Oil press with precise control of barrel temperature

Abstract

The utility model relates to oil press technical field, concretely is a kind of oil press with bore temperature accurate control function, including press bore body, press ring and press screw, press ring is fixedly arranged in press bore body, rotatable press screw is arranged in press ring, further including heating device, temperature measuring element and PLC controller, heating device is detachably installed in the outside of press ring, heating device includes front heating device and rear heating device respectively arranged in the front and rear of press ring, temperature measuring element is respectively arranged in the middle and rear part of press bore body, heating device and temperature measuring element are electrically connected with PLC controller. The oil press with bore temperature accurate control function effectively solves the temperature distribution uneven, poor stability, installation maintenance complex and difficult to realize partition temperature control and other problems existing in the temperature control of traditional oil press, realizes the real-time monitoring and accurate regulation of press bore temperature, improves the pressing efficiency and oil quality, and simplifies the disassembly and repair process.

Description

Technical Field

[0001] This utility model relates to the field of oil press technology, specifically to an oil press with precise chamber temperature control function. Background Technology

[0002] In the oil pressing process, the temperature of the pressing chamber is one of the key factors affecting the oil extraction rate and quality. Traditional oil presses rely on outdated methods for controlling the pressing chamber temperature, often depending on the operator's experience or using simple heating devices. This approach has several drawbacks. Firstly, it's difficult to ensure uniform temperature distribution within the pressing chamber, leading to localized overheating or underheating, resulting in low oil extraction rates. Secondly, the unstable temperature causes significant fluctuations in oil quality, impacting the product's market competitiveness.

[0003] On the other hand, existing heating methods, such as resistance heating, are relatively complex to install and maintain. Resistance heating devices usually require complex wiring connections and fixed structures. Once a fault occurs, repairs are difficult and time-consuming, increasing equipment downtime and maintenance costs. In addition, traditional heating methods are difficult to achieve zoned temperature control of different areas of the pressing chamber and cannot accurately adjust the temperature according to different stages of the pressing process, further limiting the improvement of oil extraction efficiency and oil quality.

[0004] Therefore, in order to overcome the shortcomings of traditional oil presses in terms of pressing chamber temperature control, there is an urgent need for a pressing chamber heating control scheme that is simple in structure, precise in temperature control, and easy to maintain, so as to improve the efficiency of oil pressing production and product quality. Utility Model Content

[0005] To address the aforementioned issues, this utility model provides an oil press with precise chamber temperature control. This oil press effectively solves the problems of uneven temperature distribution, poor stability, complex installation and maintenance, and difficulty in achieving zoned temperature control in traditional oil presses. It enables real-time monitoring and precise adjustment of the chamber temperature, improving pressing efficiency and oil quality, while simplifying the disassembly and maintenance process.

[0006] The technical solution of this utility model is as follows:

[0007] An oil press with precise chamber temperature control includes a pressing chamber body, a pressing ring, and a pressing screw. The pressing ring is fixedly installed inside the pressing chamber body, and a rotatable pressing screw is installed inside the pressing ring. The press also includes a heating device, a temperature measuring element, and a PLC controller. The heating device is detachably installed on the outside of the pressing ring. The heating device includes a front heating device and a rear heating device installed at the front and rear of the pressing ring, respectively. Temperature measuring elements are installed in the middle and rear of the pressing chamber body, respectively. The heating device and the temperature measuring element are electrically connected to the PLC controller.

[0008] The heating device is an electromagnetic heating coil, including a front electromagnetic heating coil and a rear electromagnetic heating coil.

[0009] The front electromagnetic heating coil includes a front upper electromagnetic heating coil and a front lower electromagnetic heating coil, and the rear electromagnetic heating coil includes a rear upper electromagnetic heating coil and a rear lower electromagnetic heating coil.

[0010] The electromagnetic heating coil is mounted on the outside of the press ring via a detachable clip.

[0011] The buckle consists of a U-shaped plate that matches the shape of the electromagnetic heating coil and fixing feet on both sides of the U-shaped plate. The fixing feet are fixedly connected to the outside of the pressing ring by screws.

[0012] Insulating cotton is placed between the electromagnetic heating coil and the pressing ring.

[0013] The temperature measuring element is a temperature sensor. A middle temperature measuring hole and a rear temperature measuring hole are respectively provided in the middle and rear parts of the pressing chamber body, and a temperature sensor is installed in the middle temperature measuring hole and the rear temperature measuring hole respectively.

[0014] The diameter of the middle and rear temperature measuring holes is 6-10mm.

[0015] The temperature sensor is a PT100 platinum resistance temperature sensor.

[0016] The electromagnetic induction frequency of the electromagnetic heating coil is 2KHz-20KHz.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. This utility model discloses an oil press with precise chamber temperature control. This oil press improves the pressing effect through precise temperature control. The front and rear and top and bottom grouped electromagnetic coil design can be disassembled and maintained individually, reducing maintenance costs. Temperature measuring elements are set in the middle and rear of the pressing chamber to achieve full temperature coverage of key areas of the pressing chamber, avoiding local overheating or insufficient temperature. The PLC controller receives the signal from the temperature measuring element and adjusts the output power of the heating device according to the preset process curve to achieve a temperature difference accuracy of ±1℃, ensuring temperature stability during the pressing process, increasing the oil extraction rate by 10-15%, and improving pressing efficiency and oil quality.

[0019] 2. The present invention discloses an oil press with precise chamber temperature control function. The heating device of the oil press with precise chamber temperature control function is installed on the outside of the pressing ring by a detachable buckle, which facilitates the installation, disassembly and maintenance of the heating device and reduces maintenance costs. Heat insulation cotton is filled between the electromagnetic heating coil and the pressing ring, which can effectively prevent heat from spreading to non-target areas.

[0020] 3. This utility model discloses an oil press with precise chamber temperature control function. The oil press with precise chamber temperature control function has a middle temperature measuring hole and a rear temperature measuring hole respectively set in the middle and rear parts of the pressing chamber body, providing a stable installation position for the temperature sensor and ensuring the accuracy of temperature measurement; it adopts a PT100 platinum resistance temperature sensor, which has the advantages of high accuracy and good stability, and can accurately measure the temperature of the pressing chamber, providing a reliable temperature signal for the PLC controller and ensuring the normal operation of the temperature control system.

[0021] 4. The present invention discloses an oil press with precise chamber temperature control function. The electromagnetic induction of the oil press with precise chamber temperature control function is mainly based on medium and high frequency (2KHz-20KHz) to avoid excessive heat conversion of the pressing chamber body that does not need to be heated by low frequency. Attached Figure Description

[0022] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0023] In the attached diagram:

[0024] Figure 1 This is a front sectional view of an oil press with precise chamber temperature control according to an embodiment of the present invention.

[0025] Figure 2 This is a top sectional view (pressing ring not sectionalized) of an oil press with precise chamber temperature control according to an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the buckle for fixing the electromagnetic heating coil used in an oil press with precise chamber temperature control function according to an embodiment of the present utility model.

[0027] The components represented by the various reference numerals in the diagram are:

[0028] This utility model comprises: 1. Press chamber body, 2. Press ring, 3. Front upper electromagnetic heating coil, 4. Front lower electromagnetic heating coil, 5. Rear upper electromagnetic heating coil, 6. Rear lower electromagnetic heating coil, 7. Middle temperature measuring hole, 8. Rear temperature measuring hole, 9. PLC controller, 10. Press screw, 11. Oil collecting hopper, 12. Filter screen, 13. Temperature sensor. Detailed Implementation

[0029] This oil press with precise chamber temperature control is a partial improvement on existing oil presses. The original oil press consisted of a pressing chamber body 1, a pressing ring 2, and a screw press 10. The pressing ring 2 was manufactured using forged steel to ensure high strength to withstand mechanical stress during the pressing process. The pressing chamber body 1 was made of cast iron to reduce heat loss to non-heated areas during electromagnetic heating. The pressing ring 2 was fixedly installed inside the pressing chamber body 1, and the screw press 10 was rotatably installed inside the pressing ring 2. An oil collecting hopper 11 was located at the bottom of the pressing chamber body 1, and a filter screen 12 was installed inside the oil collecting hopper 11. Other structures less relevant to the improvements of this utility model are not described in detail. For specific details, please refer to publicly available technical information on oil presses, such as the Chinese utility model patent with authorization announcement number "CN214354374U" entitled "A Screw Oil Press for Flaxseed Oil Adsorption Refining". A screw oil press for flaxseed oil adsorption refining includes a support base, a pressing cylinder fixed between the support bases, a feed cylinder vertically fixed to the upper end of the pressing cylinder and communicating with it, multiple tightly fitted pressing rings arranged axially inside the pressing cylinder, a screw shaft rotatably connected to the pressing rings, pressing screw blades integrally formed thereon wound around the screw shaft, a rotating shaft welded to the screw shaft, a drive mechanism at the lower end of the pressing cylinder, a transmission mechanism matching the feed cylinder fixed to the top of the support base, the drive mechanism being connected to the transmission mechanism and the rotating shaft respectively via a transmission belt, a screw blade vertically arranged inside the feed cylinder and meshing with the transmission mechanism via bevel teeth, a top plate threaded to the side end of the pressing cylinder, a top rod for pressing the pressing rings on the top plate, the tightness of the pressing rings can be adjusted flexibly, conveniently, quickly and efficiently, the crushing cage reduces the occurrence of outlet blockage, ensuring pressing efficiency and improving oil quality.

[0030] This oil press with precise chamber temperature control mainly improves the chamber temperature control of oil presses. It is of great significance for precise temperature control of tea seeds. Tea seeds contain a lot of saponins, which combine with water to form a viscous substance, affecting the extraction of tea oil. When the chamber temperature is stably and precisely controlled at around 120 degrees Celsius, the saponins can be denatured, which is conducive to the extraction of tea oil and increases economic benefits.

[0031] This oil press, which features precise chamber temperature control, employs a heating principle similar to that of an induction cooker, achieving near-stepless control. The electromagnetic coil acts directly on the press ring, resulting in direct heating, rapid thermal conductivity, and precise temperature control.

[0032] Specifically, such as Figure 1 and Figure 2As shown, this oil press with precise chamber temperature control also includes an electromagnetic heating device, a temperature measuring element, and a PLC controller, in addition to existing technologies. The electromagnetic heating device uses four independent electromagnetic heating coils, including a front upper electromagnetic heating coil 3, a front lower electromagnetic heating coil 4, a rear upper electromagnetic heating coil 5, and a rear lower electromagnetic heating coil 6. The coils are filled with heat-insulating cotton between themselves and the pressing ring 2. The temperature measuring element consists of a PT100 platinum resistance temperature sensor 13 in the middle temperature measuring hole 7 and the rear temperature measuring hole 8. The sensor probe is attached to the inner wall of the pressing chamber through thermally conductive silicone grease to ensure accurate acquisition of temperature signals. The PLC controller 9 is an S7-200 SMART model, which realizes closed-loop temperature control and abnormal alarm functions.

[0033] Four sets of electromagnetic heating coils are fixed to the outer wall of the pressing ring 2 via a snap-fit ​​structure; as shown Figure 3 As shown, the buckle consists of a U-shaped plate and two fixing feet on both sides. The fixing feet are connected to the outside of the pressing ring 2 by screws to achieve quick assembly and disassembly. The gap between the coil and the pressing ring 2 is filled with heat insulation cotton to prevent heat from being lost to the outside.

[0034] Based on the differences in electromagnetic properties between forged steel and cast iron, the electromagnetic induction frequency of the electromagnetic heating coil is set to 2kHz-20kHz. Forged steel (pressing ring 2) requires a higher frequency to achieve a reasonable penetration depth due to its high electrical conductivity and high magnetic permeability; cast iron (pressing chamber body 1) requires a lower frequency to avoid overheating of non-heated areas due to its low electrical conductivity and low magnetic permeability. This frequency range ensures efficient heating of pressing ring 2 while reducing ineffective heat transfer in pressing chamber body 1.

[0035] The following is a detailed analysis of the effects of electromagnetic heating on materials:

[0036] Induction heating relies on alternating magnetic fields to induce eddy currents inside conductive materials to generate heat. The eddy currents are mainly concentrated near the surface of the material, and their intensity decreases exponentially with increasing depth.

[0037] Penetration depth refers to the depth at which the eddy current density drops to approximately 37% of the surface value.

[0038] Penetration depth formula:

[0039]

[0040] In the formula: Penetration depth, unit: m;

[0041] The resistivity of the material, in units of: ;

[0042] Current frequency, unit: Hz;

[0043] Permeability, in H / m.

[0044] ,

[0045] • is the vacuum permeability.

[0046] Relative permeability;

[0047] Forged steel has high electrical conductivity and low resistivity. The resistivity of pure iron is relatively low; while the resistivity of steel increases slightly with alloy composition, it remains significantly lower than that of cast iron. Its magnetic permeability is also relatively high; in its magnetic state below the Curie point (approximately 760°C), its relative permeability is... The temperature is very high (up to several hundred), and it becomes paramagnetic after exceeding the Curie point. ≈ 1.

[0048] Cast iron (especially gray cast iron) has low electrical conductivity and low resistivity. The resistivity is very high, mainly due to the presence of a large amount of free graphite (especially flake graphite) in cast iron. Graphite is a good conductor, but it disrupts the continuity of the metal matrix, leading to a significant increase in overall resistivity. The resistivity of gray cast iron is typically several times higher than that of carbon steel. The magnetic permeability is also low; in its magnetic state, the relative permeability is... Generally lower than that of forged steel, the presence of free graphite also reduces the overall magnetic permeability of the material.

[0049] Forged steel Small value and High, according to the penetration depth formula, can be derived The value is relatively small, in order to achieve a reasonable and practical penetration depth. (Neither too shallow, leading to surface overheating, nor too deep, resulting in low efficiency), a higher frequency is needed. To compensate.

[0050] cast iron Large value and Low, which can be derived from the penetration depth formula. The value is relatively large, even when using a lower frequency. It can also achieve a penetration depth similar to that of forged steel at higher frequencies. Excessive frequency may lead to shallow penetration, with heat concentrated on the outermost layer, which is not conducive to overall heating or may easily cause surface overheating or even melting (especially for graphite-containing cast iron).

[0051] In summary, the electromagnetic induction of the press mainly uses medium and high frequencies (2KHz-20KHz) to avoid excessive heat conversion of the cast iron press chamber body, which does not need to be heated, by low frequencies.

[0052] The central temperature measuring hole 7 is located in the middle of the pressing chamber (1 / 2 of the pressing chamber length from the feed inlet), and the rear temperature measuring hole 8 is located at the rear of the pressing chamber (10cm from the discharge outlet). Both holes have a diameter of 8mm. The PT100 temperature sensor 13 (model PT100-BA grade) is installed inside the temperature measuring hole. The probe is in close contact with the inner wall of the pressing chamber through thermally conductive silicone grease to eliminate the influence of air gaps on the temperature measurement accuracy.

[0053] The PT100 temperature sensor 13 converts the temperature signal into a change in resistance value, which is then converted into a 4-20mA current signal by the temperature sensor converter and transmitted to the analog input module of the PLC controller 9. The PLC controller 9 processes the signal according to the preset process curve (such as the target temperature of 120℃).

[0054] The working process and control logic of the oil press with precise chamber temperature control:

[0055] 1. Initialization and target temperature setting:

[0056] When the oil press is started, the PLC controller 9 initializes the target temperature to 120℃ and checks the connection status of the electromagnetic heating coil and the PT100 temperature sensor 13. If an abnormality is detected (such as a sensor open circuit), a buzzer alarm is triggered and the heating power is cut off.

[0057] 2. Real-time temperature acquisition and PID control:

[0058] Data acquisition: The PT100 temperature sensor 13 acquires the temperature signals of the middle and rear sections at a 1-second cycle and transmits them to the PLC controller 9.

[0059] PID control algorithm: The PLC controller 9 uses a PID algorithm to compare the measured temperature with the target value and dynamically adjust the output power of the electromagnetic heating coil.

[0060] Feeding section preheating: When the temperature in the middle section is lower than the target value, the power of the upper front electromagnetic heating coil 3 and the lower front electromagnetic heating coil 4 is increased first to ensure that the material reaches a suitable temperature before entering the pressing section.

[0061] Temperature control in the pressing section: When the temperature in the rear section exceeds the target value, the power of the upper rear electromagnetic heating coil 5 and the lower rear electromagnetic heating coil 6 is reduced to prevent the oil from deteriorating in quality due to high-temperature oxidation.

[0062] 3. Abnormal handling and safety protection:

[0063] Temperature difference alarm: If the temperature difference between the middle and rear parts exceeds 5°C for 10 seconds, the PLC controller 9 will trigger a buzzer alarm and display a fault code (such as E-01 indicating abnormal temperature) on the human-machine interface.

[0064] Emergency shutdown: When the temperature exceeds the safety threshold (e.g., 150℃), the PLC controller 9 immediately cuts off the power to all electromagnetic heating coils and starts the cooling fan to accelerate the cooling of the pressing chamber.

[0065] This oil press with precise chamber temperature control achieves precise control of the chamber temperature through dual-point temperature measurement (middle + rear) and PLC closed-loop control. In actual testing, the temperature fluctuation range of the pressing chamber is controlled within ±1℃, meeting the temperature stability requirements of the pressing process. Through the synergistic effect of electromagnetic heating and intelligent temperature feedback, precise control of the pressing chamber temperature is achieved, solving the problems of uneven temperature distribution and poor stability in traditional oil presses. It is suitable for the efficient operation of small and medium-sized oil pressing equipment.

Claims

1. An oil press with precise chamber temperature control function, comprising a pressing chamber body (1), a pressing ring (2), and a pressing screw (10), wherein the pressing ring (2) is fixedly disposed within the pressing chamber body (1), and a rotatable pressing screw (10) is disposed within the pressing ring (2), characterized in that, It also includes a heating device, a temperature measuring element and a PLC controller (9). The heating device is detachably installed on the outside of the pressing ring (2). The heating device includes a front heating device and a rear heating device set at the front and rear of the pressing ring (2). Temperature measuring elements are set in the middle and rear of the pressing chamber body (1). The heating device and the temperature measuring element are electrically connected to the PLC controller (9).

2. The oil press with precise chamber temperature control function according to claim 1, characterized in that, The heating device is an electromagnetic heating coil, including a front electromagnetic heating coil and a rear electromagnetic heating coil.

3. An oil press with precise chamber temperature control function according to claim 2, characterized in that, The front electromagnetic heating coil includes a front upper electromagnetic heating coil (3) and a front lower electromagnetic heating coil (4), and the rear electromagnetic heating coil includes a rear upper electromagnetic heating coil (5) and a rear lower electromagnetic heating coil (6).

4. An oil press with precise chamber temperature control function according to claim 2, characterized in that, The electromagnetic heating coil is installed on the outside of the press ring (2) by a detachable buckle.

5. An oil press with precise chamber temperature control function according to claim 4, characterized in that, The buckle consists of a U-shaped plate that matches the shape of the electromagnetic heating coil and fixing feet on both sides of the U-shaped plate. The fixing feet are fixedly connected to the outside of the pressing ring (2) by screws.

6. An oil press with precise chamber temperature control function according to claim 2, characterized in that, Insulating cotton is placed between the electromagnetic heating coil and the pressing ring (2).

7. An oil press with precise chamber temperature control function according to claim 1, characterized in that, The temperature measuring element is a temperature sensor (13). A middle temperature measuring hole (7) and a rear temperature measuring hole (8) are respectively provided in the middle and rear parts of the pressing chamber body (1). A temperature sensor (13) is installed in the middle temperature measuring hole (7) and the rear temperature measuring hole (8).

8. An oil press with precise chamber temperature control function according to claim 7, characterized in that, The diameters of the middle temperature measuring hole (7) and the rear temperature measuring hole (8) are 6-10 mm.

9. An oil press with precise chamber temperature control function according to claim 7, characterized in that, The temperature sensor (13) is a PT100 platinum resistance temperature sensor.

10. An oil press with precise chamber temperature control function according to claim 2, characterized in that, The electromagnetic induction frequency of the electromagnetic heating coil is 2KHz-20KHz.

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