A local bending measurement device based on vertical swing type steel pipe

Abstract

This utility model discloses a vertical pendulum-based local bending measurement device for steel pipes, belonging to the technical field of auxiliary measurement equipment for steel pipe production. The provided vertical pendulum-based local bending measurement device includes a first support, two second supports, four third supports, a fourth support, four fifth supports, eight sixth supports, three measuring rods, fifty-six bolts, eight rolling bearings, four wheels, and four axles. This device can accurately measure the local bending of steel pipes to guide the pre-straightening of steel pipes by a straightening machine, and features low manufacturing cost, simple operation, and good performance.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary measuring equipment for steel pipe production, specifically relating to a device for measuring the local curvature of steel pipes based on a vertical pendulum. Background Technology

[0002] Currently, during the continuous hot rolling or water quenching and tempering process, steel pipes are inevitably subject to bending along their longitudinal length due to the combined effects of their own weight, rolling stress, and uneven cooling intensity. This is especially true for steel pipes with high Cr and Mo content, where the bending is relatively greater, necessitating a certain degree of straightening. For steel pipes with relatively large bends, if an excessive reduction is applied at once during straightening, the stressed parts of the pipe are easily flattened and develop ellipticity. In view of this, some steel pipe manufacturers cut excessively bent pipes into shorter sections for downgrading, while others have invented pre-straightening devices. These devices effectively avoid applying excessive reduction at once, controlling the bend within the allowable range through multiple step-by-step straightening processes. The function of a local bending measurement device is to accurately measure the local bending degree of the steel pipe and mark the corresponding bending position to guide the straightening machine in its operation.

[0003] After searching, three patent documents were found to be most relevant to this utility model technology. The specific contents are described below:

[0004] Patent document CN 201220362528.X discloses a steel pipe bending degree measuring tool. The tool includes a horizontal ruler, a support, a dial indicator, a slider, and a probe. The tool is exquisitely designed and ingeniously conceived. The support clamps the steel pipe and rotates it to find the bending point at the end of the steel pipe. The dial indicator is adjusted to zero and then slid to the bending point of the steel pipe, which directly displays the bending degree of the steel pipe end. It has the characteristics of simple structure, convenient operation, low manufacturing cost, and high measurement accuracy. Since it is designed for measuring the bending degree of the pipe end, this tool is suitable for measuring the bending degree of the steel pipe end.

[0005] Patent document CN 202023084139.9 discloses a steel pipe bending measurement and marking device. This device includes an ink cartridge, a rope wheel, a laser transmission device, a rope, a support wheel, an adhesive device, a motor, a rotating shaft, a cylinder, a support base, and a central control console. The device is exquisitely designed and ingeniously conceived. The rope uses the ink to mark the protruding bending points of the steel pipe to indicate the bending direction. When a steel pipe with excessive bending rotates, the laser transmission device is interrupted, and the control console is activated to record the information of the out-of-tolerance steel pipe. It features a simple structure, automatic convenience, and accurate identification. This device is suitable for screening steel pipes with excessive bending.

[0006] Patent document CN 202420926719.7 discloses a device for measuring the curvature of a steel pipe along its entire length. The device includes magnetic pads, measuring lines, and a depth gauge. The device is exquisitely designed and ingeniously conceived. The magnetic pads can be adsorbed onto the surface of the steel pipe to be measured, making it easy to install and remove. By adjusting the length of the measuring line between the two magnetic pads, the curvature of steel pipes of different lengths can be measured. It features a simple structure, convenient operation, and high work efficiency. It can also measure the curvature of steel pipes with "S"-shaped bends along their entire length and local curvature. However, since only a depth gauge is used, the measurement accuracy of this device is relatively low. Utility Model Content

[0007] To overcome one or more problems existing in the prior art, this utility model provides a vertical pendulum steel pipe local bending measurement device. This utility model is designed based on a symmetrical structure. The combined use of the first bracket and bolts enables both the left-right relative arrangement of two second brackets and the pairwise relative arrangement of four fifth brackets; the combined use of the fifth bracket and bolts enables the pairwise relative arrangement of eight sixth brackets; the combined use of the sixth bracket and rolling bearings enables the positioning and pendulum rotation of the third bracket; the combined use of two second brackets enables the positioning support of the steel pipe; the combined use of the four third brackets enables the guiding insertion of the steel pipe; the combined use of wheels, axles, and the fourth bracket constitutes a fourth bracket vehicle; the use of the first bracket guides the movement of the four wheels mounted on the fourth bracket; the combined use of the three scale segments of the three measuring rods and the three tenth protrusions of the fourth bracket at its lower position forms three micrometers, thus enabling accurate measurement of the local bending of the steel pipe. Therefore, the device of this utility model has relatively good performance.

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

[0009] The utility model provides a vertical pendulum steel pipe local bending measurement device, which includes a first support, two second supports, four third supports, a fourth support, four fifth supports, eight sixth supports, three measuring rods, fifty-six bolts, eight rolling bearings, four wheels and four axles.

[0010] The first bracket is composed of a first body, sixteen first protrusions, eight second protrusions, and four third protrusions connected together. The first body, first protrusions, second protrusions, and third protrusions are all symmetrical cuboid structures. The sixteen first protrusions are divided into four groups, with each group of first protrusions arranged opposite each other and simultaneously located on the upper surface of the first body. The eight second protrusions are divided into two groups, with each group of second protrusions arranged left-right opposite each other and simultaneously located on the upper surface of the first body. The four third protrusions are divided into two groups, with each group of third protrusions arranged front-back opposite each other and simultaneously located on the upper surface of the first body. The first body has four first protrusions arranged in pairs opposite each other, with a first screw hole in the middle of the upper surface of each first protrusion. A bolt is screwed into the first screw hole, which penetrates the first body. Similarly, the second protrusions in each group are arranged in pairs opposite each other, with a second screw hole in the middle of the upper surface of each second protrusion. A bolt is screwed into the second screw hole, which penetrates the first body.

[0011] The second bracket is composed of a second body, two fourth protrusions, a fifth protrusion, and a sixth protrusion connected together. The second body, the fourth protrusions, the fifth protrusion, and the sixth protrusion are all symmetrical cuboid structures. The two fourth protrusions are arranged opposite each other and are located on the upper end face of the second body. The fifth protrusion is located on the upper end face of both fourth protrusions, and the sixth protrusion is located on the upper end face of the fifth protrusion. The upper end face of the second body has four cylindrical first through holes symmetrically opened, and the bolts are inserted into the first through holes. The upper end face of the sixth protrusion has a semi-cylindrical second through groove, and the steel pipe is inserted into the second through groove.

[0012] The third bracket is composed of a third body, a seventh protrusion, an eighth protrusion, and two bearing segments connected together. The third body, the seventh protrusion, and the eighth protrusion are all symmetrical cuboid structures. The seventh protrusion is located on the front end face of the third body, and the eighth protrusion is located on the front end face of the seventh protrusion. The two bearing segments are arranged opposite each other and are located on the left and right end faces of the third body, respectively. The bearing segments are symmetrical cylindrical structures used to accommodate the rolling bearings.

[0013] The fourth support consists of a fourth body, eight ninth protrusions, and six tenth protrusions connected together. The fourth body is a symmetrical rectangular parallelepiped structure. The eight ninth protrusions are divided into four groups, with each group of nine protrusions arranged opposite each other and located on the lower end face of the fourth body. The six tenth protrusions are divided into two groups, with each group of tenth protrusions arranged opposite each other and located on the upper and lower end faces of the fourth body, respectively. The vertical cross-section of each ninth protrusion is a symmetrical isosceles trapezoidal shape. The two ninth protrusions in each group are arranged opposite each other front to back, and the two ninth protrusions... A third through slot in the shape of an isosceles trapezoid can be formed between them, and the wheel passes through the third through slot; a cylindrical second through hole is opened at the lower part of the rear end face of the ninth boss, and the axle passes through the second through hole; the tenth boss has a cylindrical symmetrical structure, and the three tenth bosses in each group are arranged in a row on the left, center and right, and the circumference of the tenth boss is evenly marked with fifty division scales; a third screw hole is opened at the axis of the tenth boss, and the measuring rod is screwed into the third screw hole, which passes through the fourth body;

[0014] The fifth bracket is composed of a fifth body, two eleventh protrusions, a twelfth protrusion, and two thirteenth protrusions connected together. The fifth body, the eleventh protrusion, the twelfth protrusion, and the thirteenth protrusion are all symmetrical cuboid structures. The two eleventh protrusions are arranged front to back and opposite each other and are located on the upper surface of the fifth body. The twelfth protrusion is located on the upper surface of the two eleventh protrusions. The two thirteenth protrusions are arranged left to right and opposite each other and are located on the upper surface of the twelfth protrusion. The upper surface of the fifth body has four cylindrical third through holes symmetrically opened, and the bolts are inserted into the third through holes. The left end surface of the thirteenth protrusion has four fourth screw holes symmetrically opened, and the bolts are screwed into the fourth screw holes.

[0015] The sixth bracket consists of a sixth body and a fourteenth boss connected together. Both the sixth body and the fourteenth boss are symmetrical rectangular parallelepiped structures. The fourteenth boss is located on the lower end face of the sixth body. A cylindrical groove is formed in the middle of the left end face of the sixth body, and the rolling bearing passes through the groove. A cylindrical fourth through hole is formed on the axis of the groove, and the bearing section of the third bracket passes through the fourth through hole. Four cylindrical fifth through holes are symmetrically formed on the left end face of the fourteenth boss, and the bolts pass through the fifth through holes.

[0016] In some embodiments, the measuring rod is composed of a coaxial scale segment, a threaded segment, and a contact segment connected together. The threaded segment is located on the upper end face of the scale segment, and the contact segment is located on the upper end face of the threaded segment. The scale segment is a cylindrical symmetrical structure, with four sets of scales evenly marked on the circumference of the cylinder. Each set of scales consists of two adjacent left and right staggered columns of scales, with a stagger value of 0.5 mm and a minimum division value of 1 mm. The threaded segment is a cylindrical symmetrical structure with threads on its circumference, used for screwing into the third threaded hole of the fourth bracket, with a thread pitch of 0.5 mm. The contact segment is a frustum-shaped symmetrical structure used for contacting the lower outer surface of the steel pipe.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1) The device for measuring the local curvature of a vertically swinging steel pipe provided by this utility model includes a first support, two second supports, four third supports, a fourth support, four fifth supports, eight sixth supports, three measuring rods, fifty-six bolts, eight rolling bearings, four wheels and four axles. Since the materials are common and easy to process and form, the manufacturing cost of this utility model device is relatively low.

[0019] 2) When using this utility model, initially both groups ① and ② are vertically positioned, and A, B, and C are all at the zero mark position. Four servo motors are driven in the forward direction for a corresponding period of time so that both groups ① and ② can simultaneously rotate 90 degrees in the forward direction at a uniform speed. The steel pipe is passed through the four eighth protrusions and placed in the two second through slots of the two second supports. A, B, and C are screwed in respectively until the three contact sections contact the lower surface of the steel pipe. △A, △B, and △C are read respectively. A, B, and C are screwed out respectively until A, B, and C are all at the zero mark position. Based on the size relationship between △A, △B, and △C and referring to the relevant content of the working principle, the direction of the fourth support vehicle moving horizontally at a uniform speed is determined. During this period, △A, △B, and △C are measured again until △A=△C. △A, △B, and △C are read respectively and substituted into the formula W=△B-△A=△B-△C for calculation. Therefore, the operation of this utility model device is relatively simple.

[0020] 3) This utility model is designed based on a symmetrical structure. The combined use of the first bracket and the bolt can realize the left-right relative setting of the two second brackets and the pairwise relative setting of the four fifth brackets; the combined use of the fifth bracket and the bolt can realize the pairwise relative setting of the eight sixth brackets; the combined use of the sixth bracket and the rolling bearing can realize the positioning and swinging of the third bracket; the combined use of the two second brackets can realize the positioning support of the steel pipe; the combined use of the four third brackets can realize the guiding and insertion of the steel pipe; the combined use of the wheels, axles and the fourth bracket can form a fourth bracket vehicle; the use of the first bracket can guide the movement of the four wheels installed on the fourth bracket; the combined use of the three scale segments of the three measuring rods and the three tenth protrusions of the fourth bracket can form three micrometers, which can accurately measure the local curvature of the steel pipe. Therefore, the device of this utility model has a relatively good effect.

[0021] The local bending of steel pipe based on the vertical pendulum steel pipe measuring device provided by this utility model can accurately measure the local bending of the steel pipe, so as to guide the straightening machine to perform pre-straightening of the steel pipe. The device of this utility model has the characteristics of low manufacturing cost, simple operation and good use effect. Attached Figure Description

[0022] Figure 1 This is a front view schematic diagram of the local bending measurement device for vertically swinging steel pipes of this utility model when the third support is set vertically.

[0023] Figure 2 This is a schematic diagram of the main structure of the vertical pendulum steel pipe local bending measurement device of this utility model when the third support is set horizontally.

[0024] Figure 3 This is a left-view structural diagram of the local bending measurement device for vertically swinging steel pipes of this utility model when the third support is horizontally set.

[0025] Figure 4 This is a top view of the structure of the vertical pendulum steel pipe local bending measurement device of this utility model when the third support is set horizontally.

[0026] Figure 5 This is a schematic diagram of the left-side structure of the first support of this utility model;

[0027] Figure 6 This is a top view of the first support structure of this utility model;

[0028] Figure 7 This is a schematic diagram of the left-side structure of the second support of this utility model;

[0029] Figure 8 This is a top view of the second support structure of this utility model;

[0030] Figure 9 This is a schematic diagram of the left-side structure of the third support of this utility model;

[0031] Figure 10 This is a bottom view of the third support structure of this utility model;

[0032] Figure 11 This is a schematic diagram of the main structure of the fourth bracket and wheel after assembly of this utility model;

[0033] Figure 12 This is a schematic diagram of the left-side structure after the fourth bracket and wheel of this utility model are assembled;

[0034] Figure 13 This is a bottom view of the structure of the fourth bracket and wheel after assembly of this utility model;

[0035] Figure 14 This is a schematic diagram of the front view of the measuring rod of this utility model;

[0036] Figure 15 This is a schematic diagram of the main structure of the fifth bracket of this utility model;

[0037] Figure 16 This is a schematic diagram of the left-side structure of the fifth support of this utility model;

[0038] Figure 17 This is a top view of the fifth support structure of this utility model;

[0039] Figure 18 This is a schematic diagram of the main structure of the sixth bracket of this utility model;

[0040] Figure 19 This is a schematic diagram of the left-side structure of the sixth bracket of this utility model;

[0041] Figure 20 This is a simplified structural diagram of the positive rotational pendulum of the third support of this utility model when it is changed from a vertical setting to a horizontal setting;

[0042] Figure 21 This is a simplified structural diagram of the reverse swinging of the third support of this utility model when it is changed from a horizontal setting to a vertical setting.

[0043] Figure 22 This is a simplified structural diagram showing the numbering of the three measuring rods of this utility model and the distance between the axes of two adjacent measuring rods;

[0044] Figure 23 This is a simplified structural diagram of the measuring rod, designated A, of this utility model when it is in the advance position and the zero-scale position.

[0045] Figure 24 This is a simplified structural diagram of the measuring rod, designated B, of this utility model when it is in the advance position and the zero-scale position.

[0046] Figure 25 This is a simplified structural diagram of the measuring rod, numbered C, of ​​this utility model when it is in the screw-in position and the zero-scale position.

[0047] Figure 26 This is a simplified structural diagram showing the first possible positional relationship between the fourth support, the three measuring rods, and the steel pipe of this utility model.

[0048] Figure 27 This is a simplified structural diagram illustrating the second positional relationship between the fourth support, three measuring rods, and steel pipe of this utility model.

[0049] Figure 28 This is a simplified structural diagram illustrating the third positional relationship between the fourth support, three measuring rods, and steel pipe of this utility model.

[0050] Figure 29 This is a simplified structural diagram illustrating the fourth positional relationship of the fourth support, three measuring rods, and steel pipe in this utility model.

[0051] Figure 30 This is a simplified structural diagram illustrating the fifth positional relationship between the fourth support, three measuring rods, and steel pipe of this utility model.

[0052] Figure 31 This is a simplified structural diagram illustrating the sixth positional relationship between the fourth support, three measuring rods, and steel pipe of this utility model.

[0053] Figure 32 This is a simplified structural diagram illustrating the seventh positional relationship between the fourth support, three measuring rods, and steel pipe of this utility model.

[0054] Figure 33 This is a simplified structural diagram illustrating the eighth positional relationship between the fourth support, three measuring rods, and steel pipe of this utility model.

[0055] Figure 34 This is a simplified structural diagram illustrating the ninth positional relationship between the fourth support, three measuring rods, and steel pipe of this utility model.

[0056] Figure 35 This is a simplified structural diagram illustrating the tenth positional relationship of the fourth support, three measuring rods, and steel pipe of this utility model.

[0057] Figure 36 This is a simplified structural diagram illustrating the eleventh positional relationship between the fourth support, three measuring rods, and steel pipe of this utility model.

[0058] Figure 37This is a simplified structural diagram illustrating the relative positional relationship between the straightening force and the supporting force during local straightening in this utility model.

[0059] Explanation of reference numerals in the attached drawings: 1-First bracket; 101-First body; 102-First boss; 103-Second boss; 104-Third boss; 105-First through slot; 106-First screw hole; 107-Second screw hole; 2-Second bracket; 201-Second body; 202-Fourth boss; 203-Fifth boss; 204-Sixth boss; 205-First through hole; 206-Second through slot; 3-Third bracket; 301-Third body; 302-Seventh boss; 303-Eighth boss; 304-Bearing section; 4-Fourth bracket; 401-Fourth body; 402-Ninth boss; 403 - 10th boss; 404- 3rd through groove; 405- 2nd through hole; 406- 3rd screw hole; 5- Measuring rod; 501- Scale section; 502- Threaded section; 503- Contact section; 6- 5th bracket; 601- 5th body; 602- 11th boss; 603- 12th boss; 604- 13th boss; 605- 3rd through hole; 606- 4th screw hole; 7- 6th bracket; 701- 6th body; 702- 14th boss; 703- Groove; 704- 4th through hole; 705- 5th through hole; 8- Bolt; 9- Rolling bearing; 10- Wheel; 11- Axle; 12- Steel pipe. Detailed Implementation

[0060] The present invention will be described in detail below with reference to the embodiments and accompanying drawings. The embodiments are only for understanding the present invention and are not intended to limit the content of the present invention.

[0061] Combination Figures 1 to 4As shown, this utility model provides a device for measuring the local curvature of a vertically swinging steel pipe, which includes a first support 1, two second supports 2, four third supports 3, a fourth support 4, four fifth supports 6, eight sixth supports 7, three measuring rods 5, fifty-six bolts 8, eight rolling bearings 9, four wheels 10, and four axles 11; wherein, the eight upper end faces of the eight second protrusions 103 of the first support 1 are respectively provided with two opposite second bodies 201 of the two second supports 2, and are connected by the eight bolts 8; the sixteen upper end faces of the sixteen first protrusions 102 of the first support 1 are respectively provided with four opposite fifth bodies 601 of the four fifth supports 6, and are connected by the sixteen bolts 8; the eight thirteenth... Eight fourteenth bosses 702 of the sixth bracket 7 are respectively provided on the eight end faces of the boss 604, and are connected by thirty-two bolts 8; eight rolling bearings 9 are respectively inserted into the eight grooves 703 of the eight sixth brackets 7, and eight bearing sections 304 of the third bracket 3 are respectively inserted into the eight rolling bearings 9; four wheels 10 are simultaneously rolled on the upper end face of the first body 101 of the first bracket 1, and are guided by two first through grooves 105; the four wheels 10 are respectively inserted into the four third through grooves 404 of the fourth bracket 4, and are connected by four axles 11; three measuring rods 5 are screwed into the three third screw holes 406 of the fourth bracket 4.

[0062] The assembly process of the vertical pendulum steel pipe local bending measurement device provided by this utility model

[0063] Combination Figures 1 to 19 As shown, firstly, the first bracket 1 is horizontally set, and then the two second bodies 201 of the two second brackets 2 are simultaneously set on the eight upper surfaces of the eight second protrusions 103 of the first bracket 1. The eight first through holes 205 of the two second brackets 2 and the eight second screw holes 107 of the first bracket 1 are aligned. Then, the eight bolts 8 are passed through the eight first through holes 205 and screwed into the eight second screw holes 107. In this way, the two second brackets 2 and the first bracket 1 can be assembled.

[0064] Then, the four fifth bodies 601 of the four fifth brackets 6 are simultaneously set on the sixteen upper surfaces of the sixteen first protrusions 102 of the first bracket 1, and the sixteen third through holes 605 of the four fifth brackets 6 are aligned with the sixteen first screw holes 106 of the first bracket 1. Then, the sixteen bolts 8 are passed through the sixteen third through holes 605 and screwed into the sixteen first screw holes 106. In this way, the four fifth brackets 6 and the first bracket 1 can be assembled.

[0065] Then, eight rolling bearings 9 are installed in the eight grooves 703 of the eight sixth brackets 7, and the eight sixth brackets 7 are arranged in pairs facing each other. Then, the eight bearing segments 304 of the four third brackets 3 are respectively inserted into the eight rolling bearings 9. In this way, the eight sixth brackets 7, the eight rolling bearings 9 and the four third brackets 3 can be assembled.

[0066] Then, the eight fourteenth protrusions 702 of the eight sixth brackets 7 are respectively fitted onto the left and right eight end faces of the eight thirteenth protrusions 604 of the four fifth brackets 6, and the thirty-two fifth through holes 705 of the eight sixth brackets 7 and the thirty-two fourth screw holes 606 of the four fifth brackets 6 are aligned. Then, the thirty-two bolts 8 are passed through the thirty-two fifth through holes 705 and screwed into the thirty-two fourth screw holes 606. In this way, the eight sixth brackets 7 and the four fifth brackets 6 can be assembled.

[0067] Then, four wheels 10 are inserted into the four third through slots 404 of the fourth bracket 4, and the four axle holes of the four wheels 10 are aligned with the eight second through holes 405 of the fourth bracket 4. Then, four axles 11 are installed in the four sets of aligned through holes. In this way, one fourth bracket 4 and four wheels 10 can be assembled into a fourth bracket vehicle.

[0068] Then, the four wheels 10 installed on the fourth bracket 4 are simultaneously placed on the upper end face of the first body 101 of the first bracket 1, ensuring that the four wheels 10 are simultaneously located within the two first through slots 105 of the first bracket 1. Finally, the three threaded sections 502 of the three measuring rods 5 are screwed into the three third screw holes 406 of the fourth bracket 4. In this way, the entire device is assembled and can be put into use.

[0069] The principle for setting the swing direction of the third support in the vertical swing-type steel pipe local bending measurement device provided by this utility model

[0070] Combination Figure 3As shown in the schematic diagram of the left view structure of this utility model, for ease of description, the two third supports 3 arranged in opposite directions can be regarded as a group. In this way, the four third supports 3 can be divided into two groups. Let the third support 3 in front of each group be defined as ① and the third support 3 in the back be defined as ②. The eight bearing segments 304 of the two groups of third supports 3 can all be used as swing axes, and can all be defined as O.

[0071] Assuming that initially both sets of the third brackets 3 are in a relaxed configuration, that is, all four seventh protrusions 302 are in an upright configuration, the simplified version is as follows: Figure 20 As shown, along the two swing axes O, ① swings 90 degrees clockwise, and ② swings 90 degrees counterclockwise. Then, both sets of the third brackets 3 are in working position, that is, the four seventh protrusions 302 are in horizontal position. We can define the swing directions of ① and ② as positive.

[0072] Assuming that initially both sets of the third brackets 3 are in a working configuration, that is, all four seventh protrusions 302 are horizontally positioned, the simplified configuration is as follows: Figure 21 As shown, along the two swing axes O, ① swings 90 degrees counterclockwise, while ② swings 90 degrees clockwise. Then, both sets of the third supports 3 are in a relaxed setting, that is, the four seventh protrusions 302 are in a vertical setting. We can define the swing directions of ① and ② as opposite.

[0073] To enable both sets of third supports 3 to swing precisely at a 90-degree angle, four couplings, four reducers, and four servo motors can be installed at the outer ends of the four bearing sections 304 on one side of the two sets of third supports 3. Since the encoder can detect the rotor's position, speed, and acceleration in a timely manner and feed this information back to the servo driver, precise control of the servo motors can be achieved. The reducer can convert the relatively high speed of the servo motor into a relatively low speed. Therefore, by driving four servo motors and using four couplings, precise swing of the two sets of third supports 3 can be achieved.

[0074] For ease of description, let's define the direction of rotation of the four servo motors that enables the two sets of ① and ② to swing forward as "positive". Thus, by simultaneously driving the four servo motors in the positive direction, the two sets of ① and ② can simultaneously swing forward at a constant speed. After a certain period of time, the two sets of ① and ② can swing forward by 90 degrees. Similarly, let's define the direction of rotation of the four servo motors that enables the two sets of ① and ② to swing backward as "reverse". Thus, by simultaneously driving the four servo motors in the reverse direction, the two sets of ① and ② can simultaneously swing backward at a constant speed. After a certain period of time, the two sets of ① and ② can swing backward by 90 degrees.

[0075] The working principle of the vertical pendulum steel pipe local bending measurement device provided by this utility model

[0076] Combination Figure 1 and Figure 2 As shown, for ease of description, let's assume the concave surface of the steel pipe 12 faces downwards, and let's define the three measuring rods 5 arranged on the left and right as A, B, and C respectively. Initially, all three measuring rods 5 are at the zero-scale position, as shown. Figure 22 As shown; the three measuring rods 5 are screwed in respectively, and each rod is tangent to the lower surface of the steel pipe 12. Let the screwing lengths of A, B, and C be defined as △A, △B, and △C respectively. Figures 23 to 25 As shown;

[0077] To simplify the measurement, assume that the steel pipe 12 has only one concave arc surface, that is, only one bend point. Let's define this bend point as M. This allows us to divide the steel pipe 12 into the left side of the bend point, the bend point itself, and the right side of the bend point. There is a general rule: the closer the measuring rod 5 is to the bend point, the greater the distance the measuring rod 5 needs to be screwed in; conversely, the farther the measuring rod 5 is from the bend point, the smaller the distance the measuring rod 5 needs to be screwed in. Figures 26 to 36 As shown, there are a total of eleven possible relationships between △A, △B, and △C, which will be discussed and explained below;

[0078] (1) If △A < △B < △C, and C is located to the left of the inflection point, this is the worst-case scenario, indicating that A, B, and C are all located to the left of the inflection point. Figure 26As shown; the fourth support vehicle should be moved slowly and horizontally to the right at a uniform speed along the first through groove 105 of the first support 1. During this process, the values ​​of △A, △B, and △C all increase. When the value of △C begins to decrease, it indicates that C has crossed the inflection point and is located to the right of the inflection point. Continue to move the fourth support vehicle slowly and horizontally to the right at a uniform speed. During this process, the values ​​of △A and △B both increase, and the value of △C decreases until △A = △C. At this time, A, B, and C are all in the standard measurement position, that is, B is located at the inflection point, and the value of △B reaches its maximum. △A, △B, and △C can be read directly.

[0079] (2) If △A < △B < △C, and C is located at the inflection point, the value of △C reaches its maximum. This situation is relatively unfavorable, indicating that both A and B are located to the left of the inflection point. Figure 27 As shown; the fourth support vehicle should be moved slowly and horizontally to the right along the first through groove 105 of the first support 1. During this process, the values ​​of △A and △B are increasing and the value of △C is decreasing until △A=△C. At this time, A, B and C are all in the standard measurement position, that is, B is located at the inflection point and the value of △B reaches the maximum. △A, △B and △C can be read directly.

[0080] (3) If △A < △B < △C, and the distance from B and C to the inflection point is closer than that of B and C, this situation is relatively bad. It indicates that A and B are both located to the left of the inflection point, and C is located to the right of the inflection point. Figure 28 As shown; the fourth support vehicle should be moved slowly and horizontally to the right along the first through groove 105 of the first support 1. During this process, the values ​​of △A and △B are increasing and the value of △C is decreasing until △A=△C. At this time, A, B and C are all in the standard measurement position, that is, B is located at the inflection point and the value of △B reaches the maximum. △A, △B and △C can be read directly.

[0081] (4) If △B = △C, and both are greater than △A, meaning the distances from B and C to the inflection point are equal, this situation is relatively unfavorable. It indicates that A and B are both located to the left of the inflection point, and C is located to the right of the inflection point. Figure 29 As shown; the fourth support vehicle should be moved slowly and horizontally to the right along the first through groove 105 of the first support 1. During this process, the values ​​of △A and △B are increasing and the value of △C is decreasing until △A=△C. At this time, A, B and C are all in the standard measurement position, that is, B is located at the inflection point and the value of △B reaches the maximum. △A, △B and △C can be read directly.

[0082] (5) If △A < △C < △B, and the distance from B and C to the inflection point is greater, this situation is relatively bad. It indicates that A and B are both located to the left of the inflection point, and C is located to the right of the inflection point. Figure 30 As shown; the fourth support vehicle should be moved slowly and horizontally to the right along the first through groove 105 of the first support 1. During this process, the values ​​of △A and △B are increasing and the value of △C is decreasing until △A=△C. At this time, A, B and C are all in the standard measurement position, that is, B is located at the inflection point and the value of △B reaches the maximum. △A, △B and △C can be read directly.

[0083] (6) The most ideal situation is when △A = △C, and both are less than △B. This indicates that A is located to the left of the inflection point, B is exactly located at the inflection point, and C is located to the right of the inflection point. Figure 31 As shown; at this time, A, B and C are all in the standard measurement position, the value of △B reaches the maximum, and △A, △B and △C can be read directly;

[0084] (7) If △B > △A > △C, and B is closer to the inflection point than A and B, this situation is relatively bad. It indicates that A is located to the left of the inflection point, and B and C are both located to the right of the inflection point. Figure 32 As shown; the fourth support vehicle should be moved slowly and horizontally to the left along the first through groove 105 of the first support 1. During this process, the value of △A decreases, while the values ​​of △B and △C increase until △A = △C. At this point, A, B, and C are all in the standard measurement position, that is, B is located at the inflection point, and the value of △B reaches its maximum. △A, △B, and △C can then be read directly.

[0085] (8) If △A = △B, and both are greater than △C, meaning the distances from A and B to the inflection point are equal, this situation is relatively unfavorable. It indicates that A is located to the left of the inflection point, and both B and C are located to the right of the inflection point. Figure 33 As shown; the fourth support vehicle should be moved slowly and horizontally to the left along the first through groove 105 of the first support 1. During this process, the value of △A decreases, while the values ​​of △B and △C increase until △A = △C. At this point, A, B, and C are all in the standard measurement position, that is, B is located at the inflection point, and the value of △B reaches its maximum. △A, △B, and △C can then be read directly.

[0086] (9) If △A>△B>△C, and the distances from A and B to the inflection point are greater than those from A and B, this situation is relatively unfavorable. It indicates that A is located to the left of the inflection point, and both B and C are located to the right of the inflection point. Figure 34 As shown; the fourth support vehicle should be moved slowly and horizontally to the left along the first through groove 105 of the first support 1. During this process, the value of △A decreases, while the values ​​of △B and △C increase until △A = △C. At this point, A, B, and C are all in the standard measurement position, that is, B is located at the inflection point, and the value of △B reaches its maximum. △A, △B, and △C can then be read directly.

[0087] (10) If △A > △B > △C, and A is located at the inflection point, the value of △A reaches its maximum. This situation is relatively unfavorable, indicating that both B and C are located to the right of the inflection point. Figure 35 As shown; the fourth support vehicle should be moved slowly and horizontally to the left along the first through groove 105 of the first support 1. During this process, the value of △A decreases, while the values ​​of △B and △C increase until △A = △C. At this point, A, B, and C are all in the standard measurement position, that is, B is located at the inflection point, and the value of △B reaches its maximum. △A, △B, and △C can then be read directly.

[0088] (11) If △A>△B>△C, and A is located to the right of the inflection point, this is the worst-case scenario, indicating that A, B, and C are all located to the right of the inflection point. Figure 36 As shown; the fourth support vehicle should be moved slowly and horizontally to the left along the first through slot 105 of the first support 1. During this process, the values ​​of △A, △B, and △C all increase. When the value of △A begins to decrease, it indicates that A has crossed the inflection point and is located to the left of the inflection point. Continue to move the fourth support vehicle slowly and horizontally to the left. During this process, the value of △A decreases, while the values ​​of △B and △C increase until △A = △C. At this point, A, B, and C are all in the standard measurement position, that is, B is located at the inflection point, and the value of △B reaches its maximum. △A, △B, and △C can be read directly.

[0089] Let's define the local curvature of the steel pipe 12 as W. When △A=△C, that is, when A, B and C are all in the standard measurement position, B is located at the inflection point, and the value of △B reaches the maximum, we can directly read △A, △B and △C, then W=△B-△A=△B-△C.

[0090] Combination Figure 37As shown, to simplify calculations, the device of this utility model adopts a symmetrical structure design. Let the axial distance between two adjacent measuring rods 5 be defined as d, the straightening force as F, and the supporting force as N. The direction of the straightening force F is always vertically downward, the active force application point is located at the standard measurement position where B is located, and the distance moved is (△B-△A) or (△B-△C). The direction of the supporting force N is always vertically upward, and the passive force application points are located at the standard measurement positions where A and C are located, respectively.

[0091] Combination Figure 1 and Figure 2 As shown, the combined use of the three scale segments 501 of the three measuring rods 5 and the three tenth protrusions 403 of the fourth bracket 4 can form three micrometers, and the measurement accuracy of the three micrometers can reach 0.01mm. Reasoning process: Since the thread pitch of the measuring rod 5 is 0.5mm, that is, for each rotation of the measuring rod 5, the axial distance that the measuring rod 5 moves within the third screw hole 406 is 0.5mm. Since the circumferential surface of the tenth protrusion 403 is evenly marked with fifty divisions, therefore, for each division that the measuring rod 5 rotates, the axial distance that the measuring rod 5 moves within the third screw hole 406 is 0.01mm.

[0092] The method of using the vertical pendulum steel pipe local bending measurement device provided by this utility model

[0093] Assuming that initially both sets of ① and ② are vertically positioned, meaning that the four seventh protrusions 302 of both sets of ① and ② are vertically positioned, and that A, B, and C are all at the zero-scale position, such as Figure 1As shown; then, the four servo motors are driven in the forward direction for a corresponding period of time so that the two sets of ① and ② can simultaneously rotate 90 degrees in the forward direction at a uniform speed. At this time, the four seventh protrusions 302 are all horizontally set; then, the steel pipe 12 passes through the four eighth protrusions 303 and is set in the two second through slots 206 of the two second supports 2, ensuring that the concave arc surface of the steel pipe 12 is set vertically downward; then, A, B and C are screwed in respectively until the three contact segments 503 contact the lower surface of the steel pipe 12 respectively, and then △A and △B are read respectively. And △C; then rotate A, B, and C respectively until A, B, and C are all at the zero mark position. Then, based on the size relationship between △A, △B, and △C, and referring to the relevant content of the working principle, decide whether to move the fourth support vehicle horizontally to the left or horizontally to the right at a constant speed. During this period, measure △A, △B, and △C again until △A = △C. At this time, A, B, and C are all at the standard measurement position. Read △A, △B, and △C respectively, and then substitute them into the formula W = △B - △A = △B - △C for calculation. Figures 2 to 4 As shown.

[0094] Supplementary Explanation: The vertical pendulum steel pipe local bending measurement device provided by this utility model adopts a symmetrical structure design. A device of corresponding specifications should be designed and manufactured to match the outer diameter, fixed length, and installation height of the steel pipe. The zero-scale position refers to the position where the scale segment of the measuring rod and the initial scale line of the tenth protrusion at the lower position of the fourth support are aligned. The inner diameter of the second through groove of the second support should be equal to the outer diameter of the steel pipe, that is, when the concave arc surface of the steel pipe is facing downwards, it can effectively ensure that the second through groove can perfectly fit the steel pipe. When both sets ① and ② are horizontally arranged... The distance between the two opposing eighth protrusions should be equal to the outer diameter of the steel pipe to ensure proper insertion with the concave arc surface of the steel pipe facing downwards. The corresponding time period refers to the time it takes for the third support to swing 90 degrees. Since a coupling, a reducer, and a servo motor are installed on the bearing section of one side of the third support, the reducer converts the relatively high speed of the servo motor into a relatively low speed. Therefore, the servo motor needs to be continuously driven for a period of time so that the third support can swing 90 degrees. Because the contact section of the measuring rod adopts a frustum-shaped structure, even if there is a certain degree of deviation in the placement of the concave arc surface of the steel pipe... This also ensures that the contact section and the steel pipe remain tangent. Of course, this deviation should generally be very small, and the area of ​​the upper surface of the frustum should also be very small to avoid affecting the measurement results. Before moving the fourth support vehicle horizontally at a constant speed, A, B, and C should be rotated out respectively until they are all at the zero mark position to avoid A, B, and C hitting the steel pipe during the movement of the fourth support vehicle. If △A, △B, and △C all change within the same monotonic interval, that is, A, B, and C are simultaneously located to the left of the inflection point or simultaneously located to the right of the inflection point... For measurement where △A, △B, and △C do not change within the same monotonic range (i.e., A, B, and C are located to the left and right of the inflection point, respectively), the movement distance of the fourth support vehicle can be appropriately reduced (i.e., fine-tuning the positioning measurement). When △A = △C, meaning A, B, and C are all in the standard measurement position, pigment should be evenly applied to the upper surfaces of A, B, and C to mark the local bends of the steel pipe, thus guiding the straightening machine to pre-straighten the steel pipe.

[0095] As can be seen from the embodiments, the local bending of the steel pipe based on the vertical swing type steel pipe measuring device provided by this utility model can accurately measure the local bending of the steel pipe, so as to guide the straightening machine to perform pre-straightening of the steel pipe. The device of this utility model has the characteristics of low manufacturing cost, simple operation and good use effect.

[0096] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features.

Claims

1. A device for measuring the local bending degree of a vertically pendulum steel pipe, characterized in that, The vertical swing-type steel pipe local bending measurement device includes: one first support (1), two second supports (2), four third supports (3), one fourth support (4), four fifth supports (6), eight sixth supports (7), three measuring rods (5), fifty-six bolts (8), eight rolling bearings (9), four wheels (10), and four axles (11), wherein: The first bracket (1) is composed of a first body (101), sixteen first protrusions (102), eight second protrusions (103), and four third protrusions (104). The first body (101), the first protrusions (102), the second protrusions (103), and the third protrusions (104) are all rectangular parallelepiped symmetrical structures. The sixteen first protrusions (102) are divided into four groups, with each group of first protrusions (102) arranged opposite each other and simultaneously located on the upper surface of the first body (101). The eight second protrusions (103) are divided into two groups, with each group of second protrusions (103) arranged opposite each other left and right and simultaneously located on the upper surface of the first body (101). The four third protrusions (104) are divided into two groups, with each group of third protrusions (104) arranged opposite each other front and back and simultaneously located on the upper surface of the first body (101). The two third protrusions (104) in each group are arranged opposite each other, and a cuboid first through groove (105) can be formed between the two third protrusions (104). The first through groove (105) is used to guide the wheel (10). The four first protrusions (102) in each group are arranged opposite each other. A first screw hole (106) is opened in the middle part of the upper end face of the first protrusion (102). The bolt (8) is screwed into the first screw hole (106). The first screw hole (106) passes through the first body (101). The four second protrusions (103) in each group are arranged opposite each other. A second screw hole (107) is opened in the middle part of the upper end face of the second protrusion (103). The bolt (8) is screwed into the second screw hole (107). The second screw hole (107) passes through the first body (101). The second bracket (2) is composed of a second body (201), two fourth protrusions (202), a fifth protrusion (203), and a sixth protrusion (204). The second body (201), the fourth protrusions (202), the fifth protrusion (203), and the sixth protrusion (204) are all symmetrical rectangular structures. The two fourth protrusions (202) are arranged opposite each other and are located on the upper surface of the second body (201). The fifth protrusion (203) 203) is located on the upper surface of the two fourth protrusions (202), and the sixth protrusion (204) is located on the upper surface of the fifth protrusion (203); the upper surface of the second body (201) is symmetrically provided with four cylindrical first through holes (205), and the bolts (8) are inserted in the first through holes (205); the upper surface of the sixth protrusion (204) is provided with a semi-cylindrical second through groove (206), and the steel pipe is inserted in the second through groove (206); The third support (3) is composed of a third body (301), a seventh boss (302), an eighth boss (303), and two bearing segments (304). The third body (301), the seventh boss (302), and the eighth boss (303) are all symmetrical cuboid structures. The seventh boss (302) is located on the front end face of the third body (301), and the eighth boss (303) is located on the front end face of the seventh boss (302). The two bearing segments (304) are arranged opposite each other and are located on the left and right end faces of the third body (301), respectively. The bearing segments (304) are symmetrical cylindrical structures used to pass through the rolling bearing (9). The fourth support (4) is composed of a fourth body (401), eight ninth protrusions (402), and six tenth protrusions (403). The fourth body (401) is a symmetrical rectangular parallelepiped structure. The eight ninth protrusions (402) are divided into four groups, with each group of nine protrusions (402) arranged opposite each other and located on the lower end face of the fourth body (401). The six tenth protrusions (403) are divided into two groups, with each group of tenth protrusions (403) arranged opposite each other vertically and located on the upper and lower end faces of the fourth body (401). The vertical cross-section of each ninth protrusion (402) is a symmetrical isosceles trapezoid shape. The two ninth protrusions (402) in each group are arranged opposite each other front to back, and the two ninth protrusions (402) can be separated by a vertical cross-section. A third through slot (404) is formed in the shape of an isosceles trapezoid, and the wheel (10) passes through the third through slot (404); a cylindrical second through hole (405) is opened at the lower part of the rear end face of the ninth boss (402), and the axle (11) passes through the second through hole (405); the tenth boss (403) is a cylindrical symmetrical structure, and the three tenth bosses (403) in each group are arranged in a row on the left, center and right, and fifty division scales are evenly marked on the circumference of the tenth boss (403); a third screw hole (406) is opened at the axis of the tenth boss (403), and the measuring rod (5) is screwed into the third screw hole (406), and the third screw hole (406) passes through the fourth body (401). The fifth support (6) is composed of a fifth body (601), two eleventh protrusions (602), a twelfth protrusion (603), and two thirteenth protrusions (604). The fifth body (601), the eleventh protrusion (602), the twelfth protrusion (603), and the thirteenth protrusion (604) are all symmetrical rectangular structures. The two eleventh protrusions (602) are arranged opposite each other and are located on the upper surface of the fifth body (601). The twelfth protrusion (603) is located on the upper surface of the fifth body (601). The two eleventh protrusions (602) are located on the upper surfaces of the two thirteenth protrusions (604), which are arranged opposite each other and are located on the upper surfaces of the twelfth protrusion (603). The upper surface of the fifth body (601) is symmetrically provided with four cylindrical third through holes (605), and the bolts (8) are inserted into the third through holes (605). The left end surface of the thirteenth protrusion (604) is symmetrically provided with four fourth screw holes (606), and the bolts (8) are screwed into the fourth screw holes (606). The sixth bracket (7) is composed of a sixth body (701) and a fourteenth boss (702). The sixth body (701) and the fourteenth boss (702) are both rectangular parallelepiped symmetrical structures. The fourteenth boss (702) is located on the lower end face of the sixth body (701). A cylindrical groove (703) is opened in the middle part of the left end face of the sixth body (701). The rolling bearing (9) is inserted in the groove (703). A cylindrical fourth through hole (704) is opened in the axial part of the groove (703). The bearing section (304) of the third bracket (3) is inserted in the fourth through hole (704). Four cylindrical fifth through holes (705) are symmetrically opened on the left end face of the fourteenth boss (702). The bolt (8) is inserted in the fifth through hole (705).

2. The device for measuring the local curvature of a vertically pendulum steel pipe according to claim 1, characterized in that, The measuring rod (5) is composed of a coaxial scale section (501), a threaded section (502), and a contact section (503). The threaded section (502) is located on the upper end face of the scale section (501), and the contact section (503) is located on the upper end face of the threaded section (502). The scale section (501) is a cylindrical symmetrical structure. The circumferential surface of the cylinder is uniformly marked with four sets of scales. Each set of scales consists of two adjacent left and right columns of staggered scales. The stagger value of the two columns of staggered scales is 0.5mm, and the minimum division value of the staggered scales is 1mm. The threaded section (502) is a cylindrical symmetrical structure with threads on its circumferential surface. It is used to screw the third screw hole (406) of the fourth bracket (4). The thread pitch is 0.5mm. The contact section (503) is a frustum-shaped symmetrical structure. It is used to contact the lower outer surface of the steel pipe.

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