Proportioning station with release agent concentration negative feedback regulation function and proportioning method

Abstract

The invention provides a proportioning station with a release agent concentration negative feedback regulation function and a proportioning method, and relates to the technical field of release agent proportioning, the proportioning station comprises a container piece, a first pipeline, a second pipeline, a stirring assembly, a circulating system and a control system integrating control, storage and display. By reasonably designing the stirring assembly and the circulating system, a circularly flowing mixing system is formed, and the proportioning liquid in the container part can be efficiently and comprehensively mixed; operation is carried out according to a set sampling period T, and a concentration error is calculated based on a concentration set value and an actually measured concentration value detected by the concentration sensor; and according to the concentration error, the duty ratio of a first electromagnetic valve on the first pipeline and / or a second electromagnetic valve on the second pipeline in a sampling period T is adjusted to carry out real-time negative feedback concentration adjustment, so that the concentration of the proportioning liquid can be controlled in a high-precision, high-stability and quick-response manner.

Description

Technical Field

[0001] This invention relates to the field of mold release agent proportioning technology, specifically to a proportioning station and proportioning method with negative feedback adjustment function for mold release agent concentration. Background Technology

[0002] In cold chamber high-pressure aluminum alloy die casting production, mold release agents are required; the precise formulation and stable supply of mold release agents are key to ensuring casting quality, protecting molds, and improving production efficiency.

[0003] Currently, most mold release agent mixing stations used in the industry employ open-loop or semi-open-loop control methods, which have the following main drawbacks:

[0004] 1. Low concentration control accuracy and poor stability: Existing mixing stations mainly mix water and release agent concentrate by pre-setting the volume or flow ratio. This method cannot compensate for the actual concentration drift caused by fluctuations in water pressure, changes in concentrate viscosity, pump and valve performance degradation, and changes in pipeline pressure loss, resulting in unstable release agent concentration sprayed onto the mold.

[0005] 2. Reliance on manual labor and delayed response: Concentration detection requires operators to periodically use tools such as refractometers to take offline samples and measure. This post-detection method cannot reflect concentration changes in real time. By the time the concentration exceeds the standard, a large number of defective castings have already been produced, resulting in waste.

[0006] 3. Inability to achieve refined management and traceability: The lack of continuous concentration data records makes it impossible to trace the process parameters at the time when quality problems occur, which is not conducive to process optimization and quality analysis.

[0007] 4. Potential waste: To ensure minimum process requirements, a high safety concentration is usually set, leading to excessive use of release agent.

[0008] Therefore, there is an urgent need for an intelligent mixing device that can monitor in real time and automatically maintain a constant concentration of release agent to solve the above problems. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a mixing station and mixing method with negative feedback adjustment function for release agent concentration, which solves the problems that open-loop or semi-open-loop mixing stations cannot efficiently and accurately control the concentration and lack continuous concentration data recording.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A mixing station with negative feedback adjustment function for mold release agent concentration includes:

[0012] The container has a first region and a second region that are interconnected inside. The first region is provided with a first pipeline for injecting a release agent and a second pipeline for injecting a diluent. The second region is provided with a stirring assembly.

[0013] A circulation system, which is an external circulation pipeline, is used to transport the prepared solution in the first area to the second area, and a concentration sensor is installed on the pipeline of the circulation system.

[0014] The controller is configured to operate according to a set sampling period T, calculate the concentration error based on the concentration setpoint and the measured concentration value detected by the concentration sensor, and adjust the duty cycle of the first solenoid valve on the first pipeline and / or the second solenoid valve on the second pipeline within one sampling period T according to the concentration error.

[0015] The storage unit is used to store the historical concentration data queue detected by the concentration sensor and the historical concentration error data queue calculated by the controller.

[0016] Preferably, it further includes: a frame, the frame including a movable base and a main frame fixed to the top of the movable base;

[0017] The container and the circulation system are both mounted on the mobile base, and the first pipeline and the second pipeline are both arranged on the main frame;

[0018] The first solenoid valve, the second solenoid valve, the controller, and the storage unit are all located on the top of the main frame. A protective cover is fixedly installed on the side of the main frame to cover the first solenoid valve, the second solenoid valve, the controller, and the storage unit.

[0019] Preferably, the stirring assembly includes: a stirring shaft, stirring blades, and a driving component;

[0020] The drive unit is fixedly installed on the top of the container, the stirring shaft passes through the container, the top end of the stirring shaft is connected to the output end of the drive unit, and the stirring blade is fixedly installed on the bottom end of the stirring shaft.

[0021] Preferably, a liquid level sensor is also provided inside the container;

[0022] The controller is also configured to calculate the replenishment requirement based on the liquid level setpoint and the actual liquid level value detected by the liquid level sensor.

[0023] The controller adjusts the duty cycle of the first solenoid valve and / or the second solenoid valve within a sampling period T based on the concentration error and replenishment requirements.

[0024] Preferably, the container is further provided with a liquid supply module.

[0025] Preferably, the circulation system includes an inlet pipe, an outlet pipe, and a circulation pump;

[0026] One end of the inlet pipe is connected to the portion of the container near the first area, and the other end is connected to the inlet of the circulation pump.

[0027] One end of the outlet pipe is connected to the portion of the container near the second region, and the other end is connected to the outlet of the circulation pump.

[0028] The concentration sensor is installed on the outlet pipe.

[0029] Preferably, the concentration sensor is a conductivity sensor.

[0030] A mixing method using a mixing station with negative feedback adjustment function for mold release agent concentration, specifically including the following steps:

[0031] S1. Obtain the measured concentration value of the prepared solution at the end of the previous sampling period T. The concentration setpoint within the current sampling period T , Container volume of liquid and the duty cycle of the second solenoid valve on the second pipeline during the sampling period T. And calculate the duty cycle of the first solenoid valve on the first pipeline in the current sampling period T. ;

[0032] S2. Control the second solenoid valve on the second pipeline to operate within a predetermined duty cycle during the sampling period T. The first solenoid valve on the first pipeline is opened and operates according to the calculated duty cycle within the sampling period T. Start.

[0033] Preferably, preparing a solution with a predetermined concentration and volume inside a container includes the following steps:

[0034] A1. Obtain the set concentration value of the mixing solution. Volume setting value ;

[0035] A2. Based on the volume setting value Calculate the volume of the pre-open-loop ratio Based on the pre-open-loop proportioning volume Concentration setpoint Calculate the injection volume of release agent and diluent;

[0036] A3. Based on the calculated release agent injection volume and diluent injection volume, inject the release agent and diluent into the container using an open-loop method;

[0037] A4. Periodically execute S1 and S2.

[0038] Preferably, the concentration setpoint within the current sampling period T. The temporary target value is selected as the measured concentration of the solution at the end of the previous sampling period T. Compared with the final concentration setpoint The values ​​between.

[0039] This invention provides a mixing station and mixing method with negative feedback adjustment function for mold release agent concentration. It has the following beneficial effects:

[0040] 1. This invention, through the rational design of the stirring components and circulation system, forms a circulating mixing system that can efficiently and comprehensively mix the proportioned liquid inside the container. Furthermore, by operating according to a set sampling period T, it calculates the concentration error based on the set concentration value and the measured concentration value detected by the concentration sensor, and adjusts the duty cycle of the first solenoid valve on the first pipeline and / or the second solenoid valve on the second pipeline within one sampling period T to achieve real-time negative feedback adjustment of the concentration. This enables high-precision, high-stability, and rapid-response control of the proportioned liquid concentration. A storage unit is also designed to store the historical concentration data queue detected by the concentration sensor and the historical concentration error data queue calculated by the controller. In the event of quality problems, the process parameters at that time can be traced, which is beneficial for process optimization and quality analysis.

[0041] 2. This invention operates according to a set sampling period T, calculates the concentration error based on the set concentration value and the measured concentration value detected by the concentration sensor, and adjusts the duty cycle of the first solenoid valve on the first pipeline and / or the second solenoid valve on the second pipeline within one sampling period T to achieve real-time negative feedback adjustment of the concentration. This achieves high-precision adjustment of the concentration of the mixing solution. In actual operation, the concentration of the mixing solution can be set more accurately, avoiding material waste and saving the use of release agent. Attached Figure Description

[0042] Figure 1 This is a three-dimensional view of a mixing station with negative feedback adjustment function for release agent concentration proposed in this invention;

[0043] Figure 2 This is a front view of a mixing station with negative feedback adjustment function for mold release agent concentration proposed in this invention;

[0044] Figure 3This is a side view of a mixing station with negative feedback adjustment function for release agent concentration proposed in this invention;

[0045] Figure 4 This is a three-dimensional schematic diagram of a mixing station with negative feedback adjustment function for release agent concentration proposed in this invention;

[0046] Figure 5 This is a schematic diagram of the principle of a mixing station with negative feedback adjustment function for release agent concentration proposed in this invention.

[0047] The components include: 1. Frame; 101. Main frame; 102. Movable base; 103. Protective cover; 2. Container; 3. Circulation system; 301. Inlet pipe; 302. Outlet pipe; 303. Circulation pump; 4. Stirring assembly; 401. Stirring shaft; 402. Stirring blade; 403. Drive component; 5. Liquid supply module; 6. First pipe; 6a. First solenoid valve; 7. Second pipe; 7a. Second solenoid valve; 8. Liquid level sensor; 9. Concentration sensor; a. First area; b. Second area. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Example 1:

[0050] like Figures 1-5 As shown, this embodiment of the invention provides a mixing station with negative feedback adjustment function for mold release agent concentration, used to continuously provide a mixing liquid with stable concentration in the die casting island spraying system. Specifically, it includes: container 2, first pipeline 6, second pipeline 7, stirring assembly 4, circulation system 3, and control system integrating control, storage, and display.

[0051] The container 2 adopts an open or closed shell, and provides a cavity inside for temporarily storing the diluent. The container 2 has a first region a and a second region b that are interconnected. It can be understood that the inside of the container 2 is a whole region, and the first region a and the second region b are components of this whole region. The first region a is provided with a first pipe 6 for injecting the release agent and a second pipe 7 for injecting the diluent.

[0052] It is understandable that the first pipe 6 supplies the mold release agent to the container 2, and the second pipe 7 supplies the diluent to the container 2. The mold release agent and the diluent are injected into the container 2 in a certain proportion and mixed to form a mixture. For example, the mold release agent supplied by the first pipe 6 is a high-concentration mold release agent solution, and the diluent supplied by the second pipe 7 is a low-concentration mold release agent solution or water.

[0053] A stirring assembly 4 is installed in the second zone b, and the circulation system 3 adopts an external circulation pipeline to transport the prepared liquid in the first zone a to the second zone b.

[0054] Understandably, the stirring component 4 is located in the second region b, and when it is working, it can efficiently and quickly mix the liquid in the second region b. The circulation system 3 continuously transports the liquid in the first region a to the second region b. Inside the container 2, the liquid in the second region b flows to the first region a, forming a circulating system. This enables efficient and comprehensive mixing of the liquid inside the container 2. In specific implementation, adding a release agent and diluent with a proportion of less than 5% of the total liquid in the first region a can complete basic mixing within 3-6 seconds.

[0055] A concentration sensor 9 is installed on the pipeline of the circulation system 3, which is used to detect the concentration of the mixed liquid passing through the circulation system 3; for example, the concentration sensor 9 is a conductivity sensor. The advantage of the conductivity sensor is that it can acquire concentration data in real time. It can measure the concentration of the mixed liquid flowing in the pipeline of the circulation system 3 and obtain relevant concentration data.

[0056] The control system is electrically connected to the concentration sensor 9, the first solenoid valve 6a on the first pipeline 6, and the second solenoid valve 7a on the second pipeline 7. The control system includes a controller and a storage unit. The controller is configured to operate according to a set sampling period T. Based on the set concentration value, the measured concentration value detected by the concentration sensor 9, and related calculated data values ​​(such as the concentration data of the release agent, the volume data of the mixed liquid in the container 2, the concentration data of the diluent, etc.), the controller adjusts the duty cycle of the first solenoid valve 6a on the first pipeline 6 and / or the second solenoid valve 7a on the second pipeline 7 within one sampling period T.

[0057] In one scenario, the first solenoid valve 6a on the first pipeline 6 and the second solenoid valve 7a on the second pipeline 7 are both controlled to prepare the mixing solution according to the corresponding calculated duty cycle. The mixing solution then enters the container 2 for mixing, thereby achieving the purpose of replenishing the mixing solution in the container 2 and adjusting the concentration of the mixing solution in the container 2.

[0058] In one scenario, the first solenoid valve 6a on the first pipeline 6 is controlled to operate at a set duty cycle, while the second solenoid valve 7a on the second pipeline 7 operates at a corresponding calculated duty cycle to prepare the mixing solution. This mixing solution then enters the container 2 for mixing, thereby replenishing the mixing solution in the container 2 and adjusting the concentration of the mixing solution in the container 2.

[0059] In one scenario, the second solenoid valve 7a on the second pipeline 7 is controlled to operate at a set duty cycle, while the first solenoid valve 6a on the first pipeline 6 operates at a corresponding calculated duty cycle to prepare the mixing solution. This mixing solution then enters the container 2 for mixing, thereby replenishing the mixing solution in the container 2 and adjusting the concentration of the mixing solution in the container 2.

[0060] The storage unit is used to store the historical concentration data queue detected by the concentration sensor 9 and the historical concentration error data queue calculated by the controller. This data is saved for traceability in case of subsequent quality problems.

[0061] In one embodiment, a frame 1 is also designed, which includes a movable base 102 and a main frame 101 fixed to the top of the movable base 102. The movable base 102 provides a movable load-bearing structure, and the main frame 101 is fixedly installed on the movable base 102 to facilitate the installation of various components.

[0062] For example, both container 2 and circulation system 3 are mounted on the movable base 102. Container 2 and circulation system 3 are relatively heavy and are directly supported by the movable base 102. Their pipelines can be reasonably distributed on the main frame 101. For example, the first pipeline 6 and the second pipeline 7 are both arranged on the main frame 101. The first solenoid valve 6a, the second solenoid valve 7a, the controller and the storage unit are all located at the top of the main frame 101. A protective cover 103 is fixedly installed on the side of the main frame 101 to cover the first solenoid valve 6a, the second solenoid valve 7a, the controller and the storage unit. The protective cover 103 has a protective function for the first solenoid valve 6a, the second solenoid valve 7a, the controller and the storage unit.

[0063] In one embodiment, the stirring assembly 4 includes: a stirring shaft 401, a stirring blade 402, and a driving member 403; the driving member 403 is fixedly installed on the top of the container 2, the stirring shaft 401 passes through the container 2, the stirring shaft 401 can be rotatably connected to the top surface of the container 2 or the stirring shaft 401 passes through a preset hole on the container 2, the top end of the stirring shaft 401 is connected to the output end of the driving member 403, and the stirring blade 402 is fixedly installed on the bottom end of the stirring shaft 401.

[0064] It is understandable that the driving component 403 drives the stirring shaft 401 to rotate, and the stirring shaft 401 drives the stirring blade 402 to rotate inside the container 2; thus, the proportioned liquid inside the container 2 is stirred and mixed.

[0065] In one embodiment, a liquid level sensor 8 is also provided inside the container 2. The liquid level sensor 8 is used to detect the real-time liquid level value inside the container 2 and transmit the real-time liquid level value to the controller.

[0066] The controller is also configured to calculate the replenishment requirement based on the liquid level setpoint and the actual liquid level detected by the liquid level sensor 8; the controller adjusts the duty cycle of the first solenoid valve 6a and / or the second solenoid valve 7a within a sampling period T according to the concentration error and the replenishment requirement.

[0067] Understandably, the controller controls the first pipeline 6 to supply the release agent and the second pipeline 7 to supply the diluent. The release agent and the diluent are mixed to form a supplementary solution in the container 2. This supplementary solution is used to adjust the concentration of the original solution inside the container 2. The amount of the original solution inside the container 2 is obtained based on the level sensor 8 (inside the container 2, the level and the amount of solution are in a one-to-one correspondence), thereby enabling better adjustment (correction) of the concentration of the solution.

[0068] In one embodiment, the container 2 is also provided with a liquid supply module 5.

[0069] The liquid supply module 5 is used to pump the solution inside the container 2 to the usage location. Specifically, it includes a delivery pump body, output pipeline, pressure sensor, check valve, flow sensor, etc.

[0070] In one embodiment, the circulation system 3 includes an inlet pipe 301, an outlet pipe 302, and a circulation pump 303.

[0071] One end of the inlet pipe 301 is connected to the portion of the container 2 near the first region a, and the other end is connected to the inlet of the circulation pump 303; one end of the outlet pipe 302 is connected to the portion of the container 2 near the second region b, and the other end is connected to the outlet of the circulation pump 303; the concentration sensor 9 is installed on the outlet pipe 302.

[0072] like Figure 1 , Figure 5 As shown, the circulation pump 303 operates, drawing liquid from the container 2 through the inlet pipe 301, through the inner cavity of the circulation pump 303, through the outlet pipe 302, and then back into the container 2.

[0073] Example 2:

[0074] This invention provides a mixing method using a mixing station with negative feedback adjustment function for mold release agent concentration, used to continuously provide a stable concentration of mixing liquid in a die-casting island spraying system. The mixing station with negative feedback adjustment function for mold release agent concentration described in Example 1 specifically includes the following steps:

[0075] S1. Obtain the measured concentration value of the prepared solution at the end of the previous sampling period T. The concentration setpoint within the current sampling period T Container 2 contains the correct volume of liquid. and the duty cycle of the second solenoid valve 7a on the second pipeline 7 during the sampling period T. And calculate the duty cycle of the first solenoid valve 6a on the first pipeline 6 in the current sampling period T. .

[0076] It is understandable that the measured concentration value of the prepared solution is obtained at the end of the previous sampling period T. If there is no previous cycle T (corresponding to the initial cycle), then only one cycle of the cyclic system 3 is executed. In this way, the concentration sensor 9 can obtain the measured concentration value of the solution at the end of the previous sampling cycle T. The duty cycle of the second solenoid valve 7a on the second pipeline 7 during the sampling period T. This is the set value.

[0077] The specific implementation method is as follows:

[0078] Calculate the volume of diluent supplied by the second pipeline 7 during the current cycle. ;

[0079]

[0080] In the above formula, This indicates the volume of diluent that flows through the second solenoid valve 7a on the second pipeline 7 for one cycle time T. This indicates the duty cycle of the second solenoid valve 7a on the second pipeline 7 during the sampling period T; T represents the period time.

[0081] Calculate the duty cycle of the first solenoid valve 6a on the first pipeline 6 in the current sampling period T. ;

[0082]

[0083]

[0084] In the above formula, This indicates the volume of diluent supplied by the first pipeline 6 during the current cycle. This indicates the volume of diluent that flows through the first solenoid valve 6a on the first pipeline 6 for one cycle T. This indicates the duty cycle of the first solenoid valve 6a on the first pipeline 6 during the sampling period T; T represents the period time. Indicates the volume of the prepared liquid inside container 2; This indicates the concentration of the diluent supplied by the first pipeline 6; This represents the concentration setpoint within the current sampling period T; This indicates the measured concentration of the solution at the end of the previous sampling period T.

[0085] The duty cycle is calculated based on the above formula. It is worth noting that a cycle T of 5-10 seconds is selected, which enables rapid mixing within the rapid stirring system consisting of container 2 and circulation system 3. It is understood that the purpose of operating this system is to achieve the measured concentration value of the prepared solution. Concentration setpoint within the current sampling period T While the actual values ​​are consistent, they cannot be completely identical due to system fluctuations and actual errors. In such cases, the concentration setpoint can be used. The threshold range with a fixed width, serving as an intermediate value, is used to determine whether to proceed with the next cycle; in addition to concentration data, the measured volume of the prepared liquid in container 2 is also considered. When the volume of the liquid in container 2 is... When the volume of the liquid is less than the set threshold, the next cycle can be started to achieve the purpose of replenishing water.

[0086] S2. Control the second solenoid valve 7a on the second pipeline 7 to operate within the sampling period T according to a predetermined duty cycle. The first solenoid valve 6a on the first pipeline 6 is opened and operates according to the calculated duty cycle within the sampling period T. Turn on, thus enabling the adjustment of the concentration setting inside container 2.

[0087] It is worth noting that this method converts the theoretical control quantity calculated by the continuous PID algorithm into a precise pulse time signal (PWM signal) to drive the solenoid valve.

[0088] In one embodiment, a solution of a predetermined concentration and volume (corresponding to empty tank startup) is prepared inside container 2, which includes the following steps:

[0089] A1. Obtain the set concentration value of the mixing solution. Volume setting value .

[0090] A2. Based on the volume setting value Calculate the volume of the pre-open-loop ratio Based on the pre-open-loop proportioning volume Concentration setpoint Calculate the injection volume of release agent and diluent.

[0091] Based on volume setting value Calculate the volume of the pre-open-loop ratio Optional, volume setting value Multiply by 80% to obtain the volume of the pre-open-loop formulation. .

[0092] A3. Based on the calculated release agent injection amount and diluent injection amount, inject the release agent and diluent into the container 2 in an open-loop manner.

[0093] The open-loop mode injects release agent and diluent into the container 2, which is different from the traditional method of injecting directly according to the calculated value. It does not require real-time monitoring and feedback, thus enabling efficient mixing.

[0094] A4. Periodically execute S1 and S2. It is understandable that the above A1-A3 processes are traditional methods of directly injecting based on calculated values, which may result in concentration deviations. The purpose of periodically executing S1 and S2 is mainly twofold: first, to compensate for the concentration data, and second, to replenish the prepared solution.

[0095] In one embodiment, to accommodate the possibility of users actively adjusting the concentration setpoint... The concentration range of the solution in container 2 is too large, making adjustment impossible within a single week and potentially causing system malfunctions. Therefore, it is necessary to allow users to manually adjust the concentration setpoint. Setting is required; one feasible method is to set the concentration value within the sampling period T. The temporary target value is selected as the measured concentration of the solution at the end of the previous sampling period T. Compared with the final concentration setpoint The values ​​between.

[0096] For example, a straight line with a slope of r (the relationship between time and concentration) is defined, and the measured concentration of the solution at the end of the previous sampling period T is calculated. Compared with the final concentration setpoint The time interval is reasonably divided into several cycles, and the measured concentration value of the solution at the end of the previous sampling cycle T is used as the reference. Compared with the final concentration setpoint Select a corresponding number of temporary tracking target values; during periodic operation, use the temporary tracking target values ​​as the concentration setpoint for the next sampling period T. .

[0097] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mixing station with negative feedback adjustment function for mold release agent concentration, characterized in that, include: The container (2) has a first region (a) and a second region (b) that are interconnected inside. The first region (a) is provided with a first pipe (6) for injecting a release agent and a second pipe (7) for injecting a diluent. The second region (b) is provided with a stirring assembly (4). The circulation system (3) is an external circulation pipeline used to transport the proportioned liquid in the first area (a) to the second area (b), and a concentration sensor (9) is installed on the pipeline of the circulation system (3). The controller is configured to operate according to a set sampling period T, calculate the concentration error based on the concentration set value and the measured concentration value detected by the concentration sensor (9), and adjust the duty cycle of the first solenoid valve (6a) on the first pipeline (6) and / or the second solenoid valve (7a) on the second pipeline (7) within a sampling period T according to the concentration error; The storage unit is used to store the historical concentration data queue detected by the concentration sensor (9) and the historical concentration error data queue calculated by the controller.

2. The mixing station with negative feedback adjustment function for release agent concentration according to claim 1, characterized in that, Also includes: The frame (1) includes a movable base (102) and a main frame (101) fixed to the top of the movable base (102). The container (2) and the circulation system (3) are both mounted on the mobile base (102), and the first pipeline (6) and the second pipeline (7) are both arranged on the main frame (101); The first solenoid valve (6a), the second solenoid valve (7a), the controller and the storage unit are all located on the top of the main frame (101), and a protective cover (103) is fixedly installed on the side of the main frame (101) to cover the first solenoid valve (6a), the second solenoid valve (7a), the controller and the storage unit.

3. A mixing station with negative feedback adjustment function for release agent concentration according to claim 1, characterized in that, The stirring assembly (4) includes: a stirring shaft (401), stirring blades (402), and a driving component (403). The drive unit (403) is fixedly installed on the top of the container (2), the stirring shaft (401) passes through the container (2), the top end of the stirring shaft (401) is connected to the output end of the drive unit (403), and the stirring blade (402) is fixedly installed at the bottom end of the stirring shaft (401).

4. A mixing station with negative feedback adjustment function for release agent concentration according to claim 1, characterized in that: The container (2) is also equipped with a liquid level sensor (8); The controller is also configured to calculate the replenishment requirement based on the liquid level setpoint and the actual liquid level detected by the liquid level sensor (8); The controller adjusts the duty cycle of the first solenoid valve (6a) and / or the second solenoid valve (7a) within a sampling period T based on the concentration error and replenishment requirements.

5. A mixing station with negative feedback adjustment function for release agent concentration according to claim 1, characterized in that: The container (2) is also provided with a liquid supply module (5).

6. A mixing station with negative feedback adjustment function for release agent concentration according to claim 1, characterized in that: The circulation system (3) includes an inlet pipe (301), an outlet pipe (302), and a circulation pump (303); One end of the inlet pipe (301) is connected to the portion of the container (2) near the first region (a), and the other end is connected to the inlet of the circulating pump (303); One end of the outlet pipe (302) is connected to the portion of the container (2) near the second region (b), and the other end is connected to the outlet of the circulating pump (303); The concentration sensor (9) is installed on the outlet pipe (302).

7. A mixing station with negative feedback adjustment function for release agent concentration according to claim 6, characterized in that: The concentration sensor (9) is a conductivity sensor.

8. A mixing method using a mixing station with negative feedback adjustment function for mold release agent concentration, characterized in that, The mixing station with negative feedback adjustment function for mold release agent concentration as described in any one of claims 1-7 specifically includes the following steps: S1. Obtain the measured concentration value of the prepared solution at the end of the previous sampling period T. The concentration setpoint within the current sampling period T 1. Container (2) Internal liquid volume ratio and the duty cycle of the second solenoid valve (7a) on the second pipeline (7) during the sampling period T. And calculate the duty cycle of the first solenoid valve (6a) on the first pipeline (6) in the current sampling period T. ; S2. Control the second solenoid valve (7a) on the second pipeline (7) to operate within the sampling period T according to a predetermined duty cycle. The first solenoid valve (6a) on the first pipeline (6) is opened and operates according to the calculated duty cycle within the sampling period T. Start.

9. The proportioning method of a proportioning station with negative feedback adjustment function for release agent concentration according to claim 8, characterized in that, Also includes: The preparation of a solution with a set concentration and volume inside the container (2) includes the following steps: A1. Obtain the set concentration value of the mixing solution. Volume setting value ; A2. Based on the volume setting value Calculate the volume of the pre-open-loop ratio Based on the pre-open-loop proportioning volume Concentration setpoint Calculate the injection volume of release agent and diluent; A3. Based on the calculated release agent injection amount and diluent injection amount, inject the release agent and diluent into the container (2) in an open-loop mode; A4. Periodically execute S1 and S2.

10. The proportioning method of a proportioning station with negative feedback adjustment function for release agent concentration according to claim 8, characterized in that: Concentration setpoint within the current sampling period T The temporary target value is selected as the measured concentration of the solution at the end of the previous sampling period T. Compared with the final concentration setpoint The values ​​between.

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