CN220012094U - Filling mechanism and liquid filling equipment using same - Google Patents

Abstract

The utility model discloses a filling mechanism and liquid filling equipment using the same. Comprising the following steps: the support body is provided with a support surface; the filling body is movably arranged above the supporting surface; the filling body comprises a filling assembly and a bottle support; the bottle support piece is used for placing the filling bottle; the bottle support piece is provided with a filling station and a reflux station; the filling assembly includes: the liquid storage tank, the filling part and the backflow part are communicated with the liquid storage tank, and the backflow part is arranged flush with the end part of the filling part, which is close to the supporting surface; the filling part is positioned above the bottle support; when the filling bottle is in the reflux station, the filling assembly seals the bottle mouth of the filling bottle all the time, keeps the vacuum environment inside the filling bottle, enables the end part of the filling part and the end part of the reflux part to be flush with the preset standard liquid level, and when the solution exceeding the preset standard liquid level enters the filling bottle, the solution higher than the preset standard liquid level is recovered through the reflux part, so that the liquid level in the filling bottle is finally in the preset standard liquid level, and the filling precision is ensured.

Description

Filling mechanism and liquid filling equipment using same

Technical Field

The present disclosure relates generally to the field of liquid filling technology, and in particular, to a filling mechanism and a liquid filling apparatus using the same.

Background

The quantitative filling technology is widely applied in factories for producing oral liquid, in the process of producing the oral liquid, the accurate quantitative filling of the oral liquid can influence the filling degree of a container and the production cost, and the filling speed during the production of the oral liquid can also influence the production efficiency and time.

Through searching, patent CN 205556047U discloses a small-sized ganoderma lucidum oral liquid quick filling device, which adopts a liquid level sensor to be electrically connected with a filling valve to control the opening and closing of the filling valve. However, the specific structure and the working principle of the liquid filling valves of different types are different, the filling precision is directly affected, and if the scheme disclosed by the patent is applied to the high-precision liquid filling valve, the closing of the filling valve can be realized, and the liquid level of the oral liquid reaches the standard height; if the scheme disclosed in the above patent is applied to a common or low-precision liquid filling valve, delay problems exist when the filling valve is controlled to be closed, so that the liquid level of the oral liquid exceeds the standard height, and the filling precision cannot be accurately controlled. Therefore, we propose a filling mechanism and a liquid filling device using the same to solve the above problems.

Disclosure of Invention

In view of the above-mentioned drawbacks or shortcomings in the prior art, it is desirable to provide a filling mechanism and a liquid filling apparatus using the same, which have the advantages of accurate control of filling liquid level, good reliability, strong applicability, simple structure and easy realization.

In a first aspect, the present utility model provides a filling mechanism comprising:

the support body is provided with a support surface;

the filling body is movably arranged on the supporting surface; the filling body comprises a filling assembly and a bottle support;

the bottle support piece is used for placing the filling bottle; the bottle support piece is provided with a filling station and a reflux station;

the filling assembly comprises: the liquid storage tank, the filling part and the backflow part are communicated with the liquid storage tank, and the backflow part is arranged flush with the end part, close to the supporting surface, of the filling part; the filling part is positioned above the bottle support;

when the bottle support piece is positioned at the filling station, the filling assembly seals the bottle mouth of the filling bottle, and the filling assembly is used for vacuumizing the filling bottle so as to form a vacuum environment inside the filling bottle, at the moment, the filling part stretches into the filling bottle, and the solution in the liquid storage tank is filled into the filling bottle through the filling part until the preset standard liquid level of the filling bottle is reached;

when the bottle support is positioned at the reflow station, a vacuum environment is kept in the filling bottle, the end part of the reflow part is flush with the preset standard liquid level, and the solution higher than the preset standard liquid level in the filling bottle is recovered through the reflow part.

According to the technical scheme provided by the embodiment of the utility model, the bottle support piece is further provided with a non-filling station, a bottle inlet station and a bottle outlet station.

According to the technical scheme provided by the embodiment of the utility model, the supporting body comprises:

the first support section, the second support section, the third support section, the fourth support section and the fifth support section are sequentially connected, and the surfaces of the support sections jointly form the support surface;

when the bottle holder moves to the first support section, the bottle holder is in the non-filling station;

when the bottle support piece moves to the second supporting section, the bottle support piece is positioned at the bottle feeding station;

when the bottle holder moves to the third supporting section, the bottle holder is at the filling station;

when the bottle holder moves to the fourth supporting section, the bottle holder is at the reflow station;

when the bottle support moves to the fifth supporting section, the bottle support is positioned at the bottle outlet station.

According to the technical scheme provided by the embodiment of the utility model, the third support section is smoothly connected with the fourth support section through the transition section;

the vertical distance between one end of the transition section, which is close to the third support section, and the bottom surface of the support body is greater than the vertical distance between one end of the transition section, which is close to the fourth support section, and the bottom surface of the support body.

According to the technical scheme provided by the embodiment of the utility model, the filling assembly comprises:

the first base is arranged above the supporting surface and is provided with an opening capable of accommodating the bottle support to penetrate through;

a driving member movably disposed between the first base and the support surface; the driving piece is provided with a driving shaft which is connected with the bottle supporting piece;

the filling unit is arranged on one side, far away from the supporting surface, of the first base; the filling unit is provided with a second base for installing the liquid storage tank, the filling part and the backflow part;

the filling portion is capable of filling a solution into the respective filling bottle when the bottle holder is in the filling station.

According to the technical scheme provided by the embodiment of the utility model, the filling unit further comprises: a filling valve disposed on the second base;

the filling valve comprises:

the valve body is hollow, and a valve core tube coaxially arranged with the valve body is arranged in the valve body; a first space is formed between the valve body and the valve core pipe; the valve body is provided with a connector communicated with the first space, and the connector is communicated with the liquid storage tank through a liquid inlet pipe; one end of the valve core pipe is communicated with the vacuumizing piece;

the sliding sleeve is sleeved on the valve core tube and is in sliding connection with one side, away from the vacuumizing piece, of the valve body; one end of the sliding sleeve, which is far away from the valve body, is provided with a sealing element, and when the bottle support element is positioned at the filling station, the sealing element can seal the bottle mouth of the filling bottle;

the liquid level adjusting pipe is arranged at the free end of the valve core pipe; the liquid level adjusting pipe is communicated with the valve core pipe and forms the backflow part;

the valve pipe is sleeved on the liquid level adjusting pipe, and one end of the valve pipe is connected with one end of the sliding sleeve, which is far away from the vacuumizing piece; a second space is formed between the valve pipe and the liquid level adjusting pipe, and the second space is communicated with the first space and forms the filling part.

According to the technical scheme provided by the embodiment of the utility model, the vacuumizing piece is communicated with the liquid storage tank through the return pipe.

According to the technical scheme provided by the embodiment of the utility model, the sealing element comprises:

the sealing gasket is arranged at one end, far away from the vacuumizing piece, of the sliding sleeve in a surrounding mode;

the elastic element is sleeved on the sliding sleeve and is positioned between the valve body and the sealing gasket.

In a second aspect, the present utility model provides a liquid filling apparatus comprising: the filling mechanism.

In summary, the utility model specifically discloses a specific structure of a filling mechanism. The utility model designs a supporting body, wherein the supporting body is provided with a supporting surface, and the supporting surface is used for supporting the filling body to move, wherein the filling body comprises a filling assembly and a bottle support piece, the bottle support piece is used for placing a filling bottle, and the bottle support piece is provided with a filling station and a reflow station; the filling assembly comprises a liquid storage tank, and a filling part and a backflow part which are communicated with the liquid storage tank, wherein the backflow part and the end part of the filling part, which is close to the supporting surface, are arranged in a flush manner, and the filling part is positioned above the bottle support piece; when the bottle supporting piece is positioned at the filling station, the filling assembly seals the bottle mouth of the filling bottle, and the filling assembly vacuumizes the filling bottle to form a vacuum environment inside the filling bottle, at the moment, the filling part stretches into the filling bottle, and the solution in the liquid storage tank is filled into the filling bottle through the filling part until reaching the preset standard liquid level of the filling bottle; when the bottle support is in the reflux station, the vacuum environment is kept in the filling bottle, the end part of the reflux part is flush with the preset standard liquid level, and the solution higher than the preset standard liquid level in the filling bottle is recovered through the reflux part.

According to the utility model, the reflux station is additionally arranged for the bottle support, so that the filling bottle enters the reflux station after reaching the preset standard liquid level at the filling station, at the moment, the filling bottle still keeps a vacuum environment, when the filling bottle enters the solution higher than the preset standard liquid level, namely, the used filling valve has the problem of delayed closing, the solution higher than the preset standard liquid level can be sucked away by the reflux part and recycled into the liquid storage tank, so that the liquid level in the filling bottle can be finally at the preset standard liquid level, and the filling precision in the production process is further ensured.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:

fig. 1 is a schematic structural view of a filling mechanism.

Fig. 2 is a schematic view of the overall structure of the support body.

Fig. 3 is a schematic top view of the support body.

Fig. 4 is a schematic structural view of the filling valve.

Reference numerals in the drawings: 1. a bottle holder; 2. filling a bottle; 3. a first support section; 4. a second support section; 5. a third support section; 6. a fourth support section; 7. a fifth support section; 8. a first base; 9. a driving member; 10. a second base; 11. a filling valve; 12. a valve body; 13. a valve core tube; 14. a joint; 15. a liquid storage tank; 16. a liquid inlet pipe; 17. a sliding sleeve; 18. a liquid level adjusting tube; 19. a valve tube; 20. a return pipe; 21. a sealing gasket; 22. an elastic element.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the utility model are shown in the drawings.

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

Referring to fig. 1 to 4, a first embodiment of a filling mechanism according to the present utility model includes:

the support body is provided with a support surface;

the filling body is movably arranged on the supporting surface; the filling body comprises a filling assembly and a bottle holder 1;

the bottle support 1 is used for placing a filling bottle 2; the bottle holder 1 is provided with a filling station and a reflow station;

the filling assembly comprises: the liquid storage tank 15, a filling part and a backflow part which are communicated with the liquid storage tank 15, wherein the backflow part is arranged flush with the end part of the filling part, which is close to the supporting surface; the filling part is positioned above the bottle support 1;

when the bottle support 1 is in the filling station, the filling assembly seals the bottle mouth of the filling bottle 2, and vacuumizes the filling bottle 2 through the filling assembly so as to form a vacuum environment inside the filling bottle 2, at the moment, the filling part stretches into the filling bottle 2, and the solution in the liquid storage tank 15 is filled into the filling bottle 2 through the filling part until reaching the preset standard liquid level of the filling bottle 2;

when the bottle support 1 is in the reflow station, the vacuum environment is maintained in the filling bottle 2, the end of the reflow part is level with the preset standard liquid level, and the solution higher than the preset standard liquid level in the filling bottle 2 is recovered through the reflow part.

In this embodiment, the support body has a support surface for supporting the movement of the filling body; as shown in fig. 3, the cross section of the support body is circular in shape; the support body includes: the first support section 3, the second support section 4, the third support section 5, the fourth support section 6 and the fifth support section 7 are sequentially connected, the surfaces of the support sections form a support surface together, and the support surface is annular so as to support the filling body to rotate along the support surface;

wherein, the upper surface of the first support section 3 is taken as a reference surface, and the vertical distance between the upper surface of the second support section 4 and the reference surface gradually increases from one side close to the first support section 3 to one side close to the third support section 5; the vertical distance between the upper surface of the fifth support section 7 and the reference surface gradually decreases from the side closer to the fourth support section to the side closer to the first support section 3; the vertical distance between the upper surface of the fourth support section and the reference surface is smaller than the vertical distance between the upper surface of the third support section and the reference surface; the third supporting section 5 is smoothly connected with the fourth supporting section 6 through a transition section, and as shown in fig. 2, the vertical distance between the end of the transition section, which is close to the third supporting section 5, and the bottom surface of the supporting body is greater than the vertical distance between the end of the transition section, which is close to the fourth supporting section 6, and the bottom surface of the supporting body, so that the filling body can stably slide from the third supporting section to the fourth supporting section.

The filling body is movably arranged on the supporting surface, and the filling body can rotate along the supporting surface because the cross section of the supporting body is in a circular shape;

wherein, the filling body includes: a filling assembly and a bottle holder 1; the bottle support 1 is used for placing the filling bottle 2; and the bottle holder 1 has a filling station and a reflow station; here, the filling station and the reflow station are arranged along the circumferential direction of the support body;

further, the bottle holder 1 further has: a non-filling station, a bottle inlet station and a bottle outlet station;

when the bottle holder 1 is moved to the first support section 3, the bottle holder 1 is in a non-filling station;

when the bottle support 1 moves to the second supporting section 4, the bottle support 1 is positioned at a bottle feeding station;

when the bottle holder 1 moves to the third support section 5, the bottle holder 1 is in the filling station;

when the bottle holder 1 moves to the fourth support section 6, the bottle holder 1 is in the reflow station;

when the bottle holder 1 is moved to the fifth support section 7, the bottle holder 1 is in the bottle discharging station.

The filling body rotates relative to the supporting body, so that the station where the bottle support 1 is located can be switched.

The filling assembly includes: a liquid storage tank 15, and a filling part and a reflux part which are communicated with the liquid storage tank 15, wherein the liquid storage tank 15 is used for storing solution; the end parts of the reflux part and the filling part, which are close to the supporting surface, are arranged in a flush way, so that the end parts of the filling part and the reflux part are always in the same plane, and the filling part is positioned above the bottle support 1 and is used for filling the solution into the filling bottle 2;

when the bottle support 1 is in a non-filling station, empty filling bottles 2 can be placed on the bottle support 1, and filling bottles 2 filled with standard solution can be taken out;

when the bottle support 1 is positioned at the bottle feeding station, the bottle support 1 drives the filling bottle 2 to gradually approach the filling part;

when the bottle support 1 is positioned at the filling station, the filling assembly seals the bottle mouth of the filling bottle 2, and the filling assembly vacuumizes the filling bottle 2 to form a vacuum environment inside the filling bottle 2, at the moment, the filling part extends into the filling bottle 2, and the filling part fills the solution into the filling bottle 2 until reaching the preset standard liquid level of the filling bottle 2; here, the preset standard liquid level is a standard liquid level of the filling bottle 2 set in actual production.

When the bottle support 1 is in the reflux station, the inside of the filling bottle 2 is kept in a vacuum environment, the end part of the filling part is flush with a preset standard liquid level, at the moment, the end part of the reflux part is also flush with the preset standard liquid level, and the solution in the filling bottle 2 higher than the preset standard liquid level is recovered through the reflux part;

when the bottle support 1 is positioned at the bottle outlet station, the bottle support 1 drives the filling bottle 2 to be gradually separated from the filling assembly until the filling bottle 2 is brought to the non-filling station;

the filling bottle 2 sequentially passes through a non-filling station, a bottle feeding station, a filling station reflow station and a bottle discharging station, and finally returns to the non-filling station, so that the accurate filling process of the filling bottle 2 can be completed once.

Compared with the prior art that the filling precision of the filling device is influenced by a filling valve, the utility model designs a reflux station for the bottle support 1, avoids the influence on the filling precision of the whole filling device caused by different types of the filling valve and whether the valve is delayed or not, specifically, when the filling bottle 2 is positioned at the filling station, the filling assembly seals the bottle mouth of the filling bottle 2, the filling assembly vacuumizes the filling bottle 2 to form a vacuum environment inside the filling bottle 2, at the moment, the filling part stretches into the filling bottle 2, the solution of the liquid storage tank 15 is led into the filling bottle 2 by the filling part until the liquid level in the filling bottle 2 reaches the preset standard liquid level, and the used filling valve is closed; the filling body is rotated for filling bottle 2 is in the backward flow station, and the tip of backward flow portion flushes with the standard liquid level of predetermineeing of filling bottle 2, and the filling subassembly is sealed with filling bottle 2 bottleneck throughout, keeps the inside vacuum environment of filling bottle 2, when entering the solution that surpasss the standard liquid level of predetermineeing in the filling bottle 2, the filling valve that promptly used has the delay and closes the problem, then can retrieve the solution that is higher than the standard liquid level of predetermineeing through the backward flow portion, makes the liquid level in the filling bottle 2 finally be in the standard liquid level of predetermineeing, thereby guarantees the filling precision in the production process. The scheme of the utility model is suitable for filling small bottles, such as oral liquid, and can realize high-precision filling.

The duration of the filling bottle 2 at the reflux station is longer than or equal to the delayed closing duration of the filling valve, so that the solution in the filling bottle 2 higher than the preset standard liquid level can be completely recovered by the reflux part.

Further, as shown in fig. 1, the filling assembly includes:

the first base 8 is arranged above the supporting surface and is used for installing components used for filling; the first base 8 is provided with an opening which can accommodate penetration of the bottle support 1, and the opening can accommodate movement of the bottle support 1; here, the first base 8 and the support body bottom surface may be rotatably connected by a support shaft.

A driving member 9, the driving member 9 being movably disposed between the first base 8 and the support surface; the driving member 9 has a driving shaft, which is connected to the bottle holder 1;

wherein the specific structure of the driving member 9 is, for example, a rotating roller which is rotatably connected with the side wall of the bottle holder 1; when the rotary roller moves on the supporting surface, the rotary roller can drive the whole filling body to rotate corresponding to the supporting body, and when the bottle support 1 rotates to a bottle feeding station, a filling station, a reflux station or a bottle discharging station, the bottle support 1 can slide along the opening of the first base 8.

The filling unit is arranged on one side of the first base 8 away from the supporting surface; the filling unit is provided with a second base 10 for mounting a liquid storage tank 15, a filling part and a reflux part;

when the bottle holders 1 are in the filling station, the filling section is able to fill the respective filling bottles 2 with a solution.

Specifically, as shown in fig. 4, the filling unit further includes: a filling valve 11 provided on the second base 10;

the filling valve 11 includes:

a valve body 12, the valve body 12 is mounted on the second base 10, the valve body 12 is hollow and is internally provided with a valve core tube 13 coaxially arranged with the valve body 12; a first space is formed between the valve body 12 and the valve core tube 13; the valve body 12 is provided with a joint 14 communicated with the first space, and the joint 14 is communicated with a liquid storage tank 15 through a liquid inlet pipe 16; one end of the valve core pipe 13 is communicated with the vacuumizing piece; wherein the vacuumizing piece is communicated with the liquid storage tank 15 through a return pipe 20; here, the type of the vacuuming member is, for example, a vacuum pump.

The sliding sleeve 17 is sleeved on the valve core tube 13, and is in sliding connection with one side of the valve body 12, which is far away from the vacuumizing piece; the end of the sliding sleeve 17 far away from the valve body 12 is provided with a sealing element, and when the bottle support 1 is positioned at the filling station, the sealing element can seal the bottle mouth of the filling bottle 2;

a liquid level adjusting tube 18, the liquid level adjusting tube 18 being arranged at the free end of the valve core tube 13; the liquid level adjusting pipe 18 is communicated with the valve core pipe 13 and forms a reflux part;

the valve pipe 19 is sleeved on the liquid level adjusting pipe 18, and one end of the valve pipe 19 is connected with one end of the sliding sleeve 17 far away from the vacuumizing piece; a second space is formed between the valve tube 19 and the liquid level adjustment tube 18, and the second space is communicated with the first space and forms a filling portion.

The specific working procedure of the filling valve 11 is as follows:

when the filling bottle 2 is at the filling station, the sealing element seals the opening of the filling bottle 2, the vacuumizing element is used for vacuumizing the filling bottle 2 through the valve core tube 13 and the liquid level adjusting tube 18, and then the liquid inlet tube 16 is used for guiding the solution in the liquid storage tank 15 into the first space and the second space through the connector 14, and finally the solution flows into the filling bottle 2.

When the filling bottle 2 is in the reflow station, the end of the liquid level adjusting tube 18 is flush with the preset standard liquid level, the sealing element seals the bottle mouth of the filling bottle 2, the vacuum environment inside the filling bottle 2 is kept, and when the solution in the bottle is higher than the preset standard liquid level, the liquid level adjusting tube 18 sucks the solution higher than the preset standard liquid level, and the solution flows back to the liquid storage tank 15 through the valve core tube 13, the vacuumizing element and the reflow tube 20.

Further, as shown in fig. 4, the sealing member includes:

the sealing gasket 21 is arranged at one end, far away from the vacuumizing piece, of the sliding sleeve 17 in a surrounding manner, and is used for improving the tightness of one end, far away from the valve body 12, of the sliding sleeve 17 to the bottle mouth of the filling bottle 2; here, the gasket 21 is of a rubber gasket type, for example.

The elastic element 22 is sleeved on the sliding sleeve 17, the elastic element 22 is positioned between the valve body 12 and the sealing gasket 21, and when the sealing gasket 21 is pressed by the bottle mouth of the filling bottle 2, the elastic element 22 generates elastic acting force and acts on the sealing gasket 21, so that the sealing gasket 21 can seal the bottle mouth of the filling bottle 2. Here, the elastic element 22 is of the type, for example, a spring.

Example 2

A liquid filling apparatus comprising: the filling mechanism described in the above embodiments enables the liquid filling apparatus to have the functions and advantages of the filling mechanism, and will not be described herein.

The above description is only illustrative of the preferred embodiments of the present utility model and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in the present utility model is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present utility model (but not limited to) having similar functions are replaced with each other.

Claims (9)

1. A filling mechanism, comprising:

the support body is provided with a support surface;

the filling body is movably arranged on the supporting surface; the filling body comprises a filling assembly and a bottle holder (1);

the bottle support (1) is used for placing the filling bottle (2); the bottle support (1) is provided with a filling station and a reflow station;

the filling assembly comprises: the liquid storage tank (15), and a filling part and a backflow part which are communicated with the liquid storage tank (15), wherein the backflow part is arranged flush with the end part of the filling part, which is close to the supporting surface; the filling part is positioned above the bottle support (1);

when the bottle support (1) is positioned at the filling station, the filling assembly seals the bottle mouth of the filling bottle (2), and the filling assembly vacuumizes the filling bottle (2) to form a vacuum environment inside the filling bottle (2), at the moment, the filling part stretches into the filling bottle (2), and the solution in the liquid storage tank (15) is filled into the filling bottle (2) through the filling part until reaching the preset standard liquid level of the filling bottle (2);

when the bottle support (1) is positioned at the reflow station, the inside of the filling bottle (2) is kept in a vacuum environment, the end part of the reflow part is flush with the preset standard liquid level, and the solution higher than the preset standard liquid level in the filling bottle (2) is recycled through the reflow part.

2. A filling mechanism according to claim 1, wherein the bottle holder (1) further has a non-filling station, a bottle-in station and a bottle-out station.

3. The filling mechanism of claim 2, wherein the support body comprises:

the first support section (3), the second support section (4), the third support section (5), the fourth support section (6) and the fifth support section (7) are sequentially connected, and the surfaces of the support sections jointly form the support surface;

-when the bottle holder (1) is moved to the first support section (3), the bottle holder (1) is in the non-filling station;

when the bottle support (1) moves to the second supporting section (4), the bottle support (1) is positioned at the bottle feeding station;

-when the bottle holder (1) is moved to the third support section (5), the bottle holder (1) is in the filling station;

-when the bottle holder (1) is moved to the fourth support section (6), the bottle holder (1) is in the reflow station;

when the bottle support (1) moves to the fifth supporting section (7), the bottle support (1) is at the bottle outlet station.

4. A filling mechanism according to claim 3, wherein the third support section (5) is smoothly connected to the fourth support section (6) by a transition section;

the vertical distance between the end of the transition section, which is close to the third support section (5), and the bottom surface of the support body is larger than the vertical distance between the end of the transition section, which is close to the fourth support section (6), and the bottom surface of the support body.

5. The filling mechanism of claim 1, wherein the filling assembly comprises:

the first base (8) is arranged above the supporting surface, and an opening capable of accommodating the bottle support (1) to penetrate is formed in the first base (8);

-a driving member (9), the driving member (9) being movably arranged between the first base (8) and the support surface; the drive element (9) has a drive shaft which is connected to the bottle support element (1);

the filling unit is arranged on one side of the first base (8) away from the supporting surface; the filling unit has a second base (10) for mounting the liquid reservoir (15), the filling section and the return section;

the filling part is capable of filling a solution into the respective filling bottle (2) when the bottle holder (1) is in the filling station.

6. The filling mechanism of claim 5, wherein the filling unit further comprises: a filling valve (11) provided on the second base (10);

the filling valve (11) comprises:

the valve body (12), the hollow and there is a valve core tube (13) coaxially arranged with it in the said valve body (12); a first space is formed between the valve body (12) and the valve core pipe (13); the valve body (12) is provided with a joint (14) communicated with the first space, and the joint (14) is communicated with the liquid storage tank (15) through a liquid inlet pipe (16); one end of the valve core pipe (13) is communicated with the vacuumizing piece;

the sliding sleeve (17) is sleeved on the valve core tube (13), and is in sliding connection with one side of the valve body (12) away from the vacuumizing piece; one end of the sliding sleeve (17) far away from the valve body (12) is provided with a sealing element, and when the bottle support (1) is positioned at the filling station, the sealing element can seal the bottle opening of the filling bottle (2);

a liquid level adjusting pipe (18), wherein the liquid level adjusting pipe (18) is arranged at the free end of the valve core pipe (13); the liquid level adjusting pipe (18) is communicated with the valve core pipe (13) and forms the reflux part;

the valve pipe (19) is sleeved on the liquid level adjusting pipe (18), and one end of the valve pipe (19) is connected with one end, far away from the vacuumizing piece, of the sliding sleeve (17); a second space is formed between the valve tube (19) and the liquid level adjusting tube (18), and the second space is communicated with the first space and forms the filling part.

7. A filling mechanism according to claim 6, wherein the evacuation member communicates with the reservoir (15) via a return conduit (20).

8. The filling mechanism of claim 6, wherein the seal comprises:

the sealing gasket (21) is annularly arranged at one end, far away from the vacuumizing piece, of the sliding sleeve (17);

and the elastic element (22) is sleeved on the sliding sleeve (17), and the elastic element (22) is positioned between the valve body (12) and the sealing gasket (21).

9. A liquid filling apparatus, comprising: a filling mechanism as claimed in any one of claims 1 to 8.