Steel pipe machining precision calibration device and calibration method

Abstract

The invention discloses a steel pipe machining precision calibration device and method, and relates to the technical field of steel pipe machining. The device comprises a base, an inner clamping assembly, an outer clamping assembly, a calibration assembly, a straightening assembly and an assembly used for automatic control; a mounting frame is slidably arranged on the base, the inner clamping assembly drives a moving block through an air cylinder, and self-adaptive clamping of the inner wall of the steel pipe is achieved by combining an inclined sliding groove and an inner clamping spring; the outer clamping assembly is matched with an outer clamping spring through a clamping motor, so that the outer wall of the steel pipe is stably clamped; the calibration assembly can adjust the distance between calibration rings in a self-adaptive mode through a bidirectional lead screw and a transmission structure; the straightening assembly accurately controls the straightening position and pressure through an electric sliding table and an electric lifting rod. The automatic control assembly comprises a control unit, a data acquisition unit and a driving unit, accurate regulation and control of clamping force, calibration size and straightening pressure are achieved through closed-loop control logic, and machining data can be stored to facilitate tracing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel pipe processing, in particular to a steel pipe processing precision calibration device and method. BACKGROUND

[0002] Steel pipe is a steel material with a hollow section, and its length is much greater than its diameter or circumference. According to the cross-sectional shape, it is divided into round, square, rectangular and special-shaped steel pipes. Steel pipe is not only used for conveying fluid and powder solid, exchanging heat energy, and manufacturing mechanical parts and containers, but also is an economical steel material. Using steel pipe to manufacture building structure net rack, support and mechanical support can reduce weight, save metal by 20-40%, and realize factory mechanized construction. Using steel pipe to manufacture highway bridges can not only save steel, simplify construction, but also greatly reduce the area of protective coating, save investment and maintenance cost.

[0003] In order to ensure the good and stable performance of the steel pipe, it needs to be processed, but the stability of the device for clamping the object to be processed is difficult to guarantee, and the flexibility and adaptability of the device are certain lack. When it is necessary to meet the needs of different sizes, it is more troublesome, which is not conducive to the relevant work. SUMMARY

[0004] The present application aims to at least solve one of the above technical problems in the technical field.

[0005] To achieve the above purpose, the present application provides a steel pipe processing precision calibration device, which comprises a base, an inner clamping assembly, an outer clamping assembly, a calibration assembly, a straightening assembly and a component for automatic control.

[0006] The component for automatic control is electrically connected with the inner clamping assembly, the outer clamping assembly, the calibration assembly and the straightening assembly respectively, for coordinated control of the clamping action of the inner clamping assembly, the limiting and clamping action of the outer clamping assembly, the size adjustment action of the calibration assembly, the straightening position and pressure adjustment action of the straightening assembly, and the sliding action of the mounting bracket on the base, to realize precise control of the steel pipe clamping, calibration and straightening process.

[0007] As an improvement, the component for automatic control comprises a control unit, a data acquisition unit and a driving unit.

[0008] The data acquisition unit is electrically connected with the signal input end of the control unit, for acquiring the steel pipe clamping state, calibration size, straightening pressure and mounting bracket displacement data.

[0009] The driving unit is electrically connected with the signal output end of the control unit and the execution elements of the inner clamping assembly, the outer clamping assembly, the calibration assembly and the straightening assembly respectively, for receiving the instructions of the control unit and driving the corresponding execution elements to act.

[0010] As an improvement, the data acquisition unit comprises:

[0011] The pressure acquisition unit is respectively arranged on the inner side of the inner clamping plate of the inner clamping assembly, the inner side of the outer clamping plate of the outer clamping assembly and the bottom of the straightening plate of the straightening assembly, and is used for acquiring the inner clamping force, the outer clamping force and the straightening contact pressure.

[0012] The displacement acquisition unit is arranged beside the sliding rod of the base and beside the limiting rod of the straightening assembly, and is used for acquiring the sliding displacement of the mounting frame and the moving displacement of the electric sliding table.

[0013] The size acquisition unit is arranged between the upper calibration ring and the lower calibration ring of the calibration assembly, and is used for acquiring the outer diameter size of the steel pipe to be processed.

[0014] As an improvement, the driving unit comprises a plurality of sub-driving units, which are respectively used for controlling:

[0015] The cylinder of the inner clamping assembly, the extension amount of the cylinder is adjusted to control the clamping stroke of the inner clamping plate;

[0016] The clamping motor of the outer clamping assembly, the rotating speed and direction of the clamping motor are adjusted to control the clamping tightness of the limiting clamp;

[0017] The driving motor of the calibration assembly, the rotating speed and direction of the driving motor are adjusted to control the distance between the upper calibration ring and the lower calibration ring;

[0018] The electric sliding table and the electric lifting rod of the straightening assembly, the moving speed of the electric sliding table and the extension amount of the electric lifting rod are respectively adjusted;

[0019] The electric telescopic rod of the base, the extension speed of the electric telescopic rod is adjusted to control the sliding speed of the mounting frame.

[0020] As an improvement, the control unit is provided with a clamping force closed-loop control logic: when the inner clamping force or the outer clamping force acquired by the pressure acquisition unit is less than a preset threshold value, the control unit increases the extension amount of the cylinder or the output torque of the clamping motor through the driving unit; when the clamping force is greater than the preset threshold value, the output of the corresponding executing element is reduced to avoid damaging the steel pipe or over-clamping.

[0021] As an improvement, the control unit is provided with a calibration size self-adaptive adjustment logic: after the size acquisition unit acquires the outer diameter size of the steel pipe to be processed, the control unit calculates the target distance between the upper calibration ring and the lower calibration ring according to the size, and controls the driving motor to rotate through the driving unit, so as to drive the bidirectional screw rod to adjust the upper calibration ring and the lower calibration ring to the target distance, without manual adjustment.

[0022] As an improvement, the control unit is built-in straightening pressure feedback control logic: during the straightening process, the pressure collecting piece at the bottom of the straightening plate feeds back the contact pressure in real time, and the control unit adjusts the extension amount of the electric lifting rod through the driving unit according to the preset straightening pressure threshold, so that the straightening pressure is stabilized within the threshold range, the straightening accuracy is ensured, and the steel pipe deformation is avoided.

[0023] As an improvement, the component for automatic control further comprises an interaction unit electrically connected with the control unit, for:

[0024] inputting parameters such as steel pipe specifications, target clamping force, straightening pressure, etc.;

[0025] displaying state data such as real-time clamping force, calibration size, straightening pressure, mounting frame displacement, etc.;

[0026] providing a manual / automatic mode switching function, which can directly control the action of each execution element in manual mode.

[0027] As an improvement, the component for automatic control further comprises a storage unit electrically connected with the control unit, for storing parameters such as steel pipe specifications, clamping force, calibration size, straightening pressure and processing time of each steel pipe processing, facilitating subsequent traceability and process optimization.

[0028] A steel pipe processing precision calibration method, comprising the following steps:

[0029] S1, input the specification parameters of the steel pipe to be processed through the interaction unit, and the control unit calculates the target distance of the calibration assembly according to the specification parameters, drives the driving motor to adjust the upper and lower calibration rings to the target distance, and passes the steel pipe through the calibration rings;

[0030] S2, the control unit starts the air cylinder of the inner clamping assembly and the clamping motor of the outer clamping assembly through the driving unit, and collects clamping force data from the pressure collecting piece, and adjusts to the target clamping force in a closed loop, to complete the synchronous clamping of the inner and outer walls of the steel pipe;

[0031] S3, the control unit drives the electric telescopic rod to drive the mounting frame to slide, so that the steel pipe moves along the calibration assembly, the size collecting piece detects the outer diameter of the steel pipe in real time, and if there is deviation, the control unit fine-tunes the distance between the calibration rings, to complete the preliminary calibration;

[0032] S4, the control unit drives the electric sliding table to move to the straightening position, controls the electric lifting rod to drive the straightening plate to descend, adjusts the straightening pressure in combination with the feedback of the pressure collecting piece, and completes the straightening of the steel pipe;

[0033] S5, after the processing is completed, the storage unit automatically saves the processing data, and the control unit controls each component to reset and remove the steel pipe.

[0034] According to the steel pipe machining precision calibration device and calibration method, the inner clamping assembly and the outer clamping assembly can clamp the steel pipe from the inner wall and the outer wall simultaneously, the stability in the related working process is ensured, the inner clamping assembly and the outer clamping assembly can clamp the steel pipe in a self-adaptive mode, the flexibility and adaptability of the device are ensured, and finally, the calibration assembly and the straightening assembly are cooperated, so that the related work can be conveniently and quickly carried out.

[0035] Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0036] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0037] Figure 1 is a structural schematic view of a steel pipe machining precision calibration device and calibration method according to one embodiment of the present application;

[0038] Figure 2 is a structural schematic view of a steel pipe machining precision calibration device and calibration method according to another embodiment of the present application;

[0039] Figure 3 is a structural schematic view of a calibration assembly of a steel pipe machining precision calibration device and calibration method according to one embodiment of the present application;

[0040] Figure 4 is a structural schematic view of an outer clamping assembly of a steel pipe machining precision calibration device and calibration method according to one embodiment of the present application;

[0041] Figure 5 is a structural schematic view of an inner clamping assembly of a steel pipe machining precision calibration device and calibration method according to one embodiment of the present application;

[0042] Figure 6 is a structural schematic view of an inner clamping assembly of a steel pipe machining precision calibration device and calibration method according to one embodiment of the present application;

[0043] Figure 7 is an enlarged view of A of a steel pipe machining precision calibration device and calibration method according to one embodiment of the present application;

[0044] Figure 8 is a system control view of a steel pipe machining precision calibration device and calibration method according to one embodiment of the present application.

[0045] As shown in the drawings:

[0046] 1, base; 11, mounting frame; 12, sliding rod; 13, electric telescopic rod; 2, inner clamping assembly; 21, limiting frame; 22, moving block; 221, inclined chute; 23, air cylinder; 24, inner fixing structure; 241, moving shaft; 242, moving plate; 243, inner clamping spring; 244, inner clamping plate; 3, outer clamping assembly; 31, limiting structure; 311, limiting frame; 312, limiting block; 313, limiting clamp; 314, clamping motor; 315, clamping lead screw; 316, clamping sliding block; 317, transmission rod; 32, outer fixing structure; 321, outer clamping plate; 3211, protruding part; 322, outer clamping spring; 323, support rod; 4, calibration assembly; 41, bidirectional lead screw; 411, extension end; 42, drive motor; 43, upper calibration ring; 44, lower calibration ring; 45, transmission structure; 451, driving wheel; 452, driven wheel; 453, transmission belt; 5, straightening assembly; 51, moving groove; 52, limiting rod; 53, electric sliding table; 54, electric lifting rod; 55, straightening plate. DETAILED DESCRIPTION

[0047] Embodiments of the present application are described in detail below with reference to examples thereof illustrated in the attached drawings, wherein the same or similar reference numerals are used throughout the drawings and the same or similar functions and structures are represented by the same or similar reference numerals throughout the drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0048] A steel pipe machining precision calibration device and a calibration method are described below in conjunction with the drawings.

[0049] The steel pipe machining precision calibration device comprises a base 1, an inner clamping assembly 2, an outer clamping assembly 3, a calibration assembly 4, a straightening assembly 5, and an assembly for automatic control, and the structures and connection relationships of the assemblies are as follows:

[0050] (I) Base 1

[0051] The base 1 is a support base of the device, and a mounting frame 11 is slidably arranged thereon, and a sliding rod 12 and an electric telescopic rod 13 are fixedly installed thereon. The mounting frame 11 is slidably sleeved on the sliding rod 12 and can move axially along the sliding rod 12 stably; the two ends of the electric telescopic rod 13 are fixedly connected with the mounting frame 11 and the base 1 respectively, and are used to drive the sliding of the mounting frame 11, thereby driving the synchronous movement of the inner clamping assembly 2 and the outer clamping assembly 3 mounted on the mounting frame 11.

[0052] (II) Inner clamping assembly 2

[0053] The inner clamping assembly 2 is installed on the mounting frame 11 and is used for clamping and fixing from the inner wall of the steel pipe, and comprises a limiting frame 21, a moving block 22, an air cylinder 23, and an inner fixing structure 24.

[0054] Limiting frame 21: It has a rectangular frame structure and is fixedly installed on the top of the mounting bracket 11 to provide sliding guidance for the moving block 22.

[0055] Moving block 22: It is slidably disposed inside the limiting frame 21, and its side is provided with an inclined groove 221. The inclined direction of the inclined groove 221 forms a certain angle with the sliding direction of the moving block 22, and is used to drive the lifting and lowering of the internal fixed structure 24 by sliding.

[0056] Cylinder 23: Installed on the back of mounting bracket 11, its drive end passes through mounting bracket 11 and is fixedly connected to one end of moving block 22, which can push moving block 22 to slide horizontally within limit frame 21.

[0057] The internal fixing structure 24 is arranged in a mirror image, one above the other, on both sides of the movable block 22. Each set of internal fixing structures 24 includes a movable shaft 241, a movable plate 242, an internal clamping spring 243, and an internal clamping plate 244. The bottom of the movable shaft 241 is slidably embedded in the inclined groove 221, and the top extends upward through the limiting frame 21 and is fixedly connected to the movable plate 242. The top of the movable plate 242 is equipped with the internal clamping spring 243, and the top of the internal clamping spring 243 is connected to the internal clamping plate 244. The internal clamping plate 244 is arc-shaped, which matches the curvature of the inner wall of the steel pipe. The internal clamping spring 243 can adapt to the inner wall size of the steel pipe through elastic deformation to ensure tight clamping.

[0058] (III) External clamping assembly 3

[0059] The outer clamping assembly 3 is disposed outside the inner clamping assembly 2 and is used for clamping and limiting the steel pipe from the outer wall. It includes a limiting structure 31 and an outer fixing structure 32.

[0060] Limiting structure 31: It is set in a mirror image on the left and right sides of the inner clamping assembly 2. Each set of limiting structure 31 includes a limiting frame 311, a limiting block 312, a limiting clamp 313, a clamping motor 314, a clamping screw 315, a clamping slider 316, and a transmission rod 317. The limiting frame 311 is fixedly installed on the mounting frame 11, and the limiting block 312 is slidably disposed inside the limiting frame 311; the limiting clamp 313 is fixed on the side of the limiting block 312 near the inner clamping assembly 2, and is used to clamp the outer fixing structure 32; the clamping motor 314 is installed at one end of the limiting frame 311, and its output end is fixedly connected to one end of the clamping screw 315; the clamping screw 315 is rotatably installed inside the limiting frame 311, and the clamping slider 316 is threaded onto the clamping screw 315; the two ends of the transmission rod 317 pass through the limiting block 312 and the clamping slider 316 respectively, and can drive the limiting block 312 to move synchronously with the sliding of the clamping slider 316, thereby adjusting the position of the limiting clamp 313.

[0061] The outer fixing structure 32 is symmetrically arranged on the upper and lower sides of the inner clamping assembly 2, each set of outer fixing structure 32 includes an outer clamping plate 321, an outer clamping spring 322 and a support rod 323. The outer clamping plate 321 is arc-shaped and matched with the outer wall of the steel pipe, and a protrusion 3211 is arranged on the outer side of the outer clamping plate 321 for cooperation with the limiting clamp 313 to realize clamping; the two ends of the support rod 323 are fixedly connected with the outer clamping plate 321 and the mounting frame 11 respectively, and the outer clamping spring 322 is sleeved on the outer side of the support rod 323, and the two ends are also connected with the outer clamping plate 321 and the mounting frame 11. The outer clamping spring 322 can be automatically adapted to the size of the outer wall of the steel pipe through elastic contraction, so as to ensure that the outer clamping plate 321 is tightly attached to the outer wall of the steel pipe.

[0062] (IV) Calibration assembly 4

[0063] The calibration assembly 4 is installed on one side of the base 1 and is used for preliminary size calibration of the steel pipe, and includes a bidirectional screw 41, a driving motor 42, an upper calibration ring 43, a lower calibration ring 44 and a transmission structure 45.

[0064] The bidirectional screw 41 is two in number and is arranged in parallel on the bracket on one side of the base 1, and one end of each bidirectional screw 41 extends downward to form an extension end 411, and the extension end 411 extends downward after penetrating through the base 1.

[0065] The driving motor 42 is fixedly installed on the bottom of the base 1, and the output end thereof is fixedly connected with the extension end 411 of one of the bidirectional screws 41 to provide power for the rotation of the bidirectional screw 41.

[0066] The upper calibration ring 43 and the lower calibration ring 44 are both semicircular and symmetrically arranged and are sleeved on the two bidirectional screws 41 through threads. When the bidirectional screw 41 rotates, the upper calibration ring 43 and the lower calibration ring 44 can be driven to move along the axial direction of the screw to adjust the distance between the two rings and adapt to steel pipes with different outer diameters.

[0067] The transmission structure 45 includes a driving wheel 451, a driven wheel 452 and a transmission belt 453. The driving wheel 451 is sleeved on the extension end 411 connected with the driving motor 42, the driven wheel 452 is sleeved on the extension end 411 of the other bidirectional screw 41, and the transmission belt 453 is sleeved on the outer sides of the driving wheel 451 and the driven wheel 452, so that the two bidirectional screws 41 can be synchronously rotated to ensure that the upper calibration ring 43 and the lower calibration ring 44 move stably.

[0068] (V) Straightening assembly 5

[0069] The straightening assembly 5 is installed on the top of the base 1 and is used for accurate straightening of the steel pipe after preliminary calibration, and includes a moving groove 51, a limiting rod 52, an electric sliding table 53, an electric lifting rod 54 and a straightening plate 55.

[0070] Moving groove 51: Opened at the top of the base 1, extending along the length of the steel pipe, providing a moving space for the electric sliding table 53.

[0071] Limiting rod 52: Fixedly installed inside the moving groove 51, arranged along the length direction of the moving groove 51, used for guiding the movement of the electric sliding table 53, ensuring the straightness of its movement trajectory.

[0072] Electric sliding table 53: Slidingly sleeved on the limiting rod 52, can move smoothly along the limiting rod 52, adjusting the horizontal position of the straightening plate 55.

[0073] Electric lifting rod 54: Vertically installed at the bottom of the electric sliding table 53, with the telescopic end arranged downward, fixedly connected with the straightening plate 55, can drive the straightening plate 55 to lift along the vertical direction, adjusting the straightening pressure.

[0074] Straightening plate 55: The bottom is smooth arc or plane (selected according to the straightening requirement of the steel pipe), in contact with the outer surface of the steel pipe, and the straightening is realized by the pressure applied by the electric lifting rod 54.

[0075] (Six) Components for automatic control

[0076] The component is the control core of the device, which is electrically connected with the inner clamping assembly 2, the outer clamping assembly 3, the calibration assembly 4, the straightening assembly 5 and the electric telescopic rod 13 respectively, realizes the full-process automatic control, including a control unit, a data acquisition unit, a driving unit, an interactive unit and a storage unit:

[0077] Control unit: Using PLC or embedded controller, with three core control logics built-in:

[0078] Clamping force closed-loop control logic: receiving feedback data from the pressure acquisition device, adjusting the extension amount of the cylinder 23 or the output torque of the clamping motor 314, ensuring that the clamping force is stable within the preset threshold range, avoiding damage to the steel pipe or loose clamping.

[0079] Calibration size self-adaptive adjustment logic: according to the outer diameter of the steel pipe collected by the size acquisition device, calculating the target distance between the upper and lower calibration rings 43 and 44, controlling the driving motor 42 to adjust the distance without manual intervention.

[0080] Straightening pressure feedback control logic: receiving feedback data from the bottom pressure acquisition device of the straightening plate 55, adjusting the extension amount of the electric lifting rod 54, so that the straightening pressure is stable at the preset threshold, ensuring the straightening accuracy.

[0081] Data acquisition unit: including pressure acquisition device, displacement acquisition device and size acquisition device:

[0082] Pressure acquisition unit: uses a miniature pressure sensor, respectively installed in the inner clamping plate 244, the inner clamping plate 321 and the straightening plate 55 bottom, used to collect the inner clamping force, the outer clamping force and the straight contact pressure, the accuracy is ±0.1N.

[0083] Displacement acquisition unit: uses a grating displacement sensor, installed beside the sliding rod 12 and the limiting rod 52, used to collect the sliding displacement of the mounting frame 11 and the moving displacement of the electric sliding table 53, the accuracy is ±0.01mm.

[0084] Size acquisition unit: uses a laser ranging sensor, installed between the upper calibration ring 43 and the lower calibration ring 44, used to collect the outer diameter size of the steel pipe, the accuracy is ±0.02mm.

[0085] Driving unit: includes a plurality of sub-driving units (such as cylinder solenoid valve, motor driver), respectively connected with the signal output end of the control unit and each execution element (cylinder 23, clamping motor 314, driving motor 42, electric sliding table 53, electric lifting rod 54, electric telescopic rod 13), receiving the instruction of the control unit and driving the execution element to act, adjusting the parameters such as cylinder extension amount, motor speed and steering, sliding table moving speed, etc.

[0086] Interaction unit: uses a touch display screen, electrically connected with the control unit, which can realize parameter input (steel pipe specification, target clamping force, straightening pressure, etc.), state display (real-time clamping force, calibration size, straightening pressure, displacement, etc.) and mode switching (manual / automatic mode), which can directly control the action of each execution element in manual mode, used for equipment debugging or special working conditions.

[0087] Storage unit: uses EEPROM and SD card combined storage, electrically connected with the control unit, automatically stores the parameters (steel pipe specification, clamping force, calibration size, straightening pressure) and processing time of each processing, supports data export, and is convenient for subsequent process tracing and optimization.

[0088] Four, calibration method

[0089] The method is suitable for the above-mentioned steel pipe machining precision calibration device, and the whole process is accurately controlled through the automatic control assembly, and the specific steps are as follows:

[0090] S1: parameter input and calibration component pre-adjustment

[0091] The operator inputs the specification parameters (such as outer diameter 50mm, material Q235) and process parameters (target inner clamping force 50N, target outer clamping force 30N, target straightening pressure 120N) of the steel pipe to be processed through the interaction unit;

[0092] After the control unit receives the parameters, it calculates the target distance of the calibration assembly 4 (steel pipe outer diameter + 0.5-1mm gap, such as 50.8mm) according to the built-in algorithm and outputs instructions to the drive unit;

[0093] The drive unit controls the drive motor 42 to start, and the drive motor 42 drives the extension end 411 of the connected bidirectional screw 41 to rotate, which in turn drives the other bidirectional screw 41 to rotate synchronously through the driving wheel 451, transmission belt 453 and driven wheel 452;

[0094] The two bidirectional screws 41 rotate synchronously, driving the upper calibration ring 43 and the lower calibration ring 44 to move axially along the screw, until the distance between the two reaches the target distance, and the drive motor 42 stops;

[0095] The operator passes the steel pipe to be processed between the upper calibration ring 43 and the lower calibration ring 44 until the end to be clamped of the steel pipe extends between the inner clamping assembly 2 and the outer clamping assembly 3, and the axis of the steel pipe coincides with the central axis of the inner fixing structure 24 and the outer fixing structure 32.

[0096] S2: Simultaneous clamping of the inner and outer walls of the steel pipe

[0097] The control unit outputs start instructions to the cylinder 23 and the clamping motor 314 through the drive unit: the driving end of the cylinder 23 pushes the moving block 22 to slide in the limiting frame 21, the inclined slide groove 221 of the moving block 22 drives the moving shaft 241 to rise, and the moving shaft 241 pushes the inner clamping plate 244 to move closer to the inner wall of the steel pipe through the moving plate 242 and the inner clamping spring 243; at the same time, the clamping motor 314 drives the clamping screw 315 to rotate, the clamping sliding block 316 slides along the clamping screw 315, and the limiting block 312 and the limiting clamp 313 are driven to move closer to the protrusion 3211 of the outer fixing structure 32 through the transmission rod 317;

[0098] The pressure acquisition components on the inner side of the inner clamping plate 244 and the inner side of the outer clamping plate 321 collect clamping force data in real time and feed back to the control unit;

[0099] The control unit adjusts through the clamping force closed-loop control logic: if the clamping force is less than the target value, increase the extension amount of the cylinder 23 or the output torque of the clamping motor 314; if the clamping force is greater than the target value, decrease the corresponding output;

[0100] When the inner clamping force stabilizes at 50N±0.5N and the outer clamping force stabilizes at 30N±0.5N, the control unit stops driving the cylinder 23 and the clamping motor 314, and the simultaneous clamping of the inner and outer walls of the steel pipe is completed.

[0101] S3: Preliminary calibration of the steel pipe

[0102] The control unit starts the electric telescopic rod 13 through the driving unit, the electric telescopic rod 13 drives the mounting frame 11 to slide slowly along the sliding rod 12 (speed 5-10 mm / s), the steel pipe moves with the mounting frame 11 and passes through between the upper calibration ring 43 and the lower calibration ring 44 of the calibration assembly 4;

[0103] The size acquisition piece between the upper calibration ring 43 and the lower calibration ring 44 detects the outer diameter of the steel pipe in real time, if it is detected that the local outer diameter deviation exceeds the preset tolerance (such as ±0.1 mm), the deviation data is fed back to the control unit;

[0104] The control unit outputs fine adjustment instructions to the driving unit through the calibration size self-adaptive adjustment logic, controls the driving motor 42 to rotate, fine adjusts the spacing of the upper calibration ring 43 and the lower calibration ring 44, and corrects the deviation part;

[0105] When the steel pipe passes through the calibration assembly 4 and the outer diameter deviation is all ≤±0.1 mm, the control unit stops the electric telescopic rod 13, and the preliminary calibration is completed.

[0106] S4: straightening of the steel pipe

[0107] The control unit determines the position of the bent part of the steel pipe according to the displacement data of the mounting frame 11 fed back by the displacement acquisition piece, outputs instructions to the driving unit: controls the electric sliding table 53 to move to the bent part directly above along the limiting rod 52, and the moving position of the electric sliding table 53 is calibrated in real time through the displacement acquisition piece beside the limiting rod 52;

[0108] The control unit controls the electric lifting rod 54 to slowly descend (speed 2-5 mm / s), drives the straightening plate 55 to approach the surface of the steel pipe, and the pressure acquisition piece at the bottom of the straightening plate 55 acquires straightening pressure data in real time and feeds back to the control unit;

[0109] The control unit adjusts the telescopic amount of the electric lifting rod 54 through the straightening pressure feedback control logic: when the straightening pressure reaches the target value 120 N±1 N, the pressure is maintained for 3-5 seconds, so that the steel pipe is fully deformed and recovered;

[0110] After the pressure maintaining is completed, the control unit controls the electric lifting rod 54 to rise and reset, if there are multiple bent parts, steps 1-3 are repeated until the straightness of the whole length of the steel pipe meets the requirements (such as ≤0.1 mm / m), and the straightening is completed.

[0111] S5: data storage and assembly reset

[0112] After the straightening is completed, the control unit outputs instructions to the storage unit, and automatically stores the processing data (steel pipe specification, clamping force, calibration size, straightening pressure, processing time) of this time;

[0113] The control unit controls the components to reset through the driving unit: the electric lifting rod 54 rises to the highest position, the electric sliding table 53 moves back to the initial position, the electric telescopic rod 13 drives the mounting frame 11 to reset, the air cylinder 23 and the clamping motor 314 reverse to release the steel pipe, the distance between the upper calibration ring 43 and the lower calibration ring 44 is adjusted to the maximum;

[0114] The operator takes off the straightened steel pipe, and the single-time processing is completed.

[0115] In the description of the present specification, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0116] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0117] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A steel pipe machining accuracy calibration device characterized by comprising: The device comprises a base (1), an inner clamping assembly (2), an outer clamping assembly (3), a calibration assembly (4), a straightening assembly (5), and an assembly for automatic control; The assembly for automatic control is electrically connected with the inner clamping assembly (2), the outer clamping assembly (3), the calibration assembly (4), and the straightening assembly (5) respectively, for coordinated control of the clamping action of the inner clamping assembly (2), the limiting and clamping action of the outer clamping assembly (3), the size adjustment action of the calibration assembly (4), the straightening position and pressure adjustment action of the straightening assembly (5), and the sliding action of the mounting rack (11) on the base (1), to realize precise control of the steel pipe clamping, calibration, and straightening process.

2. The steel pipe accuracy calibration device according to claim 1, characterized by The assembly for automatic control comprises a control unit, a data acquisition unit, and a driving unit; The data acquisition unit is electrically connected with the signal input end of the control unit, for acquisition of the steel pipe clamping state, calibration size, straightening pressure, and mounting rack (11) displacement data; The driving unit is electrically connected with the signal output end of the control unit and the execution elements of the inner clamping assembly (2), the outer clamping assembly (3), the calibration assembly (4), and the straightening assembly (5) respectively, for receiving the instructions of the control unit and driving the corresponding execution elements to act.

3. The steel pipe accuracy calibration device according to claim 2, characterized by The data acquisition unit comprises: A pressure acquisition part is respectively installed on the inner side of the inner clamping plate (244) of the inner clamping assembly (2), the inner side of the outer clamping plate (321) of the outer clamping assembly (3), and the bottom of the straightening plate (55) of the straightening assembly (5), for acquisition of the inner clamping force, the outer clamping force, and the direct contact pressure of the straightening; A displacement acquisition part is installed beside the sliding rod (12) of the base (1) and beside the limiting rod (52) of the straightening assembly (5), for acquisition of the sliding displacement of the mounting rack (11) and the moving displacement of the electric sliding platform (53); A size acquisition part is installed between the upper calibration ring (43) and the lower calibration ring (44) of the calibration assembly (4), for acquisition of the outer diameter size of the steel pipe to be processed.

4. The steel pipe accuracy calibration device according to claim 2, characterized by The driving unit comprises a plurality of sub-driving parts, which correspond to the control of: The cylinder (23) of the inner clamping assembly (2), for adjusting the extension amount of the cylinder (23) to control the clamping stroke of the inner clamping plate (244); The clamping motor (314) of the outer clamping assembly (3), for adjusting the rotation speed and direction of the clamping motor (314) to control the clamping tightness of the limiting clamp (313); The driving motor (42) of the calibration assembly (4), for adjusting the rotation speed and direction of the driving motor (42) to control the distance between the upper calibration ring (43) and the lower calibration ring (44); The electric sliding platform (53) and the electric lifting rod (54) of the straightening assembly (5), for respectively adjusting the moving speed of the electric sliding platform (53) and the extension amount of the electric lifting rod (54); The electric telescopic rod (13) of the base (1), for adjusting the extension speed of the electric telescopic rod (13) to control the sliding speed of the mounting rack (11).

5. The steel pipe accuracy calibration apparatus according to claim 3, characterized by The control unit is provided with clamping force closed-loop control logic: when the inner clamping force or the outer clamping force collected by the pressure collecting part is less than a preset threshold value, the control unit increases the extension amount of the air cylinder (23) or the output torque of the clamping motor (314) through the driving unit; when the clamping force is greater than the preset threshold value, the output of the corresponding executing element is reduced to avoid damaging the steel pipe or over-clamping.

6. The steel pipe accuracy calibration apparatus according to claim 3, wherein The control unit is provided with calibration size self-adaptive adjustment logic: after the size collecting part collects the outer diameter size of the steel pipe to be processed, the control unit calculates the target distance between the upper calibration ring (43) and the lower calibration ring (44) according to the size, and controls the driving motor (42) to rotate through the driving unit, so as to drive the double-direction lead screw (41) to adjust the upper calibration ring (43) and the lower calibration ring (44) to the target distance, without manual adjustment.

7. The steel pipe accuracy calibration apparatus according to claim 3, wherein The control unit is provided with straightening pressure feedback control logic: during the straightening process, the pressure collecting part at the bottom of the straightening plate (55) feeds back the contact pressure in real time, the control unit adjusts the extension amount of the electric lifting rod (54) according to a preset straightening pressure threshold value through the driving unit, so as to stabilize the straightening pressure in the threshold value range, ensure the straightening accuracy, and avoid the deformation of the steel pipe.

8. The steel pipe accuracy calibration apparatus according to claim 2, wherein The component for automatic control further comprises an interaction unit electrically connected with the control unit, and is used for: inputting steel pipe specifications, target clamping force, straightening pressure and the like; displaying real-time clamping force, calibration size, straightening pressure, mounting frame displacement and the like state data; providing manual / automatic mode switching function, and directly controlling the actions of each executing element in the manual mode.

9. The steel pipe accuracy calibration apparatus according to claim 2, characterized by The component for automatic control further comprises a storage unit electrically connected with the control unit, and is used for storing the parameters (steel pipe specifications, clamping force, calibration size, straightening pressure) and processing time of each steel pipe processing, so as to facilitate subsequent tracing and process optimization.

10. A method of calibrating the accuracy of a steel pipe machining process, suitable for use with the apparatus of any one of claims 1 to 9, characterised in that, The method comprises the following steps: S1, inputting the specification parameters of the steel pipe to be processed through the interaction unit, and calculating the target distance of the calibration assembly (4) according to the specification parameters, so as to drive the driving motor (42) to adjust the upper calibration ring (43) and the lower calibration ring (44) to the target distance, and pass the steel pipe through the calibration rings; S2, starting the air cylinder (23) of the inner clamping assembly (2) and the clamping motor (314) of the outer clamping assembly (3) through the driving unit, collecting clamping force data from the pressure collecting part, and adjusting to the target clamping force in a closed loop, so as to complete the synchronous clamping of the inner and outer walls of the steel pipe; S3, driving the electric telescopic rod (13) to slide the mounting frame (11) through the control unit, so as to move the steel pipe along the calibration assembly (4), and the size collecting part detects the outer diameter of the steel pipe in real time, and adjusts the distance between the calibration rings through the control unit if there is deviation, so as to complete the preliminary calibration; S4, driving the electric sliding table (53) to move to the straightening position through the control unit, driving the straightening plate (55) to descend through the electric lifting rod (54), adjusting the straightening pressure in combination with the feedback of the pressure collecting part, and completing the straightening of the steel pipe; S5, after the processing is completed, the storage unit automatically saves the processing data, the control unit controls the components to reset, and the steel pipe is removed.

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