Device and method for dust explosion test

Abstract

The invention relates to a device and method for a dust explosion test. The device mainly comprises a base, a thick-wall glass cylinder arranged on the base, a piston type sliding block slidably arranged in the cylinder, a linkage locking pin used for locking the position of the sliding block and a dust cup installed on the sliding block. An air inlet communicated with the dust cup is formed in the bottom of the sliding block, an ignition assembly is arranged above the sliding block, and an electrode contact rod is arranged below the sliding block. And an elastic contact sheet connected with an external power supply is mounted on the base. When the sliding block freely falls from the top end of the cylinder, a sample in the dust cup is raised in a weightlessness state to form dust cloud, meanwhile, the electrode contact rod makes contact with the elastic contact piece to be connected with a power source, and the ignition assembly generates high temperature to instantly ignite dust. Compared with the prior art, by optimizing the dust dispersion mode and the ignition mechanism, the defects that a traditional Hartmann tube device is uneven in dispersion and high in energy loss are overcome, and the device has the advantages of being simple in structure, convenient to operate, high in testing accuracy and the like.

Description

Technical Field

[0001] This invention relates to the field of dust explosion testing technology, and in particular to an apparatus and method for predicting dust explosions. Background Technology

[0002] A dust explosion refers to the phenomenon where combustible dust suspended in an oxidizing gas (usually air), within a specific concentration range, rapidly combusts upon encountering an ignition source, releasing a large amount of heat and gas, resulting in a rapid pressure rise and a destructive explosion within a confined space. Predicting dust explosiveness is a crucial aspect of industrial safety. Its main purpose is to assess the likelihood of dust explosions under specific conditions, preparing for subsequent safety design and risk assessment.

[0003] Currently, the primary method for predicting dust explosiveness is the use of the Hartmann tube test apparatus. The Hartmann tube, as a dust explosiveness testing device, is widely used due to its simple structure and low cost. However, it also suffers from drawbacks such as poor dust dispersion quality and high energy loss. Specifically, the Hartmann tube relies on a single-point airflow jet at the bottom to disperse dust, resulting in insufficient uniformity of dust dispersion; furthermore, a large amount of energy in the ignition system is dissipated in the circuitry, leaving relatively little energy for electrode ignition, leading to low energy utilization. These shortcomings result in poor repeatability and insufficient accuracy of the test results.

[0004] In the prior art, other dust explosion testing devices have also failed to effectively solve the above-mentioned problems. For example, the prior art with publication number CN109557277A discloses a gas and dust combustion and explosion characteristic testing device, which uses a spring-loaded push-pull rod to control a moving piston to adjust the pressure inside the explosion chamber and uses an electromagnetic valve sample introduction system and an electric ignition device. However, this device still relies on a centralized sample introduction method, resulting in limited improvement in dust dispersion uniformity, and the ignition system does not optimize energy loss, thus failing to overcome the bottleneck of Hartmann tubes in dispersion and energy utilization. Similarly, the prior art with publication number CN109147523A discloses a device for simulating dust explosions, which uses an air pump to blow dust and an electric ignition tube for ignition. Although it emphasizes remote control and safety, the dust dispersion method is similar to the single-point airflow of a Hartmann tube, which easily leads to uneven dust cloud concentration, and the problem of ignition energy loss remains unresolved.

[0005] In summary, the uneven dust dispersion and high energy loss of traditional Hartmann tube devices remain key technical issues restricting the accuracy and efficiency of dust explosiveness testing. Summary of the Invention

[0006] To overcome the problems of poor dust dispersion quality and low energy utilization in current Hartmann tube testing devices, a dust explosion prediction device is provided. By optimizing the dust dispersion method and ignition mechanism, the device overcomes the shortcomings of uneven dispersion and high energy loss of traditional Hartmann tube devices. It also has the advantages of simple structure, convenient operation and high testing accuracy, providing a reliable means for predicting dust explosiveness.

[0007] The objective of this invention can be achieved through the following technical solutions: The first aspect of this invention provides an apparatus for dust explosion testing, comprising a base, a thick-walled glass cylinder, a piston-type slider, a linkage locking pin, a dust cup, an electrode contact rod, an ignition assembly, and an elastic contact sheet, wherein specifically: A thick-walled glass cylinder is placed on the base to form a closed testing space; The piston-type slider is slidably disposed inside the thick-walled glass cylinder; The linkage locking pin is used to lock the slider at the top position of the thick-walled glass cylinder; A dust cup is mounted on a piston-type slider to hold the dust sample to be tested. The bottom of the piston-type slider is provided with an air inlet, which is connected to the bottom of the dust cup. The electrode contact rod is located below the piston-type slider; An ignition assembly is located above the piston-type slider, and the ignition assembly is electrically connected to the electrode contact rod. An elastic contact piece is disposed on the base, and the elastic contact piece is connected to an external power supply through a circuit. As the piston-type slider descends from the top of the thick-walled glass cylinder, the dust sample to be tested in the dust cup is lifted up, the electrode contact rod contacts the elastic contact plate, the external power supply is turned on, and the ignition component generates high-temperature gas that lifts up the dust.

[0008] Furthermore, the ignition assembly includes a ceramic socket disposed on the dust cup, a detachable plug disposed on the ceramic socket, and a tungsten wire connected to the plug.

[0009] Furthermore, the ceramic socket is connected to the electrode contact rod via a circuit; The ceramic socket is provided with a socket, and the plug is detachably inserted into the socket, so that the tungsten wire on the plug is electrically connected to the electrode contact rod.

[0010] Furthermore, the elastic contact piece is provided with two parts, which are respectively connected to the neutral wire and the live wire of the AC power supply through wires; The electrode contact rod is provided in two parts, each corresponding to one of the two elastic contact pieces.

[0011] Furthermore, the piston-type slider is provided with multiple dust cups, and the bottom of the piston-type slider is provided with multiple air inlets that match the dust cups; The piston-type slider has a pin groove on its side wall, which can match the linkage locking pin to achieve the position locking of the piston-type slider.

[0012] Furthermore, the device for dust explosion testing also includes a gear and rack linkage mechanism located at the top of the thick-walled glass cylinder; The two linkage locking pins are respectively located on both sides of the top of the thick-walled glass cylinder; Both of the aforementioned linkage locking pins are connected to the gear and rack linkage mechanism. The gear and rack linkage mechanism can drive the two linkage locking pins to approach or move away from each other in the radial direction of the thick-walled glass cylinder. When the two linkage locking pins approach each other, they can match the pin grooves to lock the position of the piston slider. When the two linkage locking pins move away from each other, the piston slider can be released and fall downwards.

[0013] Furthermore, the gear and rack linkage mechanism includes a gear, a rotating shaft, a first rack, and a second rack; The first rack and the second rack are arranged in parallel, and the gear is disposed between the first rack and the second rack. Each of the first rack and the second rack has a tooth groove on its opposite side. The tooth grooves are evenly arranged along the length direction of the first rack and the second rack, and the tooth grooves mesh with the gear. Both the first rack and the second rack are connected to a linkage locking pin, and both the first rack and the second rack are perpendicular to the linkage locking pin. The rotating shaft is connected to the middle of the gear. When the rotating shaft is rotated, the gear can rotate, thereby causing the two linkage locking pins to move closer or further apart. The shaft is rotated manually by the operator. or, The rotating shaft is driven by a servo motor, which is connected to a computer terminal.

[0014] A second aspect of the present invention provides a method for dust explosion testing, implemented using the apparatus for dust explosion testing as described above, specifically including the following steps: S1. Lift the piston slider to the top of the thick-walled glass cylinder, rotate the shaft to drive the gear and rack linkage mechanism so that the linkage locking pin is inserted into the pin groove and the slider position is locked. S2. Add the dust sample to be tested into the dust cup, and keep the empty dust cup open to adjust the dust concentration; S3. Insert the plug into the ceramic socket to position the tungsten wire, turn on the external power supply, and adjust and record the voltage and current of the external power supply. S4. Rotate the shaft to release the linkage locking pin. The piston slider falls freely under gravity. During the fall, compressed air enters the dust cup through the air inlet and blows away the dust to form a uniform dust cloud. S5: When the piston slider falls to the bottom of the base, the electrode contact rod contacts the elastic contact piece, connecting the power supply. The tungsten wire instantly oxidizes and melts, generating high temperature, igniting the dust cloud, and performing an explosion test prediction.

[0015] Furthermore, in S3, the adjustment and monitoring of the external power supply includes: setting adjustable output voltage and current to control ignition energy, and recording voltage (U) and current (I) curves in real time, and calculating the released energy value using integration; In S5, the process of conducting explosion test prediction includes: qualitatively judging the explosiveness of dust by observing whether the dust cloud inside the thick-walled glass cylinder is ignited, the flame propagation pattern, or the explosion phenomenon.

[0016] Furthermore, methods for dust explosion testing also include: The voltage-current curves, calculated energy values, test parameters, and observation results of each test are stored together and compared and analyzed through a computer terminal to optimize the parameter settings for subsequent tests.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) The device has a simple and compact structure. Its core test space is made of a thick-walled glass cylinder. This transparent structure makes it easy for the experimenter to clearly observe the formation process, dispersion morphology and subsequent combustion or explosion phenomena of dust cloud under the action of airflow, providing intuitive and reliable observation conditions for the qualitative judgment of dust explosiveness.

[0018] (2) Compared with the traditional Hartmann tube that relies on a single point of airflow at the bottom, the present invention creatively adopts a dispersion method in which a piston-type slider carries the dust cup in a free fall. When the slider falls, the air at the bottom enters the dust cup at high speed through the air inlet, so that the dust sample is evenly lifted in a near-weightless state, which greatly improves the dispersion uniformity of the dust cloud and lays an ideal foundation for subsequent ignition tests.

[0019] (3) In terms of ignition, a tungsten filament is used as the ignition source, which is detachably installed on a ceramic socket via a plug. During ignition, the current acts directly on the tungsten filament, causing it to oxidize and melt, generating high temperature. The energy is concentrated and the loss is low. The ignition source is stable and reliable, while reducing the manufacturing and maintenance costs of the device. Attached Figure Description

[0020] Figure 1 This is a plan view of the present invention; Figure 2 This is a top view of the present invention.

[0021] In the diagram: 1-Piston slider; 2-Dust cup; 3-Linkage locking pin; 4-Thick-walled glass cylinder; 5-Pin groove; 6-Electrode contact rod; 7-Elastic contact piece; 8-Ceramic socket; 9-Plug; 10-Tungsten wire; 11-Base; 12-Air inlet; 13-Gear and shaft; 14-Gear and rack linkage mechanism; 15-Guide rail; 16-Locking pin. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, circuit structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0023] Example 1 The device for dust explosion testing in this embodiment includes a base 11, a thick-walled glass cylinder 4, a piston-type slider 1, a linkage locking pin 3, a dust cup 2, an electrode contact rod 6, an ignition assembly, and an elastic contact piece 7, as detailed below. Figure 1 and Figure 2 .

[0024] A thick-walled glass cylinder 4 is mounted on the base 11, forming a closed testing space. A piston-type slider 1 is slidably mounted inside the thick-walled glass cylinder 4. A linkage locking pin 3 is used to lock the slider 1 at the top of the thick-walled glass cylinder 4. A dust cup 2 is mounted on the piston-type slider 1 to hold the dust sample to be tested. The bottom of the piston-type slider 1 is provided with an air inlet 12, which communicates with the bottom of the dust cup 2. An electrode contact rod 6 is located below the piston-type slider 1. An ignition assembly is located above the piston-type slider 1 and is electrically connected to the electrode contact rod 6. An elastic contact piece 7 is mounted on the base 11 and is connected to an external power source via a circuit. When the piston-type slider 1 falls from the top of the thick-walled glass cylinder 4, the dust sample to be tested in the dust cup 2 is lifted up. The electrode contact rod 6 contacts the elastic contact piece 7, connecting the external power source. The ignition assembly generates high-temperature combustion gas, which lifts the dust sample.

[0025] In specific implementation, the ignition assembly includes a ceramic socket 8 disposed on the dust cup 2, a detachable plug 9 disposed on the ceramic socket 8, and a tungsten wire 10 connected to the plug 9. The ceramic socket 8 is connected to the electrode contact rod 6 via a circuit; the ceramic socket 8 is provided with a insertion slot, and the plug 9 is detachably inserted into the insertion slot, so that the tungsten wire 10 on the plug 9 is electrically connected to the electrode contact rod 6. Two elastic contact pieces 7 are provided, which are respectively connected to the neutral wire and the live wire of the AC power supply via wires; two electrode contact rods 6 are provided, each corresponding to one of the two elastic contact pieces 7.

[0026] In specific implementation, the piston slider 1 is provided with multiple dust cups 2, and the bottom of the piston slider 1 is provided with multiple air inlets 12 that match the dust cups 2; the side wall of the piston slider 1 is provided with a pin groove 5, which can match the linkage locking pin 3, thereby realizing the position locking of the piston slider 1.

[0027] In specific implementation, the device for dust explosion testing also includes a gear and rack linkage mechanism 14 located at the top of the thick-walled glass cylinder 4; two linkage locking pins 3 are respectively located on both sides of the top of the thick-walled glass cylinder 4; both linkage locking pins 3 are connected to the gear and rack linkage mechanism 14, and the gear and rack linkage mechanism 14 can drive the two linkage locking pins 3 to approach or move away from each other in the radial direction of the thick-walled glass cylinder 4. When the two linkage locking pins 3 approach each other, they can match with the pin groove 5 to lock the position of the piston slider 1. When the two linkage locking pins 3 move away from each other, the piston slider 1 can be released and fall downwards.

[0028] In specific implementation, the gear and rack linkage mechanism 14 includes a gear 19, a rotating shaft 13, a first rack 17, and a second rack 18. The first rack 17 and the second rack 18 are arranged in parallel, and the gear 19 is located between the first rack 17 and the second rack 18. Each of the first rack 17 and the second rack 18 has a tooth groove on its opposite side. The tooth grooves are evenly arranged along the length direction of the first rack 17 and the second rack 18, and the tooth grooves mesh with the gear 19. Each of the first rack 17 and the second rack 18 is connected to a linkage locking pin 3, and the first rack 17 and the second rack 18 are both arranged perpendicular to the linkage locking pin 3. The rotating shaft 13 is connected to the middle of the gear 19. When the rotating shaft 13 is rotated, the gear 19 can rotate, thereby driving the two linkage locking pins 3 to move closer or further apart. The rotating shaft 13 is manually rotated by the operator.

[0029] The principle of the dust explosion testing device in this embodiment is as follows: First, the piston-type slider 1 is lifted to the top of the thick-walled glass cylinder 4, and the linkage locking pin 3 is driven by the gear and rack linkage mechanism 14 to be inserted into the pin groove 5 on the side wall of the slider to lock the position; then, the dust sample to be tested is added to the dust cup 2; then, the rotating shaft 13 is rotated to make the gear 19 rotate, which drives the first rack 17 and the second rack 18 to move, thereby causing the linkage locking pin 3 to disengage from the pin groove 5 and releasing the piston-type slider 1; the slider 1 falls freely under gravity, and during the fall, the air at the bottom enters the dust cup 2 through the air inlet 12, blowing away the dust to form a uniform dust cloud; when the slider 1 falls to the bottom of the base 11, the electrode contact rod 6 contacts the elastic contact piece 7, connecting the external power supply, and the current is transmitted through the electrode contact rod 6 to the plug 9 on the ceramic socket 8, causing the tungsten wire 10 to oxidize and melt instantly, generating high temperature, thereby igniting the dust cloud and completing the explosion test prediction.

[0030] Example 2 This embodiment provides a method for dust explosion testing, implemented using the apparatus described above for dust explosion testing, and specifically includes the following steps: S1. Lift the piston slider 1 to the top of the thick-walled glass cylinder 4, rotate the rotating shaft 13, thereby driving the gear and rack linkage mechanism 14 to insert the linkage locking pin 3 into the pin groove 5 and lock the position of the slider 1.

[0031] S2. Add the dust sample to be tested to dust cup 2, and keep the empty dust cup 2 open to adjust the dust concentration.

[0032] S3. Insert plug 9 into ceramic socket 8 to position tungsten wire 10, turn on external power, and adjust and record the voltage and current of external power. In S3, the adjustment and monitoring of external power includes: setting adjustable output voltage and current to control ignition energy, recording voltage (U) and current (I) curves in real time, and calculating the released energy value using integration.

[0033] S4. Rotate the shaft 13 to release the linkage locking pin 3. The piston slider 1 falls freely under gravity. During the fall, compressed air enters the dust cup 2 through the air inlet 12 and blows away the dust to form a uniform dust cloud. S5: When the piston slider 1 falls to the bottom of the base 11, the electrode contact rod 6 contacts the elastic contact piece 7, and the power is turned on. The tungsten wire 10 instantly oxidizes and melts, generating high temperature, igniting the dust cloud, and conducting an explosion test prediction.

[0034] In S5, the process of conducting explosion test prediction includes: qualitatively judging the explosiveness of the dust by observing whether the dust cloud inside the thick-walled glass cylinder 4 is ignited, the flame propagation pattern, or the explosion phenomenon.

[0035] Methods for dust explosion testing also include: storing the voltage-current curves, calculated energy values, test parameters, and observation results of each test in association, and performing data comparison and analysis through a computer terminal to optimize parameter settings for subsequent tests.

[0036] In practical implementation, the test method in this embodiment has unique advantages in the dust dispersion stage. When the operator rotates the shaft 13 to release the linkage locking pin 3, the piston slider 1 falls freely under gravity. During the fall, the air at the bottom is compressed and enters the dust cup 2 at high speed through the air inlet 12. This design simulates a weightless environment, which allows the dust sample to be raised more evenly to form a dust cloud, providing ideal conditions for subsequent ignition tests.

[0037] In terms of ignition energy control, the method in this embodiment precisely adjusts the output voltage and current through an external power supply, records the voltage U and current I curves in real time, and calculates the actual released energy value using integration. When the piston slider 1 falls to the bottom of the base 11, the electrode contact rod 6 contacts the elastic contact piece 7 to connect the circuit. The current flows through the ceramic socket 8 to the tungsten wire 10 on the plug 9, causing it to oxidize and melt instantly to generate high temperature, ensuring that the ignition energy is concentrated on the dust cloud.

[0038] The method in this embodiment also integrates advanced data management functions. The voltage and current curves, calculated energy values, dust concentration parameters and observation results of each test are all stored together. The computer terminal compares and analyzes the historical data to identify the influence of different test parameters on the explosion phenomenon, thereby providing an optimization basis for the dust sample quantity and ignition energy settings in subsequent experiments, and significantly improving the accuracy and efficiency of the test.

[0039] Example 3 The rotating shaft 13 is driven by a servo motor, which is connected to a computer terminal for communication.

[0040] This embodiment further optimizes the level of automation control of the testing device. The rotating shaft 13 is driven by a servo motor, which establishes a communication connection with the computer terminal, enabling remote control and programmed operation of the entire testing process. The computer terminal can precisely control the timing and angle of the rotation of the rotating shaft 13, thereby accurately driving the insertion and release of the linkage locking pin 3 through the gear and rack linkage mechanism 14, ensuring the consistency of the piston slider 1's descent time, and greatly improving the repeatability and reliability of the test.

[0041] The computer terminal can preset and send commands to the servo motor to control the rotation of the rotating shaft 13, thereby controlling the locking and releasing of the linkage locking pin 3 on the piston slider 1. At the same time, the computer terminal can work in conjunction with the external power supply system that records the voltage U and current I curves to automatically collect ignition energy data for each test and store it in association with the observation results, providing a data foundation for establishing a quantitative relationship model between dust explosiveness and ignition energy.

[0042] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. An apparatus for dust explosion testing, characterized in that, include: Base (11); A thick-walled glass cylinder (4) is placed on the base (11) to form a closed test space; A piston-type slider (1) is slidably disposed inside a thick-walled glass cylinder (4); Linkage locking pin (3) is used to lock the slider (1) at the top position of the thick-walled glass cylinder (4); A dust cup (2) is mounted on a piston slider (1) and is used to hold the dust sample to be tested. The bottom of the piston slider (1) is provided with an air inlet (12), which is connected to the bottom of the dust cup (2). The electrode contact rod (6) is located below the piston-type slider (1); An ignition assembly is located above the piston-type slider (1), and the ignition assembly is electrically connected to the electrode contact rod (6); An elastic contact piece (7) is provided on the base (11), and the elastic contact piece (7) is connected to an external power source through a circuit; When the piston slider (1) falls from the top of the thick-walled glass cylinder (4), the dust sample to be tested in the dust cup (2) is lifted up, the electrode contact rod (6) contacts the elastic contact piece (7), the external power supply is turned on, and the ignition assembly generates high-temperature gas to lift the dust.

2. The apparatus for dust explosion testing according to claim 1, characterized in that, The ignition assembly includes a ceramic socket (8) on the dust cup (2), a detachable plug (9) on the ceramic socket (8), and a tungsten wire (10) connected to the plug (9).

3. The apparatus for dust explosion testing according to claim 2, characterized in that, The ceramic socket (8) is connected to the electrode contact rod (6) via a circuit; The ceramic socket (8) is provided with a socket groove, and the plug (9) is detachably plugged into the socket groove, so that the tungsten wire (10) on the plug (9) is electrically connected to the electrode contact rod (6).

4. The apparatus for dust explosion testing according to claim 2, characterized in that, The elastic contact piece (7) has two parts, which are respectively connected to the neutral wire and the live wire of the AC power supply through wires; The electrode contact rod (6) is provided in two parts, which correspond to two elastic contact pieces (7) respectively.

5. The apparatus for dust explosion testing according to claim 1, characterized in that, The piston slider (1) is provided with multiple dust cups (2), and the bottom of the piston slider (1) is provided with multiple air inlets (12) that match the dust cups (2). The piston slider (1) has a pin groove (5) on its side wall. The pin groove (5) can match the linkage locking pin (3) to achieve the position locking of the piston slider (1).

6. The apparatus for dust explosion testing according to claim 5, characterized in that, The device for dust explosion testing also includes a gear and rack linkage mechanism (14) located at the top of the thick-walled glass cylinder (4). The two linkage locking pins (3) are respectively located on both sides of the top of the thick-walled glass cylinder (4); Both of the linkage locking pins (3) are connected to the gear and rack linkage mechanism (14). The gear and rack linkage mechanism (14) can drive the two linkage locking pins (3) to approach or move away from each other in the radial direction of the thick-walled glass cylinder (4). When the two linkage locking pins (3) approach each other, they can match the pin groove (5) to lock the position of the piston slider (1). When the two linkage locking pins (3) move away from each other, the piston slider (1) can be released and fall downward.

7. The apparatus for dust explosion testing according to claim 6, characterized in that, The gear and rack linkage mechanism (14) includes a gear (19), a rotating shaft (13), a first rack (17), and a second rack (18). The first rack (17) and the second rack (18) are arranged in parallel, and the gear (19) is located between the first rack (17) and the second rack (18). The first rack (17) and the second rack (18) are provided with tooth grooves on opposite sides. The tooth grooves are evenly arranged along the length direction of the first rack (17) and the second rack (18), and the tooth grooves mesh with the gear (19). A linkage locking pin (3) is connected to both the first rack (17) and the second rack (18), and both the first rack (17) and the second rack (18) are set perpendicular to the linkage locking pin (3); The rotating shaft (13) is connected to the middle of the gear (19). When the rotating shaft (13) is rotated, the gear (19) can rotate, thereby driving the two linkage locking pins (3) to move closer or further apart. The rotating shaft (13) is rotated manually by the operator; or, The rotating shaft (13) is driven by a servo motor, which is connected to a computer terminal for communication.

8. A method for dust explosion testing, characterized in that, Implemented using the apparatus described in any one of claims 1 to 7, specifically including the following steps: S1. Lift the piston slider (1) to the top of the thick-walled glass cylinder (4), rotate the shaft (13) to drive the gear rack linkage mechanism (14) so ​​that the linkage locking pin (3) is inserted into the pin groove (5) to lock the position of the slider (1). S2. Add the dust sample to be tested into the dust cup (2), and keep the empty dust cup (2) open to adjust the dust concentration; S3. Insert the plug (9) into the ceramic socket (8) to put the tungsten wire (10) in place, turn on the external power supply, and adjust and record the voltage and current of the external power supply. S4. Rotate the shaft (13) to release the linkage locking pin (3), and the piston slider (1) falls freely by gravity. During the fall, compressed air enters the dust cup (2) through the air inlet (12) and blows away the dust to form a uniform dust cloud. S5: When the piston slider (1) falls to the bottom of the base (11), the electrode contact rod (6) contacts the elastic contact piece (7), the power is turned on, the tungsten wire (10) instantly oxidizes and melts to generate high temperature, ignites the dust cloud, and conducts an explosion test prediction.

9. A method for dust explosion testing according to claim 8, characterized in that, In S3, the adjustment and monitoring of the external power supply includes: setting adjustable output voltage and current to control ignition energy, and recording voltage (U) and current (I) curves in real time, and calculating the released energy value using integration; In S5, the process of conducting explosion test prediction includes: qualitatively judging the explosiveness of dust by observing whether the dust cloud inside the thick-walled glass cylinder (4) is ignited, the flame propagation pattern or explosion phenomenon.

10. A method for dust explosion testing according to claim 8, characterized in that, Also includes: The voltage-current curves, calculated energy values, test parameters, and observation results of each test are stored together and compared and analyzed through a computer terminal to optimize the parameter settings for subsequent tests.

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