CN104833301B - A kind of insulator surface RTV coating thickness measuring devices - Google Patents

Abstract

The invention discloses an insulator surface RTV spray thickness measuring device, which comprises a first lever arm and a second lever arm hinged together, a first pressure head and a sensor are arranged on the first lever arm, and a first pressure head and a sensor are arranged on the second lever arm. There is a second indenter arranged opposite to the first indenter and a measuring head arranged opposite to the sensor, and also includes an elastic clamping device for pressing the first indenter and the second indenter into contact, and the sensor is connected with signal processing module. When measuring, separate the two indenters and put the insulator sheet between the two indenters, the distance change between the two indenters is converted into the distance change between the sensor and the measuring head and the sensor The signal processing module can calculate the thickness of the insulator sheet according to the change of the sensing signal. The measured difference in thickness of the insulator sheet before and after spraying RTV is the thickness of the RTV coating. The invention does not need to destroy the RTV coating, and can accurately and rapidly measure the thickness of the RTV coating.

Description

A device for measuring the thickness of RTV spray coating on the surface of insulators

technical field

The invention relates to the technical field of electric equipment, in particular to an insulator surface RTV spraying thickness measuring device.

Background technique

In the long-term operation of the insulator, some dirt will adhere to the surface. When encountering severe weather such as dew, fog, and drizzle, the soluble substances in the dirt will gradually dissolve in water, forming a dirty layer on the surface of the insulator, making the surface of the insulator conductive. The rate increases, the leakage current increases, and the partial discharge on the surface of the insulator develops into an arc flashover (pollution flashover) under the action of an external electric field. RTV coatings have excellent hydrophobicity and hydrophobic migration. After spraying RTV coatings on the surface of insulators, the coatings will solidify and form a film after contacting water molecules in the air, making the outer insulating surface of insulators also hydrophobic, which greatly improves the power transmission and transformation equipment. Pollution flashover voltage, thereby reducing the occurrence of pollution flashover.

Standard T627-2012 "Room Temperature Curing Anti-Pollution Flashover Coatings for Insulators" has clear regulations on the spraying thickness of RTV coatings. When the coating thickness does not meet the specified requirements, the hydrophobicity of the insulator surface is poor, and the anti-pollution flashover effect is not obvious. If the RTV coating is too thick, it will greatly increase the cost and cause unnecessary waste.

At present, two methods are generally used to measure the thickness of the RTV coating: the first method is to insert the probe into the RTV coating, and use a micrometer to measure the height difference between the tip of the probe and the surface of the RTV coating, which is the thickness of the RTV coating . This method must ensure that the probe is perpendicular to the surface of the insulator, and the measurement error is relatively large. The second method is to cut a slice on the surface of the insulator after the coating is completely dry, and then use a vernier caliper to measure the thickness of the slice. This method not only destroys the RTV coating, but also cannot slice and sample various parts. The measurement results It is one-sided. It can be seen that the existing measurement technology has large errors, one-sided measurement and low efficiency.

Therefore, how to quickly and accurately measure the thickness of the RTV spraying on the surface of the insulator is a technical problem to be solved by those skilled in the art.

Contents of the invention

In view of this, the present invention provides a device for measuring the thickness of RTV spraying on the surface of an insulator, which can accurately and quickly measure the thickness of RTV spraying on the surface of an insulator.

In order to solve the above problems, the present invention provides an insulator surface RTV spraying thickness measuring device, comprising a first lever arm and a second lever arm hinged together, the first lever arm is provided with a first pressure head and a sensor, The second lever arm is provided with a second indenter arranged opposite to the first indenter and a measuring head arranged opposite to the sensor, and also includes a function for connecting the first indenter and the second indenter The pressure head presses the elastic clamping device in contact, and the sensor is connected with a signal processing module.

Preferably, in the above insulator surface RTV spraying thickness measurement device, the sensor is a magnetic field sensor, the measuring head is a magnetic column, and the signal processing module includes an analog-to-digital conversion module connected to the magnetic field sensor, connected to the A micro-processing module of the analog-to-digital conversion module and a display module connected to the micro-processing module.

Preferably, in the above insulator surface RTV spraying thickness measuring device, the first lever arm and the second lever arm are arranged crosswise and hinged at the intersection.

Preferably, in the above insulator surface RTV spray thickness measuring device, one end of the first lever arm is provided with the first indenter and the other end is provided with the magnetic field sensor, and one end of the second lever arm is provided with The second indenter is provided with the magnetic column at the other end.

Preferably, in the above insulator surface RTV spraying thickness measuring device, the first pressure head is a first pressure wheel rotatably connected to the first lever arm, and the second pressure head is a rotatably connected The second pressure roller on the second lever arm.

Preferably, in the above insulator surface RTV spray thickness measuring device, the elastic clamping device is a tension spring, one end of the tension spring is connected to the first lever arm and the other end is connected to the second lever arm.

Preferably, in the above insulator surface RTV spraying thickness measuring device, the hinge of the first lever arm and the second lever arm is provided with a rotating shaft, and the distances from the magnetic field sensor and the magnetic column to the rotating shaft are respectively greater than the distance between the first pressure head and the second pressure head from the rotating shaft.

Preferably, in the above insulator surface RTV spraying thickness measurement device, the signal processing module further includes a signal amplification module connected between the magnetic field sensor and the analog-to-digital conversion module.

Preferably, in the above insulator surface RTV spraying thickness measurement device, the signal processing module further includes a power supply module and a voltage conversion module.

Preferably, in the above insulator surface RTV spraying thickness measuring device, an insulating rod is connected to the hinge of the first lever arm and the second lever arm.

In a kind of insulator surface RTV spraying thickness measuring device provided by the present invention, comprise the first lever arm and the second lever arm that are hinged together, the first lever arm is provided with the first indenter and sensor, and the second lever arm is provided with There is a second indenter arranged opposite to the first indenter and a measuring head arranged opposite to the sensor, and also includes an elastic clamping device for pressing the first indenter and the second indenter into contact, and the sensor is connected with signal processing module. When the measuring device is not measuring, under the action of the elastic clamping device, the first indenter and the second indenter are pressed into contact. When measuring the thickness of the insulator sheet, the first indenter and the second indenter are separated and the insulator sheet is placed between the two indenters, and the distance between the first indenter and the second indenter is compared to the unmeasured When the distance changes, the distance change drives the sensor and the measuring head to move through the first lever arm and the second lever arm, thereby changing the distance between the sensor and the measuring head, and then changing the sensing signal between the sensor and the measuring head, The sensing signal measured by the sensor is output to the signal processing module for calculation and processing, and finally the insulator sheet can be obtained according to the change of the sensing signal, the distance change between the sensor and the measuring head, and the corresponding relationship between the distance between the sensor and the first indenter. thickness. The thickness value of the RTV sprayed layer can be obtained by subtracting the thickness of the insulator sheet before spraying RTV from the measured thickness of the insulator sheet.

It can be seen that the present invention effectively combines the mechanical measuring mechanism with the signal processing module, without destroying the RTV coating, and is easy to operate, and can accurately and quickly measure the thickness of the RTV coating.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural schematic diagram of the mechanical measuring mechanism of the insulator surface RTV spraying thickness measuring device provided in the specific embodiment scheme of the present invention;

Fig. 2 is a block diagram of the layout of the signal processing module in the solution of the specific embodiment of the present invention.

In Figure 1 and Figure 2:

First pressure head-1, second pressure head-2, tension spring-3, first lever arm-4, second lever arm-5, rotating shaft-6, fixed column-7, magnetic field sensor-8, magnetic column- 9.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figure 1 and Figure 2, Figure 1 is a schematic structural diagram of the mechanical measurement mechanism of the insulator surface RTV spraying thickness measuring device provided in the specific embodiment of the present invention, and Figure 2 is the layout of the signal processing module in the specific embodiment of the present invention block diagram.

In a specific embodiment scheme, the present invention provides an insulator surface RTV spraying thickness measuring device, which includes two parts: a mechanical measuring mechanism and a signal processing module. Specifically, the mechanical measuring mechanism includes a first indenter 1, a second indenter 2, an elastic clamping device, a first lever arm 4, a second lever arm 5, a rotating shaft 6, a sensor and a measuring head, the first lever arm 4 and the The second lever arm 5 is hingedly connected, and the first lever arm 4 is provided with the first pressure head 1 and the sensor, and the second lever arm 5 is provided with the second pressure head 2 arranged opposite to the first pressure head 1 and opposite to the sensor. The measuring head is arranged, and the sensor is connected with a signal processing module.

Among them, the first indenter 1 and the second indenter 2 are respectively connected with the first lever arm 4 and the second lever arm 5, and are used to press against the upper and lower sides of the insulator sheet to be measured, so as to obtain the measured position of the insulator sheet. thickness. The first lever arm 4 and the second lever arm 5 are hinged together by the rotating shaft 6. When the device is not measuring, under the action of the elastic clamping device, the first lever arm 4 and the second lever arm 5 will press the first lever arm The head 1 and the second indenter 2 are pressed and contacted to form a tight measuring body. When measuring, the first lever arm 4 and the second lever arm 5 rotate relatively and separate the first indenter 1 and the second indenter 2, so that the insulator sheet to be measured is put into the first indenter 1 and the second indenter. Between the two indenters 2. The sensor and the measuring head can be connected to the first lever arm 4 and the second lever arm 5 through the fixed column 7. The sensor and the measuring head are arranged opposite to each other, and the effect is to detect the sensing signal between the sensor and the measuring head in real time, and send the sensor to the measuring head. The signal is converted into an electrical signal and output to the signal processing module. In order to enable the measuring device to measure the insulator sheet at a high place, preferably, this solution can be connected with an insulating rod at the hinge of the first lever arm 4 and the second lever arm 5, that is, at the rotating shaft 6, and the operator can hold the The insulating rod extends the measuring device to the high insulator sheet for measurement.

When the measuring device is not measuring, under the action of the elastic clamping device, the first indenter 1 and the second indenter 2 are pressed into contact. When measuring the thickness of the insulator sheet, separate the first indenter 1 and the second indenter 2 and put the insulator sheet between the two indenters, the distance between the first indenter 1 and the second indenter 2 is the same Compared with when it is not measured, the distance change drives the sensor and the measuring head to move through the first lever arm 4 and the second lever arm 5, thereby changing the distance between the sensor and the measuring head, and then changing the distance between the sensor and the measuring head. The sensing signal between the sensor and the sensing signal measured by the sensor is output to the signal processing module for calculation and processing, and finally it can be calculated according to the change of the sensing signal, the change of the distance between the sensor and the measuring head, and the distance between the sensor and the first indenter 1. According to the corresponding relationship, the thickness of the insulator sheet is obtained. The thickness value of the RTV sprayed layer can be obtained by subtracting the thickness of the insulator sheet before spraying RTV from the measured thickness of the insulator sheet.

It should be noted that the present invention converts the change of the distance between the two indenters into the change of the distance between the sensor and the measuring head and the change of the sensing signal through the two lever arms. The signal processing module can calculate the insulator according to the change of the sensing signal. slice thickness. Specifically, this solution can use various types of sensors and measuring heads to measure the distance between the two indenters. For example, the combination of ultrasonic sensors and measuring heads can be used to detect ultrasonic sensors and measuring heads in real time through the principle of ultrasonic distance measurement. Or the combination of infrared ranging sensor and measuring head; or the combination of laser ranging sensor and measuring head; the combination of magnetic field sensor and magnetic measuring head can also be used to detect the change of distance by detecting the change of magnetic field signal and so on. Correspondingly, the signal processing module correspondingly connected to the above-mentioned various sensors can adopt the module in the prior art, and those skilled in the art can select the corresponding signal processing module according to different types of sensors, and the function of the signal processing module is to measure the sensor The change of the sensing signal is calculated and processed to obtain the final corresponding change of the distance between the two indenters.

Preferably, the sensor in this solution is a magnetic field sensor 8, and the corresponding measuring head is a magnetic column 9. The magnetic field sensor 8 is used to detect a magnetic field signal and convert it into a voltage signal within a certain range. The function of the magnetic column 9 is It is to establish the detected magnetic field, keep a certain distance from the magnetic field sensor 8 and provide the magnetic field sensor 8 for real-time measurement. As shown in FIG. When the distance between the magnetic field sensor 8 and the magnetic column 9 changes, the magnetic field signal measured by the magnetic field sensor 8 will change accordingly, and then the magnetic field sensor 8 generates an electrical signal from the magnetic field change signal and transmits it to the signal processing module for calculation and processing. The magnetic field sensor 8 measures the distance change by detecting the change of the spatial magnetic field, and its sensitivity is mV/mT, which can accurately measure the thickness of the RTV. Correspondingly, the signal processing module includes an analog-to-digital conversion module, a micro-processing module and a display module. Wherein, the analog-to-digital conversion module is connected to the magnetic field sensor 8 and is used for converting the voltage signal output by the magnetic field sensor 8 from analog to digital. The micro-processing module is connected to the analog-to-digital conversion module, and its function is to calculate and process the digital output of the analog-to-digital conversion module to obtain the thickness of the insulator sheet before and after spraying RTV. The display module is connected to the micro-processing module to display the micro-processing module. Calculation results.

It should be noted that the first lever arm 4 and the second lever arm 5 in this solution can have multiple arrangements, for example, the two lever arms are arranged crosswise, or the ends of the two lever arms are hingedly connected, or one of them The end of the lever arm is hingedly connected to the middle section of another lever arm, etc., and the above several arrangements can achieve the purpose of the present invention, that is, the two lever arms can be hingedly connected, and the angle and distance can be adjusted between the two. Change, so as to drive the relative movement between the two indenters and the sensor and the measuring head. Correspondingly, when the two lever arms adopt the above-mentioned several different arrangements, the arrangement of the first indenter 1 and the second indenter 2 as well as the sensor and the measuring head will also have different choices, for example, when the two lever arms When the ends are hingedly connected, the first indenter 1 and the sensor can be arranged sequentially along the first lever arm 4, or at the same position of the first lever arm 4, provided that the work of the sensor cannot be affected during measurement.

In order to make the measuring device more convenient to operate and to keep the work of the sensor from being affected by the indenter measurement, preferably, in this solution, the first lever arm 4 and the second lever arm 5 are arranged crosswise and hinged at the intersection by a rotating shaft 6 .

It should be noted that, using the two lever arms arranged crosswise, there are many options for the arrangement of the first indenter 1 and the second indenter 2 as well as the sensor and the measuring head. For example, the two indenters, the sensor and the measuring The heads are all arranged on one side of the rotating shaft 6, and they can also be divided into both sides of the rotating shaft 6. Preferably, this solution adopts the above-mentioned second arrangement, that is, one end of the first lever arm 4 is provided with a first indenter 1 and the other end is provided with a magnetic field sensor 8, and one end of the second lever arm 5 is provided with a second indenter 2 and the other end is provided with a magnetic column 9. As shown in Figure 1, the first indenter 1 and the second indenter 2 are located on the right side of the rotating shaft 6, and the sensor and measuring head are located on the left side of the rotating shaft 6, and the two sides will not interfere with each other during measurement, which improves the operating efficiency Convenience and reliability.

It should be noted that the first indenter 1 and the second indenter 2 in this solution can adopt the structure of a pressing block, or a structure of a roller or other shapes. Preferably, the first indenter 1 in this solution is The first pressure wheel is rotatably connected to the first lever arm 4 , and the second pressure head 2 is a second pressure wheel rotatably connected to the second lever arm 5 . With this setting, when measuring the thickness of the insulator sheet, the insulator sheet can be directly inserted between the two pressure rollers, and the insulator sheet can be easily clamped between the two pressure rollers by using the relative rotation of the two pressure rollers. between.

It should be noted that the function of the elastic clamping device in the present invention is to tightly press the first indenter 1 and the second indenter 2 into contact, and can tightly clamp the two indenters when measuring the insulator sheet Insulator sheet to ensure measurement accuracy. Specifically, the elastic clamping device can be implemented in a variety of structural forms, such as tension springs, elastic reeds at the rotating shaft 6, or elastic rubber bands. Preferably, the elastic clamping device in this specific embodiment is a tension spring 3, one end of the tension spring 3 is connected to the first lever arm 4 and the other end is connected to the second lever arm 5. A lever arm clamps the first indenter 1 and the second indenter 2.

It should be noted that when the measuring device measures the thickness of the RTV, the distance change between the two indenters is converted into the distance change between the magnetic field sensor 8 and the end surface of the magnetic column 9 through the lever arm. Therefore, the distance between the magnetic field sensor 8 and the rotating shaft 6 and the distance between the first indenter 1 and the rotating shaft 6 will affect the measurement accuracy and results of the magnetic field sensor 8 . Because the thickness of RTV is generally small, therefore, in order to make the magnetic field sensor 8 can detect the change of thickness sensitively, preferably, this scheme designs the distance between the magnetic field sensor 8 and the magnetic column 9 and the rotating shaft 6 to be respectively greater than the first The distance between the pressure head 1 and the second pressure head 2 and the rotating shaft 6 . In this way, by increasing the distance between the magnetic field sensor 8, the magnetic column 9 and the rotating shaft 6, making it larger than the distance between the center of the two indenters and the rotating shaft 6, the relative movement distance between the two indenters can be adjusted. magnification, thereby increasing the measurement sensitivity.

It should be noted that the electrical signal output by the above-mentioned magnetic field sensor 8 is sent to the analog-to-digital conversion module. In order to facilitate the processing by the analog-to-digital conversion module, preferably, this solution is also connected with a signal amplifier between the magnetic field sensor 8 and the analog-to-digital conversion module. module, the signal amplification module can amplify the analog signal measured by the magnetic field sensor 8, thereby making it easier for the analog-to-digital conversion module to complete the conversion of the analog signal to a digital signal, for the microprocessor in the micro-processing module to perform calculation processing and measure the speed Fast and efficient. The microprocessor outputs calculation results to the display module, providing a friendly human-computer interaction interface.

It should be noted that the signal processing module in this solution also includes a power supply module and a voltage conversion module, and the power supply module can be a battery pack. The power supply module is respectively connected with the magnetic field sensor 8, the signal amplification module, the analog-to-digital conversion module, and the microprocessing module to provide working power for each module. Since the power supply voltage required by each module may be different, this solution sets the voltage conversion module to convert the voltage of the battery pack into a variety of voltage values to supply power for different modules, which is simple and reliable.

The working principle and working process of the measuring device of the present invention are introduced in detail below:

In the insulator surface RTV spraying thickness measuring device of the present invention, when not measuring, under the action of the tension spring 3, the first lever arm 4 and the second lever arm 5 press the first pressure wheel and the second pressure wheel tightly. When measuring the thickness of the insulator sheet, the insulator sheet enters between the first pressure wheel and the second pressure wheel under the rotation of the two, and the distance between the first pressure wheel and the second pressure wheel changes, and the distance change is passed through the first lever The arm 4 and the second lever arm 5 drive the magnetic field sensor 8 and the magnetic column 9 to move, changing the distance between the magnetic field sensor 8 and the end face of the magnetic column 9 , thereby changing the magnetic field at the position of the magnetic field sensor 8 . The magnetic field sensor 8 measures the change of the distance between the magnetic field sensor 8 and the end surface of the magnetic column 9 by detecting the change of the spatial magnetic field.

The analog signal measured by the magnetic field sensor 8 is output to the signal amplification module for amplification, and then the analog signal is converted to a digital signal by the analog-to-digital conversion module, which is used for calculation and processing by the micro-processing module. According to the corresponding relationship between the change of the magnetic field intensity and the distance between the magnetic field sensor 8 and the end face of the magnetic column 9, combined with the distance between the magnetic field sensor 8, the first pressure wheel and the rotating shaft 6, the thickness of the insulator sheet is calculated. The thickness value of the RTV sprayed layer can be obtained by subtracting the thickness of the insulator sheet before spraying RTV from the measured thickness of the insulator sheet. The microprocessor outputs calculation results to the display module for human-computer interaction.

It can be seen that the present invention effectively combines the mechanical measurement mechanism with the signal processing module, has a simple structure, is convenient to use, does not need to destroy the RTV coating during measurement, and is easy to operate, can accurately and quickly measure the thickness of the RTV coating, and has a friendly human-computer interaction interface , The power supply is reliable.

In addition, it should be pointed out that the various modules such as the magnetic field sensor, signal amplification module, analog-to-digital conversion module, microprocessor, and display module used in the present invention are all existing electronic component modules. Selective configuration is performed in the prior art, so this article does not specifically limit the model of each module.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the 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 invention. Therefore, the present invention will not 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 (6)

1. a kind of insulator surface RTV coating thickness measuring devices, which is characterized in that including the first hinged lever arm (4) and the second lever arm (5), first lever arm (4) are equipped with the first pressure head (1) and sensor, second lever arm (5) the second pressure head (2) positioned opposite and the measurement positioned opposite with the sensor with first pressure head (1) are equipped with Head further includes the elastic clamp device for first pressure head (1) and second pressure head (2) to be pressed into contact with, the biography Sensor is connected with signal processing module；

The sensor is magnetic field sensor (8), and the measurement head is magnetic posts (9), and the signal processing module includes connection Analog-to-digital conversion module in the magnetic field sensor (8), the micro treatment module for being connected to the analog-to-digital conversion module and connection In the display module of the micro treatment module；

The signal processing module further includes power supply module and voltage transformation module；

First pressure head (1) is the first pinch roller being rotatably connected on first lever arm (4), second pressure head (2) the second pinch roller to be rotatably connected on second lever arm (5)；

The hinged place of first lever arm (4) and second lever arm (5) is equipped with shaft (6), the magnetic field sensor (8) It is respectively greater than first pressure head (1) and second pressure head (2) with distance of the magnetic posts (9) apart from the shaft (6) Distance apart from the shaft (6).

2. insulator surface RTV coating thickness measuring devices according to claim 1, which is characterized in that first thick stick It lever arm (4) and the second lever arm (5) arranged crosswise and is hinged in infall.

3. insulator surface RTV coating thickness measuring devices according to claim 2, which is characterized in that first thick stick One end of lever arm (4) is equipped with first pressure head (1) and the other end is equipped with the magnetic field sensor (8), second lever arm (5) one end is equipped with second pressure head (2) and the other end is equipped with the magnetic posts (9).

4. insulator surface RTV coating thickness measuring devices according to claim 1, which is characterized in that the elastic clip Tight device is tension spring (3), and one end of the tension spring (3) is connected to first lever arm (4) and the other end connects In second lever arm (5).

5. insulator surface RTV coating thickness measuring devices according to any one of claims 1 to 4, which is characterized in that institute It states signal processing module and further includes the signal amplification mould being connected between the magnetic field sensor (8) and the analog-to-digital conversion module Block.

6. insulator surface RTV coating thickness measuring devices according to any one of claims 1 to 4, which is characterized in that institute The hinged place for stating the first lever arm (4) and second lever arm (5) is connected with insulating bar.