Low-power-consumption remote measuring instrument for field operation load of agricultural machinery

Abstract

The invention discloses an agricultural machinery field operation load low-power-consumption remote sensing instrument, and relates to the technical field of agricultural machinery monitoring. Comprising a sensor module which comprises a suspension type machine tool sensor, a rotation power measurement sensor and a traction type machine tool sensor and is used for measuring various load parameters in agricultural machine field operation; the data collector integrates an analog signal channel, a torque / speed synthesis channel, a rotating speed signal channel and an angle signal channel and is used for collecting signals of the sensor modules; the host is in wireless communication connection with the data collector, and the collected data are processed and analyzed through the collection software. According to the agricultural machinery field operation load low-power-consumption remote sensing instrument, the limitation of a traditional agricultural machinery monitoring technology is broken through in the aspects of monitoring comprehensiveness, data precision, power consumption control, convenience, intelligent processing and the like, and remarkable progress is brought to agricultural machinery monitoring and management in modern agricultural production.

Description

Technical Field

[0001] The present invention belongs to the technical field of agricultural machinery monitoring, and particularly relates to a low-power telemeter for agricultural machinery field operation load. Background Art

[0002] In modern agriculture, the wide use of agricultural machinery has greatly improved agricultural production efficiency. However, when agricultural machinery is operating in the field, the real-time monitoring of parameters such as its load status and power consumption is crucial for evaluating operation effects, optimizing operation strategies, and ensuring the safety of agricultural machinery. Traditional monitoring methods often rely on manual observation and empirical judgment, which are not only inefficient but also difficult to obtain accurate and comprehensive data.

[0003] Currently, there are some monitoring devices for agricultural machinery operations on the market, but these devices often have problems such as high power consumption, complex installation, and insufficient measurement accuracy. Especially in the complex and changeable field environment, the stability and reliability of these devices are often challenged. In addition, the existing monitoring devices also have limitations in data processing and analysis, and it is difficult to meet the requirements of modern agriculture for data visualization and intelligent management.

[0004] Therefore, developing a telemeter that can real-time monitor the load of agricultural machinery in the field, has low power consumption, is easy to install, and has strong data processing capabilities is of great significance for improving agricultural production efficiency, reducing energy consumption, and ensuring the safety of agricultural machinery. Summary of the Invention

[0005] The present invention aims to overcome the many drawbacks of the above traditional agricultural machinery monitoring technologies, and provides a low-power telemeter for agricultural machinery field operation load. By integrating a variety of high-precision sensors, optimizing data acquisition and transmission methods, and low-power design, it realizes all-round and high-precision load monitoring of agricultural machinery field operations, and at the same time ensures that the system can operate stably for a long time, providing strong technical support for modern agricultural production.

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions: The present invention is a low-power telemeter for agricultural machinery field operation load, including: A sensor module, including a suspended implement sensor, a rotational power measurement sensor, and a trailed implement sensor, for measuring various load parameters in agricultural machinery field operations; A data collector, integrating an analog signal channel, a torque / speed synthesis channel, a rotational speed signal channel, and an angle signal channel, for collecting the signals of the above sensor module; A host and acquisition software, the host is wirelessly connected to the data collector, and processes and analyzes the collected data through the acquisition software.

[0007] As a preferred technical solution of the present invention, the suspended implement sensor includes: At least one upper drawbar sensor for measuring the tensile or compressive force applied to the upper drawbar and its relative angle with the ground; At least two lower hitch pin sensors, respectively installed at the hitch points of the left and right lower hitch bars of the tractor, for measuring the draft resistance of the implement.

[0008] As a preferred technical solution of the present invention, the upper drawbar sensor includes a tensile-compressive force sensor and an angle sensor, and connects the tensile-compressive force signal interface and the angle signal interface to the corresponding channel interfaces of the data collector through a communication cable.

[0009] As a preferred technical solution of the present invention, the lower hitch pin sensor is a shear force sensor that is symmetric left and right, and the tensile-compressive force signal interfaces on its left and right sides are connected to the corresponding channel interfaces of the data collector through a communication cable.

[0010] As a preferred technical solution of the present invention, the rotational power measurement sensor adopts an extended output shaft structure, simultaneously tests the dynamic torque and rotational speed of the output shaft, is installed between the power take-off shaft of the tractor and the agricultural implement to be measured, and connects the torque and rotational speed signal interfaces to the corresponding channel interfaces of the data collector through a communication cable.

[0011] As a preferred technical solution of the present invention, the trailed implement sensor includes a shear force sensor and an angle sensor. The shear force sensor is symmetrically installed on the left and right lower hitch pins of the drawbar, and the tensile-compressive force signal interfaces on its left and right sides are connected to the corresponding channel interfaces of the data collector through a communication cable.

[0012] As a preferred technical solution of the present invention, the data collector is equipped with an antenna for wireless data transmission, is powered by a lithium-ion battery or a lithium polymer battery, the battery compartment has a pull-out or snap-on structure, and is provided with a standard charger interface and a vehicle charger interface.

[0013] As a preferred technical solution of the present invention, the acquisition software realizes real-time data display and visualization, data curve plotting and analysis, data calibration and calibration, data display range and sampling frequency setting, data anomaly detection and alarm, data storage and management, user permission management and operation log recording.

[0014] As a preferred technical solution of the present invention, the operation interface of the acquisition software adopts a graphical user interface design, and the acquisition software has functions of corresponding data and channel setting, virtual channel setting, and display data setting.

[0015] As a preferred technical solution of the present invention, the data calibration and calibration function of the acquisition software allows users to perform personalized calibration operations for sensors of different models and different accuracy levels, and has a data calibration compensation function, which can perform real-time calibration compensation on the data collected by the sensors according to a preset calibration period or a calibration instruction manually triggered by the user.

[0016] The present invention has the following beneficial effects: Through the collaborative work of various types of sensors, the comprehensive monitoring of the agricultural machinery field operation load is realized. The suspended implement sensor can not only capture the force and angle information of the upper pull rod, but also accurately measure the implement draft resistance; the rotational power measurement sensor can reflect the torque and speed of the power take-off shaft in real time, providing accurate data for the agricultural machinery power transmission efficiency; the trailed implement sensor further supplements the force and attitude monitoring in the trailed operation scenario. Compared with the traditional monitoring means with single and limited parameters, the present invention can provide comprehensive data support for the evaluation of the agricultural machinery operation state, which is helpful to deeply understand the performance of the agricultural machinery in different operation links.

[0017] The data collector is powered by a lithium-ion battery or a lithium polymer battery, and through an optimized power management strategy, such as automatically entering the low-power standby mode when there is no data transmission, and a reasonable circuit design to reduce the static power consumption, the battery life is greatly extended. Compared with the traditional monitoring device using lead-acid batteries with poor power consumption control, the present invention can work continuously and stably during long-term field operations, reducing the trouble of frequent shutdowns due to insufficient battery power and improving the operation efficiency.

[0018] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0022] As Figure 1 shown: The present invention provides a low-power telemeter for agricultural machinery field operation loads, including: a sensor module, including a suspended implement sensor, a rotational power measurement sensor, and a trailed implement sensor, for measuring various load parameters in agricultural machinery field operations; a data collector, integrating an analog signal channel, a torque / speed synthesis channel, a rotational speed signal channel, and an angle signal channel, for collecting the signals of the above sensor module; a host computer and acquisition software, the host computer is wirelessly communicatively connected to the data collector, and processes and analyzes the collected data through the acquisition software.

[0023] A specific application of this embodiment is: The low-power telemeter for agricultural machinery field operation loads of the present invention As Figure 1 shown, the overall structure of this telemeter is compact and exquisitely designed, accurately collecting and processing various load data in agricultural machinery field operations.

[0024] I. Overall Composition of the System The entire telemeter system mainly covers three core parts: a sensor module, a data collector, and a host computer and acquisition software.

[0025] (I) Sensor Module The sensor module, as the front end of data acquisition, is like the "antenna" of agricultural machinery, keenly sensing various operation parameters. Among them, the suspended implement sensor focuses on monitoring the connection part between the tractor and the suspended implement: Top link sensor: Installed on the top link part. In this embodiment, two high-precision top link sensors are selected and symmetrically distributed to ensure the accuracy of measurement.

[0026] Its measurement principle is as follows: According to the principle of tractor traction mechanics, the upper pull rod is a pure two-force rod structure, which is subjected to a tensile or compressive force F1. During field test operations, while measuring the force, the upper pull rod sensor also measures the relative angle α between the upper pull rod and the ground in real time. Therefore, the horizontal traction force received by the upper pull rod can be obtained as F1×cosα. Then, when the direction of the implement draft resistance is taken as the positive direction, the horizontal traction force is positive when the upper pull rod is in tension and negative when it is in compression; the vertical component of the draft resistance received by the upper pull rod is F1×sinα. Then, when the direction of the implement draft resistance is taken as the positive direction, the vertical component of the draft resistance is positive when the upper pull rod is in compression and negative when it is in tension.

[0027] The tension and compression sensor uses a strain gauge sensor, which can accurately sense the tensile or compressive force received by the upper pull rod. The measuring range is 0 - 5000N, and the accuracy can reach ±0.5%FS (full scale). The angle sensor selects a high-precision gyroscope sensor, which can measure the relative angle between the upper pull rod and the ground in real time. The measuring range is 0 - 180°, and the accuracy reaches ±0.1°. These two sensors are connected to the corresponding channel interfaces of the data collector through special anti-interference communication cables at the tension and compression signal interfaces and the angle signal interfaces. The outer layer of the cable is wrapped with a waterproof and wear-resistant rubber sheath to ensure stable signal transmission in the humid and dusty environment of the farmland.

[0028] Lower hitch pin sensors: One is installed on each side, firmly installed at the traction points of the left and right lower hitch rods of the tractor. They use a new type of shear force sensor, whose core sensitive element is a piezoelectric quartz crystal, with high sensitivity and fast response characteristics, and can accurately measure the draft resistance of the implement. The measuring range is 0 - 10000N, and the accuracy is ±1%FS. The tension and compression signal interfaces on both sides of it are connected to the corresponding channel interfaces of the data collector through waterproof and corrosion-resistant communication cables. The cable length is optimized according to the dimensions of common tractor models, which is 2 - 3 meters, ensuring smooth connection and avoiding cable entanglement.

[0029] The rotational power measurement sensor is like a precise "power detective", adopting an extended output shaft structure and being cleverly installed between the power take-off shaft of the tractor and the agricultural implement to be measured. It integrates high-precision torque sensors and speed sensors internally. The torque sensor is based on the magnetoelastic principle and can accurately measure the dynamic torque of the output shaft. The measuring range is 0 - 2000N·m, and the accuracy is ±0.5%FS; the speed sensor uses an optical encoder and can accurately measure the speed. The measuring range is 0 - 3000rpm, and the accuracy is ±0.1%. The torque and speed signal interfaces are connected to the corresponding channel interfaces of the data collector through high-strength communication cables. The cable has good shielding performance to prevent electromagnetic interference during power transmission from affecting the signal quality.

[0030] The sensors for trailed implements focus on the trailed operation scenarios: for the shear force sensors, piezoelectric sensors similar to the lower hitch pin sensors are selected. The hitch pin shear force sensors are symmetrically installed on the left and right of the drawbar (for convenient disassembly and replacement). The left and right hitch pin sensors are respectively installed at the hitch points of the left and right lower links of the tractor. The measuring range is set to 0 - 8000N according to the common force range of trailed implements, with an accuracy of ±0.8%FS. The left and right tension and compression signal interfaces are connected to the corresponding channel interfaces of the data collector through special communication cables; the angle sensor uses an inclination sensor to monitor the towing angle in real time, with a measuring range of 0 - 90° and an accuracy of ±0.2°.

[0031] (2) Data Collector The data collector is like the "data center" of the entire system, integrating analog signal channels, torque / speed synthesis channels, rotational speed signal channels, and angle signal channels, and is specifically responsible for aggregating and sorting out various complex signals from the sensor module.

[0032] Analog Signal Channel: For the analog electrical signals output by sensors such as tension and compression, shear force, etc., there is a complete signal conditioning process. First, the signal enters the preamplifier, and the amplifier amplifies the weak analog signal according to the preset amplification factor to ensure the accuracy of subsequent processing. Then, it passes through an anti-aliasing filter to filter out high-frequency noise interference, prevent signal distortion during the sampling process, and ensure the purity of the data. Finally, the conditioned analog signal is converted into a digital signal by an analog-to-digital converter (ADC) for subsequent unified processing and transmission.

[0033] Torque / Speed Synthesis Channel: For the two key parameters of torque and rotational speed transmitted by the rotational power measurement sensor, professional physical algorithms are used for synthesis processing. According to the mechanical power calculation formula P = Tω (where P is power, T is torque, ω is angular velocity, and the rotational speed and angular velocity can be simply converted), the torque and rotational speed signals are organically integrated according to the physical relationship, so that the two are no longer isolated, providing strong support for the subsequent in-depth analysis of the agricultural machinery power transmission efficiency.

[0034] Rotational Speed Signal Channel and Angle Signal Channel: Respectively use professional circuit components such as counters and phase discriminators to efficiently convert the rotational speed pulse signal into a digital rotational speed value, and accurately convert the angle sensor electrical signal into an accurate angle value to ensure the readability and usability of the data.

[0035] Power Supply and Communication Design: In terms of power supply, lithium-ion batteries or lithium polymer batteries are used as the power source. Compared with traditional lead-acid batteries, they have significant advantages such as high energy density and low self-discharge rate. The battery compartment is innovatively designed as a pull-out or snap-on structure, which greatly facilitates the operator to quickly replace the battery during field operations. At the same time, fully considering the actual usage scenario, a standard charger interface is set to meet the conventional charging needs, and a vehicle-mounted charger interface is also equipped to enable emergency charging using the vehicle power supply during agricultural machinery operations, ensuring the continuous and stable operation of the data collector. In addition, an optimized power management strategy is adopted for power supply management. For example, the battery power is monitored in real time. When the power is lower than the preset low-power threshold, a low-power warning signal is sent to the user (such as displayed on the display screen in the agricultural machinery cab or a sound alarm is issued), reminding the user to charge or replace the battery in time.

[0036] When the agricultural machinery pauses operation or is in an idle state for a long time, the entire telemeter enters a deep sleep state to save electrical energy to the maximum extent. When the agricultural machinery restarts operation or receives an external wake-up signal (such as a polling request from the response center), the power module quickly resumes power supply, and the system re-enters the working state. In terms of communication, a high-performance antenna is equipped, and advanced wireless communication technologies (such as low-power Bluetooth, Wi-Fi, or wireless data transmission modules in specific frequency bands) are adopted to establish a stable and efficient wireless communication connection with the host, getting rid of the cable bondage and enhancing the overall flexibility and adaptability of the system.

[0037] Low-power design strategy Low-power consumption design of the data collector: When the current time is the information collection time point or a polling request sent by the response center is received, the control actuator controls the power module to input electrical energy to the data monitoring module (sensors and data collector), enabling the data monitoring module to enter the collection state; during the period when no information is collected and no polling request is received, the data monitoring module is in a power-off state, thus effectively saving electrical energy.

[0038] Power consumption optimization of the communication module By continuously judging whether the current time point is the upload time point, and at the same time judging whether a polling return request sent by the response center is received. When either of these two judgment conditions is met, the sleep control unit wakes up the communication module, and the telemetry data is uploaded to the response center through the communication module; at other times, the communication module remains in the sleep state to avoid consuming too much electrical energy due to being always in the wake-up state.

[0039] Dynamic data collection frequency adjustment mechanism The microprocessor analyzes the real-time agricultural machinery operation status and load changes based on the telemetry data collected by the data monitoring module and the forecast data returned by the response center stored in the information storage module. When it detects that the operation load is large (such as exceeding the preset load threshold), the microprocessor increases the acquisition frequency of the data monitoring module to obtain more detailed and accurate load change information; when the operation load is small (below the preset load threshold), it appropriately reduces the acquisition frequency to reduce unnecessary data acquisition operations while ensuring data validity and reducing the overall power consumption of the system.

[0040] (3) Main unit and acquisition software As the "brain" of the entire telemeter, the main unit is wirelessly connected to the data collector and uses an industrial-grade embedded computer with powerful data processing capabilities. The main unit is generally a laptop computer with an operating system of Win7 or Win8. The acquisition software installed in the main unit is like an intelligent "data steward": The acquisition software has the following functions: Real-time data display and visualization: The software interface visually displays the data collected by each sensor in the form of charts in real time. For example, it presents the drawbar pull, draft resistance, etc. in the form of dynamic bar charts, enabling the agricultural machinery operator to clearly understand the operation status of the agricultural machinery at a glance.

[0041] Data curve plotting and analysis: It can plot the change curves of various load parameters according to the time series and, through built-in data analysis algorithms such as trend analysis and peak detection, help the agricultural machinery operator analyze the performance changes during the operation of the agricultural machinery and discover potential problems in advance.

[0042] Data calibration and compensation: For sensors of different models and different accuracy grades in field operations, the software provides a convenient calibration operation interface. The user only needs to input parameters such as the sensor model, range, and accuracy according to the prompts, and the software can automatically generate a calibration plan. And it has a data calibration and compensation function. According to the preset calibration period of once every 2 hours or the calibration instruction manually triggered by the user, it performs real-time calibration and compensation on the data collected by the sensor to ensure the accuracy of the data. Data display range and sampling frequency setting: The agricultural machinery operator can set the range of the data display according to actual needs. For example, set the display range of the drawbar pressure to 0 - 3000N to focus more on the current concerned data range; at the same time, it can flexibly adjust the sampling frequency, increasing the sampling frequency to 100Hz during fine operations and setting it to 20Hz during normal operations to balance data accuracy and storage requirements.

[0043] Data anomaly detection and alarm: The software is built with intelligent algorithms to monitor in real time whether the data exceeds the normal range or shows abnormal fluctuations. Once an anomaly is detected, an alarm is immediately issued through the audible and visual alarm on the host, and at the same time, a prominent red flash prompts the agricultural machine operator on the operation interface. For example, when the traction resistance suddenly increases by 50% and lasts for more than 3 seconds, it is determined as an abnormal situation.

[0044] Data storage and management: The collected data is automatically stored in the large-capacity solid-state drive built into the host, and the storage format is a structured database file, which is convenient for subsequent query and export. It is classified and stored according to dimensions such as date and operation type, and users can quickly retrieve historical data through keywords such as time and agricultural machine number.

[0045] User privilege management and operation log recording: To ensure system security and data reliability, the software sets different levels of user privileges. For example, administrators can perform all system settings and data management operations, while ordinary agricultural machine operators can only view real-time data and receive alarm information. At the same time, detailed log information of each user login and operation is recorded, including operation time, operation content, operator, etc., for tracing the system usage. The operation interface of the acquisition software adopts a graphical user interface design, fully considering the operation habits of agricultural machine operators, which is simple and easy to understand. The acquisition software has a function of corresponding data and channel settings. After the initial installation or replacement of sensors, users can easily bind sensor data to the corresponding acquisition channels through drag-and-drop operations; the virtual channel setting function allows users to synthesize or calculate the data of multiple related sensors to create new virtual data channels. For example, the torque and rotational speed data are used to calculate the real-time power through a built-in formula, and a new power virtual channel is added to display on the interface; the display data setting function enables users to customize the data items, layout, and color style displayed on the interface to meet the personalized needs of different users. In actual farm operations, when the agricultural machine operator starts the tractor, the telemeter immediately starts working. The sensor module collects various load data in real time, which is aggregated and preprocessed by the data collector and then wirelessly transmitted to the host. The acquisition software on the host quickly performs in-depth processing, analysis, and visual display of the data. The agricultural machine operator monitors the operation status of the agricultural machine in real time through the operation interface throughout the process. Once an anomaly occurs, timely adjustment measures are taken to ensure the efficient and stable operation of the agricultural machine, greatly improving the refined management level of farm operations. Through the above detailed design and implementation, the low-power telemeter for agricultural machine field operation loads of the present invention demonstrates excellent performance in complex and changeable farm environments, providing strong technical support for the intelligent development of modern agriculture.

[0046] The specific use of this telemeter is as follows: For example, during the spring plowing and sowing process, a tractor pulls a seeder and shuttles through the fields. At this time, the upper drawbar sensor in the suspended implement sensor accurately measures the force on the upper drawbar to ensure the stable suspension height of the seeder, and the angle sensor provides real-time feedback on the angle of the upper drawbar to ensure uniform sowing depth. The lower suspension pin sensor accurately measures the towing resistance of the seeder, enabling the tractor to adjust the power output in a timely manner according to the resistance to avoid power waste or insufficiency. The rotational power measurement sensor closely monitors the torque and rotational speed of the power output shaft to ensure efficient power transmission and the normal operation of the seeder. The trailed implement sensor provides supplementary information for assisting in monitoring the force on the rear of the seeder.

[0047] The data collector quickly converts and organizes these sensor signals and transmits them to the host via wireless communication. The acquisition software on the host displays various types of data in real time. By observing the load curve, the operator discovers that the towing resistance of the seeder suddenly increases in a certain field. After inspection, it is found that this is caused by high soil humidity and heavy soil texture. Therefore, based on the analysis results of the software, the operator adjusts the driving speed of the tractor and reduces the working depth of the seeder, enabling the sowing operation to resume smoothly. Throughout the process, the low-power design of the telemeter ensures that long-term continuous operation does not require frequent battery replacement, providing a strong guarantee for the efficient completion of spring plowing operations.

[0048] Through the above detailed description of Embodiment 1, the advantages of the low-power telemeter for agricultural machinery field operation load in terms of technical implementation, functional application, etc. are fully demonstrated, providing a reliable solution for the monitoring and operation optimization of agricultural machinery in modern agricultural production.

[0049] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0050] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not elaborate on all the details, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. The present specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A low-power telemeter for agricultural machinery field operation load, characterized in that, Including: A sensor module, including a suspended implement sensor, a rotational power measurement sensor, and a trailed implement sensor, for measuring various load parameters during agricultural machinery field operations; A data collector, integrating analog signal channels, torque / speed synthesis channels, rotational speed signal channels, and angle signal channels, for collecting signals from the above sensor module; A host computer and acquisition software. The host computer is wirelessly connected to the data collector, and the acquired data is processed and analyzed through the acquisition software.

2. The low-power telemeter for agricultural machinery field operation load according to claim 1, wherein The suspended implement sensor includes: At least one upper link sensor, for measuring the tensile or compressive force on the upper link and its relative angle with the ground; At least two lower hitch pin sensors, respectively installed at the traction points of the left and right lower hitch bars of the tractor, for measuring the traction resistance of the implement.

3. The low-power telemeter for agricultural machinery field operation load according to claim 2, characterized in that, The upper link sensor includes a tensile / compressive force sensor and an angle sensor, and the tensile / compressive force signal interface and the angle signal interface are connected to the corresponding channel interfaces of the data collector through communication cables.

4. The low-power telemeter for agricultural machinery field operation load according to claim 2, wherein The lower hitch pin sensor is a shear force sensor that is symmetric left and right. The tensile / compressive force signal interfaces on its left and right sides are connected to the corresponding channel interfaces of the data collector through communication cables.

5. The low-power telemeter for agricultural machinery field operation load according to claim 1, characterized in that, The rotational power measurement sensor adopts an extended output shaft structure, simultaneously testing the dynamic torque and rotational speed of the output shaft. It is installed between the power take-off shaft of the tractor and the agricultural machinery to be measured, and the torque / rotational speed signal interface is connected to the corresponding channel interface of the data collector through a communication cable.

6. The low-power telemeter for agricultural machinery field operation load according to claim 1, characterized in that The trailed implement sensor includes a shear force sensor and an angle sensor. The shear force sensor is symmetrically installed on the left and right lower hitch pins of the drawbar, and the tensile / compressive force signal interfaces on its left and right sides are connected to the corresponding channel interfaces of the data collector through communication cables.

7. The low-power telemeter for agricultural machinery field operation load according to claim 1, characterized in that, The data collector is equipped with an antenna for wireless data transmission, powered by a lithium-ion battery or a lithium polymer battery. The battery compartment has a pull-out or snap-on structure, and is provided with a standard charger interface and a vehicle charger interface.

8. The low-power telemeter for agricultural machinery field operation load according to claim 1, characterized in that, The acquisition software has the following functions: real-time data display and visualization, data curve plotting and analysis, data calibration and calibration, data display range and sampling frequency setting, data anomaly detection and alarm, data storage and management, user permission management and operation log recording.

9. The low-power telemeter for agricultural machinery field operation load according to claim 8, characterized in that, The operation interface of the acquisition software adopts a graphical user interface design. The acquisition software has functions such as data and channel corresponding setting, virtual channel setting, and display data setting.

10. The low-power telemeter for agricultural machinery field operation load according to claim 9, characterized in that, The data calibration and calibration function of the acquisition software allows users to perform personalized calibration operations for sensors of different models and different accuracy levels, and has a data calibration compensation function. It can perform real-time calibration compensation on the data collected by the sensors according to a preset calibration period or a calibration instruction manually triggered by the user.

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