Intermittent anti-pinch feeding conveying device for quantitative packaging of granular materials and control method thereof

Abstract

The application discloses an intermittent anti-pinch feeding conveying device for quantitative packaging of granular materials and a control method thereof, and belongs to the technical field of food industrial processing and intelligent manufacturing equipment, and comprises a rack, a feeding conveying belt located at one side of the rack and used for conveying granular materials, a screening assembly located at the top of the rack and used for receiving and screening the granular materials output by the feeding conveying belt, and a storage hopper located below the screening assembly and used for receiving the screened granular materials. By acquiring reference driving information when the screening assembly is in an empty running state and actual driving information in a screening process, a difference between the two is used to determine a residual material amount on a screening surface, a change rate of the difference is used to determine a release rate of the residual material, and a required sealing time for sealing of a sealing component is combined to determine an expected cumulative release amount within the sealing time.

Description

Technical Field

[0001] This invention relates to the field of food industrial processing and intelligent manufacturing equipment technology, and in particular to an intermittent anti-pinch feeding conveyor device and its control method for quantitative packaging of granular materials. Background Technology

[0002] Quantitative packaging of granular materials is a crucial step in food processing, agricultural product processing, and industrial material production. It typically involves sequentially completing operations such as material lifting, impurity screening, temporary buffering, quantitative receiving, transfer and unloading, and packaging box conveying. For materials like peanuts, beans, nuts, grains, and puffed pellets, due to differences in particle size, shape, surface friction coefficient, and bulk density, the transition phase between the cessation of feeding at the screening stage and the closure of the discharge path by the feeding assembly also requires consideration of tail material release, quantitative cavity filling, and sealing actions to reduce particle clamping, crushing, and scattering.

[0003] Current quantitative packaging of granular materials typically employs gravity feeding, vibratory feeding, screw feeding, or belt feeding to convey materials, and determines the packaging quantity per batch through weighing, volumetric measurement, or material level detection. In terms of control, feeding, screening, receiving, and sealing actions are controlled separately based on preset running time, weighing feedback, material level signals, or actuator position signals. When feeding stops, residual material in the equipment is typically handled by fixing the cleaning time, fixing the vibration intensity, or manually adjusting the feeding parameters, and the unloading assembly is moved to seal the material upon reaching a set time or target signal.

[0004] However, the residual material in the screening component has the characteristics of continuous release and gradual decay. Existing control methods are difficult to identify the amount of residual material and the release rate at the same time based on the driving state of the screening component. They are also difficult to predict the cumulative release during the sealing period by combining the time required for the feeding component to complete the sealing. At the same time, the bulk density and void distribution of particulate material fluctuate. It is difficult to determine the actual filling degree and expected capacity of the feeding component in a timely manner by relying solely on fixed timing, weighing, or a single material level signal. Therefore, the cumulative release during the upstream sealing period does not have a direct match with the downstream acceptable material amount, which can easily lead to insufficient filling, excessive tail material, spillage, and particles being clamped or squeezed during the sealing process, affecting packaging consistency and operational stability. Summary of the Invention

[0005] This invention overcomes the shortcomings of the prior art and provides an intermittent anti-pinch feeding conveyor device and its control method for quantitative packaging of granular materials.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: an intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials, comprising:

[0007] frame;

[0008] A feeding conveyor belt, located on one side of the frame, is used for conveying granular materials;

[0009] The screening assembly, located at the top of the frame, is used to receive and screen the granular material output from the feeding conveyor belt;

[0010] A storage hopper, located below the screening assembly, is used to receive the granular material after screening.

[0011] The feeding assembly, located below the storage hopper, is used to receive granular materials at the receiving position and sequentially close the discharge path of the storage hopper and discharge materials into the packaging box when moving to the discharge position.

[0012] A conveyor belt, located below the unloading assembly, is used to transport the packaging boxes to the unloading position;

[0013] The controller is connected to the feeding conveyor belt, screening assembly, unloading assembly, and conveyor belt, respectively.

[0014] The controller is used to determine the expected cumulative release amount based on the no-load reference drive information of the screening component, the actual drive information, and the sealing time required for the feeding component to complete sealing; to determine the expected capacity margin based on the drive load during the reciprocating micro-displacement process of the feeding component; to adjust the pulse feeding state of the feeding conveyor belt and the vibration state of the screening component based on the difference between the two; and to control the feeding component to leave the receiving position when the two meet the preset matching conditions and the screening component is in a low flow release state.

[0015] In a preferred embodiment of the present invention, the screening assembly includes a plurality of columns bolted to the top of the frame, the top of the columns being provided with a housing, and the bottom of the housing being provided with a screen.

[0016] In a preferred embodiment of the present invention, a plurality of springs are provided on both sides of the bottom of the screen, a transmission wheel is provided at the bottom of the screen, and a drive motor is provided at the top of the frame, the drive motor being connected to the transmission wheel.

[0017] In a preferred embodiment of the present invention, the feeding assembly includes a conveying pipe disposed at the bottom of the storage hopper, a fixing plate sleeved on the outer wall of the conveying pipe, and a support plate disposed at the bottom of the fixing plate.

[0018] In a preferred embodiment of the present invention, a feeding tank is provided on the top of the support plate, and a movable bottom door is hinged to the bottom of the feeding tank. A push rod is provided on one side of the fixed plate, and the push rod is located on the side of the fixed plate away from the feeding tank and connected to the feeding tank.

[0019] Secondly, the present invention provides a control method for intermittent anti-pinch feeding conveying for quantitative packaging of granular materials, comprising the following steps:

[0020] S1. Obtain the no-load reference drive information and actual drive information of the screening component, and determine the expected cumulative release amount within the sealing time based on the difference between the two, the rate of change of the difference, and the sealing time required for the feeding component to complete the sealing.

[0021] S2. When the feeding component is in the position of receiving material and the bottom is closed, it performs at least two reciprocating micro-displacements with a preset stroke and a preset speed. Based on the driving load of each micro-displacement and the difference between adjacent driving loads, the expected capacity is determined.

[0022] S3. When the difference between the expected cumulative release amount and the expected remaining capacity is greater than the upper limit of the preset matching range, reduce the vibration intensity of the screening component or pause the screening component; when the difference is less than the lower limit of the preset matching range, control the feeding conveyor belt to perform pulse feeding.

[0023] S4. When the expected cumulative release amount and the expected remaining capacity meet the preset matching conditions, and the absolute value of the difference in driving information of the screening component, the rate of change of the difference, and the fluctuation amplitude are all lower than the corresponding threshold, control the feeding component to leave the receiving position.

[0024] S5. Control the material feeding component to close the discharge path of the storage hopper and unload the material into the packaging box during the movement process, and update the feeding parameters, vibration parameters and sealing parameters of the subsequent packaging cycle according to the matching process of this packaging cycle.

[0025] In a preferred embodiment of the present invention, in step S1, the no-load reference drive information is the reference current of the drive motor when the screening component is running under no-load conditions, and the actual drive information is the actual current of the drive motor during the screening process; the amount of residual material in the screening component is determined based on the difference between the actual current and the reference current, the release rate of the residual material is determined based on the rate of change of the difference, and the expected cumulative release amount is determined based on the amount of residual material, the release rate, and the sealing time.

[0026] In a preferred embodiment of the present invention, in step S2, the stroke of the reciprocating micro-displacement is 1-5mm and the speed is 5-20mm / s; during each reciprocating micro-displacement, the driving load of the actuator that drives the material feeding component to move is obtained, the current filling degree is determined according to each driving load, and the current filling degree is converted into the current filling amount; the expected capacity margin is determined according to the difference between the target filling amount and the current filling amount.

[0027] In a preferred embodiment of the present invention, in step S3, when the difference between the expected cumulative release amount and the expected remaining capacity is greater than the upper limit of the preset matching range, the vibration intensity of the screening component is reduced or the screening component is paused; when the difference is less than the lower limit of the preset matching range, the feeding conveyor belt is controlled to perform pulse feeding; when the difference is within the preset matching range, it is determined that the preset matching condition is met.

[0028] In a preferred embodiment of the present invention, in step S4, the difference in driving information of the screening component is the difference between the actual driving information and the no-load reference driving information; when the absolute value of the driving information difference, the rate of change of the difference, and the fluctuation amplitude are all lower than the corresponding threshold, it is determined that the screening component is in a low flow release state, and the feeding component is controlled to leave the receiving position.

[0029] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0030] (1) By acquiring the reference drive information of the screening component during no-load operation and the actual drive information during the screening process, the amount of residual material on the screen surface is determined by the difference between the two, and the release rate of the residual material is determined by the rate of change of the difference. Combined with the sealing time required for the feeding component to complete the sealing, the expected cumulative release amount within the sealing time is determined. At the same time, when the feeding component is in the process of receiving material and the bottom is closed, it is controlled to perform at least two reciprocating micro-displacements with a preset stroke and a preset speed. The current filling degree and the expected capacity are determined based on the driving load of each micro-displacement and the difference between adjacent driving loads. Thus, the amount of material that may continue to enter during the sealing period and the amount of material that the feeding component can actually accept are converted into two quantities that can be directly compared, avoiding the estimation of the material state based solely on a fixed feeding time, a fixed cleaning time or a single material level signal, improving the accuracy of material quantity judgment and the consistency of loading in each packaging cycle.

[0031] (2) Adjust the feeding conveyor belt and screening components in conjunction with the difference between the expected cumulative release and the expected remaining capacity, instead of making the feeding, vibration and receiving links operate at independent fixed rhythms; when the difference is greater than the upper limit of the preset matching range, reduce the vibration intensity of the screening components or pause the screening components to limit the continued release of tail material; when the difference is less than the lower limit of the preset matching range, control the feeding conveyor belt to perform pulse feeding to make up for the remaining loading demand of the unloading components; when the difference is within the preset matching range, determine that the preset matching conditions are met; so as to reduce the mismatch between tail material release and filling capacity caused by changes in material particle size, flowability and bulk density, reduce the probability of overfilling or underfilling, and improve the equipment's adaptability to different batches of particulate materials.

[0032] (3) Based on the fact that the expected cumulative release and the expected remaining capacity meet the preset matching conditions, determine whether the difference between the actual driving information of the screening component and the empty reference driving information, the absolute value of the difference change rate and the fluctuation amplitude are all lower than the corresponding threshold. Only when the screening component is in a low flow release state, control the feeding component to leave the receiving position, and unload the material into the packaging box after closing the discharge path of the storage hopper during the movement, so that the sealing action avoids the stage of concentrated falling of tail material, and reduces the situation of particles being clamped, squeezed or broken at the closed edge. After each packaging cycle, update the feeding parameters, vibration parameters and sealing parameters according to the matching process of the expected cumulative release and the expected remaining capacity, so that the matching adjustment and sealing action of the subsequent cycle are faster and more stable, and improve the reliability and efficiency of continuous packaging. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a perspective structural diagram of a preferred embodiment of the present invention;

[0035] Figure 2 This is a three-dimensional structural diagram of the storage hopper according to a preferred embodiment of the present invention;

[0036] Figure 3 This is a three-dimensional structural diagram of the screening component according to a preferred embodiment of the present invention;

[0037] Figure 4 This is a three-dimensional structural diagram of the feeding assembly according to a preferred embodiment of the present invention;

[0038] Figure 5 This is a flowchart of a preferred embodiment of the present invention;

[0039] Figure 6 This is a flowchart of the sub-flowchart for determining and matching the expected cumulative release amount and expected capacity reserve in a preferred embodiment of the present invention;

[0040] Figure 7 This is a flowchart of the low-flow release state determination, sealing and unloading, and parameter update sub-processes of a preferred embodiment of the present invention.

[0041] In the diagram: 1. Feeding conveyor belt; 2. Frame; 3. Screening assembly; 31. Column; 32. Screen; 33. Spring; 34. Drive wheel; 36. Housing; 35. Drive motor; 4. Storage hopper; 5. Discharge assembly; 51. Conveying pipe; 52. Fixing plate; 53. Support plate; 54. Discharge tank; 55. Push rod; 6. Conveyor belt. Detailed Implementation

[0042] 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.

[0043] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0044] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] Application Overview:

[0047] The reasons for fluctuations in packaging volume and sealing clamping are not only due to unreasonable settings of screening or feeding time, but also to the dynamic coupling between the release process of tail material in the screening component and the remaining capacity of the feeding component. After the screening component stops receiving new material, the residual material on the screen surface will continue to be released at a gradually decreasing rate. The feeding component needs a certain amount of time to complete the closure of the discharge path, and tail material may still be received during the sealing period. At the same time, the particle bulk density and void distribution are not exactly the same in different packaging cycles, causing fluctuations in the current filling degree and remaining capacity of the feeding component. If each actuator is controlled separately based on fixed delay, single material level or preset feeding amount, it is difficult to determine how much tail material will be released during the sealing period, and it is also difficult to determine whether this part of the tail material can be accepted by the feeding component.

[0048] The applicant discovered that it is possible to obtain the baseline drive information of the screening component during no-load operation and the actual drive information during the screening process. The difference between these two values ​​can be used to identify the amount of residual material on the screen surface, and the rate of change of this difference can be used to identify the release rate of the residual material. Combined with the sealing time required for the feeding component to complete sealing, the expected cumulative release amount during the sealing period can be determined. Furthermore, the feeding component can be controlled to perform at least two reciprocating micro-displacements at a preset stroke and speed while maintaining material reception and bottom closure. The current filling level can be identified based on the drive load of each micro-displacement and the difference in drive loads between adjacent micro-displacements, thereby determining the expected remaining capacity. This allows for the separate acquisition of the upstream material to be released and the downstream material to be accepted without adding an independent weighing station.

[0049] The applicant proposes to calculate the difference between the expected cumulative release and the expected remaining capacity, and adjust the vibration intensity of the screening component or control the feeding conveyor belt to perform pulse feeding based on this difference. When the two meet the preset matching conditions, and the absolute value of the difference in the driving information of the screening component, the rate of change of the difference, and the fluctuation amplitude are all lower than the corresponding threshold, the feeding component is controlled to leave the receiving position, and the discharge path of the storage hopper is closed and the material is unloaded into the packaging box during the movement. Subsequently, the feeding parameters, vibration parameters, and sealing parameters of the subsequent cycle are updated according to the matching process of this packaging cycle. This makes the expected cumulative release, expected remaining capacity, adjustment action, and sealing timing form a continuous control link, reducing insufficient filling, excessive tail material, and sealing jamming, and improving the stability and continuity of the granular material packaging process.

[0050] like Figures 1-4 As shown, an intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials includes: a frame 2, a feeding conveyor belt 1, a screening component 3, a storage hopper 4, a discharging component 5, a conveyor belt 6, and a controller.

[0051] Specifically, frame 2 provides a supporting foundation for the entire device and is fixedly installed in the working position; the feeding conveyor belt 1 is located on one side of frame 2 and is used to lift and transport the granular material to be packaged from upstream to the screening component 3; the screening component 3 is located at the top of frame 2 and is used to receive and screen the granular material output from the feeding conveyor belt 1 to remove debris and impurities; the storage hopper 4 is located below the screening component 3 and is used to receive the screened granular material and temporarily store and buffer it.

[0052] Specifically, the feeding component 5 is located below the storage hopper 4, used to receive granular materials at the receiving position, and sequentially close the discharge path of the storage hopper 4 and discharge the materials to the packaging box when moving to the discharge position; the conveyor belt 6 is located below the unloading component 5, used to transport the packaging box to the discharge position; the controller is connected to the feeding conveyor belt 1, the screening component 3, the unloading component 5 and the conveyor belt 6 respectively, and is used to coordinate and control the operating status of each component.

[0053] Furthermore, the feeding conveyor belt 1 is located on one side of the frame 2, with a drive roller and a driven roller at each end, and the conveyor belt is sleeved between the drive roller and the driven roller; baffles are spaced on the outer wall of the conveyor belt sleeve; the feeding end of the feeding conveyor belt 1 extends to the material storage area, and the discharging end extends above the screening component 3; the feeding conveyor belt 1 is driven by an independent motor to lift the granular material from a low position to a high position and put it into the housing 36 of the screening component 3.

[0054] Furthermore, several columns 31 are provided, and the bottom of each column 31 is fixedly connected to the top of the frame 2 by bolts. The columns 31 extend vertically and are distributed around the shell 36. The shell 36 is fixedly installed on the top of each column 31. The shell 36 is a box structure with an open top, and its interior forms a cavity for containing materials.

[0055] Furthermore, a screen 32 is provided at the bottom of the housing 36. The screen 32 has screen holes of a predetermined diameter for screening fine materials. Several springs 33 are provided on both sides of the bottom of the screen 32. One end of the spring 33 is connected to the screen 32 and the other end is connected to the frame 2. The springs 33 provide elastic support for the screen 32, so that the screen 32 can maintain a stable motion state during vibration.

[0056] Specifically, a drive wheel 34 is provided at the bottom of the screen 32, and the drive wheel 34 is fixedly connected to the screen 32; a drive motor 35 is provided at the top of the frame 2, and the output end of the drive motor 35 is connected to the drive wheel 34 through a gear belt.

[0057] It should be noted that when the drive motor 35 starts, the drive motor 35 drives the transmission wheel 34 to rotate. The transmission wheel 34 converts the rotational motion into the reciprocating vibration of the screen 32, so that the broken material and fine residue on the screen 32 are evenly distributed under the action of vibration and pass downward through the screen holes. During the vibration of the screen 32, the spring 33 provides elastic buffering and reset function for the screen 32, making the vibration of the screen 32 more stable.

[0058] Specifically, the storage hopper 4 is located on one side of the bottom of the screening component 3, and its bottom narrows to form a discharge port, which is connected to the conveying pipe 51 of the feeding component 5; the inner wall of the storage hopper 4 is provided with an inclined guiding surface to guide the granular material to flow smoothly downward into the feeding component 5.

[0059] Specifically, the conveying pipe 51 is fixedly installed at the bottom of the storage hopper 4 and connected to the discharge port of the storage hopper 4, and is used to guide the granular material in the storage hopper 4 downward; a fixing plate 52 is sleeved on the outer wall of the conveying pipe 51, the fixing plate 52 is horizontally installed and fixedly connected to the conveying pipe 51; a support plate 53 is provided on one side of the bottom of the fixing plate 52, the support plate 53 extends in the vertical direction, and is used to support the feeding tank 54.

[0060] Furthermore, the feeding tank 54 is located on top of the support plate 53. The feeding tank 54 is a cylindrical container with an open top, and its interior forms a metering cavity for receiving particulate materials. The bottom of the feeding tank 54 is hinged to a movable bottom door, which can rotate between a closed position and an open position.

[0061] It should be noted that when the movable bottom door is in the closed position, the bottom of the feeding tank 54 is sealed, and the granular material can be temporarily stored in the feeding tank 54; when the movable bottom door is in the open position, the material in the feeding tank 54 is discharged downwards into the packaging box on the conveyor belt 6 under the action of gravity.

[0062] Specifically, the push rod 55 is located on the side of the fixed plate 52 away from the feeding tank 54. One end of the push rod 55 is connected to the fixed plate 52, and the other end is connected to the feeding tank 54. The push rod 55 is a cylinder, hydraulic cylinder, or electric push rod. When the push rod 55 extends or retracts, it drives the feeding tank 54 to move horizontally relative to the conveying pipe 51, so that the feeding tank 54 switches between the receiving position and the unloading position.

[0063] Specifically, the controller is electrically connected to the motor of the feeding conveyor belt 1, the drive motor 35 of the screening component 3, the push rod 55 of the unloading component 5, the drive mechanism of the movable bottom door, and the motor of the conveyor belt 6, respectively. The controller obtains the no-load reference drive information and the actual drive information of the screening component 3, and determines the expected cumulative release amount based on the difference between the two, the rate of change of the difference, and the sealing time required for the unloading component 5 to complete the sealing. The controller controls the unloading component 5 to perform reciprocating micro-displacement and determines the expected capacity based on the drive load.

[0064] It should be noted that the pulse feeding state of the feeding conveyor belt 1 and the vibration state of the screening component 3 are adjusted according to the difference between the two, and the unloading component 5 is controlled to leave the receiving position when the preset matching conditions and low flow release conditions are met; the controller can be a programmable logic controller (PLC) or an industrial computer, which has a preset control program to execute the control method of intermittent anti-pinch feeding conveyor.

[0065] Specifically, the conveyor belt 6 is located below the unloading assembly 5. Both ends of the conveyor belt 6 are respectively equipped with a drive roller and a driven roller. The conveyor belt is sleeved between the drive roller and the driven roller. The upper surface of the conveyor belt 6 is horizontally positioned to carry and transport the packaging boxes. The conveyor belt 6 is driven by an independent motor to transport empty packaging boxes to the unloading position below the unloading tank 54 and to transport filled packaging boxes to the next process.

[0066] like Figure 5 As shown, a control method for intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials includes the following steps:

[0067] S1. Obtain the no-load reference drive information and actual drive information of the screening component 3, and determine the expected cumulative release amount within the sealing time based on the difference between the two, the rate of change of the difference, and the sealing time required for the feeding component 5 to complete the sealing.

[0068] S2. When the feeding component 5 is in the position of receiving material and the bottom is closed, it performs at least two reciprocating micro-displacements with a preset stroke and a preset speed. Based on the driving load of each micro-displacement and the difference between adjacent driving loads, the expected capacity is determined.

[0069] S3. When the difference between the expected cumulative release amount and the expected remaining capacity is greater than the upper limit of the preset matching range, reduce the vibration intensity of the screening component 3 or pause the screening component 3; when the difference is less than the lower limit of the preset matching range, control the feeding conveyor belt 1 to perform pulse feeding.

[0070] S4. When the expected cumulative release amount and the expected remaining capacity meet the preset matching conditions, and the absolute value of the difference in driving information, the rate of change of the difference, and the fluctuation amplitude of the screening component 3 are all lower than the corresponding threshold, the feeding component 5 is controlled to leave the receiving position.

[0071] S5. Control the feeding component 5 to close the discharge path of the storage hopper 4 and unload the material into the packaging box during the movement process, and update the feeding parameters, vibration parameters and sealing parameters of the subsequent packaging cycle according to the matching process of this packaging cycle.

[0072] The core innovation of this invention lies in: incorporating the sealing time required for the feeding component 5 to complete sealing into the tail material prediction; determining the expected cumulative release amount within the sealing time based on the difference between the no-load reference drive information and the actual drive information of the screening component 3 and the rate of change of the difference; determining the expected capacity margin by using the reciprocating micro-displacement of the feeding component 5 according to the preset stroke and preset speed, and utilizing the difference between each drive load and adjacent drive loads; and then adjusting the vibration state of the screening component 3 and the pulse feeding state of the feeding conveyor belt 1 in linkage according to the difference between the two, and performing sealing and unloading when the preset matching conditions and low flow release conditions are simultaneously met.

[0073] Each step will be explained in detail below.

[0074] In step S1, the no-load reference drive information and actual drive information of the screening component 3 are obtained. Based on the difference between the two, the rate of change of the difference, and the sealing time required for the feeding component 5 to complete the sealing, the expected cumulative release amount within the sealing time is determined.

[0075] The granular material is lifted from the material storage area to the screening component 3 by the feeding conveyor belt 1. The screening component 3 screens the granular material to remove debris and impurities. After that, the material enters the unloading component 5 located at the receiving position through the storage hopper 4.

[0076] The feeding component 5 keeps its bottom closed at the receiving position and continues to receive granular materials. The granular materials gradually accumulate in the quantitative cavity of the feeding component 5, while the residual materials in the screening component 3 continue to be released downwards.

[0077] When the screening component 3 is running unloaded and the vibration intensity is stable, the controller collects the current value of the drive motor 35 as the unloaded reference drive information; during the screening of particulate materials, the current value of the drive motor 35 is collected in real time as the actual drive information.

[0078] No-load operation refers to the operating state when there is no material covering the surface of the screen 32. At this time, the output of the drive motor 35 is mainly used to overcome the inertia of the screen 32 itself, the resistance of the spring 33 and the frictional resistance of the transmission mechanism.

[0079] When the surface of the screen 32 carries residual material, the weight of the material and its motion inertia cause the actual driving information of the drive motor 35 to change relative to the no-load reference driving information. The difference between the two can reflect the amount of residual material on the surface of the screen 32.

[0080] As residual material is gradually released, the driving information difference shows a downward trend. The rate of change of the difference over time can reflect the release rate of residual material. The larger the difference, the more residual material there is. The faster the difference decreases, the faster the material is released.

[0081] The sealing time refers to the estimated time required from the current moment until the material feeding component 5 leaves the receiving position and completes the closure of the material discharge path of the storage hopper 4. This time constitutes the predicted time range of the estimated cumulative release.

[0082] The controller determines the current amount of residual material and release rate based on the pre-calibrated correspondence between the difference in drive information and the amount of residual material, and the correspondence between the rate of change of the difference and the release rate, and makes a cumulative prediction in combination with the sealing time.

[0083] The expected cumulative release amount refers to the amount of particulate material that the screening component 3 is expected to continue releasing to the storage hopper 4 and the feeding component 5 from the current moment until the feeding component 5 completes the closure of the discharge path.

[0084] In step S2, while the feeding component 5 is holding the material and the bottom is closed, it performs at least two reciprocating micro-displacements with a preset stroke and a preset speed. Based on the driving load of each micro-displacement and the difference between adjacent driving loads, the expected capacity is determined.

[0085] Reciprocating micro-displacement refers to the small-range reciprocating movement of the feeding component 5 relative to the discharge port of the storage hopper 4 in the horizontal direction. The stroke of the reciprocating micro-displacement is 1-5mm, and the speed is 5-20mm / s.

[0086] During each reciprocating micro-displacement process, the controller acquires the driving load of the actuator that drives the feeding component 5 to move, and the driving load is the driving force or driving pressure of the push rod 55.

[0087] The higher the material filling degree and the denser the accumulation inside the feeding component 5, the greater the force exerted by the material on the inner wall of the feeding component 5, and the greater the driving load required to perform reciprocating micro-displacement; when the filling degree is low, the driving load decreases accordingly.

[0088] The controller compares the driving load of each reciprocating micro-displacement and calculates the difference in driving load between two adjacent reciprocating micro-displacements; the difference in driving load and its changing trend are used to characterize the filling change of particulate material in the feeding assembly 5.

[0089] By pre-calibrating the driving load corresponding to different filling levels and the differences between adjacent driving loads, a correspondence between driving load characteristics and the current filling level is established.

[0090] The current filling degree of the feeding component 5 is determined based on the driving load of each reciprocating micro-displacement, and the current filling degree is corrected based on the difference in driving load between two adjacent reciprocating micro-displacements and its changing trend.

[0091] The controller determines the current filling level of the feeding component 5 according to the correspondence, and uses the target filling amount of the feeding component 5 as the target filling benchmark for this packaging cycle.

[0092] Based on the difference between the target filling amount and the current filling level, determine the amount of particulate material that the feeding component 5 can still accept from the current state to the target filling state, i.e., the expected capacity.

[0093] The expected capacity decreases as the current filling level increases and increases as the current filling level decreases, which is used to characterize the ability of the feeding component 5 to accept subsequently released materials before sealing.

[0094] Each reciprocating micro-displacement uses the same preset stroke and preset speed, making the drive loads in different micro-displacement processes comparable, and using the difference in adjacent drive loads to reduce the impact of actuator base load fluctuations on filling judgment.

[0095] Therefore, the feeding component 5 can actively detect the current filling level while maintaining normal material receiving, and obtain the expected capacity without interrupting the current packaging cycle.

[0096] In step S3, the difference between the expected cumulative release amount and the expected remaining capacity is calculated, and the pulse feeding state of the feeding conveyor belt 1 and the vibration state of the screening component 3 are adjusted according to the difference.

[0097] The difference is used to characterize the deviation between the expected amount of material entering the feeding component 5 during the sealing period and the amount of material that the feeding component 5 can accept. The difference is the expected cumulative release amount minus the expected capacity.

[0098] When the difference is greater than the upper limit of the preset matching range, it indicates that the tail material expected to be released during the sealing period will exceed the acceptable space of the feeding component 5. If no adjustment is made, it may cause material accumulation, spillage, or sealing material jamming.

[0099] When the difference is less than the lower limit of the preset matching range, it indicates that the tail material expected to be released during the sealing period is insufficient to fill the remaining capacity of the feeding component 5. If no replenishment is made, the single packaging quantity may be insufficient.

[0100] When the difference is within the preset matching range, it indicates that the expected cumulative release amount matches the expected remaining capacity, and the preset matching condition is met.

[0101] During the adjustment process, the controller continuously updates the expected cumulative release amount and the expected remaining capacity, and repeatedly calculates the difference between the two until the difference falls within a preset matching range.

[0102] When the difference is greater than the upper limit of the preset matching range, the vibration intensity of the screening component 3 is reduced or the screening component 3 is paused to reduce the excitation force on the residual material on the screen surface and limit the continued release of tail material.

[0103] Reducing vibration intensity can slow down the rate at which residual material is released downwards, gradually decreasing the expected cumulative release amount and preventing the cumulative feed amount during the sealing period from exceeding the expected capacity.

[0104] When the difference is less than the lower limit of the preset matching range, the feeding conveyor belt 1 is controlled to perform pulse feeding to supplement a small amount of particulate material to the screening component 3.

[0105] Pulse feeding refers to the controller controlling the feeding conveyor belt 1 to operate in a short-time, intermittent manner. The duration and interval of pulse feeding are determined based on the magnitude of the difference.

[0106] The supplemented particulate material enters the feeding component 5 through the screening component 3 and the storage hopper 4, which increases the expected cumulative release amount during the sealing time and gradually approaches the expected capacity.

[0107] The preset matching condition is that the difference between the expected cumulative release amount and the expected remaining capacity is within a preset matching range, which includes an upper limit and a lower limit.

[0108] The preset matching range can be set according to the particle size, bulk density and flowability of the granular material to take into account both the allowable deviation of the packaging quantity and the integrity of the granular material.

[0109] In step S4, when the expected cumulative release amount and the expected remaining capacity meet the preset matching conditions, and the absolute value of the difference in driving information, the rate of change of the difference, and the fluctuation amplitude of the screening component 3 are all lower than the corresponding threshold, the feeding component 5 is controlled to leave the receiving position.

[0110] Based on the premise that the expected cumulative release amount and the expected remaining capacity meet the preset matching conditions, it is also necessary to determine whether the tail material release process of the screening component 3 has entered a low flow and stable state.

[0111] The difference in driving information of the screening component 3 is the difference between the actual driving information and the no-load reference driving information. The controller simultaneously calculates the rate of change of the difference and the fluctuation amplitude within a set time window.

[0112] When the absolute value of the driving information difference, the rate of change of the difference, and the fluctuation amplitude are all lower than their respective thresholds, it is determined that the screening component 3 is in a low flow release state.

[0113] If the difference in driving information is lower than the corresponding threshold, it indicates that the amount of residual material on the surface of screen 32 has been reduced to a low level.

[0114] If the absolute value of the rate of change of the difference is lower than the corresponding threshold, it indicates that the release rate of the residual material has become relatively flat; if the fluctuation amplitude is lower than the corresponding threshold, it indicates that there is no obvious instantaneous fluctuation in the release process of the tail material.

[0115] The low-flow release state refers to the state in which the residual material in the screening component 3 is released downwards at a low and relatively stable rate.

[0116] In this state, controlling the feeding component 5 to start moving can prevent a large amount of particulate material from falling towards the closed edge as the discharge path gradually closes, thereby reducing the probability of particles being clamped or squeezed.

[0117] The threshold values ​​for driving information difference, the threshold value for change rate, and the threshold value for fluctuation amplitude can be preset according to the structural parameters of the screening component 3 and the particle size and flow characteristics of the particulate material.

[0118] After the preset matching conditions and low flow release conditions are met simultaneously, the controller drives the push rod 55 to move, causing the feeding component 5 to leave the receiving position in the horizontal direction.

[0119] In step S5, the feeding component 5 moves so that its upper opening gradually deviates from the discharge port of the storage hopper 4, thereby closing the discharge path of the storage hopper 4.

[0120] After the discharge path is closed, the controller controls the bottom door of the feeding component 5 to open, unloading the granular material in the quantitative cavity into the packaging box on the conveyor belt 6.

[0121] After the current packaging cycle is completed, the controller updates the feeding parameters, vibration parameters, and sealing parameters for subsequent packaging cycles based on the matching process between the expected cumulative release and the expected remaining capacity.

[0122] The controller records the trajectory of the expected cumulative release, the trajectory of the expected remaining capacity, the trajectory of the difference between the two, the time required to reach the preset matching conditions, the number of pulse feedings, the number of vibration intensity adjustments, and the drive information when entering the low flow release state.

[0123] Based on the above records, the feeding parameters, vibration parameters, and sealing parameters for subsequent packaging cycles are adaptively updated.

[0124] The feeding parameters include the running speed of the feeding conveyor belt 1, the duration of pulse feeding, and the feeding interval; the vibration parameters include the vibration intensity adjustment range, the vibration intensity change rate, and the pause time of the screening component 3.

[0125] The sealing parameters include the timing of the material feeding component 5 leaving the receiving position, its moving speed, and the sealing time required to complete the sealing of the material discharge path of the storage hopper 4.

[0126] By statistically analyzing and updating the matching process across multiple packaging cycles, the expected cumulative release and expected capacity in subsequent cycles can more quickly enter the preset matching range, reducing repeated adjustments and improving packaging efficiency and filling consistency.

[0127] The data processing and judgment algorithms involved in steps S1 to S5 are described in detail.

[0128] like Figure 6 As shown, the specific procedures for steps S1 to S3 are as follows:

[0129] The algorithm for determining the expected cumulative release amount in step S1:

[0130] Obtain the reference drive information when the screening component 3 is running under no-load conditions; the reference drive information is the current value of the drive motor 35, denoted as... .

[0131] During the screening process, the controller collects the actual current value of the drive motor 35 in real time at a set sampling frequency. The sampling frequency is 100-500Hz.

[0132] Calculate the difference between the actual driving information and the reference driving information:

[0133] ;

[0134] in, for The difference between the actual current value at any given time and the no-load reference current value.

[0135] The state of the residual material is determined based on the difference in driving information, and the rate of change of the difference is calculated as follows:

[0136] ;

[0137] in, This represents the sampling interval.

[0138] when When the amount of material is large and the rate of change is close to zero, it indicates that the amount of residual material on the surface of screen 32 is large but the release rate is low; when When the value is large and the rate of change is negative, it indicates that the amount of residual material on the surface of screen 32 is large and is being continuously released; when When the change rate is small and close to zero, it indicates that the residual material has been basically released.

[0139] in, This is the conversion factor between current difference and material quantity. This is the correction factor for the rate of change.

[0140] coefficient and The calibration was obtained through preliminary experiments; during calibration, a known mass of particulate material was weighed on the surface of sieve 32, and the current difference corresponding to different material masses was measured. and the rate of change corresponding to different release rates. The least squares method was used to fit the data. and .

[0141] The calibration experiment was conducted at room temperature (20-30℃) and with a material particle size range of 1-15mm. Each material was repeated at least three times, and the average value of the fitting coefficient was taken.

[0142] The algorithm for determining the expected capacity margin in step S2:

[0143] The control feeding component 5 performs at least two reciprocating micro-displacements while maintaining material reception and with the bottom closed; the amplitude of the reciprocating micro-displacement is 1-5mm, and the speed is 5-20mm / s.

[0144] During each reciprocating micro-displacement process, the controller records the driving load of the actuator that drives the feeding component 5 to move; the driving load is the driving force or driving pressure of the push rod 55.

[0145] The difference in driving load between two adjacent reciprocating micro-displacements is calculated using the following formula:

[0146] ;

[0147] in, For the first Driven by a reciprocating micro-displacement load. For the first Driven by a reciprocating micro-displacement load.

[0148] when When the value is large and shows an increasing trend, it indicates that the material filling degree inside the feeding component 5 is high, and the remaining capacity space is limited; when When the value is small and shows a decreasing or stable trend, it indicates that the material filling degree inside the feeding component 5 is low and the remaining capacity space is large.

[0149] The driving load of each reciprocating micro-displacement is used to characterize the current filling degree, and the difference in driving load and its changing trend are used to correct the current filling degree. The filler correction factor is used to address the difference in drive load.

[0150] coefficient The calibration was obtained through preliminary experiments; during calibration, the driving load corresponding to different filling degrees was weighed in the feeding assembly 5. The least squares method was used to fit the data. .

[0151] Calculation of expected cumulative release and expected capacity:

[0152] The estimated cumulative release amount is determined based on the difference in driving information, the absolute value of the rate of change of the difference, and the sealing time; the estimated cumulative release amount Determine by the following formula:

[0153] ;

[0154] in, This is the conversion factor between current difference and material quantity. This is the correction factor for the rate of change. The sealing time required for the feeding component 5 to complete sealing.

[0155] The absolute value of the rate of change of the difference is used to characterize the release rate of residual material; the larger the absolute value, the faster the residual material is released.

[0156] The expected capacity of the feeding component 5 is determined based on the current filling level and the target filling amount; expected capacity. Determine by the following formula:

[0157] ;

[0158] in, The target loading amount for feeding component 5, This represents the current amount of material already filled. This is the conversion factor between the driving load difference and the filling degree.

[0159] Calculate the difference between the projected cumulative release and the projected capacity:

[0160] ;

[0161] when At that time, the cumulative release is expected to exceed the expected capacity; when When the cumulative release is less than the expected capacity, At that time, the two matched perfectly.

[0162] The algorithm for determining the preset matching conditions in step S3:

[0163] The default matching criteria are:

[0164] ;

[0165] in, The preset matching threshold is set according to the particle size and flowability of the particulate material.

[0166] For granular materials with a particle size of 1-5mm and good flowability, The value should be 2-5% of the target charge amount. For granular materials with a particle size of 5-15mm and poor flowability, The value should be 5-10% of the target charge amount.

[0167] when If the expected cumulative release is significantly greater than the expected capacity, reduce the vibration intensity of screening component 3 or suspend screening component 3; the reduction in vibration intensity is related to... The magnitude is directly proportional to the intensity, and the maximum reduction does not exceed 50% of the current vibration intensity.

[0168] when When the expected cumulative release is significantly less than the expected capacity, pulse feeding is controlled on the feeding conveyor belt 1; the duration of pulse feeding... Determine by the following formula:

[0169] ;

[0170] in, The amount of material supplied per unit time by the feeding conveyor belt 1.

[0171] Feed rate per unit time The calibration was obtained through preliminary experiments; during calibration, the feeding conveyor belt 1 was controlled to run at a set speed, the amount of material fed within a set time was collected, weighed, and divided by the time to obtain the final weight. .

[0172] like Figure 7 As shown, the specific procedures for steps S4 to S5 are as follows:

[0173] The algorithm for determining the low flow release state in step S4:

[0174] The criteria for determining a low-flow release state are:

[0175] ;

[0176] in, The threshold value for the current difference. The threshold for the absolute value of the rate of change. This represents the fluctuation range of the current difference within a set time window. This is the threshold for fluctuation amplitude.

[0177] Calculate the current difference within the time window of 2-5 seconds before the current moment. Standard deviation as volatility :

[0178] ;

[0179] in, The number of sampling points within the time window. For the first Current difference at each sampling point This represents the average value of the current difference within the time window.

[0180] When all three conditions above are met, the screening component 3 is determined to be in a low-flow release state.

[0181] threshold , , The determination is based on the flow characteristics of the particulate material; for conventional particulate materials with a particle size of 1-5 mm, Take 2-5% of the no-load current. Take 0.1-0.5 A / s, Take 0.05-0.2A; for larger particles with a diameter of 5-15mm, the threshold should be relaxed by 1.2-1.5 times.

[0182] The threshold setting must ensure that, under low flow release conditions, the cumulative release amount during the sealing period of the feeding component 5 does not exceed 5% of the expected capacity.

[0183] Parameter update algorithm in step S5:

[0184] Update the feeding parameters, vibration parameters, and sealing parameters for subsequent packaging cycles based on the matching process information of this packaging cycle.

[0185] Record the time required from the start of the adjustment to meeting the preset matching conditions during this packaging cycle. The difference between the expected cumulative release and the expected remaining capacity when the preset matching conditions are met. Difference The trajectory of the change and the number of times the vibration intensity of the screening component 3 is adjusted.

[0186] The updates to the feeding parameters include the pulse feeding duration, feeding interval, and feeding speed of the feeding conveyor belt 1.

[0187] The cumulative replenishment amount required to improve the expected cumulative release from a state of being less than the expected capacity to meet the preset matching conditions over the most recent N historical periods is statistically analyzed, and the average value is calculated as the benchmark replenishment amount for the next period.

[0188] The vibration parameters are updated, including the magnitude and rate of decrease in the vibration intensity of the screening component 3.

[0189] When the screening component 3 continues to release a large amount of tail material after meeting the preset matching conditions in several recent historical cycles, the timing for reducing the vibration intensity should be advanced; when the tail material is insufficient and frequent replenishment is required, the timing for reducing the vibration intensity should be delayed or the reduction should be reduced.

[0190] The update of the sealing parameters includes the timing of when the unloading component 5 leaves the receiving position.

[0191] When the packaging volume after sealing is systematically high, advance the timing of the unloading component 5 leaving the receiving position. When the packaging volume after sealing is systematically low, delay the timing; the update range should not exceed 5-10% of the current set value.

[0192] The parameter updates use a moving average filter, and statistics are performed and updated every 5-10 packaging cycles to avoid excessive impact on the parameters from a single abnormal cycle.

[0193] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials, characterized in that, include: Rack (2); The feeding conveyor belt (1) is located on one side of the frame (2) and is used for conveying granular materials; The screening component (3), located on top of the frame (2), is used to receive and screen the granular material output from the feeding conveyor belt (1); The storage hopper (4) is located below the screening assembly (3) and is used to receive the granular material after screening. The feeding assembly (5) is located below the storage hopper (4) and is used to receive granular materials at the receiving position and sequentially close the discharge path of the storage hopper (4) and discharge materials to the packaging box when moving to the discharge position. The conveyor belt (6), located below the unloading assembly (5), is used to transport the packaging box to the unloading position; The controller is connected to the feeding conveyor belt (1), the screening component (3), the unloading component (5) and the conveyor belt (6), respectively. The controller is used to determine the expected cumulative release amount based on the no-load reference drive information of the screening component (3), the actual drive information and the sealing time required for the unloading component (5) to complete the sealing; to determine the expected capacity allowance based on the drive load during the reciprocating micro-displacement process of the unloading component (5); to adjust the pulse feeding state of the feeding conveyor belt (1) and the vibration state of the screening component (3) based on the difference between the two; and to control the unloading component (5) to leave the receiving position when the two meet the preset matching conditions and the screening component (3) is in the low flow release state.

2. The intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials according to claim 1, characterized in that: The screening assembly (3) includes several columns (31) bolted to the top of the frame (2), with a housing (36) at the top of the columns (31) and a screen (32) at the bottom of the housing (36).

3. The intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials according to claim 2, characterized in that: Several springs (33) are provided on both sides of the bottom of the screen (32), a transmission wheel (34) is provided at the bottom of the screen (32), and a drive motor (35) is provided at the top of the frame (2). The drive motor (35) is connected to the transmission wheel (34) in a transmission connection.

4. The intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials according to claim 1, characterized in that: The feeding assembly (5) includes a conveying pipe (51) disposed at the bottom of the storage hopper (4), a fixing plate (52) is sleeved on the outer wall of the conveying pipe (51), and a support plate (53) is disposed at the bottom of the fixing plate (52).

5. An intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials according to claim 4, characterized in that: The top of the support plate (53) is provided with a feeding tank (54), and the bottom of the feeding tank (54) is hinged to a movable bottom door. A push rod (55) is provided on one side of the fixed plate (52). The push rod (55) is located on the side of the fixed plate (52) away from the feeding tank (54) and is connected to the feeding tank (54).

6. A control method for intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials, based on the intermittent anti-pinch feeding conveyor device for quantitative packaging of granular materials as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Obtain the no-load reference drive information and actual drive information of the screening component, and determine the expected cumulative release amount within the sealing time based on the difference between the two, the rate of change of the difference, and the sealing time required for the feeding component to complete the sealing. S2. When the feeding component is in the position of receiving material and the bottom is closed, it performs at least two reciprocating micro-displacements with a preset stroke and a preset speed. Based on the driving load of each micro-displacement and the difference between adjacent driving loads, the expected capacity is determined. S3. When the difference between the expected cumulative release amount and the expected remaining capacity is greater than the upper limit of the preset matching range, reduce the vibration intensity of the screening component or pause the screening component; when the difference is less than the lower limit of the preset matching range, control the feeding conveyor belt to perform pulse feeding. S4. When the expected cumulative release amount and the expected remaining capacity meet the preset matching conditions, and the absolute value of the difference in driving information of the screening component, the rate of change of the difference, and the fluctuation amplitude are all lower than the corresponding threshold, control the feeding component to leave the receiving position. S5. Control the material feeding component to close the discharge path of the storage hopper and unload the material into the packaging box during the movement process, and update the feeding parameters, vibration parameters and sealing parameters of the subsequent packaging cycle according to the matching process of this packaging cycle.

7. The control method for intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials according to claim 6, characterized in that: In step S1, the no-load reference drive information is the reference current of the drive motor when the screening component is running under no-load conditions, and the actual drive information is the actual current of the drive motor during the screening process. The amount of residual material in the screening component is determined based on the difference between the actual current and the reference current. The release rate of the residual material is determined based on the rate of change of the difference. The expected cumulative release amount is determined based on the amount of residual material, the release rate, and the sealing time.

8. A control method for intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials according to claim 6, characterized in that: In step S2, the stroke of the reciprocating micro-displacement is 1-5mm, and the speed is 5-20mm / s; during each reciprocating micro-displacement, the drive load of the actuator that drives the material feeding component to move is obtained, the current filling degree is determined according to each drive load, and the current filling degree is converted into the current filling amount; the expected capacity is determined according to the difference between the target filling amount and the current filling amount.

9. A control method for intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials according to claim 6, characterized in that: In step S3, when the difference between the expected cumulative release amount and the expected remaining capacity is greater than the upper limit of the preset matching range, the vibration intensity of the screening component is reduced or the screening component is paused; when the difference is less than the lower limit of the preset matching range, the feeding conveyor belt is controlled to perform pulse feeding. When the difference is within a preset matching range, the preset matching condition is determined to be met.

10. A control method for intermittent anti-pinch feeding conveyor for quantitative packaging of granular materials according to claim 6, characterized in that: In step S4, the difference in driving information of the screening component is the difference between the actual driving information and the no-load reference driving information; when the absolute value of the driving information difference, the rate of change of the difference, and the fluctuation amplitude are all lower than the corresponding threshold, it is determined that the screening component is in a low flow release state, and the feeding component is controlled to leave the receiving position.

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