Automatic adjusting system and method for material liquid ratio, liquid level and temperature of drag chain leaching device

Abstract

The present application relates to a kind of drag chain leaching liquor ratio, liquid level, temperature automatic regulating system and method, system includes drag chain leaching device shell, head has material feed inlet and extraction liquid discharge port, tail has material discharge port and extraction solvent liquid inlet port.Material feed inlet has feeding auger, feeding metering scale, feeding scraper, sequentially head-to-tail connection;Material discharge port has weight sensor;Extraction liquid discharge port and extraction solvent liquid inlet port respectively have extraction liquid discharge regulating valve, extraction liquid discharge flow meter and extraction solvent liquid inlet regulating valve, extraction solvent liquid inlet flow meter;Shell inner bottom has pressure type liquid level meter;Shell side wall has three temperature sensors, corresponding shell interior lower three segments circuitous steam heat exchange pipeline, steam heat exchange pipeline steam inlet all have steam inlet regulating valve;In addition, automatic regulating method is further provided.The present application realizes drag chain leaching liquor ratio, liquid level, temperature automatic regulating, thereby stabilizes production efficiency and the yield of extraction product.

Description

TECHNICAL FIELD

[0001] The patent application belongs to the technical field of biological extraction, and more particularly relates to a drag chain extractor material-liquid ratio, liquid level and temperature automatic adjusting system and method. BACKGROUND

[0002] Extraction, also known as extraction, is a method of transferring solute substances from one solvent to another by taking advantage of the different solubilities of substances in two mutually insoluble (or slightly soluble) solvents. Extraction, as an extremely important link in the continuous industrial production of plant extracts, often occurs in a drag chain extractor.

[0003] In industrial production, the material and the extraction solvent are often put into the drag chain extractor according to the specified proportion of the extraction process, that is, the material is put into one end and the extraction solvent is injected from the other end. They are fully mixed and dissolved in the opposite flow, while the target components in the material are gradually transferred to the extraction solvent, achieving the extraction of the target substance. Generally, in industrial production, when extraction is carried out in a drag chain extractor, the material-liquid ratio, extraction solvent level and extraction solvent temperature need to be precisely controlled, that is, the proportion of the material and the extraction solvent needs to be precisely controlled, the extraction solvent level needs to be higher than the material and needs to be stable within the process index range, and the extraction solvent temperature in the extractor needs to be stable within the process index range.

[0004] At present, in the continuous industrial production of plant extracts, the material-liquid input ratio, the extraction solvent level and the extraction solvent temperature still need to be manually adjusted by experience and visual judgment. Not only is the operation intensity large, the degree of automation is low, the work efficiency is low, the responsibility of the workers is stronger, but also the misoperation is easy to occur, and it seriously affects the production efficiency of extraction and reduces the yield of the extracted product. Therefore, improvement and innovation of the drag chain extractor are imperative. SUMMARY

[0005] In order to overcome the problems of large operation intensity, low degree of automation, low work efficiency and influence on the production efficiency of extraction in the existing production link of the drag chain extractor, the technical problem to be solved by the present application is to provide a drag chain extractor material-liquid ratio, liquid level and temperature automatic adjusting system and method, which can realize continuous and precise control of the material-liquid input ratio and continuous and stable control of the extraction solvent level and the extraction solvent temperature in the drag chain extractor.

[0006] In order to solve the above problems, the technical scheme adopted by the present application is:

[0007] The application discloses an automatic adjusting system for material liquid ratio, liquid level and temperature of a drag chain leaching device, which comprises a drag chain leaching device shell, a control mechanism, a liquid inlet mechanism, a material inlet mechanism, a material outlet mechanism and an extraction liquid discharge mechanism arranged on the drag chain leaching device shell.

[0008] Further, the liquid inlet mechanism comprises an extraction solvent liquid inlet arranged at one end of the drag chain leaching device shell, a pipeline connected with the extraction solvent liquid inlet, an extraction solvent liquid inlet flow meter and an extraction solvent liquid inlet adjusting valve arranged on the pipeline in sequence, and a pressure type liquid level meter arranged at the bottom of the drag chain leaching device shell.

[0009] The material inlet mechanism comprises a material inlet arranged at the other end of the drag chain leaching device shell, and a feeding auger, a feeding metering scale and a feeding scraper arranged at the material inlet in sequence.

[0010] The material outlet mechanism comprises a material cavity arranged in the drag chain leaching device shell, a chain wheel mechanism arranged in the material cavity, a plurality of scrapers arranged on the chain wheel mechanism, a separation liquid permeation plate arranged in the material cavity and located below the chain wheel mechanism and the scrapers, a material outlet arranged at the outlet of the material cavity, and a weight sensor arranged at the material outlet and used for detecting whether the extraction material passes through the material outlet.

[0011] The extraction liquid discharge mechanism comprises an extraction liquid discharge port arranged on the drag chain leaching device shell, an extraction solvent circulating pump arranged in the drag chain leaching device shell and connected with the extraction liquid discharge port, and an extraction liquid discharge adjusting valve and an extraction liquid discharge flow meter arranged at the extraction liquid discharge port in sequence through a pipeline.

[0012] The control mechanism comprises a controller connected with the weight sensor and arranged at the other end of the lateral wall outside the drag chain leaching device shell, and the controller is further connected with the feeding scraper, the feeding auger, the feeding metering scale, the pressure type liquid level meter, the extraction solvent liquid inlet adjusting valve, the extraction solvent liquid inlet flow meter, the extraction solvent circulating pump, the extraction liquid discharge adjusting valve, the extraction liquid discharge flow meter, the chain wheel mechanism and the scrapers.

[0013] Further, the temperature adjusting mechanism connected with the controller comprises a temperature sensor arranged on the lateral wall in the drag chain leaching device shell, and the height of the temperature sensor is located below the separation liquid permeation plate.

[0014] Further, the temperature sensors are three, namely temperature sensor one, temperature sensor two and temperature sensor three; the steam heat exchange pipes are three, namely steam heat exchange pipe one, steam heat exchange pipe two and steam heat exchange pipe three; the steam heat exchange pipe one, the steam heat exchange pipe two and the steam heat exchange pipe three are provided with steam inlet regulating valve one, steam inlet regulating valve two and steam inlet regulating valve three respectively; the temperature sensor one, the temperature sensor two, the temperature sensor three, the steam inlet regulating valve one, the steam inlet regulating valve two and the steam inlet regulating valve three are connected with the controller.

[0015] Further, the temperature sensor one, the temperature sensor two and the temperature sensor three are installed on the front section, the middle section and the rear section of the side of the drag chain leaching device shell respectively.

[0016] Further, the drag chain leaching device shell comprises a horizontal section shell and an upper inclined section shell connected with each other (i.e. the tail of the horizontal section shell is connected with the head of the upper inclined section shell); the lower end of the head of the horizontal section shell is provided with an extraction liquid discharge port, and the upper end of the head is provided with a material feeding port; the bottom end of the head of the upper inclined section shell is provided with an extraction solvent inlet, and the tail is provided with a material discharge port; the extraction solvent circulating pump is located at the bottom end of the head in the horizontal section shell, and the pressure type liquid level meter is located at the bottom of the horizontal section shell.

[0017] Further, an explosion-proof control box is further provided, which is located beside the controller; the controller is a PLC controller.

[0018] A drag chain leaching device material liquid ratio, liquid level and temperature automatic adjusting method utilizes the above system, and the specific process is as follows.

[0019] S1, when the drag chain leaching device starts to work, the extraction solvent inlet regulating valve is fully opened; when the extraction solvent liquid level in the drag chain leaching device reaches the preset process height, the feeding scraper, the feeding metering scale, the feeding auger, the sprocket mechanism and the scraper automatically start to work, and the material is fed to the separation liquid permeation plate; the extraction solvent inlet regulating valve is automatically closed.

[0020] S2, after the material is fed to the separation liquid permeation plate, the material is gradually moved to the material discharge port by the sprocket mechanism and the scraper; when the material is discharged from the material discharge port, the weight sensor is triggered.

[0021] S3, when the weight sensor detects that the material starts to be discharged from the material discharge port, the controller automatically adjusts the opening degree of the extraction solvent inlet regulating valve according to the instantaneous feeding amount of the material measured by the feeding metering scale at the material feeding port, and adjusts the instantaneous extraction solvent inlet amount to the calculated value according to the process index requirement ratio; wherein, the weight sensor functions to detect whether the extraction material has started to be discharged from the material discharge port.

[0022] S4, the controller detects the extraction solvent level in the drag chain leaching device in real time according to the pressure type liquid level meter at the bottom of the drag chain leaching device, the controller automatically adjusts the opening degree of the extraction liquid discharge adjusting valve through a control algorithm, and the extraction solvent level in the drag chain leaching device is stabilized to the process index liquid level value range through the control of the instantaneous extraction liquid discharge amount.

[0023] S5, when the weight sensor detects that the material is completely discharged from the material discharge port, the extraction solvent inlet adjusting valve, the chain wheel mechanism and the scraper are automatically closed, and when the pressure type liquid level meter detects that the extraction solvent level in the drag chain leaching device decreases to the preset liquid level value, the extraction liquid discharge adjusting valve and the extraction solvent circulating pump are automatically closed, wherein the weight sensor functions to detect whether the extraction material has been completely discharged from the material discharge port.

[0024] Further, in S3, “the opening degree of the extraction solvent inlet adjusting valve is automatically adjusted according to the process index requirement proportion, and the instantaneous extraction solvent inlet amount is adjusted to the calculated value” specifically means:

[0025] According to the process index requirement proportion, the expected extraction solvent inlet flow is calculated, the instantaneous error between the expected value and the actual value of the extraction solvent inlet flow is taken as control parameter one, the error integral accumulation amount between the expected value and the actual value of the extraction solvent inlet flow is taken as control parameter two, and the error change rate between the expected value and the actual value of the extraction solvent inlet flow is taken as control parameter three, the control output value is obtained based on the proportional, integral and differential control algorithm of control parameters one, two and three, the opening degree of the extraction solvent inlet adjusting valve is determined by the control output value, and the instantaneous extraction solvent inlet amount is adjusted to half of the calculated value.

[0026] In S4, “the controller automatically adjusts the opening degree of the extraction liquid discharge adjusting valve through a control algorithm, and the extraction solvent level in the drag chain leaching device is stabilized to the process index liquid level value range through the control of the instantaneous extraction liquid discharge amount”, specifically means

[0027] The instantaneous error between the preset value and the actual value of the extraction solvent level in the drag chain leaching device is taken as control parameter four, the error integral accumulation amount between the preset value and the actual value of the extraction solvent level is taken as control parameter five, and the error change rate between the preset value and the actual value of the extraction solvent level is taken as control parameter six, the control output value is obtained based on the proportional, integral and differential control algorithm of control parameters four, five and six, the opening degree of the extraction liquid discharge adjusting valve and the instantaneous extraction liquid discharge flow are determined by the control output value, and the extraction solvent circulating pump is opened at the same time, so that the extraction solvent level in the drag chain leaching device is stabilized to the process index liquid level value range, and then the controller adjusts the opening degree of the extraction solvent inlet adjusting valve according to the instantaneous feeding amount of the feeding metering scale, and adjusts the instantaneous extraction solvent inlet amount to the measured value.

[0028] Further, according to the real-time detected extraction solvent temperatures of the front section, the middle section and the rear section of the horizontal section shell by the temperature sensor one, the temperature sensor two and the temperature sensor three, the opening degrees of the steam inlet adjusting valve one, the steam inlet adjusting valve two and the steam inlet adjusting valve three at the corresponding positions below are automatically adjusted, and the extraction solvent temperature is stabilized at the preset process temperature by controlling the steam flow in the steam heat exchange pipeline one, the steam heat exchange pipeline two and the steam heat exchange pipeline three.

[0029] Due to the adoption of the above technical solutions, the present application has the following beneficial effects:

[0030] 1. The extraction solvent liquid inlet amount in the drag chain leaching device is accurately and automatically adjusted according to the material feeding amount according to the process ratio, so that the material and extraction solvent ratio is maintained within the process index range, the production efficiency is stabilized, and the utilization rate of the extraction solvent is improved.

[0031] 2. According to the real-time detected extraction solvent liquid level by the pressure type liquid level meter in the drag chain leaching device, the extraction liquid discharge amount is automatically adjusted by the proportional, integral and differential control algorithm, so that the extraction solvent liquid level in the leaching device is stabilized within the process index range, the appropriate liquid level helps to improve the extraction solvent spraying effect and extraction stability, and reduces the manual patrol time and operation intensity.

[0032] 3. The extraction solvent temperature in the drag chain leaching device is accurately adjusted to the process index range by automatically adjusting the steam inlet amount in the steam heat exchange pipeline, so that the extraction effect of the extraction solvent on the target solute is optimized.

[0033] 4. The present application has novel and unique structure, convenient operation and use, realizes the automatic adjustment of the material liquid ratio, the extraction solvent liquid level and the extraction solvent temperature in the leaching device, reduces the probability of misoperation, has high production efficiency and small labor intensity, has significant economic and social benefits, and is suitable for continuous industrial production. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is the overall structure front view of the present application;

[0035] Figure 2 is Figure 1 the partial structure top view of A part in the middle;

[0036] In the figure, 1, drag chain leaching vessel, 2, horizontal section vessel, 3, upper inclined section vessel, 4, feeding scraper, 5, feeding metering scale, 6, feeding auger, 7, weight sensor, 8, extraction solvent inlet regulating valve, 9, extraction solvent inlet flowmeter, 10, pressure type liquid level meter, 11, extraction solvent circulating pump, 12, extraction liquid discharge regulating valve, 13, extraction liquid discharge flowmeter, 14, separation and percolation plate, 15, sprocket mechanism and scraper, 16, controller, 17, temperature sensor one, 18, temperature sensor two, 19, temperature sensor three, 20, steam inlet regulating valve one, 21, steam inlet regulating valve two, 22, steam inlet regulating valve three, 23, steam heat exchange pipeline one, 24, steam heat exchange pipeline two, 25, steam heat exchange pipeline three, 26, material inlet, 27, extraction liquid discharge outlet, 28, material outlet, 29, extraction solvent inlet. DETAILED DESCRIPTION

[0037] The application will be further described in detail below with reference to the examples.

[0038] A drag chain leaching vessel material-liquid ratio, liquid level, temperature automatic regulating system, like Figure 1 、 Figure 2 , comprising a drag chain leaching vessel 1, and a control mechanism, a liquid inlet mechanism, a material inlet mechanism, a material outlet mechanism, an extraction liquid discharge mechanism arranged on the drag chain leaching vessel 1, wherein the liquid inlet mechanism, the material inlet mechanism, the material outlet mechanism, and the extraction liquid discharge mechanism are connected with the control mechanism.

[0039] The liquid inlet mechanism comprises an extraction solvent inlet 29 arranged at one end of the drag chain leaching vessel 1, a pipeline connected with the extraction solvent inlet 29, an extraction solvent inlet flowmeter 9 and an extraction solvent inlet regulating valve 8 arranged on the pipeline in sequence, and a pressure type liquid level meter 10 arranged at the bottom inside the drag chain leaching vessel 1.

[0040] The material inlet mechanism comprises a material inlet 26 arranged at the other end of the drag chain leaching vessel 1, wherein a feeding auger 6, a feeding metering scale 5, and a feeding scraper 4 are arranged at the material inlet 26 in sequence.

[0041] The material outlet mechanism comprises a material cavity arranged inside the drag chain leaching vessel 1, a sprocket mechanism arranged in the material cavity, a plurality of scrapers arranged on the sprocket mechanism, a separation and percolation plate 14 arranged in the material cavity and below the sprocket mechanism and the scrapers 15, a material outlet 28 arranged at the outlet of the material cavity, and a weight sensor 7 arranged at the material outlet 28, wherein the weight sensor 7 can detect whether the extraction material passes through the material outlet, the material inlet 26 corresponds to the material cavity, the weight sensor 7 is located at the tail of the separation and percolation plate 14, and the separation and percolation plate 14 is a multi-layer separation and percolation plate.

[0042] The extraction liquid discharge mechanism comprises an extraction liquid discharge port 27 arranged on the drag chain leaching device shell 1, an extraction solvent circulating pump 11 arranged in the drag chain leaching device shell 1 and connected with the extraction liquid discharge port 27, and an extraction liquid discharge adjusting valve 12 and an extraction liquid discharge flow meter 13 arranged in sequence at the extraction liquid discharge port 27 through pipelines.

[0043] The control mechanism comprises a controller 16 connected with the weight sensor 7 and arranged on the outer sidewall of the drag chain leaching device shell 1, and the controller 16 is further connected with the feeding scraper 4, the feeding auger 6, the feeding metering scale 5, the pressure type liquid level meter 10, the extraction solvent inlet adjusting valve 8, the extraction solvent inlet flow meter 9, the extraction solvent circulating pump 11, the extraction liquid discharge adjusting valve 12, the extraction liquid discharge flow meter 13, the chain wheel mechanism and the scraper 15.

[0044] The drag chain leaching device shell 1 comprises a horizontal section shell 2 and an upper inclined section shell 3 connected with each other, that is, the tail of the horizontal section shell 2 is connected with the head of the upper inclined section shell 3, the lower end of the head of the horizontal section shell 2 is provided with the extraction liquid discharge port 27, and the upper end of the head of the horizontal section shell 2 is provided with the material feeding port 26; the bottom end of the head of the upper inclined section shell 3 is provided with the extraction solvent inlet port 29, and the tail of the upper inclined section shell 3 is provided with the material discharging port 28; the extraction solvent circulating pump 11 is located at the bottom end of the head in the horizontal section shell 2, and the pressure type liquid level meter 10 is located at the bottom in the horizontal section shell 2.

[0045] Meanwhile, the temperature adjusting mechanism connected with the controller 16 is further included, the temperature adjusting mechanism comprises a temperature sensor arranged on the inner sidewall of the drag chain leaching device shell 1, and the height of the temperature sensor is located below the separation liquid permeation plate 14; a steam heat exchange pipeline is correspondingly arranged below the inside of the drag chain leaching device shell 1, and a steam inlet adjusting valve is arranged at the steam inlet of the steam heat exchange pipeline.

[0046] As a preferred, the temperature sensor is three, which are temperature sensor one 17, temperature sensor two 18 and temperature sensor three 19; the steam heat exchange pipeline is correspondingly three sections of the circuit type steam heat exchange pipeline, which are steam heat exchange pipeline one 23, steam heat exchange pipeline two 24 and steam heat exchange pipeline three 25; the steam inlet adjusting valve one 20, the steam inlet adjusting valve two 21 and the steam inlet adjusting valve three 22 are respectively arranged on the steam heat exchange pipeline one 23, the steam heat exchange pipeline two 24 and the steam heat exchange pipeline three 25; the temperature sensor one 17, the temperature sensor two 18, the temperature sensor three 19, the steam inlet adjusting valve one 20, the steam inlet adjusting valve two 21 and the steam inlet adjusting valve three 22 are all connected with the controller 16.

[0047] In the layout, the temperature sensor one 17, the temperature sensor two 18 and the temperature sensor three 19 are respectively installed in the front section, the middle section and the rear section of the side of the drag chain leaching device shell 1.

[0048] An explosion-proof control box is arranged beside the controller 16, and the controller 16 is a PLC controller.

[0049] By using the system, the application further provides an automatic adjusting method for the material-liquid ratio, liquid level and temperature of the drag chain leaching device.

[0050] S1, when the drag chain leaching device starts to work, the extraction solvent inlet adjusting valve 8 is fully opened, and when the liquid level of the extraction solvent in the drag chain leaching device reaches the preset process height, the feeding scraper 4, the feeding metering scale 5, the feeding auger 6, the chain wheel mechanism and the scraper 15 automatically start to work, the material is fed to the separation liquid permeation plate 14, and the extraction solvent inlet adjusting valve 8 is automatically closed.

[0051] S2, after the material is fed to the separation liquid permeation plate 14, the material is gradually moved to the material discharge port 28 by the chain wheel mechanism and the scraper 15, and the weight sensor 7 is triggered when the material is discharged from the material discharge port 28.

[0052] S3, when the weight sensor 7 detects that the material starts to be discharged from the material discharge port 28, the controller 16 automatically adjusts the opening degree of the extraction solvent inlet adjusting valve 8 according to the instantaneous feeding amount of the material calculated by the feeding metering scale 5 at the material feeding port 26, and adjusts the instantaneous liquid feeding amount of the extraction solvent to the calculated value according to the proportion required by the process index.

[0053] The “adjusting the opening degree of the extraction solvent inlet adjusting valve 8 according to the proportion required by the process index, and adjusting the instantaneous liquid feeding amount of the extraction solvent to the calculated value” specifically refers to:

[0054] According to the proportion required by the process index, the expected extraction solvent inlet flow rate is calculated, the instantaneous error between the expected value and the actual value of the extraction solvent inlet flow rate is taken as control parameter one, the error integral accumulation amount between the expected value and the actual value of the extraction solvent inlet flow rate is taken as control parameter two, and the error change rate between the expected value and the actual value of the extraction solvent inlet flow rate is taken as control parameter three, the control output value is obtained based on the proportional, integral and differential control algorithm of the control parameters one, two and three, the control output value determines the opening degree of the extraction solvent inlet adjusting valve 8, and the instantaneous liquid feeding amount of the extraction solvent is adjusted to half of the calculated value.

[0055] S4, the controller 16 detects the liquid level of the extraction solvent in the drag chain leaching device in real time according to the pressure type liquid level meter 10 at the bottom of the drag chain leaching device, and the controller 16 automatically adjusts the opening degree of the extraction liquid discharge adjusting valve 12 through the control algorithm, so that the liquid level of the extraction solvent in the drag chain leaching device is stabilized to the process index liquid level value range by controlling the instantaneous liquid discharge amount of the extraction liquid.

[0056] In this step, the controller 16 automatically adjusts the opening of the extraction liquid discharge regulating valve 12 through a control algorithm, and stabilizes the extraction solvent level in the drag chain leaching device to the range of the process target level value by controlling the instantaneous extraction liquid discharge volume.

[0057] The instantaneous error between the preset value and the actual value of the extraction solvent level in the drag chain leaching device is taken as the control parameter four, the integral accumulation of the error between the preset value and the actual value of the extraction solvent level is taken as the control parameter five, and the rate of change of the error between the preset value and the actual value of the extraction solvent level is taken as the control parameter six. The control parameters four, five and six are used to obtain the control output value based on the proportional, integral and differential control algorithm. The control output value determines the opening of the extraction liquid discharge regulating valve 12 and the instantaneous extraction liquid discharge flow, and simultaneously opens the extraction solvent circulating pump 11 to stabilize the extraction solvent level in the drag chain leaching device to the range of the process target level value. Then, the controller 16 adjusts the opening of the extraction solvent inlet regulating valve 8 according to the instantaneous material feeding amount of the material feeding scale 5 to readjust the instantaneous extraction solvent inlet amount to the measured value.

[0058] S5, when the weight sensor 7 detects that the material is completely discharged from the material discharge port 28, the extraction solvent inlet regulating valve 8, the chain wheel mechanism and the scraper 15 are automatically closed. When the pressure type liquid level meter 10 detects that the extraction solvent level in the drag chain leaching device decreases to the preset level value, the extraction liquid discharge regulating valve 12 and the extraction solvent circulating pump 11 are automatically closed. The weight sensor 7 is used to detect whether the extraction material has been completely discharged from the material discharge port 28.

[0059] Due to the temperature adjusting mechanism, the opening of the steam inlet regulating valve one 20, the steam inlet regulating valve two 21 and the steam inlet regulating valve three 22 at the corresponding positions below is automatically adjusted according to the extraction solvent temperatures of the front section, the middle section and the rear section of the horizontal section shell 2 detected by the temperature sensor one 17, the temperature sensor two 18 and the temperature sensor three 19 in real time. The extraction solvent temperature is stabilized at the preset process temperature by controlling the steam flow in the steam heat exchange pipeline one 23, the steam heat exchange pipeline two 24 and the steam heat exchange pipeline three 25.

[0060] The following examples are described in detail.

[0061] In combination with Figure 1 , Figure 2The application relates to an automatic adjusting system for the material-liquid ratio, liquid level and temperature of a drag chain leaching device, which comprises a drag chain leaching device shell 1, wherein the shell 1 is divided into a horizontal shell 2 and an upper inclined shell 3; the lower end of the head of the upper inclined shell 3 is provided with an extraction solvent inlet 29; a pipeline connected with the extraction solvent inlet 29 is provided with an extraction solvent inlet flowmeter 9 and an extraction solvent inlet adjusting valve 8; an explosion-proof control box and a PLC controller 16 are arranged on the left side wall of the drag chain leaching device shell 1. When the drag chain leaching device starts to work, the controller controls the extraction solvent inlet adjusting valve 8 to be fully opened, and the extraction solvent enters the drag chain leaching device. A pressure type liquid level meter 10 is arranged at the bottom of the drag chain leaching device, which can detect the liquid level of the extraction solvent in the drag chain leaching device in real time. When the liquid level of the extraction solvent in the drag chain leaching device reaches a preset liquid level range, the extraction solvent inlet adjusting valve 8 is fully closed.

[0062] Meanwhile, a feeding scraper 4, a feeding metering scale 5, a feeding auger 6, a chain wheel mechanism and a scraper 15 start to work, so that the material is fed onto the partitioned liquid-permeable plate 14 in the drag chain leaching device, and the feeding metering scale automatically measures the instantaneous feeding amount of the material.

[0063] In the embodiment, after the material is fed onto the partitioned liquid-permeable plate 14, the material is gradually moved to a material discharge port 28 by the chain wheel mechanism and the scraper 15, the material is mixed, soaked and sprayed by the extraction solvent in the drag chain leaching device, and the leaching and extraction of the target component in the material are completed; when the material is discharged from the material discharge port 28, a weight sensor 7 is triggered, the weight sensor 7 feeds back a signal to the PLC controller 16, the controller measures the required instantaneous extraction solvent inlet amount according to the instantaneous feeding amount of the feeding metering scale 5 and the process index proportion, and adjusts the extraction solvent inlet adjusting valve 8 and the extraction solvent inlet flowmeter 9 to stably keep the instantaneous extraction solvent inlet amount at half of the measured extraction solvent inlet amount by a proportional, integral and differential control algorithm. Meanwhile, the controller automatically adjusts the opening degree of an extraction liquid discharge adjusting valve 12 by a proportional, integral and differential control algorithm according to the liquid level in the drag chain leaching device detected by the pressure type liquid level meter 10, controls the instantaneous extraction liquid discharge amount by adjusting the opening degree of the extraction liquid discharge adjusting valve 12, and stably keeps the liquid level of the extraction solvent in the drag chain leaching device in the process index range. Since the material is fed into the drag chain leaching device at the beginning, the liquid level in the drag chain leaching device has reached a preset liquid level value, and when the material enters the drag chain leaching device, the liquid level in the drag chain leaching device is higher than the preset liquid level. At this moment, the instantaneous extraction solvent inlet amount is only half of the calculated inlet amount according to the material-liquid ratio, and under the adjustment of the extraction liquid discharge adjusting valve 12, the liquid level in the drag chain leaching device returns to and stabilizes at the preset liquid level height after a certain period of time. When the liquid level in the drag chain leaching device returns to and stabilizes at the preset liquid level height, the controller 16 adjusts the opening degree of the extraction solvent inlet adjusting valve 8 according to the instantaneous feeding amount of the feeding metering scale 5, and adjusts the instantaneous extraction solvent inlet amount to the measured value.

[0064] Among them, the proportional, integral, and differential control algorithm (PID) principle is as follows:

[0065]

[0066] Proportional, integral, and differential control algorithms are based on proportional gain , integral gain and differential gain Composition, with Calculate the error, proportional band This indicates that when the controlled variable produces a delta deviation, the control valve can output full-scale variation. Increasing the proportional band, or decreasing the proportional gain, enhances system stability but reduces accuracy. Conversely, decreasing the proportional band, or increasing the proportional gain, improves accuracy but reduces stability. By properly setting the three gain coefficients, the PID control algorithm can achieve precise control of the system.

[0067] In this embodiment, when the drag chain extractor is stopped, controller 16 automatically stops feeding scraper 4, feeding scale 5, and feeding auger 6. It then completely closes extraction solvent inlet regulating valve 8 and extraction liquid discharge regulating valve 12. At this point, the instantaneous material feed rate, extraction solvent inlet rate, and extraction liquid discharge rate are all zero. Driven by the sprocket mechanism and scraper 15, the remaining material in the drag chain extractor is mixed, soaked, and extracted until it is completely discharged from material discharge port 28.

[0068] In this embodiment, when the remaining material is completely discharged from the material discharge port 28, the weight sensor 7 feeds back the detected weight to the controller, and the controller automatically controls the extraction liquid discharge regulating valve 12 to adjust the instantaneous flow rate of the extraction liquid discharge to a preset value until the liquid level in the drag chain extractor drops to within the preset liquid level range. The pressure level gauge 10 feeds back the signal to the controller and stops the extraction liquid discharge regulating valve 12 and the extraction solvent circulation pump 11 from working.

[0069] In this embodiment, temperature sensor 1 17, temperature sensor 2 18, and temperature sensor 3 19 installed on the side of the drag chain extractor shell 1 detect the extraction solvent temperature in real time. When the extraction solvent temperature in the front, middle, and rear sections of the drag chain extractor deviates from the preset temperature, the controller adjusts the opening of steam inlet regulating valve 1 20, steam inlet regulating valve 2 21, and steam inlet regulating valve 3 22 accordingly through the proportional, integral, and differential (PID) control algorithm, and stabilizes the extraction solvent temperature in the drag chain extractor within the preset temperature range by adjusting the instantaneous steam inlet flow in the corresponding steam heat exchange pipe 1 23, steam heat exchange pipe 2 24, and steam heat exchange pipe 3 25 through heat exchange between steam and extraction solvent.

Claims

1. A method for automatically adjusting the material-liquid ratio, liquid level, and temperature of a drag chain extractor, characterized by: The specific process is S1. When the drag chain extractor starts working, the extraction solvent inlet regulating valve (8) is fully opened. When the extraction solvent liquid level in the drag chain extractor reaches the preset process height, the feeding scraper (4), feeding metering scale (5), feeding auger (6), sprocket mechanism and scraper (15) automatically start working to feed the material onto the separation seepage plate (14), and the extraction solvent inlet regulating valve (8) automatically closes; S2, after the material is thrown onto the separation seepage plate (14), the sprocket mechanism and the scraper (15) drive the material to gradually move toward the material discharge port (28). When the material is discharged from the material discharge port (28), the weight sensor (7) is triggered; S3. When the weight sensor (7) detects that the material starts to be discharged from the material discharge port (28), the controller (16) automatically adjusts the opening of the extraction solvent inlet regulating valve (8) in accordance with the ratio required by the process index based on the instantaneous material feeding amount measured in real time by the feeding metering scale (5) at the material feeding port (26), and adjusts the instantaneous extraction solvent feeding amount to the calculated value, wherein the weight sensor (7) is used to detect whether the extraction material has started to be discharged from the material discharge port (28); S4, the controller (16) detects the extraction solvent level in the drag chain extractor in real time according to the pressure level gauge (10) at the bottom of the drag chain extractor, and the controller (16) automatically adjusts the opening of the extraction liquid discharge regulating valve (12) through a control algorithm, and stabilizes the extraction solvent level in the drag chain extractor to within the process indicator level value range by controlling the instantaneous discharge volume of the extraction liquid; S5. When the weight sensor (7) detects that the material has been completely discharged from the material discharge port (28), the extraction solvent inlet regulating valve (8), the sprocket mechanism and the scraper (15) are automatically closed. When the pressure level gauge (10) detects that the extraction solvent level in the drag chain extractor has dropped to a preset level value, the extraction liquid discharge regulating valve (12) and the extraction solvent circulation pump (11) are automatically closed. The weight sensor (7) is used to detect whether the extraction material has been completely discharged from the material discharge port (28). In S3, "automatically adjusting the opening of the extraction solvent inlet regulating valve (8) in accordance with the required proportion of the process indicators, and adjusting the instantaneous inlet amount of the extraction solvent to the calculated value" specifically means: According to the required ratio of the process index, the expected extraction solvent inlet flow rate is calculated, the instantaneous error between the expected value and the actual value of the extraction solvent inlet flow rate is used as the first control parameter, the integral cumulative amount of the error between the expected value and the actual value of the extraction solvent inlet flow rate is used as the second control parameter, and the error change rate between the expected value and the actual value of the extraction solvent inlet flow rate is used as the third control parameter. The control output value is obtained based on the proportional, integral and differential control algorithm of the first, second and third control parameters. The control output value determines the opening of the extraction solvent inlet regulating valve (8), and the instantaneous extraction solvent inlet flow rate is adjusted to half of the calculated value; In S4, "the controller (16) automatically adjusts the opening of the extraction liquid discharge regulating valve (12) through the control algorithm, and stabilizes the extraction solvent level in the drag chain extractor within the process indicator level value range by controlling the instantaneous extraction liquid discharge volume", specifically refers to The instantaneous error between the preset value and the actual value of the extraction solvent level in the drag chain extractor is used as the fourth control parameter, the integral cumulative amount of the error between the preset value and the actual value of the extraction solvent level is used as the fifth control parameter, and the rate of change of the error between the preset value and the actual value of the extraction solvent level is used as the sixth control parameter. The fourth, fifth and sixth control parameters are used to obtain the control output value based on the proportional, integral and differential control algorithms. The control output value determines the opening of the extraction liquid discharge regulating valve (12) and the instantaneous flow rate of the extraction liquid discharge, and at the same time, the extraction solvent circulation pump (11) is turned on to stabilize the extraction solvent level in the drag chain extractor to within the process indicator level value range. Then, the controller (16) adjusts the opening of the extraction solvent inlet regulating valve (8) according to the instantaneous feeding amount of the feeding metering scale (5), and readjusts the instantaneous inlet amount of the extraction solvent to the measured value.

2. The method for automatically adjusting the material-liquid ratio, liquid level, and temperature of a drag chain extractor according to claim 1, characterized in that: According to the extraction solvent temperatures of the front, middle and rear sections of the horizontal section shell (2) detected in real time by temperature sensor 1 (17), temperature sensor 2 (18) and temperature sensor 3 (19), the openings of steam inlet regulating valve 1 (20), steam inlet regulating valve 2 (21) and steam inlet regulating valve 3 (22) at the corresponding positions below are automatically adjusted, and the extraction solvent temperature is stabilized at the preset process temperature by controlling the steam flow in steam heat exchange pipe 1 (23), steam heat exchange pipe 2 (24) and steam heat exchange pipe 3 (25).

3. A drag chain extractor material-liquid ratio, liquid level, and temperature automatic adjustment system for implementing the adjustment method according to claim 1 or 2, characterized in that: It comprises a drag chain extractor housing (1), and a control mechanism, a liquid inlet mechanism, a material feeding mechanism, a material discharging mechanism, and an extracting liquid draining mechanism arranged on the drag chain extractor housing (1), wherein the liquid inlet mechanism, the material feeding mechanism, the material discharging mechanism, and the extracting liquid draining mechanism are all connected to the control mechanism; The liquid inlet mechanism comprises an extraction solvent inlet (29) provided at one end of the drag chain extractor housing (1), a pipeline connected to the extraction solvent inlet (29), an extraction solvent inlet flow meter (9) and an extraction solvent inlet regulating valve (8) provided in sequence on the pipeline, and a pressure level gauge (10) provided at the bottom of the drag chain extractor housing (1); The feeding mechanism includes a material feeding port (26) provided at the other end of the drag chain extractor housing (1), and a feeding auger (6), a feeding weighing scale (5), and a feeding scraper (4) connected end to end are sequentially provided at the material feeding port (26); The discharge mechanism includes a material chamber arranged inside the drag chain extractor housing (1), a sprocket mechanism arranged in the material chamber, a plurality of scrapers arranged on the sprocket mechanism, a separation seepage plate (14) arranged in the material chamber and below the sprocket mechanism and the scraper (15), a material discharge port (28) arranged at the outlet of the material chamber, and a weight sensor (7) arranged at the material discharge port (28), wherein the material feed port (26) corresponds to the material chamber, the weight sensor (7) is located at the tail end of the separation seepage plate (14), and the separation seepage plate (14) is a multi-layer separation seepage plate; The extract liquid discharge mechanism comprises an extract liquid discharge port (27) provided on the drag chain extractor housing (1), an extract solvent circulation pump (11) provided in the drag chain extractor housing (1) and connected to the extract liquid discharge port (27), an extract liquid discharge regulating valve (12) and an extract liquid discharge flow meter (13) provided in sequence at the extract liquid discharge port (27) through a pipeline; The control mechanism includes a controller (16) connected to a weight sensor (7) and arranged on an outer side wall of the drag chain extractor housing (1); the controller (16) is further connected to a feeding scraper (4), a feeding auger (6), a feeding scale (5), a pressure level gauge (10), an extraction solvent inlet regulating valve (8), an extraction solvent inlet flow meter (9), an extraction solvent circulation pump (11), an extraction liquid discharge regulating valve (12), an extraction liquid discharge flow meter (13), a sprocket mechanism and a scraper (15); The invention also includes a temperature regulating mechanism connected to the controller (16), the temperature regulating mechanism including a temperature sensor arranged on the inner wall of the drag chain extractor housing (1), the height of the temperature sensor being located below the separation seepage plate (14); a steam heat exchange pipe is correspondingly arranged at the lower part of the drag chain extractor housing (1), and a steam inlet regulating valve is arranged at the steam inlet of the steam heat exchange pipe.

4. The drag chain extractor material-liquid ratio, liquid level, and temperature automatic adjustment system according to claim 3 is characterized by: There are three temperature sensors, namely temperature sensor 1 (17), temperature sensor 2 (18), and temperature sensor 3 (19); the steam heat exchange pipe corresponds to three sections of circuitous steam heat exchange pipes, namely steam heat exchange pipe 1 (23), steam heat exchange pipe 2 (24), and steam heat exchange pipe 3 (25); steam inlet regulating valve 1 (20), steam inlet regulating valve 2 (21), and steam inlet regulating valve 3 (22) are respectively provided on steam heat exchange pipe 1 (23), steam heat exchange pipe 2 (24), and steam heat exchange pipe 3 (25); temperature sensor 1 (17), temperature sensor 2 (18), temperature sensor 3 (19), steam inlet regulating valve 1 (20), steam inlet regulating valve 2 (21), and steam inlet regulating valve 3 (22) are all connected to the controller (16).

5. The drag chain extractor material-liquid ratio, liquid level, and temperature automatic adjustment system according to claim 4 is characterized in that: Temperature sensor 1 (17), temperature sensor 2 (18), and temperature sensor 3 (19) are respectively installed at the front section, middle section, and rear section of the side of the drag chain extractor housing (1).

6. The drag chain extractor material-liquid ratio, liquid level, and temperature automatic adjustment system according to claim 3 is characterized by: The drag chain extractor shell (1) comprises a horizontal section shell (2) and an upper inclined section shell (3) connected to each other. The lower end of the head of the horizontal section shell (2) is provided with an extraction liquid discharge port (27), and the upper end of the head is provided with a material feed port (26); the bottom end of the head of the upper inclined section shell (3) is provided with an extraction solvent inlet port (29), and the tail is provided with a material discharge port (28). The extraction solvent circulation pump (11) is located at the bottom end of the head in the horizontal section shell (2), and the pressure level gauge (10) is located at the bottom of the horizontal section shell (2).

7. The drag chain extractor material-liquid ratio, liquid level, and temperature automatic adjustment system according to claim 3 is characterized by: An explosion-proof control box is also provided, and the explosion-proof control box is located beside the controller (16), and the controller (16) is a PLC controller.

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