Automatic production and manufacturing process of PTC (Positive Temperature Coefficient) ceramic material

Abstract

The invention discloses an automatic production and manufacturing process of a PTC ceramic material, which comprises the steps of weighing, primary mixing, spray drying, powder burning, secondary ball milling, slurry adjustment, spray granulation and the like, traditional 11 procedures are adjusted into 7 procedures, the processing period is shortened, through automatic implementation, the labor cost of the whole ceramic material preparation procedure is reduced by more than half, and the production efficiency is greatly improved. The labor efficiency can be improved by more than one time on the basis of the traditional process, the manufacturing process is shortened by about 50%, the yield is improved by about 10%, and the pollutant emission is reduced by 90%. Pollution of environmental impurities to the porcelain in the production process is avoided to the greatest extent, and the quality of the porcelain is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of thermistors, and in particular relates to an automated production process for PTC ceramic materials. Background Art

[0002] There are usually 11 preparation steps in the preparation of thermistor ceramics.

[0003] At present, the preparation process of thermistor porcelain materials in China includes 11 steps including weighing, primary mixing, filter pressing, drying, rolling, briquetting, sintering, rolling, secondary grinding, slurry adjustment, and spray granulation. The process of porcelain material preparation: 1) weighing various raw materials; 2) putting the weighed raw materials into a mixing tank pre-filled with deionized water in a certain order for thorough mixing and ball milling; 3) filtering the fully mixed primary slurry through a filter press to form a cake; 4) moving the filtered cake to a special oven for drying; 5) moving the dried cake to a roller mill for crushing; 6) pouring the crushed porcelain into a briquetting machine and pressing it into a cylinder of a certain height and weight; 7) loading the pressed porcelain block into a corundum sagger for pre-sintering synthesis; 8) crushing the pre-sintered porcelain through a roller mill; 9) crushing the pre-sintered porcelain block and loading it into a ball mill for secondary grinding; 10) moving the ball-milled secondary slurry to a special secondary material slurry storage tank, then adding some corresponding chemical reagents and stirring thoroughly; 11) spray granulating the adjusted slurry. In the current domestic preparation process of thermistor ceramic materials, there are not only many preparation processes, but each process requires manual work, which will bring a series of problems: low efficiency, unstable quality of ceramic materials, high costs, and potential safety hazards. It takes a lot of time to transport materials between each process, which will lead to poor continuity between processes, long ceramic production cycle, and low output efficiency. There are risks of ceramic material loss and contamination when transporting between processes.

[0004] In the preparation process of traditional thermistor porcelain materials, the filter pressing process will produce a large amount of industrial wastewater. With the continuous increase in production capacity, the daily amount of wastewater generated exceeds the existing wastewater treatment capacity, so it is necessary to improve it. Summary of the invention

[0005] In order to overcome the above shortcomings, an automated production process for PTC porcelain is proposed, which adjusts the traditional 11 processes to 7 processes, shortens the processing cycle, and through the implementation of automation, the labor cost of the entire process of porcelain preparation will be reduced by more than half, and the labor efficiency can be increased by more than 1 times on the basis of the traditional process, the manufacturing process is shortened by about 50%, the output rate is increased by about 10%, and the pollution emission is reduced by 90%. The pollution of environmental impurities to porcelain during the production process is avoided to the greatest extent, and the quality of porcelain is further improved.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is to provide an automated production process for PTC ceramics. The steps include: S1, weighing: weighing materials and feeding; S2, primary mixing: setting the mixing time and ball milling time of the primary material, mixing and ball milling to obtain slurry; S3, spray drying: the slurry is transported to the storage tank of the spray drying tower through a fully enclosed pipeline, and then spray dried after slurry adjustment; S4, powder burning: the spray-dried porcelain material is transported to the powder burning furnace through a fully enclosed pipeline. After the powder burning is completed, the pre-burned porcelain material is moved to the storage bin; S5, secondary ball milling: The porcelain material in the storage bin is transported to the secondary material ball mill slurry tank through a fully enclosed pipeline, and the secondary ball milling is carried out after the secondary ball milling time is set; S6, slurry adjustment: after the secondary ball milling is completed, the slurry is transported to the storage tank of the spray granulation tower through a fully enclosed pipeline for slurry adjustment; S7, spray granulation: after the equipment is preheated, relevant parameters are set and then spray granulation is carried out, the parameters include inlet air temperature, exhaust air temperature, negative pressure in the tower, feed speed, and atomizer frequency.

[0007] According to the automated production process of PTC porcelain materials described in the present invention, a further preferred technical solution is: in step S1, the mixing time of the primary material is 3h-5h, and the ball milling time is 9h-15h. After the mixing is completed, it is automatically switched to the ball milling mode to perform the primary ball milling of the slurry.

[0008] According to the automated production process for PTC porcelain materials described in the present invention, a further preferred technical solution is: in step S3, the slurry is adjusted by adding an adhesive at a ratio of 0.18L / kg-0.25L / kg according to the feed amount, and the adhesive is automatically added to the storage tank of the spray drying tower through a pipeline, and then stirred for 6h-10h. After the stirring is completed, it is automatically switched to the spray drying mode for spray drying.

[0009] According to the automated production process of PTC porcelain materials described in the present invention, a further preferred technical solution is: before spray drying, various parameters are set: inlet air temperature 245°C-290°C, exhaust air temperature 110°C-150°C, negative pressure in the tower -0.04KPa-0KPa, atomizing disk speed 7000-10000 rpm, and feeding speed 40%-55%.

[0010] According to the automated production process for PTC porcelain materials described in the present invention, a further preferred technical solution is: in step S5, the mixing time of the secondary material is 2h-4h, and the ball milling time is 6h-10h. After the mixing is completed, the mode is automatically switched to the ball milling mode to perform secondary ball milling of the slurry.

[0011] According to the automated production process for PTC porcelain materials described in the present invention, a further preferred technical solution is: in step S6, the slurry is adjusted by adding auxiliary materials at a ratio of 0.18L / kg-0.25L / kg according to the feed amount, and the adhesive is automatically added to the storage tank of the spray granulation tower through a pipeline, and then stirred for 8h-10h. The auxiliary materials include adhesives, dispersants, defoamers and plasticizers.

[0012] According to the automated production process of PTC porcelain materials described in the present invention, a further preferred technical solution is: in step S7, before spray granulation, various parameters are set: inlet air temperature 260°C-280°C, exhaust air temperature 120°C-140°C, negative pressure in the tower -0.03KPa-0KPa, atomizing disk speed 9000-11000 rpm, and feeding speed 45%-55%.

[0013] According to the automated production process for PTC porcelain materials of the present invention, a further preferred technical solution is: using a tuning fork sensing system to determine whether the discharge of the slurry transported by a fully enclosed pipeline is completed each time.

[0014] According to the automated production process for PTC porcelain materials of the present invention, a further preferred technical solution is that in step S4, porcelain materials are added to the sagger during powder firing, and the amount of porcelain materials added accounts for 90% of the volume of the sagger.

[0015] According to the automated production process for PTC porcelain materials of the present invention, a further preferred technical solution is that after the porcelain powder is pre-sintered, the material is unloaded once every 12-15 minutes.

[0016] Compared with the prior art, the technical solution of the present invention has the following advantages / benefits: 1. In the present invention, the preparation of porcelain materials is automated, and all processes are connected by fully enclosed pipelines. The operating parameters of each process are set on a digital control console, and precise control is achieved at the same time. The transportation is convenient, the materials are basically not in contact with the outside world, the porcelain materials have basically no loss and risk of contamination, and the quality is stable and reliable.

[0017] 2. The fully automated processing technology is adopted, and each process is connected by an automated fully enclosed pipeline, which greatly improves the input-output ratio of porcelain materials from 75% of the traditional process to 85%. At the same time, automated iron removal, automated flushing and powder fully enclosed pipeline turnover are realized, which effectively reduces the introduction of impurities in the process and improves the consistency of product quality.

[0018] 3. Spray drying is used to dry the slurry, which basically does not discharge wastewater. While reducing environmental pollution, it also reduces the pressure and cost of wastewater treatment, making the economic benefits more obvious.

[0019] 4. Adjust the traditional 11 processes to 7 processes, shorten the processing cycle, and through the implementation of automation, the labor cost of the entire process of porcelain preparation will be reduced by more than half, and the labor efficiency can be increased by more than 1 times on the basis of the traditional process, the manufacturing process will be shortened by about 50%, the output rate will be increased by about 10%, and the pollution emissions will be reduced by 90%. The pollution of environmental impurities to porcelain during the production process is avoided to the greatest extent, and the quality of porcelain is further improved. The looseness of porcelain is 1.2-1.5g / cm3, the flow time is 45-50s, the D50 is 80-90μm, and the microscopic particle morphology of porcelain is full spherical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, 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 invention 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.

[0021] Figure 1 It is a structural schematic diagram of an automated production process for PTC porcelain materials of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in the subsequent drawings.

[0024] Embodiment 1: like Figure 1 As shown, an automated production process for PTC ceramic materials includes the following steps: S1, weighing: weighing materials and feeding them, and the feeding can be in an existing stirring tank or other corresponding devices and equipment; S2, primary mixing: setting the mixing time and ball milling time of the primary material, mixing and ball milling to obtain slurry; S3, spray drying: the slurry is transported to the storage tank of the spray drying tower through a fully enclosed pipeline, and then spray dried after slurry adjustment; S4, powder burning: the spray-dried porcelain material is transported to the powder burning furnace through a fully enclosed pipeline. After the powder burning is completed, the pre-burned porcelain material is moved to the storage bin. The outlet flow rate of the robot system adding porcelain material to the sagger is fixed. Therefore, by controlling the time (8s-12s) for the robot system to add porcelain material to the sagger, the loading amount of porcelain material in the sagger is controlled to account for 90% of the sagger volume. At this time, the powder burning effect is better and there will be no overflow during filling.

[0025] S5, secondary ball milling: The porcelain material in the storage bin is transported to the secondary material ball mill slurry tank through a fully enclosed pipeline, and the secondary ball milling is carried out after the secondary ball milling time is set; S6, slurry adjustment: after the secondary ball milling is completed, the slurry is transported to the storage tank of the spray granulation tower through a fully enclosed pipeline for slurry adjustment; S7, spray granulation: spray granulation. Turn on the equipment for preheating 2 hours before spray granulation; set parameters such as inlet air temperature, exhaust air temperature, negative pressure in the tower, feed speed and atomizer frequency; after the slurry adjustment is completed, the feed pipeline of the spray granulation tower automatically switches to the storage tank and starts spray granulation.

[0026] In step S1, the mixing time of the primary material is 3h-5h, and the ball milling time is 9h-15h. After the mixing is completed, the stirring tank automatically switches to the ball milling mode to perform the primary ball milling of the slurry.

[0027] In step S3, the slurry is adjusted specifically by adding an adhesive at a ratio of 0.18-0.25 L / kg according to the feed amount. The adhesive is automatically added to the storage tank of the spray drying tower through a pipeline, and then stirred for 6h-10h. After the stirring is completed, it is automatically switched to the spray drying mode for spray drying. During the stirring process, 1L of slurry can be measured to measure the slurry specific gravity, and then the stirring is resumed.

[0028] Before spray drying, set various parameters: inlet air temperature 245℃-290℃, exhaust air temperature 110℃-150℃, negative pressure in the tower -0.04KPa-0KPa, atomizing disk speed 7000-10000 rpm, and feeding speed 40%-55%.

[0029] In step S5, the mixing time of the secondary material is 2h-4h, and the ball milling time is 6h-10h. After the mixing is completed, the mode is automatically switched to the ball milling mode to perform secondary ball milling of the slurry.

[0030] In step S6, the slurry is adjusted by adding a binder at a ratio of 0.18-0.25 L / kg according to the feed amount, and the binder is automatically added to the storage tank of the spray granulation tower through a pipeline, and then stirred for 8h-10h.

[0031] In step S7, before spray granulation, various parameters are set: inlet air temperature 260°C-280°C, exhaust air temperature 120°C-140°C, negative pressure in the tower -0.03KPa-0KPa, atomizing disk speed 9000-11000 rpm, and feeding speed 45%-55%.

[0032] Embodiment 2: Some PTC ceramic material automated production and manufacturing processes, such as Figure 1 As shown, from the primary mixing process to the secondary material spray granulation process, all processes are connected by automated pipelines.

[0033] After weighing and feeding of various raw materials, 1) set the mixing time (3h) and ball milling time (10h) of the first material on the digital console. After the mixing is completed, it automatically switches to the ball milling mode to perform the first ball milling of the slurry. 2) After the ball milling is completed, it automatically switches to the discharging mode, and the slurry will be transported to the storage tank of the spray drying tower through a fully enclosed pipeline (the tuning fork sensing system is used to determine whether the first slurry discharge is completed). 3) According to the amount of feed, according to the proportion (the proportion of adhesive added: 0.20L / kg), set the amount of adhesive added on the digital console, and automatically add it to the storage tank through the pipeline. 4) Then set the stirring time (stirring time: 8h) on the digital console. After the stirring is completed, it automatically switches to the spray drying mode. 5) Before spray drying, set various parameters: inlet air temperature 270℃, exhaust air temperature 128℃, negative pressure in the tower -0.02KPa, atomizing disk speed 8000 rpm, feeding speed 45%-50%. 6) Through the vacuum feeding system, the spray-dried porcelain is transported to the porcelain powder storage tank through a fully enclosed pipeline (through the tuning fork sensing system, determine whether the porcelain is completely transported to the storage tank). 7) The porcelain is added to the sagger through the robot system, and the amount of porcelain added accounts for 90% of the volume of the sagger (the time for adding porcelain is set on the digital console for 8s-10s), and the tuning fork sensing system is used to determine whether the porcelain in the storage tank is completely loaded. 8) After the porcelain powder is pre-burned, the robot unloading program is set on the digital console, and the material is unloaded once every 12-14 minutes. 9) Set the robot feeding program on the digital console, and use the vacuum feeding system to transport the pre-burned porcelain to the secondary material ball mill slurry tank through a fully enclosed pipeline. 10) Set the mixing time (2h) and ball milling time (8h) of the secondary material on the digital console. After the mixing is completed, it automatically switches to the ball milling mode for secondary ball milling of the slurry. 11) After the ball milling is completed, it will automatically switch to the discharging mode, and the slurry will be transported to the storage tank of the spray granulation tower through a fully enclosed pipeline (the tuning fork sensing system is used to determine whether the slurry discharge is completed once). 12) According to the amount of feed, set the amount of adhesive added on the digital console according to the proportion (the proportion of adhesive added: 0.20L / kg), and automatically add it to the storage tank through the pipeline. 13) Then set the stirring time on the digital console (stirring time: 12h), and after the stirring is completed, it will automatically switch to the spray granulation mode. 14) Before spray granulation, set various parameters: inlet air temperature 270℃, exhaust air temperature 128℃, negative pressure in the tower -0.03KPa, atomizing disk speed 9000 rpm, feeding speed 46%-50%.

[0034] When there is slurry in the slurry tank, the mass and viscosity of the slurry will change the vibration frequency of the tuning fork sensing system at the bottom of the slurry tank. When the system senses that the change in vibration frequency reaches the set threshold, the switch outputs an electrical signal, triggering the tuning fork sensing system to open the valve. When the slurry in the slurry tank is delivered, the tuning fork sensing system at the bottom of the slurry tank will come into contact with the air, and its vibration frequency will also change accordingly. When the system senses that the change in vibration frequency reaches the set threshold, the switch outputs an electrical signal, triggering the tuning fork sensing system to close the valve.

[0035] A push-plate tunnel furnace is used for pre-firing of porcelain powder. The pushing speed in the tunnel furnace is set to 12-14 minutes / plate. One side of the tunnel furnace is the waiting area. When the tunnel furnace completes this action of 12-14 minutes / plate, the automation system will push the plate of porcelain out of the furnace to the waiting area. After this action is completed, the automatic system will give a unloading signal to the unloading robot, with an interval of 12-14 minutes (the actual unloading time takes 9-10 minutes to complete the unloading action).

[0036] Adjust the traditional 11 processes to 7 processes, shorten the processing cycle, and through the implementation of automation, the labor cost of the entire process of porcelain preparation will be reduced by more than half, and the labor efficiency can be increased by more than 1 times on the basis of the traditional process, the manufacturing process will be shortened by about 50%, the output rate will be increased by about 10%, and the pollution emissions will be reduced by 90%. The pollution of environmental impurities to porcelain during the production process can be avoided to the greatest extent, and the quality of porcelain can be further improved.

[0037] The fully automated processing technology path is adopted, and each process is connected by an automated fully enclosed pipeline, which greatly improves the input-output ratio of porcelain materials from 75% of the traditional process to 85%. At the same time, automated iron removal, automated flushing and powder fully enclosed pipeline turnover are realized, effectively reducing the introduction of impurities in the process and improving product quality consistency.

[0038] The looseness of the porcelain material is 1.2-1.4 g / cm3, the flow time is 47-50 s, the D50 is 80-90 μm, and the microscopic particle morphology of the porcelain material is full spherical.

[0039] Embodiment 3: Some PTC ceramic material automated production and manufacturing processes, such as Figure 1 As shown, from the primary mixing process to the secondary material spray granulation process, all processes are connected by automated pipelines.

[0040] After weighing and feeding of various raw materials, 1) set the mixing time (4h) and ball milling time (12h) of the first material on the digital console. After the mixing is completed, it automatically switches to the ball milling mode to perform the first ball milling of the slurry. 2) After the ball milling is completed, it automatically switches to the discharging mode, and the slurry will be transported to the storage tank of the spray drying tower through a fully enclosed pipeline (the tuning fork sensing system is used to determine whether the first slurry discharge is completed). 3) According to the amount of feed, according to the proportion (the proportion of adhesive added: 0.22L / kg), set the amount of adhesive added on the digital console, and automatically add it to the storage tank through the pipeline. 4) Then set the stirring time (stirring time: 9h) on the digital console. After the stirring is completed, it automatically switches to the spray drying mode. 5) Before spray drying, set various parameters: inlet air temperature 275℃, exhaust air temperature 130℃, negative pressure in the tower -0.03KPa, atomizing disk speed 8500 rpm, feeding speed 45%-48%. 6) Through the vacuum feeding system, the spray-dried porcelain is transported to the porcelain powder storage tank through a fully enclosed pipeline (through the tuning fork sensing system, determine whether the porcelain is completely transported to the storage tank). 7) The porcelain is added to the sagger through the robot system, and the amount of porcelain added accounts for 90% of the volume of the sagger (the time for adding porcelain is set on the digital console for 8s-9s), and the tuning fork sensing system is used to determine whether the porcelain in the storage tank is fully loaded. 8) After the porcelain powder is pre-burned, the robot unloading program is set on the digital console, and the material is unloaded once every 13-14 minutes. 9) The robot feeding program is set on the digital console, and the pre-burned porcelain is transported to the secondary material ball mill slurry tank through a fully enclosed pipeline through the vacuum feeding system. 10) The mixing time (3h) and ball milling time (9h) of the secondary material are set on the digital console. After the mixing is completed, it automatically switches to the ball milling mode for secondary ball milling of the slurry. 11) After the ball milling is completed, it will automatically switch to the discharging mode, and the slurry will be transported to the storage tank of the spray granulation tower through a fully enclosed pipeline (the tuning fork sensing system is used to determine whether the slurry discharge is completed once). 12) According to the amount of feed, set the amount of adhesive added on the digital console according to the proportion (the proportion of adhesive added: 0.22L / kg), and automatically add it to the storage tank through the pipeline. 13) Then set the stirring time on the digital console (stirring time: 13h), and after the stirring is completed, it will automatically switch to the spray granulation mode. 14) Before spray granulation, set various parameters: inlet air temperature 275℃, exhaust air temperature 130℃, negative pressure in the tower -0.02KPa, atomizing disk speed 9500 rpm, feeding speed 46%-48%.

[0041] When there is slurry in the slurry tank, the mass and viscosity of the slurry will change the vibration frequency of the tuning fork sensing system at the bottom of the slurry tank. When the system senses that the change in vibration frequency reaches the set threshold, the switch outputs an electrical signal, triggering the tuning fork sensing system to open the valve. When the slurry in the slurry tank is delivered, the tuning fork sensing system at the bottom of the slurry tank will come into contact with the air, and its vibration frequency will also change accordingly. When the system senses that the change in vibration frequency reaches the set threshold, the switch outputs an electrical signal, triggering the tuning fork sensing system to close the valve.

[0042] A push-plate tunnel furnace is used for pre-firing of porcelain powder. The pushing speed in the tunnel furnace is set to 13-14 minutes / plate. One side of the tunnel furnace is the waiting area. When the tunnel furnace completes this action of 13-14 minutes / plate, the automation system will push the plate of porcelain out of the furnace to the waiting area. After this action is completed, the automatic system will give a unloading signal to the unloading robot, with an interval of 13-14 minutes (the actual unloading time takes 9-10 minutes to complete the unloading action).

[0043] Adjust the traditional 11 processes to 7 processes, shorten the processing cycle, and through the implementation of automation, the labor cost of the entire process of porcelain preparation will be reduced by more than half, and the labor efficiency can be increased by more than 1 times on the basis of the traditional process, the manufacturing process will be shortened by about 50%, the output rate will be increased by about 10%, and the pollution emissions will be reduced by 90%. The pollution of environmental impurities to porcelain during the production process can be avoided to the greatest extent, and the quality of porcelain can be further improved.

[0044] The fully automated processing technology path is adopted, and each process is connected by an automated fully enclosed pipeline, which greatly improves the input-output ratio of porcelain materials from 75% of the traditional process to 85%. At the same time, automated iron removal, automated flushing and powder fully enclosed pipeline turnover are realized, effectively reducing the introduction of impurities in the process and improving product quality consistency.

[0045] The looseness of the porcelain material is 1.2-1.3 g / cm3, the flow time is 48-50 s, the D50 is 80-85 μm, and the microscopic particle morphology of the porcelain material is full spherical.

[0046] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A PTC ceramic material automated production process, characterized in that: The steps include: S1, weighing: weighing materials and feeding; S2, primary mixing: setting the mixing time and ball milling time of the primary material, mixing and ball milling to obtain slurry; S3, spray drying: the slurry is transported to the storage tank of the spray drying tower through a fully enclosed pipeline, and then spray dried after slurry adjustment; S4, powder burning: the spray-dried porcelain material is transported to the powder burning furnace through a fully enclosed pipeline. After the powder burning is completed, the pre-burned porcelain material is moved to the storage bin; S5, secondary ball milling: The porcelain material in the storage bin is transported to the secondary material ball mill slurry tank through a fully enclosed pipeline, and the secondary ball milling is carried out after the secondary ball milling time is set; S6, slurry adjustment: after the secondary ball milling is completed, the slurry is transported to the storage tank of the spray granulation tower through a fully enclosed pipeline for slurry adjustment; S7, spray granulation: after the equipment is preheated, relevant parameters are set and then spray granulation is carried out, the parameters include inlet air temperature, exhaust air temperature, negative pressure in the tower, feed speed, and atomizer frequency.

2. The automated production process for PTC ceramics according to claim 1, characterized in that: In step S1, the mixing time of the primary material is 3h-5h, and the ball milling time is 9h-15h. After the mixing is completed, the mode is automatically switched to the ball milling mode to perform the primary ball milling of the slurry.

3. The automated production process for PTC ceramics according to claim 1, characterized in that: In step S3, the slurry is adjusted specifically by adding an adhesive at a ratio of 0.18L / kg-0.25L / kg according to the feed amount. The adhesive is automatically added to the storage tank of the spray drying tower through a pipeline, and then stirred for 6h-10h. After the stirring is completed, it is automatically switched to the spray drying mode for spray drying.

4. The automated production process for PTC ceramics according to claim 1 or 3, characterized in that: Before spray drying, set various parameters: inlet air temperature 245℃-290℃, exhaust air temperature 110℃-150℃, negative pressure in the tower -0.04KPa-0KPa, atomizing disk speed 7000-10000 rpm, and feeding speed 40%-55%.

5. The automated production process for PTC ceramics according to claim 1, characterized in that: In step S5, the mixing time of the secondary material is 2h-4h, and the ball milling time is 6h-10h. After the mixing is completed, the mode is automatically switched to the ball milling mode to perform secondary ball milling of the slurry.

6. The automated production process for PTC ceramics according to claim 1, characterized in that: In step S6, the slurry is adjusted specifically by adding auxiliary materials according to the feed amount at a ratio of 0.18L / kg-0.25L / kg, and the adhesive is automatically added to the storage tank of the spray granulation tower through a pipeline, and then stirred for 8h-10h. The auxiliary materials include adhesives, dispersants, defoamers and plasticizers.

7. The automated production process for PTC ceramics according to claim 1, characterized in that: In step S7, before spray granulation, various parameters are set: inlet air temperature 260°C-280°C, exhaust air temperature 120°C-140°C, negative pressure in the tower -0.03KPa-0KPa, atomizing disk speed 9000-11000 rpm, and feeding speed 45%-55%.

8. The automated production process for PTC ceramics according to claim 1, characterized in that: The tuning fork sensing system is used to determine whether the slurry discharge through the fully enclosed pipeline is completed each time.

9. The automated production process for PTC ceramics according to claim 1, characterized in that: In step S4, porcelain material is added to the sagger during powder firing, and the amount of porcelain material added accounts for 90% of the volume of the sagger.

10. The automated production process for PTC ceramics according to claim 9, characterized in that: After the porcelain powder is pre-fired, the material is unloaded every 12-15 minutes.

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