Cleaning system

Abstract

The invention discloses a cleaning system which comprises n stages of cleaning tanks arranged in sequence and n stages of auxiliary tanks arranged on the n stages of cleaning tanks respectively, the auxiliary tanks are communicated with the cleaning tanks, and a product to be cleaned is conveyed from the first stage of cleaning tank to the nth stage of cleaning tank; the cleaning system further comprises a waste liquid recycling module. The waste liquid recovery module comprises a first mixing tank, a liquid storage tank and a membrane separator which are connected in sequence, and part of the auxiliary tanks close to the nth-stage auxiliary tank are connected to the first mixing tank and used for collecting waste liquid into the first mixing tank to obtain mixed liquid; the liquid storage tank collects the mixed liquid conveyed by the first mixing tank and conveys the mixed liquid to the membrane separator, and the membrane separator is used for separating the mixed liquid to obtain a recovered solvent and recovered active components; and the recovered solvent and the recovered active component flow back to the cleaning tank for cyclic utilization. By means of the cleaning system, the production cost can be reduced, resource waste can be reduced, and green production can be achieved.

Description

Technical Field

[0001] This invention relates to the field of product cleaning technology, and in particular to a cleaning system. Background Technology

[0002] During CNC (Computer Numerical Control) machining, the products need to be cleaned. In existing cleaning lines, the cleaning agents used are typically disposable, requiring continuous input of new agents during the cleaning process. This results in high consumption of cleaning agents, especially in the spray cleaning stage, leading to high production costs and resource waste.

[0003] Therefore, it is essential to provide a cleaning system that can reduce production costs and minimize resource waste. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems and provide a cleaning system. This cleaning system can be used to clean products processed by CNC machining, reducing production costs and resource waste, and contributing to green production.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This invention provides a cleaning system comprising n-stage cleaning tanks arranged in sequence and n-stage auxiliary tanks respectively disposed on the n-stage cleaning tanks. The auxiliary tanks are connected to the cleaning tanks, and the product to be cleaned is transferred from the first-stage cleaning tank to the n-stage cleaning tank. The cleaning system also includes a waste liquid recovery module. The waste liquid recovery module includes a first mixing tank, a storage tank, and a membrane separator connected in sequence. A portion of the auxiliary tanks located near the n-stage cleaning tank are respectively connected to the first mixing tank to collect waste liquid into the first mixing tank to obtain a mixed liquid. The storage tank collects the mixed liquid transported from the first mixing tank and then transports it to the membrane separator. The membrane separator is used to separate the mixed liquid to obtain recovered solvent and recovered active ingredients. The obtained recovered solvent and recovered active ingredients are returned to the cleaning tank for recycling.

[0006] Optionally, the waste liquid recovery module further includes a pretreatment unit disposed between the first mixing tank and the storage tank; the pretreatment unit includes at least one of a filter, a magnetic separator, or a centrifugal clarifier, wherein the filter is used to remove metal debris and dust from the mixed liquid, the magnetic separator is used to remove ferromagnetic particles from the mixed liquid, and the centrifugal clarifier is used to remove micron-sized suspended solids from the mixed liquid.

[0007] Optionally, the membrane separator is a reverse osmosis membrane separator, and a pressure pump is provided between the storage tank and the membrane separator; the pure water end of the reverse osmosis membrane separator produces the recovered solvent, and the concentrated water end of the reverse osmosis membrane separator produces the concentrated component.

[0008] Optionally, the waste liquid recovery module further includes a reagent regeneration unit located at the concentrate end of the reverse osmosis membrane separator; the reagent regeneration unit includes a reagent regeneration tank connected to the concentrate end of the reverse osmosis membrane separator, a reagent detection component for detecting the mixture in the reagent regeneration tank, and a replenishment tank for replenishing reagents to the reagent regeneration tank based on the detection results of the reagent detection component.

[0009] Optionally, the cleaning system further includes a chemical supply unit and a water supply unit. The chemical supply unit is used to supply cleaning agent to the cleaning tank, and the water supply unit is used to supply water to the n-stage cleaning tank and the chemical supply unit respectively. The water supply unit causes water to flow from the n-stage cleaning tank to the 1-stage cleaning tank. The pure water end of the reverse osmosis membrane separator is connected to the water supply unit to transport the produced recycled solvent to the water supply unit.

[0010] Optionally, the agent supply unit includes a agent tank, a dosing motor, a agent reservoir, and a second mixing tank connected in sequence, the second mixing tank being connected to the water supply unit; the agent in the agent tank is transported to the agent reservoir via the dosing motor, the agent reservoir transports the agent to the second mixing tank, the water supply unit supplies water to the second mixing tank, and the agent and water are mixed in the second mixing tank to obtain a cleaning agent.

[0011] Optionally, the cleaning system further includes a wastewater tank connected to a secondary tank that is not connected to the first mixing tank.

[0012] Optionally, the sub-tanks connected to the first mixing tank are connected in series with each other, and the remaining sub-tanks are connected in overflow communication.

[0013] Optionally, the cleaning system further includes a detection module; the detection module includes a conductivity sensor, a concentration sensor, a pH sensor, and a liquid level sensor. The chemical tank and the cleaning tank are both equipped with conductivity sensors, concentration sensors, and pH sensors, and the chemical tank and the first-stage cleaning tank are also equipped with liquid level sensors.

[0014] Optionally, the cleaning system includes a 5-stage cleaning tank and a 5-stage auxiliary tank, with the 3rd to 5th stage auxiliary tanks respectively connected to the waste liquid recovery module, and the 1st and 2nd stage auxiliary tanks connected to the sewage tank.

[0015] The beneficial effects of this invention include at least the following: The cleaning system of this invention includes a waste liquid recovery module. Based on the transfer sequence of the products to be cleaned within the cleaning system, the waste liquid generated by the cleaning tank located near the first-stage cleaning tank has a higher degree of contamination than the waste liquid generated by the cleaning tank located near the nth-stage cleaning tank. The waste liquid recovery module is selectively connected to a secondary tank located near the nth-stage cleaning tank to recover and recycle the less contaminated waste liquid. This reduces the amount of new cleaning liquid added during the cleaning process, lowers the amount of cleaning liquid used for CNC-machined products, reduces production costs, and minimizes resource waste. Simultaneously, the selective treatment of the generated waste liquid balances the difficulty of waste liquid recycling and the impact of regenerated cleaning liquid on the cleaning effect, avoiding any negative impact of regenerated cleaning agents on product cleaning quality. Attached Figure Description

[0016] Figure 1 This is a layout diagram of the cleaning system of the present invention.

[0017] Figure 2 This is a process flow diagram of the waste liquid recycling process described in this invention, which involves treating the received waste liquid.

[0018] Figure 3 This is a process flow diagram of the reagent regeneration unit of the present invention for processing the recovered solvent produced at the concentrate end of the reverse osmosis membrane separator. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0020] In this invention, the use of terms such as "first" and "second" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0021] This invention provides a cleaning system that can be used to clean products processed by CNC machining. (See also...) Figure 1As shown, the cleaning system includes n-stage cleaning tanks arranged in sequence and n-stage auxiliary tanks respectively disposed on the n-stage cleaning tanks. The auxiliary tanks are connected to the cleaning tanks, and the product to be cleaned is transferred from the first-stage cleaning tank to the n-stage cleaning tank. The cleaning system also includes a waste liquid recovery module, which is used to recover and recycle the cleaning liquid in a portion of the auxiliary tanks located near the n-stage cleaning tank. The waste liquid recovery module includes a first mixing tank, a storage tank, and a membrane separator connected in sequence. The auxiliary tanks located near the n-stage auxiliary tanks are respectively connected to the first mixing tank to collect waste liquid into the first mixing tank to obtain a mixed liquid. The storage tank collects the mixed liquid transported by the first mixing tank and then transports it to the membrane separator. The membrane separator is used to separate the mixed liquid to obtain recovered solvent and recovered active ingredients. The obtained recovered solvent and recovered active ingredients are returned to the cleaning tank for recycling.

[0022] The cleaning system of this invention includes a waste liquid recovery module. Based on the transfer sequence of the products to be cleaned within the cleaning system, the waste liquid generated by the cleaning tank located near the first-stage cleaning tank has a higher degree of contamination than the waste liquid generated by the cleaning tank located near the nth-stage cleaning tank. The waste liquid recovery module is selectively connected to a secondary tank located near the nth-stage cleaning tank to recover and recycle the less contaminated waste liquid. This reduces the amount of new cleaning liquid added during the cleaning process, lowers the amount of cleaning liquid used for CNC-machined products, reduces production costs, and minimizes resource waste. Simultaneously, the selective treatment of the generated waste liquid balances the difficulty of waste liquid recycling and the impact of regenerated cleaning liquid on the cleaning effect, avoiding any negative impact of regenerated cleaning agents on product cleaning quality.

[0023] The waste liquid recovery module further includes a pretreatment unit disposed between the first mixing tank and the storage tank. The pretreatment unit is used to remove impurities from the mixed liquid in the first mixing tank. The pretreatment unit includes at least one of a filter, a magnetic separator, or a centrifugal clarifier. The filter is used to remove metal debris and dust from the mixed liquid, the magnetic separator is used to remove ferromagnetic particles from the mixed liquid, and the centrifugal clarifier is used to remove micron-sized suspended solids from the mixed liquid.

[0024] Specifically, the filter is a self-cleaning filter, capable of filtering metal shavings and dust with a particle size of 50±5μm. The magnetic separator is suitable for machining environments. The centrifugal clarifier separates micron-sized suspended solids to prevent the mixed liquid from clogging the membrane separator. When the pretreatment unit includes the filter, the magnetic separator, and the centrifugal clarifier, the pretreatment unit can perform three-stage pretreatment on the mixed liquid, making it suitable for various CNC machining environments. Physical impurity removal is used to thoroughly remove impurities from the mixed liquid, ensuring the quality of the subsequently obtained recovered solvent and active ingredients.

[0025] In some embodiments, the membrane separator is a reverse osmosis membrane separator, and a pressure pump is provided between the storage tank and the membrane separator; the pure water end of the reverse osmosis membrane separator produces the recovered solvent, and the concentrated water end of the reverse osmosis membrane separator produces the concentrated component. In this invention, a reverse osmosis membrane separator is selected to separate the waste liquid mixture collected in the first mixing tank, targeting water-based cleaning agents commonly used in CNC machining. This achieves efficient separation of water and active ingredients in the waste liquid mixture, with energy consumption far lower than evaporation separation, saving energy. Furthermore, the recovered water produced by the pure water end of the reverse osmosis membrane separator has a purity close to pure water, a conductivity <50μS / cm, and a neutral pH, allowing for direct reuse; the reverse osmosis membrane separator fully utilizes the components of the recovered waste liquid. See also Figure 2 As shown, the waste liquid recovery module of the present invention processes the received waste liquid through the following steps: the waste liquid is fed into the first mixing tank to obtain a mixed liquid; the pretreatment unit is used to remove impurities from the mixed liquid in the first mixing tank; the storage tank collects the mixed liquid transported from the first mixing tank and then transports it to the membrane separator; the pure water end of the reverse osmosis membrane separator produces the recovered solvent, and the concentrate end of the reverse osmosis membrane separator produces a concentrated component; the recovered solvent produced at the pure water end of the reverse osmosis membrane separator is directly reused; the reagent regeneration tank receives the concentrated component produced at the concentrate end of the reverse osmosis membrane separator and reuses the obtained concentrated component.

[0026] The waste liquid recovery module further includes a reagent regeneration unit located at the concentrate end of the reverse osmosis membrane separator; the reagent regeneration unit includes a reagent regeneration tank connected to the concentrate end of the reverse osmosis membrane separator, a reagent detection component for detecting the mixture in the reagent regeneration tank, and a replenishment tank for replenishing reagents to the reagent regeneration tank based on the detection results of the reagent detection component. See also Figure 3As shown, in use, the reagent regeneration tank receives the concentrated component generated from the concentrate end of the reverse osmosis membrane separator. The reagent detection component detects the liquid in the reagent regeneration tank. If the concentrated component in the reagent regeneration tank meets the recycling standard after detection by the reagent detection component, the reagent regeneration tank directly adds the concentrated component to the cleaning tank. If the concentrated component in the reagent regeneration tank does not meet the recycling standard after detection by the reagent detection component, the replenishment tank adds reagent to the reagent regeneration tank based on the detection result of the reagent detection component until the reagent in the reagent regeneration tank meets the process requirements. Then, the reagent regeneration tank transports the regeneration cleaning agent to the cleaning tank for recycling. Optionally, the reagent regeneration tank can transport the regeneration cleaning agent to at least one of the cleaning tanks connected to the first mixing tank. The reagent detection component includes a concentration sensor, a pH sensor, and a conductivity sensor to detect the concentration, pH, and conductivity of the liquid in the reagent regeneration tank. The replenishment tank can be used to add alkali solution to the chemical regeneration tank. If the oil content of the liquid in the chemical regeneration tank is high, the replenishment tank can also be used to add demulsifier. A chemical regeneration unit is set at the concentrate end of the reverse osmosis membrane separator to restore the activity and compound the concentrated components at the concentrate end, so that the regenerated chemicals output by the chemical regeneration unit meet the process requirements and avoid product defects caused by the addition of recycled chemicals. During long-term use, a "recovery rate-replenishment amount-cleaning effect" model can be established based on the data accumulation of the detection data of the chemical detection component to continuously optimize the regeneration formula.

[0027] The cleaning system further includes a chemical supply unit and a water supply unit. The chemical supply unit supplies cleaning agent to the cleaning tank, and the water supply unit supplies water to both the n-stage cleaning tank and the chemical supply unit, allowing water to flow from the n-stage cleaning tank to the 1-stage cleaning tank. The pure water end of the reverse osmosis membrane separator is connected to the water supply unit to transport the recovered solvent produced thereto. A flow meter and a proportional valve are provided between the water supply unit and the n-stage auxiliary tank. A proportional valve is also provided at the inlet of each of the n-stage auxiliary tanks.

[0028] The reagent supply unit includes a reagent tank, a dosing motor, a reagent reservoir, and a second mixing tank connected in sequence. The second mixing tank is connected to the water supply unit. The reagent in the reagent tank is transported to the reagent reservoir via the dosing motor. The reagent reservoir then transports the reagent to the second mixing tank. The water supply unit supplies water to the second mixing tank. The reagent and water mix in the second mixing tank to obtain a cleaning agent. A flow meter and a solenoid valve are provided between the water supply unit and the second mixing tank.

[0029] The cleaning system also includes a wastewater tank connected to a secondary tank not connected to the first mixing tank. In this invention, the cleaning agent in the n-stage cleaning tank is graded. The product to be cleaned enters the cleaning system from the first-stage cleaning tank, is cleaned sequentially by the first-stage and n-stage cleaning tanks, and then exits from the n-stage cleaning tank. The cleaning wastewater generated from the cleaning tank that performs the initial cleaning of the product to be cleaned has a higher degree of contamination than the cleaning wastewater generated from the cleaning tank that performs the subsequent fine cleaning operation. The wastewater with a higher degree of contamination is directly transferred to the wastewater tank for recycling and does not participate in subsequent recycling and reuse. This avoids diluting the subsequent wastewater with higher recycling value and lower contamination level with highly contaminated wastewater, thus improving recycling efficiency. In this way, by grading the cleaning liquid according to its degree of contamination, and then directly discharging or recycling cleaning liquids of different contamination levels, a balance is struck between recycling value and wastewater treatment. Unnecessary wastewater recycling is avoided, production costs are reduced, and green production is achieved. The wastewater pond collects and treats highly polluted wastewater in a unified manner, avoiding direct discharge of wastewater and its pollution to the environment.

[0030] The secondary tanks connected to the first mixing tank are interconnected in series, and the remaining secondary tanks are interconnected by overflow. In this invention, the interconnection structures between secondary tanks generating waste liquids with different levels of contamination are separately configured. Connecting the secondary tanks connected to the first mixing tank in series achieves uniformity of liquid level and solution among the interconnected secondary tanks, ensuring cleaning effectiveness and system stability. The overflow connection between secondary tanks with higher levels of contamination ensures normal water flow and maintains a stable cleaning agent concentration in the corresponding cleaning tanks, thus avoiding cross-contamination between cleaning tanks and improving overall cleaning efficiency.

[0031] The cleaning system also includes a detection module for monitoring the state of the chemicals in the chemical supply unit and the cleaning tank. The detection module includes a conductivity sensor, a concentration sensor, a pH sensor, and a level sensor. Both the chemical supply tank and the cleaning tank are equipped with conductivity, concentration, and pH sensors, and the chemical supply tank and the first-stage cleaning tank are also equipped with level sensors. The detection module performs real-time monitoring of the chemicals in the chemical supply unit and the cleaning tank, ensuring that the chemicals meet process requirements.

[0032] In some embodiments, the cleaning system includes a 5-stage cleaning tank and a 5-stage auxiliary tank. The 3rd to 5th stage auxiliary tanks are connected to the wastewater recovery module, and the 1st and 2nd stage auxiliary tanks are connected to the wastewater tank. Optionally, in some embodiments, the 3rd to 5th stage auxiliary tanks are each connected to the first mixing tank via independent pipes, and the 1st and 2nd stage auxiliary tanks are each connected to the wastewater tank via independent pipes. Regenerated cleaning agent is returned to the 3rd and / or 4th stage cleaning tanks. The 1st and 2nd stage auxiliary tanks are each connected to the wastewater tank, and the 3rd, 4th, and 5th stage auxiliary tanks are each connected to the first mixing tank. The 1st and 2nd stage auxiliary tanks are connected by an overflow connection, and the 3rd, 4th, and 5th stage auxiliary tanks are interconnected. The 3rd stage auxiliary tank and the 2nd stage auxiliary tank are connected by an overflow connection. Pure water supplied by the water supply unit flows from the 5th stage auxiliary tank to the 1st stage auxiliary tank.

[0033] The cleaning system also includes a cloud control system, which is electrically connected to the waste liquid recovery module, the reagent supply unit, the water supply unit, and the detection module, respectively, and is used to control the actions of the waste liquid recovery module, the reagent supply unit, the water supply unit, and the detection module. The cleaning system of this invention can perform full-process online monitoring of the operation of the waste liquid recovery module to ensure the quality of recovery and avoid product defects caused by problems with the recovered cleaning agent. Measurements show that over 90% of the water in the cleaning agent waste liquid collected using the cleaning system of this invention is recovered and reused, and over 50% of the active ingredients are retained, demonstrating high recovery efficiency.

[0034] It is understood that, in addition to cleaning products processed by CNC machining, the cleaning system described in this invention can also be used in other product processing stages for step-by-step cleaning. By classifying the cleaning fluid according to its degree of contamination, the cleaning fluid can be recycled and reused. When the cleaning system is used for spraying CNC-machined products, the cleaning tank is a spray tank.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above embodiments merely illustrate preferred implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A cleaning system characterized by: The cleaning system comprises n-stage cleaning tanks arranged in sequence and n-stage sub-tanks arranged on the n-stage cleaning tanks, the sub-tanks are communicated with the cleaning tanks, and products to be cleaned are transferred from the first-stage cleaning tank to the n-stage cleaning tank; the cleaning system further comprises a waste liquid recovery module; the waste liquid recovery module comprises a first mixing tank, a liquid storage tank and a membrane separator connected in sequence, and part of the sub-tanks arranged close to the n-stage cleaning tank are respectively connected to the first mixing tank to collect waste liquid into the first mixing tank to obtain mixed liquid, the liquid storage tank collects the mixed liquid delivered by the first mixing tank and then delivers the mixed liquid to the membrane separator, and the membrane separator is used for separating the mixed liquid to obtain recovered solvent and recovered active ingredient; the recovered solvent and the recovered active ingredient are returned to the cleaning tank for recycling.

2. The cleaning system of claim 1, wherein: The waste liquid recovery module further comprises a pretreatment unit arranged between the first mixing tank and the liquid storage tank; the pretreatment unit comprises at least one of a filter, a magnetic separator or a centrifugal clarifier, the filter is used for removing metal scraps and dust in the mixed liquid, the magnetic separator is used for removing ferromagnetic particles in the mixed liquid, and the centrifugal clarifier is used for removing micron-level suspended matter in the mixed liquid.

3. The cleaning system of claim 1, wherein: The membrane separator is a reverse osmosis membrane separator, a pressurizing pump is arranged between the liquid storage tank and the membrane separator, the pure water end of the reverse osmosis membrane separator produces the recovered solvent, and the concentrated component is produced at the concentrated water end of the reverse osmosis membrane separator.

4. The cleaning system of claim 3, wherein: The waste liquid recovery module further comprises a medicament regeneration unit arranged at the concentrated water end of the reverse osmosis membrane separator; the medicament regeneration unit comprises a medicament regeneration tank connected to the concentrated water end of the reverse osmosis membrane separator, a medicament detection assembly used for detecting the mixed liquid in the medicament regeneration tank, and a medicament supplementing tank used for supplementing medicament into the medicament regeneration tank based on the detection result of the medicament detection assembly.

5. The cleaning system of claim 3, wherein: The cleaning system further comprises a medicament supply unit and a water supply unit, the medicament supply unit is used for supplying cleaning agent to the cleaning tank, the water supply unit is used for supplying water to the n-stage cleaning tank and the medicament supply unit respectively, the water flow is from the n-stage cleaning tank to the first-stage cleaning tank, the pure water end of the reverse osmosis membrane separator is connected to the water supply unit to deliver the recovered solvent produced to the water supply unit.

6. The cleaning system of claim 5, wherein: The medicament supply unit comprises a medicament barrel, a medicament adding motor, a medicament tank and a second mixing tank connected in sequence, and the second mixing tank is connected to the water supply unit; the medicament in the medicament barrel is delivered into the medicament tank through the medicament adding motor, the medicament tank delivers the medicament into the second mixing tank, the water supply unit supplies water into the second mixing tank, and the medicament and the water are mixed in the second mixing tank to obtain the cleaning agent.

7. The cleaning system of claim 1, wherein: The cleaning system further comprises a sewage pool connected to the sub-tank not connected to the first mixing tank.

8. The cleaning system of claim 1, wherein: The sub-tanks connected to the first mixing tank are communicated in series, and the remaining sub-tanks are communicated in overflow.

9. The cleaning system of claim 6, wherein: The cleaning system further comprises a detection module; the detection module comprises conductivity sensors, concentration sensors, pH sensors and liquid level sensors, and the medicine tank and the cleaning tank are both provided with conductivity sensors, concentration sensors and pH sensors, and the medicine tank and the first-stage cleaning tank are both provided with liquid level sensors.

10. The cleaning system of claim 7, wherein: The cleaning system comprises five-stage cleaning tanks and five-stage auxiliary tanks, the third-stage auxiliary tank to the fifth-stage auxiliary tank are connected to the waste liquid recovery module, and the first-stage auxiliary tank and the second-stage auxiliary tank are connected to the sewage pool.

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