A pressing device for grain and oil production and a pressing method thereof

Abstract

This invention relates to the field of grain and oil production technology, specifically to a pressing device and method for grain and oil production. The device includes a pressing table and a pressing cage mounted on the pressing table. A pressing cover is provided on top of the pressing cage, and pressing mechanisms for applying pressure to the pressing cover are provided on both sides of the pressing table. It also includes a pressure detection unit, a displacement detection unit, and a control unit. The pressure detection unit is located in the contact area between the pull rope and the pressing cover; the displacement detection unit is located on the pressing cover; the control unit is connected to the pressure detection unit and a servo motor signal, and is used to control the servo motor to start and stop in a jogging manner according to the pressure signal. By setting pressure detection units on the pressing cover and pull rope to form redundant monitoring, real-time monitoring and closed-loop control of the pressing pressure are achieved. Through adaptive control of multiple parameters such as pressure, temperature, oil extraction rate, and stroke, the pressing parameters can be dynamically optimized according to different oilseed varieties and pressing stages, realizing intelligent and precise control of the pressing process.

Description

Technical Field

[0001] This invention relates to the field of grain and oil production technology, specifically to a pressing device and pressing method for grain and oil production. Background Technology

[0002] In traditional grain and oil pressing processes, raw materials are typically loaded into molds and stacked layer upon layer on a pressing table. Wooden levers are then placed on top, with steel wires attached to both ends. A rotating shaft winds the lower end of the wires around the side walls of the pressing table, causing the levers to descend and compress the raw materials. However, this pressing method has significant drawbacks in practice: because continuous force is required to maintain pressing pressure, once the force is stopped, the pressure gradually rebounds and is released. Furthermore, as the pressing process progresses and the molds are compacted, this rebound becomes increasingly pronounced, making manual pressing extremely laborious and severely impacting pressing efficiency and operational safety.

[0003] Currently, some existing technologies have attempted to address the aforementioned problems through improvements in mechanical structures. For example, patent application CN221067267U discloses an easily adjustable peanut pressing device, which includes a positioning unit within the casing to adjust for oil tanks of different diameters, and a worm gear and worm shaft to achieve a self-locking function. Patent application CN201620859666.7 discloses an automatic oil press adaptable to various oil-pressing raw materials, utilizing a worm gear and worm shaft mechanism to achieve a self-locking function. Specifically, a lead screw shaft connects to the worm gear, and a lead screw drive motor connects to the worm shaft, with the worm gear and worm shaft meshing. Patent application CN203818609U discloses a worm gear and worm shaft transmission locking device for a small oil press, which drives the worm gear to rotate via the worm shaft, allowing the pressing chamber to be both connected and disassembled.

[0004] However, the existing worm gear self-locking structures are mostly used for auxiliary functions such as locking the pressing chamber or adjusting the equipment height. They are not directly applied to solve the problem of continuous motor load caused by pressure rebound during the pressing process, nor are they combined with automated monitoring and control methods to achieve precise closed-loop control of the pressing process. Therefore, it is necessary to develop a grain and oil production pressing device and its pressing method that can fully utilize the self-locking characteristics of the worm gear and combine it with automated control technology to solve the above-mentioned technical problems. Summary of the Invention

[0005] In order to overcome the defects in the prior art, the purpose of this invention is to provide a pressing device and pressing method for grain and oil production, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, on the one hand, the present invention provides a pressing device for grain and oil production, including a pressing table and a pressing cage disposed on the pressing table; a pressing cover is provided on the top of the pressing cage, and pressing mechanisms for applying pressure to the pressing cover are provided on both sides of the pressing table; the pressing mechanism includes at least two pull ropes disposed above the pressing cover, a winding wheel disposed on both sides of the pressing table for winding the pull ropes, and a worm gear transmission mechanism and a servo motor for driving the winding wheel to rotate; It also includes a pressure detection unit, a displacement detection unit, and a control unit; the pressure detection unit is located in the contact area between the pull rope and the press cover, and is used to detect the pressing pressure and output a pressure signal; the displacement detection unit is located on the press cover, and is used to detect the downward stroke of the press cover and output a displacement signal to the control unit; the oil output detection unit is located at the oil collection position of the pressing table, and is used to detect the oil output or oil output rate and output a flow rate signal to the control unit; the control unit is signal-connected to the pressure detection unit and the servo motor, and is used to control the servo motor to start and stop in a jogging manner according to the pressure signal, so as to maintain the pressing pressure within a preset range; The control unit is also used to perform multi-parameter fusion processing based on at least two of the pressure signal, flow signal and displacement signal to dynamically optimize the pressing parameters. During the pressing process, the control unit collects multiple sensor signals in real time, makes comprehensive judgments through the built-in adaptive control algorithm, and dynamically adjusts the preset pressure threshold, motor jogging frequency and pressure holding time control parameters.

[0007] As a further improvement to this technical solution, the pressure detection unit includes a first pressure sensor disposed on the top of the press cover and a second pressure sensor disposed on the pull rope. The first pressure sensor and the second pressure sensor are respectively connected to the control unit to form redundant monitoring.

[0008] As a further improvement to this technical solution, a temperature detection unit is also included. The temperature detection unit is located in the oil outlet area of ​​the pressing table and is used to detect the pressing temperature and output a temperature signal to the control unit.

[0009] As a further improvement to this technical solution, a current detection unit is also included. The current detection unit is electrically connected to the servo motor and is used to detect the operating current of the servo motor and output a current signal to the control unit.

[0010] As a further improvement to this technical solution, the top surface of the press cover is provided with a rope support platform, and the inside of the rope support platform is provided with at least two protective grooves for placing the pull rope; a pulley is provided below the winding wheel, and the middle part of one of the pull ropes overlaps in the protective groove, and its two ends pass around the pulleys on both sides of the press table and then wind around the winding wheel to form a pressure state.

[0011] As a further improvement to this technical solution, the pressing cage is composed of several columns embedded in a ring on the pressing table, wherein a movable rod is provided facing the oil outlet for opening the cage opening and taking out the cake mold; a top cover is fixedly provided on the top of the pressing cage, and a hydraulic cylinder is installed below the top cover for lifting the pressing cover to reset.

[0012] As a further improvement to this technical solution, the worm gear transmission mechanism includes a worm wheel that is coaxially and fixedly connected to the winding wheel and a worm that meshes with the worm wheel. The worm is driven by the output end of the servo motor.

[0013] As a further improvement to this technical solution, wheel seats, shaft seats and motor seats are fixedly provided on both sides of the pressing table to support the winding wheel, worm gear and servo motor respectively.

[0014] As a further improvement to this technical solution, the press cover is stably placed inside the press cage by being movably sleeved with the movable rod.

[0015] On the other hand, the present invention provides a pressing method for grain and oil production, implemented using the above-mentioned pressing apparatus for grain and oil production, comprising the following steps: S1. Stack several cake molds containing grain and oil raw materials in the press cage, and cover the upper cake mold with the press cover. S2. The pull rope passes over the top of the press cover, changes direction via the pulley, and connects to the take-up wheel; S3. Start the servo motor to drive the worm gear transmission mechanism to rotate the winding wheel and wind up the pulling rope, and apply pressure to the pressing cover to press down several cake molds; S4. The pressing pressure is detected in real time by the pressure detection unit set on the press cover and the pull rope, and the pressure signal is transmitted to the control unit. S5. The control unit compares the received pressure signal with the preset pressure threshold. When the pressure value is lower than the preset lower limit, it controls the servo motor to start inching to continue winding. When the pressure value reaches the preset upper limit, it controls the servo motor to stop running and uses the self-locking characteristic of the worm gear to maintain the current pressure and maintain pressure for oil discharge of several dies. S6. Repeat steps S4 to S5 until pressing is complete.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The pressing device and pressing method for grain and oil production achieve a self-locking function through a worm gear transmission mechanism. Combined with the control unit's inching control of the geared motor, the geared motor can maintain the pressing pressure without continuous operation. This effectively solves the problem of continuous load caused by pressure rebound in traditional pressing methods, reduces motor energy consumption, and extends the service life of the equipment.

[0017] 2. The pressing device and pressing method for grain and oil production, by setting pressure detection units on the press cover and the pull rope to form redundant monitoring, realizes real-time monitoring and closed-loop control of pressing pressure, which can ensure that the pressing process is always in the optimal pressure range, thereby improving pressing efficiency and oil yield.

[0018] 3. The pressing device and pressing method for grain and oil production, through adaptive control of multiple parameters such as pressure, temperature, oil output rate and stroke, can dynamically optimize pressing parameters according to different oilseed varieties and pressing stages, thus realizing intelligent and precise control of the pressing process. Attached Figure Description

[0019] The accompanying drawings described herein are for illustrative purposes only. The shapes and proportions of the components in the drawings are merely schematic and intended to aid in understanding the invention. They are not intended to specifically limit the shapes and proportions of the components of the invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 The main view; Figure 3 This is a schematic diagram of the pressing table structure of the present invention; Figure 4 This is one of the schematic diagrams of the assembly structure of the pressing mechanism of the present invention; Figure 5 This is a second schematic diagram of the assembly structure of the pressing mechanism of the present invention; Figure 6 This is a schematic diagram of the press cap assembly structure of the present invention; Figure 7 This is a schematic diagram of the assembly structure of the pressing mechanism of the present invention; The meanings of the labels in the diagram are as follows: 100. Pressing table; 110. Pressing cage; 111. Movable rod; 120. Press cover; 121. Rope support platform; 122. Protective groove; 130. Hydraulic cylinder; 140. Wheel seat; 150. Shaft seat; 160. Motor seat; 200. Pressing mechanism; 210. Pulling rope; 211. Pulley; 220. Winding reel; 221. Worm gear; 222. Worm; 230. Servo motor. Detailed Implementation

[0021] Under the guidance of this invention, any possible variations of this invention by those skilled in the art should be considered within its scope. The directional terms used herein are based on the orientations shown in the accompanying drawings and are for ease of description and simplification; therefore, they should not be construed as limiting the invention. Furthermore, in the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0022] Please see Figures 1-7 As shown, the present invention provides a pressing device for grain and oil production, including a pressing table 100 and a pressing cage 110 disposed on the pressing table 100; a pressing cover 120 is provided on the top of the pressing cage 110, and pressing mechanisms 200 for applying pressure to the pressing cover 120 are provided on both sides of the pressing table 100; the pressing mechanism 200 includes at least two pull ropes 210 disposed above the pressing cover 120, a winding wheel 220 rotatably disposed on both sides of the pressing table 100 for winding the pull ropes 210, and a worm gear transmission mechanism and a servo motor 230 for driving the winding wheel 220 to rotate; It also includes a pressure detection unit, a displacement detection unit, and a control unit; the pressure detection unit is located in the contact area between the pull rope 210 and the press cover 120, and is used to detect the pressing pressure and output a pressure signal; the displacement detection unit is located on the press cover 120, and is used to detect the downward pressing stroke of the press cover 120 and output a displacement signal to the control unit; the oil output detection unit is located at the oil collection position of the pressing table 100, and is used to detect the oil output or oil output rate and output a flow rate signal to the control unit; the control unit is connected to the pressure detection unit and the servo motor 230, and is used to control the servo motor 230 to start and stop in a jogging manner according to the pressure signal, so that the pressing pressure is maintained within a preset range; It also includes a temperature detection unit, which is located in the oil outlet area of ​​the pressing table 100, and is used to detect the pressing temperature and output a temperature signal to the control unit; and a current detection unit, which is electrically connected to the servo motor 230, and is used to detect the operating current of the servo motor 230 and output a current signal to the control unit.

[0023] The control unit is also used to perform multi-parameter fusion processing based on at least two of the pressure signal, flow signal, oil temperature signal, current signal and displacement signal to dynamically optimize the pressing parameters. During the pressing process, the control unit collects multi-sensor signals in real time, makes comprehensive judgments through the built-in adaptive control algorithm, and dynamically adjusts the preset pressure threshold, motor jogging frequency and pressure holding time control parameters.

[0024] Furthermore, the pressure detection unit includes a first pressure sensor disposed on the top of the press cover 120 and a second pressure sensor disposed on the pull rope 210. The first pressure sensor and the second pressure sensor are respectively connected to the control unit for signal transmission, forming redundant monitoring.

[0025] Furthermore, the top surface of the press cover 120 is provided with a rope support platform 121. The inside of the rope support platform 121 is provided with at least two protective grooves 122 for supporting the pull rope 210 and distributing the pressure evenly. A pulley 211 is provided below the winding wheel 220. The middle part of a pull rope 210 overlaps in the protective groove 122, and its two ends pass under the pulleys 211 on both sides of the press table 100, and then wind around the winding wheel 220 to form a pressure state. The pull rope 210 is smoothly changed direction through the cooperation of the rope support platform 121 and the pulley 211 to avoid damage and improve fatigue resistance.

[0026] Furthermore, to facilitate opening the cage opening and removing the cake mold, the pressing cage 110 is composed of several rods arranged in a ring on the pressing table 100, with a movable rod 111 facing the oil outlet. A top cover is fixedly installed on the top of the pressing cage 110, and a hydraulic cylinder 130 is installed below the top cover for lifting and resetting the pressing cover 120. The movable rod 111 extends and retracts through the top cover, and the bottom end of the movable rod 111 is embedded in a pre-drilled recess in the pressing table 100 to restrict the movable rod 111 during pressing. The pressing cover 120 is stably placed inside the pressing cage 110 by movably engaging with the movable rod 111, so that the pressing cover 120 is limited and stably rises and falls along the pressing cage 110.

[0027] Furthermore, the worm gear transmission mechanism includes a worm wheel 221 coaxially and fixedly connected to the take-up reel 220 and a worm 222 meshing with the worm wheel 221. The worm 222 is connected to the output end of the servo motor 230, which is mounted on the motor base 160. Because the worm wheel 221 and worm 222 have a self-locking characteristic, when the servo motor 230 stops operating, the worm wheel 221 cannot be reversed, thus keeping the take-up reel 220 in its current winding state. The pull rope 210 maintains tension on the press cover 120, and the pressing pressure is maintained without rebound. This is prior art and will not be described further here.

[0028] Furthermore, wheel seats 140, shaft seats 150 and motor seats 160 are fixedly provided on both sides of the pressing table 100 to support the winding wheel 220, worm gear 222 and servo motor 230, so that all equipment can work stably.

[0029] The pressing method for grain and oil production of the present invention is implemented using the above-mentioned pressing apparatus for grain and oil production, and includes the following steps: S1. Stack several cake molds containing grain and oil raw materials in the press cage 110, and cover the upper cake mold with the press cover 120. S2. The pull rope 210 passes over the top of the press cover 120, changes direction through the pulley 211, and is connected to the winding wheel 220; S3. Start the servo motor 230 to drive the worm gear transmission mechanism to drive the winding wheel 220 to rotate and wind up the pulling rope 210, and apply pressure to the pressing cover 120 to press down several cake molds. S4. The pressing pressure is detected in real time by the pressure detection unit set on the press cover 120 and the pull rope 210, and the pressure signal is transmitted to the control unit; the pressing process parameters, including the upper limit of pressure, the lower limit of pressure, the holding time, the temperature range, etc., are set through the human-machine interface, and the pressing program is started. S5. The control unit compares the received pressure signal with the preset pressure threshold. When the pressure value is lower than the preset lower limit, it controls the servo motor 230 to start in jog to continue winding. When the pressure value reaches the preset upper limit, it controls the servo motor 230 to stop running. It uses the self-locking characteristic of the worm gear to maintain the current pressure and maintain pressure and oil discharge for several dies. S6. Repeat steps S4 to S5 until pressing is complete.

[0030] In addition, during the pressing process, the control unit also monitors the pressing temperature in real time through a temperature sensor, the oil output rate in real time through a flow sensor, the pressing stroke of the press cover 120 in real time through a displacement sensor, and the operating current of the servo motor 230 in real time through a current detection unit. The control unit performs multi-parameter fusion judgment based on at least two of the parameters of pressure, temperature, oil output rate, displacement and current, and dynamically adjusts the preset pressure threshold and jog control strategy. When the oil output rate drops below the preset threshold and remains below the preset threshold for a preset time, the control unit determines that the pressing is complete, automatically stops the servo motor 230, and prompts the operator through the human-machine interface.

[0031] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] Example 1: Pressure monitoring and jogging control system; In a preferred embodiment of the present invention, the first pressure sensor is used to directly detect the downward pressure borne by the press cover 120, i.e., the actual pressing pressure borne by the cake mold. The second pressure sensor is used to detect the tension of the pull rope 210, indirectly reflecting the pressing pressure. The first and second pressure sensors are respectively connected to the control unit signal to form redundant monitoring—when one sensor fails or has an abnormal signal, the other sensor can still provide valid pressure data, thereby improving the reliability of the system.

[0033] The control unit uses a PLC controller or a microcontroller, and is connected to the first pressure sensor, the second pressure sensor, and the servo motor 230. The control unit has preset upper and lower pressure limits. During the pressing process, the control unit receives pressure signals from the pressure sensors in real time and compares these signals with the preset upper and lower pressure limits. When the detected pressure value is lower than the preset lower limit, the control unit sends a start signal to the servo motor 230 to drive the servo motor 230 to run. The worm gear transmission mechanism on both sides of the pressing table 100 drives the winding wheel 220 to wind up the pulling rope 210, so that the pressing cover 120 presses down on the cake mold, and the pressing pressure gradually increases. When the detected pressure value reaches the preset upper limit, the control unit sends a stop signal to the servo motor 230, and the servo motor 230 stops running. At this time, due to the self-locking characteristics of the worm gear 221 and worm 222, the winding wheel 220 maintains its current winding position, and the pull rope 210 maintains the tension on the press cover 120, so the pressing pressure is maintained stably. When the pressing pressure gradually drops below the preset lower limit due to factors such as cake mold deformation and oil seepage, the control unit restarts the servo motor 230 to replenish the pressure.

[0034] In this way, the servo motor 230 works intermittently, maintaining the pressing pressure without continuous operation, effectively avoiding the problems of increased energy consumption and shortened lifespan caused by continuous load operation of the motor.

[0035] In addition, the control unit is connected to a human-machine interface, such as a touch screen or button display. Operators can use the human-machine interface to set process parameters such as upper and lower pressure limits and holding time, and view information such as current pressing pressure and operating status in real time.

[0036] Example 2: Temperature monitoring and temperature control function; In another preferred embodiment of the present invention, a temperature detection unit is also included. The temperature detection unit includes a temperature sensor disposed on the oil outlet area of ​​the pressing table 100 and / or the lower surface of the pressing cover 120, for detecting the temperature of the cake mold and the oil outlet during the pressing process and outputting a temperature signal to the control unit.

[0037] In the grain and oil pressing process, temperature is one of the key parameters affecting oil yield and oil quality. Too low a temperature leads to a decrease in oil yield, while too high a temperature can cause quality problems such as oil oxidation and increased acid value. By installing a temperature sensor, the control unit can monitor the pressing temperature in real time and take appropriate measures when the temperature exceeds the preset range. When the temperature exceeds the preset upper limit, the control unit can control the servo motor 230 to stop running or reduce the pressing speed to reduce frictional heat generation; when the temperature is below the preset lower limit, the control unit increases the pressing frequency to increase heat generation.

[0038] Example 3: Oil output monitoring; In another preferred embodiment of the present invention, an oil output detection unit is also included. The oil output detection unit includes a flow sensor disposed at the oil collection position of the pressing table 100, which is used to detect the oil output and / or oil output rate and output a flow signal to the control unit.

[0039] Oil extraction rate is a crucial indicator for judging the pressing process. In the initial stages of pressing, the oil extraction rate is relatively high; as pressing progresses, the rate gradually decreases; when the oil extraction rate stabilizes or falls below a certain threshold, it indicates that pressing is nearing completion and can be automatically stopped. The control unit can make a comprehensive judgment based on the oil extraction rate signal from the flow sensor, combined with the pressure signal, to automatically identify the pressing endpoint and avoid over- or under-pressing.

[0040] Example 4: Stroke / Displacement Monitoring; In another preferred embodiment of the present invention, a displacement detection unit is also included. The displacement detection unit includes a displacement sensor disposed on the press cover 120, which is used to detect the downward stroke of the press cover 120 and output a displacement signal to the control unit.

[0041] By combining pressure and displacement data, the control unit can plot a pressure-displacement curve to determine the degree of compaction and the pressing progress of the cake mold. For example, in the early stages of pressing, a small displacement can cause a large pressure change; while in the later stages of pressing, a large displacement can only cause a small pressure change. By analyzing the pressure-displacement curve, the control unit can more accurately determine the pressing stage and thus dynamically adjust the pressing strategy.

[0042] Example 5: Motor current monitoring; In another preferred embodiment of the present invention, a current detection unit is also included. The current detection unit is electrically connected to the servo motor 230 and is used to detect the operating current of the servo motor 230 and output a current signal to the control unit.

[0043] Motor current can indirectly reflect the load status: a sudden increase in current may indicate material jamming, overload, or mechanical failure, and the control unit can automatically shut down the machine for protection and issue an alarm signal accordingly; a stable current indicates that the pressing process has entered a steady phase. Current detection can serve as an auxiliary and supplementary measure to pressure detection, further improving the safety and reliability of the system.

[0044] Example 6: Multi-parameter adaptive control; In the most preferred embodiment of the present invention, the control unit is also used to perform multi-parameter fusion processing based on at least two of the pressure signal, temperature signal, flow signal, displacement signal and current signal to dynamically optimize the pressing parameters.

[0045] Specifically, the control unit stores a database of pressing processes for different oilseed varieties, such as peanuts, rapeseed, soybeans, and sesame, including recommended pressure ranges, temperature ranges, and holding times for each variety at different pressing stages. During the pressing process, the control unit collects signals from multiple sensors in real time and makes comprehensive judgments through built-in adaptive control algorithms, such as fuzzy control, PID control, or neural network control, to dynamically adjust control parameters such as preset pressure thresholds, jogging frequency, and holding time, thereby achieving intelligent and precise control of the pressing process.

[0046] For example, for peanuts, a higher upper pressure limit and shorter jogging interval can be set in the early stages of pressing to quickly establish pressing pressure; in the middle stages, the upper pressure limit can be appropriately reduced and the holding time extended to fully extract the oil; in the later stages, the pressing endpoint can be automatically determined based on the oil extraction rate signal, and pressing can be stopped. For rapeseed, due to its smaller particle size and higher oil content, relatively mild pressing parameters can be set to avoid over-pressing and resulting in excessively broken cake.

[0047] Furthermore, multi-parameter integrated control, including oil extraction rate and displacement stroke, was introduced, and combined with a worm gear self-locking structure and a jog control strategy, to achieve more comprehensive and precise control of the pressing process.

[0048] Example 7: Safety protection function; As a further preferred embodiment of the present invention, the system also has the following safety protection functions: Overpressure protection: When the pressing pressure detected by the pressure sensor exceeds the preset safety limit, the control unit automatically controls the servo motor 230 to stop running and issues an audible and visual alarm signal through the human-machine interface to prevent equipment damage or safety accidents caused by excessive pressure.

[0049] Anti-pinch protection: When the pressure signal changes abnormally, such as a sudden increase or decrease, the control unit judges that there may be abnormal situations such as foreign objects getting stuck or people getting their hands pinched, and automatically stops the machine for protection.

[0050] Dual redundancy protection: The first pressure sensor and the second pressure sensor form redundant monitoring. When the pressure signal deviation between the two sensors exceeds the preset threshold, the control unit determines that at least one of the sensors has failed, automatically stops the machine and alarms, prompting the operator to check and maintain it.

[0051] Overload protection: The current detection unit monitors the operating current of the servo motor 230 in real time. When the current exceeds the preset safe current value, the control unit automatically cuts off the power supply to the servo motor 230 to prevent the motor from burning out.

[0052] Example 8: System Architecture; The control system of this invention adopts a modular architecture, including: Input module: first pressure sensor, second pressure sensor, temperature sensor, flow sensor, displacement sensor, current detection unit. Each sensor is connected to the corresponding input port of the control unit via signal lines.

[0053] Core control module: The control unit adopts a PLC controller, such as the Siemens S7-1200 series; or a microcontroller controller, such as the STM32 series; the built-in A / D conversion module is used to convert analog sensor signals into digital signals, the built-in storage unit is used to store the process parameter database and control program, and the built-in arithmetic unit is used to execute adaptive control algorithms.

[0054] Output module: includes the drive circuit of servo motor 230, such as frequency converter or motor driver, sound and light alarm, human-machine interface, etc.

[0055] Communication module: The control unit can also connect to the host computer or cloud platform via wired or wireless communication modules, such as RS485, Ethernet, Wi-Fi, 4G / 5G, etc., to realize remote monitoring, data recording and fault diagnosis functions.

[0056] It should be noted that the terms "fixed connection" and "fixed installation" in this invention should be interpreted broadly, and can be achieved using conventional fixing methods such as bolt connection, welding, bonding, or integral molding that are compatible with each other. The specific connection relationship between the components is based on the ability to achieve the function of this invention. The above are existing technologies and will not be elaborated further here. The above embodiments are only for illustrating the technical concept and features of this invention, and their purpose is to enable those skilled in the art to understand the content of this invention and implement it accordingly. They should not be used to limit the scope of protection of this invention. All equivalent changes or modifications made according to the spirit and essence of this invention should be covered within the scope of protection of this invention.

Claims

1. A pressing device for grain and oil production, comprising a pressing table and a pressing cage disposed on the pressing table; characterized in that: The press cage is covered with a press cover, and the pressing platform is provided with pressing mechanisms for applying pressure to the press cover on both sides; the pressing mechanism includes at least two pull ropes provided above the press cover, a winding wheel rotatably provided on both sides of the pressing platform for winding the pull ropes, and a worm gear transmission mechanism and a servo motor for driving the winding wheel to rotate. It also includes a pressure detection unit, a displacement detection unit, and a control unit; the pressure detection unit is located in the contact area between the pull rope and the press cover, and is used to detect the pressing pressure and output a pressure signal; the displacement detection unit is located on the press cover, and is used to detect the downward stroke of the press cover and output a displacement signal to the control unit; the oil output detection unit is located at the oil collection position of the pressing table, and is used to detect the oil output or oil output rate and output a flow rate signal to the control unit; the control unit is signal-connected to the pressure detection unit and the servo motor, and is used to control the servo motor to start and stop in a jogging manner according to the pressure signal, so as to maintain the pressing pressure within a preset range; The control unit is also used to perform multi-parameter fusion processing based on at least two of the pressure signal, flow signal and displacement signal to dynamically optimize the pressing parameters. During the pressing process, the control unit collects multiple sensor signals in real time, makes comprehensive judgments through the built-in adaptive control algorithm, and dynamically adjusts the preset pressure threshold, motor jogging frequency and pressure holding time control parameters.

2. The pressing device for grain and oil production according to claim 1, characterized in that: The pressure detection unit includes a first pressure sensor disposed on the top of the press cover and a second pressure sensor disposed on the pull rope. The first pressure sensor and the second pressure sensor are respectively connected to the control unit to form redundant monitoring.

3. The pressing device for grain and oil production according to claim 2, characterized in that: It also includes a temperature detection unit, which is located in the oil outlet area of ​​the pressing table and is used to detect the pressing temperature and output a temperature signal to the control unit.

4. The pressing device for grain and oil production according to claim 3, characterized in that: It also includes a current detection unit, which is electrically connected to the servo motor and is used to detect the operating current of the servo motor and output a current signal to the control unit.

5. The pressing device for grain and oil production according to claim 4, characterized in that: The top surface of the press cover is provided with a rope support platform. The inside of the rope support platform is provided with at least two protective grooves for placing the pull rope. A pulley is provided below the winding wheel. The middle part of one of the pull ropes is connected in the protective groove, and its two ends pass under the pulleys on both sides of the press table and then go around to the winding wheel to form a pressure state.

6. The pressing apparatus for grain and oil production according to claim 5, characterized in that: The pressing cage is composed of several columns arranged in a ring on the pressing table. A movable rod is provided facing the oil outlet to open the cage opening and remove the cake mold. A top cover is fixedly provided on the top of the pressing cage, and a hydraulic cylinder is installed below the top cover to lift the pressing cover and reset it.

7. The pressing apparatus for grain and oil production according to claim 6, characterized in that: The worm gear transmission mechanism includes a worm gear fixedly connected coaxially to the winding reel and a worm meshing with the worm gear, the worm being drivenly connected to the output end of the servo motor.

8. The pressing apparatus for grain and oil production according to claim 7, characterized in that: Wheel seats, shaft seats, and motor seats are fixedly installed on both sides of the pressing table to support the winding wheel, worm gear, and servo motor respectively.

9. The pressing apparatus for grain and oil production according to claim 8, characterized in that: The press cover is stably placed inside the press cage by being movably sleeved with the movable rod.

10. A pressing method for grain and oil production, implemented using the pressing apparatus for grain and oil production as described in claim 9, characterized in that, Includes the following steps: S1. Stack several cake molds containing grain and oil raw materials in the press cage, and cover the upper cake mold with the press cover. S2. The pull rope passes over the top of the press cover, changes direction via the pulley, and connects to the take-up wheel; S3. Start the servo motor to drive the worm gear transmission mechanism to rotate the winding wheel and wind up the pulling rope, and apply pressure to the pressing cover to press down several cake molds; S4. The pressing pressure is detected in real time by the pressure detection unit set on the press cover and the pull rope, and the pressure signal is transmitted to the control unit. S5. The control unit compares the received pressure signal with the preset pressure threshold. When the pressure value is lower than the preset lower limit, it controls the servo motor to start inching to continue winding. When the pressure value reaches the preset upper limit, it controls the servo motor to stop running and uses the self-locking characteristic of the worm gear to maintain the current pressure and maintain pressure for oil discharge of several dies. S6. Repeat steps S4 to S5 until pressing is complete.

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