A powder flow tester

Abstract

The utility model discloses a kind of powder flowability testers, belong to powder detection technical field, including support and the measuring piece of being installed on support, the support includes bottom plate, horizontal adjusting assembly is installed in bottom plate lower end, fixed mounting column is installed in bottom plate upper end, top plate is installed in column upper end, top plate is opened feed inlet, hopper is detachably installed in feed inlet, the object placing table for receiving material is installed in bottom plate upper end;The measuring piece includes the load-bearing assembly of being slidably installed on column, baffle is rotatably installed on load-bearing assembly, and scale is marked on column. The effect of sealing the discharge port of hopper is realized by setting baffle, in addition, the height of material pile is obtained in the process of measurement, so as to calculate the degree of repose angle, compared with the existing measurement mode through protractor, the disturbance to material pile is small, so measurement result is more accurate.

Description

Technical Field

[0001] This utility model relates to the field of powder testing technology, specifically to a powder flowability tester. Background Technology

[0002] Powder flowability refers to the ability of powder particles to move relative to each other under the influence of gravity or external force. Its quality is affected by factors such as particle size, particle shape, surface roughness, bulk density, and humidity. Generally, powders with larger particle size, regular shape, and smooth surface have better flowability, while small, irregular, or highly hygroscopic particles are prone to agglomeration, which leads to flow obstruction. Hall flowmeters are commonly used to evaluate this by measuring the amount of powder flowing out of a standard funnel per unit time. Good flowability is one of the key process properties for ensuring uniformity and production stability in pharmaceutical tableting, powder metallurgy molding, and additive manufacturing powder spreading.

[0003] Existing technology discloses a rapid measuring device for the angle of repose of sand grains, including a main platform, receiving tray, main rod, adjusting component, crossbar, ring, funnel, accumulation tray, telescopic rod, collar, L-connecting shaft, protractor, push rod, L-fixed shaft, scale, stop block, fixed angle vernier, scale groove, sieve frame, support block, and sieve screen. The protractor used in this device has no bottom blank, and the center of the protractor is aligned with the center of the telescopic rod. The protractor is connected to the non-center part of the protractor via the L-connecting shaft, which can quickly measure the angle of repose without damaging the structure of the sand accumulation. A sieve screen is provided at the top to screen out the sand grains to be measured. This device can quickly and accurately measure the angle of repose without damaging the structure of the accumulation to be measured, and can also screen out the sand grains with the desired angle of repose to be measured.

[0004] The aforementioned device measures the angle of repose of the material by keeping the bottom edge of the protractor parallel to the hypotenuse of the material pile. During operation, in order to achieve measurement accuracy, it is necessary to control the bottom edge of the protractor to keep it in contact with the hypotenuse of the material pile without generating pressure that could damage the pile. However, manually controlling the rotation of the protractor is difficult to achieve this objective.

[0005] Based on this, the present invention designs a powder flowability tester to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a powder flowability tester.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A powder flowability tester includes a support and a measuring component mounted on the support. The support includes a base plate, a horizontal adjustment component is mounted on the lower end of the base plate, a column is fixedly mounted on the upper end of the base plate, a top plate is mounted on the upper end of the column, a feed inlet is opened on the top plate, a funnel is detachably installed in the feed inlet, and a platform for receiving materials is mounted on the upper end of the base plate. The measuring component includes a bearing assembly that is slidably mounted on a column, a baffle plate that is rotatably mounted on the bearing assembly, and a scale marked on the column; The baffle is located at the lower end of the funnel and fits against the discharge port at the lower end of the funnel. The baffle moves up and down with the supporting component.

[0008] Preferably, the bearing assembly includes a slide cylinder that moves up and down along the column, and the baffle is rotatably mounted on the periphery of the slide cylinder.

[0009] Preferably, the leveling assembly includes a support leg and a tip threaded to the lower end of the support leg, and a level bubble is installed on the upper end of the base plate.

[0010] Preferably, the feed inlet on the top plate has a support platform, and the funnel is located at the upper end of the support platform.

[0011] Preferably, a rotating cylinder is rotatably mounted around the sliding cylinder, and the baffle is fixedly mounted on the outer wall of the rotating cylinder.

[0012] Preferably, a bearing is installed between the slide and the rotating cylinder, with the inner wall of the bearing fixedly connected to the slide and the outer wall of the bearing fixedly connected to the rotating cylinder.

[0013] Preferably, the outer wall of the slide is threaded with a fixing bolt, which fixes the slide to the column.

[0014] Preferably, a threaded hole is provided at the lower end of the support leg, and a threaded rod that matches the threaded hole is fixedly installed at the upper end of the tip, with the threaded rod being threadedly connected to the threaded hole.

[0015] Compared with the prior art, the advantages of this utility model are as follows: 1. By setting a baffle, the outlet of the funnel is sealed. In addition, the height of the material pile is obtained during the measurement process, and the degree of the angle of repose is calculated. Compared with the existing method of measuring with a protractor, this method causes less disturbance to the material pile, so the measurement result is more accurate. 2. By adjusting the tips of the lower ends of the support legs at different positions, the base plate can be kept level when the device is placed on a platform that is not level enough. The levelness can be judged by the centering of the air in the level bubble, thus keeping the upper platform of the base plate level as well, and ultimately ensuring the test results. 3. The funnel and the support platform are detachably connected, making it easy to remove the funnel from the device after use for cleaning and maintenance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a powder flowability tester according to the present invention; Figure 2 This is an exploded view of a powder flowability tester according to the present invention; Figure 3 This is a cross-sectional view of a powder flowability tester according to the present invention; Figure 4 for Figure 1 Enlarged view of section A.

[0018] The labels in the diagram represent: 10. Support; 11. Base plate; 111. Support leg; 112. Tip; 113. Level bubble; 12. Column; 13. Top plate; 131. Feed inlet; 132. Support platform; 133. Funnel; 134. Discharge outlet; 14. Load-bearing column; 141. Placement platform; 20. Measuring piece; 21. Slide cylinder; 22. Rotary cylinder; 221. Bearing; 23. Fixing bolt; 24. Baffle plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] Powder flowability refers to the ease and ability of a powder to flow under the influence of gravity, external force, or gas. It is a comprehensive macroscopic manifestation, not a single physical property, and is influenced by various powder properties and external conditions. In practical work, the degree of flowability can be reflected by measuring the angle of repose or angle of rest of the powder. The smaller the angle of repose, the better the flowability. The instrument for measuring the angle of repose is an angle of repose measuring instrument. After the powder falls from the top of the device, it forms a conical pile. The angle between the hypotenuse of the pile and the water surface is the angle of repose. The inventor discovered that existing angle of repose measurements generally use a protractor to contact the inclined surface of the pile. When in contact, the bottom edge of the protractor presses on the pile, and the pile itself is in a critical state of stress. Even a slight lateral pressure can cause further collapse. At the same time, when the two are in contact, the protractor is pressed into the pile, which also increases the measurement error.

[0021] In some embodiments, please refer to the accompanying drawings. Figure 1 A powder flowability tester includes a support 10 and a measuring element 20 mounted on the support 10. The support 10 is the main frame of the device and is used to support the measuring element 20 and powder materials, etc. The main function of the measuring element 20 is to measure the height of the pile formed when the powder flows downward naturally.

[0022] Specifically, such as Figure 1 As shown, the support 10 includes a disc-shaped base plate 11. Three legs 111 are evenly distributed at the lower end of the base plate 11. The upper ends of the legs 111 are fixedly connected to the base plate 11. Three columns 12 are also vertically welded and fixed at the upper end of the base plate 11. A disc-shaped top plate 13 is fixedly connected to the upper end of the columns 12. A through hole is opened in the middle of the top plate 13. An annular feed inlet 131 is fixed at the edge of the upper through hole. An inverted conical funnel 133 is fixedly installed inside the feed inlet 131. The funnel 133 is open at both ends. The upper end is an opening for pouring in powder, and the lower end is a discharge outlet 134 for powder to flow out.

[0023] On the other hand, a load-bearing column 14 is vertically fixed at the center of the upper end of the base plate 11. A disc-shaped platform 141 is fixed at the upper end of the load-bearing column 14. The center of the platform 141 is on the same vertical axis as the circle of the base plate 11. At the same time, the center of the platform 141 is directly opposite the discharge port 134 of the funnel 133 located at its upper end. After the powder flows down from the discharge port 134, it falls onto the platform 141 and gradually forms a conical pile.

[0024] Measuring component 20 includes a slide 21, such as Figure 1 , Figure 4As shown, the slide cylinder 21 is a cylindrical structure that fits onto the column 12, which is marked with graduations. The inner diameter of the slide cylinder 21 is slightly larger than the outer diameter of the column 12, and the two are in a clearance fit. Therefore, the slide cylinder 21 can rotate around the column 12 or move vertically up and down along the long axis of the column 12. To constrain this movement, a threaded hole is made on the lower half of the outer wall of the slide cylinder 21, and a fixing bolt 23 is threaded into the hole. Figure 4 As shown, a rotating cylinder 22 is fitted around the upper part of the sliding cylinder 21. A bearing 221 is installed between the sliding cylinder 21 and the rotating cylinder 22. The inner wall of the bearing 221 is fixedly connected to the sliding cylinder 21, and the outer wall of the bearing 221 is fixedly connected to the rotating cylinder 22. In this way, the rotating cylinder 22 can rotate around the sliding cylinder 21. Figure 1 As shown, one end of the baffle plate 24 is fixedly connected to the outer wall of the vertical rotating cylinder 22, and the other end is a free end that extends outward for a certain length. When the free end is located at the lower end of the discharge port 134 of the funnel 133, the baffle plate 24 can block the discharge port 134.

[0025] In use, the powder to be tested is first poured into the funnel 133 through the inlet 131. The sliding cylinder 21 drives the baffle 24 to block the outlet 134 at the lower end of the funnel 133. After the powder is completely poured into the funnel 133, the baffle 24 is rotated in the horizontal plane, and the powder flows out from the outlet 134 to the upper end of the platform 141. As the powder accumulates on the platform 141, it forms a cone-shaped pile, such as... Figure 3 As shown, after all the powder has flowed out of the funnel 133, the slide cylinder 21 and the baffle 24 are moved downwards. The baffle 24 moves down to the top of the material pile, and the scale on the column 12 where the slide cylinder 21 is located is recorded at this time (when the lower end of the baffle 24 is attached to the upper surface of the platform 141, the lower end of the slide cylinder 21 is at the lowest point of the scale). In this way, the height of the material pile can be measured. The radius of the platform 141 is known data. Therefore, the degree of ∠A can be calculated according to the inverse trigonometric function.

[0026] By setting baffle 24, the discharge port 134 of funnel 133 is sealed. In addition, the height of the material pile is obtained during the measurement process, and the degree of the angle of repose is calculated. Compared with the existing method of measuring with a protractor, this method causes less disturbance to the material pile, so the measurement result is more accurate.

[0027] In some embodiments, such as Figure 2 As shown, in a preferred embodiment of the present invention, a threaded hole is opened at the lower end of the support leg 111, and a threaded rod is threadedly installed in the threaded hole. The lower end of the threaded rod is fixedly connected to a tip 112, which is an inverted cone shape with the tip pointing downwards. The threaded rod has a certain length, and the depth of the threaded rod in the threaded hole can be adjusted by rotating the tip 112, thereby adjusting the distance between the tip 112 and the support leg 111.

[0028] By adjusting the tips 112 at the lower ends of the support legs 111 in different positions, the base plate 11 can be kept level when the device is placed on a platform that is not level enough. The levelness can be determined by the centering of the air in the level bubble 113, thereby keeping the platform 141 at the upper end of the base plate 11 level as well, and ultimately ensuring the test results.

[0029] In some embodiments, such as Figure 2 As shown, in a preferred embodiment of the present invention, a horizontal support platform 132 extends inward from the through hole of the top plate 13. The support platform 132 is used to support the funnel 133 at its upper end. The upper edge of the funnel 133 has an outwardly extending flange. The shape and size of the flange are the same as those of the support platform 132. Therefore, the funnel 133 can be supported on the support platform 132, and the two are detachably connected.

[0030] The detachable connection between the funnel 133 and the support 132 makes it easy to remove the funnel 133 from the device after use for cleaning and maintenance.

[0031] Working principle: First, the powder to be tested is poured into the funnel 133 through the feed inlet 131. The sliding cylinder 21 drives the baffle 24 to block the discharge port 134 at the lower end of the funnel 133. After the powder is completely poured into the funnel 133, the baffle 24 is rotated in the horizontal plane, and the powder flows out from the discharge port 134 to the upper end of the platform 141. As the powder continuously accumulates on the platform 141, it forms a cone-shaped pile, such as... Figure 3 As shown, after all the powder has flowed out of the funnel 133, the slide cylinder 21 and the baffle 24 are moved downwards. The baffle 24 moves down to the top of the material pile, and the scale on the column 12 where the slide cylinder 21 is located is recorded at this time (when the lower end of the baffle 24 is attached to the upper surface of the platform 141, the lower end of the slide cylinder 21 is at the lowest point of the scale). In this way, the height of the material pile can be measured. The radius of the platform 141 is known data. Therefore, the degree of ∠A can be calculated according to the inverse trigonometric function.

[0032] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A powder flowability tester, comprising a support (10) and a measuring element (20) mounted on the support (10), characterized in that: The support (10) includes a base plate (11), a horizontal adjustment component is installed at the lower end of the base plate (11), a column (12) is fixedly installed at the upper end of the base plate (11), a top plate (13) is installed at the upper end of the column (12), a feed inlet (131) is opened on the top plate (13), a funnel (133) is detachably installed in the feed inlet (131), and a platform (141) for receiving materials is installed at the upper end of the base plate (11). The measuring component (20) includes a bearing assembly that is slidably mounted on a column (12), a baffle (24) that is rotatably mounted on the bearing assembly, and a scale marked on the column (12); The baffle (24) is located at the lower end of the funnel (133) and fits against the discharge port (134) at the lower end of the funnel (133). The baffle (24) moves up and down with the bearing assembly.

2. The powder flowability tester according to claim 1, characterized in that, The supporting component includes a slide cylinder (21), which moves up and down along the column (12), and the baffle (24) is rotatably installed around the slide cylinder (21).

3. The powder flowability tester according to claim 2, characterized in that, The leveling assembly includes a support leg (111) and a tip (112) threaded to the lower end of the support leg (111), and a level bubble (113) is installed on the upper end of the base plate (11).

4. The powder flowability tester according to claim 3, characterized in that, The top plate (13) has a support platform (132) at the feed inlet (131), and the funnel (133) is located at the upper end of the support platform (132).

5. The powder flowability tester according to claim 4, characterized in that, A rotating cylinder (22) is rotatably installed around the sliding cylinder (21), and the baffle (24) is fixedly installed on the outer wall of the rotating cylinder (22).

6. The powder flowability tester according to claim 5, characterized in that, A bearing (221) is installed between the slide (21) and the rotating cylinder (22). The inner wall of the bearing (221) is fixedly connected to the slide (21), and the outer wall of the bearing (221) is fixedly connected to the rotating cylinder (22).

7. The powder flowability tester according to claim 6, characterized in that, The outer wall of the slide (21) is threaded with a fixing bolt (23), which fixes the slide (21) to the column (12).

8. The powder flowability tester according to claim 3 or 7, characterized in that, The lower end of the support leg (111) has a threaded hole, and the upper end of the tip (112) is fixedly installed with a threaded rod that matches the threaded hole, and the threaded rod is threadedly connected to the threaded hole.

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