Two-section type liquid capsule filling and sealing system and method

Abstract

The invention belongs to the related field of two-section type liquid capsule filling and sealing technologies, and discloses a two-section type liquid capsule filling and sealing system which comprises a liquid filling unit and a sealing unit. The liquid filling unit comprises a filling main machine, a feeding module, a separating module, a smearing module, a liquid injection module, a capsule combining module and a capsule discharging module, wherein the feeding module, the separating module, the smearing module, the liquid injection module, the capsule combining module and the capsule discharging module are arranged on a working table face of the filling main machine. Capsules are sequentially transferred to the filling stations, and the liquid filling process is completed. The sealing unit comprises a sealing main machine, a feeding module, a laser welding module, a sealing discharging module and a discharging module, wherein the feeding module, the laser welding module, the sealing discharging module and the discharging module are arranged on a working table face of the sealing main machine. Capsules are sequentially transferred to the sealing stations, and the sealing process in an annular laser welding mode is completed. The invention further discloses a corresponding method. According to the invention, not only is the capsule sealing quality improved, but also the sequence transfer action of the capsule is reduced in the production transfer process, and finally, the qualified rate of liquid capsule finished products and the system efficiency are greatly improved.

Description

Technical Field

[0001] The present invention belongs to the field related to two-section liquid capsule filling technology, and more specifically, relates to a two-section liquid capsule filling system and method. Background Art

[0002] Two-section capsules are widely used in pharmaceuticals, dietary supplements, cosmetics and medical devices, but in the past they were limited to solid powder active ingredients. Oil-soluble active ingredients are currently mainly achieved in the form of compressed soft capsules.

[0003] A two-section liquid capsule has been proposed in the prior art, which can effectively fill various liquid oily ingredients and expand the application range of two-section capsule preparations. Compared with compressed soft capsules, this capsule has the characteristics of low oxygen permeability, the contents are not easily oxidized, and the odor of the contents can be concealed. At the same time, no plasticizer is added, the capsule disintegrates quickly, and it is not easy to stick. Therefore, it can effectively improve the bioavailability and is being used by more and more users in the market.

[0004] However, further research shows that the above-mentioned prior art still has the following defects or deficiencies: There are currently two main sealing methods for two-section liquid capsules, namely, inner sealing and outer sealing. The outer sealing method is to apply the sealing liquid to the outer joint of the two-section capsule by smearing; the inner sealing method is to reach the inner joint of the two-section capsule by micro-spraying, and achieve the sealing purpose in combination with hot air drying. However, the common characteristics of these two types of sealing methods are: complex procedures, long processing time, poor sealing quality, and easy leakage after long-term storage.

[0005] More specifically, regardless of whether it is inner sealing or outer sealing, the sealing process and the filling process are implemented in two separate processes. The capsules that have been filled (but not yet sealed) need to be transferred to the sealing station through a specific conveying process; during this period, the capsules that have already contained liquid will inevitably be inverted, collided and squeezed in the subsequent processes, and the liquid inside will easily leak out, contaminating the sealing area where the capsule cap and the capsule body are combined. The subsequent sealing agent cannot be effectively combined with the capsule material because the joint between the capsule body and the capsule cap has been invaded by liquid (usually oily), which may bring the risk of sealing failure, greatly affecting the marketization of the two-section liquid capsule. Summary of the invention

[0006] In response to one or more of the above defects or needs in the prior art, the present invention provides a two-section liquid capsule filling system and method, wherein research and improvements are made on the overall structural composition and the specific structure and setting methods of multiple key modules such as the coating module, laser welding module, and rotating tooling, especially the use of laser welding to perform the annular sealing of the two-section liquid capsule and further research on its sealing mechanism, which greatly improves the qualified rate of liquid capsule finished products and the system filling efficiency.

[0007] To achieve the above object, according to one aspect of the present invention, a two-stage liquid capsule filling system is provided, the system comprising a liquid filling unit and a sealing unit, characterized in that:

[0008] The liquid filling unit comprises a filling host and a feeding module, a separation module, a coating module, a liquid injection module, a capsule closing module and a capsule unloading module arranged on the working table of the filling host; wherein the feeding module is used to transport the empty two-section capsule mold to a designated position, and then the separation module performs separation of the capsule body and the capsule cap; the coating module is used to coat the sealing liquid in the gap area between the capsule body and the capsule cap to be overlapped and fitted, and form an annular thin layer of liquid film in the gap area, and then the liquid injection module injects the required amount of filling liquid into the capsule body; the capsule closing module is used to fit the capsule body and the capsule cap after liquid filling together with the sealing liquid; and the capsule unloading module is used to transport the capsule after the capsule is closed to the sealing unit;

[0009] The sealing unit includes a sealing main machine and a loading module, a laser welding module, a sealing unloading module and a discharging module arranged on the working surface of the sealing main machine, wherein the loading module is used to receive the capsules after the capsule is completed and continue to transport them to the designated position, and then the laser welding module performs annular welding sealing on the annular thin layer of liquid film in the gap area between the capsule body and the capsule cap; the sealing unloading module is used to transport the capsules that have completed laser welding sealing to the unloading place, and finally the discharging module uniformly transports them to the storage position.

[0010] As a further preference, when the laser welding module performs annular welding sealing, the laser energy is set to concentrate on the annular thin layer of liquid film, instantly causing the temperature of the annular thin layer of liquid film to rise, while simultaneously fusing the capsule body and the capsule film material at the annular thin layer of liquid film into one.

[0011] As a further preference, the liquid filling unit as a whole is preferably in a turntable structure, and its various component modules are arranged in sequence on the working surface of the filling host in a circumferential direction; the sealing unit is also in a turntable structure and is adjacent to the above-mentioned liquid filling unit, and its various component modules are arranged in sequence on the working surface of the sealing host in a circumferential direction; in addition, the capsule unloading module and the loading module are preferably arranged at the closest distance.

[0012] As a further preferred embodiment, during the entire liquid filling and sealing process, the capsule body and the capsule cap of the two-section liquid capsule are preferably maintained in a vertical posture.

[0013] As a further preference, the coating module preferably includes an coating rod, a water tank, a moving plate, a bracket and a cylinder, wherein the bracket is fixed on the table top of the liquid filling unit, the water tank is fixedly connected to the bracket and is used to store sealing liquid for coating; the coating rod is connected to the front end of the cylinder via the moving plate, thereby being able to move up and down along with the linkage of the cylinder, and correspondingly picks up the sealing liquid from the water tank when moving downward, and applies the sealing liquid to the gap area between the capsule body and the capsule cap to be overlapped and fitted when moving upward.

[0014] As a further preference, the laser welding modules are multiple in number and each laser welding module preferably includes a welding base, a fine-tuning slide and multiple lasers, wherein the multiple lasers are respectively installed on the fine-tuning slide to perform free adjustment of the spatial posture, and then are uniformly integrated on the welding base and installed on the table top of the sealing unit.

[0015] As a further preference, the above-mentioned sealing unit is preferably provided with a group of rotating tools at each workstation for carrying the capsule from one workstation to the next workstation; each of the rotating tools preferably includes a power transmission box, a pneumatic joint, a motor, a positioning cavity and a quartz ring, wherein the positioning cavity is used to place the capsule transferred thereto inside, and the motor is connected to the pneumatic joint, the power transmission box and the positioning cavity in sequence, and is used to drive the capsule to rotate in the positioning cavity; the quartz ring is used to cooperate with the laser welding module to perform annular welding sealing of the annular thin layer of liquid film between the capsule body and the capsule cap.

[0016] As a further preference, the sealing and unloading module preferably includes a servo motor, a linkage mechanism, a vacuum suction nozzle, a buffer tank and a discharge funnel, wherein the servo motor is used to drive the linkage mechanism and drive the vacuum suction nozzle to transfer the capsules that have completed laser welding and sealing to the buffer tank, and then slide into the discharge funnel through the buffer tank.

[0017] As a further preference, the liquid filling unit preferably also includes a liquid injection detection module, which is used to perform detections on the following situations: checking whether the capsule body and the capsule cap are successfully separated, whether there is a phenomenon of incomplete feeding resulting in no capsule in the mold, and whether the capsule cap and the capsule body have been placed in the upper and lower modules of the mold respectively; and when it is determined that the detection is unqualified, sending a signal so that the coating module and the liquid injection module do not work on the capsule at this time; in addition, the liquid filling unit preferably also includes a waste rejection module, which is used to reject the capsules determined to be unqualified by the liquid injection detection module from the mold; the sealing unit preferably also includes a capsule missing detection module, which is used to detect whether there are capsules in the mold.

[0018] According to another aspect of the present invention, a corresponding liquid capsule sealing method is also provided.

[0019] As a further preferred embodiment of the present invention, the capsule is preferably a liquid-filled capsule of medicine, biology or fine chemical industry.

[0020] In general, the above technical solution conceived by the present invention has the following technical advantages compared with the prior art:

[0021] (1) The present invention fully combines the processing characteristics and specific requirements of the two-section liquid capsule, redesigns the overall structural composition of its filling system, and especially adopts a circular laser welding method to perform sealing, which can greatly improve the qualified rate of liquid capsule finished products and system efficiency; more specifically, in the present invention, a sealing liquid is applied between the capsule body and the capsule cap before laser welding, so that a thin layer of liquid film can be formed in the overlapping gap area between the capsule cap and the capsule body, eliminating the air in the gap area, and when the laser is welded again, the energy is concentrated on the liquid film ring, which instantly increases the temperature of the liquid film ring area, thereby ensuring that the capsule cap and the capsule body material at the liquid film ring can be reliably fused together;

[0022] (2) The present invention further improves the specific structure and setting mode of multiple key modules such as the coating module, the rotating tooling, and the laser welding module, so that a series of operations of the liquid capsule can be completed efficiently and reliably in a compact and easy-to-control manner, and the entire process is more compact, which significantly improves the efficiency of processing and manufacturing;

[0023] (3) During the entire process of the present invention, the capsule can be kept in a vertical position until the sealing is completed; the present invention realizes more reliable online welding after the liquid capsule filling station, avoiding the leakage of the liquid preparation caused by the subsequent tumbling and falling of the capsule. The method has a small heat-affected area, good sealing quality, fast drying speed and high production efficiency. Therefore, the present invention is also suitable for filling and sealing ordinary capsules, and is particularly suitable for the rapid manufacturing and high-quality sealing requirements of two-section liquid-filled capsules. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the liquid capsule filling system provided by the present application;

[0025] Figure 2 This is a schematic diagram of the structure of a smearing module of a preferred embodiment of the present application;

[0026] Figure 3 It is a structural schematic diagram of a rotary tooling of a preferred embodiment of the present application;

[0027] Figure 4 It is a structural schematic diagram of a laser welding module of a preferred embodiment of the present application;

[0028] Figure 5 This is a structural schematic diagram of a sealing and unloading module of a preferred embodiment of the present application;

[0029] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0030] 1-liquid filling unit; 2-sealing unit; 10-filling host; 11-feeding module; 12-separation module; 13-liquid injection detection module; 14-smearing module; 141-smearing rod; 142-water tank; 143-upper top plate; 144-moving plate; 145-bracket; 146-cylinder; 15-liquid injection module; 16-waste rejection module; 17-capsule closing module; 18-capsule unloading module; 20-sealing host; 21-feeding module; 22-capsule missing detection module; 23-laser welding Module A; 24-laser welding module B; 25-sealing and unloading module; 26-discharging module; 201-rotating tooling; 231-welding base; 232-fine-tuning slide; 233-laser; 251-servo motor; 252-linkage mechanism; 253-vacuum nozzle; 254-buffer tank; 255-buffer tank fixing seat; 256-discharging funnel; 2011-power transmission box; 2022-pneumatic joint; 2013-motor; 2014-positioning cavity; 2015-quartz ring. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations or constituent elements, and do not limit one or more additional functions, operations and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components or combinations thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components or combinations thereof.

[0033] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] As analyzed in the previous "background technology" section, the common characteristics of some sealing methods in the prior art are: complex procedures, long processing time, poor sealing quality, and easy leakage during long-term storage. For this reason, the inventors of the present application considered using laser online welding to directly perform sealing. However, in actual research and development practice, it was found that although the laser welding technology is relatively mature, it cannot be directly welded to the capsule cap and the capsule body, because the capsule body and the capsule cap themselves are plastic materials with extremely small thickness and shape tolerances. After the two are fitted, they are not in close contact, but there is a gap area. If directly welded, firstly, the energy cannot be concentrated on the solid material, and secondly, the two layers of capsule material cannot form a complete circumferential annular suture band, and there will always be some gaps, causing the liquid oily preparation to leak or seep out from the inside.

[0037] To this end, this application has been specifically considered and designed. Before laser welding, the sealing liquid is applied between the capsule body and the capsule cap (it can be applied on the outer wall of the capsule body or the inner wall of the capsule cap). In this way, a thin layer of liquid film is formed in the overlapping gap area between the capsule cap and the capsule body, eliminating the air in the gap area. The laser is then welded, and the energy is concentrated on the liquid film ring, which instantly raises the temperature of the liquid film ring area, and the capsule cap and the capsule body material at the liquid film ring are fused together. In this way, not only can more reliable online welding after the liquid capsule filling station be achieved by laser, but also the leakage of liquid preparations caused by the subsequent tumbling and falling of the capsule can be avoided. This method has a small heat-affected area, good sealing quality, fast drying speed, and high production efficiency.

[0038] Figure 1 This is a schematic diagram of the overall structure of the liquid capsule filling system provided by the present application. Figure 1 To explain the present invention in more detail.

[0039] like Figure 1 As shown in the figure, the two-section liquid capsule filling system of the present invention mainly includes a liquid filling unit 1 and a sealing unit 2, wherein the liquid filling unit 1 includes a filling host 10 and a feeding module 11, a separation module 12, a smearing module 14, a liquid injection module 15, a capsule closing module 17 and a capsule unloading module 18 arranged on the working surface of the filling host 10, and the capsules are transported to the above-mentioned filling stations in turn and complete the liquid filling process.

[0040] More specifically, the feeding module 11 is used to transport the empty capsule mold to a designated position, and then the separation module 12 is used to separate the capsule body and the capsule cap; the coating module 14 is used to coat the sealing liquid in the gap area between the capsule body and the capsule cap to be overlapped and fitted, and to form a thin annular liquid film in the gap area, and then the liquid injection module 15 is used to inject the required dose of filling liquid (such as liquid medicine) into the capsule body; the capsule closing module 17 is used to fit the capsule body and the capsule cap together with the sealing liquid after the liquid filling is completed; the capsule unloading module 18 is used to transport the capsules after the capsules are closed to the sealing unit 2; in addition, the liquid filling unit 1 preferably also includes a liquid injection detection module 13 and a waste rejection module 16.

[0041] According to a preferred embodiment of the present invention, the filling host 10 preferably has a set of molds at each station, and the molds include an upper mold and a lower mold. The capsules are transported to each station in sequence along with the molds. Figure 1 As specifically shown in the figure, the feeding module 11, the separation module 12, the detection module 13, the smearing module 14, the injection module 15, the waste rejection module 16 and the capsule closing module 17 are arranged in sequence on the filling host 10 in a circumferential direction, and a group of molds including an upper mold and a lower mold are provided on each filling station, and the capsules are transported to each station in sequence along with the mold.

[0042] When performing the liquid filling operation, the empty capsule is fed into the mold at the feeding module 11, and then the filling host 10 rotates the mold to the separation module 12 to separate the capsule body and the capsule cap, and then rotates to the injection detection module 13 station to check whether there are capsule caps or capsule bodies in the upper and lower modules in the mold, and to determine whether the cap body is not successfully separated, or the material is not completely discharged, resulting in no capsules in the mold. When the injection detection module 13 passes the inspection, it rotates to the coating module 14 station to apply sealing liquid to the inner wall of the capsule cap. Then it rotates to the injection module 15 station to fill the capsule with liquid such as liquid medicine. When the detection module 13 fails the inspection, the coating module 14 and the injection module 15 do not work until they rotate to the waste rejection module 16 station to remove all the capsules in the mold hole. Then, for example, the capsule after the capsule is closed can be transported from the capsule unloading module 18 to the loading module 21 in the sealing unit 2 by vacuum adsorption.

[0043] According to another preferred embodiment of the present invention, further improvements are made to the specific structure and arrangement of the coating module.

[0044] More specifically, see Figure 2, the coating module 14 mainly includes a coating rod 141, a water tank 142, an upper top plate 143, a moving plate 144, a bracket 145, a cylinder 146, etc., wherein the bracket 145 is fixed on the table of the liquid filling component 1, the water tank 142 is fixedly connected to the bracket 145; the cylinder 146 is fixed on the bracket 145, the moving plate 144 is connected to the front end of the cylinder 146, the coating rod 141 is fixed on the moving plate 144, and the upper top plate 143 is fixed on the bracket 145. The coating rod 141 and the moving plate 144 move up and down in conjunction with the cylinder 146. The water tank 142 stores a liquid as a sealing liquid. When the coating rod 141 is at the lowest position, it is immersed in the sealing liquid. When it rises, the coating rod is stained with the sealing liquid and is smeared on the gap area between the capsule body and the capsule cap to be overlapped. In order to prevent the capsule cap from being pushed out of the upper mold by the coating rod 141, a top plate 143 is installed on the upper mold to prevent the capsule cap from being pushed up.

[0045] See again Figure 1 As for the sealing unit 2, it includes a sealing host 20 and a loading module 21, laser welding modules 23 and 24, a sealing unloading module 25 and a discharging module 26 arranged on the working surface of the sealing host 20. The capsules are sequentially transferred to the above-mentioned sealing stations and the sealing process is completed. Among them, the loading module 21 is used to receive the capsules after the capsule is completed and continue to transport them to the designated position, and then the laser welding module performs annular welding sealing on the annular thin layer of liquid film in the gap area between the capsule body and the capsule cap; the sealing unloading module 25 is used to transfer the capsules that have completed laser welding sealing to the unloading place, and finally the discharging module 26 uniformly transfers them to the storage position. In addition, the sealing unit 2 preferably also includes a capsule missing detection module 22, which is used to detect whether there are capsules in the mold. When the laser welding module 23 / 24 performs annular welding and sealing, the laser energy is set to be concentrated on the annular thin layer of liquid film, which instantly increases the temperature of the annular thin layer of liquid film and fuses the capsule body and the capsule film material at the annular thin layer of liquid film into one. In this way, not only is the online welding after the liquid capsule filling station more reliable, but also the leakage of the liquid preparation caused by the subsequent tumbling and falling of the capsule is avoided.

[0046] See also Figure 2 The loading module 21, the capsule missing detection module 22, the laser welding modules 23 and 24, the sealing unloading module 25 and the discharging module 26 are arranged circumferentially on the sealing host 20, and a set of rotating tooling 201 is provided on each sealing station for carrying capsules from one station to the next station.

[0047] According to another preferred embodiment of the present invention, further improvements are made to the specific structure and arrangement of the rotary tooling 201. Figure 3 The rotating tooling 201 preferably includes a power transmission box 2011, a pneumatic joint 2012, a motor 2013, a positioning cavity 2014 and a quartz ring 2015, wherein the positioning cavity 2014 is used to place the capsule transferred thereto inside, and the motor 2013 is sequentially connected to the pneumatic joint 2012, the power transmission box 2011 and the positioning cavity 2014, and is used to drive the capsule to rotate in the positioning cavity 2014; the quartz ring 2015 is used to cooperate with the laser welding module to perform an annular welding seal at the joint between the capsule body and the capsule cap.

[0048] Accordingly, the motor 2013 can control high-frequency start and stop, and can adjust the capsule rotation speed; by changing the specifications and models of the positioning cavity 2014 and the quartz ring 2015, the welding of capsules of different specifications can be achieved.

[0049] See also Figure 4 , the laser welding module 23 、 The number of 24 is multiple, and multiple welding stations are used to match the liquid filling efficiency. In addition, each laser welding module preferably includes a welding base 231, a fine-tuning slide 232 and a plurality of lasers 233, wherein the plurality of lasers 233 are respectively installed on the fine-tuning slide 232 to perform free adjustment of the spatial posture, and then are uniformly integrated on the welding base 231 and installed on the table of the sealing unit 2.

[0050] See also Figure 5 The sealing and unloading module 25 preferably includes a servo motor 251, a linkage mechanism 252, a vacuum suction nozzle 253, a buffer groove 254 and a discharge funnel 256, wherein the servo motor 251 is used to drive the linkage mechanism 252 and drive the vacuum suction nozzle 253 to transfer the capsules that have completed laser welding and sealing to the buffer groove 254, and then slide into the discharge funnel 256 through the buffer groove 254.

[0051] In summary, the liquid capsule filling system according to the present invention can improve the sealing quality and increase the qualified rate of liquid capsule finished products; in addition, the capsule body can be kept in a vertical state during the entire process until the sealing is completed. The present invention realizes more reliable online welding after the liquid capsule filling station, avoiding the leakage of liquid preparations caused by the subsequent tumbling and falling of the capsules. The method has a small heat-affected area, good sealing quality, fast drying speed and high production efficiency. Therefore, the present invention is also suitable for filling and sealing ordinary capsules, and is particularly suitable for rapid manufacturing and high-quality sealing requirements of two-section liquid-filled capsules, and thus has good practical value and application prospects.

[0052] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A two-stage liquid capsule filling system, comprising a liquid filling unit (1) and a sealing unit (2), characterized in that: The liquid filling unit (1) comprises a filling host (10) and a feeding module (11), a separation module (12), a smearing module (14), a liquid injection module (15), a capsule closing module (17) and a capsule unloading module (18) arranged on a work surface of the filling host (10); wherein the feeding module (11) is used to transport an empty two-section capsule mold to a designated position, and then the separation module (12) performs separation of a capsule body and a capsule cap; the smearing module (14) is used to smear a sealing liquid on a gap area between the capsule body and the capsule cap to be overlapped and fitted, and to form an annular thin layer of liquid film in the gap area, and then the liquid injection module (15) injects a required amount of filling liquid into the capsule body; the capsule closing module (17) is used to fit the capsule body and the capsule cap together with the sealing liquid after the liquid filling is completed; and the capsule unloading module (18) is used to transport the capsule after the capsule is filled to the sealing unit (2); The sealing unit (2) comprises a sealing main machine (20) and a loading module (21), a laser welding module (23, 24), a sealing unloading module (25) and a discharging module (26) arranged on a working table of the sealing main machine (20), wherein the loading module (21) is used to receive the capsules after the capsules are closed and to continue to transport them to a designated position, and then the laser welding modules (23, 24) perform annular welding sealing on the annular thin layer of liquid film in the gap area between the capsule body and the capsule cap; the sealing unloading module (25) is used to transport the capsules that have completed laser welding sealing to a discharging location, and finally the discharging module (26) uniformly transports them to a storage location.

2. The two-stage liquid capsule filling system according to claim 1, characterized in that: When the laser welding modules (23, 24) perform annular welding sealing, the laser energy is set to be concentrated on the annular thin layer of liquid film, instantly causing the temperature of the annular thin layer of liquid film to rise, while simultaneously fusing the capsule body and the capsule film material at the annular thin layer of liquid film into one.

3. The two-stage liquid capsule filling system according to claim 1 or 2, characterized in that: The liquid filling unit (1) as a whole is preferably in the form of a turntable structure, and its various component modules are arranged in sequence on the working surface of the filling main unit (10) in a circumferential direction; the sealing unit (2) is also in the form of a turntable structure and is adjacent to the liquid filling unit (1), and its various component modules are arranged in sequence on the working surface of the sealing main unit (20) in a circumferential direction; in addition, the capsule unloading module (18) and the loading module (21) are preferably arranged at the shortest distance.

4. The two-stage liquid capsule filling system according to any one of claims 1 to 3, characterized in that: During the entire liquid filling and sealing process, the capsule body and the capsule cap of the two-section liquid capsule are preferably kept in a vertical posture.

5. The two-stage liquid capsule filling system according to any one of claims 1 to 4, characterized in that: As for the coating module (14), it preferably includes a coating rod (141), a water tank (142), a moving plate (144), a bracket (145) and a cylinder (146), wherein the bracket (145) is fixed on the table of the liquid filling unit (1), and the water tank (142) is fixedly connected to the bracket (145) and is used to store the sealing liquid for coating; the coating rod (141) is connected to the front end of the cylinder (146) via the moving plate (144), so that it can move up and down along with the linkage of the cylinder, and accordingly, when moving downward, it picks up the sealing liquid from the water tank (142), and when moving upward, it coats the sealing liquid to the gap area between the capsule body and the capsule cap to be overlapped and fitted.

6. The two-stage liquid capsule filling system according to any one of claims 1 to 5, characterized in that: As for the laser welding modules (23, 24), there are multiple laser welding modules and each laser welding module preferably includes a welding base (231), a fine-tuning slide (232) and multiple lasers (233), wherein the multiple lasers (233) are respectively installed on the fine-tuning slide (232) to perform free adjustment of spatial posture, and then are uniformly integrated on the welding base (231) and installed on the table top of the sealing unit (2).

7. The two-stage liquid capsule filling system according to any one of claims 1 to 6, characterized in that: The sealing unit (2) is preferably provided with a set of rotating tools (201) at each station, which is used to carry the capsule from one station to the next station; Each of the rotating tools (201) preferably includes a power transmission box (2011), a pneumatic joint (2012), a motor (2013), a positioning cavity (2014) and a quartz ring (2015), wherein the positioning cavity (2014) is used to place the capsule transferred thereto inside it, and the motor (2013) is connected to the pneumatic joint (2012), the power transmission box (2011) and the positioning cavity (2014) in sequence, and is used to drive the capsule to rotate in the positioning cavity (2014); the quartz ring (2015) is used to cooperate with the laser welding module to perform annular welding sealing of the annular thin layer of liquid film between the capsule body and the capsule cap.

8. The two-stage liquid capsule filling system according to any one of claims 1 to 7, characterized in that: As for the sealing and unloading module (25), it preferably includes a servo motor (251), a linkage mechanism (252), a vacuum suction nozzle (253), a buffer tank (254) and a discharge funnel (256), wherein the servo motor (251) is used to drive the linkage mechanism (252) and drive the vacuum suction nozzle (253) to transfer the capsules that have completed laser welding and sealing to the buffer tank (254), and then slide into the discharge funnel (256) through the buffer tank (254).

9. The two-stage liquid capsule filling system according to any one of claims 1 to 8, characterized in that: The liquid filling unit (1) preferably further comprises a liquid injection detection module (13), which is used to perform the following detections: checking whether the capsule body and the capsule cap are successfully separated, whether there is a phenomenon of no capsule in the mold due to incomplete feeding, and whether the capsule cap and the capsule body have been placed in the upper and lower modules of the mold respectively; and when it is determined that the detection is unqualified, sending a signal so that the smearing module (14) and the liquid injection module (15) do not work on the capsule at this time; in addition, the liquid filling unit (1) preferably further comprises a waste rejection module (16), which is used to reject the capsule determined to be unqualified by the liquid injection detection module (13) from the mold; The sealing unit (2) preferably further comprises a capsule-missing detection module (22), wherein the capsule-missing detection module (22) is used to detect whether there is a capsule in the mold.

10. A two-stage liquid capsule sealing method, characterized in that: The system as claimed in any one of claims 1 to 8 is used for implementation, and the two-section liquid capsule is preferably a liquid-filled capsule of medicine, biology or fine chemical industry.

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