Heat exchanger of steel billet heating furnace

Abstract

The invention relates to the field of steel billet heating furnace heat exchange equipment, in particular to a steel billet heating furnace heat exchanger. The device comprises a fixing plate, a rotating disc is rotationally connected to the fixing plate, a plurality of heat exchange pipes are installed on the rotating disc, a gas supply assembly used for conveying gas into the heat exchange pipes is arranged on the fixing plate, a plurality of cleaning rods are arranged at the lower ends of the heat exchange pipes, a plurality of cleaning pads are arranged on the cleaning rods, and the cleaning pads are arranged on the cleaning rods. And a fixing assembly used for fixing the cleaning pads to the cleaning rods is arranged between the cleaning pads and the cleaning rods, a moving mechanism used for driving the multiple cleaning rods to move is arranged on one side of the rotating disc, and a driving assembly used for driving the rotating disc to rotate is arranged on the fixing plate. The cleaning device has the effect of reducing the labor intensity of cleaning work of the steel billet heating furnace heat exchanger.

Description

Technical Field

[0001] The present application relates to the field of heat exchange equipment for a steel billet heating furnace, and in particular to a heat exchanger for a steel billet heating furnace. Background Art

[0002] In the steel manufacturing industry, the billet heating furnace is one of the most important equipment. It heats the billet to the required temperature to meet the requirements of subsequent processing technology. In order to improve energy utilization and reduce energy consumption, the billet heating furnace is usually equipped with a heat exchanger to recover part of the heat in the furnace. After long-term use, the heat exchanger is prone to scaling and clogging, which not only affects the heat exchange efficiency, but also may cause uneven temperature in the furnace, directly affecting the operation efficiency of the heating furnace and product quality. Therefore, it is of great significance to develop efficient heat exchangers and improve these problems through their own structural design.

[0003] In order to improve the heat exchange efficiency of the heat exchanger of the billet heating furnace, there are three commonly used methods in the industry: one is to increase the number of heat exchange tubes inside the heat exchanger to increase the heat exchange area; the other is to regularly perform chemical or physical cleaning on the heat exchanger.

[0004] Although these solutions can alleviate the scaling problem to a certain extent, workers are still required to enter the heat exchanger for cleaning. This not only requires the heating furnace heat exchanger to be disassembled to a certain extent, but also because the heat exchange tubes in the heat exchanger are of different heights, workers are also required to bend over repeatedly, which makes the cleaning of the billet heating furnace heat exchanger more labor-intensive. Summary of the invention

[0005] In order to reduce the labor intensity of cleaning work of a steel billet heating furnace heat exchanger, the present application provides a steel billet heating furnace heat exchanger.

[0006] The heat exchanger for a steel billet heating furnace provided in this application adopts the following technical solution: A heat exchanger for a steel billet heating furnace comprises a fixed plate, to which a rotating disk is rotatably connected, a plurality of heat exchange tubes are mounted on the rotating disk, a gas supply assembly for conveying gas into the heat exchange tube is provided on the fixed plate, a plurality of cleaning rods are provided at the lower end of the heat exchange tube, a plurality of cleaning pads are provided on the cleaning rod, a fixing assembly for fixing the cleaning pad to the cleaning rod is provided between the cleaning pad and the cleaning rod, a moving mechanism for driving the plurality of cleaning rods to move is provided on one side of the rotating disk, and a driving assembly for driving the rotating disk to rotate is provided on the fixed plate.

[0007] By adopting the above technical solution, when cleaning the heat exchange tubes in the heat exchanger, the air supply component first stops supplying air to the inside of the heat exchange tubes, and then the driving component drives the rotating disk to rotate, so that the heat exchange tubes rotate, and at the same time the moving mechanism drives the cleaning rod to move back and forth, so that the cleaning pad cleans the outer surfaces of multiple heat exchange tubes back and forth in turn, thereby ensuring the cleanliness of the heat exchange tubes and improving the heat exchange efficiency. At the same time, there is no need to disassemble the heating furnace heat exchanger, and the labor intensity of the workers is also reduced.

[0008] Optionally, the driving assembly includes a driving motor fixedly connected to a fixed plate, a driving gear fixedly connected to an output shaft of the driving motor, the driving gear being coaxially arranged with the output shaft of the driving motor, a passive gear being provided on one side of the driving gear, and the passive gear being coaxially arranged with and fixedly connected to the rotating disk.

[0009] By adopting the above technical solution, the driving motor drives the driving gear to rotate, and the driving gear meshes with the passive gear, thereby driving the rotating disk to rotate, realizing the rotation of the heat exchange tube, improving the heat exchange efficiency, and ensuring the stability and reliability of the structure.

[0010] Optionally, the air supply assembly includes a first ring tube and a second ring tube, the first ring tube is fixedly connected and connected to an air inlet pipe, the second ring tube is fixedly connected and connected to an air outlet pipe, one end of the heat exchange tube is fixedly connected and connected to the first ring tube, and the other end of the heat exchange tube is fixedly connected and connected to the second ring tube.

[0011] By adopting the above technical solution, uniform distribution of gas in the heat exchange tube is achieved, thereby improving heat exchange efficiency.

[0012] Optionally, the moving mechanism includes a moving triangular rod, the length direction of the moving triangular rod is parallel to the length direction of the heat exchange tube, the moving triangular rod is passed through and slidably connected to the fixed plate, a hydraulic cylinder is provided on one side of the fixed plate, and a locking assembly for fixing the piston rod of the hydraulic cylinder and the moving triangular rod is provided between the two.

[0013] By adopting the above technical solution, the length direction of the movable triangular rod is parallel to the length direction of the heat exchange tube, so that the movable triangular rod can slide on the fixed plate in a direction parallel to the length direction of the heat exchange tube. The locking assembly between the piston rod of the hydraulic cylinder and the movable triangular rod can firmly fix the movable triangular rod in the desired position, thereby realizing precise movement control of the cleaning rod, making multiple cleaning rods slide synchronously, and improving the cleaning effect. At the same time, when cleaning is not needed, the locking assembly can be adjusted to cancel the fixing of the movable triangular rod and the hydraulic cylinder by the locking assembly, and then the movable rod can be rotated to make the multiple cleaning rods rotate to the side close to the bottom surface of the fixed plate, thereby increasing the service life of the cleaning rod and realizing flexible cleaning work.

[0014] Optionally, the locking assembly includes a locking plate fixedly connected to the piston rod of the hydraulic cylinder, a fixing bolt is threadedly connected to the locking plate, and a rod portion of the fixing bolt passes through the locking plate and is threadedly connected to the movable triangular rod.

[0015] By adopting the above technical solution, the fixing bolt can firmly connect the piston rod of the hydraulic cylinder with the moving triangular rod, ensuring the stability of the moving triangular rod when driving the cleaning rod to move, thereby improving the reliability and efficiency of the cleaning process. The fixing and disassembly between the moving triangular rod and the piston rod of the hydraulic cylinder can be achieved by rotating the fixing bolt.

[0016] Optionally, the fixing assembly includes two arc plates, the arc plates are arranged to be semicircular and the outer arc surfaces of the two arc plates are located on the side where the two arc plates are close to each other, the cleaning pad is fixed to the inner arc surface of the arc plate, and when the heat exchange tube is placed at the lower part of the fixing plate, the outer arc surface of the heat exchange tube abuts against the cleaning pad.

[0017] By adopting the above technical solution, the two arc plates are set in a semicircular shape and the outer arc surfaces are opposite, so that the cleaning pad can fit tightly on the outer arc surface of the heat exchange tube. Therefore, when the heat exchange tube rotates, the cleaning pad can effectively scrape off the dirt on the surface of the heat exchange tube. At the same time, the driving motor can be controlled to reverse so that the arc plate on the other side can clean the heat exchange tube, thereby ensuring the cleaning effect of the heat exchange tube and improving the heat exchange efficiency.

[0018] Optionally, the cleaning rod includes three moving blocks, two adjacent moving blocks are rotatably connected to each other, rubber tubes for limiting the rotation range of the moving blocks are provided on both sides of the cleaning rod, one end of the rubber tube is fixedly connected to the moving triangular rod, and the other end of the rubber tube is fixedly connected to the arc plate, the cleaning pad is configured as a waterproof rubber cleaning pad, a cleaning cavity is defined in the cleaning pad, the rubber tube is connected to the cavity, a water storage cavity is defined on the moving triangular rod, the rubber tube is connected to the water storage cavity, a cleaning hole is defined on the side of the cleaning pad away from the inner arc surface of the arc plate, the cleaning hole is placed in communication with the cleaning cavity, and a sealing component for sealing the cleaning hole is provided at the cleaning hole.

[0019] By adopting the above technical solution, the rubber tube is provided so that the cleaning rod can rotate to a certain extent through its own moving block, so that multiple heat exchange tubes can pass through the cleaning pad smoothly, and water flow can be input into the water storage cavity so that the water flow enters the cleaning cavity through the rubber tube, and finally the cleaning pad is flushed and cleaned, so that the cleaning pad maintains a good cleaning ability, and effectively cleans the heat exchange tubes, thereby improving the heat exchange efficiency.

[0020] Optionally, the sealing assembly includes an adjusting column slidably connected to the cleaning hole, a sealing plate is fixedly connected to the adjusting column, the sealing plate is placed in the cleaning cavity, a spring is fixedly connected between the sealing plate and the cleaning cavity, and under the action of the spring, the sealing plate is pressed against the cleaning hole, and an abutment plate is fixedly connected to one side of the adjusting column outside the cleaning hole, and the abutment plate is used to abut against the heat exchange tube.

[0021] By adopting the above technical solution, the plugging assembly can effectively and flexibly plug the cleaning hole. Under the action of the spring, the plugging plate can be tightly pressed against the cleaning hole to reduce the leakage of cleaning water. When the heat exchange tube moves, the abutment plate abuts against the heat exchange tube, causing the adjustment column to move into the cleaning cavity, thereby opening the cleaning hole and spraying the cleaning water, which not only sprays the heat exchange tube but also flushes the cleaning pad, ensuring the effectiveness and reliability of the cleaning process.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The driving assembly can drive the rotating disk to rotate, so that the heat exchange tube rotates, and the moving mechanism drives the cleaning rod to move back and forth, so that the cleaning pad cleans the outer surfaces of multiple heat exchange tubes back and forth in sequence, thereby ensuring the cleanliness of the heat exchange tubes and improving the heat exchange efficiency. At the same time, there is no need to disassemble the heating furnace heat exchanger, and the labor intensity of workers is also reduced; 2. At the same time, when cleaning is not needed, the locking assembly can be adjusted to cancel the fixing of the moving triangle rod and the hydraulic cylinder by the locking assembly, and then the moving rod can be rotated to make the multiple cleaning rods rotate to the side close to the bottom surface of the fixed plate, thereby increasing the service life of the cleaning rods and achieving flexible cleaning work; 3. The abutment plate abuts against the heat exchange tube, causing the adjustment column to move into the cleaning cavity, thereby opening the cleaning hole and spraying out the cleaning water, which not only sprays the heat exchange tube but also flushes the cleaning pad, ensuring the effectiveness and reliability of the cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a schematic diagram of the structure of a drive assembly according to an embodiment of the present application; Figure 3 is a schematic structural diagram of a cleaning rod according to an embodiment of the present application; Figure 4 It is a schematic diagram of the structure of the blocking component of an embodiment of the present application.

[0024] Explanation of the accompanying drawings: 1. fixed plate; 2. heat exchange tube; 3. rotating disk; 4. air supply assembly; 41. first ring tube; 411. air inlet pipe; 42. second ring tube; 421. air outlet pipe; 5. cleaning rod; 51. moving block; 6. cleaning pad; 61. cleaning cavity; 62. cleaning hole; 7. fixed assembly; 71. arc plate; 8. moving mechanism; 81. moving triangle rod; 811. water storage cavity; 82. hydraulic cylinder; 83. locking assembly; 831. locking plate; 832. fixing bolt; 9. driving assembly; 91. driving motor; 92. driving gear; 93. passive gear; 10. rubber tube; 11. sealing assembly; 111. adjusting column; 112. sealing plate; 113. spring; 114. abutting plate; 12. bristles; 13. water inlet pipe. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1 -Attached Figure 4 This application is described in further detail.

[0026] The present application embodiment discloses a heat exchanger for a steel billet heating furnace, referring to Figure 1 and Figure 2 The fixed plate 1 is provided with a rectangular parallelepiped. A rotating disk 3 is rotatably connected to the fixed plate 1. A plurality of heat exchange tubes 2 are fixedly connected to the rotating disk 3 on the side facing away from the fixed plate 1. The fixed plate 1 is provided with a gas supply component 4 for conveying gas into the heat exchange tubes 2.

[0027] The air supply assembly 4 includes a first annular tube 41 and a second annular tube 42, which are coaxially arranged and fixedly connected to the rotating disk 3. The first annular tube 41 is fixedly connected and connected to an air inlet pipe 411, and the second annular tube 42 is fixedly connected and connected to an air outlet pipe 421. In this embodiment, the air inlet pipe 411 and the air outlet pipe 421 are in a disassembled state. One end of the heat exchange tube 2 is fixedly connected and connected to the first annular tube 41, and the other end of the heat exchange tube 2 is fixedly connected and connected to the second annular tube 42.

[0028] The flue gas can then be transported from the air inlet pipe 411 to the first annular pipe 41 , and then the flue gas can enter the second annular pipe 42 through the heat exchange pipe 2 , and be discharged out of the second annular pipe 42 through the air outlet pipe 421 on the second annular pipe 42 .

[0029] A driving assembly 9 for driving the rotating disk 3 to rotate is provided on the fixed plate 1. The driving assembly 9 includes a driving motor 91 fixedly connected to the upper end of the fixed plate 1. The driving motor 91 is configured as a servo motor and can rotate counterclockwise or clockwise. The output shaft of the driving motor 91 passes through the fixed plate 1 and is fixedly connected to a driving gear 92. The driving gear 92 is located on the side of the fixed plate 1 away from the driving motor 91. The driving gear 92 is coaxially arranged with the output shaft of the driving motor 91. A driven gear 93 is provided on one side of the driving gear 92. The driven gear 93 is coaxially arranged with the rotating disk 3 and is fixedly connected. The heat exchange tube 2 passes through the rotating disk 3 and is fixedly connected to the rotating disk 3.

[0030] Then the driving motor 91 is started, and the driving motor 91 can drive the driving gear 92 to rotate. Since the driving gear 92 is meshed with the passive gear 93, the rotating disk 3 will rotate at this time, and then the heat exchange tube 2 will rotate together with the rotating disk 3.

[0031] Reference Figure 1 , Figure 2 and Figure 3 A plurality of cleaning rods 5 are provided at the lower end of the heat exchange tube 2, and the plurality of cleaning rods 5 are arranged at equal distances along the length direction of the heat exchange tube 2. A plurality of cleaning pads 6 are provided on the cleaning rods 5, and a fixing assembly 7 for fixing the cleaning pads 6 on the cleaning rods 5 is provided between the cleaning pads 6 and the cleaning rods 5. The fixing assembly 7 in this embodiment is provided as two arc plates 71, and the arc plates 71 are provided as semicircular shapes, and the outer arc surfaces of the two arc plates 71 are located on the side where the two arc plates 71 are close to each other, and the cleaning pads 6 are fixedly connected to the inner arc surfaces of the arc plates 71.

[0032] Therefore, when the heat exchange tube 2 rotates to the lower part of the fixing plate 1 , the outer arc surface of the heat exchange tube 2 can abut against the cleaning pad 6 , and the cleaning pad 6 can clean the arc-shaped outer wall of the heat exchange tube 2 .

[0033] At the same time, in order to increase the cleaning area of ​​the cleaning pad 6 on the heat exchange tube 2, a plurality of bristles 12 are fixedly connected to the upper end of the arc plate 71, the bristles 12 abut against the upper part of the heat exchange tube 2, and a moving mechanism 8 is provided on one side of the rotating disk 3 for driving the plurality of cleaning rods 5 to move.

[0034] The moving mechanism 8 includes a moving triangular rod 81, the length direction of the moving triangular rod 81 is parallel to the length direction of the heat exchange tube 2, and the lower end of the moving triangular rod 81 is placed in the same plane as the lower end surface of the fixed plate 1. The moving triangular rod 81 is inserted and slidably connected to the fixed plate 1. Under the restriction of the fixed plate 1, the moving triangular rod 81 can only slide in a direction parallel to the length of the heat exchange tube 2. A hydraulic cylinder 82 is provided on one side of the fixed plate 1, and a locking assembly 83 for fixing the piston rod of the hydraulic cylinder 82 and the moving triangular rod 81 is provided between the two.

[0035] The locking assembly 83 includes a locking plate 831 fixedly connected to the piston rod of the hydraulic cylinder 82. The locking plate 831 is arranged in a triangular shape and fits the side wall of the movable triangular rod 81. A fixing bolt 832 is threadedly connected to the locking plate 831. The rod of the fixing bolt 832 passes through the locking plate 831 and is threadedly connected to the movable triangular rod 81.

[0036] Thus, the fixing and disassembly between the movable triangular rod 81 and the piston rod of the hydraulic cylinder 82 can be achieved by rotating the fixing bolt 832. When the heat exchange tube 2 does not need to be cleaned, the movable triangular rod 81 can be separated from the restriction of the fixing plate 1, and then the movable triangular rod 81 can be rotated to invert the cleaning rod 5 on the movable triangular rod 81, and then the movable triangular rod 81 can be inserted into the fixing plate 1, so that the cleaning rod 5 can remain in a state of not cleaning the heat exchange tube 2.

[0037] Reference Figure 1 , Figure 3 and Figure 4 In order to allow multiple heat exchange tubes 2 to pass through the cleaning pad 6 smoothly, the cleaning rod 5 includes three superimposed moving blocks 51, and two adjacent moving blocks 51 are rotatably connected to each other. The lowest moving block 51 is fixedly connected to the moving triangular rod 81, and the moving block 51 can only rotate to both sides of the length direction of the moving triangular rod 81.

[0038] Rubber tubes 10 are provided on both sides of the cleaning rod 5 for limiting the rotation range of the moving block 51. The cleaning pad 6 is configured as a waterproof rubber cleaning pad 6. A cleaning cavity 61 is provided in the cleaning pad 6. Clean water is contained in the cleaning cavity 61. A water storage cavity 811 is provided on the moving triangular rod 81. The water storage cavity 811 is arranged along the length direction of the moving triangular rod 81.

[0039] One end of the rubber tube 10 is fixedly connected to the movable triangular rod 81 and the rubber tube 10 is connected to the water storage cavity 811. The other end of the rubber tube 10 is fixedly connected to the arc plate 71 and the rubber tube 10 is connected to the cleaning cavity 61. A cleaning hole 62 is opened on the side of the cleaning pad 6 away from the inner arc surface of the arc plate 71. The cleaning hole 62 is connected to the cleaning cavity 61. A sealing component 11 for sealing the cleaning hole 62 is provided at the cleaning hole 62.

[0040] The plugging assembly 11 includes an adjusting column 111 slidably connected to the cleaning hole 62, and a plugging plate 112 is fixedly connected to the adjusting column 111. The plugging plate 112 is used to plug the cleaning hole 62 and is placed in the cleaning cavity 61. A spring 113 is fixedly connected between the plugging plate 112 and the inner wall of the cleaning cavity 61, and the plugging plate 112 is pressed against the cleaning hole 62 under the action of the spring 113. An abutment plate 114 is fixedly connected to one side of the adjusting column 111 outside the cleaning hole 62, and the area of ​​the abutment plate 114 is smaller than that of the plugging plate 112 and cannot block the cleaning hole 62. In FIG. 4 , the abutment plate 114 abuts against the arc-shaped side wall of the heat exchange tube 2.

[0041] One end of the movable triangle plate close to the fixed plate 1 is fixedly connected and communicated with the water inlet pipe 13, and the water inlet pipe 13 is communicated with the water storage cavity 811. Thus, a certain pressure of water can be introduced into and out of the water inlet pipe 13 through the external pump body, and then in the process of cleaning the heat exchange tube 2, the blocking plate 112 can be pressed against the cleaning hole 62 under the action of the spring 113 to reduce the leakage of the cleaning water. When the heat exchange tube 2 moves to the cleaning pad 6, the abutment plate 114 abuts against the heat exchange tube 2, and the spring 113 is compressed at this time, so that the adjustment column 111 moves into the cleaning cavity 61, thereby opening the cleaning hole 62 and realizing the spraying of the cleaning water, spraying the heat exchange tube 2 and flushing the cleaning pad 6 at the same time.

[0042] The implementation principle of a heat exchanger for a steel billet heating furnace in an embodiment of the present application is as follows: when cleaning the heat exchange tube 2 in the heat exchanger, first disconnect the air inlet pipe 411 and the air outlet pipe 421 in the air supply assembly 4, and stop supplying air to the inside of the heat exchange tube 2. Then, start the drive motor 91 to drive the rotating disk 3 to rotate, so that the heat exchange tube 2 rotates. At the same time, start the hydraulic cylinder 82 to reciprocate and extend the hydraulic cylinder 82, and input a water flow with a certain pressure into the water inlet pipe 13, so that the moving mechanism 8 drives the cleaning rod 5 to move back and forth, so that the cleaning pad 6 cleans the outer surfaces of multiple heat exchange tubes 2 back and forth in turn, and the cleaning hole 62 is used to ensure and improve the cleaning efficiency of the cleaning pad 6 on the heat exchange tube 2.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A heat exchanger for a steel billet heating furnace, characterized in that: The invention comprises a fixed plate (831) (1), a rotating disk (3) being rotatably connected to the fixed plate (831) (1), a plurality of heat exchange tubes (2) being mounted on the rotating disk (3), a gas supply assembly (4) for conveying gas into the heat exchange tube (2) being provided on the fixed plate (831) (1), a plurality of cleaning rods (5) being provided at the lower end of the heat exchange tube (2), a plurality of cleaning pads (6) being provided on the cleaning rod (5), a fixing assembly (7) for fixing the cleaning pad (6) on the cleaning rod (5) being provided between the cleaning pad (6) and the cleaning rod (5), a moving mechanism (8) for driving the plurality of cleaning rods (5) to move being provided on one side of the rotating disk (3), and a driving assembly (9) for driving the rotating disk (3) to rotate being provided on the fixed plate (831) (1).

2. The heat exchanger for a steel billet heating furnace according to claim 1, characterized in that: The driving assembly (9) comprises a driving motor (91) fixedly connected to a fixing plate (831) (1); a driving gear (92) is fixedly connected to an output shaft of the driving motor (91); the driving gear (92) is coaxially arranged with the output shaft of the driving motor (91); a driven gear (93) is provided on one side of the driving gear (92); the driven gear (93) is coaxially arranged with and fixedly connected to the rotating disk (3).

3. The heat exchanger for a steel billet heating furnace according to claim 1, characterized in that: The air supply assembly (4) comprises a first annular tube (41) and a second annular tube (42); the first annular tube (41) is fixedly connected to and communicated with an air inlet pipe (411); the second annular tube (42) is fixedly connected to and communicated with an air outlet pipe (421); one end of the heat exchange tube (2) is fixedly connected to and communicated with the first annular tube (41); the other end of the heat exchange tube (2) is fixedly connected to and communicated with the second annular tube (42).

4. The heat exchanger for a steel billet heating furnace according to claim 1, characterized in that: The moving mechanism (8) comprises a moving triangular rod (81), the length direction of the moving triangular rod (81) being parallel to the length direction of the heat exchange tube (2), the moving triangular rod (81) being passed through and slidably connected to the fixing plate (831) (1), a hydraulic cylinder (82) being provided on one side of the fixing plate (831) (1), and a locking assembly (83) for fixing the piston rod of the hydraulic cylinder (82) and the moving triangular rod (81) being provided between the two.

5. The heat exchanger for a steel billet heating furnace according to claim 4, characterized in that: The locking assembly (83) comprises a locking plate (831) (1) fixedly connected to the piston rod of the hydraulic cylinder (82), a fixing bolt (832) being threadedly connected to the locking plate (831) (1), and a rod portion of the fixing bolt (832) passing through the locking plate (831) (1) and being threadedly connected to the movable triangular rod (81).

6. A heat exchanger for a steel billet heating furnace according to claim 5, characterized in that: The fixing assembly (7) comprises two arc-shaped plates (71), the arc-shaped plates (71) being arranged in a semicircular shape and the outer arc surfaces of the two arc-shaped plates (71) being located on a side where the two arc-shaped plates (71) are close to each other, the cleaning pad (6) being fixedly connected to the inner arc surface of the arc-shaped plates (71), and when the heat exchange tube (2) is placed at the lower part of the fixing plate (831) (1), the outer arc surface of the heat exchange tube (2) abuts against the cleaning pad (6).

7. The heat exchanger for a steel billet heating furnace according to claim 6, characterized in that: The cleaning rod (5) comprises three moving blocks (51), two adjacent moving blocks (51) are rotatably connected to each other, two sides of the cleaning rod (5) are provided with rubber tubes (10) for limiting the rotation range of the moving blocks (51), one end of the rubber tube (10) is fixedly connected to the moving triangular rod (81), and the other end of the rubber tube (10) is fixedly connected to the arc plate (71), the cleaning pad (6) is configured as a watertight rubber cleaning pad (6), and a cleaning space is provided in the cleaning pad (6). The movable triangular rod (81) is provided with a water storage cavity (811), the rubber tube (10) is connected to the water storage cavity (811), a cleaning hole (62) is provided on a side of the cleaning pad (6) away from the inner arc surface of the arc plate (71), the cleaning hole (62) is connected to the cleaning cavity (61), and a blocking component (11) for blocking the cleaning hole (62) is provided at the cleaning hole (62).

8. The heat exchanger for a steel billet heating furnace according to claim 7, characterized in that: The blocking assembly (11) comprises an adjusting column (111) slidably connected to the cleaning hole (62); a blocking plate (112) is fixedly connected to the adjusting column (111); the blocking plate (112) is placed in the cleaning cavity (61); a spring (113) is fixedly connected between the blocking plate (112) and the cleaning cavity (61); under the action of the spring (113), the blocking plate (112) is pressed against the cleaning hole (62); a contact plate (114) is fixedly connected to one side of the adjusting column (111) outside the cleaning hole (62); the contact plate (114) is used to contact the heat exchange tube (2).

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