A rolling mill installation measurement method

Abstract

This invention discloses a rolling mill installation measurement method, comprising the following steps: establishing a precision construction control network; locating both ends of the centerline, and erecting a reference disc above a deep foundation at both ends of the rolling mill centerline. The positioning of the reference disc is determined by the polar coordinate method of the traverse points of the precision construction control network, forming a closed traverse and a closed leveling route; locating the dividing points of the rolling mill centerline, and laying out the short dividing lines of the rolling mill equipment; repeating steps three and four to test the short dividing lines of each equipment in the primary and finishing mills, thereby achieving precision measurement for rolling mill installation. This invention can accurately and reliably locate the rolling mill centerline, ensuring the installation accuracy of the rolling mill.

Description

Technical Field

[0001] This invention relates to the field of metallurgical engineering technology, specifically a method for measuring the installation of a rolling mill. Background Technology

[0002] Steel rolling mills are key pieces of equipment in the steel industry used for rolling steel products, and have the following important uses:

[0003] Steel rolling mills can process initial steel billets into various shapes of steel products through a series of rolling processes, such as I-beams, channel steel, angle steel, H-beams, and other profiles.

[0004] In addition to profiles, rolling mills can also produce plates and tubes. For plate production, the mill can roll steel billets into steel plates of different thicknesses, including thin plates, medium plates, and thick plates.

[0005] Steel rolling mills can also improve the strength and toughness of steel. Through plastic deformation during the rolling process, the internal microstructure of the steel changes, the grains are refined, and the dislocation density increases, thereby improving the strength and toughness of the steel. For example, high-strength construction steel produced through rolling exhibits significantly improved yield strength and tensile strength, better meeting the strength requirements of building structures while maintaining good toughness to prevent brittle fracture during use. During the rolling process, steel rolling mills need to precisely control the dimensional accuracy of the steel to ensure that the produced steel meets various industry standards and application requirements.

[0006] However, current rolling mills cannot guarantee overall positioning accuracy during installation. The positioning points during installation are not durable and are easily damaged, affecting the installation accuracy of the rolling mill and ultimately affecting the rolling accuracy. Summary of the Invention

[0007] The purpose of this invention is to solve the problems mentioned in the background art by providing a rolling mill installation measurement method that can accurately and reliably locate the rolling mill centerline and ensure the installation accuracy of the rolling mill.

[0008] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0009] A method for measuring the installation of a rolling mill includes the following steps:

[0010] S1. Establishment of a Precision Construction Control Network

[0011] A precision traverse network and a precision leveling network are laid around the steel rolling plant area to form a precision control network for construction.

[0012] S2, positioning at both ends of the centerline

[0013] A reference disc is erected above the deep foundations at both ends of the mill centerline. The positioning of the reference disc is determined by the polar coordinate method of the traverse points of the construction precision control network, forming a closed traverse and a closed leveling route.

[0014] S3, Mill centerline dividing point positioning

[0015] Set up the total station at point Q on the center line, place a steel plate at the center of the instrument on the ground, aim at the crosshairs of the visual optical centering device, and use a punch drill to fix the point on the steel plate to obtain the precise location of point Q.

[0016] S4. Short line layout of rolling mill equipment dividing line

[0017] Without changing the instrument position, reset the measuring station, aim at one of the reference disks to set the zero direction, and aim at the other reference disk to verify the direction. Rotate the instrument to 90 degrees and 270 degrees respectively, aim at the prism set up on the tripod, and fine-tune the prism to obtain the accurate position. At this time, place a steel plate at the center of the prism ground, aim at the crosshairs of the visual optical centering device, and use a punch drill to fix the point on the steel plate to obtain the accurate direction of the short line of the rolling mill.

[0018] S5. Repeat steps three and four to test the short lines of the dividing lines of each piece of equipment in the primary rolling and finishing rolling mills, so as to achieve precise measurement of the mill installation.

[0019] In step S1, the technical requirements for first-order traverse and second-order leveling are applied. Traverse surveying uses a closed traverse, with a relative mean square error of less than 1 / 30000 for distance measurement, a relative mean square error of less than 1 / 15000 for the total traverse length, and a total mean square error of no more than 2 mm per kilometer for leveling. The forward and backward deviations and the closure error are no greater than 4. L is the route length, and the three-dimensional coordinates of the control points are obtained through rigorous adjustment.

[0020] In step S2, the average value is taken by two round trip observations and used as control points one and two of the mill centerline to control the straightness of the entire mill line.

[0021] In step S3, the high-precision total station is set up at any point Q on the center line. The reference disks on both sides are observed using the direct and inverted mirror method. After aiming at point one with the direct and inverted mirrors, the telescope is inverted to aim at point two. The total station is gradually placed closer to the line connecting the two known points one and two, so that point Q and points one and two are collinear. At this time, a steel plate is placed at the center of the instrument on the ground. The crosshairs of the visual optical centering device are used for aiming, and the point is fixed on the steel plate with a punch drill to obtain the precise position of point Q.

[0022] In step S3, the upright mirror is the left side of the reference disk, and the inverted mirror is the right side of the reference disk.

[0023] In step S4, the angular deviation between reference disk one and reference disk two is no greater than 1″.

[0024] Beneficial effects:

[0025] This invention first establishes a precision construction control network to ensure overall positioning accuracy; secondly, it innovates a reference disc positioning device at both ends of the centerline; then, it utilizes a high-precision total station to accurately locate the centerline and equipment dividing axis positions, cleverly employing the precise surface points of the positioning steel plates, making the positioning points accurate, durable, and resistant to damage. Through these methods, the mill centerline and the dividing lines of each piece of equipment are obtained, with each intersection ensuring an accuracy of no more than 1mm. The straightness meets the installation and usage requirements of the rolling mill equipment, achieving precise measurement for mill installation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart of the mill installation and measurement method of the present invention;

[0028] Figure 2 A schematic diagram showing the positioning of the center line of the rolling mill;

[0029] Figure 3 This is a schematic diagram of a rolling mill line;

[0030] Figure 4 This is a schematic diagram of traverse measurement.

[0031] Figure 5 This is a schematic diagram of a leveling survey.

[0032] Figure 6 A schematic diagram of the reference disk;

[0033] Figure 7 This is a schematic diagram of a total station. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] As shown in the figure, this invention discloses a rolling mill installation measurement method, including the following steps:

[0036] S1. Establish a precise construction control network

[0037] like Figure 2As shown, a precision traverse network and a precision leveling network are laid out around the steel rolling plant area to form a precision control network (three-dimensional measurement and control network). The surveying is conducted using first-order traverse and second-order leveling techniques. Traverse surveying uses closed traverses, with a relative mean square error of less than 1 / 30000 for distance measurement, a relative mean square error of less than 1 / 15000 for the total traverse length, and a total mean square error of no more than 2mm per kilometer for leveling. The forward and backward deviations and the closure error are no greater than 4. (where L is the route length). The three-dimensional coordinates of the control points are obtained through rigorous adjustment.

[0038] S2, both ends of the positioning center line

[0039] A reference disc is erected above a deep foundation at both ends of the rolling mill centerline. The reference disc is as follows: Figure 6 As shown, the positioning of the reference disk is determined by the polar coordinate method of the traverse points of the construction precision control network, forming a closed traverse and a closed leveling route. The average value is obtained by two round trip observations, which are used as control points one and two of the mill centerline to control the straightness of the entire mill line.

[0040] S3, Positioning mill centerline dividing point

[0041] Set up the total station at point Q on the center line, place a steel plate at the center of the instrument on the ground, aim at the crosshairs of the visual optical centering device, and use a punch drill to fix the point on the steel plate to obtain the precise position of point Q. The accuracy of the total station here is 0.5″.

[0042] S4. Short line layout of rolling mill equipment dividing line

[0043] like Figure 3 Without changing the instrument position, reset the measuring station, aim at one of the reference disks to set the zero direction, and aim at the other reference disk to verify the direction. Rotate the instrument to 90 degrees and 270 degrees respectively, aim at the prism set up on the tripod, fine adjust the prism to obtain the accurate position, and then place a steel plate at the center of the prism on the ground. Aim at the crosshairs of the visual optical centering device and use a punch drill to fix the point on the steel plate to obtain the precise direction of the short line of the rolling mill.

[0044] S5. Repeat steps three and four to test the short lines of the dividing lines of each piece of equipment in the primary rolling and finishing rolling mills, so as to achieve precise measurement of the mill installation.

[0045] In step S3, the high-precision total station is set up at any point Q on the centerline, as shown by the high-precision total station. Figure 7 As shown, the two reference disks are observed using the upright and inverted mirror method, as follows: Figure 4After aiming the telescope at point 1# using the upright telescope (left of the reference disk) and the inverted telescope (right of the reference disk), then invert the telescope to aim at point 2#. Gradually position the total station on the line connecting point 1# and point 2#, ensuring that point Q, point 1#, and point 2# are collinear. At this point, place a steel plate at the center of the instrument on the ground. Aim the instrument using the crosshairs of the visual optical centering device and use a drill to fix the point on the steel plate to obtain the precise location of point Q. Horizontal angle measurements have errors in the horizontal axis, line of sight, and circle eccentricity; vertical angle observations have errors in the vertical circle index. These errors can be eliminated by taking the average value of observations using the upright and inverted telescope method.

[0046] In step S4, the angular deviation between reference disk one and reference disk two is no greater than 1″.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for measuring the installation of a rolling mill, characterized in that, Includes the following steps: S1. Establish a precise construction control network A precision traverse network and a precision leveling network are laid around the steel rolling plant area to form a precision control network for construction. S2, both ends of the positioning center line A reference disc is erected above the deep foundations at both ends of the mill centerline. The positioning of the reference disc is determined by the polar coordinate method of the traverse points of the construction precision control network, forming a closed traverse and a closed leveling route. S3, Positioning mill centerline dividing point Set up the total station at point Q on the center line, place a steel plate at the center of the instrument on the ground, aim at the crosshairs of the visual optical centering device, and use a punch drill to fix the point on the steel plate to obtain the precise location of point Q. S4. Short line layout of rolling mill equipment dividing line Without changing the instrument position, reset the measuring station, aim at one of the reference disks to set the zero direction, and aim at the other reference disk to verify the direction. Rotate the instrument to 90 degrees and 270 degrees respectively, aim at the prism set up on the tripod, and fine-tune the prism to obtain the accurate position. At this time, place a steel plate at the center of the prism ground, aim at the crosshairs of the visual optical centering device, and use a punch drill to fix the point on the steel plate to obtain the accurate direction of the short line of the rolling mill. S5. Repeat steps three and four to test the short lines of the dividing lines of each piece of equipment in the primary rolling and finishing rolling mills, so as to achieve precise measurement of the mill installation.

2. The rolling mill installation measurement method according to claim 1, characterized in that, In step S1, the technical requirements for first-order traverse and second-order leveling are applied. Traverse surveying uses a closed traverse, with a relative mean square error of less than 1 / 30000 for distance measurement, a relative mean square error of less than 1 / 15000 for the total traverse length, and a total mean square error of no more than 2 mm per kilometer for leveling. The forward and backward deviations and the closure error are no greater than 4. L is the route length, and the three-dimensional coordinates of the control points are obtained through rigorous adjustment.

3. The rolling mill installation measurement method according to claim 1, characterized in that, In step S2, the average value is taken by two round trip observations and used as control points one and two of the mill centerline to control the straightness of the entire mill line.

4. The rolling mill installation measurement method according to claim 3, characterized in that, In step S3, the reference disks on both sides are observed using the direct and inverted mirror method. After aiming at point one with the direct and inverted mirrors, the telescope is then inverted to aim at point two. The total station is gradually positioned on the line connecting the two known points one and two, so that point Q and points one and two are collinear. At this time, a steel plate is placed at the center of the instrument on the ground. The crosshairs of the visual optical centering device are used for aiming, and a drill is used to fix the point on the steel plate to obtain the precise position of point Q.

5. The rolling mill installation measurement method according to claim 4, characterized in that, In step S3, the upright mirror is the left side of the reference disk, and the inverted mirror is the right side of the reference disk.

6. The rolling mill installation measurement method according to claim 1, characterized in that, In step S4, the angular deviation between reference disk one and reference disk two is no greater than 1″.

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