High-insulating-performance pipeline type powder electrostatic charge testing device and high-insulating-performance pipeline type powder electrostatic charge testing method

Abstract

The invention discloses a high-insulation performance pipeline type powder electrostatic charge testing device and method, and relates to the technical field of electrostatic charge measurement. Comprising a metal pipeline, a mounting base and a BNC adapter. The metal pipeline comprises a metal inner pipe and a metal outer pipe, and a polytetrafluoroethylene high-voltage insulating material is arranged between the metal inner pipe and the metal outer pipe to ensure insulation. And the metal outer tube is grounded and is provided with a mounting hole for mounting the BNC adapter. And the mounting base is welded on the outer pipe and is provided with a glue injection hole and a through hole. And a high-voltage-resistant core wire of the BNC adapter is connected with the metal inner tube through threads and is isolated from the mounting base, the metal outer tube and the shell through insulating glue and a protective shell. According to the method, the BNC adapter is used for measuring the potential difference of the metal inner pipe and the metal outer pipe, a high-insulating-performance testing environment is built in a combined mode, the method has the advantages of being good in insulating performance, accurate in measurement and convenient to install and maintain, is suitable for various powder conveying pipelines, and can effectively meet the measurement requirement for powder electrostatic charges in industrial production.

Description

Technical Field

[0001] The present invention relates to the technical field of electrostatic charge measurement, and particularly to a pipeline-type powder electrostatic charge testing device and method with high insulation performance. Background Art

[0002] In the industrial production process, the transportation of powder materials is a common and important link. When powder is transported in a pipeline, due to physical effects such as friction and collision, electrostatic charges are easily generated. These electrostatic charges may not only interfere with the production process, but also trigger safety accidents such as fires and explosions, posing a serious threat to the safety of personnel and equipment. Therefore, it is of great significance to monitor and control the electrostatic charges generated during the powder transportation process in real time.

[0003] At present, there are various electrostatic charge measurement devices on the market, but these devices still have some deficiencies in actual applications. The insulation performance of many electrostatic charge measurement devices is insufficient, resulting in inaccurate measurement results. During the powder transportation process, the generation and accumulation of electrostatic charges is a dynamic process. If the insulation performance of the measurement device is poor, the charges are likely to leak, leading to distorted measurement results. Some existing pipeline charge measurement devices adopt a bypass timed powder collection mechanism to measure the powder charge periodically and cannot give the real-time dynamic charging situation; the existing electrostatic charge measurement devices have complex structures, inconvenient installation and maintenance, increasing the use cost. In addition, the measurement accuracy of some measurement devices is relatively low, unable to meet the requirements of high-precision measurement, restricting their application scope in industrial production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a pipeline-type powder electrostatic charge testing device and method with better insulation, more accurate measurement and more convenient use.

[0005] To solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] A pipeline-type powder electrostatic charge testing device with high insulation performance, the key technology of which lies in including a metal pipeline, an installation base and a BNC adapter; the installation base is connected to the outside of the metal pipeline, the outer shell of the BNC adapter is connected to the installation base, and the high-voltage-resistant core wire of the BNC adapter is connected to the metal pipeline.

[0007] Preferably, the metal pipeline includes a metal outer pipe, a metal inner pipe and two flange plates up and down, and a tetrafluoroethylene high-voltage insulation liner is installed between the metal inner pipe and the metal outer pipe;

[0008] The metal inner tube is provided with connecting screw holes; both ends of the inner tube are provided with tetrafluoro high-voltage insulating end tubes; one side of the outer tube is provided with a mounting hole; the mounting hole penetrates through the metal outer tube and the tetrafluoro high-voltage insulating liner tube; the axis of the mounting hole coincides with the axis of the connecting screw hole; the metal outer tube is externally connected with a grounding wire and is firmly grounded.

[0009] Preferably, the mounting base is installed on the outer side of the metal outer tube by welding; a glue injection hole is provided on the side surface of the mounting base; a through hole is provided on the mounting base, the diameter of the through hole is the same as that of the mounting hole, and the axis of the through hole coincides with the axis of the mounting hole; the glue injection hole penetrates through one side of the mounting base and is connected to the through hole.

[0010] Preferably, the BNC adapter includes a housing, a protective shell, and a high-voltage-resistant core wire;

[0011] The housing includes a fixed flange and a metal cylinder; the metal cylinder is connected to one side of the flange; the other side of the flange is connected to the mounting base; the inner diameter of the fixed flange is the same as the outer diameter of the protective shell, and the inner diameter of the metal cylinder is slightly larger than the outer diameter of the protective shell;

[0012] One end of the high-voltage-resistant core wire is provided with a thread; the outer side of the part of the core wire not covered by the protective shell is provided as an insulating glue chamber; the glue injection hole is communicated with the insulating glue chamber; the threaded end of the high-voltage-resistant core wire passes through the mounting hole, the through hole, and the fixed flange, and is connected to the connecting screw hole of the metal inner tube through thread fit; one end of the high-voltage-resistant core wire is flush with the inner wall of the metal inner tube;

[0013] The insulating glue chamber includes a cylindrical space inside the mounting hole and the through hole;

[0014] The protective shell covers the end of the high-voltage-resistant core wire without a thread and passes through the limiting flange and the through hole; the outer diameter of the protective shell is slightly smaller than the diameter of the through hole of the mounting base, and a measuring hole for connecting a test line is provided at the top of the protective shell.

[0015] A method for testing the electrostatic charge of pipeline-type powder with high insulation performance, the method is completed by means of the above device, and the key technology lies in the following steps:

[0016] Environment construction: First, use bolts to connect the powder transportation pipeline through the upper and lower flanges of the metal pipeline, check that the sealing is good, and firmly ground the grounding wire on the metal outer tube;

[0017] Measurement equipment installation: Weld the mounting base on the side of the metal outer tube, and align the through hole of the mounting base with the mounting hole. Then connect the BNC adapter to the mounting base through the fixed flange on the housing; further connect the threaded end of the high-voltage-resistant core wire through the fixed flange to the connecting screw hole of the metal inner tube, and finally sleeve the protective shell on the other end of the high-voltage-resistant core wire;

[0018] Glue injection stage: Inject insulating glue into the insulating glue chamber through the glue injection hole of the installation base, and wait for the insulating glue to cure;

[0019] Measurement stage: The powder starts to be transported. Connect the high-voltage-resistant core wire through the measurement hole on the protective shell to obtain the potential difference between the inner metal tube and the outer metal tube. At the same time, read the preset capacitance value, and calculate the static charge quantity generated inside the pipeline by calculating the measured potential difference and capacitance value.

[0020] The beneficial effects produced by adopting the above technical solutions are as follows:

[0021] In the present invention, an insulating barrier is formed between the inner metal tube and the outer metal tube through the tetrafluoroethylene high-voltage insulating liner and the tetrafluoroethylene high-voltage insulating end tube, ensuring the insulating state between the inner and outer metal tubes. At the same time, a grounding wire is added to the outer metal tube, further reducing the influence of the outer metal tube on the inner metal tube; at the same time, for the high-voltage-resistant core wire of the measurement core, an insulating glue and a protective shell are used for isolation, preventing charges from leaking to the outer metal tube through the core wire.

[0022] In the present invention, the static charge quantity is measured by measuring the potential difference between the inner metal tube and the outer metal tube. This measurement method based on the principle of electrostatic induction, combined with the high-insulation environment created in the present invention, as well as the stable electrical connection structure between the high-voltage-resistant core wire and the inner metal tube, improves the measurement accuracy.

[0023] In the present invention, the powder transportation pipeline is connected through a flange, and the high-voltage-resistant core wire is connected through a threaded screw hole fit. The installation process and the difficulty of later update and maintenance are low, the installation is simple, and the work efficiency is improved. Description of the Drawings

[0024] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0025] Figure 1 It is a schematic structural diagram of a pipeline-type powder static charge test device with high insulation performance proposed by the present invention;

[0026] Description of the Reference Numerals in the Drawings

[0027] 1. Metal pipeline; 11. Outer metal tube; 111. Installation hole; 12. Inner metal tube; 121. Connection screw hole; 13. Tetrafluoroethylene high-voltage insulating liner; 14. Tetrafluoroethylene high-voltage insulating end tube; 2. Installation base; 21. Glue injection hole; 3. BNC adapter; 31. Outer shell; 311. Fixed flange; 312. Metal cylinder; 32. High-voltage-resistant core wire; 33. Protective shell; 331: Measurement hole; 4. Insulating glue chamber. Specific Embodiments

[0028] To make the above objects, features, and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific implementation manners 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 belong to the scope of protection of the present invention.

[0029] See the attached Figure 1 , a pipeline-type powder electrostatic charge testing device with high insulation performance, including a metal pipeline 1, an installation base 2, and a BNC adapter 3;

[0030] Among them, the metal pipeline 1 is composed of a metal inner pipe 12 and a metal outer pipe 11. A polytetrafluoroethylene high-voltage insulating material is installed between the metal inner pipe 12 and the metal outer pipe 11, specifically including tetrafluoro high-voltage insulating end pipes 14 at both ends of the metal inner pipe 12 and a tetrafluoro high-voltage insulating liner pipe 13 disposed between the metal inner pipe 12 and the metal outer pipe 11. Polytetrafluoroethylene has excellent insulation performance and high-voltage resistance characteristics. The use of the tetrafluoro high-voltage insulating liner pipe 13 and the tetrafluoro high-voltage insulating end pipes 14 forms a reliable insulation barrier between the metal inner pipe 12 and the metal outer pipe 11. This structural design can effectively prevent charge leakage between the inner and outer metal pipes, ensuring that the device can accurately capture the electrostatic charge generated by the powder in the pipeline during the measurement process, greatly improving the measurement accuracy, and providing strong support for electrostatic monitoring and control in industrial production. Flange plates are respectively provided at the upper and lower ends of the pipeline. Through these two flange plates, the testing device can be connected to the overall transportation pipeline to achieve seamless integration of the powder transmission channel. The connection method of the flange plates is simple and reliable, without the need for complex installation tools and techniques. Operators can quickly complete the installation and disassembly of the testing device. This not only improves the installation efficiency, reduces the installation cost, but also facilitates the replacement and maintenance of the testing device when needed, improving the flexibility and reliability of the production process. Moreover, the standard interface design of the flange plates enables the device to be adapted to various transportation pipelines of different specifications and types. Whether it is a vertical pipeline or a horizontal pipeline, it can be easily installed and used. This greatly expands the application range of the testing device and meets the needs of different industrial production scenarios.

[0031] An installation hole 111 is provided on one side of the metal outer tube 11. The installation hole 111 penetrates through the metal outer tube 11 and the PTFE high-voltage insulation liner 13, providing an installation environment for the BNC adapter 3. At the same time, the remaining part constitutes a part of the insulating glue chamber 4. Meanwhile, the metal outer tube 11 is externally connected to a grounding wire. Through the stable grounding of the grounding wire, it is ensured that the metal outer tube 11 is always at zero electric potential, reducing the interference of the charges on the metal outer tube 11 to the metal inner tube 12, facilitating the subsequent measurement of the potential difference between the metal inner tube 12 and the metal outer tube 11, and also improving the accuracy of charge measurement.

[0032] A connecting screw hole 121 is provided on the metal inner tube 12. The axis of the installation hole 111 coincides with the axis of the connecting screw hole 121, which is used to connect the high-voltage-resistant core wire 32 of the BNC adapter 3.

[0033] The installation base 2 is fixed to the outside of the metal outer tube 11 by welding. The stable installation base 2 can better protect internal components such as the high-voltage-resistant core wire 32, preventing them from being interfered with and damaged by external factors, and providing a stable structural support for the entire BNC adapter. During the use of the test device, even if affected by vibrations and temperature changes in the external environment, the BNC adapter will not become loose or displaced, ensuring the stability and reliability of the electrostatic detection structure. A through hole is provided in the installation base 2, and the diameter of the through hole is the same as that of the installation hole 111, providing a test environment for the BNC adapter 3. At the same time, the internal space constitutes a part of the insulating glue chamber 4. A glue injection hole 21 is provided on one side of the installation base 2, which penetrates through one side of the installation base 2 and is connected to the through hole. The glue injection hole 21 is communicated with the insulating glue chamber 4 and is used to fill the insulating glue into the insulating glue chamber 4 after the installation of the test device is completed.

[0034] The BNC adapter 3 is the measurement core of this test device, including a housing 31, a protective shell 33, and a high-voltage-resistant core wire 32. The housing 31 includes a fixed flange 311 and a metal cylinder 312. The metal cylinder 312 is connected to one side of the fixed flange 311, and the other side of the fixed flange 311 is installed on the metal base, forming a protection and fixation structure for the inside of the BNC adapter 3. The fixed flange 311 and the metal base are connected by bolts or buckles, which is simple and convenient to operate. The metal cylinder 312 plays a role in protecting the internal measurement device and shielding interference to a certain extent. Since the inner diameter of the metal cylinder 312 is larger than the outer diameter of the protective shell 33, when the metal cylinder 312 is subjected to external forces, it will not be directly transmitted to the internal measurement device, and can achieve effective buffering to protect the integrity of the internal components. At the same time, the metal material has a certain shielding effect, which can reduce the influence of external electromagnetic interference on the electrostatic detection signal and improve the accuracy and stability of measurement.

[0035] The protective shell 33 covers the non-threaded end of the high-voltage-resistant core wire 32, preventing the direct contact between the high-voltage-resistant core wire 32 and the mounting base 2 and the outer shell 31 from causing grounding, and at the same time playing a role in stabilizing the high-voltage-resistant core wire 32. First, since the outer shell 31, the mounting base 2, and the metal outer tube 11 are all conductors and are interconnected, and the metal outer tube 11 is in a grounded state, in order to measure the electric potential of the metal inner tube 12, it is necessary to ensure that the metal inner tube 12 does not contact the outer shell 31 and the mounting base 2. At the same time, during the installation and use of the testing device, it may encounter collisions, frictions, etc. The protective shell 33 can act as a buffer layer to prevent sharp objects from scratching the core wire and avoid damage to the insulating layer of the core wire, thereby ensuring the stable electrical performance of the core wire and maintaining the normal operation of the testing device. Moreover, the outer diameter of the protective shell 33 is the same as the inner diameter of the fixed flange 311, which can ensure the stable relative position of the internal high-voltage-resistant core wire 32.

[0036] A measuring hole 331 for connecting the test circuit is provided at the top of the protective shell 33, and an external circuit is connected through the measuring hole 331 to obtain the potential difference between the metal inner tube 12 and the metal outer tube 11.

[0037] One end of the high-voltage-resistant core wire 32 is provided with a thread, and the high-voltage-resistant core wire 32 passes through the metal outer tube 11 and the PTFE high-voltage insulating liner 13, and is connected through the cooperation of the thread and the connecting screw hole 121 on the metal inner tube 12. The connection method of the thread and the screw hole ensures the firmness of the connection, the reliability of the point connection, the accuracy of the measurement during the measurement process, and at the same time is simple and convenient to install, and also facilitates the later update and maintenance. One end of the high-voltage-resistant core wire 32 is flush with the inner wall of the metal inner tube 12.

[0038] The insulating glue chamber 4 is a space formed by the mounting hole 111 and the through hole, which is the remaining space after the protective shell 33 and the high-voltage-resistant core wire 32 are installed, and is used to carry a part of the insulating glue. This part is filled with insulating glue instead of hard insulating items, which ensures the insulating performance of the high-voltage-resistant core wire 32, prevents charge leakage through the gap between the core wire and the metal outer tube 11, and ensures the accuracy of the measurement result. At the same time, it has good sealing performance, can prevent external dust, moisture, etc. from entering the insulating glue chamber 4, and plays a protective role for the high-voltage-resistant core wire 32 and other components. Moreover, the filling of the insulating glue also enhances the mechanical strength of the entire electrostatic detection structure and improves the stability and reliability of the testing device.

[0039] A method for testing the electrostatic charge of pipeline-type powder with high insulation performance is as follows:

[0040] Environment construction: First, connect the upper and lower flanges of the metal pipeline 1 to the corresponding interfaces of the overall transportation pipeline, and fasten them with bolts and other connecting parts to ensure a tight connection and prevent powder leakage. Then, firmly ground the grounding wire on the metal outer tube 11.

[0041] Installation of measuring device: At the position of the installation hole 111 preset in the metal outer tube 11, the installation base 2 is fixed on the metal outer tube 11 by welding. During the welding process, the welding quality should be ensured to ensure a firm connection between the installation base 2 and the metal outer tube 11. Then, the housing 31 of the BNC adapter 3 is installed on the installation base 2 and fixed in the correct direction and position. After that, the high-voltage-resistant core wire 32 is passed through the metal outer tube 11, the tetrafluoroethylene high-voltage insulation liner 13 and the tetrafluoroethylene high-voltage insulation end tube 14, and the threaded end of the core wire is thread-fitted with the connection screw hole 121 of the metal inner tube 12. Rotate the core wire until it is tightened to ensure a reliable connection between the core wire and the metal inner tube 12, and then a protective shell 33 is put on the high-voltage-resistant core wire 32.

[0042] Glue injection stage: Insulating glue is injected into the insulating glue chamber 4 through the glue injection hole 21 on the side of the installation base 2. After the insulating glue completely fills the insulating glue chamber 4, it is left standing for a period of time to allow the insulating glue to fully cure, realizing the insulation between the high-voltage-resistant core wire 32 and the metal outer tube 11.

[0043] Measurement stage: After the powder starts to be transported in the pipeline, the powder is transported from top to bottom in the pipeline. Due to the friction, collision, etc. between the powder and the inner wall of the pipeline and between the powder particles, static charges will be generated. According to the principle of electrostatic induction, a potential difference will be generated on the inner and outer metal tubes. At this time, a potential difference measuring instrument is connected to the measuring hole 331 of the BNC adapter 3 to measure the potential difference between the inner and outer metal tubes. At the same time, the previously measured capacitance value is read. The measured potential difference and capacitance value are used to calculate the static charge amount generated in the pipeline. During the measurement process, the measurement data can be recorded regularly or in real time according to actual needs to monitor and analyze the change of static charges during the powder transportation process.

[0044] Through the electrostatic charge test device and test method proposed by the present invention, the potential difference between the inner and outer metal tubes can be measured in real time, so as to obtain the static charge amount in real time and dynamically.

[0045] 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 will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pipeline type powder electrostatic charge testing device with high insulation performance, characterized in that, It includes a metal pipe (1), an installation base (2), and a BNC adapter (3); the installation base (2) is connected to the outside of the metal pipe (1), the outer shell (31) of the BNC adapter (3) is connected to the installation base (2), and the high-pressure-resistant core wire (32) of the BNC adapter (3) is connected to the metal pipe (1).

2. The high-insulation performance pipeline type powder electrostatic charge testing device according to claim 1, characterized in that, The metal pipe (1) includes a metal outer pipe (11), a metal inner pipe (12), and two upper and lower flange plates. A PTFE high-pressure insulating liner (13) is installed between the metal inner pipe (12) and the metal outer pipe (11); The metal inner pipe (12) is provided with connecting screw holes (121); PTFE high-pressure insulating end pipes (14) are provided at both ends of the inner pipe; an installation hole (111) is provided on one side of the outer pipe; the installation hole (111) penetrates through the metal outer pipe (11) and the PTFE high-pressure insulating liner (13); the axis of the installation hole (111) coincides with the axis of the connecting screw hole (121); the metal outer pipe (11) is externally connected to a ground wire and is firmly grounded.

3. The high-insulation performance pipeline type powder electrostatic charge testing device according to claim 1, characterized in that, The installation base (2) is installed on the outside of the metal outer pipe (11) by welding; a glue injection hole (21) is provided on the side of the installation base (2); a through hole is provided on the installation base (2), the diameter of the through hole is the same as that of the installation hole (111), and the axis of the through hole coincides with the axis of the installation hole (111); the glue injection hole (21) penetrates through one side of the installation base (2) and is connected to the through hole.

4. The high-insulation performance pipeline-type powder electrostatic charge testing device according to claim 1, characterized in that, The BNC adapter (3) includes an outer shell (31), a protective shell (33), and a high-pressure-resistant core wire (32); The outer shell (31) includes a fixed flange plate (311) and a metal cylinder (312); the metal cylinder (312) is connected to one side of the flange plate; the other side of the flange plate is connected to the installation base (2); the inner diameter of the fixed flange plate (311) is the same as the outer diameter of the protective shell (33), and the inner diameter of the metal cylinder (312) is slightly larger than the outer diameter of the protective shell (33); One end of the high-pressure-resistant core wire (32) is provided with a thread; the outer side of the part of the core wire not covered by the protective shell (33) is set as an insulating glue chamber (4); the glue injection hole (21) is communicated with the insulating glue chamber (4); the threaded end of the high-pressure-resistant core wire (32) passes through the installation hole (111), the through hole, and the fixed flange plate (311), and is connected to the connecting screw hole (121) of the metal inner pipe (12) by thread fit; one end of the high-pressure-resistant core wire (32) is flush with the inner wall of the metal inner pipe (12); The insulating glue chamber (4) includes a cylindrical space inside the installation hole (111) and the through hole; The protective shell (33) covers the end of the high-pressure-resistant core wire (32) without a thread and passes through the limit flange plate and the through hole; the outer diameter of the protective shell (33) is slightly smaller than the diameter of the through hole of the installation base (2), and a measurement hole (331) for connecting a test line is provided at the top of the protective shell (33).

5. A method for testing the electrostatic charge of pipeline powder with high insulation performance, which is completed by means of the device described in any one of claims 1-4, and is characterized in that, It includes the following steps: Environment construction: First, use bolts to connect the two upper and lower flange plates of the metal pipe (1) to the powder transportation pipe, check that the sealing is good, and firmly ground the ground wire on the metal outer pipe (11); Installation of measuring device: Weld the mounting base (2) on the side of the metal outer tube (11), align the through-hole of the mounting base (2) with the mounting hole (111), and then connect the BNC adapter (3) to the mounting base (2) through the fixed flange (311) on the housing (31); further pass the threaded end of the high-voltage-resistant core wire (32) through the fixed flange (311) and connect it to the connection screw hole (121) of the metal inner tube (12), and finally sleeve the protective shell (33) on the other end of the high-voltage-resistant core wire (32). Glue injection stage: Inject insulating glue into the insulating glue chamber (4) through the glue injection hole (21) of the mounting base (2), and wait for the insulating glue to cure. Measurement stage: The powder starts to be transported. Connect the high-voltage-resistant core wire (32) through the measurement hole (331) on the protective shell (33) to obtain the potential difference between the metal inner tube (12) and the metal outer tube (11). At the same time, read the preset capacitance value, and calculate the static charge generated in the pipeline by the measured potential difference and capacitance value.

Images