surface of the ninth boss, and the four eleventh bosses are arranged opposite to each other in pairs. , and are respectively located on the left and right four end faces of the two tenth bosses; a fourth through hole in the shape of a regular octagon is opened in the central part of the fifth body, and the locking section of the rotating shaft is penetrated in the fourth through hole; four fourth screw holes are symmetrically opened on the seventh boss, and the screws are screwed in the fourth screw holes; the eleventh boss is a cylindrical symmetrical structure, and the side surface of the eleventh boss is evenly marked with fifty grid scales along the circumferential direction; a fifth screw hole is opened at the axis position of the eleventh boss, and the measuring rod is screwed in the fifth screw hole, and the fifth screw hole also runs through the tenth boss;

[0015] The sixth bracket is composed of a seventh body, four twelfth bosses and four thirteenth bosses, the seventh body, the twelfth boss and the thirteenth boss are all rectangular parallelepiped symmetrical structures, the four twelfth bosses are respectively located on the upper, lower, front and rear end faces of the seventh body, and the four thirteenth bosses are respectively located on the upper, lower, front and rear end faces of the four twelfth bosses; a cylindrical third groove is provided on the left end face of the seventh body, and the first rolling bearing is penetrated in the third groove; a cylindrical fifth through hole is provided at the axial position of the third groove, and the second bearing section or the third bearing section of the rotating shaft is penetrated in the fifth through hole; four sixth screw holes are symmetrically provided on the thirteenth boss, and the screws are screwed in the sixth screw holes;

[0016] The positioning 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 truncated cone-shaped symmetrical structure, which is used to contact the inner surface of the steel pipe; the first thread section is a cylindrical symmetrical structure with a thread on the side, which is used to screw the first screw hole of the first bracket, and the pitch value of the thread is 0.5mm; 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 0.5mm, and the minimum grid value of the misaligned scales is 1mm;

[0017] The 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 hemispherical symmetrical structure, used to contact the left end face of the steel pipe; the second threaded section is a cylindrical symmetrical structure with a thread on the side, used to screw into the second screw hole of the second bracket or the fifth screw hole of the fifth bracket, and the pitch value of the thread is 0.5mm; the second 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 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.

[0018] In some embodiments, the rotating shaft is composed of a coaxial second bearing segment, a sixth body, a third bearing segment, a locking segment and a third threaded segment. The second bearing segment, the sixth body, the third bearing segment and the third threaded segment are all cylindrical symmetrical structures. The diameters of the second bearing segment and the third bearing segment are equal, and both are smaller than the diameter of the sixth body, but not smaller than the diameter of the circumscribed circle of the locking segment; the locking segment is a regular octagonal symmetrical structure, which is used to penetrate the fourth through hole of the fifth bracket or the second groove of the fourth bracket, and the diameter of the inscribed circle of the locking segment is not smaller than the diameter of the third threaded segment; the outer surface of the third threaded segment is provided with threads, which is used to screw into the third screw hole of the fourth bracket.

[0019] In some embodiments, the screw, the first rolling bearing, and the second rolling bearing are all standard parts.

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

[0021] 1) The device of the utility model includes four first brackets, two second brackets, two third brackets, one fourth bracket, one fifth bracket, two sixth brackets, eight positioning rods, four measuring rods, one rotating shaft, forty screws, two first rolling bearings and four second rolling bearings. 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, initially, the eight positioning rods and the four measuring rods are all rotated to the zero scale position, the four first brackets are inserted into the left port of the steel pipe, the eight positioning rods are respectively rotated out, and the eight first contact sections are respectively in contact with the inner surface of the steel pipe, ensuring that the rotation lengths of the eight positioning rods are equal; the two second brackets are respectively swung to the three-point collinear position for measurement, the four measuring rods are respectively rotated out, and the four second contact sections are respectively in contact with the left end surface of the steel pipe, and △A, △B, △C and △E are read, and according to |△B-△E|'s difference changing trend, choose to rotate the fifth bracket in a small angle along the clockwise direction or counterclockwise direction, swing the two second brackets to the three-point collinear position for measurement, read △B and △E, find the bevel of the end face of the steel pipe based on the condition of △B=△E, read △A and △C measured at this time, measure the outer diameter D, inner diameter d or wall thickness T of the steel pipe respectively, and bring the above measured data into the formula for calculation. Therefore, the operation process 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 screws can realize the relative setting of the first bracket and the sixth bracket, and the combined use of the fifth bracket and the screws can realize the relative setting of the third bracket; the combined use of the first bracket and the positioning rod can realize the precise positioning of the steel pipe, and the combined use of the sixth bracket and the first rolling bearing can realize the directional rotation of the rotating shaft; the use of the fourth bracket can realize the linkage of the fifth bracket and the shaft rotation, and the combined use of the third bracket and the second rolling bearing can realize the directional swing of the second bracket; the combined use of the second bracket and the measuring rod can find the bevel of the pipe end, and the combined use of the fifth bracket and the measuring rod can measure the bevel amount of the pipe end; the combined use of the eight first scale segments of the eight positioning rods and the eight first bosses of the four first brackets can form eight spiral micrometers, and the combined use of the four second scale segments of the four measuring rods, the two fourth bosses of the two second brackets and the two eleventh bosses of the fifth bracket can form four spiral micrometers. Therefore, the use effect of the device of the utility model is relatively good.

[0024] The device for measuring the inclination of the end face of a steel pipe based on the swing type provided by the utility model can not only accurately and stably locate the inner surface of the steel pipe, but also quickly find the inclination of the end face of the pipe, so that the inclination of the end face of the steel pipe can be effectively measured. 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 It is a schematic diagram of the main structure of the device for measuring the inclination of the end face of a steel pipe based on the swing type of the utility model;

[0026] Figure 2 It is a right side structural schematic diagram of the device for measuring the inclination of the end face of a steel pipe based on the swing type of the utility model;

[0027] Figure 3 It is a schematic diagram of the left view of the structure of the device for measuring the inclination of the end face of a steel pipe based on the swing type of the utility model when it is working;

[0028] Figure 4 It is a schematic cross-sectional structure diagram of the device for measuring the inclination of the end face of a steel pipe based on the swing type according to the utility model along the MM plane;

[0029] Figure 5 This is a schematic diagram of the main structure of the first bracket of the utility model;

[0030] Figure 6 It is a schematic diagram of the top view of the structure of the first bracket of the utility model;

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

[0032] Figure 8 This is a schematic diagram of the main structure of the measuring rod of the utility model;

[0033] Fig. 9 This is a schematic diagram of the main structure of the second bracket of the utility model;

[0034] Fig.10 It is a left-side structural schematic diagram of the second bracket of the utility model;

[0035] Fig.11 It is a left-side structural schematic diagram of the third bracket of the utility model;

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

[0037] Fig.13 This is a schematic diagram of the main structure of the fourth bracket of the utility model;

[0038] Fig.14 It is a left-side structural schematic diagram of the fourth bracket of the utility model;

[0039] Fig.15 It is a right side structural schematic diagram of the fourth bracket of the utility model;

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

[0041] Fig.17 It is a left-side structural schematic diagram of the fifth bracket of the utility model;

[0042] Fig.18 This is a schematic diagram of the main structure of the rotating shaft of the utility model;

[0043] Fig.19 This is a schematic diagram of the main structure of the sixth bracket of the utility model;

[0044] Fig. 20 It is a left-side structural schematic diagram of the sixth bracket of the utility model;

[0045] Fig.21 It is a schematic diagram of the setting of the measuring rod of the device for measuring the inclination of the end face of a steel pipe based on the swing type of the utility model when working;

[0046] Fig. 22 It is a plane schematic diagram of the geometric relationship of the device for measuring the inclination of the end face of a steel pipe based on the pendulum type of the utility model;

[0047] Fig.23 It is a schematic diagram of the partial front view structure of the device for measuring the inclination of the end face of a steel pipe based on the swing type of the utility model when it is working;

[0048] Fig.24 It is a schematic diagram of a partial top view of the structure of the device for measuring the inclination of the end face of a steel pipe based on the swing type of the utility model when it is working;

[0049] Fig.25 The utility model is a schematic diagram of the three-dimensional structure of the standard sawing surface of the device for measuring the cutting inclination of the end face of a steel pipe based on the swing type.

[0050] Explanation of the reference numerals: 1-first bracket; 101-first body; 102-first boss; 103-first through hole; 104-first screw hole; 2-positioning rod; 201-first contact section; 202-first threaded section; 203-first scale section; 3-measuring rod; 301-second contact section; 302-second threaded section; 303-second scale section; 4-second bracket; 401-second body; 402-second boss; 403-third boss; 404-fourth boss; 405-first bearing section; 406-second screw hole; 5-third bracket; 501-third body; 502-fifth boss; 503-second through hole; 504-first groove; 505-third through hole; 6-fourth bracket; 601-fourth body; 602-fifth Six bosses; 603-second groove; 604-third screw hole; 7-fifth bracket; 701-fifth body; 702-seventh boss; 703-eighth boss; 704-ninth boss; 705-tenth boss; 706-eleventh boss; 707-fourth through hole; 708-fourth screw hole; 709-fifth screw hole; 8-rotating shaft; 801-second bearing section; 802-sixth body; 803-third bearing section; 804-positioning section; 805-third threaded section; 9-sixth bracket; 901-seventh body; 902-twelfth boss; 903-thirteenth boss; 904-third groove; 905-fifth through hole; 906-sixth screw hole; 10-screw; 11-first rolling bearing; 12-second rolling bearing; 13-steel pipe. DETAILED DESCRIPTION

[0051] 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.

[0052] Combination Figures 1 to 4As shown, the utility model provides a device for measuring the inclination of the end face of a steel pipe based on a pendulum type, which includes four first brackets 1, two second brackets 4, two third brackets 5, a fourth bracket 6, a fifth bracket 7, two sixth brackets 9, eight positioning rods 2, four measuring rods 3, a rotating shaft 8, forty screws 10, two first rolling bearings 11 and four second rolling bearings 12; wherein, two first rolling bearings 11 are inserted into two third grooves 904 of the two oppositely arranged sixth brackets 9, and the second bearing section 801 and the third bearing section 803 of the rotating shaft 8 are inserted into the two first rolling bearings 11 respectively; the clamping section 804 of the rotating shaft 8 is penetrated by the fifth bracket 7, the third threaded section 805 of the rotating shaft 8 is screwed with the fourth bracket 6, and the clamping section 804 of the rotating shaft 8 is penetrated in the second groove 603 of the fourth bracket 6; Two third bodies 501 of two of the third brackets 5 are arranged outside the left and right end faces of the seventh boss 702 of the fifth bracket 7, and are connected by eight of the screws 10; four of the second rolling bearings 12 are passed through the four first grooves 504 of the two third brackets 5, and four first bearing sections 405 of two of the second brackets 4 are respectively passed through the four second rolling bearings 12; four first bodies 101 of four of the first brackets 1 are arranged outside the eight end faces of the eight thirteenth bosses 903 of the two sixth brackets 9, and are connected by thirty-two of the screws 10; eight of the positioning rods 2 are screwed into the eight first screw holes 104 of the four first brackets 1, two of the measuring rods 3 are screwed into the two second screw holes 406 of the two second brackets 4, and two of the measuring rods 3 are screwed into the two fifth screw holes 709 of the fifth bracket 7.

[0053] The assembly process of the device for measuring the inclination of the end face of a steel pipe based on the swing type provided by the utility model

[0054] like Figures 1 to 20 As shown, firstly, two first rolling bearings 11 are installed in the two third grooves 904 of the two sixth brackets 9, and then the two sixth brackets 9 are arranged relative to each other, and then the second bearing segment 801 and the third bearing segment 803 of the rotating shaft 8 are respectively inserted into the two first rolling bearings 11, so that the two sixth brackets 9, the two first rolling bearings 11 and the rotating shaft 8 can be assembled;

[0055] Then, the four first bodies 101 of the four first brackets 1 are simultaneously arranged outside the eight end surfaces of the eight thirteenth bosses 903 of the two sixth brackets 9, and the thirty-two first through holes 103 of the four first brackets 1 and the thirty-two sixth screw holes 906 of the two sixth brackets 9 are aligned, and then the thirty-two screws 10 are passed through the thirty-two first through holes 103 and screwed into the thirty-two sixth screw holes 906, so that the four first brackets 1 and the two sixth brackets 9 can be assembled;

[0056] Then, the locking section 804 of the rotating shaft 8 is inserted into the fourth through hole 707 of the fifth bracket 7, and then the fourth bracket 6 is screwed outside the third threaded section 805 of the rotating shaft 8, and the locking section 804 of the rotating shaft 8 is partially inserted into the second groove 603 of the fourth bracket 6. In this way, the rotating shaft 8, the fourth bracket 6 and the fifth bracket 7 can be assembled;

[0057] Then, two second rolling bearings 12 are installed in the two first grooves 504 of one of the third brackets 5, and then the third body 501 of the third bracket 5 is arranged outside the right end surface of the seventh boss 702 of the fifth bracket 7, and the four second through holes 503 of the third bracket 5 and the four fourth screw holes 708 of the fifth bracket 7 are aligned, and then four screws 10 are passed through the four second through holes 503 and screwed into the four fourth screw holes 708, so that one of the third brackets 5, the two second rolling bearings 12 and the fifth bracket 7 can be assembled;

[0058] Then, the two first bearing sections 405 of the two second brackets 4 are inserted into the two second rolling bearings 12, and then the other two second rolling bearings 12 are installed in the two first grooves 504 of the other third bracket 5, and then the other two first bearing sections 405 of the two second brackets 4 are inserted into the two second rolling bearings 12, so that the other third bracket 5, the other two second rolling bearings 12 and the two second brackets 4 can be assembled;

[0059] At this time, the third body 501 of the other third bracket 5 must be arranged outside the left end surface of the seventh boss 702 of the fifth bracket 7, and the four second through holes 503 of the other third bracket 5 and the four fourth screw holes 708 of the fifth bracket 7 must be aligned, and then the four screws 10 are passed through the four second through holes 503 and screwed into the four fourth screw holes 708, so that the other third bracket 5 and the fifth bracket 7 can be assembled;

[0060] Then, the eight positioning rods 2 are screwed into the eight first screw holes 104 of the four first brackets 1 respectively, and then the two measuring rods 3 are screwed into the two second screw holes 406 of the two second brackets 4 respectively, and finally, the other two measuring rods 3 are screwed into the two fifth screw holes 709 of the fifth bracket 7 respectively. In this way, the whole device is assembled and can be put into use.

[0061] The working principle of the device for measuring the inclination of the end face of a steel pipe based on the swing type provided by the utility model is as follows:

[0062] like Fig.21 As shown, for the convenience of description, the two measuring rods 3 located in the two fifth screw holes 709 of the fifth bracket 7 are respectively set as A and C, and the two measuring rods 3 located in the two second screw holes 406 of the two second brackets 4 are respectively set as E and B; the screwing lengths of A, B, C and E are respectively set as △A, △B, △C and △E, that is, A, B, C and E are respectively screwed into the lengths of △A, △B, △C and △E, then the four measuring rods 3 are all tangent to the left end face of the steel pipe 13; the four tangent points are respectively set as points A, B, C and E, and points A, B, C and E are all located on the middle diameter circle of the steel pipe 13, connecting point A and point C to obtain line segment AC, connecting point B and point E to obtain line segment BE;

[0063] The axis of the rotating shaft 8 is set as axis O, the axes of the two third through holes 505 of the third bracket 5 are set as axis F and axis G respectively, and the axes of the four measuring rods 3 are set as axis A, axis B, axis C and axis E respectively, and a plane schematic diagram with a geometric relationship can be obtained by cutting along the direction perpendicular to the axis of the steel pipe 13, as shown in FIG. Fig. 22 As shown; the steel pipe 13 becomes a ring, the axis O becomes point O, the axis F becomes point F, the axis G becomes point G, the axis A becomes point A, the axis B becomes point B, the axis C becomes point C, and the axis E becomes point E; the line segment OF is the distance from point O to point F, the line segment FB is the distance from point F to point B, and the line segment OB is the distance from point O to point B; the line segment OG is the distance from point O to point G, the line segment GE is the distance from point G to point E, and the line segment OE is the distance from point O to point E;

[0064] In order to simplify the operation, based on the design concept of the shortest second bracket 4, since the two measuring rods 3 are screwed into the two second screw holes 406 of the two second brackets 4, the axis B of B, the axis C of C and the axes of the two second screw holes 406 coincide; when point O, point F and point B are collinear, the length of line segment FB is the shortest, and when point O, point G and point E are collinear, the length of line segment GE is the shortest; proof process: assuming that point H and point K are two symmetrical points on the mid-diameter circle of the steel pipe 13 and deviate from the collinear position of the three points, line segment OH is the distance from point O to point H , line segment OK is the distance from point O to point K; since points B, H, K and E are all located on the median diameter circle of the steel pipe 13, line segment OB = line segment OH = line segment OK = line segment OE; since points O, F and B are collinear, line segment OF + line segment FB = line segment OB; since points O, G and E are collinear, line segment OG + line segment GE = line segment OE; since the straight line between two points is the shortest, line segment OH < line segment OF + line segment FH, line segment OK < line segment OG + line segment GK; after simplification, line segment FB < line segment FH, line segment GE < line segment GK;

[0065] Since the cross section of the cylinder after beveling is an ellipse, the cross section of the middle diameter circle of the steel pipe 13 after beveling is an ellipse. Assuming that the steel pipe 13 is placed in a standard position, that is, point A is the starting tangent point and point C is the final tangent point, the two second brackets 4 are swung to the three-point collinear position respectively, point B and point E are two symmetrical tangent points, and △B=△E; line segment BE is parallel to the minor axis of the ellipse, and B and E are used to find the end face bevel of the steel pipe 13; line segment AC corresponds to the major axis of the ellipse, and A and C are used to measure the end face bevel of the steel pipe 13; in order to simplify the calculation, the outer diameter of the steel pipe 13 is set to D, the inner diameter is set to d, the wall thickness is set to T, and the end face bevel of the steel pipe 13 is set to Q, Q=2×|△A-△C| / (D+d) or Q=|△A-△C| / (DT);

[0066] like Fig.25 As shown, based on the three-dimensional structural schematic diagram of the standard sawing surface, the axis of the steel pipe 13 is set as the x-axis, and the standard sawing surface should be a plane parallel to the y-axis and the z-axis. If the standard sawing surface is rotated only along the y-axis or only along the z-axis, a single-axis beveling will be generated, that is, each sawing surface will only generate one bevel; if the standard sawing surface is rotated along the y-axis and the z-axis at the same time, a double-axis beveling will be generated, that is, each sawing surface will generate two bevels. Since this situation rarely occurs, the utility model only involves single-axis beveling, that is, each end face of the steel pipe 13 has only one bevel; in this case, there are a total of three possible situations for the measurement data, which are discussed and explained below:

[0067] (1) If △B=△E, and △A=△C, this situation is the most ideal, indicating that the steel pipe 13 is placed in a standard position, and also indicating that the end face of the steel pipe 13 does not have a bevel, that is, Q=0;

[0068] (2) If △B=△E, and △A≠△C, this situation is relatively inferior, indicating that the steel pipe 13 adopts a standard placement position, and also indicates that the end face of the steel pipe 13 is cut obliquely, Q=2×|△A-△C| / (D+d) or Q=|△A-△C| / (DT);

[0069] ⑶ If △B≠△E, and △A≠△C, this situation is relatively the worst, indicating that the steel pipe 13 is placed in a non-standard position, and also indicating that the end face of the steel pipe 13 is cut obliquely; first, it is necessary to find the cut oblique surface of the end face; rotate the fifth bracket 7 in the clockwise direction by a smaller angle, and swing the two second brackets 4 to the three-point collinear position respectively. If the difference of |△B-△E| becomes smaller, it means that the rotation direction is correct, and continue to rotate the fifth bracket 7 in the clockwise direction by a smaller angle , swing the two second brackets 4 to the three-point collinear position respectively until △B=△E; if the difference of |△B-△E| becomes larger, it means that the rotation direction is wrong, and the fifth bracket 7 should be rotated a smaller angle in the counterclockwise direction, and the two second brackets 4 are swung to the three-point collinear position respectively until △B=△E; this becomes the situation described in (2), that is, the steel pipe 13 adopts the standard placement position, Q=2×|△A-△C| / (D+d) or Q=|△A-△C| / (DT);

[0070] like Figure 1 As shown, the combined use of the eight first scale segments 203 of the eight positioning rods 2 and the eight first bosses 102 of the four first brackets 1 can form eight screw micrometers, and the measurement accuracy of the eight screw micrometers can reach 0.01mm; reasoning process: since the pitch value of the thread of the positioning rod 2 is 0.5mm, that is, every time the positioning rod 2 rotates one circle, the axial distance moved by the positioning rod 2 in the first screw hole 104 is 0.5mm, and since the side surface of the first boss 102 is evenly marked with fifty grid scales along the circumferential direction, therefore, every time the positioning rod 2 rotates one grid scale, the axial distance moved by the positioning rod 2 in the first screw hole 104 is 0.01mm.

[0071] like Fig.23As shown, the two second scale segments 303 of the two measuring rods 3 and the two eleventh bosses 706 of the fifth bracket 7 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 measuring rod 3 is 0.5mm, that is, the axial distance moved by the measuring rod 3 in the fifth screw hole 709 is 0.5mm for each rotation of the measuring rod 3. Since fifty grid scales are evenly marked on the side surface of the eleventh boss 706 along the circumferential direction, therefore, the axial distance moved by the measuring rod 3 in the fifth screw hole 709 is 0.01mm for each rotation of the measuring rod 3 by one grid scale;

[0072] like Fig.24 As shown, the combined use of the two second scale segments 303 of the two measuring rods 3 and the two fourth bosses 404 of the two second brackets 4 can 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 measuring rod 3 is 0.5mm, that is, every time the measuring rod 3 rotates one circle, the axial distance moved by the measuring rod 3 in the second screw hole 406 is 0.5mm, and since the side surface of the fourth boss 404 is evenly marked with fifty grid scales along the circumferential direction, therefore, every time the measuring rod 3 rotates one grid scale, the axial distance moved by the measuring rod 3 in the second screw hole 406 is 0.01mm.

[0073] The use process of the device for measuring the inclination of the end face of a steel pipe based on the swing type provided by the utility model

[0074] Step 1: Figure 3 and Figure 4 As shown, assuming that the eight positioning rods 2 and the four measuring rods 3 are initially rotated to the zero scale position, firstly, the four first brackets 1 of the device of the utility model are simultaneously inserted into the left port of the steel pipe 13, and then the eight positioning rods 2 are respectively screwed out, and the eight first contact sections 201 of the eight positioning rods 2 are respectively contacted with the inner surface of the steel pipe 13, ensuring that the screwing out lengths of the eight positioning rods 2 are equal, so that the axis of the rotating shaft 8 and the axis of the steel pipe 13 can be ensured to coincide, so as to accurately position the steel pipe 13;

[0075] Step 2: If Figure 21 to Figure 24As shown, the two second brackets 4 are swung to the three-point collinear position for measurement, and then the four measuring rods 3 are rotated out respectively, and the four second contact sections 301 of the four measuring rods 3 are respectively contacted with the left end face of the steel pipe 13, and then △A, △B, △C and △E are read, and then the fifth bracket 7 is rotated at a small angle in the clockwise direction, and then the two second brackets 4 are swung to the three-point collinear position for measurement. If the difference of |△B-△E| becomes smaller, continue to rotate the second bracket 4 at a small angle in the clockwise direction until △B=△E; if the difference of |△B-△E| becomes larger, the fifth bracket 7 should be rotated at a small angle in the counterclockwise direction, and then the two second brackets 4 are swung to the three-point collinear position for measurement, until △B=△E, so that the bevel of the end face can be found;

[0076] Step 3: If Figure 3 and Fig.21 As shown, when △B=△E, that is, the steel pipe 13 adopts the standard placement position, and then read the △A and △C measured at this time respectively, and then measure the outer diameter D of the steel pipe 13, the inner diameter d of the steel pipe 13 or the wall thickness T of the steel pipe 13 respectively, and then substitute the above measured data into the formula Q=2×|△A-△C| / (D+d) or Q=|△A-△C| / (DT), the end face cutting inclination Q of the steel pipe 13 can be calculated.

[0077] Supplementary explanation: The device for measuring the inclination of the end face of a steel pipe based on the pendulum type provided by the utility model is designed with a symmetrical structure. According to the outer diameter specification D and the wall thickness specification T of the steel pipe 13, multiple specifications of the device of the utility model should be designed and manufactured to match it; the length of the line segment FB should be determined based on the condition that points O, F and B are collinear, and the length of the line segment GE should be determined based on the condition that points O, G and E are collinear; the zero scale position refers to the alignment of the initial scale lines of the first scale segment 203 of the positioning rod 2 and the first boss 102 of the first bracket 1, and the second scale segment 303 of the measuring rod 3 and the first boss 102 of the fifth bracket 7. The position when the initial scale lines of the eleven bosses 706 are kept aligned, and the initial scale lines of the second scale segment 303 of the measuring rod 3 and the fourth boss 404 of the second bracket 4 are kept aligned; the smaller angle means that after the fifth bracket 7 is rotated by this angle, the value of (△B-△E) can still change within a monotonic range. It is assumed that △B>△E before rotation, and after the fifth bracket 7 is rotated by this angle, △B>△E can still be ensured; since the first contact segment 201 of the positioning rod 2 is a truncated cone-shaped symmetrical structure, this can ensure that the eight positioning rods 2 and the steel pipe 13 maintain stable four-point contact.

[0078] The device for measuring the inclination of the end face of a steel pipe based on the swing type provided by the utility model can not only accurately and stably locate the inner surface of the steel pipe, but also quickly find the inclination of the end face of the pipe, so that the inclination of the end face of the steel pipe can be effectively measured. The device of the utility model has the characteristics of low manufacturing cost, simple operation and good use effect.

[0079] 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 inclination of the end face of a steel pipe based on a swinging method, characterized in that: The device for measuring the inclination of the end face of a steel pipe based on the pendulum method comprises: four first brackets (1), two second brackets (4), two third brackets (5), one fourth bracket (6), one fifth bracket (7), two sixth brackets (9), eight positioning rods (2), four measuring rods (3), one rotating shaft (8), forty screws (10), two first rolling bearings (11) and four second rolling bearings (12), wherein: The first bracket (1) is composed of a first body (101) and four first bosses (102) connected together. The first body (101) is a symmetrical rectangular parallelepiped structure. The four first bosses (102) are arranged opposite to each other in pairs and are respectively located on the upper and lower end surfaces of the first body (101). The first body (101) is symmetrically provided with two groups of eight cylindrical first through holes (103) in total. The screws (10) are passed through the first through holes (103). The first boss (102) is a symmetrical cylindrical structure. The side surface of the first boss (102) is evenly marked with fifty grid scales along the circumferential direction. A first screw hole (104) is provided at the axial position of the first boss (102). The positioning rod (2) is screwed into the first screw hole (104). The first screw hole (104) also passes through the first body (101). The second bracket (4) is composed of a second body (401), a second boss (402), a third boss (403), two fourth bosses (404) and two first bearing sections (405), the second body (401), the second boss (402) and the third boss (403) are all rectangular parallelepiped symmetrical structures, the second boss (402) is located on the lower end surface of the second body (401), the third boss (403) is located on the lower end surface of the second boss (402), and the two fourth bosses (404) are arranged opposite to each other and are respectively located on the left and right sides of the third boss (403). end faces, the two first bearing sections (405) are respectively located on the left and right end faces of the second body (401); the fourth boss (404) is a cylindrical symmetrical structure, and the side surface of the fourth boss (404) is evenly marked with fifty grid scales along the circumferential direction; a second screw hole (406) is opened at the axial position of the fourth boss (404), the measuring rod (3) is screwed into the second screw hole (406), and the second screw hole (406) also passes through the third boss (403); the first bearing section (405) is a cylindrical symmetrical structure, which is used to pass the second rolling bearing (12); The third bracket (5) is composed of a third body (501) and two fifth bosses (502) connected together. The third body (501) and the fifth bosses (502) are both rectangular parallelepiped symmetrical structures. The two fifth bosses (502) are respectively located on the front and rear end surfaces of the third body (501); the third body (501) is symmetrically provided with four cylindrical second through holes (503), and the screws (10) are inserted into the second through holes (503); the left end surface of the fifth boss (502) is provided with a cylindrical first groove (504), and the second rolling bearing (12) is inserted into the first groove (504); a cylindrical third through hole (505) is provided at the axial position of the first groove (504), and the first bearing section (405) of the second bracket (4) is inserted into the third through hole (505); The fourth bracket (6) is composed of a fourth body (601) and a sixth boss (602) connected coaxially, the fourth body (601) and the sixth boss (602) are both cylindrical symmetrical structures, and the sixth boss (602) is located on the left end surface of the fourth body (601); the right end surface of the fourth body (601) is provided with a second cylindrical groove (603), and the second groove (603) is penetrated by a locking section (804) of the rotating shaft (8); the sixth boss (602) is provided with a third screw hole (604) at the axial position, and the third threaded section (805) of the rotating shaft (8) is screwed into the third screw hole (604), and the third screw hole (604) and the second groove (603) are coaxially connected; The fifth bracket (7) is composed of a fifth body (701), a seventh boss (702), an eighth boss (703), a ninth boss (704), two tenth bosses (705) and four eleventh bosses (706) connected together. The fifth body (701), the seventh boss (702), the eighth boss (703), the ninth boss (704) and the tenth boss (705) are all rectangular parallelepiped symmetrical structures. The seventh boss (702) is located on the lower end surface of the fifth body (701), the eighth boss (703) is located on the lower end surface of the seventh boss (702), the ninth boss (704) is located on the upper end surface of the fifth body (701), the two tenth bosses (705) are respectively located on the lower end surface of the eighth boss (703) and the upper end surface of the ninth boss (704), and the four eleventh bosses (706) are respectively located on the lower end surface of the eighth boss (703) and the upper end surface of the ninth boss (704). The platforms (706) are arranged opposite to each other in pairs and are respectively located on the left and right four end faces of the two tenth bosses (705); a fourth through hole (707) in the shape of a regular octagon is provided at the central part of the fifth body (701), and a locking section (804) of the rotating shaft (8) is penetrated in the fourth through hole (707); four fourth screw holes (708) are symmetrically provided on the seventh boss (702), and the screws (10) are screwed in the fourth screw holes (708); the eleventh boss (706) is a cylindrical symmetrical structure, and fifty grid scales are evenly marked on the side surface of the eleventh boss (706) along the circumferential direction; a fifth screw hole (709) is provided at the axial position of the eleventh boss (706), and the measuring rod (3) is screwed in the fifth screw hole (709), and the fifth screw hole (709) also passes through the tenth boss (705); The sixth bracket (9) is composed of a seventh body (901), four twelfth bosses (902) and four thirteenth bosses (903), the seventh body (901), the twelfth boss (902) and the thirteenth boss (903) are all rectangular parallelepiped symmetrical structures, the four twelfth bosses (902) are respectively located on the upper, lower, front and rear end surfaces of the seventh body (901), and the four thirteenth bosses (903) are respectively located on the upper, lower, front and rear end surfaces of the four twelfth bosses (902); the seventh body A cylindrical third groove (904) is provided on the left end surface of the (901), and the first rolling bearing (11) is inserted into the third groove (904); a cylindrical fifth through hole (905) is provided at the axial position of the third groove (904), and the second bearing section (801) or the third bearing section (803) of the rotating shaft (8) is inserted into the fifth through hole (905); the thirteenth boss (903) is symmetrically provided with four sixth screw holes (906), and the screws (10) are screwed into the sixth screw holes (906); The positioning rod (2) is composed of three parts connected by a coaxial first contact section (201), a first thread section (202) and a first scale section (203). The first contact section (201) is a truncated cone-shaped symmetrical structure, used to contact the inner surface of the steel pipe; the first thread section (202) is a cylindrical symmetrical structure with a thread on the side, used to screw into the first screw hole (104) of the first bracket (1), and the pitch value of the thread is 0.5mm; the first scale section (203) 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 offset scales, the offset value of the two columns of offset scales is 0.5mm, and the minimum grid value of the offset scale is 1mm; The measuring rod (3) is composed of three parts connected by a coaxial second contact section (301), a second threaded section (302) and a second scale section (303). The second contact section (301) is a hemispherical symmetrical structure, used to contact the left end face of the steel pipe; the second threaded section (302) is a cylindrical symmetrical structure with a thread on the side, used to screw into the second screw hole (406) of the second bracket (4) or the fifth screw hole (709) of the fifth bracket (7), and the pitch value of the thread is 0.5mm; the second scale section (303) 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 offset scales, the offset value of the two rows of offset scales is 0.5mm, and the minimum grid value of the offset scale is 1mm.

2. The device for measuring the inclination of the end face of a steel pipe based on the swing type according to claim 1 is characterized in that: The rotating shaft (8) is composed of a coaxial second bearing section (801), a sixth body (802), a third bearing section (803), a locking section (804) and a third threaded section (805), wherein the second bearing section (801), the sixth body (802), the third bearing section (803) and the third threaded section (805) are all cylindrical symmetrical structures, and the diameters of the second bearing section (801) and the third bearing section (803) are equal and smaller than the diameters of the sixth body (80 2), but not less than the diameter of the circumscribed circle of the locking section (804); the locking section (804) is a symmetrical structure in the shape of a regular octagonal prism, and is used to penetrate the fourth through hole (707) of the fifth bracket (7) or the second groove (603) of the fourth bracket (6); the diameter of the inscribed circle of the locking section (804) is not less than the diameter of the third threaded section (805); the outer surface of the third threaded section (805) is provided with threads, and is used to screw into the third screw hole (604) of the fourth bracket (6).

3. The device for measuring the inclination of the end face of a steel pipe based on the swing type according to claim 1 is characterized in that: The screw (10), the first rolling bearing (11) and the second rolling bearing (12) are all standard parts.

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