Powder dispensing pressure control system

Abstract

The utility model discloses a powder subpackaging pressure control system, including negative pressure subassembly, positive pressure subassembly and a plurality of first switching valve, first switching valve with subpackaging needle one one corresponding connection, first switching valve is connected with negative pressure subassembly through a first negative pressure branch respectively, be equipped with first electric control governing valve on first negative pressure branch, first switching valve is connected with second switching valve through a second negative pressure branch respectively, second switching valve is connected with negative pressure subassembly, first switching valve is connected with positive pressure subassembly through a first positive pressure branch respectively, be equipped with second electric control governing valve on first positive pressure branch, the subpackaging needle of same batch subpackaging is connected with third switching valve through a second positive pressure branch, third switching valve is connected with positive pressure subassembly. The utility model has the advantages of simple structure, convenient adjustment, be favorable to reducing material waste, make the accurate loading, improve the advantages such as clean effect.

Description

Technical Field

[0001] This utility model relates to the field of food and pharmaceutical packaging machinery and equipment, and in particular to a pressure control system for powder dispensing. Background Technology

[0002] like Figure 1 As shown, the current powder dispensing process mainly includes: creating a negative pressure inside the dispensing needle 1, using this negative pressure to draw material from the powder tray 2. Then, the dispensing needle 1 moves above the vial or other container 3, maintaining a negative pressure state throughout the movement. After positioning, the dispensing needle 1 descends and extends into the container 3, and positive pressure gas is introduced into it to blow the material into the container 3, completing the dispensing process. Finally, the dispensing needle 1 moves to the dust removal component 4 for cleaning, where positive pressure gas is introduced again to blow out any remaining small amount of material, ensuring accurate material intake for the next powder intake. After cleaning, the dispensing needle 1 returns to the powder tray 2 to draw material again, and this cycle repeats.

[0003] Existing powder dispensing systems use the same negative pressure for both powder intake and transfer. During transfer, insufficient negative pressure may cause powder leakage, leading to material waste and affecting the accuracy of the filling volume. Conversely, dispensing and needle cleaning use the same positive pressure. During needle cleaning, insufficient positive pressure may result in inadequate cleaning, affecting the next powder intake during dispensing and filling. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a pressure control system for powder dispensing that is simple in structure, easy to adjust, helps to reduce material waste, makes the filling accurate, and improves the cleaning effect.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A pressure control system for powder dispensing includes a negative pressure component, a positive pressure component, and multiple first transfer valves. Each first transfer valve is connected to a dispensing needle in a corresponding manner. Each first transfer valve is connected to the negative pressure component via a first negative pressure branch, and a first electrically controlled regulating valve is provided on the first negative pressure branch. Each first transfer valve is connected to a second transfer valve via a second negative pressure branch, and the second transfer valve is connected to the negative pressure component. Each first transfer valve is connected to the positive pressure component via a first positive pressure branch, and a second electrically controlled regulating valve is provided on the first positive pressure branch. Dispensing needles dispensed in the same batch are connected to a third transfer valve via a second positive pressure branch, and the third transfer valve is connected to the positive pressure component.

[0006] As a further improvement to the above technical solution: the first electrically controlled regulating valve and the second electrically controlled regulating valve are electro-proportional valves.

[0007] As a further improvement to the above technical solution: a first check valve is provided on the first positive pressure branch, the first check valve is located between the second electrically controlled regulating valve and the first transfer valve, and a second check valve is provided between the second positive pressure branch and the first transfer valve.

[0008] As a further improvement to the above technical solution: a throttle valve is provided on the second positive pressure branch.

[0009] As a further improvement to the above technical solution: a third one-way valve is provided on the second negative pressure branch.

[0010] As a further improvement to the above technical solution: the negative pressure assembly includes a vacuum pump and a first pressure detection component for detecting the negative pressure of the first negative pressure branch or the second negative pressure branch.

[0011] As a further improvement to the above technical solution: the positive pressure assembly includes an air source, a pressure reducing valve, and a second pressure detection component for detecting the positive pressure of the first positive pressure branch or the second positive pressure branch.

[0012] As a further improvement to the above technical solution: the first transfer valve, the second transfer valve and the third transfer valve are two-position three-way solenoid valves.

[0013] As a further improvement to the above technical solution: the pressure control system for powder dispensing also includes a control box, in which the first transfer valve, the first electrically controlled regulating valve, the second transfer valve, the second electrically controlled regulating valve and the third transfer valve are all located.

[0014] Compared with the prior art, the advantages of this utility model are: The powder dispensing pressure control system disclosed in this utility model allows for several key features. During powder intake, the negative pressure component uses a first electrically controlled regulating valve and a first transfer valve to evacuate each dispensing needle, allowing material from the powder tray to enter the needles. Adjustments are made to each first electrically controlled regulating valve to ensure consistent powder intake in each needle, eliminating inaccurate filling due to manufacturing errors. During transfer, the first electrically controlled regulating valve closes, and the second transfer valve opens. The negative pressure component continues to evacuate each dispensing needle via the second transfer valve and the first transfer valve, creating a greater negative pressure within the needles to prevent material leakage and waste. During dispensing, the first transfer valve switches its state, deactivating the negative pressure component and connecting it to the dispensing needles. The positive pressure component then uses the second electrically controlled regulating valve and the first transfer valve to deliver compressed gas to each dispensing needle, allowing material to enter the container. Each second electrically controlled regulating valve is adjusted individually to ensure that the amount dispensed by each dispensing needle is consistent, eliminating the problem of inaccurate dispensing due to manufacturing errors. During needle cleaning, the second electrically controlled regulating valve is closed and the third transfer valve is opened. The positive pressure component can deliver higher pressure compressed gas to the dispensing needles of the same batch through the third transfer valve and the first transfer valve, reducing material residue, improving cleaning effect, and avoiding the mutual interference between high-pressure compressed gas from different batches, which can cause air blockage. The structure is reasonable and effective.

[0015] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the powder packaging process involved in this utility model.

[0017] Figure 2 This is a schematic diagram of the pressure control system for powder dispensing of this utility model.

[0018] Figure 3 This is a three-dimensional structural diagram of the internal structure of the electrical control box in this utility model.

[0019] Figure 4 These are the results of the sub-assembly test of the pressure control system of the existing sub-assembly system.

[0020] Figure 5 These are the results of the sub-assembly test of the pressure control system of this utility model.

[0021] The labels in the diagram represent: 1. Filling needle; 2. Powder tray; 3. Container; 4. Dust removal component; 5. Negative pressure assembly; 51. First negative pressure branch; 511. First electrically controlled regulating valve; 52. Second negative pressure branch; 521. Third check valve; 53. Vacuum pump; 54. First pressure detection component; 6. Positive pressure assembly; 61. First positive pressure branch; 611. Second electrically controlled regulating valve; 612. First check valve; 62. Second positive pressure branch; 621. Second check valve; 622. Throttling valve; 63. Air source; 64. Pressure reducing valve; 65. Second pressure detection component; 7. First transfer valve; 8. Second transfer valve; 9. Third transfer valve; 10. Control box. Detailed Implementation

[0022] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figures 2 to 3This illustration shows an embodiment of the powder dispensing pressure control system of this utility model. The powder dispensing pressure control system of this embodiment includes a negative pressure component 5, a positive pressure component 6, and multiple first transfer valves 7. Each first transfer valve 7 is connected to a dispensing needle 1 in a one-to-one correspondence. Each first transfer valve 7 is connected to the negative pressure component 5 via a first negative pressure branch 51, and a first electrically controlled regulating valve 511 is provided on the first negative pressure branch 51. Each first transfer valve 7 is connected to a second transfer valve 8 via a second negative pressure branch 52, and the second transfer valve 8 is connected to the negative pressure component 5. Each first transfer valve 7 is connected to the positive pressure component 6 via a first positive pressure branch 61, and a second electrically controlled regulating valve 611 is provided on the first positive pressure branch 61. Dispensing needles 1 from the same batch are connected to a third transfer valve 9 via a second positive pressure branch 62, and the third transfer valve 9 is connected to the positive pressure component 6. Specifically, Figure 2 The CCP shows that the ~-numbered dispensing needle 1 is filled. Correspondingly, the first transfer valve 7 is also set to 4. During transfer, the second transfer valve 8 simultaneously controls the ~-numbered dispensing needle 1 to continue to be evacuated. ~ dispensing needles 1 are filled in the same batch. Correspondingly, the third transfer valve 9 is set to 2.

[0027] In this embodiment, the pressure control system for powder dispensing allows the negative pressure component 5 to evacuate each dispensing needle 1 via the first electrically controlled regulating valve 511 and the first transfer valve 7 during powder intake, so that the material in the powder tray 2 enters the dispensing needle 1. The powder intake in each dispensing needle 1 is kept consistent by adjusting the first electrically controlled regulating valve 511, eliminating the problem of inaccurate filling due to manufacturing errors. During transfer, the first electrically controlled regulating valve 511 is closed and the second transfer valve 8 is opened. The negative pressure component 5 can continue to evacuate each dispensing needle 1 through the second transfer valve 8 and the first transfer valve 7, creating a larger negative pressure inside the dispensing needle 1 to prevent material leakage and waste. The second transfer valve 8 can also control dispensing needles 1 at the same time, simplifying the structure and improving efficiency without affecting the filling volume of the dispensing needle 1. During dispensing, the first transfer valve 7 switches states, the negative pressure component 5 is no longer connected to the dispensing needle 1, and the positive pressure component 6 is connected to the dispensing needle 1. The positive pressure component 6 can deliver compressed gas (such as clean and dry air) to each dispensing needle 1 through the second electrically controlled regulating valve 611 and the first transfer valve 7, allowing the material in the dispensing needle 1 to enter the container 3. The amount dispensed by each of the second electrically controlled regulating valves 611 is kept consistent through adjustment, eliminating the problem of inaccurate dispensing volume caused by manufacturing errors in the dispensing needles 1. During needle cleaning, the second electrically controlled regulating valve 611 is closed and the third transfer valve 9 is opened. The positive pressure component 6 can deliver higher pressure compressed gas to the dispensing needles 1 of the same batch (all are from the same batch) through the third transfer valve 9 and the first transfer valve 7, reducing material residue, improving cleaning effect, and avoiding the mutual interference between high-pressure compressed gases from different batches, which could cause air blockage. The structure is reasonable and effective. (Comparison) Figure 4 and Figure 5 The actual test results show that, compared with the existing pressure control system, the pressure control system of this utility model significantly reduces the fluctuation range of the filling volume and significantly improves the qualified rate of powder packaging.

[0028] In a preferred embodiment, the first electrically controlled regulating valve 511 and the second electrically controlled regulating valve 611 are electro-proportional valves. Electro-proportional valves can proportionally convert continuous electrical signals into pneumatic output, achieving refined closed-loop pressure control compared to ordinary solenoid valves which only have on / off states. Compared to manual regulating valves, they offer higher automation, easier adjustment, and more flexible layout within the unit, without limitations (manual regulating valves require specific installation height and operating space for convenient manual operation).

[0029] Furthermore, in this embodiment, a first check valve 612 is provided on the first positive pressure branch 61, and the first check valve 612 is located between the second electrically controlled regulating valve 611 and the first transfer valve 7. A second check valve 621 is provided between the second positive pressure branch 62 and the first transfer valve 7. By providing the first check valve 612 and the second check valve 621, cross-contamination between the first positive pressure branch 61 and the second positive pressure branch 62 can be avoided, resulting in a simple structure and good reliability.

[0030] Furthermore, in this embodiment, a throttle valve 622 is provided on the second positive pressure branch 62 to facilitate the regulation of the flow rate of the high-pressure compressed gas in the second positive pressure branch 62.

[0031] In a preferred embodiment, a third one-way valve 521 is provided on the second negative pressure branch 52 to prevent gas from entering the first transfer valve 7 and the dispensing needle 1 through the second negative pressure branch 52.

[0032] In a preferred embodiment, the negative pressure assembly 5 includes a vacuum pump 53 and a first pressure detection component 54 (e.g., a pressure detection switch) for detecting the negative pressure in the first negative pressure branch 51 or the second negative pressure branch 52. Specifically, the vacuum pump 53 evacuates the dispensing needle 1, creating a negative pressure inside the dispensing needle 1. The first pressure detection component 54 can detect the negative pressure in the first negative pressure branch 51 and the second negative pressure branch 52 during powder suction and transfer, indirectly measuring the different negative pressure values ​​inside the dispensing needle 1 in the two processes.

[0033] In a preferred embodiment, the positive pressure assembly 6 includes a gas source 63, a pressure reducing valve 64, and a second pressure detection component 65 (e.g., a pressure detection switch) for detecting the positive pressure of the first positive pressure branch 61 or the second positive pressure branch 62. The gas source 63 provides pressurized gas, and the pressure reducing valve 64 reduces the gas pressure at the outlet of the gas source 63, allowing the pressurized gas to be used in the dispensing and needle cleaning processes (excessive gas pressure can easily cause dust generation from the powder). The second pressure detection component 65 can detect the positive pressure of the first positive pressure branch 51 and the second positive pressure branch 52 during the dispensing and needle cleaning processes, indirectly measuring the different positive pressure values ​​within the dispensing needle 1 in the two processes.

[0034] In a preferred embodiment, the first switching valve 7, the second switching valve 8, and the third switching valve 9 are two-position three-way solenoid valves. The valve state can be quickly switched by moving the valve core of the two-position three-way solenoid valve, resulting in a simple structure, high reliability, and fast response speed.

[0035] See details Figure 3In this embodiment, the pressure control system for powder dispensing also includes a control box 10, in which the first transfer valve 7, the first electrically controlled regulating valve 511, the second transfer valve 8, the second electrically controlled regulating valve 611, and the third transfer valve 9 are all located. Compared to manual regulating valves, the first electrically controlled regulating valve 511 and the second electrically controlled valve 611 have a higher degree of automation, are more convenient to adjust, and have a more flexible and unrestricted layout on the whole machine. They can shorten the length of the gas pipeline, which helps prevent the risk of gas stagnation caused by excessively long pipelines (manual regulating valves have requirements for installation height to facilitate manual operation by operators, resulting in a relatively long gas pipeline, which can easily lead to the risk of gas stagnation). At the same time, the main valve body of the system is installed in the control box 10, which makes the whole machine more integrated, more compact in structure, and of higher appearance quality.

[0036] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it 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 content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A pressure control system for powder dispensing, characterized in that: The assembly includes a negative pressure component (5), a positive pressure component (6), and multiple first transfer valves (7). Each first transfer valve (7) is connected to a dispensing needle (1) in a one-to-one correspondence. Each first transfer valve (7) is connected to the negative pressure component (5) through a first negative pressure branch (51). A first electrically controlled regulating valve (511) is provided on the first negative pressure branch (51). Each first transfer valve (7) is connected to a second transfer valve (8) through a second negative pressure branch (52). The second transfer valve (8) is connected to the negative pressure component (5). Each first transfer valve (7) is connected to the positive pressure component (6) through a first positive pressure branch (61). A second electrically controlled regulating valve (611) is provided on the first positive pressure branch (61). Dispensing needles (1) of the same batch are connected to a third transfer valve (9) through a second positive pressure branch (62). The third transfer valve (9) is connected to the positive pressure component (6).

2. The pressure control system for powder dispensing according to claim 1, characterized in that: The first electrically controlled regulating valve (511) and the second electrically controlled regulating valve (611) are electrically proportional valves.

3. The pressure control system for powder dispensing according to claim 1, characterized in that: The first positive pressure branch (61) is provided with a first check valve (612), which is located between the second electrically controlled regulating valve (611) and the first transfer valve (7). The second positive pressure branch (62) is provided with a second check valve (621) between the first transfer valve (7).

4. The pressure control system for powder dispensing according to claim 1, characterized in that: A throttle valve (622) is provided on the second positive pressure branch (62).

5. The pressure control system for powder dispensing according to claim 1, characterized in that: A third check valve (521) is provided on the second negative pressure branch (52).

6. The pressure control system for powder dispensing according to any one of claims 1 to 5, characterized in that: The negative pressure assembly (5) includes a vacuum pump (53) and a first pressure detection component (54) for detecting the negative pressure of the first negative pressure branch (51) or the second negative pressure branch (52).

7. The pressure control system for powder dispensing according to any one of claims 1 to 5, characterized in that: The positive pressure assembly (6) includes an air source (63), a pressure reducing valve (64), and a second pressure detection component (65) for detecting the positive pressure of the first positive pressure branch (61) or the second positive pressure branch (62).

8. The pressure control system for powder dispensing according to any one of claims 1 to 5, characterized in that: The first transfer valve (7), the second transfer valve (8) and the third transfer valve (9) are two-position three-way solenoid valves.

9. The pressure control system for powder dispensing according to any one of claims 1 to 5, characterized in that: It also includes a control box (10), in which the first transfer valve (7), the first electrically controlled regulating valve (511), the second transfer valve (8), the second electrically controlled regulating valve (611) and the third transfer valve (9) are all located.

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