Automatic evaporation end point control system and control method thereof

Abstract

The invention provides an evaporation end point automatic control system and a control method thereof. The evaporation end point automatic control system comprises a sample table, a weighing module, a heating module and a control module. The sample table is provided with a plurality of spaced thermal evaporation areas; the weighing module is arranged in the sample table and is used for monitoring the weight of a sample solution in an evaporation dish in a thermal evaporation area in real time and providing accurate data support for end point judgment; the heating module is arranged in the sample table and is used for heating a sample solution in a targeted manner and providing energy for an evaporation process; the control module is in communication connection with the heating module and the weighing module and used for adjusting the heating temperature, receiving the weight data and automatically stopping heating when the weight of the sample solution is lower than the target weight, and finally automatic control over the evaporation process is achieved. And an efficient and reliable technical support is provided for liquid evaporation related experiments or production scenes.

Description

Technical Field

[0001] This application relates to the field of laboratory precision instrument control technology, and in particular to an automatic control system and control method for the evaporation endpoint. Background Technology

[0002] In the fields of chemistry, pharmaceuticals, food, and environmental analysis, evaporation and concentration are among the most commonly used pretreatment or preparation steps. Currently, laboratories and small- to medium-sized production sites generally use split-type evaporation systems: the evaporation volume is recorded in real time by an independent balance or weighing module, the heater power and stirring speed are adjusted manually based on experience, and the heat source is manually cut off when it is considered to be "close to the endpoint". While this method is simple and inexpensive, it exhibits at least the following drawbacks in actual operation: First, the entire process relies on personnel on-site. Operators must constantly read weighing data, visually monitor liquid level changes, and repeatedly fine-tune parameters, resulting in high labor intensity and low efficiency. Second, the lack of a real-time closed-loop correlation between evaporation rate, heating power, and stirring speed makes it prone to localized overheating, boiling, or uneven evaporation due to parameter mismatch, affecting sample recovery rate and parallelism. Third, open platform scales or ordinary weighing sensors are subject to significant long-term drift due to combined interference from experimental platform vibration, hot air convection, and thermal radiation from the heating module, leading to distorted weighing values ​​that cannot be used as reliable endpoint criteria. Fourth, due to the lag in manual judgment, "over-evaporation" frequently occurs, resulting in minor issues like sample drying and coking, or severe issues like decomposition of effective components or damage to equipment, leading to both economic and data losses.

[0003] Therefore, the traditional split-type, manual-intervention-based evaporation control mode can no longer meet the comprehensive requirements of modern experiments for automation, precision, and safety. How to provide an automatic control system and method for the evaporation endpoint that can truly replace manual labor and balance precision and safety has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] To achieve the above objectives, a first aspect of this application provides an automatic control system for the evaporation endpoint, comprising:

[0006] The sample stage includes a sensing layer and a heating layer arranged at intervals from bottom to top, wherein the heating layer includes multiple spaced thermal evaporation zones.

[0007] A weighing module, built into the sample stage, is used to monitor the weight of the sample solution in the evaporating dish placed in the thermal evaporation zone in real time.

[0008] A heating module, built into the sample stage, is used to heat the sample solution in the evaporating dish placed in the thermal evaporation zone;

[0009] The control module is communicatively connected to both the heating module and the weighing module. It is used to adjust the heating temperature of the heating module, receive the weight data output by the weighing module, and automatically terminate the heating process of the heating module when the weight of the sample solution is detected to be lower than the target weight.

[0010] Optionally, the weighing module includes multiple weighing units corresponding one-to-one with the thermal evaporation zone. Each weighing unit includes a weight sensor and a force transmission rod. The weight sensor is disposed on the sensing layer and is communicatively connected to the control module. One end of the force transmission rod is connected to the weight sensor, and the other end extends vertically to the thermal evaporation zone, and the weight of the sample solution is acquired in real time when it is in contact with the bottom surface of the evaporation dish.

[0011] Optionally, different weight sensors are spaced apart from each other, and the distance between adjacent weight sensors is not less than 30mm.

[0012] Optionally, the other end of the force transmission rod extends vertically and penetrates the corresponding heating layer, while maintaining a gap with the heating layer in the horizontal direction.

[0013] Optionally, the gap between the force transmission rod and the heating layer in the horizontal direction is not less than 1 mm.

[0014] Optionally, the heating module includes multiple heating units that correspond one-to-one with the thermal evaporation zone. Each heating unit is built into the heating layer and is communicatively connected to the control module. The heating unit heats the evaporation dish disposed in the thermal evaporation zone through the heating layer.

[0015] Optionally, the control system further includes a magnetic stirring module, which includes multiple magnetic stirring units corresponding one-to-one with the thermal evaporation zone. Each magnetic stirring unit includes a magnetic stirrer and a magnetic stir bar. The magnetic stirrer is disposed on the heating layer and is communicatively connected to the control module. The magnetic stir bar is disposed in the evaporation dish and rotates under the magnetic control of the corresponding magnetic stirrer to stir the sample solution in the evaporation dish.

[0016] Optionally, the sample stage further includes a heat insulation layer and a shock absorption layer, wherein the shock absorption layer and the heat insulation layer are arranged sequentially from bottom to top in the vertical direction between the sensing layer and the heating layer.

[0017] Optionally, the control system further includes an alarm module, which is communicatively connected to the control module and emits different audible and visual alarms based on the different threshold ranges in which the weight of the received sample solution falls.

[0018] To achieve the above objectives, a second aspect of this application provides an automatic control method for the evaporation endpoint, including the control system described in any one of the above claims, wherein the control method includes:

[0019] The evaporating dish containing the sample solution is placed in the hot evaporation zone, and the initial weight of the sample solution is obtained using a weighing module located at the bottom of the hot evaporation zone.

[0020] Based on the initial weight of the sample solution, the evaporation endpoint of the sample solution is calculated, and the evaporation automatically stops when the sample solution reaches the evaporation endpoint in the control module.

[0021] The sample solution is heated using a heating module located at the bottom of the thermal evaporation zone until it reaches a preset temperature value.

[0022] The control module receives the actual weight of the sample solution from the weighing module in real time, determines whether the sample solution has reached the evaporation endpoint, and controls the heating module to automatically stop heating the sample solution if the sample solution has reached the evaporation endpoint.

[0023] The automatic evaporation endpoint control system and control method provided in this application have at least the following beneficial effects:

[0024] This application provides an automatic control system and method for the evaporation endpoint, including a sample stage, a weighing module, a heating module, and a control module. The sample stage utilizes a sensing layer and a heating layer spaced apart from bottom to top, with the heating layer containing multiple spaced thermal evaporation zones. This provides a stable mounting platform for each functional module and establishes the foundation for independent evaporation of multiple sample solutions. The weighing module, built into the sample stage, monitors the weight of the sample solution in the evaporation dish within the thermal evaporation zone in real time, providing accurate data support for endpoint determination. The heating module, also built into the sample stage, selectively heats the sample solution, providing energy for the evaporation process. The control module, communicatively connected to the heating and weighing modules, adjusts the heating temperature and receives weight data. Heating is automatically terminated when the sample solution weight falls below the target weight. Ultimately, this achieves automated control of the evaporation process, effectively solving the problems of inefficiency and over-evaporation associated with traditional manual monitoring. This improves evaporation accuracy and stability, providing efficient and reliable technical support for liquid evaporation-related experiments or production scenarios, and promoting the advancement of automation in this field.

[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 This is a structural block diagram of an automatic control system for the evaporation endpoint according to an embodiment of this application.

[0028] Figure 2 This is a schematic diagram of an automatic control system for the evaporation endpoint according to an embodiment of this application.

[0029] Figure 3 This is a flowchart illustrating an automatic control method for the evaporation endpoint according to an embodiment of this application.

[0030] 10 Evaporating dish; 100 Sample stage; 110 Sensing layer; 120 Heating layer; 130 Shock-absorbing layer; 140 Heat insulation layer; 200 Weighing module; 210 Weight sensor; 220 Force transmission rod; 300 Heating module; 400 Control module; 500 Magnetic stirring module; 510 Magnetic stirrer; 520 Magnetic stir bar. Detailed Implementation

[0031] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0032] According to the first aspect of this application, an automatic control system for the evaporation endpoint is provided, such as... Figure 1 and Figure 2 As shown, the control system includes a sample stage 100, a weighing module 200, a heating module 300, and a control module 400.

[0033] The sample stage 100 includes a sensing layer 110 and a heating layer 120 arranged at intervals from bottom to top. The heating layer 120 includes multiple spaced-apart thermal evaporation zones. A weighing module 200 is built into the sample stage 100 and is used to monitor the weight of the sample solution placed in the evaporation dish in the thermal evaporation zone in real time. A heating module 300 is built into the sample stage 100 and is used to heat the sample solution placed in the evaporation dish in the thermal evaporation zone. A control module 400 is communicatively connected to both the heating module and the weighing module 200. It is used to adjust the heating temperature of the heating module 300, receive the weight data output by the weighing module 200, and automatically terminate the heating process of the heating module 300 when the weight of the sample solution is detected to be lower than the target weight.

[0034] The working principle of this application is as follows: First, the weighing module 200 collects the weight data of the sample solution in real time and transmits it to the control module 400. The control module 400 then detects and judges the evaporation state of the sample solution in real time based on the weight change. Simultaneously, the control module 400 sets the heating temperature of the sample solution according to the evaporation conditions to accelerate the evaporation process in the evaporating dish. Therefore, when the control module 400 detects that the weight of the sample solution has decreased to the target weight, it immediately sends a stop heating command to the heating module 300, realizing the automatic switching of the heating module 300's start / stop state. Since the entire evaporation process of the sample solution does not require continuous manual monitoring and intervention, it not only completely frees up manpower and solves the problem of inefficiency in manual monitoring, but also avoids the problems of boiling over and uneven evaporation caused by the complexity of operating separate equipment through a closed-loop control logic of weight monitoring-data feedback-temperature control. In this study, the sensing layer 110 and heating layer 120, which are spaced apart from each other from bottom to top, further ensure the accuracy of data detection and feedback, avoid the influence of sample solution heating and evaporation process on weight detection, and ultimately achieve efficient, stable and precise control of the evaporation process, thus ensuring experimental efficiency.

[0035] In some embodiments, the weighing module 200 includes a plurality of weighing units corresponding one-to-one with the thermal evaporation zone. The plurality of weighing units refers to having at least two weighing units, and each weighing unit includes a weight sensor 210 and a force transmission rod 220. The weight sensor 210 is disposed on the sensing layer 110 and is communicatively connected to the control module 400. One end of the force transmission rod 220 is connected to the weight sensor, and the other end extends vertically to the thermal evaporation zone, acquiring the weight of the sample solution in real time while in contact with the bottom surface of the evaporation dish.

[0036] Since the evaporation module includes a pair of independent weighing units that correspond one-to-one with the thermal evaporation zone, the different thermal evaporation zones on the heating layer 120 can simultaneously monitor the weight of the sample solution in the different evaporation dishes placed on them, thereby realizing independent monitoring of the weight of different sample solutions.

[0037] Each weighing unit consists of a weight sensor 210 and a force transmission rod 220. The weight sensor 210 is located in the sensing layer 110. One end of the force transmission rod 220 is connected to the weight sensor 210, and the other end extends vertically to the bottom surface of the evaporating dish. This allows the actual weight of the sample solution in the evaporating dish to be detected in real time by the weight sensor 210 via the force transmission rod 220, and then transmitted to the control unit. The control unit communicates independently with each weight sensor 210 via an asynchronous modulator and polls every 200ms to obtain the actual weight of the sample solution in real time, thereby achieving accurate determination of the evaporation endpoint.

[0038] As an example, the weight sensors 210 of different weighing units are arranged in an array within the sensing layer 110 and are spaced apart from each other. The distance between adjacent weight sensors 210 is not less than 30mm, so as to ensure that the weight parameters detected by different weight sensors 210 do not interfere with each other, thereby ensuring the accuracy of weight detection.

[0039] Furthermore, when the other end of the force transmission rod 220 extends vertically and penetrates the heating layer 120 to contact the bottom surface of the evaporating dish, the force transmission rod 220 should also maintain a gap with the heating layer 120 in the horizontal direction to form a heat insulation cavity between the heating layer 120 and the force transmission rod 220. This reduces the heat transfer of the high temperature of the heating layer 120 to the weight sensor 210 through the force transmission rod 220, reduces the impact of temperature on the detection accuracy of the weight sensor 210, and ensures the accuracy of weight detection.

[0040] As an example, the gap between the force transmission rod 220 and the heating layer 120 in the horizontal direction is not less than 1 mm.

[0041] As an example, the gap between the force transmission rod 220 and the heating layer 120 in the horizontal direction may include, but is not limited to, filling air to form an air insulation cavity, or filling the gap with other aerogels to form an aerogel insulation cavity.

[0042] As an example, the force rod 220 is made of a material with low thermal conductivity, including but not limited to zirconia ceramic.

[0043] In some embodiments, the heating module 300 includes a plurality of heating units corresponding one-to-one with the thermal evaporation zone. Each heating unit is built into the heating layer 120 and is communicatively connected to the control module 400. The control module 400 controls the start and stop of the heating process of the sample solution placed in the evaporation dish on the thermal evaporation zone by sending heating commands to the heating units.

[0044] The heating module 300 operates on the principle of combining electric heating technology with precise control logic to achieve precise control of the sample solution heating process. Since each heating unit corresponds to a thermal evaporation zone, when the heating module sends a heating command, the circuit of the heating unit is activated, and current flows through the heating unit to generate heat. This heat is then transferred to the evaporation dish placed in the thermal evaporation zone via thermal conduction, thereby heating the sample solution inside the evaporation dish. The sample solution is gradually heated to a preset temperature value and maintained at a constant temperature to promote solvent evaporation.

[0045] As an example, the heating unit may be a heating element built into the heating layer 120, including but not limited to a heating wire or a ceramic heating element, to achieve controlled heating of the sample solution.

[0046] In some embodiments, the control system provided in this application further includes a magnetic stirring module 500 for uniformly and controllably stirring the sample solution in the evaporating dish to ensure the uniformity of the sample solution evaporation process. The magnetic stirring module 500 may include multiple magnetic stirring units corresponding one-to-one with the thermal evaporation zone, so that different thermal evaporation zones on the heating layer 120 can simultaneously achieve independent control of the stirring process of the sample solution in different evaporating dishes placed thereon.

[0047] Each magnetic stirring unit may include a magnetic stirrer 510 and a magnetic stir bar 520. The magnetic stirrer 510 is disposed within the heating layer 120 and is communicatively connected to the control module 400; the magnetic stir bar 520 is disposed within the evaporating dish. Thus, the control module 400 sends a stirring command to the magnetic stirrer 510, energizing the electromagnetic coil within the stirrer 510 and generating an alternating magnetic field. This magnetic field exerts a periodic magnetic force on the magnetic stir bar 520 placed within the evaporating dish. Because the direction of the magnetic field alternates with the change in current, the magnetic stir bar 520 rotates continuously under the drive of the magnetic force. The rotating magnetic stir bar 520 causes the sample solution within the evaporating dish to form a convection circulation, resulting in more uniform heating of the solution and preventing bumping caused by localized overheating. Simultaneously, the stirring process accelerates solvent evaporation from the solution surface, which, combined with the temperature control of the heating module 300, further improves evaporation efficiency and uniformity.

[0048] Furthermore, this application uses the control module 400 to precisely adjust the rotation speed of the magnetic stirrer 510, for example, by adjusting the stirring speed according to the evaporation stage. This allows it to adapt to sample solutions of different concentrations and viscosities, ensuring that the best stirring effect is maintained throughout the evaporation process. Together with heating control and weight monitoring, it forms a multi-parameter collaborative closed-loop control system, further improving the stability and evaporation accuracy of the system.

[0049] As an example, the magnetic stir bar 520 is typically a columnar or olive-shaped structure with a built-in permanent magnet, and is attached to the bottom center of the inner wall of the evaporating dish.

[0050] As an example, the magnetic stir bar 520 can rotate between 50 rpm and 600 rpm under the action of a magnetic field.

[0051] It should be noted that when the control unit monitors and obtains that the sample solution has reached the evaporation endpoint, that is, when the actual weight of the sample solution has decreased to the target weight, the control unit not only sends a stop heating command to the heating unit through the asynchronous modulator, but also sends a magnetic field control command to the magnetic stirrer 510, so that the speed of the magnetic stir bar 520 can be gradually reduced to a low speed value, such as 50 rpm, to ensure that the sample solution is heated evenly and to avoid local overheating that leads to bumping.

[0052] In some embodiments, the sample stage 100 further includes a heat insulation layer 140 and a shock absorption layer 130, which are arranged sequentially from bottom to top in the vertical direction between the sensing layer 110 and the heating layer 120.

[0053] Since the heating unit of the heating layer 120 generates a large amount of heat during operation, if this heat is directly conducted to the sensing layer 110 below, it will cause the precision sensors such as the weighing module 200 to be in a high-temperature environment, resulting in temperature drift of the sensors themselves and affecting the accuracy of weight monitoring. Therefore, by placing the heat insulation layer 140 between the heating layer 120 and the sensing layer 110, its core function is to block the transfer of heat from the heating layer 120 to the sensing layer 110, and reduce the heat conduction from the heating layer 120 to the sensing layer 110 through physical barrier, maintaining the temperature stability of the sensing layer 110 and ensuring that the weighing module 200 can output accurate weight data under suitable temperature conditions.

[0054] As an example, the insulation layer 140 is typically made of materials with low thermal conductivity, including but not limited to ceramics, insulation cotton, etc.

[0055] During the evaporation process, the operation of the magnetic stirring module 500 and slight vibrations in the external environment generate vibration energy. If this energy is directly transmitted to the weighing module 200, it will cause fluctuations and drifts in the weighing data, affecting the accurate capture of changes in the sample solution weight. Therefore, by placing the damping layer 130 between the heat insulation layer 140 and the sensing layer 110, the deformation of the damping layer 130 material can absorb vibration energy, reducing the impact of vibration on the sensing layer 110 and the built-in weighing module 200, and ensuring the stability of weight monitoring.

[0056] As an example, the damping layer 130 is typically made of elastic materials, including but not limited to silicone pads, spring damping structures, etc.

[0057] In some embodiments, the control system further includes an alarm module, which is communicatively connected to the control module 400 and emits different audible and visual alarms according to different threshold ranges in which the weight of the sample solution falls.

[0058] The alarm module consists of a buzzer and a three-level alarm light system with green, yellow, and red lights. It receives evaporation status commands of the sample solution through a communication connection with the control module 400. After continuously receiving the sample solution weight data transmitted by the weighing module 200, the control module 400 compares the real-time weight with the preset target weight and triggers the corresponding alarm state based on the range of the difference.

[0059] When the weight of the sample solution is greater than the preset target weight and exceeds the target weight by more than 10%, the control module 400 sends a green light command to the alarm module. At this time, the green light is constantly on and the buzzer does not work, indicating that the sample solution is in the normal evaporation stage and there is still a certain amount of liquid remaining before the endpoint.

[0060] When the weight of the sample solution is greater than the preset target weight but does not exceed 10% of the target weight, the control module 400 triggers a yellow warning light. The yellow light flashes while the buzzer emits an intermittent warning sound, reminding the operator that the evaporation process of the sample solution is nearing its end and that the operator needs to pay attention to the subsequent status.

[0061] When the weight of the sample solution falls below the preset target weight, the control module 400 activates a red alarm. The red light flashes rapidly and the buzzer sounds continuously, clearly indicating that evaporation has reached its endpoint. At this time, the control module 400 controls the corresponding heating unit to automatically stop heating and controls the magnetic stirring unit to reduce the stirring speed of the sample solution.

[0062] In summary, the automatic control system for the evaporation endpoint provided in this application includes a sample stage 100, a weighing module 200, a heating module 300, and a control module 400. The sample stage 100 utilizes a sensing layer 110 and a heating layer 120 spaced from bottom to top, with the heating layer 120 containing multiple spaced thermal evaporation zones. This provides a stable mounting platform for each functional module and establishes a foundation for the independent evaporation of multiple sample solutions. A weighing module 200 built into the sample stage 100 monitors the weight of the sample solution in the evaporation dish within the thermal evaporation zone in real time, providing accurate data support for endpoint determination. A heating module 300 built into the sample stage 100 specifically heats the sample solution, providing energy for the evaporation process. A control module 400, communicatively connected to the heating module 300 and the weighing module 200, adjusts the heating temperature and receives weight data. Heating is automatically terminated when the sample weight falls below the target weight, ultimately achieving automated control of the evaporation process. This effectively solves the problems of inefficiency and over-evaporation associated with traditional manual monitoring, improving evaporation accuracy and stability. It provides efficient and reliable technical support for liquid evaporation-related experiments or production scenarios, promoting the advancement of automation in this field.

[0063] According to a second aspect of this application, an automatic control method for the evaporation endpoint is also provided, comprising employing the control system described in any of the above embodiments. Figures 1-3 As shown, the control method includes:

[0064] S1, the evaporating dish containing the sample solution is placed in the hot evaporation zone, and the initial weight of the sample solution is obtained using the weighing module 200 located at the bottom of the hot evaporation zone.

[0065] S2, based on the initial weight of the sample solution, calculate the evaporation endpoint of the sample solution, and set the automatic evaporation stop condition when the sample solution reaches the evaporation endpoint in the control module 400.

[0066] S3, the sample solution is heated by the heating module 300 located at the bottom of the thermal evaporation zone until the sample solution is heated to the preset temperature value;

[0067] S4, the control module 400 receives the actual weight of the sample solution obtained in real time by the weighing module 200, determines whether the sample solution has reached the evaporation endpoint, and controls the heating module 300 to automatically stop heating the sample solution when the sample solution has reached the evaporation endpoint.

[0068] In some embodiments, before step S2, the method further includes the step of placing the magnetic stir bar 520 in the evaporating dish; and simultaneously or after step S3, the method further includes the step of using the magnetic stir bar 510 located at the bottom of the hot evaporation zone to apply a time magnetic field to the magnetic stir bar 520 in the evaporating dish to make the magnetic stir bar start rotating until a preset rotation speed is reached.

[0069] It should be noted that the above explanation of the automatic control system embodiment for the evaporation endpoint also applies to the automatic control method for the evaporation endpoint in this embodiment, and will not be repeated here.

[0070] In summary, the automatic control method for the evaporation endpoint provided in this application first places the evaporating dish containing the sample solution in the thermal evaporation zone and obtains the initial weight of the sample solution. Then, based on the initial weight, the evaporation endpoint is calculated and automatic stop conditions are set. Subsequently, the sample is heated to the preset temperature using the heating module 300. Finally, the control module 400 receives the actual weight feedback from the weighing module 200 in real time, determines whether the endpoint has been reached, and automatically stops heating—a continuous process that achieves fully automated control of the evaporation process from parameter setting to endpoint determination and heating start / stop. The method provided in this application not only completely eliminates the reliance on continuous manual monitoring and effectively avoids problems such as over-evaporation and uneven heating that are prone to occur during manual operation, ensuring the experimental or production accuracy of the sample solution, but also significantly improves the efficiency of evaporation operations. It supports standardized and repeatable evaporation control processes, providing a stable and reliable technical solution for fields involving liquid evaporation such as chemical experiments and industrial concentration, and promoting the improvement of automation control levels in related fields.

[0071] In the foregoing descriptions of the embodiments, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. An automatic control system for the evaporation endpoint, characterized in that, The control system includes: The sample stage includes a sensing layer and a heating layer arranged at intervals from bottom to top, wherein the heating layer includes multiple spaced thermal evaporation zones. A weighing module, built into the sample stage, is used to monitor the weight of the sample solution in the evaporating dish placed in the thermal evaporation zone in real time. A heating module, built into the sample stage, is used to heat the sample solution in the evaporating dish placed in the thermal evaporation zone; The control module is communicatively connected to both the heating module and the weighing module. It is used to adjust the heating temperature of the heating module, receive the weight data output by the weighing module, and automatically terminate the heating process of the heating module when the weight of the sample solution is detected to be lower than the target weight.

2. The control system according to claim 1, characterized in that, The weighing module includes multiple weighing units that correspond one-to-one with the thermal evaporation zone. Each weighing unit includes a weight sensor and a force transmission rod. The weight sensor is disposed on the sensing layer and is communicatively connected to the control module. One end of the force transmission rod is connected to the weight sensor, and the other end extends vertically to the thermal evaporation zone. The force transmission rod is in contact with the bottom surface of the evaporation dish and the weight of the sample solution is acquired in real time.

3. The control system according to claim 2, characterized in that, The different weight sensors are spaced apart from each other, and the distance between adjacent weight sensors is not less than 30mm.

4. The control system according to claim 2, characterized in that, The other end of the force transmission rod extends vertically and passes through the corresponding heating layer, while maintaining a gap with the heating layer in the horizontal direction.

5. The control system according to claim 4, characterized in that, The gap between the force transmission rod and the heating layer in the horizontal direction is not less than 1 mm.

6. The control system according to claim 1, characterized in that, The heating module includes multiple heating units that correspond one-to-one with the thermal evaporation zone. Each heating unit is built into the heating layer and is communicatively connected to the control module. The heating unit heats the evaporation dish disposed in the thermal evaporation zone through the heating layer.

7. The control system according to claim 1, characterized in that, The control system further includes a magnetic stirring module, which comprises multiple magnetic stirring units corresponding one-to-one with the thermal evaporation zone. Each magnetic stirring unit includes a magnetic stirrer and a magnetic stir bar. The magnetic stirrer is disposed on the heating layer and is communicatively connected to the control module. The magnetic stir bar is disposed in the evaporation dish and rotates under the magnetic force control of the corresponding magnetic stirrer to stir the sample solution in the evaporation dish.

8. The control system according to claim 1, characterized in that, The sample stage also includes a heat insulation layer and a shock absorption layer, which are arranged vertically from bottom to top between the sensing layer and the heating layer.

9. The control system according to claim 1, characterized in that, The control system also includes an alarm module, which is communicatively connected to the control module and emits different audible and visual alarms based on the different threshold ranges in which the weight of the received sample solution falls.

10. An automatic control method for the evaporation endpoint, comprising the control system described in any one of claims 1 to 9, characterized in that, The control method includes: The evaporating dish containing the sample solution is placed in the hot evaporation zone, and the initial weight of the sample solution is obtained using a weighing module located at the bottom of the hot evaporation zone. Based on the initial weight of the sample solution, the evaporation endpoint of the sample solution is calculated, and the evaporation automatically stops when the sample solution reaches the evaporation endpoint in the control module. The sample solution is heated using a heating module located at the bottom of the thermal evaporation zone until it reaches a preset temperature value. The control module receives the actual weight of the sample solution from the weighing module in real time, determines whether the sample solution has reached the evaporation endpoint, and controls the heating module to automatically stop heating the sample solution if the sample solution has reached the evaporation endpoint.

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