Continuous, uniform and adjustable ultra-high metal concentration dust quantitative diffusion system

Abstract

The invention relates to a continuous, uniform and adjustable quantitative diffusion system for dust with ultrahigh metal concentration, and belongs to the field of construction of a uniform diffusion environment for high-concentration metal dust. The system comprises a screw rod feeding pipe machine, an adjustable motor I, a motor controller I, a motor controller II, an adjustable motor II, a vibrating screen, a metal cylinder, a platform, a dust concentration sampler, a dust quality sensor and a dust collecting bin. According to the invention, a uniform and continuous distribution test environment of metal dust which is relatively high in density and difficult to diffuse in air is constructed, so that the construction of a high-concentration dust uniform dispersion experiment platform is realized, and the problems of inspection and verification of high-concentration metal dust detection equipment are solved; and a foundation is provided for research, development and inspection of high-concentration metal dust concentration detection equipment, so that the stability and reliability of an on-site metal dust concentration sensor and the detection equipment are ensured.

Description

Technical Field

[0001] The invention belongs to the field of high-concentration metal dust uniform diffusion environment construction, and relates to a continuous, uniform and adjustable ultra-high metal concentration dust quantitative diffusion system. Background Art

[0002] In recent years, metal dust explosions have become common, causing significant economic losses, casualties and adverse social impacts. Therefore, accurate detection of metal dust concentrations in the workplace is indispensable, especially high-concentration metal dust that reaches the lower explosion limit. However, it is difficult for the metal dust concentration on site to achieve uniform distribution and continuous stability, so it is impossible to verify the effectiveness and reliability of metal dust concentration detection equipment on site. Therefore, a uniformly distributed and adjustable concentration metal dust environment in the laboratory is indispensable. A uniformly distributed and adjustable concentration dust environment is also a prerequisite for the research and development of dust concentration detection equipment and the testing of the accuracy of dust concentration detection equipment. At present, the uniformly distributed and adjustable concentration dust environment is mainly a uniform distribution device for non-metallic dusts such as coal dust and talcum powder, and the test concentrations are all lower than 2000mg / m 3 ,However, uniform distribution and adjustable concentration of metal dust have not been developed yet. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a continuous, uniform and adjustable ultra-high metal concentration dust quantitative diffusion system to solve the inspection problem of wide-range metal dust concentration detection equipment, and develop a large-range, high-concentration metal dust uniform diffusion experimental device. This device mainly adopts a high-precision quantitative dust feeding device, rapid vibration uniform dispersion, and distributed quantitative real-time monitoring technology to lay an experimental foundation for achieving high-precision monitoring of metal dust.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A continuous, uniform and adjustable ultra-high metal concentration dust quantitative diffusion system, comprising a screw feeder tube machine 1, an adjustable motor Ⅰ2, a motor controller Ⅰ3, a motor controller Ⅱ4, an adjustable motor Ⅱ5, a vibrating screen 6, a metal cylinder 7, a platform 8, a dust concentration sampler 9, a dust quality sensor 10 and a dust collection bin 11;

[0006] The motor controller I3 is connected to the dust concentration sampler 9 and the adjustable motor I2 respectively, and controls the start and stop of the adjustable motor I2 according to the dust concentration signal obtained by the dust concentration sampler 9; the motor controller II4 is connected to the dust mass sensor 10 and the vibrating screen 6 respectively, and controls the start and stop of the adjustable motor II5 according to the dust mass obtained by the dust mass sensor 10.

[0007] Under the rotation of the adjustable motor Ⅰ2, the dust is uniformly transported from the screw feeder 1 to the round metal cylinder 7. Since the metal dust is heavy, it is difficult to disperse evenly in the air and can only fall freely by its own gravity. The faster the screw conveyor rotates, the more dust is poured into the metal cylinder 7, and the greater the dust concentration in the metal cylinder 7. The metal dust is first poured onto the vibrating screen 6 in the metal cylinder 7. Under the action of the vibrating screen 6, the dust is evenly dispersed in the metal cylinder 7. The stronger the vibration of the vibrating screen 6, the more evenly the dust is dispersed. After passing through the vibrating screen 6, the dust falls evenly and freely under the action of gravity, and passes through the detection area in the middle of the metal cylinder 7. A dust concentration sampler 9 is placed in the detection area. and platform 8, the dust concentration sampler 9 is used to obtain the dust concentration in the detection area in real time, and the platform 8 is used to place the dust detection equipment to be detected; the dust enters the collection area after passing through the detection area, and n dust mass sensors 10 are evenly distributed in the collection area. By analyzing whether the mass of dust settled on the surface of n dust mass sensors 10 is uniform, the dust distribution in the metal cylinder 7 is judged; if the dust distribution in the collection area is uniform, the dust concentration detector to be detected is started; if it is uneven, the adjustable motor II 5 is started; the dust collection bin 11 is located below the dust mass sensor 10, and finally the dust falls into the dust collection bin 11, and the dust in the dust collection bin 11 is regularly taken out for secondary utilization.

[0008] Furthermore, the control process of the system is as follows: when the system starts, the dust concentration value C0 and the uniformity parameter S0 in the metal cylinder 7 are set; then the adjustable motor Ⅰ2 is turned on, the screw feeder 1 is started, and the dust is input into the metal cylinder 7 under the action of the screw feeder 1, and then the adjustable motor Ⅱ5 is turned on, the vibrating screen 6 is started, and under the action of the vibrating screen 6, the dust is evenly dispersed, and the dust passes through the detection area. The dust concentration sampler 9 collects metal dust to obtain the dust concentration C, and judges whether C is equal to the set C0. If it is greater, the speed of the adjustable motor Ⅰ2 is lowered to reduce the dust concentration conveying amount. If it is less than, the speed of the adjustable motor Ⅰ2 is increased to increase the dust concentration conveying amount. After the adjustment is completed, the dust quality sensors 10 evenly distributed in the collection area at the bottom of the metal cylinder 7 collect data, and the test value of each sensor is a=[a1, a2, a3, ..., a n ], through the formula Calculate the distribution uniformity S of the numerical value to determine whether the dust distribution in the metal cylinder 7 is uniform. If the calculated value exceeds the uniformity S0 set initially, increase the speed of the adjustable motor II5, increase the vibration frequency of the vibrating screen 6, and improve the uniformity of dust distribution until the requirements are met. After the parameter setting is completed and the dust in the metal cylinder 7 is evenly distributed, start the dust concentration detection equipment to be tested to check its performance parameters of accuracy and stability.

[0009] The beneficial effects of the present invention are as follows: the present invention constructs a uniform and continuous distribution test environment for metal dust with relatively high density and difficult to diffuse in the air, realizes the construction of a high-concentration dust uniform dispersion experimental platform, solves the problem of inspection and calibration of high-concentration metal dust detection equipment, and provides a basis for the research and development and inspection of high-concentration metal dust concentration detection equipment, thereby ensuring the stability and reliability of on-site metal dust concentration sensors and detection equipment.

[0010] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0012] Figure 1 This is a schematic diagram of the installation of the ultra-high metal concentration dust quantitative diffusion system of the present invention;

[0013] Figure 2 This is a functional schematic diagram of the ultra-high metal concentration dust quantitative diffusion system of the present invention;

[0014] Figure 3 This is a signal processing flow chart of the ultra-high metal concentration dust quantitative diffusion system of the present invention.

[0015] Figure numerals: 1-screw feeder, 2-adjustable motor I, 3-motor controller I, 4-motor controller II, 5-adjustable motor II, 6-vibrating screen, 7-metal cylinder, 8-platform, 9-dust concentration sampler, 10-dust quality sensor, 11-dust collection bin. DETAILED DESCRIPTION

[0016] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0017] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0018] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0019] See also Figure 1 to Figure 3 The present invention provides a continuous, uniform and adjustable ultra-high metal concentration dust quantitative diffusion system, the specific structure of which is as follows Figure 1 The system includes a screw feeder 1, an adjustable motor Ⅰ2, a motor controller Ⅰ3, a motor controller Ⅱ4, an adjustable motor Ⅱ5, a vibrating screen 6, a metal cylinder 7, a platform 8, a dust concentration sampler 9, a dust quality sensor 10 and a dust collection bin 11.

[0020] Under the action of the adjustable motor Ⅰ2, the dust is uniformly transported from the screw feeder 1 to the round metal cylinder 7. Since the metal dust is heavy, it is difficult to disperse evenly in the air, and it can only fall freely by its own gravity. The faster the screw feeder 1 rotates, the more dust is poured into the metal cylinder 7, and the greater the dust concentration in the metal cylinder 7. The metal dust is first poured onto the vibrating screen 6 in the metal cylinder 7. Under the action of the vibrating screen 6, the dust is evenly dispersed in the metal cylinder 7. The stronger the vibration of the vibrating screen 6, the more evenly the dust is dispersed. After passing through the vibrating screen 6, the dust falls evenly and freely under the action of gravity, passing through the detection area in the middle of the metal cylinder 7. The detection area is placed with a dust concentration sampler 9, which can be weighed and sampled to obtain the distribution concentration of the dust. At the same time, the dust detection equipment to be tested is placed on the platform 8 in this area for comparison to test the accuracy and stability of the dust concentration detection equipment. After passing through the detection area, the dust enters the collection area. 40 dust mass sensors 10 are evenly distributed in the collection area. The dust distribution in the metal cylinder 7 is determined by analyzing whether the dust mass settled on the surface of the 40 dust mass sensors 10 is uniform. The calculation formula is based on S0. Finally, the dust falls into the dust collection bin 11. For secondary use, the dust in the dust collection bin 11 is taken out regularly.

[0021] like Figure 3 As shown in the figure, the signal processing flow of the system is:

[0022] When the system starts, the dust concentration value C0 and the uniformity parameter S0 in the metal cylinder 7 are set; then the adjustable motor Ⅰ2 is turned on, and the screw feeder 1 is started. The dust is input into the metal cylinder 7 under the action of the screw feeder 1, and then the adjustable motor Ⅱ5 is turned on, and the vibrating screen 6 is started. Under the action of the vibrating screen 6, the dust is evenly dispersed, and the dust passes through the detection area. The dust concentration sampler 9 collects metal dust to obtain the dust concentration C, and judges whether C is equal to the set C0. If it is too large, the speed of the adjustable motor Ⅰ2 is lowered to reduce the dust concentration conveying amount. If it is too small, the speed of the adjustable motor Ⅰ2 is increased to increase the dust concentration conveying amount. After the adjustment is completed, the dust quality sensor 10 evenly distributed in the collection area at the bottom of the metal cylinder 7 collects data. The test value of each sensor is a=[a1,a2,a3,……,a 40 ], calculate the distribution uniformity S of the value through formula (1), and judge whether the dust distribution in the metal cylinder 7 is uniform. If the calculated value exceeds the uniformity S0 set initially, increase the speed of the adjustable motor II5, increase the vibration frequency of the vibrating screen 6, and improve the uniformity of dust distribution until the requirement is met. After the parameter setting is completed and the dust in the metal cylinder 7 is evenly distributed, start the dust concentration detection equipment to be tested to check its performance parameters of accuracy and stability.

[0023]

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A continuous, uniform and adjustable ultra-high metal concentration dust quantitative diffusion system, characterized in that: The system comprises: a screw feeder (1), an adjustable motor I (2), a motor controller I (3), a motor controller II (4), an adjustable motor II (5), a vibrating screen (6), a metal cylinder (7), a platform (8), a dust concentration sampler (9) and a dust quality sensor (10); Under the rotation of the adjustable motor Ⅰ (2), the dust is uniformly transported from the screw feeder (1) to the round metal cylinder (7); the metal dust is first poured onto the vibrating screen (6) in the metal cylinder (7), and under the action of the vibrating screen (6), the dust is evenly dispersed in the metal cylinder (7). The stronger the vibration of the vibrating screen (6), the more evenly the dust is dispersed. After passing through the vibrating screen (6), the dust falls evenly and freely under the action of gravity, and passes through the detection area in the middle of the metal cylinder (7). The detection area is provided with a dust concentration sampler (9) and a platform. (8), the dust concentration sampler (9) is used to obtain the dust concentration in the detection area in real time, and the platform (8) is used to place the dust detection equipment to be detected; after passing through the detection area, the dust enters the collection area, and n dust mass sensors (10) are evenly distributed in the collection area. By analyzing whether the mass of dust settled on the surface of the n dust mass sensors (10) is uniform, the dust distribution in the metal cylinder (7) is judged; if the dust distribution in the collection area is uniform, the dust concentration detector to be detected is started; if it is uneven, the adjustable motor II (5) is started.

2. The ultra-high metal concentration dust quantitative diffusion system according to claim 1 is characterized in that: The motor controller I (3) is connected to the dust concentration sampler (9) and the adjustable motor I (2) respectively, and controls the start and stop of the adjustable motor I (2) according to the dust concentration signal obtained by the dust concentration sampler (9); The motor controller II (4) is connected to the dust mass sensor (10) and the vibrating screen (6) respectively, and controls the start and stop of the adjustable motor II (5) according to the dust mass obtained by the dust mass sensor (10).

3. The ultra-high metal concentration dust quantitative diffusion system according to claim 1 is characterized in that: The system also includes a dust collection bin (11) located below the dust mass sensor (10). The dust in the metal cylinder (7) finally falls into the dust collection bin (11). The dust in the dust collection bin (11) is taken out regularly for secondary utilization.

4. The ultra-high metal concentration dust quantitative diffusion system according to any one of claims 1 to 3, characterized in that: The control process of the system is as follows: when the system is started, the dust concentration value C0 and the uniformity parameter S0 in the metal cylinder (7) are set; then the adjustable motor I (2) is turned on, the screw feeder (1) is started, and the dust is input into the metal cylinder (7) under the action of the screw feeder (1); then the adjustable motor II (5) is turned on, the vibrating screen (6) is started, and under the action of the vibrating screen (6), the dust is evenly dispersed, and the dust passes through the detection area. The dust concentration sampler (9) collects metal dust to obtain the dust concentration C, and judges whether C is equal to the set C0. If it is greater than C0, the speed of the adjustable motor I (2) is lowered to reduce the dust concentration conveying amount. If it is less than C0, the speed of the adjustable motor I (2) is increased to increase the dust concentration conveying amount. After the adjustment is completed, the dust quality sensors (10) evenly distributed in the collection area at the bottom of the metal cylinder (7) collect data, and the test value of each sensor is a=[a1, a2, a3, ..., a n ], through the formula Calculate the distribution uniformity S of the numerical value to determine whether the dust distribution in the metal cylinder (7) is uniform. If the calculated value exceeds the uniformity S0 set initially, increase the rotation speed of the adjustable motor II (5), increase the vibration frequency of the vibrating screen (6), and improve the dust distribution uniformity until the requirement is met. After the parameter setting is completed and the dust in the metal cylinder (7) is evenly distributed, the dust concentration detection equipment to be tested is started to check its performance parameters of accuracy and stability.

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