Powder metering screw and powder metering device
By designing the thread structure and connection method of the powder metering screw, the problem of powder accumulation in the cavity is solved, the stable conveying and metering accuracy of powder is achieved, and the production efficiency and product quality are improved.
Patent Information
- Application Number
- CN202422625334.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-10-29
AI Technical Summary
The powder accumulates in the cavity to form powder blocks, resulting in the problem of reduced conveying speed and inaccurate metering.
A powder metering screw is designed, including a metering section, a first conveying section and a second conveying section. The thread radius of the metering section and the conveying section are equal, the pitch gradually increases, the thread covers the outer wall of the screw, and combines the equal-diameter cylinder and the connecting rod to ensure smooth transition and stable transport of the powder between each section.
It realizes stable and smooth conveying of powder, avoids the formation of powder blocks, improves metrological accuracy and production efficiency, reduces the probability of equipment failure, and ensures consistency of product quality.
Smart Images
Figure CN223254012U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of precise powder metering and conveying, in particular to a powder metering screw and a powder metering device. Background Art
[0002] Powder metering screws are widely used in the chemical industry, particularly in applications such as silicone rubber and lithium battery slurries. In conventional powder metering, metering screws typically feature threads with equal diameters and pitches throughout the entire shaft, with the metering and conveying sections operating at the same speed. However, due to the stickiness of powders, they tend to adhere to the walls of the conveying section. This adhesion prevents the powder from escaping smoothly within the conveying section, resulting in a relatively low conveying speed. As the conveying speed slows, powder gradually accumulates within the screw cavity, forming powder clumps that hinder powder transport and affect metering. Utility Model Content
[0003] The technical problem to be solved by the utility model is to solve the problem that powders accumulate in a cavity to form powder lumps.
[0004] In order to solve the above technical problems, the utility model provides a powder metering screw and a powder metering device, which include a powder metering screw: a metering section, the metering section is provided with an equidistant thread; a first conveying section, the first conveying section is provided with a variable pitch thread, the first conveying section is connected to the metering section, and any pitch of the first conveying section is greater than or equal to the pitch of the metering section; a second conveying section, the second conveying section is provided with an equidistant thread, the second conveying section is connected to the end with the larger pitch of the first conveying section, and the pitch of the second conveying section is greater than or equal to any pitch of the first conveying section, and the threads of the metering section, the first conveying section and the second conveying section are spiral and have equal radii.
[0005] Furthermore, the minimum pitch of the first conveying section is equal to the pitch of the metering section, and the maximum pitch of the first conveying section is equal to the pitch of the second conveying section.
[0006] Furthermore, the cross-sectional shapes of the metering section, the first conveying section and the second conveying section are the same.
[0007] Furthermore, the threads of the metering section, the first conveying section and the second conveying section completely cover the outer wall of the screw.
[0008] Furthermore, it further comprises a first connecting rod, which is arranged on an end of the metering section away from the first conveying section, and the first connecting rod is provided with gear teeth.
[0009] Furthermore, it further comprises a second connecting rod, which is arranged on an end of the second conveying section away from the first conveying section.
[0010] The present invention also provides a powder metering device, comprising a constant diameter cylinder and the above-mentioned powder metering screw, wherein the constant diameter cylinder is provided with a feed port and a discharge port, wherein the feed port is located above the metering section, and the discharge port is located at the end of the second conveying section.
[0011] Furthermore, the constant diameter cylinder is provided with a conveying channel, and at least two powder metering screws are arranged side by side in the conveying channel, and the powder metering screws correspond to the conveying channels one by one.
[0012] Furthermore, the thread of the powder metering screw is provided with a connecting surface, and the connecting surface abuts against the equal-diameter cylinder.
[0013] Compared with the prior art, the powder metering screw provided by the embodiment of the present invention has the following beneficial effects: by making the thread radius of the metering section, the first conveying section and the second conveying section equal, the volume per unit length of the thread of the metering section, the first conveying section and the second conveying section is equal. Since the pitch of the metering section is the smallest, when the screw rotates at the same angle, the metering section delivers the least powder and has the slowest conveying speed. Similarly, it can be seen that the first conveying section is faster than the metering section and the second conveying section has the fastest speed. Since the pitch of the metering section gradually increases from the metering section to the second conveying section, the volume of powder output per unit time is proportional to the pitch. Therefore, the conveying speed of the powder in the first conveying section will increase smoothly and gradually until it is equal to that of the second conveying section. The second conveying section then conveys the powder to the next process at a constant speed greater than that of the metering section. After the powder is metered in the metering section, it can be quickly and smoothly conveyed to the next process through the first conveying section and the second conveying section. It will not accumulate in the cavity and hinder the powder conveying, and it will avoid the formation of powder blocks that affect the metering. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a plan view of the powder metering screw provided by the utility model;
[0015] Figure 2 This is a cross-sectional view of the powder metering screw provided by the utility model;
[0016] Figure 3 It is a perspective view of the powder metering device provided by the utility model.
[0017] The corresponding relationship between the reference numerals and component names is as follows:
[0018] 1. Metering section;
[0019] 2. The first conveying section;
[0020] 3. The second conveying section;
[0021] 4. First connecting rod; 41. Gear teeth;
[0022] 5. Second connecting rod;
[0023] 6. Constant diameter cylinder; 61. Feed inlet; 62. Discharge outlet;
[0024] 7. Connecting surface. DETAILED DESCRIPTION
[0025] The following is a further detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are intended to illustrate the present invention but are not intended to limit the scope of the present invention. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, and numerical values described in these examples do not limit the scope of the present invention.
[0026] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.
[0027] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.
[0028] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.
[0029] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0030] like Figures 1 to 3 As shown, an embodiment of the first aspect of the present invention provides a powder metering screw, comprising: a metering section 1 , a first conveying section 2 and a second conveying section 3 .
[0031] Among them, the metering section 1 is provided with an equidistant thread; the first conveying section 2 is provided with a variable pitch thread, the first conveying section 2 is connected to the metering section 1, any pitch of the first conveying section 2 is greater than or equal to the pitch of the metering section 1, and the pitch of the first conveying section 2 gradually increases away from the metering section 1; the second conveying section 3 is provided with an equidistant thread, the second conveying section 3 is connected to the end with the larger pitch of the first conveying section 2, the pitch of the second conveying section 3 is greater than or equal to any pitch of the first conveying section 2, and the thread radius of the metering section 1, the first conveying section 2 and the second conveying section 3 are equal.
[0032] The powder metering screw of the present application makes the thread radius of the metering section 1, the first conveying section 2 and the second conveying section 3 equal, so that the volume per unit length of the thread of the metering section 1, the first conveying section 2 and the second conveying section 3 is equal. Since the pitch of the metering section 1 is the smallest, when the screw rotates at the same angle, the metering section 1 delivers the least powder and has the slowest conveying speed. Similarly, it can be seen that the first conveying section 2 is faster than the metering section 1, and the second conveying section 3 has the fastest speed. Since the pitch of the metering section 1 gradually increases to the second conveying section 3, the volume of powder output per unit time is proportional to the pitch. Therefore, the conveying speed of the powder in the first conveying section 2 will increase smoothly and gradually until it is equal to that at the second conveying section 3. The second conveying section 3 will constantly convey the powder to the next process at a speed greater than that of the metering section 1. After the powder is metered in the metering section 1, it can be quickly and smoothly conveyed to the next process through the first conveying section 2 and the second conveying section 3. It will not accumulate in the cavity and hinder the powder conveying, and it will avoid the formation of powder blocks that affect the metering.
[0033] By providing equidistant threads in metering section 1, accurate powder output is ensured during the metering process. The equidistant threads provide a uniform pitch, resulting in more consistent metering results per unit time, reducing production issues caused by metering errors and ensuring consistent product quality. By providing variable-pitch threads in first conveying section 2, with the pitch gradually increasing away from metering section 1, the powder's velocity transition between metering section 1 and second conveying section 3 is smooth. As the pitch gradually increases, the powder's flow velocity also increases, effectively avoiding stagnation caused by speed differences, resulting in a stable and smooth conveying process. By ensuring that the pitch of the first conveying section 2 is greater than or equal to that of the metering section 1, combined with the gradually increasing pitch of the first conveying section 2, the risk of blockage during powder conveying is effectively reduced. The variable pitch ensures ample flow space for powder during accelerated conveying, preventing obstruction caused by material accumulation. Since the pitch of the second conveying section 3 is greater than or equal to that of the first conveying section 2, powder conveying capacity is enhanced, production cycle time is shortened, and overall production efficiency is improved.
[0034] By making the thread radius of the metering section 1, the first conveying section 2, and the second conveying section 3 equal, the volume of each section is kept consistent, avoiding the accumulation of powder due to volume differences between different sections, ensuring the continuous flow of powder, and helping to maintain the efficient operation of the system. In addition, the screws with consistent radius are easy to install on the constant diameter barrel 6, and there is no need to manufacture a special type of constant diameter barrel 6 to match the screws.
[0035] Specifically, the threads of the metering section 1 , the first conveying section 2 and the second conveying section 3 are spiral.
[0036] like Figure 1As shown, in an optional embodiment of the utility model, the minimum pitch of the first conveying section 2 is equal to the pitch of the metering section 1 , and the maximum pitch of the first conveying section 2 is equal to the pitch of the second conveying section 3 .
[0037] By ensuring that the minimum pitch of the first conveying section 2 is equal to the pitch of the metering section 1, seamless material flow between the first and second conveying sections is ensured during the metering process. This reduces material retention and accumulation during conveying, thereby improving metering accuracy and avoiding metering errors caused by pitch discrepancies between the conveying and metering sections 1. By ensuring that the maximum pitch of the first conveying section 2 is equal to the pitch of the second conveying section 3, consistent material flow is achieved between the two sections, ensuring seamless material flow. When the material transitions from the first conveying section 2 to the second conveying section 3, the flow rate and flow pattern remain consistent, reducing flow resistance and material retention, and improving the smoothness of the entire conveying process. The equal pitch at the junction of the first and second conveying sections 2 and 3 ensures smooth material flow between the two sections, reducing the risk of blockage caused by material accumulation. This makes the powder metering screw suitable for fine particles or powders with poor flow properties, improving operational reliability, and enabling the powder metering screw to adapt to different types of powder materials, especially when dealing with materials with varying flow characteristics, effectively achieving stable conveying. Whether it is low-flow powder or high-flow powder, the powder metering screw can maintain good conveying performance, expanding its application range.
[0038] Improved fluidity and metering stability reduce the probability of equipment failure, thereby reducing the frequency of maintenance and downtime. This reduction in maintenance costs is reflected not only in repair expenses but also in production continuity and stability, further enhancing production efficiency. The precise metering and stable delivery of powder metering screws ensures the quality of the final product. In many industrial fields, powder metering and delivery directly affect product formulation and quality. Maintaining consistent material flow effectively controls product composition and enhances product market competitiveness.
[0039] like Figure 1 and Figure 2 As shown, in an optional embodiment of the utility model, the cross-sectional shapes of the metering section 1, the first conveying section 2 and the second conveying section 3 are the same.
[0040] By ensuring that the metering section 1, first conveying section 2, and second conveying section 3 have the same cross-sectional shape and outer diameter, the material flows uniformly throughout the first conveying section 2 and metering section 1, avoiding variations in material flow rate due to inconsistent cross-sectional shapes. Furthermore, by ensuring that the screws in the metering section 1, first conveying section 2, and second conveying section 3 have the same volume per unit length, metering section 1 delivers the least powder and has the slowest conveying speed, due to the smallest pitch in metering section 1. Consequently, the first conveying section 2 is faster than metering section 1, while the second conveying section 3 is the fastest. This uniform cross-sectional shape simplifies manufacturing and reduces production costs. Furthermore, the identical structure of each section during maintenance further reduces maintenance complexity and costs, improving the maintainability of the equipment. The consistent cross-sectional shape of the metering section 1 and conveying section ensures stable material flow during the metering process, enhances metering accuracy, and ensures consistent product quality and formulation. This significantly reduces losses caused by metering errors in precision-critical industries. Using the same cross-sectional shape can achieve standardization of molds and equipment in the production process, shorten the production cycle, reduce the complexity of the equipment manufacturing process, and improve production efficiency.
[0041] like Figure 1 As shown, in an optional embodiment of the utility model, the threads of the metering section 1, first conveying section 2, and second conveying section 3 completely cover the outer wall of the screw. This fully covered screw maximizes the contact area between the screw and the material, ensuring efficient material propulsion during conveying, significantly improving material conveying efficiency, reducing material retention within the screw, and ensuring a consistent and consistent material delivery. Complete coverage of the screw's outer wall effectively promotes material mixing during conveying and metering, particularly when multiple powders are required. This ensures thorough mixing of the different components during conveying, ensuring uniformity and consistency in the final product. Fully covered threads maintain a stable material flow within the screw, preventing stratification or separation due to gravity or friction, resulting in more uniform material flow and improved metering accuracy and repeatability. By completely covering the outer wall, the material flow within the metering section 1 is more stable, reducing metering errors and improving the consistency and quality of the final product. This fully covered thread structure effectively guides the smooth flow of material, reduces the risk of equipment downtime due to material blockage, and ensures the continuity and stability of the production process.
[0042] like Figure 1As shown, in an optional embodiment of the utility model, the length of the first conveying section 2 is shorter than the length of the metering section 1. By making the first conveying section 2 shorter than the metering section 1, the material can be fully metered and stably transported before entering the first conveying section 2. The longer metering section 1 can more accurately control the material delivery rate, improving the overall metering accuracy. The short first conveying section 2 helps to quickly transfer the material to the second conveying section 3, reducing the material's residence time during the conveying process. This avoids the loss of fluidity or agglomeration caused by the material's prolonged residence in the first conveying section 2, ensuring that the material maintains optimal flow upon entering the second conveying section 3.
[0043] like Figure 1 As shown, in an optional embodiment of the utility model, the length of the first conveying section 2 is shorter than that of the second conveying section 3. This shortening of the first conveying section 2 helps to increase conveying speed more quickly in the initial stages of material conveying, allowing the material to be quickly directed to the second conveying section 3, thereby maintaining continuous material flow and reducing stagnation and stratification during conveying. With a shorter first conveying section 2, the material can enter the second conveying section 3 more quickly. Since the second conveying section 3 has the fastest conveying speed, this promotes rapid material transportation throughout the entire conveying process.
[0044] like Figure 1 and Figure 3 As shown, in an optional embodiment of the utility model, a first connecting rod 4 is further included. The connecting rod is arranged on an end of the metering section 1 away from the first conveying section 2 , and the first connecting rod 4 is provided with gear teeth 41 .
[0045] By providing the first connecting rod 4 with gear teeth 41, the movement of the metering section 1 and the material conveying speed can be precisely controlled, the accuracy of material metering can be improved, the amount of material conveyed each time can be ensured to be consistent, and deviations caused by human or mechanical errors can be reduced. The gear tooth 41 structure can effectively transmit power, making the connecting rod more flexible during operation. Through this power transmission method, the energy utilization rate of the system is improved, energy loss is reduced, and the overall working efficiency of the equipment is improved. Because the gear tooth 41 structure can provide smooth operation, the friction between the material and the equipment is reduced, thereby reducing the wear rate of the equipment. Through effective power transmission and flow control, the connecting rod can reduce the risk of failure that may occur during operation, improve the safety of operation, and reduce production interruptions caused by equipment failure, ensuring the continuity and stability of the production line.
[0046] like Figure 1 and Figure 3As shown, in an optional embodiment of the utility model, a second connecting rod 5 is further included, which is arranged on the end of the second conveying section 3 away from the first conveying section 2. By arranging the second connecting rod 5 in the second conveying section 3, it is convenient to rotate the powder metering screw and connect it to the equal-diameter cylinder 6, which can improve the overall stability of the system, reduce the vibration and fluctuation of the material during the conveying process, help maintain the uniformity of the material, ensure the accuracy and consistency of each measurement, and thus improve product quality. The second connecting rod 5 can make it easy to remove the screw for maintenance and cleaning. By reducing the accumulation of material in the screw, operators can perform daily maintenance and cleaning more easily, extending the service life of the screw.
[0047] like Figure 1 As shown, an embodiment of the third aspect of the present application provides a powder metering device, including a constant diameter cylinder and the aforementioned powder metering screw, the constant diameter cylinder is provided with a feed port 61 and a discharge port 62, the feed port 61 is located above the metering section 1, and the discharge port 62 is located at the end of the second conveying section 3.
[0048] During actual use, the powder metering screw is embedded in a cylinder of equal diameter, and a cavity of fixed volume is formed between the powder metering screw and the cylinder of equal diameter. When the screw runs at the same speed, the volume of powder passing through its metering section 1 per unit time is equal, ensuring consistent metering effect. The operation of the powder metering screw depends on the shape and structure of the cylinder in which it is embedded. The cylinder is a cylinder of equal diameter, and its inner diameter remains consistent throughout its length, which can effectively control the flow and compaction of the powder, thereby improving the material conveying efficiency. The powder metering screw can be designed as a single-axis or multi-axis form as needed. Single-axis metering screws are usually used for simple material conveying, while multi-axis metering screws can provide higher conveying capacity and more complex material handling capabilities, and are suitable for the mixing and metering needs of various materials.
[0049] like Figure 3 As shown, in an optional embodiment of the utility model, the equal-diameter cylinder is provided with a conveying channel, and at least two powder metering screws are arranged side by side in the conveying channel, and the powder metering screws correspond to the conveying channels one by one.
[0050] By arranging multiple powder metering screws in parallel within the same conveying channel, it is possible to ensure that each screw evenly conveys the corresponding powder, thereby achieving higher metering accuracy and consistency and reducing metering errors caused by single screw failure. Multiple powder metering screws arranged in parallel can significantly improve the overall conveying capacity, making the equipment more efficient when handling large flow rates of materials, adapting to higher production needs, and meeting the rapid development of industrial production. By adjusting the number and configuration of parallel screws according to specific needs, the flexibility and adaptability of the equipment are enhanced, making it easy to respond to the characteristics of different powder materials and production process requirements. Due to the parallel design of multiple screws, even if one of the screws fails, the other screws can continue to work, reducing the risk of overall equipment downtime, thereby reducing maintenance and production costs.
[0051] like Figure 3 As shown, in an optional embodiment of the utility model, the threads of the powder metering screw are provided with a connecting surface 7, which abuts against the constant diameter cylinder 6. By providing the connecting surface 7 on the threads of the powder metering screw to abut against the constant diameter cylinder 6, the contact area between the powder metering screw and the constant diameter cylinder 6 is increased, making the rotation of the powder metering screw more stable and improving the stability of powder transportation.
[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.
Claims
1. A powder metering screw, characterized in that: include: a metering section, wherein the metering section is provided with equidistant threads; a first conveying section, wherein the first conveying section is provided with a variable pitch thread, the first conveying section is connected to the metering section, and any pitch of the first conveying section is greater than or equal to the pitch of the metering section; The second conveying section is provided with an equidistant thread, the second conveying section is connected to the end with the larger pitch of the first conveying section, the pitch of the second conveying section is greater than or equal to any pitch of the first conveying section, and the threads of the metering section, the first conveying section and the second conveying section are spiral and have equal radii.
2. The powder metering screw according to claim 1, characterized in that: The minimum pitch of the first conveying section is equal to the pitch of the metering section, and the maximum pitch of the first conveying section is equal to the pitch of the second conveying section.
3. The powder metering screw according to claim 1, characterized in that: The metering section, the first conveying section, and the second conveying section have the same cross-sectional shape.
4. The powder metering screw according to claim 1, characterized in that: The threads of the metering section, the first conveying section and the second conveying section completely cover the outer wall of the screw.
5. The powder metering screw according to claim 1, characterized in that: It also includes a first connecting rod, which is arranged on an end of the metering section away from the first conveying section, and the first connecting rod is provided with gear teeth.
6. The powder metering screw according to claim 1, characterized in that: It also includes a second connecting rod, which is arranged on an end of the second conveying section away from the first conveying section.
7. A powder measuring device, characterized in that: It comprises a constant diameter cylinder and the powder metering screw according to any one of claims 1 to 6, wherein the constant diameter cylinder is provided with a feed port and a discharge port, wherein the feed port is located above the metering section, and the discharge port is located at the end of the second conveying section.
8. The powder measuring device according to claim 7, characterized in that: The constant diameter cylinder is provided with a conveying channel, and at least two powder metering screws are arranged in parallel in the conveying channel, and the powder metering screws correspond to the conveying channels one by one.
9. The powder measuring device according to claim 8, characterized in that: The thread of the powder metering screw is provided with a connecting surface, and the connecting surface abuts against the equal-diameter cylinder.