Method for quickly replacing bearing of five-point suspension device of converter

Abstract

The invention discloses a quick replacement method for a bearing of a five-point suspension device of a converter. The quick replacement method comprises the following steps: powering off the converter, rotating until a converter mouth faces downwards, fixing the converter, dismantling retaining walls on two sides, and erecting a scaffold around a backing ring; keeping the position of the backing ring horizontal, uniformly dividing the periphery of the converter into four equal parts, and respectively welding a steel plate bracket; a jack is installed below each steel plate support, the jacks are stressed to jack up the furnace body, and four stop blocks are installed and welded between the backing ring and the furnace shell; the original pin shaft is cut into three sections, and the connecting rod and the cut pin shaft are hoisted to a safe place; the new bearings are heated to 100 DEG C, the shaft sleeves are installed, and after all the new bearings are installed, the glands and the baffle rings are installed, and the connecting rod assemblies are hung in; adjusting the position of the converter body by using a jack, driving a new pin shaft, dismounting the scaffold platform, and plugging walls on two sides of the trunnion after converter test run. According to the method, the adjustment amount of the backing ring and the furnace body can be reduced, manpower is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical equipment installation, and in particular to a method for quickly replacing bearings of a five-point suspension device of a converter. Background Art

[0002] The converter suspension device is an important equipment used to support and operate the converter in the metallurgical field. The converter is a furnace used for steelmaking, which removes impurities by blowing oxygen into molten iron to produce high-quality steel. The main function of the converter suspension device is to support the converter, ensure that the furnace body and the support ring are firmly connected, and at the same time, the furnace shell can rotate freely to carry out operations such as charging, oxygen blowing, steel tapping and slag removal.

[0003] Under the action of heat load, the support ring and the furnace shell will be deformed by thermal expansion. The temperature of the furnace shell is higher than that of the drag ring. When thermally expanding, both will be displaced in the radial and axial directions, resulting in additional stress and damaging the bearings of the converter suspension device. Secondly, the converter suspension device operates in a high temperature and dusty environment. If there are problems with the seal of the bearing end cover and the bearing is not lubricated properly under high temperature operation, the bearing is also very easy to be damaged. The furnace body cannot be removed for replacement, and the operating space is often narrow, making the construction work of replacing the bearing extremely difficult.

[0004] Therefore, how to replace the suspension device bearing safely and quickly is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a safe and fast method for quickly replacing the bearings of the five-point suspension device of the converter, which can reduce the adjustment amount of the support ring and the furnace body, reduce labor and improve construction efficiency.

[0006] The present invention provides a method for quickly replacing bearings of a five-point suspension device of a converter, comprising:

[0007] Cut off the power supply of the converter, rotate the converter until the furnace mouth faces downward, fix the converter equipment to prevent the support ring from rotating, remove the retaining walls of the converter trunnions on both sides, and set up a full-height scaffolding platform around the support ring;

[0008] Keep the support ring in a horizontal position, divide the converter evenly into four equal parts, and weld a steel plate bracket at each of the four equal parts of the converter; install a jack at each support ring position under the steel plate bracket, lift the four jacks, so that the jacks are forced to lift the furnace body, and install and weld four stop blocks between the support ring and the furnace shell;

[0009] Cut the original pin into three sections without damaging the connecting rod, and hoist the connecting rod and the cut pin to a safe place;

[0010] Heat the new bearing to 100 degrees and install it into the sleeve. After all new bearings are installed and the gland and retaining ring are installed, hoist the connecting rod assembly into the assembly.

[0011] Use a jack to adjust the position of the furnace body, measure and eliminate the misalignment of the holes, drive in a new pin after it becomes a straight line, remove the scaffolding platform, and seal the walls on both sides of the ear shaft after the converter is tested.

[0012] Furthermore, in some embodiments, the steel plate support is configured as a 300*300 square steel plate, and any side of the square steel plate is beveled.

[0013] Furthermore, in some embodiments, the original pin shaft is cut into three sections, and a 300-type cutting gun is used in conjunction with an 8mm oxygen blowing tube to use a flame destructive method to cut the pin shaft into three sections. The slag is cleaned in time during cutting without damaging the connecting rod.

[0014] Furthermore, in some embodiments, the new bearing is heated to 100 degrees and installed in the shaft sleeve, which specifically includes: using electric heating plates or electromagnetic heaters to be laid around the bearing hole, the temperature is set to no more than 130 degrees, the outside is well insulated, the bearing seat is heated, and the temperature is controlled within 100 degrees. Before installing the new bearing, the expansion of the shaft hole and the irregular deformation of the bearing seat are carefully measured. If the expansion circumferential size is uneven, it is polished in time until it meets the size requirements.

[0015] Furthermore, in some embodiments, when the connecting rod assembly is hoisted in, a temporary slideway is made using the connecting rod.

[0016] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features specifically described below (such as embodiments) can be combined with each other to form a new or preferred technical solution. Due to space limitations, they will not be described one by one here.

[0017] Compared with the prior art, the present invention has the following technical effects:

[0018] The quick replacement method of the present invention can reduce the difficulty of construction work when the bearing is damaged, and can replace the suspension device bearing online safely and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0020] Figure 1 A flow chart showing a method for quickly replacing bearings of a five-point suspension device of a converter according to an embodiment of the present invention.

[0021] Figure 2 A schematic diagram showing the position arrangement of a converter, a support ring, a steel plate support, and a jack according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution, beneficial effects and significant progress of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, all the embodiments described are only partial embodiments of the present invention, not all embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The present invention will be further described below in conjunction with specific implementations. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The phrase appearing in various locations in the specification does not necessarily refer to the same embodiment, nor is it limited to mutually exclusive independent or alternative embodiments. Those skilled in the art should be able to understand that the embodiments herein may be combined with other embodiments without causing structural conflicts.

[0025] In the description of this article, unless otherwise clearly specified and limited, the technical terms "installed", "connected", "connected" and the like should be understood in a broad sense, and can be a movable connection, a fixed connection or an integral connection, or a connection through a certain connector. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0026] In the description of this document, terms indicating orientation or positional relationships, such as "up", "down", "left", "right", "horizontal", "vertical", "height", "length", and "width", are intended to accurately describe the embodiments and simplify the description, but are not intended to limit the parts or structures involved to have a specific orientation, be installed or operate in a specific orientation, and should not be construed as a limitation on the embodiments in this document.

[0027] In the description of this article, the terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating relative importance or limiting the quantity, specific order or primary and secondary relationship of the described technical features. In the description of this article, the meaning of "plurality" is at least two.

[0028] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0029] like Figure 1 to Figure 2As shown, the present application provides a method for quickly replacing bearings of a five-point suspension device of a converter, comprising:

[0030] Step S100: Turn off the power to the converter, rotate the converter until the furnace mouth 4 faces downward, fix the converter equipment to prevent the support ring 3 from rotating, remove the retaining walls of the converter ear shafts on both sides, and set up a full-height scaffolding platform around the support ring. A batch of steel pipe scaffolding and springboards are used to set up the scaffolding platform, and the setting working height is set according to the height position of the converter shell. Specifically, go through the operating procedures first, turn the converter furnace mouth 4 downward, and then fix the converter equipment to prevent the support ring 3 from rotating. Remove the ear shaft retaining walls on both sides to facilitate the working space to meet the construction conditions when replacing the bearings. Set up a full-height scaffolding platform around the support ring to ensure the safety needs of the construction site, cut off the power to the converter body, and put up a sign for safety confirmation.

[0031] Step S200: Keep the support ring in a horizontal position, divide the converter into four equal parts evenly, weld a steel plate bracket 1 at each of the four equal parts of the converter; install a jack 2 at each support ring position below the steel plate bracket 1, lift four jacks 2, so that the jacks 2 are forced to lift the furnace body, and install and weld four stop blocks between the support ring 3 and the furnace shell. The selection of jacks 2 needs to be selected according to the weight of the furnace shell. In one embodiment of the present invention, four 300T hydraulic jacks and supporting facilities are used to lift the furnace body. Specifically, use a total station and a level to measure whether the elevation of the support ring is consistent, and try to ensure that the horizontal elevation is consistent. Divide the converter and the support ring evenly into four parts, and then weld a δ100 steel plate bracket at the four equal parts of the converter, and the bracket is fully welded. Install four jacks below the steel plate bracket, lift the four jacks, and make the jacks bear force. Four stop blocks are installed and welded between the support ring and the furnace shell to prevent deformation caused by excessive gap in the middle after the suspension device is removed.

[0032] Further, in some embodiments, the steel plate support is set as a 300*300 square steel plate, and any side of the square steel plate is grooved. Specifically, a δ100 steel plate is prepared, and four 300*300 square plates are cut from it, and the burrs around the edges are polished clean, and grooves are made on any side of the square blocks.

[0033] Step S300: Cut the original pin into three sections without damaging the connecting rod, and hoist the connecting rod and the cut pin to a safe place; further, in some embodiments, the original pin is cut into three sections, and a 300-type cutting gun is used in conjunction with an 8mm oxygen blowing pipe, and a flame destructive method is used to cut the pin into three sections, and the slag is removed in time during cutting, and the connecting rod is not damaged. A five-ton guide chain is used to match the platform of the car crane above the support ring and the furnace shell to hoist the cut pin and the connecting rod to a safe place. As can be understood by those skilled in the art, the installation of the connecting rod pin of the hanging device belongs to a clearance fit. After production, the site is subject to high temperature and dust factors, normal deformation of the furnace shell and other invisible factors, so it is faster to cut off the pin. When the hanging device is installed, there is a retaining ring between the connecting rod and the support, and there is a certain gap between the support and the connecting rod. A 300-type cutting gun can be used in conjunction with an 8mm oxygen blowing pipe, and a flame destructive method can be used to cut the pin into three sections, and the slag is removed in time during cutting, and the support and the connecting rod cannot be damaged.

[0034] Step S400: The new bearing is heated to about 100 degrees, and the sleeve is installed. After all new bearings are installed, and the gland and retaining ring are installed, the connecting rod assembly is hoisted in;

[0035] Furthermore, in some embodiments, the new bearing is heated to about 100 degrees and installed in the shaft sleeve, which specifically includes: using electric heating plates or electromagnetic heaters to be laid around the bearing hole, the temperature is set to no more than 130 degrees, the outside is well insulated, the bearing seat is heated, and the temperature is controlled within 100 degrees. Before installing the new bearing, the expansion of the shaft hole and the irregular deformation of the bearing seat are carefully measured. If the expansion circumferential size is uneven, it is polished in time until it meets the size requirements.

[0036] Specifically, electric heating sheets are laid around the bearing hole, the temperature is set to no more than 130 degrees, the outside is well insulated, and the bearing seat is slowly heated, and the temperature is controlled within 100 degrees. Before installing the new bearing, carefully measure the expansion of the shaft hole, and pay attention to the irregular deformation of the bearing seat and the uneven expansion circumference. Polish it in time until it meets the size requirements. The key bearing can be driven into the key bearing with a copper rod, and the size of the bearing hole is remeasured after cooling, and the roundness of the hole is noted. As can be understood by those skilled in the art, because the connecting rod bearing and the sleeve are split accessories, electric heating sheets or electromagnetic heaters can be used for heating during on-site assembly. The bearing and the sleeve are interference fit. The bearing is heated to about 100 degrees and installed in the sleeve. Pay attention to the depth of the sleeve and the bearing, otherwise it will affect the movable angle of the connecting rod.

[0037] Furthermore, in some embodiments, when the connecting rod assembly is hoisted in, a temporary slideway is made of the connecting rod. Specifically, after all key bearings are installed, and the gland and retaining ring are installed, the connecting rod assembly is hoisted in, and the horizontal connecting rod can be made into a temporary slideway to facilitate pulling into the working position.

[0038] Step S500: Use a jack to adjust the furnace body position, measure and eliminate the misalignment of the hole, and drive in a new pin after it becomes a straight position. You can use a sledgehammer to knock. If there is a card group, you can use the red lead method to find the hard point, grind it locally and drive it into place, and install related accessories to prevent loosening. Remove the scaffolding platform and seal the walls on both sides of the ear shaft after the converter test run.

[0039] In summary, the method for quickly replacing bearings of a five-point suspension device of a converter of the present invention has the following beneficial effects compared with the prior art:

[0040] 1. Utilize the existing space, use the support ring as the support point, weld the support plate on the furnace shell, and then use the jack to lift the furnace body. Then insert the wedge block into the gap between the furnace shell and the support ring as a fixing device to prevent the circumferential movement after the suspension device is removed.

[0041] Second, this method can reduce the amount of adjustment between the support ring and the furnace body, reduce labor, and improve construction efficiency. At the same time, it can also prevent the furnace shell and the support ring from being affected by the surrounding environment after a long period of operation. Only by ensuring the relative position of the furnace shell and the support ring can the support ring and the furnace shell be adjusted twice.

[0042] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A method for quickly replacing bearings of a converter five-point suspension device, characterized in that: include: Cut off the power supply of the converter, rotate the converter until the furnace mouth faces downward, fix the converter equipment to prevent the support ring from rotating, remove the retaining walls of the converter trunnions on both sides, and set up a full-height scaffolding platform around the support ring; Keep the support ring in a horizontal position, divide the converter evenly into four equal parts, and weld a steel plate bracket at each of the four equal parts of the converter; install a jack at each support ring position under the steel plate bracket, lift the four jacks, so that the jacks are forced to lift the furnace body, and install and weld four stop blocks between the support ring and the furnace shell; Cut the original pin into three sections without damaging the connecting rod, and hoist the connecting rod and the cut pin to a safe place; Heat the new bearing to 100 degrees and install it into the sleeve. After all new bearings are installed and the gland and retaining ring are installed, hoist the connecting rod assembly into the assembly. Use a jack to adjust the position of the furnace body, measure and eliminate the misalignment of the holes, drive in a new pin after it becomes a straight line, remove the scaffolding platform, and seal the walls on both sides of the ear shaft after the converter is tested.

2. The method for quickly replacing the bearing of the converter five-point suspension device according to claim 1 is characterized in that: The steel plate support is configured as a 300*300 square steel plate, and any side of the square steel plate is beveled.

3. The method for quickly replacing the bearing of the converter five-point suspension device according to claim 1 is characterized in that: The original pin shaft is cut into three sections, and a 300-type cutting gun is used in conjunction with an 8mm oxygen blowing tube, and a flame destructive method is used to cut the pin shaft into three sections. During cutting, slag is removed in time to avoid damaging the connecting rod.

4. The method for quickly replacing bearings of a converter five-point suspension device according to claim 1, characterized in that: The new bearing is heated to 100 degrees and installed in the shaft sleeve, which specifically includes: using electric heating plates or electromagnetic heaters to be laid around the bearing hole, the temperature is set to no more than 130 degrees, the outside is well insulated, the bearing seat is heated, and the temperature is controlled within 100 degrees. Before installing the new bearing, carefully measure the expansion of the shaft hole and the irregular deformation of the bearing seat. If the expansion circumferential size is uneven, polish it in time until it meets the size requirements.

5. The method for quickly replacing bearings of a converter five-point suspension device according to claim 1 is characterized in that: When the connecting rod assembly is hoisted in, a temporary slideway is made by utilizing the connecting rod.

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