A wireless measuring device and method for parallelism of rotary kiln axis

Abstract

The invention relates to a wireless measuring device for the parallelism of a rotary kiln axis, which belongs to the field of parallelism measurement and comprises a control system installation part and a measurement target combination part; the control system installation part comprises a cylindrical shell, a control system is arranged inside the shell, a human-machine interaction module is arranged at one end of the shell, and a wedge groove of a locking mechanism is arranged at the other end; the measurement target combination part is a cylinder, a wedge block of a locking mechanism is arranged at one end, and a high-temperature resistant magnet is arranged at the other end; the control system installation part and the measurement target combination part are detachably connected through the locking mechanism, and the axes of the control system installation part and the measurement target combination part are in the same straight line; the human-machine interaction module comprises a display module, an operation module and a switch connected to a controller, the display module is used for displaying currently measured data information, device running time and battery power; the operation module is used for manually controlling the control module, and the switch is used for managing the power supply of the control system.

Description

Technical Field

[0001] The invention belongs to the field of parallelism measurement, and relates to a wireless measuring device and method for the parallelism of a rotary kiln axis. Background Art

[0002] There are currently two measurement methods: chamfer gauge measurement and common device measurement. Chamfer gauge measurement method: The inclination value of the special chamfer gauge is the same as the inclination of the equipment installation. The chamfer gauge is placed on the support roller in the opposite direction, and the frame level is used to measure the level of the chamfer gauge to indirectly obtain the inclination of the support roller. Since the special chamfer gauge has high processing accuracy, the cost is also high; the inclination of the chamfer gauge must be determined according to the inclination requirements of the equipment, and it is a special tool for special use and has poor applicability; chamfer gauge measurement is an indirect measurement method, which is prone to cumulative errors and will eventually lead to installation quality problems. Ordinary device measurement: Step 1, accurately determine the positions of the inclination detection points A and B of the equipment inclination detection surface or the equipment center axis; Step 2, place the vertex of the conical measuring body at point A, and read the reading Ha of the precision level ruler; Step 3, place the vertex of the conical measuring body at point B, and read the reading Hb of the precision level ruler; Step 4, use the following formula to calculate the installation inclination of the rotary kiln support wheel α=Ha-Hb I / L, where L is the distance from point A to point B. Through the above analysis, it can be seen that the inclination gauge measurement is an indirect measurement with a large error, and the ordinary device measurement steps are cumbersome and prone to errors.

[0003] Traditionally, the inclination is measured by using an inclinometer. The inclinometer is placed on the supporting roller in the opposite direction, and the horizontality of the inclinometer is measured using a frame level to indirectly obtain the inclination of the supporting roller. Since the processing precision of the special inclinometer is high, the cost is also high; the inclinometer should be determined according to the inclination requirements of the equipment, and the tool is dedicated and has poor applicability; it is an indirect measurement method, which is prone to cumulative errors and will eventually lead to installation quality problems. Therefore, the existing inclination measurement systems do not meet the use conditions of the dynamic detection of the inclination of the rotary kiln and the high-precision requirements of the detection of the inclination of the rotary kiln, and the online detection technology of the inclination between the rotary kiln wheel belt and the supporting roller is still blank. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a wireless measuring device and method for the parallelism of a rotary kiln axis.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In one aspect, the present invention provides a wireless measuring device for the parallelism of a rotary kiln axis, comprising a control system mounting portion and a measuring target combining portion;

[0007] The control system installation part includes a cylindrical shell, a control system is arranged inside the shell, a human-machine interaction module is arranged at one end of the shell, and a wedge groove of a locking mechanism is arranged at the other end;

[0008] The measurement target coupling part is a cylinder, one end of which is provided with a wedge of a locking mechanism, and the other end is provided with a high temperature resistant magnet;

[0009] The control system mounting portion and the measurement target combining portion are detachably connected via a locking mechanism, and the axes of the control system mounting portion and the measurement target combining portion are in the same straight line;

[0010] The control system includes a controller, an acquisition module, a wireless transmission module, a storage module and a power module. The controller is used to send a wake-up signal to the acquisition module every other measurement cycle to measure the angle data with the horizontal line; the controller is also used to evaluate the measured angle data, generate a measurement strategy and send it to the acquisition module to obtain inclination information, warning signals and wake-up signals; the wireless transmission module is used to communicate with the host computer, and the controller sends the inclination information, warning signals and internal power information to the host computer through the wireless transmission module; the storage module is used to store information not sent by the communication module; the host computer presents the received data in the form of charts; the power module is used to supply power to the controller, the wireless transmission module, the storage module and the communication module, and is also used to generate internal power information after the external power fails, and send it to the host computer through the communication module;

[0011] The human-computer interaction module includes a display module, an operation module and a switch connected to the controller. The display module is used to display the current measured data information, device operating time and battery power; the operation module is used to manually control the control module, and the switch is used to manage the power supply of the control system.

[0012] Furthermore, the control system is fixed in the housing of the control circuit installation part through copper pillars, and the gap between the control circuit board and the housing is filled with aerogel.

[0013] Furthermore, the power module includes a power management chip, which is used to boost the supply voltage and has a battery power display function.

[0014] Furthermore, the wireless communication module is a LoRa module or a Bluetooth module.

[0015] Furthermore, an operating handle is provided on the side of the shell.

[0016] In another aspect, the present invention provides a method for wirelessly measuring the parallelism of a rotary kiln axis, comprising the following steps:

[0017] S1: Connect the measuring device to the axial surface of the object to be measured, the axial direction of the measuring device is the same as the axial direction of the object to be measured, initialize the measuring device, and set the communication protocol of the serial port;

[0018] S2: The angle sensor in the measuring device collects and processes the inclination data of the object to be measured, and transmits it to the host computer through the wireless transmission module LoRa;

[0019] S3: After receiving the inclination data, the host computer saves it in the corresponding file;

[0020] S4: The host computer displays the collected inclination data in the form of text and coordinate curve graph;

[0021] S5: The host computer issues a stop command to suspend acquisition.

[0022] Furthermore, the measuring device processes the inclination data by using a variational mode decomposition algorithm, specifically including:

[0023] S21: setting VMD parameters to obtain multiple IMFs components;

[0024] S22: Clarify the formula of the VMD algorithm after it is effectively transformed from a constrained variational problem to an unconstrained variational problem:

[0025]

[0026] Where f(t) is the original signal to be decomposed, δ(t) is the Dirac distribution, t represents the time script, * represents the convolution operator, α is the quadratic penalty factor, and λ is the Lagrange multiplication operator. k and ω k denote the Kth IMF and the corresponding center frequency, respectively, {u k} represents the set of IMFs {u1, u2, ..., u k} and ω k The set of central frequencies of IMFs {ω1, ω2, ..., ω k}, K is the total number of IMFs, and IMFs with high order K are low-frequency components;

[0027] S23: Initialize modal function Center frequency and the Lagrange multiplication operator λ 1 , at the same time, set n=0, and set n=n+1, and execute the loop;

[0028] S24: Constantly updated and ω k :

[0029]

[0030]

[0031] S25: When the number of modes k=k+1, execute step S24. When k reaches the set value, the state is terminated directly. If not, λ is continuously updated according to the following formula:

[0032]

[0033] Where τ is the update parameter, setting it to 0 can improve fidelity;

[0034] S26: Repeat steps S24-25, stop the loop and output the result when the following conditions are met:

[0035]

[0036] Where ε is the preset threshold;

[0037] S27: Finally, the K-layer IMFs component is obtained, and the Pearson correlation coefficient of the K-layer IMFs component and the original signal sequence is calculated. The specific formula is as follows:

[0038]

[0039] The Pearson correlation coefficient ranges from [-1, +1], negative numbers represent negative correlation, positive numbers represent positive correlation, and 0 represents no correlation. The closer the correlation coefficient is to 0, the weaker the correlation; the closer it is to -1 or +1, the stronger the correlation.

[0040] The beneficial effects of the present invention are as follows: the present invention has a reasonable design, a reliable and simple structure, a small volume, and module centralization can avoid the inconvenience caused by installation, and is convenient for power management of the wireless inclinometer measurement system. The present invention has high precision measurement accuracy and can completely avoid the final error caused by indirect measurement.

[0041] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0043] Figure 1 A schematic diagram of the structure of a levelness measuring device provided by the present invention;

[0044] Figure 2 It is a schematic diagram of the bottom surface of the operating handle layer 3;

[0045] Figure 3 Schematic diagram of the combined layer of the measurement target and the measurement device;

[0046] Figure 4 It is the schematic diagram of the control system;

[0047] Figure 5 This is the front view of the control circuit board;

[0048] Figure 6 This is the back view of the control circuit board;

[0049] Figure 7 This is a flowchart of the inclination measurement program;

[0050] Figure 8 It is the denoising flow chart of variational mode decomposition algorithm;

[0051] Fig. 9 The structure of the LoRa wireless transmission module in the circuit;

[0052] Reference numerals: control circuit protection and user operation layer 1, control circuit protection layer 2, operation handle layer 3, protrusion 2.1, recessed portion 2.2, smooth fixing ring 4, threaded fixing ring 5 DETAILED DESCRIPTION

[0053] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0054] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0055] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0056] A wireless measuring device for the parallelism of the axis of a rotary kiln includes a shell, a control circuit board is arranged in the shell, and the control circuit board includes an angle measurement chip; wherein the shell is set as a cylindrical structure, and the entire cylindrical structure can be divided into four layers; the first layer is a control circuit protection and user operation layer, which provides surface protection for the control circuit board, and is provided with windows such as a boat switch, a key switch, and a display screen. The second layer is a control circuit board support layer, and the control circuit board is fixed to the second layer by a copper column, and the copper column combination provides an open space for placing heat-proof measures such as heat insulation cotton. The Bluetooth module and battery module of the control circuit are included in this layer, and these modules are protected. The third layer is an operating handle layer, and there are arc handles on both sides of this layer for users to hold. The fourth layer is a measurement target and measurement device combination layer, which is combined with the first three layers by mortise and tenon and thread combination, and is combined with the measurement target by magnetism.

[0057] like Figure 1 As shown, the whole is a cylindrical structure, with a control circuit protection and user operation layer 1, which mainly protects the control circuit user interaction interface, and is provided with windows for display, switch, and operation. Control circuit protection layer 2, the control circuit board is connected to this layer by copper column connection. Operation handle layer 3, arc handles are set on both sides of this layer for the convenience of users to hold. The measurement target and measurement device combination layer is connected by mortise and tenon and thread combination. The first two layers can be attributed to the control circuit layer, because of its overall cylindrical structure, there is plenty of space for circuit adjustment or buffering, and it is also convenient for the implementation of heat protection measures such as insulation cotton. The third layer is mainly left for users to hold, and the end of the fourth layer is combined with the measurement target by magnetic attraction, and combined with the first three layers by mortise and tenon structure.

[0058] Figure 2 and Figure 3 For the connection method, Figure 3 The end of the cylindrical structure shown is combined with the measurement target through a ring magnet. A wedge groove is provided on the operating handle layer 3. The wedge groove includes a protruding portion 2.1 and a recessed portion 2.2. Both are semicircular block structures. A thread is processed on the half height of the recessed portion 2.2, and then connected together by the connection method shown in the figure. Figure 3 Insertion of cylindrical structure Figure 2 The middle wide groove rotates again to engage, and the wedges are inserted through Figure 2 and Figure 3 Middle wedge groove, wedge fixed to prevent Figure 3 Cylindrical structure and Figure 2 The structure moves axially and rotates circumferentially, and the smooth fixing ring 4 and Figure 2 The unprocessed threaded part of the middle recessed part 2.2 fits in place to prevent the wedge from moving radially. The threaded fixing ring 5 is processed with threads and fixed with the threads of the recessed part 2.2. The axial rotation of the entire combination device is completely fixed by the wedge, and the inertial force of its rotation will not disturb the threaded connection. The smooth fixing ring connection and the threaded fixing ring connection only play the role of fixing the wedge. Under this structure, the stability of the structural connection can be greatly guaranteed. Figure 3 The middle structure can also be replaced with a device with a heat-insulating protective layer to ensure the feasibility of the entire device in different working environments. In the process of measuring the inclination of the inclination measuring instrument, magnetism is needed to adsorb the measuring instrument on the surface of the measured object, so a main material is also needed, which is the magnet. There are two requirements for the magnet: 1) It has a strong enough attraction to fit the instrument on the surface of the measurement target; 2) It has high temperature resistance and can maintain magnetism when the surface temperature of the cylinder reaches 300°C.

[0059] In the process of measuring the inclination angle, the entire instrument needs to be attached to the surface of the measurement target. However, since the rotary kiln generates huge heat when working, the instrument must withstand a large amount of radiant heat. In order to protect and insulate the sensors and circuit boards inside the instrument, a material that can resist high temperatures and insulate heat must be used. The device circuit board is fixed in the shell with copper columns and screws, as shown in the figure below. The height and diameter of the circuit board are much smaller than Figure 1 The height and diameter of 1 and 2 are large, so there is plenty of free space in the shell. Aerogel is used as the insulation material, and the aerogel is placed to fill the free space of the circuit board in the shell, and the circuit board is completely wrapped by the aerogel. Aerogel is the lightest solid with the best thermal insulation performance in the world. Its pore size is about 20nm, which is smaller than the free path of air (70nm). The air molecules in the pores lose the ability to flow freely, thereby achieving ultra-high thermal insulation performance. By using this insulation material, the direction of heat conduction can be blocked or controlled to achieve the requirements of thermal insulation, heat preservation, and fire prevention. The circuit board placed in the aerogel package can resist the influence of external heat to ensure the normal operation of the device.

[0060] like Figure 4As shown, it is a schematic diagram of a control system, including a controller, which sends a wake-up signal to a data acquisition module and a data processing module every other measurement cycle; evaluates according to the corrected measurement data X, generates a measurement strategy and sends it to the data acquisition module, obtains inclination information, warning signals and wake-up signals and sends them to the communication module, and the data acquisition module and the data processing module automatically enter a dormant state; the communication module sends the inclination information, warning signals and internal power information to the host computer according to the signal strength of the communication signal, and presents it in real time in the form of a data chart; the power supply module is used to provide power to the controller and the communication module, and generates internal power information and sends it to the communication module after the external power supply fails, and the internal power information includes the usable time of the internal power supply. The present invention is reasonably designed and convenient for power management of the wireless inclinometer measurement system.

[0061] The data acquisition module collects the current device angle information in real time. The angle measurement module uses SCA103T-D05, which provides the performance of a horizontal measuring instrument. It interacts with the controller through SPI communication to ensure rapid and reliable data transmission.

[0062] The controller circuit design is reasonably designed according to the chip resources of STM32F103RCT6. It sends a wake-up signal to the data acquisition module every other measurement cycle; evaluates and corrects the collected measurement data X, generates a measurement strategy and sends it to the data acquisition module, obtains the inclination information, early warning signals and wake-up signals and sends them to the communication module. The data acquisition module and the data processing module automatically enter the sleep state.

[0063] The power supply module uses the highly integrated power management chip IP5306 with a boost efficiency of up to 92% and a charging efficiency of up to 91% to ensure the stability of the input power supply and take into account the power charging and discharging efficiency. It boosts the 3.7V power supply lithium battery to a stable 5V to power the main control wireless module and sensors, and has a battery power display function.

[0064] Display module: the measuring device has a display function, which displays the current measured data information, device operation time, battery power and other information;

[0065] The communication module uses the LoRa module for wireless data transmission, which has ultra-long-distance spread spectrum communication, strong anti-interference and ultra-low current consumption. The collected real-time data information is sent to the host computer, and the host computer intuitively displays the current data information in the form of charts.

[0066] Storage module, used to store information not sent by the communication module

[0067] The circuit design is to reasonably design the routing according to the chip resources of STM32F103C8T6, and set the routing thickness according to the current size of the power line. The system uses a main power switch for easy management. The components are distributed around the main control chip to reduce the size of the circuit board and greatly reduce the cost. The circuit component size uses specifications that meet the specifications:

[0068] 1. LQFP-64_10x10x05P STM32F103RCT6 controller

[0069] 2. ESOP-8IP5306 battery management chip

[0070] 3. 6P-2-2.54mm SCA103 inclination sensor pin header interface.

[0071] 4. 6P-2-2.54mm LoRa wireless transmission module pin header interface

[0072] 5. 7P-2-2.54mm OLED LCD display module pin header female interface

[0073] 6. 6x6x9mm light touch independent button

[0074] 7. SOT-223AMS1117 linear regulator (LDO)

[0075] 8. 0603 chip capacitor

[0076] 9. 0603 chip resistor

[0077] 10. 0603 SMD LED

[0078] 11. SMD, 8.65x8.94x3.16mm horizontal Type-C female socket

[0079] The measurement software in the host computer is mainly composed of C language and LabVIEW software. C language is used to write the microcontroller, and LabVIEW is used to complete the implementation of the host computer. In the wireless inclination measurement system, the software function mainly consists of the acquisition and real-time display of measurement data.

[0080] The inclination measurement procedure is as follows Figure 7 As shown, its main functions are:

[0081] 1. Initialize the lower computer and set the communication protocol of the serial port;

[0082] 2. The angle sensor in the lower computer collects the inclination data of the instrument and transmits the collected inclination data to the upper computer through the wireless transmission module LoRA;

[0083] 3. The upper computer communicates with the lower computer through the wireless transmission module LoRA, collects the inclination data transmitted by the lower computer, and saves it in the corresponding file;

[0084] 4. The host computer displays the collected inclination data in the form of text and coordinate curve graphs, so that the data can be displayed clearly and intuitively, and it is convenient to observe, process and analyze the data in real time;

[0085] 5. If a stop command is issued in the host computer, the collection will be suspended.

[0086] The host computer mainly has the detection part display interface, signal acquisition interface, and signal analysis interface. The software can intuitively display the collected signal curve and the detection results

[0087] like Figure 8 As shown, the measuring device uses the variational mode decomposition algorithm to reduce the noise of the collected data. The variational mode decomposition algorithm (VMD) is an adaptive and completely non-recursive mode change signal processing method. VMD can decompose the original data, i.e., a real signal f, into multiple single-component amplitude-frequency modulation signal sequences u k It avoids the endpoint effect and false components encountered in the iteration process, effectively handles nonlinear and non-stationary signals, and has the advantages of good complex data decomposition accuracy and noise resistance.

[0088] S1: The VMD algorithm processes the signal as follows: First, the VMD parameters are set by empirical values ​​to obtain multiple IMFs components.

[0089] The specific steps include:

[0090] S11: First, the formula and parameters of the VMD algorithm after the constrained variational problem is effectively transformed into an unconstrained variational problem are clarified, where f(t) is the original signal to be decomposed, δ(t) is the Dirac distribution, t represents the time script, * represents the convolution operator, α is the quadratic penalty factor, and λ is the Lagrange multiplication operator. k and ω k denote the Kth IMF and the corresponding center frequency respectively. k} represents the set of IMFs {u1, u2, ..., u k} and ω k The set of central frequencies of IMFs {ω1, ω2, …, ω k}. K is the total number of IMFs, and IMFs with high order K are low-frequency components. The specific formula is as follows:

[0091]

[0092] S12: Initialize modal function Center frequency and the Lagrange multiplication operator λ 1 , and set n=0, and set n=n+1, and execute the loop.

[0093] S13: Constantly updated and ω k ; The specific formula is as follows:

[0094]

[0095]

[0096] S14: When the number of modes k=k+1, execute step S13. When k reaches the set value, the process ends directly. If it does not end, λ is continuously updated according to the following formula, where τ is an update parameter. If the fidelity of the decomposed result is low, it can be set to 0. The specific formula is as follows:

[0097]

[0098] S15: Repeat steps S13 to S14, stop the loop and output the result when the following formula is satisfied, where ε is a threshold set in advance;

[0099]

[0100] S16: Through the above analysis, we finally get the K-layer IMFs component. We calculate the Pearson correlation coefficient between the K-layer IMFs component and the original signal sequence. The specific formula is as follows:

[0101]

[0102] The Pearson correlation coefficient ranges from [-1, +1], with negative numbers representing negative correlation, positive numbers representing positive correlation, and 0 representing no correlation. The closer the correlation coefficient is to 0, the weaker the correlation; the closer it is to -1 or +1, the stronger the correlation. Here, the Pearson correlation coefficient range IMF1 to IMFN is taken as the effective component.

[0103] The design of the present invention adopts wireless transmission for data communication, which effectively extends the transmission range and improves the transmission efficiency. In the design of the present invention, the LoRa wireless transmission module is used, such as Fig. 9 The figure shows the structure of the LoRa wireless transmission module in the circuit.

[0104] LoRa solves the contradiction between power consumption and transmission coverage distance. Generally speaking, the transmission distance is positively correlated with the power consumption. The development of LoRa technology has achieved lower power consumption under the same transmission distance conditions, making low power consumption and long distance unified.

[0105] LoRa is the de facto wireless platform for the Internet of Things (IoT). Semtech’s LoRa chipsets connect sensors to the cloud, enabling real-time communication of data and analytics to improve efficiency and productivity.

[0106] Advantages of LoRa module:

[0107] Long distance:

[0108] Since LoRa uses spread spectrum technology and its sensitivity is closer to Shannon's limit theorem, the signal-to-noise ratio requirement is reduced, so the propagation distance is longer, even 50Km is no problem.

[0109] Anti-interference ability:

[0110] Among all IoT communication technologies, only LoRa technology can demodulate at 20dB noise, while other IoT communication technologies must be higher than a certain intensity of noise to achieve demodulation. Therefore, to some extent, LoRa's anti-interference ability is better than other wireless communication technologies.

[0111] The waveforms of other IoT communication technologies can be captured by devices such as spectrum analyzers. Similarly, these communication data may also be interfered with or forged. However, LoRa technology has good concealment and anti-interference characteristics and strong physical layer security features.

[0112] Low Power Consumption:

[0113] In fact, power consumption has always been the biggest competitive point in wireless communication technology. This is because most long-distance access scenarios require battery power, and the battery life directly affects the user experience. The current of LoRaWan is even lower than 1μA in sleep mode, only 45mA when transmitting a 17dBm signal, and only 5mA when receiving a signal.

[0114] Easy to deploy:

[0115] According to the introduction, LoRa can not only plan and deploy the network according to application needs, but also reasonably deploy base stations according to the terminal location based on the on-site environment. LoRa's network expansion is very simple, and the coverage can be enhanced or expanded at any time according to the changes in the node scale. LoRa has triple security from the physical layer, network layer to the application layer, so it meets various data privacy requirements.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A wireless measuring device for the parallelism of a rotary kiln axis, characterized in that: It includes a control system installation part and a measurement target combination part; The control system installation part includes a cylindrical shell, a control system is arranged inside the shell, a human-machine interaction module is arranged at one end of the shell, and a wedge groove of a locking mechanism is arranged at the other end; The measurement target coupling part is a cylinder, one end of which is provided with a wedge of a locking mechanism, and the other end is provided with a high temperature resistant magnet; The control system mounting portion and the measurement target combining portion are detachably connected via a locking mechanism, and the axes of the control system mounting portion and the measurement target combining portion are in the same straight line; The control system includes a controller, an acquisition module, a wireless transmission module, a storage module and a power module. The controller is used to send a wake-up signal to the acquisition module every other measurement cycle to measure the angle data with the horizontal line; the controller is also used to evaluate the measured angle data, generate a measurement strategy and send it to the acquisition module to obtain inclination information, warning signals and wake-up signals; the wireless transmission module is used to communicate with the host computer, and the controller sends the inclination information, warning signals and internal power information to the host computer through the wireless transmission module; the storage module is used to store information not sent by the communication module; the host computer presents the received data in the form of charts; the power module is used to supply power to the controller, the wireless transmission module, the storage module and the communication module, and is also used to generate internal power information after the external power fails, and send it to the host computer through the communication module; The human-computer interaction module includes a display module, an operation module and a switch connected to the controller, wherein the display module is used to display the current measured data information, the device running time and the battery power; the operation module is used to manually control the control module, and the switch is used to manage the power supply of the control system; The measuring steps of the wireless measuring device for the parallelism of the rotary kiln axis are as follows: S1: Connect the measuring device to the axial surface of the object to be measured, the axial direction of the measuring device is the same as the axial direction of the object to be measured, initialize the measuring device, and set the communication protocol of the serial port; S2: The angle sensor in the measuring device collects and processes the inclination data of the object to be measured, and transmits it to the host computer through the wireless transmission module; S3: After receiving the inclination data, the host computer saves it in the corresponding file; S4: The host computer displays the collected inclination data in the form of text and coordinate curve graph; S5: The host computer issues a stop command to suspend acquisition; The measuring device processes the inclination data by using a variational mode decomposition algorithm, specifically including: S21: setting the variational mode decomposition algorithm parameters to obtain multiple IMFs components; S22: Clearly define the formula of the variational mode decomposition algorithm after effectively transforming the constrained variational problem into the unconstrained variational problem: Where f(t) is the original signal to be decomposed, δ(t) is the Dirac distribution, t is the time script, * is the convolution operator, α is the quadratic penalty factor, and λ is the Lagrange multiplication operator; u k and ω k denote the Kth IMF and the corresponding center frequency, respectively, {u k } represents the set of IMFs {u1, u2, ..., u k } and ω k The set of central frequencies of IMFs {ω1, ω2, ..., ω k }, K is the total number of IMFs, and IMFs with high order K are low-frequency components; S23: Initialize modal function Center frequency and the Lagrange multiplication operator λ 1 , at the same time, set n=0, and set n=n+1, and execute the loop; S24: Constantly updated and ω k : S25: When the number of modes k=k+1, execute step S24. When k reaches the set value, the state is terminated directly. If not, λ is continuously updated according to the following formula: Where τ is the update parameter, setting it to 0 can improve fidelity; S26: Repeat steps S24-25, stop the loop and output the result when the following conditions are met: Where ε is the preset threshold; S27: Finally, the K-layer IMFs component is obtained, and the Pearson correlation coefficient of the K-layer IMFs component and the original signal sequence is calculated. The specific formula is as follows: The Pearson correlation coefficient ranges from [-1, +1], negative numbers represent negative correlation, positive numbers represent positive correlation, and 0 represents no correlation. The closer the correlation coefficient is to 0, the weaker the correlation; the closer it is to -1 or +1, the stronger the correlation.

2. The rotary kiln axis parallelism wireless measuring device according to claim 1, characterized in that: The control system is fixed in the shell of the control circuit installation part through copper columns, and the gap between the control circuit board and the shell is filled with aerogel.

3. The wireless measuring device for parallelism of rotary kiln axis according to claim 1 is characterized in that: The power module includes a power management chip, which is used to boost the supply voltage and has a battery power display function.

4. The wireless measuring device for parallelism of rotary kiln axis according to claim 1 is characterized in that: The wireless transmission module is a LoRa module or a Bluetooth module.

5. The rotary kiln axis parallelism wireless measuring device according to claim 1, characterized in that: An operating handle is also provided on the side of the shell.

Images