A filling valve

Abstract

The utility model relates to a liquid material filling technology field especially relates to a filling valve. Filling valve includes and fills the department of injecting material part, because the bottom of injection barrel is provided with the liquid discharge port, and the cleaning liquid enters into the injection barrel and fills the cylinder to clean the injection barrel and fills the cylinder, and then opens the liquid discharge port to discharge the washed cleaning liquid, and further realizes the purpose of cleaning to the filling valve. In addition, the filling cylinder and the injection barrel are communicated, the cleaning liquid can flow in the filling cylinder and the injection barrel, and then the injection barrel and the filling cylinder are cleaned at the same time, the use amount of cleaning liquid is reduced, and the piston main body of the filling piston is applied to the plugging material outlet or material inlet, when plugging the material outlet, the injection piston moves upwards and sucks the material into the injection cylinder in the negative pressure mode from the material inlet, the filling piston blocks the material inlet, the injection piston moves downwards and extrudes the material into the filling container from the material outlet, and the purpose of internal cleaning is realized.

Description

Technical Field

[0001] This utility model relates to the field of liquid filling technology, and in particular to a filling valve. Background Technology

[0002] A filling machine is a device used to fill materials into packaging containers. It is commonly used for filling various beverages, edible oils, and some daily chemical products. Precise control of the filling volume is crucial to ensure the correct liquid level or weight within the container. Plunger-type filling valves can precisely control the filling volume and are suitable for high-viscosity, easily crystallizing, and solid particle-containing materials. However, plunger-type filling valves need to be cleaned before changing filling materials to prevent later-filled materials from mixing with previously filled materials. Utility Model Content

[0003] One aspect of this utility model is to provide a filling valve to facilitate cleaning of the inside of the filling valve.

[0004] A filling valve is provided, comprising:

[0005] The injection section includes an injection cylinder and an injection piston. The injection piston is located inside the injection cylinder and can move relative to the injection cylinder. The bottom of the injection cylinder is provided with a drain port.

[0006] A filling unit includes a filling cylinder and a filling piston. The filling piston includes a first valve stem and a first piston body. The first valve stem is connected to the first piston body, and the first piston body is located inside the filling cylinder. The filling cylinder is in communication with the injection cylinder. The filling cylinder has a material inlet and a material outlet. The material inlet is located above the material outlet, and the first piston body is located between the material inlet and the material outlet. The connection between the filling cylinder and the injection cylinder is higher than the material outlet but lower than the material inlet. The piston body of the filling piston can selectively block the material outlet or the material inlet to selectively connect the connection between the filling cylinder and the injection cylinder with the material outlet or the material inlet.

[0007] As an optional technical solution for the above-mentioned filling valve, the filling part further includes an end cap, which is used to block the drain port.

[0008] As an optional technical solution for the above-mentioned filling valve, the end cap has a drain port, and the filling part further includes a drain valve, which is installed on the drain port.

[0009] As an optional technical solution for the above-mentioned filling valve, the filling cylinder has a cleaning fluid return port, which is connected to the material outlet, the filling cylinder has a cleaning fluid inlet, and the drain port is located below the cleaning fluid inlet.

[0010] As an optional technical solution for the above-mentioned filling valve, the injection piston includes a second valve stem and a second piston body. The second piston body is located between the cleaning fluid inlet and the drain port. The inner wall of the injection cylinder is provided with a release groove for the cleaning fluid inlet and the drain port to communicate. The release groove is located at the upper part of the injection cylinder. The groove wall of the release groove is set at a preset distance from the second piston body. The cleaning fluid inlet communicates with the release groove.

[0011] As an optional technical solution for the filling valve mentioned above, the material outlet is equipped with a nozzle, and a sealing gasket is provided on the top of the nozzle. The sealing gasket can abut against the outer side wall of the first piston body to block the material outlet.

[0012] As an optional technical solution for the filling valve mentioned above, the filling part further includes a dummy cup, which is installed at the material outlet of the filling cylinder to block the material outlet.

[0013] As an optional technical solution for the above-mentioned filling valve, the inner wall of the filling cylinder is provided with a spacer sleeve, the first valve stem passes through the spacer sleeve, and the first piston body is located below the spacer sleeve and can abut against the spacer sleeve.

[0014] As an optional technical solution for the above-mentioned filling valve, the first valve stem is also provided with a through hole for material to pass through, the through hole extending radially through the first valve stem.

[0015] As an optional technical solution for the above-mentioned filling valve, the first valve stem has a first rod and a second rod, the first rod and the second rod are fixedly connected, the first rod is located at the top of the second rod, the diameter of the first rod is larger than that of the second rod, the diameter of the second rod is smaller than that of the inner diameter of the spacer sleeve, and the second rod passes through the spacer sleeve.

[0016] The above technical solution has at least the following advantages or beneficial effects:

[0017] Because the bottom of the injection cylinder has a drain port, the cleaning fluid enters both the injection cylinder and the filling cylinder to clean them. Then, the drain port is opened to discharge the used cleaning fluid, thus achieving the purpose of cleaning the filling valve. Furthermore, the filling cylinder and the injection cylinder are connected, allowing the cleaning fluid to flow within both, cleaning both cylinders simultaneously and reducing the amount of cleaning fluid used. The piston body of the filling piston is used to seal either the material outlet or the material inlet. When sealing the material outlet, the injection piston moves upward, drawing material from the material inlet into the injection cylinder through negative pressure. When sealing the material inlet, the filling piston moves downward, squeezing material from the material outlet into the filling container. In this way, the cleaning fluid also achieves the purpose of cleaning the inside of the filling valve through the coordinated action of the injection piston and the filling piston. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the filling valve in an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the filling valve in an embodiment of the present invention;

[0020] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0021] Figure 4 This is a schematic diagram showing the state of the filling valve during the material extraction process in an embodiment of this utility model;

[0022] Figure 5 This is a schematic diagram showing the state of the filling valve at the sealing material inlet in an embodiment of this utility model;

[0023] Figure 6 This is a schematic diagram showing the state of the filling valve during the filling process in an embodiment of this utility model;

[0024] Figure 7 This is a schematic diagram of the filling valve in the state of sealing the material inlet in an embodiment of this utility model;

[0025] Figure 8 This is a schematic diagram showing the state of the filling valve during the cleaning process in an embodiment of this utility model;

[0026] Figure 9 This is a schematic diagram of the filling valve in the state of cleaning and discharging the remaining cleaning liquid in an embodiment of this utility model.

[0027] In the picture:

[0028] 1. Injection cylinder; 11. Second flange cover; 12. Piston cylinder body; 121. Cleaning fluid inlet; 13. Third valve body; 131. Second connecting hole; 2. Injection piston; 21. Second valve stem; 22. Second piston body; 221. Guide sleeve; 222. Body; 223. First piston sealing ring; 224. Second piston sealing ring; 225. Guide ring; 3. Filling cylinder; 31. First flange cover; 32. First valve body; 321. Material inlet; 33. Fixing plate; 34. Second valve body; 341. First connecting hole; 35. Valve seat; 351. Cleaning fluid return port; 36. Spacing sleeve; 4. Filling piston; 41. First valve stem; 411. First rod; 412. Second rod; 42. First piston body; 5. End cap; 6. Drain valve; 7. Nozzle; 8. Dummy cup; 9. First power structure; 10. Second power structure. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] like Figures 1 to 3 As shown, the filling valve includes an injection section and a filling section. The injection section is used to draw in the material and squeeze the material into the filling section, and then fill the material into the container through the material outlet.

[0034] The filling section includes a filling cylinder 1 and a filling piston 2. The filling piston 2 is located inside the filling cylinder 1 and can move relative to the filling cylinder 1. A drain port is provided at the bottom of the filling cylinder 1. The filling section includes a filling cylinder 3 and a filling piston 4. The filling piston 4 includes a first valve stem 41 and a first piston body 42. The first valve stem 41 is connected to the first piston body 42, and the first piston body 42 is located inside the filling cylinder 3. The filling cylinder 3 is connected to the filling cylinder 1. The filling cylinder 3 has a material inlet 321 and a material outlet. The material inlet 321 is located above the material outlet, and the first piston body 42 is located between the material inlet 321 and the material outlet. The connection between the filling cylinder 3 and the filling cylinder 1 is higher than the material outlet and lower than the material inlet 321. The piston body of the filling piston 4 can selectively block the material outlet or the material outlet to selectively connect the connection between the filling cylinder 3 and the filling cylinder 1 with the material outlet or the material inlet 321.

[0035] Because the bottom of the injection cylinder 1 is equipped with a drain port, the cleaning fluid enters the injection cylinder 1 and the filling cylinder 3 to clean them. Then, the drain port is opened to discharge the washed cleaning fluid, thereby achieving the purpose of cleaning the filling valve. In addition, the filling cylinder 3 and the injection cylinder 1 are connected, and the cleaning fluid can flow in the filling cylinder 1 and the injection cylinder 3, thereby cleaning both the injection cylinder 1 and the filling cylinder 3 at the same time, reducing the amount of cleaning fluid used. The piston body of the filling piston 4 is used to block the material outlet or the material inlet 321. When blocking the material outlet, the injection piston 2 moves upward to draw the material from the material inlet 321 into the injection cylinder 1 through negative pressure. The filling piston 4 blocks the material inlet, and the injection piston 2 moves downward to squeeze the material from the material outlet into the filling container. In this way, the cleaning fluid can also achieve the purpose of cleaning the inside of the filling valve through the coordinated action of the injection piston 2 and the filling piston 4.

[0036] like Figure 3 As shown, in some embodiments, the injection section further includes an end cap 5, which is used to block the drain port.

[0037] For example, the end cap 5 is connected to the injection cylinder 1 by fasteners, such as screws. This allows the end cap 5 to be directly removed and cleared through the drain port after the injection cylinder 1 becomes clogged. The end cap 5 also prevents material from flowing out of the drain port.

[0038] like Figure 3 As shown, in some embodiments, the end cap 5 has a drain port, and the filling part also includes a drain valve 6, which is installed at the drain port.

[0039] When the filling valve is not clogged and requires cleaning, simply opening the drain valve 6 will allow the cleaning solution to drain, thus improving cleaning efficiency and eliminating the need to disassemble the end cap 5 at the drain port. The structure of the drain valve 6 is existing technology and will not be described in detail here.

[0040] like Figure 3 As shown, in some embodiments, the filling cylinder 3 has a cleaning fluid return port 351, which is connected to the material outlet, and the filling cylinder 1 has a cleaning fluid inlet 121, with the drain outlet located below the cleaning fluid inlet 121.

[0041] After the cleaning fluid enters the filling cylinder 3, it enters the connecting pipe through the cleaning fluid return port 351, and then enters the cleaning fluid inlet 121 through the connecting pipe, thereby realizing the circulation of the cleaning fluid between the injection cylinder 1 and the filling cylinder 3, thus cleaning the injection cylinder 1 and the filling cylinder 3. This can save the amount of cleaning fluid used. The drain port is located below the cleaning fluid inlet 121, which can ensure that the cleaning fluid at the bottom of the filling cylinder 3 flows out from the drain port, preventing the cleaning fluid from accumulating at the bottom of the filling cylinder 3.

[0042] It is understood that the cleaning fluid inlet 121 can be located below or above the second piston body 22.

[0043] Optionally, the cleaning fluid inlet 121 is usually located above the second piston body 22, which can prevent material from entering the connecting pipe after entering the cleaning fluid inlet 121.

[0044] like Figure 3 As shown, in some embodiments, the injection piston 2 includes a second valve stem 21 and a second piston body 22. The second piston body 22 is located between the cleaning fluid inlet 121 and the discharge port. The inner wall of the injection cylinder 1 is provided with a release groove for the cleaning fluid inlet 121 to communicate with the discharge port. The groove wall is located at the upper part of the injection cylinder 1. The release groove is set at a preset distance from the second piston body 22. The cleaning fluid inlet 121 communicates with the release groove.

[0045] The release groove is set at a preset distance from the second piston body 22. This release groove ensures a certain gap between the second piston body 22 and the injection cylinder 1. When the cleaning fluid enters the injection cylinder 1 through the cleaning fluid inlet 121, it flows through the gap to the bottom of the injection cylinder 1. In other words, the release groove ensures that when the cleaning fluid inlet 121 is above the second piston body 22, the cleaning fluid can flow smoothly to the bottom of the injection cylinder 1 and enter the filling cylinder 3 through the connection between the injection cylinder 1 and the filling cylinder 3. The release groove is located at the top of the injection cylinder 1, and the cleaning fluid inlet 121 is also located at the top of the injection cylinder 1. After the second piston body 22 is completely within the area enclosed by the release groove, the cleaning fluid can enter the bottom of the injection cylinder 1.

[0046] like Figure 3 As shown, in some embodiments, a material outlet is equipped with a nozzle 7, and a sealing gasket is provided on the top of the nozzle 7. The sealing gasket can abut against the outer side wall of the first piston body 42 to block the material outlet.

[0047] The nozzle 7 is designed to accurately inject materials into the container to be filled, preventing materials from flowing along the end face of the first piston body 42 at the material outlet, thus ensuring the cleanliness of the material outlet. In addition, it can also prevent materials from spilling outside the container to be filled during filling.

[0048] like Figure 3 As shown, in some embodiments, the inner wall of the filling cylinder 3 is provided with a spacer sleeve 36, the first valve stem 41 passes through the spacer sleeve 36, and the first piston body 42 is located below the spacer sleeve 36 and can abut against the spacer sleeve 36.

[0049] For example, the spacer sleeve 36 is connected to the filling cylinder 3 by an interference fit, thereby fixing the spacer sleeve 36 relative to the filling cylinder 3. Of course, in other embodiments, the inner wall of the filling cylinder 3 extends a limiting part towards the central axis, and both the upper and lower ends of the spacer sleeve 36 are provided with limiting parts. The limiting parts can limit the upward and downward movement of the spacer sleeve 36, preventing it from moving upward under the action of the first piston body 42 and moving downward under the impact of the material, thus ensuring that the spacer sleeve 36 is fixed in position relative to the filling cylinder 3.

[0050] Specifically, the filling cylinder 3 includes a first flange cover 31, a first valve body 32, a fixing plate 33, a second valve body 34, and a valve seat 35. The first flange cover 31, first valve body 32, fixing plate 33, and second valve body 34 are sequentially fixedly connected from top to bottom by fasteners, specifically screws. The valve seat 35 is fixedly connected to the second valve body 34, either by fasteners or by welding. A sealing gasket is provided between the valve seat 35 and the second valve body 34 to prevent material leakage. The second valve body 34 has a first connecting hole 341. The filling cylinder 3 has a filling hole that penetrates the first valve body 32, the fixing plate 33, and the second valve body 34, communicating with the first connecting hole 341. A cleaning fluid return port 351 is partially located in the second valve body 34 and partially in the valve seat 35, thus penetrating both the second valve body 34 and the valve seat 35. The valve seat 35 has a first locking block to engage with the dummy cup 8.

[0051] The spacer sleeve 36 is inserted through the fixing plate 33, and part of the spacer sleeve 36 is located inside the first valve body 32, while the other part of the spacer sleeve 36 is located inside the second valve body 34. Both the first valve body 32 and the second valve body 34 are provided with limiting parts, thereby enabling the spacer sleeve 36 to be limited up and down.

[0052] The filling cylinder 1 includes a second flange cover 11, a piston cylinder body 12, and a third valve body 13. These components are connected sequentially from top to bottom. A release groove is specifically located on the upper part of the piston cylinder body 12. A second locking block is located at the bottom of the second flange cover 11, and a second locking groove is located on the piston cylinder body 12. The second locking block is installed in the second locking groove to achieve initial positioning of the second flange rod and the piston cylinder body 12. The piston cylinder body 12 and the third valve body 13 are fixedly connected by a pressure block. The washing liquid inlet is located on the second flange cover 11. The third valve body 13 has a second connecting hole 131, which connects to the first connecting hole 341. The second connecting hole 131 also connects to a drain port located at the bottom of the third valve body 13. The third valve body 13 is fixedly connected to the piston cylinder body 12, either by screws or by welding. To reduce the airtightness of the second valve body 34 and the third valve body 13 after they are connected by external connectors, the second valve body 34 and the third valve body 13 are integrally molded. This can prevent material leakage at the joint between the two and provide a tight fit between the injection part and the filling part.

[0053] In some embodiments, the first valve stem 41 is further provided with a through hole for material to pass through, the through hole extending radially through the first valve stem 41.

[0054] If the first valve stem 41 is a solid rod, it will hinder the flow of material into the filling section and the injection section. However, if the first valve stem 41 is provided with a through hole, the flow of material into the filling section and the injection section per unit time can be increased, thereby improving the operating efficiency.

[0055] like Figure 3 and Figure 5 As shown, in some embodiments, the first valve stem 41 has a first rod 411 and a second rod 412. The first rod 411 is fixedly connected to the second rod 412. The first rod 411 is located at the top of the second rod 412. The diameter of the first rod 411 is larger than that of the second rod 412. The diameter of the second rod 412 is smaller than that of the inner diameter of the spacer sleeve 36. The second rod 412 passes through the spacer sleeve 36.

[0056] Since the filling valve needs to measure the quantity of filling, the first valve stem 41 needs to ensure that when the material enters the filling valve, it enters the injection section through the spacer sleeve 36 for temporary storage, and then is discharged out through the injection section and filled into the container through the filling section. Therefore, the diameter of the first rod 411 is larger than that of the second rod 412 to improve the overall strength of the first valve stem 41, and the diameter of the second rod 412 is smaller than that of the inner diameter of the spacer sleeve 36 to ensure that the material flows into the injection cylinder 1 through the gap between the second rod 412 and the spacer sleeve 36.

[0057] In some embodiments, the second piston body 22 includes a guide sleeve 221, a body 222, a first piston sealing ring 223, a second piston sealing ring 224, and a guide ring 225. The upper and lower ends of the guide sleeve 221 are fixedly connected to the second valve stem 21 and the body 222, respectively. The first piston sealing ring 223 and the second piston sealing ring 224 are sleeved on the outer peripheral wall of the body 222, and the guide ring 225 is sleeved on the outer peripheral wall of the guide sleeve 221. This arrangement ensures that the second piston body 22 remains sealed to the inner wall of the filling cylinder 1 throughout the filling process.

[0058] like Figure 1 As shown, the injection section also includes a first power structure 9, and the filling section also includes a second power structure 10. The first power structure 9 is fixedly connected to the injection piston 2 to drive the injection piston 2 to reciprocate linearly within the injection cylinder 1, achieving the purpose of quantitative material dispensing and injection. The second power structure 10 is connected to the filling piston 4 to drive the filling piston 4 to reciprocate linearly within the filling cylinder 3. For example, both the first power structure 9 and the second power structure 10 are linear motors or cylinders.

[0059] An adjusting shim is provided between the guide sleeve 221 and the body 222. The adjusting shim can be installed in appropriate quantities according to the compression of the first piston sealing ring 223 and the second piston sealing ring 224, thereby achieving the tightness of the installation of the first piston sealing ring 223 and the second piston sealing ring 224.

[0060] like Figure 8 and Figure 9 As shown, in some embodiments, the filling section also includes a dummy cup 8, which is installed at the material outlet of the filling cylinder 3 to block the material outlet.

[0061] For example, the dummy cup 8 is designed to block the material outlet during filling valve cleaning. The dummy cup 8 completely covers the nozzle 7, thereby preventing cleaning fluid from flowing out of the nozzle 7 and reducing the amount of cleaning fluid used. For example, the dummy cup 8 has a first groove, and the filling cylinder has a first locking block. The first locking block engages with the first groove to fix the dummy cup 8.

[0062] like Figure 4 As shown, when the filling piston 4 moves to its lowest position, it blocks the material outlet. The injection piston 2 is pulled upward, creating a negative pressure inside the injection cylinder 1. Under the action of the pressure difference, the material is drawn into the injection cylinder 1, completing the material intake. This allows the material to enter the filling cylinder 3 through the material inlet 321 and then into the injection cylinder 1. After reaching the preset height, the material is quantitatively stored in the filling valve. Figure 5 As shown, the filling piston 4 moves upward to cut off the flow path between the material inlet and the filling cylinder 1, as... Figure 6As shown, the injection piston 2 moves downward to push the material out of the material outlet and into the container located below the nozzle 7, as... Figure 7 As shown, when the filling piston 4 is fully positioned at the bottom of the filling cylinder 1, a measured amount of material is discharged, at which point the filling piston's downward movement is complete. This filling valve repeats the process as follows. Figures 4 to 7 The action of the filling piston 2 enables the filling of different containers. The stroke distance of the filling piston 2 determines the volume of material sucked in. By adjusting the stroke of the filling piston 2, the amount of material filled each time can be precisely controlled to meet the filling requirements of different specifications.

[0063] like Figure 8 and Figure 9 As shown, when the filling valve needs to be cleaned, the injection piston 2 is pulled up so that it is located in the area enclosed by the release groove, thereby forming a gap between the injection piston 2 and the injection cylinder 1 for the cleaning liquid to pass through. The dummy cup 8 needs to be installed at the bottom of the valve seat 35 to block the material outlet. Then, CIP cleaning liquid is introduced from the cleaning liquid inlet 121. The CIP cleaning liquid flows into the injection cylinder 1 from the gap formed between the injection piston 2 and the injection cylinder 1, and enters the filling cylinder 3 through the third valve body 13 and the second valve body 34. Then, it enters the connecting pipeline through the cleaning liquid return port 351 and returns to the cleaning liquid inlet 121, thereby achieving the purpose of CIP cleaning liquid circulating and flushing the inner wall of the injection cylinder 1 and the filling cylinder 3, thereby cleaning the filling valve. After cleaning, the dummy cup 8 is removed, allowing the cleaning liquid to flow out from the material outlet, and the drain valve 6 is opened to drain the remaining cleaning liquid at the bottom of the injection cylinder 1.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A filling valve, characterized in that, include: The injection section includes an injection cylinder (1) and an injection piston (2). The injection piston (2) is located inside the injection cylinder (1) and can move relative to the injection cylinder (1). The bottom of the injection cylinder (1) is provided with a drain port. The filling unit includes a filling cylinder (3) and a filling piston (4). The filling piston (4) includes a first valve stem (41) and a first piston body (42). The first valve stem (41) is connected to the first piston body (42), and the first piston body (42) is located inside the filling cylinder (3). The filling cylinder (3) is connected to the injection cylinder (1). The filling cylinder (3) has a material inlet (321) and a material outlet. The material inlet (321) is located at the material outlet. Above the opening, and the first piston body (42) is located between the material inlet (321) and the material outlet, the connection between the filling cylinder (3) and the injection cylinder (1) is higher than the material outlet and lower than the material inlet (321), and the piston body of the filling piston (4) can selectively block the material outlet or the material inlet (321) so as to selectively connect the connection between the filling cylinder (3) and the injection cylinder (1) with the material outlet or the material inlet (321).

2. The filling valve according to claim 1, characterized in that, The injection section also includes an end cap (5), which is used to seal the drain port.

3. The filling valve according to claim 2, characterized in that, The end cap (5) has a drain port, and the injection part further includes a drain valve (6), which is installed at the drain port.

4. The filling valve according to claim 1, characterized in that, The filling cylinder (3) has a cleaning fluid return port (351), which is connected to the material outlet. The filling cylinder (1) has a cleaning fluid inlet (121), and the drain outlet is located below the cleaning fluid inlet (121).

5. The filling valve according to claim 4, characterized in that, The injection piston (2) includes a second valve stem (21) and a second piston body (22). The second piston body (22) is located between the cleaning fluid inlet (121) and the drain port. The inner wall of the injection cylinder (1) is provided with a release groove for the cleaning fluid inlet (121) to communicate with the drain port. The release groove is located at the upper part of the injection cylinder (1). The groove wall of the release groove is set at a preset distance from the second piston body (22). The cleaning fluid inlet (121) communicates with the release groove.

6. The filling valve according to claim 1, characterized in that, The material outlet is equipped with a nozzle (7), and a sealing gasket is provided on the top of the nozzle (7). The sealing gasket can abut against the outer side wall of the first piston body (42) to block the material outlet.

7. The filling valve according to claim 1, characterized in that, The filling section also includes a dummy cup (8), which is installed at the material outlet of the filling cylinder (3) to block the material outlet.

8. The filling valve according to claim 1, characterized in that, The inner wall of the filling cylinder (3) is provided with a spacer sleeve (36), the first valve stem (41) passes through the spacer sleeve (36), and the first piston body (42) is located below the spacer sleeve (36) and can abut against the spacer sleeve (36).

9. The filling valve according to claim 8, characterized in that, The first valve stem (41) is also provided with a through hole for material to pass through, the through hole extending radially through the first valve stem (41).

10. The filling valve according to claim 9, characterized in that, The first valve stem (41) has a first rod (411) and a second rod (412). The first rod (411) is fixedly connected to the second rod (412). The first rod (411) is located at the top of the second rod (412). The diameter of the first rod (411) is larger than that of the second rod (412). The diameter of the second rod (412) is smaller than that of the inner diameter of the spacer sleeve (36). The second rod (412) passes through the spacer sleeve (36).

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