Metering discharging device

By designing a metering feeding device and utilizing components such as sliders, clamps, and limiting mechanisms, the problem of inaccurate material feeding in biotechnology experiments has been solved. This has enabled precise control of material feeding and equipment stability, simplified the operation process, and improved the reliability and efficiency of experiments.

CN224172725UActive Publication Date: 2026-04-28CHONGQING HUACUI BIO TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHONGQING HUACUI BIO TECH
Filing Date
2025-04-28
Publication Date
2026-04-28

AI Technical Summary

Technical Problem

The lack of a real-time feedback mechanism for material weight changes in existing biotechnology experiments makes it impossible to accurately control the amount of feed, affecting the repeatability and accuracy of experimental results. In addition, traditional feeding equipment is complex to operate, prone to errors and positional deviations, increasing maintenance costs and downtime.

Method used

A metering feeding device was designed, including a support sleeve, a sliding column, a spring, a placement plate, and a storage bin. Through the cooperation of components such as a slider, a clamping plate, and a limiting mechanism, the device achieves real-time feedback and precise control of the material weight, ensuring positional stability and synchronous adjustment.

Benefits of technology

It enables precise control of material input, improves the repeatability and accuracy of experiments, simplifies the operation process, reduces errors and positional deviations, and enhances the stability and maintenance efficiency of the equipment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a measurable emptying device which comprises a bottom frame, a metering mechanism is arranged on the bottom frame, the metering mechanism comprises a supporting sleeve, a sliding column, a spring, a placing plate and a material storage barrel, and an adjusting mechanism is arranged at the top end of the spring. The adjusting mechanism comprises an outer sleeve, sliding rods, sliding blocks, telescopic springs, clamping plates, a sliding groove, a sliding sleeve, a pushing sleeve and a limiting mechanism, the outer sleeve is arranged on the outer side of the sliding column and abuts against the top end of the spring, the multiple sets of sliding rods are distributed on the inner side of the outer sleeve, the sliding columns are sleeved with the movable outer sleeve, the multiple sliding rods are arranged on the inner side of the sliding columns, and the sliding blocks are slidably connected to the sliding rods; the telescopic spring is connected in the sliding block, the upper end of the sliding block is connected with the clamping plate, when the outer sleeve moves downwards, extra pre-pressing can be applied to the spring to adjust the bearing range, the compression spring below is further extruded, buffering and stable releasing of adjusting force are achieved, it is guaranteed that the adjusting action is stable and reliable, and various materials and application requirements are met.
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Description

Technical Field

[0001] This utility model relates to the field of biotechnology, and more specifically, to a metering feeding device. Background Technology

[0002] In the field of biotechnology, the precise delivery and control of materials are crucial in experimental ingredient preparation, cell culture, enzyme reactions, drug synthesis or other biological processes. In these processes, the type, weight and volume of materials may change with time, environmental conditions or experimental requirements.

[0003] The lack of a real-time feedback mechanism for changes in the weight of materials in existing technologies makes it impossible to precisely control the amount of material added each time, which affects the repeatability and accuracy of experimental results. Especially when conducting high-precision experiments, such as gene editing, cell culture, and protein expression, errors in material addition may lead to experimental failure or unstable data, or even waste of resources.

[0004] Furthermore, biotechnology experiments often require frequent parameter adjustments, especially when using multiple reagents, culture media, or cell lines. Traditional feeding equipment in such applications often requires frequent manual disassembly, reassembly, and recalibration, which increases the complexity and time cost of operation. If the equipment lacks precise adjustment limits and stable support, errors or positional shifts may occur during the adjustment process, leading to uncontrollable experimental results. In addition, the difficulty of equipment maintenance and replacement of parts may increase downtime, affecting the continuity and efficiency of the experiment. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the problems existing in the prior art, the present invention provides a metering feeding device to solve the technical problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a metering feeding device, comprising a base frame, on which a metering mechanism is provided. The metering mechanism includes a support sleeve, a sliding column, a spring, a placement plate, and a storage bin. The support sleeve is fixed to the top surface of the base frame, the sliding column slides within the support sleeve, the spring is fixed to the top surface of the base frame, the placement plate is fixed to the top surface of the sliding column, and the storage bin is placed on the top surface of the placement plate. An adjustment mechanism is provided at the top of the spring. The adjustment mechanism includes an outer sleeve, a sliding rod, a slider, a telescopic spring, a clamping plate, a sliding groove, a sliding sleeve, a push sleeve, and a limiting mechanism. The outer sleeve is disposed on the outside of the sliding column and abuts against the top of the spring. Multiple sets of sliding rods are distributed inside the outer sleeve. The slider slides on the outer walls of multiple sets of sliding rods. Multiple sets of telescopic springs are respectively connected to the inner sides of multiple sets of sliders. Multiple sets of clamping plates are respectively installed on the tops of multiple sets of telescopic springs. Multiple sets of sliding grooves are distributed outside the outer sleeve. The sliding sleeve slides within multiple sets of sliding grooves. The push sleeve is fixed inside the sliding sleeve.

[0009] The present invention is further configured such that the limiting mechanism includes a connecting sleeve, a mounting block, an arc rod, a rotating sleeve, a support rod, and a sliding hole. The connecting sleeve is fixed on the top surface of the sliding sleeve. Multiple sets of mounting blocks are distributed on the outer wall of the connecting sleeve. Multiple sets of arc rods are respectively fixed on the outer walls of multiple sets of mounting blocks. The rotating sleeve rotates on the outer wall of the outer sleeve. Multiple sets of support rods are fixed on the outer wall of the rotating sleeve. Multiple sets of sliding holes are respectively arranged on multiple sets of support rods and respectively inserted into multiple sets of arc rods.

[0010] The present invention is further configured such that the bottom surface of the placement plate is provided with a limiting rod, and multiple sets of the limiting rod are provided; the top surface of the base frame is provided with a limiting sleeve, and multiple sets of the limiting sleeve are provided and are slidably connected to multiple sets of limiting rods respectively. The slidable connection between the limiting rod and the limiting sleeve can realize the precise adjustment of the position of the placement plate, ensure the stability and reliability of the placement plate during use, and prevent position deviation.

[0011] The present invention is further configured such that a metering groove is provided on the outer wall of the sliding column, and multiple sets of metering grooves are distributed on the outer wall of the sliding column with the same spacing. The setting of the metering groove helps to accurately control the amount of material fed. Through the design of multiple sets of metering grooves with the same spacing, the consistency and accuracy of the amount of material fed each time are guaranteed.

[0012] The present invention is further configured such that each of the multiple sets of sliding rods is provided with a limiting strip on its outer wall, and the multiple sets of limiting strips are slidably connected to the multiple sets of sliders respectively. The slidable connection between the limiting strips and the sliders can effectively limit the movement range of the sliders, ensuring that each component of the dispensing device moves within the set range and avoiding errors caused by over-adjustment.

[0013] The present invention is further provided with rubber strips on the inner side of multiple sets of clamping plates. The rubber strips are provided in multiple sets. The rubber strips can enhance the friction between the clamping plates and the material, ensure the material is firmly fixed and prevent the material from slipping or shifting during the feeding process, thereby improving stability.

[0014] The present invention is further configured such that a compression spring is connected to the inner side of the outer sleeve, and a push ring is installed at the bottom end of the compression spring. The design of the compression spring and the push ring provides elastic support, ensuring that appropriate pressure can be generated during operation, thereby adjusting the feeding or clamping force of the material and maintaining the stability of the equipment.

[0015] The present invention is further configured such that the outer wall of the outer sleeve is provided with a positioning groove, and multiple sets of positioning grooves are provided. The inner wall of the rotating sleeve is connected with a force spring, and multiple sets of force springs are provided, each with a positioning block fixed at its top. The multiple sets of positioning blocks are engaged in the positioning groove. The positioning groove and the force spring work together to ensure that the rotating sleeve is accurately positioned during operation, avoiding instability caused by errors. The engaging design of the positioning blocks provides stable support and precise adjustment function.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a metering feeding device, which has the following beneficial effects:

[0018] 1. By setting a support sleeve on the base, a sliding column is slidably connected inside the support sleeve. A placement plate is fixed on the upper part of the sliding column to support the storage bucket. When the material is filled into the storage bucket, its gravity will press the placement plate, thereby driving the sliding column to move downward. At the same time, it compresses the spring located below the sliding column. The spring is fixed to the top of the base frame, thereby generating measurable displacement feedback. This process causes the metering groove on the sliding column to form a relative displacement with the support sleeve. Multiple metering grooves arranged at equal intervals can intuitively reflect the degree of compression, thereby accurately corresponding to the weight of the material, improving the accuracy and real-time performance of quantitative measurement, avoiding over- or under-quantity, and ensuring stable proportioning.

[0019] 2. By installing a movable outer sleeve over the sliding column, multiple sliding rods are installed inside the sleeve. Sliding blocks are slidably connected to the sliding rods, and telescopic springs are connected inside the sliding blocks. The upper end is connected to a clamping plate. When the outer sleeve moves downward, additional preload can be applied to the spring to adjust the bearing range. Then, the sliding column is manually slid upward. By pushing the sliding sleeve, the push sleeve drives the push sleeve, which simultaneously pushes multiple sliding blocks along the sliding rods. This drives the clamping plate to clamp the outer wall of the sliding column inward and compress the telescopic spring, so that the adjusting force is evenly applied to the sliding column, effectively improving the synchronization and stability during the adjustment process. During the sliding process, the sliding block also pushes down the push ring located inside the outer sleeve, further squeezing the compression spring below, realizing the buffering and stable release of the adjusting force, ensuring smooth and reliable adjustment action, and adapting to various materials and application requirements.

[0020] 3. By setting a connecting sleeve at the top of the sliding sleeve, multiple mounting blocks are arranged on the outside of the connecting sleeve, and an arc-shaped rod is fixedly connected to the outside of the mounting blocks. The arc-shaped rod is inserted into multiple sliding holes set on the support rod. The outer wall of the support rod is installed on the rotating sleeve. The rotating sleeve can rotate on the outer wall of the outer sleeve. After the position of the sliding sleeve is adjusted, rotating the rotating sleeve clockwise can make the sliding hole and the arc-shaped rod complete the limit, thereby locking the sliding sleeve and preventing the adjustment position from loosening or shifting. At the same time, multiple force springs are connected to the inner wall of the rotating sleeve, and positioning blocks are fixed at the top of the force springs. After the limit action is completed, the positioning blocks automatically engage with multiple positioning grooves set on the outer wall of the outer sleeve to achieve angular positioning of the rotating sleeve and ensure the stability and reliability after the limit is set. When it is necessary to disassemble the outer sleeve, simply rotate the rotating sleeve counterclockwise to make the sliding hole disengage from the arc-shaped rod. Under the elastic force of the compression spring, the push ring resets and drives the slider to slide in the opposite direction, causing the clamp to release the sliding column. The limit device is released simultaneously. The whole disassembly is convenient, easy to maintain and adjust, and improves the operating efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a metering feeding device according to the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of the sliding column and the support sleeve in this utility model;

[0023] Figure 3 This is a cross-sectional view of the adjustment mechanism in this utility model;

[0024] Figure 4 This is a cross-sectional view of the rotating sleeve in this utility model;

[0025] Figure 5 This is a cross-sectional view of the outer sleeve in this utility model.

[0026] In the diagram: 1. Base frame; 2. Support sleeve; 3. Sliding column; 4. Spring; 5. Placement plate; 6. Storage bucket; 7. Outer sleeve; 8. Sliding rod; 9. Sliding block; 10. Telescopic spring; 11. Clamping plate; 12. Sliding groove; 13. Sliding sleeve; 14. Push sleeve; 15. Connecting sleeve; 16. Mounting block; 17. Arc rod; 18. Rotating sleeve; 19. Support rod; 20. Sliding hole; 21. Limiting rod; 22. Limiting sleeve; 23. Metering groove; 24. Limiting strip; 25. Rubber strip; 26. Compression spring; 27. Push ring; 28. Positioning groove; 29. ​​Force spring; 30. Positioning block. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0030] Please see Figures 1-5 A metering feeding device includes a base frame 1, on which a metering mechanism is mounted. The metering mechanism includes a support sleeve 2, a sliding column 3, a spring 4, a placement plate 5, and a storage bin 6. The support sleeve 2 is fixed to the top surface of the base frame 1, the sliding column 3 slides within the support sleeve 2, the spring 4 is fixed to the top surface of the base frame 1, the placement plate 5 is fixed to the top surface of the sliding column 3, and the storage bin 6 is placed on the top surface of the placement plate 5. An adjustment mechanism is mounted at the top of the spring 4, and the adjustment mechanism includes an outer sleeve 7, a sliding rod 8, a slider 9, a telescopic spring 10, a clamping plate 11, and a sliding arm. The system includes a groove 12, a sliding sleeve 13, a push sleeve 14, and a limiting mechanism. The outer sleeve 7 is located outside the sliding column 3 and abuts against the top of the spring 4. Multiple sets of sliding rods 8 are distributed inside the outer sleeve 7. The slider 9 slides on the outer wall of multiple sets of sliding rods 8. Multiple sets of telescopic springs 10 are respectively connected to the inner side of multiple sets of sliders 9. Multiple sets of clamping plates 11 are respectively installed on the top of multiple sets of telescopic springs 10. Multiple sets of sliding grooves 12 are distributed outside the outer sleeve 7. The sliding sleeve 13 slides inside multiple sets of sliding grooves 12. The push sleeve 14 is fixed inside the sliding sleeve 13.

[0031] The limiting mechanism includes a connecting sleeve 15, a mounting block 16, an arc-shaped rod 17, a rotating sleeve 18, a support rod 19, and a sliding hole 20. The connecting sleeve 15 is fixed to the top surface of the sliding sleeve 13. Multiple sets of mounting blocks 16 are distributed on the outer wall of the connecting sleeve 15. Multiple sets of arc-shaped rods 17 are respectively fixed on the outer walls of multiple sets of mounting blocks 16. The rotating sleeve 18 rotates on the outer wall of the outer sleeve 7. Multiple sets of support rods 19 are fixed on the outer wall of the rotating sleeve 18. Multiple sets of sliding holes 20 are respectively provided on multiple sets of support rods 19 and are respectively inserted into multiple sets of arc-shaped rods 17.

[0032] The bottom surface of the placement plate 5 is provided with a limiting rod 21, and multiple sets of limiting rods 21 are provided. The top surface of the base frame 1 is provided with a limiting sleeve 22, and multiple sets of limiting sleeves 22 are provided and are slidably connected to multiple sets of limiting rods 21 respectively. The limiting rods 21 and the limiting sleeves 22 are slidably connected, so that the placement plate 5 can be limited and adjusted on the base frame 1, thereby ensuring the stability and repeatability of its installation position.

[0033] The outer wall of the slide column 3 is provided with a metering groove 23. Multiple sets of metering grooves 23 are distributed on the outer wall of the slide column 3 with the same spacing. Multiple sets of metering grooves 23 with equal spacing can be used to accurately control the movement of the slide column 3 or the amount of material distributed, thereby improving the consistency and accuracy of the processing or operation.

[0034] Each set of sliding rods 8 has a limiting strip 24 on its outer wall. The limiting strips 24 are slidably connected to the sliders 9. The sliding connection structure between the limiting strips 24 and the sliders 9 can effectively limit the movement range of the sliders 9 on the sliding rods 8 and prevent excessive sliding or deviation from the set trajectory.

[0035] The inner side of each set of clamping plates 11 is provided with rubber strips 25. There are multiple sets of rubber strips 25. The rubber strips 25 increase the friction between the clamping plates 11 and the clamped object, and at the same time play a buffering and protective role, effectively preventing the object from slipping or being damaged.

[0036] A compression spring 26 is connected to the inner side of the outer sleeve 7. A push ring 27 is installed at the bottom of the compression spring 26. The compression spring 26 provides elastic force to push the push ring 27 to run, thereby realizing functions such as automatic reset or auxiliary clamping, and enhancing the elastic response capability of the structure.

[0037] The outer sleeve 7 has a positioning groove 28 on its outer wall. Multiple sets of positioning grooves 28 are provided. The inner wall of the rotating sleeve 18 is connected to a force spring 29. Multiple sets of force springs 29 are provided, and each has a positioning block 30 fixed at its top. Multiple sets of positioning blocks 30 are engaged in the positioning groove 28. The force spring 29 drives the positioning block 30 to engage with the positioning groove 28, realizing the segmented positioning function of the rotating sleeve 18 and enhancing the operational stability and positioning accuracy of the device.

[0038] In this embodiment, the material is conveyed into the storage bin 6. The weight of the material presses down on the placement plate 5, causing the sliding column 3 to drive the outer sleeve 7 to compress the spring 4. The material is measured by the degree of compression of the spring 4 and the relative position of the metering groove 23 and the support sleeve 2. When it is necessary to adjust the metering capacity, the outer sleeve 7 is moved to compress the spring 4, and then the sliding column 3 is slid upward. Then, the sliding sleeve 13 is pushed to drive the push sleeve 14 to push multiple sets of sliders 9, so that the sliders 9 slide along the sliding rod 8 and drive the clamping plate 11 to clamp the outer wall of the sliding column 3 and press the telescopic spring 10. At the same time, the multiple sets of sliders 9 push the push ring 27 to compress the compression spring 26. Then, the rotating sleeve 18 is rotated clockwise so that multiple sets of sliding holes 20 are inserted into the arc rod 17 to limit the sliding sleeve 13 and complete the adjustment.

[0039] More specifically, when it is necessary to disassemble the outer sleeve 7, rotating the rotating sleeve 18 counterclockwise causes the sliding hole 20 to disengage from the arc rod 17, thereby releasing the limiting position on the sliding sleeve 13. The compression spring 26 resets the position, and the push ring 27 pushes multiple sets of sliders 9 to slide along the sliding rod 8, thereby causing the clamping plate 11 to release the clamping position on the sliding column 3. After the rotating sleeve 18 stops rotating, multiple sets of force springs 29 push the positioning block 30 to engage in the positioning groove 28 to position the rotating sleeve 18.

[0040] In summary, during the use or operation of the overall equipment: the material is conveyed into the storage bin 6, and the weight of the material presses down on the placement plate 5, causing the sliding column 3 to drive the outer sleeve 7 to compress the spring 4. The material is metered by the degree of compression of the spring 4 and the relative position of the metering groove 23 and the support sleeve 2. When it is necessary to adjust the metering capacity, the outer sleeve 7 is moved to compress the spring 4, and then the sliding column 3 is slid upward. Then, the sliding sleeve 13 is pushed to drive the push sleeve 14 to push multiple sets of sliders 9, so that the sliders 9 slide along the sliding rod 8 and drive the clamping plate 11 to clamp the outer wall of the sliding column 3 and press the telescopic spring 10. At the same time, the multiple sets of sliders 9 push the push ring 27 to compress the compression spring 26. Then, the rotating sleeve 18 is rotated clockwise so that multiple sets of sliding holes 20 are inserted into the arc rod 17 to limit the sliding sleeve 13 and complete the adjustment.

[0041] When it is necessary to disassemble the outer sleeve 7, rotate the rotating sleeve 18 counterclockwise to release the sliding hole 20 from the insertion of the arc rod 17 and release the limiting of the sliding sleeve 13. The compression spring 26 resets the sleeve, and the push ring 27 pushes multiple sets of sliders 9 to slide along the sliding rod 8 and drives the clamping plate 11 to release the clamping of the sliding column 3. After the rotating sleeve 18 stops rotating, multiple sets of force springs 29 push the positioning block 30 to engage in the positioning groove 28 to position the rotating sleeve 18.

[0042] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A metering feeding device, comprising a base frame (1), characterized in that: A metering mechanism is provided on the base frame (1). The metering mechanism includes a support sleeve (2), a sliding column (3), a spring (4), a placement plate (5), and a storage bin (6). The support sleeve (2) is fixed to the top surface of the base frame (1), the sliding column (3) slides inside the support sleeve (2), the spring (4) is fixed to the top surface of the base frame (1), the placement plate (5) is fixed to the top surface of the sliding column (3), and the storage bin (6) is placed on the top surface of the placement plate (5). An adjustment mechanism is provided at the top of the spring (4). The adjustment mechanism includes an outer sleeve (7), a sliding rod (8), a slider (9), a telescopic spring (10), a clamping plate (11), and a sliding groove (12). 2) Sliding sleeve (13), push sleeve (14) and limiting mechanism. The outer sleeve (7) is set outside the sliding column (3) and abuts against the top of the spring (4). Multiple sets of sliding rods (8) are distributed inside the outer sleeve (7). The slider (9) slides on the outer wall of multiple sets of sliding rods (8). Multiple sets of telescopic springs (10) are respectively connected to the inner side of multiple sets of sliders (9). Multiple sets of clamping plates (11) are respectively installed on the top of multiple sets of telescopic springs (10). Multiple sets of sliding grooves (12) are distributed outside the outer sleeve (7). The sliding sleeve (13) slides in multiple sets of sliding grooves (12). The push sleeve (14) is fixed inside the sliding sleeve (13).

2. The metering feeding device according to claim 1, characterized in that: The limiting mechanism includes a connecting sleeve (15), a mounting block (16), an arc rod (17), a rotating sleeve (18), a support rod (19), and a sliding hole (20). The connecting sleeve (15) is fixed on the top surface of the sliding sleeve (13). Multiple sets of mounting blocks (16) are distributed on the outer wall of the connecting sleeve (15). Multiple sets of arc rods (17) are fixed on the outer walls of multiple sets of mounting blocks (16). The rotating sleeve (18) rotates on the outer wall of the outer sleeve (7). Multiple sets of support rods (19) are fixed on the outer wall of the rotating sleeve (18). Multiple sets of sliding holes (20) are respectively set on multiple sets of support rods (19) and are respectively inserted into multiple sets of arc rods (17).

3. The metering feeding device according to claim 2, characterized in that: The bottom surface of the placement plate (5) is provided with a limiting rod (21), and multiple sets of the limiting rod (21) are provided. The top surface of the base frame (1) is provided with a limiting sleeve (22), and multiple sets of the limiting sleeve (22) are provided and are slidably connected to multiple sets of limiting rods (21).

4. The metering feeding device according to claim 3, characterized in that: The outer wall of the sliding column (3) is provided with a metering groove (23), and the metering groove (23) is provided in multiple sets distributed on the outer wall of the sliding column (3) with the same spacing.

5. A metering feeding device according to claim 4, characterized in that: multiple sets Each of the slide bars (8) is provided with a limiting strip (24) on its outer wall, and multiple sets of the limiting strips (24) are slidably connected to multiple sets of the sliders (9).

6. A metering feeding device according to claim 5, characterized in that: multiple sets Each of the clamps (11) is provided with a rubber strip (25) on its inner side, and there are multiple sets of the rubber strip (25).

7. A metering feeding device according to claim 6, characterized in that: A compression spring (26) is connected to the inner side of the outer sleeve (7), and a push ring (27) is installed at the bottom end of the compression spring (26).

8. A metering feeding device according to claim 7, characterized in that: The outer sleeve (7) has a positioning groove (28) on its outer wall. There are multiple sets of positioning grooves (28). The inner wall of the rotating sleeve (18) is connected to a force spring (29). There are multiple sets of force springs (29), and each of them has a positioning block (30) fixed at its top. The multiple sets of positioning blocks (30) are engaged in the positioning groove (28).