Filter cake drying equipment for preparing benzophenone oxime

Abstract

The invention relates to the technical field of chemical equipment, in particular to filter cake drying equipment for preparing benzophenone oxime, which comprises a vacuum stirring tank, a filter cake crushing assembly, a suction mixing and stirring assembly, a vacuum control system and a low-temperature drying tank fixed at the bottom end of the vacuum stirring tank, the suction mixing and stirring assembly is fixedly arranged at the bottom end of the low-temperature drying tank, and the vacuum control system is arranged at the bottom end of the low-temperature drying tank. A guide hopper is fixedly mounted on the inner side of the vacuum stirring tank, and the filter cake crushing assembly is located under the guide hopper and used for crushing filter cakes. The suction mixing and stirring assembly and the vacuum control system are combined for use, and the vacuum pump and the vacuum degree control system are utilized, so that efficient vacuum drying can be realized in the vacuum stirring tank and the low-temperature drying tank, and a solvent is effectively removed from the benzophenone oxime filter cake in the drying process; and meanwhile, the problem of product degradation caused by long-time heating in a traditional drying method is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment, in particular to filter cake drying equipment for preparing benzophenone oxime. Background Art

[0002] In the preparation process of benzophenone oxime, filter cake drying is a key step. Traditional filter cake drying equipment usually adopts heating drying or atmospheric pressure drying methods to remove the solvent from the material by heating the material for a long time. This drying equipment mainly includes a heater, a filter screen, a stirring paddle and an exhaust system. The heater provides heat to the material to evaporate its moisture or solvent, and then the gas is taken away by the exhaust system. The stirring paddle is used to evenly distribute the material during the heating process to avoid local overheating. However, this traditional drying method has many problems in practical applications.

[0003] Disadvantages of traditional technical solutions: Low drying efficiency and high energy consumption: Traditional heating drying equipment uses a long-term heating method, and the material needs to be processed at a higher temperature, which not only consumes a lot of energy, but also prolongs the entire drying process. In addition, for highly viscous or easily agglomerated materials, the drying effect of traditional equipment is often not ideal, the drying is uneven, and the temperature difference between the inside and outside of the material is large, resulting in incomplete drying.

[0004] It is easy to cause material degradation: Under high temperature conditions, sensitive chemicals such as benzophenone oxime are prone to thermal degradation, affecting the purity and quality of the product. Since traditional equipment lacks effective vacuum control and temperature regulation, it cannot be dried efficiently in a low temperature environment, which can easily lead to a decrease in product quality. In addition, long-term heating will also increase heat energy consumption.

[0005] Vacuum control is unstable and drying effect is difficult to guarantee: Although traditional drying equipment is sometimes equipped with a simple vacuum pump, it is unable to accurately control the vacuum degree, and is prone to problems of insufficient or excessive vacuum, resulting in poor drying effect. Due to the lack of an intelligent control system, the vacuum degree cannot be flexibly adjusted according to different materials and process requirements, and the versatility and adaptability of the equipment are poor.

[0006] In view of this, research and improvement are carried out on the existing problems, and a filter cake drying equipment for the preparation of benzophenone oxime is provided to solve the current problems. The purpose is to solve the problems and improve the practical value through this technology. Summary of the invention

[0007] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0008] To this end, the technical solution adopted by the present invention is: a filter cake drying device for preparing benzophenone oxime, comprising: a vacuum stirring tank, a filter cake crushing component, a suction and mixing component and a vacuum control system, and a low-temperature drying tank fixed at the bottom of the vacuum stirring tank. The suction and mixing component is fixedly installed at the bottom of the low-temperature drying tank, a guide hopper is fixedly installed on the inner side of the vacuum stirring tank, and the filter cake crushing component is located directly below the guide hopper for filter cake crushing processing. The suction and mixing assembly includes a driving seat, a filter disc, a stirring shaft rod and a breaking stirring wheel. The driving seat is fixedly installed on the bottom surface of the low-temperature drying tank, and a fixed ring gear is fixedly installed on the bottom surface of the low-temperature drying tank. The filter disc is rotatably sleeved on the inner side of the universal pipe seat and the top surface is connected with the inner side of the low-temperature drying tank. The surface of the filter disc is rotatably installed with a stirring shaft rod deviating from the center of the filter disc, and the breaking stirring wheel is fixedly installed on the surface of the stirring shaft rod. The bottom end of the filter disc is rotatably connected with a universal pipe seat, and the surface of the universal pipe seat is provided with a suction pipe for connecting to a vacuum pipeline, the bottom surface of the filter disc is fixedly installed with worm gear teeth, and the surface of the driving seat is fixedly installed with a driving motor for driving the worm gear teeth and the filter disc to rotate. The vacuum control system includes: a vacuum pump, which is used to evacuate the inside of the vacuum stirring tank and the low-temperature drying tank to maintain a preset vacuum degree; a vacuum degree sensor, which is arranged in the low-temperature drying tank and is used to monitor the vacuum degree in the low-temperature drying tank in real time; a controller, which is connected to the vacuum pump and the vacuum degree sensor and is used to adjust the operation of the vacuum pump according to the signal of the vacuum degree sensor to maintain the vacuum degree in the low-temperature drying tank within a preset range; a safety protection device, which is used to automatically start pressure relief when the vacuum degree exceeds a safety threshold to ensure safe operation of the equipment.

[0009] By adopting the above technical solution, the equipment can efficiently dry the filter cake and achieve a stable vacuum environment through a vacuum pump and a vacuum control system, thereby effectively removing the solvent in the filter cake while maintaining product quality.

[0010] In a possible implementation, the air inlet of the vacuum pump is connected to the surface of the suction pipe, and a vacuum regulating valve is installed inside the universal union seat, and its opening is controlled by a controller to accurately adjust the vacuum degree. This technical solution can effectively control the vacuum degree by setting the opening of the vacuum regulating valve, ensure the consistency of the drying effect, avoid the problem of excessive or insufficient vacuum, and thus improve the working stability of the drying equipment.

[0011] In a possible implementation, the controller is a programmable logic controller (PLC) with a human-machine interface for setting and displaying vacuum parameters. The vacuum sensor is a capacitive vacuum sensor with high precision and high sensitivity. The vacuum pump is a variable frequency controlled rotary vane vacuum pump, which achieves precise control of the vacuum by adjusting the motor speed. The vacuum regulating valve is a proportional control valve that can be continuously adjusted according to the instructions of the controller. The safety protection device includes a vacuum pressure relief valve and an over-limit alarm system. When the vacuum exceeds the preset threshold, the pressure is automatically relieved and an alarm is sounded. The controller is also connected to a data recording module for recording parameters such as vacuum, temperature and time, which is convenient for process monitoring and quality tracing. The vacuum control system is provided with a remote monitoring and control function, which can communicate with the host computer through a network interface to achieve remote real-time monitoring and parameter adjustment of the vacuum drying process. Through such a design, the equipment can flexibly adapt to different material and process requirements, achieve precise vacuum control, and improve operation convenience and production efficiency through remote monitoring and adjustment.

[0012] In a possible implementation, the guide hopper is used to guide the material to the area of ​​action of the reduction motor, and an anti-blocking paddle is movably installed on the inner side of the vacuum stirring tank, and one end of the anti-blocking paddle extends to the outer side of the vacuum stirring tank. Through the design of the guide hopper and the anti-blocking paddle, it is possible to ensure that the material is evenly distributed during the drying process and effectively guided to the area of ​​action of the reduction motor, thereby improving the effect of filter cake crushing and drying.

[0013] In a possible embodiment, the filter cake crushing assembly includes a first roller and a second roller rotatably mounted on the inner side of the vacuum stirring tank, and a reduction motor fixedly mounted on the surface of the vacuum stirring tank for driving the first roller and the second roller to rotate, and the surfaces of the first roller and the second roller are both provided with a plurality of reduction motors, and the vacuum control system is fixedly mounted on the surface of the vacuum stirring tank. This structure ensures that the filter cake is evenly processed during the crushing process through the design of the first roller and the second roller, improves the crushing efficiency, and makes the subsequent drying more sufficient.

[0014] In a possible implementation, the top surface of the vacuum stirring tank and the surface of the low-temperature drying tank are respectively provided with a sealing cover and a discharge cover, and the surface of the vacuum stirring tank is provided with a sealing sleeve sleeved on the anti-blocking paddle rod, the first roller and the second roller. This design provides a better sealing effect, avoids solvent leakage and gas escape during the drying process, and ensures the safety of the working environment and the stability of the equipment.

[0015] In a possible implementation, the filter disc is disc-shaped and has a plurality of filter holes on its surface for extracting the solvent. The filter holes have a diameter of 10-50 microns and are used to isolate the material to extract the gas and solvent. The universal joint is fixedly installed on the inner side of the drive seat, and the top end is connected to the inner cavity of the filter disc. The design of the filter disc and the filter holes ensures that the solvent and gas can be efficiently discharged during the vacuum drying process, and the material can be effectively isolated, thereby improving the drying efficiency.

[0016] In a possible implementation, the bottom end of the stirring shaft is provided with a planetary gear for driving the stirring wheel to rotate, and the planetary gear deviates from the central axis of the filter plate and is in driving engagement with the inner side of the fixed ring gear. The design of the planetary gear and the stirring wheel ensures the stability of the stirring function, so that the material in the drying process can be heated evenly, avoiding agglomeration, and improving the drying consistency of the product.

[0017] The beneficial effects achieved by the present invention are: 1. In the present invention, by combining the suction mixing component and the vacuum control system, using a vacuum pump and a vacuum control system, efficient vacuum drying can be achieved in a vacuum stirring tank and a low-temperature drying tank, ensuring that the solvent is effectively removed from the benzophenone oxime filter cake during the drying process, while avoiding the problem of product degradation caused by long-term heating in traditional drying methods.

[0018] 2. In the present invention, the structure design of the filter plate and the suction pipe enables vacuum filtration and drying to be carried out simultaneously. By controlling the operation of the vacuum pump, efficient extraction of the solvent and discharge of the gas are achieved, ensuring the uniformity of the drying effect. Further, through the stirring action of the stirring wheel, the agglomeration of the filter cake during the drying process is prevented, ensuring uniform distribution of the material and drying consistency.

[0019] 3. In the present invention, the vacuum sensor and controller in the vacuum control system ensure that the drying process is carried out in a preset vacuum environment by real-time monitoring and automatic adjustment of the vacuum degree, thereby improving the stability and controllability of production and effectively reducing energy consumption. The vacuum pump system is frequency-controlled and cooperates with a PLC controller and a proportional control valve to accurately adjust the vacuum degree according to different materials and process requirements, so that the equipment can adapt to diverse drying requirements, thereby improving the versatility and application range of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 A schematic diagram of the internal structure of a vacuum stirring tank according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a filter cake crushing assembly according to an embodiment of the present invention; Figure 4This is a schematic diagram of the structure of a low-temperature drying tank and a suction mixing component according to an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a suction and mixing component according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the decomposed structure of a suction and mixing component according to an embodiment of the present invention.

[0021] Reference numerals: 100, vacuum stirring tank; 110, low temperature drying tank; 101, sealing cover; 102, guide hopper; 103, anti-blocking paddle rod; 111, discharge cover; 200, filter cake crushing assembly; 210, first rotating roller; 220, second rotating roller; 230, reduction motor; 240, crushing teeth; 300, suction and mixing assembly; 310, driving seat; 320, suction filter plate; 330, stirring shaft rod; 340, breaking and stirring wheel; 350, worm gear; 311, driving motor; 312, fixed ring gear; 321, universal joint pipe seat; 322, suction pipe; 331, planetary gear; 400. Vacuum control system. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0023] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0024] A filter cake drying device for preparing benzophenone oxime provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0025] Combination Figure 1-Figure 6 As shown, the present invention provides a filter cake drying device for preparing benzophenone oxime.

[0026] Example 1 The present invention provides a filter cake drying device for preparing benzophenone oxime, comprising: a vacuum stirring tank 100, a filter cake crushing component 200, a suction mixing component 300 and a vacuum control system 400, and a low-temperature drying tank 110 fixed to the bottom end of the vacuum stirring tank 100, the suction mixing component 300 is fixedly installed at the bottom end of the low-temperature drying tank 110, a guide hopper 102 is fixedly installed on the inner side of the vacuum stirring tank 100, and the filter cake crushing component 200 is located directly below the guide hopper 102 for filter cake crushing processing.

[0027] The suction mixing assembly 300 includes a driving seat 310, a suction filter plate 320, a stirring shaft rod 330 and a breaking stirring wheel 340. The driving seat 310 is fixedly installed on the bottom surface of the low-temperature drying tank 110. The bottom surface of the low-temperature drying tank 110 is fixedly installed with a fixed ring gear 312. The suction filter plate 320 is rotatably sleeved on the inner side of the universal joint pipe seat 321 and the top surface is connected to the inner side of the low-temperature drying tank 110. The surface of the suction filter plate 320 is rotatably installed with a gear that deviates from the circle of the suction filter plate 320. The stirring shaft 330 is centered, and the stirring wheel 340 is fixedly mounted on the surface of the stirring shaft 330. The bottom end of the filter plate 320 is rotatably connected to a universal union seat 321. The surface of the universal union seat 321 is provided with a suction pipe 322 for connecting to a vacuum pipeline. The bottom surface of the filter plate 320 is fixedly mounted with a worm gear 350. The surface of the drive seat 310 is fixedly mounted with a drive motor 311 for driving the worm gear 350 and the filter plate 320 to rotate.

[0028] The vacuum control system 400 includes: a vacuum pump, which is used to evacuate the inside of the vacuum stirring tank 100 and the low-temperature drying tank 110 to maintain a preset vacuum degree; a vacuum degree sensor, which is arranged in the low-temperature drying tank 110 and is used to monitor the vacuum degree in the low-temperature drying tank 110 in real time; a controller, which is connected to the vacuum pump and the vacuum degree sensor and is used to adjust the operation of the vacuum pump according to the signal of the vacuum degree sensor to maintain the vacuum degree in the low-temperature drying tank 110 within a preset range; a safety protection device, which is used to automatically start pressure relief when the vacuum degree exceeds a safety threshold to ensure safe operation of the equipment.

[0029] Through the above configuration, the equipment can realize effective filter cake crushing and vacuum drying process. In specific operation, the filter cake containing solvent is first loaded into the guide hopper 102, and then the vacuum pump in the vacuum control system 400 is started to perform the vacuum operation. When the preset vacuum degree is reached, the controller maintains the stability of the environment by adjusting the valve, and at the same time, the roller in the filter cake crushing assembly 200 performs the crushing operation to break the filter cake into small particles to facilitate drying. In this process, the uniform distribution and efficient drying of the material are achieved through the rotation of the suction plate 320 and the stirring action of the crushing wheel 340, and finally the dried filter cake is discharged through the bottom end of the low-temperature drying tank 110.

[0030] Example 2 In another embodiment, the filter cake drying device of the present invention is further optimized in structural design to improve the automation and adaptability of operation. For example, the upper surface of the filter plate 320 is provided with a plurality of filter holes with an aperture of 10-50 microns, which are used to efficiently guide the solvent gas and realize the vacuum filtration function. By providing the filter holes with small apertures, the filter cake can be prevented from being blocked, and the gas and the solvent can be effectively separated, which further improves the drying effect.

[0031] A plurality of connecting brackets are also provided between the driving seat 310 and the bottom surface of the low-temperature drying tank 110, so that the suction filter plate 320 can maintain horizontal stability when rotating. At the same time, the design of the universal joint pipe seat 321 makes it more convenient to connect with the external vacuum pipeline, and can adapt to vacuum pumps of different specifications. In this embodiment, the vacuum pump adopts frequency conversion control, and the motor speed is accurately adjusted by the controller to ensure that a stable vacuum environment is maintained during the drying process.

[0032] In addition, the vacuum control system 400 vacuum control system can achieve real-time management of the equipment through a remote monitoring module. The user can set the drying program through the host computer, including setting parameters such as temperature, vacuum degree, stirring speed, etc., to achieve more precise process control. During the specific operation, after the vacuum pump is started, the suction holes set on the suction filter disc 320 begin to synchronously export the solvent, and combined with the stirring function of the stirring wheel 340, the problem of filter cake agglomeration is avoided, and the extraction speed of the solvent is increased.

[0033] After the equipment is finished working, the system will automatically stop the vacuum pump and start the pressure relief process to ensure that the air pressure inside the equipment returns to normal so that the user can easily unload the dried filter cake. In addition, the control system can also record data such as drying time, vacuum degree, temperature, etc. for quality traceability and process optimization.

[0034] Further extended applications The present invention is not only applicable to the drying of benzophenone oxime, but also can be adjusted according to actual needs to adapt to other similar filter cake drying tasks. The modular design of the equipment enables it to quickly switch between different drying modes. For example, by replacing the rollers in the filter cake crushing assembly 200, filter cakes of different hardness can be processed. At the same time, the addition of frequency conversion control and PLC modules makes the equipment operation more flexible and can be customized according to different material characteristics.

[0035] In general, the present invention provides an efficient, stable and easy-to-operate vacuum drying equipment, which ensures the drying effect and production quality of the filter cake through scientific structural design and automatic control, and provides important equipment support for the production of benzophenone oxime and other chemical products.

[0036] The working principle and use process of the present invention: The filter cake drying device for preparing benzophenone oxime of the present invention realizes efficient drying mainly through the combined functions of vacuum drying and filter cake crushing. The device uses a vacuum pump and a vacuum control system to create a stable low-pressure environment, so that the solvent can evaporate rapidly at a lower temperature, avoiding the problem of product degradation that may be caused by traditional high-temperature drying methods.

[0037] During the specific working process, the vacuum pump is first used to evacuate the inside of the equipment to reduce the internal air pressure. The vacuum sensor monitors the vacuum conditions inside the equipment in real time and feeds the data back to the controller. The controller maintains the stability of the vacuum environment by adjusting the operation of the vacuum pump and controlling the opening of the vacuum regulating valve according to the preset vacuum range. At the same time, the filter cake in the equipment is crushed by the roller in the filter cake crushing assembly 200 to prevent the filter cake from forming large lumps and ensure the uniformity of the drying process. The filter disc 320 and the stirring wheel 340 in the equipment work together to prevent the filter cake from agglomerating during the vacuum drying process and ensure the uniform distribution of the material and the drying effect.

[0038] Usage Process Preparation: Before using the equipment, check whether all parts are firmly connected, and ensure that the vacuum stirring tank 100, low-temperature drying tank 110, filter cake crushing assembly 200 and suction mixing assembly 300 are in normal condition. Confirm that the vacuum pump, vacuum sensor, controller and safety protection device are operating normally, and the electrical system is well connected. According to actual production needs, set appropriate parameters such as vacuum degree and drying time on the controller interface.

[0039] Material loading: Open the sealing cover 101, and load the benzophenone oxime filter cake containing the solvent into the guide hopper 102, ensuring that the material is evenly spread above the guide hopper 102. Close the sealing cover 101, ensuring that it is sealed in place to prevent air leakage during the drying process.

[0040] Start the equipment: Start the control system, the vacuum pump starts working, and the equipment starts vacuum extraction operation. When the vacuum degree reaches the set value, the controller automatically adjusts the operation of the vacuum pump to maintain a stable vacuum environment. At the same time, the roller in the filter cake crushing assembly 200 starts to rotate, and the filter cake is initially crushed, and the crushed material enters the low-temperature drying tank 110.

[0041] The vacuum sensor monitors the vacuum condition inside the low-temperature drying tank 110 in real time and feeds the data back to the controller.

[0042] Filter cake crushing and filtration process: During the vacuum drying process, the rollers in the filter cake crushing assembly 200 continue to work, breaking large pieces of filter cake into small particles, increasing the drying surface area and accelerating the drying efficiency. The filtration holes on the filtration disc 320 disc-shaped assembly have an aperture of 10-50 microns, allowing gas and solvent to be effectively discharged, achieving simultaneous filtration and drying.

[0043] Stirring and uniform drying: The filter disc 320 is driven by the driving motor 311 to rotate to avoid clogging of micropores on the surface of the filter disc 320; and the breaking and stirring wheel 340 in the low-temperature drying tank 110 rotates, and the planetary gears 331 are engaged with the inner side of the fixed ring gear 312 during the rotation of the filter disc 320. During the rotation of the filter disc 320, the stirring shaft 330 and the breaking and stirring wheel 340 perform planetary motion and the breaking and stirring wheel 340 performs synchronous autorotation motion to prevent the filter cake from agglomerating during the drying process, thereby ensuring uniform drying.

[0044] During this period, the vacuum control system 400 vacuum control system will automatically adjust the operation of the vacuum pump according to the real-time changes in the vacuum degree, and accurately control the vacuum degree inside the system through the vacuum regulating valve.

[0045] Drying completion and unloading: When the drying process is completed, the control system will stop the operation of the vacuum pump and restore the normal air pressure inside the equipment through the pressure relief valve.

[0046] The discharge cover 111 is opened to discharge the dried filter cake from the surface of the low-temperature drying tank 110 .

[0047] If necessary, data such as vacuum degree, temperature and drying time can be checked again through the control system for record keeping and quality traceability.

[0048] Through the above operation process, the equipment of the present invention can efficiently and evenly perform vacuum drying treatment on the benzophenone oxime filter cake, thereby improving production efficiency and ensuring product quality.

[0049] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A filter cake drying device for preparing benzophenone oxime, characterized in that: include: A vacuum stirring tank (100), a filter cake crushing assembly (200), a suction mixing assembly (300), a vacuum control system (400), and a low-temperature drying tank (110) fixed to the bottom end of the vacuum stirring tank (100), wherein the suction mixing assembly (300) is fixedly mounted on the bottom end of the low-temperature drying tank (110), a material guide hopper (102) is fixedly mounted on the inner side of the vacuum stirring tank (100), and the filter cake crushing assembly (200) is located directly below the material guide hopper (102) for filter cake crushing processing; The suction mixing assembly (300) comprises a driving seat (310), a suction filter plate (320), a stirring shaft (330) and a stirring wheel (340); the driving seat (310) is fixedly mounted on the bottom surface of a low-temperature drying tank (110); a fixed ring gear (312) is fixedly mounted on the bottom surface of the low-temperature drying tank (110); the suction filter plate (320) is rotatably sleeved on the inner side of a universal joint pipe seat (321) and the top surface is in communication with the inner side of the low-temperature drying tank (110); a surface of the suction filter plate (320) is rotatably mounted with a gear that deviates from the suction filter plate (320); The stirring shaft (330) is centered on the center of the circle, the stirring wheel (340) is fixedly mounted on the surface of the stirring shaft (330), the bottom end of the suction filter disc (320) is rotatably connected to a universal pipe socket (321), the surface of the universal pipe socket (321) is provided with a suction pipe (322) for connecting to a vacuum pipeline, the bottom surface of the suction filter disc (320) is fixedly mounted with worm gears (350), and the surface of the drive seat (310) is fixedly mounted with a drive motor (311) for driving the worm gears (350) and the suction filter disc (320) to rotate.

2. A filter cake drying device for preparing benzophenone oxime according to claim 1, characterized in that: The vacuum control system (400) comprises: a vacuum pump, used to evacuate the inside of the vacuum stirring tank (100) and the low-temperature drying tank (110) to maintain a preset vacuum degree; a vacuum degree sensor, arranged in the low-temperature drying tank (110) and used to monitor the vacuum degree in the low-temperature drying tank (110) in real time; a controller, connected to the vacuum pump and the vacuum degree sensor, used to adjust the operation of the vacuum pump according to a signal from the vacuum degree sensor to maintain the vacuum degree in the low-temperature drying tank (110) within a preset range; and a safety protection device, used to automatically start pressure relief when the vacuum degree exceeds a safety threshold, thereby ensuring safe operation of the equipment.

3. A filter cake drying device for preparing benzophenone oxime according to claim 2, characterized in that: The air inlet end of the vacuum pump is in communication with the surface of the suction pipe (322), and a vacuum regulating valve is installed inside the universal pipe seat (321), the opening of which is controlled by a controller to accurately adjust the vacuum degree.

4. A filter cake drying device for preparing benzophenone oxime according to claim 2, characterized in that: The controller is a programmable logic controller (PLC) with a human-machine interface for setting and displaying vacuum parameters. The vacuum sensor is a capacitive vacuum sensor with high precision and high sensitivity. The vacuum pump is a variable frequency controlled rotary vane vacuum pump, which achieves precise control of the vacuum by adjusting the motor speed. The vacuum regulating valve is a proportional control valve that can achieve continuous adjustment according to the instructions of the controller. The safety protection device includes a vacuum pressure relief valve and an over-limit alarm system. When the vacuum exceeds a preset threshold, the pressure is automatically relieved and an alarm is issued. The controller is also connected to a data recording module for recording parameters such as vacuum, temperature and time, which is convenient for process monitoring and quality tracing. The vacuum control system is provided with remote monitoring and control functions, and can communicate with the host computer through a network interface to achieve remote real-time monitoring and parameter adjustment of the vacuum drying process.

5. A filter cake drying device for preparing benzophenone oxime according to claim 1, characterized in that: The guide hopper (102) is used to guide the material to the action area of ​​the reduction motor (230), and an anti-blocking paddle rod (103) is movably installed inside the vacuum stirring tank (100), and one end of the anti-blocking paddle rod (103) penetrates to the outside of the vacuum stirring tank (100).

6. A filter cake drying device for preparing benzophenone oxime according to claim 1, characterized in that: The filter cake crushing assembly (200) comprises a first rotating roller (210) and a second rotating roller (220) rotatably mounted on the inner side of the vacuum stirring tank (100), and a reduction motor (230) fixedly mounted on the surface of the vacuum stirring tank (100) for driving the first rotating roller (210) and the second rotating roller (220) to rotate, wherein a plurality of reduction motors (230) are provided on the surface of the first rotating roller (210) and the second rotating roller (220), and the vacuum control system (400) is fixedly mounted on the surface of the vacuum stirring tank (100).

7. A filter cake drying device for preparing benzophenone oxime according to claim 6, characterized in that: The top surface of the vacuum stirring tank (100) and the surface of the low-temperature drying tank (110) are respectively provided with a sealing cover (101) and a discharge cover (111), and the surface of the vacuum stirring tank (100) is provided with a sealing sleeve sleeved on the surfaces of the anti-blocking paddle rod (103), the first rotating roller (210), and the second rotating roller (220).

8. A filter cake drying device for preparing benzophenone oxime according to claim 1, characterized in that: The suction filter disc (320) is disc-shaped and has a plurality of suction filter holes on its surface for extracting the solvent. The diameter of the suction filter holes is 10-50 microns and is used to isolate materials and extract gas and solvent. The universal joint seat (321) is fixedly mounted on the inner side of the drive seat (310), and the top end is in communication with the inner cavity of the suction filter disc (320).

9. A filter cake drying device for preparing benzophenone oxime according to claim 1, characterized in that: The bottom end of the stirring shaft rod (330) is provided with a planetary gear (331) for driving the stirring wheel (340) to rotate, and the planetary gear (331) deviates from the central axis of the filter plate (320) and is in driving engagement with the inner side of the fixed ring gear (312).

Images