A powder electrostatic accumulation characteristic tester

Abstract

This invention provides a powder electrostatic accumulation characteristic tester, belonging to the technical field of powder material electrostatic testing instruments. It includes an experimental chamber and a chute, a Faraday cup, a humidity control device, a temperature control device, and a feeding device disposed within the chamber. The Faraday cup is located below the bottom of the chute. The humidity control device is used to regulate the humidity within the experimental chamber. The temperature control device is used to regulate the temperature within the experimental chamber. The feeding device includes a lifting mechanism, a tilting plate, and a Faraday cup fixed to the tilting plate. The end of the tilting plate near the top of the chute is hinged, and the lifting mechanism is connected to the position of the tilting plate away from the top of the chute. The Faraday cup is used to hold the powder sample and pours the powder sample into the top of the chute during tilting. This invention can obtain the electrostatic accumulation characteristics of powder samples under different temperature and humidity conditions, and the experimental data is more accurate, providing data support for powder electrostatic prevention in actual production.

Description

Technical Field

[0001] This invention relates to the field of electrostatic testing instruments for powder materials, and in particular to a powder electrostatic accumulation characteristic tester. Background Technology

[0002] Powder materials are widely used in aerospace, military defense, chemical engineering, electronics, and food processing, playing a crucial role in modern industrial and technological development. However, static electricity is inevitably generated during the production, transportation, storage, and use of powder materials. In recent years, frequent explosions and combustion accidents caused by static electricity have resulted in serious casualties and property damage, drawing significant attention from those working in the powder industry. Simulating the static charging process during production and testing the electrostatic accumulation characteristics of powder materials to assess their electrostatic safety is of great importance for preventing electrostatic hazards.

[0003] Existing research indicates that the charging process of powder materials is typically influenced by a combination of factors, including external conditions (temperature, relative humidity), stress conditions (friction), particle geometry (size, shape, contact area, roughness), and chemical conditions (presence of antistatic agents, mixing with chemical substances). For example, ambient humidity significantly affects the amount of water molecules adsorbed on the powder material surface, influencing its surface conductivity (i.e., surface work function) and thus its ability to dissipate static charge, ultimately significantly impacting the electrostatic accumulation characteristics of the powder material. Furthermore, ambient temperature also alters the conductivity, electron and impurity mobility, and the state of adsorbed water on the powder material surface. Therefore, accurately characterizing the electrostatic hazards of powder materials and quantitatively analyzing the influence of ambient temperature, humidity, and frictional stress on the electrostatic accumulation characteristics of powder materials remains quite challenging.

[0004] Furthermore, static electricity accumulation in powder materials caused by friction, contact, separation, or other physical processes can lead to static voltage on or within the powder material. Static voltage is one of the important physical parameters characterizing electrostatic safety. When the electrostatic field strength reaches the breakdown field strength of the environmental medium, electrostatic discharge will occur. However, currently, there is a lack of multi-parameter simultaneous detection instruments for the amount of static electricity accumulation and static voltage in powder materials. Establishing a quantitative functional equation between static voltage and electrostatic charge in powder materials under different testing conditions still lacks effective equipment and evaluation methods.

[0005] In summary, while currently available electrostatic accumulation testing equipment can assess the electrostatic accumulation parameters of powder materials, there is still a lack of effective testing equipment and methods for evaluating the quantitative relationship between environmental temperature and humidity, powder stress conditions, chute material, powder geometry and chemical conditions, and powder electrostatic accumulation and static voltage. There is an urgent need to develop new multi-factor parameter control testing instruments to lay the foundation for accurate evaluation of electrostatic safety control technologies for powder materials. Summary of the Invention

[0006] The purpose of this invention is to provide a powder electrostatic accumulation characteristic tester to solve the problems existing in the prior art. By setting a temperature control device and a humidity control device inside the test chamber, the electrostatic accumulation of powder samples during friction under different temperature and humidity conditions can be detected, reflecting the electrostatic accumulation characteristics of powder materials and providing data support for the comprehensive evaluation of the electrostatic safety of powder materials.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] An instrument for detecting the electrostatic accumulation characteristics of powder includes an experimental chamber and a chute, a Faraday cup, a humidity control device, a temperature control device, and a feeding device disposed within the experimental chamber. The chute is used for the powder sample to slide down; the Faraday cup is located below the bottom end of the chute; the humidity control device is used to adjust the humidity in the experimental chamber; the temperature control device is used to adjust the temperature in the experimental chamber; the feeding device includes a lifting mechanism, a flipping plate, and a Faraday cup fixed on the flipping plate. The end of the flipping plate near the top of the chute is hinged, and the lifting mechanism is connected to the position of the flipping plate away from the top of the chute. The lifting mechanism is used to flip the flipping plate around the hinged end. The Faraday cup is used to hold the powder sample and pours the powder sample into the top of the chute during flipping.

[0009] As one embodiment, the lifting mechanism includes a fixedly mounted bidirectional rotating motor, a first connecting rod, and a second connecting rod. The output end of the bidirectional rotating motor is fixedly connected to one end of the first connecting rod, the other end of the first connecting rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the flipping plate.

[0010] As one embodiment, the lifting mechanism further includes a fixed platform, on which both the flipping plate and the lifting mechanism are mounted. A first weight sensor is also mounted on the fixed platform. The first weight sensor is located at the bottom of the flipping plate in the unflipped state and is used to obtain the mass of the powder sample in the Faraday cup.

[0011] As one embodiment, a metal discharge pipe is provided below the bottom end of the chute and communicates with the Faraday cylinder. The discharge pipe includes a straight pipe section and an annular protruding section. The protruding section has an annular receiving cavity. An insulating layer coplanar with the inner wall of the straight pipe section is provided in the receiving cavity. An annular static voltage test electrode is provided on the outer wall of the insulating layer.

[0012] In one embodiment, the humidity control device includes a humidification port, a dehumidification pump, and a circulating fan disposed in the experimental chamber. The humidification port is connected to a humidifier. The dehumidification pump and the circulating fan are located on different walls inside the experimental chamber. A first humidity sensor is disposed near the dehumidification pump, and a second humidity sensor is disposed near the circulating fan.

[0013] In one embodiment, the temperature regulating device includes a heater, the heat dissipation end of which is located inside the experimental chamber, and a temperature sensor is also provided inside the experimental chamber.

[0014] In one embodiment, the heater includes a temperature-controlled water tank, a circulating water pump, and a heat exchange tube. The heat exchange tube is located inside the experimental chamber, and both ends of the heat exchange tube are connected to the temperature-controlled water tank via pipelines. The circulating water pump is located on the pipeline between the heat exchange tube and the temperature-controlled water tank.

[0015] As one embodiment, the back panel of the experimental chamber is also provided with an angle adjustment plate and an arc-shaped hole. The slide is fixedly connected to the angle adjustment plate through a slot. The top end of the angle adjustment plate is rotatably connected to the experimental chamber, and the bottom end of the angle adjustment plate is detachably connected to the location of the arc-shaped hole. The Faraday cylinder is set on an L-shaped plate. The vertical plate in the L-shaped plate is hinged to the bottom end of the angle adjustment plate. A second weight sensor for weighing the Faraday cylinder is provided on the horizontal plate in the L-shaped plate.

[0016] As one embodiment, it also includes a connecting bolt, which sequentially passes through the vertical plate of the L-shaped plate, the angle adjustment plate, and the arc-shaped hole on the back plate, and the end of the connecting bolt is connected to a lock nut.

[0017] As one embodiment, the experimental chamber is provided with a door panel, and both the door panel and the wall of the experimental chamber include an electromagnetic shielding layer, a heat insulation layer and an electrostatic protection layer arranged sequentially from the inside out.

[0018] The present invention has the following technical advantages over the prior art:

[0019] 1. This invention, by setting up temperature and humidity control devices inside the experimental chamber, can detect the amount of static electricity accumulated during the friction process of powder samples under different temperature and humidity conditions, providing data support for the comprehensive evaluation of the electrostatic safety of powder materials.

[0020] 2. This invention concentrates the entire experimental process inside the experimental chamber, avoiding the influence of the external environment (temperature, humidity, static electricity, etc.) on the experimental process, and ensuring the stability of the test results and the accuracy of the experimental data.

[0021] 3. The present invention is equipped with a feeding device in the experimental chamber. The feeding device can be used to pour powder samples into the chute without the need for staff to add the powder samples. This avoids the fluctuation of the experimental chamber environment caused by staff entering the experimental chamber again to pour powder samples after the environment inside the experimental chamber has been adjusted to the set value, which would increase the error of the experimental data. This further ensures the accuracy of the experimental data.

[0022] 4. This invention independently quantifies the initial charge of the powder sample before friction using a Faraday cup in the feeding device, eliminating the interference of the initial state of the sample on the detection results of the electrostatic accumulation characteristics of the powder and improving the detection accuracy.

[0023] 5. The present invention has a material drop pipe at the bottom of the chute, and an annular static voltage test electrode is installed inside the material drop pipe, which can detect the static voltage of the powder sample and can more comprehensively reflect the electrostatic accumulation characteristics of the powder sample. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a powder electrostatic accumulation characteristic detector according to one embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the feeding device in one embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the cooperative structure of the L-shaped plate, the angle adjustment plate and the back plate in one embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the material discharge pipe in one embodiment of the present invention;

[0029] Figure 5This is a schematic diagram of the control principle of a powder electrostatic accumulation characteristic detector in one embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram showing the test results of the electrostatic accumulation and electrostatic voltage of TATB (triaminotrinitrobenzene) at different temperatures in one embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram showing the test results of the electrostatic accumulation and electrostatic voltage of TATB (triaminotrinitrobenzene) under different humidity levels in one embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Experimental chamber; 2. Slide chute; 3. Faraday cup; 4. Feeding device; 5. Collection hopper; 6. Display screen; 7. Feeding hopper; 8. Host computer; 9. Drop pipe; 10. Protruding section; 11. Annular static voltage test electrode; 12. Insulation layer; 13. Humidification hole; 14. Dehumidification pump; 15. Circulating fan; 16. Heat exchange tube; 17. First temperature and humidity sensor; 18. Second temperature and humidity sensor; 19. Angle adjustment plate; 20. L-shaped plate; 21. Back plate; 22. Connecting bolt; 23. Locking nut; 24. Arc-shaped hole; 25. Door panel; 26. Back plate box; 27. Second weight sensor; 41. Flip plate; 42. Faraday cup; 43. Bidirectional rotating motor; 44. First connecting rod; 45. Second connecting rod; 46. Fixed platform; 47. First weight sensor. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The purpose of this invention is to provide a powder electrostatic accumulation characteristic tester to solve the problems existing in the prior art. By setting a temperature control device and a humidity control device inside the test chamber, the electrostatic accumulation of powder samples during friction under different temperature and humidity conditions can be detected, reflecting the electrostatic accumulation characteristics of powder materials and providing data support for the comprehensive evaluation of the electrostatic safety of powder materials.

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figures 1 to 7As shown, this embodiment provides a powder electrostatic accumulation characteristic tester, including an experimental chamber 1 and a chute 2, a Faraday cylinder 3, a humidity control device, a temperature control device, and a feeding device 4 disposed in the experimental chamber 1. The chute 2 is used for the powder sample to slide down; the Faraday cylinder 3 is located below the bottom end of the chute 2 to receive the sliding powder sample, and to facilitate the receiving of the powder sample, a collecting hopper 5 is provided below the bottom end of the chute 2, and the Faraday cylinder 3 is located below the collecting hopper 5. The humidity control device is used to adjust the humidity in the experimental chamber 1; the temperature control device is used to adjust the temperature in the experimental chamber 1. The feeding device 4 includes a lifting mechanism, a tilting plate 41, and a Faraday cup 42 fixed on the tilting plate 41. The end of the tilting plate 41 near the top of the chute 2 is hinged, and the position of the tilting plate 41 away from the top of the chute 2 is connected to the lifting mechanism. When the output end of the lifting mechanism raises the position of the tilting plate 41 away from the top of the chute 2, the tilting plate 41 can be tilted. The Faraday cup 42 is used to hold the powder sample. When the tilting plate 41 tilts, it will drive the Faraday cup 42 to tilt. When the Faraday cup 42 tilts, it will pour the powder sample into the top of the chute 2, so that the powder sample slides down from the top of the chute 2 and finally falls from the collection hopper 5 into the Faraday cylinder 3. In order to facilitate the centralized conveying of the powder sample and prevent the powder sample from falling outside the chute 2, a feeding hopper 7 is provided at the top of the chute 2. The feeding hopper 7 is located below the mouth of the Faraday cup 42 in the tilted state and is used to receive the powder sample.

[0038] This embodiment utilizes a Faraday cup 42 to obtain the initial charge Q1 of the powder sample, and a Faraday cylinder 3 to obtain the charge Q2 of the powder sample after it slides down. A first weight sensor 47 obtains the initial mass m1 of the powder sample in the Faraday cup 42, and a second weight sensor 27 obtains the mass m2 of the powder sample that falls into the Faraday cylinder 3 after friction via the chute. This allows for the acquisition of the electrostatic accumulation (Q2 / m2 - Q1 / m1) of the powder sample under different temperatures and humidity conditions. Compared to traditional powder electrostatic accumulation testing equipment, this eliminates the interference of the initial state of the sample on the detection results of the powder electrostatic accumulation characteristics, improving detection accuracy. Furthermore, the material of the chute 2 can be changed to obtain the electrostatic accumulation of the powder sample corresponding to different material chute 2s. In addition, this embodiment concentrates the entire experimental process inside the experimental chamber 1, avoiding the influence of the external environment (temperature, humidity, static electricity, etc.) on the experimental process, ensuring the stability of the test results and the accuracy of the experimental data. Furthermore, this embodiment includes a feeding device 4 in the experimental chamber 1. This device allows for the pouring of powder samples into the chute 2 without manual intervention. This avoids fluctuations in the internal environment of the experimental chamber 1 caused by staff re-entering to add powder samples after the environment has been adjusted to the set values, which could increase experimental data errors and thus further ensure the accuracy of the experimental data. Moreover, by incorporating temperature and humidity control devices inside the experimental chamber 1, this embodiment can detect the amount of static electricity accumulated during the friction process of the powder samples under different temperature and humidity conditions (unit: nC·g). -1 This provides data support for the comprehensive evaluation of the electrostatic safety of powder materials.

[0039] In this embodiment, the lifting mechanism includes a fixedly mounted bidirectional rotary motor 43, a first connecting rod 44, and a second connecting rod 45. The output end (output shaft) of the bidirectional rotary motor 43 is fixedly connected to one end of the first connecting rod 44, and the other end of the first connecting rod 44 is hinged to one end of the second connecting rod 45. The other end of the second connecting rod 45 is hinged to the flipping plate 41. When the output end of the bidirectional rotary motor 43 rotates, the movement of the first connecting rod 44 and the second connecting rod 45 can drive the flipping plate 41 to flip.

[0040] In this embodiment, the lifting mechanism also includes a fixed platform 46, a flipping plate 41, and the lifting mechanism itself, all mounted on the fixed platform 46. Specifically, the fixed platform 46 includes a horizontal platform surface, with a fixed plate vertically mounted at one end of the horizontal platform surface, and the flipping plate 41 hinged to the top of the fixed plate. A first weight sensor 47 is also mounted on the fixed platform 46, located at the bottom of the flipping plate 41 in the unflipped state, and is used to obtain the mass m1 of the powder sample in the Faraday cup 42.

[0041] In this embodiment, a metal discharge pipe 9, connected to the Faraday cylinder 3, is provided below the bottom end of the chute 2. The discharge pipe 9 includes a straight pipe section and an annular protruding section 10. The protruding section 10 has an annular receiving cavity, and an insulating layer 12, coplanar with the inner wall of the straight pipe section, is provided inside the receiving cavity. An annular electrostatic voltage testing electrode 11 is provided on the outer wall of the insulating layer 12. The annular electrostatic voltage testing electrode 11 is used to detect the electrostatic voltage V (unit V) of the powder sample in real time. The metal discharge pipe 9 acts as a shield, preventing static electricity from the external environment from affecting the charge of the measured powder sample. By measuring the electrostatic voltage of the powder sample, a more comprehensive understanding of the electrostatic accumulation characteristics of the powder sample can be obtained.

[0042] The humidity control device in this embodiment includes humidification holes 13, an exhaust pump 14, and a circulating fan 15 disposed in the experimental chamber 1. The humidification holes 13 are evenly distributed on the bottom plate of the experimental chamber 1 and connected to humidifiers; the exhaust pump 14 and the circulating fan 15 are located on different walls inside the experimental chamber 1. Specifically, the exhaust pump 14 is located on the side wall of the experimental chamber 1, and the circulating fan 15 can be located on the top plate of the experimental chamber 1. The exhaust pump 14 and the humidifier are used to regulate the humidity inside the experimental chamber 1, and the circulating fan 15 is used to promote air circulation inside the experimental chamber 1, which is beneficial for uniform air humidity and temperature in the laboratory. A first humidity sensor is disposed near the exhaust pump 14 inside the experimental chamber 1, and a second humidity sensor is disposed near the circulating fan 15. The first humidity sensor detects the temperature and humidity near the exhaust pump 14, and the second humidity sensor detects the temperature and humidity near the circulating fan 15. When the humidity parameters detected by the first and second humidity sensors are consistent and meet the preset humidity test conditions, the electrostatic accumulation characteristic test of the powder sample is performed to achieve uniform distribution and precise control of humidity in the test environment.

[0043] In this embodiment, the temperature control device includes a heater, the heat dissipation end of which is located inside the experimental chamber 1. A temperature sensor is also installed inside the experimental chamber 1. Specifically, the heater includes a temperature-controlled water tank, a circulating water pump, and a heat exchange tube 16. The heat exchange tube 16 is located inside the experimental chamber 1, and both ends of the heat exchange tube 16 are connected to the temperature-controlled water tank via pipelines. The circulating water pump is located on the pipeline between the heat exchange tube 16 and the temperature-controlled water tank. The circulating water pump delivers warm water from the temperature-controlled water tank into the heat exchange tube 16, thereby regulating the temperature inside the experimental chamber 1. The heat exchange tube 16 is a serpentine coil, and the temperature inside the temperature-controlled water tank can be adjusted according to experimental needs. To detect the temperature inside the experimental chamber 1, a temperature sensor needs to be installed inside the experimental chamber 1. To reduce the number of sensing elements, the first humidity sensor and the second humidity sensor can be selected as a first temperature and humidity sensor 17 and a second temperature and humidity sensor 18, both of which have temperature detection functions.

[0044] The heater can also be a resistance heating wire.

[0045] In this embodiment, the back plate 21 of the experimental chamber 1 is also provided with an angle adjustment plate 19 and an arc-shaped hole 24. The slide 2 is fixedly connected to the angle adjustment plate 19 through a slot. The top end of the angle adjustment plate 19 is rotatably connected to the experimental chamber 1, and the bottom end of the angle adjustment plate 19 is detachably connected to the position of the arc-shaped hole 24. The Faraday cylinder 3 is set on the L-shaped plate 20. The vertical plate in the L-shaped plate 20 is hinged to the bottom end of the angle adjustment plate 19. A second weight sensor 27 for weighing the Faraday cylinder 3 is set on the horizontal plate in the L-shaped plate 20 to obtain the mass of the powder sample inside the Faraday cylinder 3. Specifically, this embodiment also includes a connecting bolt 22, which passes through the vertical plate of the L-shaped plate 20, the angle adjustment plate 19, and the arc-shaped hole 24 on the back plate 21 in sequence. The end of the connecting bolt 22 is connected to a locking nut 23. By changing the position of the connecting bolt 22 on the arc-shaped hole 24, the tilt angle of the angle adjustment plate 19 and the slide 2 can be changed, thereby changing the changes in the static voltage V and the charge Q2 after the powder sample falls under different gravity.

[0046] In this embodiment, the experimental chamber 1 is equipped with a door panel 25. Both the door panel 25 and the walls of the experimental chamber 1 include an electromagnetic shielding layer, a heat insulation layer, and an electrostatic protection layer, arranged sequentially from the inside out, to reduce the influence of the external environment on the internal environment of the experimental chamber 1. The electromagnetic shielding layer provides efficient electromagnetic shielding to prevent external electromagnetic interference. The heat insulation layer maintains the temperature stability of the internal testing environment of the experimental chamber 1, preventing heat loss or external heat transfer. The electrostatic protection layer, through a grounding design, quickly conducts away static charges, preventing static electricity from affecting the testing area.

[0047] In this embodiment, the door panel 25 and other walls of the experimental chamber 1 should be made as transparent as possible so that staff can observe the internal condition of the experimental chamber 1.

[0048] This embodiment also includes a controller, which is communicatively connected to the first temperature and humidity sensor 17, the second temperature and humidity sensor 18, the bidirectional rotary motor, and other electrical components. The controller is used to collect and process experimental data, and also to control the bidirectional rotary motor. Specifically, the controller includes a signal acquisition and processing module and a host computer 8. The controller can be installed in the back panel box 26 on the back of the experimental chamber 1, with the back panel 21 separating the two chambers. To facilitate the operator's monitoring of data changes (temperature, humidity, charge, etc.) during the experiment, a display screen 6, communicatively connected to the controller, is also installed on the back panel 21 to display experimental data in real time.

[0049] This embodiment also provides a method for detecting the electrostatic accumulation characteristics of powder, including the following steps:

[0050] (1) Select the material of the target slide 2, adjust the tilt angle of the slide 2 in the experimental chamber 1, and set the environmental temperature and humidity conditions.

[0051] (2) After the test environment stabilizes, perform the zeroing operation and add a certain mass of powder sample into the Faraday cup 42, and close the door 25 of the test chamber 1.

[0052] (3) After the initial charge Q1 and initial mass m1 readings of the powder sample stabilize, the bidirectional rotating motor 43 is activated, causing the Faraday cup 42 to flip and pour the material.

[0053] (4) After the powder sample is rubbed by the chute 2, it falls into the Faraday cylinder 3 through the collecting hopper 5. The static voltage V, the charge Q2 after sliding and the mass m2 of the sample falling into the Faraday cylinder 3 are obtained.

[0054] (5) Clean the equipment using cotton soaked in ethyl acetate, ethanol or water;

[0055] (6) Repeat steps (1) to (5) to perform the test, and calculate the average value of the static electricity accumulation and static voltage multiple times to reduce the test error;

[0056] (7) According to the test requirements, adjust the test conditions and repeat steps (1), (2), (3), (4), (5), and (6) to obtain the electrostatic accumulation and static voltage parameters of the powder sample under different test conditions. Use software to perform data analysis, fit the functional equations of ambient temperature, humidity, chute angle 2, and powder sample particle size with the electrostatic accumulation and static voltage of the powder sample, and realize the influence law analysis and parameter prediction of the electrostatic accumulation and static voltage of the powder under different conditions.

[0057] Two specific examples will be used to illustrate this:

[0058] Example 1: Test on the effect of ambient temperature on the static accumulation and electrostatic voltage of TATB (triaminotrinitrobenzene) powder sample

[0059] (1) Select a stainless steel slide 2, adjust the tilt angle of slide 2 to 45°, set the ambient temperature to 30° and the relative humidity to 40%.

[0060] (2) After the temperature and humidity of the test environment stabilize, perform the zeroing operation, add 5g of TATB powder into the Faraday cup 42, and close the door 25 of the test chamber 1.

[0061] (3) After the initial charge Q1 and initial mass m1 readings of the powder sample stabilize, the bidirectional rotating motor 43 is activated to realize the flipping and pouring of the Faraday cup 42.

[0062] (4) After the powder sample is rubbed by the chute 2, it falls into the Faraday cylinder 3 through the collecting hopper 5. The static voltage V, the charge Q2 after sliding and the mass m2 of the sample falling into the Faraday cylinder 3 are obtained.

[0063] (5) Use cotton soaked in ethyl acetate or ethanol to clean the equipment;

[0064] (6) Repeat steps (1) to (5) to perform the test. Repeat the test multiple times (6 to 8 times) to obtain the average value of the static electricity accumulation and static voltage in order to reduce the test error.

[0065] (7) According to the test requirements, adjust the ambient temperature to 20℃, 25℃, 30℃, 35℃ and 40℃, repeat steps (1) to (6), obtain the electrostatic accumulation and static voltage parameters of TATB powder samples under different test conditions, use software to perform data analysis, fit the functional equation of ambient temperature and electrostatic accumulation and static voltage of TATB powder samples, realize the influence law analysis of ambient temperature on electrostatic accumulation and static voltage of TATB powder samples, and make preliminary prediction of electrostatic accumulation and static voltage parameters of TATB powder samples at different temperatures.

[0066] (8) Test results are as follows Figure 6 As shown, as the ambient temperature gradually increases from 20℃ to 40℃, the electrostatic accumulation and static voltage of the TATB powder sample after friction through the 45° stainless steel chute 2 both show a gradual increasing trend. This may be due to the change in the migration rate of TATB impurities and the change in surface adsorbed water caused by the ambient temperature, which in turn changes the resistivity of TATB and affects the electrostatic accumulation and static voltage.

[0067] Example 2: Test on the effect of ambient humidity on TATB electrostatic accumulation and static voltage

[0068] (1) Select a stainless steel slide 2, adjust the tilt angle of slide 2 to 45°, set the ambient temperature to 30° and the relative humidity to 40%.

[0069] (2) After the temperature and humidity of the test environment stabilize, perform the zeroing operation, add 5g of TATB powder into the Faraday cup 42, and close the door 25 of the test chamber 1.

[0070] (3) After the initial charge Q1 and initial mass m1 readings of the powder sample stabilize, the bidirectional rotating motor 43 is activated to realize the flipping and pouring of the Faraday cup 42.

[0071] (4) After the powder sample is rubbed by the chute 2, it falls into the Faraday cylinder 3 through the collecting hopper 5. The static voltage V, the charge Q2 after sliding and the mass m2 of the sample falling into the Faraday cylinder 3 are obtained.

[0072] (5) Use cotton soaked in ethyl acetate or ethanol to clean the equipment;

[0073] (6) Repeat steps (1) to (5) to perform the test, and repeatedly calculate the average value of the electrostatic accumulation and electrostatic voltage of the TATB powder sample to reduce the test error.

[0074] (7) According to the test requirements, adjust the ambient humidity to 20%, 30%, 40%, 50%, and 60%, and repeat steps (1) to (6) to obtain the electrostatic accumulation and static voltage parameters of TATB powder samples under different test conditions. Use software to perform data analysis, fit the functional equation of ambient humidity and electrostatic accumulation and static voltage of TATB powder samples, realize the influence law analysis of ambient humidity on electrostatic accumulation and static voltage of TATB powder samples, and make preliminary predictions of electrostatic accumulation and static voltage parameters of TATB powder samples at different temperatures.

[0075] (8) Test results are as follows Figure 7 As shown, as the ambient humidity gradually increases from 20% to 60%, the static electricity accumulation and static voltage of TATB after friction through the 45° stainless steel chute 2 both show a gradual increasing trend. This may be because when the ambient humidity is high, the TATB powder adsorbs more water molecules, which leads to an increase in its surface conductivity, thereby enhancing the static charge leakage ability and greatly accelerating the static charge decay rate, effectively limiting the static electricity accumulation and static voltage increase of TATB.

[0076] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0077] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A powder electrostatic accumulation characteristic tester, characterized in that, Includes the experimental chamber and the following components housed within it: A chute is used for the powder sample to slide down; A Faraday cylinder, wherein the Faraday cylinder is located below the bottom end of the groove; A humidity control device is used to regulate the humidity in the experimental chamber; A temperature control device is used to regulate the temperature in the experimental chamber; The feeding device includes a lifting mechanism, a tilting plate, and a Faraday cup fixed on the tilting plate. The end of the tilting plate near the top of the chute is hinged, and the lifting mechanism is connected to the tilting plate away from the top of the chute. The lifting mechanism is used to tilt the tilting plate around the hinged end. The Faraday cup is used to hold the powder sample and pour the powder sample into the top of the chute when tilting. The lifting mechanism includes a fixedly installed bidirectional rotary motor, a first connecting rod, and a second connecting rod. The output end of the bidirectional rotary motor is fixedly connected to one end of the first connecting rod, the other end of the first connecting rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the flipping plate. The lifting mechanism also includes a fixed platform, and the flipping plate and the lifting mechanism are both mounted on the fixed platform. A first weight sensor is also mounted on the fixed platform. The first weight sensor is located at the bottom of the flipping plate in the unflipped state and is used to obtain the mass of the powder sample in the Faraday cup. Below the bottom of the chute, there is a metal discharge pipe that communicates with the Faraday cylinder. The discharge pipe includes a straight pipe section and an annular protruding section connected to each other. The interior of the protruding section has an annular receiving cavity. An insulating layer coplanar with the inner wall of the straight pipe section is provided in the receiving cavity. An annular static voltage test electrode is provided on the outer wall of the insulating layer.

2. The powder electrostatic accumulation characteristic tester according to claim 1, characterized in that, The humidity control device includes a humidification port, a dehumidification pump, and a circulating fan installed in the experimental chamber. The humidification port is connected to a humidifier. The dehumidification pump and the circulating fan are located on different walls inside the experimental chamber. A first humidity sensor is installed near the dehumidification pump, and a second humidity sensor is installed near the circulating fan.

3. The powder electrostatic accumulation characteristic detector according to claim 2, characterized in that, The temperature control device includes a heater, the heat dissipation end of which is located inside the experimental chamber, and a temperature sensor is also installed inside the experimental chamber.

4. The powder electrostatic accumulation characteristic tester according to claim 3, characterized in that, The heater includes a temperature-controlled water tank, a circulating water pump, and a heat exchange tube. The heat exchange tube is located inside the experimental chamber, and both ends of the heat exchange tube are connected to the temperature-controlled water tank through pipelines. The circulating water pump is located on the pipeline between the heat exchange tube and the temperature-controlled water tank.

5. The powder electrostatic accumulation characteristic tester according to claim 1, characterized in that, The back panel of the experimental chamber is also provided with an angle adjustment plate and an arc-shaped hole. The slide is fixedly connected to the angle adjustment plate through a slot. The top of the angle adjustment plate is rotatably connected to the experimental chamber, and the bottom of the angle adjustment plate is detachably connected to the location of the arc-shaped hole. The Faraday cylinder is set on an L-shaped plate. The vertical plate in the L-shaped plate is hinged to the bottom of the angle adjustment plate. A second weight sensor for weighing the Faraday cylinder is provided on the horizontal plate in the L-shaped plate.

6. The powder electrostatic accumulation characteristic tester according to claim 5, characterized in that, It also includes connecting bolts, which pass sequentially through the vertical plate of the L-shaped plate, the angle adjustment plate, and the arc-shaped hole on the back plate, and the end of the connecting bolt is connected to a lock nut.

7. The powder electrostatic accumulation characteristic tester according to claim 1, characterized in that, The experimental chamber is equipped with a door panel, and both the door panel and the walls of the experimental chamber include an electromagnetic shielding layer, a heat insulation layer, and an electrostatic protection layer arranged sequentially from the inside out.

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