Pre-oxidation furnace cleaning device and pre-oxidation furnace cleaning method

Abstract

The invention provides a pre-oxidation furnace cleaning device and a pre-oxidation furnace cleaning method, and belongs to the field of pre-oxidation furnace cleaning. The pre-oxidation furnace cleaning device is used for entering a pre-oxidation furnace to effectively remove residual particles on the inner wall of the pre-oxidation furnace and in a splitter plate in the pre-oxidation furnace, a cleaning medium is introduced into a first medium channel through a medium inlet, and the cleaning medium sequentially passes through the first medium channel, a second medium channel and a hose and is finally sprayed out through a nozzle. The splitter plate is used for cleaning the inner wall and the interior of the pre-oxidation furnace. The sliding block is controlled to slide along the connecting rod, the connecting block further pulls the connecting rope, the hose used for being connected with the nozzle is bent, and therefore the nozzle can clean different areas. According to the pre-oxidation furnace cleaning device, a large amount of manpower is saved, the cleaning efficiency is improved, after cleaning is conducted through the pre-oxidation furnace cleaning device, the number of particles left on the inner wall of aluminum oxide and a splitter plate in the aluminum oxide is small, and cleaning is thorough.

Description

Technical Field

[0001] The present application relates to the field of pre-oxidation furnace cleaning, and more specifically, to a pre-oxidation furnace cleaning device and a pre-oxidation furnace cleaning method. Background Art

[0002] In the carbonization production of carbon fiber, the process of carbon fiber pre-oxidation is to combine oxygen molecules in the air with PAN fibers under high temperature environment, so that the polymer chains are cross-linked and the fiber density is increased. The removal of non-carbon elements is mainly manifested in the release of many small molecular cracking products, and the discharged small molecules include waste mainly composed of particulate matter. In addition, in order to increase the friction resistance of the precursor and reduce the surface defects caused by the friction of the precursor with a large number of guide rollers, the precursor oil is added to the carbonization production of carbon fiber. The precursor oil can be decomposed during the pre-oxidation gradient reaction process, thereby effectively alleviating the heat melting situation that may be caused by the concentrated heat release in the complex exothermic oxidation process, thereby improving the uniformity of oxidation, and the process will also produce a certain amount of particulate matter. These particulate matter is small in size and has strong adsorption. Under the action of the circulating fan and exhaust fan pressure of the pre-oxidation furnace, part of them are discharged from the furnace cavity, and part of them form particulate matter blocks in the furnace cavity to block the splitter plate of the furnace cavity, and are easily adsorbed inside the furnace cavity, resulting in poor exhaust gas discharge in the furnace, causing equipment damage, and wasting a lot of manpower and time to clean up during shutdown and maintenance. Summary of the invention

[0003] The present application provides a pre-oxidation furnace cleaning device and a pre-oxidation furnace cleaning method, which can effectively remove residual particulate matter in the pre-oxidation furnace, save manpower, and improve cleaning efficiency.

[0004] The embodiment of the present application is implemented as follows:

[0005] In the first aspect, the present application example provides a pre-oxidation furnace cleaning device, which includes a frame, a lifting mechanism and a cleaning mechanism, the frame includes a support member, the support member has an internal first medium channel and a medium inlet connected to the first medium channel, the lifting mechanism includes a connecting rod and a sliding block, the connecting rod has an internal second medium channel, one end of the connecting rod is connected to the support member, and the second medium channel is connected to the first medium channel, the sliding block is mounted on the connecting rod and can slide along the connecting rod, the cleaning mechanism includes a hose, a nozzle and a first connecting rope, one end of the hose is connected to the other end of the connecting rod, and the hose is connected to the second medium channel, the other end of the hose is connected to the nozzle, and the nozzle is connected to the sliding block through the first connecting rope.

[0006] In the above technical solution, the pre-oxidation furnace cleaning device of the present application is used to enter the pre-oxidation furnace to clean its inner wall and the internal diverter plate, and the cleaning medium is introduced into the first medium channel through the medium inlet, and the cleaning medium passes through the first medium channel, the second medium channel and the hose in turn, and finally sprayed out from the nozzle to clean the inner wall and the internal diverter plate of the pre-oxidation furnace. The control sliding block slides along the connecting rod, and the connecting block further pulls the connecting rope to bend the hose used to connect the nozzle, so that the nozzle can be cleaned for different surface areas.

[0007] The pre-oxidation furnace cleaning device of the present application can enter the pre-oxidation furnace and effectively remove residual particulate matter on the inner wall of the pre-oxidation furnace and the internal diverter plate, saving a lot of manpower and improving cleaning efficiency. After cleaning by the pre-oxidation furnace cleaning device of the present application, there are fewer residual particulate matter on the inner wall of the alumina and the internal diverter plate, and the cleaning is more thorough.

[0008] In some possible implementation schemes, the pre-oxidation furnace cleaning device includes a plurality of lifting mechanisms and a plurality of cleaning mechanisms, the plurality of lifting mechanisms are connected to the support member side by side and at intervals, and the plurality of lifting mechanisms and the plurality of cleaning mechanisms are connected correspondingly.

[0009] In the above technical solution, multiple lifting mechanisms independently control multiple cleaning mechanisms, which can enable multiple nozzles to clean the inner wall of alumina and different positions of the internal diverter plate to achieve comprehensive cleaning, which can not only improve the cleaning efficiency but also enable more thorough cleaning.

[0010] In some possible embodiments, the nozzle has a rotatable spray orifice.

[0011] In the above technical solution, the rotatable injection port can further enable the nozzle to clean different surface areas.

[0012] In some possible embodiments, the lifting mechanism further includes a rotating motor and a second connecting rope, the rotating motor is connected to the support member, the rotating motor is connected to one end of the second connecting rope and controls the winding of the second connecting rope, and the other end of the second connecting rope is connected to the sliding block.

[0013] In the above technical solution, the rotating motor can drive the second connecting rope to wind, and the second connecting rope further pulls the connecting block to enable the connecting block to slide along the connecting rod.

[0014] In some possible implementation schemes, the lifting mechanism further includes a solenoid valve connected to the support member and configured to control the opening and closing of the rotating motor.

[0015] In some possible embodiments, the frame also includes a lifting motor and a first threaded rod, the outer wall of the first threaded rod has an external thread, the lifting motor is arranged at one end of the first threaded rod, a first connecting member is arranged at the end of the support member, the first connecting member has a first through hole, the inner wall of the first through hole has an internal thread, the support member is sleeved on the first threaded rod through the first connecting member, and the first connecting member is threadably matched with the first threaded rod.

[0016] In the above technical solution, the lifting motor is used to control the support to move up and down along the first threaded rod, so that the nozzle descends to different layers to achieve cleaning of the inner walls at different positions in the pre-oxidation furnace and cleaning of the diverter plates at different layers.

[0017] In some possible implementation schemes, a limit sensor is provided on a side of the support member close to the lifting mechanism.

[0018] In the above technical solution, the limit sensor can control the height of the support member moving up and down along the first threaded rod to prevent the support member from directly hitting the diverter plate.

[0019] In some possible embodiments, the frame also includes a horizontal moving motor and a second threaded rod, the outer wall of the second threaded rod has an external thread, the horizontal moving motor is arranged at one end of the second threaded rod, and a second connecting piece is arranged at the other end of the first threaded rod, the second connecting piece has a second through hole, and the inner wall of the second through hole has an internal thread, the first threaded rod is sleeved on the second threaded rod through the second connecting piece, and the second connecting piece is threadably matched with the second threaded rod.

[0020] In the above technical solution, the horizontal moving motor is used to control the displacement of the support member in the horizontal direction, so as to achieve the cleaning of different surface areas by the nozzle.

[0021] In some possible implementations, the pre-oxidation furnace cleaning device further includes a water-gas switching valve, a water pipe for connecting to a water source, and an air pipe for connecting to an air source, and both the water pipe and the air pipe are connected to the medium inlet through the water-gas switching valve.

[0022] In the above technical solution, water or gas can be introduced into the medium inlet through the water-gas switching valve, and the nozzle can spray water or gas to clean the inside of the pre-oxidation furnace.

[0023] In the second aspect, the present application example provides a pre-oxidation furnace cleaning method using the pre-oxidation furnace cleaning device in the above-mentioned embodiment, comprising: placing the pre-oxidation furnace cleaning device in the pre-oxidation furnace, introducing liquid and / or gas into the medium inlet, the liquid and / or gas passes through the first medium channel, the second medium channel and the hose in sequence to reach the nozzle, by controlling the sliding block to slide on the connecting rod, the first connecting rope pulls up the nozzle, and the hose bends to change the spray angle of the nozzle, and the nozzle sprays liquid and / or gas to clean different areas of the pre-oxidation furnace.

[0024] In the above technical scheme, the pre-oxidation furnace cleaning method of the present application is simple and convenient, and the cleaning efficiency is improved. After cleaning, there are fewer particles remaining in the inner wall of the alumina and the internal diverter plate, and the cleaning is more thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a structural schematic diagram of a pre-oxidation furnace cleaning device from a first perspective according to an embodiment of the present application;

[0027] Figure 2 It is a structural schematic diagram of the pre-oxidation furnace cleaning device from a second perspective of an embodiment of the present application;

[0028] Figure 3 This is a process flow chart of the pre-oxidation furnace cleaning method according to an embodiment of the present application.

[0029] Icons: 10-oxidation furnace cleaning device; 100-frame; 110-support member; 111-medium inlet; 112-first connecting member; 120-lifting motor; 130-first threaded rod; 131-second connecting member; 140-horizontal moving motor; 150-second threaded rod; 151-limiting block; 200-lifting mechanism; 210-connecting rod; 220-sliding block; 230-rotating motor; 240-second connecting rope; 250-solenoid valve; 300-cleaning mechanism; 310-hose; 320-nozzle; 330-first connecting rope; 400-limit sensor; 500-water-gas switching valve. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The following is a specific description of a pre-oxidation furnace cleaning device 10 and a pre-oxidation furnace cleaning method according to an embodiment of the present application:

[0037] See also Figure 1 The present application provides a pre-oxidation furnace cleaning device 10 , which includes a frame 100 , a lifting mechanism 200 and a cleaning mechanism 300 .

[0038] Among them, the frame 100 is the main structure of the pre-oxidation furnace cleaning device 10, and the frame 100 includes a support member 110. The support member 110 is a structure for supporting the lifting mechanism 200. The support member 110 has an internal first medium channel (not shown) and a medium inlet 111 connected to the first medium channel.

[0039] In such Figure 1 In the illustrated embodiment, the support member 110 is a columnar structure, the medium inlet 111 is located at the upper side of the middle of the support member 110, and the first medium channel is distributed along the columnar structure. In some other embodiments of the present application, the support member 110 may also be in other shapes.

[0040] Optionally, the frame 100 also includes a lifting motor 120 and a first threaded rod 130. The outer wall of the first threaded rod 130 has an external thread. The lifting motor 120 is arranged at one end of the first threaded rod 130. A first connecting member 112 is arranged at the end of the support member 110. The first connecting member 112 has a first through hole (not shown in the figure). The inner wall of the first through hole has an internal thread. The support member 110 is sleeved on the first threaded rod 130 through the first connecting member 112, and the first connecting member 112 is threadedly matched with the first threaded rod 130.

[0041] The lifting motor 120 is used to control the support member 110 to move up and down along the first threaded rod 130, so that the nozzle 320 descends to different layers to achieve cleaning of the inner wall at different positions in the pre-oxidation furnace and cleaning of the diverter plates at different layers.

[0042] A limit sensor 400 is provided on one side of the support member 110 close to the lifting mechanism 200. The limit sensor 400 can control the height of the support member 110 moving up and down along the first threaded rod 130, prevent the support member 110 from directly hitting the diverter plate, and enable the cleaning mechanism 300 to accurately enter the narrow space of the pre-oxidation furnace for cleaning.

[0043] See also Figure 2 Optionally, the frame 100 also includes a horizontal moving motor 140 and a second threaded rod 150, the outer wall of the second threaded rod 150 has an external thread, the horizontal moving motor 140 is arranged at one end of the second threaded rod 150, and the other end of the first threaded rod 130 is provided with a second connecting member 131, the second connecting member 131 has a second through hole, and the inner wall of the second through hole has an internal thread, the first threaded rod 130 is sleeved on the second threaded rod 150 through the second connecting member 131, and the second connecting member 131 is threadedly matched with the second threaded rod 150.

[0044] Optionally, the second threaded rod 150 further includes a limit block 151 , which is disposed at an end of the second threaded rod 150 , and the limit block 151 and the horizontal moving motor 140 are respectively located at two ends of the second threaded rod 150 .

[0045] The horizontal moving motor 140 is used to control the displacement of the support member 110 in the horizontal direction, so that the nozzle 320 can clean different surface areas.

[0046] Please continue reading Figure 1 The lifting mechanism 200 is a structure for controlling the lifting of the cleaning mechanism 300. The lifting mechanism 200 includes a connecting rod 210 and a sliding block 220. The connecting rod 210 has an internal second medium channel (not shown). One end of the connecting rod 210 is connected to the support member 110, and the second medium channel is connected to the first medium channel. The sliding block 220 is sleeved on the connecting rod 210 and can slide along the connecting rod 210.

[0047] Furthermore, the lifting mechanism 200 also includes a rotating motor 230 and a second connecting rope 240, the rotating motor 230 is connected to the support member 110, the rotating motor 230 is connected to one end of the second connecting rope 240 and controls the winding of the second connecting rope 240, and the other end of the second connecting rope 240 is connected to the sliding block 220.

[0048] The rotating motor 230 can drive the second connecting rope 240 to wind, and the second connecting rope 240 further pulls the connecting block to enable the connecting block to slide along the connecting rod 210 .

[0049] Furthermore, the lifting mechanism 200 further includes a solenoid valve 250 , which is connected to the support member 110 and is used to control the opening and closing of the rotating motor 230 .

[0050] The cleaning mechanism 300 is a structure for connecting the lifting mechanism 200 and spraying a medium to clean the inner wall of the pre-oxidation furnace and the internal diverter plate. The cleaning mechanism 300 includes a hose 310, a nozzle 320 and a first connecting rope 330. One end of the hose 310 is connected to the other end of the connecting rod 210, and the hose 310 is connected to the second medium channel. The other end of the hose 310 is connected to the nozzle 320, and the nozzle 320 is connected to the sliding block 220 through the first connecting rope 330.

[0051] Optionally, the nozzle 320 has a rotatable injection port, and the rotatable injection port can achieve self-rotation through medium pressure, so that the nozzle 320 can further clean different surface areas.

[0052] It should be noted that the lifting mechanism 200 and the cleaning mechanism 300 in the pre-oxidation furnace cleaning device 10 of the present application correspond to each other one by one, and may be one or more. When the pre-oxidation furnace cleaning device 10 includes multiple lifting mechanisms 200 and multiple cleaning mechanisms 300, the multiple lifting mechanisms 200 are connected to the support member 110 side by side and at intervals, and the multiple lifting mechanisms 200 and the multiple cleaning mechanisms 300 are connected correspondingly.

[0053] The multiple lifting mechanisms 200 independently control the multiple cleaning mechanisms 300, so that the multiple nozzles 320 can clean the inner wall of the alumina and different positions of the internal diverter plate to achieve comprehensive cleaning, which can not only improve the cleaning efficiency but also enable more thorough cleaning.

[0054] The pre-oxidation furnace cleaning device 10 further includes a water-gas switching valve 500 , a water pipe for connecting to a water source, and an air pipe for connecting to an air source. Both the water pipe and the air pipe are connected to the medium inlet 111 through the water-gas switching valve 500 .

[0055] Water or gas can be introduced into the medium inlet 111 through the water-gas switching valve 500, and the nozzle 320 can spray water or gas to clean the inside of the pre-oxidation furnace, thereby realizing the switching of the cleaning medium.

[0056] It should be noted that the various structures and accessories of the pre-oxidation furnace cleaning device 10 of the present application are made of high-temperature resistant materials, which can withstand high temperatures of 250°C to 300°C.

[0057] The pre-oxidation furnace cleaning device 10 of the present application is used to enter the pre-oxidation furnace to clean its inner wall and the internal diverter plate. The cleaning medium is introduced into the first medium channel through the medium inlet 111. The cleaning medium passes through the first medium channel, the second medium channel and the hose 310 in sequence, and is finally sprayed out by the nozzle 320 to clean the inner wall and the internal diverter plate of the pre-oxidation furnace. The sliding block 220 is controlled to slide along the connecting rod 210, and the connecting block further pulls the connecting rope to bend the hose 310 used to connect the nozzle 320, so that the nozzle 320 can be cleaned for different surface areas.

[0058] The pre-oxidation furnace cleaning device 10 of the present application can enter the pre-oxidation furnace and effectively remove residual particulate matter on the inner wall of the pre-oxidation furnace and the internal diverter plate, saving a lot of manpower and improving the cleaning efficiency. After cleaning by the pre-oxidation furnace cleaning device 10 of the present application, there are fewer residual particulate matter on the inner wall of the alumina and the internal diverter plate, and the cleaning is more thorough.

[0059] See also Figure 3 The present application also provides a pre-oxidation furnace cleaning method using the pre-oxidation furnace cleaning device 10 in the above embodiment, which comprises the following steps:

[0060] S1. Use high pressure water to clean

[0061] The pre-oxidation furnace cleaning device 10 is placed in the pre-oxidation furnace, and the water pipe connected to the water source is connected to the medium inlet 111 through the water-gas switching valve 500. The high-pressure water flow passes through the first medium channel, the second medium channel and the hose 310 in sequence, and is finally sprayed out by the nozzle 320. The high-pressure water flow is used to flush the lumps and scattered particles gathered and adsorbed on the inner wall of the pre-oxidation furnace and the internal diverter plate. The cleaned particles are discharged from the furnace body through the drain hole of the pre-oxidation furnace along with the water flow.

[0062] Optionally, the pressure of the high-pressure water flow is ≥0.4Mpa.

[0063] It should be noted that the pre-oxidation furnace cleaning device 10 moves the pre-oxidation furnace cleaning device 10 to different positions in the pre-oxidation furnace by means of the horizontal moving motor 140 and the lifting motor 120. At the same time, by controlling the sliding block 220 to slide on the connecting rod 210, the first connecting rope 330 pulls up the nozzle 320, and the hose 310 bends to change the spray angle of the nozzle 320, and the nozzle 320 sprays the cleaning medium to clean different areas of the pre-oxidation furnace.

[0064] S2. Cleaning with high pressure gas

[0065] The gas pipe connected to the gas source is connected to the medium inlet 111 through the water-gas switching valve 500, and the high-pressure airflow passes through the first medium channel, the second medium channel and the hose 310 in sequence, and is finally ejected from the nozzle 320. The high-pressure gas is used to clean the residual water, particulate matter and the mixture of water and particulate matter in the furnace chamber of the pre-oxidation furnace to ensure that there is no water, particulate matter and the mixture of water and particulate matter in the pre-oxidation furnace.

[0066] Optionally, the pressure of the high-pressure gas is ≥0.6Mpa.

[0067] S3, Drying

[0068] After cleaning is completed, the water-gas switching valve 500 is controlled so that the medium inlet 111 is not connected to the gas source and the water source, the drying temperature is set to ≥80°C, the drying time is set to ≥8h, the inside of the pre-oxidation furnace is dried, and the water vapor is discharged by increasing the output of the exhaust fan and the circulating fan.

[0069] Optionally, the drying temperature is 80° C. to 120° C., and the drying time is 8 h to 12 h.

[0070] The pre-oxidation furnace cleaning method of the present application is simple and convenient, and the cleaning efficiency is improved. After cleaning, there are fewer particles remaining in the inner wall of the alumina and the internal diverter plate, and the cleaning is more thorough.

[0071] The above description is only a specific embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pre-oxidation furnace cleaning device, characterized in that: The pre-oxidation furnace cleaning device comprises: A frame, the frame comprising a support member, the support member having an internal first medium channel and a medium inlet connected to the first medium channel; A lifting mechanism, the lifting mechanism comprising a connecting rod and a sliding block, the connecting rod having an internal second medium channel, one end of the connecting rod being connected to the supporting member, and the second medium channel being connected to the first medium channel, the sliding block being sleeved on the connecting rod and being able to slide along the connecting rod; The cleaning mechanism comprises a hose, a nozzle and a first connecting rope, one end of the hose is connected to the other end of the connecting rod, and the hose is connected to the second medium channel, the other end of the hose is connected to the nozzle, and the nozzle is connected to the sliding block through the first connecting rope.

2. The pre-oxidation furnace cleaning device according to claim 1, characterized in that: The pre-oxidation furnace cleaning device comprises a plurality of lifting mechanisms and a plurality of cleaning mechanisms, wherein the plurality of lifting mechanisms are connected to the supporting member in parallel and at intervals, and the plurality of lifting mechanisms and the plurality of cleaning mechanisms are connected correspondingly.

3. The pre-oxidation furnace cleaning device according to claim 1, characterized in that: The nozzle has a rotatable spray port.

4. The pre-oxidation furnace cleaning device according to claim 1, characterized in that: The lifting mechanism also includes a rotating motor and a second connecting rope, wherein the rotating motor is connected to the supporting member, the rotating motor is connected to one end of the second connecting rope and controls the winding of the second connecting rope, and the other end of the second connecting rope is connected to the sliding block.

5. The pre-oxidation furnace cleaning device according to claim 4, characterized in that: The lifting mechanism further comprises a solenoid valve, which is connected to the support member and is used to control the opening and closing of the rotating motor.

6. The pre-oxidation furnace cleaning device according to claim 1, characterized in that: The frame also includes a lifting motor and a first threaded rod, the outer wall of the first threaded rod has an external thread, the lifting motor is arranged at one end of the first threaded rod, the end of the support member is provided with a first connecting member, the first connecting member has a first through hole, the inner wall of the first through hole has an internal thread, the support member is sleeved on the first threaded rod through the first connecting member, and the first connecting member is threadedly matched with the first threaded rod.

7. The pre-oxidation furnace cleaning device according to claim 6, characterized in that: A limit sensor is arranged on one side of the support member close to the lifting mechanism.

8. The pre-oxidation furnace cleaning device according to claim 6, characterized in that: The frame also includes a horizontal movement motor and a second threaded rod, the outer wall of the second threaded rod has an external thread, the horizontal movement motor is arranged at one end of the second threaded rod, the other end of the first threaded rod is provided with a second connecting piece, the second connecting piece has a second through hole, the inner wall of the second through hole has an internal thread, the first threaded rod is sleeved on the second threaded rod through the second connecting piece, and the second connecting piece is threadably matched with the second threaded rod.

9. The pre-oxidation furnace cleaning device according to claim 1, characterized in that: The pre-oxidation furnace cleaning device also includes a water-gas switching valve, a water pipe for connecting to a water source, and an air pipe for connecting to an air source. Both the water pipe and the air pipe are connected to the medium inlet through the water-gas switching valve.

10. A method for cleaning a pre-oxidation furnace using the pre-oxidation furnace cleaning device according to any one of claims 1 to 9, characterized in that: The pre-oxidation furnace cleaning method includes: placing the pre-oxidation furnace cleaning device in the pre-oxidation furnace, introducing liquid and / or gas into the medium inlet, the liquid and / or gas sequentially passes through the first medium channel, the second medium channel and the hose to reach the nozzle, by controlling the sliding block to slide on the connecting rod, the first connecting rope pulls up the nozzle, the hose bends to change the spray angle of the nozzle, and the nozzle sprays liquid and / or gas to clean different areas of the pre-oxidation furnace.

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