Measuring cylinder for testing micro-pressure tap density

Abstract

The utility model discloses a micro-pressure tap density test measuring cylinder, which comprises a measuring cylinder main body and a piston type flattening block arranged in the measuring cylinder main body and used for flattening powder in the measuring cylinder main body, the piston type flattening block comprises a flattening body, a sealing ring, a filtering assembly and a balancing weight, the sealing ring is arranged on the outer side of the flattening body, and the filtering assembly is arranged on the outer side of the flattening body. A gap between the flattening body and the inner wall of the measuring cylinder is sealed; the flattening body is provided with an air hole penetrating through the surface and the bottom face of the flattening body, and the filtering assembly is arranged at an inlet or an outlet of the air hole. The balancing weight is borne on the surface of the flattening body so that the flattening body can flatten powder. According to the measuring cylinder for testing the micro-pressure tap density, the problem that the surface of powder is uneven after the powder is compacted can be solved, the test difference between different devices can be reduced, and data tends to be stable.

Description

Technical Field

[0001] This utility model relates to a micro-pressure tap density testing device, and more particularly to a micro-pressure tap density testing measuring cylinder. Background Technology

[0002] In the field of battery materials technology, the main materials used are silicon-carbon, hard carbon, and artificial graphite, which require tap density testing during production. Tap density testing involves placing a certain amount of powder in a graduated cylinder and vibrating it until the powder volume no longer decreases. The tap density is obtained by dividing the powder mass by the volume after vibration. However, in actual testing, the powder surface is required to be leveled before the test, but after the test, the powder surface often fails to reach a level surface, exhibiting protrusions, peaks, and occasional spherical agglomerations, affecting the accuracy of the tap density test. Furthermore, due to the manufacturing precision issues and wear and tear during use of existing instruments and equipment, tap density tests often show increased fluctuations or unstable differences. Therefore, a micro-pressure tap density testing graduated cylinder and testing equipment are needed that can overcome the problem of uneven powder surfaces after vibration, reduce test differences between different devices, and stabilize test data from different devices. Utility Model Content

[0003] The purpose of this invention is to provide a micro-pressure compaction density testing cylinder that can overcome the problem of uneven surface after powder compaction, reduce test differences between different devices, and make the data more stable.

[0004] To achieve the above objectives, the micro-compacted density testing cylinder provided by this utility model includes a cylinder body and a piston-type flattening block disposed within the cylinder body for flattening powder within the cylinder body. The piston-type flattening block includes a flattening body, a sealing ring, a filter assembly, and a counterweight. The sealing ring is disposed on the outside of the flattening body to seal the gap between the flattening body and the inner wall of the cylinder. The flattening body has vent holes penetrating its surface and bottom surface, and the filter assembly is disposed at the inlet or outlet of the vent holes. The counterweight rests on the surface of the flattening body to flatten the powder.

[0005] Compared with existing technologies, this invention utilizes a piston-type flattening block within the measuring cylinder body. This block applies pressure to the powder, compacting it under a certain pressure and completely flattening its upper surface. Furthermore, the sealing ring of the piston-type flattening block seals the inside of the measuring cylinder body, while ventilation holes and a filter assembly on the block completely expel gas from the cylinder. This facilitates powder compaction, ensuring accurate readings within the measuring cylinder body and preventing powder leakage. This maintains a constant powder test volume, allowing for precise measurement of powder volume and calculation of accurate tapped density. Therefore, the entire micro-tapping density testing measuring cylinder can be used with different vibration devices, reducing test differences between devices and stabilizing or consistent test data, significantly improving the accuracy of tapped density testing.

[0006] Preferably, there are two sealing rings, with the two sealing rings respectively disposed on the upper and lower sides of the outer periphery of the flattening body. This results in a higher sealing performance between the piston-type flattening block and the measuring cylinder body, which helps to ensure the accuracy of the tapped density test.

[0007] Preferably, the flattening body has an arc-shaped protrusion in the center of its bottom surface. This allows the piston-type flattening block to be pressed more smoothly in the center, and ensures that the gap between the side wall of the flattening body and the inner side wall of the measuring cylinder body is consistent in the circumferential direction, thereby guaranteeing sealing performance.

[0008] Preferably, the flattening body has a receiving hole that communicates with the vent hole, and the filter assembly is disposed within the receiving hole. This facilitates the installation of the filter assembly, reduces the volume of the piston-type flattening block, and makes it easier to place inside the measuring cylinder body.

[0009] Specifically, the receiving hole extends towards and penetrates the upper surface of the flattening body. This facilitates the installation, removal, and replacement of the filter assembly, making replacement easier.

[0010] Specifically, the piston-type flattening block further includes a limiting plate, which is disposed on the upper surface of the flattening body and covers the receiving hole. The limiting plate restricts the position of the filter assembly, preventing it from accidentally detaching from the flattening body and ensuring sealing performance during the filtration process.

[0011] Specifically, the piston-type flattening block also includes a magnet, which is disposed on the flattening body and attracts the limiting plate through magnetic attraction, thereby positioning the limiting plate on the flattening body. By using the magnetic force of the magnet to hold the limiting plate, the filter assembly and the limiting plate can be positioned, and the assembly and disassembly of the filter assembly and the limiting component can be made more convenient and quick, improving the ease of use.

[0012] Preferably, the piston-type flattening block further includes a magnet, which is disposed on the flattening body and attracts the counterweight block through magnetic attraction, thereby positioning the counterweight block on the flattening body. By using a magnet to position the counterweight block, it is possible to prevent the counterweight block from deviating from the flattening body, ensuring that the upper surface of the powder can be flattened and improving the accuracy of the reading. It is also possible to prevent the counterweight block from impacting the measuring cylinder body during vibration or falling out of the measuring cylinder body during operation, thereby improving the safety of use. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the micro-pressure vibration density tester of this utility model.

[0014] Figure 2 This is a structural diagram of the micro-pressure vibration density testing cylinder of this utility model.

[0015] Figure 3 This is a side view of the piston-type flattening block of the micro-pressure vibration density testing cylinder of this utility model.

[0016] Figure 4 This is a top view of the internal structure of the flattened body of the micro-pressure vibration density testing cylinder of this utility model.

[0017] Figure 5 This is a bottom view of the flattened body of the micro-pressure vibration density testing cylinder of this utility model.

[0018] Figure 6 This is a flowchart of the micro-pressure vibration density testing method of this utility model. Detailed Implementation

[0019] To explain in detail the technical content, structural features, and effects achieved by this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0020] like Figures 1 to 5As shown, the micro-compacted density tester 100 of this utility model is suitable for vibratory compaction of powder, including a micro-compacted density testing cylinder 1 and a vibration device 2. The micro-compacted density testing cylinder 1 includes a cylinder body 11 and a piston-type flattening block 12 disposed inside the cylinder for flattening the powder inside the cylinder body 11. The piston-type flattening block 12 includes a flattening body 121, a sealing ring 122, a filter assembly 123, and a counterweight 124. The cross-section of the cylinder body 11 is circular, and the cross-section of the flattening body 121 is also circular. The outer diameter of the flattening body 121 is smaller than the inner diameter of the cylinder body 11, so that a certain gap is formed between the side walls of the two. The sealing ring 122 is disposed on the outside of the flattening body 121 to seal the gap between the flattening body 121 and the inner wall of the cylinder body 11. The flattening body 121 has vent holes 121a penetrating its surface and bottom surface. The filter assembly 123 is disposed at the inlet or outlet of the vent holes 121a. The filter assembly 123 is filter cotton, used to filter powder with a particle diameter greater than 0.1 μm. The counterweight 124 is supported on the surface of the flattening body 121. The counterweight 124 is a weight. The micro-compacted density testing cylinder 1 contains powder, and the piston-type flattening block 12 presses against the powder. The vibration device 2 is used to compact the powder in the micro-compacted density testing cylinder 1. When the counterweight 124 presses against the powder in the cylinder body 11 with a certain pressure, the piston-type flattening block 12 moves in a piston-like manner relative to the cylinder body 11 into the cylinder body 11. The gas in the cylinder body 11 is discharged outward from the vent holes 121a through the filter assembly 123, thus allowing the piston-type flattening block 12 to further flatten the powder.

[0021] Please see Figure 3 As shown, there are two sealing rings 122, which are respectively disposed on the upper and lower sides of the outer periphery of the flattening body 121. This improves the sealing performance between the piston-type flattening block 12 and the measuring cylinder body 11, thus ensuring the accuracy of the tapped density test. An arc-shaped protrusion 121b is provided in the center of the bottom surface of the flattening body 121. This allows the piston-type flattening block 12 to be pressed more stably in the middle, ensuring that the gap between the side wall of the flattening body 121 and the inner side wall of the measuring cylinder body 11 is consistent in the circumferential direction, thereby guaranteeing sealing performance.

[0022] Please refer to section 3. Figure 4 and Figure 5The flattening body 121 has receiving holes 121c. Multiple vent holes 121a are arranged circumferentially around the central axis of the flattening body 121. The receiving holes 121c and vent holes 121a are coaxially arranged and connected, corresponding one-to-one. In this embodiment, there are four vent holes 121a, four receiving holes 121c, and four filter components 123. The vent holes 121a are located near the bottom surface of the flattening body 121, and the receiving holes 121c are located near the surface surface of the flattening body 121. The receiving holes 121c extend towards the surface of the flattening body 121 and penetrate the upper surface of the flattening body 121. The diameter of the receiving hole 121c is larger than the diameter of the vent holes 121a. The filter components 123 are respectively disposed within the receiving holes 121c. This facilitates the installation and disassembly of the filter components 123, makes replacement more convenient, and reduces the volume of the piston-type flattening block 12, making its structure more compact and easier to place inside the measuring cylinder body 11.

[0023] For example Figure 3 , Figure 4 and Figure 5 As shown, the piston-type flattening block 12 also includes a limiting plate 125, which is disposed on the upper surface of the flattening body 121 and covers the receiving hole 121c. The limiting plate 125 limits the position of the filter assembly 123, preventing it from accidentally detaching from the flattening body 121 and ensuring sealing performance during the filtration process. The piston-type flattening block 12 also includes a magnet 126, which is embedded in the flattening body 121 and attracts the limiting plate 125 through magnetic attraction, positioning the limiting plate 125 on the flattening body 121. There are five magnets, one of which is coaxial with the central axis of the flattening body 121, and the other four are evenly distributed around the central axis of the flattening body 121 on its outer periphery. By using the magnetic force of magnet 126 to hold the limiting plate 125, the filter assembly 123 and the limiting component can be positioned, and the assembly and disassembly of the filter assembly 123 and the limiting plate 125 can be made more convenient and quick, improving the ease of use. Magnet 126 can also attract the counterweight 124 through magnetic attraction, positioning the counterweight 124 on the limiting plate 125 on the surface of the flattening body 121. Using magnet 126 to position the counterweight 124 prevents it from deviating from the flattening body 121, ensuring the upper surface of the powder is flattened and improving reading accuracy. It also prevents the counterweight 124 from impacting the measuring cylinder body 11 during vibration or falling out of the measuring cylinder body 11 during operation, improving safety.

[0024] Compared with the prior art, this invention, by setting a piston-type flattening block 12 inside the measuring cylinder body 11, applies pressure to the powder, allowing the powder to be compacted under a certain pressure, while the upper surface of the powder can be completely flattened. Furthermore, by sealing the inside of the measuring cylinder body 11 with the sealing ring 122 of the piston-type flattening block 12, and by providing vent holes 121a and a filter assembly 123 on the piston-type flattening block 12, the gas inside the measuring cylinder can be completely discharged, which is beneficial for compacting the powder and ensuring accurate readings of the powder within the measuring cylinder body 11. Simultaneously, it prevents powder leakage, ensuring a constant powder test volume, thus allowing for precise measurement of the powder volume and calculation of the accurate tapped density. Therefore, the entire micro-tapping density testing measuring cylinder 1 can be used on different vibration devices 2, reducing test differences between different vibration devices 2 and making the test data more stable or consistent, greatly improving the accuracy of the tapped density test of the entire micro-tapping density tester 100.

[0025] Please see Figure 6 This utility model also provides a micro-compacted density testing method, which uses the micro-compacted density tester 100 to perform a compaction test on powder, including the following steps:

[0026] Step S1: Select a micro-pressure tapped density test cylinder 1 with a suitable capacity. In this step, the size of the cylinder body 11 can be selected from common specifications such as 10ml, 25ml, 50ml, 100ml, 200ml, 250ml, and 500ml, depending on the amount of test powder. The corresponding piston-type flattening block 12 is selected to match the size of the cylinder body 11.

[0027] Step S2: Select a certain amount of test powder, fill the entire test powder into the measuring cylinder body 11, and weigh it to obtain the weight m; the weight is accurately read to 0.0001g, and place the piston-type flattening block 12 inside the measuring cylinder body 11 and press it above the test powder; after the test powder is completely filled into the measuring cylinder body 11, place the flattening body 121 on the upper surface of the test powder. During this process, the air inside the measuring cylinder body 11 will be discharged outward through the vent hole 121a and the filter assembly 123; then, place the counterweight 124 on the flattening body 121 and be attracted by the magnet 126.

[0028] Step S3: The micro-pressure compaction density test cylinder 1 is vertically fixed on the vibration device 2;

[0029] Step S4: After setting the test parameters of the vibration device 2, start the vibration device 2. Specifically, the vibration device 2 is electrically connected to the control system, and the test parameters specifically refer to the vibration frequency and vibration number of the vibration device 2. The vibration frequency and vibration number of the vibration device 2 can be input through the input module of the control system.

[0030] Step S5: Wait for the vibration device 2 to complete its vibration, and read the scale reading on the measuring cylinder body 11 corresponding to the lower edge of the piston-type flattening block 12 to obtain the volume of the test powder as V;

[0031] Step S6: Calculate the compaction density ρ of the test powder according to the compaction density relationship: ρ=m / V.

[0032] The following are specific examples of the test process based on the micro-pressure tap density test method described above:

[0033] Example 1:

[0034] Select a 50ml micro-tapping density testing cylinder 1 and place it on a balance, then zero the balance reading. Using a funnel, add 50g of hard carbon powder sample to the cylinder body 11, and read the balance reading to an accuracy of 0.0001g. The weighed mass is 50.0003g. Place the piston-type flattening block 12 into the cylinder body 11, and simultaneously place a 5g weight on the piston-type flattening block 12, which is attracted and fixed by the magnet 126. Fix the entire assembly of the piston-type flattening block 12 and the cylinder body 11, i.e., the micro-tapping density testing cylinder 1, onto the tapping device. Set the test parameters of the tapping device to a vibration frequency of 250 times / minute and a vibration count of 5000 times, and start the tapping device. After the vibration device 2 has completed its vibration, read the corresponding scale readings on the lower edge of the piston-type flattening block 12 and the measuring cylinder body 11, and record the volume / capacity. The measuring cylinder reading is 38.2 ml. Using the compaction density calculation formula ρ = m / V, the measurement result is calculated as ρ = 50.0003 / 38.2 = 1.309 g / cm³. 3 .

[0035] In Example 1 above, the sample weight range can be expanded to 5g-5000g, depending on the type of powder. The vibration frequency can be adjusted from 1-1000 times / minute. The number of vibrations ranges from 100-100000 times. The weight of the weights can be adjusted from 1g-1000g.

[0036] To verify the repeatability and accuracy of micro-tapping density, Example 2 is provided below. The same sample was used, and tests were conducted in two groups, with each group undergoing six tests. The repeatability and accuracy of the micro-tapping density were then verified based on the test results. The test steps are as follows:

[0037] Group 1: The micro-tapping density tester 100 of this scheme is used. Specifically, a 50ml micro-tapping density test cylinder 1 is selected and placed on a balance, then the balance reading is zeroed. Using a funnel, 50g of hard carbon powder sample is added to the cylinder body 11, and the balance reading is taken, accurate to 0.0001g. The mass weighed is 50.0003g. A piston-type flattening block 12 is placed in the cylinder body 11, and a 5g weight is placed on the piston-type flattening block 12, which is attracted and fixed by the magnet 126. The entire assembly of the piston-type flattening block 12 and the cylinder body 11, i.e., the micro-tapping density test cylinder 1, is fixed on the tapping device. The test parameters of the tapping device are set: vibration frequency of 250 times / minute and vibration count of 5000 times. The tapping device is then started. After the vibration device 2 has completed its vibration, read the corresponding scale readings on the lower edge of the piston-type flattening block 12 and the measuring cylinder body 11, and record the volume / capacity. Using the compaction density calculation formula ρ = m / V, calculate the measurement result as ρ = 50.0003 / 38.2 = 1.31 g / cm³. 3 Following the steps above, conduct 5 more tests and calculate the results of the remaining 5 measurements. Record these results in a table. The specific test results are as follows:

[0038] Micro-compression tap density tester 100 test results

[0039]

[0040]

[0041] Group 2: Using a standard tapped density tester without a leveling device on the graduated cylinder, take a 50ml graduated cylinder specifically designed for the standard tapped density tester, place it on a balance, and then zero the balance reading. Using a funnel, add 50g of hard carbon powder sample to the graduated cylinder, accurately reading to 0.0001g. The weighed mass in this case is 50.0025g. Fix the graduated cylinder on the standard tapped density tester. Set the test parameters for the standard tapped density tester: vibration frequency 250 times / minute, vibration count 5000 times. Start the standard tapped density tester and wait for the vibration to complete. Because the sample surface cannot form a horizontal plane after vibration, it is necessary to read the corresponding graduated cylinder scale from three directions / angles and record the readings. Finally, use the compaction density calculation formula ρ = m / V to calculate the average value of this measurement result. Continue the above steps for 5 more tests and calculate the results of the remaining 5 measurements. Record the above numbers in the table. The specific test results are as follows:

[0042] Test results of ordinary tap density tester

[0043]

[0044] As can be seen from the data in the two tables above,

[0045] Comparing the ranges of the two methods: the difference between the test results from the micro-compression vibration density tester 100 is smaller, with a range of only 0.006 g / cm³. 3 The range of results obtained using a standard tap density tester is 0.056 g / cm³. 3 The difference between the two is 9.3 times, therefore, the test results of the Micro-compression Vibration Density Tester 100 are better.

[0046] Comparing the standard deviations of the two methods reflects the dispersion of a dataset; the smaller the dispersion, the better the data. The standard deviation between the test results of the Micro-compression Vibration Density Tester 100 is 0.002, while the standard deviation of the test results of the ordinary vibration density tester is 0.019, a difference of 9.5 times. Therefore, the test results of the Micro-compression Vibration Density Tester 100 are superior.

[0047] The structure of the vibration device 2 involved in the micro-pressure vibration density tester 100 of this utility model is well known to those skilled in the art, and will not be described in detail here.

[0048] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. A micro-pressure tap density testing cylinder, characterized in that: The device includes a measuring cylinder body and a piston-type flattening block disposed within the measuring cylinder body for flattening powder within the measuring cylinder body. The piston-type flattening block includes a flattening body, a sealing ring, a filter assembly, and a counterweight. The sealing ring is disposed on the outside of the flattening body to seal the gap between the flattening body and the inner wall of the measuring cylinder. The flattening body has vent holes penetrating its surface and bottom surface, and the filter assembly is disposed at the inlet or outlet of the vent holes. The counterweight rests on the surface of the flattening body to flatten the powder.

2. The micro-pressure tapped density testing cylinder as described in claim 1, characterized in that: The number of sealing rings is two, and the two sealing rings are respectively disposed on the upper and lower sides of the outer periphery of the flattening body.

3. The micro-pressure tapped density testing cylinder as described in claim 1, characterized in that: The flattened body has an arc-shaped protrusion in the middle of its bottom surface.

4. The micro-pressure tapped density testing cylinder as described in claim 1, characterized in that: The flattening body has a receiving hole, which is connected to the air vent, and the filter assembly is disposed in the receiving hole.

5. The micro-pressure tapped density testing cylinder as described in claim 4, characterized in that: The receiving hole extends toward the surface of the flattening body and penetrates the upper surface of the flattening body.

6. The micro-pressure tapped density testing cylinder as described in claim 5, characterized in that: The piston-type flattening block also includes a limiting plate, which is disposed on the upper surface of the flattening body and covers the receiving hole.

7. The micro-pressure tapped density testing cylinder as described in claim 6, characterized in that: The piston-type flattening block also includes a magnet, which is disposed on the flattening body and attracts the limiting plate through magnetic attraction, thereby positioning the limiting plate on the flattening body.

8. The micro-pressure tapped density testing cylinder as described in claim 1, characterized in that: The piston-type flattening block also includes a magnet, which is disposed on the flattening body and attracts the counterweight block through magnetic attraction, thereby positioning the counterweight block on the flattening body.

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