A disassembly and assembly method for quickly replacing the chain links of a large-scale belt cooler

Abstract

The present invention discloses a disassembly and assembly method for quickly replacing chain links of a large-scale cooler, which relates to the technical field of cooler maintenance. The disassembly and assembly method for quickly replacing chain links of a large-scale cooler according to the present invention includes pre-removing the middle hood and chimney of the cooler → shutting down the machine → removing the upper trolley → removing the upper chain links → reinstalling the new upper chain links and the new upper trolley → replacing the lower chain links and reinstalling the lower trolley → replacing all the remaining chain links and reinstalling the remaining trolleys → reinstalling the hood and carrying out the finishing work → commissioning; two lifting points are respectively arranged at the middle and the tail of the removed middle hood to simultaneously carry out the removal and reinstallation processes of the upper trolleys and chain links of the cooler, so as to improve the replacement speed of the chain links and reduce the production loss during shutdown; after the reinstallation of the upper chain links and the upper trolley is completed, the replacement of the lower and the remaining chain links and the reinstallation of the lower and the remaining trolleys only need to rotate the head wheel twice, which is carried out after rotating the old lower chain links above the cooler, thereby saving the installation time.

Description

Technical Field

[0001] The present invention relates to the technical field of overhaul of cooling machines, and more specifically to a disassembly and assembly method for quickly replacing chain links of a large-scale cooling machine. Background Art

[0002] In metallurgical enterprises, the overall replacement of chain links of large-scale cooling machines with an area of more than 360 square meters generally requires 15 to 20 days of overhaul time. The conventional replacement method is to remove the middle hood and chimney of the cooling machine in advance without stopping production, open a hoisting point for the demolition of the old chain links and the reinstallation of the new chain links until all the chain links are replaced. However, according to the current production mode of two cooling machines for two blast furnaces in the North Area of the Ironmaking General Factory, this construction period cannot guarantee the material balance of normal production of the blast furnace, and the blast furnace will therefore be shut down for maintenance, resulting in relatively large production losses.

[0003] Therefore, there is an urgent need to propose a new overhaul method to shorten the construction period required for replacing the chain links of a large-scale cooling machine through the newly designed overhaul method, thereby minimizing the production losses during the overhaul period. Summary of the Invention

[0004] 1. Technical Problems to be Solved by the Invention

[0005] Aiming at the problems such as long shutdown overhaul time caused by the overall replacement of chain links of large-scale cooling machines in the prior art, the present invention proposes a disassembly and assembly method for quickly replacing chain links of a large-scale cooling machine. Before the start of the main process, the middle hood and chimney of the cooling machine are removed without stopping production, so as not to occupy the main overhaul time. Middle and tail hoisting points are respectively opened at the middle and tail of the removed middle hood, and the disassembly and reinstallation processes of the trolley and chain links on the cooling machine are simultaneously carried out at the two hoisting points. By opening two hoisting points at the middle and tail of the removed middle hood to simultaneously carry out the disassembly and reinstallation of the trolley and chain links, when the upper chain links are completely removed, the upper new trolley and new chain links are immediately reinstalled, and the reinstallation of the chain links and the trolley is carried out synchronously, so as to improve the replacement speed of the chain links, and the replacement efficiency is also significantly improved; the shutdown time is short, and the production losses are reduced.

[0006] 2. Technical Solutions

[0007] To achieve the above object, the technical solution provided by the present invention is as follows:

[0008] A disassembly and assembly method for quickly replacing chain links of a large-scale cooling machine, including removing the middle hood and chimney of the cooling machine before the start of the main process without stopping production, so as not to occupy the main overhaul time; respectively opening a middle hoisting point and a tail hoisting point at the middle and tail of the removed middle hood, and simultaneously carrying out the disassembly and reinstallation processes of the trolley and chain links on the cooling machine at the two hoisting points. By opening two hoisting points at the middle and tail of the removed middle hood to simultaneously carry out the disassembly and reinstallation of the trolley and chain links, when the upper chain links are completely removed, the upper new trolley and new chain links are immediately reinstalled, and the reinstallation of the chain links and the trolley is carried out synchronously, so as to improve the replacement speed of the chain links, and the replacement efficiency is also significantly improved; the shutdown time is short, and the production losses are reduced.

[0009] A further technical solution is that the disassembly and reinstallation of the trolley and chain links specifically include the following steps:

[0010] Step 1: First, remove the connecting bolts between the trolley and the chain link at the middle lifting point and the tail lifting point.

[0011] Step 2: Synchronously start removing the upper trolleys from the middle lifting point and the tail lifting point.

[0012] Step 3: After the upper trolleys are removed, rotate the cooler counterclockwise to turn the lower trolleys to the removed middle hood. Then, repeat the operations in Step 1 and Step 2 simultaneously from the middle lifting point and the tail lifting point until all trolleys are removed.

[0013] Step 4: After the upper trolleys are removed, cut the upper chain link at the engagement of the head wheel and the tail wheel, and cut the upper chain link into sections of 6 - 8 links each. Then, use a winch to drag it to the middle lifting point and the tail lifting point for hoisting and landing for maintenance.

[0014] Further technical solution: In Step 4, both ends of the cut chain link are supported by 16# channel steel every 6 - 8 meters to prevent the chain link from collapsing due to excessive length.

[0015] Further technical solution: In Step 4, the sector plates between every two adjacent trolleys are cut off for every 10 removed trolleys, so as to facilitate the forklift to transport a certain number of removed trolleys to the specified location for stacking.

[0016] Further technical solution: In Step 4, 5T winches are used and 4 winches are symmetrically distributed in the north and south at the middle lifting point and the tail lifting point of the cooler.

[0017] Further technical solution: New chain link placement areas are set outside the winches symmetrically distributed in the north and south. One side of the new chain link placement area outside the winch set in the north of the cooler is close to the position of Middle Sintering Road. An 80T crane is set corresponding to the middle lifting point and the tail lifting point, and the slewing radius of the crane is about 25 meters. A 120T crane is set on one side of the new chain link placement area outside the winch set in the south of the cooler. A 120T auxiliary crane is also set on one side of the north of the cooler, so as to play an auxiliary hoisting role in the north of the cooler.

[0018] Further technical solution: Reinstall the new upper chain link and the new upper trolley. Immediately after the upper chain link is removed, reinstall the new upper trolley and the new upper chain link, and the reinstallation of the chain link and the trolley is carried out synchronously. The specific steps are as follows:

[0019] A1. At the middle lifting point and the tail lifting point, use the 2 80T cranes set in the north of the cooler and the 120T crane in the south to alternately hoist the new chain link and place it on the idler rollers.

[0020] A2. Immediately hoist the new chain link onto the trolley, use the winch to adjust the position of the new chain link to facilitate the installation of the trolley, and leave one chain link without the trolley to facilitate the connection of the next new chain link;

[0021] A3. Use the winch to drag the new chain link loaded on the trolley back to free up space for the next new chain link.

[0022] A4. Repeat step A2 and continue to reinstall the trolley on the new upper chain link until the new upper chain link and the new upper trolley are fully installed, and finally close them in the middle;

[0023] A5. The trolleys are reinstalled using an 80T crane and a 120T crane. Three 10t forklifts are responsible for transporting the trolleys from the trolley stacking point to the installation site. The entire upper trolley 51 reinstallation volume is about 90 units, and the installation process is controlled within 48 hours.

[0024] A further technical solution is that after the new upper chain link and the new upper trolley are reinstalled, the replacement of the lower chain link and the remaining chain links and the reinstallation of the lower trolley and the remaining trolleys require turning the head wheel twice to rotate the lower old chain link to the top of the belt cooler, which specifically includes the following steps:

[0025] B1. Temporarily connect the replaced upper chain link with the old lower chain link at the head wheel and tail wheel using chain link fixing pins (Party A provides 6 slightly thinner temporary chain link fixing pins);

[0026] B2. Rotate the head wheel in reverse direction until the lower 90 old chain links are rotated to the top of the belt cooler and then stop;

[0027] B3. Disconnect the old and new chain links at the head and tail wheels, replace the lower 90 old chain links and reinstall the corresponding trolley. The time should be controlled within about 48 hours.

[0028] B4. Reversely rotate the head wheel again to repeat step B2 to replace the remaining chain links and reinstall the remaining trolleys. The time is controlled within 20 hours.

[0029] A further technical solution is that the mobile trolley with a cold machine includes a head wheel and a tail wheel, the head wheel is driven by an external transmission device, a chain link is arranged between the head wheel and the tail wheel, the chain link is connected head to tail and meshed and sleeved on the transmission shaft between the head wheel and the tail wheel, and a plurality of groups of trolleys are arranged on the chain link at equal vertical intervals.

[0030] A further technical solution is that the chain links include upper chain links and lower chain links, and the upper chain links and the lower chain links are distributed up and down on the upper and lower parts of the horizontal connection line between the head wheel and the tail wheel; the outer ends of the upper chain links and the lower chain links form a ring-shaped chain link connected end to end by externally connecting the remaining chain links; the upper chain links are detachably mounted with an upper trolley, the lower chain links are detachably mounted with a lower trolley, and the remaining chain links are detachably mounted with the remaining trolleys.

[0031] 3. Beneficial effects

[0032] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0033] (1) For the disassembly and assembly method of quickly replacing the chain links of a large-scale cooler, before the main process starts, the middle hood and chimney of the cooler are removed without stopping production during this period, so it does not occupy the main overhaul time; middle hoisting points and tail hoisting points are respectively opened in the middle and the tail of the removed middle hood, and the removal and reinstallation processes of the cooler carriages and chain links are carried out simultaneously at the two hoisting points. Immediately after the upper chain links are removed, the upper new carriages and new chain links are reinstalled, and the reinstallation of the chain links and the carriages is carried out synchronously to improve the replacement speed of the chain links, and the replacement efficiency is also significantly improved; the shutdown time is short, reducing the production stoppage loss;

[0034] (2) For the disassembly and assembly method of quickly replacing the chain links of a large-scale cooler, immediately reinstall the corresponding carriage after installing a new section of chain link. After installing the carriage, manually set up a winch as a whole to pull the chain link and the carriage to the tail and connect them to the tail link, and then install the remaining carriages and drag them to the head and connect them to the head link. In this way, the welding amount of the sector plate and the pressing plate is reduced. This method greatly saves the reinstallation time and does not require rotating the head pulley for the reinstallation operation of the upper chain links and carriages in the early stage;

[0035] (3) For the disassembly and assembly method of quickly replacing the chain links of a large-scale cooler, after the upper chain links and carriages are reinstalled, the replacement of the remaining chain links and the reinstallation of the carriages need to rotate the head pulley twice to rotate the lower old chain links above the cooler and then complete the replacement of the remaining carriages and chain links, saving the installation time;

[0036] (4) For the disassembly and assembly method of quickly replacing the chain links of a large-scale cooler, a 5T winch is used and 4 winches are symmetrically distributed in the north-south direction at the middle hoisting point and the tail hoisting point of the cooler, and a matching pulley block is used for hoisting the manual carriage and chain link. Immediately hoist and reinstall the carriage on the laid new chain link, and use the winch to adjust the position of the new chain link to facilitate the installation of the carriage. Leave 1 chain link without installing the carriage for the connection of the next section of new chain link. Description of the drawings

[0037] Figure 1 It is the transmission schematic diagram of the cooler chain link of the present invention;

[0038] Figure 2 It is the hoisting layout schematic diagram of the cooler chain link of the present invention.

[0039] In the figure: 1 - head wheel; 2 - transmission device; 3 - tail wheel; 4 - chain link; 41 - upper chain link; 42 - lower chain link; 43 - remaining chain link; 5 - trolley; 51 - upper trolley; 52 - lower trolley; 53 - remaining trolley. Detailed implementation mode

[0040] To further understand the content of the present invention, the invention will be described in detail in combination with the accompanying drawings.

[0041] Embodiment 1

[0042] A disassembly and assembly method for quickly replacing the chain links of a large-scale cooling machine with a cooler in this embodiment is as Figure 1 shown, including removing the middle hood and chimney of the cooling machine before the start of the main process without stopping production during this period, so as not to occupy the main overhaul time; respectively opening a middle hoisting point and a tail hoisting point at the middle and tail of the removed middle hood, and simultaneously carrying out the disassembly and reinstallation processes of the upper trolley 5 and the chain link 4 of the cooling machine at the two hoisting points. Two hoisting points are opened at the middle and tail of the removed middle hood to simultaneously carry out the disassembly and reinstallation of the trolley and the chain link. Immediately after the upper chain link 41 is removed, a new upper trolley and a new chain link are reinstalled, and the reinstallation of the chain link and the trolley is carried out synchronously to improve the replacement speed of the chain link, and the replacement efficiency is also significantly improved; the downtime is short, and the production stoppage loss is reduced.

[0043] In this embodiment, the replacement of the chain links 4 of the cooling machine adopts continuous operation for 24 hours, with a shift of 12 hours, and the personnel of two shifts are rotated every day. The main construction steps and methods are as follows:

[0044] Remove the middle hood and chimney of the cooling machine in advance → Stop the machine → Remove the upper trolley 51 → Remove the upper chain link 41 → Reinstall the new upper chain link 41 and the new upper trolley 51 → Replace the lower chain link 42 and reinstall the lower trolley 52 → Replace the remaining chain link 43 and reinstall the remaining trolley 53 → Reinstall the hood and finish the follow-up work → Test run.

[0045] As Figures 1-2 shown, the cooling machine includes a head wheel 1 and a tail wheel 3. The head wheel 1 is driven by an external transmission device 2. A chain link 4 is arranged between the head wheel 1 and the tail wheel 3. The head and tail of the chain link 4 are connected end to end and meshed and sleeved on the transmission shaft between the head wheel 1 and the tail wheel 3. A number of groups of trolleys 5 are arranged vertically and equidistantly on the chain link 4. The chain link 4 includes an upper chain link 41 and a lower chain link 42. The upper chain link 41 and the lower chain link 42 are distributed up and down in the upper and lower parts of the horizontal connection line between the head wheel 1 and the tail wheel 3; the two outer ends of the upper chain link 41 and the lower chain link 42 form a ring-shaped chain link 4 through an external remaining chain link 43; an upper trolley 51 is detachably installed on the upper chain link 41, a lower trolley 52 is detachably installed on the lower chain link 42, and a remaining trolley 53 is detachably installed on the remaining chain link 43.

[0046] Example 2

[0047] A disassembly and assembly method for quickly replacing the chain links of a large-scale cooling machine in this embodiment has the same basic structure as that in Example 1. The differences and improvements are as follows: As Figure 1 shown, the disassembly and reinstallation of the trolley 5 and the chain link 4 specifically include the following steps:

[0048] Step 1: First, remove the connecting bolts between the upper trolley 51 and the upper chain link 41 between the middle hoisting point and the tail hoisting point.

[0049] Step 2: Starting from the middle hoisting point and the tail hoisting point simultaneously, remove the upper trolley 51 installed on the upper chain link 41.

[0050] Step 3: After the upper trolley 51 is removed, rotate the cooling machine counterclockwise to turn the lower trolley 52 installed on the lower chain link 42 to the removed middle hood. Then, repeat the operations in Step 1 and Step 2 from the middle hoisting point and the tail hoisting point simultaneously until all the trolleys are removed.

[0051] Step 4: After all the trolleys 5 are removed, cut the upper chain link 41 at the meshing position of the head wheel 1 and the tail wheel 3, and cut the upper chain link 41 into sections of 6 - 8 links each. Then, use a winch to drag it to the middle hoisting point and the tail hoisting point for hoisting and landing for maintenance.

[0052] In Step 4 of this embodiment, both ends of the cut chain link 4 are supported by 16# channel steel every 6 - 8 meters to prevent the chain link 4 from collapsing due to its excessive length.

[0053] For the removed trolleys 5, cut the sector plates between every two adjacent trolleys 5 every 10 trolleys, so as to facilitate the transportation of a certain number of removed trolleys 5 to the specified location for stacking by forklift.

[0054] Example 3

[0055] A disassembly and assembly method for quickly replacing the chain links of a large-scale cooling machine in this embodiment has the same basic structure as that in Example 2. The differences and improvements are as follows: As Figure 2 shown, a 5T winch is used and 4 winches are symmetrically distributed in the north and south at the middle hoisting point and the tail hoisting point of the cooling machine. New chain link placement areas are set outside the winches symmetrically distributed in the north and south. One side of the new chain link placement area outside the winch set in the north of the cooling machine is close to the middle sintering road position, and an 80T crane is set corresponding to the middle hoisting point and the tail hoisting point, with a slewing radius of about 25 meters for the crane; an 120T crane is set on one side of the new chain link placement area outside the winch set in the south of the cooling machine; a 120T auxiliary crane is also set on one side of the north of the cooling machine, so as to play an auxiliary hoisting role in the north of the cooling machine.

[0056] Example 4

[0057] The present embodiment is a method for quickly replacing a large-scale belt cooling machine chain link. The basic structure is the same as that of the embodiment 3. The difference and improvement are as follows: Figure 1 As shown, the upper chain link 41 and the upper trolley 51 are reinstalled. After the upper chain link 41 is dismantled, the new upper trolley 51 and the new upper chain link 41 are immediately reinstalled, and the reinstallation of the new upper chain link 41 and the new upper trolley 5 is performed simultaneously, which specifically includes the following steps:

[0058] A1. At the middle lifting point and the tail lifting point, use two 80T cranes located in the north of the belt cooler and a 120T crane in the south to alternately lift the new upper chain link 41 and place it on the roller;

[0059] A2. Immediately hoist and reinstall the new upper trolley 51 on the laid new upper chain link 41, use the winch to adjust the position of the new chain link to facilitate the installation of the new upper trolley 51, and leave one chain link without the new upper trolley 51 to facilitate the connection of the new chain link at the lower section;

[0060] A3, use the winch to drag back the new chain link of the new upper trolley 51 to free up space for the next new upper chain link 41;

[0061] A4, repeat step S2, continue to reinstall the new upper trolley 51 on the new upper chain link 41, until the new upper chain link 41 and the new upper trolley 51 are fully installed, and finally close them in the middle;

[0062] A5. The new upper trolley 51 is reinstalled using an 80T crane and a 120T crane. The total number of new upper trolleys 51 reinstalled is about 90, and the installation process is controlled within 48 hours.

[0063] In this example, after a new upper chain link 41 is installed, the corresponding new upper trolley 51 is immediately installed. After 40 new upper trolleys 51 are installed, the new upper chain link 41 and the new upper trolley 51 are pulled to the tail by the overall manual winch and connected to the tail wheel section of the upper chain link 41. Then 50 new upper trolleys 51 are installed and dragged to the head and connected to the head wheel section of the upper chain link 41. This reduces the welding amount of the fan plate and the pressure plate. This method greatly saves the reinstallation time, and the new upper chain link 41 and the new upper trolley 51 in the early stage are also connected. The reinstallation of the upper trolley 51 does not require turning the head wheel 1, and the installation process is controlled within 48 hours; the removal of the entire upper trolley 51 and the upper chain link 41 is planned to be completed within 36 hours; after the reinstallation of the new upper chain link 41 and the new upper trolley 51 is completed, the replacement of the lower chain link 42 and the remaining chain link 43 and the reinstallation of the lower trolley 52 and the remaining trolleys 53 require turning the head wheel 1 twice to rotate the old lower chain link 42 to the top of the belt cooler, and the time is controlled within 68 hours.

[0064] In summary, after adopting the new technical solution, it takes 152 hours, that is, 6 days and 8 hours, to replace the entire link 4. This is 8 days and 4 hours shorter than the conventional maintenance method. The production line downtime is also significantly shortened accordingly, effectively avoiding the shutdown of a blast furnace in the factory and minimizing production losses. Although more maintenance resources are invested compared to the conventional maintenance method, the production losses recovered due to the shortened maintenance time are basically negligible.

[0065] Example 5

[0066] A disassembly and assembly method for quickly replacing the links of a large-scale cooling machine with the basic structure being the same as that of Example 4, the differences and improvements are as follows: As Figure 1 shown, after the new upper link 41 and the new upper trolley 51 are reinstalled, the replacement of the lower link 42 and the remaining links 43 and the reinstallation of the lower trolley 52 and the remaining trolleys 53 require rotating the head pulley 1 twice to rotate the old lower link 42 above the cooling machine before proceeding. The specific steps are as follows:

[0067] B1. Temporarily connect the replaced new upper link 41 and the old lower link 42 at the head pulley 1 and the tail pulley 3 using link fixing pins (6 slightly thinner temporary link fixing pins provided by Party A).

[0068] B2. Reverse-rotate the head pulley 1 until the 90-section old lower link 42 is rotated above the cooling machine and then stop.

[0069] B3. Disconnect the new and old links at the head and tail pulleys 1, replace the 90-section old lower link 42 and reinstall the corresponding lower trolley 52, with the time controlled within about 48 hours.

[0070] B4. Reverse-rotate the head pulley 1 again to repeat step B2 to replace the remaining links 43 and reinstall 42 remaining trolleys 53, with the time controlled within 20 hours.

[0071] The above has schematically described the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, creatively design structural manners and embodiments similar to this technical solution, they shall fall within the protection scope of the present invention.

Claims

1. A disassembly and assembly method for quickly replacing chain links of a large-scale belt cooler, characterized in that: It includes pre-demolishing the middle hood and chimney of the cooler, respectively opening a middle lifting point and a tail lifting point at the middle and the tail of the demolished middle hood, and simultaneously performing the demolition and reinstallation processes of the upper trolley (5) and the chain link (4) of the cooler at the two lifting points; The demolition of the trolley (5) and the chain link (4) specifically includes the following steps: Step 1: First, remove the connecting bolts of the upper trolley (51) and the upper chain link (41) between the middle lifting point and the tail lifting point; Step 2: Synchronously start removing the upper trolley (51) installed on the upper chain link (41) from the middle lifting point and the tail lifting point; Step 3: After the upper trolley (51) is removed, the cooler rotates counterclockwise to turn the lower trolley (52) installed on the lower chain link (42) to the position of the demolished middle hood, and then repeat the operations in Step 1 and Step 2 from the middle lifting point and the tail lifting point simultaneously until all the trolleys are removed; Step 4: After all the trolleys (5) are removed, cut the upper chain link (41) at the meshing position of the head wheel (1) and the tail wheel (3), cut the upper chain link (41) into sections of 6 - 8 sections, and use a winch to drag it to the middle lifting point and the tail lifting point for hoisting and landing for maintenance; In the above Step 4, both ends of the cut chain link (4) are supported by 16# channel steel every 6 - 8 meters; In the above Step 4, for the removed upper trolleys (51), cut the sector plates between every two adjacent upper trolleys (51) every 10 trolleys; In the above Step 4, 5 T winches are used and 4 winches are symmetrically distributed in the north and south at the middle lifting point and the tail lifting point of the cooler; there are new chain link placement areas outside the winches symmetrically distributed in the north and south. On one side of the new chain link placement area outside the winch set in the north of the cooler, it is close to the middle of the sintering road, and 80T cranes are set corresponding to the middle lifting point and the tail lifting point; on one side of the new chain link placement area outside the winch set in the south of the cooler, a 120T crane is set; a 120T auxiliary crane is also set on one side of the north of the cooler; Immediately after the removal of the upper chain link (41) and the upper trolley (51), reinstall the new upper trolley (51) and the new upper chain link (41), and the reinstallation of the new upper chain link (41) and the new upper trolley (51) is carried out synchronously, specifically including the following steps: A1. At the middle lifting point and the tail lifting point, use 2 80T cranes set in the north of the cooler and a 120T crane in the south to alternately hoist the new upper chain link (41) and place it on the idler rollers; A2. Immediately reinstall the new upper trolley (51) on the laid new upper chain link (41), use the winch to adjust the position of the new chain link to facilitate the installation of the new upper trolley (51), and leave 1 chain link without installing the new upper trolley (51) for the connection of the next section of the new chain link; A3. Use the winch to drag the new upper chain link (41) with the new upper trolley (51) reinstalled to vacate the position for continuing to hoist the next section of the chain link; A4. Repeat Step A2, continue to reinstall the new upper trolley (51) on the new upper chain link (41) until all the new upper chain link (41) and the new upper trolley (51) are installed, and finally close at the middle; A5. The new upper trolley (51) is reinstalled using an 80T crane and a 120T crane. After the new upper chain link (41) and the new upper trolley (51) are reinstalled, the replacement of the lower chain link (42) and the remaining chain links (43) and the reinstallation of the lower trolley (52) and the remaining trolleys (53) require rotating the head wheel (1) twice to rotate the lower chain link (42) to the top of the belt cooler, and specifically include the following steps: B1. Temporarily connect the replaced upper chain link (41) and the lower chain link (42) at the head wheel (1) and the tail wheel (3) using chain link fixing pins; B2. Rotate the head wheel (1) in the reverse direction until all the lower chain links (42) are rotated to the top of the belt cooler and then stop; B3. Disconnect the old and new chain links at the head wheel (1) and the tail wheel (3), replace the lower chain link (42) and reinstall the corresponding lower trolley (52); B4, reversely rotate the head wheel (1) again to repeat step B2 to replace the remaining chain links (43) and reinstall the remaining trolleys (53); The belt cooler comprises a head wheel (1) and a tail wheel (3), wherein the head wheel (1) is driven by an external transmission device (2), a chain link (4) is meshed between the head wheel (1) and the tail wheel (3), and a plurality of groups of trolleys (5) are vertically arranged at equal intervals on the chain link (4); The chain link (4) comprises an upper chain link (41) and a lower chain link (42), wherein the upper chain link (41) and the lower chain link (42) are distributed in the upper and lower parts of the horizontal connection line between the head wheel (1) and the tail wheel (3); the outer ends of the upper chain link (41) and the lower chain link (42) are connected to the remaining chain link (43) to form an annular chain link (4) connected end to end; the upper chain link (41) is detachably mounted with an upper trolley (51), the lower chain link (42) is detachably mounted with a lower trolley (52), and the remaining chain link (43) is detachably mounted with a remaining trolley (53).

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