Laboratory automatic sand bath heating high temperature reaction device

Abstract

The application discloses a laboratory automatic sand bath heating high-temperature reaction device, and belongs to the technical field of laboratory automation equipment. The device aims to solve the problems of limited heating temperature, low thermal efficiency, uneven temperature, medium residue on the outer wall of the reactor interfering with subsequent detection, slow temperature response and the like existing in the water bath, oil bath or air bath heating mode in the prior art. The technical scheme of the application comprises: a main body having a first cavity and a second cavity in communication; a bearing assembly for bearing a reactor; a heating element for heating a heat-conducting granular medium; a pushing mechanism for pushing the heat-conducting granular medium from the second cavity to the first cavity to wrap the reactor; a power assembly for driving the pushing mechanism; and a position sensor for detecting whether the reactor is in place. The application automatically wraps or peels off the reactor by the pushing mechanism with the solid heat-conducting granular medium, realizes efficient and uniform heating, rapid temperature response and a clean and residue-free reaction process.

Description

Technical Field

[0001] This invention relates to the field of laboratory heating equipment technology, and in particular to an automatic laboratory sand bath heating high-temperature reaction device. Background Technology

[0002] In chemical or biological analysis, high-temperature catalytic reactions are often required to meet analytical needs. Currently, laboratory methods for achieving high-temperature reactions mainly fall into three categories: water baths, oil baths, and air baths. Water bath heating temperatures are limited by the boiling point of water, typically controlled between 98°C and 99°C, and are only suitable for analytical processes where the maximum reaction temperature does not exceed 95°C. Oil bath heating temperatures can reach 260°C, but there is a safety hazard of fire due to oil leakage during high-temperature operation. Air baths suffer from insufficient contact between the heat transfer medium and the reactor, low heat transfer efficiency, and uneven heating temperatures, and are only suitable for small-volume reactors. Furthermore, after water bath and oil bath heating, water or oil residues may remain on the reactor's outer wall. For subsequent spectral or visual identification detection, the reactor's outer wall must be cleaned; otherwise, residual liquids can interfere with the detection and affect the accuracy of the analytical data.

[0003] Chinese Patent Publication No. CN217068936U discloses an adjustable electric sand bath, comprising: a bottom working box; a side-mounted sand-pushing working box fixedly connected to one side of the upper surface of the bottom working box; a side-mounted sand-accumulating working box fixedly connected to the side of the upper surface of the bottom working box away from the side-mounted sand-pushing working box; and side-mounted heating working boxes fixedly connected to both sides of the upper surface of the bottom working box away from the side-mounted sand-pushing and side-mounted sand-accumulating working boxes. A control display panel is provided on the outer wall of the side-mounted sand-pushing working box away from the side-mounted sand-accumulating working box. This application, through the cooperation of the side-mounted sand-pushing and side-mounted sand-accumulating working boxes, can control the height of the sand inside the device, thereby reducing the workload of workers and improving their safety during operation.

[0004] The existing technology still has the following problems: Although using solid sand as a heat transfer medium can avoid liquid residue, as discrete particles, the distribution of sand will change due to factors such as thermal expansion and gravitational settling during the heating process, resulting in unstable contact with the reactor and thus affecting the heat transfer efficiency. Summary of the Invention

[0005] Therefore, the present invention provides an automatic sand bath heating high-temperature reaction device for laboratories, which avoids the technical problems of low heating efficiency, slow temperature response, safety hazards, and easy generation of media residue on the outer wall of the reactor that interfere with subsequent detection in the prior art of laboratory heating devices.

[0006] To achieve the above objectives, the present invention provides a laboratory automated sand bath heating high-temperature reaction device, comprising: a main body including a first chamber for accommodating a reactor and a second chamber for accommodating a thermally conductive particulate medium, the first chamber communicating with the second chamber to allow the thermally conductive particulate medium to move from the second chamber to the first chamber; a support assembly disposed within the first chamber for supporting the reactor at a predetermined position; a heating element disposed on the main body for heating the thermally conductive particulate medium contained in the second chamber; a lifting mechanism disposed within the second chamber and configured to lift the thermally conductive particulate medium from the second chamber to the first chamber to enclose the reactor; a power assembly connected to the lifting mechanism for providing a controllable driving force to the lifting mechanism according to a control signal; and a position sensor configured to detect whether the reactor is placed on the support assembly.

[0007] Furthermore, the lifting mechanism includes: a pusher plate, located within the second chamber and adapted to apply a thrust to the thermally conductive particulate medium; and a linear drive member, connected to the pusher plate, for driving the pusher plate to move along a predetermined path. This structural design makes the lifting action of the thermally conductive particulate medium more stable and reliable.

[0008] Optionally, the linear drive component is a lead screw, and the power component is a servo motor or a stepper motor connected to the lead screw. Using a servo motor or stepper motor to drive the lead screw enables precise position and speed control during the lifting process.

[0009] In one embodiment, the supporting component is a stirring base, which integrates a rotating electromagnetic coil to drive a stir bar placed inside the reactor to rotate. This design integrates heating and stirring functions, enabling thorough mixing of the reaction solution while heating, thereby improving reaction efficiency and uniformity.

[0010] Furthermore, the device also includes: a temperature sensor for monitoring the temperature of the thermally conductive particulate medium; and a push position detector for detecting whether the push mechanism has moved to a preset wrapping position or a falling position. The inclusion of these sensors provides a foundation for achieving closed-loop precise control, ensuring the accuracy and repeatability of the reaction conditions.

[0011] Optionally, the horizontal projected profile of the support component is smaller than the bottom profile of the reactor it supports. This design helps the thermally conductive particulate medium to smoothly slide back into the second chamber from the edge of the support component when the lifting mechanism descends, avoiding residue on the support component and ensuring cleanliness for the next operation.

[0012] In one embodiment, the heating element is a PTC heating block or a high-frequency heating coil disposed on the outer periphery of the main structure. A suitable heating element is selected based on different temperature requirements; for example, a PTC heating block is suitable for medium- and high-temperature scenarios, while a high-frequency heating coil can achieve ultra-high-temperature heating above 600°C, thus broadening the applicability of the device.

[0013] Optionally, the position sensor is a photoelectric through-beam sensor. This non-contact detection method is highly reliable and can accurately determine whether the reactor is placed in the correct position, which is a key prerequisite for starting an automated process.

[0014] Furthermore, the power assembly, based on the detection that the reactor is in the predetermined position, drives the lifting mechanism to operate; the lifting mechanism pushes the preheated thermally conductive particulate medium from the heating element from the second chamber to the first chamber, so that the thermally conductive particulate medium envelops the reactor for heating; and based on the completion of the reaction, the lifting mechanism is driven to move in the opposite direction, so that the thermally conductive particulate medium falls back to the second chamber under the action of gravity, realizing the separation from the reactor. This automated process design realizes unmanned operation of the reactor heating and cooling process.

[0015] Furthermore, the stir bar within the reactor performs stirring based on the heat-conducting particulate medium surrounding the reactor. By simultaneously heating and stirring, uniform temperature and concentration within the reaction system are ensured, thereby improving the reaction rate and product selectivity.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Achieves efficient and uniform heating and rapid temperature control. The solid thermally conductive granular medium is tightly wrapped around the reactor through a lifting mechanism, resulting in a large contact area and heat transfer efficiency far exceeding that of an air bath, while also ensuring uniform heating. Simultaneously, the solid granular medium has a low specific heat capacity, leading to rapid heating and cooling rates, enabling the device to respond quickly to temperature changes and achieve precise multi-stage temperature control.

[0017] 2. Improved automation and cleanliness of the experimental process. Once the reactor is in position, the device automatically completes the entire process of medium encapsulation heating and automatic peeling off after the reaction, without manual intervention. Because the thermally conductive particulate medium is a dry solid, it can completely separate from the reactor wall after the reaction, leaving no residue and eliminating the need for subsequent cleaning steps. This makes it particularly suitable for spectral or visual inspection processes with high cleanliness requirements.

[0018] 3. Enhanced operational safety. This invention uses solid particles as the heat transfer medium, fundamentally eliminating the safety hazard of fire caused by oil leakage in traditional oil baths, making the high-temperature reaction process safer and more reliable.

[0019] 4. Wide Applicability. This invention features two heating modes: PTC + thermally conductive sand and high-frequency coil + metal particles, covering a heating range of 50~600℃, achieving a wider range and higher upper limit for temperature control. For high-temperature heating conditions of 260~600℃, the high-frequency coil + metal particle heating scheme is adopted. This scheme can achieve higher heating temperatures, while also possessing higher heat transfer efficiency and faster temperature response speed. This makes the device exhibit excellent performance in terms of reaction volume adaptation, multi-stage temperature adjustment, temperature control accuracy, and response time. Attached Figure Description

[0020] Figure 1 This is an exploded view of the overall structure of the laboratory automatic sand bath heating high-temperature reaction device described in this invention; Figure 2 This is a schematic diagram of the external assembly of the laboratory automatic sand bath heating high-temperature reaction device described in this invention; Figure 3 This is a cross-sectional view of the internal cavity structure of the main body described in this invention; Figure 4 This is a schematic diagram of the lifting mechanism and bearing component structure described in this invention.

[0021] In the figure: 1. Main body; 2. Reactor; 3. Thermally conductive particulate medium; 4. Bearing component; 5. Heating element; 6. Lifting mechanism; 7. Power component; 8. Position sensor; 9. Temperature sensor; 10. Lifting position detector; 11. First chamber; 12. Second chamber; 41. Rotating electromagnetic coil; 61. Push plate; 62. Linear drive component; 71. Coupling. Detailed Implementation

[0022] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0025] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Please see Figures 1-4 As shown, Figure 1 This is an exploded view of the overall structure of the laboratory automatic sand bath heating high-temperature reaction device described in this invention; Figure 2 This is a schematic diagram of the external assembly of the laboratory automatic sand bath heating high-temperature reaction device described in this invention; Figure 3 This is a cross-sectional view of the internal cavity structure of the main body described in this invention; Figure 4 This is a schematic diagram of the lifting mechanism and supporting component structure of the present invention, illustrating an automated laboratory sand bath heating high-temperature reaction device. The device includes: a main body 1, a supporting component 4, a heating element 5, a lifting mechanism 6, a power component 7, and a position sensor 8. The main body 1 forms the frame structure of the entire device, internally divided into two interconnected spaces: a first chamber 11 for accommodating the reactor 2 and a second chamber 12 for accommodating the thermally conductive particulate medium 3. This interconnected design is fundamental to enabling the thermally conductive particulate medium 3 to circulate between the two chambers. The supporting component 4 is located at the bottom of the first chamber 11, its function being to support the reactor 2 at a preset, precise position, providing a reference for subsequent automated operation. The heating element 5 is located on the main body 1, its function being to preheat or heat the thermally conductive particulate medium 3 contained in the second chamber 12, providing the necessary heat for the reaction. The lifting mechanism 6 is located within the second chamber 12 and is configured to push the heated thermally conductive granular medium 3 from the lower second chamber 12 to the upper first chamber 11 when heating is required, thereby forming a tight enclosure of the reactor 2 and achieving efficient heat transfer. The power assembly 7 is connected to the lifting mechanism 6 and receives signals from the control system to provide precise and controllable driving force to the lifting mechanism 6. The position sensor 8 is used to detect whether the reactor 2 is accurately placed on the support assembly 4. This is the trigger condition for starting the entire automated heating process, ensuring that subsequent enclosure and heating actions can only be performed after the reactor 2 is safely in place, greatly improving the operational safety of the system.

[0027] In one specific implementation, such as Figure 1As shown, the lifting mechanism 6 includes a pusher plate 61 and a linear drive member 62. The pusher plate 61 is located at the bottom of the second chamber 12, and its shape and size match the cross-section of the second chamber 12, enabling it to effectively apply an upward thrust to the heat-conducting particulate medium 3. The linear drive member 62 is connected to the pusher plate 61, and its function is to drive the pusher plate 61 to move stably and precisely back and forth along a predetermined vertical path. With this structure, the pusher plate 61 can smoothly push the heat-conducting particulate medium 3 in the entire second chamber 12 upward as a whole, or smoothly lower it after heating, achieving precise control of the wrapping and peeling process.

[0028] To achieve higher precision motion control, as a preferred embodiment, the linear drive 62 can be a lead screw structure. Correspondingly, the power assembly 7 is preferably a servo motor or stepper motor connected to the lead screw. Figure 1 As shown, the power assembly 7 (a servo motor in this embodiment) is connected to the end of the linear drive 62 (a lead screw in this embodiment) via a coupling 71. When the power assembly 7 rotates, its rotational motion is converted into the linear vertical motion of the push plate 61 through the lead screw and nut pair. Since the servo motor or stepper motor itself has high-precision angle control capabilities, this combination allows the pushing height, speed, and acceleration of the push plate 61 to be precisely controlled, thereby achieving fine adjustment of the degree to which the heat-conducting particulate medium 3 envelops the reactor 2, as well as a smooth transition during start-up and shutdown, avoiding impact on the equipment.

[0029] To improve the mixing uniformity of the reaction system while heating, in a preferred embodiment of the present invention, the supporting component 4 is designed as a multifunctional stirring base. For example... Figure 1 As shown, the supporting component 4 integrates a rotating electromagnetic coil 41. These coils are designed to generate a rotating magnetic field when energized. When the magnetic stir bar placed inside the reactor 2 senses this rotating magnetic field, it rotates accordingly, thereby stirring the solution inside the reactor 2. This design cleverly integrates the supporting function with the stirring function, allowing heating and stirring to occur simultaneously, greatly improving reaction efficiency and the uniformity of temperature distribution, which is especially important for experiments requiring precise control of reaction conditions.

[0030] To achieve fully automated closed-loop control of the entire process, this embodiment may further include a temperature sensor 9 and a push-position detector 10. The temperature sensor 9 monitors the temperature of the heat-conducting particulate medium 3 in real time and feeds the temperature data back to the control system, thereby enabling precise PID regulation of the power of the heating element 5 and ensuring that the reaction process proceeds under the set constant temperature conditions. The push-position detector 10 detects the movement status of the push-position mechanism 6, for example, whether the push plate 61 has moved to the preset wrapping position that can completely wrap the reactor 2, or whether it has completely fallen back to the standby position. Through the signal from the push-position detector 10, the control system can confirm the completion status of the wrapping and peeling actions, thereby achieving precise control of the actions.

[0031] To address the potential residue issue of the thermally conductive particulate medium 3 during its descent, the horizontal projection dimension of the support component 4 in this embodiment is intentionally designed to be smaller than the bottom outline dimension of the reactor 2 it supports. For example, the diameter of the support component 4 can be 2-5 mm smaller than the bottom diameter of the reactor 2. This creates an annular gap between the support component 4 and the bottom edge of the reactor 2. When the lifting mechanism 6 descends and the thermally conductive particulate medium 3 falls back under gravity, particles that might have remained on the surface of the support component 4 will not be able to stay due to this size difference and will smoothly slide back into the second chamber 12. No additional cleaning components are required; the cleanliness of the surface of the support component 4 is ensured solely through structural optimization, avoiding interference with subsequent reactor placement and improving the reliability of automated operation.

[0032] The heating method of this invention is highly flexible and can be configured according to different reaction temperature requirements. The thermally conductive particulate medium 3 can be selected from solid particulate materials such as thermally conductive sand or metal particles, depending on different heating temperature and heat transfer efficiency requirements. In one embodiment, the heating element 5 is a PTC heating block disposed on the outer periphery of the main body 1 structure. The PTC heating block has self-limiting temperature characteristics, high safety, and is very suitable for medium- and low-temperature conventional chemical or biological reactions requiring heating temperatures between 50°C and 200°C. In another embodiment requiring higher temperatures, the heating element 5 can be a high-frequency heating coil. When a high-frequency current passes through the coil, an alternating magnetic field is generated, causing the metal particles (such as steel shot) serving as the thermally conductive particulate medium 3 to generate eddy currents or hysteresis losses, thus generating their own heat. This method has extremely high heating efficiency. For high-temperature heating conditions ranging from 260℃ to 600℃, the combination of this high-frequency heating coil and metal particles can not only achieve a higher upper limit of heating temperature, but also has a faster temperature response speed and higher heat transfer efficiency. This makes the device exhibit excellent performance in terms of reaction volume adaptation, multi-stage temperature adjustment and temperature control accuracy, thus meeting the needs of special application scenarios such as high-temperature catalysis and material synthesis.

[0033] To reliably detect whether reactor 2 is in position, the position sensor 8 is preferably a photoelectric through-beam sensor. This sensor consists of a transmitter and a receiver, mounted on the upper part of the first chamber 11, on both sides of the reactor 2's placement path. When reactor 2 is correctly placed on the support assembly 4, its body blocks the light path, preventing the receiver from receiving a signal, thus determining that reactor 2 is in position. This non-contact detection method avoids mechanical wear, has a fast response time, and high reliability, making it ideal for use in automated systems requiring frequent reactor handling.

[0034] In this embodiment, the entire process is precisely scheduled by the control system: First, the power unit 7 activates the lifting mechanism 6 only after the position sensor 8 detects that the reactor 2 has been placed in the predetermined position. Then, the lifting mechanism 6 pushes the thermally conductive particulate medium 3, preheated to a set temperature by the heating element 5, upwards from the second chamber 12 to the first chamber 11, until the thermally conductive particulate medium 3 completely and tightly envelops the lower half of the reactor 2, initiating the heating reaction. After the reaction process ends or a preset time is reached, the control system drives the power unit 7 to move in the opposite direction, causing the lifting mechanism 6 to descend. The thermally conductive particulate medium 3 quickly falls back to the second chamber 12 under gravity, thus achieving instantaneous separation from the reactor 2 and completing the heating process.

[0035] During the heating process, the coordinated execution of stirring is crucial to ensuring reaction quality. Specifically, while the heat-conducting particulate medium 3 surrounds and heats the reactor 2, the rotating electromagnetic coil 41, located within the support assembly 4 (in this embodiment, a stirring base), is also activated, driving the stir bar within the reactor 2 to rotate. This simultaneous heating and stirring ensures that the temperature gradient within the reaction liquid is minimized and promotes thorough mixing of the reactants, thereby increasing the reaction rate and product yield, and guaranteeing the uniformity and reproducibility of the experimental results.

[0036] To more clearly illustrate the technical solution of the present invention, a detailed description is provided below in conjunction with specific embodiments.

[0037] In a basic embodiment, the device can be configured as a manually operated apparatus to support the minimum protection scope of claim 1. Figures 1 to 3As shown, the device comprises a main body 1 made of aluminum, with an upper first chamber 11 and a lower second chamber 12. A simple circular platform, serving as a support assembly 4, is fixed to the bottom of the first chamber 11. A set of resistance wires, serving as heating elements 5, is tightly wound around the outer wall of the main body 1, and the temperature is controlled by a simple thermostat. The lifting mechanism 6 consists of a push plate 61 and a rocker mechanism connected to it, which serves as a simplified form of both a linear drive and a power assembly. A microswitch, serving as a position sensor 8, is mounted next to the support assembly 4. In operation, the user first places the reactor 2 on the support assembly 4, presses the microswitch 8, and illuminates the indicator light. Then, the user manually cranks the rocker, driving the push plate 61 upward, pushing the pre-stored and heated thermally conductive particulate medium 3 (e.g., quartz sand) from the second chamber 12 to the first chamber 11 until it covers the lower part of the reactor 2. After the reaction is complete, the user cranks the rocker in the opposite direction to lower the push plate 61, causing the thermally conductive particulate medium 3 to fall back, allowing the reactor 2 to be removed. Although this embodiment is manual, it fully embodies the core concept of using a lifting mechanism to encapsulate and heat solid particulate media.

[0038] In a preferred embodiment designed for fully automated control, the lifting mechanism 6 is upgraded to a sophisticated electromechanical system. Specifically, the power unit 7 employs a servo motor connected via a coupling 71 to a ball screw serving as a linear drive element 62. The push plate 61 is fixed to the nut on the screw. The precise rotational control of the servo motor allows for a lifting position accuracy of 0.1 mm for the push plate 61. Furthermore, the device includes a lifting position detector 10 (e.g., two Hall effect sensors or photoelectric switches) for detecting the upper and lower limit positions of the push plate 61, and a K-type thermocouple (serving as a temperature sensor 9) for measuring the temperature of the thermally conductive particulate medium 3. The position detection of the reactor 2 is performed by a photoelectric through-beam position sensor 8 mounted above the first chamber 11. All these electronic control components are connected to a PLC or microcontroller control system, enabling fully automated operation from reactor placement detection to automatic wrapping heating, temperature control, and automatic peeling through a preset program.

[0039] Another progressive embodiment focuses on the stirring function defined in claims 4 and 10. In this embodiment, the support component 4 is embodied as a stirring base made of PEEK (polyetheretherketone) material. PEEK material was chosen because it has excellent thermal insulation and magnetic permeability below 300°C, effectively isolating the heat from the heating part from the drive mechanism below, while not interfering with the magnetic field. At the top of the support component 4, four sets of rotating electromagnetic coils 41 wound with copper wire are symmetrically installed, each pair of coils forming a rotating magnetic pole. The control system generates a stepped rotating magnetic field by sequentially applying direct current to these two pairs of coils in a specific sequence, thereby driving the magnetic stir bar in the reactor 2 to rotate at a set speed. During the heating process, the stirring process is started synchronously to ensure that the reaction liquid remains fully mixed throughout the high-temperature reaction.

[0040] A further progressive embodiment details the anti-residue structure as defined in claim 6. For example... Figure 2 and Figure 3 As shown, the diameter of the support component 4 is precisely designed to be 3mm smaller than the bottom diameter of the reactor 2 it supports. The thermally conductive particulate medium 3 used in this embodiment is spherical quartz sand that has been screened and polished, with a uniform particle diameter of 2mm, exhibiting good flowability. When the reaction ends and the pusher plate 61 descends, the quartz sand surrounding the reactor 2 falls downwards and towards the center under gravity. Due to the smaller diameter of the support component 4, a 1.5mm wide annular channel exists between the bottom of the reactor 2 and the edge of the support component 4. Quartz sand particles with a diameter of 2mm cannot stably remain on the narrow upper surface of the support component 4 and will immediately slide down into the lower second chamber 12. This design, which relies purely on geometric differences to achieve self-cleaning, is simple in structure and extremely effective, ensuring the cleanliness of the support surface before each experiment begins.

[0041] Another embodiment illustrates application scenarios for the different heating methods described in claim 7. In Scheme 1, for most organic synthesis or enzymatic reactions, the required temperature is typically below 200°C. In this case, the heating element 5 can be four PTC heating blocks, which are uniformly fixed around the outer wall of the aluminum body 1. In Scheme 2, for scenarios requiring high-temperature pyrolysis, inorganic material calcination, or metal catalytic reactions, the temperature may reach 600°C or even higher. In this case, the heating element 5 uses a high-frequency heating coil, wound around the outside of the body 1 made of special ceramic or quartz. The heat-conducting particulate medium 3 is selected from steel grit with good magnetic permeability or high-temperature resistant alumina particles. By adjusting the power and frequency of the high-frequency power supply, rapid heating and ultra-high temperature control can be achieved, greatly expanding the application range of this automated device.

[0042] To more fully illustrate the preferred embodiments of the present invention, a complete embodiment integrating all the above-described preferred technical features and its automated workflow will be described below in conjunction with all the accompanying drawings. The main body 1 of the device is made of aluminum alloy with good thermal conductivity. The supporting component 4 is a PEEK stirring base with a diameter 4 mm smaller than the bottom diameter of a standard 50 mL reactor 2. The heating element 5 is a set of PTC heating blocks, designed for a maximum operating temperature of 200°C. The thermally conductive particulate medium 3 is rounded, non-angular quartz sand with a diameter of 2 mm. The lifting mechanism 6 consists of a power component 7 (servo motor), a coupling 71, a linear drive component 62 (ball screw), and a push plate 61. The device is equipped with a photoelectric through-beam position sensor 8, two Hall switches as lifting position detectors 10, and a K-type thermocouple inserted into the sand pile in the second chamber 12 as a temperature sensor 9.

[0043] like Figure 4 As shown, the complete automated workflow of this device is as follows: First, in step S101, an external automated robotic arm grabs a reactor 2 containing reactants and precisely places it on the support assembly 4.

[0044] Next, in step S102, the position sensor 8 detects that the body of the reactor 2 is blocking the light path, confirms that the reactor 2 has been placed in place, and sends a ready signal to the main control system.

[0045] In step S103, after receiving the signal, the control system immediately starts the power assembly 7, driving the lifting mechanism 6 to push the thermally conductive particulate medium 3, which has been preheated to 150°C by the heating element 5, upward from the second chamber 12 until it completely covers the lower half of the reactor 2. The upper Hall switch (lifting position detector 10) is triggered, confirming that the covering action is complete.

[0046] Subsequently, in step S104, the apparatus begins heating and stirring. Temperature sensor 9 continuously monitors the temperature of the heat-conducting particulate medium 3, and the control system adjusts the power of heating element 5 using a PID algorithm to stabilize the temperature at 150±0.5℃. Simultaneously, the rotating electromagnetic coil 41 within the support assembly 4 is activated, driving the stir bar within reactor 2 to rotate at a speed of 300 rpm.

[0047] After the preset reaction time (e.g., 30 minutes) ends, the control system executes step S105, driving the power component 7 to rotate in the opposite direction, so that the push plate 61 descends smoothly.

[0048] In step S106, the thermally conductive particulate medium 3 rapidly falls back into the second chamber 12 under the action of gravity, completely separating from the reactor 2. The lower-level Hall switch is triggered to confirm that the separation is complete.

[0049] Finally, in step S107, the control system notifies the external robotic arm, which then retrieves the reactor 2 after the reaction is complete and delivers it to the next analysis or cooling station. The entire process requires no human intervention, achieving full automation of the chemical reaction heating step.

[0050] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A laboratory automatic sand bath heating high-temperature reaction device, characterized in that, include: The main body includes a first chamber for accommodating a reactor and a second chamber for accommodating a thermally conductive particulate medium, the first chamber being in communication with the second chamber to allow the thermally conductive particulate medium to move from the second chamber to the first chamber; A support assembly disposed within the first chamber for supporting the reactor at a predetermined position; A heating element, disposed on the main body, is used to heat the thermally conductive particulate medium contained in the second chamber; A lifting mechanism is disposed within the second chamber and configured to lift the thermally conductive particulate medium from the second chamber to the first chamber to enclose the reactor; A power assembly, connected to the lifting mechanism, is used to provide a controllable driving force to the lifting mechanism according to a control signal; A position sensor configured to detect whether the reactor is placed on the support assembly.

2. The apparatus according to claim 1, characterized in that, The lifting mechanism includes: A pusher plate, located within the second chamber and adapted to apply thrust to the thermally conductive particulate medium; and A linear drive unit, connected to the push plate, is used to drive the push plate to move along a predetermined path.

3. The apparatus according to claim 2, characterized in that, The linear drive component is a lead screw, and the power component is a servo motor or a stepper motor connected to the lead screw.

4. The apparatus according to claim 1, characterized in that, The supporting component is a stirring base, which integrates a rotating electromagnetic coil to drive the stir bar placed inside the reactor to rotate.

5. The apparatus according to claim 1, characterized in that, Also includes: A temperature sensor is used to monitor the temperature of the thermally conductive particulate medium; as well as A push position detector is used to detect whether the push mechanism has moved to a preset package position or a fall position.

6. The apparatus according to claim 1, characterized in that, The horizontal projected profile dimension of the supporting component is smaller than the bottom profile dimension of the reactor it supports.

7. The apparatus according to claim 1, characterized in that, The heating element is a PTC heating block or a high-frequency heating coil disposed on the outer periphery of the main structure.

8. The apparatus according to claim 1, characterized in that, The position sensor is a photoelectric through-beam sensor.

9. The apparatus according to claim 1, characterized in that, The power unit drives a lifting mechanism to operate based on the detection that the reactor is in the predetermined position. The lifting mechanism pushes the preheated thermally conductive particulate medium from a second chamber to a first chamber, so that the thermally conductive particulate medium encapsulates the reactor for heating. The reaction ends and the lifting mechanism is driven to move in the opposite direction, causing the thermally conductive particulate medium to fall back into the second chamber under the action of gravity, thereby achieving separation from the reactor.

10. The apparatus according to claim 1, characterized in that, The stirrer inside the reactor performs stirring action based on the heat-conducting particulate medium surrounding the reactor and heating it.

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