Pipeline type powder electrostatic voltage test sensor based on monopole antenna

Abstract

The utility model discloses a pipeline type powder electrostatic voltage test sensor 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 connecting equipment and 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 can adjust the depth of the measuring probe and prevent displacement of the measuring probe; the measuring probe comprises a shell, an insulation cap and a detection device, the insulation cap protects the detection device and reduces powder flow resistance, a broadband special-shaped monopole antenna in the detection device is responsible for capturing electrostatic signals, and a signal processing circuit carries out signal processing. The sensor is convenient to install, high in measurement precision, high in stability and capable of effectively measuring electrostatic voltage of powder in a pipeline, guaranteeing production safety and improving product quality.

Description

Technical Field

[0001] This utility model relates to the field of powder electrostatic measurement technology, and in particular to a pipeline-type powder electrostatic voltage test sensor based on a monopole antenna. Background Technology

[0002] In industries such as chemical, food, and pharmaceutical, static electricity in powder can lead to problems such as dust explosions and decreased product quality. Therefore, accurately measuring the amount of static charge generated by powder during pipeline transportation is crucial for ensuring production safety and improving product quality. Currently, various static electricity measurement devices exist on the market, but sensors for measuring static electricity in powder within pipelines still have many shortcomings in terms of measurement accuracy, stability, and ease of installation. For example, some traditional static electricity measurement sensors have complex structures, are difficult to install, and are easily affected by external interference, leading to inaccurate measurement results.

[0003] During the transportation of powder materials, static electricity is easily generated due to friction and collision between the powder and the inner wall of the pipeline. The accumulation of static electricity can lead to hazards such as electrostatic discharge, posing a serious threat to production safety. Especially in special material transportation systems in the military industry, the friction and collision between powder and the inner wall of the pipeline during the transportation of flammable and explosive chemicals (such as ammunition raw materials and solid propellants) and toxic and harmful chemicals (such as nuclear waste intermediates and highly toxic reagents) accumulate large amounts of static electricity. If these static charges are not monitored and controlled in time, they can lead to catastrophic consequences: on ammunition production lines, electrostatic discharge can ignite gunpowder; in rocket propellant pipelines, static electricity accumulation can lead to fuel deflagration; in nuclear chemical pipelines, sparks caused by static electricity can damage the sealing structure, leading to the leakage of radioactive materials. According to military accident statistics, a flash explosion caused by static electricity during the fuel loading process of a certain type of missile resulted in equipment damage and casualties worth hundreds of millions of yuan. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a more accurate, stable and easy-to-install pipeline-type powder electrostatic voltage test sensor.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A pipeline-type powder electrostatic voltage test sensor based on a monopole antenna, the key technology of which includes a metal pipeline, a mounting base, a limiting flange, and a measuring probe; the mounting base is disposed on the outer wall of the metal pipeline; the measuring probe is connected to the metal pipeline through the mounting base; and the limiting flange is disposed on the outside of the mounting base.

[0007] Preferably, the metal pipe is cylindrical, with two flanges at the top and bottom respectively, and a mounting hole on one side of the pipe; an annular shielding layer is provided inside the flange; the annular shielding layer is grounded through a grounding wire.

[0008] Preferably, the mounting base is installed on the outside of the metal pipe by welding, and the center of the mounting base has a through hole that communicates with the mounting hole on the metal pipe; the inner diameter of the through hole is slightly larger than that of the mounting hole; the axis of the through hole on the mounting base is not perpendicular to the flow direction of the powder in the pipe; the tilt angle is set to 0°-30° according to the powder flow rate.

[0009] Preferably, the measuring probe includes a housing, an insulating cap, and a detection device; the housing is cylindrical and grounded via a grounding wire; the insulating cap is disposed at one end of the housing connected to the metal pipe; the detection device is installed inside the housing and includes a broadband irregular-shaped monopole antenna and a signal processing circuit; the outer side of the housing is provided with external threads; the outer surface of the insulating cap has an arc-shaped spherical structure, and the bottom of the insulating cap is flush with the inner wall of the pipe; the sensing end of the broadband irregular-shaped monopole antenna faces the inside of the metal pipe; the measuring probe is along the axis of the through hole on the mounting base.

[0010] Preferably, the end of the outer shell is provided with a stepped diameter reduction structure, and the insulating cap is fixed to the diameter reduction structure by interference fit.

[0011] Preferably, the inner diameter of the limiting flange is consistent with the through hole of the mounting base, and it is connected to the outer shell by welding; the distance from the installation position of the limiting flange to the bottom of the insulating cap is consistent with the length of the through hole of the mounting base.

[0012] The beneficial effects of adopting the above technical solution are as follows:

[0013] In this invention, the measuring probe is inserted into the metal pipe at an inclined angle, which reduces the impact of powder flow on the measuring probe, ensures the stability of the device, and optimizes the capture efficiency of the electric field in the tangential direction, making the collection of electrostatic voltage information in the powder more accurate.

[0014] In this invention, a metal pipe is connected to the powder transportation environment via a flange. The measuring probe is inserted into the testing environment and can be limited by a limiting flange and reinforced with fastening bolts, making the installation process convenient. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of a pipe-type powder electrostatic voltage test sensor based on a monopole antenna proposed in this utility model;

[0017] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0018] Explanation of reference numerals in the attached figures

[0019] 1. Metal pipe; 11. Mounting hole; 2. Mounting base; 21. Through hole; 3. Measuring probe; 31. Housing; 32. Insulating cap; 33. Detection device; 331. Broadband irregular monopole antenna; 332. Signal processing circuit; 4. Limiting flange. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] like Figure 1-2 This invention proposes a pipe-type powder electrostatic voltage testing sensor based on a monopole antenna, comprising a metal pipe 1, a mounting base 2, a limiting flange 4, and a measuring probe 3.

[0022] The metal pipe 1 is cylindrical with two flanges at the top and bottom for connecting to other pipes or equipment, providing an environment for electrostatic voltage testing of powder, and preventing powder leakage. A mounting hole 11 is provided on one side of the pipe, providing a channel for installing the measuring probe 3. An annular shielding layer is installed inside the two flanges to resist external electromagnetic interference. In practical use, especially in industrial production environments, there are numerous sources of electromagnetic interference in the surrounding environment, such as electromagnetic radiation from large motors and transformers. These interference signals entering the measurement system can cause deviations in the measurement results. The annular shielding layer, through its own conductivity, can guide external electromagnetic interference to the ground via a grounding wire, thus ensuring that the signal sensed by the measuring probe 3 mainly originates from the powder inside the pipe, greatly improving the accuracy and reliability of the measurement.

[0023] The mounting base 2 is securely installed on the outside of the metal pipe 1 by welding. This connection method ensures a tight fit between the mounting base 2 and the metal pipe 1, preventing loosening. The mounting base 2 has a through hole 21 at its center, which communicates with the mounting hole 11 on the metal pipe 1. The inner diameter of the through hole 21 is slightly larger than that of the mounting hole 11, allowing the measuring probe 3 to pass smoothly through and penetrate deep into the pipe for measurement. The axis of the through hole 21 on the mounting base 2 is not perpendicular to the direction of powder flow inside the pipe. The inclined welding surface and the non-perpendicular axis of the through hole 21 effectively reduce the impact force of the powder flow on the measuring probe 3. When powder flows at high speed in the pipeline, if the measuring probe 3 faces the powder flow direction directly perpendicularly, it will be subjected to a large impact force. This may not only affect the measurement accuracy of the measuring probe 3, but may also damage the measuring probe 3 and reduce its service life. The tilt angle is selected from 0° to 30° according to the powder flow velocity in the actual test environment. For powders with higher flow velocities, the tilt angle is larger. At the same time, the tilted measuring probe 3 forms an angle between the sensing direction of the monopole antenna and the direction of the electrostatic field generated by the powder flow, thereby optimizing the capture efficiency of the tangential component of the electric field. The inner side of the through hole 21 of the mounting base 2 is provided with fastening threads. After the measuring probe 3 is installed, the tight fit between the threads further fixes the relative position of the measuring probe 3 and the base, enhances the stability of the overall structure, prevents displacement under equipment vibration or other external forces, and can also extend the service life of the device and reduce the risk of damage to the device.

[0024] The limiting flange 4 is welded to the outside of the housing 31 of the measuring probe 3. The welding position is designed to limit 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 consistent with 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. The limiting flange 4 avoids the problem of uncertain depth during operation when the internal environment of the metal pipe 1 is unknown. It also prevents the measuring probe 3 from being damaged by powder impact due to excessive insertion and prevents the monopole antenna from effectively collecting electrostatic field information due to insufficient insertion distance of the measuring probe 3.

[0025] The measuring probe 3 is the core component of the entire device, comprising a housing 31, an insulating cap 32, and a detection device 33. The housing 31 is cylindrical with a stepped, tapered end. This structure facilitates the stable installation of the insulating cap 32, which is fixed to the tapered structure via an interference fit, ensuring a tight connection and preventing powder or other impurities from entering the detection device 33. The insulating cap 32 is located at the end of the housing 31 that connects to the metal pipe 1. Its outer surface has an arc-shaped protrusion. The design of the insulating cap 32 protects the broadband irregular monopole antenna 331 and signal processing circuit 332 inside the detection device 33 from powder corrosion, extending the device's lifespan. Furthermore, its arc-shaped protrusion reduces resistance to powder flow, preventing the measuring probe 3 from affecting the normal flow of powder within the pipe. The bottom of the insulating cap 32 is flush with the inner wall of the pipe. This design allows the measuring probe 3 to more accurately sense the electrostatic voltage of the powder within the pipe while experiencing less electromagnetic interference. The detection device 33 is installed inside the housing 31 and includes a broadband irregular-shaped monopole antenna 331 and a signal processing circuit 332. The sensing end of the broadband irregular-shaped monopole antenna 331 faces the inside of the metal pipe 1 and is responsible for capturing the electrostatic 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 that is convenient for subsequent analysis and measurement.

[0026] In practical use, the following steps are included:

[0027] (I) Installation process When installing the test sensor, first align the upper and lower flanges of the pipeline sensor with the overall transport pipeline, and use bolts and other connectors to firmly fix the flanges to ensure that the sensor is firmly connected to the pipeline and has a good seal to prevent powder leakage.

[0028] The metal pipe 1 should be inspected to ensure that its mounting hole 11 is accurately positioned and undamaged. A mounting base 2 with a suitable inclined through-hole 21 should be welded to the outside of the metal pipe 1. After welding, the measuring probe 3 is screwed into the metal pipe 1 by rotating it through the engagement of the external thread on the outer shell 31 with the internal thread of the through-hole 21 until the limiting flange 4 is tightly fitted to the mounting base 2. For the connection between the limiting flange 4 and the mounting base 2, a clip can be installed or bolts can be used for further connection to ensure a stable connection.

[0029] (II) Measurement Process After the device is installed and put into use, the powder begins to flow within the metal pipe 1. As the powder flows, it generates static electricity. The broadband irregular-shaped monopole antenna 331 senses the voltage signals generated by this static electricity and transmits them to the signal processing circuit 332. The signal processing circuit 332 processes the signal and outputs an electrical signal that can be measured and analyzed. The electrical signal can be directly displayed on a connected display device to show the static voltage value of the powder, 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 measuring probe 3 can work stably, effectively reducing external interference and ensuring the accuracy of the measurement results.

[0030] (III) Maintenance and Care In actual use, to ensure the test sensor maintains good working condition, regular maintenance and care are required. Regularly check whether the flange connection of the metal pipe 1 is properly sealed and whether the annular shielding layer is damaged to ensure normal powder transport and electromagnetic shielding effectiveness. Check whether the welded joint between the mounting base 2 and the metal pipe 1 is loose or cracked, and whether the fastening bolts are tightened. For the measuring probe 3, check whether the insulating cap 32 is worn or damaged; if so, replace it promptly to protect the detection device 33. Simultaneously, regularly calibrate and debug the signal processing circuit 332 to ensure accurate signal processing, thereby guaranteeing the measurement accuracy of the entire test sensor.

[0031] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A monopole antenna based pipe type powder electrostatic voltage test sensor, characterized in that, It includes a metal pipe (1), a mounting base (2), a limiting flange (4), and a measuring probe (3); the mounting base (2) is disposed on the outer wall of the metal pipe (1); the measuring probe (3) is connected to the metal pipe (1) through the mounting base (2); the limiting flange (4) is disposed on the outside of the mounting base (2).

2. The monopole antenna based pipe type powder electrostatic voltage test sensor according to claim 1, wherein, The metal pipe (1) is cylindrical, with two flanges at the top and bottom respectively, and an installation hole (11) on one side of the pipe; an annular shielding layer is provided on the inner side of the flange; the annular shielding layer is grounded through a grounding wire.

3. The monopole antenna based pipe type powder electrostatic voltage test sensor according to claim 1, wherein, The mounting base (2) is installed on the outside of the metal pipe (1) by welding. The mounting base (2) has a through hole (21) in the center that communicates with the mounting hole (11) on the metal pipe (1). The inner diameter of the through hole (21) is slightly larger than that of the mounting hole (11). The axis of the through hole (21) on the mounting base (2) is not perpendicular to the flow direction of the powder in the pipe. The inclination angle of the axis of the through hole (21) is set to 0°-30° according to the powder flow rate.

4. The monopole antenna based pipe type powder electrostatic voltage test sensor according to claim 1, wherein, The measuring probe (3) includes a housing (31), an insulating cap (32), and a detection device (33); the housing (31) is cylindrical and grounded through a grounding wire; the insulating cap (32) is located at one end of the housing (31) that is connected to the metal pipe (1); the detection device (33) is installed inside the housing (31) and includes a broadband irregular monopole antenna (331) and a signal processing circuit (332); the outer side of the housing (31) is provided with an external thread; the outer surface of the insulating cap (32) is an arc-shaped spherical structure, and the bottom of the insulating cap (32) is flush with the inner wall of the pipe; the sensing end of the broadband irregular monopole antenna (331) faces the inside of the metal pipe (1); the measuring probe (3) is along the axis of the through hole (21) on the mounting base (2).

5. The monopole antenna based pipe type powder electrostatic voltage test sensor according to claim 4, wherein, The end of the outer shell (31) is provided with a stepped diameter reduction structure, and the insulating cap (32) is fixed to the diameter reduction structure by interference fit.

6. The monopole antenna based pipe type powder electrostatic voltage test sensor according to claim 5, wherein, The inner diameter of the limiting flange (4) is consistent with the through hole (21) of the mounting base (2) and is connected to the outer shell (31) by welding; the distance from the installation position of the limiting flange (4) to the bottom of the insulating cap (32) is consistent with the length of the through hole (21) of the mounting base (2).

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