Pipeline type powder electrostatic voltage testing device and method based on monopole antenna

Abstract

The invention discloses a pipeline type powder electrostatic voltage testing device and method based on a monopole antenna, and relates to the technical field of powder electrostatic measurement. Comprising a metal pipeline, a mounting base, a limiting flange plate and a measuring probe. A flange plate and an annular shielding layer are arranged above and below the metal pipeline for providing a test environment; the mounting base is welded on the outer side of the pipeline, the axis of the through hole is not perpendicular to the powder flowing direction, and internal threads are arranged on the inner side; the limiting flange plate is arranged outside the shell; the measuring probe comprises a shell, an insulation cap and a detection device, the insulation cap protects the detection device, a broadband special-shaped monopole antenna in the detection device captures electrostatic signals, and a signal processing circuit carries out signal processing. An environment is built, a proper mounting base is selected and connected into measuring equipment, and finally, signals are measured and processed to obtain electrostatic voltage. The testing device and method have the advantages of being convenient to install, high in measuring precision and high in stability, the electrostatic voltage of powder in the pipeline can be effectively measured, production safety is guaranteed, and product quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of powder electrostatic measurement, and particularly to a pipeline-type powder electrostatic voltage testing device and method based on a monopole antenna. Background Art

[0002] In industries such as chemical engineering, food, and pharmaceuticals, powder static electricity may cause problems such as dust explosions and product quality degradation. Therefore, accurately measuring the static charge generated by powder during pipeline transportation is of great significance for ensuring production safety and improving product quality. Currently, there are various static electricity measurement devices on the market, but for testing devices for measuring powder static electricity in pipelines, there are still many deficiencies in terms of measurement accuracy, stability, and installation convenience. For example, some traditional static electricity testing devices have complex structures, are difficult to install, and are easily affected by external interference, resulting in inaccurate measurement results.

[0003] During the transportation of powder materials, due to reasons such as the mutual friction and collision between the powder and the inner wall of the pipeline, static electricity is extremely likely to be generated. The accumulation of static electricity may cause hazards such as static discharge, posing a serious threat to production safety. Especially in the special material transportation systems in the military industry, during the pipeline transportation of flammable and explosive drugs (such as ammunition raw materials, solid propellants), toxic and harmful chemical substances (such as nuclear waste intermediates, highly toxic reagents), a large amount of static electricity will accumulate due to the friction and collision between the powder and the inner wall of the pipeline. If these static charges are not monitored and controlled in a timely manner, catastrophic consequences may occur: on the ammunition production line, static discharge can detonate gunpowder; in the rocket propellant pipeline, static electricity accumulation may cause fuel deflagration; in the nuclear chemical pipeline, the spark caused by static electricity may damage the sealing structure, resulting in radioactive substance leakage. According to military accident statistics, a flash explosion accident caused by static electricity occurred during the fuel filling process of a certain type of missile, resulting in equipment damage and casualties worth hundreds of millions of yuan. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a pipeline-type powder electrostatic voltage testing device and method that are more accurate, stable, and convenient to install.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A pipeline-type powder electrostatic voltage testing device based on a monopole antenna, the key technology thereof lies in including a metal pipeline, a mounting base, a limit flange, and a measurement probe; the mounting base is arranged on the outer wall of the metal pipeline; the measurement probe is connected to the metal pipeline through the mounting base; the limit flange is arranged outside the mounting base.

[0007] Preferably, the metal pipe is cylindrical, with two flange plates respectively arranged at the upper and lower parts, and an installation hole is arranged on one side of the pipe; an annular shielding layer is arranged inside the flange plate; the annular shielding layer is grounded through a grounding wire.

[0008] Preferably, the installation base is installed on the outer side of the metal pipe by welding. A through hole is provided at the center of the installation base and is communicated with the installation hole on the metal pipe; the inner diameter of the through hole is slightly larger than that of the installation hole; the axis of the through hole on the installation base is not perpendicular to the powder flow direction in the pipe; the inclination angle is set to 0° - 30° according to the powder flow rate.

[0009] Preferably, the measurement probe includes a housing, an insulating cap and a detection device; the housing is cylindrical and is grounded through a grounding wire; the insulating cap is arranged at one end of the housing connected to the metal pipe; the detection device is installed inside the housing and includes a broadband non - standard monopole antenna and a signal processing circuit; an external thread is arranged on the outer side of the housing; the outer surface of the insulating cap is an arc spherical surface structure, and the bottom of the insulating cap is flush with the inner wall of the pipe; the induction end of the broadband non - standard monopole antenna faces the inside of the metal pipe; the measurement probe is along the axis of the through hole on the installation base.

[0010] Preferably, a stepped reduced - diameter structure is provided at the end of the housing, and the insulating cap is fixed to the reduced - diameter structure by interference fit.

[0011] Preferably, the inner diameter of the limiting flange plate is the same as that of the through hole of the installation base, and it is connected to the housing by welding; the distance from the installation position of the limiting flange plate to the bottom of the insulating cap is the same as the length of the through hole of the installation base.

[0012] The pipeline - type powder electrostatic voltage measurement method based on a monopole antenna is completed by means of the above - mentioned electrostatic voltage measurement device, and includes the following steps:

[0013] Environmental setup stage: Use bolts to connect the powder transportation pipeline through the two flange plates on the upper and lower parts of the metal pipe, check that the sealing is good, and firmly ground the grounding wire on the metal pipe.

[0014] Measurement equipment selection: Select an installation base with a through hole at an appropriate angle according to the powder transportation speed.

[0015] Measurement equipment connection: Weld the installation base on the side of the metal pipe, align the through hole of the installation base with the installation hole, and then screw the measurement probe into the inner thread of the installation base through the external thread of the housing until the limiting flange plate is in close contact with the installation base.

[0016] Measurement stage: When the powder starts to be transported, the broadband asymmetric monopole antenna at the front end of the measurement probe will sense the change in the electrostatic field inside the pipeline and convert this change into an electrical signal. The electrical signal is transmitted to the signal processing circuit. After preprocessing by the signal processing circuit, it is sent to the computer, and the electrostatic voltage is obtained through processing by a preset algorithm.

[0017] The beneficial effects produced by adopting the above technical solutions are as follows:

[0018] In the present invention, the measurement probe is inserted into the metal pipeline at an inclined angle, which reduces the impact force of the powder flow on the measurement probe, ensures the stability of the device, and at the same time optimizes the capture efficiency of the electric field in the tangential direction, and collects the electrostatic voltage information in the powder more accurately.

[0019] In the present invention, the metal pipeline is connected to the powder transportation environment through a flange plate. The measurement probe enters the test environment by inserting. It only needs to be limited by the limit flange plate and is strengthened by using fastening bolts at the same time, and the installation process is convenient. Description of the drawings

[0020] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0021] Figure 1 is a schematic structural diagram of a pipeline-type powder electrostatic voltage test device based on a monopole antenna proposed by the present invention;

[0022] Figure 2 is Figure 1 a partial enlarged view of part A in

[0023] Description of the reference numerals in the drawings

[0024] 1. Metal pipeline; 11. Installation hole; 2. Installation base; 21. Through hole; 3. Measurement probe; 31. Shell; 32. Insulating cap; 33. Detection device; 331. Broadband asymmetric monopole antenna; 332. Signal processing circuit; 4. Limit flange plate. Specific embodiments

[0025] To make the above objects, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Such as Figure 1-2, the pipeline-type powder electrostatic voltage testing device based on a monopole antenna proposed by the present invention includes a metal pipeline 1, a mounting base 2, a limiting flange 4, and a measuring probe 3

[0027] The metal pipeline 1 is cylindrical, with two flanges provided at the upper and lower parts respectively, which are used to connect other pipelines or devices, provide a testing environment for the powder electrostatic voltage, and prevent powder leakage at the same time; there is an installation hole 11 on one side of the pipeline, which provides a passage for the installation of the measuring probe 3; annular shielding layers are provided on the inner sides of the upper and lower flanges, and their function is to resist external electromagnetic interference. In actual use, especially in an industrial production environment, there are many electromagnetic interference sources in the surrounding environment, such as electromagnetic radiation generated by large motors, transformers and other equipment. These interference signals enter the measurement system and will cause deviations in the measurement results. The annular shielding layer can, through its own conductive characteristics, guide the external electromagnetic interference to the ground through the grounding wire, so as to ensure that the signal sensed by the measuring probe 3 mainly comes from the powder in the pipeline, greatly improving the accuracy and reliability of the measurement.

[0028] The mounting base 2 is firmly installed on the outside of the metal pipeline 1 by welding. This connection method ensures the tight combination between the mounting base 2 and the metal pipeline 1 and is not easy to loosen. There is a through hole 21 in the center of the mounting base 2, and the through hole 21 communicates with the installation hole 11 on the metal pipeline 1, and the inner diameter of the through hole 21 is slightly larger than that of the installation hole 11, so that the measuring probe 3 can smoothly pass through and penetrate into the pipeline for measurement. The axis of the through hole 21 on the mounting base 2 is not perpendicular to the powder flow direction in the pipeline. The inclined welding surface and the axis of the through hole 21 not perpendicular to the powder flow direction effectively reduce the impact force of the powder flow on the measuring probe 3. When the powder flows at a high speed in the pipeline, if the measuring probe 3 directly faces the powder flow direction vertically, it will be subjected to a large impact force, which may not only affect the measurement accuracy of the measuring probe 3, but also cause damage to the measuring probe 3 and reduce the service life of the measuring probe 3; the inclination angle ranges from 0° to 30°, and is selected according to the powder flow rate in the actual test environment. For powders with higher flow rates, the inclination angle is larger; at the same time, the inclined measuring probe 3 forms an included angle between the induction direction of the monopole antenna and the electrostatic field direction generated by the powder flow, so as to optimize the capture efficiency of the tangential component of the electric field. A fastening thread is provided on the inner side of the through hole 21 of the mounting base 2. After the measuring probe 3 is installed, the relative positions of the measuring probe 3 and the base are further fixed through the close fit between the threads, enhancing the stability of the overall structure, preventing it from shifting under equipment vibration or other external forces, and also extending the service life of the device and reducing the damage risk of the device.

[0029] The limit flange 4 is arranged on the outer side of the shell 31 of the measuring probe 3 by welding. The welding position is based on restricting the length of the measuring probe 3 extending into the metal pipe 1. The distance from the welding position to the bottom of the insulating cap 32 is the same as the length of the through hole 21 of the mounting base 2, ensuring that the bottom of the insulating cap 32 is flush with the inner wall of the metal pipe 1. Through the limit flange 4, during the operation process, when the internal environment of the metal pipe 1 is not clear, the problem of unable to determine the depth is avoided, and the problem that the measuring probe 3 is damaged due to excessive penetration and being impacted by powder is prevented, as well as the situation that the monopole antenna cannot effectively collect electrostatic field information due to the measuring probe 3 extending too shallowly is prevented.

[0030] The measuring probe 3 is the core component of the whole device, including a shell 31, an insulating cap 32 and a detection device 33. The shell 31 is cylindrical, and its end is provided with a stepped reduced-diameter structure, which is beneficial to the stable installation of the insulating cap 32. The insulating cap 32 is fixed on the reduced-diameter structure by interference fit to ensure a tight connection between the two and prevent powder or other impurities from entering the inside of the detection device 33. The insulating cap 32 is arranged at one end of the shell 31 connected to the metal pipe 1, and its outer surface is an arc-shaped convex structure. The design of the insulating cap 32 protects the broadband heterogeneous monopole antenna 331 and the signal processing circuit 332 inside the detection device 33 from being eroded by powder on the one hand, and extends the service life of the detection device 33; on the other hand, its arc-shaped convex structure can reduce the resistance to the powder flow and avoid affecting the normal flow of the powder in the pipe due to the presence of the measuring probe 3. The bottom of the insulating cap 32 is flush with the inner wall of the pipe. Such a setting can make the measuring probe 3 more accurately sense the static voltage of the powder in the pipe and be less affected by electromagnetic interference. The detection device 33 is installed inside the shell 31 and includes a broadband heterogeneous monopole antenna 331 and a signal processing circuit 332. The sensing end of the broadband heterogeneous monopole antenna 331 faces the inside of the metal pipe 1 and is responsible for capturing the static voltage signal generated by the powder. The signal processing circuit 332 processes the signal sensed by the antenna and converts it into an electrical signal convenient for subsequent analysis and measurement.

[0031] The pipeline-type powder static voltage testing method based on a monopole antenna is as follows

[0032] Environment construction stage: First, align the upper and lower flanges of the metal pipe 1 with the overall transportation pipeline, and use connecting parts such as bolts to tightly fix the flanges to ensure that the test device is firmly connected to the pipeline and well sealed to prevent powder leakage, and firmly ground the grounding wire on the metal pipe 1;

[0033] Measurement equipment selection: According to the powder transportation speed, select the mounting base 2 with a through hole 21 at an appropriate inclination angle;

[0034] Measurement device access: Weld the mounting base 2 on the outer side of the metal pipe 1, and align the through-hole 21 of the mounting base 2 with the mounting hole 11. Then, screw the measurement probe 3 into the inner side of the mounting base 2 through the cooperation of the external thread of the housing 31 and the internal thread of the mounting base 2 until the limiting flange 4 is in close contact with the mounting base 2. For the connection between the limiting flange 4 and the mounting base 2, a buckle can be installed or further connected by bolts to ensure the stability of the connection.

[0035] Measurement stage: When the device is installed and put into use, the powder starts to flow inside the metal pipe 1. As the powder flows, it generates static electricity. The broadband heterogeneous monopole antenna 331 senses the voltage signals generated by this static electricity and transmits them to the signal processing circuit 332. After a series of processing of the signals by the signal processing circuit 332, an electrical signal that can be measured and analyzed is output. The electrical signal can directly display the static voltage value of the powder through the connected display device, or it can be transmitted to the control system for real-time monitoring and adjustment of the production process. During the measurement process, due to the annular shielding layer of the metal pipe 1, the special design of the mounting base 2, and the fixing effect of the limiting flange 4, the measurement probe 3 can work stably, effectively reducing external interference and ensuring the accuracy of the measurement results.

[0036] During the actual use process, to ensure that the test device always maintains a good working state, regular maintenance and upkeep are required. Regularly check whether the flange connection of the metal pipe 1 is well-sealed and whether the annular shielding layer is damaged to ensure the normal transportation of the powder and the electromagnetic shielding effect. Check whether the welded part of the mounting base 2 and the metal pipe 1 is loose or cracked, and whether the fastening bolts are tightened. For the measurement probe 3, check whether the insulating cap 32 is worn or damaged, and replace it in time if necessary to protect the detection device 33. At the same time, regularly calibrate and debug the signal processing circuit 332 to ensure that its signal processing is accurate and error-free, thereby ensuring the measurement accuracy of the entire test device.

[0037] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pipeline powder electrostatic voltage testing device based on a monopole antenna, characterized in that It includes a metal pipeline (1), an installation base (2), a limit flange (4) and a measurement probe (3); the installation base (2) is arranged on the outer wall of the metal pipeline (1); the measurement probe (3) is connected to the metal pipeline (1) through the installation base (2); the limit flange (4) is arranged outside the installation base (2).

2. The pipeline powder electrostatic voltage testing device based on a monopole antenna according to claim 1, characterized in that, The metal pipeline (1) is cylindrical, with two flanges arranged at the upper and lower parts respectively, and an installation hole (11) is arranged on one side of the pipeline; an annular shielding layer is arranged inside the flange; the annular shielding layer is grounded through a ground wire.

3. The pipeline type powder electrostatic voltage testing device based on a monopole antenna according to claim 1, characterized in that, The installation base (2) is installed on the outside of the metal pipeline (1) by welding. A through hole (21) is provided at the center of the installation base (2) and is communicated with the installation hole (11) on the metal pipeline (1); the inner diameter of the through hole (21) is slightly larger than that of the installation hole (11); the axis of the through hole (21) on the installation base (2) is not perpendicular to the powder flow direction inside the pipeline; the inclination angle is set to 0°-30° according to the powder flow rate.

4. The pipeline powder electrostatic voltage testing device based on a monopole antenna according to claim 1, characterized in that The measurement probe (3) includes a housing (31), an insulating cap (32) and a detection device (33); the housing (31) is cylindrical and is grounded through a ground wire; the insulating cap (32) is arranged at one end of the housing (31) connected to the metal pipeline (1); the detection device (33) is installed inside the housing (31) and includes a broadband non-standard monopole antenna (331) and a signal processing circuit (332); external threads are arranged on the outside of the housing (31); the outer surface of the insulating cap (32) is an arc spherical surface structure, and the bottom of the insulating cap (32) is flush with the inner wall of the pipeline; the induction end of the broadband non-standard monopole antenna (331) faces the inside of the metal pipeline (1); the measurement probe (3) is along the axis of the through hole (21) on the installation base (2).

5. The pipeline type powder electrostatic voltage testing device based on a monopole antenna according to claim 1, characterized in that, A stepped reduced diameter structure is provided at the end of the housing (31), and the insulating cap (32) is fixed to the reduced diameter structure by interference fit.

6. The pipeline powder electrostatic voltage testing device based on a monopole antenna according to claim 1, characterized in that The inner diameter of the limit flange (4) is the same as that of the through hole (21) of the installation base (2), and it is connected to the housing (31) by welding; the distance from the installation position of the limit flange (4) to the bottom of the insulating cap (32) is the same as the length of the through hole (21) of the installation base (2).

7. A pipeline type powder electrostatic voltage testing method based on a monopole antenna, which is completed by means of the device according to any one of claims 1-6, and includes the following steps: Environmental construction stage: Use bolts to connect the powder transportation pipeline through the two flanges on the upper and lower parts of the metal pipeline, check that the sealing is good, and firmly ground the ground wire on the metal pipeline (1). Measurement equipment selection: According to the powder transportation speed, select an installation base (2) with a through hole at a suitable angle. Measurement equipment access: Weld the installation base (2) on the side of the metal pipeline (1), align the through hole (21) of the installation base (2) with the installation hole (11), and then screw the measurement probe (3) into the inner thread of the installation base (2) through the external thread of the housing (31) until the limit flange (4) is in close contact with the installation base (2). Measurement stage: When the powder starts to be transported, the broadband non-standard monopole antenna (331) at the front end of the measurement probe (3) senses the change in the electrostatic field inside the pipeline and converts this change into an electrical signal. The electrical signal is transmitted to the signal processing circuit (332), and after preprocessing by the signal processing circuit (332), it is sent to the computer, and the electrostatic voltage is obtained after being processed by a preset algorithm.

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