A wrapping belt and method for preventing the falling of a blast furnace top distribution chute

Abstract

The application relates to a wrapping belt and method for preventing the falling of a blast furnace top distribution chute, and belongs to the technical field of metallurgical industry equipment. The wrapping belt comprises a belt body, mounting holes are arranged at the two ends of the belt body, the thickness of the belt body is 6-8 mm, and the width of the belt body is greater than or equal to 34 mm. The wrapping belt is pre-installed on a gear box tilting large shaft goose plate. When normal production is carried out, the goose plate and the distribution chute are not affected. When the eccentric pin shaft is cut off and the distribution chute tilts below 20.32 DEG, the distribution chute can be pulled to prevent the distribution chute from separating from the goose plate, so that the distribution chute can still work until the next maintenance period, the blast furnace top is opened to discharge gas, the eccentric pin shaft is reinstalled, and the falling of the blast furnace top distribution chute can be prevented.

Description

Technical Field

[0001] The present application relates to the technical field of metallurgical industry equipment, and in particular to a wrapping tape and method for preventing a blast furnace top distribution chute from falling off. Background Art

[0002] The blast furnace's top charging chute is a critical piece of equipment. The goose-head charging chute used at the factory repeatedly encountered this situation. When the blast furnace encountered unusual conditions, such as high top temperatures and internal piping, the eccentric pin of the charging chute was subjected to high temperatures, weakening its mechanical properties. Furthermore, the high-pressure airflow from the pipes within the furnace impacted the chute, causing the eccentric pin to shear. This caused the charging chute to fall off and into the furnace, forcing the blast furnace to shut down.

[0003] Therefore, it is urgent to provide a device and method for preventing the blast furnace top distribution chute from falling off, so as to reduce economic losses and prevent the occurrence of safety accidents. Summary of the Invention

[0004] The present application provides a wrapping tape and method for preventing a blast furnace top distribution chute from falling off, so as to solve the technical problem of the existing blast furnace top distribution chute falling off.

[0005] In the first aspect, the present application provides a wrapping belt for preventing the blast furnace top distribution chute from falling off, the wrapping belt includes a belt body, both ends of the belt body are provided with mounting holes, the thickness of the belt body is 6 to 8 mm, and the width of the belt body is ≥34 mm.

[0006] Furthermore, the thickness of the belt body is 6 mm.

[0007] Furthermore, the width of the belt body is 50-100 mm.

[0008] Furthermore, the belt body is made of a material with a yield strength greater than 56 MPa.

[0009] Furthermore, the widths of both ends of the belt body are greater than the width of the middle portion of the belt body.

[0010] Furthermore, when the wrapping belt is installed on the combination of the goose tray and the cloth chute, the mounting hole is located at the throat of the goose tray.

[0011] In a second aspect, an embodiment of the present application provides a method for preventing a blast furnace top distribution chute from falling off, the method comprising the following steps:

[0012] Obtaining the strapping material according to any one of the first aspects;

[0013] The wrapping belt is installed on the material chute.

[0014] Furthermore, the step of installing the strap on the material distribution chute includes:

[0015] Drill holes in the material distribution chute to obtain a material distribution chute with screw holes

[0016] The wrapping belt is fixed to the material distribution chute having screw holes by means of bolts.

[0017] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0018] The wrapping belt provided in this application is pre-installed on the gear box tilting shaft goose plate. During normal production, it does not affect the goose plate and the distribution chute. After the eccentric pin shaft is cut off, when the distribution chute tilts below 20.32°, the distribution chute can be pulled to prevent it from separating from the goose plate, so that it can still work until the next maintenance cycle, when a large square hole is opened on the furnace top to drive out the gas and the eccentric pin shaft is reinstalled to prevent the distribution chute on the blast furnace top from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is a schematic diagram of one side of the goose tray and chute goose head provided in an embodiment of the present application after installation.

[0022] Figure 2 This is a schematic diagram of the position of the center of mass of the material distribution chute provided in an embodiment of the present application at 20.32°.

[0023] Figure 3 This is a schematic diagram of the strap and bolts provided in an embodiment of the present application (unformed state).

[0024] Figure 4 This is a schematic diagram of the strapping provided in an embodiment of the present application installed on a goose tray and a cloth chute.

[0025] Figure 5 This is the wrapping tape provided in the embodiment of the present application before it is formed.

[0026] Figure 6 The strap provided in the embodiment of the present application is bent and formed.

[0027] Among them, 1-gearbox goose disc, 2-material chute, 3-eccentric pin, 4-belt, 5-bolt. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0030] In the first aspect, the present application provides a wrapping belt for preventing the blast furnace top distribution chute from falling off, the wrapping belt includes a belt body, both ends of the belt body are provided with mounting holes, the thickness of the belt body is 6 to 8 mm, and the width of the belt body is ≥34 mm.

[0031] The material chute is installed on the two tilting shaft goose discs of the furnace top gear box through the goose heads on both sides, and then the eccentric pin is inserted into the tilting shaft (such as Figure 1 ) to prevent the tilt angle from being below 20.32° (such as Figure 2 ) and the distribution chute falls off. During normal production, the goose disc drives the distribution chute, with no relative motion between the distribution chute and the goose disc. When the tilting angle is less than 20.32 degrees, the distribution chute begins to tend to escape from the goose disc, at which point the eccentric shaft begins to generate a locking force. When the tilting angle exceeds 20.32 degrees, the distribution chute is supported by the goose disc, and the eccentric shaft is almost unaffected by the chute's force. Under abnormal furnace conditions, the distribution chute may be lifted by the impact airflow formed by the furnace pipes, causing the distribution chute to move in an arc around the center of the gearbox goose disc 1, moving relative to the goose disc and cutting the eccentric pin.

[0032] The strap provided by this application is pre-installed on the gearbox tilting shaft goose disc. During normal production, it does not affect the goose disc and the distribution chute. After the eccentric pin is cut off, when the distribution chute tilts below 20.32°, the distribution chute can be pulled to prevent it from falling off the goose disc, so that it can still work until the next maintenance cycle, when a large square hole is opened on the furnace top to drive out the gas and the eccentric pin is reinstalled to prevent the distribution chute on the blast furnace top from falling off. According to practical experience, the blast furnace needs to be shut down for at least 6 hours to replace the distribution chute on the furnace top. This application takes advantage of the blast furnace maintenance opportunity to install the strap on the goose head. Even if the eccentric pin is cut off under special furnace conditions, the distribution chute will not fall off, and the benefits are considerable.

[0033] like Figure 1As shown, the material distribution chute is installed on the goose pan. Since the wrapping belt is added on the on-site equipment, in addition to considering the size of the material distribution chute and the goose pan, it is also necessary to consider the installation space (i.e. the gap between the central throat and the goose pan, the gap between the goose pan and the gearbox rotating body), and the weak parts of the wrapping belt. In summary, this application provides the above-mentioned wrapping belt, which is designed as follows Figure 3 The strap shown is installed as Figure 4 shown.

[0034] As an implementation of the embodiment of the present application, the thickness of the belt body is 6 mm.

[0035] Preferably, the thickness of the belt body is 6 mm.

[0036] As an implementation method of the embodiment of the present application, the width of the belt body is 50 to 100 mm.

[0037] Preferably, the width of the belt is 50-100 mm.

[0038] As an implementation method of the embodiment of the present application, the belt body is made of a material with a yield strength greater than 56 MPa.

[0039] When designing the strength of the strap, assuming that the blast furnace encounters special furnace conditions, the eccentric pin is cut off, and the chute tilting angle is less than 20.32°, the following factors should be considered in the strap force calculation:

[0040] (1) The tension of the chute is 7.3 tons.

[0041] (2) The discharge of material from the furnace top tank has an impact on the chute.

[0042] When the material tank is discharged, 90 tons of ore is discharged in about 110 seconds, and 90*1000÷110=820kg of ore impacts the chute every second. According to the height of the discharge gate from the head of the material chute, which is about 6 meters, the gravitational potential energy is converted into kinetic energy. Take V1 = 0m / s, calculate V2 = 11m / s, the material flow impacts the chute, the speed drops from V2 to V3, according to the principle of maximum impact force, take V3 = 0m / s, the impact time t = 0.5 seconds, according to the momentum theorem F 击 t=M(V2-V3), calculated impact force Fimp=18040N;

[0043] (3) The strap size is 6mm thick, and the weakest part of the strap is next to the strap bolt hole (such as Figure 3 ), width 34mm, the tensile stress is calculated as follows:

[0044]

[0045] Therefore, taking into account the special furnace conditions when the wrapping is in effect, the temperature is considered to be 500 degrees for one hour, and the material with a yield strength greater than 56MPa at this temperature is selected.

[0046] As an implementation manner of an embodiment of the present application, the width of both ends of the belt body is greater than the width of the middle portion of the belt body.

[0047] like Figure 4 As shown, the width of the two ends of the belt body is greater than the width of the middle part of the belt body.

[0048] As an implementation method of an embodiment of the present application, when the wrapping belt is installed on the combination of the goose tray and the cloth chute, the mounting hole is located at the throat of the goose tray.

[0049] like Figure 6 As shown, when the wrapping belt is installed on the combination of the goose tray and the cloth chute, the mounting hole is located at the throat of the goose tray.

[0050] In a second aspect, an embodiment of the present application provides a method for preventing a blast furnace top distribution chute from falling off, the method comprising the following steps:

[0051] Obtaining the strapping material according to any one of the first aspects;

[0052] The wrapping belt is installed on the material chute.

[0053] The method for preventing the blast furnace top distribution chute from falling off is implemented based on the wrapping belt described in the first aspect above, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0054] As an implementation method of the embodiment of the present application, the step of installing the strap on the material distribution chute includes:

[0055] Drill holes in the material distribution chute to obtain a material distribution chute with screw holes

[0056] The wrapping belt is fixed to the material distribution chute having screw holes by means of bolts.

[0057] In some specific embodiments, the above implementation process includes the following steps:

[0058] Step 1: According to Figure 4 Schematic diagram, draw the dimensions of each section of the 6mm thick tape Figure 5 shown.

[0059] Step 2: According to Figure 5 Size, cutting as Figure 3 Materials shown.

[0060] Step 3: Place the bag on the Figure 4 or Figure 5 The template is used to make the formed strap.

[0061] Step 4: ① Install on the old chute. Stop the blast furnace, open a large square hole on the top of the furnace to drive out the gas, remove the distribution chute, and Figure 5 Drill four M30*70 holes in the positioning position;② Install the new chute. Drill holes in the new material chute to be replaced in advance, and install the new chute after removing the old one.

[0062] Step 5: Replace the fabric chute and put the tape in place.

[0063] Step 6: Carry out a comprehensive test run of the material distribution chute, including the oiling angle of the impact pump and each material distribution angle, to ensure there is no friction or abnormality.

[0064] The present application will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present application only and are not intended to limit the scope of the present application. The experimental methods in the following examples where specific conditions are not specified are usually measured in accordance with national standards. If there are no corresponding national standards, then the methods are carried out in accordance with general international standards, conventional conditions, or according to the conditions recommended by the manufacturer.

[0065] Example 1

[0066] This example provides a method for preventing a blast furnace top distribution chute from falling off, the method using a wrapping tape to prevent the blast furnace top distribution chute from falling off, specifically comprising the following steps:

[0067] Step 1: According to Figure 4 Schematic diagram, draw the dimensions of each section of the 6mm thick tape Figure 5 shown.

[0068] Step 2: According to Figure 5 Size, cutting as Figure 3 Materials shown.

[0069] Step 3: Place the bag on the Figure 4 or Figure 5 The template is used to make the formed strap.

[0070] Step 4: ① Install on the old chute. Stop the blast furnace, open a large square hole on the top of the furnace to drive out the gas, remove the distribution chute, and Figure 5 Drill four M30*70 holes in the positioning position;② Install the new chute. Drill holes in the new material chute to be replaced in advance, and install the new chute after removing the old one.

[0071] Step 5: Replace the fabric chute and put the tape in place.

[0072] Step 6: Carry out a comprehensive test run of the material distribution chute, including the oiling angle of the impact pump and each material distribution angle, to ensure there is no friction or abnormality.

[0073] According to practical experience, the blast furnace needs to be shut down for at least 6 hours when the distribution chute on the furnace roof is replaced. This application takes advantage of the blast furnace maintenance opportunity. After installing the wrapping tape on the goose head, even if the eccentric pin shaft is cut off under special furnace conditions, the distribution chute will not fall off, which is a considerable benefit.

[0074] To sum up, the wrapping belt provided in this application is pre-installed on the gear box tilting shaft goose plate. During normal production, it does not affect the goose plate and the distribution chute. After the eccentric pin shaft is cut off, when the distribution chute tilts below 20.32°, the distribution chute can be pulled so that it does not separate from the goose plate, so that it can still work until the next maintenance cycle, when a large square hole is opened on the furnace top to drive out the gas and the eccentric pin shaft is reinstalled to prevent the distribution chute on the blast furnace top from falling off.

[0075] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be understood as a hard limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numbers within the range. For example, the description of a range from 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which applies regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0076] In this application, unless otherwise specified, the directional words used, such as "upper" and "lower", refer specifically to the directions of the drawings in the accompanying drawings. In addition, in the description of the present application specification, the terms "including", "comprising", etc. mean "including but not limited to". In this article, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. Wherein A and B can be singular or plural. In this article, "at least one" refers to one or more, and "plurality" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple, respectively.

[0077] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. 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 present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A method for preventing a blast furnace top distribution chute from falling off, characterized in that: The method includes the following steps: obtaining a wrapping belt; the wrapping belt includes a belt body, and mounting holes are provided at both ends of the belt body, the thickness of the belt body is 6-8 mm, and the width of the belt body is 50-100 mm; the belt body is made of a material with a yield strength greater than 56 MPa; the width of the two ends of the belt body is greater than the width of the middle part of the belt body; when the wrapping belt is installed on the combination of the goose tray and the cloth chute, the mounting holes are located at the throat of the goose tray.

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