A roller replacement method for the direct-fired section of a horizontal annealing furnace

Abstract

The present invention discloses a roller changing method for a direct-fired section of a horizontal annealing furnace, relates to the technical field of horizontal annealing furnaces, and solves the problems of long operation time and jamming of rollers and sinking strip steel when replacing furnace rollers in a direct-fired furnace. The method comprises stopping the vehicle for cooling; connecting a roller changing tool to the drive side shaft end of the furnace roller to be removed and synchronously moving it to the operation side until the furnace roller to be removed is moved out of the furnace and the roller changing tool is inserted into the furnace; connecting the roller changing tool to the drive side shaft end of the furnace roller to be installed and synchronously moving it to the drive side, and controlling the roller changing tool so that the protrusion lifts the strip steel in the annealing furnace until the furnace roller to be installed moves into place. The roller changing tool has the advantages of simple structure, convenient implementation and low cost. This scheme can realize the rapid replacement of furnace rollers without jamming, solves the jamming problem of sinking strip steel and new rollers, and the operator can complete the roller changing work without entering the furnace. The parking time and the number of times the furnace cover is opened are reduced as a whole, and the normal production of the production line is guaranteed, which has economic value.

Description

Technical Field

[0001] The invention relates to the technical field of horizontal annealing furnaces, and in particular to a roller replacement method for a direct-burning section of a horizontal annealing furnace. Background Art

[0002] In the hot-dip galvanizing production line, the temperature of the direct-fired section is as high as 1325°C, and the furnace rollers have a short service life. The furnace rollers in the direct-fired section need to be replaced several times a year. During the replacement process, the strip will sink when the rollers are pulled out.

[0003] If manual operation is adopted, each time the furnace rolls are replaced, the furnace needs to be stopped, the furnace cover opened, and people need to enter the furnace to lift the strip to pass through the rolls. However, the furnace cooling time is relatively long, and it takes about 24 hours from the time the furnace is stopped to the time when people can enter the furnace. If the furnace cover is not opened for online replacement, the rollers and the sinking strip are blocked when installing the new rollers, making installation difficult. Summary of the invention

[0004] The present application provides a roller replacement method for a direct-fired section of a horizontal annealing furnace to solve the above technical problems.

[0005] The present application provides a roll changing method for a direct-fired section of a horizontal annealing furnace, which adopts a roll changing tool, wherein the roll changing tool comprises a tube body and a protrusion installed on the outer wall of the tube body; the roll changing method comprises: stopping the annealing furnace to cool down; after stopping and cooling down, connecting the roll changing tool with the drive side shaft end of the furnace roller to be removed, and the roll changing tool and the furnace roller to be removed are synchronously moved toward the operation side until the furnace roller to be removed is moved out of the furnace chamber of the annealing furnace and the roll changing tool is inserted into the furnace chamber, and the connection between the roll changing tool and the furnace roller to be removed is released; after the connection between the roll changing tool and the furnace roller to be removed is released, connecting the roll changing tool with the drive side shaft end of the furnace roller to be installed, and the roll changing tool and the furnace roller to be installed are synchronously moved toward the drive side, and the protrusion is controlled to lift the strip steel in the annealing furnace until the roll changing tool is moved out of the furnace chamber and the furnace roller to be installed is moved into place.

[0006] Optionally, the roller changing tool includes a tube body, a protrusion and a limiting mechanism connected to the tube body, the limiting mechanism being used for limiting connection between the tube body and the driving side shaft end of the furnace roller to be removed or the driving side shaft end of the furnace roller to be installed.

[0007] Optionally, the limiting mechanism includes:

[0008] A nut fixedly connected to the pipe body, with a screw hole of the nut penetrating through the pipe wall of the pipe body; and

[0009] The limiting bolt is threadedly connected with the nut, and the limiting bolt is used to tighten the driving side shaft end of the furnace roller to be removed or the driving side shaft end of the furnace roller to be installed.

[0010] Optionally, the protrusions include:

[0011] A platform body, the bottom end of which is connected to the outer wall of the tube body; and

[0012] Hemisphere, the bottom surface of the hemisphere is welded to the top of the platform.

[0013] Optionally, when the roller changing tool is connected to the furnace roller to be removed, the distance between the furnace roller axis of the furnace roller to be removed and the end of the protrusion away from the tube body is:

[0014] is larger than the radius of the furnace roller to be removed; and

[0015] Smaller than the hole radius of the refractory material on the annealing furnace wall at the furnace roller.

[0016] Optionally, the tube body includes a first tube portion and an extension rod threadedly connected to the first tube portion, and the protrusion and the limiting mechanism are both connected to the first tube portion.

[0017] Optionally, the extension rod is configured in a tubular shape; the tube body also includes a pair of threads, one end of the first tube portion is fixedly connected to the pair of threads, and the pair of threads is threadedly connected to the extension rod, so as to realize the threaded connection between the first tube portion and the extension rod through the pair of threads.

[0018] Optionally, parking and cooling also includes adjusting the furnace pressure of the annealing furnace to atmospheric pressure.

[0019] Optionally, parking and cooling also includes: closing the gas and hydrogen safety keys after parking, locking the gas and hydrogen blind plates, and reducing the temperature of the annealing furnace to below 300°C.

[0020] Optionally, the roller changing method also includes: reinstalling the bearing seat, rotary joint and motor, quickly purging and evenly heating the furnace, passing coal gas and hydrogen, and returning the car to start the vehicle after reinstallation and debugging are completed.

[0021] The beneficial effects of the present application are as follows: a roller changing method for a direct-fired section of a horizontal annealing furnace is provided, including sequentially stopping the machine for cooling, removing old rollers and installing new rollers, wherein a roller changing tool is used for both removing old rollers and installing new rollers, wherein the roller changing tool is first placed on the driving side of the production line, the roller changing tool is connected to the furnace roller to be removed and synchronously moved to the operating side, and the furnace roller to be removed is removed from the annealing furnace, at which time the roller changing tool is placed at the installation position of the furnace roller in the furnace, the roller changing tool and the old roller are disassembled, the roller changing tool is connected to the furnace roller to be installed on the operating side, and synchronously moved to the driving side until the roller changing tool is moved out of the furnace and the furnace roller to be installed is removed. The rollers are moved into place, and during this period, the roller changing tool is rotated to adjust the protrusions upward so that the protrusions lift the strip in the furnace, solving the problem of the furnace rollers and the strip being stuck when the furnace rollers move axially. The roller changing tool involved in this scheme has the advantages of simple structure, convenient implementation and low cost. This scheme can realize the rapid replacement of furnace rollers without obstruction, solving the problem of the obstruction between the sinking strip and the new rollers. The operator can complete the roller changing work without entering the furnace, which reduces the parking time and the number of times the furnace cover is opened as a whole, ensures the normal production of the production line, has economic value, and has reference significance for the roller changing work of other direct-fired furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0023] Figure 1 A schematic diagram of a roll changing tool and a furnace roll in a roll changing method of a direct-fired section of a horizontal annealing furnace provided in the present application;

[0024] Figure 2 for Figure 1 Schematic diagram of the specific structure of the roller changing tool;

[0025] Figure 3 A schematic diagram of the general process of a roller changing method for a direct-fired section of a horizontal annealing furnace provided in the present application.

[0026] The accompanying drawings are marked with: 10-roller changing tool, 100-tube body, 110-first tube part, 120-pair wire, 130-extension rod, 200-protrusion, 210-platform, 220-hemisphere, 300-limiting mechanism, 310-nut, 320-limiting bolt, 20-furnace roller, 21-retaining ring, 30-strip steel, 40-furnace wall refractory material. DETAILED DESCRIPTION

[0027] The embodiment of the present application provides a roller replacement method for the direct-fired section of a horizontal annealing furnace, thereby solving the technical problems in the related art of long operation time and jamming of the rollers and the sinking strip when replacing furnace rollers in a direct-fired furnace.

[0028] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0029] A roll changing method for a direct-fired section of a horizontal annealing furnace adopts a roll changing tool, wherein the roll changing tool comprises a tube body and a protrusion installed on the outer wall of the tube body; the roll changing method comprises: stopping the annealing furnace to cool down; after stopping and cooling down, connecting the roll changing tool with the drive side shaft end of a furnace roller to be removed, and synchronously moving the roll changing tool and the furnace roller to be removed toward an operating side until the furnace roller to be removed is moved out of the furnace chamber of the annealing furnace and the roll changing tool is inserted into the furnace chamber, and the connection between the roll changing tool and the furnace roller to be removed is released; after releasing the connection between the roll changing tool and the furnace roller to be removed, connecting the roll changing tool with the drive side shaft end of the furnace roller to be installed, and synchronously moving the roll changing tool and the furnace roller to be installed toward the drive side, and controlling the protrusion to lift up the strip steel in the annealing furnace until the roll changing tool is moved out of the furnace chamber and the furnace roller to be installed is moved into place.

[0030] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] The present embodiment provides a roll changing method for a direct-fired section of a horizontal annealing furnace, which applies a roll changing tool 10 to solve the problem of the sinking strip steel 30 being stuck with the rolls, and realizes online replacement of the furnace rolls 20 of the direct-fired section.

[0032] The operating side and the driving side are explained here, which are the left and right sides of the production line respectively. The driving side shaft end of the furnace roller 20 mentioned below is specifically the shaft end of the furnace roller 20 located on the driving side of the production line after installation. The operating side and the driving side mentioned below are based on the production line.

[0033] For roller changing tool 10, please refer to Figure 2 , comprising a tube body 100 and a protrusion 200 mounted on the outer wall of the tube body 100; Figure 1 The roll changing tool 10 is connected to the furnace roller 20. In this state, the roll changing tool 10 can also rotate relative to the furnace roller 20 to adjust the height position of the protrusion 200, so as to solve the problem of the sinking strip 30 being stuck with the roller through the protrusion 200.

[0034] Please refer to Figure 3 The roller replacement method of the direct-fired section of the horizontal annealing furnace provided in this embodiment includes sequentially stopping the machine for cooling down, removing the old rollers, installing new rollers, and reinstalling and debugging.

[0035] The first step is to stop the machine and cool down. When changing the rollers, the annealing furnace needs to be stopped and the temperature inside the furnace needs to be lowered, including turning off the gas and hydrogen safety buttons; controlling the furnace pressure by adjusting the exhaust fan speed to achieve rapid cooling; and blocking the gas and hydrogen blind plates.

[0036] During the shutdown and cooling process, the furnace pressure of the annealing furnace can be optionally adjusted to the atmospheric pressure, or slightly lower than the atmospheric pressure. The pressure referred to here is described in terms of relative pressure, i.e. gauge pressure, which is based on the atmospheric pressure as zero. Therefore, the pressure gauge reflecting the furnace pressure of the annealing furnace is adjusted to 0 Pa or 0 to -10 Pa. This can effectively prevent the overflow of hot air in the furnace during operation and improve the problem of burns to personnel caused by the overflow of hot air during roller changing.

[0037] During the shutdown and cooling process, the furnace temperature can be lowered to 300℃. It takes about 10 hours to lower the temperature from 1300℃ to 300℃, and then the power is turned off and the tag is removed. Since this method adopts the online replacement method and improves the problem of hot gas overflow, the processing time has been solved at the beginning stage of waiting for the furnace temperature to drop.

[0038] After stopping and cooling, the step of removing the old roller is carried out. The old roller can be described as the furnace roller to be removed. In this step, the above-mentioned roller changing tool 10 is involved. Specifically, the roller changing tool 10 is placed on the driving side of the production line, and the roller changing tool 10 is connected to the driving side shaft end of the furnace roller to be removed, so that the roller changing tool 10 is driven to move synchronously when the furnace roller 20 moves along the axis. Specifically, from the operating side, the old roller is pulled out from the operating side until the furnace roller to be removed is moved out of the furnace of the annealing furnace, until the roller changing tool 10 replaces the original position of the old roller and is inserted into the furnace, and the roller changing tool 10 holds up the strip steel 30 in the annealing furnace to prevent the strip steel 30 from sinking.

[0039] After the roll changing tool 10 is moved into position, the connection between the roll changing tool 10 and the furnace roll to be removed is released, so as to prepare for the subsequent connection between the roll changing tool 10 and the furnace roll to be installed.

[0040] After removing the old roller, a new roller is installed. The new roller can be described as a furnace roller to be installed. Specifically, the roller changing tool 10 is connected to the drive side shaft end of the furnace roller to be installed, and the roller changing tool 10 and the furnace roller to be installed move synchronously toward the drive side until the roller changing tool 10 moves out of the furnace and the furnace roller to be installed moves into place.

[0041] It should be noted that the connection between the roll changing tool 10 and the furnace roll to be installed is not a fixed connection, and the roll changing tool 10 needs to be rotated during this period to adjust the position of the protrusion 200 in the roll changing tool 10. Specifically, the roll changing tool 10 moves synchronously with the furnace roll to be installed. Figure 1 When the retaining ring 21 shown in the figure is stuck with the strip steel 30 (or before it is stuck), the roll changing tool 10 is rotated, the protrusion 200 is adjusted to face upward, the strip steel 30 is lifted up with the help of the protrusion 200, and then the roll changing tool 10 is continued to be moved, and the installed furnace roller is smoothly inserted into the furnace, and finally the operation of the roller passing through the strip steel 30 is completed.

[0042] In summary, the roll changing tool 10 involved in the present scheme has the advantages of simple structure, easy implementation and low cost. The present scheme can realize the rapid replacement of the furnace roll 20 without jamming, and solves the jamming problem between the sinking strip 30 and the new roll. The operator can complete the roll changing work without entering the furnace, which reduces the parking time and the number of times the furnace cover is opened as a whole, ensures the normal production of the production line, has economic value, and is of reference significance for the roll changing work of other direct-fired furnaces.

[0043] Optional, please refer to Figure 1 and Figure 2 The roller changing tool 10 includes a tube body 100, a protrusion 200 and a limiting mechanism 300 connected to the tube body 100, and the limiting mechanism 300 is used for limiting the connection between the tube body 100 and the driving side shaft end of the furnace roller to be removed or the driving side shaft end of the furnace roller to be installed.

[0044] Optional, please refer to Figure 1 and Figure 2 The limiting mechanism 300 includes a nut 310 and a limiting bolt 320. The nut 310 is fixedly connected to the tube body 100, and the screw hole of the nut 310 penetrates the tube wall of the tube body 100. The limiting bolt 320 is threadedly connected to the nut 310. The limiting bolt 320 is used to tighten the drive side shaft end of the furnace roller to be removed or the drive side shaft end of the furnace roller to be installed. The nut 310 and the limiting bolt 320 cooperate to realize the limiting connection between the furnace roller 20 and the roller changing tool 10 without affecting the rotation operation of the roller changing tool 10, so as to smoothly adjust the position of the protrusion 200.

[0045] Optional, see Figure 2 The protrusion 200 includes a platform 210 and a hemisphere 220. The platform 210 can be set in a truncated cone shape. The bottom end of the platform 210 is connected to the outer wall of the tube body 100, and the bottom surface of the hemisphere 220 is welded to the top of the platform 210. The hemisphere 220 provides a contact surface with the strip steel 30 when the protrusion 200 lifts the strip steel 30. The smooth spherical surface is conducive to the cooperation between the protrusion 200 and the strip steel 30 during operation.

[0046] Optional, please refer to Figure 1 and Figure 2 When the roller changing tool 10 is connected to the furnace roller to be removed, the distance between the axis of the furnace roller 20 of the furnace roller to be removed and the end of the protrusion 200 away from the tube body 100 is greater than the radius of the furnace roller to be removed, so that when the protrusion 200 lifts the strip steel 30, the retaining ring 21 of the furnace roller 20 can smoothly pass under the strip steel 30; the distance is also limited to be smaller than the hole radius of the furnace wall refractory 40 of the annealing furnace at the furnace roller 20, so that the roller changing tool 10 and the furnace roller 20 can be connected as shown in FIG. Figure 1 When the limit connection is shown, the roller changing tool 10 can smoothly enter and exit the furnace.

[0047] Considering the narrow space on the drive side of the production line, please refer to Figure 2 The tube body 100 includes a first tube portion 110 and an extension rod 130 threadedly connected to the first tube portion 110, and the protrusion 200 and the limiting mechanism 300 are both connected to the first tube portion 110. When removing the old roller, the first tube portion 110 is first connected to the old roller, and after the first tube portion 110 is pushed into the furnace for a distance, the extension rod 130 is installed, thereby meeting the requirements of narrow space and the requirement that the roller changing tool 10 can pass through the furnace.

[0048] Accordingly, when installing a new roll, while the roll changing tool 10 and the new roll are moving synchronously toward the driving side, the extension rod 130 of the roll changing tool 10 extends out of the furnace. Before the roll changing tool 10 interferes with the driving side equipment, the extension rod 130 is removed and then continues to move until the new roll passes under the strip 30.

[0049] Optional, see Figure 2, the extension rod 130 is arranged in a tubular shape; the tube body 100 also includes a thread 120, one end of the first tube portion 110 is fixedly connected to the thread 120, and the thread 120 is threadedly connected to the extension rod 130, so as to realize the threaded connection between the first tube portion 110 and the extension rod 130 through the thread 120.

[0050] Alternatively, if Figure 2 As shown, the first pipe portion 110 is composed of a pipe section and an inner buckle tee welded to the pipe section. This solution is characterized in that the material selection is arbitrary.

[0051] The above-mentioned reinstallation and debugging specifically include installing the bearing seat, rotating joint, motor, etc., and then quickly purging the furnace, heating and evenly heating the furnace, passing gas and hydrogen, etc. After the reinstallation and debugging is completed, the vehicle is started.

[0052] By adopting the roll changing method of the direct-fired section of the horizontal annealing furnace of this embodiment, each roll changing can save about 10 hours of time, thereby improving productivity by saving roll changing time and having great economic value.

[0053] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0054] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A roller replacement method for a direct-fired section of a horizontal annealing furnace, characterized in that: A roller changing tool is used, the roller changing tool comprises a tube body and a protrusion mounted on the outer wall of the tube body; the roller changing method comprises: Stopping the annealing furnace and cooling it down; After the shutdown and cooling, the roll changing tool is connected to the drive side shaft end of the furnace roll to be removed, and the roll changing tool and the furnace roll to be removed are synchronously moved toward the operation side until the furnace roll to be removed is moved out of the furnace of the annealing furnace and the roll changing tool is inserted into the furnace, and the connection between the roll changing tool and the furnace roll to be removed is released; After releasing the connection between the roll changing tool and the furnace roll to be removed, the roll changing tool is connected to the drive side shaft end of the furnace roll to be installed, the roll changing tool and the furnace roll to be installed move synchronously toward the drive side, and the protrusion is controlled to lift the strip in the annealing furnace until the roll changing tool moves out of the furnace and the furnace roll to be installed moves into place.

2. The roller changing method according to claim 1, characterized in that: The roller changing tool includes the tube body, the protrusion and a limiting mechanism connected to the tube body, and the limiting mechanism is used for limiting the connection between the tube body and the driving side shaft end of the furnace roller to be removed or the driving side shaft end of the furnace roller to be installed.

3. The roller changing method according to claim 2, characterized in that: The limiting mechanism includes a nut and a limiting bolt, the nut is fixedly connected to the tube body, and the screw hole of the nut passes through the tube wall of the tube body, the limiting bolt is threadedly connected to the nut, and the limiting bolt is used to tighten the driving side shaft end of the furnace roller to be removed or the driving side shaft end of the furnace roller to be installed.

4. The roller changing method according to claim 2, characterized in that: The protrusion comprises a platform and a hemisphere, the bottom end of the platform is connected to the outer wall of the tube body, and the bottom surface of the hemisphere is welded to the top end of the platform.

5. The roller changing method according to claim 4, characterized in that: When the roller changing tool is connected to the furnace roller to be removed, the distance between the furnace roller axis of the furnace roller to be removed and the end of the protrusion away from the tube body is greater than the radius of the furnace roller to be removed and smaller than the hole radius of the furnace wall refractory material of the annealing furnace at the furnace roller.

6. The roller changing method according to any one of claims 2 to 5, characterized in that: The tube body comprises a first tube portion and an extension rod threadedly connected to the first tube portion, and the protrusion and the limiting mechanism are both connected to the first tube portion.

7. The roller changing method according to claim 6, characterized in that: The extension rod is arranged in a tubular shape; The tube body also includes a pair of threads, one end of the first tube portion is fixedly connected to the pair of threads, and the pair of threads is threadedly connected to the extension rod, so that the threaded connection between the first tube portion and the extension rod is achieved through the pair of threads.

8. The roller changing method according to claim 1, characterized in that: The parking and cooling also includes adjusting the furnace pressure of the annealing furnace to atmospheric pressure.

9. The roller changing method according to claim 8, characterized in that: The parking cooling also includes: After stopping the machine, the gas and hydrogen safety keys are turned off, the gas and hydrogen blind plates are locked, and the furnace temperature of the annealing furnace is reduced to below 300°C.

10. The roller changing method according to claim 1, characterized in that: The roller changing method further comprises: after the furnace roller to be installed is moved into position: The bearing seat, rotary joint and motor are reinstalled, the furnace is quickly purged and heated evenly, coal gas and hydrogen are passed, and after reinstallation and debugging are completed, the license is returned and the vehicle is started.

Images