Compaction die for testing compaction density of powder
By designing a compaction mold with a detachable inner sleeve and clamping structure, the problem of powder adhesion was solved, thereby improving the accuracy and efficiency of powder compaction density testing and expanding its applicable range.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-03-27
AI Technical Summary
In existing powder compaction density tests, the powder tends to stick to the inner wall of the mold, resulting in inaccurate test results and wasted testing time.
Design a compaction mold that includes a lower base, an upper pressure seat, an inner sleeve, and a top pressure column. The detachable design of the inner sleeve and the clamping action of the upper and lower gaskets prevent powder from sticking together. The compaction process is optimized by venting holes and buffer components to ensure testing accuracy and efficiency.
It improves the accuracy and efficiency of powder compaction density testing, prevents powder adhesion, simplifies inner sleeve replacement, reduces production costs, and enhances the practicality and applicability of the mold.
Smart Images
Figure CN224051722U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to new energy battery technical field especially is related to a kind of for powder compaction density
[0002] Tested compaction mould. BACKGROUND
[0003] Lithium ion battery is widely applied due to its advantages of high voltage, large energy density, good cycle performance, less self-discharge, no memory effect and green environmental protection. With the development of new energy vehicles and the increasing demand of people on electronic devices, lightweight and small size are the development trend of lithium ion battery. Currently, lithium ion battery is applied in electric vehicles, which requires to reduce battery size as much as possible to increase other space. An effective means to reduce battery size is to improve the compaction density of material, so the compaction density of material is an important performance index of lithium ion battery cathode material.
[0004] In the existing powder compaction density test, the powder is prone to adhere to the inner wall of the compaction mould during compaction. If the powder remaining in the inner wall of the compaction mould is not cleaned, it will affect the test results of the subsequent powder, resulting in inaccurate test results of the subsequent powder compaction density. If the powder remaining in the inner wall of the compaction mould is cleaned, the cleaning time is too long, which will waste the test time and reduce the test efficiency. UTILITY MODEL CONTENTS
[0005] The utility model aims at the deficiencies of the prior art, and provides a compaction mould for powder compaction density test, which can improve the accuracy of powder compaction density test, save test time and improve test efficiency.
[0006] The utility model provides a compaction mould for powder compaction density test, which comprises a lower base, an upper pressing seat, an inner sleeve and a top pressing column. The upper pressing seat is provided with a cavity with a top opening and a bottom opening. The lower base is connected to the bottom of the upper pressing seat to close the bottom opening of the cavity. The inner sleeve is inserted into the cavity to fill powder. The top pressing column is inserted into the inner sleeve to compact the powder.
[0007] Further, the compaction mould further comprises an upper gasket and a lower gasket arranged in the inner sleeve. The powder is loaded between the upper gasket and the lower gasket. The lower base supports the lower gasket.
[0008] Further, the cavity comprises a material receiving cavity and a material pressing cavity arranged in sequence from bottom to top. The material pressing cavity is in communication with the material receiving cavity. The lower base is inserted into the material receiving cavity from the bottom of the material receiving cavity. The inner sleeve is inserted into the material pressing cavity.
[0009] Further, the cavity further comprises a limiting cavity arranged at the top of the material pressing cavity, the inner sleeve comprises a sleeve body and a limiting portion arranged at the top of the sleeve body, the sleeve body is inserted into the material pressing cavity, the limiting portion is inserted into the limiting cavity, and the height of the limiting portion is greater than the depth of the limiting cavity.
[0010] Further, the lower base comprises an insertion portion inserted into the material pressing cavity and a pressing portion abutting against the upper pressing seat, and the cross-sectional area of the pressing portion is greater than that of the insertion portion.
[0011] Further, the lower base further comprises a sealing ring arranged at the outer periphery of the insertion portion, and the sealing ring is used to seal the gap between the insertion portion and the material pressing cavity.
[0012] Further, the lower base further comprises a deflation hole extending from the top of the insertion portion to one side of the pressing portion.
[0013] Further, the lower base is provided with a buffer cavity, and the compaction mold further comprises a buffer member arranged in the buffer cavity, and the buffer member is used to buffer the impact force of the top pressing column.
[0014] Further, the buffer member comprises a buffer seat arranged at the bottom of the buffer cavity, a buffer spring arranged at the top of the buffer seat, and a buffer column arranged at the top of the buffer spring, and the buffer column abuts against the lower gasket.
[0015] Further, the inner wall of the buffer cavity is provided with a stop portion, and the stop portion is used to stop the buffer column.
[0016] The compaction mold for powder compaction density testing has the following beneficial effects:
[0017] (1) The compaction mold is provided with an inner sleeve in the upper pressing seat cavity, the powder is loaded in the inner sleeve, the powder in the inner sleeve is compacted by the top pressing column, the inner sleeve is detachable in the cavity of the upper pressing seat, the inner sleeve is replaced, the accuracy of the powder compaction density test is improved, the test time is saved, and the test efficiency is improved.
[0018] (2) The compaction mold further comprises upper and lower gaskets arranged in the inner sleeve, so that the lower gasket and the upper gasket act on the powder when the top pressing column is pressed to compact the powder, instead of the top pressing column directly acting on the powder, on the one hand, to prevent the powder from adhering to the fixed pressing column and affecting the accuracy of the test result, and on the other hand, to improve the compaction effect of the powder.
[0019] (3) The cavity of the compaction mold includes a material resisting cavity and a material pressing cavity, when the upper pressing base is arranged on the lower base, the lower base is inserted into the material resisting cavity from the bottom of the material resisting cavity, so that the bottom opening of the material pressing cavity is closed by the lower base, the inner sleeve is arranged in the material pressing cavity, after the powder is loaded in the inner sleeve, the top pressing column is inserted into the inner sleeve from the top opening of the material pressing cavity, so that the powder in the inner sleeve is compacted by the top pressing column pressed by the pressure equipment;
[0020] (4) The height of the limiting part of the compaction mold is greater than the depth of the limiting cavity, so that when the limiting part is inserted into the limiting cavity, the height range of the limiting part exceeds the range of the limiting cavity, so that when the inner sleeve is inserted into the cavity of the upper pressing base, the inner sleeve is taken out of the cavity by the part of the limiting part exceeding the limiting cavity, and then the replacement of the inner sleeve is simple and convenient, easy to implement, and the practicality of the compaction mold is further enhanced;
[0021] (5) The lower base of the compaction mold includes an insertion part and a pressing part, the insertion part is arranged at the top of the pressing part, and the cross-sectional area of the pressing part is greater than that of the insertion part, when the upper pressing base is arranged on the lower base, the insertion part is inserted into the material resisting cavity through the bottom opening of the material resisting cavity, and the non-opening area at the bottom of the upper pressing base is pressed on the pressing part, so that the pressing part supports the upper pressing base, and the insertion part closes the bottom opening of the material pressing cavity;
[0022] (6) The lower base of the compaction mold further includes a sealing ring, the sealing ring is arranged on the outer periphery of the insertion part, when the insertion part is inserted into the material resisting cavity from the bottom opening of the material resisting cavity, the sealing ring seals the gap between the insertion part and the material resisting cavity, preventing the powder from overflowing or leaking out of the gap between the insertion part and the material resisting cavity during the powder compaction process, thereby improving the effect of powder compaction and ensuring the accuracy of test results;
[0023] (7) The lower base of the compaction mold is provided with a gas vent hole, the gas vent hole extends from the top of the insertion part to one side of the pressing part, and the gas vent hole extending to one side of the pressing part is in communication with the outside, during the powder compaction process, the compressed gas in the cavity is discharged through the gas vent hole on the lower base, avoiding excessive local pressure, thereby improving the uniformity and consistency of the powder compaction;
[0024] (8) The compaction mold further includes a buffer, a buffer cavity is arranged in the lower base, and the buffer is arranged in the buffer cavity, when the upper pressing base is arranged on the lower base, the buffer closes the bottom opening of the material pressing cavity, so that when the top pressing column in the inner sleeve is pressed by the pressure equipment during the powder compaction process, the impact force of the top pressing column is buffered by the buffer moving in the buffer cavity, thereby prolonging the service life of the mold and reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS
[0025] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In these drawings, like reference numerals are used to represent similar elements.
[0026] Figure 1 A structure schematic view of a compaction mold for powder compaction density test of an embodiment of the present application;
[0027] Figure 2 A sectional schematic view of a compaction mold for powder compaction density test of an embodiment of the present application;
[0028] Figure 3 A structure schematic view of a bottom of an upper pressing seat of a compaction mold for powder compaction density test of an embodiment of the present application;
[0029] Figure 4 A structure schematic view of a top of an upper pressing seat of a compaction mold for powder compaction density test of an embodiment of the present application
[0030] Figure 5 A structure schematic view of a lower base of a compaction mold for powder compaction density test of an embodiment of the present application;
[0031] Figure 6 A structure schematic view of an inner sleeve of a compaction mold for powder compaction density test of an embodiment of the present application;
[0032] Figure 7 A structure schematic view of a buffer of a compaction mold for powder compaction density test of an embodiment of the present application.
[0033] In the figure: 1, lower base; 11, plug-in part; 12, pressure joint part; 13, sealing ring; 14, air vent hole; 15, buffer cavity; 16, stop part; 2, upper pressing seat; 21, material resisting cavity; 22, material pressing cavity; 23, limiting cavity; 3, inner sleeve; 31, cylinder body; 32, limiting part; 4, top pressing column; 5, lower gasket; 6, upper gasket; 7, buffer; 71, buffer seat; 72, buffer spring; 73, buffer column. DETAILED DESCRIPTION
[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the present application all belong to the protection scope of the present application.
[0035] Please refer to Figures 1-6The utility model discloses an embodiment of a kind of compaction mould for powder compaction density test, including lower base 1, upper pressure seat 2, inner sleeve 3 and top pressure column 4, upper pressure seat 2 is equipped with the cavity of top and bottom opening, lower base 1 is connected with the bottom of upper pressure seat 2, to close the bottom opening of cavity, inner sleeve 3 is inserted in cavity, to fill powder, top pressure column 4 is inserted in inner sleeve 3, for the compaction of powder.
[0036] In the present application, the compaction mould includes lower base 1 and upper pressure seat 2, a cavity is provided in the upper pressure seat 2, and the top and bottom of the cavity are provided with openings. The upper pressure seat 2 is placed on the lower base 1, and the lower base 1 is connected with the bottom of the upper pressure seat 2, so that the lower base 1 closes the bottom opening of the cavity. The compaction mould further includes an inner sleeve 3 and a top pressure column 4, the inner sleeve 3 is inserted into the cavity from the top opening of the cavity, and the top pressure column 4 is inserted into the inner sleeve 3 from the top of the upper pressure seat 2.
[0037] When performing the compaction density test of the powder, the powder is loaded in the inner sleeve 3. Since the lower base 1 closes the bottom opening of the cavity, the lower base 1 closes the bottom of the inner sleeve 3, and the top pressure column 4 is inserted into the inner sleeve 3 from the top of the upper pressure seat 2. The compaction mould is placed on the compaction platform, and the top pressure column 4 is pressed down by the pressure equipment, so that the powder in the inner sleeve 3 is compacted, in order to perform the compaction density test of the powder.
[0038] Since the inner sleeve 3 in the present application can be detached in the cavity of the upper pressure seat 2, multiple inner sleeves 3 can be prepared at the same time when performing the compaction density test of the powder. After completing the compaction of the powder once, the inner sleeve 3 is taken out from the cavity for replacement, and the next compaction of the powder is performed, until the compaction density test of the powder is completed. Thus, the accuracy of the compaction density test of the powder can be improved, and the time for cleaning the inner sleeve 3 during the test is reduced, thereby saving the test time and improving the test efficiency. After the compaction density test of all the powders is completed, the used inner sleeves 3 are cleaned collectively for subsequent use.
[0039] Specifically, in actual implementation, according to the test formula of the compaction density of the powder: wherein M is the mass of the powder to be detected, in grams; V is the volume of the compacted powder, in cubic centimeters; and ρ is the measured compaction density of the powder, in grams per cubic centimeter. 3 3 .
[0040] Since the compacted powder is in the shape of a cylinder, the volume of the compacted powder is wherein r is the radius of the cylinder formed after the powder is compacted, in centimeters; H is the height of the cylinder formed after the powder is compacted, in centimeters; and the compaction density of the powder is .
[0041] Therefore, when the compaction density of the powder is tested, the weight of the powder to be tested is weighed and recorded first, then the powder is compacted by the compaction mold, and finally the radius and height of the cylinder formed after the powder is compacted are measured, so that the compaction density of the powder can be calculated, thereby realizing the test of the compaction density of the powder.
[0042] In actual implementation, since the powder is compacted in the inner sleeve 3, the inner diameter of the inner sleeve 3 corresponds to the diameter of the cylinder formed after the powder is compacted, so that the radius of the cylinder formed after the powder is compacted, i.e. the compaction density of the powder, can be obtained by measuring the inner diameter of the inner sleeve 3. wherein φ is the inner diameter of the inner sleeve 3, and the unit is cm.
[0043] Compared with measuring the diameter of the cylinder formed after the powder is compacted, the operation of measuring the inner diameter of the inner sleeve 3 is easier to realize, so that the test of the compaction density of the powder is more simple and convenient and easy to implement, thereby saving the test time and improving the test efficiency.
[0044] It can be predicted that in the present application, a plurality of inner sleeves 3 with the same outer diameter and different inner diameters can be provided, the outer diameters of the plurality of inner sleeves 3 are the same, which can ensure that the plurality of inner sleeves 3 can be inserted and matched with the cavity of the upper pressure seat 2, and the inner diameters of the plurality of inner sleeves 3 are different, so that different diameters of the powder can be compacted by replacing the inner sleeves 3 with different inner diameters, thereby making the application range of the compaction mold wider and the practicality stronger.
[0045] In the present embodiment, the compaction mold further comprises an upper gasket 6 and a lower gasket 5 arranged in the inner sleeve 3, the powder is loaded between the upper gasket 6 and the lower gasket 5, and the lower base 1 supports the lower gasket 5. In the present application, the compaction mold further comprises the upper gasket 6 and the lower gasket 5, the lower gasket 5 and the upper gasket 6 are arranged in the inner sleeve 3 from bottom to top, and when the bottom of the inner sleeve 3 is closed by the lower base 1, the lower base 1 abuts against the lower gasket 5, so that the lower base 1 supports the lower gasket 5, and the powder is loaded between the upper gasket 6 and the lower gasket 5.
[0046] Specifically, when the compaction density of the powder is tested, the lower gasket 5 is first loaded into the inner sleeve 3 from the top opening of the cavity, then the weighed powder is loaded into the inner sleeve 3 from the top opening of the cavity, and then the upper gasket 6 is loaded into the inner sleeve 3 from the top opening of the cavity, so that the lower gasket 5 and the upper gasket 6 clamp the powder, and finally the top pressing column 4 is inserted into the inner sleeve 3 from the top opening of the cavity, and the top pressing column 4 is pressed down by the pressure equipment, so that the top pressing column 4 compacts the powder clamped between the lower gasket 5 and the upper gasket 6.
[0047] In the present application, the lower gasket 5 and the upper gasket 6 are arranged to act on the powder through the lower gasket 5 and the upper gasket 6 instead of directly acting on the powder through the top pressing column 4 when the top pressing column 4 presses down to compact the powder. On the one hand, this prevents the powder from adhering to the top pressing column 4, affecting the accuracy of the test results. On the other hand, this improves the stability and uniformity of the powder compaction.
[0048] In the foregoing embodiment, it is mentioned that a plurality of inner sleeves 3 with the same outer diameter and different inner diameters can be arranged, and the top pressing column 4 is inserted into the inner sleeve 3, and the lower gasket 5 and the upper gasket 6 are arranged in the inner sleeve 3. Therefore, in actual powder compaction density testing, a plurality of top pressing columns 4, lower gaskets 5, and upper gaskets 6 with different diameters can be arranged to match a plurality of inner sleeves 3 with different inner diameters, so that the present compaction mold can compact powders with different diameters, thereby making the present compaction mold have a wider range of applications and stronger practicality.
[0049] In the present embodiment, the cavity includes a material resisting cavity 21 and a material compacting cavity 22 arranged in sequence from bottom to top, the material compacting cavity 22 communicates with the material resisting cavity 21, the lower base 1 is inserted into the material resisting cavity 21 from the bottom of the material resisting cavity 21, and the inner sleeve 3 is inserted into the material compacting cavity 22. In the present application, the cavity includes the material resisting cavity 21 and the material compacting cavity 22, which are arranged in sequence from bottom to top, and the top of the material resisting cavity 21 communicates with the bottom of the material compacting cavity 22.
[0050] It can be predicted that the cross-sectional area of the material resisting cavity 21 is greater than that of the material compacting cavity 22, so when the upper pressing seat 2 is arranged on the lower base 1, the lower base 1 is inserted into the material resisting cavity 21 from the bottom opening of the material resisting cavity 21, thereby closing the bottom opening of the material compacting cavity 22 through the lower base 1. The inner sleeve 3 is inserted into the material compacting cavity 22 from the top opening of the material compacting cavity 22, and after the powder is loaded into the inner sleeve 3, the top pressing column 4 is inserted into the inner sleeve 3 from the top of the upper pressing seat 2, so that the powder in the inner sleeve 3 is compacted by the pressure equipment pressing down the top pressing column 4.
[0051] In the present embodiment, the cavity further includes a limiting cavity 23, which is arranged at the top of the material compacting cavity 22, i.e., the material resisting cavity 21, the material compacting cavity 22, and the limiting cavity 23 are arranged in sequence from bottom to top in the upper pressing seat 2, and the material resisting cavity 21, the material compacting cavity 22, and the limiting cavity 23 communicate with each other, and the bottom of the material resisting cavity 21 communicates with the outside, and the top of the limiting cavity 23 communicates with the outside.
[0052] The inner sleeve 3 comprises a sleeve body 31 and a limiting part 32, the limiting part 32 is arranged at the top of the sleeve body 31, and the sleeve body 31 is inserted into the pressing cavity 22 from the top opening of the limiting cavity 23, while the limiting part 32 is inserted into the limiting cavity 23. By the insertion of the limiting part 32 into the limiting cavity 23, the insertion depth of the sleeve body 31 in the pressing cavity 22 is limited, so that the bottom of the sleeve body 31 is flush with the bottom of the pressing cavity 22, thereby when the lower base 1 is inserted into the pressing cavity 21 from the bottom opening of the pressing cavity 21, the bottom of the sleeve body 31 is closed, and the powder can be loaded into the sleeve body 31, so that the use of the compaction mold is more simple and convenient.
[0053] In the present application, the height of the limiting part 32 is greater than the depth of the limiting cavity 23, so when the limiting part 32 is inserted into the limiting cavity 23, the height of the limiting part 32 exceeds the range of the limiting cavity 23, thereby when the inner sleeve 3 is inserted into the cavity of the upper pressing base 2, the inner sleeve 3 can be easily taken out of the cavity by the part of the limiting part 32 exceeding the limiting cavity 23, and the replacement of the inner sleeve 3 is simple and convenient, and the practicality of the compaction mold is further enhanced.
[0054] In the present embodiment, the lower base 1 comprises an insertion part 11 inserted into the pressing cavity 21, and a pressing part 12 abutting against the upper pressing base 2, and the cross-sectional area of the pressing part 12 is greater than that of the insertion part 11. In the present application, the lower base 1 comprises the insertion part 11 and the pressing part 12, the insertion part 11 is arranged at the top of the pressing part 12, and the cross-sectional area of the pressing part 12 is greater than that of the insertion part 11.
[0055] When the upper pressing base 2 is arranged on the lower base 1, the insertion part 11 is inserted into the pressing cavity 21 through the bottom opening of the pressing cavity 21, and the non-opening area of the bottom of the upper pressing base 2 is pressed on the pressing part 12, so that the pressing part 12 supports the upper pressing base 2, and the insertion part 11 closes the bottom opening of the pressing cavity 22.
[0056] In the present embodiment, the lower base 1 further comprises a sealing ring 13 arranged at the outer periphery of the insertion part 11, and the sealing ring 13 is used to seal the gap between the insertion part 11 and the pressing cavity 21. In the present application, the lower base 1 further comprises the sealing ring 13, and the sealing ring 13 is arranged at the outer periphery of the insertion part 11. When the insertion part 11 is inserted into the pressing cavity 21 from the bottom opening of the pressing cavity 21, the sealing ring 13 seals the gap between the insertion part 11 and the pressing cavity 21, so as to prevent the powder from overflowing or leaking out of the gap between the insertion part 11 and the pressing cavity 21 during the compaction of the powder, thereby improving the compaction effect of the powder and ensuring the accuracy of the test results.
[0057] In the embodiment, the lower base 1 further comprises a vent hole 14 extending from the top of the plug-in part 11 to one side of the crimping part 12. In the application, the lower base 1 is provided with the vent hole 14 extending from the top of the plug-in part 11 to one side of the crimping part 12, and the vent hole 14 extending to one side of the crimping part 12 is in communication with the outside. In the process of powder compaction, the compressed gas in the cavity is discharged through the vent hole 14 on the lower base 1, so as to avoid local overpressure and improve the uniformity and consistency of powder compaction.
[0058] In the embodiment, the lower base 1 is provided with a buffer cavity 15, and the compaction mold further comprises a buffer piece 7 arranged in the buffer cavity 15, which is used to buffer the impact force of the top pressing column 4. In the application, the compaction mold further comprises the buffer piece 7, and the lower base 1 is provided with the buffer cavity 15, and the buffer piece 7 is arranged in the buffer cavity 15. When the upper pressing base 2 is arranged on the lower base 1, the buffer piece 7 closes the bottom opening of the material pressing cavity 22.
[0059] In the process of powder compaction, when the pressure equipment presses the top pressing column 4 in the inner sleeve 3, the buffer piece 7 moves in the buffer cavity 15 to buffer the impact force of the top pressing column 4, so as to prolong the service life of the mold and reduce the production cost.
[0060] In the embodiment, the buffer piece 7 comprises a buffer seat 71 arranged at the bottom of the buffer cavity 15, a buffer spring 72 arranged at the top of the buffer seat 71, and a buffer column 73 arranged at the top of the buffer spring 72, and the buffer column 73 abuts against the lower gasket 5. In the application, the buffer piece 7 comprises the buffer seat 71, the buffer spring 72 and the buffer column 73, the buffer seat 71 is arranged at the bottom of the buffer cavity 15, the buffer spring 72 is arranged at the top of the buffer seat 71, and the buffer column 73 is arranged at the top of the buffer spring 72, that is, one end of the buffer spring 72 is connected with the buffer seat 71, and the other end is connected with the buffer column 73.
[0061] When the upper pressing base 2 is arranged on the lower base 1, the buffer column 73 closes the bottom opening of the material pressing cavity 22; in the process of powder compaction, the pressure equipment presses the top pressing column 4 in the inner sleeve 3, the top pressing column 4 applies pressure to the buffer column 73 through the upper gasket 6, the powder and the lower gasket 5, so that the buffer column 73 moves in the buffer cavity 15 to compress the buffer spring 72, thereby buffering the impact force of the top pressing column 4 through the buffer spring 72, and prolonging the service life of the mold and reducing the production cost.
[0062] In the embodiment, the inner wall of the buffer cavity 15 is provided with a stop portion 16. When the pressure device presses the pressing column 4 in the inner sleeve 3, the pressing column 4 exerts pressure on the buffer column 73 through the upper gasket 6, the powder and the lower gasket 5, so that the buffer spring 72 is compressed when the buffer column 73 moves downward in the buffer cavity 15, the buffer spring 72 buffers the impact force of the pressing column 4, until the buffer column 73 abuts against the stop portion 16, so that the buffer column 73 is prevented from further moving downward by the stop portion 16, and the powder between the upper gasket 6 and the lower gasket 5 is compacted under the pressure of the pressing column 4.
[0063] It can be foreseen that the stop portion 16 is arranged in the middle of the inner wall of the buffer cavity 15, when the buffer column 73 does not bear pressure and the buffer spring 72 is in a natural elongation state, the bottom of the buffer column 73 is inserted into the buffer cavity 15 and the top extends in the pressing cavity 22.
[0064] When the pressing column 4 exerts pressure on the buffer column 73, the buffer column 73 moves downward in the buffer cavity 15, the buffer spring 72 is compressed, until the buffer column 73 abuts against the stop portion 16 in the middle of the inner wall of the buffer cavity 15, at this time, the buffer column 73 is completely retracted into the buffer cavity 15, so that the top of the buffer column 73, the top of the buffer cavity 15 and the bottom of the pressing cavity 22 are just on the same horizontal plane, so that the buffer column 73 better seals the bottom of the pressing cavity 22; when the pressing column 4 continues to exert pressure, the powder between the upper gasket 6 and the lower gasket 5 is compacted by preventing the buffer column 73 from moving downward by the stop portion 16.
[0065] The above description can be implemented alone or in various combinations, and these variants are within the protection scope of the utility model.
[0066] It should be noted that, in this document, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying that there is any such actual relationship or order between these entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus that includes a list of elements does not only include those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.
[0067] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not limit it. Although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.
Claims
1. A compaction die for powder compaction density testing, characterized by: The compacting mold comprises a lower base (1), an upper pressing base (2), an inner sleeve (3), and a top pressing column (4), the upper pressing base (2) is internally provided with a cavity with a top opening and a bottom opening, the lower base (1) is connected with the bottom of the upper pressing base (2) to close the bottom opening of the cavity, the inner sleeve (3) is inserted into the cavity to fill the powder, and the top pressing column (4) is inserted into the inner sleeve (3) to compact the powder.
2. A compaction die for powder compact density testing as claimed in claim 1, characterised in that: The compacting mold further comprises an upper gasket (6) and a lower gasket (5) arranged in the inner sleeve (3), the powder is loaded between the upper gasket (6) and the lower gasket (5), and the lower base (1) supports the lower gasket (5).
3. A compaction die for powder compact density testing as defined in claim 1, characterized by: The cavity comprises a material receiving cavity (21) and a material pressing cavity (22) arranged in sequence from bottom to top, the material pressing cavity (22) is communicated with the material receiving cavity (21), the lower base (1) is inserted into the material receiving cavity (21) from the bottom of the material receiving cavity (21), and the inner sleeve (3) is inserted into the material pressing cavity (22).
4. A compaction die for use in powder compact density testing as defined in claim 3, characterized in that: The cavity further comprises a limiting cavity (23) arranged at the top of the material pressing cavity (22), the inner sleeve (3) comprises a sleeve body (31) and a limiting portion (32) arranged at the top of the sleeve body (31), the sleeve body (31) is inserted into the material pressing cavity (22), the limiting portion (32) is inserted into the limiting cavity (23), and the height of the limiting portion (32) is greater than the depth of the limiting cavity (23).
5. A compaction die for use in powder compact density testing as defined in claim 3, characterized by: The lower base (1) comprises an insertion portion (11) inserted into the material receiving cavity (21) and a pressing portion (12) abutting with the upper pressing base (2), and the cross-sectional area of the pressing portion (12) is greater than that of the insertion portion (11).
6. A compaction die for powder compact density testing as claimed in claim 5, characterised in that: The lower base (1) further comprises a sealing ring (13) arranged at the outer periphery of the insertion portion (11), and the sealing ring (13) is used to seal the gap between the insertion portion (11) and the material receiving cavity (21).
7. A compaction die for powder compact density testing as defined in claim 5, characterized by: The lower base (1) further comprises a deflation hole (14) extending from the top of the insertion portion (11) to one side of the pressing portion (12).
8. A compaction die for powder compact density testing as defined in claim 2, characterized by: The lower base (1) is internally provided with a buffer cavity (15), and the compacting mold further comprises a buffer member (7) arranged in the buffer cavity (15), and the buffer member (7) is used to buffer the impact force of the top pressing column (4).
9. A compaction die for powder compact density testing as claimed in claim 8, characterised in that: The buffer member (7) comprises a buffer seat (71) arranged at the bottom of the buffer cavity (15), a buffer spring (72) arranged at the top of the buffer seat (71), and a buffer column (73) arranged at the top of the buffer spring (72), and the buffer column (73) abuts with the lower gasket (5).
10. A compaction die for use in powder compact density testing as defined in claim 9, characterized by: The inner wall of the buffer cavity (15) is provided with a stop portion (16) used to stop the buffer column (73).