Device and method for testing repose angle of energetic material particles with low free-flow and low bulk density

Abstract

The invention discloses a device and method for testing the repose angle of energetic material particles with low free-flow and low stacking density, the testing device comprises a protractor and a stacking mechanism, the stacking mechanism comprises a base, a negative pressure cover is arranged on the base, a door capable of being opened and closed is arranged on the negative pressure cover, and a charging barrel is arranged in the negative pressure cover; the charging barrel is provided with a voice coil motor serving as a vibration source, the charging barrel is further connected with a clamping mechanism, and the other end of the clamping mechanism penetrates out of the side wall of the negative pressure cover and is connected with a stand column arranged on the base; a suction opening used for being connected with negative pressure equipment is formed in the position, located above the charging barrel, of the top of the negative pressure cover. According to the cylindrical charging barrel, the problems that energetic material particles of a conical charging barrel are prone to bridging, and accumulation bodies are difficult to form are solved; the voice coil motor serves as a vibration source, the consistency and stability of the energetic material in the initial state are guaranteed, the energetic material particles floating in the air are pumped away by providing a negative pressure environment, and the safety and accuracy of repose angle testing are obviously improved.

Description

Technical Field

[0001] The invention belongs to the technical field of energetic material measurement, relates to a repose angle testing device, and specifically relates to a repose angle testing device for energetic material particles with low dispersion and low bulk density. Background Art

[0002] In order to meet the requirements of weapon equipment development, some ultrafine energetic material components with low dispersion and low bulk density are usually added to the new energetic material formula to increase the power of the product. In order to improve the safety and quality of the processing process, it is necessary to study the ultrafine energetic material particles and clarify their particle characteristics. For ultrafine energetic material particles, in addition to the basic characteristics such as Poisson's ratio, particle size, modulus, etc., the parameter that has the greatest impact on the processing process is its fluidity or dispersion. The angle of repose characterizes the inclination angle of a material in a stable state and is an important indicator for evaluating the fluidity and dispersion of a material. However, particles of energetic material components with low dispersion and low bulk density are difficult to naturally stack densely and have serious agglomeration phenomenon. Existing testing devices are not suitable for testing the angle of repose of particles of energetic material components. This is mainly because: most existing testing devices use funnel-shaped hoppers, while particles of energetic materials with low dispersion and low bulk density are light in weight and prone to floating; particles of energetic materials are prone to bridge at the discharge port during the falling process and cannot fall smoothly, making it difficult to form a deposit; particles of energetic materials are extremely easy to adsorb on inclined walls, reducing the test accuracy. Therefore, it is urgent to develop a device suitable for testing the angle of repose of particles of energetic materials with low dispersion and low bulk density. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a device for testing the angle of repose of low-dispersion and low-bulking-density energetic material particles, so as to solve the technical problem in the prior art of lack of a device suitable for testing the angle of repose of low-dispersion and low-bulking-density energetic material particles.

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

[0005] A device for testing the repose angle of particles of low-dispersion and low-stacking-density energetic materials, comprising a protractor and a stacking mechanism, wherein the stacking mechanism comprises a base, a negative pressure cover is arranged on the base, a door that can be opened and closed is provided on the negative pressure cover, a barrel is arranged inside the negative pressure cover, a voice coil motor used as a vibration source is installed on the barrel, one end of a clamping mechanism is also connected to the barrel, and the other end of the clamping mechanism passes through the side wall of the negative pressure cover and is connected to a column arranged on the base;

[0006] The top of the negative pressure cover is located above the barrel and is provided with a suction port for connecting to a negative pressure device.

[0007] The present invention also has the following technical features:

[0008] Specifically, the clamping mechanism includes a fixed block arranged on the column and a cross bar connected to the fixed block, and one end of the cross bar away from the column is connected to the barrel.

[0009] Furthermore, the top of the barrel is provided with a feed port, and the bottom is provided with a discharge port, the discharge port is movably connected with a discharge port baffle, the discharge port baffle is connected with a support rod that can move in a horizontal direction, and the support rod passes through the side wall of the negative pressure hood and is connected to the column.

[0010] Furthermore, two grooves capable of slidingly cooperating with the bottom end of the barrel side wall are provided on a side of the discharge port baffle plate facing the barrel body.

[0011] Furthermore, the barrel includes a front plate, a first side plate, a rear plate and a second side plate which are connected to each other, and the bottom ends of the first side plate and the second side plate can be slidably matched with the groove.

[0012] Furthermore, the vertical distance between the upper end surface of the base and the lower end surface of the barrel is 80 mm to 120 mm;

[0013] The barrel is cylindrical, and has an inner diameter of 50 to 80 mm and a height of 50 to 60 mm.

[0014] The base is made of tin bronze, and the columns, negative pressure cover, discharge port baffle and support rods are all made of nitrided steel.

[0015] Furthermore, the negative pressure equipment includes a negative pressure motor and a buffer tank, the buffer tank is connected to a gas pipeline, and the gas pipeline is connected to the suction port.

[0016] The present invention also protects a method for testing the repose angle of low-dispersion, low-bulk density energetic material particles, which is implemented by the above-mentioned repose angle test of low-dispersion, low-bulk density energetic material particles, and comprises the following steps:

[0017] Step 1: Open the feed door, add energetic materials into the barrel, and start the voice coil motor to vibrate for 1 to 5 minutes;

[0018] Step 2, start the negative pressure fan to suck, and after the preset negative pressure is reached in the negative pressure cover, open the discharge port baffle to allow the energetic material components to freely fall onto the base to form a pile;

[0019] Step 3: Open the feed door and use a protractor to manually measure the angle of repose of the energetic material particles.

[0020] Preferably, in step 1, the vibration frequency of the voice coil motor is 10-20 Hz, and the amplitude is 0.1 mm-0.3 mm; in step 2, the preset negative pressure is -10 Kpa--30 Kpa.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The repose angle testing device for low-dispersion and low-stacking-density energetic material particles provided by the present invention has a simple structure and is easy to use. It can effectively solve the problems that low-dispersion and low-stacking-density energetic material component particles are difficult to naturally and densely stack, agglomerate seriously, and the testing process is highly dangerous. The barrel structure is set to a straight barrel type, which effectively avoids the problem of increased friction between particles due to the large contact surface of the conical barrel. The barrel is vibrated by using a voice coil motor as a vibration source, which ensures the consistency and stability of the energetic material in the initial state and improves the test accuracy.

[0023] (2) The method of the present invention achieves the purpose of dense accumulation of energetic material particles by driving the energetic material particles to vibrate through a voice coil motor during the test process, thereby improving the accuracy of the repose angle test of the energetic material particles; the agglomerates formed by the energetic material particles are opened up by vibration, thereby increasing the reliability of the test results; and the floating particles are sucked away by providing a negative pressure environment, thereby improving the safety and accuracy of the test.

[0024] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the data acquisition device of the present invention.

[0026] The symbols in the figure represent:

[0027] 1-base, 2-negative pressure cover, 3-barrel, 4-voice coil motor, 5-clamping mechanism, 6-column, 7-negative pressure equipment, 8-support rod, 9-gas pipeline, 10-discharge port baffle; 51-fixed block, 52-cross bar; 71-negative pressure motor, 72-buffer tank.

[0028] The specific contents of the present invention are further explained in detail below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The low-dispersion, low-stacking-density energetic material particles described in the present invention refer to energetic materials with serious agglomeration between particles and a particle size of less than 50 microns.

[0033] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0034] Example

[0035] Following the above technical solution, Figure 1 As shown, the present invention discloses a device for testing the angle of repose of energetic material particles with low dispersion and low stacking density, comprising a protractor and a stacking mechanism, wherein the protractor is used to measure the angle of repose of energetic material particles, and the stacking mechanism is used to form a stack of energetic material particles, wherein the stacking mechanism comprises a base 1, and a negative pressure hood 2 is arranged on the base 1. Since energetic materials are flammable and explosive when dispersed in the environment, the negative pressure hood 2 is arranged to improve the safety of the testing process. The negative pressure cover 2 is provided with a door that can be opened and closed, a barrel 3 is arranged inside the negative pressure cover 2, a voice coil motor 4 used as a vibration source is installed on the barrel 3, one end of a clamping mechanism 5 is also connected to the barrel 3, and the other end of the clamping mechanism 5 passes through the side wall of the negative pressure cover 2 and is connected to a column 6 arranged on the base 1; the clamping mechanism 5 is used to fix the barrel 3, and the voice coil motor 4, as a vibration source, can provide the barrel with an amplitude of 1 mm and a vibration frequency of 10 Hz during the feeding stage, on the one hand, the energetic material particles are vibrated to achieve the purpose of dense stacking and improve the test accuracy; on the other hand, since the energetic material component particles with low fluidity and low stacking density usually have the characteristics of small particle size and easy agglomeration to form agglomerates, the agglomerates can be opened by vibration, thereby increasing the reliability of the test results.

[0036] A suction port 21 for connecting to the negative pressure device 7 is provided at the top of the negative pressure cover 2 above the barrel 3 .

[0037] As a preferred solution of this embodiment, the clamping mechanism 5 includes a fixing block 51 arranged on the column 6 and a cross bar 52 connected to the fixing block 51 , and one end of the cross bar 52 away from the column 6 is connected to the barrel 3 .

[0038] As a preferred solution of this embodiment, the barrel 3 is provided with a feed port at the top and a discharge port at the bottom, and the discharge port is movably connected with a discharge port baffle 10, and the discharge port baffle 10 is connected with a support rod 8 that can move in the horizontal direction, and the support rod 8 passes through the side wall of the negative pressure hood 2 and is connected to the column 6; in this embodiment, the support rod 8 is movably connected to the column 6, which can drive the outlet baffle plate to move horizontally to open or close the discharge port.

[0039] As a preferred solution of this embodiment, the discharge port baffle plate 8 has two grooves on one side facing the barrel 3 body that can slidably cooperate with the bottom end of the side wall of the barrel 3.

[0040] As a preferred solution of this embodiment, the barrel 3 includes a front plate, a first side plate, a rear plate and a second side plate which are connected to each other, and the bottom ends of the first side plate and the second side plate can slide in cooperation with the groove.

[0041] As a preferred solution of this embodiment, the vertical distance between the upper end surface of the base 1 and the lower end surface of the barrel 3 is 80 mm to 120 mm.

[0042] As a preferred solution of this embodiment, the barrel 3 is cylindrical, and the inner diameter of the barrel 3 is 50-80 mm, and the height is 50-60 mm. Setting the barrel 3 to a straight barrel avoids the problem of increased friction on the contact surface caused by the conical barrel.

[0043] As a preferred solution of this embodiment, the base 1 is made of tin bronze, and the column 6, the negative pressure cover 2, the discharge port baffle 10 and the support rod 8 are all made of nitrided steel.

[0044] As a preferred solution of this embodiment, the negative pressure device 7 includes a negative pressure motor 71 and a buffer tank 72, and the buffer tank 72 is connected to a gas pipeline 9, and the gas pipeline 9 is connected to the suction port 21. The negative pressure motor 71 is used to generate negative pressure by suction, and the buffer tank port 72 is provided with a valve and a pressure gauge, and the pressure gauge can detect the pressure inside the negative pressure hood, and adjust the valve opening according to the measured pressure of the pressure gauge to control the pressure inside the negative pressure hood 2.

[0045] When this embodiment is used: first open the door of the negative pressure hood, weigh a certain amount of energetic material and add it into the barrel, and start the voice coil motor to vibrate for 1 to 5 minutes; close the door and start the negative pressure fan to form a negative pressure in the negative pressure hood; open the discharge port baffle to allow the energetic material to freely fall onto the base under negative pressure conditions to form a deposit; open the front plate of the negative pressure hood, and use a protractor to measure the repose angle.

[0046] Example 2

[0047] This embodiment discloses a method for testing the angle of repose of energetic material particles with low dispersion and low bulk density provided by Example 1 to complete the measurement of the angle of repose of 10 μm-level ammonium perchlorate particles. This method is implemented by the device for testing the angle of repose of energetic material particles with low dispersion and low bulk density provided by Example 1, and includes the following steps:

[0048] Step 1, open the feed door, place 20g of 10μm-grade ammonium perchlorate particles in the barrel, observe that there are a lot of agglomerates and gaps in the 10μm-grade ammonium perchlorate particles, and start the voice coil motor 4 to vibrate at a frequency of 10Hz for 1min;

[0049] Step 2: After stopping the vibration, start the negative pressure fan 71 to suck, so that a negative pressure of -10 kPa is formed in the negative pressure cover 2. After standing for 5 minutes, the discharge port baffle 10 is opened by pulling the support rod 8 at a pulling speed of not less than 0.5 m / s, so that the ammonium perchlorate particles fall freely onto the base 1 under negative pressure conditions to form a pile.

[0050] Since the stacking density of low-flow and low-stacking-density energetic material particles is low, the floating phenomenon is serious during the falling process. Therefore, the floating particles can be sucked away by setting negative pressure. The advantages are: on the one hand, it can reduce the particle concentration in the air and improve the process safety; on the other hand, it eliminates the influence of the falling of discrete particles on the test accuracy.

[0051] During the test, the voice coil motor 4 is used to drive the energetic material particles to vibrate, thereby achieving the purpose of dense accumulation of the energetic material particles and improving the accuracy of the repose angle test of the energetic material particles; the agglomerates formed by the energetic material particles are broken up by the vibration of the voice coil motor 4, thereby increasing the reliability of the test results.

[0052] Step 3: open the door of the negative pressure cover 2 and use a protractor to manually measure the angle of repose of the energetic material particles. In this embodiment, the final measured angle of repose is 55.6°.

[0053] 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. A device for testing the repose angle of low-dispersion and low-stacking-density energetic material particles, comprising a protractor and a stacking mechanism, wherein the stacking mechanism comprises a base (1), characterized in that: The base (1) is provided with a negative pressure cover (2), the negative pressure cover (2) is provided with a door that can be opened and closed, a barrel (3) is provided inside the negative pressure cover (2), a voice coil motor (4) used as a vibration source is installed on the barrel (3), one end of a clamping mechanism (5) is also connected to the barrel (3), and the other end of the clamping mechanism (5) passes through the side wall of the negative pressure cover (2) and is connected to a column (6) provided on the base (1); A suction port (21) for connecting to a negative pressure device (7) is provided at the top of the negative pressure cover (2) located above the barrel (3).

2. The low-dispersion, low-bulk-density energetic material particle repose angle test device according to claim 1, characterized in that: The clamping mechanism (5) comprises a fixing block (51) arranged on the column (6) and a cross bar (52) connected to the fixing block (51); one end of the cross bar (52) away from the column (6) is connected to the barrel (3).

3. The low dispersion and low bulk density energetic material particle repose angle test device as claimed in claim 1, characterized in that: The barrel (3) is provided with a feed inlet at the top and a discharge outlet at the bottom. The discharge outlet is movably connected to a discharge outlet baffle (10). The discharge outlet baffle (10) is connected to a support rod (8) that can move in the horizontal direction. The support rod (8) passes through the side wall of the negative pressure cover (2) and is connected to the column (6).

4. The low-dispersion, low-bulk-density energetic material particle repose angle test device as claimed in claim 1, characterized in that: The discharge port baffle plate (8) has two grooves on one side facing the barrel (3) body that can slidably cooperate with the bottom end of the barrel (3) side wall.

5. The low-dispersion, low-bulk-density energetic material particle repose angle test device as claimed in claim 4, characterized in that: The barrel (3) comprises a front plate, a first side plate, a rear plate and a second side plate which are connected to each other, and the bottom ends of the first side plate and the second side plate can be slidably matched with the groove.

6. The low-dispersion, low-bulk-density energetic material particle repose angle test device as claimed in claim 1, characterized in that: The vertical distance between the upper end surface of the base (1) and the lower end surface of the barrel (3) is 80 mm to 120 mm; The barrel (3) is cylindrical, and the inner diameter of the barrel (3) is 50 to 80 mm, and the height is 50 to 60 mm.

7. The low-dispersion, low-bulk-density energetic material particle repose angle test device as claimed in claim 1, characterized in that: The base (1) is made of tin bronze, and the upright column (6), negative pressure cover (2), discharge port baffle (10) and support rod (8) are all made of nitrided steel.

8. The low-dispersion, low-bulk-density energetic material particle repose angle test device as claimed in claim 1, characterized in that: The negative pressure device (7) comprises a negative pressure motor (71) and a buffer tank (72); the buffer tank (72) is connected to a gas pipeline (9); and the gas pipeline (9) is connected to the suction port (21).

9. A method for testing the angle of repose of low-dispersion, low-bulk-density energetic material particles, characterized in that: The method is implemented by a low-dispersion, low-bulk-density energetic material particle repose angle testing device as claimed in any one of claims 1 to 8, comprising the following steps: Step 1: Open the feed door, add energetic materials into the barrel, and start the voice coil motor to vibrate for 1 to 5 minutes; Step 2, start the negative pressure fan to suck, and after the preset negative pressure is reached in the negative pressure cover, open the discharge port baffle to allow the energetic material components to freely fall onto the base to form a pile; Step 3: Open the feed door and use a protractor to manually measure the angle of repose of the energetic material particles.

10. The method for testing the angle of repose of low-dispersion, low-bulk-density energetic material particles according to claim 1, characterized in that: In the step 1, the vibration frequency of the voice coil motor is 10 to 20 Hz, and the amplitude is 0.1 mm to 0.3 mm; in the step 2, the preset negative pressure is -10 Kpa to -30 Kpa.

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