Image acquisition device and method for testing repose angle of elementary substance energetic material particles

Abstract

The invention discloses an image acquisition device and method for testing the repose angle of a simple substance energetic material particle, and the device comprises a pedestal, one end of the pedestal is provided with a vertical column, the vertical column is provided with a clamping mechanism which can move along the vertical direction, and one end, far away from the vertical column, of the clamping mechanism is provided with a hopper. An anti-explosion metering scale is arranged on the base below the hopper, and a material receiving plate capable of covering a discharge hole of the hopper is arranged on the anti-explosion metering scale; an ultrasonic generator is further arranged on the hopper; the stand column is further provided with an anti-explosion camera, and the image acquisition end of the anti-explosion camera faces the anti-explosion metering scale. According to the method, high-frequency ultrasonic waves are applied in the feeding process by means of an ultrasonic device, energetic material particles are compacted through vibration, and it is guaranteed that the initial state of the energetic material particles is not affected by external factors; the ultrasonic device applies low-frequency ultrasonic waves in the vertical moving process of the clamping mechanism along the stand column, energetic material particles are prevented from bridging, the fluency of the energetic material particles in the falling process is guaranteed, and the collection precision is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of energetic material measurement, relates to a testing device, and specifically to an image acquisition device and method for testing the repose angle of single-substance energetic material particles. Background Art

[0002] Energetic materials used in weapons and equipment are mostly mixed systems, in which single-element energetic materials are the core components. Clarifying the performance of single-element energetic material components is of great significance to improving the quality of finished energetic materials. In the process of preparing energetic materials, the fluidity of single-element energetic materials has an impact on process safety and product quality that cannot be ignored. Among them, the angle of repose involves the stability and fluidity of the material itself, and is an important indicator for evaluating the fluidity and fluidity of the material. For single-element energetic materials, the angle of repose test can also reflect the friction between material particles, which is of great significance for further judging the safety of the processing of single-element energetic materials. However, energetic materials are easy to ignite when impacted, some energetic materials are highly loose, the initial state is greatly affected by the feeding speed, and bridging is easy to occur during the falling process, resulting in large test errors. The existing angle of repose test device is not suitable for single-element energetic materials and is in urgent need of improvement. Summary of the invention

[0003] To solve the above problems, the purpose of the present invention is to provide an image acquisition device and method for testing the angle of repose of particles of a single substance energetic material, so as to solve the technical problem of the lack of a device for testing the angle of repose of a single substance energetic material in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] An image acquisition device for testing the repose angle of single-substance energetic material particles comprises a base, a column is arranged at one end of the base, a clamping mechanism capable of moving vertically is arranged on the column, a hopper is arranged at one end of the clamping mechanism away from the column, and a receiving plate capable of covering a material outlet of the hopper is arranged on the base below the hopper;

[0006] The hopper is also provided with an ultrasonic generator;

[0007] An explosion-proof camera is also provided on the column, and the image acquisition end of the explosion-proof camera faces the material receiving plate and is used to acquire images of the accumulation of particles of single-element energetic material.

[0008] The present invention also has the following technical features:

[0009] Specifically, the base is also provided with an explosion-proof weighing scale for weighing the weight of single-substance energetic material particles, and the receiving plate is arranged on the explosion-proof weighing scale.

[0010] Furthermore, the clamping mechanism includes a sliding block movably arranged on the column, the sliding block is connected to a cross bar, and one end of the cross bar away from the column is connected to the hopper.

[0011] Furthermore, a limit block is arranged at the top end of the column, and the limit block is used to limit the sliding block.

[0012] Furthermore, a driving motor is also arranged on the base, and a power output end of the driving motor is connected to the slider to drive the slider to move up and down along the column.

[0013] Furthermore, the hopper includes a frustum section and a cylindrical section which are integrally connected from top to bottom, and the cylindrical section is equidiametrically connected to the small diameter end of the frustum section, the diameter of the cylindrical section is 50 to 100 mm, the height is 50 to 80 mm, and the taper of the frustum section is 50 to 70°.

[0014] Furthermore, the base and the column are made of nitrided steel, and the hopper and the receiving plate are made of tin bronze plates.

[0015] The present invention also protects a data acquisition method for testing the repose angle of single-substance energetic material particles, which is implemented by the above-mentioned image acquisition device for testing the repose angle of single-substance energetic material particles, and comprises the following steps:

[0016] Step 1, start the driving motor to drive the hopper to move downward, so that the hopper outlet contacts the receiving plate, add energetic granular material into the hopper, start the ultrasonic generator to make the hopper vibrate at high frequency for 1 to 2 minutes, and then let it stand for 10 to 20 minutes;

[0017] Step 2: Start the ultrasonic generator to generate low-frequency ultrasonic waves to make the hopper vibrate at a low frequency;

[0018] Step 3, starting the driving motor to drive the clamping mechanism to move vertically along the column, so that the energetic granular material in the hopper flows freely, and a pile of energetic granular material is formed on the receiving plate;

[0019] Step 4: Collect images of energetic granular material accumulations through an explosion-proof camera.

[0020] Preferably, the frequency of the high-frequency ultrasound in step 1 is 25 to 35 kHz; the frequency of the low-frequency ultrasound in step 2 is 8 to 12 kHz.

[0021] Preferably, in step 3, the speed at which the clamping mechanism moves vertically along the column is 0.01 m / s to 0.05 m / s.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The structural design of the device of the present invention avoids the risk of ignition of energetic material particles after being impacted when falling from a certain height. With the help of the device, the image of the deposited body for measuring the repose angle of the energetic material can be safely and accurately obtained. By performing contour recognition on the collected image, the parameters for calculating the repose angle of the single-element energetic material particles can be obtained, and then the repose angle can be obtained. The device of the present invention has a simple structure and is easy to use, providing technical support for the fluidity test of energetic materials.

[0024] (2) The method of the present invention uses an ultrasonic device. On the one hand, high-frequency ultrasonic waves are applied during the feeding process to compact the energetic material particles, ensuring that the initial state is not affected by external factors and the accuracy of the experiment. On the other hand, low-frequency ultrasonic waves are applied during the vertical movement of the clamping mechanism along the column to prevent the energetic material particles from bridging, ensure the smoothness of the falling process, and improve the collection accuracy.

[0025] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the image acquisition device of the present invention.

[0027] The symbols in the figure represent:

[0028] 1-base, 2-column, 3-clamping mechanism, 4-hopper, 5-explosion-proof weighing scale, 6-receiving plate, 7-ultrasonic generator, 8-explosion-proof camera, 9-limiting block; 31-slider, 32-cross bar; 41-cone segment, 42-cylindrical segment.

[0029] The specific contents of the present invention are further explained in detail below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0031] The terms "upper", "lower", "front", "back", "top", "bottom", etc. used in the present invention to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. "Inside" and "outside" refer to the inside and outside of the contour of the corresponding components, and the above terms should not be understood as limitations on the present invention.

[0032] In the present invention, unless otherwise specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Angle of repose: refers to the angle between loose materials and the horizontal plane when they are piled.

[0034] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art. For example, the columns in the present invention can be existing hydraulic props.

[0035] Example

[0036] Following the above technical solution, Figure 1 As shown, the present invention discloses an image acquisition device for testing the repose angle of single-element energetic material particles, comprising a base 1, a column 2 is arranged at one end of the base 1, and a material receiving plate is made of tin bronze, which plays a role in reducing the ignition probability of energetic materials.

[0037] A clamping mechanism 3 capable of moving vertically is provided on the column 2, a hopper 4 is provided at one end of the clamping mechanism 3 away from the column 2, a receiving plate 6 capable of covering the discharge port of the hopper 4 is provided on the base 1 below the hopper 4, and the hopper and the receiving plate are made of tin bronze, which plays a role in reducing the ignition probability of energetic materials and ensures that no sparks are generated when the energetic material particles collide and rub against the receiving plate 6.

[0038] An ultrasonic generator 7 is also provided on the hopper 4; the ultrasonic generator 7 is used to generate high-frequency ultrasonic waves in the feeding stage, so that the energetic granular materials in the hopper are vibrated and densely accumulated, thereby preventing the energetic granular materials from bridging and agglomerating in the hopper, and improving the safety of the collection process; when the hopper 4 moves vertically upward, low-frequency ultrasonic waves are generated to prevent the energetic granular materials from bridging and agglomerating during the falling process.

[0039] An explosion-proof camera 8 is also provided on the column 2, and the image acquisition end of the explosion-proof camera 8 faces the material receiving plate 6; the explosion-proof camera 8 is used to collect images of the accumulation of energetic granular materials.

[0040] The ultrasonic generator 7 and the explosion-proof camera 8 are both electrically connected to the remote controller, and the remote controller is electrically connected to receive images captured by the explosion-proof camera 8 .

[0041] In this embodiment, the base 1 has a size of 400mm×400mm, the measuring range of the explosion-proof weighing scale 5 is 0~1kg, the receiving plate 6 has a size of 210mm×210mm, the height of the column 2 is 400mm, the inner diameter of the cylindrical section 42 of the hopper 4 is 50mm, the outer diameter is 55mm, and the height is 50mm, and the inclination angle of the frustum section 42 is 60° and the height is 100mm.

[0042] As a preferred solution of this embodiment, an explosion-proof weighing scale 5 for weighing the weight of the single-substance energetic material particles is also provided on the base 1, and the receiving plate 6 is arranged on the explosion-proof weighing scale 5. The bulk density of the single-substance energetic particle material can be calculated by dividing the weighing data collected by the explosion-proof weighing scale 5 by the volume of the single-substance energetic material.

[0043] The clamping mechanism 3 includes a slider 31 movably arranged on the column 2 , a cross bar 32 is connected to the slider 31 , and one end of the cross bar 32 away from the column 2 is connected to the hopper 4 .

[0044] As a preferred solution of this embodiment, a limit block 9 is provided at the top of the column 2 , and the limit block 9 is used to limit the sliding block 31 .

[0045] As a preferred solution of this embodiment, a driving motor is further provided on the base 1 , and a power output end of the driving motor is connected to the slider 31 to drive the slider 31 to move up and down along the column 2 .

[0046] As a preferred solution of this embodiment, the hopper 4 includes a frustum section 41 and a cylindrical section 42 which are integrally connected from top to bottom, and the cylindrical section 42 is connected to the small-diameter end of the frustum section 41 at the same diameter.

[0047] Example 2

[0048] This embodiment uses the image acquisition device for testing the angle of repose of single-substance energetic material particles provided in Example 1 to implement the angle of repose test of RDX particle materials, including the following steps:

[0049] Step 1, start the driving motor to drive the hopper 4 to move downward, so that the discharge port of the hopper 4 abuts against the receiving plate 6, add 50g of RDX to the middle section of the cone section 42 in the hopper 4, start the ultrasonic generator 7 to generate a high-frequency ultrasonic wave of 30kHz, make the hopper 4 vibrate at high frequency for 2 minutes, and then let it stand for 10 minutes;

[0050] Step 2, start the ultrasonic generator 7 to generate 10 Hz low-frequency ultrasonic waves to make the hopper 4 vibrate at a low frequency;

[0051] Step 3, start the driving motor to drive the clamping mechanism 3 to move vertically along the column 2 at a speed of 0.01m / s, so that the RDX particles in the hopper 4 flow freely and form a RDX accumulation body on the receiving plate 6;

[0052] Step 4: The image of the RDX accumulation body is collected by the explosion-proof camera 8, and at the same time, the weighing data of the explosion-proof weighing scale 5 can also be collected.

[0053] By using an existing image recognition program to perform contour recognition on the collected image, the contour curve of the energetic material particle accumulation body can be obtained, and then the maximum height and maximum width of the accumulation body can be obtained. The angle of repose can then be calculated according to angle of repose = arctan [maximum height / (maximum width / 2)], or it can be directly measured with the help of a protractor.

[0054] In this embodiment, the final calculated angle of repose of RDX is 41.3° and the bulk density is 1100 kg / m 3 .

[0055] The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An image acquisition device for testing the repose angle of single-substance energetic material particles, comprising a base (1), a column (2) being arranged at one end of the base (1), a clamping mechanism (3) being arranged on the column (2) and being capable of moving vertically, a hopper (4) being arranged at one end of the clamping mechanism (3) away from the column (2), and a receiving plate (6) being capable of covering a discharge port of the hopper (4) being arranged on the base (1) below the hopper (4); The hopper (4) is also provided with an ultrasonic generator (7); An explosion-proof camera (8) is also provided on the column (2), and the image acquisition end of the explosion-proof camera (8) faces the material receiving plate (6) and is used to acquire an image of a deposit of particles of a single energetic material.

2. The image acquisition device for testing the repose angle of single-substance energetic material particles according to claim 1, characterized in that: The base (1) is also provided with an explosion-proof weighing scale (5) for weighing the weight of particles of a single energetic material, and the receiving plate (6) is arranged on the explosion-proof weighing scale (5).

3. The image acquisition device for testing the angle of repose of particles of a single substance energetic material as described in claim 1, wherein the clamping mechanism (3) comprises a slider (31) movably arranged on the column (2), a cross bar (32) being connected to the slider (31), and an end of the cross bar (32) away from the column (2) being connected to the hopper (4).

4. The image acquisition device for testing the repose angle of single-substance energetic material particles according to claim 1, characterized in that: A limit block (9) is provided at the top end of the column (2), and the limit block (9) is used to limit the position of the sliding block (31).

5. The image acquisition device for testing the repose angle of single-substance energetic material particles according to claim 1, characterized in that: A driving motor is also provided on the base (1), and a power output end of the driving motor is connected to the slider (31) to drive the slider (31) to move up and down along the column (2).

6. The image acquisition device for testing the repose angle of single-substance energetic material particles according to claim 1, characterized in that: The hopper (4) comprises a frustum section (41) and a cylindrical section (42) which are integrally connected from top to bottom, and the cylindrical section (42) is equidiametrically connected to the small-diameter end of the frustum section (41), the cylindrical section (42) has a diameter of 50 to 100 mm, a height of 50 to 80 mm, and a taper of 50 to 70° for the frustum section (41).

7. The image acquisition device for testing the repose angle of single-substance energetic material particles according to claim 1, characterized in that: The base (1) and the column (2) are made of nitrided steel, and the hopper (4) and the receiving plate (6) are made of tin bronze plates.

8. A data acquisition method for testing the angle of repose of single-substance energetic material particles, the method being implemented by an image acquisition device for testing the angle of repose of single-substance energetic material particles according to any one of claims 1 to 7, comprising the following steps: Step 1, start the driving motor to drive the hopper to move downward, so that the hopper outlet contacts the receiving plate, add energetic granular material into the hopper, start the ultrasonic generator to make the hopper vibrate at high frequency for 1 to 2 minutes, and then let it stand for 10 to 20 minutes; Step 2: Start the ultrasonic generator to generate low-frequency ultrasonic waves to make the hopper vibrate at a low frequency; Step 3, starting the driving motor to drive the clamping mechanism to move vertically along the column, so that the energetic granular material in the hopper flows freely, and a pile of energetic granular material is formed on the receiving plate; Step 4: Collect images of energetic granular material accumulations through an explosion-proof camera.

9. The method according to claim 8, characterized in that The frequency of the high-frequency ultrasonic wave described in step 1 is 25 to 35 kHz; the frequency of the low-frequency ultrasonic wave described in step 2 is 8 to 12 kHz.

10. The method according to claim 8, characterized in that In step 3, the speed at which the clamping mechanism moves vertically along the column is 0.01 m / s to 0.05 m / s.

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