Quantitative adding device for plant detergent
By designing a quantitative tube and an open structure for the quantitative addition device of plant-based detergents, the problems of cumbersome operation and spillage in quantitative addition of plant-based detergents have been solved, achieving a convenient and pollution-free quantitative addition effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG DEWODUO BIOTECHNOLOGY CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-01
AI Technical Summary
Existing plant-based stain removers are cumbersome to add in precise quantities, are prone to spillage, and can contaminate hands or the environment.
Design a plant-based detergent dispensing device comprising a metering tube, threaded cap, stopcock, metering piston, push rod, and rubber stopper. The device achieves metered dispensing through a metering chamber and an opening structure, and adjusts the metering using a sleeve and scale. It is suitable for spray bottles of different capacities.
It achieves simple and non-spillable quantitative addition, avoiding hand and environmental pollution, and improving ease of operation and versatility.
Smart Images
Figure CN224184959U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of additive devices, and in particular to a quantitative additive device for plant-based detergents. Background Technology
[0002] Plant-based stain removers are specialized cleaners used to quickly remove dust and dirt from plant surfaces. They typically need to be diluted with water in a spray bottle according to a specific ratio before use. When adding the correct amount, the plant-based stain remover is usually poured from the bottle into a measuring cup or graduated cap, using the markings to determine the correct quantity. This method is somewhat cumbersome, and because the spray bottle's opening is usually small, adding the stain remover using a measuring cup or cap can easily cause spills, contaminating hands or the environment, making it inconvenient to use. Utility Model Content
[0003] To solve the above-mentioned technical problems, this utility model provides a plant-based detergent quantitative addition device that is simple to operate, does not cause the plant-based detergent to spill, avoids contamination of hands or the environment, and is convenient to operate.
[0004] This utility model discloses a metering device for adding plant-based detergents, comprising a metering tube with a metering chamber inside, and an upper opening communicating with the metering chamber at the upper end of the metering tube; it also includes a threaded cap, a stopcock, an actuator, a metering piston, a push rod, and a rubber stopper; a lower opening communicating with the metering chamber at the lower end of the metering tube; a threaded cap fitted onto the lower outer wall of the metering tube, the threaded cap having an internal thread matching the opening of a packaging bottle; a stopcock installed in the lower opening of the metering tube; and an actuator located on the lower middle side wall of the metering tube, the actuator communicating with the metering chamber. The metering chamber is connected to the main body. The metering piston is installed in the upper part of the metering chamber of the metering tube. A through hole is provided in the middle of the metering piston, and the push rod slides into the center hole of the stopcock. A rubber stopper is installed at the upper end of the push rod, which can block the through hole of the metering piston. The metering chamber of the metering tube, located between the starter and the metering piston, is the metering space. When using, open the cap of the plant cleaner packaging bottle, insert the threaded cap into the bottle mouth, and tighten the threaded cap with the bottle mouth thread. At this time, the starter is located inside the packaging bottle. Invert the packaging bottle so that the plant cleaner inside the packaging bottle... The plant-based detergent enters the metering chamber of the metering tube through the opening. Air in the metering chamber is discharged through the upper opening of the metering tube. Once the metering chamber is full of the plant-based detergent, the push rod is pushed upwards, pressing the rubber stopper against the lower end face of the metering piston, thus blocking the through hole of the metering piston. The packaging bottle is then inverted, allowing the plant-based detergent in the metering chamber below the metering piston to discharge through the upper opening, while the plant-based detergent in the metering chamber above the opening is discharged through the opening. At this point, the metering... The metering chamber of the tube is located in the metering space between the starter and the metering piston, filled with plant-based detergent to achieve metering. Rotate the screw cap to disengage it from the bottle opening, remove the metering tube from the bottle, insert the metering tube into the spray bottle, and pull the push rod to disengage the rubber stopper from the metering piston, opening the through hole of the metering piston. This allows the metered amount of plant-based detergent to be added to the spray bottle through the through hole of the metering piston and the upper opening of the metering tube. The operation is simple, prevents the plant-based detergent from spilling, avoids contaminating hands or the environment, and is very convenient to operate.
[0005] Preferably, it also includes a sleeve and a scale. The metering piston is rotatably threaded to the inner wall of the metering tube. The sleeve is installed on the outer end face of the metering piston. The through hole of the sleeve and the metering piston are concentric with the upper opening of the metering tube. The outer wall of the metering tube is provided with a scale. The metering tube is made of transparent material. An Allen wrench is inserted into the sleeve through the upper opening of the metering tube. The sleeve is rotated by the Allen wrench. The sleeve drives the metering piston to rotate, thereby adjusting the position of the metering piston under the action of the thread. The position of the metering piston is determined by the scale, thereby adjusting the metering of the plant cleaner. It is suitable for sprayers of different capacities and has good versatility.
[0006] Preferably, it also includes a pointed nozzle, with the upper end of the metering tube being a pointed nozzle; by setting the pointed nozzle, the upper end of the metering tube can be inserted into a small-diameter spray bottle, improving versatility.
[0007] Preferably, it also includes a crossbar and a ball. The crossbar is mounted on the metering piston, and the ball is mounted on the crossbar with the ball facing the rubber stopper. The rubber stopper has a spherical groove and is made of elastic material. The ball can be inserted into the spherical groove of the rubber stopper. When the rubber stopper is pushed and pressed against the metering piston by the push rod, the ball is inserted into the spherical groove of the rubber stopper. When the push rod is released, the rubber stopper and the metering piston remain sealed. When the metering tube is inserted into the spray bottle, the push rod pulls the rubber stopper, causing the ball to disengage from the spherical groove, which can open the through hole of the metering piston and improve reliability.
[0008] Preferably, it also includes a limiting protrusion ring and a retaining ring. The limiting protrusion ring is provided on the inner wall of the metering tube and is located above the opening. The retaining ring is slidably mounted on the push rod and is located below the limiting protrusion ring. The retaining ring is blocked by the limiting protrusion ring and its density is greater than that of the plant-based detergent. When the metering tube is inserted into the mouth of the plant-based detergent packaging bottle and the packaging bottle is inverted, the retaining ring falls below the opening. At this time, the plant-based detergent can enter the metering chamber of the metering tube through the opening. When the packaging bottle is upright, the retaining ring falls onto the limiting protrusion ring, causing the retaining ring to cut the metering tube and reduce the leakage of the metered plant-based detergent through the opening.
[0009] Preferably, it also includes internal threads, lower external threads, and upper external threads. A threaded hole is provided in the middle of the threaded cap, and an internal thread is provided on the inner wall of the threaded hole. A lower external thread is provided on the lower outer wall of the metering tube, located below the opening. An upper external thread is provided on the upper outer wall of the metering tube. When the amount of plant-based cleaning agent in the packaging bottle is relatively large, the threaded cap is threadedly connected to the lower external thread through the internal thread. At this time, the metering tube can be fully inserted into the packaging bottle, allowing the plant-based cleaning agent to enter the metering chamber of the metering tube for metering through the opening. When the amount of plant-based cleaning agent in the packaging bottle is relatively small, the threaded cap is threadedly connected to the upper external thread through the internal thread, blocking the opening. At this time, only the upper end of the metering tube extends into the packaging bottle, allowing the plant-based cleaning agent to enter the metering chamber of the metering tube for metering through the upper opening. This design offers good practicality.
[0010] Preferably, it also includes a top spring. The stopcock is rotatably screwed into the lower opening of the metering tube. The lower end of the top spring is connected to the stopcock, and the upper end of the top spring contacts the retaining ring. When the threaded cap is screwed to the lower external thread through the internal thread, the stopcock is rotated towards the lower end of the metering tube, so that the top spring does not restrict the position of the retaining ring. At this time, the retaining ring moves flexibly. When the metering tube is reversed, the retaining ring is blocked by the limiting protrusion ring to reduce the spillage of plant cleaning agent. When the threaded cap is screwed to the upper external thread through the internal thread, the stopcock is rotated towards the upper end of the metering tube, so that the top spring elastically presses the retaining ring against the limiting protrusion ring, so that the retaining ring isolates the metering tube. At this time, there is no need for special blocking and start-up, simplifying the operation.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The metering chamber of the metering tube, located between the opening and the metering piston, is the metering space. In use, the cap of the plant-based detergent packaging bottle is opened, the threaded cap is inserted into the bottle opening, and the threaded cap is tightened to the bottle opening thread. At this time, the opening is located inside the packaging bottle. The packaging bottle is then inverted, allowing the plant-based detergent inside the packaging bottle to enter the metering chamber of the metering tube through the opening. Air in the metering chamber is discharged through the upper opening of the metering tube. When the plant-based detergent fills the metering chamber, the push rod is pushed upwards, causing the push rod to press the rubber stopper against the lower end face of the metering piston, thus blocking the through hole of the metering piston. The packaging bottle is then inverted, allowing... The plant-based detergent in the metering chamber below the metering piston is discharged through the upper opening, while the plant-based detergent in the metering chamber above the starter is discharged through the starter. At this time, the metering chamber of the metering tube, located in the metering space between the starter and the metering piston, is filled with plant-based detergent, achieving metering. Rotate the screw cap to disengage it from the bottle opening, remove the metering tube from the bottle, insert the metering tube into the spray bottle, and pull the push rod to disengage the rubber stopper from the metering piston, opening the through hole of the metering piston. This allows the metered plant-based detergent to be added to the spray bottle through the through hole of the metering piston and the upper opening of the metering tube. The operation is simple, prevents the plant-based detergent from spilling, avoids contaminating hands or the environment, and is very convenient. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model;
[0013] Figure 2 This is a front cross-sectional view of the present invention applicable to a full bottle state;
[0014] Figure 3 This is a front cross-sectional structural diagram of the present invention applicable to empty bottles.
[0015] Figure 4 This is a schematic diagram of the structure of this utility model applicable to a full bottle state;
[0016] Figure 5 This is a schematic diagram of the structure of this utility model applicable to empty bottles;
[0017] Figure 6 This is a structural schematic diagram of the present invention in its disassembled state.
[0018] The following labels are used in the attached diagram: 1. Metering tube; 2. Threaded cap; 3. Stopcock; 4. Start; 5. Metering piston; 6. Push rod; 7. Rubber stopper; 8. Sleeve; 9. Scale; 10. Nozzle; 11. Crossbar; 12. Ball column; 13. Limiting convex ring; 14. Retaining ring; 15. Internal thread; 16. Lower external thread; 17. Upper external thread; 18. Top spring. Detailed Implementation
[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.
[0020] Example 1
[0021] like Figures 1 to 6 As shown, a plant-based detergent dispensing device includes a dispensing tube 1 with a dispensing chamber inside. The upper end of the dispensing tube 1 has an upper opening communicating with the dispensing chamber. It also includes a threaded cap 2, a stopcock 3, an opening 4, a dispensing piston 5, a push rod 6, and a rubber stopper 7. The lower end of the dispensing tube 1 has a lower opening communicating with the dispensing chamber. The threaded cap 2 is fitted onto the lower outer wall of the dispensing tube 1 and has an internal thread matching the bottle opening. The stopcock 3 is installed in the lower opening of the dispensing tube 1. The opening 4 is located on the lower middle side wall of the dispensing tube 1 and communicates with the dispensing chamber. The dispensing piston 5 is installed in the upper part of the dispensing chamber of the dispensing tube 1 and has a through hole in its middle. The push rod 6 slides into the middle of the stopcock 3. The device includes a push rod 6 with a rubber stopper 7 installed at the upper end, which blocks the through hole of the metering piston 5; it also includes a sleeve 8 and a scale 9, the metering piston 5 is rotatably threaded to the inner wall of the metering tube 1, the sleeve 8 is installed on the outer end face of the metering piston 5, the sleeve 8 is concentric with the through hole of the metering piston 5 and the upper opening of the metering tube 1, the scale 9 is set on the outer wall of the metering tube 1, and the metering tube 1 is made of transparent material; it also includes a nozzle 10, the upper end of the metering tube 1 is set as a nozzle 10; it also includes a crossbar 11 and a ball column 12, the crossbar 11 is installed on the metering piston 5, the ball column 12 is installed on the crossbar 11, the ball column 12 faces the rubber stopper 7, the rubber stopper 7 is provided with a spherical groove, the rubber stopper 7 is made of elastic material, and the ball column 12 can be inserted into the spherical groove of the rubber stopper 7.
[0022] The metering chamber of the metering tube 1, located between the opening 4 and the metering piston 5, is the metering space. Using an Allen wrench, insert it into the sleeve 8 at the upper opening of the metering tube 1. Rotating the sleeve 8 with the Allen wrench causes the sleeve 8 to rotate, thus adjusting the position of the metering piston 5 under the action of the thread. The position of the metering piston 5 is determined by the scale 9, thereby adjusting the metering of the plant-based detergent. It is suitable for spray bottles of different capacities and has good versatility. When using, open the cap of the plant-based detergent bottle and insert the threaded cap 2 into the bottle opening. Tighten the threaded cap 2 to the bottle neck thread. At this time, the actuator 4 is inside the packaging bottle. Invert the packaging bottle so that the plant-based detergent inside the packaging bottle enters the metering chamber of the metering tube 1 through the actuator 4. The air in the metering chamber is discharged through the upper opening of the metering tube 1. When the plant-based detergent fills the metering chamber of the metering tube 1, push the push rod 6 upward so that the push rod 6 presses the rubber stopper 7 against the lower end face of the metering piston 5. When the rubber stopper 7 is pushed and pressed against the metering piston 5 by the push rod 6, the ball column 12 is inserted into the spherical groove of the rubber stopper 7. Release the push rod 6, keeping the rubber stopper 7 sealed to the metering piston 5, thus blocking the through hole of the metering piston 5. Turn the bottle over, allowing the plant-based detergent in the metering chamber below the metering piston 5 to drain through the upper opening, and simultaneously, the plant-based detergent in the metering chamber above the opening 4 to drain through the opening 4. At this point, the metering chamber of the metering tube 1, located in the metering space between the opening 4 and the metering piston 5, is filled with plant-based detergent, achieving metering. Rotate the threaded cap 2 to detach it from the bottle opening, removing the metering tube 1 from the bottle. Remove the tube, and by setting the nozzle 10, the upper end of the metering tube 1 can be inserted into the small-diameter spray bottle. Pull up the push rod 6. After the metering tube 1 is inserted into the spray bottle, the push rod 6 pulls the rubber stopper 7, causing the ball column 12 to disengage from the spherical groove. This causes the push rod 6 to drive the rubber stopper 7 to disengage from the metering piston 5, opening the through hole of the metering piston 5. This allows the metered amount of plant cleaner to be added to the spray bottle through the through hole of the metering piston 5 and the upper opening of the metering tube 1. The operation is simple, does not cause the plant cleaner to spill, avoids contaminating hands or the environment, and is very convenient to operate.
[0023] Example 2
[0024] like Figure 3 , Figure 5 and Figure 6As shown, based on Embodiment 1, it also includes a limiting protrusion ring 13 and a retaining ring 14. The limiting protrusion ring 13 is provided on the inner wall of the metering tube 1, and the limiting protrusion ring 13 is located above the opening 4. The retaining ring 14 is slidably mounted on the push rod 6, and the retaining ring 14 is located below the limiting protrusion ring 13. The retaining ring 14 is blocked by the limiting protrusion ring 13, and the density of the retaining ring 14 is greater than the density of the plant-based detergent. It also includes an internal thread 15, a lower external thread 16, and an upper external thread 17. The threaded cap 2 is provided with a threaded hole in the middle, and the inner wall of the threaded hole is provided with an internal thread 15. The lower external thread 16 is provided on the lower outer wall of the metering tube 1, and the lower external thread 16 is located below the opening 4. The upper external thread 17 is provided on the upper outer wall of the metering tube 1. It also includes a top spring 18. The stopcock 3 is rotatably screwed into the lower opening of the metering tube 1. The lower end of the top spring 18 is connected to the stopcock 3, and the upper end of the top spring 18 is in contact with the retaining ring 14.
[0025] When the amount of plant-based cleaning agent in the packaging bottle is relatively large, the threaded cap 2 is threadedly connected to the lower external thread 16 via the internal thread 15. When the threaded cap 2 is threaded to the lower external thread 16 via the internal thread 15, the stopcock 3 is rotated towards the lower end of the metering tube 1, so that the top spring 18 does not restrict the position of the retaining ring 14. At this time, the retaining ring 14 moves flexibly. When the metering tube 1 is reversed, the retaining ring 14 is blocked by the limiting protrusion ring 13 to reduce the spillage of the plant-based cleaning agent. At this time, the metering tube 1 can be fully inserted into the packaging bottle, allowing the plant-based cleaning agent to enter the metering chamber of the metering tube 1 through the opening 4 for metering. When the packaging bottle is inverted, the retaining ring 14 falls below the opening 4, at which time the plant-based cleaning agent can enter the metering chamber of the metering tube 1 through the opening 4. When the packaging bottle is upright, the retaining ring 14 falls onto the limiting protrusion ring 13, causing the retaining ring 14 to cut off the metering tube 1, reducing the leakage of the metered plant cleaner through the opening 4. When the amount of plant cleaner in the packaging bottle is small, the threaded cap 2 is threaded to the upper external thread 17 through the internal thread 15. When the threaded cap 2 is threaded to the upper external thread 17 through the internal thread 15, the stopcock 3 is rotated toward the upper end of the metering tube 1, so that the top spring 18 elastically presses the retaining ring 14 onto the limiting protrusion ring 13, so that the retaining ring 14 isolates the metering tube 1. At this time, there is no need to block the opening 4. At this time, only the upper end of the metering tube 1 extends into the packaging bottle, so that the plant cleaner enters the metering chamber of the metering tube 1 through the upper opening of the metering tube 1 for metering.
[0026] like Figures 1 to 6As shown, this utility model discloses a plant-based detergent dispensing device. During operation, the cap of the plant-based detergent packaging bottle is first opened. The threaded cap 2 is threadedly connected to the lower external thread 16 via the internal thread 15. The dispensing tube 1 is inserted into the bottle opening, and the threaded cap 2 is tightened to the bottle opening thread. At this time, the actuator 4 is located inside the packaging bottle. The packaging bottle is then inverted, allowing the plant-based detergent inside to enter the dispensing chamber of the dispensing tube 1 through the actuator 4. Air in the dispensing chamber is discharged through the upper opening of the dispensing tube 1. When the dispensing detergent fills the dispensing chamber of the dispensing tube 1, the push rod 6 is pushed upwards, causing the push rod 6 to press the rubber stopper 7 against the lower end face of the dispensing piston 5. This causes the rubber stopper 7 to block the through hole of the dispensing piston 5, and the ball column 12 is inserted into the spherical groove of the rubber stopper 7. Finally, the packaging bottle is inverted. The plant-based detergent in the metering chamber below the metering piston 5 is discharged through the upper opening, while the plant-based detergent in the metering chamber above the opening 4 is discharged through the opening 4. The retaining ring 14 falls onto the limiting protrusion 13, causing the retaining ring 14 to cut the metering tube 1, reducing leakage of the metered plant-based detergent through the opening 4. At this time, the metering chamber of the metering tube 1, located in the metering space between the opening 4 and the metering piston 5, is filled with plant-based detergent, achieving metering. Finally, rotate the threaded cap 2 to disengage from the bottle opening, remove the metering tube 1 from the bottle, insert the metering tube 1 into the spray bottle, and pull the push rod 6, causing the push rod 6 to drive the rubber stopper 7 to disengage from the metering piston 5, opening the through hole of the metering piston 5, so that the metered plant-based detergent can be added to the spray bottle through the through hole of the metering piston 5 and the upper opening of the metering tube 1.
[0027] The main functions achieved by this utility model are:
[0028] 1. Simple to operate, will not cause plant-based stain remover to spill, avoids contamination of hands or environment, and is easy to operate;
[0029] 2. By setting a retaining ring 14 to cut off the metering tube 1, the leakage of the metered plant detergent through the start-up 4 is reduced;
[0030] 3. Able to adjust the quantitative amount;
[0031] 4. It has two working states: full bottle and empty bottle when using plant-based detergent.
[0032] The quantitative addition device for plant-based detergents of this utility model uses common mechanical methods for installation, connection, or setting. Any method that can achieve the desired beneficial effect can be implemented. The quantitative tube 1, threaded cap 2, stopcock 3, quantitative piston 5, push rod 6, rubber stopper 7, sleeve 8, scale 9, ball column 12, retaining ring 14, internal thread 15, lower external thread 16, upper external thread 17, and top spring 18 of the quantitative addition device for plant-based detergents of this utility model are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.
[0033] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A device for quantitatively adding plant-based detergents, comprising a metering tube (1), wherein a metering chamber is provided inside the metering tube (1), and an upper opening communicating with the metering chamber is provided at the upper end of the metering tube (1); characterized in that, It also includes a threaded cap (2), a stopcock (3), an opening (4), a metering piston (5), a push rod (6), and a rubber stopper (7). The lower end of the metering tube (1) is provided with a lower opening that communicates with the metering chamber. The threaded cap (2) is fitted on the lower outer wall of the metering tube (1). The threaded cap (2) is provided with an internal thread that matches the bottle opening. The stopcock (3) is installed in the lower opening of the metering tube (1). The opening (4) is provided on the middle and lower side wall of the metering tube (1). The opening (4) communicates with the metering chamber. The metering piston (5) is installed in the upper part of the metering chamber of the metering tube (1). The metering piston (5) is provided with a through hole in the middle part. The push rod (6) is slidably inserted into the center hole of the stopcock (3). The upper end of the push rod (6) is equipped with a rubber stopper (7). The rubber stopper (7) can block the through hole of the metering piston (5).
2. The plant decontaminant dosing device of claim 1, wherein, It also includes a sleeve (8) and a scale (9). The metering piston (5) is rotatably threaded to the inner wall of the metering tube (1). The sleeve (8) is installed on the outer end face of the metering piston (5). The through hole of the sleeve (8) and the upper opening of the metering tube (1) are concentric. The scale (9) is set on the outer wall of the metering tube (1). The metering tube (1) is made of transparent material.
3. The plant decontaminant dosing device of claim 1, wherein, It also includes a nozzle (10), and the upper end of the metering tube (1) is set as a nozzle (10).
4. The plant decontaminant dosing device of claim 1, wherein, It also includes a crossbar (11) and a ball column (12). The crossbar (11) is mounted on the metering piston (5), and the ball column (12) is mounted on the crossbar (11). The ball column (12) faces the rubber stopper (7). The rubber stopper (7) is provided with a spherical groove. The rubber stopper (7) is made of elastic material, and the ball column (12) can be inserted into the spherical groove of the rubber stopper (7).
5. The plant-based detergent quantitative addition device as described in claim 1, characterized in that, It also includes a limiting protrusion ring (13) and a retaining ring (14). The limiting protrusion ring (13) is provided on the inner wall of the metering tube (1). The limiting protrusion ring (13) is located above the start (4). The retaining ring (14) is slidably installed on the push rod (6). The retaining ring (14) is located below the limiting protrusion ring (13). The retaining ring (14) is blocked by the limiting protrusion ring (13). The density of the retaining ring (14) is greater than the density of the plant desiccant.
6. A plant decontaminant dosing device as claimed in claim 5, wherein, It also includes an internal thread (15), a lower external thread (16) and an upper external thread (17). The threaded cap (2) has a threaded hole in the middle, and the inner wall of the threaded hole has an internal thread (15). The lower external thread (16) is provided on the lower outer wall of the metering tube (1). The lower external thread (16) is located below the start (4). The upper external thread (17) is provided on the upper outer wall of the metering tube (1).
7. A plant decontaminant dosing device as claimed in claim 6, characterised in that, It also includes a top spring (18), a stopcock (3) is rotatably screwed into the lower opening of the metering tube (1), the lower end of the top spring (18) is connected to the stopcock (3), and the upper end of the top spring (18) is in contact with the retaining ring (14).