Method and device for on-line purification and recovery of rotor seal oil

Abstract

The present application relates to the field of waste oil recovery, and provides a rotor sealing oil online purification and recovery method and device, the method comprising: obtaining waste rotor sealing oil to be treated from an internal mixer; preliminarily removing impurities and water from the waste rotor sealing oil; heating the waste rotor sealing oil by combining steam heating and electromagnetic heating, and vacuum dewatering the heated waste rotor sealing oil; after the moisture content of the waste rotor sealing oil meets the standard, filtering and removing impurities by centrifugal separation; and recycling the waste rotor sealing oil after the metal particle index meets the standard. The present application solves the problem that rotor sealing oil cannot be purified and recycled online in the related art, thereby reducing the cost. The present application builds a whole-process closed-loop circulation system of online collection, online purification and online recycling of oil products without deviating from the production process of the internal mixing system, meets the environmental protection requirements, and reduces the redundant links of waste oil collection, transportation, temporary storage and management.

Description

Technical Field

[0001] This invention relates to the field of waste oil recycling technology, and in particular to an online purification and recycling method and apparatus for rotor sealing oil. Background Technology

[0002] Internal mixers are widely used mixing equipment in the rubber and plastics industries, and rotor sealing oil is the key to ensuring that the internal mixer rotor can operate normally, stably, and for a long period of time.

[0003] If a large amount of mechanical impurities such as colloids are mixed into the rotor sealing oil during operation, it can easily cause wear on the rotor and gears, affecting the stable operation of the equipment.

[0004] Currently, waste oil collection in internal mixer systems mainly takes two forms: either an oil collection trough is placed at the oil outlet at the bottom of the internal mixer for collection, and then the oil is transferred to a waste oil bucket, or the internal mixer system discharges directly into the waste oil collection bucket through pipeline connection. However, both of these methods are offline collection methods, which are separate from the online production process and cannot achieve online purification and reuse. Furthermore, offline collection and purification increase the labor cost of waste oil collection. Summary of the Invention

[0005] This invention provides an online purification and recycling method and apparatus for rotor sealing oil, addressing the shortcomings of related technologies that cannot purify and reuse rotor sealing oil online, leading to high costs. Without deviating from the internal mixing system's production process, it constructs a closed-loop recycling system for the entire process of online collection, purification, and reuse of oil. This not only meets environmental compliance requirements but also reduces redundant steps in waste oil collection, transfer, temporary storage, and management. It achieves a highly efficient "production-purification-reuse" operation mode for sealing oil while simultaneously reducing management costs.

[0006] This invention provides a method for online purification and recovery of rotor sealing oil, comprising: Obtain the waste rotor sealing oil to be processed from the internal mixer; The waste rotor sealing oil is subjected to preliminary impurity removal and dehydration. The waste rotor sealing oil is heated by a combination of steam heating and electromagnetic heating, and the heated waste rotor sealing oil is then dehydrated under vacuum. After the moisture content of the waste rotor sealing oil reaches the standard, it is filtered and impurities are removed by centrifugal separation. The waste rotor sealing oil is recycled after its metal abrasive particle index meets the requirements.

[0007] According to the online purification and recycling method for rotor sealing oil provided by the present invention, the step of heating the waste rotor sealing oil by a combination of steam heating and electromagnetic heating includes: The waste rotor sealing oil is preheated by steam coils. An electromagnetic heating device is used to precisely control the temperature of the preheated rotor sealing oil, so that the temperature of the waste rotor sealing oil is controlled at 63 to 67 degrees Celsius.

[0008] According to the online purification and recycling method for rotor sealing oil provided by the present invention, the step of vacuum dehydrating the heated waste rotor sealing oil includes: The water content of the waste rotor sealing oil is detected in real time; When the detected water content is greater than 0.1%, the vacuum degree of vacuum dehydration is controlled at -0.08MPa to prevent violent vaporization of water under high vacuum, which could lead to boiling and oil spillage. When the water content of the oil is detected to be below 0.1%, the vacuum degree is adjusted to -0.095MPa to achieve high-precision dehydration.

[0009] According to the online purification and recycling method for rotor sealing oil provided by the present invention, the step of filtering and removing impurities by centrifugal separation after the moisture content of the waste rotor sealing oil reaches the standard includes: After the water content of the waste rotor sealing oil is lower than 0.03%, it is filtered and impurities are removed by centrifugation.

[0010] According to the online purification and recovery method for rotor sealing oil provided by the present invention, the step of filtering and removing impurities by centrifugal separation includes: Start the centrifuge, and after the centrifuge reaches the set speed, input the waste rotor sealing oil into the centrifuge for centrifugation treatment for the set time.

[0011] According to the online purification and recycling method for rotor sealing oil provided by the present invention, the step of recycling the waste rotor sealing oil after the metal abrasive particle index meets the requirements includes: If the metal abrasive particle index of the waste rotor sealing oil is lower than the set threshold, the index is determined to be qualified, and the treated rotor sealing oil is recycled. If the metal abrasive particle index of the waste rotor sealing oil is higher than the set threshold, the index is determined to be unqualified, and the cycle purification continues.

[0012] The present invention also provides an online purification and recycling device for rotor sealing oil, including a waste oil collection system, a purification system and a reuse system; The waste oil collection system includes a waste oil collection pipe connected to the waste rotor sealing oil outlet of each internal mixer, and a storage tank for oil to be purified connected to the waste oil collection pipe. The purification system includes a pre-filtration unit, a heating device, a vacuum dehydration unit, and a centrifugal separation unit connected in sequence by pipelines. The oil outlet of the oil storage tank to be purified is connected to the inlet of the pre-filtration unit via a transfer pump. The recycling system includes a finished oil storage tank. The inlet of the finished oil storage tank is connected to the purified oil outlet of the centrifugal separation unit, and the outlet of the finished oil storage tank is connected to the main oil tank of the internal mixer through a recycling pipeline and a recycling pump.

[0013] According to the rotor sealing oil online purification and recovery device provided by the present invention, the oil storage tank to be purified, the pre-filtration unit and the finished oil storage tank are respectively equipped with steam heating devices; The purification system is also equipped with an electromagnetic heating device, which is installed on the pipeline between the pre-filtration unit and the vacuum dehydration unit, for secondary heating and precise temperature control of the oil.

[0014] The rotor sealing oil online purification and recovery device provided by the present invention also includes a PLC control system; The PLC control system is used to obtain the liquid levels of the oil to be purified storage tank and the finished oil storage tank, and automatically starts the delivery pump to supply oil to the purification system when the liquid level of the oil to be purified storage tank reaches 60%. When the liquid level in the oil storage tank to be purified drops to 10%, the oil pump will be stopped by the interlock. When the liquid level in the oil storage tank reaches 90%, the oil inlet pipe will be automatically shut off and the system will switch to the standby storage tank. When the liquid level in the refined oil storage tank reaches 90%, the oil inlet pump will be automatically shut off and the system will switch to the standby refined oil storage tank. When the liquid level in the finished oil storage tank reaches 60%, the reuse pump will automatically start to supply oil to the main oil tank of the internal mixer. When the liquid level in the refined oil storage tank drops to 10%, the reuse pump will automatically shut down.

[0015] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement any of the above-described methods for online purification and recovery of rotor sealing oil.

[0016] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described methods for online purification and recovery of rotor sealing oil.

[0017] The present invention also provides a computer program product, including a computer program, which, when executed by a processor, implements any of the above-described methods for online purification and recovery of rotor sealing oil.

[0018] The rotor sealing oil online purification and recycling method provided by this invention integrates a purely physical process chain of "pre-filtration to remove impurities and water, steam-electromagnetic composite gradient heating, gradient vacuum dehydration, and centrifugal separation" to construct an online closed-loop purification system from source collection to end-use. This not only completely eliminates consumables such as filter elements and filter bags, eliminating the risk of clogging and hazardous waste generation from the source, but also makes full use of waste heat from the factory to significantly reduce energy consumption. At the same time, through precise temperature control (65℃±2℃) and gradient vacuum strategy, it prevents secondary oxidation and boiling of the oil, ensuring the purification accuracy and quality of high-viscosity sealing oil. Ultimately, it realizes the uninterrupted recycling of sealing oil during the internal refining process, effectively solving the industry pain points of low efficiency, high cost, and heavy environmental compliance pressure caused by offline processing, achieving the dual goals of cost reduction and efficiency improvement and clean production. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is one of the schematic flowcharts of the online purification and recovery method for rotor sealing oil provided in the embodiments of the present invention; Figure 2 This is the second schematic diagram of the online purification and recovery method for rotor sealing oil provided in this embodiment of the invention; Figure 3 This is a schematic diagram of the structure of the rotor sealing oil online purification and recovery device provided in an embodiment of the present invention; Figure 4 This is a cross-sectional view of the oil storage tank to be purified provided in an embodiment of the present invention; Figure 5 This is a top view of the oil storage tank to be purified provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the physical structure of the electronic device provided in an embodiment of the present invention.

[0021] in: 1-Oil storage tank to be purified; 2-Steam heating coil; 3-Ladder; 4-Air inlet; 5-Steam outlet; 6-Drain outlet; 7-Oil outlet; 8-Manhole; 9-Variable frequency motor; 10-Oil inlet; 11-Radar level gauge; 12-Float level gauge; 13-Stirring shaft; 16-Stirring paddle. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] Figure 1 This is one of the flowcharts of the online purification and recovery method for rotor sealing oil provided in the embodiments of the present invention.

[0024] Figure 2 This is the second schematic diagram of the online purification and recovery method for rotor sealing oil provided in the embodiments of the present invention.

[0025] like Figure 1 and Figure 2 As shown, this embodiment provides a method for online purification and recovery of rotor sealing oil, including: Step 101: Obtain the waste rotor sealing oil to be processed from the internal mixer; Step 102: Perform preliminary deimpurity and dehydration on the waste rotor sealing oil; Step 103: The waste rotor sealing oil is heated by a combination of steam heating and electromagnetic heating, and the heated waste rotor sealing oil is then dehydrated under vacuum. In practical applications, the waste rotor sealing oil can be preheated using a steam coil. An electromagnetic heating device is used to precisely control the temperature of the preheated rotor sealing oil, so that the temperature of the waste rotor sealing oil is controlled at 63 to 67 degrees Celsius.

[0026] Step 104: After the moisture content of the waste rotor sealing oil reaches the standard, it is filtered and impurities are removed by centrifugal separation. Specifically, the water content of the waste rotor sealing oil can be detected in real time; When the detected water content is greater than 0.1%, the vacuum degree of vacuum dehydration is controlled at -0.08MPa to prevent violent vaporization of water under high vacuum, which could lead to boiling and oil spillage. When the water content of the oil is detected to be below 0.1%, the vacuum degree is adjusted to -0.095MPa to achieve high-precision dehydration; Furthermore, once the water content of the waste rotor sealing oil is below 0.03%, it is filtered and impurities are removed by centrifugal separation.

[0027] In practice, during centrifugal separation, the centrifuge can be started first. After the centrifuge speed reaches the set speed, the waste rotor sealing oil can be input into the centrifuge for centrifugation treatment for a set time.

[0028] Step 105: After the metal abrasive particle index of the waste rotor sealing oil meets the requirements, it is recycled and reused.

[0029] If the metal abrasive particle index of the waste rotor sealing oil is lower than the set threshold, the index is determined to be qualified, and the treated rotor sealing oil is recycled. If the metal abrasive particle index of the waste rotor sealing oil is higher than the set threshold, the index is determined to be unqualified, and the cycle purification continues.

[0030] Specifically, when the metal abrasive particle index is below the threshold, the purified oil's technical indicators are qualified and it can be transported to the finished oil storage tank. When the metal abrasive particle index of the purified oil is above the threshold, circulation purification is initiated. After circulation purification for a certain period of time, the metal abrasive particle index meets the standard and is introduced into the finished oil storage tank. If the metal abrasive particle index still does not meet the standard after 30-60 minutes of circulation purification, offline monitoring (GB / T511) is initiated to test the mechanical impurity index. If the mechanical impurity index meets the requirements, it is introduced into the finished oil storage tank. If it does not meet the requirements, circulation continues until the index meets the preset standard. Then, the purified index is qualified and can be injected into the finished oil storage tank.

[0031] The metal abrasive parameters can include particle size and particle number.

[0032] The rotor sealing oil online purification and recovery device provided by the present invention is described below. The rotor sealing oil online purification and recovery device described below can be referred to in correspondence with the rotor sealing oil online purification and recovery method described above.

[0033] The rotor sealing oil online purification and recycling device provided in this embodiment includes a waste oil collection system, a purification system, and a reuse system; The waste oil collection system includes a waste oil collection pipe connected to the waste rotor sealing oil outlet of each internal mixer, and a storage tank for oil to be purified connected to the waste oil collection pipe. The purification system includes a pre-filtration unit, a heating device, a vacuum dehydration unit, and a centrifugal separation unit connected in sequence by pipelines. The oil outlet of the oil storage tank to be purified is connected to the inlet of the pre-filtration unit via a transfer pump. The recycling system includes a finished oil storage tank. The inlet of the finished oil storage tank is connected to the purified oil outlet of the centrifugal separation unit, and the outlet of the finished oil storage tank is connected to the main oil tank of the internal mixer through a recycling pipeline and a recycling pump.

[0034] In practical applications, steam heating devices are installed in the oil storage tank to be purified, the pre-filtration unit, and the finished oil storage tank. This fully utilizes the waste heat recovered on-site to heat the oil. At the same time, in order to ensure that the oil temperature remains stable and meets the standards during the purification process, the equipment is also equipped with an electromagnetic heating device as a precise temperature control and backup guarantee, forming a "steam waste heat recovery - electromagnetic heating supplement" model, which greatly reduces the energy consumption of the equipment for purification. The entire purification process adopts a purely physical purification technology. No consumables such as filter elements, filter bags, or adsorbents are used during the purification process. No secondary pollutants such as waste filter elements or waste adsorbents are generated, and there is no new hazardous waste discharge, thus eliminating environmental compliance pressure from the source.

[0035] Figure 3 This is a schematic diagram of the structure of the rotor sealing oil online purification and recovery device provided in an embodiment of the present invention.

[0036] like Figure 3 As shown, the oil storage tank 1 is equipped with a frequency converter-controlled electric stirring device and uses steam heating. A steam heating coil 2 is coiled around the outside of the tank to ensure uniform heating. The steam enters from the air inlet 4 at the top of the tank and exits from the steam outlet 5 at the bottom. The tank is insulated with thermal insulation felt. An oil outlet is located at the bottom of the tank. During operation, an oil pump draws oil from the outlet 7 to subsequent processes. A drain outlet 6 is located at the bottom of the tank to periodically remove bottom sediment or drain oil from the tank. The tank is equipped with a ladder 3 for easy maintenance. A manhole 8 is located at the top of the tank for personnel to enter for inspection. An oil inlet 10 is located at the top of the tank, through which the oil to be purified or finished oil is introduced. The tank is also equipped with a radar level gauge 11 and a float level gauge 12. The tank is set to low level (10%), high level (60%), and very high level (90%).

[0037] The rotor sealing oil online purification and recovery device provided in this embodiment also includes a PLC control system. The PLC control system collects the tank liquid level signal in real time through radar liquid level gauge and float liquid level gauge to realize liquid level linkage control, improve the reliability and safety of liquid level detection, and prevent liquid level runaway, overflow, and cavitation.

[0038] Specifically, the PLC control system is used to obtain the liquid levels of the oil to be purified storage tank and the finished oil storage tank, and automatically start the delivery pump to supply oil to the purification system when the liquid level of the oil to be purified storage tank reaches 60% liquid level. When the liquid level in the oil storage tank to be purified drops to 10%, the oil pump will be stopped by the interlock. When the liquid level in the oil storage tank reaches 90%, the oil inlet pipe will be automatically shut off and the system will switch to the standby storage tank. When the liquid level in the refined oil storage tank reaches 90%, the oil inlet pump will be automatically shut off and the system will switch to the standby refined oil storage tank. When the liquid level in the finished oil storage tank reaches 60%, the reuse pump will automatically start to supply oil to the main oil tank of the internal mixer. When the liquid level in the refined oil storage tank drops to 10%, the reuse pump will automatically shut down.

[0039] Figure 4 This is a cross-sectional view of the oil storage tank to be purified provided in an embodiment of the present invention; Figure 5 This is a top view of the oil storage tank to be purified provided in an embodiment of the present invention; like Figure 4 and Figure 5 As shown, the oil storage tank to be purified is also equipped with a variable frequency stirring motor 9, and a stirring shaft 13 and a stirring paddle 16 are also installed.

[0040] The specific implementation method of the rotor sealing oil online purification and recovery device provided in this embodiment can be implemented with reference to the above embodiment, and will not be repeated here.

[0041] Figure 6 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 6 As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630, and a communication bus 640, wherein the processor 610, the communication interface 620, and the memory 630 communicate with each other via the communication bus 640. The processor 610 can call logical instructions in the memory 630 to execute an online purification and recovery method for rotor sealing oil, which includes: Obtain the waste rotor sealing oil to be processed from the internal mixer; The waste rotor sealing oil is subjected to preliminary impurity removal and dehydration. The waste rotor sealing oil is heated by a combination of steam heating and electromagnetic heating, and the heated waste rotor sealing oil is then dehydrated under vacuum. After the moisture content of the waste rotor sealing oil reaches the standard, it is filtered and impurities are removed by centrifugal separation. The waste rotor sealing oil is recycled after its metal abrasive particle index meets the requirements.

[0042] Furthermore, the logical instructions in the aforementioned memory 630 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0043] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to perform the rotor sealing oil online purification and recovery method provided by the above methods, the method comprising: Obtain the waste rotor sealing oil to be processed from the internal mixer; The waste rotor sealing oil is subjected to preliminary impurity removal and dehydration. The waste rotor sealing oil is heated by a combination of steam heating and electromagnetic heating, and the heated waste rotor sealing oil is then dehydrated under vacuum. After the moisture content of the waste rotor sealing oil reaches the standard, it is filtered and impurities are removed by centrifugal separation. The waste rotor sealing oil is recycled after its metal abrasive particle index meets the requirements.

[0044] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the online purification and recovery method for rotor sealing oil provided by the methods described above, the method comprising: Obtain the waste rotor sealing oil to be processed from the internal mixer; The waste rotor sealing oil is subjected to preliminary impurity removal and dehydration. The waste rotor sealing oil is heated by a combination of steam heating and electromagnetic heating, and the heated waste rotor sealing oil is then dehydrated under vacuum. After the moisture content of the waste rotor sealing oil reaches the standard, it is filtered and impurities are removed by centrifugal separation. The waste rotor sealing oil is recycled after its metal abrasive particle index meets the requirements.

[0045] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0046] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for online purification and recovery of rotor sealing oil, characterized in that, include: Obtain the waste rotor sealing oil to be processed from the internal mixer; The waste rotor sealing oil is subjected to preliminary impurity removal and dehydration; The waste rotor sealing oil is heated by a combination of steam heating and electromagnetic heating, and the heated waste rotor sealing oil is then dehydrated under vacuum. After the moisture content of the waste rotor sealing oil reaches the standard, it is filtered and impurities are removed by centrifugal separation. The waste rotor sealing oil is recycled after its metal abrasive particle index meets the requirements.

2. The method for online purification and recovery of rotor sealing oil according to claim 1, characterized in that, The method of heating the waste rotor sealing oil by combining steam heating and electromagnetic heating includes: The waste rotor sealing oil is preheated by steam coils. An electromagnetic heating device is used to precisely control the temperature of the preheated rotor sealing oil, so that the temperature of the waste rotor sealing oil is controlled at 63 to 67 degrees Celsius.

3. The method for online purification and recovery of rotor sealing oil according to claim 1, characterized in that, The process of vacuum dehydrating the heated waste rotor sealing oil includes: The water content of the waste rotor sealing oil is detected in real time; When the detected water content is greater than 0.1%, the vacuum degree of vacuum dehydration is controlled at -0.08MPa to prevent violent vaporization of water under high vacuum, which could lead to boiling and oil spillage. When the water content of the oil is detected to be below 0.1%, the vacuum degree is adjusted to -0.095MPa to achieve high-precision dehydration.

4. The method for online purification and recovery of rotor sealing oil according to claim 1, characterized in that, After the moisture content of the waste rotor sealing oil reaches the standard, it is filtered and impurities are removed by centrifugal separation, including: After the water content of the waste rotor sealing oil is lower than 0.03%, it is filtered and impurities are removed by centrifugal separation.

5. The method for online purification and recovery of rotor sealing oil according to claim 1 or 4, characterized in that, The process of filtering and removing impurities by centrifugation includes: Start the centrifuge, and after the centrifuge reaches the set speed, input the waste rotor sealing oil into the centrifuge for centrifugation treatment for the set time.

6. The method for online purification and recovery of rotor sealing oil according to claim 1, characterized in that, The process of recycling the waste rotor sealing oil after the metal abrasive particle index meets the requirements includes: If the metal abrasive particle index of the waste rotor sealing oil is lower than the set threshold, the index is determined to be qualified, and the treated rotor sealing oil is recycled. If the metal abrasive particle index of the waste rotor sealing oil is higher than the set threshold, the index is determined to be unqualified, and the cycle purification continues.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the online purification and recovery method for rotor sealing oil as described in any one of claims 1-6.

8. An online purification and recovery device for rotor sealing oil, characterized in that, This includes waste oil collection systems, purification systems, and reuse systems; The waste oil collection system includes a waste oil collection pipe connected to the waste rotor sealing oil outlet of each internal mixer, and a storage tank for oil to be purified connected to the waste oil collection pipe. The purification system includes a pre-filtration unit, a heating device, a vacuum dehydration unit, and a centrifugal separation unit connected in sequence by pipelines. The oil outlet of the oil storage tank to be purified is connected to the inlet of the pre-filtration unit via a transfer pump. The recycling system includes a finished oil storage tank. The inlet of the finished oil storage tank is connected to the purified oil outlet of the centrifugal separation unit, and the outlet of the finished oil storage tank is connected to the main oil tank of the internal mixer through a recycling pipeline and a recycling pump.

9. The rotor sealing oil online purification and recovery device according to claim 8, characterized in that, The oil storage tank to be purified, the pre-filtration unit and the finished oil storage tank are each equipped with a steam heating device. The purification system is also equipped with an electromagnetic heating device, which is installed on the pipeline between the pre-filtration unit and the vacuum dehydration unit, for secondary heating and precise temperature control of the oil.

10. The rotor sealing oil online purification and recovery device according to claim 8, characterized in that, It also includes a PLC control system; The PLC control system is used to obtain the liquid levels of the oil to be purified storage tank and the finished oil storage tank, and automatically starts the delivery pump to supply oil to the purification system when the liquid level of the oil to be purified storage tank reaches 60%. When the liquid level in the oil storage tank to be purified drops to 10%, the oil pump will be stopped by the interlock. When the liquid level in the oil storage tank reaches 90%, the oil inlet pipe will be automatically shut off and the system will switch to the standby storage tank. When the liquid level in the refined oil storage tank reaches 90%, the oil inlet pump will be automatically shut off and the system will switch to the standby refined oil storage tank. When the liquid level in the finished oil storage tank reaches 60%, the reuse pump will automatically start to supply oil to the main oil tank of the internal mixer. When the liquid level in the refined oil storage tank drops to 10%, the reuse pump will automatically shut down.

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