Multi-stage screening device for electronic-grade dicyandiamide

Abstract

The utility model discloses a multi-stage screening device for electronic-grade dicyandiamide, and relates to the technical field of chemical equipment, the device comprises a stirring type stock bin, a gas emptying mechanism, an outer circulation jacket cooling mechanism, a material conveying pipeline, a material control valve, a multi-stage vibrating screen structure, a control mechanism and a frequency converter; an inverted blade type stirrer is arranged at the bottom in the stirring type stock bin, and the outer circulation jacket cooling mechanism is mounted on the outer wall of the stirring type stock bin and is tightly attached to the outer wall of the stirring type stock bin; the multi-stage vibrating screen structure comprises a supporting frame, at least three vibrating screens and at least three telescopic controllers, the telescopic controllers and the vibrating screens are arranged in a one-to-one correspondence mode, the three vibrating screens comprise the first-stage vibrating screen, the second-stage vibrating screen and the third-stage vibrating screen, and each telescopic controller comprises a linear guide rail assembly, a sliding block and a first driving mechanism. Through the arrangement, efficient and stable multi-stage screening of dicyandiamide can be achieved, the overall structure is simple, maintenance is easy, and the multi-stage screening device is suitable for large-scale production of electronic-grade dicyandiamide.

Description

Technical Field

[0001] This application relates to the field of chemical equipment technology, and in particular to a multi-stage screening device for electronic-grade dicyandiamide. Background Technology

[0002] Electronic-grade dicyandiamide is a high-purity chemical widely used in electronics, pharmaceuticals, and chemicals. Screening is a crucial step in dicyandiamide production, primarily used for cooling, sieving, and grading to ensure product purity, particle uniformity, and quality stability. However, current electronic-grade dicyandiamide particle screening devices mainly employ primary vibrating screening, followed by secondary manual screening according to customer requirements. This process is complex, labor-intensive, and prone to product contamination and foreign object introduction. Furthermore, traditional screening devices struggle to achieve multi-stage precise screening, and material agglomeration during screening can lead to screen blockage, impacting product quality and production efficiency. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a multi-stage screening device for electronic-grade dicyandiamide, which can achieve efficient and stable multi-stage screening of dicyandiamide. The device has a simple overall structure, is easy to maintain, and is suitable for large-scale production of electronic-grade dicyandiamide.

[0004] This application provides a multi-stage screening device for electronic-grade dicyandiamide, including: a stirring silo, a gas venting mechanism, an external circulation jacket cooling mechanism, a material conveying pipeline, a material control valve, a multi-stage vibrating screen structure, a control mechanism, and a frequency converter;

[0005] The bottom of the mixing silo is equipped with a reverse-blade agitator, and the external circulation jacket cooling mechanism is installed on the outer wall of the mixing silo and fits tightly against the outer wall of the mixing silo. The top of the mixing silo is provided with a gas vent, and the gas venting mechanism is located on the top of the mixing silo and communicates with the interior of the mixing silo through the gas vent. The input end of the material conveying pipeline is connected to the output end at the bottom of the mixing silo, and the material control valve is located on the material conveying pipeline and is located close to the mixing silo.

[0006] The multi-stage vibrating screen structure includes a support frame, at least three vibrating screens, and at least three telescopic controllers. Each telescopic controller corresponds to one of the vibrating screens. The three vibrating screens are a primary vibrating screen, a secondary vibrating screen, and a tertiary vibrating screen. Each telescopic controller includes a linear guide rail assembly, a slider, and a first drive mechanism. The linear guide rail assemblies corresponding to the primary, secondary, and tertiary vibrating screens are sequentially fixed to the support frame from top to bottom. The slider is slidably mounted on its corresponding linear guide rail assembly. The first drive mechanism is connected to its corresponding slider. The primary, secondary, and tertiary vibrating screens are respectively mounted on their corresponding sliders. The primary vibrating screen has multiple first screen holes on its screen, the secondary vibrating screen has multiple second screen holes on its screen, and the tertiary vibrating screen has multiple third screen holes on its screen. The diameter of the first screen holes is larger than the diameter of the second screen holes, and the diameter of the second screen holes is larger than the diameter of the third screen holes. The output end of the material conveying pipeline is connected to the input end of the primary vibrating screen.

[0007] The control mechanism is connected to the gas venting mechanism, the external circulation jacket cooling mechanism, the material control valve and the frequency converter respectively. The control mechanism is also connected to each of the drive mechanisms. The frequency converter is connected to the inverted blade agitator, the primary vibrating screen, the secondary vibrating screen and the tertiary vibrating screen respectively.

[0008] According to some embodiments of this application, the inverted blade agitator includes an agitator shaft, a second drive mechanism, an agitator shaft base, a coupling, and multiple agitator blades. The agitator shaft base is disposed at the bottom of the agitator hopper. The agitator shaft is rotatably disposed on the agitator base. The second drive mechanism is connected to the top of the agitator shaft through the coupling. The multiple agitator blades are evenly distributed on the agitator shaft in an inverted position. The second drive mechanism is connected to the frequency converter.

[0009] According to some embodiments of this application, the gas venting mechanism includes a venting pipe, a venting valve, and a pressure sensor. The venting pipe is located at the top of the agitated silo and communicates with the interior of the agitated silo through the gas venting port. The venting valve is located on the venting pipe and is positioned close to the gas venting port. The pressure sensor is installed on the top or side of the inner wall of the agitated silo and is connected to the control mechanism.

[0010] According to some embodiments of this application, the gas venting mechanism further includes an exhaust filter disposed on the venting pipe.

[0011] According to some embodiments of this application, the gas venting mechanism further includes a gas acceleration venting mechanism, which is installed on the venting pipe and is a venting fan or a vacuum pump.

[0012] According to some embodiments of this application, the external circulation jacket cooling mechanism includes an external circulation jacket, a cooling medium input pipeline, a cooling medium output pipeline, and a circulation pump. The external circulation jacket is fixedly installed on the outer wall of the agitated silo and is tightly fitted to the outer wall of the agitated silo. The output end of the cooling medium input pipeline is connected to the input end of the external circulation jacket, and the input end of the cooling medium output pipeline is connected to the output end of the external circulation jacket. The circulation pump is located on the cooling medium input pipeline and is connected to the control mechanism.

[0013] According to some embodiments of this application, the external circulation jacket cooling mechanism further includes a first flow control valve and a second flow control valve. The first flow control valve is located on the cooling medium input pipeline, and the second flow control valve is located on the cooling medium output pipeline. Both the first flow control valve and the second flow control valve are connected to the control mechanism.

[0014] According to some embodiments of this application, the external circulation jacket cooling mechanism further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is disposed in the middle of the external circulation jacket, and the second temperature sensor is installed on the inner wall of the stirring hopper. Both the first temperature sensor and the second temperature sensor are connected to the control mechanism.

[0015] In this application, the stirred silo is used for storing and initially processing electronic-grade dicyandiamide. A reverse-blade agitator is installed at the bottom of the stirred silo to agitate the material, preventing clumping or sedimentation and ensuring uniform material distribution. A gas venting mechanism connects to the interior of the stirred silo through a gas vent to ensure timely gas discharge, preventing material contamination or excessive pressure, and maintaining pressure balance within the stirred silo. An external circulation jacketed cooling mechanism is installed on the outer wall of the stirred silo and fits tightly against it. It uses a circulating cooling medium (such as water or coolant) to remove heat, preventing material deterioration due to excessive temperature, thus cooling the stirred silo and controlling the material temperature. A primary vibration... The first, second, and third stage vibrating screens are equipped with screens of different aperture sizes (first screen aperture > second screen aperture > third screen aperture) for progressively screening electronic-grade dicyandiamide. The control mechanism drives a slider via a first drive mechanism to adjust the position of the corresponding vibrating screen, ensuring screening efficiency. The control mechanism is connected to a gas venting mechanism, an external circulation jacket cooling mechanism, a material control valve, a frequency converter, and each drive mechanism to achieve automated control. By adjusting the working state of each component, the device is ensured to operate efficiently and stably. The control mechanism is used to adjust the working frequency of the agitator and vibrating screens via the frequency converter, controlling the stirring speed of the inverted blade agitator and the screening intensity of the first, second, and third stage vibrating screens. This design enables efficient and stable multi-stage screening of dicyandiamide. The overall structure is simple, easy to maintain, and suitable for large-scale production of electronic-grade dicyandiamide.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] Additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0018] Figure 1 A simplified structural diagram of the multi-stage screening device for electronic-grade dicyandiamide provided in this application embodiment;

[0019] Figure 2 This is a schematic diagram showing the connection relationship between the various components and the control mechanism provided in the embodiments of this application.

[0020] Figure label:

[0021] 100, stirring silo, 110, gas venting mechanism, 120, feeding funnel, 130, material control valve, 140, material conveying pipeline, 150, inverted blade agitator, 160, external circulation jacket;

[0022] Multi-stage vibrating screen structure 200, primary vibrating screen 210, secondary vibrating screen 220, tertiary vibrating screen 230. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0024] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0026] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0027] Electronic-grade dicyandiamide is a high-purity chemical widely used in electronics, pharmaceuticals, and chemicals. Screening is a crucial step in dicyandiamide production, primarily used for cooling, sieving, and grading to ensure product purity, particle uniformity, and quality stability. However, current electronic-grade dicyandiamide particle screening devices mainly employ primary vibrating screening, followed by secondary manual screening according to customer requirements. This process is complex, labor-intensive, and prone to product contamination and foreign object introduction. Furthermore, traditional screening devices struggle to achieve multi-stage precise screening, and material agglomeration during screening can lead to screen blockage, impacting product quality and production efficiency.

[0028] To address the aforementioned problems, this application proposes a multi-stage sieving device for electronic-grade dicyandiamide. The embodiments of this application will be further described below with reference to the accompanying drawings.

[0029] Reference Figures 1 to 2This application provides a multi-stage screening device for electronic-grade dicyandiamide, including a stirred silo 100, a gas venting mechanism 110, an external circulation jacket cooling mechanism, a material conveying pipeline 140, a material control valve 130, a multi-stage vibrating screen structure 200, a control mechanism, and a frequency converter. A reverse-blade agitator 150 is installed at the bottom of the stirred silo 100, and the external circulation jacket cooling mechanism is installed on the outer wall of the stirred silo 100 and tightly fitted against it. A gas vent is provided at the top of the stirred silo 100, and the gas venting mechanism 110 is equipped with… The material conveying pipeline 140 is located at the top of the mixing silo 100, and the gas venting mechanism 110 is connected to the interior of the mixing silo 100 through the gas venting port. The input end of the material conveying pipeline 140 is connected to the output end at the bottom of the mixing silo 100. The material control valve 130 is located on the material conveying pipeline 140 and is positioned close to the mixing silo 100. The multi-stage vibrating screen structure 200 includes a support frame, at least three vibrating screens, and at least three telescopic controllers. The telescopic controllers are configured one-to-one with the vibrating screens. The three vibrating screens are a primary vibrating screen 210, a secondary vibrating screen 220, and so on. The telescopic controller for the three-stage vibrating screen 230 includes linear guide rail assemblies, sliders, and a first drive mechanism. The linear guide rail assemblies corresponding to the first-stage vibrating screen 210, second-stage vibrating screen 220, and third-stage vibrating screen 230 are sequentially fixed to the support frame from top to bottom. The sliders are slidably mounted on their respective linear guide rail assemblies. The first drive mechanism is connected to the corresponding slider. The first-stage vibrating screen 210, second-stage vibrating screen 220, and third-stage vibrating screen 230 are respectively mounted on their corresponding sliders. The screen of the first-stage vibrating screen 210 has multiple first screen holes, and the screen of the second-stage vibrating screen 220 has... The third-stage vibrating screen 230 has multiple second screen holes and multiple third screen holes. The diameter of the first screen hole is larger than that of the second screen hole, and the diameter of the second screen hole is larger than that of the third screen hole. The output end of the material conveying pipeline 140 is connected to the input end of the first-stage vibrating screen 210. The control mechanism is connected to the gas venting mechanism 110, the external circulation jacket cooling mechanism, the material control valve 130, and the frequency converter. The control mechanism is also connected to each drive mechanism. The frequency converter is connected to the inverted blade agitator 150, the first-stage vibrating screen 210, the second-stage vibrating screen 220, and the third-stage vibrating screen 230.

[0030] It should be noted that the material is stored in the mixing silo 100 and the inverted blade agitator 150 prevents the material from clumping; the silo temperature is controlled by the external circulation jacket cooling mechanism to ensure material quality; the gas in the silo is discharged by the gas venting mechanism 110 to maintain pressure balance; the material is conveyed to the vibrating screen structure through the material conveying pipeline 140 and the material control valve 130; the material is screened step by step by the multi-stage vibrating screen structure 200 to separate particles of different sizes; the automated operation of the device is achieved through the control mechanism and frequency converter to improve efficiency and accuracy.

[0031] It should be noted that, based on the particle size distribution of dicyandiamide, the multi-stage vibrating screen structure 200 typically includes 3-5 layers of vibrating screens. From top to bottom, the screen apertures gradually decrease. For example, the multi-stage vibrating screen structure 200 includes four vibrating screens, with aperture diameters of 500μm, 300μm, 150μm, and 75μm respectively from top to bottom. The screen mesh of each vibrating screen is made of corrosion-resistant and wear-resistant stainless steel or polyurethane screen mesh.

[0032] In some embodiments, the multi-stage vibrating screen structure 200 includes three vibrating screens and three telescopic controllers. The three vibrating screens are a primary vibrating screen 210, a secondary vibrating screen 220, and a tertiary vibrating screen 230. The support frame is provided with three layers of mounting frames. The linear guide rail assembly includes two linear guide rails, which are located on both sides of the corresponding upper, middle, or lower mounting frame. The slider is mounted on the two linear guide rails. The primary vibrating screen 210, the secondary vibrating screen 220, and the tertiary vibrating screen 230 are respectively fixedly connected to the corresponding sliders. The first drive mechanism is an electric cylinder.

[0033] In some embodiments, the top of the stirred silo 100 is provided with a feed inlet, and the multi-stage screening device for electronic-grade dicyandiamide also includes a feed funnel 120, which is disposed on the top of the stirred silo 100, and the output end of the feed funnel 120 is connected to the interior of the stirred silo 100 through the feed inlet. Control mechanism: A PLC control system is adopted, which supports remote monitoring and data recording.

[0034] In this application, the stirred silo 100 is used for storing and pre-processing electronic-grade dicyandiamide material. A reverse-blade agitator 150 is installed at the bottom of the stirred silo 100 to agitate the material, prevent clumping or sedimentation, and ensure uniform material distribution. A gas venting mechanism 110 communicates with the interior of the stirred silo 100 through a gas vent to ensure timely gas discharge, preventing material contamination or excessive pressure, and maintaining pressure balance within the stirred silo 100. An external circulation jacket cooling mechanism is installed on the outer wall of the stirred silo 100 and fits tightly against it. It removes heat through a circulating cooling medium (such as water or coolant) to prevent material deterioration due to excessive temperature, thereby cooling the stirred silo 100 and controlling the material temperature. A primary vibration... Screen 210, secondary vibrating screen 220, and tertiary vibrating screen 230 are each equipped with screens of different aperture sizes (first screen aperture > second screen aperture > third screen aperture) for progressively screening electronic-grade dicyandiamide. The control mechanism drives a slider to move via a first drive mechanism, thereby adjusting the position of the corresponding vibrating screen to ensure screening efficiency. The control mechanism is connected to a gas venting mechanism 110, an external circulation jacket cooling mechanism, a material control valve 130, a frequency converter, and each drive mechanism to achieve automated control. By adjusting the working state of each component, the device is ensured to operate efficiently and stably. The control mechanism is used to adjust the working frequency of the agitator and vibrating screens via the frequency converter to control the stirring speed of the inverted blade agitator 150 and the screening intensity of the primary vibrating screen 210, secondary vibrating screen 220, and tertiary vibrating screen 230. This application, through this configuration, enables efficient and stable multi-stage screening of dicyandiamide. The overall structure is simple, easy to maintain, and suitable for large-scale production of electronic-grade dicyandiamide.

[0035] It is understood that the inverted blade agitator 150 includes an agitator shaft, a second drive mechanism, an agitator shaft base, a coupling, and multiple agitator blades. The agitator shaft base is located at the bottom of the agitator hopper 100. The agitator shaft is rotatably mounted on the agitator base. The second drive mechanism is connected to the top of the agitator shaft via the coupling. Multiple agitator blades are evenly distributed on the agitator shaft in an inverted manner. The second drive mechanism is connected to a frequency converter.

[0036] In some embodiments, the number of stirring blades is between 3 and 6, evenly distributed on the stirring shaft, the stirring blades are inverted, the tilt angle is between 30° and 45°, and the second driving mechanism is a drive motor.

[0037] It should be noted that the stirring shaft and multiple inverted stirring blades achieve uniform stirring of the materials, ensuring thorough mixing. The second drive mechanism is connected to the stirring shaft via a coupling, providing power to rotate the stirring shaft. The frequency converter is used to adjust the speed of the second drive mechanism, thereby controlling the stirring speed and force. The stirring shaft base is fixed to the bottom of the hopper to ensure the stability of the stirring shaft during operation and prevent vibration or displacement. The inverted stirring blades can more effectively lift and turn the materials, enhancing the stirring effect and preventing material agglomeration or sedimentation.

[0038] It is understood that the gas venting mechanism 110 includes a venting pipe, a venting valve, and a pressure sensor. The venting pipe is located at the top of the mixing silo 100 and is connected to the interior of the mixing silo 100 through a gas venting port. The venting valve is located on the venting pipe and is positioned close to the gas venting port. The pressure sensor is installed on the top or side of the inner wall of the mixing silo 100 and is connected to the control mechanism.

[0039] It should be noted that the pressure sensor is installed on the top or side of the inner wall of the silo to monitor the air pressure changes in the silo in real time and feed the data back to the control mechanism. The control mechanism can adjust the opening and closing state of the vent valve according to the air pressure data to achieve automatic control. Through the vent pipe and vent valve, the gas in the mixing silo 100 is discharged to ensure the air pressure balance in the silo and avoid the mixing process or equipment safety due to excessively high or low air pressure, thus ensuring the stability of the mixing process and the quality of the material.

[0040] Understandably, the gas venting mechanism 110 also includes an exhaust filter, which is located on the venting pipe.

[0041] It should be noted that exhaust filters are used to filter dust or particulate matter from gases.

[0042] It is understood that the gas venting mechanism 110 also includes a gas acceleration venting mechanism, which is installed on the venting pipe and is a venting fan or a vacuum pump.

[0043] It should be noted that by using an exhaust fan or vacuum pump, the gas discharge rate inside the silo can be actively accelerated, significantly improving gas discharge efficiency, especially when it is necessary to quickly reduce the gas pressure inside the silo. When the gas pressure is high or rapid venting is required, the gas acceleration discharge mechanism can quickly reduce the gas pressure inside the silo, ensuring that the gas pressure is always within a safe range and avoiding damage to equipment or materials.

[0044] Reference Figure 1It is understood that the external circulation jacket cooling mechanism includes an external circulation jacket 160, a cooling medium input pipeline, a cooling medium output pipeline, and a circulation pump. The external circulation jacket 160 is fixedly installed on the outer wall of the agitated silo 100 and fits tightly against the outer wall of the agitated silo 100. The output end of the cooling medium input pipeline is connected to the input end of the external circulation jacket 160, and the input end of the cooling medium output pipeline is connected to the output end of the external circulation jacket 160. The circulation pump is located on the cooling medium input pipeline and is connected to the control mechanism.

[0045] It should be noted that the external circulation jacket 160 and the circulating flow of the cooling medium (such as water or coolant) cool the agitated silo 100 to prevent the material inside the agitated silo 100 from deteriorating or undergoing adverse reactions due to excessive temperature. The cooling medium inlet and outlet pipelines cooperate with the circulating pump to form a circulation loop for the cooling medium. The control mechanism can adjust the operating status of the circulating pump according to the temperature inside the agitated silo 100 to achieve precise temperature control. The external circulation jacket 160 is tightly fitted to the outer wall of the agitated silo 100 to ensure uniform distribution of the cooling medium, avoid local overheating or uneven cooling, and improve the cooling effect. The cooling medium flows within the outer circulation jacket 160, making full contact with the outer wall of the agitated silo 100 to achieve efficient heat exchange, quickly remove heat, and maintain a suitable temperature within the agitated silo 100. The circulation pump is connected to the control mechanism and can automatically start / stop or adjust the flow rate of the cooling medium based on data feedback from the temperature sensor, reducing manual intervention and improving the automation level of the equipment. The outer circulation jacket 160 is fixed to the outer wall of the agitated silo 100, requiring no additional space, and has a compact structure that facilitates installation and maintenance.

[0046] Reference Figure 2 It is understandable that the external circulation jacket cooling mechanism also includes a first flow control valve and a second flow control valve. The first flow control valve is located on the cooling medium input pipeline, and the second flow control valve is located on the cooling medium output pipeline. Both the first flow control valve and the second flow control valve are connected to the control mechanism.

[0047] It should be noted that the first and second flow control valves regulate the input and output flow rates of the cooling medium, respectively, achieving precise control of the cooling medium circulation and ensuring stable cooling performance. Based on temperature changes within the agitated silo 100, the control mechanism dynamically adjusts the opening of the flow control valves to optimize the flow rate and velocity of the cooling medium, improving cooling efficiency and preventing energy waste. The first and second flow control valves work together to balance the input and output pressures of the cooling medium, preventing damage to the external circulation jacket 160 or pipelines due to uneven pressure. Connected to the control mechanism, the flow control valves automatically adjust the cooling medium flow rate based on data from temperature sensors, achieving fully automated operation and reducing manual intervention. In scenarios requiring rapid cooling or maintenance of specific temperatures, the flow control valves respond quickly, adjusting the cooling medium flow rate to meet different process requirements. When abnormalities occur in the cooling system (such as pipeline blockage or excessive pressure), the flow control valves can promptly close or limit the flow rate to prevent equipment damage and improve system safety. Precise control of the cooling medium flow rate avoids excessive use of the cooling medium, reducing energy consumption and operating costs while minimizing environmental impact.

[0048] Reference Figure 2 It is understood that the external circulation jacket cooling mechanism also includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located in the middle of the external circulation jacket 160, and the second temperature sensor is installed on the inner wall of the stirring hopper 100. Both the first temperature sensor and the second temperature sensor are connected to the control mechanism.

[0049] It should be noted that the first temperature sensor is located in the middle of the outer circulation jacket 160, monitoring the temperature of the cooling medium in real time to ensure that the temperature of the cooling medium is within a reasonable range; the second temperature sensor is installed on the inner wall of the stirring silo 100, monitoring the temperature of the material in the silo in real time to ensure that the material temperature meets the process requirements. Through data feedback from the first and second temperature sensors, the control mechanism can dynamically adjust the flow rate of the cooling medium (via a flow control valve) and the operating status of the circulation pump to achieve precise temperature control within the silo. Specifically, based on the data from the first temperature sensor, the control mechanism can determine the cooling efficiency of the cooling medium, avoiding excessively high or low temperatures that could affect the cooling effect; based on the data from the second temperature sensor, the control mechanism can adjust the cooling intensity in real time to ensure that the material temperature is always within the optimal process range; when the first temperature sensor detects an abnormal cooling medium temperature (such as too high or too low), or the second temperature sensor detects an abnormal temperature within the silo, the control mechanism can promptly issue an alarm or take protective measures (such as shutting down the circulation pump or adjusting the flow control valve) to prevent damage to the equipment or materials.

[0050] It should be noted that the temperature sensor and control mechanism work together to automate the cooling process, reducing manual intervention and improving equipment efficiency and reliability. Precise temperature monitoring and control prevent over-cooling or under-cooling, reducing energy consumption and operating costs while minimizing environmental impact.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

[0053] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A multi-stage screening apparatus for electronic grade dicyandiamide, characterized by, include: Mixing silo, gas venting mechanism, external circulation jacket cooling mechanism, material conveying pipeline, material control valve, multi-stage vibrating screen structure, control mechanism and frequency converter; The bottom of the mixing silo is equipped with a reverse-blade agitator, and the external circulation jacket cooling mechanism is installed on the outer wall of the mixing silo and fits tightly against the outer wall of the mixing silo. The top of the mixing silo is provided with a gas vent, and the gas venting mechanism is located on the top of the mixing silo and communicates with the interior of the mixing silo through the gas vent. The input end of the material conveying pipeline is connected to the output end at the bottom of the mixing silo, and the material control valve is located on the material conveying pipeline and is located close to the mixing silo. The multi-stage vibrating screen structure includes a support frame, at least three vibrating screens, and at least three telescopic controllers. Each telescopic controller corresponds to one of the vibrating screens. The three vibrating screens are a primary vibrating screen, a secondary vibrating screen, and a tertiary vibrating screen. Each telescopic controller includes a linear guide rail assembly, a slider, and a first drive mechanism. The linear guide rail assemblies corresponding to the primary, secondary, and tertiary vibrating screens are sequentially fixed to the support frame from top to bottom. The slider is slidably mounted on its corresponding linear guide rail assembly. The first drive mechanism is connected to its corresponding slider. The primary, secondary, and tertiary vibrating screens are respectively mounted on their corresponding sliders. The primary vibrating screen has multiple first screen holes on its screen, the secondary vibrating screen has multiple second screen holes on its screen, and the tertiary vibrating screen has multiple third screen holes on its screen. The diameter of the first screen holes is larger than the diameter of the second screen holes, and the diameter of the second screen holes is larger than the diameter of the third screen holes. The output end of the material conveying pipeline is connected to the input end of the primary vibrating screen. The control mechanism is connected to the gas venting mechanism, the external circulation jacket cooling mechanism, the material control valve and the frequency converter respectively. The control mechanism is also connected to each of the drive mechanisms. The frequency converter is connected to the inverted blade agitator, the primary vibrating screen, the secondary vibrating screen and the tertiary vibrating screen respectively.

2. The multi-stage screening apparatus for electronic grade dicyandiamide according to claim 1, characterized by, The inverted blade agitator includes an agitator shaft, a second drive mechanism, an agitator shaft base, a coupling, and multiple agitator blades. The agitator shaft base is located at the bottom of the agitator hopper. The agitator shaft is rotatably mounted on the agitator base. The second drive mechanism is connected to the top of the agitator shaft via the coupling. The multiple agitator blades are evenly distributed on the agitator shaft in an inverted position. The second drive mechanism is connected to the frequency converter.

3. The multi-stage screening apparatus for electronic grade dicyandiamide according to claim 1, wherein The gas venting mechanism includes a venting pipe, a venting valve, and a pressure sensor. The venting pipe is located at the top of the agitated silo and is connected to the interior of the agitated silo through the gas venting port. The venting valve is located on the venting pipe and is positioned close to the gas venting port. The pressure sensor is installed on the top or side of the inner wall of the agitated silo and is connected to the control mechanism.

4. The multi-stage screening apparatus for electronic grade dicyandiamide according to claim 3, characterized by, The gas venting mechanism also includes an exhaust filter, which is disposed on the venting pipe.

5. The multi-stage screening apparatus for electronic grade dicyandiamide according to claim 3, wherein The gas venting mechanism also includes a gas acceleration venting mechanism, which is installed on the venting pipe and is a venting fan or a vacuum pump.

6. The multi-stage screening apparatus for electronic grade dicyandiamide according to claim 1, wherein The external circulation jacket cooling mechanism includes an external circulation jacket, a cooling medium input pipeline, a cooling medium output pipeline, and a circulation pump. The external circulation jacket is fixedly installed on the outer wall of the agitated silo and fits tightly against the outer wall of the agitated silo. The output end of the cooling medium input pipeline is connected to the input end of the external circulation jacket, and the input end of the cooling medium output pipeline is connected to the output end of the external circulation jacket. The circulation pump is located on the cooling medium input pipeline and is connected to the control mechanism.

7. The multi-stage screening apparatus for electronic grade dicyandiamide according to claim 6, wherein The external circulation jacket cooling mechanism further includes a first flow control valve and a second flow control valve. The first flow control valve is located on the cooling medium input pipeline, and the second flow control valve is located on the cooling medium output pipeline. Both the first flow control valve and the second flow control valve are connected to the control mechanism.

8. The multi-stage screening device for electronic-grade dicyandiamide according to claim 6, characterized in that, The external circulation jacket cooling mechanism further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located in the middle of the external circulation jacket, and the second temperature sensor is installed on the inner wall of the stirring hopper. Both the first temperature sensor and the second temperature sensor are connected to the control mechanism.

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