Vacuum sealing machine capable of adapting to high-altitude environment

Abstract

The utility model provides a vacuum sealing machine capable of adapting to a high altitude environment, which is characterized by comprising a sealing machine body and a vacuum module, the sealing machine body comprises an upper cover and a machine body, a vacuum cavity is formed when the upper cover and the machine body are buckled, the vacuum module comprises a vacuum pump communicated with the vacuum cavity, and the vacuum pump comprises a driving motor. The driving motor is used for driving the vacuum pump to vacuumize an object to be sealed in the vacuum chamber; the control module comprises a control unit and a rotating speed detection unit electrically connected with the control unit, the rotating speed detection unit calculates the real-time rotating speed of the driving motor based on the pulse signal time, and the control unit is used for judging the vacuum degree condition in the vacuum chamber according to the real-time rotating speed of the driving motor. And the vacuumizing time of the vacuum pump is adjusted in time, so that the problem of measurement error caused by low air pressure at high altitude of a traditional pressure sensor is solved.

Description

Technical Field

[0001] This utility model relates to a vacuum sealing machine that can adapt to high-altitude environments and is applied in the field of vacuum sealing. Background Technology

[0002] A vacuum sealing machine is a device used for vacuum packaging of goods. It automatically completes the vacuuming and sealing of packaging bags, effectively maintaining the freshness of the goods and preventing oxidation and spoilage. However, existing vacuum sealing machines typically use mechanical or digital pressure sensors to measure the pressure inside the vacuum chamber. In high-altitude areas, due to the lower external atmospheric pressure, the pressure difference between the vacuum chamber and the outside air is significant. Traditional pressure sensors are prone to large errors during measurement, which may lead to incomplete vacuuming when the equipment operates in high-altitude environments.

[0003] To address this issue, this invention proposes a vacuum sealing machine adaptable to high-altitude environments. By optimizing the pressure detection and control mechanism, the device can accurately measure the pressure within the vacuum chamber at high altitudes, ensuring the integrity of the vacuuming process and the stability of the packaging effect, thereby improving the applicability and reliability of the equipment in different altitude environments. Utility Model Content

[0004] This invention provides a vacuum sealing machine that can adapt to high-altitude environments, effectively solving the above-mentioned problems.

[0005] This utility model is implemented as follows:

[0006] A vacuum sealing machine adaptable to high-altitude environments includes:

[0007] The sealing machine body includes a top cover and a body, wherein the top cover and body have a vacuum chamber when fastened together.

[0008] A vacuum module includes a vacuum pump connected to a vacuum chamber, the vacuum pump including a drive motor, the drive motor being used to drive the vacuum pump to perform a vacuuming operation on an item to be sealed within the vacuum chamber;

[0009] The control module includes a control unit and a speed detection unit electrically connected to the control unit. The speed detection unit calculates the real-time speed of the drive motor based on the pulse signal time. The control unit is used to determine the vacuum level in the vacuum chamber according to the real-time speed of the drive motor and adjust the vacuum pump pumping time in a timely manner.

[0010] A bag opening heat sealing module is used to seal the item to be sealed.

[0011] As a further improvement, the control unit stores a vacuum-speed calibration curve, and monitors the motor speed in real time through the speed monitoring unit. By comparing the real-time monitored speed of the drive motor with the vacuum-speed calibration curve, it is determined whether the target vacuum level has been reached.

[0012] As a further improvement, the rotational speed detection unit is a Hall sensor, and a permanent magnet is mounted on the rotating part of the drive motor, with a distance of 1~5mm between the permanent magnet and the Hall sensor.

[0013] As a further improvement, the control module also includes a pressure sensing unit installed inside the vacuum chamber. The pressure sensor is electrically connected to the control unit. The pressure sensing unit is a digital pressure sensor used to detect the pressure value inside the vacuum chamber.

[0014] As a further improvement, the control module also includes a temperature sensing unit installed inside the vacuum chamber, the temperature sensing unit being used to detect the temperature inside the vacuum chamber.

[0015] The beneficial effects of this utility model are:

[0016] (1) By monitoring the real-time speed of the drive motor through the control module and judging the negative pressure in the vacuum chamber by the real-time speed of the drive motor, the vacuuming time is dynamically adjusted, which solves the measurement error problem caused by low air pressure at high altitudes of traditional pressure sensors.

[0017] (2) The vacuum degree-speed calibration curve under standard atmospheric pressure is obtained through experiments. The actual speed of the drive motor is detected by the speed detection unit. The real-time monitored speed of the drive motor is compared with the vacuum degree-speed calibration curve to determine whether the target vacuum degree has been reached. If the real-time monitored speed of the drive motor fits the vacuum degree-speed calibration curve, it is determined that the target vacuum degree has been reached. After the preset vacuuming time, the vacuuming operation is stopped. If the real-time monitored speed of the drive motor deviates from the fit of the vacuum degree-speed calibration curve, it is determined that the target vacuum degree has not been reached. The vacuuming time is extended until the fit is reached and the vacuuming operation is stopped. Through this method, the vacuum state in the vacuum chamber can be accurately obtained, so that the vacuum sealing machine can completely vacuum the items to be sealed. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1This is a structural schematic diagram provided by an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the installation structure of the pressure sensing unit and temperature sensing unit provided in this embodiment of the utility model.

[0021] Figure 3 This is an exploded view of the structure provided in an embodiment of the present invention.

[0022] The attached diagram is labeled as follows:

[0023] 10. Sealing machine body; 11. Top cover; 12. Machine body; 13. Vacuum chamber;

[0024] 20. Vacuum module; 21. Vacuum pump; 22. Drive motor;

[0025] 30. Control module; 31. Control unit; 32. Speed ​​detection unit; 33. Pressure sensing unit; 34. Temperature sensing unit;

[0026] 40. Bag opening heat sealing module. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0028] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] Reference Figures 1-3As shown, a vacuum sealing device adaptable to high-altitude environments includes: a sealing machine body 10, including a top cover 11 and a body 12, wherein when the top cover 11 and the body 12 are fastened together, a vacuum chamber 13 is formed; and a vacuum module 20, including a vacuum pump 21 connected to the vacuum chamber 13, wherein the vacuum pump 21 includes a drive motor 22, the drive motor 22 being used to drive the vacuum pump 21 to perform a vacuuming operation on the items to be sealed in the vacuum chamber 13; and a bag opening heat sealing module 40, which is used to seal the items to be sealed after the vacuuming operation.

[0030] The control module 30 includes a control unit 31 and a speed detection unit 32 electrically connected to the control unit 31. The speed detection unit 32 calculates the real-time speed of the drive motor 22 based on the pulse signal time. The control unit 31 is used to determine the vacuum level in the vacuum chamber 13 according to the real-time speed of the drive motor 22 and adjust the vacuum pump 21 vacuuming time in a timely manner.

[0031] The rotational speed detection unit 32 is a Hall sensor. A permanent magnet is mounted on the rotating part of the drive motor 22. A permanent magnet (such as a neodymium magnet) is mounted on the rotating part (such as a shaft or coupling) of the drive motor 22 to ensure a fixed number of magnetic field changes per revolution. The distance between the permanent magnet and the Hall sensor is 1~5mm. In this embodiment, a switch-type Hall sensor (such as A3144) is fixed close to the magnet, with the distance controlled within 1~5mm to ensure reliable detection of magnetic field changes. The Hall sensor outputs a pulse signal, and the rise time interval of the pulse is captured by the control unit 31 (MCU). The calculation formula is:

[0032] Rotational speed (RPM) =

[0033] As a further improvement, the control module 30 also includes a pressure sensing unit 33 installed within the vacuum chamber 13. The pressure sensor is electrically connected to the control unit 31. The pressure sensing unit 33 is a digital pressure sensor used to detect the pressure value within the vacuum chamber 13. The control module 30 also includes a temperature sensing unit 34 installed within the vacuum chamber 13, used to detect the temperature within the vacuum chamber 13.

[0034] A vacuum sealing method adaptable to high-altitude environments includes the following steps:

[0035] S1: Control unit 31 initializes the vacuum-speed calibration curve under standard atmospheric pressure;

[0036] S2: Place the item to be sealed into the vacuum chamber 13 of the vacuum sealing equipment, preset the vacuuming time, and start the vacuum sealing equipment to begin the vacuuming operation;

[0037] S3: The motor speed is monitored in real time by the speed monitoring unit. The real-time monitored speed of the drive motor 22 is compared with the vacuum degree-speed calibration curve to determine whether the target vacuum degree has been reached.

[0038] S4: If the drive motor 22 monitors the speed and fits the vacuum degree-speed calibration curve in real time, it is determined that the target vacuum degree has been reached. After the preset vacuuming time, the vacuuming operation is stopped. If the drive motor 22 monitors the speed and the vacuum degree-speed calibration curve in real time and there is a deviation, it is determined that the target vacuum degree has not been met. The vacuuming time is extended until the fit is achieved and the vacuuming operation is stopped.

[0039] S5: The test item is heat-sealed using the bag opening heat-sealing module 40.

[0040] In one embodiment, the vacuum-speed calibration curve is N(P) = · ,in, This is the no-load speed. This is the pumping resistance coefficient. Let P be the load characteristic coefficient and P be the absolute pressure value. Since the load of the vacuum pump is inversely proportional to the absolute pressure P within the vacuum chamber, when the vacuum level increases (P decreases), the gas molecule density decreases, but the turbulence effect and molecular flow resistance increase, leading to an increase in motor load and a decrease in speed N. Therefore, the relationship between the vacuum level and speed calibration curve is experimentally verified.

[0041] This experiment used a vacuum pump with an ultimate vacuum of 0.1 kPa, a brushless DC motor with a rated speed of 3000 RPM, an Allegro A3144 Hall sensor, a Bosch BMP388 (range 0~110 kPa) digital pressure sensor, and a DS18B20 (-55°C~125°C) temperature sensor. First, the motor's no-load speed was recorded under standard atmospheric pressure (101.3 kPa). The vacuum was gradually evacuated to the ultimate pressure (e.g., 1 kPa), and the following data was obtained:

[0042] Table 1 Absolute Pressure - Measured Rotation Speed ​​Data

[0043]

[0044] Then, the model is fitted using linear least squares to minimize the sum of squared residuals between the model's predicted and measured values.

[0045]

[0046] Optimized parameters are =2980.5 RPM =25320.3, =115.2, α=0.068

[0047] The obtained vacuum-speed calibration curve is as follows:

[0048] N(P) = ·

[0049] By the coefficient of determination ( Determine the degree of fit:

[0050] =0.992>0.95, therefore the curve conforms to the functional relationship between vacuum degree and real-time rotation speed under standard atmospheric pressure.

[0051] Because the vacuum-speed calibration curve is affected by manufacturing tolerances, mechanical wear, and environmental changes, errors may occur. Therefore, the pressure and temperature values ​​inside the vacuum chamber 13 are detected by the pressure sensing unit 33 and the temperature sensing unit 34. The calibration curve parameters are updated in real time using the nonlinear least squares method, and the mean absolute error (MEA) and coefficient of determination are calculated. The operation steps are as follows:

[0052] S31: The vacuum-speed calibration curve is calibrated by pressure sensing unit 33 and temperature sensing unit 34.

[0053] As a further improvement, the calibration of the vacuum-speed calibration curve using the pressure sensing unit 33 and the temperature sensing unit 34 includes:

[0054] S311: Real-time speed, absolute pressure value, and temperature data of drive motor 22 are synchronously collected through control unit 31;

[0055] S312: Noise filtering is performed on the real-time speed, absolute pressure, and temperature data of the drive motor 22.

[0056] S313: Update calibration curve parameters in real time using the nonlinear least squares method, including the following steps: = ( )

[0057] in: = For parameter vectors; = For the regression vector, The actual measured value of the parameter. The Kalman gain matrix;

[0058] S314: Add a temperature compensation term to the calibration curve to correct temperature drift in the pressure sensor and motor efficiency.

[0059] ·

[0060] in: For reference temperature; Temperature coefficient;

[0061] S315: Calculate the mean absolute error (MEA) and the coefficient of determination ( ), and judge according to the qualification standards:

[0062] Mean absolute error:

[0063] MEA= ;

[0064] Coefficient of determination:

[0065] =1

[0066] The acceptable standard is MEA < 50 RPM. >0.95.

[0067] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vacuum sealing machine adaptable to high-altitude environments, characterized in that, include: The sealing machine body includes a top cover and a body, wherein the top cover and body have a vacuum chamber when fastened together, and A vacuum module includes a vacuum pump connected to a vacuum chamber, the vacuum pump including a drive motor, the drive motor being used to drive the vacuum pump to perform a vacuuming operation on an item to be sealed within the vacuum chamber; The control module includes a control unit and a speed detection unit electrically connected to the control unit. The speed detection unit calculates the real-time speed of the drive motor based on the pulse signal time. The control unit is used to determine the vacuum level in the vacuum chamber according to the real-time speed of the drive motor and adjust the vacuum pump pumping time in a timely manner. A bag opening heat sealing module is used to seal the item to be sealed.

2. The vacuum sealing machine adaptable to high-altitude environments according to claim 1, characterized in that, The control unit stores a vacuum-speed calibration curve. The motor speed is monitored in real time by the speed monitoring unit. The real-time monitored speed of the drive motor is compared with the vacuum-speed calibration curve to determine whether the target vacuum level has been reached.

3. A vacuum sealing machine adaptable to high-altitude environments according to claim 1, characterized in that, The rotational speed detection unit is a Hall sensor, and a permanent magnet is installed on the rotating part of the drive motor. The distance between the permanent magnet and the Hall sensor is 1~5mm.

4. A vacuum sealing machine adaptable to high-altitude environments according to claim 3, characterized in that, The control module also includes a pressure sensing unit installed in the vacuum chamber. The pressure sensor is electrically connected to the control unit. The pressure sensing unit is a digital pressure sensor, which is used to detect the pressure value in the vacuum chamber.

5. A vacuum sealing machine adaptable to high-altitude environments according to claim 4, characterized in that, The control module also includes a temperature sensing unit installed inside the vacuum chamber, which is used to detect the temperature inside the vacuum chamber.

Images