Device for rapidly measuring and comparing flowability of powder
By designing a powder flowability measuring device with a vibration device and a rotatable tube wall, the problem of inconsistent initial velocity in powder flowability measurement was solved, achieving high accuracy and simple flowability measurement, applicable to various powders.
Patent Information
- Application Number
- CN202423161361.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Existing powder flowability testing devices cannot guarantee consistent initial velocity, resulting in low accuracy of test results, especially for powders with poor flowability, where the results have poor repeatability and large errors.
A measuring device with a vibration device and a rotatable tube wall was designed. The powder falls naturally under gravity to ensure a consistent initial velocity. The device is automated through scale lines and a controller, simplifying the operation process.
It improves the accuracy and repeatability of powder flowability testing, simplifies the operation process, reduces testing errors, and is suitable for powders with poor flowability.
Smart Images
Figure CN223883399U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to powder flowability measurement technical equipment field, and specifically relates to a device for rapidly determining and comparing powder flowability. BACKGROUND
[0002] The flowability of powder is related to the shape, size, surface state, density and porosity of particles, and the complex relationship between the internal friction and adhesion between particles, and thus cannot be expressed by a single value. The flowability of powder is usually indicated by the repose angle and flow rate. The repose angle refers to the maximum angle between the free surface of a pile of powder accumulated on a horizontal plane and the horizontal plane, that is, the angle between the inclined side of the pile of powder accumulated into a cone shape as steep as possible and the horizontal line, which is usually indicated by alpha. The repose angle is the simplest method for testing the flowability of powder. The better the flowability of powder, the smaller the repose angle; the rougher the surface of powder particles and the greater the adhesion, the greater the repose angle. Generally, the flowability is good when the repose angle is less than or equal to 30 degrees, the flowability can meet the needs of the production process when the repose angle is less than or equal to 40 degrees, and the flowability is poor when the repose angle is greater than or equal to 40 degrees.
[0003] The flow rate refers to the speed of powder flowing out of a hole or a pipe with a certain aperture per unit time. The specific determination method is to open a hole in the center of the bottom of a cylindrical container, fill the container with powder, and determine the amount of powder flowing out per unit time, that is, the flow rate. Generally, the flow rate of powder is fast, and the flowability is good, and the uniformity of flow is also good. However, in the conventional powder flow rate determination device, the initial speed cannot be guaranteed to be consistent every time, resulting in low accuracy of the determination result.
[0004] When comparing the flowability of various powders, if the flowability of the powder is poor, the powder cannot be normally discharged from the bottom center hole when the powder is filled into the powder flow tester. In addition, for the flow rate method, since the initial speed is not zero, the results obtained for the weakly flowable powder with high viscosity are not reproducible, and the error is large. Therefore, to compare the flowability of similar powders, the powder flowability tester using the center hole flow rate method cannot obtain accurate results. UTILITY MODEL CONTENTS
[0005] The utility model aims at overcoming the defects of the prior art, and provides a device for rapidly determining and comparing powder flowability.
[0006] In order to achieve the above object, the utility model provides the following technical scheme: a kind of device for rapidly determining contrast powder fluidity, it is characterized by: table top is fixed on support, vibration device is equipped below table top, scale line is engraved on the surface of table top, and scale line is composed of multiple concentric circles, table top surface is equipped with sample tube, and sample tube is composed of tube wall and bottom disc;The recess is set in the center of table top, bearing is embedded in recess and is fixed with it;Sample tube center is equipped with connecting shaft, connecting shaft passes through disc and is sealed and fixed with disc, and connecting shaft bottom end penetrates table top;Fixed ring is fixed with the bottom end of table top by the connecting piece of both sides, and fixed ring is concentric with connecting shaft and has a certain gap with table top;Fixed ring is equipped with controller for controlling the start of vibration device;
[0007] The tube wall is composed of four curved surfaces, the first curved surface and the second curved surface are oppositely arranged and fixed on the surface of the table top, the third curved surface and the fourth curved surface are oppositely arranged and fixed on the edge of the disc, and the radius of the third curved surface and the fourth curved surface is slightly smaller than the radius of the first curved surface and the second curved surface;When the connecting shaft rotates, the disc and the third curved surface and the fourth curved surface rotate together.
[0008] The connecting shaft is higher than the tube wall, and the cross knob for rotation is arranged at the top end of the connecting shaft;When the cross knob is rotated clockwise, the third curved surface and the fourth curved surface on the disc are rotated by the connecting shaft, the inner surface of the third curved surface and the second curved surface is attached, and the inner surface of the fourth curved surface and the first curved surface is attached.
[0009] The controller includes a slip ring, a first metal block and a second metal block for limiting;The first metal block and the second metal block are arranged on the fixed ring, and the two tangent lines with the first metal block and the second metal block as tangent points are perpendicular to each other;The slip ring is arranged on the fixed ring, and the slip ring is located between the first metal block and the second metal block, the slip ring is connected with the center of the bottom end of the connecting shaft through the connecting rod, and the connecting shaft rotates to rotate the third curved surface and the fourth curved surface by 0°-90°;The control switch of the vibration device is connected with the contact piece through the wire, the contact piece has a certain gap with the first metal block, the gap size is slightly smaller than the diameter of the slip ring, so that the slip ring can contact with the contact piece while contacting with the first metal block, and the first metal block is connected with the vibration device through the loop wire.
[0010] The center of the disc is coincident with the center of the scale line.
[0011] The lower segment of the connecting shaft located below the table top is thicker than the upper segment located above the table top;The diameter of the recess opened in the center of the table top is the same as the outer diameter of the bearing;A through hole is opened below the recess, and the inner diameter of the through hole is slightly larger than the outer diameter of the lower segment of the connecting shaft.
[0012] The first curved surface and the second curved surface are marked with tube wall scale line.
[0013] The support is equipped with the power switch of the vibration device.
[0014] The utility model discloses a beneficial effect is: the pipe of rotatable pipe wall is designed, and the device falls naturally by gravity action, makes initial speed consistent and most close to zero, guarantees the stable repeatability, and the accuracy of powder fluidity determination is greatly improved, because the device rotates and opens the instant and can realize a large amount of powder falling, and the result of some powder of poor fluidity can also be determined quickly, the device is simple and easy to operate, and the manufacturing cost is lower, the sample tube and the mesa are all equipped with the scale in the device, and the height and radius of powder heap after falling are not needed to use the scale of extra, and the measurement error is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is the utility model schematic diagram;
[0016] Figure 2 It is the utility model sample tube structure schematic diagram;
[0017] Figure 3 It is the utility model connecting axle and mesa connection structure diagram;
[0018] Figure 4 It is the utility model controller connection schematic diagram;
[0019] Figure 5 It is the utility model use state schematic diagram;
[0020] In the drawing: 1-connecting axle, 2-sample tube, 21-pipe wall, 22-round piece, 3-scale line, 4-mesa, 5-bracket, 6-switch, 7-cross knob, 8-bearing, 9-connecting piece, 10-fixing ring, 11-sliding ring, 12-connecting rod, 13-first metal block, 14-second metal block, 15-contact sheet, 16-vibration device. DETAILED DESCRIPTION
[0021] See Figures 1-4 A device for quickly determining the fluidity of contrast powder, characterized in that: the mesa 4 is fixed on the bracket 5, the vibration device 16 is arranged below the mesa 4, the scale line 3 composed of a plurality of concentric circles is marked on the surface of the mesa 4, the sample tube 2 is arranged on the surface of the mesa 4, the sample tube 2 is composed of the pipe wall 21 and the round piece 22 at the bottom; the recess is arranged in the center of the mesa 4, and the bearing 8 is embedded in the recess and fixed therewith; the connecting axle 1 is arranged in the center of the sample tube 2, the connecting axle 1 penetrates through the round piece 22 and is sealingly fixed with the round piece 22, and the bottom end of the connecting axle 1 penetrates out of the mesa 4; the fixing ring 10 is fixed with the bottom end of the mesa 4 through the connecting pieces 9 on both sides, the fixing ring 10 is concentric with the connecting axle 1 and has a certain gap with the mesa 4; the controller for starting the vibration device 16 is arranged on the fixing ring 10;
[0022] The pipe wall 21 is composed of four curved surfaces, the first curved surface 21A and the second curved surface 21C are oppositely arranged and fixed on the surface of the table top 4, the third curved surface 21B and the fourth curved surface 21D are oppositely arranged and fixed on the edge of the circular plate 22, the radius of the third curved surface 21B and the fourth curved surface 21D is slightly smaller than the radius of the first curved surface 21A and the second curved surface 21C; when the connecting shaft 1 rotates, it drives the circular plate 22 and the third curved surface 21B and the fourth curved surface 21D to rotate.
[0023] The connecting shaft 1 is higher than the pipe wall 21, and the top end of the connecting shaft 1 is provided with a cross knob 7 for rotation; rotating the cross knob 7 clockwise, the connecting shaft 1 drives the third curved surface 21B and the fourth curved surface 21D on the circular plate 22 to rotate, the inner surface of the third curved surface 21B and the second curved surface 21C are in contact, and the inner surface of the fourth curved surface 21D and the first curved surface 21A are in contact.
[0024] The controller includes a slip ring 11, a first metal block 13 and a second metal block 14 for limiting; the first metal block 13 and the second metal block 14 are arranged on the fixed ring 10, and two tangent lines with the first metal block 13 and the second metal block 14 as tangent points are perpendicular to each other; the fixed ring 10 is provided with a slip ring 11, the slip ring 11 is located between the first metal block 13 and the second metal block 14, the slip ring 11 is connected with the bottom center of the connecting shaft 1 through a connecting rod 12, the connecting shaft 1 drives the third curved surface 21B and the fourth curved surface 21D to rotate 0°-90°; the control switch of the vibration device 16 is connected with the contact piece 15 through the wire, the contact piece 15 has a certain gap with the first metal block 13, the gap size is slightly smaller than the diameter of the slip ring 11, so that the slip ring 11 can contact the contact piece 15 while contacting the first metal block 13, and the first metal block 13 is connected with the vibration device 16 through the loop wire.
[0025] The center of the circular plate 22 is coincident with the center of the scale line 3.
[0026] The lower part of the connecting shaft 1 located below the table top 4 is thicker than the upper part located above the table top 4; the diameter of the groove opened in the center of the table top 4 is the same as the outer diameter of the bearing 8; a through hole is opened below the groove, and the inner diameter of the through hole is slightly larger than the outer diameter of the lower part of the connecting shaft 1.
[0027] The first curved surface 21A and the second curved surface 21C are marked with pipe wall scale lines.
[0028] The bracket 5 is provided with the power switch 6 of the vibration device 16.
[0029] The use method is: (the height of the sample tube is 300mm, and the diameter is 30mm), see Figure 5 .
[0030] First, the sample is put into the sample tube 2, and the tube wall 21 is closed. At this time, the sliding ring 11 is at the position of the second metal block 14.
[0031] Second, the switch 6 of the vibration device 16 is turned on, and the connecting shaft 1 is rotated clockwise quickly by holding the cross knob 7. The connecting rod 12 and the sliding ring 11 are rotated together. When the sliding ring 11 slides from the second metal block 14 to the first metal block 13, the rotation angle is 90 degrees. At the same time, the contact piece 15 is touched, forming a closed loop, i.e. the vibration device 16 starts to work.
[0032] Third, while the connecting shaft 1 is rotating, the third curved surface 21B and the fourth curved surface 21D on the disc 22 are rotated by the connecting shaft 1 until the third curved surface 21B is attached to the inner surface of the second curved surface 21C, and the fourth curved surface 21D is attached to the inner surface of the first curved surface 21A. At this time, the sample tube 2 becomes an open body, and the sample powder falls naturally from the gap between the two sides of the tube body and scatters on the circular scale line 3 on the table 4 (it should be noted that the vibration time is set in advance, generally 0.3 seconds, and the vibration device 16 is automatically stopped after the vibration time is reached, and the switch 6 is manually operated to turn off the vibration device 16).
[0033] Fourth, when the sample powder falls and flows completely still, the highest height value of the remaining powder in the sample tube 2 is read out and recorded as H; the farthest radius distance of the powder flow on the circular scale line 3 is read out and recorded as L.
[0034] Fifth, the rest angle α is calculated, α = arctan (H / L).
[0035] According to the above steps, the flowability of each powder with approximate flowability is determined. According to the analysis of the rest angle α, the larger the rest angle α, the worse the flowability; the smaller the rest angle α, the better the flowability.
[0036] Note: When judging the flow performance of a single powder sample, the sample amount in the sample tube 2 and the vibration time can be set as required; when comparing the flowability differences of different powder samples, the sample amount and the vibration time are set the same to avoid misleading the test results due to different initial parameters.
Claims
1. A device for rapid determination of the flowability of contrast powders, characterized in that it comprises: The table top (4) is fixed on the support (5), and a vibration device (16) is arranged below the table top (4). A scale line (3) composed of a plurality of concentric circles is engraved on the surface of the table top (4). The table top (4) is provided with a sample tube (2) composed of a tube wall (21) and a disc (22) at the bottom. A groove is formed in the center of the table top (4), and a bearing (8) is embedded in the groove and fixed thereto. The sample tube (2) is provided with a connecting shaft (1) in the center, the connecting shaft (1) penetrates through the disc (22) and is fixed to the disc (22), and the bottom end of the connecting shaft (1) penetrates out of the table top (4). A fixed ring (10) is fixed to the bottom end of the table top (4) through connecting pieces (9) on both sides, the fixed ring (10) is concentric with the connecting shaft (1) and has a certain gap with the table top (4). The fixed ring (10) is provided with a controller for controlling the start of the vibration device (16). The tube wall (21) is composed of four curved surfaces. The first curved surface (21A) and the second curved surface (21C) are oppositely arranged and fixed on the surface of the table top (4). The third curved surface (21B) and the fourth curved surface (21D) are oppositely arranged and fixed on the edge of the disc (22). The radii of the third curved surface (21B) and the fourth curved surface (21D) are slightly smaller than the radii of the first curved surface (21A) and the second curved surface (21C). When the connecting shaft (1) rotates, the disc (22) and the third curved surface (21B) and the fourth curved surface (21D) rotate together.
2. A device for rapidly determining the flowability of contrast powders as claimed in claim 1, characterized in that: The connecting shaft (1) is higher than the tube wall (21), and the top end of the connecting shaft (1) is provided with a cross knob (7) for rotation. The cross knob (7) is rotated clockwise, the connecting shaft (1) drives the third curved surface (21B) and the fourth curved surface (21D) on the disc (22) to rotate, the inner surfaces of the third curved surface (21B) and the second curved surface (21C) are attached, and the inner surfaces of the fourth curved surface (21D) and the first curved surface (21A) are attached.
3. The apparatus for rapidly determining the flowability of contrast powders of claim 1, wherein: The controller comprises a slip ring (11), a first metal block (13) and a second metal block (14) for limiting. The first metal block (13) and the second metal block (14) are arranged on the fixed ring (10), and two tangent lines with the first metal block (13) and the second metal block (14) as tangent points are perpendicular to each other. The fixed ring (10) is provided with a slip ring (11) between the first metal block (13) and the second metal block (14). The slip ring (11) is connected to the bottom center of the connecting shaft (1) through a connecting rod (12). The connecting shaft (1) drives the third curved surface (21B) and the fourth curved surface (21D) to rotate 0°-90°. The control switch of the vibration device (16) is connected to the contact piece (15) through a wire. The contact piece (15) has a gap with the first metal block (13), and the gap size is slightly smaller than the diameter of the slip ring (11), so that the slip ring (11) can contact the contact piece (15) while contacting the first metal block (13). The first metal block (13) is connected to the vibration device (16) through a loop wire.
4. The apparatus for rapidly determining the flowability of contrast powders of claim 1, wherein: The center of the disc (22) coincides with the center of the scale line (3).
5. The apparatus for rapidly determining the flowability of comparative powders as described in claim 1, characterized in that: The connecting shaft (1) is thicker at the section below the table top (4) than at the section above the table top (4); a groove with the same diameter as the outer diameter of the bearing (8) is formed in the center of the table top (4); a through hole is formed below the groove, and the inner diameter of the through hole is slightly larger than the outer diameter of the lower section of the connecting shaft (1).
6. The apparatus for rapidly determining the flowability of contrast powders of claim 1, wherein: The first curved surface (21A) and the second curved surface (21C) are marked with pipe wall scale lines.
7. The apparatus for rapidly determining flowability of contrast powders of claim 1, wherein: The support (5) is provided with a power switch (6) of the vibration device (16).