A method for filling high-viscosity liquids

Abstract

This invention discloses a method for filling high-viscosity liquids, comprising the following steps: S1, setting the bottom filling volume, total filling volume, starting point for the filling needle's ascent, and deceleration starting point for the ascent of the filling needle into the container; S2, a lifting servo drives the filling needle to descend to the bottom of the container; S3, a filling servo drives the plunger pump to begin filling; S4, when the filling volume reaches the bottom filling volume, the lifting servo drives the filling needle to rise while filling; S5, after the total filling volume is reached, the filling servo drives the plunger pump to stop filling, and the lifting servo drives the filling needle to decelerate and rise; S6, the filling servo drives the plunger pump to draw back the liquid, and the lifting servo drives the filling needle to rise and leave the container. This invention has the advantages of convenient control curve adjustment when changing the type or volume of liquid, reducing air bubbles during filling, and improving filling accuracy.

Description

Technical Field

[0001] This invention relates to the field of food and pharmaceutical packaging technology, and specifically to a method for filling high-viscosity liquids. Background Technology

[0002] Many pharmaceuticals are injected directly into the human body, requiring strict control over the amount of medication exudate, such as in the medical aesthetics industry. Many companies have relatively weak technology in the filling of viscous pharmaceutical solutions, resulting in the following drawbacks: 1) Different servo control curves are needed when filling pharmaceutical solutions of different viscosities and volumes. This is inconvenient to adjust when changing the filling solution or volume, leading to low production efficiency; 2) Pharmaceutical solutions have a certain viscosity and elasticity. Therefore, even after the plunger pump stops running, the filling needle will still gradually decelerate and expel a certain amount of solution. If the filling needle is raised at the speed of the filling action or rapidly, the upper part of the solution will not be fully filled, and the solution will be drawn into threads, falling onto the bottle mouth or packaging material, thus causing the entire honeycomb board product to be scrapped; In addition, the following... Disadvantages: 3) During the bottom filling stage, due to the poor fluidity of the viscous liquid, it cannot be fully integrated at the bottom of the bottle after flowing out of the filling needle. If the filling needle rises at this time, it may trap air and form bubbles; 4) When drawing and filling viscous liquid, it has a certain viscosity and elasticity. When drawing out the liquid, it will not immediately flow and fill the entire pipeline. A certain amount of vacuum bubbles will be formed in the pipeline. After the plunger pump finishes drawing out the liquid, the liquid will still flow. If filling is carried out at this time, it will inevitably cause air bubbles to remain in the pipeline, resulting in poor filling accuracy. When the air bubbles flow out at the end of the filling needle, they will also cause liquid to hang and string. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a high-viscosity liquid filling method that is convenient for adjusting the control curve when changing the type or volume of the liquid, reduces the generation of air bubbles during filling, and improves the filling accuracy.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A method for filling high-viscosity liquids includes the following steps:

[0006] S1. Set the bottom filling volume, total filling volume, starting point of needle rise, and deceleration starting point of the filling container;

[0007] S2. The lifting servo drive lowers the filling needle to the bottom of the container being filled;

[0008] S3. The filling servo drives the plunger pump to start filling;

[0009] S4. When the filling volume reaches the bottom filling volume, the lifting servo drive drives the filling needle to rise while filling;

[0010] S5. After the total filling volume is reached, the filling servo drives the plunger pump to stop filling, and the lifting servo drives the filling needle to decelerate and rise.

[0011] S6. The filling servo-driven plunger pump draws back the medicine, and the lifting servo-driven filling needle rises and leaves the filling container.

[0012] As a further improvement to the above technical solution: In step S2, when the drug is drawn for the first time, the plunger pump starts to draw the drug and the injection needle descends.

[0013] As a further improvement to the above technical solution: after the rotary servo-driven rotary valve is rotated to the inlet, the pumping speed of the plunger pump accelerates from 0 to the set speed and then pumps the drug at a constant speed.

[0014] As a further improvement to the above technical solution: after the plunger pump finishes drawing the medicine, it stops and waits for time t, then rotates the servo-driven rotary valve to the outlet to start discharging the liquid.

[0015] As a further improvement to the above technical solution: In step S3, after the rotary valve is rotated to the liquid outlet, the filling container is evacuated.

[0016] As a further improvement to the above technical solution: after the vacuum inside the filling container reaches a set value, the plunger pump begins filling.

[0017] As a further improvement to the above technical solution, it also includes step S7: after the liquid is drawn back, the lifting servo drives the filling needle to accelerate upward and leave the filling container.

[0018] As a further improvement to the above technical solution: In step S7, after the filling needle decelerates and rises, there is a static waiting time t1. The filling servo drives the plunger pump to start back suctioning the liquid. After the liquid back suction is completed, there is a static waiting time t2. The lifting servo then drives the filling needle to rise again.

[0019] As a further improvement to the above technical solution: in step S1, the bottom filling volume and total filling volume of the filling container, the starting point of the filling needle rise and the starting point of deceleration rise can be adjusted according to the type of drug solution; in step S3, the rotation speed of the rotary valve and the filling speed of the plunger pump can be adjusted according to the type of drug solution.

[0020] As a further improvement to the above technical solution: in step S5, the injection needle stops rising and remains stationary close to the liquid surface.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The high-viscosity liquid filling method disclosed in this invention allows for setting the bottom filling volume and total filling volume of the filling container according to the different viscosity and volume of the liquid. This enables the determination of the starting point of the filling needle's ascent (i.e., reaching the bottom filling volume) and the deceleration starting point (i.e., reaching the total filling volume) during the filling process. Since the starting point (starting point of ascent) and the ending point (deceleration starting point of ascent) of this stroke are set, it is convenient to adjust the control curves of the lifting servo (not shown in the figure) and the filling servo during this stroke, thereby improving production efficiency. At the same time, after reaching the total filling volume, the filling needle continues to decelerate and rise, allowing the liquid flowing in the filling needle to be completely filled before drawing back the liquid, ensuring the total filling volume while avoiding liquid stringing. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the application system of the high-viscosity liquid filling method of the present invention.

[0024] Figure 2 This is a flowchart of the first filling process of the high-viscosity liquid filling method of the present invention.

[0025] Figure 3 This is a stroke time diagram of the cam drive of the transfer valve, plunger pump and filling needle in the high viscosity liquid filling method of the present invention.

[0026] The labels in the diagram represent: 1. Container to be filled; 2. Filling needle; 3. Plunger pump; 4. Filling servo; 5. Rotary valve; 6. Rotation servo. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Figures 1 to 3 An embodiment of the present invention is shown, which describes a high-viscosity liquid filling method, comprising the following steps:

[0029] S1. Set the bottom filling volume, total filling volume, starting point for the filling needle 2 to rise, and starting point for deceleration.

[0030] S2, The lifting servo drive lowers the filling needle 2 to the bottom of the filling container 1;

[0031] S3, Filling servo 4 drives plunger pump 3 to start filling;

[0032] S4. When the filling volume reaches the bottom filling volume, the lifting servo drives the filling needle to rise while filling.

[0033] S5. After the total filling volume is reached, the filling servo 4 drives the plunger pump 3 to stop filling, and the lifting servo drives the filling needle 2 to decelerate and rise.

[0034] S6, the filling servo 4 drives the plunger pump 3 to draw back the medicine, and the lifting servo drives the filling needle 2 to rise and leave the filling container 1.

[0035] This high-viscosity liquid filling method sets the bottom filling volume and total filling volume of the filling container 1 according to the viscosity and volume of the liquid. First, the filling needle 2 descends to the bottom of the filling container 1 and stops, and begins to fill the bottom. After the bottom filling volume is reached, the filling needle 2 rises while filling to reduce air bubbles in the bottom filling. After the total filling volume is reached, the plunger pump 3 stops filling and the filling needle 2 decelerates and rises. Although the plunger pump 3 stops filling, a certain amount of liquid will still flow out of the filling needle 2. Therefore, the filling needle 2 decelerates and rises, which can ensure that the liquid in the upper part is completely filled and also prevent the liquid from being drawn into a thread due to the excessive rising speed of the filling needle 2, which would fall onto the bottle mouth or packaging material and avoid the scrapping of the entire honeycomb board. After the filling needle 2 decelerates and stops, the liquid in the filling needle 2 also stops flowing. At this time, the plunger pump 3 draws back the liquid to ensure the total filling volume. Finally, the filling needle 2 rises and leaves the filling container 1, completing the filling.

[0036] This high-viscosity liquid filling method allows for setting the bottom filling volume and total filling volume of the container to be filled according to the different viscosity and volume of the liquid. This enables the determination of the starting point of the filling needle 2's upward movement during filling (i.e., reaching the bottom filling volume) and the starting point of the deceleration upward movement (i.e., reaching the total filling volume). Since the starting point (starting point of the upward movement) and the ending point (deceleration upward movement) of this stroke are set, it is convenient to adjust the control curves of the lifting servo (not shown in the figure) and the filling servo 4 during this stroke, thereby improving production efficiency. At the same time, after reaching the total filling volume, the filling needle 2 continues to decelerate and rise, so that the flowing liquid in the filling needle 2 is completely filled before the liquid is drawn back, ensuring the total filling volume while avoiding liquid stringing.

[0037] Furthermore, in this embodiment, during step S2, when the first drug is drawn, the plunger pump 3 starts drawing the drug and the filling needle 2 descends. As the filling needle 2 descends to the bottom of the filling container 1, the plunger pump 3 starts drawing the drug to prepare for filling, shortening the preparation time and improving production efficiency.

[0038] Furthermore, in this embodiment, after the rotary servo 6 drives the rotary valve 5 to rotate to the inlet, the pumping speed of the plunger pump 3 accelerates from 0 to the set speed and then pumps the drug at a constant speed.

[0039] Furthermore, in this embodiment, after the plunger pump 3 completes its drug extraction, it stops and waits for time t. Then, the servo 6 drives the rotary valve 5 to rotate to the outlet to begin dispensing. Because viscous liquids have a certain viscosity and elasticity during extraction and filling, highly viscous liquids do not immediately flow and fill the entire pipeline during extraction. Vacuum air bubbles will form in the pipeline. Moreover, after the plunger pump 3 completes its drug extraction, the liquid will still flow. If filling is performed at this time, air bubbles will inevitably remain in the pipeline, ultimately leading to poor filling accuracy. When air bubbles flow out from the end of the filling needle 2, they will also cause liquid residue and stringing. Therefore, the waiting time t allows the liquid to fill the pipeline, slows down the flow of the liquid, and avoids the formation of vacuum air bubbles, which would affect subsequent filling.

[0040] Furthermore, in this embodiment, in step S3, after the rotary valve 5 is rotated to the outlet, a vacuum is drawn into the container 1 to be filled. Drawing a vacuum into the container 1 to be filled prevents the formation of air bubbles, and drawing a vacuum after the rotary valve 5 is rotated to the outlet can create a certain flow force at the filling end of the medicine, assisting in the dispensing of the medicine.

[0041] Furthermore, in this embodiment, after the vacuum inside the filling container 1 stabilizes to a set value, the plunger pump 3 begins filling. This prevents air bubbles from forming at the bottom during filling.

[0042] Furthermore, in this embodiment, step S7 is also included: after the liquid is drawn back, the lifting servo drives the filling needle 2 to accelerate upward and leave the filling container 1. The accelerated upward movement of the filling needle 2 separates from the liquid, which can effectively prevent the liquid from being drawn into threads and falling onto the bottle mouth or packaging material, thus protecting the production environment.

[0043] Further, in this embodiment, in step S7, after the filling needle 2 decelerates and rises, it remains stationary for a waiting time t1. The filling servo 4 drives the plunger pump 3 to start drawing back the liquid. After the liquid is drawn back, the filling needle 2 remains stationary for a waiting time t2. Then, the lifting servo drives the filling needle 2 to rise again. The plunger pump 3 stops filling, and the liquid in the filling needle 2 continues to flow out. The filling needle 2 rises slowly while closely adhering to the liquid surface, ensuring that the liquid in the latter part of the filling process does not trap gas and form bubbles, nor does it cause the filling needle 2 to stick to the liquid. When the flow rate of the liquid in the filling needle 2 tends to stop, the filling needle 2 stops rising and remains stationary for a waiting time t1 to ensure that the liquid in the filling needle 2 is completely stationary. The plunger pump 3 draws back the liquid to ensure the total filling volume. After the drawing back is completed, the filling needle 2 remains stationary for a waiting time t2 before rising again to avoid the formation of bubbles during the drawing back process, which would affect the filling accuracy.

[0044] Furthermore, in this embodiment, in step S1, the bottom filling amount and total filling amount of the filling container 1, as well as the starting point of the filling needle 2 and the deceleration starting point, can be adjusted according to the type of medicine, making adjustment convenient; in step S3, the rotation speed of the rotary valve 5 and the filling speed of the plunger pump 3 can be adjusted according to the type of medicine, protecting the servo motor and preventing it from overheating and being damaged.

[0045] Furthermore, in this embodiment, in step S5, the filling needle 2 stops rising and remains stationary close to the liquid surface. This avoids the siphon effect from affecting filling accuracy.

[0046] The following is based on Figure 3 For example, the travel time of the filling servo 4 (curve A), the lifting servo (not shown in the figure, curve B), and the rotation servo 6 (curve C) will be explained in detail:

[0047] A1. Plunger pump 3 starts pumping medicine; A2. Plunger pump 3 completes pumping medicine; A3. Vacuuming of container 1 is completed, and plunger pump 3 begins filling the bottom of the bottle; A4. Bottom filling volume reached; A5. Total filling volume reached; A6. Back suction completed;

[0048] B1. Filling needle 2 begins to descend; B2. Filling needle 2 reaches the bottom of the bottle; B3. Filling needle 2 begins to rise; B4. Filling needle 2 reaches the stop position of plunger pump 3, i.e., the deceleration and rising position; B5. Filling needle 2 reaches the filling end position; B6. Filling needle 2 returns to the initial position;

[0049] C1. Rotary valve 5 begins to rotate; C2. Rotary valve 5 reaches the outlet; C3. Rotary valve 5 begins to rotate; C4. Rotary valve 5 reaches the inlet.

[0050] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A method for filling high-viscosity liquids, characterized in that: Includes the following steps: S1. Set the bottom filling volume, total filling volume, starting point of the filling needle (2) and the deceleration starting point of the filling container (1). S2, The lifting servo drives the filling needle (2) to descend to the bottom of the filling container (1); S3, The filling servo (4) drives the plunger pump (3) to start filling; S4. When the filling volume reaches the bottom filling volume, the lifting servo drives the filling needle (2) to rise while filling. S5. After the total filling volume is reached, the filling servo (4) drives the plunger pump (3) to stop filling, and the lifting servo drives the filling needle (2) to decelerate and rise. S6. The filling servo (4) drives the plunger pump (3) to draw back the medicine, and the lifting servo drives the filling needle (2) to rise and leave the filling container (1).

2. The high-viscosity liquid filling method according to claim 1, characterized in that: In step S2, when the drug is drawn for the first time, the plunger pump (3) starts to draw the drug and the injection needle (2) descends.

3. The high-viscosity liquid filling method according to claim 2, characterized in that: After the rotary servo (6) drives the rotary valve (5) to rotate to the inlet, the pumping speed of the plunger pump (3) accelerates from 0 to the set speed and then pumps the drug at a constant speed.

4. The high-viscosity liquid filling method according to claim 3, characterized in that: After the plunger pump (3) finishes drawing the medicine, it stops and waits for time t. Then, the rotating servo (6) drives the rotary valve (5) to rotate to the outlet to start discharging the liquid.

5. The method for filling high-viscosity liquids according to any one of claims 1 to 4, characterized in that: In step S3, after the rotary valve (5) is rotated to the liquid outlet, the vacuum is drawn on the filling container (1).

6. The high-viscosity liquid filling method according to claim 5, characterized in that: After the vacuum inside the filling container (1) reaches the set value, the plunger pump (3) starts filling.

7. The method for filling high-viscosity liquids according to any one of claims 1 to 4, characterized in that: It also includes step S7, after the liquid is drawn back, the lifting servo drives the filling needle (2) to accelerate upward and leave the filling container (1).

8. The high-viscosity liquid filling method according to claim 7, characterized in that: In step S7, after the filling needle (2) decelerates and rises, it waits for t1. The filling servo (4) drives the plunger pump (3) to start back suctioning the liquid. After the liquid is back suctioned, the filling needle (2) waits for t2. The lifting servo then drives the filling needle (2) to rise again.

9. The method for filling high-viscosity liquids according to any one of claims 1 to 4, characterized in that: In step S1, the bottom filling volume and total filling volume of the filling container (1), the starting point of the filling needle (2) and the deceleration starting point can be adjusted according to the type of medicine liquid; in step S3, the rotation speed of the rotary valve (5) and the filling speed of the plunger pump (3) can be adjusted according to the type of medicine liquid.

10. The method for filling high-viscosity liquids according to any one of claims 1 to 4, characterized in that: In step S5, the injection needle (2) stops rising and remains stationary close to the liquid surface.

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