An intelligent low-temperature screw oil press with a pressure monitoring device

Abstract

The present invention relates to an intelligent low-temperature screw oil press with a pressure monitoring device, including a screw oil press, which includes a frame, a pressing screw shaft is arranged in the pressing chamber of the frame, and is connected to a motor through a reducer; a pressing cage is arranged on the pressing screw shaft, and a plurality of oil filtering sections are arranged thereon; it also includes a pressure monitoring unit, a temperature monitoring unit, a cooling unit and an automatic control system; the pressure monitoring unit is arranged in each oil filtering section of the pressing cage, and the pressure data of each oil filtering section is monitored in real time; the automatic control system controls and adjusts the feeding speed and the main shaft speed according to the received pressure data; the temperature monitoring unit is used to monitor the temperature data of different positions in the pressing chamber and send it to the automatic control system; the cooling unit is used to ensure that the pressing chamber is in a low temperature environment according to the control signal sent by the automatic control system. The present invention can be widely used in the field of oil presses.

Description

Technical Field

[0001] The invention relates to a screw oil press, in particular to an intelligent low-temperature screw oil press with a pressure monitoring device. Background Art

[0002] The spiral low-temperature oil press has significant advantages such as small footprint, simple operation, continuous production, less pollution and good oil quality. It is often used to extract oil from vegetable oil.

[0003] Low-temperature screw pressing requires different spiral structures to be designed for different oils. Since the oil press has a pressure monitoring function, it is possible to try to use the equipment to press various oils, explore the spiral structure parameters that are most suitable for low-temperature pressing and the standard curve of the pressing pressure distribution under these parameters. During the pressing test, the function of collecting the pressure in the pressing chamber can be used to explore the effects of parameters such as material moisture content, pressing temperature, spiral structure, and compression ratio on the pressing chamber pressure and oil yield. Recording the test parameters can establish the pressing parameter equations for different oils, improve the empirical formula of the screw oil press, and use it to quickly select the appropriate spiral combination, bar gap and other structural parameters for oils with different moisture and oil contents. It can guide the development of new oil presses and the production practice of oil press workshops.

[0004] In the actual use of the screw oil press, workers need to observe the operation of the oil press to avoid problems such as "serious slag", "slippery bore", and "stuck car". In addition, operators still need to regularly open the press cage to check the surface wear of the screw and whether there are problems such as screw tooth breakage. However, relying solely on operators to regularly open the press cage to check the operation of the oil press not only consumes a lot of manpower, but also cannot guarantee timely detection of the operation of the oil press. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide an intelligent low-temperature screw oil press with a pressure monitoring device, which can automatically collect the pressure changes in the oil press chamber in real time and automatically control the oil press according to the collected pressure data.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an intelligent low-temperature screw oil press with a pressure monitoring device, which includes a screw oil press, the screw oil press includes a frame, a pressing cage, a pressing screw shaft, a feeding device, a reducer and a motor, the pressing screw shaft is arranged in a pressing chamber of the frame, and the pressing screw shaft is electrically connected to the motor through the reducer; the pressing cage is sleeved on the pressing screw shaft, and the pressing cage is provided with a plurality of oil filtering sections separated by partitions; it also includes a pressure monitoring unit, a temperature monitoring unit, a cooling unit and an automatic control system; the pressure monitoring unit is arranged in each oil filtering section of the pressing cage, and is used to monitor the pressure data of each oil filtering section in real time and send it to the automatic control system; the automatic control system controls and adjusts the feeding speed and the main shaft speed according to the received pressure data; the temperature monitoring unit is used to monitor the temperature data of different positions in the pressing chamber and send it to the automatic control system; the cooling unit is used to ensure that the pressing chamber is in a low temperature environment not higher than 70°C according to the control signal sent by the automatic control system.

[0007] Furthermore, the automatic control system includes a data acquisition unit, a processing and display unit and a central controller; the data acquisition unit is connected to each of the pressure monitoring units to collect the pressure data monitored by each of the pressure monitoring units; the processing and display unit is used to process the pressure data collected by the data acquisition unit and send it to the central controller; the central controller includes a pressure control unit and a temperature control unit, the pressure control unit is used to compare the collected pressure value in the pressing chamber with the pre-stored standard working curve, and adjust the feeding screw speed and the pressing screw speed through the network communication interface according to the comparison result; the temperature control unit is respectively connected to the temperature monitoring unit and the cooling unit, and is used to analyze the bursting temperature distribution according to the temperature at different positions of the bursting chamber collected by the temperature monitoring unit, and control the cooling water flow of the cooling unit according to the analysis result, so as to achieve the purpose of making the bursting temperature not higher than 70°C.

[0008] Furthermore, the data acquisition unit includes a multi-channel signal conditioning module and an excitation power supply, the multi-channel signal conditioning module is used to convert the resistance signal monitored by each pressure monitoring unit into a current signal, and the excitation power supply is used to supply power and amplify the current signal at the same time.

[0009] Furthermore, at least one pressure monitoring unit is provided on each of the oil filtering sections.

[0010] Furthermore, each oil filtering section of the pressing cage includes a plurality of first pressing bars and a second pressing bar, the second pressing bar is arranged in the middle of the side surface of the pressing cage, and a threaded hole for installing the pressure monitoring unit is opened on the second pressing bar.

[0011] Furthermore, the pressure monitoring unit includes a strain gauge sensor and a melt pressure sensor; the strain gauge sensor is installed on at least one of the first pressing bars in each oil filtering section, and the melt pressure sensor is detachably installed on the second pressing bar through a threaded hole opened on the second pressing bar and having a size matching that of the melt pressure sensor detection head, and each of the strain gauge sensor and melt pressure sensor is connected to the data acquisition unit in the automatic control system through a wire; the strain gauge sensor is used to monitor the real-time changes in the pressure in the pressing chamber for a long time, and the melt pressure sensor is used to regularly calibrate the strain gauge sensor.

[0012] Furthermore, when each of the pressure monitoring units is connected to the automatic control system, the strain gauge sensor cooperates with the temperature compensation strain gauge and two resistors to form a half-bridge wiring.

[0013] Furthermore, the temperature compensation strain gauge is adhered to the outer surface of the third pressing bar, and the third pressing bar is independently placed outside the pressing cage and keeps in contact with the corresponding oil filtering section of the pressing cage, so that its temperature is the same as that of the first pressing bar in the corresponding oil filtering section in the pressing chamber.

[0014] Furthermore, the temperature monitoring unit includes at least three metal temperature sensors attached to the pressing section and the discharging section of the pressing cage, which are used to collect temperature data at different positions of the pressing chamber and send them to the automatic control system.

[0015] Furthermore, the cooling unit includes a water inlet and a water outlet arranged on the end shield of the squeezing screw shaft at the cake outlet end, wherein the water inlet is connected to the hollow main shaft of the squeezing screw shaft through a slender water pipe, and the water outlet is connected to a circulating water tank; the water inlet and the water outlet are respectively provided with a water inlet valve and a water outlet valve, and the water inlet valve and the water outlet valve are both connected to the automatic control system and controlled by the automatic control system.

[0016] Due to the adoption of the above technical scheme, the present invention has the following advantages: 1. The pressure monitoring unit of the present invention can directly measure the radial pressure of the pressing chamber, which can avoid the influence of the material and structural changes of the pressing bars or pressing rings of various types of equipment and the interference of complex stress conditions during operation, and has good versatility and reliability; 2. The present invention is provided with a temperature monitoring unit and a cooling unit, which can avoid the influence of adverse factors such as high temperature, high oil, and strong friction in the pressing chamber on the working conditions of the pressure sensor, and can obtain higher durability and stability; 3. The present invention has a simple structure and a wide range of applications; it can realize the continuous characterization of the radial pressure dynamics of the pressing chamber, and provide a reliable basis for the structural improvement and operation optimization of the screw oil press. Therefore, the present invention can be widely used in the field of oil presses. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like parts throughout the exemplary embodiments of the present invention.

[0018] Figure 1 A schematic diagram of an intelligent low-temperature screw oil press with a pressure monitoring device according to an exemplary embodiment of the present invention;

[0019] Figure 2 The strain gauge of the pressure monitoring unit of the present invention is connected to the signal conditioning module;

[0020] Figure 3 According to the present invention, a second pressing bar with threaded holes is installed in the pressing cage;

[0021] Figure 4 This is a schematic diagram of the second pressing bar opening of the present invention;

[0022] Figure 5 It is a simple logic block diagram of the pressure control unit and the temperature control unit of the present invention;

[0023] Figure 6 It is a schematic diagram of the structure of the cooling component of the present invention;

[0024] Figure 7 The maximum pressure value per minute monitored by the sensor taking the fourth-gear press bar gap as an example in the present invention;

[0025] Figure 8 The pressure distribution after the pressure in the pressing chamber of the present invention is stabilized;

[0026] The marks in the figure are as follows: 1. Frame; 2. Pressing cage; 3. Partition; 4. Melt pressure sensor; 5. Feeding device; 6. Feeding motor stop button; 7. Feeding motor start button; 8. Automatic control system; 81. Signal conditioning module; 82. Excitation power supply; 83. Central controller; 9. Main motor stop button; 10. Main motor start button; 11. Reducer; 12. Motor; 13. Strain gauge sensor; 131. Temperature compensation strain gauge; 132. Resistor; 133. Resistor; 14. First pressing bar; 140. Pressing plate; 15. Pressing screw shaft; 16. Water outlet; 17. Water inlet; 18. Cooling device; 180. Hollow main shaft; 19. Second pressing bar; 20. Pressing chamber temperature sensor. DETAILED DESCRIPTION

[0027] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0028] After analysis, the present invention finds that the common problems in the prior art that are monitored by manpower can all be manifested as abnormal changes in the pressure in the pressing chamber. At the same time, the pressure changes in the pressing chamber can also be used to measure the pressing effect of the screw oil press. Therefore, the present invention determines whether the screw oil press is working normally and predicts the oil pressing efficiency by designing a real-time pressure collection system in the pressing chamber. In addition, a control function is added to the oil press, and the collection function is upgraded to a pressure-based oil press automatic control system in combination with the pressure and temperature monitoring in the pressing chamber of the oil press. When the equipment is used in conjunction with the automatic control system, the real-time pressure distribution in the pressing chamber can be compared with the pressure curve under the standard working conditions. PLC is used to control parameters such as cooling water flow rate, feeding speed, and spindle speed, so as to better control the pressure and temperature in the pressing chamber. Or, operation problems such as "slag", "slippery chamber", and "stuffy car" can be discovered in time through pressure anomalies to reduce the labor intensity of operators.

[0029] like Figure 1 As shown, the present invention proposes an intelligent low-temperature screw oil press with a pressure monitoring device, which includes an existing screw oil press, a plurality of pressure monitoring units, a temperature monitoring unit, a cooling unit and an automatic control system. Specifically, the screw oil press includes a frame 1, a pressing cage 2, a pressing screw shaft 15, a feeding device 5, a reducer 11 and a motor 12. The pressing screw shaft 15 is arranged in a pressing chamber of the frame 1, and the pressing screw shaft 15 is electrically connected to the motor 12 through the reducer 11; the pressing cage 2 is sleeved on the pressing screw shaft 15, and the pressing cage 2 is provided with a plurality of oil filtering sections separated by partitions 3; the pressure monitoring unit is arranged in each oil filtering section of the pressing cage 2, and is used for real-time monitoring of the pressure data of each oil filtering section, and sending it to the automatic control system; the temperature monitoring unit is used for monitoring the temperature data of different positions in the pressing chamber, and sending it to the automatic control system; the cooling unit is used for ensuring that the pressing chamber is in a low temperature environment of not more than 70°C according to the control signal sent by the automatic control system; after receiving the pressure data, the automatic control system improves the performance of the oil press by adjusting the feeding speed and the main shaft speed and other measures, and improves the oil yield and production volume of the screw oil press when pressing different oils, and can also timely feedback the wear of the parts such as the pressing screw shaft, thereby reducing the operating cost of the oil press.

[0030] Preferably, if Figure 2As shown, the automatic control system includes a data acquisition unit, a processing and display unit and a central controller. The data acquisition unit is connected to each pressure monitoring unit to collect the pressure data monitored by each pressure monitoring unit; the processing and display unit is used to process the pressure data collected by the data acquisition unit and send it to the pressure control unit; the central controller includes a pressure control unit and a temperature control unit, the pressure control unit is used to compare the collected pressure value in the pressing chamber with the pre-stored standard working curve, and adjust the feeding screw speed and the pressing screw speed through the network communication interface according to the comparison result, so as to ensure the pressing effect and pressing efficiency; the temperature control unit is respectively connected to the temperature monitoring unit and the cooling unit, and is used to analyze the temperature distribution of the bursting chamber according to the temperature of different positions of the bursting chamber collected by the temperature monitoring unit, and control the cooling water flow in the cooling unit according to the analysis result, so as to achieve the purpose of making the bursting chamber temperature not higher than 70°C.

[0031] Preferably, the data acquisition unit includes a multi-channel signal conditioning module 81 and an excitation power supply 82. The multi-channel signal conditioning module 81 is used to convert the resistance signal monitored by each pressure monitoring unit into a current signal, and the excitation power supply 82 is used to amplify the current signal. The excitation power supply 82 uses a 24V power supply.

[0032] Preferably, the processing and display unit adopts a touch display screen.

[0033] Preferably, the pressure control unit adopts a central controller 83, which is used to collect and compare the pressures of the pressing chamber collected by each pressure monitoring unit, timely reflect the abnormal working conditions in the pressing chamber and make timely responses, and can correspond the abnormal pressure in the pressing chamber to production problems such as smoothing and jamming, control the feeding screw and the pressing screw to quickly give feedback, and adjust the pressing pressure in the pressing chamber. The pressure change in the pressing chamber corresponds to the wear of the wearing parts, and the electronic screen prompts the technicians to replace the parts and the maximum time they can be used.

[0034] Preferably, if Figure 3 As shown, each oil filtering section of the pressing cage 2 includes a plurality of first pressing bars 14 and a second pressing bar 19, and each first pressing bar 14 and second pressing bar 19 are arranged in a circle along the inner diameter of the pressing cage 2 and fixed by a pressing plate 140, and each adjacent first pressing bar 14 is padded with a gasket so that an oil outlet gap is reserved between adjacent first pressing bars 14. The gaskets between adjacent first pressing bars 14 in each oil filtering section can be set to different thicknesses to form oil filtering gaps of different sizes.

[0035] Preferably, if Figure 4As shown, the second pressing bar 19 is arranged in the middle of the side of the pressing cage 2, and a threaded hole is opened on the second pressing bar 19. More preferably, the threaded hole is opened in the center of the side of the second pressing bar 19 for installing the melt pressure sensor in the pressure monitoring unit.

[0036] Preferably, each pressure monitoring unit is arranged above the horizontal center line of the pressing chamber.

[0037] Preferably, each pressure monitoring unit is arranged on each oil filtering section of the screw oil press cage 2, and at least one pressure monitoring unit is arranged on each oil filtering section.

[0038] Preferably, the pressure monitoring unit includes a strain gauge sensor 13 and a melt pressure sensor 4. The strain gauge sensor 13 is installed on at least one first pressing bar 14 in each oil filtering section, and the melt pressure sensor 4 is detachably installed on the second pressing bar 19 through a threaded hole with the same size as the detection head of the melt pressure sensor 4 opened on the second pressing bar 19, and each strain gauge sensor 13 and melt pressure sensor are connected to the data acquisition unit in the automatic control system through a wire. The strain gauge sensor 13 is used to monitor the real-time changes of the pressure in the pressing chamber for a long time, and the melt pressure sensor 4 is used to calibrate the strain gauge sensor 13 regularly. The melt pressure sensor 4 contacts the material to directly obtain the pressure data, so as to directly obtain the pressure data of multiple positions, and is used to calibrate the reading of the strain gauge sensor 13 regularly, generally once a month; since the melt pressure sensor 4 cannot be placed in the pressing cage 2 for a long time to contact the material, when calibration is not required, the melt pressure sensor 4 is removed, and a screw is placed in the opening of the second pressing bar 19 to avoid leakage and deformation of the second pressing bar 19.

[0039] Preferably, when only one strain gauge sensor 13 is provided in the pressure monitoring unit, it is adhered to the outer surface of the common pressing bar 14 at an adjacent position below the second pressing bar 19 .

[0040] Preferably, if Figure 5As shown, when the strain gauge sensor 13 in the pressure monitoring unit is connected to the signal conditioning module 81, in order to simplify the operation and ensure the accuracy of the pressure data, the strain gauge sensor 13 of the present invention is connected to the signal conditioning module 81 using the half-bridge method. At the same time, considering that when the strain gauge is used to measure the bending stress, the change of the temperature of the pressing chamber will cause the strain gauge to deform, and at the same time affect the resistance of the strain gauge, which will affect the monitoring result, it is necessary to use a temperature compensation strain gauge 131 to eliminate the influence of temperature on the measurement result. The specific connection method is: take five other pressing bars and place them independently outside the pressing cage 2, keep them in contact with the pressing cage 2, and make their temperature the same as that of the ordinary pressing bars 14 in the pressing chamber. Paste the temperature compensation strain gauge 131 on these pressing bars to compensate for the temperature change in the pressing chamber, and use two precise resistors 132 and 133 to form a half-bridge connection with the strain gauge sensor 13 at the same time, the output signal is connected to the signal conditioning module 81, the excitation power supply 82 is used for power supply amplification, and the analog signal passes through the central controller 83 in the form of current, and the pressure of the strain gauge is displayed on the touch panel.

[0041] Preferably, the temperature monitoring unit is disposed on the partition plate 3 of the pressing cage 2 , and is used to collect temperature data at different positions of the pressing chamber and send the data to the automatic control system 8 .

[0042] Preferably, the temperature monitoring unit includes at least three metal temperature sensors attached to the pressing section and the discharging section of the pressing cage 2, which are used to collect temperature data at different positions of the pressing chamber and send them to the temperature control unit in the automatic control system.

[0043] Preferably, if Figure 6 As shown, the cooling unit 18 includes a water inlet and a water outlet arranged on the end shield of the squeezing screw shaft 15 at the cake outlet end, wherein the water inlet is connected to the hollow main shaft 180 of the squeezing screw shaft 15 through a slender water pipe, and the water outlet is connected to the circulating water tank; the water inlet and the water outlet are respectively provided with a water inlet valve 17 and a water outlet valve 16, and the water inlet valve 17 and the water outlet valve 16 are both connected to the temperature control unit in the automatic control system and controlled by the temperature control unit. After the water inlet valve is opened, the cooling water flows to the feed end through a slender water pipe in the hollow main shaft 180, and then flows through the entire squeezing screw shaft 15 in the gap between the hollow main shaft 180 and the water inlet pipe, and returns to the cake outlet end, thereby achieving the purpose of cooling the squeezing chamber. Cooperating with the temperature monitoring unit, the temperature in the squeezing chamber is controlled below 70°C to meet the requirements of low-temperature squeezing.

[0044] Example 1

[0045] like Figure 1 FIG. 1 is a schematic diagram of the installation position of a pressure monitoring device for a pressing chamber of a screw oil press according to an exemplary embodiment of the present invention.

[0046] Press the main motor start button 10, and the pressing spindle starts to run. Open the cooling water inlet manual valve 17. After 5 minutes, turn on the feed motor start button 7, the material enters the press chamber, and the pressing starts. The pressure monitoring unit starts to collect data and controls the speed of the motor 12 through the automatic control system 8. The touch screen displays the real-time pressure values ​​at different positions in the press chamber. When shutting down the oil press, first turn off the feed motor stop button 6, and then turn off the main motor stop button 9.

[0047] The system of the present invention can record the pressure on the pressing bar every second for real-time viewing. However, the display screen only displays the maximum pressure value per minute at different positions of the pressing chamber, which is convenient for real-time monitoring of the working status of the oil press and allows operators to promptly discover hardware problems in the pressing chamber.

[0048] The present invention uses a high temperature melt pressure sensor 4 to perform regular calibration on the monitoring reading of the resistance strain gauge sensor 13, generally once a month. During calibration, two sensors are used to collect the pressure in the press chamber at the same time. When the maximum pressures collected by the two sensors at the same axial position every minute are the same, it indicates that the calibration process is completed.

[0049] like Figure 7 As shown, taking the gap of the pressing bar 14 in the fourth gear (i.e. the fourth oil filtering section) as an example, 11 minutes after the start of feeding, the strain gauge sensor 13 detected that the pressure reached a maximum value of 40MPa. Then the pressure dropped, and after 15 minutes of pressing, the pressure tended to stabilize. Finally, the pressure stabilized in the range of 36-38MPa.

[0050] like Figure 8 The figure shows the pressure distribution after the pressure in the press chamber stabilizes. 15 minutes after the start of pressing, the pressure in the press chamber tends to be stable. The maximum pressure in the press chamber is stable in the range of 36-38MPa.

[0051] After the oil press is working stably, the material is mixed with the pressed cakes, the pressure in the press chamber increases, and the frequency of the feeding screw motor automatically decreases. After 2 minutes, the pressure in the press chamber decreases and tends to be stable.

[0052] After the oil press is working stably, animal fat is mixed in the material for pressing, and the pressure in the pressing chamber drops suddenly. The central controller 83 automatically identifies the "slippery chamber", automatically and slowly stops the machine and alarms.

[0053] Example 1 shows that the pressure monitoring device of the press chamber of the present invention can effectively monitor the radial pressure of the press chamber, and can accurately describe a series of pressure dynamic reactions of the screw oil press from startup to adjustment and then entering steady-state operation, which has important practical significance for controlling the operation of the screw oil press.

[0054] Example 2

[0055] like Figure 1 FIG. 1 is a schematic structural diagram of a low-temperature screw oil press chamber cooling device according to an exemplary embodiment of the present invention.

[0056] Press the main motor start button 10, and the pressing spindle starts to run. Open the cooling water inlet manual valve 17. After 5 minutes, turn on the feed motor start button 7, the material enters the press chamber, and the pressing starts. The temperature monitoring unit starts to collect data, and controls the cooling water flow by adjusting the water inlet valve and the water outlet valve. The touch screen displays the real-time temperature values ​​at different positions in the press chamber.

[0057] As a preferred solution, the invention uses an electric regulating valve to adjust the opening of the inlet and outlet water pipes to change the cooling water flow rate.

[0058] like Figure 6 The cooling structure of the present invention is shown in FIG. 45. After 45 minutes of pressing, the temperature sensor detects that the temperature in the press chamber exceeds 50°C. The cooling water inlet and outlet valves are automatically opened, and the cooling water slowly flows into the cooling water pipe. The cooling water flows through the hollow main shaft, fully absorbs the heat of the pressing screw, and then flows out from the water outlet of the conical shield. Finally, the temperature in the press chamber is stabilized below 70°C.

[0059] Example 2 shows that the temperature monitoring device of the pressing chamber of the present invention can effectively monitor the temperature of the pressing chamber and stabilize the temperature in the pressing chamber below 70° C., which has important application value for optimizing the operation of the low-temperature screw oil press.

[0060] The above embodiments are only used to illustrate the present invention, wherein the structure, connection mode and manufacturing process of each component may be changed. Any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. An intelligent low-temperature screw oil press with a pressure monitoring device, comprising a screw oil press, the screw oil press comprising a frame, a pressing cage, a pressing screw shaft, a feeding device, a reducer and a motor, the pressing screw shaft is arranged in a pressing chamber of the frame, and the pressing screw shaft is electrically connected to the motor through the reducer; the pressing cage is sleeved on the pressing screw shaft, and the pressing cage is provided with a plurality of oil filtering sections separated by partitions; the characteristics are: It also includes a pressure monitoring unit, a temperature monitoring unit, a cooling unit and an automatic control system; The pressure monitoring unit is arranged in each oil filtering section of the pressing cage, and is used to monitor the pressure data of each oil filtering section in real time and send it to the automatic control system; The automatic control system controls and adjusts the feeding speed and the spindle speed according to the received pressure data; The temperature monitoring unit is used to monitor the temperature data of different positions in the pressing chamber and send it to the automatic control system; The cooling unit is used to ensure that the pressing chamber is in a low temperature environment not higher than 70°C according to the control signal sent by the automatic control system; The automatic control system includes a data acquisition unit, a processing and display unit and a central controller; The data acquisition unit is connected to each of the pressure monitoring units and is used to collect the pressure data monitored by each of the pressure monitoring units; The processing and display unit is used to process the pressure data collected by the data collection unit and send it to the central controller; The central controller includes a pressure control unit and a temperature control unit. The pressure control unit is used to compare the collected pressure value in the pressing chamber with the pre-stored standard working curve, and adjust the feeding screw speed and the pressing screw speed through the network communication interface according to the comparison result; The temperature control unit is connected to the temperature monitoring unit and the cooling unit respectively, and is used to analyze the temperature distribution of the bursting chamber according to the temperatures at different positions of the bursting chamber collected by the temperature monitoring unit, and control the cooling water flow of the cooling unit according to the analysis results, so as to achieve the purpose of making the bursting chamber temperature not higher than 70°C; Each oil filtering section of the pressing cage includes a plurality of first pressing bars and a second pressing bar, wherein the second pressing bar is arranged in the middle of the side of the pressing cage, and a threaded hole for installing the pressure monitoring unit is opened on the second pressing bar; The pressure monitoring unit includes a strain gauge sensor and a melt pressure sensor; the strain gauge sensor is installed on at least one of the first pressing bars in each oil filtering section, and the melt pressure sensor is detachably installed on the second pressing bar through a threaded hole opened on the second pressing bar and having the same size as the detection head of the melt pressure sensor, and each of the strain gauge sensor and the melt pressure sensor is connected to the data acquisition unit in the automatic control system through a wire; the strain gauge sensor is used to monitor the real-time changes of the pressure in the pressing chamber for a long time, and the melt pressure sensor is used to regularly calibrate the strain gauge sensor.

2. The intelligent low-temperature screw oil press with a pressure monitoring device according to claim 1, characterized in that: The data acquisition unit includes a multi-channel signal conditioning module and an excitation power supply. The multi-channel signal conditioning module is used to convert the resistance signal monitored by each pressure monitoring unit into a current signal. The excitation power supply is used to supply power and amplify the current signal at the same time.

3. The intelligent low-temperature screw oil press with a pressure monitoring device as claimed in claim 1, characterized in that: At least one pressure monitoring unit is arranged on each of the oil filtering sections.

4. The intelligent low-temperature screw oil press with a pressure monitoring device as claimed in claim 1, characterized in that: When each of the pressure monitoring units is connected to the automatic control system, the strain gauge sensor cooperates with the temperature compensation strain gauge and two resistors to form a half-bridge wiring.

5. The intelligent low-temperature screw oil press with a pressure monitoring device as claimed in claim 4, characterized in that: The temperature compensation strain gauge is adhered to the outer surface of the third pressing bar, and the third pressing bar is independently placed outside the pressing cage and keeps in contact with the corresponding oil filtering section of the pressing cage, so that its temperature is the same as that of the first pressing bar in the corresponding oil filtering section in the pressing chamber.

6. The intelligent low-temperature screw oil press with a pressure monitoring device according to claim 1, characterized in that: The temperature monitoring unit includes at least three metal temperature sensors attached to the pressing section and the discharging section of the pressing cage, which are used to collect temperature data at different positions of the pressing chamber and send them to the automatic control system.

7. The intelligent low-temperature screw oil press with a pressure monitoring device as claimed in claim 1, characterized in that: The cooling unit includes a water inlet and a water outlet arranged on the end shield of the squeezing screw shaft at the cake outlet end, wherein the water inlet is connected to the hollow main shaft of the squeezing screw shaft through a slender water pipe, and the water outlet is connected to a circulating water tank; the water inlet and the water outlet are respectively provided with a water inlet valve and a water outlet valve, and the water inlet valve and the water outlet valve are both connected to the automatic control system and controlled by the automatic control system.

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