Accurate subpackaging equipment for hygroscopic materials and moisture-proof packaging process

Abstract

The invention relates to the technical field of material subpackaging and packaging, in particular to accurate subpackaging equipment for hygroscopic materials and a damp-proof packaging technology.The accurate subpackaging equipment for the hygroscopic materials comprises a sealed storage tank, a protective gas storage tank, a subpackaging module and a weighing module.The subpackaging module comprises a material transition bin, a rotating disc, a spiral pipeline, a rotating cover and a weighing tray; the sealed material storage tank is communicated with the material transition bin through the conveying pipeline, the protective gas storage tank is communicated with the conveying pipeline, the bottom of the material transition bin is coaxially and rotationally connected with the rotating disc, the top of the weighing tray is coaxially and rotationally connected with the rotating cover, and one end of the spiral pipeline penetrates through the rotating disc to form a feeding port. The invention aims to solve the problems of caking and loading quantity deviation caused by the fact that materials in traditional sub-packaging equipment are in contact with air for a long time and are easy to absorb moisture in the air.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material packaging, in particular to a precise packaging device for hygroscopic materials and a moisture-proof packaging process. BACKGROUND

[0002] In the packaging process of hygroscopic materials (such as traditional Chinese medicine granules, traditional Chinese medicine decoction pieces, medicinal materials, and solid material powders), there are two core technical problems: first, the solid materials are prone to clumping due to the absorption of moisture in the air, which leads to packaging precision deviation and does not meet the uniformity requirements of medicinal materials; second, the solid materials are in contact with air for too long during the packaging process, which reduces the stability and affects the safety and storage period of the medicinal materials. In view of the above problems, it is urgent to design a special device for hygroscopic materials that can realize precise metering and packaging, effectively reduce the contact between materials and air, and improve the moisture-proof packaging effect, in order to solve the problems of the prior art. SUMMARY

[0003] The purpose of the present application is to provide a precise packaging device for hygroscopic materials and a moisture-proof packaging process to solve the problem of long contact time between materials and air in traditional packaging devices, which leads to clumping due to the absorption of moisture in the air and causes packaging deviation.

[0004] To achieve the above purpose, the present application provides the following technical scheme: The precise packaging device for hygroscopic materials comprises a sealed storage tank, a protective gas storage tank, a packaging module, and a weighing module. The packaging module comprises a material transition bin, a rotating disc, a spiral pipe, a rotating cover, and a weighing tray. The sealed storage tank is connected to the material transition bin through a conveying pipeline. The protective gas storage tank is connected to the conveying pipeline. The bottom of the material transition bin is coaxially connected to the rotating disc. The top of the weighing tray is coaxially connected to the rotating cover. One end of the spiral pipe penetrates the rotating disc to form a feeding port, and the other end penetrates the rotating cover to form a discharging port. A rotatable discharging port valve is installed at the bottom end of the rotating cover corresponding to the discharging port of the spiral pipe. A switchable discharging port is provided at the bottom of the weighing tray. The weighing module is installed at the lower end of the weighing tray to weigh the weight of the weighing tray. The hygroscopic materials processed by the device are medicinal granules, tablets, or powdery solid materials with the following parameters: particle size 0.3-2.0 cm (powdery material particle size ≤0.1 cm), water content ≤8%, and bulk density 0.6-0.8 g / cm³.

[0005] Preferably, a synchronous transmission shaft is coaxially fixedly connected between the rotating disc and the rotating cover, and the synchronous transmission shaft is rotatably connected to the material transition bin.

[0006] Preferably, the inner bottom wall of the weighing tray is provided with a coaxial inverted conical structure, and a rotatable discharge port rotating valve is mounted at the bottom end of the discharge port.

[0007] Preferably, the bottom end of the rotating cover is fixedly connected with a connecting ring, and the top end of the weighing tray is provided with an annular groove, and the groove depth of the annular groove is greater than the thickness of the connecting ring.

[0008] Preferably, the weighing unit comprises a weighing base and a weighing sensor, the weighing sensor is mounted on the weighing base, a weighing connecting frame is fixedly mounted at the center of the top end of the weighing surface of the weighing sensor, and the top of the weighing connecting frame is coaxially fixed with the bottom end of the weighing tray.

[0009] Preferably, one end of the spiral pipeline penetrates through the rotating disc and is in communication with the inside of the material transition bin, and is fixedly connected with the rotating disc to form a feeding port, and the other end penetrates through the rotating cover and is in communication with the inside of the weighing tray, and is fixedly connected with the rotating cover to form a discharge port.

[0010] A moisture-proof packaging process based on the precise dispensing equipment for hygroscopic materials, comprising the following steps: A. Selecting hygroscopic medicinal solid materials (such as traditional Chinese medicine granules, traditional Chinese medicine decoction pieces, medicinal excipients, etc.) meeting the parameter requirements (particle size 0.3-2.0 cm or powder ≤0.1 cm, moisture content ≤8%, bulk density 0.6-0.8 g / cm³) and placing them in a sealed storage tank for storage; B. Before dispensing starts, continuously introduce the protective gas in the protective gas storage tank into the conveying pipeline for at least 30 seconds for pre-replacement, until the oxygen content in the equipment cavity is reduced to below 1%, to form an initial anti-hygroscopic protective atmosphere; C. Open the communication channel between the sealed storage tank and the material transition bin, and the material is pushed by gravity and the protective gas flow into the conveying pipeline and then into the material transition bin, the material falls into the weighing tray through the discharge port of the spiral pipeline, and the weighing sensor collects the weight data of the material in the weighing tray in real time; during the entire dispensing and metering process, the protective gas is continuously introduced and filled into the dispensing module at a pressure of 0.1-0.2 MPa and a flow rate of 0.5-1 L / min, to maintain an anti-hygroscopic atmosphere with an oxygen content of less than 1% in the equipment cavity; when the weight of the material in the weighing tray reaches the preset dispensing value, the discharge port rotating valve is closed; D. Open the discharge port at the bottom of the weighing tray, and use a finished product container to collect the material, and immediately seal the container after the material falls into the finished product container.

[0011] Preferably, the rotating disc is driven by the synchronous transmission shaft to rotate at a speed of 5-15 r / min, and the rotating cover and the spiral pipeline are synchronously rotated.

[0012] Compared with the prior art, the present application has the following advantages: 1. Before the sub-packaging, the oxygen content in the cavity of the device is reduced to below 1% by protective gas pre-replacement for 30s; during the sub-packaging process, the protective gas is continuously introduced at a pressure of 0.1-0.2MPa and a flow rate of 0.5-1L / min, so that the whole process of the material from storage, transportation, weighing to discharging is in a protective gas micro-positive pressure environment, greatly reducing the moisture absorption and weight gain rate of the material, avoiding material caking, and improving the sub-packaging weighing accuracy; 2. The synchronous transmission shaft drives the rotating cover and the spiral pipeline to rotate, so that the material falling point is evenly distributed in the weighing tray, and the flow guiding effect of the inverted conical bottom wall completely solves the weighing error caused by local accumulation of the material. In addition, the protective gas flow helps the material to move quickly, greatly reducing the material residue in the pipeline and the device. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a front view of the whole of the present application; Figure 2 is a front view of the sub-packaging module of the present application; Figure 3 is an enlarged view of A in the present application Figure 2 Figure 4 is a front view of the rotating disc and the rotating cover of the present application.

[0014] In the figure: 1, weighing base; 2, weighing sensor; 3, weighing connecting frame; 4, weighing tray; 5, discharging port rotary valve; 6, annular groove; 7, connecting ring; 8, rotating cover; 9, discharging port rotary valve; 10, spiral pipeline; 11, rotating disc; 12, synchronous transmission shaft; 13, material transition bin; 14, material conveying pipe; 15, sealed storage tank; 16, gas conveying pipe; 17, protective gas storage tank. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0016] Please refer to Figures 1 to 4 , the present application provides a technical solution: precise sub-packaging equipment for hygroscopic material, including sealed storage tank 15, protective gas storage tank 17, sub-packaging module, weighing base 1 and weighing sensor 2.

[0017] ​The sealing storage tank 15 is made of stainless steel, and a sealing feeding port is arranged at the top, and a sealing cover is arranged, so that the outside air and moisture are isolated. The sealing storage tank 15 is provided with a discharging port at the bottom, and is in sealing communication with the sub-packaging module through the material conveying pipe 14. The hygroscopic solid material (adapted material parameters: particle size range 0.3-2.0 cm, water content ≤8%, bulk density 0.6-0.8 g / cm³) in the tank is conveyed to the sub-packaging module through the material conveying pipe 14.

[0018] The protective gas storage tank 17 stores nitrogen or argon. The gas outlet of the protective gas storage tank 17 is in communication with the material conveying pipe 14 through the gas conveying pipe 16. A pressure reducing valve (reducing high-pressure gas to 0.1-0.2 MPa) is arranged in the middle section of the gas conveying pipe 16. A flow controller (controlling the output flow to be 0.5-1 L / min) is additionally arranged between the pressure reducing valve and the material conveying pipe 14. During the sub-packaging process, the protective gas is continuously introduced into the material conveying pipe 14 and fills the entire sub-packaging module, which not only avoids the increase in weight of the material due to moisture absorption, but also enables the material to move quickly, reduces the residual material in the pipe, and the moisture absorption rate of the material under the protection of the protective gas is ≤0.5% / h.

[0019] The sub-packaging module comprises a material transition bin 13, a rotating disc 11, a spiral pipe 10, a rotating cover 8 and a weighing tray 4.

[0020] The material transition bin 13 is in communication with the material conveying pipe 14 at the top, and is coaxially and rotatably connected with the rotating disc 11 at the bottom. The weighing tray 4 is coaxially and rotatably connected with the rotating cover 8 at the top. The rotating disc 11 and the rotating cover 8 are coaxially and fixedly connected with a synchronous transmission shaft 12. The synchronous transmission shaft 12 is rotatably connected with the material transition bin 13 and is driven by a stepping motor on the surface of the material transition bin 13, so as to synchronously drive the rotating disc 11 and the rotating cover 8 to rotate.

[0021] One end of the spiral pipe 10 penetrates through the rotating disc 11 and is in communication with the inside of the material transition bin 13, and is fixedly connected with the rotating disc 11 to form a feeding port. The other end penetrates through the rotating cover 8 and is in communication with the inside of the weighing tray 4, and is fixedly connected with the rotating cover 8 to form a discharging port. Through the above design, when the rotating disc 11 rotates, the material in the material transition bin 13 can be kept in a moving state, so as to avoid the blockage of the feeding port of the spiral pipe 10. When the rotating cover 8 rotates, the spiral pipe 10 also rotates synchronously, so that the discharging point of the discharging port is not fixed, and the material is prevented from accumulating in the weighing tray 4.

[0022] At the bottom of the rotating cover 8, corresponding to the discharge port of the spiral pipe 10, a discharge port rotary valve 9 driven by an independent stepper motor is installed to control the discharge switch of the spiral pipe 10. The inner bottom wall of the weighing tray 4 is provided with a coaxial inverted conical structure, and the bottom is set as the discharge port. At the bottom corresponding to the discharge port, a discharge port rotary valve 5 driven by a third stepper motor is installed to realize the control of finished product discharge. At the same time, the inverted conical bottom wall of the weighing tray 4 can guide the material to move towards the middle discharge port, further avoiding accumulation. Meanwhile, the material conveying path is under the protection of protective gas throughout, which greatly reduces the risk of moisture absorption and weight gain. Combined with the anti-blocking and anti-accumulation design and the weighing system, the high-precision packaging of materials is finally achieved.

[0023] The load cell 2 is installed on the weighing base 1. A weighing connecting frame 3 is fixedly installed at the top center of the weighing surface of the load cell 2. The weighing connecting frame 3 is a stainless steel frame structure. The top of the weighing connecting frame 3 is coaxially fixed with the bottom of the weighing tray 4 to weigh the material in the weighing tray 4.

[0024] The bottom of the rotating cover 8 is fixedly connected to a connecting ring 7, and the top of the weighing tray 4 is provided with an annular groove 6. The depth of the annular groove 6 is greater than the thickness of the connecting ring 7, so as to ensure that the weighing tray 4 has the range of motion to move up and down without affecting the weighing accuracy.

[0025] The rotation of the three stepper motors is started as needed by the control system. The weighing sensor 2 collects the material weight data in the weighing tray 4 in real time and transmits the data to the control system. The system uses a PLC controller as the core control unit. By comparing the preset dispensing weight with the real-time weighing data, it accurately controls the start and stop of the stepper motor that drives the rotary valve 9 at the discharge port, thereby adjusting the start and stop of the spiral pipe 10 to achieve high-precision measurement of the material quantity.

[0026] The PLC controller (model: Siemens S7-200 SMART ST40) connects to various sensors, actuators, and human-machine interface components. Sensors include a material level monitoring unit (such as a material level sensor) and a weighing sensor 2 inside the sealed storage tank 15, used to collect key data such as material level and weight in real time. Actuators include various stepper motors, solenoid valves, etc., responsible for executing control commands. The control system is equipped with a touch screen, which allows for intuitive setting and real-time monitoring of parameters such as dispensing weight, protective gas flow rate, and stepper motor speed. Through the linkage of preset parameters and sensor signals, the PLC controller can accurately coordinate the collaborative work of various modules, realizing fully automated production without manual intervention.

[0027] In practical applications, the sealed storage tank 15, material transition chamber 13, and protective gas storage tank 17 are all fixedly installed using dedicated brackets (not shown in the figure). The brackets can be flexibly adjusted in height and installation position according to the site layout, ensuring the stability of each tank and pipeline connection, preventing tank shaking from affecting material conveying and weighing accuracy, and reserving sufficient operating space for subsequent maintenance and repair of the equipment, adapting to the layout requirements of different workshops. In addition, based on the protective gas protection layout of this equipment, the gas flow structure can be adaptively modified to further ensure the stability of the moisture-proof atmosphere throughout the process (specific improvements). The method is a conventional adaptation and adjustment of the protective gas layout in this application, which will not be elaborated here): First, a small ventilation gap (≤0.1mm) can be reserved in the closed state of the discharge port rotary valve 9 and the discharge port rotary valve 5 to ensure that a small amount of protective gas can flow through and maintain a slight positive pressure in the pipeline and weighing tray 4; Second, an additional gas branch pipe can be added between the protective gas storage tank 17 and the weighing tray 4 to directly introduce protective gas into the weighing tray 4, thereby enhancing the local protection effect. The above improvements are all adaptive optimizations to the protective gas utilization method of this application and do not deviate from the core protection logic.

[0028] The moisture-proof packaging process for precision dispensing equipment for hygroscopic materials includes the following steps: Material pretreatment: The moisture content of hygroscopic solid materials to be packaged must be tested in advance to ensure that the moisture content is ≤8%. If the moisture content exceeds the standard, it must be dried at low temperature (temperature ≤45℃) before being put into use to avoid the material itself carrying water and causing subsequent moisture absorption and deterioration.

[0029] Protective gas atmosphere pre-replacement: Open the protective gas supply valve to allow the protective gas to enter the material conveying pipe 14 through the gas conveying pipe 16 and fill all the cavities through which the material flows, such as the sealed storage tank 15, the material transition chamber 13, and the weighing tray 4. Continue to replace for 30 seconds to remove the air and moisture from the cavities until the oxygen content in the cavities is ≤1%.

[0030] Protective gas-assisted conveying: When the bottom outlet of the sealed storage tank 15 is opened, the material moves to the material transition chamber 13 through the material conveying pipe 14 under the combined action of gravity and protective gas flow. The protective gas flow drives the material to flow rapidly.

[0031] Transition chamber anti-clogging and moisture absorption: Start the stepper motor that drives the synchronous transmission shaft 12 to drive the rotating disk 11 to rotate at a speed of 5-15 r / min. The rotating disk 11 keeps the material in the transition chamber 13 in an active state, avoiding blockage of the feed port of the spiral pipe 10. During this process, protective gas continuously fills the transition chamber to maintain a dry and oxygen-free environment inside the chamber.

[0032] Dynamic anti-accumulation and moisture-proof weighing tray: The synchronous drive shaft 12 rotates to drive the rotating cover 8 and the spiral pipe 10 to rotate synchronously, so that the material drop point of the spiral pipe 10 discharge port is evenly distributed in the weighing tray 4, avoiding local accumulation of materials. At the same time, the inverted conical bottom wall of the weighing tray 4 guides the material to move towards the center, further reducing retention. After the material falls into the weighing tray 4, the weighing sensor 2 collects the weight data in real time and transmits it to the PLC control system. When the weight reaches 90% of the preset value, the control system starts the stepper motor of the discharge port rotary valve 9 and gradually closes it to achieve deceleration and material discharge until the discharge port is closed. Throughout the weighing process, the weighing tray 4 always maintains a protective gas slightly positive pressure atmosphere to prevent the material from absorbing moisture and increasing its weight.

[0033] Material feeding and finished product preservation stage: When the weight of the material in the weighing tray 4 reaches the preset value, the discharge port rotary valve 9 immediately closes, and then the stepper motor of the discharge port rotary valve 5 is started to open the discharge port. Under the guidance of the inverted conical bottom wall, the material quickly falls into the finished product sealed container. The finished product container must be precisely aligned with the discharge port. After the material falls into the finished product container, the container is immediately sealed.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision dispensing device for hygroscopic materials, comprising a sealed storage tank (15), a protective gas storage tank (17), a dispensing module, and a weighing module, characterized in that, The dispensing module includes a material transition chamber (13), a rotating disk (11), a spiral pipe (10), a rotating cover (8), and a weighing tray (4). The sealed storage tank (15) is connected to the material transition chamber (13) through a conveying pipeline. The protective gas storage tank (17) is connected to the conveying pipeline. The bottom of the material transition chamber (13) is coaxially and rotatably connected to the rotating disk (11). The top of the weighing tray (4) is coaxially and rotatably connected to the rotating cover (8). One end of the spiral pipe (10) passes through the rotating disk (11) to form a feed inlet, and the other end passes through the rotating cover (8) to form a discharge outlet. A rotatable discharge outlet rotary valve (9) is installed at the bottom of the rotating cover (8) corresponding to the discharge outlet of the spiral pipe (10). The bottom of the weighing tray (4) is provided with an openable discharge outlet. The weighing module is installed at the bottom of the weighing tray (4) to weigh the weight of the weighing tray (4).

2. The precision dispensing equipment for hygroscopic materials according to claim 1, characterized in that, A synchronous drive shaft (12) is coaxially fixedly connected between the rotating disk (11) and the rotating cover (8), and the synchronous drive shaft (12) is rotatably connected to the material transition chamber (13).

3. The precision dispensing equipment for hygroscopic materials according to claim 1, characterized in that, The weighing tray (4) has a coaxial inverted conical structure on its inner bottom wall, and a rotatable discharge port rotary valve (5) is installed at the bottom end corresponding to the discharge port.

4. The precision dispensing equipment for hygroscopic materials according to claim 1, characterized in that, The bottom end of the rotating cover (8) is fixedly connected to a connecting ring (7), and the top end of the weighing tray (4) is provided with an annular groove (6), and the depth of the annular groove (6) is greater than the thickness of the connecting ring (7).

5. The precision dispensing equipment for hygroscopic materials according to claim 1, characterized in that, The weighing unit includes a weighing base (1) and a weighing sensor (2). The weighing sensor (2) is installed on the weighing base (1). A weighing connecting frame (3) is fixedly installed at the center of the top of the weighing surface of the weighing sensor (2). The top of the weighing connecting frame (3) is coaxially fixed with the bottom of the weighing tray (4).

6. The precision dispensing equipment for hygroscopic materials according to claim 1, characterized in that, One end of the spiral pipe (10) passes through the rotating disk (11) and communicates with the inside of the material transition chamber (13), and is fixedly connected to the rotating disk (11) to form a feed inlet. The other end passes through the rotating cover (8) and communicates with the inside of the weighing tray (4), and is fixedly connected to the rotating cover (8) to form a discharge port.

7. A moisture-proof packaging process based on the hygroscopic material precision dispensing equipment described in claim 1, characterized in that: Includes the following steps: A. Store the hygroscopic pharmaceutical solid material in a sealed storage container (15); B. Before the dispensing begins, the protective gas in the protective gas storage tank (17) is continuously introduced into the delivery pipeline for at least 30 seconds for pre-displacement until the oxygen content in the equipment cavity drops below 1% to form an initial moisture-proof protective atmosphere. C. Open the communication channel between the sealed storage tank (15) and the material transition chamber (13). Under the assistance of gravity and protective gas flow, the material enters the material transition chamber (13) through the conveying pipeline. The material falls into the weighing tray (4) through the discharge port of the spiral pipe (10). The weighing sensor (2) collects the weight data of the material in the weighing tray (4) in real time. During the entire dispensing and metering process, the protective gas is continuously introduced and filled into the dispensing module at a pressure of 0.1-0.2MPa and a flow rate of 0.5-1L / min to maintain a moisture-proof atmosphere with an oxygen content of less than 1% in the equipment cavity. When the weight of the material in the weighing tray (4) reaches the preset dispensing value, close the discharge port rotary valve (9). D. Open the bottom of the weighing tray (4) and use the finished product container to hold the material. After the material falls into the finished product container, immediately seal the container.

8. The moisture-proof packaging process according to claim 7, characterized in that, The drive synchronous transmission shaft (12) drives the rotating disk (11) to rotate at a speed of 5-15 r / min, and at the same time drives the rotating cover (8) and the spiral pipe (10) to rotate synchronously.

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