An edible oil raw material pretreatment device

Abstract

The application discloses an edible oil raw material pretreatment equipment, which comprises a rack, a feeding hopper, a multi-stage screening and impurity removing module, a self-adaptive crushing module, a wet heat conditioning module, an online moisture control system and a controller. The multi-stage screening and impurity removing module comprises a first-stage vibrating screen, a second-stage air separator and a third-stage specific gravity screen. The self-adaptive crushing module comprises a double-motor independently driven roller crusher, an online particle size detector and a hydraulic adjusting system, and the roller gap is closed-loop adjusted according to the particle size detection result. The wet heat conditioning module comprises a conditioning cavity, a steam generator, a steam nozzle and a screw conveyor, and the discharge end is provided with a near-infrared moisture detector to automatically closed-loop control the discharge moisture. The controller is electrically connected with flow, vibration, air pressure, metal detection, current sensors and particle size and moisture detectors to perform seven intelligent linkage controls. The application realizes intelligent linkage control of the whole process of oil pretreatment, and has the advantages of high impurity removal rate, controllable crushing particle size, accurate conditioning and high automation degree.

Description

Technical Field

[0001] This invention relates to the field of edible oil processing technology, and more specifically to a pretreatment device for edible oil raw materials. Background Technology

[0002] Before pressing, edible oils require pretreatment of the oilseeds, including cleaning, impurity removal, crushing, and conditioning. In the prior art, CN208104333U discloses a pre-filter for grain and oil pressing, comprising a primary screening mechanism, an air screening mechanism, and a vibrating screen mechanism installed from top to bottom, realizing the concept of multi-stage screening. CN212041480U discloses a multi-functional combined oilseed cleaning device, including a screening machine (vibrating zone box + air separation zone box) and a blower. Furthermore, edible oil processing cleaning systems have integrated vibrating screens, dust removal fans, and gravity destoners. Intelligent control systems for the roller gap of double-roll crushers have also been disclosed.

[0003] However, the existing technology still has the following shortcomings: (1) Each screening mechanism works independently, lacking coordination and intelligent linkage control; (2) The control of crushed particle size is not linked with upstream screening and downstream conditioning; (3) The moisture control in the conditioning process relies on manual experience and lacks closed-loop control based on online detection; (4) Each process operates independently and has not formed a system-level intelligent linkage.

[0004] To address the above problems, the present invention provides an edible oil raw material pretreatment device. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems mentioned above and provides an edible oil raw material pretreatment equipment, which realizes intelligent linkage control of the entire oil pretreatment process and has the advantages of high impurity removal rate, controllable crushing particle size, precise conditioning and high degree of automation.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An edible oil raw material pretreatment device, comprising: A frame; a feed hopper, located at the top of the frame; A multi-stage screening and impurity removal module is located downstream of the feed hopper and includes a first-stage vibrating screen, a second-stage air separator, and a third-stage specific gravity screen arranged in sequence. The first-stage vibrating screen is equipped with a screen box, the second-stage air separator is equipped with an L-shaped air separation chamber, and the third-stage specific gravity screen is equipped with a slag outlet. An adaptive crushing module, located downstream of the three-stage gravity screen, includes a double-roll crusher, an online particle size analyzer, and a hydraulic adjustment system. The double-roll crusher includes a fixed roll and a movable roll. The fixed roll is fixedly installed on the frame, and the bearing seat of the movable roll is slidably installed on the frame and can move closer to or further away from the fixed roll to adjust the roll gap. The wet heat conditioning module is located downstream of the adaptive crushing module and includes a conditioning chamber installed on the frame, a steam generator connected to the conditioning chamber, a steam nozzle installed in the conditioning chamber, and a screw conveyor. The steam nozzle is connected to the steam generator and is used to supply steam to the conditioning chamber. The online moisture control system includes a near-infrared moisture detector installed at the discharge end of the conditioning chamber; The controller is electrically connected to the online particle size analyzer, the near-infrared moisture analyzer, and the hydraulic adjustment system, respectively. The controller is configured to: automatically adjust the hydraulic adjustment system to change the gap between the movable roller and the fixed roller based on the crushed particle size distribution detected by the online particle size analyzer; and automatically adjust the steam supply of the steam generator based on the discharge moisture value detected by the near-infrared moisture analyzer.

[0007] Furthermore, it also includes: Vibration sensors are installed on the sieve box; A wind pressure sensor is installed inside the L-shaped air separation cavity; A metal detection sensor is installed at the slag outlet; A current sensor is installed on the drive motor of the roller crusher; The controller is electrically connected to the vibration sensor, wind pressure sensor, metal detection sensor and current sensor respectively.

[0008] Furthermore, the controller is configured to perform at least one of the following linkage controls: When the vibration sensor detects an abnormal vibration, it automatically adjusts the frequency of the vibration motor of the primary vibrating screen, and adjusts the roller gap of the double-roll crusher if the abnormality continues. Based on the wind pressure detected by the wind pressure sensor, the opening of the adjustable damper of the secondary air separator is automatically adjusted, and the air volume of the air chamber of the tertiary specific gravity screen is adjusted in conjunction with it. When the metal detection sensor detects that the metal impurity content exceeds the standard, the roller gap of the double roll crusher is automatically increased; The feed speed or roller gap of the double-roll crusher is automatically adjusted based on the motor current detected by the current sensor.

[0009] Furthermore, the fixed roller is driven to rotate independently by the first drive motor, and the movable roller is driven to rotate independently by the second drive motor. Both the first drive motor and the second drive motor are variable frequency speed control motors, which are electrically connected to the controller and whose rotational speed is coordinated and controlled by the controller.

[0010] Furthermore, the secondary air separator includes an L-shaped air separation chamber, a blower, and an adjustable damper; the L-shaped air separation chamber is composed of a vertical section and a horizontal section, one end of the horizontal section is provided with the adjustable damper, the blower is connected to the adjustable damper, and the other end of the horizontal section is provided with a light impurity discharge port.

[0011] Furthermore, the three-stage gravity screen includes a screen bed, a vibrating device, and an air chamber; the screen bed is inclined in both the longitudinal and transverse directions, with a feed inlet connected to the discharge port of the secondary air separator in the middle, a slag outlet at the higher end, and a clean material outlet at the lower end.

[0012] A linkage control method for an edible oil raw material pretreatment equipment, implemented using the aforementioned edible oil raw material pretreatment equipment, includes the following steps: Real-time detection of particle size distribution of crushed oilseeds; The crushing roller gap is automatically adjusted based on the detected particle size distribution; Real-time monitoring of the moisture content of the conditioned oilseeds; The steam supply is automatically adjusted based on the detected moisture level.

[0013] Furthermore, it also includes at least one of the following linkage controls: The feed flow rate is monitored in real time. When the feed flow rate fluctuates beyond the preset range, the screening vibration frequency of the screen box, the crushing roller speed of the double roller crusher, and the conditioning screw conveying speed of the screw conveyor are adjusted synchronously. The vibration frequency and amplitude of the screen box are detected in real time. When the vibration is abnormal, the screening vibration frequency is adjusted. When the abnormality continues, the gap between the crushing rollers is automatically adjusted. The air pressure in the L-shaped air separator is detected in real time, and the air volume supplied to the L-shaped air separator is adjusted according to the air pressure. The current of the drive motors corresponding to the fixed roller and the movable roller is detected in real time, and the feeding speed or the gap between the crushing rollers is automatically adjusted according to the current.

[0014] Furthermore, when the crushed particle size is detected to be too large, the steam supply is increased; when the crushed particle size is detected to be too small, the steam supply is decreased; when the output moisture content is detected to be too high, the crushing roller speed is reduced; when the output moisture content is too low, the crushing roller speed is increased.

[0015] Furthermore, when the content of metal impurities in the slag outlet exceeds the preset range, the gap between the crushing rollers is automatically increased; when the content of metal impurities returns to normal, the standard roller gap is restored.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects: 1. Full-process intelligent linkage control: Through the coordinated operation of the controller with flow sensor, vibration sensor, wind pressure sensor, metal detection sensor, current sensor, particle size online detector, temperature and humidity sensor, and near-infrared moisture detector, seven intelligent linkage control strategies are executed to achieve closed-loop intelligent control of the entire process from feeding, screening, crushing to conditioning. Each module automatically coordinates and adjusts according to real-time detection data without manual intervention.

[0017] 2. High efficiency of multi-stage combined screening and impurity removal: The first-stage vibrating screen intercepts large particle impurities, the second-stage L-shaped air separator uses airflow to separate light impurities, and the third-stage gravity screen uses the dual action of vibration and airflow to separate heavy impurities. The three stages work together to achieve a high impurity removal rate.

[0018] 3. Precise and controllable crushing particle size: The online particle size analyzer monitors the crushing particle size distribution in real time, and the controller automatically adjusts the roller gap through a hydraulic system in a closed loop to ensure that the crushing particle size remains stable within the target range. The dual-motor independent drive mode eliminates the problem of gear center distance changes when the moving roller moves, completely avoiding faults such as poor meshing and gear breakage in traditional long-tooth gear transmissions.

[0019] 4. Precise control of moisture content in conditioning: The near-infrared moisture detector detects the moisture content of the discharged material in real time, and the controller automatically adjusts the steam supply and exhaust volume to form a closed-loop control of "detection-feedback-adjustment" to keep the moisture content of the discharged material stable within the target range.

[0020] 5. Metal impurity early warning and protection: Metal detection sensors are installed at the slag outlet as quality sentinels of the production line. On the one hand, they monitor the upstream impurity removal effect, and on the other hand, they link to increase the gap between the crushing rollers to achieve predictive protection, effectively preventing metal impurities from damaging downstream equipment.

[0021] 6. Adaptive adjustment for feed fluctuations: The flow sensor monitors the feed flow rate in real time. When the flow rate fluctuates, the controller synchronously adjusts the vibration frequency, crushing roller speed and screw conveyor speed to maintain stable operation of the entire line. Attached Figure Description

[0022] Figure 1 This is a cross-sectional structural diagram of an edible oil raw material pretreatment equipment.

[0023] Figure 2 for Figure 1 A magnified view of point A in the image.

[0024] Figure 3 This is a control principle diagram of an edible oil raw material pretreatment equipment.

[0025] Explanation of markings in the diagram: 1-Frame, 2-Feed Hopper, 8-Flow Sensor, 31-Primary Vibrating Screen, 311-Screen Box, 312-Screen Mesh, 313-Vibration Motor, 314-Impurity Discharge Port, 315-Damping Spring, 316-Underscreen Discharge Port, 317-Elastic Chute, 32-Secondary Air Classifier, 321-Feed Inlet, 322-L-shaped Air Classifier Chamber, 323-Blower, 324-Adjustable Damper, 325-Light Impurity Discharge Port, 326-Clean Material Discharge Port, 327-First Chute, 33-Tertiary Gravity Screen, 331-Feed Inlet, 332-Screen Bed, 333-Vibration Device, 334-Air Chamber, 335-Slag Discharge Port, 336-Clean Material Discharge Port, 337-Blower Fan, 338-First L-shaped channel, 339-Second L-shaped channel, 4-Adaptive crushing module, 41-Double roll crusher, 411-Fixed roll, 412-Moving roll, 413-Slide rail, 414-Hydraulic cylinder, 415-Mounting plate, 42-Online particle size analyzer, 43-Second chute, 5-Wet heat conditioning module, 51-Third chute, 52-Steam nozzle, 53-Conditioning chamber, 54-Screw conveyor, 56-Temperature sensor, 57-Humidity sensor, 58-Exhaust port, 61-Near-infrared moisture detector, 7-Controller, 91-Vibration sensor, 92-Wind pressure sensor, 93-Metal detection sensor, 94-Current sensor. Detailed Implementation

[0026] 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.

[0027] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] like Figures 1 to 3 As shown, a preferred embodiment of the present invention provides an edible oil raw material pretreatment device, including a frame 1, a feed hopper 2, a multi-stage screening and impurity removal module, an adaptive crushing module 4, a wet heat conditioning module 5, an online moisture control system, a controller 7, and various linkage sensor groups.

[0030] In this embodiment, the frame 1 serves as the overall installation reference, constructed from welded steel profiles, providing sufficient structural strength and stability. The frame 1 employs an open frame structure, facilitating equipment installation and maintenance. Each functional module is arranged sequentially from top to bottom on the frame 1. Oil flows through each processing unit under gravity, achieving continuous pre-treatment operations. To prevent dust spillage during crushing, the adaptive crushing module 4 is equipped with a sealed enclosure, isolating the crushing area from the external environment.

[0031] The feed hopper 2 is located at the top of the frame 1, and the multi-stage screening and impurity removal module is located directly below the feed hopper 2. The flow sensor 8 is located at the discharge port of the feed hopper 2. The adaptive crushing module 4 is located below the multi-stage screening and impurity removal module, and the wet heat conditioning module 5 is located below the adaptive crushing module 4, forming a vertically layered layout from top to bottom. The discharge port of the upper-level module corresponds vertically to the feed port of the lower-level module and is connected by a chute or pipe. The oil falls into the next processing unit by gravity without the need for additional power transportation.

[0032] In this embodiment, the multi-stage screening and impurity removal module includes a first-stage vibrating screen 31, a second-stage air separator 32, and a third-stage gravity screen 33 arranged in sequence, forming a three-stage combined screening and impurity removal system.

[0033] In this embodiment, the primary vibrating screen 31 includes a screen box 311, a screen mesh 312, and a vibrating motor 313. The screen box 311 is located directly below the discharge port of the feed hopper 2. The screen box 311 is arranged at an angle, with its high end located on one side of the feed port and its low end having a waste discharge port 314. The screen box 311 is supported on the frame 1 by vibration damping springs 315. The vibrating motor 313 is fixedly installed on the outer wall of the screen box 311, driving the screen box 311 to vibrate. The screen mesh 312 is installed inside the screen box 311 using a quick-change structure. The quick-change structure can be provided with a pressing flange on the inner wall of the screen box 311, and the screen mesh 312 can be detached and pressed onto the flange, making it convenient to replace the screen mesh 312 according to different oil materials. The screen mesh aperture is 10-15mm. The oil falls from the feed hopper 2 into the high end of the screen 312. Under the action of vibration, it moves along the screen surface to the low end. Large particles of impurities such as stones and soil larger than the screen mesh size are intercepted above the screen surface and discharged from the discharge port 314 at the low end.

[0034] In this embodiment, a vibration sensor 91 is installed on the screen box 311 to detect the vibration frequency and amplitude of the screen box in real time. The vibration sensor 91 is electrically connected to the controller 7 and transmits the detected vibration signal to the controller 7 in real time. When the vibration frequency or amplitude deviates from the preset range, the controller 7 automatically adjusts the frequency converter output of the vibration motor 313 to restore the vibration of the screen box to a stable state.

[0035] In this embodiment, the bottom of the sieve box 311 is provided with a discharge port 316 for undersize material, and the top of the secondary air separator 32 is provided with a feed port 321. The discharge port 316 and the feed port 321 are connected by an elastic chute 317. The elastic chute 317 is made of food-grade plastic. The oil slides into the secondary air separator 32 along the chute wall under the action of gravity.

[0036] In this embodiment, the secondary air separator 32 includes an L-shaped air separator chamber 322, a blower 323, and an adjustable damper 324. The L-shaped air separator chamber 322 consists of a vertical section and a horizontal section, and is fixedly installed on the frame 1. The top of the vertical section is provided with a feed inlet 321. The bottom of the vertical section is provided with a clean material outlet 326. The adjustable damper 324 is installed at one end of the horizontal section, and the air outlet of the blower 323 is connected to the adjustable damper 324. The other end of the horizontal section is provided with a light impurity discharge outlet 325, which is connected to a dust collection device through a pipe.

[0037] In this embodiment, a wind pressure sensor 92 is installed inside the L-shaped air separation chamber 322 to detect the internal wind pressure in real time. The wind pressure sensor 92 is electrically connected to the controller 7 and transmits the detected wind pressure signal to the controller 7 in real time. The controller 7 automatically adjusts the opening of the adjustable damper 324 according to the wind pressure signal to stabilize the wind pressure in the L-shaped air separation chamber 322 within a preset range.

[0038] The airflow generated by blower 323 enters the L-shaped air separator 322 from one end of the transverse section, carrying light impurities out from the other end. The light impurities are discharged from the light impurity outlet 325 with the airflow, while the saturated oil, due to its greater weight, is discharged from the bottom clean material outlet 326.

[0039] In this embodiment, the three-stage gravity screen 33 is provided with a feed inlet 331, and the clean material outlet 326 is connected to the feed inlet 331 through a first chute 327. The saturated oil falls into the middle of the three-stage gravity screen 33 under the action of gravity.

[0040] In this embodiment, the three-stage gravity screen 33 includes a screen bed 332, a vibrating device 333, and an air chamber 334. The screen bed 332 has a rectangular frame structure with a built-in screen. The screen bed 332 is inclined, and its higher end is provided with a slag outlet 335 for discharging heavy impurities. Specifically, a first L-shaped channel 338 is provided corresponding to the higher end of the screen bed 332, and the top of the first L-shaped channel 338 extends towards the screen bed 332 but is not connected to the screen bed 332, so that a slag outlet 335 is formed between the screen bed 332 and the first L-shaped channel 338. Its lower end is provided with a clean material outlet 336 for discharging the clean material after gravity screening. Specifically, a second L-shaped channel 339 is provided corresponding to the lower end of the screen bed 332, and the top of the second L-shaped channel 339 extends towards the screen bed 332 but is not connected to the screen bed 332, so that a clean material outlet 336 is formed between the screen bed 332 and the second L-shaped channel 339. The first L-shaped channel 338 is connected to the outside and is used to discharge heavy impurities with a larger specific gravity. The sieve bed 332 has inclination angles in both the longitudinal and transverse directions, referred to as the longitudinal inclination angle and the transverse inclination angle, respectively. A vibrating device 333 is installed at the bottom of the sieve bed 332 and drives the sieve bed 332 to reciprocate through an eccentric wheel. The vibration device 333 driving the sieve bed 332 to reciprocate is prior art; for example, see CN208104333U, which discloses an eccentric disc, connecting rod, and the arrangement of the connecting rod in a pre-filter for grain and oil pressing. The air chamber 334 is installed directly below the sieve bed 332 and has a flat box structure, with a blower 337 connected to its bottom.

[0041] The material, after being screened by the secondary air separator 32, enters the screen bed 332 from the middle through the first chute 327. The material stratifies in the middle of the screen bed due to the combined effects of vibration and airflow. Heavier impurities settle at the bottom of the material layer and contact the screen surface. Under the vibration of the screen bed 332, they move towards the upper end and are discharged from the slag outlet 335 at the higher end of the screen bed, and then through the first L-shaped channel 338. Oily materials float on the upper layer of the material and, supported by airflow and gravity, drift towards the lower end, exiting from the clean material outlet 336 at the lower end of the screen bed, and then through the second L-shaped channel 339 into the adaptive crushing module 4.

[0042] In this embodiment, a metal detection sensor 93 is installed at the slag outlet 335 to detect the content of metal impurities in the slag in real time. The metal detection sensor 93 is electrically connected to the controller 7. When the detected metal impurity content exceeds a preset range, the controller 7 automatically sends a signal to the adaptive crushing module 4 to increase the gap between the crushing rollers, thereby reducing the risk of metal impurities being crushed and mixed into the oil. The metal detection sensor 93 has the following effects: First, since the heavy impurities discharged from the slag outlet 335 do not enter subsequent processes, the metal detection sensor 93 does not directly protect the crushing rollers, but serves as an online monitoring point for the impurity removal effect of the production line. When the metal detection sensor 93 continuously or frequently detects metal impurities, it indicates that the impurity removal effect of the upstream primary vibrating screen 31 or the secondary air separator 32 has decreased. The controller 7 issues a warning signal, prompting the operator to check the upstream equipment in time and eliminate the impurity removal failure at the initial stage. Secondly, although the impurities discharged from the slag outlet 335 do not enter the crushing rollers, if metal impurities are continuously detected at the slag outlet 335, it means that metal impurities may also be present in the oilseeds that enter the downstream crushing and pressing processes with the clean material. Therefore, the controller 7 performs predictive protection based on the signal from the metal detection sensor 93: when the detected metal impurity content exceeds the preset range, the controller 7 automatically increases the roller gap of the double-roll crusher 41, allowing any potentially mixed metal impurities to pass through smoothly without damaging the roller surface; when the metal impurity content returns to normal, the standard roller gap is restored. This linkage control achieves integrated intelligent protection of "detection-early warning-protection," effectively preventing damage to downstream equipment due to the intrusion of metal impurities.

[0043] In this embodiment, the adaptive crushing module 4 is positioned directly below the second L-shaped channel 339. The second L-shaped channel 339 and the feed inlet of the adaptive crushing module 4 are connected via a second chute 43. The clean material falls from the clean material outlet 336 into the second chute 43 under the influence of gravity.

[0044] In this embodiment, the adaptive crushing module 4 includes a double roll crusher 41, an online particle size analyzer 42, a hydraulic adjustment system 43, and a current sensor 94. The double roll crusher 41 includes a fixed roll 411 and a movable roll 412. The bearing seat of the fixed roll 411 is fixedly installed on the frame 1 and its position cannot be moved. Specifically, the fixed roll 411 is independently driven by a first drive motor, which is connected to the first grooved pulley of the fixed roll 411 via a first V-belt, driving the fixed roll 411 to rotate around its axis. The movable roller 412 is slidably mounted on the frame 1 and driven by the hydraulic cylinder 414 to move horizontally to adjust the gap between the two rollers. Specifically, the frame 1 has a slide rail 413 extending laterally along the frame 1. A mounting plate 415 is slidably mounted within the slide rail 413. The second drive motor is mounted on the mounting plate 415 and is connected to the second grooved pulley of the movable roller 412 via a second V-belt, driving the movable roller 412 to rotate in the opposite direction around its axis. The hydraulic cylinder 414 is mounted on the frame 1, and its working rod is connected to the mounting plate 415. When the movable roller 412 moves horizontally under the drive of the hydraulic cylinder 414 to adjust the roller gap, the second drive motor moves along with the movable roller 412. There is no problem of gear center distance change, completely avoiding the failures such as poor meshing and gear breakage caused by center distance changes in traditional long-tooth gear transmissions. To ensure the matching speed of the two rollers, both the first and second drive motors are variable frequency speed control motors and are electrically connected to the controller 7. The controller 7 coordinates the control of the two motors through the frequency converter, so that the fixed roller 411 and the movable roller 412 keep rotating synchronously in opposite directions, ensuring uniform crushing effect.

[0045] In this embodiment, the online particle size analyzer 42 is installed at the discharge port of the double-roll crusher 41, and uses image recognition technology to detect the particle size distribution of the crushed oil in real time. The online particle size analyzer 42 includes an industrial camera, a light source, and an image processing module, all of which are electrically connected to the controller 7. When the detected particle size is too large, the controller 7 controls the proportional reversing valve to supply oil to the hydraulic cylinder, pushing the movable roller 412 to move towards the fixed roller 411, reducing the roller gap; when the particle size is too small, the controller controls the hydraulic cylinder to reverse the action, increasing the roller gap, forming a closed-loop adjustment system.

[0046] In this embodiment, the hydraulic regulating system 43 includes a hydraulic pump station, a proportional directional valve, a displacement sensor, and the aforementioned hydraulic cylinder 414. The hydraulic pump station is installed on one side of the frame 1 and supplies pressurized oil to the system through a high-pressure oil pipe. The proportional directional valve is installed on the frame 1 near the bearing seat of the movable roller 412. Its oil inlet is connected to the hydraulic pump station, and its two working oil ports are respectively connected to the rodless chamber and the rod chamber of the hydraulic cylinder 434, used to control the extension or retraction of the hydraulic cylinder 434. The displacement sensor 433 is installed on the cylinder body of the hydraulic cylinder 434 and is used to detect the displacement of the movable roller 412 in real time and feed it back to the controller 7. The controller 7 compares the particle size distribution data fed back by the online particle size analyzer 42 with the preset target particle size range.

[0047] Current sensors 94 are installed on the first and second drive motors of the double roll crusher 41 to monitor the motor operating current in real time. The current sensors 94 are electrically connected to the controller 7 and transmit the detected current signal to the controller 7 in real time. When the controller 7 detects that the motor current exceeds the preset range, it determines that the crushing load is abnormal and automatically adjusts the feeding speed or roller gap of the double roll crusher 41 to adjust the crushing load.

[0048] In this embodiment, the wet heat conditioning module 5 is located downstream of the roll crusher 41 and includes a conditioning chamber 53, a steam generator, a steam nozzle 52, a screw conveyor 54, a temperature sensor 56, and a humidity sensor 57.

[0049] The conditioning chamber 53 is a horizontal cylindrical shape, mounted horizontally on the frame 1, and is made of stainless steel. A feed inlet is located at the top of one end of the conditioning chamber 53, connected to the discharge port of the double-roll crusher 41 via a third chute 51; a discharge port is located at the bottom of the other end of the conditioning chamber 53. An exhaust port 58 is located at the top of the conditioning chamber 53, and an adjustable exhaust valve is installed at the exhaust port 58. Multiple steam nozzles 52 are distributed along the length of the conditioning chamber 53, and multiple nozzle holes are evenly distributed on the steam nozzles 52. A steam generator is located on one side of the frame 1, and its outlet is connected to the steam nozzles 52 via a steam pipeline equipped with a steam regulating valve. A screw conveyor 54 is located inside the conditioning chamber 53, extending along the axis of the conditioning chamber 53, with its starting end located below the feed inlet. The screw conveyor 54 is driven by a variable frequency motor, and its speed is adjustable, controlling the residence time of the oil in the conditioning chamber 53 by adjusting the speed. Temperature sensor 56 and humidity sensor 57 are respectively installed at the discharge end of conditioning chamber 53 to monitor the temperature and relative humidity of the conditioned oil in real time. Both are electrically connected to controller 7.

[0050] In this embodiment, the online moisture control system includes a near-infrared moisture detector 61 and an intelligent control unit. The near-infrared moisture detector 61 is located at the outlet of the conditioning chamber 53 and uses non-contact near-infrared spectroscopy to detect the moisture content of the discharged oil in real time. The near-infrared moisture detector 61 is electrically connected to the controller 7. The intelligent control unit is integrated into the controller 7 and is used to receive the moisture signal from the near-infrared moisture detector 61 and compare it with a preset target moisture value, such as 7%-9% required for pressing. When the detected discharged moisture content is higher than the target value, the controller 7 automatically closes the steam regulating valve and opens the exhaust valve; when the detected discharged moisture content is lower than the target value, the controller 7 automatically opens the steam regulating valve, closes the exhaust valve, and appropriately reduces the speed of the screw conveyor 54 to prolong the residence time of the oil in the conditioning chamber. The online moisture control system forms a complete "detection-feedback-adjustment" closed-loop control system.

[0051] In this embodiment, the controller 7 is a programmable logic controller or an industrial microcontroller, which stores a database of pretreatment process parameters for various oil types.

[0052] The controller 7 is configured for the first linkage control: when the vibration sensor 91 detects that the vibration frequency or amplitude of the screen box 311 deviates from the preset range, it automatically adjusts the frequency converter output frequency of the vibration motor 313 to restore stable vibration; at the same time, when the abnormal vibration continues for more than the preset time, the controller 7 judges that the screening efficiency has decreased and automatically adjusts the roller gap of the double roll crusher 41 to prevent excessively large or small particles from entering the conditioning stage.

[0053] The controller 7 is configured for second linkage control: based on the wind pressure inside the L-shaped air separation chamber 322 detected by the wind pressure sensor 92, the opening of the adjustable damper 324 is automatically adjusted to keep the wind pressure in the L-shaped air separation chamber 322 stable within a preset range; at the same time, when the wind pressure fluctuation exceeds the preset range, the controller 7 adjusts the air volume of the three-stage gravity screen 33 in linkage to maintain the consistency of the two-stage air separation.

[0054] The controller 7 is configured for third linkage control: when the metal detection sensor 93 detects that the metal impurity content at the slag outlet 335 exceeds the preset range, it automatically increases the roller gap of the double roll crusher 41 to reduce the risk of metal impurities being crushed and refined and mixed into the oil; when the metal impurity content returns to normal, it restores the standard roller gap.

[0055] The controller 7 is configured for fourth-level linkage control: based on the crushing motor current detected by the current sensor 94, it automatically adjusts the feeding speed or roller gap of the double-roll crusher 41. When the current exceeds 90% of the rated value, it is determined that the crushing load is too large, and the controller 7 automatically reduces the feeding speed or appropriately increases the roller gap; when the current is lower than 60% of the rated value, it is determined that the load is insufficient, and the controller 7 automatically increases the feeding speed.

[0056] Controller 7 is configured for fifth-level linkage control: based on the particle size distribution detected by the online particle size analyzer 42, it automatically adjusts the steam supply of the steam generator. When the particle size is too large, the specific surface area of ​​the oil decreases, and controller 7 automatically increases the steam supply; when the particle size is too small, controller 7 automatically decreases the steam supply.

[0057] The controller 7 is configured for sixth-linkage control: based on the discharge moisture value detected by the near-infrared moisture detector 61, the speed of the double-roll crusher 41 is automatically adjusted. When the discharge moisture is too high, the controller 7 reduces the crushing roller speed to reduce excessive water loss caused by frictional heating; when the discharge moisture is too low, the controller 7 increases the crushing roller speed to appropriately increase frictional heat.

[0058] The controller 7 is configured as the seventh linkage control: when the flow sensor 8 detects that the feed flow fluctuation exceeds the preset range, such as ±10%, the frequency of the vibrating motor 313, the roller speed of the double roll crusher 41 and the speed of the screw conveyor 54 are adjusted synchronously to ensure that the entire pretreatment line remains stable when the flow fluctuates.

[0059] Controller 7 is the core of the entire control system, communicating bidirectionally with both the sensor layer and the execution layer. The sensor layer includes a flow sensor 8, a vibration sensor 91, a wind pressure sensor 92, a metal detection sensor 93, a current sensor 94, an online particle size analyzer 42, a temperature sensor 56, a humidity sensor 57, and a near-infrared moisture detector 61. Each sensor collects the operating parameters of its corresponding workstation in real time and transmits them to controller 7. Controller 7 has a built-in linkage control unit that executes seven intelligent linkage control strategies, from the first to the seventh. Controller 7 compares the sensor signals with preset thresholds and sends control commands to each actuator based on the deviation value, achieving closed-loop intelligent control throughout the entire process.

[0060] Working principle: Step 1: Feeding and Flow Monitoring: The operator selects the type of oil to be processed via controller 7, which automatically loads the corresponding process parameters. The oil enters the equipment through feed hopper 2, and flow sensor 8 monitors the feed flow rate in real time.

[0061] Step 2: Multi-stage screening and impurity removal: The oilseed enters the primary vibrating screen 31, where large particles of impurities are intercepted. The undersize material enters the secondary air separator 32, where light impurities are discharged with the airflow. The saturated oilseed falls into the middle of the tertiary gravity screen 33, where heavy impurities are discharged from the slag outlet 335, and the oilseed is discharged from the clean material outlet 336.

[0062] Step 3: Adaptive Crushing: The clean material enters the double-roll crusher 41. The fixed roll 411 and the movable roll 412 are independently driven by their respective drive motors, rotating in opposite directions to crush the oil material to the target particle size. The online particle size analyzer 42 monitors the particle size distribution in real time, and the controller 7 automatically adjusts the roll gap through the hydraulic adjustment system 43 based on the detection results, forming a closed-loop control. The current sensor 94 monitors the crushing load in real time.

[0063] Step 4: Humid Heat Conditioning: The crushed oil enters through the feed inlet at one end of the conditioning chamber 53, and the screw conveyor 54 pushes the oil towards the discharge outlet. Steam heats and humidifies the oil. Temperature sensor 56 and humidity sensor 57 monitor the conditioning status in real time, and controller 7 adjusts the steam volume and screw conveyor speed based on the feedback signals.

[0064] Step 5: Online moisture control: The near-infrared moisture detector 61 detects the moisture content of the discharged material in real time. The controller 7 compares the detected value with the preset target moisture value and automatically adjusts the steam volume and exhaust volume to keep the moisture content of the discharged material stable within the preset target range.

[0065] Step 6: Intelligent linkage adjustment: Throughout the entire operation, the controller 7 continuously monitors all sensor signals and automatically executes the linkage control functions one through seven to ensure the stable operation of the entire pretreatment line.

[0066] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A pretreatment device for edible oil raw materials, characterized in that, include: Rack (1); A feed hopper (2) is located on top of the frame (1); A multi-stage screening and impurity removal module is located downstream of the feed hopper (2), including a first-stage vibrating screen (31), a second-stage air separator (32), and a third-stage gravity screen (33) arranged in sequence. The first-stage vibrating screen (31) is provided with a screen box (311), the second-stage air separator (32) is provided with an L-shaped air separation chamber (322), and the third-stage gravity screen (33) is provided with a slag outlet (335). An adaptive crushing module (4) is located downstream of the three-stage gravity screen (33) and includes a double roll crusher (41), an online particle size analyzer (42), and a hydraulic adjustment system (43). The double roll crusher (41) includes a fixed roll (411) and a movable roll (412). The fixed roll (411) is fixedly installed on the frame (1), and the bearing seat of the movable roll (412) is slidably installed on the frame (1) and can move closer to or further away from the fixed roll (411) to adjust the roll gap. The wet heat conditioning module (5) is located downstream of the adaptive crushing module (4) and includes a conditioning chamber (53) installed on the frame (1), a steam generator (51) connected to the conditioning chamber (53), a steam nozzle (52) installed in the conditioning chamber (53), and a screw conveyor (54). The steam nozzle (52) is connected to the steam generator (51) and is used to supply steam to the conditioning chamber (53). The online moisture control system includes a near-infrared moisture detector (61) installed at the discharge end of the conditioning chamber (53). The controller (7) is electrically connected to the online particle size analyzer (42), the near-infrared moisture analyzer (61), and the hydraulic adjustment system (43), respectively. The controller (7) is configured to: automatically adjust the hydraulic adjustment system (43) to change the gap between the movable roller (412) and the fixed roller (411) according to the crushed particle size distribution detected by the online particle size detector (42); and automatically adjust the steam supply of the steam generator (51) according to the discharge moisture value detected by the near-infrared moisture detector (61).

2. The edible oil raw material pretreatment equipment according to claim 1, characterized in that, Also includes: Vibration sensor (91) is installed on the sieve box (311). The wind pressure sensor (92) is installed inside the L-shaped wind separation cavity (322). A metal detection sensor (93) is installed at the slag outlet (335). A current sensor (94) is installed on the drive motor of the double roll crusher (41). The controller (7) is electrically connected to the vibration sensor (91), wind pressure sensor (92), metal detection sensor (93) and current sensor (94) respectively.

3. The edible oil raw material pretreatment equipment according to claim 2, characterized in that, The controller (7) is configured to perform at least one of the following linkage controls: When the vibration sensor (91) detects an abnormal vibration, it automatically adjusts the vibration motor frequency of the primary vibrating screen (31) and adjusts the roller gap of the double roll crusher (41) when the abnormality continues. Based on the wind pressure detected by the wind pressure sensor (92), the adjustable damper opening of the secondary wind separator (32) is automatically adjusted, and the air volume of the air chamber of the tertiary specific gravity screen (33) is adjusted in conjunction with it. When the metal detection sensor (93) detects that the metal impurity content exceeds the standard, it automatically increases the roller gap of the double roll crusher (41); The feed speed or roller gap of the double roll crusher (41) is automatically adjusted based on the motor current detected by the current sensor (94).

4. The edible oil raw material pretreatment equipment according to claim 1, characterized in that: The fixed roller (411) is driven to rotate independently by the first drive motor, and the movable roller (412) is driven to rotate independently by the second drive motor (414). Both the first drive motor and the second drive motor (414) are variable frequency speed control motors, which are electrically connected to the controller (7) and whose rotational speed is coordinated and controlled by the controller (7).

5. The edible oil raw material pretreatment equipment according to claim 1, characterized in that: The secondary air separator (32) includes an L-shaped air separator cavity (322), a blower (323), and an adjustable damper (324); the L-shaped air separator cavity (322) is composed of a vertical section and a horizontal section, one end of the horizontal section is provided with the adjustable damper (324), the blower (323) is connected to the adjustable damper (324), and the other end of the horizontal section is provided with a light impurity discharge port (325).

6. The edible oil raw material pretreatment equipment according to claim 1, characterized in that: The three-stage gravity screen (33) includes a screen bed (332), a vibrating device (333), and an air chamber (334). The screen bed (332) has an inclination angle in both the longitudinal and transverse directions. The middle part has an inlet (331) that connects to the outlet of the secondary air separator (32), the higher end has a slag outlet (335), and the lower end has a clean material outlet (336).

7. A linkage control method for edible oil raw material pretreatment equipment, characterized in that, It employs the edible oil raw material pretreatment equipment described in claim 1, and the method includes the following steps: Real-time detection of particle size distribution of crushed oilseeds; The crushing roller gap is automatically adjusted based on the detected particle size distribution; Real-time monitoring of the moisture content of the conditioned oilseeds; The steam supply is automatically adjusted based on the detected moisture level.

8. The linkage control method for an edible oil raw material pretreatment equipment according to claim 7, characterized in that, It also includes at least one of the following linkage controls: Real-time detection of feed flow rate; when the feed flow rate fluctuates beyond the preset range, synchronously adjust the screening vibration frequency of the screen box (311), the crushing roller speed of the double roller crusher (41), and the conditioning screw conveying speed of the screw conveyor (54). The vibration frequency and amplitude of the screen box (311) are detected in real time. When the vibration is abnormal, the screening vibration frequency is adjusted. When the abnormality continues, the gap between the crushing rollers is automatically adjusted. The air pressure of the L-shaped air separator (322) is detected in real time, and the air volume supplied to the L-shaped air separator (322) is adjusted according to the air pressure. The current of the drive motors corresponding to the fixed roller (411) and the movable roller (412) is detected in real time, and the feeding speed or the gap between the crushing rollers is automatically adjusted according to the current.

9. The linkage control method for an edible oil raw material pretreatment equipment according to claim 8, characterized in that: When the crushed particle size is detected to be too large, increase the steam supply; when the crushed particle size is detected to be too small, decrease the steam supply; when the output moisture content is detected to be too high, reduce the crushing roller speed; when the output moisture content is too low, increase the crushing roller speed.

10. The linkage control method for an edible oil raw material pretreatment equipment according to claim 8, characterized in that: When the content of metal impurities in the slag outlet (335) exceeds the preset range, the gap between the crushing rollers is automatically increased; when the content of metal impurities returns to normal, the standard roller gap is restored.

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