Device for improving compaction test stability

Abstract

The utility model relates to the technical field of lithium iron phosphate powder detection, in particular to a device for improving compaction test stability, which comprises a base, one end of the outer wall of the base is in sliding connection with a baffle, the inner wall of a notch at the axis of the base is in threaded connection with a first pressure gasket, and the top of the base is in inserted connection with a bucket-shaped mold. A limiting assembly is installed in the base, and the bucket-shaped mold is connected to the base in an inserted mode through the limiting assembly. According to the improved device for testing the stability, one end of the baffle structure is high, the other end of the baffle structure is low, a feeding opening is covered on a larger area to prevent powder from scattering, visual reference points are provided for operators, the structural design of the bucket-shaped mold and the bucket cover expands a feeding channel, the risk of powder scattering is reduced, a pressure applying structure and a sealing structure are integrated, and the stability is improved. And the second pressure gasket is controlled to descend by rotating the screw rod, an operator can accurately adjust the pressure according to requirements, and the optimal compaction effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium iron phosphate powder detection, in particular to a device for improving the stability of compaction testing. Background Art

[0002] Lithium iron phosphate powder is a powdery compound composed of lithium, iron, phosphorus and other elements. Lithium iron phosphate has an olivine crystal structure. Lithium iron phosphate powder is mainly used in the manufacture of positive electrode materials for lithium-ion batteries, providing reliable energy storage solutions for modern electronic devices, electric vehicles, etc.

[0003] In lithium-ion battery production, electrode materials usually need to undergo compaction processing. Therefore, by performing compaction testing on lithium iron phosphate powder, we can get closer to the state of the actual battery manufacturing process, thereby better evaluating the performance of the material in actual applications. Before testing, it is necessary to use a specially designed compaction mold to apply a specific amount of pressure to the lithium iron phosphate powder to ensure the consistency and repeatability of the compaction degree.

[0004] In the process of realizing the present invention, the inventors discovered that the existing technology has the following problems: 1. However, the inner diameter of the circular hole currently used for measuring the mold is usually small, only 13 mm, so there is a risk of powder flying and spilling out of the mold during the process of pouring powder, and the reduction in the amount of powder will cause a large deviation in the data; 2. In addition, some detection molds have insufficient sealing performance due to their structure to facilitate subsequent material removal, resulting in the problem of powder overflow during the pressure application process. Utility Model Content

[0005] The purpose of the present invention is to provide a device for improving the stability of compaction testing, so as to solve the above-mentioned problems in the background art, such as the problem that powder overflow is easy to occur when feeding due to the small aperture and the problem that the sealing is insufficient during the compaction process. In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for improving the stability of compaction testing, comprising a base, a baffle is slidably connected to one end of the outer wall of the base, a first pressure gasket is threadedly connected to the inner wall of the notch at the axis of the base, a bucket-shaped mold is plugged into the top of the base, a limiting assembly is installed inside the base, the bucket-shaped mold is plugged into the base through the limiting assembly, a bucket cover is threadedly connected to the top of the bucket cover, a rubber plug is plugged into the inside of the bucket cover, a screw is passed through the top of the rubber plug and is threadedly connected, the screw is rotatably connected to a connecting disk at the shaft head below, and the bottom of the connecting disk is threadedly connected to a second pressure gasket.

[0006] The limiting assembly includes a limiting plug and an external pull rod. The limiting plugs are symmetrically distributed and respectively located in cavities set at both ends inside the base. The tops of the limiting plugs are glued to the external pull rods. The external pull rods are symmetrically distributed and respectively slidably connected to the slide grooves at both ends of the top of the base. The surfaces of the two external pull rods are respectively rotatably connected with the first docking block and the second docking block, and the first docking block and the second docking block are snap-connected.

[0007] Further preferably, the baffle is in the shape of an arc-shaped curved surface, and the baffle is distributed above the bucket cover in an inclined shape as a whole.

[0008] Further preferably, a groove for inserting and connecting a rubber plug is opened on one side of the outer wall of the base, and several groups of support columns that are attached to the bottom of the first pressure gasket are opened at the axis of the base, and an exhaust port is opened on one side of the outer wall of the base, and the exhaust port is connected to the cavity where the first pressure gasket is located. The exhaust port is located on the outer wall of the pipe mouth outside the base and is threadedly connected to a filter plate.

[0009] Further preferably, the top of the bucket-shaped mold and the top of the bucket cover are both wide at the top and narrow at the bottom, and the bottom of the bucket-shaped mold is cylindrical, and the bottom of the cylinder is through-shaped, and the first pressure gasket is attached to the cylindrical inner wall below the bucket-shaped mold.

[0010] Further preferably, a fine grid structure is provided through the surfaces of the first pressure gasket and the second pressure gasket.

[0011] Further preferably, a ring-shaped slot for plugging and connecting to the bucket-shaped mold is provided at the axis center of the top of the base, and one end of the limit plug passes through the slot and is plugged and connected to the slot corresponding to the bucket-shaped mold, and the other end of the limit plug is movably connected to the cavity of the base through a spring, and at the same time, the limit plugs are elastically reset by external pull rods, and relative movement is formed between the limit plugs.

[0012] Further preferably, the rubber plug is plugged into the notch at the axis of the bucket cover, and the second pressure gasket forms a lifting structure through a screw, and the second pressure gasket is attached to and slidably connected to the cylindrical inner wall below the bucket mold.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In the present invention, in the two groups of gasket structures, the first pressure gasket serves as a powder support carrier, and the support column below it provides stable support to ensure that the powder is evenly compressed and the uniformity of the compaction density is improved. The exhaust port is set to discharge air during the powder compaction process, so that the powder particles are in close contact and a higher compaction density is achieved. The external filter disc adopts a polytetrafluoroethylene membrane to prevent dust from overflowing while ensuring good air permeability, thereby keeping the operating area clean, reducing material waste, and reducing potential hazards to the health of operators. The grid-shaped gasket structure allows gas to be discharged while blocking powder from falling, ensuring that the powder position is stable during the compaction process. The bucket-shaped mold is sleeved on the outside of the first pressure gasket to provide a protective shell for the compacted powder, ensuring the integrity of the powder during external inspection. The interlocking structure of the rubber plug and the bucket cover forms a good seal to prevent powder from overflowing, so that the compaction process is carried out in a relatively closed space, further improving the compaction effect and operational safety.

[0015] In the present utility model, firstly, the baffle structure is higher at one end and lower at the other end, which not only covers the feeding port over a larger area to prevent powder from flying, but also provides a visual reference point for the operator, making the feeding progress and powder flow conditions clear at a glance, greatly improving the convenience of feeding. The structural design of the bucket mold and the bucket cover expands the feeding channel and reduces the risk of powder flying. The structure of the bucket cover being higher than the bucket mold facilitates loading and unloading operations. The structure of placing a rubber plug on the outer wall of the base avoids the loss of split parts. At the same time, the detachable bucket mold and bucket cover structure connected by threads is not only easy to clean, but also shows a high degree of flexibility during operation. In addition, the pressure structure and the sealing structure are integrated into one. By turning the screw to control the descent of the second pressure gasket, the operator can accurately adjust the pressure according to needs to achieve the best compaction effect. The elastic structure of the limit plug enables the bucket mold to be quickly installed and disassembled, improving operating efficiency and reducing operating time and labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the bucket mold and bucket cover structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the bucket-shaped mold of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the limit assembly of the utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the rubber stopper of the present utility model.

[0021] In the figure: 1. Base; 2. Baffle; 3. First pressure gasket; 4. Bucket-shaped mold; 5. Limit assembly; 501. Limit plug; 502. External pull rod; 503. First docking block; 504. Second docking block; 6. Bucket cover; 7. Rubber plug; 8. Screw; 9. Connecting plate; 10. Second pressure gasket; 11. Exhaust port; 12. Filter plate. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] See also Figures 1 to 5 The utility model provides a technical solution: a device for improving the stability of compaction test, comprising a base 1, a baffle 2 being slidably connected to one end of the outer wall of the base 1, a first pressure gasket 3 being threadedly connected to the inner wall of the notch at the axis of the base 1, a bucket-shaped mold 4 being plugged into and connected to the top of the base 1, a limiting component 5 being installed inside the base 1, the bucket-shaped mold 4 being plugged into and connected to the base 1 through the limiting component 5, a bucket cover 6 being threadedly connected to the top of the bucket-shaped mold 4, a rubber plug 7 being plugged into and connected to the inside of the bucket cover 6, a screw 8 being passed through and threadedly connected to the top of the rubber plug 7, the screw 8 being rotatably connected to a connecting disk 9 at the shaft head below, and a second pressure gasket 10 being threadedly connected to the bottom of the connecting disk 9.

[0024] The limiting assembly 5 includes a limiting plug 501 and an external pull rod 502. The limiting plugs 501 are symmetrically distributed and are respectively located in the cavities set at the two ends inside the base 1. The tops of the limiting plugs 501 are glued to the external pull rods 502. The external pull rods 502 are symmetrically distributed and are respectively slidably connected to the slide grooves at the two ends of the top of the base 1. The surfaces of the two external pull rods 502 are respectively rotatably connected to the first docking block 503 and the second docking block 504, and the first docking block 503 and the second docking block 504 are snap-connected.

[0025] In this embodiment, Figure 1 As shown, the baffle 2 is an arc-shaped curved surface, and the baffle 2 is distributed above the bucket cover 6 in an inclined shape as a whole; the structural form of the baffle 2 can cover the feeding port over a larger area, and prevent the powder from accidentally flying out of the feeding port as much as possible. Its inclined structure with one end higher than the other end provides convenience for personnel to feed, and provides a visual reference point, allowing operators to more easily judge the flow of powder and the progress of feeding.

[0026] In this embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, a groove for plugging and connecting the rubber plug 7 is provided on one side of the outer wall of the base 1, and several groups of support columns that fit the bottom of the first pressure gasket 3 are provided at the axis center of the base 1, and an exhaust port 11 is provided on one side of the outer wall of the base 1. At the same time, the exhaust port 11 is connected to the cavity where the first pressure gasket 3 is located, and the exhaust port 11 is located on the outer wall of the pipe outside the base 1 and is threadedly connected to a filter disk 12; the structure on one side of the outer wall of the base 1 for placing the rubber plug 7 effectively avoids the possibility of split parts being lost, and by setting two groups of gasket structures, the first pressure gasket 3 serves as a powder support carrier, and the second pressure gasket 10 evenly transfers pressure to the powder to achieve uniform compaction, and the structure of several support columns below the first pressure gasket 3 The structure provides stable support to ensure that the first pressure gasket 3 remains stable, so that the powder can be evenly pressurized, thereby improving the uniformity of the compaction density. During the powder compaction process, there is air between the powder particles and between the powder and the inner wall of the bucket mold 4. As the second pressure gasket 10 above applies pressure, the pressure gradually increases. These air need to have a discharge channel, and the exhaust port 11 can discharge the air, making the contact between the powder particles closer and achieving a higher compaction density. At the same time, the external filter disc 12 adopts a polytetrafluoroethylene membrane, which has good air permeability and can prevent dust from overflowing, which not only keeps the operating area clean and reduces material waste, but also reduces potential hazards to the health of operators.

[0027] In this embodiment, Figure 2 and Figure 3 As shown, the upper parts of the bucket-shaped mold 4 and the bucket cover 6 are both wide at the top and narrow at the bottom, and the lower part of the bucket-shaped mold 4 is cylindrical, and the bottom of the cylindrical shape is through-shaped, and the first pressure gasket 3 is attached to the cylindrical inner wall of the lower part of the bucket-shaped mold 4; the structural form of the bucket-shaped mold 4 and the bucket cover 6 allows the operator to operate more calmly when pouring powder, reducing the possibility of accidental scattering of powder due to narrow operating space. Compared with the traditional circular hole mold with a smaller inner diameter, this design provides a wider channel for pouring powder, reducing The chance of powder colliding with the edge of the mold is reduced, thereby effectively reducing the risk of powder flying and spilling. First, the outer wall of the bucket cover 6 is threadedly connected to the inner wall of the bucket-shaped mold 4. Secondly, when the two are connected, the bottom of the bucket cover 6 fits tightly against the top of the cylindrical structure of the bucket-shaped mold 4 and forms a through channel. This connection method can achieve a tight fit and effectively prevent powder leakage and overflow during the compaction process. At the same time, the detachable structure makes it easier to clean the entire mold. Its structure higher than the bucket-shaped mold 4 also provides convenience for operators to load and unload.

[0028] In this embodiment, Figure 3 and Figure 5As shown, the surfaces of the first pressure gasket 3 and the second pressure gasket 10 are both provided with a fine grid structure. When the powder is subjected to pressure, the fine pores of the grid can block the flow of the powder and prevent the powder from falling from the gap between the two sets of gaskets, thereby ensuring the stability of the position of the powder during the compaction process and reducing the loss of material. The fine grid structure allows gas to pass through while blocking the powder, providing a channel for air to be discharged.

[0029] In this embodiment, Figure 4 As shown, a ring-shaped notch for plugging and connecting the bucket-shaped mold 4 is provided at the axis center of the top of the base 1, and one end of the limiting plug 501 passes through the notch and is plugged and connected with the notch corresponding to the bucket-shaped mold 4, and the other end of the limiting plug 501 is movably connected to the cavity of the base 1 through a spring. At the same time, the limiting plugs 501 are elastically reset by an external pull rod 502, and relative movement is formed between the limiting plugs 501; the first pressure gasket 3 is used as a carrier, and the second pressure gasket 10 is used to apply pressure. After the powder is compacted between the two, it is necessary to use external detection equipment. In order not to destroy the compacted powder, the bucket-shaped mold 4 is sleeved on the outside of the first pressure gasket 3 through a plug-in structure, providing a protective shell for the powder, ensuring that the integrity of the powder is maintained during external testing, and the elastic structure of the limiting plug 501 can achieve rapid installation and disassembly. Once a test is completed, the internal experimental sample can be taken out by disassembling the bucket-shaped mold 4. This rapid disassembly and installation process greatly improves operating efficiency and reduces operating time and labor intensity.

[0030] In this embodiment, Figure 5 As shown, the rubber plug 7 is plugged into the groove at the axis of the bucket cover 6, and the second pressure gasket 10 forms a lifting structure through the screw 8, and the second pressure gasket 10 is attached to and slidably connected to the cylindrical inner wall below the bucket mold 4; the pressure structure and the sealing structure are integrated together, and the descent of the second pressure gasket 10 is controlled by rotating the screw 8. The operator can gradually increase or decrease the pressure as needed to achieve the best compaction effect. The plug-in structure of the rubber plug 7 and the bucket cover 6 can form a good seal, which effectively prevents the overflow of powder during the compaction process and ensures that the compaction process is carried out in a relatively closed space.

[0031] The use method and advantages of the utility model: When the device for improving the stability of compaction testing is used, the working process is as follows:

[0032] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, first, the bucket cover 6 is threadedly connected to the inner wall of the bucket-shaped mold 4. The bottom of the bucket cover 6 connected by the threaded structure will fit above the cylindrical structure of the bucket-shaped mold 4. A certain amount of powder is taken according to the detection needs, and its density in the uncompacted state is measured with the help of external detection equipment. The baffle 2 is moved to the top of the bucket cover 6, and the operator feeds the material to the bucket cover 6 from the higher end of the baffle 2. Due to the structural form of the bucket cover 6 and the fact that the bucket-shaped mold 4 and the bucket cover 6 are made of quenched stainless steel, the flow speed of the powder is effectively improved. The powder will flow into the cylindrical cavity of the bucket-shaped mold 4 at the place where the size of the neck of the bucket cover 6 gradually decreases and fall on the first pressure gasket 3. When all the desired powder in the bucket cover 6 has entered the bucket-shaped mold 4, the baffle 2 is removed, and the rubber plug 7 on the outer wall side of the base 1 is taken out, inserted into the axis of the bucket cover 6, and the screw is turned. The rod 8 and the connecting plate 9 drive the second pressure gasket 10 to descend and slide on the inner wall of the bucket-shaped mold 4 and apply pressure to the powder. During the continuous pressure application process, the gap between the powder particles gradually decreases. As the pressure increases, the powder particles are tightly squeezed together, and the excess air will pass through the cavity below the first pressure gasket 3 and be discharged from the exhaust port 11. The density of the compacted powder can be detected by non-contact detection with the help of external detection equipment such as X-ray detection equipment, or by disassembling the bucket-shaped mold 4, or using a micrometer for detection. When disassembling the bucket-shaped mold 4, the first docking block 503 is separated from the second docking block 504. After losing the fixation of the locking structure, the limit plug 501 is reset under the elastic structure and correspondingly separated from the notches on both sides of the bucket-shaped mold 4, so that the operator can directly pull out the bucket-shaped mold 4.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Persons skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for improving the stability of a compaction test, comprising a base (1), characterized in that: One end of the outer wall of the base (1) is slidably connected to a baffle (2), the inner wall of the notch at the axis of the base (1) is threadedly connected to a first pressure gasket (3), the top of the base (1) is plugged and connected to a bucket-shaped mold (4), a limiting component (5) is installed inside the base (1), the bucket-shaped mold (4) is plugged and connected to the base (1) through the limiting component (5), the top of the bucket-shaped mold (4) is threadedly connected to a bucket cover (6), the inside of the bucket cover (6) is plugged and connected to a rubber plug (7), the top of the rubber plug (7) is penetrated and threadedly connected to a screw (8), the screw (8) is rotatably connected to a connecting disk (9) at the shaft head below, and the bottom of the connecting disk (9) is threadedly connected to a second pressure gasket (10); The limiting assembly (5) includes a limiting plug (501) and an external pull rod (502), the limiting plugs (501) are symmetrically distributed and respectively located in cavities provided at both ends inside the base (1), the tops of the limiting plugs (501) are glued and connected to the external pull rods (502), the external pull rods (502) are symmetrically distributed and respectively slidably connected to the sliding grooves at both ends of the top of the base (1), the surfaces of the two external pull rods (502) are respectively rotatably connected to the first docking block (503) and the second docking block (504), and the first docking block (503) and the second docking block (504) are snap-fitted.

2. The device for improving compaction test stability according to claim 1, characterized in that: The baffle (2) is in the shape of an arc-shaped curved surface, and the baffle (2) is distributed above the bucket cover (6) in an inclined shape as a whole.

3. The device for improving compaction test stability according to claim 1, characterized in that: A groove for inserting and connecting the rubber plug (7) is provided on one side of the outer wall of the base (1), and a plurality of groups of support columns are provided at the axis of the base (1) to fit the bottom of the first pressure gasket (3). An exhaust port (11) is provided on one side of the outer wall of the base (1), and the exhaust port (11) is connected to the cavity where the first pressure gasket (3) is located. The exhaust port (11) is located on the outer wall of the pipe mouth outside the base (1) and is threadedly connected to a filter disc (12).

4. The device for improving compaction test stability according to claim 1, characterized in that: The tops of the bucket-shaped mold (4) and the bucket cover (6) are both wide at the top and narrow at the bottom, and the bottom of the bucket-shaped mold (4) is cylindrical, and the bottom of the cylindrical shape is through-shaped. At the same time, the first pressure gasket (3) is attached to the cylindrical inner wall of the bottom of the bucket-shaped mold (4).

5. The device for improving compaction test stability according to claim 1, characterized in that: The surfaces of the first pressure gasket (3) and the second pressure gasket (10) are both provided with fine grid-like structures.

6. The device for improving compaction test stability according to claim 1, characterized in that: A ring-shaped notch for plugging and connecting the bucket-shaped mold (4) is provided at the axis center of the top of the base (1), and one end of the limiting plug (501) passes through the notch and is plugged and connected with the notch corresponding to the bucket-shaped mold (4), and the other end of the limiting plug (501) is movably connected to the cavity of the base (1) through a spring, and at the same time, the limiting plug (501) forms an elastic reset structure through an external pull rod (502), and the limiting plugs (501) form relative movement with each other.

7. The device for improving compaction test stability according to claim 1, characterized in that: The rubber plug (7) is plugged into the notch at the axis of the bucket cover (6), and the second pressure gasket (10) forms a lifting structure through the screw (8), and the second pressure gasket (10) is attached to and slidably connected to the cylindrical inner wall below the bucket mold (4).

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