Method for determining deviation of hot blast tuyere opening of blast furnace by theodolite

Abstract

This invention discloses a method for determining the opening deviation of a blast furnace hot blast pipe using a theodolite, comprising: a flange at the bottom of the reducer, with symmetrical screw holes on the flange; two steel wires are stretched between the center points of the screw holes; the center point of the reducer is found through the intersection of the steel wires; similarly, the center points of all reducers are found and marked for later use; a flange with multiple symmetrical screw holes is also on the large sleeve; the center points of all large sleeves are found using the same method as above and marked for later use; the theodolite is set up on the extension line of the center line of a pair of large sleeves, zeroed, and locked; the theodolite's aiming part is rotated vertically to aim at the reducer, and the extension line of the center line is marked on the reducer; the distance between the center point of the reducer and the extension line of the center line is measured and recorded using a ruler; the above process is repeated to measure and record the installation deviation of all reducers. This invention uses a theodolite for measurement, which can help the client verify the opening accuracy of the hot blast pipe.

Description

Technical Field

[0001] This invention relates to the field of measurement technology, and in particular to a method for determining the opening deviation of the hot blast pipe in a blast furnace using a theodolite. Background Technology

[0002] When replacing blast furnace hot blast pipes, the most common method currently used is to create openings using molds. However, due to the limitations and unpredictable nature of mold manufacturing, it's impossible to accommodate the dimensional variations of every air inlet pipe, leading to deviations in the opening position. Furthermore, the precision of using molds for openings is uncertain. Therefore, a method is needed to accurately evaluate the precision of openings in blast furnace hot blast pipes.

[0003] Comparative Data 1: Auxiliary tools for opening tuyeres in blast furnace hot blast pipes

[0004] This utility model provides an auxiliary tool for quickly and accurately locating the opening position of the tuyeres in a blast furnace hot blast casing under simulated connected conditions. It includes a horizontal pipe and an inclined pipe. One end of the inclined pipe is fixed to the left end of the horizontal pipe by a support rod, and the other end of the inclined pipe is connected to the gooseneck pipe of the tuyeres device via a large flange. The inclined pipe has a discontinuous structure, with a small flange connecting the discontinuity. The right end of the horizontal pipe rests against the small sleeve of the tuyeres.

[0005] Using this device, no special measuring instruments or scaffolding are required, enabling rapid and accurate positioning of the opening location of the blast furnace hot blast duct tuyeres. However, this method can only be used for opening the blast furnace hot blast duct; it cannot verify the accuracy of the opening.

[0006] Comparative Data 2: Methods for opening holes in the hot blast duct of the blast furnace blasting device

[0007] This invention relates to the installation of blast furnace blasting systems in metallurgical engineering, specifically a method for drilling holes in the hot blast duct of a blast furnace blasting system. The steps include: measuring the blast furnace tuyere flange data; measuring the actual dimensions of the blast furnace blasting system; fabricating a positioning jig for drilling; fabricating a template for drilling on the hot blast duct; projecting the longitudinal center axis of the drilling onto the hot blast duct using a theodolite; positioning the center point of the drilling using the positioning jig; drawing the edge line of the drilling on the hot blast duct using the template; and cutting the drilling along the edge line on the hot blast duct. This invention uses actual construction data for measurement and correction, employs a method of projecting the center axis using measuring instruments and combining it with a positioning jig to determine the precise center point of the drilling, and uses the template to achieve accurate drilling. The process is simple and quick, effectively ensuring and improving the installation quality of the blasting system. This method, however, is complex to operate, time-consuming to drill holes, and can only be used for drilling holes in the blast furnace hot blast duct, without verifying the accuracy of the drilling.

[0008] Comparative Data 3: Installation Method of Blast Furnace Tunnels

[0009] This invention discloses an installation method for blast furnace tuyeres that improves installation quality. The specific process is as follows: First, the center of the connecting pipe hole is determined using geometric methods; then, a pre-drilled hole is made on the hot blast duct with the connecting pipe hole center as the center; the connecting pipe is placed into the pre-drilled hole; next, the other components of the tuyeres are installed between the connecting pipe and the tuyeres using an integral installation method; then, the hole on the hot blast duct is gradually enlarged, and the position of the connecting pipe is adjusted to ensure that the installation angle of the tuyeres and the horizontality of the straight-blowing pipe meet the installation requirements; finally, the connecting pipe is welded and fixed to the hot blast duct. This installation method improves the overall installation quality of the tuyeres, enhances the blast furnace's production capacity and efficiency, and also improves the interchangeability between different tuyeres. However, this method can only perform the drilling of the hot blast duct and cannot verify the accuracy of the drilling. Summary of the Invention

[0010] The purpose of this invention is to provide a method for determining the opening deviation of the hot blast casing of a blast furnace using a theodolite. Using a theodolite for measurement can help the client verify the opening accuracy of the hot blast casing, thereby completing the evaluation of the opening accuracy of the hot blast casing of the blast furnace by the construction unit, which is beneficial to improving the installation quality of the equipment.

[0011] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0012] This invention discloses a method for determining the opening deviation of a blast furnace hot blast pipe using a theodolite, comprising: a flange at the bottom of the reducer, with multiple symmetrical screw holes on the flange; two steel wires are stretched between the center points of the screw holes, and the center point of the reducer is found through the intersection of the steel wires; similarly, all center points of the reducers are found and marked for later use; a flange on the main sleeve also has multiple symmetrical screw holes, and the center points of all the main sleeves are found using the same method as above and marked for later use; a theodolite is set up on the extension line of the center line of a pair of main sleeves, zeroed, and locked; the theodolite's aiming part is rotated vertically to aim at the reducer, and the extension line of the center line is marked on the reducer; the distance between the center point of the reducer and the extension line of the center line is measured using a ruler and recorded; the above process is repeated to measure and record the installation deviations of all reducers.

[0013] Furthermore, the specific steps include the following:

[0014] 1) The bottom of the reducer is a flange with multiple symmetrical screw holes. Use a ruler to find the center point of the first, second, third, and fourth screw holes. Stretch a second steel wire between the center points of the first and third screw holes. Similarly, stretch a first steel wire between the center points of the second and fourth screw holes. The intersection of the first and second steel wires is the center point of the reducer. Use a ruler and steel wires to find all the center points of the reducer and mark them for later use.

[0015] 2) There are also flanges on the large sleeves, which have multiple symmetrical screw holes. Use the same method as in step 1) to find the center point of all the large sleeves and mark them for later use.

[0016] 3) Set up the theodolite on the extended center line of a pair of large sets, the first large set and the second large set, set it to zero and lock it; use the traditional carrying method to adjust the position of the theodolite multiple times, or use the method of pulling a steel wire at the center point of the first large set and the second large set, then setting up the theodolite, and adjusting the position of the theodolite to align with the steel wire to complete this work.

[0017] 4) Rotate the theodolite's aiming head vertically to aim at the diameter reducer and mark the extension of the centerline on the diameter reducer;

[0018] 5) Use a ruler to measure and record the distance between the center point of the diameter change and the extension of the center line;

[0019] 6) Repeat steps 2), 3), 4) and 5) to complete the measurement and recording of the installation deviations of all diameter reducers.

[0020] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0021] When replacing the hot blast casing in a blast furnace, the accuracy of the opening of the hot blast casing is verified by using the linear relationship between the diameter change and the large sleeve.

[0022] This method requires no tooling; the work can be completed with just a theodolite and simple tools, which helps improve the installation quality of the blast furnace hot blast casing. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a general view of the method for determining the opening deviation of the hot blast pipe in a blast furnace using a theodolite according to the present invention.

[0025] Figure 2 This is a schematic view of the method for determining the variable diameter center point of the method for determining the opening deviation of the hot blast pipe of the present invention using a theodolite;

[0026] Figure 3 This is a flowchart illustrating the method of determining the opening deviation of the hot blast pipe in a blast furnace using a theodolite according to the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1-Blast furnace; 2-Hot blast casing; 3.1-First large casing; 3.2-Second large casing; 4-Reducing diameter; 5.1-First screw hole, 5.2-Second screw hole, 5.3-Third screw hole, 5.4-Fourth screw hole; 6.1-First steel wire, 6.2-Second steel wire.

[0028] The first and second sets are a pair of sets facing each other, and the line connecting the centers of the two sets passes through the center of the blast furnace. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 , 2 3. The implementation of the technical solution will be described in a more detailed manner in order to make the working principle of the gate clearer and more understandable.

[0030] When replacing the hot blast casing 2 in blast furnace 1, in order to verify the accuracy of the opening of the hot blast casing 2, the linear relationship between the variable diameter 4 and the large sleeve 3 is used to verify the accuracy of the opening of the hot blast casing 2.

[0031] A method for determining the opening deviation of a blast furnace hot blast pipe using a theodolite specifically includes the following steps:

[0032] The bottom of the reducer is a flange with multiple symmetrical screw holes, such as... Figure 2 As shown, use a ruler to find the center points of the first screw hole 5.1, the second screw hole 5.2, the third screw hole 5.3, and the fourth screw hole 5.4. Stretch a second steel wire 6.2 between the center points of the first screw hole 5.1 and the third screw hole 5.3. Similarly, stretch a first steel wire 6.1 between the center points of the second screw hole 5.2 and the fourth screw hole 5.4. The intersection of the first steel wire 6.1 and the second steel wire 6.2 is the center point of the diameter reducer 4. Use a ruler and steel wire to find the center points of all diameter reducers and mark them for later use.

[0033] 2. There are also flanges on the large sleeves, which have multiple symmetrical screw holes. Use the same method as in step 1 to find the center point of all the large sleeves and mark them for later use.

[0034] 3. Set up the theodolite on the extended centerline of a pair of large sets, namely the first large set 3.1 and the second large set 3.2, zero the instrument and lock it. The traditional method of adjusting the theodolite's position multiple times (generally requiring 3 adjustments) can be used; however, this method is frequently used in actual surveying and will not be described in detail here. Alternatively, a steel wire can be stretched between the center points of the first large set 3.1 and the second large set 3.2, and then the theodolite can be set up and its position adjusted to align with the steel wire. This method is less efficient and not recommended. Finally, a method using a laser and a total station clamping fixture (patent 2022219655077) can be used to complete this task.

[0035] 4. Rotate the theodolite's aiming part vertically to aim at the diameter reducer 4 and mark the extension of the center line on the diameter reducer 4;

[0036] 5. Use a ruler to measure and record the distance between the center point of the diameter change and the extension of the center line;

[0037] 6. Repeat steps 2, 3, 4, and 5 to complete the measurement and recording of the installation deviations for all diameter reducers.

[0038] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for determining the opening deviation of a blast furnace hot blast pipe using a theodolite, characterized in that, include: The reducer has a flange at its bottom with multiple symmetrical screw holes. Two steel wires are stretched between the center points of these screw holes; the center point of the reducer can be found by finding the intersection of these wires. Similarly, find the center points of all reducers and mark them for later use. The large sleeve also has a flange with multiple symmetrical screw holes. Use the same method to find the center points of all large sleeves and mark them for later use. Set up the theodolite on the extended centerline of a pair of large sleeves, zero it, and lock it. Rotate the theodolite's aiming head vertically to aim at the reducer and mark the extended centerline on the reducer. Use a ruler to measure and record the distance between the reducer's center point and the extended centerline. Repeat the above process to measure and record the installation deviations of all reducers.

2. The method for determining the opening deviation of the blast furnace hot blast pipe using a theodolite according to claim 1, characterized in that, Specifically, the steps include the following: 1) The bottom of the reducer (4) is a flange. There are multiple symmetrical screw holes on the flange. Use a ruler to find the center point of the first screw hole (5.1), the second screw hole (5.2), the third screw hole (5.3), and the fourth screw hole (5.4). Stretch a second steel wire (6.2) between the center points of the first screw hole (5.1) and the third screw hole (5.3). Similarly, stretch a first steel wire (6.1) between the center points of the second screw hole (5.2) and the fourth screw hole (5.4). The intersection of the first steel wire (6.1) and the second steel wire (6.2) is the center point of the reducer (4). Use a ruler and steel wire to find the center points of all the reducers and mark them for later use. 2) There is also a flange on the large sleeve (3), which has multiple symmetrical screw holes. Use the same method as in step 1) to find the center point of all the large sleeves (3) and mark them for later use. 3) Set up the theodolite on the extended center line of the first large set (3.1) and the second large set (3.2), set it to zero and lock it; use the traditional carrying pole method to adjust the position of the theodolite multiple times, or use the method of pulling a steel wire at the center point of the first large set (3.1) and the second large set (3.2), then set up the theodolite and adjust the position of the theodolite to be aligned with the steel wire to complete this work; 4) Rotate the theodolite's aiming part vertically to aim at the variable diameter (4) and mark the extension of the center line on the variable diameter (4); 5) Use a ruler to measure and record the distance between the center point of the diameter change and the extension of the center line; 6) Repeat steps 2), 3), 4) and 5) to complete the measurement and recording of the installation deviations of all diameter reducers.

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