A harmless treatment device for waste in pig slaughtering

Abstract

The application discloses a kind of pig slaughtering waste harmless treatment equipment, including crusher, preparation tank, conveying channel, weighing unit and controller, further include: near infrared spectroscopy detection unit, machine vision detection unit, vibration material uniform device, partition steam injection module, multi-zone temperature detection module, the controller includes feedforward control unit and feedback control unit, the feedforward control unit is according to the detection data of near infrared spectroscopy detection unit, machine vision detection unit and weighing unit, the initial opening of each proportional regulating valve is calculated by feedforward model;The feedback control unit is according to the temperature data of multi-zone temperature detection module, and the correction opening of each proportional regulating valve is calculated by PID control algorithm and temperature gradient collaborative control algorithm, so that steam injection parameters and material actual component match, effectively solve the problem that high grease material localizes and slowly warms up to high moisture material.

Description

Technical Field

[0001] This invention relates to the field of slaughtering equipment technology, specifically to a device for the harmless treatment of waste from pig slaughtering. Background Technology

[0002] The slaughtering of pigs generates a large amount of waste, including unqualified pigs, lymph nodes, meat scraps, blood, and internal organs. According to the "Technical Specifications for Harmless Treatment of Dead and Diseased Animals", such waste must be treated to kill pathogens before it can be discharged or utilized as a resource.

[0003] High-temperature and high-pressure humidification treatment (also known as the rendering method) is currently the mainstream harmless treatment technology. Its principle is to place the waste in a sealed rendering tank and introduce high-temperature and high-pressure saturated steam (temperature ≥135℃, pressure ≥0.3MPa) to denature the proteins and melt the oils in the waste, while completely killing pathogens, and finally separating industrial oils and meat and bone meal.

[0004] The existing steam injection systems for chemical treatment tanks generally suffer from the following technical problems:

[0005] First, the fixed steam injection parameters cannot adapt to the differences in material composition: different batches of slaughter waste vary significantly in terms of oil content, moisture content, and degree of fragmentation (oil content 5%-35%, moisture content 40%-80%). However, the existing equipment uses uniform steam injection parameters, which leads to local overheating and coking of high-oil materials and slow heating and increased energy consumption of high-moisture materials.

[0006] Secondly, the temperature distribution inside the tank is uneven, creating sterilization dead zones: Existing chemical treatment tanks typically only have a single or a few steam nozzles. Steam preferentially heats the area directly in front of the nozzle, while areas far from the nozzle experience delayed heating. Even when using a ring-shaped steam injection mechanism (such as an energy-saving wet chemical treatment machine and its working method with application number CN114433607B), it is still an open-loop passive distribution, lacking real-time monitoring and active adjustment capabilities for the temperature field. This results in temperature differences of 10-20℃ between different areas inside the tank, affecting sterilization uniformity.

[0007] Therefore, a harmless treatment device for waste generated during pig slaughter is proposed. Summary of the Invention

[0008] The purpose of this invention is to provide a device for the harmless treatment of waste from pig slaughtering, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a device for the harmless treatment of waste from pig slaughtering, comprising a crusher, a rendering tank, a conveying channel, a weighing unit, and a controller, and further comprising:

[0010] The near-infrared spectroscopy detection unit is installed above the conveying channel to detect the oil content and moisture content of the crushed waste.

[0011] The machine vision inspection unit is installed above the conveyor channel to detect the particle size distribution of the crushed waste.

[0012] A vibrating material leveling device is installed inside the conveying channel to level the material.

[0013] The zoned steam injection module is located inside the chemical treatment tank and includes multiple nozzles distributed along the axial and radial directions of the chemical treatment tank, as well as proportional regulating valves that are independently controlled.

[0014] A multi-zone temperature detection module includes multiple temperature sensors installed in different zones within the chemical reaction tank to collect the temperature of each zone in real time.

[0015] The controller includes a feedforward control unit and a feedback control unit. The feedforward control unit calculates the initial opening of each proportional control valve based on the detection data from the near-infrared spectroscopy detection unit, the machine vision detection unit, and the weighing unit using a feedforward model. The feedback control unit calculates the corrected opening of each proportional control valve based on the temperature data from the multi-zone temperature detection module using a PID control algorithm and a temperature gradient collaborative control algorithm.

[0016] Preferably, the chemical treatment tank is divided into 1 region along its axial direction and 1 region along its radial direction, forming a total of 1 temperature monitoring zone; each temperature monitoring zone is equipped with a proportional regulating valve and a temperature sensor.

[0017] Preferably, the zoned steam injection module includes a main steam pipe and five rows of distribution ring pipes arranged along the axial direction of the chemical treatment tank. Each row of distribution ring pipes is provided with three branch pipe interfaces along the circumference, and each interface is connected to a proportional regulating valve and a nozzle. Among them, the nozzle corresponding to the central area adopts a wide-angle solid cone nozzle with an injection angle of 75°, the nozzle corresponding to the inner ring area adopts a medium-angle solid cone nozzle with an injection angle of 50°, and the nozzle corresponding to the near-wall area adopts a narrow-angle flat nozzle with an injection angle of 30°.

[0018] Preferably, the feedforward model adopts a quadratic response surface model, for the first... The initial opening of each proportional control valve The expression is as follows:

[0019] ;

[0020] in, For oil content, Moisture content, Particle size, The loading amount is used; the model parameters are obtained through central composite design experiments and least squares fitting and are pre-stored in the controller.

[0021] Preferably, the temperature gradient collaborative control algorithm is configured to calculate a collaborative correction amount when the temperature difference between adjacent regions exceeds a preset threshold. Adjust the opening degree of the corresponding proportional regulating valve to control the temperature difference within the specified range.

[0022] Preferably, the formula for calculating the collaborative correction amount is as follows:

[0023] ;

[0024] in, For the synergy coefficient, This represents the absolute value of the temperature difference between adjacent areas. This is the temperature difference threshold.

[0025] Preferably, the controller is configured to perform feedforward-feedback composite control during the heating phase, simultaneously perform PID control and temperature gradient collaborative control during the isothermal phase, and lock the integral term in the PID control and disable the temperature gradient collaborative control during the heat preservation phase.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. This invention uses a near-infrared spectroscopy detection unit and a machine vision detection unit to obtain the oil content, moisture content and particle size distribution of waste in real time. Combined with a feedforward model, it dynamically calculates the initial opening of the steam injection valves in each zone, so that the steam injection parameters match the actual composition of the material, effectively solving the problems of local coking of high oil materials and slow heating of high moisture materials.

[0028] 2. This invention employs a zoned steam injection module with independent temperature control in multiple axial and radial regions, combined with a multi-region temperature detection module and a temperature gradient collaborative control algorithm, to adjust the temperature difference between adjacent regions in real time (which can be controlled within 5℃), eliminate sterilization dead zones, significantly improve the temperature uniformity inside the tank, and ensure the sterilization qualification rate. Attached Figure Description

[0029] Figure 1 This is an overall structural view of the present invention;

[0030] Figure 2 This is a schematic diagram showing the present invention divided into 5 regions along the axial direction of the chemical preparation tank;

[0031] Figure 3 This is a schematic diagram showing the present invention divided into three regions along the radial direction of the chemical preparation tank;

[0032] Figure 4 This is an axial sectional view of the chemical preparation tank of the present invention;

[0033] Figure 5 This is a radial sectional view of the chemical preparation tank of the present invention;

[0034] Figure 6 This is a flowchart of the present invention.

[0035] In the picture:

[0036] 1. Crusher; 2. Chemical tank; 3. Conveying channel; 4. Detection mechanism; 41. Near-infrared spectroscopy detection unit; 42. Machine vision detection unit; 6. Vibrating material distribution device; 7. Weighing unit; 8. Zoned steam injection module; 81. Main steam pipe; 82. Distribution ring pipe; 83. Proportional regulating valve; 84. Nozzle. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1 to 5 This invention provides a technical solution for a waste harmless treatment device in pig slaughtering:

[0039] A harmless treatment device for pig slaughter waste includes a crusher 1 for crushing pig slaughter waste; a softening tank 2, located beside the crusher 1, for wetting the crushed pig slaughter waste; a conveying channel 3, located between the outlet of the crusher 1 and the inlet of the softening tank 2, for conveying the crushed pig slaughter waste into the softening tank 2; and a detection mechanism 4 installed above the conveying channel 3, comprising a near-infrared spectroscopy detection unit 41 and a machine vision detection unit 42. The near-infrared spectroscopy detection unit 41 includes three sets of fiber optic NIR probes and is used to detect oil in the crushed pig slaughter waste on the conveying channel 3. The machine vision inspection unit 42, which includes a high-speed industrial camera and an LED backlight, is used to detect the particle size distribution of the crushed pig slaughter waste. A vibration equalization device 6 is installed inside the conveying channel 3 to vibrate and flatten the crushed pig slaughter waste on the conveying channel 3, eliminating the interference of material accumulation on the detection data of the near-infrared spectroscopy detection unit 41 and the machine vision inspection unit 42. A weighing unit 7, installed on the bottom support of the rendering tank 2, is used to detect the amount of pig slaughter waste entering the rendering tank 2 in each batch. A dual-layer controller (not shown in the figure) is located on the outside of the rendering tank 2 and is used to process the collected information and output corresponding instructions.

[0040] As one embodiment of the present invention, such as Figure 1 As shown, the vibrating material distribution device 6 uses an electromagnetic vibrating feeder with a vibration frequency of 50Hz and an amplitude of 1.5mm. It spreads the crushed material into a single layer with a thickness of about 2.5cm to eliminate the interference of material accumulation on spectral measurement.

[0041] The near-infrared spectroscopy detection unit 41 includes three sets of fiber optic NIR probes (with wavelength range of 900-2500nm). The three sets of fiber optic NIR probes are arranged in a 120° ring above the conveying channel 3. Each fiber optic NIR probe is equipped with a halogen lamp light source and an InGaAs detector. The fiber optic NIR probe is 150mm away from the material surface, and the spectral acquisition integration time is 100ms. The near-infrared spectroscopy detection unit 41 is used to detect the oil content and water content of the material. Its detection principle is that water molecules have strong absorption peaks at 970nm, 1450nm, and 1940nm, and the CH bonds of oil have characteristic absorption peaks at 1200nm, 1400nm, and 1700nm. By analyzing the peak intensity of the reflection spectrum, the oil content and water content in the pig slaughter waste can be deduced.

[0042] The machine vision inspection unit 42 includes a high-speed industrial camera (1920×1200 resolution, 30fps frame rate) and an LED backlight, which is installed directly above the conveyor channel with a field of view of 200mm×150mm. The machine vision inspection unit 42 is used to detect the particle size distribution in the crushed pig slaughter waste to characterize the degree of crushing. It extracts the particle outline through an edge detection algorithm, counts the particle size distribution, and outputs the particle size parameters.

[0043] Weighing unit 7 uses four pressure-type weighing sensors (range 0-2t, accuracy ±0.5%) to detect the amount of pig slaughter waste entering the chemical treatment tank 2 in each batch.

[0044] The dual-layer controller uses a Siemens S7-1500 series PLC, equipped with analog input modules (16 channels, 16-bit resolution) and analog output modules (16 channels, 12-bit resolution). The PLC has a built-in PID function block with a sampling period of 1 second. It features a 12-inch touchscreen for parameter setting and monitoring and an industrial Ethernet module for communication with a host computer data server. The dual-layer controller includes a feedforward control unit and a feedback control unit. The feedforward control unit calculates and outputs the initial opening vector of each proportional control valve 83 based on the material composition characteristic parameters output by the feedforward detection module, using a built-in feedforward model. The feedback control unit calculates the temperature deviation of each zone and the temperature gradient between adjacent zones based on real-time temperature data collected by the multi-zone temperature detection module, and calculates the corrected opening vector of each proportional control valve 83 using a PID control algorithm and a temperature gradient coordinated control algorithm.

[0045] As one embodiment of the present invention, such as Figure 2 and Figure 3 As shown, the chemical treatment tank 2 is divided into 5 regions (A, B, C, D, E) along its axial direction and 3 regions (central region Z, inner ring region M, and near-wall region W) along its radial direction, for a total of 15 temperature monitoring regions. Each temperature monitoring region is equipped with a temperature sensor, which is a Pt100 armored thermocouple (accuracy ±0.2℃, protective tube material 316L stainless steel, outer diameter 6mm). The armored thermocouple is installed by welding a sealing sleeve through an opening in the outer wall of the chemical treatment tank 2 and fixing it with a compression nut. The signal line is led out to a signal conditioning module outside the chemical treatment tank 2 via a high-temperature resistant lead wire device for real-time acquisition of the specific temperature of the 15 temperature monitoring regions.

[0046] All openings are fitted with welded sealing sleeves and metal gaskets to ensure reliable sealing under high pressure conditions. Each temperature monitoring area is equipped with a sheathed thermocouple.

[0047] As one embodiment of the present invention, such as Figures 1 to 5As shown, the interior of the chemical treatment tank 2 is equipped with a zoned steam injection module 8, which includes a main steam pipe 81, a distribution ring pipe 82, a proportional regulating valve 83, and a nozzle 84.

[0048] Among them, the main steam pipe 81 is made of DN50 stainless steel pipe, which introduces 0.9MPa saturated steam from the boiler;

[0049] The distribution ring pipe 82 is arranged in five rows along the axial direction of the chemical preparation tank 2. The five rows of distribution ring pipe 82 are divided into five regions along the axial direction of the chemical preparation tank 2 (the five regions correspond to regions A, B, C, D and E of the chemical preparation tank 2 in the above embodiment, respectively). Each level of distribution ring pipe 82 is provided with three branch pipe interfaces along the circumference (the three branch pipe interfaces correspond to the central region Z, inner ring region M and near-wall region W of the chemical preparation tank 2, respectively), for a total of 15 interfaces.

[0050] There are 15 proportional control valves 83 in total. They are electric single-seat control valves, DN15, with equal percentage flow characteristics, input signal 4-20mA, response time ≤2s, and adjustment accuracy ±1.5%. Each temperature monitoring zone corresponds to one independent proportional control valve.

[0051] Nozzles 84 are located at the interface, totaling 15. The nozzles 84 corresponding to the central area Z are wide-angle solid cone nozzles with a spray angle of 75°, which can cover a wider area of ​​steam; the nozzles 84 corresponding to the inner ring area M are medium-angle solid cone nozzles with a spray angle of 50°; and the nozzles 84 corresponding to the near-wall area W are narrow-angle flat nozzles with a spray angle of 30°, which can prevent steam from being directly sprayed onto the tank wall of the chemical treatment tank 2, thus avoiding energy waste and thermal stress concentration.

[0052] It should be noted that the chemical treatment tank 2 is equipped with a stirring mechanism (not shown in the figure). The stirring blades of the stirring mechanism are staggered with the distribution ring pipe 82 to ensure that the stirring blades do not accidentally touch the distribution ring pipe 82 during stirring.

[0053] As one embodiment of the present invention, such as Figures 1 to 6 As shown, step one involves collecting the oil content of the crushed pig slaughter waste using the near-infrared spectroscopy detection unit 41. and moisture content The particle size of the crushed pig slaughter waste is collected by the machine vision inspection unit 42. The weighing unit 7 collects the amount of pig slaughter waste entering the treatment tank 2. The collected data was then preprocessed.

[0054] The preprocessing is dimensionless, and the specific formula is shown below:

[0055] ;

[0056] in, This represents the mean determined when the model was built; This indicates that a half-range is determined when the model is built; ;

[0057] After the above dimensionless transformation process, the parameters are transformed to... The interval is used to eliminate the influence of dimensions. and The values ​​were determined by the preliminary central composite design experiments (average oil content 20%, half-range 15%; average moisture content 60%, half-range 20%; average particle size 45mm, half-range 22.5mm; average loading amount 1.25t, half-range 0.75t) and were set as fixed constants in the PLC.

[0058] Step 2: Adjust the oil content after pretreatment in Step 1. Moisture content Particle size and loading capacity The initial opening degree of each proportional control valve 83 is obtained by inputting it into the feedforward model as a variable, and the target temperature is set. ,in, ;

[0059] The feedforward model adopts a quadratic response surface form for the initial opening of the i-th proportional control valve 83. The specific formula for the model is shown below:

[0060] ;

[0061] in, Indicates the first The initial opening degree of each proportional control valve; This represents the valve index, with a value range of 1-15, corresponding to a combination of 5 axial regions (A, B, C, D, E) and 3 radial regions (center region Z, inner ring region M, near-wall region W). Indicates the first The model constant term (intercept) of each valve represents the reference opening when all independent variables take the center value; No. The linear coefficients of each valve correspond to the oil content. Moisture content Particle size and loading capacity The first-order term reflects the linear effect of individual changes in each factor on the opening degree; Indicates the first The squared term coefficient of each valve reflects the nonlinear curvature effect of each factor; Indicates the first The cross term coefficient of each valve reflects the interaction between two different factors; The parameter model is obtained through preliminary + central composite design experiments and least squares fitting, and is pre-stored in the PLC's data block. Each proportional control valve 83 has 15 coefficients.

[0062] The quadratic response surface models of the 15 proportional control valves 83 have the same mathematical form, but their respective model parameters... The model parameters of different proportional control valves 83 were obtained by independently fitting the experimental data corresponding to the valve. The values ​​are different and cannot be used interchangeably.

[0063] Step 3: Close the door of chemical treatment tank 2, start the stirring system, and adjust the opening according to the initial opening obtained in Step 2. Open all proportional control valves 83 to begin the heating phase. Simultaneously, use armored thermocouples to collect real-time temperature data at 15 monitoring points in five axial regions (A, B, C, D, and E) and three radial regions (central region Z, inner ring region M, and near-wall region W) within the chemical treatment tank 2. The sampling period is 1 second.

[0064] Step 4: During the heating stage, a feedforward-feedback composite control is adopted to limit the maximum valve opening to 80% to prevent temperature overshoot. The temperature deviation is calculated in real time, and a PID control algorithm is executed to correct the opening of each proportional regulating valve 83.

[0065] The specific formula for calculating the temperature deviation in real time is shown below:

[0066] ;

[0067] The specific formula for the PID control algorithm is shown below:

[0068] ;

[0069] in, No. Each valve at time PID control output; This represents the valve index, with a value range of 1-15, corresponding to 15 independent temperature zones; This indicates the current time, starting from the warming phase; Indicates proportional gain; Indicates temperature deviation; Indicates the integral coefficient; This indicates the cumulative effect of deviation over time; Represents the differential coefficient; The rate of change of deviation; the PID parameters are independently tuned for each region using the Ziegler-Nichols method.

[0070] During this stage, the total corrected opening of the proportional control valve 83 is: The formula for the total corrected opening is as follows:

[0071] ;

[0072] During this stage, the final opening degree of the proportional control valve 83 is: The final opening formula is as follows:

[0073] ;

[0074] At the same time, the opening degree of each proportional regulating valve 83 will be limited between 0-100%. The signal is converted to 4-20mA and output to each proportional control valve 83, and the heating continues until the temperature of all areas reaches 165℃.

[0075] Safety mechanism: The feedback layer has the highest priority; any temperature deviation in any area will trigger a response. If a fault is detected in the armored thermocouple, the system will automatically exceed the feedforward setting and force entry into the safety mode (setting all valve openings to 100% and issuing an alarm).

[0076] Step 5: Once the temperature in all areas reaches the set target temperature of 165℃, the temperature will enter the constant temperature stage, which will last for 4 hours, with the target temperature maintained at 165±0.5℃.

[0077] During the constant temperature phase, PID control continues, and a temperature gradient collaborative control algorithm is activated to calculate the temperature difference between adjacent zones in real time. The specific calculation formula is shown below:

[0078] ;

[0079] Preset temperature difference threshold ,when When calculating the collaborative correction amount, the calculation formula is as follows:

[0080] ;

[0081] in, Indicates the first Each valve at time The amount of collaborative correction; Representation and region An index to a neighboring region; and Representing regions and region The current real-time temperature; Represents the synergy coefficient, here ; Representation and region Adjacent region set; Indicates to All adjacent areas Summation; Represents a symbolic function. The value is +1. The value is -1. This represents a function that takes the maximum value to ensure that corrections are only generated when the temperature difference exceeds a threshold, thus avoiding reverse adjustment. This represents the absolute value of the temperature difference between adjacent areas.

[0082] During this stage, the total corrected opening of the proportional control valve 83 is: The formula for the total corrected opening is as follows:

[0083] ;

[0084] During this stage, the final opening degree of the proportional control valve 83 is: The final opening formula is as follows:

[0085] ;

[0086] The opening of each proportional regulating valve 83 is limited to between 0-100%. Through this coordinated control, the temperature difference between adjacent areas is forced to not exceed 5℃, which significantly improves the temperature uniformity inside the tank.

[0087] Step Six: After the 4-hour duration specified in Step Five is achieved, when the temperature deviation in all areas... And if the duration exceeds 10 minutes, it will automatically enter the heat preservation stage;

[0088] During the heat preservation phase, temperature gradient coordinated control is turned off. At the same time, lock the integral term in the PID control (i.e., set the integral coefficient). Only the proportional and differential terms are retained for fine-tuning to avoid minor oscillations caused by integral saturation. The temperature inside the chemical treatment tank 2 is maintained at 165±0.5℃. After the heat preservation stage lasts for 30 minutes, the chemical treatment process ends.

[0089] Step 7: Close the steam valve and open the discharge port of chemical tank 2 to discharge the processed material.

[0090] As one embodiment of the present invention, such as Figure 6As shown, the pig slaughter waste is crushed by the crusher 1 and then conveyed to the rendering tank 2 through the conveying channel 3. Simultaneously, the vibrating material distribution device 6 at the conveying channel 3 is activated, and the material flows through the detection area at a rate of approximately 0.5 kg / s. The near-infrared spectroscopy detection unit 41 outputs a set of oil and moisture content data every 2 seconds, taking the average of 10 data points; the machine vision detection unit 42 counts at least 200 particles to calculate particle size parameters; and the weighing unit 7 outputs the total weight of the crushed pig slaughter waste entering the rendering tank 2.

[0091] The detected data is input into the feedforward model to calculate the initial opening of each proportional control valve and set the target temperature to 165℃.

[0092] Close the tank door, start the agitator, and press... Open all proportional control valves 83; the PLC collects 15 temperature readings at a 1-second cycle. ; Calculate the deviation ; Perform PID calculation; calculate the collaborative correction during the isothermal stage; finally, calculate the final opening degree. The output is sent to each proportional regulating valve 83 and continues for 4 hours; when all It lasts for 10 minutes, then enters the heat preservation stage, and ends after 30 minutes.

[0093] To establish the feedforward model, a center-composite design (CCD) experiment was designed. The experimental factors and levels are shown in Table 1.

[0094] Table 1

[0095] factor unit level Fat content % 5,15,25,35 Moisture content % 40,55,70,80 Particle size mm 50 Loading volume t 0.5,1.0,1.5,2.0

[0096] Table 1 is a statistical table of experimental factors and levels;

[0097] By adding refined animal fat and tap water to adjust the oil and moisture content, and using sieves of different aperture sizes to obtain the specified particle size, and with a fixed target temperature of 165℃ and a stirring speed of 15 rpm, the experiment was run multiple times under each set of material characteristics using different combinations of the opening of the proportional control valve 83. The sterilization compliance rate, steam consumption, rendering time, oil extraction rate, and meat and bone meal quality were recorded. The optimal opening vector of the proportional control valve 83 was derived through multi-objective optimization (weighted comprehensive scoring method), with the center point repeated three times, resulting in 80 valid experiments. The least squares method was used to fit a quadratic response surface model to obtain the model coefficients.

[0098] A comparative experiment was conducted using the system and method of this invention and a traditional fixed-parameter humidifier to treat slaughterhouse waste (15%-30% grease, 50%-75% water content) from the same source. Ten batches of each were treated, and the results are shown in Table 2.

[0099] Table 2

[0100] index Traditional equipment This invention Improvement rate Average steam consumption (kg / ton of material) 520 415 20.2 Average preparation time (h) 7.2 6.0 15.6 Maximum temperature difference in the temperature field (°C) 12.3 2.1 82.9 Sterilization pass rate (%) 98.2 100 1.8 Oil extraction rate (%) 89.5 93.2 4.1

[0101] As can be seen from the data recorded in Table 2, the technical solution of the present invention can significantly reduce energy consumption, shorten the processing cycle, improve the uniformity of the temperature field, and improve the consistency of the processing effect.

[0102] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for harmless treatment of waste from pig slaughtering, comprising a crusher (1), a rendering tank (2), a conveying channel (3), a weighing unit (7), and a controller, characterized in that: Also includes: The detection mechanism (4) includes a near-infrared spectroscopy detection unit (41) and a machine vision detection unit (42). Near-infrared spectroscopy detection unit (41) is installed above the conveying channel (3) and is used to detect the oil content and moisture content of the crushed waste. A machine vision inspection unit (42) is installed above the conveying channel (3) to detect the particle size distribution of the crushed waste. A vibrating material leveling device (6) is installed inside the conveying channel (3) to level the material; A zoned steam injection module (8) is installed inside the chemical treatment tank (2), including multiple nozzles (84) distributed along the axial and radial directions of the chemical treatment tank and proportional regulating valves (83) that are independently controlled. The multi-zone temperature detection module includes multiple temperature sensors set in different zones inside the chemical reaction tank (2) for real-time acquisition of the temperature of each zone; The controller includes a feedforward control unit and a feedback control unit. The feedforward control unit calculates the initial opening of each proportional control valve (83) based on the detection data of the near-infrared spectroscopy detection unit (41), the machine vision detection unit (42), and the weighing unit (7) through a feedforward model. The feedback control unit calculates the corrected opening of each proportional control valve (83) based on the temperature data of the multi-region temperature detection module using a PID control algorithm and a temperature gradient collaborative control algorithm.

2. The waste treatment equipment for pig slaughtering according to claim 1, characterized in that: The chemical treatment tank (2) is divided into 5 regions along the axis and 3 regions along the radial direction, forming a total of 15 temperature monitoring regions; each temperature monitoring region is equipped with a proportional regulating valve (83) and a temperature sensor.

3. The waste treatment equipment for pig slaughtering according to claim 1, characterized in that: The partitioned steam injection module (8) includes a main steam pipe (81) and five rows of distribution ring pipes (82) arranged along the axial direction of the chemical tank. Each row of distribution ring pipes is provided with three branch pipe interfaces along the circumference. Each interface is connected to a proportional regulating valve (83) and a nozzle (84). Among them, the nozzle corresponding to the central area adopts a wide-angle solid cone nozzle with a spray angle of 75°, the nozzle corresponding to the inner ring area adopts a medium-angle solid cone nozzle with a spray angle of 50°, and the nozzle corresponding to the near-wall area adopts a narrow-angle flat nozzle with a spray angle of 30°.

4. The waste treatment equipment for pig slaughtering according to claim 1, characterized in that: The feedforward model adopts a quadratic response surface model, for the th The initial opening of each proportional control valve The expression is as follows: ； in, For oil content, Moisture content, For particle size, The loading amount is used; the model parameters are obtained through central composite design experiments and least squares fitting and are pre-stored in the controller.

5. The waste treatment equipment for pig slaughtering according to claim 1, characterized in that: The temperature gradient collaborative control algorithm is configured to calculate a collaborative correction amount when the temperature difference between adjacent regions exceeds a preset threshold. Adjust the opening degree of the corresponding proportional regulating valve to control the temperature difference within the specified range.

6. The waste treatment equipment for pig slaughtering according to claim 1, characterized in that: The formula for calculating the collaborative correction amount is as follows: ； in, For the synergy coefficient, This represents the absolute value of the temperature difference between adjacent areas. This is the temperature difference threshold.

7. The waste treatment equipment for pig slaughtering according to claim 1, characterized in that: The controller is configured to perform feedforward-feedback composite control during the heating phase, simultaneously perform PID control and temperature gradient coordinated control during the isothermal phase, and lock the integral term in the PID control and disable the temperature gradient coordinated control during the heat preservation phase.

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