Powder mechanics property testing device

Abstract

The utility model discloses a kind of powder mechanics characteristic testing device, include: compression module, first detection module, shear module and second detection module;Compression module is used to compress the powder to be tested;First detection module is connected with compression module, for measuring the stress of powder when compression module compresses powder;Shear module is adjacently arranged with compression module, for shearing the powder compressed by compression module;Second detection module is linked with shear module, for measuring the shear force when shear module shears powder.The utility model is adjacent to the linking structure of compression module and shear module, realize the in-situ continuous test of powder from compression to shear, avoid the structural damage caused by transfer;Base plate groove and barrel inner diameter matching design completely eliminate sidewall friction interference, ensure that shear force data reflects the real mechanics characteristic of powder;The direct measurement of third detection module to the stress of base plate further verifies the reliability of shear data.

Description

Technical Field

[0001] This utility model relates to the technical field of powder friction testing, and in particular to a powder mechanical property testing device. Background Technology

[0002] Currently, the measurement of powder mechanical properties, such as frictional properties (friction coefficient) and adhesion (adhesion force), mainly relies on shear testing devices. However, existing technologies have the following inherent drawbacks: During the shearing process, the powder remains in continuous contact with the container wall, and the frictional and adhesive forces between the powder and the wall significantly interfere with the measurement of the actual shear force between the powder particles, leading to data distortion. Most devices require transferring the pre-compressed powder to the shearing unit, a process that easily disrupts the consistency of the powder structure (such as changes in density and particle segregation), affecting the repeatability of the results. Utility Model Content

[0003] According to an embodiment of the present invention, a powder mechanical property testing device is provided, comprising:

[0004] Compression module, used to compress the powder to be tested;

[0005] The first detection module is connected to the compression module and is used to measure the force on the powder when the compression module compresses the powder.

[0006] The shearing module is arranged adjacent to the compression module. The shearing module is used to shear the powder compressed by the compression module.

[0007] The second detection module is connected to the shearing module and is used to measure the shearing force when the shearing module shears the powder.

[0008] Furthermore, the compression module includes:

[0009] First power unit;

[0010] The pressure rod has one end connected to the output end of the first power unit, and the first power unit drives the pressure rod to press down.

[0011] The cylinder is connected to the pressure rod. The inside of the cylinder is used to hold the powder to be tested, and the pressure rod presses down along the cylinder to compress the powder.

[0012] Furthermore, the first detection module is a load force measuring instrument.

[0013] Furthermore, the cutting module includes:

[0014] A substrate, on which a groove with a diameter equal to the inner diameter of the cylinder is formed;

[0015] The groove connects to the cylinder, and some of the powder inside the cylinder passes through the cylinder to the groove;

[0016] The second power unit is arranged adjacent to the substrate. When the output end of the power unit is activated, it pushes the substrate to move relative to the cylinder.

[0017] Furthermore, the second detection module is a load cell, which is located between the base plate and the second power unit.

[0018] Furthermore, it also includes a thickness detection module, which is used to detect the thickness of the compressed powder.

[0019] Furthermore, the thickness detection module includes a displacement sensor and a reflector. The displacement sensor is arranged adjacent to the first power unit. One end of the reflector is connected to the top of the pressure rod, and the reflector and the pressure rod are perpendicular to each other. The signal emitted by the displacement sensor is reflected by the reflector.

[0020] Furthermore, it also includes: a powder receiving plate, which is disposed below the substrate and is used to collect powder falling from the substrate.

[0021] Furthermore, it also includes a third detection module, which is located below the substrate and is used to measure the force acting directly on the substrate.

[0022] According to the powder mechanical property testing device of this utility model embodiment, the adjacent connection structure of the compression module and the shear module enables in-situ continuous testing of powder from compression to shear, avoiding structural damage caused by transfer; the first detection module monitors the compression force in real time, and the thickness detection module accurately obtains the powder thickness after compression, while the second detection module simultaneously measures the powder shear force in the groove. The three work together to construct a complete mechanical model of powder compressive stress-density-shear strength; the matching design of the substrate groove and the inner diameter of the cylinder completely eliminates the interference of sidewall friction, ensuring that the shear force data reflects the true mechanical properties of the powder; the direct measurement of the force on the substrate by the third detection module further verifies the reliability of the shear data.

[0023] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the powder mechanical property testing device according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the assembly of the pressure bar, cylinder and substrate of the powder mechanical property testing device according to an embodiment of the present invention;

[0026] Figure 3This is a schematic diagram of the shear separation of powder in the groove and powder in the cylinder of the powder mechanical property testing device according to an embodiment of the present invention. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0028] First, combine Figures 1-3 The powder mechanical property testing device according to the embodiments of the present invention has a wide range of applications.

[0029] like Figure 1 As shown, the powder mechanical property testing device of this utility model includes: a compression module 1, a first detection module 2, a shear module 3, and a second detection module 4.

[0030] Specifically, such as Figure 1 As shown, compression module 1 is used to compress the powder to be tested; first detection module 2 is connected to compression module 1 and is used to measure the force on the powder when compression module 1 compresses the powder; shearing module 3 is arranged adjacent to compression module 1 and is used to shear the powder compressed by compression module 1. The powder can directly enter the shear test from the compressed state without transfer, avoiding structural damage caused by transfer. Second detection module 4 is connected to shearing module 3 and is used to measure the shear force when shearing module 3 shears the powder.

[0031] Furthermore, such as Figures 1-3 As shown, the compression module 1 includes: a first power unit 11, a pressure rod 12, and a cylinder 13; one end of the pressure rod 12 is connected to the output end of the first power unit 11, and the first power unit 11 drives the pressure rod 12 to press down; the cylinder 13 is sleeved with the pressure rod 12, and the inside of the cylinder 13 is used to place the powder to be tested, and the pressure rod 12 presses down along the cylinder 13 to compress the powder. In this embodiment, the first power unit 11 is a servo motor; the cylinder 13 is fixed to an external frame by a connecting rod (not shown in the figure) during use.

[0032] Furthermore, the first detection module 2 is a load force measuring instrument.

[0033] Furthermore, such as Figure 1 , 2As shown, the shearing module 3 includes: a substrate 31 and a second power unit 32; a groove 311 with the same diameter as the inner diameter of the cylinder 13 is formed on the substrate 31; the groove 311 is connected to the cylinder 13, and part of the powder inside the cylinder 13 passes through the cylinder 13 to the groove 311; the second power unit 32 is arranged adjacent to the substrate 31, and the output end of the power unit is activated to push the substrate 31 to move relative to the cylinder 13. In this embodiment, the second power unit 32 is a servo motor. The shearing process only occurs inside the powder, that is, between the powder in the groove 311 and the powder in the cylinder 13, completely avoiding frictional interference between the powder and the side wall of the container.

[0034] In this embodiment, there is another type of substrate 31 that has no grooves 311 on its surface. This type of substrate 31 is used to measure the friction coefficient of powder. When the first power unit 11 compresses the powder, the second power unit pushes the substrate 31 to move, so that the surfaces of the compressed powder and the substrate 31 that are in contact with each other move relative to each other, thereby measuring the friction coefficient of the powder.

[0035] Furthermore, such as Figure 1 As shown, the second detection module 4 is a load cell, which is located between the base plate 31 and the second power unit 32.

[0036] Furthermore, such as Figure 1 As shown, it also includes a thickness detection module 5, which is used to detect the thickness of the compressed powder. The thickness detection module 5 includes a displacement sensor 51 and a reflector 52. The displacement sensor 51 is mounted on the first power unit 11; one end of the reflector 52 is connected to the top of the pressure rod 12, and the reflector 52 and the pressure rod 12 are perpendicular to each other; the signal emitted by the displacement sensor 51 is reflected by the reflector 52. In this embodiment, the displacement sensor 51 is a laser positioner, which can measure the thickness of the compressed powder and know the degree of compression of the powder.

[0037] Furthermore, such as Figure 1 As shown, it also includes: a powder receiving plate 6, which is disposed below the substrate 31. The powder receiving plate 6 is used to collect powder falling from the substrate 31. The powder receiving plate 6 directly captures the powder scattered during the shearing process, thus avoiding contamination of the equipment.

[0038] Furthermore, such as Figure 1 As shown, it also includes a third detection module 7, which is located below the substrate 31. The third detection module 7 is used to measure the force acting directly on the substrate 31. In this embodiment, the third detection module 7 is a load sensor that directly measures the force acting on the substrate 31 and cross-validates the shear force data of the second detection module 4 to prevent data deviation caused by substrate deformation or assembly errors.

[0039] During the powder friction test, powder is placed inside the cylinder 13. Since the cylinder 13 corresponds to the groove 311 on the substrate 31, the powder inside the cylinder 13 enters the groove 311. Then, the pressure rod 12 is placed inside the cylinder 13, and the first power unit 11 is activated. The first power unit 11 presses the pressure rod 12 downwards, compressing the powder inside the cylinder 13. Then, the second power unit 32 is activated, pushing the substrate 31, causing the compressed powder in the groove 311 to shear and separate from the powder in the cylinder 13. The force during powder shearing is measured by the second detection module 4. If the substrate 31 is replaced with one without the groove 311, it can be used to measure the coefficient of friction.

[0040] Above, refer to Figures 1-3 This invention describes a powder mechanical property testing device according to an embodiment of the present invention. Through the adjacent connection structure of the compression module 1 and the shear module 3, in-situ continuous testing of powder from compression to shearing is achieved, avoiding structural damage caused by transfer. The first detection module 2 monitors the compression force in real time, and the thickness detection module 5 accurately obtains the powder thickness after compression. Simultaneously, the second detection module 4 measures the powder shear force within the groove 311. These three components work together to construct a complete mechanical model of powder compressive stress-density-shear strength. The matching design of the groove 311 of the substrate 31 with the inner diameter of the cylinder 13 completely eliminates sidewall friction interference, ensuring that the shear force data reflects the true mechanical properties of the powder. The direct measurement of the force on the substrate 31 by the third detection module 7 further verifies the reliability of the shear data.

[0041] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes that element.

[0042] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A powder mechanical property testing device, characterized in that, Include: A compression module, used to compress the powder to be tested; A first detection module is connected to the compression module and is used to measure the force on the powder when the compression module compresses the powder. A shearing module is arranged adjacent to the compression module, and the shearing module is used to shear the powder compressed by the compression module; The second detection module is connected to the shearing module and is used to measure the shearing force when the shearing module shears the powder.

2. The powder mechanical property testing device as described in claim 1, characterized in that, The compression module includes: First power unit; A pressure rod, one end of which is connected to the output end of the first power unit, and the first power unit drives the pressure rod to press down; A cylindrical body is sleeved with the pressure rod. The inside of the cylindrical body is used to place the powder to be tested, and the pressure rod presses down along the cylindrical body to compress the powder.

3. The powder mechanical property testing device as described in claim 1, characterized in that, The first detection module is a load force measuring instrument.

4. The powder mechanical property testing device as described in claim 2, characterized in that, The cutting module includes: A substrate, wherein a groove with a diameter equal to the inner diameter of the cylinder is formed on the substrate; The groove is connected to the cylinder, and some of the powder inside the cylinder passes through the cylinder to the groove; The second power unit is arranged adjacent to the substrate. When the output end of the power unit is activated, it pushes the substrate to move relative to the cylinder.

5. The powder mechanical property testing device as described in claim 4, characterized in that, The second detection module is a load cell, which is located between the base plate and the second power unit.

6. The powder mechanical property testing device as described in claim 1, characterized in that, It also includes: a thickness detection module, which is used to detect the thickness of the compressed powder.

7. The powder mechanical property testing device as described in claim 6, characterized in that, The thickness detection module includes a displacement sensor and a reflector. The displacement sensor is arranged adjacent to the first power unit. One end of the reflector is connected to the top of the pressure rod, and the reflector is perpendicular to the pressure rod. The displacement sensor emits a signal that is reflected by the reflector.

8. The powder mechanical property testing device as described in claim 4, characterized in that, It also includes: a powder receiving plate disposed below the substrate, the powder receiving plate being used to collect powder falling from the substrate.

9. The powder mechanical property testing device as described in claim 4, characterized in that, It also includes: a third detection module, which is located below the substrate and is used to measure the force acting directly on the substrate.

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