Method for replacing stirring rod in hot state

Abstract

The invention relates to the field of TFT-LCD (Thin Film Transistor Liquid Crystal Display) substrate glass production, in particular to a method for replacing a stirring rod in a hot state. S1, stopping after marking the original position of the stirring mechanism, and dismounting a connecting part and a heat preservation structure; s2, driving the stirring rod to move through a lifting device until the stirring rod is separated from the stirring tank, and mounting a preheating follow-up device on the stirring rod for heat preservation in the moving process; s3, the stirring rod is replaced through a swing arm device, a preheating follow-up device is installed on the replaced stirring rod, and the replaced stirring rod is preheated to the preset temperature through the preheating follow-up device; and S4, driving the replaced stirring rod to descend to the stirring tank through the lifting device, centering and recovering the connecting part and the heat preservation structure. Through cooperation of all the devices, the safety and high efficiency of the stirring tank in the replacement process are ensured, the contact time of molten glass and the external environment is further shortened, heat loss is avoided, and therefore stable operation of a production line and the product quality are maintained.

Description

Technical Field

[0001] The present invention relates to the field of TFT-LCD substrate glass production, and particularly to a method for replacing a stirring rod in a hot state. Background Art

[0002] In the production process of TFT-LCD (Thin Film Transistor-Liquid Crystal Display) substrate glass, in order to ensure the high-quality homogenization of the glass liquid, the stirrer plays a key role. The stirrer can ensure that the glass liquid is fully mixed during the melting and homogenization processes, so as to meet the standards. As a core operating component in the stirrer, the normal operation of the stirring rod is directly related to the efficiency of the entire production line and the product quality.

[0003] However, in the actual production process, various abnormal conditions may occur in the stirrer, such as damage to the stirring rod. In order to ensure the continuity and stability of production, once an abnormality occurs in the stirrer, it is necessary to quickly replace the stirring rod. However, in the hot state, the overall temperature of the equipment is relatively high, and the humidity of the production environment of the equipment is relatively large, which will increase the risk of scalding for the operator during the hot-state replacement process. In addition, the high-humidity environment will cause the operator's hands to be slippery, increasing the risk of operation errors. In addition, the self-weight of the stirring rod is relatively large, which makes the operator not only take a long time but also have a low replacement efficiency, further increasing the burden on the operator. Finally, the replaced stirring rod needs to be preheated for a long time, and the temperature of the glass liquid in the stirring tank will fluctuate, resulting in a sudden drop in the local temperature, leading to defects in the quality of the glass liquid. Summary of the Invention

[0004] Aiming at the problems mentioned in the prior art, the present invention proposes a method for replacing a stirring rod in a hot state, which is realized by a preheating follower device, a lifting device and a swing arm device installed on the stirring mechanism, and solves the problems of long time consumption during the replacement of the stirring rod, difficult replacement for the operator due to the high temperature of the stirring rod itself and the high environmental temperature and humidity, and the need for long-time preheating of the replaced stirring rod.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A method for replacing a stirring rod in a hot state according to the present invention is realized by a preheating follower device and a lifting device and a swing arm device installed on the stirring mechanism. The method comprises the following steps: S1. After marking the original position of the stirring mechanism, stop the machine and remove the connecting components and the heat preservation structure; S2. Drive the stirring rod to move until it disengages from the stirring tank through the lifting device, and perform heat preservation on the stirring rod by installing a preheating follower device during the movement; S3. Replace the stirring rod through the swing arm device, install a preheating follow-up device on the replaced stirring rod, and preheat the replaced stirring rod to a predetermined temperature through the preheating follow-up device; S4. Drive the replaced stirring rod to descend to the stirring tank through the lifting device, align it, and then restore the connecting components and the heat preservation structure to complete the hot replacement of the stirring rod.

[0006] As a further improvement of the present invention, the connecting components in S1 include a chain provided outside the stirring tank, a cooling air duct arranged around the outer wall of the stirring tank, and a heater installed on the top of the stirring tank; The heat preservation structure includes an outer heat preservation layer of the stirring tank and a heating matrix brick on the top of the stirring tank.

[0007] As a further improvement of the present invention, the preheating follow-up device includes a heat preservation housing and a heating element. At least one heating element is arranged in the heat preservation housing, and the heat preservation housing is a flexible structure and can be sleeved on the surface of the stirring rod.

[0008] As a further improvement of the present invention, the flexible structure includes a first cloth layer, a ceramic fiber blanket layer, and a second cloth layer arranged in sequence from the inside to the outside; The first cloth layer, the ceramic fiber blanket layer, and the second cloth layer are sewn together by glass fiber.

[0009] As a further improvement of the present invention, the heating element is a silicon carbide rod, and the silicon carbide rod is arranged between the ceramic fiber blanket layer and the first cloth layer.

[0010] As a further improvement of the present invention, after S2, a transition brick, a heat preservation blanket, and a heat preservation board are installed on the top of the stirring tank in sequence from bottom to top.

[0011] As a further improvement of the present invention, the replacement of the stirring rod is realized through the swing arm device, and the specific process is as follows: Connect the swing arm device to the stirring rod and remove the fixing bolts at the bottom of the stirring rod. Rotate the swing arm device to drive the stirring rod to move to a suitable position, and then remove the stirring rod; Connect the swing arm device to the stirring rod to be replaced, rotate the swing arm device to move the stirring rod to be replaced to the installation position, and install the stirring rod to be replaced on the stirring mechanism.

[0012] As a further improvement of the present invention, before S4, the heat preservation board, the heat preservation blanket, and the transition brick are removed in sequence.

[0013] As a further improvement of the present invention, when the replaced stirring rod is driven to descend by the lifting device in S4, the preheating follow-up device is stacked on the top of the stirring tank.

[0014] As a further improvement of the present invention, after S4, the replaced stirring rod is gradually restored to the preset rotation speed.

[0015] The present invention has achieved the following technical effects compared with the prior art: By integrating the coordinated operation of the preheating follow-up device, the lifting device, and the swing arm device, the present invention realizes the safe replacement of the stirring rod in the high-temperature and high-humidity environment of TFT-LCD substrate glass production, thereby improving production continuity and product quality; the preheating follow-up device of the present invention ensures that the stirring rod is always within a suitable temperature range during the replacement process through heat preservation and heating, reducing problems such as cracks and deformation of the stirring rod caused by temperature differences; the lifting device of the present invention controls the vertical displacement of the stirring rod, enabling the stirring rod to quickly disengage from or reset to the stirring tank, greatly shortening the manual operation time and reducing the risk of operators being exposed to high-risk environments; the swing arm device of the present invention replaces the traditional manual handling with a mechanized process, not only solving the problem of low replacement efficiency caused by the large self-weight of the stirring rod. The method of the present invention ensures the safety and high efficiency during the replacement process of the stirring rod through the cooperation of various devices, reduces the contact time between the molten glass and the external environment, and avoids heat dissipation, thereby maintaining the stable operation of the production line.

[0016] The preheating follow-up device of the present invention adopts a multi-layer composite structure combined with embedded heating of silicon carbide rods to achieve uniform heating of the stirring rod in all directions. At the same time, the flexible design can closely fit the surface of the stirring rod, enhancing the sealing performance and heat preservation efficiency; the preheating follow-up device of the present invention not only solves the problems of high equipment temperature and large heat radiation, making it difficult for personnel to operate at close range, ensuring the safety of personnel operation, but also can preheat the new stirring rod before it enters the molten glass, avoiding temperature difference problems of the new stirring rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the preheating follow-up device of the present invention; Figure 2 It is a schematic structural diagram of the lifting device of the present invention; Figure 3 It is a schematic structural diagram of the swing arm device of the present invention; Figure 4 It is a schematic flow diagram of the hot-state replacement of the stirring rod of the present invention.

[0018] Reference numerals: 1, clamp; 2, heat preservation housing; 3, heating element; 4, temperature measurement port; 5, intermediate slide plate; 6, motor mounting bracket; 7, upper slide plate; 8, hand crank; 9, motor; 10, coupling; 11, input shaft of the reversing speed reducer; 12, reversing speed reducer; 13, output shaft of the reversing speed reducer; 14, reversing speed reducer bracket; 15, rotating member; 16, fixing plate; 17, swing arm; 18, connecting plate; 19, fastener. DETAILED DESCRIPTION OF THE INVENTION

[0019] In the following text, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the accompanying drawings and the description are considered to be exemplary in nature rather than restrictive.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0021] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0024] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0025] It should also be understood that the terms used in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0026] It should be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] Various schematic structural diagrams according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are merely exemplary, and may actually deviate due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0028] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0029] As Figure 4 shown, a method for hot-state replacement of a stirring rod according to the present invention is realized by preheating a follow-up device and a lifting device and a swing arm device installed on a stirring mechanism. The method includes the following steps: S1. After marking the original position of the stirring mechanism, stop the machine and remove the connecting components and the heat preservation structure; S2. Drive the stirring rod to move until it disengages from the stirring tank through the lifting device, and keep the preheating follow-up device installed on the stirring rod insulated during the movement; S3. Replace the stirring rod through the swing arm device, install the preheating follow-up device on the replaced stirring rod, and preheat the replaced stirring rod to a predetermined temperature through the preheating follow-up device; S4. Drive the replaced stirring rod to descend into the stirring tank through the lifting device, align it, and restore the connecting components and the heat preservation structure to complete the hot-state replacement of the stirring rod.

[0030] As Figure 1As shown in the figure, the preheating follow-up device of this embodiment includes a heat-insulating outer shell 2. A plurality of heating elements 3 are arranged inside the heat-insulating outer shell 2. The heat-insulating outer shell 2 is integrally made of a flexible structure, so the heat-insulating outer shell 2 can fit the stirring rod and wrap the stirring rod.

[0031] Figure 1 As shown in the figure, in the embodiment, opening and closing seams are provided on both the side and bottom of the heat-insulating outer shell 2, and the opening and closing seams can be joined by fiberglass; a fixing member is provided at the top of the heat-insulating outer shell 2. The fixing member is used to fix the heat-insulating outer shell 2 at the flange at the top of the stirring rod to realize the connection with the stirring rod; the fixing member is preferably a clamp 1, and the clamp 1 is fixed by the cooperation of screws and nuts, but is not limited thereto. Different fixing members can be selected according to different usage scenarios.

[0032] The heat-insulating outer shell 2 in the embodiment includes a first cloth layer, a ceramic fiber blanket layer, and a second cloth layer arranged in sequence from the inside to the outside. The first cloth layer and the second cloth layer are preferably high-silica cloth, and the ceramic fiber blanket layer is preferably a 1600-type ceramic fiber blanket. Both the high-silica cloth and the 1600-type ceramic fiber blanket are high-temperature refractory materials, which can improve the heat insulation effect when wrapping the stirring rod and prevent the stirring rod from causing harm to the operator; a plurality of temperature measurement ports 4 are also provided on the surface of the heat-insulating outer shell 2. Each temperature measurement port 4 is used to insert a thermocouple. The diameter of the temperature measurement port 4 is preferably 5 mm. The heating temperature of the heating element 3 can be measured by the thermocouple to control the preheating temperature and ensure that the stirring rod is always within a suitable temperature range; in the embodiment, the heating element 3 is preferably a silicon carbide rod.

[0033] As Figure 2 shown in the figure, the lifting device in the embodiment includes a coupling 10, a motor mounting bracket 6, a motor 9, and a hand crank 8; one end of the coupling 10 is connected to the input shaft 11 of the reversing speed reducer of the stirring mechanism, and the other end is connected to the output shaft of the motor 9; the motor mounting bracket 6 is connected to the intermediate slide plate 5 of the stirring mechanism by screws and is also connected to the upper slide plate 7 of the stirring mechanism by screws; the hand crank 8 of the embodiment replaces the cooling fan at the input end of the original stirring mechanism motor and is installed on the shaft of the cooling fan at the input end of the motor. Therefore, two modes of manually cranking or automatically lifting the stirring mechanism can be used.

[0034] The motor 9 is fixed on the motor mounting bracket 6. The model of the motor 9 is preferably Y290L-4. The motor 9 is connected to an electrical control cabinet panel. A forward / reverse selection switch of the motor 9 is installed on the electrical control cabinet panel. The switch signal of the motor 9 is connected to the input of the frequency converter of the mixer. The frequency converter is used to drive the motor 9 to rotate forward and backward to realize the automatic lifting of the mixer; the hand crank 8 can be used to manually lift the stirring mechanism when manual lifting is required.

[0035] The working principle is to rotate the motor 9 by manually turning the hand crank 8 or directly energizing it. The rotating motor 9 drives the input shaft 11 of the reversing speed reducer of the stirring mechanism to rotate through the coupling 10. The rotation of the input shaft 11 of the reversing speed reducer drives the reversing speed reducer 12 installed on the reversing speed reducer bracket 14 to rotate. The reversing speed reducer 12 drives the output shaft 13 of the reversing speed reducer to rotate. The output shaft 13 of the reversing speed reducer drives the lifting lead screw to rotate, and the rotation of the lifting lead screw drives the lifting of the stirring mechanism.

[0036] As Figure 3 shown, the swing arm device in the embodiment includes a rotating member 15, a fixing plate 16, a swing arm 17, a connecting plate 18, and a fastening member 19. Among them, the fixing plate 16 is connected to one end of the swing arm 17 through the rotating member 15. A connecting plate 18 is provided at the other end of the swing arm 17. The fastening member 19 can clamp or loosen the stirring rod to be replaced along the circumferential direction of the stirring rod to be replaced. In the embodiment, the rotating member 15 is preferably a rotating shaft. The fastening member 19 includes a matching fastening collar and a locking member. After the connecting plate 18 is buckled on the stirring rod to be replaced, the fastening collar is put on and locked through the locking member, so that the swing arm 17 clamps the stirring rod to be replaced for replacement operation.

[0037] The working principle is to install the fixing plate 16 on the tripod of the stirring mechanism, clamp the stirring rod to be replaced through the connecting plate 18 and the fastening member 19, and the swing arm 17 can be rotated under the action of the rotating member 15. After moving the stirring rod to be replaced to a suitable position, the stirring rod is installed on the stirring mechanism.

[0038] As Figure 4 shown, the present invention proposes a method for hot-state replacement of the stirring rod, including the following steps: Step 1: Mark the original position of the stirring mechanism and then stop the machine. Specifically, before the stirring mechanism stops, record the real-time operating parameters of the stirring mechanism through the control system, including the height, tilt angle of the stirring rod, and the vertical alignment accuracy lamp with the stirring tank. After confirming that the parameters are correct, turn off the power switch of the stirring mechanism; this step can provide data for the subsequent reset of the replaced stirring rod to ensure that the position of the replaced stirring rod is the same as the original position.

[0039] Remove the connecting components: To remove the chain, use a special wrench to loosen the chain fixing bolts at the top of the stirring mechanism and disassemble the chain in sections; to remove the cooling air duct, remove the flange bolts of the cooling air duct connecting the stirring tank and use a lifting device to move out the cooling air duct; to remove the top heater, disconnect the power supply wire of the heater and move the heater away from the top of the stirring tank.

[0040] Remove the insulation structure: Remove the insulation layer outside the stirring tank and the heating matrix bricks on the top of the stirring tank. Removing the connecting components can expose the opening at the top of the stirring tank, and at the same time stack the preheating follow-up device on the opening at the top of the stirring tank. Step 2: Use the lifting device to drive the stirring rod out of the stirring tank. First, achieve automatic rising through the motor 9 of the lifting device. When the top of the stirring rod disengages from the stirring tank, fix the top of the heat preservation shell 2 at the flange at the top of the stirring rod through the clamp 1. After the stirring rod completely disengages from the stirring tank, slip the heat preservation shell 2 onto the top of the stirring rod from top to bottom to wrap the stirring rod. At the same time, join the opening and closing seam of the heat preservation shell 2 with fiberglass for complete wrapping operation. Before joining, it is necessary to clean the residual drawn glass on the surface of the stirring rod; the heat preservation shell 2 can not only isolate the external heat dissipation but also achieve uniform heating through the silicon carbide rod to maintain heat preservation.

[0041] When the stirring rod rises to a certain height, switch the working mode of the lifting device and manually drive the stirring rod to the designated position through the hand crank 8.

[0042] After the stirring rod disengages from the stirring tank, it is necessary to install temporary heat preservation measures. Specifically, lay transition bricks at the opening at the top of the stirring tank. The transition bricks are zirconia ceramics; lay a heat preservation blanket on the surface of the transition bricks. The heat preservation blanket is preferably a multi-layer ceramic fiber blanket; install a composite heat preservation board outside the heat preservation blanket. The outer layer of the composite heat preservation board is a stainless steel plate, and the inner layer is a ceramic fiber board. The composite heat preservation board is connected to the top of the stirring tank through bolts. The heat preservation measures can reduce the heat dissipation of the stirring tank and maintain the temperature stability of the glass liquid.

[0043] Step 3: After lowering the stirring rod to an appropriate position through the lifting device, connect the swing arm device to the stirring rod. Specifically, install the fixing plate 16 on the tripod of the stirring mechanism, clamp the connecting plate 18 along the circumference of the stirring rod and fix it with the fastener 19. Slowly rotate the swing arm 17, and under the action of the rotating part 15, the movement of the stirring rod is realized; remove the fixing bolts at the bottom of the stirring rod and place the removed stirring rod on the special platform.

[0044] Connect and fix the stirring rod to be replaced with the swing arm device, rotate the swing arm device to move the stirring rod to be replaced to the installation position, and install the stirring rod to be replaced on the stirring mechanism.

[0045] Install a preheating follow-up device for the replaced stirring rod. After wrapping the replaced stirring rod with the heat preservation shell 2 and joining it, preheat the replaced stirring rod to the set temperature by using the heating element 3. Subsequently, lower the replaced stirring rod to the top of the stirring tank through the lifting device to ensure that the center of the opening at the top of the replaced stirring rod coincides with the center of the opening at the top of the stirring tank.

[0046] Step 4: Remove the heat preservation board and the heat preservation blanket in sequence and remove the transition bricks. Start the lifting device, drive the replaced stirring rod to descend into the stirring tank through the motor 9, and open the opening and closing seam at the bottom of the heat preservation shell 2. During the descent, the heat preservation shell 2 will stack at the opening at the top of the stirring tank.

[0047] After the replaced stirring rod descends into the stirring tank for a period of time, switch the hand crank 8 and turn it by hand to make the replaced stirring rod descend to the original position. Then reinstall the heat preservation structure and connecting components outside the stirring tank to gradually restore the replaced stirring rod to the preset rotation speed, thus completing the entire operation of replacing the stirring rod.

[0048] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention. Any reference signs in the claims should not be construed as limiting the claimed invention.

[0049] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A method for replacing a stirring rod in a hot state, characterized in that, It is achieved by a preheating follow-up device, a lifting device and a swing arm device installed on the stirring mechanism. The method includes the following steps: S1. After marking the original position of the stirring mechanism, stop the machine and remove the connecting components and the heat preservation structure. S2. Drive the stirring rod to move through the lifting device until it disengages from the stirring tank. During the movement, install a preheating follow-up device on the stirring rod for heat preservation. S3. Replace the stirring rod through the swing arm device. Install a preheating follow-up device on the replaced stirring rod, and preheat the replaced stirring rod to a predetermined temperature through the preheating follow-up device. S4. Drive the replaced stirring rod to descend into the stirring tank through the lifting device, align it, and restore the connecting components and the heat preservation structure to complete the hot replacement of the stirring rod.

2. The method for hot-state replacement of a stirring rod according to claim 1, wherein The connecting components in S1 include a chain arranged outside the stirring tank, a cooling air duct arranged around the outer wall of the stirring tank, and a heater installed on the top of the stirring tank. The heat preservation structure includes an outer heat preservation layer of the stirring tank and a heating matrix brick on the top of the stirring tank.

3. The method for hot-state replacement of a stirring rod according to claim 1, wherein The preheating follow-up device includes a heat preservation shell and a heating element. At least one heating element is arranged in the heat preservation shell, and the heat preservation shell is a flexible structure and can be sleeved on the surface of the stirring rod.

4. The method for replacing a stirring rod in a hot state according to claim 3, wherein, The flexible structure includes a first cloth layer, a ceramic fiber blanket layer and a second cloth layer arranged in sequence from inside to outside. The first cloth layer, the ceramic fiber blanket layer and the second cloth layer are sewn together by glass fiber.

5. The method for hot-state replacement of a stirring rod according to claim 3, characterized in that The heating element is a silicon carbide rod, and the silicon carbide rod is arranged between the ceramic fiber blanket layer and the first cloth layer.

6. The method for hot-state replacement of a stirring rod according to claim 1, wherein After S2, a transition brick, a heat preservation blanket and a heat preservation board are installed on the top of the stirring tank in sequence from bottom to top.

7. The method for hot-state replacement of a stirring rod according to claim 1, characterized in that, The replacement of the stirring rod is realized through the swing arm device. The specific process is as follows: Connect the swing arm device to the stirring rod and remove the fixing bolts at the bottom of the stirring rod. Rotate the swing arm device to drive the stirring rod to move to a suitable position and remove the stirring rod. Connect the swing arm device to the stirring rod to be replaced, rotate the swing arm device to move the stirring rod to be replaced to the installation position, and install the stirring rod to be replaced on the stirring mechanism.

8. The method for replacing a stirring rod in a hot state according to claim 6, wherein, Before S4, remove the heat preservation board, the heat preservation blanket and the transition brick in sequence.

9. The method for replacing the stirring rod in a hot state according to claim 1, wherein When the replaced stirring rod is driven to descend through the lifting device in S4, the preheating follow-up device is stacked on the top of the stirring tank.

10. The method for replacing the stirring rod in a hot state according to claim 1, characterized in that After S4, gradually restore the replaced stirring rod to the preset rotation speed.

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