Internal friction test bed for energetic particles

Abstract

The utility model belongs to the technical field of particle friction, and particularly relates to an energetic particle internal friction test bed, which comprises a workbench box body and a workbench plate arranged on the surface of the workbench box body, and further comprises an energy-containing particle internal friction test bed, a shearing box body is installed on the surface of the working table plate through a shearing box base, a sandwich structure is slidably connected to the surface of the shearing box body, a film sensor is arranged on the inner side of the sandwich structure, vertical positioning platforms are arranged on the two sides of the shearing box body, and the vertical positioning platforms are installed on the surface of the working table plate. A weighing sensor is mounted on the surface of the vertical positioning platform; the time history of the normal force and the tangential force of the inner shearing unit can be measured at the same time so as to research the friction behavior of particles in the linear reciprocating sliding process.

Description

Technical Field

[0001] This utility model belongs to the field of particle friction technology, specifically relating to an internal friction test bench for energetic particles. Background Technology

[0002] Particle friction is crucial for the ubiquitous accumulation and flow phenomena in nature and industrial production, such as geological faulting, powder mixing and densification, and particle flow lubrication. The coefficient of friction (COF) is expressed as the tangential friction force divided by the total normal force and is usually used to describe the shear strength of particle systems. Currently, particle friction research is mainly related to two experimental schemes: the surface sliding scheme, in which shear elements slide along the surface of the particle system, and the internal sliding scheme, in which shear elements slide inside the particle system.

[0003] To date, the surface sliding scheme has been widely used in particle friction research due to its simplicity. Compared with the fixed normal load in the surface sliding scheme, the normal force acting on the internal sliding shear unit is usually dynamic due to the evolution of the force chain network. Shear motion can cause the continuous collapse and reconstruction of the force chain, resulting in dynamic changes in the force transmission path and load-bearing capacity. The internal sliding scheme can help reveal the influence of the force chain network on particle friction. However, the unknown dynamic normal force in the internal sliding scheme is difficult to measure.

[0004] Therefore, an internal friction test rig for energetic particles was designed. Utility Model Content

[0005] To address the problems mentioned in the background art, this invention provides an internal friction test bench for energetic particles, which can simultaneously measure the time history of the normal and tangential forces in the internal shear unit to study the frictional behavior of particles during linear reciprocating sliding.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an energetic particle internal friction test bench, including a workbench housing and a workbench plate disposed on the surface of the workbench housing, and further including: a shear box body is mounted on the surface of the workbench plate via a shear box base, a sandwich structure is slidably connected to the surface of the shear box body, and a thin film sensor is disposed on the inner side of the sandwich structure.

[0007] As a preferred embodiment of the energetic particle internal friction test bench of this utility model, vertical positioning platforms are provided on both sides of the shear box body. The vertical positioning platforms are installed on the surface of the workbench, and weighing sensors are installed on the surface of the vertical positioning platforms.

[0008] As a preferred embodiment of the energetic particle internal friction test bench of this utility model, the sandwich structure consists of two stainless steel clamping plates, and the thin film sensor is installed and fixed between the two clamping plates.

[0009] As a preferred embodiment of the energetic particle internal friction test bench of this utility model, the surface of the shear box body is provided with a top plate for applying weights.

[0010] As a preferred embodiment of the energetic particle internal friction test bench of this utility model, a detection box is provided on one side of the shear box body. The detection box is installed on the surface of the workbench plate. An S-shaped sensor is provided on the inner side of the detection box. The S-shaped sensor is connected to the sandwich structure through a floating pin and a floating plate.

[0011] As a preferred embodiment of the energetic particle internal friction test bench of this utility model, the S-shaped sensor is connected to an L-shaped transmission plate on the side away from the sandwich structure, and the surface of the workbench plate is provided with a movable groove for the movement of the L-shaped transmission plate, and the other end of the L-shaped transmission plate extends to the inner side of the workbench box.

[0012] As a preferred embodiment of the energetic particle internal friction test bench of this utility model, an electric cylinder is installed on the inner side of the workbench housing via a cylinder seat. The output shaft of the electric cylinder is connected to a servo motor via a transmission component. A moving plate is installed on the surface of the electric cylinder, and the L-shaped transmission plate is fixedly connected to the moving plate.

[0013] As a preferred embodiment of the energetic particle internal friction test bench of this utility model, a displacement sensor is provided on the side of the electric cylinder away from the servo motor. The displacement sensor is mounted on the inner bottom surface of the workbench housing via a mounting bracket, and the extension shaft of the displacement sensor is connected to the L-shaped transmission plate via a connecting bracket.

[0014] Compared with existing technologies, the advantages of this invention are: it employs a customized experimental setup to overcome the shortcomings of current internal sliding schemes and to study the frictional characteristics of particulate matter. Typically, the forces between particles within a particulate matter framework include normal contact, shear contact, capillary action, cohesion, and van der Waals forces. For the dry sliding process using millimeter-scale particles, only normal contact forces and shear contact forces are relevant. The experimental setup can simultaneously measure the normal load and tangential frictional force acting on the shear unit, thus providing the time history of the shear process and qualitatively reflecting the evolution of the force chain at the mesoscale. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

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

[0017] Figure 2This is a schematic diagram of the structure of the shear box body in this utility model;

[0018] Figure 3 This is a schematic diagram of the S-type sensor in this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the weighing sensor in this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the electric cylinder in this utility model;

[0021] Figure 6 This is a schematic diagram of the displacement sensor in this utility model;

[0022] In the picture:

[0023] 1. Workbench housing; 11. Workbench plate; 12. Movable groove; 2. Shearing box body; 21. Shearing box base; 22. Vertical positioning platform; 23. Top plate; 24. Weight; 25. Weighing sensor; 3. Sandwich structure; 4. Floating pin; 41. Floating plate; 5. Detection box; 51. S-type sensor; 52. L-type transmission plate; 6. Electric cylinder; 61. Servo motor; 62. Transmission component; 63. Moving plate; 64. Cylinder seat; 7. Displacement sensor; 71. Connecting frame; 72. Mounting frame. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] like Figure 1 As shown;

[0027] An energetic particle internal friction test bench includes a workbench housing 1 and a workbench plate 11 disposed on the surface of the workbench housing 1.

[0028] In this implementation scheme: the internal sliding scheme can help reveal the influence of the force chain network on particle friction. However, the unknown dynamic normal force in the internal sliding scheme is difficult to measure. To solve this technical problem, a shear box body 2 and a sandwich structure 3 are added on this basis.

[0029] Furthermore:

[0030] like Figures 1 to 6 As shown:

[0031] In conjunction with the above, it also includes: a shear box body 2 is mounted on the surface of the workbench 11 via a shear box base 21, a sandwich structure 3 is slidably connected to the surface of the shear box body 2, and a thin film sensor is provided on the inner side of the sandwich structure 3.

[0032] In this implementation plan: the test bench includes a workbench box 1 and a workbench plate 11 set on its surface, which is the basic structural part of the test bench. The operator can fill the test powder into the shear box body 2, fill it and flatten it, and insert the sandwich structure 3 into the powder through the side holes at both ends of the shear box body 2.

[0033] It should be noted that the shear box body 2 is made of 45# steel, welded together, with a wall thickness of approximately 10mm. Its internal dimensions (length * width * height) are 100 * 100 * 80mm. The shear box base 21 has diamond-shaped and round pins at the bottom for quick tooling changes. The shear box body 2 is sealed on both sides to prevent powder leakage during the reciprocating motion of the core structure 3. In practice, the number of particles in the designated container should be sufficiently large, and the particles should not slide out of the container from the side holes. Considering these factors, approximately six 10SiOb4alls2 particles, with a diameter ranging from 2.0 to 2.5mm and a total mass of 1kg, are used as particles to fill the shear box body 2.

[0034] Furthermore:

[0035] In an optional embodiment, vertical positioning platforms 22 are provided on both sides of the shear box body 2. The vertical positioning platforms 22 are mounted on the surface of the workbench 11, and weighing sensors 25 are mounted on the surface of the vertical positioning platforms 22.

[0036] In this embodiment: Vertical positioning platforms 22 equipped with weighing sensors 25 are placed on both sides of the shear box body 2 to adjust the gap between the sandwich structure 3 and the two holes of the shear box body 2.

[0037] Furthermore:

[0038] In an optional embodiment, the sandwich structure 3 consists of two 304 stainless steel plates, with the thin-film sensor mounted and fixed between the two plates.

[0039] In this embodiment: two thin-film load sensors (sensor A and B) are sandwiched between the upper and lower clamping plates to form a core sandwich structure 3 with dimensions of 200mm×20mm×4mm.

[0040] It should be noted that the upper and lower clamping plates are made of 304 stainless steel with a thickness of 1.5mm. Six sensors are deployed around the sandwich structure 3, including two thin-film force sensors (TeKscan, USA) with a measurement range of 0-5N and an accuracy of 0.02N, three capacitive cantilever beam force sensors (HBM, Germany) with a measurement range of 0-20N and an accuracy of 0.005N, and one linear variable differential transformer (LVDT) displacement sensor (RDP Group, UK) with a measurement range of 0-25mm and an accuracy of 0.025mm. Thin-film force sensors A and B measure the normal load on the sandwich structure 3. The center distance between the two sensors is set to d = 30mm. The position and time history of the two thin-film force sensors during the reciprocating sliding process are obtained using the displacement sensor. The frictional force on the sandwich structure 3 is measured using the cantilever beam force sensor mounted on the upper left end of the reciprocating unit. Force sensors C and D of the cantilever beam are fixed at the upper ends of two vertical displacement platforms to measure the normal force Fdchh (FFF) on the sandwich structure 3 when contact occurs.

[0041] Furthermore:

[0042] In an optional embodiment, the surface of the shear box body 2 is provided with a top plate 23 for applying weights 24.

[0043] In this embodiment: the top plate 23 of the shear box body 2 is closed, and a rated weight 24 is applied to the top plate 23 in the normal direction.

[0044] Furthermore:

[0045] In an optional embodiment, a detection box 5 is provided on one side of the shear box body 2. The detection box 5 is installed on the surface of the workbench 11. An S-type sensor 51 is provided on the inner side of the detection box 5. The S-type sensor 51 is connected to the sandwich structure 3 through a floating pin 4 and a floating plate 41.

[0046] In this embodiment: one end of the sandwich structure 3 is connected to the floating pin 4 and the floating plate 41, and the S-type sensor 51 is connected to the floating pin 4. The horizontal friction force data of the sandwich structure 3 is collected through the S-type sensor 51.

[0047] It should be noted that the sliding of the core structure 3 is achieved by using a floating pin 4 to drive it. The floating pin 4 meets the following requirements: (A) The upper and lower clamping plates of the core structure 3 slide synchronously horizontally, avoiding relative movement with the sensor. (B) The upper and lower clamping plates are not subjected to any additional normal force from the clamps. (C) The experimental setup can be assembled, the position of the core structure 3 can be easily adjusted, and the S-type sensor 51 is an HBM brand tension / compression sensor.

[0048] Furthermore:

[0049] In an optional embodiment, the side of the S-shaped sensor 51 away from the sandwich structure 3 is connected to an L-shaped transmission plate 52, and the surface of the worktable 11 is provided with a movable groove 12 for the movement of the L-shaped transmission plate 52. The other end of the L-shaped transmission plate 52 extends to the inside of the worktable box 1.

[0050] In this embodiment, the movable groove 12 provides space for the movement of the L-shaped transmission plate 52, ensuring that it can move freely and thus accurately transmit force change information.

[0051] Furthermore:

[0052] In an optional embodiment, an electric cylinder 6 is mounted on the inner side of the workbench housing 1 via a cylinder base 64. The output shaft of the electric cylinder 6 is connected to a servo motor 61 via a transmission component 62. A movable plate 63 is mounted on the surface of the electric cylinder 6, and an L-shaped transmission plate 52 is fixedly connected to the movable plate 63.

[0053] In this embodiment: An electric cylinder 6 is installed on the inner side of the workbench housing 1 via a cylinder seat 64. The electric cylinder is the power drive device of the test bench. The output shaft of the electric cylinder 6 is connected to a servo motor 61 via a transmission component 62. The servo motor 61 controls the movement of the electric cylinder 6 to apply and control the force during the test. A movable plate 63 is installed on the surface of the electric cylinder 6. An L-shaped transmission plate 52 is fixedly connected to the movable plate 63. The movement of the electric cylinder 6 drives the movement of the movable plate 63 and the L-shaped transmission plate 52, thereby achieving the driving and control of the test.

[0054] Furthermore:

[0055] In an optional embodiment, a displacement sensor 7 is provided on the side of the electric cylinder 6 away from the servo motor 61. The displacement sensor 7 is mounted on the inner bottom surface of the workbench housing 1 via a mounting bracket 72, and the extension shaft of the displacement sensor 7 is connected to the L-shaped transmission plate 52 via a connecting bracket 71.

[0056] In this embodiment, the extension shaft of the displacement sensor 7 is connected to the L-shaped transmission plate 52 through the connecting frame 71. The displacement of the electric cylinder 6 can be indirectly detected by detecting the displacement of the L-shaped transmission plate 52, thereby realizing accurate measurement and control of the displacement during the test.

[0057] Working principle: The test bench includes a workbench box 1 and a workbench plate 11 on its surface, which is the basic structure of the test bench. The operator can fill the shear box body 2 with test powder, fill it and flatten it, insert the sandwich structure 3 into the powder through the side holes at both ends of the shear box body 2, and place vertical positioning platforms 22 with weighing sensors 25 on both sides of the shear box body 2 to adjust the gap between the sandwich structure 3 and the two holes of the shear box body 2. Two thin film load sensors (sensors A and B) are sandwiched between the upper and lower clamping plates to form a core sandwich structure 3 with a size of 200mm×20mm×4mm. The top plate 23 of the shear box body 2 is closed, and the top plate 23 is normally loaded with a rated weight 24. One end of the sandwich structure 3 is combined with a floating pin 4 and a floating plate 41. An S-type sensor 51 is connected to the floating pin 4. The horizontal friction force on the sandwich structure 3 is realized through the S-type sensor 51. According to the data collection, the movable groove 12 provides space for the movement of the L-shaped transmission plate 52, ensuring that it can move freely and thus accurately transmit force change information. An electric cylinder 6 is installed on the inner side of the workbench box 1 through the cylinder seat 64. The electric cylinder is the power drive device of the test bench. The output shaft of the electric cylinder 6 is connected to the servo motor 61 through the transmission component 62. The servo motor 61 controls the movement of the electric cylinder 6 to realize the application and control of force during the test. A moving plate 63 is installed on the surface of the electric cylinder 6. The L-shaped transmission plate 52 is fixedly connected to the moving plate 63. The movement of the electric cylinder 6 drives the movement of the moving plate 63 and the L-shaped transmission plate 52, thereby realizing the drive and control of the test. The extension shaft of the displacement sensor 7 is connected to the L-shaped transmission plate 52 through the connecting frame 71. The displacement of the electric cylinder 6 can be indirectly detected by detecting the displacement of the L-shaped transmission plate 52, thereby realizing the accurate measurement and control of displacement during the test.

[0058] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A test bench for internal friction of energetic particles, comprising a workbench box (1) and a workbench plate (11) arranged on the surface of the workbench box (1), characterized in that: It also includes: a shear box body (2) is mounted on the surface of the workbench (11) via a shear box base (21), a sandwich structure (3) is slidably connected to the surface of the shear box body (2), and a thin film sensor is provided on the inner side of the sandwich structure (3).

2. The energetic particle internal friction test bench according to claim 1, characterized in that Vertical positioning platforms (22) are provided on both sides of the shear box body (2). The vertical positioning platforms (22) are installed on the surface of the workbench (11), and weighing sensors (25) are installed on the surface of the vertical positioning platforms (22).

3. The intrabedded energetic particle internal friction test stand of claim 1, characterized in that: The sandwich structure (3) consists of two 304 stainless steel plates, and the thin film sensor is installed and fixed between the two plates.

4. The energetic particle internal friction test stand of claim 1, wherein: The surface of the shear box body (2) is provided with a top plate (23) for applying weights (24).

5. The intrabedded energetic particle internal friction test stand of claim 1, wherein: A detection box (5) is provided on one side of the shear box body (2). The detection box (5) is installed on the surface of the workbench (11). An S-type sensor (51) is provided on the inner side of the detection box (5). The S-type sensor (51) is connected to the sandwich structure (3) through a floating pin (4) and a floating plate (41).

6. The energetic particle internal friction test rig of claim 5, characterized in that: The S-shaped sensor (51) is connected to an L-shaped transmission plate (52) on the side away from the sandwich structure (3). The surface of the worktable (11) is provided with a movable groove (12) for the movement of the L-shaped transmission plate (52). The other end of the L-shaped transmission plate (52) extends to the inside of the worktable box (1).

7. The energetic particle internal friction test bench according to claim 6, characterized in that An electric cylinder (6) is installed on the inner side of the workbench housing (1) via a cylinder seat (64). The output shaft of the electric cylinder (6) is connected to a servo motor (61) via a transmission component (62). A moving plate (63) is installed on the surface of the electric cylinder (6). The L-shaped transmission plate (52) is fixedly connected to the moving plate (63).

8. The energetic particle internal friction test stand of claim 7, characterized in that: A displacement sensor (7) is provided on the side of the electric cylinder (6) away from the servo motor (61). The displacement sensor (7) is installed on the inner bottom surface of the workbench housing (1) through a mounting bracket (72). The extension shaft of the displacement sensor (7) is connected to the L-shaped transmission plate (52) through a connecting bracket (71).

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