Electrostatic sensor clamping tool for speed measurement

Abstract

The invention relates to the field of electrostatic sensor speed measurement, in particular to an electrostatic sensor clamping tool for speed measurement. Comprising a back frame, a ridge plate, an L-shaped pressing plate, fasteners and supporting legs, the back frame is a whole tool stress part, and the back frame is arranged on a test bed body and fixedly connected with the test bed body through the fasteners; the supporting legs are vertically and fixedly connected with the frame fixed by the fasteners of the back frame, and the supporting legs are fixedly connected with the test bed body through the fasteners; the two ends of the ridge plate are fixedly connected with the two side frames of the back frame, and the ridge plate is of a connecting force-bearing structure of the L-shaped pressing plate and the back frame. The L-shaped pressing plate is of an L-shaped structure, butt joint of the electrostatic sensor and the test tool is achieved through the ridge plate, and a force bearing structure is fixed to the electrostatic sensor. The position of the sensor can be accurately positioned, it is ensured that the sensor is located at the optimal measuring position, and fine adjustment can be conveniently conducted; the continuity and the stability of a measurement signal are ensured; the adaptability of the electrostatic sensor is enhanced.

Description

Technical Field

[0001] This invention relates to the field of electrostatic sensor speed measurement, and more specifically to an electrostatic sensor clamping fixture for speed measurement. Background Technology

[0002] Gas-solid two-phase flow is ubiquitous in people's production and daily life. For example, in industrial production, pneumatic conveying processes are used to transport pulverized coal, cement, ore, salt, and flour. In daily life, atmospheric particles and sandstorms are typical examples of gas-solid two-phase flow. With the development of modern industry, the requirements for the detection and control of process parameters are becoming increasingly stringent. Accurate measurement of gas-solid two-phase flow parameters has significant practical implications for many production sectors, including energy, chemical, environmental, meteorological, and metallurgical industries.

[0003] The velocity, concentration, and mass flow rate of gas-solid two-phase flow are several important parameters describing fluid flow conditions. Among them, velocity is the most important parameter, as it is a crucial factor in determining concentration and mass flow rate.

[0004] Currently, various non-contact particle velocity measurement methods have been developed, such as cross-correlation, spatial filtering, Doppler, nuclear magnetic resonance, and tracer methods. Among them, the two-phase flow velocity measurement system based on correlation technology has advantages such as wide measurement range, strong adaptability, no flow obstruction, and non-contact measurement. Therefore, it has significant advantages over other measurement methods in industrial applications. Due to the complexity and randomness of gas-solid two-phase flow, measuring powder concentration parameters is not easy. Researchers have proposed various methods for measuring solid phase concentration parameters in gas-solid two-phase flow, such as the capacitance method, differential pressure method, thermal equilibrium method, and root mean square method, among which the root mean square method is the simplest to implement. Based on the solid phase velocity and concentration, the mass flow rate of the two-phase flow can be obtained from the mass flow rate calculation formula.

[0005] Over the past three decades, electrostatic sensor-based measurement technology has been proposed, developed, and applied to continuous monitoring and measurement in a range of industrial processes, mechanical systems, and clinical environments. This includes flow measurement of pneumatically transported solids, particle emission measurement, fluidized bed monitoring, online particle size measurement, burner flame monitoring, velocity and radial vibration measurement of mechanical systems, and processes such as power conveyors and mechanical wear. An electrostatic sensor is a sensor used to detect the electric field generated by charged objects or particles. Its basic structure includes a sensing electrode, a shielding layer, signal amplification and processing circuitry, grounding, and encapsulation. The sensing electrode is typically made of conductive material and can be in geometric shapes such as plates or cylinders. Its main function is to capture the electrostatic field generated when charged particles pass by, outputting a signal through the induced charge on the electrode. To avoid external interference and the influence of other electromagnetic fields, the sensor is generally equipped with a shielding layer made of conductive materials such as metal mesh or metal foil to ensure signal purity. Because the electrostatic induction signal is relatively weak, the sensor also needs to be equipped with an amplification circuit to output a sufficiently strong signal, while a filtering circuit is used to filter out interference, making the signal more stable and accurate. Furthermore, the signal processing unit further analyzes and outputs the signal for use in subsequent control systems or display devices. The grounding section stabilizes the electric field, preventing signal drift and interference, enabling the sensor to more accurately detect the induced signals of charged particles. Finally, the encapsulation structure, made of plastic or metal, protects the internal electrodes and circuitry. Its design incorporates protection, waterproofing, and dustproofing to ensure the sensor functions properly in various environments. When a charged particle or object passes near the sensor, the charge on the sensing electrodes redistributes, generating an induced current, which is amplified and processed before being output as a signal. The amplitude and frequency of this signal are related to the velocity, number, and charge of the charged particles. Electrostatic sensing technology is well-suited for two-phase flow velocity detection.

[0006] Current research on electrostatic sensor technology focuses primarily on the structural design of the sensors themselves, particularly for two-phase flow velocity measurement. There are no universally compatible electrostatic sensors; each is custom-designed based on specific field testing conditions. This results in inconsistent structural parameters across sensors, leading to limited research on tooling. Traditional methods for fixing electrostatic sensors involve simple pasting or binding. However, in electrostatic velocity sensing, these methods are susceptible to damage during testing. Vibration, impact, or the force of the two-phase fluid can cause the sensor to loosen, shift, or even detach, affecting the stability and accuracy of the measurement signal. Traditional installation methods also struggle to ensure accurate sensor placement, leading to signal deviations and impacting velocity measurement accuracy. Furthermore, harsh testing environments, such as high temperatures, low temperatures, humidity, and dust, can further compromise the accuracy of velocity measurements. Summary of the Invention

[0007] Based on the above-mentioned technical problems, this invention proposes an electrostatic sensor clamping fixture for speed measurement, which solves the shortcomings of traditional fixing methods for electrostatic sensors, as well as the problems of installation deviation and test environment adaptability that affect the stability and accuracy of measurement signals.

[0008] To address the aforementioned technical problems, one objective of this invention is to provide a clamping fixture for an electrostatic sensor used in speed measurement, comprising a back frame 11, a spine plate 12, an L-shaped pressure plate 13, fasteners 14, and support legs 15. The back frame 11 is the load-bearing component of the entire tooling. The back frame 11 is placed on the test bench body and is fixedly connected to the test bench body by fasteners 14. The support leg 15 is vertically fixed to the frame of the back frame 11 by fasteners, and the support leg 15 is fixedly connected to the test bench body by fasteners 14. The spine plate 12 is fixedly connected to the two side frames of the back frame at both ends, forming an L-shaped pressure plate and a load-bearing structure for connecting the back frame. The L-shaped pressure plate 13 has an "L"-shaped structure and uses a ridge plate to connect the electrostatic sensor with the test fixture, serving as a fixed load-bearing structure for the electrostatic sensor.

[0009] Furthermore, the spine plate 12 is a rectangular metal plate placed in the center of the back frame, with a narrow rectangular slit in the middle, the slit aligned with the center of the sensor top cover.

[0010] Furthermore, the L-shaped pressure plate has double bolt holes. By passing bolts through the ridge plate opening, the position and height of the L-shaped pressure plate can be adjusted. By tightening the bolts, the stability of the sensor during flame jetting of the test piece can be achieved.

[0011] Furthermore, the spine plate is joined to the back frame at both ends by welding to ensure load-bearing strength.

[0012] Furthermore, the fastener 14 is saddle-shaped and has bolt holes, and is fastened to the test bench body by bolt clamping.

[0013] Furthermore, the support leg 15 is welded perpendicularly to the back frame 11.

[0014] Furthermore, the bottom edge of the back frame is the same length as the test bench surface, which facilitates the quick fixation of the test fixture by fasteners.

[0015] The above-described one or more technical solutions of the present invention have at least one or more of the following technical effects: 1) This invention addresses the shortcomings of traditional fixing methods: Through the mechanical structure of the clamping fixture, the electrostatic sensor can be fixed in a designated position, ensuring the stability and reliability of the sensor even in complex environments such as high vibration and high-speed airflow, and ensuring the continuity and stability of the measurement signal.

[0016] 2) This invention addresses the impact of installation deviations: Traditional installation methods struggle to ensure accurate sensor placement, leading to measurement signal deviations and affecting speed measurement accuracy. Clamping fixtures accurately position the sensor, ensuring it's in the optimal measurement location and allowing for convenient fine-tuning.

[0017] 3) This invention solves the problem of adaptability to the test environment: the adaptability of the electrostatic sensor is enhanced by clamping fixtures. Attached Figure Description

[0018] Figure 1 : Overall assembly diagram of the test fixture; Figure 2 : Schematic diagram of the overall structure of the test fixture; Figure 3 Schematic diagram of the back frame of the test fixture; Figure 4 Schematic diagram of the test fixture spine plate; Figure 5 : Schematic diagram of the connection between the spine plate and the back frame of the test fixture; Figure 6 Schematic diagram of the L-shaped pressure plate of the test fixture; Figure 7 : Schematic diagram of the assembly of the L-shaped pressure plate of the test fixture; Figure 8 Schematic diagram of the test fixture's support legs; Figure 9 : Schematic diagram of the test fixture fasteners; Figure 10 : Diagram of the test bench; Figure 11 Diagram of an electrostatic sensor; Figure 12 Assembly diagram of the back frame and legs with the test bench body; Figure 13 Assembly diagram of fasteners and test bench body; Figure 14 Assembly diagram of the spine plate and L-shaped pressure plate with the test bench body; Figure 15 Actual photos of the tooling; Among them: 1-test fixture, 2-electrostatic sensor, 3-testing device, 4-testing platform body, 11-back frame, 12-ridge plate, 13-L-shaped pressure plate, 14-fastener, 15-support leg. Detailed Implementation

[0019] This invention patent proposes a clamping fixture for electrostatic sensors used in speed measurement, aiming to solve three problems existing in the speed measurement process of electrostatic sensors: 1) Addressing the shortcomings of traditional fixing methods: In electrostatic sensor speed measurement, traditional methods involve simple pasting or binding to fix the electrostatic sensor. During the test, vibration, impact, or the impact force of two-phase fluids may cause the sensor to loosen, shift, or even fall off, thus affecting the stability and accuracy of the measurement signal. The mechanical structure of the clamping fixture can fix the electrostatic sensor in a designated position, ensuring the stability and reliability of the sensor even in complex environments such as high vibration and high-speed airflow, and ensuring the continuity and stability of the measurement signal. 2) Solving the problem of installation deviation: Traditional installation methods are difficult to guarantee the accuracy of the sensor installation position, leading to deviations in the measurement signal and affecting the accuracy of speed measurement. The clamping fixture can accurately position the sensor, ensuring that the sensor is in the optimal measurement position, and allows for convenient fine-tuning. 3) Solving the problem of adaptability to the test environment: The test environment may include harsh environments such as high temperature, low temperature, humidity, and dust. The clamping fixture enhances the adaptability of the electrostatic sensor. This invention addresses the positioning and installation of an electrostatic sensor in high-temperature, high-speed gas-solid two-phase flow. The design includes a back frame 11, a ridge plate 12, an L-shaped pressure plate 13, fasteners 14, and support legs 15. The ridge plate ensures the electrostatic sensor maintains the correct position during measurement, the L-shaped pressure plate ensures adjustable sensor position, and the back frame and fasteners ensure the fixture's secure hold. The overall structure of the experimental fixture is as follows: Figure 2 As shown.

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments obtained. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0021] The overall assembly drawing of the experimental fixture of this invention is as follows: Figure 1 The test apparatus 3 is placed on the test bench 4. The test bench is a square table shape, and the test apparatus is placed in the center of the table using a ring-shaped fastening device, which is fixed by bolts. Figure 10 As shown; the electrostatic sensor 2 is placed above the test apparatus 3 and engages with the tail cap of the test apparatus. The tail cap of the test apparatus is a protruding hexagon, and the electrostatic sensor is a recessed hexagon. The test apparatus and the sensor are interlocked, and the electrostatic sensor is as follows: Figure 11 As shown; the test fixture 1 is securely connected to the edge of the test bench. Specifically, the back frame 11 and support legs 15 of the test fixture 1 are placed as shown. Figure 12The test bench body 4 shown is secured to the test bench body by fasteners 14 of the test fixture 1. One end of the leg is pressed against the upper surface of the back frame by a bolt, and the other end is in contact with the test bench body by a fastener. Tightening the bolt secures the fastener to the test bench. The fastener and test bench body are assembled as follows: Figure 13 As shown.

[0022] This invention addresses the positioning and installation of electrostatic sensors for high-temperature, high-speed gas-solid two-phase flow. The invention includes a tooling back frame, ridge plate, L-shaped pressure plate, and supports and fasteners. The overall structure of the experimental tooling is as follows: Figure 2 As shown.

[0023] The electrostatic sensor testing fixture includes: a back frame design, a spine plate design, an L-shaped pressure plate design, and support and fastener designs. The back frame mainly provides support for the connection between the sensor and the test bench body. The spine plate is the load-bearing structure connecting the L-shaped pressure plate and the back frame. The L-shaped pressure plate is the load-bearing structure for fixing the electrostatic sensor. The supports and fasteners are used to securely connect the back frame and the test bench body.

[0024] The back frame of the test fixture is the load-bearing component of the entire fixture, and is made of steel with excellent load-bearing performance. The structure is as follows: Figure 3 As shown, the back frame 1 is placed on the test bench body 4 and engaged with the test bench body by fasteners, providing force support for the electrostatic sensor and other test fixtures. The test fixture back frame is as follows... Figure 3 As shown.

[0025] The spine plate is a rectangular metal plate with a central slot, placed in the center of the profile frame. A narrow rectangular slit runs through the center, aligned with the center of the sensor top cover. It is made of steel. The central slot allows the bolts to move up and down to ensure a secure fit when the L-shaped pressure plate is adjusted. It serves as the connecting component between the back frame and the L-shaped pressure plate. The spine plate structure is as follows: Figure 4 As shown. The spine plate and back frame are joined by welding to ensure load-bearing strength, and are installed with the back frame as follows. Figure 5 As shown.

[0026] The L-shaped pressure plate has an L-shaped structure. It connects the electrostatic sensor to the test fixture via a ridge plate. The L-shaped pressure plate has double bolt holes. Bolts are passed through the ridge plate slots. The height of the L-shaped pressure plate is adjusted, and it is slowly pressed down until it is in full contact with the sensor top cover surface. The lower end contacts and presses firmly against the sensor top cover. Then, the bolts are tightened to secure the L-shaped pressure plate, ensuring sensor stability during flame jetting of the test specimen. The stress on the top cover must be observed at this time. If visible deformation occurs, the test must be stopped immediately and a higher rigidity L-shaped pressure plate should be replaced. The structure of the L-shaped pressure plate is as follows: Figure 6 As shown, the backplate mounting structure is as follows Figure 7 As shown.

[0027] The back frame, spine plate, and L-shaped pressure plate are fixed to the back frame by support legs and fasteners. The support legs are connected to the back frame by welding. The test fixture support legs are as follows: Figure 8 As shown.

[0028] The outriggers are fastened to the test bench body with saddle-shaped fasteners containing bolt holes. The bolts secure the outriggers to the test bench body. The fastener structure is as follows: Figure 9 As shown.

[0029] Place a ridge plate and an L-shaped pressure plate above the electrostatic sensor, and press the sensor and tester firmly together. Secure the L-shaped pressure plate to the ridge plate with bolts. The assembly result is as follows. Figure 14 As shown.

[0030] This invention discloses a clamping fixture for an electrostatic sensor used in speed measurement. The feasibility of the fixture has been verified through testing. The actual fixture is shown below. Figure 15 As shown.

[0031] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations to the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A clamping fixture for an electrostatic sensor used in speed measurement, characterized in that: It includes a back frame (11), a spine plate (12), an L-shaped pressure plate (13), fasteners (14) and support legs (15). The back frame (11) is the load-bearing component of the entire tooling. The back frame (11) is placed on the test bench and is fixedly connected to the test bench by fasteners (14). The support leg (15) is vertically fixed to the frame of the back frame (11) by fasteners, and the support leg (15) is fixedly connected to the test bench body by fasteners (14). The spine plate (12) is fixedly connected to the two sides of the back frame at both ends, forming an L-shaped pressure plate and a load-bearing structure for connecting the back frame. The L-shaped pressure plate (13) has an "L" shaped structure. It connects the electrostatic sensor and the test fixture through the ridge plate and serves as a fixed load-bearing structure for the electrostatic sensor.

2. The electrostatic sensor clamping fixture for speed measurement according to claim 1, characterized in that: The spine plate (12) is a rectangular metal plate placed in the center of the back frame, with a narrow rectangular slit in the middle, and the slit aligned with the center of the sensor top cover.

3. The electrostatic sensor clamping fixture for speed measurement according to claim 1, characterized in that: The L-shaped pressure plate has double bolt holes. By passing bolts through the ridge plate opening, the position and height of the L-shaped pressure plate can be adjusted. By tightening the bolts, the stability of the sensor during flame jetting of the test specimen can be achieved.

4. The electrostatic sensor clamping fixture for speed measurement according to claim 1, characterized in that: The spine plate is joined to the back frame at both ends by welding to ensure load-bearing strength.

5. The electrostatic sensor clamping fixture for speed measurement according to claim 1, characterized in that: The fastener (14) is saddle-shaped and has bolt holes, and is fastened to the test bench body by bolt clamping.

6. The electrostatic sensor clamping fixture for speed measurement according to claim 1, characterized in that: The outrigger (15) is welded perpendicularly to the back frame (11).

7. The electrostatic sensor clamping fixture for speed measurement according to claim 1, characterized in that: The bottom edge of the back frame is the same length as the test bench surface, which facilitates the quick fixation of the test fixture with fasteners.

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