Livestock weight detection system and method

Abstract

The present invention relates to the field of livestock breeding information technology, and provides a livestock weight detection system and method. The livestock weight detection system includes a weighing platform, a radio frequency card, a radio frequency card reader and a plurality of piezoelectric film sensors. The radio frequency card reader is arranged at the entrance of the weighing platform and is used to read the radio frequency card set on the object to be measured. The plurality of piezoelectric film sensors are arranged in the weighing platform to obtain the weight of the object to be measured. The detection method includes the following steps: Step 1, the object to be measured enters the weighing platform from the entrance of the weighing platform, and the radio frequency card reader reads the radio frequency card set on the object to be measured to obtain the number information of the object to be measured; Step 2, the object to be measured moves on the weighing platform, and a plurality of piezoelectric film sensors detect the weight of the object to be measured. The embodiment of the present invention improves the degree of automation and simplifies the operating procedures; effectively improves the accuracy of weight measurement, and ensures the authenticity of the weight measurement value of the object to be measured in each moving state.

Description

Technical Field

[0001] The present invention relates to the field of livestock breeding information technology, and in particular to a livestock weight detection system and method. Background Art

[0002] At present, the development level of automation in dairy cattle breeding management in my country is not as high as that in large-scale dairy farms abroad. There is little research on dynamic detection devices for dairy cow weight. Weighing dairy cows is complicated and costly for manual operation, and it is not conducive to applying dairy cow weight data to the scientific feeding management plan for each individual cow.

[0003] The automated dairy cow weighing equipment developed in China focuses on collecting the static weight of dairy cows, using rails, restraining racks, feed troughs, etc. to keep the cows and the weighing equipment relatively still. There is no mature technology for true dynamic weighing, and there is no standardized product that can conveniently serve the scientific management plan for dairy cow feeding. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a livestock weight detection system to solve the problem that the existing weighing operation of dairy cows is complicated and the weight cannot be automatically matched with the corresponding individual management of dairy cows.

[0005] The invention also provides a livestock weight detection method.

[0006] According to the first aspect of the present invention, a livestock weight detection system includes a weighing platform, a radio frequency card, a radio frequency card reader and a plurality of piezoelectric film sensors. The radio frequency card reader is arranged at the entrance of the weighing platform and is used to read the radio frequency card set on the object to be measured. The plurality of piezoelectric film sensors are arranged in the weighing platform to obtain the weight of the object to be measured.

[0007] According to one embodiment of the present invention, a guardrail is provided on the peripheral side of the weighing platform, a first opening is provided at a position of the guardrail corresponding to the entrance of the weighing platform, and a second opening is provided at a position of the guardrail corresponding to the exit of the weighing platform.

[0008] According to one embodiment of the present invention, a first pair of infrared sensors is provided on the guardrails on both sides of the first opening, a second pair of infrared sensors is provided on the guardrails on both sides of the second opening, and at least one third pair of infrared sensors is provided on the guardrails on both sides between the first opening and the second opening.

[0009] According to one embodiment of the present invention, it further includes a signal processor, which is electrically connected to the radio frequency card reader, the piezoelectric film sensor, the first pair of infrared sensors, the second pair of infrared sensors and the third pair of infrared sensors respectively.

[0010] According to one embodiment of the present invention, it further includes a lower-level single-chip microcomputer, and the lower-level single-chip microcomputer is electrically connected to the signal processor.

[0011] According to one embodiment of the present invention, it further includes a host computer and a display screen, wherein the host computer is electrically connected to the lower single-chip computer, and the display screen is electrically connected to the host computer.

[0012] According to an embodiment of the present invention, a receiving groove corresponding to each of the piezoelectric film sensors is provided in the weighing platform, and the piezoelectric film sensor is arranged at the bottom of the receiving groove.

[0013] According to an embodiment of the present invention, a potting glue is provided between the upper side of the piezoelectric film sensor and the weighing platform.

[0014] A livestock weight detection method according to a second aspect of the present invention comprises the following steps:

[0015] Step 1: The object to be tested enters the weighing platform through the entrance of the weighing platform, and the radio frequency card reader reads the radio frequency card set on the object to be tested to obtain the serial number information of the object to be tested;

[0016] Step 2: The object to be measured moves on the weighing platform, and a plurality of piezoelectric film sensors detect the weight of the object to be measured.

[0017] According to an embodiment of the present invention, the present invention further includes step three, the plurality of piezoelectric film sensors transmit electrical signals to a signal processor, and the signal processor performs parallel connection, filtering and amplification processing on the electrical signals;

[0018] The signal processor transmits the processed electrical signal to the lower-level single-chip microcomputer, and the lower-level single-chip microcomputer converts the electrical signal into weight data after processing it through a preset program.

[0019] The embodiments of the present invention provide a livestock weight detection system and method, which realize the automatic collection of the weight of the object to be measured during its movement. Through the cooperation of a radio frequency card and a radio frequency card reader, the corresponding management of the weight and the information of the object to be measured is achieved, the degree of automation is improved, and the operation procedure is simplified. Multiple piezoelectric film sensors effectively improve the accuracy of weight measurement and ensure the authenticity of the weight measurement value of the object to be measured in various moving states.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a structural schematic diagram of a livestock weight detection system according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the assembly of a piezoelectric film sensor of a livestock weight detection system according to an embodiment of the present invention;

[0024] Figure 3 The working process of the signal processor of the livestock weight detection method according to the embodiment of the present invention;

[0025] Figure 4 This is a flow chart of the working procedure of the livestock weight detection method according to an embodiment of the present invention;

[0026] Figure 5 This is a data flow diagram of the livestock weight detection method according to an embodiment of the present invention.

[0027] Reference numerals:

[0028] 1: weighing platform; 2: radio frequency card reader; 3: the first pair of infrared sensors; 4: piezoelectric film sensor; 5: the second pair of infrared sensors; 6: the third pair of infrared sensors; 7: the first opening; 8: the second opening; 9: baffle; 10: guardrail; 11: signal processor; 12: lower microcontroller; 13: upper computer; 14: receiving groove; 15: potting glue. DETAILED DESCRIPTION

[0029] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0032] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0034] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a livestock weight detection system, including a weighing platform 1, a radio frequency card, a radio frequency card reader 2 and a plurality of piezoelectric film sensors 4, the radio frequency card reader 2 is arranged at the entrance of the weighing platform 1, and is used to read the radio frequency card set on the object to be measured, and the plurality of piezoelectric film sensors 4 are arranged in the weighing platform 1 to obtain the weight of the object to be measured. It can be understood that in this embodiment, the weighing platform 1 is a rectangular structure with a length of 3m and a width of 0.7m. The left end side of the weighing platform 1 is the entrance, and the right end side is the exit. The object to be measured in this embodiment takes a cow as an example, but is not limited to a cow.

[0035] Specifically, the radio frequency card is a H4001 medium-range electronic radio frequency card, and the radio frequency card reader 2 uses PR600, with an operating current of less than 300mA and an operating temperature of -20 to 55°C. The radio frequency card is a cow ear tag composed of a female port and a male buckle. The female buckle and the male buckle are made of strong resin material. The female buckle is equipped with an electronic radio frequency card chip. The ear tag is directly buckled on the cow's ear with ear nail pliers. The radio frequency card reader 2 reads the information in the cow ear tag electronic radio frequency card when the cow enters the weighing platform 1.

[0036] Furthermore, in this embodiment, a total of 5 piezoelectric film sensors 4 are provided, and are evenly arranged in the weighing platform 1 along the length direction of the weighing platform 1. When the cow walks on the weighing platform 1, the weight of the cow in motion is detected. The piezoelectric film sensor 4 uses polyvinylidene fluoride as a piezoelectric material. When the piezoelectric material is deformed under the action of an external force, polarization is generated inside, and equal amounts of oppositely charged charges will gather on the two end faces in the polarization direction, forming a positive piezoelectric effect phenomenon. The piezoelectric film sensor 4 generates a piezoelectric signal based on the positive piezoelectric effect of polyvinylidene fluoride, and then realizes weight measurement according to the weighing calculation formula.

[0037] According to one embodiment of the present invention, a guardrail 10 is provided on the surrounding side of the weighing platform 1, and a first opening 7 is provided at the guardrail 10 corresponding to the entrance of the weighing platform 1, and a second opening 8 is provided at the guardrail 10 corresponding to the exit of the weighing platform 1. In this embodiment, the weighing platform 1 is provided with guardrails 10 on both sides along its length direction. The left end of the guardrail 10 is provided with a first opening 7 corresponding to the entrance of the weighing platform 1, which is convenient for cows to enter; the right end of the guardrail 10 is provided with a second opening 8 corresponding to the exit of the weighing platform 1, which is convenient for cows that have completed the weight measurement to walk out of the weighing platform 1. It can be understood that the guardrails 10 on both sides play a role in restricting the walking direction of the cows. In this embodiment, the height of the guardrails 10 on both sides is 1m, which can be specifically set according to the height of the cows.

[0038] In one example, a detachable baffle plate 9 is provided at the left end of the guardrail 10 to prevent other cows from entering the weighing platform 1 by themselves and affecting the accuracy of the test results of the cow being tested.

[0039] According to one embodiment of the present invention, a first pair of infrared sensors 3 is provided on the guardrails 10 on both sides of the first opening 7, a second pair of infrared sensors 5 is provided on the guardrails 10 on both sides of the second opening 8, and at least one third pair of infrared sensors 6 is provided on the guardrails 10 on both sides between the first opening 7 and the second opening 8. It can be understood that in this embodiment, a total of 12 infrared sensors are provided, all of which are normally open type opposing infrared sensors with long sensing distance and not easily interfered with. Among them, the first pair of infrared sensors 3 is provided as a pair, including two infrared sensors arranged oppositely, and are arranged at the entrance of the weighing platform 1. When the cows start to enter, the infrared beams emitted by the two infrared sensors in the first pair of infrared sensors 3 are blocked, and the infrared sensor switches are connected; the second pair of infrared sensors 3 is provided as a pair, including two infrared sensors arranged oppositely, and are arranged at the exit of the weighing platform 1. When the cows start to enter, the infrared beams emitted by the two infrared sensors in the first pair of infrared sensors 3 are blocked, and the infrared sensor switches are connected; the second pair of infrared sensors 3 is provided as a pair, including two infrared sensors arranged oppositely, and are arranged at the exit of the weighing platform 1. When the cow starts to walk down the weighing platform 1, the infrared beam of the second pair of infrared sensors 3 is blocked. When the cow walks out of the weighing platform 1 as a whole, the second pair of infrared sensors 3 resumes the beam, and the weighing process ends at this time. The next weighing process starts when the first pair of infrared sensors 3 at the entrance of the weighing platform 1 senses the passage of the next cow. The third pair of infrared sensors 6 are arranged in four pairs, and each pair of the third pair of infrared sensors 6 includes two infrared sensors arranged oppositely. The four pairs of third pairs of infrared sensors 6 are arranged on the guardrail 10 at equal intervals along the length direction of the weighing platform 1 to accurately identify the position of the cow.

[0040] It is worth noting that the installation height of the infrared sensor needs to be compatible with the height of the cow's body to ensure that the relatively installed infrared sensor can be blocked by the cow's body during the cow's movement.

[0041] According to one embodiment of the present invention, a signal processor 11 is also included. The signal processor 11 is electrically connected to the radio frequency card reader 2, the piezoelectric film sensor 4, the first pair of infrared sensors 3, the second pair of infrared sensors 5 and the third pair of infrared sensors 6. It can be understood that the signal processor 11 includes a digital junction box, an A / D converter, an amplifying sensor and a wireless transmission module. The digital junction box is used for signal integration of the five piezoelectric film sensors 4, and a bridge power supply shared by the five piezoelectric film sensors 4 is placed. The five piezoelectric film sensors 4 are used in parallel; the amplifying sensor uses an OP07 chip low-noise non-chopper-stabilized bipolar operational amplifier integrated circuit. The analog electrical signal converted by the piezoelectric film sensor 4 is amplified and then enters the A / D converter for analog-to-digital conversion. The wireless transmission module uses the SX1212 wireless transmission module. The transmission distance of the module is about 1500m, and the transmission frequency used is 433MHz. At the same time, the module also has the performance of small size and ultra-low power consumption. Its transmission current is 84mA and the sleep current is 0.3μA. The wireless transmission module contains RF and logic function control circuits. At the same time, the SX1212 contains an integrated voltage-controlled oscillator, phase-locked loop circuit, power amplifier circuit, low-noise amplifier circuit, modulation and demodulation circuit, inverter, intermediate frequency amplifier circuit, etc. The highly integrated architecture allows a minimum number of external components while maintaining design flexibility.

[0042] According to one embodiment of the present invention, it also includes a lower single-chip microcomputer 12, which is electrically connected to the signal processor 11. In this embodiment, the lower single-chip microcomputer 12 uses an STM32 series single-chip microcomputer, with a maximum operating frequency of 72MHz, an integrated 32-512KB Flash memory on the chip, supports peripherals such as timers, ADC, DAC, SPI, IIC, and UART, 3 12-bit 16-channel A / D converters, and a measurement range of 0-3.6V. There are 2 16-bit basic timers inside for driving DAC. The STM32 microcontroller has an embedded ARM core that is compatible with all ARM tools and software, and performs algorithmic processing on the voltage signal to obtain the cow weight data. The signal processor 11 receives the analog electrical signal, and transmits it to the lower single-chip microcomputer 12 after parallel connection, filtering, and amplification processing; the lower single-chip microcomputer 12 converts the collected voltage data into weight data through a predetermined program of a cow weight dynamic detection method matched with the system.

[0043] According to one embodiment of the present invention, it also includes a host computer 13 and a display screen, the host computer 13 is electrically connected to the lower single-chip computer 12, and the display screen is electrically connected to the host computer 13. It can be understood that the lower single-chip computer 12 transmits to the host computer 13 and the display screen through the wireless communication module of the signal processor 11. The host computer 13 is located in the breeder and the administrator's office, and can save and analyze the collected data. The display screen receives and displays the cow weight information through the wireless communication module. The display screen adopts a 7-inch USART serial port TFT liquid crystal display module, which has strong operability. The self-designed interface can be downloaded to the module for display. It is matched with a matrix keyboard to form the display and operation part of the system to realize the real-time display of data information. The staff can perform subsequent operations on the saved cow weight data on the host computer 13.

[0044] It is worth mentioning that the communication between all units in the system is carried out through the 485 bus system for data transmission. The RS485 bus adopts half-duplex working mode, supports multi-point data transmission, and realizes communication by balanced sending and differential receiving. The data sending end converts the TTL level signal of the serial port into differential signals a and b and outputs them in two ways. The twisted pair is used as the transmission line to send data. After being sent through the cable, the differential signal is restored to a TTL level signal at the receiving end. The communication line adopts the master-slave multi-machine communication mode. The standard serial interface of the upper computer 13 converts the RS-232 level into the RS-485 standard level through the RS232 / 485 conversion circuit to communicate with the lower microcontroller 12.

[0045] According to one embodiment of the present invention, a receiving groove 14 corresponding to the piezoelectric film sensor 4 is provided in the weighing platform 1, and the piezoelectric film sensor 4 is provided at the bottom of the receiving groove 14. It can be understood that the receiving groove 14 is provided in the weighing platform 1, and the piezoelectric film sensor 4 is horizontally placed in the receiving groove 14. In this embodiment, the receiving groove 14 is made of metal and has a depth of 4 mm.

[0046] According to one embodiment of the present invention, a potting glue 15 is provided between the upper side of the piezoelectric film sensor 4 and the weighing platform 1. It can be understood that the potting glue 15 is provided on the upper side of the piezoelectric film sensor 4 to prevent the piezoelectric film sensor 4 from sliding due to uneven force, and to prevent the piezoelectric film sensor 4 from directly contacting the table, thereby reducing the influence of humidity and improving the stability of the weighing result. In this embodiment, the potting glue 15 is formed by mixing epoxy resin glue, quartz sand, and coagulant in a certain proportion.

[0047] like Figures 3 to 5 As shown, the embodiment of the present invention also provides a livestock weight detection method, comprising the following steps:

[0048] Step 1: The object to be tested enters the weighing platform through the entrance of the weighing platform, and the radio frequency card reader reads the radio frequency card set on the object to be tested to obtain the serial number information of the object to be tested;

[0049] Step 2: The object to be measured moves on the weighing platform, and a plurality of piezoelectric film sensors detect the weight of the object to be measured.

[0050] According to an embodiment of the present invention, the present invention further includes step three, the plurality of piezoelectric film sensors transmit electrical signals to a signal processor, and the signal processor performs parallel connection, filtering and amplification processing on the electrical signals;

[0051] The signal processor transmits the processed electrical signal to the lower-level single-chip microcomputer, and the lower-level single-chip microcomputer converts the electrical signal into weight data after processing it through a preset program.

[0052] The livestock weight detection method according to the embodiment of the present invention specifically comprises the following steps:

[0053] 1. Identify cow identity information

[0054] When the cow enters the weighing platform through the first opening, the radio frequency card reader reads the information of the radio frequency card, detects the cow's number, and transmits the cow's number to the lower microcontroller through the signal processor;

[0055] 2. Detect cow position

[0056] When the cow starts to enter the weighing platform, the infrared beam of the first pair of infrared sensors is blocked, the infrared switch is connected, and the data acquisition system starts to collect data; when the cow completely walks onto the weighing platform, the infrared beam of the first pair of infrared sensors is not blocked, and voltage signal data is collected, and the third pair of infrared sensors collect the position of the cow in real time; when the cow walks off the weighing platform, the infrared beam of the second pair of infrared sensors is blocked and then resumes the beam, and data collection ends at this time, and the wireless transmission module sends the collected data to the lower microcontroller for processing;

[0057] 3. Weight information collection, processing and calculation

[0058] When collecting real-time data of cows entering the weighing platform, a high-speed sampling design is used based on the minimum distance between the front and rear limbs of the cows. Furthermore, when the cows are moving on the weighing platform, the unstable motion state of the area where the dynamic weighing piezoelectric film sensor is buried and the slight vibration of the weighing platform during the movement will generate certain interference signals. These interference signals will also be collected by the weighing sensor to form noise signals, affecting the acquisition of actual weighing signals. These noise signals are non-stationary, nonlinear, and have many singular points. Therefore, the wavelet transform and Kalman filter method are used to perform denoising and filtering on the collected weighing signals. When the cow steps on the piezoelectric film sensor, the pressure applied by the limbs is proportional to the collected voltage signal. The pressure applied to the piezoelectric film gradually increases, and the collected voltage signal gradually increases from zero and reaches a peak value. When the cow begins to step out of the weighing platform, as the applied pressure gradually decreases, the collected voltage signal also begins to decay from the peak value, and finally stabilizes and tends to zero. When the width of the piezoelectric film is constant, the width of the waveform is about 16ms to 22ms. As the cow's movement speed increases, the width of the waveform narrows linearly. Therefore, the integral area of ​​the voltage signal fitting curve is also linearly related to the speed. The area integration method is used to calculate the cow's weight. The voltage signal fitting curve obtained when the cow passes by is integrated and then multiplied by the movement speed to calculate the cow's weight.

[0059] (I) For the electrical signal of the piezoelectric film sensor received by the lower-level single-chip computer, a denoising method is first applied to correct it, removing the noise signal while effectively retaining the characteristic points of the original signal, and then calculating the optimal estimated value of the measurement data. The method is as follows:

[0060] Selecting appropriate db4 wavelet basis function to decompose the weighing signal, and performing five-layer decomposition on the weighing signal is more conducive to filtering out noise signals, and decomposing the weighing signal into:

[0061] S=cA1+cD1=cA5+cD5+cD4+cD3+cD2+cD1

[0062] Among them, cA i is the approximate part of the decomposition, cD i For the decomposed details;

[0063] (ii) Decomposing the five details of the wavelet basis function cD i Kalman filtering is performed separately, such as Figure 5 As shown, the Kalman filter state update equation is as follows:

[0064] X k =EX k-1 +BU k-1 (1)

[0065] Pk =EP k-1 E T +Q (2)

[0066] Where: X k is the state of the system at time k; E is the state transfer matrix; B is the input control matrix; U is the effect of the outside world on the system; P k is the error matrix; Q is the prediction noise covariance matrix;

[0067] Formula (1) is the state prediction equation, which recursively infers X through the state at time k-1 k-1 , estimate the state X at the kth moment k ; Formula (2) is the error matrix prediction, using the covariance P at time k-1 k-1 Recursively obtain the covariance estimate P at the kth moment k ;

[0068] K k =P k H T (HP k H T +R) -1 (3)

[0069] X k =X k +K k (Z k -HX k ) (4)

[0070] P k =(IK k H)P k (5)

[0071] Where: K k is the Kalman gain, H is the observation matrix, R is the measurement noise covariance matrix, Z k is the observed value at time k;

[0072] Formula (3) is the Kalman gain calculation, Formula (4) is the state correction, and its output is the final Kalman filter result, and Formula (5) is the covariance matrix update;

[0073] (III) Reconstruct the five decomposition detail coefficients calculated by Kalman filtering to obtain the weighing signal processed and reconstructed by Kalman filtering. The corresponding reconstruction formula is:

[0074]

[0075] Among them, l j,k is the scale factor, d j,kis the wavelet coefficient, h and g are a pair of orthogonal mirror filter banks, j is the number of decomposition layers, and the value k=0, 1, 2, 3, 4 is taken according to the number of discrete point sampling.

[0076] (IV) When each pair of infrared sensor beams is blocked, a signal is transmitted to the signal processor, which is then processed and transmitted to the lower microcontroller for calculation. The time when the i-th pair of infrared sensors is blocked is t i,1 , after the cow has completely passed through a pair of infrared sensors, the transmitted signal is recorded as t i,2 , according to the platform length and time stamp, call the program in the microcontroller and use the formula v i =0.6m / (t i+1,1 -t i,1 ) Calculate the movement speed of the cow in each block on the weighing platform;

[0077] (V) The lower-level single-chip computer runs the weight calculation program, combines the optimal estimated value of the electrical signal obtained by denoising in (I) to (III) and the cow's movement speed calculated in (IV), and uses the empirical formula to obtain the weighing calculation for each piezoelectric film sensor on the weighing platform:

[0078] W i =γZV

[0079] Where: W i is the measured weight, γ is the weighing coefficient, Z is the waveform area of ​​the piezoelectric signal, and V is the velocity. The calculation formula of Z is:

[0080]

[0081] (VI) The total time that the cows travel through the weighing platform is divided into three types of movement, as follows:

[0082] (1) Less than 3 seconds: high-speed movement;

[0083] (2) 2 to 10 seconds: medium to low speed movement;

[0084] (3) greater than 10 seconds: slow movement;

[0085] According to the different movement conditions of the cows and the elapsed time, different formulas are used in the lower microcontroller program to preliminarily calculate the weight data. The calculation formula is as follows:

[0086]

[0087] Among them, when the total time the cow passes through the weighing platform is less than 10 seconds, the cow moves faster, and when it is less than 3 seconds, the movement is more violent. Parameters are introduced to improve the calculation accuracy.

[0088] 4. Transmit information to the host computer and display screen

[0089] In order to meet the display of real-time information on the weight of dairy cows and to cooperate with the display of other ranch management software information, the TFT-LCD, a thin film transistor liquid crystal display, which is more popular at this stage, is selected. A thin film transistor (TFT) is set on each pixel of the LCD screen, which can effectively overcome the crosstalk when it is not selected, so that the static characteristics of the display LCD screen are independent of the number of scan lines, improve the image quality, and can display the RFID and weight information of the weighed dairy cows in real time. A wireless receiving module and an active converter matched with it are installed at the receiving end of the host computer. The active converter transmits the data information received by the wireless receiving end to the host PC. After that, the breeder and manager can analyze and apply the collected and processed dairy cow weight information in the host computer system.

[0090] The embodiments of the present invention provide a livestock weight detection system and method, which realize the automatic collection of the weight of the object to be measured during its movement. Through the cooperation of a radio frequency card and a radio frequency card reader, the corresponding management of the weight and the information of the object to be measured is achieved, the degree of automation is improved, and the operation procedure is simplified. Multiple piezoelectric film sensors effectively improve the accuracy of weight measurement and ensure the authenticity of the weight measurement value of the object to be measured in various moving states.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0092] The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A livestock weight detection system, characterized in that: The invention comprises a weighing platform, a radio frequency card, a radio frequency card reader and a plurality of piezoelectric film sensors. The radio frequency card reader is arranged at the entrance of the weighing platform and is used to read the radio frequency card arranged on the object to be measured. The plurality of piezoelectric film sensors are arranged in the weighing platform and are used to obtain the weight of the object to be measured. Wherein, guardrails are arranged around the weighing platform, a first opening is arranged at a position corresponding to the entrance of the weighing platform, a second opening is arranged at a position corresponding to the exit of the weighing platform, a first pair of infrared sensors are arranged on the guardrails on both sides of the first opening, a second pair of infrared sensors are arranged on the guardrails on both sides of the second opening, and at least one third pair of infrared sensors are arranged on the guardrails on both sides between the first opening and the second opening. The livestock weight detection system further includes a signal processor and a lower single chip microcomputer. The processor is electrically connected to the radio frequency card reader, the piezoelectric film sensor, the first pair of infrared sensors, the second pair of infrared sensors and the third pair of infrared sensors respectively. The lower single chip microcomputer is electrically connected to the signal processor. Among them, the first pair of infrared sensors, the second pair of sensors and the at least one third pair of infrared sensors collect livestock movement data, the signal processor performs denoising and filtering on the weighing electrical signals obtained by the multiple piezoelectric film sensors, and the lower-level single-chip computer calculates the preliminary weight and movement speed of the livestock based on the denoising and filtered data and the movement data, and calculates the final weight based on the preliminary weight and the movement speed.

2. The livestock weight detection system according to claim 1, characterized in that: It also includes a host computer and a display screen, wherein the host computer is electrically connected to the lower single-chip computer, and the display screen is electrically connected to the host computer.

3. The livestock weight detection system according to claim 1, characterized in that: The weighing platform is provided with accommodating grooves corresponding to the piezoelectric film sensors one by one, and the piezoelectric film sensors are arranged at the bottom of the accommodating grooves.

4. The livestock weight detection system according to claim 3, characterized in that: A potting glue is provided between the upper side of the piezoelectric film sensor and the weighing platform.

5. A detection method of a livestock weight detection system according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: The object to be tested enters the weighing platform through the entrance of the weighing platform, and the radio frequency card reader reads the radio frequency card set on the object to be tested to obtain the serial number information of the object to be tested; Step 2: The object to be measured moves on the weighing platform, and a plurality of piezoelectric film sensors detect the weight of the object to be measured.

6. The detection method according to claim 5, characterized in that: The invention also includes step 3, wherein the plurality of piezoelectric film sensors transmit electrical signals to a signal processor, and the signal processor performs parallel connection, filtering and amplification processing on the electrical signals; The signal processor transmits the processed electrical signal to the lower-level single-chip microcomputer, and the lower-level single-chip microcomputer converts the electrical signal into weight data after processing it through a preset program.

Images