Control method of uniform mixing and sampling device and uniform mixing and sampling device

Abstract

The invention relates to the technical field of sample extraction, and discloses a control method of a blending sampling device and the blending sampling device.The control method is applied to the blending sampling device.The control method comprises the steps that a stirring driving module and a lifting driving module of the blending sampling device are controlled to operate cooperatively, the stirring module rotates around a shaft while moving up and down in the vertical direction, lifting and stirring compound motion is executed on the liquid to be sampled, and stirred liquid is obtained; and controlling a sampling driving module of the uniform mixing and sampling device to perform staged liquid collection on the stirred liquid by adopting a differential pressure control strategy to obtain a target liquid sample. By means of the control method, on the premise that manual intervention is not needed, the liquid to be sampled is evenly and sufficiently mixed, and it is guaranteed that sampling is accurate and repeatability is high.

Description

Technical Field

[0001] This application relates to the field of sample extraction technology, and in particular to a control method and a mixing sampling device. Background Technology

[0002] With the modernization of the tobacco industry, the quality control requirements for flavorings and fragrances in cigarette production are becoming increasingly stringent. As key factors affecting the flavor and quality stability of cigarettes, the proportions, mixing uniformity, and representativeness of flavorings and fragrances during production directly impact the consistency of the final product's quality. Currently, in cigarette manufacturing enterprises, flavorings and fragrances are generally stored and transported in drums, and each batch requires quality testing before use to ensure compliance with process standards. Sampling during quality inspection is a prerequisite for accurate analytical results. Conventional practices rely on manual sampling preparation, including manually stirring the materials in the drum with a stirring rod to achieve uniform mixing, or obtaining samples through pouring, inserting tubes, or scooping. Because fragrances and flavorings have high viscosity and poor flowability, and the storage containers are usually deep, manual stirring during actual operation makes it difficult to fully break up material stratification or sedimentation, resulting in concentration differences between the bottom and top layers. Furthermore, sampling locations are greatly affected by human factors, making it impossible to guarantee that a representative overall sample can be collected each time. In addition, due to the weight of the container itself plus the weight of the liquid inside, operators experience high labor intensity and fatigue during frequent handling, tilting, or prolonged hand-held tool operation, affecting work efficiency and operational standardization. Summary of the Invention

[0003] In view of this, the present application provides a control method and a mixing sampling device for a mixing sampling device, which can effectively solve the problems in the quality inspection of fragrances and flavors in the prior art, such as the inability to collect a complete sample due to manual sampling, which affects the efficiency and standardization of operation.

[0004] In a first aspect, embodiments of this application provide a control method for a homogenizing sampling device, applied to the homogenizing sampling device, comprising: The stirring drive module and the lifting drive module of the mixing and sampling device are controlled to work together so that the stirring module moves vertically up and down while rotating around the axis, performing a combined lifting and stirring motion on the liquid to be sampled, and obtaining the stirred liquid. The sampling drive module controlling the mixing and sampling device uses a differentiated pressure control strategy to collect liquid samples in stages after stirring, thereby obtaining the target liquid sample.

[0005] In some embodiments, the combined lifting and stirring motion of the liquid to be sampled includes a first stirring stage, a second stirring stage, and a third stirring stage performed sequentially: In the first stirring stage, the stirring drive module controls the rotation speed of the stirring module within a first preset rotation speed range, and the lifting drive module controls the lifting amplitude of the stirring module within a first preset depth range and the lifting frequency of the stirring module within a first preset frequency range. In the second stirring stage, the stirring drive module controls the rotation speed of the stirring module within a second preset rotation speed range, and the lifting drive module controls the lifting amplitude of the stirring module within a second preset depth range and the lifting frequency of the stirring module within a second preset frequency range. In the third stirring stage, the stirring drive module controls the rotation speed of the stirring module to be within a third preset rotation speed range, and the lifting drive module controls the lifting frequency of the stirring module to be within a third preset frequency range. Wherein, the upper limit of the first preset speed range is higher than the upper limit of the second preset speed range, the upper limit of the second preset speed range is higher than the upper limit of the third preset speed range, the upper limit of the second preset depth range is higher than the upper limit of the first preset depth range, and the upper limit of the second preset frequency range is higher than the upper limits of both the first and third preset frequency ranges.

[0006] In some embodiments, the sampling drive module is a vacuum pump, and the sampling drive module that controls the mixing and sampling device uses a differentiated pressure control strategy to perform staged liquid collection of the stirred liquid to obtain a target liquid sample, including: The vacuum pump controls the sampling module of the mixing and sampling device to draw up the stirred liquid within a first preset pressure range until the sampling module's collection volume reaches a first preset ratio of the target collection volume. The vacuum pump controls the sampling module to draw up the stirred liquid within a second preset pressure range until the sampling volume reaches a second preset proportion of the target sampling volume; the upper limit of the second preset pressure range is less than the upper limit of the first preset pressure range. The sampling module is controlled by the vacuum pump to sample the stirred liquid dropwise to obtain the target liquid sample.

[0007] In some embodiments, the sampling drive module controlling the mixing and sampling device employs a differentiated pressure control strategy to perform staged liquid sampling of the stirred liquid to obtain a target liquid sample, including: Sampling is paused when the sampling volume of the sampling module of the mixing sampling device reaches the third preset ratio of the target sampling volume; The sampling data from the sampling module is reacquired after a preset delay. If the amount collected by the sampling module is less than the target amount collected, the sampling driving module controls the sampling module to perform single-drop sampling until the target amount collected is reached.

[0008] In some embodiments, the coordinated operation of the stirring drive module and the lifting drive module of the mixing and sampling device includes: If the viscosity of the liquid to be sampled is within a first preset viscosity range, the stirring drive module controls the rotation speed of the stirring module to be less than a fourth preset ratio of the rated rotation speed. If the viscosity of the liquid to be sampled is within a second preset viscosity range, the stirring drive module controls the rotation speed of the stirring module to be greater than a fifth preset ratio of the rated rotation speed, and the upper limit of the first preset viscosity range is greater than the upper limit of the second preset viscosity range.

[0009] In some embodiments, before the stirring drive module and the lifting drive module of the mixing and sampling device operate in coordination, the control method further includes: Acquire the liquid level height signal from the ranging module of the mixing sampling device; The lifting safety range of the stirring module is set according to the liquid level height signal; The stirring module is controlled to be located within the lifting safety zone.

[0010] In some embodiments, the coordinated operation of the stirring drive module and the lifting drive module of the mixing and sampling device includes: If the parameters of the stirring module are abnormal or the rising or falling height of the stirring module exceeds the lifting safety range, the stirring module is controlled to stop stirring and rise to a preset safety height.

[0011] Secondly, embodiments of this application provide a mixing and sampling device, including a base with casters at the bottom; A lead screw drive mechanism is located on one side of the base and is fixed with a lifting drive module, a sampling drive module, and a platform for supporting the sampling module. The crossbeam has a driven end of the screw drive mechanism fixedly connected to one end, and a stirring module and a stirring drive module provided at the other end. The stage integrates a controller, which controls the stirring module to perform a combined lifting and stirring motion on the liquid to be sampled through the lifting drive module and the stirring drive module to obtain the stirred liquid. The stirring drive module then uses a differentiated pressure control strategy to collect the stirred liquid in stages to the sampling module to obtain the target liquid sample.

[0012] In some embodiments, the mixing and sampling device further includes a human-computer interaction device.

[0013] In some embodiments, the mixing and sampling device is a spice mixing and sampling device.

[0014] The embodiments of this application have the following beneficial effects: The control method of this application is applied to a mixing and sampling device, comprising: controlling the stirring drive module and the lifting drive module of the mixing and sampling device to operate in coordination, so that the stirring module moves vertically up and down while rotating around an axis, performing a combined lifting and stirring motion on the liquid to be sampled to obtain a stirred liquid; controlling the sampling drive module of the mixing and sampling device to use a differentiated pressure control strategy to collect liquid in stages from the stirred liquid to obtain a target liquid sample. By controlling the stirring drive module and the lifting drive module to operate in coordination, the stirring module can perform reciprocating motion in the vertical direction while rotating, thereby forming a three-dimensional composite flow field with axial, radial and vertical superposition inside the liquid, effectively breaking the stratification and deposition phenomenon of high viscosity liquids, and significantly improving the uniformity and efficiency of mixing; at the same time, by using a differentiated pressure control strategy to implement staged liquid collection, the overshoot and error in the sampling process are greatly reduced, and finally, the liquid to be sampled is fully mixed without human intervention, ensuring sampling accuracy and high repeatability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A first structural schematic diagram of the mixing and sampling device according to an embodiment of this application is shown; Figure 2 A schematic diagram of the driven end of the lead screw drive mechanism according to an embodiment of this application is shown; Figure 3 This paper shows a schematic diagram of the connection between the driven end and the nut in a lead screw drive mechanism according to an embodiment of this application. Figure 4 A schematic diagram of the sampling bottle according to an embodiment of this application is shown; Figure 5 This paper shows a first flowchart of the control method of the mixing and sampling device according to an embodiment of the present application; Figure 6 This paper shows a second flowchart illustrating the control method of the mixing and sampling device according to an embodiment of the present application; Figure 7A third flowchart of the control method for the mixing and sampling device according to an embodiment of this application is shown; Figure 8 The fourth flowchart of the control method of the mixing and sampling device according to an embodiment of this application is shown.

[0017] Explanation of key component symbols: 10: Base; 20: Screw drive mechanism; 30: Crossbeam; 40: Moving wheel; 50: Lifting drive module; 60: Sampling drive module; 70: Stirring drive module; 80: Platform; 90: Stirring module; 100: Sampling bottle; 101: First pipe; 102: Second pipe; 201: Nut; 202: Mounting hole; 203: Screw. Detailed Implementation

[0018] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0019] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0021] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0022] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] Considering the problems in the quality inspection of fragrances and flavorings in the existing technology, such as the inability to collect complete samples due to manual sampling, which affects work efficiency and operational standardization, this application provides a control method and a mixing sampling device. The control method of this application controls the stirring drive module 70 and the lifting drive module 50 to work together, so that the stirring module 90 rotates while performing vertical reciprocating motion, thereby forming a three-dimensional composite flow field with axial, radial and vertical superposition inside the liquid. This effectively breaks the stratification and deposition phenomenon of high viscosity liquids and significantly improves the uniformity and efficiency of mixing. At the same time, the sampling drive module 60 adopts a differentiated pressure control strategy to implement staged liquid collection, which greatly reduces overshoot and errors in the sampling process. Finally, without manual intervention, the liquid to be sampled is fully mixed, ensuring sampling accuracy and high repeatability.

[0024] The control method of the mixing and sampling device will be described below with reference to some specific embodiments. It is understood that the control method of the mixing and sampling device in this application embodiment is applied to the mixing and sampling device, which is applicable to the sampling of any liquid. The mixing and sampling device can be configured according to the actual application. Exemplarily, the mixing and sampling device in this application embodiment is used to sample flavorings and fragrances in the cigarette production process; the mixing and sampling device is a flavoring mixing and sampling device.

[0025] Exemplary, Figure 1 A schematic diagram of a mixing and sampling device according to an embodiment of this application is shown. It includes a base 10, a lead screw drive mechanism 20, a crossbeam 30, a moving wheel 40, a lifting drive module 50, a sampling drive module 60, a stirring module 90, a stirring drive module 70, and a platform 80 for supporting the sampling modules. The platform 80 integrates a controller, which controls the mixing and sampling device and implements the control method of the mixing and sampling device according to the embodiment of this application. This achieves a high degree of integration and operational coordination of the control system, and improves the equipment response accuracy and automation level.

[0026] Furthermore, the mixing and sampling device also includes a human-machine interface (HMI), which can be a touchscreen, a host computer, etc. The HMI allows for command input and feedback output, enabling users to monitor and adjust the mixing and sampling process in real time, thereby improving the overall intelligence, flexibility, and user experience of the device. The location of the HMI can be set according to the actual application. It can be placed on the lead screw drive mechanism 20, or it can be integrated into the stage 80, optimizing the spatial layout of the device and enhancing operational convenience and human-machine collaboration efficiency.

[0027] Specifically, the movable wheel 40 is located at the bottom of the base 10 to move the mixing and sampling device. Furthermore, the movable wheel 40 is a movable wheel with a braking and locking function, which can position and lock the device.

[0028] The base 10 is used to place a container filled with the liquid to be sampled. A screw drive mechanism 20 is provided on one side, and a lifting drive module 50, a sampling drive module 60, and a platform 80 are fixed to the screw drive mechanism 20. One end of the crossbeam 30 is fixedly connected to the driven end of the screw drive mechanism 20, and the other end is equipped with a stirring module 90 and a stirring drive module 70. Specifically, as shown... Figure 2 and Figure 3 As shown, the driven end of the screw drive mechanism 20 includes a nut 201 and two mounting holes 202 for fixing the driven end. The nut 201 and the screw 203 in the screw drive mechanism 20 are connected by a drive, and form a helical pair through threaded engagement, which converts the rotational motion of the screw 203 into the linear motion of the nut 201, thereby driving the stirring module 90 fixed on the crossbar to rise and fall.

[0029] Exemplarily, the stirring drive module 70 is a stirring motor, and the stirring module 90 is a stirring rod with blades. The number and shape of the blades can be set according to the actual application. The controller controls the start, stop, speed, and direction of the stirring motor, thereby regulating the rotational movement of the stirring rod. The lifting drive module 50 is a lifting motor. The controller controls the rotation of the lead screw 203 of the lead screw transmission mechanism 20 through the lifting motor, thereby realizing the lifting and lowering of the stirring rod.

[0030] like Figure 4As shown, the sampling module is a sampling bottle 100. The sampling bottle 100 is equipped with a first pipe 101 for connecting to the sampling drive module 60 and a second pipe 102 for connecting to the liquid. Exemplarily, the sampling drive module 60 is a vacuum pump. The controller controls the negative pressure created by the vacuum pump in the sampling bottle 100 to achieve controllable aspiration and quantitative collection of the liquid. Utilizing the principle of negative pressure to achieve non-contact or low-disturbance liquid sampling avoids potential contamination or wear from direct contact between mechanical pumping components and the sample, improving the cleanliness and reliability of the sampling. Simultaneously, the controller can adjust the suction pressure and time according to different liquid properties, achieving accurate and stable collection of various types of liquids, enhancing the system's adaptability and automation level, and making it suitable for applications involving high-precision, sterile, or micro-volume liquid processing.

[0031] Figure 5 A schematic flowchart of a control method for a homogenizing sampling apparatus according to an embodiment of this application is shown. Exemplarily, the control method includes S101-S102: S101, the stirring drive module 70 and the lifting drive module 50 of the mixing and sampling device work together to make the stirring module 90 move vertically and rotate around the axis at the same time, so as to perform a combined lifting and stirring motion on the liquid to be sampled, and obtain the stirred liquid.

[0032] The controller controls the stirring motor and the lifting motor, causing the stirring rod to perform a combined lifting and stirring motion on the liquid to be sampled in the container. Furthermore, before controlling the stirring rod of the mixing and sampling device to perform the combined lifting and stirring motion, such as... Figure 6 As shown, the control method also includes S201-S203: S201, acquire the liquid level height signal from the ranging module of the mixing sampling device.

[0033] A laser measuring instrument or an ultrasonic measuring instrument can be set as a ranging module to obtain the liquid level height and the position of the bottom of the container. For example, the ranging module samples at a frequency of 10–50 Hz, and the controller preprocesses the ranging signal to remove reflections from the container wall and foam interference, and calculates the estimated values ​​of the liquid level and the bottom of the container.

[0034] S202, set the lifting safety range of the stirring module 90 according to the liquid level height signal.

[0035] The estimated liquid level and the estimated bottom of the container are used as the safe range for the stirring rod to rise and fall, ensuring that the stirring rod will not touch the bottom and cause mechanical damage during the insertion of the liquid, nor will it affect the mixing effect due to shallow insertion.

[0036] Furthermore, a safety threshold can be set according to the shape of the stirring rod blades. The estimated value at the bottom of the container is increased by the corresponding threshold range, and the estimated value at the liquid level is decreased by the corresponding threshold range to re-form a safe lifting and lowering range. For example, the safety threshold is between 10-30mm, thereby leaving an overflow prevention space above the liquid level and maintaining an anti-collision distance at the bottom of the container, forming an adaptively adjustable safe operating range, which significantly improves the safety of the mixing operation.

[0037] S203, the stirring module 90 is located within the lifting safety zone.

[0038] Closed-loop control ensures that the mixing module 90 always operates within a safe range, achieving high reliability, precise positioning, and long-term stable operation of the equipment during the mixing process.

[0039] During the combined lifting and stirring motion of the stirring module 90 on the sampled liquid, if the parameters of the stirring module 90 are abnormal or the rising or falling height exceeds the safe range, the stirring module 90 will stop stirring and rise to a preset safe height. It is understood that the parameters of the stirring rod include motor current, speed, torque, and position feedback, and the threshold values ​​for each parameter and the preset safe height can be set according to the actual application. This ensures the structural safety and service life of the equipment, prevents sample contamination or container breakage, and improves the stability and safety of the system operation.

[0040] For example, in one embodiment, performing a lifting and stirring combined motion on the sampled liquid includes a first stirring stage, a second stirring stage, and a third stirring stage executed sequentially. Each stage is automatically switched according to a preset duration or a liquid flow state feedback signal, which is not limited here.

[0041] Furthermore, before the first stirring stage, the overall rotation speed range of the stirring module 90 can be set according to the viscosity of the liquid to be sampled. The viscosity of the liquid to be sampled can be obtained by setting a pressure sensing device on the blades of the stirring rod and sensing the pressure of the stirring rod. Alternatively, the viscosity of the liquid to be sampled can be obtained by manually inputting it through a human-computer interaction device. No limitation is made here.

[0042] For example, if the viscosity of the liquid to be sampled is within a first preset viscosity range, the stirring drive module 70 controls the rotation speed of the stirring module 90 to be less than a fourth preset ratio of the rated rotation speed; if the viscosity of the liquid to be sampled is within a second preset viscosity range, the stirring drive module 70 controls the rotation speed of the stirring module 90 to be greater than a fifth preset ratio of the rated rotation speed, and the upper limit of the first preset viscosity range is greater than the upper limit of the second preset viscosity range.

[0043] The first preset viscosity range, second preset viscosity range, fourth preset ratio, and fifth preset ratio can be set according to the actual application. For example, if the viscosity is within the first preset viscosity range, it is a high-viscosity liquid, and the rotation speed of the stirring rod is limited to ≤70% of the rated speed. Furthermore, the lifting and lowering amplitude of the stirring rod can be appropriately increased to avoid motor overload, reduce foam generation, and ensure thorough mixing. If the viscosity is within the second preset viscosity range, it is a low-viscosity liquid, and the rotation speed of the stirring rod is limited to ≥40% of the rated speed. Furthermore, the residence time of the stirring rod on the upper layer of the liquid can be appropriately shortened to enhance the stirring kinetics effect, improve the mixing uniformity, and increase the response speed.

[0044] The parameters for each stage of the lifting and stirring composite motion can be set according to the actual application. For example, in the first stirring stage, the stirring drive module 70 controls the rotational speed of the stirring module 90 within a first preset speed range, and the lifting drive module 50 controls the lifting amplitude of the stirring module 90 within a first preset depth range and the lifting frequency of the stirring module 90 within a first preset frequency range. In the second stirring stage, the stirring drive module 70 controls the rotational speed of the stirring module 90 within a second preset speed range, and the lifting drive module 50 controls the lifting amplitude of the stirring module 90 within a second preset depth range and the lifting frequency of the stirring module 90 within a second preset frequency range. In the third stirring stage, the stirring drive module 70 controls the rotational speed of the stirring module 90 within a third preset speed range, and the lifting drive module 50 controls the lifting frequency of the stirring module 90 within a third preset frequency range.

[0045] Among them, the upper limit of the first preset speed range is higher than the upper limit of the second preset speed range, the upper limit of the second preset speed range is higher than the upper limit of the third preset speed range, the upper limit of the second preset depth range is higher than the upper limit of the first preset depth range, and the upper limit of the second preset frequency range is higher than the upper limits of both the first and third preset frequency ranges.

[0046] Specifically, the first stage is the layer-breaking initiation stage, where the stirring speed can be increased to 60-80% of the rated speed, with an amplitude of fluctuation ≤30% of the liquid depth and a frequency of 0.1-0.3Hz. In this stage, the high speed, small amplitude of fluctuation, and low frequency quickly break down the bottom sediment layer and high-viscosity areas, achieving local flow activation. The second stage is the full-layer scanning stage, where the stirring speed can be maintained at 40-70% of the rated speed, with an amplitude of fluctuation covering 85-95% of the liquid depth and a frequency of 0.2-0.6Hz. The moderate speed maintains the shear force, while the amplitude of fluctuation is increased to near the full liquid depth and the frequency of fluctuation is increased, achieving full coverage of the stirring effect throughout the entire liquid volume, promoting global material circulation and macroscopic homogenization. The third stage is the homogenization stabilization stage, where the stirring speed can be gradually reduced to 20-40% of the rated speed, and the frequency of fluctuation is reduced to 0.1-0.2Hz, causing the flow field to decay, bubbles to be released, and the temperature rise to decrease.

[0047] This multi-stage collaborative control strategy achieves refined, phased control of the liquid sample stirring process through the time-sequential matching of rotation speed, amplitude, and frequency, significantly improving the uniformity, efficiency, and system stability of mixing. Specifically, the controller drives the stirring head to rotate via a stirring motor, generating axial upward flow and radial jet. A lifting motor controls the stirring head to vertically sweep the stirring module 90 within a safe lifting range. The superposition of rotational and lifting motions creates a closed-loop flow field inside the container, characterized by lower entrainment, middle rise, and upper fall, effectively breaking down internal liquid stratification and bottom deposition, and promoting the homogenization of viscous fluids.

[0048] Furthermore, based on the acquired liquid viscosity information, the controller dynamically determines the overall rotational speed range of the stirring rod, and adaptively limits the parameters of each stage of the entire lifting and stirring composite motion, ensuring stirring efficiency while avoiding motor overload or excessive shearing. This integrated control method takes into account the requirements of initiation layer breaking, full-range circulation, and steady-state homogenization, not only enhancing the adaptability to liquids with different physical properties, but also optimizing stirring energy consumption and flow field stability before sampling.

[0049] S102, the sampling drive module 60 of the control mixing sampling device adopts a differentiated pressure control strategy to collect liquid samples in stages after stirring, so as to obtain the target liquid sample.

[0050] Furthermore, after performing a combined lifting and stirring motion on the liquid to be sampled, a delay of 5–30 seconds can be allowed for the main circulation flow to decay and release bubbles. The weight of the liquid can be obtained by setting an electronic scale on the stage 80, and liquid collection can be carried out in stages based on the weight; alternatively, the volume of the liquid can be obtained by setting a volume detection device, and liquid collection can be carried out in stages based on the volume. Demonstratively, liquid collection in stages is carried out based on weight.

[0051] The various stages of liquid collection can be set according to the actual application scenario. For example, in one implementation, such as Figure 7 As shown, S102 includes the following sub-steps: S301, the sampling module of the mixing and sampling device is controlled by a vacuum pump to absorb the stirred liquid within a first preset pressure range until the sampling module's collection volume reaches the first preset ratio of the target collection volume.

[0052] Specifically, the second pipe 102 in the sampling bottle 100, used to connect the liquid, can be inserted to half to two-thirds of the liquid depth, maintaining a safety gap of 20–40 mm from the bottom. A hose clamp can be installed on the screw drive mechanism 20 to fix the position of the second pipe 102. A first preset pressure range and a first preset ratio can be set according to the actual application. Exemplarily, this stage is the coarse sampling stage. The controller uses a vacuum pump to make the sampling bottle 100 operate at a negative pressure of 60–100% until the weight of the collected liquid reaches 90% of the target weight to be collected.

[0053] S302, the sampling module is controlled by a vacuum pump to draw the stirred liquid within a second preset pressure range until the sampling volume of the sampling module reaches the second preset ratio of the target sampling volume, and the upper limit of the second preset pressure range is less than the upper limit of the first preset pressure range.

[0054] Exemplary, this stage is the precision sampling stage. The controller uses a vacuum pump to operate the sampling bottle 100 at a negative pressure of 20-40%, reducing fluid inertia and liquid column hysteresis effects, and achieving stable liquid replenishment until the weight of the collected liquid reaches 95% of the target weight, laying the foundation for final precise control.

[0055] S303 uses a vacuum pump to control the sampling module to sample the stirred liquid dropwise to obtain the target liquid sample.

[0056] Using short pulses, the sampling bottle 100 is controlled to inject the sample drop by drop, and the electronic scale samples at ≥10 Hz to achieve overshoot-free approximation and accurately obtain the target liquid sample.

[0057] By controlling the liquid collection process in stages, efficient and high-precision sampling is achieved from coarse sampling to fine sampling and then to precise final sampling, which significantly improves the repeatability and accuracy of liquid sampling.

[0058] Furthermore, during the liquid collection process, such as Figure 8 As shown, the control method also includes S401-S403: S401, sampling is paused when the sampling amount collected by the sampling module of the mixing sampling device reaches the third preset ratio of the target sampling amount.

[0059] As an example, sampling is stopped when the collected liquid weight reaches 98% of the target weight. This avoids overshoot caused by fluid inertia, residual droplets in the tubing, or response delays in the weighing system.

[0060] S402, after a preset delay, reacquire the data collected by the sampling module.

[0061] After a 2-second delay, the weight is acquired again, stabilizing the liquid column and balancing the gas-liquid interface within the system. This allows the electronic scale to fully respond to the actual weight, resulting in more accurate real-time measurement feedback.

[0062] S403, if the sampling quantity collected by the sampling module is less than the target sampling quantity, the sampling driving module 60 controls the sampling module to perform single-drop sampling until the target sampling quantity is reached.

[0063] If the current weight is still below the target value, the single-drop sampling mode is activated. Short vacuum pulses control the 100-drop replenishment of liquid into the sampling bottle, combined with high-frequency weighing monitoring to achieve closed-loop precise adjustment until the target sampling volume is reached. This effectively overcomes the influence of liquid surface tension, liquid residue in the pipeline, and pressure release lag on the final sampling accuracy. Through the control logic of "early pause—wait for stabilization—micro-compensation," sampling errors are significantly reduced, ensuring accurate sampling with no overshoot and high repeatability under both micro-volume and full-scale conditions.

[0064] Furthermore, after the sampling module of the mixing and sampling device samples the liquid to be sampled, the control method also includes turning off the negative pressure source of the mixing and sampling device, raising the second pipe 102 to a non-contact position of the liquid to be sampled, and sealing the open end of the sampling tube, thereby achieving soft release and avoiding back suction and dripping.

[0065] In one embodiment, a mixing and sampling device is provided, the mixing and sampling device comprising: The base 10 has casters 40 at the bottom; The lead screw drive mechanism 20 is located on one side of the base 10 and is fixed with a lifting drive module 50, a sampling drive module 60 and a stage 80 for supporting the sampling module. The crossbeam 30 has a driven end of the screw drive mechanism 20 fixedly connected to one end, and a stirring module 90 and a stirring drive module 70 provided at the other end. The stage 80 integrates a controller, which controls the stirring module 90 to perform a combined lifting and stirring motion on the liquid to be sampled through the lifting drive module 50 and the stirring drive module 70, so as to obtain the stirred liquid. The stirred liquid is then collected in stages to the sampling module through the sampling drive module 60 using a differentiated pressure control strategy to obtain the target liquid sample.

[0066] Optionally, the mixing and sampling device may also include a human-computer interaction device.

[0067] Optionally, the mixing and sampling device is a spice mixing and sampling device.

[0068] It is understood that the device in this embodiment corresponds to the control method in the above embodiments, and the options in the above embodiments are also applicable to this embodiment. The control method provided by the above embodiments can realize the function of the mixing and sampling device corresponding to this embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that, in alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0070] In addition, the functional modules or units in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0071] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a smartphone, personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0072] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A control method for a mixing and sampling device, characterized in that, Applications in mixing and sampling devices include: The stirring drive module and the lifting drive module of the mixing and sampling device are controlled to work together so that the stirring module moves vertically up and down while rotating around the axis, performing a combined lifting and stirring motion on the liquid to be sampled, and obtaining the stirred liquid. The sampling drive module controlling the mixing and sampling device uses a differentiated pressure control strategy to collect liquid samples in stages after stirring, thereby obtaining the target liquid sample.

2. The control method for the mixing and sampling device according to claim 1, characterized in that, The combined lifting and stirring motion performed on the liquid to be sampled includes a first stirring stage, a second stirring stage, and a third stirring stage performed sequentially: In the first stirring stage, the stirring drive module controls the rotation speed of the stirring module within a first preset rotation speed range, and the lifting drive module controls the lifting amplitude of the stirring module within a first preset depth range and the lifting frequency of the stirring module within a first preset frequency range. In the second stirring stage, the stirring drive module controls the rotation speed of the stirring module within a second preset rotation speed range, and the lifting drive module controls the lifting amplitude of the stirring module within a second preset depth range and the lifting frequency of the stirring module within a second preset frequency range. In the third stirring stage, the stirring drive module controls the rotation speed of the stirring module to be within a third preset rotation speed range, and the lifting drive module controls the lifting frequency of the stirring module to be within a third preset frequency range. Wherein, the upper limit of the first preset speed range is higher than the upper limit of the second preset speed range, the upper limit of the second preset speed range is higher than the upper limit of the third preset speed range, the upper limit of the second preset depth range is higher than the upper limit of the first preset depth range, and the upper limit of the second preset frequency range is higher than the upper limits of both the first and third preset frequency ranges.

3. The control method for the mixing and sampling device according to claim 1, characterized in that, The sampling drive module is a vacuum pump. The sampling drive module that controls the mixing and sampling device uses a differentiated pressure control strategy to perform staged liquid collection of the stirred liquid, obtaining the target liquid sample, including: The vacuum pump controls the sampling module of the mixing and sampling device to draw up the stirred liquid within a first preset pressure range until the sampling module's collection volume reaches a first preset ratio of the target collection volume. The vacuum pump controls the sampling module to draw up the stirred liquid within a second preset pressure range until the sampling volume reaches a second preset proportion of the target sampling volume; the upper limit of the second preset pressure range is less than the upper limit of the first preset pressure range. The sampling module is controlled by the vacuum pump to sample the stirred liquid dropwise to obtain the target liquid sample.

4. The control method for the mixing and sampling device according to claim 1, characterized in that, The sampling drive module controlling the mixing and sampling device employs a differentiated pressure control strategy to perform staged liquid collection of the stirred liquid, obtaining target liquid samples including: Sampling is paused when the sampling volume of the sampling module of the mixing sampling device reaches the third preset ratio of the target sampling volume; The sampling data from the sampling module is reacquired after a preset delay. If the amount collected by the sampling module is less than the target amount collected, the sampling driving module controls the sampling module to perform single-drop sampling until the target amount collected is reached.

5. The control method for the mixing and sampling device according to claim 1, characterized in that, The coordinated operation of the stirring drive module and the lifting drive module controlling the mixing and sampling device includes: If the viscosity of the liquid to be sampled is within a first preset viscosity range, the stirring drive module controls the rotation speed of the stirring module to be less than a fourth preset ratio of the rated rotation speed. If the viscosity of the liquid to be sampled is within a second preset viscosity range, the stirring drive module controls the rotation speed of the stirring module to be greater than a fifth preset ratio of the rated rotation speed, and the upper limit of the first preset viscosity range is greater than the upper limit of the second preset viscosity range.

6. The control method for the mixing and sampling device according to claim 1, characterized in that, Before the stirring drive module and the lifting drive module of the mixing and sampling device operate in coordination, the control method further includes: Acquire the liquid level height signal from the ranging module of the mixing sampling device; The lifting safety range of the stirring module is set according to the liquid level height signal; The stirring module is controlled to be located within the lifting safety zone.

7. The control method for the mixing and sampling device according to claim 6, characterized in that, The coordinated operation of the stirring drive module and the lifting drive module controlling the mixing and sampling device includes: If the parameters of the stirring module are abnormal or the rising or falling height of the stirring module exceeds the lifting safety range, the stirring module is controlled to stop stirring and rise to a preset safety height.

8. A mixing and sampling device, characterized in that, The mixing and sampling device includes: The base has casters at the bottom; A lead screw drive mechanism is located on one side of the base and is fixed with a lifting drive module, a sampling drive module, and a platform for supporting the sampling module. The crossbeam has a driven end of the screw drive mechanism fixedly connected to one end, and a stirring module and a stirring drive module provided at the other end. The stage integrates a controller, which controls the stirring module to perform a combined lifting and stirring motion on the liquid to be sampled through the lifting drive module and the stirring drive module to obtain the stirred liquid. The stirring drive module then uses a differentiated pressure control strategy to collect the stirred liquid in stages to the sampling module to obtain the target liquid sample.

9. The mixing and sampling device according to claim 8, characterized in that, The mixing and sampling device also includes a human-computer interaction device.

10. The mixing and sampling device according to claim 8, characterized in that, The mixing and sampling device is a spice mixing and sampling device.

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